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addrconf: put prefix address add in an own function
[deliverable/linux.git] / net / ipv6 / addrconf.c
CommitLineData
1da177e4
LT		 1/*
2 * IPv6 Address [auto]configuration
3 * Linux INET6 implementation
4 *
5 * Authors:
1ab1457c 6 * Pedro Roque <roque@di.fc.ul.pt>
1da177e4
LT		 7 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
8 *
1da177e4
LT		 9 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License
11 * as published by the Free Software Foundation; either version
12 * 2 of the License, or (at your option) any later version.
13 */
14
15/*
16 * Changes:
17 *
18 * Janos Farkas : delete timer on ifdown
19 * <chexum@bankinf.banki.hu>
20 * Andi Kleen : kill double kfree on module
21 * unload.
22 * Maciej W. Rozycki : FDDI support
23 * sekiya@USAGI : Don't send too many RS
24 * packets.
25 * yoshfuji@USAGI : Fixed interval between DAD
26 * packets.
27 * YOSHIFUJI Hideaki @USAGI : improved accuracy of
28 * address validation timer.
29 * YOSHIFUJI Hideaki @USAGI : Privacy Extensions (RFC3041)
30 * support.
31 * Yuji SEKIYA @USAGI : Don't assign a same IPv6
32 * address on a same interface.
33 * YOSHIFUJI Hideaki @USAGI : ARCnet support
34 * YOSHIFUJI Hideaki @USAGI : convert /proc/net/if_inet6 to
35 * seq_file.
b1cacb68
YH		 36 * YOSHIFUJI Hideaki @USAGI : improved source address
37 * selection; consider scope,
38 * status etc.
1da177e4
LT		 39 */
40
f3213831
JP		 41#define pr_fmt(fmt) "IPv6: " fmt
42
1da177e4
LT		 43#include <linux/errno.h>
44#include <linux/types.h>
a0bffffc 45#include <linux/kernel.h>
1da177e4
LT		 46#include <linux/socket.h>
47#include <linux/sockios.h>
1da177e4 48#include <linux/net.h>
3d1bec99 49#include <linux/inet.h>
1da177e4
LT		 50#include <linux/in6.h>
51#include <linux/netdevice.h>
1823730f 52#include <linux/if_addr.h>
1da177e4
LT		 53#include <linux/if_arp.h>
54#include <linux/if_arcnet.h>
55#include <linux/if_infiniband.h>
56#include <linux/route.h>
57#include <linux/inetdevice.h>
58#include <linux/init.h>
5a0e3ad6 59#include <linux/slab.h>
1da177e4
LT		 60#ifdef CONFIG_SYSCTL
61#include <linux/sysctl.h>
62#endif
4fc268d2 63#include <linux/capability.h>
1da177e4
LT		 64#include <linux/delay.h>
65#include <linux/notifier.h>
543537bd 66#include <linux/string.h>
ddbe5032 67#include <linux/hash.h>
1da177e4 68
457c4cbc 69#include <net/net_namespace.h>
1da177e4
LT		 70#include <net/sock.h>
71#include <net/snmp.h>
72
5241c2d7 73#include <net/6lowpan.h>
cb6bf355 74#include <net/firewire.h>
1da177e4
LT		 75#include <net/ipv6.h>
76#include <net/protocol.h>
77#include <net/ndisc.h>
78#include <net/ip6_route.h>
79#include <net/addrconf.h>
80#include <net/tcp.h>
81#include <net/ip.h>
5d620266 82#include <net/netlink.h>
f24e3d65 83#include <net/pkt_sched.h>
ca254490 84#include <net/l3mdev.h>
1da177e4
LT		 85#include <linux/if_tunnel.h>
86#include <linux/rtnetlink.h>
f3a1bfb1 87#include <linux/netconf.h>
1da177e4 88#include <linux/random.h>
e21e8467 89#include <linux/uaccess.h>
7f7d9a6b 90#include <asm/unaligned.h>
1da177e4
LT		 91
92#include <linux/proc_fs.h>
93#include <linux/seq_file.h>
bc3b2d7f 94#include <linux/export.h>
1da177e4
LT		 95
96/* Set to 3 to get tracing... */
97#define ACONF_DEBUG 2
98
99#if ACONF_DEBUG >= 3
ba3542e1 100#define ADBG(fmt, ...) printk(fmt, ##__VA_ARGS__)
1da177e4 101#else
ba3542e1 102#define ADBG(fmt, ...) do { if (0) printk(fmt, ##__VA_ARGS__); } while (0)
1da177e4
LT		 103#endif
104
105#define INFINITY_LIFE_TIME 0xFFFFFFFF
18a31e1e 106
3d1bec99
HFS		 107#define IPV6_MAX_STRLEN \
108 sizeof("ffff:ffff:ffff:ffff:ffff:ffff:255.255.255.255")
109
18a31e1e
TG		 110static inline u32 cstamp_delta(unsigned long cstamp)
111{
112 return (cstamp - INITIAL_JIFFIES) * 100UL / HZ;
113}
1da177e4
LT		 114
115#ifdef CONFIG_SYSCTL
a317a2f1 116static int addrconf_sysctl_register(struct inet6_dev *idev);
408c4768
PE		 117static void addrconf_sysctl_unregister(struct inet6_dev *idev);
118#else
a317a2f1 119static inline int addrconf_sysctl_register(struct inet6_dev *idev)
408c4768 120{
a317a2f1 121 return 0;
408c4768
PE		 122}
123
124static inline void addrconf_sysctl_unregister(struct inet6_dev *idev)
125{
126}
1da177e4
LT		 127#endif
128
eb7e0575
SD		 129static void __ipv6_regen_rndid(struct inet6_dev *idev);
130static void __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
1da177e4 131static void ipv6_regen_rndid(unsigned long data);
1da177e4 132
1b34be74 133static int ipv6_generate_eui64(u8 *eui, struct net_device *dev);
1da177e4 134static int ipv6_count_addresses(struct inet6_dev *idev);
622c81d5
HFS		 135static int ipv6_generate_stable_address(struct in6_addr *addr,
136 u8 dad_count,
137 const struct inet6_dev *idev);
1da177e4
LT		 138
139/*
140 * Configured unicast address hash table
141 */
c2e21293 142static struct hlist_head inet6_addr_lst[IN6_ADDR_HSIZE];
5c578aed 143static DEFINE_SPINLOCK(addrconf_hash_lock);
1da177e4 144
c15b1cca
HFS		 145static void addrconf_verify(void);
146static void addrconf_verify_rtnl(void);
147static void addrconf_verify_work(struct work_struct *);
1da177e4 148
c15b1cca
HFS		 149static struct workqueue_struct *addrconf_wq;
150static DECLARE_DELAYED_WORK(addr_chk_work, addrconf_verify_work);
1da177e4
LT		 151
152static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
153static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
154
93d9b7d7
JP		 155static void addrconf_type_change(struct net_device *dev,
156 unsigned long event);
1da177e4
LT		 157static int addrconf_ifdown(struct net_device *dev, int how);
158
21caa662
RK		 159static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
160 int plen,
161 const struct net_device *dev,
162 u32 flags, u32 noflags);
163
cf22f9a2 164static void addrconf_dad_start(struct inet6_ifaddr *ifp);
c15b1cca 165static void addrconf_dad_work(struct work_struct *w);
1da177e4 166static void addrconf_dad_completed(struct inet6_ifaddr *ifp);
c5e33bdd 167static void addrconf_dad_run(struct inet6_dev *idev);
1da177e4
LT		 168static void addrconf_rs_timer(unsigned long data);
169static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
170static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
171
1ab1457c 172static void inet6_prefix_notify(int event, struct inet6_dev *idev,
1da177e4 173 struct prefix_info *pinfo);
3e81c6da
DM		 174static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
175 struct net_device *dev);
1da177e4 176
888c848e 177static struct ipv6_devconf ipv6_devconf __read_mostly = {
1da177e4
LT		 178 .forwarding = 0,
179 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
180 .mtu6 = IPV6_MIN_MTU,
181 .accept_ra = 1,
182 .accept_redirects = 1,
183 .autoconf = 1,
184 .force_mld_version = 0,
fc4eba58
HFS		 185 .mldv1_unsolicited_report_interval = 10 * HZ,
186 .mldv2_unsolicited_report_interval = HZ,
1da177e4
LT		 187 .dad_transmits = 1,
188 .rtr_solicits = MAX_RTR_SOLICITATIONS,
189 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
190 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
67ba4152 191 .use_tempaddr = 0,
1da177e4
LT		 192 .temp_valid_lft = TEMP_VALID_LIFETIME,
193 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
194 .regen_max_retry = REGEN_MAX_RETRY,
195 .max_desync_factor = MAX_DESYNC_FACTOR,
1da177e4 196 .max_addresses = IPV6_MAX_ADDRESSES,
65f5c7c1 197 .accept_ra_defrtr = 1,
d9333196 198 .accept_ra_from_local = 0,
8013d1d7 199 .accept_ra_min_hop_limit= 1,
c4fd30eb 200 .accept_ra_pinfo = 1,
930d6ff2
YH		 201#ifdef CONFIG_IPV6_ROUTER_PREF
202 .accept_ra_rtr_pref = 1,
52e16356 203 .rtr_probe_interval = 60 * HZ,
09c884d4
YH		 204#ifdef CONFIG_IPV6_ROUTE_INFO
205 .accept_ra_rt_info_max_plen = 0,
206#endif
930d6ff2 207#endif
fbea49e1 208 .proxy_ndp = 0,
0bcbc926 209 .accept_source_route = 0, /* we do not accept RH0 by default. */
778d80be 210 .disable_ipv6 = 0,
1b34be74 211 .accept_dad = 1,
b800c3b9 212 .suppress_frag_ndisc = 1,
c2943f14 213 .accept_ra_mtu = 1,
3d1bec99
HFS		 214 .stable_secret = {
215 .initialized = false,
3985e8a3
EK		 216 },
217 .use_oif_addrs_only = 0,
35103d11 218 .ignore_routes_with_linkdown = 0,
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
4f672235
AA		 2336static int addrconf_prefix_rcv_add_addr(struct net *net,
2337 struct net_device *dev,
2338 const struct prefix_info *pinfo,
2339 struct inet6_dev *in6_dev,
2340 const struct in6_addr *addr,
2341 int addr_type, u32 addr_flags,
2342 bool sllao, bool tokenized,
2343 __u32 valid_lft, u32 prefered_lft)
2344{
2345 struct inet6_ifaddr *ifp = ipv6_get_ifaddr(net, addr, dev, 1);
2346 int create = 0, update_lft = 0;
2347
2348 if (!ifp && valid_lft) {
2349 int max_addresses = in6_dev->cnf.max_addresses;
2350
2351#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2352 if (in6_dev->cnf.optimistic_dad &&
2353 !net->ipv6.devconf_all->forwarding && sllao)
2354 addr_flags |= IFA_F_OPTIMISTIC;
2355#endif
2356
2357 /* Do not allow to create too much of autoconfigured
2358 * addresses; this would be too easy way to crash kernel.
2359 */
2360 if (!max_addresses ||
2361 ipv6_count_addresses(in6_dev) < max_addresses)
2362 ifp = ipv6_add_addr(in6_dev, addr, NULL,
2363 pinfo->prefix_len,
2364 addr_type&IPV6_ADDR_SCOPE_MASK,
2365 addr_flags, valid_lft,
2366 prefered_lft);
2367
2368 if (IS_ERR_OR_NULL(ifp))
2369 return -1;
2370
2371 update_lft = 0;
2372 create = 1;
2373 spin_lock_bh(&ifp->lock);
2374 ifp->flags |= IFA_F_MANAGETEMPADDR;
2375 ifp->cstamp = jiffies;
2376 ifp->tokenized = tokenized;
2377 spin_unlock_bh(&ifp->lock);
2378 addrconf_dad_start(ifp);
2379 }
2380
2381 if (ifp) {
2382 u32 flags;
2383 unsigned long now;
2384 u32 stored_lft;
2385
2386 /* update lifetime (RFC2462 5.5.3 e) */
2387 spin_lock_bh(&ifp->lock);
2388 now = jiffies;
2389 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
2390 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
2391 else
2392 stored_lft = 0;
2393 if (!update_lft && !create && stored_lft) {
2394 const u32 minimum_lft = min_t(u32,
2395 stored_lft, MIN_VALID_LIFETIME);
2396 valid_lft = max(valid_lft, minimum_lft);
2397
2398 /* RFC4862 Section 5.5.3e:
2399 * "Note that the preferred lifetime of the
2400 * corresponding address is always reset to
2401 * the Preferred Lifetime in the received
2402 * Prefix Information option, regardless of
2403 * whether the valid lifetime is also reset or
2404 * ignored."
2405 *
2406 * So we should always update prefered_lft here.
2407 */
2408 update_lft = 1;
2409 }
2410
2411 if (update_lft) {
2412 ifp->valid_lft = valid_lft;
2413 ifp->prefered_lft = prefered_lft;
2414 ifp->tstamp = now;
2415 flags = ifp->flags;
2416 ifp->flags &= ~IFA_F_DEPRECATED;
2417 spin_unlock_bh(&ifp->lock);
2418
2419 if (!(flags&IFA_F_TENTATIVE))
2420 ipv6_ifa_notify(0, ifp);
2421 } else
2422 spin_unlock_bh(&ifp->lock);
2423
2424 manage_tempaddrs(in6_dev, ifp, valid_lft, prefered_lft,
2425 create, now);
2426
2427 in6_ifa_put(ifp);
2428 addrconf_verify();
2429 }
2430
2431 return 0;
2432}
2433
e6bff995 2434void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao)
1da177e4
LT		 2435{
2436 struct prefix_info *pinfo;
2437 __u32 valid_lft;
2438 __u32 prefered_lft;
4f672235 2439 int addr_type, err;
64236f3f 2440 u32 addr_flags = 0;
1da177e4 2441 struct inet6_dev *in6_dev;
56d417b1 2442 struct net *net = dev_net(dev);
1da177e4
LT		 2443
2444 pinfo = (struct prefix_info *) opt;
1ab1457c 2445
1da177e4 2446 if (len < sizeof(struct prefix_info)) {
ba3542e1 2447 ADBG("addrconf: prefix option too short\n");
1da177e4
LT		 2448 return;
2449 }
1ab1457c 2450
1da177e4
LT		 2451 /*
2452 * Validation checks ([ADDRCONF], page 19)
2453 */
2454
2455 addr_type = ipv6_addr_type(&pinfo->prefix);
2456
2457 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
2458 return;
2459
2460 valid_lft = ntohl(pinfo->valid);
2461 prefered_lft = ntohl(pinfo->prefered);
2462
2463 if (prefered_lft > valid_lft) {
e87cc472 2464 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n");
1da177e4
LT		 2465 return;
2466 }
2467
2468 in6_dev = in6_dev_get(dev);
2469
63159f29 2470 if (!in6_dev) {
e87cc472
JP		 2471 net_dbg_ratelimited("addrconf: device %s not configured\n",
2472 dev->name);
1da177e4
LT		 2473 return;
2474 }
2475
2476 /*
2477 * Two things going on here:
2478 * 1) Add routes for on-link prefixes
2479 * 2) Configure prefixes with the auto flag set
2480 */
2481
4bed72e4
YH		 2482 if (pinfo->onlink) {
2483 struct rt6_info *rt;
2484 unsigned long rt_expires;
2485
6f704992
YH		 2486 /* Avoid arithmetic overflow. Really, we could
2487 * save rt_expires in seconds, likely valid_lft,
2488 * but it would require division in fib gc, that it
2489 * not good.
2490 */
4bed72e4
YH		 2491 if (HZ > USER_HZ)
2492 rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
2493 else
2494 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
3dd4bc68 2495
4bed72e4
YH		 2496 if (addrconf_finite_timeout(rt_expires))
2497 rt_expires *= HZ;
1da177e4 2498
14ef37b6
AH		 2499 rt = addrconf_get_prefix_route(&pinfo->prefix,
2500 pinfo->prefix_len,
2501 dev,
2502 RTF_ADDRCONF | RTF_PREFIX_RT,
2503 RTF_GATEWAY | RTF_DEFAULT);
1da177e4 2504
14ef37b6 2505 if (rt) {
6f704992
YH		 2506 /* Autoconf prefix route */
2507 if (valid_lft == 0) {
2508 ip6_del_rt(rt);
2509 rt = NULL;
4bed72e4 2510 } else if (addrconf_finite_timeout(rt_expires)) {
6f704992 2511 /* not infinity */
1716a961 2512 rt6_set_expires(rt, jiffies + rt_expires);
6f704992 2513 } else {
1716a961 2514 rt6_clean_expires(rt);
1da177e4
LT		 2515 }
2516 } else if (valid_lft) {
6f704992 2517 clock_t expires = 0;
4bed72e4
YH		 2518 int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
2519 if (addrconf_finite_timeout(rt_expires)) {
6f704992
YH		 2520 /* not infinity */
2521 flags |= RTF_EXPIRES;
2522 expires = jiffies_to_clock_t(rt_expires);
2523 }
1da177e4 2524 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
6f704992 2525 dev, expires, flags);
1da177e4 2526 }
94e187c0 2527 ip6_rt_put(rt);
1da177e4
LT		 2528 }
2529
2530 /* Try to figure out our local address for this prefix */
2531
2532 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
1da177e4 2533 struct in6_addr addr;
617fe29d 2534 bool tokenized = false;
1da177e4
LT		 2535
2536 if (pinfo->prefix_len == 64) {
2537 memcpy(&addr, &pinfo->prefix, 8);
f53adae4
DB		 2538
2539 if (!ipv6_addr_any(&in6_dev->token)) {
2540 read_lock_bh(&in6_dev->lock);
2541 memcpy(addr.s6_addr + 8,
2542 in6_dev->token.s6_addr + 8, 8);
2543 read_unlock_bh(&in6_dev->lock);
617fe29d 2544 tokenized = true;
cc9da6cc 2545 } else if (is_addr_mode_generate_stable(in6_dev) &&
622c81d5
HFS		 2546 !ipv6_generate_stable_address(&addr, 0,
2547 in6_dev)) {
64236f3f 2548 addr_flags |= IFA_F_STABLE_PRIVACY;
622c81d5 2549 goto ok;
f53adae4
DB		 2550 } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
2551 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
4f672235 2552 goto put;
1da177e4
LT		 2553 }
2554 goto ok;
2555 }
e87cc472
JP		 2556 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n",
2557 pinfo->prefix_len);
4f672235 2558 goto put;
1da177e4
LT		 2559
2560ok:
4f672235
AA		 2561 err = addrconf_prefix_rcv_add_addr(net, dev, pinfo, in6_dev,
2562 &addr, addr_type,
2563 addr_flags, sllao,
2564 tokenized, valid_lft,
2565 prefered_lft);
2566 if (err)
2567 goto put;
1da177e4
LT		 2568 }
2569 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
4f672235 2570put:
1da177e4
LT		 2571 in6_dev_put(in6_dev);
2572}
2573
2574/*
2575 * Set destination address.
2576 * Special case for SIT interfaces where we create a new "virtual"
2577 * device.
