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ipv6: collapse state_lock and lock
[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
06a4c1c5 73#include <net/af_ieee802154.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>
1da177e4
LT		 84#include <linux/if_tunnel.h>
85#include <linux/rtnetlink.h>
f3a1bfb1 86#include <linux/netconf.h>
1da177e4 87#include <linux/random.h>
e21e8467 88#include <linux/uaccess.h>
7f7d9a6b 89#include <asm/unaligned.h>
1da177e4
LT		 90
91#include <linux/proc_fs.h>
92#include <linux/seq_file.h>
bc3b2d7f 93#include <linux/export.h>
1da177e4
LT		 94
95/* Set to 3 to get tracing... */
96#define ACONF_DEBUG 2
97
98#if ACONF_DEBUG >= 3
ba3542e1 99#define ADBG(fmt, ...) printk(fmt, ##__VA_ARGS__)
1da177e4 100#else
ba3542e1 101#define ADBG(fmt, ...) do { if (0) printk(fmt, ##__VA_ARGS__); } while (0)
1da177e4
LT		 102#endif
103
104#define INFINITY_LIFE_TIME 0xFFFFFFFF
18a31e1e 105
3d1bec99
HFS		 106#define IPV6_MAX_STRLEN \
107 sizeof("ffff:ffff:ffff:ffff:ffff:ffff:255.255.255.255")
108
18a31e1e
TG		 109static inline u32 cstamp_delta(unsigned long cstamp)
110{
111 return (cstamp - INITIAL_JIFFIES) * 100UL / HZ;
112}
1da177e4
LT		 113
114#ifdef CONFIG_SYSCTL
a317a2f1 115static int addrconf_sysctl_register(struct inet6_dev *idev);
408c4768
PE		 116static void addrconf_sysctl_unregister(struct inet6_dev *idev);
117#else
a317a2f1 118static inline int addrconf_sysctl_register(struct inet6_dev *idev)
408c4768 119{
a317a2f1 120 return 0;
408c4768
PE		 121}
122
123static inline void addrconf_sysctl_unregister(struct inet6_dev *idev)
124{
125}
1da177e4
LT		 126#endif
127
eb7e0575
SD		 128static void __ipv6_regen_rndid(struct inet6_dev *idev);
129static void __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
1da177e4 130static void ipv6_regen_rndid(unsigned long data);
1da177e4 131
1b34be74 132static int ipv6_generate_eui64(u8 *eui, struct net_device *dev);
1da177e4 133static int ipv6_count_addresses(struct inet6_dev *idev);
622c81d5
HFS		 134static int ipv6_generate_stable_address(struct in6_addr *addr,
135 u8 dad_count,
136 const struct inet6_dev *idev);
1da177e4
LT		 137
138/*
139 * Configured unicast address hash table
140 */
c2e21293 141static struct hlist_head inet6_addr_lst[IN6_ADDR_HSIZE];
5c578aed 142static DEFINE_SPINLOCK(addrconf_hash_lock);
1da177e4 143
c15b1cca
HFS		 144static void addrconf_verify(void);
145static void addrconf_verify_rtnl(void);
146static void addrconf_verify_work(struct work_struct *);
1da177e4 147
c15b1cca
HFS		 148static struct workqueue_struct *addrconf_wq;
149static DECLARE_DELAYED_WORK(addr_chk_work, addrconf_verify_work);
1da177e4
LT		 150
151static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
152static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
153
93d9b7d7
JP		 154static void addrconf_type_change(struct net_device *dev,
155 unsigned long event);
1da177e4
LT		 156static int addrconf_ifdown(struct net_device *dev, int how);
157
21caa662
RK		 158static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
159 int plen,
160 const struct net_device *dev,
161 u32 flags, u32 noflags);
162
cf22f9a2 163static void addrconf_dad_start(struct inet6_ifaddr *ifp);
c15b1cca 164static void addrconf_dad_work(struct work_struct *w);
1da177e4 165static void addrconf_dad_completed(struct inet6_ifaddr *ifp);
c5e33bdd 166static void addrconf_dad_run(struct inet6_dev *idev);
1da177e4
LT		 167static void addrconf_rs_timer(unsigned long data);
168static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
169static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
170
1ab1457c 171static void inet6_prefix_notify(int event, struct inet6_dev *idev,
1da177e4 172 struct prefix_info *pinfo);
3e81c6da
DM		 173static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
174 struct net_device *dev);
1da177e4 175
888c848e 176static struct ipv6_devconf ipv6_devconf __read_mostly = {
1da177e4
LT		 177 .forwarding = 0,
178 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
179 .mtu6 = IPV6_MIN_MTU,
180 .accept_ra = 1,
181 .accept_redirects = 1,
182 .autoconf = 1,
183 .force_mld_version = 0,
fc4eba58
HFS		 184 .mldv1_unsolicited_report_interval = 10 * HZ,
185 .mldv2_unsolicited_report_interval = HZ,
1da177e4
LT		 186 .dad_transmits = 1,
187 .rtr_solicits = MAX_RTR_SOLICITATIONS,
188 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
189 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
67ba4152 190 .use_tempaddr = 0,
1da177e4
LT		 191 .temp_valid_lft = TEMP_VALID_LIFETIME,
192 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
193 .regen_max_retry = REGEN_MAX_RETRY,
194 .max_desync_factor = MAX_DESYNC_FACTOR,
1da177e4 195 .max_addresses = IPV6_MAX_ADDRESSES,
65f5c7c1 196 .accept_ra_defrtr = 1,
d9333196 197 .accept_ra_from_local = 0,
c4fd30eb 198 .accept_ra_pinfo = 1,
930d6ff2
YH		 199#ifdef CONFIG_IPV6_ROUTER_PREF
200 .accept_ra_rtr_pref = 1,
52e16356 201 .rtr_probe_interval = 60 * HZ,
09c884d4
YH		 202#ifdef CONFIG_IPV6_ROUTE_INFO
203 .accept_ra_rt_info_max_plen = 0,
204#endif
930d6ff2 205#endif
fbea49e1 206 .proxy_ndp = 0,
0bcbc926 207 .accept_source_route = 0, /* we do not accept RH0 by default. */
778d80be 208 .disable_ipv6 = 0,
1b34be74 209 .accept_dad = 1,
b800c3b9 210 .suppress_frag_ndisc = 1,
c2943f14 211 .accept_ra_mtu = 1,
3d1bec99
HFS		 212 .stable_secret = {
213 .initialized = false,
214 }
1da177e4
LT		 215};
216
ab32ea5d 217static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
1da177e4
LT		 218 .forwarding = 0,
219 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
220 .mtu6 = IPV6_MIN_MTU,
221 .accept_ra = 1,
222 .accept_redirects = 1,
223 .autoconf = 1,
fc4eba58
HFS		 224 .force_mld_version = 0,
225 .mldv1_unsolicited_report_interval = 10 * HZ,
226 .mldv2_unsolicited_report_interval = HZ,
1da177e4
LT		 227 .dad_transmits = 1,
228 .rtr_solicits = MAX_RTR_SOLICITATIONS,
229 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
230 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
1da177e4
LT		 231 .use_tempaddr = 0,
232 .temp_valid_lft = TEMP_VALID_LIFETIME,
233 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
234 .regen_max_retry = REGEN_MAX_RETRY,
235 .max_desync_factor = MAX_DESYNC_FACTOR,
1da177e4 236 .max_addresses = IPV6_MAX_ADDRESSES,
65f5c7c1 237 .accept_ra_defrtr = 1,
d9333196 238 .accept_ra_from_local = 0,
c4fd30eb 239 .accept_ra_pinfo = 1,
930d6ff2
YH		 240#ifdef CONFIG_IPV6_ROUTER_PREF
241 .accept_ra_rtr_pref = 1,
52e16356 242 .rtr_probe_interval = 60 * HZ,
09c884d4
YH		 243#ifdef CONFIG_IPV6_ROUTE_INFO
244 .accept_ra_rt_info_max_plen = 0,
245#endif
930d6ff2 246#endif
fbea49e1 247 .proxy_ndp = 0,
0bcbc926 248 .accept_source_route = 0, /* we do not accept RH0 by default. */
778d80be 249 .disable_ipv6 = 0,
1b34be74 250 .accept_dad = 1,
b800c3b9 251 .suppress_frag_ndisc = 1,
c2943f14 252 .accept_ra_mtu = 1,
3d1bec99
HFS		 253 .stable_secret = {
254 .initialized = false,
255 },
1da177e4
LT		 256};
257
f24e3d65 258/* Check if a valid qdisc is available */
05297949 259static inline bool addrconf_qdisc_ok(const struct net_device *dev)
f24e3d65 260{
05297949 261 return !qdisc_tx_is_noop(dev);
f24e3d65
MC		 262}
263
b7b1bfce 264static void addrconf_del_rs_timer(struct inet6_dev *idev)
1da177e4 265{
b7b1bfce
HFS		 266 if (del_timer(&idev->rs_timer))
267 __in6_dev_put(idev);
268}
269
c15b1cca 270static void addrconf_del_dad_work(struct inet6_ifaddr *ifp)
b7b1bfce 271{
c15b1cca 272 if (cancel_delayed_work(&ifp->dad_work))
1da177e4
LT		 273 __in6_ifa_put(ifp);
274}
275
b7b1bfce
HFS		 276static void addrconf_mod_rs_timer(struct inet6_dev *idev,
277 unsigned long when)
278{
279 if (!timer_pending(&idev->rs_timer))
280 in6_dev_hold(idev);
281 mod_timer(&idev->rs_timer, jiffies + when);
282}
1da177e4 283
c15b1cca
HFS		 284static void addrconf_mod_dad_work(struct inet6_ifaddr *ifp,
285 unsigned long delay)
1da177e4 286{
c15b1cca 287 if (!delayed_work_pending(&ifp->dad_work))
1da177e4 288 in6_ifa_hold(ifp);
c15b1cca 289 mod_delayed_work(addrconf_wq, &ifp->dad_work, delay);
1da177e4
LT		 290}
291
7f7d9a6b
HX		 292static int snmp6_alloc_dev(struct inet6_dev *idev)
293{
827da44c
JS		 294 int i;
295
698365fa
WC		 296 idev->stats.ipv6 = alloc_percpu(struct ipstats_mib);
297 if (!idev->stats.ipv6)
7f7d9a6b 298 goto err_ip;
827da44c
JS		 299
300 for_each_possible_cpu(i) {
301 struct ipstats_mib *addrconf_stats;
698365fa 302 addrconf_stats = per_cpu_ptr(idev->stats.ipv6, i);
827da44c 303 u64_stats_init(&addrconf_stats->syncp);
827da44c
JS		 304 }
305
306
be281e55
ED		 307 idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device),
308 GFP_KERNEL);
309 if (!idev->stats.icmpv6dev)
7f7d9a6b 310 goto err_icmp;
be281e55
ED		 311 idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device),
312 GFP_KERNEL);
313 if (!idev->stats.icmpv6msgdev)
14878f75 314 goto err_icmpmsg;
7f7d9a6b
HX		 315
316 return 0;
317
14878f75 318err_icmpmsg:
be281e55 319 kfree(idev->stats.icmpv6dev);
7f7d9a6b 320err_icmp:
698365fa 321 free_percpu(idev->stats.ipv6);
7f7d9a6b 322err_ip:
aaf70ec7 323 return -ENOMEM;
7f7d9a6b
HX		 324}
325
8e5e8f30 326static struct inet6_dev *ipv6_add_dev(struct net_device *dev)
1da177e4
LT		 327{
328 struct inet6_dev *ndev;
a317a2f1 329 int err = -ENOMEM;
1da177e4
LT		 330
331 ASSERT_RTNL();
332
333 if (dev->mtu < IPV6_MIN_MTU)
a317a2f1 334 return ERR_PTR(-EINVAL);
1da177e4 335
1ab1457c 336 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
1ab1457c 337 if (ndev == NULL)
a317a2f1 338 return ERR_PTR(err);
322f74a4
IO		 339
340 rwlock_init(&ndev->lock);
341 ndev->dev = dev;
502a2ffd 342 INIT_LIST_HEAD(&ndev->addr_list);
b7b1bfce
HFS		 343 setup_timer(&ndev->rs_timer, addrconf_rs_timer,
344 (unsigned long)ndev);
c346dca1 345 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf));
322f74a4
IO		 346 ndev->cnf.mtu6 = dev->mtu;
347 ndev->cnf.sysctl = NULL;
348 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
349 if (ndev->nd_parms == NULL) {
350 kfree(ndev);
a317a2f1 351 return ERR_PTR(err);
322f74a4 352 }
0187bdfb
BH		 353 if (ndev->cnf.forwarding)
354 dev_disable_lro(dev);
322f74a4
IO		 355 /* We refer to the device */
356 dev_hold(dev);
1da177e4 357
322f74a4 358 if (snmp6_alloc_dev(ndev) < 0) {
ba3542e1 359 ADBG(KERN_WARNING
f3213831 360 "%s: cannot allocate memory for statistics; dev=%s.\n",
ba3542e1 361 __func__, dev->name);
322f74a4 362 neigh_parms_release(&nd_tbl, ndev->nd_parms);
8603e33d
RL		 363 dev_put(dev);
364 kfree(ndev);
a317a2f1 365 return ERR_PTR(err);
322f74a4 366 }
1da177e4 367
322f74a4 368 if (snmp6_register_dev(ndev) < 0) {
ba3542e1 369 ADBG(KERN_WARNING
f3213831 370 "%s: cannot create /proc/net/dev_snmp6/%s\n",
ba3542e1 371 __func__, dev->name);
a317a2f1 372 goto err_release;
322f74a4
IO		 373 }
374
375 /* One reference from device. We must do this before
376 * we invoke __ipv6_regen_rndid().
377 */
378 in6_dev_hold(ndev);
1da177e4 379
1b34be74
YH		 380 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
381 ndev->cnf.accept_dad = -1;
382
07a93626 383#if IS_ENABLED(CONFIG_IPV6_SIT)
b077d7ab 384 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
f3213831 385 pr_info("%s: Disabled Multicast RS\n", dev->name);
b077d7ab
YH		 386 ndev->cnf.rtr_solicits = 0;
387 }
388#endif
389
372e6c8f 390 INIT_LIST_HEAD(&ndev->tempaddr_list);
b24b8a24 391 setup_timer(&ndev->regen_timer, ipv6_regen_rndid, (unsigned long)ndev);
322f74a4
IO		 392 if ((dev->flags&IFF_LOOPBACK) ||
393 dev->type == ARPHRD_TUNNEL ||
9625ed72 394 dev->type == ARPHRD_TUNNEL6 ||
0be669bb 395 dev->type == ARPHRD_SIT ||
0be669bb 396 dev->type == ARPHRD_NONE) {
322f74a4
IO		 397 ndev->cnf.use_tempaddr = -1;
398 } else {
399 in6_dev_hold(ndev);
400 ipv6_regen_rndid((unsigned long) ndev);
401 }
5d9efa7e 402
914faa14 403 ndev->token = in6addr_any;
1da177e4 404
f24e3d65 405 if (netif_running(dev) && addrconf_qdisc_ok(dev))
53aadcc9
HX		 406 ndev->if_flags |= IF_READY;
407
322f74a4
IO		 408 ipv6_mc_init_dev(ndev);
409 ndev->tstamp = jiffies;
a317a2f1
WC		 410 err = addrconf_sysctl_register(ndev);
411 if (err) {
412 ipv6_mc_destroy_dev(ndev);
413 del_timer(&ndev->regen_timer);
414 goto err_release;
415 }
30c4cf57 416 /* protected by rtnl_lock */
cf778b00 417 rcu_assign_pointer(dev->ip6_ptr, ndev);
d88ae4cc 418
2c5e8933
HFS		 419 /* Join interface-local all-node multicast group */
420 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allnodes);
421
d88ae4cc 422 /* Join all-node multicast group */
f3ee4010 423 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);
d88ae4cc 424
d6ddef9e 425 /* Join all-router multicast group if forwarding is set */
8b2aaede 426 if (ndev->cnf.forwarding && (dev->flags & IFF_MULTICAST))
d6ddef9e
LW		 427 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
428
1da177e4 429 return ndev;
a317a2f1
WC		 430
431err_release:
432 neigh_parms_release(&nd_tbl, ndev->nd_parms);
433 ndev->dead = 1;
434 in6_dev_finish_destroy(ndev);
435 return ERR_PTR(err);
1da177e4
LT		 436}
437
8e5e8f30 438static struct inet6_dev *ipv6_find_idev(struct net_device *dev)
1da177e4
LT		 439{
440 struct inet6_dev *idev;
441
442 ASSERT_RTNL();
443
e21e8467
SH		 444 idev = __in6_dev_get(dev);
445 if (!idev) {
446 idev = ipv6_add_dev(dev);
a317a2f1 447 if (IS_ERR(idev))
1da177e4
LT		 448 return NULL;
449 }
c5e33bdd 450
1da177e4
LT		 451 if (dev->flags&IFF_UP)
452 ipv6_mc_up(idev);
453 return idev;
454}
455
f3a1bfb1
ND		 456static int inet6_netconf_msgsize_devconf(int type)
457{
458 int size = NLMSG_ALIGN(sizeof(struct netconfmsg))
459 + nla_total_size(4); /* NETCONFA_IFINDEX */
460
76f8f6cb
ND		 461 /* type -1 is used for ALL */
462 if (type == -1 || type == NETCONFA_FORWARDING)
f3a1bfb1 463 size += nla_total_size(4);
b1afce95 464#ifdef CONFIG_IPV6_MROUTE
d67b8c61
ND		 465 if (type == -1 || type == NETCONFA_MC_FORWARDING)
466 size += nla_total_size(4);
b1afce95 467#endif
c92d5491 468 if (type == -1 || type == NETCONFA_PROXY_NEIGH)
469 size += nla_total_size(4);
f3a1bfb1
ND		 470
471 return size;
472}
473
474static int inet6_netconf_fill_devconf(struct sk_buff *skb, int ifindex,
475 struct ipv6_devconf *devconf, u32 portid,
476 u32 seq, int event, unsigned int flags,
477 int type)
478{
479 struct nlmsghdr *nlh;
480 struct netconfmsg *ncm;
481
482 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg),
483 flags);
484 if (nlh == NULL)
485 return -EMSGSIZE;
486
487 ncm = nlmsg_data(nlh);
488 ncm->ncm_family = AF_INET6;
489
490 if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0)
491 goto nla_put_failure;
492
76f8f6cb
ND		 493 /* type -1 is used for ALL */
494 if ((type == -1 || type == NETCONFA_FORWARDING) &&
f3a1bfb1
ND		 495 nla_put_s32(skb, NETCONFA_FORWARDING, devconf->forwarding) < 0)
496 goto nla_put_failure;
b1afce95 497#ifdef CONFIG_IPV6_MROUTE
d67b8c61
ND		 498 if ((type == -1 || type == NETCONFA_MC_FORWARDING) &&
499 nla_put_s32(skb, NETCONFA_MC_FORWARDING,
500 devconf->mc_forwarding) < 0)
501 goto nla_put_failure;
b1afce95 502#endif
c92d5491 503 if ((type == -1 || type == NETCONFA_PROXY_NEIGH) &&
504 nla_put_s32(skb, NETCONFA_PROXY_NEIGH, devconf->proxy_ndp) < 0)
505 goto nla_put_failure;
506
053c095a
JB		 507 nlmsg_end(skb, nlh);
508 return 0;
f3a1bfb1
ND		 509
510nla_put_failure:
511 nlmsg_cancel(skb, nlh);
512 return -EMSGSIZE;
513}
514
d67b8c61
ND		 515void inet6_netconf_notify_devconf(struct net *net, int type, int ifindex,
516 struct ipv6_devconf *devconf)
f3a1bfb1
ND		 517{
518 struct sk_buff *skb;
519 int err = -ENOBUFS;
520
521 skb = nlmsg_new(inet6_netconf_msgsize_devconf(type), GFP_ATOMIC);
522 if (skb == NULL)
523 goto errout;
524
525 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 0, 0,
526 RTM_NEWNETCONF, 0, type);
527 if (err < 0) {
528 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
529 WARN_ON(err == -EMSGSIZE);
530 kfree_skb(skb);
531 goto errout;
532 }
533 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_NETCONF, NULL, GFP_ATOMIC);
534 return;
535errout:
bd779028 536 rtnl_set_sk_err(net, RTNLGRP_IPV6_NETCONF, err);
f3a1bfb1
ND		 537}
538
76f8f6cb
ND		 539static const struct nla_policy devconf_ipv6_policy[NETCONFA_MAX+1] = {
540 [NETCONFA_IFINDEX] = { .len = sizeof(int) },
541 [NETCONFA_FORWARDING] = { .len = sizeof(int) },
c92d5491 542 [NETCONFA_PROXY_NEIGH] = { .len = sizeof(int) },
76f8f6cb
ND		 543};
544
545static int inet6_netconf_get_devconf(struct sk_buff *in_skb,
661d2967 546 struct nlmsghdr *nlh)
76f8f6cb
ND		 547{
548 struct net *net = sock_net(in_skb->sk);
549 struct nlattr *tb[NETCONFA_MAX+1];
550 struct netconfmsg *ncm;
551 struct sk_buff *skb;
552 struct ipv6_devconf *devconf;
553 struct inet6_dev *in6_dev;
554 struct net_device *dev;
555 int ifindex;
556 int err;
557
558 err = nlmsg_parse(nlh, sizeof(*ncm), tb, NETCONFA_MAX,
559 devconf_ipv6_policy);
560 if (err < 0)
561 goto errout;
562
563 err = EINVAL;
564 if (!tb[NETCONFA_IFINDEX])
565 goto errout;
566
567 ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]);
568 switch (ifindex) {
569 case NETCONFA_IFINDEX_ALL:
570 devconf = net->ipv6.devconf_all;
571 break;
572 case NETCONFA_IFINDEX_DEFAULT:
573 devconf = net->ipv6.devconf_dflt;
574 break;
575 default:
576 dev = __dev_get_by_index(net, ifindex);
577 if (dev == NULL)
578 goto errout;
579 in6_dev = __in6_dev_get(dev);
580 if (in6_dev == NULL)
581 goto errout;
582 devconf = &in6_dev->cnf;
583 break;
584 }
585
586 err = -ENOBUFS;
587 skb = nlmsg_new(inet6_netconf_msgsize_devconf(-1), GFP_ATOMIC);
588 if (skb == NULL)
589 goto errout;
590
591 err = inet6_netconf_fill_devconf(skb, ifindex, devconf,
592 NETLINK_CB(in_skb).portid,
593 nlh->nlmsg_seq, RTM_NEWNETCONF, 0,
594 -1);
595 if (err < 0) {
596 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
597 WARN_ON(err == -EMSGSIZE);
598 kfree_skb(skb);
599 goto errout;
600 }
601 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
602errout:
603 return err;
604}
605
7a674200
ND		 606static int inet6_netconf_dump_devconf(struct sk_buff *skb,
607 struct netlink_callback *cb)
608{
609 struct net *net = sock_net(skb->sk);
610 int h, s_h;
611 int idx, s_idx;
612 struct net_device *dev;
613 struct inet6_dev *idev;
614 struct hlist_head *head;
615
616 s_h = cb->args[0];
617 s_idx = idx = cb->args[1];
618
619 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
620 idx = 0;
621 head = &net->dev_index_head[h];
622 rcu_read_lock();
63998ac2
ND		 623 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^
624 net->dev_base_seq;
7a674200
ND		 625 hlist_for_each_entry_rcu(dev, head, index_hlist) {
626 if (idx < s_idx)
627 goto cont;
628 idev = __in6_dev_get(dev);
629 if (!idev)
630 goto cont;
631
632 if (inet6_netconf_fill_devconf(skb, dev->ifindex,
633 &idev->cnf,
634 NETLINK_CB(cb->skb).portid,
635 cb->nlh->nlmsg_seq,
636 RTM_NEWNETCONF,
637 NLM_F_MULTI,
053c095a 638 -1) < 0) {
7a674200
ND		 639 rcu_read_unlock();
640 goto done;
641 }
63998ac2 642 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
7a674200
ND		 643cont:
644 idx++;
645 }
646 rcu_read_unlock();
647 }
648 if (h == NETDEV_HASHENTRIES) {
649 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL,
650 net->ipv6.devconf_all,
651 NETLINK_CB(cb->skb).portid,
652 cb->nlh->nlmsg_seq,
653 RTM_NEWNETCONF, NLM_F_MULTI,
053c095a 654 -1) < 0)
7a674200
ND		 655 goto done;
656 else
657 h++;
658 }
659 if (h == NETDEV_HASHENTRIES + 1) {
660 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT,
661 net->ipv6.devconf_dflt,
662 NETLINK_CB(cb->skb).portid,
663 cb->nlh->nlmsg_seq,
664 RTM_NEWNETCONF, NLM_F_MULTI,
053c095a 665 -1) < 0)
7a674200
ND		 666 goto done;
667 else
668 h++;
669 }
670done:
671 cb->args[0] = h;
672 cb->args[1] = idx;
673
674 return skb->len;
675}
676
1da177e4
LT		 677#ifdef CONFIG_SYSCTL
678static void dev_forward_change(struct inet6_dev *idev)
679{
680 struct net_device *dev;
681 struct inet6_ifaddr *ifa;
1da177e4
LT		 682
683 if (!idev)
684 return;
685 dev = idev->dev;
0187bdfb
BH		 686 if (idev->cnf.forwarding)
687 dev_disable_lro(dev);
1a940835 688 if (dev->flags & IFF_MULTICAST) {
2c5e8933 689 if (idev->cnf.forwarding) {
f3ee4010 690 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
2c5e8933
HFS		 691 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allrouters);
692 ipv6_dev_mc_inc(dev, &in6addr_sitelocal_allrouters);
693 } else {
f3ee4010 694 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
2c5e8933
HFS		 695 ipv6_dev_mc_dec(dev, &in6addr_interfacelocal_allrouters);
696 ipv6_dev_mc_dec(dev, &in6addr_sitelocal_allrouters);
697 }
1da177e4 698 }
502a2ffd 699
700 list_for_each_entry(ifa, &idev->addr_list, if_list) {
2c12a74c
MW		 701 if (ifa->flags&IFA_F_TENTATIVE)
702 continue;
1da177e4
LT		 703 if (idev->cnf.forwarding)
704 addrconf_join_anycast(ifa);
705 else
706 addrconf_leave_anycast(ifa);
707 }
f3a1bfb1
ND		 708 inet6_netconf_notify_devconf(dev_net(dev), NETCONFA_FORWARDING,
709 dev->ifindex, &idev->cnf);
1da177e4
LT		 710}
711
712
e186932b 713static void addrconf_forward_change(struct net *net, __s32 newf)
1da177e4
LT		 714{
715 struct net_device *dev;
716 struct inet6_dev *idev;
717
4acd4945 718 for_each_netdev(net, dev) {
1da177e4
LT		 719 idev = __in6_dev_get(dev);
720 if (idev) {
e186932b
PE		 721 int changed = (!idev->cnf.forwarding) ^ (!newf);
722 idev->cnf.forwarding = newf;
1da177e4
LT		 723 if (changed)
724 dev_forward_change(idev);
725 }
1da177e4 726 }
1da177e4 727}
c8fecf22 728
013d97e9 729static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf)
c8fecf22 730{
bff16c2f 731 struct net *net;
013d97e9
FR		 732 int old;
733
734 if (!rtnl_trylock())
735 return restart_syscall();
bff16c2f
PE		 736
737 net = (struct net *)table->extra2;
013d97e9
FR		 738 old = *p;
739 *p = newf;
b325fddb 740
013d97e9 741 if (p == &net->ipv6.devconf_dflt->forwarding) {
f3a1bfb1
ND		 742 if ((!newf) ^ (!old))
743 inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING,
744 NETCONFA_IFINDEX_DEFAULT,
745 net->ipv6.devconf_dflt);
013d97e9
FR		 746 rtnl_unlock();
747 return 0;
88af182e 748 }
c8fecf22 749
e186932b 750 if (p == &net->ipv6.devconf_all->forwarding) {
e186932b
PE		 751 net->ipv6.devconf_dflt->forwarding = newf;
752 addrconf_forward_change(net, newf);
f3a1bfb1
ND		 753 if ((!newf) ^ (!old))
754 inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING,
755 NETCONFA_IFINDEX_ALL,
756 net->ipv6.devconf_all);
013d97e9 757 } else if ((!newf) ^ (!old))
c8fecf22 758 dev_forward_change((struct inet6_dev *)table->extra1);
0187bdfb 759 rtnl_unlock();
c8fecf22 760
013d97e9 761 if (newf)
7b4da532 762 rt6_purge_dflt_routers(net);
b325fddb 763 return 1;
c8fecf22 764}
1da177e4
LT		 765#endif
766
5c578aed 767/* Nobody refers to this ifaddr, destroy it */
1da177e4
LT		 768void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
769{
c2e21293 770 WARN_ON(!hlist_unhashed(&ifp->addr_lst));
547b792c 771
1da177e4 772#ifdef NET_REFCNT_DEBUG
91df42be 773 pr_debug("%s\n", __func__);
1da177e4
LT		 774#endif
775
776 in6_dev_put(ifp->idev);
777
c15b1cca
HFS		 778 if (cancel_delayed_work(&ifp->dad_work))
779 pr_notice("delayed DAD work was pending while freeing ifa=%p\n",
780 ifp);
1da177e4 781
e9d3e084 782 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
f3213831 783 pr_warn("Freeing alive inet6 address %p\n", ifp);
1da177e4
LT		 784 return;
785 }
94e187c0 786 ip6_rt_put(ifp->rt);
1da177e4 787
e5785985 788 kfree_rcu(ifp, rcu);
1da177e4
LT		 789}
790
e55ffac6
BH		 791static void
792ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
793{
502a2ffd 794 struct list_head *p;
8a6ce0c0 795 int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
e55ffac6
BH		 796
797 /*
798 * Each device address list is sorted in order of scope -
799 * global before linklocal.
