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ndisc: add __ndisc_fill_addr_option function
[mirror_ubuntu-bionic-kernel.git] / net / ipv6 / addrconf.c
CommitLineData
1da177e4
LT		 1/*
2 * IPv6 Address [auto]configuration
3 * Linux INET6 implementation
4 *
5 * Authors:
1ab1457c 6 * Pedro Roque <roque@di.fc.ul.pt>
1da177e4
LT		 7 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
8 *
1da177e4
LT		 9 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License
11 * as published by the Free Software Foundation; either version
12 * 2 of the License, or (at your option) any later version.
13 */
14
15/*
16 * Changes:
17 *
18 * Janos Farkas : delete timer on ifdown
19 * <chexum@bankinf.banki.hu>
20 * Andi Kleen : kill double kfree on module
21 * unload.
22 * Maciej W. Rozycki : FDDI support
23 * sekiya@USAGI : Don't send too many RS
24 * packets.
25 * yoshfuji@USAGI : Fixed interval between DAD
26 * packets.
27 * YOSHIFUJI Hideaki @USAGI : improved accuracy of
28 * address validation timer.
29 * YOSHIFUJI Hideaki @USAGI : Privacy Extensions (RFC3041)
30 * support.
31 * Yuji SEKIYA @USAGI : Don't assign a same IPv6
32 * address on a same interface.
33 * YOSHIFUJI Hideaki @USAGI : ARCnet support
34 * YOSHIFUJI Hideaki @USAGI : convert /proc/net/if_inet6 to
35 * seq_file.
b1cacb68
YH		 36 * YOSHIFUJI Hideaki @USAGI : improved source address
37 * selection; consider scope,
38 * status etc.
1da177e4
LT		 39 */
40
f3213831
JP		 41#define pr_fmt(fmt) "IPv6: " fmt
42
1da177e4
LT		 43#include <linux/errno.h>
44#include <linux/types.h>
a0bffffc 45#include <linux/kernel.h>
1da177e4
LT		 46#include <linux/socket.h>
47#include <linux/sockios.h>
1da177e4 48#include <linux/net.h>
3d1bec99 49#include <linux/inet.h>
1da177e4
LT		 50#include <linux/in6.h>
51#include <linux/netdevice.h>
1823730f 52#include <linux/if_addr.h>
1da177e4
LT		 53#include <linux/if_arp.h>
54#include <linux/if_arcnet.h>
55#include <linux/if_infiniband.h>
56#include <linux/route.h>
57#include <linux/inetdevice.h>
58#include <linux/init.h>
5a0e3ad6 59#include <linux/slab.h>
1da177e4
LT		 60#ifdef CONFIG_SYSCTL
61#include <linux/sysctl.h>
62#endif
4fc268d2 63#include <linux/capability.h>
1da177e4
LT		 64#include <linux/delay.h>
65#include <linux/notifier.h>
543537bd 66#include <linux/string.h>
ddbe5032 67#include <linux/hash.h>
1da177e4 68
457c4cbc 69#include <net/net_namespace.h>
1da177e4
LT		 70#include <net/sock.h>
71#include <net/snmp.h>
72
5241c2d7 73#include <net/6lowpan.h>
cb6bf355 74#include <net/firewire.h>
1da177e4
LT		 75#include <net/ipv6.h>
76#include <net/protocol.h>
77#include <net/ndisc.h>
78#include <net/ip6_route.h>
79#include <net/addrconf.h>
80#include <net/tcp.h>
81#include <net/ip.h>
5d620266 82#include <net/netlink.h>
f24e3d65 83#include <net/pkt_sched.h>
ca254490 84#include <net/l3mdev.h>
1da177e4
LT		 85#include <linux/if_tunnel.h>
86#include <linux/rtnetlink.h>
f3a1bfb1 87#include <linux/netconf.h>
1da177e4 88#include <linux/random.h>
e21e8467 89#include <linux/uaccess.h>
7f7d9a6b 90#include <asm/unaligned.h>
1da177e4
LT		 91
92#include <linux/proc_fs.h>
93#include <linux/seq_file.h>
bc3b2d7f 94#include <linux/export.h>
1da177e4
LT		 95
96/* Set to 3 to get tracing... */
97#define ACONF_DEBUG 2
98
99#if ACONF_DEBUG >= 3
ba3542e1 100#define ADBG(fmt, ...) printk(fmt, ##__VA_ARGS__)
1da177e4 101#else
ba3542e1 102#define ADBG(fmt, ...) do { if (0) printk(fmt, ##__VA_ARGS__); } while (0)
1da177e4
LT		 103#endif
104
105#define INFINITY_LIFE_TIME 0xFFFFFFFF
18a31e1e 106
3d1bec99
HFS		 107#define IPV6_MAX_STRLEN \
108 sizeof("ffff:ffff:ffff:ffff:ffff:ffff:255.255.255.255")
109
18a31e1e
TG		 110static inline u32 cstamp_delta(unsigned long cstamp)
111{
112 return (cstamp - INITIAL_JIFFIES) * 100UL / HZ;
113}
1da177e4
LT		 114
115#ifdef CONFIG_SYSCTL
a317a2f1 116static int addrconf_sysctl_register(struct inet6_dev *idev);
408c4768
PE		 117static void addrconf_sysctl_unregister(struct inet6_dev *idev);
118#else
a317a2f1 119static inline int addrconf_sysctl_register(struct inet6_dev *idev)
408c4768 120{
a317a2f1 121 return 0;
408c4768
PE		 122}
123
124static inline void addrconf_sysctl_unregister(struct inet6_dev *idev)
125{
126}
1da177e4
LT		 127#endif
128
eb7e0575
SD		 129static void __ipv6_regen_rndid(struct inet6_dev *idev);
130static void __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
1da177e4 131static void ipv6_regen_rndid(unsigned long data);
1da177e4 132
1b34be74 133static int ipv6_generate_eui64(u8 *eui, struct net_device *dev);
1da177e4 134static int ipv6_count_addresses(struct inet6_dev *idev);
622c81d5
HFS		 135static int ipv6_generate_stable_address(struct in6_addr *addr,
136 u8 dad_count,
137 const struct inet6_dev *idev);
1da177e4
LT		 138
139/*
140 * Configured unicast address hash table
141 */
c2e21293 142static struct hlist_head inet6_addr_lst[IN6_ADDR_HSIZE];
5c578aed 143static DEFINE_SPINLOCK(addrconf_hash_lock);
1da177e4 144
c15b1cca
HFS		 145static void addrconf_verify(void);
146static void addrconf_verify_rtnl(void);
147static void addrconf_verify_work(struct work_struct *);
1da177e4 148
c15b1cca
HFS		 149static struct workqueue_struct *addrconf_wq;
150static DECLARE_DELAYED_WORK(addr_chk_work, addrconf_verify_work);
1da177e4
LT		 151
152static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
153static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
154
93d9b7d7
JP		 155static void addrconf_type_change(struct net_device *dev,
156 unsigned long event);
1da177e4
LT		 157static int addrconf_ifdown(struct net_device *dev, int how);
158
21caa662
RK		 159static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
160 int plen,
161 const struct net_device *dev,
162 u32 flags, u32 noflags);
163
cf22f9a2 164static void addrconf_dad_start(struct inet6_ifaddr *ifp);
c15b1cca 165static void addrconf_dad_work(struct work_struct *w);
1da177e4 166static void addrconf_dad_completed(struct inet6_ifaddr *ifp);
c5e33bdd 167static void addrconf_dad_run(struct inet6_dev *idev);
1da177e4
LT		 168static void addrconf_rs_timer(unsigned long data);
169static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
170static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
171
1ab1457c 172static void inet6_prefix_notify(int event, struct inet6_dev *idev,
1da177e4 173 struct prefix_info *pinfo);
3e81c6da
DM		 174static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
175 struct net_device *dev);
1da177e4 176
888c848e 177static struct ipv6_devconf ipv6_devconf __read_mostly = {
1da177e4
LT		 178 .forwarding = 0,
179 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
180 .mtu6 = IPV6_MIN_MTU,
181 .accept_ra = 1,
182 .accept_redirects = 1,
183 .autoconf = 1,
184 .force_mld_version = 0,
fc4eba58
HFS		 185 .mldv1_unsolicited_report_interval = 10 * HZ,
186 .mldv2_unsolicited_report_interval = HZ,
1da177e4
LT		 187 .dad_transmits = 1,
188 .rtr_solicits = MAX_RTR_SOLICITATIONS,
189 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
190 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
67ba4152 191 .use_tempaddr = 0,
1da177e4
LT		 192 .temp_valid_lft = TEMP_VALID_LIFETIME,
193 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
194 .regen_max_retry = REGEN_MAX_RETRY,
195 .max_desync_factor = MAX_DESYNC_FACTOR,
1da177e4 196 .max_addresses = IPV6_MAX_ADDRESSES,
65f5c7c1 197 .accept_ra_defrtr = 1,
d9333196 198 .accept_ra_from_local = 0,
8013d1d7 199 .accept_ra_min_hop_limit= 1,
c4fd30eb 200 .accept_ra_pinfo = 1,
930d6ff2
YH		 201#ifdef CONFIG_IPV6_ROUTER_PREF
202 .accept_ra_rtr_pref = 1,
52e16356 203 .rtr_probe_interval = 60 * HZ,
09c884d4
YH		 204#ifdef CONFIG_IPV6_ROUTE_INFO
205 .accept_ra_rt_info_max_plen = 0,
206#endif
930d6ff2 207#endif
fbea49e1 208 .proxy_ndp = 0,
0bcbc926 209 .accept_source_route = 0, /* we do not accept RH0 by default. */
778d80be 210 .disable_ipv6 = 0,
1b34be74 211 .accept_dad = 1,
b800c3b9 212 .suppress_frag_ndisc = 1,
c2943f14 213 .accept_ra_mtu = 1,
3d1bec99
HFS		 214 .stable_secret = {
215 .initialized = false,
3985e8a3
EK		 216 },
217 .use_oif_addrs_only = 0,
35103d11 218 .ignore_routes_with_linkdown = 0,
f1705ec1 219 .keep_addr_on_down = 0,
1da177e4
LT		 220};
221
ab32ea5d 222static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
1da177e4
LT		 223 .forwarding = 0,
224 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
225 .mtu6 = IPV6_MIN_MTU,
226 .accept_ra = 1,
227 .accept_redirects = 1,
228 .autoconf = 1,
fc4eba58
HFS		 229 .force_mld_version = 0,
230 .mldv1_unsolicited_report_interval = 10 * HZ,
231 .mldv2_unsolicited_report_interval = HZ,
1da177e4
LT		 232 .dad_transmits = 1,
233 .rtr_solicits = MAX_RTR_SOLICITATIONS,
234 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
235 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
1da177e4
LT		 236 .use_tempaddr = 0,
237 .temp_valid_lft = TEMP_VALID_LIFETIME,
238 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
239 .regen_max_retry = REGEN_MAX_RETRY,
240 .max_desync_factor = MAX_DESYNC_FACTOR,
1da177e4 241 .max_addresses = IPV6_MAX_ADDRESSES,
65f5c7c1 242 .accept_ra_defrtr = 1,
d9333196 243 .accept_ra_from_local = 0,
8013d1d7 244 .accept_ra_min_hop_limit= 1,
c4fd30eb 245 .accept_ra_pinfo = 1,
930d6ff2
YH		 246#ifdef CONFIG_IPV6_ROUTER_PREF
247 .accept_ra_rtr_pref = 1,
52e16356 248 .rtr_probe_interval = 60 * HZ,
09c884d4
YH		 249#ifdef CONFIG_IPV6_ROUTE_INFO
250 .accept_ra_rt_info_max_plen = 0,
251#endif
930d6ff2 252#endif
fbea49e1 253 .proxy_ndp = 0,
0bcbc926 254 .accept_source_route = 0, /* we do not accept RH0 by default. */
778d80be 255 .disable_ipv6 = 0,
1b34be74 256 .accept_dad = 1,
b800c3b9 257 .suppress_frag_ndisc = 1,
c2943f14 258 .accept_ra_mtu = 1,
3d1bec99
HFS		 259 .stable_secret = {
260 .initialized = false,
261 },
3985e8a3 262 .use_oif_addrs_only = 0,
35103d11 263 .ignore_routes_with_linkdown = 0,
f1705ec1 264 .keep_addr_on_down = 0,
1da177e4
LT		 265};
266
f24e3d65 267/* Check if a valid qdisc is available */
05297949 268static inline bool addrconf_qdisc_ok(const struct net_device *dev)
f24e3d65 269{
05297949 270 return !qdisc_tx_is_noop(dev);
f24e3d65
MC		 271}
272
b7b1bfce 273static void addrconf_del_rs_timer(struct inet6_dev *idev)
1da177e4 274{
b7b1bfce
HFS		 275 if (del_timer(&idev->rs_timer))
276 __in6_dev_put(idev);
277}
278
c15b1cca 279static void addrconf_del_dad_work(struct inet6_ifaddr *ifp)
b7b1bfce 280{
c15b1cca 281 if (cancel_delayed_work(&ifp->dad_work))
1da177e4
LT		 282 __in6_ifa_put(ifp);
283}
284
b7b1bfce
HFS		 285static void addrconf_mod_rs_timer(struct inet6_dev *idev,
286 unsigned long when)
287{
288 if (!timer_pending(&idev->rs_timer))
289 in6_dev_hold(idev);
290 mod_timer(&idev->rs_timer, jiffies + when);
291}
1da177e4 292
c15b1cca
HFS		 293static void addrconf_mod_dad_work(struct inet6_ifaddr *ifp,
294 unsigned long delay)
1da177e4 295{
c15b1cca 296 if (!delayed_work_pending(&ifp->dad_work))
1da177e4 297 in6_ifa_hold(ifp);
c15b1cca 298 mod_delayed_work(addrconf_wq, &ifp->dad_work, delay);
1da177e4
LT		 299}
300
7f7d9a6b
HX		 301static int snmp6_alloc_dev(struct inet6_dev *idev)
302{
827da44c
JS		 303 int i;
304
698365fa
WC		 305 idev->stats.ipv6 = alloc_percpu(struct ipstats_mib);
306 if (!idev->stats.ipv6)
7f7d9a6b 307 goto err_ip;
827da44c
JS		 308
309 for_each_possible_cpu(i) {
310 struct ipstats_mib *addrconf_stats;
698365fa 311 addrconf_stats = per_cpu_ptr(idev->stats.ipv6, i);
827da44c 312 u64_stats_init(&addrconf_stats->syncp);
827da44c
JS		 313 }
314
315
be281e55
ED		 316 idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device),
317 GFP_KERNEL);
318 if (!idev->stats.icmpv6dev)
7f7d9a6b 319 goto err_icmp;
be281e55
ED		 320 idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device),
321 GFP_KERNEL);
322 if (!idev->stats.icmpv6msgdev)
14878f75 323 goto err_icmpmsg;
7f7d9a6b
HX		 324
325 return 0;
326
14878f75 327err_icmpmsg:
be281e55 328 kfree(idev->stats.icmpv6dev);
7f7d9a6b 329err_icmp:
698365fa 330 free_percpu(idev->stats.ipv6);
7f7d9a6b 331err_ip:
aaf70ec7 332 return -ENOMEM;
7f7d9a6b
HX		 333}
334
8e5e8f30 335static struct inet6_dev *ipv6_add_dev(struct net_device *dev)
1da177e4
LT		 336{
337 struct inet6_dev *ndev;
a317a2f1 338 int err = -ENOMEM;
1da177e4
LT		 339
340 ASSERT_RTNL();
341
342 if (dev->mtu < IPV6_MIN_MTU)
a317a2f1 343 return ERR_PTR(-EINVAL);
1da177e4 344
1ab1457c 345 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
63159f29 346 if (!ndev)
a317a2f1 347 return ERR_PTR(err);
322f74a4
IO		 348
349 rwlock_init(&ndev->lock);
350 ndev->dev = dev;
502a2ffd 351 INIT_LIST_HEAD(&ndev->addr_list);
b7b1bfce
HFS		 352 setup_timer(&ndev->rs_timer, addrconf_rs_timer,
353 (unsigned long)ndev);
c346dca1 354 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf));
9b29c696
HFS		 355
356 if (ndev->cnf.stable_secret.initialized)
357 ndev->addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
358 else
359 ndev->addr_gen_mode = IN6_ADDR_GEN_MODE_EUI64;
360
322f74a4 361 ndev->cnf.mtu6 = dev->mtu;
322f74a4 362 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
63159f29 363 if (!ndev->nd_parms) {
322f74a4 364 kfree(ndev);
a317a2f1 365 return ERR_PTR(err);
322f74a4 366 }
0187bdfb
BH		 367 if (ndev->cnf.forwarding)
368 dev_disable_lro(dev);
322f74a4
IO		 369 /* We refer to the device */
370 dev_hold(dev);
1da177e4 371
322f74a4 372 if (snmp6_alloc_dev(ndev) < 0) {
ba3542e1 373 ADBG(KERN_WARNING
f3213831 374 "%s: cannot allocate memory for statistics; dev=%s.\n",
ba3542e1 375 __func__, dev->name);
322f74a4 376 neigh_parms_release(&nd_tbl, ndev->nd_parms);
8603e33d
RL		 377 dev_put(dev);
378 kfree(ndev);
a317a2f1 379 return ERR_PTR(err);
322f74a4 380 }
1da177e4 381
322f74a4 382 if (snmp6_register_dev(ndev) < 0) {
ba3542e1 383 ADBG(KERN_WARNING
f3213831 384 "%s: cannot create /proc/net/dev_snmp6/%s\n",
ba3542e1 385 __func__, dev->name);
a317a2f1 386 goto err_release;
322f74a4
IO		 387 }
388
389 /* One reference from device. We must do this before
390 * we invoke __ipv6_regen_rndid().
391 */
392 in6_dev_hold(ndev);
1da177e4 393
1b34be74
YH		 394 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
395 ndev->cnf.accept_dad = -1;
396
07a93626 397#if IS_ENABLED(CONFIG_IPV6_SIT)
b077d7ab 398 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
f3213831 399 pr_info("%s: Disabled Multicast RS\n", dev->name);
b077d7ab
YH		 400 ndev->cnf.rtr_solicits = 0;
401 }
402#endif
403
372e6c8f 404 INIT_LIST_HEAD(&ndev->tempaddr_list);
b24b8a24 405 setup_timer(&ndev->regen_timer, ipv6_regen_rndid, (unsigned long)ndev);
322f74a4
IO		 406 if ((dev->flags&IFF_LOOPBACK) ||
407 dev->type == ARPHRD_TUNNEL ||
9625ed72 408 dev->type == ARPHRD_TUNNEL6 ||
0be669bb 409 dev->type == ARPHRD_SIT ||
0be669bb 410 dev->type == ARPHRD_NONE) {
322f74a4
IO		 411 ndev->cnf.use_tempaddr = -1;
412 } else {
413 in6_dev_hold(ndev);
414 ipv6_regen_rndid((unsigned long) ndev);
415 }
5d9efa7e 416
914faa14 417 ndev->token = in6addr_any;
1da177e4 418
f24e3d65 419 if (netif_running(dev) && addrconf_qdisc_ok(dev))
53aadcc9
HX		 420 ndev->if_flags |= IF_READY;
421
322f74a4
IO		 422 ipv6_mc_init_dev(ndev);
423 ndev->tstamp = jiffies;
a317a2f1
WC		 424 err = addrconf_sysctl_register(ndev);
425 if (err) {
426 ipv6_mc_destroy_dev(ndev);
427 del_timer(&ndev->regen_timer);
2a189f9e 428 snmp6_unregister_dev(ndev);
a317a2f1
WC		 429 goto err_release;
430 }
30c4cf57 431 /* protected by rtnl_lock */
cf778b00 432 rcu_assign_pointer(dev->ip6_ptr, ndev);
d88ae4cc 433
2c5e8933
HFS		 434 /* Join interface-local all-node multicast group */
435 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allnodes);
436
d88ae4cc 437 /* Join all-node multicast group */
f3ee4010 438 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);
d88ae4cc 439
d6ddef9e 440 /* Join all-router multicast group if forwarding is set */
8b2aaede 441 if (ndev->cnf.forwarding && (dev->flags & IFF_MULTICAST))
d6ddef9e
LW		 442 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
443
1da177e4 444 return ndev;
a317a2f1
WC		 445
446err_release:
447 neigh_parms_release(&nd_tbl, ndev->nd_parms);
448 ndev->dead = 1;
449 in6_dev_finish_destroy(ndev);
450 return ERR_PTR(err);
1da177e4
LT		 451}
452
8e5e8f30 453static struct inet6_dev *ipv6_find_idev(struct net_device *dev)
1da177e4
LT		 454{
455 struct inet6_dev *idev;
456
457 ASSERT_RTNL();
458
e21e8467
SH		 459 idev = __in6_dev_get(dev);
460 if (!idev) {
461 idev = ipv6_add_dev(dev);
a317a2f1 462 if (IS_ERR(idev))
1da177e4
LT		 463 return NULL;
464 }
c5e33bdd 465
1da177e4
LT		 466 if (dev->flags&IFF_UP)
467 ipv6_mc_up(idev);
468 return idev;
469}
470
f3a1bfb1
ND		 471static int inet6_netconf_msgsize_devconf(int type)
472{
473 int size = NLMSG_ALIGN(sizeof(struct netconfmsg))
474 + nla_total_size(4); /* NETCONFA_IFINDEX */
136ba622 475 bool all = false;
f3a1bfb1 476
136ba622
ZS		 477 if (type == NETCONFA_ALL)
478 all = true;
479
480 if (all || type == NETCONFA_FORWARDING)
f3a1bfb1 481 size += nla_total_size(4);
b1afce95 482#ifdef CONFIG_IPV6_MROUTE
136ba622 483 if (all || type == NETCONFA_MC_FORWARDING)
d67b8c61 484 size += nla_total_size(4);
b1afce95 485#endif
136ba622 486 if (all || type == NETCONFA_PROXY_NEIGH)
c92d5491 487 size += nla_total_size(4);
f3a1bfb1 488
136ba622 489 if (all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN)
35103d11
AG		 490 size += nla_total_size(4);
491
f3a1bfb1
ND		 492 return size;
493}
494
495static int inet6_netconf_fill_devconf(struct sk_buff *skb, int ifindex,
496 struct ipv6_devconf *devconf, u32 portid,
497 u32 seq, int event, unsigned int flags,
498 int type)
499{
500 struct nlmsghdr *nlh;
501 struct netconfmsg *ncm;
136ba622 502 bool all = false;
f3a1bfb1
ND		 503
504 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg),
505 flags);
63159f29 506 if (!nlh)
f3a1bfb1
ND		 507 return -EMSGSIZE;
508
136ba622
ZS		 509 if (type == NETCONFA_ALL)
510 all = true;
511
f3a1bfb1
ND		 512 ncm = nlmsg_data(nlh);
513 ncm->ncm_family = AF_INET6;
514
515 if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0)
516 goto nla_put_failure;
517
136ba622 518 if ((all || type == NETCONFA_FORWARDING) &&
f3a1bfb1
ND		 519 nla_put_s32(skb, NETCONFA_FORWARDING, devconf->forwarding) < 0)
520 goto nla_put_failure;
b1afce95 521#ifdef CONFIG_IPV6_MROUTE
136ba622 522 if ((all || type == NETCONFA_MC_FORWARDING) &&
d67b8c61
ND		 523 nla_put_s32(skb, NETCONFA_MC_FORWARDING,
524 devconf->mc_forwarding) < 0)
525 goto nla_put_failure;
b1afce95 526#endif
136ba622 527 if ((all || type == NETCONFA_PROXY_NEIGH) &&
c92d5491 528 nla_put_s32(skb, NETCONFA_PROXY_NEIGH, devconf->proxy_ndp) < 0)
529 goto nla_put_failure;
530
136ba622 531 if ((all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN) &&
35103d11
AG		 532 nla_put_s32(skb, NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
533 devconf->ignore_routes_with_linkdown) < 0)
534 goto nla_put_failure;
535
053c095a
JB		 536 nlmsg_end(skb, nlh);
537 return 0;
f3a1bfb1
ND		 538
539nla_put_failure:
540 nlmsg_cancel(skb, nlh);
541 return -EMSGSIZE;
542}
543
d67b8c61
ND		 544void inet6_netconf_notify_devconf(struct net *net, int type, int ifindex,
545 struct ipv6_devconf *devconf)
f3a1bfb1
ND		 546{
547 struct sk_buff *skb;
548 int err = -ENOBUFS;
549
550 skb = nlmsg_new(inet6_netconf_msgsize_devconf(type), GFP_ATOMIC);
63159f29 551 if (!skb)
f3a1bfb1
ND		 552 goto errout;
553
554 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 0, 0,
555 RTM_NEWNETCONF, 0, type);
556 if (err < 0) {
557 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
558 WARN_ON(err == -EMSGSIZE);
559 kfree_skb(skb);
560 goto errout;
561 }
562 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_NETCONF, NULL, GFP_ATOMIC);
563 return;
564errout:
bd779028 565 rtnl_set_sk_err(net, RTNLGRP_IPV6_NETCONF, err);
f3a1bfb1
ND		 566}
567
76f8f6cb
ND		 568static const struct nla_policy devconf_ipv6_policy[NETCONFA_MAX+1] = {
569 [NETCONFA_IFINDEX] = { .len = sizeof(int) },
570 [NETCONFA_FORWARDING] = { .len = sizeof(int) },
c92d5491 571 [NETCONFA_PROXY_NEIGH] = { .len = sizeof(int) },
35103d11 572 [NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN] = { .len = sizeof(int) },
76f8f6cb
ND		 573};
574
575static int inet6_netconf_get_devconf(struct sk_buff *in_skb,
661d2967 576 struct nlmsghdr *nlh)
76f8f6cb
ND		 577{
578 struct net *net = sock_net(in_skb->sk);
579 struct nlattr *tb[NETCONFA_MAX+1];
580 struct netconfmsg *ncm;
581 struct sk_buff *skb;
582 struct ipv6_devconf *devconf;
583 struct inet6_dev *in6_dev;
584 struct net_device *dev;
585 int ifindex;
586 int err;
587
588 err = nlmsg_parse(nlh, sizeof(*ncm), tb, NETCONFA_MAX,
589 devconf_ipv6_policy);
590 if (err < 0)
591 goto errout;
592
a97eb33f 593 err = -EINVAL;
76f8f6cb
ND		 594 if (!tb[NETCONFA_IFINDEX])
595 goto errout;
596
597 ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]);
598 switch (ifindex) {
599 case NETCONFA_IFINDEX_ALL:
600 devconf = net->ipv6.devconf_all;
601 break;
602 case NETCONFA_IFINDEX_DEFAULT:
603 devconf = net->ipv6.devconf_dflt;
604 break;
605 default:
606 dev = __dev_get_by_index(net, ifindex);
63159f29 607 if (!dev)
76f8f6cb
ND		 608 goto errout;
609 in6_dev = __in6_dev_get(dev);
63159f29 610 if (!in6_dev)
76f8f6cb
ND		 611 goto errout;
612 devconf = &in6_dev->cnf;
613 break;
614 }
615
616 err = -ENOBUFS;
136ba622 617 skb = nlmsg_new(inet6_netconf_msgsize_devconf(NETCONFA_ALL), GFP_ATOMIC);
63159f29 618 if (!skb)
76f8f6cb
ND		 619 goto errout;
620
621 err = inet6_netconf_fill_devconf(skb, ifindex, devconf,
622 NETLINK_CB(in_skb).portid,
623 nlh->nlmsg_seq, RTM_NEWNETCONF, 0,
136ba622 624 NETCONFA_ALL);
76f8f6cb
ND		 625 if (err < 0) {
626 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
627 WARN_ON(err == -EMSGSIZE);
628 kfree_skb(skb);
629 goto errout;
630 }
631 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
632errout:
633 return err;
634}
635
7a674200
ND		 636static int inet6_netconf_dump_devconf(struct sk_buff *skb,
637 struct netlink_callback *cb)
638{
639 struct net *net = sock_net(skb->sk);
640 int h, s_h;
641 int idx, s_idx;
642 struct net_device *dev;
643 struct inet6_dev *idev;
644 struct hlist_head *head;
645
646 s_h = cb->args[0];
647 s_idx = idx = cb->args[1];
648
649 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
650 idx = 0;
651 head = &net->dev_index_head[h];
652 rcu_read_lock();
63998ac2
ND		 653 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^
654 net->dev_base_seq;
7a674200
ND		 655 hlist_for_each_entry_rcu(dev, head, index_hlist) {
656 if (idx < s_idx)
657 goto cont;
658 idev = __in6_dev_get(dev);
659 if (!idev)
660 goto cont;
661
662 if (inet6_netconf_fill_devconf(skb, dev->ifindex,
663 &idev->cnf,
664 NETLINK_CB(cb->skb).portid,
665 cb->nlh->nlmsg_seq,
666 RTM_NEWNETCONF,
667 NLM_F_MULTI,
136ba622 668 NETCONFA_ALL) < 0) {
7a674200
ND		 669 rcu_read_unlock();
670 goto done;
671 }
63998ac2 672 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
7a674200
ND		 673cont:
674 idx++;
675 }
676 rcu_read_unlock();
677 }
678 if (h == NETDEV_HASHENTRIES) {
679 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL,
680 net->ipv6.devconf_all,
681 NETLINK_CB(cb->skb).portid,
682 cb->nlh->nlmsg_seq,
683 RTM_NEWNETCONF, NLM_F_MULTI,
136ba622 684 NETCONFA_ALL) < 0)
7a674200
ND		 685 goto done;
686 else
687 h++;
688 }
689 if (h == NETDEV_HASHENTRIES + 1) {
690 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT,
691 net->ipv6.devconf_dflt,
692 NETLINK_CB(cb->skb).portid,
693 cb->nlh->nlmsg_seq,
694 RTM_NEWNETCONF, NLM_F_MULTI,
136ba622 695 NETCONFA_ALL) < 0)
7a674200
ND		 696 goto done;
697 else
698 h++;
699 }
700done:
701 cb->args[0] = h;
702 cb->args[1] = idx;
703
704 return skb->len;
705}
706
1da177e4
LT		 707#ifdef CONFIG_SYSCTL
708static void dev_forward_change(struct inet6_dev *idev)
709{
710 struct net_device *dev;
711 struct inet6_ifaddr *ifa;
1da177e4
LT		 712
713 if (!idev)
714 return;
715 dev = idev->dev;
0187bdfb
BH		 716 if (idev->cnf.forwarding)
717 dev_disable_lro(dev);
1a940835 718 if (dev->flags & IFF_MULTICAST) {
2c5e8933 719 if (idev->cnf.forwarding) {
f3ee4010 720 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
2c5e8933
HFS		 721 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allrouters);
722 ipv6_dev_mc_inc(dev, &in6addr_sitelocal_allrouters);
723 } else {
f3ee4010 724 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
2c5e8933
HFS		 725 ipv6_dev_mc_dec(dev, &in6addr_interfacelocal_allrouters);
726 ipv6_dev_mc_dec(dev, &in6addr_sitelocal_allrouters);
727 }
1da177e4 728 }
502a2ffd 729
730 list_for_each_entry(ifa, &idev->addr_list, if_list) {
2c12a74c
MW		 731 if (ifa->flags&IFA_F_TENTATIVE)
732 continue;
1da177e4
LT		 733 if (idev->cnf.forwarding)
734 addrconf_join_anycast(ifa);
735 else
736 addrconf_leave_anycast(ifa);
737 }
f3a1bfb1
ND		 738 inet6_netconf_notify_devconf(dev_net(dev), NETCONFA_FORWARDING,
739 dev->ifindex, &idev->cnf);
1da177e4
LT		 740}
741
742
e186932b 743static void addrconf_forward_change(struct net *net, __s32 newf)
1da177e4
LT		 744{
745 struct net_device *dev;
746 struct inet6_dev *idev;
747
4acd4945 748 for_each_netdev(net, dev) {
1da177e4
LT		 749 idev = __in6_dev_get(dev);
750 if (idev) {
e186932b
PE		 751 int changed = (!idev->cnf.forwarding) ^ (!newf);
752 idev->cnf.forwarding = newf;
1da177e4
LT		 753 if (changed)
754 dev_forward_change(idev);
755 }
1da177e4 756 }
1da177e4 757}
c8fecf22 758
013d97e9 759static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf)
c8fecf22 760{
bff16c2f 761 struct net *net;
013d97e9
FR		 762 int old;
763
764 if (!rtnl_trylock())
765 return restart_syscall();
bff16c2f
PE		 766
767 net = (struct net *)table->extra2;
013d97e9
FR		 768 old = *p;
769 *p = newf;
b325fddb 770
013d97e9 771 if (p == &net->ipv6.devconf_dflt->forwarding) {
f3a1bfb1
ND		 772 if ((!newf) ^ (!old))
773 inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING,
774 NETCONFA_IFINDEX_DEFAULT,
775 net->ipv6.devconf_dflt);
013d97e9
FR		 776 rtnl_unlock();
777 return 0;
88af182e 778 }
c8fecf22 779
e186932b 780 if (p == &net->ipv6.devconf_all->forwarding) {
e186932b
PE		 781 net->ipv6.devconf_dflt->forwarding = newf;
782 addrconf_forward_change(net, newf);
f3a1bfb1
ND		 783 if ((!newf) ^ (!old))
784 inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING,
785 NETCONFA_IFINDEX_ALL,
786 net->ipv6.devconf_all);
013d97e9 787 } else if ((!newf) ^ (!old))
c8fecf22 788 dev_forward_change((struct inet6_dev *)table->extra1);
0187bdfb 789 rtnl_unlock();
c8fecf22 790
013d97e9 791 if (newf)
7b4da532 792 rt6_purge_dflt_routers(net);
b325fddb 793 return 1;
c8fecf22 794}
35103d11
AG		 795
796static void addrconf_linkdown_change(struct net *net, __s32 newf)
797{
798 struct net_device *dev;
799 struct inet6_dev *idev;
800
801 for_each_netdev(net, dev) {
802 idev = __in6_dev_get(dev);
803 if (idev) {
804 int changed = (!idev->cnf.ignore_routes_with_linkdown) ^ (!newf);
805
806 idev->cnf.ignore_routes_with_linkdown = newf;
807 if (changed)
808 inet6_netconf_notify_devconf(dev_net(dev),
809 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
810 dev->ifindex,
811 &idev->cnf);
812 }
813 }
814}
815
816static int addrconf_fixup_linkdown(struct ctl_table *table, int *p, int newf)
817{
818 struct net *net;
819 int old;
820
821 if (!rtnl_trylock())
822 return restart_syscall();
823
824 net = (struct net *)table->extra2;
825 old = *p;
826 *p = newf;
827
828 if (p == &net->ipv6.devconf_dflt->ignore_routes_with_linkdown) {
829 if ((!newf) ^ (!old))
830 inet6_netconf_notify_devconf(net,
831 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
832 NETCONFA_IFINDEX_DEFAULT,
833 net->ipv6.devconf_dflt);
834 rtnl_unlock();
835 return 0;
836 }
837
838 if (p == &net->ipv6.devconf_all->ignore_routes_with_linkdown) {
839 net->ipv6.devconf_dflt->ignore_routes_with_linkdown = newf;
840 addrconf_linkdown_change(net, newf);
841 if ((!newf) ^ (!old))
842 inet6_netconf_notify_devconf(net,
843 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
844 NETCONFA_IFINDEX_ALL,
845 net->ipv6.devconf_all);
846 }
847 rtnl_unlock();
848
849 return 1;
850}
851
1da177e4
LT		 852#endif
853
5c578aed 854/* Nobody refers to this ifaddr, destroy it */
1da177e4
LT		 855void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
856{
c2e21293 857 WARN_ON(!hlist_unhashed(&ifp->addr_lst));
547b792c 858
1da177e4 859#ifdef NET_REFCNT_DEBUG
91df42be 860 pr_debug("%s\n", __func__);
1da177e4
LT		 861#endif
862
863 in6_dev_put(ifp->idev);
864
c15b1cca
HFS		 865 if (cancel_delayed_work(&ifp->dad_work))
866 pr_notice("delayed DAD work was pending while freeing ifa=%p\n",
867 ifp);
1da177e4 868
e9d3e084 869 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
f3213831 870 pr_warn("Freeing alive inet6 address %p\n", ifp);
1da177e4
LT		 871 return;
872 }
94e187c0 873 ip6_rt_put(ifp->rt);
1da177e4 874
e5785985 875 kfree_rcu(ifp, rcu);
1da177e4
LT		 876}
877
e55ffac6
BH		 878static void
879ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
880{
502a2ffd 881 struct list_head *p;
8a6ce0c0 882 int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
e55ffac6
BH		 883
884 /*
885 * Each device address list is sorted in order of scope -
886 * global before linklocal.
