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net: Allow userns root to control ipv6
[linux.git] / net / ipv6 / addrconf.c
CommitLineData
1da177e4
LT		 1/*
2 * IPv6 Address [auto]configuration
3 * Linux INET6 implementation
4 *
5 * Authors:
1ab1457c 6 * Pedro Roque <[email protected]>
1da177e4
LT		 7 * Alexey Kuznetsov <[email protected]>
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 * <[email protected]>
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>
1da177e4
LT		 73#include <net/ipv6.h>
74#include <net/protocol.h>
75#include <net/ndisc.h>
76#include <net/ip6_route.h>
77#include <net/addrconf.h>
78#include <net/tcp.h>
79#include <net/ip.h>
5d620266 80#include <net/netlink.h>
f24e3d65 81#include <net/pkt_sched.h>
1da177e4
LT		 82#include <linux/if_tunnel.h>
83#include <linux/rtnetlink.h>
f3a1bfb1 84#include <linux/netconf.h>
1da177e4
LT		 85
86#ifdef CONFIG_IPV6_PRIVACY
87#include <linux/random.h>
1da177e4
LT		 88#endif
89
e21e8467 90#include <linux/uaccess.h>
7f7d9a6b 91#include <asm/unaligned.h>
1da177e4
LT		 92
93#include <linux/proc_fs.h>
94#include <linux/seq_file.h>
bc3b2d7f 95#include <linux/export.h>
1da177e4
LT		 96
97/* Set to 3 to get tracing... */
98#define ACONF_DEBUG 2
99
100#if ACONF_DEBUG >= 3
101#define ADBG(x) printk x
102#else
103#define ADBG(x)
104#endif
105
106#define INFINITY_LIFE_TIME 0xFFFFFFFF
18a31e1e
TG		 107
108static inline u32 cstamp_delta(unsigned long cstamp)
109{
110 return (cstamp - INITIAL_JIFFIES) * 100UL / HZ;
111}
1da177e4 112
b2db7564
YH		 113#define ADDRCONF_TIMER_FUZZ_MINUS (HZ > 50 ? HZ/50 : 1)
114#define ADDRCONF_TIMER_FUZZ (HZ / 4)
115#define ADDRCONF_TIMER_FUZZ_MAX (HZ)
116
1da177e4 117#ifdef CONFIG_SYSCTL
f52295a9 118static void addrconf_sysctl_register(struct inet6_dev *idev);
408c4768
PE		 119static void addrconf_sysctl_unregister(struct inet6_dev *idev);
120#else
121static inline void addrconf_sysctl_register(struct inet6_dev *idev)
122{
123}
124
125static inline void addrconf_sysctl_unregister(struct inet6_dev *idev)
126{
127}
1da177e4
LT		 128#endif
129
130#ifdef CONFIG_IPV6_PRIVACY
eb7e0575
SD		 131static void __ipv6_regen_rndid(struct inet6_dev *idev);
132static void __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
1da177e4 133static void ipv6_regen_rndid(unsigned long data);
1da177e4
LT		 134#endif
135
1b34be74 136static int ipv6_generate_eui64(u8 *eui, struct net_device *dev);
1da177e4
LT		 137static int ipv6_count_addresses(struct inet6_dev *idev);
138
139/*
140 * Configured unicast address hash table
141 */
c2e21293 142static struct hlist_head inet6_addr_lst[IN6_ADDR_HSIZE];
5c578aed 143static DEFINE_SPINLOCK(addrconf_hash_lock);
1da177e4 144
1da177e4
LT		 145static void addrconf_verify(unsigned long);
146
8d06afab 147static DEFINE_TIMER(addr_chk_timer, addrconf_verify, 0, 0);
1da177e4
LT		 148static DEFINE_SPINLOCK(addrconf_verify_lock);
149
150static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
151static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
152
93d9b7d7
JP		 153static void addrconf_type_change(struct net_device *dev,
154 unsigned long event);
1da177e4
LT		 155static int addrconf_ifdown(struct net_device *dev, int how);
156
cf22f9a2 157static void addrconf_dad_start(struct inet6_ifaddr *ifp);
1da177e4
LT		 158static void addrconf_dad_timer(unsigned long data);
159static void addrconf_dad_completed(struct inet6_ifaddr *ifp);
c5e33bdd 160static void addrconf_dad_run(struct inet6_dev *idev);
1da177e4
LT		 161static void addrconf_rs_timer(unsigned long data);
162static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
163static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
164
1ab1457c 165static void inet6_prefix_notify(int event, struct inet6_dev *idev,
1da177e4 166 struct prefix_info *pinfo);
3e81c6da
DM		 167static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
168 struct net_device *dev);
1da177e4 169
e041c683 170static ATOMIC_NOTIFIER_HEAD(inet6addr_chain);
1da177e4 171
888c848e 172static struct ipv6_devconf ipv6_devconf __read_mostly = {
1da177e4
LT		 173 .forwarding = 0,
174 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
175 .mtu6 = IPV6_MIN_MTU,
176 .accept_ra = 1,
177 .accept_redirects = 1,
178 .autoconf = 1,
179 .force_mld_version = 0,
180 .dad_transmits = 1,
181 .rtr_solicits = MAX_RTR_SOLICITATIONS,
182 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
183 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
184#ifdef CONFIG_IPV6_PRIVACY
185 .use_tempaddr = 0,
186 .temp_valid_lft = TEMP_VALID_LIFETIME,
187 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
188 .regen_max_retry = REGEN_MAX_RETRY,
189 .max_desync_factor = MAX_DESYNC_FACTOR,
190#endif
191 .max_addresses = IPV6_MAX_ADDRESSES,
65f5c7c1 192 .accept_ra_defrtr = 1,
c4fd30eb 193 .accept_ra_pinfo = 1,
930d6ff2
YH		 194#ifdef CONFIG_IPV6_ROUTER_PREF
195 .accept_ra_rtr_pref = 1,
52e16356 196 .rtr_probe_interval = 60 * HZ,
09c884d4
YH		 197#ifdef CONFIG_IPV6_ROUTE_INFO
198 .accept_ra_rt_info_max_plen = 0,
199#endif
930d6ff2 200#endif
fbea49e1 201 .proxy_ndp = 0,
0bcbc926 202 .accept_source_route = 0, /* we do not accept RH0 by default. */
778d80be 203 .disable_ipv6 = 0,
1b34be74 204 .accept_dad = 1,
1da177e4
LT		 205};
206
ab32ea5d 207static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
1da177e4
LT		 208 .forwarding = 0,
209 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
210 .mtu6 = IPV6_MIN_MTU,
211 .accept_ra = 1,
212 .accept_redirects = 1,
213 .autoconf = 1,
214 .dad_transmits = 1,
215 .rtr_solicits = MAX_RTR_SOLICITATIONS,
216 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
217 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
218#ifdef CONFIG_IPV6_PRIVACY
219 .use_tempaddr = 0,
220 .temp_valid_lft = TEMP_VALID_LIFETIME,
221 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
222 .regen_max_retry = REGEN_MAX_RETRY,
223 .max_desync_factor = MAX_DESYNC_FACTOR,
224#endif
225 .max_addresses = IPV6_MAX_ADDRESSES,
65f5c7c1 226 .accept_ra_defrtr = 1,
c4fd30eb 227 .accept_ra_pinfo = 1,
930d6ff2
YH		 228#ifdef CONFIG_IPV6_ROUTER_PREF
229 .accept_ra_rtr_pref = 1,
52e16356 230 .rtr_probe_interval = 60 * HZ,
09c884d4
YH		 231#ifdef CONFIG_IPV6_ROUTE_INFO
232 .accept_ra_rt_info_max_plen = 0,
233#endif
930d6ff2 234#endif
fbea49e1 235 .proxy_ndp = 0,
0bcbc926 236 .accept_source_route = 0, /* we do not accept RH0 by default. */
778d80be 237 .disable_ipv6 = 0,
1b34be74 238 .accept_dad = 1,
1da177e4
LT		 239};
240
241/* IPv6 Wildcard Address and Loopback Address defined by RFC2553 */
1da177e4 242const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT;
1da177e4 243const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT;
f3ee4010
YH		 244const struct in6_addr in6addr_linklocal_allnodes = IN6ADDR_LINKLOCAL_ALLNODES_INIT;
245const struct in6_addr in6addr_linklocal_allrouters = IN6ADDR_LINKLOCAL_ALLROUTERS_INIT;
1da177e4 246
f24e3d65 247/* Check if a valid qdisc is available */
05297949 248static inline bool addrconf_qdisc_ok(const struct net_device *dev)
f24e3d65 249{
05297949 250 return !qdisc_tx_is_noop(dev);
f24e3d65
MC		 251}
252
2b5ead46
YH		 253/* Check if a route is valid prefix route */
254static inline int addrconf_is_prefix_route(const struct rt6_info *rt)
255{
a02cec21 256 return (rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0;
2b5ead46
YH		 257}
258
1da177e4
LT		 259static void addrconf_del_timer(struct inet6_ifaddr *ifp)
260{
261 if (del_timer(&ifp->timer))
262 __in6_ifa_put(ifp);
263}
264
e21e8467 265enum addrconf_timer_t {
1da177e4
LT		 266 AC_NONE,
267 AC_DAD,
268 AC_RS,
269};
270
271static void addrconf_mod_timer(struct inet6_ifaddr *ifp,
272 enum addrconf_timer_t what,
273 unsigned long when)
274{
275 if (!del_timer(&ifp->timer))
276 in6_ifa_hold(ifp);
277
278 switch (what) {
279 case AC_DAD:
280 ifp->timer.function = addrconf_dad_timer;
281 break;
282 case AC_RS:
283 ifp->timer.function = addrconf_rs_timer;
284 break;
e21e8467
SH		 285 default:
286 break;
1da177e4
LT		 287 }
288 ifp->timer.expires = jiffies + when;
289 add_timer(&ifp->timer);
290}
291
7f7d9a6b
HX		 292static int snmp6_alloc_dev(struct inet6_dev *idev)
293{
7d720c3e 294 if (snmp_mib_init((void __percpu **)idev->stats.ipv6,
1823e4c8
ED		 295 sizeof(struct ipstats_mib),
296 __alignof__(struct ipstats_mib)) < 0)
7f7d9a6b 297 goto err_ip;
be281e55
ED		 298 idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device),
299 GFP_KERNEL);
300 if (!idev->stats.icmpv6dev)
7f7d9a6b 301 goto err_icmp;
be281e55
ED		 302 idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device),
303 GFP_KERNEL);
304 if (!idev->stats.icmpv6msgdev)
14878f75 305 goto err_icmpmsg;
7f7d9a6b
HX		 306
307 return 0;
308
14878f75 309err_icmpmsg:
be281e55 310 kfree(idev->stats.icmpv6dev);
7f7d9a6b 311err_icmp:
7d720c3e 312 snmp_mib_free((void __percpu **)idev->stats.ipv6);
7f7d9a6b 313err_ip:
aaf70ec7 314 return -ENOMEM;
7f7d9a6b
HX		 315}
316
16910b98 317static void snmp6_free_dev(struct inet6_dev *idev)
7f7d9a6b 318{
be281e55
ED		 319 kfree(idev->stats.icmpv6msgdev);
320 kfree(idev->stats.icmpv6dev);
7d720c3e 321 snmp_mib_free((void __percpu **)idev->stats.ipv6);
7f7d9a6b
HX		 322}
323
1da177e4
LT		 324/* Nobody refers to this device, we may destroy it. */
325
326void in6_dev_finish_destroy(struct inet6_dev *idev)
327{
328 struct net_device *dev = idev->dev;
547b792c 329
502a2ffd 330 WARN_ON(!list_empty(&idev->addr_list));
547b792c
IJ		 331 WARN_ON(idev->mc_list != NULL);
332
1da177e4 333#ifdef NET_REFCNT_DEBUG
91df42be 334 pr_debug("%s: %s\n", __func__, dev ? dev->name : "NIL");
1da177e4
LT		 335#endif
336 dev_put(dev);
337 if (!idev->dead) {
f3213831 338 pr_warn("Freeing alive inet6 device %p\n", idev);
1da177e4
LT		 339 return;
340 }
341 snmp6_free_dev(idev);
38f57d1a 342 kfree_rcu(idev, rcu);
1da177e4 343}
7159039a
YH		 344EXPORT_SYMBOL(in6_dev_finish_destroy);
345
8e5e8f30 346static struct inet6_dev *ipv6_add_dev(struct net_device *dev)
1da177e4
LT		 347{
348 struct inet6_dev *ndev;
349
350 ASSERT_RTNL();
351
352 if (dev->mtu < IPV6_MIN_MTU)
353 return NULL;
354
1ab1457c 355 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
322f74a4 356
1ab1457c
YH		 357 if (ndev == NULL)
358 return NULL;
322f74a4
IO		 359
360 rwlock_init(&ndev->lock);
361 ndev->dev = dev;
502a2ffd 362 INIT_LIST_HEAD(&ndev->addr_list);
363
c346dca1 364 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf));
322f74a4
IO		 365 ndev->cnf.mtu6 = dev->mtu;
366 ndev->cnf.sysctl = NULL;
367 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
368 if (ndev->nd_parms == NULL) {
369 kfree(ndev);
370 return NULL;
371 }
0187bdfb
BH		 372 if (ndev->cnf.forwarding)
373 dev_disable_lro(dev);
322f74a4
IO		 374 /* We refer to the device */
375 dev_hold(dev);
1da177e4 376
322f74a4
IO		 377 if (snmp6_alloc_dev(ndev) < 0) {
378 ADBG((KERN_WARNING
f3213831 379 "%s: cannot allocate memory for statistics; dev=%s.\n",
0dc47877 380 __func__, dev->name));
322f74a4 381 neigh_parms_release(&nd_tbl, ndev->nd_parms);
8603e33d
RL		 382 dev_put(dev);
383 kfree(ndev);
322f74a4
IO		 384 return NULL;
385 }
1da177e4 386
322f74a4
IO		 387 if (snmp6_register_dev(ndev) < 0) {
388 ADBG((KERN_WARNING
f3213831 389 "%s: cannot create /proc/net/dev_snmp6/%s\n",
0dc47877 390 __func__, dev->name));
322f74a4
IO		 391 neigh_parms_release(&nd_tbl, ndev->nd_parms);
392 ndev->dead = 1;
393 in6_dev_finish_destroy(ndev);
394 return NULL;
395 }
396
397 /* One reference from device. We must do this before
398 * we invoke __ipv6_regen_rndid().
399 */
400 in6_dev_hold(ndev);
1da177e4 401
1b34be74
YH		 402 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
403 ndev->cnf.accept_dad = -1;
404
07a93626 405#if IS_ENABLED(CONFIG_IPV6_SIT)
b077d7ab 406 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
f3213831 407 pr_info("%s: Disabled Multicast RS\n", dev->name);
b077d7ab
YH		 408 ndev->cnf.rtr_solicits = 0;
409 }
410#endif
411
1da177e4 412#ifdef CONFIG_IPV6_PRIVACY
372e6c8f 413 INIT_LIST_HEAD(&ndev->tempaddr_list);
b24b8a24 414 setup_timer(&ndev->regen_timer, ipv6_regen_rndid, (unsigned long)ndev);
322f74a4
IO		 415 if ((dev->flags&IFF_LOOPBACK) ||
416 dev->type == ARPHRD_TUNNEL ||
9625ed72 417 dev->type == ARPHRD_TUNNEL6 ||
0be669bb 418 dev->type == ARPHRD_SIT ||
0be669bb 419 dev->type == ARPHRD_NONE) {
322f74a4
IO		 420 ndev->cnf.use_tempaddr = -1;
421 } else {
422 in6_dev_hold(ndev);
423 ipv6_regen_rndid((unsigned long) ndev);
424 }
1da177e4
LT		 425#endif
426
f24e3d65 427 if (netif_running(dev) && addrconf_qdisc_ok(dev))
53aadcc9
HX		 428 ndev->if_flags |= IF_READY;
429
322f74a4
IO		 430 ipv6_mc_init_dev(ndev);
431 ndev->tstamp = jiffies;
f52295a9 432 addrconf_sysctl_register(ndev);
30c4cf57 433 /* protected by rtnl_lock */
cf778b00 434 rcu_assign_pointer(dev->ip6_ptr, ndev);
d88ae4cc
YH		 435
436 /* Join all-node multicast group */
f3ee4010 437 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);
d88ae4cc 438
d6ddef9e 439 /* Join all-router multicast group if forwarding is set */
8b2aaede 440 if (ndev->cnf.forwarding && (dev->flags & IFF_MULTICAST))
d6ddef9e
LW		 441 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
442
1da177e4
LT		 443 return ndev;
444}
445
8e5e8f30 446static struct inet6_dev *ipv6_find_idev(struct net_device *dev)
1da177e4
LT		 447{
448 struct inet6_dev *idev;
449
450 ASSERT_RTNL();
451
e21e8467
SH		 452 idev = __in6_dev_get(dev);
453 if (!idev) {
454 idev = ipv6_add_dev(dev);
455 if (!idev)
1da177e4
LT		 456 return NULL;
457 }
c5e33bdd 458
1da177e4
LT		 459 if (dev->flags&IFF_UP)
460 ipv6_mc_up(idev);
461 return idev;
462}
463
f3a1bfb1
ND		 464static int inet6_netconf_msgsize_devconf(int type)
465{
466 int size = NLMSG_ALIGN(sizeof(struct netconfmsg))
467 + nla_total_size(4); /* NETCONFA_IFINDEX */
468
76f8f6cb
ND		 469 /* type -1 is used for ALL */
470 if (type == -1 || type == NETCONFA_FORWARDING)
f3a1bfb1
ND		 471 size += nla_total_size(4);
472
473 return size;
474}
475
476static int inet6_netconf_fill_devconf(struct sk_buff *skb, int ifindex,
477 struct ipv6_devconf *devconf, u32 portid,
478 u32 seq, int event, unsigned int flags,
479 int type)
480{
481 struct nlmsghdr *nlh;
482 struct netconfmsg *ncm;
483
484 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg),
485 flags);
486 if (nlh == NULL)
487 return -EMSGSIZE;
488
489 ncm = nlmsg_data(nlh);
490 ncm->ncm_family = AF_INET6;
491
492 if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0)
493 goto nla_put_failure;
494
76f8f6cb
ND		 495 /* type -1 is used for ALL */
496 if ((type == -1 || type == NETCONFA_FORWARDING) &&
f3a1bfb1
ND		 497 nla_put_s32(skb, NETCONFA_FORWARDING, devconf->forwarding) < 0)
498 goto nla_put_failure;
499
500 return nlmsg_end(skb, nlh);
501
502nla_put_failure:
503 nlmsg_cancel(skb, nlh);
504 return -EMSGSIZE;
505}
506
507static void inet6_netconf_notify_devconf(struct net *net, int type, int ifindex,
508 struct ipv6_devconf *devconf)
509{
510 struct sk_buff *skb;
511 int err = -ENOBUFS;
512
513 skb = nlmsg_new(inet6_netconf_msgsize_devconf(type), GFP_ATOMIC);
514 if (skb == NULL)
515 goto errout;
516
517 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 0, 0,
518 RTM_NEWNETCONF, 0, type);
519 if (err < 0) {
520 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
521 WARN_ON(err == -EMSGSIZE);
522 kfree_skb(skb);
523 goto errout;
524 }
525 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_NETCONF, NULL, GFP_ATOMIC);
526 return;
527errout:
528 if (err < 0)
529 rtnl_set_sk_err(net, RTNLGRP_IPV6_NETCONF, err);
530}
531
76f8f6cb
ND		 532static const struct nla_policy devconf_ipv6_policy[NETCONFA_MAX+1] = {
533 [NETCONFA_IFINDEX] = { .len = sizeof(int) },
534 [NETCONFA_FORWARDING] = { .len = sizeof(int) },
535};
536
537static int inet6_netconf_get_devconf(struct sk_buff *in_skb,
538 struct nlmsghdr *nlh,
539 void *arg)
540{
541 struct net *net = sock_net(in_skb->sk);
542 struct nlattr *tb[NETCONFA_MAX+1];
543 struct netconfmsg *ncm;
544 struct sk_buff *skb;
545 struct ipv6_devconf *devconf;
546 struct inet6_dev *in6_dev;
547 struct net_device *dev;
548 int ifindex;
549 int err;
550
551 err = nlmsg_parse(nlh, sizeof(*ncm), tb, NETCONFA_MAX,
552 devconf_ipv6_policy);
553 if (err < 0)
554 goto errout;
555
556 err = EINVAL;
557 if (!tb[NETCONFA_IFINDEX])
558 goto errout;
559
560 ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]);
561 switch (ifindex) {
562 case NETCONFA_IFINDEX_ALL:
563 devconf = net->ipv6.devconf_all;
564 break;
565 case NETCONFA_IFINDEX_DEFAULT:
566 devconf = net->ipv6.devconf_dflt;
567 break;
568 default:
569 dev = __dev_get_by_index(net, ifindex);
570 if (dev == NULL)
571 goto errout;
572 in6_dev = __in6_dev_get(dev);
573 if (in6_dev == NULL)
574 goto errout;
575 devconf = &in6_dev->cnf;
576 break;
577 }
578
579 err = -ENOBUFS;
580 skb = nlmsg_new(inet6_netconf_msgsize_devconf(-1), GFP_ATOMIC);
581 if (skb == NULL)
582 goto errout;
583
584 err = inet6_netconf_fill_devconf(skb, ifindex, devconf,
585 NETLINK_CB(in_skb).portid,
586 nlh->nlmsg_seq, RTM_NEWNETCONF, 0,
587 -1);
588 if (err < 0) {
589 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
590 WARN_ON(err == -EMSGSIZE);
591 kfree_skb(skb);
592 goto errout;
593 }
594 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
595errout:
596 return err;
597}
598
1da177e4
LT		 599#ifdef CONFIG_SYSCTL
600static void dev_forward_change(struct inet6_dev *idev)
601{
602 struct net_device *dev;
603 struct inet6_ifaddr *ifa;
1da177e4
LT		 604
605 if (!idev)
606 return;
607 dev = idev->dev;
0187bdfb
BH		 608 if (idev->cnf.forwarding)
609 dev_disable_lro(dev);
1a940835 610 if (dev->flags & IFF_MULTICAST) {
1da177e4 611 if (idev->cnf.forwarding)
f3ee4010 612 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
1da177e4 613 else
f3ee4010 614 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
1da177e4 615 }
502a2ffd 616
617 list_for_each_entry(ifa, &idev->addr_list, if_list) {
2c12a74c
MW		 618 if (ifa->flags&IFA_F_TENTATIVE)
619 continue;
1da177e4
LT		 620 if (idev->cnf.forwarding)
621 addrconf_join_anycast(ifa);
622 else
623 addrconf_leave_anycast(ifa);
624 }
f3a1bfb1
ND		 625 inet6_netconf_notify_devconf(dev_net(dev), NETCONFA_FORWARDING,
626 dev->ifindex, &idev->cnf);
1da177e4
LT		 627}
628
629
e186932b 630static void addrconf_forward_change(struct net *net, __s32 newf)
1da177e4
LT		 631{
632 struct net_device *dev;
633 struct inet6_dev *idev;
634
4acd4945 635 for_each_netdev(net, dev) {
1da177e4
LT		 636 idev = __in6_dev_get(dev);
637 if (idev) {
e186932b
PE		 638 int changed = (!idev->cnf.forwarding) ^ (!newf);
639 idev->cnf.forwarding = newf;
1da177e4
LT		 640 if (changed)
641 dev_forward_change(idev);
642 }
1da177e4 643 }
1da177e4 644}
c8fecf22 645
013d97e9 646static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf)
c8fecf22 647{
bff16c2f 648 struct net *net;
013d97e9
FR		 649 int old;
650
651 if (!rtnl_trylock())
652 return restart_syscall();
bff16c2f
PE		 653
654 net = (struct net *)table->extra2;
013d97e9
FR		 655 old = *p;
656 *p = newf;
b325fddb 657
013d97e9 658 if (p == &net->ipv6.devconf_dflt->forwarding) {
f3a1bfb1
ND		 659 if ((!newf) ^ (!old))
660 inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING,
661 NETCONFA_IFINDEX_DEFAULT,
662 net->ipv6.devconf_dflt);
013d97e9
FR		 663 rtnl_unlock();
664 return 0;
88af182e 665 }
c8fecf22 666
e186932b 667 if (p == &net->ipv6.devconf_all->forwarding) {
e186932b
PE		 668 net->ipv6.devconf_dflt->forwarding = newf;
669 addrconf_forward_change(net, newf);
f3a1bfb1
ND		 670 if ((!newf) ^ (!old))
671 inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING,
672 NETCONFA_IFINDEX_ALL,
673 net->ipv6.devconf_all);
013d97e9 674 } else if ((!newf) ^ (!old))
c8fecf22 675 dev_forward_change((struct inet6_dev *)table->extra1);
0187bdfb 676 rtnl_unlock();
c8fecf22 677
013d97e9 678 if (newf)
7b4da532 679 rt6_purge_dflt_routers(net);
b325fddb 680 return 1;
c8fecf22 681}
1da177e4
LT		 682#endif
683
5c578aed 684/* Nobody refers to this ifaddr, destroy it */
1da177e4
LT		 685void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
686{
c2e21293 687 WARN_ON(!hlist_unhashed(&ifp->addr_lst));
547b792c 688
1da177e4 689#ifdef NET_REFCNT_DEBUG
91df42be 690 pr_debug("%s\n", __func__);
1da177e4
LT		 691#endif
692
693 in6_dev_put(ifp->idev);
694
695 if (del_timer(&ifp->timer))
e21e8467 696 pr_notice("Timer is still running, when freeing ifa=%p\n", ifp);
1da177e4 697
e9d3e084 698 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
f3213831 699 pr_warn("Freeing alive inet6 address %p\n", ifp);
1da177e4
LT		 700 return;
701 }
94e187c0 702 ip6_rt_put(ifp->rt);
1da177e4 703
e5785985 704 kfree_rcu(ifp, rcu);
1da177e4
LT		 705}
706
e55ffac6
BH		 707static void
708ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
709{
502a2ffd 710 struct list_head *p;
8a6ce0c0 711 int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
e55ffac6
BH		 712
713 /*
714 * Each device address list is sorted in order of scope -
715 * global before linklocal.