800 */
502a2ffd 801 list_for_each(p, &idev->addr_list) {
802 struct inet6_ifaddr *ifa
803 = list_entry(p, struct inet6_ifaddr, if_list);
8a6ce0c0 804 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
e55ffac6
BH		 805 break;
806 }
807
b54c9b98 808 list_add_tail(&ifp->if_list, p);
e55ffac6
BH		 809}
810
ddbe5032 811static u32 inet6_addr_hash(const struct in6_addr *addr)
3eb84f49 812{
ddbe5032 813 return hash_32(ipv6_addr_hash(addr), IN6_ADDR_HSIZE_SHIFT);
3eb84f49
YH		 814}
815
1da177e4
LT		 816/* On success it returns ifp with increased reference count */
817
818static struct inet6_ifaddr *
3f8f5298
JP		 819ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
820 const struct in6_addr *peer_addr, int pfxlen,
8a226b2c 821 int scope, u32 flags, u32 valid_lft, u32 prefered_lft)
1da177e4
LT		 822{
823 struct inet6_ifaddr *ifa = NULL;
824 struct rt6_info *rt;
3a88a81d 825 unsigned int hash;
1da177e4 826 int err = 0;
d68b8270
YH		 827 int addr_type = ipv6_addr_type(addr);
828
829 if (addr_type == IPV6_ADDR_ANY ||
830 addr_type & IPV6_ADDR_MULTICAST ||
831 (!(idev->dev->flags & IFF_LOOPBACK) &&
832 addr_type & IPV6_ADDR_LOOPBACK))
833 return ERR_PTR(-EADDRNOTAVAIL);
1da177e4 834
8814c4b5 835 rcu_read_lock_bh();
1da177e4
LT		 836 if (idev->dead) {
837 err = -ENODEV; /*XXX*/
838 goto out2;
839 }
840
56d417b1 841 if (idev->cnf.disable_ipv6) {
9bdd8d40
BH		 842 err = -EACCES;
843 goto out2;
844 }
845
5c578aed 846 spin_lock(&addrconf_hash_lock);
1da177e4
LT		 847
848 /* Ignore adding duplicate addresses on an interface */
c346dca1 849 if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) {
ba3542e1 850 ADBG("ipv6_add_addr: already assigned\n");
1da177e4
LT		 851 err = -EEXIST;
852 goto out;
853 }
854
322f74a4 855 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
1da177e4
LT		 856
857 if (ifa == NULL) {
ba3542e1 858 ADBG("ipv6_add_addr: malloc failed\n");
1da177e4
LT		 859 err = -ENOBUFS;
860 goto out;
861 }
862
8f031519 863 rt = addrconf_dst_alloc(idev, addr, false);
1da177e4
LT		 864 if (IS_ERR(rt)) {
865 err = PTR_ERR(rt);
866 goto out;
867 }
868
bba24896
JP		 869 neigh_parms_data_state_setall(idev->nd_parms);
870
4e3fd7a0 871 ifa->addr = *addr;
3f8f5298
JP		 872 if (peer_addr)
873 ifa->peer_addr = *peer_addr;
1da177e4
LT		 874
875 spin_lock_init(&ifa->lock);
c15b1cca 876 INIT_DELAYED_WORK(&ifa->dad_work, addrconf_dad_work);
c2e21293 877 INIT_HLIST_NODE(&ifa->addr_lst);
1da177e4
LT		 878 ifa->scope = scope;
879 ifa->prefix_len = pfxlen;
880 ifa->flags = flags | IFA_F_TENTATIVE;
8a226b2c
JB		 881 ifa->valid_lft = valid_lft;
882 ifa->prefered_lft = prefered_lft;
1da177e4 883 ifa->cstamp = ifa->tstamp = jiffies;
617fe29d 884 ifa->tokenized = false;
1da177e4 885
57f5f544
KF		 886 ifa->rt = rt;
887
1da177e4
LT		 888 ifa->idev = idev;
889 in6_dev_hold(idev);
890 /* For caller */
891 in6_ifa_hold(ifa);
892
893 /* Add to big hash table */
ddbe5032 894 hash = inet6_addr_hash(addr);
1da177e4 895
5c578aed 896 hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]);
5c578aed 897 spin_unlock(&addrconf_hash_lock);
1da177e4
LT		 898
899 write_lock(&idev->lock);
900 /* Add to inet6_dev unicast addr list. */
e55ffac6 901 ipv6_link_dev_addr(idev, ifa);
1da177e4 902
1da177e4 903 if (ifa->flags&IFA_F_TEMPORARY) {
372e6c8f 904 list_add(&ifa->tmp_list, &idev->tempaddr_list);
1da177e4
LT		 905 in6_ifa_hold(ifa);
906 }
1da177e4 907
1da177e4
LT		 908 in6_ifa_hold(ifa);
909 write_unlock(&idev->lock);
910out2:
8814c4b5 911 rcu_read_unlock_bh();
1da177e4 912
fd92833a 913 if (likely(err == 0))
f88c91dd 914 inet6addr_notifier_call_chain(NETDEV_UP, ifa);
1da177e4
LT		 915 else {
916 kfree(ifa);
917 ifa = ERR_PTR(err);
918 }
919
920 return ifa;
921out:
5c578aed 922 spin_unlock(&addrconf_hash_lock);
1da177e4
LT		 923 goto out2;
924}
925
5b84efec
TH		 926enum cleanup_prefix_rt_t {
927 CLEANUP_PREFIX_RT_NOP, /* no cleanup action for prefix route */
928 CLEANUP_PREFIX_RT_DEL, /* delete the prefix route */
929 CLEANUP_PREFIX_RT_EXPIRE, /* update the lifetime of the prefix route */
930};
931
932/*
933 * Check, whether the prefix for ifp would still need a prefix route
934 * after deleting ifp. The function returns one of the CLEANUP_PREFIX_RT_*
935 * constants.
936 *
937 * 1) we don't purge prefix if address was not permanent.
938 * prefix is managed by its own lifetime.
939 * 2) we also don't purge, if the address was IFA_F_NOPREFIXROUTE.
940 * 3) if there are no addresses, delete prefix.
941 * 4) if there are still other permanent address(es),
942 * corresponding prefix is still permanent.
943 * 5) if there are still other addresses with IFA_F_NOPREFIXROUTE,
944 * don't purge the prefix, assume user space is managing it.
945 * 6) otherwise, update prefix lifetime to the
946 * longest valid lifetime among the corresponding
947 * addresses on the device.
948 * Note: subsequent RA will update lifetime.
949 **/
950static enum cleanup_prefix_rt_t
951check_cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long *expires)
952{
953 struct inet6_ifaddr *ifa;
954 struct inet6_dev *idev = ifp->idev;
955 unsigned long lifetime;
956 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_DEL;
957
958 *expires = jiffies;
959
960 list_for_each_entry(ifa, &idev->addr_list, if_list) {
961 if (ifa == ifp)
962 continue;
963 if (!ipv6_prefix_equal(&ifa->addr, &ifp->addr,
964 ifp->prefix_len))
965 continue;
966 if (ifa->flags & (IFA_F_PERMANENT | IFA_F_NOPREFIXROUTE))
967 return CLEANUP_PREFIX_RT_NOP;
968
969 action = CLEANUP_PREFIX_RT_EXPIRE;
970
971 spin_lock(&ifa->lock);
972
973 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
974 /*
975 * Note: Because this address is
976 * not permanent, lifetime <
977 * LONG_MAX / HZ here.
978 */
979 if (time_before(*expires, ifa->tstamp + lifetime * HZ))
980 *expires = ifa->tstamp + lifetime * HZ;
981 spin_unlock(&ifa->lock);
982 }
983
984 return action;
985}
986
987static void
988cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long expires, bool del_rt)
989{
990 struct rt6_info *rt;
991
992 rt = addrconf_get_prefix_route(&ifp->addr,
993 ifp->prefix_len,
994 ifp->idev->dev,
995 0, RTF_GATEWAY | RTF_DEFAULT);
996 if (rt) {
997 if (del_rt)
998 ip6_del_rt(rt);
999 else {
1000 if (!(rt->rt6i_flags & RTF_EXPIRES))
1001 rt6_set_expires(rt, expires);
1002 ip6_rt_put(rt);
1003 }
1004 }
1005}
1006
1007
1da177e4
LT		 1008/* This function wants to get referenced ifp and releases it before return */
1009
1010static void ipv6_del_addr(struct inet6_ifaddr *ifp)
1011{
4c5ff6a6 1012 int state;
5b84efec
TH		 1013 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_NOP;
1014 unsigned long expires;
1da177e4 1015
c15b1cca
HFS		 1016 ASSERT_RTNL();
1017
8e8e676d 1018 spin_lock_bh(&ifp->lock);
4c5ff6a6 1019 state = ifp->state;
e9d3e084 1020 ifp->state = INET6_IFADDR_STATE_DEAD;
8e8e676d 1021 spin_unlock_bh(&ifp->lock);
4c5ff6a6
HX		 1022
1023 if (state == INET6_IFADDR_STATE_DEAD)
1024 goto out;
1da177e4 1025
5c578aed 1026 spin_lock_bh(&addrconf_hash_lock);
1027 hlist_del_init_rcu(&ifp->addr_lst);
5c578aed 1028 spin_unlock_bh(&addrconf_hash_lock);
1da177e4 1029
5b84efec 1030 write_lock_bh(&ifp->idev->lock);
5d9efa7e 1031
1da177e4 1032 if (ifp->flags&IFA_F_TEMPORARY) {
372e6c8f 1033 list_del(&ifp->tmp_list);
1034 if (ifp->ifpub) {
1035 in6_ifa_put(ifp->ifpub);
1036 ifp->ifpub = NULL;
1da177e4 1037 }
372e6c8f 1038 __in6_ifa_put(ifp);
1da177e4 1039 }
1da177e4 1040
5b84efec
TH		 1041 if (ifp->flags & IFA_F_PERMANENT && !(ifp->flags & IFA_F_NOPREFIXROUTE))
1042 action = check_cleanup_prefix_route(ifp, &expires);
502a2ffd 1043
5b84efec
TH		 1044 list_del_init(&ifp->if_list);
1045 __in6_ifa_put(ifp);
1046
1047 write_unlock_bh(&ifp->idev->lock);
1da177e4 1048
c15b1cca 1049 addrconf_del_dad_work(ifp);
b2238566 1050
1da177e4
LT		 1051 ipv6_ifa_notify(RTM_DELADDR, ifp);
1052
f88c91dd 1053 inet6addr_notifier_call_chain(NETDEV_DOWN, ifp);
1da177e4 1054
5b84efec
TH		 1055 if (action != CLEANUP_PREFIX_RT_NOP) {
1056 cleanup_prefix_route(ifp, expires,
1057 action == CLEANUP_PREFIX_RT_DEL);
1da177e4
LT		 1058 }
1059
c3968a85
DW		 1060 /* clean up prefsrc entries */
1061 rt6_remove_prefsrc(ifp);
4c5ff6a6 1062out:
1da177e4
LT		 1063 in6_ifa_put(ifp);
1064}
1065
1da177e4
LT		 1066static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
1067{
1068 struct inet6_dev *idev = ifp->idev;
1069 struct in6_addr addr, *tmpaddr;
76f793e3 1070 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_tstamp, age;
eac55bf9 1071 unsigned long regen_advance;
1da177e4
LT		 1072 int tmp_plen;
1073 int ret = 0;
95c385b4 1074 u32 addr_flags;
76f793e3 1075 unsigned long now = jiffies;
1da177e4 1076
53bd6749 1077 write_lock_bh(&idev->lock);
1da177e4
LT		 1078 if (ift) {
1079 spin_lock_bh(&ift->lock);
1080 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
1081 spin_unlock_bh(&ift->lock);
1082 tmpaddr = &addr;
1083 } else {
1084 tmpaddr = NULL;
1085 }
1086retry:
1087 in6_dev_hold(idev);
1088 if (idev->cnf.use_tempaddr <= 0) {
53bd6749 1089 write_unlock_bh(&idev->lock);
f3213831 1090 pr_info("%s: use_tempaddr is disabled\n", __func__);
1da177e4
LT		 1091 in6_dev_put(idev);
1092 ret = -1;
1093 goto out;
1094 }
1095 spin_lock_bh(&ifp->lock);
1096 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
1097 idev->cnf.use_tempaddr = -1; /*XXX*/
1098 spin_unlock_bh(&ifp->lock);
53bd6749 1099 write_unlock_bh(&idev->lock);
f3213831
JP		 1100 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n",
1101 __func__);
1da177e4
LT		 1102 in6_dev_put(idev);
1103 ret = -1;
1104 goto out;
1105 }
1106 in6_ifa_hold(ifp);
1107 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
eb7e0575 1108 __ipv6_try_regen_rndid(idev, tmpaddr);
1da177e4 1109 memcpy(&addr.s6_addr[8], idev->rndid, 8);
76f793e3 1110 age = (now - ifp->tstamp) / HZ;
1da177e4
LT		 1111 tmp_valid_lft = min_t(__u32,
1112 ifp->valid_lft,
7a876b0e 1113 idev->cnf.temp_valid_lft + age);
1ab1457c
YH		 1114 tmp_prefered_lft = min_t(__u32,
1115 ifp->prefered_lft,
7a876b0e 1116 idev->cnf.temp_prefered_lft + age -
784e2710 1117 idev->cnf.max_desync_factor);
1da177e4 1118 tmp_plen = ifp->prefix_len;
1da177e4
LT		 1119 tmp_tstamp = ifp->tstamp;
1120 spin_unlock_bh(&ifp->lock);
1121
eac55bf9 1122 regen_advance = idev->cnf.regen_max_retry *
67ba4152
IM		 1123 idev->cnf.dad_transmits *
1124 NEIGH_VAR(idev->nd_parms, RETRANS_TIME) / HZ;
53bd6749 1125 write_unlock_bh(&idev->lock);
95c385b4 1126
eac55bf9
BB		 1127 /* A temporary address is created only if this calculated Preferred
1128 * Lifetime is greater than REGEN_ADVANCE time units. In particular,
1129 * an implementation must not create a temporary address with a zero
1130 * Preferred Lifetime.
ecab6701
HK		 1131 * Use age calculation as in addrconf_verify to avoid unnecessary
1132 * temporary addresses being generated.
eac55bf9 1133 */
ecab6701
HK		 1134 age = (now - tmp_tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
1135 if (tmp_prefered_lft <= regen_advance + age) {
eac55bf9
BB		 1136 in6_ifa_put(ifp);
1137 in6_dev_put(idev);
1138 ret = -1;
1139 goto out;
1140 }
1141
95c385b4
NH		 1142 addr_flags = IFA_F_TEMPORARY;
1143 /* set in addrconf_prefix_rcv() */
1144 if (ifp->flags & IFA_F_OPTIMISTIC)
1145 addr_flags |= IFA_F_OPTIMISTIC;
1146
4b08a8f1
HFS		 1147 ift = ipv6_add_addr(idev, &addr, NULL, tmp_plen,
1148 ipv6_addr_scope(&addr), addr_flags,
1149 tmp_valid_lft, tmp_prefered_lft);
1150 if (IS_ERR(ift)) {
1da177e4
LT		 1151 in6_ifa_put(ifp);
1152 in6_dev_put(idev);
f3213831 1153 pr_info("%s: retry temporary address regeneration\n", __func__);
1da177e4 1154 tmpaddr = &addr;
53bd6749 1155 write_lock_bh(&idev->lock);
1da177e4
LT		 1156 goto retry;
1157 }
1158
1159 spin_lock_bh(&ift->lock);
1160 ift->ifpub = ifp;
76f793e3 1161 ift->cstamp = now;
1da177e4
LT		 1162 ift->tstamp = tmp_tstamp;
1163 spin_unlock_bh(&ift->lock);
1164
cf22f9a2 1165 addrconf_dad_start(ift);
1da177e4
LT		 1166 in6_ifa_put(ift);
1167 in6_dev_put(idev);
1168out:
1169 return ret;
1170}
1da177e4
LT		 1171
1172/*
072047e4 1173 * Choose an appropriate source address (RFC3484)
1da177e4 1174 */
a9b05723
YH		 1175enum {
1176 IPV6_SADDR_RULE_INIT = 0,
1177 IPV6_SADDR_RULE_LOCAL,
1178 IPV6_SADDR_RULE_SCOPE,
1179 IPV6_SADDR_RULE_PREFERRED,
1180#ifdef CONFIG_IPV6_MIP6
1181 IPV6_SADDR_RULE_HOA,
1182#endif
1183 IPV6_SADDR_RULE_OIF,
1184 IPV6_SADDR_RULE_LABEL,
a9b05723 1185 IPV6_SADDR_RULE_PRIVACY,
a9b05723
YH		 1186 IPV6_SADDR_RULE_ORCHID,
1187 IPV6_SADDR_RULE_PREFIX,
7fd2561e
EK		 1188#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1189 IPV6_SADDR_RULE_NOT_OPTIMISTIC,
1190#endif
a9b05723
YH		 1191 IPV6_SADDR_RULE_MAX
1192};
1193
072047e4 1194struct ipv6_saddr_score {
a9b05723
YH		 1195 int rule;
1196 int addr_type;
1197 struct inet6_ifaddr *ifa;
1198 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
1199 int scopedist;
1200 int matchlen;
072047e4
YH		 1201};
1202
a9b05723 1203struct ipv6_saddr_dst {
9acd9f3a 1204 const struct in6_addr *addr;
a9b05723
YH		 1205 int ifindex;
1206 int scope;
1207 int label;
7cbca67c 1208 unsigned int prefs;
a9b05723 1209};
072047e4 1210
b6f99a21 1211static inline int ipv6_saddr_preferred(int type)
1da177e4 1212{
45bb0060 1213 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
072047e4
YH		 1214 return 1;
1215 return 0;
1da177e4
LT		 1216}
1217
7fd2561e
EK		 1218static inline bool ipv6_use_optimistic_addr(struct inet6_dev *idev)
1219{
1220#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1221 return idev && idev->cnf.optimistic_dad && idev->cnf.use_optimistic;
1222#else
1223 return false;
1224#endif
1225}
1226
3de23255
BT		 1227static int ipv6_get_saddr_eval(struct net *net,
1228 struct ipv6_saddr_score *score,
a9b05723
YH		 1229 struct ipv6_saddr_dst *dst,
1230 int i)
1231{
1232 int ret;
1233
1234 if (i <= score->rule) {
1235 switch (i) {
1236 case IPV6_SADDR_RULE_SCOPE:
1237 ret = score->scopedist;
1238 break;
1239 case IPV6_SADDR_RULE_PREFIX:
1240 ret = score->matchlen;
1241 break;
1242 default:
1243 ret = !!test_bit(i, score->scorebits);
1244 }
1245 goto out;
1246 }
1247
1248 switch (i) {
1249 case IPV6_SADDR_RULE_INIT:
1250 /* Rule 0: remember if hiscore is not ready yet */
1251 ret = !!score->ifa;
1252 break;
1253 case IPV6_SADDR_RULE_LOCAL:
1254 /* Rule 1: Prefer same address */
1255 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1256 break;
1257 case IPV6_SADDR_RULE_SCOPE:
1258 /* Rule 2: Prefer appropriate scope
1259 *
1260 * ret
1261 * ^
1262 * -1 | d 15
1263 * ---+--+-+---> scope
1264 * |
1265 * | d is scope of the destination.
1266 * B-d | \
1267 * | \ <- smaller scope is better if
db9c7c39 1268 * B-15 | \ if scope is enough for destination.
a9b05723
YH		 1269 * | ret = B - scope (-1 <= scope >= d <= 15).
1270 * d-C-1 | /
1271 * |/ <- greater is better
1272 * -C / if scope is not enough for destination.
1273 * /| ret = scope - C (-1 <= d < scope <= 15).
1274 *
1275 * d - C - 1 < B -15 (for all -1 <= d <= 15).
1276 * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1277 * Assume B = 0 and we get C > 29.
1278 */
1279 ret = __ipv6_addr_src_scope(score->addr_type);
1280 if (ret >= dst->scope)
1281 ret = -ret;
1282 else
1283 ret -= 128; /* 30 is enough */
1284 score->scopedist = ret;
1285 break;
1286 case IPV6_SADDR_RULE_PREFERRED:
7fd2561e 1287 {
a9b05723 1288 /* Rule 3: Avoid deprecated and optimistic addresses */
7fd2561e
EK		 1289 u8 avoid = IFA_F_DEPRECATED;
1290
1291 if (!ipv6_use_optimistic_addr(score->ifa->idev))
1292 avoid |= IFA_F_OPTIMISTIC;
a9b05723 1293 ret = ipv6_saddr_preferred(score->addr_type) ||
7fd2561e 1294 !(score->ifa->flags & avoid);
a9b05723 1295 break;
7fd2561e 1296 }
a9b05723
YH		 1297#ifdef CONFIG_IPV6_MIP6
1298 case IPV6_SADDR_RULE_HOA:
7cbca67c 1299 {
a9b05723 1300 /* Rule 4: Prefer home address */
7cbca67c
YH		 1301 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1302 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
a9b05723 1303 break;
7cbca67c 1304 }
a9b05723
YH		 1305#endif
1306 case IPV6_SADDR_RULE_OIF:
1307 /* Rule 5: Prefer outgoing interface */
1308 ret = (!dst->ifindex ||
1309 dst->ifindex == score->ifa->idev->dev->ifindex);
1310 break;
1311 case IPV6_SADDR_RULE_LABEL:
1312 /* Rule 6: Prefer matching label */
3de23255
BT		 1313 ret = ipv6_addr_label(net,
1314 &score->ifa->addr, score->addr_type,
a9b05723
YH		 1315 score->ifa->idev->dev->ifindex) == dst->label;
1316 break;
a9b05723 1317 case IPV6_SADDR_RULE_PRIVACY:
7cbca67c 1318 {
a9b05723 1319 /* Rule 7: Prefer public address
25985edc 1320 * Note: prefer temporary address if use_tempaddr >= 2
a9b05723 1321 */
7cbca67c
YH		 1322 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1323 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1324 score->ifa->idev->cnf.use_tempaddr >= 2;
1325 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
a9b05723 1326 break;
7cbca67c 1327 }
a9b05723
YH		 1328 case IPV6_SADDR_RULE_ORCHID:
1329 /* Rule 8-: Prefer ORCHID vs ORCHID or
1330 * non-ORCHID vs non-ORCHID
1331 */
1332 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1333 ipv6_addr_orchid(dst->addr));
1334 break;
1335 case IPV6_SADDR_RULE_PREFIX:
1336 /* Rule 8: Use longest matching prefix */
91b4b04f
YH		 1337 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr);
1338 if (ret > score->ifa->prefix_len)
1339 ret = score->ifa->prefix_len;
1340 score->matchlen = ret;
a9b05723 1341 break;
7fd2561e
EK		 1342#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1343 case IPV6_SADDR_RULE_NOT_OPTIMISTIC:
1344 /* Optimistic addresses still have lower precedence than other
1345 * preferred addresses.
1346 */
1347 ret = !(score->ifa->flags & IFA_F_OPTIMISTIC);
1348 break;
1349#endif
a9b05723
YH		 1350 default:
1351 ret = 0;
1352 }
1353
1354 if (ret)
1355 __set_bit(i, score->scorebits);
1356 score->rule = i;
1357out:
1358 return ret;
1359}
1360
b3f644fc 1361int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev,
9acd9f3a 1362 const struct in6_addr *daddr, unsigned int prefs,
7cbca67c 1363 struct in6_addr *saddr)
1da177e4 1364{
a9b05723
YH		 1365 struct ipv6_saddr_score scores[2],
1366 *score = &scores[0], *hiscore = &scores[1];
a9b05723 1367 struct ipv6_saddr_dst dst;
072047e4 1368 struct net_device *dev;
a9b05723 1369 int dst_type;
1da177e4 1370
a9b05723
YH		 1371 dst_type = __ipv6_addr_type(daddr);
1372 dst.addr = daddr;
1373 dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1374 dst.scope = __ipv6_addr_src_scope(dst_type);
3de23255 1375 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
7cbca67c 1376 dst.prefs = prefs;
a9b05723
YH		 1377
1378 hiscore->rule = -1;
1379 hiscore->ifa = NULL;
1da177e4 1380
8814c4b5 1381 rcu_read_lock();
1da177e4 1382
c6d14c84 1383 for_each_netdev_rcu(net, dev) {
072047e4 1384 struct inet6_dev *idev;
072047e4 1385
a9b05723 1386 /* Candidate Source Address (section 4)
072047e4
YH		 1387 * - multicast and link-local destination address,
1388 * the set of candidate source address MUST only
1389 * include addresses assigned to interfaces
1390 * belonging to the same link as the outgoing
1391 * interface.
1392 * (- For site-local destination addresses, the
1393 * set of candidate source addresses MUST only
1394 * include addresses assigned to interfaces
1395 * belonging to the same site as the outgoing
1396 * interface.)
1397 */
a9b05723
YH		 1398 if (((dst_type & IPV6_ADDR_MULTICAST) ||
1399 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL) &&
1400 dst.ifindex && dev->ifindex != dst.ifindex)
072047e4 1401 continue;
1da177e4 1402
1da177e4 1403 idev = __in6_dev_get(dev);
072047e4
YH		 1404 if (!idev)
1405 continue;
1406
1407 read_lock_bh(&idev->lock);
502a2ffd 1408 list_for_each_entry(score->ifa, &idev->addr_list, if_list) {
a9b05723 1409 int i;
072047e4 1410
a9b05723 1411 /*
6b3ae80a
YH		 1412 * - Tentative Address (RFC2462 section 5.4)
1413 * - A tentative address is not considered
1414 * "assigned to an interface" in the traditional
95c385b4 1415 * sense, unless it is also flagged as optimistic.
6b3ae80a 1416 * - Candidate Source Address (section 4)
072047e4
YH		 1417 * - In any case, anycast addresses, multicast
1418 * addresses, and the unspecified address MUST
1419 * NOT be included in a candidate set.
1420 */
a9b05723
YH		 1421 if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1422 (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
6b3ae80a 1423 continue;
a9b05723
YH		 1424
1425 score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1426
1427 if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1428 score->addr_type & IPV6_ADDR_MULTICAST)) {
ba7a46f1
JP		 1429 net_dbg_ratelimited("ADDRCONF: unspecified / multicast address assigned as unicast address on %s",
1430 dev->name);
072047e4
YH		 1431 continue;
1432 }
1433
a9b05723
YH		 1434 score->rule = -1;
1435 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1436
1437 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1438 int minihiscore, miniscore;
1439
3de23255
BT		 1440 minihiscore = ipv6_get_saddr_eval(net, hiscore, &dst, i);
1441 miniscore = ipv6_get_saddr_eval(net, score, &dst, i);
a9b05723
YH		 1442
1443 if (minihiscore > miniscore) {
1444 if (i == IPV6_SADDR_RULE_SCOPE &&
1445 score->scopedist > 0) {
1446 /*
1447 * special case:
1448 * each remaining entry
1449 * has too small (not enough)
1450 * scope, because ifa entries
1451 * are sorted by their scope
1452 * values.
