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Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/klassert/ipsec...
[linux-2.6-block.git] / net / ipv6 / addrconf.c
CommitLineData
1da177e4
LT		 1/*
2 * IPv6 Address [auto]configuration
3 * Linux INET6 implementation
4 *
5 * Authors:
1ab1457c 6 * Pedro Roque <roque@di.fc.ul.pt>
1da177e4
LT		 7 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
8 *
1da177e4
LT		 9 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License
11 * as published by the Free Software Foundation; either version
12 * 2 of the License, or (at your option) any later version.
13 */
14
15/*
16 * Changes:
17 *
18 * Janos Farkas : delete timer on ifdown
19 * <chexum@bankinf.banki.hu>
20 * Andi Kleen : kill double kfree on module
21 * unload.
22 * Maciej W. Rozycki : FDDI support
23 * sekiya@USAGI : Don't send too many RS
24 * packets.
25 * yoshfuji@USAGI : Fixed interval between DAD
26 * packets.
27 * YOSHIFUJI Hideaki @USAGI : improved accuracy of
28 * address validation timer.
29 * YOSHIFUJI Hideaki @USAGI : Privacy Extensions (RFC3041)
30 * support.
31 * Yuji SEKIYA @USAGI : Don't assign a same IPv6
32 * address on a same interface.
33 * YOSHIFUJI Hideaki @USAGI : ARCnet support
34 * YOSHIFUJI Hideaki @USAGI : convert /proc/net/if_inet6 to
35 * seq_file.
b1cacb68
YH		 36 * YOSHIFUJI Hideaki @USAGI : improved source address
37 * selection; consider scope,
38 * status etc.
1da177e4
LT		 39 */
40
f3213831
JP		 41#define pr_fmt(fmt) "IPv6: " fmt
42
1da177e4
LT		 43#include <linux/errno.h>
44#include <linux/types.h>
a0bffffc 45#include <linux/kernel.h>
1da177e4
LT		 46#include <linux/socket.h>
47#include <linux/sockios.h>
1da177e4 48#include <linux/net.h>
3d1bec99 49#include <linux/inet.h>
1da177e4
LT		 50#include <linux/in6.h>
51#include <linux/netdevice.h>
1823730f 52#include <linux/if_addr.h>
1da177e4
LT		 53#include <linux/if_arp.h>
54#include <linux/if_arcnet.h>
55#include <linux/if_infiniband.h>
56#include <linux/route.h>
57#include <linux/inetdevice.h>
58#include <linux/init.h>
5a0e3ad6 59#include <linux/slab.h>
1da177e4
LT		 60#ifdef CONFIG_SYSCTL
61#include <linux/sysctl.h>
62#endif
4fc268d2 63#include <linux/capability.h>
1da177e4
LT		 64#include <linux/delay.h>
65#include <linux/notifier.h>
543537bd 66#include <linux/string.h>
ddbe5032 67#include <linux/hash.h>
1da177e4 68
457c4cbc 69#include <net/net_namespace.h>
1da177e4
LT		 70#include <net/sock.h>
71#include <net/snmp.h>
72
5241c2d7 73#include <net/6lowpan.h>
cb6bf355 74#include <net/firewire.h>
1da177e4
LT		 75#include <net/ipv6.h>
76#include <net/protocol.h>
77#include <net/ndisc.h>
78#include <net/ip6_route.h>
79#include <net/addrconf.h>
80#include <net/tcp.h>
81#include <net/ip.h>
5d620266 82#include <net/netlink.h>
f24e3d65 83#include <net/pkt_sched.h>
ca254490 84#include <net/l3mdev.h>
1da177e4
LT		 85#include <linux/if_tunnel.h>
86#include <linux/rtnetlink.h>
f3a1bfb1 87#include <linux/netconf.h>
1da177e4 88#include <linux/random.h>
e21e8467 89#include <linux/uaccess.h>
7f7d9a6b 90#include <asm/unaligned.h>
1da177e4
LT		 91
92#include <linux/proc_fs.h>
93#include <linux/seq_file.h>
bc3b2d7f 94#include <linux/export.h>
1da177e4
LT		 95
96/* Set to 3 to get tracing... */
97#define ACONF_DEBUG 2
98
99#if ACONF_DEBUG >= 3
ba3542e1 100#define ADBG(fmt, ...) printk(fmt, ##__VA_ARGS__)
1da177e4 101#else
ba3542e1 102#define ADBG(fmt, ...) do { if (0) printk(fmt, ##__VA_ARGS__); } while (0)
1da177e4
LT		 103#endif
104
105#define INFINITY_LIFE_TIME 0xFFFFFFFF
18a31e1e 106
3d1bec99
HFS		 107#define IPV6_MAX_STRLEN \
108 sizeof("ffff:ffff:ffff:ffff:ffff:ffff:255.255.255.255")
109
18a31e1e
TG		 110static inline u32 cstamp_delta(unsigned long cstamp)
111{
112 return (cstamp - INITIAL_JIFFIES) * 100UL / HZ;
113}
1da177e4 114
bd11f074
MŻ		 115static inline s32 rfc3315_s14_backoff_init(s32 irt)
116{
117 /* multiply 'initial retransmission time' by 0.9 .. 1.1 */
118 u64 tmp = (900000 + prandom_u32() % 200001) * (u64)irt;
119 do_div(tmp, 1000000);
120 return (s32)tmp;
121}
122
123static inline s32 rfc3315_s14_backoff_update(s32 rt, s32 mrt)
124{
125 /* multiply 'retransmission timeout' by 1.9 .. 2.1 */
126 u64 tmp = (1900000 + prandom_u32() % 200001) * (u64)rt;
127 do_div(tmp, 1000000);
128 if ((s32)tmp > mrt) {
129 /* multiply 'maximum retransmission time' by 0.9 .. 1.1 */
130 tmp = (900000 + prandom_u32() % 200001) * (u64)mrt;
131 do_div(tmp, 1000000);
132 }
133 return (s32)tmp;
134}
135
1da177e4 136#ifdef CONFIG_SYSCTL
a317a2f1 137static int addrconf_sysctl_register(struct inet6_dev *idev);
408c4768
PE		 138static void addrconf_sysctl_unregister(struct inet6_dev *idev);
139#else
a317a2f1 140static inline int addrconf_sysctl_register(struct inet6_dev *idev)
408c4768 141{
a317a2f1 142 return 0;
408c4768
PE		 143}
144
145static inline void addrconf_sysctl_unregister(struct inet6_dev *idev)
146{
147}
1da177e4
LT		 148#endif
149
9d6280da
JB		 150static void ipv6_regen_rndid(struct inet6_dev *idev);
151static void ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
1da177e4 152
1b34be74 153static int ipv6_generate_eui64(u8 *eui, struct net_device *dev);
1da177e4 154static int ipv6_count_addresses(struct inet6_dev *idev);
622c81d5
HFS		 155static int ipv6_generate_stable_address(struct in6_addr *addr,
156 u8 dad_count,
157 const struct inet6_dev *idev);
1da177e4
LT		 158
159/*
160 * Configured unicast address hash table
161 */
c2e21293 162static struct hlist_head inet6_addr_lst[IN6_ADDR_HSIZE];
5c578aed 163static DEFINE_SPINLOCK(addrconf_hash_lock);
1da177e4 164
c15b1cca
HFS		 165static void addrconf_verify(void);
166static void addrconf_verify_rtnl(void);
167static void addrconf_verify_work(struct work_struct *);
1da177e4 168
c15b1cca
HFS		 169static struct workqueue_struct *addrconf_wq;
170static DECLARE_DELAYED_WORK(addr_chk_work, addrconf_verify_work);
1da177e4
LT		 171
172static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
173static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
174
93d9b7d7
JP		 175static void addrconf_type_change(struct net_device *dev,
176 unsigned long event);
1da177e4
LT		 177static int addrconf_ifdown(struct net_device *dev, int how);
178
21caa662
RK		 179static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
180 int plen,
181 const struct net_device *dev,
182 u32 flags, u32 noflags);
183
cf22f9a2 184static void addrconf_dad_start(struct inet6_ifaddr *ifp);
c15b1cca 185static void addrconf_dad_work(struct work_struct *w);
764d3be6 186static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id);
c5e33bdd 187static void addrconf_dad_run(struct inet6_dev *idev);
1da177e4
LT		 188static void addrconf_rs_timer(unsigned long data);
189static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
190static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
191
1ab1457c 192static void inet6_prefix_notify(int event, struct inet6_dev *idev,
1da177e4 193 struct prefix_info *pinfo);
3e81c6da
DM		 194static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
195 struct net_device *dev);
1da177e4 196
888c848e 197static struct ipv6_devconf ipv6_devconf __read_mostly = {
1da177e4
LT		 198 .forwarding = 0,
199 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
200 .mtu6 = IPV6_MIN_MTU,
201 .accept_ra = 1,
202 .accept_redirects = 1,
203 .autoconf = 1,
204 .force_mld_version = 0,
fc4eba58
HFS		 205 .mldv1_unsolicited_report_interval = 10 * HZ,
206 .mldv2_unsolicited_report_interval = HZ,
1da177e4
LT		 207 .dad_transmits = 1,
208 .rtr_solicits = MAX_RTR_SOLICITATIONS,
209 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
bd11f074 210 .rtr_solicit_max_interval = RTR_SOLICITATION_MAX_INTERVAL,
1da177e4 211 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
67ba4152 212 .use_tempaddr = 0,
1da177e4
LT		 213 .temp_valid_lft = TEMP_VALID_LIFETIME,
214 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
215 .regen_max_retry = REGEN_MAX_RETRY,
216 .max_desync_factor = MAX_DESYNC_FACTOR,
1da177e4 217 .max_addresses = IPV6_MAX_ADDRESSES,
65f5c7c1 218 .accept_ra_defrtr = 1,
d9333196 219 .accept_ra_from_local = 0,
8013d1d7 220 .accept_ra_min_hop_limit= 1,
c4fd30eb 221 .accept_ra_pinfo = 1,
930d6ff2
YH		 222#ifdef CONFIG_IPV6_ROUTER_PREF
223 .accept_ra_rtr_pref = 1,
52e16356 224 .rtr_probe_interval = 60 * HZ,
09c884d4
YH		 225#ifdef CONFIG_IPV6_ROUTE_INFO
226 .accept_ra_rt_info_max_plen = 0,
227#endif
930d6ff2 228#endif
fbea49e1 229 .proxy_ndp = 0,
0bcbc926 230 .accept_source_route = 0, /* we do not accept RH0 by default. */
778d80be 231 .disable_ipv6 = 0,
1b34be74 232 .accept_dad = 1,
b800c3b9 233 .suppress_frag_ndisc = 1,
c2943f14 234 .accept_ra_mtu = 1,
3d1bec99
HFS		 235 .stable_secret = {
236 .initialized = false,
3985e8a3
EK		 237 },
238 .use_oif_addrs_only = 0,
35103d11 239 .ignore_routes_with_linkdown = 0,
f1705ec1 240 .keep_addr_on_down = 0,
1ababeba 241 .seg6_enabled = 0,
bf355b8d
DL		 242#ifdef CONFIG_IPV6_SEG6_HMAC
243 .seg6_require_hmac = 0,
244#endif
adc176c5 245 .enhanced_dad = 1,
d35a00b8 246 .addr_gen_mode = IN6_ADDR_GEN_MODE_EUI64,
1da177e4
LT		 247};
248
ab32ea5d 249static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
1da177e4
LT		 250 .forwarding = 0,
251 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
252 .mtu6 = IPV6_MIN_MTU,
253 .accept_ra = 1,
254 .accept_redirects = 1,
255 .autoconf = 1,
fc4eba58
HFS		 256 .force_mld_version = 0,
257 .mldv1_unsolicited_report_interval = 10 * HZ,
258 .mldv2_unsolicited_report_interval = HZ,
1da177e4
LT		 259 .dad_transmits = 1,
260 .rtr_solicits = MAX_RTR_SOLICITATIONS,
261 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
bd11f074 262 .rtr_solicit_max_interval = RTR_SOLICITATION_MAX_INTERVAL,
1da177e4 263 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
1da177e4
LT		 264 .use_tempaddr = 0,
265 .temp_valid_lft = TEMP_VALID_LIFETIME,
266 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
267 .regen_max_retry = REGEN_MAX_RETRY,
268 .max_desync_factor = MAX_DESYNC_FACTOR,
1da177e4 269 .max_addresses = IPV6_MAX_ADDRESSES,
65f5c7c1 270 .accept_ra_defrtr = 1,
d9333196 271 .accept_ra_from_local = 0,
8013d1d7 272 .accept_ra_min_hop_limit= 1,
c4fd30eb 273 .accept_ra_pinfo = 1,
930d6ff2
YH		 274#ifdef CONFIG_IPV6_ROUTER_PREF
275 .accept_ra_rtr_pref = 1,
52e16356 276 .rtr_probe_interval = 60 * HZ,
09c884d4
YH		 277#ifdef CONFIG_IPV6_ROUTE_INFO
278 .accept_ra_rt_info_max_plen = 0,
279#endif
930d6ff2 280#endif
fbea49e1 281 .proxy_ndp = 0,
0bcbc926 282 .accept_source_route = 0, /* we do not accept RH0 by default. */
778d80be 283 .disable_ipv6 = 0,
1b34be74 284 .accept_dad = 1,
b800c3b9 285 .suppress_frag_ndisc = 1,
c2943f14 286 .accept_ra_mtu = 1,
3d1bec99
HFS		 287 .stable_secret = {
288 .initialized = false,
289 },
3985e8a3 290 .use_oif_addrs_only = 0,
35103d11 291 .ignore_routes_with_linkdown = 0,
f1705ec1 292 .keep_addr_on_down = 0,
1ababeba 293 .seg6_enabled = 0,
bf355b8d
DL		 294#ifdef CONFIG_IPV6_SEG6_HMAC
295 .seg6_require_hmac = 0,
296#endif
adc176c5 297 .enhanced_dad = 1,
d35a00b8 298 .addr_gen_mode = IN6_ADDR_GEN_MODE_EUI64,
1da177e4
LT		 299};
300
f24e3d65 301/* Check if a valid qdisc is available */
05297949 302static inline bool addrconf_qdisc_ok(const struct net_device *dev)
f24e3d65 303{
05297949 304 return !qdisc_tx_is_noop(dev);
f24e3d65
MC		 305}
306
b7b1bfce 307static void addrconf_del_rs_timer(struct inet6_dev *idev)
1da177e4 308{
b7b1bfce
HFS		 309 if (del_timer(&idev->rs_timer))
310 __in6_dev_put(idev);
311}
312
c15b1cca 313static void addrconf_del_dad_work(struct inet6_ifaddr *ifp)
b7b1bfce 314{
c15b1cca 315 if (cancel_delayed_work(&ifp->dad_work))
1da177e4
LT		 316 __in6_ifa_put(ifp);
317}
318
b7b1bfce
HFS		 319static void addrconf_mod_rs_timer(struct inet6_dev *idev,
320 unsigned long when)
321{
322 if (!timer_pending(&idev->rs_timer))
323 in6_dev_hold(idev);
324 mod_timer(&idev->rs_timer, jiffies + when);
325}
1da177e4 326
c15b1cca
HFS		 327static void addrconf_mod_dad_work(struct inet6_ifaddr *ifp,
328 unsigned long delay)
1da177e4 329{
c15b1cca 330 if (!delayed_work_pending(&ifp->dad_work))
1da177e4 331 in6_ifa_hold(ifp);
c15b1cca 332 mod_delayed_work(addrconf_wq, &ifp->dad_work, delay);
1da177e4
LT		 333}
334
7f7d9a6b
HX		 335static int snmp6_alloc_dev(struct inet6_dev *idev)
336{
827da44c
JS		 337 int i;
338
698365fa
WC		 339 idev->stats.ipv6 = alloc_percpu(struct ipstats_mib);
340 if (!idev->stats.ipv6)
7f7d9a6b 341 goto err_ip;
827da44c
JS		 342
343 for_each_possible_cpu(i) {
344 struct ipstats_mib *addrconf_stats;
698365fa 345 addrconf_stats = per_cpu_ptr(idev->stats.ipv6, i);
827da44c 346 u64_stats_init(&addrconf_stats->syncp);
827da44c
JS		 347 }
348
349
be281e55
ED		 350 idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device),
351 GFP_KERNEL);
352 if (!idev->stats.icmpv6dev)
7f7d9a6b 353 goto err_icmp;
be281e55
ED		 354 idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device),
355 GFP_KERNEL);
356 if (!idev->stats.icmpv6msgdev)
14878f75 357 goto err_icmpmsg;
7f7d9a6b
HX		 358
359 return 0;
360
14878f75 361err_icmpmsg:
be281e55 362 kfree(idev->stats.icmpv6dev);
7f7d9a6b 363err_icmp:
698365fa 364 free_percpu(idev->stats.ipv6);
7f7d9a6b 365err_ip:
aaf70ec7 366 return -ENOMEM;
7f7d9a6b
HX		 367}
368
8e5e8f30 369static struct inet6_dev *ipv6_add_dev(struct net_device *dev)
1da177e4
LT		 370{
371 struct inet6_dev *ndev;
a317a2f1 372 int err = -ENOMEM;
1da177e4
LT		 373
374 ASSERT_RTNL();
375
376 if (dev->mtu < IPV6_MIN_MTU)
a317a2f1 377 return ERR_PTR(-EINVAL);
1da177e4 378
1ab1457c 379 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
63159f29 380 if (!ndev)
a317a2f1 381 return ERR_PTR(err);
322f74a4
IO		 382
383 rwlock_init(&ndev->lock);
384 ndev->dev = dev;
502a2ffd 385 INIT_LIST_HEAD(&ndev->addr_list);
b7b1bfce
HFS		 386 setup_timer(&ndev->rs_timer, addrconf_rs_timer,
387 (unsigned long)ndev);
c346dca1 388 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf));
9b29c696
HFS		 389
390 if (ndev->cnf.stable_secret.initialized)
d35a00b8 391 ndev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
9b29c696 392 else
d35a00b8 393 ndev->cnf.addr_gen_mode = ipv6_devconf_dflt.addr_gen_mode;
9b29c696 394
322f74a4 395 ndev->cnf.mtu6 = dev->mtu;
322f74a4 396 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
63159f29 397 if (!ndev->nd_parms) {
322f74a4 398 kfree(ndev);
a317a2f1 399 return ERR_PTR(err);
322f74a4 400 }
0187bdfb
BH		 401 if (ndev->cnf.forwarding)
402 dev_disable_lro(dev);
322f74a4
IO		 403 /* We refer to the device */
404 dev_hold(dev);
1da177e4 405
322f74a4 406 if (snmp6_alloc_dev(ndev) < 0) {
ba3542e1 407 ADBG(KERN_WARNING
f3213831 408 "%s: cannot allocate memory for statistics; dev=%s.\n",
ba3542e1 409 __func__, dev->name);
322f74a4 410 neigh_parms_release(&nd_tbl, ndev->nd_parms);
8603e33d
RL		 411 dev_put(dev);
412 kfree(ndev);
a317a2f1 413 return ERR_PTR(err);
322f74a4 414 }
1da177e4 415
322f74a4 416 if (snmp6_register_dev(ndev) < 0) {
ba3542e1 417 ADBG(KERN_WARNING
f3213831 418 "%s: cannot create /proc/net/dev_snmp6/%s\n",
ba3542e1 419 __func__, dev->name);
a317a2f1 420 goto err_release;
322f74a4
IO		 421 }
422
9d6280da 423 /* One reference from device. */
322f74a4 424 in6_dev_hold(ndev);
1da177e4 425
1b34be74
YH		 426 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
427 ndev->cnf.accept_dad = -1;
428
07a93626 429#if IS_ENABLED(CONFIG_IPV6_SIT)
b077d7ab 430 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
f3213831 431 pr_info("%s: Disabled Multicast RS\n", dev->name);
b077d7ab
YH		 432 ndev->cnf.rtr_solicits = 0;
433 }
434#endif
435
372e6c8f 436 INIT_LIST_HEAD(&ndev->tempaddr_list);
76506a98 437 ndev->desync_factor = U32_MAX;
322f74a4
IO		 438 if ((dev->flags&IFF_LOOPBACK) ||
439 dev->type == ARPHRD_TUNNEL ||
9625ed72 440 dev->type == ARPHRD_TUNNEL6 ||
0be669bb 441 dev->type == ARPHRD_SIT ||
0be669bb 442 dev->type == ARPHRD_NONE) {
322f74a4 443 ndev->cnf.use_tempaddr = -1;
9d6280da
JB		 444 } else
445 ipv6_regen_rndid(ndev);
5d9efa7e 446
914faa14 447 ndev->token = in6addr_any;
1da177e4 448
f24e3d65 449 if (netif_running(dev) && addrconf_qdisc_ok(dev))
53aadcc9
HX		 450 ndev->if_flags |= IF_READY;
451
322f74a4
IO		 452 ipv6_mc_init_dev(ndev);
453 ndev->tstamp = jiffies;
a317a2f1
WC		 454 err = addrconf_sysctl_register(ndev);
455 if (err) {
456 ipv6_mc_destroy_dev(ndev);
2a189f9e 457 snmp6_unregister_dev(ndev);
a317a2f1
WC		 458 goto err_release;
459 }
30c4cf57 460 /* protected by rtnl_lock */
cf778b00 461 rcu_assign_pointer(dev->ip6_ptr, ndev);
d88ae4cc 462
2c5e8933
HFS		 463 /* Join interface-local all-node multicast group */
464 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allnodes);
465
d88ae4cc 466 /* Join all-node multicast group */
f3ee4010 467 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);
d88ae4cc 468
d6ddef9e 469 /* Join all-router multicast group if forwarding is set */
8b2aaede 470 if (ndev->cnf.forwarding && (dev->flags & IFF_MULTICAST))
d6ddef9e
LW		 471 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
472
1da177e4 473 return ndev;
a317a2f1
WC		 474
475err_release:
476 neigh_parms_release(&nd_tbl, ndev->nd_parms);
477 ndev->dead = 1;
478 in6_dev_finish_destroy(ndev);
479 return ERR_PTR(err);
1da177e4
LT		 480}
481
8e5e8f30 482static struct inet6_dev *ipv6_find_idev(struct net_device *dev)
1da177e4
LT		 483{
484 struct inet6_dev *idev;
485
486 ASSERT_RTNL();
487
e21e8467
SH		 488 idev = __in6_dev_get(dev);
489 if (!idev) {
490 idev = ipv6_add_dev(dev);
a317a2f1 491 if (IS_ERR(idev))
1da177e4
LT		 492 return NULL;
493 }
c5e33bdd 494
1da177e4
LT		 495 if (dev->flags&IFF_UP)
496 ipv6_mc_up(idev);
497 return idev;
498}
499
f3a1bfb1
ND		 500static int inet6_netconf_msgsize_devconf(int type)
501{
502 int size = NLMSG_ALIGN(sizeof(struct netconfmsg))
503 + nla_total_size(4); /* NETCONFA_IFINDEX */
136ba622 504 bool all = false;
f3a1bfb1 505
136ba622
ZS		 506 if (type == NETCONFA_ALL)
507 all = true;
508
509 if (all || type == NETCONFA_FORWARDING)
f3a1bfb1 510 size += nla_total_size(4);
b1afce95 511#ifdef CONFIG_IPV6_MROUTE
136ba622 512 if (all || type == NETCONFA_MC_FORWARDING)
d67b8c61 513 size += nla_total_size(4);
b1afce95 514#endif
136ba622 515 if (all || type == NETCONFA_PROXY_NEIGH)
c92d5491 516 size += nla_total_size(4);
f3a1bfb1 517
136ba622 518 if (all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN)
35103d11
AG		 519 size += nla_total_size(4);
520
f3a1bfb1
ND		 521 return size;
522}
523
524static int inet6_netconf_fill_devconf(struct sk_buff *skb, int ifindex,
525 struct ipv6_devconf *devconf, u32 portid,
526 u32 seq, int event, unsigned int flags,
527 int type)
528{
529 struct nlmsghdr *nlh;
530 struct netconfmsg *ncm;
136ba622 531 bool all = false;
f3a1bfb1
ND		 532
533 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg),
534 flags);
63159f29 535 if (!nlh)
f3a1bfb1
ND		 536 return -EMSGSIZE;
537
136ba622
ZS		 538 if (type == NETCONFA_ALL)
539 all = true;
540
f3a1bfb1
ND		 541 ncm = nlmsg_data(nlh);
542 ncm->ncm_family = AF_INET6;
543
544 if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0)
545 goto nla_put_failure;
546
136ba622 547 if ((all || type == NETCONFA_FORWARDING) &&
f3a1bfb1
ND		 548 nla_put_s32(skb, NETCONFA_FORWARDING, devconf->forwarding) < 0)
549 goto nla_put_failure;
b1afce95 550#ifdef CONFIG_IPV6_MROUTE
136ba622 551 if ((all || type == NETCONFA_MC_FORWARDING) &&
d67b8c61
ND		 552 nla_put_s32(skb, NETCONFA_MC_FORWARDING,
553 devconf->mc_forwarding) < 0)
554 goto nla_put_failure;
b1afce95 555#endif
136ba622 556 if ((all || type == NETCONFA_PROXY_NEIGH) &&
c92d5491 557 nla_put_s32(skb, NETCONFA_PROXY_NEIGH, devconf->proxy_ndp) < 0)
558 goto nla_put_failure;
559
136ba622 560 if ((all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN) &&
35103d11
AG		 561 nla_put_s32(skb, NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
562 devconf->ignore_routes_with_linkdown) < 0)
563 goto nla_put_failure;
564
053c095a
JB		 565 nlmsg_end(skb, nlh);
566 return 0;
f3a1bfb1
ND		 567
568nla_put_failure:
569 nlmsg_cancel(skb, nlh);
570 return -EMSGSIZE;
571}
572
d67b8c61
ND		 573void inet6_netconf_notify_devconf(struct net *net, int type, int ifindex,
574 struct ipv6_devconf *devconf)
f3a1bfb1
ND		 575{
576 struct sk_buff *skb;
577 int err = -ENOBUFS;
578
927265bc 579 skb = nlmsg_new(inet6_netconf_msgsize_devconf(type), GFP_KERNEL);
63159f29 580 if (!skb)
f3a1bfb1
ND		 581 goto errout;
582
583 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 0, 0,
584 RTM_NEWNETCONF, 0, type);
585 if (err < 0) {
586 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
587 WARN_ON(err == -EMSGSIZE);
588 kfree_skb(skb);
589 goto errout;
590 }
927265bc 591 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_NETCONF, NULL, GFP_KERNEL);
f3a1bfb1
ND		 592 return;
593errout:
bd779028 594 rtnl_set_sk_err(net, RTNLGRP_IPV6_NETCONF, err);
f3a1bfb1
ND		 595}
596
76f8f6cb
ND		 597static const struct nla_policy devconf_ipv6_policy[NETCONFA_MAX+1] = {
598 [NETCONFA_IFINDEX] = { .len = sizeof(int) },
599 [NETCONFA_FORWARDING] = { .len = sizeof(int) },
c92d5491 600 [NETCONFA_PROXY_NEIGH] = { .len = sizeof(int) },
35103d11 601 [NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN] = { .len = sizeof(int) },
76f8f6cb
ND		 602};
603
604static int inet6_netconf_get_devconf(struct sk_buff *in_skb,
661d2967 605 struct nlmsghdr *nlh)
76f8f6cb
ND		 606{
607 struct net *net = sock_net(in_skb->sk);
608 struct nlattr *tb[NETCONFA_MAX+1];
609 struct netconfmsg *ncm;
610 struct sk_buff *skb;
611 struct ipv6_devconf *devconf;
612 struct inet6_dev *in6_dev;
613 struct net_device *dev;
614 int ifindex;
615 int err;
616
617 err = nlmsg_parse(nlh, sizeof(*ncm), tb, NETCONFA_MAX,
618 devconf_ipv6_policy);
619 if (err < 0)
620 goto errout;
621
a97eb33f 622 err = -EINVAL;
76f8f6cb
ND		 623 if (!tb[NETCONFA_IFINDEX])
624 goto errout;
625
626 ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]);
627 switch (ifindex) {
628 case NETCONFA_IFINDEX_ALL:
629 devconf = net->ipv6.devconf_all;
630 break;
631 case NETCONFA_IFINDEX_DEFAULT:
632 devconf = net->ipv6.devconf_dflt;
633 break;
634 default:
635 dev = __dev_get_by_index(net, ifindex);
63159f29 636 if (!dev)
76f8f6cb
ND		 637 goto errout;
638 in6_dev = __in6_dev_get(dev);
63159f29 639 if (!in6_dev)
76f8f6cb
ND		 640 goto errout;
641 devconf = &in6_dev->cnf;
642 break;
643 }
644
645 err = -ENOBUFS;
136ba622 646 skb = nlmsg_new(inet6_netconf_msgsize_devconf(NETCONFA_ALL), GFP_ATOMIC);
63159f29 647 if (!skb)
76f8f6cb
ND		 648 goto errout;
649
650 err = inet6_netconf_fill_devconf(skb, ifindex, devconf,
651 NETLINK_CB(in_skb).portid,
652 nlh->nlmsg_seq, RTM_NEWNETCONF, 0,
136ba622 653 NETCONFA_ALL);
76f8f6cb
ND		 654 if (err < 0) {
655 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
656 WARN_ON(err == -EMSGSIZE);
657 kfree_skb(skb);
658 goto errout;
659 }
660 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
661errout:
662 return err;
663}
664
7a674200
ND		 665static int inet6_netconf_dump_devconf(struct sk_buff *skb,
666 struct netlink_callback *cb)
667{
668 struct net *net = sock_net(skb->sk);
669 int h, s_h;
670 int idx, s_idx;
671 struct net_device *dev;
672 struct inet6_dev *idev;
673 struct hlist_head *head;
674
675 s_h = cb->args[0];
676 s_idx = idx = cb->args[1];
677
678 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
679 idx = 0;
680 head = &net->dev_index_head[h];
681 rcu_read_lock();
63998ac2
ND		 682 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^
683 net->dev_base_seq;
7a674200
ND		 684 hlist_for_each_entry_rcu(dev, head, index_hlist) {
685 if (idx < s_idx)
686 goto cont;
687 idev = __in6_dev_get(dev);
688 if (!idev)
689 goto cont;
690
691 if (inet6_netconf_fill_devconf(skb, dev->ifindex,
692 &idev->cnf,
693 NETLINK_CB(cb->skb).portid,
694 cb->nlh->nlmsg_seq,
695 RTM_NEWNETCONF,
696 NLM_F_MULTI,
136ba622 697 NETCONFA_ALL) < 0) {
7a674200
ND		 698 rcu_read_unlock();
699 goto done;
700 }
63998ac2 701 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
7a674200
ND		 702cont:
703 idx++;
704 }
705 rcu_read_unlock();
706 }
707 if (h == NETDEV_HASHENTRIES) {
708 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL,
709 net->ipv6.devconf_all,
710 NETLINK_CB(cb->skb).portid,
711 cb->nlh->nlmsg_seq,
712 RTM_NEWNETCONF, NLM_F_MULTI,
136ba622 713 NETCONFA_ALL) < 0)
7a674200
ND		 714 goto done;
715 else
716 h++;
717 }
718 if (h == NETDEV_HASHENTRIES + 1) {
719 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT,
720 net->ipv6.devconf_dflt,
721 NETLINK_CB(cb->skb).portid,
722 cb->nlh->nlmsg_seq,
723 RTM_NEWNETCONF, NLM_F_MULTI,
136ba622 724 NETCONFA_ALL) < 0)
7a674200
ND		 725 goto done;
726 else
727 h++;
728 }
729done:
730 cb->args[0] = h;
731 cb->args[1] = idx;
732
733 return skb->len;
734}
735
1da177e4
LT		 736#ifdef CONFIG_SYSCTL
737static void dev_forward_change(struct inet6_dev *idev)
738{
739 struct net_device *dev;
740 struct inet6_ifaddr *ifa;
1da177e4
LT		 741
742 if (!idev)
743 return;
744 dev = idev->dev;
0187bdfb
BH		 745 if (idev->cnf.forwarding)
746 dev_disable_lro(dev);
1a940835 747 if (dev->flags & IFF_MULTICAST) {
2c5e8933 748 if (idev->cnf.forwarding) {
f3ee4010 749 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
2c5e8933
HFS		 750 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allrouters);
751 ipv6_dev_mc_inc(dev, &in6addr_sitelocal_allrouters);
752 } else {
f3ee4010 753 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
2c5e8933
HFS		 754 ipv6_dev_mc_dec(dev, &in6addr_interfacelocal_allrouters);
755 ipv6_dev_mc_dec(dev, &in6addr_sitelocal_allrouters);
756 }
1da177e4 757 }
502a2ffd 758
759 list_for_each_entry(ifa, &idev->addr_list, if_list) {
2c12a74c
MW		 760 if (ifa->flags&IFA_F_TENTATIVE)
761 continue;
1da177e4
LT		 762 if (idev->cnf.forwarding)
763 addrconf_join_anycast(ifa);
764 else
765 addrconf_leave_anycast(ifa);
766 }
f3a1bfb1
ND		 767 inet6_netconf_notify_devconf(dev_net(dev), NETCONFA_FORWARDING,
768 dev->ifindex, &idev->cnf);
1da177e4
LT		 769}
770
771
e186932b 772static void addrconf_forward_change(struct net *net, __s32 newf)
1da177e4
LT		 773{
774 struct net_device *dev;
775 struct inet6_dev *idev;
776
4acd4945 777 for_each_netdev(net, dev) {
1da177e4
LT		 778 idev = __in6_dev_get(dev);
779 if (idev) {
e186932b
PE		 780 int changed = (!idev->cnf.forwarding) ^ (!newf);
781 idev->cnf.forwarding = newf;
1da177e4
LT		 782 if (changed)
783 dev_forward_change(idev);
784 }
1da177e4 785 }
1da177e4 786}
c8fecf22 787
013d97e9 788static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf)
c8fecf22 789{
bff16c2f 790 struct net *net;
013d97e9
FR		 791 int old;
792
793 if (!rtnl_trylock())
794 return restart_syscall();
bff16c2f
PE		 795
796 net = (struct net *)table->extra2;
013d97e9
FR		 797 old = *p;
798 *p = newf;
b325fddb 799
013d97e9 800 if (p == &net->ipv6.devconf_dflt->forwarding) {
f3a1bfb1
ND		 801 if ((!newf) ^ (!old))
802 inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING,
803 NETCONFA_IFINDEX_DEFAULT,
804 net->ipv6.devconf_dflt);
013d97e9
FR		 805 rtnl_unlock();
806 return 0;
88af182e 807 }
c8fecf22 808
e186932b 809 if (p == &net->ipv6.devconf_all->forwarding) {
d26c638c
ND		 810 int old_dflt = net->ipv6.devconf_dflt->forwarding;
811
e186932b 812 net->ipv6.devconf_dflt->forwarding = newf;
d26c638c
ND		 813 if ((!newf) ^ (!old_dflt))
814 inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING,
815 NETCONFA_IFINDEX_DEFAULT,
816 net->ipv6.devconf_dflt);
817
e186932b 818 addrconf_forward_change(net, newf);
f3a1bfb1
ND		 819 if ((!newf) ^ (!old))
820 inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING,
821 NETCONFA_IFINDEX_ALL,
822 net->ipv6.devconf_all);
013d97e9 823 } else if ((!newf) ^ (!old))
c8fecf22 824 dev_forward_change((struct inet6_dev *)table->extra1);
0187bdfb 825 rtnl_unlock();
c8fecf22 826
013d97e9 827 if (newf)
7b4da532 828 rt6_purge_dflt_routers(net);
b325fddb 829 return 1;
c8fecf22 830}
35103d11
AG		 831
832static void addrconf_linkdown_change(struct net *net, __s32 newf)
833{
834 struct net_device *dev;
835 struct inet6_dev *idev;
836
837 for_each_netdev(net, dev) {
838 idev = __in6_dev_get(dev);
839 if (idev) {
840 int changed = (!idev->cnf.ignore_routes_with_linkdown) ^ (!newf);
841
842 idev->cnf.ignore_routes_with_linkdown = newf;
843 if (changed)
844 inet6_netconf_notify_devconf(dev_net(dev),
845 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
846 dev->ifindex,
847 &idev->cnf);
848 }
849 }
850}
851
852static int addrconf_fixup_linkdown(struct ctl_table *table, int *p, int newf)
853{
854 struct net *net;
855 int old;
856
857 if (!rtnl_trylock())
858 return restart_syscall();
859
860 net = (struct net *)table->extra2;
861 old = *p;
862 *p = newf;
863
864 if (p == &net->ipv6.devconf_dflt->ignore_routes_with_linkdown) {
865 if ((!newf) ^ (!old))
866 inet6_netconf_notify_devconf(net,
867 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
868 NETCONFA_IFINDEX_DEFAULT,
869 net->ipv6.devconf_dflt);
870 rtnl_unlock();
871 return 0;
872 }
873
874 if (p == &net->ipv6.devconf_all->ignore_routes_with_linkdown) {
875 net->ipv6.devconf_dflt->ignore_routes_with_linkdown = newf;
876 addrconf_linkdown_change(net, newf);
877 if ((!newf) ^ (!old))
878 inet6_netconf_notify_devconf(net,
879 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
880 NETCONFA_IFINDEX_ALL,
881 net->ipv6.devconf_all);
882 }
883 rtnl_unlock();
884
885 return 1;
886}
887
1da177e4
LT		 888#endif
889
5c578aed 890/* Nobody refers to this ifaddr, destroy it */
1da177e4
LT		 891void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
892{
c2e21293 893 WARN_ON(!hlist_unhashed(&ifp->addr_lst));
547b792c 894
1da177e4 895#ifdef NET_REFCNT_DEBUG
91df42be 896 pr_debug("%s\n", __func__);
1da177e4
LT		 897#endif
898
899 in6_dev_put(ifp->idev);
900
c15b1cca
HFS		 901 if (cancel_delayed_work(&ifp->dad_work))
902 pr_notice("delayed DAD work was pending while freeing ifa=%p\n",
903 ifp);
1da177e4 904
e9d3e084 905 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
f3213831 906 pr_warn("Freeing alive inet6 address %p\n", ifp);
1da177e4
LT		 907 return;
908 }
94e187c0 909 ip6_rt_put(ifp->rt);
1da177e4 910
e5785985 911 kfree_rcu(ifp, rcu);
1da177e4
LT		 912}
913
e55ffac6
BH		 914static void
915ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
916{
502a2ffd 917 struct list_head *p;
8a6ce0c0 918 int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
e55ffac6
BH		 919
920 /*
921 * Each device address list is sorted in order of scope -
922 * global before linklocal.
