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ipv6: Use state_lock to protect ifa state
[net-next-2.6.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
1da177e4
LT		 41#include <linux/errno.h>
42#include <linux/types.h>
a0bffffc 43#include <linux/kernel.h>
1da177e4
LT		 44#include <linux/socket.h>
45#include <linux/sockios.h>
1da177e4
LT		 46#include <linux/net.h>
47#include <linux/in6.h>
48#include <linux/netdevice.h>
1823730f 49#include <linux/if_addr.h>
1da177e4
LT		 50#include <linux/if_arp.h>
51#include <linux/if_arcnet.h>
52#include <linux/if_infiniband.h>
53#include <linux/route.h>
54#include <linux/inetdevice.h>
55#include <linux/init.h>
5a0e3ad6 56#include <linux/slab.h>
1da177e4
LT		 57#ifdef CONFIG_SYSCTL
58#include <linux/sysctl.h>
59#endif
4fc268d2 60#include <linux/capability.h>
1da177e4
LT		 61#include <linux/delay.h>
62#include <linux/notifier.h>
543537bd 63#include <linux/string.h>
1da177e4 64
457c4cbc 65#include <net/net_namespace.h>
1da177e4
LT		 66#include <net/sock.h>
67#include <net/snmp.h>
68
69#include <net/ipv6.h>
70#include <net/protocol.h>
71#include <net/ndisc.h>
72#include <net/ip6_route.h>
73#include <net/addrconf.h>
74#include <net/tcp.h>
75#include <net/ip.h>
5d620266 76#include <net/netlink.h>
f24e3d65 77#include <net/pkt_sched.h>
1da177e4
LT		 78#include <linux/if_tunnel.h>
79#include <linux/rtnetlink.h>
80
81#ifdef CONFIG_IPV6_PRIVACY
82#include <linux/random.h>
1da177e4
LT		 83#endif
84
e21e8467 85#include <linux/uaccess.h>
7f7d9a6b 86#include <asm/unaligned.h>
1da177e4
LT		 87
88#include <linux/proc_fs.h>
89#include <linux/seq_file.h>
90
91/* Set to 3 to get tracing... */
92#define ACONF_DEBUG 2
93
94#if ACONF_DEBUG >= 3
95#define ADBG(x) printk x
96#else
97#define ADBG(x)
98#endif
99
100#define INFINITY_LIFE_TIME 0xFFFFFFFF
e21e8467 101#define TIME_DELTA(a, b) ((unsigned long)((long)(a) - (long)(b)))
1da177e4 102
b2db7564
YH		 103#define ADDRCONF_TIMER_FUZZ_MINUS (HZ > 50 ? HZ/50 : 1)
104#define ADDRCONF_TIMER_FUZZ (HZ / 4)
105#define ADDRCONF_TIMER_FUZZ_MAX (HZ)
106
1da177e4 107#ifdef CONFIG_SYSCTL
f52295a9 108static void addrconf_sysctl_register(struct inet6_dev *idev);
408c4768
PE		 109static void addrconf_sysctl_unregister(struct inet6_dev *idev);
110#else
111static inline void addrconf_sysctl_register(struct inet6_dev *idev)
112{
113}
114
115static inline void addrconf_sysctl_unregister(struct inet6_dev *idev)
116{
117}
1da177e4
LT		 118#endif
119
120#ifdef CONFIG_IPV6_PRIVACY
121static int __ipv6_regen_rndid(struct inet6_dev *idev);
1ab1457c 122static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
1da177e4
LT		 123static void ipv6_regen_rndid(unsigned long data);
124
125static int desync_factor = MAX_DESYNC_FACTOR * HZ;
1da177e4
LT		 126#endif
127
1b34be74 128static int ipv6_generate_eui64(u8 *eui, struct net_device *dev);
1da177e4
LT		 129static int ipv6_count_addresses(struct inet6_dev *idev);
130
131/*
132 * Configured unicast address hash table
133 */
c2e21293 134static struct hlist_head inet6_addr_lst[IN6_ADDR_HSIZE];
5c578aed 135static DEFINE_SPINLOCK(addrconf_hash_lock);
1da177e4 136
1da177e4
LT		 137static void addrconf_verify(unsigned long);
138
8d06afab 139static DEFINE_TIMER(addr_chk_timer, addrconf_verify, 0, 0);
1da177e4
LT		 140static DEFINE_SPINLOCK(addrconf_verify_lock);
141
142static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
143static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
144
93d9b7d7
JP		 145static void addrconf_type_change(struct net_device *dev,
146 unsigned long event);
1da177e4
LT		 147static int addrconf_ifdown(struct net_device *dev, int how);
148
e431b8c0 149static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags);
1da177e4
LT		 150static void addrconf_dad_timer(unsigned long data);
151static void addrconf_dad_completed(struct inet6_ifaddr *ifp);
c5e33bdd 152static void addrconf_dad_run(struct inet6_dev *idev);
1da177e4
LT		 153static void addrconf_rs_timer(unsigned long data);
154static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
155static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
156
1ab1457c 157static void inet6_prefix_notify(int event, struct inet6_dev *idev,
1da177e4 158 struct prefix_info *pinfo);
3e81c6da
DM		 159static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
160 struct net_device *dev);
1da177e4 161
e041c683 162static ATOMIC_NOTIFIER_HEAD(inet6addr_chain);
1da177e4 163
888c848e 164static struct ipv6_devconf ipv6_devconf __read_mostly = {
1da177e4
LT		 165 .forwarding = 0,
166 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
167 .mtu6 = IPV6_MIN_MTU,
168 .accept_ra = 1,
169 .accept_redirects = 1,
170 .autoconf = 1,
171 .force_mld_version = 0,
172 .dad_transmits = 1,
173 .rtr_solicits = MAX_RTR_SOLICITATIONS,
174 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
175 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
176#ifdef CONFIG_IPV6_PRIVACY
177 .use_tempaddr = 0,
178 .temp_valid_lft = TEMP_VALID_LIFETIME,
179 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
180 .regen_max_retry = REGEN_MAX_RETRY,
181 .max_desync_factor = MAX_DESYNC_FACTOR,
182#endif
183 .max_addresses = IPV6_MAX_ADDRESSES,
65f5c7c1 184 .accept_ra_defrtr = 1,
c4fd30eb 185 .accept_ra_pinfo = 1,
930d6ff2
YH		 186#ifdef CONFIG_IPV6_ROUTER_PREF
187 .accept_ra_rtr_pref = 1,
52e16356 188 .rtr_probe_interval = 60 * HZ,
09c884d4
YH		 189#ifdef CONFIG_IPV6_ROUTE_INFO
190 .accept_ra_rt_info_max_plen = 0,
191#endif
930d6ff2 192#endif
fbea49e1 193 .proxy_ndp = 0,
0bcbc926 194 .accept_source_route = 0, /* we do not accept RH0 by default. */
778d80be 195 .disable_ipv6 = 0,
1b34be74 196 .accept_dad = 1,
1da177e4
LT		 197};
198
ab32ea5d 199static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
1da177e4
LT		 200 .forwarding = 0,
201 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
202 .mtu6 = IPV6_MIN_MTU,
203 .accept_ra = 1,
204 .accept_redirects = 1,
205 .autoconf = 1,
206 .dad_transmits = 1,
207 .rtr_solicits = MAX_RTR_SOLICITATIONS,
208 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
209 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
210#ifdef CONFIG_IPV6_PRIVACY
211 .use_tempaddr = 0,
212 .temp_valid_lft = TEMP_VALID_LIFETIME,
213 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
214 .regen_max_retry = REGEN_MAX_RETRY,
215 .max_desync_factor = MAX_DESYNC_FACTOR,
216#endif
217 .max_addresses = IPV6_MAX_ADDRESSES,
65f5c7c1 218 .accept_ra_defrtr = 1,
c4fd30eb 219 .accept_ra_pinfo = 1,
930d6ff2
YH		 220#ifdef CONFIG_IPV6_ROUTER_PREF
221 .accept_ra_rtr_pref = 1,
52e16356 222 .rtr_probe_interval = 60 * HZ,
09c884d4
YH		 223#ifdef CONFIG_IPV6_ROUTE_INFO
224 .accept_ra_rt_info_max_plen = 0,
225#endif
930d6ff2 226#endif
fbea49e1 227 .proxy_ndp = 0,
0bcbc926 228 .accept_source_route = 0, /* we do not accept RH0 by default. */
778d80be 229 .disable_ipv6 = 0,
1b34be74 230 .accept_dad = 1,
1da177e4
LT		 231};
232
233/* IPv6 Wildcard Address and Loopback Address defined by RFC2553 */
1da177e4 234const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT;
1da177e4 235const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT;
f3ee4010
YH		 236const struct in6_addr in6addr_linklocal_allnodes = IN6ADDR_LINKLOCAL_ALLNODES_INIT;
237const struct in6_addr in6addr_linklocal_allrouters = IN6ADDR_LINKLOCAL_ALLROUTERS_INIT;
1da177e4 238
f24e3d65 239/* Check if a valid qdisc is available */
05297949 240static inline bool addrconf_qdisc_ok(const struct net_device *dev)
f24e3d65 241{
05297949 242 return !qdisc_tx_is_noop(dev);
f24e3d65
MC		 243}
244
2b5ead46
YH		 245/* Check if a route is valid prefix route */
246static inline int addrconf_is_prefix_route(const struct rt6_info *rt)
247{
248 return ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0);
249}
250
1da177e4
LT		 251static void addrconf_del_timer(struct inet6_ifaddr *ifp)
252{
253 if (del_timer(&ifp->timer))
254 __in6_ifa_put(ifp);
255}
256
e21e8467 257enum addrconf_timer_t {
1da177e4
LT		 258 AC_NONE,
259 AC_DAD,
260 AC_RS,
261};
262
263static void addrconf_mod_timer(struct inet6_ifaddr *ifp,
264 enum addrconf_timer_t what,
265 unsigned long when)
266{
267 if (!del_timer(&ifp->timer))
268 in6_ifa_hold(ifp);
269
270 switch (what) {
271 case AC_DAD:
272 ifp->timer.function = addrconf_dad_timer;
273 break;
274 case AC_RS:
275 ifp->timer.function = addrconf_rs_timer;
276 break;
e21e8467
SH		 277 default:
278 break;
1da177e4
LT		 279 }
280 ifp->timer.expires = jiffies + when;
281 add_timer(&ifp->timer);
282}
283
7f7d9a6b
HX		 284static int snmp6_alloc_dev(struct inet6_dev *idev)
285{
7d720c3e 286 if (snmp_mib_init((void __percpu **)idev->stats.ipv6,
c69bce20 287 sizeof(struct ipstats_mib)) < 0)
7f7d9a6b 288 goto err_ip;
7d720c3e 289 if (snmp_mib_init((void __percpu **)idev->stats.icmpv6,
c69bce20 290 sizeof(struct icmpv6_mib)) < 0)
7f7d9a6b 291 goto err_icmp;
7d720c3e 292 if (snmp_mib_init((void __percpu **)idev->stats.icmpv6msg,
c69bce20 293 sizeof(struct icmpv6msg_mib)) < 0)
14878f75 294 goto err_icmpmsg;
7f7d9a6b
HX		 295
296 return 0;
297
14878f75 298err_icmpmsg:
7d720c3e 299 snmp_mib_free((void __percpu **)idev->stats.icmpv6);
7f7d9a6b 300err_icmp:
7d720c3e 301 snmp_mib_free((void __percpu **)idev->stats.ipv6);
7f7d9a6b 302err_ip:
aaf70ec7 303 return -ENOMEM;
7f7d9a6b
HX		 304}
305
16910b98 306static void snmp6_free_dev(struct inet6_dev *idev)
7f7d9a6b 307{
7d720c3e
TH		 308 snmp_mib_free((void __percpu **)idev->stats.icmpv6msg);
309 snmp_mib_free((void __percpu **)idev->stats.icmpv6);
310 snmp_mib_free((void __percpu **)idev->stats.ipv6);
7f7d9a6b
HX		 311}
312
1da177e4
LT		 313/* Nobody refers to this device, we may destroy it. */
314
8814c4b5
YH		 315static void in6_dev_finish_destroy_rcu(struct rcu_head *head)
316{
317 struct inet6_dev *idev = container_of(head, struct inet6_dev, rcu);
318 kfree(idev);
319}
320
1da177e4
LT		 321void in6_dev_finish_destroy(struct inet6_dev *idev)
322{
323 struct net_device *dev = idev->dev;
547b792c 324
502a2ffd 325 WARN_ON(!list_empty(&idev->addr_list));
547b792c
IJ		 326 WARN_ON(idev->mc_list != NULL);
327
1da177e4
LT		 328#ifdef NET_REFCNT_DEBUG
329 printk(KERN_DEBUG "in6_dev_finish_destroy: %s\n", dev ? dev->name : "NIL");
330#endif
331 dev_put(dev);
332 if (!idev->dead) {
e21e8467 333 pr_warning("Freeing alive inet6 device %p\n", idev);
1da177e4
LT		 334 return;
335 }
336 snmp6_free_dev(idev);
8814c4b5 337 call_rcu(&idev->rcu, in6_dev_finish_destroy_rcu);
1da177e4
LT		 338}
339
7159039a
YH		 340EXPORT_SYMBOL(in6_dev_finish_destroy);
341
1da177e4
LT		 342static struct inet6_dev * ipv6_add_dev(struct net_device *dev)
343{
344 struct inet6_dev *ndev;
345
346 ASSERT_RTNL();
347
348 if (dev->mtu < IPV6_MIN_MTU)
349 return NULL;
350
1ab1457c 351 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
322f74a4 352
1ab1457c
YH		 353 if (ndev == NULL)
354 return NULL;
322f74a4
IO		 355
356 rwlock_init(&ndev->lock);
357 ndev->dev = dev;
502a2ffd 358 INIT_LIST_HEAD(&ndev->addr_list);
359
c346dca1 360 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf));
322f74a4
IO		 361 ndev->cnf.mtu6 = dev->mtu;
362 ndev->cnf.sysctl = NULL;
363 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
364 if (ndev->nd_parms == NULL) {
365 kfree(ndev);
366 return NULL;
367 }
0187bdfb
BH		 368 if (ndev->cnf.forwarding)
369 dev_disable_lro(dev);
322f74a4
IO		 370 /* We refer to the device */
371 dev_hold(dev);
1da177e4 372
322f74a4
IO		 373 if (snmp6_alloc_dev(ndev) < 0) {
374 ADBG((KERN_WARNING
375 "%s(): cannot allocate memory for statistics; dev=%s.\n",
0dc47877 376 __func__, dev->name));
322f74a4
IO		 377 neigh_parms_release(&nd_tbl, ndev->nd_parms);
378 ndev->dead = 1;
379 in6_dev_finish_destroy(ndev);
380 return NULL;
381 }
1da177e4 382
322f74a4
IO		 383 if (snmp6_register_dev(ndev) < 0) {
384 ADBG((KERN_WARNING
385 "%s(): cannot create /proc/net/dev_snmp6/%s\n",
0dc47877 386 __func__, dev->name));
322f74a4
IO		 387 neigh_parms_release(&nd_tbl, ndev->nd_parms);
388 ndev->dead = 1;
389 in6_dev_finish_destroy(ndev);
390 return NULL;
391 }
392
393 /* One reference from device. We must do this before
394 * we invoke __ipv6_regen_rndid().
