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Revert "ipv6: Revert optional address flusing on ifdown."
[deliverable/linux.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,
6a923934 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,
6a923934 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
IO		 361 ndev->cnf.mtu6 = dev->mtu;
362 ndev->cnf.sysctl = NULL;
363 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
63159f29 364 if (!ndev->nd_parms) {
322f74a4 365 kfree(ndev);
a317a2f1 366 return ERR_PTR(err);
322f74a4 367 }
0187bdfb
BH		 368 if (ndev->cnf.forwarding)
369 dev_disable_lro(dev);
322f74a4
IO		 370 /* We refer to the device */
371 dev_hold(dev);
1da177e4 372
322f74a4 373 if (snmp6_alloc_dev(ndev) < 0) {
ba3542e1 374 ADBG(KERN_WARNING
f3213831 375 "%s: cannot allocate memory for statistics; dev=%s.\n",
ba3542e1 376 __func__, dev->name);
322f74a4 377 neigh_parms_release(&nd_tbl, ndev->nd_parms);
8603e33d
RL		 378 dev_put(dev);
379 kfree(ndev);
a317a2f1 380 return ERR_PTR(err);
322f74a4 381 }
1da177e4 382
322f74a4 383 if (snmp6_register_dev(ndev) < 0) {
ba3542e1 384 ADBG(KERN_WARNING
f3213831 385 "%s: cannot create /proc/net/dev_snmp6/%s\n",
ba3542e1 386 __func__, dev->name);
a317a2f1 387 goto err_release;
322f74a4
IO		 388 }
389
390 /* One reference from device. We must do this before
391 * we invoke __ipv6_regen_rndid().
392 */
393 in6_dev_hold(ndev);
1da177e4 394
1b34be74
YH		 395 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
396 ndev->cnf.accept_dad = -1;
397
07a93626 398#if IS_ENABLED(CONFIG_IPV6_SIT)
b077d7ab 399 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
f3213831 400 pr_info("%s: Disabled Multicast RS\n", dev->name);
b077d7ab
YH		 401 ndev->cnf.rtr_solicits = 0;
402 }
403#endif
404
372e6c8f 405 INIT_LIST_HEAD(&ndev->tempaddr_list);
b24b8a24 406 setup_timer(&ndev->regen_timer, ipv6_regen_rndid, (unsigned long)ndev);
322f74a4
IO		 407 if ((dev->flags&IFF_LOOPBACK) ||
408 dev->type == ARPHRD_TUNNEL ||
9625ed72 409 dev->type == ARPHRD_TUNNEL6 ||
0be669bb 410 dev->type == ARPHRD_SIT ||
0be669bb 411 dev->type == ARPHRD_NONE) {
322f74a4
IO		 412 ndev->cnf.use_tempaddr = -1;
413 } else {
414 in6_dev_hold(ndev);
415 ipv6_regen_rndid((unsigned long) ndev);
416 }
5d9efa7e 417
914faa14 418 ndev->token = in6addr_any;
1da177e4 419
f24e3d65 420 if (netif_running(dev) && addrconf_qdisc_ok(dev))
53aadcc9
HX		 421 ndev->if_flags |= IF_READY;
422
322f74a4
IO		 423 ipv6_mc_init_dev(ndev);
424 ndev->tstamp = jiffies;
a317a2f1
WC		 425 err = addrconf_sysctl_register(ndev);
426 if (err) {
427 ipv6_mc_destroy_dev(ndev);
428 del_timer(&ndev->regen_timer);
2a189f9e 429 snmp6_unregister_dev(ndev);
a317a2f1
WC		 430 goto err_release;
431 }
30c4cf57 432 /* protected by rtnl_lock */
cf778b00 433 rcu_assign_pointer(dev->ip6_ptr, ndev);
d88ae4cc 434
2c5e8933
HFS		 435 /* Join interface-local all-node multicast group */
436 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allnodes);
437
d88ae4cc 438 /* Join all-node multicast group */
f3ee4010 439 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);
d88ae4cc 440
d6ddef9e 441 /* Join all-router multicast group if forwarding is set */
8b2aaede 442 if (ndev->cnf.forwarding && (dev->flags & IFF_MULTICAST))
d6ddef9e
LW		 443 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
444
1da177e4 445 return ndev;
a317a2f1
WC		 446
447err_release:
448 neigh_parms_release(&nd_tbl, ndev->nd_parms);
449 ndev->dead = 1;
450 in6_dev_finish_destroy(ndev);
451 return ERR_PTR(err);
1da177e4
LT		 452}
453
8e5e8f30 454static struct inet6_dev *ipv6_find_idev(struct net_device *dev)
1da177e4
LT		 455{
456 struct inet6_dev *idev;
457
458 ASSERT_RTNL();
459
e21e8467
SH		 460 idev = __in6_dev_get(dev);
461 if (!idev) {
462 idev = ipv6_add_dev(dev);
a317a2f1 463 if (IS_ERR(idev))
1da177e4
LT		 464 return NULL;
465 }
c5e33bdd 466
1da177e4
LT		 467 if (dev->flags&IFF_UP)
468 ipv6_mc_up(idev);
469 return idev;
470}
471
f3a1bfb1
ND		 472static int inet6_netconf_msgsize_devconf(int type)
473{
474 int size = NLMSG_ALIGN(sizeof(struct netconfmsg))
475 + nla_total_size(4); /* NETCONFA_IFINDEX */
136ba622 476 bool all = false;
f3a1bfb1 477
136ba622
ZS		 478 if (type == NETCONFA_ALL)
479 all = true;
480
481 if (all || type == NETCONFA_FORWARDING)
f3a1bfb1 482 size += nla_total_size(4);
b1afce95 483#ifdef CONFIG_IPV6_MROUTE
136ba622 484 if (all || type == NETCONFA_MC_FORWARDING)
d67b8c61 485 size += nla_total_size(4);
b1afce95 486#endif
136ba622 487 if (all || type == NETCONFA_PROXY_NEIGH)
c92d5491 488 size += nla_total_size(4);
f3a1bfb1 489
136ba622 490 if (all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN)
35103d11
AG		 491 size += nla_total_size(4);
492
f3a1bfb1
ND		 493 return size;
494}
495
496static int inet6_netconf_fill_devconf(struct sk_buff *skb, int ifindex,
497 struct ipv6_devconf *devconf, u32 portid,
498 u32 seq, int event, unsigned int flags,
499 int type)
500{
501 struct nlmsghdr *nlh;
502 struct netconfmsg *ncm;
136ba622 503 bool all = false;
f3a1bfb1
ND		 504
505 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg),
506 flags);
63159f29 507 if (!nlh)
f3a1bfb1
ND		 508 return -EMSGSIZE;
509
136ba622
ZS		 510 if (type == NETCONFA_ALL)
511 all = true;
512
f3a1bfb1
ND		 513 ncm = nlmsg_data(nlh);
514 ncm->ncm_family = AF_INET6;
515
516 if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0)
517 goto nla_put_failure;
518
136ba622 519 if ((all || type == NETCONFA_FORWARDING) &&
f3a1bfb1
ND		 520 nla_put_s32(skb, NETCONFA_FORWARDING, devconf->forwarding) < 0)
521 goto nla_put_failure;
b1afce95 522#ifdef CONFIG_IPV6_MROUTE
136ba622 523 if ((all || type == NETCONFA_MC_FORWARDING) &&
d67b8c61
ND		 524 nla_put_s32(skb, NETCONFA_MC_FORWARDING,
525 devconf->mc_forwarding) < 0)
526 goto nla_put_failure;
b1afce95 527#endif
136ba622 528 if ((all || type == NETCONFA_PROXY_NEIGH) &&
c92d5491 529 nla_put_s32(skb, NETCONFA_PROXY_NEIGH, devconf->proxy_ndp) < 0)
530 goto nla_put_failure;
531
136ba622 532 if ((all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN) &&
35103d11
AG		 533 nla_put_s32(skb, NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
534 devconf->ignore_routes_with_linkdown) < 0)
535 goto nla_put_failure;
536
053c095a
JB		 537 nlmsg_end(skb, nlh);
538 return 0;
f3a1bfb1
ND		 539
540nla_put_failure:
541 nlmsg_cancel(skb, nlh);
542 return -EMSGSIZE;
543}
544
d67b8c61
ND		 545void inet6_netconf_notify_devconf(struct net *net, int type, int ifindex,
546 struct ipv6_devconf *devconf)
f3a1bfb1
ND		 547{
548 struct sk_buff *skb;
549 int err = -ENOBUFS;
550
551 skb = nlmsg_new(inet6_netconf_msgsize_devconf(type), GFP_ATOMIC);
63159f29 552 if (!skb)
f3a1bfb1
ND		 553 goto errout;
554
555 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 0, 0,
556 RTM_NEWNETCONF, 0, type);
557 if (err < 0) {
558 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
559 WARN_ON(err == -EMSGSIZE);
560 kfree_skb(skb);
561 goto errout;
562 }
563 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_NETCONF, NULL, GFP_ATOMIC);
564 return;
565errout:
bd779028 566 rtnl_set_sk_err(net, RTNLGRP_IPV6_NETCONF, err);
f3a1bfb1
ND		 567}
568
76f8f6cb
ND		 569static const struct nla_policy devconf_ipv6_policy[NETCONFA_MAX+1] = {
570 [NETCONFA_IFINDEX] = { .len = sizeof(int) },
571 [NETCONFA_FORWARDING] = { .len = sizeof(int) },
c92d5491 572 [NETCONFA_PROXY_NEIGH] = { .len = sizeof(int) },
35103d11 573 [NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN] = { .len = sizeof(int) },
76f8f6cb
ND		 574};
575
576static int inet6_netconf_get_devconf(struct sk_buff *in_skb,
661d2967 577 struct nlmsghdr *nlh)
76f8f6cb
ND		 578{
579 struct net *net = sock_net(in_skb->sk);
580 struct nlattr *tb[NETCONFA_MAX+1];
581 struct netconfmsg *ncm;
582 struct sk_buff *skb;
583 struct ipv6_devconf *devconf;
584 struct inet6_dev *in6_dev;
585 struct net_device *dev;
586 int ifindex;
587 int err;
588
589 err = nlmsg_parse(nlh, sizeof(*ncm), tb, NETCONFA_MAX,
590 devconf_ipv6_policy);
591 if (err < 0)
592 goto errout;
593
a97eb33f 594 err = -EINVAL;
76f8f6cb
ND		 595 if (!tb[NETCONFA_IFINDEX])
596 goto errout;
597
598 ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]);
599 switch (ifindex) {
600 case NETCONFA_IFINDEX_ALL:
601 devconf = net->ipv6.devconf_all;
602 break;
603 case NETCONFA_IFINDEX_DEFAULT:
604 devconf = net->ipv6.devconf_dflt;
605 break;
606 default:
607 dev = __dev_get_by_index(net, ifindex);
63159f29 608 if (!dev)
76f8f6cb
ND		 609 goto errout;
610 in6_dev = __in6_dev_get(dev);
63159f29 611 if (!in6_dev)
76f8f6cb
ND		 612 goto errout;
613 devconf = &in6_dev->cnf;
614 break;
615 }
616
617 err = -ENOBUFS;
136ba622 618 skb = nlmsg_new(inet6_netconf_msgsize_devconf(NETCONFA_ALL), GFP_ATOMIC);
63159f29 619 if (!skb)
76f8f6cb
ND		 620 goto errout;
621
622 err = inet6_netconf_fill_devconf(skb, ifindex, devconf,
623 NETLINK_CB(in_skb).portid,
624 nlh->nlmsg_seq, RTM_NEWNETCONF, 0,
136ba622 625 NETCONFA_ALL);
76f8f6cb
ND		 626 if (err < 0) {
627 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
628 WARN_ON(err == -EMSGSIZE);
629 kfree_skb(skb);
630 goto errout;
631 }
632 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
633errout:
634 return err;
635}
636
7a674200
ND		 637static int inet6_netconf_dump_devconf(struct sk_buff *skb,
638 struct netlink_callback *cb)
639{
640 struct net *net = sock_net(skb->sk);
641 int h, s_h;
642 int idx, s_idx;
643 struct net_device *dev;
644 struct inet6_dev *idev;
645 struct hlist_head *head;
646
647 s_h = cb->args[0];
648 s_idx = idx = cb->args[1];
649
650 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
651 idx = 0;
652 head = &net->dev_index_head[h];
653 rcu_read_lock();
63998ac2
ND		 654 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^
655 net->dev_base_seq;
7a674200
ND		 656 hlist_for_each_entry_rcu(dev, head, index_hlist) {
657 if (idx < s_idx)
658 goto cont;
659 idev = __in6_dev_get(dev);
660 if (!idev)
661 goto cont;
662
663 if (inet6_netconf_fill_devconf(skb, dev->ifindex,
664 &idev->cnf,
665 NETLINK_CB(cb->skb).portid,
666 cb->nlh->nlmsg_seq,
667 RTM_NEWNETCONF,
668 NLM_F_MULTI,
136ba622 669 NETCONFA_ALL) < 0) {
7a674200
ND		 670 rcu_read_unlock();
671 goto done;
672 }
63998ac2 673 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
7a674200
ND		 674cont:
675 idx++;
676 }
677 rcu_read_unlock();
678 }
679 if (h == NETDEV_HASHENTRIES) {
680 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL,
681 net->ipv6.devconf_all,
682 NETLINK_CB(cb->skb).portid,
683 cb->nlh->nlmsg_seq,
684 RTM_NEWNETCONF, NLM_F_MULTI,
136ba622 685 NETCONFA_ALL) < 0)
7a674200
ND		 686 goto done;
687 else
688 h++;
689 }
690 if (h == NETDEV_HASHENTRIES + 1) {
691 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT,
692 net->ipv6.devconf_dflt,
693 NETLINK_CB(cb->skb).portid,
694 cb->nlh->nlmsg_seq,
695 RTM_NEWNETCONF, NLM_F_MULTI,
136ba622 696 NETCONFA_ALL) < 0)
7a674200
ND		 697 goto done;
698 else
699 h++;
700 }
701done:
702 cb->args[0] = h;
703 cb->args[1] = idx;
704
705 return skb->len;
706}
707
1da177e4
LT		 708#ifdef CONFIG_SYSCTL
709static void dev_forward_change(struct inet6_dev *idev)
710{
711 struct net_device *dev;
712 struct inet6_ifaddr *ifa;
1da177e4
LT		 713
714 if (!idev)
715 return;
716 dev = idev->dev;
0187bdfb
BH		 717 if (idev->cnf.forwarding)
718 dev_disable_lro(dev);
1a940835 719 if (dev->flags & IFF_MULTICAST) {
2c5e8933 720 if (idev->cnf.forwarding) {
f3ee4010 721 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
2c5e8933
HFS		 722 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allrouters);
723 ipv6_dev_mc_inc(dev, &in6addr_sitelocal_allrouters);
724 } else {
f3ee4010 725 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
2c5e8933
HFS		 726 ipv6_dev_mc_dec(dev, &in6addr_interfacelocal_allrouters);
727 ipv6_dev_mc_dec(dev, &in6addr_sitelocal_allrouters);
728 }
1da177e4 729 }
502a2ffd 730
731 list_for_each_entry(ifa, &idev->addr_list, if_list) {
2c12a74c
MW		 732 if (ifa->flags&IFA_F_TENTATIVE)
733 continue;
1da177e4
LT		 734 if (idev->cnf.forwarding)
735 addrconf_join_anycast(ifa);
736 else
737 addrconf_leave_anycast(ifa);
738 }
f3a1bfb1
ND		 739 inet6_netconf_notify_devconf(dev_net(dev), NETCONFA_FORWARDING,
740 dev->ifindex, &idev->cnf);
1da177e4
LT		 741}
742
743
e186932b 744static void addrconf_forward_change(struct net *net, __s32 newf)
1da177e4
LT		 745{
746 struct net_device *dev;
747 struct inet6_dev *idev;
748
4acd4945 749 for_each_netdev(net, dev) {
1da177e4
LT		 750 idev = __in6_dev_get(dev);
751 if (idev) {
e186932b
PE		 752 int changed = (!idev->cnf.forwarding) ^ (!newf);
753 idev->cnf.forwarding = newf;
1da177e4
LT		 754 if (changed)
755 dev_forward_change(idev);
756 }
1da177e4 757 }
1da177e4 758}
c8fecf22 759
013d97e9 760static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf)
c8fecf22 761{
bff16c2f 762 struct net *net;
013d97e9
FR		 763 int old;
764
765 if (!rtnl_trylock())
766 return restart_syscall();
bff16c2f
PE		 767
768 net = (struct net *)table->extra2;
013d97e9
FR		 769 old = *p;
770 *p = newf;
b325fddb 771
013d97e9 772 if (p == &net->ipv6.devconf_dflt->forwarding) {
f3a1bfb1
ND		 773 if ((!newf) ^ (!old))
774 inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING,
775 NETCONFA_IFINDEX_DEFAULT,
776 net->ipv6.devconf_dflt);
013d97e9
FR		 777 rtnl_unlock();
778 return 0;
88af182e 779 }
c8fecf22 780
e186932b 781 if (p == &net->ipv6.devconf_all->forwarding) {
e186932b
PE		 782 net->ipv6.devconf_dflt->forwarding = newf;
783 addrconf_forward_change(net, newf);
f3a1bfb1
ND		 784 if ((!newf) ^ (!old))
785 inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING,
786 NETCONFA_IFINDEX_ALL,
787 net->ipv6.devconf_all);
013d97e9 788 } else if ((!newf) ^ (!old))
c8fecf22 789 dev_forward_change((struct inet6_dev *)table->extra1);
0187bdfb 790 rtnl_unlock();
c8fecf22 791
013d97e9 792 if (newf)
7b4da532 793 rt6_purge_dflt_routers(net);
b325fddb 794 return 1;
c8fecf22 795}
35103d11
AG		 796
797static void addrconf_linkdown_change(struct net *net, __s32 newf)
798{
799 struct net_device *dev;
800 struct inet6_dev *idev;
801
802 for_each_netdev(net, dev) {
803 idev = __in6_dev_get(dev);
804 if (idev) {
805 int changed = (!idev->cnf.ignore_routes_with_linkdown) ^ (!newf);
806
807 idev->cnf.ignore_routes_with_linkdown = newf;
808 if (changed)
809 inet6_netconf_notify_devconf(dev_net(dev),
810 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
811 dev->ifindex,
812 &idev->cnf);
813 }
814 }
815}
816
817static int addrconf_fixup_linkdown(struct ctl_table *table, int *p, int newf)
818{
819 struct net *net;
820 int old;
821
822 if (!rtnl_trylock())
823 return restart_syscall();
824
825 net = (struct net *)table->extra2;
826 old = *p;
827 *p = newf;
828
829 if (p == &net->ipv6.devconf_dflt->ignore_routes_with_linkdown) {
830 if ((!newf) ^ (!old))
831 inet6_netconf_notify_devconf(net,
832 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
833 NETCONFA_IFINDEX_DEFAULT,
834 net->ipv6.devconf_dflt);
835 rtnl_unlock();
836 return 0;
837 }
838
839 if (p == &net->ipv6.devconf_all->ignore_routes_with_linkdown) {
840 net->ipv6.devconf_dflt->ignore_routes_with_linkdown = newf;
841 addrconf_linkdown_change(net, newf);
842 if ((!newf) ^ (!old))
843 inet6_netconf_notify_devconf(net,
844 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
845 NETCONFA_IFINDEX_ALL,
846 net->ipv6.devconf_all);
847 }
848 rtnl_unlock();
849
850 return 1;
851}
852
1da177e4
LT		 853#endif
854
5c578aed 855/* Nobody refers to this ifaddr, destroy it */
1da177e4
LT		 856void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
857{
c2e21293 858 WARN_ON(!hlist_unhashed(&ifp->addr_lst));
547b792c 859
1da177e4 860#ifdef NET_REFCNT_DEBUG
91df42be 861 pr_debug("%s\n", __func__);
1da177e4
LT		 862#endif
863
864 in6_dev_put(ifp->idev);
865
c15b1cca
HFS		 866 if (cancel_delayed_work(&ifp->dad_work))
867 pr_notice("delayed DAD work was pending while freeing ifa=%p\n",
868 ifp);
1da177e4 869
e9d3e084 870 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
f3213831 871 pr_warn("Freeing alive inet6 address %p\n", ifp);
1da177e4
LT		 872 return;
873 }
94e187c0 874 ip6_rt_put(ifp->rt);
1da177e4 875
e5785985 876 kfree_rcu(ifp, rcu);
1da177e4
LT		 877}
878
e55ffac6
BH		 879static void
880ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
881{
502a2ffd 882 struct list_head *p;
8a6ce0c0 883 int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
e55ffac6
BH		 884
885 /*
886 * Each device address list is sorted in order of scope -
887 * global before linklocal.
888 */
502a2ffd 889 list_for_each(p, &idev->addr_list) {
890 struct inet6_ifaddr *ifa
891 = list_entry(p, struct inet6_ifaddr, if_list);
8a6ce0c0 892 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
e55ffac6
BH		 893 break;
894 }
895
b54c9b98 896 list_add_tail(&ifp->if_list, p);
e55ffac6
BH		 897}
898
ddbe5032 899static u32 inet6_addr_hash(const struct in6_addr *addr)
3eb84f49 900{
ddbe5032 901 return hash_32(ipv6_addr_hash(addr), IN6_ADDR_HSIZE_SHIFT);
3eb84f49
YH		 902}
903
1da177e4
LT		 904/* On success it returns ifp with increased reference count */
905
906static struct inet6_ifaddr *
3f8f5298
JP		 907ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
908 const struct in6_addr *peer_addr, int pfxlen,
8a226b2c 909 int scope, u32 flags, u32 valid_lft, u32 prefered_lft)
1da177e4
LT		 910{
911 struct inet6_ifaddr *ifa = NULL;
912 struct rt6_info *rt;
3a88a81d 913 unsigned int hash;
1da177e4 914 int err = 0;
d68b8270
YH		 915 int addr_type = ipv6_addr_type(addr);
916
917 if (addr_type == IPV6_ADDR_ANY ||
918 addr_type & IPV6_ADDR_MULTICAST ||
919 (!(idev->dev->flags & IFF_LOOPBACK) &&
920 addr_type & IPV6_ADDR_LOOPBACK))
921 return ERR_PTR(-EADDRNOTAVAIL);
1da177e4 922
8814c4b5 923 rcu_read_lock_bh();
1da177e4
LT		 924 if (idev->dead) {
925 err = -ENODEV; /*XXX*/
926 goto out2;
927 }
928
56d417b1 929 if (idev->cnf.disable_ipv6) {
9bdd8d40
BH		 930 err = -EACCES;
931 goto out2;
932 }
933
5c578aed 934 spin_lock(&addrconf_hash_lock);
1da177e4
LT		 935
936 /* Ignore adding duplicate addresses on an interface */
c346dca1 937 if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) {
ba3542e1 938 ADBG("ipv6_add_addr: already assigned\n");
1da177e4
LT		 939 err = -EEXIST;
940 goto out;
941 }
942
322f74a4 943 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
1da177e4 944
63159f29 945 if (!ifa) {
ba3542e1 946 ADBG("ipv6_add_addr: malloc failed\n");
1da177e4
LT		 947 err = -ENOBUFS;
948 goto out;
949 }
950
8f031519 951 rt = addrconf_dst_alloc(idev, addr, false);
1da177e4
LT		 952 if (IS_ERR(rt)) {
953 err = PTR_ERR(rt);
954 goto out;
955 }
956
bba24896
JP		 957 neigh_parms_data_state_setall(idev->nd_parms);
958
4e3fd7a0 959 ifa->addr = *addr;
3f8f5298
JP		 960 if (peer_addr)
961 ifa->peer_addr = *peer_addr;
1da177e4
LT		 962
963 spin_lock_init(&ifa->lock);
c15b1cca 964 INIT_DELAYED_WORK(&ifa->dad_work, addrconf_dad_work);
c2e21293 965 INIT_HLIST_NODE(&ifa->addr_lst);
1da177e4
LT		 966 ifa->scope = scope;
967 ifa->prefix_len = pfxlen;
968 ifa->flags = flags | IFA_F_TENTATIVE;
8a226b2c
JB		 969 ifa->valid_lft = valid_lft;
970 ifa->prefered_lft = prefered_lft;
1da177e4 971 ifa->cstamp = ifa->tstamp = jiffies;
617fe29d 972 ifa->tokenized = false;
1da177e4 973
57f5f544
KF		 974 ifa->rt = rt;
975
1da177e4
LT		 976 ifa->idev = idev;
977 in6_dev_hold(idev);
978 /* For caller */
979 in6_ifa_hold(ifa);
980
981 /* Add to big hash table */
ddbe5032 982 hash = inet6_addr_hash(addr);
1da177e4 983
5c578aed 984 hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]);
5c578aed 985 spin_unlock(&addrconf_hash_lock);
1da177e4
LT		 986
987 write_lock(&idev->lock);
988 /* Add to inet6_dev unicast addr list. */
e55ffac6 989 ipv6_link_dev_addr(idev, ifa);
1da177e4 990
1da177e4 991 if (ifa->flags&IFA_F_TEMPORARY) {
372e6c8f 992 list_add(&ifa->tmp_list, &idev->tempaddr_list);
1da177e4
LT		 993 in6_ifa_hold(ifa);
994 }
1da177e4 995
1da177e4
LT		 996 in6_ifa_hold(ifa);
997 write_unlock(&idev->lock);
998out2:
8814c4b5 999 rcu_read_unlock_bh();
1da177e4 1000
fd92833a 1001 if (likely(err == 0))
f88c91dd 1002 inet6addr_notifier_call_chain(NETDEV_UP, ifa);
1da177e4
LT		 1003 else {
1004 kfree(ifa);
1005 ifa = ERR_PTR(err);
1006 }
1007
1008 return ifa;
1009out:
5c578aed 1010 spin_unlock(&addrconf_hash_lock);
1da177e4
LT		 1011 goto out2;
1012}
1013
5b84efec
TH		 1014enum cleanup_prefix_rt_t {
1015 CLEANUP_PREFIX_RT_NOP, /* no cleanup action for prefix route */
1016 CLEANUP_PREFIX_RT_DEL, /* delete the prefix route */
1017 CLEANUP_PREFIX_RT_EXPIRE, /* update the lifetime of the prefix route */
1018};
1019
1020/*
1021 * Check, whether the prefix for ifp would still need a prefix route
1022 * after deleting ifp. The function returns one of the CLEANUP_PREFIX_RT_*
1023 * constants.
1024 *
1025 * 1) we don't purge prefix if address was not permanent.
1026 * prefix is managed by its own lifetime.
1027 * 2) we also don't purge, if the address was IFA_F_NOPREFIXROUTE.
1028 * 3) if there are no addresses, delete prefix.
1029 * 4) if there are still other permanent address(es),
1030 * corresponding prefix is still permanent.
1031 * 5) if there are still other addresses with IFA_F_NOPREFIXROUTE,
1032 * don't purge the prefix, assume user space is managing it.
1033 * 6) otherwise, update prefix lifetime to the
1034 * longest valid lifetime among the corresponding
1035 * addresses on the device.
1036 * Note: subsequent RA will update lifetime.
1037 **/
1038static enum cleanup_prefix_rt_t
1039check_cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long *expires)
1040{
1041 struct inet6_ifaddr *ifa;
1042 struct inet6_dev *idev = ifp->idev;
1043 unsigned long lifetime;
1044 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_DEL;
1045
1046 *expires = jiffies;
1047
1048 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1049 if (ifa == ifp)
1050 continue;
1051 if (!ipv6_prefix_equal(&ifa->addr, &ifp->addr,
1052 ifp->prefix_len))
1053 continue;
1054 if (ifa->flags & (IFA_F_PERMANENT | IFA_F_NOPREFIXROUTE))
1055 return CLEANUP_PREFIX_RT_NOP;
1056
1057 action = CLEANUP_PREFIX_RT_EXPIRE;
1058
1059 spin_lock(&ifa->lock);
1060
1061 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
1062 /*
1063 * Note: Because this address is
1064 * not permanent, lifetime <
1065 * LONG_MAX / HZ here.
