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rtnl/ipv6: use netconf msg to advertise forwarding status
[deliverable/linux.git] / net / ipv6 / addrconf.c
CommitLineData
1da177e4
LT		 1/*
2 * IPv6 Address [auto]configuration
3 * Linux INET6 implementation
4 *
5 * Authors:
1ab1457c 6 * Pedro Roque <roque@di.fc.ul.pt>
1da177e4
LT		 7 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
8 *
1da177e4
LT		 9 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License
11 * as published by the Free Software Foundation; either version
12 * 2 of the License, or (at your option) any later version.
13 */
14
15/*
16 * Changes:
17 *
18 * Janos Farkas : delete timer on ifdown
19 * <chexum@bankinf.banki.hu>
20 * Andi Kleen : kill double kfree on module
21 * unload.
22 * Maciej W. Rozycki : FDDI support
23 * sekiya@USAGI : Don't send too many RS
24 * packets.
25 * yoshfuji@USAGI : Fixed interval between DAD
26 * packets.
27 * YOSHIFUJI Hideaki @USAGI : improved accuracy of
28 * address validation timer.
29 * YOSHIFUJI Hideaki @USAGI : Privacy Extensions (RFC3041)
30 * support.
31 * Yuji SEKIYA @USAGI : Don't assign a same IPv6
32 * address on a same interface.
33 * YOSHIFUJI Hideaki @USAGI : ARCnet support
34 * YOSHIFUJI Hideaki @USAGI : convert /proc/net/if_inet6 to
35 * seq_file.
b1cacb68
YH		 36 * YOSHIFUJI Hideaki @USAGI : improved source address
37 * selection; consider scope,
38 * status etc.
1da177e4
LT		 39 */
40
f3213831
JP		 41#define pr_fmt(fmt) "IPv6: " fmt
42
1da177e4
LT		 43#include <linux/errno.h>
44#include <linux/types.h>
a0bffffc 45#include <linux/kernel.h>
1da177e4
LT		 46#include <linux/socket.h>
47#include <linux/sockios.h>
1da177e4
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
b077d7ab
YH		 405#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
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
469 if (type == NETCONFA_FORWARDING)
470 size += nla_total_size(4);
471
472 return size;
473}
474
475static int inet6_netconf_fill_devconf(struct sk_buff *skb, int ifindex,
476 struct ipv6_devconf *devconf, u32 portid,
477 u32 seq, int event, unsigned int flags,
478 int type)
479{
480 struct nlmsghdr *nlh;
481 struct netconfmsg *ncm;
482
483 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg),
484 flags);
485 if (nlh == NULL)
486 return -EMSGSIZE;
487
488 ncm = nlmsg_data(nlh);
489 ncm->ncm_family = AF_INET6;
490
491 if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0)
492 goto nla_put_failure;
493
494 if (type == NETCONFA_FORWARDING &&
495 nla_put_s32(skb, NETCONFA_FORWARDING, devconf->forwarding) < 0)
496 goto nla_put_failure;
497
498 return nlmsg_end(skb, nlh);
499
500nla_put_failure:
501 nlmsg_cancel(skb, nlh);
502 return -EMSGSIZE;
503}
504
505static void inet6_netconf_notify_devconf(struct net *net, int type, int ifindex,
506 struct ipv6_devconf *devconf)
507{
508 struct sk_buff *skb;
509 int err = -ENOBUFS;
510
511 skb = nlmsg_new(inet6_netconf_msgsize_devconf(type), GFP_ATOMIC);
512 if (skb == NULL)
513 goto errout;
514
515 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 0, 0,
516 RTM_NEWNETCONF, 0, type);
517 if (err < 0) {
518 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
519 WARN_ON(err == -EMSGSIZE);
520 kfree_skb(skb);
521 goto errout;
522 }
523 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_NETCONF, NULL, GFP_ATOMIC);
524 return;
525errout:
526 if (err < 0)
527 rtnl_set_sk_err(net, RTNLGRP_IPV6_NETCONF, err);
528}
529
1da177e4
LT		 530#ifdef CONFIG_SYSCTL
531static void dev_forward_change(struct inet6_dev *idev)
532{
533 struct net_device *dev;
534 struct inet6_ifaddr *ifa;
1da177e4
LT		 535
536 if (!idev)
537 return;
538 dev = idev->dev;
0187bdfb
BH		 539 if (idev->cnf.forwarding)
540 dev_disable_lro(dev);
1da177e4 541 if (dev && (dev->flags & IFF_MULTICAST)) {
1da177e4 542 if (idev->cnf.forwarding)
f3ee4010 543 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
1da177e4 544 else
f3ee4010 545 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
1da177e4 546 }
502a2ffd 547
548 list_for_each_entry(ifa, &idev->addr_list, if_list) {
2c12a74c
MW		 549 if (ifa->flags&IFA_F_TENTATIVE)
550 continue;
1da177e4
LT		 551 if (idev->cnf.forwarding)
552 addrconf_join_anycast(ifa);
553 else
554 addrconf_leave_anycast(ifa);
555 }
f3a1bfb1
ND		 556 inet6_netconf_notify_devconf(dev_net(dev), NETCONFA_FORWARDING,
557 dev->ifindex, &idev->cnf);
1da177e4
LT		 558}
559
560
e186932b 561static void addrconf_forward_change(struct net *net, __s32 newf)
1da177e4
LT		 562{
563 struct net_device *dev;
564 struct inet6_dev *idev;
565
4acd4945 566 for_each_netdev(net, dev) {
1da177e4
LT		 567 idev = __in6_dev_get(dev);
568 if (idev) {
e186932b
PE		 569 int changed = (!idev->cnf.forwarding) ^ (!newf);
570 idev->cnf.forwarding = newf;
1da177e4
LT		 571 if (changed)
572 dev_forward_change(idev);
573 }
1da177e4 574 }
1da177e4 575}
c8fecf22 576
013d97e9 577static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf)
c8fecf22 578{
bff16c2f 579 struct net *net;
013d97e9
FR		 580 int old;
581
582 if (!rtnl_trylock())
583 return restart_syscall();
bff16c2f
PE		 584
585 net = (struct net *)table->extra2;
013d97e9
FR		 586 old = *p;
587 *p = newf;
b325fddb 588
013d97e9 589 if (p == &net->ipv6.devconf_dflt->forwarding) {
f3a1bfb1
ND		 590 if ((!newf) ^ (!old))
591 inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING,
592 NETCONFA_IFINDEX_DEFAULT,
593 net->ipv6.devconf_dflt);
013d97e9
FR		 594 rtnl_unlock();
595 return 0;
88af182e 596 }
c8fecf22 597
e186932b 598 if (p == &net->ipv6.devconf_all->forwarding) {
e186932b
PE		 599 net->ipv6.devconf_dflt->forwarding = newf;
600 addrconf_forward_change(net, newf);
f3a1bfb1
ND		 601 if ((!newf) ^ (!old))
602 inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING,
603 NETCONFA_IFINDEX_ALL,
604 net->ipv6.devconf_all);
013d97e9 605 } else if ((!newf) ^ (!old))
c8fecf22 606 dev_forward_change((struct inet6_dev *)table->extra1);
0187bdfb 607 rtnl_unlock();
c8fecf22 608
013d97e9 609 if (newf)
7b4da532 610 rt6_purge_dflt_routers(net);
b325fddb 611 return 1;
c8fecf22 612}
1da177e4
LT		 613#endif
614
5c578aed 615/* Nobody refers to this ifaddr, destroy it */
1da177e4
LT		 616void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
617{
c2e21293 618 WARN_ON(!hlist_unhashed(&ifp->addr_lst));
547b792c 619
1da177e4 620#ifdef NET_REFCNT_DEBUG
91df42be 621 pr_debug("%s\n", __func__);
1da177e4
LT		 622#endif
623
624 in6_dev_put(ifp->idev);
625
626 if (del_timer(&ifp->timer))
e21e8467 627 pr_notice("Timer is still running, when freeing ifa=%p\n", ifp);
1da177e4 628
e9d3e084 629 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
f3213831 630 pr_warn("Freeing alive inet6 address %p\n", ifp);
1da177e4
LT		 631 return;
632 }
d8d1f30b 633 dst_release(&ifp->rt->dst);
1da177e4 634
e5785985 635 kfree_rcu(ifp, rcu);
1da177e4
LT		 636}
637
e55ffac6
BH		 638static void
639ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
640{
502a2ffd 641 struct list_head *p;
8a6ce0c0 642 int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
e55ffac6
BH		 643
644 /*
645 * Each device address list is sorted in order of scope -
646 * global before linklocal.
647 */
502a2ffd 648 list_for_each(p, &idev->addr_list) {
649 struct inet6_ifaddr *ifa
650 = list_entry(p, struct inet6_ifaddr, if_list);
8a6ce0c0 651 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
e55ffac6
BH		 652 break;
653 }
654
b54c9b98 655 list_add_tail(&ifp->if_list, p);
e55ffac6
BH		 656}
657
ddbe5032 658static u32 inet6_addr_hash(const struct in6_addr *addr)
3eb84f49 659{
ddbe5032 660 return hash_32(ipv6_addr_hash(addr), IN6_ADDR_HSIZE_SHIFT);
3eb84f49
YH		 661}
662
1da177e4
LT		 663/* On success it returns ifp with increased reference count */
664
665static struct inet6_ifaddr *
666ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, int pfxlen,
e431b8c0 667 int scope, u32 flags)
1da177e4
LT		 668{
669 struct inet6_ifaddr *ifa = NULL;
670 struct rt6_info *rt;
3a88a81d 671 unsigned int hash;
1da177e4 672 int err = 0;
d68b8270
YH		 673 int addr_type = ipv6_addr_type(addr);
674
675 if (addr_type == IPV6_ADDR_ANY ||
676 addr_type & IPV6_ADDR_MULTICAST ||
677 (!(idev->dev->flags & IFF_LOOPBACK) &&
678 addr_type & IPV6_ADDR_LOOPBACK))
679 return ERR_PTR(-EADDRNOTAVAIL);
1da177e4 680
8814c4b5 681 rcu_read_lock_bh();
1da177e4
LT		 682 if (idev->dead) {
683 err = -ENODEV; /*XXX*/
684 goto out2;
685 }
686
56d417b1 687 if (idev->cnf.disable_ipv6) {
9bdd8d40
BH		 688 err = -EACCES;
689 goto out2;
690 }
691
5c578aed 692 spin_lock(&addrconf_hash_lock);
1da177e4
LT		 693
694 /* Ignore adding duplicate addresses on an interface */
c346dca1 695 if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) {
1da177e4
LT		 696 ADBG(("ipv6_add_addr: already assigned\n"));
697 err = -EEXIST;
698 goto out;
699 }
700
322f74a4 701 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
1da177e4
LT		 702
703 if (ifa == NULL) {
704 ADBG(("ipv6_add_addr: malloc failed\n"));
705 err = -ENOBUFS;
706 goto out;
707 }
708
8f031519 709 rt = addrconf_dst_alloc(idev, addr, false);
1da177e4
LT		 710 if (IS_ERR(rt)) {
711 err = PTR_ERR(rt);
712 goto out;
713 }
714
4e3fd7a0 715 ifa->addr = *addr;
1da177e4
LT		 716
717 spin_lock_init(&ifa->lock);
e9d3e084 718 spin_lock_init(&ifa->state_lock);
1da177e4 719 init_timer(&ifa->timer);
c2e21293 720 INIT_HLIST_NODE(&ifa->addr_lst);
1da177e4
LT		 721 ifa->timer.data = (unsigned long) ifa;
722 ifa->scope = scope;
723 ifa->prefix_len = pfxlen;
724 ifa->flags = flags | IFA_F_TENTATIVE;
725 ifa->cstamp = ifa->tstamp = jiffies;
726
57f5f544
KF		 727 ifa->rt = rt;
728
1da177e4
LT		 729 ifa->idev = idev;
730 in6_dev_hold(idev);
731 /* For caller */
732 in6_ifa_hold(ifa);
733
734 /* Add to big hash table */
ddbe5032 735 hash = inet6_addr_hash(addr);
1da177e4 736
5c578aed 737 hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]);
5c578aed 738 spin_unlock(&addrconf_hash_lock);
1da177e4
LT		 739
740 write_lock(&idev->lock);
741 /* Add to inet6_dev unicast addr list. */
e55ffac6 742 ipv6_link_dev_addr(idev, ifa);
1da177e4
LT		 743
744#ifdef CONFIG_IPV6_PRIVACY
745 if (ifa->flags&IFA_F_TEMPORARY) {
372e6c8f 746 list_add(&ifa->tmp_list, &idev->tempaddr_list);
1da177e4
LT		 747 in6_ifa_hold(ifa);
748 }
749#endif
750
1da177e4
LT		 751 in6_ifa_hold(ifa);
752 write_unlock(&idev->lock);
753out2:
8814c4b5 754 rcu_read_unlock_bh();
1da177e4 755
fd92833a 756 if (likely(err == 0))
e041c683 757 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_UP, ifa);
1da177e4
LT		 758 else {
759 kfree(ifa);
760 ifa = ERR_PTR(err);
761 }
762
763 return ifa;
764out:
5c578aed 765 spin_unlock(&addrconf_hash_lock);
1da177e4
LT		 766 goto out2;
767}
768
769/* This function wants to get referenced ifp and releases it before return */
770
771static void ipv6_del_addr(struct inet6_ifaddr *ifp)
772{
502a2ffd 773 struct inet6_ifaddr *ifa, *ifn;
1da177e4 774 struct inet6_dev *idev = ifp->idev;
4c5ff6a6 775 int state;
1da177e4
LT		 776 int deleted = 0, onlink = 0;
777 unsigned long expires = jiffies;
778
4c5ff6a6
HX		 779 spin_lock_bh(&ifp->state_lock);
780 state = ifp->state;
e9d3e084 781 ifp->state = INET6_IFADDR_STATE_DEAD;
4c5ff6a6
HX		 782 spin_unlock_bh(&ifp->state_lock);
783
784 if (state == INET6_IFADDR_STATE_DEAD)
785 goto out;
1da177e4 786
5c578aed 787 spin_lock_bh(&addrconf_hash_lock);
788 hlist_del_init_rcu(&ifp->addr_lst);
5c578aed 789 spin_unlock_bh(&addrconf_hash_lock);
1da177e4
LT		 790
791 write_lock_bh(&idev->lock);
792#ifdef CONFIG_IPV6_PRIVACY
793 if (ifp->flags&IFA_F_TEMPORARY) {
372e6c8f 794 list_del(&ifp->tmp_list);
795 if (ifp->ifpub) {
796 in6_ifa_put(ifp->ifpub);
797 ifp->ifpub = NULL;
1da177e4 798 }
372e6c8f 799 __in6_ifa_put(ifp);
1da177e4
LT		 800 }
801#endif
802
502a2ffd 803 list_for_each_entry_safe(ifa, ifn, &idev->addr_list, if_list) {
1da177e4 804 if (ifa == ifp) {
502a2ffd 805 list_del_init(&ifp->if_list);
1da177e4 806 __in6_ifa_put(ifp);
502a2ffd 807
1da177e4
LT		 808 if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0)
809 break;
810 deleted = 1;
1d142804 811 continue;
1da177e4
LT		 812 } else if (ifp->flags & IFA_F_PERMANENT) {
813 if (ipv6_prefix_equal(&ifa->addr, &ifp->addr,
814 ifp->prefix_len)) {
815 if (ifa->flags & IFA_F_PERMANENT) {
816 onlink = 1;
817 if (deleted)
818 break;
819 } else {
820 unsigned long lifetime;
821
822 if (!onlink)
823 onlink = -1;
824
825 spin_lock(&ifa->lock);
4bed72e4
YH		 826
827 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
828 /*
829 * Note: Because this address is
830 * not permanent, lifetime <
831 * LONG_MAX / HZ here.
832 */
1da177e4
LT		 833 if (time_before(expires,
834 ifa->tstamp + lifetime * HZ))
835 expires = ifa->tstamp + lifetime * HZ;
836 spin_unlock(&ifa->lock);
837 }
838 }
839 }
840 }
841 write_unlock_bh(&idev->lock);
842
b2238566
AV		 843 addrconf_del_timer(ifp);
844
1da177e4
LT		 845 ipv6_ifa_notify(RTM_DELADDR, ifp);
846
e041c683 847 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifp);
1da177e4 848
1da177e4
LT		 849 /*
850 * Purge or update corresponding prefix
851 *
852 * 1) we don't purge prefix here if address was not permanent.
853 * prefix is managed by its own lifetime.
854 * 2) if there're no addresses, delete prefix.
855 * 3) if there're still other permanent address(es),
856 * corresponding prefix is still permanent.
857 * 4) otherwise, update prefix lifetime to the
858 * longest valid lifetime among the corresponding
859 * addresses on the device.
860 * Note: subsequent RA will update lifetime.
861 *
862 * --yoshfuji
863 */
864 if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) {
865 struct in6_addr prefix;
866 struct rt6_info *rt;
c346dca1 867 struct net *net = dev_net(ifp->idev->dev);
64c6d08e
ND		 868 struct flowi6 fl6 = {};
869
1da177e4 870 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len);
64c6d08e
ND		 871 fl6.flowi6_oif = ifp->idev->dev->ifindex;
872 fl6.daddr = prefix;
873 rt = (struct rt6_info *)ip6_route_lookup(net, &fl6,
874 RT6_LOOKUP_F_IFACE);
1da177e4 875
64c6d08e
ND		 876 if (rt != net->ipv6.ip6_null_entry &&
877 addrconf_is_prefix_route(rt)) {
1da177e4 878 if (onlink == 0) {
e0a1ad73 879 ip6_del_rt(rt);
1da177e4
LT		 880 rt = NULL;
881 } else if (!(rt->rt6i_flags & RTF_EXPIRES)) {
1716a961 882 rt6_set_expires(rt, expires);
1da177e4
LT		 883 }
884 }
d8d1f30b 885 dst_release(&rt->dst);
1da177e4
LT		 886 }
887
c3968a85
DW		 888 /* clean up prefsrc entries */
889 rt6_remove_prefsrc(ifp);
4c5ff6a6 890out:
1da177e4
LT		 891 in6_ifa_put(ifp);
892}
893
894#ifdef CONFIG_IPV6_PRIVACY
895static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
896{
897 struct inet6_dev *idev = ifp->idev;
898 struct in6_addr addr, *tmpaddr;
76f793e3 899 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_tstamp, age;
eac55bf9 900 unsigned long regen_advance;
1da177e4
LT		 901 int tmp_plen;
902 int ret = 0;
903 int max_addresses;
95c385b4 904 u32 addr_flags;
76f793e3 905 unsigned long now = jiffies;
1da177e4
LT		 906
907 write_lock(&idev->lock);
908 if (ift) {
909 spin_lock_bh(&ift->lock);
910 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
911 spin_unlock_bh(&ift->lock);
912 tmpaddr = &addr;
913 } else {
914 tmpaddr = NULL;
915 }
916retry:
917 in6_dev_hold(idev);
918 if (idev->cnf.use_tempaddr <= 0) {
919 write_unlock(&idev->lock);
f3213831 920 pr_info("%s: use_tempaddr is disabled\n", __func__);
1da177e4
LT		 921 in6_dev_put(idev);
922 ret = -1;
923 goto out;
924 }
925 spin_lock_bh(&ifp->lock);
926 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
927 idev->cnf.use_tempaddr = -1; /*XXX*/
928 spin_unlock_bh(&ifp->lock);
929 write_unlock(&idev->lock);
f3213831
JP		 930 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n",
931 __func__);
1da177e4
LT		 932 in6_dev_put(idev);
933 ret = -1;
934 goto out;
935 }
936 in6_ifa_hold(ifp);
937 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
eb7e0575 938 __ipv6_try_regen_rndid(idev, tmpaddr);
1da177e4 939 memcpy(&addr.s6_addr[8], idev->rndid, 8);
76f793e3 940 age = (now - ifp->tstamp) / HZ;
1da177e4
LT		 941 tmp_valid_lft = min_t(__u32,
942 ifp->valid_lft,
7a876b0e 943 idev->cnf.temp_valid_lft + age);
1ab1457c
YH		 944 tmp_prefered_lft = min_t(__u32,
945 ifp->prefered_lft,
7a876b0e 946 idev->cnf.temp_prefered_lft + age -
784e2710 947 idev->cnf.max_desync_factor);
1da177e4
LT		 948 tmp_plen = ifp->prefix_len;
949 max_addresses = idev->cnf.max_addresses;
1da177e4
LT		 950 tmp_tstamp = ifp->tstamp;
951 spin_unlock_bh(&ifp->lock);
952
eac55bf9
BB		 953 regen_advance = idev->cnf.regen_max_retry *
954 idev->cnf.dad_transmits *
955 idev->nd_parms->retrans_time / HZ;
1da177e4 956 write_unlock(&idev->lock);
95c385b4 957
eac55bf9
BB		 958 /* A temporary address is created only if this calculated Preferred
959 * Lifetime is greater than REGEN_ADVANCE time units. In particular,
960 * an implementation must not create a temporary address with a zero
961 * Preferred Lifetime.
962 */
963 if (tmp_prefered_lft <= regen_advance) {
964 in6_ifa_put(ifp);
965 in6_dev_put(idev);
966 ret = -1;
967 goto out;
968 }
969
95c385b4
NH		 970 addr_flags = IFA_F_TEMPORARY;
971 /* set in addrconf_prefix_rcv() */
972 if (ifp->flags & IFA_F_OPTIMISTIC)
973 addr_flags |= IFA_F_OPTIMISTIC;
974
1da177e4 975 ift = !max_addresses ||
1ab1457c 976 ipv6_count_addresses(idev) < max_addresses ?