887 */
502a2ffd 888 list_for_each(p, &idev->addr_list) {
889 struct inet6_ifaddr *ifa
890 = list_entry(p, struct inet6_ifaddr, if_list);
8a6ce0c0 891 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
e55ffac6
BH		 892 break;
893 }
894
b54c9b98 895 list_add_tail(&ifp->if_list, p);
e55ffac6
BH		 896}
897
ddbe5032 898static u32 inet6_addr_hash(const struct in6_addr *addr)
3eb84f49 899{
ddbe5032 900 return hash_32(ipv6_addr_hash(addr), IN6_ADDR_HSIZE_SHIFT);
3eb84f49
YH		 901}
902
1da177e4
LT		 903/* On success it returns ifp with increased reference count */
904
905static struct inet6_ifaddr *
3f8f5298
JP		 906ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
907 const struct in6_addr *peer_addr, int pfxlen,
8a226b2c 908 int scope, u32 flags, u32 valid_lft, u32 prefered_lft)
1da177e4
LT		 909{
910 struct inet6_ifaddr *ifa = NULL;
911 struct rt6_info *rt;
3a88a81d 912 unsigned int hash;
1da177e4 913 int err = 0;
d68b8270
YH		 914 int addr_type = ipv6_addr_type(addr);
915
916 if (addr_type == IPV6_ADDR_ANY ||
917 addr_type & IPV6_ADDR_MULTICAST ||
918 (!(idev->dev->flags & IFF_LOOPBACK) &&
919 addr_type & IPV6_ADDR_LOOPBACK))
920 return ERR_PTR(-EADDRNOTAVAIL);
1da177e4 921
8814c4b5 922 rcu_read_lock_bh();
1da177e4
LT		 923 if (idev->dead) {
924 err = -ENODEV; /*XXX*/
925 goto out2;
926 }
927
56d417b1 928 if (idev->cnf.disable_ipv6) {
9bdd8d40
BH		 929 err = -EACCES;
930 goto out2;
931 }
932
5c578aed 933 spin_lock(&addrconf_hash_lock);
1da177e4
LT		 934
935 /* Ignore adding duplicate addresses on an interface */
c346dca1 936 if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) {
ba3542e1 937 ADBG("ipv6_add_addr: already assigned\n");
1da177e4
LT		 938 err = -EEXIST;
939 goto out;
940 }
941
322f74a4 942 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
1da177e4 943
63159f29 944 if (!ifa) {
ba3542e1 945 ADBG("ipv6_add_addr: malloc failed\n");
1da177e4
LT		 946 err = -ENOBUFS;
947 goto out;
948 }
949
8f031519 950 rt = addrconf_dst_alloc(idev, addr, false);
1da177e4
LT		 951 if (IS_ERR(rt)) {
952 err = PTR_ERR(rt);
953 goto out;
954 }
955
bba24896
JP		 956 neigh_parms_data_state_setall(idev->nd_parms);
957
4e3fd7a0 958 ifa->addr = *addr;
3f8f5298
JP		 959 if (peer_addr)
960 ifa->peer_addr = *peer_addr;
1da177e4
LT		 961
962 spin_lock_init(&ifa->lock);
c15b1cca 963 INIT_DELAYED_WORK(&ifa->dad_work, addrconf_dad_work);
c2e21293 964 INIT_HLIST_NODE(&ifa->addr_lst);
1da177e4
LT		 965 ifa->scope = scope;
966 ifa->prefix_len = pfxlen;
967 ifa->flags = flags | IFA_F_TENTATIVE;
8a226b2c
JB		 968 ifa->valid_lft = valid_lft;
969 ifa->prefered_lft = prefered_lft;
1da177e4 970 ifa->cstamp = ifa->tstamp = jiffies;
617fe29d 971 ifa->tokenized = false;
1da177e4 972
57f5f544
KF		 973 ifa->rt = rt;
974
1da177e4
LT		 975 ifa->idev = idev;
976 in6_dev_hold(idev);
977 /* For caller */
978 in6_ifa_hold(ifa);
979
980 /* Add to big hash table */
ddbe5032 981 hash = inet6_addr_hash(addr);
1da177e4 982
5c578aed 983 hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]);
5c578aed 984 spin_unlock(&addrconf_hash_lock);
1da177e4
LT		 985
986 write_lock(&idev->lock);
987 /* Add to inet6_dev unicast addr list. */
e55ffac6 988 ipv6_link_dev_addr(idev, ifa);
1da177e4 989
1da177e4 990 if (ifa->flags&IFA_F_TEMPORARY) {
372e6c8f 991 list_add(&ifa->tmp_list, &idev->tempaddr_list);
1da177e4
LT		 992 in6_ifa_hold(ifa);
993 }
1da177e4 994
1da177e4
LT		 995 in6_ifa_hold(ifa);
996 write_unlock(&idev->lock);
997out2:
8814c4b5 998 rcu_read_unlock_bh();
1da177e4 999
fd92833a 1000 if (likely(err == 0))
f88c91dd 1001 inet6addr_notifier_call_chain(NETDEV_UP, ifa);
1da177e4
LT		 1002 else {
1003 kfree(ifa);
1004 ifa = ERR_PTR(err);
1005 }
1006
1007 return ifa;
1008out:
5c578aed 1009 spin_unlock(&addrconf_hash_lock);
1da177e4
LT		 1010 goto out2;
1011}
1012
5b84efec
TH		 1013enum cleanup_prefix_rt_t {
1014 CLEANUP_PREFIX_RT_NOP, /* no cleanup action for prefix route */
1015 CLEANUP_PREFIX_RT_DEL, /* delete the prefix route */
1016 CLEANUP_PREFIX_RT_EXPIRE, /* update the lifetime of the prefix route */
1017};
1018
1019/*
1020 * Check, whether the prefix for ifp would still need a prefix route
1021 * after deleting ifp. The function returns one of the CLEANUP_PREFIX_RT_*
1022 * constants.
1023 *
1024 * 1) we don't purge prefix if address was not permanent.
1025 * prefix is managed by its own lifetime.
1026 * 2) we also don't purge, if the address was IFA_F_NOPREFIXROUTE.
1027 * 3) if there are no addresses, delete prefix.
1028 * 4) if there are still other permanent address(es),
1029 * corresponding prefix is still permanent.
1030 * 5) if there are still other addresses with IFA_F_NOPREFIXROUTE,
1031 * don't purge the prefix, assume user space is managing it.
1032 * 6) otherwise, update prefix lifetime to the
1033 * longest valid lifetime among the corresponding
1034 * addresses on the device.
1035 * Note: subsequent RA will update lifetime.
1036 **/
1037static enum cleanup_prefix_rt_t
1038check_cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long *expires)
1039{
1040 struct inet6_ifaddr *ifa;
1041 struct inet6_dev *idev = ifp->idev;
1042 unsigned long lifetime;
1043 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_DEL;
1044
1045 *expires = jiffies;
1046
1047 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1048 if (ifa == ifp)
1049 continue;
1050 if (!ipv6_prefix_equal(&ifa->addr, &ifp->addr,
1051 ifp->prefix_len))
1052 continue;
1053 if (ifa->flags & (IFA_F_PERMANENT | IFA_F_NOPREFIXROUTE))
1054 return CLEANUP_PREFIX_RT_NOP;
1055
1056 action = CLEANUP_PREFIX_RT_EXPIRE;
1057
1058 spin_lock(&ifa->lock);
1059
1060 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
1061 /*
1062 * Note: Because this address is
1063 * not permanent, lifetime <
1064 * LONG_MAX / HZ here.
1065 */
1066 if (time_before(*expires, ifa->tstamp + lifetime * HZ))
1067 *expires = ifa->tstamp + lifetime * HZ;
1068 spin_unlock(&ifa->lock);
1069 }
1070
1071 return action;
1072}
1073
1074static void
1075cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long expires, bool del_rt)
1076{
1077 struct rt6_info *rt;
1078
1079 rt = addrconf_get_prefix_route(&ifp->addr,
1080 ifp->prefix_len,
1081 ifp->idev->dev,
1082 0, RTF_GATEWAY | RTF_DEFAULT);
1083 if (rt) {
1084 if (del_rt)
1085 ip6_del_rt(rt);
1086 else {
1087 if (!(rt->rt6i_flags & RTF_EXPIRES))
1088 rt6_set_expires(rt, expires);
1089 ip6_rt_put(rt);
1090 }
1091 }
1092}
1093
1094
1da177e4
LT		 1095/* This function wants to get referenced ifp and releases it before return */
1096
1097static void ipv6_del_addr(struct inet6_ifaddr *ifp)
1098{
4c5ff6a6 1099 int state;
5b84efec
TH		 1100 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_NOP;
1101 unsigned long expires;
1da177e4 1102
c15b1cca
HFS		 1103 ASSERT_RTNL();
1104
8e8e676d 1105 spin_lock_bh(&ifp->lock);
4c5ff6a6 1106 state = ifp->state;
e9d3e084 1107 ifp->state = INET6_IFADDR_STATE_DEAD;
8e8e676d 1108 spin_unlock_bh(&ifp->lock);
4c5ff6a6
HX		 1109
1110 if (state == INET6_IFADDR_STATE_DEAD)
1111 goto out;
1da177e4 1112
5c578aed 1113 spin_lock_bh(&addrconf_hash_lock);
1114 hlist_del_init_rcu(&ifp->addr_lst);
5c578aed 1115 spin_unlock_bh(&addrconf_hash_lock);
1da177e4 1116
5b84efec 1117 write_lock_bh(&ifp->idev->lock);
5d9efa7e 1118
1da177e4 1119 if (ifp->flags&IFA_F_TEMPORARY) {
372e6c8f 1120 list_del(&ifp->tmp_list);
1121 if (ifp->ifpub) {
1122 in6_ifa_put(ifp->ifpub);
1123 ifp->ifpub = NULL;
1da177e4 1124 }
372e6c8f 1125 __in6_ifa_put(ifp);
1da177e4 1126 }
1da177e4 1127
5b84efec
TH		 1128 if (ifp->flags & IFA_F_PERMANENT && !(ifp->flags & IFA_F_NOPREFIXROUTE))
1129 action = check_cleanup_prefix_route(ifp, &expires);
502a2ffd 1130
5b84efec
TH		 1131 list_del_init(&ifp->if_list);
1132 __in6_ifa_put(ifp);
1133
1134 write_unlock_bh(&ifp->idev->lock);
1da177e4 1135
c15b1cca 1136 addrconf_del_dad_work(ifp);
b2238566 1137
1da177e4
LT		 1138 ipv6_ifa_notify(RTM_DELADDR, ifp);
1139
f88c91dd 1140 inet6addr_notifier_call_chain(NETDEV_DOWN, ifp);
1da177e4 1141
5b84efec
TH		 1142 if (action != CLEANUP_PREFIX_RT_NOP) {
1143 cleanup_prefix_route(ifp, expires,
1144 action == CLEANUP_PREFIX_RT_DEL);
1da177e4
LT		 1145 }
1146
c3968a85
DW		 1147 /* clean up prefsrc entries */
1148 rt6_remove_prefsrc(ifp);
4c5ff6a6 1149out:
1da177e4
LT		 1150 in6_ifa_put(ifp);
1151}
1152
1da177e4
LT		 1153static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
1154{
1155 struct inet6_dev *idev = ifp->idev;
1156 struct in6_addr addr, *tmpaddr;
76f793e3 1157 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_tstamp, age;
eac55bf9 1158 unsigned long regen_advance;
1da177e4
LT		 1159 int tmp_plen;
1160 int ret = 0;
95c385b4 1161 u32 addr_flags;
76f793e3 1162 unsigned long now = jiffies;
1da177e4 1163
53bd6749 1164 write_lock_bh(&idev->lock);
1da177e4
LT		 1165 if (ift) {
1166 spin_lock_bh(&ift->lock);
1167 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
1168 spin_unlock_bh(&ift->lock);
1169 tmpaddr = &addr;
1170 } else {
1171 tmpaddr = NULL;
1172 }
1173retry:
1174 in6_dev_hold(idev);
1175 if (idev->cnf.use_tempaddr <= 0) {
53bd6749 1176 write_unlock_bh(&idev->lock);
f3213831 1177 pr_info("%s: use_tempaddr is disabled\n", __func__);
1da177e4
LT		 1178 in6_dev_put(idev);
1179 ret = -1;
1180 goto out;
1181 }
1182 spin_lock_bh(&ifp->lock);
1183 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
1184 idev->cnf.use_tempaddr = -1; /*XXX*/
1185 spin_unlock_bh(&ifp->lock);
53bd6749 1186 write_unlock_bh(&idev->lock);
f3213831
JP		 1187 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n",
1188 __func__);
1da177e4
LT		 1189 in6_dev_put(idev);
1190 ret = -1;
1191 goto out;
1192 }
1193 in6_ifa_hold(ifp);
1194 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
eb7e0575 1195 __ipv6_try_regen_rndid(idev, tmpaddr);
1da177e4 1196 memcpy(&addr.s6_addr[8], idev->rndid, 8);
76f793e3 1197 age = (now - ifp->tstamp) / HZ;
1da177e4
LT		 1198 tmp_valid_lft = min_t(__u32,
1199 ifp->valid_lft,
7a876b0e 1200 idev->cnf.temp_valid_lft + age);
1ab1457c
YH		 1201 tmp_prefered_lft = min_t(__u32,
1202 ifp->prefered_lft,
7a876b0e 1203 idev->cnf.temp_prefered_lft + age -
784e2710 1204 idev->cnf.max_desync_factor);
1da177e4 1205 tmp_plen = ifp->prefix_len;
1da177e4
LT		 1206 tmp_tstamp = ifp->tstamp;
1207 spin_unlock_bh(&ifp->lock);
1208
eac55bf9 1209 regen_advance = idev->cnf.regen_max_retry *
67ba4152
IM		 1210 idev->cnf.dad_transmits *
1211 NEIGH_VAR(idev->nd_parms, RETRANS_TIME) / HZ;
53bd6749 1212 write_unlock_bh(&idev->lock);
95c385b4 1213
eac55bf9
BB		 1214 /* A temporary address is created only if this calculated Preferred
1215 * Lifetime is greater than REGEN_ADVANCE time units. In particular,
1216 * an implementation must not create a temporary address with a zero
1217 * Preferred Lifetime.
ecab6701
HK		 1218 * Use age calculation as in addrconf_verify to avoid unnecessary
1219 * temporary addresses being generated.
eac55bf9 1220 */
ecab6701
HK		 1221 age = (now - tmp_tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
1222 if (tmp_prefered_lft <= regen_advance + age) {
eac55bf9
BB		 1223 in6_ifa_put(ifp);
1224 in6_dev_put(idev);
1225 ret = -1;
1226 goto out;
1227 }
1228
95c385b4
NH		 1229 addr_flags = IFA_F_TEMPORARY;
1230 /* set in addrconf_prefix_rcv() */
1231 if (ifp->flags & IFA_F_OPTIMISTIC)
1232 addr_flags |= IFA_F_OPTIMISTIC;
1233
4b08a8f1
HFS		 1234 ift = ipv6_add_addr(idev, &addr, NULL, tmp_plen,
1235 ipv6_addr_scope(&addr), addr_flags,
1236 tmp_valid_lft, tmp_prefered_lft);
1237 if (IS_ERR(ift)) {
1da177e4
LT		 1238 in6_ifa_put(ifp);
1239 in6_dev_put(idev);
f3213831 1240 pr_info("%s: retry temporary address regeneration\n", __func__);
1da177e4 1241 tmpaddr = &addr;
53bd6749 1242 write_lock_bh(&idev->lock);
1da177e4
LT		 1243 goto retry;
1244 }
1245
1246 spin_lock_bh(&ift->lock);
1247 ift->ifpub = ifp;
76f793e3 1248 ift->cstamp = now;
1da177e4
LT		 1249 ift->tstamp = tmp_tstamp;
1250 spin_unlock_bh(&ift->lock);
1251
cf22f9a2 1252 addrconf_dad_start(ift);
1da177e4
LT		 1253 in6_ifa_put(ift);
1254 in6_dev_put(idev);
1255out:
1256 return ret;
1257}
1da177e4
LT		 1258
1259/*
072047e4 1260 * Choose an appropriate source address (RFC3484)
1da177e4 1261 */
a9b05723
YH		 1262enum {
1263 IPV6_SADDR_RULE_INIT = 0,
1264 IPV6_SADDR_RULE_LOCAL,
1265 IPV6_SADDR_RULE_SCOPE,
1266 IPV6_SADDR_RULE_PREFERRED,
1267#ifdef CONFIG_IPV6_MIP6
1268 IPV6_SADDR_RULE_HOA,
1269#endif
1270 IPV6_SADDR_RULE_OIF,
1271 IPV6_SADDR_RULE_LABEL,
a9b05723 1272 IPV6_SADDR_RULE_PRIVACY,
a9b05723
YH		 1273 IPV6_SADDR_RULE_ORCHID,
1274 IPV6_SADDR_RULE_PREFIX,
7fd2561e
EK		 1275#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1276 IPV6_SADDR_RULE_NOT_OPTIMISTIC,
1277#endif
a9b05723
YH		 1278 IPV6_SADDR_RULE_MAX
1279};
1280
072047e4 1281struct ipv6_saddr_score {
a9b05723
YH		 1282 int rule;
1283 int addr_type;
1284 struct inet6_ifaddr *ifa;
1285 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
1286 int scopedist;
1287 int matchlen;
072047e4
YH		 1288};
1289
a9b05723 1290struct ipv6_saddr_dst {
9acd9f3a 1291 const struct in6_addr *addr;
a9b05723
YH		 1292 int ifindex;
1293 int scope;
1294 int label;
7cbca67c 1295 unsigned int prefs;
a9b05723 1296};
072047e4 1297
b6f99a21 1298static inline int ipv6_saddr_preferred(int type)
1da177e4 1299{
45bb0060 1300 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
072047e4
YH		 1301 return 1;
1302 return 0;
1da177e4
LT		 1303}
1304
7fd2561e
EK		 1305static inline bool ipv6_use_optimistic_addr(struct inet6_dev *idev)
1306{
1307#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1308 return idev && idev->cnf.optimistic_dad && idev->cnf.use_optimistic;
1309#else
1310 return false;
1311#endif
1312}
1313
3de23255
BT		 1314static int ipv6_get_saddr_eval(struct net *net,
1315 struct ipv6_saddr_score *score,
a9b05723
YH		 1316 struct ipv6_saddr_dst *dst,
1317 int i)
1318{
1319 int ret;
1320
1321 if (i <= score->rule) {
1322 switch (i) {
1323 case IPV6_SADDR_RULE_SCOPE:
1324 ret = score->scopedist;
1325 break;
1326 case IPV6_SADDR_RULE_PREFIX:
1327 ret = score->matchlen;
1328 break;
1329 default:
1330 ret = !!test_bit(i, score->scorebits);
1331 }
1332 goto out;
1333 }
1334
1335 switch (i) {
1336 case IPV6_SADDR_RULE_INIT:
1337 /* Rule 0: remember if hiscore is not ready yet */
1338 ret = !!score->ifa;
1339 break;
1340 case IPV6_SADDR_RULE_LOCAL:
1341 /* Rule 1: Prefer same address */
1342 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1343 break;
1344 case IPV6_SADDR_RULE_SCOPE:
1345 /* Rule 2: Prefer appropriate scope
1346 *
1347 * ret
1348 * ^
1349 * -1 | d 15
1350 * ---+--+-+---> scope
1351 * |
1352 * | d is scope of the destination.
1353 * B-d | \
1354 * | \ <- smaller scope is better if
db9c7c39 1355 * B-15 | \ if scope is enough for destination.
a9b05723
YH		 1356 * | ret = B - scope (-1 <= scope >= d <= 15).
1357 * d-C-1 | /
1358 * |/ <- greater is better
1359 * -C / if scope is not enough for destination.
1360 * /| ret = scope - C (-1 <= d < scope <= 15).
1361 *
1362 * d - C - 1 < B -15 (for all -1 <= d <= 15).
1363 * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1364 * Assume B = 0 and we get C > 29.
1365 */
1366 ret = __ipv6_addr_src_scope(score->addr_type);
1367 if (ret >= dst->scope)
1368 ret = -ret;
1369 else
1370 ret -= 128; /* 30 is enough */
1371 score->scopedist = ret;
1372 break;
1373 case IPV6_SADDR_RULE_PREFERRED:
7fd2561e 1374 {
a9b05723 1375 /* Rule 3: Avoid deprecated and optimistic addresses */
7fd2561e
EK		 1376 u8 avoid = IFA_F_DEPRECATED;
1377
1378 if (!ipv6_use_optimistic_addr(score->ifa->idev))
1379 avoid |= IFA_F_OPTIMISTIC;
a9b05723 1380 ret = ipv6_saddr_preferred(score->addr_type) ||
7fd2561e 1381 !(score->ifa->flags & avoid);
a9b05723 1382 break;
7fd2561e 1383 }
a9b05723
YH		 1384#ifdef CONFIG_IPV6_MIP6
1385 case IPV6_SADDR_RULE_HOA:
7cbca67c 1386 {
a9b05723 1387 /* Rule 4: Prefer home address */
7cbca67c
YH		 1388 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1389 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
a9b05723 1390 break;
7cbca67c 1391 }
a9b05723
YH		 1392#endif
1393 case IPV6_SADDR_RULE_OIF:
1394 /* Rule 5: Prefer outgoing interface */
1395 ret = (!dst->ifindex ||
1396 dst->ifindex == score->ifa->idev->dev->ifindex);
1397 break;
1398 case IPV6_SADDR_RULE_LABEL:
1399 /* Rule 6: Prefer matching label */
3de23255
BT		 1400 ret = ipv6_addr_label(net,
1401 &score->ifa->addr, score->addr_type,
a9b05723
YH		 1402 score->ifa->idev->dev->ifindex) == dst->label;
1403 break;
a9b05723 1404 case IPV6_SADDR_RULE_PRIVACY:
7cbca67c 1405 {
a9b05723 1406 /* Rule 7: Prefer public address
25985edc 1407 * Note: prefer temporary address if use_tempaddr >= 2
a9b05723 1408 */
7cbca67c
YH		 1409 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1410 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1411 score->ifa->idev->cnf.use_tempaddr >= 2;
1412 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
a9b05723 1413 break;
7cbca67c 1414 }
a9b05723
YH		 1415 case IPV6_SADDR_RULE_ORCHID:
1416 /* Rule 8-: Prefer ORCHID vs ORCHID or
1417 * non-ORCHID vs non-ORCHID
1418 */
1419 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1420 ipv6_addr_orchid(dst->addr));
1421 break;
1422 case IPV6_SADDR_RULE_PREFIX:
1423 /* Rule 8: Use longest matching prefix */
91b4b04f
YH		 1424 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr);
1425 if (ret > score->ifa->prefix_len)
1426 ret = score->ifa->prefix_len;
1427 score->matchlen = ret;
a9b05723 1428 break;
7fd2561e
EK		 1429#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1430 case IPV6_SADDR_RULE_NOT_OPTIMISTIC:
1431 /* Optimistic addresses still have lower precedence than other
1432 * preferred addresses.
