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ipv6: fix a refcnt leak with peer addr
[mirror_ubuntu-jammy-kernel.git] / net / ipv6 / addrconf.c
CommitLineData
1da177e4
LT		 1/*
2 * IPv6 Address [auto]configuration
3 * Linux INET6 implementation
4 *
5 * Authors:
1ab1457c 6 * Pedro Roque <roque@di.fc.ul.pt>
1da177e4
LT		 7 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
8 *
1da177e4
LT		 9 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License
11 * as published by the Free Software Foundation; either version
12 * 2 of the License, or (at your option) any later version.
13 */
14
15/*
16 * Changes:
17 *
18 * Janos Farkas : delete timer on ifdown
19 * <chexum@bankinf.banki.hu>
20 * Andi Kleen : kill double kfree on module
21 * unload.
22 * Maciej W. Rozycki : FDDI support
23 * sekiya@USAGI : Don't send too many RS
24 * packets.
25 * yoshfuji@USAGI : Fixed interval between DAD
26 * packets.
27 * YOSHIFUJI Hideaki @USAGI : improved accuracy of
28 * address validation timer.
29 * YOSHIFUJI Hideaki @USAGI : Privacy Extensions (RFC3041)
30 * support.
31 * Yuji SEKIYA @USAGI : Don't assign a same IPv6
32 * address on a same interface.
33 * YOSHIFUJI Hideaki @USAGI : ARCnet support
34 * YOSHIFUJI Hideaki @USAGI : convert /proc/net/if_inet6 to
35 * seq_file.
b1cacb68
YH		 36 * YOSHIFUJI Hideaki @USAGI : improved source address
37 * selection; consider scope,
38 * status etc.
1da177e4
LT		 39 */
40
f3213831
JP		 41#define pr_fmt(fmt) "IPv6: " fmt
42
1da177e4
LT		 43#include <linux/errno.h>
44#include <linux/types.h>
a0bffffc 45#include <linux/kernel.h>
1da177e4
LT		 46#include <linux/socket.h>
47#include <linux/sockios.h>
1da177e4
LT		 48#include <linux/net.h>
49#include <linux/in6.h>
50#include <linux/netdevice.h>
1823730f 51#include <linux/if_addr.h>
1da177e4
LT		 52#include <linux/if_arp.h>
53#include <linux/if_arcnet.h>
54#include <linux/if_infiniband.h>
55#include <linux/route.h>
56#include <linux/inetdevice.h>
57#include <linux/init.h>
5a0e3ad6 58#include <linux/slab.h>
1da177e4
LT		 59#ifdef CONFIG_SYSCTL
60#include <linux/sysctl.h>
61#endif
4fc268d2 62#include <linux/capability.h>
1da177e4
LT		 63#include <linux/delay.h>
64#include <linux/notifier.h>
543537bd 65#include <linux/string.h>
ddbe5032 66#include <linux/hash.h>
1da177e4 67
457c4cbc 68#include <net/net_namespace.h>
1da177e4
LT		 69#include <net/sock.h>
70#include <net/snmp.h>
71
06a4c1c5 72#include <net/af_ieee802154.h>
cb6bf355 73#include <net/firewire.h>
1da177e4
LT		 74#include <net/ipv6.h>
75#include <net/protocol.h>
76#include <net/ndisc.h>
77#include <net/ip6_route.h>
78#include <net/addrconf.h>
79#include <net/tcp.h>
80#include <net/ip.h>
5d620266 81#include <net/netlink.h>
f24e3d65 82#include <net/pkt_sched.h>
1da177e4
LT		 83#include <linux/if_tunnel.h>
84#include <linux/rtnetlink.h>
f3a1bfb1 85#include <linux/netconf.h>
1da177e4 86#include <linux/random.h>
e21e8467 87#include <linux/uaccess.h>
7f7d9a6b 88#include <asm/unaligned.h>
1da177e4
LT		 89
90#include <linux/proc_fs.h>
91#include <linux/seq_file.h>
bc3b2d7f 92#include <linux/export.h>
1da177e4
LT		 93
94/* Set to 3 to get tracing... */
95#define ACONF_DEBUG 2
96
97#if ACONF_DEBUG >= 3
ba3542e1 98#define ADBG(fmt, ...) printk(fmt, ##__VA_ARGS__)
1da177e4 99#else
ba3542e1 100#define ADBG(fmt, ...) do { if (0) printk(fmt, ##__VA_ARGS__); } while (0)
1da177e4
LT		 101#endif
102
103#define INFINITY_LIFE_TIME 0xFFFFFFFF
18a31e1e
TG		 104
105static inline u32 cstamp_delta(unsigned long cstamp)
106{
107 return (cstamp - INITIAL_JIFFIES) * 100UL / HZ;
108}
1da177e4
LT		 109
110#ifdef CONFIG_SYSCTL
a317a2f1 111static int addrconf_sysctl_register(struct inet6_dev *idev);
408c4768
PE		 112static void addrconf_sysctl_unregister(struct inet6_dev *idev);
113#else
a317a2f1 114static inline int addrconf_sysctl_register(struct inet6_dev *idev)
408c4768 115{
a317a2f1 116 return 0;
408c4768
PE		 117}
118
119static inline void addrconf_sysctl_unregister(struct inet6_dev *idev)
120{
121}
1da177e4
LT		 122#endif
123
eb7e0575
SD		 124static void __ipv6_regen_rndid(struct inet6_dev *idev);
125static void __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
1da177e4 126static void ipv6_regen_rndid(unsigned long data);
1da177e4 127
1b34be74 128static int ipv6_generate_eui64(u8 *eui, struct net_device *dev);
1da177e4
LT		 129static int ipv6_count_addresses(struct inet6_dev *idev);
130
131/*
132 * Configured unicast address hash table
133 */
c2e21293 134static struct hlist_head inet6_addr_lst[IN6_ADDR_HSIZE];
5c578aed 135static DEFINE_SPINLOCK(addrconf_hash_lock);
1da177e4 136
c15b1cca
HFS		 137static void addrconf_verify(void);
138static void addrconf_verify_rtnl(void);
139static void addrconf_verify_work(struct work_struct *);
1da177e4 140
c15b1cca
HFS		 141static struct workqueue_struct *addrconf_wq;
142static DECLARE_DELAYED_WORK(addr_chk_work, addrconf_verify_work);
1da177e4
LT		 143
144static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
145static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
146
93d9b7d7
JP		 147static void addrconf_type_change(struct net_device *dev,
148 unsigned long event);
1da177e4
LT		 149static int addrconf_ifdown(struct net_device *dev, int how);
150
21caa662
RK		 151static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
152 int plen,
153 const struct net_device *dev,
154 u32 flags, u32 noflags);
155
cf22f9a2 156static void addrconf_dad_start(struct inet6_ifaddr *ifp);
c15b1cca 157static void addrconf_dad_work(struct work_struct *w);
1da177e4 158static void addrconf_dad_completed(struct inet6_ifaddr *ifp);
c5e33bdd 159static void addrconf_dad_run(struct inet6_dev *idev);
1da177e4
LT		 160static void addrconf_rs_timer(unsigned long data);
161static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
162static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
163
1ab1457c 164static void inet6_prefix_notify(int event, struct inet6_dev *idev,
1da177e4 165 struct prefix_info *pinfo);
3e81c6da
DM		 166static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
167 struct net_device *dev);
1da177e4 168
888c848e 169static struct ipv6_devconf ipv6_devconf __read_mostly = {
1da177e4
LT		 170 .forwarding = 0,
171 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
172 .mtu6 = IPV6_MIN_MTU,
173 .accept_ra = 1,
174 .accept_redirects = 1,
175 .autoconf = 1,
176 .force_mld_version = 0,
fc4eba58
HFS		 177 .mldv1_unsolicited_report_interval = 10 * HZ,
178 .mldv2_unsolicited_report_interval = HZ,
1da177e4
LT		 179 .dad_transmits = 1,
180 .rtr_solicits = MAX_RTR_SOLICITATIONS,
181 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
182 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
1da177e4
LT		 183 .use_tempaddr = 0,
184 .temp_valid_lft = TEMP_VALID_LIFETIME,
185 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
186 .regen_max_retry = REGEN_MAX_RETRY,
187 .max_desync_factor = MAX_DESYNC_FACTOR,
1da177e4 188 .max_addresses = IPV6_MAX_ADDRESSES,
65f5c7c1 189 .accept_ra_defrtr = 1,
d9333196 190 .accept_ra_from_local = 0,
c4fd30eb 191 .accept_ra_pinfo = 1,
930d6ff2
YH		 192#ifdef CONFIG_IPV6_ROUTER_PREF
193 .accept_ra_rtr_pref = 1,
52e16356 194 .rtr_probe_interval = 60 * HZ,
09c884d4
YH		 195#ifdef CONFIG_IPV6_ROUTE_INFO
196 .accept_ra_rt_info_max_plen = 0,
197#endif
930d6ff2 198#endif
fbea49e1 199 .proxy_ndp = 0,
0bcbc926 200 .accept_source_route = 0, /* we do not accept RH0 by default. */
778d80be 201 .disable_ipv6 = 0,
1b34be74 202 .accept_dad = 1,
b800c3b9 203 .suppress_frag_ndisc = 1,
1da177e4
LT		 204};
205
ab32ea5d 206static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
1da177e4
LT		 207 .forwarding = 0,
208 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
209 .mtu6 = IPV6_MIN_MTU,
210 .accept_ra = 1,
211 .accept_redirects = 1,
212 .autoconf = 1,
fc4eba58
HFS		 213 .force_mld_version = 0,
214 .mldv1_unsolicited_report_interval = 10 * HZ,
215 .mldv2_unsolicited_report_interval = HZ,
1da177e4
LT		 216 .dad_transmits = 1,
217 .rtr_solicits = MAX_RTR_SOLICITATIONS,
218 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
219 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
1da177e4
LT		 220 .use_tempaddr = 0,
221 .temp_valid_lft = TEMP_VALID_LIFETIME,
222 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
223 .regen_max_retry = REGEN_MAX_RETRY,
224 .max_desync_factor = MAX_DESYNC_FACTOR,
1da177e4 225 .max_addresses = IPV6_MAX_ADDRESSES,
65f5c7c1 226 .accept_ra_defrtr = 1,
d9333196 227 .accept_ra_from_local = 0,
c4fd30eb 228 .accept_ra_pinfo = 1,
930d6ff2
YH		 229#ifdef CONFIG_IPV6_ROUTER_PREF
230 .accept_ra_rtr_pref = 1,
52e16356 231 .rtr_probe_interval = 60 * HZ,
09c884d4
YH		 232#ifdef CONFIG_IPV6_ROUTE_INFO
233 .accept_ra_rt_info_max_plen = 0,
234#endif
930d6ff2 235#endif
fbea49e1 236 .proxy_ndp = 0,
0bcbc926 237 .accept_source_route = 0, /* we do not accept RH0 by default. */
778d80be 238 .disable_ipv6 = 0,
1b34be74 239 .accept_dad = 1,
b800c3b9 240 .suppress_frag_ndisc = 1,
1da177e4
LT		 241};
242
f24e3d65 243/* Check if a valid qdisc is available */
05297949 244static inline bool addrconf_qdisc_ok(const struct net_device *dev)
f24e3d65 245{
05297949 246 return !qdisc_tx_is_noop(dev);
f24e3d65
MC		 247}
248
b7b1bfce 249static void addrconf_del_rs_timer(struct inet6_dev *idev)
1da177e4 250{
b7b1bfce
HFS		 251 if (del_timer(&idev->rs_timer))
252 __in6_dev_put(idev);
253}
254
c15b1cca 255static void addrconf_del_dad_work(struct inet6_ifaddr *ifp)
b7b1bfce 256{
c15b1cca 257 if (cancel_delayed_work(&ifp->dad_work))
1da177e4
LT		 258 __in6_ifa_put(ifp);
259}
260
b7b1bfce
HFS		 261static void addrconf_mod_rs_timer(struct inet6_dev *idev,
262 unsigned long when)
263{
264 if (!timer_pending(&idev->rs_timer))
265 in6_dev_hold(idev);
266 mod_timer(&idev->rs_timer, jiffies + when);
267}
1da177e4 268
c15b1cca
HFS		 269static void addrconf_mod_dad_work(struct inet6_ifaddr *ifp,
270 unsigned long delay)
1da177e4 271{
c15b1cca 272 if (!delayed_work_pending(&ifp->dad_work))
1da177e4 273 in6_ifa_hold(ifp);
c15b1cca 274 mod_delayed_work(addrconf_wq, &ifp->dad_work, delay);
1da177e4
LT		 275}
276
7f7d9a6b
HX		 277static int snmp6_alloc_dev(struct inet6_dev *idev)
278{
827da44c
JS		 279 int i;
280
698365fa
WC		 281 idev->stats.ipv6 = alloc_percpu(struct ipstats_mib);
282 if (!idev->stats.ipv6)
7f7d9a6b 283 goto err_ip;
827da44c
JS		 284
285 for_each_possible_cpu(i) {
286 struct ipstats_mib *addrconf_stats;
698365fa 287 addrconf_stats = per_cpu_ptr(idev->stats.ipv6, i);
827da44c 288 u64_stats_init(&addrconf_stats->syncp);
827da44c
JS		 289 }
290
291
be281e55
ED		 292 idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device),
293 GFP_KERNEL);
294 if (!idev->stats.icmpv6dev)
7f7d9a6b 295 goto err_icmp;
be281e55
ED		 296 idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device),
297 GFP_KERNEL);
298 if (!idev->stats.icmpv6msgdev)
14878f75 299 goto err_icmpmsg;
7f7d9a6b
HX		 300
301 return 0;
302
14878f75 303err_icmpmsg:
be281e55 304 kfree(idev->stats.icmpv6dev);
7f7d9a6b 305err_icmp:
698365fa 306 free_percpu(idev->stats.ipv6);
7f7d9a6b 307err_ip:
aaf70ec7 308 return -ENOMEM;
7f7d9a6b
HX		 309}
310
8e5e8f30 311static struct inet6_dev *ipv6_add_dev(struct net_device *dev)
1da177e4
LT		 312{
313 struct inet6_dev *ndev;
a317a2f1 314 int err = -ENOMEM;
1da177e4
LT		 315
316 ASSERT_RTNL();
317
318 if (dev->mtu < IPV6_MIN_MTU)
a317a2f1 319 return ERR_PTR(-EINVAL);
1da177e4 320
1ab1457c 321 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
1ab1457c 322 if (ndev == NULL)
a317a2f1 323 return ERR_PTR(err);
322f74a4
IO		 324
325 rwlock_init(&ndev->lock);
326 ndev->dev = dev;
502a2ffd 327 INIT_LIST_HEAD(&ndev->addr_list);
b7b1bfce
HFS		 328 setup_timer(&ndev->rs_timer, addrconf_rs_timer,
329 (unsigned long)ndev);
c346dca1 330 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf));
322f74a4
IO		 331 ndev->cnf.mtu6 = dev->mtu;
332 ndev->cnf.sysctl = NULL;
333 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
334 if (ndev->nd_parms == NULL) {
335 kfree(ndev);
a317a2f1 336 return ERR_PTR(err);
322f74a4 337 }
0187bdfb
BH		 338 if (ndev->cnf.forwarding)
339 dev_disable_lro(dev);
322f74a4
IO		 340 /* We refer to the device */
341 dev_hold(dev);
1da177e4 342
322f74a4 343 if (snmp6_alloc_dev(ndev) < 0) {
ba3542e1 344 ADBG(KERN_WARNING
f3213831 345 "%s: cannot allocate memory for statistics; dev=%s.\n",
ba3542e1 346 __func__, dev->name);
322f74a4 347 neigh_parms_release(&nd_tbl, ndev->nd_parms);
8603e33d
RL		 348 dev_put(dev);
349 kfree(ndev);
a317a2f1 350 return ERR_PTR(err);
322f74a4 351 }
1da177e4 352
322f74a4 353 if (snmp6_register_dev(ndev) < 0) {
ba3542e1 354 ADBG(KERN_WARNING
f3213831 355 "%s: cannot create /proc/net/dev_snmp6/%s\n",
ba3542e1 356 __func__, dev->name);
a317a2f1 357 goto err_release;
322f74a4
IO		 358 }
359
360 /* One reference from device. We must do this before
361 * we invoke __ipv6_regen_rndid().
362 */
363 in6_dev_hold(ndev);
1da177e4 364
1b34be74
YH		 365 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
366 ndev->cnf.accept_dad = -1;
367
07a93626 368#if IS_ENABLED(CONFIG_IPV6_SIT)
b077d7ab 369 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
f3213831 370 pr_info("%s: Disabled Multicast RS\n", dev->name);
b077d7ab
YH		 371 ndev->cnf.rtr_solicits = 0;
372 }
373#endif
374
372e6c8f 375 INIT_LIST_HEAD(&ndev->tempaddr_list);
b24b8a24 376 setup_timer(&ndev->regen_timer, ipv6_regen_rndid, (unsigned long)ndev);
322f74a4
IO		 377 if ((dev->flags&IFF_LOOPBACK) ||
378 dev->type == ARPHRD_TUNNEL ||
9625ed72 379 dev->type == ARPHRD_TUNNEL6 ||
0be669bb 380 dev->type == ARPHRD_SIT ||
0be669bb 381 dev->type == ARPHRD_NONE) {
322f74a4
IO		 382 ndev->cnf.use_tempaddr = -1;
383 } else {
384 in6_dev_hold(ndev);
385 ipv6_regen_rndid((unsigned long) ndev);
386 }
5d9efa7e 387
914faa14 388 ndev->token = in6addr_any;
1da177e4 389
f24e3d65 390 if (netif_running(dev) && addrconf_qdisc_ok(dev))
53aadcc9
HX		 391 ndev->if_flags |= IF_READY;
392
322f74a4
IO		 393 ipv6_mc_init_dev(ndev);
394 ndev->tstamp = jiffies;
a317a2f1
WC		 395 err = addrconf_sysctl_register(ndev);
396 if (err) {
397 ipv6_mc_destroy_dev(ndev);
398 del_timer(&ndev->regen_timer);
399 goto err_release;
400 }
30c4cf57 401 /* protected by rtnl_lock */
cf778b00 402 rcu_assign_pointer(dev->ip6_ptr, ndev);
d88ae4cc 403
2c5e8933
HFS		 404 /* Join interface-local all-node multicast group */
405 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allnodes);
406
d88ae4cc 407 /* Join all-node multicast group */
f3ee4010 408 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);
d88ae4cc 409
d6ddef9e 410 /* Join all-router multicast group if forwarding is set */
8b2aaede 411 if (ndev->cnf.forwarding && (dev->flags & IFF_MULTICAST))
d6ddef9e
LW		 412 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
413
1da177e4 414 return ndev;
a317a2f1
WC		 415
416err_release:
417 neigh_parms_release(&nd_tbl, ndev->nd_parms);
418 ndev->dead = 1;
419 in6_dev_finish_destroy(ndev);
420 return ERR_PTR(err);
1da177e4
LT		 421}
422
8e5e8f30 423static struct inet6_dev *ipv6_find_idev(struct net_device *dev)
1da177e4
LT		 424{
425 struct inet6_dev *idev;
426
427 ASSERT_RTNL();
428
e21e8467
SH		 429 idev = __in6_dev_get(dev);
430 if (!idev) {
431 idev = ipv6_add_dev(dev);
a317a2f1 432 if (IS_ERR(idev))
1da177e4
LT		 433 return NULL;
434 }
c5e33bdd 435
1da177e4
LT		 436 if (dev->flags&IFF_UP)
437 ipv6_mc_up(idev);
438 return idev;
439}
440
f3a1bfb1
ND		 441static int inet6_netconf_msgsize_devconf(int type)
442{
443 int size = NLMSG_ALIGN(sizeof(struct netconfmsg))
444 + nla_total_size(4); /* NETCONFA_IFINDEX */
445
76f8f6cb
ND		 446 /* type -1 is used for ALL */
447 if (type == -1 || type == NETCONFA_FORWARDING)
f3a1bfb1 448 size += nla_total_size(4);
b1afce95 449#ifdef CONFIG_IPV6_MROUTE
d67b8c61
ND		 450 if (type == -1 || type == NETCONFA_MC_FORWARDING)
451 size += nla_total_size(4);
b1afce95 452#endif
c92d5491 453 if (type == -1 || type == NETCONFA_PROXY_NEIGH)
454 size += nla_total_size(4);
f3a1bfb1
ND		 455
456 return size;
457}
458
459static int inet6_netconf_fill_devconf(struct sk_buff *skb, int ifindex,
460 struct ipv6_devconf *devconf, u32 portid,
461 u32 seq, int event, unsigned int flags,
462 int type)
463{
464 struct nlmsghdr *nlh;
465 struct netconfmsg *ncm;
466
467 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg),
468 flags);
469 if (nlh == NULL)
470 return -EMSGSIZE;
471
472 ncm = nlmsg_data(nlh);
473 ncm->ncm_family = AF_INET6;
474
475 if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0)
476 goto nla_put_failure;
477
76f8f6cb
ND		 478 /* type -1 is used for ALL */
479 if ((type == -1 || type == NETCONFA_FORWARDING) &&
f3a1bfb1
ND		 480 nla_put_s32(skb, NETCONFA_FORWARDING, devconf->forwarding) < 0)
481 goto nla_put_failure;
b1afce95 482#ifdef CONFIG_IPV6_MROUTE
d67b8c61
ND		 483 if ((type == -1 || type == NETCONFA_MC_FORWARDING) &&
484 nla_put_s32(skb, NETCONFA_MC_FORWARDING,
485 devconf->mc_forwarding) < 0)
486 goto nla_put_failure;
b1afce95 487#endif
c92d5491 488 if ((type == -1 || type == NETCONFA_PROXY_NEIGH) &&
489 nla_put_s32(skb, NETCONFA_PROXY_NEIGH, devconf->proxy_ndp) < 0)
490 goto nla_put_failure;
491
f3a1bfb1
ND		 492 return nlmsg_end(skb, nlh);
493
494nla_put_failure:
495 nlmsg_cancel(skb, nlh);
496 return -EMSGSIZE;
497}
498
d67b8c61
ND		 499void inet6_netconf_notify_devconf(struct net *net, int type, int ifindex,
500 struct ipv6_devconf *devconf)
f3a1bfb1
ND		 501{
502 struct sk_buff *skb;
503 int err = -ENOBUFS;
504
505 skb = nlmsg_new(inet6_netconf_msgsize_devconf(type), GFP_ATOMIC);
506 if (skb == NULL)
507 goto errout;
508
509 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 0, 0,
510 RTM_NEWNETCONF, 0, type);
511 if (err < 0) {
512 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
513 WARN_ON(err == -EMSGSIZE);
514 kfree_skb(skb);
515 goto errout;
516 }
517 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_NETCONF, NULL, GFP_ATOMIC);
518 return;
519errout:
bd779028 520 rtnl_set_sk_err(net, RTNLGRP_IPV6_NETCONF, err);
f3a1bfb1
ND		 521}
522
76f8f6cb
ND		 523static const struct nla_policy devconf_ipv6_policy[NETCONFA_MAX+1] = {
524 [NETCONFA_IFINDEX] = { .len = sizeof(int) },
525 [NETCONFA_FORWARDING] = { .len = sizeof(int) },
c92d5491 526 [NETCONFA_PROXY_NEIGH] = { .len = sizeof(int) },
76f8f6cb
ND		 527};
528
529static int inet6_netconf_get_devconf(struct sk_buff *in_skb,
661d2967 530 struct nlmsghdr *nlh)
76f8f6cb
ND		 531{
532 struct net *net = sock_net(in_skb->sk);
533 struct nlattr *tb[NETCONFA_MAX+1];
534 struct netconfmsg *ncm;
535 struct sk_buff *skb;
536 struct ipv6_devconf *devconf;
537 struct inet6_dev *in6_dev;
538 struct net_device *dev;
539 int ifindex;
540 int err;
541
542 err = nlmsg_parse(nlh, sizeof(*ncm), tb, NETCONFA_MAX,
543 devconf_ipv6_policy);
544 if (err < 0)
545 goto errout;
546
547 err = EINVAL;
548 if (!tb[NETCONFA_IFINDEX])
549 goto errout;
550
551 ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]);
552 switch (ifindex) {
553 case NETCONFA_IFINDEX_ALL:
554 devconf = net->ipv6.devconf_all;
555 break;
556 case NETCONFA_IFINDEX_DEFAULT:
557 devconf = net->ipv6.devconf_dflt;
558 break;
559 default:
560 dev = __dev_get_by_index(net, ifindex);
561 if (dev == NULL)
562 goto errout;
563 in6_dev = __in6_dev_get(dev);
564 if (in6_dev == NULL)
565 goto errout;
566 devconf = &in6_dev->cnf;
567 break;
568 }
569
570 err = -ENOBUFS;
571 skb = nlmsg_new(inet6_netconf_msgsize_devconf(-1), GFP_ATOMIC);
572 if (skb == NULL)
573 goto errout;
574
575 err = inet6_netconf_fill_devconf(skb, ifindex, devconf,
576 NETLINK_CB(in_skb).portid,
577 nlh->nlmsg_seq, RTM_NEWNETCONF, 0,
578 -1);
579 if (err < 0) {
580 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
581 WARN_ON(err == -EMSGSIZE);
582 kfree_skb(skb);
583 goto errout;
584 }
585 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
586errout:
587 return err;
588}
589
7a674200
ND		 590static int inet6_netconf_dump_devconf(struct sk_buff *skb,
591 struct netlink_callback *cb)
592{
593 struct net *net = sock_net(skb->sk);
594 int h, s_h;
595 int idx, s_idx;
596 struct net_device *dev;
597 struct inet6_dev *idev;
598 struct hlist_head *head;
599
600 s_h = cb->args[0];
601 s_idx = idx = cb->args[1];
602
603 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
604 idx = 0;
605 head = &net->dev_index_head[h];
606 rcu_read_lock();
63998ac2
ND		 607 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^
608 net->dev_base_seq;
7a674200
ND		 609 hlist_for_each_entry_rcu(dev, head, index_hlist) {
610 if (idx < s_idx)
611 goto cont;
612 idev = __in6_dev_get(dev);
613 if (!idev)
614 goto cont;
615
616 if (inet6_netconf_fill_devconf(skb, dev->ifindex,
617 &idev->cnf,
618 NETLINK_CB(cb->skb).portid,
619 cb->nlh->nlmsg_seq,
620 RTM_NEWNETCONF,
621 NLM_F_MULTI,
622 -1) <= 0) {
623 rcu_read_unlock();
624 goto done;
625 }
63998ac2 626 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
7a674200
ND		 627cont:
628 idx++;
629 }
630 rcu_read_unlock();
631 }
632 if (h == NETDEV_HASHENTRIES) {
633 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL,
634 net->ipv6.devconf_all,
635 NETLINK_CB(cb->skb).portid,
636 cb->nlh->nlmsg_seq,
637 RTM_NEWNETCONF, NLM_F_MULTI,
638 -1) <= 0)
639 goto done;
640 else
641 h++;
642 }
643 if (h == NETDEV_HASHENTRIES + 1) {
644 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT,
645 net->ipv6.devconf_dflt,
646 NETLINK_CB(cb->skb).portid,
647 cb->nlh->nlmsg_seq,
648 RTM_NEWNETCONF, NLM_F_MULTI,
649 -1) <= 0)
650 goto done;
651 else
652 h++;
653 }
654done:
655 cb->args[0] = h;
656 cb->args[1] = idx;
657
658 return skb->len;
659}
660
1da177e4
LT		 661#ifdef CONFIG_SYSCTL
662static void dev_forward_change(struct inet6_dev *idev)
663{
664 struct net_device *dev;
665 struct inet6_ifaddr *ifa;
1da177e4
LT		 666
667 if (!idev)
668 return;
669 dev = idev->dev;
0187bdfb
BH		 670 if (idev->cnf.forwarding)
671 dev_disable_lro(dev);
1a940835 672 if (dev->flags & IFF_MULTICAST) {
2c5e8933 673 if (idev->cnf.forwarding) {
f3ee4010 674 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
2c5e8933
HFS		 675 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allrouters);
676 ipv6_dev_mc_inc(dev, &in6addr_sitelocal_allrouters);
677 } else {
f3ee4010 678 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
2c5e8933
HFS		 679 ipv6_dev_mc_dec(dev, &in6addr_interfacelocal_allrouters);
680 ipv6_dev_mc_dec(dev, &in6addr_sitelocal_allrouters);
681 }
1da177e4 682 }
502a2ffd 683
684 list_for_each_entry(ifa, &idev->addr_list, if_list) {
2c12a74c
MW		 685 if (ifa->flags&IFA_F_TENTATIVE)
686 continue;
1da177e4
LT		 687 if (idev->cnf.forwarding)
688 addrconf_join_anycast(ifa);
689 else
690 addrconf_leave_anycast(ifa);
691 }
f3a1bfb1
ND		 692 inet6_netconf_notify_devconf(dev_net(dev), NETCONFA_FORWARDING,
693 dev->ifindex, &idev->cnf);
1da177e4
LT		 694}
695
696
e186932b 697static void addrconf_forward_change(struct net *net, __s32 newf)
1da177e4
LT		 698{
699 struct net_device *dev;
700 struct inet6_dev *idev;
701
4acd4945 702 for_each_netdev(net, dev) {
1da177e4
LT		 703 idev = __in6_dev_get(dev);
704 if (idev) {
e186932b
PE		 705 int changed = (!idev->cnf.forwarding) ^ (!newf);
706 idev->cnf.forwarding = newf;
1da177e4
LT		 707 if (changed)
708 dev_forward_change(idev);
709 }
1da177e4 710 }
1da177e4 711}
c8fecf22 712
013d97e9 713static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf)
c8fecf22 714{
bff16c2f 715 struct net *net;
013d97e9
FR		 716 int old;
717
718 if (!rtnl_trylock())
719 return restart_syscall();
bff16c2f
PE		 720
721 net = (struct net *)table->extra2;
013d97e9
FR		 722 old = *p;
723 *p = newf;
b325fddb 724
013d97e9 725 if (p == &net->ipv6.devconf_dflt->forwarding) {
f3a1bfb1
ND		 726 if ((!newf) ^ (!old))
727 inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING,
728 NETCONFA_IFINDEX_DEFAULT,
729 net->ipv6.devconf_dflt);
013d97e9
FR		 730 rtnl_unlock();
731 return 0;
88af182e 732 }
c8fecf22 733
e186932b 734 if (p == &net->ipv6.devconf_all->forwarding) {
e186932b
PE		 735 net->ipv6.devconf_dflt->forwarding = newf;
736 addrconf_forward_change(net, newf);
f3a1bfb1
ND		 737 if ((!newf) ^ (!old))
738 inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING,
739 NETCONFA_IFINDEX_ALL,
740 net->ipv6.devconf_all);
013d97e9 741 } else if ((!newf) ^ (!old))
c8fecf22 742 dev_forward_change((struct inet6_dev *)table->extra1);
0187bdfb 743 rtnl_unlock();
c8fecf22 744
013d97e9 745 if (newf)
7b4da532 746 rt6_purge_dflt_routers(net);
b325fddb 747 return 1;
c8fecf22 748}
1da177e4
LT		 749#endif
750
5c578aed 751/* Nobody refers to this ifaddr, destroy it */
1da177e4
LT		 752void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
753{
c2e21293 754 WARN_ON(!hlist_unhashed(&ifp->addr_lst));
547b792c 755
1da177e4 756#ifdef NET_REFCNT_DEBUG
91df42be 757 pr_debug("%s\n", __func__);
1da177e4
LT		 758#endif
759
760 in6_dev_put(ifp->idev);
761
c15b1cca
HFS		 762 if (cancel_delayed_work(&ifp->dad_work))
763 pr_notice("delayed DAD work was pending while freeing ifa=%p\n",
764 ifp);
1da177e4 765
e9d3e084 766 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
f3213831 767 pr_warn("Freeing alive inet6 address %p\n", ifp);
1da177e4
LT		 768 return;
769 }
94e187c0 770 ip6_rt_put(ifp->rt);
1da177e4 771
e5785985 772 kfree_rcu(ifp, rcu);
1da177e4
LT		 773}
774
e55ffac6
BH		 775static void
776ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
777{
502a2ffd 778 struct list_head *p;
8a6ce0c0 779 int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
e55ffac6
BH		 780
781 /*
782 * Each device address list is sorted in order of scope -
783 * global before linklocal.