1da177e4 977 ipv6_add_addr(idev, &addr, tmp_plen,
95c385b4
NH		 978 ipv6_addr_type(&addr)&IPV6_ADDR_SCOPE_MASK,
979 addr_flags) : NULL;
1da177e4
LT		 980 if (!ift || IS_ERR(ift)) {
981 in6_ifa_put(ifp);
982 in6_dev_put(idev);
f3213831 983 pr_info("%s: retry temporary address regeneration\n", __func__);
1da177e4
LT		 984 tmpaddr = &addr;
985 write_lock(&idev->lock);
986 goto retry;
987 }
988
989 spin_lock_bh(&ift->lock);
990 ift->ifpub = ifp;
991 ift->valid_lft = tmp_valid_lft;
992 ift->prefered_lft = tmp_prefered_lft;
76f793e3 993 ift->cstamp = now;
1da177e4
LT		 994 ift->tstamp = tmp_tstamp;
995 spin_unlock_bh(&ift->lock);
996
cf22f9a2 997 addrconf_dad_start(ift);
1da177e4
LT		 998 in6_ifa_put(ift);
999 in6_dev_put(idev);
1000out:
1001 return ret;
1002}
1003#endif
1004
1005/*
072047e4 1006 * Choose an appropriate source address (RFC3484)
1da177e4 1007 */
a9b05723
YH		 1008enum {
1009 IPV6_SADDR_RULE_INIT = 0,
1010 IPV6_SADDR_RULE_LOCAL,
1011 IPV6_SADDR_RULE_SCOPE,
1012 IPV6_SADDR_RULE_PREFERRED,
1013#ifdef CONFIG_IPV6_MIP6
1014 IPV6_SADDR_RULE_HOA,
1015#endif
1016 IPV6_SADDR_RULE_OIF,
1017 IPV6_SADDR_RULE_LABEL,
1018#ifdef CONFIG_IPV6_PRIVACY
1019 IPV6_SADDR_RULE_PRIVACY,
1020#endif
1021 IPV6_SADDR_RULE_ORCHID,
1022 IPV6_SADDR_RULE_PREFIX,
1023 IPV6_SADDR_RULE_MAX
1024};
1025
072047e4 1026struct ipv6_saddr_score {
a9b05723
YH		 1027 int rule;
1028 int addr_type;
1029 struct inet6_ifaddr *ifa;
1030 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
1031 int scopedist;
1032 int matchlen;
072047e4
YH		 1033};
1034
a9b05723 1035struct ipv6_saddr_dst {
9acd9f3a 1036 const struct in6_addr *addr;
a9b05723
YH		 1037 int ifindex;
1038 int scope;
1039 int label;
7cbca67c 1040 unsigned int prefs;
a9b05723 1041};
072047e4 1042
b6f99a21 1043static inline int ipv6_saddr_preferred(int type)
1da177e4 1044{
45bb0060 1045 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
072047e4
YH		 1046 return 1;
1047 return 0;
1da177e4
LT		 1048}
1049
3de23255
BT		 1050static int ipv6_get_saddr_eval(struct net *net,
1051 struct ipv6_saddr_score *score,
a9b05723
YH		 1052 struct ipv6_saddr_dst *dst,
1053 int i)
1054{
1055 int ret;
1056
1057 if (i <= score->rule) {
1058 switch (i) {
1059 case IPV6_SADDR_RULE_SCOPE:
1060 ret = score->scopedist;
1061 break;
1062 case IPV6_SADDR_RULE_PREFIX:
1063 ret = score->matchlen;
1064 break;
1065 default:
1066 ret = !!test_bit(i, score->scorebits);
1067 }
1068 goto out;
1069 }
1070
1071 switch (i) {
1072 case IPV6_SADDR_RULE_INIT:
1073 /* Rule 0: remember if hiscore is not ready yet */
1074 ret = !!score->ifa;
1075 break;
1076 case IPV6_SADDR_RULE_LOCAL:
1077 /* Rule 1: Prefer same address */
1078 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1079 break;
1080 case IPV6_SADDR_RULE_SCOPE:
1081 /* Rule 2: Prefer appropriate scope
1082 *
1083 * ret
1084 * ^
1085 * -1 | d 15
1086 * ---+--+-+---> scope
1087 * |
1088 * | d is scope of the destination.
1089 * B-d | \
1090 * | \ <- smaller scope is better if
1091 * B-15 | \ if scope is enough for destinaion.
1092 * | ret = B - scope (-1 <= scope >= d <= 15).
1093 * d-C-1 | /
1094 * |/ <- greater is better
1095 * -C / if scope is not enough for destination.
1096 * /| ret = scope - C (-1 <= d < scope <= 15).
1097 *
1098 * d - C - 1 < B -15 (for all -1 <= d <= 15).
1099 * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1100 * Assume B = 0 and we get C > 29.
1101 */
1102 ret = __ipv6_addr_src_scope(score->addr_type);
1103 if (ret >= dst->scope)
1104 ret = -ret;
1105 else
1106 ret -= 128; /* 30 is enough */
1107 score->scopedist = ret;
1108 break;
1109 case IPV6_SADDR_RULE_PREFERRED:
1110 /* Rule 3: Avoid deprecated and optimistic addresses */
1111 ret = ipv6_saddr_preferred(score->addr_type) ||
1112 !(score->ifa->flags & (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC));
1113 break;
1114#ifdef CONFIG_IPV6_MIP6
1115 case IPV6_SADDR_RULE_HOA:
7cbca67c 1116 {
a9b05723 1117 /* Rule 4: Prefer home address */
7cbca67c
YH		 1118 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1119 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
a9b05723 1120 break;
7cbca67c 1121 }
a9b05723
YH		 1122#endif
1123 case IPV6_SADDR_RULE_OIF:
1124 /* Rule 5: Prefer outgoing interface */
1125 ret = (!dst->ifindex ||
1126 dst->ifindex == score->ifa->idev->dev->ifindex);
1127 break;
1128 case IPV6_SADDR_RULE_LABEL:
1129 /* Rule 6: Prefer matching label */
3de23255
BT		 1130 ret = ipv6_addr_label(net,
1131 &score->ifa->addr, score->addr_type,
a9b05723
YH		 1132 score->ifa->idev->dev->ifindex) == dst->label;
1133 break;
1134#ifdef CONFIG_IPV6_PRIVACY
1135 case IPV6_SADDR_RULE_PRIVACY:
7cbca67c 1136 {
a9b05723 1137 /* Rule 7: Prefer public address
25985edc 1138 * Note: prefer temporary address if use_tempaddr >= 2
a9b05723 1139 */
7cbca67c
YH		 1140 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1141 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1142 score->ifa->idev->cnf.use_tempaddr >= 2;
1143 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
a9b05723 1144 break;
7cbca67c 1145 }
a9b05723
YH		 1146#endif
1147 case IPV6_SADDR_RULE_ORCHID:
1148 /* Rule 8-: Prefer ORCHID vs ORCHID or
1149 * non-ORCHID vs non-ORCHID
1150 */
1151 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1152 ipv6_addr_orchid(dst->addr));
1153 break;
1154 case IPV6_SADDR_RULE_PREFIX:
1155 /* Rule 8: Use longest matching prefix */
91b4b04f
YH		 1156 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr);
1157 if (ret > score->ifa->prefix_len)
1158 ret = score->ifa->prefix_len;
1159 score->matchlen = ret;
a9b05723
YH		 1160 break;
1161 default:
1162 ret = 0;
1163 }
1164
1165 if (ret)
1166 __set_bit(i, score->scorebits);
1167 score->rule = i;
1168out:
1169 return ret;
1170}
1171
b3f644fc 1172int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev,
9acd9f3a 1173 const struct in6_addr *daddr, unsigned int prefs,
7cbca67c 1174 struct in6_addr *saddr)
1da177e4 1175{
a9b05723
YH		 1176 struct ipv6_saddr_score scores[2],
1177 *score = &scores[0], *hiscore = &scores[1];
a9b05723 1178 struct ipv6_saddr_dst dst;
072047e4 1179 struct net_device *dev;
a9b05723 1180 int dst_type;
1da177e4 1181
a9b05723
YH		 1182 dst_type = __ipv6_addr_type(daddr);
1183 dst.addr = daddr;
1184 dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1185 dst.scope = __ipv6_addr_src_scope(dst_type);
3de23255 1186 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
7cbca67c 1187 dst.prefs = prefs;
a9b05723
YH		 1188
1189 hiscore->rule = -1;
1190 hiscore->ifa = NULL;
1da177e4 1191
8814c4b5 1192 rcu_read_lock();
1da177e4 1193
c6d14c84 1194 for_each_netdev_rcu(net, dev) {
072047e4 1195 struct inet6_dev *idev;
072047e4 1196
a9b05723 1197 /* Candidate Source Address (section 4)
072047e4
YH		 1198 * - multicast and link-local destination address,
1199 * the set of candidate source address MUST only
1200 * include addresses assigned to interfaces
1201 * belonging to the same link as the outgoing
1202 * interface.
1203 * (- For site-local destination addresses, the
1204 * set of candidate source addresses MUST only
1205 * include addresses assigned to interfaces
1206 * belonging to the same site as the outgoing
1207 * interface.)
1208 */
a9b05723
YH		 1209 if (((dst_type & IPV6_ADDR_MULTICAST) ||
1210 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL) &&
1211 dst.ifindex && dev->ifindex != dst.ifindex)
072047e4 1212 continue;
1da177e4 1213
1da177e4 1214 idev = __in6_dev_get(dev);
072047e4
YH		 1215 if (!idev)
1216 continue;
1217
1218 read_lock_bh(&idev->lock);
502a2ffd 1219 list_for_each_entry(score->ifa, &idev->addr_list, if_list) {
a9b05723 1220 int i;
072047e4 1221
a9b05723 1222 /*
6b3ae80a
YH		 1223 * - Tentative Address (RFC2462 section 5.4)
1224 * - A tentative address is not considered
1225 * "assigned to an interface" in the traditional
95c385b4 1226 * sense, unless it is also flagged as optimistic.
6b3ae80a 1227 * - Candidate Source Address (section 4)
072047e4
YH		 1228 * - In any case, anycast addresses, multicast
1229 * addresses, and the unspecified address MUST
1230 * NOT be included in a candidate set.
1231 */
a9b05723
YH		 1232 if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1233 (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
6b3ae80a 1234 continue;
a9b05723
YH		 1235
1236 score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1237
1238 if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1239 score->addr_type & IPV6_ADDR_MULTICAST)) {
072047e4 1240 LIMIT_NETDEBUG(KERN_DEBUG
3b6d821c 1241 "ADDRCONF: unspecified / multicast address "
072047e4
YH		 1242 "assigned as unicast address on %s",
1243 dev->name);
1244 continue;
1245 }
1246
a9b05723
YH		 1247 score->rule = -1;
1248 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1249
1250 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1251 int minihiscore, miniscore;
1252
3de23255
BT		 1253 minihiscore = ipv6_get_saddr_eval(net, hiscore, &dst, i);
1254 miniscore = ipv6_get_saddr_eval(net, score, &dst, i);
a9b05723
YH		 1255
1256 if (minihiscore > miniscore) {
1257 if (i == IPV6_SADDR_RULE_SCOPE &&
1258 score->scopedist > 0) {
1259 /*
1260 * special case:
1261 * each remaining entry
1262 * has too small (not enough)
1263 * scope, because ifa entries
1264 * are sorted by their scope
1265 * values.
1266 */
1267 goto try_nextdev;
1268 }
1269 break;
1270 } else if (minihiscore < miniscore) {
a9b05723
YH		 1271 if (hiscore->ifa)
1272 in6_ifa_put(hiscore->ifa);
1273
1274 in6_ifa_hold(score->ifa);
1275
a0bffffc 1276 swap(hiscore, score);
a9b05723
YH		 1277
1278 /* restore our iterator */
1279 score->ifa = hiscore->ifa;
1280
1281 break;
1da177e4 1282 }
072047e4 1283 }
1da177e4 1284 }
a9b05723 1285try_nextdev:
072047e4 1286 read_unlock_bh(&idev->lock);
1da177e4 1287 }
8814c4b5 1288 rcu_read_unlock();
1da177e4 1289
a9b05723 1290 if (!hiscore->ifa)
072047e4 1291 return -EADDRNOTAVAIL;
1ab1457c 1292
4e3fd7a0 1293 *saddr = hiscore->ifa->addr;
a9b05723 1294 in6_ifa_put(hiscore->ifa);
072047e4 1295 return 0;
1da177e4 1296}
5e5f3f0f 1297EXPORT_SYMBOL(ipv6_dev_get_saddr);
1da177e4 1298
95c385b4
NH		 1299int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1300 unsigned char banned_flags)
1da177e4
LT		 1301{
1302 struct inet6_dev *idev;
1303 int err = -EADDRNOTAVAIL;
1304
8814c4b5 1305 rcu_read_lock();
e21e8467
SH		 1306 idev = __in6_dev_get(dev);
1307 if (idev) {
1da177e4
LT		 1308 struct inet6_ifaddr *ifp;
1309
1310 read_lock_bh(&idev->lock);
502a2ffd 1311 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1312 if (ifp->scope == IFA_LINK &&
1313 !(ifp->flags & banned_flags)) {
4e3fd7a0 1314 *addr = ifp->addr;
1da177e4
LT		 1315 err = 0;
1316 break;
1317 }
1318 }
1319 read_unlock_bh(&idev->lock);
1320 }
8814c4b5 1321 rcu_read_unlock();
1da177e4
LT		 1322 return err;
1323}
1324
1325static int ipv6_count_addresses(struct inet6_dev *idev)
1326{
1327 int cnt = 0;
1328 struct inet6_ifaddr *ifp;
1329
1330 read_lock_bh(&idev->lock);
502a2ffd 1331 list_for_each_entry(ifp, &idev->addr_list, if_list)
1da177e4
LT		 1332 cnt++;
1333 read_unlock_bh(&idev->lock);
1334 return cnt;
1335}
1336
b71d1d42 1337int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
bfeade08 1338 struct net_device *dev, int strict)
1da177e4 1339{
eedf042a 1340 struct inet6_ifaddr *ifp;
c2e21293 1341 struct hlist_node *node;
ddbe5032 1342 unsigned int hash = inet6_addr_hash(addr);
1da177e4 1343
5c578aed 1344 rcu_read_lock_bh();
1345 hlist_for_each_entry_rcu(ifp, node, &inet6_addr_lst[hash], addr_lst) {
878628fb 1346 if (!net_eq(dev_net(ifp->idev->dev), net))
bfeade08 1347 continue;
1da177e4 1348 if (ipv6_addr_equal(&ifp->addr, addr) &&
eedf042a
SH		 1349 !(ifp->flags&IFA_F_TENTATIVE) &&
1350 (dev == NULL || ifp->idev->dev == dev ||
1351 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) {
1352 rcu_read_unlock_bh();
1353 return 1;
1da177e4
LT		 1354 }
1355 }
5c578aed 1356
eedf042a
SH		 1357 rcu_read_unlock_bh();
1358 return 0;
1da177e4 1359}
7159039a
YH		 1360EXPORT_SYMBOL(ipv6_chk_addr);
1361
3e81c6da
DM		 1362static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1363 struct net_device *dev)
1da177e4 1364{
ddbe5032 1365 unsigned int hash = inet6_addr_hash(addr);
c2e21293 1366 struct inet6_ifaddr *ifp;
1367 struct hlist_node *node;
1da177e4 1368
c2e21293 1369 hlist_for_each_entry(ifp, node, &inet6_addr_lst[hash], addr_lst) {
878628fb 1370 if (!net_eq(dev_net(ifp->idev->dev), net))
06bfe655 1371 continue;
1da177e4
LT		 1372 if (ipv6_addr_equal(&ifp->addr, addr)) {
1373 if (dev == NULL || ifp->idev->dev == dev)
3e81c6da 1374 return true;
1da177e4
LT		 1375 }
1376 }
3e81c6da 1377 return false;
1da177e4
LT		 1378}
1379
b71d1d42 1380int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev)
52eeeb84
YH		 1381{
1382 struct inet6_dev *idev;
1383 struct inet6_ifaddr *ifa;
1384 int onlink;
1385
1386 onlink = 0;
1387 rcu_read_lock();
1388 idev = __in6_dev_get(dev);
1389 if (idev) {
1390 read_lock_bh(&idev->lock);
502a2ffd 1391 list_for_each_entry(ifa, &idev->addr_list, if_list) {
52eeeb84
YH		 1392 onlink = ipv6_prefix_equal(addr, &ifa->addr,
1393 ifa->prefix_len);
1394 if (onlink)
1395 break;
1396 }
1397 read_unlock_bh(&idev->lock);
1398 }
1399 rcu_read_unlock();
1400 return onlink;
1401}
52eeeb84
YH		 1402EXPORT_SYMBOL(ipv6_chk_prefix);
1403
9acd9f3a 1404struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1cab3da6 1405 struct net_device *dev, int strict)
1da177e4 1406{
b79d1d54 1407 struct inet6_ifaddr *ifp, *result = NULL;
ddbe5032 1408 unsigned int hash = inet6_addr_hash(addr);
b79d1d54 1409 struct hlist_node *node;
1da177e4 1410
5c578aed 1411 rcu_read_lock_bh();
4f70ecca 1412 hlist_for_each_entry_rcu_bh(ifp, node, &inet6_addr_lst[hash], addr_lst) {
878628fb 1413 if (!net_eq(dev_net(ifp->idev->dev), net))
1cab3da6 1414 continue;
1da177e4
LT		 1415 if (ipv6_addr_equal(&ifp->addr, addr)) {
1416 if (dev == NULL || ifp->idev->dev == dev ||
1417 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
b79d1d54 1418 result = ifp;
1da177e4
LT		 1419 in6_ifa_hold(ifp);
1420 break;
1421 }
1422 }
1423 }
5c578aed 1424 rcu_read_unlock_bh();
1da177e4 1425
b79d1d54 1426 return result;
1da177e4
LT		 1427}
1428
1da177e4
LT		 1429/* Gets referenced address, destroys ifaddr */
1430
cc411d0b 1431static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
1da177e4 1432{
1da177e4
LT		 1433 if (ifp->flags&IFA_F_PERMANENT) {
1434 spin_lock_bh(&ifp->lock);
1435 addrconf_del_timer(ifp);
1436 ifp->flags |= IFA_F_TENTATIVE;
cc411d0b
BH		 1437 if (dad_failed)
1438 ifp->flags |= IFA_F_DADFAILED;
1da177e4 1439 spin_unlock_bh(&ifp->lock);
e2577a06
HX		 1440 if (dad_failed)
1441 ipv6_ifa_notify(0, ifp);
1da177e4
LT		 1442 in6_ifa_put(ifp);
1443#ifdef CONFIG_IPV6_PRIVACY
1444 } else if (ifp->flags&IFA_F_TEMPORARY) {
1445 struct inet6_ifaddr *ifpub;
1446 spin_lock_bh(&ifp->lock);
1447 ifpub = ifp->ifpub;
1448 if (ifpub) {
1449 in6_ifa_hold(ifpub);
1450 spin_unlock_bh(&ifp->lock);
1451 ipv6_create_tempaddr(ifpub, ifp);
1452 in6_ifa_put(ifpub);
1453 } else {
1454 spin_unlock_bh(&ifp->lock);
1455 }
1456 ipv6_del_addr(ifp);
1457#endif
1458 } else
1459 ipv6_del_addr(ifp);
1460}
1461
f2344a13
HX		 1462static int addrconf_dad_end(struct inet6_ifaddr *ifp)
1463{
1464 int err = -ENOENT;
1465
1466 spin_lock(&ifp->state_lock);
1467 if (ifp->state == INET6_IFADDR_STATE_DAD) {
1468 ifp->state = INET6_IFADDR_STATE_POSTDAD;
1469 err = 0;
1470 }
1471 spin_unlock(&ifp->state_lock);
1472
1473 return err;
1474}
1475
3c21edbd
YH		 1476void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1477{
1b34be74 1478 struct inet6_dev *idev = ifp->idev;
9bdd8d40 1479
853dc2e0
UB		 1480 if (addrconf_dad_end(ifp)) {
1481 in6_ifa_put(ifp);
f2344a13 1482 return;
853dc2e0 1483 }
f2344a13 1484
e87cc472
JP		 1485 net_info_ratelimited("%s: IPv6 duplicate address %pI6c detected!\n",
1486 ifp->idev->dev->name, &ifp->addr);
9bdd8d40 1487
1b34be74
YH		 1488 if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6) {
1489 struct in6_addr addr;
1490
1491 addr.s6_addr32[0] = htonl(0xfe800000);
1492 addr.s6_addr32[1] = 0;
1493
1494 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
1495 ipv6_addr_equal(&ifp->addr, &addr)) {
1496 /* DAD failed for link-local based on MAC address */
1497 idev->cnf.disable_ipv6 = 1;
9bdd8d40 1498
f3213831 1499 pr_info("%s: IPv6 being disabled!\n",
9bdd8d40 1500 ifp->idev->dev->name);
1b34be74
YH		 1501 }
1502 }
1503
cc411d0b 1504 addrconf_dad_stop(ifp, 1);
3c21edbd 1505}
1da177e4
LT		 1506
1507/* Join to solicited addr multicast group. */
1508
b71d1d42 1509void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr)
1da177e4
LT		 1510{
1511 struct in6_addr maddr;
1512
1513 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1514 return;
1515
1516 addrconf_addr_solict_mult(addr, &maddr);
1517 ipv6_dev_mc_inc(dev, &maddr);
1518}
1519
b71d1d42 1520void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr)
1da177e4
LT		 1521{
1522 struct in6_addr maddr;
1523
1524 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1525 return;
1526
1527 addrconf_addr_solict_mult(addr, &maddr);
1528 __ipv6_dev_mc_dec(idev, &maddr);
1529}
1530
20380731 1531static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1da177e4
LT		 1532{
1533 struct in6_addr addr;
2bda8a0c
BM		 1534 if (ifp->prefix_len == 127) /* RFC 6164 */
1535 return;
1da177e4
LT		 1536 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1537 if (ipv6_addr_any(&addr))
1538 return;
1539 ipv6_dev_ac_inc(ifp->idev->dev, &addr);
1540}
1541
20380731 1542static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1da177e4
LT		 1543{
1544 struct in6_addr addr;
32019e65
YH		 1545 if (ifp->prefix_len == 127) /* RFC 6164 */
1546 return;
1da177e4
LT		 1547 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1548 if (ipv6_addr_any(&addr))
1549 return;
1550 __ipv6_dev_ac_dec(ifp->idev, &addr);
1551}
1552
073a8e0e
YH		 1553static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
1554{
1555 if (dev->addr_len != ETH_ALEN)
1556 return -1;
1557 memcpy(eui, dev->dev_addr, 3);
1558 memcpy(eui + 5, dev->dev_addr + 3, 3);
1559
1560 /*
1561 * The zSeries OSA network cards can be shared among various
1562 * OS instances, but the OSA cards have only one MAC address.