923 */
502a2ffd 924 list_for_each(p, &idev->addr_list) {
925 struct inet6_ifaddr *ifa
926 = list_entry(p, struct inet6_ifaddr, if_list);
8a6ce0c0 927 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
e55ffac6
BH		 928 break;
929 }
930
b54c9b98 931 list_add_tail(&ifp->if_list, p);
e55ffac6
BH		 932}
933
ddbe5032 934static u32 inet6_addr_hash(const struct in6_addr *addr)
3eb84f49 935{
ddbe5032 936 return hash_32(ipv6_addr_hash(addr), IN6_ADDR_HSIZE_SHIFT);
3eb84f49
YH		 937}
938
1da177e4
LT		 939/* On success it returns ifp with increased reference count */
940
941static struct inet6_ifaddr *
3f8f5298
JP		 942ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
943 const struct in6_addr *peer_addr, int pfxlen,
8a226b2c 944 int scope, u32 flags, u32 valid_lft, u32 prefered_lft)
1da177e4
LT		 945{
946 struct inet6_ifaddr *ifa = NULL;
947 struct rt6_info *rt;
3a88a81d 948 unsigned int hash;
1da177e4 949 int err = 0;
d68b8270
YH		 950 int addr_type = ipv6_addr_type(addr);
951
952 if (addr_type == IPV6_ADDR_ANY ||
953 addr_type & IPV6_ADDR_MULTICAST ||
954 (!(idev->dev->flags & IFF_LOOPBACK) &&
955 addr_type & IPV6_ADDR_LOOPBACK))
956 return ERR_PTR(-EADDRNOTAVAIL);
1da177e4 957
8814c4b5 958 rcu_read_lock_bh();
1da177e4
LT		 959 if (idev->dead) {
960 err = -ENODEV; /*XXX*/
961 goto out2;
962 }
963
56d417b1 964 if (idev->cnf.disable_ipv6) {
9bdd8d40
BH		 965 err = -EACCES;
966 goto out2;
967 }
968
5c578aed 969 spin_lock(&addrconf_hash_lock);
1da177e4
LT		 970
971 /* Ignore adding duplicate addresses on an interface */
c346dca1 972 if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) {
ba3542e1 973 ADBG("ipv6_add_addr: already assigned\n");
1da177e4
LT		 974 err = -EEXIST;
975 goto out;
976 }
977
322f74a4 978 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
1da177e4 979
63159f29 980 if (!ifa) {
ba3542e1 981 ADBG("ipv6_add_addr: malloc failed\n");
1da177e4
LT		 982 err = -ENOBUFS;
983 goto out;
984 }
985
8f031519 986 rt = addrconf_dst_alloc(idev, addr, false);
1da177e4
LT		 987 if (IS_ERR(rt)) {
988 err = PTR_ERR(rt);
989 goto out;
990 }
991
bba24896
JP		 992 neigh_parms_data_state_setall(idev->nd_parms);
993
4e3fd7a0 994 ifa->addr = *addr;
3f8f5298
JP		 995 if (peer_addr)
996 ifa->peer_addr = *peer_addr;
1da177e4
LT		 997
998 spin_lock_init(&ifa->lock);
c15b1cca 999 INIT_DELAYED_WORK(&ifa->dad_work, addrconf_dad_work);
c2e21293 1000 INIT_HLIST_NODE(&ifa->addr_lst);
1da177e4
LT		 1001 ifa->scope = scope;
1002 ifa->prefix_len = pfxlen;
1003 ifa->flags = flags | IFA_F_TENTATIVE;
8a226b2c
JB		 1004 ifa->valid_lft = valid_lft;
1005 ifa->prefered_lft = prefered_lft;
1da177e4 1006 ifa->cstamp = ifa->tstamp = jiffies;
617fe29d 1007 ifa->tokenized = false;
1da177e4 1008
57f5f544
KF		 1009 ifa->rt = rt;
1010
1da177e4
LT		 1011 ifa->idev = idev;
1012 in6_dev_hold(idev);
1013 /* For caller */
1014 in6_ifa_hold(ifa);
1015
1016 /* Add to big hash table */
ddbe5032 1017 hash = inet6_addr_hash(addr);
1da177e4 1018
5c578aed 1019 hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]);
5c578aed 1020 spin_unlock(&addrconf_hash_lock);
1da177e4
LT		 1021
1022 write_lock(&idev->lock);
1023 /* Add to inet6_dev unicast addr list. */
e55ffac6 1024 ipv6_link_dev_addr(idev, ifa);
1da177e4 1025
1da177e4 1026 if (ifa->flags&IFA_F_TEMPORARY) {
372e6c8f 1027 list_add(&ifa->tmp_list, &idev->tempaddr_list);
1da177e4
LT		 1028 in6_ifa_hold(ifa);
1029 }
1da177e4 1030
1da177e4
LT		 1031 in6_ifa_hold(ifa);
1032 write_unlock(&idev->lock);
1033out2:
8814c4b5 1034 rcu_read_unlock_bh();
1da177e4 1035
fd92833a 1036 if (likely(err == 0))
f88c91dd 1037 inet6addr_notifier_call_chain(NETDEV_UP, ifa);
1da177e4
LT		 1038 else {
1039 kfree(ifa);
1040 ifa = ERR_PTR(err);
1041 }
1042
1043 return ifa;
1044out:
5c578aed 1045 spin_unlock(&addrconf_hash_lock);
1da177e4
LT		 1046 goto out2;
1047}
1048
5b84efec
TH		 1049enum cleanup_prefix_rt_t {
1050 CLEANUP_PREFIX_RT_NOP, /* no cleanup action for prefix route */
1051 CLEANUP_PREFIX_RT_DEL, /* delete the prefix route */
1052 CLEANUP_PREFIX_RT_EXPIRE, /* update the lifetime of the prefix route */
1053};
1054
1055/*
1056 * Check, whether the prefix for ifp would still need a prefix route
1057 * after deleting ifp. The function returns one of the CLEANUP_PREFIX_RT_*
1058 * constants.
1059 *
1060 * 1) we don't purge prefix if address was not permanent.
1061 * prefix is managed by its own lifetime.
1062 * 2) we also don't purge, if the address was IFA_F_NOPREFIXROUTE.
1063 * 3) if there are no addresses, delete prefix.
1064 * 4) if there are still other permanent address(es),
1065 * corresponding prefix is still permanent.
1066 * 5) if there are still other addresses with IFA_F_NOPREFIXROUTE,
1067 * don't purge the prefix, assume user space is managing it.
1068 * 6) otherwise, update prefix lifetime to the
1069 * longest valid lifetime among the corresponding
1070 * addresses on the device.
1071 * Note: subsequent RA will update lifetime.
1072 **/
1073static enum cleanup_prefix_rt_t
1074check_cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long *expires)
1075{
1076 struct inet6_ifaddr *ifa;
1077 struct inet6_dev *idev = ifp->idev;
1078 unsigned long lifetime;
1079 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_DEL;
1080
1081 *expires = jiffies;
1082
1083 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1084 if (ifa == ifp)
1085 continue;
1086 if (!ipv6_prefix_equal(&ifa->addr, &ifp->addr,
1087 ifp->prefix_len))
1088 continue;
1089 if (ifa->flags & (IFA_F_PERMANENT | IFA_F_NOPREFIXROUTE))
1090 return CLEANUP_PREFIX_RT_NOP;
1091
1092 action = CLEANUP_PREFIX_RT_EXPIRE;
1093
1094 spin_lock(&ifa->lock);
1095
1096 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
1097 /*
1098 * Note: Because this address is
1099 * not permanent, lifetime <
1100 * LONG_MAX / HZ here.
1101 */
1102 if (time_before(*expires, ifa->tstamp + lifetime * HZ))
1103 *expires = ifa->tstamp + lifetime * HZ;
1104 spin_unlock(&ifa->lock);
1105 }
1106
1107 return action;
1108}
1109
1110static void
1111cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long expires, bool del_rt)
1112{
1113 struct rt6_info *rt;
1114
1115 rt = addrconf_get_prefix_route(&ifp->addr,
1116 ifp->prefix_len,
1117 ifp->idev->dev,
1118 0, RTF_GATEWAY | RTF_DEFAULT);
1119 if (rt) {
1120 if (del_rt)
1121 ip6_del_rt(rt);
1122 else {
1123 if (!(rt->rt6i_flags & RTF_EXPIRES))
1124 rt6_set_expires(rt, expires);
1125 ip6_rt_put(rt);
1126 }
1127 }
1128}
1129
1130
1da177e4
LT		 1131/* This function wants to get referenced ifp and releases it before return */
1132
1133static void ipv6_del_addr(struct inet6_ifaddr *ifp)
1134{
4c5ff6a6 1135 int state;
5b84efec
TH		 1136 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_NOP;
1137 unsigned long expires;
1da177e4 1138
c15b1cca
HFS		 1139 ASSERT_RTNL();
1140
8e8e676d 1141 spin_lock_bh(&ifp->lock);
4c5ff6a6 1142 state = ifp->state;
e9d3e084 1143 ifp->state = INET6_IFADDR_STATE_DEAD;
8e8e676d 1144 spin_unlock_bh(&ifp->lock);
4c5ff6a6
HX		 1145
1146 if (state == INET6_IFADDR_STATE_DEAD)
1147 goto out;
1da177e4 1148
5c578aed 1149 spin_lock_bh(&addrconf_hash_lock);
1150 hlist_del_init_rcu(&ifp->addr_lst);
5c578aed 1151 spin_unlock_bh(&addrconf_hash_lock);
1da177e4 1152
5b84efec 1153 write_lock_bh(&ifp->idev->lock);
5d9efa7e 1154
1da177e4 1155 if (ifp->flags&IFA_F_TEMPORARY) {
372e6c8f 1156 list_del(&ifp->tmp_list);
1157 if (ifp->ifpub) {
1158 in6_ifa_put(ifp->ifpub);
1159 ifp->ifpub = NULL;
1da177e4 1160 }
372e6c8f 1161 __in6_ifa_put(ifp);
1da177e4 1162 }
1da177e4 1163
5b84efec
TH		 1164 if (ifp->flags & IFA_F_PERMANENT && !(ifp->flags & IFA_F_NOPREFIXROUTE))
1165 action = check_cleanup_prefix_route(ifp, &expires);
502a2ffd 1166
5b84efec
TH		 1167 list_del_init(&ifp->if_list);
1168 __in6_ifa_put(ifp);
1169
1170 write_unlock_bh(&ifp->idev->lock);
1da177e4 1171
c15b1cca 1172 addrconf_del_dad_work(ifp);
b2238566 1173
1da177e4
LT		 1174 ipv6_ifa_notify(RTM_DELADDR, ifp);
1175
f88c91dd 1176 inet6addr_notifier_call_chain(NETDEV_DOWN, ifp);
1da177e4 1177
5b84efec
TH		 1178 if (action != CLEANUP_PREFIX_RT_NOP) {
1179 cleanup_prefix_route(ifp, expires,
1180 action == CLEANUP_PREFIX_RT_DEL);
1da177e4
LT		 1181 }
1182
c3968a85
DW		 1183 /* clean up prefsrc entries */
1184 rt6_remove_prefsrc(ifp);
4c5ff6a6 1185out:
1da177e4
LT		 1186 in6_ifa_put(ifp);
1187}
1188
1da177e4
LT		 1189static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
1190{
1191 struct inet6_dev *idev = ifp->idev;
1192 struct in6_addr addr, *tmpaddr;
76f793e3 1193 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_tstamp, age;
eac55bf9 1194 unsigned long regen_advance;
1da177e4
LT		 1195 int tmp_plen;
1196 int ret = 0;
95c385b4 1197 u32 addr_flags;
76f793e3 1198 unsigned long now = jiffies;
76506a98 1199 long max_desync_factor;
7aa8e63f 1200 s32 cnf_temp_preferred_lft;
1da177e4 1201
53bd6749 1202 write_lock_bh(&idev->lock);
1da177e4
LT		 1203 if (ift) {
1204 spin_lock_bh(&ift->lock);
1205 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
1206 spin_unlock_bh(&ift->lock);
1207 tmpaddr = &addr;
1208 } else {
1209 tmpaddr = NULL;
1210 }
1211retry:
1212 in6_dev_hold(idev);
1213 if (idev->cnf.use_tempaddr <= 0) {
53bd6749 1214 write_unlock_bh(&idev->lock);
f3213831 1215 pr_info("%s: use_tempaddr is disabled\n", __func__);
1da177e4
LT		 1216 in6_dev_put(idev);
1217 ret = -1;
1218 goto out;
1219 }
1220 spin_lock_bh(&ifp->lock);
1221 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
1222 idev->cnf.use_tempaddr = -1; /*XXX*/
1223 spin_unlock_bh(&ifp->lock);
53bd6749 1224 write_unlock_bh(&idev->lock);
f3213831
JP		 1225 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n",
1226 __func__);
1da177e4
LT		 1227 in6_dev_put(idev);
1228 ret = -1;
1229 goto out;
1230 }
1231 in6_ifa_hold(ifp);
1232 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
9d6280da 1233 ipv6_try_regen_rndid(idev, tmpaddr);
1da177e4 1234 memcpy(&addr.s6_addr[8], idev->rndid, 8);
76f793e3 1235 age = (now - ifp->tstamp) / HZ;
76506a98
JB		 1236
1237 regen_advance = idev->cnf.regen_max_retry *
1238 idev->cnf.dad_transmits *
1239 NEIGH_VAR(idev->nd_parms, RETRANS_TIME) / HZ;
1240
1241 /* recalculate max_desync_factor each time and update
1242 * idev->desync_factor if it's larger
1243 */
7aa8e63f 1244 cnf_temp_preferred_lft = READ_ONCE(idev->cnf.temp_prefered_lft);
76506a98
JB		 1245 max_desync_factor = min_t(__u32,
1246 idev->cnf.max_desync_factor,
7aa8e63f 1247 cnf_temp_preferred_lft - regen_advance);
76506a98
JB		 1248
1249 if (unlikely(idev->desync_factor > max_desync_factor)) {
1250 if (max_desync_factor > 0) {
1251 get_random_bytes(&idev->desync_factor,
1252 sizeof(idev->desync_factor));
1253 idev->desync_factor %= max_desync_factor;
1254 } else {
1255 idev->desync_factor = 0;
1256 }
1257 }
1258
1da177e4
LT		 1259 tmp_valid_lft = min_t(__u32,
1260 ifp->valid_lft,
7a876b0e 1261 idev->cnf.temp_valid_lft + age);
7aa8e63f 1262 tmp_prefered_lft = cnf_temp_preferred_lft + age -
76506a98 1263 idev->desync_factor;
76506a98 1264 tmp_prefered_lft = min_t(__u32, ifp->prefered_lft, tmp_prefered_lft);
1da177e4 1265 tmp_plen = ifp->prefix_len;
1da177e4
LT		 1266 tmp_tstamp = ifp->tstamp;
1267 spin_unlock_bh(&ifp->lock);
1268
53bd6749 1269 write_unlock_bh(&idev->lock);
95c385b4 1270
eac55bf9
BB		 1271 /* A temporary address is created only if this calculated Preferred
1272 * Lifetime is greater than REGEN_ADVANCE time units. In particular,
1273 * an implementation must not create a temporary address with a zero
1274 * Preferred Lifetime.
ecab6701
HK		 1275 * Use age calculation as in addrconf_verify to avoid unnecessary
1276 * temporary addresses being generated.
eac55bf9 1277 */
ecab6701
HK		 1278 age = (now - tmp_tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
1279 if (tmp_prefered_lft <= regen_advance + age) {
eac55bf9
BB		 1280 in6_ifa_put(ifp);
1281 in6_dev_put(idev);
1282 ret = -1;
1283 goto out;
1284 }
1285
95c385b4
NH		 1286 addr_flags = IFA_F_TEMPORARY;
1287 /* set in addrconf_prefix_rcv() */
1288 if (ifp->flags & IFA_F_OPTIMISTIC)
1289 addr_flags |= IFA_F_OPTIMISTIC;
1290
4b08a8f1
HFS		 1291 ift = ipv6_add_addr(idev, &addr, NULL, tmp_plen,
1292 ipv6_addr_scope(&addr), addr_flags,
1293 tmp_valid_lft, tmp_prefered_lft);
1294 if (IS_ERR(ift)) {
1da177e4
LT		 1295 in6_ifa_put(ifp);
1296 in6_dev_put(idev);
f3213831 1297 pr_info("%s: retry temporary address regeneration\n", __func__);
1da177e4 1298 tmpaddr = &addr;
53bd6749 1299 write_lock_bh(&idev->lock);
1da177e4
LT		 1300 goto retry;
1301 }
1302
1303 spin_lock_bh(&ift->lock);
1304 ift->ifpub = ifp;
76f793e3 1305 ift->cstamp = now;
1da177e4
LT		 1306 ift->tstamp = tmp_tstamp;
1307 spin_unlock_bh(&ift->lock);
1308
cf22f9a2 1309 addrconf_dad_start(ift);
1da177e4
LT		 1310 in6_ifa_put(ift);
1311 in6_dev_put(idev);
1312out:
1313 return ret;
1314}
1da177e4
LT		 1315
1316/*
072047e4 1317 * Choose an appropriate source address (RFC3484)
1da177e4 1318 */
a9b05723
YH		 1319enum {
1320 IPV6_SADDR_RULE_INIT = 0,
1321 IPV6_SADDR_RULE_LOCAL,
1322 IPV6_SADDR_RULE_SCOPE,
1323 IPV6_SADDR_RULE_PREFERRED,
1324#ifdef CONFIG_IPV6_MIP6
1325 IPV6_SADDR_RULE_HOA,
1326#endif
1327 IPV6_SADDR_RULE_OIF,
1328 IPV6_SADDR_RULE_LABEL,
a9b05723 1329 IPV6_SADDR_RULE_PRIVACY,
a9b05723
YH		 1330 IPV6_SADDR_RULE_ORCHID,
1331 IPV6_SADDR_RULE_PREFIX,
7fd2561e
EK		 1332#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1333 IPV6_SADDR_RULE_NOT_OPTIMISTIC,
1334#endif
a9b05723
YH		 1335 IPV6_SADDR_RULE_MAX
1336};
1337
072047e4 1338struct ipv6_saddr_score {
a9b05723
YH		 1339 int rule;
1340 int addr_type;
1341 struct inet6_ifaddr *ifa;
1342 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
1343 int scopedist;
1344 int matchlen;
072047e4
YH		 1345};
1346
a9b05723 1347struct ipv6_saddr_dst {
9acd9f3a 1348 const struct in6_addr *addr;
a9b05723
YH		 1349 int ifindex;
1350 int scope;
1351 int label;
7cbca67c 1352 unsigned int prefs;
a9b05723 1353};
072047e4 1354
b6f99a21 1355static inline int ipv6_saddr_preferred(int type)
1da177e4 1356{
45bb0060 1357 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
072047e4
YH		 1358 return 1;
1359 return 0;
1da177e4
LT		 1360}
1361
7fd2561e
EK		 1362static inline bool ipv6_use_optimistic_addr(struct inet6_dev *idev)
1363{
1364#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1365 return idev && idev->cnf.optimistic_dad && idev->cnf.use_optimistic;
1366#else
1367 return false;
1368#endif
1369}
1370
3de23255
BT		 1371static int ipv6_get_saddr_eval(struct net *net,
1372 struct ipv6_saddr_score *score,
a9b05723
YH		 1373 struct ipv6_saddr_dst *dst,
1374 int i)
1375{
1376 int ret;
1377
1378 if (i <= score->rule) {
1379 switch (i) {
1380 case IPV6_SADDR_RULE_SCOPE:
1381 ret = score->scopedist;
1382 break;
1383 case IPV6_SADDR_RULE_PREFIX:
1384 ret = score->matchlen;
1385 break;
1386 default:
1387 ret = !!test_bit(i, score->scorebits);
1388 }
1389 goto out;
1390 }
1391
1392 switch (i) {
1393 case IPV6_SADDR_RULE_INIT:
1394 /* Rule 0: remember if hiscore is not ready yet */
1395 ret = !!score->ifa;
1396 break;
1397 case IPV6_SADDR_RULE_LOCAL:
1398 /* Rule 1: Prefer same address */
1399 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1400 break;
1401 case IPV6_SADDR_RULE_SCOPE:
1402 /* Rule 2: Prefer appropriate scope
1403 *
1404 * ret
1405 * ^
1406 * -1 | d 15
1407 * ---+--+-+---> scope
1408 * |
1409 * | d is scope of the destination.
1410 * B-d | \
1411 * | \ <- smaller scope is better if
db9c7c39 1412 * B-15 | \ if scope is enough for destination.
a9b05723
YH		 1413 * | ret = B - scope (-1 <= scope >= d <= 15).
1414 * d-C-1 | /
1415 * |/ <- greater is better
1416 * -C / if scope is not enough for destination.
1417 * /| ret = scope - C (-1 <= d < scope <= 15).
1418 *
1419 * d - C - 1 < B -15 (for all -1 <= d <= 15).
1420 * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1421 * Assume B = 0 and we get C > 29.
1422 */
1423 ret = __ipv6_addr_src_scope(score->addr_type);
1424 if (ret >= dst->scope)
1425 ret = -ret;
1426 else
1427 ret -= 128; /* 30 is enough */
1428 score->scopedist = ret;
1429 break;
1430 case IPV6_SADDR_RULE_PREFERRED:
7fd2561e 1431 {
a9b05723 1432 /* Rule 3: Avoid deprecated and optimistic addresses */
7fd2561e
EK		 1433 u8 avoid = IFA_F_DEPRECATED;
1434
1435 if (!ipv6_use_optimistic_addr(score->ifa->idev))
1436 avoid |= IFA_F_OPTIMISTIC;
a9b05723 1437 ret = ipv6_saddr_preferred(score->addr_type) ||
7fd2561e 1438 !(score->ifa->flags & avoid);
a9b05723 1439 break;
7fd2561e 1440 }
a9b05723
YH		 1441#ifdef CONFIG_IPV6_MIP6
1442 case IPV6_SADDR_RULE_HOA:
7cbca67c 1443 {
a9b05723 1444 /* Rule 4: Prefer home address */
7cbca67c
YH		 1445 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1446 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
a9b05723 1447 break;
7cbca67c 1448 }
a9b05723
YH		 1449#endif
1450 case IPV6_SADDR_RULE_OIF:
1451 /* Rule 5: Prefer outgoing interface */
1452 ret = (!dst->ifindex ||
1453 dst->ifindex == score->ifa->idev->dev->ifindex);
1454 break;
1455 case IPV6_SADDR_RULE_LABEL:
1456 /* Rule 6: Prefer matching label */
3de23255
BT		 1457 ret = ipv6_addr_label(net,
1458 &score->ifa->addr, score->addr_type,
a9b05723
YH		 1459 score->ifa->idev->dev->ifindex) == dst->label;
1460 break;
a9b05723 1461 case IPV6_SADDR_RULE_PRIVACY:
7cbca67c 1462 {
a9b05723 1463 /* Rule 7: Prefer public address
25985edc 1464 * Note: prefer temporary address if use_tempaddr >= 2
a9b05723 1465 */
7cbca67c
YH		 1466 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1467 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1468 score->ifa->idev->cnf.use_tempaddr >= 2;
1469 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
a9b05723 1470 break;
7cbca67c 1471 }
a9b05723
YH		 1472 case IPV6_SADDR_RULE_ORCHID:
1473 /* Rule 8-: Prefer ORCHID vs ORCHID or
1474 * non-ORCHID vs non-ORCHID
1475 */
1476 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1477 ipv6_addr_orchid(dst->addr));
1478 break;
1479 case IPV6_SADDR_RULE_PREFIX:
1480 /* Rule 8: Use longest matching prefix */
91b4b04f
YH		 1481 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr);
1482 if (ret > score->ifa->prefix_len)
1483 ret = score->ifa->prefix_len;
1484 score->matchlen = ret;
a9b05723 1485 break;
7fd2561e
EK		 1486#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1487 case IPV6_SADDR_RULE_NOT_OPTIMISTIC:
1488 /* Optimistic addresses still have lower precedence than other
1489 * preferred addresses.
1490 */
1491 ret = !(score->ifa->flags & IFA_F_OPTIMISTIC);
1492 break;
1493#endif
a9b05723
YH		 1494 default:
1495 ret = 0;
1496 }
1497
1498 if (ret)
1499 __set_bit(i, score->scorebits);
1500 score->rule = i;
1501out:
1502 return ret;
1503}
1504
c0b8da1e
YH		 1505static int __ipv6_dev_get_saddr(struct net *net,
1506 struct ipv6_saddr_dst *dst,
c0b8da1e
YH		 1507 struct inet6_dev *idev,
1508 struct ipv6_saddr_score *scores,
1509 int hiscore_idx)
9131f3de 1510{
c0b8da1e 1511 struct ipv6_saddr_score *score = &scores[1 - hiscore_idx], *hiscore = &scores[hiscore_idx];
9131f3de
YH		 1512
1513 read_lock_bh(&idev->lock);
1514 list_for_each_entry(score->ifa, &idev->addr_list, if_list) {
1515 int i;
1516
1517 /*
1518 * - Tentative Address (RFC2462 section 5.4)
1519 * - A tentative address is not considered
1520 * "assigned to an interface" in the traditional
1521 * sense, unless it is also flagged as optimistic.
1522 * - Candidate Source Address (section 4)
1523 * - In any case, anycast addresses, multicast
1524 * addresses, and the unspecified address MUST
1525 * NOT be included in a candidate set.
1526 */
1527 if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1528 (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
1529 continue;
1530
1531 score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1532
1533 if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1534 score->addr_type & IPV6_ADDR_MULTICAST)) {
1535 net_dbg_ratelimited("ADDRCONF: unspecified / multicast address assigned as unicast address on %s",
1536 idev->dev->name);
1537 continue;
1538 }
1539
1540 score->rule = -1;
1541 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1542
1543 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1544 int minihiscore, miniscore;
1545
1546 minihiscore = ipv6_get_saddr_eval(net, hiscore, dst, i);
1547 miniscore = ipv6_get_saddr_eval(net, score, dst, i);
1548
1549 if (minihiscore > miniscore) {
1550 if (i == IPV6_SADDR_RULE_SCOPE &&
1551 score->scopedist > 0) {
1552 /*
1553 * special case:
1554 * each remaining entry
1555 * has too small (not enough)
1556 * scope, because ifa entries
1557 * are sorted by their scope
1558 * values.