784 */
502a2ffd 785 list_for_each(p, &idev->addr_list) {
786 struct inet6_ifaddr *ifa
787 = list_entry(p, struct inet6_ifaddr, if_list);
8a6ce0c0 788 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
e55ffac6
BH		 789 break;
790 }
791
b54c9b98 792 list_add_tail(&ifp->if_list, p);
e55ffac6
BH		 793}
794
ddbe5032 795static u32 inet6_addr_hash(const struct in6_addr *addr)
3eb84f49 796{
ddbe5032 797 return hash_32(ipv6_addr_hash(addr), IN6_ADDR_HSIZE_SHIFT);
3eb84f49
YH		 798}
799
1da177e4
LT		 800/* On success it returns ifp with increased reference count */
801
802static struct inet6_ifaddr *
3f8f5298
JP		 803ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
804 const struct in6_addr *peer_addr, int pfxlen,
8a226b2c 805 int scope, u32 flags, u32 valid_lft, u32 prefered_lft)
1da177e4
LT		 806{
807 struct inet6_ifaddr *ifa = NULL;
808 struct rt6_info *rt;
3a88a81d 809 unsigned int hash;
1da177e4 810 int err = 0;
d68b8270
YH		 811 int addr_type = ipv6_addr_type(addr);
812
813 if (addr_type == IPV6_ADDR_ANY ||
814 addr_type & IPV6_ADDR_MULTICAST ||
815 (!(idev->dev->flags & IFF_LOOPBACK) &&
816 addr_type & IPV6_ADDR_LOOPBACK))
817 return ERR_PTR(-EADDRNOTAVAIL);
1da177e4 818
8814c4b5 819 rcu_read_lock_bh();
1da177e4
LT		 820 if (idev->dead) {
821 err = -ENODEV; /*XXX*/
822 goto out2;
823 }
824
56d417b1 825 if (idev->cnf.disable_ipv6) {
9bdd8d40
BH		 826 err = -EACCES;
827 goto out2;
828 }
829
5c578aed 830 spin_lock(&addrconf_hash_lock);
1da177e4
LT		 831
832 /* Ignore adding duplicate addresses on an interface */
c346dca1 833 if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) {
ba3542e1 834 ADBG("ipv6_add_addr: already assigned\n");
1da177e4
LT		 835 err = -EEXIST;
836 goto out;
837 }
838
322f74a4 839 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
1da177e4
LT		 840
841 if (ifa == NULL) {
ba3542e1 842 ADBG("ipv6_add_addr: malloc failed\n");
1da177e4
LT		 843 err = -ENOBUFS;
844 goto out;
845 }
846
8f031519 847 rt = addrconf_dst_alloc(idev, addr, false);
1da177e4
LT		 848 if (IS_ERR(rt)) {
849 err = PTR_ERR(rt);
850 goto out;
851 }
852
bba24896
JP		 853 neigh_parms_data_state_setall(idev->nd_parms);
854
4e3fd7a0 855 ifa->addr = *addr;
3f8f5298
JP		 856 if (peer_addr)
857 ifa->peer_addr = *peer_addr;
1da177e4
LT		 858
859 spin_lock_init(&ifa->lock);
e9d3e084 860 spin_lock_init(&ifa->state_lock);
c15b1cca 861 INIT_DELAYED_WORK(&ifa->dad_work, addrconf_dad_work);
c2e21293 862 INIT_HLIST_NODE(&ifa->addr_lst);
1da177e4
LT		 863 ifa->scope = scope;
864 ifa->prefix_len = pfxlen;
865 ifa->flags = flags | IFA_F_TENTATIVE;
8a226b2c
JB		 866 ifa->valid_lft = valid_lft;
867 ifa->prefered_lft = prefered_lft;
1da177e4 868 ifa->cstamp = ifa->tstamp = jiffies;
617fe29d 869 ifa->tokenized = false;
1da177e4 870
57f5f544
KF		 871 ifa->rt = rt;
872
1da177e4
LT		 873 ifa->idev = idev;
874 in6_dev_hold(idev);
875 /* For caller */
876 in6_ifa_hold(ifa);
877
878 /* Add to big hash table */
ddbe5032 879 hash = inet6_addr_hash(addr);
1da177e4 880
5c578aed 881 hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]);
5c578aed 882 spin_unlock(&addrconf_hash_lock);
1da177e4
LT		 883
884 write_lock(&idev->lock);
885 /* Add to inet6_dev unicast addr list. */
e55ffac6 886 ipv6_link_dev_addr(idev, ifa);
1da177e4 887
1da177e4 888 if (ifa->flags&IFA_F_TEMPORARY) {
372e6c8f 889 list_add(&ifa->tmp_list, &idev->tempaddr_list);
1da177e4
LT		 890 in6_ifa_hold(ifa);
891 }
1da177e4 892
1da177e4
LT		 893 in6_ifa_hold(ifa);
894 write_unlock(&idev->lock);
895out2:
8814c4b5 896 rcu_read_unlock_bh();
1da177e4 897
fd92833a 898 if (likely(err == 0))
f88c91dd 899 inet6addr_notifier_call_chain(NETDEV_UP, ifa);
1da177e4
LT		 900 else {
901 kfree(ifa);
902 ifa = ERR_PTR(err);
903 }
904
905 return ifa;
906out:
5c578aed 907 spin_unlock(&addrconf_hash_lock);
1da177e4
LT		 908 goto out2;
909}
910
5b84efec
TH		 911enum cleanup_prefix_rt_t {
912 CLEANUP_PREFIX_RT_NOP, /* no cleanup action for prefix route */
913 CLEANUP_PREFIX_RT_DEL, /* delete the prefix route */
914 CLEANUP_PREFIX_RT_EXPIRE, /* update the lifetime of the prefix route */
915};
916
917/*
918 * Check, whether the prefix for ifp would still need a prefix route
919 * after deleting ifp. The function returns one of the CLEANUP_PREFIX_RT_*
920 * constants.
921 *
922 * 1) we don't purge prefix if address was not permanent.
923 * prefix is managed by its own lifetime.
924 * 2) we also don't purge, if the address was IFA_F_NOPREFIXROUTE.
925 * 3) if there are no addresses, delete prefix.
926 * 4) if there are still other permanent address(es),
927 * corresponding prefix is still permanent.
928 * 5) if there are still other addresses with IFA_F_NOPREFIXROUTE,
929 * don't purge the prefix, assume user space is managing it.
930 * 6) otherwise, update prefix lifetime to the
931 * longest valid lifetime among the corresponding
932 * addresses on the device.
933 * Note: subsequent RA will update lifetime.
934 **/
935static enum cleanup_prefix_rt_t
936check_cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long *expires)
937{
938 struct inet6_ifaddr *ifa;
939 struct inet6_dev *idev = ifp->idev;
940 unsigned long lifetime;
941 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_DEL;
942
943 *expires = jiffies;
944
945 list_for_each_entry(ifa, &idev->addr_list, if_list) {
946 if (ifa == ifp)
947 continue;
948 if (!ipv6_prefix_equal(&ifa->addr, &ifp->addr,
949 ifp->prefix_len))
950 continue;
951 if (ifa->flags & (IFA_F_PERMANENT | IFA_F_NOPREFIXROUTE))
952 return CLEANUP_PREFIX_RT_NOP;
953
954 action = CLEANUP_PREFIX_RT_EXPIRE;
955
956 spin_lock(&ifa->lock);
957
958 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
959 /*
960 * Note: Because this address is
961 * not permanent, lifetime <
962 * LONG_MAX / HZ here.
963 */
964 if (time_before(*expires, ifa->tstamp + lifetime * HZ))
965 *expires = ifa->tstamp + lifetime * HZ;
966 spin_unlock(&ifa->lock);
967 }
968
969 return action;
970}
971
972static void
973cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long expires, bool del_rt)
974{
975 struct rt6_info *rt;
976
977 rt = addrconf_get_prefix_route(&ifp->addr,
978 ifp->prefix_len,
979 ifp->idev->dev,
980 0, RTF_GATEWAY | RTF_DEFAULT);
981 if (rt) {
982 if (del_rt)
983 ip6_del_rt(rt);
984 else {
985 if (!(rt->rt6i_flags & RTF_EXPIRES))
986 rt6_set_expires(rt, expires);
987 ip6_rt_put(rt);
988 }
989 }
990}
991
992
1da177e4
LT		 993/* This function wants to get referenced ifp and releases it before return */
994
995static void ipv6_del_addr(struct inet6_ifaddr *ifp)
996{
4c5ff6a6 997 int state;
5b84efec
TH		 998 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_NOP;
999 unsigned long expires;
1da177e4 1000
c15b1cca
HFS		 1001 ASSERT_RTNL();
1002
4c5ff6a6
HX		 1003 spin_lock_bh(&ifp->state_lock);
1004 state = ifp->state;
e9d3e084 1005 ifp->state = INET6_IFADDR_STATE_DEAD;
4c5ff6a6
HX		 1006 spin_unlock_bh(&ifp->state_lock);
1007
1008 if (state == INET6_IFADDR_STATE_DEAD)
1009 goto out;
1da177e4 1010
5c578aed 1011 spin_lock_bh(&addrconf_hash_lock);
1012 hlist_del_init_rcu(&ifp->addr_lst);
5c578aed 1013 spin_unlock_bh(&addrconf_hash_lock);
1da177e4 1014
5b84efec 1015 write_lock_bh(&ifp->idev->lock);
5d9efa7e 1016
1da177e4 1017 if (ifp->flags&IFA_F_TEMPORARY) {
372e6c8f 1018 list_del(&ifp->tmp_list);
1019 if (ifp->ifpub) {
1020 in6_ifa_put(ifp->ifpub);
1021 ifp->ifpub = NULL;
1da177e4 1022 }
372e6c8f 1023 __in6_ifa_put(ifp);
1da177e4 1024 }
1da177e4 1025
5b84efec
TH		 1026 if (ifp->flags & IFA_F_PERMANENT && !(ifp->flags & IFA_F_NOPREFIXROUTE))
1027 action = check_cleanup_prefix_route(ifp, &expires);
502a2ffd 1028
5b84efec
TH		 1029 list_del_init(&ifp->if_list);
1030 __in6_ifa_put(ifp);
1031
1032 write_unlock_bh(&ifp->idev->lock);
1da177e4 1033
c15b1cca 1034 addrconf_del_dad_work(ifp);
b2238566 1035
1da177e4
LT		 1036 ipv6_ifa_notify(RTM_DELADDR, ifp);
1037
f88c91dd 1038 inet6addr_notifier_call_chain(NETDEV_DOWN, ifp);
1da177e4 1039
5b84efec
TH		 1040 if (action != CLEANUP_PREFIX_RT_NOP) {
1041 cleanup_prefix_route(ifp, expires,
1042 action == CLEANUP_PREFIX_RT_DEL);
1da177e4
LT		 1043 }
1044
c3968a85
DW		 1045 /* clean up prefsrc entries */
1046 rt6_remove_prefsrc(ifp);
4c5ff6a6 1047out:
1da177e4
LT		 1048 in6_ifa_put(ifp);
1049}
1050
1da177e4
LT		 1051static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
1052{
1053 struct inet6_dev *idev = ifp->idev;
1054 struct in6_addr addr, *tmpaddr;
76f793e3 1055 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_tstamp, age;
eac55bf9 1056 unsigned long regen_advance;
1da177e4
LT		 1057 int tmp_plen;
1058 int ret = 0;
95c385b4 1059 u32 addr_flags;
76f793e3 1060 unsigned long now = jiffies;
1da177e4 1061
53bd6749 1062 write_lock_bh(&idev->lock);
1da177e4
LT		 1063 if (ift) {
1064 spin_lock_bh(&ift->lock);
1065 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
1066 spin_unlock_bh(&ift->lock);
1067 tmpaddr = &addr;
1068 } else {
1069 tmpaddr = NULL;
1070 }
1071retry:
1072 in6_dev_hold(idev);
1073 if (idev->cnf.use_tempaddr <= 0) {
53bd6749 1074 write_unlock_bh(&idev->lock);
f3213831 1075 pr_info("%s: use_tempaddr is disabled\n", __func__);
1da177e4
LT		 1076 in6_dev_put(idev);
1077 ret = -1;
1078 goto out;
1079 }
1080 spin_lock_bh(&ifp->lock);
1081 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
1082 idev->cnf.use_tempaddr = -1; /*XXX*/
1083 spin_unlock_bh(&ifp->lock);
53bd6749 1084 write_unlock_bh(&idev->lock);
f3213831
JP		 1085 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n",
1086 __func__);
1da177e4
LT		 1087 in6_dev_put(idev);
1088 ret = -1;
1089 goto out;
1090 }
1091 in6_ifa_hold(ifp);
1092 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
eb7e0575 1093 __ipv6_try_regen_rndid(idev, tmpaddr);
1da177e4 1094 memcpy(&addr.s6_addr[8], idev->rndid, 8);
76f793e3 1095 age = (now - ifp->tstamp) / HZ;
1da177e4
LT		 1096 tmp_valid_lft = min_t(__u32,
1097 ifp->valid_lft,
7a876b0e 1098 idev->cnf.temp_valid_lft + age);
1ab1457c
YH		 1099 tmp_prefered_lft = min_t(__u32,
1100 ifp->prefered_lft,
7a876b0e 1101 idev->cnf.temp_prefered_lft + age -
784e2710 1102 idev->cnf.max_desync_factor);
1da177e4 1103 tmp_plen = ifp->prefix_len;
1da177e4
LT		 1104 tmp_tstamp = ifp->tstamp;
1105 spin_unlock_bh(&ifp->lock);
1106
eac55bf9 1107 regen_advance = idev->cnf.regen_max_retry *
7eaa48a4 1108 idev->cnf.dad_transmits *
1f9248e5 1109 NEIGH_VAR(idev->nd_parms, RETRANS_TIME) / HZ;
53bd6749 1110 write_unlock_bh(&idev->lock);
95c385b4 1111
eac55bf9
BB		 1112 /* A temporary address is created only if this calculated Preferred
1113 * Lifetime is greater than REGEN_ADVANCE time units. In particular,
1114 * an implementation must not create a temporary address with a zero
1115 * Preferred Lifetime.
ecab6701
HK		 1116 * Use age calculation as in addrconf_verify to avoid unnecessary
1117 * temporary addresses being generated.
eac55bf9 1118 */
ecab6701
HK		 1119 age = (now - tmp_tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
1120 if (tmp_prefered_lft <= regen_advance + age) {
eac55bf9
BB		 1121 in6_ifa_put(ifp);
1122 in6_dev_put(idev);
1123 ret = -1;
1124 goto out;
1125 }
1126
95c385b4
NH		 1127 addr_flags = IFA_F_TEMPORARY;
1128 /* set in addrconf_prefix_rcv() */
1129 if (ifp->flags & IFA_F_OPTIMISTIC)
1130 addr_flags |= IFA_F_OPTIMISTIC;
1131
4b08a8f1
HFS		 1132 ift = ipv6_add_addr(idev, &addr, NULL, tmp_plen,
1133 ipv6_addr_scope(&addr), addr_flags,
1134 tmp_valid_lft, tmp_prefered_lft);
1135 if (IS_ERR(ift)) {
1da177e4
LT		 1136 in6_ifa_put(ifp);
1137 in6_dev_put(idev);
f3213831 1138 pr_info("%s: retry temporary address regeneration\n", __func__);
1da177e4 1139 tmpaddr = &addr;
53bd6749 1140 write_lock_bh(&idev->lock);
1da177e4
LT		 1141 goto retry;
1142 }
1143
1144 spin_lock_bh(&ift->lock);
1145 ift->ifpub = ifp;
76f793e3 1146 ift->cstamp = now;
1da177e4
LT		 1147 ift->tstamp = tmp_tstamp;
1148 spin_unlock_bh(&ift->lock);
1149
cf22f9a2 1150 addrconf_dad_start(ift);
1da177e4
LT		 1151 in6_ifa_put(ift);
1152 in6_dev_put(idev);
1153out:
1154 return ret;
1155}
1da177e4
LT		 1156
1157/*
072047e4 1158 * Choose an appropriate source address (RFC3484)
1da177e4 1159 */
a9b05723
YH		 1160enum {
1161 IPV6_SADDR_RULE_INIT = 0,
1162 IPV6_SADDR_RULE_LOCAL,
1163 IPV6_SADDR_RULE_SCOPE,
1164 IPV6_SADDR_RULE_PREFERRED,
1165#ifdef CONFIG_IPV6_MIP6
1166 IPV6_SADDR_RULE_HOA,
1167#endif
1168 IPV6_SADDR_RULE_OIF,
1169 IPV6_SADDR_RULE_LABEL,
a9b05723 1170 IPV6_SADDR_RULE_PRIVACY,
a9b05723
YH		 1171 IPV6_SADDR_RULE_ORCHID,
1172 IPV6_SADDR_RULE_PREFIX,
1173 IPV6_SADDR_RULE_MAX
1174};
1175
072047e4 1176struct ipv6_saddr_score {
a9b05723
YH		 1177 int rule;
1178 int addr_type;
1179 struct inet6_ifaddr *ifa;
1180 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
1181 int scopedist;
1182 int matchlen;
072047e4
YH		 1183};
1184
a9b05723 1185struct ipv6_saddr_dst {
9acd9f3a 1186 const struct in6_addr *addr;
a9b05723
YH		 1187 int ifindex;
1188 int scope;
1189 int label;
7cbca67c 1190 unsigned int prefs;
a9b05723 1191};
072047e4 1192
b6f99a21 1193static inline int ipv6_saddr_preferred(int type)
1da177e4 1194{
45bb0060 1195 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
072047e4
YH		 1196 return 1;
1197 return 0;
1da177e4
LT		 1198}
1199
3de23255
BT		 1200static int ipv6_get_saddr_eval(struct net *net,
1201 struct ipv6_saddr_score *score,
a9b05723
YH		 1202 struct ipv6_saddr_dst *dst,
1203 int i)
1204{
1205 int ret;
1206
1207 if (i <= score->rule) {
1208 switch (i) {
1209 case IPV6_SADDR_RULE_SCOPE:
1210 ret = score->scopedist;
1211 break;
1212 case IPV6_SADDR_RULE_PREFIX:
1213 ret = score->matchlen;
1214 break;
1215 default:
1216 ret = !!test_bit(i, score->scorebits);
1217 }
1218 goto out;
1219 }
1220
1221 switch (i) {
1222 case IPV6_SADDR_RULE_INIT:
1223 /* Rule 0: remember if hiscore is not ready yet */
1224 ret = !!score->ifa;
1225 break;
1226 case IPV6_SADDR_RULE_LOCAL:
1227 /* Rule 1: Prefer same address */
1228 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1229 break;
1230 case IPV6_SADDR_RULE_SCOPE:
1231 /* Rule 2: Prefer appropriate scope
1232 *
1233 * ret
1234 * ^
1235 * -1 | d 15
1236 * ---+--+-+---> scope
1237 * |
1238 * | d is scope of the destination.
1239 * B-d | \
1240 * | \ <- smaller scope is better if
db9c7c39 1241 * B-15 | \ if scope is enough for destination.
a9b05723
YH		 1242 * | ret = B - scope (-1 <= scope >= d <= 15).
1243 * d-C-1 | /
1244 * |/ <- greater is better
1245 * -C / if scope is not enough for destination.
1246 * /| ret = scope - C (-1 <= d < scope <= 15).
1247 *
1248 * d - C - 1 < B -15 (for all -1 <= d <= 15).
1249 * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1250 * Assume B = 0 and we get C > 29.
1251 */
1252 ret = __ipv6_addr_src_scope(score->addr_type);
1253 if (ret >= dst->scope)
1254 ret = -ret;
1255 else
1256 ret -= 128; /* 30 is enough */
1257 score->scopedist = ret;
1258 break;
1259 case IPV6_SADDR_RULE_PREFERRED:
1260 /* Rule 3: Avoid deprecated and optimistic addresses */
1261 ret = ipv6_saddr_preferred(score->addr_type) ||
1262 !(score->ifa->flags & (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC));
1263 break;
1264#ifdef CONFIG_IPV6_MIP6
1265 case IPV6_SADDR_RULE_HOA:
7cbca67c 1266 {
a9b05723 1267 /* Rule 4: Prefer home address */
7cbca67c
YH		 1268 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1269 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
a9b05723 1270 break;
7cbca67c 1271 }
a9b05723
YH		 1272#endif
1273 case IPV6_SADDR_RULE_OIF:
1274 /* Rule 5: Prefer outgoing interface */
1275 ret = (!dst->ifindex ||
1276 dst->ifindex == score->ifa->idev->dev->ifindex);
1277 break;
1278 case IPV6_SADDR_RULE_LABEL:
1279 /* Rule 6: Prefer matching label */
3de23255
BT		 1280 ret = ipv6_addr_label(net,
1281 &score->ifa->addr, score->addr_type,
a9b05723
YH		 1282 score->ifa->idev->dev->ifindex) == dst->label;
1283 break;
a9b05723 1284 case IPV6_SADDR_RULE_PRIVACY:
7cbca67c 1285 {
a9b05723 1286 /* Rule 7: Prefer public address
25985edc 1287 * Note: prefer temporary address if use_tempaddr >= 2
a9b05723 1288 */
7cbca67c
YH		 1289 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1290 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1291 score->ifa->idev->cnf.use_tempaddr >= 2;
1292 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
a9b05723 1293 break;
7cbca67c 1294 }
a9b05723
YH		 1295 case IPV6_SADDR_RULE_ORCHID:
1296 /* Rule 8-: Prefer ORCHID vs ORCHID or
1297 * non-ORCHID vs non-ORCHID
1298 */
1299 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1300 ipv6_addr_orchid(dst->addr));
1301 break;
1302 case IPV6_SADDR_RULE_PREFIX:
1303 /* Rule 8: Use longest matching prefix */
91b4b04f
YH		 1304 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr);
1305 if (ret > score->ifa->prefix_len)
1306 ret = score->ifa->prefix_len;
1307 score->matchlen = ret;
a9b05723
YH		 1308 break;
1309 default:
1310 ret = 0;
1311 }
1312
1313 if (ret)
1314 __set_bit(i, score->scorebits);
1315 score->rule = i;
1316out:
1317 return ret;
1318}
1319
b3f644fc 1320int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev,
9acd9f3a 1321 const struct in6_addr *daddr, unsigned int prefs,
7cbca67c 1322 struct in6_addr *saddr)
1da177e4 1323{
a9b05723
YH		 1324 struct ipv6_saddr_score scores[2],
1325 *score = &scores[0], *hiscore = &scores[1];
a9b05723 1326 struct ipv6_saddr_dst dst;
072047e4 1327 struct net_device *dev;
a9b05723 1328 int dst_type;
1da177e4 1329
a9b05723
YH		 1330 dst_type = __ipv6_addr_type(daddr);
1331 dst.addr = daddr;
1332 dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1333 dst.scope = __ipv6_addr_src_scope(dst_type);
3de23255 1334 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
7cbca67c 1335 dst.prefs = prefs;
a9b05723
YH		 1336
1337 hiscore->rule = -1;
1338 hiscore->ifa = NULL;
1da177e4 1339
8814c4b5 1340 rcu_read_lock();
1da177e4 1341
c6d14c84 1342 for_each_netdev_rcu(net, dev) {
072047e4 1343 struct inet6_dev *idev;
072047e4 1344
a9b05723 1345 /* Candidate Source Address (section 4)
072047e4
YH		 1346 * - multicast and link-local destination address,
1347 * the set of candidate source address MUST only
1348 * include addresses assigned to interfaces
1349 * belonging to the same link as the outgoing
1350 * interface.