1453 */
1454 goto try_nextdev;
1455 }
1456 break;
1457 } else if (minihiscore < miniscore) {
a9b05723
YH		 1458 if (hiscore->ifa)
1459 in6_ifa_put(hiscore->ifa);
1460
1461 in6_ifa_hold(score->ifa);
1462
a0bffffc 1463 swap(hiscore, score);
a9b05723
YH		 1464
1465 /* restore our iterator */
1466 score->ifa = hiscore->ifa;
1467
1468 break;
1da177e4 1469 }
072047e4 1470 }
1da177e4 1471 }
a9b05723 1472try_nextdev:
072047e4 1473 read_unlock_bh(&idev->lock);
1da177e4 1474 }
8814c4b5 1475 rcu_read_unlock();
1da177e4 1476
a9b05723 1477 if (!hiscore->ifa)
072047e4 1478 return -EADDRNOTAVAIL;
1ab1457c 1479
4e3fd7a0 1480 *saddr = hiscore->ifa->addr;
a9b05723 1481 in6_ifa_put(hiscore->ifa);
072047e4 1482 return 0;
1da177e4 1483}
5e5f3f0f 1484EXPORT_SYMBOL(ipv6_dev_get_saddr);
1da177e4 1485
8965779d 1486int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr,
479840ff 1487 u32 banned_flags)
b7b1bfce
HFS		 1488{
1489 struct inet6_ifaddr *ifp;
1490 int err = -EADDRNOTAVAIL;
1491
602582ca
HFS		 1492 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
1493 if (ifp->scope > IFA_LINK)
1494 break;
b7b1bfce
HFS		 1495 if (ifp->scope == IFA_LINK &&
1496 !(ifp->flags & banned_flags)) {
1497 *addr = ifp->addr;
1498 err = 0;
1499 break;
1500 }
1501 }
1502 return err;
1503}
1504
95c385b4 1505int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
479840ff 1506 u32 banned_flags)
1da177e4
LT		 1507{
1508 struct inet6_dev *idev;
1509 int err = -EADDRNOTAVAIL;
1510
8814c4b5 1511 rcu_read_lock();
e21e8467
SH		 1512 idev = __in6_dev_get(dev);
1513 if (idev) {
1da177e4 1514 read_lock_bh(&idev->lock);
b7b1bfce 1515 err = __ipv6_get_lladdr(idev, addr, banned_flags);
1da177e4
LT		 1516 read_unlock_bh(&idev->lock);
1517 }
8814c4b5 1518 rcu_read_unlock();
1da177e4
LT		 1519 return err;
1520}
1521
1522static int ipv6_count_addresses(struct inet6_dev *idev)
1523{
1524 int cnt = 0;
1525 struct inet6_ifaddr *ifp;
1526
1527 read_lock_bh(&idev->lock);
502a2ffd 1528 list_for_each_entry(ifp, &idev->addr_list, if_list)
1da177e4
LT		 1529 cnt++;
1530 read_unlock_bh(&idev->lock);
1531 return cnt;
1532}
1533
b71d1d42 1534int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
2a7851bf 1535 const struct net_device *dev, int strict)
c58da4c6
EK		 1536{
1537 return ipv6_chk_addr_and_flags(net, addr, dev, strict, IFA_F_TENTATIVE);
1538}
1539EXPORT_SYMBOL(ipv6_chk_addr);
1540
1541int ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr,
1542 const struct net_device *dev, int strict,
1543 u32 banned_flags)
1da177e4 1544{
eedf042a 1545 struct inet6_ifaddr *ifp;
ddbe5032 1546 unsigned int hash = inet6_addr_hash(addr);
c58da4c6 1547 u32 ifp_flags;
1da177e4 1548
5c578aed 1549 rcu_read_lock_bh();
b67bfe0d 1550 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
878628fb 1551 if (!net_eq(dev_net(ifp->idev->dev), net))
bfeade08 1552 continue;
c58da4c6
EK		 1553 /* Decouple optimistic from tentative for evaluation here.
1554 * Ban optimistic addresses explicitly, when required.
1555 */
1556 ifp_flags = (ifp->flags&IFA_F_OPTIMISTIC)
1557 ? (ifp->flags&~IFA_F_TENTATIVE)
1558 : ifp->flags;
1da177e4 1559 if (ipv6_addr_equal(&ifp->addr, addr) &&
c58da4c6 1560 !(ifp_flags&banned_flags) &&
eedf042a
SH		 1561 (dev == NULL || ifp->idev->dev == dev ||
1562 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) {
1563 rcu_read_unlock_bh();
1564 return 1;
1da177e4
LT		 1565 }
1566 }
5c578aed 1567
eedf042a
SH		 1568 rcu_read_unlock_bh();
1569 return 0;
1da177e4 1570}
c58da4c6 1571EXPORT_SYMBOL(ipv6_chk_addr_and_flags);
7159039a 1572
3e81c6da
DM		 1573static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1574 struct net_device *dev)
1da177e4 1575{
ddbe5032 1576 unsigned int hash = inet6_addr_hash(addr);
c2e21293 1577 struct inet6_ifaddr *ifp;
1da177e4 1578
b67bfe0d 1579 hlist_for_each_entry(ifp, &inet6_addr_lst[hash], addr_lst) {
878628fb 1580 if (!net_eq(dev_net(ifp->idev->dev), net))
06bfe655 1581 continue;
1da177e4
LT		 1582 if (ipv6_addr_equal(&ifp->addr, addr)) {
1583 if (dev == NULL || ifp->idev->dev == dev)
3e81c6da 1584 return true;
1da177e4
LT		 1585 }
1586 }
3e81c6da 1587 return false;
1da177e4
LT		 1588}
1589
7df37ff3
CB		 1590/* Compares an address/prefix_len with addresses on device @dev.
1591 * If one is found it returns true.
1592 */
1593bool ipv6_chk_custom_prefix(const struct in6_addr *addr,
1594 const unsigned int prefix_len, struct net_device *dev)
1595{
1596 struct inet6_dev *idev;
1597 struct inet6_ifaddr *ifa;
1598 bool ret = false;
1599
1600 rcu_read_lock();
1601 idev = __in6_dev_get(dev);
1602 if (idev) {
1603 read_lock_bh(&idev->lock);
1604 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1605 ret = ipv6_prefix_equal(addr, &ifa->addr, prefix_len);
1606 if (ret)
1607 break;
1608 }
1609 read_unlock_bh(&idev->lock);
1610 }
1611 rcu_read_unlock();
1612
1613 return ret;
1614}
1615EXPORT_SYMBOL(ipv6_chk_custom_prefix);
1616
b71d1d42 1617int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev)
52eeeb84
YH		 1618{
1619 struct inet6_dev *idev;
1620 struct inet6_ifaddr *ifa;
1621 int onlink;
1622
1623 onlink = 0;
1624 rcu_read_lock();
1625 idev = __in6_dev_get(dev);
1626 if (idev) {
1627 read_lock_bh(&idev->lock);
502a2ffd 1628 list_for_each_entry(ifa, &idev->addr_list, if_list) {
52eeeb84
YH		 1629 onlink = ipv6_prefix_equal(addr, &ifa->addr,
1630 ifa->prefix_len);
1631 if (onlink)
1632 break;
1633 }
1634 read_unlock_bh(&idev->lock);
1635 }
1636 rcu_read_unlock();
1637 return onlink;
1638}
52eeeb84
YH		 1639EXPORT_SYMBOL(ipv6_chk_prefix);
1640
9acd9f3a 1641struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1cab3da6 1642 struct net_device *dev, int strict)
1da177e4 1643{
b79d1d54 1644 struct inet6_ifaddr *ifp, *result = NULL;
ddbe5032 1645 unsigned int hash = inet6_addr_hash(addr);
1da177e4 1646
5c578aed 1647 rcu_read_lock_bh();
b67bfe0d 1648 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
878628fb 1649 if (!net_eq(dev_net(ifp->idev->dev), net))
1cab3da6 1650 continue;
1da177e4
LT		 1651 if (ipv6_addr_equal(&ifp->addr, addr)) {
1652 if (dev == NULL || ifp->idev->dev == dev ||
1653 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
b79d1d54 1654 result = ifp;
1da177e4
LT		 1655 in6_ifa_hold(ifp);
1656 break;
1657 }
1658 }
1659 }
5c578aed 1660 rcu_read_unlock_bh();
1da177e4 1661
b79d1d54 1662 return result;
1da177e4
LT		 1663}
1664
1da177e4
LT		 1665/* Gets referenced address, destroys ifaddr */
1666
cc411d0b 1667static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
1da177e4 1668{
1da177e4
LT		 1669 if (ifp->flags&IFA_F_PERMANENT) {
1670 spin_lock_bh(&ifp->lock);
c15b1cca 1671 addrconf_del_dad_work(ifp);
1da177e4 1672 ifp->flags |= IFA_F_TENTATIVE;
cc411d0b
BH		 1673 if (dad_failed)
1674 ifp->flags |= IFA_F_DADFAILED;
1da177e4 1675 spin_unlock_bh(&ifp->lock);
e2577a06
HX		 1676 if (dad_failed)
1677 ipv6_ifa_notify(0, ifp);
1da177e4 1678 in6_ifa_put(ifp);
1da177e4
LT		 1679 } else if (ifp->flags&IFA_F_TEMPORARY) {
1680 struct inet6_ifaddr *ifpub;
1681 spin_lock_bh(&ifp->lock);
1682 ifpub = ifp->ifpub;
1683 if (ifpub) {
1684 in6_ifa_hold(ifpub);
1685 spin_unlock_bh(&ifp->lock);
1686 ipv6_create_tempaddr(ifpub, ifp);
1687 in6_ifa_put(ifpub);
1688 } else {
1689 spin_unlock_bh(&ifp->lock);
1690 }
1691 ipv6_del_addr(ifp);
c15b1cca 1692 } else {
1da177e4 1693 ipv6_del_addr(ifp);
c15b1cca 1694 }
1da177e4
LT		 1695}
1696
f2344a13
HX		 1697static int addrconf_dad_end(struct inet6_ifaddr *ifp)
1698{
1699 int err = -ENOENT;
1700
8e8e676d 1701 spin_lock_bh(&ifp->lock);
f2344a13
HX		 1702 if (ifp->state == INET6_IFADDR_STATE_DAD) {
1703 ifp->state = INET6_IFADDR_STATE_POSTDAD;
1704 err = 0;
1705 }
8e8e676d 1706 spin_unlock_bh(&ifp->lock);
f2344a13
HX		 1707
1708 return err;
1709}
1710
3c21edbd
YH		 1711void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1712{
1b34be74 1713 struct inet6_dev *idev = ifp->idev;
9bdd8d40 1714
853dc2e0
UB		 1715 if (addrconf_dad_end(ifp)) {
1716 in6_ifa_put(ifp);
f2344a13 1717 return;
853dc2e0 1718 }
f2344a13 1719
e87cc472
JP		 1720 net_info_ratelimited("%s: IPv6 duplicate address %pI6c detected!\n",
1721 ifp->idev->dev->name, &ifp->addr);
9bdd8d40 1722
1b34be74
YH		 1723 if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6) {
1724 struct in6_addr addr;
1725
1726 addr.s6_addr32[0] = htonl(0xfe800000);
1727 addr.s6_addr32[1] = 0;
1728
1729 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
1730 ipv6_addr_equal(&ifp->addr, &addr)) {
1731 /* DAD failed for link-local based on MAC address */
1732 idev->cnf.disable_ipv6 = 1;
9bdd8d40 1733
f3213831 1734 pr_info("%s: IPv6 being disabled!\n",
9bdd8d40 1735 ifp->idev->dev->name);
1b34be74
YH		 1736 }
1737 }
1738
8e8e676d 1739 spin_lock_bh(&ifp->lock);
c15b1cca
HFS		 1740 /* transition from _POSTDAD to _ERRDAD */
1741 ifp->state = INET6_IFADDR_STATE_ERRDAD;
8e8e676d 1742 spin_unlock_bh(&ifp->lock);
c15b1cca
HFS		 1743
1744 addrconf_mod_dad_work(ifp, 0);
3c21edbd 1745}
1da177e4 1746
a9ed4a29
SD		 1747/* Join to solicited addr multicast group.
1748 * caller must hold RTNL */
b71d1d42 1749void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr)
1da177e4
LT		 1750{
1751 struct in6_addr maddr;
1752
1753 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1754 return;
1755
1756 addrconf_addr_solict_mult(addr, &maddr);
1757 ipv6_dev_mc_inc(dev, &maddr);
1758}
1759
a9ed4a29 1760/* caller must hold RTNL */
b71d1d42 1761void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr)
1da177e4
LT		 1762{
1763 struct in6_addr maddr;
1764
1765 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1766 return;
1767
1768 addrconf_addr_solict_mult(addr, &maddr);
1769 __ipv6_dev_mc_dec(idev, &maddr);
1770}
1771
a9ed4a29 1772/* caller must hold RTNL */
20380731 1773static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1da177e4
LT		 1774{
1775 struct in6_addr addr;
c15b1cca 1776
88ad3149 1777 if (ifp->prefix_len >= 127) /* RFC 6164 */
2bda8a0c 1778 return;
1da177e4
LT		 1779 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1780 if (ipv6_addr_any(&addr))
1781 return;
013b4d90 1782 __ipv6_dev_ac_inc(ifp->idev, &addr);
1da177e4
LT		 1783}
1784
a9ed4a29 1785/* caller must hold RTNL */
20380731 1786static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1da177e4
LT		 1787{
1788 struct in6_addr addr;
c15b1cca 1789
88ad3149 1790 if (ifp->prefix_len >= 127) /* RFC 6164 */
32019e65 1791 return;
1da177e4
LT		 1792 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1793 if (ipv6_addr_any(&addr))
1794 return;
1795 __ipv6_dev_ac_dec(ifp->idev, &addr);
1796}
1797
073a8e0e
YH		 1798static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
1799{
1800 if (dev->addr_len != ETH_ALEN)
1801 return -1;
1802 memcpy(eui, dev->dev_addr, 3);
1803 memcpy(eui + 5, dev->dev_addr + 3, 3);
1804
1805 /*
1806 * The zSeries OSA network cards can be shared among various
1807 * OS instances, but the OSA cards have only one MAC address.
1808 * This leads to duplicate address conflicts in conjunction
1809 * with IPv6 if more than one instance uses the same card.
1810 *
1811 * The driver for these cards can deliver a unique 16-bit
1812 * identifier for each instance sharing the same card. It is
1813 * placed instead of 0xFFFE in the interface identifier. The
1814 * "u" bit of the interface identifier is not inverted in this
1815 * case. Hence the resulting interface identifier has local
1816 * scope according to RFC2373.
1817 */
1818 if (dev->dev_id) {
1819 eui[3] = (dev->dev_id >> 8) & 0xFF;
1820 eui[4] = dev->dev_id & 0xFF;
1821 } else {
1822 eui[3] = 0xFF;
1823 eui[4] = 0xFE;
1824 eui[0] ^= 2;
1825 }
1826 return 0;
1827}
1828
06a4c1c5 1829static int addrconf_ifid_eui64(u8 *eui, struct net_device *dev)
1830{
1831 if (dev->addr_len != IEEE802154_ADDR_LEN)
1832 return -1;
1833 memcpy(eui, dev->dev_addr, 8);
5e98a36e 1834 eui[0] ^= 2;
06a4c1c5 1835 return 0;
1836}
1837
cb6bf355
YH		 1838static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev)
1839{
1840 union fwnet_hwaddr *ha;
1841
1842 if (dev->addr_len != FWNET_ALEN)
1843 return -1;
1844
1845 ha = (union fwnet_hwaddr *)dev->dev_addr;
1846
1847 memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id));
1848 eui[0] ^= 2;
1849 return 0;
1850}
1851
073a8e0e
YH		 1852static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1853{
1854 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1855 if (dev->addr_len != ARCNET_ALEN)
1856 return -1;
1857 memset(eui, 0, 7);
8e5e8f30 1858 eui[7] = *(u8 *)dev->dev_addr;
073a8e0e
YH		 1859 return 0;
1860}
1861
1862static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1863{
1864 if (dev->addr_len != INFINIBAND_ALEN)
1865 return -1;
1866 memcpy(eui, dev->dev_addr + 12, 8);
1867 eui[0] |= 2;
1868 return 0;
1869}
1870
c61393ea 1871static int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
dfd982ba 1872{
9af28511
SH		 1873 if (addr == 0)
1874 return -1;
dfd982ba
YH		 1875 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
1876 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
1877 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
1878 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
1879 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
1880 ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
1881 eui[1] = 0;
1882 eui[2] = 0x5E;
1883 eui[3] = 0xFE;
1884 memcpy(eui + 4, &addr, 4);
1885 return 0;
1886}
dfd982ba
YH		 1887
1888static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
1889{
1890 if (dev->priv_flags & IFF_ISATAP)
1891 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1892 return -1;
1893}
1894
aee80b54 1895static int addrconf_ifid_gre(u8 *eui, struct net_device *dev)
1896{
1897 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1898}
1899
e837735e
ND		 1900static int addrconf_ifid_ip6tnl(u8 *eui, struct net_device *dev)
1901{
1902 memcpy(eui, dev->perm_addr, 3);
1903 memcpy(eui + 5, dev->perm_addr + 3, 3);
1904 eui[3] = 0xFF;
1905 eui[4] = 0xFE;
1906 eui[0] ^= 2;
1907 return 0;
1908}
1909
1da177e4
LT		 1910static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1911{
1912 switch (dev->type) {
1913 case ARPHRD_ETHER:
1914 case ARPHRD_FDDI:
073a8e0e 1915 return addrconf_ifid_eui48(eui, dev);
1da177e4 1916 case ARPHRD_ARCNET:
073a8e0e 1917 return addrconf_ifid_arcnet(eui, dev);
1da177e4 1918 case ARPHRD_INFINIBAND:
073a8e0e 1919 return addrconf_ifid_infiniband(eui, dev);
c7dc89c0 1920 case ARPHRD_SIT:
dfd982ba 1921 return addrconf_ifid_sit(eui, dev);
aee80b54 1922 case ARPHRD_IPGRE:
1923 return addrconf_ifid_gre(eui, dev);
e74bccb8 1924 case ARPHRD_6LOWPAN:
06a4c1c5 1925 case ARPHRD_IEEE802154:
1926 return addrconf_ifid_eui64(eui, dev);
cb6bf355
YH		 1927 case ARPHRD_IEEE1394:
1928 return addrconf_ifid_ieee1394(eui, dev);
e837735e
ND		 1929 case ARPHRD_TUNNEL6:
1930 return addrconf_ifid_ip6tnl(eui, dev);
1da177e4
LT		 1931 }
1932 return -1;
1933}
1934
1935static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1936{
1937 int err = -1;
1938 struct inet6_ifaddr *ifp;
1939
1940 read_lock_bh(&idev->lock);
602582ca
HFS		 1941 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
1942 if (ifp->scope > IFA_LINK)
1943 break;
1da177e4
LT		 1944 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1945 memcpy(eui, ifp->addr.s6_addr+8, 8);
1946 err = 0;
1947 break;
1948 }
1949 }
1950 read_unlock_bh(&idev->lock);
1951 return err;
1952}
1953
1da177e4 1954/* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
eb7e0575 1955static void __ipv6_regen_rndid(struct inet6_dev *idev)
1da177e4 1956{
1da177e4 1957regen:
955189ef 1958 get_random_bytes(idev->rndid, sizeof(idev->rndid));
1da177e4 1959 idev->rndid[0] &= ~0x02;
1da177e4
LT		 1960
1961 /*
1962 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1963 * check if generated address is not inappropriate
1964 *
1965 * - Reserved subnet anycast (RFC 2526)
1966 * 11111101 11....11 1xxxxxxx
c7dc89c0 1967 * - ISATAP (RFC4214) 6.1
1da177e4
LT		 1968 * 00-00-5E-FE-xx-xx-xx-xx
1969 * - value 0
1970 * - XXX: already assigned to an address on the device
1971 */
1ab1457c 1972 if (idev->rndid[0] == 0xfd &&
1da177e4
LT		 1973 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1974 (idev->rndid[7]&0x80))
1975 goto regen;
1976 if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1977 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1978 goto regen;
1979 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1980 goto regen;
1981 }
1da177e4
LT		 1982}
1983
1984static void ipv6_regen_rndid(unsigned long data)
1985{
1986 struct inet6_dev *idev = (struct inet6_dev *) data;
1987 unsigned long expires;
1988
8814c4b5 1989 rcu_read_lock_bh();
1da177e4
LT		 1990 write_lock_bh(&idev->lock);
1991
1992 if (idev->dead)
1993 goto out;
1994
eb7e0575 1995 __ipv6_regen_rndid(idev);
1ab1457c 1996
1da177e4 1997 expires = jiffies +
1ab1457c 1998 idev->cnf.temp_prefered_lft * HZ -
1f9248e5
JP		 1999 idev->cnf.regen_max_retry * idev->cnf.dad_transmits *
2000 NEIGH_VAR(idev->nd_parms, RETRANS_TIME) -
784e2710 2001 idev->cnf.max_desync_factor * HZ;
1da177e4 2002 if (time_before(expires, jiffies)) {
f3213831
JP		 2003 pr_warn("%s: too short regeneration interval; timer disabled for %s\n",
2004 __func__, idev->dev->name);
1da177e4
LT		 2005 goto out;
2006 }
2007
2008 if (!mod_timer(&idev->regen_timer, expires))
2009 in6_dev_hold(idev);
2010
2011out:
2012 write_unlock_bh(&idev->lock);
8814c4b5 2013 rcu_read_unlock_bh();
1da177e4
LT		 2014 in6_dev_put(idev);
2015}
2016
eb7e0575 2017static void __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr)
8e5e8f30 2018{
1da177e4 2019 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
eb7e0575 2020 __ipv6_regen_rndid(idev);
1da177e4 2021}
1da177e4
LT		 2022
2023/*
2024 * Add prefix route.
2025 */
2026
2027static void
2028addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
e431b8c0 2029 unsigned long expires, u32 flags)
1da177e4 2030{
86872cb5
TG		 2031 struct fib6_config cfg = {
2032 .fc_table = RT6_TABLE_PREFIX,
2033 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2034 .fc_ifindex = dev->ifindex,
2035 .fc_expires = expires,
2036 .fc_dst_len = plen,
2037 .fc_flags = RTF_UP | flags,
c346dca1 2038 .fc_nlinfo.nl_net = dev_net(dev),
f410a1fb 2039 .fc_protocol = RTPROT_KERNEL,
86872cb5 2040 };
1da177e4 2041
4e3fd7a0 2042 cfg.fc_dst = *pfx;
1da177e4
LT		 2043
2044 /* Prevent useless cloning on PtP SIT.
2045 This thing is done here expecting that the whole
2046 class of non-broadcast devices need not cloning.
2047 */
07a93626 2048#if IS_ENABLED(CONFIG_IPV6_SIT)
86872cb5
TG		 2049 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
2050 cfg.fc_flags |= RTF_NONEXTHOP;
0be669bb 2051#endif
1da177e4 2052
86872cb5 2053 ip6_route_add(&cfg);
1da177e4
LT		 2054}
2055
14ef37b6
AH		 2056
2057static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
2058 int plen,
2059 const struct net_device *dev,
2060 u32 flags, u32 noflags)
2061{
2062 struct fib6_node *fn;
2063 struct rt6_info *rt = NULL;
2064 struct fib6_table *table;
2065
2066 table = fib6_get_table(dev_net(dev), RT6_TABLE_PREFIX);
2067 if (table == NULL)
2068 return NULL;
2069
5744dd9b 2070 read_lock_bh(&table->tb6_lock);
14ef37b6
AH		 2071 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0);
2072 if (!fn)
2073 goto out;
2074 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
d1918542 2075 if (rt->dst.dev->ifindex != dev->ifindex)
14ef37b6
AH		 2076 continue;
2077 if ((rt->rt6i_flags & flags) != flags)
2078 continue;
85da53bf 2079 if ((rt->rt6i_flags & noflags) != 0)
14ef37b6
AH		 2080 continue;
2081 dst_hold(&rt->dst);
2082 break;
2083 }
2084out:
5744dd9b 2085 read_unlock_bh(&table->tb6_lock);
14ef37b6
AH		 2086 return rt;
2087}
2088
2089
1da177e4
LT		 2090/* Create "default" multicast route to the interface */
2091
2092static void addrconf_add_mroute(struct net_device *dev)
2093{
86872cb5
TG		 2094 struct fib6_config cfg = {
2095 .fc_table = RT6_TABLE_LOCAL,
2096 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2097 .fc_ifindex = dev->ifindex,
2098 .fc_dst_len = 8,
2099 .fc_flags = RTF_UP,
c346dca1 2100 .fc_nlinfo.nl_net = dev_net(dev),
86872cb5
TG		 2101 };
2102
2103 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
2104
2105 ip6_route_add(&cfg);
1da177e4
LT		 2106}
2107
1da177e4
LT		 2108static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
2109{
2110 struct inet6_dev *idev;
2111
2112 ASSERT_RTNL();
2113
e21e8467
SH		 2114 idev = ipv6_find_idev(dev);
2115 if (!idev)
64e724f6
BH		 2116 return ERR_PTR(-ENOBUFS);
2117
2118 if (idev->cnf.disable_ipv6)
2119 return ERR_PTR(-EACCES);
1da177e4
LT		 2120
2121 /* Add default multicast route */
4af04aba
LW		 2122 if (!(dev->flags & IFF_LOOPBACK))
2123 addrconf_add_mroute(dev);
1da177e4 2124
1da177e4
LT		 2125 return idev;
2126}
2127
53bd6749
JP		 2128static void manage_tempaddrs(struct inet6_dev *idev,
2129 struct inet6_ifaddr *ifp,
2130 __u32 valid_lft, __u32 prefered_lft,
2131 bool create, unsigned long now)
2132{
2133 u32 flags;
2134 struct inet6_ifaddr *ift;
2135
2136 read_lock_bh(&idev->lock);
2137 /* update all temporary addresses in the list */
2138 list_for_each_entry(ift, &idev->tempaddr_list, tmp_list) {
2139 int age, max_valid, max_prefered;
2140
2141 if (ifp != ift->ifpub)
2142 continue;
2143
2144 /* RFC 4941 section 3.3:
2145 * If a received option will extend the lifetime of a public
2146 * address, the lifetimes of temporary addresses should
2147 * be extended, subject to the overall constraint that no
2148 * temporary addresses should ever remain "valid" or "preferred"
2149 * for a time longer than (TEMP_VALID_LIFETIME) or
2150 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), respectively.
2151 */
2152 age = (now - ift->cstamp) / HZ;
2153 max_valid = idev->cnf.temp_valid_lft - age;
2154 if (max_valid < 0)
2155 max_valid = 0;
2156
2157 max_prefered = idev->cnf.temp_prefered_lft -
2158 idev->cnf.max_desync_factor - age;
2159 if (max_prefered < 0)
2160 max_prefered = 0;
2161
2162 if (valid_lft > max_valid)
2163 valid_lft = max_valid;
2164
2165 if (prefered_lft > max_prefered)
2166 prefered_lft = max_prefered;
2167
2168 spin_lock(&ift->lock);
2169 flags = ift->flags;
2170 ift->valid_lft = valid_lft;
2171 ift->prefered_lft = prefered_lft;
2172 ift->tstamp = now;
2173 if (prefered_lft > 0)
2174 ift->flags &= ~IFA_F_DEPRECATED;
2175
2176 spin_unlock(&ift->lock);
2177 if (!(flags&IFA_F_TENTATIVE))
2178 ipv6_ifa_notify(0, ift);
2179 }
2180
2181 if ((create || list_empty(&idev->tempaddr_list)) &&
2182 idev->cnf.use_tempaddr > 0) {
2183 /* When a new public address is created as described
2184 * in [ADDRCONF], also create a new temporary address.
2185 * Also create a temporary address if it's enabled but
2186 * no temporary address currently exists.
2187 */
2188 read_unlock_bh(&idev->lock);
2189 ipv6_create_tempaddr(ifp, NULL);
2190 } else {
2191 read_unlock_bh(&idev->lock);
2192 }
2193}
2194
e6bff995 2195void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao)
1da177e4
LT		 2196{
2197 struct prefix_info *pinfo;
2198 __u32 valid_lft;
2199 __u32 prefered_lft;
2200 int addr_type;
64236f3f 2201 u32 addr_flags = 0;
1da177e4 2202 struct inet6_dev *in6_dev;
56d417b1 2203 struct net *net = dev_net(dev);
1da177e4
LT		 2204
2205 pinfo = (struct prefix_info *) opt;
1ab1457c 2206
1da177e4 2207 if (len < sizeof(struct prefix_info)) {
ba3542e1 2208 ADBG("addrconf: prefix option too short\n");
1da177e4
LT		 2209 return;
2210 }
1ab1457c 2211
1da177e4
LT		 2212 /*
2213 * Validation checks ([ADDRCONF], page 19)
2214 */
2215
2216 addr_type = ipv6_addr_type(&pinfo->prefix);
2217
2218 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
2219 return;
2220
2221 valid_lft = ntohl(pinfo->valid);
2222 prefered_lft = ntohl(pinfo->prefered);
2223
2224 if (prefered_lft > valid_lft) {
e87cc472 2225 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n");
1da177e4
LT		 2226 return;
2227 }
2228
2229 in6_dev = in6_dev_get(dev);
2230
2231 if (in6_dev == NULL) {
e87cc472
JP		 2232 net_dbg_ratelimited("addrconf: device %s not configured\n",
2233 dev->name);
1da177e4
LT		 2234 return;
2235 }
2236
2237 /*
2238 * Two things going on here:
2239 * 1) Add routes for on-link prefixes
2240 * 2) Configure prefixes with the auto flag set
2241 */
2242
4bed72e4
YH		 2243 if (pinfo->onlink) {
2244 struct rt6_info *rt;
2245 unsigned long rt_expires;
2246
6f704992
YH		 2247 /* Avoid arithmetic overflow. Really, we could
2248 * save rt_expires in seconds, likely valid_lft,
2249 * but it would require division in fib gc, that it
2250 * not good.