716 */
502a2ffd 717 list_for_each(p, &idev->addr_list) {
718 struct inet6_ifaddr *ifa
719 = list_entry(p, struct inet6_ifaddr, if_list);
8a6ce0c0 720 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
e55ffac6
BH		 721 break;
722 }
723
b54c9b98 724 list_add_tail(&ifp->if_list, p);
e55ffac6
BH		 725}
726
ddbe5032 727static u32 inet6_addr_hash(const struct in6_addr *addr)
3eb84f49 728{
ddbe5032 729 return hash_32(ipv6_addr_hash(addr), IN6_ADDR_HSIZE_SHIFT);
3eb84f49
YH		 730}
731
1da177e4
LT		 732/* On success it returns ifp with increased reference count */
733
734static struct inet6_ifaddr *
735ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, int pfxlen,
e431b8c0 736 int scope, u32 flags)
1da177e4
LT		 737{
738 struct inet6_ifaddr *ifa = NULL;
739 struct rt6_info *rt;
3a88a81d 740 unsigned int hash;
1da177e4 741 int err = 0;
d68b8270
YH		 742 int addr_type = ipv6_addr_type(addr);
743
744 if (addr_type == IPV6_ADDR_ANY ||
745 addr_type & IPV6_ADDR_MULTICAST ||
746 (!(idev->dev->flags & IFF_LOOPBACK) &&
747 addr_type & IPV6_ADDR_LOOPBACK))
748 return ERR_PTR(-EADDRNOTAVAIL);
1da177e4 749
8814c4b5 750 rcu_read_lock_bh();
1da177e4
LT		 751 if (idev->dead) {
752 err = -ENODEV; /*XXX*/
753 goto out2;
754 }
755
56d417b1 756 if (idev->cnf.disable_ipv6) {
9bdd8d40
BH		 757 err = -EACCES;
758 goto out2;
759 }
760
5c578aed 761 spin_lock(&addrconf_hash_lock);
1da177e4
LT		 762
763 /* Ignore adding duplicate addresses on an interface */
c346dca1 764 if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) {
1da177e4
LT		 765 ADBG(("ipv6_add_addr: already assigned\n"));
766 err = -EEXIST;
767 goto out;
768 }
769
322f74a4 770 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
1da177e4
LT		 771
772 if (ifa == NULL) {
773 ADBG(("ipv6_add_addr: malloc failed\n"));
774 err = -ENOBUFS;
775 goto out;
776 }
777
8f031519 778 rt = addrconf_dst_alloc(idev, addr, false);
1da177e4
LT		 779 if (IS_ERR(rt)) {
780 err = PTR_ERR(rt);
781 goto out;
782 }
783
4e3fd7a0 784 ifa->addr = *addr;
1da177e4
LT		 785
786 spin_lock_init(&ifa->lock);
e9d3e084 787 spin_lock_init(&ifa->state_lock);
1da177e4 788 init_timer(&ifa->timer);
c2e21293 789 INIT_HLIST_NODE(&ifa->addr_lst);
1da177e4
LT		 790 ifa->timer.data = (unsigned long) ifa;
791 ifa->scope = scope;
792 ifa->prefix_len = pfxlen;
793 ifa->flags = flags | IFA_F_TENTATIVE;
794 ifa->cstamp = ifa->tstamp = jiffies;
795
57f5f544
KF		 796 ifa->rt = rt;
797
1da177e4
LT		 798 ifa->idev = idev;
799 in6_dev_hold(idev);
800 /* For caller */
801 in6_ifa_hold(ifa);
802
803 /* Add to big hash table */
ddbe5032 804 hash = inet6_addr_hash(addr);
1da177e4 805
5c578aed 806 hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]);
5c578aed 807 spin_unlock(&addrconf_hash_lock);
1da177e4
LT		 808
809 write_lock(&idev->lock);
810 /* Add to inet6_dev unicast addr list. */
e55ffac6 811 ipv6_link_dev_addr(idev, ifa);
1da177e4
LT		 812
813#ifdef CONFIG_IPV6_PRIVACY
814 if (ifa->flags&IFA_F_TEMPORARY) {
372e6c8f 815 list_add(&ifa->tmp_list, &idev->tempaddr_list);
1da177e4
LT		 816 in6_ifa_hold(ifa);
817 }
818#endif
819
1da177e4
LT		 820 in6_ifa_hold(ifa);
821 write_unlock(&idev->lock);
822out2:
8814c4b5 823 rcu_read_unlock_bh();
1da177e4 824
fd92833a 825 if (likely(err == 0))
e041c683 826 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_UP, ifa);
1da177e4
LT		 827 else {
828 kfree(ifa);
829 ifa = ERR_PTR(err);
830 }
831
832 return ifa;
833out:
5c578aed 834 spin_unlock(&addrconf_hash_lock);
1da177e4
LT		 835 goto out2;
836}
837
838/* This function wants to get referenced ifp and releases it before return */
839
840static void ipv6_del_addr(struct inet6_ifaddr *ifp)
841{
502a2ffd 842 struct inet6_ifaddr *ifa, *ifn;
1da177e4 843 struct inet6_dev *idev = ifp->idev;
4c5ff6a6 844 int state;
1da177e4
LT		 845 int deleted = 0, onlink = 0;
846 unsigned long expires = jiffies;
847
4c5ff6a6
HX		 848 spin_lock_bh(&ifp->state_lock);
849 state = ifp->state;
e9d3e084 850 ifp->state = INET6_IFADDR_STATE_DEAD;
4c5ff6a6
HX		 851 spin_unlock_bh(&ifp->state_lock);
852
853 if (state == INET6_IFADDR_STATE_DEAD)
854 goto out;
1da177e4 855
5c578aed 856 spin_lock_bh(&addrconf_hash_lock);
857 hlist_del_init_rcu(&ifp->addr_lst);
5c578aed 858 spin_unlock_bh(&addrconf_hash_lock);
1da177e4
LT		 859
860 write_lock_bh(&idev->lock);
861#ifdef CONFIG_IPV6_PRIVACY
862 if (ifp->flags&IFA_F_TEMPORARY) {
372e6c8f 863 list_del(&ifp->tmp_list);
864 if (ifp->ifpub) {
865 in6_ifa_put(ifp->ifpub);
866 ifp->ifpub = NULL;
1da177e4 867 }
372e6c8f 868 __in6_ifa_put(ifp);
1da177e4
LT		 869 }
870#endif
871
502a2ffd 872 list_for_each_entry_safe(ifa, ifn, &idev->addr_list, if_list) {
1da177e4 873 if (ifa == ifp) {
502a2ffd 874 list_del_init(&ifp->if_list);
1da177e4 875 __in6_ifa_put(ifp);
502a2ffd 876
1da177e4
LT		 877 if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0)
878 break;
879 deleted = 1;
1d142804 880 continue;
1da177e4
LT		 881 } else if (ifp->flags & IFA_F_PERMANENT) {
882 if (ipv6_prefix_equal(&ifa->addr, &ifp->addr,
883 ifp->prefix_len)) {
884 if (ifa->flags & IFA_F_PERMANENT) {
885 onlink = 1;
886 if (deleted)
887 break;
888 } else {
889 unsigned long lifetime;
890
891 if (!onlink)
892 onlink = -1;
893
894 spin_lock(&ifa->lock);
4bed72e4
YH		 895
896 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
897 /*
898 * Note: Because this address is
899 * not permanent, lifetime <
900 * LONG_MAX / HZ here.
901 */
1da177e4
LT		 902 if (time_before(expires,
903 ifa->tstamp + lifetime * HZ))
904 expires = ifa->tstamp + lifetime * HZ;
905 spin_unlock(&ifa->lock);
906 }
907 }
908 }
909 }
910 write_unlock_bh(&idev->lock);
911
b2238566
AV		 912 addrconf_del_timer(ifp);
913
1da177e4
LT		 914 ipv6_ifa_notify(RTM_DELADDR, ifp);
915
e041c683 916 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifp);
1da177e4 917
1da177e4
LT		 918 /*
919 * Purge or update corresponding prefix
920 *
921 * 1) we don't purge prefix here if address was not permanent.
922 * prefix is managed by its own lifetime.
923 * 2) if there're no addresses, delete prefix.
924 * 3) if there're still other permanent address(es),
925 * corresponding prefix is still permanent.
926 * 4) otherwise, update prefix lifetime to the
927 * longest valid lifetime among the corresponding
928 * addresses on the device.
929 * Note: subsequent RA will update lifetime.
930 *
931 * --yoshfuji
932 */
933 if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) {
934 struct in6_addr prefix;
935 struct rt6_info *rt;
c346dca1 936 struct net *net = dev_net(ifp->idev->dev);
64c6d08e
ND		 937 struct flowi6 fl6 = {};
938
1da177e4 939 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len);
64c6d08e
ND		 940 fl6.flowi6_oif = ifp->idev->dev->ifindex;
941 fl6.daddr = prefix;
942 rt = (struct rt6_info *)ip6_route_lookup(net, &fl6,
943 RT6_LOOKUP_F_IFACE);
1da177e4 944
64c6d08e
ND		 945 if (rt != net->ipv6.ip6_null_entry &&
946 addrconf_is_prefix_route(rt)) {
1da177e4 947 if (onlink == 0) {
e0a1ad73 948 ip6_del_rt(rt);
1da177e4
LT		 949 rt = NULL;
950 } else if (!(rt->rt6i_flags & RTF_EXPIRES)) {
1716a961 951 rt6_set_expires(rt, expires);
1da177e4
LT		 952 }
953 }
94e187c0 954 ip6_rt_put(rt);
1da177e4
LT		 955 }
956
c3968a85
DW		 957 /* clean up prefsrc entries */
958 rt6_remove_prefsrc(ifp);
4c5ff6a6 959out:
1da177e4
LT		 960 in6_ifa_put(ifp);
961}
962
963#ifdef CONFIG_IPV6_PRIVACY
964static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
965{
966 struct inet6_dev *idev = ifp->idev;
967 struct in6_addr addr, *tmpaddr;
76f793e3 968 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_tstamp, age;
eac55bf9 969 unsigned long regen_advance;
1da177e4
LT		 970 int tmp_plen;
971 int ret = 0;
972 int max_addresses;
95c385b4 973 u32 addr_flags;
76f793e3 974 unsigned long now = jiffies;
1da177e4
LT		 975
976 write_lock(&idev->lock);
977 if (ift) {
978 spin_lock_bh(&ift->lock);
979 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
980 spin_unlock_bh(&ift->lock);
981 tmpaddr = &addr;
982 } else {
983 tmpaddr = NULL;
984 }
985retry:
986 in6_dev_hold(idev);
987 if (idev->cnf.use_tempaddr <= 0) {
988 write_unlock(&idev->lock);
f3213831 989 pr_info("%s: use_tempaddr is disabled\n", __func__);
1da177e4
LT		 990 in6_dev_put(idev);
991 ret = -1;
992 goto out;
993 }
994 spin_lock_bh(&ifp->lock);
995 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
996 idev->cnf.use_tempaddr = -1; /*XXX*/
997 spin_unlock_bh(&ifp->lock);
998 write_unlock(&idev->lock);
f3213831
JP		 999 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n",
1000 __func__);
1da177e4
LT		 1001 in6_dev_put(idev);
1002 ret = -1;
1003 goto out;
1004 }
1005 in6_ifa_hold(ifp);
1006 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
eb7e0575 1007 __ipv6_try_regen_rndid(idev, tmpaddr);
1da177e4 1008 memcpy(&addr.s6_addr[8], idev->rndid, 8);
76f793e3 1009 age = (now - ifp->tstamp) / HZ;
1da177e4
LT		 1010 tmp_valid_lft = min_t(__u32,
1011 ifp->valid_lft,
7a876b0e 1012 idev->cnf.temp_valid_lft + age);
1ab1457c
YH		 1013 tmp_prefered_lft = min_t(__u32,
1014 ifp->prefered_lft,
7a876b0e 1015 idev->cnf.temp_prefered_lft + age -
784e2710 1016 idev->cnf.max_desync_factor);
1da177e4
LT		 1017 tmp_plen = ifp->prefix_len;
1018 max_addresses = idev->cnf.max_addresses;
1da177e4
LT		 1019 tmp_tstamp = ifp->tstamp;
1020 spin_unlock_bh(&ifp->lock);
1021
eac55bf9
BB		 1022 regen_advance = idev->cnf.regen_max_retry *
1023 idev->cnf.dad_transmits *
1024 idev->nd_parms->retrans_time / HZ;
1da177e4 1025 write_unlock(&idev->lock);
95c385b4 1026
eac55bf9
BB		 1027 /* A temporary address is created only if this calculated Preferred
1028 * Lifetime is greater than REGEN_ADVANCE time units. In particular,
1029 * an implementation must not create a temporary address with a zero
1030 * Preferred Lifetime.
1031 */
1032 if (tmp_prefered_lft <= regen_advance) {
1033 in6_ifa_put(ifp);
1034 in6_dev_put(idev);
1035 ret = -1;
1036 goto out;
1037 }
1038
95c385b4
NH		 1039 addr_flags = IFA_F_TEMPORARY;
1040 /* set in addrconf_prefix_rcv() */
1041 if (ifp->flags & IFA_F_OPTIMISTIC)
1042 addr_flags |= IFA_F_OPTIMISTIC;
1043
1da177e4 1044 ift = !max_addresses ||
1ab1457c 1045 ipv6_count_addresses(idev) < max_addresses ?
1da177e4 1046 ipv6_add_addr(idev, &addr, tmp_plen,
95c385b4
NH		 1047 ipv6_addr_type(&addr)&IPV6_ADDR_SCOPE_MASK,
1048 addr_flags) : NULL;
1da177e4
LT		 1049 if (!ift || IS_ERR(ift)) {
1050 in6_ifa_put(ifp);
1051 in6_dev_put(idev);
f3213831 1052 pr_info("%s: retry temporary address regeneration\n", __func__);
1da177e4
LT		 1053 tmpaddr = &addr;
1054 write_lock(&idev->lock);
1055 goto retry;
1056 }
1057
1058 spin_lock_bh(&ift->lock);
1059 ift->ifpub = ifp;
1060 ift->valid_lft = tmp_valid_lft;
1061 ift->prefered_lft = tmp_prefered_lft;
76f793e3 1062 ift->cstamp = now;
1da177e4
LT		 1063 ift->tstamp = tmp_tstamp;
1064 spin_unlock_bh(&ift->lock);
1065
cf22f9a2 1066 addrconf_dad_start(ift);
1da177e4
LT		 1067 in6_ifa_put(ift);
1068 in6_dev_put(idev);
1069out:
1070 return ret;
1071}
1072#endif
1073
1074/*
072047e4 1075 * Choose an appropriate source address (RFC3484)
1da177e4 1076 */
a9b05723
YH		 1077enum {
1078 IPV6_SADDR_RULE_INIT = 0,
1079 IPV6_SADDR_RULE_LOCAL,
1080 IPV6_SADDR_RULE_SCOPE,
1081 IPV6_SADDR_RULE_PREFERRED,
1082#ifdef CONFIG_IPV6_MIP6
1083 IPV6_SADDR_RULE_HOA,
1084#endif
1085 IPV6_SADDR_RULE_OIF,
1086 IPV6_SADDR_RULE_LABEL,
1087#ifdef CONFIG_IPV6_PRIVACY
1088 IPV6_SADDR_RULE_PRIVACY,
1089#endif
1090 IPV6_SADDR_RULE_ORCHID,
1091 IPV6_SADDR_RULE_PREFIX,
1092 IPV6_SADDR_RULE_MAX
1093};
1094
072047e4 1095struct ipv6_saddr_score {
a9b05723
YH		 1096 int rule;
1097 int addr_type;
1098 struct inet6_ifaddr *ifa;
1099 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
1100 int scopedist;
1101 int matchlen;
072047e4
YH		 1102};
1103
a9b05723 1104struct ipv6_saddr_dst {
9acd9f3a 1105 const struct in6_addr *addr;
a9b05723
YH		 1106 int ifindex;
1107 int scope;
1108 int label;
7cbca67c 1109 unsigned int prefs;
a9b05723 1110};
072047e4 1111
b6f99a21 1112static inline int ipv6_saddr_preferred(int type)
1da177e4 1113{
45bb0060 1114 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
072047e4
YH		 1115 return 1;
1116 return 0;
1da177e4
LT		 1117}
1118
3de23255
BT		 1119static int ipv6_get_saddr_eval(struct net *net,
1120 struct ipv6_saddr_score *score,
a9b05723
YH		 1121 struct ipv6_saddr_dst *dst,
1122 int i)
1123{
1124 int ret;
1125
1126 if (i <= score->rule) {
1127 switch (i) {
1128 case IPV6_SADDR_RULE_SCOPE:
1129 ret = score->scopedist;
1130 break;
1131 case IPV6_SADDR_RULE_PREFIX:
1132 ret = score->matchlen;
1133 break;
1134 default:
1135 ret = !!test_bit(i, score->scorebits);
1136 }
1137 goto out;
1138 }
1139
1140 switch (i) {
1141 case IPV6_SADDR_RULE_INIT:
1142 /* Rule 0: remember if hiscore is not ready yet */
1143 ret = !!score->ifa;
1144 break;
1145 case IPV6_SADDR_RULE_LOCAL:
1146 /* Rule 1: Prefer same address */
1147 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1148 break;
1149 case IPV6_SADDR_RULE_SCOPE:
1150 /* Rule 2: Prefer appropriate scope
1151 *
1152 * ret
1153 * ^
1154 * -1 | d 15
1155 * ---+--+-+---> scope
1156 * |
1157 * | d is scope of the destination.
1158 * B-d | \
1159 * | \ <- smaller scope is better if
1160 * B-15 | \ if scope is enough for destinaion.
1161 * | ret = B - scope (-1 <= scope >= d <= 15).
1162 * d-C-1 | /
1163 * |/ <- greater is better
1164 * -C / if scope is not enough for destination.
1165 * /| ret = scope - C (-1 <= d < scope <= 15).
1166 *
1167 * d - C - 1 < B -15 (for all -1 <= d <= 15).
1168 * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1169 * Assume B = 0 and we get C > 29.
1170 */
1171 ret = __ipv6_addr_src_scope(score->addr_type);
1172 if (ret >= dst->scope)
1173 ret = -ret;
1174 else
1175 ret -= 128; /* 30 is enough */
1176 score->scopedist = ret;
1177 break;
1178 case IPV6_SADDR_RULE_PREFERRED:
1179 /* Rule 3: Avoid deprecated and optimistic addresses */
1180 ret = ipv6_saddr_preferred(score->addr_type) ||
1181 !(score->ifa->flags & (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC));
1182 break;
1183#ifdef CONFIG_IPV6_MIP6
1184 case IPV6_SADDR_RULE_HOA:
7cbca67c 1185 {
a9b05723 1186 /* Rule 4: Prefer home address */
7cbca67c
YH		 1187 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1188 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
a9b05723 1189 break;
7cbca67c 1190 }
a9b05723
YH		 1191#endif
1192 case IPV6_SADDR_RULE_OIF:
1193 /* Rule 5: Prefer outgoing interface */
1194 ret = (!dst->ifindex ||
1195 dst->ifindex == score->ifa->idev->dev->ifindex);
1196 break;
1197 case IPV6_SADDR_RULE_LABEL:
1198 /* Rule 6: Prefer matching label */
3de23255
BT		 1199 ret = ipv6_addr_label(net,
1200 &score->ifa->addr, score->addr_type,
a9b05723
YH		 1201 score->ifa->idev->dev->ifindex) == dst->label;
1202 break;
1203#ifdef CONFIG_IPV6_PRIVACY
1204 case IPV6_SADDR_RULE_PRIVACY:
7cbca67c 1205 {
a9b05723 1206 /* Rule 7: Prefer public address
25985edc 1207 * Note: prefer temporary address if use_tempaddr >= 2
a9b05723 1208 */
7cbca67c
YH		 1209 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1210 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1211 score->ifa->idev->cnf.use_tempaddr >= 2;
1212 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
a9b05723 1213 break;
7cbca67c 1214 }
a9b05723
YH		 1215#endif
1216 case IPV6_SADDR_RULE_ORCHID:
1217 /* Rule 8-: Prefer ORCHID vs ORCHID or
1218 * non-ORCHID vs non-ORCHID
1219 */
1220 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1221 ipv6_addr_orchid(dst->addr));
1222 break;
1223 case IPV6_SADDR_RULE_PREFIX:
1224 /* Rule 8: Use longest matching prefix */
91b4b04f
YH		 1225 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr);
1226 if (ret > score->ifa->prefix_len)
1227 ret = score->ifa->prefix_len;
1228 score->matchlen = ret;
a9b05723
YH		 1229 break;
1230 default:
1231 ret = 0;
1232 }
1233
1234 if (ret)
1235 __set_bit(i, score->scorebits);
1236 score->rule = i;
1237out:
1238 return ret;
1239}
1240
b3f644fc 1241int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev,
9acd9f3a 1242 const struct in6_addr *daddr, unsigned int prefs,
7cbca67c 1243 struct in6_addr *saddr)
1da177e4 1244{
a9b05723
YH		 1245 struct ipv6_saddr_score scores[2],
1246 *score = &scores[0], *hiscore = &scores[1];
a9b05723 1247 struct ipv6_saddr_dst dst;
072047e4 1248 struct net_device *dev;
a9b05723 1249 int dst_type;
1da177e4 1250
a9b05723
YH		 1251 dst_type = __ipv6_addr_type(daddr);
1252 dst.addr = daddr;
1253 dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1254 dst.scope = __ipv6_addr_src_scope(dst_type);
3de23255 1255 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
7cbca67c 1256 dst.prefs = prefs;
a9b05723
YH		 1257
1258 hiscore->rule = -1;
1259 hiscore->ifa = NULL;
1da177e4 1260
8814c4b5 1261 rcu_read_lock();
1da177e4 1262
c6d14c84 1263 for_each_netdev_rcu(net, dev) {
072047e4 1264 struct inet6_dev *idev;
072047e4 1265
a9b05723 1266 /* Candidate Source Address (section 4)
072047e4
YH		 1267 * - multicast and link-local destination address,
1268 * the set of candidate source address MUST only
1269 * include addresses assigned to interfaces
1270 * belonging to the same link as the outgoing
1271 * interface.