2578 */
af284937 2579int addrconf_set_dstaddr(struct net *net, void __user *arg)
1da177e4
LT		 2580{
2581 struct in6_ifreq ireq;
2582 struct net_device *dev;
2583 int err = -EINVAL;
2584
2585 rtnl_lock();
2586
2587 err = -EFAULT;
2588 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2589 goto err_exit;
2590
af284937 2591 dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
1da177e4
LT		 2592
2593 err = -ENODEV;
63159f29 2594 if (!dev)
1da177e4
LT		 2595 goto err_exit;
2596
07a93626 2597#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4 2598 if (dev->type == ARPHRD_SIT) {
5bc3eb7e 2599 const struct net_device_ops *ops = dev->netdev_ops;
1da177e4 2600 struct ifreq ifr;
1da177e4
LT		 2601 struct ip_tunnel_parm p;
2602
2603 err = -EADDRNOTAVAIL;
2604 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2605 goto err_exit;
2606
2607 memset(&p, 0, sizeof(p));
2608 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2609 p.iph.saddr = 0;
2610 p.iph.version = 4;
2611 p.iph.ihl = 5;
2612 p.iph.protocol = IPPROTO_IPV6;
2613 p.iph.ttl = 64;
d20b3109 2614 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
1da177e4 2615
5bc3eb7e
SH		 2616 if (ops->ndo_do_ioctl) {
2617 mm_segment_t oldfs = get_fs();
2618
2619 set_fs(KERNEL_DS);
2620 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2621 set_fs(oldfs);
2622 } else
2623 err = -EOPNOTSUPP;
1da177e4
LT		 2624
2625 if (err == 0) {
2626 err = -ENOBUFS;
af284937
DL		 2627 dev = __dev_get_by_name(net, p.name);
2628 if (!dev)
1da177e4
LT		 2629 goto err_exit;
2630 err = dev_open(dev);
2631 }
2632 }
0be669bb 2633#endif
1da177e4
LT		 2634
2635err_exit:
2636 rtnl_unlock();
2637 return err;
2638}
2639
93a714d6
MC		 2640static int ipv6_mc_config(struct sock *sk, bool join,
2641 const struct in6_addr *addr, int ifindex)
2642{
2643 int ret;
2644
2645 ASSERT_RTNL();
2646
2647 lock_sock(sk);
2648 if (join)
54ff9ef3 2649 ret = ipv6_sock_mc_join(sk, ifindex, addr);
93a714d6 2650 else
54ff9ef3 2651 ret = ipv6_sock_mc_drop(sk, ifindex, addr);
93a714d6
MC		 2652 release_sock(sk);
2653
2654 return ret;
2655}
2656
1da177e4
LT		 2657/*
2658 * Manual configuration of address on an interface
2659 */
479840ff
JP		 2660static int inet6_addr_add(struct net *net, int ifindex,
2661 const struct in6_addr *pfx,
caeaba79 2662 const struct in6_addr *peer_pfx,
479840ff
JP		 2663 unsigned int plen, __u32 ifa_flags,
2664 __u32 prefered_lft, __u32 valid_lft)
1da177e4
LT		 2665{
2666 struct inet6_ifaddr *ifp;
2667 struct inet6_dev *idev;
2668 struct net_device *dev;
93a714d6
MC		 2669 unsigned long timeout;
2670 clock_t expires;
1da177e4 2671 int scope;
6f704992 2672 u32 flags;
1da177e4
LT		 2673
2674 ASSERT_RTNL();
1ab1457c 2675
24ef0da7
TG		 2676 if (plen > 128)
2677 return -EINVAL;
2678
0778769d
NT		 2679 /* check the lifetime */
2680 if (!valid_lft || prefered_lft > valid_lft)
2681 return -EINVAL;
2682
53bd6749
JP		 2683 if (ifa_flags & IFA_F_MANAGETEMPADDR && plen != 64)
2684 return -EINVAL;
2685
af284937
DL		 2686 dev = __dev_get_by_index(net, ifindex);
2687 if (!dev)
1da177e4 2688 return -ENODEV;
1ab1457c 2689
64e724f6
BH		 2690 idev = addrconf_add_dev(dev);
2691 if (IS_ERR(idev))
2692 return PTR_ERR(idev);
1da177e4 2693
93a714d6
MC		 2694 if (ifa_flags & IFA_F_MCAUTOJOIN) {
2695 int ret = ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2696 true, pfx, ifindex);
2697
2698 if (ret < 0)
2699 return ret;
2700 }
2701
1da177e4
LT		 2702 scope = ipv6_addr_scope(pfx);
2703
4bed72e4
YH		 2704 timeout = addrconf_timeout_fixup(valid_lft, HZ);
2705 if (addrconf_finite_timeout(timeout)) {
2706 expires = jiffies_to_clock_t(timeout * HZ);
2707 valid_lft = timeout;
6f704992 2708 flags = RTF_EXPIRES;
4bed72e4
YH		 2709 } else {
2710 expires = 0;
2711 flags = 0;
2712 ifa_flags |= IFA_F_PERMANENT;
6f704992 2713 }
0778769d 2714
4bed72e4
YH		 2715 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
2716 if (addrconf_finite_timeout(timeout)) {
2717 if (timeout == 0)
2718 ifa_flags |= IFA_F_DEPRECATED;
2719 prefered_lft = timeout;
2720 }
0778769d 2721
8a226b2c
JB		 2722 ifp = ipv6_add_addr(idev, pfx, peer_pfx, plen, scope, ifa_flags,
2723 valid_lft, prefered_lft);
0778769d 2724
1da177e4 2725 if (!IS_ERR(ifp)) {
761aac73
TH		 2726 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) {
2727 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
2728 expires, flags);
2729 }
2730
95c385b4
NH		 2731 /*
2732 * Note that section 3.1 of RFC 4429 indicates
2733 * that the Optimistic flag should not be set for
2734 * manually configured addresses
2735 */
cf22f9a2 2736 addrconf_dad_start(ifp);
53bd6749
JP		 2737 if (ifa_flags & IFA_F_MANAGETEMPADDR)
2738 manage_tempaddrs(idev, ifp, valid_lft, prefered_lft,
2739 true, jiffies);
1da177e4 2740 in6_ifa_put(ifp);
c15b1cca 2741 addrconf_verify_rtnl();
1da177e4 2742 return 0;
93a714d6
MC		 2743 } else if (ifa_flags & IFA_F_MCAUTOJOIN) {
2744 ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2745 false, pfx, ifindex);
1da177e4
LT		 2746 }
2747
2748 return PTR_ERR(ifp);
2749}
2750
6046d5b4
HK		 2751static int inet6_addr_del(struct net *net, int ifindex, u32 ifa_flags,
2752 const struct in6_addr *pfx, unsigned int plen)
1da177e4
LT		 2753{
2754 struct inet6_ifaddr *ifp;
2755 struct inet6_dev *idev;
2756 struct net_device *dev;
1ab1457c 2757
24ef0da7
TG		 2758 if (plen > 128)
2759 return -EINVAL;
2760
af284937
DL		 2761 dev = __dev_get_by_index(net, ifindex);
2762 if (!dev)
1da177e4
LT		 2763 return -ENODEV;
2764
e5d08d71 2765 idev = __in6_dev_get(dev);
63159f29 2766 if (!idev)
1da177e4
LT		 2767 return -ENXIO;
2768
2769 read_lock_bh(&idev->lock);
502a2ffd 2770 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1da177e4
LT		 2771 if (ifp->prefix_len == plen &&
2772 ipv6_addr_equal(pfx, &ifp->addr)) {
2773 in6_ifa_hold(ifp);
2774 read_unlock_bh(&idev->lock);
1ab1457c 2775
6046d5b4
HK		 2776 if (!(ifp->flags & IFA_F_TEMPORARY) &&
2777 (ifa_flags & IFA_F_MANAGETEMPADDR))
2778 manage_tempaddrs(idev, ifp, 0, 0, false,
2779 jiffies);
1da177e4 2780 ipv6_del_addr(ifp);
6046d5b4 2781 addrconf_verify_rtnl();
93a714d6
MC		 2782 if (ipv6_addr_is_multicast(pfx)) {
2783 ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2784 false, pfx, dev->ifindex);
2785 }
1da177e4
LT		 2786 return 0;
2787 }
2788 }
2789 read_unlock_bh(&idev->lock);
2790 return -EADDRNOTAVAIL;
2791}
2792
2793
af284937 2794int addrconf_add_ifaddr(struct net *net, void __user *arg)
1da177e4
LT		 2795{
2796 struct in6_ifreq ireq;
2797 int err;
1ab1457c 2798
af31f412 2799 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1da177e4 2800 return -EPERM;
1ab1457c 2801
1da177e4
LT		 2802 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2803 return -EFAULT;
2804
2805 rtnl_lock();
caeaba79 2806 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, NULL,
af284937
DL		 2807 ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2808 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
1da177e4
LT		 2809 rtnl_unlock();
2810 return err;
2811}
2812
af284937 2813int addrconf_del_ifaddr(struct net *net, void __user *arg)
1da177e4
LT		 2814{
2815 struct in6_ifreq ireq;
2816 int err;
1ab1457c 2817
af31f412 2818 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1da177e4
LT		 2819 return -EPERM;
2820
2821 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2822 return -EFAULT;
2823
2824 rtnl_lock();
6046d5b4 2825 err = inet6_addr_del(net, ireq.ifr6_ifindex, 0, &ireq.ifr6_addr,
af284937 2826 ireq.ifr6_prefixlen);
1da177e4
LT		 2827 rtnl_unlock();
2828 return err;
2829}
2830
b5f348e5
IJ		 2831static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
2832 int plen, int scope)
2833{
2834 struct inet6_ifaddr *ifp;
2835
8a226b2c 2836 ifp = ipv6_add_addr(idev, addr, NULL, plen,
07edd741
HFS		 2837 scope, IFA_F_PERMANENT,
2838 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
b5f348e5
IJ		 2839 if (!IS_ERR(ifp)) {
2840 spin_lock_bh(&ifp->lock);
2841 ifp->flags &= ~IFA_F_TENTATIVE;
2842 spin_unlock_bh(&ifp->lock);
2843 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2844 in6_ifa_put(ifp);
2845 }
2846}
2847
07a93626 2848#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4
LT		 2849static void sit_add_v4_addrs(struct inet6_dev *idev)
2850{
1da177e4
LT		 2851 struct in6_addr addr;
2852 struct net_device *dev;
c346dca1 2853 struct net *net = dev_net(idev->dev);
929c9cf3 2854 int scope, plen;
f0e2acfa 2855 u32 pflags = 0;
1da177e4
LT		 2856
2857 ASSERT_RTNL();
2858
2859 memset(&addr, 0, sizeof(struct in6_addr));
2860 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2861
2862 if (idev->dev->flags&IFF_POINTOPOINT) {
2863 addr.s6_addr32[0] = htonl(0xfe800000);
2864 scope = IFA_LINK;
929c9cf3 2865 plen = 64;
1da177e4
LT		 2866 } else {
2867 scope = IPV6_ADDR_COMPATv4;
929c9cf3 2868 plen = 96;
f0e2acfa 2869 pflags |= RTF_NONEXTHOP;
1da177e4
LT		 2870 }
2871
2872 if (addr.s6_addr32[3]) {
929c9cf3 2873 add_addr(idev, &addr, plen, scope);
f0e2acfa 2874 addrconf_prefix_route(&addr, plen, idev->dev, 0, pflags);
1da177e4
LT		 2875 return;
2876 }
2877
6fda7350 2878 for_each_netdev(net, dev) {
8e5e8f30 2879 struct in_device *in_dev = __in_dev_get_rtnl(dev);
1da177e4 2880 if (in_dev && (dev->flags & IFF_UP)) {
8e5e8f30 2881 struct in_ifaddr *ifa;
1da177e4
LT		 2882
2883 int flag = scope;
2884
2885 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
1da177e4
LT		 2886
2887 addr.s6_addr32[3] = ifa->ifa_local;
2888
2889 if (ifa->ifa_scope == RT_SCOPE_LINK)
2890 continue;
2891 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2892 if (idev->dev->flags&IFF_POINTOPOINT)
2893 continue;
2894 flag |= IFA_HOST;
2895 }
1da177e4 2896
b5f348e5 2897 add_addr(idev, &addr, plen, flag);
f0e2acfa
ND		 2898 addrconf_prefix_route(&addr, plen, idev->dev, 0,
2899 pflags);
1da177e4
LT		 2900 }
2901 }
1ab1457c 2902 }
1da177e4 2903}
0be669bb 2904#endif
1da177e4
LT		 2905
2906static void init_loopback(struct net_device *dev)
2907{
2908 struct inet6_dev *idev;
25fb6ca4
BK		 2909 struct net_device *sp_dev;
2910 struct inet6_ifaddr *sp_ifa;
2911 struct rt6_info *sp_rt;
1da177e4
LT		 2912
2913 /* ::1 */
2914
2915 ASSERT_RTNL();
2916
e5d08d71 2917 idev = ipv6_find_idev(dev);
63159f29 2918 if (!idev) {
91df42be 2919 pr_debug("%s: add_dev failed\n", __func__);
1da177e4
LT		 2920 return;
2921 }
2922
b5f348e5 2923 add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
25fb6ca4
BK		 2924
2925 /* Add routes to other interface's IPv6 addresses */
2926 for_each_netdev(dev_net(dev), sp_dev) {
2927 if (!strcmp(sp_dev->name, dev->name))
2928 continue;
2929
2930 idev = __in6_dev_get(sp_dev);
2931 if (!idev)
2932 continue;
2933
2934 read_lock_bh(&idev->lock);
2935 list_for_each_entry(sp_ifa, &idev->addr_list, if_list) {
2936
2937 if (sp_ifa->flags & (IFA_F_DADFAILED | IFA_F_TENTATIVE))
2938 continue;
2939
33d99113
G		 2940 if (sp_ifa->rt) {
2941 /* This dst has been added to garbage list when
2942 * lo device down, release this obsolete dst and
2943 * reallocate a new router for ifa.
2944 */
2945 if (sp_ifa->rt->dst.obsolete > 0) {
2946 ip6_rt_put(sp_ifa->rt);
2947 sp_ifa->rt = NULL;
2948 } else {
2949 continue;
2950 }
2951 }
a881ae1f 2952
57ec0afe 2953 sp_rt = addrconf_dst_alloc(idev, &sp_ifa->addr, false);
25fb6ca4
BK		 2954
2955 /* Failure cases are ignored */
534c8779
G		 2956 if (!IS_ERR(sp_rt)) {
2957 sp_ifa->rt = sp_rt;
25fb6ca4 2958 ip6_ins_rt(sp_rt);
534c8779 2959 }
25fb6ca4
BK		 2960 }
2961 read_unlock_bh(&idev->lock);
2962 }
1da177e4
LT		 2963}
2964
2ad3ed59
AA		 2965void addrconf_add_linklocal(struct inet6_dev *idev,
2966 const struct in6_addr *addr, u32 flags)
1da177e4 2967{
8e5e8f30 2968 struct inet6_ifaddr *ifp;
64236f3f 2969 u32 addr_flags = flags | IFA_F_PERMANENT;
95c385b4
NH		 2970
2971#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2972 if (idev->cnf.optimistic_dad &&
702beb87 2973 !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
95c385b4
NH		 2974 addr_flags |= IFA_F_OPTIMISTIC;
2975#endif
1da177e4 2976
07edd741
HFS		 2977 ifp = ipv6_add_addr(idev, addr, NULL, 64, IFA_LINK, addr_flags,
2978 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
1da177e4 2979 if (!IS_ERR(ifp)) {
46d48046 2980 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
cf22f9a2 2981 addrconf_dad_start(ifp);
1da177e4
LT		 2982 in6_ifa_put(ifp);
2983 }
2984}
2ad3ed59 2985EXPORT_SYMBOL_GPL(addrconf_add_linklocal);
1da177e4 2986
622c81d5
HFS		 2987static bool ipv6_reserved_interfaceid(struct in6_addr address)
2988{
2989 if ((address.s6_addr32[2] | address.s6_addr32[3]) == 0)
2990 return true;
2991
2992 if (address.s6_addr32[2] == htonl(0x02005eff) &&
2993 ((address.s6_addr32[3] & htonl(0xfe000000)) == htonl(0xfe000000)))
2994 return true;
2995
2996 if (address.s6_addr32[2] == htonl(0xfdffffff) &&
2997 ((address.s6_addr32[3] & htonl(0xffffff80)) == htonl(0xffffff80)))
2998 return true;
2999
3000 return false;
3001}
3002
3003static int ipv6_generate_stable_address(struct in6_addr *address,
3004 u8 dad_count,
3005 const struct inet6_dev *idev)
3006{
622c81d5
HFS		 3007 static DEFINE_SPINLOCK(lock);
3008 static __u32 digest[SHA_DIGEST_WORDS];
3009 static __u32 workspace[SHA_WORKSPACE_WORDS];
3010
3011 static union {
3012 char __data[SHA_MESSAGE_BYTES];
3013 struct {
3014 struct in6_addr secret;
ff40217e 3015 __be32 prefix[2];
622c81d5
HFS		 3016 unsigned char hwaddr[MAX_ADDR_LEN];
3017 u8 dad_count;
3018 } __packed;
3019 } data;
3020
3021 struct in6_addr secret;
3022 struct in6_addr temp;
3023 struct net *net = dev_net(idev->dev);
3024
3025 BUILD_BUG_ON(sizeof(data.__data) != sizeof(data));
3026
3027 if (idev->cnf.stable_secret.initialized)
3028 secret = idev->cnf.stable_secret.secret;
3029 else if (net->ipv6.devconf_dflt->stable_secret.initialized)
3030 secret = net->ipv6.devconf_dflt->stable_secret.secret;
3031 else
3032 return -1;
3033
3034retry:
3035 spin_lock_bh(&lock);
3036
3037 sha_init(digest);
3038 memset(&data, 0, sizeof(data));
3039 memset(workspace, 0, sizeof(workspace));
3040 memcpy(data.hwaddr, idev->dev->perm_addr, idev->dev->addr_len);
ff40217e
HFS		 3041 data.prefix[0] = address->s6_addr32[0];
3042 data.prefix[1] = address->s6_addr32[1];
622c81d5
HFS		 3043 data.secret = secret;
3044 data.dad_count = dad_count;
3045
3046 sha_transform(digest, data.__data, workspace);
3047
3048 temp = *address;
ff40217e
HFS		 3049 temp.s6_addr32[2] = (__force __be32)digest[0];
3050 temp.s6_addr32[3] = (__force __be32)digest[1];
622c81d5
HFS		 3051
3052 spin_unlock_bh(&lock);
3053
3054 if (ipv6_reserved_interfaceid(temp)) {
3055 dad_count++;
1855b7c3 3056 if (dad_count > dev_net(idev->dev)->ipv6.sysctl.idgen_retries)
622c81d5
HFS		 3057 return -1;
3058 goto retry;
3059 }
3060
3061 *address = temp;
3062 return 0;
3063}
3064
cc9da6cc
BM		 3065static void ipv6_gen_mode_random_init(struct inet6_dev *idev)
3066{
3067 struct ipv6_stable_secret *s = &idev->cnf.stable_secret;
3068
3069 if (s->initialized)
3070 return;
3071 s = &idev->cnf.stable_secret;
3072 get_random_bytes(&s->secret, sizeof(s->secret));
3073 s->initialized = true;
3074}
3075
bc91b0f0
JP		 3076static void addrconf_addr_gen(struct inet6_dev *idev, bool prefix_route)
3077{
622c81d5
HFS		 3078 struct in6_addr addr;
3079
ca254490
DA		 3080 /* no link local addresses on L3 master devices */
3081 if (netif_is_l3_master(idev->dev))
3082 return;
3083
622c81d5 3084 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
bc91b0f0 3085
cc9da6cc
BM		 3086 switch (idev->addr_gen_mode) {
3087 case IN6_ADDR_GEN_MODE_RANDOM:
3088 ipv6_gen_mode_random_init(idev);
3089 /* fallthrough */
3090 case IN6_ADDR_GEN_MODE_STABLE_PRIVACY:
622c81d5 3091 if (!ipv6_generate_stable_address(&addr, 0, idev))
64236f3f
HFS		 3092 addrconf_add_linklocal(idev, &addr,
3093 IFA_F_STABLE_PRIVACY);
622c81d5
HFS		 3094 else if (prefix_route)
3095 addrconf_prefix_route(&addr, 64, idev->dev, 0, 0);
cc9da6cc
BM		 3096 break;
3097 case IN6_ADDR_GEN_MODE_EUI64:
bc91b0f0
JP		 3098 /* addrconf_add_linklocal also adds a prefix_route and we
3099 * only need to care about prefix routes if ipv6_generate_eui64
3100 * couldn't generate one.