1066 */
1067 if (time_before(*expires, ifa->tstamp + lifetime * HZ))
1068 *expires = ifa->tstamp + lifetime * HZ;
1069 spin_unlock(&ifa->lock);
1070 }
1071
1072 return action;
1073}
1074
1075static void
1076cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long expires, bool del_rt)
1077{
1078 struct rt6_info *rt;
1079
1080 rt = addrconf_get_prefix_route(&ifp->addr,
1081 ifp->prefix_len,
1082 ifp->idev->dev,
1083 0, RTF_GATEWAY | RTF_DEFAULT);
1084 if (rt) {
1085 if (del_rt)
1086 ip6_del_rt(rt);
1087 else {
1088 if (!(rt->rt6i_flags & RTF_EXPIRES))
1089 rt6_set_expires(rt, expires);
1090 ip6_rt_put(rt);
1091 }
1092 }
1093}
1094
1095
1da177e4
LT		 1096/* This function wants to get referenced ifp and releases it before return */
1097
1098static void ipv6_del_addr(struct inet6_ifaddr *ifp)
1099{
4c5ff6a6 1100 int state;
5b84efec
TH		 1101 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_NOP;
1102 unsigned long expires;
1da177e4 1103
c15b1cca
HFS		 1104 ASSERT_RTNL();
1105
8e8e676d 1106 spin_lock_bh(&ifp->lock);
4c5ff6a6 1107 state = ifp->state;
e9d3e084 1108 ifp->state = INET6_IFADDR_STATE_DEAD;
8e8e676d 1109 spin_unlock_bh(&ifp->lock);
4c5ff6a6
HX		 1110
1111 if (state == INET6_IFADDR_STATE_DEAD)
1112 goto out;
1da177e4 1113
5c578aed 1114 spin_lock_bh(&addrconf_hash_lock);
1115 hlist_del_init_rcu(&ifp->addr_lst);
5c578aed 1116 spin_unlock_bh(&addrconf_hash_lock);
1da177e4 1117
5b84efec 1118 write_lock_bh(&ifp->idev->lock);
5d9efa7e 1119
1da177e4 1120 if (ifp->flags&IFA_F_TEMPORARY) {
372e6c8f 1121 list_del(&ifp->tmp_list);
1122 if (ifp->ifpub) {
1123 in6_ifa_put(ifp->ifpub);
1124 ifp->ifpub = NULL;
1da177e4 1125 }
372e6c8f 1126 __in6_ifa_put(ifp);
1da177e4 1127 }
1da177e4 1128
5b84efec
TH		 1129 if (ifp->flags & IFA_F_PERMANENT && !(ifp->flags & IFA_F_NOPREFIXROUTE))
1130 action = check_cleanup_prefix_route(ifp, &expires);
502a2ffd 1131
5b84efec
TH		 1132 list_del_init(&ifp->if_list);
1133 __in6_ifa_put(ifp);
1134
1135 write_unlock_bh(&ifp->idev->lock);
1da177e4 1136
c15b1cca 1137 addrconf_del_dad_work(ifp);
b2238566 1138
1da177e4
LT		 1139 ipv6_ifa_notify(RTM_DELADDR, ifp);
1140
f88c91dd 1141 inet6addr_notifier_call_chain(NETDEV_DOWN, ifp);
1da177e4 1142
5b84efec
TH		 1143 if (action != CLEANUP_PREFIX_RT_NOP) {
1144 cleanup_prefix_route(ifp, expires,
1145 action == CLEANUP_PREFIX_RT_DEL);
1da177e4
LT		 1146 }
1147
c3968a85
DW		 1148 /* clean up prefsrc entries */
1149 rt6_remove_prefsrc(ifp);
4c5ff6a6 1150out:
1da177e4
LT		 1151 in6_ifa_put(ifp);
1152}
1153
1da177e4
LT		 1154static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
1155{
1156 struct inet6_dev *idev = ifp->idev;
1157 struct in6_addr addr, *tmpaddr;
76f793e3 1158 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_tstamp, age;
eac55bf9 1159 unsigned long regen_advance;
1da177e4
LT		 1160 int tmp_plen;
1161 int ret = 0;
95c385b4 1162 u32 addr_flags;
76f793e3 1163 unsigned long now = jiffies;
1da177e4 1164
53bd6749 1165 write_lock_bh(&idev->lock);
1da177e4
LT		 1166 if (ift) {
1167 spin_lock_bh(&ift->lock);
1168 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
1169 spin_unlock_bh(&ift->lock);
1170 tmpaddr = &addr;
1171 } else {
1172 tmpaddr = NULL;
1173 }
1174retry:
1175 in6_dev_hold(idev);
1176 if (idev->cnf.use_tempaddr <= 0) {
53bd6749 1177 write_unlock_bh(&idev->lock);
f3213831 1178 pr_info("%s: use_tempaddr is disabled\n", __func__);
1da177e4
LT		 1179 in6_dev_put(idev);
1180 ret = -1;
1181 goto out;
1182 }
1183 spin_lock_bh(&ifp->lock);
1184 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
1185 idev->cnf.use_tempaddr = -1; /*XXX*/
1186 spin_unlock_bh(&ifp->lock);
53bd6749 1187 write_unlock_bh(&idev->lock);
f3213831
JP		 1188 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n",
1189 __func__);
1da177e4
LT		 1190 in6_dev_put(idev);
1191 ret = -1;
1192 goto out;
1193 }
1194 in6_ifa_hold(ifp);
1195 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
eb7e0575 1196 __ipv6_try_regen_rndid(idev, tmpaddr);
1da177e4 1197 memcpy(&addr.s6_addr[8], idev->rndid, 8);
76f793e3 1198 age = (now - ifp->tstamp) / HZ;
1da177e4
LT		 1199 tmp_valid_lft = min_t(__u32,
1200 ifp->valid_lft,
7a876b0e 1201 idev->cnf.temp_valid_lft + age);
1ab1457c
YH		 1202 tmp_prefered_lft = min_t(__u32,
1203 ifp->prefered_lft,
7a876b0e 1204 idev->cnf.temp_prefered_lft + age -
784e2710 1205 idev->cnf.max_desync_factor);
1da177e4 1206 tmp_plen = ifp->prefix_len;
1da177e4
LT		 1207 tmp_tstamp = ifp->tstamp;
1208 spin_unlock_bh(&ifp->lock);
1209
eac55bf9 1210 regen_advance = idev->cnf.regen_max_retry *
67ba4152
IM		 1211 idev->cnf.dad_transmits *
1212 NEIGH_VAR(idev->nd_parms, RETRANS_TIME) / HZ;
53bd6749 1213 write_unlock_bh(&idev->lock);
95c385b4 1214
eac55bf9
BB		 1215 /* A temporary address is created only if this calculated Preferred
1216 * Lifetime is greater than REGEN_ADVANCE time units. In particular,
1217 * an implementation must not create a temporary address with a zero
1218 * Preferred Lifetime.
ecab6701
HK		 1219 * Use age calculation as in addrconf_verify to avoid unnecessary
1220 * temporary addresses being generated.
eac55bf9 1221 */
ecab6701
HK		 1222 age = (now - tmp_tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
1223 if (tmp_prefered_lft <= regen_advance + age) {
eac55bf9
BB		 1224 in6_ifa_put(ifp);
1225 in6_dev_put(idev);
1226 ret = -1;
1227 goto out;
1228 }
1229
95c385b4
NH		 1230 addr_flags = IFA_F_TEMPORARY;
1231 /* set in addrconf_prefix_rcv() */
1232 if (ifp->flags & IFA_F_OPTIMISTIC)
1233 addr_flags |= IFA_F_OPTIMISTIC;
1234
4b08a8f1
HFS		 1235 ift = ipv6_add_addr(idev, &addr, NULL, tmp_plen,
1236 ipv6_addr_scope(&addr), addr_flags,
1237 tmp_valid_lft, tmp_prefered_lft);
1238 if (IS_ERR(ift)) {
1da177e4
LT		 1239 in6_ifa_put(ifp);
1240 in6_dev_put(idev);
f3213831 1241 pr_info("%s: retry temporary address regeneration\n", __func__);
1da177e4 1242 tmpaddr = &addr;
53bd6749 1243 write_lock_bh(&idev->lock);
1da177e4
LT		 1244 goto retry;
1245 }
1246
1247 spin_lock_bh(&ift->lock);
1248 ift->ifpub = ifp;
76f793e3 1249 ift->cstamp = now;
1da177e4
LT		 1250 ift->tstamp = tmp_tstamp;
1251 spin_unlock_bh(&ift->lock);
1252
cf22f9a2 1253 addrconf_dad_start(ift);
1da177e4
LT		 1254 in6_ifa_put(ift);
1255 in6_dev_put(idev);
1256out:
1257 return ret;
1258}
1da177e4
LT		 1259
1260/*
072047e4 1261 * Choose an appropriate source address (RFC3484)
1da177e4 1262 */
a9b05723
YH		 1263enum {
1264 IPV6_SADDR_RULE_INIT = 0,
1265 IPV6_SADDR_RULE_LOCAL,
1266 IPV6_SADDR_RULE_SCOPE,
1267 IPV6_SADDR_RULE_PREFERRED,
1268#ifdef CONFIG_IPV6_MIP6
1269 IPV6_SADDR_RULE_HOA,
1270#endif
1271 IPV6_SADDR_RULE_OIF,
1272 IPV6_SADDR_RULE_LABEL,
a9b05723 1273 IPV6_SADDR_RULE_PRIVACY,
a9b05723
YH		 1274 IPV6_SADDR_RULE_ORCHID,
1275 IPV6_SADDR_RULE_PREFIX,
7fd2561e
EK		 1276#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1277 IPV6_SADDR_RULE_NOT_OPTIMISTIC,
1278#endif
a9b05723
YH		 1279 IPV6_SADDR_RULE_MAX
1280};
1281
072047e4 1282struct ipv6_saddr_score {
a9b05723
YH		 1283 int rule;
1284 int addr_type;
1285 struct inet6_ifaddr *ifa;
1286 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
1287 int scopedist;
1288 int matchlen;
072047e4
YH		 1289};
1290
a9b05723 1291struct ipv6_saddr_dst {
9acd9f3a 1292 const struct in6_addr *addr;
a9b05723
YH		 1293 int ifindex;
1294 int scope;
1295 int label;
7cbca67c 1296 unsigned int prefs;
a9b05723 1297};
072047e4 1298
b6f99a21 1299static inline int ipv6_saddr_preferred(int type)
1da177e4 1300{
45bb0060 1301 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
072047e4
YH		 1302 return 1;
1303 return 0;
1da177e4
LT		 1304}
1305
7fd2561e
EK		 1306static inline bool ipv6_use_optimistic_addr(struct inet6_dev *idev)
1307{
1308#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1309 return idev && idev->cnf.optimistic_dad && idev->cnf.use_optimistic;
1310#else
1311 return false;
1312#endif
1313}
1314
3de23255
BT		 1315static int ipv6_get_saddr_eval(struct net *net,
1316 struct ipv6_saddr_score *score,
a9b05723
YH		 1317 struct ipv6_saddr_dst *dst,
1318 int i)
1319{
1320 int ret;
1321
1322 if (i <= score->rule) {
1323 switch (i) {
1324 case IPV6_SADDR_RULE_SCOPE:
1325 ret = score->scopedist;
1326 break;
1327 case IPV6_SADDR_RULE_PREFIX:
1328 ret = score->matchlen;
1329 break;
1330 default:
1331 ret = !!test_bit(i, score->scorebits);
1332 }
1333 goto out;
1334 }
1335
1336 switch (i) {
1337 case IPV6_SADDR_RULE_INIT:
1338 /* Rule 0: remember if hiscore is not ready yet */
1339 ret = !!score->ifa;
1340 break;
1341 case IPV6_SADDR_RULE_LOCAL:
1342 /* Rule 1: Prefer same address */
1343 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1344 break;
1345 case IPV6_SADDR_RULE_SCOPE:
1346 /* Rule 2: Prefer appropriate scope
1347 *
1348 * ret
1349 * ^
1350 * -1 | d 15
1351 * ---+--+-+---> scope
1352 * |
1353 * | d is scope of the destination.
1354 * B-d | \
1355 * | \ <- smaller scope is better if
db9c7c39 1356 * B-15 | \ if scope is enough for destination.
a9b05723
YH		 1357 * | ret = B - scope (-1 <= scope >= d <= 15).
1358 * d-C-1 | /
1359 * |/ <- greater is better
1360 * -C / if scope is not enough for destination.
1361 * /| ret = scope - C (-1 <= d < scope <= 15).
1362 *
1363 * d - C - 1 < B -15 (for all -1 <= d <= 15).
1364 * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1365 * Assume B = 0 and we get C > 29.
1366 */
1367 ret = __ipv6_addr_src_scope(score->addr_type);
1368 if (ret >= dst->scope)
1369 ret = -ret;
1370 else
1371 ret -= 128; /* 30 is enough */
1372 score->scopedist = ret;
1373 break;
1374 case IPV6_SADDR_RULE_PREFERRED:
7fd2561e 1375 {
a9b05723 1376 /* Rule 3: Avoid deprecated and optimistic addresses */
7fd2561e
EK		 1377 u8 avoid = IFA_F_DEPRECATED;
1378
1379 if (!ipv6_use_optimistic_addr(score->ifa->idev))
1380 avoid |= IFA_F_OPTIMISTIC;
a9b05723 1381 ret = ipv6_saddr_preferred(score->addr_type) ||
7fd2561e 1382 !(score->ifa->flags & avoid);
a9b05723 1383 break;
7fd2561e 1384 }
a9b05723
YH		 1385#ifdef CONFIG_IPV6_MIP6
1386 case IPV6_SADDR_RULE_HOA:
7cbca67c 1387 {
a9b05723 1388 /* Rule 4: Prefer home address */
7cbca67c
YH		 1389 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1390 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
a9b05723 1391 break;
7cbca67c 1392 }
a9b05723
YH		 1393#endif
1394 case IPV6_SADDR_RULE_OIF:
1395 /* Rule 5: Prefer outgoing interface */
1396 ret = (!dst->ifindex ||
1397 dst->ifindex == score->ifa->idev->dev->ifindex);
1398 break;
1399 case IPV6_SADDR_RULE_LABEL:
1400 /* Rule 6: Prefer matching label */
3de23255
BT		 1401 ret = ipv6_addr_label(net,
1402 &score->ifa->addr, score->addr_type,
a9b05723
YH		 1403 score->ifa->idev->dev->ifindex) == dst->label;
1404 break;
a9b05723 1405 case IPV6_SADDR_RULE_PRIVACY:
7cbca67c 1406 {
a9b05723 1407 /* Rule 7: Prefer public address
25985edc 1408 * Note: prefer temporary address if use_tempaddr >= 2
a9b05723 1409 */
7cbca67c
YH		 1410 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1411 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1412 score->ifa->idev->cnf.use_tempaddr >= 2;
1413 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
a9b05723 1414 break;
7cbca67c 1415 }
a9b05723
YH		 1416 case IPV6_SADDR_RULE_ORCHID:
1417 /* Rule 8-: Prefer ORCHID vs ORCHID or
1418 * non-ORCHID vs non-ORCHID
1419 */
1420 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1421 ipv6_addr_orchid(dst->addr));
1422 break;
1423 case IPV6_SADDR_RULE_PREFIX:
1424 /* Rule 8: Use longest matching prefix */
91b4b04f
YH		 1425 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr);
1426 if (ret > score->ifa->prefix_len)
1427 ret = score->ifa->prefix_len;
1428 score->matchlen = ret;
a9b05723 1429 break;
7fd2561e
EK		 1430#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1431 case IPV6_SADDR_RULE_NOT_OPTIMISTIC:
1432 /* Optimistic addresses still have lower precedence than other
1433 * preferred addresses.
1434 */
1435 ret = !(score->ifa->flags & IFA_F_OPTIMISTIC);
1436 break;
1437#endif
a9b05723
YH		 1438 default:
1439 ret = 0;
1440 }
1441
1442 if (ret)
1443 __set_bit(i, score->scorebits);
1444 score->rule = i;
1445out:
1446 return ret;
1447}
1448
c0b8da1e
YH		 1449static int __ipv6_dev_get_saddr(struct net *net,
1450 struct ipv6_saddr_dst *dst,
c0b8da1e
YH		 1451 struct inet6_dev *idev,
1452 struct ipv6_saddr_score *scores,
1453 int hiscore_idx)
9131f3de 1454{
c0b8da1e 1455 struct ipv6_saddr_score *score = &scores[1 - hiscore_idx], *hiscore = &scores[hiscore_idx];
9131f3de
YH		 1456
1457 read_lock_bh(&idev->lock);
1458 list_for_each_entry(score->ifa, &idev->addr_list, if_list) {
1459 int i;
1460
1461 /*
1462 * - Tentative Address (RFC2462 section 5.4)
1463 * - A tentative address is not considered
1464 * "assigned to an interface" in the traditional
1465 * sense, unless it is also flagged as optimistic.
1466 * - Candidate Source Address (section 4)
1467 * - In any case, anycast addresses, multicast
1468 * addresses, and the unspecified address MUST
1469 * NOT be included in a candidate set.
1470 */
1471 if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1472 (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
1473 continue;
1474
1475 score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1476
1477 if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1478 score->addr_type & IPV6_ADDR_MULTICAST)) {
1479 net_dbg_ratelimited("ADDRCONF: unspecified / multicast address assigned as unicast address on %s",
1480 idev->dev->name);
1481 continue;
1482 }
1483
1484 score->rule = -1;
1485 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1486
1487 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1488 int minihiscore, miniscore;
1489
1490 minihiscore = ipv6_get_saddr_eval(net, hiscore, dst, i);
1491 miniscore = ipv6_get_saddr_eval(net, score, dst, i);
1492
1493 if (minihiscore > miniscore) {
1494 if (i == IPV6_SADDR_RULE_SCOPE &&
1495 score->scopedist > 0) {
1496 /*
1497 * special case:
1498 * each remaining entry
1499 * has too small (not enough)
1500 * scope, because ifa entries
1501 * are sorted by their scope
1502 * values.
1503 */
1504 goto out;
1505 }
1506 break;
1507 } else if (minihiscore < miniscore) {
1508 if (hiscore->ifa)
1509 in6_ifa_put(hiscore->ifa);
1510
1511 in6_ifa_hold(score->ifa);
1512
1513 swap(hiscore, score);
c0b8da1e 1514 hiscore_idx = 1 - hiscore_idx;
9131f3de
YH		 1515
1516 /* restore our iterator */
1517 score->ifa = hiscore->ifa;
1518
1519 break;
1520 }
1521 }
1522 }
1523out:
1524 read_unlock_bh(&idev->lock);
c0b8da1e 1525 return hiscore_idx;
9131f3de
YH		 1526}
1527
b3f644fc 1528int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev,
9acd9f3a 1529 const struct in6_addr *daddr, unsigned int prefs,
7cbca67c 1530 struct in6_addr *saddr)
1da177e4 1531{
c0b8da1e 1532 struct ipv6_saddr_score scores[2], *hiscore;
a9b05723 1533 struct ipv6_saddr_dst dst;
9131f3de 1534 struct inet6_dev *idev;
072047e4 1535 struct net_device *dev;
a9b05723 1536 int dst_type;
9131f3de 1537 bool use_oif_addr = false;
c0b8da1e 1538 int hiscore_idx = 0;
1da177e4 1539
a9b05723
YH		 1540 dst_type = __ipv6_addr_type(daddr);
1541 dst.addr = daddr;
1542 dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1543 dst.scope = __ipv6_addr_src_scope(dst_type);
3de23255 1544 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
7cbca67c 1545 dst.prefs = prefs;
a9b05723 1546
c0b8da1e
YH		 1547 scores[hiscore_idx].rule = -1;
1548 scores[hiscore_idx].ifa = NULL;
1da177e4 1549
8814c4b5 1550 rcu_read_lock();
1da177e4 1551
9131f3de
YH		 1552 /* Candidate Source Address (section 4)
1553 * - multicast and link-local destination address,
1554 * the set of candidate source address MUST only
1555 * include addresses assigned to interfaces
1556 * belonging to the same link as the outgoing
1557 * interface.
1558 * (- For site-local destination addresses, the
1559 * set of candidate source addresses MUST only
1560 * include addresses assigned to interfaces
1561 * belonging to the same site as the outgoing
1562 * interface.)
3985e8a3
EK		 1563 * - "It is RECOMMENDED that the candidate source addresses
1564 * be the set of unicast addresses assigned to the
1565 * interface that will be used to send to the destination
1566 * (the 'outgoing' interface)." (RFC 6724)
9131f3de
YH		 1567 */
1568 if (dst_dev) {
3985e8a3 1569 idev = __in6_dev_get(dst_dev);
9131f3de 1570 if ((dst_type & IPV6_ADDR_MULTICAST) ||
3985e8a3
EK		 1571 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL ||
1572 (idev && idev->cnf.use_oif_addrs_only)) {
9131f3de
YH		 1573 use_oif_addr = true;
1574 }
1575 }
a9b05723 1576
9131f3de 1577 if (use_oif_addr) {
c0b8da1e 1578 if (idev)
c15df306 1579 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx);
9131f3de
YH		 1580 } else {
1581 for_each_netdev_rcu(net, dev) {
1582 idev = __in6_dev_get(dev);
1583 if (!idev)
072047e4 1584 continue;
c15df306 1585 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx);
1da177e4
LT		 1586 }
1587 }
8814c4b5 1588 rcu_read_unlock();
1da177e4 1589
c0b8da1e 1590 hiscore = &scores[hiscore_idx];
a9b05723 1591 if (!hiscore->ifa)
072047e4 1592 return -EADDRNOTAVAIL;
1ab1457c 1593
4e3fd7a0 1594 *saddr = hiscore->ifa->addr;
a9b05723 1595 in6_ifa_put(hiscore->ifa);
072047e4 1596 return 0;
1da177e4 1597}
5e5f3f0f 1598EXPORT_SYMBOL(ipv6_dev_get_saddr);
1da177e4 1599
8965779d 1600int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr,
479840ff 1601 u32 banned_flags)
b7b1bfce
HFS		 1602{
1603 struct inet6_ifaddr *ifp;
1604 int err = -EADDRNOTAVAIL;
1605
602582ca
HFS		 1606 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
1607 if (ifp->scope > IFA_LINK)
1608 break;
b7b1bfce
HFS		 1609 if (ifp->scope == IFA_LINK &&
1610 !(ifp->flags & banned_flags)) {
1611 *addr = ifp->addr;
1612 err = 0;
1613 break;
1614 }
1615 }
1616 return err;
1617}
1618
95c385b4 1619int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
479840ff 1620 u32 banned_flags)
1da177e4
LT		 1621{
1622 struct inet6_dev *idev;
1623 int err = -EADDRNOTAVAIL;
1624
8814c4b5 1625 rcu_read_lock();
e21e8467
SH		 1626 idev = __in6_dev_get(dev);
1627 if (idev) {
1da177e4 1628 read_lock_bh(&idev->lock);
b7b1bfce 1629 err = __ipv6_get_lladdr(idev, addr, banned_flags);
1da177e4
LT		 1630 read_unlock_bh(&idev->lock);
1631 }
8814c4b5 1632 rcu_read_unlock();
1da177e4
LT		 1633 return err;
1634}
1635
1636static int ipv6_count_addresses(struct inet6_dev *idev)
1637{
1638 int cnt = 0;
1639 struct inet6_ifaddr *ifp;
1640
1641 read_lock_bh(&idev->lock);
502a2ffd 1642 list_for_each_entry(ifp, &idev->addr_list, if_list)
1da177e4
LT		 1643 cnt++;
1644 read_unlock_bh(&idev->lock);
1645 return cnt;
1646}
1647
b71d1d42 1648int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
2a7851bf 1649 const struct net_device *dev, int strict)
c58da4c6
EK		 1650{
1651 return ipv6_chk_addr_and_flags(net, addr, dev, strict, IFA_F_TENTATIVE);
1652}
1653EXPORT_SYMBOL(ipv6_chk_addr);
1654
1655int ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr,
1656 const struct net_device *dev, int strict,
1657 u32 banned_flags)
1da177e4 1658{
eedf042a 1659 struct inet6_ifaddr *ifp;
ddbe5032 1660 unsigned int hash = inet6_addr_hash(addr);
c58da4c6 1661 u32 ifp_flags;
1da177e4 1662
5c578aed 1663 rcu_read_lock_bh();
b67bfe0d 1664 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
878628fb 1665 if (!net_eq(dev_net(ifp->idev->dev), net))
bfeade08 1666 continue;
c58da4c6
EK		 1667 /* Decouple optimistic from tentative for evaluation here.
1668 * Ban optimistic addresses explicitly, when required.
1669 */
1670 ifp_flags = (ifp->flags&IFA_F_OPTIMISTIC)
1671 ? (ifp->flags&~IFA_F_TENTATIVE)
1672 : ifp->flags;
1da177e4 1673 if (ipv6_addr_equal(&ifp->addr, addr) &&
c58da4c6 1674 !(ifp_flags&banned_flags) &&
63159f29 1675 (!dev || ifp->idev->dev == dev ||
eedf042a
SH		 1676 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) {
1677 rcu_read_unlock_bh();
1678 return 1;
1da177e4
LT		 1679 }
1680 }
5c578aed 1681
eedf042a
SH		 1682 rcu_read_unlock_bh();
1683 return 0;
1da177e4 1684}
c58da4c6 1685EXPORT_SYMBOL(ipv6_chk_addr_and_flags);
7159039a 1686
3e81c6da
DM		 1687static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1688 struct net_device *dev)
1da177e4 1689{
ddbe5032 1690 unsigned int hash = inet6_addr_hash(addr);
c2e21293 1691 struct inet6_ifaddr *ifp;
1da177e4 1692
b67bfe0d 1693 hlist_for_each_entry(ifp, &inet6_addr_lst[hash], addr_lst) {
878628fb 1694 if (!net_eq(dev_net(ifp->idev->dev), net))
06bfe655 1695 continue;
1da177e4 1696 if (ipv6_addr_equal(&ifp->addr, addr)) {
63159f29 1697 if (!dev || ifp->idev->dev == dev)
3e81c6da 1698 return true;
1da177e4
LT		 1699 }
1700 }
3e81c6da 1701 return false;
1da177e4
LT		 1702}
1703
7df37ff3
CB		 1704/* Compares an address/prefix_len with addresses on device @dev.
1705 * If one is found it returns true.
1706 */
1707bool ipv6_chk_custom_prefix(const struct in6_addr *addr,
1708 const unsigned int prefix_len, struct net_device *dev)
1709{
1710 struct inet6_dev *idev;
1711 struct inet6_ifaddr *ifa;
1712 bool ret = false;
1713
1714 rcu_read_lock();
1715 idev = __in6_dev_get(dev);
1716 if (idev) {
1717 read_lock_bh(&idev->lock);
1718 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1719 ret = ipv6_prefix_equal(addr, &ifa->addr, prefix_len);
1720 if (ret)
1721 break;
1722 }
1723 read_unlock_bh(&idev->lock);
1724 }
1725 rcu_read_unlock();
1726
1727 return ret;
1728}
1729EXPORT_SYMBOL(ipv6_chk_custom_prefix);
1730
b71d1d42 1731int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev)
52eeeb84
YH		 1732{
1733 struct inet6_dev *idev;
1734 struct inet6_ifaddr *ifa;
1735 int onlink;
1736
1737 onlink = 0;
1738 rcu_read_lock();
1739 idev = __in6_dev_get(dev);
1740 if (idev) {
1741 read_lock_bh(&idev->lock);
502a2ffd 1742 list_for_each_entry(ifa, &idev->addr_list, if_list) {
52eeeb84
YH		 1743 onlink = ipv6_prefix_equal(addr, &ifa->addr,
1744 ifa->prefix_len);
1745 if (onlink)
1746 break;
1747 }
1748 read_unlock_bh(&idev->lock);
1749 }
1750 rcu_read_unlock();
1751 return onlink;
1752}
52eeeb84
YH		 1753EXPORT_SYMBOL(ipv6_chk_prefix);
1754
9acd9f3a 1755struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1cab3da6 1756 struct net_device *dev, int strict)
1da177e4 1757{
b79d1d54 1758 struct inet6_ifaddr *ifp, *result = NULL;
ddbe5032 1759 unsigned int hash = inet6_addr_hash(addr);
1da177e4 1760
5c578aed 1761 rcu_read_lock_bh();
b67bfe0d 1762 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
878628fb 1763 if (!net_eq(dev_net(ifp->idev->dev), net))
1cab3da6 1764 continue;
1da177e4 1765 if (ipv6_addr_equal(&ifp->addr, addr)) {
63159f29 1766 if (!dev || ifp->idev->dev == dev ||
1da177e4 1767 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
b79d1d54 1768 result = ifp;
1da177e4
LT		 1769 in6_ifa_hold(ifp);
1770 break;
1771 }
1772 }
1773 }
5c578aed 1774 rcu_read_unlock_bh();
1da177e4 1775
b79d1d54 1776 return result;
1da177e4
LT		 1777}
1778
1da177e4
LT		 1779/* Gets referenced address, destroys ifaddr */
1780
cc411d0b 1781static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
1da177e4 1782{
3d171f39
LR		 1783 if (dad_failed)
1784 ifp->flags |= IFA_F_DADFAILED;
1785
1da177e4
LT		 1786 if (ifp->flags&IFA_F_PERMANENT) {
1787 spin_lock_bh(&ifp->lock);
c15b1cca 1788 addrconf_del_dad_work(ifp);
1da177e4
LT		 1789 ifp->flags |= IFA_F_TENTATIVE;
1790 spin_unlock_bh(&ifp->lock);
e2577a06
HX		 1791 if (dad_failed)
1792 ipv6_ifa_notify(0, ifp);
1da177e4 1793 in6_ifa_put(ifp);
1da177e4
LT		 1794 } else if (ifp->flags&IFA_F_TEMPORARY) {
1795 struct inet6_ifaddr *ifpub;
1796 spin_lock_bh(&ifp->lock);
1797 ifpub = ifp->ifpub;
1798 if (ifpub) {
1799 in6_ifa_hold(ifpub);
1800 spin_unlock_bh(&ifp->lock);
1801 ipv6_create_tempaddr(ifpub, ifp);
1802 in6_ifa_put(ifpub);
1803 } else {
1804 spin_unlock_bh(&ifp->lock);
1805 }
1806 ipv6_del_addr(ifp);
c15b1cca 1807 } else {
1da177e4 1808 ipv6_del_addr(ifp);
c15b1cca 1809 }
1da177e4
LT		 1810}
1811
f2344a13
HX		 1812static int addrconf_dad_end(struct inet6_ifaddr *ifp)
1813{
1814 int err = -ENOENT;
1815
8e8e676d 1816 spin_lock_bh(&ifp->lock);
f2344a13
HX		 1817 if (ifp->state == INET6_IFADDR_STATE_DAD) {
1818 ifp->state = INET6_IFADDR_STATE_POSTDAD;
1819 err = 0;
1820 }
8e8e676d 1821 spin_unlock_bh(&ifp->lock);
f2344a13
HX		 1822
1823 return err;
1824}
1825
3c21edbd
YH		 1826void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1827{
5f40ef77 1828 struct in6_addr addr;
1b34be74 1829 struct inet6_dev *idev = ifp->idev;
1855b7c3 1830 struct net *net = dev_net(ifp->idev->dev);
9bdd8d40 1831
853dc2e0
UB		 1832 if (addrconf_dad_end(ifp)) {
1833 in6_ifa_put(ifp);
f2344a13 1834 return;
853dc2e0 1835 }
f2344a13 1836
e87cc472
JP		 1837 net_info_ratelimited("%s: IPv6 duplicate address %pI6c detected!\n",
1838 ifp->idev->dev->name, &ifp->addr);
9bdd8d40 1839
5f40ef77
HFS		 1840 spin_lock_bh(&ifp->lock);
1841
1842 if (ifp->flags & IFA_F_STABLE_PRIVACY) {
1843 int scope = ifp->scope;
1844 u32 flags = ifp->flags;
1845 struct in6_addr new_addr;
1846 struct inet6_ifaddr *ifp2;
1847 u32 valid_lft, preferred_lft;
1848 int pfxlen = ifp->prefix_len;
5f40ef77
HFS		 1849 int retries = ifp->stable_privacy_retry + 1;
1850
1855b7c3 1851 if (retries > net->ipv6.sysctl.idgen_retries) {
5f40ef77
HFS		 1852 net_info_ratelimited("%s: privacy stable address generation failed because of DAD conflicts!\n",
1853 ifp->idev->dev->name);
1854 goto errdad;
1855 }
1856
1857 new_addr = ifp->addr;
1858 if (ipv6_generate_stable_address(&new_addr, retries,
1859 idev))
1860 goto errdad;
1861
1862 valid_lft = ifp->valid_lft;
1863 preferred_lft = ifp->prefered_lft;
1864
1865 spin_unlock_bh(&ifp->lock);
1b34be74 1866
5f40ef77
HFS		 1867 if (idev->cnf.max_addresses &&
1868 ipv6_count_addresses(idev) >=
1869 idev->cnf.max_addresses)
1870 goto lock_errdad;
1871
1872 net_info_ratelimited("%s: generating new stable privacy address because of DAD conflict\n",
1873 ifp->idev->dev->name);
1874
1875 ifp2 = ipv6_add_addr(idev, &new_addr, NULL, pfxlen,
1876 scope, flags, valid_lft,
1877 preferred_lft);
1878 if (IS_ERR(ifp2))
1879 goto lock_errdad;
1880
1881 spin_lock_bh(&ifp2->lock);
1882 ifp2->stable_privacy_retry = retries;
1883 ifp2->state = INET6_IFADDR_STATE_PREDAD;
1884 spin_unlock_bh(&ifp2->lock);
1885
1855b7c3 1886 addrconf_mod_dad_work(ifp2, net->ipv6.sysctl.idgen_delay);
5f40ef77
HFS		 1887 in6_ifa_put(ifp2);
1888lock_errdad:
1889 spin_lock_bh(&ifp->lock);
1890 } else if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6) {
1b34be74
YH		 1891 addr.s6_addr32[0] = htonl(0xfe800000);
1892 addr.s6_addr32[1] = 0;
1893
1894 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
1895 ipv6_addr_equal(&ifp->addr, &addr)) {
1896 /* DAD failed for link-local based on MAC address */
1897 idev->cnf.disable_ipv6 = 1;
9bdd8d40 1898
f3213831 1899 pr_info("%s: IPv6 being disabled!\n",
9bdd8d40 1900 ifp->idev->dev->name);
1b34be74
YH		 1901 }
1902 }
1903
5f40ef77 1904errdad:
c15b1cca
HFS		 1905 /* transition from _POSTDAD to _ERRDAD */
1906 ifp->state = INET6_IFADDR_STATE_ERRDAD;
8e8e676d 1907 spin_unlock_bh(&ifp->lock);
c15b1cca
HFS		 1908
1909 addrconf_mod_dad_work(ifp, 0);
3c21edbd 1910}
1da177e4 1911
a9ed4a29
SD		 1912/* Join to solicited addr multicast group.