1563 * This leads to duplicate address conflicts in conjunction
1564 * with IPv6 if more than one instance uses the same card.
1565 *
1566 * The driver for these cards can deliver a unique 16-bit
1567 * identifier for each instance sharing the same card. It is
1568 * placed instead of 0xFFFE in the interface identifier. The
1569 * "u" bit of the interface identifier is not inverted in this
1570 * case. Hence the resulting interface identifier has local
1571 * scope according to RFC2373.
1572 */
1573 if (dev->dev_id) {
1574 eui[3] = (dev->dev_id >> 8) & 0xFF;
1575 eui[4] = dev->dev_id & 0xFF;
1576 } else {
1577 eui[3] = 0xFF;
1578 eui[4] = 0xFE;
1579 eui[0] ^= 2;
1580 }
1581 return 0;
1582}
1583
06a4c1c5 1584static int addrconf_ifid_eui64(u8 *eui, struct net_device *dev)
1585{
1586 if (dev->addr_len != IEEE802154_ADDR_LEN)
1587 return -1;
1588 memcpy(eui, dev->dev_addr, 8);
1589 return 0;
1590}
1591
073a8e0e
YH		 1592static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1593{
1594 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1595 if (dev->addr_len != ARCNET_ALEN)
1596 return -1;
1597 memset(eui, 0, 7);
8e5e8f30 1598 eui[7] = *(u8 *)dev->dev_addr;
073a8e0e
YH		 1599 return 0;
1600}
1601
1602static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1603{
1604 if (dev->addr_len != INFINIBAND_ALEN)
1605 return -1;
1606 memcpy(eui, dev->dev_addr + 12, 8);
1607 eui[0] |= 2;
1608 return 0;
1609}
1610
c61393ea 1611static int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
dfd982ba 1612{
9af28511
SH		 1613 if (addr == 0)
1614 return -1;
dfd982ba
YH		 1615 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
1616 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
1617 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
1618 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
1619 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
1620 ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
1621 eui[1] = 0;
1622 eui[2] = 0x5E;
1623 eui[3] = 0xFE;
1624 memcpy(eui + 4, &addr, 4);
1625 return 0;
1626}
dfd982ba
YH		 1627
1628static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
1629{
1630 if (dev->priv_flags & IFF_ISATAP)
1631 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1632 return -1;
1633}
1634
aee80b54 1635static int addrconf_ifid_gre(u8 *eui, struct net_device *dev)
1636{
1637 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1638}
1639
1da177e4
LT		 1640static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1641{
1642 switch (dev->type) {
1643 case ARPHRD_ETHER:
1644 case ARPHRD_FDDI:
073a8e0e 1645 return addrconf_ifid_eui48(eui, dev);
1da177e4 1646 case ARPHRD_ARCNET:
073a8e0e 1647 return addrconf_ifid_arcnet(eui, dev);
1da177e4 1648 case ARPHRD_INFINIBAND:
073a8e0e 1649 return addrconf_ifid_infiniband(eui, dev);
c7dc89c0 1650 case ARPHRD_SIT:
dfd982ba 1651 return addrconf_ifid_sit(eui, dev);
aee80b54 1652 case ARPHRD_IPGRE:
1653 return addrconf_ifid_gre(eui, dev);
06a4c1c5 1654 case ARPHRD_IEEE802154:
1655 return addrconf_ifid_eui64(eui, dev);
1da177e4
LT		 1656 }
1657 return -1;
1658}
1659
1660static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1661{
1662 int err = -1;
1663 struct inet6_ifaddr *ifp;
1664
1665 read_lock_bh(&idev->lock);
502a2ffd 1666 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1da177e4
LT		 1667 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1668 memcpy(eui, ifp->addr.s6_addr+8, 8);
1669 err = 0;
1670 break;
1671 }
1672 }
1673 read_unlock_bh(&idev->lock);
1674 return err;
1675}
1676
1677#ifdef CONFIG_IPV6_PRIVACY
1678/* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
eb7e0575 1679static void __ipv6_regen_rndid(struct inet6_dev *idev)
1da177e4 1680{
1da177e4 1681regen:
955189ef 1682 get_random_bytes(idev->rndid, sizeof(idev->rndid));
1da177e4 1683 idev->rndid[0] &= ~0x02;
1da177e4
LT		 1684
1685 /*
1686 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1687 * check if generated address is not inappropriate
1688 *
1689 * - Reserved subnet anycast (RFC 2526)
1690 * 11111101 11....11 1xxxxxxx
c7dc89c0 1691 * - ISATAP (RFC4214) 6.1
1da177e4
LT		 1692 * 00-00-5E-FE-xx-xx-xx-xx
1693 * - value 0
1694 * - XXX: already assigned to an address on the device
1695 */
1ab1457c 1696 if (idev->rndid[0] == 0xfd &&
1da177e4
LT		 1697 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1698 (idev->rndid[7]&0x80))
1699 goto regen;
1700 if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1701 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1702 goto regen;
1703 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1704 goto regen;
1705 }
1da177e4
LT		 1706}
1707
1708static void ipv6_regen_rndid(unsigned long data)
1709{
1710 struct inet6_dev *idev = (struct inet6_dev *) data;
1711 unsigned long expires;
1712
8814c4b5 1713 rcu_read_lock_bh();
1da177e4
LT		 1714 write_lock_bh(&idev->lock);
1715
1716 if (idev->dead)
1717 goto out;
1718
eb7e0575 1719 __ipv6_regen_rndid(idev);
1ab1457c 1720
1da177e4 1721 expires = jiffies +
1ab1457c 1722 idev->cnf.temp_prefered_lft * HZ -
784e2710
BH		 1723 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time -
1724 idev->cnf.max_desync_factor * HZ;
1da177e4 1725 if (time_before(expires, jiffies)) {
f3213831
JP		 1726 pr_warn("%s: too short regeneration interval; timer disabled for %s\n",
1727 __func__, idev->dev->name);
1da177e4
LT		 1728 goto out;
1729 }
1730
1731 if (!mod_timer(&idev->regen_timer, expires))
1732 in6_dev_hold(idev);
1733
1734out:
1735 write_unlock_bh(&idev->lock);
8814c4b5 1736 rcu_read_unlock_bh();
1da177e4
LT		 1737 in6_dev_put(idev);
1738}
1739
eb7e0575 1740static void __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr)
8e5e8f30 1741{
1da177e4 1742 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
eb7e0575 1743 __ipv6_regen_rndid(idev);
1da177e4
LT		 1744}
1745#endif
1746
1747/*
1748 * Add prefix route.
1749 */
1750
1751static void
1752addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
e431b8c0 1753 unsigned long expires, u32 flags)
1da177e4 1754{
86872cb5
TG		 1755 struct fib6_config cfg = {
1756 .fc_table = RT6_TABLE_PREFIX,
1757 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1758 .fc_ifindex = dev->ifindex,
1759 .fc_expires = expires,
1760 .fc_dst_len = plen,
1761 .fc_flags = RTF_UP | flags,
c346dca1 1762 .fc_nlinfo.nl_net = dev_net(dev),
f410a1fb 1763 .fc_protocol = RTPROT_KERNEL,
86872cb5 1764 };
1da177e4 1765
4e3fd7a0 1766 cfg.fc_dst = *pfx;
1da177e4
LT		 1767
1768 /* Prevent useless cloning on PtP SIT.
1769 This thing is done here expecting that the whole
1770 class of non-broadcast devices need not cloning.
1771 */
0be669bb 1772#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
86872cb5
TG		 1773 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
1774 cfg.fc_flags |= RTF_NONEXTHOP;
0be669bb 1775#endif
1da177e4 1776
86872cb5 1777 ip6_route_add(&cfg);
1da177e4
LT		 1778}
1779
14ef37b6
AH		 1780
1781static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
1782 int plen,
1783 const struct net_device *dev,
1784 u32 flags, u32 noflags)
1785{
1786 struct fib6_node *fn;
1787 struct rt6_info *rt = NULL;
1788 struct fib6_table *table;
1789
1790 table = fib6_get_table(dev_net(dev), RT6_TABLE_PREFIX);
1791 if (table == NULL)
1792 return NULL;
1793
5744dd9b 1794 read_lock_bh(&table->tb6_lock);
14ef37b6
AH		 1795 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0);
1796 if (!fn)
1797 goto out;
1798 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
d1918542 1799 if (rt->dst.dev->ifindex != dev->ifindex)
14ef37b6
AH		 1800 continue;
1801 if ((rt->rt6i_flags & flags) != flags)
1802 continue;
1803 if ((noflags != 0) && ((rt->rt6i_flags & flags) != 0))
1804 continue;
1805 dst_hold(&rt->dst);
1806 break;
1807 }
1808out:
5744dd9b 1809 read_unlock_bh(&table->tb6_lock);
14ef37b6
AH		 1810 return rt;
1811}
1812
1813
1da177e4
LT		 1814/* Create "default" multicast route to the interface */
1815
1816static void addrconf_add_mroute(struct net_device *dev)
1817{
86872cb5
TG		 1818 struct fib6_config cfg = {
1819 .fc_table = RT6_TABLE_LOCAL,
1820 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1821 .fc_ifindex = dev->ifindex,
1822 .fc_dst_len = 8,
1823 .fc_flags = RTF_UP,
c346dca1 1824 .fc_nlinfo.nl_net = dev_net(dev),
86872cb5
TG		 1825 };
1826
1827 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
1828
1829 ip6_route_add(&cfg);
1da177e4
LT		 1830}
1831
0be669bb 1832#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1da177e4
LT		 1833static void sit_route_add(struct net_device *dev)
1834{
86872cb5
TG		 1835 struct fib6_config cfg = {
1836 .fc_table = RT6_TABLE_MAIN,
1837 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1838 .fc_ifindex = dev->ifindex,
1839 .fc_dst_len = 96,
1840 .fc_flags = RTF_UP | RTF_NONEXTHOP,
c346dca1 1841 .fc_nlinfo.nl_net = dev_net(dev),
86872cb5 1842 };
1da177e4
LT		 1843
1844 /* prefix length - 96 bits "::d.d.d.d" */
86872cb5 1845 ip6_route_add(&cfg);
1da177e4 1846}
0be669bb 1847#endif
1da177e4 1848
1da177e4
LT		 1849static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
1850{
1851 struct inet6_dev *idev;
1852
1853 ASSERT_RTNL();
1854
e21e8467
SH		 1855 idev = ipv6_find_idev(dev);
1856 if (!idev)
64e724f6
BH		 1857 return ERR_PTR(-ENOBUFS);
1858
1859 if (idev->cnf.disable_ipv6)
1860 return ERR_PTR(-EACCES);
1da177e4
LT		 1861
1862 /* Add default multicast route */
4af04aba
LW		 1863 if (!(dev->flags & IFF_LOOPBACK))
1864 addrconf_add_mroute(dev);
1da177e4 1865
1da177e4
LT		 1866 return idev;
1867}
1868
e6bff995 1869void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao)
1da177e4
LT		 1870{
1871 struct prefix_info *pinfo;
1872 __u32 valid_lft;
1873 __u32 prefered_lft;
1874 int addr_type;
1da177e4 1875 struct inet6_dev *in6_dev;
56d417b1 1876 struct net *net = dev_net(dev);
1da177e4
LT		 1877
1878 pinfo = (struct prefix_info *) opt;
1ab1457c 1879
1da177e4
LT		 1880 if (len < sizeof(struct prefix_info)) {
1881 ADBG(("addrconf: prefix option too short\n"));
1882 return;
1883 }
1ab1457c 1884
1da177e4
LT		 1885 /*
1886 * Validation checks ([ADDRCONF], page 19)
1887 */
1888
1889 addr_type = ipv6_addr_type(&pinfo->prefix);
1890
1891 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
1892 return;
1893
1894 valid_lft = ntohl(pinfo->valid);
1895 prefered_lft = ntohl(pinfo->prefered);
1896
1897 if (prefered_lft > valid_lft) {
e87cc472 1898 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n");
1da177e4
LT		 1899 return;
1900 }
1901
1902 in6_dev = in6_dev_get(dev);
1903
1904 if (in6_dev == NULL) {
e87cc472
JP		 1905 net_dbg_ratelimited("addrconf: device %s not configured\n",
1906 dev->name);
1da177e4
LT		 1907 return;
1908 }
1909
1910 /*
1911 * Two things going on here:
1912 * 1) Add routes for on-link prefixes
1913 * 2) Configure prefixes with the auto flag set
1914 */
1915
4bed72e4
YH		 1916 if (pinfo->onlink) {
1917 struct rt6_info *rt;
1918 unsigned long rt_expires;
1919
6f704992
YH		 1920 /* Avoid arithmetic overflow. Really, we could
1921 * save rt_expires in seconds, likely valid_lft,
1922 * but it would require division in fib gc, that it
1923 * not good.
1924 */
4bed72e4
YH		 1925 if (HZ > USER_HZ)
1926 rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
1927 else
1928 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
3dd4bc68 1929
4bed72e4
YH		 1930 if (addrconf_finite_timeout(rt_expires))
1931 rt_expires *= HZ;
1da177e4 1932
14ef37b6
AH		 1933 rt = addrconf_get_prefix_route(&pinfo->prefix,
1934 pinfo->prefix_len,
1935 dev,
1936 RTF_ADDRCONF | RTF_PREFIX_RT,
1937 RTF_GATEWAY | RTF_DEFAULT);
1da177e4 1938
14ef37b6 1939 if (rt) {
6f704992
YH		 1940 /* Autoconf prefix route */
1941 if (valid_lft == 0) {
1942 ip6_del_rt(rt);
1943 rt = NULL;
4bed72e4 1944 } else if (addrconf_finite_timeout(rt_expires)) {
6f704992 1945 /* not infinity */
1716a961 1946 rt6_set_expires(rt, jiffies + rt_expires);
6f704992 1947 } else {
1716a961 1948 rt6_clean_expires(rt);
1da177e4
LT		 1949 }
1950 } else if (valid_lft) {
6f704992 1951 clock_t expires = 0;
4bed72e4
YH		 1952 int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
1953 if (addrconf_finite_timeout(rt_expires)) {
6f704992
YH		 1954 /* not infinity */
1955 flags |= RTF_EXPIRES;
1956 expires = jiffies_to_clock_t(rt_expires);
1957 }
1da177e4 1958 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
6f704992 1959 dev, expires, flags);
1da177e4
LT		 1960 }
1961 if (rt)
d8d1f30b 1962 dst_release(&rt->dst);
1da177e4
LT		 1963 }
1964
1965 /* Try to figure out our local address for this prefix */
1966
1967 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
8e5e8f30 1968 struct inet6_ifaddr *ifp;
1da177e4
LT		 1969 struct in6_addr addr;
1970 int create = 0, update_lft = 0;
1971
1972 if (pinfo->prefix_len == 64) {
1973 memcpy(&addr, &pinfo->prefix, 8);
1974 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
1975 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
1976 in6_dev_put(in6_dev);
1977 return;
1978 }
1979 goto ok;
1980 }
e87cc472
JP		 1981 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n",
1982 pinfo->prefix_len);
1da177e4
LT		 1983 in6_dev_put(in6_dev);
1984 return;
1985
1986ok:
1987
53b7997f 1988 ifp = ipv6_get_ifaddr(net, &addr, dev, 1);
1da177e4
LT		 1989
1990 if (ifp == NULL && valid_lft) {
1991 int max_addresses = in6_dev->cnf.max_addresses;
95c385b4
NH		 1992 u32 addr_flags = 0;
1993
1994#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1995 if (in6_dev->cnf.optimistic_dad &&
e6bff995 1996 !net->ipv6.devconf_all->forwarding && sllao)
95c385b4
NH		 1997 addr_flags = IFA_F_OPTIMISTIC;
1998#endif
1da177e4
LT		 1999
2000 /* Do not allow to create too much of autoconfigured
2001 * addresses; this would be too easy way to crash kernel.
2002 */
2003 if (!max_addresses ||
2004 ipv6_count_addresses(in6_dev) < max_addresses)
2005 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len,
95c385b4
NH		 2006 addr_type&IPV6_ADDR_SCOPE_MASK,
2007 addr_flags);
1da177e4
LT		 2008
2009 if (!ifp || IS_ERR(ifp)) {
2010 in6_dev_put(in6_dev);
2011 return;
2012 }
2013
2014 update_lft = create = 1;
2015 ifp->cstamp = jiffies;
cf22f9a2 2016 addrconf_dad_start(ifp);
1da177e4
LT		 2017 }
2018
2019 if (ifp) {
2020 int flags;
2021 unsigned long now;
2022#ifdef CONFIG_IPV6_PRIVACY
2023 struct inet6_ifaddr *ift;
2024#endif
2025 u32 stored_lft;
2026
2027 /* update lifetime (RFC2462 5.5.3 e) */
2028 spin_lock(&ifp->lock);
2029 now = jiffies;
2030 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
2031 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
2032 else
2033 stored_lft = 0;
2034 if (!update_lft && stored_lft) {
2035 if (valid_lft > MIN_VALID_LIFETIME ||
2036 valid_lft > stored_lft)
2037 update_lft = 1;
2038 else if (stored_lft <= MIN_VALID_LIFETIME) {
2039 /* valid_lft <= stored_lft is always true */
a1ed0526
BH		 2040 /*
2041 * RFC 4862 Section 5.5.3e:
2042 * "Note that the preferred lifetime of
2043 * the corresponding address is always
2044 * reset to the Preferred Lifetime in
2045 * the received Prefix Information
2046 * option, regardless of whether the
2047 * valid lifetime is also reset or
2048 * ignored."
2049 *
2050 * So if the preferred lifetime in
2051 * this advertisement is different
2052 * than what we have stored, but the
2053 * valid lifetime is invalid, just
2054 * reset prefered_lft.
2055 *
2056 * We must set the valid lifetime
2057 * to the stored lifetime since we'll
2058 * be updating the timestamp below,
2059 * else we'll set it back to the
25985edc 2060 * minimum.
a1ed0526
BH		 2061 */
2062 if (prefered_lft != ifp->prefered_lft) {
2063 valid_lft = stored_lft;
2064 update_lft = 1;
2065 }
1da177e4
LT		 2066 } else {
2067 valid_lft = MIN_VALID_LIFETIME;
2068 if (valid_lft < prefered_lft)
2069 prefered_lft = valid_lft;
2070 update_lft = 1;
2071 }
2072 }
2073
2074 if (update_lft) {
2075 ifp->valid_lft = valid_lft;
2076 ifp->prefered_lft = prefered_lft;
2077 ifp->tstamp = now;
2078 flags = ifp->flags;
2079 ifp->flags &= ~IFA_F_DEPRECATED;
2080 spin_unlock(&ifp->lock);
2081
2082 if (!(flags&IFA_F_TENTATIVE))
2083 ipv6_ifa_notify(0, ifp);
2084 } else
2085 spin_unlock(&ifp->lock);
2086
2087#ifdef CONFIG_IPV6_PRIVACY
2088 read_lock_bh(&in6_dev->lock);
2089 /* update all temporary addresses in the list */
76f793e3
LC		 2090 list_for_each_entry(ift, &in6_dev->tempaddr_list,
2091 tmp_list) {
2092 int age, max_valid, max_prefered;
2093
c6fbfac2
BB		 2094 if (ifp != ift->ifpub)
2095 continue;
2096
76f793e3
LC		 2097 /*
2098 * RFC 4941 section 3.3:
2099 * If a received option will extend the lifetime
2100 * of a public address, the lifetimes of
2101 * temporary addresses should be extended,
2102 * subject to the overall constraint that no
2103 * temporary addresses should ever remain
2104 * "valid" or "preferred" for a time longer than
2105 * (TEMP_VALID_LIFETIME) or
2106 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR),
2107 * respectively.
