]> git.proxmox.com Git - mirror_ubuntu-artful-kernel.git/blame - net/ipv6/addrconf.c
projects / mirror_ubuntu-artful-kernel.git / blame
? search:
summary | shortlog | log | commit | commitdiff | tree
blob | blame (incremental) | history | HEAD
net: vrf: Implement get_saddr for IPv6
[mirror_ubuntu-artful-kernel.git] / net / ipv6 / addrconf.c
CommitLineData
1da177e4
LT		 1/*
2 * IPv6 Address [auto]configuration
3 * Linux INET6 implementation
4 *
5 * Authors:
1ab1457c 6 * Pedro Roque <roque@di.fc.ul.pt>
1da177e4
LT		 7 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
8 *
1da177e4
LT		 9 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License
11 * as published by the Free Software Foundation; either version
12 * 2 of the License, or (at your option) any later version.
13 */
14
15/*
16 * Changes:
17 *
18 * Janos Farkas : delete timer on ifdown
19 * <chexum@bankinf.banki.hu>
20 * Andi Kleen : kill double kfree on module
21 * unload.
22 * Maciej W. Rozycki : FDDI support
23 * sekiya@USAGI : Don't send too many RS
24 * packets.
25 * yoshfuji@USAGI : Fixed interval between DAD
26 * packets.
27 * YOSHIFUJI Hideaki @USAGI : improved accuracy of
28 * address validation timer.
29 * YOSHIFUJI Hideaki @USAGI : Privacy Extensions (RFC3041)
30 * support.
31 * Yuji SEKIYA @USAGI : Don't assign a same IPv6
32 * address on a same interface.
33 * YOSHIFUJI Hideaki @USAGI : ARCnet support
34 * YOSHIFUJI Hideaki @USAGI : convert /proc/net/if_inet6 to
35 * seq_file.
b1cacb68
YH		 36 * YOSHIFUJI Hideaki @USAGI : improved source address
37 * selection; consider scope,
38 * status etc.
1da177e4
LT		 39 */
40
f3213831
JP		 41#define pr_fmt(fmt) "IPv6: " fmt
42
1da177e4
LT		 43#include <linux/errno.h>
44#include <linux/types.h>
a0bffffc 45#include <linux/kernel.h>
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
LT		 114
115#ifdef CONFIG_SYSCTL
a317a2f1 116static int addrconf_sysctl_register(struct inet6_dev *idev);
408c4768
PE		 117static void addrconf_sysctl_unregister(struct inet6_dev *idev);
118#else
a317a2f1 119static inline int addrconf_sysctl_register(struct inet6_dev *idev)
408c4768 120{
a317a2f1 121 return 0;
408c4768
PE		 122}
123
124static inline void addrconf_sysctl_unregister(struct inet6_dev *idev)
125{
126}
1da177e4
LT		 127#endif
128
eb7e0575
SD		 129static void __ipv6_regen_rndid(struct inet6_dev *idev);
130static void __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
1da177e4 131static void ipv6_regen_rndid(unsigned long data);
1da177e4 132
1b34be74 133static int ipv6_generate_eui64(u8 *eui, struct net_device *dev);
1da177e4 134static int ipv6_count_addresses(struct inet6_dev *idev);
622c81d5
HFS		 135static int ipv6_generate_stable_address(struct in6_addr *addr,
136 u8 dad_count,
137 const struct inet6_dev *idev);
1da177e4
LT		 138
139/*
140 * Configured unicast address hash table
141 */
c2e21293 142static struct hlist_head inet6_addr_lst[IN6_ADDR_HSIZE];
5c578aed 143static DEFINE_SPINLOCK(addrconf_hash_lock);
1da177e4 144
c15b1cca
HFS		 145static void addrconf_verify(void);
146static void addrconf_verify_rtnl(void);
147static void addrconf_verify_work(struct work_struct *);
1da177e4 148
c15b1cca
HFS		 149static struct workqueue_struct *addrconf_wq;
150static DECLARE_DELAYED_WORK(addr_chk_work, addrconf_verify_work);
1da177e4
LT		 151
152static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
153static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
154
93d9b7d7
JP		 155static void addrconf_type_change(struct net_device *dev,
156 unsigned long event);
1da177e4
LT		 157static int addrconf_ifdown(struct net_device *dev, int how);
158
21caa662
RK		 159static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
160 int plen,
161 const struct net_device *dev,
162 u32 flags, u32 noflags);
163
cf22f9a2 164static void addrconf_dad_start(struct inet6_ifaddr *ifp);
c15b1cca 165static void addrconf_dad_work(struct work_struct *w);
1da177e4 166static void addrconf_dad_completed(struct inet6_ifaddr *ifp);
c5e33bdd 167static void addrconf_dad_run(struct inet6_dev *idev);
1da177e4
LT		 168static void addrconf_rs_timer(unsigned long data);
169static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
170static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
171
1ab1457c 172static void inet6_prefix_notify(int event, struct inet6_dev *idev,
1da177e4 173 struct prefix_info *pinfo);
3e81c6da
DM		 174static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
175 struct net_device *dev);
1da177e4 176
888c848e 177static struct ipv6_devconf ipv6_devconf __read_mostly = {
1da177e4
LT		 178 .forwarding = 0,
179 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
180 .mtu6 = IPV6_MIN_MTU,
181 .accept_ra = 1,
182 .accept_redirects = 1,
183 .autoconf = 1,
184 .force_mld_version = 0,
fc4eba58
HFS		 185 .mldv1_unsolicited_report_interval = 10 * HZ,
186 .mldv2_unsolicited_report_interval = HZ,
1da177e4
LT		 187 .dad_transmits = 1,
188 .rtr_solicits = MAX_RTR_SOLICITATIONS,
189 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
190 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
67ba4152 191 .use_tempaddr = 0,
1da177e4
LT		 192 .temp_valid_lft = TEMP_VALID_LIFETIME,
193 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
194 .regen_max_retry = REGEN_MAX_RETRY,
195 .max_desync_factor = MAX_DESYNC_FACTOR,
1da177e4 196 .max_addresses = IPV6_MAX_ADDRESSES,
65f5c7c1 197 .accept_ra_defrtr = 1,
d9333196 198 .accept_ra_from_local = 0,
8013d1d7 199 .accept_ra_min_hop_limit= 1,
c4fd30eb 200 .accept_ra_pinfo = 1,
930d6ff2
YH		 201#ifdef CONFIG_IPV6_ROUTER_PREF
202 .accept_ra_rtr_pref = 1,
52e16356 203 .rtr_probe_interval = 60 * HZ,
09c884d4
YH		 204#ifdef CONFIG_IPV6_ROUTE_INFO
205 .accept_ra_rt_info_max_plen = 0,
206#endif
930d6ff2 207#endif
fbea49e1 208 .proxy_ndp = 0,
0bcbc926 209 .accept_source_route = 0, /* we do not accept RH0 by default. */
778d80be 210 .disable_ipv6 = 0,
1b34be74 211 .accept_dad = 1,
b800c3b9 212 .suppress_frag_ndisc = 1,
c2943f14 213 .accept_ra_mtu = 1,
3d1bec99
HFS		 214 .stable_secret = {
215 .initialized = false,
3985e8a3
EK		 216 },
217 .use_oif_addrs_only = 0,
35103d11 218 .ignore_routes_with_linkdown = 0,
f1705ec1 219 .keep_addr_on_down = 0,
1da177e4
LT		 220};
221
ab32ea5d 222static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
1da177e4
LT		 223 .forwarding = 0,
224 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
225 .mtu6 = IPV6_MIN_MTU,
226 .accept_ra = 1,
227 .accept_redirects = 1,
228 .autoconf = 1,
fc4eba58
HFS		 229 .force_mld_version = 0,
230 .mldv1_unsolicited_report_interval = 10 * HZ,
231 .mldv2_unsolicited_report_interval = HZ,
1da177e4
LT		 232 .dad_transmits = 1,
233 .rtr_solicits = MAX_RTR_SOLICITATIONS,
234 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
235 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
1da177e4
LT		 236 .use_tempaddr = 0,
237 .temp_valid_lft = TEMP_VALID_LIFETIME,
238 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
239 .regen_max_retry = REGEN_MAX_RETRY,
240 .max_desync_factor = MAX_DESYNC_FACTOR,
1da177e4 241 .max_addresses = IPV6_MAX_ADDRESSES,
65f5c7c1 242 .accept_ra_defrtr = 1,
d9333196 243 .accept_ra_from_local = 0,
8013d1d7 244 .accept_ra_min_hop_limit= 1,
c4fd30eb 245 .accept_ra_pinfo = 1,
930d6ff2
YH		 246#ifdef CONFIG_IPV6_ROUTER_PREF
247 .accept_ra_rtr_pref = 1,
52e16356 248 .rtr_probe_interval = 60 * HZ,
09c884d4
YH		 249#ifdef CONFIG_IPV6_ROUTE_INFO
250 .accept_ra_rt_info_max_plen = 0,
251#endif
930d6ff2 252#endif
fbea49e1 253 .proxy_ndp = 0,
0bcbc926 254 .accept_source_route = 0, /* we do not accept RH0 by default. */
778d80be 255 .disable_ipv6 = 0,
1b34be74 256 .accept_dad = 1,
b800c3b9 257 .suppress_frag_ndisc = 1,
c2943f14 258 .accept_ra_mtu = 1,
3d1bec99
HFS		 259 .stable_secret = {
260 .initialized = false,
261 },
3985e8a3 262 .use_oif_addrs_only = 0,
35103d11 263 .ignore_routes_with_linkdown = 0,
f1705ec1 264 .keep_addr_on_down = 0,
1da177e4
LT		 265};
266
f24e3d65 267/* Check if a valid qdisc is available */
05297949 268static inline bool addrconf_qdisc_ok(const struct net_device *dev)
f24e3d65 269{
05297949 270 return !qdisc_tx_is_noop(dev);
f24e3d65
MC		 271}
272
b7b1bfce 273static void addrconf_del_rs_timer(struct inet6_dev *idev)
1da177e4 274{
b7b1bfce
HFS		 275 if (del_timer(&idev->rs_timer))
276 __in6_dev_put(idev);
277}
278
c15b1cca 279static void addrconf_del_dad_work(struct inet6_ifaddr *ifp)
b7b1bfce 280{
c15b1cca 281 if (cancel_delayed_work(&ifp->dad_work))
1da177e4
LT		 282 __in6_ifa_put(ifp);
283}
284
b7b1bfce
HFS		 285static void addrconf_mod_rs_timer(struct inet6_dev *idev,
286 unsigned long when)
287{
288 if (!timer_pending(&idev->rs_timer))
289 in6_dev_hold(idev);
290 mod_timer(&idev->rs_timer, jiffies + when);
291}
1da177e4 292
c15b1cca
HFS		 293static void addrconf_mod_dad_work(struct inet6_ifaddr *ifp,
294 unsigned long delay)
1da177e4 295{
c15b1cca 296 if (!delayed_work_pending(&ifp->dad_work))
1da177e4 297 in6_ifa_hold(ifp);
c15b1cca 298 mod_delayed_work(addrconf_wq, &ifp->dad_work, delay);
1da177e4
LT		 299}
300
7f7d9a6b
HX		 301static int snmp6_alloc_dev(struct inet6_dev *idev)
302{
827da44c
JS		 303 int i;
304
698365fa
WC		 305 idev->stats.ipv6 = alloc_percpu(struct ipstats_mib);
306 if (!idev->stats.ipv6)
7f7d9a6b 307 goto err_ip;
827da44c
JS		 308
309 for_each_possible_cpu(i) {
310 struct ipstats_mib *addrconf_stats;
698365fa 311 addrconf_stats = per_cpu_ptr(idev->stats.ipv6, i);
827da44c 312 u64_stats_init(&addrconf_stats->syncp);
827da44c
JS		 313 }
314
315
be281e55
ED		 316 idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device),
317 GFP_KERNEL);
318 if (!idev->stats.icmpv6dev)
7f7d9a6b 319 goto err_icmp;
be281e55
ED		 320 idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device),
321 GFP_KERNEL);
322 if (!idev->stats.icmpv6msgdev)
14878f75 323 goto err_icmpmsg;
7f7d9a6b
HX		 324
325 return 0;
326
14878f75 327err_icmpmsg:
be281e55 328 kfree(idev->stats.icmpv6dev);
7f7d9a6b 329err_icmp:
698365fa 330 free_percpu(idev->stats.ipv6);
7f7d9a6b 331err_ip:
aaf70ec7 332 return -ENOMEM;
7f7d9a6b
HX		 333}
334
8e5e8f30 335static struct inet6_dev *ipv6_add_dev(struct net_device *dev)
1da177e4
LT		 336{
337 struct inet6_dev *ndev;
a317a2f1 338 int err = -ENOMEM;
1da177e4
LT		 339
340 ASSERT_RTNL();
341
342 if (dev->mtu < IPV6_MIN_MTU)
a317a2f1 343 return ERR_PTR(-EINVAL);
1da177e4 344
1ab1457c 345 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
63159f29 346 if (!ndev)
a317a2f1 347 return ERR_PTR(err);
322f74a4
IO		 348
349 rwlock_init(&ndev->lock);
350 ndev->dev = dev;
502a2ffd 351 INIT_LIST_HEAD(&ndev->addr_list);
b7b1bfce
HFS		 352 setup_timer(&ndev->rs_timer, addrconf_rs_timer,
353 (unsigned long)ndev);
c346dca1 354 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf));
9b29c696
HFS		 355
356 if (ndev->cnf.stable_secret.initialized)
357 ndev->addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
358 else
359 ndev->addr_gen_mode = IN6_ADDR_GEN_MODE_EUI64;
360
322f74a4 361 ndev->cnf.mtu6 = dev->mtu;
322f74a4 362 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
63159f29 363 if (!ndev->nd_parms) {
322f74a4 364 kfree(ndev);
a317a2f1 365 return ERR_PTR(err);
322f74a4 366 }
0187bdfb
BH		 367 if (ndev->cnf.forwarding)
368 dev_disable_lro(dev);
322f74a4
IO		 369 /* We refer to the device */
370 dev_hold(dev);
1da177e4 371
322f74a4 372 if (snmp6_alloc_dev(ndev) < 0) {
ba3542e1 373 ADBG(KERN_WARNING
f3213831 374 "%s: cannot allocate memory for statistics; dev=%s.\n",
ba3542e1 375 __func__, dev->name);
322f74a4 376 neigh_parms_release(&nd_tbl, ndev->nd_parms);
8603e33d
RL		 377 dev_put(dev);
378 kfree(ndev);
a317a2f1 379 return ERR_PTR(err);
322f74a4 380 }
1da177e4 381
322f74a4 382 if (snmp6_register_dev(ndev) < 0) {
ba3542e1 383 ADBG(KERN_WARNING
f3213831 384 "%s: cannot create /proc/net/dev_snmp6/%s\n",
ba3542e1 385 __func__, dev->name);
a317a2f1 386 goto err_release;
322f74a4
IO		 387 }
388
389 /* One reference from device. We must do this before
390 * we invoke __ipv6_regen_rndid().
391 */
392 in6_dev_hold(ndev);
1da177e4 393
1b34be74
YH		 394 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
395 ndev->cnf.accept_dad = -1;
396
07a93626 397#if IS_ENABLED(CONFIG_IPV6_SIT)
b077d7ab 398 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
f3213831 399 pr_info("%s: Disabled Multicast RS\n", dev->name);
b077d7ab
YH		 400 ndev->cnf.rtr_solicits = 0;
401 }
402#endif
403
372e6c8f 404 INIT_LIST_HEAD(&ndev->tempaddr_list);
b24b8a24 405 setup_timer(&ndev->regen_timer, ipv6_regen_rndid, (unsigned long)ndev);
322f74a4
IO		 406 if ((dev->flags&IFF_LOOPBACK) ||
407 dev->type == ARPHRD_TUNNEL ||
9625ed72 408 dev->type == ARPHRD_TUNNEL6 ||
0be669bb 409 dev->type == ARPHRD_SIT ||
0be669bb 410 dev->type == ARPHRD_NONE) {
322f74a4
IO		 411 ndev->cnf.use_tempaddr = -1;
412 } else {
413 in6_dev_hold(ndev);
414 ipv6_regen_rndid((unsigned long) ndev);
415 }
5d9efa7e 416
914faa14 417 ndev->token = in6addr_any;
1da177e4 418
f24e3d65 419 if (netif_running(dev) && addrconf_qdisc_ok(dev))
53aadcc9
HX		 420 ndev->if_flags |= IF_READY;
421
322f74a4
IO		 422 ipv6_mc_init_dev(ndev);
423 ndev->tstamp = jiffies;
a317a2f1
WC		 424 err = addrconf_sysctl_register(ndev);
425 if (err) {
426 ipv6_mc_destroy_dev(ndev);
427 del_timer(&ndev->regen_timer);
2a189f9e 428 snmp6_unregister_dev(ndev);
a317a2f1
WC		 429 goto err_release;
430 }
30c4cf57 431 /* protected by rtnl_lock */
cf778b00 432 rcu_assign_pointer(dev->ip6_ptr, ndev);
d88ae4cc 433
2c5e8933
HFS		 434 /* Join interface-local all-node multicast group */
435 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allnodes);
436
d88ae4cc 437 /* Join all-node multicast group */
f3ee4010 438 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);
d88ae4cc 439
d6ddef9e 440 /* Join all-router multicast group if forwarding is set */
8b2aaede 441 if (ndev->cnf.forwarding && (dev->flags & IFF_MULTICAST))
d6ddef9e
LW		 442 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
443
1da177e4 444 return ndev;
a317a2f1
WC		 445
446err_release:
447 neigh_parms_release(&nd_tbl, ndev->nd_parms);
448 ndev->dead = 1;
449 in6_dev_finish_destroy(ndev);
450 return ERR_PTR(err);
1da177e4
LT		 451}
452
8e5e8f30 453static struct inet6_dev *ipv6_find_idev(struct net_device *dev)
1da177e4
LT		 454{
455 struct inet6_dev *idev;
456
457 ASSERT_RTNL();
458
e21e8467
SH		 459 idev = __in6_dev_get(dev);
460 if (!idev) {
461 idev = ipv6_add_dev(dev);
a317a2f1 462 if (IS_ERR(idev))
1da177e4
LT		 463 return NULL;
464 }
c5e33bdd 465
1da177e4
LT		 466 if (dev->flags&IFF_UP)
467 ipv6_mc_up(idev);
468 return idev;
469}
470
f3a1bfb1
ND		 471static int inet6_netconf_msgsize_devconf(int type)
472{
473 int size = NLMSG_ALIGN(sizeof(struct netconfmsg))
474 + nla_total_size(4); /* NETCONFA_IFINDEX */
136ba622 475 bool all = false;
f3a1bfb1 476
136ba622
ZS		 477 if (type == NETCONFA_ALL)
478 all = true;
479
480 if (all || type == NETCONFA_FORWARDING)
f3a1bfb1 481 size += nla_total_size(4);
b1afce95 482#ifdef CONFIG_IPV6_MROUTE
136ba622 483 if (all || type == NETCONFA_MC_FORWARDING)
d67b8c61 484 size += nla_total_size(4);
b1afce95 485#endif
136ba622 486 if (all || type == NETCONFA_PROXY_NEIGH)
c92d5491 487 size += nla_total_size(4);
f3a1bfb1 488
136ba622 489 if (all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN)
35103d11
AG		 490 size += nla_total_size(4);
491
f3a1bfb1
ND		 492 return size;
493}
494
495static int inet6_netconf_fill_devconf(struct sk_buff *skb, int ifindex,
496 struct ipv6_devconf *devconf, u32 portid,
497 u32 seq, int event, unsigned int flags,
498 int type)
499{
500 struct nlmsghdr *nlh;
501 struct netconfmsg *ncm;
136ba622 502 bool all = false;
f3a1bfb1
ND		 503
504 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg),
505 flags);
63159f29 506 if (!nlh)
f3a1bfb1
ND		 507 return -EMSGSIZE;
508
136ba622
ZS		 509 if (type == NETCONFA_ALL)
510 all = true;
511
f3a1bfb1
ND		 512 ncm = nlmsg_data(nlh);
513 ncm->ncm_family = AF_INET6;
514
515 if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0)
516 goto nla_put_failure;
517
136ba622 518 if ((all || type == NETCONFA_FORWARDING) &&
f3a1bfb1
ND		 519 nla_put_s32(skb, NETCONFA_FORWARDING, devconf->forwarding) < 0)
520 goto nla_put_failure;
b1afce95 521#ifdef CONFIG_IPV6_MROUTE
136ba622 522 if ((all || type == NETCONFA_MC_FORWARDING) &&
d67b8c61
ND		 523 nla_put_s32(skb, NETCONFA_MC_FORWARDING,
524 devconf->mc_forwarding) < 0)
525 goto nla_put_failure;
b1afce95 526#endif
136ba622 527 if ((all || type == NETCONFA_PROXY_NEIGH) &&
c92d5491 528 nla_put_s32(skb, NETCONFA_PROXY_NEIGH, devconf->proxy_ndp) < 0)
529 goto nla_put_failure;
530
136ba622 531 if ((all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN) &&
35103d11
AG		 532 nla_put_s32(skb, NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
533 devconf->ignore_routes_with_linkdown) < 0)
534 goto nla_put_failure;
535
053c095a
JB		 536 nlmsg_end(skb, nlh);
537 return 0;
f3a1bfb1
ND		 538
539nla_put_failure:
540 nlmsg_cancel(skb, nlh);
541 return -EMSGSIZE;
542}
543
d67b8c61
ND		 544void inet6_netconf_notify_devconf(struct net *net, int type, int ifindex,
545 struct ipv6_devconf *devconf)
f3a1bfb1
ND		 546{
547 struct sk_buff *skb;
548 int err = -ENOBUFS;
549
550 skb = nlmsg_new(inet6_netconf_msgsize_devconf(type), GFP_ATOMIC);
63159f29 551 if (!skb)
f3a1bfb1
ND		 552 goto errout;
553
554 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 0, 0,
555 RTM_NEWNETCONF, 0, type);
556 if (err < 0) {
557 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
558 WARN_ON(err == -EMSGSIZE);
559 kfree_skb(skb);
560 goto errout;
561 }
562 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_NETCONF, NULL, GFP_ATOMIC);
563 return;
564errout:
bd779028 565 rtnl_set_sk_err(net, RTNLGRP_IPV6_NETCONF, err);
f3a1bfb1
ND		 566}
567
76f8f6cb
ND		 568static const struct nla_policy devconf_ipv6_policy[NETCONFA_MAX+1] = {
569 [NETCONFA_IFINDEX] = { .len = sizeof(int) },
570 [NETCONFA_FORWARDING] = { .len = sizeof(int) },
c92d5491 571 [NETCONFA_PROXY_NEIGH] = { .len = sizeof(int) },
35103d11 572 [NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN] = { .len = sizeof(int) },
76f8f6cb
ND		 573};
574
575static int inet6_netconf_get_devconf(struct sk_buff *in_skb,
661d2967 576 struct nlmsghdr *nlh)
76f8f6cb
ND		 577{
578 struct net *net = sock_net(in_skb->sk);
579 struct nlattr *tb[NETCONFA_MAX+1];
580 struct netconfmsg *ncm;
581 struct sk_buff *skb;
582 struct ipv6_devconf *devconf;
583 struct inet6_dev *in6_dev;
584 struct net_device *dev;
585 int ifindex;
586 int err;
587
588 err = nlmsg_parse(nlh, sizeof(*ncm), tb, NETCONFA_MAX,
589 devconf_ipv6_policy);
590 if (err < 0)
591 goto errout;
592
a97eb33f 593 err = -EINVAL;
76f8f6cb
ND		 594 if (!tb[NETCONFA_IFINDEX])
595 goto errout;
596
597 ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]);
598 switch (ifindex) {
599 case NETCONFA_IFINDEX_ALL:
600 devconf = net->ipv6.devconf_all;
601 break;
602 case NETCONFA_IFINDEX_DEFAULT:
603 devconf = net->ipv6.devconf_dflt;
604 break;
605 default:
606 dev = __dev_get_by_index(net, ifindex);
63159f29 607 if (!dev)
76f8f6cb
ND		 608 goto errout;
609 in6_dev = __in6_dev_get(dev);
63159f29 610 if (!in6_dev)
76f8f6cb
ND		 611 goto errout;
612 devconf = &in6_dev->cnf;
613 break;
614 }
615
616 err = -ENOBUFS;
136ba622 617 skb = nlmsg_new(inet6_netconf_msgsize_devconf(NETCONFA_ALL), GFP_ATOMIC);
63159f29 618 if (!skb)
76f8f6cb
ND		 619 goto errout;
620
621 err = inet6_netconf_fill_devconf(skb, ifindex, devconf,
622 NETLINK_CB(in_skb).portid,
623 nlh->nlmsg_seq, RTM_NEWNETCONF, 0,
136ba622 624 NETCONFA_ALL);
76f8f6cb
ND		 625 if (err < 0) {
626 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
627 WARN_ON(err == -EMSGSIZE);
628 kfree_skb(skb);
629 goto errout;
630 }
631 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
632errout:
633 return err;
634}
635
7a674200
ND		 636static int inet6_netconf_dump_devconf(struct sk_buff *skb,
637 struct netlink_callback *cb)
638{
639 struct net *net = sock_net(skb->sk);
640 int h, s_h;
641 int idx, s_idx;
642 struct net_device *dev;
643 struct inet6_dev *idev;
644 struct hlist_head *head;
645
646 s_h = cb->args[0];
647 s_idx = idx = cb->args[1];
648
649 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
650 idx = 0;
651 head = &net->dev_index_head[h];
652 rcu_read_lock();
63998ac2
ND		 653 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^
654 net->dev_base_seq;
7a674200
ND		 655 hlist_for_each_entry_rcu(dev, head, index_hlist) {
656 if (idx < s_idx)
657 goto cont;
658 idev = __in6_dev_get(dev);
659 if (!idev)
660 goto cont;
661
662 if (inet6_netconf_fill_devconf(skb, dev->ifindex,
663 &idev->cnf,
664 NETLINK_CB(cb->skb).portid,
665 cb->nlh->nlmsg_seq,
666 RTM_NEWNETCONF,
667 NLM_F_MULTI,
136ba622 668 NETCONFA_ALL) < 0) {
7a674200
ND		 669 rcu_read_unlock();
670 goto done;
671 }
63998ac2 672 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
7a674200
ND		 673cont:
674 idx++;
675 }
676 rcu_read_unlock();
677 }
678 if (h == NETDEV_HASHENTRIES) {
679 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL,
680 net->ipv6.devconf_all,
681 NETLINK_CB(cb->skb).portid,
682 cb->nlh->nlmsg_seq,
683 RTM_NEWNETCONF, NLM_F_MULTI,
136ba622 684 NETCONFA_ALL) < 0)
7a674200
ND		 685 goto done;
686 else
687 h++;
688 }
689 if (h == NETDEV_HASHENTRIES + 1) {
690 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT,
691 net->ipv6.devconf_dflt,
692 NETLINK_CB(cb->skb).portid,
693 cb->nlh->nlmsg_seq,
694 RTM_NEWNETCONF, NLM_F_MULTI,
136ba622 695 NETCONFA_ALL) < 0)
7a674200
ND		 696 goto done;
697 else
698 h++;
699 }
700done:
701 cb->args[0] = h;
702 cb->args[1] = idx;
703
704 return skb->len;
705}
706
1da177e4
LT		 707#ifdef CONFIG_SYSCTL
708static void dev_forward_change(struct inet6_dev *idev)
709{
710 struct net_device *dev;
711 struct inet6_ifaddr *ifa;
1da177e4
LT		 712
713 if (!idev)
714 return;
715 dev = idev->dev;
0187bdfb
BH		 716 if (idev->cnf.forwarding)
717 dev_disable_lro(dev);
1a940835 718 if (dev->flags & IFF_MULTICAST) {
2c5e8933 719 if (idev->cnf.forwarding) {
f3ee4010 720 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
2c5e8933
HFS		 721 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allrouters);
722 ipv6_dev_mc_inc(dev, &in6addr_sitelocal_allrouters);
723 } else {
f3ee4010 724 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
2c5e8933
HFS		 725 ipv6_dev_mc_dec(dev, &in6addr_interfacelocal_allrouters);
726 ipv6_dev_mc_dec(dev, &in6addr_sitelocal_allrouters);
727 }
1da177e4 728 }
502a2ffd 729
730 list_for_each_entry(ifa, &idev->addr_list, if_list) {
2c12a74c
MW		 731 if (ifa->flags&IFA_F_TENTATIVE)
732 continue;
1da177e4
LT		 733 if (idev->cnf.forwarding)
734 addrconf_join_anycast(ifa);
735 else
736 addrconf_leave_anycast(ifa);
737 }
f3a1bfb1
ND		 738 inet6_netconf_notify_devconf(dev_net(dev), NETCONFA_FORWARDING,
739 dev->ifindex, &idev->cnf);
1da177e4
LT		 740}
741
742
e186932b 743static void addrconf_forward_change(struct net *net, __s32 newf)
1da177e4
LT		 744{
745 struct net_device *dev;
746 struct inet6_dev *idev;
747
4acd4945 748 for_each_netdev(net, dev) {
1da177e4
LT		 749 idev = __in6_dev_get(dev);
750 if (idev) {
e186932b
PE		 751 int changed = (!idev->cnf.forwarding) ^ (!newf);
752 idev->cnf.forwarding = newf;
1da177e4
LT		 753 if (changed)
754 dev_forward_change(idev);
755 }
1da177e4 756 }
1da177e4 757}
c8fecf22 758
013d97e9 759static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf)
c8fecf22 760{
bff16c2f 761 struct net *net;
013d97e9
FR		 762 int old;
763
764 if (!rtnl_trylock())
765 return restart_syscall();
bff16c2f
PE		 766
767 net = (struct net *)table->extra2;
013d97e9
FR		 768 old = *p;
769 *p = newf;
b325fddb 770
013d97e9 771 if (p == &net->ipv6.devconf_dflt->forwarding) {
f3a1bfb1
ND		 772 if ((!newf) ^ (!old))
773 inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING,
774 NETCONFA_IFINDEX_DEFAULT,
775 net->ipv6.devconf_dflt);
013d97e9
FR		 776 rtnl_unlock();
777 return 0;
88af182e 778 }
c8fecf22 779
e186932b 780 if (p == &net->ipv6.devconf_all->forwarding) {
e186932b
PE		 781 net->ipv6.devconf_dflt->forwarding = newf;
782 addrconf_forward_change(net, newf);
f3a1bfb1
ND		 783 if ((!newf) ^ (!old))
784 inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING,
785 NETCONFA_IFINDEX_ALL,
786 net->ipv6.devconf_all);
013d97e9 787 } else if ((!newf) ^ (!old))
c8fecf22 788 dev_forward_change((struct inet6_dev *)table->extra1);
0187bdfb 789 rtnl_unlock();
c8fecf22 790
013d97e9 791 if (newf)
7b4da532 792 rt6_purge_dflt_routers(net);
b325fddb 793 return 1;
c8fecf22 794}
35103d11
AG		 795
796static void addrconf_linkdown_change(struct net *net, __s32 newf)
797{
798 struct net_device *dev;
799 struct inet6_dev *idev;
800
801 for_each_netdev(net, dev) {
802 idev = __in6_dev_get(dev);
803 if (idev) {
804 int changed = (!idev->cnf.ignore_routes_with_linkdown) ^ (!newf);
805
806 idev->cnf.ignore_routes_with_linkdown = newf;
807 if (changed)
808 inet6_netconf_notify_devconf(dev_net(dev),
809 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
810 dev->ifindex,
811 &idev->cnf);
812 }
813 }
814}
815
816static int addrconf_fixup_linkdown(struct ctl_table *table, int *p, int newf)
817{
818 struct net *net;
819 int old;
820
821 if (!rtnl_trylock())
822 return restart_syscall();
823
824 net = (struct net *)table->extra2;
825 old = *p;
826 *p = newf;
827
828 if (p == &net->ipv6.devconf_dflt->ignore_routes_with_linkdown) {
829 if ((!newf) ^ (!old))
830 inet6_netconf_notify_devconf(net,
831 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
832 NETCONFA_IFINDEX_DEFAULT,
833 net->ipv6.devconf_dflt);
834 rtnl_unlock();
835 return 0;
836 }
837
838 if (p == &net->ipv6.devconf_all->ignore_routes_with_linkdown) {
839 net->ipv6.devconf_dflt->ignore_routes_with_linkdown = newf;
840 addrconf_linkdown_change(net, newf);
841 if ((!newf) ^ (!old))
842 inet6_netconf_notify_devconf(net,
843 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
844 NETCONFA_IFINDEX_ALL,
845 net->ipv6.devconf_all);
846 }
847 rtnl_unlock();
848
849 return 1;
850}
851
1da177e4
LT		 852#endif
853
5c578aed 854/* Nobody refers to this ifaddr, destroy it */
1da177e4
LT		 855void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
856{
c2e21293 857 WARN_ON(!hlist_unhashed(&ifp->addr_lst));
547b792c 858
1da177e4 859#ifdef NET_REFCNT_DEBUG
91df42be 860 pr_debug("%s\n", __func__);
1da177e4
LT		 861#endif
862
863 in6_dev_put(ifp->idev);
864
c15b1cca
HFS		 865 if (cancel_delayed_work(&ifp->dad_work))
866 pr_notice("delayed DAD work was pending while freeing ifa=%p\n",
867 ifp);
1da177e4 868
e9d3e084 869 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
f3213831 870 pr_warn("Freeing alive inet6 address %p\n", ifp);
1da177e4
LT		 871 return;
872 }
94e187c0 873 ip6_rt_put(ifp->rt);
1da177e4 874
e5785985 875 kfree_rcu(ifp, rcu);
1da177e4
LT		 876}
877
e55ffac6
BH		 878static void
879ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
880{
502a2ffd 881 struct list_head *p;
8a6ce0c0 882 int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
e55ffac6
BH		 883
884 /*
885 * Each device address list is sorted in order of scope -
886 * global before linklocal.