395 */
396 in6_dev_hold(ndev);
1da177e4 397
1b34be74
YH		 398 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
399 ndev->cnf.accept_dad = -1;
400
b077d7ab
YH		 401#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
402 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
403 printk(KERN_INFO
404 "%s: Disabled Multicast RS\n",
405 dev->name);
406 ndev->cnf.rtr_solicits = 0;
407 }
408#endif
409
1da177e4 410#ifdef CONFIG_IPV6_PRIVACY
372e6c8f 411 INIT_LIST_HEAD(&ndev->tempaddr_list);
b24b8a24 412 setup_timer(&ndev->regen_timer, ipv6_regen_rndid, (unsigned long)ndev);
322f74a4
IO		 413 if ((dev->flags&IFF_LOOPBACK) ||
414 dev->type == ARPHRD_TUNNEL ||
9625ed72 415 dev->type == ARPHRD_TUNNEL6 ||
0be669bb 416 dev->type == ARPHRD_SIT ||
0be669bb 417 dev->type == ARPHRD_NONE) {
322f74a4
IO		 418 printk(KERN_INFO
419 "%s: Disabled Privacy Extensions\n",
420 dev->name);
421 ndev->cnf.use_tempaddr = -1;
422 } else {
423 in6_dev_hold(ndev);
424 ipv6_regen_rndid((unsigned long) ndev);
425 }
1da177e4
LT		 426#endif
427
f24e3d65 428 if (netif_running(dev) && addrconf_qdisc_ok(dev))
53aadcc9
HX		 429 ndev->if_flags |= IF_READY;
430
322f74a4
IO		 431 ipv6_mc_init_dev(ndev);
432 ndev->tstamp = jiffies;
f52295a9 433 addrconf_sysctl_register(ndev);
30c4cf57
DS		 434 /* protected by rtnl_lock */
435 rcu_assign_pointer(dev->ip6_ptr, ndev);
d88ae4cc
YH		 436
437 /* Join all-node multicast group */
f3ee4010 438 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);
d88ae4cc 439
1da177e4
LT		 440 return ndev;
441}
442
cee89473 443static struct inet6_dev * ipv6_find_idev(struct net_device *dev)
1da177e4
LT		 444{
445 struct inet6_dev *idev;
446
447 ASSERT_RTNL();
448
e21e8467
SH		 449 idev = __in6_dev_get(dev);
450 if (!idev) {
451 idev = ipv6_add_dev(dev);
452 if (!idev)
1da177e4
LT		 453 return NULL;
454 }
c5e33bdd 455
1da177e4
LT		 456 if (dev->flags&IFF_UP)
457 ipv6_mc_up(idev);
458 return idev;
459}
460
461#ifdef CONFIG_SYSCTL
462static void dev_forward_change(struct inet6_dev *idev)
463{
464 struct net_device *dev;
465 struct inet6_ifaddr *ifa;
1da177e4
LT		 466
467 if (!idev)
468 return;
469 dev = idev->dev;
0187bdfb
BH		 470 if (idev->cnf.forwarding)
471 dev_disable_lro(dev);
1da177e4 472 if (dev && (dev->flags & IFF_MULTICAST)) {
1da177e4 473 if (idev->cnf.forwarding)
f3ee4010 474 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
1da177e4 475 else
f3ee4010 476 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
1da177e4 477 }
502a2ffd 478
479 list_for_each_entry(ifa, &idev->addr_list, if_list) {
2c12a74c
MW		 480 if (ifa->flags&IFA_F_TENTATIVE)
481 continue;
1da177e4
LT		 482 if (idev->cnf.forwarding)
483 addrconf_join_anycast(ifa);
484 else
485 addrconf_leave_anycast(ifa);
486 }
487}
488
489
e186932b 490static void addrconf_forward_change(struct net *net, __s32 newf)
1da177e4
LT		 491{
492 struct net_device *dev;
493 struct inet6_dev *idev;
494
c6d14c84
ED		 495 rcu_read_lock();
496 for_each_netdev_rcu(net, dev) {
1da177e4
LT		 497 idev = __in6_dev_get(dev);
498 if (idev) {
e186932b
PE		 499 int changed = (!idev->cnf.forwarding) ^ (!newf);
500 idev->cnf.forwarding = newf;
1da177e4
LT		 501 if (changed)
502 dev_forward_change(idev);
503 }
1da177e4 504 }
c6d14c84 505 rcu_read_unlock();
1da177e4 506}
c8fecf22 507
b325fddb 508static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int old)
c8fecf22 509{
bff16c2f
PE		 510 struct net *net;
511
512 net = (struct net *)table->extra2;
441fc2a2 513 if (p == &net->ipv6.devconf_dflt->forwarding)
b325fddb
SH		 514 return 0;
515
88af182e
EB		 516 if (!rtnl_trylock()) {
517 /* Restore the original values before restarting */
518 *p = old;
5007392d 519 return restart_syscall();
88af182e 520 }
c8fecf22 521
e186932b
PE		 522 if (p == &net->ipv6.devconf_all->forwarding) {
523 __s32 newf = net->ipv6.devconf_all->forwarding;
524 net->ipv6.devconf_dflt->forwarding = newf;
525 addrconf_forward_change(net, newf);
c8fecf22
PE		 526 } else if ((!*p) ^ (!old))
527 dev_forward_change((struct inet6_dev *)table->extra1);
0187bdfb 528 rtnl_unlock();
c8fecf22
PE		 529
530 if (*p)
7b4da532 531 rt6_purge_dflt_routers(net);
b325fddb 532 return 1;
c8fecf22 533}
1da177e4
LT		 534#endif
535
5c578aed 536static void inet6_ifa_finish_destroy_rcu(struct rcu_head *head)
537{
538 struct inet6_ifaddr *ifp = container_of(head, struct inet6_ifaddr, rcu);
539 kfree(ifp);
540}
1da177e4 541
5c578aed 542/* Nobody refers to this ifaddr, destroy it */
1da177e4
LT		 543void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
544{
c2e21293 545 WARN_ON(!hlist_unhashed(&ifp->addr_lst));
547b792c 546
1da177e4
LT		 547#ifdef NET_REFCNT_DEBUG
548 printk(KERN_DEBUG "inet6_ifa_finish_destroy\n");
549#endif
550
551 in6_dev_put(ifp->idev);
552
553 if (del_timer(&ifp->timer))
e21e8467 554 pr_notice("Timer is still running, when freeing ifa=%p\n", ifp);
1da177e4 555
e9d3e084 556 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
e21e8467 557 pr_warning("Freeing alive inet6 address %p\n", ifp);
1da177e4
LT		 558 return;
559 }
560 dst_release(&ifp->rt->u.dst);
561
5c578aed 562 call_rcu(&ifp->rcu, inet6_ifa_finish_destroy_rcu);
1da177e4
LT		 563}
564
e55ffac6
BH		 565static void
566ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
567{
502a2ffd 568 struct list_head *p;
8a6ce0c0 569 int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
e55ffac6
BH		 570
571 /*
572 * Each device address list is sorted in order of scope -
573 * global before linklocal.
574 */
502a2ffd 575 list_for_each(p, &idev->addr_list) {
576 struct inet6_ifaddr *ifa
577 = list_entry(p, struct inet6_ifaddr, if_list);
8a6ce0c0 578 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
e55ffac6
BH		 579 break;
580 }
581
b54c9b98 582 list_add_tail(&ifp->if_list, p);
e55ffac6
BH		 583}
584
3a88a81d 585static u32 ipv6_addr_hash(const struct in6_addr *addr)
3eb84f49 586{
3eb84f49
YH		 587 /*
588 * We perform the hash function over the last 64 bits of the address
589 * This will include the IEEE address token on links that support it.
590 */
0eae88f3
ED		 591 return jhash_2words((__force u32)addr->s6_addr32[2],
592 (__force u32)addr->s6_addr32[3], 0)
3a88a81d 593 & (IN6_ADDR_HSIZE - 1);
3eb84f49
YH		 594}
595
1da177e4
LT		 596/* On success it returns ifp with increased reference count */
597
598static struct inet6_ifaddr *
599ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, int pfxlen,
e431b8c0 600 int scope, u32 flags)
1da177e4
LT		 601{
602 struct inet6_ifaddr *ifa = NULL;
603 struct rt6_info *rt;
3a88a81d 604 unsigned int hash;
1da177e4 605 int err = 0;
d68b8270
YH		 606 int addr_type = ipv6_addr_type(addr);
607
608 if (addr_type == IPV6_ADDR_ANY ||
609 addr_type & IPV6_ADDR_MULTICAST ||
610 (!(idev->dev->flags & IFF_LOOPBACK) &&
611 addr_type & IPV6_ADDR_LOOPBACK))
612 return ERR_PTR(-EADDRNOTAVAIL);
1da177e4 613
8814c4b5 614 rcu_read_lock_bh();
1da177e4
LT		 615 if (idev->dead) {
616 err = -ENODEV; /*XXX*/
617 goto out2;
618 }
619
56d417b1 620 if (idev->cnf.disable_ipv6) {
9bdd8d40
BH		 621 err = -EACCES;
622 goto out2;
623 }
624
5c578aed 625 spin_lock(&addrconf_hash_lock);
1da177e4
LT		 626
627 /* Ignore adding duplicate addresses on an interface */
c346dca1 628 if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) {
1da177e4
LT		 629 ADBG(("ipv6_add_addr: already assigned\n"));
630 err = -EEXIST;
631 goto out;
632 }
633
322f74a4 634 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
1da177e4
LT		 635
636 if (ifa == NULL) {
637 ADBG(("ipv6_add_addr: malloc failed\n"));
638 err = -ENOBUFS;
639 goto out;
640 }
641
642 rt = addrconf_dst_alloc(idev, addr, 0);
643 if (IS_ERR(rt)) {
644 err = PTR_ERR(rt);
645 goto out;
646 }
647
1da177e4
LT		 648 ipv6_addr_copy(&ifa->addr, addr);
649
650 spin_lock_init(&ifa->lock);
e9d3e084 651 spin_lock_init(&ifa->state_lock);
1da177e4 652 init_timer(&ifa->timer);
c2e21293 653 INIT_HLIST_NODE(&ifa->addr_lst);
1da177e4
LT		 654 ifa->timer.data = (unsigned long) ifa;
655 ifa->scope = scope;
656 ifa->prefix_len = pfxlen;
657 ifa->flags = flags | IFA_F_TENTATIVE;
658 ifa->cstamp = ifa->tstamp = jiffies;
659
57f5f544
KF		 660 ifa->rt = rt;
661
95c385b4
NH		 662 /*
663 * part one of RFC 4429, section 3.3
664 * We should not configure an address as
665 * optimistic if we do not yet know the link
666 * layer address of our nexhop router
667 */
668
669 if (rt->rt6i_nexthop == NULL)
670 ifa->flags &= ~IFA_F_OPTIMISTIC;
671
1da177e4
LT		 672 ifa->idev = idev;
673 in6_dev_hold(idev);
674 /* For caller */
675 in6_ifa_hold(ifa);
676
677 /* Add to big hash table */
678 hash = ipv6_addr_hash(addr);
679
5c578aed 680 hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]);
5c578aed 681 spin_unlock(&addrconf_hash_lock);
1da177e4
LT		 682
683 write_lock(&idev->lock);
684 /* Add to inet6_dev unicast addr list. */
e55ffac6 685 ipv6_link_dev_addr(idev, ifa);
1da177e4
LT		 686
687#ifdef CONFIG_IPV6_PRIVACY
688 if (ifa->flags&IFA_F_TEMPORARY) {
372e6c8f 689 list_add(&ifa->tmp_list, &idev->tempaddr_list);
1da177e4
LT		 690 in6_ifa_hold(ifa);
691 }
692#endif
693
1da177e4
LT		 694 in6_ifa_hold(ifa);
695 write_unlock(&idev->lock);
696out2:
8814c4b5 697 rcu_read_unlock_bh();
1da177e4 698
fd92833a 699 if (likely(err == 0))
e041c683 700 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_UP, ifa);
1da177e4
LT		 701 else {
702 kfree(ifa);
703 ifa = ERR_PTR(err);
704 }
705
706 return ifa;
707out:
5c578aed 708 spin_unlock(&addrconf_hash_lock);
1da177e4
LT		 709 goto out2;
710}
711
712/* This function wants to get referenced ifp and releases it before return */
713
714static void ipv6_del_addr(struct inet6_ifaddr *ifp)
715{
502a2ffd 716 struct inet6_ifaddr *ifa, *ifn;
1da177e4 717 struct inet6_dev *idev = ifp->idev;
4c5ff6a6 718 int state;
1da177e4
LT		 719 int hash;
720 int deleted = 0, onlink = 0;
721 unsigned long expires = jiffies;
722
723 hash = ipv6_addr_hash(&ifp->addr);
724
4c5ff6a6
HX		 725 spin_lock_bh(&ifp->state_lock);
726 state = ifp->state;
e9d3e084 727 ifp->state = INET6_IFADDR_STATE_DEAD;
4c5ff6a6
HX		 728 spin_unlock_bh(&ifp->state_lock);
729
730 if (state == INET6_IFADDR_STATE_DEAD)
731 goto out;
1da177e4 732
5c578aed 733 spin_lock_bh(&addrconf_hash_lock);
734 hlist_del_init_rcu(&ifp->addr_lst);
5c578aed 735 spin_unlock_bh(&addrconf_hash_lock);
1da177e4
LT		 736
737 write_lock_bh(&idev->lock);
738#ifdef CONFIG_IPV6_PRIVACY
739 if (ifp->flags&IFA_F_TEMPORARY) {
372e6c8f 740 list_del(&ifp->tmp_list);
741 if (ifp->ifpub) {
742 in6_ifa_put(ifp->ifpub);
743 ifp->ifpub = NULL;
1da177e4 744 }
372e6c8f 745 __in6_ifa_put(ifp);
1da177e4
LT		 746 }
747#endif
748
502a2ffd 749 list_for_each_entry_safe(ifa, ifn, &idev->addr_list, if_list) {
1da177e4 750 if (ifa == ifp) {
502a2ffd 751 list_del_init(&ifp->if_list);
1da177e4 752 __in6_ifa_put(ifp);
502a2ffd 753
1da177e4
LT		 754 if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0)
755 break;
756 deleted = 1;
1d142804 757 continue;
1da177e4
LT		 758 } else if (ifp->flags & IFA_F_PERMANENT) {
759 if (ipv6_prefix_equal(&ifa->addr, &ifp->addr,
760 ifp->prefix_len)) {
761 if (ifa->flags & IFA_F_PERMANENT) {
762 onlink = 1;
763 if (deleted)
764 break;
765 } else {
766 unsigned long lifetime;
767
768 if (!onlink)
769 onlink = -1;
770
771 spin_lock(&ifa->lock);
4bed72e4
YH		 772
773 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
774 /*
775 * Note: Because this address is
776 * not permanent, lifetime <
777 * LONG_MAX / HZ here.
778 */
1da177e4
LT		 779 if (time_before(expires,
780 ifa->tstamp + lifetime * HZ))
781 expires = ifa->tstamp + lifetime * HZ;
782 spin_unlock(&ifa->lock);
783 }
784 }
785 }
786 }
787 write_unlock_bh(&idev->lock);
788
b2238566
AV		 789 addrconf_del_timer(ifp);
790
1da177e4
LT		 791 ipv6_ifa_notify(RTM_DELADDR, ifp);
792
e041c683 793 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifp);
1da177e4 794
1da177e4
LT		 795 /*
796 * Purge or update corresponding prefix
797 *
798 * 1) we don't purge prefix here if address was not permanent.
799 * prefix is managed by its own lifetime.
800 * 2) if there're no addresses, delete prefix.
801 * 3) if there're still other permanent address(es),
802 * corresponding prefix is still permanent.
803 * 4) otherwise, update prefix lifetime to the
804 * longest valid lifetime among the corresponding
805 * addresses on the device.
806 * Note: subsequent RA will update lifetime.
807 *
808 * --yoshfuji
809 */
810 if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) {
811 struct in6_addr prefix;
812 struct rt6_info *rt;
c346dca1 813 struct net *net = dev_net(ifp->idev->dev);
1da177e4 814 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len);
6fda7350 815 rt = rt6_lookup(net, &prefix, NULL, ifp->idev->dev->ifindex, 1);
1da177e4 816
2b5ead46 817 if (rt && addrconf_is_prefix_route(rt)) {
1da177e4 818 if (onlink == 0) {
e0a1ad73 819 ip6_del_rt(rt);
1da177e4
LT		 820 rt = NULL;
821 } else if (!(rt->rt6i_flags & RTF_EXPIRES)) {
822 rt->rt6i_expires = expires;
823 rt->rt6i_flags |= RTF_EXPIRES;
824 }
825 }
826 dst_release(&rt->u.dst);
827 }
828
4c5ff6a6 829out:
1da177e4
LT		 830 in6_ifa_put(ifp);
831}
832
833#ifdef CONFIG_IPV6_PRIVACY
834static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
835{
836 struct inet6_dev *idev = ifp->idev;
837 struct in6_addr addr, *tmpaddr;
838 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_cstamp, tmp_tstamp;
eac55bf9 839 unsigned long regen_advance;
1da177e4
LT		 840 int tmp_plen;
841 int ret = 0;
842 int max_addresses;
95c385b4 843 u32 addr_flags;
1da177e4
LT		 844
845 write_lock(&idev->lock);
846 if (ift) {
847 spin_lock_bh(&ift->lock);
848 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
849 spin_unlock_bh(&ift->lock);
850 tmpaddr = &addr;
851 } else {
852 tmpaddr = NULL;
853 }
854retry:
855 in6_dev_hold(idev);
856 if (idev->cnf.use_tempaddr <= 0) {
857 write_unlock(&idev->lock);
858 printk(KERN_INFO
859 "ipv6_create_tempaddr(): use_tempaddr is disabled.\n");
860 in6_dev_put(idev);
861 ret = -1;
862 goto out;
863 }
864 spin_lock_bh(&ifp->lock);
865 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
866 idev->cnf.use_tempaddr = -1; /*XXX*/
867 spin_unlock_bh(&ifp->lock);
868 write_unlock(&idev->lock);
869 printk(KERN_WARNING
870 "ipv6_create_tempaddr(): regeneration time exceeded. disabled temporary address support.\n");
871 in6_dev_put(idev);
872 ret = -1;
873 goto out;
874 }
875 in6_ifa_hold(ifp);
876 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
877 if (__ipv6_try_regen_rndid(idev, tmpaddr) < 0) {
878 spin_unlock_bh(&ifp->lock);
879 write_unlock(&idev->lock);
880 printk(KERN_WARNING
881 "ipv6_create_tempaddr(): regeneration of randomized interface id failed.\n");
882 in6_ifa_put(ifp);
883 in6_dev_put(idev);
884 ret = -1;
885 goto out;
886 }
887 memcpy(&addr.s6_addr[8], idev->rndid, 8);
888 tmp_valid_lft = min_t(__u32,
889 ifp->valid_lft,
890 idev->cnf.temp_valid_lft);
1ab1457c
YH		 891 tmp_prefered_lft = min_t(__u32,
892 ifp->prefered_lft,
1da177e4
LT		 893 idev->cnf.temp_prefered_lft - desync_factor / HZ);
894 tmp_plen = ifp->prefix_len;
895 max_addresses = idev->cnf.max_addresses;
896 tmp_cstamp = ifp->cstamp;
897 tmp_tstamp = ifp->tstamp;
898 spin_unlock_bh(&ifp->lock);
899
eac55bf9
BB		 900 regen_advance = idev->cnf.regen_max_retry *
901 idev->cnf.dad_transmits *
902 idev->nd_parms->retrans_time / HZ;
1da177e4 903 write_unlock(&idev->lock);
95c385b4 904
eac55bf9
BB		 905 /* A temporary address is created only if this calculated Preferred
906 * Lifetime is greater than REGEN_ADVANCE time units. In particular,
907 * an implementation must not create a temporary address with a zero
908 * Preferred Lifetime.