2251 */
4bed72e4
YH		 2252 if (HZ > USER_HZ)
2253 rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
2254 else
2255 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
3dd4bc68 2256
4bed72e4
YH		 2257 if (addrconf_finite_timeout(rt_expires))
2258 rt_expires *= HZ;
1da177e4 2259
14ef37b6
AH		 2260 rt = addrconf_get_prefix_route(&pinfo->prefix,
2261 pinfo->prefix_len,
2262 dev,
2263 RTF_ADDRCONF | RTF_PREFIX_RT,
2264 RTF_GATEWAY | RTF_DEFAULT);
1da177e4 2265
14ef37b6 2266 if (rt) {
6f704992
YH		 2267 /* Autoconf prefix route */
2268 if (valid_lft == 0) {
2269 ip6_del_rt(rt);
2270 rt = NULL;
4bed72e4 2271 } else if (addrconf_finite_timeout(rt_expires)) {
6f704992 2272 /* not infinity */
1716a961 2273 rt6_set_expires(rt, jiffies + rt_expires);
6f704992 2274 } else {
1716a961 2275 rt6_clean_expires(rt);
1da177e4
LT		 2276 }
2277 } else if (valid_lft) {
6f704992 2278 clock_t expires = 0;
4bed72e4
YH		 2279 int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
2280 if (addrconf_finite_timeout(rt_expires)) {
6f704992
YH		 2281 /* not infinity */
2282 flags |= RTF_EXPIRES;
2283 expires = jiffies_to_clock_t(rt_expires);
2284 }
1da177e4 2285 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
6f704992 2286 dev, expires, flags);
1da177e4 2287 }
94e187c0 2288 ip6_rt_put(rt);
1da177e4
LT		 2289 }
2290
2291 /* Try to figure out our local address for this prefix */
2292
2293 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
8e5e8f30 2294 struct inet6_ifaddr *ifp;
1da177e4
LT		 2295 struct in6_addr addr;
2296 int create = 0, update_lft = 0;
617fe29d 2297 bool tokenized = false;
1da177e4
LT		 2298
2299 if (pinfo->prefix_len == 64) {
2300 memcpy(&addr, &pinfo->prefix, 8);
f53adae4
DB		 2301
2302 if (!ipv6_addr_any(&in6_dev->token)) {
2303 read_lock_bh(&in6_dev->lock);
2304 memcpy(addr.s6_addr + 8,
2305 in6_dev->token.s6_addr + 8, 8);
2306 read_unlock_bh(&in6_dev->lock);
617fe29d 2307 tokenized = true;
622c81d5
HFS		 2308 } else if (in6_dev->addr_gen_mode ==
2309 IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
2310 !ipv6_generate_stable_address(&addr, 0,
2311 in6_dev)) {
64236f3f 2312 addr_flags |= IFA_F_STABLE_PRIVACY;
622c81d5 2313 goto ok;
f53adae4
DB		 2314 } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
2315 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
1da177e4
LT		 2316 in6_dev_put(in6_dev);
2317 return;
2318 }
2319 goto ok;
2320 }
e87cc472
JP		 2321 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n",
2322 pinfo->prefix_len);
1da177e4
LT		 2323 in6_dev_put(in6_dev);
2324 return;
2325
2326ok:
2327
53b7997f 2328 ifp = ipv6_get_ifaddr(net, &addr, dev, 1);
1da177e4
LT		 2329
2330 if (ifp == NULL && valid_lft) {
2331 int max_addresses = in6_dev->cnf.max_addresses;
95c385b4
NH		 2332
2333#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2334 if (in6_dev->cnf.optimistic_dad &&
e6bff995 2335 !net->ipv6.devconf_all->forwarding && sllao)
95c385b4
NH		 2336 addr_flags = IFA_F_OPTIMISTIC;
2337#endif
1da177e4
LT		 2338
2339 /* Do not allow to create too much of autoconfigured
2340 * addresses; this would be too easy way to crash kernel.
2341 */
2342 if (!max_addresses ||
2343 ipv6_count_addresses(in6_dev) < max_addresses)
3f8f5298
JP		 2344 ifp = ipv6_add_addr(in6_dev, &addr, NULL,
2345 pinfo->prefix_len,
95c385b4 2346 addr_type&IPV6_ADDR_SCOPE_MASK,
8a226b2c
JB		 2347 addr_flags, valid_lft,
2348 prefered_lft);
1da177e4 2349
3f0d2ba0 2350 if (IS_ERR_OR_NULL(ifp)) {
1da177e4
LT		 2351 in6_dev_put(in6_dev);
2352 return;
2353 }
2354
8a226b2c
JB		 2355 update_lft = 0;
2356 create = 1;
c15b1cca
HFS		 2357 spin_lock_bh(&ifp->lock);
2358 ifp->flags |= IFA_F_MANAGETEMPADDR;
1da177e4 2359 ifp->cstamp = jiffies;
617fe29d 2360 ifp->tokenized = tokenized;
c15b1cca 2361 spin_unlock_bh(&ifp->lock);
cf22f9a2 2362 addrconf_dad_start(ifp);
1da177e4
LT		 2363 }
2364
2365 if (ifp) {
479840ff 2366 u32 flags;
1da177e4 2367 unsigned long now;
1da177e4
LT		 2368 u32 stored_lft;
2369
2370 /* update lifetime (RFC2462 5.5.3 e) */
8e8e676d 2371 spin_lock_bh(&ifp->lock);
1da177e4
LT		 2372 now = jiffies;
2373 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
2374 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
2375 else
2376 stored_lft = 0;
8a226b2c 2377 if (!update_lft && !create && stored_lft) {
9451a304
FF		 2378 const u32 minimum_lft = min_t(u32,
2379 stored_lft, MIN_VALID_LIFETIME);
c9d55d5b
PM		 2380 valid_lft = max(valid_lft, minimum_lft);
2381
2382 /* RFC4862 Section 5.5.3e:
2383 * "Note that the preferred lifetime of the
2384 * corresponding address is always reset to
2385 * the Preferred Lifetime in the received
2386 * Prefix Information option, regardless of
2387 * whether the valid lifetime is also reset or
2388 * ignored."
2389 *
2390 * So we should always update prefered_lft here.
2391 */
2392 update_lft = 1;
1da177e4
LT		 2393 }
2394
2395 if (update_lft) {
2396 ifp->valid_lft = valid_lft;
2397 ifp->prefered_lft = prefered_lft;
2398 ifp->tstamp = now;
2399 flags = ifp->flags;
2400 ifp->flags &= ~IFA_F_DEPRECATED;
8e8e676d 2401 spin_unlock_bh(&ifp->lock);
1da177e4
LT		 2402
2403 if (!(flags&IFA_F_TENTATIVE))
2404 ipv6_ifa_notify(0, ifp);
2405 } else
8e8e676d 2406 spin_unlock_bh(&ifp->lock);
1da177e4 2407
53bd6749
JP		 2408 manage_tempaddrs(in6_dev, ifp, valid_lft, prefered_lft,
2409 create, now);
5d9efa7e 2410
1da177e4 2411 in6_ifa_put(ifp);
c15b1cca 2412 addrconf_verify();
1da177e4
LT		 2413 }
2414 }
2415 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
2416 in6_dev_put(in6_dev);
2417}
2418
2419/*
2420 * Set destination address.
2421 * Special case for SIT interfaces where we create a new "virtual"
2422 * device.
2423 */
af284937 2424int addrconf_set_dstaddr(struct net *net, void __user *arg)
1da177e4
LT		 2425{
2426 struct in6_ifreq ireq;
2427 struct net_device *dev;
2428 int err = -EINVAL;
2429
2430 rtnl_lock();
2431
2432 err = -EFAULT;
2433 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2434 goto err_exit;
2435
af284937 2436 dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
1da177e4
LT		 2437
2438 err = -ENODEV;
2439 if (dev == NULL)
2440 goto err_exit;
2441
07a93626 2442#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4 2443 if (dev->type == ARPHRD_SIT) {
5bc3eb7e 2444 const struct net_device_ops *ops = dev->netdev_ops;
1da177e4 2445 struct ifreq ifr;
1da177e4
LT		 2446 struct ip_tunnel_parm p;
2447
2448 err = -EADDRNOTAVAIL;
2449 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2450 goto err_exit;
2451
2452 memset(&p, 0, sizeof(p));
2453 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2454 p.iph.saddr = 0;
2455 p.iph.version = 4;
2456 p.iph.ihl = 5;
2457 p.iph.protocol = IPPROTO_IPV6;
2458 p.iph.ttl = 64;
d20b3109 2459 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
1da177e4 2460
5bc3eb7e
SH		 2461 if (ops->ndo_do_ioctl) {
2462 mm_segment_t oldfs = get_fs();
2463
2464 set_fs(KERNEL_DS);
2465 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2466 set_fs(oldfs);
2467 } else
2468 err = -EOPNOTSUPP;
1da177e4
LT		 2469
2470 if (err == 0) {
2471 err = -ENOBUFS;
af284937
DL		 2472 dev = __dev_get_by_name(net, p.name);
2473 if (!dev)
1da177e4
LT		 2474 goto err_exit;
2475 err = dev_open(dev);
2476 }
2477 }
0be669bb 2478#endif
1da177e4
LT		 2479
2480err_exit:
2481 rtnl_unlock();
2482 return err;
2483}
2484
93a714d6
MC		 2485static int ipv6_mc_config(struct sock *sk, bool join,
2486 const struct in6_addr *addr, int ifindex)
2487{
2488 int ret;
2489
2490 ASSERT_RTNL();
2491
2492 lock_sock(sk);
2493 if (join)
54ff9ef3 2494 ret = ipv6_sock_mc_join(sk, ifindex, addr);
93a714d6 2495 else
54ff9ef3 2496 ret = ipv6_sock_mc_drop(sk, ifindex, addr);
93a714d6
MC		 2497 release_sock(sk);
2498
2499 return ret;
2500}
2501
1da177e4
LT		 2502/*
2503 * Manual configuration of address on an interface
2504 */
479840ff
JP		 2505static int inet6_addr_add(struct net *net, int ifindex,
2506 const struct in6_addr *pfx,
caeaba79 2507 const struct in6_addr *peer_pfx,
479840ff
JP		 2508 unsigned int plen, __u32 ifa_flags,
2509 __u32 prefered_lft, __u32 valid_lft)
1da177e4
LT		 2510{
2511 struct inet6_ifaddr *ifp;
2512 struct inet6_dev *idev;
2513 struct net_device *dev;
93a714d6
MC		 2514 unsigned long timeout;
2515 clock_t expires;
1da177e4 2516 int scope;
6f704992 2517 u32 flags;
1da177e4
LT		 2518
2519 ASSERT_RTNL();
1ab1457c 2520
24ef0da7
TG		 2521 if (plen > 128)
2522 return -EINVAL;
2523
0778769d
NT		 2524 /* check the lifetime */
2525 if (!valid_lft || prefered_lft > valid_lft)
2526 return -EINVAL;
2527
53bd6749
JP		 2528 if (ifa_flags & IFA_F_MANAGETEMPADDR && plen != 64)
2529 return -EINVAL;
2530
af284937
DL		 2531 dev = __dev_get_by_index(net, ifindex);
2532 if (!dev)
1da177e4 2533 return -ENODEV;
1ab1457c 2534
64e724f6
BH		 2535 idev = addrconf_add_dev(dev);
2536 if (IS_ERR(idev))
2537 return PTR_ERR(idev);
1da177e4 2538
93a714d6
MC		 2539 if (ifa_flags & IFA_F_MCAUTOJOIN) {
2540 int ret = ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2541 true, pfx, ifindex);
2542
2543 if (ret < 0)
2544 return ret;
2545 }
2546
1da177e4
LT		 2547 scope = ipv6_addr_scope(pfx);
2548
4bed72e4
YH		 2549 timeout = addrconf_timeout_fixup(valid_lft, HZ);
2550 if (addrconf_finite_timeout(timeout)) {
2551 expires = jiffies_to_clock_t(timeout * HZ);
2552 valid_lft = timeout;
6f704992 2553 flags = RTF_EXPIRES;
4bed72e4
YH		 2554 } else {
2555 expires = 0;
2556 flags = 0;
2557 ifa_flags |= IFA_F_PERMANENT;
6f704992 2558 }
0778769d 2559
4bed72e4
YH		 2560 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
2561 if (addrconf_finite_timeout(timeout)) {
2562 if (timeout == 0)
2563 ifa_flags |= IFA_F_DEPRECATED;
2564 prefered_lft = timeout;
2565 }
0778769d 2566
8a226b2c
JB		 2567 ifp = ipv6_add_addr(idev, pfx, peer_pfx, plen, scope, ifa_flags,
2568 valid_lft, prefered_lft);
0778769d 2569
1da177e4 2570 if (!IS_ERR(ifp)) {
761aac73
TH		 2571 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) {
2572 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
2573 expires, flags);
2574 }
2575
95c385b4
NH		 2576 /*
2577 * Note that section 3.1 of RFC 4429 indicates
2578 * that the Optimistic flag should not be set for
2579 * manually configured addresses
2580 */
cf22f9a2 2581 addrconf_dad_start(ifp);
53bd6749
JP		 2582 if (ifa_flags & IFA_F_MANAGETEMPADDR)
2583 manage_tempaddrs(idev, ifp, valid_lft, prefered_lft,
2584 true, jiffies);
1da177e4 2585 in6_ifa_put(ifp);
c15b1cca 2586 addrconf_verify_rtnl();
1da177e4 2587 return 0;
93a714d6
MC		 2588 } else if (ifa_flags & IFA_F_MCAUTOJOIN) {
2589 ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2590 false, pfx, ifindex);
1da177e4
LT		 2591 }
2592
2593 return PTR_ERR(ifp);
2594}
2595
6046d5b4
HK		 2596static int inet6_addr_del(struct net *net, int ifindex, u32 ifa_flags,
2597 const struct in6_addr *pfx, unsigned int plen)
1da177e4
LT		 2598{
2599 struct inet6_ifaddr *ifp;
2600 struct inet6_dev *idev;
2601 struct net_device *dev;
1ab1457c 2602
24ef0da7
TG		 2603 if (plen > 128)
2604 return -EINVAL;
2605
af284937
DL		 2606 dev = __dev_get_by_index(net, ifindex);
2607 if (!dev)
1da177e4
LT		 2608 return -ENODEV;
2609
e5d08d71
IM		 2610 idev = __in6_dev_get(dev);
2611 if (idev == NULL)
1da177e4
LT		 2612 return -ENXIO;
2613
2614 read_lock_bh(&idev->lock);
502a2ffd 2615 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1da177e4
LT		 2616 if (ifp->prefix_len == plen &&
2617 ipv6_addr_equal(pfx, &ifp->addr)) {
2618 in6_ifa_hold(ifp);
2619 read_unlock_bh(&idev->lock);
1ab1457c 2620
6046d5b4
HK		 2621 if (!(ifp->flags & IFA_F_TEMPORARY) &&
2622 (ifa_flags & IFA_F_MANAGETEMPADDR))
2623 manage_tempaddrs(idev, ifp, 0, 0, false,
2624 jiffies);
1da177e4 2625 ipv6_del_addr(ifp);
6046d5b4 2626 addrconf_verify_rtnl();
93a714d6
MC		 2627 if (ipv6_addr_is_multicast(pfx)) {
2628 ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2629 false, pfx, dev->ifindex);
2630 }
1da177e4
LT		 2631 return 0;
2632 }
2633 }
2634 read_unlock_bh(&idev->lock);
2635 return -EADDRNOTAVAIL;
2636}
2637
2638
af284937 2639int addrconf_add_ifaddr(struct net *net, void __user *arg)
1da177e4
LT		 2640{
2641 struct in6_ifreq ireq;
2642 int err;
1ab1457c 2643
af31f412 2644 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1da177e4 2645 return -EPERM;
1ab1457c 2646
1da177e4
LT		 2647 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2648 return -EFAULT;
2649
2650 rtnl_lock();
caeaba79 2651 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, NULL,
af284937
DL		 2652 ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2653 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
1da177e4
LT		 2654 rtnl_unlock();
2655 return err;
2656}
2657
af284937 2658int addrconf_del_ifaddr(struct net *net, void __user *arg)
1da177e4
LT		 2659{
2660 struct in6_ifreq ireq;
2661 int err;
1ab1457c 2662
af31f412 2663 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1da177e4
LT		 2664 return -EPERM;
2665
2666 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2667 return -EFAULT;
2668
2669 rtnl_lock();
6046d5b4 2670 err = inet6_addr_del(net, ireq.ifr6_ifindex, 0, &ireq.ifr6_addr,
af284937 2671 ireq.ifr6_prefixlen);
1da177e4
LT		 2672 rtnl_unlock();
2673 return err;
2674}
2675
b5f348e5
IJ		 2676static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
2677 int plen, int scope)
2678{
2679 struct inet6_ifaddr *ifp;
2680
8a226b2c 2681 ifp = ipv6_add_addr(idev, addr, NULL, plen,
07edd741
HFS		 2682 scope, IFA_F_PERMANENT,
2683 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
b5f348e5
IJ		 2684 if (!IS_ERR(ifp)) {
2685 spin_lock_bh(&ifp->lock);
2686 ifp->flags &= ~IFA_F_TENTATIVE;
2687 spin_unlock_bh(&ifp->lock);
2688 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2689 in6_ifa_put(ifp);
2690 }
2691}
2692
07a93626 2693#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4
LT		 2694static void sit_add_v4_addrs(struct inet6_dev *idev)
2695{
1da177e4
LT		 2696 struct in6_addr addr;
2697 struct net_device *dev;
c346dca1 2698 struct net *net = dev_net(idev->dev);
929c9cf3 2699 int scope, plen;
f0e2acfa 2700 u32 pflags = 0;
1da177e4
LT		 2701
2702 ASSERT_RTNL();
2703
2704 memset(&addr, 0, sizeof(struct in6_addr));
2705 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2706
2707 if (idev->dev->flags&IFF_POINTOPOINT) {
2708 addr.s6_addr32[0] = htonl(0xfe800000);
2709 scope = IFA_LINK;
929c9cf3 2710 plen = 64;
1da177e4
LT		 2711 } else {
2712 scope = IPV6_ADDR_COMPATv4;
929c9cf3 2713 plen = 96;
f0e2acfa 2714 pflags |= RTF_NONEXTHOP;
1da177e4
LT		 2715 }
2716
2717 if (addr.s6_addr32[3]) {
929c9cf3 2718 add_addr(idev, &addr, plen, scope);
f0e2acfa 2719 addrconf_prefix_route(&addr, plen, idev->dev, 0, pflags);
1da177e4
LT		 2720 return;
2721 }
2722
6fda7350 2723 for_each_netdev(net, dev) {
8e5e8f30 2724 struct in_device *in_dev = __in_dev_get_rtnl(dev);
1da177e4 2725 if (in_dev && (dev->flags & IFF_UP)) {
8e5e8f30 2726 struct in_ifaddr *ifa;
1da177e4
LT		 2727
2728 int flag = scope;
2729
2730 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
1da177e4
LT		 2731
2732 addr.s6_addr32[3] = ifa->ifa_local;
2733
2734 if (ifa->ifa_scope == RT_SCOPE_LINK)
2735 continue;
2736 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2737 if (idev->dev->flags&IFF_POINTOPOINT)
2738 continue;
2739 flag |= IFA_HOST;
2740 }
1da177e4 2741
b5f348e5 2742 add_addr(idev, &addr, plen, flag);
f0e2acfa
ND		 2743 addrconf_prefix_route(&addr, plen, idev->dev, 0,
2744 pflags);
1da177e4
LT		 2745 }
2746 }
1ab1457c 2747 }
1da177e4 2748}
0be669bb 2749#endif
1da177e4
LT		 2750
2751static void init_loopback(struct net_device *dev)
2752{
2753 struct inet6_dev *idev;
25fb6ca4
BK		 2754 struct net_device *sp_dev;
2755 struct inet6_ifaddr *sp_ifa;
2756 struct rt6_info *sp_rt;
1da177e4
LT		 2757
2758 /* ::1 */
2759
2760 ASSERT_RTNL();
2761
e5d08d71
IM		 2762 idev = ipv6_find_idev(dev);
2763 if (idev == NULL) {
91df42be 2764 pr_debug("%s: add_dev failed\n", __func__);
1da177e4
LT		 2765 return;
2766 }
2767
b5f348e5 2768 add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
25fb6ca4
BK		 2769
2770 /* Add routes to other interface's IPv6 addresses */
2771 for_each_netdev(dev_net(dev), sp_dev) {
2772 if (!strcmp(sp_dev->name, dev->name))
2773 continue;
2774
2775 idev = __in6_dev_get(sp_dev);
2776 if (!idev)
2777 continue;
2778
2779 read_lock_bh(&idev->lock);
2780 list_for_each_entry(sp_ifa, &idev->addr_list, if_list) {
2781
2782 if (sp_ifa->flags & (IFA_F_DADFAILED | IFA_F_TENTATIVE))
2783 continue;
2784
33d99113
G		 2785 if (sp_ifa->rt) {
2786 /* This dst has been added to garbage list when
2787 * lo device down, release this obsolete dst and
2788 * reallocate a new router for ifa.
2789 */
2790 if (sp_ifa->rt->dst.obsolete > 0) {
2791 ip6_rt_put(sp_ifa->rt);
2792 sp_ifa->rt = NULL;
2793 } else {
2794 continue;
2795 }
2796 }
a881ae1f 2797
57ec0afe 2798 sp_rt = addrconf_dst_alloc(idev, &sp_ifa->addr, false);
25fb6ca4
BK		 2799
2800 /* Failure cases are ignored */
534c8779
G		 2801 if (!IS_ERR(sp_rt)) {
2802 sp_ifa->rt = sp_rt;
25fb6ca4 2803 ip6_ins_rt(sp_rt);
534c8779 2804 }
25fb6ca4
BK		 2805 }
2806 read_unlock_bh(&idev->lock);
2807 }
1da177e4
LT		 2808}
2809
64236f3f
HFS		 2810static void addrconf_add_linklocal(struct inet6_dev *idev,
2811 const struct in6_addr *addr, u32 flags)
1da177e4 2812{
8e5e8f30 2813 struct inet6_ifaddr *ifp;
64236f3f 2814 u32 addr_flags = flags | IFA_F_PERMANENT;
95c385b4
NH		 2815
2816#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2817 if (idev->cnf.optimistic_dad &&
702beb87 2818 !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
95c385b4
NH		 2819 addr_flags |= IFA_F_OPTIMISTIC;
2820#endif
1da177e4 2821
07edd741
HFS		 2822 ifp = ipv6_add_addr(idev, addr, NULL, 64, IFA_LINK, addr_flags,
2823 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
1da177e4 2824 if (!IS_ERR(ifp)) {
46d48046 2825 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
cf22f9a2 2826 addrconf_dad_start(ifp);
1da177e4
LT		 2827 in6_ifa_put(ifp);
2828 }
2829}
2830
622c81d5
HFS		 2831static bool ipv6_reserved_interfaceid(struct in6_addr address)
2832{
2833 if ((address.s6_addr32[2] | address.s6_addr32[3]) == 0)
2834 return true;
2835
2836 if (address.s6_addr32[2] == htonl(0x02005eff) &&
2837 ((address.s6_addr32[3] & htonl(0xfe000000)) == htonl(0xfe000000)))
2838 return true;
2839
2840 if (address.s6_addr32[2] == htonl(0xfdffffff) &&
2841 ((address.s6_addr32[3] & htonl(0xffffff80)) == htonl(0xffffff80)))
2842 return true;
2843
2844 return false;
2845}
2846
2847static int ipv6_generate_stable_address(struct in6_addr *address,
2848 u8 dad_count,
2849 const struct inet6_dev *idev)
2850{
2851 static const int idgen_retries = 3;
2852
2853 static DEFINE_SPINLOCK(lock);
2854 static __u32 digest[SHA_DIGEST_WORDS];
2855 static __u32 workspace[SHA_WORKSPACE_WORDS];
2856
2857 static union {
2858 char __data[SHA_MESSAGE_BYTES];
2859 struct {
2860 struct in6_addr secret;
2861 __be64 prefix;
2862 unsigned char hwaddr[MAX_ADDR_LEN];
2863 u8 dad_count;
2864 } __packed;
2865 } data;
2866
2867 struct in6_addr secret;
2868 struct in6_addr temp;
2869 struct net *net = dev_net(idev->dev);
2870
2871 BUILD_BUG_ON(sizeof(data.__data) != sizeof(data));
2872
2873 if (idev->cnf.stable_secret.initialized)
2874 secret = idev->cnf.stable_secret.secret;
2875 else if (net->ipv6.devconf_dflt->stable_secret.initialized)
2876 secret = net->ipv6.devconf_dflt->stable_secret.secret;
2877 else
2878 return -1;
2879
2880retry:
2881 spin_lock_bh(&lock);
2882
2883 sha_init(digest);
2884 memset(&data, 0, sizeof(data));
2885 memset(workspace, 0, sizeof(workspace));
2886 memcpy(data.hwaddr, idev->dev->perm_addr, idev->dev->addr_len);
2887 data.prefix = ((__be64)address->s6_addr32[0] << 32) |
2888 (__be64)address->s6_addr32[1];
2889 data.secret = secret;
2890 data.dad_count = dad_count;
2891
2892 sha_transform(digest, data.__data, workspace);
2893
2894 temp = *address;
2895 temp.s6_addr32[2] = digest[0];
2896 temp.s6_addr32[3] = digest[1];
2897
2898 spin_unlock_bh(&lock);
2899
2900 if (ipv6_reserved_interfaceid(temp)) {
2901 dad_count++;
2902 if (dad_count > idgen_retries)
2903 return -1;
2904 goto retry;
2905 }
2906
2907 *address = temp;
2908 return 0;
2909}
2910
bc91b0f0
JP		 2911static void addrconf_addr_gen(struct inet6_dev *idev, bool prefix_route)
2912{
622c81d5
HFS		 2913 struct in6_addr addr;
2914
2915 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
bc91b0f0 2916
622c81d5
HFS		 2917 if (idev->addr_gen_mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY) {
2918 if (!ipv6_generate_stable_address(&addr, 0, idev))
64236f3f
HFS		 2919 addrconf_add_linklocal(idev, &addr,
2920 IFA_F_STABLE_PRIVACY);
622c81d5
HFS		 2921 else if (prefix_route)
2922 addrconf_prefix_route(&addr, 64, idev->dev, 0, 0);
2923 } else if (idev->addr_gen_mode == IN6_ADDR_GEN_MODE_EUI64) {
bc91b0f0
JP		 2924 /* addrconf_add_linklocal also adds a prefix_route and we
2925 * only need to care about prefix routes if ipv6_generate_eui64
2926 * couldn't generate one.