2108 */
2109 age = (now - ift->cstamp) / HZ;
2110 max_valid = in6_dev->cnf.temp_valid_lft - age;
2111 if (max_valid < 0)
2112 max_valid = 0;
2113
2114 max_prefered = in6_dev->cnf.temp_prefered_lft -
2115 in6_dev->cnf.max_desync_factor -
2116 age;
2117 if (max_prefered < 0)
2118 max_prefered = 0;
2119
2120 if (valid_lft > max_valid)
2121 valid_lft = max_valid;
2122
2123 if (prefered_lft > max_prefered)
2124 prefered_lft = max_prefered;
2125
1da177e4
LT		 2126 spin_lock(&ift->lock);
2127 flags = ift->flags;
76f793e3
LC		 2128 ift->valid_lft = valid_lft;
2129 ift->prefered_lft = prefered_lft;
2130 ift->tstamp = now;
2131 if (prefered_lft > 0)
2132 ift->flags &= ~IFA_F_DEPRECATED;
2133
1da177e4
LT		 2134 spin_unlock(&ift->lock);
2135 if (!(flags&IFA_F_TENTATIVE))
2136 ipv6_ifa_notify(0, ift);
2137 }
2138
aed65501 2139 if ((create || list_empty(&in6_dev->tempaddr_list)) && in6_dev->cnf.use_tempaddr > 0) {
1da177e4 2140 /*
76f793e3
LC		 2141 * When a new public address is created as
2142 * described in [ADDRCONF], also create a new
2143 * temporary address. Also create a temporary
2144 * address if it's enabled but no temporary
2145 * address currently exists.
1da177e4 2146 */
1ab1457c 2147 read_unlock_bh(&in6_dev->lock);
1da177e4
LT		 2148 ipv6_create_tempaddr(ifp, NULL);
2149 } else {
2150 read_unlock_bh(&in6_dev->lock);
2151 }
2152#endif
2153 in6_ifa_put(ifp);
2154 addrconf_verify(0);
2155 }
2156 }
2157 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
2158 in6_dev_put(in6_dev);
2159}
2160
2161/*
2162 * Set destination address.
2163 * Special case for SIT interfaces where we create a new "virtual"
2164 * device.
2165 */
af284937 2166int addrconf_set_dstaddr(struct net *net, void __user *arg)
1da177e4
LT		 2167{
2168 struct in6_ifreq ireq;
2169 struct net_device *dev;
2170 int err = -EINVAL;
2171
2172 rtnl_lock();
2173
2174 err = -EFAULT;
2175 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2176 goto err_exit;
2177
af284937 2178 dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
1da177e4
LT		 2179
2180 err = -ENODEV;
2181 if (dev == NULL)
2182 goto err_exit;
2183
0be669bb 2184#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1da177e4 2185 if (dev->type == ARPHRD_SIT) {
5bc3eb7e 2186 const struct net_device_ops *ops = dev->netdev_ops;
1da177e4 2187 struct ifreq ifr;
1da177e4
LT		 2188 struct ip_tunnel_parm p;
2189
2190 err = -EADDRNOTAVAIL;
2191 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2192 goto err_exit;
2193
2194 memset(&p, 0, sizeof(p));
2195 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2196 p.iph.saddr = 0;
2197 p.iph.version = 4;
2198 p.iph.ihl = 5;
2199 p.iph.protocol = IPPROTO_IPV6;
2200 p.iph.ttl = 64;
d20b3109 2201 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
1da177e4 2202
5bc3eb7e
SH		 2203 if (ops->ndo_do_ioctl) {
2204 mm_segment_t oldfs = get_fs();
2205
2206 set_fs(KERNEL_DS);
2207 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2208 set_fs(oldfs);
2209 } else
2210 err = -EOPNOTSUPP;
1da177e4
LT		 2211
2212 if (err == 0) {
2213 err = -ENOBUFS;
af284937
DL		 2214 dev = __dev_get_by_name(net, p.name);
2215 if (!dev)
1da177e4
LT		 2216 goto err_exit;
2217 err = dev_open(dev);
2218 }
2219 }
0be669bb 2220#endif
1da177e4
LT		 2221
2222err_exit:
2223 rtnl_unlock();
2224 return err;
2225}
2226
2227/*
2228 * Manual configuration of address on an interface
2229 */
b71d1d42 2230static int inet6_addr_add(struct net *net, int ifindex, const struct in6_addr *pfx,
24ef0da7 2231 unsigned int plen, __u8 ifa_flags, __u32 prefered_lft,
af284937 2232 __u32 valid_lft)
1da177e4
LT		 2233{
2234 struct inet6_ifaddr *ifp;
2235 struct inet6_dev *idev;
2236 struct net_device *dev;
2237 int scope;
6f704992
YH		 2238 u32 flags;
2239 clock_t expires;
4bed72e4 2240 unsigned long timeout;
1da177e4
LT		 2241
2242 ASSERT_RTNL();
1ab1457c 2243
24ef0da7
TG		 2244 if (plen > 128)
2245 return -EINVAL;
2246
0778769d
NT		 2247 /* check the lifetime */
2248 if (!valid_lft || prefered_lft > valid_lft)
2249 return -EINVAL;
2250
af284937
DL		 2251 dev = __dev_get_by_index(net, ifindex);
2252 if (!dev)
1da177e4 2253 return -ENODEV;
1ab1457c 2254
64e724f6
BH		 2255 idev = addrconf_add_dev(dev);
2256 if (IS_ERR(idev))
2257 return PTR_ERR(idev);
1da177e4
LT		 2258
2259 scope = ipv6_addr_scope(pfx);
2260
4bed72e4
YH		 2261 timeout = addrconf_timeout_fixup(valid_lft, HZ);
2262 if (addrconf_finite_timeout(timeout)) {
2263 expires = jiffies_to_clock_t(timeout * HZ);
2264 valid_lft = timeout;
6f704992 2265 flags = RTF_EXPIRES;
4bed72e4
YH		 2266 } else {
2267 expires = 0;
2268 flags = 0;
2269 ifa_flags |= IFA_F_PERMANENT;
6f704992 2270 }
0778769d 2271
4bed72e4
YH		 2272 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
2273 if (addrconf_finite_timeout(timeout)) {
2274 if (timeout == 0)
2275 ifa_flags |= IFA_F_DEPRECATED;
2276 prefered_lft = timeout;
2277 }
0778769d
NT		 2278
2279 ifp = ipv6_add_addr(idev, pfx, plen, scope, ifa_flags);
2280
1da177e4 2281 if (!IS_ERR(ifp)) {
06aebfb7 2282 spin_lock_bh(&ifp->lock);
0778769d
NT		 2283 ifp->valid_lft = valid_lft;
2284 ifp->prefered_lft = prefered_lft;
2285 ifp->tstamp = jiffies;
06aebfb7 2286 spin_unlock_bh(&ifp->lock);
0778769d 2287
46d48046 2288 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
6f704992 2289 expires, flags);
95c385b4
NH		 2290 /*
2291 * Note that section 3.1 of RFC 4429 indicates
2292 * that the Optimistic flag should not be set for
2293 * manually configured addresses
2294 */
cf22f9a2 2295 addrconf_dad_start(ifp);
1da177e4 2296 in6_ifa_put(ifp);
0778769d 2297 addrconf_verify(0);
1da177e4
LT		 2298 return 0;
2299 }
2300
2301 return PTR_ERR(ifp);
2302}
2303
b71d1d42 2304static int inet6_addr_del(struct net *net, int ifindex, const struct in6_addr *pfx,
24ef0da7 2305 unsigned int plen)
1da177e4
LT		 2306{
2307 struct inet6_ifaddr *ifp;
2308 struct inet6_dev *idev;
2309 struct net_device *dev;
1ab1457c 2310
24ef0da7
TG		 2311 if (plen > 128)
2312 return -EINVAL;
2313
af284937
DL		 2314 dev = __dev_get_by_index(net, ifindex);
2315 if (!dev)
1da177e4
LT		 2316 return -ENODEV;
2317
2318 if ((idev = __in6_dev_get(dev)) == NULL)
2319 return -ENXIO;
2320
2321 read_lock_bh(&idev->lock);
502a2ffd 2322 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1da177e4
LT		 2323 if (ifp->prefix_len == plen &&
2324 ipv6_addr_equal(pfx, &ifp->addr)) {
2325 in6_ifa_hold(ifp);
2326 read_unlock_bh(&idev->lock);
1ab1457c 2327
1da177e4
LT		 2328 ipv6_del_addr(ifp);
2329
2330 /* If the last address is deleted administratively,
2331 disable IPv6 on this interface.
2332 */
502a2ffd 2333 if (list_empty(&idev->addr_list))
1da177e4
LT		 2334 addrconf_ifdown(idev->dev, 1);
2335 return 0;
2336 }
2337 }
2338 read_unlock_bh(&idev->lock);
2339 return -EADDRNOTAVAIL;
2340}
2341
2342
af284937 2343int addrconf_add_ifaddr(struct net *net, void __user *arg)
1da177e4
LT		 2344{
2345 struct in6_ifreq ireq;
2346 int err;
1ab1457c 2347
1da177e4
LT		 2348 if (!capable(CAP_NET_ADMIN))
2349 return -EPERM;
1ab1457c 2350
1da177e4
LT		 2351 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2352 return -EFAULT;
2353
2354 rtnl_lock();
af284937
DL		 2355 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2356 ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2357 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
1da177e4
LT		 2358 rtnl_unlock();
2359 return err;
2360}
2361
af284937 2362int addrconf_del_ifaddr(struct net *net, void __user *arg)
1da177e4
LT		 2363{
2364 struct in6_ifreq ireq;
2365 int err;
1ab1457c 2366
1da177e4
LT		 2367 if (!capable(CAP_NET_ADMIN))
2368 return -EPERM;
2369
2370 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2371 return -EFAULT;
2372
2373 rtnl_lock();
af284937
DL		 2374 err = inet6_addr_del(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2375 ireq.ifr6_prefixlen);
1da177e4
LT		 2376 rtnl_unlock();
2377 return err;
2378}
2379
b5f348e5
IJ		 2380static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
2381 int plen, int scope)
2382{
2383 struct inet6_ifaddr *ifp;
2384
2385 ifp = ipv6_add_addr(idev, addr, plen, scope, IFA_F_PERMANENT);
2386 if (!IS_ERR(ifp)) {
2387 spin_lock_bh(&ifp->lock);
2388 ifp->flags &= ~IFA_F_TENTATIVE;
2389 spin_unlock_bh(&ifp->lock);
2390 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2391 in6_ifa_put(ifp);
2392 }
2393}
2394
0be669bb 2395#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1da177e4
LT		 2396static void sit_add_v4_addrs(struct inet6_dev *idev)
2397{
1da177e4
LT		 2398 struct in6_addr addr;
2399 struct net_device *dev;
c346dca1 2400 struct net *net = dev_net(idev->dev);
1da177e4
LT		 2401 int scope;
2402
2403 ASSERT_RTNL();
2404
2405 memset(&addr, 0, sizeof(struct in6_addr));
2406 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2407
2408 if (idev->dev->flags&IFF_POINTOPOINT) {
2409 addr.s6_addr32[0] = htonl(0xfe800000);
2410 scope = IFA_LINK;
2411 } else {
2412 scope = IPV6_ADDR_COMPATv4;
2413 }
2414
2415 if (addr.s6_addr32[3]) {
b5f348e5 2416 add_addr(idev, &addr, 128, scope);
1da177e4
LT		 2417 return;
2418 }
2419
6fda7350 2420 for_each_netdev(net, dev) {
8e5e8f30 2421 struct in_device *in_dev = __in_dev_get_rtnl(dev);
1da177e4 2422 if (in_dev && (dev->flags & IFF_UP)) {
8e5e8f30 2423 struct in_ifaddr *ifa;
1da177e4
LT		 2424
2425 int flag = scope;
2426
2427 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2428 int plen;
2429
2430 addr.s6_addr32[3] = ifa->ifa_local;
2431
2432 if (ifa->ifa_scope == RT_SCOPE_LINK)
2433 continue;
2434 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2435 if (idev->dev->flags&IFF_POINTOPOINT)
2436 continue;
2437 flag |= IFA_HOST;
2438 }
2439 if (idev->dev->flags&IFF_POINTOPOINT)
2440 plen = 64;
2441 else
2442 plen = 96;
2443
b5f348e5 2444 add_addr(idev, &addr, plen, flag);
1da177e4
LT		 2445 }
2446 }
1ab1457c 2447 }
1da177e4 2448}
0be669bb 2449#endif
1da177e4
LT		 2450
2451static void init_loopback(struct net_device *dev)
2452{
2453 struct inet6_dev *idev;
1da177e4
LT		 2454
2455 /* ::1 */
2456
2457 ASSERT_RTNL();
2458
2459 if ((idev = ipv6_find_idev(dev)) == NULL) {
91df42be 2460 pr_debug("%s: add_dev failed\n", __func__);
1da177e4
LT		 2461 return;
2462 }
2463
b5f348e5 2464 add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
1da177e4
LT		 2465}
2466
b71d1d42 2467static void addrconf_add_linklocal(struct inet6_dev *idev, const struct in6_addr *addr)
1da177e4 2468{
8e5e8f30 2469 struct inet6_ifaddr *ifp;
95c385b4
NH		 2470 u32 addr_flags = IFA_F_PERMANENT;
2471
2472#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2473 if (idev->cnf.optimistic_dad &&
702beb87 2474 !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
95c385b4
NH		 2475 addr_flags |= IFA_F_OPTIMISTIC;
2476#endif
1da177e4 2477
95c385b4
NH		 2478
2479 ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, addr_flags);
1da177e4 2480 if (!IS_ERR(ifp)) {
46d48046 2481 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
cf22f9a2 2482 addrconf_dad_start(ifp);
1da177e4
LT		 2483 in6_ifa_put(ifp);
2484 }
2485}
2486
2487static void addrconf_dev_config(struct net_device *dev)
2488{
2489 struct in6_addr addr;
8e5e8f30 2490 struct inet6_dev *idev;
1da177e4
LT		 2491
2492 ASSERT_RTNL();
2493
74235a25
HX		 2494 if ((dev->type != ARPHRD_ETHER) &&
2495 (dev->type != ARPHRD_FDDI) &&
74235a25 2496 (dev->type != ARPHRD_ARCNET) &&
06a4c1c5 2497 (dev->type != ARPHRD_INFINIBAND) &&
2498 (dev->type != ARPHRD_IEEE802154)) {
74235a25
HX		 2499 /* Alas, we support only Ethernet autoconfiguration. */
2500 return;
2501 }
2502
1da177e4 2503 idev = addrconf_add_dev(dev);
64e724f6 2504 if (IS_ERR(idev))
1da177e4
LT		 2505 return;
2506
2507 memset(&addr, 0, sizeof(struct in6_addr));
2508 addr.s6_addr32[0] = htonl(0xFE800000);
2509
2510 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
2511 addrconf_add_linklocal(idev, &addr);
2512}
2513
0be669bb 2514#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1da177e4
LT		 2515static void addrconf_sit_config(struct net_device *dev)
2516{
2517 struct inet6_dev *idev;
2518
2519 ASSERT_RTNL();
2520
1ab1457c
YH		 2521 /*
2522 * Configure the tunnel with one of our IPv4
2523 * addresses... we should configure all of
1da177e4
LT		 2524 * our v4 addrs in the tunnel
2525 */
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
c7dc89c0
FT		 2532 if (dev->priv_flags & IFF_ISATAP) {
2533 struct in6_addr addr;
2534
2535 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
2536 addrconf_prefix_route(&addr, 64, dev, 0, 0);
2537 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2538 addrconf_add_linklocal(idev, &addr);
2539 return;
2540 }
2541
1da177e4
LT		 2542 sit_add_v4_addrs(idev);
2543
62b54dd9 2544 if (dev->flags&IFF_POINTOPOINT)
1da177e4 2545 addrconf_add_mroute(dev);
62b54dd9 2546 else
1da177e4
LT		 2547 sit_route_add(dev);
2548}
0be669bb 2549#endif
1da177e4 2550
aee80b54 2551#if defined(CONFIG_NET_IPGRE) || defined(CONFIG_NET_IPGRE_MODULE)
2552static void addrconf_gre_config(struct net_device *dev)
2553{
2554 struct inet6_dev *idev;
2555 struct in6_addr addr;
2556
f3213831 2557 pr_info("%s(%s)\n", __func__, dev->name);
aee80b54 2558
2559 ASSERT_RTNL();
2560
2561 if ((idev = ipv6_find_idev(dev)) == NULL) {
91df42be 2562 pr_debug("%s: add_dev failed\n", __func__);
aee80b54 2563 return;
2564 }
2565
2566 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
2567 addrconf_prefix_route(&addr, 64, dev, 0, 0);
2568
2569 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2570 addrconf_add_linklocal(idev, &addr);
2571}
2572#endif
2573
1da177e4
LT		 2574static inline int
2575ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev)
2576{
2577 struct in6_addr lladdr;
2578
95c385b4 2579 if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) {
1da177e4
LT		 2580 addrconf_add_linklocal(idev, &lladdr);
2581 return 0;
2582 }
2583 return -1;
2584}
2585
2586static void ip6_tnl_add_linklocal(struct inet6_dev *idev)
2587{
2588 struct net_device *link_dev;
c346dca1 2589 struct net *net = dev_net(idev->dev);
1da177e4
LT		 2590
2591 /* first try to inherit the link-local address from the link device */
2592 if (idev->dev->iflink &&
6fda7350 2593 (link_dev = __dev_get_by_index(net, idev->dev->iflink))) {
1da177e4
LT		 2594 if (!ipv6_inherit_linklocal(idev, link_dev))
2595 return;
2596 }
2597 /* then try to inherit it from any device */
6fda7350 2598 for_each_netdev(net, link_dev) {
1da177e4
LT		 2599 if (!ipv6_inherit_linklocal(idev, link_dev))
2600 return;
2601 }
91df42be 2602 pr_debug("init ip6-ip6: add_linklocal failed\n");
1da177e4
LT		 2603}
2604
2605/*
2606 * Autoconfigure tunnel with a link-local address so routing protocols,
2607 * DHCPv6, MLD etc. can be run over the virtual link
2608 */
2609
2610static void addrconf_ip6_tnl_config(struct net_device *dev)
2611{
2612 struct inet6_dev *idev;
2613
2614 ASSERT_RTNL();
2615
e21e8467 2616 idev = addrconf_add_dev(dev);
64e724f6 2617 if (IS_ERR(idev)) {
91df42be 2618 pr_debug("init ip6-ip6: add_dev failed\n");
1da177e4
LT		 2619 return;
2620 }
2621 ip6_tnl_add_linklocal(idev);
1da177e4
LT		 2622}
2623
1ab1457c 2624static int addrconf_notify(struct notifier_block *this, unsigned long event,
8e5e8f30 2625 void *data)
1da177e4
LT		 2626{
2627 struct net_device *dev = (struct net_device *) data;
748e2d93 2628 struct inet6_dev *idev = __in6_dev_get(dev);
c5e33bdd 2629 int run_pending = 0;
b217d616 2630 int err;
1da177e4 2631
e21e8467 2632 switch (event) {
45ba9dd2 2633 case NETDEV_REGISTER:
74235a25 2634 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
45ba9dd2
YH		 2635 idev = ipv6_add_dev(dev);
2636 if (!idev)
b217d616 2637 return notifier_from_errno(-ENOMEM);
45ba9dd2
YH		 2638 }
2639 break;
bcdd553f 2640
1da177e4 2641 case NETDEV_UP:
3c21edbd 2642 case NETDEV_CHANGE:
c2edacf8
JV		 2643 if (dev->flags & IFF_SLAVE)
2644 break;
2645
3c21edbd 2646 if (event == NETDEV_UP) {
f24e3d65 2647 if (!addrconf_qdisc_ok(dev)) {
3c21edbd 2648 /* device is not ready yet. */
f3213831 2649 pr_info("ADDRCONF(NETDEV_UP): %s: link is not ready\n",
3c21edbd
YH		 2650 dev->name);
2651 break;
2652 }
99081049 2653
d31c7b8f
EP		 2654 if (!idev && dev->mtu >= IPV6_MIN_MTU)
2655 idev = ipv6_add_dev(dev);
2656
e3ec6cfc 2657 if (idev) {
99081049 2658 idev->if_flags |= IF_READY;
e3ec6cfc
BT		 2659 run_pending = 1;
2660 }
3c21edbd 2661 } else {
f24e3d65 2662 if (!addrconf_qdisc_ok(dev)) {
3c21edbd
YH		 2663 /* device is still not ready. */
2664 break;
2665 }
2666
2667 if (idev) {
bcdd553f 2668 if (idev->if_flags & IF_READY)
3c21edbd
YH		 2669 /* device is already configured. */
2670 break;
3c21edbd
YH		 2671 idev->if_flags |= IF_READY;
2672 }
2673
f3213831
JP		 2674 pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n",
2675 dev->name);
3c21edbd 2676
c5e33bdd 2677 run_pending = 1;
3c21edbd
YH		 2678 }
2679
e21e8467 2680 switch (dev->type) {
0be669bb 2681#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1da177e4
LT		 2682 case ARPHRD_SIT:
2683 addrconf_sit_config(dev);
2684 break;
aee80b54 2685#endif
2686#if defined(CONFIG_NET_IPGRE) || defined(CONFIG_NET_IPGRE_MODULE)
2687 case ARPHRD_IPGRE:
2688 addrconf_gre_config(dev);
2689 break;
0be669bb 2690#endif
1da177e4
LT		 2691 case ARPHRD_TUNNEL6:
2692 addrconf_ip6_tnl_config(dev);
2693 break;
2694 case ARPHRD_LOOPBACK:
2695 init_loopback(dev);
2696 break;
2697
2698 default:
2699 addrconf_dev_config(dev);
2700 break;
3ff50b79 2701 }
bcdd553f 2702
1da177e4 2703 if (idev) {
c5e33bdd
YH		 2704 if (run_pending)
2705 addrconf_dad_run(idev);
2706
bcdd553f
SH		 2707 /*
2708 * If the MTU changed during the interface down,
2709 * when the interface up, the changed MTU must be
2710 * reflected in the idev as well as routers.