909 */
910 if (tmp_prefered_lft <= regen_advance) {
911 in6_ifa_put(ifp);
912 in6_dev_put(idev);
913 ret = -1;
914 goto out;
915 }
916
95c385b4
NH		 917 addr_flags = IFA_F_TEMPORARY;
918 /* set in addrconf_prefix_rcv() */
919 if (ifp->flags & IFA_F_OPTIMISTIC)
920 addr_flags |= IFA_F_OPTIMISTIC;
921
1da177e4 922 ift = !max_addresses ||
1ab1457c 923 ipv6_count_addresses(idev) < max_addresses ?
1da177e4 924 ipv6_add_addr(idev, &addr, tmp_plen,
95c385b4
NH		 925 ipv6_addr_type(&addr)&IPV6_ADDR_SCOPE_MASK,
926 addr_flags) : NULL;
1da177e4
LT		 927 if (!ift || IS_ERR(ift)) {
928 in6_ifa_put(ifp);
929 in6_dev_put(idev);
930 printk(KERN_INFO
931 "ipv6_create_tempaddr(): retry temporary address regeneration.\n");
932 tmpaddr = &addr;
933 write_lock(&idev->lock);
934 goto retry;
935 }
936
937 spin_lock_bh(&ift->lock);
938 ift->ifpub = ifp;
939 ift->valid_lft = tmp_valid_lft;
940 ift->prefered_lft = tmp_prefered_lft;
941 ift->cstamp = tmp_cstamp;
942 ift->tstamp = tmp_tstamp;
943 spin_unlock_bh(&ift->lock);
944
945 addrconf_dad_start(ift, 0);
946 in6_ifa_put(ift);
947 in6_dev_put(idev);
948out:
949 return ret;
950}
951#endif
952
953/*
072047e4 954 * Choose an appropriate source address (RFC3484)
1da177e4 955 */
a9b05723
YH		 956enum {
957 IPV6_SADDR_RULE_INIT = 0,
958 IPV6_SADDR_RULE_LOCAL,
959 IPV6_SADDR_RULE_SCOPE,
960 IPV6_SADDR_RULE_PREFERRED,
961#ifdef CONFIG_IPV6_MIP6
962 IPV6_SADDR_RULE_HOA,
963#endif
964 IPV6_SADDR_RULE_OIF,
965 IPV6_SADDR_RULE_LABEL,
966#ifdef CONFIG_IPV6_PRIVACY
967 IPV6_SADDR_RULE_PRIVACY,
968#endif
969 IPV6_SADDR_RULE_ORCHID,
970 IPV6_SADDR_RULE_PREFIX,
971 IPV6_SADDR_RULE_MAX
972};
973
072047e4 974struct ipv6_saddr_score {
a9b05723
YH		 975 int rule;
976 int addr_type;
977 struct inet6_ifaddr *ifa;
978 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
979 int scopedist;
980 int matchlen;
072047e4
YH		 981};
982
a9b05723 983struct ipv6_saddr_dst {
9acd9f3a 984 const struct in6_addr *addr;
a9b05723
YH		 985 int ifindex;
986 int scope;
987 int label;
7cbca67c 988 unsigned int prefs;
a9b05723 989};
072047e4 990
b6f99a21 991static inline int ipv6_saddr_preferred(int type)
1da177e4 992{
45bb0060 993 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
072047e4
YH		 994 return 1;
995 return 0;
1da177e4
LT		 996}
997
3de23255
BT		 998static int ipv6_get_saddr_eval(struct net *net,
999 struct ipv6_saddr_score *score,
a9b05723
YH		 1000 struct ipv6_saddr_dst *dst,
1001 int i)
1002{
1003 int ret;
1004
1005 if (i <= score->rule) {
1006 switch (i) {
1007 case IPV6_SADDR_RULE_SCOPE:
1008 ret = score->scopedist;
1009 break;
1010 case IPV6_SADDR_RULE_PREFIX:
1011 ret = score->matchlen;
1012 break;
1013 default:
1014 ret = !!test_bit(i, score->scorebits);
1015 }
1016 goto out;
1017 }
1018
1019 switch (i) {
1020 case IPV6_SADDR_RULE_INIT:
1021 /* Rule 0: remember if hiscore is not ready yet */
1022 ret = !!score->ifa;
1023 break;
1024 case IPV6_SADDR_RULE_LOCAL:
1025 /* Rule 1: Prefer same address */
1026 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1027 break;
1028 case IPV6_SADDR_RULE_SCOPE:
1029 /* Rule 2: Prefer appropriate scope
1030 *
1031 * ret
1032 * ^
1033 * -1 | d 15
1034 * ---+--+-+---> scope
1035 * |
1036 * | d is scope of the destination.
1037 * B-d | \
1038 * | \ <- smaller scope is better if
1039 * B-15 | \ if scope is enough for destinaion.
1040 * | ret = B - scope (-1 <= scope >= d <= 15).
1041 * d-C-1 | /
1042 * |/ <- greater is better
1043 * -C / if scope is not enough for destination.
1044 * /| ret = scope - C (-1 <= d < scope <= 15).
1045 *
1046 * d - C - 1 < B -15 (for all -1 <= d <= 15).
1047 * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1048 * Assume B = 0 and we get C > 29.
1049 */
1050 ret = __ipv6_addr_src_scope(score->addr_type);
1051 if (ret >= dst->scope)
1052 ret = -ret;
1053 else
1054 ret -= 128; /* 30 is enough */
1055 score->scopedist = ret;
1056 break;
1057 case IPV6_SADDR_RULE_PREFERRED:
1058 /* Rule 3: Avoid deprecated and optimistic addresses */
1059 ret = ipv6_saddr_preferred(score->addr_type) ||
1060 !(score->ifa->flags & (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC));
1061 break;
1062#ifdef CONFIG_IPV6_MIP6
1063 case IPV6_SADDR_RULE_HOA:
7cbca67c 1064 {
a9b05723 1065 /* Rule 4: Prefer home address */
7cbca67c
YH		 1066 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1067 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
a9b05723 1068 break;
7cbca67c 1069 }
a9b05723
YH		 1070#endif
1071 case IPV6_SADDR_RULE_OIF:
1072 /* Rule 5: Prefer outgoing interface */
1073 ret = (!dst->ifindex ||
1074 dst->ifindex == score->ifa->idev->dev->ifindex);
1075 break;
1076 case IPV6_SADDR_RULE_LABEL:
1077 /* Rule 6: Prefer matching label */
3de23255
BT		 1078 ret = ipv6_addr_label(net,
1079 &score->ifa->addr, score->addr_type,
a9b05723
YH		 1080 score->ifa->idev->dev->ifindex) == dst->label;
1081 break;
1082#ifdef CONFIG_IPV6_PRIVACY
1083 case IPV6_SADDR_RULE_PRIVACY:
7cbca67c 1084 {
a9b05723
YH		 1085 /* Rule 7: Prefer public address
1086 * Note: prefer temprary address if use_tempaddr >= 2
1087 */
7cbca67c
YH		 1088 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1089 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1090 score->ifa->idev->cnf.use_tempaddr >= 2;
1091 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
a9b05723 1092 break;
7cbca67c 1093 }
a9b05723
YH		 1094#endif
1095 case IPV6_SADDR_RULE_ORCHID:
1096 /* Rule 8-: Prefer ORCHID vs ORCHID or
1097 * non-ORCHID vs non-ORCHID
1098 */
1099 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1100 ipv6_addr_orchid(dst->addr));
1101 break;
1102 case IPV6_SADDR_RULE_PREFIX:
1103 /* Rule 8: Use longest matching prefix */
1104 score->matchlen = ret = ipv6_addr_diff(&score->ifa->addr,
1105 dst->addr);
1106 break;
1107 default:
1108 ret = 0;
1109 }
1110
1111 if (ret)
1112 __set_bit(i, score->scorebits);
1113 score->rule = i;
1114out:
1115 return ret;
1116}
1117
191cd582 1118int ipv6_dev_get_saddr(struct net *net, struct net_device *dst_dev,
9acd9f3a 1119 const struct in6_addr *daddr, unsigned int prefs,
7cbca67c 1120 struct in6_addr *saddr)
1da177e4 1121{
a9b05723
YH		 1122 struct ipv6_saddr_score scores[2],
1123 *score = &scores[0], *hiscore = &scores[1];
a9b05723 1124 struct ipv6_saddr_dst dst;
072047e4 1125 struct net_device *dev;
a9b05723 1126 int dst_type;
1da177e4 1127
a9b05723
YH		 1128 dst_type = __ipv6_addr_type(daddr);
1129 dst.addr = daddr;
1130 dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1131 dst.scope = __ipv6_addr_src_scope(dst_type);
3de23255 1132 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
7cbca67c 1133 dst.prefs = prefs;
a9b05723
YH		 1134
1135 hiscore->rule = -1;
1136 hiscore->ifa = NULL;
1da177e4 1137
8814c4b5 1138 rcu_read_lock();
1da177e4 1139
c6d14c84 1140 for_each_netdev_rcu(net, dev) {
072047e4 1141 struct inet6_dev *idev;
072047e4 1142
a9b05723 1143 /* Candidate Source Address (section 4)
072047e4
YH		 1144 * - multicast and link-local destination address,
1145 * the set of candidate source address MUST only
1146 * include addresses assigned to interfaces
1147 * belonging to the same link as the outgoing
1148 * interface.
1149 * (- For site-local destination addresses, the
1150 * set of candidate source addresses MUST only
1151 * include addresses assigned to interfaces
1152 * belonging to the same site as the outgoing
1153 * interface.)
1154 */
a9b05723
YH		 1155 if (((dst_type & IPV6_ADDR_MULTICAST) ||
1156 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL) &&
1157 dst.ifindex && dev->ifindex != dst.ifindex)
072047e4 1158 continue;
1da177e4 1159
1da177e4 1160 idev = __in6_dev_get(dev);
072047e4
YH		 1161 if (!idev)
1162 continue;
1163
1164 read_lock_bh(&idev->lock);
502a2ffd 1165 list_for_each_entry(score->ifa, &idev->addr_list, if_list) {
a9b05723 1166 int i;
072047e4 1167
a9b05723 1168 /*
6b3ae80a
YH		 1169 * - Tentative Address (RFC2462 section 5.4)
1170 * - A tentative address is not considered
1171 * "assigned to an interface" in the traditional
95c385b4 1172 * sense, unless it is also flagged as optimistic.
6b3ae80a 1173 * - Candidate Source Address (section 4)
072047e4
YH		 1174 * - In any case, anycast addresses, multicast
1175 * addresses, and the unspecified address MUST
1176 * NOT be included in a candidate set.
1177 */
a9b05723
YH		 1178 if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1179 (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
6b3ae80a 1180 continue;
a9b05723
YH		 1181
1182 score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1183
1184 if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1185 score->addr_type & IPV6_ADDR_MULTICAST)) {
072047e4 1186 LIMIT_NETDEBUG(KERN_DEBUG
3b6d821c 1187 "ADDRCONF: unspecified / multicast address "
072047e4
YH		 1188 "assigned as unicast address on %s",
1189 dev->name);
1190 continue;
1191 }
1192
a9b05723
YH		 1193 score->rule = -1;
1194 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1195
1196 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1197 int minihiscore, miniscore;
1198
3de23255
BT		 1199 minihiscore = ipv6_get_saddr_eval(net, hiscore, &dst, i);
1200 miniscore = ipv6_get_saddr_eval(net, score, &dst, i);
a9b05723
YH		 1201
1202 if (minihiscore > miniscore) {
1203 if (i == IPV6_SADDR_RULE_SCOPE &&
1204 score->scopedist > 0) {
1205 /*
1206 * special case:
1207 * each remaining entry
1208 * has too small (not enough)
1209 * scope, because ifa entries
1210 * are sorted by their scope
1211 * values.
1212 */
1213 goto try_nextdev;
1214 }
1215 break;
1216 } else if (minihiscore < miniscore) {
a9b05723
YH		 1217 if (hiscore->ifa)
1218 in6_ifa_put(hiscore->ifa);
1219
1220 in6_ifa_hold(score->ifa);
1221
a0bffffc 1222 swap(hiscore, score);
a9b05723
YH		 1223
1224 /* restore our iterator */
1225 score->ifa = hiscore->ifa;
1226
1227 break;
1da177e4 1228 }
072047e4 1229 }
1da177e4 1230 }
a9b05723 1231try_nextdev:
072047e4 1232 read_unlock_bh(&idev->lock);
1da177e4 1233 }
8814c4b5 1234 rcu_read_unlock();
1da177e4 1235
a9b05723 1236 if (!hiscore->ifa)
072047e4 1237 return -EADDRNOTAVAIL;
1ab1457c 1238
a9b05723
YH		 1239 ipv6_addr_copy(saddr, &hiscore->ifa->addr);
1240 in6_ifa_put(hiscore->ifa);
072047e4 1241 return 0;
1da177e4 1242}
5e5f3f0f 1243EXPORT_SYMBOL(ipv6_dev_get_saddr);
1da177e4 1244
95c385b4
NH		 1245int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1246 unsigned char banned_flags)
1da177e4
LT		 1247{
1248 struct inet6_dev *idev;
1249 int err = -EADDRNOTAVAIL;
1250
8814c4b5 1251 rcu_read_lock();
e21e8467
SH		 1252 idev = __in6_dev_get(dev);
1253 if (idev) {
1da177e4
LT		 1254 struct inet6_ifaddr *ifp;
1255
1256 read_lock_bh(&idev->lock);
502a2ffd 1257 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1258 if (ifp->scope == IFA_LINK &&
1259 !(ifp->flags & banned_flags)) {
1da177e4
LT		 1260 ipv6_addr_copy(addr, &ifp->addr);
1261 err = 0;
1262 break;
1263 }
1264 }
1265 read_unlock_bh(&idev->lock);
1266 }
8814c4b5 1267 rcu_read_unlock();
1da177e4
LT		 1268 return err;
1269}
1270
1271static int ipv6_count_addresses(struct inet6_dev *idev)
1272{
1273 int cnt = 0;
1274 struct inet6_ifaddr *ifp;
1275
1276 read_lock_bh(&idev->lock);
502a2ffd 1277 list_for_each_entry(ifp, &idev->addr_list, if_list)
1da177e4
LT		 1278 cnt++;
1279 read_unlock_bh(&idev->lock);
1280 return cnt;
1281}
1282
bfeade08
DL		 1283int ipv6_chk_addr(struct net *net, struct in6_addr *addr,
1284 struct net_device *dev, int strict)
1da177e4 1285{
eedf042a 1286 struct inet6_ifaddr *ifp;
c2e21293 1287 struct hlist_node *node;
3a88a81d 1288 unsigned int hash = ipv6_addr_hash(addr);
1da177e4 1289
5c578aed 1290 rcu_read_lock_bh();
1291 hlist_for_each_entry_rcu(ifp, node, &inet6_addr_lst[hash], addr_lst) {
878628fb 1292 if (!net_eq(dev_net(ifp->idev->dev), net))
bfeade08 1293 continue;
1da177e4 1294 if (ipv6_addr_equal(&ifp->addr, addr) &&
eedf042a
SH		 1295 !(ifp->flags&IFA_F_TENTATIVE) &&
1296 (dev == NULL || ifp->idev->dev == dev ||
1297 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) {
1298 rcu_read_unlock_bh();
1299 return 1;
1da177e4
LT		 1300 }
1301 }
5c578aed 1302
eedf042a
SH		 1303 rcu_read_unlock_bh();
1304 return 0;
1da177e4 1305}
7159039a
YH		 1306EXPORT_SYMBOL(ipv6_chk_addr);
1307
3e81c6da
DM		 1308static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1309 struct net_device *dev)
1da177e4 1310{
3e81c6da 1311 unsigned int hash = ipv6_addr_hash(addr);
c2e21293 1312 struct inet6_ifaddr *ifp;
1313 struct hlist_node *node;
1da177e4 1314
c2e21293 1315 hlist_for_each_entry(ifp, node, &inet6_addr_lst[hash], addr_lst) {
878628fb 1316 if (!net_eq(dev_net(ifp->idev->dev), net))
06bfe655 1317 continue;
1da177e4
LT		 1318 if (ipv6_addr_equal(&ifp->addr, addr)) {
1319 if (dev == NULL || ifp->idev->dev == dev)
3e81c6da 1320 return true;
1da177e4
LT		 1321 }
1322 }
3e81c6da 1323 return false;
1da177e4
LT		 1324}
1325
52eeeb84
YH		 1326int ipv6_chk_prefix(struct in6_addr *addr, struct net_device *dev)
1327{
1328 struct inet6_dev *idev;
1329 struct inet6_ifaddr *ifa;
1330 int onlink;
1331
1332 onlink = 0;
1333 rcu_read_lock();
1334 idev = __in6_dev_get(dev);
1335 if (idev) {
1336 read_lock_bh(&idev->lock);
502a2ffd 1337 list_for_each_entry(ifa, &idev->addr_list, if_list) {
52eeeb84
YH		 1338 onlink = ipv6_prefix_equal(addr, &ifa->addr,
1339 ifa->prefix_len);
1340 if (onlink)
1341 break;
1342 }
1343 read_unlock_bh(&idev->lock);
1344 }
1345 rcu_read_unlock();
1346 return onlink;
1347}
1348
1349EXPORT_SYMBOL(ipv6_chk_prefix);
1350
9acd9f3a 1351struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1cab3da6 1352 struct net_device *dev, int strict)
1da177e4 1353{
b79d1d54 1354 struct inet6_ifaddr *ifp, *result = NULL;
3a88a81d 1355 unsigned int hash = ipv6_addr_hash(addr);
b79d1d54 1356 struct hlist_node *node;
1da177e4 1357
5c578aed 1358 rcu_read_lock_bh();
4f70ecca 1359 hlist_for_each_entry_rcu_bh(ifp, node, &inet6_addr_lst[hash], addr_lst) {
878628fb 1360 if (!net_eq(dev_net(ifp->idev->dev), net))
1cab3da6 1361 continue;
1da177e4
LT		 1362 if (ipv6_addr_equal(&ifp->addr, addr)) {
1363 if (dev == NULL || ifp->idev->dev == dev ||
1364 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
b79d1d54 1365 result = ifp;
1da177e4
LT		 1366 in6_ifa_hold(ifp);
1367 break;
1368 }
1369 }
1370 }
5c578aed 1371 rcu_read_unlock_bh();
1da177e4 1372
b79d1d54 1373 return result;
1da177e4
LT		 1374}
1375
1da177e4
LT		 1376/* Gets referenced address, destroys ifaddr */
1377
cc411d0b 1378static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
1da177e4 1379{
1da177e4
LT		 1380 if (ifp->flags&IFA_F_PERMANENT) {
1381 spin_lock_bh(&ifp->lock);
1382 addrconf_del_timer(ifp);
1383 ifp->flags |= IFA_F_TENTATIVE;
cc411d0b
BH		 1384 if (dad_failed)
1385 ifp->flags |= IFA_F_DADFAILED;
1da177e4 1386 spin_unlock_bh(&ifp->lock);
e2577a06
HX		 1387 if (dad_failed)
1388 ipv6_ifa_notify(0, ifp);
1da177e4
LT		 1389 in6_ifa_put(ifp);
1390#ifdef CONFIG_IPV6_PRIVACY
1391 } else if (ifp->flags&IFA_F_TEMPORARY) {
1392 struct inet6_ifaddr *ifpub;
1393 spin_lock_bh(&ifp->lock);
1394 ifpub = ifp->ifpub;
1395 if (ifpub) {
1396 in6_ifa_hold(ifpub);
1397 spin_unlock_bh(&ifp->lock);
1398 ipv6_create_tempaddr(ifpub, ifp);
1399 in6_ifa_put(ifpub);
1400 } else {
1401 spin_unlock_bh(&ifp->lock);
1402 }
1403 ipv6_del_addr(ifp);
1404#endif
1405 } else
1406 ipv6_del_addr(ifp);
1407}
1408
3c21edbd
YH		 1409void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1410{
1b34be74 1411 struct inet6_dev *idev = ifp->idev;
9bdd8d40
BH		 1412
1413 if (net_ratelimit())
0522fea6
JR		 1414 printk(KERN_INFO "%s: IPv6 duplicate address %pI6c detected!\n",
1415 ifp->idev->dev->name, &ifp->addr);
9bdd8d40 1416
1b34be74
YH		 1417 if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6) {
1418 struct in6_addr addr;
1419
1420 addr.s6_addr32[0] = htonl(0xfe800000);
1421 addr.s6_addr32[1] = 0;
1422
1423 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
1424 ipv6_addr_equal(&ifp->addr, &addr)) {
1425 /* DAD failed for link-local based on MAC address */
1426 idev->cnf.disable_ipv6 = 1;
9bdd8d40
BH		 1427
1428 printk(KERN_INFO "%s: IPv6 being disabled!\n",
1429 ifp->idev->dev->name);
1b34be74
YH		 1430 }
1431 }
1432
cc411d0b 1433 addrconf_dad_stop(ifp, 1);
3c21edbd 1434}
1da177e4
LT		 1435
1436/* Join to solicited addr multicast group. */
1437
1438void addrconf_join_solict(struct net_device *dev, struct in6_addr *addr)
1439{
1440 struct in6_addr maddr;
1441
1442 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1443 return;
1444
1445 addrconf_addr_solict_mult(addr, &maddr);
1446 ipv6_dev_mc_inc(dev, &maddr);
1447}
1448
1449void addrconf_leave_solict(struct inet6_dev *idev, struct in6_addr *addr)
1450{
1451 struct in6_addr maddr;
1452
1453 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1454 return;
1455
1456 addrconf_addr_solict_mult(addr, &maddr);
1457 __ipv6_dev_mc_dec(idev, &maddr);
1458}
1459
20380731 1460static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1da177e4
LT		 1461{
1462 struct in6_addr addr;
1463 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1464 if (ipv6_addr_any(&addr))
1465 return;
1466 ipv6_dev_ac_inc(ifp->idev->dev, &addr);
1467}
1468
20380731 1469static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1da177e4
LT		 1470{
1471 struct in6_addr addr;
1472 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1473 if (ipv6_addr_any(&addr))
1474 return;
1475 __ipv6_dev_ac_dec(ifp->idev, &addr);
1476}
1477
073a8e0e
YH		 1478static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
1479{
1480 if (dev->addr_len != ETH_ALEN)
1481 return -1;
1482 memcpy(eui, dev->dev_addr, 3);
1483 memcpy(eui + 5, dev->dev_addr + 3, 3);
1484
1485 /*
1486 * The zSeries OSA network cards can be shared among various
1487 * OS instances, but the OSA cards have only one MAC address.