3101 */
3102 if (ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) == 0)
64236f3f 3103 addrconf_add_linklocal(idev, &addr, 0);
bc91b0f0
JP		 3104 else if (prefix_route)
3105 addrconf_prefix_route(&addr, 64, idev->dev, 0, 0);
cc9da6cc
BM		 3106 break;
3107 case IN6_ADDR_GEN_MODE_NONE:
3108 default:
3109 /* will not add any link local address */
3110 break;
bc91b0f0
JP		 3111 }
3112}
3113
1da177e4
LT		 3114static void addrconf_dev_config(struct net_device *dev)
3115{
8e5e8f30 3116 struct inet6_dev *idev;
1da177e4
LT		 3117
3118 ASSERT_RTNL();
3119
74235a25
HX		 3120 if ((dev->type != ARPHRD_ETHER) &&
3121 (dev->type != ARPHRD_FDDI) &&
74235a25 3122 (dev->type != ARPHRD_ARCNET) &&
06a4c1c5 3123 (dev->type != ARPHRD_INFINIBAND) &&
e837735e 3124 (dev->type != ARPHRD_IEEE1394) &&
e74bccb8 3125 (dev->type != ARPHRD_TUNNEL6) &&
cc9da6cc
BM		 3126 (dev->type != ARPHRD_6LOWPAN) &&
3127 (dev->type != ARPHRD_NONE)) {
74235a25
HX		 3128 /* Alas, we support only Ethernet autoconfiguration. */
3129 return;
3130 }
3131
1da177e4 3132 idev = addrconf_add_dev(dev);
64e724f6 3133 if (IS_ERR(idev))
1da177e4
LT		 3134 return;
3135
cc9da6cc
BM		 3136 /* this device type has no EUI support */
3137 if (dev->type == ARPHRD_NONE &&
3138 idev->addr_gen_mode == IN6_ADDR_GEN_MODE_EUI64)
3139 idev->addr_gen_mode = IN6_ADDR_GEN_MODE_RANDOM;
3140
bc91b0f0 3141 addrconf_addr_gen(idev, false);
1da177e4
LT		 3142}
3143
07a93626 3144#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4
LT		 3145static void addrconf_sit_config(struct net_device *dev)
3146{
3147 struct inet6_dev *idev;
3148
3149 ASSERT_RTNL();
3150
1ab1457c
YH		 3151 /*
3152 * Configure the tunnel with one of our IPv4
3153 * addresses... we should configure all of
1da177e4
LT		 3154 * our v4 addrs in the tunnel
3155 */
3156
e5d08d71 3157 idev = ipv6_find_idev(dev);
63159f29 3158 if (!idev) {
91df42be 3159 pr_debug("%s: add_dev failed\n", __func__);
1da177e4
LT		 3160 return;
3161 }
3162
c7dc89c0 3163 if (dev->priv_flags & IFF_ISATAP) {
bc91b0f0 3164 addrconf_addr_gen(idev, false);
c7dc89c0
FT		 3165 return;
3166 }
3167
1da177e4
LT		 3168 sit_add_v4_addrs(idev);
3169
62b54dd9 3170 if (dev->flags&IFF_POINTOPOINT)
1da177e4 3171 addrconf_add_mroute(dev);
1da177e4 3172}
0be669bb 3173#endif
1da177e4 3174
07a93626 3175#if IS_ENABLED(CONFIG_NET_IPGRE)
aee80b54 3176static void addrconf_gre_config(struct net_device *dev)
3177{
3178 struct inet6_dev *idev;
aee80b54 3179
aee80b54 3180 ASSERT_RTNL();
3181
e5d08d71 3182 idev = ipv6_find_idev(dev);
63159f29 3183 if (!idev) {
91df42be 3184 pr_debug("%s: add_dev failed\n", __func__);
aee80b54 3185 return;
3186 }
3187
bc91b0f0 3188 addrconf_addr_gen(idev, true);
d9e4ce65
HFS		 3189 if (dev->flags & IFF_POINTOPOINT)
3190 addrconf_add_mroute(dev);
aee80b54 3191}
3192#endif
3193
f1705ec1
DA		 3194static int fixup_permanent_addr(struct inet6_dev *idev,
3195 struct inet6_ifaddr *ifp)
3196{
3197 if (!ifp->rt) {
3198 struct rt6_info *rt;
3199
3200 rt = addrconf_dst_alloc(idev, &ifp->addr, false);
3201 if (unlikely(IS_ERR(rt)))
3202 return PTR_ERR(rt);
3203
3204 ifp->rt = rt;
3205 }
3206
3207 if (!(ifp->flags & IFA_F_NOPREFIXROUTE)) {
3208 addrconf_prefix_route(&ifp->addr, ifp->prefix_len,
3209 idev->dev, 0, 0);
3210 }
3211
3212 addrconf_dad_start(ifp);
3213
3214 return 0;
3215}
3216
3217static void addrconf_permanent_addr(struct net_device *dev)
3218{
3219 struct inet6_ifaddr *ifp, *tmp;
3220 struct inet6_dev *idev;
3221
3222 idev = __in6_dev_get(dev);
3223 if (!idev)
3224 return;
3225
3226 write_lock_bh(&idev->lock);
3227
3228 list_for_each_entry_safe(ifp, tmp, &idev->addr_list, if_list) {
3229 if ((ifp->flags & IFA_F_PERMANENT) &&
3230 fixup_permanent_addr(idev, ifp) < 0) {
3231 write_unlock_bh(&idev->lock);
3232 ipv6_del_addr(ifp);
3233 write_lock_bh(&idev->lock);
3234
3235 net_info_ratelimited("%s: Failed to add prefix route for address %pI6c; dropping\n",
3236 idev->dev->name, &ifp->addr);
3237 }
3238 }
3239
3240 write_unlock_bh(&idev->lock);
3241}
3242
1ab1457c 3243static int addrconf_notify(struct notifier_block *this, unsigned long event,
351638e7 3244 void *ptr)
1da177e4 3245{
351638e7 3246 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
4f7f34ea 3247 struct netdev_notifier_changeupper_info *info;
748e2d93 3248 struct inet6_dev *idev = __in6_dev_get(dev);
c5e33bdd 3249 int run_pending = 0;
b217d616 3250 int err;
1da177e4 3251
e21e8467 3252 switch (event) {
45ba9dd2 3253 case NETDEV_REGISTER:
74235a25 3254 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
45ba9dd2 3255 idev = ipv6_add_dev(dev);
a317a2f1
WC		 3256 if (IS_ERR(idev))
3257 return notifier_from_errno(PTR_ERR(idev));
45ba9dd2
YH		 3258 }
3259 break;
bcdd553f 3260
b7b0b1d2
AD		 3261 case NETDEV_CHANGEMTU:
3262 /* if MTU under IPV6_MIN_MTU stop IPv6 on this interface. */
3263 if (dev->mtu < IPV6_MIN_MTU) {
3264 addrconf_ifdown(dev, 1);
3265 break;
3266 }
3267
3268 if (idev) {
3269 rt6_mtu_change(dev, dev->mtu);
3270 idev->cnf.mtu6 = dev->mtu;
3271 break;
3272 }
3273
3274 /* allocate new idev */
3275 idev = ipv6_add_dev(dev);
3276 if (IS_ERR(idev))
3277 break;
3278
3279 /* device is still not ready */
3280 if (!(idev->if_flags & IF_READY))
3281 break;
3282
3283 run_pending = 1;
3284
3285 /* fall through */
3286
1da177e4 3287 case NETDEV_UP:
3c21edbd 3288 case NETDEV_CHANGE:
c2edacf8
JV		 3289 if (dev->flags & IFF_SLAVE)
3290 break;
3291
3ce62a84
WC		 3292 if (idev && idev->cnf.disable_ipv6)
3293 break;
3294
3c21edbd 3295 if (event == NETDEV_UP) {
38bd10c4
DA		 3296 /* restore routes for permanent addresses */
3297 addrconf_permanent_addr(dev);
3298
f24e3d65 3299 if (!addrconf_qdisc_ok(dev)) {
3c21edbd 3300 /* device is not ready yet. */
f3213831 3301 pr_info("ADDRCONF(NETDEV_UP): %s: link is not ready\n",
3c21edbd
YH		 3302 dev->name);
3303 break;
3304 }
99081049 3305
d31c7b8f
EP		 3306 if (!idev && dev->mtu >= IPV6_MIN_MTU)
3307 idev = ipv6_add_dev(dev);
3308
a317a2f1 3309 if (!IS_ERR_OR_NULL(idev)) {
99081049 3310 idev->if_flags |= IF_READY;
e3ec6cfc
BT		 3311 run_pending = 1;
3312 }
b7b0b1d2 3313 } else if (event == NETDEV_CHANGE) {
f24e3d65 3314 if (!addrconf_qdisc_ok(dev)) {
3c21edbd
YH		 3315 /* device is still not ready. */
3316 break;
3317 }
3318
3319 if (idev) {
bcdd553f 3320 if (idev->if_flags & IF_READY)
3c21edbd
YH		 3321 /* device is already configured. */
3322 break;
3c21edbd
YH		 3323 idev->if_flags |= IF_READY;
3324 }
3325
f3213831
JP		 3326 pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n",
3327 dev->name);
3c21edbd 3328
c5e33bdd 3329 run_pending = 1;
3c21edbd
YH		 3330 }
3331
e21e8467 3332 switch (dev->type) {
07a93626 3333#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4
LT		 3334 case ARPHRD_SIT:
3335 addrconf_sit_config(dev);
3336 break;
aee80b54 3337#endif
07a93626 3338#if IS_ENABLED(CONFIG_NET_IPGRE)
aee80b54 3339 case ARPHRD_IPGRE:
3340 addrconf_gre_config(dev);
3341 break;
0be669bb 3342#endif
1da177e4
LT		 3343 case ARPHRD_LOOPBACK:
3344 init_loopback(dev);
3345 break;
3346
3347 default:
3348 addrconf_dev_config(dev);
3349 break;
3ff50b79 3350 }
bcdd553f 3351
a317a2f1 3352 if (!IS_ERR_OR_NULL(idev)) {
c5e33bdd
YH		 3353 if (run_pending)
3354 addrconf_dad_run(idev);
3355
bcdd553f
SH		 3356 /*
3357 * If the MTU changed during the interface down,
3358 * when the interface up, the changed MTU must be
3359 * reflected in the idev as well as routers.
1da177e4 3360 */
bcdd553f
SH		 3361 if (idev->cnf.mtu6 != dev->mtu &&
3362 dev->mtu >= IPV6_MIN_MTU) {
1da177e4
LT		 3363 rt6_mtu_change(dev, dev->mtu);
3364 idev->cnf.mtu6 = dev->mtu;
3365 }
3366 idev->tstamp = jiffies;
3367 inet6_ifinfo_notify(RTM_NEWLINK, idev);
bcdd553f
SH		 3368
3369 /*
3370 * If the changed mtu during down is lower than
3371 * IPV6_MIN_MTU stop IPv6 on this interface.
1da177e4
LT		 3372 */
3373 if (dev->mtu < IPV6_MIN_MTU)
bcdd553f 3374 addrconf_ifdown(dev, 1);
1da177e4
LT		 3375 }
3376 break;
3377
1da177e4
LT		 3378 case NETDEV_DOWN:
3379 case NETDEV_UNREGISTER:
3380 /*
3381 * Remove all addresses from this interface.
3382 */
3383 addrconf_ifdown(dev, event != NETDEV_DOWN);
3384 break;
3c21edbd 3385
1da177e4 3386 case NETDEV_CHANGENAME:
1da177e4 3387 if (idev) {
5632c515 3388 snmp6_unregister_dev(idev);
408c4768 3389 addrconf_sysctl_unregister(idev);
a317a2f1 3390 err = addrconf_sysctl_register(idev);
b217d616
HX		 3391 if (err)
3392 return notifier_from_errno(err);
a317a2f1
WC		 3393 err = snmp6_register_dev(idev);
3394 if (err) {
3395 addrconf_sysctl_unregister(idev);
3396 return notifier_from_errno(err);
3397 }
5632c515 3398 }
1da177e4 3399 break;
bcdd553f 3400
93d9b7d7
JP		 3401 case NETDEV_PRE_TYPE_CHANGE:
3402 case NETDEV_POST_TYPE_CHANGE:
3ef0952c
AL		 3403 if (idev)
3404 addrconf_type_change(dev, event);
75c78500 3405 break;
4f7f34ea
DA		 3406
3407 case NETDEV_CHANGEUPPER:
3408 info = ptr;
3409
3410 /* flush all routes if dev is linked to or unlinked from
3411 * an L3 master device (e.g., VRF)
3412 */
3413 if (info->upper_dev && netif_is_l3_master(info->upper_dev))
3414 addrconf_ifdown(dev, 0);
3ff50b79 3415 }
1da177e4
LT		 3416
3417 return NOTIFY_OK;
3418}
3419
3420/*
3421 * addrconf module should be notified of a device going up
3422 */
3423static struct notifier_block ipv6_dev_notf = {
3424 .notifier_call = addrconf_notify,
1da177e4
LT		 3425};
3426
93d9b7d7 3427static void addrconf_type_change(struct net_device *dev, unsigned long event)
75c78500
MS		 3428{
3429 struct inet6_dev *idev;
3430 ASSERT_RTNL();
3431
3432 idev = __in6_dev_get(dev);
3433
93d9b7d7 3434 if (event == NETDEV_POST_TYPE_CHANGE)
75c78500 3435 ipv6_mc_remap(idev);
93d9b7d7 3436 else if (event == NETDEV_PRE_TYPE_CHANGE)
75c78500
MS		 3437 ipv6_mc_unmap(idev);
3438}
3439
70af921d
DA		 3440static bool addr_is_local(const struct in6_addr *addr)
3441{
3442 return ipv6_addr_type(addr) &
3443 (IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK);
3444}
3445
1da177e4
LT		 3446static int addrconf_ifdown(struct net_device *dev, int how)
3447{
c346dca1 3448 struct net *net = dev_net(dev);
502a2ffd 3449 struct inet6_dev *idev;
f1705ec1
DA		 3450 struct inet6_ifaddr *ifa, *tmp;
3451 struct list_head del_list;
3452 int _keep_addr;
3453 bool keep_addr;
73a8bd74 3454 int state, i;
1da177e4
LT		 3455
3456 ASSERT_RTNL();
3457
73a8bd74
DM		 3458 rt6_ifdown(net, dev);
3459 neigh_ifdown(&nd_tbl, dev);
1da177e4
LT		 3460
3461 idev = __in6_dev_get(dev);
63159f29 3462 if (!idev)
1da177e4
LT		 3463 return -ENODEV;
3464
bcdd553f
SH		 3465 /*
3466 * Step 1: remove reference to ipv6 device from parent device.
3467 * Do not dev_put!
1da177e4 3468 */
439e2385 3469 if (how) {
1da177e4 3470 idev->dead = 1;
8814c4b5
YH		 3471
3472 /* protected by rtnl_lock */
a9b3cd7f 3473 RCU_INIT_POINTER(dev->ip6_ptr, NULL);
1da177e4
LT		 3474
3475 /* Step 1.5: remove snmp6 entry */
3476 snmp6_unregister_dev(idev);
3477
3478 }
3479
f1705ec1
DA		 3480 /* aggregate the system setting and interface setting */
3481 _keep_addr = net->ipv6.devconf_all->keep_addr_on_down;
3482 if (!_keep_addr)
3483 _keep_addr = idev->cnf.keep_addr_on_down;
3484
3485 /* combine the user config with event to determine if permanent
3486 * addresses are to be removed from address hash table
3487 */
3488 keep_addr = !(how || _keep_addr <= 0);
3489
73a8bd74
DM		 3490 /* Step 2: clear hash table */
3491 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3492 struct hlist_head *h = &inet6_addr_lst[i];
73a8bd74
DM		 3493
3494 spin_lock_bh(&addrconf_hash_lock);
67ba4152 3495restart:
b67bfe0d 3496 hlist_for_each_entry_rcu(ifa, h, addr_lst) {
73a8bd74 3497 if (ifa->idev == idev) {
c15b1cca 3498 addrconf_del_dad_work(ifa);
f1705ec1
DA		 3499 /* combined flag + permanent flag decide if
3500 * address is retained on a down event
3501 */
3502 if (!keep_addr ||
70af921d
DA		 3503 !(ifa->flags & IFA_F_PERMANENT) ||
3504 addr_is_local(&ifa->addr)) {
f1705ec1
DA		 3505 hlist_del_init_rcu(&ifa->addr_lst);
3506 goto restart;
3507 }
73a8bd74
DM		 3508 }
3509 }
3510 spin_unlock_bh(&addrconf_hash_lock);
3511 }
3512
1da177e4
LT		 3513 write_lock_bh(&idev->lock);
3514
b7b1bfce
HFS		 3515 addrconf_del_rs_timer(idev);
3516
bcdd553f 3517 /* Step 2: clear flags for stateless addrconf */
439e2385 3518 if (!how)
3c21edbd 3519 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
1da177e4 3520
439e2385 3521 if (how && del_timer(&idev->regen_timer))
1da177e4
LT		 3522 in6_dev_put(idev);
3523
bcdd553f 3524 /* Step 3: clear tempaddr list */
372e6c8f 3525 while (!list_empty(&idev->tempaddr_list)) {
3526 ifa = list_first_entry(&idev->tempaddr_list,
3527 struct inet6_ifaddr, tmp_list);
3528 list_del(&ifa->tmp_list);
1da177e4
LT		 3529 write_unlock_bh(&idev->lock);
3530 spin_lock_bh(&ifa->lock);
3531
3532 if (ifa->ifpub) {
3533 in6_ifa_put(ifa->ifpub);
3534 ifa->ifpub = NULL;
3535 }
3536 spin_unlock_bh(&ifa->lock);
3537 in6_ifa_put(ifa);
3538 write_lock_bh(&idev->lock);
3539 }
8f37ada5 3540
f1705ec1
DA		 3541 /* re-combine the user config with event to determine if permanent
3542 * addresses are to be removed from the interface list
3543 */
3544 keep_addr = (!how && _keep_addr > 0);
84e8b803 3545
f1705ec1
DA		 3546 INIT_LIST_HEAD(&del_list);
3547 list_for_each_entry_safe(ifa, tmp, &idev->addr_list, if_list) {
38bd10c4
DA		 3548 struct rt6_info *rt = NULL;
3549
f1705ec1 3550 addrconf_del_dad_work(ifa);
84e8b803 3551
73a8bd74 3552 write_unlock_bh(&idev->lock);
8e8e676d 3553 spin_lock_bh(&ifa->lock);
f1705ec1 3554
70af921d
DA		 3555 if (keep_addr && (ifa->flags & IFA_F_PERMANENT) &&
3556 !addr_is_local(&ifa->addr)) {
f1705ec1
DA		 3557 /* set state to skip the notifier below */
3558 state = INET6_IFADDR_STATE_DEAD;
3559 ifa->state = 0;
3560 if (!(ifa->flags & IFA_F_NODAD))
3561 ifa->flags |= IFA_F_TENTATIVE;
38bd10c4
DA		 3562
3563 rt = ifa->rt;
3564 ifa->rt = NULL;
f1705ec1
DA		 3565 } else {
3566 state = ifa->state;
3567 ifa->state = INET6_IFADDR_STATE_DEAD;
3568
3569 list_del(&ifa->if_list);
3570 list_add(&ifa->if_list, &del_list);
3571 }
3572
8e8e676d 3573 spin_unlock_bh(&ifa->lock);
9d82ca98 3574
38bd10c4
DA		 3575 if (rt)
3576 ip6_del_rt(rt);
3577
73a8bd74
DM		 3578 if (state != INET6_IFADDR_STATE_DEAD) {
3579 __ipv6_ifa_notify(RTM_DELADDR, ifa);
f88c91dd 3580 inet6addr_notifier_call_chain(NETDEV_DOWN, ifa);
27bdb2ab 3581 }
8f37ada5 3582
73a8bd74
DM		 3583 write_lock_bh(&idev->lock);
3584 }
8f37ada5 3585
1da177e4
LT		 3586 write_unlock_bh(&idev->lock);
3587
f1705ec1
DA		 3588 /* now clean up addresses to be removed */
3589 while (!list_empty(&del_list)) {
3590 ifa = list_first_entry(&del_list,
3591 struct inet6_ifaddr, if_list);
3592 list_del(&ifa->if_list);
3593
3594 in6_ifa_put(ifa);
3595 }
3596
381f4dca
SD		 3597 /* Step 5: Discard anycast and multicast list */
3598 if (how) {
3599 ipv6_ac_destroy_dev(idev);
1da177e4 3600 ipv6_mc_destroy_dev(idev);
381f4dca 3601 } else {
1da177e4 3602 ipv6_mc_down(idev);
381f4dca 3603 }
1da177e4 3604
1da177e4 3605 idev->tstamp = jiffies;
1ab1457c 3606
bcdd553f 3607 /* Last: Shot the device (if unregistered) */
439e2385 3608 if (how) {
408c4768 3609 addrconf_sysctl_unregister(idev);
1da177e4
LT		 3610 neigh_parms_release(&nd_tbl, idev->nd_parms);
3611 neigh_ifdown(&nd_tbl, dev);
3612 in6_dev_put(idev);
3613 }
3614 return 0;
3615}
3616
3617static void addrconf_rs_timer(unsigned long data)
3618{
b7b1bfce 3619 struct inet6_dev *idev = (struct inet6_dev *)data;
caf92bc4 3620 struct net_device *dev = idev->dev;
b7b1bfce 3621 struct in6_addr lladdr;
1da177e4 3622
b7b1bfce 3623 write_lock(&idev->lock);
5b2a1953 3624 if (idev->dead || !(idev->if_flags & IF_READY))
1da177e4
LT		 3625 goto out;
3626
9ba2add3 3627 if (!ipv6_accept_ra(idev))
5b2a1953 3628 goto out;
3629
3630 /* Announcement received after solicitation was sent */
3631 if (idev->if_flags & IF_RA_RCVD)
1da177e4 3632 goto out;
1da177e4 3633
b7b1bfce 3634 if (idev->rs_probes++ < idev->cnf.rtr_solicits) {
caf92bc4
CW		 3635 write_unlock(&idev->lock);
3636 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
3637 ndisc_send_rs(dev, &lladdr,
b7b1bfce
HFS		 3638 &in6addr_linklocal_allrouters);
3639 else
caf92bc4 3640 goto put;
1da177e4 3641
caf92bc4 3642 write_lock(&idev->lock);
b7b1bfce
HFS		 3643 /* The wait after the last probe can be shorter */
3644 addrconf_mod_rs_timer(idev, (idev->rs_probes ==
3645 idev->cnf.rtr_solicits) ?