1351 * (- For site-local destination addresses, the
1352 * set of candidate source addresses MUST only
1353 * include addresses assigned to interfaces
1354 * belonging to the same site as the outgoing
1355 * interface.)
1356 */
a9b05723
YH		 1357 if (((dst_type & IPV6_ADDR_MULTICAST) ||
1358 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL) &&
1359 dst.ifindex && dev->ifindex != dst.ifindex)
072047e4 1360 continue;
1da177e4 1361
1da177e4 1362 idev = __in6_dev_get(dev);
072047e4
YH		 1363 if (!idev)
1364 continue;
1365
1366 read_lock_bh(&idev->lock);
502a2ffd 1367 list_for_each_entry(score->ifa, &idev->addr_list, if_list) {
a9b05723 1368 int i;
072047e4 1369
a9b05723 1370 /*
6b3ae80a
YH		 1371 * - Tentative Address (RFC2462 section 5.4)
1372 * - A tentative address is not considered
1373 * "assigned to an interface" in the traditional
95c385b4 1374 * sense, unless it is also flagged as optimistic.
6b3ae80a 1375 * - Candidate Source Address (section 4)
072047e4
YH		 1376 * - In any case, anycast addresses, multicast
1377 * addresses, and the unspecified address MUST
1378 * NOT be included in a candidate set.
1379 */
a9b05723
YH		 1380 if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1381 (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
6b3ae80a 1382 continue;
a9b05723
YH		 1383
1384 score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1385
1386 if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1387 score->addr_type & IPV6_ADDR_MULTICAST)) {
072047e4 1388 LIMIT_NETDEBUG(KERN_DEBUG
3b6d821c 1389 "ADDRCONF: unspecified / multicast address "
072047e4
YH		 1390 "assigned as unicast address on %s",
1391 dev->name);
1392 continue;
1393 }
1394
a9b05723
YH		 1395 score->rule = -1;
1396 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1397
1398 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1399 int minihiscore, miniscore;
1400
3de23255
BT		 1401 minihiscore = ipv6_get_saddr_eval(net, hiscore, &dst, i);
1402 miniscore = ipv6_get_saddr_eval(net, score, &dst, i);
a9b05723
YH		 1403
1404 if (minihiscore > miniscore) {
1405 if (i == IPV6_SADDR_RULE_SCOPE &&
1406 score->scopedist > 0) {
1407 /*
1408 * special case:
1409 * each remaining entry
1410 * has too small (not enough)
1411 * scope, because ifa entries
1412 * are sorted by their scope
1413 * values.
1414 */
1415 goto try_nextdev;
1416 }
1417 break;
1418 } else if (minihiscore < miniscore) {
a9b05723
YH		 1419 if (hiscore->ifa)
1420 in6_ifa_put(hiscore->ifa);
1421
1422 in6_ifa_hold(score->ifa);
1423
a0bffffc 1424 swap(hiscore, score);
a9b05723
YH		 1425
1426 /* restore our iterator */
1427 score->ifa = hiscore->ifa;
1428
1429 break;
1da177e4 1430 }
072047e4 1431 }
1da177e4 1432 }
a9b05723 1433try_nextdev:
072047e4 1434 read_unlock_bh(&idev->lock);
1da177e4 1435 }
8814c4b5 1436 rcu_read_unlock();
1da177e4 1437
a9b05723 1438 if (!hiscore->ifa)
072047e4 1439 return -EADDRNOTAVAIL;
1ab1457c 1440
4e3fd7a0 1441 *saddr = hiscore->ifa->addr;
a9b05723 1442 in6_ifa_put(hiscore->ifa);
072047e4 1443 return 0;
1da177e4 1444}
5e5f3f0f 1445EXPORT_SYMBOL(ipv6_dev_get_saddr);
1da177e4 1446
8965779d 1447int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr,
479840ff 1448 u32 banned_flags)
b7b1bfce
HFS		 1449{
1450 struct inet6_ifaddr *ifp;
1451 int err = -EADDRNOTAVAIL;
1452
602582ca
HFS		 1453 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
1454 if (ifp->scope > IFA_LINK)
1455 break;
b7b1bfce
HFS		 1456 if (ifp->scope == IFA_LINK &&
1457 !(ifp->flags & banned_flags)) {
1458 *addr = ifp->addr;
1459 err = 0;
1460 break;
1461 }
1462 }
1463 return err;
1464}
1465
95c385b4 1466int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
479840ff 1467 u32 banned_flags)
1da177e4
LT		 1468{
1469 struct inet6_dev *idev;
1470 int err = -EADDRNOTAVAIL;
1471
8814c4b5 1472 rcu_read_lock();
e21e8467
SH		 1473 idev = __in6_dev_get(dev);
1474 if (idev) {
1da177e4 1475 read_lock_bh(&idev->lock);
b7b1bfce 1476 err = __ipv6_get_lladdr(idev, addr, banned_flags);
1da177e4
LT		 1477 read_unlock_bh(&idev->lock);
1478 }
8814c4b5 1479 rcu_read_unlock();
1da177e4
LT		 1480 return err;
1481}
1482
1483static int ipv6_count_addresses(struct inet6_dev *idev)
1484{
1485 int cnt = 0;
1486 struct inet6_ifaddr *ifp;
1487
1488 read_lock_bh(&idev->lock);
502a2ffd 1489 list_for_each_entry(ifp, &idev->addr_list, if_list)
1da177e4
LT		 1490 cnt++;
1491 read_unlock_bh(&idev->lock);
1492 return cnt;
1493}
1494
b71d1d42 1495int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
2a7851bf 1496 const struct net_device *dev, int strict)
1da177e4 1497{
eedf042a 1498 struct inet6_ifaddr *ifp;
ddbe5032 1499 unsigned int hash = inet6_addr_hash(addr);
1da177e4 1500
5c578aed 1501 rcu_read_lock_bh();
b67bfe0d 1502 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
878628fb 1503 if (!net_eq(dev_net(ifp->idev->dev), net))
bfeade08 1504 continue;
1da177e4 1505 if (ipv6_addr_equal(&ifp->addr, addr) &&
eedf042a
SH		 1506 !(ifp->flags&IFA_F_TENTATIVE) &&
1507 (dev == NULL || ifp->idev->dev == dev ||
1508 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) {
1509 rcu_read_unlock_bh();
1510 return 1;
1da177e4
LT		 1511 }
1512 }
5c578aed 1513
eedf042a
SH		 1514 rcu_read_unlock_bh();
1515 return 0;
1da177e4 1516}
7159039a
YH		 1517EXPORT_SYMBOL(ipv6_chk_addr);
1518
3e81c6da
DM		 1519static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1520 struct net_device *dev)
1da177e4 1521{
ddbe5032 1522 unsigned int hash = inet6_addr_hash(addr);
c2e21293 1523 struct inet6_ifaddr *ifp;
1da177e4 1524
b67bfe0d 1525 hlist_for_each_entry(ifp, &inet6_addr_lst[hash], addr_lst) {
878628fb 1526 if (!net_eq(dev_net(ifp->idev->dev), net))
06bfe655 1527 continue;
1da177e4
LT		 1528 if (ipv6_addr_equal(&ifp->addr, addr)) {
1529 if (dev == NULL || ifp->idev->dev == dev)
3e81c6da 1530 return true;
1da177e4
LT		 1531 }
1532 }
3e81c6da 1533 return false;
1da177e4
LT		 1534}
1535
7df37ff3
CB		 1536/* Compares an address/prefix_len with addresses on device @dev.
1537 * If one is found it returns true.
1538 */
1539bool ipv6_chk_custom_prefix(const struct in6_addr *addr,
1540 const unsigned int prefix_len, struct net_device *dev)
1541{
1542 struct inet6_dev *idev;
1543 struct inet6_ifaddr *ifa;
1544 bool ret = false;
1545
1546 rcu_read_lock();
1547 idev = __in6_dev_get(dev);
1548 if (idev) {
1549 read_lock_bh(&idev->lock);
1550 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1551 ret = ipv6_prefix_equal(addr, &ifa->addr, prefix_len);
1552 if (ret)
1553 break;
1554 }
1555 read_unlock_bh(&idev->lock);
1556 }
1557 rcu_read_unlock();
1558
1559 return ret;
1560}
1561EXPORT_SYMBOL(ipv6_chk_custom_prefix);
1562
b71d1d42 1563int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev)
52eeeb84
YH		 1564{
1565 struct inet6_dev *idev;
1566 struct inet6_ifaddr *ifa;
1567 int onlink;
1568
1569 onlink = 0;
1570 rcu_read_lock();
1571 idev = __in6_dev_get(dev);
1572 if (idev) {
1573 read_lock_bh(&idev->lock);
502a2ffd 1574 list_for_each_entry(ifa, &idev->addr_list, if_list) {
52eeeb84
YH		 1575 onlink = ipv6_prefix_equal(addr, &ifa->addr,
1576 ifa->prefix_len);
1577 if (onlink)
1578 break;
1579 }
1580 read_unlock_bh(&idev->lock);
1581 }
1582 rcu_read_unlock();
1583 return onlink;
1584}
52eeeb84
YH		 1585EXPORT_SYMBOL(ipv6_chk_prefix);
1586
9acd9f3a 1587struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1cab3da6 1588 struct net_device *dev, int strict)
1da177e4 1589{
b79d1d54 1590 struct inet6_ifaddr *ifp, *result = NULL;
ddbe5032 1591 unsigned int hash = inet6_addr_hash(addr);
1da177e4 1592
5c578aed 1593 rcu_read_lock_bh();
b67bfe0d 1594 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
878628fb 1595 if (!net_eq(dev_net(ifp->idev->dev), net))
1cab3da6 1596 continue;
1da177e4
LT		 1597 if (ipv6_addr_equal(&ifp->addr, addr)) {
1598 if (dev == NULL || ifp->idev->dev == dev ||
1599 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
b79d1d54 1600 result = ifp;
1da177e4
LT		 1601 in6_ifa_hold(ifp);
1602 break;
1603 }
1604 }
1605 }
5c578aed 1606 rcu_read_unlock_bh();
1da177e4 1607
b79d1d54 1608 return result;
1da177e4
LT		 1609}
1610
1da177e4
LT		 1611/* Gets referenced address, destroys ifaddr */
1612
cc411d0b 1613static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
1da177e4 1614{
1da177e4
LT		 1615 if (ifp->flags&IFA_F_PERMANENT) {
1616 spin_lock_bh(&ifp->lock);
c15b1cca 1617 addrconf_del_dad_work(ifp);
1da177e4 1618 ifp->flags |= IFA_F_TENTATIVE;
cc411d0b
BH		 1619 if (dad_failed)
1620 ifp->flags |= IFA_F_DADFAILED;
1da177e4 1621 spin_unlock_bh(&ifp->lock);
e2577a06
HX		 1622 if (dad_failed)
1623 ipv6_ifa_notify(0, ifp);
1da177e4 1624 in6_ifa_put(ifp);
1da177e4
LT		 1625 } else if (ifp->flags&IFA_F_TEMPORARY) {
1626 struct inet6_ifaddr *ifpub;
1627 spin_lock_bh(&ifp->lock);
1628 ifpub = ifp->ifpub;
1629 if (ifpub) {
1630 in6_ifa_hold(ifpub);
1631 spin_unlock_bh(&ifp->lock);
1632 ipv6_create_tempaddr(ifpub, ifp);
1633 in6_ifa_put(ifpub);
1634 } else {
1635 spin_unlock_bh(&ifp->lock);
1636 }
1637 ipv6_del_addr(ifp);
c15b1cca 1638 } else {
1da177e4 1639 ipv6_del_addr(ifp);
c15b1cca 1640 }
1da177e4
LT		 1641}
1642
f2344a13
HX		 1643static int addrconf_dad_end(struct inet6_ifaddr *ifp)
1644{
1645 int err = -ENOENT;
1646
c15b1cca 1647 spin_lock_bh(&ifp->state_lock);
f2344a13
HX		 1648 if (ifp->state == INET6_IFADDR_STATE_DAD) {
1649 ifp->state = INET6_IFADDR_STATE_POSTDAD;
1650 err = 0;
1651 }
c15b1cca 1652 spin_unlock_bh(&ifp->state_lock);
f2344a13
HX		 1653
1654 return err;
1655}
1656
3c21edbd
YH		 1657void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1658{
1b34be74 1659 struct inet6_dev *idev = ifp->idev;
9bdd8d40 1660
853dc2e0
UB		 1661 if (addrconf_dad_end(ifp)) {
1662 in6_ifa_put(ifp);
f2344a13 1663 return;
853dc2e0 1664 }
f2344a13 1665
e87cc472
JP		 1666 net_info_ratelimited("%s: IPv6 duplicate address %pI6c detected!\n",
1667 ifp->idev->dev->name, &ifp->addr);
9bdd8d40 1668
1b34be74
YH		 1669 if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6) {
1670 struct in6_addr addr;
1671
1672 addr.s6_addr32[0] = htonl(0xfe800000);
1673 addr.s6_addr32[1] = 0;
1674
1675 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
1676 ipv6_addr_equal(&ifp->addr, &addr)) {
1677 /* DAD failed for link-local based on MAC address */
1678 idev->cnf.disable_ipv6 = 1;
9bdd8d40 1679
f3213831 1680 pr_info("%s: IPv6 being disabled!\n",
9bdd8d40 1681 ifp->idev->dev->name);
1b34be74
YH		 1682 }
1683 }
1684
c15b1cca
HFS		 1685 spin_lock_bh(&ifp->state_lock);
1686 /* transition from _POSTDAD to _ERRDAD */
1687 ifp->state = INET6_IFADDR_STATE_ERRDAD;
1688 spin_unlock_bh(&ifp->state_lock);
1689
1690 addrconf_mod_dad_work(ifp, 0);
3c21edbd 1691}
1da177e4 1692
a9ed4a29
SD		 1693/* Join to solicited addr multicast group.
1694 * caller must hold RTNL */
b71d1d42 1695void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr)
1da177e4
LT		 1696{
1697 struct in6_addr maddr;
1698
1699 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1700 return;
1701
1702 addrconf_addr_solict_mult(addr, &maddr);
1703 ipv6_dev_mc_inc(dev, &maddr);
1704}
1705
a9ed4a29 1706/* caller must hold RTNL */
b71d1d42 1707void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr)
1da177e4
LT		 1708{
1709 struct in6_addr maddr;
1710
1711 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1712 return;
1713
1714 addrconf_addr_solict_mult(addr, &maddr);
1715 __ipv6_dev_mc_dec(idev, &maddr);
1716}
1717
a9ed4a29 1718/* caller must hold RTNL */
20380731 1719static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1da177e4
LT		 1720{
1721 struct in6_addr addr;
c15b1cca 1722
88ad3149 1723 if (ifp->prefix_len >= 127) /* RFC 6164 */
2bda8a0c 1724 return;
1da177e4
LT		 1725 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1726 if (ipv6_addr_any(&addr))
1727 return;
1728 ipv6_dev_ac_inc(ifp->idev->dev, &addr);
1729}
1730
a9ed4a29 1731/* caller must hold RTNL */
20380731 1732static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1da177e4
LT		 1733{
1734 struct in6_addr addr;
c15b1cca 1735
88ad3149 1736 if (ifp->prefix_len >= 127) /* RFC 6164 */
32019e65 1737 return;
1da177e4
LT		 1738 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1739 if (ipv6_addr_any(&addr))
1740 return;
1741 __ipv6_dev_ac_dec(ifp->idev, &addr);
1742}
1743
073a8e0e
YH		 1744static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
1745{
1746 if (dev->addr_len != ETH_ALEN)
1747 return -1;
1748 memcpy(eui, dev->dev_addr, 3);
1749 memcpy(eui + 5, dev->dev_addr + 3, 3);
1750
1751 /*
1752 * The zSeries OSA network cards can be shared among various
1753 * OS instances, but the OSA cards have only one MAC address.
1754 * This leads to duplicate address conflicts in conjunction
1755 * with IPv6 if more than one instance uses the same card.
1756 *
1757 * The driver for these cards can deliver a unique 16-bit
1758 * identifier for each instance sharing the same card. It is
1759 * placed instead of 0xFFFE in the interface identifier. The
1760 * "u" bit of the interface identifier is not inverted in this
1761 * case. Hence the resulting interface identifier has local
1762 * scope according to RFC2373.
1763 */
1764 if (dev->dev_id) {
1765 eui[3] = (dev->dev_id >> 8) & 0xFF;
1766 eui[4] = dev->dev_id & 0xFF;
1767 } else {
1768 eui[3] = 0xFF;
1769 eui[4] = 0xFE;
1770 eui[0] ^= 2;
1771 }
1772 return 0;
1773}
1774
06a4c1c5 1775static int addrconf_ifid_eui64(u8 *eui, struct net_device *dev)
1776{
1777 if (dev->addr_len != IEEE802154_ADDR_LEN)
1778 return -1;
1779 memcpy(eui, dev->dev_addr, 8);
5e98a36e 1780 eui[0] ^= 2;
06a4c1c5 1781 return 0;
1782}
1783
cb6bf355
YH		 1784static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev)
1785{
1786 union fwnet_hwaddr *ha;
1787
1788 if (dev->addr_len != FWNET_ALEN)
1789 return -1;
1790
1791 ha = (union fwnet_hwaddr *)dev->dev_addr;
1792
1793 memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id));
1794 eui[0] ^= 2;
1795 return 0;
1796}
1797
073a8e0e
YH		 1798static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1799{
1800 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1801 if (dev->addr_len != ARCNET_ALEN)
1802 return -1;
1803 memset(eui, 0, 7);
8e5e8f30 1804 eui[7] = *(u8 *)dev->dev_addr;
073a8e0e
YH		 1805 return 0;
1806}
1807
1808static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1809{
1810 if (dev->addr_len != INFINIBAND_ALEN)
1811 return -1;
1812 memcpy(eui, dev->dev_addr + 12, 8);
1813 eui[0] |= 2;
1814 return 0;
1815}
1816
c61393ea 1817static int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
dfd982ba 1818{
9af28511
SH		 1819 if (addr == 0)
1820 return -1;
dfd982ba
YH		 1821 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
1822 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
1823 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
1824 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
1825 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
1826 ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
1827 eui[1] = 0;
1828 eui[2] = 0x5E;
1829 eui[3] = 0xFE;
1830 memcpy(eui + 4, &addr, 4);
1831 return 0;
1832}
dfd982ba
YH		 1833
1834static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
1835{
1836 if (dev->priv_flags & IFF_ISATAP)
1837 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1838 return -1;
1839}
1840
aee80b54 1841static int addrconf_ifid_gre(u8 *eui, struct net_device *dev)
1842{
1843 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1844}
1845
e837735e
ND		 1846static int addrconf_ifid_ip6tnl(u8 *eui, struct net_device *dev)
1847{
1848 memcpy(eui, dev->perm_addr, 3);
1849 memcpy(eui + 5, dev->perm_addr + 3, 3);
1850 eui[3] = 0xFF;
1851 eui[4] = 0xFE;
1852 eui[0] ^= 2;
1853 return 0;
1854}
1855
1da177e4
LT		 1856static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1857{
1858 switch (dev->type) {
1859 case ARPHRD_ETHER:
1860 case ARPHRD_FDDI:
073a8e0e 1861 return addrconf_ifid_eui48(eui, dev);
1da177e4 1862 case ARPHRD_ARCNET:
073a8e0e 1863 return addrconf_ifid_arcnet(eui, dev);
1da177e4 1864 case ARPHRD_INFINIBAND:
073a8e0e 1865 return addrconf_ifid_infiniband(eui, dev);
c7dc89c0 1866 case ARPHRD_SIT:
dfd982ba 1867 return addrconf_ifid_sit(eui, dev);
aee80b54 1868 case ARPHRD_IPGRE:
1869 return addrconf_ifid_gre(eui, dev);
e74bccb8 1870 case ARPHRD_6LOWPAN:
06a4c1c5 1871 case ARPHRD_IEEE802154:
1872 return addrconf_ifid_eui64(eui, dev);
cb6bf355
YH		 1873 case ARPHRD_IEEE1394:
1874 return addrconf_ifid_ieee1394(eui, dev);
e837735e
ND		 1875 case ARPHRD_TUNNEL6:
1876 return addrconf_ifid_ip6tnl(eui, dev);
1da177e4
LT		 1877 }
1878 return -1;
1879}
1880
1881static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1882{
1883 int err = -1;
1884 struct inet6_ifaddr *ifp;
1885
1886 read_lock_bh(&idev->lock);
602582ca
HFS		 1887 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
1888 if (ifp->scope > IFA_LINK)
1889 break;
1da177e4
LT		 1890 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1891 memcpy(eui, ifp->addr.s6_addr+8, 8);
1892 err = 0;
1893 break;
1894 }
1895 }
1896 read_unlock_bh(&idev->lock);
1897 return err;
1898}
1899
1da177e4 1900/* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
eb7e0575 1901static void __ipv6_regen_rndid(struct inet6_dev *idev)
1da177e4 1902{
1da177e4 1903regen:
955189ef 1904 get_random_bytes(idev->rndid, sizeof(idev->rndid));
1da177e4 1905 idev->rndid[0] &= ~0x02;
1da177e4
LT		 1906
1907 /*
1908 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1909 * check if generated address is not inappropriate
1910 *
1911 * - Reserved subnet anycast (RFC 2526)
1912 * 11111101 11....11 1xxxxxxx
c7dc89c0 1913 * - ISATAP (RFC4214) 6.1
1da177e4
LT		 1914 * 00-00-5E-FE-xx-xx-xx-xx
1915 * - value 0
1916 * - XXX: already assigned to an address on the device
1917 */
1ab1457c 1918 if (idev->rndid[0] == 0xfd &&
1da177e4
LT		 1919 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1920 (idev->rndid[7]&0x80))
1921 goto regen;
1922 if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1923 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1924 goto regen;
1925 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1926 goto regen;
1927 }
1da177e4
LT		 1928}
1929
1930static void ipv6_regen_rndid(unsigned long data)
1931{
1932 struct inet6_dev *idev = (struct inet6_dev *) data;
1933 unsigned long expires;
1934
8814c4b5 1935 rcu_read_lock_bh();
1da177e4
LT		 1936 write_lock_bh(&idev->lock);
1937
1938 if (idev->dead)
1939 goto out;
1940
eb7e0575 1941 __ipv6_regen_rndid(idev);
1ab1457c 1942
1da177e4 1943 expires = jiffies +
1ab1457c 1944 idev->cnf.temp_prefered_lft * HZ -
1f9248e5
JP		 1945 idev->cnf.regen_max_retry * idev->cnf.dad_transmits *
1946 NEIGH_VAR(idev->nd_parms, RETRANS_TIME) -
784e2710 1947 idev->cnf.max_desync_factor * HZ;
1da177e4 1948 if (time_before(expires, jiffies)) {
f3213831
JP		 1949 pr_warn("%s: too short regeneration interval; timer disabled for %s\n",
1950 __func__, idev->dev->name);
1da177e4
LT		 1951 goto out;
1952 }
1953
1954 if (!mod_timer(&idev->regen_timer, expires))
1955 in6_dev_hold(idev);
1956
1957out:
1958 write_unlock_bh(&idev->lock);
8814c4b5 1959 rcu_read_unlock_bh();
1da177e4
LT		 1960 in6_dev_put(idev);
1961}
1962
eb7e0575 1963static void __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr)
8e5e8f30 1964{
1da177e4 1965 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
eb7e0575 1966 __ipv6_regen_rndid(idev);
1da177e4 1967}
1da177e4
LT		 1968
1969/*
1970 * Add prefix route.
1971 */
1972
1973static void
1974addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
e431b8c0 1975 unsigned long expires, u32 flags)
1da177e4 1976{
86872cb5
TG		 1977 struct fib6_config cfg = {
1978 .fc_table = RT6_TABLE_PREFIX,
1979 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1980 .fc_ifindex = dev->ifindex,
1981 .fc_expires = expires,
1982 .fc_dst_len = plen,
1983 .fc_flags = RTF_UP | flags,
c346dca1 1984 .fc_nlinfo.nl_net = dev_net(dev),
f410a1fb 1985 .fc_protocol = RTPROT_KERNEL,
86872cb5 1986 };
1da177e4 1987
4e3fd7a0 1988 cfg.fc_dst = *pfx;
1da177e4
LT		 1989
1990 /* Prevent useless cloning on PtP SIT.
1991 This thing is done here expecting that the whole
1992 class of non-broadcast devices need not cloning.