1559 */
1560 goto out;
1561 }
1562 break;
1563 } else if (minihiscore < miniscore) {
1564 if (hiscore->ifa)
1565 in6_ifa_put(hiscore->ifa);
1566
1567 in6_ifa_hold(score->ifa);
1568
1569 swap(hiscore, score);
c0b8da1e 1570 hiscore_idx = 1 - hiscore_idx;
9131f3de
YH		 1571
1572 /* restore our iterator */
1573 score->ifa = hiscore->ifa;
1574
1575 break;
1576 }
1577 }
1578 }
1579out:
1580 read_unlock_bh(&idev->lock);
c0b8da1e 1581 return hiscore_idx;
9131f3de
YH		 1582}
1583
afbac601
DA		 1584static int ipv6_get_saddr_master(struct net *net,
1585 const struct net_device *dst_dev,
1586 const struct net_device *master,
1587 struct ipv6_saddr_dst *dst,
1588 struct ipv6_saddr_score *scores,
1589 int hiscore_idx)
1590{
1591 struct inet6_dev *idev;
1592
1593 idev = __in6_dev_get(dst_dev);
1594 if (idev)
1595 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev,
1596 scores, hiscore_idx);
1597
1598 idev = __in6_dev_get(master);
1599 if (idev)
1600 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev,
1601 scores, hiscore_idx);
1602
1603 return hiscore_idx;
1604}
1605
b3f644fc 1606int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev,
9acd9f3a 1607 const struct in6_addr *daddr, unsigned int prefs,
7cbca67c 1608 struct in6_addr *saddr)
1da177e4 1609{
c0b8da1e 1610 struct ipv6_saddr_score scores[2], *hiscore;
a9b05723 1611 struct ipv6_saddr_dst dst;
9131f3de 1612 struct inet6_dev *idev;
072047e4 1613 struct net_device *dev;
a9b05723 1614 int dst_type;
9131f3de 1615 bool use_oif_addr = false;
c0b8da1e 1616 int hiscore_idx = 0;
1da177e4 1617
a9b05723
YH		 1618 dst_type = __ipv6_addr_type(daddr);
1619 dst.addr = daddr;
1620 dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1621 dst.scope = __ipv6_addr_src_scope(dst_type);
3de23255 1622 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
7cbca67c 1623 dst.prefs = prefs;
a9b05723 1624
c0b8da1e
YH		 1625 scores[hiscore_idx].rule = -1;
1626 scores[hiscore_idx].ifa = NULL;
1da177e4 1627
8814c4b5 1628 rcu_read_lock();
1da177e4 1629
9131f3de
YH		 1630 /* Candidate Source Address (section 4)
1631 * - multicast and link-local destination address,
1632 * the set of candidate source address MUST only
1633 * include addresses assigned to interfaces
1634 * belonging to the same link as the outgoing
1635 * interface.
1636 * (- For site-local destination addresses, the
1637 * set of candidate source addresses MUST only
1638 * include addresses assigned to interfaces
1639 * belonging to the same site as the outgoing
1640 * interface.)
3985e8a3
EK		 1641 * - "It is RECOMMENDED that the candidate source addresses
1642 * be the set of unicast addresses assigned to the
1643 * interface that will be used to send to the destination
1644 * (the 'outgoing' interface)." (RFC 6724)
9131f3de
YH		 1645 */
1646 if (dst_dev) {
3985e8a3 1647 idev = __in6_dev_get(dst_dev);
9131f3de 1648 if ((dst_type & IPV6_ADDR_MULTICAST) ||
3985e8a3
EK		 1649 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL ||
1650 (idev && idev->cnf.use_oif_addrs_only)) {
9131f3de
YH		 1651 use_oif_addr = true;
1652 }
1653 }
a9b05723 1654
9131f3de 1655 if (use_oif_addr) {
c0b8da1e 1656 if (idev)
c15df306 1657 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx);
9131f3de 1658 } else {
afbac601
DA		 1659 const struct net_device *master;
1660 int master_idx = 0;
1661
1662 /* if dst_dev exists and is enslaved to an L3 device, then
1663 * prefer addresses from dst_dev and then the master over
1664 * any other enslaved devices in the L3 domain.
1665 */
1666 master = l3mdev_master_dev_rcu(dst_dev);
1667 if (master) {
1668 master_idx = master->ifindex;
1669
1670 hiscore_idx = ipv6_get_saddr_master(net, dst_dev,
1671 master, &dst,
1672 scores, hiscore_idx);
1673
1674 if (scores[hiscore_idx].ifa)
1675 goto out;
1676 }
1677
9131f3de 1678 for_each_netdev_rcu(net, dev) {
afbac601
DA		 1679 /* only consider addresses on devices in the
1680 * same L3 domain
1681 */
1682 if (l3mdev_master_ifindex_rcu(dev) != master_idx)
1683 continue;
9131f3de
YH		 1684 idev = __in6_dev_get(dev);
1685 if (!idev)
072047e4 1686 continue;
c15df306 1687 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx);
1da177e4
LT		 1688 }
1689 }
afbac601
DA		 1690
1691out:
8814c4b5 1692 rcu_read_unlock();
1da177e4 1693
c0b8da1e 1694 hiscore = &scores[hiscore_idx];
a9b05723 1695 if (!hiscore->ifa)
072047e4 1696 return -EADDRNOTAVAIL;
1ab1457c 1697
4e3fd7a0 1698 *saddr = hiscore->ifa->addr;
a9b05723 1699 in6_ifa_put(hiscore->ifa);
072047e4 1700 return 0;
1da177e4 1701}
5e5f3f0f 1702EXPORT_SYMBOL(ipv6_dev_get_saddr);
1da177e4 1703
8965779d 1704int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr,
479840ff 1705 u32 banned_flags)
b7b1bfce
HFS		 1706{
1707 struct inet6_ifaddr *ifp;
1708 int err = -EADDRNOTAVAIL;
1709
602582ca
HFS		 1710 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
1711 if (ifp->scope > IFA_LINK)
1712 break;
b7b1bfce
HFS		 1713 if (ifp->scope == IFA_LINK &&
1714 !(ifp->flags & banned_flags)) {
1715 *addr = ifp->addr;
1716 err = 0;
1717 break;
1718 }
1719 }
1720 return err;
1721}
1722
95c385b4 1723int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
479840ff 1724 u32 banned_flags)
1da177e4
LT		 1725{
1726 struct inet6_dev *idev;
1727 int err = -EADDRNOTAVAIL;
1728
8814c4b5 1729 rcu_read_lock();
e21e8467
SH		 1730 idev = __in6_dev_get(dev);
1731 if (idev) {
1da177e4 1732 read_lock_bh(&idev->lock);
b7b1bfce 1733 err = __ipv6_get_lladdr(idev, addr, banned_flags);
1da177e4
LT		 1734 read_unlock_bh(&idev->lock);
1735 }
8814c4b5 1736 rcu_read_unlock();
1da177e4
LT		 1737 return err;
1738}
1739
1740static int ipv6_count_addresses(struct inet6_dev *idev)
1741{
1742 int cnt = 0;
1743 struct inet6_ifaddr *ifp;
1744
1745 read_lock_bh(&idev->lock);
502a2ffd 1746 list_for_each_entry(ifp, &idev->addr_list, if_list)
1da177e4
LT		 1747 cnt++;
1748 read_unlock_bh(&idev->lock);
1749 return cnt;
1750}
1751
b71d1d42 1752int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
2a7851bf 1753 const struct net_device *dev, int strict)
c58da4c6
EK		 1754{
1755 return ipv6_chk_addr_and_flags(net, addr, dev, strict, IFA_F_TENTATIVE);
1756}
1757EXPORT_SYMBOL(ipv6_chk_addr);
1758
1759int ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr,
1760 const struct net_device *dev, int strict,
1761 u32 banned_flags)
1da177e4 1762{
eedf042a 1763 struct inet6_ifaddr *ifp;
ddbe5032 1764 unsigned int hash = inet6_addr_hash(addr);
c58da4c6 1765 u32 ifp_flags;
1da177e4 1766
5c578aed 1767 rcu_read_lock_bh();
b67bfe0d 1768 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
878628fb 1769 if (!net_eq(dev_net(ifp->idev->dev), net))
bfeade08 1770 continue;
c58da4c6
EK		 1771 /* Decouple optimistic from tentative for evaluation here.
1772 * Ban optimistic addresses explicitly, when required.
1773 */
1774 ifp_flags = (ifp->flags&IFA_F_OPTIMISTIC)
1775 ? (ifp->flags&~IFA_F_TENTATIVE)
1776 : ifp->flags;
1da177e4 1777 if (ipv6_addr_equal(&ifp->addr, addr) &&
c58da4c6 1778 !(ifp_flags&banned_flags) &&
63159f29 1779 (!dev || ifp->idev->dev == dev ||
eedf042a
SH		 1780 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) {
1781 rcu_read_unlock_bh();
1782 return 1;
1da177e4
LT		 1783 }
1784 }
5c578aed 1785
eedf042a
SH		 1786 rcu_read_unlock_bh();
1787 return 0;
1da177e4 1788}
c58da4c6 1789EXPORT_SYMBOL(ipv6_chk_addr_and_flags);
7159039a 1790
3e81c6da
DM		 1791static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1792 struct net_device *dev)
1da177e4 1793{
ddbe5032 1794 unsigned int hash = inet6_addr_hash(addr);
c2e21293 1795 struct inet6_ifaddr *ifp;
1da177e4 1796
b67bfe0d 1797 hlist_for_each_entry(ifp, &inet6_addr_lst[hash], addr_lst) {
878628fb 1798 if (!net_eq(dev_net(ifp->idev->dev), net))
06bfe655 1799 continue;
1da177e4 1800 if (ipv6_addr_equal(&ifp->addr, addr)) {
63159f29 1801 if (!dev || ifp->idev->dev == dev)
3e81c6da 1802 return true;
1da177e4
LT		 1803 }
1804 }
3e81c6da 1805 return false;
1da177e4
LT		 1806}
1807
7df37ff3
CB		 1808/* Compares an address/prefix_len with addresses on device @dev.
1809 * If one is found it returns true.
1810 */
1811bool ipv6_chk_custom_prefix(const struct in6_addr *addr,
1812 const unsigned int prefix_len, struct net_device *dev)
1813{
1814 struct inet6_dev *idev;
1815 struct inet6_ifaddr *ifa;
1816 bool ret = false;
1817
1818 rcu_read_lock();
1819 idev = __in6_dev_get(dev);
1820 if (idev) {
1821 read_lock_bh(&idev->lock);
1822 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1823 ret = ipv6_prefix_equal(addr, &ifa->addr, prefix_len);
1824 if (ret)
1825 break;
1826 }
1827 read_unlock_bh(&idev->lock);
1828 }
1829 rcu_read_unlock();
1830
1831 return ret;
1832}
1833EXPORT_SYMBOL(ipv6_chk_custom_prefix);
1834
b71d1d42 1835int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev)
52eeeb84
YH		 1836{
1837 struct inet6_dev *idev;
1838 struct inet6_ifaddr *ifa;
1839 int onlink;
1840
1841 onlink = 0;
1842 rcu_read_lock();
1843 idev = __in6_dev_get(dev);
1844 if (idev) {
1845 read_lock_bh(&idev->lock);
502a2ffd 1846 list_for_each_entry(ifa, &idev->addr_list, if_list) {
52eeeb84
YH		 1847 onlink = ipv6_prefix_equal(addr, &ifa->addr,
1848 ifa->prefix_len);
1849 if (onlink)
1850 break;
1851 }
1852 read_unlock_bh(&idev->lock);
1853 }
1854 rcu_read_unlock();
1855 return onlink;
1856}
52eeeb84
YH		 1857EXPORT_SYMBOL(ipv6_chk_prefix);
1858
9acd9f3a 1859struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1cab3da6 1860 struct net_device *dev, int strict)
1da177e4 1861{
b79d1d54 1862 struct inet6_ifaddr *ifp, *result = NULL;
ddbe5032 1863 unsigned int hash = inet6_addr_hash(addr);
1da177e4 1864
5c578aed 1865 rcu_read_lock_bh();
b67bfe0d 1866 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
878628fb 1867 if (!net_eq(dev_net(ifp->idev->dev), net))
1cab3da6 1868 continue;
1da177e4 1869 if (ipv6_addr_equal(&ifp->addr, addr)) {
63159f29 1870 if (!dev || ifp->idev->dev == dev ||
1da177e4 1871 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
b79d1d54 1872 result = ifp;
1da177e4
LT		 1873 in6_ifa_hold(ifp);
1874 break;
1875 }
1876 }
1877 }
5c578aed 1878 rcu_read_unlock_bh();
1da177e4 1879
b79d1d54 1880 return result;
1da177e4
LT		 1881}
1882
1da177e4
LT		 1883/* Gets referenced address, destroys ifaddr */
1884
cc411d0b 1885static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
1da177e4 1886{
3d171f39
LR		 1887 if (dad_failed)
1888 ifp->flags |= IFA_F_DADFAILED;
1889
1da177e4
LT		 1890 if (ifp->flags&IFA_F_PERMANENT) {
1891 spin_lock_bh(&ifp->lock);
c15b1cca 1892 addrconf_del_dad_work(ifp);
1da177e4
LT		 1893 ifp->flags |= IFA_F_TENTATIVE;
1894 spin_unlock_bh(&ifp->lock);
e2577a06
HX		 1895 if (dad_failed)
1896 ipv6_ifa_notify(0, ifp);
1da177e4 1897 in6_ifa_put(ifp);
1da177e4
LT		 1898 } else if (ifp->flags&IFA_F_TEMPORARY) {
1899 struct inet6_ifaddr *ifpub;
1900 spin_lock_bh(&ifp->lock);
1901 ifpub = ifp->ifpub;
1902 if (ifpub) {
1903 in6_ifa_hold(ifpub);
1904 spin_unlock_bh(&ifp->lock);
1905 ipv6_create_tempaddr(ifpub, ifp);
1906 in6_ifa_put(ifpub);
1907 } else {
1908 spin_unlock_bh(&ifp->lock);
1909 }
1910 ipv6_del_addr(ifp);
c15b1cca 1911 } else {
1da177e4 1912 ipv6_del_addr(ifp);
c15b1cca 1913 }
1da177e4
LT		 1914}
1915
f2344a13
HX		 1916static int addrconf_dad_end(struct inet6_ifaddr *ifp)
1917{
1918 int err = -ENOENT;
1919
8e8e676d 1920 spin_lock_bh(&ifp->lock);
f2344a13
HX		 1921 if (ifp->state == INET6_IFADDR_STATE_DAD) {
1922 ifp->state = INET6_IFADDR_STATE_POSTDAD;
1923 err = 0;
1924 }
8e8e676d 1925 spin_unlock_bh(&ifp->lock);
f2344a13
HX		 1926
1927 return err;
1928}
1929
3c21edbd
YH		 1930void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1931{
1b34be74 1932 struct inet6_dev *idev = ifp->idev;
1855b7c3 1933 struct net *net = dev_net(ifp->idev->dev);
9bdd8d40 1934
853dc2e0
UB		 1935 if (addrconf_dad_end(ifp)) {
1936 in6_ifa_put(ifp);
f2344a13 1937 return;
853dc2e0 1938 }
f2344a13 1939
e87cc472
JP		 1940 net_info_ratelimited("%s: IPv6 duplicate address %pI6c detected!\n",
1941 ifp->idev->dev->name, &ifp->addr);
9bdd8d40 1942
5f40ef77
HFS		 1943 spin_lock_bh(&ifp->lock);
1944
1945 if (ifp->flags & IFA_F_STABLE_PRIVACY) {
1946 int scope = ifp->scope;
1947 u32 flags = ifp->flags;
1948 struct in6_addr new_addr;
1949 struct inet6_ifaddr *ifp2;
1950 u32 valid_lft, preferred_lft;
1951 int pfxlen = ifp->prefix_len;
5f40ef77
HFS		 1952 int retries = ifp->stable_privacy_retry + 1;
1953
1855b7c3 1954 if (retries > net->ipv6.sysctl.idgen_retries) {
5f40ef77
HFS		 1955 net_info_ratelimited("%s: privacy stable address generation failed because of DAD conflicts!\n",
1956 ifp->idev->dev->name);
1957 goto errdad;
1958 }
1959
1960 new_addr = ifp->addr;
1961 if (ipv6_generate_stable_address(&new_addr, retries,
1962 idev))
1963 goto errdad;
1964
1965 valid_lft = ifp->valid_lft;
1966 preferred_lft = ifp->prefered_lft;
1967
1968 spin_unlock_bh(&ifp->lock);
1b34be74 1969
5f40ef77
HFS		 1970 if (idev->cnf.max_addresses &&
1971 ipv6_count_addresses(idev) >=
1972 idev->cnf.max_addresses)
1973 goto lock_errdad;
1974
1975 net_info_ratelimited("%s: generating new stable privacy address because of DAD conflict\n",
1976 ifp->idev->dev->name);
1977
1978 ifp2 = ipv6_add_addr(idev, &new_addr, NULL, pfxlen,
1979 scope, flags, valid_lft,
1980 preferred_lft);
1981 if (IS_ERR(ifp2))
1982 goto lock_errdad;
1983
1984 spin_lock_bh(&ifp2->lock);
1985 ifp2->stable_privacy_retry = retries;
1986 ifp2->state = INET6_IFADDR_STATE_PREDAD;
1987 spin_unlock_bh(&ifp2->lock);
1988
1855b7c3 1989 addrconf_mod_dad_work(ifp2, net->ipv6.sysctl.idgen_delay);
5f40ef77
HFS		 1990 in6_ifa_put(ifp2);
1991lock_errdad:
1992 spin_lock_bh(&ifp->lock);
1b34be74
YH		 1993 }
1994
5f40ef77 1995errdad:
c15b1cca
HFS		 1996 /* transition from _POSTDAD to _ERRDAD */
1997 ifp->state = INET6_IFADDR_STATE_ERRDAD;
8e8e676d 1998 spin_unlock_bh(&ifp->lock);
c15b1cca
HFS		 1999
2000 addrconf_mod_dad_work(ifp, 0);
751eb6b6 2001 in6_ifa_put(ifp);
3c21edbd 2002}
1da177e4 2003
a9ed4a29
SD		 2004/* Join to solicited addr multicast group.
2005 * caller must hold RTNL */
b71d1d42 2006void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr)
1da177e4
LT		 2007{
2008 struct in6_addr maddr;
2009
2010 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
2011 return;
2012
2013 addrconf_addr_solict_mult(addr, &maddr);
2014 ipv6_dev_mc_inc(dev, &maddr);
2015}
2016
a9ed4a29 2017/* caller must hold RTNL */
b71d1d42 2018void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr)
1da177e4
LT		 2019{
2020 struct in6_addr maddr;
2021
2022 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
2023 return;
2024
2025 addrconf_addr_solict_mult(addr, &maddr);
2026 __ipv6_dev_mc_dec(idev, &maddr);
2027}
2028
a9ed4a29 2029/* caller must hold RTNL */
20380731 2030static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1da177e4
LT		 2031{
2032 struct in6_addr addr;
c15b1cca 2033
88ad3149 2034 if (ifp->prefix_len >= 127) /* RFC 6164 */
2bda8a0c 2035 return;
1da177e4
LT		 2036 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
2037 if (ipv6_addr_any(&addr))
2038 return;
013b4d90 2039 __ipv6_dev_ac_inc(ifp->idev, &addr);
1da177e4
LT		 2040}
2041
a9ed4a29 2042/* caller must hold RTNL */
20380731 2043static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1da177e4
LT		 2044{
2045 struct in6_addr addr;
c15b1cca 2046
88ad3149 2047 if (ifp->prefix_len >= 127) /* RFC 6164 */
32019e65 2048 return;
1da177e4
LT		 2049 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
2050 if (ipv6_addr_any(&addr))
2051 return;
2052 __ipv6_dev_ac_dec(ifp->idev, &addr);
2053}
2054
06a4c1c5 2055static int addrconf_ifid_eui64(u8 *eui, struct net_device *dev)
2056{
5241c2d7 2057 if (dev->addr_len != EUI64_ADDR_LEN)
06a4c1c5 2058 return -1;
5241c2d7 2059 memcpy(eui, dev->dev_addr, EUI64_ADDR_LEN);
5e98a36e 2060 eui[0] ^= 2;
06a4c1c5 2061 return 0;
2062}
2063
cb6bf355
YH		 2064static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev)
2065{
2066 union fwnet_hwaddr *ha;
2067
2068 if (dev->addr_len != FWNET_ALEN)
2069 return -1;
2070
2071 ha = (union fwnet_hwaddr *)dev->dev_addr;
2072
2073 memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id));
2074 eui[0] ^= 2;
2075 return 0;
2076}
2077
073a8e0e
YH		 2078static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
2079{
2080 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
2081 if (dev->addr_len != ARCNET_ALEN)
2082 return -1;
2083 memset(eui, 0, 7);
8e5e8f30 2084 eui[7] = *(u8 *)dev->dev_addr;
073a8e0e
YH		 2085 return 0;
2086}
2087
2088static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
2089{
2090 if (dev->addr_len != INFINIBAND_ALEN)
2091 return -1;
2092 memcpy(eui, dev->dev_addr + 12, 8);
2093 eui[0] |= 2;
2094 return 0;
2095}
2096
c61393ea 2097static int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
dfd982ba 2098{
9af28511
SH		 2099 if (addr == 0)
2100 return -1;
dfd982ba
YH		 2101 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
2102 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
2103 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
2104 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
2105 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
2106 ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
2107 eui[1] = 0;
2108 eui[2] = 0x5E;
2109 eui[3] = 0xFE;
2110 memcpy(eui + 4, &addr, 4);
2111 return 0;
2112}
dfd982ba
YH		 2113
2114static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
2115{
2116 if (dev->priv_flags & IFF_ISATAP)
2117 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
2118 return -1;
2119}
2120
aee80b54 2121static int addrconf_ifid_gre(u8 *eui, struct net_device *dev)
2122{
2123 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
2124}
2125
e837735e
ND		 2126static int addrconf_ifid_ip6tnl(u8 *eui, struct net_device *dev)
2127{
2128 memcpy(eui, dev->perm_addr, 3);
2129 memcpy(eui + 5, dev->perm_addr + 3, 3);
2130 eui[3] = 0xFF;
2131 eui[4] = 0xFE;
2132 eui[0] ^= 2;
2133 return 0;
2134}
2135
1da177e4
LT		 2136static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
2137{
2138 switch (dev->type) {
2139 case ARPHRD_ETHER:
2140 case ARPHRD_FDDI:
073a8e0e 2141 return addrconf_ifid_eui48(eui, dev);
1da177e4 2142 case ARPHRD_ARCNET:
073a8e0e 2143 return addrconf_ifid_arcnet(eui, dev);
1da177e4 2144 case ARPHRD_INFINIBAND:
073a8e0e 2145 return addrconf_ifid_infiniband(eui, dev);
c7dc89c0 2146 case ARPHRD_SIT:
dfd982ba 2147 return addrconf_ifid_sit(eui, dev);
aee80b54 2148 case ARPHRD_IPGRE:
45ce0fd1 2149 case ARPHRD_TUNNEL:
aee80b54 2150 return addrconf_ifid_gre(eui, dev);
e74bccb8 2151 case ARPHRD_6LOWPAN:
06a4c1c5 2152 return addrconf_ifid_eui64(eui, dev);
cb6bf355
YH		 2153 case ARPHRD_IEEE1394:
2154 return addrconf_ifid_ieee1394(eui, dev);
e837735e 2155 case ARPHRD_TUNNEL6:
45ce0fd1 2156 case ARPHRD_IP6GRE:
e837735e 2157 return addrconf_ifid_ip6tnl(eui, dev);
1da177e4
LT		 2158 }
2159 return -1;
2160}
2161
2162static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
2163{
2164 int err = -1;
2165 struct inet6_ifaddr *ifp;
2166
2167 read_lock_bh(&idev->lock);
602582ca
HFS		 2168 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
2169 if (ifp->scope > IFA_LINK)
2170 break;
1da177e4
LT		 2171 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
2172 memcpy(eui, ifp->addr.s6_addr+8, 8);
2173 err = 0;
2174 break;
2175 }
2176 }
2177 read_unlock_bh(&idev->lock);
2178 return err;
2179}
2180
1da177e4 2181/* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
9d6280da 2182static void ipv6_regen_rndid(struct inet6_dev *idev)
1da177e4 2183{
1da177e4 2184regen:
955189ef 2185 get_random_bytes(idev->rndid, sizeof(idev->rndid));
1da177e4 2186 idev->rndid[0] &= ~0x02;
1da177e4
LT		 2187
2188 /*
2189 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
2190 * check if generated address is not inappropriate
2191 *
2192 * - Reserved subnet anycast (RFC 2526)
2193 * 11111101 11....11 1xxxxxxx
c7dc89c0 2194 * - ISATAP (RFC4214) 6.1
1da177e4
LT		 2195 * 00-00-5E-FE-xx-xx-xx-xx
2196 * - value 0
2197 * - XXX: already assigned to an address on the device
2198 */
1ab1457c 2199 if (idev->rndid[0] == 0xfd &&
1da177e4
LT		 2200 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
2201 (idev->rndid[7]&0x80))
2202 goto regen;
2203 if ((idev->rndid[0]|idev->rndid[1]) == 0) {
2204 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
2205 goto regen;
2206 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
2207 goto regen;
2208 }
1da177e4
LT		 2209}
2210
9d6280da 2211static void ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr)
8e5e8f30 2212{
1da177e4 2213 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
9d6280da 2214 ipv6_regen_rndid(idev);
1da177e4 2215}
1da177e4
LT		 2216
2217/*
2218 * Add prefix route.
2219 */
2220
2221static void
2222addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
e431b8c0 2223 unsigned long expires, u32 flags)
1da177e4 2224{
86872cb5 2225 struct fib6_config cfg = {
ca254490 2226 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX,
86872cb5
TG		 2227 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2228 .fc_ifindex = dev->ifindex,
2229 .fc_expires = expires,
2230 .fc_dst_len = plen,
2231 .fc_flags = RTF_UP | flags,
c346dca1 2232 .fc_nlinfo.nl_net = dev_net(dev),
f410a1fb 2233 .fc_protocol = RTPROT_KERNEL,
86872cb5 2234 };
1da177e4 2235
4e3fd7a0 2236 cfg.fc_dst = *pfx;
1da177e4
LT		 2237
2238 /* Prevent useless cloning on PtP SIT.
2239 This thing is done here expecting that the whole
2240 class of non-broadcast devices need not cloning.
2241 */
07a93626 2242#if IS_ENABLED(CONFIG_IPV6_SIT)
86872cb5
TG		 2243 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
2244 cfg.fc_flags |= RTF_NONEXTHOP;
0be669bb 2245#endif
1da177e4 2246
86872cb5 2247 ip6_route_add(&cfg);
1da177e4
LT		 2248}
2249
14ef37b6
AH		 2250
2251static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
2252 int plen,
2253 const struct net_device *dev,
2254 u32 flags, u32 noflags)
2255{
2256 struct fib6_node *fn;
2257 struct rt6_info *rt = NULL;
2258 struct fib6_table *table;
ca254490 2259 u32 tb_id = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX;
14ef37b6 2260
ca254490 2261 table = fib6_get_table(dev_net(dev), tb_id);
63159f29 2262 if (!table)
14ef37b6
AH		 2263 return NULL;
2264
5744dd9b 2265 read_lock_bh(&table->tb6_lock);
14ef37b6
AH		 2266 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0);
2267 if (!fn)
2268 goto out;
1f56a01f
MKL		 2269
2270 noflags |= RTF_CACHE;
14ef37b6 2271 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
d1918542 2272 if (rt->dst.dev->ifindex != dev->ifindex)
14ef37b6
AH		 2273 continue;
2274 if ((rt->rt6i_flags & flags) != flags)
2275 continue;
85da53bf 2276 if ((rt->rt6i_flags & noflags) != 0)
14ef37b6
AH		 2277 continue;
2278 dst_hold(&rt->dst);
2279 break;
2280 }
2281out:
5744dd9b 2282 read_unlock_bh(&table->tb6_lock);
14ef37b6
AH		 2283 return rt;
2284}
2285
2286
1da177e4
LT		 2287/* Create "default" multicast route to the interface */
2288
2289static void addrconf_add_mroute(struct net_device *dev)
2290{
86872cb5 2291 struct fib6_config cfg = {
ca254490 2292 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_LOCAL,
86872cb5
TG		 2293 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2294 .fc_ifindex = dev->ifindex,
2295 .fc_dst_len = 8,
2296 .fc_flags = RTF_UP,
c346dca1 2297 .fc_nlinfo.nl_net = dev_net(dev),
86872cb5
TG		 2298 };
2299
2300 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
2301
2302 ip6_route_add(&cfg);
1da177e4
LT		 2303}
2304
1da177e4
LT		 2305static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
2306{
2307 struct inet6_dev *idev;
2308
2309 ASSERT_RTNL();
2310
e21e8467
SH		 2311 idev = ipv6_find_idev(dev);
2312 if (!idev)
64e724f6
BH		 2313 return ERR_PTR(-ENOBUFS);
2314
2315 if (idev->cnf.disable_ipv6)
2316 return ERR_PTR(-EACCES);
1da177e4
LT		 2317
2318 /* Add default multicast route */
ba46ee4c 2319 if (!(dev->flags & IFF_LOOPBACK) && !netif_is_l3_master(dev))
4af04aba 2320 addrconf_add_mroute(dev);
1da177e4 2321
1da177e4
LT		 2322 return idev;
2323}
2324
53bd6749
JP		 2325static void manage_tempaddrs(struct inet6_dev *idev,
2326 struct inet6_ifaddr *ifp,
2327 __u32 valid_lft, __u32 prefered_lft,
2328 bool create, unsigned long now)
2329{
2330 u32 flags;
2331 struct inet6_ifaddr *ift;
2332
2333 read_lock_bh(&idev->lock);
2334 /* update all temporary addresses in the list */
2335 list_for_each_entry(ift, &idev->tempaddr_list, tmp_list) {
2336 int age, max_valid, max_prefered;
2337
2338 if (ifp != ift->ifpub)
2339 continue;
2340
2341 /* RFC 4941 section 3.3:
2342 * If a received option will extend the lifetime of a public
2343 * address, the lifetimes of temporary addresses should
2344 * be extended, subject to the overall constraint that no
2345 * temporary addresses should ever remain "valid" or "preferred"
2346 * for a time longer than (TEMP_VALID_LIFETIME) or
2347 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), respectively.
2348 */
2349 age = (now - ift->cstamp) / HZ;
2350 max_valid = idev->cnf.temp_valid_lft - age;
2351 if (max_valid < 0)
2352 max_valid = 0;
2353
2354 max_prefered = idev->cnf.temp_prefered_lft -
76506a98 2355 idev->desync_factor - age;
53bd6749
JP		 2356 if (max_prefered < 0)
2357 max_prefered = 0;
2358
2359 if (valid_lft > max_valid)
2360 valid_lft = max_valid;
2361
2362 if (prefered_lft > max_prefered)
2363 prefered_lft = max_prefered;
2364
2365 spin_lock(&ift->lock);
2366 flags = ift->flags;
2367 ift->valid_lft = valid_lft;
2368 ift->prefered_lft = prefered_lft;
2369 ift->tstamp = now;
2370 if (prefered_lft > 0)
2371 ift->flags &= ~IFA_F_DEPRECATED;
2372
2373 spin_unlock(&ift->lock);
2374 if (!(flags&IFA_F_TENTATIVE))
2375 ipv6_ifa_notify(0, ift);
2376 }
2377
2378 if ((create || list_empty(&idev->tempaddr_list)) &&
2379 idev->cnf.use_tempaddr > 0) {
2380 /* When a new public address is created as described
2381 * in [ADDRCONF], also create a new temporary address.
2382 * Also create a temporary address if it's enabled but
2383 * no temporary address currently exists.
2384 */
2385 read_unlock_bh(&idev->lock);
2386 ipv6_create_tempaddr(ifp, NULL);
2387 } else {
2388 read_unlock_bh(&idev->lock);
2389 }
2390}
2391
cc9da6cc
BM		 2392static bool is_addr_mode_generate_stable(struct inet6_dev *idev)
2393{
d35a00b8
FJ		 2394 return idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY ||
2395 idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_RANDOM;
cc9da6cc
BM		 2396}
2397
cc84b3c6
AA		 2398int addrconf_prefix_rcv_add_addr(struct net *net, struct net_device *dev,
2399 const struct prefix_info *pinfo,
2400 struct inet6_dev *in6_dev,
2401 const struct in6_addr *addr, int addr_type,
2402 u32 addr_flags, bool sllao, bool tokenized,
2403 __u32 valid_lft, u32 prefered_lft)
4f672235
AA		 2404{
2405 struct inet6_ifaddr *ifp = ipv6_get_ifaddr(net, addr, dev, 1);
2406 int create = 0, update_lft = 0;
2407
2408 if (!ifp && valid_lft) {
2409 int max_addresses = in6_dev->cnf.max_addresses;
2410
2411#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2412 if (in6_dev->cnf.optimistic_dad &&
2413 !net->ipv6.devconf_all->forwarding && sllao)
2414 addr_flags |= IFA_F_OPTIMISTIC;
2415#endif
2416
2417 /* Do not allow to create too much of autoconfigured
2418 * addresses; this would be too easy way to crash kernel.