3646 idev->cnf.rtr_solicit_delay :
3647 idev->cnf.rtr_solicit_interval);
1da177e4 3648 } else {
1da177e4
LT		 3649 /*
3650 * Note: we do not support deprecated "all on-link"
3651 * assumption any longer.
3652 */
91df42be 3653 pr_debug("%s: no IPv6 routers present\n", idev->dev->name);
1da177e4
LT		 3654 }
3655
3656out:
b7b1bfce 3657 write_unlock(&idev->lock);
caf92bc4 3658put:
b7b1bfce 3659 in6_dev_put(idev);
1da177e4
LT		 3660}
3661
3662/*
3663 * Duplicate Address Detection
3664 */
3c21edbd
YH		 3665static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
3666{
3667 unsigned long rand_num;
3668 struct inet6_dev *idev = ifp->idev;
3669
95c385b4
NH		 3670 if (ifp->flags & IFA_F_OPTIMISTIC)
3671 rand_num = 0;
3672 else
63862b5b 3673 rand_num = prandom_u32() % (idev->cnf.rtr_solicit_delay ? : 1);
95c385b4 3674
b7b1bfce 3675 ifp->dad_probes = idev->cnf.dad_transmits;
c15b1cca 3676 addrconf_mod_dad_work(ifp, rand_num);
3c21edbd
YH		 3677}
3678
c15b1cca 3679static void addrconf_dad_begin(struct inet6_ifaddr *ifp)
1da177e4
LT		 3680{
3681 struct inet6_dev *idev = ifp->idev;
3682 struct net_device *dev = idev->dev;
16186a82 3683 bool notify = false;
1da177e4
LT		 3684
3685 addrconf_join_solict(dev, &ifp->addr);
3686
63862b5b 3687 prandom_seed((__force u32) ifp->addr.s6_addr32[3]);
1da177e4
LT		 3688
3689 read_lock_bh(&idev->lock);
622ccdf1 3690 spin_lock(&ifp->lock);
e9d3e084 3691 if (ifp->state == INET6_IFADDR_STATE_DEAD)
1da177e4 3692 goto out;
1da177e4
LT		 3693
3694 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
1b34be74 3695 idev->cnf.accept_dad < 1 ||
55ebaef1
NT		 3696 !(ifp->flags&IFA_F_TENTATIVE) ||
3697 ifp->flags & IFA_F_NODAD) {
cc411d0b 3698 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
21809faf 3699 spin_unlock(&ifp->lock);
1da177e4
LT		 3700 read_unlock_bh(&idev->lock);
3701
3702 addrconf_dad_completed(ifp);
3703 return;
3704 }
3705
6732bade 3706 if (!(idev->if_flags & IF_READY)) {
21809faf 3707 spin_unlock(&ifp->lock);
6732bade 3708 read_unlock_bh(&idev->lock);
3c21edbd 3709 /*
590a9887 3710 * If the device is not ready:
3c21edbd
YH		 3711 * - keep it tentative if it is a permanent address.
3712 * - otherwise, kill it.
3713 */
3714 in6_ifa_hold(ifp);
cc411d0b 3715 addrconf_dad_stop(ifp, 0);
6732bade 3716 return;
3c21edbd 3717 }
95c385b4
NH		 3718
3719 /*
3720 * Optimistic nodes can start receiving
3721 * Frames right away
3722 */
7fd2561e 3723 if (ifp->flags & IFA_F_OPTIMISTIC) {
95c385b4 3724 ip6_ins_rt(ifp->rt);
7fd2561e
EK		 3725 if (ipv6_use_optimistic_addr(idev)) {
3726 /* Because optimistic nodes can use this address,
3727 * notify listeners. If DAD fails, RTM_DELADDR is sent.
3728 */
16186a82 3729 notify = true;
7fd2561e
EK		 3730 }
3731 }
95c385b4 3732
6732bade 3733 addrconf_dad_kick(ifp);
1da177e4 3734out:
622ccdf1 3735 spin_unlock(&ifp->lock);
1da177e4 3736 read_unlock_bh(&idev->lock);
16186a82 3737 if (notify)
3738 ipv6_ifa_notify(RTM_NEWADDR, ifp);
1da177e4
LT		 3739}
3740
c15b1cca 3741static void addrconf_dad_start(struct inet6_ifaddr *ifp)
1da177e4 3742{
c15b1cca
HFS		 3743 bool begin_dad = false;
3744
8e8e676d 3745 spin_lock_bh(&ifp->lock);
c15b1cca
HFS		 3746 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
3747 ifp->state = INET6_IFADDR_STATE_PREDAD;
3748 begin_dad = true;
3749 }
8e8e676d 3750 spin_unlock_bh(&ifp->lock);
c15b1cca
HFS		 3751
3752 if (begin_dad)
3753 addrconf_mod_dad_work(ifp, 0);
3754}
3755
3756static void addrconf_dad_work(struct work_struct *w)
3757{
3758 struct inet6_ifaddr *ifp = container_of(to_delayed_work(w),
3759 struct inet6_ifaddr,
3760 dad_work);
1da177e4 3761 struct inet6_dev *idev = ifp->idev;
1da177e4
LT		 3762 struct in6_addr mcaddr;
3763
c15b1cca
HFS		 3764 enum {
3765 DAD_PROCESS,
3766 DAD_BEGIN,
3767 DAD_ABORT,
3768 } action = DAD_PROCESS;
3769
3770 rtnl_lock();
3771
8e8e676d 3772 spin_lock_bh(&ifp->lock);
c15b1cca
HFS		 3773 if (ifp->state == INET6_IFADDR_STATE_PREDAD) {
3774 action = DAD_BEGIN;
3775 ifp->state = INET6_IFADDR_STATE_DAD;
3776 } else if (ifp->state == INET6_IFADDR_STATE_ERRDAD) {
3777 action = DAD_ABORT;
3778 ifp->state = INET6_IFADDR_STATE_POSTDAD;
3779 }
8e8e676d 3780 spin_unlock_bh(&ifp->lock);
c15b1cca
HFS		 3781
3782 if (action == DAD_BEGIN) {
3783 addrconf_dad_begin(ifp);
3784 goto out;
3785 } else if (action == DAD_ABORT) {
3786 addrconf_dad_stop(ifp, 1);
3787 goto out;
3788 }
3789
b7b1bfce 3790 if (!ifp->dad_probes && addrconf_dad_end(ifp))
f2344a13
HX		 3791 goto out;
3792
c15b1cca 3793 write_lock_bh(&idev->lock);
122e4519 3794 if (idev->dead || !(idev->if_flags & IF_READY)) {
c15b1cca 3795 write_unlock_bh(&idev->lock);
1da177e4
LT		 3796 goto out;
3797 }
21809faf 3798
3799 spin_lock(&ifp->lock);
622ccdf1
HX		 3800 if (ifp->state == INET6_IFADDR_STATE_DEAD) {
3801 spin_unlock(&ifp->lock);
c15b1cca 3802 write_unlock_bh(&idev->lock);
622ccdf1
HX		 3803 goto out;
3804 }
3805
b7b1bfce 3806 if (ifp->dad_probes == 0) {
1da177e4
LT		 3807 /*
3808 * DAD was successful
3809 */
3810
cc411d0b 3811 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
21809faf 3812 spin_unlock(&ifp->lock);
c15b1cca 3813 write_unlock_bh(&idev->lock);
1da177e4
LT		 3814
3815 addrconf_dad_completed(ifp);
3816
3817 goto out;
3818 }
3819
b7b1bfce 3820 ifp->dad_probes--;
c15b1cca
HFS		 3821 addrconf_mod_dad_work(ifp,
3822 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME));
21809faf 3823 spin_unlock(&ifp->lock);
c15b1cca 3824 write_unlock_bh(&idev->lock);
1da177e4
LT		 3825
3826 /* send a neighbour solicitation for our addr */
1da177e4 3827 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
304d888b 3828 ndisc_send_ns(ifp->idev->dev, &ifp->addr, &mcaddr, &in6addr_any);
1da177e4
LT		 3829out:
3830 in6_ifa_put(ifp);
c15b1cca 3831 rtnl_unlock();
1da177e4
LT		 3832}
3833
11ffff75
HFS		 3834/* ifp->idev must be at least read locked */
3835static bool ipv6_lonely_lladdr(struct inet6_ifaddr *ifp)
3836{
3837 struct inet6_ifaddr *ifpiter;
3838 struct inet6_dev *idev = ifp->idev;
3839
602582ca
HFS		 3840 list_for_each_entry_reverse(ifpiter, &idev->addr_list, if_list) {
3841 if (ifpiter->scope > IFA_LINK)
3842 break;
11ffff75
HFS		 3843 if (ifp != ifpiter && ifpiter->scope == IFA_LINK &&
3844 (ifpiter->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE|
3845 IFA_F_OPTIMISTIC|IFA_F_DADFAILED)) ==
3846 IFA_F_PERMANENT)
3847 return false;
3848 }
3849 return true;
3850}
3851
1da177e4
LT		 3852static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
3853{
e21e8467 3854 struct net_device *dev = ifp->idev->dev;
b7b1bfce 3855 struct in6_addr lladdr;
b173ee48 3856 bool send_rs, send_mld;
b7b1bfce 3857
c15b1cca 3858 addrconf_del_dad_work(ifp);
1da177e4
LT		 3859
3860 /*
3861 * Configure the address for reception. Now it is valid.
3862 */
3863
3864 ipv6_ifa_notify(RTM_NEWADDR, ifp);
3865
026359bc
TA		 3866 /* If added prefix is link local and we are prepared to process
3867 router advertisements, start sending router solicitations.
1da177e4
LT		 3868 */
3869
1ec047eb 3870 read_lock_bh(&ifp->idev->lock);
11ffff75 3871 send_mld = ifp->scope == IFA_LINK && ipv6_lonely_lladdr(ifp);
b173ee48
HFS		 3872 send_rs = send_mld &&
3873 ipv6_accept_ra(ifp->idev) &&
1ec047eb 3874 ifp->idev->cnf.rtr_solicits > 0 &&
b173ee48 3875 (dev->flags&IFF_LOOPBACK) == 0;
1ec047eb
HFS		 3876 read_unlock_bh(&ifp->idev->lock);
3877
b173ee48
HFS		 3878 /* While dad is in progress mld report's source address is in6_addrany.
3879 * Resend with proper ll now.
3880 */
3881 if (send_mld)
3882 ipv6_mc_dad_complete(ifp->idev);
3883
1ec047eb 3884 if (send_rs) {
1da177e4
LT		 3885 /*
3886 * If a host as already performed a random delay
3887 * [...] as part of DAD [...] there is no need
3888 * to delay again before sending the first RS
3889 */
1ec047eb 3890 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
b7b1bfce 3891 return;
1ec047eb 3892 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters);
1da177e4 3893
b7b1bfce
HFS		 3894 write_lock_bh(&ifp->idev->lock);
3895 spin_lock(&ifp->lock);
3896 ifp->idev->rs_probes = 1;
1da177e4 3897 ifp->idev->if_flags |= IF_RS_SENT;
b7b1bfce
HFS		 3898 addrconf_mod_rs_timer(ifp->idev,
3899 ifp->idev->cnf.rtr_solicit_interval);
3900 spin_unlock(&ifp->lock);
3901 write_unlock_bh(&ifp->idev->lock);
1da177e4
LT		 3902 }
3903}
3904
e21e8467
SH		 3905static void addrconf_dad_run(struct inet6_dev *idev)
3906{
c5e33bdd
YH		 3907 struct inet6_ifaddr *ifp;
3908
3909 read_lock_bh(&idev->lock);
502a2ffd 3910 list_for_each_entry(ifp, &idev->addr_list, if_list) {
21809faf 3911 spin_lock(&ifp->lock);
f2344a13
HX		 3912 if (ifp->flags & IFA_F_TENTATIVE &&
3913 ifp->state == INET6_IFADDR_STATE_DAD)
3914 addrconf_dad_kick(ifp);
21809faf 3915 spin_unlock(&ifp->lock);
c5e33bdd
YH		 3916 }
3917 read_unlock_bh(&idev->lock);
3918}
3919
1da177e4
LT		 3920#ifdef CONFIG_PROC_FS
3921struct if6_iter_state {
3c40090a 3922 struct seq_net_private p;
1da177e4 3923 int bucket;
1d578303 3924 int offset;
1da177e4
LT		 3925};
3926
1d578303 3927static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos)
1da177e4
LT		 3928{
3929 struct inet6_ifaddr *ifa = NULL;
3930 struct if6_iter_state *state = seq->private;
1218854a 3931 struct net *net = seq_file_net(seq);
1d578303 3932 int p = 0;
1da177e4 3933
1d578303
MM		 3934 /* initial bucket if pos is 0 */
3935 if (pos == 0) {
3936 state->bucket = 0;
3937 state->offset = 0;
3938 }
3939
3940 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
b67bfe0d 3941 hlist_for_each_entry_rcu_bh(ifa, &inet6_addr_lst[state->bucket],
1d578303 3942 addr_lst) {
9f0d3c27
ED		 3943 if (!net_eq(dev_net(ifa->idev->dev), net))
3944 continue;
1d578303
MM		 3945 /* sync with offset */
3946 if (p < state->offset) {
3947 p++;
3948 continue;
3949 }
3950 state->offset++;
9f0d3c27 3951 return ifa;
1d578303
MM		 3952 }
3953
3954 /* prepare for next bucket */
3955 state->offset = 0;
3956 p = 0;
1da177e4 3957 }
c2e21293 3958 return NULL;
1da177e4
LT		 3959}
3960
c2e21293 3961static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
3962 struct inet6_ifaddr *ifa)
1da177e4
LT		 3963{
3964 struct if6_iter_state *state = seq->private;
1218854a 3965 struct net *net = seq_file_net(seq);
1da177e4 3966
b67bfe0d 3967 hlist_for_each_entry_continue_rcu_bh(ifa, addr_lst) {
9f0d3c27
ED		 3968 if (!net_eq(dev_net(ifa->idev->dev), net))
3969 continue;
1d578303 3970 state->offset++;
9f0d3c27 3971 return ifa;
1d578303 3972 }
3c40090a 3973
c2e21293 3974 while (++state->bucket < IN6_ADDR_HSIZE) {
1d578303 3975 state->offset = 0;
b67bfe0d 3976 hlist_for_each_entry_rcu_bh(ifa,
c2e21293 3977 &inet6_addr_lst[state->bucket], addr_lst) {
9f0d3c27
ED		 3978 if (!net_eq(dev_net(ifa->idev->dev), net))
3979 continue;
1d578303 3980 state->offset++;
9f0d3c27 3981 return ifa;
c2e21293 3982 }
1da177e4 3983 }
3c40090a 3984
c2e21293 3985 return NULL;
1da177e4
LT		 3986}
3987
1da177e4 3988static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
4f70ecca 3989 __acquires(rcu_bh)
1da177e4 3990{
5c578aed 3991 rcu_read_lock_bh();
1d578303 3992 return if6_get_first(seq, *pos);
1da177e4
LT		 3993}
3994
3995static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3996{
3997 struct inet6_ifaddr *ifa;
3998
3999 ifa = if6_get_next(seq, v);
4000 ++*pos;
4001 return ifa;
4002}
4003
4004static void if6_seq_stop(struct seq_file *seq, void *v)
4f70ecca 4005 __releases(rcu_bh)
1da177e4 4006{
5c578aed 4007 rcu_read_unlock_bh();
1da177e4
LT		 4008}
4009
4010static int if6_seq_show(struct seq_file *seq, void *v)
4011{
4012 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
971a351c 4013 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
b071195d 4014 &ifp->addr,
1da177e4
LT		 4015 ifp->idev->dev->ifindex,
4016 ifp->prefix_len,
4017 ifp->scope,
971a351c 4018 (u8) ifp->flags,
1da177e4
LT		 4019 ifp->idev->dev->name);
4020 return 0;
4021}
4022
56b3d975 4023static const struct seq_operations if6_seq_ops = {
1da177e4
LT		 4024 .start = if6_seq_start,
4025 .next = if6_seq_next,
4026 .show = if6_seq_show,
4027 .stop = if6_seq_stop,
4028};
4029
4030static int if6_seq_open(struct inode *inode, struct file *file)
4031{
3c40090a
DL		 4032 return seq_open_net(inode, file, &if6_seq_ops,
4033 sizeof(struct if6_iter_state));
1da177e4
LT		 4034}
4035
9a32144e 4036static const struct file_operations if6_fops = {
1da177e4
LT		 4037 .owner = THIS_MODULE,
4038 .open = if6_seq_open,
4039 .read = seq_read,
4040 .llseek = seq_lseek,
3c40090a 4041 .release = seq_release_net,
1da177e4
LT		 4042};
4043
2c8c1e72 4044static int __net_init if6_proc_net_init(struct net *net)
1da177e4 4045{
d4beaa66 4046 if (!proc_create("if_inet6", S_IRUGO, net->proc_net, &if6_fops))
1da177e4
LT		 4047 return -ENOMEM;
4048 return 0;
4049}
4050
2c8c1e72 4051static void __net_exit if6_proc_net_exit(struct net *net)
3c40090a 4052{
ece31ffd 4053 remove_proc_entry("if_inet6", net->proc_net);
3c40090a
DL		 4054}
4055
4056static struct pernet_operations if6_proc_net_ops = {
67ba4152
IM		 4057 .init = if6_proc_net_init,
4058 .exit = if6_proc_net_exit,
3c40090a
DL		 4059};
4060
4061int __init if6_proc_init(void)
4062{
4063 return register_pernet_subsys(&if6_proc_net_ops);
4064}
4065
1da177e4
LT		 4066void if6_proc_exit(void)
4067{
3c40090a 4068 unregister_pernet_subsys(&if6_proc_net_ops);
1da177e4
LT		 4069}
4070#endif /* CONFIG_PROC_FS */
4071
07a93626 4072#if IS_ENABLED(CONFIG_IPV6_MIP6)
3b9f9a1c 4073/* Check if address is a home address configured on any interface. */
b71d1d42 4074int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr)
3b9f9a1c
NT		 4075{
4076 int ret = 0;
c2e21293 4077 struct inet6_ifaddr *ifp = NULL;
ddbe5032 4078 unsigned int hash = inet6_addr_hash(addr);
c2e21293 4079
5c578aed 4080 rcu_read_lock_bh();
b67bfe0d 4081 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
878628fb 4082 if (!net_eq(dev_net(ifp->idev->dev), net))
389f6612 4083 continue;
caad295f 4084 if (ipv6_addr_equal(&ifp->addr, addr) &&
3b9f9a1c
NT		 4085 (ifp->flags & IFA_F_HOMEADDRESS)) {
4086 ret = 1;
4087 break;
4088 }
4089 }
5c578aed 4090 rcu_read_unlock_bh();
3b9f9a1c
NT		 4091 return ret;
4092}
4093#endif
4094
1da177e4
LT		 4095/*
4096 * Periodic address status verification
4097 */
4098
c15b1cca 4099static void addrconf_verify_rtnl(void)
1da177e4 4100{
b2db7564 4101 unsigned long now, next, next_sec, next_sched;
1da177e4 4102 struct inet6_ifaddr *ifp;
1da177e4
LT		 4103 int i;
4104
c15b1cca
HFS		 4105 ASSERT_RTNL();
4106
5c578aed 4107 rcu_read_lock_bh();
1da177e4 4108 now = jiffies;
b2db7564 4109 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
1da177e4 4110
c15b1cca 4111 cancel_delayed_work(&addr_chk_work);
1da177e4 4112
bcdd553f 4113 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
1da177e4 4114restart:
c15b1cca 4115 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[i], addr_lst) {
1da177e4 4116 unsigned long age;
1da177e4 4117
fad8da3e
YA		 4118 /* When setting preferred_lft to a value not zero or
4119 * infinity, while valid_lft is infinity
4120 * IFA_F_PERMANENT has a non-infinity life time.