1433 */
1434 ret = !(score->ifa->flags & IFA_F_OPTIMISTIC);
1435 break;
1436#endif
a9b05723
YH		 1437 default:
1438 ret = 0;
1439 }
1440
1441 if (ret)
1442 __set_bit(i, score->scorebits);
1443 score->rule = i;
1444out:
1445 return ret;
1446}
1447
c0b8da1e
YH		 1448static int __ipv6_dev_get_saddr(struct net *net,
1449 struct ipv6_saddr_dst *dst,
c0b8da1e
YH		 1450 struct inet6_dev *idev,
1451 struct ipv6_saddr_score *scores,
1452 int hiscore_idx)
9131f3de 1453{
c0b8da1e 1454 struct ipv6_saddr_score *score = &scores[1 - hiscore_idx], *hiscore = &scores[hiscore_idx];
9131f3de
YH		 1455
1456 read_lock_bh(&idev->lock);
1457 list_for_each_entry(score->ifa, &idev->addr_list, if_list) {
1458 int i;
1459
1460 /*
1461 * - Tentative Address (RFC2462 section 5.4)
1462 * - A tentative address is not considered
1463 * "assigned to an interface" in the traditional
1464 * sense, unless it is also flagged as optimistic.
1465 * - Candidate Source Address (section 4)
1466 * - In any case, anycast addresses, multicast
1467 * addresses, and the unspecified address MUST
1468 * NOT be included in a candidate set.
1469 */
1470 if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1471 (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
1472 continue;
1473
1474 score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1475
1476 if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1477 score->addr_type & IPV6_ADDR_MULTICAST)) {
1478 net_dbg_ratelimited("ADDRCONF: unspecified / multicast address assigned as unicast address on %s",
1479 idev->dev->name);
1480 continue;
1481 }
1482
1483 score->rule = -1;
1484 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1485
1486 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1487 int minihiscore, miniscore;
1488
1489 minihiscore = ipv6_get_saddr_eval(net, hiscore, dst, i);
1490 miniscore = ipv6_get_saddr_eval(net, score, dst, i);
1491
1492 if (minihiscore > miniscore) {
1493 if (i == IPV6_SADDR_RULE_SCOPE &&
1494 score->scopedist > 0) {
1495 /*
1496 * special case:
1497 * each remaining entry
1498 * has too small (not enough)
1499 * scope, because ifa entries
1500 * are sorted by their scope
1501 * values.
1502 */
1503 goto out;
1504 }
1505 break;
1506 } else if (minihiscore < miniscore) {
1507 if (hiscore->ifa)
1508 in6_ifa_put(hiscore->ifa);
1509
1510 in6_ifa_hold(score->ifa);
1511
1512 swap(hiscore, score);
c0b8da1e 1513 hiscore_idx = 1 - hiscore_idx;
9131f3de
YH		 1514
1515 /* restore our iterator */
1516 score->ifa = hiscore->ifa;
1517
1518 break;
1519 }
1520 }
1521 }
1522out:
1523 read_unlock_bh(&idev->lock);
c0b8da1e 1524 return hiscore_idx;
9131f3de
YH		 1525}
1526
b3f644fc 1527int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev,
9acd9f3a 1528 const struct in6_addr *daddr, unsigned int prefs,
7cbca67c 1529 struct in6_addr *saddr)
1da177e4 1530{
c0b8da1e 1531 struct ipv6_saddr_score scores[2], *hiscore;
a9b05723 1532 struct ipv6_saddr_dst dst;
9131f3de 1533 struct inet6_dev *idev;
072047e4 1534 struct net_device *dev;
a9b05723 1535 int dst_type;
9131f3de 1536 bool use_oif_addr = false;
c0b8da1e 1537 int hiscore_idx = 0;
1da177e4 1538
a9b05723
YH		 1539 dst_type = __ipv6_addr_type(daddr);
1540 dst.addr = daddr;
1541 dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1542 dst.scope = __ipv6_addr_src_scope(dst_type);
3de23255 1543 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
7cbca67c 1544 dst.prefs = prefs;
a9b05723 1545
c0b8da1e
YH		 1546 scores[hiscore_idx].rule = -1;
1547 scores[hiscore_idx].ifa = NULL;
1da177e4 1548
8814c4b5 1549 rcu_read_lock();
1da177e4 1550
9131f3de
YH		 1551 /* Candidate Source Address (section 4)
1552 * - multicast and link-local destination address,
1553 * the set of candidate source address MUST only
1554 * include addresses assigned to interfaces
1555 * belonging to the same link as the outgoing
1556 * interface.
1557 * (- For site-local destination addresses, the
1558 * set of candidate source addresses MUST only
1559 * include addresses assigned to interfaces
1560 * belonging to the same site as the outgoing
1561 * interface.)
3985e8a3
EK		 1562 * - "It is RECOMMENDED that the candidate source addresses
1563 * be the set of unicast addresses assigned to the
1564 * interface that will be used to send to the destination
1565 * (the 'outgoing' interface)." (RFC 6724)
9131f3de
YH		 1566 */
1567 if (dst_dev) {
3985e8a3 1568 idev = __in6_dev_get(dst_dev);
9131f3de 1569 if ((dst_type & IPV6_ADDR_MULTICAST) ||
3985e8a3
EK		 1570 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL ||
1571 (idev && idev->cnf.use_oif_addrs_only)) {
9131f3de
YH		 1572 use_oif_addr = true;
1573 }
1574 }
a9b05723 1575
9131f3de 1576 if (use_oif_addr) {
c0b8da1e 1577 if (idev)
c15df306 1578 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx);
9131f3de
YH		 1579 } else {
1580 for_each_netdev_rcu(net, dev) {
1581 idev = __in6_dev_get(dev);
1582 if (!idev)
072047e4 1583 continue;
c15df306 1584 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx);
1da177e4
LT		 1585 }
1586 }
8814c4b5 1587 rcu_read_unlock();
1da177e4 1588
c0b8da1e 1589 hiscore = &scores[hiscore_idx];
a9b05723 1590 if (!hiscore->ifa)
072047e4 1591 return -EADDRNOTAVAIL;
1ab1457c 1592
4e3fd7a0 1593 *saddr = hiscore->ifa->addr;
a9b05723 1594 in6_ifa_put(hiscore->ifa);
072047e4 1595 return 0;
1da177e4 1596}
5e5f3f0f 1597EXPORT_SYMBOL(ipv6_dev_get_saddr);
1da177e4 1598
8965779d 1599int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr,
479840ff 1600 u32 banned_flags)
b7b1bfce
HFS		 1601{
1602 struct inet6_ifaddr *ifp;
1603 int err = -EADDRNOTAVAIL;
1604
602582ca
HFS		 1605 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
1606 if (ifp->scope > IFA_LINK)
1607 break;
b7b1bfce
HFS		 1608 if (ifp->scope == IFA_LINK &&
1609 !(ifp->flags & banned_flags)) {
1610 *addr = ifp->addr;
1611 err = 0;
1612 break;
1613 }
1614 }
1615 return err;
1616}
1617
95c385b4 1618int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
479840ff 1619 u32 banned_flags)
1da177e4
LT		 1620{
1621 struct inet6_dev *idev;
1622 int err = -EADDRNOTAVAIL;
1623
8814c4b5 1624 rcu_read_lock();
e21e8467
SH		 1625 idev = __in6_dev_get(dev);
1626 if (idev) {
1da177e4 1627 read_lock_bh(&idev->lock);
b7b1bfce 1628 err = __ipv6_get_lladdr(idev, addr, banned_flags);
1da177e4
LT		 1629 read_unlock_bh(&idev->lock);
1630 }
8814c4b5 1631 rcu_read_unlock();
1da177e4
LT		 1632 return err;
1633}
1634
1635static int ipv6_count_addresses(struct inet6_dev *idev)
1636{
1637 int cnt = 0;
1638 struct inet6_ifaddr *ifp;
1639
1640 read_lock_bh(&idev->lock);
502a2ffd 1641 list_for_each_entry(ifp, &idev->addr_list, if_list)
1da177e4
LT		 1642 cnt++;
1643 read_unlock_bh(&idev->lock);
1644 return cnt;
1645}
1646
b71d1d42 1647int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
2a7851bf 1648 const struct net_device *dev, int strict)
c58da4c6
EK		 1649{
1650 return ipv6_chk_addr_and_flags(net, addr, dev, strict, IFA_F_TENTATIVE);
1651}
1652EXPORT_SYMBOL(ipv6_chk_addr);
1653
1654int ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr,
1655 const struct net_device *dev, int strict,
1656 u32 banned_flags)
1da177e4 1657{
eedf042a 1658 struct inet6_ifaddr *ifp;
ddbe5032 1659 unsigned int hash = inet6_addr_hash(addr);
c58da4c6 1660 u32 ifp_flags;
1da177e4 1661
5c578aed 1662 rcu_read_lock_bh();
b67bfe0d 1663 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
878628fb 1664 if (!net_eq(dev_net(ifp->idev->dev), net))
bfeade08 1665 continue;
c58da4c6
EK		 1666 /* Decouple optimistic from tentative for evaluation here.
1667 * Ban optimistic addresses explicitly, when required.
1668 */
1669 ifp_flags = (ifp->flags&IFA_F_OPTIMISTIC)
1670 ? (ifp->flags&~IFA_F_TENTATIVE)
1671 : ifp->flags;
1da177e4 1672 if (ipv6_addr_equal(&ifp->addr, addr) &&
c58da4c6 1673 !(ifp_flags&banned_flags) &&
63159f29 1674 (!dev || ifp->idev->dev == dev ||
eedf042a
SH		 1675 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) {
1676 rcu_read_unlock_bh();
1677 return 1;
1da177e4
LT		 1678 }
1679 }
5c578aed 1680
eedf042a
SH		 1681 rcu_read_unlock_bh();
1682 return 0;
1da177e4 1683}
c58da4c6 1684EXPORT_SYMBOL(ipv6_chk_addr_and_flags);
7159039a 1685
3e81c6da
DM		 1686static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1687 struct net_device *dev)
1da177e4 1688{
ddbe5032 1689 unsigned int hash = inet6_addr_hash(addr);
c2e21293 1690 struct inet6_ifaddr *ifp;
1da177e4 1691
b67bfe0d 1692 hlist_for_each_entry(ifp, &inet6_addr_lst[hash], addr_lst) {
878628fb 1693 if (!net_eq(dev_net(ifp->idev->dev), net))
06bfe655 1694 continue;
1da177e4 1695 if (ipv6_addr_equal(&ifp->addr, addr)) {
63159f29 1696 if (!dev || ifp->idev->dev == dev)
3e81c6da 1697 return true;
1da177e4
LT		 1698 }
1699 }
3e81c6da 1700 return false;
1da177e4
LT		 1701}
1702
7df37ff3
CB		 1703/* Compares an address/prefix_len with addresses on device @dev.
1704 * If one is found it returns true.
1705 */
1706bool ipv6_chk_custom_prefix(const struct in6_addr *addr,
1707 const unsigned int prefix_len, struct net_device *dev)
1708{
1709 struct inet6_dev *idev;
1710 struct inet6_ifaddr *ifa;
1711 bool ret = false;
1712
1713 rcu_read_lock();
1714 idev = __in6_dev_get(dev);
1715 if (idev) {
1716 read_lock_bh(&idev->lock);
1717 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1718 ret = ipv6_prefix_equal(addr, &ifa->addr, prefix_len);
1719 if (ret)
1720 break;
1721 }
1722 read_unlock_bh(&idev->lock);
1723 }
1724 rcu_read_unlock();
1725
1726 return ret;
1727}
1728EXPORT_SYMBOL(ipv6_chk_custom_prefix);
1729
b71d1d42 1730int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev)
52eeeb84
YH		 1731{
1732 struct inet6_dev *idev;
1733 struct inet6_ifaddr *ifa;
1734 int onlink;
1735
1736 onlink = 0;
1737 rcu_read_lock();
1738 idev = __in6_dev_get(dev);
1739 if (idev) {
1740 read_lock_bh(&idev->lock);
502a2ffd 1741 list_for_each_entry(ifa, &idev->addr_list, if_list) {
52eeeb84
YH		 1742 onlink = ipv6_prefix_equal(addr, &ifa->addr,
1743 ifa->prefix_len);
1744 if (onlink)
1745 break;
1746 }
1747 read_unlock_bh(&idev->lock);
1748 }
1749 rcu_read_unlock();
1750 return onlink;
1751}
52eeeb84
YH		 1752EXPORT_SYMBOL(ipv6_chk_prefix);
1753
9acd9f3a 1754struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1cab3da6 1755 struct net_device *dev, int strict)
1da177e4 1756{
b79d1d54 1757 struct inet6_ifaddr *ifp, *result = NULL;
ddbe5032 1758 unsigned int hash = inet6_addr_hash(addr);
1da177e4 1759
5c578aed 1760 rcu_read_lock_bh();
b67bfe0d 1761 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
878628fb 1762 if (!net_eq(dev_net(ifp->idev->dev), net))
1cab3da6 1763 continue;
1da177e4 1764 if (ipv6_addr_equal(&ifp->addr, addr)) {
63159f29 1765 if (!dev || ifp->idev->dev == dev ||
1da177e4 1766 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
b79d1d54 1767 result = ifp;
1da177e4
LT		 1768 in6_ifa_hold(ifp);
1769 break;
1770 }
1771 }
1772 }
5c578aed 1773 rcu_read_unlock_bh();
1da177e4 1774
b79d1d54 1775 return result;
1da177e4
LT		 1776}
1777
1da177e4
LT		 1778/* Gets referenced address, destroys ifaddr */
1779
cc411d0b 1780static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
1da177e4 1781{
3d171f39
LR		 1782 if (dad_failed)
1783 ifp->flags |= IFA_F_DADFAILED;
1784
1da177e4
LT		 1785 if (ifp->flags&IFA_F_PERMANENT) {
1786 spin_lock_bh(&ifp->lock);
c15b1cca 1787 addrconf_del_dad_work(ifp);
1da177e4
LT		 1788 ifp->flags |= IFA_F_TENTATIVE;
1789 spin_unlock_bh(&ifp->lock);
e2577a06
HX		 1790 if (dad_failed)
1791 ipv6_ifa_notify(0, ifp);
1da177e4 1792 in6_ifa_put(ifp);
1da177e4
LT		 1793 } else if (ifp->flags&IFA_F_TEMPORARY) {
1794 struct inet6_ifaddr *ifpub;
1795 spin_lock_bh(&ifp->lock);
1796 ifpub = ifp->ifpub;
1797 if (ifpub) {
1798 in6_ifa_hold(ifpub);
1799 spin_unlock_bh(&ifp->lock);
1800 ipv6_create_tempaddr(ifpub, ifp);
1801 in6_ifa_put(ifpub);
1802 } else {
1803 spin_unlock_bh(&ifp->lock);
1804 }
1805 ipv6_del_addr(ifp);
c15b1cca 1806 } else {
1da177e4 1807 ipv6_del_addr(ifp);
c15b1cca 1808 }
1da177e4
LT		 1809}
1810
f2344a13
HX		 1811static int addrconf_dad_end(struct inet6_ifaddr *ifp)
1812{
1813 int err = -ENOENT;
1814
8e8e676d 1815 spin_lock_bh(&ifp->lock);
f2344a13
HX		 1816 if (ifp->state == INET6_IFADDR_STATE_DAD) {
1817 ifp->state = INET6_IFADDR_STATE_POSTDAD;
1818 err = 0;
1819 }
8e8e676d 1820 spin_unlock_bh(&ifp->lock);
f2344a13
HX		 1821
1822 return err;
1823}
1824
3c21edbd
YH		 1825void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1826{
5f40ef77 1827 struct in6_addr addr;
1b34be74 1828 struct inet6_dev *idev = ifp->idev;
1855b7c3 1829 struct net *net = dev_net(ifp->idev->dev);
9bdd8d40 1830
853dc2e0
UB		 1831 if (addrconf_dad_end(ifp)) {
1832 in6_ifa_put(ifp);
f2344a13 1833 return;
853dc2e0 1834 }
f2344a13 1835
e87cc472
JP		 1836 net_info_ratelimited("%s: IPv6 duplicate address %pI6c detected!\n",
1837 ifp->idev->dev->name, &ifp->addr);
9bdd8d40 1838
5f40ef77
HFS		 1839 spin_lock_bh(&ifp->lock);
1840
1841 if (ifp->flags & IFA_F_STABLE_PRIVACY) {
1842 int scope = ifp->scope;
1843 u32 flags = ifp->flags;
1844 struct in6_addr new_addr;
1845 struct inet6_ifaddr *ifp2;
1846 u32 valid_lft, preferred_lft;
1847 int pfxlen = ifp->prefix_len;
5f40ef77
HFS		 1848 int retries = ifp->stable_privacy_retry + 1;
1849
1855b7c3 1850 if (retries > net->ipv6.sysctl.idgen_retries) {
5f40ef77
HFS		 1851 net_info_ratelimited("%s: privacy stable address generation failed because of DAD conflicts!\n",
1852 ifp->idev->dev->name);
1853 goto errdad;
1854 }
1855
1856 new_addr = ifp->addr;
1857 if (ipv6_generate_stable_address(&new_addr, retries,
1858 idev))
1859 goto errdad;
1860
1861 valid_lft = ifp->valid_lft;
1862 preferred_lft = ifp->prefered_lft;
1863
1864 spin_unlock_bh(&ifp->lock);
1b34be74 1865
5f40ef77
HFS		 1866 if (idev->cnf.max_addresses &&
1867 ipv6_count_addresses(idev) >=
1868 idev->cnf.max_addresses)
1869 goto lock_errdad;
1870
1871 net_info_ratelimited("%s: generating new stable privacy address because of DAD conflict\n",
1872 ifp->idev->dev->name);
1873
1874 ifp2 = ipv6_add_addr(idev, &new_addr, NULL, pfxlen,
1875 scope, flags, valid_lft,
1876 preferred_lft);
1877 if (IS_ERR(ifp2))
1878 goto lock_errdad;
1879
1880 spin_lock_bh(&ifp2->lock);
1881 ifp2->stable_privacy_retry = retries;
1882 ifp2->state = INET6_IFADDR_STATE_PREDAD;
1883 spin_unlock_bh(&ifp2->lock);
1884
1855b7c3 1885 addrconf_mod_dad_work(ifp2, net->ipv6.sysctl.idgen_delay);
5f40ef77
HFS		 1886 in6_ifa_put(ifp2);
1887lock_errdad:
1888 spin_lock_bh(&ifp->lock);
1889 } else if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6) {
1b34be74
YH		 1890 addr.s6_addr32[0] = htonl(0xfe800000);
1891 addr.s6_addr32[1] = 0;
1892
1893 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
1894 ipv6_addr_equal(&ifp->addr, &addr)) {
1895 /* DAD failed for link-local based on MAC address */
1896 idev->cnf.disable_ipv6 = 1;
9bdd8d40 1897
f3213831 1898 pr_info("%s: IPv6 being disabled!\n",
9bdd8d40 1899 ifp->idev->dev->name);
1b34be74
YH		 1900 }
1901 }
1902
5f40ef77 1903errdad:
c15b1cca
HFS		 1904 /* transition from _POSTDAD to _ERRDAD */
1905 ifp->state = INET6_IFADDR_STATE_ERRDAD;
8e8e676d 1906 spin_unlock_bh(&ifp->lock);
c15b1cca
HFS		 1907
1908 addrconf_mod_dad_work(ifp, 0);
3c21edbd 1909}
1da177e4 1910
a9ed4a29
SD		 1911/* Join to solicited addr multicast group.
1912 * caller must hold RTNL */
b71d1d42 1913void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr)
1da177e4
LT		 1914{
1915 struct in6_addr maddr;
1916
1917 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1918 return;
1919
1920 addrconf_addr_solict_mult(addr, &maddr);
1921 ipv6_dev_mc_inc(dev, &maddr);
1922}
1923
a9ed4a29 1924/* caller must hold RTNL */
b71d1d42 1925void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr)
1da177e4
LT		 1926{
1927 struct in6_addr maddr;
1928
1929 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1930 return;
1931
1932 addrconf_addr_solict_mult(addr, &maddr);
1933 __ipv6_dev_mc_dec(idev, &maddr);
1934}
1935
a9ed4a29 1936/* caller must hold RTNL */
20380731 1937static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1da177e4
LT		 1938{
1939 struct in6_addr addr;
c15b1cca 1940
88ad3149 1941 if (ifp->prefix_len >= 127) /* RFC 6164 */
2bda8a0c 1942 return;
1da177e4
LT		 1943 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1944 if (ipv6_addr_any(&addr))
1945 return;
013b4d90 1946 __ipv6_dev_ac_inc(ifp->idev, &addr);
1da177e4
LT		 1947}
1948
a9ed4a29 1949/* caller must hold RTNL */
20380731 1950static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1da177e4
LT		 1951{
1952 struct in6_addr addr;
c15b1cca 1953
88ad3149 1954 if (ifp->prefix_len >= 127) /* RFC 6164 */
32019e65 1955 return;
1da177e4
LT		 1956 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1957 if (ipv6_addr_any(&addr))
1958 return;
1959 __ipv6_dev_ac_dec(ifp->idev, &addr);
1960}
1961
06a4c1c5 1962static int addrconf_ifid_eui64(u8 *eui, struct net_device *dev)
1963{
5241c2d7 1964 if (dev->addr_len != EUI64_ADDR_LEN)
06a4c1c5 1965 return -1;
5241c2d7 1966 memcpy(eui, dev->dev_addr, EUI64_ADDR_LEN);
5e98a36e 1967 eui[0] ^= 2;
06a4c1c5 1968 return 0;
1969}
1970
cb6bf355
YH		 1971static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev)
1972{
1973 union fwnet_hwaddr *ha;
1974
1975 if (dev->addr_len != FWNET_ALEN)
1976 return -1;
1977
1978 ha = (union fwnet_hwaddr *)dev->dev_addr;
1979
1980 memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id));
1981 eui[0] ^= 2;
1982 return 0;
1983}
1984
073a8e0e
YH		 1985static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1986{
1987 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1988 if (dev->addr_len != ARCNET_ALEN)
1989 return -1;
1990 memset(eui, 0, 7);
8e5e8f30 1991 eui[7] = *(u8 *)dev->dev_addr;
073a8e0e
YH		 1992 return 0;
1993}
1994
1995static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1996{
1997 if (dev->addr_len != INFINIBAND_ALEN)
1998 return -1;
1999 memcpy(eui, dev->dev_addr + 12, 8);
2000 eui[0] |= 2;
2001 return 0;
2002}
2003
c61393ea 2004static int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
dfd982ba 2005{
9af28511
SH		 2006 if (addr == 0)
2007 return -1;
dfd982ba
YH		 2008 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
2009 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
2010 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
2011 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
2012 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
2013 ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
2014 eui[1] = 0;
2015 eui[2] = 0x5E;
2016 eui[3] = 0xFE;
2017 memcpy(eui + 4, &addr, 4);
2018 return 0;
2019}
dfd982ba
YH		 2020
2021static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
2022{
2023 if (dev->priv_flags & IFF_ISATAP)
2024 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
2025 return -1;
2026}
2027
aee80b54 2028static int addrconf_ifid_gre(u8 *eui, struct net_device *dev)
2029{
2030 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
2031}
2032
e837735e
ND		 2033static int addrconf_ifid_ip6tnl(u8 *eui, struct net_device *dev)
2034{
2035 memcpy(eui, dev->perm_addr, 3);
2036 memcpy(eui + 5, dev->perm_addr + 3, 3);
2037 eui[3] = 0xFF;
2038 eui[4] = 0xFE;
2039 eui[0] ^= 2;
2040 return 0;
2041}
2042
1da177e4
LT		 2043static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
2044{
2045 switch (dev->type) {
2046 case ARPHRD_ETHER:
2047 case ARPHRD_FDDI:
073a8e0e 2048 return addrconf_ifid_eui48(eui, dev);
1da177e4 2049 case ARPHRD_ARCNET:
073a8e0e 2050 return addrconf_ifid_arcnet(eui, dev);
1da177e4 2051 case ARPHRD_INFINIBAND:
073a8e0e 2052 return addrconf_ifid_infiniband(eui, dev);
c7dc89c0 2053 case ARPHRD_SIT:
dfd982ba 2054 return addrconf_ifid_sit(eui, dev);
aee80b54 2055 case ARPHRD_IPGRE:
2056 return addrconf_ifid_gre(eui, dev);
e74bccb8 2057 case ARPHRD_6LOWPAN:
06a4c1c5 2058 return addrconf_ifid_eui64(eui, dev);
cb6bf355
YH		 2059 case ARPHRD_IEEE1394:
2060 return addrconf_ifid_ieee1394(eui, dev);
e837735e
ND		 2061 case ARPHRD_TUNNEL6:
2062 return addrconf_ifid_ip6tnl(eui, dev);
1da177e4
LT		 2063 }
2064 return -1;
2065}
2066
2067static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
2068{
2069 int err = -1;
2070 struct inet6_ifaddr *ifp;
2071
2072 read_lock_bh(&idev->lock);
602582ca
HFS		 2073 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
2074 if (ifp->scope > IFA_LINK)
2075 break;
1da177e4
LT		 2076 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
2077 memcpy(eui, ifp->addr.s6_addr+8, 8);
2078 err = 0;
2079 break;
2080 }
2081 }
2082 read_unlock_bh(&idev->lock);
2083 return err;
2084}
2085
1da177e4 2086/* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
eb7e0575 2087static void __ipv6_regen_rndid(struct inet6_dev *idev)
1da177e4 2088{
1da177e4 2089regen:
955189ef 2090 get_random_bytes(idev->rndid, sizeof(idev->rndid));
1da177e4 2091 idev->rndid[0] &= ~0x02;
1da177e4
LT		 2092
2093 /*
2094 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
2095 * check if generated address is not inappropriate
2096 *
2097 * - Reserved subnet anycast (RFC 2526)
2098 * 11111101 11....11 1xxxxxxx
c7dc89c0 2099 * - ISATAP (RFC4214) 6.1
1da177e4
LT		 2100 * 00-00-5E-FE-xx-xx-xx-xx
2101 * - value 0
2102 * - XXX: already assigned to an address on the device
2103 */
1ab1457c 2104 if (idev->rndid[0] == 0xfd &&
1da177e4
LT		 2105 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
2106 (idev->rndid[7]&0x80))
2107 goto regen;
2108 if ((idev->rndid[0]|idev->rndid[1]) == 0) {
2109 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
2110 goto regen;
2111 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
2112 goto regen;
2113 }
1da177e4
LT		 2114}
2115
2116static void ipv6_regen_rndid(unsigned long data)
2117{
2118 struct inet6_dev *idev = (struct inet6_dev *) data;
2119 unsigned long expires;
2120
8814c4b5 2121 rcu_read_lock_bh();
1da177e4
LT		 2122 write_lock_bh(&idev->lock);
2123
2124 if (idev->dead)
2125 goto out;
2126
eb7e0575 2127 __ipv6_regen_rndid(idev);
1ab1457c 2128
1da177e4 2129 expires = jiffies +
1ab1457c 2130 idev->cnf.temp_prefered_lft * HZ -
1f9248e5
JP		 2131 idev->cnf.regen_max_retry * idev->cnf.dad_transmits *
2132 NEIGH_VAR(idev->nd_parms, RETRANS_TIME) -
784e2710 2133 idev->cnf.max_desync_factor * HZ;
1da177e4 2134 if (time_before(expires, jiffies)) {
f3213831
JP		 2135 pr_warn("%s: too short regeneration interval; timer disabled for %s\n",
2136 __func__, idev->dev->name);
1da177e4
LT		 2137 goto out;
2138 }
2139
2140 if (!mod_timer(&idev->regen_timer, expires))
2141 in6_dev_hold(idev);
2142
2143out:
2144 write_unlock_bh(&idev->lock);
8814c4b5 2145 rcu_read_unlock_bh();
1da177e4
LT		 2146 in6_dev_put(idev);
2147}
2148
eb7e0575 2149static void __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr)
8e5e8f30 2150{
1da177e4 2151 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
eb7e0575 2152 __ipv6_regen_rndid(idev);
1da177e4 2153}
1da177e4
LT		 2154
2155/*
2156 * Add prefix route.
2157 */
2158
2159static void
2160addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
e431b8c0 2161 unsigned long expires, u32 flags)
1da177e4 2162{
86872cb5 2163 struct fib6_config cfg = {
ca254490 2164 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX,
86872cb5
TG		 2165 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2166 .fc_ifindex = dev->ifindex,
2167 .fc_expires = expires,
2168 .fc_dst_len = plen,
2169 .fc_flags = RTF_UP | flags,
c346dca1 2170 .fc_nlinfo.nl_net = dev_net(dev),
f410a1fb 2171 .fc_protocol = RTPROT_KERNEL,
86872cb5 2172 };
1da177e4 2173
4e3fd7a0 2174 cfg.fc_dst = *pfx;
1da177e4
LT		 2175
2176 /* Prevent useless cloning on PtP SIT.
2177 This thing is done here expecting that the whole
2178 class of non-broadcast devices need not cloning.