1913 * caller must hold RTNL */
b71d1d42 1914void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr)
1da177e4
LT		 1915{
1916 struct in6_addr maddr;
1917
1918 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1919 return;
1920
1921 addrconf_addr_solict_mult(addr, &maddr);
1922 ipv6_dev_mc_inc(dev, &maddr);
1923}
1924
a9ed4a29 1925/* caller must hold RTNL */
b71d1d42 1926void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr)
1da177e4
LT		 1927{
1928 struct in6_addr maddr;
1929
1930 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1931 return;
1932
1933 addrconf_addr_solict_mult(addr, &maddr);
1934 __ipv6_dev_mc_dec(idev, &maddr);
1935}
1936
a9ed4a29 1937/* caller must hold RTNL */
20380731 1938static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1da177e4
LT		 1939{
1940 struct in6_addr addr;
c15b1cca 1941
88ad3149 1942 if (ifp->prefix_len >= 127) /* RFC 6164 */
2bda8a0c 1943 return;
1da177e4
LT		 1944 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1945 if (ipv6_addr_any(&addr))
1946 return;
013b4d90 1947 __ipv6_dev_ac_inc(ifp->idev, &addr);
1da177e4
LT		 1948}
1949
a9ed4a29 1950/* caller must hold RTNL */
20380731 1951static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1da177e4
LT		 1952{
1953 struct in6_addr addr;
c15b1cca 1954
88ad3149 1955 if (ifp->prefix_len >= 127) /* RFC 6164 */
32019e65 1956 return;
1da177e4
LT		 1957 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1958 if (ipv6_addr_any(&addr))
1959 return;
1960 __ipv6_dev_ac_dec(ifp->idev, &addr);
1961}
1962
06a4c1c5 1963static int addrconf_ifid_eui64(u8 *eui, struct net_device *dev)
1964{
5241c2d7 1965 if (dev->addr_len != EUI64_ADDR_LEN)
06a4c1c5 1966 return -1;
5241c2d7 1967 memcpy(eui, dev->dev_addr, EUI64_ADDR_LEN);
5e98a36e 1968 eui[0] ^= 2;
06a4c1c5 1969 return 0;
1970}
1971
cb6bf355
YH		 1972static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev)
1973{
1974 union fwnet_hwaddr *ha;
1975
1976 if (dev->addr_len != FWNET_ALEN)
1977 return -1;
1978
1979 ha = (union fwnet_hwaddr *)dev->dev_addr;
1980
1981 memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id));
1982 eui[0] ^= 2;
1983 return 0;
1984}
1985
073a8e0e
YH		 1986static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1987{
1988 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1989 if (dev->addr_len != ARCNET_ALEN)
1990 return -1;
1991 memset(eui, 0, 7);
8e5e8f30 1992 eui[7] = *(u8 *)dev->dev_addr;
073a8e0e
YH		 1993 return 0;
1994}
1995
1996static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1997{
1998 if (dev->addr_len != INFINIBAND_ALEN)
1999 return -1;
2000 memcpy(eui, dev->dev_addr + 12, 8);
2001 eui[0] |= 2;
2002 return 0;
2003}
2004
c61393ea 2005static int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
dfd982ba 2006{
9af28511
SH		 2007 if (addr == 0)
2008 return -1;
dfd982ba
YH		 2009 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
2010 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
2011 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
2012 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
2013 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
2014 ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
2015 eui[1] = 0;
2016 eui[2] = 0x5E;
2017 eui[3] = 0xFE;
2018 memcpy(eui + 4, &addr, 4);
2019 return 0;
2020}
dfd982ba
YH		 2021
2022static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
2023{
2024 if (dev->priv_flags & IFF_ISATAP)
2025 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
2026 return -1;
2027}
2028
aee80b54 2029static int addrconf_ifid_gre(u8 *eui, struct net_device *dev)
2030{
2031 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
2032}
2033
e837735e
ND		 2034static int addrconf_ifid_ip6tnl(u8 *eui, struct net_device *dev)
2035{
2036 memcpy(eui, dev->perm_addr, 3);
2037 memcpy(eui + 5, dev->perm_addr + 3, 3);
2038 eui[3] = 0xFF;
2039 eui[4] = 0xFE;
2040 eui[0] ^= 2;
2041 return 0;
2042}
2043
1da177e4
LT		 2044static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
2045{
2046 switch (dev->type) {
2047 case ARPHRD_ETHER:
2048 case ARPHRD_FDDI:
073a8e0e 2049 return addrconf_ifid_eui48(eui, dev);
1da177e4 2050 case ARPHRD_ARCNET:
073a8e0e 2051 return addrconf_ifid_arcnet(eui, dev);
1da177e4 2052 case ARPHRD_INFINIBAND:
073a8e0e 2053 return addrconf_ifid_infiniband(eui, dev);
c7dc89c0 2054 case ARPHRD_SIT:
dfd982ba 2055 return addrconf_ifid_sit(eui, dev);
aee80b54 2056 case ARPHRD_IPGRE:
2057 return addrconf_ifid_gre(eui, dev);
e74bccb8 2058 case ARPHRD_6LOWPAN:
06a4c1c5 2059 return addrconf_ifid_eui64(eui, dev);
cb6bf355
YH		 2060 case ARPHRD_IEEE1394:
2061 return addrconf_ifid_ieee1394(eui, dev);
e837735e
ND		 2062 case ARPHRD_TUNNEL6:
2063 return addrconf_ifid_ip6tnl(eui, dev);
1da177e4
LT		 2064 }
2065 return -1;
2066}
2067
2068static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
2069{
2070 int err = -1;
2071 struct inet6_ifaddr *ifp;
2072
2073 read_lock_bh(&idev->lock);
602582ca
HFS		 2074 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
2075 if (ifp->scope > IFA_LINK)
2076 break;
1da177e4
LT		 2077 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
2078 memcpy(eui, ifp->addr.s6_addr+8, 8);
2079 err = 0;
2080 break;
2081 }
2082 }
2083 read_unlock_bh(&idev->lock);
2084 return err;
2085}
2086
1da177e4 2087/* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
eb7e0575 2088static void __ipv6_regen_rndid(struct inet6_dev *idev)
1da177e4 2089{
1da177e4 2090regen:
955189ef 2091 get_random_bytes(idev->rndid, sizeof(idev->rndid));
1da177e4 2092 idev->rndid[0] &= ~0x02;
1da177e4
LT		 2093
2094 /*
2095 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
2096 * check if generated address is not inappropriate
2097 *
2098 * - Reserved subnet anycast (RFC 2526)
2099 * 11111101 11....11 1xxxxxxx
c7dc89c0 2100 * - ISATAP (RFC4214) 6.1
1da177e4
LT		 2101 * 00-00-5E-FE-xx-xx-xx-xx
2102 * - value 0
2103 * - XXX: already assigned to an address on the device
2104 */
1ab1457c 2105 if (idev->rndid[0] == 0xfd &&
1da177e4
LT		 2106 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
2107 (idev->rndid[7]&0x80))
2108 goto regen;
2109 if ((idev->rndid[0]|idev->rndid[1]) == 0) {
2110 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
2111 goto regen;
2112 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
2113 goto regen;
2114 }
1da177e4
LT		 2115}
2116
2117static void ipv6_regen_rndid(unsigned long data)
2118{
2119 struct inet6_dev *idev = (struct inet6_dev *) data;
2120 unsigned long expires;
2121
8814c4b5 2122 rcu_read_lock_bh();
1da177e4
LT		 2123 write_lock_bh(&idev->lock);
2124
2125 if (idev->dead)
2126 goto out;
2127
eb7e0575 2128 __ipv6_regen_rndid(idev);
1ab1457c 2129
1da177e4 2130 expires = jiffies +
1ab1457c 2131 idev->cnf.temp_prefered_lft * HZ -
1f9248e5
JP		 2132 idev->cnf.regen_max_retry * idev->cnf.dad_transmits *
2133 NEIGH_VAR(idev->nd_parms, RETRANS_TIME) -
784e2710 2134 idev->cnf.max_desync_factor * HZ;
1da177e4 2135 if (time_before(expires, jiffies)) {
f3213831
JP		 2136 pr_warn("%s: too short regeneration interval; timer disabled for %s\n",
2137 __func__, idev->dev->name);
1da177e4
LT		 2138 goto out;
2139 }
2140
2141 if (!mod_timer(&idev->regen_timer, expires))
2142 in6_dev_hold(idev);
2143
2144out:
2145 write_unlock_bh(&idev->lock);
8814c4b5 2146 rcu_read_unlock_bh();
1da177e4
LT		 2147 in6_dev_put(idev);
2148}
2149
eb7e0575 2150static void __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr)
8e5e8f30 2151{
1da177e4 2152 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
eb7e0575 2153 __ipv6_regen_rndid(idev);
1da177e4 2154}
1da177e4
LT		 2155
2156/*
2157 * Add prefix route.
2158 */
2159
2160static void
2161addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
e431b8c0 2162 unsigned long expires, u32 flags)
1da177e4 2163{
86872cb5 2164 struct fib6_config cfg = {
ca254490 2165 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX,
86872cb5
TG		 2166 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2167 .fc_ifindex = dev->ifindex,
2168 .fc_expires = expires,
2169 .fc_dst_len = plen,
2170 .fc_flags = RTF_UP | flags,
c346dca1 2171 .fc_nlinfo.nl_net = dev_net(dev),
f410a1fb 2172 .fc_protocol = RTPROT_KERNEL,
86872cb5 2173 };
1da177e4 2174
4e3fd7a0 2175 cfg.fc_dst = *pfx;
1da177e4
LT		 2176
2177 /* Prevent useless cloning on PtP SIT.
2178 This thing is done here expecting that the whole
2179 class of non-broadcast devices need not cloning.
2180 */
07a93626 2181#if IS_ENABLED(CONFIG_IPV6_SIT)
86872cb5
TG		 2182 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
2183 cfg.fc_flags |= RTF_NONEXTHOP;
0be669bb 2184#endif
1da177e4 2185
86872cb5 2186 ip6_route_add(&cfg);
1da177e4
LT		 2187}
2188
14ef37b6
AH		 2189
2190static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
2191 int plen,
2192 const struct net_device *dev,
2193 u32 flags, u32 noflags)
2194{
2195 struct fib6_node *fn;
2196 struct rt6_info *rt = NULL;
2197 struct fib6_table *table;
ca254490 2198 u32 tb_id = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX;
14ef37b6 2199
ca254490 2200 table = fib6_get_table(dev_net(dev), tb_id);
63159f29 2201 if (!table)
14ef37b6
AH		 2202 return NULL;
2203
5744dd9b 2204 read_lock_bh(&table->tb6_lock);
14ef37b6
AH		 2205 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0);
2206 if (!fn)
2207 goto out;
1f56a01f
MKL		 2208
2209 noflags |= RTF_CACHE;
14ef37b6 2210 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
d1918542 2211 if (rt->dst.dev->ifindex != dev->ifindex)
14ef37b6
AH		 2212 continue;
2213 if ((rt->rt6i_flags & flags) != flags)
2214 continue;
85da53bf 2215 if ((rt->rt6i_flags & noflags) != 0)
14ef37b6
AH		 2216 continue;
2217 dst_hold(&rt->dst);
2218 break;
2219 }
2220out:
5744dd9b 2221 read_unlock_bh(&table->tb6_lock);
14ef37b6
AH		 2222 return rt;
2223}
2224
2225
1da177e4
LT		 2226/* Create "default" multicast route to the interface */
2227
2228static void addrconf_add_mroute(struct net_device *dev)
2229{
86872cb5 2230 struct fib6_config cfg = {
ca254490 2231 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_LOCAL,
86872cb5
TG		 2232 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2233 .fc_ifindex = dev->ifindex,
2234 .fc_dst_len = 8,
2235 .fc_flags = RTF_UP,
c346dca1 2236 .fc_nlinfo.nl_net = dev_net(dev),
86872cb5
TG		 2237 };
2238
2239 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
2240
2241 ip6_route_add(&cfg);
1da177e4
LT		 2242}
2243
1da177e4
LT		 2244static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
2245{
2246 struct inet6_dev *idev;
2247
2248 ASSERT_RTNL();
2249
e21e8467
SH		 2250 idev = ipv6_find_idev(dev);
2251 if (!idev)
64e724f6
BH		 2252 return ERR_PTR(-ENOBUFS);
2253
2254 if (idev->cnf.disable_ipv6)
2255 return ERR_PTR(-EACCES);
1da177e4
LT		 2256
2257 /* Add default multicast route */
4af04aba
LW		 2258 if (!(dev->flags & IFF_LOOPBACK))
2259 addrconf_add_mroute(dev);
1da177e4 2260
1da177e4
LT		 2261 return idev;
2262}
2263
53bd6749
JP		 2264static void manage_tempaddrs(struct inet6_dev *idev,
2265 struct inet6_ifaddr *ifp,
2266 __u32 valid_lft, __u32 prefered_lft,
2267 bool create, unsigned long now)
2268{
2269 u32 flags;
2270 struct inet6_ifaddr *ift;
2271
2272 read_lock_bh(&idev->lock);
2273 /* update all temporary addresses in the list */
2274 list_for_each_entry(ift, &idev->tempaddr_list, tmp_list) {
2275 int age, max_valid, max_prefered;
2276
2277 if (ifp != ift->ifpub)
2278 continue;
2279
2280 /* RFC 4941 section 3.3:
2281 * If a received option will extend the lifetime of a public
2282 * address, the lifetimes of temporary addresses should
2283 * be extended, subject to the overall constraint that no
2284 * temporary addresses should ever remain "valid" or "preferred"
2285 * for a time longer than (TEMP_VALID_LIFETIME) or
2286 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), respectively.
2287 */
2288 age = (now - ift->cstamp) / HZ;
2289 max_valid = idev->cnf.temp_valid_lft - age;
2290 if (max_valid < 0)
2291 max_valid = 0;
2292
2293 max_prefered = idev->cnf.temp_prefered_lft -
2294 idev->cnf.max_desync_factor - age;
2295 if (max_prefered < 0)
2296 max_prefered = 0;
2297
2298 if (valid_lft > max_valid)
2299 valid_lft = max_valid;
2300
2301 if (prefered_lft > max_prefered)
2302 prefered_lft = max_prefered;
2303
2304 spin_lock(&ift->lock);
2305 flags = ift->flags;
2306 ift->valid_lft = valid_lft;
2307 ift->prefered_lft = prefered_lft;
2308 ift->tstamp = now;
2309 if (prefered_lft > 0)
2310 ift->flags &= ~IFA_F_DEPRECATED;
2311
2312 spin_unlock(&ift->lock);
2313 if (!(flags&IFA_F_TENTATIVE))
2314 ipv6_ifa_notify(0, ift);
2315 }
2316
2317 if ((create || list_empty(&idev->tempaddr_list)) &&
2318 idev->cnf.use_tempaddr > 0) {
2319 /* When a new public address is created as described
2320 * in [ADDRCONF], also create a new temporary address.
2321 * Also create a temporary address if it's enabled but
2322 * no temporary address currently exists.
2323 */
2324 read_unlock_bh(&idev->lock);
2325 ipv6_create_tempaddr(ifp, NULL);
2326 } else {
2327 read_unlock_bh(&idev->lock);
2328 }
2329}
2330
cc9da6cc
BM		 2331static bool is_addr_mode_generate_stable(struct inet6_dev *idev)
2332{
2333 return idev->addr_gen_mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY ||
2334 idev->addr_gen_mode == IN6_ADDR_GEN_MODE_RANDOM;
2335}
2336
e6bff995 2337void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao)
1da177e4
LT		 2338{
2339 struct prefix_info *pinfo;
2340 __u32 valid_lft;
2341 __u32 prefered_lft;
2342 int addr_type;
64236f3f 2343 u32 addr_flags = 0;
1da177e4 2344 struct inet6_dev *in6_dev;
56d417b1 2345 struct net *net = dev_net(dev);
1da177e4
LT		 2346
2347 pinfo = (struct prefix_info *) opt;
1ab1457c 2348
1da177e4 2349 if (len < sizeof(struct prefix_info)) {
ba3542e1 2350 ADBG("addrconf: prefix option too short\n");
1da177e4
LT		 2351 return;
2352 }
1ab1457c 2353
1da177e4
LT		 2354 /*
2355 * Validation checks ([ADDRCONF], page 19)
2356 */
2357
2358 addr_type = ipv6_addr_type(&pinfo->prefix);
2359
2360 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
2361 return;
2362
2363 valid_lft = ntohl(pinfo->valid);
2364 prefered_lft = ntohl(pinfo->prefered);
2365
2366 if (prefered_lft > valid_lft) {
e87cc472 2367 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n");
1da177e4
LT		 2368 return;
2369 }
2370
2371 in6_dev = in6_dev_get(dev);
2372
63159f29 2373 if (!in6_dev) {
e87cc472
JP		 2374 net_dbg_ratelimited("addrconf: device %s not configured\n",
2375 dev->name);
1da177e4
LT		 2376 return;
2377 }
2378
2379 /*
2380 * Two things going on here:
2381 * 1) Add routes for on-link prefixes
2382 * 2) Configure prefixes with the auto flag set
2383 */
2384
4bed72e4
YH		 2385 if (pinfo->onlink) {
2386 struct rt6_info *rt;
2387 unsigned long rt_expires;
2388
6f704992
YH		 2389 /* Avoid arithmetic overflow. Really, we could
2390 * save rt_expires in seconds, likely valid_lft,
2391 * but it would require division in fib gc, that it
2392 * not good.
2393 */
4bed72e4
YH		 2394 if (HZ > USER_HZ)
2395 rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
2396 else
2397 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
3dd4bc68 2398
4bed72e4
YH		 2399 if (addrconf_finite_timeout(rt_expires))
2400 rt_expires *= HZ;
1da177e4 2401
14ef37b6
AH		 2402 rt = addrconf_get_prefix_route(&pinfo->prefix,
2403 pinfo->prefix_len,
2404 dev,
2405 RTF_ADDRCONF | RTF_PREFIX_RT,
2406 RTF_GATEWAY | RTF_DEFAULT);
1da177e4 2407
14ef37b6 2408 if (rt) {
6f704992
YH		 2409 /* Autoconf prefix route */
2410 if (valid_lft == 0) {
2411 ip6_del_rt(rt);
2412 rt = NULL;
4bed72e4 2413 } else if (addrconf_finite_timeout(rt_expires)) {
6f704992 2414 /* not infinity */
1716a961 2415 rt6_set_expires(rt, jiffies + rt_expires);
6f704992 2416 } else {
1716a961 2417 rt6_clean_expires(rt);
1da177e4
LT		 2418 }
2419 } else if (valid_lft) {
6f704992 2420 clock_t expires = 0;
4bed72e4
YH		 2421 int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
2422 if (addrconf_finite_timeout(rt_expires)) {
6f704992
YH		 2423 /* not infinity */
2424 flags |= RTF_EXPIRES;
2425 expires = jiffies_to_clock_t(rt_expires);
2426 }
1da177e4 2427 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
6f704992 2428 dev, expires, flags);
1da177e4 2429 }
94e187c0 2430 ip6_rt_put(rt);
1da177e4
LT		 2431 }
2432
2433 /* Try to figure out our local address for this prefix */
2434
2435 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
8e5e8f30 2436 struct inet6_ifaddr *ifp;
1da177e4
LT		 2437 struct in6_addr addr;
2438 int create = 0, update_lft = 0;
617fe29d 2439 bool tokenized = false;
1da177e4
LT		 2440
2441 if (pinfo->prefix_len == 64) {
2442 memcpy(&addr, &pinfo->prefix, 8);
f53adae4
DB		 2443
2444 if (!ipv6_addr_any(&in6_dev->token)) {
2445 read_lock_bh(&in6_dev->lock);
2446 memcpy(addr.s6_addr + 8,
2447 in6_dev->token.s6_addr + 8, 8);
2448 read_unlock_bh(&in6_dev->lock);
617fe29d 2449 tokenized = true;
cc9da6cc 2450 } else if (is_addr_mode_generate_stable(in6_dev) &&
622c81d5
HFS		 2451 !ipv6_generate_stable_address(&addr, 0,
2452 in6_dev)) {
64236f3f 2453 addr_flags |= IFA_F_STABLE_PRIVACY;
622c81d5 2454 goto ok;
f53adae4
DB		 2455 } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
2456 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
1da177e4
LT		 2457 in6_dev_put(in6_dev);
2458 return;
2459 }
2460 goto ok;
2461 }
e87cc472
JP		 2462 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n",
2463 pinfo->prefix_len);
1da177e4
LT		 2464 in6_dev_put(in6_dev);
2465 return;
2466
2467ok:
2468
53b7997f 2469 ifp = ipv6_get_ifaddr(net, &addr, dev, 1);
1da177e4 2470
63159f29 2471 if (!ifp && valid_lft) {
1da177e4 2472 int max_addresses = in6_dev->cnf.max_addresses;
95c385b4
NH		 2473
2474#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2475 if (in6_dev->cnf.optimistic_dad &&
e6bff995 2476 !net->ipv6.devconf_all->forwarding && sllao)
9a1ec461 2477 addr_flags |= IFA_F_OPTIMISTIC;
95c385b4 2478#endif
1da177e4
LT		 2479
2480 /* Do not allow to create too much of autoconfigured
2481 * addresses; this would be too easy way to crash kernel.
2482 */
2483 if (!max_addresses ||
2484 ipv6_count_addresses(in6_dev) < max_addresses)
3f8f5298
JP		 2485 ifp = ipv6_add_addr(in6_dev, &addr, NULL,
2486 pinfo->prefix_len,
95c385b4 2487 addr_type&IPV6_ADDR_SCOPE_MASK,
8a226b2c
JB		 2488 addr_flags, valid_lft,
2489 prefered_lft);
1da177e4 2490
3f0d2ba0 2491 if (IS_ERR_OR_NULL(ifp)) {
1da177e4
LT		 2492 in6_dev_put(in6_dev);
2493 return;
2494 }
2495
8a226b2c
JB		 2496 update_lft = 0;
2497 create = 1;
c15b1cca
HFS		 2498 spin_lock_bh(&ifp->lock);
2499 ifp->flags |= IFA_F_MANAGETEMPADDR;
1da177e4 2500 ifp->cstamp = jiffies;
617fe29d 2501 ifp->tokenized = tokenized;
c15b1cca 2502 spin_unlock_bh(&ifp->lock);
cf22f9a2 2503 addrconf_dad_start(ifp);
1da177e4
LT		 2504 }
2505
2506 if (ifp) {
479840ff 2507 u32 flags;
1da177e4 2508 unsigned long now;
1da177e4
LT		 2509 u32 stored_lft;
2510
2511 /* update lifetime (RFC2462 5.5.3 e) */
8e8e676d 2512 spin_lock_bh(&ifp->lock);
1da177e4
LT		 2513 now = jiffies;
2514 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
2515 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
2516 else
2517 stored_lft = 0;
8a226b2c 2518 if (!update_lft && !create && stored_lft) {
9451a304
FF		 2519 const u32 minimum_lft = min_t(u32,
2520 stored_lft, MIN_VALID_LIFETIME);
c9d55d5b
PM		 2521 valid_lft = max(valid_lft, minimum_lft);
2522
2523 /* RFC4862 Section 5.5.3e:
2524 * "Note that the preferred lifetime of the
2525 * corresponding address is always reset to
2526 * the Preferred Lifetime in the received
2527 * Prefix Information option, regardless of
2528 * whether the valid lifetime is also reset or
2529 * ignored."
2530 *
2531 * So we should always update prefered_lft here.
2532 */
2533 update_lft = 1;
1da177e4
LT		 2534 }
2535
2536 if (update_lft) {
2537 ifp->valid_lft = valid_lft;
2538 ifp->prefered_lft = prefered_lft;
2539 ifp->tstamp = now;
2540 flags = ifp->flags;
2541 ifp->flags &= ~IFA_F_DEPRECATED;
8e8e676d 2542 spin_unlock_bh(&ifp->lock);
1da177e4
LT		 2543
2544 if (!(flags&IFA_F_TENTATIVE))
2545 ipv6_ifa_notify(0, ifp);
2546 } else
8e8e676d 2547 spin_unlock_bh(&ifp->lock);
1da177e4 2548
53bd6749
JP		 2549 manage_tempaddrs(in6_dev, ifp, valid_lft, prefered_lft,
2550 create, now);
5d9efa7e 2551
1da177e4 2552 in6_ifa_put(ifp);
c15b1cca 2553 addrconf_verify();
1da177e4
LT		 2554 }
2555 }
2556 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
2557 in6_dev_put(in6_dev);
2558}
2559
2560/*
2561 * Set destination address.
2562 * Special case for SIT interfaces where we create a new "virtual"
2563 * device.