4121 */
4122 if ((ifp->flags & IFA_F_PERMANENT) &&
4123 (ifp->prefered_lft == INFINITY_LIFE_TIME))
1da177e4
LT		 4124 continue;
4125
4126 spin_lock(&ifp->lock);
b2db7564
YH		 4127 /* We try to batch several events at once. */
4128 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
1da177e4 4129
8f27ebb9
YH		 4130 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
4131 age >= ifp->valid_lft) {
1da177e4
LT		 4132 spin_unlock(&ifp->lock);
4133 in6_ifa_hold(ifp);
1da177e4
LT		 4134 ipv6_del_addr(ifp);
4135 goto restart;
8f27ebb9
YH		 4136 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
4137 spin_unlock(&ifp->lock);
4138 continue;
1da177e4 4139 } else if (age >= ifp->prefered_lft) {
a1ed0526 4140 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
1da177e4
LT		 4141 int deprecate = 0;
4142
4143 if (!(ifp->flags&IFA_F_DEPRECATED)) {
4144 deprecate = 1;
4145 ifp->flags |= IFA_F_DEPRECATED;
4146 }
4147
fad8da3e
YA		 4148 if ((ifp->valid_lft != INFINITY_LIFE_TIME) &&
4149 (time_before(ifp->tstamp + ifp->valid_lft * HZ, next)))
1da177e4
LT		 4150 next = ifp->tstamp + ifp->valid_lft * HZ;
4151
4152 spin_unlock(&ifp->lock);
4153
4154 if (deprecate) {
4155 in6_ifa_hold(ifp);
1da177e4
LT		 4156
4157 ipv6_ifa_notify(0, ifp);
4158 in6_ifa_put(ifp);
4159 goto restart;
4160 }
1da177e4
LT		 4161 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
4162 !(ifp->flags&IFA_F_TENTATIVE)) {
88949cf4 4163 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
4164 ifp->idev->cnf.dad_transmits *
1f9248e5 4165 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME) / HZ;
88949cf4 4166
1da177e4
LT		 4167 if (age >= ifp->prefered_lft - regen_advance) {
4168 struct inet6_ifaddr *ifpub = ifp->ifpub;
4169 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
4170 next = ifp->tstamp + ifp->prefered_lft * HZ;
4171 if (!ifp->regen_count && ifpub) {
4172 ifp->regen_count++;
4173 in6_ifa_hold(ifp);
4174 in6_ifa_hold(ifpub);
4175 spin_unlock(&ifp->lock);
5c578aed 4176
291d809b
HY		 4177 spin_lock(&ifpub->lock);
4178 ifpub->regen_count = 0;
4179 spin_unlock(&ifpub->lock);
1da177e4
LT		 4180 ipv6_create_tempaddr(ifpub, ifp);
4181 in6_ifa_put(ifpub);
4182 in6_ifa_put(ifp);
4183 goto restart;
4184 }
4185 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
4186 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
4187 spin_unlock(&ifp->lock);
1da177e4
LT		 4188 } else {
4189 /* ifp->prefered_lft <= ifp->valid_lft */
4190 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
4191 next = ifp->tstamp + ifp->prefered_lft * HZ;
4192 spin_unlock(&ifp->lock);
4193 }
4194 }
1da177e4
LT		 4195 }
4196
b2db7564
YH		 4197 next_sec = round_jiffies_up(next);
4198 next_sched = next;
4199
4200 /* If rounded timeout is accurate enough, accept it. */
4201 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
4202 next_sched = next_sec;
4203
4204 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
4205 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
4206 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
4207
ba3542e1 4208 ADBG(KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
4209 now, next, next_sec, next_sched);
c15b1cca 4210 mod_delayed_work(addrconf_wq, &addr_chk_work, next_sched - now);
5c578aed 4211 rcu_read_unlock_bh();
1da177e4
LT		 4212}
4213
c15b1cca
HFS		 4214static void addrconf_verify_work(struct work_struct *w)
4215{
4216 rtnl_lock();
4217 addrconf_verify_rtnl();
4218 rtnl_unlock();
4219}
4220
4221static void addrconf_verify(void)
4222{
4223 mod_delayed_work(addrconf_wq, &addr_chk_work, 0);
4224}
4225
caeaba79
ND		 4226static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local,
4227 struct in6_addr **peer_pfx)
461d8837
TG		 4228{
4229 struct in6_addr *pfx = NULL;
4230
caeaba79
ND		 4231 *peer_pfx = NULL;
4232
461d8837
TG		 4233 if (addr)
4234 pfx = nla_data(addr);
4235
4236 if (local) {
4237 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
caeaba79
ND		 4238 *peer_pfx = pfx;
4239 pfx = nla_data(local);
461d8837
TG		 4240 }
4241
4242 return pfx;
4243}
4244
ef7c79ed 4245static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
461d8837
TG		 4246 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
4247 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
4248 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
479840ff 4249 [IFA_FLAGS] = { .len = sizeof(u32) },
461d8837
TG		 4250};
4251
1da177e4 4252static int
661d2967 4253inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh)
1da177e4 4254{
3b1e0a65 4255 struct net *net = sock_net(skb->sk);
b933f716
TG		 4256 struct ifaddrmsg *ifm;
4257 struct nlattr *tb[IFA_MAX+1];
caeaba79 4258 struct in6_addr *pfx, *peer_pfx;
6046d5b4 4259 u32 ifa_flags;
b933f716 4260 int err;
1da177e4 4261
b933f716
TG		 4262 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
4263 if (err < 0)
4264 return err;
4265
4266 ifm = nlmsg_data(nlh);
caeaba79 4267 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
63159f29 4268 if (!pfx)
1da177e4
LT		 4269 return -EINVAL;
4270
6046d5b4
HK		 4271 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
4272
4273 /* We ignore other flags so far. */
4274 ifa_flags &= IFA_F_MANAGETEMPADDR;
4275
4276 return inet6_addr_del(net, ifm->ifa_index, ifa_flags, pfx,
4277 ifm->ifa_prefixlen);
1da177e4
LT		 4278}
4279
479840ff 4280static int inet6_addr_modify(struct inet6_ifaddr *ifp, u32 ifa_flags,
55ebaef1 4281 u32 prefered_lft, u32 valid_lft)
081bba5b 4282{
6f704992
YH		 4283 u32 flags;
4284 clock_t expires;
4bed72e4 4285 unsigned long timeout;
53bd6749 4286 bool was_managetempaddr;
5b84efec 4287 bool had_prefixroute;
46d48046 4288
c15b1cca
HFS		 4289 ASSERT_RTNL();
4290
081bba5b
NT		 4291 if (!valid_lft || (prefered_lft > valid_lft))
4292 return -EINVAL;
4293
53bd6749
JP		 4294 if (ifa_flags & IFA_F_MANAGETEMPADDR &&
4295 (ifp->flags & IFA_F_TEMPORARY || ifp->prefix_len != 64))
4296 return -EINVAL;
4297
4bed72e4
YH		 4298 timeout = addrconf_timeout_fixup(valid_lft, HZ);
4299 if (addrconf_finite_timeout(timeout)) {
4300 expires = jiffies_to_clock_t(timeout * HZ);
4301 valid_lft = timeout;
6f704992 4302 flags = RTF_EXPIRES;
4bed72e4
YH		 4303 } else {
4304 expires = 0;
4305 flags = 0;
4306 ifa_flags |= IFA_F_PERMANENT;
6f704992 4307 }
081bba5b 4308
4bed72e4
YH		 4309 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
4310 if (addrconf_finite_timeout(timeout)) {
4311 if (timeout == 0)
4312 ifa_flags |= IFA_F_DEPRECATED;
4313 prefered_lft = timeout;
4314 }
081bba5b
NT		 4315
4316 spin_lock_bh(&ifp->lock);
53bd6749 4317 was_managetempaddr = ifp->flags & IFA_F_MANAGETEMPADDR;
5b84efec
TH		 4318 had_prefixroute = ifp->flags & IFA_F_PERMANENT &&
4319 !(ifp->flags & IFA_F_NOPREFIXROUTE);
53bd6749 4320 ifp->flags &= ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD |
761aac73
TH		 4321 IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
4322 IFA_F_NOPREFIXROUTE);
53bd6749 4323 ifp->flags |= ifa_flags;
081bba5b
NT		 4324 ifp->tstamp = jiffies;
4325 ifp->valid_lft = valid_lft;
4326 ifp->prefered_lft = prefered_lft;
4327
4328 spin_unlock_bh(&ifp->lock);
4329 if (!(ifp->flags&IFA_F_TENTATIVE))
4330 ipv6_ifa_notify(0, ifp);
081bba5b 4331
761aac73
TH		 4332 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) {
4333 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
4334 expires, flags);
5b84efec
TH		 4335 } else if (had_prefixroute) {
4336 enum cleanup_prefix_rt_t action;
4337 unsigned long rt_expires;
4338
4339 write_lock_bh(&ifp->idev->lock);
4340 action = check_cleanup_prefix_route(ifp, &rt_expires);
4341 write_unlock_bh(&ifp->idev->lock);
4342
4343 if (action != CLEANUP_PREFIX_RT_NOP) {
4344 cleanup_prefix_route(ifp, rt_expires,
4345 action == CLEANUP_PREFIX_RT_DEL);
4346 }
761aac73 4347 }
53bd6749
JP		 4348
4349 if (was_managetempaddr || ifp->flags & IFA_F_MANAGETEMPADDR) {
4350 if (was_managetempaddr && !(ifp->flags & IFA_F_MANAGETEMPADDR))
4351 valid_lft = prefered_lft = 0;
4352 manage_tempaddrs(ifp->idev, ifp, valid_lft, prefered_lft,
4353 !was_managetempaddr, jiffies);
4354 }
4355
c15b1cca 4356 addrconf_verify_rtnl();
081bba5b
NT		 4357
4358 return 0;
4359}
4360
1da177e4 4361static int
661d2967 4362inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh)
1da177e4 4363{
3b1e0a65 4364 struct net *net = sock_net(skb->sk);
461d8837
TG		 4365 struct ifaddrmsg *ifm;
4366 struct nlattr *tb[IFA_MAX+1];
caeaba79 4367 struct in6_addr *pfx, *peer_pfx;
7198f8ce
TG		 4368 struct inet6_ifaddr *ifa;
4369 struct net_device *dev;
55ebaef1 4370 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
479840ff 4371 u32 ifa_flags;
461d8837 4372 int err;
1da177e4 4373
461d8837
TG		 4374 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
4375 if (err < 0)
4376 return err;
4377
4378 ifm = nlmsg_data(nlh);
caeaba79 4379 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
63159f29 4380 if (!pfx)
1da177e4
LT		 4381 return -EINVAL;
4382
461d8837 4383 if (tb[IFA_CACHEINFO]) {
0778769d 4384 struct ifa_cacheinfo *ci;
461d8837
TG		 4385
4386 ci = nla_data(tb[IFA_CACHEINFO]);
0778769d 4387 valid_lft = ci->ifa_valid;
461d8837
TG		 4388 preferred_lft = ci->ifa_prefered;
4389 } else {
4390 preferred_lft = INFINITY_LIFE_TIME;
4391 valid_lft = INFINITY_LIFE_TIME;
0778769d
NT		 4392 }
4393
af284937 4394 dev = __dev_get_by_index(net, ifm->ifa_index);
63159f29 4395 if (!dev)
7198f8ce
TG		 4396 return -ENODEV;
4397
479840ff
JP		 4398 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
4399
55ebaef1 4400 /* We ignore other flags so far. */
761aac73 4401 ifa_flags &= IFA_F_NODAD | IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
93a714d6 4402 IFA_F_NOPREFIXROUTE | IFA_F_MCAUTOJOIN;
55ebaef1 4403
1cab3da6 4404 ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
63159f29 4405 if (!ifa) {
7198f8ce
TG		 4406 /*
4407 * It would be best to check for !NLM_F_CREATE here but
db9c7c39 4408 * userspace already relies on not having to provide this.
7198f8ce 4409 */
caeaba79 4410 return inet6_addr_add(net, ifm->ifa_index, pfx, peer_pfx,
af284937
DL		 4411 ifm->ifa_prefixlen, ifa_flags,
4412 preferred_lft, valid_lft);
081bba5b
NT		 4413 }
4414
7198f8ce
TG		 4415 if (nlh->nlmsg_flags & NLM_F_EXCL ||
4416 !(nlh->nlmsg_flags & NLM_F_REPLACE))
4417 err = -EEXIST;
4418 else
55ebaef1 4419 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
7198f8ce
TG		 4420
4421 in6_ifa_put(ifa);
4422
4423 return err;
1da177e4
LT		 4424}
4425
479840ff 4426static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u32 flags,
101bb229
TG		 4427 u8 scope, int ifindex)
4428{
4429 struct ifaddrmsg *ifm;
4430
4431 ifm = nlmsg_data(nlh);
4432 ifm->ifa_family = AF_INET6;
4433 ifm->ifa_prefixlen = prefixlen;
4434 ifm->ifa_flags = flags;
4435 ifm->ifa_scope = scope;
4436 ifm->ifa_index = ifindex;
4437}
4438
85486af0
TG		 4439static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
4440 unsigned long tstamp, u32 preferred, u32 valid)
4441{
4442 struct ifa_cacheinfo ci;
4443
18a31e1e
TG		 4444 ci.cstamp = cstamp_delta(cstamp);
4445 ci.tstamp = cstamp_delta(tstamp);
85486af0
TG		 4446 ci.ifa_prefered = preferred;
4447 ci.ifa_valid = valid;
4448
4449 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
4450}
4451
101bb229
TG		 4452static inline int rt_scope(int ifa_scope)
4453{
4454 if (ifa_scope & IFA_HOST)
4455 return RT_SCOPE_HOST;
4456 else if (ifa_scope & IFA_LINK)
4457 return RT_SCOPE_LINK;
4458 else if (ifa_scope & IFA_SITE)
4459 return RT_SCOPE_SITE;
4460 else
4461 return RT_SCOPE_UNIVERSE;
4462}
4463
0ab6803b
TG		 4464static inline int inet6_ifaddr_msgsize(void)
4465{
339bf98f 4466 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
caeaba79 4467 + nla_total_size(16) /* IFA_LOCAL */
339bf98f 4468 + nla_total_size(16) /* IFA_ADDRESS */
479840ff
JP		 4469 + nla_total_size(sizeof(struct ifa_cacheinfo))
4470 + nla_total_size(4) /* IFA_FLAGS */;
0ab6803b 4471}
c5396a31 4472
1da177e4 4473static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
15e47304 4474 u32 portid, u32 seq, int event, unsigned int flags)
1da177e4 4475{
1da177e4 4476 struct nlmsghdr *nlh;
85486af0 4477 u32 preferred, valid;
1da177e4 4478
15e47304 4479 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
63159f29 4480 if (!nlh)
26932566 4481 return -EMSGSIZE;
0ab6803b 4482
101bb229
TG		 4483 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
4484 ifa->idev->dev->ifindex);
4485
fad8da3e
YA		 4486 if (!((ifa->flags&IFA_F_PERMANENT) &&
4487 (ifa->prefered_lft == INFINITY_LIFE_TIME))) {
85486af0
TG		 4488 preferred = ifa->prefered_lft;
4489 valid = ifa->valid_lft;
4490 if (preferred != INFINITY_LIFE_TIME) {
1da177e4 4491 long tval = (jiffies - ifa->tstamp)/HZ;
a1faa698
JR		 4492 if (preferred > tval)
4493 preferred -= tval;
4494 else
4495 preferred = 0;
f56619fc
BH		 4496 if (valid != INFINITY_LIFE_TIME) {
4497 if (valid > tval)
4498 valid -= tval;
4499 else
4500 valid = 0;
4501 }
1da177e4
LT		 4502 }
4503 } else {
85486af0
TG		 4504 preferred = INFINITY_LIFE_TIME;
4505 valid = INFINITY_LIFE_TIME;
4506 }
4507
7996c799 4508 if (!ipv6_addr_any(&ifa->peer_addr)) {
930345ea
JB		 4509 if (nla_put_in6_addr(skb, IFA_LOCAL, &ifa->addr) < 0 ||
4510 nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->peer_addr) < 0)
caeaba79
ND		 4511 goto error;
4512 } else
930345ea 4513 if (nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->addr) < 0)
caeaba79
ND		 4514 goto error;
4515
4516 if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0)
4517 goto error;
1da177e4 4518
479840ff
JP		 4519 if (nla_put_u32(skb, IFA_FLAGS, ifa->flags) < 0)
4520 goto error;
4521
053c095a
JB		 4522 nlmsg_end(skb, nlh);
4523 return 0;
caeaba79
ND		 4524
4525error:
4526 nlmsg_cancel(skb, nlh);
4527 return -EMSGSIZE;
1da177e4
LT		 4528}
4529
4530static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
15e47304 4531 u32 portid, u32 seq, int event, u16 flags)
1da177e4 4532{
1da177e4 4533 struct nlmsghdr *nlh;
101bb229
TG		 4534 u8 scope = RT_SCOPE_UNIVERSE;
4535 int ifindex = ifmca->idev->dev->ifindex;
4536
4537 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
4538 scope = RT_SCOPE_SITE;
1da177e4 4539
15e47304 4540 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
63159f29 4541 if (!nlh)
26932566 4542 return -EMSGSIZE;
85486af0 4543
0ab6803b 4544 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
930345ea 4545 if (nla_put_in6_addr(skb, IFA_MULTICAST, &ifmca->mca_addr) < 0 ||
0ab6803b 4546 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
26932566
PM		 4547 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
4548 nlmsg_cancel(skb, nlh);
4549 return -EMSGSIZE;
4550 }
85486af0 4551
053c095a
JB		 4552 nlmsg_end(skb, nlh);
4553 return 0;
1da177e4
LT		 4554}
4555
4556static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
15e47304 4557 u32 portid, u32 seq, int event, unsigned int flags)
1da177e4 4558{
1da177e4 4559 struct nlmsghdr *nlh;
101bb229
TG		 4560 u8 scope = RT_SCOPE_UNIVERSE;
4561 int ifindex = ifaca->aca_idev->dev->ifindex;
4562
4563 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
4564 scope = RT_SCOPE_SITE;
1da177e4 4565
15e47304 4566 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
63159f29 4567 if (!nlh)
26932566 4568 return -EMSGSIZE;
85486af0 4569
0ab6803b 4570 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
930345ea 4571 if (nla_put_in6_addr(skb, IFA_ANYCAST, &ifaca->aca_addr) < 0 ||
0ab6803b 4572 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
26932566
PM		 4573 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
4574 nlmsg_cancel(skb, nlh);
4575 return -EMSGSIZE;
4576 }
1da177e4 4577
053c095a
JB		 4578 nlmsg_end(skb, nlh);
4579 return 0;
1da177e4
LT		 4580}
4581
e21e8467 4582enum addr_type_t {
1da177e4
LT		 4583 UNICAST_ADDR,
4584 MULTICAST_ADDR,
4585 ANYCAST_ADDR,
4586};
4587
234b27c3
ED		 4588/* called with rcu_read_lock() */
4589static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
4590 struct netlink_callback *cb, enum addr_type_t type,
4591 int s_ip_idx, int *p_ip_idx)
4592{
234b27c3
ED		 4593 struct ifmcaddr6 *ifmca;
4594 struct ifacaddr6 *ifaca;