2419 */
2420 if (!max_addresses ||
2421 ipv6_count_addresses(in6_dev) < max_addresses)
2422 ifp = ipv6_add_addr(in6_dev, addr, NULL,
2423 pinfo->prefix_len,
2424 addr_type&IPV6_ADDR_SCOPE_MASK,
2425 addr_flags, valid_lft,
2426 prefered_lft);
2427
2428 if (IS_ERR_OR_NULL(ifp))
2429 return -1;
2430
2431 update_lft = 0;
2432 create = 1;
2433 spin_lock_bh(&ifp->lock);
2434 ifp->flags |= IFA_F_MANAGETEMPADDR;
2435 ifp->cstamp = jiffies;
2436 ifp->tokenized = tokenized;
2437 spin_unlock_bh(&ifp->lock);
2438 addrconf_dad_start(ifp);
2439 }
2440
2441 if (ifp) {
2442 u32 flags;
2443 unsigned long now;
2444 u32 stored_lft;
2445
2446 /* update lifetime (RFC2462 5.5.3 e) */
2447 spin_lock_bh(&ifp->lock);
2448 now = jiffies;
2449 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
2450 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
2451 else
2452 stored_lft = 0;
2453 if (!update_lft && !create && stored_lft) {
2454 const u32 minimum_lft = min_t(u32,
2455 stored_lft, MIN_VALID_LIFETIME);
2456 valid_lft = max(valid_lft, minimum_lft);
2457
2458 /* RFC4862 Section 5.5.3e:
2459 * "Note that the preferred lifetime of the
2460 * corresponding address is always reset to
2461 * the Preferred Lifetime in the received
2462 * Prefix Information option, regardless of
2463 * whether the valid lifetime is also reset or
2464 * ignored."
2465 *
2466 * So we should always update prefered_lft here.
2467 */
2468 update_lft = 1;
2469 }
2470
2471 if (update_lft) {
2472 ifp->valid_lft = valid_lft;
2473 ifp->prefered_lft = prefered_lft;
2474 ifp->tstamp = now;
2475 flags = ifp->flags;
2476 ifp->flags &= ~IFA_F_DEPRECATED;
2477 spin_unlock_bh(&ifp->lock);
2478
2479 if (!(flags&IFA_F_TENTATIVE))
2480 ipv6_ifa_notify(0, ifp);
2481 } else
2482 spin_unlock_bh(&ifp->lock);
2483
2484 manage_tempaddrs(in6_dev, ifp, valid_lft, prefered_lft,
2485 create, now);
2486
2487 in6_ifa_put(ifp);
2488 addrconf_verify();
2489 }
2490
2491 return 0;
2492}
cc84b3c6 2493EXPORT_SYMBOL_GPL(addrconf_prefix_rcv_add_addr);
4f672235 2494
e6bff995 2495void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao)
1da177e4
LT		 2496{
2497 struct prefix_info *pinfo;
2498 __u32 valid_lft;
2499 __u32 prefered_lft;
4f672235 2500 int addr_type, err;
64236f3f 2501 u32 addr_flags = 0;
1da177e4 2502 struct inet6_dev *in6_dev;
56d417b1 2503 struct net *net = dev_net(dev);
1da177e4
LT		 2504
2505 pinfo = (struct prefix_info *) opt;
1ab1457c 2506
1da177e4 2507 if (len < sizeof(struct prefix_info)) {
ba3542e1 2508 ADBG("addrconf: prefix option too short\n");
1da177e4
LT		 2509 return;
2510 }
1ab1457c 2511
1da177e4
LT		 2512 /*
2513 * Validation checks ([ADDRCONF], page 19)
2514 */
2515
2516 addr_type = ipv6_addr_type(&pinfo->prefix);
2517
2518 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
2519 return;
2520
2521 valid_lft = ntohl(pinfo->valid);
2522 prefered_lft = ntohl(pinfo->prefered);
2523
2524 if (prefered_lft > valid_lft) {
e87cc472 2525 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n");
1da177e4
LT		 2526 return;
2527 }
2528
2529 in6_dev = in6_dev_get(dev);
2530
63159f29 2531 if (!in6_dev) {
e87cc472
JP		 2532 net_dbg_ratelimited("addrconf: device %s not configured\n",
2533 dev->name);
1da177e4
LT		 2534 return;
2535 }
2536
2537 /*
2538 * Two things going on here:
2539 * 1) Add routes for on-link prefixes
2540 * 2) Configure prefixes with the auto flag set
2541 */
2542
4bed72e4
YH		 2543 if (pinfo->onlink) {
2544 struct rt6_info *rt;
2545 unsigned long rt_expires;
2546
6f704992
YH		 2547 /* Avoid arithmetic overflow. Really, we could
2548 * save rt_expires in seconds, likely valid_lft,
2549 * but it would require division in fib gc, that it
2550 * not good.
2551 */
4bed72e4
YH		 2552 if (HZ > USER_HZ)
2553 rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
2554 else
2555 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
3dd4bc68 2556
4bed72e4
YH		 2557 if (addrconf_finite_timeout(rt_expires))
2558 rt_expires *= HZ;
1da177e4 2559
14ef37b6
AH		 2560 rt = addrconf_get_prefix_route(&pinfo->prefix,
2561 pinfo->prefix_len,
2562 dev,
2563 RTF_ADDRCONF | RTF_PREFIX_RT,
2564 RTF_GATEWAY | RTF_DEFAULT);
1da177e4 2565
14ef37b6 2566 if (rt) {
6f704992
YH		 2567 /* Autoconf prefix route */
2568 if (valid_lft == 0) {
2569 ip6_del_rt(rt);
2570 rt = NULL;
4bed72e4 2571 } else if (addrconf_finite_timeout(rt_expires)) {
6f704992 2572 /* not infinity */
1716a961 2573 rt6_set_expires(rt, jiffies + rt_expires);
6f704992 2574 } else {
1716a961 2575 rt6_clean_expires(rt);
1da177e4
LT		 2576 }
2577 } else if (valid_lft) {
6f704992 2578 clock_t expires = 0;
4bed72e4
YH		 2579 int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
2580 if (addrconf_finite_timeout(rt_expires)) {
6f704992
YH		 2581 /* not infinity */
2582 flags |= RTF_EXPIRES;
2583 expires = jiffies_to_clock_t(rt_expires);
2584 }
1da177e4 2585 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
6f704992 2586 dev, expires, flags);
1da177e4 2587 }
94e187c0 2588 ip6_rt_put(rt);
1da177e4
LT		 2589 }
2590
2591 /* Try to figure out our local address for this prefix */
2592
2593 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
1da177e4 2594 struct in6_addr addr;
f997c55c 2595 bool tokenized = false, dev_addr_generated = false;
1da177e4
LT		 2596
2597 if (pinfo->prefix_len == 64) {
2598 memcpy(&addr, &pinfo->prefix, 8);
f53adae4
DB		 2599
2600 if (!ipv6_addr_any(&in6_dev->token)) {
2601 read_lock_bh(&in6_dev->lock);
2602 memcpy(addr.s6_addr + 8,
2603 in6_dev->token.s6_addr + 8, 8);
2604 read_unlock_bh(&in6_dev->lock);
617fe29d 2605 tokenized = true;
cc9da6cc 2606 } else if (is_addr_mode_generate_stable(in6_dev) &&
622c81d5
HFS		 2607 !ipv6_generate_stable_address(&addr, 0,
2608 in6_dev)) {
64236f3f 2609 addr_flags |= IFA_F_STABLE_PRIVACY;
622c81d5 2610 goto ok;
f53adae4
DB		 2611 } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
2612 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
4f672235 2613 goto put;
f997c55c
AA		 2614 } else {
2615 dev_addr_generated = true;
1da177e4
LT		 2616 }
2617 goto ok;
2618 }
e87cc472
JP		 2619 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n",
2620 pinfo->prefix_len);
4f672235 2621 goto put;
1da177e4
LT		 2622
2623ok:
4f672235
AA		 2624 err = addrconf_prefix_rcv_add_addr(net, dev, pinfo, in6_dev,
2625 &addr, addr_type,
2626 addr_flags, sllao,
2627 tokenized, valid_lft,
2628 prefered_lft);
2629 if (err)
2630 goto put;
f997c55c
AA		 2631
2632 /* Ignore error case here because previous prefix add addr was
2633 * successful which will be notified.
2634 */
2635 ndisc_ops_prefix_rcv_add_addr(net, dev, pinfo, in6_dev, &addr,
2636 addr_type, addr_flags, sllao,
2637 tokenized, valid_lft,
2638 prefered_lft,
2639 dev_addr_generated);
1da177e4
LT		 2640 }
2641 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
4f672235 2642put:
1da177e4
LT		 2643 in6_dev_put(in6_dev);
2644}
2645
2646/*
2647 * Set destination address.
2648 * Special case for SIT interfaces where we create a new "virtual"
2649 * device.
2650 */
af284937 2651int addrconf_set_dstaddr(struct net *net, void __user *arg)
1da177e4
LT		 2652{
2653 struct in6_ifreq ireq;
2654 struct net_device *dev;
2655 int err = -EINVAL;
2656
2657 rtnl_lock();
2658
2659 err = -EFAULT;
2660 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2661 goto err_exit;
2662
af284937 2663 dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
1da177e4
LT		 2664
2665 err = -ENODEV;
63159f29 2666 if (!dev)
1da177e4
LT		 2667 goto err_exit;
2668
07a93626 2669#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4 2670 if (dev->type == ARPHRD_SIT) {
5bc3eb7e 2671 const struct net_device_ops *ops = dev->netdev_ops;
1da177e4 2672 struct ifreq ifr;
1da177e4
LT		 2673 struct ip_tunnel_parm p;
2674
2675 err = -EADDRNOTAVAIL;
2676 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2677 goto err_exit;
2678
2679 memset(&p, 0, sizeof(p));
2680 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2681 p.iph.saddr = 0;
2682 p.iph.version = 4;
2683 p.iph.ihl = 5;
2684 p.iph.protocol = IPPROTO_IPV6;
2685 p.iph.ttl = 64;
d20b3109 2686 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
1da177e4 2687
5bc3eb7e
SH		 2688 if (ops->ndo_do_ioctl) {
2689 mm_segment_t oldfs = get_fs();
2690
2691 set_fs(KERNEL_DS);
2692 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2693 set_fs(oldfs);
2694 } else
2695 err = -EOPNOTSUPP;
1da177e4
LT		 2696
2697 if (err == 0) {
2698 err = -ENOBUFS;
af284937
DL		 2699 dev = __dev_get_by_name(net, p.name);
2700 if (!dev)
1da177e4
LT		 2701 goto err_exit;
2702 err = dev_open(dev);
2703 }
2704 }
0be669bb 2705#endif
1da177e4
LT		 2706
2707err_exit:
2708 rtnl_unlock();
2709 return err;
2710}
2711
93a714d6
MC		 2712static int ipv6_mc_config(struct sock *sk, bool join,
2713 const struct in6_addr *addr, int ifindex)
2714{
2715 int ret;
2716
2717 ASSERT_RTNL();
2718
2719 lock_sock(sk);
2720 if (join)
54ff9ef3 2721 ret = ipv6_sock_mc_join(sk, ifindex, addr);
93a714d6 2722 else
54ff9ef3 2723 ret = ipv6_sock_mc_drop(sk, ifindex, addr);
93a714d6
MC		 2724 release_sock(sk);
2725
2726 return ret;
2727}
2728
1da177e4
LT		 2729/*
2730 * Manual configuration of address on an interface
2731 */
479840ff
JP		 2732static int inet6_addr_add(struct net *net, int ifindex,
2733 const struct in6_addr *pfx,
caeaba79 2734 const struct in6_addr *peer_pfx,
479840ff
JP		 2735 unsigned int plen, __u32 ifa_flags,
2736 __u32 prefered_lft, __u32 valid_lft)
1da177e4
LT		 2737{
2738 struct inet6_ifaddr *ifp;
2739 struct inet6_dev *idev;
2740 struct net_device *dev;
93a714d6
MC		 2741 unsigned long timeout;
2742 clock_t expires;
1da177e4 2743 int scope;
6f704992 2744 u32 flags;
1da177e4
LT		 2745
2746 ASSERT_RTNL();
1ab1457c 2747
24ef0da7
TG		 2748 if (plen > 128)
2749 return -EINVAL;
2750
0778769d
NT		 2751 /* check the lifetime */
2752 if (!valid_lft || prefered_lft > valid_lft)
2753 return -EINVAL;
2754
53bd6749
JP		 2755 if (ifa_flags & IFA_F_MANAGETEMPADDR && plen != 64)
2756 return -EINVAL;
2757
af284937
DL		 2758 dev = __dev_get_by_index(net, ifindex);
2759 if (!dev)
1da177e4 2760 return -ENODEV;
1ab1457c 2761
64e724f6
BH		 2762 idev = addrconf_add_dev(dev);
2763 if (IS_ERR(idev))
2764 return PTR_ERR(idev);
1da177e4 2765
93a714d6
MC		 2766 if (ifa_flags & IFA_F_MCAUTOJOIN) {
2767 int ret = ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2768 true, pfx, ifindex);
2769
2770 if (ret < 0)
2771 return ret;
2772 }
2773
1da177e4
LT		 2774 scope = ipv6_addr_scope(pfx);
2775
4bed72e4
YH		 2776 timeout = addrconf_timeout_fixup(valid_lft, HZ);
2777 if (addrconf_finite_timeout(timeout)) {
2778 expires = jiffies_to_clock_t(timeout * HZ);
2779 valid_lft = timeout;
6f704992 2780 flags = RTF_EXPIRES;
4bed72e4
YH		 2781 } else {
2782 expires = 0;
2783 flags = 0;
2784 ifa_flags |= IFA_F_PERMANENT;
6f704992 2785 }
0778769d 2786
4bed72e4
YH		 2787 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
2788 if (addrconf_finite_timeout(timeout)) {
2789 if (timeout == 0)
2790 ifa_flags |= IFA_F_DEPRECATED;
2791 prefered_lft = timeout;
2792 }
0778769d 2793
8a226b2c
JB		 2794 ifp = ipv6_add_addr(idev, pfx, peer_pfx, plen, scope, ifa_flags,
2795 valid_lft, prefered_lft);
0778769d 2796
1da177e4 2797 if (!IS_ERR(ifp)) {
761aac73
TH		 2798 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) {
2799 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
2800 expires, flags);
2801 }
2802
95c385b4
NH		 2803 /*
2804 * Note that section 3.1 of RFC 4429 indicates
2805 * that the Optimistic flag should not be set for
2806 * manually configured addresses
2807 */
cf22f9a2 2808 addrconf_dad_start(ifp);
53bd6749
JP		 2809 if (ifa_flags & IFA_F_MANAGETEMPADDR)
2810 manage_tempaddrs(idev, ifp, valid_lft, prefered_lft,
2811 true, jiffies);
1da177e4 2812 in6_ifa_put(ifp);
c15b1cca 2813 addrconf_verify_rtnl();
1da177e4 2814 return 0;
93a714d6
MC		 2815 } else if (ifa_flags & IFA_F_MCAUTOJOIN) {
2816 ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2817 false, pfx, ifindex);
1da177e4
LT		 2818 }
2819
2820 return PTR_ERR(ifp);
2821}
2822
6046d5b4
HK		 2823static int inet6_addr_del(struct net *net, int ifindex, u32 ifa_flags,
2824 const struct in6_addr *pfx, unsigned int plen)
1da177e4
LT		 2825{
2826 struct inet6_ifaddr *ifp;
2827 struct inet6_dev *idev;
2828 struct net_device *dev;
1ab1457c 2829
24ef0da7
TG		 2830 if (plen > 128)
2831 return -EINVAL;
2832
af284937
DL		 2833 dev = __dev_get_by_index(net, ifindex);
2834 if (!dev)
1da177e4
LT		 2835 return -ENODEV;
2836
e5d08d71 2837 idev = __in6_dev_get(dev);
63159f29 2838 if (!idev)
1da177e4
LT		 2839 return -ENXIO;
2840
2841 read_lock_bh(&idev->lock);
502a2ffd 2842 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1da177e4
LT		 2843 if (ifp->prefix_len == plen &&
2844 ipv6_addr_equal(pfx, &ifp->addr)) {
2845 in6_ifa_hold(ifp);
2846 read_unlock_bh(&idev->lock);
1ab1457c 2847
6046d5b4
HK		 2848 if (!(ifp->flags & IFA_F_TEMPORARY) &&
2849 (ifa_flags & IFA_F_MANAGETEMPADDR))
2850 manage_tempaddrs(idev, ifp, 0, 0, false,
2851 jiffies);
1da177e4 2852 ipv6_del_addr(ifp);
6046d5b4 2853 addrconf_verify_rtnl();
93a714d6
MC		 2854 if (ipv6_addr_is_multicast(pfx)) {
2855 ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2856 false, pfx, dev->ifindex);
2857 }
1da177e4
LT		 2858 return 0;
2859 }
2860 }
2861 read_unlock_bh(&idev->lock);
2862 return -EADDRNOTAVAIL;
2863}
2864
2865
af284937 2866int addrconf_add_ifaddr(struct net *net, void __user *arg)
1da177e4
LT		 2867{
2868 struct in6_ifreq ireq;
2869 int err;
1ab1457c 2870
af31f412 2871 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1da177e4 2872 return -EPERM;
1ab1457c 2873
1da177e4
LT		 2874 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2875 return -EFAULT;
2876
2877 rtnl_lock();
caeaba79 2878 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, NULL,
af284937
DL		 2879 ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2880 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
1da177e4
LT		 2881 rtnl_unlock();
2882 return err;
2883}
2884
af284937 2885int addrconf_del_ifaddr(struct net *net, void __user *arg)
1da177e4
LT		 2886{
2887 struct in6_ifreq ireq;
2888 int err;
1ab1457c 2889
af31f412 2890 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1da177e4
LT		 2891 return -EPERM;
2892
2893 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2894 return -EFAULT;
2895
2896 rtnl_lock();
6046d5b4 2897 err = inet6_addr_del(net, ireq.ifr6_ifindex, 0, &ireq.ifr6_addr,
af284937 2898 ireq.ifr6_prefixlen);
1da177e4
LT		 2899 rtnl_unlock();
2900 return err;
2901}
2902
b5f348e5
IJ		 2903static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
2904 int plen, int scope)
2905{
2906 struct inet6_ifaddr *ifp;
2907
8a226b2c 2908 ifp = ipv6_add_addr(idev, addr, NULL, plen,
07edd741
HFS		 2909 scope, IFA_F_PERMANENT,
2910 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
b5f348e5
IJ		 2911 if (!IS_ERR(ifp)) {
2912 spin_lock_bh(&ifp->lock);
2913 ifp->flags &= ~IFA_F_TENTATIVE;
2914 spin_unlock_bh(&ifp->lock);
764d3be6 2915 rt_genid_bump_ipv6(dev_net(idev->dev));
b5f348e5
IJ		 2916 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2917 in6_ifa_put(ifp);
2918 }
2919}
2920
07a93626 2921#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4
LT		 2922static void sit_add_v4_addrs(struct inet6_dev *idev)
2923{
1da177e4
LT		 2924 struct in6_addr addr;
2925 struct net_device *dev;
c346dca1 2926 struct net *net = dev_net(idev->dev);
929c9cf3 2927 int scope, plen;
f0e2acfa 2928 u32 pflags = 0;
1da177e4
LT		 2929
2930 ASSERT_RTNL();
2931
2932 memset(&addr, 0, sizeof(struct in6_addr));
2933 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2934
2935 if (idev->dev->flags&IFF_POINTOPOINT) {
2936 addr.s6_addr32[0] = htonl(0xfe800000);
2937 scope = IFA_LINK;
929c9cf3 2938 plen = 64;
1da177e4
LT		 2939 } else {
2940 scope = IPV6_ADDR_COMPATv4;
929c9cf3 2941 plen = 96;
f0e2acfa 2942 pflags |= RTF_NONEXTHOP;
1da177e4
LT		 2943 }
2944
2945 if (addr.s6_addr32[3]) {
929c9cf3 2946 add_addr(idev, &addr, plen, scope);
f0e2acfa 2947 addrconf_prefix_route(&addr, plen, idev->dev, 0, pflags);
1da177e4
LT		 2948 return;
2949 }
2950
6fda7350 2951 for_each_netdev(net, dev) {
8e5e8f30 2952 struct in_device *in_dev = __in_dev_get_rtnl(dev);
1da177e4 2953 if (in_dev && (dev->flags & IFF_UP)) {
8e5e8f30 2954 struct in_ifaddr *ifa;
1da177e4
LT		 2955
2956 int flag = scope;
2957
2958 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
1da177e4
LT		 2959
2960 addr.s6_addr32[3] = ifa->ifa_local;
2961
2962 if (ifa->ifa_scope == RT_SCOPE_LINK)
2963 continue;
2964 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2965 if (idev->dev->flags&IFF_POINTOPOINT)
2966 continue;
2967 flag |= IFA_HOST;
2968 }
1da177e4 2969
b5f348e5 2970 add_addr(idev, &addr, plen, flag);
f0e2acfa
ND		 2971 addrconf_prefix_route(&addr, plen, idev->dev, 0,
2972 pflags);
1da177e4
LT		 2973 }
2974 }
1ab1457c 2975 }
1da177e4 2976}
0be669bb 2977#endif
1da177e4
LT		 2978
2979static void init_loopback(struct net_device *dev)
2980{
2981 struct inet6_dev *idev;
25fb6ca4
BK		 2982 struct net_device *sp_dev;
2983 struct inet6_ifaddr *sp_ifa;
2984 struct rt6_info *sp_rt;
1da177e4
LT		 2985
2986 /* ::1 */
2987
2988 ASSERT_RTNL();
2989
e5d08d71 2990 idev = ipv6_find_idev(dev);
63159f29 2991 if (!idev) {
91df42be 2992 pr_debug("%s: add_dev failed\n", __func__);
1da177e4
LT		 2993 return;
2994 }
2995
b5f348e5 2996 add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
25fb6ca4
BK		 2997
2998 /* Add routes to other interface's IPv6 addresses */
2999 for_each_netdev(dev_net(dev), sp_dev) {
3000 if (!strcmp(sp_dev->name, dev->name))
3001 continue;
3002
3003 idev = __in6_dev_get(sp_dev);
3004 if (!idev)
3005 continue;
3006
3007 read_lock_bh(&idev->lock);
3008 list_for_each_entry(sp_ifa, &idev->addr_list, if_list) {
3009
3010 if (sp_ifa->flags & (IFA_F_DADFAILED | IFA_F_TENTATIVE))
3011 continue;
3012
33d99113
G		 3013 if (sp_ifa->rt) {
3014 /* This dst has been added to garbage list when
3015 * lo device down, release this obsolete dst and
3016 * reallocate a new router for ifa.
3017 */
a220445f 3018 if (!atomic_read(&sp_ifa->rt->rt6i_ref)) {
33d99113
G		 3019 ip6_rt_put(sp_ifa->rt);
3020 sp_ifa->rt = NULL;
3021 } else {
3022 continue;
3023 }
3024 }
a881ae1f 3025
57ec0afe 3026 sp_rt = addrconf_dst_alloc(idev, &sp_ifa->addr, false);
25fb6ca4
BK		 3027
3028 /* Failure cases are ignored */
534c8779
G		 3029 if (!IS_ERR(sp_rt)) {
3030 sp_ifa->rt = sp_rt;
25fb6ca4 3031 ip6_ins_rt(sp_rt);
534c8779 3032 }
25fb6ca4
BK		 3033 }
3034 read_unlock_bh(&idev->lock);
3035 }
1da177e4
LT		 3036}
3037
2ad3ed59
AA		 3038void addrconf_add_linklocal(struct inet6_dev *idev,
3039 const struct in6_addr *addr, u32 flags)
1da177e4 3040{
8e5e8f30 3041 struct inet6_ifaddr *ifp;
64236f3f 3042 u32 addr_flags = flags | IFA_F_PERMANENT;
95c385b4
NH		 3043
3044#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
3045 if (idev->cnf.optimistic_dad &&
702beb87 3046 !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
95c385b4
NH		 3047 addr_flags |= IFA_F_OPTIMISTIC;
3048#endif
1da177e4 3049
07edd741
HFS		 3050 ifp = ipv6_add_addr(idev, addr, NULL, 64, IFA_LINK, addr_flags,
3051 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
1da177e4 3052 if (!IS_ERR(ifp)) {
46d48046 3053 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
cf22f9a2 3054 addrconf_dad_start(ifp);
1da177e4
LT		 3055 in6_ifa_put(ifp);
3056 }
3057}
2ad3ed59 3058EXPORT_SYMBOL_GPL(addrconf_add_linklocal);
1da177e4 3059
622c81d5
HFS		 3060static bool ipv6_reserved_interfaceid(struct in6_addr address)
3061{
3062 if ((address.s6_addr32[2] | address.s6_addr32[3]) == 0)
3063 return true;
3064
3065 if (address.s6_addr32[2] == htonl(0x02005eff) &&
3066 ((address.s6_addr32[3] & htonl(0xfe000000)) == htonl(0xfe000000)))
3067 return true;
3068
3069 if (address.s6_addr32[2] == htonl(0xfdffffff) &&
3070 ((address.s6_addr32[3] & htonl(0xffffff80)) == htonl(0xffffff80)))
3071 return true;
3072
3073 return false;
3074}
3075
3076static int ipv6_generate_stable_address(struct in6_addr *address,
3077 u8 dad_count,
3078 const struct inet6_dev *idev)
3079{
622c81d5
HFS		 3080 static DEFINE_SPINLOCK(lock);
3081 static __u32 digest[SHA_DIGEST_WORDS];
3082 static __u32 workspace[SHA_WORKSPACE_WORDS];
3083
3084 static union {
3085 char __data[SHA_MESSAGE_BYTES];
3086 struct {
3087 struct in6_addr secret;
ff40217e 3088 __be32 prefix[2];
622c81d5
HFS		 3089 unsigned char hwaddr[MAX_ADDR_LEN];
3090 u8 dad_count;
3091 } __packed;
3092 } data;
3093
3094 struct in6_addr secret;
3095 struct in6_addr temp;
3096 struct net *net = dev_net(idev->dev);
3097
3098 BUILD_BUG_ON(sizeof(data.__data) != sizeof(data));
3099
3100 if (idev->cnf.stable_secret.initialized)
3101 secret = idev->cnf.stable_secret.secret;
3102 else if (net->ipv6.devconf_dflt->stable_secret.initialized)
3103 secret = net->ipv6.devconf_dflt->stable_secret.secret;
3104 else
3105 return -1;
3106
3107retry:
3108 spin_lock_bh(&lock);
3109
3110 sha_init(digest);
3111 memset(&data, 0, sizeof(data));
3112 memset(workspace, 0, sizeof(workspace));
3113 memcpy(data.hwaddr, idev->dev->perm_addr, idev->dev->addr_len);
ff40217e
HFS		 3114 data.prefix[0] = address->s6_addr32[0];
3115 data.prefix[1] = address->s6_addr32[1];
622c81d5
HFS		 3116 data.secret = secret;
3117 data.dad_count = dad_count;
3118
3119 sha_transform(digest, data.__data, workspace);
3120
3121 temp = *address;
ff40217e
HFS		 3122 temp.s6_addr32[2] = (__force __be32)digest[0];
3123 temp.s6_addr32[3] = (__force __be32)digest[1];
622c81d5
HFS		 3124
3125 spin_unlock_bh(&lock);
3126
3127 if (ipv6_reserved_interfaceid(temp)) {
3128 dad_count++;
1855b7c3 3129 if (dad_count > dev_net(idev->dev)->ipv6.sysctl.idgen_retries)
622c81d5
HFS		 3130 return -1;
3131 goto retry;
3132 }
3133
3134 *address = temp;
3135 return 0;
3136}
3137
cc9da6cc
BM		 3138static void ipv6_gen_mode_random_init(struct inet6_dev *idev)
3139{
3140 struct ipv6_stable_secret *s = &idev->cnf.stable_secret;
3141
3142 if (s->initialized)
3143 return;
3144 s = &idev->cnf.stable_secret;
3145 get_random_bytes(&s->secret, sizeof(s->secret));
3146 s->initialized = true;
3147}
3148
bc91b0f0
JP		 3149static void addrconf_addr_gen(struct inet6_dev *idev, bool prefix_route)
3150{
622c81d5
HFS		 3151 struct in6_addr addr;
3152
ca254490
DA		 3153 /* no link local addresses on L3 master devices */
3154 if (netif_is_l3_master(idev->dev))
3155 return;
3156
622c81d5 3157 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
bc91b0f0 3158
d35a00b8 3159 switch (idev->cnf.addr_gen_mode) {
cc9da6cc
BM		 3160 case IN6_ADDR_GEN_MODE_RANDOM:
3161 ipv6_gen_mode_random_init(idev);
3162 /* fallthrough */
3163 case IN6_ADDR_GEN_MODE_STABLE_PRIVACY:
622c81d5 3164 if (!ipv6_generate_stable_address(&addr, 0, idev))
64236f3f
HFS		 3165 addrconf_add_linklocal(idev, &addr,
3166 IFA_F_STABLE_PRIVACY);
622c81d5
HFS		 3167 else if (prefix_route)
3168 addrconf_prefix_route(&addr, 64, idev->dev, 0, 0);
cc9da6cc
BM		 3169 break;
3170 case IN6_ADDR_GEN_MODE_EUI64:
bc91b0f0
JP		 3171 /* addrconf_add_linklocal also adds a prefix_route and we
3172 * only need to care about prefix routes if ipv6_generate_eui64
3173 * couldn't generate one.