887 */
502a2ffd 888 list_for_each(p, &idev->addr_list) {
889 struct inet6_ifaddr *ifa
890 = list_entry(p, struct inet6_ifaddr, if_list);
8a6ce0c0 891 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
e55ffac6
BH		 892 break;
893 }
894
b54c9b98 895 list_add_tail(&ifp->if_list, p);
e55ffac6
BH		 896}
897
ddbe5032 898static u32 inet6_addr_hash(const struct in6_addr *addr)
3eb84f49 899{
ddbe5032 900 return hash_32(ipv6_addr_hash(addr), IN6_ADDR_HSIZE_SHIFT);
3eb84f49
YH		 901}
902
1da177e4
LT		 903/* On success it returns ifp with increased reference count */
904
905static struct inet6_ifaddr *
3f8f5298
JP		 906ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
907 const struct in6_addr *peer_addr, int pfxlen,
8a226b2c 908 int scope, u32 flags, u32 valid_lft, u32 prefered_lft)
1da177e4
LT		 909{
910 struct inet6_ifaddr *ifa = NULL;
911 struct rt6_info *rt;
3a88a81d 912 unsigned int hash;
1da177e4 913 int err = 0;
d68b8270
YH		 914 int addr_type = ipv6_addr_type(addr);
915
916 if (addr_type == IPV6_ADDR_ANY ||
917 addr_type & IPV6_ADDR_MULTICAST ||
918 (!(idev->dev->flags & IFF_LOOPBACK) &&
919 addr_type & IPV6_ADDR_LOOPBACK))
920 return ERR_PTR(-EADDRNOTAVAIL);
1da177e4 921
8814c4b5 922 rcu_read_lock_bh();
1da177e4
LT		 923 if (idev->dead) {
924 err = -ENODEV; /*XXX*/
925 goto out2;
926 }
927
56d417b1 928 if (idev->cnf.disable_ipv6) {
9bdd8d40
BH		 929 err = -EACCES;
930 goto out2;
931 }
932
5c578aed 933 spin_lock(&addrconf_hash_lock);
1da177e4
LT		 934
935 /* Ignore adding duplicate addresses on an interface */
c346dca1 936 if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) {
ba3542e1 937 ADBG("ipv6_add_addr: already assigned\n");
1da177e4
LT		 938 err = -EEXIST;
939 goto out;
940 }
941
322f74a4 942 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
1da177e4 943
63159f29 944 if (!ifa) {
ba3542e1 945 ADBG("ipv6_add_addr: malloc failed\n");
1da177e4
LT		 946 err = -ENOBUFS;
947 goto out;
948 }
949
8f031519 950 rt = addrconf_dst_alloc(idev, addr, false);
1da177e4
LT		 951 if (IS_ERR(rt)) {
952 err = PTR_ERR(rt);
953 goto out;
954 }
955
bba24896
JP		 956 neigh_parms_data_state_setall(idev->nd_parms);
957
4e3fd7a0 958 ifa->addr = *addr;
3f8f5298
JP		 959 if (peer_addr)
960 ifa->peer_addr = *peer_addr;
1da177e4
LT		 961
962 spin_lock_init(&ifa->lock);
c15b1cca 963 INIT_DELAYED_WORK(&ifa->dad_work, addrconf_dad_work);
c2e21293 964 INIT_HLIST_NODE(&ifa->addr_lst);
1da177e4
LT		 965 ifa->scope = scope;
966 ifa->prefix_len = pfxlen;
967 ifa->flags = flags | IFA_F_TENTATIVE;
8a226b2c
JB		 968 ifa->valid_lft = valid_lft;
969 ifa->prefered_lft = prefered_lft;
1da177e4 970 ifa->cstamp = ifa->tstamp = jiffies;
617fe29d 971 ifa->tokenized = false;
1da177e4 972
57f5f544
KF		 973 ifa->rt = rt;
974
1da177e4
LT		 975 ifa->idev = idev;
976 in6_dev_hold(idev);
977 /* For caller */
978 in6_ifa_hold(ifa);
979
980 /* Add to big hash table */
ddbe5032 981 hash = inet6_addr_hash(addr);
1da177e4 982
5c578aed 983 hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]);
5c578aed 984 spin_unlock(&addrconf_hash_lock);
1da177e4
LT		 985
986 write_lock(&idev->lock);
987 /* Add to inet6_dev unicast addr list. */
e55ffac6 988 ipv6_link_dev_addr(idev, ifa);
1da177e4 989
1da177e4 990 if (ifa->flags&IFA_F_TEMPORARY) {
372e6c8f 991 list_add(&ifa->tmp_list, &idev->tempaddr_list);
1da177e4
LT		 992 in6_ifa_hold(ifa);
993 }
1da177e4 994
1da177e4
LT		 995 in6_ifa_hold(ifa);
996 write_unlock(&idev->lock);
997out2:
8814c4b5 998 rcu_read_unlock_bh();
1da177e4 999
fd92833a 1000 if (likely(err == 0))
f88c91dd 1001 inet6addr_notifier_call_chain(NETDEV_UP, ifa);
1da177e4
LT		 1002 else {
1003 kfree(ifa);
1004 ifa = ERR_PTR(err);
1005 }
1006
1007 return ifa;
1008out:
5c578aed 1009 spin_unlock(&addrconf_hash_lock);
1da177e4
LT		 1010 goto out2;
1011}
1012
5b84efec
TH		 1013enum cleanup_prefix_rt_t {
1014 CLEANUP_PREFIX_RT_NOP, /* no cleanup action for prefix route */
1015 CLEANUP_PREFIX_RT_DEL, /* delete the prefix route */
1016 CLEANUP_PREFIX_RT_EXPIRE, /* update the lifetime of the prefix route */
1017};
1018
1019/*
1020 * Check, whether the prefix for ifp would still need a prefix route
1021 * after deleting ifp. The function returns one of the CLEANUP_PREFIX_RT_*
1022 * constants.
1023 *
1024 * 1) we don't purge prefix if address was not permanent.
1025 * prefix is managed by its own lifetime.
1026 * 2) we also don't purge, if the address was IFA_F_NOPREFIXROUTE.
1027 * 3) if there are no addresses, delete prefix.
1028 * 4) if there are still other permanent address(es),
1029 * corresponding prefix is still permanent.
1030 * 5) if there are still other addresses with IFA_F_NOPREFIXROUTE,
1031 * don't purge the prefix, assume user space is managing it.
1032 * 6) otherwise, update prefix lifetime to the
1033 * longest valid lifetime among the corresponding
1034 * addresses on the device.
1035 * Note: subsequent RA will update lifetime.
1036 **/
1037static enum cleanup_prefix_rt_t
1038check_cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long *expires)
1039{
1040 struct inet6_ifaddr *ifa;
1041 struct inet6_dev *idev = ifp->idev;
1042 unsigned long lifetime;
1043 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_DEL;
1044
1045 *expires = jiffies;
1046
1047 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1048 if (ifa == ifp)
1049 continue;
1050 if (!ipv6_prefix_equal(&ifa->addr, &ifp->addr,
1051 ifp->prefix_len))
1052 continue;
1053 if (ifa->flags & (IFA_F_PERMANENT | IFA_F_NOPREFIXROUTE))
1054 return CLEANUP_PREFIX_RT_NOP;
1055
1056 action = CLEANUP_PREFIX_RT_EXPIRE;
1057
1058 spin_lock(&ifa->lock);
1059
1060 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
1061 /*
1062 * Note: Because this address is
1063 * not permanent, lifetime <
1064 * LONG_MAX / HZ here.
1065 */
1066 if (time_before(*expires, ifa->tstamp + lifetime * HZ))
1067 *expires = ifa->tstamp + lifetime * HZ;
1068 spin_unlock(&ifa->lock);
1069 }
1070
1071 return action;
1072}
1073
1074static void
1075cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long expires, bool del_rt)
1076{
1077 struct rt6_info *rt;
1078
1079 rt = addrconf_get_prefix_route(&ifp->addr,
1080 ifp->prefix_len,
1081 ifp->idev->dev,
1082 0, RTF_GATEWAY | RTF_DEFAULT);
1083 if (rt) {
1084 if (del_rt)
1085 ip6_del_rt(rt);
1086 else {
1087 if (!(rt->rt6i_flags & RTF_EXPIRES))
1088 rt6_set_expires(rt, expires);
1089 ip6_rt_put(rt);
1090 }
1091 }
1092}
1093
1094
1da177e4
LT		 1095/* This function wants to get referenced ifp and releases it before return */
1096
1097static void ipv6_del_addr(struct inet6_ifaddr *ifp)
1098{
4c5ff6a6 1099 int state;
5b84efec
TH		 1100 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_NOP;
1101 unsigned long expires;
1da177e4 1102
c15b1cca
HFS		 1103 ASSERT_RTNL();
1104
8e8e676d 1105 spin_lock_bh(&ifp->lock);
4c5ff6a6 1106 state = ifp->state;
e9d3e084 1107 ifp->state = INET6_IFADDR_STATE_DEAD;
8e8e676d 1108 spin_unlock_bh(&ifp->lock);
4c5ff6a6
HX		 1109
1110 if (state == INET6_IFADDR_STATE_DEAD)
1111 goto out;
1da177e4 1112
5c578aed 1113 spin_lock_bh(&addrconf_hash_lock);
1114 hlist_del_init_rcu(&ifp->addr_lst);
5c578aed 1115 spin_unlock_bh(&addrconf_hash_lock);
1da177e4 1116
5b84efec 1117 write_lock_bh(&ifp->idev->lock);
5d9efa7e 1118
1da177e4 1119 if (ifp->flags&IFA_F_TEMPORARY) {
372e6c8f 1120 list_del(&ifp->tmp_list);
1121 if (ifp->ifpub) {
1122 in6_ifa_put(ifp->ifpub);
1123 ifp->ifpub = NULL;
1da177e4 1124 }
372e6c8f 1125 __in6_ifa_put(ifp);
1da177e4 1126 }
1da177e4 1127
5b84efec
TH		 1128 if (ifp->flags & IFA_F_PERMANENT && !(ifp->flags & IFA_F_NOPREFIXROUTE))
1129 action = check_cleanup_prefix_route(ifp, &expires);
502a2ffd 1130
5b84efec
TH		 1131 list_del_init(&ifp->if_list);
1132 __in6_ifa_put(ifp);
1133
1134 write_unlock_bh(&ifp->idev->lock);
1da177e4 1135
c15b1cca 1136 addrconf_del_dad_work(ifp);
b2238566 1137
1da177e4
LT		 1138 ipv6_ifa_notify(RTM_DELADDR, ifp);
1139
f88c91dd 1140 inet6addr_notifier_call_chain(NETDEV_DOWN, ifp);
1da177e4 1141
5b84efec
TH		 1142 if (action != CLEANUP_PREFIX_RT_NOP) {
1143 cleanup_prefix_route(ifp, expires,
1144 action == CLEANUP_PREFIX_RT_DEL);
1da177e4
LT		 1145 }
1146
c3968a85
DW		 1147 /* clean up prefsrc entries */
1148 rt6_remove_prefsrc(ifp);
4c5ff6a6 1149out:
1da177e4
LT		 1150 in6_ifa_put(ifp);
1151}
1152
1da177e4
LT		 1153static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
1154{
1155 struct inet6_dev *idev = ifp->idev;
1156 struct in6_addr addr, *tmpaddr;
76f793e3 1157 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_tstamp, age;
eac55bf9 1158 unsigned long regen_advance;
1da177e4
LT		 1159 int tmp_plen;
1160 int ret = 0;
95c385b4 1161 u32 addr_flags;
76f793e3 1162 unsigned long now = jiffies;
1da177e4 1163
53bd6749 1164 write_lock_bh(&idev->lock);
1da177e4
LT		 1165 if (ift) {
1166 spin_lock_bh(&ift->lock);
1167 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
1168 spin_unlock_bh(&ift->lock);
1169 tmpaddr = &addr;
1170 } else {
1171 tmpaddr = NULL;
1172 }
1173retry:
1174 in6_dev_hold(idev);
1175 if (idev->cnf.use_tempaddr <= 0) {
53bd6749 1176 write_unlock_bh(&idev->lock);
f3213831 1177 pr_info("%s: use_tempaddr is disabled\n", __func__);
1da177e4
LT		 1178 in6_dev_put(idev);
1179 ret = -1;
1180 goto out;
1181 }
1182 spin_lock_bh(&ifp->lock);
1183 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
1184 idev->cnf.use_tempaddr = -1; /*XXX*/
1185 spin_unlock_bh(&ifp->lock);
53bd6749 1186 write_unlock_bh(&idev->lock);
f3213831
JP		 1187 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n",
1188 __func__);
1da177e4
LT		 1189 in6_dev_put(idev);
1190 ret = -1;
1191 goto out;
1192 }
1193 in6_ifa_hold(ifp);
1194 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
eb7e0575 1195 __ipv6_try_regen_rndid(idev, tmpaddr);
1da177e4 1196 memcpy(&addr.s6_addr[8], idev->rndid, 8);
76f793e3 1197 age = (now - ifp->tstamp) / HZ;
1da177e4
LT		 1198 tmp_valid_lft = min_t(__u32,
1199 ifp->valid_lft,
7a876b0e 1200 idev->cnf.temp_valid_lft + age);
1ab1457c
YH		 1201 tmp_prefered_lft = min_t(__u32,
1202 ifp->prefered_lft,
7a876b0e 1203 idev->cnf.temp_prefered_lft + age -
784e2710 1204 idev->cnf.max_desync_factor);
1da177e4 1205 tmp_plen = ifp->prefix_len;
1da177e4
LT		 1206 tmp_tstamp = ifp->tstamp;
1207 spin_unlock_bh(&ifp->lock);
1208
eac55bf9 1209 regen_advance = idev->cnf.regen_max_retry *
67ba4152
IM		 1210 idev->cnf.dad_transmits *
1211 NEIGH_VAR(idev->nd_parms, RETRANS_TIME) / HZ;
53bd6749 1212 write_unlock_bh(&idev->lock);
95c385b4 1213
eac55bf9
BB		 1214 /* A temporary address is created only if this calculated Preferred
1215 * Lifetime is greater than REGEN_ADVANCE time units. In particular,
1216 * an implementation must not create a temporary address with a zero
1217 * Preferred Lifetime.
ecab6701
HK		 1218 * Use age calculation as in addrconf_verify to avoid unnecessary
1219 * temporary addresses being generated.
eac55bf9 1220 */
ecab6701
HK		 1221 age = (now - tmp_tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
1222 if (tmp_prefered_lft <= regen_advance + age) {
eac55bf9
BB		 1223 in6_ifa_put(ifp);
1224 in6_dev_put(idev);
1225 ret = -1;
1226 goto out;
1227 }
1228
95c385b4
NH		 1229 addr_flags = IFA_F_TEMPORARY;
1230 /* set in addrconf_prefix_rcv() */
1231 if (ifp->flags & IFA_F_OPTIMISTIC)
1232 addr_flags |= IFA_F_OPTIMISTIC;
1233
4b08a8f1
HFS		 1234 ift = ipv6_add_addr(idev, &addr, NULL, tmp_plen,
1235 ipv6_addr_scope(&addr), addr_flags,
1236 tmp_valid_lft, tmp_prefered_lft);
1237 if (IS_ERR(ift)) {
1da177e4
LT		 1238 in6_ifa_put(ifp);
1239 in6_dev_put(idev);
f3213831 1240 pr_info("%s: retry temporary address regeneration\n", __func__);
1da177e4 1241 tmpaddr = &addr;
53bd6749 1242 write_lock_bh(&idev->lock);
1da177e4
LT		 1243 goto retry;
1244 }
1245
1246 spin_lock_bh(&ift->lock);
1247 ift->ifpub = ifp;
76f793e3 1248 ift->cstamp = now;
1da177e4
LT		 1249 ift->tstamp = tmp_tstamp;
1250 spin_unlock_bh(&ift->lock);
1251
cf22f9a2 1252 addrconf_dad_start(ift);
1da177e4
LT		 1253 in6_ifa_put(ift);
1254 in6_dev_put(idev);
1255out:
1256 return ret;
1257}
1da177e4
LT		 1258
1259/*
072047e4 1260 * Choose an appropriate source address (RFC3484)
1da177e4 1261 */
a9b05723
YH		 1262enum {
1263 IPV6_SADDR_RULE_INIT = 0,
1264 IPV6_SADDR_RULE_LOCAL,
1265 IPV6_SADDR_RULE_SCOPE,
1266 IPV6_SADDR_RULE_PREFERRED,
1267#ifdef CONFIG_IPV6_MIP6
1268 IPV6_SADDR_RULE_HOA,
1269#endif
1270 IPV6_SADDR_RULE_OIF,
1271 IPV6_SADDR_RULE_LABEL,
a9b05723 1272 IPV6_SADDR_RULE_PRIVACY,
a9b05723
YH		 1273 IPV6_SADDR_RULE_ORCHID,
1274 IPV6_SADDR_RULE_PREFIX,
7fd2561e
EK		 1275#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1276 IPV6_SADDR_RULE_NOT_OPTIMISTIC,
1277#endif
a9b05723
YH		 1278 IPV6_SADDR_RULE_MAX
1279};
1280
072047e4 1281struct ipv6_saddr_score {
a9b05723
YH		 1282 int rule;
1283 int addr_type;
1284 struct inet6_ifaddr *ifa;
1285 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
1286 int scopedist;
1287 int matchlen;
072047e4
YH		 1288};
1289
a9b05723 1290struct ipv6_saddr_dst {
9acd9f3a 1291 const struct in6_addr *addr;
a9b05723
YH		 1292 int ifindex;
1293 int scope;
1294 int label;
7cbca67c 1295 unsigned int prefs;
a9b05723 1296};
072047e4 1297
b6f99a21 1298static inline int ipv6_saddr_preferred(int type)
1da177e4 1299{
45bb0060 1300 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
072047e4
YH		 1301 return 1;
1302 return 0;
1da177e4
LT		 1303}
1304
7fd2561e
EK		 1305static inline bool ipv6_use_optimistic_addr(struct inet6_dev *idev)
1306{
1307#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1308 return idev && idev->cnf.optimistic_dad && idev->cnf.use_optimistic;
1309#else
1310 return false;
1311#endif
1312}
1313
3de23255
BT		 1314static int ipv6_get_saddr_eval(struct net *net,
1315 struct ipv6_saddr_score *score,
a9b05723
YH		 1316 struct ipv6_saddr_dst *dst,
1317 int i)
1318{
1319 int ret;
1320
1321 if (i <= score->rule) {
1322 switch (i) {
1323 case IPV6_SADDR_RULE_SCOPE:
1324 ret = score->scopedist;
1325 break;
1326 case IPV6_SADDR_RULE_PREFIX:
1327 ret = score->matchlen;
1328 break;
1329 default:
1330 ret = !!test_bit(i, score->scorebits);
1331 }
1332 goto out;
1333 }
1334
1335 switch (i) {
1336 case IPV6_SADDR_RULE_INIT:
1337 /* Rule 0: remember if hiscore is not ready yet */
1338 ret = !!score->ifa;
1339 break;
1340 case IPV6_SADDR_RULE_LOCAL:
1341 /* Rule 1: Prefer same address */
1342 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1343 break;
1344 case IPV6_SADDR_RULE_SCOPE:
1345 /* Rule 2: Prefer appropriate scope
1346 *
1347 * ret
1348 * ^
1349 * -1 | d 15
1350 * ---+--+-+---> scope
1351 * |
1352 * | d is scope of the destination.
1353 * B-d | \
1354 * | \ <- smaller scope is better if
db9c7c39 1355 * B-15 | \ if scope is enough for destination.
a9b05723
YH		 1356 * | ret = B - scope (-1 <= scope >= d <= 15).
1357 * d-C-1 | /
1358 * |/ <- greater is better
1359 * -C / if scope is not enough for destination.
1360 * /| ret = scope - C (-1 <= d < scope <= 15).
1361 *
1362 * d - C - 1 < B -15 (for all -1 <= d <= 15).
1363 * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1364 * Assume B = 0 and we get C > 29.
1365 */
1366 ret = __ipv6_addr_src_scope(score->addr_type);
1367 if (ret >= dst->scope)
1368 ret = -ret;
1369 else
1370 ret -= 128; /* 30 is enough */
1371 score->scopedist = ret;
1372 break;
1373 case IPV6_SADDR_RULE_PREFERRED:
7fd2561e 1374 {
a9b05723 1375 /* Rule 3: Avoid deprecated and optimistic addresses */
7fd2561e
EK		 1376 u8 avoid = IFA_F_DEPRECATED;
1377
1378 if (!ipv6_use_optimistic_addr(score->ifa->idev))
1379 avoid |= IFA_F_OPTIMISTIC;
a9b05723 1380 ret = ipv6_saddr_preferred(score->addr_type) ||
7fd2561e 1381 !(score->ifa->flags & avoid);
a9b05723 1382 break;
7fd2561e 1383 }
a9b05723
YH		 1384#ifdef CONFIG_IPV6_MIP6
1385 case IPV6_SADDR_RULE_HOA:
7cbca67c 1386 {
a9b05723 1387 /* Rule 4: Prefer home address */
7cbca67c
YH		 1388 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1389 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
a9b05723 1390 break;
7cbca67c 1391 }
a9b05723
YH		 1392#endif
1393 case IPV6_SADDR_RULE_OIF:
1394 /* Rule 5: Prefer outgoing interface */
1395 ret = (!dst->ifindex ||
1396 dst->ifindex == score->ifa->idev->dev->ifindex);
1397 break;
1398 case IPV6_SADDR_RULE_LABEL:
1399 /* Rule 6: Prefer matching label */
3de23255
BT		 1400 ret = ipv6_addr_label(net,
1401 &score->ifa->addr, score->addr_type,
a9b05723
YH		 1402 score->ifa->idev->dev->ifindex) == dst->label;
1403 break;
a9b05723 1404 case IPV6_SADDR_RULE_PRIVACY:
7cbca67c 1405 {
a9b05723 1406 /* Rule 7: Prefer public address
25985edc 1407 * Note: prefer temporary address if use_tempaddr >= 2
a9b05723 1408 */
7cbca67c
YH		 1409 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1410 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1411 score->ifa->idev->cnf.use_tempaddr >= 2;
1412 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
a9b05723 1413 break;
7cbca67c 1414 }
a9b05723
YH		 1415 case IPV6_SADDR_RULE_ORCHID:
1416 /* Rule 8-: Prefer ORCHID vs ORCHID or
1417 * non-ORCHID vs non-ORCHID
1418 */
1419 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1420 ipv6_addr_orchid(dst->addr));
1421 break;
1422 case IPV6_SADDR_RULE_PREFIX:
1423 /* Rule 8: Use longest matching prefix */
91b4b04f
YH		 1424 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr);
1425 if (ret > score->ifa->prefix_len)
1426 ret = score->ifa->prefix_len;
1427 score->matchlen = ret;
a9b05723 1428 break;
7fd2561e
EK		 1429#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1430 case IPV6_SADDR_RULE_NOT_OPTIMISTIC:
1431 /* Optimistic addresses still have lower precedence than other
1432 * preferred addresses.
1433 */
1434 ret = !(score->ifa->flags & IFA_F_OPTIMISTIC);
1435 break;
1436#endif
a9b05723
YH		 1437 default:
1438 ret = 0;
1439 }
1440
1441 if (ret)
1442 __set_bit(i, score->scorebits);
1443 score->rule = i;
1444out:
1445 return ret;
1446}
1447
c0b8da1e
YH		 1448static int __ipv6_dev_get_saddr(struct net *net,
1449 struct ipv6_saddr_dst *dst,
c0b8da1e
YH		 1450 struct inet6_dev *idev,
1451 struct ipv6_saddr_score *scores,
1452 int hiscore_idx)
9131f3de 1453{
c0b8da1e 1454 struct ipv6_saddr_score *score = &scores[1 - hiscore_idx], *hiscore = &scores[hiscore_idx];
9131f3de
YH		 1455
1456 read_lock_bh(&idev->lock);
1457 list_for_each_entry(score->ifa, &idev->addr_list, if_list) {
1458 int i;
1459
1460 /*
1461 * - Tentative Address (RFC2462 section 5.4)
1462 * - A tentative address is not considered
1463 * "assigned to an interface" in the traditional
1464 * sense, unless it is also flagged as optimistic.
1465 * - Candidate Source Address (section 4)
1466 * - In any case, anycast addresses, multicast
1467 * addresses, and the unspecified address MUST
1468 * NOT be included in a candidate set.
1469 */
1470 if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1471 (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
1472 continue;
1473
1474 score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1475
1476 if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1477 score->addr_type & IPV6_ADDR_MULTICAST)) {
1478 net_dbg_ratelimited("ADDRCONF: unspecified / multicast address assigned as unicast address on %s",
1479 idev->dev->name);
1480 continue;
1481 }
1482
1483 score->rule = -1;
1484 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1485
1486 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1487 int minihiscore, miniscore;
1488
1489 minihiscore = ipv6_get_saddr_eval(net, hiscore, dst, i);
1490 miniscore = ipv6_get_saddr_eval(net, score, dst, i);
1491
1492 if (minihiscore > miniscore) {
1493 if (i == IPV6_SADDR_RULE_SCOPE &&
1494 score->scopedist > 0) {
1495 /*
1496 * special case:
1497 * each remaining entry
1498 * has too small (not enough)
1499 * scope, because ifa entries
1500 * are sorted by their scope
1501 * values.
1502 */
1503 goto out;
1504 }
1505 break;
1506 } else if (minihiscore < miniscore) {
1507 if (hiscore->ifa)
1508 in6_ifa_put(hiscore->ifa);
1509
1510 in6_ifa_hold(score->ifa);
1511
1512 swap(hiscore, score);
c0b8da1e 1513 hiscore_idx = 1 - hiscore_idx;
9131f3de
YH		 1514
1515 /* restore our iterator */
1516 score->ifa = hiscore->ifa;
1517
1518 break;
1519 }
1520 }
1521 }
1522out:
1523 read_unlock_bh(&idev->lock);
c0b8da1e 1524 return hiscore_idx;
9131f3de
YH		 1525}
1526
b3f644fc 1527int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev,
9acd9f3a 1528 const struct in6_addr *daddr, unsigned int prefs,
7cbca67c 1529 struct in6_addr *saddr)
1da177e4 1530{
c0b8da1e 1531 struct ipv6_saddr_score scores[2], *hiscore;
a9b05723 1532 struct ipv6_saddr_dst dst;
9131f3de 1533 struct inet6_dev *idev;
072047e4 1534 struct net_device *dev;
a9b05723 1535 int dst_type;
9131f3de 1536 bool use_oif_addr = false;
c0b8da1e 1537 int hiscore_idx = 0;
1da177e4 1538
a9b05723
YH		 1539 dst_type = __ipv6_addr_type(daddr);
1540 dst.addr = daddr;
1541 dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1542 dst.scope = __ipv6_addr_src_scope(dst_type);
3de23255 1543 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
7cbca67c 1544 dst.prefs = prefs;
a9b05723 1545
c0b8da1e
YH		 1546 scores[hiscore_idx].rule = -1;
1547 scores[hiscore_idx].ifa = NULL;
1da177e4 1548
8814c4b5 1549 rcu_read_lock();
1da177e4 1550
9131f3de
YH		 1551 /* Candidate Source Address (section 4)
1552 * - multicast and link-local destination address,
1553 * the set of candidate source address MUST only
1554 * include addresses assigned to interfaces
1555 * belonging to the same link as the outgoing
1556 * interface.
1557 * (- For site-local destination addresses, the
1558 * set of candidate source addresses MUST only
1559 * include addresses assigned to interfaces
1560 * belonging to the same site as the outgoing
1561 * interface.)