1488 * This leads to duplicate address conflicts in conjunction
1489 * with IPv6 if more than one instance uses the same card.
1490 *
1491 * The driver for these cards can deliver a unique 16-bit
1492 * identifier for each instance sharing the same card. It is
1493 * placed instead of 0xFFFE in the interface identifier. The
1494 * "u" bit of the interface identifier is not inverted in this
1495 * case. Hence the resulting interface identifier has local
1496 * scope according to RFC2373.
1497 */
1498 if (dev->dev_id) {
1499 eui[3] = (dev->dev_id >> 8) & 0xFF;
1500 eui[4] = dev->dev_id & 0xFF;
1501 } else {
1502 eui[3] = 0xFF;
1503 eui[4] = 0xFE;
1504 eui[0] ^= 2;
1505 }
1506 return 0;
1507}
1508
1509static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1510{
1511 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1512 if (dev->addr_len != ARCNET_ALEN)
1513 return -1;
1514 memset(eui, 0, 7);
1515 eui[7] = *(u8*)dev->dev_addr;
1516 return 0;
1517}
1518
1519static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1520{
1521 if (dev->addr_len != INFINIBAND_ALEN)
1522 return -1;
1523 memcpy(eui, dev->dev_addr + 12, 8);
1524 eui[0] |= 2;
1525 return 0;
1526}
1527
dfd982ba
YH		 1528int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
1529{
9af28511
SH		 1530 if (addr == 0)
1531 return -1;
dfd982ba
YH		 1532 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
1533 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
1534 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
1535 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
1536 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
1537 ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
1538 eui[1] = 0;
1539 eui[2] = 0x5E;
1540 eui[3] = 0xFE;
1541 memcpy(eui + 4, &addr, 4);
1542 return 0;
1543}
1544EXPORT_SYMBOL(__ipv6_isatap_ifid);
1545
1546static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
1547{
1548 if (dev->priv_flags & IFF_ISATAP)
1549 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1550 return -1;
1551}
1552
1da177e4
LT		 1553static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1554{
1555 switch (dev->type) {
1556 case ARPHRD_ETHER:
1557 case ARPHRD_FDDI:
1558 case ARPHRD_IEEE802_TR:
073a8e0e 1559 return addrconf_ifid_eui48(eui, dev);
1da177e4 1560 case ARPHRD_ARCNET:
073a8e0e 1561 return addrconf_ifid_arcnet(eui, dev);
1da177e4 1562 case ARPHRD_INFINIBAND:
073a8e0e 1563 return addrconf_ifid_infiniband(eui, dev);
c7dc89c0 1564 case ARPHRD_SIT:
dfd982ba 1565 return addrconf_ifid_sit(eui, dev);
1da177e4
LT		 1566 }
1567 return -1;
1568}
1569
1570static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1571{
1572 int err = -1;
1573 struct inet6_ifaddr *ifp;
1574
1575 read_lock_bh(&idev->lock);
502a2ffd 1576 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1da177e4
LT		 1577 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1578 memcpy(eui, ifp->addr.s6_addr+8, 8);
1579 err = 0;
1580 break;
1581 }
1582 }
1583 read_unlock_bh(&idev->lock);
1584 return err;
1585}
1586
1587#ifdef CONFIG_IPV6_PRIVACY
1588/* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
1589static int __ipv6_regen_rndid(struct inet6_dev *idev)
1590{
1da177e4 1591regen:
955189ef 1592 get_random_bytes(idev->rndid, sizeof(idev->rndid));
1da177e4 1593 idev->rndid[0] &= ~0x02;
1da177e4
LT		 1594
1595 /*
1596 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1597 * check if generated address is not inappropriate
1598 *
1599 * - Reserved subnet anycast (RFC 2526)
1600 * 11111101 11....11 1xxxxxxx
c7dc89c0 1601 * - ISATAP (RFC4214) 6.1
1da177e4
LT		 1602 * 00-00-5E-FE-xx-xx-xx-xx
1603 * - value 0
1604 * - XXX: already assigned to an address on the device
1605 */
1ab1457c 1606 if (idev->rndid[0] == 0xfd &&
1da177e4
LT		 1607 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1608 (idev->rndid[7]&0x80))
1609 goto regen;
1610 if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1611 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1612 goto regen;
1613 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1614 goto regen;
1615 }
1616
1617 return 0;
1618}
1619
1620static void ipv6_regen_rndid(unsigned long data)
1621{
1622 struct inet6_dev *idev = (struct inet6_dev *) data;
1623 unsigned long expires;
1624
8814c4b5 1625 rcu_read_lock_bh();
1da177e4
LT		 1626 write_lock_bh(&idev->lock);
1627
1628 if (idev->dead)
1629 goto out;
1630
1631 if (__ipv6_regen_rndid(idev) < 0)
1632 goto out;
1ab1457c 1633
1da177e4 1634 expires = jiffies +
1ab1457c 1635 idev->cnf.temp_prefered_lft * HZ -
1da177e4
LT		 1636 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time - desync_factor;
1637 if (time_before(expires, jiffies)) {
1638 printk(KERN_WARNING
1639 "ipv6_regen_rndid(): too short regeneration interval; timer disabled for %s.\n",
1640 idev->dev->name);
1641 goto out;
1642 }
1643
1644 if (!mod_timer(&idev->regen_timer, expires))
1645 in6_dev_hold(idev);
1646
1647out:
1648 write_unlock_bh(&idev->lock);
8814c4b5 1649 rcu_read_unlock_bh();
1da177e4
LT		 1650 in6_dev_put(idev);
1651}
1652
1653static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) {
1654 int ret = 0;
1655
1656 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
1657 ret = __ipv6_regen_rndid(idev);
1658 return ret;
1659}
1660#endif
1661
1662/*
1663 * Add prefix route.
1664 */
1665
1666static void
1667addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
e431b8c0 1668 unsigned long expires, u32 flags)
1da177e4 1669{
86872cb5
TG		 1670 struct fib6_config cfg = {
1671 .fc_table = RT6_TABLE_PREFIX,
1672 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1673 .fc_ifindex = dev->ifindex,
1674 .fc_expires = expires,
1675 .fc_dst_len = plen,
1676 .fc_flags = RTF_UP | flags,
c346dca1 1677 .fc_nlinfo.nl_net = dev_net(dev),
f410a1fb 1678 .fc_protocol = RTPROT_KERNEL,
86872cb5 1679 };
1da177e4 1680
86872cb5 1681 ipv6_addr_copy(&cfg.fc_dst, pfx);
1da177e4
LT		 1682
1683 /* Prevent useless cloning on PtP SIT.
1684 This thing is done here expecting that the whole
1685 class of non-broadcast devices need not cloning.
1686 */
0be669bb 1687#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
86872cb5
TG		 1688 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
1689 cfg.fc_flags |= RTF_NONEXTHOP;
0be669bb 1690#endif
1da177e4 1691
86872cb5 1692 ip6_route_add(&cfg);
1da177e4
LT		 1693}
1694
1695/* Create "default" multicast route to the interface */
1696
1697static void addrconf_add_mroute(struct net_device *dev)
1698{
86872cb5
TG		 1699 struct fib6_config cfg = {
1700 .fc_table = RT6_TABLE_LOCAL,
1701 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1702 .fc_ifindex = dev->ifindex,
1703 .fc_dst_len = 8,
1704 .fc_flags = RTF_UP,
c346dca1 1705 .fc_nlinfo.nl_net = dev_net(dev),
86872cb5
TG		 1706 };
1707
1708 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
1709
1710 ip6_route_add(&cfg);
1da177e4
LT		 1711}
1712
0be669bb 1713#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1da177e4
LT		 1714static void sit_route_add(struct net_device *dev)
1715{
86872cb5
TG		 1716 struct fib6_config cfg = {
1717 .fc_table = RT6_TABLE_MAIN,
1718 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1719 .fc_ifindex = dev->ifindex,
1720 .fc_dst_len = 96,
1721 .fc_flags = RTF_UP | RTF_NONEXTHOP,
c346dca1 1722 .fc_nlinfo.nl_net = dev_net(dev),
86872cb5 1723 };
1da177e4
LT		 1724
1725 /* prefix length - 96 bits "::d.d.d.d" */
86872cb5 1726 ip6_route_add(&cfg);
1da177e4 1727}
0be669bb 1728#endif
1da177e4
LT		 1729
1730static void addrconf_add_lroute(struct net_device *dev)
1731{
1732 struct in6_addr addr;
1733
1734 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
1735 addrconf_prefix_route(&addr, 64, dev, 0, 0);
1736}
1737
1738static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
1739{
1740 struct inet6_dev *idev;
1741
1742 ASSERT_RTNL();
1743
e21e8467
SH		 1744 idev = ipv6_find_idev(dev);
1745 if (!idev)
1da177e4
LT		 1746 return NULL;
1747
1748 /* Add default multicast route */
1749 addrconf_add_mroute(dev);
1750
1751 /* Add link local route */
1752 addrconf_add_lroute(dev);
1753 return idev;
1754}
1755
1756void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len)
1757{
1758 struct prefix_info *pinfo;
1759 __u32 valid_lft;
1760 __u32 prefered_lft;
1761 int addr_type;
1da177e4 1762 struct inet6_dev *in6_dev;
56d417b1 1763 struct net *net = dev_net(dev);
1da177e4
LT		 1764
1765 pinfo = (struct prefix_info *) opt;
1ab1457c 1766
1da177e4
LT		 1767 if (len < sizeof(struct prefix_info)) {
1768 ADBG(("addrconf: prefix option too short\n"));
1769 return;
1770 }
1ab1457c 1771
1da177e4
LT		 1772 /*
1773 * Validation checks ([ADDRCONF], page 19)
1774 */
1775
1776 addr_type = ipv6_addr_type(&pinfo->prefix);
1777
1778 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
1779 return;
1780
1781 valid_lft = ntohl(pinfo->valid);
1782 prefered_lft = ntohl(pinfo->prefered);
1783
1784 if (prefered_lft > valid_lft) {
1785 if (net_ratelimit())
1786 printk(KERN_WARNING "addrconf: prefix option has invalid lifetime\n");
1787 return;
1788 }
1789
1790 in6_dev = in6_dev_get(dev);
1791
1792 if (in6_dev == NULL) {
1793 if (net_ratelimit())
1794 printk(KERN_DEBUG "addrconf: device %s not configured\n", dev->name);
1795 return;
1796 }
1797
1798 /*
1799 * Two things going on here:
1800 * 1) Add routes for on-link prefixes
1801 * 2) Configure prefixes with the auto flag set
1802 */
1803
4bed72e4
YH		 1804 if (pinfo->onlink) {
1805 struct rt6_info *rt;
1806 unsigned long rt_expires;
1807
6f704992
YH		 1808 /* Avoid arithmetic overflow. Really, we could
1809 * save rt_expires in seconds, likely valid_lft,
1810 * but it would require division in fib gc, that it
1811 * not good.
1812 */
4bed72e4
YH		 1813 if (HZ > USER_HZ)
1814 rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
1815 else
1816 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
3dd4bc68 1817
4bed72e4
YH		 1818 if (addrconf_finite_timeout(rt_expires))
1819 rt_expires *= HZ;
1da177e4 1820
56d417b1 1821 rt = rt6_lookup(net, &pinfo->prefix, NULL,
6fda7350 1822 dev->ifindex, 1);
1da177e4 1823
2b5ead46 1824 if (rt && addrconf_is_prefix_route(rt)) {
6f704992
YH		 1825 /* Autoconf prefix route */
1826 if (valid_lft == 0) {
1827 ip6_del_rt(rt);
1828 rt = NULL;
4bed72e4 1829 } else if (addrconf_finite_timeout(rt_expires)) {
6f704992
YH		 1830 /* not infinity */
1831 rt->rt6i_expires = jiffies + rt_expires;
1832 rt->rt6i_flags |= RTF_EXPIRES;
1833 } else {
1834 rt->rt6i_flags &= ~RTF_EXPIRES;
1835 rt->rt6i_expires = 0;
1da177e4
LT		 1836 }
1837 } else if (valid_lft) {
6f704992 1838 clock_t expires = 0;
4bed72e4
YH		 1839 int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
1840 if (addrconf_finite_timeout(rt_expires)) {
6f704992
YH		 1841 /* not infinity */
1842 flags |= RTF_EXPIRES;
1843 expires = jiffies_to_clock_t(rt_expires);
1844 }
1da177e4 1845 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
6f704992 1846 dev, expires, flags);
1da177e4
LT		 1847 }
1848 if (rt)
1849 dst_release(&rt->u.dst);
1850 }
1851
1852 /* Try to figure out our local address for this prefix */
1853
1854 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
1855 struct inet6_ifaddr * ifp;
1856 struct in6_addr addr;
1857 int create = 0, update_lft = 0;
1858
1859 if (pinfo->prefix_len == 64) {
1860 memcpy(&addr, &pinfo->prefix, 8);
1861 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
1862 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
1863 in6_dev_put(in6_dev);
1864 return;
1865 }
1866 goto ok;
1867 }
1868 if (net_ratelimit())
1869 printk(KERN_DEBUG "IPv6 addrconf: prefix with wrong length %d\n",
1870 pinfo->prefix_len);
1871 in6_dev_put(in6_dev);
1872 return;
1873
1874ok:
1875
53b7997f 1876 ifp = ipv6_get_ifaddr(net, &addr, dev, 1);
1da177e4
LT		 1877
1878 if (ifp == NULL && valid_lft) {
1879 int max_addresses = in6_dev->cnf.max_addresses;
95c385b4
NH		 1880 u32 addr_flags = 0;
1881
1882#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1883 if (in6_dev->cnf.optimistic_dad &&
53b7997f 1884 !net->ipv6.devconf_all->forwarding)
95c385b4
NH		 1885 addr_flags = IFA_F_OPTIMISTIC;
1886#endif
1da177e4
LT		 1887
1888 /* Do not allow to create too much of autoconfigured
1889 * addresses; this would be too easy way to crash kernel.