2179 */
07a93626 2180#if IS_ENABLED(CONFIG_IPV6_SIT)
86872cb5
TG		 2181 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
2182 cfg.fc_flags |= RTF_NONEXTHOP;
0be669bb 2183#endif
1da177e4 2184
86872cb5 2185 ip6_route_add(&cfg);
1da177e4
LT		 2186}
2187
14ef37b6
AH		 2188
2189static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
2190 int plen,
2191 const struct net_device *dev,
2192 u32 flags, u32 noflags)
2193{
2194 struct fib6_node *fn;
2195 struct rt6_info *rt = NULL;
2196 struct fib6_table *table;
ca254490 2197 u32 tb_id = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX;
14ef37b6 2198
ca254490 2199 table = fib6_get_table(dev_net(dev), tb_id);
63159f29 2200 if (!table)
14ef37b6
AH		 2201 return NULL;
2202
5744dd9b 2203 read_lock_bh(&table->tb6_lock);
14ef37b6
AH		 2204 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0);
2205 if (!fn)
2206 goto out;
1f56a01f
MKL		 2207
2208 noflags |= RTF_CACHE;
14ef37b6 2209 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
d1918542 2210 if (rt->dst.dev->ifindex != dev->ifindex)
14ef37b6
AH		 2211 continue;
2212 if ((rt->rt6i_flags & flags) != flags)
2213 continue;
85da53bf 2214 if ((rt->rt6i_flags & noflags) != 0)
14ef37b6
AH		 2215 continue;
2216 dst_hold(&rt->dst);
2217 break;
2218 }
2219out:
5744dd9b 2220 read_unlock_bh(&table->tb6_lock);
14ef37b6
AH		 2221 return rt;
2222}
2223
2224
1da177e4
LT		 2225/* Create "default" multicast route to the interface */
2226
2227static void addrconf_add_mroute(struct net_device *dev)
2228{
86872cb5 2229 struct fib6_config cfg = {
ca254490 2230 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_LOCAL,
86872cb5
TG		 2231 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2232 .fc_ifindex = dev->ifindex,
2233 .fc_dst_len = 8,
2234 .fc_flags = RTF_UP,
c346dca1 2235 .fc_nlinfo.nl_net = dev_net(dev),
86872cb5
TG		 2236 };
2237
2238 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
2239
2240 ip6_route_add(&cfg);
1da177e4
LT		 2241}
2242
1da177e4
LT		 2243static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
2244{
2245 struct inet6_dev *idev;
2246
2247 ASSERT_RTNL();
2248
e21e8467
SH		 2249 idev = ipv6_find_idev(dev);
2250 if (!idev)
64e724f6
BH		 2251 return ERR_PTR(-ENOBUFS);
2252
2253 if (idev->cnf.disable_ipv6)
2254 return ERR_PTR(-EACCES);
1da177e4
LT		 2255
2256 /* Add default multicast route */
ba46ee4c 2257 if (!(dev->flags & IFF_LOOPBACK) && !netif_is_l3_master(dev))
4af04aba 2258 addrconf_add_mroute(dev);
1da177e4 2259
1da177e4
LT		 2260 return idev;
2261}
2262
53bd6749
JP		 2263static void manage_tempaddrs(struct inet6_dev *idev,
2264 struct inet6_ifaddr *ifp,
2265 __u32 valid_lft, __u32 prefered_lft,
2266 bool create, unsigned long now)
2267{
2268 u32 flags;
2269 struct inet6_ifaddr *ift;
2270
2271 read_lock_bh(&idev->lock);
2272 /* update all temporary addresses in the list */
2273 list_for_each_entry(ift, &idev->tempaddr_list, tmp_list) {
2274 int age, max_valid, max_prefered;
2275
2276 if (ifp != ift->ifpub)
2277 continue;
2278
2279 /* RFC 4941 section 3.3:
2280 * If a received option will extend the lifetime of a public
2281 * address, the lifetimes of temporary addresses should
2282 * be extended, subject to the overall constraint that no
2283 * temporary addresses should ever remain "valid" or "preferred"
2284 * for a time longer than (TEMP_VALID_LIFETIME) or
2285 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), respectively.
2286 */
2287 age = (now - ift->cstamp) / HZ;
2288 max_valid = idev->cnf.temp_valid_lft - age;
2289 if (max_valid < 0)
2290 max_valid = 0;
2291
2292 max_prefered = idev->cnf.temp_prefered_lft -
2293 idev->cnf.max_desync_factor - age;
2294 if (max_prefered < 0)
2295 max_prefered = 0;
2296
2297 if (valid_lft > max_valid)
2298 valid_lft = max_valid;
2299
2300 if (prefered_lft > max_prefered)
2301 prefered_lft = max_prefered;
2302
2303 spin_lock(&ift->lock);
2304 flags = ift->flags;
2305 ift->valid_lft = valid_lft;
2306 ift->prefered_lft = prefered_lft;
2307 ift->tstamp = now;
2308 if (prefered_lft > 0)
2309 ift->flags &= ~IFA_F_DEPRECATED;
2310
2311 spin_unlock(&ift->lock);
2312 if (!(flags&IFA_F_TENTATIVE))
2313 ipv6_ifa_notify(0, ift);
2314 }
2315
2316 if ((create || list_empty(&idev->tempaddr_list)) &&
2317 idev->cnf.use_tempaddr > 0) {
2318 /* When a new public address is created as described
2319 * in [ADDRCONF], also create a new temporary address.
2320 * Also create a temporary address if it's enabled but
2321 * no temporary address currently exists.
2322 */
2323 read_unlock_bh(&idev->lock);
2324 ipv6_create_tempaddr(ifp, NULL);
2325 } else {
2326 read_unlock_bh(&idev->lock);
2327 }
2328}
2329
cc9da6cc
BM		 2330static bool is_addr_mode_generate_stable(struct inet6_dev *idev)
2331{
2332 return idev->addr_gen_mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY ||
2333 idev->addr_gen_mode == IN6_ADDR_GEN_MODE_RANDOM;
2334}
2335
e6bff995 2336void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao)
1da177e4
LT		 2337{
2338 struct prefix_info *pinfo;
2339 __u32 valid_lft;
2340 __u32 prefered_lft;
2341 int addr_type;
64236f3f 2342 u32 addr_flags = 0;
1da177e4 2343 struct inet6_dev *in6_dev;
56d417b1 2344 struct net *net = dev_net(dev);
1da177e4
LT		 2345
2346 pinfo = (struct prefix_info *) opt;
1ab1457c 2347
1da177e4 2348 if (len < sizeof(struct prefix_info)) {
ba3542e1 2349 ADBG("addrconf: prefix option too short\n");
1da177e4
LT		 2350 return;
2351 }
1ab1457c 2352
1da177e4
LT		 2353 /*
2354 * Validation checks ([ADDRCONF], page 19)
2355 */
2356
2357 addr_type = ipv6_addr_type(&pinfo->prefix);
2358
2359 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
2360 return;
2361
2362 valid_lft = ntohl(pinfo->valid);
2363 prefered_lft = ntohl(pinfo->prefered);
2364
2365 if (prefered_lft > valid_lft) {
e87cc472 2366 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n");
1da177e4
LT		 2367 return;
2368 }
2369
2370 in6_dev = in6_dev_get(dev);
2371
63159f29 2372 if (!in6_dev) {
e87cc472
JP		 2373 net_dbg_ratelimited("addrconf: device %s not configured\n",
2374 dev->name);
1da177e4
LT		 2375 return;
2376 }
2377
2378 /*
2379 * Two things going on here:
2380 * 1) Add routes for on-link prefixes
2381 * 2) Configure prefixes with the auto flag set
2382 */
2383
4bed72e4
YH		 2384 if (pinfo->onlink) {
2385 struct rt6_info *rt;
2386 unsigned long rt_expires;
2387
6f704992
YH		 2388 /* Avoid arithmetic overflow. Really, we could
2389 * save rt_expires in seconds, likely valid_lft,
2390 * but it would require division in fib gc, that it
2391 * not good.
2392 */
4bed72e4
YH		 2393 if (HZ > USER_HZ)
2394 rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
2395 else
2396 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
3dd4bc68 2397
4bed72e4
YH		 2398 if (addrconf_finite_timeout(rt_expires))
2399 rt_expires *= HZ;
1da177e4 2400
14ef37b6
AH		 2401 rt = addrconf_get_prefix_route(&pinfo->prefix,
2402 pinfo->prefix_len,
2403 dev,
2404 RTF_ADDRCONF | RTF_PREFIX_RT,
2405 RTF_GATEWAY | RTF_DEFAULT);
1da177e4 2406
14ef37b6 2407 if (rt) {
6f704992
YH		 2408 /* Autoconf prefix route */
2409 if (valid_lft == 0) {
2410 ip6_del_rt(rt);
2411 rt = NULL;
4bed72e4 2412 } else if (addrconf_finite_timeout(rt_expires)) {
6f704992 2413 /* not infinity */
1716a961 2414 rt6_set_expires(rt, jiffies + rt_expires);
6f704992 2415 } else {
1716a961 2416 rt6_clean_expires(rt);
1da177e4
LT		 2417 }
2418 } else if (valid_lft) {
6f704992 2419 clock_t expires = 0;
4bed72e4
YH		 2420 int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
2421 if (addrconf_finite_timeout(rt_expires)) {
6f704992
YH		 2422 /* not infinity */
2423 flags |= RTF_EXPIRES;
2424 expires = jiffies_to_clock_t(rt_expires);
2425 }
1da177e4 2426 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
6f704992 2427 dev, expires, flags);
1da177e4 2428 }
94e187c0 2429 ip6_rt_put(rt);
1da177e4
LT		 2430 }
2431
2432 /* Try to figure out our local address for this prefix */
2433
2434 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
8e5e8f30 2435 struct inet6_ifaddr *ifp;
1da177e4
LT		 2436 struct in6_addr addr;
2437 int create = 0, update_lft = 0;
617fe29d 2438 bool tokenized = false;
1da177e4
LT		 2439
2440 if (pinfo->prefix_len == 64) {
2441 memcpy(&addr, &pinfo->prefix, 8);
f53adae4
DB		 2442
2443 if (!ipv6_addr_any(&in6_dev->token)) {
2444 read_lock_bh(&in6_dev->lock);
2445 memcpy(addr.s6_addr + 8,
2446 in6_dev->token.s6_addr + 8, 8);
2447 read_unlock_bh(&in6_dev->lock);
617fe29d 2448 tokenized = true;
cc9da6cc 2449 } else if (is_addr_mode_generate_stable(in6_dev) &&
622c81d5
HFS		 2450 !ipv6_generate_stable_address(&addr, 0,
2451 in6_dev)) {
64236f3f 2452 addr_flags |= IFA_F_STABLE_PRIVACY;
622c81d5 2453 goto ok;
f53adae4
DB		 2454 } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
2455 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
1da177e4
LT		 2456 in6_dev_put(in6_dev);
2457 return;
2458 }
2459 goto ok;
2460 }
e87cc472
JP		 2461 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n",
2462 pinfo->prefix_len);
1da177e4
LT		 2463 in6_dev_put(in6_dev);
2464 return;
2465
2466ok:
2467
53b7997f 2468 ifp = ipv6_get_ifaddr(net, &addr, dev, 1);
1da177e4 2469
63159f29 2470 if (!ifp && valid_lft) {
1da177e4 2471 int max_addresses = in6_dev->cnf.max_addresses;
95c385b4
NH		 2472
2473#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2474 if (in6_dev->cnf.optimistic_dad &&
e6bff995 2475 !net->ipv6.devconf_all->forwarding && sllao)
9a1ec461 2476 addr_flags |= IFA_F_OPTIMISTIC;
95c385b4 2477#endif
1da177e4
LT		 2478
2479 /* Do not allow to create too much of autoconfigured
2480 * addresses; this would be too easy way to crash kernel.
2481 */
2482 if (!max_addresses ||
2483 ipv6_count_addresses(in6_dev) < max_addresses)
3f8f5298
JP		 2484 ifp = ipv6_add_addr(in6_dev, &addr, NULL,
2485 pinfo->prefix_len,
95c385b4 2486 addr_type&IPV6_ADDR_SCOPE_MASK,
8a226b2c
JB		 2487 addr_flags, valid_lft,
2488 prefered_lft);
1da177e4 2489
3f0d2ba0 2490 if (IS_ERR_OR_NULL(ifp)) {
1da177e4
LT		 2491 in6_dev_put(in6_dev);
2492 return;
2493 }
2494
8a226b2c
JB		 2495 update_lft = 0;
2496 create = 1;
c15b1cca
HFS		 2497 spin_lock_bh(&ifp->lock);
2498 ifp->flags |= IFA_F_MANAGETEMPADDR;
1da177e4 2499 ifp->cstamp = jiffies;
617fe29d 2500 ifp->tokenized = tokenized;
c15b1cca 2501 spin_unlock_bh(&ifp->lock);
cf22f9a2 2502 addrconf_dad_start(ifp);
1da177e4
LT		 2503 }
2504
2505 if (ifp) {
479840ff 2506 u32 flags;
1da177e4 2507 unsigned long now;
1da177e4
LT		 2508 u32 stored_lft;
2509
2510 /* update lifetime (RFC2462 5.5.3 e) */
8e8e676d 2511 spin_lock_bh(&ifp->lock);
1da177e4
LT		 2512 now = jiffies;
2513 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
2514 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
2515 else
2516 stored_lft = 0;
8a226b2c 2517 if (!update_lft && !create && stored_lft) {
9451a304
FF		 2518 const u32 minimum_lft = min_t(u32,
2519 stored_lft, MIN_VALID_LIFETIME);
c9d55d5b
PM		 2520 valid_lft = max(valid_lft, minimum_lft);
2521
2522 /* RFC4862 Section 5.5.3e:
2523 * "Note that the preferred lifetime of the
2524 * corresponding address is always reset to
2525 * the Preferred Lifetime in the received
2526 * Prefix Information option, regardless of
2527 * whether the valid lifetime is also reset or
2528 * ignored."
2529 *
2530 * So we should always update prefered_lft here.
2531 */
2532 update_lft = 1;
1da177e4
LT		 2533 }
2534
2535 if (update_lft) {
2536 ifp->valid_lft = valid_lft;
2537 ifp->prefered_lft = prefered_lft;
2538 ifp->tstamp = now;
2539 flags = ifp->flags;
2540 ifp->flags &= ~IFA_F_DEPRECATED;
8e8e676d 2541 spin_unlock_bh(&ifp->lock);
1da177e4
LT		 2542
2543 if (!(flags&IFA_F_TENTATIVE))
2544 ipv6_ifa_notify(0, ifp);
2545 } else
8e8e676d 2546 spin_unlock_bh(&ifp->lock);
1da177e4 2547
53bd6749
JP		 2548 manage_tempaddrs(in6_dev, ifp, valid_lft, prefered_lft,
2549 create, now);
5d9efa7e 2550
1da177e4 2551 in6_ifa_put(ifp);
c15b1cca 2552 addrconf_verify();
1da177e4
LT		 2553 }
2554 }
2555 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
2556 in6_dev_put(in6_dev);
2557}
2558
2559/*
2560 * Set destination address.
2561 * Special case for SIT interfaces where we create a new "virtual"
2562 * device.
2563 */
af284937 2564int addrconf_set_dstaddr(struct net *net, void __user *arg)
1da177e4
LT		 2565{
2566 struct in6_ifreq ireq;
2567 struct net_device *dev;
2568 int err = -EINVAL;
2569
2570 rtnl_lock();
2571
2572 err = -EFAULT;
2573 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2574 goto err_exit;
2575
af284937 2576 dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
1da177e4
LT		 2577
2578 err = -ENODEV;
63159f29 2579 if (!dev)
1da177e4
LT		 2580 goto err_exit;
2581
07a93626 2582#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4 2583 if (dev->type == ARPHRD_SIT) {
5bc3eb7e 2584 const struct net_device_ops *ops = dev->netdev_ops;
1da177e4 2585 struct ifreq ifr;
1da177e4
LT		 2586 struct ip_tunnel_parm p;
2587
2588 err = -EADDRNOTAVAIL;
2589 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2590 goto err_exit;
2591
2592 memset(&p, 0, sizeof(p));
2593 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2594 p.iph.saddr = 0;
2595 p.iph.version = 4;
2596 p.iph.ihl = 5;
2597 p.iph.protocol = IPPROTO_IPV6;
2598 p.iph.ttl = 64;
d20b3109 2599 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
1da177e4 2600
5bc3eb7e
SH		 2601 if (ops->ndo_do_ioctl) {
2602 mm_segment_t oldfs = get_fs();
2603
2604 set_fs(KERNEL_DS);
2605 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2606 set_fs(oldfs);
2607 } else
2608 err = -EOPNOTSUPP;
1da177e4
LT		 2609
2610 if (err == 0) {
2611 err = -ENOBUFS;
af284937
DL		 2612 dev = __dev_get_by_name(net, p.name);
2613 if (!dev)
1da177e4
LT		 2614 goto err_exit;
2615 err = dev_open(dev);
2616 }
2617 }
0be669bb 2618#endif
1da177e4
LT		 2619
2620err_exit:
2621 rtnl_unlock();
2622 return err;
2623}
2624
93a714d6
MC		 2625static int ipv6_mc_config(struct sock *sk, bool join,
2626 const struct in6_addr *addr, int ifindex)
2627{
2628 int ret;
2629
2630 ASSERT_RTNL();
2631
2632 lock_sock(sk);
2633 if (join)
54ff9ef3 2634 ret = ipv6_sock_mc_join(sk, ifindex, addr);
93a714d6 2635 else
54ff9ef3 2636 ret = ipv6_sock_mc_drop(sk, ifindex, addr);
93a714d6
MC		 2637 release_sock(sk);
2638
2639 return ret;
2640}
2641
1da177e4
LT		 2642/*
2643 * Manual configuration of address on an interface
2644 */
479840ff
JP		 2645static int inet6_addr_add(struct net *net, int ifindex,
2646 const struct in6_addr *pfx,
caeaba79 2647 const struct in6_addr *peer_pfx,
479840ff
JP		 2648 unsigned int plen, __u32 ifa_flags,
2649 __u32 prefered_lft, __u32 valid_lft)
1da177e4
LT		 2650{
2651 struct inet6_ifaddr *ifp;
2652 struct inet6_dev *idev;
2653 struct net_device *dev;
93a714d6
MC		 2654 unsigned long timeout;
2655 clock_t expires;
1da177e4 2656 int scope;
6f704992 2657 u32 flags;
1da177e4
LT		 2658
2659 ASSERT_RTNL();
1ab1457c 2660
24ef0da7
TG		 2661 if (plen > 128)
2662 return -EINVAL;
2663
0778769d
NT		 2664 /* check the lifetime */
2665 if (!valid_lft || prefered_lft > valid_lft)
2666 return -EINVAL;
2667
53bd6749
JP		 2668 if (ifa_flags & IFA_F_MANAGETEMPADDR && plen != 64)
2669 return -EINVAL;
2670
af284937
DL		 2671 dev = __dev_get_by_index(net, ifindex);
2672 if (!dev)
1da177e4 2673 return -ENODEV;
1ab1457c 2674
64e724f6
BH		 2675 idev = addrconf_add_dev(dev);
2676 if (IS_ERR(idev))
2677 return PTR_ERR(idev);
1da177e4 2678
93a714d6
MC		 2679 if (ifa_flags & IFA_F_MCAUTOJOIN) {
2680 int ret = ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2681 true, pfx, ifindex);
2682
2683 if (ret < 0)
2684 return ret;
2685 }
2686
1da177e4
LT		 2687 scope = ipv6_addr_scope(pfx);
2688
4bed72e4
YH		 2689 timeout = addrconf_timeout_fixup(valid_lft, HZ);
2690 if (addrconf_finite_timeout(timeout)) {
2691 expires = jiffies_to_clock_t(timeout * HZ);
2692 valid_lft = timeout;
6f704992 2693 flags = RTF_EXPIRES;
4bed72e4
YH		 2694 } else {
2695 expires = 0;
2696 flags = 0;
2697 ifa_flags |= IFA_F_PERMANENT;
6f704992 2698 }
0778769d 2699
4bed72e4
YH		 2700 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
2701 if (addrconf_finite_timeout(timeout)) {
2702 if (timeout == 0)
2703 ifa_flags |= IFA_F_DEPRECATED;
2704 prefered_lft = timeout;
2705 }
0778769d 2706
8a226b2c
JB		 2707 ifp = ipv6_add_addr(idev, pfx, peer_pfx, plen, scope, ifa_flags,
2708 valid_lft, prefered_lft);
0778769d 2709
1da177e4 2710 if (!IS_ERR(ifp)) {
761aac73
TH		 2711 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) {
2712 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
2713 expires, flags);
2714 }
2715
95c385b4
NH		 2716 /*
2717 * Note that section 3.1 of RFC 4429 indicates
2718 * that the Optimistic flag should not be set for
2719 * manually configured addresses
2720 */
cf22f9a2 2721 addrconf_dad_start(ifp);
53bd6749
JP		 2722 if (ifa_flags & IFA_F_MANAGETEMPADDR)
2723 manage_tempaddrs(idev, ifp, valid_lft, prefered_lft,
2724 true, jiffies);
1da177e4 2725 in6_ifa_put(ifp);
c15b1cca 2726 addrconf_verify_rtnl();
1da177e4 2727 return 0;
93a714d6
MC		 2728 } else if (ifa_flags & IFA_F_MCAUTOJOIN) {
2729 ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2730 false, pfx, ifindex);
1da177e4
LT		 2731 }
2732
2733 return PTR_ERR(ifp);
2734}
2735
6046d5b4
HK		 2736static int inet6_addr_del(struct net *net, int ifindex, u32 ifa_flags,
2737 const struct in6_addr *pfx, unsigned int plen)
1da177e4
LT		 2738{
2739 struct inet6_ifaddr *ifp;
2740 struct inet6_dev *idev;
2741 struct net_device *dev;
1ab1457c 2742
24ef0da7
TG		 2743 if (plen > 128)
2744 return -EINVAL;
2745
af284937
DL		 2746 dev = __dev_get_by_index(net, ifindex);
2747 if (!dev)
1da177e4
LT		 2748 return -ENODEV;
2749
e5d08d71 2750 idev = __in6_dev_get(dev);
63159f29 2751 if (!idev)
1da177e4
LT		 2752 return -ENXIO;
2753
2754 read_lock_bh(&idev->lock);
502a2ffd 2755 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1da177e4
LT		 2756 if (ifp->prefix_len == plen &&
2757 ipv6_addr_equal(pfx, &ifp->addr)) {
2758 in6_ifa_hold(ifp);
2759 read_unlock_bh(&idev->lock);
1ab1457c 2760
6046d5b4
HK		 2761 if (!(ifp->flags & IFA_F_TEMPORARY) &&
2762 (ifa_flags & IFA_F_MANAGETEMPADDR))
2763 manage_tempaddrs(idev, ifp, 0, 0, false,
2764 jiffies);
1da177e4 2765 ipv6_del_addr(ifp);
6046d5b4 2766 addrconf_verify_rtnl();
93a714d6
MC		 2767 if (ipv6_addr_is_multicast(pfx)) {
2768 ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2769 false, pfx, dev->ifindex);
2770 }
1da177e4
LT		 2771 return 0;
2772 }
2773 }
2774 read_unlock_bh(&idev->lock);
2775 return -EADDRNOTAVAIL;
2776}
2777
2778
af284937 2779int addrconf_add_ifaddr(struct net *net, void __user *arg)
1da177e4
LT		 2780{
2781 struct in6_ifreq ireq;
2782 int err;
1ab1457c 2783
af31f412 2784 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1da177e4 2785 return -EPERM;
1ab1457c 2786
1da177e4
LT		 2787 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2788 return -EFAULT;
2789
2790 rtnl_lock();
caeaba79 2791 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, NULL,
af284937
DL		 2792 ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2793 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
1da177e4
LT		 2794 rtnl_unlock();
2795 return err;
2796}
2797
af284937 2798int addrconf_del_ifaddr(struct net *net, void __user *arg)
1da177e4
LT		 2799{
2800 struct in6_ifreq ireq;
2801 int err;
1ab1457c 2802
af31f412 2803 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1da177e4
LT		 2804 return -EPERM;
2805
2806 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2807 return -EFAULT;
2808
2809 rtnl_lock();
6046d5b4 2810 err = inet6_addr_del(net, ireq.ifr6_ifindex, 0, &ireq.ifr6_addr,
af284937 2811 ireq.ifr6_prefixlen);
1da177e4
LT		 2812 rtnl_unlock();
2813 return err;
2814}
2815
b5f348e5
IJ		 2816static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
2817 int plen, int scope)
2818{
2819 struct inet6_ifaddr *ifp;
2820
8a226b2c 2821 ifp = ipv6_add_addr(idev, addr, NULL, plen,
07edd741
HFS		 2822 scope, IFA_F_PERMANENT,
2823 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
b5f348e5
IJ		 2824 if (!IS_ERR(ifp)) {
2825 spin_lock_bh(&ifp->lock);
2826 ifp->flags &= ~IFA_F_TENTATIVE;
2827 spin_unlock_bh(&ifp->lock);
2828 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2829 in6_ifa_put(ifp);
2830 }
2831}
2832
07a93626 2833#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4
LT		 2834static void sit_add_v4_addrs(struct inet6_dev *idev)
2835{
1da177e4
LT		 2836 struct in6_addr addr;
2837 struct net_device *dev;
c346dca1 2838 struct net *net = dev_net(idev->dev);
929c9cf3 2839 int scope, plen;
f0e2acfa 2840 u32 pflags = 0;
1da177e4
LT		 2841
2842 ASSERT_RTNL();
2843
2844 memset(&addr, 0, sizeof(struct in6_addr));
2845 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2846
2847 if (idev->dev->flags&IFF_POINTOPOINT) {
2848 addr.s6_addr32[0] = htonl(0xfe800000);
2849 scope = IFA_LINK;
929c9cf3 2850 plen = 64;
1da177e4
LT		 2851 } else {
2852 scope = IPV6_ADDR_COMPATv4;
929c9cf3 2853 plen = 96;
f0e2acfa 2854 pflags |= RTF_NONEXTHOP;
1da177e4
LT		 2855 }
2856
2857 if (addr.s6_addr32[3]) {
929c9cf3 2858 add_addr(idev, &addr, plen, scope);
f0e2acfa 2859 addrconf_prefix_route(&addr, plen, idev->dev, 0, pflags);
1da177e4
LT		 2860 return;
2861 }
2862
6fda7350 2863 for_each_netdev(net, dev) {
8e5e8f30 2864 struct in_device *in_dev = __in_dev_get_rtnl(dev);
1da177e4 2865 if (in_dev && (dev->flags & IFF_UP)) {
8e5e8f30 2866 struct in_ifaddr *ifa;
1da177e4
LT		 2867
2868 int flag = scope;
2869
2870 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
1da177e4
LT		 2871
2872 addr.s6_addr32[3] = ifa->ifa_local;
2873
2874 if (ifa->ifa_scope == RT_SCOPE_LINK)
2875 continue;
2876 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2877 if (idev->dev->flags&IFF_POINTOPOINT)
2878 continue;
2879 flag |= IFA_HOST;
2880 }
1da177e4 2881
b5f348e5 2882 add_addr(idev, &addr, plen, flag);
f0e2acfa
ND		 2883 addrconf_prefix_route(&addr, plen, idev->dev, 0,
2884 pflags);
1da177e4
LT		 2885 }
2886 }
1ab1457c 2887 }
1da177e4 2888}
0be669bb 2889#endif
1da177e4
LT		 2890
2891static void init_loopback(struct net_device *dev)
2892{
2893 struct inet6_dev *idev;
25fb6ca4
BK		 2894 struct net_device *sp_dev;
2895 struct inet6_ifaddr *sp_ifa;
2896 struct rt6_info *sp_rt;
1da177e4
LT		 2897
2898 /* ::1 */
2899
2900 ASSERT_RTNL();
2901
e5d08d71 2902 idev = ipv6_find_idev(dev);
63159f29 2903 if (!idev) {
91df42be 2904 pr_debug("%s: add_dev failed\n", __func__);
1da177e4
LT		 2905 return;
2906 }
2907
b5f348e5 2908 add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
25fb6ca4
BK		 2909
2910 /* Add routes to other interface's IPv6 addresses */
2911 for_each_netdev(dev_net(dev), sp_dev) {
2912 if (!strcmp(sp_dev->name, dev->name))
2913 continue;
2914
2915 idev = __in6_dev_get(sp_dev);
2916 if (!idev)
2917 continue;
2918
2919 read_lock_bh(&idev->lock);
2920 list_for_each_entry(sp_ifa, &idev->addr_list, if_list) {
2921
2922 if (sp_ifa->flags & (IFA_F_DADFAILED | IFA_F_TENTATIVE))
2923 continue;
2924
33d99113
G		 2925 if (sp_ifa->rt) {
2926 /* This dst has been added to garbage list when
2927 * lo device down, release this obsolete dst and
2928 * reallocate a new router for ifa.