3985e8a3
EK		 1562 * - "It is RECOMMENDED that the candidate source addresses
1563 * be the set of unicast addresses assigned to the
1564 * interface that will be used to send to the destination
1565 * (the 'outgoing' interface)." (RFC 6724)
9131f3de
YH		 1566 */
1567 if (dst_dev) {
3985e8a3 1568 idev = __in6_dev_get(dst_dev);
9131f3de 1569 if ((dst_type & IPV6_ADDR_MULTICAST) ||
3985e8a3
EK		 1570 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL ||
1571 (idev && idev->cnf.use_oif_addrs_only)) {
9131f3de
YH		 1572 use_oif_addr = true;
1573 }
1574 }
a9b05723 1575
9131f3de 1576 if (use_oif_addr) {
c0b8da1e 1577 if (idev)
c15df306 1578 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx);
9131f3de
YH		 1579 } else {
1580 for_each_netdev_rcu(net, dev) {
1581 idev = __in6_dev_get(dev);
1582 if (!idev)
072047e4 1583 continue;
c15df306 1584 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx);
1da177e4
LT		 1585 }
1586 }
8814c4b5 1587 rcu_read_unlock();
1da177e4 1588
c0b8da1e 1589 hiscore = &scores[hiscore_idx];
a9b05723 1590 if (!hiscore->ifa)
072047e4 1591 return -EADDRNOTAVAIL;
1ab1457c 1592
4e3fd7a0 1593 *saddr = hiscore->ifa->addr;
a9b05723 1594 in6_ifa_put(hiscore->ifa);
072047e4 1595 return 0;
1da177e4 1596}
5e5f3f0f 1597EXPORT_SYMBOL(ipv6_dev_get_saddr);
1da177e4 1598
8965779d 1599int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr,
479840ff 1600 u32 banned_flags)
b7b1bfce
HFS		 1601{
1602 struct inet6_ifaddr *ifp;
1603 int err = -EADDRNOTAVAIL;
1604
602582ca
HFS		 1605 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
1606 if (ifp->scope > IFA_LINK)
1607 break;
b7b1bfce
HFS		 1608 if (ifp->scope == IFA_LINK &&
1609 !(ifp->flags & banned_flags)) {
1610 *addr = ifp->addr;
1611 err = 0;
1612 break;
1613 }
1614 }
1615 return err;
1616}
1617
95c385b4 1618int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
479840ff 1619 u32 banned_flags)
1da177e4
LT		 1620{
1621 struct inet6_dev *idev;
1622 int err = -EADDRNOTAVAIL;
1623
8814c4b5 1624 rcu_read_lock();
e21e8467
SH		 1625 idev = __in6_dev_get(dev);
1626 if (idev) {
1da177e4 1627 read_lock_bh(&idev->lock);
b7b1bfce 1628 err = __ipv6_get_lladdr(idev, addr, banned_flags);
1da177e4
LT		 1629 read_unlock_bh(&idev->lock);
1630 }
8814c4b5 1631 rcu_read_unlock();
1da177e4
LT		 1632 return err;
1633}
1634
1635static int ipv6_count_addresses(struct inet6_dev *idev)
1636{
1637 int cnt = 0;
1638 struct inet6_ifaddr *ifp;
1639
1640 read_lock_bh(&idev->lock);
502a2ffd 1641 list_for_each_entry(ifp, &idev->addr_list, if_list)
1da177e4
LT		 1642 cnt++;
1643 read_unlock_bh(&idev->lock);
1644 return cnt;
1645}
1646
b71d1d42 1647int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
2a7851bf 1648 const struct net_device *dev, int strict)
c58da4c6
EK		 1649{
1650 return ipv6_chk_addr_and_flags(net, addr, dev, strict, IFA_F_TENTATIVE);
1651}
1652EXPORT_SYMBOL(ipv6_chk_addr);
1653
1654int ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr,
1655 const struct net_device *dev, int strict,
1656 u32 banned_flags)
1da177e4 1657{
eedf042a 1658 struct inet6_ifaddr *ifp;
ddbe5032 1659 unsigned int hash = inet6_addr_hash(addr);
c58da4c6 1660 u32 ifp_flags;
1da177e4 1661
5c578aed 1662 rcu_read_lock_bh();
b67bfe0d 1663 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
878628fb 1664 if (!net_eq(dev_net(ifp->idev->dev), net))
bfeade08 1665 continue;
c58da4c6
EK		 1666 /* Decouple optimistic from tentative for evaluation here.
1667 * Ban optimistic addresses explicitly, when required.
1668 */
1669 ifp_flags = (ifp->flags&IFA_F_OPTIMISTIC)
1670 ? (ifp->flags&~IFA_F_TENTATIVE)
1671 : ifp->flags;
1da177e4 1672 if (ipv6_addr_equal(&ifp->addr, addr) &&
c58da4c6 1673 !(ifp_flags&banned_flags) &&
63159f29 1674 (!dev || ifp->idev->dev == dev ||
eedf042a
SH		 1675 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) {
1676 rcu_read_unlock_bh();
1677 return 1;
1da177e4
LT		 1678 }
1679 }
5c578aed 1680
eedf042a
SH		 1681 rcu_read_unlock_bh();
1682 return 0;
1da177e4 1683}
c58da4c6 1684EXPORT_SYMBOL(ipv6_chk_addr_and_flags);
7159039a 1685
3e81c6da
DM		 1686static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1687 struct net_device *dev)
1da177e4 1688{
ddbe5032 1689 unsigned int hash = inet6_addr_hash(addr);
c2e21293 1690 struct inet6_ifaddr *ifp;
1da177e4 1691
b67bfe0d 1692 hlist_for_each_entry(ifp, &inet6_addr_lst[hash], addr_lst) {
878628fb 1693 if (!net_eq(dev_net(ifp->idev->dev), net))
06bfe655 1694 continue;
1da177e4 1695 if (ipv6_addr_equal(&ifp->addr, addr)) {
63159f29 1696 if (!dev || ifp->idev->dev == dev)
3e81c6da 1697 return true;
1da177e4
LT		 1698 }
1699 }
3e81c6da 1700 return false;
1da177e4
LT		 1701}
1702
7df37ff3
CB		 1703/* Compares an address/prefix_len with addresses on device @dev.
1704 * If one is found it returns true.
1705 */
1706bool ipv6_chk_custom_prefix(const struct in6_addr *addr,
1707 const unsigned int prefix_len, struct net_device *dev)
1708{
1709 struct inet6_dev *idev;
1710 struct inet6_ifaddr *ifa;
1711 bool ret = false;
1712
1713 rcu_read_lock();
1714 idev = __in6_dev_get(dev);
1715 if (idev) {
1716 read_lock_bh(&idev->lock);
1717 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1718 ret = ipv6_prefix_equal(addr, &ifa->addr, prefix_len);
1719 if (ret)
1720 break;
1721 }
1722 read_unlock_bh(&idev->lock);
1723 }
1724 rcu_read_unlock();
1725
1726 return ret;
1727}
1728EXPORT_SYMBOL(ipv6_chk_custom_prefix);
1729
b71d1d42 1730int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev)
52eeeb84
YH		 1731{
1732 struct inet6_dev *idev;
1733 struct inet6_ifaddr *ifa;
1734 int onlink;
1735
1736 onlink = 0;
1737 rcu_read_lock();
1738 idev = __in6_dev_get(dev);
1739 if (idev) {
1740 read_lock_bh(&idev->lock);
502a2ffd 1741 list_for_each_entry(ifa, &idev->addr_list, if_list) {
52eeeb84
YH		 1742 onlink = ipv6_prefix_equal(addr, &ifa->addr,
1743 ifa->prefix_len);
1744 if (onlink)
1745 break;
1746 }
1747 read_unlock_bh(&idev->lock);
1748 }
1749 rcu_read_unlock();
1750 return onlink;
1751}
52eeeb84
YH		 1752EXPORT_SYMBOL(ipv6_chk_prefix);
1753
9acd9f3a 1754struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1cab3da6 1755 struct net_device *dev, int strict)
1da177e4 1756{
b79d1d54 1757 struct inet6_ifaddr *ifp, *result = NULL;
ddbe5032 1758 unsigned int hash = inet6_addr_hash(addr);
1da177e4 1759
5c578aed 1760 rcu_read_lock_bh();
b67bfe0d 1761 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
878628fb 1762 if (!net_eq(dev_net(ifp->idev->dev), net))
1cab3da6 1763 continue;
1da177e4 1764 if (ipv6_addr_equal(&ifp->addr, addr)) {
63159f29 1765 if (!dev || ifp->idev->dev == dev ||
1da177e4 1766 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
b79d1d54 1767 result = ifp;
1da177e4
LT		 1768 in6_ifa_hold(ifp);
1769 break;
1770 }
1771 }
1772 }
5c578aed 1773 rcu_read_unlock_bh();
1da177e4 1774
b79d1d54 1775 return result;
1da177e4
LT		 1776}
1777
1da177e4
LT		 1778/* Gets referenced address, destroys ifaddr */
1779
cc411d0b 1780static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
1da177e4 1781{
3d171f39
LR		 1782 if (dad_failed)
1783 ifp->flags |= IFA_F_DADFAILED;
1784
1da177e4
LT		 1785 if (ifp->flags&IFA_F_PERMANENT) {
1786 spin_lock_bh(&ifp->lock);
c15b1cca 1787 addrconf_del_dad_work(ifp);
1da177e4
LT		 1788 ifp->flags |= IFA_F_TENTATIVE;
1789 spin_unlock_bh(&ifp->lock);
e2577a06
HX		 1790 if (dad_failed)
1791 ipv6_ifa_notify(0, ifp);
1da177e4 1792 in6_ifa_put(ifp);
1da177e4
LT		 1793 } else if (ifp->flags&IFA_F_TEMPORARY) {
1794 struct inet6_ifaddr *ifpub;
1795 spin_lock_bh(&ifp->lock);
1796 ifpub = ifp->ifpub;
1797 if (ifpub) {
1798 in6_ifa_hold(ifpub);
1799 spin_unlock_bh(&ifp->lock);
1800 ipv6_create_tempaddr(ifpub, ifp);
1801 in6_ifa_put(ifpub);
1802 } else {
1803 spin_unlock_bh(&ifp->lock);
1804 }
1805 ipv6_del_addr(ifp);
c15b1cca 1806 } else {
1da177e4 1807 ipv6_del_addr(ifp);
c15b1cca 1808 }
1da177e4
LT		 1809}
1810
f2344a13
HX		 1811static int addrconf_dad_end(struct inet6_ifaddr *ifp)
1812{
1813 int err = -ENOENT;
1814
8e8e676d 1815 spin_lock_bh(&ifp->lock);
f2344a13
HX		 1816 if (ifp->state == INET6_IFADDR_STATE_DAD) {
1817 ifp->state = INET6_IFADDR_STATE_POSTDAD;
1818 err = 0;
1819 }
8e8e676d 1820 spin_unlock_bh(&ifp->lock);
f2344a13
HX		 1821
1822 return err;
1823}
1824
3c21edbd
YH		 1825void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1826{
5f40ef77 1827 struct in6_addr addr;
1b34be74 1828 struct inet6_dev *idev = ifp->idev;
1855b7c3 1829 struct net *net = dev_net(ifp->idev->dev);
9bdd8d40 1830
853dc2e0
UB		 1831 if (addrconf_dad_end(ifp)) {
1832 in6_ifa_put(ifp);
f2344a13 1833 return;
853dc2e0 1834 }
f2344a13 1835
e87cc472
JP		 1836 net_info_ratelimited("%s: IPv6 duplicate address %pI6c detected!\n",
1837 ifp->idev->dev->name, &ifp->addr);
9bdd8d40 1838
5f40ef77
HFS		 1839 spin_lock_bh(&ifp->lock);
1840
1841 if (ifp->flags & IFA_F_STABLE_PRIVACY) {
1842 int scope = ifp->scope;
1843 u32 flags = ifp->flags;
1844 struct in6_addr new_addr;
1845 struct inet6_ifaddr *ifp2;
1846 u32 valid_lft, preferred_lft;
1847 int pfxlen = ifp->prefix_len;
5f40ef77
HFS		 1848 int retries = ifp->stable_privacy_retry + 1;
1849
1855b7c3 1850 if (retries > net->ipv6.sysctl.idgen_retries) {
5f40ef77
HFS		 1851 net_info_ratelimited("%s: privacy stable address generation failed because of DAD conflicts!\n",
1852 ifp->idev->dev->name);
1853 goto errdad;
1854 }
1855
1856 new_addr = ifp->addr;
1857 if (ipv6_generate_stable_address(&new_addr, retries,
1858 idev))
1859 goto errdad;
1860
1861 valid_lft = ifp->valid_lft;
1862 preferred_lft = ifp->prefered_lft;
1863
1864 spin_unlock_bh(&ifp->lock);
1b34be74 1865
5f40ef77
HFS		 1866 if (idev->cnf.max_addresses &&
1867 ipv6_count_addresses(idev) >=
1868 idev->cnf.max_addresses)
1869 goto lock_errdad;
1870
1871 net_info_ratelimited("%s: generating new stable privacy address because of DAD conflict\n",
1872 ifp->idev->dev->name);
1873
1874 ifp2 = ipv6_add_addr(idev, &new_addr, NULL, pfxlen,
1875 scope, flags, valid_lft,
1876 preferred_lft);
1877 if (IS_ERR(ifp2))
1878 goto lock_errdad;
1879
1880 spin_lock_bh(&ifp2->lock);
1881 ifp2->stable_privacy_retry = retries;
1882 ifp2->state = INET6_IFADDR_STATE_PREDAD;
1883 spin_unlock_bh(&ifp2->lock);
1884
1855b7c3 1885 addrconf_mod_dad_work(ifp2, net->ipv6.sysctl.idgen_delay);
5f40ef77
HFS		 1886 in6_ifa_put(ifp2);
1887lock_errdad:
1888 spin_lock_bh(&ifp->lock);
1889 } else if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6) {
1b34be74
YH		 1890 addr.s6_addr32[0] = htonl(0xfe800000);
1891 addr.s6_addr32[1] = 0;
1892
1893 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
1894 ipv6_addr_equal(&ifp->addr, &addr)) {
1895 /* DAD failed for link-local based on MAC address */
1896 idev->cnf.disable_ipv6 = 1;
9bdd8d40 1897
f3213831 1898 pr_info("%s: IPv6 being disabled!\n",
9bdd8d40 1899 ifp->idev->dev->name);
1b34be74
YH		 1900 }
1901 }
1902
5f40ef77 1903errdad:
c15b1cca
HFS		 1904 /* transition from _POSTDAD to _ERRDAD */
1905 ifp->state = INET6_IFADDR_STATE_ERRDAD;
8e8e676d 1906 spin_unlock_bh(&ifp->lock);
c15b1cca
HFS		 1907
1908 addrconf_mod_dad_work(ifp, 0);
3c21edbd 1909}
1da177e4 1910
a9ed4a29
SD		 1911/* Join to solicited addr multicast group.
1912 * caller must hold RTNL */
b71d1d42 1913void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr)
1da177e4
LT		 1914{
1915 struct in6_addr maddr;
1916
1917 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1918 return;
1919
1920 addrconf_addr_solict_mult(addr, &maddr);
1921 ipv6_dev_mc_inc(dev, &maddr);
1922}
1923
a9ed4a29 1924/* caller must hold RTNL */
b71d1d42 1925void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr)
1da177e4
LT		 1926{
1927 struct in6_addr maddr;
1928
1929 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1930 return;
1931
1932 addrconf_addr_solict_mult(addr, &maddr);
1933 __ipv6_dev_mc_dec(idev, &maddr);
1934}
1935
a9ed4a29 1936/* caller must hold RTNL */
20380731 1937static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1da177e4
LT		 1938{
1939 struct in6_addr addr;
c15b1cca 1940
88ad3149 1941 if (ifp->prefix_len >= 127) /* RFC 6164 */
2bda8a0c 1942 return;
1da177e4
LT		 1943 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1944 if (ipv6_addr_any(&addr))
1945 return;
013b4d90 1946 __ipv6_dev_ac_inc(ifp->idev, &addr);
1da177e4
LT		 1947}
1948
a9ed4a29 1949/* caller must hold RTNL */
20380731 1950static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1da177e4
LT		 1951{
1952 struct in6_addr addr;
c15b1cca 1953
88ad3149 1954 if (ifp->prefix_len >= 127) /* RFC 6164 */
32019e65 1955 return;
1da177e4
LT		 1956 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1957 if (ipv6_addr_any(&addr))
1958 return;
1959 __ipv6_dev_ac_dec(ifp->idev, &addr);
1960}
1961
06a4c1c5 1962static int addrconf_ifid_eui64(u8 *eui, struct net_device *dev)
1963{
5241c2d7 1964 if (dev->addr_len != EUI64_ADDR_LEN)
06a4c1c5 1965 return -1;
5241c2d7 1966 memcpy(eui, dev->dev_addr, EUI64_ADDR_LEN);
5e98a36e 1967 eui[0] ^= 2;
06a4c1c5 1968 return 0;
1969}
1970
cb6bf355
YH		 1971static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev)
1972{
1973 union fwnet_hwaddr *ha;
1974
1975 if (dev->addr_len != FWNET_ALEN)
1976 return -1;
1977
1978 ha = (union fwnet_hwaddr *)dev->dev_addr;
1979
1980 memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id));
1981 eui[0] ^= 2;
1982 return 0;
1983}
1984
073a8e0e
YH		 1985static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1986{
1987 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1988 if (dev->addr_len != ARCNET_ALEN)
1989 return -1;
1990 memset(eui, 0, 7);
8e5e8f30 1991 eui[7] = *(u8 *)dev->dev_addr;
073a8e0e
YH		 1992 return 0;
1993}
1994
1995static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1996{
1997 if (dev->addr_len != INFINIBAND_ALEN)
1998 return -1;
1999 memcpy(eui, dev->dev_addr + 12, 8);
2000 eui[0] |= 2;
2001 return 0;
2002}
2003
c61393ea 2004static int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
dfd982ba 2005{
9af28511
SH		 2006 if (addr == 0)
2007 return -1;
dfd982ba
YH		 2008 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
2009 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
2010 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
2011 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
2012 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
2013 ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
2014 eui[1] = 0;
2015 eui[2] = 0x5E;
2016 eui[3] = 0xFE;
2017 memcpy(eui + 4, &addr, 4);
2018 return 0;
2019}
dfd982ba
YH		 2020
2021static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
2022{
2023 if (dev->priv_flags & IFF_ISATAP)
2024 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
2025 return -1;
2026}
2027
aee80b54 2028static int addrconf_ifid_gre(u8 *eui, struct net_device *dev)
2029{
2030 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
2031}
2032
e837735e
ND		 2033static int addrconf_ifid_ip6tnl(u8 *eui, struct net_device *dev)
2034{
2035 memcpy(eui, dev->perm_addr, 3);
2036 memcpy(eui + 5, dev->perm_addr + 3, 3);
2037 eui[3] = 0xFF;
2038 eui[4] = 0xFE;
2039 eui[0] ^= 2;
2040 return 0;
2041}
2042
1da177e4
LT		 2043static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
2044{
2045 switch (dev->type) {
2046 case ARPHRD_ETHER:
2047 case ARPHRD_FDDI:
073a8e0e 2048 return addrconf_ifid_eui48(eui, dev);
1da177e4 2049 case ARPHRD_ARCNET:
073a8e0e 2050 return addrconf_ifid_arcnet(eui, dev);
1da177e4 2051 case ARPHRD_INFINIBAND:
073a8e0e 2052 return addrconf_ifid_infiniband(eui, dev);
c7dc89c0 2053 case ARPHRD_SIT:
dfd982ba 2054 return addrconf_ifid_sit(eui, dev);
aee80b54 2055 case ARPHRD_IPGRE:
2056 return addrconf_ifid_gre(eui, dev);
e74bccb8 2057 case ARPHRD_6LOWPAN:
06a4c1c5 2058 return addrconf_ifid_eui64(eui, dev);
cb6bf355
YH		 2059 case ARPHRD_IEEE1394:
2060 return addrconf_ifid_ieee1394(eui, dev);
e837735e
ND		 2061 case ARPHRD_TUNNEL6:
2062 return addrconf_ifid_ip6tnl(eui, dev);
1da177e4
LT		 2063 }
2064 return -1;
2065}
2066
2067static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
2068{
2069 int err = -1;
2070 struct inet6_ifaddr *ifp;
2071
2072 read_lock_bh(&idev->lock);
602582ca
HFS		 2073 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
2074 if (ifp->scope > IFA_LINK)
2075 break;
1da177e4
LT		 2076 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
2077 memcpy(eui, ifp->addr.s6_addr+8, 8);
2078 err = 0;
2079 break;
2080 }
2081 }
2082 read_unlock_bh(&idev->lock);
2083 return err;
2084}
2085
1da177e4 2086/* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
eb7e0575 2087static void __ipv6_regen_rndid(struct inet6_dev *idev)
1da177e4 2088{
1da177e4 2089regen:
955189ef 2090 get_random_bytes(idev->rndid, sizeof(idev->rndid));
1da177e4 2091 idev->rndid[0] &= ~0x02;
1da177e4
LT		 2092
2093 /*
2094 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
2095 * check if generated address is not inappropriate
2096 *
2097 * - Reserved subnet anycast (RFC 2526)
2098 * 11111101 11....11 1xxxxxxx
c7dc89c0 2099 * - ISATAP (RFC4214) 6.1
1da177e4
LT		 2100 * 00-00-5E-FE-xx-xx-xx-xx
2101 * - value 0
2102 * - XXX: already assigned to an address on the device
2103 */
1ab1457c 2104 if (idev->rndid[0] == 0xfd &&
1da177e4
LT		 2105 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
2106 (idev->rndid[7]&0x80))
2107 goto regen;
2108 if ((idev->rndid[0]|idev->rndid[1]) == 0) {
2109 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
2110 goto regen;
2111 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
2112 goto regen;
2113 }
1da177e4
LT		 2114}
2115
2116static void ipv6_regen_rndid(unsigned long data)
2117{
2118 struct inet6_dev *idev = (struct inet6_dev *) data;
2119 unsigned long expires;
2120
8814c4b5 2121 rcu_read_lock_bh();
1da177e4
LT		 2122 write_lock_bh(&idev->lock);
2123
2124 if (idev->dead)
2125 goto out;
2126
eb7e0575 2127 __ipv6_regen_rndid(idev);
1ab1457c 2128
1da177e4 2129 expires = jiffies +
1ab1457c 2130 idev->cnf.temp_prefered_lft * HZ -
1f9248e5
JP		 2131 idev->cnf.regen_max_retry * idev->cnf.dad_transmits *
2132 NEIGH_VAR(idev->nd_parms, RETRANS_TIME) -
784e2710 2133 idev->cnf.max_desync_factor * HZ;
1da177e4 2134 if (time_before(expires, jiffies)) {
f3213831
JP		 2135 pr_warn("%s: too short regeneration interval; timer disabled for %s\n",
2136 __func__, idev->dev->name);
1da177e4
LT		 2137 goto out;
2138 }
2139
2140 if (!mod_timer(&idev->regen_timer, expires))
2141 in6_dev_hold(idev);
2142
2143out:
2144 write_unlock_bh(&idev->lock);
8814c4b5 2145 rcu_read_unlock_bh();
1da177e4
LT		 2146 in6_dev_put(idev);
2147}
2148
eb7e0575 2149static void __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr)
8e5e8f30 2150{
1da177e4 2151 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
eb7e0575 2152 __ipv6_regen_rndid(idev);
1da177e4 2153}
1da177e4
LT		 2154
2155/*
2156 * Add prefix route.
2157 */
2158
2159static void
2160addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
e431b8c0 2161 unsigned long expires, u32 flags)
1da177e4 2162{
86872cb5 2163 struct fib6_config cfg = {
ca254490 2164 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX,
86872cb5
TG		 2165 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2166 .fc_ifindex = dev->ifindex,
2167 .fc_expires = expires,
2168 .fc_dst_len = plen,
2169 .fc_flags = RTF_UP | flags,
c346dca1 2170 .fc_nlinfo.nl_net = dev_net(dev),
f410a1fb 2171 .fc_protocol = RTPROT_KERNEL,
86872cb5 2172 };
1da177e4 2173
4e3fd7a0 2174 cfg.fc_dst = *pfx;
1da177e4
LT		 2175
2176 /* Prevent useless cloning on PtP SIT.
2177 This thing is done here expecting that the whole
2178 class of non-broadcast devices need not cloning.
2179 */
07a93626 2180#if IS_ENABLED(CONFIG_IPV6_SIT)
86872cb5
TG		 2181 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
2182 cfg.fc_flags |= RTF_NONEXTHOP;
0be669bb 2183#endif
1da177e4 2184
86872cb5 2185 ip6_route_add(&cfg);
1da177e4
LT		 2186}
2187
14ef37b6
AH		 2188
2189static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
2190 int plen,
2191 const struct net_device *dev,
2192 u32 flags, u32 noflags)
2193{
2194 struct fib6_node *fn;
2195 struct rt6_info *rt = NULL;
2196 struct fib6_table *table;
ca254490 2197 u32 tb_id = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX;
14ef37b6 2198
ca254490 2199 table = fib6_get_table(dev_net(dev), tb_id);
63159f29 2200 if (!table)
14ef37b6
AH		 2201 return NULL;
2202
5744dd9b 2203 read_lock_bh(&table->tb6_lock);
14ef37b6
AH		 2204 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0);
2205 if (!fn)
2206 goto out;
1f56a01f
MKL		 2207
2208 noflags |= RTF_CACHE;
14ef37b6 2209 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
d1918542 2210 if (rt->dst.dev->ifindex != dev->ifindex)
14ef37b6
AH		 2211 continue;
2212 if ((rt->rt6i_flags & flags) != flags)
2213 continue;
85da53bf 2214 if ((rt->rt6i_flags & noflags) != 0)
14ef37b6
AH		 2215 continue;
2216 dst_hold(&rt->dst);
2217 break;
2218 }
2219out:
5744dd9b 2220 read_unlock_bh(&table->tb6_lock);
14ef37b6
AH		 2221 return rt;
2222}
2223
2224
1da177e4
LT		 2225/* Create "default" multicast route to the interface */
2226
2227static void addrconf_add_mroute(struct net_device *dev)
2228{
86872cb5 2229 struct fib6_config cfg = {
ca254490 2230 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_LOCAL,
86872cb5
TG		 2231 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2232 .fc_ifindex = dev->ifindex,
2233 .fc_dst_len = 8,
2234 .fc_flags = RTF_UP,
c346dca1 2235 .fc_nlinfo.nl_net = dev_net(dev),
86872cb5
TG		 2236 };
2237
2238 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
2239
2240 ip6_route_add(&cfg);
1da177e4
LT		 2241}
2242
1da177e4
LT		 2243static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
2244{
2245 struct inet6_dev *idev;
2246
2247 ASSERT_RTNL();
2248
e21e8467
SH		 2249 idev = ipv6_find_idev(dev);
2250 if (!idev)
64e724f6
BH		 2251 return ERR_PTR(-ENOBUFS);
2252
2253 if (idev->cnf.disable_ipv6)
2254 return ERR_PTR(-EACCES);
1da177e4
LT		 2255
2256 /* Add default multicast route */
ba46ee4c 2257 if (!(dev->flags & IFF_LOOPBACK) && !netif_is_l3_master(dev))
4af04aba 2258 addrconf_add_mroute(dev);
1da177e4 2259
1da177e4
LT		 2260 return idev;
2261}
2262
53bd6749
JP		 2263static void manage_tempaddrs(struct inet6_dev *idev,
2264 struct inet6_ifaddr *ifp,
2265 __u32 valid_lft, __u32 prefered_lft,
2266 bool create, unsigned long now)
2267{
2268 u32 flags;
2269 struct inet6_ifaddr *ift;
2270
2271 read_lock_bh(&idev->lock);
2272 /* update all temporary addresses in the list */
2273 list_for_each_entry(ift, &idev->tempaddr_list, tmp_list) {
2274 int age, max_valid, max_prefered;
2275
2276 if (ifp != ift->ifpub)
2277 continue;
2278
2279 /* RFC 4941 section 3.3:
2280 * If a received option will extend the lifetime of a public
2281 * address, the lifetimes of temporary addresses should
2282 * be extended, subject to the overall constraint that no
2283 * temporary addresses should ever remain "valid" or "preferred"
2284 * for a time longer than (TEMP_VALID_LIFETIME) or
2285 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), respectively.
2286 */
2287 age = (now - ift->cstamp) / HZ;
2288 max_valid = idev->cnf.temp_valid_lft - age;
2289 if (max_valid < 0)
2290 max_valid = 0;
2291
2292 max_prefered = idev->cnf.temp_prefered_lft -
2293 idev->cnf.max_desync_factor - age;
2294 if (max_prefered < 0)
2295 max_prefered = 0;
2296
2297 if (valid_lft > max_valid)
2298 valid_lft = max_valid;
2299
2300 if (prefered_lft > max_prefered)
2301 prefered_lft = max_prefered;
2302
2303 spin_lock(&ift->lock);
2304 flags = ift->flags;
2305 ift->valid_lft = valid_lft;
2306 ift->prefered_lft = prefered_lft;
2307 ift->tstamp = now;
2308 if (prefered_lft > 0)
2309 ift->flags &= ~IFA_F_DEPRECATED;
2310
2311 spin_unlock(&ift->lock);
2312 if (!(flags&IFA_F_TENTATIVE))
2313 ipv6_ifa_notify(0, ift);
2314 }
2315
2316 if ((create || list_empty(&idev->tempaddr_list)) &&
2317 idev->cnf.use_tempaddr > 0) {
2318 /* When a new public address is created as described
2319 * in [ADDRCONF], also create a new temporary address.
2320 * Also create a temporary address if it's enabled but
2321 * no temporary address currently exists.
2322 */
2323 read_unlock_bh(&idev->lock);
2324 ipv6_create_tempaddr(ifp, NULL);
2325 } else {
2326 read_unlock_bh(&idev->lock);
2327 }
2328}
2329
cc9da6cc
BM		 2330static bool is_addr_mode_generate_stable(struct inet6_dev *idev)
2331{
2332 return idev->addr_gen_mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY ||
2333 idev->addr_gen_mode == IN6_ADDR_GEN_MODE_RANDOM;
2334}
2335
cc84b3c6
AA		 2336int addrconf_prefix_rcv_add_addr(struct net *net, struct net_device *dev,
2337 const struct prefix_info *pinfo,
2338 struct inet6_dev *in6_dev,
2339 const struct in6_addr *addr, int addr_type,
2340 u32 addr_flags, bool sllao, bool tokenized,
2341 __u32 valid_lft, u32 prefered_lft)
4f672235
AA		 2342{
2343 struct inet6_ifaddr *ifp = ipv6_get_ifaddr(net, addr, dev, 1);
2344 int create = 0, update_lft = 0;
2345
2346 if (!ifp && valid_lft) {
2347 int max_addresses = in6_dev->cnf.max_addresses;
2348
2349#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2350 if (in6_dev->cnf.optimistic_dad &&
2351 !net->ipv6.devconf_all->forwarding && sllao)
2352 addr_flags |= IFA_F_OPTIMISTIC;
2353#endif
2354
2355 /* Do not allow to create too much of autoconfigured
2356 * addresses; this would be too easy way to crash kernel.