1890 */
1891 if (!max_addresses ||
1892 ipv6_count_addresses(in6_dev) < max_addresses)
1893 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len,
95c385b4
NH		 1894 addr_type&IPV6_ADDR_SCOPE_MASK,
1895 addr_flags);
1da177e4
LT		 1896
1897 if (!ifp || IS_ERR(ifp)) {
1898 in6_dev_put(in6_dev);
1899 return;
1900 }
1901
1902 update_lft = create = 1;
1903 ifp->cstamp = jiffies;
1904 addrconf_dad_start(ifp, RTF_ADDRCONF|RTF_PREFIX_RT);
1905 }
1906
1907 if (ifp) {
1908 int flags;
1909 unsigned long now;
1910#ifdef CONFIG_IPV6_PRIVACY
1911 struct inet6_ifaddr *ift;
1912#endif
1913 u32 stored_lft;
1914
1915 /* update lifetime (RFC2462 5.5.3 e) */
1916 spin_lock(&ifp->lock);
1917 now = jiffies;
1918 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
1919 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
1920 else
1921 stored_lft = 0;
1922 if (!update_lft && stored_lft) {
1923 if (valid_lft > MIN_VALID_LIFETIME ||
1924 valid_lft > stored_lft)
1925 update_lft = 1;
1926 else if (stored_lft <= MIN_VALID_LIFETIME) {
1927 /* valid_lft <= stored_lft is always true */
a1ed0526
BH		 1928 /*
1929 * RFC 4862 Section 5.5.3e:
1930 * "Note that the preferred lifetime of
1931 * the corresponding address is always
1932 * reset to the Preferred Lifetime in
1933 * the received Prefix Information
1934 * option, regardless of whether the
1935 * valid lifetime is also reset or
1936 * ignored."
1937 *
1938 * So if the preferred lifetime in
1939 * this advertisement is different
1940 * than what we have stored, but the
1941 * valid lifetime is invalid, just
1942 * reset prefered_lft.
1943 *
1944 * We must set the valid lifetime
1945 * to the stored lifetime since we'll
1946 * be updating the timestamp below,
1947 * else we'll set it back to the
1948 * minumum.
1949 */
1950 if (prefered_lft != ifp->prefered_lft) {
1951 valid_lft = stored_lft;
1952 update_lft = 1;
1953 }
1da177e4
LT		 1954 } else {
1955 valid_lft = MIN_VALID_LIFETIME;
1956 if (valid_lft < prefered_lft)
1957 prefered_lft = valid_lft;
1958 update_lft = 1;
1959 }
1960 }
1961
1962 if (update_lft) {
1963 ifp->valid_lft = valid_lft;
1964 ifp->prefered_lft = prefered_lft;
1965 ifp->tstamp = now;
1966 flags = ifp->flags;
1967 ifp->flags &= ~IFA_F_DEPRECATED;
1968 spin_unlock(&ifp->lock);
1969
1970 if (!(flags&IFA_F_TENTATIVE))
1971 ipv6_ifa_notify(0, ifp);
1972 } else
1973 spin_unlock(&ifp->lock);
1974
1975#ifdef CONFIG_IPV6_PRIVACY
1976 read_lock_bh(&in6_dev->lock);
1977 /* update all temporary addresses in the list */
372e6c8f 1978 list_for_each_entry(ift, &in6_dev->tempaddr_list, tmp_list) {
1da177e4
LT		 1979 /*
1980 * When adjusting the lifetimes of an existing
1981 * temporary address, only lower the lifetimes.
1982 * Implementations must not increase the
1983 * lifetimes of an existing temporary address
1984 * when processing a Prefix Information Option.
1985 */
c6fbfac2
BB		 1986 if (ifp != ift->ifpub)
1987 continue;
1988
1da177e4
LT		 1989 spin_lock(&ift->lock);
1990 flags = ift->flags;
1991 if (ift->valid_lft > valid_lft &&
1992 ift->valid_lft - valid_lft > (jiffies - ift->tstamp) / HZ)
1993 ift->valid_lft = valid_lft + (jiffies - ift->tstamp) / HZ;
1994 if (ift->prefered_lft > prefered_lft &&
1995 ift->prefered_lft - prefered_lft > (jiffies - ift->tstamp) / HZ)
1996 ift->prefered_lft = prefered_lft + (jiffies - ift->tstamp) / HZ;
1997 spin_unlock(&ift->lock);
1998 if (!(flags&IFA_F_TENTATIVE))
1999 ipv6_ifa_notify(0, ift);
2000 }
2001
2002 if (create && in6_dev->cnf.use_tempaddr > 0) {
2003 /*
2004 * When a new public address is created as described in [ADDRCONF],
2005 * also create a new temporary address.
2006 */
1ab1457c 2007 read_unlock_bh(&in6_dev->lock);
1da177e4
LT		 2008 ipv6_create_tempaddr(ifp, NULL);
2009 } else {
2010 read_unlock_bh(&in6_dev->lock);
2011 }
2012#endif
2013 in6_ifa_put(ifp);
2014 addrconf_verify(0);
2015 }
2016 }
2017 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
2018 in6_dev_put(in6_dev);
2019}
2020
2021/*
2022 * Set destination address.
2023 * Special case for SIT interfaces where we create a new "virtual"
2024 * device.
2025 */
af284937 2026int addrconf_set_dstaddr(struct net *net, void __user *arg)
1da177e4
LT		 2027{
2028 struct in6_ifreq ireq;
2029 struct net_device *dev;
2030 int err = -EINVAL;
2031
2032 rtnl_lock();
2033
2034 err = -EFAULT;
2035 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2036 goto err_exit;
2037
af284937 2038 dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
1da177e4
LT		 2039
2040 err = -ENODEV;
2041 if (dev == NULL)
2042 goto err_exit;
2043
0be669bb 2044#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1da177e4 2045 if (dev->type == ARPHRD_SIT) {
5bc3eb7e 2046 const struct net_device_ops *ops = dev->netdev_ops;
1da177e4 2047 struct ifreq ifr;
1da177e4
LT		 2048 struct ip_tunnel_parm p;
2049
2050 err = -EADDRNOTAVAIL;
2051 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2052 goto err_exit;
2053
2054 memset(&p, 0, sizeof(p));
2055 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2056 p.iph.saddr = 0;
2057 p.iph.version = 4;
2058 p.iph.ihl = 5;
2059 p.iph.protocol = IPPROTO_IPV6;
2060 p.iph.ttl = 64;
d20b3109 2061 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
1da177e4 2062
5bc3eb7e
SH		 2063 if (ops->ndo_do_ioctl) {
2064 mm_segment_t oldfs = get_fs();
2065
2066 set_fs(KERNEL_DS);
2067 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2068 set_fs(oldfs);
2069 } else
2070 err = -EOPNOTSUPP;
1da177e4
LT		 2071
2072 if (err == 0) {
2073 err = -ENOBUFS;
af284937
DL		 2074 dev = __dev_get_by_name(net, p.name);
2075 if (!dev)
1da177e4
LT		 2076 goto err_exit;
2077 err = dev_open(dev);
2078 }
2079 }
0be669bb 2080#endif
1da177e4
LT		 2081
2082err_exit:
2083 rtnl_unlock();
2084 return err;
2085}
2086
2087/*
2088 * Manual configuration of address on an interface
2089 */
af284937 2090static int inet6_addr_add(struct net *net, int ifindex, struct in6_addr *pfx,
24ef0da7 2091 unsigned int plen, __u8 ifa_flags, __u32 prefered_lft,
af284937 2092 __u32 valid_lft)
1da177e4
LT		 2093{
2094 struct inet6_ifaddr *ifp;
2095 struct inet6_dev *idev;
2096 struct net_device *dev;
2097 int scope;
6f704992
YH		 2098 u32 flags;
2099 clock_t expires;
4bed72e4 2100 unsigned long timeout;
1da177e4
LT		 2101
2102 ASSERT_RTNL();
1ab1457c 2103
24ef0da7
TG		 2104 if (plen > 128)
2105 return -EINVAL;
2106
0778769d
NT		 2107 /* check the lifetime */
2108 if (!valid_lft || prefered_lft > valid_lft)
2109 return -EINVAL;
2110
af284937
DL		 2111 dev = __dev_get_by_index(net, ifindex);
2112 if (!dev)
1da177e4 2113 return -ENODEV;
1ab1457c 2114
1da177e4
LT		 2115 if ((idev = addrconf_add_dev(dev)) == NULL)
2116 return -ENOBUFS;
2117
2118 scope = ipv6_addr_scope(pfx);
2119
4bed72e4
YH		 2120 timeout = addrconf_timeout_fixup(valid_lft, HZ);
2121 if (addrconf_finite_timeout(timeout)) {
2122 expires = jiffies_to_clock_t(timeout * HZ);
2123 valid_lft = timeout;
6f704992 2124 flags = RTF_EXPIRES;
4bed72e4
YH		 2125 } else {
2126 expires = 0;
2127 flags = 0;
2128 ifa_flags |= IFA_F_PERMANENT;
6f704992 2129 }
0778769d 2130
4bed72e4
YH		 2131 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
2132 if (addrconf_finite_timeout(timeout)) {
2133 if (timeout == 0)
2134 ifa_flags |= IFA_F_DEPRECATED;
2135 prefered_lft = timeout;
2136 }
0778769d
NT		 2137
2138 ifp = ipv6_add_addr(idev, pfx, plen, scope, ifa_flags);
2139
1da177e4 2140 if (!IS_ERR(ifp)) {
06aebfb7 2141 spin_lock_bh(&ifp->lock);
0778769d
NT		 2142 ifp->valid_lft = valid_lft;
2143 ifp->prefered_lft = prefered_lft;
2144 ifp->tstamp = jiffies;
06aebfb7 2145 spin_unlock_bh(&ifp->lock);
0778769d 2146
46d48046 2147 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
6f704992 2148 expires, flags);
95c385b4
NH		 2149 /*
2150 * Note that section 3.1 of RFC 4429 indicates
2151 * that the Optimistic flag should not be set for
2152 * manually configured addresses
2153 */
1da177e4
LT		 2154 addrconf_dad_start(ifp, 0);
2155 in6_ifa_put(ifp);
0778769d 2156 addrconf_verify(0);
1da177e4
LT		 2157 return 0;
2158 }
2159
2160 return PTR_ERR(ifp);
2161}
2162
af284937 2163static int inet6_addr_del(struct net *net, int ifindex, struct in6_addr *pfx,
24ef0da7 2164 unsigned int plen)
1da177e4
LT		 2165{
2166 struct inet6_ifaddr *ifp;
2167 struct inet6_dev *idev;
2168 struct net_device *dev;
1ab1457c 2169
24ef0da7
TG		 2170 if (plen > 128)
2171 return -EINVAL;
2172
af284937
DL		 2173 dev = __dev_get_by_index(net, ifindex);
2174 if (!dev)
1da177e4
LT		 2175 return -ENODEV;
2176
2177 if ((idev = __in6_dev_get(dev)) == NULL)
2178 return -ENXIO;
2179
2180 read_lock_bh(&idev->lock);
502a2ffd 2181 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1da177e4
LT		 2182 if (ifp->prefix_len == plen &&
2183 ipv6_addr_equal(pfx, &ifp->addr)) {
2184 in6_ifa_hold(ifp);
2185 read_unlock_bh(&idev->lock);
1ab1457c 2186
1da177e4
LT		 2187 ipv6_del_addr(ifp);
2188
2189 /* If the last address is deleted administratively,
2190 disable IPv6 on this interface.