3174 */
3175 if (ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) == 0)
64236f3f 3176 addrconf_add_linklocal(idev, &addr, 0);
bc91b0f0
JP		 3177 else if (prefix_route)
3178 addrconf_prefix_route(&addr, 64, idev->dev, 0, 0);
cc9da6cc
BM		 3179 break;
3180 case IN6_ADDR_GEN_MODE_NONE:
3181 default:
3182 /* will not add any link local address */
3183 break;
bc91b0f0
JP		 3184 }
3185}
3186
1da177e4
LT		 3187static void addrconf_dev_config(struct net_device *dev)
3188{
8e5e8f30 3189 struct inet6_dev *idev;
1da177e4
LT		 3190
3191 ASSERT_RTNL();
3192
74235a25
HX		 3193 if ((dev->type != ARPHRD_ETHER) &&
3194 (dev->type != ARPHRD_FDDI) &&
74235a25 3195 (dev->type != ARPHRD_ARCNET) &&
06a4c1c5 3196 (dev->type != ARPHRD_INFINIBAND) &&
e837735e 3197 (dev->type != ARPHRD_IEEE1394) &&
e74bccb8 3198 (dev->type != ARPHRD_TUNNEL6) &&
cc9da6cc 3199 (dev->type != ARPHRD_6LOWPAN) &&
45ce0fd1
FJ		 3200 (dev->type != ARPHRD_IP6GRE) &&
3201 (dev->type != ARPHRD_IPGRE) &&
3202 (dev->type != ARPHRD_TUNNEL) &&
cc9da6cc 3203 (dev->type != ARPHRD_NONE)) {
74235a25
HX		 3204 /* Alas, we support only Ethernet autoconfiguration. */
3205 return;
3206 }
3207
1da177e4 3208 idev = addrconf_add_dev(dev);
64e724f6 3209 if (IS_ERR(idev))
1da177e4
LT		 3210 return;
3211
cc9da6cc
BM		 3212 /* this device type has no EUI support */
3213 if (dev->type == ARPHRD_NONE &&
d35a00b8
FJ		 3214 idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_EUI64)
3215 idev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_RANDOM;
cc9da6cc 3216
bc91b0f0 3217 addrconf_addr_gen(idev, false);
1da177e4
LT		 3218}
3219
07a93626 3220#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4
LT		 3221static void addrconf_sit_config(struct net_device *dev)
3222{
3223 struct inet6_dev *idev;
3224
3225 ASSERT_RTNL();
3226
1ab1457c
YH		 3227 /*
3228 * Configure the tunnel with one of our IPv4
3229 * addresses... we should configure all of
1da177e4
LT		 3230 * our v4 addrs in the tunnel
3231 */
3232
e5d08d71 3233 idev = ipv6_find_idev(dev);
63159f29 3234 if (!idev) {
91df42be 3235 pr_debug("%s: add_dev failed\n", __func__);
1da177e4
LT		 3236 return;
3237 }
3238
c7dc89c0 3239 if (dev->priv_flags & IFF_ISATAP) {
bc91b0f0 3240 addrconf_addr_gen(idev, false);
c7dc89c0
FT		 3241 return;
3242 }
3243
1da177e4
LT		 3244 sit_add_v4_addrs(idev);
3245
62b54dd9 3246 if (dev->flags&IFF_POINTOPOINT)
1da177e4 3247 addrconf_add_mroute(dev);
1da177e4 3248}
0be669bb 3249#endif
1da177e4 3250
07a93626 3251#if IS_ENABLED(CONFIG_NET_IPGRE)
aee80b54 3252static void addrconf_gre_config(struct net_device *dev)
3253{
3254 struct inet6_dev *idev;
aee80b54 3255
aee80b54 3256 ASSERT_RTNL();
3257
e5d08d71 3258 idev = ipv6_find_idev(dev);
63159f29 3259 if (!idev) {
91df42be 3260 pr_debug("%s: add_dev failed\n", __func__);
aee80b54 3261 return;
3262 }
3263
bc91b0f0 3264 addrconf_addr_gen(idev, true);
d9e4ce65
HFS		 3265 if (dev->flags & IFF_POINTOPOINT)
3266 addrconf_add_mroute(dev);
aee80b54 3267}
3268#endif
3269
f1705ec1
DA		 3270static int fixup_permanent_addr(struct inet6_dev *idev,
3271 struct inet6_ifaddr *ifp)
3272{
3273 if (!ifp->rt) {
3274 struct rt6_info *rt;
3275
3276 rt = addrconf_dst_alloc(idev, &ifp->addr, false);
3277 if (unlikely(IS_ERR(rt)))
3278 return PTR_ERR(rt);
3279
3280 ifp->rt = rt;
3281 }
3282
3283 if (!(ifp->flags & IFA_F_NOPREFIXROUTE)) {
3284 addrconf_prefix_route(&ifp->addr, ifp->prefix_len,
3285 idev->dev, 0, 0);
3286 }
3287
3288 addrconf_dad_start(ifp);
3289
3290 return 0;
3291}
3292
3293static void addrconf_permanent_addr(struct net_device *dev)
3294{
3295 struct inet6_ifaddr *ifp, *tmp;
3296 struct inet6_dev *idev;
3297
3298 idev = __in6_dev_get(dev);
3299 if (!idev)
3300 return;
3301
3302 write_lock_bh(&idev->lock);
3303
3304 list_for_each_entry_safe(ifp, tmp, &idev->addr_list, if_list) {
3305 if ((ifp->flags & IFA_F_PERMANENT) &&
3306 fixup_permanent_addr(idev, ifp) < 0) {
3307 write_unlock_bh(&idev->lock);
3308 ipv6_del_addr(ifp);
3309 write_lock_bh(&idev->lock);
3310
3311 net_info_ratelimited("%s: Failed to add prefix route for address %pI6c; dropping\n",
3312 idev->dev->name, &ifp->addr);
3313 }
3314 }
3315
3316 write_unlock_bh(&idev->lock);
3317}
3318
1ab1457c 3319static int addrconf_notify(struct notifier_block *this, unsigned long event,
351638e7 3320 void *ptr)
1da177e4 3321{
351638e7 3322 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
4f7f34ea 3323 struct netdev_notifier_changeupper_info *info;
748e2d93 3324 struct inet6_dev *idev = __in6_dev_get(dev);
c5e33bdd 3325 int run_pending = 0;
b217d616 3326 int err;
1da177e4 3327
e21e8467 3328 switch (event) {
45ba9dd2 3329 case NETDEV_REGISTER:
74235a25 3330 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
45ba9dd2 3331 idev = ipv6_add_dev(dev);
a317a2f1
WC		 3332 if (IS_ERR(idev))
3333 return notifier_from_errno(PTR_ERR(idev));
45ba9dd2
YH		 3334 }
3335 break;
bcdd553f 3336
b7b0b1d2
AD		 3337 case NETDEV_CHANGEMTU:
3338 /* if MTU under IPV6_MIN_MTU stop IPv6 on this interface. */
3339 if (dev->mtu < IPV6_MIN_MTU) {
3340 addrconf_ifdown(dev, 1);
3341 break;
3342 }
3343
3344 if (idev) {
3345 rt6_mtu_change(dev, dev->mtu);
3346 idev->cnf.mtu6 = dev->mtu;
3347 break;
3348 }
3349
3350 /* allocate new idev */
3351 idev = ipv6_add_dev(dev);
3352 if (IS_ERR(idev))
3353 break;
3354
3355 /* device is still not ready */
3356 if (!(idev->if_flags & IF_READY))
3357 break;
3358
3359 run_pending = 1;
3360
3361 /* fall through */
3362
1da177e4 3363 case NETDEV_UP:
3c21edbd 3364 case NETDEV_CHANGE:
c2edacf8
JV		 3365 if (dev->flags & IFF_SLAVE)
3366 break;
3367
3ce62a84
WC		 3368 if (idev && idev->cnf.disable_ipv6)
3369 break;
3370
3c21edbd 3371 if (event == NETDEV_UP) {
38bd10c4
DA		 3372 /* restore routes for permanent addresses */
3373 addrconf_permanent_addr(dev);
3374
f24e3d65 3375 if (!addrconf_qdisc_ok(dev)) {
3c21edbd 3376 /* device is not ready yet. */
f3213831 3377 pr_info("ADDRCONF(NETDEV_UP): %s: link is not ready\n",
3c21edbd
YH		 3378 dev->name);
3379 break;
3380 }
99081049 3381
d31c7b8f
EP		 3382 if (!idev && dev->mtu >= IPV6_MIN_MTU)
3383 idev = ipv6_add_dev(dev);
3384
a317a2f1 3385 if (!IS_ERR_OR_NULL(idev)) {
99081049 3386 idev->if_flags |= IF_READY;
e3ec6cfc
BT		 3387 run_pending = 1;
3388 }
b7b0b1d2 3389 } else if (event == NETDEV_CHANGE) {
f24e3d65 3390 if (!addrconf_qdisc_ok(dev)) {
3c21edbd
YH		 3391 /* device is still not ready. */
3392 break;
3393 }
3394
3395 if (idev) {
bcdd553f 3396 if (idev->if_flags & IF_READY)
3c21edbd
YH		 3397 /* device is already configured. */
3398 break;
3c21edbd
YH		 3399 idev->if_flags |= IF_READY;
3400 }
3401
f3213831
JP		 3402 pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n",
3403 dev->name);
3c21edbd 3404
c5e33bdd 3405 run_pending = 1;
3c21edbd
YH		 3406 }
3407
e21e8467 3408 switch (dev->type) {
07a93626 3409#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4
LT		 3410 case ARPHRD_SIT:
3411 addrconf_sit_config(dev);
3412 break;
aee80b54 3413#endif
07a93626 3414#if IS_ENABLED(CONFIG_NET_IPGRE)
aee80b54 3415 case ARPHRD_IPGRE:
3416 addrconf_gre_config(dev);
3417 break;
0be669bb 3418#endif
1da177e4
LT		 3419 case ARPHRD_LOOPBACK:
3420 init_loopback(dev);
3421 break;
3422
3423 default:
3424 addrconf_dev_config(dev);
3425 break;
3ff50b79 3426 }
bcdd553f 3427
a317a2f1 3428 if (!IS_ERR_OR_NULL(idev)) {
c5e33bdd
YH		 3429 if (run_pending)
3430 addrconf_dad_run(idev);
3431
bcdd553f
SH		 3432 /*
3433 * If the MTU changed during the interface down,
3434 * when the interface up, the changed MTU must be
3435 * reflected in the idev as well as routers.
1da177e4 3436 */
bcdd553f
SH		 3437 if (idev->cnf.mtu6 != dev->mtu &&
3438 dev->mtu >= IPV6_MIN_MTU) {
1da177e4
LT		 3439 rt6_mtu_change(dev, dev->mtu);
3440 idev->cnf.mtu6 = dev->mtu;
3441 }
3442 idev->tstamp = jiffies;
3443 inet6_ifinfo_notify(RTM_NEWLINK, idev);
bcdd553f
SH		 3444
3445 /*
3446 * If the changed mtu during down is lower than
3447 * IPV6_MIN_MTU stop IPv6 on this interface.
1da177e4
LT		 3448 */
3449 if (dev->mtu < IPV6_MIN_MTU)
bcdd553f 3450 addrconf_ifdown(dev, 1);
1da177e4
LT		 3451 }
3452 break;
3453
1da177e4
LT		 3454 case NETDEV_DOWN:
3455 case NETDEV_UNREGISTER:
3456 /*
3457 * Remove all addresses from this interface.
3458 */
3459 addrconf_ifdown(dev, event != NETDEV_DOWN);
3460 break;
3c21edbd 3461
1da177e4 3462 case NETDEV_CHANGENAME:
1da177e4 3463 if (idev) {
5632c515 3464 snmp6_unregister_dev(idev);
408c4768 3465 addrconf_sysctl_unregister(idev);
a317a2f1 3466 err = addrconf_sysctl_register(idev);
b217d616
HX		 3467 if (err)
3468 return notifier_from_errno(err);
a317a2f1
WC		 3469 err = snmp6_register_dev(idev);
3470 if (err) {
3471 addrconf_sysctl_unregister(idev);
3472 return notifier_from_errno(err);
3473 }
5632c515 3474 }
1da177e4 3475 break;
bcdd553f 3476
93d9b7d7
JP		 3477 case NETDEV_PRE_TYPE_CHANGE:
3478 case NETDEV_POST_TYPE_CHANGE:
3ef0952c
AL		 3479 if (idev)
3480 addrconf_type_change(dev, event);
75c78500 3481 break;
4f7f34ea
DA		 3482
3483 case NETDEV_CHANGEUPPER:
3484 info = ptr;
3485
3486 /* flush all routes if dev is linked to or unlinked from
3487 * an L3 master device (e.g., VRF)
3488 */
3489 if (info->upper_dev && netif_is_l3_master(info->upper_dev))
3490 addrconf_ifdown(dev, 0);
3ff50b79 3491 }
1da177e4
LT		 3492
3493 return NOTIFY_OK;
3494}
3495
3496/*
3497 * addrconf module should be notified of a device going up
3498 */
3499static struct notifier_block ipv6_dev_notf = {
3500 .notifier_call = addrconf_notify,
1da177e4
LT		 3501};
3502
93d9b7d7 3503static void addrconf_type_change(struct net_device *dev, unsigned long event)
75c78500
MS		 3504{
3505 struct inet6_dev *idev;
3506 ASSERT_RTNL();
3507
3508 idev = __in6_dev_get(dev);
3509
93d9b7d7 3510 if (event == NETDEV_POST_TYPE_CHANGE)
75c78500 3511 ipv6_mc_remap(idev);
93d9b7d7 3512 else if (event == NETDEV_PRE_TYPE_CHANGE)
75c78500
MS		 3513 ipv6_mc_unmap(idev);
3514}
3515
70af921d
DA		 3516static bool addr_is_local(const struct in6_addr *addr)
3517{
3518 return ipv6_addr_type(addr) &
3519 (IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK);
3520}
3521
1da177e4
LT		 3522static int addrconf_ifdown(struct net_device *dev, int how)
3523{
c346dca1 3524 struct net *net = dev_net(dev);
502a2ffd 3525 struct inet6_dev *idev;
f1705ec1
DA		 3526 struct inet6_ifaddr *ifa, *tmp;
3527 struct list_head del_list;
3528 int _keep_addr;
3529 bool keep_addr;
73a8bd74 3530 int state, i;
1da177e4
LT		 3531
3532 ASSERT_RTNL();
3533
73a8bd74
DM		 3534 rt6_ifdown(net, dev);
3535 neigh_ifdown(&nd_tbl, dev);
1da177e4
LT		 3536
3537 idev = __in6_dev_get(dev);
63159f29 3538 if (!idev)
1da177e4
LT		 3539 return -ENODEV;
3540
bcdd553f
SH		 3541 /*
3542 * Step 1: remove reference to ipv6 device from parent device.
3543 * Do not dev_put!
1da177e4 3544 */
439e2385 3545 if (how) {
1da177e4 3546 idev->dead = 1;
8814c4b5
YH		 3547
3548 /* protected by rtnl_lock */
a9b3cd7f 3549 RCU_INIT_POINTER(dev->ip6_ptr, NULL);
1da177e4
LT		 3550
3551 /* Step 1.5: remove snmp6 entry */
3552 snmp6_unregister_dev(idev);
3553
3554 }
3555
f1705ec1
DA		 3556 /* aggregate the system setting and interface setting */
3557 _keep_addr = net->ipv6.devconf_all->keep_addr_on_down;
3558 if (!_keep_addr)
3559 _keep_addr = idev->cnf.keep_addr_on_down;
3560
3561 /* combine the user config with event to determine if permanent
3562 * addresses are to be removed from address hash table
3563 */
bc561632 3564 keep_addr = !(how || _keep_addr <= 0 || idev->cnf.disable_ipv6);
f1705ec1 3565
73a8bd74
DM		 3566 /* Step 2: clear hash table */
3567 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3568 struct hlist_head *h = &inet6_addr_lst[i];
73a8bd74
DM		 3569
3570 spin_lock_bh(&addrconf_hash_lock);
67ba4152 3571restart:
b67bfe0d 3572 hlist_for_each_entry_rcu(ifa, h, addr_lst) {
73a8bd74 3573 if (ifa->idev == idev) {
c15b1cca 3574 addrconf_del_dad_work(ifa);
f1705ec1
DA		 3575 /* combined flag + permanent flag decide if
3576 * address is retained on a down event
3577 */
3578 if (!keep_addr ||
70af921d
DA		 3579 !(ifa->flags & IFA_F_PERMANENT) ||
3580 addr_is_local(&ifa->addr)) {
f1705ec1
DA		 3581 hlist_del_init_rcu(&ifa->addr_lst);
3582 goto restart;
3583 }
73a8bd74
DM		 3584 }
3585 }
3586 spin_unlock_bh(&addrconf_hash_lock);
3587 }
3588
1da177e4
LT		 3589 write_lock_bh(&idev->lock);
3590
b7b1bfce
HFS		 3591 addrconf_del_rs_timer(idev);
3592
bcdd553f 3593 /* Step 2: clear flags for stateless addrconf */
439e2385 3594 if (!how)
3c21edbd 3595 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
1da177e4 3596
bcdd553f 3597 /* Step 3: clear tempaddr list */
372e6c8f 3598 while (!list_empty(&idev->tempaddr_list)) {
3599 ifa = list_first_entry(&idev->tempaddr_list,
3600 struct inet6_ifaddr, tmp_list);
3601 list_del(&ifa->tmp_list);
1da177e4
LT		 3602 write_unlock_bh(&idev->lock);
3603 spin_lock_bh(&ifa->lock);
3604
3605 if (ifa->ifpub) {
3606 in6_ifa_put(ifa->ifpub);
3607 ifa->ifpub = NULL;
3608 }
3609 spin_unlock_bh(&ifa->lock);
3610 in6_ifa_put(ifa);
3611 write_lock_bh(&idev->lock);
3612 }
8f37ada5 3613
f1705ec1
DA		 3614 /* re-combine the user config with event to determine if permanent
3615 * addresses are to be removed from the interface list
3616 */
bc561632 3617 keep_addr = (!how && _keep_addr > 0 && !idev->cnf.disable_ipv6);
84e8b803 3618
f1705ec1
DA		 3619 INIT_LIST_HEAD(&del_list);
3620 list_for_each_entry_safe(ifa, tmp, &idev->addr_list, if_list) {
38bd10c4
DA		 3621 struct rt6_info *rt = NULL;
3622
f1705ec1 3623 addrconf_del_dad_work(ifa);
84e8b803 3624
73a8bd74 3625 write_unlock_bh(&idev->lock);
8e8e676d 3626 spin_lock_bh(&ifa->lock);
f1705ec1 3627
70af921d
DA		 3628 if (keep_addr && (ifa->flags & IFA_F_PERMANENT) &&
3629 !addr_is_local(&ifa->addr)) {
f1705ec1
DA		 3630 /* set state to skip the notifier below */
3631 state = INET6_IFADDR_STATE_DEAD;
3632 ifa->state = 0;
3633 if (!(ifa->flags & IFA_F_NODAD))
3634 ifa->flags |= IFA_F_TENTATIVE;
38bd10c4
DA		 3635
3636 rt = ifa->rt;
3637 ifa->rt = NULL;
f1705ec1
DA		 3638 } else {
3639 state = ifa->state;
3640 ifa->state = INET6_IFADDR_STATE_DEAD;
3641
c882219a 3642 list_move(&ifa->if_list, &del_list);
f1705ec1
DA		 3643 }
3644
8e8e676d 3645 spin_unlock_bh(&ifa->lock);
9d82ca98 3646
38bd10c4
DA		 3647 if (rt)
3648 ip6_del_rt(rt);
3649
73a8bd74
DM		 3650 if (state != INET6_IFADDR_STATE_DEAD) {
3651 __ipv6_ifa_notify(RTM_DELADDR, ifa);
f88c91dd 3652 inet6addr_notifier_call_chain(NETDEV_DOWN, ifa);
ea06f717
MM		 3653 } else {
3654 if (idev->cnf.forwarding)
3655 addrconf_leave_anycast(ifa);
3656 addrconf_leave_solict(ifa->idev, &ifa->addr);
27bdb2ab 3657 }
8f37ada5 3658
73a8bd74
DM		 3659 write_lock_bh(&idev->lock);
3660 }
8f37ada5 3661
1da177e4
LT		 3662 write_unlock_bh(&idev->lock);
3663
f1705ec1
DA		 3664 /* now clean up addresses to be removed */
3665 while (!list_empty(&del_list)) {
3666 ifa = list_first_entry(&del_list,
3667 struct inet6_ifaddr, if_list);
3668 list_del(&ifa->if_list);
3669
3670 in6_ifa_put(ifa);
3671 }
3672
381f4dca
SD		 3673 /* Step 5: Discard anycast and multicast list */
3674 if (how) {
3675 ipv6_ac_destroy_dev(idev);
1da177e4 3676 ipv6_mc_destroy_dev(idev);
381f4dca 3677 } else {
1da177e4 3678 ipv6_mc_down(idev);
381f4dca 3679 }
1da177e4 3680
1da177e4 3681 idev->tstamp = jiffies;
1ab1457c 3682
bcdd553f 3683 /* Last: Shot the device (if unregistered) */
439e2385 3684 if (how) {
408c4768 3685 addrconf_sysctl_unregister(idev);
1da177e4
LT		 3686 neigh_parms_release(&nd_tbl, idev->nd_parms);
3687 neigh_ifdown(&nd_tbl, dev);
3688 in6_dev_put(idev);
3689 }
3690 return 0;
3691}
3692
3693static void addrconf_rs_timer(unsigned long data)
3694{
b7b1bfce 3695 struct inet6_dev *idev = (struct inet6_dev *)data;
caf92bc4 3696 struct net_device *dev = idev->dev;
b7b1bfce 3697 struct in6_addr lladdr;
1da177e4 3698
b7b1bfce 3699 write_lock(&idev->lock);
5b2a1953 3700 if (idev->dead || !(idev->if_flags & IF_READY))
1da177e4
LT		 3701 goto out;
3702
9ba2add3 3703 if (!ipv6_accept_ra(idev))
5b2a1953 3704 goto out;
3705
3706 /* Announcement received after solicitation was sent */
3707 if (idev->if_flags & IF_RA_RCVD)
1da177e4 3708 goto out;
1da177e4 3709
bd11f074 3710 if (idev->rs_probes++ < idev->cnf.rtr_solicits || idev->cnf.rtr_solicits < 0) {
caf92bc4
CW		 3711 write_unlock(&idev->lock);
3712 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
3713 ndisc_send_rs(dev, &lladdr,
b7b1bfce
HFS		 3714 &in6addr_linklocal_allrouters);
3715 else
caf92bc4 3716 goto put;
1da177e4 3717
caf92bc4 3718 write_lock(&idev->lock);
bd11f074
MŻ		 3719 idev->rs_interval = rfc3315_s14_backoff_update(
3720 idev->rs_interval, idev->cnf.rtr_solicit_max_interval);
b7b1bfce
HFS		 3721 /* The wait after the last probe can be shorter */
3722 addrconf_mod_rs_timer(idev, (idev->rs_probes ==
3723 idev->cnf.rtr_solicits) ?
3724 idev->cnf.rtr_solicit_delay :
bd11f074 3725 idev->rs_interval);
1da177e4 3726 } else {
1da177e4
LT		 3727 /*
3728 * Note: we do not support deprecated "all on-link"
3729 * assumption any longer.
3730 */
91df42be 3731 pr_debug("%s: no IPv6 routers present\n", idev->dev->name);
1da177e4
LT		 3732 }
3733
3734out:
b7b1bfce 3735 write_unlock(&idev->lock);
caf92bc4 3736put:
b7b1bfce 3737 in6_dev_put(idev);
1da177e4
LT		 3738}
3739
3740/*
3741 * Duplicate Address Detection
3742 */
3c21edbd
YH		 3743static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
3744{
3745 unsigned long rand_num;
3746 struct inet6_dev *idev = ifp->idev;
adc176c5 3747 u64 nonce;
3c21edbd 3748
95c385b4
NH		 3749 if (ifp->flags & IFA_F_OPTIMISTIC)
3750 rand_num = 0;
3751 else
63862b5b 3752 rand_num = prandom_u32() % (idev->cnf.rtr_solicit_delay ? : 1);
95c385b4 3753
adc176c5
EN		 3754 nonce = 0;
3755 if (idev->cnf.enhanced_dad ||
3756 dev_net(idev->dev)->ipv6.devconf_all->enhanced_dad) {
3757 do
3758 get_random_bytes(&nonce, 6);
3759 while (nonce == 0);
3760 }
3761 ifp->dad_nonce = nonce;
b7b1bfce 3762 ifp->dad_probes = idev->cnf.dad_transmits;
c15b1cca 3763 addrconf_mod_dad_work(ifp, rand_num);
3c21edbd
YH		 3764}
3765
c15b1cca 3766static void addrconf_dad_begin(struct inet6_ifaddr *ifp)
1da177e4
LT		 3767{
3768 struct inet6_dev *idev = ifp->idev;
3769 struct net_device *dev = idev->dev;
764d3be6 3770 bool bump_id, notify = false;
1da177e4
LT		 3771
3772 addrconf_join_solict(dev, &ifp->addr);
3773
63862b5b 3774 prandom_seed((__force u32) ifp->addr.s6_addr32[3]);
1da177e4
LT		 3775
3776 read_lock_bh(&idev->lock);
622ccdf1 3777 spin_lock(&ifp->lock);
e9d3e084 3778 if (ifp->state == INET6_IFADDR_STATE_DEAD)
1da177e4 3779 goto out;
1da177e4
LT		 3780
3781 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
1b34be74 3782 idev->cnf.accept_dad < 1 ||
55ebaef1
NT		 3783 !(ifp->flags&IFA_F_TENTATIVE) ||
3784 ifp->flags & IFA_F_NODAD) {
764d3be6 3785 bump_id = ifp->flags & IFA_F_TENTATIVE;
cc411d0b 3786 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
21809faf 3787 spin_unlock(&ifp->lock);
1da177e4
LT		 3788 read_unlock_bh(&idev->lock);
3789
764d3be6 3790 addrconf_dad_completed(ifp, bump_id);
1da177e4
LT		 3791 return;
3792 }
3793
6732bade 3794 if (!(idev->if_flags & IF_READY)) {
21809faf 3795 spin_unlock(&ifp->lock);
6732bade 3796 read_unlock_bh(&idev->lock);
3c21edbd 3797 /*
590a9887 3798 * If the device is not ready:
3c21edbd
YH		 3799 * - keep it tentative if it is a permanent address.
3800 * - otherwise, kill it.
3801 */
3802 in6_ifa_hold(ifp);
cc411d0b 3803 addrconf_dad_stop(ifp, 0);
6732bade 3804 return;
3c21edbd 3805 }
95c385b4
NH		 3806
3807 /*
3808 * Optimistic nodes can start receiving
3809 * Frames right away
3810 */
7fd2561e 3811 if (ifp->flags & IFA_F_OPTIMISTIC) {
95c385b4 3812 ip6_ins_rt(ifp->rt);
7fd2561e
EK		 3813 if (ipv6_use_optimistic_addr(idev)) {
3814 /* Because optimistic nodes can use this address,
3815 * notify listeners. If DAD fails, RTM_DELADDR is sent.
3816 */
16186a82 3817 notify = true;
7fd2561e
EK		 3818 }
3819 }
95c385b4 3820
6732bade 3821 addrconf_dad_kick(ifp);
1da177e4 3822out:
622ccdf1 3823 spin_unlock(&ifp->lock);
1da177e4 3824 read_unlock_bh(&idev->lock);
16186a82 3825 if (notify)
3826 ipv6_ifa_notify(RTM_NEWADDR, ifp);
1da177e4
LT		 3827}
3828
c15b1cca 3829static void addrconf_dad_start(struct inet6_ifaddr *ifp)
1da177e4 3830{
c15b1cca
HFS		 3831 bool begin_dad = false;
3832
8e8e676d 3833 spin_lock_bh(&ifp->lock);
c15b1cca
HFS		 3834 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
3835 ifp->state = INET6_IFADDR_STATE_PREDAD;
3836 begin_dad = true;
3837 }
8e8e676d 3838 spin_unlock_bh(&ifp->lock);
c15b1cca
HFS		 3839
3840 if (begin_dad)
3841 addrconf_mod_dad_work(ifp, 0);
3842}
3843
3844static void addrconf_dad_work(struct work_struct *w)
3845{
3846 struct inet6_ifaddr *ifp = container_of(to_delayed_work(w),
3847 struct inet6_ifaddr,
3848 dad_work);
1da177e4 3849 struct inet6_dev *idev = ifp->idev;
764d3be6 3850 bool bump_id, disable_ipv6 = false;
1da177e4
LT		 3851 struct in6_addr mcaddr;
3852
c15b1cca
HFS		 3853 enum {
3854 DAD_PROCESS,
3855 DAD_BEGIN,
3856 DAD_ABORT,
3857 } action = DAD_PROCESS;
3858
3859 rtnl_lock();
3860
8e8e676d 3861 spin_lock_bh(&ifp->lock);
c15b1cca
HFS		 3862 if (ifp->state == INET6_IFADDR_STATE_PREDAD) {
3863 action = DAD_BEGIN;
3864 ifp->state = INET6_IFADDR_STATE_DAD;
3865 } else if (ifp->state == INET6_IFADDR_STATE_ERRDAD) {
3866 action = DAD_ABORT;
3867 ifp->state = INET6_IFADDR_STATE_POSTDAD;
85b51b12
MM		 3868
3869 if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6 &&
3870 !(ifp->flags & IFA_F_STABLE_PRIVACY)) {
3871 struct in6_addr addr;
3872
3873 addr.s6_addr32[0] = htonl(0xfe800000);
3874 addr.s6_addr32[1] = 0;
3875
3876 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
3877 ipv6_addr_equal(&ifp->addr, &addr)) {
3878 /* DAD failed for link-local based on MAC */
3879 idev->cnf.disable_ipv6 = 1;
3880
3881 pr_info("%s: IPv6 being disabled!\n",
3882 ifp->idev->dev->name);
3883 disable_ipv6 = true;
3884 }
3885 }
c15b1cca 3886 }
8e8e676d 3887 spin_unlock_bh(&ifp->lock);
c15b1cca
HFS		 3888
3889 if (action == DAD_BEGIN) {
3890 addrconf_dad_begin(ifp);
3891 goto out;
3892 } else if (action == DAD_ABORT) {
751eb6b6 3893 in6_ifa_hold(ifp);
c15b1cca 3894 addrconf_dad_stop(ifp, 1);
85b51b12
MM		 3895 if (disable_ipv6)
3896 addrconf_ifdown(idev->dev, 0);
c15b1cca
HFS		 3897 goto out;
3898 }
3899
b7b1bfce 3900 if (!ifp->dad_probes && addrconf_dad_end(ifp))
f2344a13
HX		 3901 goto out;
3902
c15b1cca 3903 write_lock_bh(&idev->lock);
122e4519 3904 if (idev->dead || !(idev->if_flags & IF_READY)) {
c15b1cca 3905 write_unlock_bh(&idev->lock);
1da177e4
LT		 3906 goto out;
3907 }
21809faf 3908
3909 spin_lock(&ifp->lock);
622ccdf1
HX		 3910 if (ifp->state == INET6_IFADDR_STATE_DEAD) {
3911 spin_unlock(&ifp->lock);
c15b1cca 3912 write_unlock_bh(&idev->lock);
622ccdf1
HX		 3913 goto out;
3914 }
3915
b7b1bfce 3916 if (ifp->dad_probes == 0) {
1da177e4
LT		 3917 /*
3918 * DAD was successful
3919 */
3920
764d3be6 3921 bump_id = ifp->flags & IFA_F_TENTATIVE;
cc411d0b 3922 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
21809faf 3923 spin_unlock(&ifp->lock);
c15b1cca 3924 write_unlock_bh(&idev->lock);
1da177e4 3925
764d3be6 3926 addrconf_dad_completed(ifp, bump_id);
1da177e4
LT		 3927
3928 goto out;
3929 }
3930
b7b1bfce 3931 ifp->dad_probes--;
c15b1cca
HFS		 3932 addrconf_mod_dad_work(ifp,
3933 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME));
21809faf 3934 spin_unlock(&ifp->lock);
c15b1cca 3935 write_unlock_bh(&idev->lock);
1da177e4
LT		 3936
3937 /* send a neighbour solicitation for our addr */
1da177e4 3938 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
adc176c5
EN		 3939 ndisc_send_ns(ifp->idev->dev, &ifp->addr, &mcaddr, &in6addr_any,
3940 ifp->dad_nonce);
1da177e4
LT		 3941out:
3942 in6_ifa_put(ifp);
c15b1cca 3943 rtnl_unlock();
1da177e4
LT		 3944}
3945
11ffff75
HFS		 3946/* ifp->idev must be at least read locked */
3947static bool ipv6_lonely_lladdr(struct inet6_ifaddr *ifp)
3948{
3949 struct inet6_ifaddr *ifpiter;
3950 struct inet6_dev *idev = ifp->idev;
3951
602582ca
HFS		 3952 list_for_each_entry_reverse(ifpiter, &idev->addr_list, if_list) {
3953 if (ifpiter->scope > IFA_LINK)
3954 break;
11ffff75
HFS		 3955 if (ifp != ifpiter && ifpiter->scope == IFA_LINK &&
3956 (ifpiter->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE|
3957 IFA_F_OPTIMISTIC|IFA_F_DADFAILED)) ==
3958 IFA_F_PERMANENT)
3959 return false;
3960 }
3961 return true;
3962}
3963
764d3be6 3964static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id)
1da177e4 3965{
e21e8467 3966 struct net_device *dev = ifp->idev->dev;
b7b1bfce 3967 struct in6_addr lladdr;
b173ee48 3968 bool send_rs, send_mld;
b7b1bfce 3969
c15b1cca 3970 addrconf_del_dad_work(ifp);
1da177e4
LT		 3971
3972 /*
3973 * Configure the address for reception. Now it is valid.
3974 */
3975
3976 ipv6_ifa_notify(RTM_NEWADDR, ifp);
3977
026359bc
TA		 3978 /* If added prefix is link local and we are prepared to process
3979 router advertisements, start sending router solicitations.
1da177e4
LT		 3980 */
3981
1ec047eb 3982 read_lock_bh(&ifp->idev->lock);
11ffff75 3983 send_mld = ifp->scope == IFA_LINK && ipv6_lonely_lladdr(ifp);
b173ee48
HFS		 3984 send_rs = send_mld &&
3985 ipv6_accept_ra(ifp->idev) &&
bd11f074 3986 ifp->idev->cnf.rtr_solicits != 0 &&
b173ee48 3987 (dev->flags&IFF_LOOPBACK) == 0;
1ec047eb
HFS		 3988 read_unlock_bh(&ifp->idev->lock);
3989
b173ee48
HFS		 3990 /* While dad is in progress mld report's source address is in6_addrany.
3991 * Resend with proper ll now.