1272 * (- For site-local destination addresses, the
1273 * set of candidate source addresses MUST only
1274 * include addresses assigned to interfaces
1275 * belonging to the same site as the outgoing
1276 * interface.)
1277 */
a9b05723
YH		 1278 if (((dst_type & IPV6_ADDR_MULTICAST) ||
1279 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL) &&
1280 dst.ifindex && dev->ifindex != dst.ifindex)
072047e4 1281 continue;
1da177e4 1282
1da177e4 1283 idev = __in6_dev_get(dev);
072047e4
YH		 1284 if (!idev)
1285 continue;
1286
1287 read_lock_bh(&idev->lock);
502a2ffd 1288 list_for_each_entry(score->ifa, &idev->addr_list, if_list) {
a9b05723 1289 int i;
072047e4 1290
a9b05723 1291 /*
6b3ae80a
YH		 1292 * - Tentative Address (RFC2462 section 5.4)
1293 * - A tentative address is not considered
1294 * "assigned to an interface" in the traditional
95c385b4 1295 * sense, unless it is also flagged as optimistic.
6b3ae80a 1296 * - Candidate Source Address (section 4)
072047e4
YH		 1297 * - In any case, anycast addresses, multicast
1298 * addresses, and the unspecified address MUST
1299 * NOT be included in a candidate set.
1300 */
a9b05723
YH		 1301 if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1302 (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
6b3ae80a 1303 continue;
a9b05723
YH		 1304
1305 score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1306
1307 if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1308 score->addr_type & IPV6_ADDR_MULTICAST)) {
072047e4 1309 LIMIT_NETDEBUG(KERN_DEBUG
3b6d821c 1310 "ADDRCONF: unspecified / multicast address "
072047e4
YH		 1311 "assigned as unicast address on %s",
1312 dev->name);
1313 continue;
1314 }
1315
a9b05723
YH		 1316 score->rule = -1;
1317 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1318
1319 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1320 int minihiscore, miniscore;
1321
3de23255
BT		 1322 minihiscore = ipv6_get_saddr_eval(net, hiscore, &dst, i);
1323 miniscore = ipv6_get_saddr_eval(net, score, &dst, i);
a9b05723
YH		 1324
1325 if (minihiscore > miniscore) {
1326 if (i == IPV6_SADDR_RULE_SCOPE &&
1327 score->scopedist > 0) {
1328 /*
1329 * special case:
1330 * each remaining entry
1331 * has too small (not enough)
1332 * scope, because ifa entries
1333 * are sorted by their scope
1334 * values.
1335 */
1336 goto try_nextdev;
1337 }
1338 break;
1339 } else if (minihiscore < miniscore) {
a9b05723
YH		 1340 if (hiscore->ifa)
1341 in6_ifa_put(hiscore->ifa);
1342
1343 in6_ifa_hold(score->ifa);
1344
a0bffffc 1345 swap(hiscore, score);
a9b05723
YH		 1346
1347 /* restore our iterator */
1348 score->ifa = hiscore->ifa;
1349
1350 break;
1da177e4 1351 }
072047e4 1352 }
1da177e4 1353 }
a9b05723 1354try_nextdev:
072047e4 1355 read_unlock_bh(&idev->lock);
1da177e4 1356 }
8814c4b5 1357 rcu_read_unlock();
1da177e4 1358
a9b05723 1359 if (!hiscore->ifa)
072047e4 1360 return -EADDRNOTAVAIL;
1ab1457c 1361
4e3fd7a0 1362 *saddr = hiscore->ifa->addr;
a9b05723 1363 in6_ifa_put(hiscore->ifa);
072047e4 1364 return 0;
1da177e4 1365}
5e5f3f0f 1366EXPORT_SYMBOL(ipv6_dev_get_saddr);
1da177e4 1367
95c385b4
NH		 1368int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1369 unsigned char banned_flags)
1da177e4
LT		 1370{
1371 struct inet6_dev *idev;
1372 int err = -EADDRNOTAVAIL;
1373
8814c4b5 1374 rcu_read_lock();
e21e8467
SH		 1375 idev = __in6_dev_get(dev);
1376 if (idev) {
1da177e4
LT		 1377 struct inet6_ifaddr *ifp;
1378
1379 read_lock_bh(&idev->lock);
502a2ffd 1380 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1381 if (ifp->scope == IFA_LINK &&
1382 !(ifp->flags & banned_flags)) {
4e3fd7a0 1383 *addr = ifp->addr;
1da177e4
LT		 1384 err = 0;
1385 break;
1386 }
1387 }
1388 read_unlock_bh(&idev->lock);
1389 }
8814c4b5 1390 rcu_read_unlock();
1da177e4
LT		 1391 return err;
1392}
1393
1394static int ipv6_count_addresses(struct inet6_dev *idev)
1395{
1396 int cnt = 0;
1397 struct inet6_ifaddr *ifp;
1398
1399 read_lock_bh(&idev->lock);
502a2ffd 1400 list_for_each_entry(ifp, &idev->addr_list, if_list)
1da177e4
LT		 1401 cnt++;
1402 read_unlock_bh(&idev->lock);
1403 return cnt;
1404}
1405
b71d1d42 1406int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
bfeade08 1407 struct net_device *dev, int strict)
1da177e4 1408{
eedf042a 1409 struct inet6_ifaddr *ifp;
c2e21293 1410 struct hlist_node *node;
ddbe5032 1411 unsigned int hash = inet6_addr_hash(addr);
1da177e4 1412
5c578aed 1413 rcu_read_lock_bh();
1414 hlist_for_each_entry_rcu(ifp, node, &inet6_addr_lst[hash], addr_lst) {
878628fb 1415 if (!net_eq(dev_net(ifp->idev->dev), net))
bfeade08 1416 continue;
1da177e4 1417 if (ipv6_addr_equal(&ifp->addr, addr) &&
eedf042a
SH		 1418 !(ifp->flags&IFA_F_TENTATIVE) &&
1419 (dev == NULL || ifp->idev->dev == dev ||
1420 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) {
1421 rcu_read_unlock_bh();
1422 return 1;
1da177e4
LT		 1423 }
1424 }
5c578aed 1425
eedf042a
SH		 1426 rcu_read_unlock_bh();
1427 return 0;
1da177e4 1428}
7159039a
YH		 1429EXPORT_SYMBOL(ipv6_chk_addr);
1430
3e81c6da
DM		 1431static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1432 struct net_device *dev)
1da177e4 1433{
ddbe5032 1434 unsigned int hash = inet6_addr_hash(addr);
c2e21293 1435 struct inet6_ifaddr *ifp;
1436 struct hlist_node *node;
1da177e4 1437
c2e21293 1438 hlist_for_each_entry(ifp, node, &inet6_addr_lst[hash], addr_lst) {
878628fb 1439 if (!net_eq(dev_net(ifp->idev->dev), net))
06bfe655 1440 continue;
1da177e4
LT		 1441 if (ipv6_addr_equal(&ifp->addr, addr)) {
1442 if (dev == NULL || ifp->idev->dev == dev)
3e81c6da 1443 return true;
1da177e4
LT		 1444 }
1445 }
3e81c6da 1446 return false;
1da177e4
LT		 1447}
1448
b71d1d42 1449int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev)
52eeeb84
YH		 1450{
1451 struct inet6_dev *idev;
1452 struct inet6_ifaddr *ifa;
1453 int onlink;
1454
1455 onlink = 0;
1456 rcu_read_lock();
1457 idev = __in6_dev_get(dev);
1458 if (idev) {
1459 read_lock_bh(&idev->lock);
502a2ffd 1460 list_for_each_entry(ifa, &idev->addr_list, if_list) {
52eeeb84
YH		 1461 onlink = ipv6_prefix_equal(addr, &ifa->addr,
1462 ifa->prefix_len);
1463 if (onlink)
1464 break;
1465 }
1466 read_unlock_bh(&idev->lock);
1467 }
1468 rcu_read_unlock();
1469 return onlink;
1470}
52eeeb84
YH		 1471EXPORT_SYMBOL(ipv6_chk_prefix);
1472
9acd9f3a 1473struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1cab3da6 1474 struct net_device *dev, int strict)
1da177e4 1475{
b79d1d54 1476 struct inet6_ifaddr *ifp, *result = NULL;
ddbe5032 1477 unsigned int hash = inet6_addr_hash(addr);
b79d1d54 1478 struct hlist_node *node;
1da177e4 1479
5c578aed 1480 rcu_read_lock_bh();
4f70ecca 1481 hlist_for_each_entry_rcu_bh(ifp, node, &inet6_addr_lst[hash], addr_lst) {
878628fb 1482 if (!net_eq(dev_net(ifp->idev->dev), net))
1cab3da6 1483 continue;
1da177e4
LT		 1484 if (ipv6_addr_equal(&ifp->addr, addr)) {
1485 if (dev == NULL || ifp->idev->dev == dev ||
1486 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
b79d1d54 1487 result = ifp;
1da177e4
LT		 1488 in6_ifa_hold(ifp);
1489 break;
1490 }
1491 }
1492 }
5c578aed 1493 rcu_read_unlock_bh();
1da177e4 1494
b79d1d54 1495 return result;
1da177e4
LT		 1496}
1497
1da177e4
LT		 1498/* Gets referenced address, destroys ifaddr */
1499
cc411d0b 1500static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
1da177e4 1501{
1da177e4
LT		 1502 if (ifp->flags&IFA_F_PERMANENT) {
1503 spin_lock_bh(&ifp->lock);
1504 addrconf_del_timer(ifp);
1505 ifp->flags |= IFA_F_TENTATIVE;
cc411d0b
BH		 1506 if (dad_failed)
1507 ifp->flags |= IFA_F_DADFAILED;
1da177e4 1508 spin_unlock_bh(&ifp->lock);
e2577a06
HX		 1509 if (dad_failed)
1510 ipv6_ifa_notify(0, ifp);
1da177e4
LT		 1511 in6_ifa_put(ifp);
1512#ifdef CONFIG_IPV6_PRIVACY
1513 } else if (ifp->flags&IFA_F_TEMPORARY) {
1514 struct inet6_ifaddr *ifpub;
1515 spin_lock_bh(&ifp->lock);
1516 ifpub = ifp->ifpub;
1517 if (ifpub) {
1518 in6_ifa_hold(ifpub);
1519 spin_unlock_bh(&ifp->lock);
1520 ipv6_create_tempaddr(ifpub, ifp);
1521 in6_ifa_put(ifpub);
1522 } else {
1523 spin_unlock_bh(&ifp->lock);
1524 }
1525 ipv6_del_addr(ifp);
1526#endif
1527 } else
1528 ipv6_del_addr(ifp);
1529}
1530
f2344a13
HX		 1531static int addrconf_dad_end(struct inet6_ifaddr *ifp)
1532{
1533 int err = -ENOENT;
1534
1535 spin_lock(&ifp->state_lock);
1536 if (ifp->state == INET6_IFADDR_STATE_DAD) {
1537 ifp->state = INET6_IFADDR_STATE_POSTDAD;
1538 err = 0;
1539 }
1540 spin_unlock(&ifp->state_lock);
1541
1542 return err;
1543}
1544
3c21edbd
YH		 1545void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1546{
1b34be74 1547 struct inet6_dev *idev = ifp->idev;
9bdd8d40 1548
853dc2e0
UB		 1549 if (addrconf_dad_end(ifp)) {
1550 in6_ifa_put(ifp);
f2344a13 1551 return;
853dc2e0 1552 }
f2344a13 1553
e87cc472
JP		 1554 net_info_ratelimited("%s: IPv6 duplicate address %pI6c detected!\n",
1555 ifp->idev->dev->name, &ifp->addr);
9bdd8d40 1556
1b34be74
YH		 1557 if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6) {
1558 struct in6_addr addr;
1559
1560 addr.s6_addr32[0] = htonl(0xfe800000);
1561 addr.s6_addr32[1] = 0;
1562
1563 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
1564 ipv6_addr_equal(&ifp->addr, &addr)) {
1565 /* DAD failed for link-local based on MAC address */
1566 idev->cnf.disable_ipv6 = 1;
9bdd8d40 1567
f3213831 1568 pr_info("%s: IPv6 being disabled!\n",
9bdd8d40 1569 ifp->idev->dev->name);
1b34be74
YH		 1570 }
1571 }
1572
cc411d0b 1573 addrconf_dad_stop(ifp, 1);
3c21edbd 1574}
1da177e4
LT		 1575
1576/* Join to solicited addr multicast group. */
1577
b71d1d42 1578void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr)
1da177e4
LT		 1579{
1580 struct in6_addr maddr;
1581
1582 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1583 return;
1584
1585 addrconf_addr_solict_mult(addr, &maddr);
1586 ipv6_dev_mc_inc(dev, &maddr);
1587}
1588
b71d1d42 1589void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr)
1da177e4
LT		 1590{
1591 struct in6_addr maddr;
1592
1593 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1594 return;
1595
1596 addrconf_addr_solict_mult(addr, &maddr);
1597 __ipv6_dev_mc_dec(idev, &maddr);
1598}
1599
20380731 1600static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1da177e4
LT		 1601{
1602 struct in6_addr addr;
2bda8a0c
BM		 1603 if (ifp->prefix_len == 127) /* RFC 6164 */
1604 return;
1da177e4
LT		 1605 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1606 if (ipv6_addr_any(&addr))
1607 return;
1608 ipv6_dev_ac_inc(ifp->idev->dev, &addr);
1609}
1610
20380731 1611static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1da177e4
LT		 1612{
1613 struct in6_addr addr;
32019e65
YH		 1614 if (ifp->prefix_len == 127) /* RFC 6164 */
1615 return;
1da177e4
LT		 1616 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1617 if (ipv6_addr_any(&addr))
1618 return;
1619 __ipv6_dev_ac_dec(ifp->idev, &addr);
1620}
1621
073a8e0e
YH		 1622static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
1623{
1624 if (dev->addr_len != ETH_ALEN)
1625 return -1;
1626 memcpy(eui, dev->dev_addr, 3);
1627 memcpy(eui + 5, dev->dev_addr + 3, 3);
1628
1629 /*
1630 * The zSeries OSA network cards can be shared among various
1631 * OS instances, but the OSA cards have only one MAC address.
1632 * This leads to duplicate address conflicts in conjunction
1633 * with IPv6 if more than one instance uses the same card.
1634 *
1635 * The driver for these cards can deliver a unique 16-bit
1636 * identifier for each instance sharing the same card. It is
1637 * placed instead of 0xFFFE in the interface identifier. The
1638 * "u" bit of the interface identifier is not inverted in this
1639 * case. Hence the resulting interface identifier has local
1640 * scope according to RFC2373.
1641 */
1642 if (dev->dev_id) {
1643 eui[3] = (dev->dev_id >> 8) & 0xFF;
1644 eui[4] = dev->dev_id & 0xFF;
1645 } else {
1646 eui[3] = 0xFF;
1647 eui[4] = 0xFE;
1648 eui[0] ^= 2;
1649 }
1650 return 0;
1651}
1652
06a4c1c5 1653static int addrconf_ifid_eui64(u8 *eui, struct net_device *dev)
1654{
1655 if (dev->addr_len != IEEE802154_ADDR_LEN)
1656 return -1;
1657 memcpy(eui, dev->dev_addr, 8);
1658 return 0;
1659}
1660
073a8e0e
YH		 1661static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1662{
1663 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1664 if (dev->addr_len != ARCNET_ALEN)
1665 return -1;
1666 memset(eui, 0, 7);
8e5e8f30 1667 eui[7] = *(u8 *)dev->dev_addr;
073a8e0e
YH		 1668 return 0;
1669}
1670
1671static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1672{
1673 if (dev->addr_len != INFINIBAND_ALEN)
1674 return -1;
1675 memcpy(eui, dev->dev_addr + 12, 8);
1676 eui[0] |= 2;
1677 return 0;
1678}
1679
c61393ea 1680static int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
dfd982ba 1681{
9af28511
SH		 1682 if (addr == 0)
1683 return -1;
dfd982ba
YH		 1684 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
1685 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
1686 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
1687 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
1688 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
1689 ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
1690 eui[1] = 0;
1691 eui[2] = 0x5E;
1692 eui[3] = 0xFE;
1693 memcpy(eui + 4, &addr, 4);
1694 return 0;
1695}
dfd982ba
YH		 1696
1697static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
1698{
1699 if (dev->priv_flags & IFF_ISATAP)
1700 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1701 return -1;
1702}
1703
aee80b54 1704static int addrconf_ifid_gre(u8 *eui, struct net_device *dev)
1705{
1706 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1707}
1708
1da177e4
LT		 1709static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1710{
1711 switch (dev->type) {
1712 case ARPHRD_ETHER:
1713 case ARPHRD_FDDI:
073a8e0e 1714 return addrconf_ifid_eui48(eui, dev);
1da177e4 1715 case ARPHRD_ARCNET:
073a8e0e 1716 return addrconf_ifid_arcnet(eui, dev);
1da177e4 1717 case ARPHRD_INFINIBAND:
073a8e0e 1718 return addrconf_ifid_infiniband(eui, dev);
c7dc89c0 1719 case ARPHRD_SIT:
dfd982ba 1720 return addrconf_ifid_sit(eui, dev);
aee80b54 1721 case ARPHRD_IPGRE:
1722 return addrconf_ifid_gre(eui, dev);
06a4c1c5 1723 case ARPHRD_IEEE802154:
1724 return addrconf_ifid_eui64(eui, dev);
1da177e4
LT		 1725 }
1726 return -1;
1727}
1728
1729static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1730{
1731 int err = -1;
1732 struct inet6_ifaddr *ifp;
1733
1734 read_lock_bh(&idev->lock);
502a2ffd 1735 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1da177e4
LT		 1736 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1737 memcpy(eui, ifp->addr.s6_addr+8, 8);
1738 err = 0;
1739 break;
1740 }
1741 }
1742 read_unlock_bh(&idev->lock);
1743 return err;
1744}
1745
1746#ifdef CONFIG_IPV6_PRIVACY
1747/* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
eb7e0575 1748static void __ipv6_regen_rndid(struct inet6_dev *idev)
1da177e4 1749{
1da177e4 1750regen:
955189ef 1751 get_random_bytes(idev->rndid, sizeof(idev->rndid));
1da177e4 1752 idev->rndid[0] &= ~0x02;
1da177e4
LT		 1753
1754 /*
1755 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1756 * check if generated address is not inappropriate
1757 *
1758 * - Reserved subnet anycast (RFC 2526)
1759 * 11111101 11....11 1xxxxxxx
c7dc89c0 1760 * - ISATAP (RFC4214) 6.1
1da177e4
LT		 1761 * 00-00-5E-FE-xx-xx-xx-xx
1762 * - value 0
1763 * - XXX: already assigned to an address on the device
1764 */
1ab1457c 1765 if (idev->rndid[0] == 0xfd &&
1da177e4
LT		 1766 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1767 (idev->rndid[7]&0x80))
1768 goto regen;
1769 if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1770 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1771 goto regen;
1772 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1773 goto regen;
1774 }
1da177e4
LT		 1775}
1776
1777static void ipv6_regen_rndid(unsigned long data)
1778{
1779 struct inet6_dev *idev = (struct inet6_dev *) data;
1780 unsigned long expires;
1781
8814c4b5 1782 rcu_read_lock_bh();
1da177e4
LT		 1783 write_lock_bh(&idev->lock);
1784
1785 if (idev->dead)
1786 goto out;
1787
eb7e0575 1788 __ipv6_regen_rndid(idev);
1ab1457c 1789
1da177e4 1790 expires = jiffies +
1ab1457c 1791 idev->cnf.temp_prefered_lft * HZ -
784e2710
BH		 1792 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time -
1793 idev->cnf.max_desync_factor * HZ;
1da177e4 1794 if (time_before(expires, jiffies)) {
f3213831
JP		 1795 pr_warn("%s: too short regeneration interval; timer disabled for %s\n",
1796 __func__, idev->dev->name);
1da177e4
LT		 1797 goto out;
1798 }
1799
1800 if (!mod_timer(&idev->regen_timer, expires))
1801 in6_dev_hold(idev);
1802
1803out:
1804 write_unlock_bh(&idev->lock);
8814c4b5 1805 rcu_read_unlock_bh();
1da177e4
LT		 1806 in6_dev_put(idev);
1807}
1808
eb7e0575 1809static void __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr)
8e5e8f30 1810{
1da177e4 1811 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
eb7e0575 1812 __ipv6_regen_rndid(idev);
1da177e4
LT		 1813}
1814#endif
1815
1816/*
1817 * Add prefix route.
1818 */
1819
1820static void
1821addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
e431b8c0 1822 unsigned long expires, u32 flags)
1da177e4 1823{
86872cb5
TG		 1824 struct fib6_config cfg = {
1825 .fc_table = RT6_TABLE_PREFIX,
1826 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1827 .fc_ifindex = dev->ifindex,
1828 .fc_expires = expires,
1829 .fc_dst_len = plen,
1830 .fc_flags = RTF_UP | flags,
c346dca1 1831 .fc_nlinfo.nl_net = dev_net(dev),
f410a1fb 1832 .fc_protocol = RTPROT_KERNEL,
86872cb5 1833 };
1da177e4 1834
4e3fd7a0 1835 cfg.fc_dst = *pfx;
1da177e4
LT		 1836
1837 /* Prevent useless cloning on PtP SIT.
1838 This thing is done here expecting that the whole
1839 class of non-broadcast devices need not cloning.