2927 */
2928 if (ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) == 0)
64236f3f 2929 addrconf_add_linklocal(idev, &addr, 0);
bc91b0f0
JP		 2930 else if (prefix_route)
2931 addrconf_prefix_route(&addr, 64, idev->dev, 0, 0);
2932 }
2933}
2934
1da177e4
LT		 2935static void addrconf_dev_config(struct net_device *dev)
2936{
8e5e8f30 2937 struct inet6_dev *idev;
1da177e4
LT		 2938
2939 ASSERT_RTNL();
2940
74235a25
HX		 2941 if ((dev->type != ARPHRD_ETHER) &&
2942 (dev->type != ARPHRD_FDDI) &&
74235a25 2943 (dev->type != ARPHRD_ARCNET) &&
06a4c1c5 2944 (dev->type != ARPHRD_INFINIBAND) &&
cb6bf355 2945 (dev->type != ARPHRD_IEEE802154) &&
e837735e 2946 (dev->type != ARPHRD_IEEE1394) &&
e74bccb8
JR		 2947 (dev->type != ARPHRD_TUNNEL6) &&
2948 (dev->type != ARPHRD_6LOWPAN)) {
74235a25
HX		 2949 /* Alas, we support only Ethernet autoconfiguration. */
2950 return;
2951 }
2952
1da177e4 2953 idev = addrconf_add_dev(dev);
64e724f6 2954 if (IS_ERR(idev))
1da177e4
LT		 2955 return;
2956
bc91b0f0 2957 addrconf_addr_gen(idev, false);
1da177e4
LT		 2958}
2959
07a93626 2960#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4
LT		 2961static void addrconf_sit_config(struct net_device *dev)
2962{
2963 struct inet6_dev *idev;
2964
2965 ASSERT_RTNL();
2966
1ab1457c
YH		 2967 /*
2968 * Configure the tunnel with one of our IPv4
2969 * addresses... we should configure all of
1da177e4
LT		 2970 * our v4 addrs in the tunnel
2971 */
2972
e5d08d71
IM		 2973 idev = ipv6_find_idev(dev);
2974 if (idev == NULL) {
91df42be 2975 pr_debug("%s: add_dev failed\n", __func__);
1da177e4
LT		 2976 return;
2977 }
2978
c7dc89c0 2979 if (dev->priv_flags & IFF_ISATAP) {
bc91b0f0 2980 addrconf_addr_gen(idev, false);
c7dc89c0
FT		 2981 return;
2982 }
2983
1da177e4
LT		 2984 sit_add_v4_addrs(idev);
2985
62b54dd9 2986 if (dev->flags&IFF_POINTOPOINT)
1da177e4 2987 addrconf_add_mroute(dev);
1da177e4 2988}
0be669bb 2989#endif
1da177e4 2990
07a93626 2991#if IS_ENABLED(CONFIG_NET_IPGRE)
aee80b54 2992static void addrconf_gre_config(struct net_device *dev)
2993{
2994 struct inet6_dev *idev;
aee80b54 2995
aee80b54 2996 ASSERT_RTNL();
2997
e5d08d71
IM		 2998 idev = ipv6_find_idev(dev);
2999 if (idev == NULL) {
91df42be 3000 pr_debug("%s: add_dev failed\n", __func__);
aee80b54 3001 return;
3002 }
3003
bc91b0f0 3004 addrconf_addr_gen(idev, true);
aee80b54 3005}
3006#endif
3007
1ab1457c 3008static int addrconf_notify(struct notifier_block *this, unsigned long event,
351638e7 3009 void *ptr)
1da177e4 3010{
351638e7 3011 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
748e2d93 3012 struct inet6_dev *idev = __in6_dev_get(dev);
c5e33bdd 3013 int run_pending = 0;
b217d616 3014 int err;
1da177e4 3015
e21e8467 3016 switch (event) {
45ba9dd2 3017 case NETDEV_REGISTER:
74235a25 3018 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
45ba9dd2 3019 idev = ipv6_add_dev(dev);
a317a2f1
WC		 3020 if (IS_ERR(idev))
3021 return notifier_from_errno(PTR_ERR(idev));
45ba9dd2
YH		 3022 }
3023 break;
bcdd553f 3024
1da177e4 3025 case NETDEV_UP:
3c21edbd 3026 case NETDEV_CHANGE:
c2edacf8
JV		 3027 if (dev->flags & IFF_SLAVE)
3028 break;
3029
3ce62a84
WC		 3030 if (idev && idev->cnf.disable_ipv6)
3031 break;
3032
3c21edbd 3033 if (event == NETDEV_UP) {
f24e3d65 3034 if (!addrconf_qdisc_ok(dev)) {
3c21edbd 3035 /* device is not ready yet. */
f3213831 3036 pr_info("ADDRCONF(NETDEV_UP): %s: link is not ready\n",
3c21edbd
YH		 3037 dev->name);
3038 break;
3039 }
99081049 3040
d31c7b8f
EP		 3041 if (!idev && dev->mtu >= IPV6_MIN_MTU)
3042 idev = ipv6_add_dev(dev);
3043
a317a2f1 3044 if (!IS_ERR_OR_NULL(idev)) {
99081049 3045 idev->if_flags |= IF_READY;
e3ec6cfc
BT		 3046 run_pending = 1;
3047 }
3c21edbd 3048 } else {
f24e3d65 3049 if (!addrconf_qdisc_ok(dev)) {
3c21edbd
YH		 3050 /* device is still not ready. */
3051 break;
3052 }
3053
3054 if (idev) {
bcdd553f 3055 if (idev->if_flags & IF_READY)
3c21edbd
YH		 3056 /* device is already configured. */
3057 break;
3c21edbd
YH		 3058 idev->if_flags |= IF_READY;
3059 }
3060
f3213831
JP		 3061 pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n",
3062 dev->name);
3c21edbd 3063
c5e33bdd 3064 run_pending = 1;
3c21edbd
YH		 3065 }
3066
e21e8467 3067 switch (dev->type) {
07a93626 3068#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4
LT		 3069 case ARPHRD_SIT:
3070 addrconf_sit_config(dev);
3071 break;
aee80b54 3072#endif
07a93626 3073#if IS_ENABLED(CONFIG_NET_IPGRE)
aee80b54 3074 case ARPHRD_IPGRE:
3075 addrconf_gre_config(dev);
3076 break;
0be669bb 3077#endif
1da177e4
LT		 3078 case ARPHRD_LOOPBACK:
3079 init_loopback(dev);
3080 break;
3081
3082 default:
3083 addrconf_dev_config(dev);
3084 break;
3ff50b79 3085 }
bcdd553f 3086
a317a2f1 3087 if (!IS_ERR_OR_NULL(idev)) {
c5e33bdd
YH		 3088 if (run_pending)
3089 addrconf_dad_run(idev);
3090
bcdd553f
SH		 3091 /*
3092 * If the MTU changed during the interface down,
3093 * when the interface up, the changed MTU must be
3094 * reflected in the idev as well as routers.
1da177e4 3095 */
bcdd553f
SH		 3096 if (idev->cnf.mtu6 != dev->mtu &&
3097 dev->mtu >= IPV6_MIN_MTU) {
1da177e4
LT		 3098 rt6_mtu_change(dev, dev->mtu);
3099 idev->cnf.mtu6 = dev->mtu;
3100 }
3101 idev->tstamp = jiffies;
3102 inet6_ifinfo_notify(RTM_NEWLINK, idev);
bcdd553f
SH		 3103
3104 /*
3105 * If the changed mtu during down is lower than
3106 * IPV6_MIN_MTU stop IPv6 on this interface.
1da177e4
LT		 3107 */
3108 if (dev->mtu < IPV6_MIN_MTU)
bcdd553f 3109 addrconf_ifdown(dev, 1);
1da177e4
LT		 3110 }
3111 break;
3112
3113 case NETDEV_CHANGEMTU:
d31c7b8f 3114 if (idev && dev->mtu >= IPV6_MIN_MTU) {
1da177e4
LT		 3115 rt6_mtu_change(dev, dev->mtu);
3116 idev->cnf.mtu6 = dev->mtu;
3117 break;
3118 }
3119
d31c7b8f
EP		 3120 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
3121 idev = ipv6_add_dev(dev);
a317a2f1 3122 if (!IS_ERR(idev))
d31c7b8f
EP		 3123 break;
3124 }
3125
bcdd553f 3126 /*
db9c7c39 3127 * if MTU under IPV6_MIN_MTU.
bcdd553f
SH		 3128 * Stop IPv6 on this interface.
3129 */
1da177e4
LT		 3130
3131 case NETDEV_DOWN:
3132 case NETDEV_UNREGISTER:
3133 /*
3134 * Remove all addresses from this interface.
3135 */
3136 addrconf_ifdown(dev, event != NETDEV_DOWN);
3137 break;
3c21edbd 3138
1da177e4 3139 case NETDEV_CHANGENAME:
1da177e4 3140 if (idev) {
5632c515 3141 snmp6_unregister_dev(idev);
408c4768 3142 addrconf_sysctl_unregister(idev);
a317a2f1 3143 err = addrconf_sysctl_register(idev);
b217d616
HX		 3144 if (err)
3145 return notifier_from_errno(err);
a317a2f1
WC		 3146 err = snmp6_register_dev(idev);
3147 if (err) {
3148 addrconf_sysctl_unregister(idev);
3149 return notifier_from_errno(err);
3150 }
5632c515 3151 }
1da177e4 3152 break;
bcdd553f 3153
93d9b7d7
JP		 3154 case NETDEV_PRE_TYPE_CHANGE:
3155 case NETDEV_POST_TYPE_CHANGE:
3156 addrconf_type_change(dev, event);
75c78500 3157 break;
3ff50b79 3158 }
1da177e4
LT		 3159
3160 return NOTIFY_OK;
3161}
3162
3163/*
3164 * addrconf module should be notified of a device going up
3165 */
3166static struct notifier_block ipv6_dev_notf = {
3167 .notifier_call = addrconf_notify,
1da177e4
LT		 3168};
3169
93d9b7d7 3170static void addrconf_type_change(struct net_device *dev, unsigned long event)
75c78500
MS		 3171{
3172 struct inet6_dev *idev;
3173 ASSERT_RTNL();
3174
3175 idev = __in6_dev_get(dev);
3176
93d9b7d7 3177 if (event == NETDEV_POST_TYPE_CHANGE)
75c78500 3178 ipv6_mc_remap(idev);
93d9b7d7 3179 else if (event == NETDEV_PRE_TYPE_CHANGE)
75c78500
MS		 3180 ipv6_mc_unmap(idev);
3181}
3182
1da177e4
LT		 3183static int addrconf_ifdown(struct net_device *dev, int how)
3184{
c346dca1 3185 struct net *net = dev_net(dev);
502a2ffd 3186 struct inet6_dev *idev;
3187 struct inet6_ifaddr *ifa;
73a8bd74 3188 int state, i;
1da177e4
LT		 3189
3190 ASSERT_RTNL();
3191
73a8bd74
DM		 3192 rt6_ifdown(net, dev);
3193 neigh_ifdown(&nd_tbl, dev);
1da177e4
LT		 3194
3195 idev = __in6_dev_get(dev);
3196 if (idev == NULL)
3197 return -ENODEV;
3198
bcdd553f
SH		 3199 /*
3200 * Step 1: remove reference to ipv6 device from parent device.
3201 * Do not dev_put!
1da177e4 3202 */
439e2385 3203 if (how) {
1da177e4 3204 idev->dead = 1;
8814c4b5
YH		 3205
3206 /* protected by rtnl_lock */
a9b3cd7f 3207 RCU_INIT_POINTER(dev->ip6_ptr, NULL);
1da177e4
LT		 3208
3209 /* Step 1.5: remove snmp6 entry */
3210 snmp6_unregister_dev(idev);
3211
3212 }
3213
73a8bd74
DM		 3214 /* Step 2: clear hash table */
3215 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3216 struct hlist_head *h = &inet6_addr_lst[i];
73a8bd74
DM		 3217
3218 spin_lock_bh(&addrconf_hash_lock);
67ba4152 3219restart:
b67bfe0d 3220 hlist_for_each_entry_rcu(ifa, h, addr_lst) {
73a8bd74
DM		 3221 if (ifa->idev == idev) {
3222 hlist_del_init_rcu(&ifa->addr_lst);
c15b1cca 3223 addrconf_del_dad_work(ifa);
73a8bd74
DM		 3224 goto restart;
3225 }
3226 }
3227 spin_unlock_bh(&addrconf_hash_lock);
3228 }
3229
1da177e4
LT		 3230 write_lock_bh(&idev->lock);
3231
b7b1bfce
HFS		 3232 addrconf_del_rs_timer(idev);
3233
bcdd553f 3234 /* Step 2: clear flags for stateless addrconf */
439e2385 3235 if (!how)
3c21edbd 3236 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
1da177e4 3237
439e2385 3238 if (how && del_timer(&idev->regen_timer))
1da177e4
LT		 3239 in6_dev_put(idev);
3240
bcdd553f 3241 /* Step 3: clear tempaddr list */
372e6c8f 3242 while (!list_empty(&idev->tempaddr_list)) {
3243 ifa = list_first_entry(&idev->tempaddr_list,
3244 struct inet6_ifaddr, tmp_list);
3245 list_del(&ifa->tmp_list);
1da177e4
LT		 3246 write_unlock_bh(&idev->lock);
3247 spin_lock_bh(&ifa->lock);
3248
3249 if (ifa->ifpub) {
3250 in6_ifa_put(ifa->ifpub);
3251 ifa->ifpub = NULL;
3252 }
3253 spin_unlock_bh(&ifa->lock);
3254 in6_ifa_put(ifa);
3255 write_lock_bh(&idev->lock);
3256 }
8f37ada5 3257
502a2ffd 3258 while (!list_empty(&idev->addr_list)) {
3259 ifa = list_first_entry(&idev->addr_list,
3260 struct inet6_ifaddr, if_list);
c15b1cca 3261 addrconf_del_dad_work(ifa);
84e8b803 3262
73a8bd74 3263 list_del(&ifa->if_list);
84e8b803 3264
73a8bd74 3265 write_unlock_bh(&idev->lock);
84e8b803 3266
8e8e676d 3267 spin_lock_bh(&ifa->lock);
73a8bd74
DM		 3268 state = ifa->state;
3269 ifa->state = INET6_IFADDR_STATE_DEAD;
8e8e676d 3270 spin_unlock_bh(&ifa->lock);
9d82ca98 3271
73a8bd74
DM		 3272 if (state != INET6_IFADDR_STATE_DEAD) {
3273 __ipv6_ifa_notify(RTM_DELADDR, ifa);
f88c91dd 3274 inet6addr_notifier_call_chain(NETDEV_DOWN, ifa);
27bdb2ab 3275 }
73a8bd74 3276 in6_ifa_put(ifa);
8f37ada5 3277
73a8bd74
DM		 3278 write_lock_bh(&idev->lock);
3279 }
8f37ada5 3280
1da177e4
LT		 3281 write_unlock_bh(&idev->lock);
3282
381f4dca
SD		 3283 /* Step 5: Discard anycast and multicast list */
3284 if (how) {
3285 ipv6_ac_destroy_dev(idev);
1da177e4 3286 ipv6_mc_destroy_dev(idev);
381f4dca 3287 } else {
1da177e4 3288 ipv6_mc_down(idev);
381f4dca 3289 }
1da177e4 3290
1da177e4 3291 idev->tstamp = jiffies;
1ab1457c 3292
bcdd553f 3293 /* Last: Shot the device (if unregistered) */
439e2385 3294 if (how) {
408c4768 3295 addrconf_sysctl_unregister(idev);
1da177e4
LT		 3296 neigh_parms_release(&nd_tbl, idev->nd_parms);
3297 neigh_ifdown(&nd_tbl, dev);
3298 in6_dev_put(idev);
3299 }
3300 return 0;
3301}
3302
3303static void addrconf_rs_timer(unsigned long data)
3304{
b7b1bfce 3305 struct inet6_dev *idev = (struct inet6_dev *)data;
caf92bc4 3306 struct net_device *dev = idev->dev;
b7b1bfce 3307 struct in6_addr lladdr;
1da177e4 3308
b7b1bfce 3309 write_lock(&idev->lock);
5b2a1953 3310 if (idev->dead || !(idev->if_flags & IF_READY))
1da177e4
LT		 3311 goto out;
3312
9ba2add3 3313 if (!ipv6_accept_ra(idev))
5b2a1953 3314 goto out;
3315
3316 /* Announcement received after solicitation was sent */
3317 if (idev->if_flags & IF_RA_RCVD)
1da177e4 3318 goto out;
1da177e4 3319
b7b1bfce 3320 if (idev->rs_probes++ < idev->cnf.rtr_solicits) {
caf92bc4
CW		 3321 write_unlock(&idev->lock);
3322 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
3323 ndisc_send_rs(dev, &lladdr,
b7b1bfce
HFS		 3324 &in6addr_linklocal_allrouters);
3325 else
caf92bc4 3326 goto put;
1da177e4 3327
caf92bc4 3328 write_lock(&idev->lock);
b7b1bfce
HFS		 3329 /* The wait after the last probe can be shorter */
3330 addrconf_mod_rs_timer(idev, (idev->rs_probes ==
3331 idev->cnf.rtr_solicits) ?
3332 idev->cnf.rtr_solicit_delay :
3333 idev->cnf.rtr_solicit_interval);
1da177e4 3334 } else {
1da177e4
LT		 3335 /*
3336 * Note: we do not support deprecated "all on-link"
3337 * assumption any longer.
3338 */
91df42be 3339 pr_debug("%s: no IPv6 routers present\n", idev->dev->name);
1da177e4
LT		 3340 }
3341
3342out:
b7b1bfce 3343 write_unlock(&idev->lock);
caf92bc4 3344put:
b7b1bfce 3345 in6_dev_put(idev);
1da177e4
LT		 3346}
3347
3348/*
3349 * Duplicate Address Detection
3350 */
3c21edbd
YH		 3351static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
3352{
3353 unsigned long rand_num;
3354 struct inet6_dev *idev = ifp->idev;
3355
95c385b4
NH		 3356 if (ifp->flags & IFA_F_OPTIMISTIC)
3357 rand_num = 0;
3358 else
63862b5b 3359 rand_num = prandom_u32() % (idev->cnf.rtr_solicit_delay ? : 1);
95c385b4 3360
b7b1bfce 3361 ifp->dad_probes = idev->cnf.dad_transmits;
c15b1cca 3362 addrconf_mod_dad_work(ifp, rand_num);
3c21edbd
YH		 3363}
3364
c15b1cca 3365static void addrconf_dad_begin(struct inet6_ifaddr *ifp)
1da177e4
LT		 3366{
3367 struct inet6_dev *idev = ifp->idev;
3368 struct net_device *dev = idev->dev;
1da177e4
LT		 3369
3370 addrconf_join_solict(dev, &ifp->addr);
3371
63862b5b 3372 prandom_seed((__force u32) ifp->addr.s6_addr32[3]);
1da177e4
LT		 3373
3374 read_lock_bh(&idev->lock);
622ccdf1 3375 spin_lock(&ifp->lock);
e9d3e084 3376 if (ifp->state == INET6_IFADDR_STATE_DEAD)
1da177e4 3377 goto out;
1da177e4
LT		 3378
3379 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
1b34be74 3380 idev->cnf.accept_dad < 1 ||
55ebaef1
NT		 3381 !(ifp->flags&IFA_F_TENTATIVE) ||
3382 ifp->flags & IFA_F_NODAD) {
cc411d0b 3383 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
21809faf 3384 spin_unlock(&ifp->lock);
1da177e4
LT		 3385 read_unlock_bh(&idev->lock);
3386
3387 addrconf_dad_completed(ifp);
3388 return;
3389 }
3390
6732bade 3391 if (!(idev->if_flags & IF_READY)) {
21809faf 3392 spin_unlock(&ifp->lock);
6732bade 3393 read_unlock_bh(&idev->lock);
3c21edbd 3394 /*
590a9887 3395 * If the device is not ready:
3c21edbd
YH		 3396 * - keep it tentative if it is a permanent address.
3397 * - otherwise, kill it.
3398 */
3399 in6_ifa_hold(ifp);
cc411d0b 3400 addrconf_dad_stop(ifp, 0);
6732bade 3401 return;
3c21edbd 3402 }
95c385b4
NH		 3403
3404 /*
3405 * Optimistic nodes can start receiving
3406 * Frames right away
3407 */
7fd2561e 3408 if (ifp->flags & IFA_F_OPTIMISTIC) {
95c385b4 3409 ip6_ins_rt(ifp->rt);
7fd2561e
EK		 3410 if (ipv6_use_optimistic_addr(idev)) {
3411 /* Because optimistic nodes can use this address,
3412 * notify listeners. If DAD fails, RTM_DELADDR is sent.
3413 */
3414 ipv6_ifa_notify(RTM_NEWADDR, ifp);
3415 }
3416 }
95c385b4 3417
6732bade 3418 addrconf_dad_kick(ifp);
1da177e4 3419out:
622ccdf1 3420 spin_unlock(&ifp->lock);
1da177e4
LT		 3421 read_unlock_bh(&idev->lock);
3422}
3423
c15b1cca 3424static void addrconf_dad_start(struct inet6_ifaddr *ifp)
1da177e4 3425{
c15b1cca
HFS		 3426 bool begin_dad = false;
3427
8e8e676d 3428 spin_lock_bh(&ifp->lock);
c15b1cca
HFS		 3429 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
3430 ifp->state = INET6_IFADDR_STATE_PREDAD;
3431 begin_dad = true;
3432 }
8e8e676d 3433 spin_unlock_bh(&ifp->lock);
c15b1cca
HFS		 3434
3435 if (begin_dad)
3436 addrconf_mod_dad_work(ifp, 0);
3437}
3438
3439static void addrconf_dad_work(struct work_struct *w)
3440{
3441 struct inet6_ifaddr *ifp = container_of(to_delayed_work(w),
3442 struct inet6_ifaddr,
3443 dad_work);
1da177e4 3444 struct inet6_dev *idev = ifp->idev;
1da177e4
LT		 3445 struct in6_addr mcaddr;
3446
c15b1cca
HFS		 3447 enum {
3448 DAD_PROCESS,
3449 DAD_BEGIN,
3450 DAD_ABORT,
3451 } action = DAD_PROCESS;
3452
3453 rtnl_lock();
3454
8e8e676d 3455 spin_lock_bh(&ifp->lock);
c15b1cca
HFS		 3456 if (ifp->state == INET6_IFADDR_STATE_PREDAD) {
3457 action = DAD_BEGIN;
3458 ifp->state = INET6_IFADDR_STATE_DAD;
3459 } else if (ifp->state == INET6_IFADDR_STATE_ERRDAD) {
3460 action = DAD_ABORT;
3461 ifp->state = INET6_IFADDR_STATE_POSTDAD;
3462 }
8e8e676d 3463 spin_unlock_bh(&ifp->lock);
c15b1cca
HFS		 3464
3465 if (action == DAD_BEGIN) {
3466 addrconf_dad_begin(ifp);
3467 goto out;
3468 } else if (action == DAD_ABORT) {
3469 addrconf_dad_stop(ifp, 1);
3470 goto out;
3471 }
3472
b7b1bfce 3473 if (!ifp->dad_probes && addrconf_dad_end(ifp))
f2344a13
HX		 3474 goto out;
3475
c15b1cca 3476 write_lock_bh(&idev->lock);
122e4519 3477 if (idev->dead || !(idev->if_flags & IF_READY)) {
c15b1cca 3478 write_unlock_bh(&idev->lock);
1da177e4
LT		 3479 goto out;
3480 }
21809faf 3481
3482 spin_lock(&ifp->lock);
622ccdf1
HX		 3483 if (ifp->state == INET6_IFADDR_STATE_DEAD) {
3484 spin_unlock(&ifp->lock);
c15b1cca 3485 write_unlock_bh(&idev->lock);
622ccdf1
HX		 3486 goto out;
3487 }
3488
b7b1bfce 3489 if (ifp->dad_probes == 0) {
1da177e4
LT		 3490 /*
3491 * DAD was successful
3492 */
3493
cc411d0b 3494 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
21809faf 3495 spin_unlock(&ifp->lock);
c15b1cca 3496 write_unlock_bh(&idev->lock);
1da177e4
LT		 3497
3498 addrconf_dad_completed(ifp);
3499
3500 goto out;
3501 }
3502
b7b1bfce 3503 ifp->dad_probes--;
c15b1cca
HFS		 3504 addrconf_mod_dad_work(ifp,
3505 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME));
21809faf 3506 spin_unlock(&ifp->lock);
c15b1cca 3507 write_unlock_bh(&idev->lock);
1da177e4
LT		 3508
3509 /* send a neighbour solicitation for our addr */
1da177e4 3510 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
d7aabf22 3511 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &in6addr_any);
1da177e4
LT		 3512out:
3513 in6_ifa_put(ifp);
c15b1cca 3514 rtnl_unlock();
1da177e4
LT		 3515}
3516
11ffff75
HFS		 3517/* ifp->idev must be at least read locked */
3518static bool ipv6_lonely_lladdr(struct inet6_ifaddr *ifp)
3519{
3520 struct inet6_ifaddr *ifpiter;
3521 struct inet6_dev *idev = ifp->idev;
3522
602582ca
HFS		 3523 list_for_each_entry_reverse(ifpiter, &idev->addr_list, if_list) {
3524 if (ifpiter->scope > IFA_LINK)
3525 break;
11ffff75
HFS		 3526 if (ifp != ifpiter && ifpiter->scope == IFA_LINK &&
3527 (ifpiter->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE|
3528 IFA_F_OPTIMISTIC|IFA_F_DADFAILED)) ==
3529 IFA_F_PERMANENT)
3530 return false;
3531 }
3532 return true;
3533}
3534
1da177e4
LT		 3535static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
3536{
e21e8467 3537 struct net_device *dev = ifp->idev->dev;
b7b1bfce 3538 struct in6_addr lladdr;
b173ee48 3539 bool send_rs, send_mld;
b7b1bfce 3540
c15b1cca 3541 addrconf_del_dad_work(ifp);
1da177e4
LT		 3542
3543 /*
3544 * Configure the address for reception. Now it is valid.
3545 */
3546
3547 ipv6_ifa_notify(RTM_NEWADDR, ifp);
3548
026359bc
TA		 3549 /* If added prefix is link local and we are prepared to process
3550 router advertisements, start sending router solicitations.
1da177e4
LT		 3551 */
3552
1ec047eb 3553 read_lock_bh(&ifp->idev->lock);
11ffff75 3554 send_mld = ifp->scope == IFA_LINK && ipv6_lonely_lladdr(ifp);
b173ee48
HFS		 3555 send_rs = send_mld &&
3556 ipv6_accept_ra(ifp->idev) &&
1ec047eb 3557 ifp->idev->cnf.rtr_solicits > 0 &&
b173ee48 3558 (dev->flags&IFF_LOOPBACK) == 0;
1ec047eb
HFS		 3559 read_unlock_bh(&ifp->idev->lock);
3560
b173ee48
HFS		 3561 /* While dad is in progress mld report's source address is in6_addrany.
3562 * Resend with proper ll now.