3992 */
3993 if (send_mld)
3994 ipv6_mc_dad_complete(ifp->idev);
3995
1ec047eb 3996 if (send_rs) {
1da177e4
LT		 3997 /*
3998 * If a host as already performed a random delay
3999 * [...] as part of DAD [...] there is no need
4000 * to delay again before sending the first RS
4001 */
1ec047eb 4002 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
b7b1bfce 4003 return;
1ec047eb 4004 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters);
1da177e4 4005
b7b1bfce
HFS		 4006 write_lock_bh(&ifp->idev->lock);
4007 spin_lock(&ifp->lock);
bd11f074
MŻ		 4008 ifp->idev->rs_interval = rfc3315_s14_backoff_init(
4009 ifp->idev->cnf.rtr_solicit_interval);
b7b1bfce 4010 ifp->idev->rs_probes = 1;
1da177e4 4011 ifp->idev->if_flags |= IF_RS_SENT;
bd11f074 4012 addrconf_mod_rs_timer(ifp->idev, ifp->idev->rs_interval);
b7b1bfce
HFS		 4013 spin_unlock(&ifp->lock);
4014 write_unlock_bh(&ifp->idev->lock);
1da177e4 4015 }
764d3be6
PA		 4016
4017 if (bump_id)
4018 rt_genid_bump_ipv6(dev_net(dev));
1da177e4
LT		 4019}
4020
e21e8467
SH		 4021static void addrconf_dad_run(struct inet6_dev *idev)
4022{
c5e33bdd
YH		 4023 struct inet6_ifaddr *ifp;
4024
4025 read_lock_bh(&idev->lock);
502a2ffd 4026 list_for_each_entry(ifp, &idev->addr_list, if_list) {
21809faf 4027 spin_lock(&ifp->lock);
f2344a13
HX		 4028 if (ifp->flags & IFA_F_TENTATIVE &&
4029 ifp->state == INET6_IFADDR_STATE_DAD)
4030 addrconf_dad_kick(ifp);
21809faf 4031 spin_unlock(&ifp->lock);
c5e33bdd
YH		 4032 }
4033 read_unlock_bh(&idev->lock);
4034}
4035
1da177e4
LT		 4036#ifdef CONFIG_PROC_FS
4037struct if6_iter_state {
3c40090a 4038 struct seq_net_private p;
1da177e4 4039 int bucket;
1d578303 4040 int offset;
1da177e4
LT		 4041};
4042
1d578303 4043static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos)
1da177e4
LT		 4044{
4045 struct inet6_ifaddr *ifa = NULL;
4046 struct if6_iter_state *state = seq->private;
1218854a 4047 struct net *net = seq_file_net(seq);
1d578303 4048 int p = 0;
1da177e4 4049
1d578303
MM		 4050 /* initial bucket if pos is 0 */
4051 if (pos == 0) {
4052 state->bucket = 0;
4053 state->offset = 0;
4054 }
4055
4056 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
b67bfe0d 4057 hlist_for_each_entry_rcu_bh(ifa, &inet6_addr_lst[state->bucket],
1d578303 4058 addr_lst) {
9f0d3c27
ED		 4059 if (!net_eq(dev_net(ifa->idev->dev), net))
4060 continue;
1d578303
MM		 4061 /* sync with offset */
4062 if (p < state->offset) {
4063 p++;
4064 continue;
4065 }
4066 state->offset++;
9f0d3c27 4067 return ifa;
1d578303
MM		 4068 }
4069
4070 /* prepare for next bucket */
4071 state->offset = 0;
4072 p = 0;
1da177e4 4073 }
c2e21293 4074 return NULL;
1da177e4
LT		 4075}
4076
c2e21293 4077static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
4078 struct inet6_ifaddr *ifa)
1da177e4
LT		 4079{
4080 struct if6_iter_state *state = seq->private;
1218854a 4081 struct net *net = seq_file_net(seq);
1da177e4 4082
b67bfe0d 4083 hlist_for_each_entry_continue_rcu_bh(ifa, addr_lst) {
9f0d3c27
ED		 4084 if (!net_eq(dev_net(ifa->idev->dev), net))
4085 continue;
1d578303 4086 state->offset++;
9f0d3c27 4087 return ifa;
1d578303 4088 }
3c40090a 4089
c2e21293 4090 while (++state->bucket < IN6_ADDR_HSIZE) {
1d578303 4091 state->offset = 0;
b67bfe0d 4092 hlist_for_each_entry_rcu_bh(ifa,
c2e21293 4093 &inet6_addr_lst[state->bucket], addr_lst) {
9f0d3c27
ED		 4094 if (!net_eq(dev_net(ifa->idev->dev), net))
4095 continue;
1d578303 4096 state->offset++;
9f0d3c27 4097 return ifa;
c2e21293 4098 }
1da177e4 4099 }
3c40090a 4100
c2e21293 4101 return NULL;
1da177e4
LT		 4102}
4103
1da177e4 4104static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
4f70ecca 4105 __acquires(rcu_bh)
1da177e4 4106{
5c578aed 4107 rcu_read_lock_bh();
1d578303 4108 return if6_get_first(seq, *pos);
1da177e4
LT		 4109}
4110
4111static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
4112{
4113 struct inet6_ifaddr *ifa;
4114
4115 ifa = if6_get_next(seq, v);
4116 ++*pos;
4117 return ifa;
4118}
4119
4120static void if6_seq_stop(struct seq_file *seq, void *v)
4f70ecca 4121 __releases(rcu_bh)
1da177e4 4122{
5c578aed 4123 rcu_read_unlock_bh();
1da177e4
LT		 4124}
4125
4126static int if6_seq_show(struct seq_file *seq, void *v)
4127{
4128 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
971a351c 4129 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
b071195d 4130 &ifp->addr,
1da177e4
LT		 4131 ifp->idev->dev->ifindex,
4132 ifp->prefix_len,
4133 ifp->scope,
971a351c 4134 (u8) ifp->flags,
1da177e4
LT		 4135 ifp->idev->dev->name);
4136 return 0;
4137}
4138
56b3d975 4139static const struct seq_operations if6_seq_ops = {
1da177e4
LT		 4140 .start = if6_seq_start,
4141 .next = if6_seq_next,
4142 .show = if6_seq_show,
4143 .stop = if6_seq_stop,
4144};
4145
4146static int if6_seq_open(struct inode *inode, struct file *file)
4147{
3c40090a
DL		 4148 return seq_open_net(inode, file, &if6_seq_ops,
4149 sizeof(struct if6_iter_state));
1da177e4
LT		 4150}
4151
9a32144e 4152static const struct file_operations if6_fops = {
1da177e4
LT		 4153 .owner = THIS_MODULE,
4154 .open = if6_seq_open,
4155 .read = seq_read,
4156 .llseek = seq_lseek,
3c40090a 4157 .release = seq_release_net,
1da177e4
LT		 4158};
4159
2c8c1e72 4160static int __net_init if6_proc_net_init(struct net *net)
1da177e4 4161{
d4beaa66 4162 if (!proc_create("if_inet6", S_IRUGO, net->proc_net, &if6_fops))
1da177e4
LT		 4163 return -ENOMEM;
4164 return 0;
4165}
4166
2c8c1e72 4167static void __net_exit if6_proc_net_exit(struct net *net)
3c40090a 4168{
ece31ffd 4169 remove_proc_entry("if_inet6", net->proc_net);
3c40090a
DL		 4170}
4171
4172static struct pernet_operations if6_proc_net_ops = {
67ba4152
IM		 4173 .init = if6_proc_net_init,
4174 .exit = if6_proc_net_exit,
3c40090a
DL		 4175};
4176
4177int __init if6_proc_init(void)
4178{
4179 return register_pernet_subsys(&if6_proc_net_ops);
4180}
4181
1da177e4
LT		 4182void if6_proc_exit(void)
4183{
3c40090a 4184 unregister_pernet_subsys(&if6_proc_net_ops);
1da177e4
LT		 4185}
4186#endif /* CONFIG_PROC_FS */
4187
07a93626 4188#if IS_ENABLED(CONFIG_IPV6_MIP6)
3b9f9a1c 4189/* Check if address is a home address configured on any interface. */
b71d1d42 4190int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr)
3b9f9a1c
NT		 4191{
4192 int ret = 0;
c2e21293 4193 struct inet6_ifaddr *ifp = NULL;
ddbe5032 4194 unsigned int hash = inet6_addr_hash(addr);
c2e21293 4195
5c578aed 4196 rcu_read_lock_bh();
b67bfe0d 4197 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
878628fb 4198 if (!net_eq(dev_net(ifp->idev->dev), net))
389f6612 4199 continue;
caad295f 4200 if (ipv6_addr_equal(&ifp->addr, addr) &&
3b9f9a1c
NT		 4201 (ifp->flags & IFA_F_HOMEADDRESS)) {
4202 ret = 1;
4203 break;
4204 }
4205 }
5c578aed 4206 rcu_read_unlock_bh();
3b9f9a1c
NT		 4207 return ret;
4208}
4209#endif
4210
1da177e4
LT		 4211/*
4212 * Periodic address status verification
4213 */
4214
c15b1cca 4215static void addrconf_verify_rtnl(void)
1da177e4 4216{
b2db7564 4217 unsigned long now, next, next_sec, next_sched;
1da177e4 4218 struct inet6_ifaddr *ifp;
1da177e4
LT		 4219 int i;
4220
c15b1cca
HFS		 4221 ASSERT_RTNL();
4222
5c578aed 4223 rcu_read_lock_bh();
1da177e4 4224 now = jiffies;
b2db7564 4225 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
1da177e4 4226
c15b1cca 4227 cancel_delayed_work(&addr_chk_work);
1da177e4 4228
bcdd553f 4229 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
1da177e4 4230restart:
c15b1cca 4231 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[i], addr_lst) {
1da177e4 4232 unsigned long age;
1da177e4 4233
fad8da3e
YA		 4234 /* When setting preferred_lft to a value not zero or
4235 * infinity, while valid_lft is infinity
4236 * IFA_F_PERMANENT has a non-infinity life time.
4237 */
4238 if ((ifp->flags & IFA_F_PERMANENT) &&
4239 (ifp->prefered_lft == INFINITY_LIFE_TIME))
1da177e4
LT		 4240 continue;
4241
4242 spin_lock(&ifp->lock);
b2db7564
YH		 4243 /* We try to batch several events at once. */
4244 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
1da177e4 4245
8f27ebb9
YH		 4246 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
4247 age >= ifp->valid_lft) {
1da177e4
LT		 4248 spin_unlock(&ifp->lock);
4249 in6_ifa_hold(ifp);
1da177e4
LT		 4250 ipv6_del_addr(ifp);
4251 goto restart;
8f27ebb9
YH		 4252 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
4253 spin_unlock(&ifp->lock);
4254 continue;
1da177e4 4255 } else if (age >= ifp->prefered_lft) {
a1ed0526 4256 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
1da177e4
LT		 4257 int deprecate = 0;
4258
4259 if (!(ifp->flags&IFA_F_DEPRECATED)) {
4260 deprecate = 1;
4261 ifp->flags |= IFA_F_DEPRECATED;
4262 }
4263
fad8da3e
YA		 4264 if ((ifp->valid_lft != INFINITY_LIFE_TIME) &&
4265 (time_before(ifp->tstamp + ifp->valid_lft * HZ, next)))
1da177e4
LT		 4266 next = ifp->tstamp + ifp->valid_lft * HZ;
4267
4268 spin_unlock(&ifp->lock);
4269
4270 if (deprecate) {
4271 in6_ifa_hold(ifp);
1da177e4
LT		 4272
4273 ipv6_ifa_notify(0, ifp);
4274 in6_ifa_put(ifp);
4275 goto restart;
4276 }
1da177e4
LT		 4277 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
4278 !(ifp->flags&IFA_F_TENTATIVE)) {
88949cf4 4279 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
4280 ifp->idev->cnf.dad_transmits *
1f9248e5 4281 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME) / HZ;
88949cf4 4282
1da177e4
LT		 4283 if (age >= ifp->prefered_lft - regen_advance) {
4284 struct inet6_ifaddr *ifpub = ifp->ifpub;
4285 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
4286 next = ifp->tstamp + ifp->prefered_lft * HZ;
4287 if (!ifp->regen_count && ifpub) {
4288 ifp->regen_count++;
4289 in6_ifa_hold(ifp);
4290 in6_ifa_hold(ifpub);
4291 spin_unlock(&ifp->lock);
5c578aed 4292
291d809b
HY		 4293 spin_lock(&ifpub->lock);
4294 ifpub->regen_count = 0;
4295 spin_unlock(&ifpub->lock);
1da177e4
LT		 4296 ipv6_create_tempaddr(ifpub, ifp);
4297 in6_ifa_put(ifpub);
4298 in6_ifa_put(ifp);
4299 goto restart;
4300 }
4301 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
4302 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
4303 spin_unlock(&ifp->lock);
1da177e4
LT		 4304 } else {
4305 /* ifp->prefered_lft <= ifp->valid_lft */
4306 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
4307 next = ifp->tstamp + ifp->prefered_lft * HZ;
4308 spin_unlock(&ifp->lock);
4309 }
4310 }
1da177e4
LT		 4311 }
4312
b2db7564
YH		 4313 next_sec = round_jiffies_up(next);
4314 next_sched = next;
4315
4316 /* If rounded timeout is accurate enough, accept it. */
4317 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
4318 next_sched = next_sec;
4319
4320 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
4321 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
4322 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
4323
ba3542e1 4324 ADBG(KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
4325 now, next, next_sec, next_sched);
c15b1cca 4326 mod_delayed_work(addrconf_wq, &addr_chk_work, next_sched - now);
5c578aed 4327 rcu_read_unlock_bh();
1da177e4
LT		 4328}
4329
c15b1cca
HFS		 4330static void addrconf_verify_work(struct work_struct *w)
4331{
4332 rtnl_lock();
4333 addrconf_verify_rtnl();
4334 rtnl_unlock();
4335}
4336
4337static void addrconf_verify(void)
4338{
4339 mod_delayed_work(addrconf_wq, &addr_chk_work, 0);
4340}
4341
caeaba79
ND		 4342static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local,
4343 struct in6_addr **peer_pfx)
461d8837
TG		 4344{
4345 struct in6_addr *pfx = NULL;
4346
caeaba79
ND		 4347 *peer_pfx = NULL;
4348
461d8837
TG		 4349 if (addr)
4350 pfx = nla_data(addr);
4351
4352 if (local) {
4353 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
caeaba79
ND		 4354 *peer_pfx = pfx;
4355 pfx = nla_data(local);
461d8837
TG		 4356 }
4357
4358 return pfx;
4359}
4360
ef7c79ed 4361static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
461d8837
TG		 4362 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
4363 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
4364 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
479840ff 4365 [IFA_FLAGS] = { .len = sizeof(u32) },
461d8837
TG		 4366};
4367
1da177e4 4368static int
661d2967 4369inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh)
1da177e4 4370{
3b1e0a65 4371 struct net *net = sock_net(skb->sk);
b933f716
TG		 4372 struct ifaddrmsg *ifm;
4373 struct nlattr *tb[IFA_MAX+1];
caeaba79 4374 struct in6_addr *pfx, *peer_pfx;
6046d5b4 4375 u32 ifa_flags;
b933f716 4376 int err;
1da177e4 4377
b933f716
TG		 4378 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
4379 if (err < 0)
4380 return err;
4381
4382 ifm = nlmsg_data(nlh);
caeaba79 4383 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
63159f29 4384 if (!pfx)
1da177e4
LT		 4385 return -EINVAL;
4386
6046d5b4
HK		 4387 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
4388
4389 /* We ignore other flags so far. */
4390 ifa_flags &= IFA_F_MANAGETEMPADDR;
4391
4392 return inet6_addr_del(net, ifm->ifa_index, ifa_flags, pfx,
4393 ifm->ifa_prefixlen);
1da177e4
LT		 4394}
4395
479840ff 4396static int inet6_addr_modify(struct inet6_ifaddr *ifp, u32 ifa_flags,
55ebaef1 4397 u32 prefered_lft, u32 valid_lft)
081bba5b 4398{
6f704992
YH		 4399 u32 flags;
4400 clock_t expires;
4bed72e4 4401 unsigned long timeout;
53bd6749 4402 bool was_managetempaddr;
5b84efec 4403 bool had_prefixroute;
46d48046 4404
c15b1cca
HFS		 4405 ASSERT_RTNL();
4406
081bba5b
NT		 4407 if (!valid_lft || (prefered_lft > valid_lft))
4408 return -EINVAL;
4409
53bd6749
JP		 4410 if (ifa_flags & IFA_F_MANAGETEMPADDR &&
4411 (ifp->flags & IFA_F_TEMPORARY || ifp->prefix_len != 64))
4412 return -EINVAL;
4413
4bed72e4
YH		 4414 timeout = addrconf_timeout_fixup(valid_lft, HZ);
4415 if (addrconf_finite_timeout(timeout)) {
4416 expires = jiffies_to_clock_t(timeout * HZ);
4417 valid_lft = timeout;
6f704992 4418 flags = RTF_EXPIRES;
4bed72e4
YH		 4419 } else {
4420 expires = 0;
4421 flags = 0;
4422 ifa_flags |= IFA_F_PERMANENT;
6f704992 4423 }
081bba5b 4424
4bed72e4
YH		 4425 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
4426 if (addrconf_finite_timeout(timeout)) {
4427 if (timeout == 0)
4428 ifa_flags |= IFA_F_DEPRECATED;
4429 prefered_lft = timeout;
4430 }
081bba5b
NT		 4431
4432 spin_lock_bh(&ifp->lock);
53bd6749 4433 was_managetempaddr = ifp->flags & IFA_F_MANAGETEMPADDR;
5b84efec
TH		 4434 had_prefixroute = ifp->flags & IFA_F_PERMANENT &&
4435 !(ifp->flags & IFA_F_NOPREFIXROUTE);
53bd6749 4436 ifp->flags &= ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD |
761aac73
TH		 4437 IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
4438 IFA_F_NOPREFIXROUTE);
53bd6749 4439 ifp->flags |= ifa_flags;
081bba5b
NT		 4440 ifp->tstamp = jiffies;
4441 ifp->valid_lft = valid_lft;
4442 ifp->prefered_lft = prefered_lft;
4443
4444 spin_unlock_bh(&ifp->lock);
4445 if (!(ifp->flags&IFA_F_TENTATIVE))
4446 ipv6_ifa_notify(0, ifp);
081bba5b 4447
761aac73
TH		 4448 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) {
4449 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
4450 expires, flags);
5b84efec
TH		 4451 } else if (had_prefixroute) {
4452 enum cleanup_prefix_rt_t action;
4453 unsigned long rt_expires;
4454
4455 write_lock_bh(&ifp->idev->lock);
4456 action = check_cleanup_prefix_route(ifp, &rt_expires);
4457 write_unlock_bh(&ifp->idev->lock);
4458
4459 if (action != CLEANUP_PREFIX_RT_NOP) {
4460 cleanup_prefix_route(ifp, rt_expires,
4461 action == CLEANUP_PREFIX_RT_DEL);
4462 }
761aac73 4463 }
53bd6749
JP		 4464
4465 if (was_managetempaddr || ifp->flags & IFA_F_MANAGETEMPADDR) {
4466 if (was_managetempaddr && !(ifp->flags & IFA_F_MANAGETEMPADDR))
4467 valid_lft = prefered_lft = 0;
4468 manage_tempaddrs(ifp->idev, ifp, valid_lft, prefered_lft,
4469 !was_managetempaddr, jiffies);
4470 }
4471
c15b1cca 4472 addrconf_verify_rtnl();
081bba5b
NT		 4473
4474 return 0;
4475}
4476
1da177e4 4477static int
661d2967 4478inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh)
1da177e4 4479{
3b1e0a65 4480 struct net *net = sock_net(skb->sk);
461d8837
TG		 4481 struct ifaddrmsg *ifm;
4482 struct nlattr *tb[IFA_MAX+1];
caeaba79 4483 struct in6_addr *pfx, *peer_pfx;
7198f8ce
TG		 4484 struct inet6_ifaddr *ifa;
4485 struct net_device *dev;
55ebaef1 4486 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
479840ff 4487 u32 ifa_flags;
461d8837 4488 int err;
1da177e4 4489
461d8837
TG		 4490 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
4491 if (err < 0)
4492 return err;
4493
4494 ifm = nlmsg_data(nlh);
caeaba79 4495 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
63159f29 4496 if (!pfx)
1da177e4
LT		 4497 return -EINVAL;
4498
461d8837 4499 if (tb[IFA_CACHEINFO]) {
0778769d 4500 struct ifa_cacheinfo *ci;
461d8837
TG		 4501
4502 ci = nla_data(tb[IFA_CACHEINFO]);
0778769d 4503 valid_lft = ci->ifa_valid;
461d8837
TG		 4504 preferred_lft = ci->ifa_prefered;
4505 } else {
4506 preferred_lft = INFINITY_LIFE_TIME;
4507 valid_lft = INFINITY_LIFE_TIME;
0778769d
NT		 4508 }
4509
af284937 4510 dev = __dev_get_by_index(net, ifm->ifa_index);
63159f29 4511 if (!dev)
7198f8ce
TG		 4512 return -ENODEV;
4513
479840ff
JP		 4514 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
4515
55ebaef1 4516 /* We ignore other flags so far. */
761aac73 4517 ifa_flags &= IFA_F_NODAD | IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
93a714d6 4518 IFA_F_NOPREFIXROUTE | IFA_F_MCAUTOJOIN;
55ebaef1 4519
1cab3da6 4520 ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
63159f29 4521 if (!ifa) {
7198f8ce
TG		 4522 /*
4523 * It would be best to check for !NLM_F_CREATE here but
db9c7c39 4524 * userspace already relies on not having to provide this.
7198f8ce 4525 */
caeaba79 4526 return inet6_addr_add(net, ifm->ifa_index, pfx, peer_pfx,
af284937
DL		 4527 ifm->ifa_prefixlen, ifa_flags,
4528 preferred_lft, valid_lft);
081bba5b
NT		 4529 }
4530
7198f8ce
TG		 4531 if (nlh->nlmsg_flags & NLM_F_EXCL ||
4532 !(nlh->nlmsg_flags & NLM_F_REPLACE))
4533 err = -EEXIST;
4534 else
55ebaef1 4535 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
7198f8ce
TG		 4536
4537 in6_ifa_put(ifa);
4538
4539 return err;
1da177e4
LT		 4540}
4541
479840ff 4542static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u32 flags,
101bb229
TG		 4543 u8 scope, int ifindex)
4544{
4545 struct ifaddrmsg *ifm;
4546
4547 ifm = nlmsg_data(nlh);
4548 ifm->ifa_family = AF_INET6;
4549 ifm->ifa_prefixlen = prefixlen;
4550 ifm->ifa_flags = flags;
4551 ifm->ifa_scope = scope;
4552 ifm->ifa_index = ifindex;
4553}
4554
85486af0
TG		 4555static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
4556 unsigned long tstamp, u32 preferred, u32 valid)
4557{
4558 struct ifa_cacheinfo ci;
4559
18a31e1e
TG		 4560 ci.cstamp = cstamp_delta(cstamp);
4561 ci.tstamp = cstamp_delta(tstamp);
85486af0
TG		 4562 ci.ifa_prefered = preferred;
4563 ci.ifa_valid = valid;
4564
4565 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
4566}
4567
101bb229
TG		 4568static inline int rt_scope(int ifa_scope)
4569{
4570 if (ifa_scope & IFA_HOST)
4571 return RT_SCOPE_HOST;
4572 else if (ifa_scope & IFA_LINK)
4573 return RT_SCOPE_LINK;
4574 else if (ifa_scope & IFA_SITE)
4575 return RT_SCOPE_SITE;
4576 else
4577 return RT_SCOPE_UNIVERSE;
4578}
4579
0ab6803b
TG		 4580static inline int inet6_ifaddr_msgsize(void)
4581{
339bf98f 4582 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
caeaba79 4583 + nla_total_size(16) /* IFA_LOCAL */
339bf98f 4584 + nla_total_size(16) /* IFA_ADDRESS */
479840ff
JP		 4585 + nla_total_size(sizeof(struct ifa_cacheinfo))
4586 + nla_total_size(4) /* IFA_FLAGS */;
0ab6803b 4587}
c5396a31 4588
1da177e4 4589static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
15e47304 4590 u32 portid, u32 seq, int event, unsigned int flags)
1da177e4 4591{
1da177e4 4592 struct nlmsghdr *nlh;
85486af0 4593 u32 preferred, valid;
1da177e4 4594
15e47304 4595 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
63159f29 4596 if (!nlh)
26932566 4597 return -EMSGSIZE;
0ab6803b 4598
101bb229
TG		 4599 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
4600 ifa->idev->dev->ifindex);
4601
fad8da3e
YA		 4602 if (!((ifa->flags&IFA_F_PERMANENT) &&
4603 (ifa->prefered_lft == INFINITY_LIFE_TIME))) {
85486af0
TG		 4604 preferred = ifa->prefered_lft;
4605 valid = ifa->valid_lft;
4606 if (preferred != INFINITY_LIFE_TIME) {
1da177e4 4607 long tval = (jiffies - ifa->tstamp)/HZ;
a1faa698
JR		 4608 if (preferred > tval)
4609 preferred -= tval;
4610 else
4611 preferred = 0;
f56619fc
BH		 4612 if (valid != INFINITY_LIFE_TIME) {
4613 if (valid > tval)
4614 valid -= tval;
4615 else
4616 valid = 0;
4617 }
1da177e4
LT		 4618 }
4619 } else {
85486af0
TG		 4620 preferred = INFINITY_LIFE_TIME;
4621 valid = INFINITY_LIFE_TIME;
4622 }
4623
7996c799 4624 if (!ipv6_addr_any(&ifa->peer_addr)) {
930345ea
JB		 4625 if (nla_put_in6_addr(skb, IFA_LOCAL, &ifa->addr) < 0 ||
4626 nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->peer_addr) < 0)
caeaba79
ND		 4627 goto error;
4628 } else
930345ea 4629 if (nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->addr) < 0)
caeaba79
ND		 4630 goto error;
4631
4632 if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0)
4633 goto error;
1da177e4 4634
479840ff
JP		 4635 if (nla_put_u32(skb, IFA_FLAGS, ifa->flags) < 0)
4636 goto error;
4637
053c095a
JB		 4638 nlmsg_end(skb, nlh);
4639 return 0;
caeaba79
ND		 4640
4641error:
4642 nlmsg_cancel(skb, nlh);
4643 return -EMSGSIZE;
1da177e4
LT		 4644}
4645
4646static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
15e47304 4647 u32 portid, u32 seq, int event, u16 flags)
1da177e4 4648{
1da177e4 4649 struct nlmsghdr *nlh;
101bb229
TG		 4650 u8 scope = RT_SCOPE_UNIVERSE;
4651 int ifindex = ifmca->idev->dev->ifindex;
4652
4653 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
4654 scope = RT_SCOPE_SITE;
1da177e4 4655
15e47304 4656 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
63159f29 4657 if (!nlh)
26932566 4658 return -EMSGSIZE;
85486af0 4659
0ab6803b 4660 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
930345ea 4661 if (nla_put_in6_addr(skb, IFA_MULTICAST, &ifmca->mca_addr) < 0 ||
0ab6803b 4662 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
26932566
PM		 4663 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
4664 nlmsg_cancel(skb, nlh);
4665 return -EMSGSIZE;
4666 }
85486af0 4667
053c095a
JB		 4668 nlmsg_end(skb, nlh);
4669 return 0;
1da177e4
LT		 4670}
4671
4672static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
15e47304 4673 u32 portid, u32 seq, int event, unsigned int flags)
1da177e4 4674{
1da177e4 4675 struct nlmsghdr *nlh;
101bb229
TG		 4676 u8 scope = RT_SCOPE_UNIVERSE;
4677 int ifindex = ifaca->aca_idev->dev->ifindex;
4678
4679 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
4680 scope = RT_SCOPE_SITE;
1da177e4 4681
15e47304 4682 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
63159f29 4683 if (!nlh)
26932566 4684 return -EMSGSIZE;
85486af0 4685
0ab6803b 4686 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
930345ea 4687 if (nla_put_in6_addr(skb, IFA_ANYCAST, &ifaca->aca_addr) < 0 ||
0ab6803b 4688 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
26932566
PM		 4689 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
4690 nlmsg_cancel(skb, nlh);
4691 return -EMSGSIZE;
4692 }
1da177e4 4693
053c095a
JB		 4694 nlmsg_end(skb, nlh);
4695 return 0;
1da177e4
LT		 4696}
4697
e21e8467 4698enum addr_type_t {
1da177e4
LT		 4699 UNICAST_ADDR,
4700 MULTICAST_ADDR,
4701 ANYCAST_ADDR,
4702};
4703
234b27c3
ED		 4704/* called with rcu_read_lock() */
4705static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
4706 struct netlink_callback *cb, enum addr_type_t type,
4707 int s_ip_idx, int *p_ip_idx)
4708{
234b27c3
ED		 4709 struct ifmcaddr6 *ifmca;
4710 struct ifacaddr6 *ifaca;
4711 int err = 1;
4712 int ip_idx = *p_ip_idx;
4713
4714 read_lock_bh(&idev->lock);
4715 switch (type) {
502a2ffd 4716 case UNICAST_ADDR: {
4717 struct inet6_ifaddr *ifa;
4718
234b27c3 4719 /* unicast address incl. temp addr */
502a2ffd 4720 list_for_each_entry(ifa, &idev->addr_list, if_list) {
4721 if (++ip_idx < s_ip_idx)
234b27c3
ED		 4722 continue;
4723 err = inet6_fill_ifaddr(skb, ifa,
15e47304 4724 NETLINK_CB(cb->skb).portid,
234b27c3
ED		 4725 cb->nlh->nlmsg_seq,
4726 RTM_NEWADDR,
4727 NLM_F_MULTI);
053c095a 4728 if (err < 0)
234b27c3 4729 break;
63998ac2 4730 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
234b27c3
ED		 4731 }
4732 break;
502a2ffd 4733 }
234b27c3
ED		 4734 case MULTICAST_ADDR:
4735 /* multicast address */
4736 for (ifmca = idev->mc_list; ifmca;
4737 ifmca = ifmca->next, ip_idx++) {
4738 if (ip_idx < s_ip_idx)
4739 continue;
4740 err = inet6_fill_ifmcaddr(skb, ifmca,
15e47304 4741 NETLINK_CB(cb->skb).portid,
234b27c3
ED		 4742 cb->nlh->nlmsg_seq,
4743 RTM_GETMULTICAST,
4744 NLM_F_MULTI);
053c095a 4745 if (err < 0)
234b27c3
ED		 4746 break;
4747 }
4748 break;
4749 case ANYCAST_ADDR:
4750 /* anycast address */
4751 for (ifaca = idev->ac_list; ifaca;
4752 ifaca = ifaca->aca_next, ip_idx++) {
4753 if (ip_idx < s_ip_idx)
4754 continue;
4755 err = inet6_fill_ifacaddr(skb, ifaca,
15e47304 4756 NETLINK_CB(cb->skb).portid,
234b27c3
ED		 4757 cb->nlh->nlmsg_seq,
4758 RTM_GETANYCAST,
4759 NLM_F_MULTI);
053c095a 4760 if (err < 0)
234b27c3
ED		 4761 break;
4762 }
4763 break;
4764 default:
4765 break;
4766 }
4767 read_unlock_bh(&idev->lock);
4768 *p_ip_idx = ip_idx;
4769 return err;
4770}
4771
1da177e4
LT		 4772static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
4773 enum addr_type_t type)
4774{
234b27c3
ED		 4775 struct net *net = sock_net(skb->sk);
4776 int h, s_h;
1da177e4
LT		 4777 int idx, ip_idx;
4778 int s_idx, s_ip_idx;
1da177e4 4779 struct net_device *dev;
234b27c3
ED		 4780 struct inet6_dev *idev;
4781 struct hlist_head *head;
1ab1457c 4782
234b27c3
ED		 4783 s_h = cb->args[0];
4784 s_idx = idx = cb->args[1];
4785 s_ip_idx = ip_idx = cb->args[2];
5d5619b4 4786
234b27c3 4787 rcu_read_lock();
63998ac2 4788 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ net->dev_base_seq;
234b27c3
ED		 4789 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4790 idx = 0;
4791 head = &net->dev_index_head[h];
b67bfe0d 4792 hlist_for_each_entry_rcu(dev, head, index_hlist) {
234b27c3
ED		 4793 if (idx < s_idx)
4794 goto cont;
4b97efdf 4795 if (h > s_h || idx > s_idx)
234b27c3
ED		 4796 s_ip_idx = 0;
4797 ip_idx = 0;
e21e8467
SH		 4798 idev = __in6_dev_get(dev);
4799 if (!idev)
234b27c3
ED		 4800 goto cont;
4801
4802 if (in6_dump_addrs(idev, skb, cb, type,
7b46a644 4803 s_ip_idx, &ip_idx) < 0)
234b27c3 4804 goto done;
7562f876 4805cont:
234b27c3
ED		 4806 idx++;
4807 }
1da177e4 4808 }
234b27c3
ED		 4809done:
4810 rcu_read_unlock();
4811 cb->args[0] = h;
4812 cb->args[1] = idx;
4813 cb->args[2] = ip_idx;
4814
1da177e4
LT		 4815 return skb->len;
4816}
4817
4818static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
4819{
4820 enum addr_type_t type = UNICAST_ADDR;
b854272b 4821
1da177e4
LT		 4822 return inet6_dump_addr(skb, cb, type);
4823}
4824
4825static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
4826{
4827 enum addr_type_t type = MULTICAST_ADDR;
b854272b 4828
1da177e4
LT		 4829 return inet6_dump_addr(skb, cb, type);
4830}
4831
4832
4833static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
4834{
4835 enum addr_type_t type = ANYCAST_ADDR;
b854272b 4836
1da177e4
LT		 4837 return inet6_dump_addr(skb, cb, type);
4838}
4839
661d2967 4840static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh)
6c223828 4841{
3b1e0a65 4842 struct net *net = sock_net(in_skb->sk);
1b29fc2c
TG		 4843 struct ifaddrmsg *ifm;
4844 struct nlattr *tb[IFA_MAX+1];
caeaba79 4845 struct in6_addr *addr = NULL, *peer;
6c223828
NT		 4846 struct net_device *dev = NULL;
4847 struct inet6_ifaddr *ifa;
4848 struct sk_buff *skb;
6c223828
NT		 4849 int err;
4850
1b29fc2c
TG		 4851 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
4852 if (err < 0)
4853 goto errout;
4854
caeaba79 4855 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer);
63159f29 4856 if (!addr) {
1b29fc2c
TG		 4857 err = -EINVAL;
4858 goto errout;
6c223828 4859 }
6c223828 4860
1b29fc2c 4861 ifm = nlmsg_data(nlh);
6c223828 4862 if (ifm->ifa_index)
6fda7350 4863 dev = __dev_get_by_index(net, ifm->ifa_index);
6c223828 4864
e21e8467
SH		 4865 ifa = ipv6_get_ifaddr(net, addr, dev, 1);
4866 if (!ifa) {
1b29fc2c
TG		 4867 err = -EADDRNOTAVAIL;
4868 goto errout;
4869 }
6c223828 4870
e21e8467
SH		 4871 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
4872 if (!skb) {
6c223828 4873 err = -ENOBUFS;
1b29fc2c 4874 goto errout_ifa;
6c223828
NT		 4875 }
4876
15e47304 4877 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).portid,
6c223828 4878 nlh->nlmsg_seq, RTM_NEWADDR, 0);
26932566
PM		 4879 if (err < 0) {
4880 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4881 WARN_ON(err == -EMSGSIZE);
4882 kfree_skb(skb);
4883 goto errout_ifa;
4884 }
15e47304 4885 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
1b29fc2c 4886errout_ifa:
6c223828 4887 in6_ifa_put(ifa);
1b29fc2c 4888errout:
6c223828 4889 return err;
6c223828
NT		 4890}
4891
1da177e4
LT		 4892static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
4893{
4894 struct sk_buff *skb;
c346dca1 4895 struct net *net = dev_net(ifa->idev->dev);
5d620266 4896 int err = -ENOBUFS;
1da177e4 4897
f784ad3d
MB		 4898 /* Don't send DELADDR notification for TENTATIVE address,
4899 * since NEWADDR notification is sent only after removing
4900 * TENTATIVE flag.