1840 */
07a93626 1841#if IS_ENABLED(CONFIG_IPV6_SIT)
86872cb5
TG		 1842 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
1843 cfg.fc_flags |= RTF_NONEXTHOP;
0be669bb 1844#endif
1da177e4 1845
86872cb5 1846 ip6_route_add(&cfg);
1da177e4
LT		 1847}
1848
14ef37b6
AH		 1849
1850static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
1851 int plen,
1852 const struct net_device *dev,
1853 u32 flags, u32 noflags)
1854{
1855 struct fib6_node *fn;
1856 struct rt6_info *rt = NULL;
1857 struct fib6_table *table;
1858
1859 table = fib6_get_table(dev_net(dev), RT6_TABLE_PREFIX);
1860 if (table == NULL)
1861 return NULL;
1862
5744dd9b 1863 read_lock_bh(&table->tb6_lock);
14ef37b6
AH		 1864 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0);
1865 if (!fn)
1866 goto out;
1867 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
d1918542 1868 if (rt->dst.dev->ifindex != dev->ifindex)
14ef37b6
AH		 1869 continue;
1870 if ((rt->rt6i_flags & flags) != flags)
1871 continue;
1872 if ((noflags != 0) && ((rt->rt6i_flags & flags) != 0))
1873 continue;
1874 dst_hold(&rt->dst);
1875 break;
1876 }
1877out:
5744dd9b 1878 read_unlock_bh(&table->tb6_lock);
14ef37b6
AH		 1879 return rt;
1880}
1881
1882
1da177e4
LT		 1883/* Create "default" multicast route to the interface */
1884
1885static void addrconf_add_mroute(struct net_device *dev)
1886{
86872cb5
TG		 1887 struct fib6_config cfg = {
1888 .fc_table = RT6_TABLE_LOCAL,
1889 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1890 .fc_ifindex = dev->ifindex,
1891 .fc_dst_len = 8,
1892 .fc_flags = RTF_UP,
c346dca1 1893 .fc_nlinfo.nl_net = dev_net(dev),
86872cb5
TG		 1894 };
1895
1896 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
1897
1898 ip6_route_add(&cfg);
1da177e4
LT		 1899}
1900
07a93626 1901#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4
LT		 1902static void sit_route_add(struct net_device *dev)
1903{
86872cb5
TG		 1904 struct fib6_config cfg = {
1905 .fc_table = RT6_TABLE_MAIN,
1906 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1907 .fc_ifindex = dev->ifindex,
1908 .fc_dst_len = 96,
1909 .fc_flags = RTF_UP | RTF_NONEXTHOP,
c346dca1 1910 .fc_nlinfo.nl_net = dev_net(dev),
86872cb5 1911 };
1da177e4
LT		 1912
1913 /* prefix length - 96 bits "::d.d.d.d" */
86872cb5 1914 ip6_route_add(&cfg);
1da177e4 1915}
0be669bb 1916#endif
1da177e4 1917
1da177e4
LT		 1918static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
1919{
1920 struct inet6_dev *idev;
1921
1922 ASSERT_RTNL();
1923
e21e8467
SH		 1924 idev = ipv6_find_idev(dev);
1925 if (!idev)
64e724f6
BH		 1926 return ERR_PTR(-ENOBUFS);
1927
1928 if (idev->cnf.disable_ipv6)
1929 return ERR_PTR(-EACCES);
1da177e4
LT		 1930
1931 /* Add default multicast route */
4af04aba
LW		 1932 if (!(dev->flags & IFF_LOOPBACK))
1933 addrconf_add_mroute(dev);
1da177e4 1934
1da177e4
LT		 1935 return idev;
1936}
1937
e6bff995 1938void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao)
1da177e4
LT		 1939{
1940 struct prefix_info *pinfo;
1941 __u32 valid_lft;
1942 __u32 prefered_lft;
1943 int addr_type;
1da177e4 1944 struct inet6_dev *in6_dev;
56d417b1 1945 struct net *net = dev_net(dev);
1da177e4
LT		 1946
1947 pinfo = (struct prefix_info *) opt;
1ab1457c 1948
1da177e4
LT		 1949 if (len < sizeof(struct prefix_info)) {
1950 ADBG(("addrconf: prefix option too short\n"));
1951 return;
1952 }
1ab1457c 1953
1da177e4
LT		 1954 /*
1955 * Validation checks ([ADDRCONF], page 19)
1956 */
1957
1958 addr_type = ipv6_addr_type(&pinfo->prefix);
1959
1960 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
1961 return;
1962
1963 valid_lft = ntohl(pinfo->valid);
1964 prefered_lft = ntohl(pinfo->prefered);
1965
1966 if (prefered_lft > valid_lft) {
e87cc472 1967 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n");
1da177e4
LT		 1968 return;
1969 }
1970
1971 in6_dev = in6_dev_get(dev);
1972
1973 if (in6_dev == NULL) {
e87cc472
JP		 1974 net_dbg_ratelimited("addrconf: device %s not configured\n",
1975 dev->name);
1da177e4
LT		 1976 return;
1977 }
1978
1979 /*
1980 * Two things going on here:
1981 * 1) Add routes for on-link prefixes
1982 * 2) Configure prefixes with the auto flag set
1983 */
1984
4bed72e4
YH		 1985 if (pinfo->onlink) {
1986 struct rt6_info *rt;
1987 unsigned long rt_expires;
1988
6f704992
YH		 1989 /* Avoid arithmetic overflow. Really, we could
1990 * save rt_expires in seconds, likely valid_lft,
1991 * but it would require division in fib gc, that it
1992 * not good.
1993 */
4bed72e4
YH		 1994 if (HZ > USER_HZ)
1995 rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
1996 else
1997 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
3dd4bc68 1998
4bed72e4
YH		 1999 if (addrconf_finite_timeout(rt_expires))
2000 rt_expires *= HZ;
1da177e4 2001
14ef37b6
AH		 2002 rt = addrconf_get_prefix_route(&pinfo->prefix,
2003 pinfo->prefix_len,
2004 dev,
2005 RTF_ADDRCONF | RTF_PREFIX_RT,
2006 RTF_GATEWAY | RTF_DEFAULT);
1da177e4 2007
14ef37b6 2008 if (rt) {
6f704992
YH		 2009 /* Autoconf prefix route */
2010 if (valid_lft == 0) {
2011 ip6_del_rt(rt);
2012 rt = NULL;
4bed72e4 2013 } else if (addrconf_finite_timeout(rt_expires)) {
6f704992 2014 /* not infinity */
1716a961 2015 rt6_set_expires(rt, jiffies + rt_expires);
6f704992 2016 } else {
1716a961 2017 rt6_clean_expires(rt);
1da177e4
LT		 2018 }
2019 } else if (valid_lft) {
6f704992 2020 clock_t expires = 0;
4bed72e4
YH		 2021 int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
2022 if (addrconf_finite_timeout(rt_expires)) {
6f704992
YH		 2023 /* not infinity */
2024 flags |= RTF_EXPIRES;
2025 expires = jiffies_to_clock_t(rt_expires);
2026 }
1da177e4 2027 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
6f704992 2028 dev, expires, flags);
1da177e4 2029 }
94e187c0 2030 ip6_rt_put(rt);
1da177e4
LT		 2031 }
2032
2033 /* Try to figure out our local address for this prefix */
2034
2035 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
8e5e8f30 2036 struct inet6_ifaddr *ifp;
1da177e4
LT		 2037 struct in6_addr addr;
2038 int create = 0, update_lft = 0;
2039
2040 if (pinfo->prefix_len == 64) {
2041 memcpy(&addr, &pinfo->prefix, 8);
2042 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
2043 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
2044 in6_dev_put(in6_dev);
2045 return;
2046 }
2047 goto ok;
2048 }
e87cc472
JP		 2049 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n",
2050 pinfo->prefix_len);
1da177e4
LT		 2051 in6_dev_put(in6_dev);
2052 return;
2053
2054ok:
2055
53b7997f 2056 ifp = ipv6_get_ifaddr(net, &addr, dev, 1);
1da177e4
LT		 2057
2058 if (ifp == NULL && valid_lft) {
2059 int max_addresses = in6_dev->cnf.max_addresses;
95c385b4
NH		 2060 u32 addr_flags = 0;
2061
2062#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2063 if (in6_dev->cnf.optimistic_dad &&
e6bff995 2064 !net->ipv6.devconf_all->forwarding && sllao)
95c385b4
NH		 2065 addr_flags = IFA_F_OPTIMISTIC;
2066#endif
1da177e4
LT		 2067
2068 /* Do not allow to create too much of autoconfigured
2069 * addresses; this would be too easy way to crash kernel.
2070 */
2071 if (!max_addresses ||
2072 ipv6_count_addresses(in6_dev) < max_addresses)
2073 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len,
95c385b4
NH		 2074 addr_type&IPV6_ADDR_SCOPE_MASK,
2075 addr_flags);
1da177e4
LT		 2076
2077 if (!ifp || IS_ERR(ifp)) {
2078 in6_dev_put(in6_dev);
2079 return;
2080 }
2081
2082 update_lft = create = 1;
2083 ifp->cstamp = jiffies;
cf22f9a2 2084 addrconf_dad_start(ifp);
1da177e4
LT		 2085 }
2086
2087 if (ifp) {
2088 int flags;
2089 unsigned long now;
2090#ifdef CONFIG_IPV6_PRIVACY
2091 struct inet6_ifaddr *ift;
2092#endif
2093 u32 stored_lft;
2094
2095 /* update lifetime (RFC2462 5.5.3 e) */
2096 spin_lock(&ifp->lock);
2097 now = jiffies;
2098 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
2099 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
2100 else
2101 stored_lft = 0;
2102 if (!update_lft && stored_lft) {
2103 if (valid_lft > MIN_VALID_LIFETIME ||
2104 valid_lft > stored_lft)
2105 update_lft = 1;
2106 else if (stored_lft <= MIN_VALID_LIFETIME) {
2107 /* valid_lft <= stored_lft is always true */
a1ed0526
BH		 2108 /*
2109 * RFC 4862 Section 5.5.3e:
2110 * "Note that the preferred lifetime of
2111 * the corresponding address is always
2112 * reset to the Preferred Lifetime in
2113 * the received Prefix Information
2114 * option, regardless of whether the
2115 * valid lifetime is also reset or
2116 * ignored."
2117 *
2118 * So if the preferred lifetime in
2119 * this advertisement is different
2120 * than what we have stored, but the
2121 * valid lifetime is invalid, just
2122 * reset prefered_lft.
2123 *
2124 * We must set the valid lifetime
2125 * to the stored lifetime since we'll
2126 * be updating the timestamp below,
2127 * else we'll set it back to the
25985edc 2128 * minimum.
a1ed0526
BH		 2129 */
2130 if (prefered_lft != ifp->prefered_lft) {
2131 valid_lft = stored_lft;
2132 update_lft = 1;
2133 }
1da177e4
LT		 2134 } else {
2135 valid_lft = MIN_VALID_LIFETIME;
2136 if (valid_lft < prefered_lft)
2137 prefered_lft = valid_lft;
2138 update_lft = 1;
2139 }
2140 }
2141
2142 if (update_lft) {
2143 ifp->valid_lft = valid_lft;
2144 ifp->prefered_lft = prefered_lft;
2145 ifp->tstamp = now;
2146 flags = ifp->flags;
2147 ifp->flags &= ~IFA_F_DEPRECATED;
2148 spin_unlock(&ifp->lock);
2149
2150 if (!(flags&IFA_F_TENTATIVE))
2151 ipv6_ifa_notify(0, ifp);
2152 } else
2153 spin_unlock(&ifp->lock);
2154
2155#ifdef CONFIG_IPV6_PRIVACY
2156 read_lock_bh(&in6_dev->lock);
2157 /* update all temporary addresses in the list */
76f793e3
LC		 2158 list_for_each_entry(ift, &in6_dev->tempaddr_list,
2159 tmp_list) {
2160 int age, max_valid, max_prefered;
2161
c6fbfac2
BB		 2162 if (ifp != ift->ifpub)
2163 continue;
2164
76f793e3
LC		 2165 /*
2166 * RFC 4941 section 3.3:
2167 * If a received option will extend the lifetime
2168 * of a public address, the lifetimes of
2169 * temporary addresses should be extended,
2170 * subject to the overall constraint that no
2171 * temporary addresses should ever remain
2172 * "valid" or "preferred" for a time longer than
2173 * (TEMP_VALID_LIFETIME) or
2174 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR),
2175 * respectively.
2176 */
2177 age = (now - ift->cstamp) / HZ;
2178 max_valid = in6_dev->cnf.temp_valid_lft - age;
2179 if (max_valid < 0)
2180 max_valid = 0;
2181
2182 max_prefered = in6_dev->cnf.temp_prefered_lft -
2183 in6_dev->cnf.max_desync_factor -
2184 age;
2185 if (max_prefered < 0)
2186 max_prefered = 0;
2187
2188 if (valid_lft > max_valid)
2189 valid_lft = max_valid;
2190
2191 if (prefered_lft > max_prefered)
2192 prefered_lft = max_prefered;
2193
1da177e4
LT		 2194 spin_lock(&ift->lock);
2195 flags = ift->flags;
76f793e3
LC		 2196 ift->valid_lft = valid_lft;
2197 ift->prefered_lft = prefered_lft;
2198 ift->tstamp = now;
2199 if (prefered_lft > 0)
2200 ift->flags &= ~IFA_F_DEPRECATED;
2201
1da177e4
LT		 2202 spin_unlock(&ift->lock);
2203 if (!(flags&IFA_F_TENTATIVE))
2204 ipv6_ifa_notify(0, ift);
2205 }
2206
aed65501 2207 if ((create || list_empty(&in6_dev->tempaddr_list)) && in6_dev->cnf.use_tempaddr > 0) {
1da177e4 2208 /*
76f793e3
LC		 2209 * When a new public address is created as
2210 * described in [ADDRCONF], also create a new
2211 * temporary address. Also create a temporary
2212 * address if it's enabled but no temporary
2213 * address currently exists.
1da177e4 2214 */
1ab1457c 2215 read_unlock_bh(&in6_dev->lock);
1da177e4
LT		 2216 ipv6_create_tempaddr(ifp, NULL);
2217 } else {
2218 read_unlock_bh(&in6_dev->lock);
2219 }
2220#endif
2221 in6_ifa_put(ifp);
2222 addrconf_verify(0);
2223 }
2224 }
2225 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
2226 in6_dev_put(in6_dev);
2227}
2228
2229/*
2230 * Set destination address.
2231 * Special case for SIT interfaces where we create a new "virtual"
2232 * device.
2233 */
af284937 2234int addrconf_set_dstaddr(struct net *net, void __user *arg)
1da177e4
LT		 2235{
2236 struct in6_ifreq ireq;
2237 struct net_device *dev;
2238 int err = -EINVAL;
2239
2240 rtnl_lock();
2241
2242 err = -EFAULT;
2243 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2244 goto err_exit;
2245
af284937 2246 dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
1da177e4
LT		 2247
2248 err = -ENODEV;
2249 if (dev == NULL)
2250 goto err_exit;
2251
07a93626 2252#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4 2253 if (dev->type == ARPHRD_SIT) {
5bc3eb7e 2254 const struct net_device_ops *ops = dev->netdev_ops;
1da177e4 2255 struct ifreq ifr;
1da177e4
LT		 2256 struct ip_tunnel_parm p;
2257
2258 err = -EADDRNOTAVAIL;
2259 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2260 goto err_exit;
2261
2262 memset(&p, 0, sizeof(p));
2263 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2264 p.iph.saddr = 0;
2265 p.iph.version = 4;
2266 p.iph.ihl = 5;
2267 p.iph.protocol = IPPROTO_IPV6;
2268 p.iph.ttl = 64;
d20b3109 2269 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
1da177e4 2270
5bc3eb7e
SH		 2271 if (ops->ndo_do_ioctl) {
2272 mm_segment_t oldfs = get_fs();
2273
2274 set_fs(KERNEL_DS);
2275 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2276 set_fs(oldfs);
2277 } else
2278 err = -EOPNOTSUPP;
1da177e4
LT		 2279
2280 if (err == 0) {
2281 err = -ENOBUFS;
af284937
DL		 2282 dev = __dev_get_by_name(net, p.name);
2283 if (!dev)
1da177e4
LT		 2284 goto err_exit;
2285 err = dev_open(dev);
2286 }
2287 }
0be669bb 2288#endif
1da177e4
LT		 2289
2290err_exit:
2291 rtnl_unlock();
2292 return err;
2293}
2294
2295/*
2296 * Manual configuration of address on an interface
2297 */
b71d1d42 2298static int inet6_addr_add(struct net *net, int ifindex, const struct in6_addr *pfx,
24ef0da7 2299 unsigned int plen, __u8 ifa_flags, __u32 prefered_lft,
af284937 2300 __u32 valid_lft)
1da177e4
LT		 2301{
2302 struct inet6_ifaddr *ifp;
2303 struct inet6_dev *idev;
2304 struct net_device *dev;
2305 int scope;
6f704992
YH		 2306 u32 flags;
2307 clock_t expires;
4bed72e4 2308 unsigned long timeout;
1da177e4
LT		 2309
2310 ASSERT_RTNL();
1ab1457c 2311
24ef0da7
TG		 2312 if (plen > 128)
2313 return -EINVAL;
2314
0778769d
NT		 2315 /* check the lifetime */
2316 if (!valid_lft || prefered_lft > valid_lft)
2317 return -EINVAL;
2318
af284937
DL		 2319 dev = __dev_get_by_index(net, ifindex);
2320 if (!dev)
1da177e4 2321 return -ENODEV;
1ab1457c 2322
64e724f6
BH		 2323 idev = addrconf_add_dev(dev);
2324 if (IS_ERR(idev))
2325 return PTR_ERR(idev);
1da177e4
LT		 2326
2327 scope = ipv6_addr_scope(pfx);
2328
4bed72e4
YH		 2329 timeout = addrconf_timeout_fixup(valid_lft, HZ);
2330 if (addrconf_finite_timeout(timeout)) {
2331 expires = jiffies_to_clock_t(timeout * HZ);
2332 valid_lft = timeout;
6f704992 2333 flags = RTF_EXPIRES;
4bed72e4
YH		 2334 } else {
2335 expires = 0;
2336 flags = 0;
2337 ifa_flags |= IFA_F_PERMANENT;
6f704992 2338 }
0778769d 2339
4bed72e4
YH		 2340 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
2341 if (addrconf_finite_timeout(timeout)) {
2342 if (timeout == 0)
2343 ifa_flags |= IFA_F_DEPRECATED;
2344 prefered_lft = timeout;
2345 }
0778769d
NT		 2346
2347 ifp = ipv6_add_addr(idev, pfx, plen, scope, ifa_flags);
2348
1da177e4 2349 if (!IS_ERR(ifp)) {
06aebfb7 2350 spin_lock_bh(&ifp->lock);
0778769d
NT		 2351 ifp->valid_lft = valid_lft;
2352 ifp->prefered_lft = prefered_lft;
2353 ifp->tstamp = jiffies;
06aebfb7 2354 spin_unlock_bh(&ifp->lock);
0778769d 2355
46d48046 2356 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
6f704992 2357 expires, flags);
95c385b4
NH		 2358 /*
2359 * Note that section 3.1 of RFC 4429 indicates
2360 * that the Optimistic flag should not be set for
2361 * manually configured addresses
2362 */
cf22f9a2 2363 addrconf_dad_start(ifp);
1da177e4 2364 in6_ifa_put(ifp);
0778769d 2365 addrconf_verify(0);
1da177e4
LT		 2366 return 0;
2367 }
2368
2369 return PTR_ERR(ifp);
2370}
2371
b71d1d42 2372static int inet6_addr_del(struct net *net, int ifindex, const struct in6_addr *pfx,
24ef0da7 2373 unsigned int plen)
1da177e4
LT		 2374{
2375 struct inet6_ifaddr *ifp;
2376 struct inet6_dev *idev;
2377 struct net_device *dev;
1ab1457c 2378
24ef0da7
TG		 2379 if (plen > 128)
2380 return -EINVAL;
2381
af284937
DL		 2382 dev = __dev_get_by_index(net, ifindex);
2383 if (!dev)
1da177e4
LT		 2384 return -ENODEV;
2385
2386 if ((idev = __in6_dev_get(dev)) == NULL)
2387 return -ENXIO;
2388
2389 read_lock_bh(&idev->lock);
502a2ffd 2390 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1da177e4
LT		 2391 if (ifp->prefix_len == plen &&
2392 ipv6_addr_equal(pfx, &ifp->addr)) {
2393 in6_ifa_hold(ifp);
2394 read_unlock_bh(&idev->lock);
1ab1457c 2395
1da177e4
LT		 2396 ipv6_del_addr(ifp);
2397
2398 /* If the last address is deleted administratively,
2399 disable IPv6 on this interface.