1da177e4 2711 */
bcdd553f
SH		 2712 if (idev->cnf.mtu6 != dev->mtu &&
2713 dev->mtu >= IPV6_MIN_MTU) {
1da177e4
LT		 2714 rt6_mtu_change(dev, dev->mtu);
2715 idev->cnf.mtu6 = dev->mtu;
2716 }
2717 idev->tstamp = jiffies;
2718 inet6_ifinfo_notify(RTM_NEWLINK, idev);
bcdd553f
SH		 2719
2720 /*
2721 * If the changed mtu during down is lower than
2722 * IPV6_MIN_MTU stop IPv6 on this interface.
1da177e4
LT		 2723 */
2724 if (dev->mtu < IPV6_MIN_MTU)
bcdd553f 2725 addrconf_ifdown(dev, 1);
1da177e4
LT		 2726 }
2727 break;
2728
2729 case NETDEV_CHANGEMTU:
d31c7b8f 2730 if (idev && dev->mtu >= IPV6_MIN_MTU) {
1da177e4
LT		 2731 rt6_mtu_change(dev, dev->mtu);
2732 idev->cnf.mtu6 = dev->mtu;
2733 break;
2734 }
2735
d31c7b8f
EP		 2736 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2737 idev = ipv6_add_dev(dev);
2738 if (idev)
2739 break;
2740 }
2741
bcdd553f
SH		 2742 /*
2743 * MTU falled under IPV6_MIN_MTU.
2744 * Stop IPv6 on this interface.
2745 */
1da177e4
LT		 2746
2747 case NETDEV_DOWN:
2748 case NETDEV_UNREGISTER:
2749 /*
2750 * Remove all addresses from this interface.
2751 */
2752 addrconf_ifdown(dev, event != NETDEV_DOWN);
2753 break;
3c21edbd 2754
1da177e4 2755 case NETDEV_CHANGENAME:
1da177e4 2756 if (idev) {
5632c515 2757 snmp6_unregister_dev(idev);
408c4768 2758 addrconf_sysctl_unregister(idev);
f52295a9 2759 addrconf_sysctl_register(idev);
b217d616
HX		 2760 err = snmp6_register_dev(idev);
2761 if (err)
2762 return notifier_from_errno(err);
5632c515 2763 }
1da177e4 2764 break;
bcdd553f 2765
93d9b7d7
JP		 2766 case NETDEV_PRE_TYPE_CHANGE:
2767 case NETDEV_POST_TYPE_CHANGE:
2768 addrconf_type_change(dev, event);
75c78500 2769 break;
3ff50b79 2770 }
1da177e4
LT		 2771
2772 return NOTIFY_OK;
2773}
2774
2775/*
2776 * addrconf module should be notified of a device going up
2777 */
2778static struct notifier_block ipv6_dev_notf = {
2779 .notifier_call = addrconf_notify,
1da177e4
LT		 2780};
2781
93d9b7d7 2782static void addrconf_type_change(struct net_device *dev, unsigned long event)
75c78500
MS		 2783{
2784 struct inet6_dev *idev;
2785 ASSERT_RTNL();
2786
2787 idev = __in6_dev_get(dev);
2788
93d9b7d7 2789 if (event == NETDEV_POST_TYPE_CHANGE)
75c78500 2790 ipv6_mc_remap(idev);
93d9b7d7 2791 else if (event == NETDEV_PRE_TYPE_CHANGE)
75c78500
MS		 2792 ipv6_mc_unmap(idev);
2793}
2794
1da177e4
LT		 2795static int addrconf_ifdown(struct net_device *dev, int how)
2796{
c346dca1 2797 struct net *net = dev_net(dev);
502a2ffd 2798 struct inet6_dev *idev;
2799 struct inet6_ifaddr *ifa;
73a8bd74 2800 int state, i;
1da177e4
LT		 2801
2802 ASSERT_RTNL();
2803
73a8bd74
DM		 2804 rt6_ifdown(net, dev);
2805 neigh_ifdown(&nd_tbl, dev);
1da177e4
LT		 2806
2807 idev = __in6_dev_get(dev);
2808 if (idev == NULL)
2809 return -ENODEV;
2810
bcdd553f
SH		 2811 /*
2812 * Step 1: remove reference to ipv6 device from parent device.
2813 * Do not dev_put!
1da177e4 2814 */
439e2385 2815 if (how) {
1da177e4 2816 idev->dead = 1;
8814c4b5
YH		 2817
2818 /* protected by rtnl_lock */
a9b3cd7f 2819 RCU_INIT_POINTER(dev->ip6_ptr, NULL);
1da177e4
LT		 2820
2821 /* Step 1.5: remove snmp6 entry */
2822 snmp6_unregister_dev(idev);
2823
2824 }
2825
73a8bd74
DM		 2826 /* Step 2: clear hash table */
2827 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
2828 struct hlist_head *h = &inet6_addr_lst[i];
2829 struct hlist_node *n;
2830
2831 spin_lock_bh(&addrconf_hash_lock);
2832 restart:
2833 hlist_for_each_entry_rcu(ifa, n, h, addr_lst) {
2834 if (ifa->idev == idev) {
2835 hlist_del_init_rcu(&ifa->addr_lst);
2836 addrconf_del_timer(ifa);
2837 goto restart;
2838 }
2839 }
2840 spin_unlock_bh(&addrconf_hash_lock);
2841 }
2842
1da177e4
LT		 2843 write_lock_bh(&idev->lock);
2844
bcdd553f 2845 /* Step 2: clear flags for stateless addrconf */
439e2385 2846 if (!how)
3c21edbd 2847 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
1da177e4 2848
1da177e4 2849#ifdef CONFIG_IPV6_PRIVACY
439e2385 2850 if (how && del_timer(&idev->regen_timer))
1da177e4
LT		 2851 in6_dev_put(idev);
2852
bcdd553f 2853 /* Step 3: clear tempaddr list */
372e6c8f 2854 while (!list_empty(&idev->tempaddr_list)) {
2855 ifa = list_first_entry(&idev->tempaddr_list,
2856 struct inet6_ifaddr, tmp_list);
2857 list_del(&ifa->tmp_list);
1da177e4
LT		 2858 write_unlock_bh(&idev->lock);
2859 spin_lock_bh(&ifa->lock);
2860
2861 if (ifa->ifpub) {
2862 in6_ifa_put(ifa->ifpub);
2863 ifa->ifpub = NULL;
2864 }
2865 spin_unlock_bh(&ifa->lock);
2866 in6_ifa_put(ifa);
2867 write_lock_bh(&idev->lock);
2868 }
2869#endif
8f37ada5 2870
502a2ffd 2871 while (!list_empty(&idev->addr_list)) {
2872 ifa = list_first_entry(&idev->addr_list,
2873 struct inet6_ifaddr, if_list);
84e8b803 2874 addrconf_del_timer(ifa);
2875
73a8bd74 2876 list_del(&ifa->if_list);
84e8b803 2877
73a8bd74 2878 write_unlock_bh(&idev->lock);
84e8b803 2879
73a8bd74
DM		 2880 spin_lock_bh(&ifa->state_lock);
2881 state = ifa->state;
2882 ifa->state = INET6_IFADDR_STATE_DEAD;
2883 spin_unlock_bh(&ifa->state_lock);
9d82ca98 2884
73a8bd74
DM		 2885 if (state != INET6_IFADDR_STATE_DEAD) {
2886 __ipv6_ifa_notify(RTM_DELADDR, ifa);
2887 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifa);
27bdb2ab 2888 }
73a8bd74 2889 in6_ifa_put(ifa);
8f37ada5 2890
73a8bd74
DM		 2891 write_lock_bh(&idev->lock);
2892 }
8f37ada5 2893
1da177e4
LT		 2894 write_unlock_bh(&idev->lock);
2895
2896 /* Step 5: Discard multicast list */
439e2385 2897 if (how)
1da177e4
LT		 2898 ipv6_mc_destroy_dev(idev);
2899 else
2900 ipv6_mc_down(idev);
2901
1da177e4 2902 idev->tstamp = jiffies;
1ab1457c 2903
bcdd553f 2904 /* Last: Shot the device (if unregistered) */
439e2385 2905 if (how) {
408c4768 2906 addrconf_sysctl_unregister(idev);
1da177e4
LT		 2907 neigh_parms_release(&nd_tbl, idev->nd_parms);
2908 neigh_ifdown(&nd_tbl, dev);
2909 in6_dev_put(idev);
2910 }
2911 return 0;
2912}
2913
2914static void addrconf_rs_timer(unsigned long data)
2915{
2916 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
5b2a1953 2917 struct inet6_dev *idev = ifp->idev;
1da177e4 2918
5b2a1953 2919 read_lock(&idev->lock);
2920 if (idev->dead || !(idev->if_flags & IF_READY))
1da177e4
LT		 2921 goto out;
2922
5b2a1953 2923 if (idev->cnf.forwarding)
2924 goto out;
2925
2926 /* Announcement received after solicitation was sent */
2927 if (idev->if_flags & IF_RA_RCVD)
1da177e4 2928 goto out;
1da177e4
LT		 2929
2930 spin_lock(&ifp->lock);
5b2a1953 2931 if (ifp->probes++ < idev->cnf.rtr_solicits) {
1da177e4
LT		 2932 /* The wait after the last probe can be shorter */
2933 addrconf_mod_timer(ifp, AC_RS,
5b2a1953 2934 (ifp->probes == idev->cnf.rtr_solicits) ?
2935 idev->cnf.rtr_solicit_delay :
2936 idev->cnf.rtr_solicit_interval);
1da177e4
LT		 2937 spin_unlock(&ifp->lock);
2938
5b2a1953 2939 ndisc_send_rs(idev->dev, &ifp->addr, &in6addr_linklocal_allrouters);
1da177e4
LT		 2940 } else {
2941 spin_unlock(&ifp->lock);
2942 /*
2943 * Note: we do not support deprecated "all on-link"
2944 * assumption any longer.
2945 */
91df42be 2946 pr_debug("%s: no IPv6 routers present\n", idev->dev->name);
1da177e4
LT		 2947 }
2948
2949out:
5b2a1953 2950 read_unlock(&idev->lock);
1da177e4
LT		 2951 in6_ifa_put(ifp);
2952}
2953
2954/*
2955 * Duplicate Address Detection
2956 */
3c21edbd
YH		 2957static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
2958{
2959 unsigned long rand_num;
2960 struct inet6_dev *idev = ifp->idev;
2961
95c385b4
NH		 2962 if (ifp->flags & IFA_F_OPTIMISTIC)
2963 rand_num = 0;
2964 else
2965 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1);
2966
3c21edbd
YH		 2967 ifp->probes = idev->cnf.dad_transmits;
2968 addrconf_mod_timer(ifp, AC_DAD, rand_num);
2969}
2970
cf22f9a2 2971static void addrconf_dad_start(struct inet6_ifaddr *ifp)
1da177e4
LT		 2972{
2973 struct inet6_dev *idev = ifp->idev;
2974 struct net_device *dev = idev->dev;
1da177e4
LT		 2975
2976 addrconf_join_solict(dev, &ifp->addr);
2977
1da177e4 2978 net_srandom(ifp->addr.s6_addr32[3]);
1da177e4
LT		 2979
2980 read_lock_bh(&idev->lock);
622ccdf1 2981 spin_lock(&ifp->lock);
e9d3e084 2982 if (ifp->state == INET6_IFADDR_STATE_DEAD)
1da177e4 2983 goto out;
1da177e4
LT		 2984
2985 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
1b34be74 2986 idev->cnf.accept_dad < 1 ||
55ebaef1
NT		 2987 !(ifp->flags&IFA_F_TENTATIVE) ||
2988 ifp->flags & IFA_F_NODAD) {
cc411d0b 2989 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
21809faf 2990 spin_unlock(&ifp->lock);
1da177e4
LT		 2991 read_unlock_bh(&idev->lock);
2992
2993 addrconf_dad_completed(ifp);
2994 return;
2995 }
2996
6732bade 2997 if (!(idev->if_flags & IF_READY)) {
21809faf 2998 spin_unlock(&ifp->lock);
6732bade 2999 read_unlock_bh(&idev->lock);
3c21edbd 3000 /*
590a9887 3001 * If the device is not ready:
3c21edbd
YH		 3002 * - keep it tentative if it is a permanent address.
3003 * - otherwise, kill it.
3004 */
3005 in6_ifa_hold(ifp);
cc411d0b 3006 addrconf_dad_stop(ifp, 0);
6732bade 3007 return;
3c21edbd 3008 }
95c385b4
NH		 3009
3010 /*
3011 * Optimistic nodes can start receiving
3012 * Frames right away
3013 */
e21e8467 3014 if (ifp->flags & IFA_F_OPTIMISTIC)
95c385b4
NH		 3015 ip6_ins_rt(ifp->rt);
3016
6732bade 3017 addrconf_dad_kick(ifp);
1da177e4 3018out:
622ccdf1 3019 spin_unlock(&ifp->lock);
1da177e4
LT		 3020 read_unlock_bh(&idev->lock);
3021}
3022
3023static void addrconf_dad_timer(unsigned long data)
3024{
3025 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
3026 struct inet6_dev *idev = ifp->idev;
1da177e4
LT		 3027 struct in6_addr mcaddr;
3028
f2344a13
HX		 3029 if (!ifp->probes && addrconf_dad_end(ifp))
3030 goto out;
3031
122e4519 3032 read_lock(&idev->lock);
3033 if (idev->dead || !(idev->if_flags & IF_READY)) {
3034 read_unlock(&idev->lock);
1da177e4
LT		 3035 goto out;
3036 }
21809faf 3037
3038 spin_lock(&ifp->lock);
622ccdf1
HX		 3039 if (ifp->state == INET6_IFADDR_STATE_DEAD) {
3040 spin_unlock(&ifp->lock);
3041 read_unlock(&idev->lock);
3042 goto out;
3043 }
3044
1da177e4
LT		 3045 if (ifp->probes == 0) {
3046 /*
3047 * DAD was successful
3048 */
3049
cc411d0b 3050 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
21809faf 3051 spin_unlock(&ifp->lock);
122e4519 3052 read_unlock(&idev->lock);
1da177e4
LT		 3053
3054 addrconf_dad_completed(ifp);
3055
3056 goto out;
3057 }
3058
3059 ifp->probes--;
3060 addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time);
21809faf 3061 spin_unlock(&ifp->lock);
122e4519 3062 read_unlock(&idev->lock);
1da177e4
LT		 3063
3064 /* send a neighbour solicitation for our addr */
1da177e4 3065 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
d7aabf22 3066 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &in6addr_any);
1da177e4
LT		 3067out:
3068 in6_ifa_put(ifp);
3069}
3070
3071static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
3072{
e21e8467 3073 struct net_device *dev = ifp->idev->dev;
1da177e4
LT		 3074
3075 /*
3076 * Configure the address for reception. Now it is valid.
3077 */
3078
3079 ipv6_ifa_notify(RTM_NEWADDR, ifp);
3080
026359bc
TA		 3081 /* If added prefix is link local and we are prepared to process
3082 router advertisements, start sending router solicitations.