2564 */
af284937 2565int addrconf_set_dstaddr(struct net *net, void __user *arg)
1da177e4
LT		 2566{
2567 struct in6_ifreq ireq;
2568 struct net_device *dev;
2569 int err = -EINVAL;
2570
2571 rtnl_lock();
2572
2573 err = -EFAULT;
2574 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2575 goto err_exit;
2576
af284937 2577 dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
1da177e4
LT		 2578
2579 err = -ENODEV;
63159f29 2580 if (!dev)
1da177e4
LT		 2581 goto err_exit;
2582
07a93626 2583#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4 2584 if (dev->type == ARPHRD_SIT) {
5bc3eb7e 2585 const struct net_device_ops *ops = dev->netdev_ops;
1da177e4 2586 struct ifreq ifr;
1da177e4
LT		 2587 struct ip_tunnel_parm p;
2588
2589 err = -EADDRNOTAVAIL;
2590 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2591 goto err_exit;
2592
2593 memset(&p, 0, sizeof(p));
2594 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2595 p.iph.saddr = 0;
2596 p.iph.version = 4;
2597 p.iph.ihl = 5;
2598 p.iph.protocol = IPPROTO_IPV6;
2599 p.iph.ttl = 64;
d20b3109 2600 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
1da177e4 2601
5bc3eb7e
SH		 2602 if (ops->ndo_do_ioctl) {
2603 mm_segment_t oldfs = get_fs();
2604
2605 set_fs(KERNEL_DS);
2606 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2607 set_fs(oldfs);
2608 } else
2609 err = -EOPNOTSUPP;
1da177e4
LT		 2610
2611 if (err == 0) {
2612 err = -ENOBUFS;
af284937
DL		 2613 dev = __dev_get_by_name(net, p.name);
2614 if (!dev)
1da177e4
LT		 2615 goto err_exit;
2616 err = dev_open(dev);
2617 }
2618 }
0be669bb 2619#endif
1da177e4
LT		 2620
2621err_exit:
2622 rtnl_unlock();
2623 return err;
2624}
2625
93a714d6
MC		 2626static int ipv6_mc_config(struct sock *sk, bool join,
2627 const struct in6_addr *addr, int ifindex)
2628{
2629 int ret;
2630
2631 ASSERT_RTNL();
2632
2633 lock_sock(sk);
2634 if (join)
54ff9ef3 2635 ret = ipv6_sock_mc_join(sk, ifindex, addr);
93a714d6 2636 else
54ff9ef3 2637 ret = ipv6_sock_mc_drop(sk, ifindex, addr);
93a714d6
MC		 2638 release_sock(sk);
2639
2640 return ret;
2641}
2642
1da177e4
LT		 2643/*
2644 * Manual configuration of address on an interface
2645 */
479840ff
JP		 2646static int inet6_addr_add(struct net *net, int ifindex,
2647 const struct in6_addr *pfx,
caeaba79 2648 const struct in6_addr *peer_pfx,
479840ff
JP		 2649 unsigned int plen, __u32 ifa_flags,
2650 __u32 prefered_lft, __u32 valid_lft)
1da177e4
LT		 2651{
2652 struct inet6_ifaddr *ifp;
2653 struct inet6_dev *idev;
2654 struct net_device *dev;
93a714d6
MC		 2655 unsigned long timeout;
2656 clock_t expires;
1da177e4 2657 int scope;
6f704992 2658 u32 flags;
1da177e4
LT		 2659
2660 ASSERT_RTNL();
1ab1457c 2661
24ef0da7
TG		 2662 if (plen > 128)
2663 return -EINVAL;
2664
0778769d
NT		 2665 /* check the lifetime */
2666 if (!valid_lft || prefered_lft > valid_lft)
2667 return -EINVAL;
2668
53bd6749
JP		 2669 if (ifa_flags & IFA_F_MANAGETEMPADDR && plen != 64)
2670 return -EINVAL;
2671
af284937
DL		 2672 dev = __dev_get_by_index(net, ifindex);
2673 if (!dev)
1da177e4 2674 return -ENODEV;
1ab1457c 2675
64e724f6
BH		 2676 idev = addrconf_add_dev(dev);
2677 if (IS_ERR(idev))
2678 return PTR_ERR(idev);
1da177e4 2679
93a714d6
MC		 2680 if (ifa_flags & IFA_F_MCAUTOJOIN) {
2681 int ret = ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2682 true, pfx, ifindex);
2683
2684 if (ret < 0)
2685 return ret;
2686 }
2687
1da177e4
LT		 2688 scope = ipv6_addr_scope(pfx);
2689
4bed72e4
YH		 2690 timeout = addrconf_timeout_fixup(valid_lft, HZ);
2691 if (addrconf_finite_timeout(timeout)) {
2692 expires = jiffies_to_clock_t(timeout * HZ);
2693 valid_lft = timeout;
6f704992 2694 flags = RTF_EXPIRES;
4bed72e4
YH		 2695 } else {
2696 expires = 0;
2697 flags = 0;
2698 ifa_flags |= IFA_F_PERMANENT;
6f704992 2699 }
0778769d 2700
4bed72e4
YH		 2701 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
2702 if (addrconf_finite_timeout(timeout)) {
2703 if (timeout == 0)
2704 ifa_flags |= IFA_F_DEPRECATED;
2705 prefered_lft = timeout;
2706 }
0778769d 2707
8a226b2c
JB		 2708 ifp = ipv6_add_addr(idev, pfx, peer_pfx, plen, scope, ifa_flags,
2709 valid_lft, prefered_lft);
0778769d 2710
1da177e4 2711 if (!IS_ERR(ifp)) {
761aac73
TH		 2712 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) {
2713 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
2714 expires, flags);
2715 }
2716
95c385b4
NH		 2717 /*
2718 * Note that section 3.1 of RFC 4429 indicates
2719 * that the Optimistic flag should not be set for
2720 * manually configured addresses
2721 */
cf22f9a2 2722 addrconf_dad_start(ifp);
53bd6749
JP		 2723 if (ifa_flags & IFA_F_MANAGETEMPADDR)
2724 manage_tempaddrs(idev, ifp, valid_lft, prefered_lft,
2725 true, jiffies);
1da177e4 2726 in6_ifa_put(ifp);
c15b1cca 2727 addrconf_verify_rtnl();
1da177e4 2728 return 0;
93a714d6
MC		 2729 } else if (ifa_flags & IFA_F_MCAUTOJOIN) {
2730 ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2731 false, pfx, ifindex);
1da177e4
LT		 2732 }
2733
2734 return PTR_ERR(ifp);
2735}
2736
6046d5b4
HK		 2737static int inet6_addr_del(struct net *net, int ifindex, u32 ifa_flags,
2738 const struct in6_addr *pfx, unsigned int plen)
1da177e4
LT		 2739{
2740 struct inet6_ifaddr *ifp;
2741 struct inet6_dev *idev;
2742 struct net_device *dev;
1ab1457c 2743
24ef0da7
TG		 2744 if (plen > 128)
2745 return -EINVAL;
2746
af284937
DL		 2747 dev = __dev_get_by_index(net, ifindex);
2748 if (!dev)
1da177e4
LT		 2749 return -ENODEV;
2750
e5d08d71 2751 idev = __in6_dev_get(dev);
63159f29 2752 if (!idev)
1da177e4
LT		 2753 return -ENXIO;
2754
2755 read_lock_bh(&idev->lock);
502a2ffd 2756 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1da177e4
LT		 2757 if (ifp->prefix_len == plen &&
2758 ipv6_addr_equal(pfx, &ifp->addr)) {
2759 in6_ifa_hold(ifp);
2760 read_unlock_bh(&idev->lock);
1ab1457c 2761
6046d5b4
HK		 2762 if (!(ifp->flags & IFA_F_TEMPORARY) &&
2763 (ifa_flags & IFA_F_MANAGETEMPADDR))
2764 manage_tempaddrs(idev, ifp, 0, 0, false,
2765 jiffies);
1da177e4 2766 ipv6_del_addr(ifp);
6046d5b4 2767 addrconf_verify_rtnl();
93a714d6
MC		 2768 if (ipv6_addr_is_multicast(pfx)) {
2769 ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2770 false, pfx, dev->ifindex);
2771 }
1da177e4
LT		 2772 return 0;
2773 }
2774 }
2775 read_unlock_bh(&idev->lock);
2776 return -EADDRNOTAVAIL;
2777}
2778
2779
af284937 2780int addrconf_add_ifaddr(struct net *net, void __user *arg)
1da177e4
LT		 2781{
2782 struct in6_ifreq ireq;
2783 int err;
1ab1457c 2784
af31f412 2785 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1da177e4 2786 return -EPERM;
1ab1457c 2787
1da177e4
LT		 2788 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2789 return -EFAULT;
2790
2791 rtnl_lock();
caeaba79 2792 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, NULL,
af284937
DL		 2793 ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2794 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
1da177e4
LT		 2795 rtnl_unlock();
2796 return err;
2797}
2798
af284937 2799int addrconf_del_ifaddr(struct net *net, void __user *arg)
1da177e4
LT		 2800{
2801 struct in6_ifreq ireq;
2802 int err;
1ab1457c 2803
af31f412 2804 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1da177e4
LT		 2805 return -EPERM;
2806
2807 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2808 return -EFAULT;
2809
2810 rtnl_lock();
6046d5b4 2811 err = inet6_addr_del(net, ireq.ifr6_ifindex, 0, &ireq.ifr6_addr,
af284937 2812 ireq.ifr6_prefixlen);
1da177e4
LT		 2813 rtnl_unlock();
2814 return err;
2815}
2816
b5f348e5
IJ		 2817static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
2818 int plen, int scope)
2819{
2820 struct inet6_ifaddr *ifp;
2821
8a226b2c 2822 ifp = ipv6_add_addr(idev, addr, NULL, plen,
07edd741
HFS		 2823 scope, IFA_F_PERMANENT,
2824 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
b5f348e5
IJ		 2825 if (!IS_ERR(ifp)) {
2826 spin_lock_bh(&ifp->lock);
2827 ifp->flags &= ~IFA_F_TENTATIVE;
2828 spin_unlock_bh(&ifp->lock);
2829 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2830 in6_ifa_put(ifp);
2831 }
2832}
2833
07a93626 2834#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4
LT		 2835static void sit_add_v4_addrs(struct inet6_dev *idev)
2836{
1da177e4
LT		 2837 struct in6_addr addr;
2838 struct net_device *dev;
c346dca1 2839 struct net *net = dev_net(idev->dev);
929c9cf3 2840 int scope, plen;
f0e2acfa 2841 u32 pflags = 0;
1da177e4
LT		 2842
2843 ASSERT_RTNL();
2844
2845 memset(&addr, 0, sizeof(struct in6_addr));
2846 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2847
2848 if (idev->dev->flags&IFF_POINTOPOINT) {
2849 addr.s6_addr32[0] = htonl(0xfe800000);
2850 scope = IFA_LINK;
929c9cf3 2851 plen = 64;
1da177e4
LT		 2852 } else {
2853 scope = IPV6_ADDR_COMPATv4;
929c9cf3 2854 plen = 96;
f0e2acfa 2855 pflags |= RTF_NONEXTHOP;
1da177e4
LT		 2856 }
2857
2858 if (addr.s6_addr32[3]) {
929c9cf3 2859 add_addr(idev, &addr, plen, scope);
f0e2acfa 2860 addrconf_prefix_route(&addr, plen, idev->dev, 0, pflags);
1da177e4
LT		 2861 return;
2862 }
2863
6fda7350 2864 for_each_netdev(net, dev) {
8e5e8f30 2865 struct in_device *in_dev = __in_dev_get_rtnl(dev);
1da177e4 2866 if (in_dev && (dev->flags & IFF_UP)) {
8e5e8f30 2867 struct in_ifaddr *ifa;
1da177e4
LT		 2868
2869 int flag = scope;
2870
2871 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
1da177e4
LT		 2872
2873 addr.s6_addr32[3] = ifa->ifa_local;
2874
2875 if (ifa->ifa_scope == RT_SCOPE_LINK)
2876 continue;
2877 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2878 if (idev->dev->flags&IFF_POINTOPOINT)
2879 continue;
2880 flag |= IFA_HOST;
2881 }
1da177e4 2882
b5f348e5 2883 add_addr(idev, &addr, plen, flag);
f0e2acfa
ND		 2884 addrconf_prefix_route(&addr, plen, idev->dev, 0,
2885 pflags);
1da177e4
LT		 2886 }
2887 }
1ab1457c 2888 }
1da177e4 2889}
0be669bb 2890#endif
1da177e4
LT		 2891
2892static void init_loopback(struct net_device *dev)
2893{
2894 struct inet6_dev *idev;
25fb6ca4
BK		 2895 struct net_device *sp_dev;
2896 struct inet6_ifaddr *sp_ifa;
2897 struct rt6_info *sp_rt;
1da177e4
LT		 2898
2899 /* ::1 */
2900
2901 ASSERT_RTNL();
2902
e5d08d71 2903 idev = ipv6_find_idev(dev);
63159f29 2904 if (!idev) {
91df42be 2905 pr_debug("%s: add_dev failed\n", __func__);
1da177e4
LT		 2906 return;
2907 }
2908
b5f348e5 2909 add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
25fb6ca4
BK		 2910
2911 /* Add routes to other interface's IPv6 addresses */
2912 for_each_netdev(dev_net(dev), sp_dev) {
2913 if (!strcmp(sp_dev->name, dev->name))
2914 continue;
2915
2916 idev = __in6_dev_get(sp_dev);
2917 if (!idev)
2918 continue;
2919
2920 read_lock_bh(&idev->lock);
2921 list_for_each_entry(sp_ifa, &idev->addr_list, if_list) {
2922
2923 if (sp_ifa->flags & (IFA_F_DADFAILED | IFA_F_TENTATIVE))
2924 continue;
2925
33d99113
G		 2926 if (sp_ifa->rt) {
2927 /* This dst has been added to garbage list when
2928 * lo device down, release this obsolete dst and
2929 * reallocate a new router for ifa.
2930 */
2931 if (sp_ifa->rt->dst.obsolete > 0) {
2932 ip6_rt_put(sp_ifa->rt);
2933 sp_ifa->rt = NULL;
2934 } else {
2935 continue;
2936 }
2937 }
a881ae1f 2938
57ec0afe 2939 sp_rt = addrconf_dst_alloc(idev, &sp_ifa->addr, false);
25fb6ca4
BK		 2940
2941 /* Failure cases are ignored */
534c8779
G		 2942 if (!IS_ERR(sp_rt)) {
2943 sp_ifa->rt = sp_rt;
25fb6ca4 2944 ip6_ins_rt(sp_rt);
534c8779 2945 }
25fb6ca4
BK		 2946 }
2947 read_unlock_bh(&idev->lock);
2948 }
1da177e4
LT		 2949}
2950
64236f3f
HFS		 2951static void addrconf_add_linklocal(struct inet6_dev *idev,
2952 const struct in6_addr *addr, u32 flags)
1da177e4 2953{
8e5e8f30 2954 struct inet6_ifaddr *ifp;
64236f3f 2955 u32 addr_flags = flags | IFA_F_PERMANENT;
95c385b4
NH		 2956
2957#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2958 if (idev->cnf.optimistic_dad &&
702beb87 2959 !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
95c385b4
NH		 2960 addr_flags |= IFA_F_OPTIMISTIC;
2961#endif
1da177e4 2962
07edd741
HFS		 2963 ifp = ipv6_add_addr(idev, addr, NULL, 64, IFA_LINK, addr_flags,
2964 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
1da177e4 2965 if (!IS_ERR(ifp)) {
46d48046 2966 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
cf22f9a2 2967 addrconf_dad_start(ifp);
1da177e4
LT		 2968 in6_ifa_put(ifp);
2969 }
2970}
2971
622c81d5
HFS		 2972static bool ipv6_reserved_interfaceid(struct in6_addr address)
2973{
2974 if ((address.s6_addr32[2] | address.s6_addr32[3]) == 0)
2975 return true;
2976
2977 if (address.s6_addr32[2] == htonl(0x02005eff) &&
2978 ((address.s6_addr32[3] & htonl(0xfe000000)) == htonl(0xfe000000)))
2979 return true;
2980
2981 if (address.s6_addr32[2] == htonl(0xfdffffff) &&
2982 ((address.s6_addr32[3] & htonl(0xffffff80)) == htonl(0xffffff80)))
2983 return true;
2984
2985 return false;
2986}
2987
2988static int ipv6_generate_stable_address(struct in6_addr *address,
2989 u8 dad_count,
2990 const struct inet6_dev *idev)
2991{
622c81d5
HFS		 2992 static DEFINE_SPINLOCK(lock);
2993 static __u32 digest[SHA_DIGEST_WORDS];
2994 static __u32 workspace[SHA_WORKSPACE_WORDS];
2995
2996 static union {
2997 char __data[SHA_MESSAGE_BYTES];
2998 struct {
2999 struct in6_addr secret;
ff40217e 3000 __be32 prefix[2];
622c81d5
HFS		 3001 unsigned char hwaddr[MAX_ADDR_LEN];
3002 u8 dad_count;
3003 } __packed;
3004 } data;
3005
3006 struct in6_addr secret;
3007 struct in6_addr temp;
3008 struct net *net = dev_net(idev->dev);
3009
3010 BUILD_BUG_ON(sizeof(data.__data) != sizeof(data));
3011
3012 if (idev->cnf.stable_secret.initialized)
3013 secret = idev->cnf.stable_secret.secret;
3014 else if (net->ipv6.devconf_dflt->stable_secret.initialized)
3015 secret = net->ipv6.devconf_dflt->stable_secret.secret;
3016 else
3017 return -1;
3018
3019retry:
3020 spin_lock_bh(&lock);
3021
3022 sha_init(digest);
3023 memset(&data, 0, sizeof(data));
3024 memset(workspace, 0, sizeof(workspace));
3025 memcpy(data.hwaddr, idev->dev->perm_addr, idev->dev->addr_len);
ff40217e
HFS		 3026 data.prefix[0] = address->s6_addr32[0];
3027 data.prefix[1] = address->s6_addr32[1];
622c81d5
HFS		 3028 data.secret = secret;
3029 data.dad_count = dad_count;
3030
3031 sha_transform(digest, data.__data, workspace);
3032
3033 temp = *address;
ff40217e
HFS		 3034 temp.s6_addr32[2] = (__force __be32)digest[0];
3035 temp.s6_addr32[3] = (__force __be32)digest[1];
622c81d5
HFS		 3036
3037 spin_unlock_bh(&lock);
3038
3039 if (ipv6_reserved_interfaceid(temp)) {
3040 dad_count++;
1855b7c3 3041 if (dad_count > dev_net(idev->dev)->ipv6.sysctl.idgen_retries)
622c81d5
HFS		 3042 return -1;
3043 goto retry;
3044 }
3045
3046 *address = temp;
3047 return 0;
3048}
3049
cc9da6cc
BM		 3050static void ipv6_gen_mode_random_init(struct inet6_dev *idev)
3051{
3052 struct ipv6_stable_secret *s = &idev->cnf.stable_secret;
3053
3054 if (s->initialized)
3055 return;
3056 s = &idev->cnf.stable_secret;
3057 get_random_bytes(&s->secret, sizeof(s->secret));
3058 s->initialized = true;
3059}
3060
bc91b0f0
JP		 3061static void addrconf_addr_gen(struct inet6_dev *idev, bool prefix_route)
3062{
622c81d5
HFS		 3063 struct in6_addr addr;
3064
ca254490
DA		 3065 /* no link local addresses on L3 master devices */
3066 if (netif_is_l3_master(idev->dev))
3067 return;
3068
622c81d5 3069 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
bc91b0f0 3070
cc9da6cc
BM		 3071 switch (idev->addr_gen_mode) {
3072 case IN6_ADDR_GEN_MODE_RANDOM:
3073 ipv6_gen_mode_random_init(idev);
3074 /* fallthrough */
3075 case IN6_ADDR_GEN_MODE_STABLE_PRIVACY:
622c81d5 3076 if (!ipv6_generate_stable_address(&addr, 0, idev))
64236f3f
HFS		 3077 addrconf_add_linklocal(idev, &addr,
3078 IFA_F_STABLE_PRIVACY);
622c81d5
HFS		 3079 else if (prefix_route)
3080 addrconf_prefix_route(&addr, 64, idev->dev, 0, 0);
cc9da6cc
BM		 3081 break;
3082 case IN6_ADDR_GEN_MODE_EUI64:
bc91b0f0
JP		 3083 /* addrconf_add_linklocal also adds a prefix_route and we
3084 * only need to care about prefix routes if ipv6_generate_eui64
3085 * couldn't generate one.
3086 */
3087 if (ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) == 0)
64236f3f 3088 addrconf_add_linklocal(idev, &addr, 0);
bc91b0f0
JP		 3089 else if (prefix_route)
3090 addrconf_prefix_route(&addr, 64, idev->dev, 0, 0);
cc9da6cc
BM		 3091 break;
3092 case IN6_ADDR_GEN_MODE_NONE:
3093 default:
3094 /* will not add any link local address */
3095 break;
bc91b0f0
JP		 3096 }
3097}
3098
1da177e4
LT		 3099static void addrconf_dev_config(struct net_device *dev)
3100{
8e5e8f30 3101 struct inet6_dev *idev;
1da177e4
LT		 3102
3103 ASSERT_RTNL();
3104
74235a25
HX		 3105 if ((dev->type != ARPHRD_ETHER) &&
3106 (dev->type != ARPHRD_FDDI) &&
74235a25 3107 (dev->type != ARPHRD_ARCNET) &&
06a4c1c5 3108 (dev->type != ARPHRD_INFINIBAND) &&
e837735e 3109 (dev->type != ARPHRD_IEEE1394) &&
e74bccb8 3110 (dev->type != ARPHRD_TUNNEL6) &&
cc9da6cc
BM		 3111 (dev->type != ARPHRD_6LOWPAN) &&
3112 (dev->type != ARPHRD_NONE)) {
74235a25
HX		 3113 /* Alas, we support only Ethernet autoconfiguration. */
3114 return;
3115 }
3116
1da177e4 3117 idev = addrconf_add_dev(dev);
64e724f6 3118 if (IS_ERR(idev))
1da177e4
LT		 3119 return;
3120
cc9da6cc
BM		 3121 /* this device type has no EUI support */
3122 if (dev->type == ARPHRD_NONE &&
3123 idev->addr_gen_mode == IN6_ADDR_GEN_MODE_EUI64)
3124 idev->addr_gen_mode = IN6_ADDR_GEN_MODE_RANDOM;
3125
bc91b0f0 3126 addrconf_addr_gen(idev, false);
1da177e4
LT		 3127}
3128
07a93626 3129#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4
LT		 3130static void addrconf_sit_config(struct net_device *dev)
3131{
3132 struct inet6_dev *idev;
3133
3134 ASSERT_RTNL();
3135
1ab1457c
YH		 3136 /*
3137 * Configure the tunnel with one of our IPv4
3138 * addresses... we should configure all of
1da177e4
LT		 3139 * our v4 addrs in the tunnel
3140 */
3141
e5d08d71 3142 idev = ipv6_find_idev(dev);
63159f29 3143 if (!idev) {
91df42be 3144 pr_debug("%s: add_dev failed\n", __func__);
1da177e4
LT		 3145 return;
3146 }
3147
c7dc89c0 3148 if (dev->priv_flags & IFF_ISATAP) {
bc91b0f0 3149 addrconf_addr_gen(idev, false);
c7dc89c0
FT		 3150 return;
3151 }
3152
1da177e4
LT		 3153 sit_add_v4_addrs(idev);
3154
62b54dd9 3155 if (dev->flags&IFF_POINTOPOINT)
1da177e4 3156 addrconf_add_mroute(dev);
1da177e4 3157}
0be669bb 3158#endif
1da177e4 3159
07a93626 3160#if IS_ENABLED(CONFIG_NET_IPGRE)
aee80b54 3161static void addrconf_gre_config(struct net_device *dev)
3162{
3163 struct inet6_dev *idev;
aee80b54 3164
aee80b54 3165 ASSERT_RTNL();
3166
e5d08d71 3167 idev = ipv6_find_idev(dev);
63159f29 3168 if (!idev) {
91df42be 3169 pr_debug("%s: add_dev failed\n", __func__);
aee80b54 3170 return;
3171 }
3172
bc91b0f0 3173 addrconf_addr_gen(idev, true);
d9e4ce65
HFS		 3174 if (dev->flags & IFF_POINTOPOINT)
3175 addrconf_add_mroute(dev);
aee80b54 3176}
3177#endif
3178
6a923934
DM		 3179#if IS_ENABLED(CONFIG_NET_L3_MASTER_DEV)
3180/* If the host route is cached on the addr struct make sure it is associated
3181 * with the proper table. e.g., enslavement can change and if so the cached
3182 * host route needs to move to the new table.
3183 */
3184static void l3mdev_check_host_rt(struct inet6_dev *idev,
3185 struct inet6_ifaddr *ifp)
3186{
3187 if (ifp->rt) {
3188 u32 tb_id = l3mdev_fib_table(idev->dev) ? : RT6_TABLE_LOCAL;
3189
3190 if (tb_id != ifp->rt->rt6i_table->tb6_id) {
3191 ip6_del_rt(ifp->rt);
3192 ifp->rt = NULL;
3193 }
3194 }
3195}
3196#else
3197static void l3mdev_check_host_rt(struct inet6_dev *idev,
3198 struct inet6_ifaddr *ifp)
3199{
3200}
3201#endif
3202
3203static int fixup_permanent_addr(struct inet6_dev *idev,
3204 struct inet6_ifaddr *ifp)
3205{
3206 l3mdev_check_host_rt(idev, ifp);
3207
3208 if (!ifp->rt) {
3209 struct rt6_info *rt;
3210
3211 rt = addrconf_dst_alloc(idev, &ifp->addr, false);
3212 if (unlikely(IS_ERR(rt)))
3213 return PTR_ERR(rt);
3214
3215 ifp->rt = rt;
3216 }
3217
3218 if (!(ifp->flags & IFA_F_NOPREFIXROUTE)) {
3219 addrconf_prefix_route(&ifp->addr, ifp->prefix_len,
3220 idev->dev, 0, 0);
3221 }
3222
3223 addrconf_dad_start(ifp);
3224
3225 return 0;
3226}
3227
3228static void addrconf_permanent_addr(struct net_device *dev)
3229{
3230 struct inet6_ifaddr *ifp, *tmp;
3231 struct inet6_dev *idev;
3232
3233 idev = __in6_dev_get(dev);
3234 if (!idev)
3235 return;
3236
3237 write_lock_bh(&idev->lock);
3238
3239 list_for_each_entry_safe(ifp, tmp, &idev->addr_list, if_list) {
3240 if ((ifp->flags & IFA_F_PERMANENT) &&
3241 fixup_permanent_addr(idev, ifp) < 0) {
3242 write_unlock_bh(&idev->lock);
3243 ipv6_del_addr(ifp);
3244 write_lock_bh(&idev->lock);
3245
3246 net_info_ratelimited("%s: Failed to add prefix route for address %pI6c; dropping\n",
3247 idev->dev->name, &ifp->addr);
3248 }
3249 }
3250
3251 write_unlock_bh(&idev->lock);
3252}
3253
1ab1457c 3254static int addrconf_notify(struct notifier_block *this, unsigned long event,
351638e7 3255 void *ptr)
1da177e4 3256{
351638e7 3257 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
4f7f34ea 3258 struct netdev_notifier_changeupper_info *info;
748e2d93 3259 struct inet6_dev *idev = __in6_dev_get(dev);
c5e33bdd 3260 int run_pending = 0;
b217d616 3261 int err;
1da177e4 3262
e21e8467 3263 switch (event) {
45ba9dd2 3264 case NETDEV_REGISTER:
74235a25 3265 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
45ba9dd2 3266 idev = ipv6_add_dev(dev);
a317a2f1
WC		 3267 if (IS_ERR(idev))
3268 return notifier_from_errno(PTR_ERR(idev));
45ba9dd2
YH		 3269 }
3270 break;
bcdd553f 3271
b7b0b1d2
AD		 3272 case NETDEV_CHANGEMTU:
3273 /* if MTU under IPV6_MIN_MTU stop IPv6 on this interface. */
3274 if (dev->mtu < IPV6_MIN_MTU) {
3275 addrconf_ifdown(dev, 1);
3276 break;
3277 }
3278
3279 if (idev) {
3280 rt6_mtu_change(dev, dev->mtu);
3281 idev->cnf.mtu6 = dev->mtu;
3282 break;
3283 }
3284
3285 /* allocate new idev */
3286 idev = ipv6_add_dev(dev);
3287 if (IS_ERR(idev))
3288 break;
3289
3290 /* device is still not ready */
3291 if (!(idev->if_flags & IF_READY))
3292 break;
3293
3294 run_pending = 1;
3295
3296 /* fall through */
3297
1da177e4 3298 case NETDEV_UP:
3c21edbd 3299 case NETDEV_CHANGE:
c2edacf8
JV		 3300 if (dev->flags & IFF_SLAVE)
3301 break;
3302
3ce62a84
WC		 3303 if (idev && idev->cnf.disable_ipv6)
3304 break;
3305
3c21edbd 3306 if (event == NETDEV_UP) {
f24e3d65 3307 if (!addrconf_qdisc_ok(dev)) {
3c21edbd 3308 /* device is not ready yet. */
f3213831 3309 pr_info("ADDRCONF(NETDEV_UP): %s: link is not ready\n",
3c21edbd
YH		 3310 dev->name);
3311 break;
3312 }
99081049 3313
d31c7b8f
EP		 3314 if (!idev && dev->mtu >= IPV6_MIN_MTU)
3315 idev = ipv6_add_dev(dev);
3316
a317a2f1 3317 if (!IS_ERR_OR_NULL(idev)) {
99081049 3318 idev->if_flags |= IF_READY;
e3ec6cfc
BT		 3319 run_pending = 1;
3320 }
b7b0b1d2 3321 } else if (event == NETDEV_CHANGE) {
f24e3d65 3322 if (!addrconf_qdisc_ok(dev)) {
3c21edbd
YH		 3323 /* device is still not ready. */
3324 break;
3325 }
3326
3327 if (idev) {
bcdd553f 3328 if (idev->if_flags & IF_READY)
3c21edbd
YH		 3329 /* device is already configured. */
3330 break;
3c21edbd
YH		 3331 idev->if_flags |= IF_READY;
3332 }
3333
f3213831
JP		 3334 pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n",
3335 dev->name);
3c21edbd 3336
c5e33bdd 3337 run_pending = 1;
3c21edbd
YH		 3338 }
3339
6a923934
DM		 3340 /* restore routes for permanent addresses */
3341 addrconf_permanent_addr(dev);
3342
e21e8467 3343 switch (dev->type) {
07a93626 3344#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4
LT		 3345 case ARPHRD_SIT:
3346 addrconf_sit_config(dev);
3347 break;
aee80b54 3348#endif
07a93626 3349#if IS_ENABLED(CONFIG_NET_IPGRE)
aee80b54 3350 case ARPHRD_IPGRE:
3351 addrconf_gre_config(dev);
3352 break;
0be669bb 3353#endif
1da177e4
LT		 3354 case ARPHRD_LOOPBACK:
3355 init_loopback(dev);
3356 break;
3357
3358 default:
3359 addrconf_dev_config(dev);
3360 break;
3ff50b79 3361 }
bcdd553f 3362
a317a2f1 3363 if (!IS_ERR_OR_NULL(idev)) {
c5e33bdd
YH		 3364 if (run_pending)
3365 addrconf_dad_run(idev);
3366
bcdd553f
SH		 3367 /*
3368 * If the MTU changed during the interface down,
3369 * when the interface up, the changed MTU must be
3370 * reflected in the idev as well as routers.