2357 */
2358 if (!max_addresses ||
2359 ipv6_count_addresses(in6_dev) < max_addresses)
2360 ifp = ipv6_add_addr(in6_dev, addr, NULL,
2361 pinfo->prefix_len,
2362 addr_type&IPV6_ADDR_SCOPE_MASK,
2363 addr_flags, valid_lft,
2364 prefered_lft);
2365
2366 if (IS_ERR_OR_NULL(ifp))
2367 return -1;
2368
2369 update_lft = 0;
2370 create = 1;
2371 spin_lock_bh(&ifp->lock);
2372 ifp->flags |= IFA_F_MANAGETEMPADDR;
2373 ifp->cstamp = jiffies;
2374 ifp->tokenized = tokenized;
2375 spin_unlock_bh(&ifp->lock);
2376 addrconf_dad_start(ifp);
2377 }
2378
2379 if (ifp) {
2380 u32 flags;
2381 unsigned long now;
2382 u32 stored_lft;
2383
2384 /* update lifetime (RFC2462 5.5.3 e) */
2385 spin_lock_bh(&ifp->lock);
2386 now = jiffies;
2387 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
2388 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
2389 else
2390 stored_lft = 0;
2391 if (!update_lft && !create && stored_lft) {
2392 const u32 minimum_lft = min_t(u32,
2393 stored_lft, MIN_VALID_LIFETIME);
2394 valid_lft = max(valid_lft, minimum_lft);
2395
2396 /* RFC4862 Section 5.5.3e:
2397 * "Note that the preferred lifetime of the
2398 * corresponding address is always reset to
2399 * the Preferred Lifetime in the received
2400 * Prefix Information option, regardless of
2401 * whether the valid lifetime is also reset or
2402 * ignored."
2403 *
2404 * So we should always update prefered_lft here.
2405 */
2406 update_lft = 1;
2407 }
2408
2409 if (update_lft) {
2410 ifp->valid_lft = valid_lft;
2411 ifp->prefered_lft = prefered_lft;
2412 ifp->tstamp = now;
2413 flags = ifp->flags;
2414 ifp->flags &= ~IFA_F_DEPRECATED;
2415 spin_unlock_bh(&ifp->lock);
2416
2417 if (!(flags&IFA_F_TENTATIVE))
2418 ipv6_ifa_notify(0, ifp);
2419 } else
2420 spin_unlock_bh(&ifp->lock);
2421
2422 manage_tempaddrs(in6_dev, ifp, valid_lft, prefered_lft,
2423 create, now);
2424
2425 in6_ifa_put(ifp);
2426 addrconf_verify();
2427 }
2428
2429 return 0;
2430}
cc84b3c6 2431EXPORT_SYMBOL_GPL(addrconf_prefix_rcv_add_addr);
4f672235 2432
e6bff995 2433void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao)
1da177e4
LT		 2434{
2435 struct prefix_info *pinfo;
2436 __u32 valid_lft;
2437 __u32 prefered_lft;
4f672235 2438 int addr_type, err;
64236f3f 2439 u32 addr_flags = 0;
1da177e4 2440 struct inet6_dev *in6_dev;
56d417b1 2441 struct net *net = dev_net(dev);
1da177e4
LT		 2442
2443 pinfo = (struct prefix_info *) opt;
1ab1457c 2444
1da177e4 2445 if (len < sizeof(struct prefix_info)) {
ba3542e1 2446 ADBG("addrconf: prefix option too short\n");
1da177e4
LT		 2447 return;
2448 }
1ab1457c 2449
1da177e4
LT		 2450 /*
2451 * Validation checks ([ADDRCONF], page 19)
2452 */
2453
2454 addr_type = ipv6_addr_type(&pinfo->prefix);
2455
2456 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
2457 return;
2458
2459 valid_lft = ntohl(pinfo->valid);
2460 prefered_lft = ntohl(pinfo->prefered);
2461
2462 if (prefered_lft > valid_lft) {
e87cc472 2463 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n");
1da177e4
LT		 2464 return;
2465 }
2466
2467 in6_dev = in6_dev_get(dev);
2468
63159f29 2469 if (!in6_dev) {
e87cc472
JP		 2470 net_dbg_ratelimited("addrconf: device %s not configured\n",
2471 dev->name);
1da177e4
LT		 2472 return;
2473 }
2474
2475 /*
2476 * Two things going on here:
2477 * 1) Add routes for on-link prefixes
2478 * 2) Configure prefixes with the auto flag set
2479 */
2480
4bed72e4
YH		 2481 if (pinfo->onlink) {
2482 struct rt6_info *rt;
2483 unsigned long rt_expires;
2484
6f704992
YH		 2485 /* Avoid arithmetic overflow. Really, we could
2486 * save rt_expires in seconds, likely valid_lft,
2487 * but it would require division in fib gc, that it
2488 * not good.
2489 */
4bed72e4
YH		 2490 if (HZ > USER_HZ)
2491 rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
2492 else
2493 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
3dd4bc68 2494
4bed72e4
YH		 2495 if (addrconf_finite_timeout(rt_expires))
2496 rt_expires *= HZ;
1da177e4 2497
14ef37b6
AH		 2498 rt = addrconf_get_prefix_route(&pinfo->prefix,
2499 pinfo->prefix_len,
2500 dev,
2501 RTF_ADDRCONF | RTF_PREFIX_RT,
2502 RTF_GATEWAY | RTF_DEFAULT);
1da177e4 2503
14ef37b6 2504 if (rt) {
6f704992
YH		 2505 /* Autoconf prefix route */
2506 if (valid_lft == 0) {
2507 ip6_del_rt(rt);
2508 rt = NULL;
4bed72e4 2509 } else if (addrconf_finite_timeout(rt_expires)) {
6f704992 2510 /* not infinity */
1716a961 2511 rt6_set_expires(rt, jiffies + rt_expires);
6f704992 2512 } else {
1716a961 2513 rt6_clean_expires(rt);
1da177e4
LT		 2514 }
2515 } else if (valid_lft) {
6f704992 2516 clock_t expires = 0;
4bed72e4
YH		 2517 int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
2518 if (addrconf_finite_timeout(rt_expires)) {
6f704992
YH		 2519 /* not infinity */
2520 flags |= RTF_EXPIRES;
2521 expires = jiffies_to_clock_t(rt_expires);
2522 }
1da177e4 2523 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
6f704992 2524 dev, expires, flags);
1da177e4 2525 }
94e187c0 2526 ip6_rt_put(rt);
1da177e4
LT		 2527 }
2528
2529 /* Try to figure out our local address for this prefix */
2530
2531 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
1da177e4 2532 struct in6_addr addr;
f997c55c 2533 bool tokenized = false, dev_addr_generated = false;
1da177e4
LT		 2534
2535 if (pinfo->prefix_len == 64) {
2536 memcpy(&addr, &pinfo->prefix, 8);
f53adae4
DB		 2537
2538 if (!ipv6_addr_any(&in6_dev->token)) {
2539 read_lock_bh(&in6_dev->lock);
2540 memcpy(addr.s6_addr + 8,
2541 in6_dev->token.s6_addr + 8, 8);
2542 read_unlock_bh(&in6_dev->lock);
617fe29d 2543 tokenized = true;
cc9da6cc 2544 } else if (is_addr_mode_generate_stable(in6_dev) &&
622c81d5
HFS		 2545 !ipv6_generate_stable_address(&addr, 0,
2546 in6_dev)) {
64236f3f 2547 addr_flags |= IFA_F_STABLE_PRIVACY;
622c81d5 2548 goto ok;
f53adae4
DB		 2549 } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
2550 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
4f672235 2551 goto put;
f997c55c
AA		 2552 } else {
2553 dev_addr_generated = true;
1da177e4
LT		 2554 }
2555 goto ok;
2556 }
e87cc472
JP		 2557 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n",
2558 pinfo->prefix_len);
4f672235 2559 goto put;
1da177e4
LT		 2560
2561ok:
4f672235
AA		 2562 err = addrconf_prefix_rcv_add_addr(net, dev, pinfo, in6_dev,
2563 &addr, addr_type,
2564 addr_flags, sllao,
2565 tokenized, valid_lft,
2566 prefered_lft);
2567 if (err)
2568 goto put;
f997c55c
AA		 2569
2570 /* Ignore error case here because previous prefix add addr was
2571 * successful which will be notified.
2572 */
2573 ndisc_ops_prefix_rcv_add_addr(net, dev, pinfo, in6_dev, &addr,
2574 addr_type, addr_flags, sllao,
2575 tokenized, valid_lft,
2576 prefered_lft,
2577 dev_addr_generated);
1da177e4
LT		 2578 }
2579 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
4f672235 2580put:
1da177e4
LT		 2581 in6_dev_put(in6_dev);
2582}
2583
2584/*
2585 * Set destination address.
2586 * Special case for SIT interfaces where we create a new "virtual"
2587 * device.
2588 */
af284937 2589int addrconf_set_dstaddr(struct net *net, void __user *arg)
1da177e4
LT		 2590{
2591 struct in6_ifreq ireq;
2592 struct net_device *dev;
2593 int err = -EINVAL;
2594
2595 rtnl_lock();
2596
2597 err = -EFAULT;
2598 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2599 goto err_exit;
2600
af284937 2601 dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
1da177e4
LT		 2602
2603 err = -ENODEV;
63159f29 2604 if (!dev)
1da177e4
LT		 2605 goto err_exit;
2606
07a93626 2607#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4 2608 if (dev->type == ARPHRD_SIT) {
5bc3eb7e 2609 const struct net_device_ops *ops = dev->netdev_ops;
1da177e4 2610 struct ifreq ifr;
1da177e4
LT		 2611 struct ip_tunnel_parm p;
2612
2613 err = -EADDRNOTAVAIL;
2614 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2615 goto err_exit;
2616
2617 memset(&p, 0, sizeof(p));
2618 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2619 p.iph.saddr = 0;
2620 p.iph.version = 4;
2621 p.iph.ihl = 5;
2622 p.iph.protocol = IPPROTO_IPV6;
2623 p.iph.ttl = 64;
d20b3109 2624 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
1da177e4 2625
5bc3eb7e
SH		 2626 if (ops->ndo_do_ioctl) {
2627 mm_segment_t oldfs = get_fs();
2628
2629 set_fs(KERNEL_DS);
2630 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2631 set_fs(oldfs);
2632 } else
2633 err = -EOPNOTSUPP;
1da177e4
LT		 2634
2635 if (err == 0) {
2636 err = -ENOBUFS;
af284937
DL		 2637 dev = __dev_get_by_name(net, p.name);
2638 if (!dev)
1da177e4
LT		 2639 goto err_exit;
2640 err = dev_open(dev);
2641 }
2642 }
0be669bb 2643#endif
1da177e4
LT		 2644
2645err_exit:
2646 rtnl_unlock();
2647 return err;
2648}
2649
93a714d6
MC		 2650static int ipv6_mc_config(struct sock *sk, bool join,
2651 const struct in6_addr *addr, int ifindex)
2652{
2653 int ret;
2654
2655 ASSERT_RTNL();
2656
2657 lock_sock(sk);
2658 if (join)
54ff9ef3 2659 ret = ipv6_sock_mc_join(sk, ifindex, addr);
93a714d6 2660 else
54ff9ef3 2661 ret = ipv6_sock_mc_drop(sk, ifindex, addr);
93a714d6
MC		 2662 release_sock(sk);
2663
2664 return ret;
2665}
2666
1da177e4
LT		 2667/*
2668 * Manual configuration of address on an interface
2669 */
479840ff
JP		 2670static int inet6_addr_add(struct net *net, int ifindex,
2671 const struct in6_addr *pfx,
caeaba79 2672 const struct in6_addr *peer_pfx,
479840ff
JP		 2673 unsigned int plen, __u32 ifa_flags,
2674 __u32 prefered_lft, __u32 valid_lft)
1da177e4
LT		 2675{
2676 struct inet6_ifaddr *ifp;
2677 struct inet6_dev *idev;
2678 struct net_device *dev;
93a714d6
MC		 2679 unsigned long timeout;
2680 clock_t expires;
1da177e4 2681 int scope;
6f704992 2682 u32 flags;
1da177e4
LT		 2683
2684 ASSERT_RTNL();
1ab1457c 2685
24ef0da7
TG		 2686 if (plen > 128)
2687 return -EINVAL;
2688
0778769d
NT		 2689 /* check the lifetime */
2690 if (!valid_lft || prefered_lft > valid_lft)
2691 return -EINVAL;
2692
53bd6749
JP		 2693 if (ifa_flags & IFA_F_MANAGETEMPADDR && plen != 64)
2694 return -EINVAL;
2695
af284937
DL		 2696 dev = __dev_get_by_index(net, ifindex);
2697 if (!dev)
1da177e4 2698 return -ENODEV;
1ab1457c 2699
64e724f6
BH		 2700 idev = addrconf_add_dev(dev);
2701 if (IS_ERR(idev))
2702 return PTR_ERR(idev);
1da177e4 2703
93a714d6
MC		 2704 if (ifa_flags & IFA_F_MCAUTOJOIN) {
2705 int ret = ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2706 true, pfx, ifindex);
2707
2708 if (ret < 0)
2709 return ret;
2710 }
2711
1da177e4
LT		 2712 scope = ipv6_addr_scope(pfx);
2713
4bed72e4
YH		 2714 timeout = addrconf_timeout_fixup(valid_lft, HZ);
2715 if (addrconf_finite_timeout(timeout)) {
2716 expires = jiffies_to_clock_t(timeout * HZ);
2717 valid_lft = timeout;
6f704992 2718 flags = RTF_EXPIRES;
4bed72e4
YH		 2719 } else {
2720 expires = 0;
2721 flags = 0;
2722 ifa_flags |= IFA_F_PERMANENT;
6f704992 2723 }
0778769d 2724
4bed72e4
YH		 2725 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
2726 if (addrconf_finite_timeout(timeout)) {
2727 if (timeout == 0)
2728 ifa_flags |= IFA_F_DEPRECATED;
2729 prefered_lft = timeout;
2730 }
0778769d 2731
8a226b2c
JB		 2732 ifp = ipv6_add_addr(idev, pfx, peer_pfx, plen, scope, ifa_flags,
2733 valid_lft, prefered_lft);
0778769d 2734
1da177e4 2735 if (!IS_ERR(ifp)) {
761aac73
TH		 2736 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) {
2737 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
2738 expires, flags);
2739 }
2740
95c385b4
NH		 2741 /*
2742 * Note that section 3.1 of RFC 4429 indicates
2743 * that the Optimistic flag should not be set for
2744 * manually configured addresses
2745 */
cf22f9a2 2746 addrconf_dad_start(ifp);
53bd6749
JP		 2747 if (ifa_flags & IFA_F_MANAGETEMPADDR)
2748 manage_tempaddrs(idev, ifp, valid_lft, prefered_lft,
2749 true, jiffies);
1da177e4 2750 in6_ifa_put(ifp);
c15b1cca 2751 addrconf_verify_rtnl();
1da177e4 2752 return 0;
93a714d6
MC		 2753 } else if (ifa_flags & IFA_F_MCAUTOJOIN) {
2754 ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2755 false, pfx, ifindex);
1da177e4
LT		 2756 }
2757
2758 return PTR_ERR(ifp);
2759}
2760
6046d5b4
HK		 2761static int inet6_addr_del(struct net *net, int ifindex, u32 ifa_flags,
2762 const struct in6_addr *pfx, unsigned int plen)
1da177e4
LT		 2763{
2764 struct inet6_ifaddr *ifp;
2765 struct inet6_dev *idev;
2766 struct net_device *dev;
1ab1457c 2767
24ef0da7
TG		 2768 if (plen > 128)
2769 return -EINVAL;
2770
af284937
DL		 2771 dev = __dev_get_by_index(net, ifindex);
2772 if (!dev)
1da177e4
LT		 2773 return -ENODEV;
2774
e5d08d71 2775 idev = __in6_dev_get(dev);
63159f29 2776 if (!idev)
1da177e4
LT		 2777 return -ENXIO;
2778
2779 read_lock_bh(&idev->lock);
502a2ffd 2780 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1da177e4
LT		 2781 if (ifp->prefix_len == plen &&
2782 ipv6_addr_equal(pfx, &ifp->addr)) {
2783 in6_ifa_hold(ifp);
2784 read_unlock_bh(&idev->lock);
1ab1457c 2785
6046d5b4
HK		 2786 if (!(ifp->flags & IFA_F_TEMPORARY) &&
2787 (ifa_flags & IFA_F_MANAGETEMPADDR))
2788 manage_tempaddrs(idev, ifp, 0, 0, false,
2789 jiffies);
1da177e4 2790 ipv6_del_addr(ifp);
6046d5b4 2791 addrconf_verify_rtnl();
93a714d6
MC		 2792 if (ipv6_addr_is_multicast(pfx)) {
2793 ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2794 false, pfx, dev->ifindex);
2795 }
1da177e4
LT		 2796 return 0;
2797 }
2798 }
2799 read_unlock_bh(&idev->lock);
2800 return -EADDRNOTAVAIL;
2801}
2802
2803
af284937 2804int addrconf_add_ifaddr(struct net *net, void __user *arg)
1da177e4
LT		 2805{
2806 struct in6_ifreq ireq;
2807 int err;
1ab1457c 2808
af31f412 2809 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1da177e4 2810 return -EPERM;
1ab1457c 2811
1da177e4
LT		 2812 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2813 return -EFAULT;
2814
2815 rtnl_lock();
caeaba79 2816 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, NULL,
af284937
DL		 2817 ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2818 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
1da177e4
LT		 2819 rtnl_unlock();
2820 return err;
2821}
2822
af284937 2823int addrconf_del_ifaddr(struct net *net, void __user *arg)
1da177e4
LT		 2824{
2825 struct in6_ifreq ireq;
2826 int err;
1ab1457c 2827
af31f412 2828 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1da177e4
LT		 2829 return -EPERM;
2830
2831 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2832 return -EFAULT;
2833
2834 rtnl_lock();
6046d5b4 2835 err = inet6_addr_del(net, ireq.ifr6_ifindex, 0, &ireq.ifr6_addr,
af284937 2836 ireq.ifr6_prefixlen);
1da177e4
LT		 2837 rtnl_unlock();
2838 return err;
2839}
2840
b5f348e5
IJ		 2841static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
2842 int plen, int scope)
2843{
2844 struct inet6_ifaddr *ifp;
2845
8a226b2c 2846 ifp = ipv6_add_addr(idev, addr, NULL, plen,
07edd741
HFS		 2847 scope, IFA_F_PERMANENT,
2848 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
b5f348e5
IJ		 2849 if (!IS_ERR(ifp)) {
2850 spin_lock_bh(&ifp->lock);
2851 ifp->flags &= ~IFA_F_TENTATIVE;
2852 spin_unlock_bh(&ifp->lock);
2853 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2854 in6_ifa_put(ifp);
2855 }
2856}
2857
07a93626 2858#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4
LT		 2859static void sit_add_v4_addrs(struct inet6_dev *idev)
2860{
1da177e4
LT		 2861 struct in6_addr addr;
2862 struct net_device *dev;
c346dca1 2863 struct net *net = dev_net(idev->dev);
929c9cf3 2864 int scope, plen;
f0e2acfa 2865 u32 pflags = 0;
1da177e4
LT		 2866
2867 ASSERT_RTNL();
2868
2869 memset(&addr, 0, sizeof(struct in6_addr));
2870 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2871
2872 if (idev->dev->flags&IFF_POINTOPOINT) {
2873 addr.s6_addr32[0] = htonl(0xfe800000);
2874 scope = IFA_LINK;
929c9cf3 2875 plen = 64;
1da177e4
LT		 2876 } else {
2877 scope = IPV6_ADDR_COMPATv4;
929c9cf3 2878 plen = 96;
f0e2acfa 2879 pflags |= RTF_NONEXTHOP;
1da177e4
LT		 2880 }
2881
2882 if (addr.s6_addr32[3]) {
929c9cf3 2883 add_addr(idev, &addr, plen, scope);
f0e2acfa 2884 addrconf_prefix_route(&addr, plen, idev->dev, 0, pflags);
1da177e4
LT		 2885 return;
2886 }
2887
6fda7350 2888 for_each_netdev(net, dev) {
8e5e8f30 2889 struct in_device *in_dev = __in_dev_get_rtnl(dev);
1da177e4 2890 if (in_dev && (dev->flags & IFF_UP)) {
8e5e8f30 2891 struct in_ifaddr *ifa;
1da177e4
LT		 2892
2893 int flag = scope;
2894
2895 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
1da177e4
LT		 2896
2897 addr.s6_addr32[3] = ifa->ifa_local;
2898
2899 if (ifa->ifa_scope == RT_SCOPE_LINK)
2900 continue;
2901 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2902 if (idev->dev->flags&IFF_POINTOPOINT)
2903 continue;
2904 flag |= IFA_HOST;
2905 }
1da177e4 2906
b5f348e5 2907 add_addr(idev, &addr, plen, flag);
f0e2acfa
ND		 2908 addrconf_prefix_route(&addr, plen, idev->dev, 0,
2909 pflags);
1da177e4
LT		 2910 }
2911 }
1ab1457c 2912 }
1da177e4 2913}
0be669bb 2914#endif
1da177e4
LT		 2915
2916static void init_loopback(struct net_device *dev)
2917{
2918 struct inet6_dev *idev;
25fb6ca4
BK		 2919 struct net_device *sp_dev;
2920 struct inet6_ifaddr *sp_ifa;
2921 struct rt6_info *sp_rt;
1da177e4
LT		 2922
2923 /* ::1 */
2924
2925 ASSERT_RTNL();
2926
e5d08d71 2927 idev = ipv6_find_idev(dev);
63159f29 2928 if (!idev) {
91df42be 2929 pr_debug("%s: add_dev failed\n", __func__);
1da177e4
LT		 2930 return;
2931 }
2932
b5f348e5 2933 add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
25fb6ca4
BK		 2934
2935 /* Add routes to other interface's IPv6 addresses */
2936 for_each_netdev(dev_net(dev), sp_dev) {
2937 if (!strcmp(sp_dev->name, dev->name))
2938 continue;
2939
2940 idev = __in6_dev_get(sp_dev);
2941 if (!idev)
2942 continue;
2943
2944 read_lock_bh(&idev->lock);
2945 list_for_each_entry(sp_ifa, &idev->addr_list, if_list) {
2946
2947 if (sp_ifa->flags & (IFA_F_DADFAILED | IFA_F_TENTATIVE))
2948 continue;
2949
33d99113
G		 2950 if (sp_ifa->rt) {
2951 /* This dst has been added to garbage list when
2952 * lo device down, release this obsolete dst and
2953 * reallocate a new router for ifa.
2954 */
2955 if (sp_ifa->rt->dst.obsolete > 0) {
2956 ip6_rt_put(sp_ifa->rt);
2957 sp_ifa->rt = NULL;
2958 } else {
2959 continue;
2960 }
2961 }
a881ae1f 2962
57ec0afe 2963 sp_rt = addrconf_dst_alloc(idev, &sp_ifa->addr, false);
25fb6ca4
BK		 2964
2965 /* Failure cases are ignored */
534c8779
G		 2966 if (!IS_ERR(sp_rt)) {
2967 sp_ifa->rt = sp_rt;
25fb6ca4 2968 ip6_ins_rt(sp_rt);
534c8779 2969 }
25fb6ca4
BK		 2970 }
2971 read_unlock_bh(&idev->lock);
2972 }
1da177e4
LT		 2973}
2974
2ad3ed59
AA		 2975void addrconf_add_linklocal(struct inet6_dev *idev,
2976 const struct in6_addr *addr, u32 flags)
1da177e4 2977{
8e5e8f30 2978 struct inet6_ifaddr *ifp;
64236f3f 2979 u32 addr_flags = flags | IFA_F_PERMANENT;
95c385b4
NH		 2980
2981#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2982 if (idev->cnf.optimistic_dad &&
702beb87 2983 !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
95c385b4
NH		 2984 addr_flags |= IFA_F_OPTIMISTIC;
2985#endif
1da177e4 2986
07edd741
HFS		 2987 ifp = ipv6_add_addr(idev, addr, NULL, 64, IFA_LINK, addr_flags,
2988 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
1da177e4 2989 if (!IS_ERR(ifp)) {
46d48046 2990 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
cf22f9a2 2991 addrconf_dad_start(ifp);
1da177e4
LT		 2992 in6_ifa_put(ifp);
2993 }
2994}
2ad3ed59 2995EXPORT_SYMBOL_GPL(addrconf_add_linklocal);
1da177e4 2996
622c81d5
HFS		 2997static bool ipv6_reserved_interfaceid(struct in6_addr address)
2998{
2999 if ((address.s6_addr32[2] | address.s6_addr32[3]) == 0)
3000 return true;
3001
3002 if (address.s6_addr32[2] == htonl(0x02005eff) &&
3003 ((address.s6_addr32[3] & htonl(0xfe000000)) == htonl(0xfe000000)))
3004 return true;
3005
3006 if (address.s6_addr32[2] == htonl(0xfdffffff) &&
3007 ((address.s6_addr32[3] & htonl(0xffffff80)) == htonl(0xffffff80)))
3008 return true;
3009
3010 return false;
3011}
3012
3013static int ipv6_generate_stable_address(struct in6_addr *address,
3014 u8 dad_count,
3015 const struct inet6_dev *idev)
3016{
622c81d5
HFS		 3017 static DEFINE_SPINLOCK(lock);
3018 static __u32 digest[SHA_DIGEST_WORDS];
3019 static __u32 workspace[SHA_WORKSPACE_WORDS];
3020
3021 static union {
3022 char __data[SHA_MESSAGE_BYTES];
3023 struct {
3024 struct in6_addr secret;
ff40217e 3025 __be32 prefix[2];
622c81d5
HFS		 3026 unsigned char hwaddr[MAX_ADDR_LEN];
3027 u8 dad_count;
3028 } __packed;
3029 } data;
3030
3031 struct in6_addr secret;
3032 struct in6_addr temp;
3033 struct net *net = dev_net(idev->dev);
3034
3035 BUILD_BUG_ON(sizeof(data.__data) != sizeof(data));
3036
3037 if (idev->cnf.stable_secret.initialized)
3038 secret = idev->cnf.stable_secret.secret;
3039 else if (net->ipv6.devconf_dflt->stable_secret.initialized)
3040 secret = net->ipv6.devconf_dflt->stable_secret.secret;
3041 else
3042 return -1;
3043
3044retry:
3045 spin_lock_bh(&lock);
3046
3047 sha_init(digest);
3048 memset(&data, 0, sizeof(data));
3049 memset(workspace, 0, sizeof(workspace));
3050 memcpy(data.hwaddr, idev->dev->perm_addr, idev->dev->addr_len);
ff40217e
HFS		 3051 data.prefix[0] = address->s6_addr32[0];
3052 data.prefix[1] = address->s6_addr32[1];
622c81d5
HFS		 3053 data.secret = secret;
3054 data.dad_count = dad_count;
3055
3056 sha_transform(digest, data.__data, workspace);
3057
3058 temp = *address;
ff40217e
HFS		 3059 temp.s6_addr32[2] = (__force __be32)digest[0];
3060 temp.s6_addr32[3] = (__force __be32)digest[1];
622c81d5
HFS		 3061
3062 spin_unlock_bh(&lock);
3063
3064 if (ipv6_reserved_interfaceid(temp)) {
3065 dad_count++;
1855b7c3 3066 if (dad_count > dev_net(idev->dev)->ipv6.sysctl.idgen_retries)
622c81d5
HFS		 3067 return -1;
3068 goto retry;
3069 }
3070
3071 *address = temp;
3072 return 0;
3073}
3074
cc9da6cc
BM		 3075static void ipv6_gen_mode_random_init(struct inet6_dev *idev)
3076{
3077 struct ipv6_stable_secret *s = &idev->cnf.stable_secret;
3078
3079 if (s->initialized)
3080 return;
3081 s = &idev->cnf.stable_secret;
3082 get_random_bytes(&s->secret, sizeof(s->secret));
3083 s->initialized = true;
3084}
3085
bc91b0f0
JP		 3086static void addrconf_addr_gen(struct inet6_dev *idev, bool prefix_route)
3087{
622c81d5
HFS		 3088 struct in6_addr addr;
3089
ca254490
DA		 3090 /* no link local addresses on L3 master devices */
3091 if (netif_is_l3_master(idev->dev))
3092 return;
3093
622c81d5 3094 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
bc91b0f0 3095
cc9da6cc
BM		 3096 switch (idev->addr_gen_mode) {
3097 case IN6_ADDR_GEN_MODE_RANDOM:
3098 ipv6_gen_mode_random_init(idev);
3099 /* fallthrough */
3100 case IN6_ADDR_GEN_MODE_STABLE_PRIVACY:
622c81d5 3101 if (!ipv6_generate_stable_address(&addr, 0, idev))
64236f3f
HFS		 3102 addrconf_add_linklocal(idev, &addr,
3103 IFA_F_STABLE_PRIVACY);
622c81d5
HFS		 3104 else if (prefix_route)
3105 addrconf_prefix_route(&addr, 64, idev->dev, 0, 0);
cc9da6cc
BM		 3106 break;
3107 case IN6_ADDR_GEN_MODE_EUI64:
bc91b0f0
JP		 3108 /* addrconf_add_linklocal also adds a prefix_route and we
3109 * only need to care about prefix routes if ipv6_generate_eui64
3110 * couldn't generate one.