2191 */
502a2ffd 2192 if (list_empty(&idev->addr_list))
1da177e4
LT		 2193 addrconf_ifdown(idev->dev, 1);
2194 return 0;
2195 }
2196 }
2197 read_unlock_bh(&idev->lock);
2198 return -EADDRNOTAVAIL;
2199}
2200
2201
af284937 2202int addrconf_add_ifaddr(struct net *net, void __user *arg)
1da177e4
LT		 2203{
2204 struct in6_ifreq ireq;
2205 int err;
1ab1457c 2206
1da177e4
LT		 2207 if (!capable(CAP_NET_ADMIN))
2208 return -EPERM;
1ab1457c 2209
1da177e4
LT		 2210 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2211 return -EFAULT;
2212
2213 rtnl_lock();
af284937
DL		 2214 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2215 ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2216 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
1da177e4
LT		 2217 rtnl_unlock();
2218 return err;
2219}
2220
af284937 2221int addrconf_del_ifaddr(struct net *net, void __user *arg)
1da177e4
LT		 2222{
2223 struct in6_ifreq ireq;
2224 int err;
1ab1457c 2225
1da177e4
LT		 2226 if (!capable(CAP_NET_ADMIN))
2227 return -EPERM;
2228
2229 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2230 return -EFAULT;
2231
2232 rtnl_lock();
af284937
DL		 2233 err = inet6_addr_del(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2234 ireq.ifr6_prefixlen);
1da177e4
LT		 2235 rtnl_unlock();
2236 return err;
2237}
2238
b5f348e5
IJ		 2239static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
2240 int plen, int scope)
2241{
2242 struct inet6_ifaddr *ifp;
2243
2244 ifp = ipv6_add_addr(idev, addr, plen, scope, IFA_F_PERMANENT);
2245 if (!IS_ERR(ifp)) {
2246 spin_lock_bh(&ifp->lock);
2247 ifp->flags &= ~IFA_F_TENTATIVE;
2248 spin_unlock_bh(&ifp->lock);
2249 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2250 in6_ifa_put(ifp);
2251 }
2252}
2253
0be669bb 2254#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1da177e4
LT		 2255static void sit_add_v4_addrs(struct inet6_dev *idev)
2256{
1da177e4
LT		 2257 struct in6_addr addr;
2258 struct net_device *dev;
c346dca1 2259 struct net *net = dev_net(idev->dev);
1da177e4
LT		 2260 int scope;
2261
2262 ASSERT_RTNL();
2263
2264 memset(&addr, 0, sizeof(struct in6_addr));
2265 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2266
2267 if (idev->dev->flags&IFF_POINTOPOINT) {
2268 addr.s6_addr32[0] = htonl(0xfe800000);
2269 scope = IFA_LINK;
2270 } else {
2271 scope = IPV6_ADDR_COMPATv4;
2272 }
2273
2274 if (addr.s6_addr32[3]) {
b5f348e5 2275 add_addr(idev, &addr, 128, scope);
1da177e4
LT		 2276 return;
2277 }
2278
6fda7350 2279 for_each_netdev(net, dev) {
e5ed6399 2280 struct in_device * in_dev = __in_dev_get_rtnl(dev);
1da177e4
LT		 2281 if (in_dev && (dev->flags & IFF_UP)) {
2282 struct in_ifaddr * ifa;
2283
2284 int flag = scope;
2285
2286 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2287 int plen;
2288
2289 addr.s6_addr32[3] = ifa->ifa_local;
2290
2291 if (ifa->ifa_scope == RT_SCOPE_LINK)
2292 continue;
2293 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2294 if (idev->dev->flags&IFF_POINTOPOINT)
2295 continue;
2296 flag |= IFA_HOST;
2297 }
2298 if (idev->dev->flags&IFF_POINTOPOINT)
2299 plen = 64;
2300 else
2301 plen = 96;
2302
b5f348e5 2303 add_addr(idev, &addr, plen, flag);
1da177e4
LT		 2304 }
2305 }
1ab1457c 2306 }
1da177e4 2307}
0be669bb 2308#endif
1da177e4
LT		 2309
2310static void init_loopback(struct net_device *dev)
2311{
2312 struct inet6_dev *idev;
1da177e4
LT		 2313
2314 /* ::1 */
2315
2316 ASSERT_RTNL();
2317
2318 if ((idev = ipv6_find_idev(dev)) == NULL) {
2319 printk(KERN_DEBUG "init loopback: add_dev failed\n");
2320 return;
2321 }
2322
b5f348e5 2323 add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
1da177e4
LT		 2324}
2325
2326static void addrconf_add_linklocal(struct inet6_dev *idev, struct in6_addr *addr)
2327{
2328 struct inet6_ifaddr * ifp;
95c385b4
NH		 2329 u32 addr_flags = IFA_F_PERMANENT;
2330
2331#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2332 if (idev->cnf.optimistic_dad &&
702beb87 2333 !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
95c385b4
NH		 2334 addr_flags |= IFA_F_OPTIMISTIC;
2335#endif
1da177e4 2336
95c385b4
NH		 2337
2338 ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, addr_flags);
1da177e4 2339 if (!IS_ERR(ifp)) {
46d48046 2340 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
1da177e4
LT		 2341 addrconf_dad_start(ifp, 0);
2342 in6_ifa_put(ifp);
2343 }
2344}
2345
2346static void addrconf_dev_config(struct net_device *dev)
2347{
2348 struct in6_addr addr;
2349 struct inet6_dev * idev;
2350
2351 ASSERT_RTNL();
2352
74235a25
HX		 2353 if ((dev->type != ARPHRD_ETHER) &&
2354 (dev->type != ARPHRD_FDDI) &&
2355 (dev->type != ARPHRD_IEEE802_TR) &&
2356 (dev->type != ARPHRD_ARCNET) &&
2357 (dev->type != ARPHRD_INFINIBAND)) {
2358 /* Alas, we support only Ethernet autoconfiguration. */
2359 return;
2360 }
2361
1da177e4
LT		 2362 idev = addrconf_add_dev(dev);
2363 if (idev == NULL)
2364 return;
2365
2366 memset(&addr, 0, sizeof(struct in6_addr));
2367 addr.s6_addr32[0] = htonl(0xFE800000);
2368
2369 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
2370 addrconf_add_linklocal(idev, &addr);
2371}
2372
0be669bb 2373#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1da177e4
LT		 2374static void addrconf_sit_config(struct net_device *dev)
2375{
2376 struct inet6_dev *idev;
2377
2378 ASSERT_RTNL();
2379
1ab1457c
YH		 2380 /*
2381 * Configure the tunnel with one of our IPv4
2382 * addresses... we should configure all of
1da177e4
LT		 2383 * our v4 addrs in the tunnel
2384 */
2385
2386 if ((idev = ipv6_find_idev(dev)) == NULL) {
2387 printk(KERN_DEBUG "init sit: add_dev failed\n");
2388 return;
2389 }
2390
c7dc89c0
FT		 2391 if (dev->priv_flags & IFF_ISATAP) {
2392 struct in6_addr addr;
2393
2394 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
2395 addrconf_prefix_route(&addr, 64, dev, 0, 0);
2396 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2397 addrconf_add_linklocal(idev, &addr);
2398 return;
2399 }
2400
1da177e4
LT		 2401 sit_add_v4_addrs(idev);
2402
2403 if (dev->flags&IFF_POINTOPOINT) {
2404 addrconf_add_mroute(dev);
2405 addrconf_add_lroute(dev);
2406 } else
2407 sit_route_add(dev);
2408}
0be669bb 2409#endif
1da177e4
LT		 2410
2411static inline int
2412ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev)
2413{
2414 struct in6_addr lladdr;
2415
95c385b4 2416 if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) {
1da177e4
LT		 2417 addrconf_add_linklocal(idev, &lladdr);
2418 return 0;
2419 }
2420 return -1;
2421}
2422
2423static void ip6_tnl_add_linklocal(struct inet6_dev *idev)
2424{
2425 struct net_device *link_dev;
c346dca1 2426 struct net *net = dev_net(idev->dev);
1da177e4
LT		 2427
2428 /* first try to inherit the link-local address from the link device */
2429 if (idev->dev->iflink &&
6fda7350 2430 (link_dev = __dev_get_by_index(net, idev->dev->iflink))) {
1da177e4
LT		 2431 if (!ipv6_inherit_linklocal(idev, link_dev))
2432 return;
2433 }
2434 /* then try to inherit it from any device */
6fda7350 2435 for_each_netdev(net, link_dev) {
1da177e4
LT		 2436 if (!ipv6_inherit_linklocal(idev, link_dev))
2437 return;
2438 }
2439 printk(KERN_DEBUG "init ip6-ip6: add_linklocal failed\n");
2440}
2441
2442/*
2443 * Autoconfigure tunnel with a link-local address so routing protocols,
2444 * DHCPv6, MLD etc. can be run over the virtual link
2445 */
2446
2447static void addrconf_ip6_tnl_config(struct net_device *dev)
2448{
2449 struct inet6_dev *idev;
2450
2451 ASSERT_RTNL();
2452
e21e8467
SH		 2453 idev = addrconf_add_dev(dev);
2454 if (!idev) {
1da177e4
LT		 2455 printk(KERN_DEBUG "init ip6-ip6: add_dev failed\n");
2456 return;
2457 }
2458 ip6_tnl_add_linklocal(idev);
1da177e4
LT		 2459}
2460
1ab1457c 2461static int addrconf_notify(struct notifier_block *this, unsigned long event,
1da177e4
LT		 2462 void * data)
2463{
2464 struct net_device *dev = (struct net_device *) data;
74235a25 2465 struct inet6_dev *idev = __in6_dev_get(dev);
c5e33bdd 2466 int run_pending = 0;
b217d616 2467 int err;
1da177e4 2468
e21e8467 2469 switch (event) {
45ba9dd2 2470 case NETDEV_REGISTER:
74235a25 2471 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
45ba9dd2
YH		 2472 idev = ipv6_add_dev(dev);
2473 if (!idev)
b217d616 2474 return notifier_from_errno(-ENOMEM);
45ba9dd2
YH		 2475 }
2476 break;
bcdd553f 2477
1da177e4 2478 case NETDEV_UP:
3c21edbd 2479 case NETDEV_CHANGE:
c2edacf8
JV		 2480 if (dev->flags & IFF_SLAVE)
2481 break;
2482
3c21edbd 2483 if (event == NETDEV_UP) {
f24e3d65 2484 if (!addrconf_qdisc_ok(dev)) {
3c21edbd
YH		 2485 /* device is not ready yet. */
2486 printk(KERN_INFO
2487 "ADDRCONF(NETDEV_UP): %s: "
2488 "link is not ready\n",
2489 dev->name);
2490 break;
2491 }
99081049 2492
d31c7b8f
EP		 2493 if (!idev && dev->mtu >= IPV6_MIN_MTU)
2494 idev = ipv6_add_dev(dev);
2495
e3ec6cfc 2496 if (idev) {
99081049 2497 idev->if_flags |= IF_READY;
e3ec6cfc
BT		 2498 run_pending = 1;
2499 }
3c21edbd 2500 } else {
f24e3d65 2501 if (!addrconf_qdisc_ok(dev)) {
3c21edbd
YH		 2502 /* device is still not ready. */
2503 break;
2504 }
2505
2506 if (idev) {
bcdd553f 2507 if (idev->if_flags & IF_READY)
3c21edbd
YH		 2508 /* device is already configured. */
2509 break;
3c21edbd
YH		 2510 idev->if_flags |= IF_READY;
2511 }
2512
2513 printk(KERN_INFO
2514 "ADDRCONF(NETDEV_CHANGE): %s: "
2515 "link becomes ready\n",
2516 dev->name);
2517
c5e33bdd 2518 run_pending = 1;
3c21edbd
YH		 2519 }
2520
e21e8467 2521 switch (dev->type) {
0be669bb 2522#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1da177e4
LT		 2523 case ARPHRD_SIT:
2524 addrconf_sit_config(dev);
2525 break;
0be669bb 2526#endif
1da177e4
LT		 2527 case ARPHRD_TUNNEL6:
2528 addrconf_ip6_tnl_config(dev);
2529 break;
2530 case ARPHRD_LOOPBACK:
2531 init_loopback(dev);
2532 break;
2533
2534 default:
2535 addrconf_dev_config(dev);
2536 break;
3ff50b79 2537 }
bcdd553f 2538
1da177e4 2539 if (idev) {
c5e33bdd
YH		 2540 if (run_pending)
2541 addrconf_dad_run(idev);
2542
bcdd553f
SH		 2543 /*
2544 * If the MTU changed during the interface down,
2545 * when the interface up, the changed MTU must be
2546 * reflected in the idev as well as routers.
1da177e4 2547 */
bcdd553f
SH		 2548 if (idev->cnf.mtu6 != dev->mtu &&
2549 dev->mtu >= IPV6_MIN_MTU) {
1da177e4
LT		 2550 rt6_mtu_change(dev, dev->mtu);
2551 idev->cnf.mtu6 = dev->mtu;
2552 }
2553 idev->tstamp = jiffies;
2554 inet6_ifinfo_notify(RTM_NEWLINK, idev);
bcdd553f
SH		 2555
2556 /*
2557 * If the changed mtu during down is lower than
2558 * IPV6_MIN_MTU stop IPv6 on this interface.
1da177e4
LT		 2559 */
2560 if (dev->mtu < IPV6_MIN_MTU)
bcdd553f 2561 addrconf_ifdown(dev, 1);
1da177e4
LT		 2562 }
2563 break;
2564
2565 case NETDEV_CHANGEMTU:
d31c7b8f 2566 if (idev && dev->mtu >= IPV6_MIN_MTU) {
1da177e4
LT		 2567 rt6_mtu_change(dev, dev->mtu);
2568 idev->cnf.mtu6 = dev->mtu;
2569 break;
2570 }
2571
d31c7b8f
EP		 2572 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2573 idev = ipv6_add_dev(dev);
2574 if (idev)
2575 break;
2576 }
2577
bcdd553f
SH		 2578 /*
2579 * MTU falled under IPV6_MIN_MTU.
2580 * Stop IPv6 on this interface.
2581 */
1da177e4
LT		 2582
2583 case NETDEV_DOWN:
2584 case NETDEV_UNREGISTER:
2585 /*
2586 * Remove all addresses from this interface.
2587 */
2588 addrconf_ifdown(dev, event != NETDEV_DOWN);
2589 break;
3c21edbd 2590
1da177e4 2591 case NETDEV_CHANGENAME:
1da177e4 2592 if (idev) {
5632c515 2593 snmp6_unregister_dev(idev);
408c4768 2594 addrconf_sysctl_unregister(idev);
f52295a9 2595 addrconf_sysctl_register(idev);
b217d616
HX		 2596 err = snmp6_register_dev(idev);
2597 if (err)
2598 return notifier_from_errno(err);
5632c515 2599 }
1da177e4 2600 break;
bcdd553f 2601
93d9b7d7
JP		 2602 case NETDEV_PRE_TYPE_CHANGE:
2603 case NETDEV_POST_TYPE_CHANGE:
2604 addrconf_type_change(dev, event);
75c78500 2605 break;
3ff50b79 2606 }
1da177e4
LT		 2607
2608 return NOTIFY_OK;
2609}
2610
2611/*
2612 * addrconf module should be notified of a device going up
2613 */
2614static struct notifier_block ipv6_dev_notf = {
2615 .notifier_call = addrconf_notify,
1da177e4
LT		 2616};
2617
93d9b7d7 2618static void addrconf_type_change(struct net_device *dev, unsigned long event)
75c78500
MS		 2619{
2620 struct inet6_dev *idev;
2621 ASSERT_RTNL();
2622
2623 idev = __in6_dev_get(dev);
2624
93d9b7d7 2625 if (event == NETDEV_POST_TYPE_CHANGE)
75c78500 2626 ipv6_mc_remap(idev);
93d9b7d7 2627 else if (event == NETDEV_PRE_TYPE_CHANGE)
75c78500
MS		 2628 ipv6_mc_unmap(idev);
2629}
2630
1da177e4
LT		 2631static int addrconf_ifdown(struct net_device *dev, int how)
2632{
c346dca1 2633 struct net *net = dev_net(dev);
502a2ffd 2634 struct inet6_dev *idev;
2635 struct inet6_ifaddr *ifa;
2636 LIST_HEAD(keep_list);
4c5ff6a6 2637 int state;
1da177e4
LT		 2638
2639 ASSERT_RTNL();
2640
f3db4851 2641 rt6_ifdown(net, dev);
1da177e4
LT		 2642 neigh_ifdown(&nd_tbl, dev);
2643
2644 idev = __in6_dev_get(dev);
2645 if (idev == NULL)
2646 return -ENODEV;
2647
bcdd553f
SH		 2648 /*
2649 * Step 1: remove reference to ipv6 device from parent device.
2650 * Do not dev_put!
1da177e4 2651 */
439e2385 2652 if (how) {
1da177e4 2653 idev->dead = 1;
8814c4b5
YH		 2654
2655 /* protected by rtnl_lock */
2656 rcu_assign_pointer(dev->ip6_ptr, NULL);
1da177e4
LT		 2657
2658 /* Step 1.5: remove snmp6 entry */
2659 snmp6_unregister_dev(idev);
2660
2661 }
2662
1da177e4
LT		 2663 write_lock_bh(&idev->lock);
2664
bcdd553f 2665 /* Step 2: clear flags for stateless addrconf */
439e2385 2666 if (!how)
3c21edbd 2667 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
1da177e4 2668
1da177e4 2669#ifdef CONFIG_IPV6_PRIVACY
439e2385 2670 if (how && del_timer(&idev->regen_timer))
1da177e4
LT		 2671 in6_dev_put(idev);
2672
bcdd553f 2673 /* Step 3: clear tempaddr list */
372e6c8f 2674 while (!list_empty(&idev->tempaddr_list)) {
2675 ifa = list_first_entry(&idev->tempaddr_list,
2676 struct inet6_ifaddr, tmp_list);
2677 list_del(&ifa->tmp_list);
1da177e4
LT		 2678 write_unlock_bh(&idev->lock);
2679 spin_lock_bh(&ifa->lock);
2680
2681 if (ifa->ifpub) {
2682 in6_ifa_put(ifa->ifpub);
2683 ifa->ifpub = NULL;
2684 }
2685 spin_unlock_bh(&ifa->lock);
2686 in6_ifa_put(ifa);
2687 write_lock_bh(&idev->lock);
2688 }
2689#endif
8f37ada5 2690
502a2ffd 2691 while (!list_empty(&idev->addr_list)) {
2692 ifa = list_first_entry(&idev->addr_list,
2693 struct inet6_ifaddr, if_list);
84e8b803 2694 addrconf_del_timer(ifa);
2695
2696 /* If just doing link down, and address is permanent
2697 and not link-local, then retain it. */
bcdd553f 2698 if (!how &&
84e8b803 2699 (ifa->flags&IFA_F_PERMANENT) &&
2700 !(ipv6_addr_type(&ifa->addr) & IPV6_ADDR_LINKLOCAL)) {
502a2ffd 2701 list_move_tail(&ifa->if_list, &keep_list);
dc2b99f7 2702
84e8b803 2703 /* If not doing DAD on this address, just keep it. */
2704 if ((dev->flags&(IFF_NOARP|IFF_LOOPBACK)) ||
2705 idev->cnf.accept_dad <= 0 ||
2706 (ifa->flags & IFA_F_NODAD))
2707 continue;
2708
2709 /* If it was tentative already, no need to notify */
2710 if (ifa->flags & IFA_F_TENTATIVE)
2711 continue;
2712
2713 /* Flag it for later restoration when link comes up */
2714 ifa->flags |= IFA_F_TENTATIVE;
4c5ff6a6 2715
27bdb2ab 2716 write_unlock_bh(&idev->lock);
4c5ff6a6
HX		 2717
2718 in6_ifa_hold(ifa);
dc2b99f7 2719 } else {
502a2ffd 2720 list_del(&ifa->if_list);
1da177e4 2721
27bdb2ab 2722 /* clear hash table */
2723 spin_lock_bh(&addrconf_hash_lock);
2724 hlist_del_init_rcu(&ifa->addr_lst);
27bdb2ab 2725 spin_unlock_bh(&addrconf_hash_lock);
4c5ff6a6
HX		 2726
2727 write_unlock_bh(&idev->lock);
2728 spin_lock_bh(&ifa->state_lock);
2729 state = ifa->state;
2730 ifa->state = INET6_IFADDR_STATE_DEAD;
2731 spin_unlock_bh(&ifa->state_lock);
2732
2733 if (state == INET6_IFADDR_STATE_DEAD)
2734 goto put_ifa;
27bdb2ab 2735 }
c2e21293 2736
84e8b803 2737 __ipv6_ifa_notify(RTM_DELADDR, ifa);
e9d3e084 2738 if (ifa->state == INET6_IFADDR_STATE_DEAD)
8595805a 2739 atomic_notifier_call_chain(&inet6addr_chain,
2740 NETDEV_DOWN, ifa);
4c5ff6a6
HX		 2741
2742put_ifa:
84e8b803 2743 in6_ifa_put(ifa);
dc2b99f7 2744
84e8b803 2745 write_lock_bh(&idev->lock);
1da177e4 2746 }
8f37ada5 2747
502a2ffd 2748 list_splice(&keep_list, &idev->addr_list);
8f37ada5 2749
1da177e4
LT		 2750 write_unlock_bh(&idev->lock);
2751
2752 /* Step 5: Discard multicast list */
439e2385 2753 if (how)
1da177e4
LT		 2754 ipv6_mc_destroy_dev(idev);
2755 else
2756 ipv6_mc_down(idev);
2757
1da177e4 2758 idev->tstamp = jiffies;
1ab1457c 2759
bcdd553f 2760 /* Last: Shot the device (if unregistered) */
439e2385 2761 if (how) {
408c4768 2762 addrconf_sysctl_unregister(idev);
1da177e4
LT		 2763 neigh_parms_release(&nd_tbl, idev->nd_parms);
2764 neigh_ifdown(&nd_tbl, dev);
2765 in6_dev_put(idev);
2766 }
2767 return 0;
2768}
2769
2770static void addrconf_rs_timer(unsigned long data)
2771{
2772 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
5b2a1953 2773 struct inet6_dev *idev = ifp->idev;
1da177e4 2774
5b2a1953 2775 read_lock(&idev->lock);
2776 if (idev->dead || !(idev->if_flags & IF_READY))
1da177e4
LT		 2777 goto out;
2778
5b2a1953 2779 if (idev->cnf.forwarding)
2780 goto out;
2781
2782 /* Announcement received after solicitation was sent */
2783 if (idev->if_flags & IF_RA_RCVD)
1da177e4 2784 goto out;
1da177e4
LT		 2785
2786 spin_lock(&ifp->lock);
5b2a1953 2787 if (ifp->probes++ < idev->cnf.rtr_solicits) {
1da177e4
LT		 2788 /* The wait after the last probe can be shorter */
2789 addrconf_mod_timer(ifp, AC_RS,
5b2a1953 2790 (ifp->probes == idev->cnf.rtr_solicits) ?