2929 */
2930 if (sp_ifa->rt->dst.obsolete > 0) {
2931 ip6_rt_put(sp_ifa->rt);
2932 sp_ifa->rt = NULL;
2933 } else {
2934 continue;
2935 }
2936 }
a881ae1f 2937
57ec0afe 2938 sp_rt = addrconf_dst_alloc(idev, &sp_ifa->addr, false);
25fb6ca4
BK		 2939
2940 /* Failure cases are ignored */
534c8779
G		 2941 if (!IS_ERR(sp_rt)) {
2942 sp_ifa->rt = sp_rt;
25fb6ca4 2943 ip6_ins_rt(sp_rt);
534c8779 2944 }
25fb6ca4
BK		 2945 }
2946 read_unlock_bh(&idev->lock);
2947 }
1da177e4
LT		 2948}
2949
2ad3ed59
AA		 2950void addrconf_add_linklocal(struct inet6_dev *idev,
2951 const struct in6_addr *addr, u32 flags)
1da177e4 2952{
8e5e8f30 2953 struct inet6_ifaddr *ifp;
64236f3f 2954 u32 addr_flags = flags | IFA_F_PERMANENT;
95c385b4
NH		 2955
2956#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2957 if (idev->cnf.optimistic_dad &&
702beb87 2958 !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
95c385b4
NH		 2959 addr_flags |= IFA_F_OPTIMISTIC;
2960#endif
1da177e4 2961
07edd741
HFS		 2962 ifp = ipv6_add_addr(idev, addr, NULL, 64, IFA_LINK, addr_flags,
2963 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
1da177e4 2964 if (!IS_ERR(ifp)) {
46d48046 2965 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
cf22f9a2 2966 addrconf_dad_start(ifp);
1da177e4
LT		 2967 in6_ifa_put(ifp);
2968 }
2969}
2ad3ed59 2970EXPORT_SYMBOL_GPL(addrconf_add_linklocal);
1da177e4 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
f1705ec1
DA		 3179static int fixup_permanent_addr(struct inet6_dev *idev,
3180 struct inet6_ifaddr *ifp)
3181{
3182 if (!ifp->rt) {
3183 struct rt6_info *rt;
3184
3185 rt = addrconf_dst_alloc(idev, &ifp->addr, false);
3186 if (unlikely(IS_ERR(rt)))
3187 return PTR_ERR(rt);
3188
3189 ifp->rt = rt;
3190 }
3191
3192 if (!(ifp->flags & IFA_F_NOPREFIXROUTE)) {
3193 addrconf_prefix_route(&ifp->addr, ifp->prefix_len,
3194 idev->dev, 0, 0);
3195 }
3196
3197 addrconf_dad_start(ifp);
3198
3199 return 0;
3200}
3201
3202static void addrconf_permanent_addr(struct net_device *dev)
3203{
3204 struct inet6_ifaddr *ifp, *tmp;
3205 struct inet6_dev *idev;
3206
3207 idev = __in6_dev_get(dev);
3208 if (!idev)
3209 return;
3210
3211 write_lock_bh(&idev->lock);
3212
3213 list_for_each_entry_safe(ifp, tmp, &idev->addr_list, if_list) {
3214 if ((ifp->flags & IFA_F_PERMANENT) &&
3215 fixup_permanent_addr(idev, ifp) < 0) {
3216 write_unlock_bh(&idev->lock);
3217 ipv6_del_addr(ifp);
3218 write_lock_bh(&idev->lock);
3219
3220 net_info_ratelimited("%s: Failed to add prefix route for address %pI6c; dropping\n",
3221 idev->dev->name, &ifp->addr);
3222 }
3223 }
3224
3225 write_unlock_bh(&idev->lock);
3226}
3227
1ab1457c 3228static int addrconf_notify(struct notifier_block *this, unsigned long event,
351638e7 3229 void *ptr)
1da177e4 3230{
351638e7 3231 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
4f7f34ea 3232 struct netdev_notifier_changeupper_info *info;
748e2d93 3233 struct inet6_dev *idev = __in6_dev_get(dev);
c5e33bdd 3234 int run_pending = 0;
b217d616 3235 int err;
1da177e4 3236
e21e8467 3237 switch (event) {
45ba9dd2 3238 case NETDEV_REGISTER:
74235a25 3239 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
45ba9dd2 3240 idev = ipv6_add_dev(dev);
a317a2f1
WC		 3241 if (IS_ERR(idev))
3242 return notifier_from_errno(PTR_ERR(idev));
45ba9dd2
YH		 3243 }
3244 break;
bcdd553f 3245
b7b0b1d2
AD		 3246 case NETDEV_CHANGEMTU:
3247 /* if MTU under IPV6_MIN_MTU stop IPv6 on this interface. */
3248 if (dev->mtu < IPV6_MIN_MTU) {
3249 addrconf_ifdown(dev, 1);
3250 break;
3251 }
3252
3253 if (idev) {
3254 rt6_mtu_change(dev, dev->mtu);
3255 idev->cnf.mtu6 = dev->mtu;
3256 break;
3257 }
3258
3259 /* allocate new idev */
3260 idev = ipv6_add_dev(dev);
3261 if (IS_ERR(idev))
3262 break;
3263
3264 /* device is still not ready */
3265 if (!(idev->if_flags & IF_READY))
3266 break;
3267
3268 run_pending = 1;
3269
3270 /* fall through */
3271
1da177e4 3272 case NETDEV_UP:
3c21edbd 3273 case NETDEV_CHANGE:
c2edacf8
JV		 3274 if (dev->flags & IFF_SLAVE)
3275 break;
3276
3ce62a84
WC		 3277 if (idev && idev->cnf.disable_ipv6)
3278 break;
3279
3c21edbd 3280 if (event == NETDEV_UP) {
38bd10c4
DA		 3281 /* restore routes for permanent addresses */
3282 addrconf_permanent_addr(dev);
3283
f24e3d65 3284 if (!addrconf_qdisc_ok(dev)) {
3c21edbd 3285 /* device is not ready yet. */
f3213831 3286 pr_info("ADDRCONF(NETDEV_UP): %s: link is not ready\n",
3c21edbd
YH		 3287 dev->name);
3288 break;
3289 }
99081049 3290
d31c7b8f
EP		 3291 if (!idev && dev->mtu >= IPV6_MIN_MTU)
3292 idev = ipv6_add_dev(dev);
3293
a317a2f1 3294 if (!IS_ERR_OR_NULL(idev)) {
99081049 3295 idev->if_flags |= IF_READY;
e3ec6cfc
BT		 3296 run_pending = 1;
3297 }
b7b0b1d2 3298 } else if (event == NETDEV_CHANGE) {
f24e3d65 3299 if (!addrconf_qdisc_ok(dev)) {
3c21edbd
YH		 3300 /* device is still not ready. */
3301 break;
3302 }
3303
3304 if (idev) {
bcdd553f 3305 if (idev->if_flags & IF_READY)
3c21edbd
YH		 3306 /* device is already configured. */
3307 break;
3c21edbd
YH		 3308 idev->if_flags |= IF_READY;
3309 }
3310
f3213831
JP		 3311 pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n",
3312 dev->name);
3c21edbd 3313
c5e33bdd 3314 run_pending = 1;
3c21edbd
YH		 3315 }
3316
e21e8467 3317 switch (dev->type) {
07a93626 3318#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4
LT		 3319 case ARPHRD_SIT:
3320 addrconf_sit_config(dev);
3321 break;
aee80b54 3322#endif
07a93626 3323#if IS_ENABLED(CONFIG_NET_IPGRE)
aee80b54 3324 case ARPHRD_IPGRE:
3325 addrconf_gre_config(dev);
3326 break;
0be669bb 3327#endif
1da177e4
LT		 3328 case ARPHRD_LOOPBACK:
3329 init_loopback(dev);
3330 break;
3331
3332 default:
3333 addrconf_dev_config(dev);
3334 break;
3ff50b79 3335 }
bcdd553f 3336
a317a2f1 3337 if (!IS_ERR_OR_NULL(idev)) {
c5e33bdd
YH		 3338 if (run_pending)
3339 addrconf_dad_run(idev);
3340
bcdd553f
SH		 3341 /*
3342 * If the MTU changed during the interface down,
3343 * when the interface up, the changed MTU must be
3344 * reflected in the idev as well as routers.
1da177e4 3345 */
bcdd553f
SH		 3346 if (idev->cnf.mtu6 != dev->mtu &&
3347 dev->mtu >= IPV6_MIN_MTU) {
1da177e4
LT		 3348 rt6_mtu_change(dev, dev->mtu);
3349 idev->cnf.mtu6 = dev->mtu;
3350 }
3351 idev->tstamp = jiffies;
3352 inet6_ifinfo_notify(RTM_NEWLINK, idev);
bcdd553f
SH		 3353
3354 /*
3355 * If the changed mtu during down is lower than
3356 * IPV6_MIN_MTU stop IPv6 on this interface.
1da177e4
LT		 3357 */
3358 if (dev->mtu < IPV6_MIN_MTU)
bcdd553f 3359 addrconf_ifdown(dev, 1);
1da177e4
LT		 3360 }
3361 break;
3362
1da177e4
LT		 3363 case NETDEV_DOWN:
3364 case NETDEV_UNREGISTER:
3365 /*
3366 * Remove all addresses from this interface.
3367 */
3368 addrconf_ifdown(dev, event != NETDEV_DOWN);
3369 break;
3c21edbd 3370
1da177e4 3371 case NETDEV_CHANGENAME:
1da177e4 3372 if (idev) {
5632c515 3373 snmp6_unregister_dev(idev);
408c4768 3374 addrconf_sysctl_unregister(idev);
a317a2f1 3375 err = addrconf_sysctl_register(idev);
b217d616
HX		 3376 if (err)
3377 return notifier_from_errno(err);
a317a2f1
WC		 3378 err = snmp6_register_dev(idev);
3379 if (err) {
3380 addrconf_sysctl_unregister(idev);
3381 return notifier_from_errno(err);
3382 }
5632c515 3383 }
1da177e4 3384 break;
bcdd553f 3385
93d9b7d7
JP		 3386 case NETDEV_PRE_TYPE_CHANGE:
3387 case NETDEV_POST_TYPE_CHANGE:
3ef0952c
AL		 3388 if (idev)
3389 addrconf_type_change(dev, event);
75c78500 3390 break;
4f7f34ea
DA		 3391
3392 case NETDEV_CHANGEUPPER:
3393 info = ptr;
3394
3395 /* flush all routes if dev is linked to or unlinked from
3396 * an L3 master device (e.g., VRF)
3397 */
3398 if (info->upper_dev && netif_is_l3_master(info->upper_dev))
3399 addrconf_ifdown(dev, 0);
3ff50b79 3400 }
1da177e4
LT		 3401
3402 return NOTIFY_OK;
3403}
3404
3405/*
3406 * addrconf module should be notified of a device going up
3407 */
3408static struct notifier_block ipv6_dev_notf = {
3409 .notifier_call = addrconf_notify,
1da177e4
LT		 3410};
3411
93d9b7d7 3412static void addrconf_type_change(struct net_device *dev, unsigned long event)
75c78500
MS		 3413{
3414 struct inet6_dev *idev;
3415 ASSERT_RTNL();
3416
3417 idev = __in6_dev_get(dev);
3418
93d9b7d7 3419 if (event == NETDEV_POST_TYPE_CHANGE)
75c78500 3420 ipv6_mc_remap(idev);
93d9b7d7 3421 else if (event == NETDEV_PRE_TYPE_CHANGE)
75c78500
MS		 3422 ipv6_mc_unmap(idev);
3423}
3424
70af921d
DA		 3425static bool addr_is_local(const struct in6_addr *addr)
3426{
3427 return ipv6_addr_type(addr) &
3428 (IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK);
3429}
3430
1da177e4
LT		 3431static int addrconf_ifdown(struct net_device *dev, int how)
3432{
c346dca1 3433 struct net *net = dev_net(dev);
502a2ffd 3434 struct inet6_dev *idev;
f1705ec1
DA		 3435 struct inet6_ifaddr *ifa, *tmp;
3436 struct list_head del_list;
3437 int _keep_addr;
3438 bool keep_addr;
73a8bd74 3439 int state, i;
1da177e4
LT		 3440
3441 ASSERT_RTNL();
3442
73a8bd74
DM		 3443 rt6_ifdown(net, dev);
3444 neigh_ifdown(&nd_tbl, dev);
1da177e4
LT		 3445
3446 idev = __in6_dev_get(dev);
63159f29 3447 if (!idev)
1da177e4
LT		 3448 return -ENODEV;
3449
bcdd553f
SH		 3450 /*
3451 * Step 1: remove reference to ipv6 device from parent device.
3452 * Do not dev_put!
1da177e4 3453 */
439e2385 3454 if (how) {
1da177e4 3455 idev->dead = 1;
8814c4b5
YH		 3456
3457 /* protected by rtnl_lock */
a9b3cd7f 3458 RCU_INIT_POINTER(dev->ip6_ptr, NULL);
1da177e4
LT		 3459
3460 /* Step 1.5: remove snmp6 entry */
3461 snmp6_unregister_dev(idev);
3462
3463 }
3464
f1705ec1
DA		 3465 /* aggregate the system setting and interface setting */
3466 _keep_addr = net->ipv6.devconf_all->keep_addr_on_down;
3467 if (!_keep_addr)
3468 _keep_addr = idev->cnf.keep_addr_on_down;
3469
3470 /* combine the user config with event to determine if permanent
3471 * addresses are to be removed from address hash table
3472 */
3473 keep_addr = !(how || _keep_addr <= 0);
3474
73a8bd74
DM		 3475 /* Step 2: clear hash table */
3476 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3477 struct hlist_head *h = &inet6_addr_lst[i];
73a8bd74
DM		 3478
3479 spin_lock_bh(&addrconf_hash_lock);
67ba4152 3480restart:
b67bfe0d 3481 hlist_for_each_entry_rcu(ifa, h, addr_lst) {
73a8bd74 3482 if (ifa->idev == idev) {
c15b1cca 3483 addrconf_del_dad_work(ifa);
f1705ec1
DA		 3484 /* combined flag + permanent flag decide if
3485 * address is retained on a down event
3486 */
3487 if (!keep_addr ||
70af921d
DA		 3488 !(ifa->flags & IFA_F_PERMANENT) ||
3489 addr_is_local(&ifa->addr)) {
f1705ec1
DA		 3490 hlist_del_init_rcu(&ifa->addr_lst);
3491 goto restart;
3492 }
73a8bd74
DM		 3493 }
3494 }
3495 spin_unlock_bh(&addrconf_hash_lock);
3496 }
3497
1da177e4
LT		 3498 write_lock_bh(&idev->lock);
3499
b7b1bfce
HFS		 3500 addrconf_del_rs_timer(idev);
3501
bcdd553f 3502 /* Step 2: clear flags for stateless addrconf */
439e2385 3503 if (!how)
3c21edbd 3504 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
1da177e4 3505
439e2385 3506 if (how && del_timer(&idev->regen_timer))
1da177e4
LT		 3507 in6_dev_put(idev);
3508
bcdd553f 3509 /* Step 3: clear tempaddr list */
372e6c8f 3510 while (!list_empty(&idev->tempaddr_list)) {
3511 ifa = list_first_entry(&idev->tempaddr_list,
3512 struct inet6_ifaddr, tmp_list);
3513 list_del(&ifa->tmp_list);
1da177e4
LT		 3514 write_unlock_bh(&idev->lock);
3515 spin_lock_bh(&ifa->lock);
3516
3517 if (ifa->ifpub) {
3518 in6_ifa_put(ifa->ifpub);
3519 ifa->ifpub = NULL;
3520 }
3521 spin_unlock_bh(&ifa->lock);
3522 in6_ifa_put(ifa);
3523 write_lock_bh(&idev->lock);
3524 }
8f37ada5 3525
f1705ec1
DA		 3526 /* re-combine the user config with event to determine if permanent
3527 * addresses are to be removed from the interface list
3528 */
3529 keep_addr = (!how && _keep_addr > 0);
84e8b803 3530
f1705ec1
DA		 3531 INIT_LIST_HEAD(&del_list);
3532 list_for_each_entry_safe(ifa, tmp, &idev->addr_list, if_list) {
38bd10c4
DA		 3533 struct rt6_info *rt = NULL;
3534
f1705ec1 3535 addrconf_del_dad_work(ifa);
84e8b803 3536
73a8bd74 3537 write_unlock_bh(&idev->lock);
8e8e676d 3538 spin_lock_bh(&ifa->lock);
f1705ec1 3539
70af921d
DA		 3540 if (keep_addr && (ifa->flags & IFA_F_PERMANENT) &&
3541 !addr_is_local(&ifa->addr)) {
f1705ec1
DA		 3542 /* set state to skip the notifier below */
3543 state = INET6_IFADDR_STATE_DEAD;
3544 ifa->state = 0;
3545 if (!(ifa->flags & IFA_F_NODAD))
3546 ifa->flags |= IFA_F_TENTATIVE;
38bd10c4
DA		 3547
3548 rt = ifa->rt;
3549 ifa->rt = NULL;
f1705ec1
DA		 3550 } else {
3551 state = ifa->state;
3552 ifa->state = INET6_IFADDR_STATE_DEAD;
3553
3554 list_del(&ifa->if_list);
3555 list_add(&ifa->if_list, &del_list);
3556 }
3557
8e8e676d 3558 spin_unlock_bh(&ifa->lock);
9d82ca98 3559
38bd10c4
DA		 3560 if (rt)
3561 ip6_del_rt(rt);
3562
73a8bd74
DM		 3563 if (state != INET6_IFADDR_STATE_DEAD) {
3564 __ipv6_ifa_notify(RTM_DELADDR, ifa);
f88c91dd 3565 inet6addr_notifier_call_chain(NETDEV_DOWN, ifa);
27bdb2ab 3566 }
8f37ada5 3567
73a8bd74
DM		 3568 write_lock_bh(&idev->lock);
3569 }
8f37ada5 3570
1da177e4
LT		 3571 write_unlock_bh(&idev->lock);
3572
f1705ec1
DA		 3573 /* now clean up addresses to be removed */
3574 while (!list_empty(&del_list)) {
3575 ifa = list_first_entry(&del_list,
3576 struct inet6_ifaddr, if_list);
3577 list_del(&ifa->if_list);
3578
3579 in6_ifa_put(ifa);
3580 }
3581
381f4dca
SD		 3582 /* Step 5: Discard anycast and multicast list */
3583 if (how) {
3584 ipv6_ac_destroy_dev(idev);
1da177e4 3585 ipv6_mc_destroy_dev(idev);
381f4dca 3586 } else {
1da177e4 3587 ipv6_mc_down(idev);
381f4dca 3588 }
1da177e4 3589
1da177e4 3590 idev->tstamp = jiffies;
1ab1457c 3591
bcdd553f 3592 /* Last: Shot the device (if unregistered) */
439e2385 3593 if (how) {
408c4768 3594 addrconf_sysctl_unregister(idev);
1da177e4
LT		 3595 neigh_parms_release(&nd_tbl, idev->nd_parms);
3596 neigh_ifdown(&nd_tbl, dev);
3597 in6_dev_put(idev);
3598 }
3599 return 0;
3600}
3601
3602static void addrconf_rs_timer(unsigned long data)
3603{
b7b1bfce 3604 struct inet6_dev *idev = (struct inet6_dev *)data;
caf92bc4 3605 struct net_device *dev = idev->dev;
b7b1bfce 3606 struct in6_addr lladdr;
1da177e4 3607
b7b1bfce 3608 write_lock(&idev->lock);
5b2a1953 3609 if (idev->dead || !(idev->if_flags & IF_READY))
1da177e4
LT		 3610 goto out;
3611
9ba2add3 3612 if (!ipv6_accept_ra(idev))
5b2a1953 3613 goto out;
3614
3615 /* Announcement received after solicitation was sent */
3616 if (idev->if_flags & IF_RA_RCVD)
1da177e4 3617 goto out;
1da177e4 3618
b7b1bfce 3619 if (idev->rs_probes++ < idev->cnf.rtr_solicits) {
caf92bc4
CW		 3620 write_unlock(&idev->lock);
3621 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
3622 ndisc_send_rs(dev, &lladdr,
b7b1bfce
HFS		 3623 &in6addr_linklocal_allrouters);
3624 else
caf92bc4 3625 goto put;
1da177e4 3626
caf92bc4 3627 write_lock(&idev->lock);
b7b1bfce
HFS		 3628 /* The wait after the last probe can be shorter */
3629 addrconf_mod_rs_timer(idev, (idev->rs_probes ==
3630 idev->cnf.rtr_solicits) ?
3631 idev->cnf.rtr_solicit_delay :
3632 idev->cnf.rtr_solicit_interval);
1da177e4 3633 } else {
1da177e4
LT		 3634 /*
3635 * Note: we do not support deprecated "all on-link"
3636 * assumption any longer.
3637 */
91df42be 3638 pr_debug("%s: no IPv6 routers present\n", idev->dev->name);
1da177e4
LT		 3639 }
3640
3641out:
b7b1bfce 3642 write_unlock(&idev->lock);
caf92bc4 3643put:
b7b1bfce 3644 in6_dev_put(idev);
1da177e4
LT		 3645}
3646
3647/*
3648 * Duplicate Address Detection
3649 */
3c21edbd
YH		 3650static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
3651{
3652 unsigned long rand_num;
3653 struct inet6_dev *idev = ifp->idev;
3654
95c385b4
NH		 3655 if (ifp->flags & IFA_F_OPTIMISTIC)
3656 rand_num = 0;
3657 else
63862b5b 3658 rand_num = prandom_u32() % (idev->cnf.rtr_solicit_delay ? : 1);
95c385b4 3659
b7b1bfce 3660 ifp->dad_probes = idev->cnf.dad_transmits;
c15b1cca 3661 addrconf_mod_dad_work(ifp, rand_num);
3c21edbd
YH		 3662}
3663
c15b1cca 3664static void addrconf_dad_begin(struct inet6_ifaddr *ifp)
1da177e4
LT		 3665{
3666 struct inet6_dev *idev = ifp->idev;
3667 struct net_device *dev = idev->dev;
16186a82 3668 bool notify = false;
1da177e4
LT		 3669
3670 addrconf_join_solict(dev, &ifp->addr);
3671
63862b5b 3672 prandom_seed((__force u32) ifp->addr.s6_addr32[3]);
1da177e4
LT		 3673
3674 read_lock_bh(&idev->lock);
622ccdf1 3675 spin_lock(&ifp->lock);
e9d3e084 3676 if (ifp->state == INET6_IFADDR_STATE_DEAD)
1da177e4 3677 goto out;
1da177e4
LT		 3678
3679 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
1b34be74 3680 idev->cnf.accept_dad < 1 ||
55ebaef1
NT		 3681 !(ifp->flags&IFA_F_TENTATIVE) ||
3682 ifp->flags & IFA_F_NODAD) {
cc411d0b 3683 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
21809faf 3684 spin_unlock(&ifp->lock);
1da177e4
LT		 3685 read_unlock_bh(&idev->lock);
3686
3687 addrconf_dad_completed(ifp);
3688 return;
3689 }
3690
6732bade 3691 if (!(idev->if_flags & IF_READY)) {
21809faf 3692 spin_unlock(&ifp->lock);
6732bade 3693 read_unlock_bh(&idev->lock);
3c21edbd 3694 /*
590a9887 3695 * If the device is not ready:
3c21edbd
YH		 3696 * - keep it tentative if it is a permanent address.
3697 * - otherwise, kill it.
3698 */
3699 in6_ifa_hold(ifp);
cc411d0b 3700 addrconf_dad_stop(ifp, 0);
6732bade 3701 return;
3c21edbd 3702 }
95c385b4
NH		 3703
3704 /*
3705 * Optimistic nodes can start receiving
3706 * Frames right away
3707 */
7fd2561e 3708 if (ifp->flags & IFA_F_OPTIMISTIC) {
95c385b4 3709 ip6_ins_rt(ifp->rt);
7fd2561e
EK		 3710 if (ipv6_use_optimistic_addr(idev)) {
3711 /* Because optimistic nodes can use this address,
3712 * notify listeners. If DAD fails, RTM_DELADDR is sent.
3713 */
16186a82 3714 notify = true;
7fd2561e
EK		 3715 }
3716 }
95c385b4 3717
6732bade 3718 addrconf_dad_kick(ifp);
1da177e4 3719out:
622ccdf1 3720 spin_unlock(&ifp->lock);
1da177e4 3721 read_unlock_bh(&idev->lock);
16186a82
SAK		 3722 if (notify)
3723 ipv6_ifa_notify(RTM_NEWADDR, ifp);
1da177e4
LT		 3724}
3725
c15b1cca 3726static void addrconf_dad_start(struct inet6_ifaddr *ifp)
1da177e4 3727{
c15b1cca
HFS		 3728 bool begin_dad = false;
3729
8e8e676d 3730 spin_lock_bh(&ifp->lock);
c15b1cca
HFS		 3731 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
3732 ifp->state = INET6_IFADDR_STATE_PREDAD;
3733 begin_dad = true;
3734 }
8e8e676d 3735 spin_unlock_bh(&ifp->lock);
c15b1cca
HFS		 3736
3737 if (begin_dad)
3738 addrconf_mod_dad_work(ifp, 0);
3739}
3740
3741static void addrconf_dad_work(struct work_struct *w)
3742{
3743 struct inet6_ifaddr *ifp = container_of(to_delayed_work(w),
3744 struct inet6_ifaddr,
3745 dad_work);
1da177e4 3746 struct inet6_dev *idev = ifp->idev;
1da177e4
LT		 3747 struct in6_addr mcaddr;
3748
c15b1cca
HFS		 3749 enum {
3750 DAD_PROCESS,
3751 DAD_BEGIN,
3752 DAD_ABORT,
3753 } action = DAD_PROCESS;
3754
3755 rtnl_lock();
3756
8e8e676d 3757 spin_lock_bh(&ifp->lock);
c15b1cca
HFS		 3758 if (ifp->state == INET6_IFADDR_STATE_PREDAD) {
3759 action = DAD_BEGIN;
3760 ifp->state = INET6_IFADDR_STATE_DAD;
3761 } else if (ifp->state == INET6_IFADDR_STATE_ERRDAD) {
3762 action = DAD_ABORT;
3763 ifp->state = INET6_IFADDR_STATE_POSTDAD;
3764 }
8e8e676d 3765 spin_unlock_bh(&ifp->lock);
c15b1cca
HFS		 3766
3767 if (action == DAD_BEGIN) {
3768 addrconf_dad_begin(ifp);
3769 goto out;
3770 } else if (action == DAD_ABORT) {
3771 addrconf_dad_stop(ifp, 1);
3772 goto out;
3773 }
3774
b7b1bfce 3775 if (!ifp->dad_probes && addrconf_dad_end(ifp))
f2344a13
HX		 3776 goto out;
3777
c15b1cca 3778 write_lock_bh(&idev->lock);
122e4519 3779 if (idev->dead || !(idev->if_flags & IF_READY)) {
c15b1cca 3780 write_unlock_bh(&idev->lock);
1da177e4
LT		 3781 goto out;
3782 }
21809faf 3783
3784 spin_lock(&ifp->lock);
622ccdf1
HX		 3785 if (ifp->state == INET6_IFADDR_STATE_DEAD) {
3786 spin_unlock(&ifp->lock);
c15b1cca 3787 write_unlock_bh(&idev->lock);
622ccdf1
HX		 3788 goto out;
3789 }
3790
b7b1bfce 3791 if (ifp->dad_probes == 0) {
1da177e4
LT		 3792 /*
3793 * DAD was successful
3794 */
3795
cc411d0b 3796 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
21809faf 3797 spin_unlock(&ifp->lock);
c15b1cca 3798 write_unlock_bh(&idev->lock);
1da177e4
LT		 3799
3800 addrconf_dad_completed(ifp);
3801
3802 goto out;
3803 }
3804
b7b1bfce 3805 ifp->dad_probes--;
c15b1cca
HFS		 3806 addrconf_mod_dad_work(ifp,
3807 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME));
21809faf 3808 spin_unlock(&ifp->lock);
c15b1cca 3809 write_unlock_bh(&idev->lock);
1da177e4
LT		 3810
3811 /* send a neighbour solicitation for our addr */
1da177e4 3812 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
304d888b 3813 ndisc_send_ns(ifp->idev->dev, &ifp->addr, &mcaddr, &in6addr_any);
1da177e4
LT		 3814out:
3815 in6_ifa_put(ifp);
c15b1cca 3816 rtnl_unlock();
1da177e4
LT		 3817}
3818
11ffff75
HFS		 3819/* ifp->idev must be at least read locked */
3820static bool ipv6_lonely_lladdr(struct inet6_ifaddr *ifp)
3821{
3822 struct inet6_ifaddr *ifpiter;
3823 struct inet6_dev *idev = ifp->idev;
3824
602582ca
HFS		 3825 list_for_each_entry_reverse(ifpiter, &idev->addr_list, if_list) {
3826 if (ifpiter->scope > IFA_LINK)
3827 break;
11ffff75
HFS		 3828 if (ifp != ifpiter && ifpiter->scope == IFA_LINK &&
3829 (ifpiter->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE|
3830 IFA_F_OPTIMISTIC|IFA_F_DADFAILED)) ==
3831 IFA_F_PERMANENT)
3832 return false;
3833 }
3834 return true;
3835}
3836
1da177e4
LT		 3837static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
3838{
e21e8467 3839 struct net_device *dev = ifp->idev->dev;
b7b1bfce 3840 struct in6_addr lladdr;
b173ee48 3841 bool send_rs, send_mld;
b7b1bfce 3842
c15b1cca 3843 addrconf_del_dad_work(ifp);
1da177e4
LT		 3844
3845 /*
3846 * Configure the address for reception. Now it is valid.
3847 */
3848
3849 ipv6_ifa_notify(RTM_NEWADDR, ifp);
3850
026359bc
TA		 3851 /* If added prefix is link local and we are prepared to process
3852 router advertisements, start sending router solicitations.
1da177e4
LT		 3853 */
3854
1ec047eb 3855 read_lock_bh(&ifp->idev->lock);
11ffff75 3856 send_mld = ifp->scope == IFA_LINK && ipv6_lonely_lladdr(ifp);
b173ee48
HFS		 3857 send_rs = send_mld &&
3858 ipv6_accept_ra(ifp->idev) &&
1ec047eb 3859 ifp->idev->cnf.rtr_solicits > 0 &&
b173ee48 3860 (dev->flags&IFF_LOOPBACK) == 0;
1ec047eb
HFS		 3861 read_unlock_bh(&ifp->idev->lock);
3862
b173ee48
HFS		 3863 /* While dad is in progress mld report's source address is in6_addrany.
3864 * Resend with proper ll now.