3111 */
3112 if (ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) == 0)
64236f3f 3113 addrconf_add_linklocal(idev, &addr, 0);
bc91b0f0
JP		 3114 else if (prefix_route)
3115 addrconf_prefix_route(&addr, 64, idev->dev, 0, 0);
cc9da6cc
BM		 3116 break;
3117 case IN6_ADDR_GEN_MODE_NONE:
3118 default:
3119 /* will not add any link local address */
3120 break;
bc91b0f0
JP		 3121 }
3122}
3123
1da177e4
LT		 3124static void addrconf_dev_config(struct net_device *dev)
3125{
8e5e8f30 3126 struct inet6_dev *idev;
1da177e4
LT		 3127
3128 ASSERT_RTNL();
3129
74235a25
HX		 3130 if ((dev->type != ARPHRD_ETHER) &&
3131 (dev->type != ARPHRD_FDDI) &&
74235a25 3132 (dev->type != ARPHRD_ARCNET) &&
06a4c1c5 3133 (dev->type != ARPHRD_INFINIBAND) &&
e837735e 3134 (dev->type != ARPHRD_IEEE1394) &&
e74bccb8 3135 (dev->type != ARPHRD_TUNNEL6) &&
cc9da6cc
BM		 3136 (dev->type != ARPHRD_6LOWPAN) &&
3137 (dev->type != ARPHRD_NONE)) {
74235a25
HX		 3138 /* Alas, we support only Ethernet autoconfiguration. */
3139 return;
3140 }
3141
1da177e4 3142 idev = addrconf_add_dev(dev);
64e724f6 3143 if (IS_ERR(idev))
1da177e4
LT		 3144 return;
3145
cc9da6cc
BM		 3146 /* this device type has no EUI support */
3147 if (dev->type == ARPHRD_NONE &&
3148 idev->addr_gen_mode == IN6_ADDR_GEN_MODE_EUI64)
3149 idev->addr_gen_mode = IN6_ADDR_GEN_MODE_RANDOM;
3150
bc91b0f0 3151 addrconf_addr_gen(idev, false);
1da177e4
LT		 3152}
3153
07a93626 3154#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4
LT		 3155static void addrconf_sit_config(struct net_device *dev)
3156{
3157 struct inet6_dev *idev;
3158
3159 ASSERT_RTNL();
3160
1ab1457c
YH		 3161 /*
3162 * Configure the tunnel with one of our IPv4
3163 * addresses... we should configure all of
1da177e4
LT		 3164 * our v4 addrs in the tunnel
3165 */
3166
e5d08d71 3167 idev = ipv6_find_idev(dev);
63159f29 3168 if (!idev) {
91df42be 3169 pr_debug("%s: add_dev failed\n", __func__);
1da177e4
LT		 3170 return;
3171 }
3172
c7dc89c0 3173 if (dev->priv_flags & IFF_ISATAP) {
bc91b0f0 3174 addrconf_addr_gen(idev, false);
c7dc89c0
FT		 3175 return;
3176 }
3177
1da177e4
LT		 3178 sit_add_v4_addrs(idev);
3179
62b54dd9 3180 if (dev->flags&IFF_POINTOPOINT)
1da177e4 3181 addrconf_add_mroute(dev);
1da177e4 3182}
0be669bb 3183#endif
1da177e4 3184
07a93626 3185#if IS_ENABLED(CONFIG_NET_IPGRE)
aee80b54 3186static void addrconf_gre_config(struct net_device *dev)
3187{
3188 struct inet6_dev *idev;
aee80b54 3189
aee80b54 3190 ASSERT_RTNL();
3191
e5d08d71 3192 idev = ipv6_find_idev(dev);
63159f29 3193 if (!idev) {
91df42be 3194 pr_debug("%s: add_dev failed\n", __func__);
aee80b54 3195 return;
3196 }
3197
bc91b0f0 3198 addrconf_addr_gen(idev, true);
d9e4ce65
HFS		 3199 if (dev->flags & IFF_POINTOPOINT)
3200 addrconf_add_mroute(dev);
aee80b54 3201}
3202#endif
3203
f1705ec1
DA		 3204static int fixup_permanent_addr(struct inet6_dev *idev,
3205 struct inet6_ifaddr *ifp)
3206{
3207 if (!ifp->rt) {
3208 struct rt6_info *rt;
3209
3210 rt = addrconf_dst_alloc(idev, &ifp->addr, false);
3211 if (unlikely(IS_ERR(rt)))
3212 return PTR_ERR(rt);
3213
3214 ifp->rt = rt;
3215 }
3216
3217 if (!(ifp->flags & IFA_F_NOPREFIXROUTE)) {
3218 addrconf_prefix_route(&ifp->addr, ifp->prefix_len,
3219 idev->dev, 0, 0);
3220 }
3221
3222 addrconf_dad_start(ifp);
3223
3224 return 0;
3225}
3226
3227static void addrconf_permanent_addr(struct net_device *dev)
3228{
3229 struct inet6_ifaddr *ifp, *tmp;
3230 struct inet6_dev *idev;
3231
3232 idev = __in6_dev_get(dev);
3233 if (!idev)
3234 return;
3235
3236 write_lock_bh(&idev->lock);
3237
3238 list_for_each_entry_safe(ifp, tmp, &idev->addr_list, if_list) {
3239 if ((ifp->flags & IFA_F_PERMANENT) &&
3240 fixup_permanent_addr(idev, ifp) < 0) {
3241 write_unlock_bh(&idev->lock);
3242 ipv6_del_addr(ifp);
3243 write_lock_bh(&idev->lock);
3244
3245 net_info_ratelimited("%s: Failed to add prefix route for address %pI6c; dropping\n",
3246 idev->dev->name, &ifp->addr);
3247 }
3248 }
3249
3250 write_unlock_bh(&idev->lock);
3251}
3252
1ab1457c 3253static int addrconf_notify(struct notifier_block *this, unsigned long event,
351638e7 3254 void *ptr)
1da177e4 3255{
351638e7 3256 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
4f7f34ea 3257 struct netdev_notifier_changeupper_info *info;
748e2d93 3258 struct inet6_dev *idev = __in6_dev_get(dev);
c5e33bdd 3259 int run_pending = 0;
b217d616 3260 int err;
1da177e4 3261
e21e8467 3262 switch (event) {
45ba9dd2 3263 case NETDEV_REGISTER:
74235a25 3264 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
45ba9dd2 3265 idev = ipv6_add_dev(dev);
a317a2f1
WC		 3266 if (IS_ERR(idev))
3267 return notifier_from_errno(PTR_ERR(idev));
45ba9dd2
YH		 3268 }
3269 break;
bcdd553f 3270
b7b0b1d2
AD		 3271 case NETDEV_CHANGEMTU:
3272 /* if MTU under IPV6_MIN_MTU stop IPv6 on this interface. */
3273 if (dev->mtu < IPV6_MIN_MTU) {
3274 addrconf_ifdown(dev, 1);
3275 break;
3276 }
3277
3278 if (idev) {
3279 rt6_mtu_change(dev, dev->mtu);
3280 idev->cnf.mtu6 = dev->mtu;
3281 break;
3282 }
3283
3284 /* allocate new idev */
3285 idev = ipv6_add_dev(dev);
3286 if (IS_ERR(idev))
3287 break;
3288
3289 /* device is still not ready */
3290 if (!(idev->if_flags & IF_READY))
3291 break;
3292
3293 run_pending = 1;
3294
3295 /* fall through */
3296
1da177e4 3297 case NETDEV_UP:
3c21edbd 3298 case NETDEV_CHANGE:
c2edacf8
JV		 3299 if (dev->flags & IFF_SLAVE)
3300 break;
3301
3ce62a84
WC		 3302 if (idev && idev->cnf.disable_ipv6)
3303 break;
3304
3c21edbd 3305 if (event == NETDEV_UP) {
38bd10c4
DA		 3306 /* restore routes for permanent addresses */
3307 addrconf_permanent_addr(dev);
3308
f24e3d65 3309 if (!addrconf_qdisc_ok(dev)) {
3c21edbd 3310 /* device is not ready yet. */
f3213831 3311 pr_info("ADDRCONF(NETDEV_UP): %s: link is not ready\n",
3c21edbd
YH		 3312 dev->name);
3313 break;
3314 }
99081049 3315
d31c7b8f
EP		 3316 if (!idev && dev->mtu >= IPV6_MIN_MTU)
3317 idev = ipv6_add_dev(dev);
3318
a317a2f1 3319 if (!IS_ERR_OR_NULL(idev)) {
99081049 3320 idev->if_flags |= IF_READY;
e3ec6cfc
BT		 3321 run_pending = 1;
3322 }
b7b0b1d2 3323 } else if (event == NETDEV_CHANGE) {
f24e3d65 3324 if (!addrconf_qdisc_ok(dev)) {
3c21edbd
YH		 3325 /* device is still not ready. */
3326 break;
3327 }
3328
3329 if (idev) {
bcdd553f 3330 if (idev->if_flags & IF_READY)
3c21edbd
YH		 3331 /* device is already configured. */
3332 break;
3c21edbd
YH		 3333 idev->if_flags |= IF_READY;
3334 }
3335
f3213831
JP		 3336 pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n",
3337 dev->name);
3c21edbd 3338
c5e33bdd 3339 run_pending = 1;
3c21edbd
YH		 3340 }
3341
e21e8467 3342 switch (dev->type) {
07a93626 3343#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4
LT		 3344 case ARPHRD_SIT:
3345 addrconf_sit_config(dev);
3346 break;
aee80b54 3347#endif
07a93626 3348#if IS_ENABLED(CONFIG_NET_IPGRE)
aee80b54 3349 case ARPHRD_IPGRE:
3350 addrconf_gre_config(dev);
3351 break;
0be669bb 3352#endif
1da177e4
LT		 3353 case ARPHRD_LOOPBACK:
3354 init_loopback(dev);
3355 break;
3356
3357 default:
3358 addrconf_dev_config(dev);
3359 break;
3ff50b79 3360 }
bcdd553f 3361
a317a2f1 3362 if (!IS_ERR_OR_NULL(idev)) {
c5e33bdd
YH		 3363 if (run_pending)
3364 addrconf_dad_run(idev);
3365
bcdd553f
SH		 3366 /*
3367 * If the MTU changed during the interface down,
3368 * when the interface up, the changed MTU must be
3369 * reflected in the idev as well as routers.
1da177e4 3370 */
bcdd553f
SH		 3371 if (idev->cnf.mtu6 != dev->mtu &&
3372 dev->mtu >= IPV6_MIN_MTU) {
1da177e4
LT		 3373 rt6_mtu_change(dev, dev->mtu);
3374 idev->cnf.mtu6 = dev->mtu;
3375 }
3376 idev->tstamp = jiffies;
3377 inet6_ifinfo_notify(RTM_NEWLINK, idev);
bcdd553f
SH		 3378
3379 /*
3380 * If the changed mtu during down is lower than
3381 * IPV6_MIN_MTU stop IPv6 on this interface.
1da177e4
LT		 3382 */
3383 if (dev->mtu < IPV6_MIN_MTU)
bcdd553f 3384 addrconf_ifdown(dev, 1);
1da177e4
LT		 3385 }
3386 break;
3387
1da177e4
LT		 3388 case NETDEV_DOWN:
3389 case NETDEV_UNREGISTER:
3390 /*
3391 * Remove all addresses from this interface.
3392 */
3393 addrconf_ifdown(dev, event != NETDEV_DOWN);
3394 break;
3c21edbd 3395
1da177e4 3396 case NETDEV_CHANGENAME:
1da177e4 3397 if (idev) {
5632c515 3398 snmp6_unregister_dev(idev);
408c4768 3399 addrconf_sysctl_unregister(idev);
a317a2f1 3400 err = addrconf_sysctl_register(idev);
b217d616
HX		 3401 if (err)
3402 return notifier_from_errno(err);
a317a2f1
WC		 3403 err = snmp6_register_dev(idev);
3404 if (err) {
3405 addrconf_sysctl_unregister(idev);
3406 return notifier_from_errno(err);
3407 }
5632c515 3408 }
1da177e4 3409 break;
bcdd553f 3410
93d9b7d7
JP		 3411 case NETDEV_PRE_TYPE_CHANGE:
3412 case NETDEV_POST_TYPE_CHANGE:
3ef0952c
AL		 3413 if (idev)
3414 addrconf_type_change(dev, event);
75c78500 3415 break;
4f7f34ea
DA		 3416
3417 case NETDEV_CHANGEUPPER:
3418 info = ptr;
3419
3420 /* flush all routes if dev is linked to or unlinked from
3421 * an L3 master device (e.g., VRF)
3422 */
3423 if (info->upper_dev && netif_is_l3_master(info->upper_dev))
3424 addrconf_ifdown(dev, 0);
3ff50b79 3425 }
1da177e4
LT		 3426
3427 return NOTIFY_OK;
3428}
3429
3430/*
3431 * addrconf module should be notified of a device going up
3432 */
3433static struct notifier_block ipv6_dev_notf = {
3434 .notifier_call = addrconf_notify,
1da177e4
LT		 3435};
3436
93d9b7d7 3437static void addrconf_type_change(struct net_device *dev, unsigned long event)
75c78500
MS		 3438{
3439 struct inet6_dev *idev;
3440 ASSERT_RTNL();
3441
3442 idev = __in6_dev_get(dev);
3443
93d9b7d7 3444 if (event == NETDEV_POST_TYPE_CHANGE)
75c78500 3445 ipv6_mc_remap(idev);
93d9b7d7 3446 else if (event == NETDEV_PRE_TYPE_CHANGE)
75c78500
MS		 3447 ipv6_mc_unmap(idev);
3448}
3449
70af921d
DA		 3450static bool addr_is_local(const struct in6_addr *addr)
3451{
3452 return ipv6_addr_type(addr) &
3453 (IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK);
3454}
3455
1da177e4
LT		 3456static int addrconf_ifdown(struct net_device *dev, int how)
3457{
c346dca1 3458 struct net *net = dev_net(dev);
502a2ffd 3459 struct inet6_dev *idev;
f1705ec1
DA		 3460 struct inet6_ifaddr *ifa, *tmp;
3461 struct list_head del_list;
3462 int _keep_addr;
3463 bool keep_addr;
73a8bd74 3464 int state, i;
1da177e4
LT		 3465
3466 ASSERT_RTNL();
3467
73a8bd74
DM		 3468 rt6_ifdown(net, dev);
3469 neigh_ifdown(&nd_tbl, dev);
1da177e4
LT		 3470
3471 idev = __in6_dev_get(dev);
63159f29 3472 if (!idev)
1da177e4
LT		 3473 return -ENODEV;
3474
bcdd553f
SH		 3475 /*
3476 * Step 1: remove reference to ipv6 device from parent device.
3477 * Do not dev_put!
1da177e4 3478 */
439e2385 3479 if (how) {
1da177e4 3480 idev->dead = 1;
8814c4b5
YH		 3481
3482 /* protected by rtnl_lock */
a9b3cd7f 3483 RCU_INIT_POINTER(dev->ip6_ptr, NULL);
1da177e4
LT		 3484
3485 /* Step 1.5: remove snmp6 entry */
3486 snmp6_unregister_dev(idev);
3487
3488 }
3489
f1705ec1
DA		 3490 /* aggregate the system setting and interface setting */
3491 _keep_addr = net->ipv6.devconf_all->keep_addr_on_down;
3492 if (!_keep_addr)
3493 _keep_addr = idev->cnf.keep_addr_on_down;
3494
3495 /* combine the user config with event to determine if permanent
3496 * addresses are to be removed from address hash table
3497 */
3498 keep_addr = !(how || _keep_addr <= 0);
3499
73a8bd74
DM		 3500 /* Step 2: clear hash table */
3501 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3502 struct hlist_head *h = &inet6_addr_lst[i];
73a8bd74
DM		 3503
3504 spin_lock_bh(&addrconf_hash_lock);
67ba4152 3505restart:
b67bfe0d 3506 hlist_for_each_entry_rcu(ifa, h, addr_lst) {
73a8bd74 3507 if (ifa->idev == idev) {
c15b1cca 3508 addrconf_del_dad_work(ifa);
f1705ec1
DA		 3509 /* combined flag + permanent flag decide if
3510 * address is retained on a down event
3511 */
3512 if (!keep_addr ||
70af921d
DA		 3513 !(ifa->flags & IFA_F_PERMANENT) ||
3514 addr_is_local(&ifa->addr)) {
f1705ec1
DA		 3515 hlist_del_init_rcu(&ifa->addr_lst);
3516 goto restart;
3517 }
73a8bd74
DM		 3518 }
3519 }
3520 spin_unlock_bh(&addrconf_hash_lock);
3521 }
3522
1da177e4
LT		 3523 write_lock_bh(&idev->lock);
3524
b7b1bfce
HFS		 3525 addrconf_del_rs_timer(idev);
3526
bcdd553f 3527 /* Step 2: clear flags for stateless addrconf */
439e2385 3528 if (!how)
3c21edbd 3529 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
1da177e4 3530
439e2385 3531 if (how && del_timer(&idev->regen_timer))
1da177e4
LT		 3532 in6_dev_put(idev);
3533
bcdd553f 3534 /* Step 3: clear tempaddr list */
372e6c8f 3535 while (!list_empty(&idev->tempaddr_list)) {
3536 ifa = list_first_entry(&idev->tempaddr_list,
3537 struct inet6_ifaddr, tmp_list);
3538 list_del(&ifa->tmp_list);
1da177e4
LT		 3539 write_unlock_bh(&idev->lock);
3540 spin_lock_bh(&ifa->lock);
3541
3542 if (ifa->ifpub) {
3543 in6_ifa_put(ifa->ifpub);
3544 ifa->ifpub = NULL;
3545 }
3546 spin_unlock_bh(&ifa->lock);
3547 in6_ifa_put(ifa);
3548 write_lock_bh(&idev->lock);
3549 }
8f37ada5 3550
f1705ec1
DA		 3551 /* re-combine the user config with event to determine if permanent
3552 * addresses are to be removed from the interface list
3553 */
3554 keep_addr = (!how && _keep_addr > 0);
84e8b803 3555
f1705ec1
DA		 3556 INIT_LIST_HEAD(&del_list);
3557 list_for_each_entry_safe(ifa, tmp, &idev->addr_list, if_list) {
38bd10c4
DA		 3558 struct rt6_info *rt = NULL;
3559
f1705ec1 3560 addrconf_del_dad_work(ifa);
84e8b803 3561
73a8bd74 3562 write_unlock_bh(&idev->lock);
8e8e676d 3563 spin_lock_bh(&ifa->lock);
f1705ec1 3564
70af921d
DA		 3565 if (keep_addr && (ifa->flags & IFA_F_PERMANENT) &&
3566 !addr_is_local(&ifa->addr)) {
f1705ec1
DA		 3567 /* set state to skip the notifier below */
3568 state = INET6_IFADDR_STATE_DEAD;
3569 ifa->state = 0;
3570 if (!(ifa->flags & IFA_F_NODAD))
3571 ifa->flags |= IFA_F_TENTATIVE;
38bd10c4
DA		 3572
3573 rt = ifa->rt;
3574 ifa->rt = NULL;
f1705ec1
DA		 3575 } else {
3576 state = ifa->state;
3577 ifa->state = INET6_IFADDR_STATE_DEAD;
3578
3579 list_del(&ifa->if_list);
3580 list_add(&ifa->if_list, &del_list);
3581 }
3582
8e8e676d 3583 spin_unlock_bh(&ifa->lock);
9d82ca98 3584
38bd10c4
DA		 3585 if (rt)
3586 ip6_del_rt(rt);
3587
73a8bd74
DM		 3588 if (state != INET6_IFADDR_STATE_DEAD) {
3589 __ipv6_ifa_notify(RTM_DELADDR, ifa);
f88c91dd 3590 inet6addr_notifier_call_chain(NETDEV_DOWN, ifa);
27bdb2ab 3591 }
8f37ada5 3592
73a8bd74
DM		 3593 write_lock_bh(&idev->lock);
3594 }
8f37ada5 3595
1da177e4
LT		 3596 write_unlock_bh(&idev->lock);
3597
f1705ec1
DA		 3598 /* now clean up addresses to be removed */
3599 while (!list_empty(&del_list)) {
3600 ifa = list_first_entry(&del_list,
3601 struct inet6_ifaddr, if_list);
3602 list_del(&ifa->if_list);
3603
3604 in6_ifa_put(ifa);
3605 }
3606
381f4dca
SD		 3607 /* Step 5: Discard anycast and multicast list */
3608 if (how) {
3609 ipv6_ac_destroy_dev(idev);
1da177e4 3610 ipv6_mc_destroy_dev(idev);
381f4dca 3611 } else {
1da177e4 3612 ipv6_mc_down(idev);
381f4dca 3613 }
1da177e4 3614
1da177e4 3615 idev->tstamp = jiffies;
1ab1457c 3616
bcdd553f 3617 /* Last: Shot the device (if unregistered) */
439e2385 3618 if (how) {
408c4768 3619 addrconf_sysctl_unregister(idev);
1da177e4
LT		 3620 neigh_parms_release(&nd_tbl, idev->nd_parms);
3621 neigh_ifdown(&nd_tbl, dev);
3622 in6_dev_put(idev);
3623 }
3624 return 0;
3625}
3626
3627static void addrconf_rs_timer(unsigned long data)
3628{
b7b1bfce 3629 struct inet6_dev *idev = (struct inet6_dev *)data;
caf92bc4 3630 struct net_device *dev = idev->dev;
b7b1bfce 3631 struct in6_addr lladdr;
1da177e4 3632
b7b1bfce 3633 write_lock(&idev->lock);
5b2a1953 3634 if (idev->dead || !(idev->if_flags & IF_READY))
1da177e4
LT		 3635 goto out;
3636
9ba2add3 3637 if (!ipv6_accept_ra(idev))
5b2a1953 3638 goto out;
3639
3640 /* Announcement received after solicitation was sent */
3641 if (idev->if_flags & IF_RA_RCVD)
1da177e4 3642 goto out;
1da177e4 3643
b7b1bfce 3644 if (idev->rs_probes++ < idev->cnf.rtr_solicits) {
caf92bc4
CW		 3645 write_unlock(&idev->lock);
3646 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
3647 ndisc_send_rs(dev, &lladdr,
b7b1bfce
HFS		 3648 &in6addr_linklocal_allrouters);
3649 else
caf92bc4 3650 goto put;
1da177e4 3651
caf92bc4 3652 write_lock(&idev->lock);
b7b1bfce
HFS		 3653 /* The wait after the last probe can be shorter */
3654 addrconf_mod_rs_timer(idev, (idev->rs_probes ==
3655 idev->cnf.rtr_solicits) ?
3656 idev->cnf.rtr_solicit_delay :
3657 idev->cnf.rtr_solicit_interval);
1da177e4 3658 } else {
1da177e4
LT		 3659 /*
3660 * Note: we do not support deprecated "all on-link"
3661 * assumption any longer.
3662 */
91df42be 3663 pr_debug("%s: no IPv6 routers present\n", idev->dev->name);
1da177e4
LT		 3664 }
3665
3666out:
b7b1bfce 3667 write_unlock(&idev->lock);
caf92bc4 3668put:
b7b1bfce 3669 in6_dev_put(idev);
1da177e4
LT		 3670}
3671
3672/*
3673 * Duplicate Address Detection
3674 */
3c21edbd
YH		 3675static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
3676{
3677 unsigned long rand_num;
3678 struct inet6_dev *idev = ifp->idev;
3679
95c385b4
NH		 3680 if (ifp->flags & IFA_F_OPTIMISTIC)
3681 rand_num = 0;
3682 else
63862b5b 3683 rand_num = prandom_u32() % (idev->cnf.rtr_solicit_delay ? : 1);
95c385b4 3684
b7b1bfce 3685 ifp->dad_probes = idev->cnf.dad_transmits;
c15b1cca 3686 addrconf_mod_dad_work(ifp, rand_num);
3c21edbd
YH		 3687}
3688
c15b1cca 3689static void addrconf_dad_begin(struct inet6_ifaddr *ifp)
1da177e4
LT		 3690{
3691 struct inet6_dev *idev = ifp->idev;
3692 struct net_device *dev = idev->dev;
16186a82 3693 bool notify = false;
1da177e4
LT		 3694
3695 addrconf_join_solict(dev, &ifp->addr);
3696
63862b5b 3697 prandom_seed((__force u32) ifp->addr.s6_addr32[3]);
1da177e4
LT		 3698
3699 read_lock_bh(&idev->lock);
622ccdf1 3700 spin_lock(&ifp->lock);
e9d3e084 3701 if (ifp->state == INET6_IFADDR_STATE_DEAD)
1da177e4 3702 goto out;
1da177e4
LT		 3703
3704 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
1b34be74 3705 idev->cnf.accept_dad < 1 ||
55ebaef1
NT		 3706 !(ifp->flags&IFA_F_TENTATIVE) ||
3707 ifp->flags & IFA_F_NODAD) {
cc411d0b 3708 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
21809faf 3709 spin_unlock(&ifp->lock);
1da177e4
LT		 3710 read_unlock_bh(&idev->lock);
3711
3712 addrconf_dad_completed(ifp);
3713 return;
3714 }
3715
6732bade 3716 if (!(idev->if_flags & IF_READY)) {
21809faf 3717 spin_unlock(&ifp->lock);
6732bade 3718 read_unlock_bh(&idev->lock);
3c21edbd 3719 /*
590a9887 3720 * If the device is not ready:
3c21edbd
YH		 3721 * - keep it tentative if it is a permanent address.
3722 * - otherwise, kill it.
3723 */
3724 in6_ifa_hold(ifp);
cc411d0b 3725 addrconf_dad_stop(ifp, 0);
6732bade 3726 return;
3c21edbd 3727 }
95c385b4
NH		 3728
3729 /*
3730 * Optimistic nodes can start receiving
3731 * Frames right away
3732 */
7fd2561e 3733 if (ifp->flags & IFA_F_OPTIMISTIC) {
95c385b4 3734 ip6_ins_rt(ifp->rt);
7fd2561e
EK		 3735 if (ipv6_use_optimistic_addr(idev)) {
3736 /* Because optimistic nodes can use this address,
3737 * notify listeners. If DAD fails, RTM_DELADDR is sent.
3738 */
16186a82 3739 notify = true;
7fd2561e
EK		 3740 }
3741 }
95c385b4 3742
6732bade 3743 addrconf_dad_kick(ifp);
1da177e4 3744out:
622ccdf1 3745 spin_unlock(&ifp->lock);
1da177e4 3746 read_unlock_bh(&idev->lock);
16186a82
SAK		 3747 if (notify)
3748 ipv6_ifa_notify(RTM_NEWADDR, ifp);
1da177e4
LT		 3749}
3750
c15b1cca 3751static void addrconf_dad_start(struct inet6_ifaddr *ifp)
1da177e4 3752{
c15b1cca
HFS		 3753 bool begin_dad = false;
3754
8e8e676d 3755 spin_lock_bh(&ifp->lock);
c15b1cca
HFS		 3756 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
3757 ifp->state = INET6_IFADDR_STATE_PREDAD;
3758 begin_dad = true;
3759 }
8e8e676d 3760 spin_unlock_bh(&ifp->lock);
c15b1cca
HFS		 3761
3762 if (begin_dad)
3763 addrconf_mod_dad_work(ifp, 0);
3764}
3765
3766static void addrconf_dad_work(struct work_struct *w)
3767{
3768 struct inet6_ifaddr *ifp = container_of(to_delayed_work(w),
3769 struct inet6_ifaddr,
3770 dad_work);
1da177e4 3771 struct inet6_dev *idev = ifp->idev;
1da177e4
LT		 3772 struct in6_addr mcaddr;
3773
c15b1cca
HFS		 3774 enum {
3775 DAD_PROCESS,
3776 DAD_BEGIN,
3777 DAD_ABORT,
3778 } action = DAD_PROCESS;
3779
3780 rtnl_lock();
3781
8e8e676d 3782 spin_lock_bh(&ifp->lock);
c15b1cca
HFS		 3783 if (ifp->state == INET6_IFADDR_STATE_PREDAD) {
3784 action = DAD_BEGIN;
3785 ifp->state = INET6_IFADDR_STATE_DAD;
3786 } else if (ifp->state == INET6_IFADDR_STATE_ERRDAD) {
3787 action = DAD_ABORT;
3788 ifp->state = INET6_IFADDR_STATE_POSTDAD;
3789 }
8e8e676d 3790 spin_unlock_bh(&ifp->lock);
c15b1cca
HFS		 3791
3792 if (action == DAD_BEGIN) {
3793 addrconf_dad_begin(ifp);
3794 goto out;
3795 } else if (action == DAD_ABORT) {
3796 addrconf_dad_stop(ifp, 1);
3797 goto out;
3798 }
3799
b7b1bfce 3800 if (!ifp->dad_probes && addrconf_dad_end(ifp))
f2344a13
HX		 3801 goto out;
3802
c15b1cca 3803 write_lock_bh(&idev->lock);
122e4519 3804 if (idev->dead || !(idev->if_flags & IF_READY)) {
c15b1cca 3805 write_unlock_bh(&idev->lock);
1da177e4
LT		 3806 goto out;
3807 }
21809faf 3808
3809 spin_lock(&ifp->lock);
622ccdf1
HX		 3810 if (ifp->state == INET6_IFADDR_STATE_DEAD) {
3811 spin_unlock(&ifp->lock);
c15b1cca 3812 write_unlock_bh(&idev->lock);
622ccdf1
HX		 3813 goto out;
3814 }
3815
b7b1bfce 3816 if (ifp->dad_probes == 0) {
1da177e4
LT		 3817 /*
3818 * DAD was successful
3819 */
3820
cc411d0b 3821 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
21809faf 3822 spin_unlock(&ifp->lock);
c15b1cca 3823 write_unlock_bh(&idev->lock);
1da177e4
LT		 3824
3825 addrconf_dad_completed(ifp);
3826
3827 goto out;
3828 }
3829
b7b1bfce 3830 ifp->dad_probes--;
c15b1cca
HFS		 3831 addrconf_mod_dad_work(ifp,
3832 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME));
21809faf 3833 spin_unlock(&ifp->lock);
c15b1cca 3834 write_unlock_bh(&idev->lock);
1da177e4
LT		 3835
3836 /* send a neighbour solicitation for our addr */
1da177e4 3837 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
304d888b 3838 ndisc_send_ns(ifp->idev->dev, &ifp->addr, &mcaddr, &in6addr_any);
1da177e4
LT		 3839out:
3840 in6_ifa_put(ifp);
c15b1cca 3841 rtnl_unlock();
1da177e4
LT		 3842}
3843
11ffff75
HFS		 3844/* ifp->idev must be at least read locked */
3845static bool ipv6_lonely_lladdr(struct inet6_ifaddr *ifp)
3846{
3847 struct inet6_ifaddr *ifpiter;
3848 struct inet6_dev *idev = ifp->idev;
3849
602582ca
HFS		 3850 list_for_each_entry_reverse(ifpiter, &idev->addr_list, if_list) {
3851 if (ifpiter->scope > IFA_LINK)
3852 break;
11ffff75
HFS		 3853 if (ifp != ifpiter && ifpiter->scope == IFA_LINK &&
3854 (ifpiter->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE|
3855 IFA_F_OPTIMISTIC|IFA_F_DADFAILED)) ==
3856 IFA_F_PERMANENT)
3857 return false;
3858 }
3859 return true;
3860}
3861
1da177e4
LT		 3862static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
3863{
e21e8467 3864 struct net_device *dev = ifp->idev->dev;
b7b1bfce 3865 struct in6_addr lladdr;
b173ee48 3866 bool send_rs, send_mld;
b7b1bfce 3867
c15b1cca 3868 addrconf_del_dad_work(ifp);
1da177e4
LT		 3869
3870 /*
3871 * Configure the address for reception. Now it is valid.
3872 */
3873
3874 ipv6_ifa_notify(RTM_NEWADDR, ifp);
3875
026359bc
TA		 3876 /* If added prefix is link local and we are prepared to process
3877 router advertisements, start sending router solicitations.