1993 */
07a93626 1994#if IS_ENABLED(CONFIG_IPV6_SIT)
86872cb5
TG		 1995 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
1996 cfg.fc_flags |= RTF_NONEXTHOP;
0be669bb 1997#endif
1da177e4 1998
86872cb5 1999 ip6_route_add(&cfg);
1da177e4
LT		 2000}
2001
14ef37b6
AH		 2002
2003static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
2004 int plen,
2005 const struct net_device *dev,
2006 u32 flags, u32 noflags)
2007{
2008 struct fib6_node *fn;
2009 struct rt6_info *rt = NULL;
2010 struct fib6_table *table;
2011
2012 table = fib6_get_table(dev_net(dev), RT6_TABLE_PREFIX);
2013 if (table == NULL)
2014 return NULL;
2015
5744dd9b 2016 read_lock_bh(&table->tb6_lock);
14ef37b6
AH		 2017 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0);
2018 if (!fn)
2019 goto out;
2020 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
d1918542 2021 if (rt->dst.dev->ifindex != dev->ifindex)
14ef37b6
AH		 2022 continue;
2023 if ((rt->rt6i_flags & flags) != flags)
2024 continue;
85da53bf 2025 if ((rt->rt6i_flags & noflags) != 0)
14ef37b6
AH		 2026 continue;
2027 dst_hold(&rt->dst);
2028 break;
2029 }
2030out:
5744dd9b 2031 read_unlock_bh(&table->tb6_lock);
14ef37b6
AH		 2032 return rt;
2033}
2034
2035
1da177e4
LT		 2036/* Create "default" multicast route to the interface */
2037
2038static void addrconf_add_mroute(struct net_device *dev)
2039{
86872cb5
TG		 2040 struct fib6_config cfg = {
2041 .fc_table = RT6_TABLE_LOCAL,
2042 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2043 .fc_ifindex = dev->ifindex,
2044 .fc_dst_len = 8,
2045 .fc_flags = RTF_UP,
c346dca1 2046 .fc_nlinfo.nl_net = dev_net(dev),
86872cb5
TG		 2047 };
2048
2049 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
2050
2051 ip6_route_add(&cfg);
1da177e4
LT		 2052}
2053
1da177e4
LT		 2054static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
2055{
2056 struct inet6_dev *idev;
2057
2058 ASSERT_RTNL();
2059
e21e8467
SH		 2060 idev = ipv6_find_idev(dev);
2061 if (!idev)
64e724f6
BH		 2062 return ERR_PTR(-ENOBUFS);
2063
2064 if (idev->cnf.disable_ipv6)
2065 return ERR_PTR(-EACCES);
1da177e4
LT		 2066
2067 /* Add default multicast route */
4af04aba
LW		 2068 if (!(dev->flags & IFF_LOOPBACK))
2069 addrconf_add_mroute(dev);
1da177e4 2070
1da177e4
LT		 2071 return idev;
2072}
2073
53bd6749
JP		 2074static void manage_tempaddrs(struct inet6_dev *idev,
2075 struct inet6_ifaddr *ifp,
2076 __u32 valid_lft, __u32 prefered_lft,
2077 bool create, unsigned long now)
2078{
2079 u32 flags;
2080 struct inet6_ifaddr *ift;
2081
2082 read_lock_bh(&idev->lock);
2083 /* update all temporary addresses in the list */
2084 list_for_each_entry(ift, &idev->tempaddr_list, tmp_list) {
2085 int age, max_valid, max_prefered;
2086
2087 if (ifp != ift->ifpub)
2088 continue;
2089
2090 /* RFC 4941 section 3.3:
2091 * If a received option will extend the lifetime of a public
2092 * address, the lifetimes of temporary addresses should
2093 * be extended, subject to the overall constraint that no
2094 * temporary addresses should ever remain "valid" or "preferred"
2095 * for a time longer than (TEMP_VALID_LIFETIME) or
2096 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), respectively.
2097 */
2098 age = (now - ift->cstamp) / HZ;
2099 max_valid = idev->cnf.temp_valid_lft - age;
2100 if (max_valid < 0)
2101 max_valid = 0;
2102
2103 max_prefered = idev->cnf.temp_prefered_lft -
2104 idev->cnf.max_desync_factor - age;
2105 if (max_prefered < 0)
2106 max_prefered = 0;
2107
2108 if (valid_lft > max_valid)
2109 valid_lft = max_valid;
2110
2111 if (prefered_lft > max_prefered)
2112 prefered_lft = max_prefered;
2113
2114 spin_lock(&ift->lock);
2115 flags = ift->flags;
2116 ift->valid_lft = valid_lft;
2117 ift->prefered_lft = prefered_lft;
2118 ift->tstamp = now;
2119 if (prefered_lft > 0)
2120 ift->flags &= ~IFA_F_DEPRECATED;
2121
2122 spin_unlock(&ift->lock);
2123 if (!(flags&IFA_F_TENTATIVE))
2124 ipv6_ifa_notify(0, ift);
2125 }
2126
2127 if ((create || list_empty(&idev->tempaddr_list)) &&
2128 idev->cnf.use_tempaddr > 0) {
2129 /* When a new public address is created as described
2130 * in [ADDRCONF], also create a new temporary address.
2131 * Also create a temporary address if it's enabled but
2132 * no temporary address currently exists.
2133 */
2134 read_unlock_bh(&idev->lock);
2135 ipv6_create_tempaddr(ifp, NULL);
2136 } else {
2137 read_unlock_bh(&idev->lock);
2138 }
2139}
2140
e6bff995 2141void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao)
1da177e4
LT		 2142{
2143 struct prefix_info *pinfo;
2144 __u32 valid_lft;
2145 __u32 prefered_lft;
2146 int addr_type;
1da177e4 2147 struct inet6_dev *in6_dev;
56d417b1 2148 struct net *net = dev_net(dev);
1da177e4
LT		 2149
2150 pinfo = (struct prefix_info *) opt;
1ab1457c 2151
1da177e4 2152 if (len < sizeof(struct prefix_info)) {
ba3542e1 2153 ADBG("addrconf: prefix option too short\n");
1da177e4
LT		 2154 return;
2155 }
1ab1457c 2156
1da177e4
LT		 2157 /*
2158 * Validation checks ([ADDRCONF], page 19)
2159 */
2160
2161 addr_type = ipv6_addr_type(&pinfo->prefix);
2162
2163 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
2164 return;
2165
2166 valid_lft = ntohl(pinfo->valid);
2167 prefered_lft = ntohl(pinfo->prefered);
2168
2169 if (prefered_lft > valid_lft) {
e87cc472 2170 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n");
1da177e4
LT		 2171 return;
2172 }
2173
2174 in6_dev = in6_dev_get(dev);
2175
2176 if (in6_dev == NULL) {
e87cc472
JP		 2177 net_dbg_ratelimited("addrconf: device %s not configured\n",
2178 dev->name);
1da177e4
LT		 2179 return;
2180 }
2181
2182 /*
2183 * Two things going on here:
2184 * 1) Add routes for on-link prefixes
2185 * 2) Configure prefixes with the auto flag set
2186 */
2187
4bed72e4
YH		 2188 if (pinfo->onlink) {
2189 struct rt6_info *rt;
2190 unsigned long rt_expires;
2191
6f704992
YH		 2192 /* Avoid arithmetic overflow. Really, we could
2193 * save rt_expires in seconds, likely valid_lft,
2194 * but it would require division in fib gc, that it
2195 * not good.
2196 */
4bed72e4
YH		 2197 if (HZ > USER_HZ)
2198 rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
2199 else
2200 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
3dd4bc68 2201
4bed72e4
YH		 2202 if (addrconf_finite_timeout(rt_expires))
2203 rt_expires *= HZ;
1da177e4 2204
14ef37b6
AH		 2205 rt = addrconf_get_prefix_route(&pinfo->prefix,
2206 pinfo->prefix_len,
2207 dev,
2208 RTF_ADDRCONF | RTF_PREFIX_RT,
2209 RTF_GATEWAY | RTF_DEFAULT);
1da177e4 2210
14ef37b6 2211 if (rt) {
6f704992
YH		 2212 /* Autoconf prefix route */
2213 if (valid_lft == 0) {
2214 ip6_del_rt(rt);
2215 rt = NULL;
4bed72e4 2216 } else if (addrconf_finite_timeout(rt_expires)) {
6f704992 2217 /* not infinity */
1716a961 2218 rt6_set_expires(rt, jiffies + rt_expires);
6f704992 2219 } else {
1716a961 2220 rt6_clean_expires(rt);
1da177e4
LT		 2221 }
2222 } else if (valid_lft) {
6f704992 2223 clock_t expires = 0;
4bed72e4
YH		 2224 int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
2225 if (addrconf_finite_timeout(rt_expires)) {
6f704992
YH		 2226 /* not infinity */
2227 flags |= RTF_EXPIRES;
2228 expires = jiffies_to_clock_t(rt_expires);
2229 }
1da177e4 2230 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
6f704992 2231 dev, expires, flags);
1da177e4 2232 }
94e187c0 2233 ip6_rt_put(rt);
1da177e4
LT		 2234 }
2235
2236 /* Try to figure out our local address for this prefix */
2237
2238 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
8e5e8f30 2239 struct inet6_ifaddr *ifp;
1da177e4
LT		 2240 struct in6_addr addr;
2241 int create = 0, update_lft = 0;
617fe29d 2242 bool tokenized = false;
1da177e4
LT		 2243
2244 if (pinfo->prefix_len == 64) {
2245 memcpy(&addr, &pinfo->prefix, 8);
f53adae4
DB		 2246
2247 if (!ipv6_addr_any(&in6_dev->token)) {
2248 read_lock_bh(&in6_dev->lock);
2249 memcpy(addr.s6_addr + 8,
2250 in6_dev->token.s6_addr + 8, 8);
2251 read_unlock_bh(&in6_dev->lock);
617fe29d 2252 tokenized = true;
f53adae4
DB		 2253 } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
2254 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
1da177e4
LT		 2255 in6_dev_put(in6_dev);
2256 return;
2257 }
2258 goto ok;
2259 }
e87cc472
JP		 2260 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n",
2261 pinfo->prefix_len);
1da177e4
LT		 2262 in6_dev_put(in6_dev);
2263 return;
2264
2265ok:
2266
53b7997f 2267 ifp = ipv6_get_ifaddr(net, &addr, dev, 1);
1da177e4
LT		 2268
2269 if (ifp == NULL && valid_lft) {
2270 int max_addresses = in6_dev->cnf.max_addresses;
95c385b4
NH		 2271 u32 addr_flags = 0;
2272
2273#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2274 if (in6_dev->cnf.optimistic_dad &&
e6bff995 2275 !net->ipv6.devconf_all->forwarding && sllao)
95c385b4
NH		 2276 addr_flags = IFA_F_OPTIMISTIC;
2277#endif
1da177e4
LT		 2278
2279 /* Do not allow to create too much of autoconfigured
2280 * addresses; this would be too easy way to crash kernel.
2281 */
2282 if (!max_addresses ||
2283 ipv6_count_addresses(in6_dev) < max_addresses)
3f8f5298
JP		 2284 ifp = ipv6_add_addr(in6_dev, &addr, NULL,
2285 pinfo->prefix_len,
95c385b4 2286 addr_type&IPV6_ADDR_SCOPE_MASK,
8a226b2c
JB		 2287 addr_flags, valid_lft,
2288 prefered_lft);
1da177e4 2289
3f0d2ba0 2290 if (IS_ERR_OR_NULL(ifp)) {
1da177e4
LT		 2291 in6_dev_put(in6_dev);
2292 return;
2293 }
2294
8a226b2c
JB		 2295 update_lft = 0;
2296 create = 1;
c15b1cca
HFS		 2297 spin_lock_bh(&ifp->lock);
2298 ifp->flags |= IFA_F_MANAGETEMPADDR;
1da177e4 2299 ifp->cstamp = jiffies;
617fe29d 2300 ifp->tokenized = tokenized;
c15b1cca 2301 spin_unlock_bh(&ifp->lock);
cf22f9a2 2302 addrconf_dad_start(ifp);
1da177e4
LT		 2303 }
2304
2305 if (ifp) {
479840ff 2306 u32 flags;
1da177e4 2307 unsigned long now;
1da177e4
LT		 2308 u32 stored_lft;
2309
2310 /* update lifetime (RFC2462 5.5.3 e) */
2311 spin_lock(&ifp->lock);
2312 now = jiffies;
2313 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
2314 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
2315 else
2316 stored_lft = 0;
8a226b2c 2317 if (!update_lft && !create && stored_lft) {
c9d55d5b
PM		 2318 const u32 minimum_lft = min(
2319 stored_lft, (u32)MIN_VALID_LIFETIME);
2320 valid_lft = max(valid_lft, minimum_lft);
2321
2322 /* RFC4862 Section 5.5.3e:
2323 * "Note that the preferred lifetime of the
2324 * corresponding address is always reset to
2325 * the Preferred Lifetime in the received
2326 * Prefix Information option, regardless of
2327 * whether the valid lifetime is also reset or
2328 * ignored."
2329 *
2330 * So we should always update prefered_lft here.
2331 */
2332 update_lft = 1;
1da177e4
LT		 2333 }
2334
2335 if (update_lft) {
2336 ifp->valid_lft = valid_lft;
2337 ifp->prefered_lft = prefered_lft;
2338 ifp->tstamp = now;
2339 flags = ifp->flags;
2340 ifp->flags &= ~IFA_F_DEPRECATED;
2341 spin_unlock(&ifp->lock);
2342
2343 if (!(flags&IFA_F_TENTATIVE))
2344 ipv6_ifa_notify(0, ifp);
2345 } else
2346 spin_unlock(&ifp->lock);
2347
53bd6749
JP		 2348 manage_tempaddrs(in6_dev, ifp, valid_lft, prefered_lft,
2349 create, now);
5d9efa7e 2350
1da177e4 2351 in6_ifa_put(ifp);
c15b1cca 2352 addrconf_verify();
1da177e4
LT		 2353 }
2354 }
2355 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
2356 in6_dev_put(in6_dev);
2357}
2358
2359/*
2360 * Set destination address.
2361 * Special case for SIT interfaces where we create a new "virtual"
2362 * device.
2363 */
af284937 2364int addrconf_set_dstaddr(struct net *net, void __user *arg)
1da177e4
LT		 2365{
2366 struct in6_ifreq ireq;
2367 struct net_device *dev;
2368 int err = -EINVAL;
2369
2370 rtnl_lock();
2371
2372 err = -EFAULT;
2373 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2374 goto err_exit;
2375
af284937 2376 dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
1da177e4
LT		 2377
2378 err = -ENODEV;
2379 if (dev == NULL)
2380 goto err_exit;
2381
07a93626 2382#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4 2383 if (dev->type == ARPHRD_SIT) {
5bc3eb7e 2384 const struct net_device_ops *ops = dev->netdev_ops;
1da177e4 2385 struct ifreq ifr;
1da177e4
LT		 2386 struct ip_tunnel_parm p;
2387
2388 err = -EADDRNOTAVAIL;
2389 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2390 goto err_exit;
2391
2392 memset(&p, 0, sizeof(p));
2393 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2394 p.iph.saddr = 0;
2395 p.iph.version = 4;
2396 p.iph.ihl = 5;
2397 p.iph.protocol = IPPROTO_IPV6;
2398 p.iph.ttl = 64;
d20b3109 2399 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
1da177e4 2400
5bc3eb7e
SH		 2401 if (ops->ndo_do_ioctl) {
2402 mm_segment_t oldfs = get_fs();
2403
2404 set_fs(KERNEL_DS);
2405 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2406 set_fs(oldfs);
2407 } else
2408 err = -EOPNOTSUPP;
1da177e4
LT		 2409
2410 if (err == 0) {
2411 err = -ENOBUFS;
af284937
DL		 2412 dev = __dev_get_by_name(net, p.name);
2413 if (!dev)
1da177e4
LT		 2414 goto err_exit;
2415 err = dev_open(dev);
2416 }
2417 }
0be669bb 2418#endif
1da177e4
LT		 2419
2420err_exit:
2421 rtnl_unlock();
2422 return err;
2423}
2424
2425/*
2426 * Manual configuration of address on an interface
2427 */
479840ff
JP		 2428static int inet6_addr_add(struct net *net, int ifindex,
2429 const struct in6_addr *pfx,
caeaba79 2430 const struct in6_addr *peer_pfx,
479840ff
JP		 2431 unsigned int plen, __u32 ifa_flags,
2432 __u32 prefered_lft, __u32 valid_lft)
1da177e4
LT		 2433{
2434 struct inet6_ifaddr *ifp;
2435 struct inet6_dev *idev;
2436 struct net_device *dev;
2437 int scope;
6f704992
YH		 2438 u32 flags;
2439 clock_t expires;
4bed72e4 2440 unsigned long timeout;
1da177e4
LT		 2441
2442 ASSERT_RTNL();
1ab1457c 2443
24ef0da7
TG		 2444 if (plen > 128)
2445 return -EINVAL;
2446
0778769d
NT		 2447 /* check the lifetime */
2448 if (!valid_lft || prefered_lft > valid_lft)
2449 return -EINVAL;
2450
53bd6749
JP		 2451 if (ifa_flags & IFA_F_MANAGETEMPADDR && plen != 64)
2452 return -EINVAL;
2453
af284937
DL		 2454 dev = __dev_get_by_index(net, ifindex);
2455 if (!dev)
1da177e4 2456 return -ENODEV;
1ab1457c 2457
64e724f6
BH		 2458 idev = addrconf_add_dev(dev);
2459 if (IS_ERR(idev))
2460 return PTR_ERR(idev);
1da177e4
LT		 2461
2462 scope = ipv6_addr_scope(pfx);
2463
4bed72e4
YH		 2464 timeout = addrconf_timeout_fixup(valid_lft, HZ);
2465 if (addrconf_finite_timeout(timeout)) {
2466 expires = jiffies_to_clock_t(timeout * HZ);
2467 valid_lft = timeout;
6f704992 2468 flags = RTF_EXPIRES;
4bed72e4
YH		 2469 } else {
2470 expires = 0;
2471 flags = 0;
2472 ifa_flags |= IFA_F_PERMANENT;
6f704992 2473 }
0778769d 2474
4bed72e4
YH		 2475 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
2476 if (addrconf_finite_timeout(timeout)) {
2477 if (timeout == 0)
2478 ifa_flags |= IFA_F_DEPRECATED;
2479 prefered_lft = timeout;
2480 }
0778769d 2481
8a226b2c
JB		 2482 ifp = ipv6_add_addr(idev, pfx, peer_pfx, plen, scope, ifa_flags,
2483 valid_lft, prefered_lft);
0778769d 2484
1da177e4 2485 if (!IS_ERR(ifp)) {
761aac73
TH		 2486 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) {
2487 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
2488 expires, flags);
2489 }
2490
95c385b4
NH		 2491 /*
2492 * Note that section 3.1 of RFC 4429 indicates
2493 * that the Optimistic flag should not be set for
2494 * manually configured addresses
2495 */
cf22f9a2 2496 addrconf_dad_start(ifp);
53bd6749
JP		 2497 if (ifa_flags & IFA_F_MANAGETEMPADDR)
2498 manage_tempaddrs(idev, ifp, valid_lft, prefered_lft,
2499 true, jiffies);
1da177e4 2500 in6_ifa_put(ifp);
c15b1cca 2501 addrconf_verify_rtnl();
1da177e4
LT		 2502 return 0;
2503 }
2504
2505 return PTR_ERR(ifp);
2506}
2507
6046d5b4
HK		 2508static int inet6_addr_del(struct net *net, int ifindex, u32 ifa_flags,
2509 const struct in6_addr *pfx, unsigned int plen)
1da177e4
LT		 2510{
2511 struct inet6_ifaddr *ifp;
2512 struct inet6_dev *idev;
2513 struct net_device *dev;
1ab1457c 2514
24ef0da7
TG		 2515 if (plen > 128)
2516 return -EINVAL;
2517
af284937
DL		 2518 dev = __dev_get_by_index(net, ifindex);
2519 if (!dev)
1da177e4
LT		 2520 return -ENODEV;
2521
7eaa48a4 2522 if ((idev = __in6_dev_get(dev)) == NULL)
1da177e4
LT		 2523 return -ENXIO;
2524
2525 read_lock_bh(&idev->lock);
502a2ffd 2526 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1da177e4
LT		 2527 if (ifp->prefix_len == plen &&
2528 ipv6_addr_equal(pfx, &ifp->addr)) {
2529 in6_ifa_hold(ifp);
2530 read_unlock_bh(&idev->lock);
1ab1457c 2531
6046d5b4
HK		 2532 if (!(ifp->flags & IFA_F_TEMPORARY) &&
2533 (ifa_flags & IFA_F_MANAGETEMPADDR))
2534 manage_tempaddrs(idev, ifp, 0, 0, false,
2535 jiffies);
1da177e4 2536 ipv6_del_addr(ifp);
6046d5b4 2537 addrconf_verify_rtnl();
1da177e4
LT		 2538 return 0;
2539 }
2540 }
2541 read_unlock_bh(&idev->lock);
2542 return -EADDRNOTAVAIL;
2543}
2544
2545
af284937 2546int addrconf_add_ifaddr(struct net *net, void __user *arg)
1da177e4
LT		 2547{
2548 struct in6_ifreq ireq;
2549 int err;
1ab1457c 2550
af31f412 2551 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1da177e4 2552 return -EPERM;
1ab1457c 2553
1da177e4
LT		 2554 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2555 return -EFAULT;
2556
2557 rtnl_lock();
caeaba79 2558 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, NULL,
af284937
DL		 2559 ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2560 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
1da177e4
LT		 2561 rtnl_unlock();
2562 return err;
2563}
2564
af284937 2565int addrconf_del_ifaddr(struct net *net, void __user *arg)
1da177e4
LT		 2566{
2567 struct in6_ifreq ireq;
2568 int err;
1ab1457c 2569
af31f412 2570 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1da177e4
LT		 2571 return -EPERM;
2572
2573 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2574 return -EFAULT;
2575
2576 rtnl_lock();
6046d5b4 2577 err = inet6_addr_del(net, ireq.ifr6_ifindex, 0, &ireq.ifr6_addr,
af284937 2578 ireq.ifr6_prefixlen);
1da177e4
LT		 2579 rtnl_unlock();
2580 return err;
2581}
2582
b5f348e5
IJ		 2583static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
2584 int plen, int scope)
2585{
2586 struct inet6_ifaddr *ifp;
2587
8a226b2c 2588 ifp = ipv6_add_addr(idev, addr, NULL, plen,
07edd741
HFS		 2589 scope, IFA_F_PERMANENT,
2590 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
b5f348e5
IJ		 2591 if (!IS_ERR(ifp)) {
2592 spin_lock_bh(&ifp->lock);
2593 ifp->flags &= ~IFA_F_TENTATIVE;
2594 spin_unlock_bh(&ifp->lock);
2595 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2596 in6_ifa_put(ifp);
2597 }
2598}
2599
07a93626 2600#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4
LT		 2601static void sit_add_v4_addrs(struct inet6_dev *idev)
2602{
1da177e4
LT		 2603 struct in6_addr addr;
2604 struct net_device *dev;
c346dca1 2605 struct net *net = dev_net(idev->dev);
929c9cf3 2606 int scope, plen;
f0e2acfa 2607 u32 pflags = 0;
1da177e4
LT		 2608
2609 ASSERT_RTNL();
2610
2611 memset(&addr, 0, sizeof(struct in6_addr));
2612 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2613
2614 if (idev->dev->flags&IFF_POINTOPOINT) {
2615 addr.s6_addr32[0] = htonl(0xfe800000);
2616 scope = IFA_LINK;
929c9cf3 2617 plen = 64;
1da177e4
LT		 2618 } else {
2619 scope = IPV6_ADDR_COMPATv4;
929c9cf3 2620 plen = 96;
f0e2acfa 2621 pflags |= RTF_NONEXTHOP;
1da177e4
LT		 2622 }
2623
2624 if (addr.s6_addr32[3]) {
929c9cf3 2625 add_addr(idev, &addr, plen, scope);
f0e2acfa 2626 addrconf_prefix_route(&addr, plen, idev->dev, 0, pflags);
1da177e4
LT		 2627 return;
2628 }
2629
6fda7350 2630 for_each_netdev(net, dev) {
8e5e8f30 2631 struct in_device *in_dev = __in_dev_get_rtnl(dev);
1da177e4 2632 if (in_dev && (dev->flags & IFF_UP)) {
8e5e8f30 2633 struct in_ifaddr *ifa;
1da177e4
LT		 2634
2635 int flag = scope;
2636
2637 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
1da177e4
LT		 2638
2639 addr.s6_addr32[3] = ifa->ifa_local;
2640
2641 if (ifa->ifa_scope == RT_SCOPE_LINK)
2642 continue;
2643 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2644 if (idev->dev->flags&IFF_POINTOPOINT)
2645 continue;
2646 flag |= IFA_HOST;
2647 }
1da177e4 2648
b5f348e5 2649 add_addr(idev, &addr, plen, flag);
f0e2acfa
ND		 2650 addrconf_prefix_route(&addr, plen, idev->dev, 0,
2651 pflags);
1da177e4
LT		 2652 }
2653 }
1ab1457c 2654 }
1da177e4 2655}
0be669bb 2656#endif
1da177e4
LT		 2657
2658static void init_loopback(struct net_device *dev)
2659{
2660 struct inet6_dev *idev;
25fb6ca4
BK		 2661 struct net_device *sp_dev;
2662 struct inet6_ifaddr *sp_ifa;
2663 struct rt6_info *sp_rt;
1da177e4
LT		 2664
2665 /* ::1 */
2666
2667 ASSERT_RTNL();
2668
7eaa48a4 2669 if ((idev = ipv6_find_idev(dev)) == NULL) {
91df42be 2670 pr_debug("%s: add_dev failed\n", __func__);
1da177e4
LT		 2671 return;
2672 }
2673
b5f348e5 2674 add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
25fb6ca4
BK		 2675
2676 /* Add routes to other interface's IPv6 addresses */
2677 for_each_netdev(dev_net(dev), sp_dev) {
2678 if (!strcmp(sp_dev->name, dev->name))
2679 continue;
2680
2681 idev = __in6_dev_get(sp_dev);
2682 if (!idev)
2683 continue;
2684
2685 read_lock_bh(&idev->lock);
2686 list_for_each_entry(sp_ifa, &idev->addr_list, if_list) {
2687
2688 if (sp_ifa->flags & (IFA_F_DADFAILED | IFA_F_TENTATIVE))
2689 continue;
2690
33d99113
G		 2691 if (sp_ifa->rt) {
2692 /* This dst has been added to garbage list when
2693 * lo device down, release this obsolete dst and
2694 * reallocate a new router for ifa.
2695 */
2696 if (sp_ifa->rt->dst.obsolete > 0) {
2697 ip6_rt_put(sp_ifa->rt);
2698 sp_ifa->rt = NULL;
2699 } else {
2700 continue;
2701 }
2702 }
a881ae1f 2703
57ec0afe 2704 sp_rt = addrconf_dst_alloc(idev, &sp_ifa->addr, false);
25fb6ca4
BK		 2705
2706 /* Failure cases are ignored */
534c8779
G		 2707 if (!IS_ERR(sp_rt)) {
2708 sp_ifa->rt = sp_rt;
25fb6ca4 2709 ip6_ins_rt(sp_rt);
534c8779 2710 }
25fb6ca4
BK		 2711 }
2712 read_unlock_bh(&idev->lock);
2713 }
1da177e4
LT		 2714}
2715
b71d1d42 2716static void addrconf_add_linklocal(struct inet6_dev *idev, const struct in6_addr *addr)
1da177e4 2717{
8e5e8f30 2718 struct inet6_ifaddr *ifp;
95c385b4
NH		 2719 u32 addr_flags = IFA_F_PERMANENT;
2720
2721#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2722 if (idev->cnf.optimistic_dad &&
702beb87 2723 !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
95c385b4
NH		 2724 addr_flags |= IFA_F_OPTIMISTIC;
2725#endif
1da177e4 2726
95c385b4 2727
07edd741
HFS		 2728 ifp = ipv6_add_addr(idev, addr, NULL, 64, IFA_LINK, addr_flags,
2729 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
1da177e4 2730 if (!IS_ERR(ifp)) {
46d48046 2731 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
cf22f9a2 2732 addrconf_dad_start(ifp);
1da177e4
LT		 2733 in6_ifa_put(ifp);
2734 }
2735}
2736
bc91b0f0
JP		 2737static void addrconf_addr_gen(struct inet6_dev *idev, bool prefix_route)
2738{
2739 if (idev->addr_gen_mode == IN6_ADDR_GEN_MODE_EUI64) {
2740 struct in6_addr addr;
2741
2742 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
2743 /* addrconf_add_linklocal also adds a prefix_route and we
2744 * only need to care about prefix routes if ipv6_generate_eui64
2745 * couldn't generate one.