2400 */
502a2ffd 2401 if (list_empty(&idev->addr_list))
1da177e4
LT		 2402 addrconf_ifdown(idev->dev, 1);
2403 return 0;
2404 }
2405 }
2406 read_unlock_bh(&idev->lock);
2407 return -EADDRNOTAVAIL;
2408}
2409
2410
af284937 2411int addrconf_add_ifaddr(struct net *net, void __user *arg)
1da177e4
LT		 2412{
2413 struct in6_ifreq ireq;
2414 int err;
1ab1457c 2415
af31f412 2416 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1da177e4 2417 return -EPERM;
1ab1457c 2418
1da177e4
LT		 2419 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2420 return -EFAULT;
2421
2422 rtnl_lock();
af284937
DL		 2423 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2424 ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2425 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
1da177e4
LT		 2426 rtnl_unlock();
2427 return err;
2428}
2429
af284937 2430int addrconf_del_ifaddr(struct net *net, void __user *arg)
1da177e4
LT		 2431{
2432 struct in6_ifreq ireq;
2433 int err;
1ab1457c 2434
af31f412 2435 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1da177e4
LT		 2436 return -EPERM;
2437
2438 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2439 return -EFAULT;
2440
2441 rtnl_lock();
af284937
DL		 2442 err = inet6_addr_del(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2443 ireq.ifr6_prefixlen);
1da177e4
LT		 2444 rtnl_unlock();
2445 return err;
2446}
2447
b5f348e5
IJ		 2448static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
2449 int plen, int scope)
2450{
2451 struct inet6_ifaddr *ifp;
2452
2453 ifp = ipv6_add_addr(idev, addr, plen, scope, IFA_F_PERMANENT);
2454 if (!IS_ERR(ifp)) {
2455 spin_lock_bh(&ifp->lock);
2456 ifp->flags &= ~IFA_F_TENTATIVE;
2457 spin_unlock_bh(&ifp->lock);
2458 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2459 in6_ifa_put(ifp);
2460 }
2461}
2462
07a93626 2463#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4
LT		 2464static void sit_add_v4_addrs(struct inet6_dev *idev)
2465{
1da177e4
LT		 2466 struct in6_addr addr;
2467 struct net_device *dev;
c346dca1 2468 struct net *net = dev_net(idev->dev);
1da177e4
LT		 2469 int scope;
2470
2471 ASSERT_RTNL();
2472
2473 memset(&addr, 0, sizeof(struct in6_addr));
2474 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2475
2476 if (idev->dev->flags&IFF_POINTOPOINT) {
2477 addr.s6_addr32[0] = htonl(0xfe800000);
2478 scope = IFA_LINK;
2479 } else {
2480 scope = IPV6_ADDR_COMPATv4;
2481 }
2482
2483 if (addr.s6_addr32[3]) {
b5f348e5 2484 add_addr(idev, &addr, 128, scope);
1da177e4
LT		 2485 return;
2486 }
2487
6fda7350 2488 for_each_netdev(net, dev) {
8e5e8f30 2489 struct in_device *in_dev = __in_dev_get_rtnl(dev);
1da177e4 2490 if (in_dev && (dev->flags & IFF_UP)) {
8e5e8f30 2491 struct in_ifaddr *ifa;
1da177e4
LT		 2492
2493 int flag = scope;
2494
2495 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2496 int plen;
2497
2498 addr.s6_addr32[3] = ifa->ifa_local;
2499
2500 if (ifa->ifa_scope == RT_SCOPE_LINK)
2501 continue;
2502 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2503 if (idev->dev->flags&IFF_POINTOPOINT)
2504 continue;
2505 flag |= IFA_HOST;
2506 }
2507 if (idev->dev->flags&IFF_POINTOPOINT)
2508 plen = 64;
2509 else
2510 plen = 96;
2511
b5f348e5 2512 add_addr(idev, &addr, plen, flag);
1da177e4
LT		 2513 }
2514 }
1ab1457c 2515 }
1da177e4 2516}
0be669bb 2517#endif
1da177e4
LT		 2518
2519static void init_loopback(struct net_device *dev)
2520{
2521 struct inet6_dev *idev;
1da177e4
LT		 2522
2523 /* ::1 */
2524
2525 ASSERT_RTNL();
2526
2527 if ((idev = ipv6_find_idev(dev)) == NULL) {
91df42be 2528 pr_debug("%s: add_dev failed\n", __func__);
1da177e4
LT		 2529 return;
2530 }
2531
b5f348e5 2532 add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
1da177e4
LT		 2533}
2534
b71d1d42 2535static void addrconf_add_linklocal(struct inet6_dev *idev, const struct in6_addr *addr)
1da177e4 2536{
8e5e8f30 2537 struct inet6_ifaddr *ifp;
95c385b4
NH		 2538 u32 addr_flags = IFA_F_PERMANENT;
2539
2540#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2541 if (idev->cnf.optimistic_dad &&
702beb87 2542 !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
95c385b4
NH		 2543 addr_flags |= IFA_F_OPTIMISTIC;
2544#endif
1da177e4 2545
95c385b4
NH		 2546
2547 ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, addr_flags);
1da177e4 2548 if (!IS_ERR(ifp)) {
46d48046 2549 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
cf22f9a2 2550 addrconf_dad_start(ifp);
1da177e4
LT		 2551 in6_ifa_put(ifp);
2552 }
2553}
2554
2555static void addrconf_dev_config(struct net_device *dev)
2556{
2557 struct in6_addr addr;
8e5e8f30 2558 struct inet6_dev *idev;
1da177e4
LT		 2559
2560 ASSERT_RTNL();
2561
74235a25
HX		 2562 if ((dev->type != ARPHRD_ETHER) &&
2563 (dev->type != ARPHRD_FDDI) &&
74235a25 2564 (dev->type != ARPHRD_ARCNET) &&
06a4c1c5 2565 (dev->type != ARPHRD_INFINIBAND) &&
2566 (dev->type != ARPHRD_IEEE802154)) {
74235a25
HX		 2567 /* Alas, we support only Ethernet autoconfiguration. */
2568 return;
2569 }
2570
1da177e4 2571 idev = addrconf_add_dev(dev);
64e724f6 2572 if (IS_ERR(idev))
1da177e4
LT		 2573 return;
2574
2575 memset(&addr, 0, sizeof(struct in6_addr));
2576 addr.s6_addr32[0] = htonl(0xFE800000);
2577
2578 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
2579 addrconf_add_linklocal(idev, &addr);
2580}
2581
07a93626 2582#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4
LT		 2583static void addrconf_sit_config(struct net_device *dev)
2584{
2585 struct inet6_dev *idev;
2586
2587 ASSERT_RTNL();
2588
1ab1457c
YH		 2589 /*
2590 * Configure the tunnel with one of our IPv4
2591 * addresses... we should configure all of
1da177e4
LT		 2592 * our v4 addrs in the tunnel
2593 */
2594
2595 if ((idev = ipv6_find_idev(dev)) == NULL) {
91df42be 2596 pr_debug("%s: add_dev failed\n", __func__);
1da177e4
LT		 2597 return;
2598 }
2599
c7dc89c0
FT		 2600 if (dev->priv_flags & IFF_ISATAP) {
2601 struct in6_addr addr;
2602
2603 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
2604 addrconf_prefix_route(&addr, 64, dev, 0, 0);
2605 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2606 addrconf_add_linklocal(idev, &addr);
2607 return;
2608 }
2609
1da177e4
LT		 2610 sit_add_v4_addrs(idev);
2611
62b54dd9 2612 if (dev->flags&IFF_POINTOPOINT)
1da177e4 2613 addrconf_add_mroute(dev);
62b54dd9 2614 else
1da177e4
LT		 2615 sit_route_add(dev);
2616}
0be669bb 2617#endif
1da177e4 2618
07a93626 2619#if IS_ENABLED(CONFIG_NET_IPGRE)
aee80b54 2620static void addrconf_gre_config(struct net_device *dev)
2621{
2622 struct inet6_dev *idev;
2623 struct in6_addr addr;
2624
f3213831 2625 pr_info("%s(%s)\n", __func__, dev->name);
aee80b54 2626
2627 ASSERT_RTNL();
2628
2629 if ((idev = ipv6_find_idev(dev)) == NULL) {
91df42be 2630 pr_debug("%s: add_dev failed\n", __func__);
aee80b54 2631 return;
2632 }
2633
2634 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
2635 addrconf_prefix_route(&addr, 64, dev, 0, 0);
2636
2637 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2638 addrconf_add_linklocal(idev, &addr);
2639}
2640#endif
2641
1da177e4
LT		 2642static inline int
2643ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev)
2644{
2645 struct in6_addr lladdr;
2646
95c385b4 2647 if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) {
1da177e4
LT		 2648 addrconf_add_linklocal(idev, &lladdr);
2649 return 0;
2650 }
2651 return -1;
2652}
2653
2654static void ip6_tnl_add_linklocal(struct inet6_dev *idev)
2655{
2656 struct net_device *link_dev;
c346dca1 2657 struct net *net = dev_net(idev->dev);
1da177e4
LT		 2658
2659 /* first try to inherit the link-local address from the link device */
2660 if (idev->dev->iflink &&
6fda7350 2661 (link_dev = __dev_get_by_index(net, idev->dev->iflink))) {
1da177e4
LT		 2662 if (!ipv6_inherit_linklocal(idev, link_dev))
2663 return;
2664 }
2665 /* then try to inherit it from any device */
6fda7350 2666 for_each_netdev(net, link_dev) {
1da177e4
LT		 2667 if (!ipv6_inherit_linklocal(idev, link_dev))
2668 return;
2669 }
91df42be 2670 pr_debug("init ip6-ip6: add_linklocal failed\n");
1da177e4
LT		 2671}
2672
2673/*
2674 * Autoconfigure tunnel with a link-local address so routing protocols,
2675 * DHCPv6, MLD etc. can be run over the virtual link
2676 */
2677
2678static void addrconf_ip6_tnl_config(struct net_device *dev)
2679{
2680 struct inet6_dev *idev;
2681
2682 ASSERT_RTNL();
2683
e21e8467 2684 idev = addrconf_add_dev(dev);
64e724f6 2685 if (IS_ERR(idev)) {
91df42be 2686 pr_debug("init ip6-ip6: add_dev failed\n");
1da177e4
LT		 2687 return;
2688 }
2689 ip6_tnl_add_linklocal(idev);
1da177e4
LT		 2690}
2691
1ab1457c 2692static int addrconf_notify(struct notifier_block *this, unsigned long event,
8e5e8f30 2693 void *data)
1da177e4
LT		 2694{
2695 struct net_device *dev = (struct net_device *) data;
748e2d93 2696 struct inet6_dev *idev = __in6_dev_get(dev);
c5e33bdd 2697 int run_pending = 0;
b217d616 2698 int err;
1da177e4 2699
e21e8467 2700 switch (event) {
45ba9dd2 2701 case NETDEV_REGISTER:
74235a25 2702 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
45ba9dd2
YH		 2703 idev = ipv6_add_dev(dev);
2704 if (!idev)
b217d616 2705 return notifier_from_errno(-ENOMEM);
45ba9dd2
YH		 2706 }
2707 break;
bcdd553f 2708
1da177e4 2709 case NETDEV_UP:
3c21edbd 2710 case NETDEV_CHANGE:
c2edacf8
JV		 2711 if (dev->flags & IFF_SLAVE)
2712 break;
2713
3c21edbd 2714 if (event == NETDEV_UP) {
f24e3d65 2715 if (!addrconf_qdisc_ok(dev)) {
3c21edbd 2716 /* device is not ready yet. */
f3213831 2717 pr_info("ADDRCONF(NETDEV_UP): %s: link is not ready\n",
3c21edbd
YH		 2718 dev->name);
2719 break;
2720 }
99081049 2721
d31c7b8f
EP		 2722 if (!idev && dev->mtu >= IPV6_MIN_MTU)
2723 idev = ipv6_add_dev(dev);
2724
e3ec6cfc 2725 if (idev) {
99081049 2726 idev->if_flags |= IF_READY;
e3ec6cfc
BT		 2727 run_pending = 1;
2728 }
3c21edbd 2729 } else {
f24e3d65 2730 if (!addrconf_qdisc_ok(dev)) {
3c21edbd
YH		 2731 /* device is still not ready. */
2732 break;
2733 }
2734
2735 if (idev) {
bcdd553f 2736 if (idev->if_flags & IF_READY)
3c21edbd
YH		 2737 /* device is already configured. */
2738 break;
3c21edbd
YH		 2739 idev->if_flags |= IF_READY;
2740 }
2741
f3213831
JP		 2742 pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n",
2743 dev->name);
3c21edbd 2744
c5e33bdd 2745 run_pending = 1;
3c21edbd
YH		 2746 }
2747
e21e8467 2748 switch (dev->type) {
07a93626 2749#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4
LT		 2750 case ARPHRD_SIT:
2751 addrconf_sit_config(dev);
2752 break;
aee80b54 2753#endif
07a93626 2754#if IS_ENABLED(CONFIG_NET_IPGRE)
aee80b54 2755 case ARPHRD_IPGRE:
2756 addrconf_gre_config(dev);
2757 break;
0be669bb 2758#endif
1da177e4
LT		 2759 case ARPHRD_TUNNEL6:
2760 addrconf_ip6_tnl_config(dev);
2761 break;
2762 case ARPHRD_LOOPBACK:
2763 init_loopback(dev);
2764 break;
2765
2766 default:
2767 addrconf_dev_config(dev);
2768 break;
3ff50b79 2769 }
bcdd553f 2770
1da177e4 2771 if (idev) {
c5e33bdd
YH		 2772 if (run_pending)
2773 addrconf_dad_run(idev);
2774
bcdd553f
SH		 2775 /*
2776 * If the MTU changed during the interface down,
2777 * when the interface up, the changed MTU must be
2778 * reflected in the idev as well as routers.
1da177e4 2779 */
bcdd553f
SH		 2780 if (idev->cnf.mtu6 != dev->mtu &&
2781 dev->mtu >= IPV6_MIN_MTU) {
1da177e4
LT		 2782 rt6_mtu_change(dev, dev->mtu);
2783 idev->cnf.mtu6 = dev->mtu;
2784 }
2785 idev->tstamp = jiffies;
2786 inet6_ifinfo_notify(RTM_NEWLINK, idev);
bcdd553f
SH		 2787
2788 /*
2789 * If the changed mtu during down is lower than
2790 * IPV6_MIN_MTU stop IPv6 on this interface.
1da177e4
LT		 2791 */
2792 if (dev->mtu < IPV6_MIN_MTU)
bcdd553f 2793 addrconf_ifdown(dev, 1);
1da177e4
LT		 2794 }
2795 break;
2796
2797 case NETDEV_CHANGEMTU:
d31c7b8f 2798 if (idev && dev->mtu >= IPV6_MIN_MTU) {
1da177e4
LT		 2799 rt6_mtu_change(dev, dev->mtu);
2800 idev->cnf.mtu6 = dev->mtu;
2801 break;
2802 }
2803
d31c7b8f
EP		 2804 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2805 idev = ipv6_add_dev(dev);
2806 if (idev)
2807 break;
2808 }
2809
bcdd553f
SH		 2810 /*
2811 * MTU falled under IPV6_MIN_MTU.
2812 * Stop IPv6 on this interface.
2813 */
1da177e4
LT		 2814
2815 case NETDEV_DOWN:
2816 case NETDEV_UNREGISTER:
2817 /*
2818 * Remove all addresses from this interface.
2819 */
2820 addrconf_ifdown(dev, event != NETDEV_DOWN);
2821 break;
3c21edbd 2822
1da177e4 2823 case NETDEV_CHANGENAME:
1da177e4 2824 if (idev) {
5632c515 2825 snmp6_unregister_dev(idev);
408c4768 2826 addrconf_sysctl_unregister(idev);
f52295a9 2827 addrconf_sysctl_register(idev);
b217d616
HX		 2828 err = snmp6_register_dev(idev);
2829 if (err)
2830 return notifier_from_errno(err);
5632c515 2831 }
1da177e4 2832 break;
bcdd553f 2833
93d9b7d7
JP		 2834 case NETDEV_PRE_TYPE_CHANGE:
2835 case NETDEV_POST_TYPE_CHANGE:
2836 addrconf_type_change(dev, event);
75c78500 2837 break;
3ff50b79 2838 }
1da177e4
LT		 2839
2840 return NOTIFY_OK;
2841}
2842
2843/*
2844 * addrconf module should be notified of a device going up
2845 */
2846static struct notifier_block ipv6_dev_notf = {
2847 .notifier_call = addrconf_notify,
1da177e4
LT		 2848};
2849
93d9b7d7 2850static void addrconf_type_change(struct net_device *dev, unsigned long event)
75c78500
MS		 2851{
2852 struct inet6_dev *idev;
2853 ASSERT_RTNL();
2854
2855 idev = __in6_dev_get(dev);
2856
93d9b7d7 2857 if (event == NETDEV_POST_TYPE_CHANGE)
75c78500 2858 ipv6_mc_remap(idev);
93d9b7d7 2859 else if (event == NETDEV_PRE_TYPE_CHANGE)
75c78500
MS		 2860 ipv6_mc_unmap(idev);
2861}
2862
1da177e4
LT		 2863static int addrconf_ifdown(struct net_device *dev, int how)
2864{
c346dca1 2865 struct net *net = dev_net(dev);
502a2ffd 2866 struct inet6_dev *idev;
2867 struct inet6_ifaddr *ifa;
73a8bd74 2868 int state, i;
1da177e4
LT		 2869
2870 ASSERT_RTNL();
2871
73a8bd74
DM		 2872 rt6_ifdown(net, dev);
2873 neigh_ifdown(&nd_tbl, dev);
1da177e4
LT		 2874
2875 idev = __in6_dev_get(dev);
2876 if (idev == NULL)
2877 return -ENODEV;
2878
bcdd553f
SH		 2879 /*
2880 * Step 1: remove reference to ipv6 device from parent device.
2881 * Do not dev_put!
1da177e4 2882 */
439e2385 2883 if (how) {
1da177e4 2884 idev->dead = 1;
8814c4b5
YH		 2885
2886 /* protected by rtnl_lock */
a9b3cd7f 2887 RCU_INIT_POINTER(dev->ip6_ptr, NULL);
1da177e4
LT		 2888
2889 /* Step 1.5: remove snmp6 entry */
2890 snmp6_unregister_dev(idev);
2891
2892 }
2893
73a8bd74
DM		 2894 /* Step 2: clear hash table */
2895 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
2896 struct hlist_head *h = &inet6_addr_lst[i];
2897 struct hlist_node *n;
2898
2899 spin_lock_bh(&addrconf_hash_lock);
2900 restart:
2901 hlist_for_each_entry_rcu(ifa, n, h, addr_lst) {
2902 if (ifa->idev == idev) {
2903 hlist_del_init_rcu(&ifa->addr_lst);
2904 addrconf_del_timer(ifa);
2905 goto restart;
2906 }
2907 }
2908 spin_unlock_bh(&addrconf_hash_lock);
2909 }
2910
1da177e4
LT		 2911 write_lock_bh(&idev->lock);
2912
bcdd553f 2913 /* Step 2: clear flags for stateless addrconf */
439e2385 2914 if (!how)
3c21edbd 2915 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
1da177e4 2916
1da177e4 2917#ifdef CONFIG_IPV6_PRIVACY
439e2385 2918 if (how && del_timer(&idev->regen_timer))
1da177e4
LT		 2919 in6_dev_put(idev);
2920
bcdd553f 2921 /* Step 3: clear tempaddr list */
372e6c8f 2922 while (!list_empty(&idev->tempaddr_list)) {
2923 ifa = list_first_entry(&idev->tempaddr_list,
2924 struct inet6_ifaddr, tmp_list);
2925 list_del(&ifa->tmp_list);
1da177e4
LT		 2926 write_unlock_bh(&idev->lock);
2927 spin_lock_bh(&ifa->lock);
2928
2929 if (ifa->ifpub) {
2930 in6_ifa_put(ifa->ifpub);
2931 ifa->ifpub = NULL;
2932 }
2933 spin_unlock_bh(&ifa->lock);
2934 in6_ifa_put(ifa);
2935 write_lock_bh(&idev->lock);
2936 }
2937#endif
8f37ada5 2938
502a2ffd 2939 while (!list_empty(&idev->addr_list)) {
2940 ifa = list_first_entry(&idev->addr_list,
2941 struct inet6_ifaddr, if_list);
84e8b803 2942 addrconf_del_timer(ifa);
2943
73a8bd74 2944 list_del(&ifa->if_list);
84e8b803 2945
73a8bd74 2946 write_unlock_bh(&idev->lock);
84e8b803 2947
73a8bd74
DM		 2948 spin_lock_bh(&ifa->state_lock);
2949 state = ifa->state;
2950 ifa->state = INET6_IFADDR_STATE_DEAD;
2951 spin_unlock_bh(&ifa->state_lock);
9d82ca98 2952
73a8bd74
DM		 2953 if (state != INET6_IFADDR_STATE_DEAD) {
2954 __ipv6_ifa_notify(RTM_DELADDR, ifa);
2955 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifa);
27bdb2ab 2956 }
73a8bd74 2957 in6_ifa_put(ifa);
8f37ada5 2958
73a8bd74
DM		 2959 write_lock_bh(&idev->lock);
2960 }
8f37ada5 2961
1da177e4
LT		 2962 write_unlock_bh(&idev->lock);
2963
2964 /* Step 5: Discard multicast list */
439e2385 2965 if (how)
1da177e4
LT		 2966 ipv6_mc_destroy_dev(idev);
2967 else
2968 ipv6_mc_down(idev);
2969
1da177e4 2970 idev->tstamp = jiffies;
1ab1457c 2971
bcdd553f 2972 /* Last: Shot the device (if unregistered) */
439e2385 2973 if (how) {
408c4768 2974 addrconf_sysctl_unregister(idev);
1da177e4
LT		 2975 neigh_parms_release(&nd_tbl, idev->nd_parms);
2976 neigh_ifdown(&nd_tbl, dev);
2977 in6_dev_put(idev);
2978 }
2979 return 0;
2980}
2981
2982static void addrconf_rs_timer(unsigned long data)
2983{
2984 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
5b2a1953 2985 struct inet6_dev *idev = ifp->idev;
1da177e4 2986
5b2a1953 2987 read_lock(&idev->lock);
2988 if (idev->dead || !(idev->if_flags & IF_READY))
1da177e4
LT		 2989 goto out;
2990
5b2a1953 2991 if (idev->cnf.forwarding)
2992 goto out;
2993
2994 /* Announcement received after solicitation was sent */
2995 if (idev->if_flags & IF_RA_RCVD)
1da177e4 2996 goto out;
1da177e4
LT		 2997
2998 spin_lock(&ifp->lock);
5b2a1953 2999 if (ifp->probes++ < idev->cnf.rtr_solicits) {
1da177e4
LT		 3000 /* The wait after the last probe can be shorter */
3001 addrconf_mod_timer(ifp, AC_RS,
5b2a1953 3002 (ifp->probes == idev->cnf.rtr_solicits) ?
3003 idev->cnf.rtr_solicit_delay :
3004 idev->cnf.rtr_solicit_interval);
1da177e4
LT		 3005 spin_unlock(&ifp->lock);
3006
5b2a1953 3007 ndisc_send_rs(idev->dev, &ifp->addr, &in6addr_linklocal_allrouters);
1da177e4
LT		 3008 } else {
3009 spin_unlock(&ifp->lock);
3010 /*
3011 * Note: we do not support deprecated "all on-link"
3012 * assumption any longer.
3013 */
91df42be 3014 pr_debug("%s: no IPv6 routers present\n", idev->dev->name);
1da177e4
LT		 3015 }
3016
3017out:
5b2a1953 3018 read_unlock(&idev->lock);
1da177e4
LT		 3019 in6_ifa_put(ifp);
3020}
3021
3022/*
3023 * Duplicate Address Detection
3024 */
3c21edbd
YH		 3025static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
3026{
3027 unsigned long rand_num;
3028 struct inet6_dev *idev = ifp->idev;
3029
95c385b4
NH		 3030 if (ifp->flags & IFA_F_OPTIMISTIC)
3031 rand_num = 0;
3032 else
3033 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1);
3034
3c21edbd
YH		 3035 ifp->probes = idev->cnf.dad_transmits;
3036 addrconf_mod_timer(ifp, AC_DAD, rand_num);
3037}
3038
cf22f9a2 3039static void addrconf_dad_start(struct inet6_ifaddr *ifp)
1da177e4
LT		 3040{
3041 struct inet6_dev *idev = ifp->idev;
3042 struct net_device *dev = idev->dev;
1da177e4
LT		 3043
3044 addrconf_join_solict(dev, &ifp->addr);
3045
1da177e4 3046 net_srandom(ifp->addr.s6_addr32[3]);
1da177e4
LT		 3047
3048 read_lock_bh(&idev->lock);
622ccdf1 3049 spin_lock(&ifp->lock);
e9d3e084 3050 if (ifp->state == INET6_IFADDR_STATE_DEAD)
1da177e4 3051 goto out;
1da177e4
LT		 3052
3053 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
1b34be74 3054 idev->cnf.accept_dad < 1 ||
55ebaef1
NT		 3055 !(ifp->flags&IFA_F_TENTATIVE) ||
3056 ifp->flags & IFA_F_NODAD) {
cc411d0b 3057 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
21809faf 3058 spin_unlock(&ifp->lock);
1da177e4
LT		 3059 read_unlock_bh(&idev->lock);
3060
3061 addrconf_dad_completed(ifp);
3062 return;
3063 }
3064
6732bade 3065 if (!(idev->if_flags & IF_READY)) {
21809faf 3066 spin_unlock(&ifp->lock);
6732bade 3067 read_unlock_bh(&idev->lock);
3c21edbd 3068 /*
590a9887 3069 * If the device is not ready:
3c21edbd
YH		 3070 * - keep it tentative if it is a permanent address.
3071 * - otherwise, kill it.
3072 */
3073 in6_ifa_hold(ifp);
cc411d0b 3074 addrconf_dad_stop(ifp, 0);
6732bade 3075 return;
3c21edbd 3076 }
95c385b4
NH		 3077
3078 /*
3079 * Optimistic nodes can start receiving
3080 * Frames right away
3081 */
e21e8467 3082 if (ifp->flags & IFA_F_OPTIMISTIC)
95c385b4
NH		 3083 ip6_ins_rt(ifp->rt);
3084
6732bade 3085 addrconf_dad_kick(ifp);
1da177e4 3086out:
622ccdf1 3087 spin_unlock(&ifp->lock);
1da177e4
LT		 3088 read_unlock_bh(&idev->lock);
3089}
3090
3091static void addrconf_dad_timer(unsigned long data)
3092{
3093 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
3094 struct inet6_dev *idev = ifp->idev;
1da177e4
LT		 3095 struct in6_addr mcaddr;
3096
f2344a13
HX		 3097 if (!ifp->probes && addrconf_dad_end(ifp))
3098 goto out;
3099
122e4519 3100 read_lock(&idev->lock);
3101 if (idev->dead || !(idev->if_flags & IF_READY)) {
3102 read_unlock(&idev->lock);
1da177e4
LT		 3103 goto out;
3104 }
21809faf 3105
3106 spin_lock(&ifp->lock);
622ccdf1
HX		 3107 if (ifp->state == INET6_IFADDR_STATE_DEAD) {
3108 spin_unlock(&ifp->lock);
3109 read_unlock(&idev->lock);
3110 goto out;
3111 }
3112
1da177e4
LT		 3113 if (ifp->probes == 0) {
3114 /*
3115 * DAD was successful
3116 */
3117
cc411d0b 3118 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
21809faf 3119 spin_unlock(&ifp->lock);
122e4519 3120 read_unlock(&idev->lock);
1da177e4
LT		 3121
3122 addrconf_dad_completed(ifp);
3123
3124 goto out;
3125 }
3126
3127 ifp->probes--;
3128 addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time);
21809faf 3129 spin_unlock(&ifp->lock);
122e4519 3130 read_unlock(&idev->lock);
1da177e4
LT		 3131
3132 /* send a neighbour solicitation for our addr */
1da177e4 3133 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
d7aabf22 3134 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &in6addr_any);
1da177e4
LT		 3135out:
3136 in6_ifa_put(ifp);
3137}
3138
3139static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
3140{
e21e8467 3141 struct net_device *dev = ifp->idev->dev;
1da177e4
LT		 3142
3143 /*
3144 * Configure the address for reception. Now it is valid.