3865 */
3866 if (send_mld)
3867 ipv6_mc_dad_complete(ifp->idev);
3868
1ec047eb 3869 if (send_rs) {
1da177e4
LT		 3870 /*
3871 * If a host as already performed a random delay
3872 * [...] as part of DAD [...] there is no need
3873 * to delay again before sending the first RS
3874 */
1ec047eb 3875 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
b7b1bfce 3876 return;
1ec047eb 3877 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters);
1da177e4 3878
b7b1bfce
HFS		 3879 write_lock_bh(&ifp->idev->lock);
3880 spin_lock(&ifp->lock);
3881 ifp->idev->rs_probes = 1;
1da177e4 3882 ifp->idev->if_flags |= IF_RS_SENT;
b7b1bfce
HFS		 3883 addrconf_mod_rs_timer(ifp->idev,
3884 ifp->idev->cnf.rtr_solicit_interval);
3885 spin_unlock(&ifp->lock);
3886 write_unlock_bh(&ifp->idev->lock);
1da177e4
LT		 3887 }
3888}
3889
e21e8467
SH		 3890static void addrconf_dad_run(struct inet6_dev *idev)
3891{
c5e33bdd
YH		 3892 struct inet6_ifaddr *ifp;
3893
3894 read_lock_bh(&idev->lock);
502a2ffd 3895 list_for_each_entry(ifp, &idev->addr_list, if_list) {
21809faf 3896 spin_lock(&ifp->lock);
f2344a13
HX		 3897 if (ifp->flags & IFA_F_TENTATIVE &&
3898 ifp->state == INET6_IFADDR_STATE_DAD)
3899 addrconf_dad_kick(ifp);
21809faf 3900 spin_unlock(&ifp->lock);
c5e33bdd
YH		 3901 }
3902 read_unlock_bh(&idev->lock);
3903}
3904
1da177e4
LT		 3905#ifdef CONFIG_PROC_FS
3906struct if6_iter_state {
3c40090a 3907 struct seq_net_private p;
1da177e4 3908 int bucket;
1d578303 3909 int offset;
1da177e4
LT		 3910};
3911
1d578303 3912static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos)
1da177e4
LT		 3913{
3914 struct inet6_ifaddr *ifa = NULL;
3915 struct if6_iter_state *state = seq->private;
1218854a 3916 struct net *net = seq_file_net(seq);
1d578303 3917 int p = 0;
1da177e4 3918
1d578303
MM		 3919 /* initial bucket if pos is 0 */
3920 if (pos == 0) {
3921 state->bucket = 0;
3922 state->offset = 0;
3923 }
3924
3925 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
b67bfe0d 3926 hlist_for_each_entry_rcu_bh(ifa, &inet6_addr_lst[state->bucket],
1d578303 3927 addr_lst) {
9f0d3c27
ED		 3928 if (!net_eq(dev_net(ifa->idev->dev), net))
3929 continue;
1d578303
MM		 3930 /* sync with offset */
3931 if (p < state->offset) {
3932 p++;
3933 continue;
3934 }
3935 state->offset++;
9f0d3c27 3936 return ifa;
1d578303
MM		 3937 }
3938
3939 /* prepare for next bucket */
3940 state->offset = 0;
3941 p = 0;
1da177e4 3942 }
c2e21293 3943 return NULL;
1da177e4
LT		 3944}
3945
c2e21293 3946static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
3947 struct inet6_ifaddr *ifa)
1da177e4
LT		 3948{
3949 struct if6_iter_state *state = seq->private;
1218854a 3950 struct net *net = seq_file_net(seq);
1da177e4 3951
b67bfe0d 3952 hlist_for_each_entry_continue_rcu_bh(ifa, addr_lst) {
9f0d3c27
ED		 3953 if (!net_eq(dev_net(ifa->idev->dev), net))
3954 continue;
1d578303 3955 state->offset++;
9f0d3c27 3956 return ifa;
1d578303 3957 }
3c40090a 3958
c2e21293 3959 while (++state->bucket < IN6_ADDR_HSIZE) {
1d578303 3960 state->offset = 0;
b67bfe0d 3961 hlist_for_each_entry_rcu_bh(ifa,
c2e21293 3962 &inet6_addr_lst[state->bucket], addr_lst) {
9f0d3c27
ED		 3963 if (!net_eq(dev_net(ifa->idev->dev), net))
3964 continue;
1d578303 3965 state->offset++;
9f0d3c27 3966 return ifa;
c2e21293 3967 }
1da177e4 3968 }
3c40090a 3969
c2e21293 3970 return NULL;
1da177e4
LT		 3971}
3972
1da177e4 3973static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
4f70ecca 3974 __acquires(rcu_bh)
1da177e4 3975{
5c578aed 3976 rcu_read_lock_bh();
1d578303 3977 return if6_get_first(seq, *pos);
1da177e4
LT		 3978}
3979
3980static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3981{
3982 struct inet6_ifaddr *ifa;
3983
3984 ifa = if6_get_next(seq, v);
3985 ++*pos;
3986 return ifa;
3987}
3988
3989static void if6_seq_stop(struct seq_file *seq, void *v)
4f70ecca 3990 __releases(rcu_bh)
1da177e4 3991{
5c578aed 3992 rcu_read_unlock_bh();
1da177e4
LT		 3993}
3994
3995static int if6_seq_show(struct seq_file *seq, void *v)
3996{
3997 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
971a351c 3998 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
b071195d 3999 &ifp->addr,
1da177e4
LT		 4000 ifp->idev->dev->ifindex,
4001 ifp->prefix_len,
4002 ifp->scope,
971a351c 4003 (u8) ifp->flags,
1da177e4
LT		 4004 ifp->idev->dev->name);
4005 return 0;
4006}
4007
56b3d975 4008static const struct seq_operations if6_seq_ops = {
1da177e4
LT		 4009 .start = if6_seq_start,
4010 .next = if6_seq_next,
4011 .show = if6_seq_show,
4012 .stop = if6_seq_stop,
4013};
4014
4015static int if6_seq_open(struct inode *inode, struct file *file)
4016{
3c40090a
DL		 4017 return seq_open_net(inode, file, &if6_seq_ops,
4018 sizeof(struct if6_iter_state));
1da177e4
LT		 4019}
4020
9a32144e 4021static const struct file_operations if6_fops = {
1da177e4
LT		 4022 .owner = THIS_MODULE,
4023 .open = if6_seq_open,
4024 .read = seq_read,
4025 .llseek = seq_lseek,
3c40090a 4026 .release = seq_release_net,
1da177e4
LT		 4027};
4028
2c8c1e72 4029static int __net_init if6_proc_net_init(struct net *net)
1da177e4 4030{
d4beaa66 4031 if (!proc_create("if_inet6", S_IRUGO, net->proc_net, &if6_fops))
1da177e4
LT		 4032 return -ENOMEM;
4033 return 0;
4034}
4035
2c8c1e72 4036static void __net_exit if6_proc_net_exit(struct net *net)
3c40090a 4037{
ece31ffd 4038 remove_proc_entry("if_inet6", net->proc_net);
3c40090a
DL		 4039}
4040
4041static struct pernet_operations if6_proc_net_ops = {
67ba4152
IM		 4042 .init = if6_proc_net_init,
4043 .exit = if6_proc_net_exit,
3c40090a
DL		 4044};
4045
4046int __init if6_proc_init(void)
4047{
4048 return register_pernet_subsys(&if6_proc_net_ops);
4049}
4050
1da177e4
LT		 4051void if6_proc_exit(void)
4052{
3c40090a 4053 unregister_pernet_subsys(&if6_proc_net_ops);
1da177e4
LT		 4054}
4055#endif /* CONFIG_PROC_FS */
4056
07a93626 4057#if IS_ENABLED(CONFIG_IPV6_MIP6)
3b9f9a1c 4058/* Check if address is a home address configured on any interface. */
b71d1d42 4059int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr)
3b9f9a1c
NT		 4060{
4061 int ret = 0;
c2e21293 4062 struct inet6_ifaddr *ifp = NULL;
ddbe5032 4063 unsigned int hash = inet6_addr_hash(addr);
c2e21293 4064
5c578aed 4065 rcu_read_lock_bh();
b67bfe0d 4066 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
878628fb 4067 if (!net_eq(dev_net(ifp->idev->dev), net))
389f6612 4068 continue;
caad295f 4069 if (ipv6_addr_equal(&ifp->addr, addr) &&
3b9f9a1c
NT		 4070 (ifp->flags & IFA_F_HOMEADDRESS)) {
4071 ret = 1;
4072 break;
4073 }
4074 }
5c578aed 4075 rcu_read_unlock_bh();
3b9f9a1c
NT		 4076 return ret;
4077}
4078#endif
4079
1da177e4
LT		 4080/*
4081 * Periodic address status verification
4082 */
4083
c15b1cca 4084static void addrconf_verify_rtnl(void)
1da177e4 4085{
b2db7564 4086 unsigned long now, next, next_sec, next_sched;
1da177e4 4087 struct inet6_ifaddr *ifp;
1da177e4
LT		 4088 int i;
4089
c15b1cca
HFS		 4090 ASSERT_RTNL();
4091
5c578aed 4092 rcu_read_lock_bh();
1da177e4 4093 now = jiffies;
b2db7564 4094 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
1da177e4 4095
c15b1cca 4096 cancel_delayed_work(&addr_chk_work);
1da177e4 4097
bcdd553f 4098 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
1da177e4 4099restart:
c15b1cca 4100 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[i], addr_lst) {
1da177e4 4101 unsigned long age;
1da177e4 4102
fad8da3e
YA		 4103 /* When setting preferred_lft to a value not zero or
4104 * infinity, while valid_lft is infinity
4105 * IFA_F_PERMANENT has a non-infinity life time.
4106 */
4107 if ((ifp->flags & IFA_F_PERMANENT) &&
4108 (ifp->prefered_lft == INFINITY_LIFE_TIME))
1da177e4
LT		 4109 continue;
4110
4111 spin_lock(&ifp->lock);
b2db7564
YH		 4112 /* We try to batch several events at once. */
4113 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
1da177e4 4114
8f27ebb9
YH		 4115 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
4116 age >= ifp->valid_lft) {
1da177e4
LT		 4117 spin_unlock(&ifp->lock);
4118 in6_ifa_hold(ifp);
1da177e4
LT		 4119 ipv6_del_addr(ifp);
4120 goto restart;
8f27ebb9
YH		 4121 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
4122 spin_unlock(&ifp->lock);
4123 continue;
1da177e4 4124 } else if (age >= ifp->prefered_lft) {
a1ed0526 4125 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
1da177e4
LT		 4126 int deprecate = 0;
4127
4128 if (!(ifp->flags&IFA_F_DEPRECATED)) {
4129 deprecate = 1;
4130 ifp->flags |= IFA_F_DEPRECATED;
4131 }
4132
fad8da3e
YA		 4133 if ((ifp->valid_lft != INFINITY_LIFE_TIME) &&
4134 (time_before(ifp->tstamp + ifp->valid_lft * HZ, next)))
1da177e4
LT		 4135 next = ifp->tstamp + ifp->valid_lft * HZ;
4136
4137 spin_unlock(&ifp->lock);
4138
4139 if (deprecate) {
4140 in6_ifa_hold(ifp);
1da177e4
LT		 4141
4142 ipv6_ifa_notify(0, ifp);
4143 in6_ifa_put(ifp);
4144 goto restart;
4145 }
1da177e4
LT		 4146 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
4147 !(ifp->flags&IFA_F_TENTATIVE)) {
88949cf4 4148 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
4149 ifp->idev->cnf.dad_transmits *
1f9248e5 4150 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME) / HZ;
88949cf4 4151
1da177e4
LT		 4152 if (age >= ifp->prefered_lft - regen_advance) {
4153 struct inet6_ifaddr *ifpub = ifp->ifpub;
4154 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
4155 next = ifp->tstamp + ifp->prefered_lft * HZ;
4156 if (!ifp->regen_count && ifpub) {
4157 ifp->regen_count++;
4158 in6_ifa_hold(ifp);
4159 in6_ifa_hold(ifpub);
4160 spin_unlock(&ifp->lock);
5c578aed 4161
291d809b
HY		 4162 spin_lock(&ifpub->lock);
4163 ifpub->regen_count = 0;
4164 spin_unlock(&ifpub->lock);
1da177e4
LT		 4165 ipv6_create_tempaddr(ifpub, ifp);
4166 in6_ifa_put(ifpub);
4167 in6_ifa_put(ifp);
4168 goto restart;
4169 }
4170 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
4171 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
4172 spin_unlock(&ifp->lock);
1da177e4
LT		 4173 } else {
4174 /* ifp->prefered_lft <= ifp->valid_lft */
4175 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
4176 next = ifp->tstamp + ifp->prefered_lft * HZ;
4177 spin_unlock(&ifp->lock);
4178 }
4179 }
1da177e4
LT		 4180 }
4181
b2db7564
YH		 4182 next_sec = round_jiffies_up(next);
4183 next_sched = next;
4184
4185 /* If rounded timeout is accurate enough, accept it. */
4186 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
4187 next_sched = next_sec;
4188
4189 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
4190 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
4191 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
4192
ba3542e1 4193 ADBG(KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
4194 now, next, next_sec, next_sched);
c15b1cca 4195 mod_delayed_work(addrconf_wq, &addr_chk_work, next_sched - now);
5c578aed 4196 rcu_read_unlock_bh();
1da177e4
LT		 4197}
4198
c15b1cca
HFS		 4199static void addrconf_verify_work(struct work_struct *w)
4200{
4201 rtnl_lock();
4202 addrconf_verify_rtnl();
4203 rtnl_unlock();
4204}
4205
4206static void addrconf_verify(void)
4207{
4208 mod_delayed_work(addrconf_wq, &addr_chk_work, 0);
4209}
4210
caeaba79
ND		 4211static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local,
4212 struct in6_addr **peer_pfx)
461d8837
TG		 4213{
4214 struct in6_addr *pfx = NULL;
4215
caeaba79
ND		 4216 *peer_pfx = NULL;
4217
461d8837
TG		 4218 if (addr)
4219 pfx = nla_data(addr);
4220
4221 if (local) {
4222 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
caeaba79
ND		 4223 *peer_pfx = pfx;
4224 pfx = nla_data(local);
461d8837
TG		 4225 }
4226
4227 return pfx;
4228}
4229
ef7c79ed 4230static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
461d8837
TG		 4231 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
4232 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
4233 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
479840ff 4234 [IFA_FLAGS] = { .len = sizeof(u32) },
461d8837
TG		 4235};
4236
1da177e4 4237static int
661d2967 4238inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh)
1da177e4 4239{
3b1e0a65 4240 struct net *net = sock_net(skb->sk);
b933f716
TG		 4241 struct ifaddrmsg *ifm;
4242 struct nlattr *tb[IFA_MAX+1];
caeaba79 4243 struct in6_addr *pfx, *peer_pfx;
6046d5b4 4244 u32 ifa_flags;
b933f716 4245 int err;
1da177e4 4246
b933f716
TG		 4247 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
4248 if (err < 0)
4249 return err;
4250
4251 ifm = nlmsg_data(nlh);
caeaba79 4252 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
63159f29 4253 if (!pfx)
1da177e4
LT		 4254 return -EINVAL;
4255
6046d5b4
HK		 4256 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
4257
4258 /* We ignore other flags so far. */
4259 ifa_flags &= IFA_F_MANAGETEMPADDR;
4260
4261 return inet6_addr_del(net, ifm->ifa_index, ifa_flags, pfx,
4262 ifm->ifa_prefixlen);
1da177e4
LT		 4263}
4264
479840ff 4265static int inet6_addr_modify(struct inet6_ifaddr *ifp, u32 ifa_flags,
55ebaef1 4266 u32 prefered_lft, u32 valid_lft)
081bba5b 4267{
6f704992
YH		 4268 u32 flags;
4269 clock_t expires;
4bed72e4 4270 unsigned long timeout;
53bd6749 4271 bool was_managetempaddr;
5b84efec 4272 bool had_prefixroute;
46d48046 4273
c15b1cca
HFS		 4274 ASSERT_RTNL();
4275
081bba5b
NT		 4276 if (!valid_lft || (prefered_lft > valid_lft))
4277 return -EINVAL;
4278
53bd6749
JP		 4279 if (ifa_flags & IFA_F_MANAGETEMPADDR &&
4280 (ifp->flags & IFA_F_TEMPORARY || ifp->prefix_len != 64))
4281 return -EINVAL;
4282
4bed72e4
YH		 4283 timeout = addrconf_timeout_fixup(valid_lft, HZ);
4284 if (addrconf_finite_timeout(timeout)) {
4285 expires = jiffies_to_clock_t(timeout * HZ);
4286 valid_lft = timeout;
6f704992 4287 flags = RTF_EXPIRES;
4bed72e4
YH		 4288 } else {
4289 expires = 0;
4290 flags = 0;
4291 ifa_flags |= IFA_F_PERMANENT;
6f704992 4292 }
081bba5b 4293
4bed72e4
YH		 4294 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
4295 if (addrconf_finite_timeout(timeout)) {
4296 if (timeout == 0)
4297 ifa_flags |= IFA_F_DEPRECATED;
4298 prefered_lft = timeout;
4299 }
081bba5b
NT		 4300
4301 spin_lock_bh(&ifp->lock);
53bd6749 4302 was_managetempaddr = ifp->flags & IFA_F_MANAGETEMPADDR;
5b84efec
TH		 4303 had_prefixroute = ifp->flags & IFA_F_PERMANENT &&
4304 !(ifp->flags & IFA_F_NOPREFIXROUTE);
53bd6749 4305 ifp->flags &= ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD |
761aac73
TH		 4306 IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
4307 IFA_F_NOPREFIXROUTE);
53bd6749 4308 ifp->flags |= ifa_flags;
081bba5b
NT		 4309 ifp->tstamp = jiffies;
4310 ifp->valid_lft = valid_lft;
4311 ifp->prefered_lft = prefered_lft;
4312
4313 spin_unlock_bh(&ifp->lock);
4314 if (!(ifp->flags&IFA_F_TENTATIVE))
4315 ipv6_ifa_notify(0, ifp);
081bba5b 4316
761aac73
TH		 4317 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) {
4318 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
4319 expires, flags);
5b84efec
TH		 4320 } else if (had_prefixroute) {
4321 enum cleanup_prefix_rt_t action;
4322 unsigned long rt_expires;
4323
4324 write_lock_bh(&ifp->idev->lock);
4325 action = check_cleanup_prefix_route(ifp, &rt_expires);
4326 write_unlock_bh(&ifp->idev->lock);
4327
4328 if (action != CLEANUP_PREFIX_RT_NOP) {
4329 cleanup_prefix_route(ifp, rt_expires,
4330 action == CLEANUP_PREFIX_RT_DEL);
4331 }
761aac73 4332 }
53bd6749
JP		 4333
4334 if (was_managetempaddr || ifp->flags & IFA_F_MANAGETEMPADDR) {
4335 if (was_managetempaddr && !(ifp->flags & IFA_F_MANAGETEMPADDR))
4336 valid_lft = prefered_lft = 0;
4337 manage_tempaddrs(ifp->idev, ifp, valid_lft, prefered_lft,
4338 !was_managetempaddr, jiffies);
4339 }
4340
c15b1cca 4341 addrconf_verify_rtnl();
081bba5b
NT		 4342
4343 return 0;
4344}
4345
1da177e4 4346static int
661d2967 4347inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh)
1da177e4 4348{
3b1e0a65 4349 struct net *net = sock_net(skb->sk);
461d8837
TG		 4350 struct ifaddrmsg *ifm;
4351 struct nlattr *tb[IFA_MAX+1];
caeaba79 4352 struct in6_addr *pfx, *peer_pfx;
7198f8ce
TG		 4353 struct inet6_ifaddr *ifa;
4354 struct net_device *dev;
55ebaef1 4355 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
479840ff 4356 u32 ifa_flags;
461d8837 4357 int err;
1da177e4 4358
461d8837
TG		 4359 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
4360 if (err < 0)
4361 return err;
4362
4363 ifm = nlmsg_data(nlh);
caeaba79 4364 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
63159f29 4365 if (!pfx)
1da177e4
LT		 4366 return -EINVAL;
4367
461d8837 4368 if (tb[IFA_CACHEINFO]) {
0778769d 4369 struct ifa_cacheinfo *ci;
461d8837
TG		 4370
4371 ci = nla_data(tb[IFA_CACHEINFO]);
0778769d 4372 valid_lft = ci->ifa_valid;
461d8837
TG		 4373 preferred_lft = ci->ifa_prefered;
4374 } else {
4375 preferred_lft = INFINITY_LIFE_TIME;
4376 valid_lft = INFINITY_LIFE_TIME;
0778769d
NT		 4377 }
4378
af284937 4379 dev = __dev_get_by_index(net, ifm->ifa_index);
63159f29 4380 if (!dev)
7198f8ce
TG		 4381 return -ENODEV;
4382
479840ff
JP		 4383 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
4384
55ebaef1 4385 /* We ignore other flags so far. */
761aac73 4386 ifa_flags &= IFA_F_NODAD | IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
93a714d6 4387 IFA_F_NOPREFIXROUTE | IFA_F_MCAUTOJOIN;
55ebaef1 4388
1cab3da6 4389 ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
63159f29 4390 if (!ifa) {
7198f8ce
TG		 4391 /*
4392 * It would be best to check for !NLM_F_CREATE here but
db9c7c39 4393 * userspace already relies on not having to provide this.
7198f8ce 4394 */
caeaba79 4395 return inet6_addr_add(net, ifm->ifa_index, pfx, peer_pfx,
af284937
DL		 4396 ifm->ifa_prefixlen, ifa_flags,
4397 preferred_lft, valid_lft);
081bba5b
NT		 4398 }
4399
7198f8ce
TG		 4400 if (nlh->nlmsg_flags & NLM_F_EXCL ||
4401 !(nlh->nlmsg_flags & NLM_F_REPLACE))
4402 err = -EEXIST;
4403 else
55ebaef1 4404 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
7198f8ce
TG		 4405
4406 in6_ifa_put(ifa);
4407
4408 return err;
1da177e4
LT		 4409}
4410
479840ff 4411static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u32 flags,
101bb229
TG		 4412 u8 scope, int ifindex)
4413{
4414 struct ifaddrmsg *ifm;
4415
4416 ifm = nlmsg_data(nlh);
4417 ifm->ifa_family = AF_INET6;
4418 ifm->ifa_prefixlen = prefixlen;
4419 ifm->ifa_flags = flags;
4420 ifm->ifa_scope = scope;
4421 ifm->ifa_index = ifindex;
4422}
4423
85486af0
TG		 4424static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
4425 unsigned long tstamp, u32 preferred, u32 valid)
4426{
4427 struct ifa_cacheinfo ci;
4428
18a31e1e
TG		 4429 ci.cstamp = cstamp_delta(cstamp);
4430 ci.tstamp = cstamp_delta(tstamp);
85486af0
TG		 4431 ci.ifa_prefered = preferred;
4432 ci.ifa_valid = valid;
4433
4434 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
4435}
4436
101bb229
TG		 4437static inline int rt_scope(int ifa_scope)
4438{
4439 if (ifa_scope & IFA_HOST)
4440 return RT_SCOPE_HOST;
4441 else if (ifa_scope & IFA_LINK)
4442 return RT_SCOPE_LINK;
4443 else if (ifa_scope & IFA_SITE)
4444 return RT_SCOPE_SITE;
4445 else
4446 return RT_SCOPE_UNIVERSE;
4447}
4448
0ab6803b
TG		 4449static inline int inet6_ifaddr_msgsize(void)
4450{
339bf98f 4451 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
caeaba79 4452 + nla_total_size(16) /* IFA_LOCAL */
339bf98f 4453 + nla_total_size(16) /* IFA_ADDRESS */
479840ff
JP		 4454 + nla_total_size(sizeof(struct ifa_cacheinfo))
4455 + nla_total_size(4) /* IFA_FLAGS */;
0ab6803b 4456}
c5396a31 4457
1da177e4 4458static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
15e47304 4459 u32 portid, u32 seq, int event, unsigned int flags)
1da177e4 4460{
1da177e4 4461 struct nlmsghdr *nlh;
85486af0 4462 u32 preferred, valid;
1da177e4 4463
15e47304 4464 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
63159f29 4465 if (!nlh)
26932566 4466 return -EMSGSIZE;
0ab6803b 4467
101bb229
TG		 4468 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
4469 ifa->idev->dev->ifindex);
4470
fad8da3e
YA		 4471 if (!((ifa->flags&IFA_F_PERMANENT) &&
4472 (ifa->prefered_lft == INFINITY_LIFE_TIME))) {
85486af0
TG		 4473 preferred = ifa->prefered_lft;
4474 valid = ifa->valid_lft;
4475 if (preferred != INFINITY_LIFE_TIME) {
1da177e4 4476 long tval = (jiffies - ifa->tstamp)/HZ;
a1faa698
JR		 4477 if (preferred > tval)
4478 preferred -= tval;
4479 else
4480 preferred = 0;
f56619fc
BH		 4481 if (valid != INFINITY_LIFE_TIME) {
4482 if (valid > tval)
4483 valid -= tval;
4484 else
4485 valid = 0;
4486 }
1da177e4
LT		 4487 }
4488 } else {
85486af0
TG		 4489 preferred = INFINITY_LIFE_TIME;
4490 valid = INFINITY_LIFE_TIME;
4491 }
4492
7996c799 4493 if (!ipv6_addr_any(&ifa->peer_addr)) {
930345ea
JB		 4494 if (nla_put_in6_addr(skb, IFA_LOCAL, &ifa->addr) < 0 ||
4495 nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->peer_addr) < 0)
caeaba79
ND		 4496 goto error;
4497 } else
930345ea 4498 if (nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->addr) < 0)
caeaba79
ND		 4499 goto error;
4500
4501 if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0)
4502 goto error;
1da177e4 4503
479840ff
JP		 4504 if (nla_put_u32(skb, IFA_FLAGS, ifa->flags) < 0)
4505 goto error;
4506
053c095a
JB		 4507 nlmsg_end(skb, nlh);
4508 return 0;
caeaba79
ND		 4509
4510error:
4511 nlmsg_cancel(skb, nlh);
4512 return -EMSGSIZE;
1da177e4
LT		 4513}
4514
4515static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
15e47304 4516 u32 portid, u32 seq, int event, u16 flags)
1da177e4 4517{
1da177e4 4518 struct nlmsghdr *nlh;
101bb229
TG		 4519 u8 scope = RT_SCOPE_UNIVERSE;
4520 int ifindex = ifmca->idev->dev->ifindex;
4521
4522 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
4523 scope = RT_SCOPE_SITE;
1da177e4 4524
15e47304 4525 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
63159f29 4526 if (!nlh)
26932566 4527 return -EMSGSIZE;
85486af0 4528
0ab6803b 4529 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
930345ea 4530 if (nla_put_in6_addr(skb, IFA_MULTICAST, &ifmca->mca_addr) < 0 ||
0ab6803b 4531 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
26932566
PM		 4532 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
4533 nlmsg_cancel(skb, nlh);
4534 return -EMSGSIZE;
4535 }
85486af0 4536
053c095a
JB		 4537 nlmsg_end(skb, nlh);
4538 return 0;
1da177e4
LT		 4539}
4540
4541static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
15e47304 4542 u32 portid, u32 seq, int event, unsigned int flags)
1da177e4 4543{
1da177e4 4544 struct nlmsghdr *nlh;
101bb229
TG		 4545 u8 scope = RT_SCOPE_UNIVERSE;
4546 int ifindex = ifaca->aca_idev->dev->ifindex;
4547
4548 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
4549 scope = RT_SCOPE_SITE;
1da177e4 4550
15e47304 4551 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
63159f29 4552 if (!nlh)
26932566 4553 return -EMSGSIZE;
85486af0 4554
0ab6803b 4555 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
930345ea 4556 if (nla_put_in6_addr(skb, IFA_ANYCAST, &ifaca->aca_addr) < 0 ||
0ab6803b 4557 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
26932566
PM		 4558 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
4559 nlmsg_cancel(skb, nlh);
4560 return -EMSGSIZE;
4561 }
1da177e4 4562
053c095a
JB		 4563 nlmsg_end(skb, nlh);
4564 return 0;
1da177e4
LT		 4565}
4566
e21e8467 4567enum addr_type_t {
1da177e4
LT		 4568 UNICAST_ADDR,
4569 MULTICAST_ADDR,
4570 ANYCAST_ADDR,
4571};
4572
234b27c3
ED		 4573/* called with rcu_read_lock() */
4574static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
4575 struct netlink_callback *cb, enum addr_type_t type,
4576 int s_ip_idx, int *p_ip_idx)
4577{
234b27c3
ED		 4578 struct ifmcaddr6 *ifmca;
4579 struct ifacaddr6 *ifaca;
4580 int err = 1;
4581 int ip_idx = *p_ip_idx;
4582
4583 read_lock_bh(&idev->lock);
4584 switch (type) {
502a2ffd 4585 case UNICAST_ADDR: {
4586 struct inet6_ifaddr *ifa;
4587
234b27c3 4588 /* unicast address incl. temp addr */
502a2ffd 4589 list_for_each_entry(ifa, &idev->addr_list, if_list) {
4590 if (++ip_idx < s_ip_idx)
234b27c3
ED		 4591 continue;
4592 err = inet6_fill_ifaddr(skb, ifa,
15e47304 4593 NETLINK_CB(cb->skb).portid,
234b27c3
ED		 4594 cb->nlh->nlmsg_seq,
4595 RTM_NEWADDR,
4596 NLM_F_MULTI);
053c095a 4597 if (err < 0)
234b27c3 4598 break;
63998ac2 4599 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
234b27c3
ED		 4600 }
4601 break;
502a2ffd 4602 }
234b27c3
ED		 4603 case MULTICAST_ADDR:
4604 /* multicast address */
4605 for (ifmca = idev->mc_list; ifmca;
4606 ifmca = ifmca->next, ip_idx++) {
4607 if (ip_idx < s_ip_idx)
4608 continue;
4609 err = inet6_fill_ifmcaddr(skb, ifmca,
15e47304 4610 NETLINK_CB(cb->skb).portid,
234b27c3
ED		 4611 cb->nlh->nlmsg_seq,
4612 RTM_GETMULTICAST,
4613 NLM_F_MULTI);
053c095a 4614 if (err < 0)
234b27c3
ED		 4615 break;
4616 }
4617 break;
4618 case ANYCAST_ADDR:
4619 /* anycast address */
4620 for (ifaca = idev->ac_list; ifaca;
4621 ifaca = ifaca->aca_next, ip_idx++) {
4622 if (ip_idx < s_ip_idx)
4623 continue;
4624 err = inet6_fill_ifacaddr(skb, ifaca,
15e47304 4625 NETLINK_CB(cb->skb).portid,
234b27c3
ED		 4626 cb->nlh->nlmsg_seq,
4627 RTM_GETANYCAST,
4628 NLM_F_MULTI);
053c095a 4629 if (err < 0)
234b27c3
ED		 4630 break;
4631 }
4632 break;
4633 default:
4634 break;
4635 }
4636 read_unlock_bh(&idev->lock);
4637 *p_ip_idx = ip_idx;
4638 return err;
4639}
4640
1da177e4
LT		 4641static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