1da177e4
LT		 3878 */
3879
1ec047eb 3880 read_lock_bh(&ifp->idev->lock);
11ffff75 3881 send_mld = ifp->scope == IFA_LINK && ipv6_lonely_lladdr(ifp);
b173ee48
HFS		 3882 send_rs = send_mld &&
3883 ipv6_accept_ra(ifp->idev) &&
1ec047eb 3884 ifp->idev->cnf.rtr_solicits > 0 &&
b173ee48 3885 (dev->flags&IFF_LOOPBACK) == 0;
1ec047eb
HFS		 3886 read_unlock_bh(&ifp->idev->lock);
3887
b173ee48
HFS		 3888 /* While dad is in progress mld report's source address is in6_addrany.
3889 * Resend with proper ll now.
3890 */
3891 if (send_mld)
3892 ipv6_mc_dad_complete(ifp->idev);
3893
1ec047eb 3894 if (send_rs) {
1da177e4
LT		 3895 /*
3896 * If a host as already performed a random delay
3897 * [...] as part of DAD [...] there is no need
3898 * to delay again before sending the first RS
3899 */
1ec047eb 3900 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
b7b1bfce 3901 return;
1ec047eb 3902 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters);
1da177e4 3903
b7b1bfce
HFS		 3904 write_lock_bh(&ifp->idev->lock);
3905 spin_lock(&ifp->lock);
3906 ifp->idev->rs_probes = 1;
1da177e4 3907 ifp->idev->if_flags |= IF_RS_SENT;
b7b1bfce
HFS		 3908 addrconf_mod_rs_timer(ifp->idev,
3909 ifp->idev->cnf.rtr_solicit_interval);
3910 spin_unlock(&ifp->lock);
3911 write_unlock_bh(&ifp->idev->lock);
1da177e4
LT		 3912 }
3913}
3914
e21e8467
SH		 3915static void addrconf_dad_run(struct inet6_dev *idev)
3916{
c5e33bdd
YH		 3917 struct inet6_ifaddr *ifp;
3918
3919 read_lock_bh(&idev->lock);
502a2ffd 3920 list_for_each_entry(ifp, &idev->addr_list, if_list) {
21809faf 3921 spin_lock(&ifp->lock);
f2344a13
HX		 3922 if (ifp->flags & IFA_F_TENTATIVE &&
3923 ifp->state == INET6_IFADDR_STATE_DAD)
3924 addrconf_dad_kick(ifp);
21809faf 3925 spin_unlock(&ifp->lock);
c5e33bdd
YH		 3926 }
3927 read_unlock_bh(&idev->lock);
3928}
3929
1da177e4
LT		 3930#ifdef CONFIG_PROC_FS
3931struct if6_iter_state {
3c40090a 3932 struct seq_net_private p;
1da177e4 3933 int bucket;
1d578303 3934 int offset;
1da177e4
LT		 3935};
3936
1d578303 3937static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos)
1da177e4
LT		 3938{
3939 struct inet6_ifaddr *ifa = NULL;
3940 struct if6_iter_state *state = seq->private;
1218854a 3941 struct net *net = seq_file_net(seq);
1d578303 3942 int p = 0;
1da177e4 3943
1d578303
MM		 3944 /* initial bucket if pos is 0 */
3945 if (pos == 0) {
3946 state->bucket = 0;
3947 state->offset = 0;
3948 }
3949
3950 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
b67bfe0d 3951 hlist_for_each_entry_rcu_bh(ifa, &inet6_addr_lst[state->bucket],
1d578303 3952 addr_lst) {
9f0d3c27
ED		 3953 if (!net_eq(dev_net(ifa->idev->dev), net))
3954 continue;
1d578303
MM		 3955 /* sync with offset */
3956 if (p < state->offset) {
3957 p++;
3958 continue;
3959 }
3960 state->offset++;
9f0d3c27 3961 return ifa;
1d578303
MM		 3962 }
3963
3964 /* prepare for next bucket */
3965 state->offset = 0;
3966 p = 0;
1da177e4 3967 }
c2e21293 3968 return NULL;
1da177e4
LT		 3969}
3970
c2e21293 3971static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
3972 struct inet6_ifaddr *ifa)
1da177e4
LT		 3973{
3974 struct if6_iter_state *state = seq->private;
1218854a 3975 struct net *net = seq_file_net(seq);
1da177e4 3976
b67bfe0d 3977 hlist_for_each_entry_continue_rcu_bh(ifa, addr_lst) {
9f0d3c27
ED		 3978 if (!net_eq(dev_net(ifa->idev->dev), net))
3979 continue;
1d578303 3980 state->offset++;
9f0d3c27 3981 return ifa;
1d578303 3982 }
3c40090a 3983
c2e21293 3984 while (++state->bucket < IN6_ADDR_HSIZE) {
1d578303 3985 state->offset = 0;
b67bfe0d 3986 hlist_for_each_entry_rcu_bh(ifa,
c2e21293 3987 &inet6_addr_lst[state->bucket], addr_lst) {
9f0d3c27
ED		 3988 if (!net_eq(dev_net(ifa->idev->dev), net))
3989 continue;
1d578303 3990 state->offset++;
9f0d3c27 3991 return ifa;
c2e21293 3992 }
1da177e4 3993 }
3c40090a 3994
c2e21293 3995 return NULL;
1da177e4
LT		 3996}
3997
1da177e4 3998static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
4f70ecca 3999 __acquires(rcu_bh)
1da177e4 4000{
5c578aed 4001 rcu_read_lock_bh();
1d578303 4002 return if6_get_first(seq, *pos);
1da177e4
LT		 4003}
4004
4005static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
4006{
4007 struct inet6_ifaddr *ifa;
4008
4009 ifa = if6_get_next(seq, v);
4010 ++*pos;
4011 return ifa;
4012}
4013
4014static void if6_seq_stop(struct seq_file *seq, void *v)
4f70ecca 4015 __releases(rcu_bh)
1da177e4 4016{
5c578aed 4017 rcu_read_unlock_bh();
1da177e4
LT		 4018}
4019
4020static int if6_seq_show(struct seq_file *seq, void *v)
4021{
4022 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
971a351c 4023 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
b071195d 4024 &ifp->addr,
1da177e4
LT		 4025 ifp->idev->dev->ifindex,
4026 ifp->prefix_len,
4027 ifp->scope,
971a351c 4028 (u8) ifp->flags,
1da177e4
LT		 4029 ifp->idev->dev->name);
4030 return 0;
4031}
4032
56b3d975 4033static const struct seq_operations if6_seq_ops = {
1da177e4
LT		 4034 .start = if6_seq_start,
4035 .next = if6_seq_next,
4036 .show = if6_seq_show,
4037 .stop = if6_seq_stop,
4038};
4039
4040static int if6_seq_open(struct inode *inode, struct file *file)
4041{
3c40090a
DL		 4042 return seq_open_net(inode, file, &if6_seq_ops,
4043 sizeof(struct if6_iter_state));
1da177e4
LT		 4044}
4045
9a32144e 4046static const struct file_operations if6_fops = {
1da177e4
LT		 4047 .owner = THIS_MODULE,
4048 .open = if6_seq_open,
4049 .read = seq_read,
4050 .llseek = seq_lseek,
3c40090a 4051 .release = seq_release_net,
1da177e4
LT		 4052};
4053
2c8c1e72 4054static int __net_init if6_proc_net_init(struct net *net)
1da177e4 4055{
d4beaa66 4056 if (!proc_create("if_inet6", S_IRUGO, net->proc_net, &if6_fops))
1da177e4
LT		 4057 return -ENOMEM;
4058 return 0;
4059}
4060
2c8c1e72 4061static void __net_exit if6_proc_net_exit(struct net *net)
3c40090a 4062{
ece31ffd 4063 remove_proc_entry("if_inet6", net->proc_net);
3c40090a
DL		 4064}
4065
4066static struct pernet_operations if6_proc_net_ops = {
67ba4152
IM		 4067 .init = if6_proc_net_init,
4068 .exit = if6_proc_net_exit,
3c40090a
DL		 4069};
4070
4071int __init if6_proc_init(void)
4072{
4073 return register_pernet_subsys(&if6_proc_net_ops);
4074}
4075
1da177e4
LT		 4076void if6_proc_exit(void)
4077{
3c40090a 4078 unregister_pernet_subsys(&if6_proc_net_ops);
1da177e4
LT		 4079}
4080#endif /* CONFIG_PROC_FS */
4081
07a93626 4082#if IS_ENABLED(CONFIG_IPV6_MIP6)
3b9f9a1c 4083/* Check if address is a home address configured on any interface. */
b71d1d42 4084int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr)
3b9f9a1c
NT		 4085{
4086 int ret = 0;
c2e21293 4087 struct inet6_ifaddr *ifp = NULL;
ddbe5032 4088 unsigned int hash = inet6_addr_hash(addr);
c2e21293 4089
5c578aed 4090 rcu_read_lock_bh();
b67bfe0d 4091 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
878628fb 4092 if (!net_eq(dev_net(ifp->idev->dev), net))
389f6612 4093 continue;
caad295f 4094 if (ipv6_addr_equal(&ifp->addr, addr) &&
3b9f9a1c
NT		 4095 (ifp->flags & IFA_F_HOMEADDRESS)) {
4096 ret = 1;
4097 break;
4098 }
4099 }
5c578aed 4100 rcu_read_unlock_bh();
3b9f9a1c
NT		 4101 return ret;
4102}
4103#endif
4104
1da177e4
LT		 4105/*
4106 * Periodic address status verification
4107 */
4108
c15b1cca 4109static void addrconf_verify_rtnl(void)
1da177e4 4110{
b2db7564 4111 unsigned long now, next, next_sec, next_sched;
1da177e4 4112 struct inet6_ifaddr *ifp;
1da177e4
LT		 4113 int i;
4114
c15b1cca
HFS		 4115 ASSERT_RTNL();
4116
5c578aed 4117 rcu_read_lock_bh();
1da177e4 4118 now = jiffies;
b2db7564 4119 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
1da177e4 4120
c15b1cca 4121 cancel_delayed_work(&addr_chk_work);
1da177e4 4122
bcdd553f 4123 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
1da177e4 4124restart:
c15b1cca 4125 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[i], addr_lst) {
1da177e4 4126 unsigned long age;
1da177e4 4127
fad8da3e
YA		 4128 /* When setting preferred_lft to a value not zero or
4129 * infinity, while valid_lft is infinity
4130 * IFA_F_PERMANENT has a non-infinity life time.
4131 */
4132 if ((ifp->flags & IFA_F_PERMANENT) &&
4133 (ifp->prefered_lft == INFINITY_LIFE_TIME))
1da177e4
LT		 4134 continue;
4135
4136 spin_lock(&ifp->lock);
b2db7564
YH		 4137 /* We try to batch several events at once. */
4138 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
1da177e4 4139
8f27ebb9
YH		 4140 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
4141 age >= ifp->valid_lft) {
1da177e4
LT		 4142 spin_unlock(&ifp->lock);
4143 in6_ifa_hold(ifp);
1da177e4
LT		 4144 ipv6_del_addr(ifp);
4145 goto restart;
8f27ebb9
YH		 4146 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
4147 spin_unlock(&ifp->lock);
4148 continue;
1da177e4 4149 } else if (age >= ifp->prefered_lft) {
a1ed0526 4150 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
1da177e4
LT		 4151 int deprecate = 0;
4152
4153 if (!(ifp->flags&IFA_F_DEPRECATED)) {
4154 deprecate = 1;
4155 ifp->flags |= IFA_F_DEPRECATED;
4156 }
4157
fad8da3e
YA		 4158 if ((ifp->valid_lft != INFINITY_LIFE_TIME) &&
4159 (time_before(ifp->tstamp + ifp->valid_lft * HZ, next)))
1da177e4
LT		 4160 next = ifp->tstamp + ifp->valid_lft * HZ;
4161
4162 spin_unlock(&ifp->lock);
4163
4164 if (deprecate) {
4165 in6_ifa_hold(ifp);
1da177e4
LT		 4166
4167 ipv6_ifa_notify(0, ifp);
4168 in6_ifa_put(ifp);
4169 goto restart;
4170 }
1da177e4
LT		 4171 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
4172 !(ifp->flags&IFA_F_TENTATIVE)) {
88949cf4 4173 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
4174 ifp->idev->cnf.dad_transmits *
1f9248e5 4175 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME) / HZ;
88949cf4 4176
1da177e4
LT		 4177 if (age >= ifp->prefered_lft - regen_advance) {
4178 struct inet6_ifaddr *ifpub = ifp->ifpub;
4179 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
4180 next = ifp->tstamp + ifp->prefered_lft * HZ;
4181 if (!ifp->regen_count && ifpub) {
4182 ifp->regen_count++;
4183 in6_ifa_hold(ifp);
4184 in6_ifa_hold(ifpub);
4185 spin_unlock(&ifp->lock);
5c578aed 4186
291d809b
HY		 4187 spin_lock(&ifpub->lock);
4188 ifpub->regen_count = 0;
4189 spin_unlock(&ifpub->lock);
1da177e4
LT		 4190 ipv6_create_tempaddr(ifpub, ifp);
4191 in6_ifa_put(ifpub);
4192 in6_ifa_put(ifp);
4193 goto restart;
4194 }
4195 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
4196 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
4197 spin_unlock(&ifp->lock);
1da177e4
LT		 4198 } else {
4199 /* ifp->prefered_lft <= ifp->valid_lft */
4200 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
4201 next = ifp->tstamp + ifp->prefered_lft * HZ;
4202 spin_unlock(&ifp->lock);
4203 }
4204 }
1da177e4
LT		 4205 }
4206
b2db7564
YH		 4207 next_sec = round_jiffies_up(next);
4208 next_sched = next;
4209
4210 /* If rounded timeout is accurate enough, accept it. */
4211 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
4212 next_sched = next_sec;
4213
4214 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
4215 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
4216 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
4217
ba3542e1 4218 ADBG(KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
4219 now, next, next_sec, next_sched);
c15b1cca 4220 mod_delayed_work(addrconf_wq, &addr_chk_work, next_sched - now);
5c578aed 4221 rcu_read_unlock_bh();
1da177e4
LT		 4222}
4223
c15b1cca
HFS		 4224static void addrconf_verify_work(struct work_struct *w)
4225{
4226 rtnl_lock();
4227 addrconf_verify_rtnl();
4228 rtnl_unlock();
4229}
4230
4231static void addrconf_verify(void)
4232{
4233 mod_delayed_work(addrconf_wq, &addr_chk_work, 0);
4234}
4235
caeaba79
ND		 4236static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local,
4237 struct in6_addr **peer_pfx)
461d8837
TG		 4238{
4239 struct in6_addr *pfx = NULL;
4240
caeaba79
ND		 4241 *peer_pfx = NULL;
4242
461d8837
TG		 4243 if (addr)
4244 pfx = nla_data(addr);
4245
4246 if (local) {
4247 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
caeaba79
ND		 4248 *peer_pfx = pfx;
4249 pfx = nla_data(local);
461d8837
TG		 4250 }
4251
4252 return pfx;
4253}
4254
ef7c79ed 4255static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
461d8837
TG		 4256 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
4257 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
4258 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
479840ff 4259 [IFA_FLAGS] = { .len = sizeof(u32) },
461d8837
TG		 4260};
4261
1da177e4 4262static int
661d2967 4263inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh)
1da177e4 4264{
3b1e0a65 4265 struct net *net = sock_net(skb->sk);
b933f716
TG		 4266 struct ifaddrmsg *ifm;
4267 struct nlattr *tb[IFA_MAX+1];
caeaba79 4268 struct in6_addr *pfx, *peer_pfx;
6046d5b4 4269 u32 ifa_flags;
b933f716 4270 int err;
1da177e4 4271
b933f716
TG		 4272 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
4273 if (err < 0)
4274 return err;
4275
4276 ifm = nlmsg_data(nlh);
caeaba79 4277 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
63159f29 4278 if (!pfx)
1da177e4
LT		 4279 return -EINVAL;
4280
6046d5b4
HK		 4281 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
4282
4283 /* We ignore other flags so far. */
4284 ifa_flags &= IFA_F_MANAGETEMPADDR;
4285
4286 return inet6_addr_del(net, ifm->ifa_index, ifa_flags, pfx,
4287 ifm->ifa_prefixlen);
1da177e4
LT		 4288}
4289
479840ff 4290static int inet6_addr_modify(struct inet6_ifaddr *ifp, u32 ifa_flags,
55ebaef1 4291 u32 prefered_lft, u32 valid_lft)
081bba5b 4292{
6f704992
YH		 4293 u32 flags;
4294 clock_t expires;
4bed72e4 4295 unsigned long timeout;
53bd6749 4296 bool was_managetempaddr;
5b84efec 4297 bool had_prefixroute;
46d48046 4298
c15b1cca
HFS		 4299 ASSERT_RTNL();
4300
081bba5b
NT		 4301 if (!valid_lft || (prefered_lft > valid_lft))
4302 return -EINVAL;
4303
53bd6749
JP		 4304 if (ifa_flags & IFA_F_MANAGETEMPADDR &&
4305 (ifp->flags & IFA_F_TEMPORARY || ifp->prefix_len != 64))
4306 return -EINVAL;
4307
4bed72e4
YH		 4308 timeout = addrconf_timeout_fixup(valid_lft, HZ);
4309 if (addrconf_finite_timeout(timeout)) {
4310 expires = jiffies_to_clock_t(timeout * HZ);
4311 valid_lft = timeout;
6f704992 4312 flags = RTF_EXPIRES;
4bed72e4
YH		 4313 } else {
4314 expires = 0;
4315 flags = 0;
4316 ifa_flags |= IFA_F_PERMANENT;
6f704992 4317 }
081bba5b 4318
4bed72e4
YH		 4319 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
4320 if (addrconf_finite_timeout(timeout)) {
4321 if (timeout == 0)
4322 ifa_flags |= IFA_F_DEPRECATED;
4323 prefered_lft = timeout;
4324 }
081bba5b
NT		 4325
4326 spin_lock_bh(&ifp->lock);
53bd6749 4327 was_managetempaddr = ifp->flags & IFA_F_MANAGETEMPADDR;
5b84efec
TH		 4328 had_prefixroute = ifp->flags & IFA_F_PERMANENT &&
4329 !(ifp->flags & IFA_F_NOPREFIXROUTE);
53bd6749 4330 ifp->flags &= ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD |
761aac73
TH		 4331 IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
4332 IFA_F_NOPREFIXROUTE);
53bd6749 4333 ifp->flags |= ifa_flags;
081bba5b
NT		 4334 ifp->tstamp = jiffies;
4335 ifp->valid_lft = valid_lft;
4336 ifp->prefered_lft = prefered_lft;
4337
4338 spin_unlock_bh(&ifp->lock);
4339 if (!(ifp->flags&IFA_F_TENTATIVE))
4340 ipv6_ifa_notify(0, ifp);
081bba5b 4341
761aac73
TH		 4342 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) {
4343 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
4344 expires, flags);
5b84efec
TH		 4345 } else if (had_prefixroute) {
4346 enum cleanup_prefix_rt_t action;
4347 unsigned long rt_expires;
4348
4349 write_lock_bh(&ifp->idev->lock);
4350 action = check_cleanup_prefix_route(ifp, &rt_expires);
4351 write_unlock_bh(&ifp->idev->lock);
4352
4353 if (action != CLEANUP_PREFIX_RT_NOP) {
4354 cleanup_prefix_route(ifp, rt_expires,
4355 action == CLEANUP_PREFIX_RT_DEL);
4356 }
761aac73 4357 }
53bd6749
JP		 4358
4359 if (was_managetempaddr || ifp->flags & IFA_F_MANAGETEMPADDR) {
4360 if (was_managetempaddr && !(ifp->flags & IFA_F_MANAGETEMPADDR))
4361 valid_lft = prefered_lft = 0;
4362 manage_tempaddrs(ifp->idev, ifp, valid_lft, prefered_lft,
4363 !was_managetempaddr, jiffies);
4364 }
4365
c15b1cca 4366 addrconf_verify_rtnl();
081bba5b
NT		 4367
4368 return 0;
4369}
4370
1da177e4 4371static int
661d2967 4372inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh)
1da177e4 4373{
3b1e0a65 4374 struct net *net = sock_net(skb->sk);
461d8837
TG		 4375 struct ifaddrmsg *ifm;
4376 struct nlattr *tb[IFA_MAX+1];
caeaba79 4377 struct in6_addr *pfx, *peer_pfx;
7198f8ce
TG		 4378 struct inet6_ifaddr *ifa;
4379 struct net_device *dev;
55ebaef1 4380 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
479840ff 4381 u32 ifa_flags;
461d8837 4382 int err;
1da177e4 4383
461d8837
TG		 4384 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
4385 if (err < 0)
4386 return err;
4387
4388 ifm = nlmsg_data(nlh);
caeaba79 4389 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
63159f29 4390 if (!pfx)
1da177e4
LT		 4391 return -EINVAL;
4392
461d8837 4393 if (tb[IFA_CACHEINFO]) {
0778769d 4394 struct ifa_cacheinfo *ci;
461d8837
TG		 4395
4396 ci = nla_data(tb[IFA_CACHEINFO]);
0778769d 4397 valid_lft = ci->ifa_valid;
461d8837
TG		 4398 preferred_lft = ci->ifa_prefered;
4399 } else {
4400 preferred_lft = INFINITY_LIFE_TIME;
4401 valid_lft = INFINITY_LIFE_TIME;
0778769d
NT		 4402 }
4403
af284937 4404 dev = __dev_get_by_index(net, ifm->ifa_index);
63159f29 4405 if (!dev)
7198f8ce
TG		 4406 return -ENODEV;
4407
479840ff
JP		 4408 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
4409
55ebaef1 4410 /* We ignore other flags so far. */
761aac73 4411 ifa_flags &= IFA_F_NODAD | IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
93a714d6 4412 IFA_F_NOPREFIXROUTE | IFA_F_MCAUTOJOIN;
55ebaef1 4413
1cab3da6 4414 ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
63159f29 4415 if (!ifa) {
7198f8ce
TG		 4416 /*
4417 * It would be best to check for !NLM_F_CREATE here but
db9c7c39 4418 * userspace already relies on not having to provide this.