3145 */
3146
3147 ipv6_ifa_notify(RTM_NEWADDR, ifp);
3148
026359bc
TA		 3149 /* If added prefix is link local and we are prepared to process
3150 router advertisements, start sending router solicitations.
1da177e4
LT		 3151 */
3152
026359bc
TA		 3153 if (((ifp->idev->cnf.accept_ra == 1 && !ifp->idev->cnf.forwarding) ||
3154 ifp->idev->cnf.accept_ra == 2) &&
1da177e4
LT		 3155 ifp->idev->cnf.rtr_solicits > 0 &&
3156 (dev->flags&IFF_LOOPBACK) == 0 &&
3157 (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) {
1da177e4
LT		 3158 /*
3159 * If a host as already performed a random delay
3160 * [...] as part of DAD [...] there is no need
3161 * to delay again before sending the first RS
3162 */
f3ee4010 3163 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &in6addr_linklocal_allrouters);
1da177e4
LT		 3164
3165 spin_lock_bh(&ifp->lock);
3166 ifp->probes = 1;
3167 ifp->idev->if_flags |= IF_RS_SENT;
3168 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval);
3169 spin_unlock_bh(&ifp->lock);
3170 }
3171}
3172
e21e8467
SH		 3173static void addrconf_dad_run(struct inet6_dev *idev)
3174{
c5e33bdd
YH		 3175 struct inet6_ifaddr *ifp;
3176
3177 read_lock_bh(&idev->lock);
502a2ffd 3178 list_for_each_entry(ifp, &idev->addr_list, if_list) {
21809faf 3179 spin_lock(&ifp->lock);
f2344a13
HX		 3180 if (ifp->flags & IFA_F_TENTATIVE &&
3181 ifp->state == INET6_IFADDR_STATE_DAD)
3182 addrconf_dad_kick(ifp);
21809faf 3183 spin_unlock(&ifp->lock);
c5e33bdd
YH		 3184 }
3185 read_unlock_bh(&idev->lock);
3186}
3187
1da177e4
LT		 3188#ifdef CONFIG_PROC_FS
3189struct if6_iter_state {
3c40090a 3190 struct seq_net_private p;
1da177e4 3191 int bucket;
1d578303 3192 int offset;
1da177e4
LT		 3193};
3194
1d578303 3195static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos)
1da177e4
LT		 3196{
3197 struct inet6_ifaddr *ifa = NULL;
3198 struct if6_iter_state *state = seq->private;
1218854a 3199 struct net *net = seq_file_net(seq);
1d578303 3200 int p = 0;
1da177e4 3201
1d578303
MM		 3202 /* initial bucket if pos is 0 */
3203 if (pos == 0) {
3204 state->bucket = 0;
3205 state->offset = 0;
3206 }
3207
3208 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
c2e21293 3209 struct hlist_node *n;
4f70ecca 3210 hlist_for_each_entry_rcu_bh(ifa, n, &inet6_addr_lst[state->bucket],
1d578303 3211 addr_lst) {
9f0d3c27
ED		 3212 if (!net_eq(dev_net(ifa->idev->dev), net))
3213 continue;
1d578303
MM		 3214 /* sync with offset */
3215 if (p < state->offset) {
3216 p++;
3217 continue;
3218 }
3219 state->offset++;
9f0d3c27 3220 return ifa;
1d578303
MM		 3221 }
3222
3223 /* prepare for next bucket */
3224 state->offset = 0;
3225 p = 0;
1da177e4 3226 }
c2e21293 3227 return NULL;
1da177e4
LT		 3228}
3229
c2e21293 3230static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
3231 struct inet6_ifaddr *ifa)
1da177e4
LT		 3232{
3233 struct if6_iter_state *state = seq->private;
1218854a 3234 struct net *net = seq_file_net(seq);
c2e21293 3235 struct hlist_node *n = &ifa->addr_lst;
1da177e4 3236
1d578303 3237 hlist_for_each_entry_continue_rcu_bh(ifa, n, addr_lst) {
9f0d3c27
ED		 3238 if (!net_eq(dev_net(ifa->idev->dev), net))
3239 continue;
1d578303 3240 state->offset++;
9f0d3c27 3241 return ifa;
1d578303 3242 }
3c40090a 3243
c2e21293 3244 while (++state->bucket < IN6_ADDR_HSIZE) {
1d578303 3245 state->offset = 0;
4f70ecca 3246 hlist_for_each_entry_rcu_bh(ifa, n,
c2e21293 3247 &inet6_addr_lst[state->bucket], addr_lst) {
9f0d3c27
ED		 3248 if (!net_eq(dev_net(ifa->idev->dev), net))
3249 continue;
1d578303 3250 state->offset++;
9f0d3c27 3251 return ifa;
c2e21293 3252 }
1da177e4 3253 }
3c40090a 3254
c2e21293 3255 return NULL;
1da177e4
LT		 3256}
3257
1da177e4 3258static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
4f70ecca 3259 __acquires(rcu_bh)
1da177e4 3260{
5c578aed 3261 rcu_read_lock_bh();
1d578303 3262 return if6_get_first(seq, *pos);
1da177e4
LT		 3263}
3264
3265static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3266{
3267 struct inet6_ifaddr *ifa;
3268
3269 ifa = if6_get_next(seq, v);
3270 ++*pos;
3271 return ifa;
3272}
3273
3274static void if6_seq_stop(struct seq_file *seq, void *v)
4f70ecca 3275 __releases(rcu_bh)
1da177e4 3276{
5c578aed 3277 rcu_read_unlock_bh();
1da177e4
LT		 3278}
3279
3280static int if6_seq_show(struct seq_file *seq, void *v)
3281{
3282 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
4b7a4274 3283 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
b071195d 3284 &ifp->addr,
1da177e4
LT		 3285 ifp->idev->dev->ifindex,
3286 ifp->prefix_len,
3287 ifp->scope,
3288 ifp->flags,
3289 ifp->idev->dev->name);
3290 return 0;
3291}
3292
56b3d975 3293static const struct seq_operations if6_seq_ops = {
1da177e4
LT		 3294 .start = if6_seq_start,
3295 .next = if6_seq_next,
3296 .show = if6_seq_show,
3297 .stop = if6_seq_stop,
3298};
3299
3300static int if6_seq_open(struct inode *inode, struct file *file)
3301{
3c40090a
DL		 3302 return seq_open_net(inode, file, &if6_seq_ops,
3303 sizeof(struct if6_iter_state));
1da177e4
LT		 3304}
3305
9a32144e 3306static const struct file_operations if6_fops = {
1da177e4
LT		 3307 .owner = THIS_MODULE,
3308 .open = if6_seq_open,
3309 .read = seq_read,
3310 .llseek = seq_lseek,
3c40090a 3311 .release = seq_release_net,
1da177e4
LT		 3312};
3313
2c8c1e72 3314static int __net_init if6_proc_net_init(struct net *net)
1da177e4 3315{
3c40090a 3316 if (!proc_net_fops_create(net, "if_inet6", S_IRUGO, &if6_fops))
1da177e4
LT		 3317 return -ENOMEM;
3318 return 0;
3319}
3320
2c8c1e72 3321static void __net_exit if6_proc_net_exit(struct net *net)
3c40090a
DL		 3322{
3323 proc_net_remove(net, "if_inet6");
3324}
3325
3326static struct pernet_operations if6_proc_net_ops = {
3327 .init = if6_proc_net_init,
3328 .exit = if6_proc_net_exit,
3329};
3330
3331int __init if6_proc_init(void)
3332{
3333 return register_pernet_subsys(&if6_proc_net_ops);
3334}
3335
1da177e4
LT		 3336void if6_proc_exit(void)
3337{
3c40090a 3338 unregister_pernet_subsys(&if6_proc_net_ops);
1da177e4
LT		 3339}
3340#endif /* CONFIG_PROC_FS */
3341
07a93626 3342#if IS_ENABLED(CONFIG_IPV6_MIP6)
3b9f9a1c 3343/* Check if address is a home address configured on any interface. */
b71d1d42 3344int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr)
3b9f9a1c
NT		 3345{
3346 int ret = 0;
c2e21293 3347 struct inet6_ifaddr *ifp = NULL;
3348 struct hlist_node *n;
ddbe5032 3349 unsigned int hash = inet6_addr_hash(addr);
c2e21293 3350
5c578aed 3351 rcu_read_lock_bh();
4f70ecca 3352 hlist_for_each_entry_rcu_bh(ifp, n, &inet6_addr_lst[hash], addr_lst) {
878628fb 3353 if (!net_eq(dev_net(ifp->idev->dev), net))
389f6612 3354 continue;
caad295f 3355 if (ipv6_addr_equal(&ifp->addr, addr) &&
3b9f9a1c
NT		 3356 (ifp->flags & IFA_F_HOMEADDRESS)) {
3357 ret = 1;
3358 break;
3359 }
3360 }
5c578aed 3361 rcu_read_unlock_bh();
3b9f9a1c
NT		 3362 return ret;
3363}
3364#endif
3365
1da177e4
LT		 3366/*
3367 * Periodic address status verification
3368 */
3369
3370static void addrconf_verify(unsigned long foo)
3371{
b2db7564 3372 unsigned long now, next, next_sec, next_sched;
1da177e4 3373 struct inet6_ifaddr *ifp;
c2e21293 3374 struct hlist_node *node;
1da177e4
LT		 3375 int i;
3376
5c578aed 3377 rcu_read_lock_bh();
3378 spin_lock(&addrconf_verify_lock);
1da177e4 3379 now = jiffies;
b2db7564 3380 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
1da177e4
LT		 3381
3382 del_timer(&addr_chk_timer);
3383
bcdd553f 3384 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
1da177e4 3385restart:
4f70ecca 3386 hlist_for_each_entry_rcu_bh(ifp, node,
5c578aed 3387 &inet6_addr_lst[i], addr_lst) {
1da177e4 3388 unsigned long age;
1da177e4
LT		 3389
3390 if (ifp->flags & IFA_F_PERMANENT)
3391 continue;
3392
3393 spin_lock(&ifp->lock);
b2db7564
YH		 3394 /* We try to batch several events at once. */
3395 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
1da177e4 3396
8f27ebb9
YH		 3397 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
3398 age >= ifp->valid_lft) {
1da177e4
LT		 3399 spin_unlock(&ifp->lock);
3400 in6_ifa_hold(ifp);
1da177e4
LT		 3401 ipv6_del_addr(ifp);
3402 goto restart;
8f27ebb9
YH		 3403 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
3404 spin_unlock(&ifp->lock);
3405 continue;
1da177e4 3406 } else if (age >= ifp->prefered_lft) {
a1ed0526 3407 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
1da177e4
LT		 3408 int deprecate = 0;
3409
3410 if (!(ifp->flags&IFA_F_DEPRECATED)) {
3411 deprecate = 1;
3412 ifp->flags |= IFA_F_DEPRECATED;
3413 }
3414
3415 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))
3416 next = ifp->tstamp + ifp->valid_lft * HZ;
3417
3418 spin_unlock(&ifp->lock);
3419
3420 if (deprecate) {
3421 in6_ifa_hold(ifp);
1da177e4
LT		 3422
3423 ipv6_ifa_notify(0, ifp);
3424 in6_ifa_put(ifp);
3425 goto restart;
3426 }
3427#ifdef CONFIG_IPV6_PRIVACY
3428 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
3429 !(ifp->flags&IFA_F_TENTATIVE)) {
88949cf4 3430 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
3431 ifp->idev->cnf.dad_transmits *
3432 ifp->idev->nd_parms->retrans_time / HZ;
3433
1da177e4
LT		 3434 if (age >= ifp->prefered_lft - regen_advance) {
3435 struct inet6_ifaddr *ifpub = ifp->ifpub;
3436 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3437 next = ifp->tstamp + ifp->prefered_lft * HZ;
3438 if (!ifp->regen_count && ifpub) {
3439 ifp->regen_count++;
3440 in6_ifa_hold(ifp);
3441 in6_ifa_hold(ifpub);
3442 spin_unlock(&ifp->lock);
5c578aed 3443
291d809b
HY		 3444 spin_lock(&ifpub->lock);
3445 ifpub->regen_count = 0;
3446 spin_unlock(&ifpub->lock);
1da177e4
LT		 3447 ipv6_create_tempaddr(ifpub, ifp);
3448 in6_ifa_put(ifpub);
3449 in6_ifa_put(ifp);
3450 goto restart;
3451 }
3452 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
3453 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
3454 spin_unlock(&ifp->lock);
3455#endif
3456 } else {
3457 /* ifp->prefered_lft <= ifp->valid_lft */
3458 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3459 next = ifp->tstamp + ifp->prefered_lft * HZ;
3460 spin_unlock(&ifp->lock);
3461 }
3462 }
1da177e4
LT		 3463 }
3464
b2db7564
YH		 3465 next_sec = round_jiffies_up(next);
3466 next_sched = next;
3467
3468 /* If rounded timeout is accurate enough, accept it. */
3469 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
3470 next_sched = next_sec;
3471
3472 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
3473 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
3474 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
3475
3476 ADBG((KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
3477 now, next, next_sec, next_sched));
3478
3479 addr_chk_timer.expires = next_sched;
1da177e4 3480 add_timer(&addr_chk_timer);
5c578aed 3481 spin_unlock(&addrconf_verify_lock);
3482 rcu_read_unlock_bh();
1da177e4
LT		 3483}
3484
461d8837
TG		 3485static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local)
3486{
3487 struct in6_addr *pfx = NULL;
3488
3489 if (addr)
3490 pfx = nla_data(addr);
3491
3492 if (local) {
3493 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
3494 pfx = NULL;
3495 else
3496 pfx = nla_data(local);
3497 }
3498
3499 return pfx;
3500}
3501
ef7c79ed 3502static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
461d8837
TG		 3503 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
3504 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
3505 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
3506};
3507
1da177e4
LT		 3508static int
3509inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3510{
3b1e0a65 3511 struct net *net = sock_net(skb->sk);
b933f716
TG		 3512 struct ifaddrmsg *ifm;
3513 struct nlattr *tb[IFA_MAX+1];
1da177e4 3514 struct in6_addr *pfx;
b933f716 3515 int err;
1da177e4 3516
dfc47ef8
EB		 3517 if (!capable(CAP_NET_ADMIN))
3518 return -EPERM;
3519
b933f716
TG		 3520 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3521 if (err < 0)
3522 return err;
3523
3524 ifm = nlmsg_data(nlh);
3525 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
1da177e4
LT		 3526 if (pfx == NULL)
3527 return -EINVAL;
3528
af284937 3529 return inet6_addr_del(net, ifm->ifa_index, pfx, ifm->ifa_prefixlen);
1da177e4
LT		 3530}
3531
55ebaef1
NT		 3532static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags,
3533 u32 prefered_lft, u32 valid_lft)
081bba5b 3534{
6f704992
YH		 3535 u32 flags;
3536 clock_t expires;
4bed72e4 3537 unsigned long timeout;
46d48046 3538
081bba5b
NT		 3539 if (!valid_lft || (prefered_lft > valid_lft))
3540 return -EINVAL;
3541
4bed72e4
YH		 3542 timeout = addrconf_timeout_fixup(valid_lft, HZ);
3543 if (addrconf_finite_timeout(timeout)) {
3544 expires = jiffies_to_clock_t(timeout * HZ);
3545 valid_lft = timeout;
6f704992 3546 flags = RTF_EXPIRES;
4bed72e4
YH		 3547 } else {
3548 expires = 0;
3549 flags = 0;
3550 ifa_flags |= IFA_F_PERMANENT;
6f704992 3551 }
081bba5b 3552
4bed72e4
YH		 3553 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
3554 if (addrconf_finite_timeout(timeout)) {
3555 if (timeout == 0)
3556 ifa_flags |= IFA_F_DEPRECATED;
3557 prefered_lft = timeout;
3558 }
081bba5b
NT		 3559
3560 spin_lock_bh(&ifp->lock);
3b9f9a1c 3561 ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags;
081bba5b
NT		 3562 ifp->tstamp = jiffies;
3563 ifp->valid_lft = valid_lft;
3564 ifp->prefered_lft = prefered_lft;
3565
3566 spin_unlock_bh(&ifp->lock);
3567 if (!(ifp->flags&IFA_F_TENTATIVE))
3568 ipv6_ifa_notify(0, ifp);
081bba5b 3569
46d48046 3570 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
6f704992 3571 expires, flags);
081bba5b
NT		 3572 addrconf_verify(0);
3573
3574 return 0;
3575}
3576
1da177e4
LT		 3577static int
3578inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3579{
3b1e0a65 3580 struct net *net = sock_net(skb->sk);
461d8837
TG		 3581 struct ifaddrmsg *ifm;
3582 struct nlattr *tb[IFA_MAX+1];
1da177e4 3583 struct in6_addr *pfx;
7198f8ce
TG		 3584 struct inet6_ifaddr *ifa;
3585 struct net_device *dev;
55ebaef1
NT		 3586 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
3587 u8 ifa_flags;
461d8837 3588 int err;
1da177e4 3589
dfc47ef8
EB		 3590 if (!capable(CAP_NET_ADMIN))
3591 return -EPERM;
3592
461d8837
TG		 3593 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3594 if (err < 0)
3595 return err;
3596
3597 ifm = nlmsg_data(nlh);
3598 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
1da177e4
LT		 3599 if (pfx == NULL)
3600 return -EINVAL;
3601
461d8837 3602 if (tb[IFA_CACHEINFO]) {
0778769d 3603 struct ifa_cacheinfo *ci;
461d8837
TG		 3604
3605 ci = nla_data(tb[IFA_CACHEINFO]);
0778769d 3606 valid_lft = ci->ifa_valid;
461d8837
TG		 3607 preferred_lft = ci->ifa_prefered;
3608 } else {
3609 preferred_lft = INFINITY_LIFE_TIME;
3610 valid_lft = INFINITY_LIFE_TIME;
0778769d
NT		 3611 }
3612
af284937 3613 dev = __dev_get_by_index(net, ifm->ifa_index);
7198f8ce
TG		 3614 if (dev == NULL)
3615 return -ENODEV;
3616
55ebaef1 3617 /* We ignore other flags so far. */
3b9f9a1c 3618 ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS);
55ebaef1 3619
1cab3da6 3620 ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
7198f8ce
TG		 3621 if (ifa == NULL) {
3622 /*
3623 * It would be best to check for !NLM_F_CREATE here but
3624 * userspace alreay relies on not having to provide this.