1da177e4
LT		 3083 */
3084
026359bc
TA		 3085 if (((ifp->idev->cnf.accept_ra == 1 && !ifp->idev->cnf.forwarding) ||
3086 ifp->idev->cnf.accept_ra == 2) &&
1da177e4
LT		 3087 ifp->idev->cnf.rtr_solicits > 0 &&
3088 (dev->flags&IFF_LOOPBACK) == 0 &&
3089 (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) {
1da177e4
LT		 3090 /*
3091 * If a host as already performed a random delay
3092 * [...] as part of DAD [...] there is no need
3093 * to delay again before sending the first RS
3094 */
f3ee4010 3095 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &in6addr_linklocal_allrouters);
1da177e4
LT		 3096
3097 spin_lock_bh(&ifp->lock);
3098 ifp->probes = 1;
3099 ifp->idev->if_flags |= IF_RS_SENT;
3100 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval);
3101 spin_unlock_bh(&ifp->lock);
3102 }
3103}
3104
e21e8467
SH		 3105static void addrconf_dad_run(struct inet6_dev *idev)
3106{
c5e33bdd
YH		 3107 struct inet6_ifaddr *ifp;
3108
3109 read_lock_bh(&idev->lock);
502a2ffd 3110 list_for_each_entry(ifp, &idev->addr_list, if_list) {
21809faf 3111 spin_lock(&ifp->lock);
f2344a13
HX		 3112 if (ifp->flags & IFA_F_TENTATIVE &&
3113 ifp->state == INET6_IFADDR_STATE_DAD)
3114 addrconf_dad_kick(ifp);
21809faf 3115 spin_unlock(&ifp->lock);
c5e33bdd
YH		 3116 }
3117 read_unlock_bh(&idev->lock);
3118}
3119
1da177e4
LT		 3120#ifdef CONFIG_PROC_FS
3121struct if6_iter_state {
3c40090a 3122 struct seq_net_private p;
1da177e4 3123 int bucket;
1d578303 3124 int offset;
1da177e4
LT		 3125};
3126
1d578303 3127static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos)
1da177e4
LT		 3128{
3129 struct inet6_ifaddr *ifa = NULL;
3130 struct if6_iter_state *state = seq->private;
1218854a 3131 struct net *net = seq_file_net(seq);
1d578303 3132 int p = 0;
1da177e4 3133
1d578303
MM		 3134 /* initial bucket if pos is 0 */
3135 if (pos == 0) {
3136 state->bucket = 0;
3137 state->offset = 0;
3138 }
3139
3140 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
c2e21293 3141 struct hlist_node *n;
4f70ecca 3142 hlist_for_each_entry_rcu_bh(ifa, n, &inet6_addr_lst[state->bucket],
1d578303 3143 addr_lst) {
9f0d3c27
ED		 3144 if (!net_eq(dev_net(ifa->idev->dev), net))
3145 continue;
1d578303
MM		 3146 /* sync with offset */
3147 if (p < state->offset) {
3148 p++;
3149 continue;
3150 }
3151 state->offset++;
9f0d3c27 3152 return ifa;
1d578303
MM		 3153 }
3154
3155 /* prepare for next bucket */
3156 state->offset = 0;
3157 p = 0;
1da177e4 3158 }
c2e21293 3159 return NULL;
1da177e4
LT		 3160}
3161
c2e21293 3162static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
3163 struct inet6_ifaddr *ifa)
1da177e4
LT		 3164{
3165 struct if6_iter_state *state = seq->private;
1218854a 3166 struct net *net = seq_file_net(seq);
c2e21293 3167 struct hlist_node *n = &ifa->addr_lst;
1da177e4 3168
1d578303 3169 hlist_for_each_entry_continue_rcu_bh(ifa, n, addr_lst) {
9f0d3c27
ED		 3170 if (!net_eq(dev_net(ifa->idev->dev), net))
3171 continue;
1d578303 3172 state->offset++;
9f0d3c27 3173 return ifa;
1d578303 3174 }
3c40090a 3175
c2e21293 3176 while (++state->bucket < IN6_ADDR_HSIZE) {
1d578303 3177 state->offset = 0;
4f70ecca 3178 hlist_for_each_entry_rcu_bh(ifa, n,
c2e21293 3179 &inet6_addr_lst[state->bucket], addr_lst) {
9f0d3c27
ED		 3180 if (!net_eq(dev_net(ifa->idev->dev), net))
3181 continue;
1d578303 3182 state->offset++;
9f0d3c27 3183 return ifa;
c2e21293 3184 }
1da177e4 3185 }
3c40090a 3186
c2e21293 3187 return NULL;
1da177e4
LT		 3188}
3189
1da177e4 3190static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
4f70ecca 3191 __acquires(rcu_bh)
1da177e4 3192{
5c578aed 3193 rcu_read_lock_bh();
1d578303 3194 return if6_get_first(seq, *pos);
1da177e4
LT		 3195}
3196
3197static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3198{
3199 struct inet6_ifaddr *ifa;
3200
3201 ifa = if6_get_next(seq, v);
3202 ++*pos;
3203 return ifa;
3204}
3205
3206static void if6_seq_stop(struct seq_file *seq, void *v)
4f70ecca 3207 __releases(rcu_bh)
1da177e4 3208{
5c578aed 3209 rcu_read_unlock_bh();
1da177e4
LT		 3210}
3211
3212static int if6_seq_show(struct seq_file *seq, void *v)
3213{
3214 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
4b7a4274 3215 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
b071195d 3216 &ifp->addr,
1da177e4
LT		 3217 ifp->idev->dev->ifindex,
3218 ifp->prefix_len,
3219 ifp->scope,
3220 ifp->flags,
3221 ifp->idev->dev->name);
3222 return 0;
3223}
3224
56b3d975 3225static const struct seq_operations if6_seq_ops = {
1da177e4
LT		 3226 .start = if6_seq_start,
3227 .next = if6_seq_next,
3228 .show = if6_seq_show,
3229 .stop = if6_seq_stop,
3230};
3231
3232static int if6_seq_open(struct inode *inode, struct file *file)
3233{
3c40090a
DL		 3234 return seq_open_net(inode, file, &if6_seq_ops,
3235 sizeof(struct if6_iter_state));
1da177e4
LT		 3236}
3237
9a32144e 3238static const struct file_operations if6_fops = {
1da177e4
LT		 3239 .owner = THIS_MODULE,
3240 .open = if6_seq_open,
3241 .read = seq_read,
3242 .llseek = seq_lseek,
3c40090a 3243 .release = seq_release_net,
1da177e4
LT		 3244};
3245
2c8c1e72 3246static int __net_init if6_proc_net_init(struct net *net)
1da177e4 3247{
3c40090a 3248 if (!proc_net_fops_create(net, "if_inet6", S_IRUGO, &if6_fops))
1da177e4
LT		 3249 return -ENOMEM;
3250 return 0;
3251}
3252
2c8c1e72 3253static void __net_exit if6_proc_net_exit(struct net *net)
3c40090a
DL		 3254{
3255 proc_net_remove(net, "if_inet6");
3256}
3257
3258static struct pernet_operations if6_proc_net_ops = {
3259 .init = if6_proc_net_init,
3260 .exit = if6_proc_net_exit,
3261};
3262
3263int __init if6_proc_init(void)
3264{
3265 return register_pernet_subsys(&if6_proc_net_ops);
3266}
3267
1da177e4
LT		 3268void if6_proc_exit(void)
3269{
3c40090a 3270 unregister_pernet_subsys(&if6_proc_net_ops);
1da177e4
LT		 3271}
3272#endif /* CONFIG_PROC_FS */
3273
59fbb3a6 3274#if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
3b9f9a1c 3275/* Check if address is a home address configured on any interface. */
b71d1d42 3276int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr)
3b9f9a1c
NT		 3277{
3278 int ret = 0;
c2e21293 3279 struct inet6_ifaddr *ifp = NULL;
3280 struct hlist_node *n;
ddbe5032 3281 unsigned int hash = inet6_addr_hash(addr);
c2e21293 3282
5c578aed 3283 rcu_read_lock_bh();
4f70ecca 3284 hlist_for_each_entry_rcu_bh(ifp, n, &inet6_addr_lst[hash], addr_lst) {
878628fb 3285 if (!net_eq(dev_net(ifp->idev->dev), net))
389f6612 3286 continue;
caad295f 3287 if (ipv6_addr_equal(&ifp->addr, addr) &&
3b9f9a1c
NT		 3288 (ifp->flags & IFA_F_HOMEADDRESS)) {
3289 ret = 1;
3290 break;
3291 }
3292 }
5c578aed 3293 rcu_read_unlock_bh();
3b9f9a1c
NT		 3294 return ret;
3295}
3296#endif
3297
1da177e4
LT		 3298/*
3299 * Periodic address status verification
3300 */
3301
3302static void addrconf_verify(unsigned long foo)
3303{
b2db7564 3304 unsigned long now, next, next_sec, next_sched;
1da177e4 3305 struct inet6_ifaddr *ifp;
c2e21293 3306 struct hlist_node *node;
1da177e4
LT		 3307 int i;
3308
5c578aed 3309 rcu_read_lock_bh();
3310 spin_lock(&addrconf_verify_lock);
1da177e4 3311 now = jiffies;
b2db7564 3312 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
1da177e4
LT		 3313
3314 del_timer(&addr_chk_timer);
3315
bcdd553f 3316 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
1da177e4 3317restart:
4f70ecca 3318 hlist_for_each_entry_rcu_bh(ifp, node,
5c578aed 3319 &inet6_addr_lst[i], addr_lst) {
1da177e4 3320 unsigned long age;
1da177e4
LT		 3321
3322 if (ifp->flags & IFA_F_PERMANENT)
3323 continue;
3324
3325 spin_lock(&ifp->lock);
b2db7564
YH		 3326 /* We try to batch several events at once. */
3327 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
1da177e4 3328
8f27ebb9
YH		 3329 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
3330 age >= ifp->valid_lft) {
1da177e4
LT		 3331 spin_unlock(&ifp->lock);
3332 in6_ifa_hold(ifp);
1da177e4
LT		 3333 ipv6_del_addr(ifp);
3334 goto restart;
8f27ebb9
YH		 3335 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
3336 spin_unlock(&ifp->lock);
3337 continue;
1da177e4 3338 } else if (age >= ifp->prefered_lft) {
a1ed0526 3339 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
1da177e4
LT		 3340 int deprecate = 0;
3341
3342 if (!(ifp->flags&IFA_F_DEPRECATED)) {
3343 deprecate = 1;
3344 ifp->flags |= IFA_F_DEPRECATED;
3345 }
3346
3347 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))
3348 next = ifp->tstamp + ifp->valid_lft * HZ;
3349
3350 spin_unlock(&ifp->lock);
3351
3352 if (deprecate) {
3353 in6_ifa_hold(ifp);
1da177e4
LT		 3354
3355 ipv6_ifa_notify(0, ifp);
3356 in6_ifa_put(ifp);
3357 goto restart;
3358 }
3359#ifdef CONFIG_IPV6_PRIVACY
3360 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
3361 !(ifp->flags&IFA_F_TENTATIVE)) {
88949cf4 3362 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
3363 ifp->idev->cnf.dad_transmits *
3364 ifp->idev->nd_parms->retrans_time / HZ;
3365
1da177e4
LT		 3366 if (age >= ifp->prefered_lft - regen_advance) {
3367 struct inet6_ifaddr *ifpub = ifp->ifpub;
3368 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3369 next = ifp->tstamp + ifp->prefered_lft * HZ;
3370 if (!ifp->regen_count && ifpub) {
3371 ifp->regen_count++;
3372 in6_ifa_hold(ifp);
3373 in6_ifa_hold(ifpub);
3374 spin_unlock(&ifp->lock);
5c578aed 3375
291d809b
HY		 3376 spin_lock(&ifpub->lock);
3377 ifpub->regen_count = 0;
3378 spin_unlock(&ifpub->lock);
1da177e4
LT		 3379 ipv6_create_tempaddr(ifpub, ifp);
3380 in6_ifa_put(ifpub);
3381 in6_ifa_put(ifp);
3382 goto restart;
3383 }
3384 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
3385 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
3386 spin_unlock(&ifp->lock);
3387#endif
3388 } else {
3389 /* ifp->prefered_lft <= ifp->valid_lft */
3390 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3391 next = ifp->tstamp + ifp->prefered_lft * HZ;
3392 spin_unlock(&ifp->lock);
3393 }
3394 }
1da177e4
LT		 3395 }
3396
b2db7564
YH		 3397 next_sec = round_jiffies_up(next);
3398 next_sched = next;
3399
3400 /* If rounded timeout is accurate enough, accept it. */
3401 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
3402 next_sched = next_sec;
3403
3404 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
3405 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
3406 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
3407
3408 ADBG((KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
3409 now, next, next_sec, next_sched));
3410
3411 addr_chk_timer.expires = next_sched;
1da177e4 3412 add_timer(&addr_chk_timer);
5c578aed 3413 spin_unlock(&addrconf_verify_lock);
3414 rcu_read_unlock_bh();
1da177e4
LT		 3415}
3416
461d8837
TG		 3417static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local)
3418{
3419 struct in6_addr *pfx = NULL;
3420
3421 if (addr)
3422 pfx = nla_data(addr);
3423
3424 if (local) {
3425 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
3426 pfx = NULL;
3427 else
3428 pfx = nla_data(local);
3429 }
3430
3431 return pfx;
3432}
3433
ef7c79ed 3434static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
461d8837
TG		 3435 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
3436 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
3437 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
3438};
3439
1da177e4
LT		 3440static int
3441inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3442{
3b1e0a65 3443 struct net *net = sock_net(skb->sk);
b933f716
TG		 3444 struct ifaddrmsg *ifm;
3445 struct nlattr *tb[IFA_MAX+1];
1da177e4 3446 struct in6_addr *pfx;
b933f716 3447 int err;
1da177e4 3448
b933f716
TG		 3449 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3450 if (err < 0)
3451 return err;
3452
3453 ifm = nlmsg_data(nlh);
3454 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
1da177e4
LT		 3455 if (pfx == NULL)
3456 return -EINVAL;
3457
af284937 3458 return inet6_addr_del(net, ifm->ifa_index, pfx, ifm->ifa_prefixlen);
1da177e4
LT		 3459}
3460
55ebaef1
NT		 3461static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags,
3462 u32 prefered_lft, u32 valid_lft)
081bba5b 3463{
6f704992
YH		 3464 u32 flags;
3465 clock_t expires;
4bed72e4 3466 unsigned long timeout;
46d48046 3467
081bba5b
NT		 3468 if (!valid_lft || (prefered_lft > valid_lft))
3469 return -EINVAL;
3470
4bed72e4
YH		 3471 timeout = addrconf_timeout_fixup(valid_lft, HZ);
3472 if (addrconf_finite_timeout(timeout)) {
3473 expires = jiffies_to_clock_t(timeout * HZ);
3474 valid_lft = timeout;
6f704992 3475 flags = RTF_EXPIRES;
4bed72e4
YH		 3476 } else {
3477 expires = 0;
3478 flags = 0;
3479 ifa_flags |= IFA_F_PERMANENT;
6f704992 3480 }
081bba5b 3481
4bed72e4
YH		 3482 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
3483 if (addrconf_finite_timeout(timeout)) {
3484 if (timeout == 0)
3485 ifa_flags |= IFA_F_DEPRECATED;
3486 prefered_lft = timeout;
3487 }
081bba5b
NT		 3488
3489 spin_lock_bh(&ifp->lock);
3b9f9a1c 3490 ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags;
081bba5b
NT		 3491 ifp->tstamp = jiffies;
3492 ifp->valid_lft = valid_lft;
3493 ifp->prefered_lft = prefered_lft;
3494
3495 spin_unlock_bh(&ifp->lock);
3496 if (!(ifp->flags&IFA_F_TENTATIVE))
3497 ipv6_ifa_notify(0, ifp);
081bba5b 3498
46d48046 3499 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
6f704992 3500 expires, flags);
081bba5b
NT		 3501 addrconf_verify(0);
3502
3503 return 0;
3504}
3505
1da177e4
LT		 3506static int
3507inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3508{
3b1e0a65 3509 struct net *net = sock_net(skb->sk);
461d8837
TG		 3510 struct ifaddrmsg *ifm;
3511 struct nlattr *tb[IFA_MAX+1];
1da177e4 3512 struct in6_addr *pfx;
7198f8ce
TG		 3513 struct inet6_ifaddr *ifa;
3514 struct net_device *dev;
55ebaef1
NT		 3515 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
3516 u8 ifa_flags;
461d8837 3517 int err;
1da177e4 3518
461d8837
TG		 3519 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3520 if (err < 0)
3521 return err;
3522
3523 ifm = nlmsg_data(nlh);
3524 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
1da177e4
LT		 3525 if (pfx == NULL)
3526 return -EINVAL;
3527
461d8837 3528 if (tb[IFA_CACHEINFO]) {
0778769d 3529 struct ifa_cacheinfo *ci;
461d8837
TG		 3530
3531 ci = nla_data(tb[IFA_CACHEINFO]);
0778769d 3532 valid_lft = ci->ifa_valid;
461d8837
TG		 3533 preferred_lft = ci->ifa_prefered;
3534 } else {
3535 preferred_lft = INFINITY_LIFE_TIME;
3536 valid_lft = INFINITY_LIFE_TIME;
0778769d
NT		 3537 }
3538
af284937 3539 dev = __dev_get_by_index(net, ifm->ifa_index);
7198f8ce
TG		 3540 if (dev == NULL)
3541 return -ENODEV;
3542
55ebaef1 3543 /* We ignore other flags so far. */
3b9f9a1c 3544 ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS);
55ebaef1 3545
1cab3da6 3546 ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
7198f8ce
TG		 3547 if (ifa == NULL) {
3548 /*
3549 * It would be best to check for !NLM_F_CREATE here but
3550 * userspace alreay relies on not having to provide this.
3551 */
af284937
DL		 3552 return inet6_addr_add(net, ifm->ifa_index, pfx,
3553 ifm->ifa_prefixlen, ifa_flags,
3554 preferred_lft, valid_lft);
081bba5b
NT		 3555 }
3556
7198f8ce
TG		 3557 if (nlh->nlmsg_flags & NLM_F_EXCL ||
3558 !(nlh->nlmsg_flags & NLM_F_REPLACE))
3559 err = -EEXIST;
3560 else
55ebaef1 3561 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
7198f8ce
TG		 3562
3563 in6_ifa_put(ifa);
3564
3565 return err;
1da177e4
LT		 3566}
3567
101bb229
TG		 3568static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags,
3569 u8 scope, int ifindex)
3570{
3571 struct ifaddrmsg *ifm;
3572
3573 ifm = nlmsg_data(nlh);
3574 ifm->ifa_family = AF_INET6;
3575 ifm->ifa_prefixlen = prefixlen;
3576 ifm->ifa_flags = flags;
3577 ifm->ifa_scope = scope;
3578 ifm->ifa_index = ifindex;
3579}
3580
85486af0
TG		 3581static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
3582 unsigned long tstamp, u32 preferred, u32 valid)
3583{
3584 struct ifa_cacheinfo ci;
3585
18a31e1e
TG		 3586 ci.cstamp = cstamp_delta(cstamp);
3587 ci.tstamp = cstamp_delta(tstamp);
85486af0
TG		 3588 ci.ifa_prefered = preferred;
3589 ci.ifa_valid = valid;
3590
3591 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
3592}
3593
101bb229
TG		 3594static inline int rt_scope(int ifa_scope)
3595{
3596 if (ifa_scope & IFA_HOST)
3597 return RT_SCOPE_HOST;
3598 else if (ifa_scope & IFA_LINK)
3599 return RT_SCOPE_LINK;
3600 else if (ifa_scope & IFA_SITE)
3601 return RT_SCOPE_SITE;
3602 else
3603 return RT_SCOPE_UNIVERSE;
3604}
3605
0ab6803b
TG		 3606static inline int inet6_ifaddr_msgsize(void)
3607{
339bf98f
TG		 3608 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
3609 + nla_total_size(16) /* IFA_ADDRESS */
3610 + nla_total_size(sizeof(struct ifa_cacheinfo));
0ab6803b 3611}
c5396a31 3612
1da177e4 3613static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
15e47304 3614 u32 portid, u32 seq, int event, unsigned int flags)
1da177e4 3615{
1da177e4 3616 struct nlmsghdr *nlh;
85486af0 3617 u32 preferred, valid;
1da177e4 3618
15e47304 3619 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
0ab6803b 3620 if (nlh == NULL)
26932566 3621 return -EMSGSIZE;
0ab6803b 3622
101bb229
TG		 3623 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
3624 ifa->idev->dev->ifindex);
3625
1da177e4 3626 if (!(ifa->flags&IFA_F_PERMANENT)) {
85486af0
TG		 3627 preferred = ifa->prefered_lft;
3628 valid = ifa->valid_lft;
3629 if (preferred != INFINITY_LIFE_TIME) {
1da177e4 3630 long tval = (jiffies - ifa->tstamp)/HZ;
a1faa698
JR		 3631 if (preferred > tval)
3632 preferred -= tval;
3633 else
3634 preferred = 0;
f56619fc
BH		 3635 if (valid != INFINITY_LIFE_TIME) {
3636 if (valid > tval)
3637 valid -= tval;
3638 else
3639 valid = 0;
3640 }
1da177e4
LT		 3641 }
3642 } else {
85486af0
TG		 3643 preferred = INFINITY_LIFE_TIME;
3644 valid = INFINITY_LIFE_TIME;
3645 }
3646
0ab6803b 3647 if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0 ||
26932566
PM		 3648 put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) {
3649 nlmsg_cancel(skb, nlh);
3650 return -EMSGSIZE;
3651 }
1da177e4 3652
0ab6803b 3653 return nlmsg_end(skb, nlh);
1da177e4
LT		 3654}
3655
3656static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
15e47304 3657 u32 portid, u32 seq, int event, u16 flags)
1da177e4 3658{
1da177e4 3659 struct nlmsghdr *nlh;
101bb229
TG		 3660 u8 scope = RT_SCOPE_UNIVERSE;
3661 int ifindex = ifmca->idev->dev->ifindex;
3662
3663 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
3664 scope = RT_SCOPE_SITE;
1da177e4 3665
15e47304 3666 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
0ab6803b 3667 if (nlh == NULL)
26932566 3668 return -EMSGSIZE;
85486af0 3669
0ab6803b
TG		 3670 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3671 if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 ||
3672 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
26932566
PM		 3673 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3674 nlmsg_cancel(skb, nlh);
3675 return -EMSGSIZE;
3676 }
85486af0 3677
0ab6803b 3678 return nlmsg_end(skb, nlh);
1da177e4
LT		 3679}
3680
3681static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
15e47304 3682 u32 portid, u32 seq, int event, unsigned int flags)
1da177e4 3683{
1da177e4 3684 struct nlmsghdr *nlh;
101bb229
TG		 3685 u8 scope = RT_SCOPE_UNIVERSE;
3686 int ifindex = ifaca->aca_idev->dev->ifindex;
3687
3688 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
3689 scope = RT_SCOPE_SITE;
1da177e4 3690
15e47304 3691 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
0ab6803b 3692 if (nlh == NULL)
26932566 3693 return -EMSGSIZE;
85486af0 3694
0ab6803b
TG		 3695 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3696 if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 ||
3697 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
26932566
PM		 3698 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3699 nlmsg_cancel(skb, nlh);
3700 return -EMSGSIZE;
3701 }
1da177e4 3702
0ab6803b 3703 return nlmsg_end(skb, nlh);
1da177e4
LT		 3704}
3705
e21e8467 3706enum addr_type_t {
1da177e4
LT		 3707 UNICAST_ADDR,
3708 MULTICAST_ADDR,
3709 ANYCAST_ADDR,
3710};
3711
234b27c3
ED		 3712/* called with rcu_read_lock() */
3713static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
3714 struct netlink_callback *cb, enum addr_type_t type,
3715 int s_ip_idx, int *p_ip_idx)
3716{
234b27c3
ED		 3717 struct ifmcaddr6 *ifmca;
3718 struct ifacaddr6 *ifaca;
3719 int err = 1;
3720 int ip_idx = *p_ip_idx;
3721
3722 read_lock_bh(&idev->lock);
3723 switch (type) {
502a2ffd 3724 case UNICAST_ADDR: {
3725 struct inet6_ifaddr *ifa;
3726
234b27c3 3727 /* unicast address incl. temp addr */
502a2ffd 3728 list_for_each_entry(ifa, &idev->addr_list, if_list) {
3729 if (++ip_idx < s_ip_idx)
234b27c3
ED		 3730 continue;
3731 err = inet6_fill_ifaddr(skb, ifa,
15e47304 3732 NETLINK_CB(cb->skb).portid,
234b27c3
ED		 3733 cb->nlh->nlmsg_seq,
3734 RTM_NEWADDR,
3735 NLM_F_MULTI);
3736 if (err <= 0)
3737 break;
3738 }
3739 break;
502a2ffd 3740 }
234b27c3
ED		 3741 case MULTICAST_ADDR:
3742 /* multicast address */
3743 for (ifmca = idev->mc_list; ifmca;
3744 ifmca = ifmca->next, ip_idx++) {
3745 if (ip_idx < s_ip_idx)
3746 continue;
3747 err = inet6_fill_ifmcaddr(skb, ifmca,
15e47304 3748 NETLINK_CB(cb->skb).portid,
234b27c3
ED		 3749 cb->nlh->nlmsg_seq,