2746 */
2747 if (ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) == 0)
2748 addrconf_add_linklocal(idev, &addr);
2749 else if (prefix_route)
2750 addrconf_prefix_route(&addr, 64, idev->dev, 0, 0);
2751 }
2752}
2753
1da177e4
LT		 2754static void addrconf_dev_config(struct net_device *dev)
2755{
8e5e8f30 2756 struct inet6_dev *idev;
1da177e4
LT		 2757
2758 ASSERT_RTNL();
2759
74235a25
HX		 2760 if ((dev->type != ARPHRD_ETHER) &&
2761 (dev->type != ARPHRD_FDDI) &&
74235a25 2762 (dev->type != ARPHRD_ARCNET) &&
06a4c1c5 2763 (dev->type != ARPHRD_INFINIBAND) &&
cb6bf355 2764 (dev->type != ARPHRD_IEEE802154) &&
e837735e 2765 (dev->type != ARPHRD_IEEE1394) &&
e74bccb8
JR		 2766 (dev->type != ARPHRD_TUNNEL6) &&
2767 (dev->type != ARPHRD_6LOWPAN)) {
74235a25
HX		 2768 /* Alas, we support only Ethernet autoconfiguration. */
2769 return;
2770 }
2771
1da177e4 2772 idev = addrconf_add_dev(dev);
64e724f6 2773 if (IS_ERR(idev))
1da177e4
LT		 2774 return;
2775
bc91b0f0 2776 addrconf_addr_gen(idev, false);
1da177e4
LT		 2777}
2778
07a93626 2779#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4
LT		 2780static void addrconf_sit_config(struct net_device *dev)
2781{
2782 struct inet6_dev *idev;
2783
2784 ASSERT_RTNL();
2785
1ab1457c
YH		 2786 /*
2787 * Configure the tunnel with one of our IPv4
2788 * addresses... we should configure all of
1da177e4
LT		 2789 * our v4 addrs in the tunnel
2790 */
2791
7eaa48a4 2792 if ((idev = ipv6_find_idev(dev)) == NULL) {
91df42be 2793 pr_debug("%s: add_dev failed\n", __func__);
1da177e4
LT		 2794 return;
2795 }
2796
c7dc89c0 2797 if (dev->priv_flags & IFF_ISATAP) {
bc91b0f0 2798 addrconf_addr_gen(idev, false);
c7dc89c0
FT		 2799 return;
2800 }
2801
1da177e4
LT		 2802 sit_add_v4_addrs(idev);
2803
62b54dd9 2804 if (dev->flags&IFF_POINTOPOINT)
1da177e4 2805 addrconf_add_mroute(dev);
1da177e4 2806}
0be669bb 2807#endif
1da177e4 2808
07a93626 2809#if IS_ENABLED(CONFIG_NET_IPGRE)
aee80b54 2810static void addrconf_gre_config(struct net_device *dev)
2811{
2812 struct inet6_dev *idev;
aee80b54 2813
aee80b54 2814 ASSERT_RTNL();
2815
7eaa48a4 2816 if ((idev = ipv6_find_idev(dev)) == NULL) {
91df42be 2817 pr_debug("%s: add_dev failed\n", __func__);
aee80b54 2818 return;
2819 }
2820
bc91b0f0 2821 addrconf_addr_gen(idev, true);
aee80b54 2822}
2823#endif
2824
1ab1457c 2825static int addrconf_notify(struct notifier_block *this, unsigned long event,
351638e7 2826 void *ptr)
1da177e4 2827{
351638e7 2828 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
748e2d93 2829 struct inet6_dev *idev = __in6_dev_get(dev);
c5e33bdd 2830 int run_pending = 0;
b217d616 2831 int err;
1da177e4 2832
e21e8467 2833 switch (event) {
45ba9dd2 2834 case NETDEV_REGISTER:
74235a25 2835 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
45ba9dd2 2836 idev = ipv6_add_dev(dev);
a317a2f1
WC		 2837 if (IS_ERR(idev))
2838 return notifier_from_errno(PTR_ERR(idev));
45ba9dd2
YH		 2839 }
2840 break;
bcdd553f 2841
1da177e4 2842 case NETDEV_UP:
3c21edbd 2843 case NETDEV_CHANGE:
c2edacf8
JV		 2844 if (dev->flags & IFF_SLAVE)
2845 break;
2846
3c21edbd 2847 if (event == NETDEV_UP) {
f24e3d65 2848 if (!addrconf_qdisc_ok(dev)) {
3c21edbd 2849 /* device is not ready yet. */
f3213831 2850 pr_info("ADDRCONF(NETDEV_UP): %s: link is not ready\n",
3c21edbd
YH		 2851 dev->name);
2852 break;
2853 }
99081049 2854
d31c7b8f
EP		 2855 if (!idev && dev->mtu >= IPV6_MIN_MTU)
2856 idev = ipv6_add_dev(dev);
2857
a317a2f1 2858 if (!IS_ERR_OR_NULL(idev)) {
99081049 2859 idev->if_flags |= IF_READY;
e3ec6cfc
BT		 2860 run_pending = 1;
2861 }
3c21edbd 2862 } else {
f24e3d65 2863 if (!addrconf_qdisc_ok(dev)) {
3c21edbd
YH		 2864 /* device is still not ready. */
2865 break;
2866 }
2867
2868 if (idev) {
bcdd553f 2869 if (idev->if_flags & IF_READY)
3c21edbd
YH		 2870 /* device is already configured. */
2871 break;
3c21edbd
YH		 2872 idev->if_flags |= IF_READY;
2873 }
2874
f3213831
JP		 2875 pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n",
2876 dev->name);
3c21edbd 2877
c5e33bdd 2878 run_pending = 1;
3c21edbd
YH		 2879 }
2880
e21e8467 2881 switch (dev->type) {
07a93626 2882#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4
LT		 2883 case ARPHRD_SIT:
2884 addrconf_sit_config(dev);
2885 break;
aee80b54 2886#endif
07a93626 2887#if IS_ENABLED(CONFIG_NET_IPGRE)
aee80b54 2888 case ARPHRD_IPGRE:
2889 addrconf_gre_config(dev);
2890 break;
0be669bb 2891#endif
1da177e4
LT		 2892 case ARPHRD_LOOPBACK:
2893 init_loopback(dev);
2894 break;
2895
2896 default:
2897 addrconf_dev_config(dev);
2898 break;
3ff50b79 2899 }
bcdd553f 2900
a317a2f1 2901 if (!IS_ERR_OR_NULL(idev)) {
c5e33bdd
YH		 2902 if (run_pending)
2903 addrconf_dad_run(idev);
2904
bcdd553f
SH		 2905 /*
2906 * If the MTU changed during the interface down,
2907 * when the interface up, the changed MTU must be
2908 * reflected in the idev as well as routers.
1da177e4 2909 */
bcdd553f
SH		 2910 if (idev->cnf.mtu6 != dev->mtu &&
2911 dev->mtu >= IPV6_MIN_MTU) {
1da177e4
LT		 2912 rt6_mtu_change(dev, dev->mtu);
2913 idev->cnf.mtu6 = dev->mtu;
2914 }
2915 idev->tstamp = jiffies;
2916 inet6_ifinfo_notify(RTM_NEWLINK, idev);
bcdd553f
SH		 2917
2918 /*
2919 * If the changed mtu during down is lower than
2920 * IPV6_MIN_MTU stop IPv6 on this interface.
1da177e4
LT		 2921 */
2922 if (dev->mtu < IPV6_MIN_MTU)
bcdd553f 2923 addrconf_ifdown(dev, 1);
1da177e4
LT		 2924 }
2925 break;
2926
2927 case NETDEV_CHANGEMTU:
d31c7b8f 2928 if (idev && dev->mtu >= IPV6_MIN_MTU) {
1da177e4
LT		 2929 rt6_mtu_change(dev, dev->mtu);
2930 idev->cnf.mtu6 = dev->mtu;
2931 break;
2932 }
2933
d31c7b8f
EP		 2934 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2935 idev = ipv6_add_dev(dev);
a317a2f1 2936 if (!IS_ERR(idev))
d31c7b8f
EP		 2937 break;
2938 }
2939
bcdd553f 2940 /*
db9c7c39 2941 * if MTU under IPV6_MIN_MTU.
bcdd553f
SH		 2942 * Stop IPv6 on this interface.
2943 */
1da177e4
LT		 2944
2945 case NETDEV_DOWN:
2946 case NETDEV_UNREGISTER:
2947 /*
2948 * Remove all addresses from this interface.
2949 */
2950 addrconf_ifdown(dev, event != NETDEV_DOWN);
2951 break;
3c21edbd 2952
1da177e4 2953 case NETDEV_CHANGENAME:
1da177e4 2954 if (idev) {
5632c515 2955 snmp6_unregister_dev(idev);
408c4768 2956 addrconf_sysctl_unregister(idev);
a317a2f1 2957 err = addrconf_sysctl_register(idev);
b217d616
HX		 2958 if (err)
2959 return notifier_from_errno(err);
a317a2f1
WC		 2960 err = snmp6_register_dev(idev);
2961 if (err) {
2962 addrconf_sysctl_unregister(idev);
2963 return notifier_from_errno(err);
2964 }
5632c515 2965 }
1da177e4 2966 break;
bcdd553f 2967
93d9b7d7
JP		 2968 case NETDEV_PRE_TYPE_CHANGE:
2969 case NETDEV_POST_TYPE_CHANGE:
2970 addrconf_type_change(dev, event);
75c78500 2971 break;
3ff50b79 2972 }
1da177e4
LT		 2973
2974 return NOTIFY_OK;
2975}
2976
2977/*
2978 * addrconf module should be notified of a device going up
2979 */
2980static struct notifier_block ipv6_dev_notf = {
2981 .notifier_call = addrconf_notify,
1da177e4
LT		 2982};
2983
93d9b7d7 2984static void addrconf_type_change(struct net_device *dev, unsigned long event)
75c78500
MS		 2985{
2986 struct inet6_dev *idev;
2987 ASSERT_RTNL();
2988
2989 idev = __in6_dev_get(dev);
2990
93d9b7d7 2991 if (event == NETDEV_POST_TYPE_CHANGE)
75c78500 2992 ipv6_mc_remap(idev);
93d9b7d7 2993 else if (event == NETDEV_PRE_TYPE_CHANGE)
75c78500
MS		 2994 ipv6_mc_unmap(idev);
2995}
2996
1da177e4
LT		 2997static int addrconf_ifdown(struct net_device *dev, int how)
2998{
c346dca1 2999 struct net *net = dev_net(dev);
502a2ffd 3000 struct inet6_dev *idev;
3001 struct inet6_ifaddr *ifa;
73a8bd74 3002 int state, i;
1da177e4
LT		 3003
3004 ASSERT_RTNL();
3005
73a8bd74
DM		 3006 rt6_ifdown(net, dev);
3007 neigh_ifdown(&nd_tbl, dev);
1da177e4
LT		 3008
3009 idev = __in6_dev_get(dev);
3010 if (idev == NULL)
3011 return -ENODEV;
3012
bcdd553f
SH		 3013 /*
3014 * Step 1: remove reference to ipv6 device from parent device.
3015 * Do not dev_put!
1da177e4 3016 */
439e2385 3017 if (how) {
1da177e4 3018 idev->dead = 1;
8814c4b5
YH		 3019
3020 /* protected by rtnl_lock */
a9b3cd7f 3021 RCU_INIT_POINTER(dev->ip6_ptr, NULL);
1da177e4
LT		 3022
3023 /* Step 1.5: remove snmp6 entry */
3024 snmp6_unregister_dev(idev);
3025
3026 }
3027
73a8bd74
DM		 3028 /* Step 2: clear hash table */
3029 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3030 struct hlist_head *h = &inet6_addr_lst[i];
73a8bd74
DM		 3031
3032 spin_lock_bh(&addrconf_hash_lock);
3033 restart:
b67bfe0d 3034 hlist_for_each_entry_rcu(ifa, h, addr_lst) {
73a8bd74
DM		 3035 if (ifa->idev == idev) {
3036 hlist_del_init_rcu(&ifa->addr_lst);
c15b1cca 3037 addrconf_del_dad_work(ifa);
73a8bd74
DM		 3038 goto restart;
3039 }
3040 }
3041 spin_unlock_bh(&addrconf_hash_lock);
3042 }
3043
1da177e4
LT		 3044 write_lock_bh(&idev->lock);
3045
b7b1bfce
HFS		 3046 addrconf_del_rs_timer(idev);
3047
bcdd553f 3048 /* Step 2: clear flags for stateless addrconf */
439e2385 3049 if (!how)
3c21edbd 3050 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
1da177e4 3051
439e2385 3052 if (how && del_timer(&idev->regen_timer))
1da177e4
LT		 3053 in6_dev_put(idev);
3054
bcdd553f 3055 /* Step 3: clear tempaddr list */
372e6c8f 3056 while (!list_empty(&idev->tempaddr_list)) {
3057 ifa = list_first_entry(&idev->tempaddr_list,
3058 struct inet6_ifaddr, tmp_list);
3059 list_del(&ifa->tmp_list);
1da177e4
LT		 3060 write_unlock_bh(&idev->lock);
3061 spin_lock_bh(&ifa->lock);
3062
3063 if (ifa->ifpub) {
3064 in6_ifa_put(ifa->ifpub);
3065 ifa->ifpub = NULL;
3066 }
3067 spin_unlock_bh(&ifa->lock);
3068 in6_ifa_put(ifa);
3069 write_lock_bh(&idev->lock);
3070 }
8f37ada5 3071
502a2ffd 3072 while (!list_empty(&idev->addr_list)) {
3073 ifa = list_first_entry(&idev->addr_list,
3074 struct inet6_ifaddr, if_list);
c15b1cca 3075 addrconf_del_dad_work(ifa);
84e8b803 3076
73a8bd74 3077 list_del(&ifa->if_list);
84e8b803 3078
73a8bd74 3079 write_unlock_bh(&idev->lock);
84e8b803 3080
73a8bd74
DM		 3081 spin_lock_bh(&ifa->state_lock);
3082 state = ifa->state;
3083 ifa->state = INET6_IFADDR_STATE_DEAD;
3084 spin_unlock_bh(&ifa->state_lock);
9d82ca98 3085
73a8bd74
DM		 3086 if (state != INET6_IFADDR_STATE_DEAD) {
3087 __ipv6_ifa_notify(RTM_DELADDR, ifa);
f88c91dd 3088 inet6addr_notifier_call_chain(NETDEV_DOWN, ifa);
27bdb2ab 3089 }
73a8bd74 3090 in6_ifa_put(ifa);
8f37ada5 3091
73a8bd74
DM		 3092 write_lock_bh(&idev->lock);
3093 }
8f37ada5 3094
1da177e4
LT		 3095 write_unlock_bh(&idev->lock);
3096
3097 /* Step 5: Discard multicast list */
439e2385 3098 if (how)
1da177e4
LT		 3099 ipv6_mc_destroy_dev(idev);
3100 else
3101 ipv6_mc_down(idev);
3102
1da177e4 3103 idev->tstamp = jiffies;
1ab1457c 3104
bcdd553f 3105 /* Last: Shot the device (if unregistered) */
439e2385 3106 if (how) {
408c4768 3107 addrconf_sysctl_unregister(idev);
1da177e4
LT		 3108 neigh_parms_release(&nd_tbl, idev->nd_parms);
3109 neigh_ifdown(&nd_tbl, dev);
3110 in6_dev_put(idev);
3111 }
3112 return 0;
3113}
3114
3115static void addrconf_rs_timer(unsigned long data)
3116{
b7b1bfce 3117 struct inet6_dev *idev = (struct inet6_dev *)data;
caf92bc4 3118 struct net_device *dev = idev->dev;
b7b1bfce 3119 struct in6_addr lladdr;
1da177e4 3120
b7b1bfce 3121 write_lock(&idev->lock);
5b2a1953 3122 if (idev->dead || !(idev->if_flags & IF_READY))
1da177e4
LT		 3123 goto out;
3124
9ba2add3 3125 if (!ipv6_accept_ra(idev))
5b2a1953 3126 goto out;
3127
3128 /* Announcement received after solicitation was sent */
3129 if (idev->if_flags & IF_RA_RCVD)
1da177e4 3130 goto out;
1da177e4 3131
b7b1bfce 3132 if (idev->rs_probes++ < idev->cnf.rtr_solicits) {
caf92bc4
CW		 3133 write_unlock(&idev->lock);
3134 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
3135 ndisc_send_rs(dev, &lladdr,
b7b1bfce
HFS		 3136 &in6addr_linklocal_allrouters);
3137 else
caf92bc4 3138 goto put;
1da177e4 3139
caf92bc4 3140 write_lock(&idev->lock);
b7b1bfce
HFS		 3141 /* The wait after the last probe can be shorter */
3142 addrconf_mod_rs_timer(idev, (idev->rs_probes ==
3143 idev->cnf.rtr_solicits) ?
3144 idev->cnf.rtr_solicit_delay :
3145 idev->cnf.rtr_solicit_interval);
1da177e4 3146 } else {
1da177e4
LT		 3147 /*
3148 * Note: we do not support deprecated "all on-link"
3149 * assumption any longer.
3150 */
91df42be 3151 pr_debug("%s: no IPv6 routers present\n", idev->dev->name);
1da177e4
LT		 3152 }
3153
3154out:
b7b1bfce 3155 write_unlock(&idev->lock);
caf92bc4 3156put:
b7b1bfce 3157 in6_dev_put(idev);
1da177e4
LT		 3158}
3159
3160/*
3161 * Duplicate Address Detection
3162 */
3c21edbd
YH		 3163static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
3164{
3165 unsigned long rand_num;
3166 struct inet6_dev *idev = ifp->idev;
3167
95c385b4
NH		 3168 if (ifp->flags & IFA_F_OPTIMISTIC)
3169 rand_num = 0;
3170 else
63862b5b 3171 rand_num = prandom_u32() % (idev->cnf.rtr_solicit_delay ? : 1);
95c385b4 3172
b7b1bfce 3173 ifp->dad_probes = idev->cnf.dad_transmits;
c15b1cca 3174 addrconf_mod_dad_work(ifp, rand_num);
3c21edbd
YH		 3175}
3176
c15b1cca 3177static void addrconf_dad_begin(struct inet6_ifaddr *ifp)
1da177e4
LT		 3178{
3179 struct inet6_dev *idev = ifp->idev;
3180 struct net_device *dev = idev->dev;
1da177e4
LT		 3181
3182 addrconf_join_solict(dev, &ifp->addr);
3183
63862b5b 3184 prandom_seed((__force u32) ifp->addr.s6_addr32[3]);
1da177e4
LT		 3185
3186 read_lock_bh(&idev->lock);
622ccdf1 3187 spin_lock(&ifp->lock);
e9d3e084 3188 if (ifp->state == INET6_IFADDR_STATE_DEAD)
1da177e4 3189 goto out;
1da177e4
LT		 3190
3191 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
1b34be74 3192 idev->cnf.accept_dad < 1 ||
55ebaef1
NT		 3193 !(ifp->flags&IFA_F_TENTATIVE) ||
3194 ifp->flags & IFA_F_NODAD) {
cc411d0b 3195 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
21809faf 3196 spin_unlock(&ifp->lock);
1da177e4
LT		 3197 read_unlock_bh(&idev->lock);
3198
3199 addrconf_dad_completed(ifp);
3200 return;
3201 }
3202
6732bade 3203 if (!(idev->if_flags & IF_READY)) {
21809faf 3204 spin_unlock(&ifp->lock);
6732bade 3205 read_unlock_bh(&idev->lock);
3c21edbd 3206 /*
590a9887 3207 * If the device is not ready:
3c21edbd
YH		 3208 * - keep it tentative if it is a permanent address.
3209 * - otherwise, kill it.
3210 */
3211 in6_ifa_hold(ifp);
cc411d0b 3212 addrconf_dad_stop(ifp, 0);
6732bade 3213 return;
3c21edbd 3214 }
95c385b4
NH		 3215
3216 /*
3217 * Optimistic nodes can start receiving
3218 * Frames right away
3219 */
e21e8467 3220 if (ifp->flags & IFA_F_OPTIMISTIC)
95c385b4
NH		 3221 ip6_ins_rt(ifp->rt);
3222
6732bade 3223 addrconf_dad_kick(ifp);
1da177e4 3224out:
622ccdf1 3225 spin_unlock(&ifp->lock);
1da177e4
LT		 3226 read_unlock_bh(&idev->lock);
3227}
3228
c15b1cca 3229static void addrconf_dad_start(struct inet6_ifaddr *ifp)
1da177e4 3230{
c15b1cca
HFS		 3231 bool begin_dad = false;
3232
3233 spin_lock_bh(&ifp->state_lock);
3234 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
3235 ifp->state = INET6_IFADDR_STATE_PREDAD;
3236 begin_dad = true;
3237 }
3238 spin_unlock_bh(&ifp->state_lock);
3239
3240 if (begin_dad)
3241 addrconf_mod_dad_work(ifp, 0);
3242}
3243
3244static void addrconf_dad_work(struct work_struct *w)
3245{
3246 struct inet6_ifaddr *ifp = container_of(to_delayed_work(w),
3247 struct inet6_ifaddr,
3248 dad_work);
1da177e4 3249 struct inet6_dev *idev = ifp->idev;
1da177e4
LT		 3250 struct in6_addr mcaddr;
3251
c15b1cca
HFS		 3252 enum {
3253 DAD_PROCESS,
3254 DAD_BEGIN,
3255 DAD_ABORT,
3256 } action = DAD_PROCESS;
3257
3258 rtnl_lock();
3259
3260 spin_lock_bh(&ifp->state_lock);
3261 if (ifp->state == INET6_IFADDR_STATE_PREDAD) {
3262 action = DAD_BEGIN;
3263 ifp->state = INET6_IFADDR_STATE_DAD;
3264 } else if (ifp->state == INET6_IFADDR_STATE_ERRDAD) {
3265 action = DAD_ABORT;
3266 ifp->state = INET6_IFADDR_STATE_POSTDAD;
3267 }
3268 spin_unlock_bh(&ifp->state_lock);
3269
3270 if (action == DAD_BEGIN) {
3271 addrconf_dad_begin(ifp);
3272 goto out;
3273 } else if (action == DAD_ABORT) {
3274 addrconf_dad_stop(ifp, 1);
3275 goto out;
3276 }
3277
b7b1bfce 3278 if (!ifp->dad_probes && addrconf_dad_end(ifp))
f2344a13
HX		 3279 goto out;
3280
c15b1cca 3281 write_lock_bh(&idev->lock);
122e4519 3282 if (idev->dead || !(idev->if_flags & IF_READY)) {
c15b1cca 3283 write_unlock_bh(&idev->lock);
1da177e4
LT		 3284 goto out;
3285 }
21809faf 3286
3287 spin_lock(&ifp->lock);
622ccdf1
HX		 3288 if (ifp->state == INET6_IFADDR_STATE_DEAD) {
3289 spin_unlock(&ifp->lock);
c15b1cca 3290 write_unlock_bh(&idev->lock);
622ccdf1
HX		 3291 goto out;
3292 }
3293
b7b1bfce 3294 if (ifp->dad_probes == 0) {
1da177e4
LT		 3295 /*
3296 * DAD was successful
3297 */
3298
cc411d0b 3299 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
21809faf 3300 spin_unlock(&ifp->lock);
c15b1cca 3301 write_unlock_bh(&idev->lock);
1da177e4
LT		 3302
3303 addrconf_dad_completed(ifp);
3304
3305 goto out;
3306 }
3307
b7b1bfce 3308 ifp->dad_probes--;
c15b1cca
HFS		 3309 addrconf_mod_dad_work(ifp,
3310 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME));
21809faf 3311 spin_unlock(&ifp->lock);
c15b1cca 3312 write_unlock_bh(&idev->lock);
1da177e4
LT		 3313
3314 /* send a neighbour solicitation for our addr */
1da177e4 3315 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
d7aabf22 3316 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &in6addr_any);
1da177e4
LT		 3317out:
3318 in6_ifa_put(ifp);
c15b1cca 3319 rtnl_unlock();
1da177e4
LT		 3320}
3321
11ffff75
HFS		 3322/* ifp->idev must be at least read locked */
3323static bool ipv6_lonely_lladdr(struct inet6_ifaddr *ifp)
3324{
3325 struct inet6_ifaddr *ifpiter;
3326 struct inet6_dev *idev = ifp->idev;
3327
602582ca
HFS		 3328 list_for_each_entry_reverse(ifpiter, &idev->addr_list, if_list) {
3329 if (ifpiter->scope > IFA_LINK)
3330 break;
11ffff75
HFS		 3331 if (ifp != ifpiter && ifpiter->scope == IFA_LINK &&
3332 (ifpiter->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE|
3333 IFA_F_OPTIMISTIC|IFA_F_DADFAILED)) ==
3334 IFA_F_PERMANENT)
3335 return false;
3336 }
3337 return true;
3338}
3339
1da177e4
LT		 3340static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
3341{
e21e8467 3342 struct net_device *dev = ifp->idev->dev;
b7b1bfce 3343 struct in6_addr lladdr;
b173ee48 3344 bool send_rs, send_mld;
b7b1bfce 3345
c15b1cca 3346 addrconf_del_dad_work(ifp);
1da177e4
LT		 3347
3348 /*
3349 * Configure the address for reception. Now it is valid.
3350 */
3351
3352 ipv6_ifa_notify(RTM_NEWADDR, ifp);
3353
026359bc
TA		 3354 /* If added prefix is link local and we are prepared to process
3355 router advertisements, start sending router solicitations.
1da177e4
LT		 3356 */
3357
1ec047eb 3358 read_lock_bh(&ifp->idev->lock);
11ffff75 3359 send_mld = ifp->scope == IFA_LINK && ipv6_lonely_lladdr(ifp);
b173ee48
HFS		 3360 send_rs = send_mld &&
3361 ipv6_accept_ra(ifp->idev) &&
1ec047eb 3362 ifp->idev->cnf.rtr_solicits > 0 &&
b173ee48 3363 (dev->flags&IFF_LOOPBACK) == 0;
1ec047eb
HFS		 3364 read_unlock_bh(&ifp->idev->lock);
3365
b173ee48
HFS		 3366 /* While dad is in progress mld report's source address is in6_addrany.
3367 * Resend with proper ll now.