2791 idev->cnf.rtr_solicit_delay :
2792 idev->cnf.rtr_solicit_interval);
1da177e4
LT		 2793 spin_unlock(&ifp->lock);
2794
5b2a1953 2795 ndisc_send_rs(idev->dev, &ifp->addr, &in6addr_linklocal_allrouters);
1da177e4
LT		 2796 } else {
2797 spin_unlock(&ifp->lock);
2798 /*
2799 * Note: we do not support deprecated "all on-link"
2800 * assumption any longer.
2801 */
2802 printk(KERN_DEBUG "%s: no IPv6 routers present\n",
5b2a1953 2803 idev->dev->name);
1da177e4
LT		 2804 }
2805
2806out:
5b2a1953 2807 read_unlock(&idev->lock);
1da177e4
LT		 2808 in6_ifa_put(ifp);
2809}
2810
2811/*
2812 * Duplicate Address Detection
2813 */
3c21edbd
YH		 2814static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
2815{
2816 unsigned long rand_num;
2817 struct inet6_dev *idev = ifp->idev;
2818
95c385b4
NH		 2819 if (ifp->flags & IFA_F_OPTIMISTIC)
2820 rand_num = 0;
2821 else
2822 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1);
2823
3c21edbd
YH		 2824 ifp->probes = idev->cnf.dad_transmits;
2825 addrconf_mod_timer(ifp, AC_DAD, rand_num);
2826}
2827
e431b8c0 2828static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags)
1da177e4
LT		 2829{
2830 struct inet6_dev *idev = ifp->idev;
2831 struct net_device *dev = idev->dev;
1da177e4
LT		 2832
2833 addrconf_join_solict(dev, &ifp->addr);
2834
1da177e4 2835 net_srandom(ifp->addr.s6_addr32[3]);
1da177e4
LT		 2836
2837 read_lock_bh(&idev->lock);
e9d3e084 2838 if (ifp->state == INET6_IFADDR_STATE_DEAD)
1da177e4 2839 goto out;
1da177e4 2840
21809faf 2841 spin_lock(&ifp->lock);
1da177e4 2842 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
1b34be74 2843 idev->cnf.accept_dad < 1 ||
55ebaef1
NT		 2844 !(ifp->flags&IFA_F_TENTATIVE) ||
2845 ifp->flags & IFA_F_NODAD) {
cc411d0b 2846 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
21809faf 2847 spin_unlock(&ifp->lock);
1da177e4
LT		 2848 read_unlock_bh(&idev->lock);
2849
2850 addrconf_dad_completed(ifp);
2851 return;
2852 }
2853
6732bade 2854 if (!(idev->if_flags & IF_READY)) {
21809faf 2855 spin_unlock(&ifp->lock);
6732bade 2856 read_unlock_bh(&idev->lock);
3c21edbd 2857 /*
590a9887 2858 * If the device is not ready:
3c21edbd
YH		 2859 * - keep it tentative if it is a permanent address.
2860 * - otherwise, kill it.
2861 */
2862 in6_ifa_hold(ifp);
cc411d0b 2863 addrconf_dad_stop(ifp, 0);
6732bade 2864 return;
3c21edbd 2865 }
95c385b4
NH		 2866
2867 /*
2868 * Optimistic nodes can start receiving
2869 * Frames right away
2870 */
e21e8467 2871 if (ifp->flags & IFA_F_OPTIMISTIC)
95c385b4
NH		 2872 ip6_ins_rt(ifp->rt);
2873
6732bade 2874 addrconf_dad_kick(ifp);
21809faf 2875 spin_unlock(&ifp->lock);
1da177e4
LT		 2876out:
2877 read_unlock_bh(&idev->lock);
2878}
2879
2880static void addrconf_dad_timer(unsigned long data)
2881{
2882 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2883 struct inet6_dev *idev = ifp->idev;
1da177e4
LT		 2884 struct in6_addr mcaddr;
2885
122e4519 2886 read_lock(&idev->lock);
2887 if (idev->dead || !(idev->if_flags & IF_READY)) {
2888 read_unlock(&idev->lock);
1da177e4
LT		 2889 goto out;
2890 }
21809faf 2891
2892 spin_lock(&ifp->lock);
1da177e4
LT		 2893 if (ifp->probes == 0) {
2894 /*
2895 * DAD was successful
2896 */
2897
cc411d0b 2898 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
21809faf 2899 spin_unlock(&ifp->lock);
122e4519 2900 read_unlock(&idev->lock);
1da177e4
LT		 2901
2902 addrconf_dad_completed(ifp);
2903
2904 goto out;
2905 }
2906
2907 ifp->probes--;
2908 addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time);
21809faf 2909 spin_unlock(&ifp->lock);
122e4519 2910 read_unlock(&idev->lock);
1da177e4
LT		 2911
2912 /* send a neighbour solicitation for our addr */
1da177e4 2913 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
d7aabf22 2914 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &in6addr_any);
1da177e4
LT		 2915out:
2916 in6_ifa_put(ifp);
2917}
2918
2919static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
2920{
e21e8467 2921 struct net_device *dev = ifp->idev->dev;
1da177e4
LT		 2922
2923 /*
2924 * Configure the address for reception. Now it is valid.
2925 */
2926
2927 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2928
2929 /* If added prefix is link local and forwarding is off,
2930 start sending router solicitations.
2931 */
2932
2933 if (ifp->idev->cnf.forwarding == 0 &&
2934 ifp->idev->cnf.rtr_solicits > 0 &&
2935 (dev->flags&IFF_LOOPBACK) == 0 &&
2936 (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) {
1da177e4
LT		 2937 /*
2938 * If a host as already performed a random delay
2939 * [...] as part of DAD [...] there is no need
2940 * to delay again before sending the first RS
2941 */
f3ee4010 2942 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &in6addr_linklocal_allrouters);
1da177e4
LT		 2943
2944 spin_lock_bh(&ifp->lock);
2945 ifp->probes = 1;
2946 ifp->idev->if_flags |= IF_RS_SENT;
2947 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval);
2948 spin_unlock_bh(&ifp->lock);
2949 }
2950}
2951
e21e8467
SH		 2952static void addrconf_dad_run(struct inet6_dev *idev)
2953{
c5e33bdd
YH		 2954 struct inet6_ifaddr *ifp;
2955
2956 read_lock_bh(&idev->lock);
502a2ffd 2957 list_for_each_entry(ifp, &idev->addr_list, if_list) {
21809faf 2958 spin_lock(&ifp->lock);
c5e33bdd 2959 if (!(ifp->flags & IFA_F_TENTATIVE)) {
21809faf 2960 spin_unlock(&ifp->lock);
c5e33bdd
YH		 2961 continue;
2962 }
21809faf 2963 spin_unlock(&ifp->lock);
c5e33bdd
YH		 2964 addrconf_dad_kick(ifp);
2965 }
2966 read_unlock_bh(&idev->lock);
2967}
2968
1da177e4
LT		 2969#ifdef CONFIG_PROC_FS
2970struct if6_iter_state {
3c40090a 2971 struct seq_net_private p;
1da177e4
LT		 2972 int bucket;
2973};
2974
2975static struct inet6_ifaddr *if6_get_first(struct seq_file *seq)
2976{
2977 struct inet6_ifaddr *ifa = NULL;
2978 struct if6_iter_state *state = seq->private;
1218854a 2979 struct net *net = seq_file_net(seq);
1da177e4
LT		 2980
2981 for (state->bucket = 0; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
c2e21293 2982 struct hlist_node *n;
4f70ecca 2983 hlist_for_each_entry_rcu_bh(ifa, n, &inet6_addr_lst[state->bucket],
5c578aed 2984 addr_lst)
c2e21293 2985 if (net_eq(dev_net(ifa->idev->dev), net))
2986 return ifa;
1da177e4 2987 }
c2e21293 2988 return NULL;
1da177e4
LT		 2989}
2990
c2e21293 2991static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
2992 struct inet6_ifaddr *ifa)
1da177e4
LT		 2993{
2994 struct if6_iter_state *state = seq->private;
1218854a 2995 struct net *net = seq_file_net(seq);
c2e21293 2996 struct hlist_node *n = &ifa->addr_lst;
1da177e4 2997
4f70ecca 2998 hlist_for_each_entry_continue_rcu_bh(ifa, n, addr_lst)
c2e21293 2999 if (net_eq(dev_net(ifa->idev->dev), net))
3000 return ifa;
3c40090a 3001
c2e21293 3002 while (++state->bucket < IN6_ADDR_HSIZE) {
4f70ecca 3003 hlist_for_each_entry_rcu_bh(ifa, n,
c2e21293 3004 &inet6_addr_lst[state->bucket], addr_lst) {
3005 if (net_eq(dev_net(ifa->idev->dev), net))
3006 return ifa;
3007 }
1da177e4 3008 }
3c40090a 3009
c2e21293 3010 return NULL;
1da177e4
LT		 3011}
3012
3013static struct inet6_ifaddr *if6_get_idx(struct seq_file *seq, loff_t pos)
3014{
3015 struct inet6_ifaddr *ifa = if6_get_first(seq);
3016
3017 if (ifa)
e21e8467 3018 while (pos && (ifa = if6_get_next(seq, ifa)) != NULL)
1da177e4
LT		 3019 --pos;
3020 return pos ? NULL : ifa;
3021}
3022
3023static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
4f70ecca 3024 __acquires(rcu_bh)
1da177e4 3025{
5c578aed 3026 rcu_read_lock_bh();
1da177e4
LT		 3027 return if6_get_idx(seq, *pos);
3028}
3029
3030static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3031{
3032 struct inet6_ifaddr *ifa;
3033
3034 ifa = if6_get_next(seq, v);
3035 ++*pos;
3036 return ifa;
3037}
3038
3039static void if6_seq_stop(struct seq_file *seq, void *v)
4f70ecca 3040 __releases(rcu_bh)
1da177e4 3041{
5c578aed 3042 rcu_read_unlock_bh();
1da177e4
LT		 3043}
3044
3045static int if6_seq_show(struct seq_file *seq, void *v)
3046{
3047 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
4b7a4274 3048 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
b071195d 3049 &ifp->addr,
1da177e4
LT		 3050 ifp->idev->dev->ifindex,
3051 ifp->prefix_len,
3052 ifp->scope,
3053 ifp->flags,
3054 ifp->idev->dev->name);
3055 return 0;
3056}
3057
56b3d975 3058static const struct seq_operations if6_seq_ops = {
1da177e4
LT		 3059 .start = if6_seq_start,
3060 .next = if6_seq_next,
3061 .show = if6_seq_show,
3062 .stop = if6_seq_stop,
3063};
3064
3065static int if6_seq_open(struct inode *inode, struct file *file)
3066{
3c40090a
DL		 3067 return seq_open_net(inode, file, &if6_seq_ops,
3068 sizeof(struct if6_iter_state));
1da177e4
LT		 3069}
3070
9a32144e 3071static const struct file_operations if6_fops = {
1da177e4
LT		 3072 .owner = THIS_MODULE,
3073 .open = if6_seq_open,
3074 .read = seq_read,
3075 .llseek = seq_lseek,
3c40090a 3076 .release = seq_release_net,
1da177e4
LT		 3077};
3078
2c8c1e72 3079static int __net_init if6_proc_net_init(struct net *net)
1da177e4 3080{
3c40090a 3081 if (!proc_net_fops_create(net, "if_inet6", S_IRUGO, &if6_fops))
1da177e4
LT		 3082 return -ENOMEM;
3083 return 0;
3084}
3085
2c8c1e72 3086static void __net_exit if6_proc_net_exit(struct net *net)
3c40090a
DL		 3087{
3088 proc_net_remove(net, "if_inet6");
3089}
3090
3091static struct pernet_operations if6_proc_net_ops = {
3092 .init = if6_proc_net_init,
3093 .exit = if6_proc_net_exit,
3094};
3095
3096int __init if6_proc_init(void)
3097{
3098 return register_pernet_subsys(&if6_proc_net_ops);
3099}
3100
1da177e4
LT		 3101void if6_proc_exit(void)
3102{
3c40090a 3103 unregister_pernet_subsys(&if6_proc_net_ops);
1da177e4
LT		 3104}
3105#endif /* CONFIG_PROC_FS */
3106
59fbb3a6 3107#if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
3b9f9a1c 3108/* Check if address is a home address configured on any interface. */
389f6612 3109int ipv6_chk_home_addr(struct net *net, struct in6_addr *addr)
3b9f9a1c
NT		 3110{
3111 int ret = 0;
c2e21293 3112 struct inet6_ifaddr *ifp = NULL;
3113 struct hlist_node *n;
3a88a81d 3114 unsigned int hash = ipv6_addr_hash(addr);
c2e21293 3115
5c578aed 3116 rcu_read_lock_bh();
4f70ecca 3117 hlist_for_each_entry_rcu_bh(ifp, n, &inet6_addr_lst[hash], addr_lst) {
878628fb 3118 if (!net_eq(dev_net(ifp->idev->dev), net))
389f6612 3119 continue;
caad295f 3120 if (ipv6_addr_equal(&ifp->addr, addr) &&
3b9f9a1c
NT		 3121 (ifp->flags & IFA_F_HOMEADDRESS)) {
3122 ret = 1;
3123 break;
3124 }
3125 }
5c578aed 3126 rcu_read_unlock_bh();
3b9f9a1c
NT		 3127 return ret;
3128}
3129#endif
3130
1da177e4
LT		 3131/*
3132 * Periodic address status verification
3133 */
3134
3135static void addrconf_verify(unsigned long foo)
3136{
b2db7564 3137 unsigned long now, next, next_sec, next_sched;
1da177e4 3138 struct inet6_ifaddr *ifp;
c2e21293 3139 struct hlist_node *node;
1da177e4
LT		 3140 int i;
3141
5c578aed 3142 rcu_read_lock_bh();
3143 spin_lock(&addrconf_verify_lock);
1da177e4 3144 now = jiffies;
b2db7564 3145 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
1da177e4
LT		 3146
3147 del_timer(&addr_chk_timer);
3148
bcdd553f 3149 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
1da177e4 3150restart:
4f70ecca 3151 hlist_for_each_entry_rcu_bh(ifp, node,
5c578aed 3152 &inet6_addr_lst[i], addr_lst) {
1da177e4 3153 unsigned long age;
1da177e4
LT		 3154
3155 if (ifp->flags & IFA_F_PERMANENT)
3156 continue;
3157
3158 spin_lock(&ifp->lock);
b2db7564
YH		 3159 /* We try to batch several events at once. */
3160 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
1da177e4 3161
8f27ebb9
YH		 3162 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
3163 age >= ifp->valid_lft) {
1da177e4
LT		 3164 spin_unlock(&ifp->lock);
3165 in6_ifa_hold(ifp);
1da177e4
LT		 3166 ipv6_del_addr(ifp);
3167 goto restart;
8f27ebb9
YH		 3168 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
3169 spin_unlock(&ifp->lock);
3170 continue;
1da177e4 3171 } else if (age >= ifp->prefered_lft) {
a1ed0526 3172 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
1da177e4
LT		 3173 int deprecate = 0;
3174
3175 if (!(ifp->flags&IFA_F_DEPRECATED)) {
3176 deprecate = 1;
3177 ifp->flags |= IFA_F_DEPRECATED;
3178 }
3179
3180 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))
3181 next = ifp->tstamp + ifp->valid_lft * HZ;
3182
3183 spin_unlock(&ifp->lock);
3184
3185 if (deprecate) {
3186 in6_ifa_hold(ifp);
1da177e4
LT		 3187
3188 ipv6_ifa_notify(0, ifp);
3189 in6_ifa_put(ifp);
3190 goto restart;
3191 }
3192#ifdef CONFIG_IPV6_PRIVACY
3193 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
3194 !(ifp->flags&IFA_F_TENTATIVE)) {
88949cf4 3195 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
3196 ifp->idev->cnf.dad_transmits *
3197 ifp->idev->nd_parms->retrans_time / HZ;
3198
1da177e4
LT		 3199 if (age >= ifp->prefered_lft - regen_advance) {
3200 struct inet6_ifaddr *ifpub = ifp->ifpub;
3201 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3202 next = ifp->tstamp + ifp->prefered_lft * HZ;
3203 if (!ifp->regen_count && ifpub) {
3204 ifp->regen_count++;
3205 in6_ifa_hold(ifp);
3206 in6_ifa_hold(ifpub);
3207 spin_unlock(&ifp->lock);
5c578aed 3208
291d809b
HY		 3209 spin_lock(&ifpub->lock);
3210 ifpub->regen_count = 0;
3211 spin_unlock(&ifpub->lock);
1da177e4
LT		 3212 ipv6_create_tempaddr(ifpub, ifp);
3213 in6_ifa_put(ifpub);
3214 in6_ifa_put(ifp);
3215 goto restart;
3216 }
3217 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
3218 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
3219 spin_unlock(&ifp->lock);
3220#endif
3221 } else {
3222 /* ifp->prefered_lft <= ifp->valid_lft */
3223 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3224 next = ifp->tstamp + ifp->prefered_lft * HZ;
3225 spin_unlock(&ifp->lock);
3226 }
3227 }
1da177e4
LT		 3228 }
3229
b2db7564
YH		 3230 next_sec = round_jiffies_up(next);
3231 next_sched = next;
3232
3233 /* If rounded timeout is accurate enough, accept it. */
3234 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
3235 next_sched = next_sec;
3236
3237 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
3238 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