3625 */
af284937
DL		 3626 return inet6_addr_add(net, ifm->ifa_index, pfx,
3627 ifm->ifa_prefixlen, ifa_flags,
3628 preferred_lft, valid_lft);
081bba5b
NT		 3629 }
3630
7198f8ce
TG		 3631 if (nlh->nlmsg_flags & NLM_F_EXCL ||
3632 !(nlh->nlmsg_flags & NLM_F_REPLACE))
3633 err = -EEXIST;
3634 else
55ebaef1 3635 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
7198f8ce
TG		 3636
3637 in6_ifa_put(ifa);
3638
3639 return err;
1da177e4
LT		 3640}
3641
101bb229
TG		 3642static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags,
3643 u8 scope, int ifindex)
3644{
3645 struct ifaddrmsg *ifm;
3646
3647 ifm = nlmsg_data(nlh);
3648 ifm->ifa_family = AF_INET6;
3649 ifm->ifa_prefixlen = prefixlen;
3650 ifm->ifa_flags = flags;
3651 ifm->ifa_scope = scope;
3652 ifm->ifa_index = ifindex;
3653}
3654
85486af0
TG		 3655static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
3656 unsigned long tstamp, u32 preferred, u32 valid)
3657{
3658 struct ifa_cacheinfo ci;
3659
18a31e1e
TG		 3660 ci.cstamp = cstamp_delta(cstamp);
3661 ci.tstamp = cstamp_delta(tstamp);
85486af0
TG		 3662 ci.ifa_prefered = preferred;
3663 ci.ifa_valid = valid;
3664
3665 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
3666}
3667
101bb229
TG		 3668static inline int rt_scope(int ifa_scope)
3669{
3670 if (ifa_scope & IFA_HOST)
3671 return RT_SCOPE_HOST;
3672 else if (ifa_scope & IFA_LINK)
3673 return RT_SCOPE_LINK;
3674 else if (ifa_scope & IFA_SITE)
3675 return RT_SCOPE_SITE;
3676 else
3677 return RT_SCOPE_UNIVERSE;
3678}
3679
0ab6803b
TG		 3680static inline int inet6_ifaddr_msgsize(void)
3681{
339bf98f
TG		 3682 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
3683 + nla_total_size(16) /* IFA_ADDRESS */
3684 + nla_total_size(sizeof(struct ifa_cacheinfo));
0ab6803b 3685}
c5396a31 3686
1da177e4 3687static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
15e47304 3688 u32 portid, u32 seq, int event, unsigned int flags)
1da177e4 3689{
1da177e4 3690 struct nlmsghdr *nlh;
85486af0 3691 u32 preferred, valid;
1da177e4 3692
15e47304 3693 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
0ab6803b 3694 if (nlh == NULL)
26932566 3695 return -EMSGSIZE;
0ab6803b 3696
101bb229
TG		 3697 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
3698 ifa->idev->dev->ifindex);
3699
1da177e4 3700 if (!(ifa->flags&IFA_F_PERMANENT)) {
85486af0
TG		 3701 preferred = ifa->prefered_lft;
3702 valid = ifa->valid_lft;
3703 if (preferred != INFINITY_LIFE_TIME) {
1da177e4 3704 long tval = (jiffies - ifa->tstamp)/HZ;
a1faa698
JR		 3705 if (preferred > tval)
3706 preferred -= tval;
3707 else
3708 preferred = 0;
f56619fc
BH		 3709 if (valid != INFINITY_LIFE_TIME) {
3710 if (valid > tval)
3711 valid -= tval;
3712 else
3713 valid = 0;
3714 }
1da177e4
LT		 3715 }
3716 } else {
85486af0
TG		 3717 preferred = INFINITY_LIFE_TIME;
3718 valid = INFINITY_LIFE_TIME;
3719 }
3720
0ab6803b 3721 if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0 ||
26932566
PM		 3722 put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) {
3723 nlmsg_cancel(skb, nlh);
3724 return -EMSGSIZE;
3725 }
1da177e4 3726
0ab6803b 3727 return nlmsg_end(skb, nlh);
1da177e4
LT		 3728}
3729
3730static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
15e47304 3731 u32 portid, u32 seq, int event, u16 flags)
1da177e4 3732{
1da177e4 3733 struct nlmsghdr *nlh;
101bb229
TG		 3734 u8 scope = RT_SCOPE_UNIVERSE;
3735 int ifindex = ifmca->idev->dev->ifindex;
3736
3737 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
3738 scope = RT_SCOPE_SITE;
1da177e4 3739
15e47304 3740 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
0ab6803b 3741 if (nlh == NULL)
26932566 3742 return -EMSGSIZE;
85486af0 3743
0ab6803b
TG		 3744 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3745 if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 ||
3746 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
26932566
PM		 3747 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3748 nlmsg_cancel(skb, nlh);
3749 return -EMSGSIZE;
3750 }
85486af0 3751
0ab6803b 3752 return nlmsg_end(skb, nlh);
1da177e4
LT		 3753}
3754
3755static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
15e47304 3756 u32 portid, u32 seq, int event, unsigned int flags)
1da177e4 3757{
1da177e4 3758 struct nlmsghdr *nlh;
101bb229
TG		 3759 u8 scope = RT_SCOPE_UNIVERSE;
3760 int ifindex = ifaca->aca_idev->dev->ifindex;
3761
3762 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
3763 scope = RT_SCOPE_SITE;
1da177e4 3764
15e47304 3765 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
0ab6803b 3766 if (nlh == NULL)
26932566 3767 return -EMSGSIZE;
85486af0 3768
0ab6803b
TG		 3769 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3770 if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 ||
3771 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
26932566
PM		 3772 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3773 nlmsg_cancel(skb, nlh);
3774 return -EMSGSIZE;
3775 }
1da177e4 3776
0ab6803b 3777 return nlmsg_end(skb, nlh);
1da177e4
LT		 3778}
3779
e21e8467 3780enum addr_type_t {
1da177e4
LT		 3781 UNICAST_ADDR,
3782 MULTICAST_ADDR,
3783 ANYCAST_ADDR,
3784};
3785
234b27c3
ED		 3786/* called with rcu_read_lock() */
3787static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
3788 struct netlink_callback *cb, enum addr_type_t type,
3789 int s_ip_idx, int *p_ip_idx)
3790{
234b27c3
ED		 3791 struct ifmcaddr6 *ifmca;
3792 struct ifacaddr6 *ifaca;
3793 int err = 1;
3794 int ip_idx = *p_ip_idx;
3795
3796 read_lock_bh(&idev->lock);
3797 switch (type) {
502a2ffd 3798 case UNICAST_ADDR: {
3799 struct inet6_ifaddr *ifa;
3800
234b27c3 3801 /* unicast address incl. temp addr */
502a2ffd 3802 list_for_each_entry(ifa, &idev->addr_list, if_list) {
3803 if (++ip_idx < s_ip_idx)
234b27c3
ED		 3804 continue;
3805 err = inet6_fill_ifaddr(skb, ifa,
15e47304 3806 NETLINK_CB(cb->skb).portid,
234b27c3
ED		 3807 cb->nlh->nlmsg_seq,
3808 RTM_NEWADDR,
3809 NLM_F_MULTI);
3810 if (err <= 0)
3811 break;
3812 }
3813 break;
502a2ffd 3814 }
234b27c3
ED		 3815 case MULTICAST_ADDR:
3816 /* multicast address */
3817 for (ifmca = idev->mc_list; ifmca;
3818 ifmca = ifmca->next, ip_idx++) {
3819 if (ip_idx < s_ip_idx)
3820 continue;
3821 err = inet6_fill_ifmcaddr(skb, ifmca,
15e47304 3822 NETLINK_CB(cb->skb).portid,
234b27c3
ED		 3823 cb->nlh->nlmsg_seq,
3824 RTM_GETMULTICAST,
3825 NLM_F_MULTI);
3826 if (err <= 0)
3827 break;
3828 }
3829 break;
3830 case ANYCAST_ADDR:
3831 /* anycast address */
3832 for (ifaca = idev->ac_list; ifaca;
3833 ifaca = ifaca->aca_next, ip_idx++) {
3834 if (ip_idx < s_ip_idx)
3835 continue;
3836 err = inet6_fill_ifacaddr(skb, ifaca,
15e47304 3837 NETLINK_CB(cb->skb).portid,
234b27c3
ED		 3838 cb->nlh->nlmsg_seq,
3839 RTM_GETANYCAST,
3840 NLM_F_MULTI);
3841 if (err <= 0)
3842 break;
3843 }
3844 break;
3845 default:
3846 break;
3847 }
3848 read_unlock_bh(&idev->lock);
3849 *p_ip_idx = ip_idx;
3850 return err;
3851}
3852
1da177e4
LT		 3853static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
3854 enum addr_type_t type)
3855{
234b27c3
ED		 3856 struct net *net = sock_net(skb->sk);
3857 int h, s_h;
1da177e4
LT		 3858 int idx, ip_idx;
3859 int s_idx, s_ip_idx;
1da177e4 3860 struct net_device *dev;
234b27c3
ED		 3861 struct inet6_dev *idev;
3862 struct hlist_head *head;
3863 struct hlist_node *node;
1ab1457c 3864
234b27c3
ED		 3865 s_h = cb->args[0];
3866 s_idx = idx = cb->args[1];
3867 s_ip_idx = ip_idx = cb->args[2];
5d5619b4 3868
234b27c3
ED		 3869 rcu_read_lock();
3870 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
3871 idx = 0;
3872 head = &net->dev_index_head[h];
3873 hlist_for_each_entry_rcu(dev, node, head, index_hlist) {
3874 if (idx < s_idx)
3875 goto cont;
4b97efdf 3876 if (h > s_h || idx > s_idx)
234b27c3
ED		 3877 s_ip_idx = 0;
3878 ip_idx = 0;
e21e8467
SH		 3879 idev = __in6_dev_get(dev);
3880 if (!idev)
234b27c3
ED		 3881 goto cont;
3882
3883 if (in6_dump_addrs(idev, skb, cb, type,
3884 s_ip_idx, &ip_idx) <= 0)
3885 goto done;
7562f876 3886cont:
234b27c3
ED		 3887 idx++;
3888 }
1da177e4 3889 }
234b27c3
ED		 3890done:
3891 rcu_read_unlock();
3892 cb->args[0] = h;
3893 cb->args[1] = idx;
3894 cb->args[2] = ip_idx;
3895
1da177e4
LT		 3896 return skb->len;
3897}
3898
3899static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
3900{
3901 enum addr_type_t type = UNICAST_ADDR;
b854272b 3902
1da177e4
LT		 3903 return inet6_dump_addr(skb, cb, type);
3904}
3905
3906static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
3907{
3908 enum addr_type_t type = MULTICAST_ADDR;
b854272b 3909
1da177e4
LT		 3910 return inet6_dump_addr(skb, cb, type);
3911}
3912
3913
3914static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
3915{
3916 enum addr_type_t type = ANYCAST_ADDR;
b854272b 3917
1da177e4
LT		 3918 return inet6_dump_addr(skb, cb, type);
3919}
3920
8e5e8f30 3921static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh,
1b29fc2c 3922 void *arg)
6c223828 3923{
3b1e0a65 3924 struct net *net = sock_net(in_skb->sk);
1b29fc2c
TG		 3925 struct ifaddrmsg *ifm;
3926 struct nlattr *tb[IFA_MAX+1];
6c223828
NT		 3927 struct in6_addr *addr = NULL;
3928 struct net_device *dev = NULL;
3929 struct inet6_ifaddr *ifa;
3930 struct sk_buff *skb;
6c223828
NT		 3931 int err;
3932
1b29fc2c
TG		 3933 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3934 if (err < 0)
3935 goto errout;
3936
3937 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3938 if (addr == NULL) {
3939 err = -EINVAL;
3940 goto errout;
6c223828 3941 }
6c223828 3942
1b29fc2c 3943 ifm = nlmsg_data(nlh);
6c223828 3944 if (ifm->ifa_index)
6fda7350 3945 dev = __dev_get_by_index(net, ifm->ifa_index);
6c223828 3946
e21e8467
SH		 3947 ifa = ipv6_get_ifaddr(net, addr, dev, 1);
3948 if (!ifa) {
1b29fc2c
TG		 3949 err = -EADDRNOTAVAIL;
3950 goto errout;
3951 }
6c223828 3952
e21e8467
SH		 3953 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
3954 if (!skb) {
6c223828 3955 err = -ENOBUFS;
1b29fc2c 3956 goto errout_ifa;
6c223828
NT		 3957 }
3958
15e47304 3959 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).portid,
6c223828 3960 nlh->nlmsg_seq, RTM_NEWADDR, 0);
26932566
PM		 3961 if (err < 0) {
3962 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3963 WARN_ON(err == -EMSGSIZE);
3964 kfree_skb(skb);
3965 goto errout_ifa;
3966 }
15e47304 3967 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
1b29fc2c 3968errout_ifa:
6c223828 3969 in6_ifa_put(ifa);
1b29fc2c 3970errout:
6c223828 3971 return err;
6c223828
NT		 3972}
3973
1da177e4
LT		 3974static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
3975{
3976 struct sk_buff *skb;
c346dca1 3977 struct net *net = dev_net(ifa->idev->dev);
5d620266 3978 int err = -ENOBUFS;
1da177e4 3979
0ab6803b 3980 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
5d620266
TG		 3981 if (skb == NULL)
3982 goto errout;
3983
3984 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
26932566
PM		 3985 if (err < 0) {
3986 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3987 WARN_ON(err == -EMSGSIZE);
3988 kfree_skb(skb);
3989 goto errout;
3990 }
1ce85fe4
PNA		 3991 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
3992 return;
5d620266
TG		 3993errout:
3994 if (err < 0)
6fda7350 3995 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
1da177e4
LT		 3996}
3997
b6f99a21 3998static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
1da177e4
LT		 3999 __s32 *array, int bytes)
4000{
04561c1f
TG		 4001 BUG_ON(bytes < (DEVCONF_MAX * 4));
4002
1da177e4
LT		 4003 memset(array, 0, bytes);
4004 array[DEVCONF_FORWARDING] = cnf->forwarding;
4005 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
4006 array[DEVCONF_MTU6] = cnf->mtu6;
4007 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
4008 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
4009 array[DEVCONF_AUTOCONF] = cnf->autoconf;
4010 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
4011 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
93908d19
TG		 4012 array[DEVCONF_RTR_SOLICIT_INTERVAL] =
4013 jiffies_to_msecs(cnf->rtr_solicit_interval);
4014 array[DEVCONF_RTR_SOLICIT_DELAY] =
4015 jiffies_to_msecs(cnf->rtr_solicit_delay);
1da177e4
LT		 4016 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
4017#ifdef CONFIG_IPV6_PRIVACY
4018 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
4019 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
4020 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
4021 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
4022 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
4023#endif
4024 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
65f5c7c1 4025 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
c4fd30eb 4026 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
930d6ff2
YH		 4027#ifdef CONFIG_IPV6_ROUTER_PREF
4028 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
93908d19
TG		 4029 array[DEVCONF_RTR_PROBE_INTERVAL] =
4030 jiffies_to_msecs(cnf->rtr_probe_interval);
fa03ef38 4031#ifdef CONFIG_IPV6_ROUTE_INFO
09c884d4
YH		 4032 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
4033#endif
930d6ff2 4034#endif
fbea49e1 4035 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
0bcbc926 4036 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
95c385b4
NH		 4037#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4038 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
4039#endif
7bc570c8
YH		 4040#ifdef CONFIG_IPV6_MROUTE
4041 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
4042#endif
778d80be 4043 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
1b34be74 4044 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
c3faca05 4045 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
5cb04436 4046 array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify;
1da177e4
LT		 4047}
4048
b382b191
TG		 4049static inline size_t inet6_ifla6_size(void)
4050{
4051 return nla_total_size(4) /* IFLA_INET6_FLAGS */
4052 + nla_total_size(sizeof(struct ifla_cacheinfo))
4053 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
4054 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
4055 + nla_total_size(ICMP6_MIB_MAX * 8); /* IFLA_INET6_ICMP6STATS */
4056}
4057
339bf98f
TG		 4058static inline size_t inet6_if_nlmsg_size(void)
4059{
4060 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
4061 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
4062 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
4063 + nla_total_size(4) /* IFLA_MTU */
4064 + nla_total_size(4) /* IFLA_LINK */
b382b191 4065 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */
339bf98f 4066}
c5396a31 4067
be281e55 4068static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib,
7d720c3e 4069 int items, int bytes)
7f7d9a6b
HX		 4070{
4071 int i;
4072 int pad = bytes - sizeof(u64) * items;
4073 BUG_ON(pad < 0);
4074
4075 /* Use put_unaligned() because stats may not be aligned for u64. */
4076 put_unaligned(items, &stats[0]);
4077 for (i = 1; i < items; i++)
be281e55 4078 put_unaligned(atomic_long_read(&mib[i]), &stats[i]);
7f7d9a6b
HX		 4079
4080 memset(&stats[items], 0, pad);
4081}
4082
4ce3c183
ED		 4083static inline void __snmp6_fill_stats64(u64 *stats, void __percpu **mib,
4084 int items, int bytes, size_t syncpoff)
4085{
4086 int i;
4087 int pad = bytes - sizeof(u64) * items;
4088 BUG_ON(pad < 0);
4089
4090 /* Use put_unaligned() because stats may not be aligned for u64. */
4091 put_unaligned(items, &stats[0]);
4092 for (i = 1; i < items; i++)
4093 put_unaligned(snmp_fold_field64(mib, i, syncpoff), &stats[i]);
4094
4095 memset(&stats[items], 0, pad);
4096}
4097
7f7d9a6b
HX		 4098static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
4099 int bytes)
4100{
e21e8467 4101 switch (attrtype) {
7f7d9a6b 4102 case IFLA_INET6_STATS:
4ce3c183
ED		 4103 __snmp6_fill_stats64(stats, (void __percpu **)idev->stats.ipv6,
4104 IPSTATS_MIB_MAX, bytes, offsetof(struct ipstats_mib, syncp));
7f7d9a6b
HX		 4105 break;
4106 case IFLA_INET6_ICMP6STATS:
be281e55 4107 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, ICMP6_MIB_MAX, bytes);
7f7d9a6b
HX		 4108 break;
4109 }
4110}
4111
b382b191
TG		 4112static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev)
4113{
4114 struct nlattr *nla;
4115 struct ifla_cacheinfo ci;
4116
c78679e8
DM		 4117 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags))
4118 goto nla_put_failure;
b382b191 4119 ci.max_reasm_len = IPV6_MAXPLEN;
24912420
DM		 4120 ci.tstamp = cstamp_delta(idev->tstamp);
4121 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time);
4122 ci.retrans_time = jiffies_to_msecs(idev->nd_parms->retrans_time);
c78679e8
DM		 4123 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci))
4124 goto nla_put_failure;
b382b191
TG		 4125 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
4126 if (nla == NULL)
4127 goto nla_put_failure;
4128 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
4129
4130 /* XXX - MC not implemented */
4131
4132 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
4133 if (nla == NULL)
4134 goto nla_put_failure;
4135 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
4136
4137 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
4138 if (nla == NULL)
4139 goto nla_put_failure;
4140 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
4141
4142 return 0;
4143
4144nla_put_failure:
4145 return -EMSGSIZE;
4146}
4147
4148static size_t inet6_get_link_af_size(const struct net_device *dev)
4149{
4150 if (!__in6_dev_get(dev))
4151 return 0;
4152
4153 return inet6_ifla6_size();
4154}
4155
4156static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev)
4157{
4158 struct inet6_dev *idev = __in6_dev_get(dev);
4159
4160 if (!idev)
4161 return -ENODATA;
4162
4163 if (inet6_fill_ifla6_attrs(skb, idev) < 0)
4164 return -EMSGSIZE;
4165
4166 return 0;
4167}
4168
1ab1457c 4169static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
15e47304 4170 u32 portid, u32 seq, int event, unsigned int flags)
1da177e4 4171{
04561c1f 4172 struct net_device *dev = idev->dev;
04561c1f
TG		 4173 struct ifinfomsg *hdr;
4174 struct nlmsghdr *nlh;
4175 void *protoinfo;
04561c1f 4176
15e47304 4177 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags);
04561c1f 4178 if (nlh == NULL)
26932566 4179 return -EMSGSIZE;
04561c1f
TG		 4180
4181 hdr = nlmsg_data(nlh);
4182 hdr->ifi_family = AF_INET6;
4183 hdr->__ifi_pad = 0;
4184 hdr->ifi_type = dev->type;
4185 hdr->ifi_index = dev->ifindex;
4186 hdr->ifi_flags = dev_get_flags(dev);
4187 hdr->ifi_change = 0;
4188
c78679e8
DM		 4189 if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
4190 (dev->addr_len &&
4191 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
4192 nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
4193 (dev->ifindex != dev->iflink &&
4194 nla_put_u32(skb, IFLA_LINK, dev->iflink)))
4195 goto nla_put_failure;
04561c1f
TG		 4196 protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
4197 if (protoinfo == NULL)
4198 goto nla_put_failure;
1da177e4 4199
b382b191 4200 if (inet6_fill_ifla6_attrs(skb, idev) < 0)
bf99f1bd 4201 goto nla_put_failure;
1da177e4 4202
04561c1f
TG		 4203 nla_nest_end(skb, protoinfo);
4204 return nlmsg_end(skb, nlh);
1da177e4 4205
04561c1f 4206nla_put_failure:
26932566
PM		 4207 nlmsg_cancel(skb, nlh);
4208 return -EMSGSIZE;
1da177e4
LT		 4209}
4210
4211static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
4212{
3b1e0a65 4213 struct net *net = sock_net(skb->sk);
84d2697d 4214 int h, s_h;
434a8a58 4215 int idx = 0, s_idx;
1da177e4
LT		 4216 struct net_device *dev;
4217 struct inet6_dev *idev;
84d2697d
ED		 4218 struct hlist_head *head;
4219 struct hlist_node *node;
1da177e4 4220
84d2697d
ED		 4221 s_h = cb->args[0];
4222 s_idx = cb->args[1];
4223
4224 rcu_read_lock();
4225 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4226 idx = 0;
4227 head = &net->dev_index_head[h];
4228 hlist_for_each_entry_rcu(dev, node, head, index_hlist) {
4229 if (idx < s_idx)
4230 goto cont;
4231 idev = __in6_dev_get(dev);
4232 if (!idev)
4233 goto cont;
4234 if (inet6_fill_ifinfo(skb, idev,
15e47304 4235 NETLINK_CB(cb->skb).portid,
84d2697d
ED		 4236 cb->nlh->nlmsg_seq,
4237 RTM_NEWLINK, NLM_F_MULTI) <= 0)
4238 goto out;
7562f876 4239cont:
84d2697d
ED		 4240 idx++;
4241 }
1da177e4 4242 }
84d2697d
ED		 4243out:
4244 rcu_read_unlock();
4245 cb->args[1] = idx;
4246 cb->args[0] = h;
1da177e4
LT		 4247
4248 return skb->len;
4249}
4250
4251void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
4252{
4253 struct sk_buff *skb;
c346dca1 4254 struct net *net = dev_net(idev->dev);
8d7a76c9 4255 int err = -ENOBUFS;
1ab1457c 4256
339bf98f 4257 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
8d7a76c9
TG		 4258 if (skb == NULL)
4259 goto errout;
4260
4261 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
26932566
PM		 4262 if (err < 0) {
4263 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
4264 WARN_ON(err == -EMSGSIZE);
4265 kfree_skb(skb);
4266 goto errout;
4267 }
5f75a104 4268 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC);
1ce85fe4 4269 return;
8d7a76c9
TG		 4270errout:
4271 if (err < 0)
5f75a104 4272 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err);
1da177e4
LT		 4273}
4274
339bf98f
TG		 4275static inline size_t inet6_prefix_nlmsg_size(void)
4276{
4277 return NLMSG_ALIGN(sizeof(struct prefixmsg))
4278 + nla_total_size(sizeof(struct in6_addr))
4279 + nla_total_size(sizeof(struct prefix_cacheinfo));
4280}
c5396a31 4281
1da177e4 4282static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
15e47304 4283 struct prefix_info *pinfo, u32 portid, u32 seq,
6051e2f4 4284 int event, unsigned int flags)
1da177e4 4285{
6051e2f4
TG		 4286 struct prefixmsg *pmsg;
4287 struct nlmsghdr *nlh;
1da177e4
LT		 4288 struct prefix_cacheinfo ci;
4289
15e47304 4290 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags);
6051e2f4 4291 if (nlh == NULL)
26932566 4292 return -EMSGSIZE;
6051e2f4
TG		 4293
4294 pmsg = nlmsg_data(nlh);
1da177e4 4295 pmsg->prefix_family = AF_INET6;
8a47077a
PM		 4296 pmsg->prefix_pad1 = 0;
4297 pmsg->prefix_pad2 = 0;
1da177e4
LT		 4298 pmsg->prefix_ifindex = idev->dev->ifindex;
4299 pmsg->prefix_len = pinfo->prefix_len;
4300 pmsg->prefix_type = pinfo->type;
8a47077a 4301 pmsg->prefix_pad3 = 0;
1da177e4
LT		 4302 pmsg->prefix_flags = 0;
4303 if (pinfo->onlink)
4304 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
4305 if (pinfo->autoconf)
4306 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
4307
c78679e8
DM		 4308 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix))
4309 goto nla_put_failure;
1da177e4
LT		 4310 ci.preferred_time = ntohl(pinfo->prefered);
4311 ci.valid_time = ntohl(pinfo->valid);
c78679e8
DM		 4312 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci))
4313 goto nla_put_failure;
6051e2f4 4314 return nlmsg_end(skb, nlh);
1da177e4 4315
6051e2f4 4316nla_put_failure:
26932566
PM		 4317 nlmsg_cancel(skb, nlh);
4318 return -EMSGSIZE;
1da177e4
LT		 4319}
4320
1ab1457c 4321static void inet6_prefix_notify(int event, struct inet6_dev *idev,
1da177e4
LT		 4322 struct prefix_info *pinfo)
4323{
4324 struct sk_buff *skb;
c346dca1 4325 struct net *net = dev_net(idev->dev);
8c384bfa 4326 int err = -ENOBUFS;
1da177e4 4327
339bf98f 4328 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
8c384bfa
TG		 4329 if (skb == NULL)
4330 goto errout;
4331
4332 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
26932566
PM		 4333 if (err < 0) {
4334 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
4335 WARN_ON(err == -EMSGSIZE);
4336 kfree_skb(skb);
4337 goto errout;
4338 }
1ce85fe4
PNA		 4339 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
4340 return;
8c384bfa
TG		 4341errout:
4342 if (err < 0)
6fda7350 4343 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
1da177e4
LT		 4344}
4345
1da177e4
LT		 4346static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4347{
4348 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
4349
4350 switch (event) {
4351 case RTM_NEWADDR:
95c385b4
NH		 4352 /*
4353 * If the address was optimistic
4354 * we inserted the route at the start of
4355 * our DAD process, so we don't need
4356 * to do it again
4357 */
4358 if (!(ifp->rt->rt6i_node))
4359 ip6_ins_rt(ifp->rt);
1da177e4
LT		 4360 if (ifp->idev->cnf.forwarding)
4361 addrconf_join_anycast(ifp);
4362 break;
4363 case RTM_DELADDR:
4364 if (ifp->idev->cnf.forwarding)
4365 addrconf_leave_anycast(ifp);
4366 addrconf_leave_solict(ifp->idev, &ifp->addr);
d8d1f30b 4367 dst_hold(&ifp->rt->dst);
93fa159a 4368
73a8bd74 4369 if (ip6_del_rt(ifp->rt))
d8d1f30b 4370 dst_free(&ifp->rt->dst);
1da177e4
LT		 4371 break;
4372 }
4373}
4374
4375static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4376{
8814c4b5 4377 rcu_read_lock_bh();
1da177e4
LT		 4378 if (likely(ifp->idev->dead == 0))
4379 __ipv6_ifa_notify(event, ifp);
8814c4b5 4380 rcu_read_unlock_bh();
1da177e4
LT		 4381}
4382
4383#ifdef CONFIG_SYSCTL
4384
4385static
8d65af78 4386int addrconf_sysctl_forward(ctl_table *ctl, int write,
1da177e4
LT		 4387 void __user *buffer, size_t *lenp, loff_t *ppos)
4388{
4389 int *valp = ctl->data;
4390 int val = *valp;
88af182e 4391 loff_t pos = *ppos;
013d97e9 4392 ctl_table lctl;
1da177e4
LT		 4393 int ret;
4394
013d97e9
FR		 4395 /*
4396 * ctl->data points to idev->cnf.forwarding, we should
4397 * not modify it until we get the rtnl lock.