1da177e4 3371 */
bcdd553f
SH		 3372 if (idev->cnf.mtu6 != dev->mtu &&
3373 dev->mtu >= IPV6_MIN_MTU) {
1da177e4
LT		 3374 rt6_mtu_change(dev, dev->mtu);
3375 idev->cnf.mtu6 = dev->mtu;
3376 }
3377 idev->tstamp = jiffies;
3378 inet6_ifinfo_notify(RTM_NEWLINK, idev);
bcdd553f
SH		 3379
3380 /*
3381 * If the changed mtu during down is lower than
3382 * IPV6_MIN_MTU stop IPv6 on this interface.
1da177e4
LT		 3383 */
3384 if (dev->mtu < IPV6_MIN_MTU)
bcdd553f 3385 addrconf_ifdown(dev, 1);
1da177e4
LT		 3386 }
3387 break;
3388
1da177e4
LT		 3389 case NETDEV_DOWN:
3390 case NETDEV_UNREGISTER:
3391 /*
3392 * Remove all addresses from this interface.
3393 */
3394 addrconf_ifdown(dev, event != NETDEV_DOWN);
3395 break;
3c21edbd 3396
1da177e4 3397 case NETDEV_CHANGENAME:
1da177e4 3398 if (idev) {
5632c515 3399 snmp6_unregister_dev(idev);
408c4768 3400 addrconf_sysctl_unregister(idev);
a317a2f1 3401 err = addrconf_sysctl_register(idev);
b217d616
HX		 3402 if (err)
3403 return notifier_from_errno(err);
a317a2f1
WC		 3404 err = snmp6_register_dev(idev);
3405 if (err) {
3406 addrconf_sysctl_unregister(idev);
3407 return notifier_from_errno(err);
3408 }
5632c515 3409 }
1da177e4 3410 break;
bcdd553f 3411
93d9b7d7
JP		 3412 case NETDEV_PRE_TYPE_CHANGE:
3413 case NETDEV_POST_TYPE_CHANGE:
3ef0952c
AL		 3414 if (idev)
3415 addrconf_type_change(dev, event);
75c78500 3416 break;
4f7f34ea
DA		 3417
3418 case NETDEV_CHANGEUPPER:
3419 info = ptr;
3420
3421 /* flush all routes if dev is linked to or unlinked from
3422 * an L3 master device (e.g., VRF)
3423 */
3424 if (info->upper_dev && netif_is_l3_master(info->upper_dev))
3425 addrconf_ifdown(dev, 0);
3ff50b79 3426 }
1da177e4
LT		 3427
3428 return NOTIFY_OK;
3429}
3430
3431/*
3432 * addrconf module should be notified of a device going up
3433 */
3434static struct notifier_block ipv6_dev_notf = {
3435 .notifier_call = addrconf_notify,
1da177e4
LT		 3436};
3437
93d9b7d7 3438static void addrconf_type_change(struct net_device *dev, unsigned long event)
75c78500
MS		 3439{
3440 struct inet6_dev *idev;
3441 ASSERT_RTNL();
3442
3443 idev = __in6_dev_get(dev);
3444
93d9b7d7 3445 if (event == NETDEV_POST_TYPE_CHANGE)
75c78500 3446 ipv6_mc_remap(idev);
93d9b7d7 3447 else if (event == NETDEV_PRE_TYPE_CHANGE)
75c78500
MS		 3448 ipv6_mc_unmap(idev);
3449}
3450
6a923934
DM		 3451static bool addr_is_local(const struct in6_addr *addr)
3452{
3453 return ipv6_addr_type(addr) &
3454 (IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK);
3455}
3456
1da177e4
LT		 3457static int addrconf_ifdown(struct net_device *dev, int how)
3458{
c346dca1 3459 struct net *net = dev_net(dev);
502a2ffd 3460 struct inet6_dev *idev;
6a923934
DM		 3461 struct inet6_ifaddr *ifa, *tmp;
3462 struct list_head del_list;
3463 int _keep_addr;
3464 bool keep_addr;
73a8bd74 3465 int state, i;
1da177e4
LT		 3466
3467 ASSERT_RTNL();
3468
73a8bd74
DM		 3469 rt6_ifdown(net, dev);
3470 neigh_ifdown(&nd_tbl, dev);
1da177e4
LT		 3471
3472 idev = __in6_dev_get(dev);
63159f29 3473 if (!idev)
1da177e4
LT		 3474 return -ENODEV;
3475
bcdd553f
SH		 3476 /*
3477 * Step 1: remove reference to ipv6 device from parent device.
3478 * Do not dev_put!
1da177e4 3479 */
439e2385 3480 if (how) {
1da177e4 3481 idev->dead = 1;
8814c4b5
YH		 3482
3483 /* protected by rtnl_lock */
a9b3cd7f 3484 RCU_INIT_POINTER(dev->ip6_ptr, NULL);
1da177e4
LT		 3485
3486 /* Step 1.5: remove snmp6 entry */
3487 snmp6_unregister_dev(idev);
3488
3489 }
3490
6a923934
DM		 3491 /* aggregate the system setting and interface setting */
3492 _keep_addr = net->ipv6.devconf_all->keep_addr_on_down;
3493 if (!_keep_addr)
3494 _keep_addr = idev->cnf.keep_addr_on_down;
3495
3496 /* combine the user config with event to determine if permanent
3497 * addresses are to be removed from address hash table
3498 */
3499 keep_addr = !(how || _keep_addr <= 0);
3500
73a8bd74
DM		 3501 /* Step 2: clear hash table */
3502 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3503 struct hlist_head *h = &inet6_addr_lst[i];
73a8bd74
DM		 3504
3505 spin_lock_bh(&addrconf_hash_lock);
67ba4152 3506restart:
b67bfe0d 3507 hlist_for_each_entry_rcu(ifa, h, addr_lst) {
73a8bd74 3508 if (ifa->idev == idev) {
c15b1cca 3509 addrconf_del_dad_work(ifa);
6a923934
DM		 3510 /* combined flag + permanent flag decide if
3511 * address is retained on a down event
3512 */
3513 if (!keep_addr ||
3514 !(ifa->flags & IFA_F_PERMANENT) ||
3515 addr_is_local(&ifa->addr)) {
3516 hlist_del_init_rcu(&ifa->addr_lst);
3517 goto restart;
3518 }
73a8bd74
DM		 3519 }
3520 }
3521 spin_unlock_bh(&addrconf_hash_lock);
3522 }
3523
1da177e4
LT		 3524 write_lock_bh(&idev->lock);
3525
b7b1bfce
HFS		 3526 addrconf_del_rs_timer(idev);
3527
bcdd553f 3528 /* Step 2: clear flags for stateless addrconf */
439e2385 3529 if (!how)
3c21edbd 3530 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
1da177e4 3531
439e2385 3532 if (how && del_timer(&idev->regen_timer))
1da177e4
LT		 3533 in6_dev_put(idev);
3534
bcdd553f 3535 /* Step 3: clear tempaddr list */
372e6c8f 3536 while (!list_empty(&idev->tempaddr_list)) {
3537 ifa = list_first_entry(&idev->tempaddr_list,
3538 struct inet6_ifaddr, tmp_list);
3539 list_del(&ifa->tmp_list);
1da177e4
LT		 3540 write_unlock_bh(&idev->lock);
3541 spin_lock_bh(&ifa->lock);
3542
3543 if (ifa->ifpub) {
3544 in6_ifa_put(ifa->ifpub);
3545 ifa->ifpub = NULL;
3546 }
3547 spin_unlock_bh(&ifa->lock);
3548 in6_ifa_put(ifa);
3549 write_lock_bh(&idev->lock);
3550 }
8f37ada5 3551
6a923934
DM		 3552 /* re-combine the user config with event to determine if permanent
3553 * addresses are to be removed from the interface list
3554 */
3555 keep_addr = (!how && _keep_addr > 0);
84e8b803 3556
6a923934
DM		 3557 INIT_LIST_HEAD(&del_list);
3558 list_for_each_entry_safe(ifa, tmp, &idev->addr_list, if_list) {
3559 addrconf_del_dad_work(ifa);
f1705ec1 3560
841645b5 3561 write_unlock_bh(&idev->lock);
841645b5 3562 spin_lock_bh(&ifa->lock);
6a923934
DM		 3563
3564 if (keep_addr && (ifa->flags & IFA_F_PERMANENT) &&
3565 !addr_is_local(&ifa->addr)) {
3566 /* set state to skip the notifier below */
3567 state = INET6_IFADDR_STATE_DEAD;
3568 ifa->state = 0;
3569 if (!(ifa->flags & IFA_F_NODAD))
3570 ifa->flags |= IFA_F_TENTATIVE;
3571 } else {
3572 state = ifa->state;
3573 ifa->state = INET6_IFADDR_STATE_DEAD;
3574
3575 list_del(&ifa->if_list);
3576 list_add(&ifa->if_list, &del_list);
3577 }
3578
8e8e676d 3579 spin_unlock_bh(&ifa->lock);
9d82ca98 3580
73a8bd74
DM		 3581 if (state != INET6_IFADDR_STATE_DEAD) {
3582 __ipv6_ifa_notify(RTM_DELADDR, ifa);
f88c91dd 3583 inet6addr_notifier_call_chain(NETDEV_DOWN, ifa);
27bdb2ab 3584 }
8f37ada5 3585
73a8bd74
DM		 3586 write_lock_bh(&idev->lock);
3587 }
8f37ada5 3588
1da177e4
LT		 3589 write_unlock_bh(&idev->lock);
3590
6a923934
DM		 3591 /* now clean up addresses to be removed */
3592 while (!list_empty(&del_list)) {
3593 ifa = list_first_entry(&del_list,
3594 struct inet6_ifaddr, if_list);
3595 list_del(&ifa->if_list);
3596
3597 in6_ifa_put(ifa);
3598 }
3599
381f4dca
SD		 3600 /* Step 5: Discard anycast and multicast list */
3601 if (how) {
3602 ipv6_ac_destroy_dev(idev);
1da177e4 3603 ipv6_mc_destroy_dev(idev);
381f4dca 3604 } else {
1da177e4 3605 ipv6_mc_down(idev);
381f4dca 3606 }
1da177e4 3607
1da177e4 3608 idev->tstamp = jiffies;
1ab1457c 3609
bcdd553f 3610 /* Last: Shot the device (if unregistered) */
439e2385 3611 if (how) {
408c4768 3612 addrconf_sysctl_unregister(idev);
1da177e4
LT		 3613 neigh_parms_release(&nd_tbl, idev->nd_parms);
3614 neigh_ifdown(&nd_tbl, dev);
3615 in6_dev_put(idev);
3616 }
3617 return 0;
3618}
3619
3620static void addrconf_rs_timer(unsigned long data)
3621{
b7b1bfce 3622 struct inet6_dev *idev = (struct inet6_dev *)data;
caf92bc4 3623 struct net_device *dev = idev->dev;
b7b1bfce 3624 struct in6_addr lladdr;
1da177e4 3625
b7b1bfce 3626 write_lock(&idev->lock);
5b2a1953 3627 if (idev->dead || !(idev->if_flags & IF_READY))
1da177e4
LT		 3628 goto out;
3629
9ba2add3 3630 if (!ipv6_accept_ra(idev))
5b2a1953 3631 goto out;
3632
3633 /* Announcement received after solicitation was sent */
3634 if (idev->if_flags & IF_RA_RCVD)
1da177e4 3635 goto out;
1da177e4 3636
b7b1bfce 3637 if (idev->rs_probes++ < idev->cnf.rtr_solicits) {
caf92bc4
CW		 3638 write_unlock(&idev->lock);
3639 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
3640 ndisc_send_rs(dev, &lladdr,
b7b1bfce
HFS		 3641 &in6addr_linklocal_allrouters);
3642 else
caf92bc4 3643 goto put;
1da177e4 3644
caf92bc4 3645 write_lock(&idev->lock);
b7b1bfce
HFS		 3646 /* The wait after the last probe can be shorter */
3647 addrconf_mod_rs_timer(idev, (idev->rs_probes ==
3648 idev->cnf.rtr_solicits) ?
3649 idev->cnf.rtr_solicit_delay :
3650 idev->cnf.rtr_solicit_interval);
1da177e4 3651 } else {
1da177e4
LT		 3652 /*
3653 * Note: we do not support deprecated "all on-link"
3654 * assumption any longer.
3655 */
91df42be 3656 pr_debug("%s: no IPv6 routers present\n", idev->dev->name);
1da177e4
LT		 3657 }
3658
3659out:
b7b1bfce 3660 write_unlock(&idev->lock);
caf92bc4 3661put:
b7b1bfce 3662 in6_dev_put(idev);
1da177e4
LT		 3663}
3664
3665/*
3666 * Duplicate Address Detection
3667 */
3c21edbd
YH		 3668static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
3669{
3670 unsigned long rand_num;
3671 struct inet6_dev *idev = ifp->idev;
3672
95c385b4
NH		 3673 if (ifp->flags & IFA_F_OPTIMISTIC)
3674 rand_num = 0;
3675 else
63862b5b 3676 rand_num = prandom_u32() % (idev->cnf.rtr_solicit_delay ? : 1);
95c385b4 3677
b7b1bfce 3678 ifp->dad_probes = idev->cnf.dad_transmits;
c15b1cca 3679 addrconf_mod_dad_work(ifp, rand_num);
3c21edbd
YH		 3680}
3681
c15b1cca 3682static void addrconf_dad_begin(struct inet6_ifaddr *ifp)
1da177e4
LT		 3683{
3684 struct inet6_dev *idev = ifp->idev;
3685 struct net_device *dev = idev->dev;
16186a82 3686 bool notify = false;
1da177e4
LT		 3687
3688 addrconf_join_solict(dev, &ifp->addr);
3689
63862b5b 3690 prandom_seed((__force u32) ifp->addr.s6_addr32[3]);
1da177e4
LT		 3691
3692 read_lock_bh(&idev->lock);
622ccdf1 3693 spin_lock(&ifp->lock);
e9d3e084 3694 if (ifp->state == INET6_IFADDR_STATE_DEAD)
1da177e4 3695 goto out;
1da177e4
LT		 3696
3697 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
1b34be74 3698 idev->cnf.accept_dad < 1 ||
55ebaef1
NT		 3699 !(ifp->flags&IFA_F_TENTATIVE) ||
3700 ifp->flags & IFA_F_NODAD) {
cc411d0b 3701 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
21809faf 3702 spin_unlock(&ifp->lock);
1da177e4
LT		 3703 read_unlock_bh(&idev->lock);
3704
3705 addrconf_dad_completed(ifp);
3706 return;
3707 }
3708
6732bade 3709 if (!(idev->if_flags & IF_READY)) {
21809faf 3710 spin_unlock(&ifp->lock);
6732bade 3711 read_unlock_bh(&idev->lock);
3c21edbd 3712 /*
590a9887 3713 * If the device is not ready:
3c21edbd
YH		 3714 * - keep it tentative if it is a permanent address.
3715 * - otherwise, kill it.
3716 */
3717 in6_ifa_hold(ifp);
cc411d0b 3718 addrconf_dad_stop(ifp, 0);
6732bade 3719 return;
3c21edbd 3720 }
95c385b4
NH		 3721
3722 /*
3723 * Optimistic nodes can start receiving
3724 * Frames right away
3725 */
7fd2561e 3726 if (ifp->flags & IFA_F_OPTIMISTIC) {
95c385b4 3727 ip6_ins_rt(ifp->rt);
7fd2561e
EK		 3728 if (ipv6_use_optimistic_addr(idev)) {
3729 /* Because optimistic nodes can use this address,
3730 * notify listeners. If DAD fails, RTM_DELADDR is sent.
3731 */
16186a82 3732 notify = true;
7fd2561e
EK		 3733 }
3734 }
95c385b4 3735
6732bade 3736 addrconf_dad_kick(ifp);
1da177e4 3737out:
622ccdf1 3738 spin_unlock(&ifp->lock);
1da177e4 3739 read_unlock_bh(&idev->lock);
16186a82 3740 if (notify)
3741 ipv6_ifa_notify(RTM_NEWADDR, ifp);
1da177e4
LT		 3742}
3743
c15b1cca 3744static void addrconf_dad_start(struct inet6_ifaddr *ifp)
1da177e4 3745{
c15b1cca
HFS		 3746 bool begin_dad = false;
3747
8e8e676d 3748 spin_lock_bh(&ifp->lock);
c15b1cca
HFS		 3749 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
3750 ifp->state = INET6_IFADDR_STATE_PREDAD;
3751 begin_dad = true;
3752 }
8e8e676d 3753 spin_unlock_bh(&ifp->lock);
c15b1cca
HFS		 3754
3755 if (begin_dad)
3756 addrconf_mod_dad_work(ifp, 0);
3757}
3758
3759static void addrconf_dad_work(struct work_struct *w)
3760{
3761 struct inet6_ifaddr *ifp = container_of(to_delayed_work(w),
3762 struct inet6_ifaddr,
3763 dad_work);
1da177e4 3764 struct inet6_dev *idev = ifp->idev;
1da177e4
LT		 3765 struct in6_addr mcaddr;
3766
c15b1cca
HFS		 3767 enum {
3768 DAD_PROCESS,
3769 DAD_BEGIN,
3770 DAD_ABORT,
3771 } action = DAD_PROCESS;
3772
3773 rtnl_lock();
3774
8e8e676d 3775 spin_lock_bh(&ifp->lock);
c15b1cca
HFS		 3776 if (ifp->state == INET6_IFADDR_STATE_PREDAD) {
3777 action = DAD_BEGIN;
3778 ifp->state = INET6_IFADDR_STATE_DAD;
3779 } else if (ifp->state == INET6_IFADDR_STATE_ERRDAD) {
3780 action = DAD_ABORT;
3781 ifp->state = INET6_IFADDR_STATE_POSTDAD;
3782 }
8e8e676d 3783 spin_unlock_bh(&ifp->lock);
c15b1cca
HFS		 3784
3785 if (action == DAD_BEGIN) {
3786 addrconf_dad_begin(ifp);
3787 goto out;
3788 } else if (action == DAD_ABORT) {
3789 addrconf_dad_stop(ifp, 1);
3790 goto out;
3791 }
3792
b7b1bfce 3793 if (!ifp->dad_probes && addrconf_dad_end(ifp))
f2344a13
HX		 3794 goto out;
3795
c15b1cca 3796 write_lock_bh(&idev->lock);
122e4519 3797 if (idev->dead || !(idev->if_flags & IF_READY)) {
c15b1cca 3798 write_unlock_bh(&idev->lock);
1da177e4
LT		 3799 goto out;
3800 }
21809faf 3801
3802 spin_lock(&ifp->lock);
622ccdf1
HX		 3803 if (ifp->state == INET6_IFADDR_STATE_DEAD) {
3804 spin_unlock(&ifp->lock);
c15b1cca 3805 write_unlock_bh(&idev->lock);
622ccdf1
HX		 3806 goto out;
3807 }
3808
b7b1bfce 3809 if (ifp->dad_probes == 0) {
1da177e4
LT		 3810 /*
3811 * DAD was successful
3812 */
3813
cc411d0b 3814 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
21809faf 3815 spin_unlock(&ifp->lock);
c15b1cca 3816 write_unlock_bh(&idev->lock);
1da177e4
LT		 3817
3818 addrconf_dad_completed(ifp);
3819
3820 goto out;
3821 }
3822
b7b1bfce 3823 ifp->dad_probes--;
c15b1cca
HFS		 3824 addrconf_mod_dad_work(ifp,
3825 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME));
21809faf 3826 spin_unlock(&ifp->lock);
c15b1cca 3827 write_unlock_bh(&idev->lock);
1da177e4
LT		 3828
3829 /* send a neighbour solicitation for our addr */
1da177e4 3830 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
304d888b 3831 ndisc_send_ns(ifp->idev->dev, &ifp->addr, &mcaddr, &in6addr_any);
1da177e4
LT		 3832out:
3833 in6_ifa_put(ifp);
c15b1cca 3834 rtnl_unlock();
1da177e4
LT		 3835}
3836
11ffff75
HFS		 3837/* ifp->idev must be at least read locked */
3838static bool ipv6_lonely_lladdr(struct inet6_ifaddr *ifp)
3839{
3840 struct inet6_ifaddr *ifpiter;
3841 struct inet6_dev *idev = ifp->idev;
3842
602582ca
HFS		 3843 list_for_each_entry_reverse(ifpiter, &idev->addr_list, if_list) {
3844 if (ifpiter->scope > IFA_LINK)
3845 break;
11ffff75
HFS		 3846 if (ifp != ifpiter && ifpiter->scope == IFA_LINK &&
3847 (ifpiter->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE|
3848 IFA_F_OPTIMISTIC|IFA_F_DADFAILED)) ==
3849 IFA_F_PERMANENT)
3850 return false;
3851 }
3852 return true;
3853}
3854
1da177e4
LT		 3855static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
3856{
e21e8467 3857 struct net_device *dev = ifp->idev->dev;
b7b1bfce 3858 struct in6_addr lladdr;
b173ee48 3859 bool send_rs, send_mld;
b7b1bfce 3860
c15b1cca 3861 addrconf_del_dad_work(ifp);
1da177e4
LT		 3862
3863 /*
3864 * Configure the address for reception. Now it is valid.
3865 */
3866
3867 ipv6_ifa_notify(RTM_NEWADDR, ifp);
3868
026359bc
TA		 3869 /* If added prefix is link local and we are prepared to process
3870 router advertisements, start sending router solicitations.
1da177e4
LT		 3871 */
3872
1ec047eb 3873 read_lock_bh(&ifp->idev->lock);
11ffff75 3874 send_mld = ifp->scope == IFA_LINK && ipv6_lonely_lladdr(ifp);
b173ee48
HFS		 3875 send_rs = send_mld &&
3876 ipv6_accept_ra(ifp->idev) &&
1ec047eb 3877 ifp->idev->cnf.rtr_solicits > 0 &&
b173ee48 3878 (dev->flags&IFF_LOOPBACK) == 0;
1ec047eb
HFS		 3879 read_unlock_bh(&ifp->idev->lock);
3880
b173ee48
HFS		 3881 /* While dad is in progress mld report's source address is in6_addrany.
3882 * Resend with proper ll now.
3883 */
3884 if (send_mld)
3885 ipv6_mc_dad_complete(ifp->idev);
3886
1ec047eb 3887 if (send_rs) {
1da177e4
LT		 3888 /*
3889 * If a host as already performed a random delay
3890 * [...] as part of DAD [...] there is no need
3891 * to delay again before sending the first RS
3892 */
1ec047eb 3893 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
b7b1bfce 3894 return;
1ec047eb 3895 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters);
1da177e4 3896
b7b1bfce
HFS		 3897 write_lock_bh(&ifp->idev->lock);
3898 spin_lock(&ifp->lock);
3899 ifp->idev->rs_probes = 1;
1da177e4 3900 ifp->idev->if_flags |= IF_RS_SENT;
b7b1bfce
HFS		 3901 addrconf_mod_rs_timer(ifp->idev,
3902 ifp->idev->cnf.rtr_solicit_interval);
3903 spin_unlock(&ifp->lock);
3904 write_unlock_bh(&ifp->idev->lock);
1da177e4
LT		 3905 }
3906}
3907
e21e8467
SH		 3908static void addrconf_dad_run(struct inet6_dev *idev)
3909{
c5e33bdd
YH		 3910 struct inet6_ifaddr *ifp;
3911
3912 read_lock_bh(&idev->lock);
502a2ffd 3913 list_for_each_entry(ifp, &idev->addr_list, if_list) {
21809faf 3914 spin_lock(&ifp->lock);
f2344a13
HX		 3915 if (ifp->flags & IFA_F_TENTATIVE &&
3916 ifp->state == INET6_IFADDR_STATE_DAD)
3917 addrconf_dad_kick(ifp);
21809faf 3918 spin_unlock(&ifp->lock);
c5e33bdd
YH		 3919 }
3920 read_unlock_bh(&idev->lock);
3921}
3922
1da177e4
LT		 3923#ifdef CONFIG_PROC_FS
3924struct if6_iter_state {
3c40090a 3925 struct seq_net_private p;
1da177e4 3926 int bucket;
1d578303 3927 int offset;
1da177e4
LT		 3928};
3929
1d578303 3930static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos)
1da177e4
LT		 3931{
3932 struct inet6_ifaddr *ifa = NULL;
3933 struct if6_iter_state *state = seq->private;
1218854a 3934 struct net *net = seq_file_net(seq);
1d578303 3935 int p = 0;
1da177e4 3936
1d578303
MM		 3937 /* initial bucket if pos is 0 */
3938 if (pos == 0) {
3939 state->bucket = 0;
3940 state->offset = 0;
3941 }
3942
3943 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
b67bfe0d 3944 hlist_for_each_entry_rcu_bh(ifa, &inet6_addr_lst[state->bucket],
1d578303 3945 addr_lst) {
9f0d3c27
ED		 3946 if (!net_eq(dev_net(ifa->idev->dev), net))
3947 continue;
1d578303
MM		 3948 /* sync with offset */
3949 if (p < state->offset) {
3950 p++;
3951 continue;
3952 }
3953 state->offset++;
9f0d3c27 3954 return ifa;
1d578303
MM		 3955 }
3956
3957 /* prepare for next bucket */
3958 state->offset = 0;
3959 p = 0;
1da177e4 3960 }
c2e21293 3961 return NULL;
1da177e4
LT		 3962}
3963
c2e21293 3964static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
3965 struct inet6_ifaddr *ifa)
1da177e4
LT		 3966{
3967 struct if6_iter_state *state = seq->private;
1218854a 3968 struct net *net = seq_file_net(seq);
1da177e4 3969
b67bfe0d 3970 hlist_for_each_entry_continue_rcu_bh(ifa, addr_lst) {
9f0d3c27
ED		 3971 if (!net_eq(dev_net(ifa->idev->dev), net))
3972 continue;
1d578303 3973 state->offset++;
9f0d3c27 3974 return ifa;
1d578303 3975 }
3c40090a 3976
c2e21293 3977 while (++state->bucket < IN6_ADDR_HSIZE) {
1d578303 3978 state->offset = 0;
b67bfe0d 3979 hlist_for_each_entry_rcu_bh(ifa,
c2e21293 3980 &inet6_addr_lst[state->bucket], addr_lst) {
9f0d3c27
ED		 3981 if (!net_eq(dev_net(ifa->idev->dev), net))
3982 continue;
1d578303 3983 state->offset++;
9f0d3c27 3984 return ifa;
c2e21293 3985 }
1da177e4 3986 }
3c40090a 3987
c2e21293 3988 return NULL;
1da177e4
LT		 3989}
3990
1da177e4 3991static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
4f70ecca 3992 __acquires(rcu_bh)
1da177e4 3993{
5c578aed 3994 rcu_read_lock_bh();
1d578303 3995 return if6_get_first(seq, *pos);
1da177e4
LT		 3996}
3997
3998static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3999{
4000 struct inet6_ifaddr *ifa;
4001
4002 ifa = if6_get_next(seq, v);
4003 ++*pos;
4004 return ifa;
4005}
4006
4007static void if6_seq_stop(struct seq_file *seq, void *v)
4f70ecca 4008 __releases(rcu_bh)
1da177e4 4009{
5c578aed 4010 rcu_read_unlock_bh();
1da177e4
LT		 4011}
4012
4013static int if6_seq_show(struct seq_file *seq, void *v)
4014{
4015 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
971a351c 4016 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
b071195d 4017 &ifp->addr,
1da177e4
LT		 4018 ifp->idev->dev->ifindex,
4019 ifp->prefix_len,
4020 ifp->scope,
971a351c 4021 (u8) ifp->flags,
1da177e4
LT		 4022 ifp->idev->dev->name);
4023 return 0;
4024}
4025
56b3d975 4026static const struct seq_operations if6_seq_ops = {
1da177e4
LT		 4027 .start = if6_seq_start,
4028 .next = if6_seq_next,
4029 .show = if6_seq_show,
4030 .stop = if6_seq_stop,
4031};
4032
4033static int if6_seq_open(struct inode *inode, struct file *file)
4034{
3c40090a
DL		 4035 return seq_open_net(inode, file, &if6_seq_ops,
4036 sizeof(struct if6_iter_state));
1da177e4
LT		 4037}
4038
9a32144e 4039static const struct file_operations if6_fops = {
1da177e4
LT		 4040 .owner = THIS_MODULE,
4041 .open = if6_seq_open,
4042 .read = seq_read,
4043 .llseek = seq_lseek,
3c40090a 4044 .release = seq_release_net,
1da177e4
LT		 4045};
4046
2c8c1e72 4047static int __net_init if6_proc_net_init(struct net *net)
1da177e4 4048{
d4beaa66 4049 if (!proc_create("if_inet6", S_IRUGO, net->proc_net, &if6_fops))
1da177e4
LT		 4050 return -ENOMEM;
4051 return 0;
4052}
4053
2c8c1e72 4054static void __net_exit if6_proc_net_exit(struct net *net)
3c40090a 4055{
ece31ffd 4056 remove_proc_entry("if_inet6", net->proc_net);
3c40090a
DL		 4057}
4058
4059static struct pernet_operations if6_proc_net_ops = {
67ba4152
IM		 4060 .init = if6_proc_net_init,
4061 .exit = if6_proc_net_exit,
3c40090a
DL		 4062};
4063
4064int __init if6_proc_init(void)
4065{
4066 return register_pernet_subsys(&if6_proc_net_ops);
4067}
4068
1da177e4
LT		 4069void if6_proc_exit(void)
4070{
3c40090a 4071 unregister_pernet_subsys(&if6_proc_net_ops);
1da177e4
LT		 4072}
4073#endif /* CONFIG_PROC_FS */
4074
07a93626 4075#if IS_ENABLED(CONFIG_IPV6_MIP6)
3b9f9a1c 4076/* Check if address is a home address configured on any interface. */
b71d1d42 4077int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr)
3b9f9a1c
NT		 4078{
4079 int ret = 0;
c2e21293 4080 struct inet6_ifaddr *ifp = NULL;
ddbe5032 4081 unsigned int hash = inet6_addr_hash(addr);
c2e21293 4082
5c578aed 4083 rcu_read_lock_bh();
b67bfe0d 4084 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
878628fb 4085 if (!net_eq(dev_net(ifp->idev->dev), net))
389f6612 4086 continue;
caad295f 4087 if (ipv6_addr_equal(&ifp->addr, addr) &&
3b9f9a1c
NT		 4088 (ifp->flags & IFA_F_HOMEADDRESS)) {
4089 ret = 1;
4090 break;
4091 }
4092 }
5c578aed 4093 rcu_read_unlock_bh();
3b9f9a1c
NT		 4094 return ret;
4095}
4096#endif
4097
1da177e4
LT		 4098/*
4099 * Periodic address status verification
4100 */
4101
c15b1cca 4102static void addrconf_verify_rtnl(void)
1da177e4 4103{
b2db7564 4104 unsigned long now, next, next_sec, next_sched;
1da177e4 4105 struct inet6_ifaddr *ifp;
1da177e4
LT		 4106 int i;
4107
c15b1cca
HFS		 4108 ASSERT_RTNL();
4109
5c578aed 4110 rcu_read_lock_bh();
1da177e4 4111 now = jiffies;
b2db7564 4112 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
1da177e4 4113
c15b1cca 4114 cancel_delayed_work(&addr_chk_work);
1da177e4 4115
bcdd553f 4116 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
1da177e4 4117restart:
c15b1cca 4118 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[i], addr_lst) {
1da177e4 4119 unsigned long age;
1da177e4 4120
fad8da3e
YA		 4121 /* When setting preferred_lft to a value not zero or
4122 * infinity, while valid_lft is infinity
4123 * IFA_F_PERMANENT has a non-infinity life time.