4901 */
4902 if (ifa->flags & IFA_F_TENTATIVE && event == RTM_DELADDR)
4903 return;
4904
0ab6803b 4905 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
63159f29 4906 if (!skb)
5d620266
TG		 4907 goto errout;
4908
4909 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
26932566
PM		 4910 if (err < 0) {
4911 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4912 WARN_ON(err == -EMSGSIZE);
4913 kfree_skb(skb);
4914 goto errout;
4915 }
1ce85fe4
PNA		 4916 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
4917 return;
5d620266
TG		 4918errout:
4919 if (err < 0)
6fda7350 4920 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
1da177e4
LT		 4921}
4922
b6f99a21 4923static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
1da177e4
LT		 4924 __s32 *array, int bytes)
4925{
04561c1f
TG		 4926 BUG_ON(bytes < (DEVCONF_MAX * 4));
4927
1da177e4
LT		 4928 memset(array, 0, bytes);
4929 array[DEVCONF_FORWARDING] = cnf->forwarding;
4930 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
4931 array[DEVCONF_MTU6] = cnf->mtu6;
4932 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
4933 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
4934 array[DEVCONF_AUTOCONF] = cnf->autoconf;
4935 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
4936 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
93908d19
TG		 4937 array[DEVCONF_RTR_SOLICIT_INTERVAL] =
4938 jiffies_to_msecs(cnf->rtr_solicit_interval);
bd11f074
MŻ		 4939 array[DEVCONF_RTR_SOLICIT_MAX_INTERVAL] =
4940 jiffies_to_msecs(cnf->rtr_solicit_max_interval);
93908d19
TG		 4941 array[DEVCONF_RTR_SOLICIT_DELAY] =
4942 jiffies_to_msecs(cnf->rtr_solicit_delay);
1da177e4 4943 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
fc4eba58
HFS		 4944 array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] =
4945 jiffies_to_msecs(cnf->mldv1_unsolicited_report_interval);
4946 array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] =
4947 jiffies_to_msecs(cnf->mldv2_unsolicited_report_interval);
1da177e4
LT		 4948 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
4949 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
4950 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
4951 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
4952 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
1da177e4 4953 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
65f5c7c1 4954 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
8013d1d7 4955 array[DEVCONF_ACCEPT_RA_MIN_HOP_LIMIT] = cnf->accept_ra_min_hop_limit;
c4fd30eb 4956 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
930d6ff2
YH		 4957#ifdef CONFIG_IPV6_ROUTER_PREF
4958 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
93908d19
TG		 4959 array[DEVCONF_RTR_PROBE_INTERVAL] =
4960 jiffies_to_msecs(cnf->rtr_probe_interval);
fa03ef38 4961#ifdef CONFIG_IPV6_ROUTE_INFO
09c884d4
YH		 4962 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
4963#endif
930d6ff2 4964#endif
fbea49e1 4965 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
0bcbc926 4966 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
95c385b4
NH		 4967#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4968 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
7fd2561e 4969 array[DEVCONF_USE_OPTIMISTIC] = cnf->use_optimistic;
95c385b4 4970#endif
7bc570c8
YH		 4971#ifdef CONFIG_IPV6_MROUTE
4972 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
4973#endif
778d80be 4974 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
1b34be74 4975 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
c3faca05 4976 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
5cb04436 4977 array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify;
b800c3b9 4978 array[DEVCONF_SUPPRESS_FRAG_NDISC] = cnf->suppress_frag_ndisc;
d9333196 4979 array[DEVCONF_ACCEPT_RA_FROM_LOCAL] = cnf->accept_ra_from_local;
c2943f14 4980 array[DEVCONF_ACCEPT_RA_MTU] = cnf->accept_ra_mtu;
35103d11 4981 array[DEVCONF_IGNORE_ROUTES_WITH_LINKDOWN] = cnf->ignore_routes_with_linkdown;
3d1bec99 4982 /* we omit DEVCONF_STABLE_SECRET for now */
3985e8a3 4983 array[DEVCONF_USE_OIF_ADDRS_ONLY] = cnf->use_oif_addrs_only;
abbc3043 4984 array[DEVCONF_DROP_UNICAST_IN_L2_MULTICAST] = cnf->drop_unicast_in_l2_multicast;
7a02bf89 4985 array[DEVCONF_DROP_UNSOLICITED_NA] = cnf->drop_unsolicited_na;
f1705ec1 4986 array[DEVCONF_KEEP_ADDR_ON_DOWN] = cnf->keep_addr_on_down;
1ababeba 4987 array[DEVCONF_SEG6_ENABLED] = cnf->seg6_enabled;
bf355b8d
DL		 4988#ifdef CONFIG_IPV6_SEG6_HMAC
4989 array[DEVCONF_SEG6_REQUIRE_HMAC] = cnf->seg6_require_hmac;
4990#endif
adc176c5 4991 array[DEVCONF_ENHANCED_DAD] = cnf->enhanced_dad;
d35a00b8 4992 array[DEVCONF_ADDR_GEN_MODE] = cnf->addr_gen_mode;
1da177e4
LT		 4993}
4994
b382b191
TG		 4995static inline size_t inet6_ifla6_size(void)
4996{
4997 return nla_total_size(4) /* IFLA_INET6_FLAGS */
4998 + nla_total_size(sizeof(struct ifla_cacheinfo))
4999 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
5000 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
f53adae4
DB		 5001 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
5002 + nla_total_size(sizeof(struct in6_addr)); /* IFLA_INET6_TOKEN */
b382b191
TG		 5003}
5004
339bf98f
TG		 5005static inline size_t inet6_if_nlmsg_size(void)
5006{
5007 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
5008 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
5009 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
5010 + nla_total_size(4) /* IFLA_MTU */
5011 + nla_total_size(4) /* IFLA_LINK */
0344338b 5012 + nla_total_size(1) /* IFLA_OPERSTATE */
b382b191 5013 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */
339bf98f 5014}
c5396a31 5015
be281e55 5016static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib,
aca05671 5017 int bytes)
7f7d9a6b
HX		 5018{
5019 int i;
aca05671 5020 int pad = bytes - sizeof(u64) * ICMP6_MIB_MAX;
7f7d9a6b
HX		 5021 BUG_ON(pad < 0);
5022
5023 /* Use put_unaligned() because stats may not be aligned for u64. */
aca05671
JH		 5024 put_unaligned(ICMP6_MIB_MAX, &stats[0]);
5025 for (i = 1; i < ICMP6_MIB_MAX; i++)
be281e55 5026 put_unaligned(atomic_long_read(&mib[i]), &stats[i]);
7f7d9a6b 5027
aca05671 5028 memset(&stats[ICMP6_MIB_MAX], 0, pad);
7f7d9a6b
HX		 5029}
5030
698365fa 5031static inline void __snmp6_fill_stats64(u64 *stats, void __percpu *mib,
a3a77372 5032 int bytes, size_t syncpoff)
4ce3c183 5033{
a3a77372
R		 5034 int i, c;
5035 u64 buff[IPSTATS_MIB_MAX];
5036 int pad = bytes - sizeof(u64) * IPSTATS_MIB_MAX;
5037
4ce3c183
ED		 5038 BUG_ON(pad < 0);
5039
a3a77372
R		 5040 memset(buff, 0, sizeof(buff));
5041 buff[0] = IPSTATS_MIB_MAX;
4ce3c183 5042
a3a77372
R		 5043 for_each_possible_cpu(c) {
5044 for (i = 1; i < IPSTATS_MIB_MAX; i++)
5045 buff[i] += snmp_get_cpu_field64(mib, c, i, syncpoff);
5046 }
5047
5048 memcpy(stats, buff, IPSTATS_MIB_MAX * sizeof(u64));
5049 memset(&stats[IPSTATS_MIB_MAX], 0, pad);
4ce3c183
ED		 5050}
5051
7f7d9a6b
HX		 5052static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
5053 int bytes)
5054{
e21e8467 5055 switch (attrtype) {
7f7d9a6b 5056 case IFLA_INET6_STATS:
a3a77372
R		 5057 __snmp6_fill_stats64(stats, idev->stats.ipv6, bytes,
5058 offsetof(struct ipstats_mib, syncp));
7f7d9a6b
HX		 5059 break;
5060 case IFLA_INET6_ICMP6STATS:
aca05671 5061 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, bytes);
7f7d9a6b
HX		 5062 break;
5063 }
5064}
5065
d5566fd7
SV		 5066static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev,
5067 u32 ext_filter_mask)
b382b191
TG		 5068{
5069 struct nlattr *nla;
5070 struct ifla_cacheinfo ci;
5071
c78679e8
DM		 5072 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags))
5073 goto nla_put_failure;
b382b191 5074 ci.max_reasm_len = IPV6_MAXPLEN;
24912420
DM		 5075 ci.tstamp = cstamp_delta(idev->tstamp);
5076 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time);
1f9248e5 5077 ci.retrans_time = jiffies_to_msecs(NEIGH_VAR(idev->nd_parms, RETRANS_TIME));
c78679e8
DM		 5078 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci))
5079 goto nla_put_failure;
b382b191 5080 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
63159f29 5081 if (!nla)
b382b191
TG		 5082 goto nla_put_failure;
5083 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
5084
5085 /* XXX - MC not implemented */
5086
d5566fd7
SV		 5087 if (ext_filter_mask & RTEXT_FILTER_SKIP_STATS)
5088 return 0;
5089
b382b191 5090 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
63159f29 5091 if (!nla)
b382b191
TG		 5092 goto nla_put_failure;
5093 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
5094
5095 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
63159f29 5096 if (!nla)
b382b191
TG		 5097 goto nla_put_failure;
5098 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
5099
f53adae4 5100 nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr));
63159f29 5101 if (!nla)
f53adae4 5102 goto nla_put_failure;
bc91b0f0 5103
d35a00b8 5104 if (nla_put_u8(skb, IFLA_INET6_ADDR_GEN_MODE, idev->cnf.addr_gen_mode))
bc91b0f0
JP		 5105 goto nla_put_failure;
5106
f53adae4
DB		 5107 read_lock_bh(&idev->lock);
5108 memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla));
5109 read_unlock_bh(&idev->lock);
5110
b382b191
TG		 5111 return 0;
5112
5113nla_put_failure:
5114 return -EMSGSIZE;
5115}
5116
b1974ed0
AR		 5117static size_t inet6_get_link_af_size(const struct net_device *dev,
5118 u32 ext_filter_mask)
b382b191
TG		 5119{
5120 if (!__in6_dev_get(dev))
5121 return 0;
5122
5123 return inet6_ifla6_size();
5124}
5125
d5566fd7
SV		 5126static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev,
5127 u32 ext_filter_mask)
b382b191
TG		 5128{
5129 struct inet6_dev *idev = __in6_dev_get(dev);
5130
5131 if (!idev)
5132 return -ENODATA;
5133
d5566fd7 5134 if (inet6_fill_ifla6_attrs(skb, idev, ext_filter_mask) < 0)
b382b191
TG		 5135 return -EMSGSIZE;
5136
5137 return 0;
5138}
5139
f53adae4
DB		 5140static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token)
5141{
f53adae4
DB		 5142 struct inet6_ifaddr *ifp;
5143 struct net_device *dev = idev->dev;
47e27d5e 5144 bool clear_token, update_rs = false;
dc848292 5145 struct in6_addr ll_addr;
f53adae4 5146
c15b1cca
HFS		 5147 ASSERT_RTNL();
5148
63159f29 5149 if (!token)
f53adae4 5150 return -EINVAL;
f53adae4
DB		 5151 if (dev->flags & (IFF_LOOPBACK | IFF_NOARP))
5152 return -EINVAL;
f53adae4
DB		 5153 if (!ipv6_accept_ra(idev))
5154 return -EINVAL;
bd11f074 5155 if (idev->cnf.rtr_solicits == 0)
f53adae4
DB		 5156 return -EINVAL;
5157
5158 write_lock_bh(&idev->lock);
5159
5160 BUILD_BUG_ON(sizeof(token->s6_addr) != 16);
5161 memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8);
5162
5163 write_unlock_bh(&idev->lock);
5164
47e27d5e
DB		 5165 clear_token = ipv6_addr_any(token);
5166 if (clear_token)
5167 goto update_lft;
5168
dc848292
HFS		 5169 if (!idev->dead && (idev->if_flags & IF_READY) &&
5170 !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE |
5171 IFA_F_OPTIMISTIC)) {
fc403832
DB		 5172 /* If we're not ready, then normal ifup will take care
5173 * of this. Otherwise, we need to request our rs here.
5174 */
5175 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters);
5176 update_rs = true;
5177 }
f53adae4 5178
47e27d5e 5179update_lft:
f53adae4 5180 write_lock_bh(&idev->lock);
fc403832 5181
77ecaace 5182 if (update_rs) {
fc403832 5183 idev->if_flags |= IF_RS_SENT;
bd11f074
MŻ		 5184 idev->rs_interval = rfc3315_s14_backoff_init(
5185 idev->cnf.rtr_solicit_interval);
77ecaace 5186 idev->rs_probes = 1;
bd11f074 5187 addrconf_mod_rs_timer(idev, idev->rs_interval);
77ecaace 5188 }
f53adae4
DB		 5189
5190 /* Well, that's kinda nasty ... */
5191 list_for_each_entry(ifp, &idev->addr_list, if_list) {
5192 spin_lock(&ifp->lock);
617fe29d 5193 if (ifp->tokenized) {
f53adae4
DB		 5194 ifp->valid_lft = 0;
5195 ifp->prefered_lft = 0;
5196 }
5197 spin_unlock(&ifp->lock);
5198 }
5199
5200 write_unlock_bh(&idev->lock);
b2ed64a9 5201 inet6_ifinfo_notify(RTM_NEWLINK, idev);
c15b1cca 5202 addrconf_verify_rtnl();
f53adae4
DB		 5203 return 0;
5204}
5205
11b1f828
DB		 5206static const struct nla_policy inet6_af_policy[IFLA_INET6_MAX + 1] = {
5207 [IFLA_INET6_ADDR_GEN_MODE] = { .type = NLA_U8 },
5208 [IFLA_INET6_TOKEN] = { .len = sizeof(struct in6_addr) },
5209};
5210
5211static int inet6_validate_link_af(const struct net_device *dev,
5212 const struct nlattr *nla)
5213{
5214 struct nlattr *tb[IFLA_INET6_MAX + 1];
5215
5216 if (dev && !__in6_dev_get(dev))
5217 return -EAFNOSUPPORT;
5218
5219 return nla_parse_nested(tb, IFLA_INET6_MAX, nla, inet6_af_policy);
5220}
5221
d35a00b8
FJ		 5222static int check_addr_gen_mode(int mode)
5223{
5224 if (mode != IN6_ADDR_GEN_MODE_EUI64 &&
5225 mode != IN6_ADDR_GEN_MODE_NONE &&
5226 mode != IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
5227 mode != IN6_ADDR_GEN_MODE_RANDOM)
5228 return -EINVAL;
5229 return 1;
5230}
5231
5232static int check_stable_privacy(struct inet6_dev *idev, struct net *net,
5233 int mode)
5234{
5235 if (mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
5236 !idev->cnf.stable_secret.initialized &&
5237 !net->ipv6.devconf_dflt->stable_secret.initialized)
5238 return -EINVAL;
5239 return 1;
5240}
5241
f53adae4
DB		 5242static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla)
5243{
5244 int err = -EINVAL;
5245 struct inet6_dev *idev = __in6_dev_get(dev);
5246 struct nlattr *tb[IFLA_INET6_MAX + 1];
5247
5248 if (!idev)
5249 return -EAFNOSUPPORT;
5250
5251 if (nla_parse_nested(tb, IFLA_INET6_MAX, nla, NULL) < 0)
5252 BUG();
5253
bc91b0f0 5254 if (tb[IFLA_INET6_TOKEN]) {
f53adae4 5255 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN]));
bc91b0f0
JP		 5256 if (err)
5257 return err;
5258 }
5259
5260 if (tb[IFLA_INET6_ADDR_GEN_MODE]) {
5261 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]);
5262
d35a00b8
FJ		 5263 if (check_addr_gen_mode(mode) < 0 ||
5264 check_stable_privacy(idev, dev_net(dev), mode) < 0)
bc91b0f0 5265 return -EINVAL;
622c81d5 5266
d35a00b8 5267 idev->cnf.addr_gen_mode = mode;
bc91b0f0
JP		 5268 err = 0;
5269 }
f53adae4
DB		 5270
5271 return err;
5272}
5273
1ab1457c 5274static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
15e47304 5275 u32 portid, u32 seq, int event, unsigned int flags)
1da177e4 5276{
04561c1f 5277 struct net_device *dev = idev->dev;
04561c1f
TG		 5278 struct ifinfomsg *hdr;
5279 struct nlmsghdr *nlh;
5280 void *protoinfo;
04561c1f 5281
15e47304 5282 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags);
63159f29 5283 if (!nlh)
26932566 5284 return -EMSGSIZE;
04561c1f
TG		 5285
5286 hdr = nlmsg_data(nlh);
5287 hdr->ifi_family = AF_INET6;
5288 hdr->__ifi_pad = 0;
5289 hdr->ifi_type = dev->type;
5290 hdr->ifi_index = dev->ifindex;
5291 hdr->ifi_flags = dev_get_flags(dev);
5292 hdr->ifi_change = 0;
5293
c78679e8
DM		 5294 if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
5295 (dev->addr_len &&
5296 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
5297 nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
a54acb3a 5298 (dev->ifindex != dev_get_iflink(dev) &&
0344338b
AG		 5299 nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))) ||
5300 nla_put_u8(skb, IFLA_OPERSTATE,
5301 netif_running(dev) ? dev->operstate : IF_OPER_DOWN))
c78679e8 5302 goto nla_put_failure;
04561c1f 5303 protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
63159f29 5304 if (!protoinfo)
04561c1f 5305 goto nla_put_failure;
1da177e4 5306
d5566fd7 5307 if (inet6_fill_ifla6_attrs(skb, idev, 0) < 0)
bf99f1bd 5308 goto nla_put_failure;
1da177e4 5309
04561c1f 5310 nla_nest_end(skb, protoinfo);
053c095a
JB		 5311 nlmsg_end(skb, nlh);
5312 return 0;
1da177e4 5313
04561c1f 5314nla_put_failure:
26932566
PM		 5315 nlmsg_cancel(skb, nlh);
5316 return -EMSGSIZE;
1da177e4
LT		 5317}
5318
5319static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
5320{
3b1e0a65 5321 struct net *net = sock_net(skb->sk);
84d2697d 5322 int h, s_h;
434a8a58 5323 int idx = 0, s_idx;
1da177e4
LT		 5324 struct net_device *dev;
5325 struct inet6_dev *idev;
84d2697d 5326 struct hlist_head *head;
1da177e4 5327
84d2697d
ED		 5328 s_h = cb->args[0];
5329 s_idx = cb->args[1];
5330
5331 rcu_read_lock();
5332 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
5333 idx = 0;
5334 head = &net->dev_index_head[h];
b67bfe0d 5335 hlist_for_each_entry_rcu(dev, head, index_hlist) {
84d2697d
ED		 5336 if (idx < s_idx)
5337 goto cont;
5338 idev = __in6_dev_get(dev);
5339 if (!idev)
5340 goto cont;
5341 if (inet6_fill_ifinfo(skb, idev,
15e47304 5342 NETLINK_CB(cb->skb).portid,
84d2697d 5343 cb->nlh->nlmsg_seq,
053c095a 5344 RTM_NEWLINK, NLM_F_MULTI) < 0)
84d2697d 5345 goto out;
7562f876 5346cont:
84d2697d
ED		 5347 idx++;
5348 }
1da177e4 5349 }
84d2697d
ED		 5350out:
5351 rcu_read_unlock();
5352 cb->args[1] = idx;
5353 cb->args[0] = h;
1da177e4
LT		 5354
5355 return skb->len;
5356}
5357
5358void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
5359{
5360 struct sk_buff *skb;
c346dca1 5361 struct net *net = dev_net(idev->dev);
8d7a76c9 5362 int err = -ENOBUFS;
1ab1457c 5363
339bf98f 5364 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
63159f29 5365 if (!skb)
8d7a76c9
TG		 5366 goto errout;
5367
5368 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
26932566
PM		 5369 if (err < 0) {
5370 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
5371 WARN_ON(err == -EMSGSIZE);
5372 kfree_skb(skb);
5373 goto errout;
5374 }
5f75a104 5375 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC);
1ce85fe4 5376 return;
8d7a76c9
TG		 5377errout:
5378 if (err < 0)
5f75a104 5379 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err);
1da177e4
LT		 5380}
5381
339bf98f
TG		 5382static inline size_t inet6_prefix_nlmsg_size(void)
5383{
5384 return NLMSG_ALIGN(sizeof(struct prefixmsg))
5385 + nla_total_size(sizeof(struct in6_addr))
5386 + nla_total_size(sizeof(struct prefix_cacheinfo));
5387}
c5396a31 5388
1da177e4 5389static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
15e47304 5390 struct prefix_info *pinfo, u32 portid, u32 seq,
6051e2f4 5391 int event, unsigned int flags)
1da177e4 5392{
6051e2f4
TG		 5393 struct prefixmsg *pmsg;
5394 struct nlmsghdr *nlh;
1da177e4
LT		 5395 struct prefix_cacheinfo ci;
5396
15e47304 5397 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags);
63159f29 5398 if (!nlh)
26932566 5399 return -EMSGSIZE;
6051e2f4
TG		 5400
5401 pmsg = nlmsg_data(nlh);
1da177e4 5402 pmsg->prefix_family = AF_INET6;
8a47077a
PM		 5403 pmsg->prefix_pad1 = 0;
5404 pmsg->prefix_pad2 = 0;
1da177e4
LT		 5405 pmsg->prefix_ifindex = idev->dev->ifindex;
5406 pmsg->prefix_len = pinfo->prefix_len;
5407 pmsg->prefix_type = pinfo->type;
8a47077a 5408 pmsg->prefix_pad3 = 0;
1da177e4
LT		 5409 pmsg->prefix_flags = 0;
5410 if (pinfo->onlink)
5411 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
5412 if (pinfo->autoconf)
5413 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
5414
c78679e8
DM		 5415 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix))
5416 goto nla_put_failure;
1da177e4
LT		 5417 ci.preferred_time = ntohl(pinfo->prefered);
5418 ci.valid_time = ntohl(pinfo->valid);
c78679e8
DM		 5419 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci))
5420 goto nla_put_failure;
053c095a
JB		 5421 nlmsg_end(skb, nlh);
5422 return 0;
1da177e4 5423
6051e2f4 5424nla_put_failure:
26932566
PM		 5425 nlmsg_cancel(skb, nlh);
5426 return -EMSGSIZE;
1da177e4
LT		 5427}
5428
1ab1457c 5429static void inet6_prefix_notify(int event, struct inet6_dev *idev,
1da177e4
LT		 5430 struct prefix_info *pinfo)
5431{
5432 struct sk_buff *skb;
c346dca1 5433 struct net *net = dev_net(idev->dev);
8c384bfa 5434 int err = -ENOBUFS;
1da177e4 5435
339bf98f 5436 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
63159f29 5437 if (!skb)
8c384bfa
TG		 5438 goto errout;
5439
5440 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
26932566
PM		 5441 if (err < 0) {
5442 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
5443 WARN_ON(err == -EMSGSIZE);
5444 kfree_skb(skb);
5445 goto errout;
5446 }
1ce85fe4
PNA		 5447 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
5448 return;
8c384bfa
TG		 5449errout:
5450 if (err < 0)
6fda7350 5451 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
1da177e4
LT		 5452}
5453
1da177e4
LT		 5454static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
5455{
63998ac2
ND		 5456 struct net *net = dev_net(ifp->idev->dev);
5457
c15b1cca
HFS		 5458 if (event)
5459 ASSERT_RTNL();
5460
1da177e4
LT		 5461 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
5462
5463 switch (event) {
5464 case RTM_NEWADDR:
95c385b4
NH		 5465 /*
5466 * If the address was optimistic
5467 * we inserted the route at the start of
5468 * our DAD process, so we don't need
5469 * to do it again
5470 */
5471 if (!(ifp->rt->rt6i_node))
5472 ip6_ins_rt(ifp->rt);
1da177e4
LT		 5473 if (ifp->idev->cnf.forwarding)
5474 addrconf_join_anycast(ifp);
7996c799 5475 if (!ipv6_addr_any(&ifp->peer_addr))
caeaba79
ND		 5476 addrconf_prefix_route(&ifp->peer_addr, 128,
5477 ifp->idev->dev, 0, 0);
1da177e4
LT		 5478 break;
5479 case RTM_DELADDR:
5480 if (ifp->idev->cnf.forwarding)
5481 addrconf_leave_anycast(ifp);
5482 addrconf_leave_solict(ifp->idev, &ifp->addr);
7996c799 5483 if (!ipv6_addr_any(&ifp->peer_addr)) {
caeaba79 5484 struct rt6_info *rt;
caeaba79 5485
e7478dfc
ND		 5486 rt = addrconf_get_prefix_route(&ifp->peer_addr, 128,
5487 ifp->idev->dev, 0, 0);
8e3d5be7
MKL		 5488 if (rt)
5489 ip6_del_rt(rt);
caeaba79 5490 }
38bd10c4
DA		 5491 if (ifp->rt) {
5492 dst_hold(&ifp->rt->dst);
5493 ip6_del_rt(ifp->rt);
5494 }
705f1c86 5495 rt_genid_bump_ipv6(net);
1da177e4
LT		 5496 break;
5497 }
63998ac2 5498 atomic_inc(&net->ipv6.dev_addr_genid);
1da177e4
LT		 5499}
5500
5501static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
5502{
8814c4b5 5503 rcu_read_lock_bh();
1da177e4
LT		 5504 if (likely(ifp->idev->dead == 0))
5505 __ipv6_ifa_notify(event, ifp);
8814c4b5 5506 rcu_read_unlock_bh();
1da177e4
LT		 5507}
5508
5509#ifdef CONFIG_SYSCTL
5510
5511static
fe2c6338 5512int addrconf_sysctl_forward(struct ctl_table *ctl, int write,
1da177e4
LT		 5513 void __user *buffer, size_t *lenp, loff_t *ppos)
5514{
5515 int *valp = ctl->data;
5516 int val = *valp;
88af182e 5517 loff_t pos = *ppos;
fe2c6338 5518 struct ctl_table lctl;
1da177e4
LT		 5519 int ret;
5520
013d97e9
FR		 5521 /*
5522 * ctl->data points to idev->cnf.forwarding, we should
5523 * not modify it until we get the rtnl lock.
5524 */
5525 lctl = *ctl;
5526 lctl.data = &val;
5527
5528 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
1da177e4 5529
c8fecf22 5530 if (write)
b325fddb 5531 ret = addrconf_fixup_forwarding(ctl, valp, val);
88af182e
EB		 5532 if (ret)
5533 *ppos = pos;
1ab1457c 5534 return ret;
1da177e4
LT		 5535}
5536
77751427
ML		 5537static
5538int addrconf_sysctl_mtu(struct ctl_table *ctl, int write,
5539 void __user *buffer, size_t *lenp, loff_t *ppos)
5540{
5541 struct inet6_dev *idev = ctl->extra1;
5542 int min_mtu = IPV6_MIN_MTU;
5543 struct ctl_table lctl;
5544
5545 lctl = *ctl;
5546 lctl.extra1 = &min_mtu;
5547 lctl.extra2 = idev ? &idev->dev->mtu : NULL;
5548
5549 return proc_dointvec_minmax(&lctl, write, buffer, lenp, ppos);
5550}
5551
56d417b1
BH		 5552static void dev_disable_change(struct inet6_dev *idev)
5553{
75538c2b
CW		 5554 struct netdev_notifier_info info;
5555
56d417b1
BH		 5556 if (!idev || !idev->dev)
5557 return;
5558
75538c2b 5559 netdev_notifier_info_init(&info, idev->dev);
56d417b1 5560 if (idev->cnf.disable_ipv6)
75538c2b 5561 addrconf_notify(NULL, NETDEV_DOWN, &info);
56d417b1 5562 else
75538c2b 5563 addrconf_notify(NULL, NETDEV_UP, &info);
56d417b1
BH		 5564}
5565
5566static void addrconf_disable_change(struct net *net, __s32 newf)
5567{
5568 struct net_device *dev;
5569 struct inet6_dev *idev;
5570
03e4deff 5571 for_each_netdev(net, dev) {
56d417b1
BH		 5572 idev = __in6_dev_get(dev);
5573 if (idev) {
5574 int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
5575 idev->cnf.disable_ipv6 = newf;
5576 if (changed)
5577 dev_disable_change(idev);
5578 }
56d417b1 5579 }
56d417b1
BH		 5580}
5581
013d97e9 5582static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf)
56d417b1
BH		 5583{
5584 struct net *net;
013d97e9
FR		 5585 int old;
5586
5587 if (!rtnl_trylock())
5588 return restart_syscall();
56d417b1
BH		 5589
5590 net = (struct net *)table->extra2;
013d97e9
FR		 5591 old = *p;
5592 *p = newf;
56d417b1 5593
013d97e9
FR		 5594 if (p == &net->ipv6.devconf_dflt->disable_ipv6) {
5595 rtnl_unlock();
56d417b1 5596 return 0;
88af182e 5597 }
56d417b1
BH		 5598
5599 if (p == &net->ipv6.devconf_all->disable_ipv6) {
56d417b1
BH		 5600 net->ipv6.devconf_dflt->disable_ipv6 = newf;
5601 addrconf_disable_change(net, newf);
013d97e9 5602 } else if ((!newf) ^ (!old))
56d417b1
BH		 5603 dev_disable_change((struct inet6_dev *)table->extra1);
5604
5605 rtnl_unlock();
5606 return 0;
5607}
5608
5609static
fe2c6338 5610int addrconf_sysctl_disable(struct ctl_table *ctl, int write,
56d417b1
BH		 5611 void __user *buffer, size_t *lenp, loff_t *ppos)
5612{
5613 int *valp = ctl->data;
5614 int val = *valp;
88af182e 5615 loff_t pos = *ppos;
fe2c6338 5616 struct ctl_table lctl;
56d417b1
BH		 5617 int ret;
5618
013d97e9
FR		 5619 /*
5620 * ctl->data points to idev->cnf.disable_ipv6, we should
5621 * not modify it until we get the rtnl lock.