4595 int err = 1;
4596 int ip_idx = *p_ip_idx;
4597
4598 read_lock_bh(&idev->lock);
4599 switch (type) {
502a2ffd 4600 case UNICAST_ADDR: {
4601 struct inet6_ifaddr *ifa;
4602
234b27c3 4603 /* unicast address incl. temp addr */
502a2ffd 4604 list_for_each_entry(ifa, &idev->addr_list, if_list) {
4605 if (++ip_idx < s_ip_idx)
234b27c3
ED		 4606 continue;
4607 err = inet6_fill_ifaddr(skb, ifa,
15e47304 4608 NETLINK_CB(cb->skb).portid,
234b27c3
ED		 4609 cb->nlh->nlmsg_seq,
4610 RTM_NEWADDR,
4611 NLM_F_MULTI);
053c095a 4612 if (err < 0)
234b27c3 4613 break;
63998ac2 4614 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
234b27c3
ED		 4615 }
4616 break;
502a2ffd 4617 }
234b27c3
ED		 4618 case MULTICAST_ADDR:
4619 /* multicast address */
4620 for (ifmca = idev->mc_list; ifmca;
4621 ifmca = ifmca->next, ip_idx++) {
4622 if (ip_idx < s_ip_idx)
4623 continue;
4624 err = inet6_fill_ifmcaddr(skb, ifmca,
15e47304 4625 NETLINK_CB(cb->skb).portid,
234b27c3
ED		 4626 cb->nlh->nlmsg_seq,
4627 RTM_GETMULTICAST,
4628 NLM_F_MULTI);
053c095a 4629 if (err < 0)
234b27c3
ED		 4630 break;
4631 }
4632 break;
4633 case ANYCAST_ADDR:
4634 /* anycast address */
4635 for (ifaca = idev->ac_list; ifaca;
4636 ifaca = ifaca->aca_next, ip_idx++) {
4637 if (ip_idx < s_ip_idx)
4638 continue;
4639 err = inet6_fill_ifacaddr(skb, ifaca,
15e47304 4640 NETLINK_CB(cb->skb).portid,
234b27c3
ED		 4641 cb->nlh->nlmsg_seq,
4642 RTM_GETANYCAST,
4643 NLM_F_MULTI);
053c095a 4644 if (err < 0)
234b27c3
ED		 4645 break;
4646 }
4647 break;
4648 default:
4649 break;
4650 }
4651 read_unlock_bh(&idev->lock);
4652 *p_ip_idx = ip_idx;
4653 return err;
4654}
4655
1da177e4
LT		 4656static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
4657 enum addr_type_t type)
4658{
234b27c3
ED		 4659 struct net *net = sock_net(skb->sk);
4660 int h, s_h;
1da177e4
LT		 4661 int idx, ip_idx;
4662 int s_idx, s_ip_idx;
1da177e4 4663 struct net_device *dev;
234b27c3
ED		 4664 struct inet6_dev *idev;
4665 struct hlist_head *head;
1ab1457c 4666
234b27c3
ED		 4667 s_h = cb->args[0];
4668 s_idx = idx = cb->args[1];
4669 s_ip_idx = ip_idx = cb->args[2];
5d5619b4 4670
234b27c3 4671 rcu_read_lock();
63998ac2 4672 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ net->dev_base_seq;
234b27c3
ED		 4673 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4674 idx = 0;
4675 head = &net->dev_index_head[h];
b67bfe0d 4676 hlist_for_each_entry_rcu(dev, head, index_hlist) {
234b27c3
ED		 4677 if (idx < s_idx)
4678 goto cont;
4b97efdf 4679 if (h > s_h || idx > s_idx)
234b27c3
ED		 4680 s_ip_idx = 0;
4681 ip_idx = 0;
e21e8467
SH		 4682 idev = __in6_dev_get(dev);
4683 if (!idev)
234b27c3
ED		 4684 goto cont;
4685
4686 if (in6_dump_addrs(idev, skb, cb, type,
7b46a644 4687 s_ip_idx, &ip_idx) < 0)
234b27c3 4688 goto done;
7562f876 4689cont:
234b27c3
ED		 4690 idx++;
4691 }
1da177e4 4692 }
234b27c3
ED		 4693done:
4694 rcu_read_unlock();
4695 cb->args[0] = h;
4696 cb->args[1] = idx;
4697 cb->args[2] = ip_idx;
4698
1da177e4
LT		 4699 return skb->len;
4700}
4701
4702static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
4703{
4704 enum addr_type_t type = UNICAST_ADDR;
b854272b 4705
1da177e4
LT		 4706 return inet6_dump_addr(skb, cb, type);
4707}
4708
4709static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
4710{
4711 enum addr_type_t type = MULTICAST_ADDR;
b854272b 4712
1da177e4
LT		 4713 return inet6_dump_addr(skb, cb, type);
4714}
4715
4716
4717static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
4718{
4719 enum addr_type_t type = ANYCAST_ADDR;
b854272b 4720
1da177e4
LT		 4721 return inet6_dump_addr(skb, cb, type);
4722}
4723
661d2967 4724static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh)
6c223828 4725{
3b1e0a65 4726 struct net *net = sock_net(in_skb->sk);
1b29fc2c
TG		 4727 struct ifaddrmsg *ifm;
4728 struct nlattr *tb[IFA_MAX+1];
caeaba79 4729 struct in6_addr *addr = NULL, *peer;
6c223828
NT		 4730 struct net_device *dev = NULL;
4731 struct inet6_ifaddr *ifa;
4732 struct sk_buff *skb;
6c223828
NT		 4733 int err;
4734
1b29fc2c
TG		 4735 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
4736 if (err < 0)
4737 goto errout;
4738
caeaba79 4739 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer);
63159f29 4740 if (!addr) {
1b29fc2c
TG		 4741 err = -EINVAL;
4742 goto errout;
6c223828 4743 }
6c223828 4744
1b29fc2c 4745 ifm = nlmsg_data(nlh);
6c223828 4746 if (ifm->ifa_index)
6fda7350 4747 dev = __dev_get_by_index(net, ifm->ifa_index);
6c223828 4748
e21e8467
SH		 4749 ifa = ipv6_get_ifaddr(net, addr, dev, 1);
4750 if (!ifa) {
1b29fc2c
TG		 4751 err = -EADDRNOTAVAIL;
4752 goto errout;
4753 }
6c223828 4754
e21e8467
SH		 4755 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
4756 if (!skb) {
6c223828 4757 err = -ENOBUFS;
1b29fc2c 4758 goto errout_ifa;
6c223828
NT		 4759 }
4760
15e47304 4761 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).portid,
6c223828 4762 nlh->nlmsg_seq, RTM_NEWADDR, 0);
26932566
PM		 4763 if (err < 0) {
4764 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4765 WARN_ON(err == -EMSGSIZE);
4766 kfree_skb(skb);
4767 goto errout_ifa;
4768 }
15e47304 4769 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
1b29fc2c 4770errout_ifa:
6c223828 4771 in6_ifa_put(ifa);
1b29fc2c 4772errout:
6c223828 4773 return err;
6c223828
NT		 4774}
4775
1da177e4
LT		 4776static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
4777{
4778 struct sk_buff *skb;
c346dca1 4779 struct net *net = dev_net(ifa->idev->dev);
5d620266 4780 int err = -ENOBUFS;
1da177e4 4781
0ab6803b 4782 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
63159f29 4783 if (!skb)
5d620266
TG		 4784 goto errout;
4785
4786 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
26932566
PM		 4787 if (err < 0) {
4788 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4789 WARN_ON(err == -EMSGSIZE);
4790 kfree_skb(skb);
4791 goto errout;
4792 }
1ce85fe4
PNA		 4793 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
4794 return;
5d620266
TG		 4795errout:
4796 if (err < 0)
6fda7350 4797 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
1da177e4
LT		 4798}
4799
b6f99a21 4800static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
1da177e4
LT		 4801 __s32 *array, int bytes)
4802{
04561c1f
TG		 4803 BUG_ON(bytes < (DEVCONF_MAX * 4));
4804
1da177e4
LT		 4805 memset(array, 0, bytes);
4806 array[DEVCONF_FORWARDING] = cnf->forwarding;
4807 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
4808 array[DEVCONF_MTU6] = cnf->mtu6;
4809 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
4810 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
4811 array[DEVCONF_AUTOCONF] = cnf->autoconf;
4812 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
4813 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
93908d19
TG		 4814 array[DEVCONF_RTR_SOLICIT_INTERVAL] =
4815 jiffies_to_msecs(cnf->rtr_solicit_interval);
4816 array[DEVCONF_RTR_SOLICIT_DELAY] =
4817 jiffies_to_msecs(cnf->rtr_solicit_delay);
1da177e4 4818 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
fc4eba58
HFS		 4819 array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] =
4820 jiffies_to_msecs(cnf->mldv1_unsolicited_report_interval);
4821 array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] =
4822 jiffies_to_msecs(cnf->mldv2_unsolicited_report_interval);
1da177e4
LT		 4823 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
4824 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
4825 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
4826 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
4827 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
1da177e4 4828 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
65f5c7c1 4829 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
8013d1d7 4830 array[DEVCONF_ACCEPT_RA_MIN_HOP_LIMIT] = cnf->accept_ra_min_hop_limit;
c4fd30eb 4831 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
930d6ff2
YH		 4832#ifdef CONFIG_IPV6_ROUTER_PREF
4833 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
93908d19
TG		 4834 array[DEVCONF_RTR_PROBE_INTERVAL] =
4835 jiffies_to_msecs(cnf->rtr_probe_interval);
fa03ef38 4836#ifdef CONFIG_IPV6_ROUTE_INFO
09c884d4
YH		 4837 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
4838#endif
930d6ff2 4839#endif
fbea49e1 4840 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
0bcbc926 4841 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
95c385b4
NH		 4842#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4843 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
7fd2561e 4844 array[DEVCONF_USE_OPTIMISTIC] = cnf->use_optimistic;
95c385b4 4845#endif
7bc570c8
YH		 4846#ifdef CONFIG_IPV6_MROUTE
4847 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
4848#endif
778d80be 4849 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
1b34be74 4850 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
c3faca05 4851 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
5cb04436 4852 array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify;
b800c3b9 4853 array[DEVCONF_SUPPRESS_FRAG_NDISC] = cnf->suppress_frag_ndisc;
d9333196 4854 array[DEVCONF_ACCEPT_RA_FROM_LOCAL] = cnf->accept_ra_from_local;
c2943f14 4855 array[DEVCONF_ACCEPT_RA_MTU] = cnf->accept_ra_mtu;
35103d11 4856 array[DEVCONF_IGNORE_ROUTES_WITH_LINKDOWN] = cnf->ignore_routes_with_linkdown;
3d1bec99 4857 /* we omit DEVCONF_STABLE_SECRET for now */
3985e8a3 4858 array[DEVCONF_USE_OIF_ADDRS_ONLY] = cnf->use_oif_addrs_only;
abbc3043 4859 array[DEVCONF_DROP_UNICAST_IN_L2_MULTICAST] = cnf->drop_unicast_in_l2_multicast;
7a02bf89 4860 array[DEVCONF_DROP_UNSOLICITED_NA] = cnf->drop_unsolicited_na;
f1705ec1 4861 array[DEVCONF_KEEP_ADDR_ON_DOWN] = cnf->keep_addr_on_down;
1da177e4
LT		 4862}
4863
b382b191
TG		 4864static inline size_t inet6_ifla6_size(void)
4865{
4866 return nla_total_size(4) /* IFLA_INET6_FLAGS */
4867 + nla_total_size(sizeof(struct ifla_cacheinfo))
4868 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
4869 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
f53adae4
DB		 4870 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
4871 + nla_total_size(sizeof(struct in6_addr)); /* IFLA_INET6_TOKEN */
b382b191
TG		 4872}
4873
339bf98f
TG		 4874static inline size_t inet6_if_nlmsg_size(void)
4875{
4876 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
4877 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
4878 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
4879 + nla_total_size(4) /* IFLA_MTU */
4880 + nla_total_size(4) /* IFLA_LINK */
0344338b 4881 + nla_total_size(1) /* IFLA_OPERSTATE */
b382b191 4882 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */
339bf98f 4883}
c5396a31 4884
be281e55 4885static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib,
7d720c3e 4886 int items, int bytes)
7f7d9a6b
HX		 4887{
4888 int i;
4889 int pad = bytes - sizeof(u64) * items;
4890 BUG_ON(pad < 0);
4891
4892 /* Use put_unaligned() because stats may not be aligned for u64. */
4893 put_unaligned(items, &stats[0]);
4894 for (i = 1; i < items; i++)
be281e55 4895 put_unaligned(atomic_long_read(&mib[i]), &stats[i]);
7f7d9a6b
HX		 4896
4897 memset(&stats[items], 0, pad);
4898}
4899
698365fa 4900static inline void __snmp6_fill_stats64(u64 *stats, void __percpu *mib,
a3a77372 4901 int bytes, size_t syncpoff)
4ce3c183 4902{
a3a77372
R		 4903 int i, c;
4904 u64 buff[IPSTATS_MIB_MAX];
4905 int pad = bytes - sizeof(u64) * IPSTATS_MIB_MAX;
4906
4ce3c183
ED		 4907 BUG_ON(pad < 0);
4908
a3a77372
R		 4909 memset(buff, 0, sizeof(buff));
4910 buff[0] = IPSTATS_MIB_MAX;
4ce3c183 4911
a3a77372
R		 4912 for_each_possible_cpu(c) {
4913 for (i = 1; i < IPSTATS_MIB_MAX; i++)
4914 buff[i] += snmp_get_cpu_field64(mib, c, i, syncpoff);
4915 }
4916
4917 memcpy(stats, buff, IPSTATS_MIB_MAX * sizeof(u64));
4918 memset(&stats[IPSTATS_MIB_MAX], 0, pad);
4ce3c183
ED		 4919}
4920
7f7d9a6b
HX		 4921static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
4922 int bytes)
4923{
e21e8467 4924 switch (attrtype) {
7f7d9a6b 4925 case IFLA_INET6_STATS:
a3a77372
R		 4926 __snmp6_fill_stats64(stats, idev->stats.ipv6, bytes,
4927 offsetof(struct ipstats_mib, syncp));
7f7d9a6b
HX		 4928 break;
4929 case IFLA_INET6_ICMP6STATS:
be281e55 4930 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, ICMP6_MIB_MAX, bytes);
7f7d9a6b
HX		 4931 break;
4932 }
4933}
4934
d5566fd7
SV		 4935static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev,
4936 u32 ext_filter_mask)
b382b191
TG		 4937{
4938 struct nlattr *nla;
4939 struct ifla_cacheinfo ci;
4940
c78679e8
DM		 4941 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags))
4942 goto nla_put_failure;
b382b191 4943 ci.max_reasm_len = IPV6_MAXPLEN;
24912420
DM		 4944 ci.tstamp = cstamp_delta(idev->tstamp);
4945 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time);
1f9248e5 4946 ci.retrans_time = jiffies_to_msecs(NEIGH_VAR(idev->nd_parms, RETRANS_TIME));
c78679e8
DM		 4947 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci))
4948 goto nla_put_failure;
b382b191 4949 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
63159f29 4950 if (!nla)
b382b191
TG		 4951 goto nla_put_failure;
4952 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
4953
4954 /* XXX - MC not implemented */
4955
d5566fd7
SV		 4956 if (ext_filter_mask & RTEXT_FILTER_SKIP_STATS)
4957 return 0;
4958
b382b191 4959 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
63159f29 4960 if (!nla)
b382b191
TG		 4961 goto nla_put_failure;
4962 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
4963
4964 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
63159f29 4965 if (!nla)
b382b191
TG		 4966 goto nla_put_failure;
4967 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
4968
f53adae4 4969 nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr));
63159f29 4970 if (!nla)
f53adae4 4971 goto nla_put_failure;
bc91b0f0
JP		 4972
4973 if (nla_put_u8(skb, IFLA_INET6_ADDR_GEN_MODE, idev->addr_gen_mode))
4974 goto nla_put_failure;
4975
f53adae4
DB		 4976 read_lock_bh(&idev->lock);
4977 memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla));
4978 read_unlock_bh(&idev->lock);
4979
b382b191
TG		 4980 return 0;
4981
4982nla_put_failure:
4983 return -EMSGSIZE;
4984}
4985
b1974ed0
AR		 4986static size_t inet6_get_link_af_size(const struct net_device *dev,
4987 u32 ext_filter_mask)
b382b191
TG		 4988{
4989 if (!__in6_dev_get(dev))
4990 return 0;
4991
4992 return inet6_ifla6_size();
4993}
4994
d5566fd7
SV		 4995static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev,
4996 u32 ext_filter_mask)
b382b191
TG		 4997{
4998 struct inet6_dev *idev = __in6_dev_get(dev);
4999
5000 if (!idev)
5001 return -ENODATA;
5002
d5566fd7 5003 if (inet6_fill_ifla6_attrs(skb, idev, ext_filter_mask) < 0)
b382b191
TG		 5004 return -EMSGSIZE;
5005
5006 return 0;
5007}
5008
f53adae4
DB		 5009static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token)
5010{
f53adae4
DB		 5011 struct inet6_ifaddr *ifp;
5012 struct net_device *dev = idev->dev;
47e27d5e 5013 bool clear_token, update_rs = false;
dc848292 5014 struct in6_addr ll_addr;
f53adae4 5015
c15b1cca
HFS		 5016 ASSERT_RTNL();
5017
63159f29 5018 if (!token)
f53adae4 5019 return -EINVAL;
f53adae4
DB		 5020 if (dev->flags & (IFF_LOOPBACK | IFF_NOARP))
5021 return -EINVAL;
f53adae4
DB		 5022 if (!ipv6_accept_ra(idev))
5023 return -EINVAL;
5024 if (idev->cnf.rtr_solicits <= 0)
5025 return -EINVAL;
5026
5027 write_lock_bh(&idev->lock);
5028
5029 BUILD_BUG_ON(sizeof(token->s6_addr) != 16);
5030 memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8);
5031
5032 write_unlock_bh(&idev->lock);
5033
47e27d5e
DB		 5034 clear_token = ipv6_addr_any(token);
5035 if (clear_token)
5036 goto update_lft;
5037
dc848292
HFS		 5038 if (!idev->dead && (idev->if_flags & IF_READY) &&
5039 !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE |
5040 IFA_F_OPTIMISTIC)) {
fc403832
DB		 5041 /* If we're not ready, then normal ifup will take care
5042 * of this. Otherwise, we need to request our rs here.