7198f8ce 4419 */
caeaba79 4420 return inet6_addr_add(net, ifm->ifa_index, pfx, peer_pfx,
af284937
DL		 4421 ifm->ifa_prefixlen, ifa_flags,
4422 preferred_lft, valid_lft);
081bba5b
NT		 4423 }
4424
7198f8ce
TG		 4425 if (nlh->nlmsg_flags & NLM_F_EXCL ||
4426 !(nlh->nlmsg_flags & NLM_F_REPLACE))
4427 err = -EEXIST;
4428 else
55ebaef1 4429 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
7198f8ce
TG		 4430
4431 in6_ifa_put(ifa);
4432
4433 return err;
1da177e4
LT		 4434}
4435
479840ff 4436static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u32 flags,
101bb229
TG		 4437 u8 scope, int ifindex)
4438{
4439 struct ifaddrmsg *ifm;
4440
4441 ifm = nlmsg_data(nlh);
4442 ifm->ifa_family = AF_INET6;
4443 ifm->ifa_prefixlen = prefixlen;
4444 ifm->ifa_flags = flags;
4445 ifm->ifa_scope = scope;
4446 ifm->ifa_index = ifindex;
4447}
4448
85486af0
TG		 4449static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
4450 unsigned long tstamp, u32 preferred, u32 valid)
4451{
4452 struct ifa_cacheinfo ci;
4453
18a31e1e
TG		 4454 ci.cstamp = cstamp_delta(cstamp);
4455 ci.tstamp = cstamp_delta(tstamp);
85486af0
TG		 4456 ci.ifa_prefered = preferred;
4457 ci.ifa_valid = valid;
4458
4459 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
4460}
4461
101bb229
TG		 4462static inline int rt_scope(int ifa_scope)
4463{
4464 if (ifa_scope & IFA_HOST)
4465 return RT_SCOPE_HOST;
4466 else if (ifa_scope & IFA_LINK)
4467 return RT_SCOPE_LINK;
4468 else if (ifa_scope & IFA_SITE)
4469 return RT_SCOPE_SITE;
4470 else
4471 return RT_SCOPE_UNIVERSE;
4472}
4473
0ab6803b
TG		 4474static inline int inet6_ifaddr_msgsize(void)
4475{
339bf98f 4476 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
caeaba79 4477 + nla_total_size(16) /* IFA_LOCAL */
339bf98f 4478 + nla_total_size(16) /* IFA_ADDRESS */
479840ff
JP		 4479 + nla_total_size(sizeof(struct ifa_cacheinfo))
4480 + nla_total_size(4) /* IFA_FLAGS */;
0ab6803b 4481}
c5396a31 4482
1da177e4 4483static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
15e47304 4484 u32 portid, u32 seq, int event, unsigned int flags)
1da177e4 4485{
1da177e4 4486 struct nlmsghdr *nlh;
85486af0 4487 u32 preferred, valid;
1da177e4 4488
15e47304 4489 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
63159f29 4490 if (!nlh)
26932566 4491 return -EMSGSIZE;
0ab6803b 4492
101bb229
TG		 4493 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
4494 ifa->idev->dev->ifindex);
4495
fad8da3e
YA		 4496 if (!((ifa->flags&IFA_F_PERMANENT) &&
4497 (ifa->prefered_lft == INFINITY_LIFE_TIME))) {
85486af0
TG		 4498 preferred = ifa->prefered_lft;
4499 valid = ifa->valid_lft;
4500 if (preferred != INFINITY_LIFE_TIME) {
1da177e4 4501 long tval = (jiffies - ifa->tstamp)/HZ;
a1faa698
JR		 4502 if (preferred > tval)
4503 preferred -= tval;
4504 else
4505 preferred = 0;
f56619fc
BH		 4506 if (valid != INFINITY_LIFE_TIME) {
4507 if (valid > tval)
4508 valid -= tval;
4509 else
4510 valid = 0;
4511 }
1da177e4
LT		 4512 }
4513 } else {
85486af0
TG		 4514 preferred = INFINITY_LIFE_TIME;
4515 valid = INFINITY_LIFE_TIME;
4516 }
4517
7996c799 4518 if (!ipv6_addr_any(&ifa->peer_addr)) {
930345ea
JB		 4519 if (nla_put_in6_addr(skb, IFA_LOCAL, &ifa->addr) < 0 ||
4520 nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->peer_addr) < 0)
caeaba79
ND		 4521 goto error;
4522 } else
930345ea 4523 if (nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->addr) < 0)
caeaba79
ND		 4524 goto error;
4525
4526 if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0)
4527 goto error;
1da177e4 4528
479840ff
JP		 4529 if (nla_put_u32(skb, IFA_FLAGS, ifa->flags) < 0)
4530 goto error;
4531
053c095a
JB		 4532 nlmsg_end(skb, nlh);
4533 return 0;
caeaba79
ND		 4534
4535error:
4536 nlmsg_cancel(skb, nlh);
4537 return -EMSGSIZE;
1da177e4
LT		 4538}
4539
4540static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
15e47304 4541 u32 portid, u32 seq, int event, u16 flags)
1da177e4 4542{
1da177e4 4543 struct nlmsghdr *nlh;
101bb229
TG		 4544 u8 scope = RT_SCOPE_UNIVERSE;
4545 int ifindex = ifmca->idev->dev->ifindex;
4546
4547 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
4548 scope = RT_SCOPE_SITE;
1da177e4 4549
15e47304 4550 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
63159f29 4551 if (!nlh)
26932566 4552 return -EMSGSIZE;
85486af0 4553
0ab6803b 4554 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
930345ea 4555 if (nla_put_in6_addr(skb, IFA_MULTICAST, &ifmca->mca_addr) < 0 ||
0ab6803b 4556 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
26932566
PM		 4557 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
4558 nlmsg_cancel(skb, nlh);
4559 return -EMSGSIZE;
4560 }
85486af0 4561
053c095a
JB		 4562 nlmsg_end(skb, nlh);
4563 return 0;
1da177e4
LT		 4564}
4565
4566static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
15e47304 4567 u32 portid, u32 seq, int event, unsigned int flags)
1da177e4 4568{
1da177e4 4569 struct nlmsghdr *nlh;
101bb229
TG		 4570 u8 scope = RT_SCOPE_UNIVERSE;
4571 int ifindex = ifaca->aca_idev->dev->ifindex;
4572
4573 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
4574 scope = RT_SCOPE_SITE;
1da177e4 4575
15e47304 4576 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
63159f29 4577 if (!nlh)
26932566 4578 return -EMSGSIZE;
85486af0 4579
0ab6803b 4580 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
930345ea 4581 if (nla_put_in6_addr(skb, IFA_ANYCAST, &ifaca->aca_addr) < 0 ||
0ab6803b 4582 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
26932566
PM		 4583 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
4584 nlmsg_cancel(skb, nlh);
4585 return -EMSGSIZE;
4586 }
1da177e4 4587
053c095a
JB		 4588 nlmsg_end(skb, nlh);
4589 return 0;
1da177e4
LT		 4590}
4591
e21e8467 4592enum addr_type_t {
1da177e4
LT		 4593 UNICAST_ADDR,
4594 MULTICAST_ADDR,
4595 ANYCAST_ADDR,
4596};
4597
234b27c3
ED		 4598/* called with rcu_read_lock() */
4599static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
4600 struct netlink_callback *cb, enum addr_type_t type,
4601 int s_ip_idx, int *p_ip_idx)
4602{
234b27c3
ED		 4603 struct ifmcaddr6 *ifmca;
4604 struct ifacaddr6 *ifaca;
4605 int err = 1;
4606 int ip_idx = *p_ip_idx;
4607
4608 read_lock_bh(&idev->lock);
4609 switch (type) {
502a2ffd 4610 case UNICAST_ADDR: {
4611 struct inet6_ifaddr *ifa;
4612
234b27c3 4613 /* unicast address incl. temp addr */
502a2ffd 4614 list_for_each_entry(ifa, &idev->addr_list, if_list) {
4615 if (++ip_idx < s_ip_idx)
234b27c3
ED		 4616 continue;
4617 err = inet6_fill_ifaddr(skb, ifa,
15e47304 4618 NETLINK_CB(cb->skb).portid,
234b27c3
ED		 4619 cb->nlh->nlmsg_seq,
4620 RTM_NEWADDR,
4621 NLM_F_MULTI);
053c095a 4622 if (err < 0)
234b27c3 4623 break;
63998ac2 4624 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
234b27c3
ED		 4625 }
4626 break;
502a2ffd 4627 }
234b27c3
ED		 4628 case MULTICAST_ADDR:
4629 /* multicast address */
4630 for (ifmca = idev->mc_list; ifmca;
4631 ifmca = ifmca->next, ip_idx++) {
4632 if (ip_idx < s_ip_idx)
4633 continue;
4634 err = inet6_fill_ifmcaddr(skb, ifmca,
15e47304 4635 NETLINK_CB(cb->skb).portid,
234b27c3
ED		 4636 cb->nlh->nlmsg_seq,
4637 RTM_GETMULTICAST,
4638 NLM_F_MULTI);
053c095a 4639 if (err < 0)
234b27c3
ED		 4640 break;
4641 }
4642 break;
4643 case ANYCAST_ADDR:
4644 /* anycast address */
4645 for (ifaca = idev->ac_list; ifaca;
4646 ifaca = ifaca->aca_next, ip_idx++) {
4647 if (ip_idx < s_ip_idx)
4648 continue;
4649 err = inet6_fill_ifacaddr(skb, ifaca,
15e47304 4650 NETLINK_CB(cb->skb).portid,
234b27c3
ED		 4651 cb->nlh->nlmsg_seq,
4652 RTM_GETANYCAST,
4653 NLM_F_MULTI);
053c095a 4654 if (err < 0)
234b27c3
ED		 4655 break;
4656 }
4657 break;
4658 default:
4659 break;
4660 }
4661 read_unlock_bh(&idev->lock);
4662 *p_ip_idx = ip_idx;
4663 return err;
4664}
4665
1da177e4
LT		 4666static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
4667 enum addr_type_t type)
4668{
234b27c3
ED		 4669 struct net *net = sock_net(skb->sk);
4670 int h, s_h;
1da177e4
LT		 4671 int idx, ip_idx;
4672 int s_idx, s_ip_idx;
1da177e4 4673 struct net_device *dev;
234b27c3
ED		 4674 struct inet6_dev *idev;
4675 struct hlist_head *head;
1ab1457c 4676
234b27c3
ED		 4677 s_h = cb->args[0];
4678 s_idx = idx = cb->args[1];
4679 s_ip_idx = ip_idx = cb->args[2];
5d5619b4 4680
234b27c3 4681 rcu_read_lock();
63998ac2 4682 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ net->dev_base_seq;
234b27c3
ED		 4683 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4684 idx = 0;
4685 head = &net->dev_index_head[h];
b67bfe0d 4686 hlist_for_each_entry_rcu(dev, head, index_hlist) {
234b27c3
ED		 4687 if (idx < s_idx)
4688 goto cont;
4b97efdf 4689 if (h > s_h || idx > s_idx)
234b27c3
ED		 4690 s_ip_idx = 0;
4691 ip_idx = 0;
e21e8467
SH		 4692 idev = __in6_dev_get(dev);
4693 if (!idev)
234b27c3
ED		 4694 goto cont;
4695
4696 if (in6_dump_addrs(idev, skb, cb, type,
7b46a644 4697 s_ip_idx, &ip_idx) < 0)
234b27c3 4698 goto done;
7562f876 4699cont:
234b27c3
ED		 4700 idx++;
4701 }
1da177e4 4702 }
234b27c3
ED		 4703done:
4704 rcu_read_unlock();
4705 cb->args[0] = h;
4706 cb->args[1] = idx;
4707 cb->args[2] = ip_idx;
4708
1da177e4
LT		 4709 return skb->len;
4710}
4711
4712static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
4713{
4714 enum addr_type_t type = UNICAST_ADDR;
b854272b 4715
1da177e4
LT		 4716 return inet6_dump_addr(skb, cb, type);
4717}
4718
4719static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
4720{
4721 enum addr_type_t type = MULTICAST_ADDR;
b854272b 4722
1da177e4
LT		 4723 return inet6_dump_addr(skb, cb, type);
4724}
4725
4726
4727static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
4728{
4729 enum addr_type_t type = ANYCAST_ADDR;
b854272b 4730
1da177e4
LT		 4731 return inet6_dump_addr(skb, cb, type);
4732}
4733
661d2967 4734static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh)
6c223828 4735{
3b1e0a65 4736 struct net *net = sock_net(in_skb->sk);
1b29fc2c
TG		 4737 struct ifaddrmsg *ifm;
4738 struct nlattr *tb[IFA_MAX+1];
caeaba79 4739 struct in6_addr *addr = NULL, *peer;
6c223828
NT		 4740 struct net_device *dev = NULL;
4741 struct inet6_ifaddr *ifa;
4742 struct sk_buff *skb;
6c223828
NT		 4743 int err;
4744
1b29fc2c
TG		 4745 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
4746 if (err < 0)
4747 goto errout;
4748
caeaba79 4749 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer);
63159f29 4750 if (!addr) {
1b29fc2c
TG		 4751 err = -EINVAL;
4752 goto errout;
6c223828 4753 }
6c223828 4754
1b29fc2c 4755 ifm = nlmsg_data(nlh);
6c223828 4756 if (ifm->ifa_index)
6fda7350 4757 dev = __dev_get_by_index(net, ifm->ifa_index);
6c223828 4758
e21e8467
SH		 4759 ifa = ipv6_get_ifaddr(net, addr, dev, 1);
4760 if (!ifa) {
1b29fc2c
TG		 4761 err = -EADDRNOTAVAIL;
4762 goto errout;
4763 }
6c223828 4764
e21e8467
SH		 4765 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
4766 if (!skb) {
6c223828 4767 err = -ENOBUFS;
1b29fc2c 4768 goto errout_ifa;
6c223828
NT		 4769 }
4770
15e47304 4771 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).portid,
6c223828 4772 nlh->nlmsg_seq, RTM_NEWADDR, 0);
26932566
PM		 4773 if (err < 0) {
4774 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4775 WARN_ON(err == -EMSGSIZE);
4776 kfree_skb(skb);
4777 goto errout_ifa;
4778 }
15e47304 4779 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
1b29fc2c 4780errout_ifa:
6c223828 4781 in6_ifa_put(ifa);
1b29fc2c 4782errout:
6c223828 4783 return err;
6c223828
NT		 4784}
4785
1da177e4
LT		 4786static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
4787{
4788 struct sk_buff *skb;
c346dca1 4789 struct net *net = dev_net(ifa->idev->dev);
5d620266 4790 int err = -ENOBUFS;
1da177e4 4791
0ab6803b 4792 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
63159f29 4793 if (!skb)
5d620266
TG		 4794 goto errout;
4795
4796 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
26932566
PM		 4797 if (err < 0) {
4798 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4799 WARN_ON(err == -EMSGSIZE);
4800 kfree_skb(skb);
4801 goto errout;
4802 }
1ce85fe4
PNA		 4803 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
4804 return;
5d620266
TG		 4805errout:
4806 if (err < 0)
6fda7350 4807 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
1da177e4
LT		 4808}
4809
b6f99a21 4810static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
1da177e4
LT		 4811 __s32 *array, int bytes)
4812{
04561c1f
TG		 4813 BUG_ON(bytes < (DEVCONF_MAX * 4));
4814
1da177e4
LT		 4815 memset(array, 0, bytes);
4816 array[DEVCONF_FORWARDING] = cnf->forwarding;
4817 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
4818 array[DEVCONF_MTU6] = cnf->mtu6;
4819 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
4820 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
4821 array[DEVCONF_AUTOCONF] = cnf->autoconf;
4822 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
4823 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
93908d19
TG		 4824 array[DEVCONF_RTR_SOLICIT_INTERVAL] =
4825 jiffies_to_msecs(cnf->rtr_solicit_interval);
4826 array[DEVCONF_RTR_SOLICIT_DELAY] =
4827 jiffies_to_msecs(cnf->rtr_solicit_delay);
1da177e4 4828 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
fc4eba58
HFS		 4829 array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] =
4830 jiffies_to_msecs(cnf->mldv1_unsolicited_report_interval);
4831 array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] =
4832 jiffies_to_msecs(cnf->mldv2_unsolicited_report_interval);
1da177e4
LT		 4833 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
4834 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
4835 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
4836 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
4837 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
1da177e4 4838 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
65f5c7c1 4839 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
8013d1d7 4840 array[DEVCONF_ACCEPT_RA_MIN_HOP_LIMIT] = cnf->accept_ra_min_hop_limit;
c4fd30eb 4841 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
930d6ff2
YH		 4842#ifdef CONFIG_IPV6_ROUTER_PREF
4843 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
93908d19
TG		 4844 array[DEVCONF_RTR_PROBE_INTERVAL] =
4845 jiffies_to_msecs(cnf->rtr_probe_interval);
fa03ef38 4846#ifdef CONFIG_IPV6_ROUTE_INFO
09c884d4
YH		 4847 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
4848#endif
930d6ff2 4849#endif
fbea49e1 4850 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
0bcbc926 4851 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
95c385b4
NH		 4852#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4853 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
7fd2561e 4854 array[DEVCONF_USE_OPTIMISTIC] = cnf->use_optimistic;
95c385b4 4855#endif
7bc570c8
YH		 4856#ifdef CONFIG_IPV6_MROUTE
4857 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
4858#endif
778d80be 4859 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
1b34be74 4860 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
c3faca05 4861 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
5cb04436 4862 array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify;
b800c3b9 4863 array[DEVCONF_SUPPRESS_FRAG_NDISC] = cnf->suppress_frag_ndisc;
d9333196 4864 array[DEVCONF_ACCEPT_RA_FROM_LOCAL] = cnf->accept_ra_from_local;
c2943f14 4865 array[DEVCONF_ACCEPT_RA_MTU] = cnf->accept_ra_mtu;
35103d11 4866 array[DEVCONF_IGNORE_ROUTES_WITH_LINKDOWN] = cnf->ignore_routes_with_linkdown;
3d1bec99 4867 /* we omit DEVCONF_STABLE_SECRET for now */
3985e8a3 4868 array[DEVCONF_USE_OIF_ADDRS_ONLY] = cnf->use_oif_addrs_only;
abbc3043 4869 array[DEVCONF_DROP_UNICAST_IN_L2_MULTICAST] = cnf->drop_unicast_in_l2_multicast;
7a02bf89 4870 array[DEVCONF_DROP_UNSOLICITED_NA] = cnf->drop_unsolicited_na;
f1705ec1 4871 array[DEVCONF_KEEP_ADDR_ON_DOWN] = cnf->keep_addr_on_down;
1da177e4
LT		 4872}
4873
b382b191
TG		 4874static inline size_t inet6_ifla6_size(void)
4875{
4876 return nla_total_size(4) /* IFLA_INET6_FLAGS */
4877 + nla_total_size(sizeof(struct ifla_cacheinfo))
4878 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
4879 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
f53adae4
DB		 4880 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
4881 + nla_total_size(sizeof(struct in6_addr)); /* IFLA_INET6_TOKEN */
b382b191
TG		 4882}
4883
339bf98f
TG		 4884static inline size_t inet6_if_nlmsg_size(void)
4885{
4886 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
4887 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
4888 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
4889 + nla_total_size(4) /* IFLA_MTU */
4890 + nla_total_size(4) /* IFLA_LINK */
0344338b 4891 + nla_total_size(1) /* IFLA_OPERSTATE */
b382b191 4892 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */
339bf98f 4893}
c5396a31 4894
be281e55 4895static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib,
7d720c3e 4896 int items, int bytes)
7f7d9a6b
HX		 4897{
4898 int i;
4899 int pad = bytes - sizeof(u64) * items;
4900 BUG_ON(pad < 0);
4901
4902 /* Use put_unaligned() because stats may not be aligned for u64. */
4903 put_unaligned(items, &stats[0]);
4904 for (i = 1; i < items; i++)
be281e55 4905 put_unaligned(atomic_long_read(&mib[i]), &stats[i]);
7f7d9a6b
HX		 4906
4907 memset(&stats[items], 0, pad);
4908}
4909
698365fa 4910static inline void __snmp6_fill_stats64(u64 *stats, void __percpu *mib,
a3a77372 4911 int bytes, size_t syncpoff)
4ce3c183 4912{
a3a77372
R		 4913 int i, c;
4914 u64 buff[IPSTATS_MIB_MAX];
4915 int pad = bytes - sizeof(u64) * IPSTATS_MIB_MAX;
4916
4ce3c183
ED		 4917 BUG_ON(pad < 0);
4918
a3a77372
R		 4919 memset(buff, 0, sizeof(buff));
4920 buff[0] = IPSTATS_MIB_MAX;
4ce3c183 4921
a3a77372
R		 4922 for_each_possible_cpu(c) {
4923 for (i = 1; i < IPSTATS_MIB_MAX; i++)
4924 buff[i] += snmp_get_cpu_field64(mib, c, i, syncpoff);
4925 }
4926
4927 memcpy(stats, buff, IPSTATS_MIB_MAX * sizeof(u64));
4928 memset(&stats[IPSTATS_MIB_MAX], 0, pad);
4ce3c183
ED		 4929}
4930
7f7d9a6b
HX		 4931static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
4932 int bytes)
4933{
e21e8467 4934 switch (attrtype) {
7f7d9a6b 4935 case IFLA_INET6_STATS:
a3a77372
R		 4936 __snmp6_fill_stats64(stats, idev->stats.ipv6, bytes,
4937 offsetof(struct ipstats_mib, syncp));
7f7d9a6b
HX		 4938 break;
4939 case IFLA_INET6_ICMP6STATS:
be281e55 4940 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, ICMP6_MIB_MAX, bytes);
7f7d9a6b
HX		 4941 break;
4942 }
4943}
4944
d5566fd7
SV		 4945static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev,
4946 u32 ext_filter_mask)
b382b191
TG		 4947{
4948 struct nlattr *nla;
4949 struct ifla_cacheinfo ci;
4950
c78679e8
DM		 4951 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags))
4952 goto nla_put_failure;
b382b191 4953 ci.max_reasm_len = IPV6_MAXPLEN;
24912420
DM		 4954 ci.tstamp = cstamp_delta(idev->tstamp);
4955 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time);
1f9248e5 4956 ci.retrans_time = jiffies_to_msecs(NEIGH_VAR(idev->nd_parms, RETRANS_TIME));
c78679e8
DM		 4957 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci))
4958 goto nla_put_failure;
b382b191 4959 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
63159f29 4960 if (!nla)
b382b191
TG		 4961 goto nla_put_failure;
4962 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
4963
4964 /* XXX - MC not implemented */
4965
d5566fd7
SV		 4966 if (ext_filter_mask & RTEXT_FILTER_SKIP_STATS)
4967 return 0;
4968
b382b191 4969 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
63159f29 4970 if (!nla)
b382b191
TG		 4971 goto nla_put_failure;
4972 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
4973
4974 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
63159f29 4975 if (!nla)
b382b191
TG		 4976 goto nla_put_failure;
4977 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
4978
f53adae4 4979 nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr));
63159f29 4980 if (!nla)
f53adae4 4981 goto nla_put_failure;
bc91b0f0
JP		 4982
4983 if (nla_put_u8(skb, IFLA_INET6_ADDR_GEN_MODE, idev->addr_gen_mode))
4984 goto nla_put_failure;
4985
f53adae4
DB		 4986 read_lock_bh(&idev->lock);
4987 memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla));
4988 read_unlock_bh(&idev->lock);
4989
b382b191
TG		 4990 return 0;
4991
4992nla_put_failure:
4993 return -EMSGSIZE;
4994}
4995
b1974ed0
AR		 4996static size_t inet6_get_link_af_size(const struct net_device *dev,
4997 u32 ext_filter_mask)
b382b191
TG		 4998{
4999 if (!__in6_dev_get(dev))
5000 return 0;
5001
5002 return inet6_ifla6_size();
5003}
5004
d5566fd7
SV		 5005static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev,
5006 u32 ext_filter_mask)
b382b191
TG		 5007{
5008 struct inet6_dev *idev = __in6_dev_get(dev);
5009
5010 if (!idev)
5011 return -ENODATA;
5012
d5566fd7 5013 if (inet6_fill_ifla6_attrs(skb, idev, ext_filter_mask) < 0)
b382b191
TG		 5014 return -EMSGSIZE;
5015
5016 return 0;
5017}
5018
f53adae4
DB		 5019static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token)
5020{
f53adae4
DB		 5021 struct inet6_ifaddr *ifp;
5022 struct net_device *dev = idev->dev;
47e27d5e 5023 bool clear_token, update_rs = false;
dc848292 5024 struct in6_addr ll_addr;
f53adae4 5025
c15b1cca
HFS		 5026 ASSERT_RTNL();
5027
63159f29 5028 if (!token)
f53adae4 5029 return -EINVAL;
f53adae4
DB		 5030 if (dev->flags & (IFF_LOOPBACK | IFF_NOARP))
5031 return -EINVAL;
f53adae4
DB		 5032 if (!ipv6_accept_ra(idev))
5033 return -EINVAL;
5034 if (idev->cnf.rtr_solicits <= 0)
5035 return -EINVAL;
5036
5037 write_lock_bh(&idev->lock);
5038
5039 BUILD_BUG_ON(sizeof(token->s6_addr) != 16);
5040 memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8);
5041
5042 write_unlock_bh(&idev->lock);
5043
47e27d5e
DB		 5044 clear_token = ipv6_addr_any(token);
5045 if (clear_token)
5046 goto update_lft;
5047
dc848292
HFS		 5048 if (!idev->dead && (idev->if_flags & IF_READY) &&
5049 !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE |
5050 IFA_F_OPTIMISTIC)) {
fc403832
DB		 5051 /* If we're not ready, then normal ifup will take care
5052 * of this. Otherwise, we need to request our rs here.
5053 */
5054 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters);
5055 update_rs = true;
5056 }
f53adae4 5057
47e27d5e 5058update_lft:
f53adae4 5059 write_lock_bh(&idev->lock);
fc403832 5060
77ecaace 5061 if (update_rs) {
fc403832 5062 idev->if_flags |= IF_RS_SENT;
77ecaace
HFS		 5063 idev->rs_probes = 1;
5064 addrconf_mod_rs_timer(idev, idev->cnf.rtr_solicit_interval);
5065 }
f53adae4
DB		 5066
5067 /* Well, that's kinda nasty ... */
5068 list_for_each_entry(ifp, &idev->addr_list, if_list) {
5069 spin_lock(&ifp->lock);
617fe29d 5070 if (ifp->tokenized) {
f53adae4
DB		 5071 ifp->valid_lft = 0;
5072 ifp->prefered_lft = 0;
5073 }
5074 spin_unlock(&ifp->lock);
5075 }
5076
5077 write_unlock_bh(&idev->lock);
b2ed64a9 5078 inet6_ifinfo_notify(RTM_NEWLINK, idev);
c15b1cca 5079 addrconf_verify_rtnl();
f53adae4
DB		 5080 return 0;
5081}
5082
11b1f828
DB		 5083static const struct nla_policy inet6_af_policy[IFLA_INET6_MAX + 1] = {
5084 [IFLA_INET6_ADDR_GEN_MODE] = { .type = NLA_U8 },
5085 [IFLA_INET6_TOKEN] = { .len = sizeof(struct in6_addr) },
5086};
5087
5088static int inet6_validate_link_af(const struct net_device *dev,
5089 const struct nlattr *nla)
5090{
5091 struct nlattr *tb[IFLA_INET6_MAX + 1];
5092
5093 if (dev && !__in6_dev_get(dev))
5094 return -EAFNOSUPPORT;
5095
5096 return nla_parse_nested(tb, IFLA_INET6_MAX, nla, inet6_af_policy);
5097}
5098
f53adae4
DB		 5099static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla)
5100{
5101 int err = -EINVAL;
5102 struct inet6_dev *idev = __in6_dev_get(dev);
5103 struct nlattr *tb[IFLA_INET6_MAX + 1];
5104
5105 if (!idev)
5106 return -EAFNOSUPPORT;
5107
5108 if (nla_parse_nested(tb, IFLA_INET6_MAX, nla, NULL) < 0)
5109 BUG();
5110
bc91b0f0 5111 if (tb[IFLA_INET6_TOKEN]) {
f53adae4 5112 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN]));
bc91b0f0
JP		 5113 if (err)
5114 return err;
5115 }
5116
5117 if (tb[IFLA_INET6_ADDR_GEN_MODE]) {
5118 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]);
5119
5120 if (mode != IN6_ADDR_GEN_MODE_EUI64 &&
622c81d5 5121 mode != IN6_ADDR_GEN_MODE_NONE &&
cc9da6cc
BM		 5122 mode != IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
5123 mode != IN6_ADDR_GEN_MODE_RANDOM)
622c81d5
HFS		 5124 return -EINVAL;
5125
5126 if (mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
5127 !idev->cnf.stable_secret.initialized &&
5128 !dev_net(dev)->ipv6.devconf_dflt->stable_secret.initialized)
bc91b0f0 5129 return -EINVAL;
622c81d5 5130
bc91b0f0
JP		 5131 idev->addr_gen_mode = mode;
5132 err = 0;
5133 }
f53adae4
DB		 5134
5135 return err;
5136}
5137
1ab1457c 5138static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
15e47304 5139 u32 portid, u32 seq, int event, unsigned int flags)
1da177e4 5140{
04561c1f 5141 struct net_device *dev = idev->dev;
04561c1f
TG		 5142 struct ifinfomsg *hdr;
5143 struct nlmsghdr *nlh;
5144 void *protoinfo;
04561c1f 5145
15e47304 5146 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags);
63159f29 5147 if (!nlh)
26932566 5148 return -EMSGSIZE;
04561c1f
TG		 5149
5150 hdr = nlmsg_data(nlh);
5151 hdr->ifi_family = AF_INET6;
5152 hdr->__ifi_pad = 0;
5153 hdr->ifi_type = dev->type;
5154 hdr->ifi_index = dev->ifindex;
5155 hdr->ifi_flags = dev_get_flags(dev);
5156 hdr->ifi_change = 0;
5157
c78679e8
DM		 5158 if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
5159 (dev->addr_len &&
5160 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
5161 nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
a54acb3a 5162 (dev->ifindex != dev_get_iflink(dev) &&
0344338b
AG		 5163 nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))) ||
5164 nla_put_u8(skb, IFLA_OPERSTATE,
5165 netif_running(dev) ? dev->operstate : IF_OPER_DOWN))
c78679e8 5166 goto nla_put_failure;
04561c1f 5167 protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
63159f29 5168 if (!protoinfo)
04561c1f 5169 goto nla_put_failure;
1da177e4 5170
d5566fd7 5171 if (inet6_fill_ifla6_attrs(skb, idev, 0) < 0)
bf99f1bd 5172 goto nla_put_failure;
1da177e4 5173
04561c1f 5174 nla_nest_end(skb, protoinfo);
053c095a
JB		 5175 nlmsg_end(skb, nlh);
5176 return 0;
1da177e4 5177
04561c1f 5178nla_put_failure:
26932566
PM		 5179 nlmsg_cancel(skb, nlh);
5180 return -EMSGSIZE;
1da177e4
LT		 5181}
5182
5183static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
5184{
3b1e0a65 5185 struct net *net = sock_net(skb->sk);
84d2697d 5186 int h, s_h;
434a8a58 5187 int idx = 0, s_idx;
1da177e4
LT		 5188 struct net_device *dev;
5189 struct inet6_dev *idev;
84d2697d 5190 struct hlist_head *head;
1da177e4 5191
84d2697d
ED		 5192 s_h = cb->args[0];
5193 s_idx = cb->args[1];
5194
5195 rcu_read_lock();
5196 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
5197 idx = 0;
5198 head = &net->dev_index_head[h];
b67bfe0d 5199 hlist_for_each_entry_rcu(dev, head, index_hlist) {
84d2697d
ED		 5200 if (idx < s_idx)
5201 goto cont;
5202 idev = __in6_dev_get(dev);
5203 if (!idev)
5204 goto cont;
5205 if (inet6_fill_ifinfo(skb, idev,
15e47304 5206 NETLINK_CB(cb->skb).portid,
84d2697d 5207 cb->nlh->nlmsg_seq,
053c095a 5208 RTM_NEWLINK, NLM_F_MULTI) < 0)
84d2697d 5209 goto out;
7562f876 5210cont:
84d2697d
ED		 5211 idx++;
5212 }
1da177e4 5213 }
84d2697d
ED		 5214out:
5215 rcu_read_unlock();
5216 cb->args[1] = idx;
5217 cb->args[0] = h;
1da177e4
LT		 5218
5219 return skb->len;
5220}
5221
5222void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
5223{
5224 struct sk_buff *skb;
c346dca1 5225 struct net *net = dev_net(idev->dev);
8d7a76c9 5226 int err = -ENOBUFS;
1ab1457c 5227
339bf98f 5228 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
63159f29 5229 if (!skb)
8d7a76c9
TG		 5230 goto errout;
5231
5232 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
26932566
PM		 5233 if (err < 0) {
5234 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
5235 WARN_ON(err == -EMSGSIZE);
5236 kfree_skb(skb);
5237 goto errout;
5238 }
5f75a104 5239 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC);
1ce85fe4 5240 return;
8d7a76c9
TG		 5241errout:
5242 if (err < 0)
5f75a104 5243 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err);
1da177e4
LT		 5244}
5245
339bf98f
TG		 5246static inline size_t inet6_prefix_nlmsg_size(void)
5247{
5248 return NLMSG_ALIGN(sizeof(struct prefixmsg))
5249 + nla_total_size(sizeof(struct in6_addr))
5250 + nla_total_size(sizeof(struct prefix_cacheinfo));
5251}
c5396a31 5252
1da177e4 5253static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
15e47304 5254 struct prefix_info *pinfo, u32 portid, u32 seq,
6051e2f4 5255 int event, unsigned int flags)
1da177e4 5256{
6051e2f4
TG		 5257 struct prefixmsg *pmsg;
5258 struct nlmsghdr *nlh;
1da177e4
LT		 5259 struct prefix_cacheinfo ci;
5260
15e47304 5261 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags);
63159f29 5262 if (!nlh)
26932566 5263 return -EMSGSIZE;
6051e2f4
TG		 5264
5265 pmsg = nlmsg_data(nlh);
1da177e4 5266 pmsg->prefix_family = AF_INET6;
8a47077a
PM		 5267 pmsg->prefix_pad1 = 0;
5268 pmsg->prefix_pad2 = 0;
1da177e4
LT		 5269 pmsg->prefix_ifindex = idev->dev->ifindex;
5270 pmsg->prefix_len = pinfo->prefix_len;
5271 pmsg->prefix_type = pinfo->type;
8a47077a 5272 pmsg->prefix_pad3 = 0;
1da177e4
LT		 5273 pmsg->prefix_flags = 0;
5274 if (pinfo->onlink)
5275 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
5276 if (pinfo->autoconf)
5277 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
5278
c78679e8
DM		 5279 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix))
5280 goto nla_put_failure;
1da177e4
LT		 5281 ci.preferred_time = ntohl(pinfo->prefered);
5282 ci.valid_time = ntohl(pinfo->valid);
c78679e8
DM		 5283 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci))
5284 goto nla_put_failure;
053c095a
JB		 5285 nlmsg_end(skb, nlh);
5286 return 0;
1da177e4 5287
6051e2f4 5288nla_put_failure:
26932566
PM		 5289 nlmsg_cancel(skb, nlh);
5290 return -EMSGSIZE;
1da177e4
LT		 5291}
5292
1ab1457c 5293static void inet6_prefix_notify(int event, struct inet6_dev *idev,
1da177e4
LT		 5294 struct prefix_info *pinfo)
5295{
5296 struct sk_buff *skb;
c346dca1 5297 struct net *net = dev_net(idev->dev);
8c384bfa 5298 int err = -ENOBUFS;
1da177e4 5299
339bf98f 5300 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
63159f29 5301 if (!skb)
8c384bfa
TG		 5302 goto errout;
5303
5304 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
26932566
PM		 5305 if (err < 0) {
5306 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
5307 WARN_ON(err == -EMSGSIZE);
5308 kfree_skb(skb);
5309 goto errout;
5310 }
1ce85fe4
PNA		 5311 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
5312 return;
8c384bfa
TG		 5313errout:
5314 if (err < 0)
6fda7350 5315 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
1da177e4
LT		 5316}
5317
1da177e4
LT		 5318static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
5319{
63998ac2
ND		 5320 struct net *net = dev_net(ifp->idev->dev);
5321
c15b1cca
HFS		 5322 if (event)
5323 ASSERT_RTNL();
5324
1da177e4
LT		 5325 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
5326
5327 switch (event) {
5328 case RTM_NEWADDR:
95c385b4
NH		 5329 /*
5330 * If the address was optimistic
5331 * we inserted the route at the start of
5332 * our DAD process, so we don't need
5333 * to do it again
5334 */
5335 if (!(ifp->rt->rt6i_node))
5336 ip6_ins_rt(ifp->rt);
1da177e4
LT		 5337 if (ifp->idev->cnf.forwarding)
5338 addrconf_join_anycast(ifp);
7996c799 5339 if (!ipv6_addr_any(&ifp->peer_addr))
caeaba79
ND		 5340 addrconf_prefix_route(&ifp->peer_addr, 128,
5341 ifp->idev->dev, 0, 0);
1da177e4
LT		 5342 break;
5343 case RTM_DELADDR:
5344 if (ifp->idev->cnf.forwarding)
5345 addrconf_leave_anycast(ifp);
5346 addrconf_leave_solict(ifp->idev, &ifp->addr);
7996c799 5347 if (!ipv6_addr_any(&ifp->peer_addr)) {
caeaba79 5348 struct rt6_info *rt;
caeaba79 5349
e7478dfc
ND		 5350 rt = addrconf_get_prefix_route(&ifp->peer_addr, 128,
5351 ifp->idev->dev, 0, 0);
8e3d5be7
MKL		 5352 if (rt)
5353 ip6_del_rt(rt);
caeaba79 5354 }
38bd10c4
DA		 5355 if (ifp->rt) {
5356 dst_hold(&ifp->rt->dst);
5357 ip6_del_rt(ifp->rt);
5358 }
705f1c86 5359 rt_genid_bump_ipv6(net);
1da177e4
LT		 5360 break;
5361 }
63998ac2 5362 atomic_inc(&net->ipv6.dev_addr_genid);
1da177e4
LT		 5363}
5364
5365static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
5366{
8814c4b5 5367 rcu_read_lock_bh();
1da177e4
LT		 5368 if (likely(ifp->idev->dead == 0))
5369 __ipv6_ifa_notify(event, ifp);
8814c4b5 5370 rcu_read_unlock_bh();
1da177e4
LT		 5371}
5372
5373#ifdef CONFIG_SYSCTL
5374
5375static
fe2c6338 5376int addrconf_sysctl_forward(struct ctl_table *ctl, int write,
1da177e4
LT		 5377 void __user *buffer, size_t *lenp, loff_t *ppos)
5378{
5379 int *valp = ctl->data;
5380 int val = *valp;
88af182e 5381 loff_t pos = *ppos;
fe2c6338 5382 struct ctl_table lctl;
1da177e4
LT		 5383 int ret;
5384
013d97e9
FR		 5385 /*
5386 * ctl->data points to idev->cnf.forwarding, we should
5387 * not modify it until we get the rtnl lock.