4124 */
4125 if ((ifp->flags & IFA_F_PERMANENT) &&
4126 (ifp->prefered_lft == INFINITY_LIFE_TIME))
1da177e4
LT		 4127 continue;
4128
4129 spin_lock(&ifp->lock);
b2db7564
YH		 4130 /* We try to batch several events at once. */
4131 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
1da177e4 4132
8f27ebb9
YH		 4133 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
4134 age >= ifp->valid_lft) {
1da177e4
LT		 4135 spin_unlock(&ifp->lock);
4136 in6_ifa_hold(ifp);
1da177e4
LT		 4137 ipv6_del_addr(ifp);
4138 goto restart;
8f27ebb9
YH		 4139 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
4140 spin_unlock(&ifp->lock);
4141 continue;
1da177e4 4142 } else if (age >= ifp->prefered_lft) {
a1ed0526 4143 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
1da177e4
LT		 4144 int deprecate = 0;
4145
4146 if (!(ifp->flags&IFA_F_DEPRECATED)) {
4147 deprecate = 1;
4148 ifp->flags |= IFA_F_DEPRECATED;
4149 }
4150
fad8da3e
YA		 4151 if ((ifp->valid_lft != INFINITY_LIFE_TIME) &&
4152 (time_before(ifp->tstamp + ifp->valid_lft * HZ, next)))
1da177e4
LT		 4153 next = ifp->tstamp + ifp->valid_lft * HZ;
4154
4155 spin_unlock(&ifp->lock);
4156
4157 if (deprecate) {
4158 in6_ifa_hold(ifp);
1da177e4
LT		 4159
4160 ipv6_ifa_notify(0, ifp);
4161 in6_ifa_put(ifp);
4162 goto restart;
4163 }
1da177e4
LT		 4164 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
4165 !(ifp->flags&IFA_F_TENTATIVE)) {
88949cf4 4166 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
4167 ifp->idev->cnf.dad_transmits *
1f9248e5 4168 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME) / HZ;
88949cf4 4169
1da177e4
LT		 4170 if (age >= ifp->prefered_lft - regen_advance) {
4171 struct inet6_ifaddr *ifpub = ifp->ifpub;
4172 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
4173 next = ifp->tstamp + ifp->prefered_lft * HZ;
4174 if (!ifp->regen_count && ifpub) {
4175 ifp->regen_count++;
4176 in6_ifa_hold(ifp);
4177 in6_ifa_hold(ifpub);
4178 spin_unlock(&ifp->lock);
5c578aed 4179
291d809b
HY		 4180 spin_lock(&ifpub->lock);
4181 ifpub->regen_count = 0;
4182 spin_unlock(&ifpub->lock);
1da177e4
LT		 4183 ipv6_create_tempaddr(ifpub, ifp);
4184 in6_ifa_put(ifpub);
4185 in6_ifa_put(ifp);
4186 goto restart;
4187 }
4188 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
4189 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
4190 spin_unlock(&ifp->lock);
1da177e4
LT		 4191 } else {
4192 /* ifp->prefered_lft <= ifp->valid_lft */
4193 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
4194 next = ifp->tstamp + ifp->prefered_lft * HZ;
4195 spin_unlock(&ifp->lock);
4196 }
4197 }
1da177e4
LT		 4198 }
4199
b2db7564
YH		 4200 next_sec = round_jiffies_up(next);
4201 next_sched = next;
4202
4203 /* If rounded timeout is accurate enough, accept it. */
4204 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
4205 next_sched = next_sec;
4206
4207 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
4208 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
4209 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
4210
ba3542e1 4211 ADBG(KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
4212 now, next, next_sec, next_sched);
c15b1cca 4213 mod_delayed_work(addrconf_wq, &addr_chk_work, next_sched - now);
5c578aed 4214 rcu_read_unlock_bh();
1da177e4
LT		 4215}
4216
c15b1cca
HFS		 4217static void addrconf_verify_work(struct work_struct *w)
4218{
4219 rtnl_lock();
4220 addrconf_verify_rtnl();
4221 rtnl_unlock();
4222}
4223
4224static void addrconf_verify(void)
4225{
4226 mod_delayed_work(addrconf_wq, &addr_chk_work, 0);
4227}
4228
caeaba79
ND		 4229static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local,
4230 struct in6_addr **peer_pfx)
461d8837
TG		 4231{
4232 struct in6_addr *pfx = NULL;
4233
caeaba79
ND		 4234 *peer_pfx = NULL;
4235
461d8837
TG		 4236 if (addr)
4237 pfx = nla_data(addr);
4238
4239 if (local) {
4240 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
caeaba79
ND		 4241 *peer_pfx = pfx;
4242 pfx = nla_data(local);
461d8837
TG		 4243 }
4244
4245 return pfx;
4246}
4247
ef7c79ed 4248static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
461d8837
TG		 4249 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
4250 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
4251 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
479840ff 4252 [IFA_FLAGS] = { .len = sizeof(u32) },
461d8837
TG		 4253};
4254
1da177e4 4255static int
661d2967 4256inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh)
1da177e4 4257{
3b1e0a65 4258 struct net *net = sock_net(skb->sk);
b933f716
TG		 4259 struct ifaddrmsg *ifm;
4260 struct nlattr *tb[IFA_MAX+1];
caeaba79 4261 struct in6_addr *pfx, *peer_pfx;
6046d5b4 4262 u32 ifa_flags;
b933f716 4263 int err;
1da177e4 4264
b933f716
TG		 4265 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
4266 if (err < 0)
4267 return err;
4268
4269 ifm = nlmsg_data(nlh);
caeaba79 4270 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
63159f29 4271 if (!pfx)
1da177e4
LT		 4272 return -EINVAL;
4273
6046d5b4
HK		 4274 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
4275
4276 /* We ignore other flags so far. */
4277 ifa_flags &= IFA_F_MANAGETEMPADDR;
4278
4279 return inet6_addr_del(net, ifm->ifa_index, ifa_flags, pfx,
4280 ifm->ifa_prefixlen);
1da177e4
LT		 4281}
4282
479840ff 4283static int inet6_addr_modify(struct inet6_ifaddr *ifp, u32 ifa_flags,
55ebaef1 4284 u32 prefered_lft, u32 valid_lft)
081bba5b 4285{
6f704992
YH		 4286 u32 flags;
4287 clock_t expires;
4bed72e4 4288 unsigned long timeout;
53bd6749 4289 bool was_managetempaddr;
5b84efec 4290 bool had_prefixroute;
46d48046 4291
c15b1cca
HFS		 4292 ASSERT_RTNL();
4293
081bba5b
NT		 4294 if (!valid_lft || (prefered_lft > valid_lft))
4295 return -EINVAL;
4296
53bd6749
JP		 4297 if (ifa_flags & IFA_F_MANAGETEMPADDR &&
4298 (ifp->flags & IFA_F_TEMPORARY || ifp->prefix_len != 64))
4299 return -EINVAL;
4300
4bed72e4
YH		 4301 timeout = addrconf_timeout_fixup(valid_lft, HZ);
4302 if (addrconf_finite_timeout(timeout)) {
4303 expires = jiffies_to_clock_t(timeout * HZ);
4304 valid_lft = timeout;
6f704992 4305 flags = RTF_EXPIRES;
4bed72e4
YH		 4306 } else {
4307 expires = 0;
4308 flags = 0;
4309 ifa_flags |= IFA_F_PERMANENT;
6f704992 4310 }
081bba5b 4311
4bed72e4
YH		 4312 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
4313 if (addrconf_finite_timeout(timeout)) {
4314 if (timeout == 0)
4315 ifa_flags |= IFA_F_DEPRECATED;
4316 prefered_lft = timeout;
4317 }
081bba5b
NT		 4318
4319 spin_lock_bh(&ifp->lock);
53bd6749 4320 was_managetempaddr = ifp->flags & IFA_F_MANAGETEMPADDR;
5b84efec
TH		 4321 had_prefixroute = ifp->flags & IFA_F_PERMANENT &&
4322 !(ifp->flags & IFA_F_NOPREFIXROUTE);
53bd6749 4323 ifp->flags &= ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD |
761aac73
TH		 4324 IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
4325 IFA_F_NOPREFIXROUTE);
53bd6749 4326 ifp->flags |= ifa_flags;
081bba5b
NT		 4327 ifp->tstamp = jiffies;
4328 ifp->valid_lft = valid_lft;
4329 ifp->prefered_lft = prefered_lft;
4330
4331 spin_unlock_bh(&ifp->lock);
4332 if (!(ifp->flags&IFA_F_TENTATIVE))
4333 ipv6_ifa_notify(0, ifp);
081bba5b 4334
761aac73
TH		 4335 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) {
4336 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
4337 expires, flags);
5b84efec
TH		 4338 } else if (had_prefixroute) {
4339 enum cleanup_prefix_rt_t action;
4340 unsigned long rt_expires;
4341
4342 write_lock_bh(&ifp->idev->lock);
4343 action = check_cleanup_prefix_route(ifp, &rt_expires);
4344 write_unlock_bh(&ifp->idev->lock);
4345
4346 if (action != CLEANUP_PREFIX_RT_NOP) {
4347 cleanup_prefix_route(ifp, rt_expires,
4348 action == CLEANUP_PREFIX_RT_DEL);
4349 }
761aac73 4350 }
53bd6749
JP		 4351
4352 if (was_managetempaddr || ifp->flags & IFA_F_MANAGETEMPADDR) {
4353 if (was_managetempaddr && !(ifp->flags & IFA_F_MANAGETEMPADDR))
4354 valid_lft = prefered_lft = 0;
4355 manage_tempaddrs(ifp->idev, ifp, valid_lft, prefered_lft,
4356 !was_managetempaddr, jiffies);
4357 }
4358
c15b1cca 4359 addrconf_verify_rtnl();
081bba5b
NT		 4360
4361 return 0;
4362}
4363
1da177e4 4364static int
661d2967 4365inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh)
1da177e4 4366{
3b1e0a65 4367 struct net *net = sock_net(skb->sk);
461d8837
TG		 4368 struct ifaddrmsg *ifm;
4369 struct nlattr *tb[IFA_MAX+1];
caeaba79 4370 struct in6_addr *pfx, *peer_pfx;
7198f8ce
TG		 4371 struct inet6_ifaddr *ifa;
4372 struct net_device *dev;
55ebaef1 4373 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
479840ff 4374 u32 ifa_flags;
461d8837 4375 int err;
1da177e4 4376
461d8837
TG		 4377 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
4378 if (err < 0)
4379 return err;
4380
4381 ifm = nlmsg_data(nlh);
caeaba79 4382 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
63159f29 4383 if (!pfx)
1da177e4
LT		 4384 return -EINVAL;
4385
461d8837 4386 if (tb[IFA_CACHEINFO]) {
0778769d 4387 struct ifa_cacheinfo *ci;
461d8837
TG		 4388
4389 ci = nla_data(tb[IFA_CACHEINFO]);
0778769d 4390 valid_lft = ci->ifa_valid;
461d8837
TG		 4391 preferred_lft = ci->ifa_prefered;
4392 } else {
4393 preferred_lft = INFINITY_LIFE_TIME;
4394 valid_lft = INFINITY_LIFE_TIME;
0778769d
NT		 4395 }
4396
af284937 4397 dev = __dev_get_by_index(net, ifm->ifa_index);
63159f29 4398 if (!dev)
7198f8ce
TG		 4399 return -ENODEV;
4400
479840ff
JP		 4401 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
4402
55ebaef1 4403 /* We ignore other flags so far. */
761aac73 4404 ifa_flags &= IFA_F_NODAD | IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
93a714d6 4405 IFA_F_NOPREFIXROUTE | IFA_F_MCAUTOJOIN;
55ebaef1 4406
1cab3da6 4407 ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
63159f29 4408 if (!ifa) {
7198f8ce
TG		 4409 /*
4410 * It would be best to check for !NLM_F_CREATE here but
db9c7c39 4411 * userspace already relies on not having to provide this.
7198f8ce 4412 */
caeaba79 4413 return inet6_addr_add(net, ifm->ifa_index, pfx, peer_pfx,
af284937
DL		 4414 ifm->ifa_prefixlen, ifa_flags,
4415 preferred_lft, valid_lft);
081bba5b
NT		 4416 }
4417
7198f8ce
TG		 4418 if (nlh->nlmsg_flags & NLM_F_EXCL ||
4419 !(nlh->nlmsg_flags & NLM_F_REPLACE))
4420 err = -EEXIST;
4421 else
55ebaef1 4422 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
7198f8ce
TG		 4423
4424 in6_ifa_put(ifa);
4425
4426 return err;
1da177e4
LT		 4427}
4428
479840ff 4429static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u32 flags,
101bb229
TG		 4430 u8 scope, int ifindex)
4431{
4432 struct ifaddrmsg *ifm;
4433
4434 ifm = nlmsg_data(nlh);
4435 ifm->ifa_family = AF_INET6;
4436 ifm->ifa_prefixlen = prefixlen;
4437 ifm->ifa_flags = flags;
4438 ifm->ifa_scope = scope;
4439 ifm->ifa_index = ifindex;
4440}
4441
85486af0
TG		 4442static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
4443 unsigned long tstamp, u32 preferred, u32 valid)
4444{
4445 struct ifa_cacheinfo ci;
4446
18a31e1e
TG		 4447 ci.cstamp = cstamp_delta(cstamp);
4448 ci.tstamp = cstamp_delta(tstamp);
85486af0
TG		 4449 ci.ifa_prefered = preferred;
4450 ci.ifa_valid = valid;
4451
4452 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
4453}
4454
101bb229
TG		 4455static inline int rt_scope(int ifa_scope)
4456{
4457 if (ifa_scope & IFA_HOST)
4458 return RT_SCOPE_HOST;
4459 else if (ifa_scope & IFA_LINK)
4460 return RT_SCOPE_LINK;
4461 else if (ifa_scope & IFA_SITE)
4462 return RT_SCOPE_SITE;
4463 else
4464 return RT_SCOPE_UNIVERSE;
4465}
4466
0ab6803b
TG		 4467static inline int inet6_ifaddr_msgsize(void)
4468{
339bf98f 4469 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
caeaba79 4470 + nla_total_size(16) /* IFA_LOCAL */
339bf98f 4471 + nla_total_size(16) /* IFA_ADDRESS */
479840ff
JP		 4472 + nla_total_size(sizeof(struct ifa_cacheinfo))
4473 + nla_total_size(4) /* IFA_FLAGS */;
0ab6803b 4474}
c5396a31 4475
1da177e4 4476static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
15e47304 4477 u32 portid, u32 seq, int event, unsigned int flags)
1da177e4 4478{
1da177e4 4479 struct nlmsghdr *nlh;
85486af0 4480 u32 preferred, valid;
1da177e4 4481
15e47304 4482 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
63159f29 4483 if (!nlh)
26932566 4484 return -EMSGSIZE;
0ab6803b 4485
101bb229
TG		 4486 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
4487 ifa->idev->dev->ifindex);
4488
fad8da3e
YA		 4489 if (!((ifa->flags&IFA_F_PERMANENT) &&
4490 (ifa->prefered_lft == INFINITY_LIFE_TIME))) {
85486af0
TG		 4491 preferred = ifa->prefered_lft;
4492 valid = ifa->valid_lft;
4493 if (preferred != INFINITY_LIFE_TIME) {
1da177e4 4494 long tval = (jiffies - ifa->tstamp)/HZ;
a1faa698
JR		 4495 if (preferred > tval)
4496 preferred -= tval;
4497 else
4498 preferred = 0;
f56619fc
BH		 4499 if (valid != INFINITY_LIFE_TIME) {
4500 if (valid > tval)
4501 valid -= tval;
4502 else
4503 valid = 0;
4504 }
1da177e4
LT		 4505 }
4506 } else {
85486af0
TG		 4507 preferred = INFINITY_LIFE_TIME;
4508 valid = INFINITY_LIFE_TIME;
4509 }
4510
7996c799 4511 if (!ipv6_addr_any(&ifa->peer_addr)) {
930345ea
JB		 4512 if (nla_put_in6_addr(skb, IFA_LOCAL, &ifa->addr) < 0 ||
4513 nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->peer_addr) < 0)
caeaba79
ND		 4514 goto error;
4515 } else
930345ea 4516 if (nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->addr) < 0)
caeaba79
ND		 4517 goto error;
4518
4519 if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0)
4520 goto error;
1da177e4 4521
479840ff
JP		 4522 if (nla_put_u32(skb, IFA_FLAGS, ifa->flags) < 0)
4523 goto error;
4524
053c095a
JB		 4525 nlmsg_end(skb, nlh);
4526 return 0;
caeaba79
ND		 4527
4528error:
4529 nlmsg_cancel(skb, nlh);
4530 return -EMSGSIZE;
1da177e4
LT		 4531}
4532
4533static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
15e47304 4534 u32 portid, u32 seq, int event, u16 flags)
1da177e4 4535{
1da177e4 4536 struct nlmsghdr *nlh;
101bb229
TG		 4537 u8 scope = RT_SCOPE_UNIVERSE;
4538 int ifindex = ifmca->idev->dev->ifindex;
4539
4540 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
4541 scope = RT_SCOPE_SITE;
1da177e4 4542
15e47304 4543 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
63159f29 4544 if (!nlh)
26932566 4545 return -EMSGSIZE;
85486af0 4546
0ab6803b 4547 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
930345ea 4548 if (nla_put_in6_addr(skb, IFA_MULTICAST, &ifmca->mca_addr) < 0 ||
0ab6803b 4549 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
26932566
PM		 4550 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
4551 nlmsg_cancel(skb, nlh);
4552 return -EMSGSIZE;
4553 }
85486af0 4554
053c095a
JB		 4555 nlmsg_end(skb, nlh);
4556 return 0;
1da177e4
LT		 4557}
4558
4559static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
15e47304 4560 u32 portid, u32 seq, int event, unsigned int flags)
1da177e4 4561{
1da177e4 4562 struct nlmsghdr *nlh;
101bb229
TG		 4563 u8 scope = RT_SCOPE_UNIVERSE;
4564 int ifindex = ifaca->aca_idev->dev->ifindex;
4565
4566 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
4567 scope = RT_SCOPE_SITE;
1da177e4 4568
15e47304 4569 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
63159f29 4570 if (!nlh)
26932566 4571 return -EMSGSIZE;
85486af0 4572
0ab6803b 4573 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
930345ea 4574 if (nla_put_in6_addr(skb, IFA_ANYCAST, &ifaca->aca_addr) < 0 ||
0ab6803b 4575 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
26932566
PM		 4576 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
4577 nlmsg_cancel(skb, nlh);
4578 return -EMSGSIZE;
4579 }
1da177e4 4580
053c095a
JB		 4581 nlmsg_end(skb, nlh);
4582 return 0;
1da177e4
LT		 4583}
4584
e21e8467 4585enum addr_type_t {
1da177e4
LT		 4586 UNICAST_ADDR,
4587 MULTICAST_ADDR,
4588 ANYCAST_ADDR,
4589};
4590
234b27c3
ED		 4591/* called with rcu_read_lock() */
4592static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
4593 struct netlink_callback *cb, enum addr_type_t type,
4594 int s_ip_idx, int *p_ip_idx)
4595{
234b27c3
ED		 4596 struct ifmcaddr6 *ifmca;
4597 struct ifacaddr6 *ifaca;
4598 int err = 1;
4599 int ip_idx = *p_ip_idx;
4600
4601 read_lock_bh(&idev->lock);
4602 switch (type) {
502a2ffd 4603 case UNICAST_ADDR: {
4604 struct inet6_ifaddr *ifa;
4605
234b27c3 4606 /* unicast address incl. temp addr */
502a2ffd 4607 list_for_each_entry(ifa, &idev->addr_list, if_list) {
4608 if (++ip_idx < s_ip_idx)
234b27c3
ED		 4609 continue;
4610 err = inet6_fill_ifaddr(skb, ifa,
15e47304 4611 NETLINK_CB(cb->skb).portid,
234b27c3
ED		 4612 cb->nlh->nlmsg_seq,
4613 RTM_NEWADDR,
4614 NLM_F_MULTI);
053c095a 4615 if (err < 0)
234b27c3 4616 break;
63998ac2 4617 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
234b27c3
ED		 4618 }
4619 break;
502a2ffd 4620 }
234b27c3
ED		 4621 case MULTICAST_ADDR:
4622 /* multicast address */
4623 for (ifmca = idev->mc_list; ifmca;
4624 ifmca = ifmca->next, ip_idx++) {
4625 if (ip_idx < s_ip_idx)
4626 continue;
4627 err = inet6_fill_ifmcaddr(skb, ifmca,
15e47304 4628 NETLINK_CB(cb->skb).portid,
234b27c3
ED		 4629 cb->nlh->nlmsg_seq,
4630 RTM_GETMULTICAST,
4631 NLM_F_MULTI);
053c095a 4632 if (err < 0)
234b27c3
ED		 4633 break;
4634 }
4635 break;
4636 case ANYCAST_ADDR:
4637 /* anycast address */
4638 for (ifaca = idev->ac_list; ifaca;
4639 ifaca = ifaca->aca_next, ip_idx++) {
4640 if (ip_idx < s_ip_idx)
4641 continue;
4642 err = inet6_fill_ifacaddr(skb, ifaca,
15e47304 4643 NETLINK_CB(cb->skb).portid,
234b27c3
ED		 4644 cb->nlh->nlmsg_seq,
4645 RTM_GETANYCAST,
4646 NLM_F_MULTI);
053c095a 4647 if (err < 0)
234b27c3
ED		 4648 break;
4649 }
4650 break;
4651 default:
4652 break;
4653 }
4654 read_unlock_bh(&idev->lock);
4655 *p_ip_idx = ip_idx;
4656 return err;
4657}
4658
1da177e4
LT		 4659static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
4660 enum addr_type_t type)
4661{
234b27c3
ED		 4662 struct net *net = sock_net(skb->sk);
4663 int h, s_h;
1da177e4
LT		 4664 int idx, ip_idx;
4665 int s_idx, s_ip_idx;
1da177e4 4666 struct net_device *dev;
234b27c3
ED		 4667 struct inet6_dev *idev;
4668 struct hlist_head *head;
1ab1457c 4669
234b27c3
ED		 4670 s_h = cb->args[0];
4671 s_idx = idx = cb->args[1];
4672 s_ip_idx = ip_idx = cb->args[2];
5d5619b4 4673
234b27c3 4674 rcu_read_lock();
63998ac2 4675 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ net->dev_base_seq;
234b27c3
ED		 4676 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4677 idx = 0;
4678 head = &net->dev_index_head[h];
b67bfe0d 4679 hlist_for_each_entry_rcu(dev, head, index_hlist) {
234b27c3
ED		 4680 if (idx < s_idx)
4681 goto cont;
4b97efdf 4682 if (h > s_h || idx > s_idx)
234b27c3
ED		 4683 s_ip_idx = 0;
4684 ip_idx = 0;
e21e8467
SH		 4685 idev = __in6_dev_get(dev);
4686 if (!idev)
234b27c3
ED		 4687 goto cont;
4688
4689 if (in6_dump_addrs(idev, skb, cb, type,
7b46a644 4690 s_ip_idx, &ip_idx) < 0)
234b27c3 4691 goto done;
7562f876 4692cont:
234b27c3
ED		 4693 idx++;
4694 }
1da177e4 4695 }
234b27c3
ED		 4696done:
4697 rcu_read_unlock();
4698 cb->args[0] = h;
4699 cb->args[1] = idx;
4700 cb->args[2] = ip_idx;
4701
1da177e4
LT		 4702 return skb->len;
4703}
4704
4705static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
4706{
4707 enum addr_type_t type = UNICAST_ADDR;
b854272b 4708
1da177e4
LT		 4709 return inet6_dump_addr(skb, cb, type);
4710}
4711
4712static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
4713{
4714 enum addr_type_t type = MULTICAST_ADDR;
b854272b 4715
1da177e4
LT		 4716 return inet6_dump_addr(skb, cb, type);
4717}
4718
4719
4720static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
4721{
4722 enum addr_type_t type = ANYCAST_ADDR;
b854272b 4723
1da177e4
LT		 4724 return inet6_dump_addr(skb, cb, type);
4725}
4726
661d2967 4727static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh)
6c223828 4728{
3b1e0a65 4729 struct net *net = sock_net(in_skb->sk);
1b29fc2c
TG		 4730 struct ifaddrmsg *ifm;
4731 struct nlattr *tb[IFA_MAX+1];
caeaba79 4732 struct in6_addr *addr = NULL, *peer;
6c223828
NT		 4733 struct net_device *dev = NULL;
4734 struct inet6_ifaddr *ifa;
4735 struct sk_buff *skb;
6c223828
NT		 4736 int err;
4737
1b29fc2c
TG		 4738 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
4739 if (err < 0)
4740 goto errout;
4741
caeaba79 4742 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer);
63159f29 4743 if (!addr) {
1b29fc2c
TG		 4744 err = -EINVAL;
4745 goto errout;
6c223828 4746 }
6c223828 4747
1b29fc2c 4748 ifm = nlmsg_data(nlh);
6c223828 4749 if (ifm->ifa_index)
6fda7350 4750 dev = __dev_get_by_index(net, ifm->ifa_index);
6c223828 4751
e21e8467
SH		 4752 ifa = ipv6_get_ifaddr(net, addr, dev, 1);
4753 if (!ifa) {
1b29fc2c
TG		 4754 err = -EADDRNOTAVAIL;
4755 goto errout;
4756 }
6c223828 4757
e21e8467
SH		 4758 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
4759 if (!skb) {
6c223828 4760 err = -ENOBUFS;
1b29fc2c 4761 goto errout_ifa;
6c223828
NT		 4762 }
4763
15e47304 4764 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).portid,
6c223828 4765 nlh->nlmsg_seq, RTM_NEWADDR, 0);
26932566
PM		 4766 if (err < 0) {
4767 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4768 WARN_ON(err == -EMSGSIZE);
4769 kfree_skb(skb);
4770 goto errout_ifa;
4771 }
15e47304 4772 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
1b29fc2c 4773errout_ifa:
6c223828 4774 in6_ifa_put(ifa);
1b29fc2c 4775errout:
6c223828 4776 return err;
6c223828
NT		 4777}
4778
1da177e4
LT		 4779static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
4780{
4781 struct sk_buff *skb;
c346dca1 4782 struct net *net = dev_net(ifa->idev->dev);
5d620266 4783 int err = -ENOBUFS;
1da177e4 4784
0ab6803b 4785 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
63159f29 4786 if (!skb)
5d620266
TG		 4787 goto errout;
4788
4789 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
26932566
PM		 4790 if (err < 0) {
4791 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4792 WARN_ON(err == -EMSGSIZE);
4793 kfree_skb(skb);
4794 goto errout;
4795 }
1ce85fe4
PNA		 4796 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
4797 return;
5d620266
TG		 4798errout:
4799 if (err < 0)
6fda7350 4800 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
1da177e4
LT		 4801}
4802
b6f99a21 4803static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
1da177e4
LT		 4804 __s32 *array, int bytes)
4805{
04561c1f
TG		 4806 BUG_ON(bytes < (DEVCONF_MAX * 4));
4807
1da177e4
LT		 4808 memset(array, 0, bytes);
4809 array[DEVCONF_FORWARDING] = cnf->forwarding;
4810 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
4811 array[DEVCONF_MTU6] = cnf->mtu6;
4812 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
4813 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
4814 array[DEVCONF_AUTOCONF] = cnf->autoconf;
4815 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
4816 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
93908d19
TG		 4817 array[DEVCONF_RTR_SOLICIT_INTERVAL] =
4818 jiffies_to_msecs(cnf->rtr_solicit_interval);
4819 array[DEVCONF_RTR_SOLICIT_DELAY] =
4820 jiffies_to_msecs(cnf->rtr_solicit_delay);
1da177e4 4821 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
fc4eba58