5043 */
5044 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters);
5045 update_rs = true;
5046 }
f53adae4 5047
47e27d5e 5048update_lft:
f53adae4 5049 write_lock_bh(&idev->lock);
fc403832 5050
77ecaace 5051 if (update_rs) {
fc403832 5052 idev->if_flags |= IF_RS_SENT;
77ecaace
HFS		 5053 idev->rs_probes = 1;
5054 addrconf_mod_rs_timer(idev, idev->cnf.rtr_solicit_interval);
5055 }
f53adae4
DB		 5056
5057 /* Well, that's kinda nasty ... */
5058 list_for_each_entry(ifp, &idev->addr_list, if_list) {
5059 spin_lock(&ifp->lock);
617fe29d 5060 if (ifp->tokenized) {
f53adae4
DB		 5061 ifp->valid_lft = 0;
5062 ifp->prefered_lft = 0;
5063 }
5064 spin_unlock(&ifp->lock);
5065 }
5066
5067 write_unlock_bh(&idev->lock);
b2ed64a9 5068 inet6_ifinfo_notify(RTM_NEWLINK, idev);
c15b1cca 5069 addrconf_verify_rtnl();
f53adae4
DB		 5070 return 0;
5071}
5072
11b1f828
DB		 5073static const struct nla_policy inet6_af_policy[IFLA_INET6_MAX + 1] = {
5074 [IFLA_INET6_ADDR_GEN_MODE] = { .type = NLA_U8 },
5075 [IFLA_INET6_TOKEN] = { .len = sizeof(struct in6_addr) },
5076};
5077
5078static int inet6_validate_link_af(const struct net_device *dev,
5079 const struct nlattr *nla)
5080{
5081 struct nlattr *tb[IFLA_INET6_MAX + 1];
5082
5083 if (dev && !__in6_dev_get(dev))
5084 return -EAFNOSUPPORT;
5085
5086 return nla_parse_nested(tb, IFLA_INET6_MAX, nla, inet6_af_policy);
5087}
5088
f53adae4
DB		 5089static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla)
5090{
5091 int err = -EINVAL;
5092 struct inet6_dev *idev = __in6_dev_get(dev);
5093 struct nlattr *tb[IFLA_INET6_MAX + 1];
5094
5095 if (!idev)
5096 return -EAFNOSUPPORT;
5097
5098 if (nla_parse_nested(tb, IFLA_INET6_MAX, nla, NULL) < 0)
5099 BUG();
5100
bc91b0f0 5101 if (tb[IFLA_INET6_TOKEN]) {
f53adae4 5102 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN]));
bc91b0f0
JP		 5103 if (err)
5104 return err;
5105 }
5106
5107 if (tb[IFLA_INET6_ADDR_GEN_MODE]) {
5108 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]);
5109
5110 if (mode != IN6_ADDR_GEN_MODE_EUI64 &&
622c81d5 5111 mode != IN6_ADDR_GEN_MODE_NONE &&
cc9da6cc
BM		 5112 mode != IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
5113 mode != IN6_ADDR_GEN_MODE_RANDOM)
622c81d5
HFS		 5114 return -EINVAL;
5115
5116 if (mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
5117 !idev->cnf.stable_secret.initialized &&
5118 !dev_net(dev)->ipv6.devconf_dflt->stable_secret.initialized)
bc91b0f0 5119 return -EINVAL;
622c81d5 5120
bc91b0f0
JP		 5121 idev->addr_gen_mode = mode;
5122 err = 0;
5123 }
f53adae4
DB		 5124
5125 return err;
5126}
5127
1ab1457c 5128static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
15e47304 5129 u32 portid, u32 seq, int event, unsigned int flags)
1da177e4 5130{
04561c1f 5131 struct net_device *dev = idev->dev;
04561c1f
TG		 5132 struct ifinfomsg *hdr;
5133 struct nlmsghdr *nlh;
5134 void *protoinfo;
04561c1f 5135
15e47304 5136 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags);
63159f29 5137 if (!nlh)
26932566 5138 return -EMSGSIZE;
04561c1f
TG		 5139
5140 hdr = nlmsg_data(nlh);
5141 hdr->ifi_family = AF_INET6;
5142 hdr->__ifi_pad = 0;
5143 hdr->ifi_type = dev->type;
5144 hdr->ifi_index = dev->ifindex;
5145 hdr->ifi_flags = dev_get_flags(dev);
5146 hdr->ifi_change = 0;
5147
c78679e8
DM		 5148 if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
5149 (dev->addr_len &&
5150 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
5151 nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
a54acb3a 5152 (dev->ifindex != dev_get_iflink(dev) &&
0344338b
AG		 5153 nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))) ||
5154 nla_put_u8(skb, IFLA_OPERSTATE,
5155 netif_running(dev) ? dev->operstate : IF_OPER_DOWN))
c78679e8 5156 goto nla_put_failure;
04561c1f 5157 protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
63159f29 5158 if (!protoinfo)
04561c1f 5159 goto nla_put_failure;
1da177e4 5160
d5566fd7 5161 if (inet6_fill_ifla6_attrs(skb, idev, 0) < 0)
bf99f1bd 5162 goto nla_put_failure;
1da177e4 5163
04561c1f 5164 nla_nest_end(skb, protoinfo);
053c095a
JB		 5165 nlmsg_end(skb, nlh);
5166 return 0;
1da177e4 5167
04561c1f 5168nla_put_failure:
26932566
PM		 5169 nlmsg_cancel(skb, nlh);
5170 return -EMSGSIZE;
1da177e4
LT		 5171}
5172
5173static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
5174{
3b1e0a65 5175 struct net *net = sock_net(skb->sk);
84d2697d 5176 int h, s_h;
434a8a58 5177 int idx = 0, s_idx;
1da177e4
LT		 5178 struct net_device *dev;
5179 struct inet6_dev *idev;
84d2697d 5180 struct hlist_head *head;
1da177e4 5181
84d2697d
ED		 5182 s_h = cb->args[0];
5183 s_idx = cb->args[1];
5184
5185 rcu_read_lock();
5186 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
5187 idx = 0;
5188 head = &net->dev_index_head[h];
b67bfe0d 5189 hlist_for_each_entry_rcu(dev, head, index_hlist) {
84d2697d
ED		 5190 if (idx < s_idx)
5191 goto cont;
5192 idev = __in6_dev_get(dev);
5193 if (!idev)
5194 goto cont;
5195 if (inet6_fill_ifinfo(skb, idev,
15e47304 5196 NETLINK_CB(cb->skb).portid,
84d2697d 5197 cb->nlh->nlmsg_seq,
053c095a 5198 RTM_NEWLINK, NLM_F_MULTI) < 0)
84d2697d 5199 goto out;
7562f876 5200cont:
84d2697d
ED		 5201 idx++;
5202 }
1da177e4 5203 }
84d2697d
ED		 5204out:
5205 rcu_read_unlock();
5206 cb->args[1] = idx;
5207 cb->args[0] = h;
1da177e4
LT		 5208
5209 return skb->len;
5210}
5211
5212void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
5213{
5214 struct sk_buff *skb;
c346dca1 5215 struct net *net = dev_net(idev->dev);
8d7a76c9 5216 int err = -ENOBUFS;
1ab1457c 5217
339bf98f 5218 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
63159f29 5219 if (!skb)
8d7a76c9
TG		 5220 goto errout;
5221
5222 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
26932566
PM		 5223 if (err < 0) {
5224 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
5225 WARN_ON(err == -EMSGSIZE);
5226 kfree_skb(skb);
5227 goto errout;
5228 }
5f75a104 5229 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC);
1ce85fe4 5230 return;
8d7a76c9
TG		 5231errout:
5232 if (err < 0)
5f75a104 5233 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err);
1da177e4
LT		 5234}
5235
339bf98f
TG		 5236static inline size_t inet6_prefix_nlmsg_size(void)
5237{
5238 return NLMSG_ALIGN(sizeof(struct prefixmsg))
5239 + nla_total_size(sizeof(struct in6_addr))
5240 + nla_total_size(sizeof(struct prefix_cacheinfo));
5241}
c5396a31 5242
1da177e4 5243static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
15e47304 5244 struct prefix_info *pinfo, u32 portid, u32 seq,
6051e2f4 5245 int event, unsigned int flags)
1da177e4 5246{
6051e2f4
TG		 5247 struct prefixmsg *pmsg;
5248 struct nlmsghdr *nlh;
1da177e4
LT		 5249 struct prefix_cacheinfo ci;
5250
15e47304 5251 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags);
63159f29 5252 if (!nlh)
26932566 5253 return -EMSGSIZE;
6051e2f4
TG		 5254
5255 pmsg = nlmsg_data(nlh);
1da177e4 5256 pmsg->prefix_family = AF_INET6;
8a47077a
PM		 5257 pmsg->prefix_pad1 = 0;
5258 pmsg->prefix_pad2 = 0;
1da177e4
LT		 5259 pmsg->prefix_ifindex = idev->dev->ifindex;
5260 pmsg->prefix_len = pinfo->prefix_len;
5261 pmsg->prefix_type = pinfo->type;
8a47077a 5262 pmsg->prefix_pad3 = 0;
1da177e4
LT		 5263 pmsg->prefix_flags = 0;
5264 if (pinfo->onlink)
5265 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
5266 if (pinfo->autoconf)
5267 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
5268
c78679e8
DM		 5269 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix))
5270 goto nla_put_failure;
1da177e4
LT		 5271 ci.preferred_time = ntohl(pinfo->prefered);
5272 ci.valid_time = ntohl(pinfo->valid);
c78679e8
DM		 5273 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci))
5274 goto nla_put_failure;
053c095a
JB		 5275 nlmsg_end(skb, nlh);
5276 return 0;
1da177e4 5277
6051e2f4 5278nla_put_failure:
26932566
PM		 5279 nlmsg_cancel(skb, nlh);
5280 return -EMSGSIZE;
1da177e4
LT		 5281}
5282
1ab1457c 5283static void inet6_prefix_notify(int event, struct inet6_dev *idev,
1da177e4
LT		 5284 struct prefix_info *pinfo)
5285{
5286 struct sk_buff *skb;
c346dca1 5287 struct net *net = dev_net(idev->dev);
8c384bfa 5288 int err = -ENOBUFS;
1da177e4 5289
339bf98f 5290 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
63159f29 5291 if (!skb)
8c384bfa
TG		 5292 goto errout;
5293
5294 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
26932566
PM		 5295 if (err < 0) {
5296 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
5297 WARN_ON(err == -EMSGSIZE);
5298 kfree_skb(skb);
5299 goto errout;
5300 }
1ce85fe4
PNA		 5301 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
5302 return;
8c384bfa
TG		 5303errout:
5304 if (err < 0)
6fda7350 5305 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
1da177e4
LT		 5306}
5307
1da177e4
LT		 5308static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
5309{
63998ac2
ND		 5310 struct net *net = dev_net(ifp->idev->dev);
5311
c15b1cca
HFS		 5312 if (event)
5313 ASSERT_RTNL();
5314
1da177e4
LT		 5315 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
5316
5317 switch (event) {
5318 case RTM_NEWADDR:
95c385b4
NH		 5319 /*
5320 * If the address was optimistic
5321 * we inserted the route at the start of
5322 * our DAD process, so we don't need
5323 * to do it again
5324 */
5325 if (!(ifp->rt->rt6i_node))
5326 ip6_ins_rt(ifp->rt);
1da177e4
LT		 5327 if (ifp->idev->cnf.forwarding)
5328 addrconf_join_anycast(ifp);
7996c799 5329 if (!ipv6_addr_any(&ifp->peer_addr))
caeaba79
ND		 5330 addrconf_prefix_route(&ifp->peer_addr, 128,
5331 ifp->idev->dev, 0, 0);
1da177e4
LT		 5332 break;
5333 case RTM_DELADDR:
5334 if (ifp->idev->cnf.forwarding)
5335 addrconf_leave_anycast(ifp);
5336 addrconf_leave_solict(ifp->idev, &ifp->addr);
7996c799 5337 if (!ipv6_addr_any(&ifp->peer_addr)) {
caeaba79 5338 struct rt6_info *rt;
caeaba79 5339
e7478dfc
ND		 5340 rt = addrconf_get_prefix_route(&ifp->peer_addr, 128,
5341 ifp->idev->dev, 0, 0);
8e3d5be7
MKL		 5342 if (rt)
5343 ip6_del_rt(rt);
caeaba79 5344 }
38bd10c4
DA		 5345 if (ifp->rt) {
5346 dst_hold(&ifp->rt->dst);
5347 ip6_del_rt(ifp->rt);
5348 }
705f1c86 5349 rt_genid_bump_ipv6(net);
1da177e4
LT		 5350 break;
5351 }
63998ac2 5352 atomic_inc(&net->ipv6.dev_addr_genid);
1da177e4
LT		 5353}
5354
5355static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
5356{
8814c4b5 5357 rcu_read_lock_bh();
1da177e4
LT		 5358 if (likely(ifp->idev->dead == 0))
5359 __ipv6_ifa_notify(event, ifp);
8814c4b5 5360 rcu_read_unlock_bh();
1da177e4
LT		 5361}
5362
5363#ifdef CONFIG_SYSCTL
5364
5365static
fe2c6338 5366int addrconf_sysctl_forward(struct ctl_table *ctl, int write,
1da177e4
LT		 5367 void __user *buffer, size_t *lenp, loff_t *ppos)
5368{
5369 int *valp = ctl->data;
5370 int val = *valp;
88af182e 5371 loff_t pos = *ppos;
fe2c6338 5372 struct ctl_table lctl;
1da177e4
LT		 5373 int ret;
5374
013d97e9
FR		 5375 /*
5376 * ctl->data points to idev->cnf.forwarding, we should
5377 * not modify it until we get the rtnl lock.
5378 */
5379 lctl = *ctl;
5380 lctl.data = &val;
5381
5382 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
1da177e4 5383
c8fecf22 5384 if (write)
b325fddb 5385 ret = addrconf_fixup_forwarding(ctl, valp, val);
88af182e
EB		 5386 if (ret)
5387 *ppos = pos;
1ab1457c 5388 return ret;
1da177e4
LT		 5389}
5390
d6df198d
PS		 5391static
5392int addrconf_sysctl_hop_limit(struct ctl_table *ctl, int write,
5393 void __user *buffer, size_t *lenp, loff_t *ppos)
5394{
5395 struct ctl_table lctl;
5396 int min_hl = 1, max_hl = 255;
5397
5398 lctl = *ctl;
5399 lctl.extra1 = &min_hl;
5400 lctl.extra2 = &max_hl;
5401
5402 return proc_dointvec_minmax(&lctl, write, buffer, lenp, ppos);
5403}
5404
77751427
ML		 5405static
5406int addrconf_sysctl_mtu(struct ctl_table *ctl, int write,
5407 void __user *buffer, size_t *lenp, loff_t *ppos)
5408{
5409 struct inet6_dev *idev = ctl->extra1;
5410 int min_mtu = IPV6_MIN_MTU;
5411 struct ctl_table lctl;
5412
5413 lctl = *ctl;
5414 lctl.extra1 = &min_mtu;
5415 lctl.extra2 = idev ? &idev->dev->mtu : NULL;
5416
5417 return proc_dointvec_minmax(&lctl, write, buffer, lenp, ppos);
5418}
5419
56d417b1
BH		 5420static void dev_disable_change(struct inet6_dev *idev)
5421{
75538c2b
CW		 5422 struct netdev_notifier_info info;
5423
56d417b1
BH		 5424 if (!idev || !idev->dev)
5425 return;
5426
75538c2b 5427 netdev_notifier_info_init(&info, idev->dev);
56d417b1 5428 if (idev->cnf.disable_ipv6)
75538c2b 5429 addrconf_notify(NULL, NETDEV_DOWN, &info);
56d417b1 5430 else
75538c2b 5431 addrconf_notify(NULL, NETDEV_UP, &info);
56d417b1
BH		 5432}
5433
5434static void addrconf_disable_change(struct net *net, __s32 newf)
5435{
5436 struct net_device *dev;
5437 struct inet6_dev *idev;
5438
c6d14c84
ED		 5439 rcu_read_lock();
5440 for_each_netdev_rcu(net, dev) {
56d417b1
BH		 5441 idev = __in6_dev_get(dev);
5442 if (idev) {
5443 int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
5444 idev->cnf.disable_ipv6 = newf;
5445 if (changed)
5446 dev_disable_change(idev);
5447 }
56d417b1 5448 }
c6d14c84 5449 rcu_read_unlock();
56d417b1
BH		 5450}
5451
013d97e9 5452static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf)
56d417b1
BH		 5453{
5454 struct net *net;
013d97e9
FR		 5455 int old;
5456
5457 if (!rtnl_trylock())
5458 return restart_syscall();
56d417b1
BH		 5459
5460 net = (struct net *)table->extra2;
013d97e9
FR		 5461 old = *p;
5462 *p = newf;
56d417b1 5463
013d97e9
FR		 5464 if (p == &net->ipv6.devconf_dflt->disable_ipv6) {
5465 rtnl_unlock();
56d417b1 5466 return 0;
88af182e 5467 }
56d417b1
BH		 5468
5469 if (p == &net->ipv6.devconf_all->disable_ipv6) {
56d417b1
BH		 5470 net->ipv6.devconf_dflt->disable_ipv6 = newf;
5471 addrconf_disable_change(net, newf);
013d97e9 5472 } else if ((!newf) ^ (!old))
56d417b1
BH		 5473 dev_disable_change((struct inet6_dev *)table->extra1);
5474
5475 rtnl_unlock();
5476 return 0;
5477}
5478
5479static
fe2c6338 5480int addrconf_sysctl_disable(struct ctl_table *ctl, int write,
56d417b1
BH		 5481 void __user *buffer, size_t *lenp, loff_t *ppos)
5482{
5483 int *valp = ctl->data;
5484 int val = *valp;
88af182e 5485 loff_t pos = *ppos;
fe2c6338 5486 struct ctl_table lctl;
56d417b1
BH		 5487 int ret;
5488
013d97e9
FR		 5489 /*
5490 * ctl->data points to idev->cnf.disable_ipv6, we should
5491 * not modify it until we get the rtnl lock.
5492 */
5493 lctl = *ctl;
5494 lctl.data = &val;
5495
5496 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
56d417b1
BH		 5497
5498 if (write)
5499 ret = addrconf_disable_ipv6(ctl, valp, val);
88af182e
EB		 5500 if (ret)
5501 *ppos = pos;
56d417b1
BH		 5502 return ret;
5503}
5504
c92d5491 5505static
5506int addrconf_sysctl_proxy_ndp(struct ctl_table *ctl, int write,
5507 void __user *buffer, size_t *lenp, loff_t *ppos)
5508{
5509 int *valp = ctl->data;
5510 int ret;
5511 int old, new;
5512
5513 old = *valp;
5514 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
5515 new = *valp;
5516
5517 if (write && old != new) {
5518 struct net *net = ctl->extra2;
5519
5520 if (!rtnl_trylock())
5521 return restart_syscall();
5522
5523 if (valp == &net->ipv6.devconf_dflt->proxy_ndp)
5524 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
5525 NETCONFA_IFINDEX_DEFAULT,
5526 net->ipv6.devconf_dflt);
5527 else if (valp == &net->ipv6.devconf_all->proxy_ndp)
5528 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
5529 NETCONFA_IFINDEX_ALL,
5530 net->ipv6.devconf_all);
5531 else {
5532 struct inet6_dev *idev = ctl->extra1;
5533
5534 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
5535 idev->dev->ifindex,
5536 &idev->cnf);
5537 }
5538 rtnl_unlock();
5539 }
5540
5541 return ret;
5542}
5543
3d1bec99
HFS		 5544static int addrconf_sysctl_stable_secret(struct ctl_table *ctl, int write,
5545 void __user *buffer, size_t *lenp,
5546 loff_t *ppos)
5547{
5548 int err;
5549 struct in6_addr addr;
5550 char str[IPV6_MAX_STRLEN];
5551 struct ctl_table lctl = *ctl;
622c81d5 5552 struct net *net = ctl->extra2;
3d1bec99
HFS		 5553 struct ipv6_stable_secret *secret = ctl->data;
5554
622c81d5
HFS		 5555 if (&net->ipv6.devconf_all->stable_secret == ctl->data)
5556 return -EIO;
5557
3d1bec99
HFS		 5558 lctl.maxlen = IPV6_MAX_STRLEN;
5559 lctl.data = str;
5560
5561 if (!rtnl_trylock())
5562 return restart_syscall();
5563
5564 if (!write && !secret->initialized) {
5565 err = -EIO;
5566 goto out;
5567 }
5568
5449a5ca
WC		 5569 err = snprintf(str, sizeof(str), "%pI6", &secret->secret);
5570 if (err >= sizeof(str)) {
5571 err = -EIO;
5572 goto out;
3d1bec99
HFS		 5573 }
5574
5575 err = proc_dostring(&lctl, write, buffer, lenp, ppos);
5576 if (err || !write)
5577 goto out;
5578
5579 if (in6_pton(str, -1, addr.in6_u.u6_addr8, -1, NULL) != 1) {
5580 err = -EIO;
5581 goto out;
5582 }
5583
5584 secret->initialized = true;
5585 secret->secret = addr;
5586
622c81d5
HFS		 5587 if (&net->ipv6.devconf_dflt->stable_secret == ctl->data) {
5588 struct net_device *dev;
5589
5590 for_each_netdev(net, dev) {
5591 struct inet6_dev *idev = __in6_dev_get(dev);
5592
5593 if (idev) {
5594 idev->addr_gen_mode =
5595 IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
5596 }
5597 }
5598 } else {
5599 struct inet6_dev *idev = ctl->extra1;
5600
5601 idev->addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
5602 }
5603
3d1bec99
HFS		 5604out:
5605 rtnl_unlock();
5606
5607 return err;
5608}
c92d5491 5609
35103d11
AG		 5610static
5611int addrconf_sysctl_ignore_routes_with_linkdown(struct ctl_table *ctl,
5612 int write,
5613 void __user *buffer,
5614 size_t *lenp,
5615 loff_t *ppos)
5616{
5617 int *valp = ctl->data;
5618 int val = *valp;
5619 loff_t pos = *ppos;
5620 struct ctl_table lctl;
5621 int ret;
5622
5623 /* ctl->data points to idev->cnf.ignore_routes_when_linkdown
5624 * we should not modify it until we get the rtnl lock.