4642 enum addr_type_t type)
4643{
234b27c3
ED		 4644 struct net *net = sock_net(skb->sk);
4645 int h, s_h;
1da177e4
LT		 4646 int idx, ip_idx;
4647 int s_idx, s_ip_idx;
1da177e4 4648 struct net_device *dev;
234b27c3
ED		 4649 struct inet6_dev *idev;
4650 struct hlist_head *head;
1ab1457c 4651
234b27c3
ED		 4652 s_h = cb->args[0];
4653 s_idx = idx = cb->args[1];
4654 s_ip_idx = ip_idx = cb->args[2];
5d5619b4 4655
234b27c3 4656 rcu_read_lock();
63998ac2 4657 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ net->dev_base_seq;
234b27c3
ED		 4658 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4659 idx = 0;
4660 head = &net->dev_index_head[h];
b67bfe0d 4661 hlist_for_each_entry_rcu(dev, head, index_hlist) {
234b27c3
ED		 4662 if (idx < s_idx)
4663 goto cont;
4b97efdf 4664 if (h > s_h || idx > s_idx)
234b27c3
ED		 4665 s_ip_idx = 0;
4666 ip_idx = 0;
e21e8467
SH		 4667 idev = __in6_dev_get(dev);
4668 if (!idev)
234b27c3
ED		 4669 goto cont;
4670
4671 if (in6_dump_addrs(idev, skb, cb, type,
7b46a644 4672 s_ip_idx, &ip_idx) < 0)
234b27c3 4673 goto done;
7562f876 4674cont:
234b27c3
ED		 4675 idx++;
4676 }
1da177e4 4677 }
234b27c3
ED		 4678done:
4679 rcu_read_unlock();
4680 cb->args[0] = h;
4681 cb->args[1] = idx;
4682 cb->args[2] = ip_idx;
4683
1da177e4
LT		 4684 return skb->len;
4685}
4686
4687static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
4688{
4689 enum addr_type_t type = UNICAST_ADDR;
b854272b 4690
1da177e4
LT		 4691 return inet6_dump_addr(skb, cb, type);
4692}
4693
4694static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
4695{
4696 enum addr_type_t type = MULTICAST_ADDR;
b854272b 4697
1da177e4
LT		 4698 return inet6_dump_addr(skb, cb, type);
4699}
4700
4701
4702static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
4703{
4704 enum addr_type_t type = ANYCAST_ADDR;
b854272b 4705
1da177e4
LT		 4706 return inet6_dump_addr(skb, cb, type);
4707}
4708
661d2967 4709static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh)
6c223828 4710{
3b1e0a65 4711 struct net *net = sock_net(in_skb->sk);
1b29fc2c
TG		 4712 struct ifaddrmsg *ifm;
4713 struct nlattr *tb[IFA_MAX+1];
caeaba79 4714 struct in6_addr *addr = NULL, *peer;
6c223828
NT		 4715 struct net_device *dev = NULL;
4716 struct inet6_ifaddr *ifa;
4717 struct sk_buff *skb;
6c223828
NT		 4718 int err;
4719
1b29fc2c
TG		 4720 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
4721 if (err < 0)
4722 goto errout;
4723
caeaba79 4724 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer);
63159f29 4725 if (!addr) {
1b29fc2c
TG		 4726 err = -EINVAL;
4727 goto errout;
6c223828 4728 }
6c223828 4729
1b29fc2c 4730 ifm = nlmsg_data(nlh);
6c223828 4731 if (ifm->ifa_index)
6fda7350 4732 dev = __dev_get_by_index(net, ifm->ifa_index);
6c223828 4733
e21e8467
SH		 4734 ifa = ipv6_get_ifaddr(net, addr, dev, 1);
4735 if (!ifa) {
1b29fc2c
TG		 4736 err = -EADDRNOTAVAIL;
4737 goto errout;
4738 }
6c223828 4739
e21e8467
SH		 4740 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
4741 if (!skb) {
6c223828 4742 err = -ENOBUFS;
1b29fc2c 4743 goto errout_ifa;
6c223828
NT		 4744 }
4745
15e47304 4746 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).portid,
6c223828 4747 nlh->nlmsg_seq, RTM_NEWADDR, 0);
26932566
PM		 4748 if (err < 0) {
4749 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4750 WARN_ON(err == -EMSGSIZE);
4751 kfree_skb(skb);
4752 goto errout_ifa;
4753 }
15e47304 4754 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
1b29fc2c 4755errout_ifa:
6c223828 4756 in6_ifa_put(ifa);
1b29fc2c 4757errout:
6c223828 4758 return err;
6c223828
NT		 4759}
4760
1da177e4
LT		 4761static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
4762{
4763 struct sk_buff *skb;
c346dca1 4764 struct net *net = dev_net(ifa->idev->dev);
5d620266 4765 int err = -ENOBUFS;
1da177e4 4766
0ab6803b 4767 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
63159f29 4768 if (!skb)
5d620266
TG		 4769 goto errout;
4770
4771 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
26932566
PM		 4772 if (err < 0) {
4773 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4774 WARN_ON(err == -EMSGSIZE);
4775 kfree_skb(skb);
4776 goto errout;
4777 }
1ce85fe4
PNA		 4778 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
4779 return;
5d620266
TG		 4780errout:
4781 if (err < 0)
6fda7350 4782 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
1da177e4
LT		 4783}
4784
b6f99a21 4785static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
1da177e4
LT		 4786 __s32 *array, int bytes)
4787{
04561c1f
TG		 4788 BUG_ON(bytes < (DEVCONF_MAX * 4));
4789
1da177e4
LT		 4790 memset(array, 0, bytes);
4791 array[DEVCONF_FORWARDING] = cnf->forwarding;
4792 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
4793 array[DEVCONF_MTU6] = cnf->mtu6;
4794 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
4795 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
4796 array[DEVCONF_AUTOCONF] = cnf->autoconf;
4797 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
4798 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
93908d19
TG		 4799 array[DEVCONF_RTR_SOLICIT_INTERVAL] =
4800 jiffies_to_msecs(cnf->rtr_solicit_interval);
4801 array[DEVCONF_RTR_SOLICIT_DELAY] =
4802 jiffies_to_msecs(cnf->rtr_solicit_delay);
1da177e4 4803 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
fc4eba58
HFS		 4804 array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] =
4805 jiffies_to_msecs(cnf->mldv1_unsolicited_report_interval);
4806 array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] =
4807 jiffies_to_msecs(cnf->mldv2_unsolicited_report_interval);
1da177e4
LT		 4808 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
4809 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
4810 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
4811 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
4812 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
1da177e4 4813 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
65f5c7c1 4814 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
8013d1d7 4815 array[DEVCONF_ACCEPT_RA_MIN_HOP_LIMIT] = cnf->accept_ra_min_hop_limit;
c4fd30eb 4816 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
930d6ff2
YH		 4817#ifdef CONFIG_IPV6_ROUTER_PREF
4818 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
93908d19
TG		 4819 array[DEVCONF_RTR_PROBE_INTERVAL] =
4820 jiffies_to_msecs(cnf->rtr_probe_interval);
fa03ef38 4821#ifdef CONFIG_IPV6_ROUTE_INFO
09c884d4
YH		 4822 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
4823#endif
930d6ff2 4824#endif
fbea49e1 4825 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
0bcbc926 4826 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
95c385b4
NH		 4827#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4828 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
7fd2561e 4829 array[DEVCONF_USE_OPTIMISTIC] = cnf->use_optimistic;
95c385b4 4830#endif
7bc570c8
YH		 4831#ifdef CONFIG_IPV6_MROUTE
4832 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
4833#endif
778d80be 4834 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
1b34be74 4835 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
c3faca05 4836 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
5cb04436 4837 array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify;
b800c3b9 4838 array[DEVCONF_SUPPRESS_FRAG_NDISC] = cnf->suppress_frag_ndisc;
d9333196 4839 array[DEVCONF_ACCEPT_RA_FROM_LOCAL] = cnf->accept_ra_from_local;
c2943f14 4840 array[DEVCONF_ACCEPT_RA_MTU] = cnf->accept_ra_mtu;
35103d11 4841 array[DEVCONF_IGNORE_ROUTES_WITH_LINKDOWN] = cnf->ignore_routes_with_linkdown;
3d1bec99 4842 /* we omit DEVCONF_STABLE_SECRET for now */
3985e8a3 4843 array[DEVCONF_USE_OIF_ADDRS_ONLY] = cnf->use_oif_addrs_only;
abbc3043 4844 array[DEVCONF_DROP_UNICAST_IN_L2_MULTICAST] = cnf->drop_unicast_in_l2_multicast;
7a02bf89 4845 array[DEVCONF_DROP_UNSOLICITED_NA] = cnf->drop_unsolicited_na;
f1705ec1 4846 array[DEVCONF_KEEP_ADDR_ON_DOWN] = cnf->keep_addr_on_down;
1da177e4
LT		 4847}
4848
b382b191
TG		 4849static inline size_t inet6_ifla6_size(void)
4850{
4851 return nla_total_size(4) /* IFLA_INET6_FLAGS */
4852 + nla_total_size(sizeof(struct ifla_cacheinfo))
4853 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
4854 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
f53adae4
DB		 4855 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
4856 + nla_total_size(sizeof(struct in6_addr)); /* IFLA_INET6_TOKEN */
b382b191
TG		 4857}
4858
339bf98f
TG		 4859static inline size_t inet6_if_nlmsg_size(void)
4860{
4861 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
4862 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
4863 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
4864 + nla_total_size(4) /* IFLA_MTU */
4865 + nla_total_size(4) /* IFLA_LINK */
0344338b 4866 + nla_total_size(1) /* IFLA_OPERSTATE */
b382b191 4867 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */
339bf98f 4868}
c5396a31 4869
be281e55 4870static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib,
7d720c3e 4871 int items, int bytes)
7f7d9a6b
HX		 4872{
4873 int i;
4874 int pad = bytes - sizeof(u64) * items;
4875 BUG_ON(pad < 0);
4876
4877 /* Use put_unaligned() because stats may not be aligned for u64. */
4878 put_unaligned(items, &stats[0]);
4879 for (i = 1; i < items; i++)
be281e55 4880 put_unaligned(atomic_long_read(&mib[i]), &stats[i]);
7f7d9a6b
HX		 4881
4882 memset(&stats[items], 0, pad);
4883}
4884
698365fa 4885static inline void __snmp6_fill_stats64(u64 *stats, void __percpu *mib,
a3a77372 4886 int bytes, size_t syncpoff)
4ce3c183 4887{
a3a77372
R		 4888 int i, c;
4889 u64 buff[IPSTATS_MIB_MAX];
4890 int pad = bytes - sizeof(u64) * IPSTATS_MIB_MAX;
4891
4ce3c183
ED		 4892 BUG_ON(pad < 0);
4893
a3a77372
R		 4894 memset(buff, 0, sizeof(buff));
4895 buff[0] = IPSTATS_MIB_MAX;
4ce3c183 4896
a3a77372
R		 4897 for_each_possible_cpu(c) {
4898 for (i = 1; i < IPSTATS_MIB_MAX; i++)
4899 buff[i] += snmp_get_cpu_field64(mib, c, i, syncpoff);
4900 }
4901
4902 memcpy(stats, buff, IPSTATS_MIB_MAX * sizeof(u64));
4903 memset(&stats[IPSTATS_MIB_MAX], 0, pad);
4ce3c183
ED		 4904}
4905
7f7d9a6b
HX		 4906static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
4907 int bytes)
4908{
e21e8467 4909 switch (attrtype) {
7f7d9a6b 4910 case IFLA_INET6_STATS:
a3a77372
R		 4911 __snmp6_fill_stats64(stats, idev->stats.ipv6, bytes,
4912 offsetof(struct ipstats_mib, syncp));
7f7d9a6b
HX		 4913 break;
4914 case IFLA_INET6_ICMP6STATS:
be281e55 4915 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, ICMP6_MIB_MAX, bytes);
7f7d9a6b
HX		 4916 break;
4917 }
4918}
4919
d5566fd7
SV		 4920static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev,
4921 u32 ext_filter_mask)
b382b191
TG		 4922{
4923 struct nlattr *nla;
4924 struct ifla_cacheinfo ci;
4925
c78679e8
DM		 4926 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags))
4927 goto nla_put_failure;
b382b191 4928 ci.max_reasm_len = IPV6_MAXPLEN;
24912420
DM		 4929 ci.tstamp = cstamp_delta(idev->tstamp);
4930 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time);
1f9248e5 4931 ci.retrans_time = jiffies_to_msecs(NEIGH_VAR(idev->nd_parms, RETRANS_TIME));
c78679e8
DM		 4932 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci))
4933 goto nla_put_failure;
b382b191 4934 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
63159f29 4935 if (!nla)
b382b191
TG		 4936 goto nla_put_failure;
4937 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
4938
4939 /* XXX - MC not implemented */
4940
d5566fd7
SV		 4941 if (ext_filter_mask & RTEXT_FILTER_SKIP_STATS)
4942 return 0;
4943
b382b191 4944 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
63159f29 4945 if (!nla)
b382b191
TG		 4946 goto nla_put_failure;
4947 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
4948
4949 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
63159f29 4950 if (!nla)
b382b191
TG		 4951 goto nla_put_failure;
4952 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
4953
f53adae4 4954 nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr));
63159f29 4955 if (!nla)
f53adae4 4956 goto nla_put_failure;
bc91b0f0
JP		 4957
4958 if (nla_put_u8(skb, IFLA_INET6_ADDR_GEN_MODE, idev->addr_gen_mode))
4959 goto nla_put_failure;
4960
f53adae4
DB		 4961 read_lock_bh(&idev->lock);
4962 memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla));
4963 read_unlock_bh(&idev->lock);
4964
b382b191
TG		 4965 return 0;
4966
4967nla_put_failure:
4968 return -EMSGSIZE;
4969}
4970
b1974ed0
AR		 4971static size_t inet6_get_link_af_size(const struct net_device *dev,
4972 u32 ext_filter_mask)
b382b191
TG		 4973{
4974 if (!__in6_dev_get(dev))
4975 return 0;
4976
4977 return inet6_ifla6_size();
4978}
4979
d5566fd7
SV		 4980static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev,
4981 u32 ext_filter_mask)
b382b191
TG		 4982{
4983 struct inet6_dev *idev = __in6_dev_get(dev);
4984
4985 if (!idev)
4986 return -ENODATA;
4987
d5566fd7 4988 if (inet6_fill_ifla6_attrs(skb, idev, ext_filter_mask) < 0)
b382b191
TG		 4989 return -EMSGSIZE;
4990
4991 return 0;
4992}
4993
f53adae4
DB		 4994static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token)
4995{
f53adae4
DB		 4996 struct inet6_ifaddr *ifp;
4997 struct net_device *dev = idev->dev;
47e27d5e 4998 bool clear_token, update_rs = false;
dc848292 4999 struct in6_addr ll_addr;
f53adae4 5000
c15b1cca
HFS		 5001 ASSERT_RTNL();
5002
63159f29 5003 if (!token)
f53adae4 5004 return -EINVAL;
f53adae4
DB		 5005 if (dev->flags & (IFF_LOOPBACK | IFF_NOARP))
5006 return -EINVAL;
f53adae4
DB		 5007 if (!ipv6_accept_ra(idev))
5008 return -EINVAL;
5009 if (idev->cnf.rtr_solicits <= 0)
5010 return -EINVAL;
5011
5012 write_lock_bh(&idev->lock);
5013
5014 BUILD_BUG_ON(sizeof(token->s6_addr) != 16);
5015 memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8);
5016
5017 write_unlock_bh(&idev->lock);
5018
47e27d5e
DB		 5019 clear_token = ipv6_addr_any(token);
5020 if (clear_token)
5021 goto update_lft;
5022
dc848292
HFS		 5023 if (!idev->dead && (idev->if_flags & IF_READY) &&
5024 !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE |
5025 IFA_F_OPTIMISTIC)) {
fc403832
DB		 5026 /* If we're not ready, then normal ifup will take care
5027 * of this. Otherwise, we need to request our rs here.
5028 */
5029 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters);
5030 update_rs = true;
5031 }
f53adae4 5032
47e27d5e 5033update_lft:
f53adae4 5034 write_lock_bh(&idev->lock);
fc403832 5035
77ecaace 5036 if (update_rs) {
fc403832 5037 idev->if_flags |= IF_RS_SENT;
77ecaace
HFS		 5038 idev->rs_probes = 1;
5039 addrconf_mod_rs_timer(idev, idev->cnf.rtr_solicit_interval);
5040 }
f53adae4
DB		 5041
5042 /* Well, that's kinda nasty ... */
5043 list_for_each_entry(ifp, &idev->addr_list, if_list) {
5044 spin_lock(&ifp->lock);
617fe29d 5045 if (ifp->tokenized) {
f53adae4
DB		 5046 ifp->valid_lft = 0;
5047 ifp->prefered_lft = 0;
5048 }
5049 spin_unlock(&ifp->lock);
5050 }
5051
5052 write_unlock_bh(&idev->lock);
b2ed64a9 5053 inet6_ifinfo_notify(RTM_NEWLINK, idev);
c15b1cca 5054 addrconf_verify_rtnl();
f53adae4
DB		 5055 return 0;
5056}
5057
11b1f828
DB		 5058static const struct nla_policy inet6_af_policy[IFLA_INET6_MAX + 1] = {
5059 [IFLA_INET6_ADDR_GEN_MODE] = { .type = NLA_U8 },
5060 [IFLA_INET6_TOKEN] = { .len = sizeof(struct in6_addr) },
5061};
5062
5063static int inet6_validate_link_af(const struct net_device *dev,
5064 const struct nlattr *nla)
5065{
5066 struct nlattr *tb[IFLA_INET6_MAX + 1];
5067
5068 if (dev && !__in6_dev_get(dev))
5069 return -EAFNOSUPPORT;
5070
5071 return nla_parse_nested(tb, IFLA_INET6_MAX, nla, inet6_af_policy);
5072}
5073
f53adae4
DB		 5074static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla)
5075{
5076 int err = -EINVAL;
5077 struct inet6_dev *idev = __in6_dev_get(dev);
5078 struct nlattr *tb[IFLA_INET6_MAX + 1];
5079
5080 if (!idev)
5081 return -EAFNOSUPPORT;
5082
5083 if (nla_parse_nested(tb, IFLA_INET6_MAX, nla, NULL) < 0)
5084 BUG();
5085
bc91b0f0 5086 if (tb[IFLA_INET6_TOKEN]) {
f53adae4 5087 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN]));
bc91b0f0
JP		 5088 if (err)
5089 return err;
5090 }
5091
5092 if (tb[IFLA_INET6_ADDR_GEN_MODE]) {
5093 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]);
5094
5095 if (mode != IN6_ADDR_GEN_MODE_EUI64 &&
622c81d5 5096 mode != IN6_ADDR_GEN_MODE_NONE &&
cc9da6cc
BM		 5097 mode != IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
5098 mode != IN6_ADDR_GEN_MODE_RANDOM)
622c81d5
HFS		 5099 return -EINVAL;
5100
5101 if (mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
5102 !idev->cnf.stable_secret.initialized &&
5103 !dev_net(dev)->ipv6.devconf_dflt->stable_secret.initialized)
bc91b0f0 5104 return -EINVAL;
622c81d5 5105
bc91b0f0
JP		 5106 idev->addr_gen_mode = mode;
5107 err = 0;
5108 }
f53adae4
DB		 5109
5110 return err;
5111}
5112
1ab1457c 5113static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
15e47304 5114 u32 portid, u32 seq, int event, unsigned int flags)
1da177e4 5115{
04561c1f 5116 struct net_device *dev = idev->dev;
04561c1f
TG		 5117 struct ifinfomsg *hdr;
5118 struct nlmsghdr *nlh;
5119 void *protoinfo;
04561c1f 5120
15e47304 5121 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags);
63159f29 5122 if (!nlh)
26932566 5123 return -EMSGSIZE;
04561c1f
TG		 5124
5125 hdr = nlmsg_data(nlh);
5126 hdr->ifi_family = AF_INET6;
5127 hdr->__ifi_pad = 0;
5128 hdr->ifi_type = dev->type;
5129 hdr->ifi_index = dev->ifindex;
5130 hdr->ifi_flags = dev_get_flags(dev);
5131 hdr->ifi_change = 0;
5132
c78679e8
DM		 5133 if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
5134 (dev->addr_len &&
5135 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
5136 nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
a54acb3a 5137 (dev->ifindex != dev_get_iflink(dev) &&
0344338b
AG		 5138 nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))) ||
5139 nla_put_u8(skb, IFLA_OPERSTATE,
5140 netif_running(dev) ? dev->operstate : IF_OPER_DOWN))
c78679e8 5141 goto nla_put_failure;
04561c1f 5142 protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
63159f29 5143 if (!protoinfo)
04561c1f 5144 goto nla_put_failure;
1da177e4 5145
d5566fd7 5146 if (inet6_fill_ifla6_attrs(skb, idev, 0) < 0)
bf99f1bd 5147 goto nla_put_failure;
1da177e4 5148
04561c1f 5149 nla_nest_end(skb, protoinfo);
053c095a
JB		 5150 nlmsg_end(skb, nlh);
5151 return 0;
1da177e4 5152
04561c1f 5153nla_put_failure:
26932566
PM		 5154 nlmsg_cancel(skb, nlh);
5155 return -EMSGSIZE;
1da177e4
LT		 5156}
5157
5158static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
5159{
3b1e0a65 5160 struct net *net = sock_net(skb->sk);
84d2697d 5161 int h, s_h;
434a8a58 5162 int idx = 0, s_idx;
1da177e4
LT		 5163 struct net_device *dev;
5164 struct inet6_dev *idev;
84d2697d 5165 struct hlist_head *head;
1da177e4 5166
84d2697d
ED		 5167 s_h = cb->args[0];
5168 s_idx = cb->args[1];
5169
5170 rcu_read_lock();
5171 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
5172 idx = 0;
5173 head = &net->dev_index_head[h];
b67bfe0d 5174 hlist_for_each_entry_rcu(dev, head, index_hlist) {
84d2697d
ED		 5175 if (idx < s_idx)
5176 goto cont;
5177 idev = __in6_dev_get(dev);
5178 if (!idev)
5179 goto cont;
5180 if (inet6_fill_ifinfo(skb, idev,
15e47304 5181 NETLINK_CB(cb->skb).portid,
84d2697d 5182 cb->nlh->nlmsg_seq,
053c095a 5183 RTM_NEWLINK, NLM_F_MULTI) < 0)
84d2697d 5184 goto out;
7562f876 5185cont:
84d2697d
ED		 5186 idx++;
5187 }
1da177e4 5188 }
84d2697d
ED		 5189out:
5190 rcu_read_unlock();
5191 cb->args[1] = idx;
5192 cb->args[0] = h;
1da177e4
LT		 5193
5194 return skb->len;
5195}
5196
5197void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
5198{
5199 struct sk_buff *skb;
c346dca1 5200 struct net *net = dev_net(idev->dev);
8d7a76c9 5201 int err = -ENOBUFS;
1ab1457c 5202
339bf98f 5203 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
63159f29 5204 if (!skb)
8d7a76c9
TG		 5205 goto errout;
5206
5207 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
26932566
PM		 5208 if (err < 0) {
5209 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
5210 WARN_ON(err == -EMSGSIZE);
5211 kfree_skb(skb);
5212 goto errout;
5213 }
5f75a104 5214 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC);
1ce85fe4 5215 return;
8d7a76c9
TG		 5216errout:
5217 if (err < 0)
5f75a104 5218 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err);
1da177e4
LT		 5219}
5220
339bf98f
TG		 5221static inline size_t inet6_prefix_nlmsg_size(void)
5222{
5223 return NLMSG_ALIGN(sizeof(struct prefixmsg))
5224 + nla_total_size(sizeof(struct in6_addr))
5225 + nla_total_size(sizeof(struct prefix_cacheinfo));
5226}
c5396a31 5227
1da177e4 5228static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
15e47304 5229 struct prefix_info *pinfo, u32 portid, u32 seq,
6051e2f4 5230 int event, unsigned int flags)
1da177e4 5231{
6051e2f4
TG		 5232 struct prefixmsg *pmsg;
5233 struct nlmsghdr *nlh;
1da177e4
LT		 5234 struct prefix_cacheinfo ci;
5235
15e47304 5236 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags);
63159f29 5237 if (!nlh)
26932566 5238 return -EMSGSIZE;
6051e2f4
TG		 5239
5240 pmsg = nlmsg_data(nlh);
1da177e4 5241 pmsg->prefix_family = AF_INET6;
8a47077a
PM		 5242 pmsg->prefix_pad1 = 0;
5243 pmsg->prefix_pad2 = 0;
1da177e4
LT		 5244 pmsg->prefix_ifindex = idev->dev->ifindex;
5245 pmsg->prefix_len = pinfo->prefix_len;
5246 pmsg->prefix_type = pinfo->type;
8a47077a 5247 pmsg->prefix_pad3 = 0;
1da177e4
LT		 5248 pmsg->prefix_flags = 0;
5249 if (pinfo->onlink)
5250 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
5251 if (pinfo->autoconf)
5252 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
5253
c78679e8
DM		 5254 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix))
5255 goto nla_put_failure;
1da177e4
LT		 5256 ci.preferred_time = ntohl(pinfo->prefered);
5257 ci.valid_time = ntohl(pinfo->valid);
c78679e8
DM		 5258 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci))
5259 goto nla_put_failure;
053c095a
JB		 5260 nlmsg_end(skb, nlh);
5261 return 0;
1da177e4 5262
6051e2f4 5263nla_put_failure:
26932566
PM		 5264 nlmsg_cancel(skb, nlh);
5265 return -EMSGSIZE;
1da177e4
LT		 5266}
5267
1ab1457c 5268static void inet6_prefix_notify(int event, struct inet6_dev *idev,
1da177e4
LT		 5269 struct prefix_info *pinfo)
5270{
5271 struct sk_buff *skb;
c346dca1 5272 struct net *net = dev_net(idev->dev);
8c384bfa 5273 int err = -ENOBUFS;
1da177e4 5274
339bf98f 5275 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
63159f29 5276 if (!skb)
8c384bfa
TG		 5277 goto errout;
5278
5279 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
26932566
PM		 5280 if (err < 0) {
5281 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
5282 WARN_ON(err == -EMSGSIZE);
5283 kfree_skb(skb);
5284 goto errout;
5285 }
1ce85fe4
PNA		 5286 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
5287 return;
8c384bfa
TG		 5288errout:
5289 if (err < 0)
6fda7350 5290 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
1da177e4
LT		 5291}
5292
1da177e4
LT		 5293static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
5294{
63998ac2
ND		 5295 struct net *net = dev_net(ifp->idev->dev);
5296
c15b1cca
HFS		 5297 if (event)
5298 ASSERT_RTNL();
5299
1da177e4
LT		 5300 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
5301
5302 switch (event) {
5303 case RTM_NEWADDR:
95c385b4
NH		 5304 /*
5305 * If the address was optimistic
5306 * we inserted the route at the start of
5307 * our DAD process, so we don't need
5308 * to do it again
5309 */
5310 if (!(ifp->rt->rt6i_node))
5311 ip6_ins_rt(ifp->rt);
1da177e4
LT		 5312 if (ifp->idev->cnf.forwarding)
5313 addrconf_join_anycast(ifp);
7996c799 5314 if (!ipv6_addr_any(&ifp->peer_addr))
caeaba79
ND		 5315 addrconf_prefix_route(&ifp->peer_addr, 128,
5316 ifp->idev->dev, 0, 0);
1da177e4
LT		 5317 break;
5318 case RTM_DELADDR:
5319 if (ifp->idev->cnf.forwarding)
5320 addrconf_leave_anycast(ifp);
5321 addrconf_leave_solict(ifp->idev, &ifp->addr);
7996c799 5322 if (!ipv6_addr_any(&ifp->peer_addr)) {
caeaba79 5323 struct rt6_info *rt;
caeaba79 5324
e7478dfc
ND		 5325 rt = addrconf_get_prefix_route(&ifp->peer_addr, 128,
5326 ifp->idev->dev, 0, 0);
8e3d5be7
MKL		 5327 if (rt)
5328 ip6_del_rt(rt);
caeaba79 5329 }
38bd10c4
DA		 5330 if (ifp->rt) {
5331 dst_hold(&ifp->rt->dst);
5332 ip6_del_rt(ifp->rt);
5333 }
705f1c86 5334 rt_genid_bump_ipv6(net);
1da177e4
LT		 5335 break;
5336 }
63998ac2 5337 atomic_inc(&net->ipv6.dev_addr_genid);
1da177e4
LT		 5338}
5339
5340static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
5341{
8814c4b5 5342 rcu_read_lock_bh();
1da177e4
LT		 5343 if (likely(ifp->idev->dead == 0))
5344 __ipv6_ifa_notify(event, ifp);
8814c4b5 5345 rcu_read_unlock_bh();
1da177e4
LT		 5346}
5347
5348#ifdef CONFIG_SYSCTL
5349
5350static
fe2c6338 5351int addrconf_sysctl_forward(struct ctl_table *ctl, int write,
1da177e4
LT		 5352 void __user *buffer, size_t *lenp, loff_t *ppos)
5353{
5354 int *valp = ctl->data;
5355 int val = *valp;
88af182e 5356 loff_t pos = *ppos;
fe2c6338 5357 struct ctl_table lctl;
1da177e4
LT		 5358 int ret;
5359
013d97e9
FR		 5360 /*
5361 * ctl->data points to idev->cnf.forwarding, we should
5362 * not modify it until we get the rtnl lock.