3368 */
3369 if (send_mld)
3370 ipv6_mc_dad_complete(ifp->idev);
3371
1ec047eb 3372 if (send_rs) {
1da177e4
LT		 3373 /*
3374 * If a host as already performed a random delay
3375 * [...] as part of DAD [...] there is no need
3376 * to delay again before sending the first RS
3377 */
1ec047eb 3378 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
b7b1bfce 3379 return;
1ec047eb 3380 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters);
1da177e4 3381
b7b1bfce
HFS		 3382 write_lock_bh(&ifp->idev->lock);
3383 spin_lock(&ifp->lock);
3384 ifp->idev->rs_probes = 1;
1da177e4 3385 ifp->idev->if_flags |= IF_RS_SENT;
b7b1bfce
HFS		 3386 addrconf_mod_rs_timer(ifp->idev,
3387 ifp->idev->cnf.rtr_solicit_interval);
3388 spin_unlock(&ifp->lock);
3389 write_unlock_bh(&ifp->idev->lock);
1da177e4
LT		 3390 }
3391}
3392
e21e8467
SH		 3393static void addrconf_dad_run(struct inet6_dev *idev)
3394{
c5e33bdd
YH		 3395 struct inet6_ifaddr *ifp;
3396
3397 read_lock_bh(&idev->lock);
502a2ffd 3398 list_for_each_entry(ifp, &idev->addr_list, if_list) {
21809faf 3399 spin_lock(&ifp->lock);
f2344a13
HX		 3400 if (ifp->flags & IFA_F_TENTATIVE &&
3401 ifp->state == INET6_IFADDR_STATE_DAD)
3402 addrconf_dad_kick(ifp);
21809faf 3403 spin_unlock(&ifp->lock);
c5e33bdd
YH		 3404 }
3405 read_unlock_bh(&idev->lock);
3406}
3407
1da177e4
LT		 3408#ifdef CONFIG_PROC_FS
3409struct if6_iter_state {
3c40090a 3410 struct seq_net_private p;
1da177e4 3411 int bucket;
1d578303 3412 int offset;
1da177e4
LT		 3413};
3414
1d578303 3415static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos)
1da177e4
LT		 3416{
3417 struct inet6_ifaddr *ifa = NULL;
3418 struct if6_iter_state *state = seq->private;
1218854a 3419 struct net *net = seq_file_net(seq);
1d578303 3420 int p = 0;
1da177e4 3421
1d578303
MM		 3422 /* initial bucket if pos is 0 */
3423 if (pos == 0) {
3424 state->bucket = 0;
3425 state->offset = 0;
3426 }
3427
3428 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
b67bfe0d 3429 hlist_for_each_entry_rcu_bh(ifa, &inet6_addr_lst[state->bucket],
1d578303 3430 addr_lst) {
9f0d3c27
ED		 3431 if (!net_eq(dev_net(ifa->idev->dev), net))
3432 continue;
1d578303
MM		 3433 /* sync with offset */
3434 if (p < state->offset) {
3435 p++;
3436 continue;
3437 }
3438 state->offset++;
9f0d3c27 3439 return ifa;
1d578303
MM		 3440 }
3441
3442 /* prepare for next bucket */
3443 state->offset = 0;
3444 p = 0;
1da177e4 3445 }
c2e21293 3446 return NULL;
1da177e4
LT		 3447}
3448
c2e21293 3449static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
3450 struct inet6_ifaddr *ifa)
1da177e4
LT		 3451{
3452 struct if6_iter_state *state = seq->private;
1218854a 3453 struct net *net = seq_file_net(seq);
1da177e4 3454
b67bfe0d 3455 hlist_for_each_entry_continue_rcu_bh(ifa, addr_lst) {
9f0d3c27
ED		 3456 if (!net_eq(dev_net(ifa->idev->dev), net))
3457 continue;
1d578303 3458 state->offset++;
9f0d3c27 3459 return ifa;
1d578303 3460 }
3c40090a 3461
c2e21293 3462 while (++state->bucket < IN6_ADDR_HSIZE) {
1d578303 3463 state->offset = 0;
b67bfe0d 3464 hlist_for_each_entry_rcu_bh(ifa,
c2e21293 3465 &inet6_addr_lst[state->bucket], addr_lst) {
9f0d3c27
ED		 3466 if (!net_eq(dev_net(ifa->idev->dev), net))
3467 continue;
1d578303 3468 state->offset++;
9f0d3c27 3469 return ifa;
c2e21293 3470 }
1da177e4 3471 }
3c40090a 3472
c2e21293 3473 return NULL;
1da177e4
LT		 3474}
3475
1da177e4 3476static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
4f70ecca 3477 __acquires(rcu_bh)
1da177e4 3478{
5c578aed 3479 rcu_read_lock_bh();
1d578303 3480 return if6_get_first(seq, *pos);
1da177e4
LT		 3481}
3482
3483static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3484{
3485 struct inet6_ifaddr *ifa;
3486
3487 ifa = if6_get_next(seq, v);
3488 ++*pos;
3489 return ifa;
3490}
3491
3492static void if6_seq_stop(struct seq_file *seq, void *v)
4f70ecca 3493 __releases(rcu_bh)
1da177e4 3494{
5c578aed 3495 rcu_read_unlock_bh();
1da177e4
LT		 3496}
3497
3498static int if6_seq_show(struct seq_file *seq, void *v)
3499{
3500 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
971a351c 3501 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
b071195d 3502 &ifp->addr,
1da177e4
LT		 3503 ifp->idev->dev->ifindex,
3504 ifp->prefix_len,
3505 ifp->scope,
971a351c 3506 (u8) ifp->flags,
1da177e4
LT		 3507 ifp->idev->dev->name);
3508 return 0;
3509}
3510
56b3d975 3511static const struct seq_operations if6_seq_ops = {
1da177e4
LT		 3512 .start = if6_seq_start,
3513 .next = if6_seq_next,
3514 .show = if6_seq_show,
3515 .stop = if6_seq_stop,
3516};
3517
3518static int if6_seq_open(struct inode *inode, struct file *file)
3519{
3c40090a
DL		 3520 return seq_open_net(inode, file, &if6_seq_ops,
3521 sizeof(struct if6_iter_state));
1da177e4
LT		 3522}
3523
9a32144e 3524static const struct file_operations if6_fops = {
1da177e4
LT		 3525 .owner = THIS_MODULE,
3526 .open = if6_seq_open,
3527 .read = seq_read,
3528 .llseek = seq_lseek,
3c40090a 3529 .release = seq_release_net,
1da177e4
LT		 3530};
3531
2c8c1e72 3532static int __net_init if6_proc_net_init(struct net *net)
1da177e4 3533{
d4beaa66 3534 if (!proc_create("if_inet6", S_IRUGO, net->proc_net, &if6_fops))
1da177e4
LT		 3535 return -ENOMEM;
3536 return 0;
3537}
3538
2c8c1e72 3539static void __net_exit if6_proc_net_exit(struct net *net)
3c40090a 3540{
ece31ffd 3541 remove_proc_entry("if_inet6", net->proc_net);
3c40090a
DL		 3542}
3543
3544static struct pernet_operations if6_proc_net_ops = {
3545 .init = if6_proc_net_init,
3546 .exit = if6_proc_net_exit,
3547};
3548
3549int __init if6_proc_init(void)
3550{
3551 return register_pernet_subsys(&if6_proc_net_ops);
3552}
3553
1da177e4
LT		 3554void if6_proc_exit(void)
3555{
3c40090a 3556 unregister_pernet_subsys(&if6_proc_net_ops);
1da177e4
LT		 3557}
3558#endif /* CONFIG_PROC_FS */
3559
07a93626 3560#if IS_ENABLED(CONFIG_IPV6_MIP6)
3b9f9a1c 3561/* Check if address is a home address configured on any interface. */
b71d1d42 3562int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr)
3b9f9a1c
NT		 3563{
3564 int ret = 0;
c2e21293 3565 struct inet6_ifaddr *ifp = NULL;
ddbe5032 3566 unsigned int hash = inet6_addr_hash(addr);
c2e21293 3567
5c578aed 3568 rcu_read_lock_bh();
b67bfe0d 3569 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
878628fb 3570 if (!net_eq(dev_net(ifp->idev->dev), net))
389f6612 3571 continue;
caad295f 3572 if (ipv6_addr_equal(&ifp->addr, addr) &&
3b9f9a1c
NT		 3573 (ifp->flags & IFA_F_HOMEADDRESS)) {
3574 ret = 1;
3575 break;
3576 }
3577 }
5c578aed 3578 rcu_read_unlock_bh();
3b9f9a1c
NT		 3579 return ret;
3580}
3581#endif
3582
1da177e4
LT		 3583/*
3584 * Periodic address status verification
3585 */
3586
c15b1cca 3587static void addrconf_verify_rtnl(void)
1da177e4 3588{
b2db7564 3589 unsigned long now, next, next_sec, next_sched;
1da177e4 3590 struct inet6_ifaddr *ifp;
1da177e4
LT		 3591 int i;
3592
c15b1cca
HFS		 3593 ASSERT_RTNL();
3594
5c578aed 3595 rcu_read_lock_bh();
1da177e4 3596 now = jiffies;
b2db7564 3597 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
1da177e4 3598
c15b1cca 3599 cancel_delayed_work(&addr_chk_work);
1da177e4 3600
bcdd553f 3601 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
1da177e4 3602restart:
c15b1cca 3603 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[i], addr_lst) {
1da177e4 3604 unsigned long age;
1da177e4 3605
fad8da3e
YA		 3606 /* When setting preferred_lft to a value not zero or
3607 * infinity, while valid_lft is infinity
3608 * IFA_F_PERMANENT has a non-infinity life time.
3609 */
3610 if ((ifp->flags & IFA_F_PERMANENT) &&
3611 (ifp->prefered_lft == INFINITY_LIFE_TIME))
1da177e4
LT		 3612 continue;
3613
3614 spin_lock(&ifp->lock);
b2db7564
YH		 3615 /* We try to batch several events at once. */
3616 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
1da177e4 3617
8f27ebb9
YH		 3618 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
3619 age >= ifp->valid_lft) {
1da177e4
LT		 3620 spin_unlock(&ifp->lock);
3621 in6_ifa_hold(ifp);
1da177e4
LT		 3622 ipv6_del_addr(ifp);
3623 goto restart;
8f27ebb9
YH		 3624 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
3625 spin_unlock(&ifp->lock);
3626 continue;
1da177e4 3627 } else if (age >= ifp->prefered_lft) {
a1ed0526 3628 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
1da177e4
LT		 3629 int deprecate = 0;
3630
3631 if (!(ifp->flags&IFA_F_DEPRECATED)) {
3632 deprecate = 1;
3633 ifp->flags |= IFA_F_DEPRECATED;
3634 }
3635
fad8da3e
YA		 3636 if ((ifp->valid_lft != INFINITY_LIFE_TIME) &&
3637 (time_before(ifp->tstamp + ifp->valid_lft * HZ, next)))
1da177e4
LT		 3638 next = ifp->tstamp + ifp->valid_lft * HZ;
3639
3640 spin_unlock(&ifp->lock);
3641
3642 if (deprecate) {
3643 in6_ifa_hold(ifp);
1da177e4
LT		 3644
3645 ipv6_ifa_notify(0, ifp);
3646 in6_ifa_put(ifp);
3647 goto restart;
3648 }
1da177e4
LT		 3649 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
3650 !(ifp->flags&IFA_F_TENTATIVE)) {
88949cf4 3651 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
3652 ifp->idev->cnf.dad_transmits *
1f9248e5 3653 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME) / HZ;
88949cf4 3654
1da177e4
LT		 3655 if (age >= ifp->prefered_lft - regen_advance) {
3656 struct inet6_ifaddr *ifpub = ifp->ifpub;
3657 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3658 next = ifp->tstamp + ifp->prefered_lft * HZ;
3659 if (!ifp->regen_count && ifpub) {
3660 ifp->regen_count++;
3661 in6_ifa_hold(ifp);
3662 in6_ifa_hold(ifpub);
3663 spin_unlock(&ifp->lock);
5c578aed 3664
291d809b
HY		 3665 spin_lock(&ifpub->lock);
3666 ifpub->regen_count = 0;
3667 spin_unlock(&ifpub->lock);
1da177e4
LT		 3668 ipv6_create_tempaddr(ifpub, ifp);
3669 in6_ifa_put(ifpub);
3670 in6_ifa_put(ifp);
3671 goto restart;
3672 }
3673 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
3674 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
3675 spin_unlock(&ifp->lock);
1da177e4
LT		 3676 } else {
3677 /* ifp->prefered_lft <= ifp->valid_lft */
3678 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3679 next = ifp->tstamp + ifp->prefered_lft * HZ;
3680 spin_unlock(&ifp->lock);
3681 }
3682 }
1da177e4
LT		 3683 }
3684
b2db7564
YH		 3685 next_sec = round_jiffies_up(next);
3686 next_sched = next;
3687
3688 /* If rounded timeout is accurate enough, accept it. */
3689 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
3690 next_sched = next_sec;
3691
3692 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
3693 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
3694 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
3695
ba3542e1 3696 ADBG(KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
3697 now, next, next_sec, next_sched);
c15b1cca 3698 mod_delayed_work(addrconf_wq, &addr_chk_work, next_sched - now);
5c578aed 3699 rcu_read_unlock_bh();
1da177e4
LT		 3700}
3701
c15b1cca
HFS		 3702static void addrconf_verify_work(struct work_struct *w)
3703{
3704 rtnl_lock();
3705 addrconf_verify_rtnl();
3706 rtnl_unlock();
3707}
3708
3709static void addrconf_verify(void)
3710{
3711 mod_delayed_work(addrconf_wq, &addr_chk_work, 0);
3712}
3713
caeaba79
ND		 3714static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local,
3715 struct in6_addr **peer_pfx)
461d8837
TG		 3716{
3717 struct in6_addr *pfx = NULL;
3718
caeaba79
ND		 3719 *peer_pfx = NULL;
3720
461d8837
TG		 3721 if (addr)
3722 pfx = nla_data(addr);
3723
3724 if (local) {
3725 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
caeaba79
ND		 3726 *peer_pfx = pfx;
3727 pfx = nla_data(local);
461d8837
TG		 3728 }
3729
3730 return pfx;
3731}
3732
ef7c79ed 3733static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
461d8837
TG		 3734 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
3735 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
3736 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
479840ff 3737 [IFA_FLAGS] = { .len = sizeof(u32) },
461d8837
TG		 3738};
3739
1da177e4 3740static int
661d2967 3741inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh)
1da177e4 3742{
3b1e0a65 3743 struct net *net = sock_net(skb->sk);
b933f716
TG		 3744 struct ifaddrmsg *ifm;
3745 struct nlattr *tb[IFA_MAX+1];
caeaba79 3746 struct in6_addr *pfx, *peer_pfx;
6046d5b4 3747 u32 ifa_flags;
b933f716 3748 int err;
1da177e4 3749
b933f716
TG		 3750 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3751 if (err < 0)
3752 return err;
3753
3754 ifm = nlmsg_data(nlh);
caeaba79 3755 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
1da177e4
LT		 3756 if (pfx == NULL)
3757 return -EINVAL;
3758
6046d5b4
HK		 3759 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
3760
3761 /* We ignore other flags so far. */
3762 ifa_flags &= IFA_F_MANAGETEMPADDR;
3763
3764 return inet6_addr_del(net, ifm->ifa_index, ifa_flags, pfx,
3765 ifm->ifa_prefixlen);
1da177e4
LT		 3766}
3767
479840ff 3768static int inet6_addr_modify(struct inet6_ifaddr *ifp, u32 ifa_flags,
55ebaef1 3769 u32 prefered_lft, u32 valid_lft)
081bba5b 3770{
6f704992
YH		 3771 u32 flags;
3772 clock_t expires;
4bed72e4 3773 unsigned long timeout;
53bd6749 3774 bool was_managetempaddr;
5b84efec 3775 bool had_prefixroute;
46d48046 3776
c15b1cca
HFS		 3777 ASSERT_RTNL();
3778
081bba5b
NT		 3779 if (!valid_lft || (prefered_lft > valid_lft))
3780 return -EINVAL;
3781
53bd6749
JP		 3782 if (ifa_flags & IFA_F_MANAGETEMPADDR &&
3783 (ifp->flags & IFA_F_TEMPORARY || ifp->prefix_len != 64))
3784 return -EINVAL;
3785
4bed72e4
YH		 3786 timeout = addrconf_timeout_fixup(valid_lft, HZ);
3787 if (addrconf_finite_timeout(timeout)) {
3788 expires = jiffies_to_clock_t(timeout * HZ);
3789 valid_lft = timeout;
6f704992 3790 flags = RTF_EXPIRES;
4bed72e4
YH		 3791 } else {
3792 expires = 0;
3793 flags = 0;
3794 ifa_flags |= IFA_F_PERMANENT;
6f704992 3795 }
081bba5b 3796
4bed72e4
YH		 3797 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
3798 if (addrconf_finite_timeout(timeout)) {
3799 if (timeout == 0)
3800 ifa_flags |= IFA_F_DEPRECATED;
3801 prefered_lft = timeout;
3802 }
081bba5b
NT		 3803
3804 spin_lock_bh(&ifp->lock);
53bd6749 3805 was_managetempaddr = ifp->flags & IFA_F_MANAGETEMPADDR;
5b84efec
TH		 3806 had_prefixroute = ifp->flags & IFA_F_PERMANENT &&
3807 !(ifp->flags & IFA_F_NOPREFIXROUTE);
53bd6749 3808 ifp->flags &= ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD |
761aac73
TH		 3809 IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
3810 IFA_F_NOPREFIXROUTE);
53bd6749 3811 ifp->flags |= ifa_flags;
081bba5b
NT		 3812 ifp->tstamp = jiffies;
3813 ifp->valid_lft = valid_lft;
3814 ifp->prefered_lft = prefered_lft;
3815
3816 spin_unlock_bh(&ifp->lock);
3817 if (!(ifp->flags&IFA_F_TENTATIVE))
3818 ipv6_ifa_notify(0, ifp);
081bba5b 3819
761aac73
TH		 3820 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) {
3821 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
3822 expires, flags);
5b84efec
TH		 3823 } else if (had_prefixroute) {
3824 enum cleanup_prefix_rt_t action;
3825 unsigned long rt_expires;
3826
3827 write_lock_bh(&ifp->idev->lock);
3828 action = check_cleanup_prefix_route(ifp, &rt_expires);
3829 write_unlock_bh(&ifp->idev->lock);
3830
3831 if (action != CLEANUP_PREFIX_RT_NOP) {
3832 cleanup_prefix_route(ifp, rt_expires,
3833 action == CLEANUP_PREFIX_RT_DEL);
3834 }
761aac73 3835 }
53bd6749
JP		 3836
3837 if (was_managetempaddr || ifp->flags & IFA_F_MANAGETEMPADDR) {
3838 if (was_managetempaddr && !(ifp->flags & IFA_F_MANAGETEMPADDR))
3839 valid_lft = prefered_lft = 0;
3840 manage_tempaddrs(ifp->idev, ifp, valid_lft, prefered_lft,
3841 !was_managetempaddr, jiffies);
3842 }
3843
c15b1cca 3844 addrconf_verify_rtnl();
081bba5b
NT		 3845
3846 return 0;
3847}
3848
1da177e4 3849static int
661d2967 3850inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh)
1da177e4 3851{
3b1e0a65 3852 struct net *net = sock_net(skb->sk);
461d8837
TG		 3853 struct ifaddrmsg *ifm;
3854 struct nlattr *tb[IFA_MAX+1];
caeaba79 3855 struct in6_addr *pfx, *peer_pfx;
7198f8ce
TG		 3856 struct inet6_ifaddr *ifa;
3857 struct net_device *dev;
55ebaef1 3858 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
479840ff 3859 u32 ifa_flags;
461d8837 3860 int err;
1da177e4 3861
461d8837
TG		 3862 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3863 if (err < 0)
3864 return err;
3865
3866 ifm = nlmsg_data(nlh);
caeaba79 3867 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
1da177e4
LT		 3868 if (pfx == NULL)
3869 return -EINVAL;
3870
461d8837 3871 if (tb[IFA_CACHEINFO]) {
0778769d 3872 struct ifa_cacheinfo *ci;
461d8837
TG		 3873
3874 ci = nla_data(tb[IFA_CACHEINFO]);
0778769d 3875 valid_lft = ci->ifa_valid;
461d8837
TG		 3876 preferred_lft = ci->ifa_prefered;
3877 } else {
3878 preferred_lft = INFINITY_LIFE_TIME;
3879 valid_lft = INFINITY_LIFE_TIME;
0778769d
NT		 3880 }
3881
af284937 3882 dev = __dev_get_by_index(net, ifm->ifa_index);
7198f8ce
TG		 3883 if (dev == NULL)
3884 return -ENODEV;
3885
479840ff
JP		 3886 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
3887
55ebaef1 3888 /* We ignore other flags so far. */
761aac73
TH		 3889 ifa_flags &= IFA_F_NODAD | IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
3890 IFA_F_NOPREFIXROUTE;
55ebaef1 3891
1cab3da6 3892 ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
7198f8ce
TG		 3893 if (ifa == NULL) {
3894 /*
3895 * It would be best to check for !NLM_F_CREATE here but
db9c7c39 3896 * userspace already relies on not having to provide this.