5625 */
5626 lctl = *ctl;
5627 lctl.data = &val;
5628
5629 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
5630
5631 if (write)
5632 ret = addrconf_fixup_linkdown(ctl, valp, val);
5633 if (ret)
5634 *ppos = pos;
5635 return ret;
5636}
5637
607ea7cd 5638static const struct ctl_table addrconf_sysctl[] = {
5df1f77f
KK		 5639 {
5640 .procname = "forwarding",
5641 .data = &ipv6_devconf.forwarding,
5642 .maxlen = sizeof(int),
5643 .mode = 0644,
5644 .proc_handler = addrconf_sysctl_forward,
5645 },
5646 {
5647 .procname = "hop_limit",
5648 .data = &ipv6_devconf.hop_limit,
5649 .maxlen = sizeof(int),
5650 .mode = 0644,
5651 .proc_handler = addrconf_sysctl_hop_limit,
5652 },
5653 {
5654 .procname = "mtu",
5655 .data = &ipv6_devconf.mtu6,
5656 .maxlen = sizeof(int),
5657 .mode = 0644,
5658 .proc_handler = addrconf_sysctl_mtu,
5659 },
5660 {
5661 .procname = "accept_ra",
5662 .data = &ipv6_devconf.accept_ra,
5663 .maxlen = sizeof(int),
5664 .mode = 0644,
5665 .proc_handler = proc_dointvec,
5666 },
5667 {
5668 .procname = "accept_redirects",
5669 .data = &ipv6_devconf.accept_redirects,
5670 .maxlen = sizeof(int),
5671 .mode = 0644,
5672 .proc_handler = proc_dointvec,
5673 },
5674 {
5675 .procname = "autoconf",
5676 .data = &ipv6_devconf.autoconf,
5677 .maxlen = sizeof(int),
5678 .mode = 0644,
5679 .proc_handler = proc_dointvec,
5680 },
5681 {
5682 .procname = "dad_transmits",
5683 .data = &ipv6_devconf.dad_transmits,
5684 .maxlen = sizeof(int),
5685 .mode = 0644,
5686 .proc_handler = proc_dointvec,
5687 },
5688 {
5689 .procname = "router_solicitations",
5690 .data = &ipv6_devconf.rtr_solicits,
5691 .maxlen = sizeof(int),
5692 .mode = 0644,
5693 .proc_handler = proc_dointvec,
5694 },
5695 {
5696 .procname = "router_solicitation_interval",
5697 .data = &ipv6_devconf.rtr_solicit_interval,
5698 .maxlen = sizeof(int),
5699 .mode = 0644,
5700 .proc_handler = proc_dointvec_jiffies,
5701 },
5702 {
5703 .procname = "router_solicitation_delay",
5704 .data = &ipv6_devconf.rtr_solicit_delay,
5705 .maxlen = sizeof(int),
5706 .mode = 0644,
5707 .proc_handler = proc_dointvec_jiffies,
5708 },
5709 {
5710 .procname = "force_mld_version",
5711 .data = &ipv6_devconf.force_mld_version,
5712 .maxlen = sizeof(int),
5713 .mode = 0644,
5714 .proc_handler = proc_dointvec,
5715 },
5716 {
5717 .procname = "mldv1_unsolicited_report_interval",
5718 .data =
5719 &ipv6_devconf.mldv1_unsolicited_report_interval,
5720 .maxlen = sizeof(int),
5721 .mode = 0644,
5722 .proc_handler = proc_dointvec_ms_jiffies,
5723 },
5724 {
5725 .procname = "mldv2_unsolicited_report_interval",
5726 .data =
5727 &ipv6_devconf.mldv2_unsolicited_report_interval,
5728 .maxlen = sizeof(int),
5729 .mode = 0644,
5730 .proc_handler = proc_dointvec_ms_jiffies,
5731 },
5732 {
5733 .procname = "use_tempaddr",
5734 .data = &ipv6_devconf.use_tempaddr,
5735 .maxlen = sizeof(int),
5736 .mode = 0644,
5737 .proc_handler = proc_dointvec,
5738 },
5739 {
5740 .procname = "temp_valid_lft",
5741 .data = &ipv6_devconf.temp_valid_lft,
5742 .maxlen = sizeof(int),
5743 .mode = 0644,
5744 .proc_handler = proc_dointvec,
5745 },
5746 {
5747 .procname = "temp_prefered_lft",
5748 .data = &ipv6_devconf.temp_prefered_lft,
5749 .maxlen = sizeof(int),
5750 .mode = 0644,
5751 .proc_handler = proc_dointvec,
5752 },
5753 {
5754 .procname = "regen_max_retry",
5755 .data = &ipv6_devconf.regen_max_retry,
5756 .maxlen = sizeof(int),
5757 .mode = 0644,
5758 .proc_handler = proc_dointvec,
5759 },
5760 {
5761 .procname = "max_desync_factor",
5762 .data = &ipv6_devconf.max_desync_factor,
5763 .maxlen = sizeof(int),
5764 .mode = 0644,
5765 .proc_handler = proc_dointvec,
5766 },
5767 {
5768 .procname = "max_addresses",
5769 .data = &ipv6_devconf.max_addresses,
5770 .maxlen = sizeof(int),
5771 .mode = 0644,
5772 .proc_handler = proc_dointvec,
5773 },
5774 {
5775 .procname = "accept_ra_defrtr",
5776 .data = &ipv6_devconf.accept_ra_defrtr,
5777 .maxlen = sizeof(int),
5778 .mode = 0644,
5779 .proc_handler = proc_dointvec,
5780 },
5781 {
5782 .procname = "accept_ra_min_hop_limit",
5783 .data = &ipv6_devconf.accept_ra_min_hop_limit,
5784 .maxlen = sizeof(int),
5785 .mode = 0644,
5786 .proc_handler = proc_dointvec,
5787 },
5788 {
5789 .procname = "accept_ra_pinfo",
5790 .data = &ipv6_devconf.accept_ra_pinfo,
5791 .maxlen = sizeof(int),
5792 .mode = 0644,
5793 .proc_handler = proc_dointvec,
5794 },
930d6ff2 5795#ifdef CONFIG_IPV6_ROUTER_PREF
5df1f77f
KK		 5796 {
5797 .procname = "accept_ra_rtr_pref",
5798 .data = &ipv6_devconf.accept_ra_rtr_pref,
5799 .maxlen = sizeof(int),
5800 .mode = 0644,
5801 .proc_handler = proc_dointvec,
5802 },
5803 {
5804 .procname = "router_probe_interval",
5805 .data = &ipv6_devconf.rtr_probe_interval,
5806 .maxlen = sizeof(int),
5807 .mode = 0644,
5808 .proc_handler = proc_dointvec_jiffies,
5809 },
fa03ef38 5810#ifdef CONFIG_IPV6_ROUTE_INFO
5df1f77f
KK		 5811 {
5812 .procname = "accept_ra_rt_info_max_plen",
5813 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
5814 .maxlen = sizeof(int),
5815 .mode = 0644,
5816 .proc_handler = proc_dointvec,
5817 },
09c884d4 5818#endif
930d6ff2 5819#endif
5df1f77f
KK		 5820 {
5821 .procname = "proxy_ndp",
5822 .data = &ipv6_devconf.proxy_ndp,
5823 .maxlen = sizeof(int),
5824 .mode = 0644,
5825 .proc_handler = addrconf_sysctl_proxy_ndp,
5826 },
5827 {
5828 .procname = "accept_source_route",
5829 .data = &ipv6_devconf.accept_source_route,
5830 .maxlen = sizeof(int),
5831 .mode = 0644,
5832 .proc_handler = proc_dointvec,
5833 },
95c385b4 5834#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
5df1f77f
KK		 5835 {
5836 .procname = "optimistic_dad",
5837 .data = &ipv6_devconf.optimistic_dad,
5838 .maxlen = sizeof(int),
5839 .mode = 0644,
5840 .proc_handler = proc_dointvec,
5841 },
5842 {
5843 .procname = "use_optimistic",
5844 .data = &ipv6_devconf.use_optimistic,
5845 .maxlen = sizeof(int),
5846 .mode = 0644,
5847 .proc_handler = proc_dointvec,
5848 },
7bc570c8
YH		 5849#endif
5850#ifdef CONFIG_IPV6_MROUTE
5df1f77f
KK		 5851 {
5852 .procname = "mc_forwarding",
5853 .data = &ipv6_devconf.mc_forwarding,
5854 .maxlen = sizeof(int),
5855 .mode = 0444,
5856 .proc_handler = proc_dointvec,
5857 },
95c385b4 5858#endif
5df1f77f
KK		 5859 {
5860 .procname = "disable_ipv6",
5861 .data = &ipv6_devconf.disable_ipv6,
5862 .maxlen = sizeof(int),
5863 .mode = 0644,
5864 .proc_handler = addrconf_sysctl_disable,
5865 },
5866 {
5867 .procname = "accept_dad",
5868 .data = &ipv6_devconf.accept_dad,
5869 .maxlen = sizeof(int),
5870 .mode = 0644,
5871 .proc_handler = proc_dointvec,
5872 },
5873 {
5874 .procname = "force_tllao",
5875 .data = &ipv6_devconf.force_tllao,
5876 .maxlen = sizeof(int),
5877 .mode = 0644,
5878 .proc_handler = proc_dointvec
5879 },
5880 {
5881 .procname = "ndisc_notify",
5882 .data = &ipv6_devconf.ndisc_notify,
5883 .maxlen = sizeof(int),
5884 .mode = 0644,
5885 .proc_handler = proc_dointvec
5886 },
5887 {
5888 .procname = "suppress_frag_ndisc",
5889 .data = &ipv6_devconf.suppress_frag_ndisc,
5890 .maxlen = sizeof(int),
5891 .mode = 0644,
5892 .proc_handler = proc_dointvec
5893 },
5894 {
5895 .procname = "accept_ra_from_local",
5896 .data = &ipv6_devconf.accept_ra_from_local,
5897 .maxlen = sizeof(int),
5898 .mode = 0644,
5899 .proc_handler = proc_dointvec,
5900 },
5901 {
5902 .procname = "accept_ra_mtu",
5903 .data = &ipv6_devconf.accept_ra_mtu,
5904 .maxlen = sizeof(int),
5905 .mode = 0644,
5906 .proc_handler = proc_dointvec,
5907 },
5908 {
5909 .procname = "stable_secret",
5910 .data = &ipv6_devconf.stable_secret,
5911 .maxlen = IPV6_MAX_STRLEN,
5912 .mode = 0600,
5913 .proc_handler = addrconf_sysctl_stable_secret,
5914 },
5915 {
5916 .procname = "use_oif_addrs_only",
5917 .data = &ipv6_devconf.use_oif_addrs_only,
5918 .maxlen = sizeof(int),
5919 .mode = 0644,
5920 .proc_handler = proc_dointvec,
5921 },
5922 {
5923 .procname = "ignore_routes_with_linkdown",
5924 .data = &ipv6_devconf.ignore_routes_with_linkdown,
5925 .maxlen = sizeof(int),
5926 .mode = 0644,
5927 .proc_handler = addrconf_sysctl_ignore_routes_with_linkdown,
5928 },
5929 {
5930 .procname = "drop_unicast_in_l2_multicast",
5931 .data = &ipv6_devconf.drop_unicast_in_l2_multicast,
5932 .maxlen = sizeof(int),
5933 .mode = 0644,
5934 .proc_handler = proc_dointvec,
5935 },
5936 {
5937 .procname = "drop_unsolicited_na",
5938 .data = &ipv6_devconf.drop_unsolicited_na,
5939 .maxlen = sizeof(int),
5940 .mode = 0644,
5941 .proc_handler = proc_dointvec,
5942 },
5943 {
5944 .procname = "keep_addr_on_down",
5945 .data = &ipv6_devconf.keep_addr_on_down,
5946 .maxlen = sizeof(int),
5947 .mode = 0644,
5948 .proc_handler = proc_dointvec,
5949
5950 },
5951 {
5952 /* sentinel */
5953 }
1da177e4
LT		 5954};
5955
bff16c2f 5956static int __addrconf_sysctl_register(struct net *net, char *dev_name,
f8572d8f 5957 struct inet6_dev *idev, struct ipv6_devconf *p)
1da177e4
LT		 5958{
5959 int i;
607ea7cd 5960 struct ctl_table *table;
6105e293 5961 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ];
1dab6222 5962
607ea7cd
KK		 5963 table = kmemdup(addrconf_sysctl, sizeof(addrconf_sysctl), GFP_KERNEL);
5964 if (!table)
f68635e6
PE		 5965 goto out;
5966
607ea7cd
KK		 5967 for (i = 0; table[i].data; i++) {
5968 table[i].data += (char *)p - (char *)&ipv6_devconf;
5969 table[i].extra1 = idev; /* embedded; no ref */
5970 table[i].extra2 = net;
1da177e4 5971 }
1da177e4 5972
6105e293 5973 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name);
1da177e4 5974
607ea7cd
KK		 5975 p->sysctl_header = register_net_sysctl(net, path, table);
5976 if (!p->sysctl_header)
6105e293 5977 goto free;
f68635e6 5978
95897312 5979 return 0;
1da177e4 5980
f68635e6 5981free:
607ea7cd 5982 kfree(table);
f68635e6 5983out:
95897312 5984 return -ENOBUFS;
1da177e4
LT		 5985}
5986
408c4768
PE		 5987static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
5988{
607ea7cd 5989 struct ctl_table *table;
408c4768 5990
607ea7cd 5991 if (!p->sysctl_header)
408c4768
PE		 5992 return;
5993
607ea7cd
KK		 5994 table = p->sysctl_header->ctl_table_arg;
5995 unregister_net_sysctl_table(p->sysctl_header);
5996 p->sysctl_header = NULL;
5997 kfree(table);
408c4768
PE		 5998}
5999
a317a2f1 6000static int addrconf_sysctl_register(struct inet6_dev *idev)
f52295a9 6001{
a317a2f1
WC		 6002 int err;
6003
6004 if (!sysctl_dev_name_is_allowed(idev->dev->name))
6005 return -EINVAL;
6006
6007 err = neigh_sysctl_register(idev->dev, idev->nd_parms,
6008 &ndisc_ifinfo_sysctl_change);
6009 if (err)
6010 return err;
6011 err = __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
6012 idev, &idev->cnf);
6013 if (err)
6014 neigh_sysctl_unregister(idev->nd_parms);
6015
6016 return err;
f52295a9
PE		 6017}
6018
408c4768 6019static void addrconf_sysctl_unregister(struct inet6_dev *idev)
1da177e4 6020{
408c4768
PE		 6021 __addrconf_sysctl_unregister(&idev->cnf);
6022 neigh_sysctl_unregister(idev->nd_parms);
1da177e4
LT		 6023}
6024
6025
6026#endif
6027
2c8c1e72 6028static int __net_init addrconf_init_net(struct net *net)
e0da5a48 6029{
a79ca223 6030 int err = -ENOMEM;
e0da5a48
PE		 6031 struct ipv6_devconf *all, *dflt;
6032
a79ca223 6033 all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL);
63159f29 6034 if (!all)
a79ca223 6035 goto err_alloc_all;
e0da5a48 6036
a79ca223 6037 dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
63159f29 6038 if (!dflt)
a79ca223 6039 goto err_alloc_dflt;
e0da5a48 6040
a79ca223
HZ		 6041 /* these will be inherited by all namespaces */
6042 dflt->autoconf = ipv6_defaults.autoconf;
6043 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
e0da5a48 6044
3d1bec99
HFS		 6045 dflt->stable_secret.initialized = false;
6046 all->stable_secret.initialized = false;
6047
e0da5a48
PE		 6048 net->ipv6.devconf_all = all;
6049 net->ipv6.devconf_dflt = dflt;
6050
6051#ifdef CONFIG_SYSCTL
f8572d8f 6052 err = __addrconf_sysctl_register(net, "all", NULL, all);
e0da5a48
PE		 6053 if (err < 0)
6054 goto err_reg_all;
6055
f8572d8f 6056 err = __addrconf_sysctl_register(net, "default", NULL, dflt);
e0da5a48
PE		 6057 if (err < 0)
6058 goto err_reg_dflt;
6059#endif
6060 return 0;
6061
6062#ifdef CONFIG_SYSCTL
6063err_reg_dflt:
6064 __addrconf_sysctl_unregister(all);
6065err_reg_all:
6066 kfree(dflt);
6067#endif
6068err_alloc_dflt:
6069 kfree(all);
6070err_alloc_all:
6071 return err;
6072}
6073
2c8c1e72 6074static void __net_exit addrconf_exit_net(struct net *net)
e0da5a48
PE		 6075{
6076#ifdef CONFIG_SYSCTL
6077 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
6078 __addrconf_sysctl_unregister(net->ipv6.devconf_all);
6079#endif
73cf0e92 6080 kfree(net->ipv6.devconf_dflt);
6081 kfree(net->ipv6.devconf_all);
e0da5a48
PE		 6082}
6083
6084static struct pernet_operations addrconf_ops = {
6085 .init = addrconf_init_net,
6086 .exit = addrconf_exit_net,
6087};
6088
207895fd 6089static struct rtnl_af_ops inet6_ops __read_mostly = {
b382b191
TG		 6090 .family = AF_INET6,
6091 .fill_link_af = inet6_fill_link_af,
6092 .get_link_af_size = inet6_get_link_af_size,
11b1f828 6093 .validate_link_af = inet6_validate_link_af,
f53adae4 6094 .set_link_af = inet6_set_link_af,
b382b191
TG		 6095};
6096
1da177e4
LT		 6097/*
6098 * Init / cleanup code
6099 */
6100
6101int __init addrconf_init(void)
6102{
a317a2f1 6103 struct inet6_dev *idev;
c2e21293 6104 int i, err;
2a8cc6c8 6105
e21e8467
SH		 6106 err = ipv6_addr_label_init();
6107 if (err < 0) {
f3213831
JP		 6108 pr_crit("%s: cannot initialize default policy table: %d\n",
6109 __func__, err);
2cc6d2bf 6110 goto out;
2a8cc6c8 6111 }
1da177e4 6112
2cc6d2bf
NH		 6113 err = register_pernet_subsys(&addrconf_ops);
6114 if (err < 0)
6115 goto out_addrlabel;
e0da5a48 6116
c15b1cca
HFS		 6117 addrconf_wq = create_workqueue("ipv6_addrconf");
6118 if (!addrconf_wq) {
6119 err = -ENOMEM;
6120 goto out_nowq;
6121 }
6122
1da177e4
LT		 6123 /* The addrconf netdev notifier requires that loopback_dev
6124 * has it's ipv6 private information allocated and setup
6125 * before it can bring up and give link-local addresses
6126 * to other devices which are up.
6127 *
6128 * Unfortunately, loopback_dev is not necessarily the first
6129 * entry in the global dev_base list of net devices. In fact,
6130 * it is likely to be the very last entry on that list.
6131 * So this causes the notifier registry below to try and
6132 * give link-local addresses to all devices besides loopback_dev
6133 * first, then loopback_dev, which cases all the non-loopback_dev
6134 * devices to fail to get a link-local address.
6135 *
6136 * So, as a temporary fix, allocate the ipv6 structure for
6137 * loopback_dev first by hand.
6138 * Longer term, all of the dependencies ipv6 has upon the loopback
6139 * device and it being up should be removed.
6140 */
6141 rtnl_lock();
a317a2f1 6142 idev = ipv6_add_dev(init_net.loopback_dev);
1da177e4 6143 rtnl_unlock();
a317a2f1
WC		 6144 if (IS_ERR(idev)) {
6145 err = PTR_ERR(idev);
e0da5a48 6146 goto errlo;
a317a2f1 6147 }
1da177e4 6148
c2e21293 6149 for (i = 0; i < IN6_ADDR_HSIZE; i++)
6150 INIT_HLIST_HEAD(&inet6_addr_lst[i]);
6151
1da177e4
LT		 6152 register_netdevice_notifier(&ipv6_dev_notf);
6153
c15b1cca 6154 addrconf_verify();
c127ea2c 6155
3678a9d8 6156 rtnl_af_register(&inet6_ops);
b382b191 6157
c7ac8679
GR		 6158 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo,
6159 NULL);
c127ea2c
TG		 6160 if (err < 0)
6161 goto errout;
6162
6163 /* Only the first call to __rtnl_register can fail */
c7ac8679
GR		 6164 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL, NULL);
6165 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL, NULL);
6166 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr,
6167 inet6_dump_ifaddr, NULL);
6168 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL,
6169 inet6_dump_ifmcaddr, NULL);
6170 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL,
6171 inet6_dump_ifacaddr, NULL);
76f8f6cb 6172 __rtnl_register(PF_INET6, RTM_GETNETCONF, inet6_netconf_get_devconf,
7a674200 6173 inet6_netconf_dump_devconf, NULL);
c127ea2c 6174
2a8cc6c8
YH		 6175 ipv6_addr_label_rtnl_register();
6176
1da177e4 6177 return 0;
c127ea2c 6178errout:
b382b191 6179 rtnl_af_unregister(&inet6_ops);
c127ea2c 6180 unregister_netdevice_notifier(&ipv6_dev_notf);
e0da5a48 6181errlo:
c15b1cca
HFS		 6182 destroy_workqueue(addrconf_wq);
6183out_nowq:
e0da5a48 6184 unregister_pernet_subsys(&addrconf_ops);
2cc6d2bf
NH		 6185out_addrlabel:
6186 ipv6_addr_label_cleanup();
6187out:
c127ea2c 6188 return err;
1da177e4
LT		 6189}
6190
09f7709f 6191void addrconf_cleanup(void)
1da177e4 6192{
176c39af 6193 struct net_device *dev;
1da177e4
LT		 6194 int i;
6195
6196 unregister_netdevice_notifier(&ipv6_dev_notf);
e0da5a48 6197 unregister_pernet_subsys(&addrconf_ops);
2cc6d2bf 6198 ipv6_addr_label_cleanup();
1da177e4
LT		 6199
6200 rtnl_lock();
6201
b382b191
TG		 6202 __rtnl_af_unregister(&inet6_ops);
6203
176c39af
DL		 6204 /* clean dev list */
6205 for_each_netdev(&init_net, dev) {
6206 if (__in6_dev_get(dev) == NULL)
6207 continue;
6208 addrconf_ifdown(dev, 1);
6209 }
6210 addrconf_ifdown(init_net.loopback_dev, 2);
6211
1da177e4
LT		 6212 /*
6213 * Check hash table.
6214 */
5c578aed 6215 spin_lock_bh(&addrconf_hash_lock);
c2e21293 6216 for (i = 0; i < IN6_ADDR_HSIZE; i++)
6217 WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
5c578aed 6218 spin_unlock_bh(&addrconf_hash_lock);
c15b1cca 6219 cancel_delayed_work(&addr_chk_work);
1da177e4 6220 rtnl_unlock();
c15b1cca
HFS		 6221
6222 destroy_workqueue(addrconf_wq);
1da177e4 6223}
Linux kernel - Deliverables
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