3750 RTM_GETMULTICAST,
3751 NLM_F_MULTI);
3752 if (err <= 0)
3753 break;
3754 }
3755 break;
3756 case ANYCAST_ADDR:
3757 /* anycast address */
3758 for (ifaca = idev->ac_list; ifaca;
3759 ifaca = ifaca->aca_next, ip_idx++) {
3760 if (ip_idx < s_ip_idx)
3761 continue;
3762 err = inet6_fill_ifacaddr(skb, ifaca,
15e47304 3763 NETLINK_CB(cb->skb).portid,
234b27c3
ED		 3764 cb->nlh->nlmsg_seq,
3765 RTM_GETANYCAST,
3766 NLM_F_MULTI);
3767 if (err <= 0)
3768 break;
3769 }
3770 break;
3771 default:
3772 break;
3773 }
3774 read_unlock_bh(&idev->lock);
3775 *p_ip_idx = ip_idx;
3776 return err;
3777}
3778
1da177e4
LT		 3779static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
3780 enum addr_type_t type)
3781{
234b27c3
ED		 3782 struct net *net = sock_net(skb->sk);
3783 int h, s_h;
1da177e4
LT		 3784 int idx, ip_idx;
3785 int s_idx, s_ip_idx;
1da177e4 3786 struct net_device *dev;
234b27c3
ED		 3787 struct inet6_dev *idev;
3788 struct hlist_head *head;
3789 struct hlist_node *node;
1ab1457c 3790
234b27c3
ED		 3791 s_h = cb->args[0];
3792 s_idx = idx = cb->args[1];
3793 s_ip_idx = ip_idx = cb->args[2];
5d5619b4 3794
234b27c3
ED		 3795 rcu_read_lock();
3796 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
3797 idx = 0;
3798 head = &net->dev_index_head[h];
3799 hlist_for_each_entry_rcu(dev, node, head, index_hlist) {
3800 if (idx < s_idx)
3801 goto cont;
4b97efdf 3802 if (h > s_h || idx > s_idx)
234b27c3
ED		 3803 s_ip_idx = 0;
3804 ip_idx = 0;
e21e8467
SH		 3805 idev = __in6_dev_get(dev);
3806 if (!idev)
234b27c3
ED		 3807 goto cont;
3808
3809 if (in6_dump_addrs(idev, skb, cb, type,
3810 s_ip_idx, &ip_idx) <= 0)
3811 goto done;
7562f876 3812cont:
234b27c3
ED		 3813 idx++;
3814 }
1da177e4 3815 }
234b27c3
ED		 3816done:
3817 rcu_read_unlock();
3818 cb->args[0] = h;
3819 cb->args[1] = idx;
3820 cb->args[2] = ip_idx;
3821
1da177e4
LT		 3822 return skb->len;
3823}
3824
3825static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
3826{
3827 enum addr_type_t type = UNICAST_ADDR;
b854272b 3828
1da177e4
LT		 3829 return inet6_dump_addr(skb, cb, type);
3830}
3831
3832static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
3833{
3834 enum addr_type_t type = MULTICAST_ADDR;
b854272b 3835
1da177e4
LT		 3836 return inet6_dump_addr(skb, cb, type);
3837}
3838
3839
3840static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
3841{
3842 enum addr_type_t type = ANYCAST_ADDR;
b854272b 3843
1da177e4
LT		 3844 return inet6_dump_addr(skb, cb, type);
3845}
3846
8e5e8f30 3847static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh,
1b29fc2c 3848 void *arg)
6c223828 3849{
3b1e0a65 3850 struct net *net = sock_net(in_skb->sk);
1b29fc2c
TG		 3851 struct ifaddrmsg *ifm;
3852 struct nlattr *tb[IFA_MAX+1];
6c223828
NT		 3853 struct in6_addr *addr = NULL;
3854 struct net_device *dev = NULL;
3855 struct inet6_ifaddr *ifa;
3856 struct sk_buff *skb;
6c223828
NT		 3857 int err;
3858
1b29fc2c
TG		 3859 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3860 if (err < 0)
3861 goto errout;
3862
3863 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3864 if (addr == NULL) {
3865 err = -EINVAL;
3866 goto errout;
6c223828 3867 }
6c223828 3868
1b29fc2c 3869 ifm = nlmsg_data(nlh);
6c223828 3870 if (ifm->ifa_index)
6fda7350 3871 dev = __dev_get_by_index(net, ifm->ifa_index);
6c223828 3872
e21e8467
SH		 3873 ifa = ipv6_get_ifaddr(net, addr, dev, 1);
3874 if (!ifa) {
1b29fc2c
TG		 3875 err = -EADDRNOTAVAIL;
3876 goto errout;
3877 }
6c223828 3878
e21e8467
SH		 3879 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
3880 if (!skb) {
6c223828 3881 err = -ENOBUFS;
1b29fc2c 3882 goto errout_ifa;
6c223828
NT		 3883 }
3884
15e47304 3885 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).portid,
6c223828 3886 nlh->nlmsg_seq, RTM_NEWADDR, 0);
26932566
PM		 3887 if (err < 0) {
3888 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3889 WARN_ON(err == -EMSGSIZE);
3890 kfree_skb(skb);
3891 goto errout_ifa;
3892 }
15e47304 3893 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
1b29fc2c 3894errout_ifa:
6c223828 3895 in6_ifa_put(ifa);
1b29fc2c 3896errout:
6c223828 3897 return err;
6c223828
NT		 3898}
3899
1da177e4
LT		 3900static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
3901{
3902 struct sk_buff *skb;
c346dca1 3903 struct net *net = dev_net(ifa->idev->dev);
5d620266 3904 int err = -ENOBUFS;
1da177e4 3905
0ab6803b 3906 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
5d620266
TG		 3907 if (skb == NULL)
3908 goto errout;
3909
3910 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
26932566
PM		 3911 if (err < 0) {
3912 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3913 WARN_ON(err == -EMSGSIZE);
3914 kfree_skb(skb);
3915 goto errout;
3916 }
1ce85fe4
PNA		 3917 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
3918 return;
5d620266
TG		 3919errout:
3920 if (err < 0)
6fda7350 3921 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
1da177e4
LT		 3922}
3923
b6f99a21 3924static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
1da177e4
LT		 3925 __s32 *array, int bytes)
3926{
04561c1f
TG		 3927 BUG_ON(bytes < (DEVCONF_MAX * 4));
3928
1da177e4
LT		 3929 memset(array, 0, bytes);
3930 array[DEVCONF_FORWARDING] = cnf->forwarding;
3931 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
3932 array[DEVCONF_MTU6] = cnf->mtu6;
3933 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
3934 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
3935 array[DEVCONF_AUTOCONF] = cnf->autoconf;
3936 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
3937 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
93908d19
TG		 3938 array[DEVCONF_RTR_SOLICIT_INTERVAL] =
3939 jiffies_to_msecs(cnf->rtr_solicit_interval);
3940 array[DEVCONF_RTR_SOLICIT_DELAY] =
3941 jiffies_to_msecs(cnf->rtr_solicit_delay);
1da177e4
LT		 3942 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
3943#ifdef CONFIG_IPV6_PRIVACY
3944 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
3945 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
3946 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
3947 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
3948 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
3949#endif
3950 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
65f5c7c1 3951 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
c4fd30eb 3952 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
930d6ff2
YH		 3953#ifdef CONFIG_IPV6_ROUTER_PREF
3954 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
93908d19
TG		 3955 array[DEVCONF_RTR_PROBE_INTERVAL] =
3956 jiffies_to_msecs(cnf->rtr_probe_interval);
fa03ef38 3957#ifdef CONFIG_IPV6_ROUTE_INFO
09c884d4
YH		 3958 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
3959#endif
930d6ff2 3960#endif
fbea49e1 3961 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
0bcbc926 3962 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
95c385b4
NH		 3963#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
3964 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
3965#endif
7bc570c8
YH		 3966#ifdef CONFIG_IPV6_MROUTE
3967 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
3968#endif
778d80be 3969 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
1b34be74 3970 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
c3faca05 3971 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
1da177e4
LT		 3972}
3973
b382b191
TG		 3974static inline size_t inet6_ifla6_size(void)
3975{
3976 return nla_total_size(4) /* IFLA_INET6_FLAGS */
3977 + nla_total_size(sizeof(struct ifla_cacheinfo))
3978 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
3979 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
3980 + nla_total_size(ICMP6_MIB_MAX * 8); /* IFLA_INET6_ICMP6STATS */
3981}
3982
339bf98f
TG		 3983static inline size_t inet6_if_nlmsg_size(void)
3984{
3985 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
3986 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
3987 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
3988 + nla_total_size(4) /* IFLA_MTU */
3989 + nla_total_size(4) /* IFLA_LINK */
b382b191 3990 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */
339bf98f 3991}
c5396a31 3992
be281e55 3993static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib,
7d720c3e 3994 int items, int bytes)
7f7d9a6b
HX		 3995{
3996 int i;
3997 int pad = bytes - sizeof(u64) * items;
3998 BUG_ON(pad < 0);
3999
4000 /* Use put_unaligned() because stats may not be aligned for u64. */
4001 put_unaligned(items, &stats[0]);
4002 for (i = 1; i < items; i++)
be281e55 4003 put_unaligned(atomic_long_read(&mib[i]), &stats[i]);
7f7d9a6b
HX		 4004
4005 memset(&stats[items], 0, pad);
4006}
4007
4ce3c183
ED		 4008static inline void __snmp6_fill_stats64(u64 *stats, void __percpu **mib,
4009 int items, int bytes, size_t syncpoff)
4010{
4011 int i;
4012 int pad = bytes - sizeof(u64) * items;
4013 BUG_ON(pad < 0);
4014
4015 /* Use put_unaligned() because stats may not be aligned for u64. */
4016 put_unaligned(items, &stats[0]);
4017 for (i = 1; i < items; i++)
4018 put_unaligned(snmp_fold_field64(mib, i, syncpoff), &stats[i]);
4019
4020 memset(&stats[items], 0, pad);
4021}
4022
7f7d9a6b
HX		 4023static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
4024 int bytes)
4025{
e21e8467 4026 switch (attrtype) {
7f7d9a6b 4027 case IFLA_INET6_STATS:
4ce3c183
ED		 4028 __snmp6_fill_stats64(stats, (void __percpu **)idev->stats.ipv6,
4029 IPSTATS_MIB_MAX, bytes, offsetof(struct ipstats_mib, syncp));
7f7d9a6b
HX		 4030 break;
4031 case IFLA_INET6_ICMP6STATS:
be281e55 4032 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, ICMP6_MIB_MAX, bytes);
7f7d9a6b
HX		 4033 break;
4034 }
4035}
4036
b382b191
TG		 4037static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev)
4038{
4039 struct nlattr *nla;
4040 struct ifla_cacheinfo ci;
4041
c78679e8
DM		 4042 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags))
4043 goto nla_put_failure;
b382b191 4044 ci.max_reasm_len = IPV6_MAXPLEN;
24912420
DM		 4045 ci.tstamp = cstamp_delta(idev->tstamp);
4046 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time);
4047 ci.retrans_time = jiffies_to_msecs(idev->nd_parms->retrans_time);
c78679e8
DM		 4048 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci))
4049 goto nla_put_failure;
b382b191
TG		 4050 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
4051 if (nla == NULL)
4052 goto nla_put_failure;
4053 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
4054
4055 /* XXX - MC not implemented */
4056
4057 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
4058 if (nla == NULL)
4059 goto nla_put_failure;
4060 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
4061
4062 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
4063 if (nla == NULL)
4064 goto nla_put_failure;
4065 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
4066
4067 return 0;
4068
4069nla_put_failure:
4070 return -EMSGSIZE;
4071}
4072
4073static size_t inet6_get_link_af_size(const struct net_device *dev)
4074{
4075 if (!__in6_dev_get(dev))
4076 return 0;
4077
4078 return inet6_ifla6_size();
4079}
4080
4081static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev)
4082{
4083 struct inet6_dev *idev = __in6_dev_get(dev);
4084
4085 if (!idev)
4086 return -ENODATA;
4087
4088 if (inet6_fill_ifla6_attrs(skb, idev) < 0)
4089 return -EMSGSIZE;
4090
4091 return 0;
4092}
4093
1ab1457c 4094static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
15e47304 4095 u32 portid, u32 seq, int event, unsigned int flags)
1da177e4 4096{
04561c1f 4097 struct net_device *dev = idev->dev;
04561c1f
TG		 4098 struct ifinfomsg *hdr;
4099 struct nlmsghdr *nlh;
4100 void *protoinfo;
04561c1f 4101
15e47304 4102 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags);
04561c1f 4103 if (nlh == NULL)
26932566 4104 return -EMSGSIZE;
04561c1f
TG		 4105
4106 hdr = nlmsg_data(nlh);
4107 hdr->ifi_family = AF_INET6;
4108 hdr->__ifi_pad = 0;
4109 hdr->ifi_type = dev->type;
4110 hdr->ifi_index = dev->ifindex;
4111 hdr->ifi_flags = dev_get_flags(dev);
4112 hdr->ifi_change = 0;
4113
c78679e8
DM		 4114 if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
4115 (dev->addr_len &&
4116 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
4117 nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
4118 (dev->ifindex != dev->iflink &&
4119 nla_put_u32(skb, IFLA_LINK, dev->iflink)))
4120 goto nla_put_failure;
04561c1f
TG		 4121 protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
4122 if (protoinfo == NULL)
4123 goto nla_put_failure;
1da177e4 4124
b382b191 4125 if (inet6_fill_ifla6_attrs(skb, idev) < 0)
bf99f1bd 4126 goto nla_put_failure;
1da177e4 4127
04561c1f
TG		 4128 nla_nest_end(skb, protoinfo);
4129 return nlmsg_end(skb, nlh);
1da177e4 4130
04561c1f 4131nla_put_failure:
26932566
PM		 4132 nlmsg_cancel(skb, nlh);
4133 return -EMSGSIZE;
1da177e4
LT		 4134}
4135
4136static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
4137{
3b1e0a65 4138 struct net *net = sock_net(skb->sk);
84d2697d 4139 int h, s_h;
434a8a58 4140 int idx = 0, s_idx;
1da177e4
LT		 4141 struct net_device *dev;
4142 struct inet6_dev *idev;
84d2697d
ED		 4143 struct hlist_head *head;
4144 struct hlist_node *node;
1da177e4 4145
84d2697d
ED		 4146 s_h = cb->args[0];
4147 s_idx = cb->args[1];
4148
4149 rcu_read_lock();
4150 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4151 idx = 0;
4152 head = &net->dev_index_head[h];
4153 hlist_for_each_entry_rcu(dev, node, head, index_hlist) {
4154 if (idx < s_idx)
4155 goto cont;
4156 idev = __in6_dev_get(dev);
4157 if (!idev)
4158 goto cont;
4159 if (inet6_fill_ifinfo(skb, idev,
15e47304 4160 NETLINK_CB(cb->skb).portid,
84d2697d
ED		 4161 cb->nlh->nlmsg_seq,
4162 RTM_NEWLINK, NLM_F_MULTI) <= 0)
4163 goto out;
7562f876 4164cont:
84d2697d
ED		 4165 idx++;
4166 }
1da177e4 4167 }
84d2697d
ED		 4168out:
4169 rcu_read_unlock();
4170 cb->args[1] = idx;
4171 cb->args[0] = h;
1da177e4
LT		 4172
4173 return skb->len;
4174}
4175
4176void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
4177{
4178 struct sk_buff *skb;
c346dca1 4179 struct net *net = dev_net(idev->dev);
8d7a76c9 4180 int err = -ENOBUFS;
1ab1457c 4181
339bf98f 4182 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
8d7a76c9
TG		 4183 if (skb == NULL)
4184 goto errout;
4185
4186 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
26932566
PM		 4187 if (err < 0) {
4188 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
4189 WARN_ON(err == -EMSGSIZE);
4190 kfree_skb(skb);
4191 goto errout;
4192 }
5f75a104 4193 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC);
1ce85fe4 4194 return;
8d7a76c9
TG		 4195errout:
4196 if (err < 0)
5f75a104 4197 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err);
1da177e4
LT		 4198}
4199
339bf98f
TG		 4200static inline size_t inet6_prefix_nlmsg_size(void)
4201{
4202 return NLMSG_ALIGN(sizeof(struct prefixmsg))
4203 + nla_total_size(sizeof(struct in6_addr))
4204 + nla_total_size(sizeof(struct prefix_cacheinfo));
4205}
c5396a31 4206
1da177e4 4207static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
15e47304 4208 struct prefix_info *pinfo, u32 portid, u32 seq,
6051e2f4 4209 int event, unsigned int flags)
1da177e4 4210{
6051e2f4
TG		 4211 struct prefixmsg *pmsg;
4212 struct nlmsghdr *nlh;
1da177e4
LT		 4213 struct prefix_cacheinfo ci;
4214
15e47304 4215 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags);
6051e2f4 4216 if (nlh == NULL)
26932566 4217 return -EMSGSIZE;
6051e2f4
TG		 4218
4219 pmsg = nlmsg_data(nlh);
1da177e4 4220 pmsg->prefix_family = AF_INET6;
8a47077a
PM		 4221 pmsg->prefix_pad1 = 0;
4222 pmsg->prefix_pad2 = 0;
1da177e4
LT		 4223 pmsg->prefix_ifindex = idev->dev->ifindex;
4224 pmsg->prefix_len = pinfo->prefix_len;
4225 pmsg->prefix_type = pinfo->type;
8a47077a 4226 pmsg->prefix_pad3 = 0;
1da177e4
LT		 4227 pmsg->prefix_flags = 0;
4228 if (pinfo->onlink)
4229 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
4230 if (pinfo->autoconf)
4231 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
4232
c78679e8
DM		 4233 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix))
4234 goto nla_put_failure;
1da177e4
LT		 4235 ci.preferred_time = ntohl(pinfo->prefered);
4236 ci.valid_time = ntohl(pinfo->valid);
c78679e8
DM		 4237 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci))
4238 goto nla_put_failure;
6051e2f4 4239 return nlmsg_end(skb, nlh);
1da177e4 4240
6051e2f4 4241nla_put_failure:
26932566
PM		 4242 nlmsg_cancel(skb, nlh);
4243 return -EMSGSIZE;
1da177e4
LT		 4244}
4245
1ab1457c 4246static void inet6_prefix_notify(int event, struct inet6_dev *idev,
1da177e4
LT		 4247 struct prefix_info *pinfo)
4248{
4249 struct sk_buff *skb;
c346dca1 4250 struct net *net = dev_net(idev->dev);
8c384bfa 4251 int err = -ENOBUFS;
1da177e4 4252
339bf98f 4253 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
8c384bfa
TG		 4254 if (skb == NULL)
4255 goto errout;
4256
4257 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
26932566
PM		 4258 if (err < 0) {
4259 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
4260 WARN_ON(err == -EMSGSIZE);
4261 kfree_skb(skb);
4262 goto errout;
4263 }
1ce85fe4
PNA		 4264 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
4265 return;
8c384bfa
TG		 4266errout:
4267 if (err < 0)
6fda7350 4268 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
1da177e4
LT		 4269}
4270
1da177e4
LT		 4271static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4272{
4273 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
4274
4275 switch (event) {
4276 case RTM_NEWADDR:
95c385b4
NH		 4277 /*
4278 * If the address was optimistic
4279 * we inserted the route at the start of
4280 * our DAD process, so we don't need
4281 * to do it again
4282 */
4283 if (!(ifp->rt->rt6i_node))
4284 ip6_ins_rt(ifp->rt);
1da177e4
LT		 4285 if (ifp->idev->cnf.forwarding)
4286 addrconf_join_anycast(ifp);
4287 break;
4288 case RTM_DELADDR:
4289 if (ifp->idev->cnf.forwarding)
4290 addrconf_leave_anycast(ifp);
4291 addrconf_leave_solict(ifp->idev, &ifp->addr);
d8d1f30b 4292 dst_hold(&ifp->rt->dst);
93fa159a 4293
73a8bd74 4294 if (ip6_del_rt(ifp->rt))
d8d1f30b 4295 dst_free(&ifp->rt->dst);
1da177e4
LT		 4296 break;
4297 }
4298}
4299
4300static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4301{
8814c4b5 4302 rcu_read_lock_bh();
1da177e4
LT		 4303 if (likely(ifp->idev->dead == 0))
4304 __ipv6_ifa_notify(event, ifp);
8814c4b5 4305 rcu_read_unlock_bh();
1da177e4
LT		 4306}
4307
4308#ifdef CONFIG_SYSCTL
4309
4310static
8d65af78 4311int addrconf_sysctl_forward(ctl_table *ctl, int write,
1da177e4
LT		 4312 void __user *buffer, size_t *lenp, loff_t *ppos)
4313{
4314 int *valp = ctl->data;
4315 int val = *valp;
88af182e 4316 loff_t pos = *ppos;
013d97e9 4317 ctl_table lctl;
1da177e4
LT		 4318 int ret;
4319
013d97e9
FR		 4320 /*
4321 * ctl->data points to idev->cnf.forwarding, we should
4322 * not modify it until we get the rtnl lock.
4323 */
4324 lctl = *ctl;
4325 lctl.data = &val;
4326
4327 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
1da177e4 4328
c8fecf22 4329 if (write)
b325fddb 4330 ret = addrconf_fixup_forwarding(ctl, valp, val);
88af182e
EB		 4331 if (ret)
4332 *ppos = pos;
1ab1457c 4333 return ret;
1da177e4
LT		 4334}
4335
56d417b1
BH		 4336static void dev_disable_change(struct inet6_dev *idev)
4337{
4338 if (!idev || !idev->dev)
4339 return;
4340
4341 if (idev->cnf.disable_ipv6)
4342 addrconf_notify(NULL, NETDEV_DOWN, idev->dev);
4343 else
4344 addrconf_notify(NULL, NETDEV_UP, idev->dev);
4345}
4346
4347static void addrconf_disable_change(struct net *net, __s32 newf)
4348{
4349 struct net_device *dev;
4350 struct inet6_dev *idev;
4351
c6d14c84
ED		 4352 rcu_read_lock();
4353 for_each_netdev_rcu(net, dev) {
56d417b1
BH		 4354 idev = __in6_dev_get(dev);
4355 if (idev) {
4356 int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
4357 idev->cnf.disable_ipv6 = newf;
4358 if (changed)
4359 dev_disable_change(idev);
4360 }
56d417b1 4361 }
c6d14c84 4362 rcu_read_unlock();
56d417b1
BH		 4363}
4364
013d97e9 4365static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf)
56d417b1
BH		 4366{
4367 struct net *net;
013d97e9
FR		 4368 int old;
4369
4370 if (!rtnl_trylock())
4371 return restart_syscall();
56d417b1
BH		 4372
4373 net = (struct net *)table->extra2;
013d97e9
FR		 4374 old = *p;
4375 *p = newf;
56d417b1 4376
013d97e9
FR		 4377 if (p == &net->ipv6.devconf_dflt->disable_ipv6) {
4378 rtnl_unlock();
56d417b1 4379 return 0;
88af182e 4380 }
56d417b1
BH		 4381
4382 if (p == &net->ipv6.devconf_all->disable_ipv6) {
56d417b1
BH		 4383 net->ipv6.devconf_dflt->disable_ipv6 = newf;
4384 addrconf_disable_change(net, newf);
013d97e9 4385 } else if ((!newf) ^ (!old))
56d417b1
BH		 4386 dev_disable_change((struct inet6_dev *)table->extra1);
4387
4388 rtnl_unlock();
4389 return 0;
4390}
4391
4392static
8d65af78 4393int addrconf_sysctl_disable(ctl_table *ctl, int write,
56d417b1
BH		 4394 void __user *buffer, size_t *lenp, loff_t *ppos)
4395{
4396 int *valp = ctl->data;
4397 int val = *valp;
88af182e 4398 loff_t pos = *ppos;
013d97e9 4399 ctl_table lctl;
56d417b1
BH		 4400 int ret;
4401
013d97e9
FR		 4402 /*
4403 * ctl->data points to idev->cnf.disable_ipv6, we should
4404 * not modify it until we get the rtnl lock.