HFS		 4822 array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] =
4823 jiffies_to_msecs(cnf->mldv1_unsolicited_report_interval);
4824 array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] =
4825 jiffies_to_msecs(cnf->mldv2_unsolicited_report_interval);
1da177e4
LT		 4826 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
4827 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
4828 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
4829 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
4830 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
1da177e4 4831 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
65f5c7c1 4832 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
8013d1d7 4833 array[DEVCONF_ACCEPT_RA_MIN_HOP_LIMIT] = cnf->accept_ra_min_hop_limit;
c4fd30eb 4834 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
930d6ff2
YH		 4835#ifdef CONFIG_IPV6_ROUTER_PREF
4836 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
93908d19
TG		 4837 array[DEVCONF_RTR_PROBE_INTERVAL] =
4838 jiffies_to_msecs(cnf->rtr_probe_interval);
fa03ef38 4839#ifdef CONFIG_IPV6_ROUTE_INFO
09c884d4
YH		 4840 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
4841#endif
930d6ff2 4842#endif
fbea49e1 4843 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
0bcbc926 4844 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
95c385b4
NH		 4845#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4846 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
7fd2561e 4847 array[DEVCONF_USE_OPTIMISTIC] = cnf->use_optimistic;
95c385b4 4848#endif
7bc570c8
YH		 4849#ifdef CONFIG_IPV6_MROUTE
4850 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
4851#endif
778d80be 4852 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
1b34be74 4853 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
c3faca05 4854 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
5cb04436 4855 array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify;
b800c3b9 4856 array[DEVCONF_SUPPRESS_FRAG_NDISC] = cnf->suppress_frag_ndisc;
d9333196 4857 array[DEVCONF_ACCEPT_RA_FROM_LOCAL] = cnf->accept_ra_from_local;
c2943f14 4858 array[DEVCONF_ACCEPT_RA_MTU] = cnf->accept_ra_mtu;
35103d11 4859 array[DEVCONF_IGNORE_ROUTES_WITH_LINKDOWN] = cnf->ignore_routes_with_linkdown;
3d1bec99 4860 /* we omit DEVCONF_STABLE_SECRET for now */
3985e8a3 4861 array[DEVCONF_USE_OIF_ADDRS_ONLY] = cnf->use_oif_addrs_only;
abbc3043 4862 array[DEVCONF_DROP_UNICAST_IN_L2_MULTICAST] = cnf->drop_unicast_in_l2_multicast;
7a02bf89 4863 array[DEVCONF_DROP_UNSOLICITED_NA] = cnf->drop_unsolicited_na;
6a923934 4864 array[DEVCONF_KEEP_ADDR_ON_DOWN] = cnf->keep_addr_on_down;
1da177e4
LT		 4865}
4866
b382b191
TG		 4867static inline size_t inet6_ifla6_size(void)
4868{
4869 return nla_total_size(4) /* IFLA_INET6_FLAGS */
4870 + nla_total_size(sizeof(struct ifla_cacheinfo))
4871 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
4872 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
f53adae4
DB		 4873 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
4874 + nla_total_size(sizeof(struct in6_addr)); /* IFLA_INET6_TOKEN */
b382b191
TG		 4875}
4876
339bf98f
TG		 4877static inline size_t inet6_if_nlmsg_size(void)
4878{
4879 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
4880 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
4881 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
4882 + nla_total_size(4) /* IFLA_MTU */
4883 + nla_total_size(4) /* IFLA_LINK */
0344338b 4884 + nla_total_size(1) /* IFLA_OPERSTATE */
b382b191 4885 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */
339bf98f 4886}
c5396a31 4887
be281e55 4888static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib,
7d720c3e 4889 int items, int bytes)
7f7d9a6b
HX		 4890{
4891 int i;
4892 int pad = bytes - sizeof(u64) * items;
4893 BUG_ON(pad < 0);
4894
4895 /* Use put_unaligned() because stats may not be aligned for u64. */
4896 put_unaligned(items, &stats[0]);
4897 for (i = 1; i < items; i++)
be281e55 4898 put_unaligned(atomic_long_read(&mib[i]), &stats[i]);
7f7d9a6b
HX		 4899
4900 memset(&stats[items], 0, pad);
4901}
4902
698365fa 4903static inline void __snmp6_fill_stats64(u64 *stats, void __percpu *mib,
a3a77372 4904 int bytes, size_t syncpoff)
4ce3c183 4905{
a3a77372
R		 4906 int i, c;
4907 u64 buff[IPSTATS_MIB_MAX];
4908 int pad = bytes - sizeof(u64) * IPSTATS_MIB_MAX;
4909
4ce3c183
ED		 4910 BUG_ON(pad < 0);
4911
a3a77372
R		 4912 memset(buff, 0, sizeof(buff));
4913 buff[0] = IPSTATS_MIB_MAX;
4ce3c183 4914
a3a77372
R		 4915 for_each_possible_cpu(c) {
4916 for (i = 1; i < IPSTATS_MIB_MAX; i++)
4917 buff[i] += snmp_get_cpu_field64(mib, c, i, syncpoff);
4918 }
4919
4920 memcpy(stats, buff, IPSTATS_MIB_MAX * sizeof(u64));
4921 memset(&stats[IPSTATS_MIB_MAX], 0, pad);
4ce3c183
ED		 4922}
4923
7f7d9a6b
HX		 4924static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
4925 int bytes)
4926{
e21e8467 4927 switch (attrtype) {
7f7d9a6b 4928 case IFLA_INET6_STATS:
a3a77372
R		 4929 __snmp6_fill_stats64(stats, idev->stats.ipv6, bytes,
4930 offsetof(struct ipstats_mib, syncp));
7f7d9a6b
HX		 4931 break;
4932 case IFLA_INET6_ICMP6STATS:
be281e55 4933 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, ICMP6_MIB_MAX, bytes);
7f7d9a6b
HX		 4934 break;
4935 }
4936}
4937
d5566fd7
SV		 4938static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev,
4939 u32 ext_filter_mask)
b382b191
TG		 4940{
4941 struct nlattr *nla;
4942 struct ifla_cacheinfo ci;
4943
c78679e8
DM		 4944 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags))
4945 goto nla_put_failure;
b382b191 4946 ci.max_reasm_len = IPV6_MAXPLEN;
24912420
DM		 4947 ci.tstamp = cstamp_delta(idev->tstamp);
4948 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time);
1f9248e5 4949 ci.retrans_time = jiffies_to_msecs(NEIGH_VAR(idev->nd_parms, RETRANS_TIME));
c78679e8
DM		 4950 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci))
4951 goto nla_put_failure;
b382b191 4952 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
63159f29 4953 if (!nla)
b382b191
TG		 4954 goto nla_put_failure;
4955 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
4956
4957 /* XXX - MC not implemented */
4958
d5566fd7
SV		 4959 if (ext_filter_mask & RTEXT_FILTER_SKIP_STATS)
4960 return 0;
4961
b382b191 4962 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
63159f29 4963 if (!nla)
b382b191
TG		 4964 goto nla_put_failure;
4965 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
4966
4967 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
63159f29 4968 if (!nla)
b382b191
TG		 4969 goto nla_put_failure;
4970 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
4971
f53adae4 4972 nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr));
63159f29 4973 if (!nla)
f53adae4 4974 goto nla_put_failure;
bc91b0f0
JP		 4975
4976 if (nla_put_u8(skb, IFLA_INET6_ADDR_GEN_MODE, idev->addr_gen_mode))
4977 goto nla_put_failure;
4978
f53adae4
DB		 4979 read_lock_bh(&idev->lock);
4980 memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla));
4981 read_unlock_bh(&idev->lock);
4982
b382b191
TG		 4983 return 0;
4984
4985nla_put_failure:
4986 return -EMSGSIZE;
4987}
4988
b1974ed0
AR		 4989static size_t inet6_get_link_af_size(const struct net_device *dev,
4990 u32 ext_filter_mask)
b382b191
TG		 4991{
4992 if (!__in6_dev_get(dev))
4993 return 0;
4994
4995 return inet6_ifla6_size();
4996}
4997
d5566fd7
SV		 4998static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev,
4999 u32 ext_filter_mask)
b382b191
TG		 5000{
5001 struct inet6_dev *idev = __in6_dev_get(dev);
5002
5003 if (!idev)
5004 return -ENODATA;
5005
d5566fd7 5006 if (inet6_fill_ifla6_attrs(skb, idev, ext_filter_mask) < 0)
b382b191
TG		 5007 return -EMSGSIZE;
5008
5009 return 0;
5010}
5011
f53adae4
DB		 5012static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token)
5013{
f53adae4
DB		 5014 struct inet6_ifaddr *ifp;
5015 struct net_device *dev = idev->dev;
fc403832 5016 bool update_rs = false;
dc848292 5017 struct in6_addr ll_addr;
f53adae4 5018
c15b1cca
HFS		 5019 ASSERT_RTNL();
5020
63159f29 5021 if (!token)
f53adae4
DB		 5022 return -EINVAL;
5023 if (ipv6_addr_any(token))
5024 return -EINVAL;
5025 if (dev->flags & (IFF_LOOPBACK | IFF_NOARP))
5026 return -EINVAL;
f53adae4
DB		 5027 if (!ipv6_accept_ra(idev))
5028 return -EINVAL;
5029 if (idev->cnf.rtr_solicits <= 0)
5030 return -EINVAL;
5031
5032 write_lock_bh(&idev->lock);
5033
5034 BUILD_BUG_ON(sizeof(token->s6_addr) != 16);
5035 memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8);
5036
5037 write_unlock_bh(&idev->lock);
5038
dc848292
HFS		 5039 if (!idev->dead && (idev->if_flags & IF_READY) &&
5040 !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE |
5041 IFA_F_OPTIMISTIC)) {
fc403832
DB		 5042
5043 /* If we're not ready, then normal ifup will take care
5044 * of this. Otherwise, we need to request our rs here.
5045 */
5046 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters);
5047 update_rs = true;
5048 }
f53adae4
DB		 5049
5050 write_lock_bh(&idev->lock);
fc403832 5051
77ecaace 5052 if (update_rs) {
fc403832 5053 idev->if_flags |= IF_RS_SENT;
77ecaace
HFS		 5054 idev->rs_probes = 1;
5055 addrconf_mod_rs_timer(idev, idev->cnf.rtr_solicit_interval);
5056 }
f53adae4
DB		 5057
5058 /* Well, that's kinda nasty ... */
5059 list_for_each_entry(ifp, &idev->addr_list, if_list) {
5060 spin_lock(&ifp->lock);
617fe29d 5061 if (ifp->tokenized) {
f53adae4
DB		 5062 ifp->valid_lft = 0;
5063 ifp->prefered_lft = 0;
5064 }
5065 spin_unlock(&ifp->lock);
5066 }
5067
5068 write_unlock_bh(&idev->lock);
b2ed64a9 5069 inet6_ifinfo_notify(RTM_NEWLINK, idev);
c15b1cca 5070 addrconf_verify_rtnl();
f53adae4
DB		 5071 return 0;
5072}
5073
11b1f828
DB		 5074static const struct nla_policy inet6_af_policy[IFLA_INET6_MAX + 1] = {
5075 [IFLA_INET6_ADDR_GEN_MODE] = { .type = NLA_U8 },
5076 [IFLA_INET6_TOKEN] = { .len = sizeof(struct in6_addr) },
5077};
5078
5079static int inet6_validate_link_af(const struct net_device *dev,
5080 const struct nlattr *nla)
5081{
5082 struct nlattr *tb[IFLA_INET6_MAX + 1];
5083
5084 if (dev && !__in6_dev_get(dev))
5085 return -EAFNOSUPPORT;
5086
5087 return nla_parse_nested(tb, IFLA_INET6_MAX, nla, inet6_af_policy);
5088}
5089
f53adae4
DB		 5090static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla)
5091{
5092 int err = -EINVAL;
5093 struct inet6_dev *idev = __in6_dev_get(dev);
5094 struct nlattr *tb[IFLA_INET6_MAX + 1];
5095
5096 if (!idev)
5097 return -EAFNOSUPPORT;
5098
5099 if (nla_parse_nested(tb, IFLA_INET6_MAX, nla, NULL) < 0)
5100 BUG();
5101
bc91b0f0 5102 if (tb[IFLA_INET6_TOKEN]) {
f53adae4 5103 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN]));
bc91b0f0
JP		 5104 if (err)
5105 return err;
5106 }
5107
5108 if (tb[IFLA_INET6_ADDR_GEN_MODE]) {
5109 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]);
5110
5111 if (mode != IN6_ADDR_GEN_MODE_EUI64 &&
622c81d5 5112 mode != IN6_ADDR_GEN_MODE_NONE &&
cc9da6cc
BM		 5113 mode != IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
5114 mode != IN6_ADDR_GEN_MODE_RANDOM)
622c81d5
HFS		 5115 return -EINVAL;
5116
5117 if (mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
5118 !idev->cnf.stable_secret.initialized &&
5119 !dev_net(dev)->ipv6.devconf_dflt->stable_secret.initialized)
bc91b0f0 5120 return -EINVAL;
622c81d5 5121
bc91b0f0
JP		 5122 idev->addr_gen_mode = mode;
5123 err = 0;
5124 }
f53adae4
DB		 5125
5126 return err;
5127}
5128
1ab1457c 5129static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
15e47304 5130 u32 portid, u32 seq, int event, unsigned int flags)
1da177e4 5131{
04561c1f 5132 struct net_device *dev = idev->dev;
04561c1f
TG		 5133 struct ifinfomsg *hdr;
5134 struct nlmsghdr *nlh;
5135 void *protoinfo;
04561c1f 5136
15e47304 5137 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags);
63159f29 5138 if (!nlh)
26932566 5139 return -EMSGSIZE;
04561c1f
TG		 5140
5141 hdr = nlmsg_data(nlh);
5142 hdr->ifi_family = AF_INET6;
5143 hdr->__ifi_pad = 0;
5144 hdr->ifi_type = dev->type;
5145 hdr->ifi_index = dev->ifindex;
5146 hdr->ifi_flags = dev_get_flags(dev);
5147 hdr->ifi_change = 0;
5148
c78679e8
DM		 5149 if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
5150 (dev->addr_len &&
5151 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
5152 nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
a54acb3a 5153 (dev->ifindex != dev_get_iflink(dev) &&
0344338b
AG		 5154 nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))) ||
5155 nla_put_u8(skb, IFLA_OPERSTATE,
5156 netif_running(dev) ? dev->operstate : IF_OPER_DOWN))
c78679e8 5157 goto nla_put_failure;
04561c1f 5158 protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
63159f29 5159 if (!protoinfo)
04561c1f 5160 goto nla_put_failure;
1da177e4 5161
d5566fd7 5162 if (inet6_fill_ifla6_attrs(skb, idev, 0) < 0)
bf99f1bd 5163 goto nla_put_failure;
1da177e4 5164
04561c1f 5165 nla_nest_end(skb, protoinfo);
053c095a
JB		 5166 nlmsg_end(skb, nlh);
5167 return 0;
1da177e4 5168
04561c1f 5169nla_put_failure:
26932566
PM		 5170 nlmsg_cancel(skb, nlh);
5171 return -EMSGSIZE;
1da177e4
LT		 5172}
5173
5174static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
5175{
3b1e0a65 5176 struct net *net = sock_net(skb->sk);
84d2697d 5177 int h, s_h;
434a8a58 5178 int idx = 0, s_idx;
1da177e4
LT		 5179 struct net_device *dev;
5180 struct inet6_dev *idev;
84d2697d 5181 struct hlist_head *head;
1da177e4 5182
84d2697d
ED		 5183 s_h = cb->args[0];
5184 s_idx = cb->args[1];
5185
5186 rcu_read_lock();
5187 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
5188 idx = 0;
5189 head = &net->dev_index_head[h];
b67bfe0d 5190 hlist_for_each_entry_rcu(dev, head, index_hlist) {
84d2697d
ED		 5191 if (idx < s_idx)
5192 goto cont;
5193 idev = __in6_dev_get(dev);
5194 if (!idev)
5195 goto cont;
5196 if (inet6_fill_ifinfo(skb, idev,
15e47304 5197 NETLINK_CB(cb->skb).portid,
84d2697d 5198 cb->nlh->nlmsg_seq,
053c095a 5199 RTM_NEWLINK, NLM_F_MULTI) < 0)
84d2697d 5200 goto out;
7562f876 5201cont:
84d2697d
ED		 5202 idx++;
5203 }
1da177e4 5204 }
84d2697d
ED		 5205out:
5206 rcu_read_unlock();
5207 cb->args[1] = idx;
5208 cb->args[0] = h;
1da177e4
LT		 5209
5210 return skb->len;
5211}
5212
5213void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
5214{
5215 struct sk_buff *skb;
c346dca1 5216 struct net *net = dev_net(idev->dev);
8d7a76c9 5217 int err = -ENOBUFS;
1ab1457c 5218
339bf98f 5219 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
63159f29 5220 if (!skb)
8d7a76c9
TG		 5221 goto errout;
5222
5223 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
26932566
PM		 5224 if (err < 0) {
5225 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
5226 WARN_ON(err == -EMSGSIZE);
5227 kfree_skb(skb);
5228 goto errout;
5229 }
5f75a104 5230 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC);
1ce85fe4 5231 return;
8d7a76c9
TG		 5232errout:
5233 if (err < 0)
5f75a104 5234 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err);
1da177e4
LT		 5235}
5236
339bf98f
TG		 5237static inline size_t inet6_prefix_nlmsg_size(void)
5238{
5239 return NLMSG_ALIGN(sizeof(struct prefixmsg))
5240 + nla_total_size(sizeof(struct in6_addr))
5241 + nla_total_size(sizeof(struct prefix_cacheinfo));
5242}
c5396a31 5243
1da177e4 5244static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
15e47304 5245 struct prefix_info *pinfo, u32 portid, u32 seq,
6051e2f4 5246 int event, unsigned int flags)
1da177e4 5247{
6051e2f4
TG		 5248 struct prefixmsg *pmsg;
5249 struct nlmsghdr *nlh;
1da177e4
LT		 5250 struct prefix_cacheinfo ci;
5251
15e47304 5252 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags);
63159f29 5253 if (!nlh)
26932566 5254 return -EMSGSIZE;
6051e2f4
TG		 5255
5256 pmsg = nlmsg_data(nlh);
1da177e4 5257 pmsg->prefix_family = AF_INET6;
8a47077a
PM		 5258 pmsg->prefix_pad1 = 0;
5259 pmsg->prefix_pad2 = 0;
1da177e4
LT		 5260 pmsg->prefix_ifindex = idev->dev->ifindex;
5261 pmsg->prefix_len = pinfo->prefix_len;
5262 pmsg->prefix_type = pinfo->type;
8a47077a 5263 pmsg->prefix_pad3 = 0;
1da177e4
LT		 5264 pmsg->prefix_flags = 0;
5265 if (pinfo->onlink)
5266 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
5267 if (pinfo->autoconf)
5268 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
5269
c78679e8
DM		 5270 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix))
5271 goto nla_put_failure;
1da177e4
LT		 5272 ci.preferred_time = ntohl(pinfo->prefered);
5273 ci.valid_time = ntohl(pinfo->valid);
c78679e8
DM		 5274 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci))
5275 goto nla_put_failure;
053c095a
JB		 5276 nlmsg_end(skb, nlh);
5277 return 0;
1da177e4 5278
6051e2f4 5279nla_put_failure:
26932566
PM		 5280 nlmsg_cancel(skb, nlh);
5281 return -EMSGSIZE;
1da177e4
LT		 5282}
5283
1ab1457c 5284static void inet6_prefix_notify(int event, struct inet6_dev *idev,
1da177e4
LT		 5285 struct prefix_info *pinfo)
5286{
5287 struct sk_buff *skb;
c346dca1 5288 struct net *net = dev_net(idev->dev);
8c384bfa 5289 int err = -ENOBUFS;
1da177e4 5290
339bf98f 5291 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
63159f29 5292 if (!skb)
8c384bfa
TG		 5293 goto errout;
5294
5295 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
26932566
PM		 5296 if (err < 0) {
5297 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
5298 WARN_ON(err == -EMSGSIZE);
5299 kfree_skb(skb);
5300 goto errout;
5301 }
1ce85fe4
PNA		 5302 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
5303 return;
8c384bfa
TG		 5304errout:
5305 if (err < 0)
6fda7350 5306 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
1da177e4
LT		 5307}
5308
1da177e4
LT		 5309static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
5310{
63998ac2
ND		 5311 struct net *net = dev_net(ifp->idev->dev);
5312
c15b1cca
HFS		 5313 if (event)
5314 ASSERT_RTNL();
5315
1da177e4
LT		 5316 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
5317
5318 switch (event) {
5319 case RTM_NEWADDR:
95c385b4
NH		 5320 /*
5321 * If the address was optimistic
5322 * we inserted the route at the start of
5323 * our DAD process, so we don't need
5324 * to do it again
5325 */
5326 if (!(ifp->rt->rt6i_node))
5327 ip6_ins_rt(ifp->rt);
1da177e4
LT		 5328 if (ifp->idev->cnf.forwarding)
5329 addrconf_join_anycast(ifp);
7996c799 5330 if (!ipv6_addr_any(&ifp->peer_addr))
caeaba79
ND		 5331 addrconf_prefix_route(&ifp->peer_addr, 128,
5332 ifp->idev->dev, 0, 0);
1da177e4
LT		 5333 break;
5334 case RTM_DELADDR:
5335 if (ifp->idev->cnf.forwarding)
5336 addrconf_leave_anycast(ifp);
5337 addrconf_leave_solict(ifp->idev, &ifp->addr);
7996c799 5338 if (!ipv6_addr_any(&ifp->peer_addr)) {
caeaba79 5339 struct rt6_info *rt;
caeaba79 5340
e7478dfc
ND		 5341 rt = addrconf_get_prefix_route(&ifp->peer_addr, 128,
5342 ifp->idev->dev, 0, 0);
8e3d5be7
MKL		 5343 if (rt)
5344 ip6_del_rt(rt);
caeaba79 5345 }
799977d9
DA		 5346 dst_hold(&ifp->rt->dst);
5347
5348 ip6_del_rt(ifp->rt);
705f1c86
HFS		 5349
5350 rt_genid_bump_ipv6(net);
1da177e4
LT		 5351 break;
5352 }
63998ac2 5353 atomic_inc(&net->ipv6.dev_addr_genid);
1da177e4
LT		 5354}
5355
5356static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
5357{
8814c4b5 5358 rcu_read_lock_bh();
1da177e4
LT		 5359 if (likely(ifp->idev->dead == 0))
5360 __ipv6_ifa_notify(event, ifp);
8814c4b5 5361 rcu_read_unlock_bh();
1da177e4
LT		 5362}
5363
5364#ifdef CONFIG_SYSCTL
5365
5366static
fe2c6338 5367int addrconf_sysctl_forward(struct ctl_table *ctl, int write,
1da177e4
LT		 5368 void __user *buffer, size_t *lenp, loff_t *ppos)
5369{
5370 int *valp = ctl->data;
5371 int val = *valp;
88af182e 5372 loff_t pos = *ppos;
fe2c6338 5373 struct ctl_table lctl;
1da177e4
LT		 5374 int ret;
5375
013d97e9
FR		 5376 /*
5377 * ctl->data points to idev->cnf.forwarding, we should
5378 * not modify it until we get the rtnl lock.
5379 */
5380 lctl = *ctl;
5381 lctl.data = &val;
5382
5383 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
1da177e4 5384
c8fecf22 5385 if (write)
b325fddb 5386 ret = addrconf_fixup_forwarding(ctl, valp, val);
88af182e
EB		 5387 if (ret)
5388 *ppos = pos;
1ab1457c 5389 return ret;
1da177e4
LT		 5390}
5391
d6df198d
PS		 5392static
5393int addrconf_sysctl_hop_limit(struct ctl_table *ctl, int write,
5394 void __user *buffer, size_t *lenp, loff_t *ppos)
5395{
5396 struct ctl_table lctl;
5397 int min_hl = 1, max_hl = 255;
5398
5399 lctl = *ctl;
5400 lctl.extra1 = &min_hl;
5401 lctl.extra2 = &max_hl;
5402
5403 return proc_dointvec_minmax(&lctl, write, buffer, lenp, ppos);
5404}
5405
77751427
ML		 5406static
5407int addrconf_sysctl_mtu(struct ctl_table *ctl, int write,
5408 void __user *buffer, size_t *lenp, loff_t *ppos)
5409{
5410 struct inet6_dev *idev = ctl->extra1;
5411 int min_mtu = IPV6_MIN_MTU;
5412 struct ctl_table lctl;
5413
5414 lctl = *ctl;
5415 lctl.extra1 = &min_mtu;
5416 lctl.extra2 = idev ? &idev->dev->mtu : NULL;
5417
5418 return proc_dointvec_minmax(&lctl, write, buffer, lenp, ppos);
5419}
5420
56d417b1
BH		 5421static void dev_disable_change(struct inet6_dev *idev)
5422{
75538c2b
CW		 5423 struct netdev_notifier_info info;
5424
56d417b1
BH		 5425 if (!idev || !idev->dev)
5426 return;
5427
75538c2b 5428 netdev_notifier_info_init(&info, idev->dev);
56d417b1 5429 if (idev->cnf.disable_ipv6)
75538c2b 5430 addrconf_notify(NULL, NETDEV_DOWN, &info);
56d417b1 5431 else
75538c2b 5432 addrconf_notify(NULL, NETDEV_UP, &info);
56d417b1
BH		 5433}
5434
5435static void addrconf_disable_change(struct net *net, __s32 newf)
5436{
5437 struct net_device *dev;
5438 struct inet6_dev *idev;
5439
c6d14c84
ED		 5440 rcu_read_lock();
5441 for_each_netdev_rcu(net, dev) {
56d417b1
BH		 5442 idev = __in6_dev_get(dev);
5443 if (idev) {
5444 int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
5445 idev->cnf.disable_ipv6 = newf;
5446 if (changed)
5447 dev_disable_change(idev);
5448 }
56d417b1 5449 }
c6d14c84 5450 rcu_read_unlock();
56d417b1
BH		 5451}
5452
013d97e9 5453static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf)
56d417b1
BH		 5454{
5455 struct net *net;
013d97e9
FR		 5456 int old;
5457
5458 if (!rtnl_trylock())
5459 return restart_syscall();
56d417b1
BH		 5460
5461 net = (struct net *)table->extra2;
013d97e9
FR		 5462 old = *p;
5463 *p = newf;
56d417b1 5464
013d97e9
FR		 5465 if (p == &net->ipv6.devconf_dflt->disable_ipv6) {
5466 rtnl_unlock();
56d417b1 5467 return 0;
88af182e 5468 }
56d417b1
BH		 5469
5470 if (p == &net->ipv6.devconf_all->disable_ipv6) {
56d417b1
BH		 5471 net->ipv6.devconf_dflt->disable_ipv6 = newf;
5472 addrconf_disable_change(net, newf);
013d97e9 5473 } else if ((!newf) ^ (!old))
56d417b1
BH		 5474 dev_disable_change((struct inet6_dev *)table->extra1);
5475
5476 rtnl_unlock();
5477 return 0;
5478}
5479
5480static
fe2c6338 5481int addrconf_sysctl_disable(struct ctl_table *ctl, int write,
56d417b1
BH		 5482 void __user *buffer, size_t *lenp, loff_t *ppos)
5483{
5484 int *valp = ctl->data;
5485 int val = *valp;
88af182e 5486 loff_t pos = *ppos;
fe2c6338 5487 struct ctl_table lctl;
56d417b1
BH		 5488 int ret;
5489
013d97e9
FR		 5490 /*
5491 * ctl->data points to idev->cnf.disable_ipv6, we should
5492 * not modify it until we get the rtnl lock.