7198f8ce 3897 */
caeaba79 3898 return inet6_addr_add(net, ifm->ifa_index, pfx, peer_pfx,
af284937
DL		 3899 ifm->ifa_prefixlen, ifa_flags,
3900 preferred_lft, valid_lft);
081bba5b
NT		 3901 }
3902
7198f8ce
TG		 3903 if (nlh->nlmsg_flags & NLM_F_EXCL ||
3904 !(nlh->nlmsg_flags & NLM_F_REPLACE))
3905 err = -EEXIST;
3906 else
55ebaef1 3907 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
7198f8ce
TG		 3908
3909 in6_ifa_put(ifa);
3910
3911 return err;
1da177e4
LT		 3912}
3913
479840ff 3914static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u32 flags,
101bb229
TG		 3915 u8 scope, int ifindex)
3916{
3917 struct ifaddrmsg *ifm;
3918
3919 ifm = nlmsg_data(nlh);
3920 ifm->ifa_family = AF_INET6;
3921 ifm->ifa_prefixlen = prefixlen;
3922 ifm->ifa_flags = flags;
3923 ifm->ifa_scope = scope;
3924 ifm->ifa_index = ifindex;
3925}
3926
85486af0
TG		 3927static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
3928 unsigned long tstamp, u32 preferred, u32 valid)
3929{
3930 struct ifa_cacheinfo ci;
3931
18a31e1e
TG		 3932 ci.cstamp = cstamp_delta(cstamp);
3933 ci.tstamp = cstamp_delta(tstamp);
85486af0
TG		 3934 ci.ifa_prefered = preferred;
3935 ci.ifa_valid = valid;
3936
3937 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
3938}
3939
101bb229
TG		 3940static inline int rt_scope(int ifa_scope)
3941{
3942 if (ifa_scope & IFA_HOST)
3943 return RT_SCOPE_HOST;
3944 else if (ifa_scope & IFA_LINK)
3945 return RT_SCOPE_LINK;
3946 else if (ifa_scope & IFA_SITE)
3947 return RT_SCOPE_SITE;
3948 else
3949 return RT_SCOPE_UNIVERSE;
3950}
3951
0ab6803b
TG		 3952static inline int inet6_ifaddr_msgsize(void)
3953{
339bf98f 3954 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
caeaba79 3955 + nla_total_size(16) /* IFA_LOCAL */
339bf98f 3956 + nla_total_size(16) /* IFA_ADDRESS */
479840ff
JP		 3957 + nla_total_size(sizeof(struct ifa_cacheinfo))
3958 + nla_total_size(4) /* IFA_FLAGS */;
0ab6803b 3959}
c5396a31 3960
1da177e4 3961static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
15e47304 3962 u32 portid, u32 seq, int event, unsigned int flags)
1da177e4 3963{
1da177e4 3964 struct nlmsghdr *nlh;
85486af0 3965 u32 preferred, valid;
1da177e4 3966
15e47304 3967 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
0ab6803b 3968 if (nlh == NULL)
26932566 3969 return -EMSGSIZE;
0ab6803b 3970
101bb229
TG		 3971 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
3972 ifa->idev->dev->ifindex);
3973
fad8da3e
YA		 3974 if (!((ifa->flags&IFA_F_PERMANENT) &&
3975 (ifa->prefered_lft == INFINITY_LIFE_TIME))) {
85486af0
TG		 3976 preferred = ifa->prefered_lft;
3977 valid = ifa->valid_lft;
3978 if (preferred != INFINITY_LIFE_TIME) {
1da177e4 3979 long tval = (jiffies - ifa->tstamp)/HZ;
a1faa698
JR		 3980 if (preferred > tval)
3981 preferred -= tval;
3982 else
3983 preferred = 0;
f56619fc
BH		 3984 if (valid != INFINITY_LIFE_TIME) {
3985 if (valid > tval)
3986 valid -= tval;
3987 else
3988 valid = 0;
3989 }
1da177e4
LT		 3990 }
3991 } else {
85486af0
TG		 3992 preferred = INFINITY_LIFE_TIME;
3993 valid = INFINITY_LIFE_TIME;
3994 }
3995
7996c799 3996 if (!ipv6_addr_any(&ifa->peer_addr)) {
caeaba79
ND		 3997 if (nla_put(skb, IFA_LOCAL, 16, &ifa->addr) < 0 ||
3998 nla_put(skb, IFA_ADDRESS, 16, &ifa->peer_addr) < 0)
3999 goto error;
4000 } else
4001 if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0)
4002 goto error;
4003
4004 if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0)
4005 goto error;
1da177e4 4006
479840ff
JP		 4007 if (nla_put_u32(skb, IFA_FLAGS, ifa->flags) < 0)
4008 goto error;
4009
0ab6803b 4010 return nlmsg_end(skb, nlh);
caeaba79
ND		 4011
4012error:
4013 nlmsg_cancel(skb, nlh);
4014 return -EMSGSIZE;
1da177e4
LT		 4015}
4016
4017static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
15e47304 4018 u32 portid, u32 seq, int event, u16 flags)
1da177e4 4019{
1da177e4 4020 struct nlmsghdr *nlh;
101bb229
TG		 4021 u8 scope = RT_SCOPE_UNIVERSE;
4022 int ifindex = ifmca->idev->dev->ifindex;
4023
4024 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
4025 scope = RT_SCOPE_SITE;
1da177e4 4026
15e47304 4027 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
0ab6803b 4028 if (nlh == NULL)
26932566 4029 return -EMSGSIZE;
85486af0 4030
0ab6803b
TG		 4031 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
4032 if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 ||
4033 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
26932566
PM		 4034 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
4035 nlmsg_cancel(skb, nlh);
4036 return -EMSGSIZE;
4037 }
85486af0 4038
0ab6803b 4039 return nlmsg_end(skb, nlh);
1da177e4
LT		 4040}
4041
4042static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
15e47304 4043 u32 portid, u32 seq, int event, unsigned int flags)
1da177e4 4044{
1da177e4 4045 struct nlmsghdr *nlh;
101bb229
TG		 4046 u8 scope = RT_SCOPE_UNIVERSE;
4047 int ifindex = ifaca->aca_idev->dev->ifindex;
4048
4049 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
4050 scope = RT_SCOPE_SITE;
1da177e4 4051
15e47304 4052 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
0ab6803b 4053 if (nlh == NULL)
26932566 4054 return -EMSGSIZE;
85486af0 4055
0ab6803b
TG		 4056 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
4057 if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 ||
4058 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
26932566
PM		 4059 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
4060 nlmsg_cancel(skb, nlh);
4061 return -EMSGSIZE;
4062 }
1da177e4 4063
0ab6803b 4064 return nlmsg_end(skb, nlh);
1da177e4
LT		 4065}
4066
e21e8467 4067enum addr_type_t {
1da177e4
LT		 4068 UNICAST_ADDR,
4069 MULTICAST_ADDR,
4070 ANYCAST_ADDR,
4071};
4072
234b27c3
ED		 4073/* called with rcu_read_lock() */
4074static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
4075 struct netlink_callback *cb, enum addr_type_t type,
4076 int s_ip_idx, int *p_ip_idx)
4077{
234b27c3
ED		 4078 struct ifmcaddr6 *ifmca;
4079 struct ifacaddr6 *ifaca;
4080 int err = 1;
4081 int ip_idx = *p_ip_idx;
4082
4083 read_lock_bh(&idev->lock);
4084 switch (type) {
502a2ffd 4085 case UNICAST_ADDR: {
4086 struct inet6_ifaddr *ifa;
4087
234b27c3 4088 /* unicast address incl. temp addr */
502a2ffd 4089 list_for_each_entry(ifa, &idev->addr_list, if_list) {
4090 if (++ip_idx < s_ip_idx)
234b27c3
ED		 4091 continue;
4092 err = inet6_fill_ifaddr(skb, ifa,
15e47304 4093 NETLINK_CB(cb->skb).portid,
234b27c3
ED		 4094 cb->nlh->nlmsg_seq,
4095 RTM_NEWADDR,
4096 NLM_F_MULTI);
4097 if (err <= 0)
4098 break;
63998ac2 4099 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
234b27c3
ED		 4100 }
4101 break;
502a2ffd 4102 }
234b27c3
ED		 4103 case MULTICAST_ADDR:
4104 /* multicast address */
4105 for (ifmca = idev->mc_list; ifmca;
4106 ifmca = ifmca->next, ip_idx++) {
4107 if (ip_idx < s_ip_idx)
4108 continue;
4109 err = inet6_fill_ifmcaddr(skb, ifmca,
15e47304 4110 NETLINK_CB(cb->skb).portid,
234b27c3
ED		 4111 cb->nlh->nlmsg_seq,
4112 RTM_GETMULTICAST,
4113 NLM_F_MULTI);
4114 if (err <= 0)
4115 break;
4116 }
4117 break;
4118 case ANYCAST_ADDR:
4119 /* anycast address */
4120 for (ifaca = idev->ac_list; ifaca;
4121 ifaca = ifaca->aca_next, ip_idx++) {
4122 if (ip_idx < s_ip_idx)
4123 continue;
4124 err = inet6_fill_ifacaddr(skb, ifaca,
15e47304 4125 NETLINK_CB(cb->skb).portid,
234b27c3
ED		 4126 cb->nlh->nlmsg_seq,
4127 RTM_GETANYCAST,
4128 NLM_F_MULTI);
4129 if (err <= 0)
4130 break;
4131 }
4132 break;
4133 default:
4134 break;
4135 }
4136 read_unlock_bh(&idev->lock);
4137 *p_ip_idx = ip_idx;
4138 return err;
4139}
4140
1da177e4
LT		 4141static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
4142 enum addr_type_t type)
4143{
234b27c3
ED		 4144 struct net *net = sock_net(skb->sk);
4145 int h, s_h;
1da177e4
LT		 4146 int idx, ip_idx;
4147 int s_idx, s_ip_idx;
1da177e4 4148 struct net_device *dev;
234b27c3
ED		 4149 struct inet6_dev *idev;
4150 struct hlist_head *head;
1ab1457c 4151
234b27c3
ED		 4152 s_h = cb->args[0];
4153 s_idx = idx = cb->args[1];
4154 s_ip_idx = ip_idx = cb->args[2];
5d5619b4 4155
234b27c3 4156 rcu_read_lock();
63998ac2 4157 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ net->dev_base_seq;
234b27c3
ED		 4158 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4159 idx = 0;
4160 head = &net->dev_index_head[h];
b67bfe0d 4161 hlist_for_each_entry_rcu(dev, head, index_hlist) {
234b27c3
ED		 4162 if (idx < s_idx)
4163 goto cont;
4b97efdf 4164 if (h > s_h || idx > s_idx)
234b27c3
ED		 4165 s_ip_idx = 0;
4166 ip_idx = 0;
e21e8467
SH		 4167 idev = __in6_dev_get(dev);
4168 if (!idev)
234b27c3
ED		 4169 goto cont;
4170
4171 if (in6_dump_addrs(idev, skb, cb, type,
4172 s_ip_idx, &ip_idx) <= 0)
4173 goto done;
7562f876 4174cont:
234b27c3
ED		 4175 idx++;
4176 }
1da177e4 4177 }
234b27c3
ED		 4178done:
4179 rcu_read_unlock();
4180 cb->args[0] = h;
4181 cb->args[1] = idx;
4182 cb->args[2] = ip_idx;
4183
1da177e4
LT		 4184 return skb->len;
4185}
4186
4187static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
4188{
4189 enum addr_type_t type = UNICAST_ADDR;
b854272b 4190
1da177e4
LT		 4191 return inet6_dump_addr(skb, cb, type);
4192}
4193
4194static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
4195{
4196 enum addr_type_t type = MULTICAST_ADDR;
b854272b 4197
1da177e4
LT		 4198 return inet6_dump_addr(skb, cb, type);
4199}
4200
4201
4202static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
4203{
4204 enum addr_type_t type = ANYCAST_ADDR;
b854272b 4205
1da177e4
LT		 4206 return inet6_dump_addr(skb, cb, type);
4207}
4208
661d2967 4209static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh)
6c223828 4210{
3b1e0a65 4211 struct net *net = sock_net(in_skb->sk);
1b29fc2c
TG		 4212 struct ifaddrmsg *ifm;
4213 struct nlattr *tb[IFA_MAX+1];
caeaba79 4214 struct in6_addr *addr = NULL, *peer;
6c223828
NT		 4215 struct net_device *dev = NULL;
4216 struct inet6_ifaddr *ifa;
4217 struct sk_buff *skb;
6c223828
NT		 4218 int err;
4219
1b29fc2c
TG		 4220 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
4221 if (err < 0)
4222 goto errout;
4223
caeaba79 4224 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer);
1b29fc2c
TG		 4225 if (addr == NULL) {
4226 err = -EINVAL;
4227 goto errout;
6c223828 4228 }
6c223828 4229
1b29fc2c 4230 ifm = nlmsg_data(nlh);
6c223828 4231 if (ifm->ifa_index)
6fda7350 4232 dev = __dev_get_by_index(net, ifm->ifa_index);
6c223828 4233
e21e8467
SH		 4234 ifa = ipv6_get_ifaddr(net, addr, dev, 1);
4235 if (!ifa) {
1b29fc2c
TG		 4236 err = -EADDRNOTAVAIL;
4237 goto errout;
4238 }
6c223828 4239
e21e8467
SH		 4240 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
4241 if (!skb) {
6c223828 4242 err = -ENOBUFS;
1b29fc2c 4243 goto errout_ifa;
6c223828
NT		 4244 }
4245
15e47304 4246 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).portid,
6c223828 4247 nlh->nlmsg_seq, RTM_NEWADDR, 0);
26932566
PM		 4248 if (err < 0) {
4249 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4250 WARN_ON(err == -EMSGSIZE);
4251 kfree_skb(skb);
4252 goto errout_ifa;
4253 }
15e47304 4254 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
1b29fc2c 4255errout_ifa:
6c223828 4256 in6_ifa_put(ifa);
1b29fc2c 4257errout:
6c223828 4258 return err;
6c223828
NT		 4259}
4260
1da177e4
LT		 4261static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
4262{
4263 struct sk_buff *skb;
c346dca1 4264 struct net *net = dev_net(ifa->idev->dev);
5d620266 4265 int err = -ENOBUFS;
1da177e4 4266
0ab6803b 4267 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
5d620266
TG		 4268 if (skb == NULL)
4269 goto errout;
4270
4271 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
26932566
PM		 4272 if (err < 0) {
4273 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4274 WARN_ON(err == -EMSGSIZE);
4275 kfree_skb(skb);
4276 goto errout;
4277 }
1ce85fe4
PNA		 4278 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
4279 return;
5d620266
TG		 4280errout:
4281 if (err < 0)
6fda7350 4282 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
1da177e4
LT		 4283}
4284
b6f99a21 4285static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
1da177e4
LT		 4286 __s32 *array, int bytes)
4287{
04561c1f
TG		 4288 BUG_ON(bytes < (DEVCONF_MAX * 4));
4289
1da177e4
LT		 4290 memset(array, 0, bytes);
4291 array[DEVCONF_FORWARDING] = cnf->forwarding;
4292 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
4293 array[DEVCONF_MTU6] = cnf->mtu6;
4294 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
4295 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
4296 array[DEVCONF_AUTOCONF] = cnf->autoconf;
4297 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
4298 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
93908d19
TG		 4299 array[DEVCONF_RTR_SOLICIT_INTERVAL] =
4300 jiffies_to_msecs(cnf->rtr_solicit_interval);
4301 array[DEVCONF_RTR_SOLICIT_DELAY] =
4302 jiffies_to_msecs(cnf->rtr_solicit_delay);
1da177e4 4303 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
fc4eba58
HFS		 4304 array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] =
4305 jiffies_to_msecs(cnf->mldv1_unsolicited_report_interval);
4306 array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] =
4307 jiffies_to_msecs(cnf->mldv2_unsolicited_report_interval);
1da177e4
LT		 4308 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
4309 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
4310 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
4311 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
4312 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
1da177e4 4313 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
65f5c7c1 4314 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
c4fd30eb 4315 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
930d6ff2
YH		 4316#ifdef CONFIG_IPV6_ROUTER_PREF
4317 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
93908d19
TG		 4318 array[DEVCONF_RTR_PROBE_INTERVAL] =
4319 jiffies_to_msecs(cnf->rtr_probe_interval);
fa03ef38 4320#ifdef CONFIG_IPV6_ROUTE_INFO
09c884d4
YH		 4321 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
4322#endif
930d6ff2 4323#endif
fbea49e1 4324 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
0bcbc926 4325 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
95c385b4
NH		 4326#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4327 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
4328#endif
7bc570c8
YH		 4329#ifdef CONFIG_IPV6_MROUTE
4330 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
4331#endif
778d80be 4332 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
1b34be74 4333 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
c3faca05 4334 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
5cb04436 4335 array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify;
b800c3b9 4336 array[DEVCONF_SUPPRESS_FRAG_NDISC] = cnf->suppress_frag_ndisc;
d9333196 4337 array[DEVCONF_ACCEPT_RA_FROM_LOCAL] = cnf->accept_ra_from_local;
1da177e4
LT		 4338}
4339
b382b191
TG		 4340static inline size_t inet6_ifla6_size(void)
4341{
4342 return nla_total_size(4) /* IFLA_INET6_FLAGS */
4343 + nla_total_size(sizeof(struct ifla_cacheinfo))
4344 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
4345 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
f53adae4
DB		 4346 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
4347 + nla_total_size(sizeof(struct in6_addr)); /* IFLA_INET6_TOKEN */
b382b191
TG		 4348}
4349
339bf98f
TG		 4350static inline size_t inet6_if_nlmsg_size(void)
4351{
4352 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
4353 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
4354 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
4355 + nla_total_size(4) /* IFLA_MTU */
4356 + nla_total_size(4) /* IFLA_LINK */
b382b191 4357 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */
339bf98f 4358}
c5396a31 4359
be281e55 4360static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib,
7d720c3e 4361 int items, int bytes)
7f7d9a6b
HX		 4362{
4363 int i;
4364 int pad = bytes - sizeof(u64) * items;
4365 BUG_ON(pad < 0);
4366
4367 /* Use put_unaligned() because stats may not be aligned for u64. */
4368 put_unaligned(items, &stats[0]);
4369 for (i = 1; i < items; i++)
be281e55 4370 put_unaligned(atomic_long_read(&mib[i]), &stats[i]);
7f7d9a6b
HX		 4371
4372 memset(&stats[items], 0, pad);
4373}
4374
698365fa 4375static inline void __snmp6_fill_stats64(u64 *stats, void __percpu *mib,
4ce3c183
ED		 4376 int items, int bytes, size_t syncpoff)
4377{
4378 int i;
4379 int pad = bytes - sizeof(u64) * items;
4380 BUG_ON(pad < 0);
4381
4382 /* Use put_unaligned() because stats may not be aligned for u64. */
4383 put_unaligned(items, &stats[0]);
4384 for (i = 1; i < items; i++)
4385 put_unaligned(snmp_fold_field64(mib, i, syncpoff), &stats[i]);
4386
4387 memset(&stats[items], 0, pad);
4388}
4389
7f7d9a6b
HX		 4390static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
4391 int bytes)
4392{
e21e8467 4393 switch (attrtype) {
7f7d9a6b 4394 case IFLA_INET6_STATS:
698365fa 4395 __snmp6_fill_stats64(stats, idev->stats.ipv6,
4ce3c183 4396 IPSTATS_MIB_MAX, bytes, offsetof(struct ipstats_mib, syncp));
7f7d9a6b
HX		 4397 break;
4398 case IFLA_INET6_ICMP6STATS:
be281e55 4399 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, ICMP6_MIB_MAX, bytes);
7f7d9a6b
HX		 4400 break;
4401 }
4402}
4403
b382b191
TG		 4404static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev)
4405{
4406 struct nlattr *nla;
4407 struct ifla_cacheinfo ci;
4408
c78679e8
DM		 4409 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags))
4410 goto nla_put_failure;
b382b191 4411 ci.max_reasm_len = IPV6_MAXPLEN;
24912420
DM		 4412 ci.tstamp = cstamp_delta(idev->tstamp);
4413 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time);
1f9248e5 4414 ci.retrans_time = jiffies_to_msecs(NEIGH_VAR(idev->nd_parms, RETRANS_TIME));
c78679e8
DM		 4415 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci))
4416 goto nla_put_failure;
b382b191
TG		 4417 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
4418 if (nla == NULL)
4419 goto nla_put_failure;
4420 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
4421
4422 /* XXX - MC not implemented */
4423
4424 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
4425 if (nla == NULL)
4426 goto nla_put_failure;
4427 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
4428
4429 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
4430 if (nla == NULL)
4431 goto nla_put_failure;
4432 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
4433
f53adae4
DB		 4434 nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr));
4435 if (nla == NULL)
4436 goto nla_put_failure;
bc91b0f0
JP		 4437
4438 if (nla_put_u8(skb, IFLA_INET6_ADDR_GEN_MODE, idev->addr_gen_mode))
4439 goto nla_put_failure;
4440
f53adae4
DB		 4441 read_lock_bh(&idev->lock);
4442 memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla));
4443 read_unlock_bh(&idev->lock);
4444
b382b191
TG		 4445 return 0;
4446
4447nla_put_failure:
4448 return -EMSGSIZE;
4449}
4450
4451static size_t inet6_get_link_af_size(const struct net_device *dev)
4452{
4453 if (!__in6_dev_get(dev))
4454 return 0;
4455
4456 return inet6_ifla6_size();
4457}
4458
4459static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev)
4460{
4461 struct inet6_dev *idev = __in6_dev_get(dev);
4462
4463 if (!idev)
4464 return -ENODATA;
4465
4466 if (inet6_fill_ifla6_attrs(skb, idev) < 0)
4467 return -EMSGSIZE;
4468
4469 return 0;
4470}
4471
f53adae4
DB		 4472static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token)
4473{
f53adae4
DB		 4474 struct inet6_ifaddr *ifp;
4475 struct net_device *dev = idev->dev;
fc403832 4476 bool update_rs = false;
dc848292 4477 struct in6_addr ll_addr;
f53adae4 4478
c15b1cca
HFS		 4479 ASSERT_RTNL();
4480
f53adae4
DB		 4481 if (token == NULL)
4482 return -EINVAL;
4483 if (ipv6_addr_any(token))
4484 return -EINVAL;
4485 if (dev->flags & (IFF_LOOPBACK | IFF_NOARP))
4486 return -EINVAL;
f53adae4
DB		 4487 if (!ipv6_accept_ra(idev))
4488 return -EINVAL;
4489 if (idev->cnf.rtr_solicits <= 0)
4490 return -EINVAL;
4491
4492 write_lock_bh(&idev->lock);
4493
4494 BUILD_BUG_ON(sizeof(token->s6_addr) != 16);
4495 memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8);
4496
4497 write_unlock_bh(&idev->lock);
4498
dc848292
HFS		 4499 if (!idev->dead && (idev->if_flags & IF_READY) &&
4500 !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE |
4501 IFA_F_OPTIMISTIC)) {
fc403832
DB		 4502
4503 /* If we're not ready, then normal ifup will take care
4504 * of this. Otherwise, we need to request our rs here.
4505 */
4506 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters);
4507 update_rs = true;
4508 }
f53adae4
DB		 4509
4510 write_lock_bh(&idev->lock);
fc403832 4511
77ecaace 4512 if (update_rs) {
fc403832 4513 idev->if_flags |= IF_RS_SENT;
77ecaace
HFS		 4514 idev->rs_probes = 1;
4515 addrconf_mod_rs_timer(idev, idev->cnf.rtr_solicit_interval);
4516 }
f53adae4
DB		 4517
4518 /* Well, that's kinda nasty ... */
4519 list_for_each_entry(ifp, &idev->addr_list, if_list) {
4520 spin_lock(&ifp->lock);
617fe29d 4521 if (ifp->tokenized) {
f53adae4
DB		 4522 ifp->valid_lft = 0;
4523 ifp->prefered_lft = 0;
4524 }
4525 spin_unlock(&ifp->lock);
4526 }
4527
4528 write_unlock_bh(&idev->lock);
c15b1cca 4529 addrconf_verify_rtnl();
f53adae4
DB		 4530 return 0;
4531}
4532
4533static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla)
4534{
4535 int err = -EINVAL;
4536 struct inet6_dev *idev = __in6_dev_get(dev);
4537 struct nlattr *tb[IFLA_INET6_MAX + 1];
4538
4539 if (!idev)
4540 return -EAFNOSUPPORT;
4541
4542 if (nla_parse_nested(tb, IFLA_INET6_MAX, nla, NULL) < 0)
4543 BUG();
4544
bc91b0f0 4545 if (tb[IFLA_INET6_TOKEN]) {
f53adae4 4546 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN]));
bc91b0f0
JP		 4547 if (err)
4548 return err;
4549 }
4550
4551 if (tb[IFLA_INET6_ADDR_GEN_MODE]) {
4552 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]);
4553
4554 if (mode != IN6_ADDR_GEN_MODE_EUI64 &&
4555 mode != IN6_ADDR_GEN_MODE_NONE)
4556 return -EINVAL;
4557 idev->addr_gen_mode = mode;
4558 err = 0;
4559 }
f53adae4
DB		 4560
4561 return err;
4562}
4563
1ab1457c 4564static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
15e47304 4565 u32 portid, u32 seq, int event, unsigned int flags)
1da177e4 4566{
04561c1f 4567 struct net_device *dev = idev->dev;
04561c1f
TG		 4568 struct ifinfomsg *hdr;
4569 struct nlmsghdr *nlh;
4570 void *protoinfo;
04561c1f 4571
15e47304 4572 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags);
04561c1f 4573 if (nlh == NULL)
26932566 4574 return -EMSGSIZE;
04561c1f
TG		 4575
4576 hdr = nlmsg_data(nlh);
4577 hdr->ifi_family = AF_INET6;
4578 hdr->__ifi_pad = 0;
4579 hdr->ifi_type = dev->type;
4580 hdr->ifi_index = dev->ifindex;
4581 hdr->ifi_flags = dev_get_flags(dev);
4582 hdr->ifi_change = 0;
4583
c78679e8
DM		 4584 if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
4585 (dev->addr_len &&
4586 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
4587 nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
4588 (dev->ifindex != dev->iflink &&
4589 nla_put_u32(skb, IFLA_LINK, dev->iflink)))
4590 goto nla_put_failure;
04561c1f
TG		 4591 protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
4592 if (protoinfo == NULL)
4593 goto nla_put_failure;
1da177e4 4594
b382b191 4595 if (inet6_fill_ifla6_attrs(skb, idev) < 0)
bf99f1bd 4596 goto nla_put_failure;
1da177e4 4597
04561c1f
TG		 4598 nla_nest_end(skb, protoinfo);
4599 return nlmsg_end(skb, nlh);
1da177e4 4600
04561c1f 4601nla_put_failure:
26932566
PM		 4602 nlmsg_cancel(skb, nlh);
4603 return -EMSGSIZE;
1da177e4
LT		 4604}
4605
4606static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
4607{
3b1e0a65 4608 struct net *net = sock_net(skb->sk);
84d2697d 4609 int h, s_h;
434a8a58 4610 int idx = 0, s_idx;
1da177e4
LT		 4611 struct net_device *dev;
4612 struct inet6_dev *idev;
84d2697d 4613 struct hlist_head *head;
1da177e4 4614
84d2697d
ED		 4615 s_h = cb->args[0];
4616 s_idx = cb->args[1];
4617
4618 rcu_read_lock();
4619 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4620 idx = 0;
4621 head = &net->dev_index_head[h];
b67bfe0d 4622 hlist_for_each_entry_rcu(dev, head, index_hlist) {
84d2697d
ED		 4623 if (idx < s_idx)
4624 goto cont;
4625 idev = __in6_dev_get(dev);
4626 if (!idev)
4627 goto cont;
4628 if (inet6_fill_ifinfo(skb, idev,
15e47304 4629 NETLINK_CB(cb->skb).portid,
84d2697d
ED		 4630 cb->nlh->nlmsg_seq,
4631 RTM_NEWLINK, NLM_F_MULTI) <= 0)
4632 goto out;
7562f876 4633cont:
84d2697d
ED		 4634 idx++;
4635 }
1da177e4 4636 }
84d2697d
ED		 4637out:
4638 rcu_read_unlock();
4639 cb->args[1] = idx;
4640 cb->args[0] = h;
1da177e4
LT		 4641
4642 return skb->len;
4643}
4644
4645void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
4646{
4647 struct sk_buff *skb;
c346dca1 4648 struct net *net = dev_net(idev->dev);
8d7a76c9 4649 int err = -ENOBUFS;
1ab1457c 4650
339bf98f 4651 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
8d7a76c9
TG		 4652 if (skb == NULL)
4653 goto errout;
4654
4655 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
26932566
PM		 4656 if (err < 0) {
4657 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
4658 WARN_ON(err == -EMSGSIZE);
4659 kfree_skb(skb);
4660 goto errout;
4661 }
5f75a104 4662 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC);
1ce85fe4 4663 return;
8d7a76c9
TG		 4664errout:
4665 if (err < 0)
5f75a104 4666 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err);
1da177e4
LT		 4667}
4668
339bf98f
TG		 4669static inline size_t inet6_prefix_nlmsg_size(void)
4670{
4671 return NLMSG_ALIGN(sizeof(struct prefixmsg))
4672 + nla_total_size(sizeof(struct in6_addr))
4673 + nla_total_size(sizeof(struct prefix_cacheinfo));
4674}
c5396a31 4675
1da177e4 4676static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
15e47304 4677 struct prefix_info *pinfo, u32 portid, u32 seq,
6051e2f4 4678 int event, unsigned int flags)
1da177e4 4679{
6051e2f4
TG		 4680 struct prefixmsg *pmsg;
4681 struct nlmsghdr *nlh;
1da177e4
LT		 4682 struct prefix_cacheinfo ci;
4683
15e47304 4684 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags);
6051e2f4 4685 if (nlh == NULL)
26932566 4686 return -EMSGSIZE;
6051e2f4
TG		 4687
4688 pmsg = nlmsg_data(nlh);
1da177e4 4689 pmsg->prefix_family = AF_INET6;
8a47077a
PM		 4690 pmsg->prefix_pad1 = 0;
4691 pmsg->prefix_pad2 = 0;
1da177e4
LT		 4692 pmsg->prefix_ifindex = idev->dev->ifindex;
4693 pmsg->prefix_len = pinfo->prefix_len;
4694 pmsg->prefix_type = pinfo->type;
8a47077a 4695 pmsg->prefix_pad3 = 0;
1da177e4
LT		 4696 pmsg->prefix_flags = 0;
4697 if (pinfo->onlink)
4698 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
4699 if (pinfo->autoconf)
4700 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
4701
c78679e8
DM		 4702 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix))
4703 goto nla_put_failure;
1da177e4
LT		 4704 ci.preferred_time = ntohl(pinfo->prefered);
4705 ci.valid_time = ntohl(pinfo->valid);
c78679e8
DM		 4706 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci))
4707 goto nla_put_failure;
6051e2f4 4708 return nlmsg_end(skb, nlh);
1da177e4 4709
6051e2f4 4710nla_put_failure:
26932566
PM		 4711 nlmsg_cancel(skb, nlh);
4712 return -EMSGSIZE;
1da177e4
LT		 4713}
4714
1ab1457c 4715static void inet6_prefix_notify(int event, struct inet6_dev *idev,
1da177e4
LT		 4716 struct prefix_info *pinfo)
4717{
4718 struct sk_buff *skb;
c346dca1 4719 struct net *net = dev_net(idev->dev);
8c384bfa 4720 int err = -ENOBUFS;
1da177e4 4721
339bf98f 4722 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
8c384bfa
TG		 4723 if (skb == NULL)
4724 goto errout;
4725
4726 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
26932566
PM		 4727 if (err < 0) {
4728 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
4729 WARN_ON(err == -EMSGSIZE);
4730 kfree_skb(skb);
4731 goto errout;
4732 }
1ce85fe4
PNA		 4733 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
4734 return;
8c384bfa
TG		 4735errout:
4736 if (err < 0)
6fda7350 4737 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
1da177e4
LT		 4738}
4739
1da177e4
LT		 4740static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4741{
63998ac2
ND		 4742 struct net *net = dev_net(ifp->idev->dev);
4743
c15b1cca
HFS		 4744 if (event)
4745 ASSERT_RTNL();
4746
1da177e4
LT		 4747 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
4748
4749 switch (event) {
4750 case RTM_NEWADDR:
95c385b4
NH		 4751 /*
4752 * If the address was optimistic
4753 * we inserted the route at the start of
4754 * our DAD process, so we don't need
4755 * to do it again
4756 */
4757 if (!(ifp->rt->rt6i_node))
4758 ip6_ins_rt(ifp->rt);
1da177e4
LT		 4759 if (ifp->idev->cnf.forwarding)
4760 addrconf_join_anycast(ifp);
7996c799 4761 if (!ipv6_addr_any(&ifp->peer_addr))
caeaba79
ND		 4762 addrconf_prefix_route(&ifp->peer_addr, 128,
4763 ifp->idev->dev, 0, 0);
1da177e4
LT		 4764 break;
4765 case RTM_DELADDR:
4766 if (ifp->idev->cnf.forwarding)
4767 addrconf_leave_anycast(ifp);
4768 addrconf_leave_solict(ifp->idev, &ifp->addr);
7996c799 4769 if (!ipv6_addr_any(&ifp->peer_addr)) {
caeaba79
ND		 4770 struct rt6_info *rt;
4771 struct net_device *dev = ifp->idev->dev;
4772
4773 rt = rt6_lookup(dev_net(dev), &ifp->peer_addr, NULL,
4774 dev->ifindex, 1);
f24062b0
ND		 4775 if (rt && ip6_del_rt(rt))
4776 dst_free(&rt->dst);
caeaba79 4777 }
d8d1f30b 4778 dst_hold(&ifp->rt->dst);
93fa159a 4779
73a8bd74 4780 if (ip6_del_rt(ifp->rt))
d8d1f30b 4781 dst_free(&ifp->rt->dst);
1da177e4
LT		 4782 break;
4783 }
63998ac2 4784 atomic_inc(&net->ipv6.dev_addr_genid);
439677d7 4785 rt_genid_bump_ipv6(net);
1da177e4
LT		 4786}
4787
4788static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4789{
8814c4b5 4790 rcu_read_lock_bh();
1da177e4
LT		 4791 if (likely(ifp->idev->dead == 0))
4792 __ipv6_ifa_notify(event, ifp);
8814c4b5 4793 rcu_read_unlock_bh();
1da177e4
LT		 4794}
4795
4796#ifdef CONFIG_SYSCTL
4797
4798static
fe2c6338 4799int addrconf_sysctl_forward(struct ctl_table *ctl, int write,
1da177e4
LT		 4800 void __user *buffer, size_t *lenp, loff_t *ppos)
4801{
4802 int *valp = ctl->data;
4803 int val = *valp;
88af182e 4804 loff_t pos = *ppos;
fe2c6338 4805 struct ctl_table lctl;
1da177e4
LT		 4806 int ret;
4807
013d97e9
FR		 4808 /*
4809 * ctl->data points to idev->cnf.forwarding, we should
4810 * not modify it until we get the rtnl lock.