4405 */
4406 lctl = *ctl;
4407 lctl.data = &val;
4408
4409 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
56d417b1
BH		 4410
4411 if (write)
4412 ret = addrconf_disable_ipv6(ctl, valp, val);
88af182e
EB		 4413 if (ret)
4414 *ppos = pos;
56d417b1
BH		 4415 return ret;
4416}
4417
1da177e4
LT		 4418static struct addrconf_sysctl_table
4419{
4420 struct ctl_table_header *sysctl_header;
f6a07b29 4421 ctl_table addrconf_vars[DEVCONF_MAX+1];
ab32ea5d 4422} addrconf_sysctl __read_mostly = {
1da177e4
LT		 4423 .sysctl_header = NULL,
4424 .addrconf_vars = {
1ab1457c 4425 {
e21e8467
SH		 4426 .procname = "forwarding",
4427 .data = &ipv6_devconf.forwarding,
4428 .maxlen = sizeof(int),
4429 .mode = 0644,
4430 .proc_handler = addrconf_sysctl_forward,
1da177e4
LT		 4431 },
4432 {
e21e8467
SH		 4433 .procname = "hop_limit",
4434 .data = &ipv6_devconf.hop_limit,
4435 .maxlen = sizeof(int),
4436 .mode = 0644,
4437 .proc_handler = proc_dointvec,
1da177e4
LT		 4438 },
4439 {
e21e8467
SH		 4440 .procname = "mtu",
4441 .data = &ipv6_devconf.mtu6,
4442 .maxlen = sizeof(int),
4443 .mode = 0644,
4444 .proc_handler = proc_dointvec,
1da177e4
LT		 4445 },
4446 {
e21e8467
SH		 4447 .procname = "accept_ra",
4448 .data = &ipv6_devconf.accept_ra,
4449 .maxlen = sizeof(int),
4450 .mode = 0644,
4451 .proc_handler = proc_dointvec,
1da177e4
LT		 4452 },
4453 {
e21e8467
SH		 4454 .procname = "accept_redirects",
4455 .data = &ipv6_devconf.accept_redirects,
4456 .maxlen = sizeof(int),
4457 .mode = 0644,
4458 .proc_handler = proc_dointvec,
1da177e4
LT		 4459 },
4460 {
e21e8467
SH		 4461 .procname = "autoconf",
4462 .data = &ipv6_devconf.autoconf,
4463 .maxlen = sizeof(int),
4464 .mode = 0644,
4465 .proc_handler = proc_dointvec,
1da177e4
LT		 4466 },
4467 {
e21e8467
SH		 4468 .procname = "dad_transmits",
4469 .data = &ipv6_devconf.dad_transmits,
4470 .maxlen = sizeof(int),
4471 .mode = 0644,
4472 .proc_handler = proc_dointvec,
1da177e4
LT		 4473 },
4474 {
e21e8467
SH		 4475 .procname = "router_solicitations",
4476 .data = &ipv6_devconf.rtr_solicits,
4477 .maxlen = sizeof(int),
4478 .mode = 0644,
4479 .proc_handler = proc_dointvec,
1da177e4
LT		 4480 },
4481 {
e21e8467
SH		 4482 .procname = "router_solicitation_interval",
4483 .data = &ipv6_devconf.rtr_solicit_interval,
4484 .maxlen = sizeof(int),
4485 .mode = 0644,
4486 .proc_handler = proc_dointvec_jiffies,
1da177e4
LT		 4487 },
4488 {
e21e8467
SH		 4489 .procname = "router_solicitation_delay",
4490 .data = &ipv6_devconf.rtr_solicit_delay,
4491 .maxlen = sizeof(int),
4492 .mode = 0644,
4493 .proc_handler = proc_dointvec_jiffies,
1da177e4
LT		 4494 },
4495 {
e21e8467
SH		 4496 .procname = "force_mld_version",
4497 .data = &ipv6_devconf.force_mld_version,
4498 .maxlen = sizeof(int),
4499 .mode = 0644,
4500 .proc_handler = proc_dointvec,
1da177e4
LT		 4501 },
4502#ifdef CONFIG_IPV6_PRIVACY
4503 {
e21e8467
SH		 4504 .procname = "use_tempaddr",
4505 .data = &ipv6_devconf.use_tempaddr,
4506 .maxlen = sizeof(int),
4507 .mode = 0644,
4508 .proc_handler = proc_dointvec,
1da177e4
LT		 4509 },
4510 {
e21e8467
SH		 4511 .procname = "temp_valid_lft",
4512 .data = &ipv6_devconf.temp_valid_lft,
4513 .maxlen = sizeof(int),
4514 .mode = 0644,
4515 .proc_handler = proc_dointvec,
1da177e4
LT		 4516 },
4517 {
e21e8467
SH		 4518 .procname = "temp_prefered_lft",
4519 .data = &ipv6_devconf.temp_prefered_lft,
4520 .maxlen = sizeof(int),
4521 .mode = 0644,
4522 .proc_handler = proc_dointvec,
1da177e4
LT		 4523 },
4524 {
e21e8467
SH		 4525 .procname = "regen_max_retry",
4526 .data = &ipv6_devconf.regen_max_retry,
4527 .maxlen = sizeof(int),
4528 .mode = 0644,
4529 .proc_handler = proc_dointvec,
1da177e4
LT		 4530 },
4531 {
e21e8467
SH		 4532 .procname = "max_desync_factor",
4533 .data = &ipv6_devconf.max_desync_factor,
4534 .maxlen = sizeof(int),
4535 .mode = 0644,
4536 .proc_handler = proc_dointvec,
1da177e4
LT		 4537 },
4538#endif
4539 {
e21e8467
SH		 4540 .procname = "max_addresses",
4541 .data = &ipv6_devconf.max_addresses,
4542 .maxlen = sizeof(int),
4543 .mode = 0644,
4544 .proc_handler = proc_dointvec,
1da177e4 4545 },
65f5c7c1 4546 {
e21e8467
SH		 4547 .procname = "accept_ra_defrtr",
4548 .data = &ipv6_devconf.accept_ra_defrtr,
4549 .maxlen = sizeof(int),
4550 .mode = 0644,
4551 .proc_handler = proc_dointvec,
65f5c7c1 4552 },
c4fd30eb 4553 {
e21e8467
SH		 4554 .procname = "accept_ra_pinfo",
4555 .data = &ipv6_devconf.accept_ra_pinfo,
4556 .maxlen = sizeof(int),
4557 .mode = 0644,
4558 .proc_handler = proc_dointvec,
c4fd30eb 4559 },
930d6ff2
YH		 4560#ifdef CONFIG_IPV6_ROUTER_PREF
4561 {
e21e8467
SH		 4562 .procname = "accept_ra_rtr_pref",
4563 .data = &ipv6_devconf.accept_ra_rtr_pref,
4564 .maxlen = sizeof(int),
4565 .mode = 0644,
4566 .proc_handler = proc_dointvec,
930d6ff2 4567 },
52e16356 4568 {
e21e8467
SH		 4569 .procname = "router_probe_interval",
4570 .data = &ipv6_devconf.rtr_probe_interval,
4571 .maxlen = sizeof(int),
4572 .mode = 0644,
4573 .proc_handler = proc_dointvec_jiffies,
52e16356 4574 },
fa03ef38 4575#ifdef CONFIG_IPV6_ROUTE_INFO
09c884d4 4576 {
e21e8467
SH		 4577 .procname = "accept_ra_rt_info_max_plen",
4578 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
4579 .maxlen = sizeof(int),
4580 .mode = 0644,
4581 .proc_handler = proc_dointvec,
09c884d4
YH		 4582 },
4583#endif
930d6ff2 4584#endif
fbea49e1 4585 {
e21e8467
SH		 4586 .procname = "proxy_ndp",
4587 .data = &ipv6_devconf.proxy_ndp,
4588 .maxlen = sizeof(int),
4589 .mode = 0644,
4590 .proc_handler = proc_dointvec,
fbea49e1 4591 },
0bcbc926 4592 {
e21e8467
SH		 4593 .procname = "accept_source_route",
4594 .data = &ipv6_devconf.accept_source_route,
4595 .maxlen = sizeof(int),
4596 .mode = 0644,
4597 .proc_handler = proc_dointvec,
0bcbc926 4598 },
95c385b4
NH		 4599#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4600 {
e21e8467
SH		 4601 .procname = "optimistic_dad",
4602 .data = &ipv6_devconf.optimistic_dad,
4603 .maxlen = sizeof(int),
4604 .mode = 0644,
4605 .proc_handler = proc_dointvec,
95c385b4
NH		 4606
4607 },
7bc570c8
YH		 4608#endif
4609#ifdef CONFIG_IPV6_MROUTE
4610 {
e21e8467
SH		 4611 .procname = "mc_forwarding",
4612 .data = &ipv6_devconf.mc_forwarding,
4613 .maxlen = sizeof(int),
4614 .mode = 0444,
4615 .proc_handler = proc_dointvec,
7bc570c8 4616 },
95c385b4 4617#endif
778d80be 4618 {
e21e8467
SH		 4619 .procname = "disable_ipv6",
4620 .data = &ipv6_devconf.disable_ipv6,
4621 .maxlen = sizeof(int),
4622 .mode = 0644,
4623 .proc_handler = addrconf_sysctl_disable,
778d80be 4624 },
1b34be74 4625 {
e21e8467
SH		 4626 .procname = "accept_dad",
4627 .data = &ipv6_devconf.accept_dad,
4628 .maxlen = sizeof(int),
4629 .mode = 0644,
4630 .proc_handler = proc_dointvec,
1b34be74 4631 },
f7734fdf 4632 {
f7734fdf
OP		 4633 .procname = "force_tllao",
4634 .data = &ipv6_devconf.force_tllao,
4635 .maxlen = sizeof(int),
4636 .mode = 0644,
4637 .proc_handler = proc_dointvec
4638 },
1da177e4 4639 {
f8572d8f 4640 /* sentinel */
1da177e4
LT		 4641 }
4642 },
1da177e4
LT		 4643};
4644
bff16c2f 4645static int __addrconf_sysctl_register(struct net *net, char *dev_name,
f8572d8f 4646 struct inet6_dev *idev, struct ipv6_devconf *p)
1da177e4
LT		 4647{
4648 int i;
1da177e4 4649 struct addrconf_sysctl_table *t;
6105e293 4650 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ];
1dab6222 4651
af879cc7 4652 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
1da177e4 4653 if (t == NULL)
f68635e6
PE		 4654 goto out;
4655
bcdd553f 4656 for (i = 0; t->addrconf_vars[i].data; i++) {
e21e8467 4657 t->addrconf_vars[i].data += (char *)p - (char *)&ipv6_devconf;
1da177e4 4658 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
bff16c2f 4659 t->addrconf_vars[i].extra2 = net;
1da177e4 4660 }
1da177e4 4661
6105e293 4662 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name);
1da177e4 4663
6105e293 4664 t->sysctl_header = register_net_sysctl(net, path, t->addrconf_vars);
1da177e4 4665 if (t->sysctl_header == NULL)
6105e293 4666 goto free;
f68635e6
PE		 4667
4668 p->sysctl = t;
95897312 4669 return 0;
1da177e4 4670
f68635e6 4671free:
1da177e4 4672 kfree(t);
f68635e6 4673out:
95897312 4674 return -ENOBUFS;
1da177e4
LT		 4675}
4676
408c4768
PE		 4677static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
4678{
4679 struct addrconf_sysctl_table *t;
4680
4681 if (p->sysctl == NULL)
4682 return;
4683
4684 t = p->sysctl;
4685 p->sysctl = NULL;
ff538818 4686 unregister_net_sysctl_table(t->sysctl_header);
408c4768
PE		 4687 kfree(t);
4688}
4689
f52295a9
PE		 4690static void addrconf_sysctl_register(struct inet6_dev *idev)
4691{
54716e3b 4692 neigh_sysctl_register(idev->dev, idev->nd_parms, "ipv6",
f8572d8f 4693 &ndisc_ifinfo_sysctl_change);
c346dca1 4694 __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
f8572d8f 4695 idev, &idev->cnf);
f52295a9
PE		 4696}
4697
408c4768 4698static void addrconf_sysctl_unregister(struct inet6_dev *idev)
1da177e4 4699{
408c4768
PE		 4700 __addrconf_sysctl_unregister(&idev->cnf);
4701 neigh_sysctl_unregister(idev->nd_parms);
1da177e4
LT		 4702}
4703
4704
4705#endif
4706
2c8c1e72 4707static int __net_init addrconf_init_net(struct net *net)
e0da5a48
PE		 4708{
4709 int err;
4710 struct ipv6_devconf *all, *dflt;
4711
4712 err = -ENOMEM;
4713 all = &ipv6_devconf;
4714 dflt = &ipv6_devconf_dflt;
4715
09ad9bc7 4716 if (!net_eq(net, &init_net)) {
e0da5a48
PE		 4717 all = kmemdup(all, sizeof(ipv6_devconf), GFP_KERNEL);
4718 if (all == NULL)
4719 goto err_alloc_all;
4720
4721 dflt = kmemdup(dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
4722 if (dflt == NULL)
4723 goto err_alloc_dflt;
56d417b1
BH		 4724 } else {
4725 /* these will be inherited by all namespaces */
4726 dflt->autoconf = ipv6_defaults.autoconf;
4727 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
e0da5a48
PE		 4728 }
4729
4730 net->ipv6.devconf_all = all;
4731 net->ipv6.devconf_dflt = dflt;
4732
4733#ifdef CONFIG_SYSCTL
f8572d8f 4734 err = __addrconf_sysctl_register(net, "all", NULL, all);
e0da5a48
PE		 4735 if (err < 0)
4736 goto err_reg_all;
4737
f8572d8f 4738 err = __addrconf_sysctl_register(net, "default", NULL, dflt);
e0da5a48
PE		 4739 if (err < 0)
4740 goto err_reg_dflt;
4741#endif
4742 return 0;
4743
4744#ifdef CONFIG_SYSCTL
4745err_reg_dflt:
4746 __addrconf_sysctl_unregister(all);
4747err_reg_all:
4748 kfree(dflt);
4749#endif
4750err_alloc_dflt:
4751 kfree(all);
4752err_alloc_all:
4753 return err;
4754}
4755
2c8c1e72 4756static void __net_exit addrconf_exit_net(struct net *net)
e0da5a48
PE		 4757{
4758#ifdef CONFIG_SYSCTL
4759 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
4760 __addrconf_sysctl_unregister(net->ipv6.devconf_all);
4761#endif
09ad9bc7 4762 if (!net_eq(net, &init_net)) {
e0da5a48
PE		 4763 kfree(net->ipv6.devconf_dflt);
4764 kfree(net->ipv6.devconf_all);
4765 }
4766}
4767
4768static struct pernet_operations addrconf_ops = {
4769 .init = addrconf_init_net,
4770 .exit = addrconf_exit_net,
4771};
4772
1da177e4
LT		 4773/*
4774 * Device notifier
4775 */
4776
4777int register_inet6addr_notifier(struct notifier_block *nb)
4778{
1ab1457c 4779 return atomic_notifier_chain_register(&inet6addr_chain, nb);
1da177e4 4780}
7159039a
YH		 4781EXPORT_SYMBOL(register_inet6addr_notifier);
4782
1da177e4
LT		 4783int unregister_inet6addr_notifier(struct notifier_block *nb)
4784{
e21e8467 4785 return atomic_notifier_chain_unregister(&inet6addr_chain, nb);
1da177e4 4786}
7159039a
YH		 4787EXPORT_SYMBOL(unregister_inet6addr_notifier);
4788
b382b191
TG		 4789static struct rtnl_af_ops inet6_ops = {
4790 .family = AF_INET6,
4791 .fill_link_af = inet6_fill_link_af,
4792 .get_link_af_size = inet6_get_link_af_size,
b382b191
TG		 4793};
4794
1da177e4
LT		 4795/*
4796 * Init / cleanup code
4797 */
4798
4799int __init addrconf_init(void)
4800{
c2e21293 4801 int i, err;
2a8cc6c8 4802
e21e8467
SH		 4803 err = ipv6_addr_label_init();
4804 if (err < 0) {
f3213831
JP		 4805 pr_crit("%s: cannot initialize default policy table: %d\n",
4806 __func__, err);
2cc6d2bf 4807 goto out;
2a8cc6c8 4808 }
1da177e4 4809
2cc6d2bf
NH		 4810 err = register_pernet_subsys(&addrconf_ops);
4811 if (err < 0)
4812 goto out_addrlabel;
e0da5a48 4813
1da177e4
LT		 4814 /* The addrconf netdev notifier requires that loopback_dev
4815 * has it's ipv6 private information allocated and setup
4816 * before it can bring up and give link-local addresses
4817 * to other devices which are up.
4818 *
4819 * Unfortunately, loopback_dev is not necessarily the first
4820 * entry in the global dev_base list of net devices. In fact,
4821 * it is likely to be the very last entry on that list.
4822 * So this causes the notifier registry below to try and
4823 * give link-local addresses to all devices besides loopback_dev
4824 * first, then loopback_dev, which cases all the non-loopback_dev
4825 * devices to fail to get a link-local address.
4826 *
4827 * So, as a temporary fix, allocate the ipv6 structure for
4828 * loopback_dev first by hand.
4829 * Longer term, all of the dependencies ipv6 has upon the loopback
4830 * device and it being up should be removed.
4831 */
4832 rtnl_lock();
2774c7ab 4833 if (!ipv6_add_dev(init_net.loopback_dev))
1da177e4
LT		 4834 err = -ENOMEM;
4835 rtnl_unlock();
4836 if (err)
e0da5a48 4837 goto errlo;
1da177e4 4838
c2e21293 4839 for (i = 0; i < IN6_ADDR_HSIZE; i++)
4840 INIT_HLIST_HEAD(&inet6_addr_lst[i]);
4841
1da177e4
LT		 4842 register_netdevice_notifier(&ipv6_dev_notf);
4843
1da177e4 4844 addrconf_verify(0);
c127ea2c 4845
b382b191
TG		 4846 err = rtnl_af_register(&inet6_ops);
4847 if (err < 0)
4848 goto errout_af;
4849
c7ac8679
GR		 4850 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo,
4851 NULL);
c127ea2c
TG		 4852 if (err < 0)
4853 goto errout;
4854
4855 /* Only the first call to __rtnl_register can fail */
c7ac8679
GR		 4856 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL, NULL);
4857 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL, NULL);
4858 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr,
4859 inet6_dump_ifaddr, NULL);
4860 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL,
4861 inet6_dump_ifmcaddr, NULL);
4862 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL,
4863 inet6_dump_ifacaddr, NULL);
c127ea2c 4864
2a8cc6c8
YH		 4865 ipv6_addr_label_rtnl_register();
4866
1da177e4 4867 return 0;
c127ea2c 4868errout:
b382b191
TG		 4869 rtnl_af_unregister(&inet6_ops);
4870errout_af:
c127ea2c 4871 unregister_netdevice_notifier(&ipv6_dev_notf);
e0da5a48
PE		 4872errlo:
4873 unregister_pernet_subsys(&addrconf_ops);
2cc6d2bf
NH		 4874out_addrlabel:
4875 ipv6_addr_label_cleanup();
4876out:
c127ea2c 4877 return err;
1da177e4
LT		 4878}
4879
09f7709f 4880void addrconf_cleanup(void)
1da177e4 4881{
176c39af 4882 struct net_device *dev;
1da177e4
LT		 4883 int i;
4884
4885 unregister_netdevice_notifier(&ipv6_dev_notf);
e0da5a48 4886 unregister_pernet_subsys(&addrconf_ops);
2cc6d2bf 4887 ipv6_addr_label_cleanup();
1da177e4
LT		 4888
4889 rtnl_lock();
4890
b382b191
TG		 4891 __rtnl_af_unregister(&inet6_ops);
4892
176c39af
DL		 4893 /* clean dev list */
4894 for_each_netdev(&init_net, dev) {
4895 if (__in6_dev_get(dev) == NULL)
4896 continue;
4897 addrconf_ifdown(dev, 1);
4898 }
4899 addrconf_ifdown(init_net.loopback_dev, 2);
4900
1da177e4
LT		 4901 /*
4902 * Check hash table.
4903 */
5c578aed 4904 spin_lock_bh(&addrconf_hash_lock);
c2e21293 4905 for (i = 0; i < IN6_ADDR_HSIZE; i++)
4906 WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
5c578aed 4907 spin_unlock_bh(&addrconf_hash_lock);
1da177e4
LT		 4908
4909 del_timer(&addr_chk_timer);
1da177e4 4910 rtnl_unlock();
1da177e4 4911}
Linux kernel - Deliverables
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