4398 */
4399 lctl = *ctl;
4400 lctl.data = &val;
4401
4402 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
1da177e4 4403
c8fecf22 4404 if (write)
b325fddb 4405 ret = addrconf_fixup_forwarding(ctl, valp, val);
88af182e
EB		 4406 if (ret)
4407 *ppos = pos;
1ab1457c 4408 return ret;
1da177e4
LT		 4409}
4410
56d417b1
BH		 4411static void dev_disable_change(struct inet6_dev *idev)
4412{
4413 if (!idev || !idev->dev)
4414 return;
4415
4416 if (idev->cnf.disable_ipv6)
4417 addrconf_notify(NULL, NETDEV_DOWN, idev->dev);
4418 else
4419 addrconf_notify(NULL, NETDEV_UP, idev->dev);
4420}
4421
4422static void addrconf_disable_change(struct net *net, __s32 newf)
4423{
4424 struct net_device *dev;
4425 struct inet6_dev *idev;
4426
c6d14c84
ED		 4427 rcu_read_lock();
4428 for_each_netdev_rcu(net, dev) {
56d417b1
BH		 4429 idev = __in6_dev_get(dev);
4430 if (idev) {
4431 int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
4432 idev->cnf.disable_ipv6 = newf;
4433 if (changed)
4434 dev_disable_change(idev);
4435 }
56d417b1 4436 }
c6d14c84 4437 rcu_read_unlock();
56d417b1
BH		 4438}
4439
013d97e9 4440static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf)
56d417b1
BH		 4441{
4442 struct net *net;
013d97e9
FR		 4443 int old;
4444
4445 if (!rtnl_trylock())
4446 return restart_syscall();
56d417b1
BH		 4447
4448 net = (struct net *)table->extra2;
013d97e9
FR		 4449 old = *p;
4450 *p = newf;
56d417b1 4451
013d97e9
FR		 4452 if (p == &net->ipv6.devconf_dflt->disable_ipv6) {
4453 rtnl_unlock();
56d417b1 4454 return 0;
88af182e 4455 }
56d417b1
BH		 4456
4457 if (p == &net->ipv6.devconf_all->disable_ipv6) {
56d417b1
BH		 4458 net->ipv6.devconf_dflt->disable_ipv6 = newf;
4459 addrconf_disable_change(net, newf);
013d97e9 4460 } else if ((!newf) ^ (!old))
56d417b1
BH		 4461 dev_disable_change((struct inet6_dev *)table->extra1);
4462
4463 rtnl_unlock();
4464 return 0;
4465}
4466
4467static
8d65af78 4468int addrconf_sysctl_disable(ctl_table *ctl, int write,
56d417b1
BH		 4469 void __user *buffer, size_t *lenp, loff_t *ppos)
4470{
4471 int *valp = ctl->data;
4472 int val = *valp;
88af182e 4473 loff_t pos = *ppos;
013d97e9 4474 ctl_table lctl;
56d417b1
BH		 4475 int ret;
4476
013d97e9
FR		 4477 /*
4478 * ctl->data points to idev->cnf.disable_ipv6, we should
4479 * not modify it until we get the rtnl lock.
4480 */
4481 lctl = *ctl;
4482 lctl.data = &val;
4483
4484 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
56d417b1
BH		 4485
4486 if (write)
4487 ret = addrconf_disable_ipv6(ctl, valp, val);
88af182e
EB		 4488 if (ret)
4489 *ppos = pos;
56d417b1
BH		 4490 return ret;
4491}
4492
1da177e4
LT		 4493static struct addrconf_sysctl_table
4494{
4495 struct ctl_table_header *sysctl_header;
f6a07b29 4496 ctl_table addrconf_vars[DEVCONF_MAX+1];
ab32ea5d 4497} addrconf_sysctl __read_mostly = {
1da177e4
LT		 4498 .sysctl_header = NULL,
4499 .addrconf_vars = {
1ab1457c 4500 {
e21e8467
SH		 4501 .procname = "forwarding",
4502 .data = &ipv6_devconf.forwarding,
4503 .maxlen = sizeof(int),
4504 .mode = 0644,
4505 .proc_handler = addrconf_sysctl_forward,
1da177e4
LT		 4506 },
4507 {
e21e8467
SH		 4508 .procname = "hop_limit",
4509 .data = &ipv6_devconf.hop_limit,
4510 .maxlen = sizeof(int),
4511 .mode = 0644,
4512 .proc_handler = proc_dointvec,
1da177e4
LT		 4513 },
4514 {
e21e8467
SH		 4515 .procname = "mtu",
4516 .data = &ipv6_devconf.mtu6,
4517 .maxlen = sizeof(int),
4518 .mode = 0644,
4519 .proc_handler = proc_dointvec,
1da177e4
LT		 4520 },
4521 {
e21e8467
SH		 4522 .procname = "accept_ra",
4523 .data = &ipv6_devconf.accept_ra,
4524 .maxlen = sizeof(int),
4525 .mode = 0644,
4526 .proc_handler = proc_dointvec,
1da177e4
LT		 4527 },
4528 {
e21e8467
SH		 4529 .procname = "accept_redirects",
4530 .data = &ipv6_devconf.accept_redirects,
4531 .maxlen = sizeof(int),
4532 .mode = 0644,
4533 .proc_handler = proc_dointvec,
1da177e4
LT		 4534 },
4535 {
e21e8467
SH		 4536 .procname = "autoconf",
4537 .data = &ipv6_devconf.autoconf,
4538 .maxlen = sizeof(int),
4539 .mode = 0644,
4540 .proc_handler = proc_dointvec,
1da177e4
LT		 4541 },
4542 {
e21e8467
SH		 4543 .procname = "dad_transmits",
4544 .data = &ipv6_devconf.dad_transmits,
4545 .maxlen = sizeof(int),
4546 .mode = 0644,
4547 .proc_handler = proc_dointvec,
1da177e4
LT		 4548 },
4549 {
e21e8467
SH		 4550 .procname = "router_solicitations",
4551 .data = &ipv6_devconf.rtr_solicits,
4552 .maxlen = sizeof(int),
4553 .mode = 0644,
4554 .proc_handler = proc_dointvec,
1da177e4
LT		 4555 },
4556 {
e21e8467
SH		 4557 .procname = "router_solicitation_interval",
4558 .data = &ipv6_devconf.rtr_solicit_interval,
4559 .maxlen = sizeof(int),
4560 .mode = 0644,
4561 .proc_handler = proc_dointvec_jiffies,
1da177e4
LT		 4562 },
4563 {
e21e8467
SH		 4564 .procname = "router_solicitation_delay",
4565 .data = &ipv6_devconf.rtr_solicit_delay,
4566 .maxlen = sizeof(int),
4567 .mode = 0644,
4568 .proc_handler = proc_dointvec_jiffies,
1da177e4
LT		 4569 },
4570 {
e21e8467
SH		 4571 .procname = "force_mld_version",
4572 .data = &ipv6_devconf.force_mld_version,
4573 .maxlen = sizeof(int),
4574 .mode = 0644,
4575 .proc_handler = proc_dointvec,
1da177e4
LT		 4576 },
4577#ifdef CONFIG_IPV6_PRIVACY
4578 {
e21e8467
SH		 4579 .procname = "use_tempaddr",
4580 .data = &ipv6_devconf.use_tempaddr,
4581 .maxlen = sizeof(int),
4582 .mode = 0644,
4583 .proc_handler = proc_dointvec,
1da177e4
LT		 4584 },
4585 {
e21e8467
SH		 4586 .procname = "temp_valid_lft",
4587 .data = &ipv6_devconf.temp_valid_lft,
4588 .maxlen = sizeof(int),
4589 .mode = 0644,
4590 .proc_handler = proc_dointvec,
1da177e4
LT		 4591 },
4592 {
e21e8467
SH		 4593 .procname = "temp_prefered_lft",
4594 .data = &ipv6_devconf.temp_prefered_lft,
4595 .maxlen = sizeof(int),
4596 .mode = 0644,
4597 .proc_handler = proc_dointvec,
1da177e4
LT		 4598 },
4599 {
e21e8467
SH		 4600 .procname = "regen_max_retry",
4601 .data = &ipv6_devconf.regen_max_retry,
4602 .maxlen = sizeof(int),
4603 .mode = 0644,
4604 .proc_handler = proc_dointvec,
1da177e4
LT		 4605 },
4606 {
e21e8467
SH		 4607 .procname = "max_desync_factor",
4608 .data = &ipv6_devconf.max_desync_factor,
4609 .maxlen = sizeof(int),
4610 .mode = 0644,
4611 .proc_handler = proc_dointvec,
1da177e4
LT		 4612 },
4613#endif
4614 {
e21e8467
SH		 4615 .procname = "max_addresses",
4616 .data = &ipv6_devconf.max_addresses,
4617 .maxlen = sizeof(int),
4618 .mode = 0644,
4619 .proc_handler = proc_dointvec,
1da177e4 4620 },
65f5c7c1 4621 {
e21e8467
SH		 4622 .procname = "accept_ra_defrtr",
4623 .data = &ipv6_devconf.accept_ra_defrtr,
4624 .maxlen = sizeof(int),
4625 .mode = 0644,
4626 .proc_handler = proc_dointvec,
65f5c7c1 4627 },
c4fd30eb 4628 {
e21e8467
SH		 4629 .procname = "accept_ra_pinfo",
4630 .data = &ipv6_devconf.accept_ra_pinfo,
4631 .maxlen = sizeof(int),
4632 .mode = 0644,
4633 .proc_handler = proc_dointvec,
c4fd30eb 4634 },
930d6ff2
YH		 4635#ifdef CONFIG_IPV6_ROUTER_PREF
4636 {
e21e8467
SH		 4637 .procname = "accept_ra_rtr_pref",
4638 .data = &ipv6_devconf.accept_ra_rtr_pref,
4639 .maxlen = sizeof(int),
4640 .mode = 0644,
4641 .proc_handler = proc_dointvec,
930d6ff2 4642 },
52e16356 4643 {
e21e8467
SH		 4644 .procname = "router_probe_interval",
4645 .data = &ipv6_devconf.rtr_probe_interval,
4646 .maxlen = sizeof(int),
4647 .mode = 0644,
4648 .proc_handler = proc_dointvec_jiffies,
52e16356 4649 },
fa03ef38 4650#ifdef CONFIG_IPV6_ROUTE_INFO
09c884d4 4651 {
e21e8467
SH		 4652 .procname = "accept_ra_rt_info_max_plen",
4653 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
4654 .maxlen = sizeof(int),
4655 .mode = 0644,
4656 .proc_handler = proc_dointvec,
09c884d4
YH		 4657 },
4658#endif
930d6ff2 4659#endif
fbea49e1 4660 {
e21e8467
SH		 4661 .procname = "proxy_ndp",
4662 .data = &ipv6_devconf.proxy_ndp,
4663 .maxlen = sizeof(int),
4664 .mode = 0644,
4665 .proc_handler = proc_dointvec,
fbea49e1 4666 },
0bcbc926 4667 {
e21e8467
SH		 4668 .procname = "accept_source_route",
4669 .data = &ipv6_devconf.accept_source_route,
4670 .maxlen = sizeof(int),
4671 .mode = 0644,
4672 .proc_handler = proc_dointvec,
0bcbc926 4673 },
95c385b4
NH		 4674#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4675 {
e21e8467
SH		 4676 .procname = "optimistic_dad",
4677 .data = &ipv6_devconf.optimistic_dad,
4678 .maxlen = sizeof(int),
4679 .mode = 0644,
4680 .proc_handler = proc_dointvec,
95c385b4
NH		 4681
4682 },
7bc570c8
YH		 4683#endif
4684#ifdef CONFIG_IPV6_MROUTE
4685 {
e21e8467
SH		 4686 .procname = "mc_forwarding",
4687 .data = &ipv6_devconf.mc_forwarding,
4688 .maxlen = sizeof(int),
4689 .mode = 0444,
4690 .proc_handler = proc_dointvec,
7bc570c8 4691 },
95c385b4 4692#endif
778d80be 4693 {
e21e8467
SH		 4694 .procname = "disable_ipv6",
4695 .data = &ipv6_devconf.disable_ipv6,
4696 .maxlen = sizeof(int),
4697 .mode = 0644,
4698 .proc_handler = addrconf_sysctl_disable,
778d80be 4699 },
1b34be74 4700 {
e21e8467
SH		 4701 .procname = "accept_dad",
4702 .data = &ipv6_devconf.accept_dad,
4703 .maxlen = sizeof(int),
4704 .mode = 0644,
4705 .proc_handler = proc_dointvec,
1b34be74 4706 },
f7734fdf 4707 {
f7734fdf
OP		 4708 .procname = "force_tllao",
4709 .data = &ipv6_devconf.force_tllao,
4710 .maxlen = sizeof(int),
4711 .mode = 0644,
4712 .proc_handler = proc_dointvec
4713 },
5cb04436
HFS		 4714 {
4715 .procname = "ndisc_notify",
4716 .data = &ipv6_devconf.ndisc_notify,
4717 .maxlen = sizeof(int),
4718 .mode = 0644,
4719 .proc_handler = proc_dointvec
4720 },
1da177e4 4721 {
f8572d8f 4722 /* sentinel */
1da177e4
LT		 4723 }
4724 },
1da177e4
LT		 4725};
4726
bff16c2f 4727static int __addrconf_sysctl_register(struct net *net, char *dev_name,
f8572d8f 4728 struct inet6_dev *idev, struct ipv6_devconf *p)
1da177e4
LT		 4729{
4730 int i;
1da177e4 4731 struct addrconf_sysctl_table *t;
6105e293 4732 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ];
1dab6222 4733
af879cc7 4734 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
1da177e4 4735 if (t == NULL)
f68635e6
PE		 4736 goto out;
4737
bcdd553f 4738 for (i = 0; t->addrconf_vars[i].data; i++) {
e21e8467 4739 t->addrconf_vars[i].data += (char *)p - (char *)&ipv6_devconf;
1da177e4 4740 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
bff16c2f 4741 t->addrconf_vars[i].extra2 = net;
1da177e4 4742 }
1da177e4 4743
464dc801
EB		 4744 /* Don't export sysctls to unprivileged users */
4745 if (net->user_ns != &init_user_ns)
4746 t->addrconf_vars[0].procname = NULL;
4747
6105e293 4748 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name);
1da177e4 4749
6105e293 4750 t->sysctl_header = register_net_sysctl(net, path, t->addrconf_vars);
1da177e4 4751 if (t->sysctl_header == NULL)
6105e293 4752 goto free;
f68635e6
PE		 4753
4754 p->sysctl = t;
95897312 4755 return 0;
1da177e4 4756
f68635e6 4757free:
1da177e4 4758 kfree(t);
f68635e6 4759out:
95897312 4760 return -ENOBUFS;
1da177e4
LT		 4761}
4762
408c4768
PE		 4763static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
4764{
4765 struct addrconf_sysctl_table *t;
4766
4767 if (p->sysctl == NULL)
4768 return;
4769
4770 t = p->sysctl;
4771 p->sysctl = NULL;
ff538818 4772 unregister_net_sysctl_table(t->sysctl_header);
408c4768
PE		 4773 kfree(t);
4774}
4775
f52295a9
PE		 4776static void addrconf_sysctl_register(struct inet6_dev *idev)
4777{
54716e3b 4778 neigh_sysctl_register(idev->dev, idev->nd_parms, "ipv6",
f8572d8f 4779 &ndisc_ifinfo_sysctl_change);
c346dca1 4780 __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
f8572d8f 4781 idev, &idev->cnf);
f52295a9
PE		 4782}
4783
408c4768 4784static void addrconf_sysctl_unregister(struct inet6_dev *idev)
1da177e4 4785{
408c4768
PE		 4786 __addrconf_sysctl_unregister(&idev->cnf);
4787 neigh_sysctl_unregister(idev->nd_parms);
1da177e4
LT		 4788}
4789
4790
4791#endif
4792
2c8c1e72 4793static int __net_init addrconf_init_net(struct net *net)
e0da5a48
PE		 4794{
4795 int err;
4796 struct ipv6_devconf *all, *dflt;
4797
4798 err = -ENOMEM;
4799 all = &ipv6_devconf;
4800 dflt = &ipv6_devconf_dflt;
4801
09ad9bc7 4802 if (!net_eq(net, &init_net)) {
e0da5a48
PE		 4803 all = kmemdup(all, sizeof(ipv6_devconf), GFP_KERNEL);
4804 if (all == NULL)
4805 goto err_alloc_all;
4806
4807 dflt = kmemdup(dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
4808 if (dflt == NULL)
4809 goto err_alloc_dflt;
56d417b1
BH		 4810 } else {
4811 /* these will be inherited by all namespaces */
4812 dflt->autoconf = ipv6_defaults.autoconf;
4813 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
e0da5a48
PE		 4814 }
4815
4816 net->ipv6.devconf_all = all;
4817 net->ipv6.devconf_dflt = dflt;
4818
4819#ifdef CONFIG_SYSCTL
f8572d8f 4820 err = __addrconf_sysctl_register(net, "all", NULL, all);
e0da5a48
PE		 4821 if (err < 0)
4822 goto err_reg_all;
4823
f8572d8f 4824 err = __addrconf_sysctl_register(net, "default", NULL, dflt);
e0da5a48
PE		 4825 if (err < 0)
4826 goto err_reg_dflt;
4827#endif
4828 return 0;
4829
4830#ifdef CONFIG_SYSCTL
4831err_reg_dflt:
4832 __addrconf_sysctl_unregister(all);
4833err_reg_all:
4834 kfree(dflt);
4835#endif
4836err_alloc_dflt:
4837 kfree(all);
4838err_alloc_all:
4839 return err;
4840}
4841
2c8c1e72 4842static void __net_exit addrconf_exit_net(struct net *net)
e0da5a48
PE		 4843{
4844#ifdef CONFIG_SYSCTL
4845 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
4846 __addrconf_sysctl_unregister(net->ipv6.devconf_all);
4847#endif
09ad9bc7 4848 if (!net_eq(net, &init_net)) {
e0da5a48
PE		 4849 kfree(net->ipv6.devconf_dflt);
4850 kfree(net->ipv6.devconf_all);
4851 }
4852}
4853
4854static struct pernet_operations addrconf_ops = {
4855 .init = addrconf_init_net,
4856 .exit = addrconf_exit_net,
4857};
4858
1da177e4
LT		 4859/*
4860 * Device notifier
4861 */
4862
4863int register_inet6addr_notifier(struct notifier_block *nb)
4864{
1ab1457c 4865 return atomic_notifier_chain_register(&inet6addr_chain, nb);
1da177e4 4866}
7159039a
YH		 4867EXPORT_SYMBOL(register_inet6addr_notifier);
4868
1da177e4
LT		 4869int unregister_inet6addr_notifier(struct notifier_block *nb)
4870{
e21e8467 4871 return atomic_notifier_chain_unregister(&inet6addr_chain, nb);
1da177e4 4872}
7159039a
YH		 4873EXPORT_SYMBOL(unregister_inet6addr_notifier);
4874
b382b191
TG		 4875static struct rtnl_af_ops inet6_ops = {
4876 .family = AF_INET6,
4877 .fill_link_af = inet6_fill_link_af,
4878 .get_link_af_size = inet6_get_link_af_size,
b382b191
TG		 4879};
4880
1da177e4
LT		 4881/*
4882 * Init / cleanup code
4883 */
4884
4885int __init addrconf_init(void)
4886{
c2e21293 4887 int i, err;
2a8cc6c8 4888
e21e8467
SH		 4889 err = ipv6_addr_label_init();
4890 if (err < 0) {
f3213831
JP		 4891 pr_crit("%s: cannot initialize default policy table: %d\n",
4892 __func__, err);
2cc6d2bf 4893 goto out;
2a8cc6c8 4894 }
1da177e4 4895
2cc6d2bf
NH		 4896 err = register_pernet_subsys(&addrconf_ops);
4897 if (err < 0)
4898 goto out_addrlabel;
e0da5a48 4899
1da177e4
LT		 4900 /* The addrconf netdev notifier requires that loopback_dev
4901 * has it's ipv6 private information allocated and setup
4902 * before it can bring up and give link-local addresses
4903 * to other devices which are up.
4904 *
4905 * Unfortunately, loopback_dev is not necessarily the first
4906 * entry in the global dev_base list of net devices. In fact,
4907 * it is likely to be the very last entry on that list.
4908 * So this causes the notifier registry below to try and
4909 * give link-local addresses to all devices besides loopback_dev
4910 * first, then loopback_dev, which cases all the non-loopback_dev
4911 * devices to fail to get a link-local address.
4912 *
4913 * So, as a temporary fix, allocate the ipv6 structure for
4914 * loopback_dev first by hand.
4915 * Longer term, all of the dependencies ipv6 has upon the loopback
4916 * device and it being up should be removed.
4917 */
4918 rtnl_lock();
2774c7ab 4919 if (!ipv6_add_dev(init_net.loopback_dev))
1da177e4
LT		 4920 err = -ENOMEM;
4921 rtnl_unlock();
4922 if (err)
e0da5a48 4923 goto errlo;
1da177e4 4924
c2e21293 4925 for (i = 0; i < IN6_ADDR_HSIZE; i++)
4926 INIT_HLIST_HEAD(&inet6_addr_lst[i]);
4927
1da177e4
LT		 4928 register_netdevice_notifier(&ipv6_dev_notf);
4929
1da177e4 4930 addrconf_verify(0);
c127ea2c 4931
b382b191
TG		 4932 err = rtnl_af_register(&inet6_ops);
4933 if (err < 0)
4934 goto errout_af;
4935
c7ac8679
GR		 4936 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo,
4937 NULL);
c127ea2c
TG		 4938 if (err < 0)
4939 goto errout;
4940
4941 /* Only the first call to __rtnl_register can fail */
c7ac8679
GR		 4942 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL, NULL);
4943 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL, NULL);
4944 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr,
4945 inet6_dump_ifaddr, NULL);
4946 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL,
4947 inet6_dump_ifmcaddr, NULL);
4948 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL,
4949 inet6_dump_ifacaddr, NULL);
76f8f6cb
ND		 4950 __rtnl_register(PF_INET6, RTM_GETNETCONF, inet6_netconf_get_devconf,
4951 NULL, NULL);
c127ea2c 4952
2a8cc6c8
YH		 4953 ipv6_addr_label_rtnl_register();
4954
1da177e4 4955 return 0;
c127ea2c 4956errout:
b382b191
TG		 4957 rtnl_af_unregister(&inet6_ops);
4958errout_af:
c127ea2c 4959 unregister_netdevice_notifier(&ipv6_dev_notf);
e0da5a48
PE		 4960errlo:
4961 unregister_pernet_subsys(&addrconf_ops);
2cc6d2bf
NH		 4962out_addrlabel:
4963 ipv6_addr_label_cleanup();
4964out:
c127ea2c 4965 return err;
1da177e4
LT		 4966}
4967
09f7709f 4968void addrconf_cleanup(void)
1da177e4 4969{
176c39af 4970 struct net_device *dev;
1da177e4
LT		 4971 int i;
4972
4973 unregister_netdevice_notifier(&ipv6_dev_notf);
e0da5a48 4974 unregister_pernet_subsys(&addrconf_ops);
2cc6d2bf 4975 ipv6_addr_label_cleanup();
1da177e4
LT		 4976
4977 rtnl_lock();
4978
b382b191
TG		 4979 __rtnl_af_unregister(&inet6_ops);
4980
176c39af
DL		 4981 /* clean dev list */
4982 for_each_netdev(&init_net, dev) {
4983 if (__in6_dev_get(dev) == NULL)
4984 continue;
4985 addrconf_ifdown(dev, 1);
4986 }
4987 addrconf_ifdown(init_net.loopback_dev, 2);
4988
1da177e4
LT		 4989 /*
4990 * Check hash table.
4991 */
5c578aed 4992 spin_lock_bh(&addrconf_hash_lock);
c2e21293 4993 for (i = 0; i < IN6_ADDR_HSIZE; i++)
4994 WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
5c578aed 4995 spin_unlock_bh(&addrconf_hash_lock);
1da177e4
LT		 4996
4997 del_timer(&addr_chk_timer);
1da177e4 4998 rtnl_unlock();
1da177e4 4999}
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