5388 */
5389 lctl = *ctl;
5390 lctl.data = &val;
5391
5392 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
1da177e4 5393
c8fecf22 5394 if (write)
b325fddb 5395 ret = addrconf_fixup_forwarding(ctl, valp, val);
88af182e
EB		 5396 if (ret)
5397 *ppos = pos;
1ab1457c 5398 return ret;
1da177e4
LT		 5399}
5400
d6df198d
PS		 5401static
5402int addrconf_sysctl_hop_limit(struct ctl_table *ctl, int write,
5403 void __user *buffer, size_t *lenp, loff_t *ppos)
5404{
5405 struct ctl_table lctl;
5406 int min_hl = 1, max_hl = 255;
5407
5408 lctl = *ctl;
5409 lctl.extra1 = &min_hl;
5410 lctl.extra2 = &max_hl;
5411
5412 return proc_dointvec_minmax(&lctl, write, buffer, lenp, ppos);
5413}
5414
77751427
ML		 5415static
5416int addrconf_sysctl_mtu(struct ctl_table *ctl, int write,
5417 void __user *buffer, size_t *lenp, loff_t *ppos)
5418{
5419 struct inet6_dev *idev = ctl->extra1;
5420 int min_mtu = IPV6_MIN_MTU;
5421 struct ctl_table lctl;
5422
5423 lctl = *ctl;
5424 lctl.extra1 = &min_mtu;
5425 lctl.extra2 = idev ? &idev->dev->mtu : NULL;
5426
5427 return proc_dointvec_minmax(&lctl, write, buffer, lenp, ppos);
5428}
5429
56d417b1
BH		 5430static void dev_disable_change(struct inet6_dev *idev)
5431{
75538c2b
CW		 5432 struct netdev_notifier_info info;
5433
56d417b1
BH		 5434 if (!idev || !idev->dev)
5435 return;
5436
75538c2b 5437 netdev_notifier_info_init(&info, idev->dev);
56d417b1 5438 if (idev->cnf.disable_ipv6)
75538c2b 5439 addrconf_notify(NULL, NETDEV_DOWN, &info);
56d417b1 5440 else
75538c2b 5441 addrconf_notify(NULL, NETDEV_UP, &info);
56d417b1
BH		 5442}
5443
5444static void addrconf_disable_change(struct net *net, __s32 newf)
5445{
5446 struct net_device *dev;
5447 struct inet6_dev *idev;
5448
c6d14c84
ED		 5449 rcu_read_lock();
5450 for_each_netdev_rcu(net, dev) {
56d417b1
BH		 5451 idev = __in6_dev_get(dev);
5452 if (idev) {
5453 int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
5454 idev->cnf.disable_ipv6 = newf;
5455 if (changed)
5456 dev_disable_change(idev);
5457 }
56d417b1 5458 }
c6d14c84 5459 rcu_read_unlock();
56d417b1
BH		 5460}
5461
013d97e9 5462static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf)
56d417b1
BH		 5463{
5464 struct net *net;
013d97e9
FR		 5465 int old;
5466
5467 if (!rtnl_trylock())
5468 return restart_syscall();
56d417b1
BH		 5469
5470 net = (struct net *)table->extra2;
013d97e9
FR		 5471 old = *p;
5472 *p = newf;
56d417b1 5473
013d97e9
FR		 5474 if (p == &net->ipv6.devconf_dflt->disable_ipv6) {
5475 rtnl_unlock();
56d417b1 5476 return 0;
88af182e 5477 }
56d417b1
BH		 5478
5479 if (p == &net->ipv6.devconf_all->disable_ipv6) {
56d417b1
BH		 5480 net->ipv6.devconf_dflt->disable_ipv6 = newf;
5481 addrconf_disable_change(net, newf);
013d97e9 5482 } else if ((!newf) ^ (!old))
56d417b1
BH		 5483 dev_disable_change((struct inet6_dev *)table->extra1);
5484
5485 rtnl_unlock();
5486 return 0;
5487}
5488
5489static
fe2c6338 5490int addrconf_sysctl_disable(struct ctl_table *ctl, int write,
56d417b1
BH		 5491 void __user *buffer, size_t *lenp, loff_t *ppos)
5492{
5493 int *valp = ctl->data;
5494 int val = *valp;
88af182e 5495 loff_t pos = *ppos;
fe2c6338 5496 struct ctl_table lctl;
56d417b1
BH		 5497 int ret;
5498
013d97e9
FR		 5499 /*
5500 * ctl->data points to idev->cnf.disable_ipv6, we should
5501 * not modify it until we get the rtnl lock.
5502 */
5503 lctl = *ctl;
5504 lctl.data = &val;
5505
5506 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
56d417b1
BH		 5507
5508 if (write)
5509 ret = addrconf_disable_ipv6(ctl, valp, val);
88af182e
EB		 5510 if (ret)
5511 *ppos = pos;
56d417b1
BH		 5512 return ret;
5513}
5514
c92d5491 5515static
5516int addrconf_sysctl_proxy_ndp(struct ctl_table *ctl, int write,
5517 void __user *buffer, size_t *lenp, loff_t *ppos)
5518{
5519 int *valp = ctl->data;
5520 int ret;
5521 int old, new;
5522
5523 old = *valp;
5524 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
5525 new = *valp;
5526
5527 if (write && old != new) {
5528 struct net *net = ctl->extra2;
5529
5530 if (!rtnl_trylock())
5531 return restart_syscall();
5532
5533 if (valp == &net->ipv6.devconf_dflt->proxy_ndp)
5534 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
5535 NETCONFA_IFINDEX_DEFAULT,
5536 net->ipv6.devconf_dflt);
5537 else if (valp == &net->ipv6.devconf_all->proxy_ndp)
5538 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
5539 NETCONFA_IFINDEX_ALL,
5540 net->ipv6.devconf_all);
5541 else {
5542 struct inet6_dev *idev = ctl->extra1;
5543
5544 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
5545 idev->dev->ifindex,
5546 &idev->cnf);
5547 }
5548 rtnl_unlock();
5549 }
5550
5551 return ret;
5552}
5553
3d1bec99
HFS		 5554static int addrconf_sysctl_stable_secret(struct ctl_table *ctl, int write,
5555 void __user *buffer, size_t *lenp,
5556 loff_t *ppos)
5557{
5558 int err;
5559 struct in6_addr addr;
5560 char str[IPV6_MAX_STRLEN];
5561 struct ctl_table lctl = *ctl;
622c81d5 5562 struct net *net = ctl->extra2;
3d1bec99
HFS		 5563 struct ipv6_stable_secret *secret = ctl->data;
5564
622c81d5
HFS		 5565 if (&net->ipv6.devconf_all->stable_secret == ctl->data)
5566 return -EIO;
5567
3d1bec99
HFS		 5568 lctl.maxlen = IPV6_MAX_STRLEN;
5569 lctl.data = str;
5570
5571 if (!rtnl_trylock())
5572 return restart_syscall();
5573
5574 if (!write && !secret->initialized) {
5575 err = -EIO;
5576 goto out;
5577 }
5578
5449a5ca
WC		 5579 err = snprintf(str, sizeof(str), "%pI6", &secret->secret);
5580 if (err >= sizeof(str)) {
5581 err = -EIO;
5582 goto out;
3d1bec99
HFS		 5583 }
5584
5585 err = proc_dostring(&lctl, write, buffer, lenp, ppos);
5586 if (err || !write)
5587 goto out;
5588
5589 if (in6_pton(str, -1, addr.in6_u.u6_addr8, -1, NULL) != 1) {
5590 err = -EIO;
5591 goto out;
5592 }
5593
5594 secret->initialized = true;
5595 secret->secret = addr;
5596
622c81d5
HFS		 5597 if (&net->ipv6.devconf_dflt->stable_secret == ctl->data) {
5598 struct net_device *dev;
5599
5600 for_each_netdev(net, dev) {
5601 struct inet6_dev *idev = __in6_dev_get(dev);
5602
5603 if (idev) {
5604 idev->addr_gen_mode =
5605 IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
5606 }
5607 }
5608 } else {
5609 struct inet6_dev *idev = ctl->extra1;
5610
5611 idev->addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
5612 }
5613
3d1bec99
HFS		 5614out:
5615 rtnl_unlock();
5616
5617 return err;
5618}
c92d5491 5619
35103d11
AG		 5620static
5621int addrconf_sysctl_ignore_routes_with_linkdown(struct ctl_table *ctl,
5622 int write,
5623 void __user *buffer,
5624 size_t *lenp,
5625 loff_t *ppos)
5626{
5627 int *valp = ctl->data;
5628 int val = *valp;
5629 loff_t pos = *ppos;
5630 struct ctl_table lctl;
5631 int ret;
5632
5633 /* ctl->data points to idev->cnf.ignore_routes_when_linkdown
5634 * we should not modify it until we get the rtnl lock.
5635 */
5636 lctl = *ctl;
5637 lctl.data = &val;
5638
5639 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
5640
5641 if (write)
5642 ret = addrconf_fixup_linkdown(ctl, valp, val);
5643 if (ret)
5644 *ppos = pos;
5645 return ret;
5646}
5647
607ea7cd 5648static const struct ctl_table addrconf_sysctl[] = {
5df1f77f
KK		 5649 {
5650 .procname = "forwarding",
5651 .data = &ipv6_devconf.forwarding,
5652 .maxlen = sizeof(int),
5653 .mode = 0644,
5654 .proc_handler = addrconf_sysctl_forward,
5655 },
5656 {
5657 .procname = "hop_limit",
5658 .data = &ipv6_devconf.hop_limit,
5659 .maxlen = sizeof(int),
5660 .mode = 0644,
5661 .proc_handler = addrconf_sysctl_hop_limit,
5662 },
5663 {
5664 .procname = "mtu",
5665 .data = &ipv6_devconf.mtu6,
5666 .maxlen = sizeof(int),
5667 .mode = 0644,
5668 .proc_handler = addrconf_sysctl_mtu,
5669 },
5670 {
5671 .procname = "accept_ra",
5672 .data = &ipv6_devconf.accept_ra,
5673 .maxlen = sizeof(int),
5674 .mode = 0644,
5675 .proc_handler = proc_dointvec,
5676 },
5677 {
5678 .procname = "accept_redirects",
5679 .data = &ipv6_devconf.accept_redirects,
5680 .maxlen = sizeof(int),
5681 .mode = 0644,
5682 .proc_handler = proc_dointvec,
5683 },
5684 {
5685 .procname = "autoconf",
5686 .data = &ipv6_devconf.autoconf,
5687 .maxlen = sizeof(int),
5688 .mode = 0644,
5689 .proc_handler = proc_dointvec,
5690 },
5691 {
5692 .procname = "dad_transmits",
5693 .data = &ipv6_devconf.dad_transmits,
5694 .maxlen = sizeof(int),
5695 .mode = 0644,
5696 .proc_handler = proc_dointvec,
5697 },
5698 {
5699 .procname = "router_solicitations",
5700 .data = &ipv6_devconf.rtr_solicits,
5701 .maxlen = sizeof(int),
5702 .mode = 0644,
5703 .proc_handler = proc_dointvec,
5704 },
5705 {
5706 .procname = "router_solicitation_interval",
5707 .data = &ipv6_devconf.rtr_solicit_interval,
5708 .maxlen = sizeof(int),
5709 .mode = 0644,
5710 .proc_handler = proc_dointvec_jiffies,
5711 },
5712 {
5713 .procname = "router_solicitation_delay",
5714 .data = &ipv6_devconf.rtr_solicit_delay,
5715 .maxlen = sizeof(int),
5716 .mode = 0644,
5717 .proc_handler = proc_dointvec_jiffies,
5718 },
5719 {
5720 .procname = "force_mld_version",
5721 .data = &ipv6_devconf.force_mld_version,
5722 .maxlen = sizeof(int),
5723 .mode = 0644,
5724 .proc_handler = proc_dointvec,
5725 },
5726 {
5727 .procname = "mldv1_unsolicited_report_interval",
5728 .data =
5729 &ipv6_devconf.mldv1_unsolicited_report_interval,
5730 .maxlen = sizeof(int),
5731 .mode = 0644,
5732 .proc_handler = proc_dointvec_ms_jiffies,
5733 },
5734 {
5735 .procname = "mldv2_unsolicited_report_interval",
5736 .data =
5737 &ipv6_devconf.mldv2_unsolicited_report_interval,
5738 .maxlen = sizeof(int),
5739 .mode = 0644,
5740 .proc_handler = proc_dointvec_ms_jiffies,
5741 },
5742 {
5743 .procname = "use_tempaddr",
5744 .data = &ipv6_devconf.use_tempaddr,
5745 .maxlen = sizeof(int),
5746 .mode = 0644,
5747 .proc_handler = proc_dointvec,
5748 },
5749 {
5750 .procname = "temp_valid_lft",
5751 .data = &ipv6_devconf.temp_valid_lft,
5752 .maxlen = sizeof(int),
5753 .mode = 0644,
5754 .proc_handler = proc_dointvec,
5755 },
5756 {
5757 .procname = "temp_prefered_lft",
5758 .data = &ipv6_devconf.temp_prefered_lft,
5759 .maxlen = sizeof(int),
5760 .mode = 0644,
5761 .proc_handler = proc_dointvec,
5762 },
5763 {
5764 .procname = "regen_max_retry",
5765 .data = &ipv6_devconf.regen_max_retry,
5766 .maxlen = sizeof(int),
5767 .mode = 0644,
5768 .proc_handler = proc_dointvec,
5769 },
5770 {
5771 .procname = "max_desync_factor",
5772 .data = &ipv6_devconf.max_desync_factor,
5773 .maxlen = sizeof(int),
5774 .mode = 0644,
5775 .proc_handler = proc_dointvec,
5776 },
5777 {
5778 .procname = "max_addresses",
5779 .data = &ipv6_devconf.max_addresses,
5780 .maxlen = sizeof(int),
5781 .mode = 0644,
5782 .proc_handler = proc_dointvec,
5783 },
5784 {
5785 .procname = "accept_ra_defrtr",
5786 .data = &ipv6_devconf.accept_ra_defrtr,
5787 .maxlen = sizeof(int),
5788 .mode = 0644,
5789 .proc_handler = proc_dointvec,
5790 },
5791 {
5792 .procname = "accept_ra_min_hop_limit",
5793 .data = &ipv6_devconf.accept_ra_min_hop_limit,
5794 .maxlen = sizeof(int),
5795 .mode = 0644,
5796 .proc_handler = proc_dointvec,
5797 },
5798 {
5799 .procname = "accept_ra_pinfo",
5800 .data = &ipv6_devconf.accept_ra_pinfo,
5801 .maxlen = sizeof(int),
5802 .mode = 0644,
5803 .proc_handler = proc_dointvec,
5804 },
930d6ff2 5805#ifdef CONFIG_IPV6_ROUTER_PREF
5df1f77f
KK		 5806 {
5807 .procname = "accept_ra_rtr_pref",
5808 .data = &ipv6_devconf.accept_ra_rtr_pref,
5809 .maxlen = sizeof(int),
5810 .mode = 0644,
5811 .proc_handler = proc_dointvec,
5812 },
5813 {
5814 .procname = "router_probe_interval",
5815 .data = &ipv6_devconf.rtr_probe_interval,
5816 .maxlen = sizeof(int),
5817 .mode = 0644,
5818 .proc_handler = proc_dointvec_jiffies,
5819 },
fa03ef38 5820#ifdef CONFIG_IPV6_ROUTE_INFO
5df1f77f
KK		 5821 {
5822 .procname = "accept_ra_rt_info_max_plen",
5823 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
5824 .maxlen = sizeof(int),
5825 .mode = 0644,
5826 .proc_handler = proc_dointvec,
5827 },
09c884d4 5828#endif
930d6ff2 5829#endif
5df1f77f
KK		 5830 {
5831 .procname = "proxy_ndp",
5832 .data = &ipv6_devconf.proxy_ndp,
5833 .maxlen = sizeof(int),
5834 .mode = 0644,
5835 .proc_handler = addrconf_sysctl_proxy_ndp,
5836 },
5837 {
5838 .procname = "accept_source_route",
5839 .data = &ipv6_devconf.accept_source_route,
5840 .maxlen = sizeof(int),
5841 .mode = 0644,
5842 .proc_handler = proc_dointvec,
5843 },
95c385b4 5844#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
5df1f77f
KK		 5845 {
5846 .procname = "optimistic_dad",
5847 .data = &ipv6_devconf.optimistic_dad,
5848 .maxlen = sizeof(int),
5849 .mode = 0644,
5850 .proc_handler = proc_dointvec,
5851 },
5852 {
5853 .procname = "use_optimistic",
5854 .data = &ipv6_devconf.use_optimistic,
5855 .maxlen = sizeof(int),
5856 .mode = 0644,
5857 .proc_handler = proc_dointvec,
5858 },
7bc570c8
YH		 5859#endif
5860#ifdef CONFIG_IPV6_MROUTE
5df1f77f
KK		 5861 {
5862 .procname = "mc_forwarding",
5863 .data = &ipv6_devconf.mc_forwarding,
5864 .maxlen = sizeof(int),
5865 .mode = 0444,
5866 .proc_handler = proc_dointvec,
5867 },
95c385b4 5868#endif
5df1f77f
KK		 5869 {
5870 .procname = "disable_ipv6",
5871 .data = &ipv6_devconf.disable_ipv6,
5872 .maxlen = sizeof(int),
5873 .mode = 0644,
5874 .proc_handler = addrconf_sysctl_disable,
5875 },
5876 {
5877 .procname = "accept_dad",
5878 .data = &ipv6_devconf.accept_dad,
5879 .maxlen = sizeof(int),
5880 .mode = 0644,
5881 .proc_handler = proc_dointvec,
5882 },
5883 {
5884 .procname = "force_tllao",
5885 .data = &ipv6_devconf.force_tllao,
5886 .maxlen = sizeof(int),
5887 .mode = 0644,
5888 .proc_handler = proc_dointvec
5889 },
5890 {
5891 .procname = "ndisc_notify",
5892 .data = &ipv6_devconf.ndisc_notify,
5893 .maxlen = sizeof(int),
5894 .mode = 0644,
5895 .proc_handler = proc_dointvec
5896 },
5897 {
5898 .procname = "suppress_frag_ndisc",
5899 .data = &ipv6_devconf.suppress_frag_ndisc,
5900 .maxlen = sizeof(int),
5901 .mode = 0644,
5902 .proc_handler = proc_dointvec
5903 },
5904 {
5905 .procname = "accept_ra_from_local",
5906 .data = &ipv6_devconf.accept_ra_from_local,
5907 .maxlen = sizeof(int),
5908 .mode = 0644,
5909 .proc_handler = proc_dointvec,
5910 },
5911 {
5912 .procname = "accept_ra_mtu",
5913 .data = &ipv6_devconf.accept_ra_mtu,
5914 .maxlen = sizeof(int),
5915 .mode = 0644,
5916 .proc_handler = proc_dointvec,
5917 },
5918 {
5919 .procname = "stable_secret",
5920 .data = &ipv6_devconf.stable_secret,
5921 .maxlen = IPV6_MAX_STRLEN,
5922 .mode = 0600,
5923 .proc_handler = addrconf_sysctl_stable_secret,
5924 },
5925 {
5926 .procname = "use_oif_addrs_only",
5927 .data = &ipv6_devconf.use_oif_addrs_only,
5928 .maxlen = sizeof(int),
5929 .mode = 0644,
5930 .proc_handler = proc_dointvec,
5931 },
5932 {
5933 .procname = "ignore_routes_with_linkdown",
5934 .data = &ipv6_devconf.ignore_routes_with_linkdown,
5935 .maxlen = sizeof(int),
5936 .mode = 0644,
5937 .proc_handler = addrconf_sysctl_ignore_routes_with_linkdown,
5938 },
5939 {
5940 .procname = "drop_unicast_in_l2_multicast",
5941 .data = &ipv6_devconf.drop_unicast_in_l2_multicast,
5942 .maxlen = sizeof(int),
5943 .mode = 0644,
5944 .proc_handler = proc_dointvec,
5945 },
5946 {
5947 .procname = "drop_unsolicited_na",
5948 .data = &ipv6_devconf.drop_unsolicited_na,
5949 .maxlen = sizeof(int),
5950 .mode = 0644,
5951 .proc_handler = proc_dointvec,
5952 },
5953 {
5954 .procname = "keep_addr_on_down",
5955 .data = &ipv6_devconf.keep_addr_on_down,
5956 .maxlen = sizeof(int),
5957 .mode = 0644,
5958 .proc_handler = proc_dointvec,
5959
5960 },
5961 {
5962 /* sentinel */
5963 }
1da177e4
LT		 5964};
5965
bff16c2f 5966static int __addrconf_sysctl_register(struct net *net, char *dev_name,
f8572d8f 5967 struct inet6_dev *idev, struct ipv6_devconf *p)
1da177e4
LT		 5968{
5969 int i;
607ea7cd 5970 struct ctl_table *table;
6105e293 5971 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ];
1dab6222 5972
607ea7cd
KK		 5973 table = kmemdup(addrconf_sysctl, sizeof(addrconf_sysctl), GFP_KERNEL);
5974 if (!table)
f68635e6
PE		 5975 goto out;
5976
607ea7cd
KK		 5977 for (i = 0; table[i].data; i++) {
5978 table[i].data += (char *)p - (char *)&ipv6_devconf;
5979 table[i].extra1 = idev; /* embedded; no ref */
5980 table[i].extra2 = net;
1da177e4 5981 }
1da177e4 5982
6105e293 5983 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name);
1da177e4 5984
607ea7cd
KK		 5985 p->sysctl_header = register_net_sysctl(net, path, table);
5986 if (!p->sysctl_header)
6105e293 5987 goto free;
f68635e6 5988
95897312 5989 return 0;
1da177e4 5990
f68635e6 5991free:
607ea7cd 5992 kfree(table);
f68635e6 5993out:
95897312 5994 return -ENOBUFS;
1da177e4
LT		 5995}
5996
408c4768
PE		 5997static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
5998{
607ea7cd 5999 struct ctl_table *table;
408c4768 6000
607ea7cd 6001 if (!p->sysctl_header)
408c4768
PE		 6002 return;
6003
607ea7cd
KK		 6004 table = p->sysctl_header->ctl_table_arg;
6005 unregister_net_sysctl_table(p->sysctl_header);
6006 p->sysctl_header = NULL;
6007 kfree(table);
408c4768
PE		 6008}
6009
a317a2f1 6010static int addrconf_sysctl_register(struct inet6_dev *idev)
f52295a9 6011{
a317a2f1
WC		 6012 int err;
6013
6014 if (!sysctl_dev_name_is_allowed(idev->dev->name))
6015 return -EINVAL;
6016
6017 err = neigh_sysctl_register(idev->dev, idev->nd_parms,
6018 &ndisc_ifinfo_sysctl_change);
6019 if (err)
6020 return err;
6021 err = __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
6022 idev, &idev->cnf);
6023 if (err)
6024 neigh_sysctl_unregister(idev->nd_parms);
6025
6026 return err;
f52295a9
PE		 6027}
6028
408c4768 6029static void addrconf_sysctl_unregister(struct inet6_dev *idev)
1da177e4 6030{
408c4768
PE		 6031 __addrconf_sysctl_unregister(&idev->cnf);
6032 neigh_sysctl_unregister(idev->nd_parms);
1da177e4
LT		 6033}
6034
6035
6036#endif
6037
2c8c1e72 6038static int __net_init addrconf_init_net(struct net *net)
e0da5a48 6039{
a79ca223 6040 int err = -ENOMEM;
e0da5a48
PE		 6041 struct ipv6_devconf *all, *dflt;
6042
a79ca223 6043 all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL);
63159f29 6044 if (!all)
a79ca223 6045 goto err_alloc_all;
e0da5a48 6046
a79ca223 6047 dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
63159f29 6048 if (!dflt)
a79ca223 6049 goto err_alloc_dflt;
e0da5a48 6050
a79ca223
HZ		 6051 /* these will be inherited by all namespaces */
6052 dflt->autoconf = ipv6_defaults.autoconf;
6053 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
e0da5a48 6054
3d1bec99
HFS		 6055 dflt->stable_secret.initialized = false;
6056 all->stable_secret.initialized = false;
6057
e0da5a48
PE		 6058 net->ipv6.devconf_all = all;
6059 net->ipv6.devconf_dflt = dflt;
6060
6061#ifdef CONFIG_SYSCTL
f8572d8f 6062 err = __addrconf_sysctl_register(net, "all", NULL, all);
e0da5a48
PE		 6063 if (err < 0)
6064 goto err_reg_all;
6065
f8572d8f 6066 err = __addrconf_sysctl_register(net, "default", NULL, dflt);
e0da5a48
PE		 6067 if (err < 0)
6068 goto err_reg_dflt;
6069#endif
6070 return 0;
6071
6072#ifdef CONFIG_SYSCTL
6073err_reg_dflt:
6074 __addrconf_sysctl_unregister(all);
6075err_reg_all:
6076 kfree(dflt);
6077#endif
6078err_alloc_dflt:
6079 kfree(all);
6080err_alloc_all:
6081 return err;
6082}
6083
2c8c1e72 6084static void __net_exit addrconf_exit_net(struct net *net)
e0da5a48
PE		 6085{
6086#ifdef CONFIG_SYSCTL
6087 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
6088 __addrconf_sysctl_unregister(net->ipv6.devconf_all);
6089#endif
73cf0e92 6090 kfree(net->ipv6.devconf_dflt);
6091 kfree(net->ipv6.devconf_all);
e0da5a48
PE		 6092}
6093
6094static struct pernet_operations addrconf_ops = {
6095 .init = addrconf_init_net,
6096 .exit = addrconf_exit_net,
6097};
6098
207895fd 6099static struct rtnl_af_ops inet6_ops __read_mostly = {
b382b191
TG		 6100 .family = AF_INET6,
6101 .fill_link_af = inet6_fill_link_af,
6102 .get_link_af_size = inet6_get_link_af_size,
11b1f828 6103 .validate_link_af = inet6_validate_link_af,
f53adae4 6104 .set_link_af = inet6_set_link_af,
b382b191
TG		 6105};
6106
1da177e4
LT		 6107/*
6108 * Init / cleanup code
6109 */
6110
6111int __init addrconf_init(void)
6112{
a317a2f1 6113 struct inet6_dev *idev;
c2e21293 6114 int i, err;
2a8cc6c8 6115
e21e8467
SH		 6116 err = ipv6_addr_label_init();
6117 if (err < 0) {
f3213831
JP		 6118 pr_crit("%s: cannot initialize default policy table: %d\n",
6119 __func__, err);
2cc6d2bf 6120 goto out;
2a8cc6c8 6121 }
1da177e4 6122
2cc6d2bf
NH		 6123 err = register_pernet_subsys(&addrconf_ops);
6124 if (err < 0)
6125 goto out_addrlabel;
e0da5a48 6126
c15b1cca
HFS		 6127 addrconf_wq = create_workqueue("ipv6_addrconf");
6128 if (!addrconf_wq) {
6129 err = -ENOMEM;
6130 goto out_nowq;
6131 }
6132
1da177e4
LT		 6133 /* The addrconf netdev notifier requires that loopback_dev
6134 * has it's ipv6 private information allocated and setup
6135 * before it can bring up and give link-local addresses
6136 * to other devices which are up.
6137 *
6138 * Unfortunately, loopback_dev is not necessarily the first
6139 * entry in the global dev_base list of net devices. In fact,
6140 * it is likely to be the very last entry on that list.
6141 * So this causes the notifier registry below to try and
6142 * give link-local addresses to all devices besides loopback_dev
6143 * first, then loopback_dev, which cases all the non-loopback_dev
6144 * devices to fail to get a link-local address.
6145 *
6146 * So, as a temporary fix, allocate the ipv6 structure for
6147 * loopback_dev first by hand.
6148 * Longer term, all of the dependencies ipv6 has upon the loopback
6149 * device and it being up should be removed.
6150 */
6151 rtnl_lock();
a317a2f1 6152 idev = ipv6_add_dev(init_net.loopback_dev);
1da177e4 6153 rtnl_unlock();
a317a2f1
WC		 6154 if (IS_ERR(idev)) {
6155 err = PTR_ERR(idev);
e0da5a48 6156 goto errlo;
a317a2f1 6157 }
1da177e4 6158
c2e21293 6159 for (i = 0; i < IN6_ADDR_HSIZE; i++)
6160 INIT_HLIST_HEAD(&inet6_addr_lst[i]);
6161
1da177e4
LT		 6162 register_netdevice_notifier(&ipv6_dev_notf);
6163
c15b1cca 6164 addrconf_verify();
c127ea2c 6165
3678a9d8 6166 rtnl_af_register(&inet6_ops);
b382b191 6167
c7ac8679
GR		 6168 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo,
6169 NULL);
c127ea2c
TG		 6170 if (err < 0)
6171 goto errout;
6172
6173 /* Only the first call to __rtnl_register can fail */
c7ac8679
GR		 6174 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL, NULL);
6175 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL, NULL);
6176 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr,
6177 inet6_dump_ifaddr, NULL);
6178 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL,
6179 inet6_dump_ifmcaddr, NULL);
6180 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL,
6181 inet6_dump_ifacaddr, NULL);
76f8f6cb 6182 __rtnl_register(PF_INET6, RTM_GETNETCONF, inet6_netconf_get_devconf,
7a674200 6183 inet6_netconf_dump_devconf, NULL);
c127ea2c 6184
2a8cc6c8
YH		 6185 ipv6_addr_label_rtnl_register();
6186
1da177e4 6187 return 0;
c127ea2c 6188errout:
b382b191 6189 rtnl_af_unregister(&inet6_ops);
c127ea2c 6190 unregister_netdevice_notifier(&ipv6_dev_notf);
e0da5a48 6191errlo:
c15b1cca
HFS		 6192 destroy_workqueue(addrconf_wq);
6193out_nowq:
e0da5a48 6194 unregister_pernet_subsys(&addrconf_ops);
2cc6d2bf
NH		 6195out_addrlabel:
6196 ipv6_addr_label_cleanup();
6197out:
c127ea2c 6198 return err;
1da177e4
LT		 6199}
6200
09f7709f 6201void addrconf_cleanup(void)
1da177e4 6202{
176c39af 6203 struct net_device *dev;
1da177e4
LT		 6204 int i;
6205
6206 unregister_netdevice_notifier(&ipv6_dev_notf);
e0da5a48 6207 unregister_pernet_subsys(&addrconf_ops);
2cc6d2bf 6208 ipv6_addr_label_cleanup();
1da177e4
LT		 6209
6210 rtnl_lock();
6211
b382b191
TG		 6212 __rtnl_af_unregister(&inet6_ops);
6213
176c39af
DL		 6214 /* clean dev list */
6215 for_each_netdev(&init_net, dev) {
6216 if (__in6_dev_get(dev) == NULL)
6217 continue;
6218 addrconf_ifdown(dev, 1);
6219 }
6220 addrconf_ifdown(init_net.loopback_dev, 2);
6221
1da177e4
LT		 6222 /*
6223 * Check hash table.
6224 */
5c578aed 6225 spin_lock_bh(&addrconf_hash_lock);
c2e21293 6226 for (i = 0; i < IN6_ADDR_HSIZE; i++)
6227 WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
5c578aed 6228 spin_unlock_bh(&addrconf_hash_lock);
c15b1cca 6229 cancel_delayed_work(&addr_chk_work);
1da177e4 6230 rtnl_unlock();
c15b1cca
HFS		 6231
6232 destroy_workqueue(addrconf_wq);
1da177e4 6233}
Ubuntu Artful kernel mirror