3563 */
3564 if (send_mld)
3565 ipv6_mc_dad_complete(ifp->idev);
3566
1ec047eb 3567 if (send_rs) {
1da177e4
LT		 3568 /*
3569 * If a host as already performed a random delay
3570 * [...] as part of DAD [...] there is no need
3571 * to delay again before sending the first RS
3572 */
1ec047eb 3573 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
b7b1bfce 3574 return;
1ec047eb 3575 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters);
1da177e4 3576
b7b1bfce
HFS		 3577 write_lock_bh(&ifp->idev->lock);
3578 spin_lock(&ifp->lock);
3579 ifp->idev->rs_probes = 1;
1da177e4 3580 ifp->idev->if_flags |= IF_RS_SENT;
b7b1bfce
HFS		 3581 addrconf_mod_rs_timer(ifp->idev,
3582 ifp->idev->cnf.rtr_solicit_interval);
3583 spin_unlock(&ifp->lock);
3584 write_unlock_bh(&ifp->idev->lock);
1da177e4
LT		 3585 }
3586}
3587
e21e8467
SH		 3588static void addrconf_dad_run(struct inet6_dev *idev)
3589{
c5e33bdd
YH		 3590 struct inet6_ifaddr *ifp;
3591
3592 read_lock_bh(&idev->lock);
502a2ffd 3593 list_for_each_entry(ifp, &idev->addr_list, if_list) {
21809faf 3594 spin_lock(&ifp->lock);
f2344a13
HX		 3595 if (ifp->flags & IFA_F_TENTATIVE &&
3596 ifp->state == INET6_IFADDR_STATE_DAD)
3597 addrconf_dad_kick(ifp);
21809faf 3598 spin_unlock(&ifp->lock);
c5e33bdd
YH		 3599 }
3600 read_unlock_bh(&idev->lock);
3601}
3602
1da177e4
LT		 3603#ifdef CONFIG_PROC_FS
3604struct if6_iter_state {
3c40090a 3605 struct seq_net_private p;
1da177e4 3606 int bucket;
1d578303 3607 int offset;
1da177e4
LT		 3608};
3609
1d578303 3610static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos)
1da177e4
LT		 3611{
3612 struct inet6_ifaddr *ifa = NULL;
3613 struct if6_iter_state *state = seq->private;
1218854a 3614 struct net *net = seq_file_net(seq);
1d578303 3615 int p = 0;
1da177e4 3616
1d578303
MM		 3617 /* initial bucket if pos is 0 */
3618 if (pos == 0) {
3619 state->bucket = 0;
3620 state->offset = 0;
3621 }
3622
3623 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
b67bfe0d 3624 hlist_for_each_entry_rcu_bh(ifa, &inet6_addr_lst[state->bucket],
1d578303 3625 addr_lst) {
9f0d3c27
ED		 3626 if (!net_eq(dev_net(ifa->idev->dev), net))
3627 continue;
1d578303
MM		 3628 /* sync with offset */
3629 if (p < state->offset) {
3630 p++;
3631 continue;
3632 }
3633 state->offset++;
9f0d3c27 3634 return ifa;
1d578303
MM		 3635 }
3636
3637 /* prepare for next bucket */
3638 state->offset = 0;
3639 p = 0;
1da177e4 3640 }
c2e21293 3641 return NULL;
1da177e4
LT		 3642}
3643
c2e21293 3644static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
3645 struct inet6_ifaddr *ifa)
1da177e4
LT		 3646{
3647 struct if6_iter_state *state = seq->private;
1218854a 3648 struct net *net = seq_file_net(seq);
1da177e4 3649
b67bfe0d 3650 hlist_for_each_entry_continue_rcu_bh(ifa, addr_lst) {
9f0d3c27
ED		 3651 if (!net_eq(dev_net(ifa->idev->dev), net))
3652 continue;
1d578303 3653 state->offset++;
9f0d3c27 3654 return ifa;
1d578303 3655 }
3c40090a 3656
c2e21293 3657 while (++state->bucket < IN6_ADDR_HSIZE) {
1d578303 3658 state->offset = 0;
b67bfe0d 3659 hlist_for_each_entry_rcu_bh(ifa,
c2e21293 3660 &inet6_addr_lst[state->bucket], addr_lst) {
9f0d3c27
ED		 3661 if (!net_eq(dev_net(ifa->idev->dev), net))
3662 continue;
1d578303 3663 state->offset++;
9f0d3c27 3664 return ifa;
c2e21293 3665 }
1da177e4 3666 }
3c40090a 3667
c2e21293 3668 return NULL;
1da177e4
LT		 3669}
3670
1da177e4 3671static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
4f70ecca 3672 __acquires(rcu_bh)
1da177e4 3673{
5c578aed 3674 rcu_read_lock_bh();
1d578303 3675 return if6_get_first(seq, *pos);
1da177e4
LT		 3676}
3677
3678static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3679{
3680 struct inet6_ifaddr *ifa;
3681
3682 ifa = if6_get_next(seq, v);
3683 ++*pos;
3684 return ifa;
3685}
3686
3687static void if6_seq_stop(struct seq_file *seq, void *v)
4f70ecca 3688 __releases(rcu_bh)
1da177e4 3689{
5c578aed 3690 rcu_read_unlock_bh();
1da177e4
LT		 3691}
3692
3693static int if6_seq_show(struct seq_file *seq, void *v)
3694{
3695 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
971a351c 3696 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
b071195d 3697 &ifp->addr,
1da177e4
LT		 3698 ifp->idev->dev->ifindex,
3699 ifp->prefix_len,
3700 ifp->scope,
971a351c 3701 (u8) ifp->flags,
1da177e4
LT		 3702 ifp->idev->dev->name);
3703 return 0;
3704}
3705
56b3d975 3706static const struct seq_operations if6_seq_ops = {
1da177e4
LT		 3707 .start = if6_seq_start,
3708 .next = if6_seq_next,
3709 .show = if6_seq_show,
3710 .stop = if6_seq_stop,
3711};
3712
3713static int if6_seq_open(struct inode *inode, struct file *file)
3714{
3c40090a
DL		 3715 return seq_open_net(inode, file, &if6_seq_ops,
3716 sizeof(struct if6_iter_state));
1da177e4
LT		 3717}
3718
9a32144e 3719static const struct file_operations if6_fops = {
1da177e4
LT		 3720 .owner = THIS_MODULE,
3721 .open = if6_seq_open,
3722 .read = seq_read,
3723 .llseek = seq_lseek,
3c40090a 3724 .release = seq_release_net,
1da177e4
LT		 3725};
3726
2c8c1e72 3727static int __net_init if6_proc_net_init(struct net *net)
1da177e4 3728{
d4beaa66 3729 if (!proc_create("if_inet6", S_IRUGO, net->proc_net, &if6_fops))
1da177e4
LT		 3730 return -ENOMEM;
3731 return 0;
3732}
3733
2c8c1e72 3734static void __net_exit if6_proc_net_exit(struct net *net)
3c40090a 3735{
ece31ffd 3736 remove_proc_entry("if_inet6", net->proc_net);
3c40090a
DL		 3737}
3738
3739static struct pernet_operations if6_proc_net_ops = {
67ba4152
IM		 3740 .init = if6_proc_net_init,
3741 .exit = if6_proc_net_exit,
3c40090a
DL		 3742};
3743
3744int __init if6_proc_init(void)
3745{
3746 return register_pernet_subsys(&if6_proc_net_ops);
3747}
3748
1da177e4
LT		 3749void if6_proc_exit(void)
3750{
3c40090a 3751 unregister_pernet_subsys(&if6_proc_net_ops);
1da177e4
LT		 3752}
3753#endif /* CONFIG_PROC_FS */
3754
07a93626 3755#if IS_ENABLED(CONFIG_IPV6_MIP6)
3b9f9a1c 3756/* Check if address is a home address configured on any interface. */
b71d1d42 3757int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr)
3b9f9a1c
NT		 3758{
3759 int ret = 0;
c2e21293 3760 struct inet6_ifaddr *ifp = NULL;
ddbe5032 3761 unsigned int hash = inet6_addr_hash(addr);
c2e21293 3762
5c578aed 3763 rcu_read_lock_bh();
b67bfe0d 3764 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
878628fb 3765 if (!net_eq(dev_net(ifp->idev->dev), net))
389f6612 3766 continue;
caad295f 3767 if (ipv6_addr_equal(&ifp->addr, addr) &&
3b9f9a1c
NT		 3768 (ifp->flags & IFA_F_HOMEADDRESS)) {
3769 ret = 1;
3770 break;
3771 }
3772 }
5c578aed 3773 rcu_read_unlock_bh();
3b9f9a1c
NT		 3774 return ret;
3775}
3776#endif
3777
1da177e4
LT		 3778/*
3779 * Periodic address status verification
3780 */
3781
c15b1cca 3782static void addrconf_verify_rtnl(void)
1da177e4 3783{
b2db7564 3784 unsigned long now, next, next_sec, next_sched;
1da177e4 3785 struct inet6_ifaddr *ifp;
1da177e4
LT		 3786 int i;
3787
c15b1cca
HFS		 3788 ASSERT_RTNL();
3789
5c578aed 3790 rcu_read_lock_bh();
1da177e4 3791 now = jiffies;
b2db7564 3792 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
1da177e4 3793
c15b1cca 3794 cancel_delayed_work(&addr_chk_work);
1da177e4 3795
bcdd553f 3796 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
1da177e4 3797restart:
c15b1cca 3798 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[i], addr_lst) {
1da177e4 3799 unsigned long age;
1da177e4 3800
fad8da3e
YA		 3801 /* When setting preferred_lft to a value not zero or
3802 * infinity, while valid_lft is infinity
3803 * IFA_F_PERMANENT has a non-infinity life time.
3804 */
3805 if ((ifp->flags & IFA_F_PERMANENT) &&
3806 (ifp->prefered_lft == INFINITY_LIFE_TIME))
1da177e4
LT		 3807 continue;
3808
3809 spin_lock(&ifp->lock);
b2db7564
YH		 3810 /* We try to batch several events at once. */
3811 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
1da177e4 3812
8f27ebb9
YH		 3813 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
3814 age >= ifp->valid_lft) {
1da177e4
LT		 3815 spin_unlock(&ifp->lock);
3816 in6_ifa_hold(ifp);
1da177e4
LT		 3817 ipv6_del_addr(ifp);
3818 goto restart;
8f27ebb9
YH		 3819 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
3820 spin_unlock(&ifp->lock);
3821 continue;
1da177e4 3822 } else if (age >= ifp->prefered_lft) {
a1ed0526 3823 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
1da177e4
LT		 3824 int deprecate = 0;
3825
3826 if (!(ifp->flags&IFA_F_DEPRECATED)) {
3827 deprecate = 1;
3828 ifp->flags |= IFA_F_DEPRECATED;
3829 }
3830
fad8da3e
YA		 3831 if ((ifp->valid_lft != INFINITY_LIFE_TIME) &&
3832 (time_before(ifp->tstamp + ifp->valid_lft * HZ, next)))
1da177e4
LT		 3833 next = ifp->tstamp + ifp->valid_lft * HZ;
3834
3835 spin_unlock(&ifp->lock);
3836
3837 if (deprecate) {
3838 in6_ifa_hold(ifp);
1da177e4
LT		 3839
3840 ipv6_ifa_notify(0, ifp);
3841 in6_ifa_put(ifp);
3842 goto restart;
3843 }
1da177e4
LT		 3844 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
3845 !(ifp->flags&IFA_F_TENTATIVE)) {
88949cf4 3846 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
3847 ifp->idev->cnf.dad_transmits *
1f9248e5 3848 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME) / HZ;
88949cf4 3849
1da177e4
LT		 3850 if (age >= ifp->prefered_lft - regen_advance) {
3851 struct inet6_ifaddr *ifpub = ifp->ifpub;
3852 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3853 next = ifp->tstamp + ifp->prefered_lft * HZ;
3854 if (!ifp->regen_count && ifpub) {
3855 ifp->regen_count++;
3856 in6_ifa_hold(ifp);
3857 in6_ifa_hold(ifpub);
3858 spin_unlock(&ifp->lock);
5c578aed 3859
291d809b
HY		 3860 spin_lock(&ifpub->lock);
3861 ifpub->regen_count = 0;
3862 spin_unlock(&ifpub->lock);
1da177e4
LT		 3863 ipv6_create_tempaddr(ifpub, ifp);
3864 in6_ifa_put(ifpub);
3865 in6_ifa_put(ifp);
3866 goto restart;
3867 }
3868 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
3869 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
3870 spin_unlock(&ifp->lock);
1da177e4
LT		 3871 } else {
3872 /* ifp->prefered_lft <= ifp->valid_lft */
3873 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3874 next = ifp->tstamp + ifp->prefered_lft * HZ;
3875 spin_unlock(&ifp->lock);
3876 }
3877 }
1da177e4
LT		 3878 }
3879
b2db7564
YH		 3880 next_sec = round_jiffies_up(next);
3881 next_sched = next;
3882
3883 /* If rounded timeout is accurate enough, accept it. */
3884 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
3885 next_sched = next_sec;
3886
3887 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
3888 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
3889 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
3890
ba3542e1 3891 ADBG(KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
3892 now, next, next_sec, next_sched);
c15b1cca 3893 mod_delayed_work(addrconf_wq, &addr_chk_work, next_sched - now);
5c578aed 3894 rcu_read_unlock_bh();
1da177e4
LT		 3895}
3896
c15b1cca
HFS		 3897static void addrconf_verify_work(struct work_struct *w)
3898{
3899 rtnl_lock();
3900 addrconf_verify_rtnl();
3901 rtnl_unlock();
3902}
3903
3904static void addrconf_verify(void)
3905{
3906 mod_delayed_work(addrconf_wq, &addr_chk_work, 0);
3907}
3908
caeaba79
ND		 3909static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local,
3910 struct in6_addr **peer_pfx)
461d8837
TG		 3911{
3912 struct in6_addr *pfx = NULL;
3913
caeaba79
ND		 3914 *peer_pfx = NULL;
3915
461d8837
TG		 3916 if (addr)
3917 pfx = nla_data(addr);
3918
3919 if (local) {
3920 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
caeaba79
ND		 3921 *peer_pfx = pfx;
3922 pfx = nla_data(local);
461d8837
TG		 3923 }
3924
3925 return pfx;
3926}
3927
ef7c79ed 3928static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
461d8837
TG		 3929 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
3930 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
3931 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
479840ff 3932 [IFA_FLAGS] = { .len = sizeof(u32) },
461d8837
TG		 3933};
3934
1da177e4 3935static int
661d2967 3936inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh)
1da177e4 3937{
3b1e0a65 3938 struct net *net = sock_net(skb->sk);
b933f716
TG		 3939 struct ifaddrmsg *ifm;
3940 struct nlattr *tb[IFA_MAX+1];
caeaba79 3941 struct in6_addr *pfx, *peer_pfx;
6046d5b4 3942 u32 ifa_flags;
b933f716 3943 int err;
1da177e4 3944
b933f716
TG		 3945 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3946 if (err < 0)
3947 return err;
3948
3949 ifm = nlmsg_data(nlh);
caeaba79 3950 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
1da177e4
LT		 3951 if (pfx == NULL)
3952 return -EINVAL;
3953
6046d5b4
HK		 3954 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
3955
3956 /* We ignore other flags so far. */
3957 ifa_flags &= IFA_F_MANAGETEMPADDR;
3958
3959 return inet6_addr_del(net, ifm->ifa_index, ifa_flags, pfx,
3960 ifm->ifa_prefixlen);
1da177e4
LT		 3961}
3962
479840ff 3963static int inet6_addr_modify(struct inet6_ifaddr *ifp, u32 ifa_flags,
55ebaef1 3964 u32 prefered_lft, u32 valid_lft)
081bba5b 3965{
6f704992
YH		 3966 u32 flags;
3967 clock_t expires;
4bed72e4 3968 unsigned long timeout;
53bd6749 3969 bool was_managetempaddr;
5b84efec 3970 bool had_prefixroute;
46d48046 3971
c15b1cca
HFS		 3972 ASSERT_RTNL();
3973
081bba5b
NT		 3974 if (!valid_lft || (prefered_lft > valid_lft))
3975 return -EINVAL;
3976
53bd6749
JP		 3977 if (ifa_flags & IFA_F_MANAGETEMPADDR &&
3978 (ifp->flags & IFA_F_TEMPORARY || ifp->prefix_len != 64))
3979 return -EINVAL;
3980
4bed72e4
YH		 3981 timeout = addrconf_timeout_fixup(valid_lft, HZ);
3982 if (addrconf_finite_timeout(timeout)) {
3983 expires = jiffies_to_clock_t(timeout * HZ);
3984 valid_lft = timeout;
6f704992 3985 flags = RTF_EXPIRES;
4bed72e4
YH		 3986 } else {
3987 expires = 0;
3988 flags = 0;
3989 ifa_flags |= IFA_F_PERMANENT;
6f704992 3990 }
081bba5b 3991
4bed72e4
YH		 3992 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
3993 if (addrconf_finite_timeout(timeout)) {
3994 if (timeout == 0)
3995 ifa_flags |= IFA_F_DEPRECATED;
3996 prefered_lft = timeout;
3997 }
081bba5b
NT		 3998
3999 spin_lock_bh(&ifp->lock);
53bd6749 4000 was_managetempaddr = ifp->flags & IFA_F_MANAGETEMPADDR;
5b84efec
TH		 4001 had_prefixroute = ifp->flags & IFA_F_PERMANENT &&
4002 !(ifp->flags & IFA_F_NOPREFIXROUTE);
53bd6749 4003 ifp->flags &= ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD |
761aac73
TH		 4004 IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
4005 IFA_F_NOPREFIXROUTE);
53bd6749 4006 ifp->flags |= ifa_flags;
081bba5b
NT		 4007 ifp->tstamp = jiffies;
4008 ifp->valid_lft = valid_lft;
4009 ifp->prefered_lft = prefered_lft;
4010
4011 spin_unlock_bh(&ifp->lock);
4012 if (!(ifp->flags&IFA_F_TENTATIVE))
4013 ipv6_ifa_notify(0, ifp);
081bba5b 4014
761aac73
TH		 4015 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) {
4016 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
4017 expires, flags);
5b84efec
TH		 4018 } else if (had_prefixroute) {
4019 enum cleanup_prefix_rt_t action;
4020 unsigned long rt_expires;
4021
4022 write_lock_bh(&ifp->idev->lock);
4023 action = check_cleanup_prefix_route(ifp, &rt_expires);
4024 write_unlock_bh(&ifp->idev->lock);
4025
4026 if (action != CLEANUP_PREFIX_RT_NOP) {
4027 cleanup_prefix_route(ifp, rt_expires,
4028 action == CLEANUP_PREFIX_RT_DEL);
4029 }
761aac73 4030 }
53bd6749
JP		 4031
4032 if (was_managetempaddr || ifp->flags & IFA_F_MANAGETEMPADDR) {
4033 if (was_managetempaddr && !(ifp->flags & IFA_F_MANAGETEMPADDR))
4034 valid_lft = prefered_lft = 0;
4035 manage_tempaddrs(ifp->idev, ifp, valid_lft, prefered_lft,
4036 !was_managetempaddr, jiffies);
4037 }
4038
c15b1cca 4039 addrconf_verify_rtnl();
081bba5b
NT		 4040
4041 return 0;
4042}
4043
1da177e4 4044static int
661d2967 4045inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh)
1da177e4 4046{
3b1e0a65 4047 struct net *net = sock_net(skb->sk);
461d8837
TG		 4048 struct ifaddrmsg *ifm;
4049 struct nlattr *tb[IFA_MAX+1];
caeaba79 4050 struct in6_addr *pfx, *peer_pfx;
7198f8ce
TG		 4051 struct inet6_ifaddr *ifa;
4052 struct net_device *dev;
55ebaef1 4053 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
479840ff 4054 u32 ifa_flags;
461d8837 4055 int err;
1da177e4 4056
461d8837
TG		 4057 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
4058 if (err < 0)
4059 return err;
4060
4061 ifm = nlmsg_data(nlh);
caeaba79 4062 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
1da177e4
LT		 4063 if (pfx == NULL)
4064 return -EINVAL;
4065
461d8837 4066 if (tb[IFA_CACHEINFO]) {
0778769d 4067 struct ifa_cacheinfo *ci;
461d8837
TG		 4068
4069 ci = nla_data(tb[IFA_CACHEINFO]);
0778769d 4070 valid_lft = ci->ifa_valid;
461d8837
TG		 4071 preferred_lft = ci->ifa_prefered;
4072 } else {
4073 preferred_lft = INFINITY_LIFE_TIME;
4074 valid_lft = INFINITY_LIFE_TIME;
0778769d
NT		 4075 }
4076
af284937 4077 dev = __dev_get_by_index(net, ifm->ifa_index);
7198f8ce
TG		 4078 if (dev == NULL)
4079 return -ENODEV;
4080
479840ff
JP		 4081 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
4082
55ebaef1 4083 /* We ignore other flags so far. */
761aac73 4084 ifa_flags &= IFA_F_NODAD | IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
93a714d6 4085 IFA_F_NOPREFIXROUTE | IFA_F_MCAUTOJOIN;
55ebaef1 4086
1cab3da6 4087 ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
7198f8ce
TG		 4088 if (ifa == NULL) {
4089 /*
4090 * It would be best to check for !NLM_F_CREATE here but
db9c7c39 4091 * userspace already relies on not having to provide this.
7198f8ce 4092 */
caeaba79 4093 return inet6_addr_add(net, ifm->ifa_index, pfx, peer_pfx,
af284937
DL		 4094 ifm->ifa_prefixlen, ifa_flags,
4095 preferred_lft, valid_lft);
081bba5b
NT		 4096 }
4097
7198f8ce
TG		 4098 if (nlh->nlmsg_flags & NLM_F_EXCL ||
4099 !(nlh->nlmsg_flags & NLM_F_REPLACE))
4100 err = -EEXIST;
4101 else
55ebaef1 4102 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
7198f8ce
TG		 4103
4104 in6_ifa_put(ifa);
4105
4106 return err;
1da177e4
LT		 4107}
4108
479840ff 4109static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u32 flags,
101bb229
TG		 4110 u8 scope, int ifindex)
4111{
4112 struct ifaddrmsg *ifm;
4113
4114 ifm = nlmsg_data(nlh);
4115 ifm->ifa_family = AF_INET6;
4116 ifm->ifa_prefixlen = prefixlen;
4117 ifm->ifa_flags = flags;
4118 ifm->ifa_scope = scope;
4119 ifm->ifa_index = ifindex;
4120}
4121
85486af0
TG		 4122static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
4123 unsigned long tstamp, u32 preferred, u32 valid)
4124{
4125 struct ifa_cacheinfo ci;
4126
18a31e1e
TG		 4127 ci.cstamp = cstamp_delta(cstamp);
4128 ci.tstamp = cstamp_delta(tstamp);
85486af0
TG		 4129 ci.ifa_prefered = preferred;
4130 ci.ifa_valid = valid;
4131
4132 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
4133}
4134
101bb229
TG		 4135static inline int rt_scope(int ifa_scope)
4136{
4137 if (ifa_scope & IFA_HOST)
4138 return RT_SCOPE_HOST;
4139 else if (ifa_scope & IFA_LINK)
4140 return RT_SCOPE_LINK;
4141 else if (ifa_scope & IFA_SITE)
4142 return RT_SCOPE_SITE;
4143 else
4144 return RT_SCOPE_UNIVERSE;
4145}
4146
0ab6803b
TG		 4147static inline int inet6_ifaddr_msgsize(void)
4148{
339bf98f 4149 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
caeaba79 4150 + nla_total_size(16) /* IFA_LOCAL */
339bf98f 4151 + nla_total_size(16) /* IFA_ADDRESS */
479840ff
JP		 4152 + nla_total_size(sizeof(struct ifa_cacheinfo))
4153 + nla_total_size(4) /* IFA_FLAGS */;
0ab6803b 4154}
c5396a31 4155
1da177e4 4156static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
15e47304 4157 u32 portid, u32 seq, int event, unsigned int flags)
1da177e4 4158{
1da177e4 4159 struct nlmsghdr *nlh;
85486af0 4160 u32 preferred, valid;
1da177e4 4161
15e47304 4162 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
0ab6803b 4163 if (nlh == NULL)
26932566 4164 return -EMSGSIZE;
0ab6803b 4165
101bb229
TG		 4166 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
4167 ifa->idev->dev->ifindex);
4168
fad8da3e
YA		 4169 if (!((ifa->flags&IFA_F_PERMANENT) &&
4170 (ifa->prefered_lft == INFINITY_LIFE_TIME))) {
85486af0
TG		 4171 preferred = ifa->prefered_lft;
4172 valid = ifa->valid_lft;
4173 if (preferred != INFINITY_LIFE_TIME) {
1da177e4 4174 long tval = (jiffies - ifa->tstamp)/HZ;
a1faa698
JR		 4175 if (preferred > tval)
4176 preferred -= tval;
4177 else
4178 preferred = 0;
f56619fc
BH		 4179 if (valid != INFINITY_LIFE_TIME) {
4180 if (valid > tval)
4181 valid -= tval;
4182 else
4183 valid = 0;
4184 }
1da177e4
LT		 4185 }
4186 } else {
85486af0
TG		 4187 preferred = INFINITY_LIFE_TIME;
4188 valid = INFINITY_LIFE_TIME;
4189 }
4190
7996c799 4191 if (!ipv6_addr_any(&ifa->peer_addr)) {
caeaba79
ND		 4192 if (nla_put(skb, IFA_LOCAL, 16, &ifa->addr) < 0 ||
4193 nla_put(skb, IFA_ADDRESS, 16, &ifa->peer_addr) < 0)
4194 goto error;
4195 } else
4196 if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0)
4197 goto error;
4198
4199 if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0)
4200 goto error;
1da177e4 4201
479840ff
JP		 4202 if (nla_put_u32(skb, IFA_FLAGS, ifa->flags) < 0)
4203 goto error;
4204
053c095a
JB		 4205 nlmsg_end(skb, nlh);
4206 return 0;
caeaba79
ND		 4207
4208error:
4209 nlmsg_cancel(skb, nlh);
4210 return -EMSGSIZE;
1da177e4
LT		 4211}
4212
4213static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
15e47304 4214 u32 portid, u32 seq, int event, u16 flags)
1da177e4 4215{
1da177e4 4216 struct nlmsghdr *nlh;
101bb229
TG		 4217 u8 scope = RT_SCOPE_UNIVERSE;
4218 int ifindex = ifmca->idev->dev->ifindex;
4219
4220 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
4221 scope = RT_SCOPE_SITE;
1da177e4 4222
15e47304 4223 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
0ab6803b 4224 if (nlh == NULL)
26932566 4225 return -EMSGSIZE;
85486af0 4226
0ab6803b
TG		 4227 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
4228 if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 ||
4229 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
26932566
PM		 4230 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
4231 nlmsg_cancel(skb, nlh);
4232 return -EMSGSIZE;
4233 }
85486af0 4234
053c095a
JB		 4235 nlmsg_end(skb, nlh);
4236 return 0;
1da177e4
LT		 4237}
4238
4239static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
15e47304 4240 u32 portid, u32 seq, int event, unsigned int flags)
1da177e4 4241{
1da177e4 4242 struct nlmsghdr *nlh;
101bb229
TG		 4243 u8 scope = RT_SCOPE_UNIVERSE;
4244 int ifindex = ifaca->aca_idev->dev->ifindex;
4245
4246 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
4247 scope = RT_SCOPE_SITE;
1da177e4 4248
15e47304 4249 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
0ab6803b 4250 if (nlh == NULL)
26932566 4251 return -EMSGSIZE;
85486af0 4252
0ab6803b
TG		 4253 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
4254 if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 ||
4255 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
26932566
PM		 4256 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
4257 nlmsg_cancel(skb, nlh);
4258 return -EMSGSIZE;
4259 }
1da177e4 4260
053c095a
JB		 4261 nlmsg_end(skb, nlh);
4262 return 0;
1da177e4
LT		 4263}
4264
e21e8467 4265enum addr_type_t {
1da177e4
LT		 4266 UNICAST_ADDR,
4267 MULTICAST_ADDR,
4268 ANYCAST_ADDR,
4269};
4270
234b27c3
ED		 4271/* called with rcu_read_lock() */
4272static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
4273 struct netlink_callback *cb, enum addr_type_t type,
4274 int s_ip_idx, int *p_ip_idx)
4275{
234b27c3
ED		 4276 struct ifmcaddr6 *ifmca;
4277 struct ifacaddr6 *ifaca;
4278 int err = 1;
4279 int ip_idx = *p_ip_idx;
4280
4281 read_lock_bh(&idev->lock);
4282 switch (type) {
502a2ffd 4283 case UNICAST_ADDR: {
4284 struct inet6_ifaddr *ifa;
4285
234b27c3 4286 /* unicast address incl. temp addr */
502a2ffd 4287 list_for_each_entry(ifa, &idev->addr_list, if_list) {
4288 if (++ip_idx < s_ip_idx)
234b27c3
ED		 4289 continue;
4290 err = inet6_fill_ifaddr(skb, ifa,
15e47304 4291 NETLINK_CB(cb->skb).portid,
234b27c3
ED		 4292 cb->nlh->nlmsg_seq,
4293 RTM_NEWADDR,
4294 NLM_F_MULTI);
053c095a 4295 if (err < 0)
234b27c3 4296 break;
63998ac2 4297 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
234b27c3
ED		 4298 }
4299 break;
502a2ffd 4300 }
234b27c3
ED		 4301 case MULTICAST_ADDR:
4302 /* multicast address */
4303 for (ifmca = idev->mc_list; ifmca;
4304 ifmca = ifmca->next, ip_idx++) {
4305 if (ip_idx < s_ip_idx)
4306 continue;
4307 err = inet6_fill_ifmcaddr(skb, ifmca,
15e47304 4308 NETLINK_CB(cb->skb).portid,
234b27c3
ED		 4309 cb->nlh->nlmsg_seq,
4310 RTM_GETMULTICAST,
4311 NLM_F_MULTI);
053c095a 4312 if (err < 0)
234b27c3
ED		 4313 break;