5622 */
5623 lctl = *ctl;
5624 lctl.data = &val;
5625
5626 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
56d417b1
BH		 5627
5628 if (write)
5629 ret = addrconf_disable_ipv6(ctl, valp, val);
88af182e
EB		 5630 if (ret)
5631 *ppos = pos;
56d417b1
BH		 5632 return ret;
5633}
5634
c92d5491 5635static
5636int addrconf_sysctl_proxy_ndp(struct ctl_table *ctl, int write,
5637 void __user *buffer, size_t *lenp, loff_t *ppos)
5638{
5639 int *valp = ctl->data;
5640 int ret;
5641 int old, new;
5642
5643 old = *valp;
5644 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
5645 new = *valp;
5646
5647 if (write && old != new) {
5648 struct net *net = ctl->extra2;
5649
5650 if (!rtnl_trylock())
5651 return restart_syscall();
5652
5653 if (valp == &net->ipv6.devconf_dflt->proxy_ndp)
5654 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
5655 NETCONFA_IFINDEX_DEFAULT,
5656 net->ipv6.devconf_dflt);
5657 else if (valp == &net->ipv6.devconf_all->proxy_ndp)
5658 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
5659 NETCONFA_IFINDEX_ALL,
5660 net->ipv6.devconf_all);
5661 else {
5662 struct inet6_dev *idev = ctl->extra1;
5663
5664 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
5665 idev->dev->ifindex,
5666 &idev->cnf);
5667 }
5668 rtnl_unlock();
5669 }
5670
5671 return ret;
5672}
5673
d35a00b8
FJ		 5674static int addrconf_sysctl_addr_gen_mode(struct ctl_table *ctl, int write,
5675 void __user *buffer, size_t *lenp,
5676 loff_t *ppos)
5677{
5678 int ret = 0;
5679 int new_val;
5680 struct inet6_dev *idev = (struct inet6_dev *)ctl->extra1;
5681 struct net *net = (struct net *)ctl->extra2;
5682
5683 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
5684
5685 if (write) {
5686 new_val = *((int *)ctl->data);
5687
5688 if (check_addr_gen_mode(new_val) < 0)
5689 return -EINVAL;
5690
5691 /* request for default */
5692 if (&net->ipv6.devconf_dflt->addr_gen_mode == ctl->data) {
5693 ipv6_devconf_dflt.addr_gen_mode = new_val;
5694
5695 /* request for individual net device */
5696 } else {
5697 if (!idev)
5698 return ret;
5699
5700 if (check_stable_privacy(idev, net, new_val) < 0)
5701 return -EINVAL;
5702
5703 if (idev->cnf.addr_gen_mode != new_val) {
5704 idev->cnf.addr_gen_mode = new_val;
5705 rtnl_lock();
5706 addrconf_dev_config(idev->dev);
5707 rtnl_unlock();
5708 }
5709 }
5710 }
5711
5712 return ret;
5713}
5714
3d1bec99
HFS		 5715static int addrconf_sysctl_stable_secret(struct ctl_table *ctl, int write,
5716 void __user *buffer, size_t *lenp,
5717 loff_t *ppos)
5718{
5719 int err;
5720 struct in6_addr addr;
5721 char str[IPV6_MAX_STRLEN];
5722 struct ctl_table lctl = *ctl;
622c81d5 5723 struct net *net = ctl->extra2;
3d1bec99
HFS		 5724 struct ipv6_stable_secret *secret = ctl->data;
5725
622c81d5
HFS		 5726 if (&net->ipv6.devconf_all->stable_secret == ctl->data)
5727 return -EIO;
5728
3d1bec99
HFS		 5729 lctl.maxlen = IPV6_MAX_STRLEN;
5730 lctl.data = str;
5731
5732 if (!rtnl_trylock())
5733 return restart_syscall();
5734
5735 if (!write && !secret->initialized) {
5736 err = -EIO;
5737 goto out;
5738 }
5739
5449a5ca
WC		 5740 err = snprintf(str, sizeof(str), "%pI6", &secret->secret);
5741 if (err >= sizeof(str)) {
5742 err = -EIO;
5743 goto out;
3d1bec99
HFS		 5744 }
5745
5746 err = proc_dostring(&lctl, write, buffer, lenp, ppos);
5747 if (err || !write)
5748 goto out;
5749
5750 if (in6_pton(str, -1, addr.in6_u.u6_addr8, -1, NULL) != 1) {
5751 err = -EIO;
5752 goto out;
5753 }
5754
5755 secret->initialized = true;
5756 secret->secret = addr;
5757
622c81d5
HFS		 5758 if (&net->ipv6.devconf_dflt->stable_secret == ctl->data) {
5759 struct net_device *dev;
5760
5761 for_each_netdev(net, dev) {
5762 struct inet6_dev *idev = __in6_dev_get(dev);
5763
5764 if (idev) {
d35a00b8 5765 idev->cnf.addr_gen_mode =
622c81d5
HFS		 5766 IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
5767 }
5768 }
5769 } else {
5770 struct inet6_dev *idev = ctl->extra1;
5771
d35a00b8 5772 idev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
622c81d5
HFS		 5773 }
5774
3d1bec99
HFS		 5775out:
5776 rtnl_unlock();
5777
5778 return err;
5779}
c92d5491 5780
35103d11
AG		 5781static
5782int addrconf_sysctl_ignore_routes_with_linkdown(struct ctl_table *ctl,
5783 int write,
5784 void __user *buffer,
5785 size_t *lenp,
5786 loff_t *ppos)
5787{
5788 int *valp = ctl->data;
5789 int val = *valp;
5790 loff_t pos = *ppos;
5791 struct ctl_table lctl;
5792 int ret;
5793
5794 /* ctl->data points to idev->cnf.ignore_routes_when_linkdown
5795 * we should not modify it until we get the rtnl lock.
5796 */
5797 lctl = *ctl;
5798 lctl.data = &val;
5799
5800 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
5801
5802 if (write)
5803 ret = addrconf_fixup_linkdown(ctl, valp, val);
5804 if (ret)
5805 *ppos = pos;
5806 return ret;
5807}
5808
cb4a4c69 5809static int minus_one = -1;
cb9e684e
MŻ		 5810static const int one = 1;
5811static const int two_five_five = 255;
5812
607ea7cd 5813static const struct ctl_table addrconf_sysctl[] = {
5df1f77f
KK		 5814 {
5815 .procname = "forwarding",
5816 .data = &ipv6_devconf.forwarding,
5817 .maxlen = sizeof(int),
5818 .mode = 0644,
5819 .proc_handler = addrconf_sysctl_forward,
5820 },
5821 {
5822 .procname = "hop_limit",
5823 .data = &ipv6_devconf.hop_limit,
5824 .maxlen = sizeof(int),
5825 .mode = 0644,
cb9e684e
MŻ		 5826 .proc_handler = proc_dointvec_minmax,
5827 .extra1 = (void *)&one,
5828 .extra2 = (void *)&two_five_five,
5df1f77f
KK		 5829 },
5830 {
5831 .procname = "mtu",
5832 .data = &ipv6_devconf.mtu6,
5833 .maxlen = sizeof(int),
5834 .mode = 0644,
5835 .proc_handler = addrconf_sysctl_mtu,
5836 },
5837 {
5838 .procname = "accept_ra",
5839 .data = &ipv6_devconf.accept_ra,
5840 .maxlen = sizeof(int),
5841 .mode = 0644,
5842 .proc_handler = proc_dointvec,
5843 },
5844 {
5845 .procname = "accept_redirects",
5846 .data = &ipv6_devconf.accept_redirects,
5847 .maxlen = sizeof(int),
5848 .mode = 0644,
5849 .proc_handler = proc_dointvec,
5850 },
5851 {
5852 .procname = "autoconf",
5853 .data = &ipv6_devconf.autoconf,
5854 .maxlen = sizeof(int),
5855 .mode = 0644,
5856 .proc_handler = proc_dointvec,
5857 },
5858 {
5859 .procname = "dad_transmits",
5860 .data = &ipv6_devconf.dad_transmits,
5861 .maxlen = sizeof(int),
5862 .mode = 0644,
5863 .proc_handler = proc_dointvec,
5864 },
5865 {
5866 .procname = "router_solicitations",
5867 .data = &ipv6_devconf.rtr_solicits,
5868 .maxlen = sizeof(int),
5869 .mode = 0644,
cb4a4c69
MŻ		 5870 .proc_handler = proc_dointvec_minmax,
5871 .extra1 = &minus_one,
5df1f77f
KK		 5872 },
5873 {
5874 .procname = "router_solicitation_interval",
5875 .data = &ipv6_devconf.rtr_solicit_interval,
5876 .maxlen = sizeof(int),
5877 .mode = 0644,
5878 .proc_handler = proc_dointvec_jiffies,
5879 },
bd11f074
MŻ		 5880 {
5881 .procname = "router_solicitation_max_interval",
5882 .data = &ipv6_devconf.rtr_solicit_max_interval,
5883 .maxlen = sizeof(int),
5884 .mode = 0644,
5885 .proc_handler = proc_dointvec_jiffies,
5886 },
5df1f77f
KK		 5887 {
5888 .procname = "router_solicitation_delay",
5889 .data = &ipv6_devconf.rtr_solicit_delay,
5890 .maxlen = sizeof(int),
5891 .mode = 0644,
5892 .proc_handler = proc_dointvec_jiffies,
5893 },
5894 {
5895 .procname = "force_mld_version",
5896 .data = &ipv6_devconf.force_mld_version,
5897 .maxlen = sizeof(int),
5898 .mode = 0644,
5899 .proc_handler = proc_dointvec,
5900 },
5901 {
5902 .procname = "mldv1_unsolicited_report_interval",
5903 .data =
5904 &ipv6_devconf.mldv1_unsolicited_report_interval,
5905 .maxlen = sizeof(int),
5906 .mode = 0644,
5907 .proc_handler = proc_dointvec_ms_jiffies,
5908 },
5909 {
5910 .procname = "mldv2_unsolicited_report_interval",
5911 .data =
5912 &ipv6_devconf.mldv2_unsolicited_report_interval,
5913 .maxlen = sizeof(int),
5914 .mode = 0644,
5915 .proc_handler = proc_dointvec_ms_jiffies,
5916 },
5917 {
5918 .procname = "use_tempaddr",
5919 .data = &ipv6_devconf.use_tempaddr,
5920 .maxlen = sizeof(int),
5921 .mode = 0644,
5922 .proc_handler = proc_dointvec,
5923 },
5924 {
5925 .procname = "temp_valid_lft",
5926 .data = &ipv6_devconf.temp_valid_lft,
5927 .maxlen = sizeof(int),
5928 .mode = 0644,
5929 .proc_handler = proc_dointvec,
5930 },
5931 {
5932 .procname = "temp_prefered_lft",
5933 .data = &ipv6_devconf.temp_prefered_lft,
5934 .maxlen = sizeof(int),
5935 .mode = 0644,
5936 .proc_handler = proc_dointvec,
5937 },
5938 {
5939 .procname = "regen_max_retry",
5940 .data = &ipv6_devconf.regen_max_retry,
5941 .maxlen = sizeof(int),
5942 .mode = 0644,
5943 .proc_handler = proc_dointvec,
5944 },
5945 {
5946 .procname = "max_desync_factor",
5947 .data = &ipv6_devconf.max_desync_factor,
5948 .maxlen = sizeof(int),
5949 .mode = 0644,
5950 .proc_handler = proc_dointvec,
5951 },
5952 {
5953 .procname = "max_addresses",
5954 .data = &ipv6_devconf.max_addresses,
5955 .maxlen = sizeof(int),
5956 .mode = 0644,
5957 .proc_handler = proc_dointvec,
5958 },
5959 {
5960 .procname = "accept_ra_defrtr",
5961 .data = &ipv6_devconf.accept_ra_defrtr,
5962 .maxlen = sizeof(int),
5963 .mode = 0644,
5964 .proc_handler = proc_dointvec,
5965 },
5966 {
5967 .procname = "accept_ra_min_hop_limit",
5968 .data = &ipv6_devconf.accept_ra_min_hop_limit,
5969 .maxlen = sizeof(int),
5970 .mode = 0644,
5971 .proc_handler = proc_dointvec,
5972 },
5973 {
5974 .procname = "accept_ra_pinfo",
5975 .data = &ipv6_devconf.accept_ra_pinfo,
5976 .maxlen = sizeof(int),
5977 .mode = 0644,
5978 .proc_handler = proc_dointvec,
5979 },
930d6ff2 5980#ifdef CONFIG_IPV6_ROUTER_PREF
5df1f77f
KK		 5981 {
5982 .procname = "accept_ra_rtr_pref",
5983 .data = &ipv6_devconf.accept_ra_rtr_pref,
5984 .maxlen = sizeof(int),
5985 .mode = 0644,
5986 .proc_handler = proc_dointvec,
5987 },
5988 {
5989 .procname = "router_probe_interval",
5990 .data = &ipv6_devconf.rtr_probe_interval,
5991 .maxlen = sizeof(int),
5992 .mode = 0644,
5993 .proc_handler = proc_dointvec_jiffies,
5994 },
fa03ef38 5995#ifdef CONFIG_IPV6_ROUTE_INFO
5df1f77f
KK		 5996 {
5997 .procname = "accept_ra_rt_info_max_plen",
5998 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
5999 .maxlen = sizeof(int),
6000 .mode = 0644,
6001 .proc_handler = proc_dointvec,
6002 },
09c884d4 6003#endif
930d6ff2 6004#endif
5df1f77f
KK		 6005 {
6006 .procname = "proxy_ndp",
6007 .data = &ipv6_devconf.proxy_ndp,
6008 .maxlen = sizeof(int),
6009 .mode = 0644,
6010 .proc_handler = addrconf_sysctl_proxy_ndp,
6011 },
6012 {
6013 .procname = "accept_source_route",
6014 .data = &ipv6_devconf.accept_source_route,
6015 .maxlen = sizeof(int),
6016 .mode = 0644,
6017 .proc_handler = proc_dointvec,
6018 },
95c385b4 6019#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
5df1f77f
KK		 6020 {
6021 .procname = "optimistic_dad",
6022 .data = &ipv6_devconf.optimistic_dad,
6023 .maxlen = sizeof(int),
6024 .mode = 0644,
6025 .proc_handler = proc_dointvec,
6026 },
6027 {
6028 .procname = "use_optimistic",
6029 .data = &ipv6_devconf.use_optimistic,
6030 .maxlen = sizeof(int),
6031 .mode = 0644,
6032 .proc_handler = proc_dointvec,
6033 },
7bc570c8
YH		 6034#endif
6035#ifdef CONFIG_IPV6_MROUTE
5df1f77f
KK		 6036 {
6037 .procname = "mc_forwarding",
6038 .data = &ipv6_devconf.mc_forwarding,
6039 .maxlen = sizeof(int),
6040 .mode = 0444,
6041 .proc_handler = proc_dointvec,
6042 },
95c385b4 6043#endif
5df1f77f
KK		 6044 {
6045 .procname = "disable_ipv6",
6046 .data = &ipv6_devconf.disable_ipv6,
6047 .maxlen = sizeof(int),
6048 .mode = 0644,
6049 .proc_handler = addrconf_sysctl_disable,
6050 },
6051 {
6052 .procname = "accept_dad",
6053 .data = &ipv6_devconf.accept_dad,
6054 .maxlen = sizeof(int),
6055 .mode = 0644,
6056 .proc_handler = proc_dointvec,
6057 },
6058 {
6059 .procname = "force_tllao",
6060 .data = &ipv6_devconf.force_tllao,
6061 .maxlen = sizeof(int),
6062 .mode = 0644,
6063 .proc_handler = proc_dointvec
6064 },
6065 {
6066 .procname = "ndisc_notify",
6067 .data = &ipv6_devconf.ndisc_notify,
6068 .maxlen = sizeof(int),
6069 .mode = 0644,
6070 .proc_handler = proc_dointvec
6071 },
6072 {
6073 .procname = "suppress_frag_ndisc",
6074 .data = &ipv6_devconf.suppress_frag_ndisc,
6075 .maxlen = sizeof(int),
6076 .mode = 0644,
6077 .proc_handler = proc_dointvec
6078 },
6079 {
6080 .procname = "accept_ra_from_local",
6081 .data = &ipv6_devconf.accept_ra_from_local,
6082 .maxlen = sizeof(int),
6083 .mode = 0644,
6084 .proc_handler = proc_dointvec,
6085 },
6086 {
6087 .procname = "accept_ra_mtu",
6088 .data = &ipv6_devconf.accept_ra_mtu,
6089 .maxlen = sizeof(int),
6090 .mode = 0644,
6091 .proc_handler = proc_dointvec,
6092 },
6093 {
6094 .procname = "stable_secret",
6095 .data = &ipv6_devconf.stable_secret,
6096 .maxlen = IPV6_MAX_STRLEN,
6097 .mode = 0600,
6098 .proc_handler = addrconf_sysctl_stable_secret,
6099 },
6100 {
6101 .procname = "use_oif_addrs_only",
6102 .data = &ipv6_devconf.use_oif_addrs_only,
6103 .maxlen = sizeof(int),
6104 .mode = 0644,
6105 .proc_handler = proc_dointvec,
6106 },
6107 {
6108 .procname = "ignore_routes_with_linkdown",
6109 .data = &ipv6_devconf.ignore_routes_with_linkdown,
6110 .maxlen = sizeof(int),
6111 .mode = 0644,
6112 .proc_handler = addrconf_sysctl_ignore_routes_with_linkdown,
6113 },
6114 {
6115 .procname = "drop_unicast_in_l2_multicast",
6116 .data = &ipv6_devconf.drop_unicast_in_l2_multicast,
6117 .maxlen = sizeof(int),
6118 .mode = 0644,
6119 .proc_handler = proc_dointvec,
6120 },
6121 {
6122 .procname = "drop_unsolicited_na",
6123 .data = &ipv6_devconf.drop_unsolicited_na,
6124 .maxlen = sizeof(int),
6125 .mode = 0644,
6126 .proc_handler = proc_dointvec,
6127 },
6128 {
6129 .procname = "keep_addr_on_down",
6130 .data = &ipv6_devconf.keep_addr_on_down,
6131 .maxlen = sizeof(int),
6132 .mode = 0644,
6133 .proc_handler = proc_dointvec,
6134
6135 },
1ababeba
DL		 6136 {
6137 .procname = "seg6_enabled",
6138 .data = &ipv6_devconf.seg6_enabled,
6139 .maxlen = sizeof(int),
6140 .mode = 0644,
6141 .proc_handler = proc_dointvec,
6142 },
bf355b8d
DL		 6143#ifdef CONFIG_IPV6_SEG6_HMAC
6144 {
6145 .procname = "seg6_require_hmac",
6146 .data = &ipv6_devconf.seg6_require_hmac,
6147 .maxlen = sizeof(int),
6148 .mode = 0644,
6149 .proc_handler = proc_dointvec,
6150 },
6151#endif
adc176c5
EN		 6152 {
6153 .procname = "enhanced_dad",
6154 .data = &ipv6_devconf.enhanced_dad,
6155 .maxlen = sizeof(int),
6156 .mode = 0644,
6157 .proc_handler = proc_dointvec,
6158 },
d35a00b8
FJ		 6159 {
6160 .procname = "addr_gen_mode",
6161 .data = &ipv6_devconf.addr_gen_mode,
6162 .maxlen = sizeof(int),
6163 .mode = 0644,
6164 .proc_handler = addrconf_sysctl_addr_gen_mode,
6165 },
5df1f77f
KK		 6166 {
6167 /* sentinel */
6168 }
1da177e4
LT		 6169};
6170
bff16c2f 6171static int __addrconf_sysctl_register(struct net *net, char *dev_name,
f8572d8f 6172 struct inet6_dev *idev, struct ipv6_devconf *p)
1da177e4 6173{
29c994e3 6174 int i, ifindex;
607ea7cd 6175 struct ctl_table *table;
6105e293 6176 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ];
1dab6222 6177
607ea7cd
KK		 6178 table = kmemdup(addrconf_sysctl, sizeof(addrconf_sysctl), GFP_KERNEL);
6179 if (!table)
f68635e6
PE		 6180 goto out;
6181
607ea7cd
KK		 6182 for (i = 0; table[i].data; i++) {
6183 table[i].data += (char *)p - (char *)&ipv6_devconf;
cb9e684e
MŻ		 6184 /* If one of these is already set, then it is not safe to
6185 * overwrite either of them: this makes proc_dointvec_minmax
6186 * usable.
6187 */
6188 if (!table[i].extra1 && !table[i].extra2) {
6189 table[i].extra1 = idev; /* embedded; no ref */
6190 table[i].extra2 = net;
6191 }
1da177e4 6192 }
1da177e4 6193
6105e293 6194 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name);
1da177e4 6195
607ea7cd
KK		 6196 p->sysctl_header = register_net_sysctl(net, path, table);
6197 if (!p->sysctl_header)
6105e293 6198 goto free;
f68635e6 6199
29c994e3
ND		 6200 if (!strcmp(dev_name, "all"))
6201 ifindex = NETCONFA_IFINDEX_ALL;
6202 else if (!strcmp(dev_name, "default"))
6203 ifindex = NETCONFA_IFINDEX_DEFAULT;
6204 else
6205 ifindex = idev->dev->ifindex;
6206 inet6_netconf_notify_devconf(net, NETCONFA_ALL, ifindex, p);
95897312 6207 return 0;
1da177e4 6208
f68635e6 6209free:
607ea7cd 6210 kfree(table);
f68635e6 6211out:
95897312 6212 return -ENOBUFS;
1da177e4
LT		 6213}
6214
408c4768
PE		 6215static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
6216{
607ea7cd 6217 struct ctl_table *table;
408c4768 6218
607ea7cd 6219 if (!p->sysctl_header)
408c4768
PE		 6220 return;
6221
607ea7cd
KK		 6222 table = p->sysctl_header->ctl_table_arg;
6223 unregister_net_sysctl_table(p->sysctl_header);
6224 p->sysctl_header = NULL;
6225 kfree(table);
408c4768
PE		 6226}
6227
a317a2f1 6228static int addrconf_sysctl_register(struct inet6_dev *idev)
f52295a9 6229{
a317a2f1
WC		 6230 int err;
6231
6232 if (!sysctl_dev_name_is_allowed(idev->dev->name))
6233 return -EINVAL;
6234
6235 err = neigh_sysctl_register(idev->dev, idev->nd_parms,
6236 &ndisc_ifinfo_sysctl_change);
6237 if (err)
6238 return err;
6239 err = __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
6240 idev, &idev->cnf);
6241 if (err)
6242 neigh_sysctl_unregister(idev->nd_parms);
6243
6244 return err;
f52295a9
PE		 6245}
6246
408c4768 6247static void addrconf_sysctl_unregister(struct inet6_dev *idev)
1da177e4 6248{
408c4768
PE		 6249 __addrconf_sysctl_unregister(&idev->cnf);
6250 neigh_sysctl_unregister(idev->nd_parms);
1da177e4
LT		 6251}
6252
6253
6254#endif
6255
2c8c1e72 6256static int __net_init addrconf_init_net(struct net *net)
e0da5a48 6257{
a79ca223 6258 int err = -ENOMEM;
e0da5a48
PE		 6259 struct ipv6_devconf *all, *dflt;
6260
a79ca223 6261 all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL);
63159f29 6262 if (!all)
a79ca223 6263 goto err_alloc_all;
e0da5a48 6264
a79ca223 6265 dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
63159f29 6266 if (!dflt)
a79ca223 6267 goto err_alloc_dflt;
e0da5a48 6268
a79ca223
HZ		 6269 /* these will be inherited by all namespaces */
6270 dflt->autoconf = ipv6_defaults.autoconf;
6271 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
e0da5a48 6272
3d1bec99
HFS		 6273 dflt->stable_secret.initialized = false;
6274 all->stable_secret.initialized = false;
6275
e0da5a48
PE		 6276 net->ipv6.devconf_all = all;
6277 net->ipv6.devconf_dflt = dflt;
6278
6279#ifdef CONFIG_SYSCTL
f8572d8f 6280 err = __addrconf_sysctl_register(net, "all", NULL, all);
e0da5a48
PE		 6281 if (err < 0)
6282 goto err_reg_all;
6283
f8572d8f 6284 err = __addrconf_sysctl_register(net, "default", NULL, dflt);
e0da5a48
PE		 6285 if (err < 0)
6286 goto err_reg_dflt;
6287#endif
6288 return 0;
6289
6290#ifdef CONFIG_SYSCTL
6291err_reg_dflt:
6292 __addrconf_sysctl_unregister(all);
6293err_reg_all:
6294 kfree(dflt);
6295#endif
6296err_alloc_dflt:
6297 kfree(all);
6298err_alloc_all:
6299 return err;
6300}
6301
2c8c1e72 6302static void __net_exit addrconf_exit_net(struct net *net)
e0da5a48
PE		 6303{
6304#ifdef CONFIG_SYSCTL
6305 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
6306 __addrconf_sysctl_unregister(net->ipv6.devconf_all);
6307#endif
73cf0e92 6308 kfree(net->ipv6.devconf_dflt);
6309 kfree(net->ipv6.devconf_all);
e0da5a48
PE		 6310}
6311
6312static struct pernet_operations addrconf_ops = {
6313 .init = addrconf_init_net,
6314 .exit = addrconf_exit_net,
6315};
6316
207895fd 6317static struct rtnl_af_ops inet6_ops __read_mostly = {
b382b191
TG		 6318 .family = AF_INET6,
6319 .fill_link_af = inet6_fill_link_af,
6320 .get_link_af_size = inet6_get_link_af_size,
11b1f828 6321 .validate_link_af = inet6_validate_link_af,
f53adae4 6322 .set_link_af = inet6_set_link_af,
b382b191
TG		 6323};
6324
1da177e4
LT		 6325/*
6326 * Init / cleanup code
6327 */
6328
6329int __init addrconf_init(void)
6330{
a317a2f1 6331 struct inet6_dev *idev;
c2e21293 6332 int i, err;
2a8cc6c8 6333
e21e8467
SH		 6334 err = ipv6_addr_label_init();
6335 if (err < 0) {
f3213831
JP		 6336 pr_crit("%s: cannot initialize default policy table: %d\n",
6337 __func__, err);
2cc6d2bf 6338 goto out;
2a8cc6c8 6339 }
1da177e4 6340
2cc6d2bf
NH		 6341 err = register_pernet_subsys(&addrconf_ops);
6342 if (err < 0)
6343 goto out_addrlabel;
e0da5a48 6344
c15b1cca
HFS		 6345 addrconf_wq = create_workqueue("ipv6_addrconf");
6346 if (!addrconf_wq) {
6347 err = -ENOMEM;
6348 goto out_nowq;
6349 }
6350
1da177e4
LT		 6351 /* The addrconf netdev notifier requires that loopback_dev
6352 * has it's ipv6 private information allocated and setup
6353 * before it can bring up and give link-local addresses
6354 * to other devices which are up.
6355 *
6356 * Unfortunately, loopback_dev is not necessarily the first
6357 * entry in the global dev_base list of net devices. In fact,
6358 * it is likely to be the very last entry on that list.
6359 * So this causes the notifier registry below to try and
6360 * give link-local addresses to all devices besides loopback_dev
6361 * first, then loopback_dev, which cases all the non-loopback_dev
6362 * devices to fail to get a link-local address.
6363 *
6364 * So, as a temporary fix, allocate the ipv6 structure for
6365 * loopback_dev first by hand.
6366 * Longer term, all of the dependencies ipv6 has upon the loopback
6367 * device and it being up should be removed.
6368 */
6369 rtnl_lock();
a317a2f1 6370 idev = ipv6_add_dev(init_net.loopback_dev);
1da177e4 6371 rtnl_unlock();
a317a2f1
WC		 6372 if (IS_ERR(idev)) {
6373 err = PTR_ERR(idev);
e0da5a48 6374 goto errlo;
a317a2f1 6375 }
1da177e4 6376
c2e21293 6377 for (i = 0; i < IN6_ADDR_HSIZE; i++)
6378 INIT_HLIST_HEAD(&inet6_addr_lst[i]);
6379
1da177e4
LT		 6380 register_netdevice_notifier(&ipv6_dev_notf);
6381
c15b1cca 6382 addrconf_verify();
c127ea2c 6383
3678a9d8 6384 rtnl_af_register(&inet6_ops);
b382b191 6385
c7ac8679
GR		 6386 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo,
6387 NULL);
c127ea2c
TG		 6388 if (err < 0)
6389 goto errout;
6390
6391 /* Only the first call to __rtnl_register can fail */
c7ac8679
GR		 6392 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL, NULL);
6393 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL, NULL);
6394 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr,
6395 inet6_dump_ifaddr, NULL);
6396 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL,
6397 inet6_dump_ifmcaddr, NULL);
6398 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL,
6399 inet6_dump_ifacaddr, NULL);
76f8f6cb 6400 __rtnl_register(PF_INET6, RTM_GETNETCONF, inet6_netconf_get_devconf,
7a674200 6401 inet6_netconf_dump_devconf, NULL);
c127ea2c 6402
2a8cc6c8
YH		 6403 ipv6_addr_label_rtnl_register();
6404
1da177e4 6405 return 0;
c127ea2c 6406errout:
b382b191 6407 rtnl_af_unregister(&inet6_ops);
c127ea2c 6408 unregister_netdevice_notifier(&ipv6_dev_notf);
e0da5a48 6409errlo:
c15b1cca
HFS		 6410 destroy_workqueue(addrconf_wq);
6411out_nowq:
e0da5a48 6412 unregister_pernet_subsys(&addrconf_ops);
2cc6d2bf
NH		 6413out_addrlabel:
6414 ipv6_addr_label_cleanup();
6415out:
c127ea2c 6416 return err;
1da177e4
LT		 6417}
6418
09f7709f 6419void addrconf_cleanup(void)
1da177e4 6420{
176c39af 6421 struct net_device *dev;
1da177e4
LT		 6422 int i;
6423
6424 unregister_netdevice_notifier(&ipv6_dev_notf);
e0da5a48 6425 unregister_pernet_subsys(&addrconf_ops);
2cc6d2bf 6426 ipv6_addr_label_cleanup();
1da177e4
LT		 6427
6428 rtnl_lock();
6429
b382b191
TG		 6430 __rtnl_af_unregister(&inet6_ops);
6431
176c39af
DL		 6432 /* clean dev list */
6433 for_each_netdev(&init_net, dev) {
6434 if (__in6_dev_get(dev) == NULL)
6435 continue;
6436 addrconf_ifdown(dev, 1);
6437 }
6438 addrconf_ifdown(init_net.loopback_dev, 2);
6439
1da177e4
LT		 6440 /*
6441 * Check hash table.
6442 */
5c578aed 6443 spin_lock_bh(&addrconf_hash_lock);
c2e21293 6444 for (i = 0; i < IN6_ADDR_HSIZE; i++)
6445 WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
5c578aed 6446 spin_unlock_bh(&addrconf_hash_lock);
c15b1cca 6447 cancel_delayed_work(&addr_chk_work);
1da177e4 6448 rtnl_unlock();
c15b1cca
HFS		 6449
6450 destroy_workqueue(addrconf_wq);
1da177e4 6451}
Linux 6.x block layer and io_uring tree(s)