4811 */
4812 lctl = *ctl;
4813 lctl.data = &val;
4814
4815 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
1da177e4 4816
c8fecf22 4817 if (write)
b325fddb 4818 ret = addrconf_fixup_forwarding(ctl, valp, val);
88af182e
EB		 4819 if (ret)
4820 *ppos = pos;
1ab1457c 4821 return ret;
1da177e4
LT		 4822}
4823
56d417b1
BH		 4824static void dev_disable_change(struct inet6_dev *idev)
4825{
75538c2b
CW		 4826 struct netdev_notifier_info info;
4827
56d417b1
BH		 4828 if (!idev || !idev->dev)
4829 return;
4830
75538c2b 4831 netdev_notifier_info_init(&info, idev->dev);
56d417b1 4832 if (idev->cnf.disable_ipv6)
75538c2b 4833 addrconf_notify(NULL, NETDEV_DOWN, &info);
56d417b1 4834 else
75538c2b 4835 addrconf_notify(NULL, NETDEV_UP, &info);
56d417b1
BH		 4836}
4837
4838static void addrconf_disable_change(struct net *net, __s32 newf)
4839{
4840 struct net_device *dev;
4841 struct inet6_dev *idev;
4842
c6d14c84
ED		 4843 rcu_read_lock();
4844 for_each_netdev_rcu(net, dev) {
56d417b1
BH		 4845 idev = __in6_dev_get(dev);
4846 if (idev) {
4847 int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
4848 idev->cnf.disable_ipv6 = newf;
4849 if (changed)
4850 dev_disable_change(idev);
4851 }
56d417b1 4852 }
c6d14c84 4853 rcu_read_unlock();
56d417b1
BH		 4854}
4855
013d97e9 4856static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf)
56d417b1
BH		 4857{
4858 struct net *net;
013d97e9
FR		 4859 int old;
4860
4861 if (!rtnl_trylock())
4862 return restart_syscall();
56d417b1
BH		 4863
4864 net = (struct net *)table->extra2;
013d97e9
FR		 4865 old = *p;
4866 *p = newf;
56d417b1 4867
013d97e9
FR		 4868 if (p == &net->ipv6.devconf_dflt->disable_ipv6) {
4869 rtnl_unlock();
56d417b1 4870 return 0;
88af182e 4871 }
56d417b1
BH		 4872
4873 if (p == &net->ipv6.devconf_all->disable_ipv6) {
56d417b1
BH		 4874 net->ipv6.devconf_dflt->disable_ipv6 = newf;
4875 addrconf_disable_change(net, newf);
013d97e9 4876 } else if ((!newf) ^ (!old))
56d417b1
BH		 4877 dev_disable_change((struct inet6_dev *)table->extra1);
4878
4879 rtnl_unlock();
4880 return 0;
4881}
4882
4883static
fe2c6338 4884int addrconf_sysctl_disable(struct ctl_table *ctl, int write,
56d417b1
BH		 4885 void __user *buffer, size_t *lenp, loff_t *ppos)
4886{
4887 int *valp = ctl->data;
4888 int val = *valp;
88af182e 4889 loff_t pos = *ppos;
fe2c6338 4890 struct ctl_table lctl;
56d417b1
BH		 4891 int ret;
4892
013d97e9
FR		 4893 /*
4894 * ctl->data points to idev->cnf.disable_ipv6, we should
4895 * not modify it until we get the rtnl lock.
4896 */
4897 lctl = *ctl;
4898 lctl.data = &val;
4899
4900 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
56d417b1
BH		 4901
4902 if (write)
4903 ret = addrconf_disable_ipv6(ctl, valp, val);
88af182e
EB		 4904 if (ret)
4905 *ppos = pos;
56d417b1
BH		 4906 return ret;
4907}
4908
c92d5491 4909static
4910int addrconf_sysctl_proxy_ndp(struct ctl_table *ctl, int write,
4911 void __user *buffer, size_t *lenp, loff_t *ppos)
4912{
4913 int *valp = ctl->data;
4914 int ret;
4915 int old, new;
4916
4917 old = *valp;
4918 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
4919 new = *valp;
4920
4921 if (write && old != new) {
4922 struct net *net = ctl->extra2;
4923
4924 if (!rtnl_trylock())
4925 return restart_syscall();
4926
4927 if (valp == &net->ipv6.devconf_dflt->proxy_ndp)
4928 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
4929 NETCONFA_IFINDEX_DEFAULT,
4930 net->ipv6.devconf_dflt);
4931 else if (valp == &net->ipv6.devconf_all->proxy_ndp)
4932 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
4933 NETCONFA_IFINDEX_ALL,
4934 net->ipv6.devconf_all);
4935 else {
4936 struct inet6_dev *idev = ctl->extra1;
4937
4938 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
4939 idev->dev->ifindex,
4940 &idev->cnf);
4941 }
4942 rtnl_unlock();
4943 }
4944
4945 return ret;
4946}
4947
4948
1da177e4
LT		 4949static struct addrconf_sysctl_table
4950{
4951 struct ctl_table_header *sysctl_header;
fe2c6338 4952 struct ctl_table addrconf_vars[DEVCONF_MAX+1];
ab32ea5d 4953} addrconf_sysctl __read_mostly = {
1da177e4
LT		 4954 .sysctl_header = NULL,
4955 .addrconf_vars = {
1ab1457c 4956 {
e21e8467
SH		 4957 .procname = "forwarding",
4958 .data = &ipv6_devconf.forwarding,
4959 .maxlen = sizeof(int),
4960 .mode = 0644,
4961 .proc_handler = addrconf_sysctl_forward,
1da177e4
LT		 4962 },
4963 {
e21e8467
SH		 4964 .procname = "hop_limit",
4965 .data = &ipv6_devconf.hop_limit,
4966 .maxlen = sizeof(int),
4967 .mode = 0644,
4968 .proc_handler = proc_dointvec,
1da177e4
LT		 4969 },
4970 {
e21e8467
SH		 4971 .procname = "mtu",
4972 .data = &ipv6_devconf.mtu6,
4973 .maxlen = sizeof(int),
4974 .mode = 0644,
4975 .proc_handler = proc_dointvec,
1da177e4
LT		 4976 },
4977 {
e21e8467
SH		 4978 .procname = "accept_ra",
4979 .data = &ipv6_devconf.accept_ra,
4980 .maxlen = sizeof(int),
4981 .mode = 0644,
4982 .proc_handler = proc_dointvec,
1da177e4
LT		 4983 },
4984 {
e21e8467
SH		 4985 .procname = "accept_redirects",
4986 .data = &ipv6_devconf.accept_redirects,
4987 .maxlen = sizeof(int),
4988 .mode = 0644,
4989 .proc_handler = proc_dointvec,
1da177e4
LT		 4990 },
4991 {
e21e8467
SH		 4992 .procname = "autoconf",
4993 .data = &ipv6_devconf.autoconf,
4994 .maxlen = sizeof(int),
4995 .mode = 0644,
4996 .proc_handler = proc_dointvec,
1da177e4
LT		 4997 },
4998 {
e21e8467
SH		 4999 .procname = "dad_transmits",
5000 .data = &ipv6_devconf.dad_transmits,
5001 .maxlen = sizeof(int),
5002 .mode = 0644,
5003 .proc_handler = proc_dointvec,
1da177e4
LT		 5004 },
5005 {
e21e8467
SH		 5006 .procname = "router_solicitations",
5007 .data = &ipv6_devconf.rtr_solicits,
5008 .maxlen = sizeof(int),
5009 .mode = 0644,
5010 .proc_handler = proc_dointvec,
1da177e4
LT		 5011 },
5012 {
e21e8467
SH		 5013 .procname = "router_solicitation_interval",
5014 .data = &ipv6_devconf.rtr_solicit_interval,
5015 .maxlen = sizeof(int),
5016 .mode = 0644,
5017 .proc_handler = proc_dointvec_jiffies,
1da177e4
LT		 5018 },
5019 {
e21e8467
SH		 5020 .procname = "router_solicitation_delay",
5021 .data = &ipv6_devconf.rtr_solicit_delay,
5022 .maxlen = sizeof(int),
5023 .mode = 0644,
5024 .proc_handler = proc_dointvec_jiffies,
1da177e4
LT		 5025 },
5026 {
e21e8467
SH		 5027 .procname = "force_mld_version",
5028 .data = &ipv6_devconf.force_mld_version,
5029 .maxlen = sizeof(int),
5030 .mode = 0644,
5031 .proc_handler = proc_dointvec,
1da177e4 5032 },
fc4eba58
HFS		 5033 {
5034 .procname = "mldv1_unsolicited_report_interval",
5035 .data =
5036 &ipv6_devconf.mldv1_unsolicited_report_interval,
5037 .maxlen = sizeof(int),
5038 .mode = 0644,
5039 .proc_handler = proc_dointvec_ms_jiffies,
5040 },
5041 {
5042 .procname = "mldv2_unsolicited_report_interval",
5043 .data =
5044 &ipv6_devconf.mldv2_unsolicited_report_interval,
5045 .maxlen = sizeof(int),
5046 .mode = 0644,
5047 .proc_handler = proc_dointvec_ms_jiffies,
5048 },
1da177e4 5049 {
e21e8467
SH		 5050 .procname = "use_tempaddr",
5051 .data = &ipv6_devconf.use_tempaddr,
5052 .maxlen = sizeof(int),
5053 .mode = 0644,
5054 .proc_handler = proc_dointvec,
1da177e4
LT		 5055 },
5056 {
e21e8467
SH		 5057 .procname = "temp_valid_lft",
5058 .data = &ipv6_devconf.temp_valid_lft,
5059 .maxlen = sizeof(int),
5060 .mode = 0644,
5061 .proc_handler = proc_dointvec,
1da177e4
LT		 5062 },
5063 {
e21e8467
SH		 5064 .procname = "temp_prefered_lft",
5065 .data = &ipv6_devconf.temp_prefered_lft,
5066 .maxlen = sizeof(int),
5067 .mode = 0644,
5068 .proc_handler = proc_dointvec,
1da177e4
LT		 5069 },
5070 {
e21e8467
SH		 5071 .procname = "regen_max_retry",
5072 .data = &ipv6_devconf.regen_max_retry,
5073 .maxlen = sizeof(int),
5074 .mode = 0644,
5075 .proc_handler = proc_dointvec,
1da177e4
LT		 5076 },
5077 {
e21e8467
SH		 5078 .procname = "max_desync_factor",
5079 .data = &ipv6_devconf.max_desync_factor,
5080 .maxlen = sizeof(int),
5081 .mode = 0644,
5082 .proc_handler = proc_dointvec,
1da177e4 5083 },
1da177e4 5084 {
e21e8467
SH		 5085 .procname = "max_addresses",
5086 .data = &ipv6_devconf.max_addresses,
5087 .maxlen = sizeof(int),
5088 .mode = 0644,
5089 .proc_handler = proc_dointvec,
1da177e4 5090 },
65f5c7c1 5091 {
e21e8467
SH		 5092 .procname = "accept_ra_defrtr",
5093 .data = &ipv6_devconf.accept_ra_defrtr,
5094 .maxlen = sizeof(int),
5095 .mode = 0644,
5096 .proc_handler = proc_dointvec,
65f5c7c1 5097 },
c4fd30eb 5098 {
e21e8467
SH		 5099 .procname = "accept_ra_pinfo",
5100 .data = &ipv6_devconf.accept_ra_pinfo,
5101 .maxlen = sizeof(int),
5102 .mode = 0644,
5103 .proc_handler = proc_dointvec,
c4fd30eb 5104 },
930d6ff2
YH		 5105#ifdef CONFIG_IPV6_ROUTER_PREF
5106 {
e21e8467
SH		 5107 .procname = "accept_ra_rtr_pref",
5108 .data = &ipv6_devconf.accept_ra_rtr_pref,
5109 .maxlen = sizeof(int),
5110 .mode = 0644,
5111 .proc_handler = proc_dointvec,
930d6ff2 5112 },
52e16356 5113 {
e21e8467
SH		 5114 .procname = "router_probe_interval",
5115 .data = &ipv6_devconf.rtr_probe_interval,
5116 .maxlen = sizeof(int),
5117 .mode = 0644,
5118 .proc_handler = proc_dointvec_jiffies,
52e16356 5119 },
fa03ef38 5120#ifdef CONFIG_IPV6_ROUTE_INFO
09c884d4 5121 {
e21e8467
SH		 5122 .procname = "accept_ra_rt_info_max_plen",
5123 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
5124 .maxlen = sizeof(int),
5125 .mode = 0644,
5126 .proc_handler = proc_dointvec,
09c884d4
YH		 5127 },
5128#endif
930d6ff2 5129#endif
fbea49e1 5130 {
e21e8467
SH		 5131 .procname = "proxy_ndp",
5132 .data = &ipv6_devconf.proxy_ndp,
5133 .maxlen = sizeof(int),
5134 .mode = 0644,
c92d5491 5135 .proc_handler = addrconf_sysctl_proxy_ndp,
fbea49e1 5136 },
0bcbc926 5137 {
e21e8467
SH		 5138 .procname = "accept_source_route",
5139 .data = &ipv6_devconf.accept_source_route,
5140 .maxlen = sizeof(int),
5141 .mode = 0644,
5142 .proc_handler = proc_dointvec,
0bcbc926 5143 },
95c385b4
NH		 5144#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
5145 {
e21e8467
SH		 5146 .procname = "optimistic_dad",
5147 .data = &ipv6_devconf.optimistic_dad,
5148 .maxlen = sizeof(int),
5149 .mode = 0644,
5150 .proc_handler = proc_dointvec,
95c385b4
NH		 5151
5152 },
7bc570c8
YH		 5153#endif
5154#ifdef CONFIG_IPV6_MROUTE
5155 {
e21e8467
SH		 5156 .procname = "mc_forwarding",
5157 .data = &ipv6_devconf.mc_forwarding,
5158 .maxlen = sizeof(int),
5159 .mode = 0444,
5160 .proc_handler = proc_dointvec,
7bc570c8 5161 },
95c385b4 5162#endif
778d80be 5163 {
e21e8467
SH		 5164 .procname = "disable_ipv6",
5165 .data = &ipv6_devconf.disable_ipv6,
5166 .maxlen = sizeof(int),
5167 .mode = 0644,
5168 .proc_handler = addrconf_sysctl_disable,
778d80be 5169 },
1b34be74 5170 {
e21e8467
SH		 5171 .procname = "accept_dad",
5172 .data = &ipv6_devconf.accept_dad,
5173 .maxlen = sizeof(int),
5174 .mode = 0644,
5175 .proc_handler = proc_dointvec,
1b34be74 5176 },
f7734fdf 5177 {
f7734fdf
OP		 5178 .procname = "force_tllao",
5179 .data = &ipv6_devconf.force_tllao,
5180 .maxlen = sizeof(int),
5181 .mode = 0644,
5182 .proc_handler = proc_dointvec
5183 },
5cb04436
HFS		 5184 {
5185 .procname = "ndisc_notify",
5186 .data = &ipv6_devconf.ndisc_notify,
5187 .maxlen = sizeof(int),
5188 .mode = 0644,
5189 .proc_handler = proc_dointvec
5190 },
b800c3b9
HFS		 5191 {
5192 .procname = "suppress_frag_ndisc",
5193 .data = &ipv6_devconf.suppress_frag_ndisc,
5194 .maxlen = sizeof(int),
5195 .mode = 0644,
5196 .proc_handler = proc_dointvec
5197 },
d9333196
BG		 5198 {
5199 .procname = "accept_ra_from_local",
5200 .data = &ipv6_devconf.accept_ra_from_local,
5201 .maxlen = sizeof(int),
5202 .mode = 0644,
5203 .proc_handler = proc_dointvec,
5204 },
1da177e4 5205 {
f8572d8f 5206 /* sentinel */
1da177e4
LT		 5207 }
5208 },
1da177e4
LT		 5209};
5210
bff16c2f 5211static int __addrconf_sysctl_register(struct net *net, char *dev_name,
f8572d8f 5212 struct inet6_dev *idev, struct ipv6_devconf *p)
1da177e4
LT		 5213{
5214 int i;
1da177e4 5215 struct addrconf_sysctl_table *t;
6105e293 5216 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ];
1dab6222 5217
af879cc7 5218 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
1da177e4 5219 if (t == NULL)
f68635e6
PE		 5220 goto out;
5221
bcdd553f 5222 for (i = 0; t->addrconf_vars[i].data; i++) {
e21e8467 5223 t->addrconf_vars[i].data += (char *)p - (char *)&ipv6_devconf;
1da177e4 5224 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
bff16c2f 5225 t->addrconf_vars[i].extra2 = net;
1da177e4 5226 }
1da177e4 5227
6105e293 5228 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name);
1da177e4 5229
6105e293 5230 t->sysctl_header = register_net_sysctl(net, path, t->addrconf_vars);
1da177e4 5231 if (t->sysctl_header == NULL)
6105e293 5232 goto free;
f68635e6
PE		 5233
5234 p->sysctl = t;
95897312 5235 return 0;
1da177e4 5236
f68635e6 5237free:
1da177e4 5238 kfree(t);
f68635e6 5239out:
95897312 5240 return -ENOBUFS;
1da177e4
LT		 5241}
5242
408c4768
PE		 5243static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
5244{
5245 struct addrconf_sysctl_table *t;
5246
5247 if (p->sysctl == NULL)
5248 return;
5249
5250 t = p->sysctl;
5251 p->sysctl = NULL;
ff538818 5252 unregister_net_sysctl_table(t->sysctl_header);
408c4768
PE		 5253 kfree(t);
5254}
5255
a317a2f1 5256static int addrconf_sysctl_register(struct inet6_dev *idev)
f52295a9 5257{
a317a2f1
WC		 5258 int err;
5259
5260 if (!sysctl_dev_name_is_allowed(idev->dev->name))
5261 return -EINVAL;
5262
5263 err = neigh_sysctl_register(idev->dev, idev->nd_parms,
5264 &ndisc_ifinfo_sysctl_change);
5265 if (err)
5266 return err;
5267 err = __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
5268 idev, &idev->cnf);
5269 if (err)
5270 neigh_sysctl_unregister(idev->nd_parms);
5271
5272 return err;
f52295a9
PE		 5273}
5274
408c4768 5275static void addrconf_sysctl_unregister(struct inet6_dev *idev)
1da177e4 5276{
408c4768
PE		 5277 __addrconf_sysctl_unregister(&idev->cnf);
5278 neigh_sysctl_unregister(idev->nd_parms);
1da177e4
LT		 5279}
5280
5281
5282#endif
5283
2c8c1e72 5284static int __net_init addrconf_init_net(struct net *net)
e0da5a48 5285{
a79ca223 5286 int err = -ENOMEM;
e0da5a48
PE		 5287 struct ipv6_devconf *all, *dflt;
5288
a79ca223
HZ		 5289 all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL);
5290 if (all == NULL)
5291 goto err_alloc_all;
e0da5a48 5292
a79ca223
HZ		 5293 dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
5294 if (dflt == NULL)
5295 goto err_alloc_dflt;
e0da5a48 5296
a79ca223
HZ		 5297 /* these will be inherited by all namespaces */
5298 dflt->autoconf = ipv6_defaults.autoconf;
5299 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
e0da5a48
PE		 5300
5301 net->ipv6.devconf_all = all;
5302 net->ipv6.devconf_dflt = dflt;
5303
5304#ifdef CONFIG_SYSCTL
f8572d8f 5305 err = __addrconf_sysctl_register(net, "all", NULL, all);
e0da5a48
PE		 5306 if (err < 0)
5307 goto err_reg_all;
5308
f8572d8f 5309 err = __addrconf_sysctl_register(net, "default", NULL, dflt);
e0da5a48
PE		 5310 if (err < 0)
5311 goto err_reg_dflt;
5312#endif
5313 return 0;
5314
5315#ifdef CONFIG_SYSCTL
5316err_reg_dflt:
5317 __addrconf_sysctl_unregister(all);
5318err_reg_all:
5319 kfree(dflt);
5320#endif
5321err_alloc_dflt:
5322 kfree(all);
5323err_alloc_all:
5324 return err;
5325}
5326
2c8c1e72 5327static void __net_exit addrconf_exit_net(struct net *net)
e0da5a48
PE		 5328{
5329#ifdef CONFIG_SYSCTL
5330 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
5331 __addrconf_sysctl_unregister(net->ipv6.devconf_all);
5332#endif
09ad9bc7 5333 if (!net_eq(net, &init_net)) {
e0da5a48
PE		 5334 kfree(net->ipv6.devconf_dflt);
5335 kfree(net->ipv6.devconf_all);
5336 }
5337}
5338
5339static struct pernet_operations addrconf_ops = {
5340 .init = addrconf_init_net,
5341 .exit = addrconf_exit_net,
5342};
5343
b382b191
TG		 5344static struct rtnl_af_ops inet6_ops = {
5345 .family = AF_INET6,
5346 .fill_link_af = inet6_fill_link_af,
5347 .get_link_af_size = inet6_get_link_af_size,
f53adae4 5348 .set_link_af = inet6_set_link_af,
b382b191
TG		 5349};
5350
1da177e4
LT		 5351/*
5352 * Init / cleanup code
5353 */
5354
5355int __init addrconf_init(void)
5356{
a317a2f1 5357 struct inet6_dev *idev;
c2e21293 5358 int i, err;
2a8cc6c8 5359
e21e8467
SH		 5360 err = ipv6_addr_label_init();
5361 if (err < 0) {
f3213831
JP		 5362 pr_crit("%s: cannot initialize default policy table: %d\n",
5363 __func__, err);
2cc6d2bf 5364 goto out;
2a8cc6c8 5365 }
1da177e4 5366
2cc6d2bf
NH		 5367 err = register_pernet_subsys(&addrconf_ops);
5368 if (err < 0)
5369 goto out_addrlabel;
e0da5a48 5370
c15b1cca
HFS		 5371 addrconf_wq = create_workqueue("ipv6_addrconf");
5372 if (!addrconf_wq) {
5373 err = -ENOMEM;
5374 goto out_nowq;
5375 }
5376
1da177e4
LT		 5377 /* The addrconf netdev notifier requires that loopback_dev
5378 * has it's ipv6 private information allocated and setup
5379 * before it can bring up and give link-local addresses
5380 * to other devices which are up.
5381 *
5382 * Unfortunately, loopback_dev is not necessarily the first
5383 * entry in the global dev_base list of net devices. In fact,
5384 * it is likely to be the very last entry on that list.
5385 * So this causes the notifier registry below to try and
5386 * give link-local addresses to all devices besides loopback_dev
5387 * first, then loopback_dev, which cases all the non-loopback_dev
5388 * devices to fail to get a link-local address.
5389 *
5390 * So, as a temporary fix, allocate the ipv6 structure for
5391 * loopback_dev first by hand.
5392 * Longer term, all of the dependencies ipv6 has upon the loopback
5393 * device and it being up should be removed.
5394 */
5395 rtnl_lock();
a317a2f1 5396 idev = ipv6_add_dev(init_net.loopback_dev);
1da177e4 5397 rtnl_unlock();
a317a2f1
WC		 5398 if (IS_ERR(idev)) {
5399 err = PTR_ERR(idev);
e0da5a48 5400 goto errlo;
a317a2f1 5401 }
1da177e4 5402
c2e21293 5403 for (i = 0; i < IN6_ADDR_HSIZE; i++)
5404 INIT_HLIST_HEAD(&inet6_addr_lst[i]);
5405
1da177e4
LT		 5406 register_netdevice_notifier(&ipv6_dev_notf);
5407
c15b1cca 5408 addrconf_verify();
c127ea2c 5409
3678a9d8 5410 rtnl_af_register(&inet6_ops);
b382b191 5411
c7ac8679
GR		 5412 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo,
5413 NULL);
c127ea2c
TG		 5414 if (err < 0)
5415 goto errout;
5416
5417 /* Only the first call to __rtnl_register can fail */
c7ac8679
GR		 5418 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL, NULL);
5419 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL, NULL);
5420 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr,
5421 inet6_dump_ifaddr, NULL);
5422 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL,
5423 inet6_dump_ifmcaddr, NULL);
5424 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL,
5425 inet6_dump_ifacaddr, NULL);
76f8f6cb 5426 __rtnl_register(PF_INET6, RTM_GETNETCONF, inet6_netconf_get_devconf,
7a674200 5427 inet6_netconf_dump_devconf, NULL);
c127ea2c 5428
2a8cc6c8
YH		 5429 ipv6_addr_label_rtnl_register();
5430
1da177e4 5431 return 0;
c127ea2c 5432errout:
b382b191 5433 rtnl_af_unregister(&inet6_ops);
c127ea2c 5434 unregister_netdevice_notifier(&ipv6_dev_notf);
e0da5a48 5435errlo:
c15b1cca
HFS		 5436 destroy_workqueue(addrconf_wq);
5437out_nowq:
e0da5a48 5438 unregister_pernet_subsys(&addrconf_ops);
2cc6d2bf
NH		 5439out_addrlabel:
5440 ipv6_addr_label_cleanup();
5441out:
c127ea2c 5442 return err;
1da177e4
LT		 5443}
5444
09f7709f 5445void addrconf_cleanup(void)
1da177e4 5446{
176c39af 5447 struct net_device *dev;
1da177e4
LT		 5448 int i;
5449
5450 unregister_netdevice_notifier(&ipv6_dev_notf);
e0da5a48 5451 unregister_pernet_subsys(&addrconf_ops);
2cc6d2bf 5452 ipv6_addr_label_cleanup();
1da177e4
LT		 5453
5454 rtnl_lock();
5455
b382b191
TG		 5456 __rtnl_af_unregister(&inet6_ops);
5457
176c39af
DL		 5458 /* clean dev list */
5459 for_each_netdev(&init_net, dev) {
5460 if (__in6_dev_get(dev) == NULL)
5461 continue;
5462 addrconf_ifdown(dev, 1);
5463 }
5464 addrconf_ifdown(init_net.loopback_dev, 2);
5465
1da177e4
LT		 5466 /*
5467 * Check hash table.
5468 */
5c578aed 5469 spin_lock_bh(&addrconf_hash_lock);
c2e21293 5470 for (i = 0; i < IN6_ADDR_HSIZE; i++)
5471 WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
5c578aed 5472 spin_unlock_bh(&addrconf_hash_lock);
c15b1cca 5473 cancel_delayed_work(&addr_chk_work);
1da177e4 5474 rtnl_unlock();
c15b1cca
HFS		 5475
5476 destroy_workqueue(addrconf_wq);
1da177e4 5477}
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