4314 }
4315 break;
4316 case ANYCAST_ADDR:
4317 /* anycast address */
4318 for (ifaca = idev->ac_list; ifaca;
4319 ifaca = ifaca->aca_next, ip_idx++) {
4320 if (ip_idx < s_ip_idx)
4321 continue;
4322 err = inet6_fill_ifacaddr(skb, ifaca,
15e47304 4323 NETLINK_CB(cb->skb).portid,
234b27c3
ED		 4324 cb->nlh->nlmsg_seq,
4325 RTM_GETANYCAST,
4326 NLM_F_MULTI);
053c095a 4327 if (err < 0)
234b27c3
ED		 4328 break;
4329 }
4330 break;
4331 default:
4332 break;
4333 }
4334 read_unlock_bh(&idev->lock);
4335 *p_ip_idx = ip_idx;
4336 return err;
4337}
4338
1da177e4
LT		 4339static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
4340 enum addr_type_t type)
4341{
234b27c3
ED		 4342 struct net *net = sock_net(skb->sk);
4343 int h, s_h;
1da177e4
LT		 4344 int idx, ip_idx;
4345 int s_idx, s_ip_idx;
1da177e4 4346 struct net_device *dev;
234b27c3
ED		 4347 struct inet6_dev *idev;
4348 struct hlist_head *head;
1ab1457c 4349
234b27c3
ED		 4350 s_h = cb->args[0];
4351 s_idx = idx = cb->args[1];
4352 s_ip_idx = ip_idx = cb->args[2];
5d5619b4 4353
234b27c3 4354 rcu_read_lock();
63998ac2 4355 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ net->dev_base_seq;
234b27c3
ED		 4356 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4357 idx = 0;
4358 head = &net->dev_index_head[h];
b67bfe0d 4359 hlist_for_each_entry_rcu(dev, head, index_hlist) {
234b27c3
ED		 4360 if (idx < s_idx)
4361 goto cont;
4b97efdf 4362 if (h > s_h || idx > s_idx)
234b27c3
ED		 4363 s_ip_idx = 0;
4364 ip_idx = 0;
e21e8467
SH		 4365 idev = __in6_dev_get(dev);
4366 if (!idev)
234b27c3
ED		 4367 goto cont;
4368
4369 if (in6_dump_addrs(idev, skb, cb, type,
7b46a644 4370 s_ip_idx, &ip_idx) < 0)
234b27c3 4371 goto done;
7562f876 4372cont:
234b27c3
ED		 4373 idx++;
4374 }
1da177e4 4375 }
234b27c3
ED		 4376done:
4377 rcu_read_unlock();
4378 cb->args[0] = h;
4379 cb->args[1] = idx;
4380 cb->args[2] = ip_idx;
4381
1da177e4
LT		 4382 return skb->len;
4383}
4384
4385static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
4386{
4387 enum addr_type_t type = UNICAST_ADDR;
b854272b 4388
1da177e4
LT		 4389 return inet6_dump_addr(skb, cb, type);
4390}
4391
4392static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
4393{
4394 enum addr_type_t type = MULTICAST_ADDR;
b854272b 4395
1da177e4
LT		 4396 return inet6_dump_addr(skb, cb, type);
4397}
4398
4399
4400static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
4401{
4402 enum addr_type_t type = ANYCAST_ADDR;
b854272b 4403
1da177e4
LT		 4404 return inet6_dump_addr(skb, cb, type);
4405}
4406
661d2967 4407static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh)
6c223828 4408{
3b1e0a65 4409 struct net *net = sock_net(in_skb->sk);
1b29fc2c
TG		 4410 struct ifaddrmsg *ifm;
4411 struct nlattr *tb[IFA_MAX+1];
caeaba79 4412 struct in6_addr *addr = NULL, *peer;
6c223828
NT		 4413 struct net_device *dev = NULL;
4414 struct inet6_ifaddr *ifa;
4415 struct sk_buff *skb;
6c223828
NT		 4416 int err;
4417
1b29fc2c
TG		 4418 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
4419 if (err < 0)
4420 goto errout;
4421
caeaba79 4422 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer);
1b29fc2c
TG		 4423 if (addr == NULL) {
4424 err = -EINVAL;
4425 goto errout;
6c223828 4426 }
6c223828 4427
1b29fc2c 4428 ifm = nlmsg_data(nlh);
6c223828 4429 if (ifm->ifa_index)
6fda7350 4430 dev = __dev_get_by_index(net, ifm->ifa_index);
6c223828 4431
e21e8467
SH		 4432 ifa = ipv6_get_ifaddr(net, addr, dev, 1);
4433 if (!ifa) {
1b29fc2c
TG		 4434 err = -EADDRNOTAVAIL;
4435 goto errout;
4436 }
6c223828 4437
e21e8467
SH		 4438 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
4439 if (!skb) {
6c223828 4440 err = -ENOBUFS;
1b29fc2c 4441 goto errout_ifa;
6c223828
NT		 4442 }
4443
15e47304 4444 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).portid,
6c223828 4445 nlh->nlmsg_seq, RTM_NEWADDR, 0);
26932566
PM		 4446 if (err < 0) {
4447 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4448 WARN_ON(err == -EMSGSIZE);
4449 kfree_skb(skb);
4450 goto errout_ifa;
4451 }
15e47304 4452 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
1b29fc2c 4453errout_ifa:
6c223828 4454 in6_ifa_put(ifa);
1b29fc2c 4455errout:
6c223828 4456 return err;
6c223828
NT		 4457}
4458
1da177e4
LT		 4459static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
4460{
4461 struct sk_buff *skb;
c346dca1 4462 struct net *net = dev_net(ifa->idev->dev);
5d620266 4463 int err = -ENOBUFS;
1da177e4 4464
0ab6803b 4465 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
5d620266
TG		 4466 if (skb == NULL)
4467 goto errout;
4468
4469 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
26932566
PM		 4470 if (err < 0) {
4471 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4472 WARN_ON(err == -EMSGSIZE);
4473 kfree_skb(skb);
4474 goto errout;
4475 }
1ce85fe4
PNA		 4476 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
4477 return;
5d620266
TG		 4478errout:
4479 if (err < 0)
6fda7350 4480 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
1da177e4
LT		 4481}
4482
b6f99a21 4483static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
1da177e4
LT		 4484 __s32 *array, int bytes)
4485{
04561c1f
TG		 4486 BUG_ON(bytes < (DEVCONF_MAX * 4));
4487
1da177e4
LT		 4488 memset(array, 0, bytes);
4489 array[DEVCONF_FORWARDING] = cnf->forwarding;
4490 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
4491 array[DEVCONF_MTU6] = cnf->mtu6;
4492 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
4493 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
4494 array[DEVCONF_AUTOCONF] = cnf->autoconf;
4495 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
4496 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
93908d19
TG		 4497 array[DEVCONF_RTR_SOLICIT_INTERVAL] =
4498 jiffies_to_msecs(cnf->rtr_solicit_interval);
4499 array[DEVCONF_RTR_SOLICIT_DELAY] =
4500 jiffies_to_msecs(cnf->rtr_solicit_delay);
1da177e4 4501 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
fc4eba58
HFS		 4502 array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] =
4503 jiffies_to_msecs(cnf->mldv1_unsolicited_report_interval);
4504 array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] =
4505 jiffies_to_msecs(cnf->mldv2_unsolicited_report_interval);
1da177e4
LT		 4506 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
4507 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
4508 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
4509 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
4510 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
1da177e4 4511 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
65f5c7c1 4512 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
c4fd30eb 4513 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
930d6ff2
YH		 4514#ifdef CONFIG_IPV6_ROUTER_PREF
4515 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
93908d19
TG		 4516 array[DEVCONF_RTR_PROBE_INTERVAL] =
4517 jiffies_to_msecs(cnf->rtr_probe_interval);
fa03ef38 4518#ifdef CONFIG_IPV6_ROUTE_INFO
09c884d4
YH		 4519 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
4520#endif
930d6ff2 4521#endif
fbea49e1 4522 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
0bcbc926 4523 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
95c385b4
NH		 4524#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4525 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
7fd2561e 4526 array[DEVCONF_USE_OPTIMISTIC] = cnf->use_optimistic;
95c385b4 4527#endif
7bc570c8
YH		 4528#ifdef CONFIG_IPV6_MROUTE
4529 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
4530#endif
778d80be 4531 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
1b34be74 4532 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
c3faca05 4533 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
5cb04436 4534 array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify;
b800c3b9 4535 array[DEVCONF_SUPPRESS_FRAG_NDISC] = cnf->suppress_frag_ndisc;
d9333196 4536 array[DEVCONF_ACCEPT_RA_FROM_LOCAL] = cnf->accept_ra_from_local;
c2943f14 4537 array[DEVCONF_ACCEPT_RA_MTU] = cnf->accept_ra_mtu;
3d1bec99 4538 /* we omit DEVCONF_STABLE_SECRET for now */
1da177e4
LT		 4539}
4540
b382b191
TG		 4541static inline size_t inet6_ifla6_size(void)
4542{
4543 return nla_total_size(4) /* IFLA_INET6_FLAGS */
4544 + nla_total_size(sizeof(struct ifla_cacheinfo))
4545 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
4546 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
f53adae4
DB		 4547 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
4548 + nla_total_size(sizeof(struct in6_addr)); /* IFLA_INET6_TOKEN */
b382b191
TG		 4549}
4550
339bf98f
TG		 4551static inline size_t inet6_if_nlmsg_size(void)
4552{
4553 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
4554 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
4555 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
4556 + nla_total_size(4) /* IFLA_MTU */
4557 + nla_total_size(4) /* IFLA_LINK */
b382b191 4558 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */
339bf98f 4559}
c5396a31 4560
be281e55 4561static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib,
7d720c3e 4562 int items, int bytes)
7f7d9a6b
HX		 4563{
4564 int i;
4565 int pad = bytes - sizeof(u64) * items;
4566 BUG_ON(pad < 0);
4567
4568 /* Use put_unaligned() because stats may not be aligned for u64. */
4569 put_unaligned(items, &stats[0]);
4570 for (i = 1; i < items; i++)
be281e55 4571 put_unaligned(atomic_long_read(&mib[i]), &stats[i]);
7f7d9a6b
HX		 4572
4573 memset(&stats[items], 0, pad);
4574}
4575
698365fa 4576static inline void __snmp6_fill_stats64(u64 *stats, void __percpu *mib,
4ce3c183
ED		 4577 int items, int bytes, size_t syncpoff)
4578{
4579 int i;
4580 int pad = bytes - sizeof(u64) * items;
4581 BUG_ON(pad < 0);
4582
4583 /* Use put_unaligned() because stats may not be aligned for u64. */
4584 put_unaligned(items, &stats[0]);
4585 for (i = 1; i < items; i++)
4586 put_unaligned(snmp_fold_field64(mib, i, syncpoff), &stats[i]);
4587
4588 memset(&stats[items], 0, pad);
4589}
4590
7f7d9a6b
HX		 4591static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
4592 int bytes)
4593{
e21e8467 4594 switch (attrtype) {
7f7d9a6b 4595 case IFLA_INET6_STATS:
698365fa 4596 __snmp6_fill_stats64(stats, idev->stats.ipv6,
4ce3c183 4597 IPSTATS_MIB_MAX, bytes, offsetof(struct ipstats_mib, syncp));
7f7d9a6b
HX		 4598 break;
4599 case IFLA_INET6_ICMP6STATS:
be281e55 4600 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, ICMP6_MIB_MAX, bytes);
7f7d9a6b
HX		 4601 break;
4602 }
4603}
4604
b382b191
TG		 4605static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev)
4606{
4607 struct nlattr *nla;
4608 struct ifla_cacheinfo ci;
4609
c78679e8
DM		 4610 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags))
4611 goto nla_put_failure;
b382b191 4612 ci.max_reasm_len = IPV6_MAXPLEN;
24912420
DM		 4613 ci.tstamp = cstamp_delta(idev->tstamp);
4614 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time);
1f9248e5 4615 ci.retrans_time = jiffies_to_msecs(NEIGH_VAR(idev->nd_parms, RETRANS_TIME));
c78679e8
DM		 4616 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci))
4617 goto nla_put_failure;
b382b191
TG		 4618 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
4619 if (nla == NULL)
4620 goto nla_put_failure;
4621 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
4622
4623 /* XXX - MC not implemented */
4624
4625 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
4626 if (nla == NULL)
4627 goto nla_put_failure;
4628 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
4629
4630 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
4631 if (nla == NULL)
4632 goto nla_put_failure;
4633 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
4634
f53adae4
DB		 4635 nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr));
4636 if (nla == NULL)
4637 goto nla_put_failure;
bc91b0f0
JP		 4638
4639 if (nla_put_u8(skb, IFLA_INET6_ADDR_GEN_MODE, idev->addr_gen_mode))
4640 goto nla_put_failure;
4641
f53adae4
DB		 4642 read_lock_bh(&idev->lock);
4643 memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla));
4644 read_unlock_bh(&idev->lock);
4645
b382b191
TG		 4646 return 0;
4647
4648nla_put_failure:
4649 return -EMSGSIZE;
4650}
4651
4652static size_t inet6_get_link_af_size(const struct net_device *dev)
4653{
4654 if (!__in6_dev_get(dev))
4655 return 0;
4656
4657 return inet6_ifla6_size();
4658}
4659
4660static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev)
4661{
4662 struct inet6_dev *idev = __in6_dev_get(dev);
4663
4664 if (!idev)
4665 return -ENODATA;
4666
4667 if (inet6_fill_ifla6_attrs(skb, idev) < 0)
4668 return -EMSGSIZE;
4669
4670 return 0;
4671}
4672
f53adae4
DB		 4673static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token)
4674{
f53adae4
DB		 4675 struct inet6_ifaddr *ifp;
4676 struct net_device *dev = idev->dev;
fc403832 4677 bool update_rs = false;
dc848292 4678 struct in6_addr ll_addr;
f53adae4 4679
c15b1cca
HFS		 4680 ASSERT_RTNL();
4681
f53adae4
DB		 4682 if (token == NULL)
4683 return -EINVAL;
4684 if (ipv6_addr_any(token))
4685 return -EINVAL;
4686 if (dev->flags & (IFF_LOOPBACK | IFF_NOARP))
4687 return -EINVAL;
f53adae4
DB		 4688 if (!ipv6_accept_ra(idev))
4689 return -EINVAL;
4690 if (idev->cnf.rtr_solicits <= 0)
4691 return -EINVAL;
4692
4693 write_lock_bh(&idev->lock);
4694
4695 BUILD_BUG_ON(sizeof(token->s6_addr) != 16);
4696 memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8);
4697
4698 write_unlock_bh(&idev->lock);
4699
dc848292
HFS		 4700 if (!idev->dead && (idev->if_flags & IF_READY) &&
4701 !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE |
4702 IFA_F_OPTIMISTIC)) {
fc403832
DB		 4703
4704 /* If we're not ready, then normal ifup will take care
4705 * of this. Otherwise, we need to request our rs here.
4706 */
4707 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters);
4708 update_rs = true;
4709 }
f53adae4
DB		 4710
4711 write_lock_bh(&idev->lock);
fc403832 4712
77ecaace 4713 if (update_rs) {
fc403832 4714 idev->if_flags |= IF_RS_SENT;
77ecaace
HFS		 4715 idev->rs_probes = 1;
4716 addrconf_mod_rs_timer(idev, idev->cnf.rtr_solicit_interval);
4717 }
f53adae4
DB		 4718
4719 /* Well, that's kinda nasty ... */
4720 list_for_each_entry(ifp, &idev->addr_list, if_list) {
4721 spin_lock(&ifp->lock);
617fe29d 4722 if (ifp->tokenized) {
f53adae4
DB		 4723 ifp->valid_lft = 0;
4724 ifp->prefered_lft = 0;
4725 }
4726 spin_unlock(&ifp->lock);
4727 }
4728
4729 write_unlock_bh(&idev->lock);
b2ed64a9 4730 inet6_ifinfo_notify(RTM_NEWLINK, idev);
c15b1cca 4731 addrconf_verify_rtnl();
f53adae4
DB		 4732 return 0;
4733}
4734
11b1f828
DB		 4735static const struct nla_policy inet6_af_policy[IFLA_INET6_MAX + 1] = {
4736 [IFLA_INET6_ADDR_GEN_MODE] = { .type = NLA_U8 },
4737 [IFLA_INET6_TOKEN] = { .len = sizeof(struct in6_addr) },
4738};
4739
4740static int inet6_validate_link_af(const struct net_device *dev,
4741 const struct nlattr *nla)
4742{
4743 struct nlattr *tb[IFLA_INET6_MAX + 1];
4744
4745 if (dev && !__in6_dev_get(dev))
4746 return -EAFNOSUPPORT;
4747
4748 return nla_parse_nested(tb, IFLA_INET6_MAX, nla, inet6_af_policy);
4749}
4750
f53adae4
DB		 4751static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla)
4752{
4753 int err = -EINVAL;
4754 struct inet6_dev *idev = __in6_dev_get(dev);
4755 struct nlattr *tb[IFLA_INET6_MAX + 1];
4756
4757 if (!idev)
4758 return -EAFNOSUPPORT;
4759
4760 if (nla_parse_nested(tb, IFLA_INET6_MAX, nla, NULL) < 0)
4761 BUG();
4762
bc91b0f0 4763 if (tb[IFLA_INET6_TOKEN]) {
f53adae4 4764 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN]));
bc91b0f0
JP		 4765 if (err)
4766 return err;
4767 }
4768
4769 if (tb[IFLA_INET6_ADDR_GEN_MODE]) {
4770 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]);
4771
4772 if (mode != IN6_ADDR_GEN_MODE_EUI64 &&
622c81d5
HFS		 4773 mode != IN6_ADDR_GEN_MODE_NONE &&
4774 mode != IN6_ADDR_GEN_MODE_STABLE_PRIVACY)
4775 return -EINVAL;
4776
4777 if (mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
4778 !idev->cnf.stable_secret.initialized &&
4779 !dev_net(dev)->ipv6.devconf_dflt->stable_secret.initialized)
bc91b0f0 4780 return -EINVAL;
622c81d5 4781
bc91b0f0
JP		 4782 idev->addr_gen_mode = mode;
4783 err = 0;
4784 }
f53adae4
DB		 4785
4786 return err;
4787}
4788
1ab1457c 4789static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
15e47304 4790 u32 portid, u32 seq, int event, unsigned int flags)
1da177e4 4791{
04561c1f 4792 struct net_device *dev = idev->dev;
04561c1f
TG		 4793 struct ifinfomsg *hdr;
4794 struct nlmsghdr *nlh;
4795 void *protoinfo;
04561c1f 4796
15e47304 4797 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags);
04561c1f 4798 if (nlh == NULL)
26932566 4799 return -EMSGSIZE;
04561c1f
TG		 4800
4801 hdr = nlmsg_data(nlh);
4802 hdr->ifi_family = AF_INET6;
4803 hdr->__ifi_pad = 0;
4804 hdr->ifi_type = dev->type;
4805 hdr->ifi_index = dev->ifindex;
4806 hdr->ifi_flags = dev_get_flags(dev);
4807 hdr->ifi_change = 0;
4808
c78679e8
DM		 4809 if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
4810 (dev->addr_len &&
4811 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
4812 nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
4813 (dev->ifindex != dev->iflink &&
4814 nla_put_u32(skb, IFLA_LINK, dev->iflink)))
4815 goto nla_put_failure;
04561c1f
TG		 4816 protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
4817 if (protoinfo == NULL)
4818 goto nla_put_failure;
1da177e4 4819
b382b191 4820 if (inet6_fill_ifla6_attrs(skb, idev) < 0)
bf99f1bd 4821 goto nla_put_failure;
1da177e4 4822
04561c1f 4823 nla_nest_end(skb, protoinfo);
053c095a
JB		 4824 nlmsg_end(skb, nlh);
4825 return 0;
1da177e4 4826
04561c1f 4827nla_put_failure:
26932566
PM		 4828 nlmsg_cancel(skb, nlh);
4829 return -EMSGSIZE;
1da177e4
LT		 4830}
4831
4832static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
4833{
3b1e0a65 4834 struct net *net = sock_net(skb->sk);
84d2697d 4835 int h, s_h;
434a8a58 4836 int idx = 0, s_idx;
1da177e4
LT		 4837 struct net_device *dev;
4838 struct inet6_dev *idev;
84d2697d 4839 struct hlist_head *head;
1da177e4 4840
84d2697d
ED		 4841 s_h = cb->args[0];
4842 s_idx = cb->args[1];
4843
4844 rcu_read_lock();
4845 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4846 idx = 0;
4847 head = &net->dev_index_head[h];
b67bfe0d 4848 hlist_for_each_entry_rcu(dev, head, index_hlist) {
84d2697d
ED		 4849 if (idx < s_idx)
4850 goto cont;
4851 idev = __in6_dev_get(dev);
4852 if (!idev)
4853 goto cont;
4854 if (inet6_fill_ifinfo(skb, idev,
15e47304 4855 NETLINK_CB(cb->skb).portid,
84d2697d 4856 cb->nlh->nlmsg_seq,
053c095a 4857 RTM_NEWLINK, NLM_F_MULTI) < 0)
84d2697d 4858 goto out;
7562f876 4859cont:
84d2697d
ED		 4860 idx++;
4861 }
1da177e4 4862 }
84d2697d
ED		 4863out:
4864 rcu_read_unlock();
4865 cb->args[1] = idx;
4866 cb->args[0] = h;
1da177e4
LT		 4867
4868 return skb->len;
4869}
4870
4871void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
4872{
4873 struct sk_buff *skb;
c346dca1 4874 struct net *net = dev_net(idev->dev);
8d7a76c9 4875 int err = -ENOBUFS;
1ab1457c 4876
339bf98f 4877 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
8d7a76c9
TG		 4878 if (skb == NULL)
4879 goto errout;
4880
4881 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
26932566
PM		 4882 if (err < 0) {
4883 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
4884 WARN_ON(err == -EMSGSIZE);
4885 kfree_skb(skb);
4886 goto errout;
4887 }
5f75a104 4888 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC);
1ce85fe4 4889 return;
8d7a76c9
TG		 4890errout:
4891 if (err < 0)
5f75a104 4892 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err);
1da177e4
LT		 4893}
4894
339bf98f
TG		 4895static inline size_t inet6_prefix_nlmsg_size(void)
4896{
4897 return NLMSG_ALIGN(sizeof(struct prefixmsg))
4898 + nla_total_size(sizeof(struct in6_addr))
4899 + nla_total_size(sizeof(struct prefix_cacheinfo));
4900}
c5396a31 4901
1da177e4 4902static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
15e47304 4903 struct prefix_info *pinfo, u32 portid, u32 seq,
6051e2f4 4904 int event, unsigned int flags)
1da177e4 4905{
6051e2f4
TG		 4906 struct prefixmsg *pmsg;
4907 struct nlmsghdr *nlh;
1da177e4
LT		 4908 struct prefix_cacheinfo ci;
4909
15e47304 4910 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags);
6051e2f4 4911 if (nlh == NULL)
26932566 4912 return -EMSGSIZE;
6051e2f4
TG		 4913
4914 pmsg = nlmsg_data(nlh);
1da177e4 4915 pmsg->prefix_family = AF_INET6;
8a47077a
PM		 4916 pmsg->prefix_pad1 = 0;
4917 pmsg->prefix_pad2 = 0;
1da177e4
LT		 4918 pmsg->prefix_ifindex = idev->dev->ifindex;
4919 pmsg->prefix_len = pinfo->prefix_len;
4920 pmsg->prefix_type = pinfo->type;
8a47077a 4921 pmsg->prefix_pad3 = 0;
1da177e4
LT		 4922 pmsg->prefix_flags = 0;
4923 if (pinfo->onlink)
4924 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
4925 if (pinfo->autoconf)
4926 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
4927
c78679e8
DM		 4928 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix))
4929 goto nla_put_failure;
1da177e4
LT		 4930 ci.preferred_time = ntohl(pinfo->prefered);
4931 ci.valid_time = ntohl(pinfo->valid);
c78679e8
DM		 4932 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci))
4933 goto nla_put_failure;
053c095a
JB		 4934 nlmsg_end(skb, nlh);
4935 return 0;
1da177e4 4936
6051e2f4 4937nla_put_failure:
26932566
PM		 4938 nlmsg_cancel(skb, nlh);
4939 return -EMSGSIZE;
1da177e4
LT		 4940}
4941
1ab1457c 4942static void inet6_prefix_notify(int event, struct inet6_dev *idev,
1da177e4
LT		 4943 struct prefix_info *pinfo)
4944{
4945 struct sk_buff *skb;
c346dca1 4946 struct net *net = dev_net(idev->dev);
8c384bfa 4947 int err = -ENOBUFS;
1da177e4 4948
339bf98f 4949 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
8c384bfa
TG		 4950 if (skb == NULL)
4951 goto errout;
4952
4953 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
26932566
PM		 4954 if (err < 0) {
4955 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
4956 WARN_ON(err == -EMSGSIZE);
4957 kfree_skb(skb);
4958 goto errout;
4959 }
1ce85fe4
PNA		 4960 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
4961 return;
8c384bfa
TG		 4962errout:
4963 if (err < 0)
6fda7350 4964 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
1da177e4
LT		 4965}
4966
1da177e4
LT		 4967static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4968{
63998ac2
ND		 4969 struct net *net = dev_net(ifp->idev->dev);
4970
c15b1cca
HFS		 4971 if (event)
4972 ASSERT_RTNL();
4973
1da177e4
LT		 4974 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
4975
4976 switch (event) {
4977 case RTM_NEWADDR:
95c385b4
NH		 4978 /*
4979 * If the address was optimistic
4980 * we inserted the route at the start of
4981 * our DAD process, so we don't need
4982 * to do it again
4983 */
4984 if (!(ifp->rt->rt6i_node))
4985 ip6_ins_rt(ifp->rt);
1da177e4
LT		 4986 if (ifp->idev->cnf.forwarding)
4987 addrconf_join_anycast(ifp);
7996c799 4988 if (!ipv6_addr_any(&ifp->peer_addr))
caeaba79
ND		 4989 addrconf_prefix_route(&ifp->peer_addr, 128,
4990 ifp->idev->dev, 0, 0);
1da177e4
LT		 4991 break;
4992 case RTM_DELADDR:
4993 if (ifp->idev->cnf.forwarding)
4994 addrconf_leave_anycast(ifp);
4995 addrconf_leave_solict(ifp->idev, &ifp->addr);
7996c799 4996 if (!ipv6_addr_any(&ifp->peer_addr)) {
caeaba79 4997 struct rt6_info *rt;
caeaba79 4998
e7478dfc
ND		 4999 rt = addrconf_get_prefix_route(&ifp->peer_addr, 128,
5000 ifp->idev->dev, 0, 0);
f24062b0
ND		 5001 if (rt && ip6_del_rt(rt))
5002 dst_free(&rt->dst);
caeaba79 5003 }
d8d1f30b 5004 dst_hold(&ifp->rt->dst);
93fa159a 5005
73a8bd74 5006 if (ip6_del_rt(ifp->rt))
d8d1f30b 5007 dst_free(&ifp->rt->dst);
705f1c86
HFS		 5008
5009 rt_genid_bump_ipv6(net);
1da177e4
LT		 5010 break;
5011 }
63998ac2 5012 atomic_inc(&net->ipv6.dev_addr_genid);
1da177e4
LT		 5013}
5014
5015static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
5016{
8814c4b5 5017 rcu_read_lock_bh();
1da177e4
LT		 5018 if (likely(ifp->idev->dead == 0))
5019 __ipv6_ifa_notify(event, ifp);
8814c4b5 5020 rcu_read_unlock_bh();
1da177e4
LT		 5021}
5022
5023#ifdef CONFIG_SYSCTL
5024
5025static
fe2c6338 5026int addrconf_sysctl_forward(struct ctl_table *ctl, int write,
1da177e4
LT		 5027 void __user *buffer, size_t *lenp, loff_t *ppos)
5028{
5029 int *valp = ctl->data;
5030 int val = *valp;
88af182e 5031 loff_t pos = *ppos;
fe2c6338 5032 struct ctl_table lctl;
1da177e4
LT		 5033 int ret;
5034
013d97e9
FR		 5035 /*
5036 * ctl->data points to idev->cnf.forwarding, we should
5037 * not modify it until we get the rtnl lock.