5493 */
5494 lctl = *ctl;
5495 lctl.data = &val;
5496
5497 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
56d417b1
BH		 5498
5499 if (write)
5500 ret = addrconf_disable_ipv6(ctl, valp, val);
88af182e
EB		 5501 if (ret)
5502 *ppos = pos;
56d417b1
BH		 5503 return ret;
5504}
5505
c92d5491 5506static
5507int addrconf_sysctl_proxy_ndp(struct ctl_table *ctl, int write,
5508 void __user *buffer, size_t *lenp, loff_t *ppos)
5509{
5510 int *valp = ctl->data;
5511 int ret;
5512 int old, new;
5513
5514 old = *valp;
5515 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
5516 new = *valp;
5517
5518 if (write && old != new) {
5519 struct net *net = ctl->extra2;
5520
5521 if (!rtnl_trylock())
5522 return restart_syscall();
5523
5524 if (valp == &net->ipv6.devconf_dflt->proxy_ndp)
5525 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
5526 NETCONFA_IFINDEX_DEFAULT,
5527 net->ipv6.devconf_dflt);
5528 else if (valp == &net->ipv6.devconf_all->proxy_ndp)
5529 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
5530 NETCONFA_IFINDEX_ALL,
5531 net->ipv6.devconf_all);
5532 else {
5533 struct inet6_dev *idev = ctl->extra1;
5534
5535 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
5536 idev->dev->ifindex,
5537 &idev->cnf);
5538 }
5539 rtnl_unlock();
5540 }
5541
5542 return ret;
5543}
5544
3d1bec99
HFS		 5545static int addrconf_sysctl_stable_secret(struct ctl_table *ctl, int write,
5546 void __user *buffer, size_t *lenp,
5547 loff_t *ppos)
5548{
5549 int err;
5550 struct in6_addr addr;
5551 char str[IPV6_MAX_STRLEN];
5552 struct ctl_table lctl = *ctl;
622c81d5 5553 struct net *net = ctl->extra2;
3d1bec99
HFS		 5554 struct ipv6_stable_secret *secret = ctl->data;
5555
622c81d5
HFS		 5556 if (&net->ipv6.devconf_all->stable_secret == ctl->data)
5557 return -EIO;
5558
3d1bec99
HFS		 5559 lctl.maxlen = IPV6_MAX_STRLEN;
5560 lctl.data = str;
5561
5562 if (!rtnl_trylock())
5563 return restart_syscall();
5564
5565 if (!write && !secret->initialized) {
5566 err = -EIO;
5567 goto out;
5568 }
5569
5449a5ca
WC		 5570 err = snprintf(str, sizeof(str), "%pI6", &secret->secret);
5571 if (err >= sizeof(str)) {
5572 err = -EIO;
5573 goto out;
3d1bec99
HFS		 5574 }
5575
5576 err = proc_dostring(&lctl, write, buffer, lenp, ppos);
5577 if (err || !write)
5578 goto out;
5579
5580 if (in6_pton(str, -1, addr.in6_u.u6_addr8, -1, NULL) != 1) {
5581 err = -EIO;
5582 goto out;
5583 }
5584
5585 secret->initialized = true;
5586 secret->secret = addr;
5587
622c81d5
HFS		 5588 if (&net->ipv6.devconf_dflt->stable_secret == ctl->data) {
5589 struct net_device *dev;
5590
5591 for_each_netdev(net, dev) {
5592 struct inet6_dev *idev = __in6_dev_get(dev);
5593
5594 if (idev) {
5595 idev->addr_gen_mode =
5596 IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
5597 }
5598 }
5599 } else {
5600 struct inet6_dev *idev = ctl->extra1;
5601
5602 idev->addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
5603 }
5604
3d1bec99
HFS		 5605out:
5606 rtnl_unlock();
5607
5608 return err;
5609}
c92d5491 5610
35103d11
AG		 5611static
5612int addrconf_sysctl_ignore_routes_with_linkdown(struct ctl_table *ctl,
5613 int write,
5614 void __user *buffer,
5615 size_t *lenp,
5616 loff_t *ppos)
5617{
5618 int *valp = ctl->data;
5619 int val = *valp;
5620 loff_t pos = *ppos;
5621 struct ctl_table lctl;
5622 int ret;
5623
5624 /* ctl->data points to idev->cnf.ignore_routes_when_linkdown
5625 * we should not modify it until we get the rtnl lock.
5626 */
5627 lctl = *ctl;
5628 lctl.data = &val;
5629
5630 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
5631
5632 if (write)
5633 ret = addrconf_fixup_linkdown(ctl, valp, val);
5634 if (ret)
5635 *ppos = pos;
5636 return ret;
5637}
5638
1da177e4
LT		 5639static struct addrconf_sysctl_table
5640{
5641 struct ctl_table_header *sysctl_header;
fe2c6338 5642 struct ctl_table addrconf_vars[DEVCONF_MAX+1];
ab32ea5d 5643} addrconf_sysctl __read_mostly = {
1da177e4
LT		 5644 .sysctl_header = NULL,
5645 .addrconf_vars = {
1ab1457c 5646 {
e21e8467
SH		 5647 .procname = "forwarding",
5648 .data = &ipv6_devconf.forwarding,
5649 .maxlen = sizeof(int),
5650 .mode = 0644,
5651 .proc_handler = addrconf_sysctl_forward,
1da177e4
LT		 5652 },
5653 {
e21e8467
SH		 5654 .procname = "hop_limit",
5655 .data = &ipv6_devconf.hop_limit,
5656 .maxlen = sizeof(int),
5657 .mode = 0644,
d6df198d 5658 .proc_handler = addrconf_sysctl_hop_limit,
1da177e4
LT		 5659 },
5660 {
e21e8467
SH		 5661 .procname = "mtu",
5662 .data = &ipv6_devconf.mtu6,
5663 .maxlen = sizeof(int),
5664 .mode = 0644,
77751427 5665 .proc_handler = addrconf_sysctl_mtu,
1da177e4
LT		 5666 },
5667 {
e21e8467
SH		 5668 .procname = "accept_ra",
5669 .data = &ipv6_devconf.accept_ra,
5670 .maxlen = sizeof(int),
5671 .mode = 0644,
5672 .proc_handler = proc_dointvec,
1da177e4
LT		 5673 },
5674 {
e21e8467
SH		 5675 .procname = "accept_redirects",
5676 .data = &ipv6_devconf.accept_redirects,
5677 .maxlen = sizeof(int),
5678 .mode = 0644,
5679 .proc_handler = proc_dointvec,
1da177e4
LT		 5680 },
5681 {
e21e8467
SH		 5682 .procname = "autoconf",
5683 .data = &ipv6_devconf.autoconf,
5684 .maxlen = sizeof(int),
5685 .mode = 0644,
5686 .proc_handler = proc_dointvec,
1da177e4
LT		 5687 },
5688 {
e21e8467
SH		 5689 .procname = "dad_transmits",
5690 .data = &ipv6_devconf.dad_transmits,
5691 .maxlen = sizeof(int),
5692 .mode = 0644,
5693 .proc_handler = proc_dointvec,
1da177e4
LT		 5694 },
5695 {
e21e8467
SH		 5696 .procname = "router_solicitations",
5697 .data = &ipv6_devconf.rtr_solicits,
5698 .maxlen = sizeof(int),
5699 .mode = 0644,
5700 .proc_handler = proc_dointvec,
1da177e4
LT		 5701 },
5702 {
e21e8467
SH		 5703 .procname = "router_solicitation_interval",
5704 .data = &ipv6_devconf.rtr_solicit_interval,
5705 .maxlen = sizeof(int),
5706 .mode = 0644,
5707 .proc_handler = proc_dointvec_jiffies,
1da177e4
LT		 5708 },
5709 {
e21e8467
SH		 5710 .procname = "router_solicitation_delay",
5711 .data = &ipv6_devconf.rtr_solicit_delay,
5712 .maxlen = sizeof(int),
5713 .mode = 0644,
5714 .proc_handler = proc_dointvec_jiffies,
1da177e4
LT		 5715 },
5716 {
e21e8467
SH		 5717 .procname = "force_mld_version",
5718 .data = &ipv6_devconf.force_mld_version,
5719 .maxlen = sizeof(int),
5720 .mode = 0644,
5721 .proc_handler = proc_dointvec,
1da177e4 5722 },
fc4eba58
HFS		 5723 {
5724 .procname = "mldv1_unsolicited_report_interval",
5725 .data =
5726 &ipv6_devconf.mldv1_unsolicited_report_interval,
5727 .maxlen = sizeof(int),
5728 .mode = 0644,
5729 .proc_handler = proc_dointvec_ms_jiffies,
5730 },
5731 {
5732 .procname = "mldv2_unsolicited_report_interval",
5733 .data =
5734 &ipv6_devconf.mldv2_unsolicited_report_interval,
5735 .maxlen = sizeof(int),
5736 .mode = 0644,
5737 .proc_handler = proc_dointvec_ms_jiffies,
5738 },
1da177e4 5739 {
e21e8467
SH		 5740 .procname = "use_tempaddr",
5741 .data = &ipv6_devconf.use_tempaddr,
5742 .maxlen = sizeof(int),
5743 .mode = 0644,
5744 .proc_handler = proc_dointvec,
1da177e4
LT		 5745 },
5746 {
e21e8467
SH		 5747 .procname = "temp_valid_lft",
5748 .data = &ipv6_devconf.temp_valid_lft,
5749 .maxlen = sizeof(int),
5750 .mode = 0644,
5751 .proc_handler = proc_dointvec,
1da177e4
LT		 5752 },
5753 {
e21e8467
SH		 5754 .procname = "temp_prefered_lft",
5755 .data = &ipv6_devconf.temp_prefered_lft,
5756 .maxlen = sizeof(int),
5757 .mode = 0644,
5758 .proc_handler = proc_dointvec,
1da177e4
LT		 5759 },
5760 {
e21e8467
SH		 5761 .procname = "regen_max_retry",
5762 .data = &ipv6_devconf.regen_max_retry,
5763 .maxlen = sizeof(int),
5764 .mode = 0644,
5765 .proc_handler = proc_dointvec,
1da177e4
LT		 5766 },
5767 {
e21e8467
SH		 5768 .procname = "max_desync_factor",
5769 .data = &ipv6_devconf.max_desync_factor,
5770 .maxlen = sizeof(int),
5771 .mode = 0644,
5772 .proc_handler = proc_dointvec,
1da177e4 5773 },
1da177e4 5774 {
e21e8467
SH		 5775 .procname = "max_addresses",
5776 .data = &ipv6_devconf.max_addresses,
5777 .maxlen = sizeof(int),
5778 .mode = 0644,
5779 .proc_handler = proc_dointvec,
1da177e4 5780 },
65f5c7c1 5781 {
e21e8467
SH		 5782 .procname = "accept_ra_defrtr",
5783 .data = &ipv6_devconf.accept_ra_defrtr,
5784 .maxlen = sizeof(int),
5785 .mode = 0644,
5786 .proc_handler = proc_dointvec,
65f5c7c1 5787 },
8013d1d7
HL		 5788 {
5789 .procname = "accept_ra_min_hop_limit",
5790 .data = &ipv6_devconf.accept_ra_min_hop_limit,
5791 .maxlen = sizeof(int),
5792 .mode = 0644,
5793 .proc_handler = proc_dointvec,
5794 },
c4fd30eb 5795 {
e21e8467
SH		 5796 .procname = "accept_ra_pinfo",
5797 .data = &ipv6_devconf.accept_ra_pinfo,
5798 .maxlen = sizeof(int),
5799 .mode = 0644,
5800 .proc_handler = proc_dointvec,
c4fd30eb 5801 },
930d6ff2
YH		 5802#ifdef CONFIG_IPV6_ROUTER_PREF
5803 {
e21e8467
SH		 5804 .procname = "accept_ra_rtr_pref",
5805 .data = &ipv6_devconf.accept_ra_rtr_pref,
5806 .maxlen = sizeof(int),
5807 .mode = 0644,
5808 .proc_handler = proc_dointvec,
930d6ff2 5809 },
52e16356 5810 {
e21e8467
SH		 5811 .procname = "router_probe_interval",
5812 .data = &ipv6_devconf.rtr_probe_interval,
5813 .maxlen = sizeof(int),
5814 .mode = 0644,
5815 .proc_handler = proc_dointvec_jiffies,
52e16356 5816 },
fa03ef38 5817#ifdef CONFIG_IPV6_ROUTE_INFO
09c884d4 5818 {
e21e8467
SH		 5819 .procname = "accept_ra_rt_info_max_plen",
5820 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
5821 .maxlen = sizeof(int),
5822 .mode = 0644,
5823 .proc_handler = proc_dointvec,
09c884d4
YH		 5824 },
5825#endif
930d6ff2 5826#endif
fbea49e1 5827 {
e21e8467
SH		 5828 .procname = "proxy_ndp",
5829 .data = &ipv6_devconf.proxy_ndp,
5830 .maxlen = sizeof(int),
5831 .mode = 0644,
c92d5491 5832 .proc_handler = addrconf_sysctl_proxy_ndp,
fbea49e1 5833 },
0bcbc926 5834 {
e21e8467
SH		 5835 .procname = "accept_source_route",
5836 .data = &ipv6_devconf.accept_source_route,
5837 .maxlen = sizeof(int),
5838 .mode = 0644,
5839 .proc_handler = proc_dointvec,
0bcbc926 5840 },
95c385b4
NH		 5841#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
5842 {
e21e8467
SH		 5843 .procname = "optimistic_dad",
5844 .data = &ipv6_devconf.optimistic_dad,
5845 .maxlen = sizeof(int),
5846 .mode = 0644,
5847 .proc_handler = proc_dointvec,
95c385b4
NH		 5848
5849 },
7fd2561e
EK		 5850 {
5851 .procname = "use_optimistic",
5852 .data = &ipv6_devconf.use_optimistic,
5853 .maxlen = sizeof(int),
5854 .mode = 0644,
5855 .proc_handler = proc_dointvec,
5856
5857 },
7bc570c8
YH		 5858#endif
5859#ifdef CONFIG_IPV6_MROUTE
5860 {
e21e8467
SH		 5861 .procname = "mc_forwarding",
5862 .data = &ipv6_devconf.mc_forwarding,
5863 .maxlen = sizeof(int),
5864 .mode = 0444,
5865 .proc_handler = proc_dointvec,
7bc570c8 5866 },
95c385b4 5867#endif
778d80be 5868 {
e21e8467
SH		 5869 .procname = "disable_ipv6",
5870 .data = &ipv6_devconf.disable_ipv6,
5871 .maxlen = sizeof(int),
5872 .mode = 0644,
5873 .proc_handler = addrconf_sysctl_disable,
778d80be 5874 },
1b34be74 5875 {
e21e8467
SH		 5876 .procname = "accept_dad",
5877 .data = &ipv6_devconf.accept_dad,
5878 .maxlen = sizeof(int),
5879 .mode = 0644,
5880 .proc_handler = proc_dointvec,
1b34be74 5881 },
f7734fdf 5882 {
f7734fdf
OP		 5883 .procname = "force_tllao",
5884 .data = &ipv6_devconf.force_tllao,
5885 .maxlen = sizeof(int),
5886 .mode = 0644,
5887 .proc_handler = proc_dointvec
5888 },
5cb04436
HFS		 5889 {
5890 .procname = "ndisc_notify",
5891 .data = &ipv6_devconf.ndisc_notify,
5892 .maxlen = sizeof(int),
5893 .mode = 0644,
5894 .proc_handler = proc_dointvec
5895 },
b800c3b9
HFS		 5896 {
5897 .procname = "suppress_frag_ndisc",
5898 .data = &ipv6_devconf.suppress_frag_ndisc,
5899 .maxlen = sizeof(int),
5900 .mode = 0644,
5901 .proc_handler = proc_dointvec
5902 },
d9333196
BG		 5903 {
5904 .procname = "accept_ra_from_local",
5905 .data = &ipv6_devconf.accept_ra_from_local,
5906 .maxlen = sizeof(int),
5907 .mode = 0644,
5908 .proc_handler = proc_dointvec,
5909 },
c2943f14
HH		 5910 {
5911 .procname = "accept_ra_mtu",
5912 .data = &ipv6_devconf.accept_ra_mtu,
5913 .maxlen = sizeof(int),
5914 .mode = 0644,
5915 .proc_handler = proc_dointvec,
5916 },
3d1bec99
HFS		 5917 {
5918 .procname = "stable_secret",
5919 .data = &ipv6_devconf.stable_secret,
5920 .maxlen = IPV6_MAX_STRLEN,
5921 .mode = 0600,
5922 .proc_handler = addrconf_sysctl_stable_secret,
5923 },
3985e8a3
EK		 5924 {
5925 .procname = "use_oif_addrs_only",
5926 .data = &ipv6_devconf.use_oif_addrs_only,
5927 .maxlen = sizeof(int),
5928 .mode = 0644,
5929 .proc_handler = proc_dointvec,
35103d11
AG		 5930 },
5931 {
5932 .procname = "ignore_routes_with_linkdown",
5933 .data = &ipv6_devconf.ignore_routes_with_linkdown,
5934 .maxlen = sizeof(int),
5935 .mode = 0644,
5936 .proc_handler = addrconf_sysctl_ignore_routes_with_linkdown,
3985e8a3 5937 },
abbc3043
JB		 5938 {
5939 .procname = "drop_unicast_in_l2_multicast",
5940 .data = &ipv6_devconf.drop_unicast_in_l2_multicast,
5941 .maxlen = sizeof(int),
5942 .mode = 0644,
5943 .proc_handler = proc_dointvec,
5944 },
7a02bf89
JB		 5945 {
5946 .procname = "drop_unsolicited_na",
5947 .data = &ipv6_devconf.drop_unsolicited_na,
5948 .maxlen = sizeof(int),
5949 .mode = 0644,
5950 .proc_handler = proc_dointvec,
5951 },
6a923934
DM		 5952 {
5953 .procname = "keep_addr_on_down",
5954 .data = &ipv6_devconf.keep_addr_on_down,
5955 .maxlen = sizeof(int),
5956 .mode = 0644,
5957 .proc_handler = proc_dointvec,
5958
5959 },
1da177e4 5960 {
f8572d8f 5961 /* sentinel */
1da177e4
LT		 5962 }
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;
1da177e4 5970 struct addrconf_sysctl_table *t;
6105e293 5971 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ];
1dab6222 5972
af879cc7 5973 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
63159f29 5974 if (!t)
f68635e6
PE		 5975 goto out;
5976
bcdd553f 5977 for (i = 0; t->addrconf_vars[i].data; i++) {
e21e8467 5978 t->addrconf_vars[i].data += (char *)p - (char *)&ipv6_devconf;
1da177e4 5979 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
bff16c2f 5980 t->addrconf_vars[i].extra2 = net;
1da177e4 5981 }
1da177e4 5982
6105e293 5983 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name);
1da177e4 5984
6105e293 5985 t->sysctl_header = register_net_sysctl(net, path, t->addrconf_vars);
63159f29 5986 if (!t->sysctl_header)
6105e293 5987 goto free;
f68635e6
PE		 5988
5989 p->sysctl = t;
95897312 5990 return 0;
1da177e4 5991
f68635e6 5992free:
1da177e4 5993 kfree(t);
f68635e6 5994out:
95897312 5995 return -ENOBUFS;
1da177e4
LT		 5996}
5997
408c4768
PE		 5998static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
5999{
6000 struct addrconf_sysctl_table *t;
6001
63159f29 6002 if (!p->sysctl)
408c4768
PE		 6003 return;
6004
6005 t = p->sysctl;
6006 p->sysctl = NULL;
ff538818 6007 unregister_net_sysctl_table(t->sysctl_header);
408c4768
PE		 6008 kfree(t);
6009}
6010
a317a2f1 6011static int addrconf_sysctl_register(struct inet6_dev *idev)
f52295a9 6012{
a317a2f1
WC		 6013 int err;
6014
6015 if (!sysctl_dev_name_is_allowed(idev->dev->name))
6016 return -EINVAL;
6017
6018 err = neigh_sysctl_register(idev->dev, idev->nd_parms,
6019 &ndisc_ifinfo_sysctl_change);
6020 if (err)
6021 return err;
6022 err = __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
6023 idev, &idev->cnf);
6024 if (err)
6025 neigh_sysctl_unregister(idev->nd_parms);
6026
6027 return err;
f52295a9
PE		 6028}
6029
408c4768 6030static void addrconf_sysctl_unregister(struct inet6_dev *idev)
1da177e4 6031{
408c4768
PE		 6032 __addrconf_sysctl_unregister(&idev->cnf);
6033 neigh_sysctl_unregister(idev->nd_parms);
1da177e4
LT		 6034}
6035
6036
6037#endif
6038
2c8c1e72 6039static int __net_init addrconf_init_net(struct net *net)
e0da5a48 6040{
a79ca223 6041 int err = -ENOMEM;
e0da5a48
PE		 6042 struct ipv6_devconf *all, *dflt;
6043
a79ca223 6044 all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL);
63159f29 6045 if (!all)
a79ca223 6046 goto err_alloc_all;
e0da5a48 6047
a79ca223 6048 dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
63159f29 6049 if (!dflt)
a79ca223 6050 goto err_alloc_dflt;
e0da5a48 6051
a79ca223
HZ		 6052 /* these will be inherited by all namespaces */
6053 dflt->autoconf = ipv6_defaults.autoconf;
6054 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
e0da5a48 6055
3d1bec99
HFS		 6056 dflt->stable_secret.initialized = false;
6057 all->stable_secret.initialized = false;
6058
e0da5a48
PE		 6059 net->ipv6.devconf_all = all;
6060 net->ipv6.devconf_dflt = dflt;
6061
6062#ifdef CONFIG_SYSCTL
f8572d8f 6063 err = __addrconf_sysctl_register(net, "all", NULL, all);
e0da5a48
PE		 6064 if (err < 0)
6065 goto err_reg_all;
6066
f8572d8f 6067 err = __addrconf_sysctl_register(net, "default", NULL, dflt);
e0da5a48
PE		 6068 if (err < 0)
6069 goto err_reg_dflt;
6070#endif
6071 return 0;
6072
6073#ifdef CONFIG_SYSCTL
6074err_reg_dflt:
6075 __addrconf_sysctl_unregister(all);
6076err_reg_all:
6077 kfree(dflt);
6078#endif
6079err_alloc_dflt:
6080 kfree(all);
6081err_alloc_all:
6082 return err;
6083}
6084
2c8c1e72 6085static void __net_exit addrconf_exit_net(struct net *net)
e0da5a48
PE		 6086{
6087#ifdef CONFIG_SYSCTL
6088 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
6089 __addrconf_sysctl_unregister(net->ipv6.devconf_all);
6090#endif
73cf0e92 6091 kfree(net->ipv6.devconf_dflt);
6092 kfree(net->ipv6.devconf_all);
e0da5a48
PE		 6093}
6094
6095static struct pernet_operations addrconf_ops = {
6096 .init = addrconf_init_net,
6097 .exit = addrconf_exit_net,
6098};
6099
207895fd 6100static struct rtnl_af_ops inet6_ops __read_mostly = {
b382b191
TG		 6101 .family = AF_INET6,
6102 .fill_link_af = inet6_fill_link_af,
6103 .get_link_af_size = inet6_get_link_af_size,
11b1f828 6104 .validate_link_af = inet6_validate_link_af,
f53adae4 6105 .set_link_af = inet6_set_link_af,
b382b191
TG		 6106};
6107
1da177e4
LT		 6108/*
6109 * Init / cleanup code
6110 */
6111
6112int __init addrconf_init(void)
6113{
a317a2f1 6114 struct inet6_dev *idev;
c2e21293 6115 int i, err;
2a8cc6c8 6116
e21e8467
SH		 6117 err = ipv6_addr_label_init();
6118 if (err < 0) {
f3213831
JP		 6119 pr_crit("%s: cannot initialize default policy table: %d\n",
6120 __func__, err);
2cc6d2bf 6121 goto out;
2a8cc6c8 6122 }
1da177e4 6123
2cc6d2bf
NH		 6124 err = register_pernet_subsys(&addrconf_ops);
6125 if (err < 0)
6126 goto out_addrlabel;
e0da5a48 6127
c15b1cca
HFS		 6128 addrconf_wq = create_workqueue("ipv6_addrconf");
6129 if (!addrconf_wq) {
6130 err = -ENOMEM;
6131 goto out_nowq;
6132 }
6133
1da177e4
LT		 6134 /* The addrconf netdev notifier requires that loopback_dev
6135 * has it's ipv6 private information allocated and setup
6136 * before it can bring up and give link-local addresses
6137 * to other devices which are up.
6138 *
6139 * Unfortunately, loopback_dev is not necessarily the first
6140 * entry in the global dev_base list of net devices. In fact,
6141 * it is likely to be the very last entry on that list.
6142 * So this causes the notifier registry below to try and
6143 * give link-local addresses to all devices besides loopback_dev
6144 * first, then loopback_dev, which cases all the non-loopback_dev
6145 * devices to fail to get a link-local address.
6146 *
6147 * So, as a temporary fix, allocate the ipv6 structure for
6148 * loopback_dev first by hand.
6149 * Longer term, all of the dependencies ipv6 has upon the loopback
6150 * device and it being up should be removed.
6151 */
6152 rtnl_lock();
a317a2f1 6153 idev = ipv6_add_dev(init_net.loopback_dev);
1da177e4 6154 rtnl_unlock();
a317a2f1
WC		 6155 if (IS_ERR(idev)) {
6156 err = PTR_ERR(idev);
e0da5a48 6157 goto errlo;
a317a2f1 6158 }
1da177e4 6159
c2e21293 6160 for (i = 0; i < IN6_ADDR_HSIZE; i++)
6161 INIT_HLIST_HEAD(&inet6_addr_lst[i]);
6162
1da177e4
LT		 6163 register_netdevice_notifier(&ipv6_dev_notf);
6164
c15b1cca 6165 addrconf_verify();
c127ea2c 6166
3678a9d8 6167 rtnl_af_register(&inet6_ops);
b382b191 6168
c7ac8679
GR		 6169 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo,
6170 NULL);
c127ea2c
TG		 6171 if (err < 0)
6172 goto errout;
6173
6174 /* Only the first call to __rtnl_register can fail */
c7ac8679
GR		 6175 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL, NULL);
6176 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL, NULL);
6177 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr,
6178 inet6_dump_ifaddr, NULL);
6179 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL,
6180 inet6_dump_ifmcaddr, NULL);
6181 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL,
6182 inet6_dump_ifacaddr, NULL);
76f8f6cb 6183 __rtnl_register(PF_INET6, RTM_GETNETCONF, inet6_netconf_get_devconf,
7a674200 6184 inet6_netconf_dump_devconf, NULL);
c127ea2c 6185
2a8cc6c8
YH		 6186 ipv6_addr_label_rtnl_register();
6187
1da177e4 6188 return 0;
c127ea2c 6189errout:
b382b191 6190 rtnl_af_unregister(&inet6_ops);
c127ea2c 6191 unregister_netdevice_notifier(&ipv6_dev_notf);
e0da5a48 6192errlo:
c15b1cca
HFS		 6193 destroy_workqueue(addrconf_wq);
6194out_nowq:
e0da5a48 6195 unregister_pernet_subsys(&addrconf_ops);
2cc6d2bf
NH		 6196out_addrlabel:
6197 ipv6_addr_label_cleanup();
6198out:
c127ea2c 6199 return err;
1da177e4
LT		 6200}
6201
09f7709f 6202void addrconf_cleanup(void)
1da177e4 6203{
176c39af 6204 struct net_device *dev;
1da177e4
LT		 6205 int i;
6206
6207 unregister_netdevice_notifier(&ipv6_dev_notf);
e0da5a48 6208 unregister_pernet_subsys(&addrconf_ops);
2cc6d2bf 6209 ipv6_addr_label_cleanup();
1da177e4
LT		 6210
6211 rtnl_lock();
6212
b382b191
TG		 6213 __rtnl_af_unregister(&inet6_ops);
6214
176c39af
DL		 6215 /* clean dev list */
6216 for_each_netdev(&init_net, dev) {
6217 if (__in6_dev_get(dev) == NULL)
6218 continue;
6219 addrconf_ifdown(dev, 1);
6220 }
6221 addrconf_ifdown(init_net.loopback_dev, 2);
6222
1da177e4
LT		 6223 /*
6224 * Check hash table.
6225 */
5c578aed 6226 spin_lock_bh(&addrconf_hash_lock);
c2e21293 6227 for (i = 0; i < IN6_ADDR_HSIZE; i++)
6228 WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
5c578aed 6229 spin_unlock_bh(&addrconf_hash_lock);
c15b1cca 6230 cancel_delayed_work(&addr_chk_work);
1da177e4 6231 rtnl_unlock();
c15b1cca
HFS		 6232
6233 destroy_workqueue(addrconf_wq);
1da177e4 6234}
Linux kernel - Deliverables
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