5363 */
5364 lctl = *ctl;
5365 lctl.data = &val;
5366
5367 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
1da177e4 5368
c8fecf22 5369 if (write)
b325fddb 5370 ret = addrconf_fixup_forwarding(ctl, valp, val);
88af182e
EB		 5371 if (ret)
5372 *ppos = pos;
1ab1457c 5373 return ret;
1da177e4
LT		 5374}
5375
d6df198d
PS		 5376static
5377int addrconf_sysctl_hop_limit(struct ctl_table *ctl, int write,
5378 void __user *buffer, size_t *lenp, loff_t *ppos)
5379{
5380 struct ctl_table lctl;
5381 int min_hl = 1, max_hl = 255;
5382
5383 lctl = *ctl;
5384 lctl.extra1 = &min_hl;
5385 lctl.extra2 = &max_hl;
5386
5387 return proc_dointvec_minmax(&lctl, write, buffer, lenp, ppos);
5388}
5389
77751427
ML		 5390static
5391int addrconf_sysctl_mtu(struct ctl_table *ctl, int write,
5392 void __user *buffer, size_t *lenp, loff_t *ppos)
5393{
5394 struct inet6_dev *idev = ctl->extra1;
5395 int min_mtu = IPV6_MIN_MTU;
5396 struct ctl_table lctl;
5397
5398 lctl = *ctl;
5399 lctl.extra1 = &min_mtu;
5400 lctl.extra2 = idev ? &idev->dev->mtu : NULL;
5401
5402 return proc_dointvec_minmax(&lctl, write, buffer, lenp, ppos);
5403}
5404
56d417b1
BH		 5405static void dev_disable_change(struct inet6_dev *idev)
5406{
75538c2b
CW		 5407 struct netdev_notifier_info info;
5408
56d417b1
BH		 5409 if (!idev || !idev->dev)
5410 return;
5411
75538c2b 5412 netdev_notifier_info_init(&info, idev->dev);
56d417b1 5413 if (idev->cnf.disable_ipv6)
75538c2b 5414 addrconf_notify(NULL, NETDEV_DOWN, &info);
56d417b1 5415 else
75538c2b 5416 addrconf_notify(NULL, NETDEV_UP, &info);
56d417b1
BH		 5417}
5418
5419static void addrconf_disable_change(struct net *net, __s32 newf)
5420{
5421 struct net_device *dev;
5422 struct inet6_dev *idev;
5423
c6d14c84
ED		 5424 rcu_read_lock();
5425 for_each_netdev_rcu(net, dev) {
56d417b1
BH		 5426 idev = __in6_dev_get(dev);
5427 if (idev) {
5428 int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
5429 idev->cnf.disable_ipv6 = newf;
5430 if (changed)
5431 dev_disable_change(idev);
5432 }
56d417b1 5433 }
c6d14c84 5434 rcu_read_unlock();
56d417b1
BH		 5435}
5436
013d97e9 5437static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf)
56d417b1
BH		 5438{
5439 struct net *net;
013d97e9
FR		 5440 int old;
5441
5442 if (!rtnl_trylock())
5443 return restart_syscall();
56d417b1
BH		 5444
5445 net = (struct net *)table->extra2;
013d97e9
FR		 5446 old = *p;
5447 *p = newf;
56d417b1 5448
013d97e9
FR		 5449 if (p == &net->ipv6.devconf_dflt->disable_ipv6) {
5450 rtnl_unlock();
56d417b1 5451 return 0;
88af182e 5452 }
56d417b1
BH		 5453
5454 if (p == &net->ipv6.devconf_all->disable_ipv6) {
56d417b1
BH		 5455 net->ipv6.devconf_dflt->disable_ipv6 = newf;
5456 addrconf_disable_change(net, newf);
013d97e9 5457 } else if ((!newf) ^ (!old))
56d417b1
BH		 5458 dev_disable_change((struct inet6_dev *)table->extra1);
5459
5460 rtnl_unlock();
5461 return 0;
5462}
5463
5464static
fe2c6338 5465int addrconf_sysctl_disable(struct ctl_table *ctl, int write,
56d417b1
BH		 5466 void __user *buffer, size_t *lenp, loff_t *ppos)
5467{
5468 int *valp = ctl->data;
5469 int val = *valp;
88af182e 5470 loff_t pos = *ppos;
fe2c6338 5471 struct ctl_table lctl;
56d417b1
BH		 5472 int ret;
5473
013d97e9
FR		 5474 /*
5475 * ctl->data points to idev->cnf.disable_ipv6, we should
5476 * not modify it until we get the rtnl lock.
5477 */
5478 lctl = *ctl;
5479 lctl.data = &val;
5480
5481 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
56d417b1
BH		 5482
5483 if (write)
5484 ret = addrconf_disable_ipv6(ctl, valp, val);
88af182e
EB		 5485 if (ret)
5486 *ppos = pos;
56d417b1
BH		 5487 return ret;
5488}
5489
c92d5491 5490static
5491int addrconf_sysctl_proxy_ndp(struct ctl_table *ctl, int write,
5492 void __user *buffer, size_t *lenp, loff_t *ppos)
5493{
5494 int *valp = ctl->data;
5495 int ret;
5496 int old, new;
5497
5498 old = *valp;
5499 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
5500 new = *valp;
5501
5502 if (write && old != new) {
5503 struct net *net = ctl->extra2;
5504
5505 if (!rtnl_trylock())
5506 return restart_syscall();
5507
5508 if (valp == &net->ipv6.devconf_dflt->proxy_ndp)
5509 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
5510 NETCONFA_IFINDEX_DEFAULT,
5511 net->ipv6.devconf_dflt);
5512 else if (valp == &net->ipv6.devconf_all->proxy_ndp)
5513 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
5514 NETCONFA_IFINDEX_ALL,
5515 net->ipv6.devconf_all);
5516 else {
5517 struct inet6_dev *idev = ctl->extra1;
5518
5519 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
5520 idev->dev->ifindex,
5521 &idev->cnf);
5522 }
5523 rtnl_unlock();
5524 }
5525
5526 return ret;
5527}
5528
3d1bec99
HFS		 5529static int addrconf_sysctl_stable_secret(struct ctl_table *ctl, int write,
5530 void __user *buffer, size_t *lenp,
5531 loff_t *ppos)
5532{
5533 int err;
5534 struct in6_addr addr;
5535 char str[IPV6_MAX_STRLEN];
5536 struct ctl_table lctl = *ctl;
622c81d5 5537 struct net *net = ctl->extra2;
3d1bec99
HFS		 5538 struct ipv6_stable_secret *secret = ctl->data;
5539
622c81d5
HFS		 5540 if (&net->ipv6.devconf_all->stable_secret == ctl->data)
5541 return -EIO;
5542
3d1bec99
HFS		 5543 lctl.maxlen = IPV6_MAX_STRLEN;
5544 lctl.data = str;
5545
5546 if (!rtnl_trylock())
5547 return restart_syscall();
5548
5549 if (!write && !secret->initialized) {
5550 err = -EIO;
5551 goto out;
5552 }
5553
5449a5ca
WC		 5554 err = snprintf(str, sizeof(str), "%pI6", &secret->secret);
5555 if (err >= sizeof(str)) {
5556 err = -EIO;
5557 goto out;
3d1bec99
HFS		 5558 }
5559
5560 err = proc_dostring(&lctl, write, buffer, lenp, ppos);
5561 if (err || !write)
5562 goto out;
5563
5564 if (in6_pton(str, -1, addr.in6_u.u6_addr8, -1, NULL) != 1) {
5565 err = -EIO;
5566 goto out;
5567 }
5568
5569 secret->initialized = true;
5570 secret->secret = addr;
5571
622c81d5
HFS		 5572 if (&net->ipv6.devconf_dflt->stable_secret == ctl->data) {
5573 struct net_device *dev;
5574
5575 for_each_netdev(net, dev) {
5576 struct inet6_dev *idev = __in6_dev_get(dev);
5577
5578 if (idev) {
5579 idev->addr_gen_mode =
5580 IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
5581 }
5582 }
5583 } else {
5584 struct inet6_dev *idev = ctl->extra1;
5585
5586 idev->addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
5587 }
5588
3d1bec99
HFS		 5589out:
5590 rtnl_unlock();
5591
5592 return err;
5593}
c92d5491 5594
35103d11
AG		 5595static
5596int addrconf_sysctl_ignore_routes_with_linkdown(struct ctl_table *ctl,
5597 int write,
5598 void __user *buffer,
5599 size_t *lenp,
5600 loff_t *ppos)
5601{
5602 int *valp = ctl->data;
5603 int val = *valp;
5604 loff_t pos = *ppos;
5605 struct ctl_table lctl;
5606 int ret;
5607
5608 /* ctl->data points to idev->cnf.ignore_routes_when_linkdown
5609 * we should not modify it until we get the rtnl lock.
5610 */
5611 lctl = *ctl;
5612 lctl.data = &val;
5613
5614 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
5615
5616 if (write)
5617 ret = addrconf_fixup_linkdown(ctl, valp, val);
5618 if (ret)
5619 *ppos = pos;
5620 return ret;
5621}
5622
607ea7cd 5623static const struct ctl_table addrconf_sysctl[] = {
5df1f77f
KK		 5624 {
5625 .procname = "forwarding",
5626 .data = &ipv6_devconf.forwarding,
5627 .maxlen = sizeof(int),
5628 .mode = 0644,
5629 .proc_handler = addrconf_sysctl_forward,
5630 },
5631 {
5632 .procname = "hop_limit",
5633 .data = &ipv6_devconf.hop_limit,
5634 .maxlen = sizeof(int),
5635 .mode = 0644,
5636 .proc_handler = addrconf_sysctl_hop_limit,
5637 },
5638 {
5639 .procname = "mtu",
5640 .data = &ipv6_devconf.mtu6,
5641 .maxlen = sizeof(int),
5642 .mode = 0644,
5643 .proc_handler = addrconf_sysctl_mtu,
5644 },
5645 {
5646 .procname = "accept_ra",
5647 .data = &ipv6_devconf.accept_ra,
5648 .maxlen = sizeof(int),
5649 .mode = 0644,
5650 .proc_handler = proc_dointvec,
5651 },
5652 {
5653 .procname = "accept_redirects",
5654 .data = &ipv6_devconf.accept_redirects,
5655 .maxlen = sizeof(int),
5656 .mode = 0644,
5657 .proc_handler = proc_dointvec,
5658 },
5659 {
5660 .procname = "autoconf",
5661 .data = &ipv6_devconf.autoconf,
5662 .maxlen = sizeof(int),
5663 .mode = 0644,
5664 .proc_handler = proc_dointvec,
5665 },
5666 {
5667 .procname = "dad_transmits",
5668 .data = &ipv6_devconf.dad_transmits,
5669 .maxlen = sizeof(int),
5670 .mode = 0644,
5671 .proc_handler = proc_dointvec,
5672 },
5673 {
5674 .procname = "router_solicitations",
5675 .data = &ipv6_devconf.rtr_solicits,
5676 .maxlen = sizeof(int),
5677 .mode = 0644,
5678 .proc_handler = proc_dointvec,
5679 },
5680 {
5681 .procname = "router_solicitation_interval",
5682 .data = &ipv6_devconf.rtr_solicit_interval,
5683 .maxlen = sizeof(int),
5684 .mode = 0644,
5685 .proc_handler = proc_dointvec_jiffies,
5686 },
5687 {
5688 .procname = "router_solicitation_delay",
5689 .data = &ipv6_devconf.rtr_solicit_delay,
5690 .maxlen = sizeof(int),
5691 .mode = 0644,
5692 .proc_handler = proc_dointvec_jiffies,
5693 },
5694 {
5695 .procname = "force_mld_version",
5696 .data = &ipv6_devconf.force_mld_version,
5697 .maxlen = sizeof(int),
5698 .mode = 0644,
5699 .proc_handler = proc_dointvec,
5700 },
5701 {
5702 .procname = "mldv1_unsolicited_report_interval",
5703 .data =
5704 &ipv6_devconf.mldv1_unsolicited_report_interval,
5705 .maxlen = sizeof(int),
5706 .mode = 0644,
5707 .proc_handler = proc_dointvec_ms_jiffies,
5708 },
5709 {
5710 .procname = "mldv2_unsolicited_report_interval",
5711 .data =
5712 &ipv6_devconf.mldv2_unsolicited_report_interval,
5713 .maxlen = sizeof(int),
5714 .mode = 0644,
5715 .proc_handler = proc_dointvec_ms_jiffies,
5716 },
5717 {
5718 .procname = "use_tempaddr",
5719 .data = &ipv6_devconf.use_tempaddr,
5720 .maxlen = sizeof(int),
5721 .mode = 0644,
5722 .proc_handler = proc_dointvec,
5723 },
5724 {
5725 .procname = "temp_valid_lft",
5726 .data = &ipv6_devconf.temp_valid_lft,
5727 .maxlen = sizeof(int),
5728 .mode = 0644,
5729 .proc_handler = proc_dointvec,
5730 },
5731 {
5732 .procname = "temp_prefered_lft",
5733 .data = &ipv6_devconf.temp_prefered_lft,
5734 .maxlen = sizeof(int),
5735 .mode = 0644,
5736 .proc_handler = proc_dointvec,
5737 },
5738 {
5739 .procname = "regen_max_retry",
5740 .data = &ipv6_devconf.regen_max_retry,
5741 .maxlen = sizeof(int),
5742 .mode = 0644,
5743 .proc_handler = proc_dointvec,
5744 },
5745 {
5746 .procname = "max_desync_factor",
5747 .data = &ipv6_devconf.max_desync_factor,
5748 .maxlen = sizeof(int),
5749 .mode = 0644,
5750 .proc_handler = proc_dointvec,
5751 },
5752 {
5753 .procname = "max_addresses",
5754 .data = &ipv6_devconf.max_addresses,
5755 .maxlen = sizeof(int),
5756 .mode = 0644,
5757 .proc_handler = proc_dointvec,
5758 },
5759 {
5760 .procname = "accept_ra_defrtr",
5761 .data = &ipv6_devconf.accept_ra_defrtr,
5762 .maxlen = sizeof(int),
5763 .mode = 0644,
5764 .proc_handler = proc_dointvec,
5765 },
5766 {
5767 .procname = "accept_ra_min_hop_limit",
5768 .data = &ipv6_devconf.accept_ra_min_hop_limit,
5769 .maxlen = sizeof(int),
5770 .mode = 0644,
5771 .proc_handler = proc_dointvec,
5772 },
5773 {
5774 .procname = "accept_ra_pinfo",
5775 .data = &ipv6_devconf.accept_ra_pinfo,
5776 .maxlen = sizeof(int),
5777 .mode = 0644,
5778 .proc_handler = proc_dointvec,
5779 },
930d6ff2 5780#ifdef CONFIG_IPV6_ROUTER_PREF
5df1f77f
KK		 5781 {
5782 .procname = "accept_ra_rtr_pref",
5783 .data = &ipv6_devconf.accept_ra_rtr_pref,
5784 .maxlen = sizeof(int),
5785 .mode = 0644,
5786 .proc_handler = proc_dointvec,
5787 },
5788 {
5789 .procname = "router_probe_interval",
5790 .data = &ipv6_devconf.rtr_probe_interval,
5791 .maxlen = sizeof(int),
5792 .mode = 0644,
5793 .proc_handler = proc_dointvec_jiffies,
5794 },
fa03ef38 5795#ifdef CONFIG_IPV6_ROUTE_INFO
5df1f77f
KK		 5796 {
5797 .procname = "accept_ra_rt_info_max_plen",
5798 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
5799 .maxlen = sizeof(int),
5800 .mode = 0644,
5801 .proc_handler = proc_dointvec,
5802 },
09c884d4 5803#endif
930d6ff2 5804#endif
5df1f77f
KK		 5805 {
5806 .procname = "proxy_ndp",
5807 .data = &ipv6_devconf.proxy_ndp,
5808 .maxlen = sizeof(int),
5809 .mode = 0644,
5810 .proc_handler = addrconf_sysctl_proxy_ndp,
5811 },
5812 {
5813 .procname = "accept_source_route",
5814 .data = &ipv6_devconf.accept_source_route,
5815 .maxlen = sizeof(int),
5816 .mode = 0644,
5817 .proc_handler = proc_dointvec,
5818 },
95c385b4 5819#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
5df1f77f
KK		 5820 {
5821 .procname = "optimistic_dad",
5822 .data = &ipv6_devconf.optimistic_dad,
5823 .maxlen = sizeof(int),
5824 .mode = 0644,
5825 .proc_handler = proc_dointvec,
5826 },
5827 {
5828 .procname = "use_optimistic",
5829 .data = &ipv6_devconf.use_optimistic,
5830 .maxlen = sizeof(int),
5831 .mode = 0644,
5832 .proc_handler = proc_dointvec,
5833 },
7bc570c8
YH		 5834#endif
5835#ifdef CONFIG_IPV6_MROUTE
5df1f77f
KK		 5836 {
5837 .procname = "mc_forwarding",
5838 .data = &ipv6_devconf.mc_forwarding,
5839 .maxlen = sizeof(int),
5840 .mode = 0444,
5841 .proc_handler = proc_dointvec,
5842 },
95c385b4 5843#endif
5df1f77f
KK		 5844 {
5845 .procname = "disable_ipv6",
5846 .data = &ipv6_devconf.disable_ipv6,
5847 .maxlen = sizeof(int),
5848 .mode = 0644,
5849 .proc_handler = addrconf_sysctl_disable,
5850 },
5851 {
5852 .procname = "accept_dad",
5853 .data = &ipv6_devconf.accept_dad,
5854 .maxlen = sizeof(int),
5855 .mode = 0644,
5856 .proc_handler = proc_dointvec,
5857 },
5858 {
5859 .procname = "force_tllao",
5860 .data = &ipv6_devconf.force_tllao,
5861 .maxlen = sizeof(int),
5862 .mode = 0644,
5863 .proc_handler = proc_dointvec
5864 },
5865 {
5866 .procname = "ndisc_notify",
5867 .data = &ipv6_devconf.ndisc_notify,
5868 .maxlen = sizeof(int),
5869 .mode = 0644,
5870 .proc_handler = proc_dointvec
5871 },
5872 {
5873 .procname = "suppress_frag_ndisc",
5874 .data = &ipv6_devconf.suppress_frag_ndisc,
5875 .maxlen = sizeof(int),
5876 .mode = 0644,
5877 .proc_handler = proc_dointvec
5878 },
5879 {
5880 .procname = "accept_ra_from_local",
5881 .data = &ipv6_devconf.accept_ra_from_local,
5882 .maxlen = sizeof(int),
5883 .mode = 0644,
5884 .proc_handler = proc_dointvec,
5885 },
5886 {
5887 .procname = "accept_ra_mtu",
5888 .data = &ipv6_devconf.accept_ra_mtu,
5889 .maxlen = sizeof(int),
5890 .mode = 0644,
5891 .proc_handler = proc_dointvec,
5892 },
5893 {
5894 .procname = "stable_secret",
5895 .data = &ipv6_devconf.stable_secret,
5896 .maxlen = IPV6_MAX_STRLEN,
5897 .mode = 0600,
5898 .proc_handler = addrconf_sysctl_stable_secret,
5899 },
5900 {
5901 .procname = "use_oif_addrs_only",
5902 .data = &ipv6_devconf.use_oif_addrs_only,
5903 .maxlen = sizeof(int),
5904 .mode = 0644,
5905 .proc_handler = proc_dointvec,
5906 },
5907 {
5908 .procname = "ignore_routes_with_linkdown",
5909 .data = &ipv6_devconf.ignore_routes_with_linkdown,
5910 .maxlen = sizeof(int),
5911 .mode = 0644,
5912 .proc_handler = addrconf_sysctl_ignore_routes_with_linkdown,
5913 },
5914 {
5915 .procname = "drop_unicast_in_l2_multicast",
5916 .data = &ipv6_devconf.drop_unicast_in_l2_multicast,
5917 .maxlen = sizeof(int),
5918 .mode = 0644,
5919 .proc_handler = proc_dointvec,
5920 },
5921 {
5922 .procname = "drop_unsolicited_na",
5923 .data = &ipv6_devconf.drop_unsolicited_na,
5924 .maxlen = sizeof(int),
5925 .mode = 0644,
5926 .proc_handler = proc_dointvec,
5927 },
5928 {
5929 .procname = "keep_addr_on_down",
5930 .data = &ipv6_devconf.keep_addr_on_down,
5931 .maxlen = sizeof(int),
5932 .mode = 0644,
5933 .proc_handler = proc_dointvec,
5934
5935 },
5936 {
5937 /* sentinel */
5938 }
1da177e4
LT		 5939};
5940
bff16c2f 5941static int __addrconf_sysctl_register(struct net *net, char *dev_name,
f8572d8f 5942 struct inet6_dev *idev, struct ipv6_devconf *p)
1da177e4
LT		 5943{
5944 int i;
607ea7cd 5945 struct ctl_table *table;
6105e293 5946 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ];
1dab6222 5947
607ea7cd
KK		 5948 table = kmemdup(addrconf_sysctl, sizeof(addrconf_sysctl), GFP_KERNEL);
5949 if (!table)
f68635e6
PE		 5950 goto out;
5951
607ea7cd
KK		 5952 for (i = 0; table[i].data; i++) {
5953 table[i].data += (char *)p - (char *)&ipv6_devconf;
5954 table[i].extra1 = idev; /* embedded; no ref */
5955 table[i].extra2 = net;
1da177e4 5956 }
1da177e4 5957
6105e293 5958 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name);
1da177e4 5959
607ea7cd
KK		 5960 p->sysctl_header = register_net_sysctl(net, path, table);
5961 if (!p->sysctl_header)
6105e293 5962 goto free;
f68635e6 5963
95897312 5964 return 0;
1da177e4 5965
f68635e6 5966free:
607ea7cd 5967 kfree(table);
f68635e6 5968out:
95897312 5969 return -ENOBUFS;
1da177e4
LT		 5970}
5971
408c4768
PE		 5972static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
5973{
607ea7cd 5974 struct ctl_table *table;
408c4768 5975
607ea7cd 5976 if (!p->sysctl_header)
408c4768
PE		 5977 return;
5978
607ea7cd
KK		 5979 table = p->sysctl_header->ctl_table_arg;
5980 unregister_net_sysctl_table(p->sysctl_header);
5981 p->sysctl_header = NULL;
5982 kfree(table);
408c4768
PE		 5983}
5984
a317a2f1 5985static int addrconf_sysctl_register(struct inet6_dev *idev)
f52295a9 5986{
a317a2f1
WC		 5987 int err;
5988
5989 if (!sysctl_dev_name_is_allowed(idev->dev->name))
5990 return -EINVAL;
5991
5992 err = neigh_sysctl_register(idev->dev, idev->nd_parms,
5993 &ndisc_ifinfo_sysctl_change);
5994 if (err)
5995 return err;
5996 err = __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
5997 idev, &idev->cnf);
5998 if (err)
5999 neigh_sysctl_unregister(idev->nd_parms);
6000
6001 return err;
f52295a9
PE		 6002}
6003
408c4768 6004static void addrconf_sysctl_unregister(struct inet6_dev *idev)
1da177e4 6005{
408c4768
PE		 6006 __addrconf_sysctl_unregister(&idev->cnf);
6007 neigh_sysctl_unregister(idev->nd_parms);
1da177e4
LT		 6008}
6009
6010
6011#endif
6012
2c8c1e72 6013static int __net_init addrconf_init_net(struct net *net)
e0da5a48 6014{
a79ca223 6015 int err = -ENOMEM;
e0da5a48
PE		 6016 struct ipv6_devconf *all, *dflt;
6017
a79ca223 6018 all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL);
63159f29 6019 if (!all)
a79ca223 6020 goto err_alloc_all;
e0da5a48 6021
a79ca223 6022 dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
63159f29 6023 if (!dflt)
a79ca223 6024 goto err_alloc_dflt;
e0da5a48 6025
a79ca223
HZ		 6026 /* these will be inherited by all namespaces */
6027 dflt->autoconf = ipv6_defaults.autoconf;
6028 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
e0da5a48 6029
3d1bec99
HFS		 6030 dflt->stable_secret.initialized = false;
6031 all->stable_secret.initialized = false;
6032
e0da5a48
PE		 6033 net->ipv6.devconf_all = all;
6034 net->ipv6.devconf_dflt = dflt;
6035
6036#ifdef CONFIG_SYSCTL
f8572d8f 6037 err = __addrconf_sysctl_register(net, "all", NULL, all);
e0da5a48
PE		 6038 if (err < 0)
6039 goto err_reg_all;
6040
f8572d8f 6041 err = __addrconf_sysctl_register(net, "default", NULL, dflt);
e0da5a48
PE		 6042 if (err < 0)
6043 goto err_reg_dflt;
6044#endif
6045 return 0;
6046
6047#ifdef CONFIG_SYSCTL
6048err_reg_dflt:
6049 __addrconf_sysctl_unregister(all);
6050err_reg_all:
6051 kfree(dflt);
6052#endif
6053err_alloc_dflt:
6054 kfree(all);
6055err_alloc_all:
6056 return err;
6057}
6058
2c8c1e72 6059static void __net_exit addrconf_exit_net(struct net *net)
e0da5a48
PE		 6060{
6061#ifdef CONFIG_SYSCTL
6062 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
6063 __addrconf_sysctl_unregister(net->ipv6.devconf_all);
6064#endif
73cf0e92 6065 kfree(net->ipv6.devconf_dflt);
6066 kfree(net->ipv6.devconf_all);
e0da5a48
PE		 6067}
6068
6069static struct pernet_operations addrconf_ops = {
6070 .init = addrconf_init_net,
6071 .exit = addrconf_exit_net,
6072};
6073
207895fd 6074static struct rtnl_af_ops inet6_ops __read_mostly = {
b382b191
TG		 6075 .family = AF_INET6,
6076 .fill_link_af = inet6_fill_link_af,
6077 .get_link_af_size = inet6_get_link_af_size,
11b1f828 6078 .validate_link_af = inet6_validate_link_af,
f53adae4 6079 .set_link_af = inet6_set_link_af,
b382b191
TG		 6080};
6081
1da177e4
LT		 6082/*
6083 * Init / cleanup code
6084 */
6085
6086int __init addrconf_init(void)
6087{
a317a2f1 6088 struct inet6_dev *idev;
c2e21293 6089 int i, err;
2a8cc6c8 6090
e21e8467
SH		 6091 err = ipv6_addr_label_init();
6092 if (err < 0) {
f3213831
JP		 6093 pr_crit("%s: cannot initialize default policy table: %d\n",
6094 __func__, err);
2cc6d2bf 6095 goto out;
2a8cc6c8 6096 }
1da177e4 6097
2cc6d2bf
NH		 6098 err = register_pernet_subsys(&addrconf_ops);
6099 if (err < 0)
6100 goto out_addrlabel;
e0da5a48 6101
c15b1cca
HFS		 6102 addrconf_wq = create_workqueue("ipv6_addrconf");
6103 if (!addrconf_wq) {
6104 err = -ENOMEM;
6105 goto out_nowq;
6106 }
6107
1da177e4
LT		 6108 /* The addrconf netdev notifier requires that loopback_dev
6109 * has it's ipv6 private information allocated and setup
6110 * before it can bring up and give link-local addresses
6111 * to other devices which are up.
6112 *
6113 * Unfortunately, loopback_dev is not necessarily the first
6114 * entry in the global dev_base list of net devices. In fact,
6115 * it is likely to be the very last entry on that list.
6116 * So this causes the notifier registry below to try and
6117 * give link-local addresses to all devices besides loopback_dev
6118 * first, then loopback_dev, which cases all the non-loopback_dev
6119 * devices to fail to get a link-local address.
6120 *
6121 * So, as a temporary fix, allocate the ipv6 structure for
6122 * loopback_dev first by hand.
6123 * Longer term, all of the dependencies ipv6 has upon the loopback
6124 * device and it being up should be removed.
6125 */
6126 rtnl_lock();
a317a2f1 6127 idev = ipv6_add_dev(init_net.loopback_dev);
1da177e4 6128 rtnl_unlock();
a317a2f1
WC		 6129 if (IS_ERR(idev)) {
6130 err = PTR_ERR(idev);
e0da5a48 6131 goto errlo;
a317a2f1 6132 }
1da177e4 6133
c2e21293 6134 for (i = 0; i < IN6_ADDR_HSIZE; i++)
6135 INIT_HLIST_HEAD(&inet6_addr_lst[i]);
6136
1da177e4
LT		 6137 register_netdevice_notifier(&ipv6_dev_notf);
6138
c15b1cca 6139 addrconf_verify();
c127ea2c 6140
3678a9d8 6141 rtnl_af_register(&inet6_ops);
b382b191 6142
c7ac8679
GR		 6143 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo,
6144 NULL);
c127ea2c
TG		 6145 if (err < 0)
6146 goto errout;
6147
6148 /* Only the first call to __rtnl_register can fail */
c7ac8679
GR		 6149 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL, NULL);
6150 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL, NULL);
6151 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr,
6152 inet6_dump_ifaddr, NULL);
6153 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL,
6154 inet6_dump_ifmcaddr, NULL);
6155 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL,
6156 inet6_dump_ifacaddr, NULL);
76f8f6cb 6157 __rtnl_register(PF_INET6, RTM_GETNETCONF, inet6_netconf_get_devconf,
7a674200 6158 inet6_netconf_dump_devconf, NULL);
c127ea2c 6159
2a8cc6c8
YH		 6160 ipv6_addr_label_rtnl_register();
6161
1da177e4 6162 return 0;
c127ea2c 6163errout:
b382b191 6164 rtnl_af_unregister(&inet6_ops);
c127ea2c 6165 unregister_netdevice_notifier(&ipv6_dev_notf);
e0da5a48 6166errlo:
c15b1cca
HFS		 6167 destroy_workqueue(addrconf_wq);
6168out_nowq:
e0da5a48 6169 unregister_pernet_subsys(&addrconf_ops);
2cc6d2bf
NH		 6170out_addrlabel:
6171 ipv6_addr_label_cleanup();
6172out:
c127ea2c 6173 return err;
1da177e4
LT		 6174}
6175
09f7709f 6176void addrconf_cleanup(void)
1da177e4 6177{
176c39af 6178 struct net_device *dev;
1da177e4
LT		 6179 int i;
6180
6181 unregister_netdevice_notifier(&ipv6_dev_notf);
e0da5a48 6182 unregister_pernet_subsys(&addrconf_ops);
2cc6d2bf 6183 ipv6_addr_label_cleanup();
1da177e4
LT		 6184
6185 rtnl_lock();
6186
b382b191
TG		 6187 __rtnl_af_unregister(&inet6_ops);
6188
176c39af
DL		 6189 /* clean dev list */
6190 for_each_netdev(&init_net, dev) {
6191 if (__in6_dev_get(dev) == NULL)
6192 continue;
6193 addrconf_ifdown(dev, 1);
6194 }
6195 addrconf_ifdown(init_net.loopback_dev, 2);
6196
1da177e4
LT		 6197 /*
6198 * Check hash table.
6199 */
5c578aed 6200 spin_lock_bh(&addrconf_hash_lock);
c2e21293 6201 for (i = 0; i < IN6_ADDR_HSIZE; i++)
6202 WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
5c578aed 6203 spin_unlock_bh(&addrconf_hash_lock);
c15b1cca 6204 cancel_delayed_work(&addr_chk_work);
1da177e4 6205 rtnl_unlock();
c15b1cca
HFS		 6206
6207 destroy_workqueue(addrconf_wq);
1da177e4 6208}
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