5038 */
5039 lctl = *ctl;
5040 lctl.data = &val;
5041
5042 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
1da177e4 5043
c8fecf22 5044 if (write)
b325fddb 5045 ret = addrconf_fixup_forwarding(ctl, valp, val);
88af182e
EB		 5046 if (ret)
5047 *ppos = pos;
1ab1457c 5048 return ret;
1da177e4
LT		 5049}
5050
77751427
ML		 5051static
5052int addrconf_sysctl_mtu(struct ctl_table *ctl, int write,
5053 void __user *buffer, size_t *lenp, loff_t *ppos)
5054{
5055 struct inet6_dev *idev = ctl->extra1;
5056 int min_mtu = IPV6_MIN_MTU;
5057 struct ctl_table lctl;
5058
5059 lctl = *ctl;
5060 lctl.extra1 = &min_mtu;
5061 lctl.extra2 = idev ? &idev->dev->mtu : NULL;
5062
5063 return proc_dointvec_minmax(&lctl, write, buffer, lenp, ppos);
5064}
5065
56d417b1
BH		 5066static void dev_disable_change(struct inet6_dev *idev)
5067{
75538c2b
CW		 5068 struct netdev_notifier_info info;
5069
56d417b1
BH		 5070 if (!idev || !idev->dev)
5071 return;
5072
75538c2b 5073 netdev_notifier_info_init(&info, idev->dev);
56d417b1 5074 if (idev->cnf.disable_ipv6)
75538c2b 5075 addrconf_notify(NULL, NETDEV_DOWN, &info);
56d417b1 5076 else
75538c2b 5077 addrconf_notify(NULL, NETDEV_UP, &info);
56d417b1
BH		 5078}
5079
5080static void addrconf_disable_change(struct net *net, __s32 newf)
5081{
5082 struct net_device *dev;
5083 struct inet6_dev *idev;
5084
c6d14c84
ED		 5085 rcu_read_lock();
5086 for_each_netdev_rcu(net, dev) {
56d417b1
BH		 5087 idev = __in6_dev_get(dev);
5088 if (idev) {
5089 int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
5090 idev->cnf.disable_ipv6 = newf;
5091 if (changed)
5092 dev_disable_change(idev);
5093 }
56d417b1 5094 }
c6d14c84 5095 rcu_read_unlock();
56d417b1
BH		 5096}
5097
013d97e9 5098static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf)
56d417b1
BH		 5099{
5100 struct net *net;
013d97e9
FR		 5101 int old;
5102
5103 if (!rtnl_trylock())
5104 return restart_syscall();
56d417b1
BH		 5105
5106 net = (struct net *)table->extra2;
013d97e9
FR		 5107 old = *p;
5108 *p = newf;
56d417b1 5109
013d97e9
FR		 5110 if (p == &net->ipv6.devconf_dflt->disable_ipv6) {
5111 rtnl_unlock();
56d417b1 5112 return 0;
88af182e 5113 }
56d417b1
BH		 5114
5115 if (p == &net->ipv6.devconf_all->disable_ipv6) {
56d417b1
BH		 5116 net->ipv6.devconf_dflt->disable_ipv6 = newf;
5117 addrconf_disable_change(net, newf);
013d97e9 5118 } else if ((!newf) ^ (!old))
56d417b1
BH		 5119 dev_disable_change((struct inet6_dev *)table->extra1);
5120
5121 rtnl_unlock();
5122 return 0;
5123}
5124
5125static
fe2c6338 5126int addrconf_sysctl_disable(struct ctl_table *ctl, int write,
56d417b1
BH		 5127 void __user *buffer, size_t *lenp, loff_t *ppos)
5128{
5129 int *valp = ctl->data;
5130 int val = *valp;
88af182e 5131 loff_t pos = *ppos;
fe2c6338 5132 struct ctl_table lctl;
56d417b1
BH		 5133 int ret;
5134
013d97e9
FR		 5135 /*
5136 * ctl->data points to idev->cnf.disable_ipv6, we should
5137 * not modify it until we get the rtnl lock.
5138 */
5139 lctl = *ctl;
5140 lctl.data = &val;
5141
5142 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
56d417b1
BH		 5143
5144 if (write)
5145 ret = addrconf_disable_ipv6(ctl, valp, val);
88af182e
EB		 5146 if (ret)
5147 *ppos = pos;
56d417b1
BH		 5148 return ret;
5149}
5150
c92d5491 5151static
5152int addrconf_sysctl_proxy_ndp(struct ctl_table *ctl, int write,
5153 void __user *buffer, size_t *lenp, loff_t *ppos)
5154{
5155 int *valp = ctl->data;
5156 int ret;
5157 int old, new;
5158
5159 old = *valp;
5160 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
5161 new = *valp;
5162
5163 if (write && old != new) {
5164 struct net *net = ctl->extra2;
5165
5166 if (!rtnl_trylock())
5167 return restart_syscall();
5168
5169 if (valp == &net->ipv6.devconf_dflt->proxy_ndp)
5170 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
5171 NETCONFA_IFINDEX_DEFAULT,
5172 net->ipv6.devconf_dflt);
5173 else if (valp == &net->ipv6.devconf_all->proxy_ndp)
5174 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
5175 NETCONFA_IFINDEX_ALL,
5176 net->ipv6.devconf_all);
5177 else {
5178 struct inet6_dev *idev = ctl->extra1;
5179
5180 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
5181 idev->dev->ifindex,
5182 &idev->cnf);
5183 }
5184 rtnl_unlock();
5185 }
5186
5187 return ret;
5188}
5189
3d1bec99
HFS		 5190static int addrconf_sysctl_stable_secret(struct ctl_table *ctl, int write,
5191 void __user *buffer, size_t *lenp,
5192 loff_t *ppos)
5193{
5194 int err;
5195 struct in6_addr addr;
5196 char str[IPV6_MAX_STRLEN];
5197 struct ctl_table lctl = *ctl;
622c81d5 5198 struct net *net = ctl->extra2;
3d1bec99
HFS		 5199 struct ipv6_stable_secret *secret = ctl->data;
5200
622c81d5
HFS		 5201 if (&net->ipv6.devconf_all->stable_secret == ctl->data)
5202 return -EIO;
5203
3d1bec99
HFS		 5204 lctl.maxlen = IPV6_MAX_STRLEN;
5205 lctl.data = str;
5206
5207 if (!rtnl_trylock())
5208 return restart_syscall();
5209
5210 if (!write && !secret->initialized) {
5211 err = -EIO;
5212 goto out;
5213 }
5214
5215 if (!write) {
5216 err = snprintf(str, sizeof(str), "%pI6",
5217 &secret->secret);
5218 if (err >= sizeof(str)) {
5219 err = -EIO;
5220 goto out;
5221 }
5222 }
5223
5224 err = proc_dostring(&lctl, write, buffer, lenp, ppos);
5225 if (err || !write)
5226 goto out;
5227
5228 if (in6_pton(str, -1, addr.in6_u.u6_addr8, -1, NULL) != 1) {
5229 err = -EIO;
5230 goto out;
5231 }
5232
5233 secret->initialized = true;
5234 secret->secret = addr;
5235
622c81d5
HFS		 5236 if (&net->ipv6.devconf_dflt->stable_secret == ctl->data) {
5237 struct net_device *dev;
5238
5239 for_each_netdev(net, dev) {
5240 struct inet6_dev *idev = __in6_dev_get(dev);
5241
5242 if (idev) {
5243 idev->addr_gen_mode =
5244 IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
5245 }
5246 }
5247 } else {
5248 struct inet6_dev *idev = ctl->extra1;
5249
5250 idev->addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
5251 }
5252
3d1bec99
HFS		 5253out:
5254 rtnl_unlock();
5255
5256 return err;
5257}
c92d5491 5258
1da177e4
LT		 5259static struct addrconf_sysctl_table
5260{
5261 struct ctl_table_header *sysctl_header;
fe2c6338 5262 struct ctl_table addrconf_vars[DEVCONF_MAX+1];
ab32ea5d 5263} addrconf_sysctl __read_mostly = {
1da177e4
LT		 5264 .sysctl_header = NULL,
5265 .addrconf_vars = {
1ab1457c 5266 {
e21e8467
SH		 5267 .procname = "forwarding",
5268 .data = &ipv6_devconf.forwarding,
5269 .maxlen = sizeof(int),
5270 .mode = 0644,
5271 .proc_handler = addrconf_sysctl_forward,
1da177e4
LT		 5272 },
5273 {
e21e8467
SH		 5274 .procname = "hop_limit",
5275 .data = &ipv6_devconf.hop_limit,
5276 .maxlen = sizeof(int),
5277 .mode = 0644,
5278 .proc_handler = proc_dointvec,
1da177e4
LT		 5279 },
5280 {
e21e8467
SH		 5281 .procname = "mtu",
5282 .data = &ipv6_devconf.mtu6,
5283 .maxlen = sizeof(int),
5284 .mode = 0644,
77751427 5285 .proc_handler = addrconf_sysctl_mtu,
1da177e4
LT		 5286 },
5287 {
e21e8467
SH		 5288 .procname = "accept_ra",
5289 .data = &ipv6_devconf.accept_ra,
5290 .maxlen = sizeof(int),
5291 .mode = 0644,
5292 .proc_handler = proc_dointvec,
1da177e4
LT		 5293 },
5294 {
e21e8467
SH		 5295 .procname = "accept_redirects",
5296 .data = &ipv6_devconf.accept_redirects,
5297 .maxlen = sizeof(int),
5298 .mode = 0644,
5299 .proc_handler = proc_dointvec,
1da177e4
LT		 5300 },
5301 {
e21e8467
SH		 5302 .procname = "autoconf",
5303 .data = &ipv6_devconf.autoconf,
5304 .maxlen = sizeof(int),
5305 .mode = 0644,
5306 .proc_handler = proc_dointvec,
1da177e4
LT		 5307 },
5308 {
e21e8467
SH		 5309 .procname = "dad_transmits",
5310 .data = &ipv6_devconf.dad_transmits,
5311 .maxlen = sizeof(int),
5312 .mode = 0644,
5313 .proc_handler = proc_dointvec,
1da177e4
LT		 5314 },
5315 {
e21e8467
SH		 5316 .procname = "router_solicitations",
5317 .data = &ipv6_devconf.rtr_solicits,
5318 .maxlen = sizeof(int),
5319 .mode = 0644,
5320 .proc_handler = proc_dointvec,
1da177e4
LT		 5321 },
5322 {
e21e8467
SH		 5323 .procname = "router_solicitation_interval",
5324 .data = &ipv6_devconf.rtr_solicit_interval,
5325 .maxlen = sizeof(int),
5326 .mode = 0644,
5327 .proc_handler = proc_dointvec_jiffies,
1da177e4
LT		 5328 },
5329 {
e21e8467
SH		 5330 .procname = "router_solicitation_delay",
5331 .data = &ipv6_devconf.rtr_solicit_delay,
5332 .maxlen = sizeof(int),
5333 .mode = 0644,
5334 .proc_handler = proc_dointvec_jiffies,
1da177e4
LT		 5335 },
5336 {
e21e8467
SH		 5337 .procname = "force_mld_version",
5338 .data = &ipv6_devconf.force_mld_version,
5339 .maxlen = sizeof(int),
5340 .mode = 0644,
5341 .proc_handler = proc_dointvec,
1da177e4 5342 },
fc4eba58
HFS		 5343 {
5344 .procname = "mldv1_unsolicited_report_interval",
5345 .data =
5346 &ipv6_devconf.mldv1_unsolicited_report_interval,
5347 .maxlen = sizeof(int),
5348 .mode = 0644,
5349 .proc_handler = proc_dointvec_ms_jiffies,
5350 },
5351 {
5352 .procname = "mldv2_unsolicited_report_interval",
5353 .data =
5354 &ipv6_devconf.mldv2_unsolicited_report_interval,
5355 .maxlen = sizeof(int),
5356 .mode = 0644,
5357 .proc_handler = proc_dointvec_ms_jiffies,
5358 },
1da177e4 5359 {
e21e8467
SH		 5360 .procname = "use_tempaddr",
5361 .data = &ipv6_devconf.use_tempaddr,
5362 .maxlen = sizeof(int),
5363 .mode = 0644,
5364 .proc_handler = proc_dointvec,
1da177e4
LT		 5365 },
5366 {
e21e8467
SH		 5367 .procname = "temp_valid_lft",
5368 .data = &ipv6_devconf.temp_valid_lft,
5369 .maxlen = sizeof(int),
5370 .mode = 0644,
5371 .proc_handler = proc_dointvec,
1da177e4
LT		 5372 },
5373 {
e21e8467
SH		 5374 .procname = "temp_prefered_lft",
5375 .data = &ipv6_devconf.temp_prefered_lft,
5376 .maxlen = sizeof(int),
5377 .mode = 0644,
5378 .proc_handler = proc_dointvec,
1da177e4
LT		 5379 },
5380 {
e21e8467
SH		 5381 .procname = "regen_max_retry",
5382 .data = &ipv6_devconf.regen_max_retry,
5383 .maxlen = sizeof(int),
5384 .mode = 0644,
5385 .proc_handler = proc_dointvec,
1da177e4
LT		 5386 },
5387 {
e21e8467
SH		 5388 .procname = "max_desync_factor",
5389 .data = &ipv6_devconf.max_desync_factor,
5390 .maxlen = sizeof(int),
5391 .mode = 0644,
5392 .proc_handler = proc_dointvec,
1da177e4 5393 },
1da177e4 5394 {
e21e8467
SH		 5395 .procname = "max_addresses",
5396 .data = &ipv6_devconf.max_addresses,
5397 .maxlen = sizeof(int),
5398 .mode = 0644,
5399 .proc_handler = proc_dointvec,
1da177e4 5400 },
65f5c7c1 5401 {
e21e8467
SH		 5402 .procname = "accept_ra_defrtr",
5403 .data = &ipv6_devconf.accept_ra_defrtr,
5404 .maxlen = sizeof(int),
5405 .mode = 0644,
5406 .proc_handler = proc_dointvec,
65f5c7c1 5407 },
c4fd30eb 5408 {
e21e8467
SH		 5409 .procname = "accept_ra_pinfo",
5410 .data = &ipv6_devconf.accept_ra_pinfo,
5411 .maxlen = sizeof(int),
5412 .mode = 0644,
5413 .proc_handler = proc_dointvec,
c4fd30eb 5414 },
930d6ff2
YH		 5415#ifdef CONFIG_IPV6_ROUTER_PREF
5416 {
e21e8467
SH		 5417 .procname = "accept_ra_rtr_pref",
5418 .data = &ipv6_devconf.accept_ra_rtr_pref,
5419 .maxlen = sizeof(int),
5420 .mode = 0644,
5421 .proc_handler = proc_dointvec,
930d6ff2 5422 },
52e16356 5423 {
e21e8467
SH		 5424 .procname = "router_probe_interval",
5425 .data = &ipv6_devconf.rtr_probe_interval,
5426 .maxlen = sizeof(int),
5427 .mode = 0644,
5428 .proc_handler = proc_dointvec_jiffies,
52e16356 5429 },
fa03ef38 5430#ifdef CONFIG_IPV6_ROUTE_INFO
09c884d4 5431 {
e21e8467
SH		 5432 .procname = "accept_ra_rt_info_max_plen",
5433 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
5434 .maxlen = sizeof(int),
5435 .mode = 0644,
5436 .proc_handler = proc_dointvec,
09c884d4
YH		 5437 },
5438#endif
930d6ff2 5439#endif
fbea49e1 5440 {
e21e8467
SH		 5441 .procname = "proxy_ndp",
5442 .data = &ipv6_devconf.proxy_ndp,
5443 .maxlen = sizeof(int),
5444 .mode = 0644,
c92d5491 5445 .proc_handler = addrconf_sysctl_proxy_ndp,
fbea49e1 5446 },
0bcbc926 5447 {
e21e8467
SH		 5448 .procname = "accept_source_route",
5449 .data = &ipv6_devconf.accept_source_route,
5450 .maxlen = sizeof(int),
5451 .mode = 0644,
5452 .proc_handler = proc_dointvec,
0bcbc926 5453 },
95c385b4
NH		 5454#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
5455 {
e21e8467
SH		 5456 .procname = "optimistic_dad",
5457 .data = &ipv6_devconf.optimistic_dad,
5458 .maxlen = sizeof(int),
5459 .mode = 0644,
5460 .proc_handler = proc_dointvec,
95c385b4
NH		 5461
5462 },
7fd2561e
EK		 5463 {
5464 .procname = "use_optimistic",
5465 .data = &ipv6_devconf.use_optimistic,
5466 .maxlen = sizeof(int),
5467 .mode = 0644,
5468 .proc_handler = proc_dointvec,
5469
5470 },
7bc570c8
YH		 5471#endif
5472#ifdef CONFIG_IPV6_MROUTE
5473 {
e21e8467
SH		 5474 .procname = "mc_forwarding",
5475 .data = &ipv6_devconf.mc_forwarding,
5476 .maxlen = sizeof(int),
5477 .mode = 0444,
5478 .proc_handler = proc_dointvec,
7bc570c8 5479 },
95c385b4 5480#endif
778d80be 5481 {
e21e8467
SH		 5482 .procname = "disable_ipv6",
5483 .data = &ipv6_devconf.disable_ipv6,
5484 .maxlen = sizeof(int),
5485 .mode = 0644,
5486 .proc_handler = addrconf_sysctl_disable,
778d80be 5487 },
1b34be74 5488 {
e21e8467
SH		 5489 .procname = "accept_dad",
5490 .data = &ipv6_devconf.accept_dad,
5491 .maxlen = sizeof(int),
5492 .mode = 0644,
5493 .proc_handler = proc_dointvec,
1b34be74 5494 },
f7734fdf 5495 {
f7734fdf
OP		 5496 .procname = "force_tllao",
5497 .data = &ipv6_devconf.force_tllao,
5498 .maxlen = sizeof(int),
5499 .mode = 0644,
5500 .proc_handler = proc_dointvec
5501 },
5cb04436
HFS		 5502 {
5503 .procname = "ndisc_notify",
5504 .data = &ipv6_devconf.ndisc_notify,
5505 .maxlen = sizeof(int),
5506 .mode = 0644,
5507 .proc_handler = proc_dointvec
5508 },
b800c3b9
HFS		 5509 {
5510 .procname = "suppress_frag_ndisc",
5511 .data = &ipv6_devconf.suppress_frag_ndisc,
5512 .maxlen = sizeof(int),
5513 .mode = 0644,
5514 .proc_handler = proc_dointvec
5515 },
d9333196
BG		 5516 {
5517 .procname = "accept_ra_from_local",
5518 .data = &ipv6_devconf.accept_ra_from_local,
5519 .maxlen = sizeof(int),
5520 .mode = 0644,
5521 .proc_handler = proc_dointvec,
5522 },
c2943f14
HH		 5523 {
5524 .procname = "accept_ra_mtu",
5525 .data = &ipv6_devconf.accept_ra_mtu,
5526 .maxlen = sizeof(int),
5527 .mode = 0644,
5528 .proc_handler = proc_dointvec,
5529 },
3d1bec99
HFS		 5530 {
5531 .procname = "stable_secret",
5532 .data = &ipv6_devconf.stable_secret,
5533 .maxlen = IPV6_MAX_STRLEN,
5534 .mode = 0600,
5535 .proc_handler = addrconf_sysctl_stable_secret,
5536 },
1da177e4 5537 {
f8572d8f 5538 /* sentinel */
1da177e4
LT		 5539 }
5540 },
1da177e4
LT		 5541};
5542
bff16c2f 5543static int __addrconf_sysctl_register(struct net *net, char *dev_name,
f8572d8f 5544 struct inet6_dev *idev, struct ipv6_devconf *p)
1da177e4
LT		 5545{
5546 int i;
1da177e4 5547 struct addrconf_sysctl_table *t;
6105e293 5548 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ];
1dab6222 5549
af879cc7 5550 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
1da177e4 5551 if (t == NULL)
f68635e6
PE		 5552 goto out;
5553
bcdd553f 5554 for (i = 0; t->addrconf_vars[i].data; i++) {
e21e8467 5555 t->addrconf_vars[i].data += (char *)p - (char *)&ipv6_devconf;
1da177e4 5556 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
bff16c2f 5557 t->addrconf_vars[i].extra2 = net;
1da177e4 5558 }
1da177e4 5559
6105e293 5560 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name);
1da177e4 5561
6105e293 5562 t->sysctl_header = register_net_sysctl(net, path, t->addrconf_vars);
1da177e4 5563 if (t->sysctl_header == NULL)
6105e293 5564 goto free;
f68635e6
PE		 5565
5566 p->sysctl = t;
95897312 5567 return 0;
1da177e4 5568
f68635e6 5569free:
1da177e4 5570 kfree(t);
f68635e6 5571out:
95897312 5572 return -ENOBUFS;
1da177e4
LT		 5573}
5574
408c4768
PE		 5575static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
5576{
5577 struct addrconf_sysctl_table *t;
5578
5579 if (p->sysctl == NULL)
5580 return;
5581
5582 t = p->sysctl;
5583 p->sysctl = NULL;
ff538818 5584 unregister_net_sysctl_table(t->sysctl_header);
408c4768
PE		 5585 kfree(t);
5586}
5587
a317a2f1 5588static int addrconf_sysctl_register(struct inet6_dev *idev)
f52295a9 5589{
a317a2f1
WC		 5590 int err;
5591
5592 if (!sysctl_dev_name_is_allowed(idev->dev->name))
5593 return -EINVAL;
5594
5595 err = neigh_sysctl_register(idev->dev, idev->nd_parms,
5596 &ndisc_ifinfo_sysctl_change);
5597 if (err)
5598 return err;
5599 err = __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
5600 idev, &idev->cnf);
5601 if (err)
5602 neigh_sysctl_unregister(idev->nd_parms);
5603
5604 return err;
f52295a9
PE		 5605}
5606
408c4768 5607static void addrconf_sysctl_unregister(struct inet6_dev *idev)
1da177e4 5608{
408c4768
PE		 5609 __addrconf_sysctl_unregister(&idev->cnf);
5610 neigh_sysctl_unregister(idev->nd_parms);
1da177e4
LT		 5611}
5612
5613
5614#endif
5615
2c8c1e72 5616static int __net_init addrconf_init_net(struct net *net)
e0da5a48 5617{
a79ca223 5618 int err = -ENOMEM;
e0da5a48
PE		 5619 struct ipv6_devconf *all, *dflt;
5620
a79ca223
HZ		 5621 all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL);
5622 if (all == NULL)
5623 goto err_alloc_all;
e0da5a48 5624
a79ca223
HZ		 5625 dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
5626 if (dflt == NULL)
5627 goto err_alloc_dflt;
e0da5a48 5628
a79ca223
HZ		 5629 /* these will be inherited by all namespaces */
5630 dflt->autoconf = ipv6_defaults.autoconf;
5631 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
e0da5a48 5632
3d1bec99
HFS		 5633 dflt->stable_secret.initialized = false;
5634 all->stable_secret.initialized = false;
5635
e0da5a48
PE		 5636 net->ipv6.devconf_all = all;
5637 net->ipv6.devconf_dflt = dflt;
5638
5639#ifdef CONFIG_SYSCTL
f8572d8f 5640 err = __addrconf_sysctl_register(net, "all", NULL, all);
e0da5a48
PE		 5641 if (err < 0)
5642 goto err_reg_all;
5643
f8572d8f 5644 err = __addrconf_sysctl_register(net, "default", NULL, dflt);
e0da5a48
PE		 5645 if (err < 0)
5646 goto err_reg_dflt;
5647#endif
5648 return 0;
5649
5650#ifdef CONFIG_SYSCTL
5651err_reg_dflt:
5652 __addrconf_sysctl_unregister(all);
5653err_reg_all:
5654 kfree(dflt);
5655#endif
5656err_alloc_dflt:
5657 kfree(all);
5658err_alloc_all:
5659 return err;
5660}
5661
2c8c1e72 5662static void __net_exit addrconf_exit_net(struct net *net)
e0da5a48
PE		 5663{
5664#ifdef CONFIG_SYSCTL
5665 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
5666 __addrconf_sysctl_unregister(net->ipv6.devconf_all);
5667#endif
73cf0e92 5668 kfree(net->ipv6.devconf_dflt);
5669 kfree(net->ipv6.devconf_all);
e0da5a48
PE		 5670}
5671
5672static struct pernet_operations addrconf_ops = {
5673 .init = addrconf_init_net,
5674 .exit = addrconf_exit_net,
5675};
5676
207895fd 5677static struct rtnl_af_ops inet6_ops __read_mostly = {
b382b191
TG		 5678 .family = AF_INET6,
5679 .fill_link_af = inet6_fill_link_af,
5680 .get_link_af_size = inet6_get_link_af_size,
11b1f828 5681 .validate_link_af = inet6_validate_link_af,
f53adae4 5682 .set_link_af = inet6_set_link_af,
b382b191
TG		 5683};
5684
1da177e4
LT		 5685/*
5686 * Init / cleanup code
5687 */
5688
5689int __init addrconf_init(void)
5690{
a317a2f1 5691 struct inet6_dev *idev;
c2e21293 5692 int i, err;
2a8cc6c8 5693
e21e8467
SH		 5694 err = ipv6_addr_label_init();
5695 if (err < 0) {
f3213831
JP		 5696 pr_crit("%s: cannot initialize default policy table: %d\n",
5697 __func__, err);
2cc6d2bf 5698 goto out;
2a8cc6c8 5699 }
1da177e4 5700
2cc6d2bf
NH		 5701 err = register_pernet_subsys(&addrconf_ops);
5702 if (err < 0)
5703 goto out_addrlabel;
e0da5a48 5704
c15b1cca
HFS		 5705 addrconf_wq = create_workqueue("ipv6_addrconf");
5706 if (!addrconf_wq) {
5707 err = -ENOMEM;
5708 goto out_nowq;
5709 }
5710
1da177e4
LT		 5711 /* The addrconf netdev notifier requires that loopback_dev
5712 * has it's ipv6 private information allocated and setup
5713 * before it can bring up and give link-local addresses
5714 * to other devices which are up.
5715 *
5716 * Unfortunately, loopback_dev is not necessarily the first
5717 * entry in the global dev_base list of net devices. In fact,
5718 * it is likely to be the very last entry on that list.
5719 * So this causes the notifier registry below to try and
5720 * give link-local addresses to all devices besides loopback_dev
5721 * first, then loopback_dev, which cases all the non-loopback_dev
5722 * devices to fail to get a link-local address.
5723 *
5724 * So, as a temporary fix, allocate the ipv6 structure for
5725 * loopback_dev first by hand.
5726 * Longer term, all of the dependencies ipv6 has upon the loopback
5727 * device and it being up should be removed.
5728 */
5729 rtnl_lock();
a317a2f1 5730 idev = ipv6_add_dev(init_net.loopback_dev);
1da177e4 5731 rtnl_unlock();
a317a2f1
WC		 5732 if (IS_ERR(idev)) {
5733 err = PTR_ERR(idev);
e0da5a48 5734 goto errlo;
a317a2f1 5735 }
1da177e4 5736
c2e21293 5737 for (i = 0; i < IN6_ADDR_HSIZE; i++)
5738 INIT_HLIST_HEAD(&inet6_addr_lst[i]);
5739
1da177e4
LT		 5740 register_netdevice_notifier(&ipv6_dev_notf);
5741
c15b1cca 5742 addrconf_verify();
c127ea2c 5743
3678a9d8 5744 rtnl_af_register(&inet6_ops);
b382b191 5745
c7ac8679
GR		 5746 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo,
5747 NULL);
c127ea2c
TG		 5748 if (err < 0)
5749 goto errout;
5750
5751 /* Only the first call to __rtnl_register can fail */
c7ac8679
GR		 5752 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL, NULL);
5753 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL, NULL);
5754 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr,
5755 inet6_dump_ifaddr, NULL);
5756 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL,
5757 inet6_dump_ifmcaddr, NULL);
5758 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL,
5759 inet6_dump_ifacaddr, NULL);
76f8f6cb 5760 __rtnl_register(PF_INET6, RTM_GETNETCONF, inet6_netconf_get_devconf,
7a674200 5761 inet6_netconf_dump_devconf, NULL);
c127ea2c 5762
2a8cc6c8
YH		 5763 ipv6_addr_label_rtnl_register();
5764
1da177e4 5765 return 0;
c127ea2c 5766errout:
b382b191 5767 rtnl_af_unregister(&inet6_ops);
c127ea2c 5768 unregister_netdevice_notifier(&ipv6_dev_notf);
e0da5a48 5769errlo:
c15b1cca
HFS		 5770 destroy_workqueue(addrconf_wq);
5771out_nowq:
e0da5a48 5772 unregister_pernet_subsys(&addrconf_ops);
2cc6d2bf
NH		 5773out_addrlabel:
5774 ipv6_addr_label_cleanup();
5775out:
c127ea2c 5776 return err;
1da177e4
LT		 5777}
5778
09f7709f 5779void addrconf_cleanup(void)
1da177e4 5780{
176c39af 5781 struct net_device *dev;
1da177e4
LT		 5782 int i;
5783
5784 unregister_netdevice_notifier(&ipv6_dev_notf);
e0da5a48 5785 unregister_pernet_subsys(&addrconf_ops);
2cc6d2bf 5786 ipv6_addr_label_cleanup();
1da177e4
LT		 5787
5788 rtnl_lock();
5789
b382b191
TG		 5790 __rtnl_af_unregister(&inet6_ops);
5791
176c39af
DL		 5792 /* clean dev list */
5793 for_each_netdev(&init_net, dev) {
5794 if (__in6_dev_get(dev) == NULL)
5795 continue;
5796 addrconf_ifdown(dev, 1);
5797 }
5798 addrconf_ifdown(init_net.loopback_dev, 2);
5799
1da177e4
LT		 5800 /*
5801 * Check hash table.
5802 */
5c578aed 5803 spin_lock_bh(&addrconf_hash_lock);
c2e21293 5804 for (i = 0; i < IN6_ADDR_HSIZE; i++)
5805 WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
5c578aed 5806 spin_unlock_bh(&addrconf_hash_lock);
c15b1cca 5807 cancel_delayed_work(&addr_chk_work);
1da177e4 5808 rtnl_unlock();
c15b1cca
HFS		 5809
5810 destroy_workqueue(addrconf_wq);
1da177e4 5811}
Linux kernel - Deliverables
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