3239 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
3240
3241 ADBG((KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
3242 now, next, next_sec, next_sched));
3243
3244 addr_chk_timer.expires = next_sched;
1da177e4 3245 add_timer(&addr_chk_timer);
5c578aed 3246 spin_unlock(&addrconf_verify_lock);
3247 rcu_read_unlock_bh();
1da177e4
LT		 3248}
3249
461d8837
TG		 3250static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local)
3251{
3252 struct in6_addr *pfx = NULL;
3253
3254 if (addr)
3255 pfx = nla_data(addr);
3256
3257 if (local) {
3258 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
3259 pfx = NULL;
3260 else
3261 pfx = nla_data(local);
3262 }
3263
3264 return pfx;
3265}
3266
ef7c79ed 3267static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
461d8837
TG		 3268 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
3269 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
3270 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
3271};
3272
1da177e4
LT		 3273static int
3274inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3275{
3b1e0a65 3276 struct net *net = sock_net(skb->sk);
b933f716
TG		 3277 struct ifaddrmsg *ifm;
3278 struct nlattr *tb[IFA_MAX+1];
1da177e4 3279 struct in6_addr *pfx;
b933f716 3280 int err;
1da177e4 3281
b933f716
TG		 3282 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3283 if (err < 0)
3284 return err;
3285
3286 ifm = nlmsg_data(nlh);
3287 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
1da177e4
LT		 3288 if (pfx == NULL)
3289 return -EINVAL;
3290
af284937 3291 return inet6_addr_del(net, ifm->ifa_index, pfx, ifm->ifa_prefixlen);
1da177e4
LT		 3292}
3293
55ebaef1
NT		 3294static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags,
3295 u32 prefered_lft, u32 valid_lft)
081bba5b 3296{
6f704992
YH		 3297 u32 flags;
3298 clock_t expires;
4bed72e4 3299 unsigned long timeout;
46d48046 3300
081bba5b
NT		 3301 if (!valid_lft || (prefered_lft > valid_lft))
3302 return -EINVAL;
3303
4bed72e4
YH		 3304 timeout = addrconf_timeout_fixup(valid_lft, HZ);
3305 if (addrconf_finite_timeout(timeout)) {
3306 expires = jiffies_to_clock_t(timeout * HZ);
3307 valid_lft = timeout;
6f704992 3308 flags = RTF_EXPIRES;
4bed72e4
YH		 3309 } else {
3310 expires = 0;
3311 flags = 0;
3312 ifa_flags |= IFA_F_PERMANENT;
6f704992 3313 }
081bba5b 3314
4bed72e4
YH		 3315 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
3316 if (addrconf_finite_timeout(timeout)) {
3317 if (timeout == 0)
3318 ifa_flags |= IFA_F_DEPRECATED;
3319 prefered_lft = timeout;
3320 }
081bba5b
NT		 3321
3322 spin_lock_bh(&ifp->lock);
3b9f9a1c 3323 ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags;
081bba5b
NT		 3324 ifp->tstamp = jiffies;
3325 ifp->valid_lft = valid_lft;
3326 ifp->prefered_lft = prefered_lft;
3327
3328 spin_unlock_bh(&ifp->lock);
3329 if (!(ifp->flags&IFA_F_TENTATIVE))
3330 ipv6_ifa_notify(0, ifp);
081bba5b 3331
46d48046 3332 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
6f704992 3333 expires, flags);
081bba5b
NT		 3334 addrconf_verify(0);
3335
3336 return 0;
3337}
3338
1da177e4
LT		 3339static int
3340inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3341{
3b1e0a65 3342 struct net *net = sock_net(skb->sk);
461d8837
TG		 3343 struct ifaddrmsg *ifm;
3344 struct nlattr *tb[IFA_MAX+1];
1da177e4 3345 struct in6_addr *pfx;
7198f8ce
TG		 3346 struct inet6_ifaddr *ifa;
3347 struct net_device *dev;
55ebaef1
NT		 3348 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
3349 u8 ifa_flags;
461d8837 3350 int err;
1da177e4 3351
461d8837
TG		 3352 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3353 if (err < 0)
3354 return err;
3355
3356 ifm = nlmsg_data(nlh);
3357 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
1da177e4
LT		 3358 if (pfx == NULL)
3359 return -EINVAL;
3360
461d8837 3361 if (tb[IFA_CACHEINFO]) {
0778769d 3362 struct ifa_cacheinfo *ci;
461d8837
TG		 3363
3364 ci = nla_data(tb[IFA_CACHEINFO]);
0778769d 3365 valid_lft = ci->ifa_valid;
461d8837
TG		 3366 preferred_lft = ci->ifa_prefered;
3367 } else {
3368 preferred_lft = INFINITY_LIFE_TIME;
3369 valid_lft = INFINITY_LIFE_TIME;
0778769d
NT		 3370 }
3371
af284937 3372 dev = __dev_get_by_index(net, ifm->ifa_index);
7198f8ce
TG		 3373 if (dev == NULL)
3374 return -ENODEV;
3375
55ebaef1 3376 /* We ignore other flags so far. */
3b9f9a1c 3377 ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS);
55ebaef1 3378
1cab3da6 3379 ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
7198f8ce
TG		 3380 if (ifa == NULL) {
3381 /*
3382 * It would be best to check for !NLM_F_CREATE here but
3383 * userspace alreay relies on not having to provide this.
3384 */
af284937
DL		 3385 return inet6_addr_add(net, ifm->ifa_index, pfx,
3386 ifm->ifa_prefixlen, ifa_flags,
3387 preferred_lft, valid_lft);
081bba5b
NT		 3388 }
3389
7198f8ce
TG		 3390 if (nlh->nlmsg_flags & NLM_F_EXCL ||
3391 !(nlh->nlmsg_flags & NLM_F_REPLACE))
3392 err = -EEXIST;
3393 else
55ebaef1 3394 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
7198f8ce
TG		 3395
3396 in6_ifa_put(ifa);
3397
3398 return err;
1da177e4
LT		 3399}
3400
101bb229
TG		 3401static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags,
3402 u8 scope, int ifindex)
3403{
3404 struct ifaddrmsg *ifm;
3405
3406 ifm = nlmsg_data(nlh);
3407 ifm->ifa_family = AF_INET6;
3408 ifm->ifa_prefixlen = prefixlen;
3409 ifm->ifa_flags = flags;
3410 ifm->ifa_scope = scope;
3411 ifm->ifa_index = ifindex;
3412}
3413
85486af0
TG		 3414static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
3415 unsigned long tstamp, u32 preferred, u32 valid)
3416{
3417 struct ifa_cacheinfo ci;
3418
3419 ci.cstamp = (u32)(TIME_DELTA(cstamp, INITIAL_JIFFIES) / HZ * 100
3420 + TIME_DELTA(cstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3421 ci.tstamp = (u32)(TIME_DELTA(tstamp, INITIAL_JIFFIES) / HZ * 100
3422 + TIME_DELTA(tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3423 ci.ifa_prefered = preferred;
3424 ci.ifa_valid = valid;
3425
3426 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
3427}
3428
101bb229
TG		 3429static inline int rt_scope(int ifa_scope)
3430{
3431 if (ifa_scope & IFA_HOST)
3432 return RT_SCOPE_HOST;
3433 else if (ifa_scope & IFA_LINK)
3434 return RT_SCOPE_LINK;
3435 else if (ifa_scope & IFA_SITE)
3436 return RT_SCOPE_SITE;
3437 else
3438 return RT_SCOPE_UNIVERSE;
3439}
3440
0ab6803b
TG		 3441static inline int inet6_ifaddr_msgsize(void)
3442{
339bf98f
TG		 3443 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
3444 + nla_total_size(16) /* IFA_ADDRESS */
3445 + nla_total_size(sizeof(struct ifa_cacheinfo));
0ab6803b 3446}
c5396a31 3447
1da177e4 3448static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
b6544c0b 3449 u32 pid, u32 seq, int event, unsigned int flags)
1da177e4 3450{
1da177e4 3451 struct nlmsghdr *nlh;
85486af0 3452 u32 preferred, valid;
1da177e4 3453
0ab6803b
TG		 3454 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3455 if (nlh == NULL)
26932566 3456 return -EMSGSIZE;
0ab6803b 3457
101bb229
TG		 3458 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
3459 ifa->idev->dev->ifindex);
3460
1da177e4 3461 if (!(ifa->flags&IFA_F_PERMANENT)) {
85486af0
TG		 3462 preferred = ifa->prefered_lft;
3463 valid = ifa->valid_lft;
3464 if (preferred != INFINITY_LIFE_TIME) {
1da177e4 3465 long tval = (jiffies - ifa->tstamp)/HZ;
a1faa698
JR		 3466 if (preferred > tval)
3467 preferred -= tval;
3468 else
3469 preferred = 0;
85486af0
TG		 3470 if (valid != INFINITY_LIFE_TIME)
3471 valid -= tval;
1da177e4
LT		 3472 }
3473 } else {
85486af0
TG		 3474 preferred = INFINITY_LIFE_TIME;
3475 valid = INFINITY_LIFE_TIME;
3476 }
3477
0ab6803b 3478 if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0 ||
26932566
PM		 3479 put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) {
3480 nlmsg_cancel(skb, nlh);
3481 return -EMSGSIZE;
3482 }
1da177e4 3483
0ab6803b 3484 return nlmsg_end(skb, nlh);
1da177e4
LT		 3485}
3486
3487static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
e431b8c0 3488 u32 pid, u32 seq, int event, u16 flags)
1da177e4 3489{
1da177e4 3490 struct nlmsghdr *nlh;
101bb229
TG		 3491 u8 scope = RT_SCOPE_UNIVERSE;
3492 int ifindex = ifmca->idev->dev->ifindex;
3493
3494 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
3495 scope = RT_SCOPE_SITE;
1da177e4 3496
0ab6803b
TG		 3497 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3498 if (nlh == NULL)
26932566 3499 return -EMSGSIZE;
85486af0 3500
0ab6803b
TG		 3501 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3502 if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 ||
3503 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
26932566
PM		 3504 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3505 nlmsg_cancel(skb, nlh);
3506 return -EMSGSIZE;
3507 }
85486af0 3508
0ab6803b 3509 return nlmsg_end(skb, nlh);
1da177e4
LT		 3510}
3511
3512static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
b6544c0b 3513 u32 pid, u32 seq, int event, unsigned int flags)
1da177e4 3514{
1da177e4 3515 struct nlmsghdr *nlh;
101bb229
TG		 3516 u8 scope = RT_SCOPE_UNIVERSE;
3517 int ifindex = ifaca->aca_idev->dev->ifindex;
3518
3519 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
3520 scope = RT_SCOPE_SITE;
1da177e4 3521
0ab6803b
TG		 3522 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3523 if (nlh == NULL)
26932566 3524 return -EMSGSIZE;
85486af0 3525
0ab6803b
TG		 3526 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3527 if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 ||
3528 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
26932566
PM		 3529 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3530 nlmsg_cancel(skb, nlh);
3531 return -EMSGSIZE;
3532 }
1da177e4 3533
0ab6803b 3534 return nlmsg_end(skb, nlh);
1da177e4
LT		 3535}
3536
e21e8467 3537enum addr_type_t {
1da177e4
LT		 3538 UNICAST_ADDR,
3539 MULTICAST_ADDR,
3540 ANYCAST_ADDR,
3541};
3542
234b27c3
ED		 3543/* called with rcu_read_lock() */
3544static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
3545 struct netlink_callback *cb, enum addr_type_t type,
3546 int s_ip_idx, int *p_ip_idx)
3547{
234b27c3
ED		 3548 struct ifmcaddr6 *ifmca;
3549 struct ifacaddr6 *ifaca;
3550 int err = 1;
3551 int ip_idx = *p_ip_idx;
3552
3553 read_lock_bh(&idev->lock);
3554 switch (type) {
502a2ffd 3555 case UNICAST_ADDR: {
3556 struct inet6_ifaddr *ifa;
3557
234b27c3 3558 /* unicast address incl. temp addr */
502a2ffd 3559 list_for_each_entry(ifa, &idev->addr_list, if_list) {
3560 if (++ip_idx < s_ip_idx)
234b27c3
ED		 3561 continue;
3562 err = inet6_fill_ifaddr(skb, ifa,
3563 NETLINK_CB(cb->skb).pid,
3564 cb->nlh->nlmsg_seq,
3565 RTM_NEWADDR,
3566 NLM_F_MULTI);
3567 if (err <= 0)
3568 break;
3569 }
3570 break;
502a2ffd 3571 }
234b27c3
ED		 3572 case MULTICAST_ADDR:
3573 /* multicast address */
3574 for (ifmca = idev->mc_list; ifmca;
3575 ifmca = ifmca->next, ip_idx++) {
3576 if (ip_idx < s_ip_idx)
3577 continue;
3578 err = inet6_fill_ifmcaddr(skb, ifmca,
3579 NETLINK_CB(cb->skb).pid,
3580 cb->nlh->nlmsg_seq,
3581 RTM_GETMULTICAST,
3582 NLM_F_MULTI);
3583 if (err <= 0)
3584 break;
3585 }
3586 break;
3587 case ANYCAST_ADDR:
3588 /* anycast address */
3589 for (ifaca = idev->ac_list; ifaca;
3590 ifaca = ifaca->aca_next, ip_idx++) {
3591 if (ip_idx < s_ip_idx)
3592 continue;
3593 err = inet6_fill_ifacaddr(skb, ifaca,
3594 NETLINK_CB(cb->skb).pid,
3595 cb->nlh->nlmsg_seq,
3596 RTM_GETANYCAST,
3597 NLM_F_MULTI);
3598 if (err <= 0)
3599 break;
3600 }
3601 break;
3602 default:
3603 break;
3604 }
3605 read_unlock_bh(&idev->lock);
3606 *p_ip_idx = ip_idx;
3607 return err;
3608}
3609
1da177e4
LT		 3610static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
3611 enum addr_type_t type)
3612{
234b27c3
ED		 3613 struct net *net = sock_net(skb->sk);
3614 int h, s_h;
1da177e4
LT		 3615 int idx, ip_idx;
3616 int s_idx, s_ip_idx;
1da177e4 3617 struct net_device *dev;
234b27c3
ED		 3618 struct inet6_dev *idev;
3619 struct hlist_head *head;
3620 struct hlist_node *node;
1ab1457c 3621
234b27c3
ED		 3622 s_h = cb->args[0];
3623 s_idx = idx = cb->args[1];
3624 s_ip_idx = ip_idx = cb->args[2];
5d5619b4 3625
234b27c3
ED		 3626 rcu_read_lock();
3627 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
3628 idx = 0;
3629 head = &net->dev_index_head[h];
3630 hlist_for_each_entry_rcu(dev, node, head, index_hlist) {
3631 if (idx < s_idx)
3632 goto cont;
4b97efdf 3633 if (h > s_h || idx > s_idx)
234b27c3
ED		 3634 s_ip_idx = 0;
3635 ip_idx = 0;
e21e8467
SH		 3636 idev = __in6_dev_get(dev);
3637 if (!idev)
234b27c3
ED		 3638 goto cont;
3639
3640 if (in6_dump_addrs(idev, skb, cb, type,
3641 s_ip_idx, &ip_idx) <= 0)
3642 goto done;
7562f876 3643cont:
234b27c3
ED		 3644 idx++;
3645 }
1da177e4 3646 }
234b27c3
ED		 3647done:
3648 rcu_read_unlock();
3649 cb->args[0] = h;
3650 cb->args[1] = idx;
3651 cb->args[2] = ip_idx;
3652
1da177e4
LT		 3653 return skb->len;
3654}
3655
3656static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
3657{
3658 enum addr_type_t type = UNICAST_ADDR;
b854272b 3659
1da177e4
LT		 3660 return inet6_dump_addr(skb, cb, type);
3661}
3662
3663static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
3664{
3665 enum addr_type_t type = MULTICAST_ADDR;
b854272b 3666
1da177e4
LT		 3667 return inet6_dump_addr(skb, cb, type);
3668}
3669
3670
3671static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
3672{
3673 enum addr_type_t type = ANYCAST_ADDR;
b854272b 3674
1da177e4
LT		 3675 return inet6_dump_addr(skb, cb, type);
3676}
3677
1b29fc2c
TG		 3678static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr* nlh,
3679 void *arg)
6c223828 3680{
3b1e0a65 3681 struct net *net = sock_net(in_skb->sk);
1b29fc2c
TG		 3682 struct ifaddrmsg *ifm;
3683 struct nlattr *tb[IFA_MAX+1];
6c223828
NT		 3684 struct in6_addr *addr = NULL;
3685 struct net_device *dev = NULL;
3686 struct inet6_ifaddr *ifa;
3687 struct sk_buff *skb;
6c223828
NT		 3688 int err;
3689
1b29fc2c
TG		 3690 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3691 if (err < 0)
3692 goto errout;
3693
3694 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3695 if (addr == NULL) {
3696 err = -EINVAL;
3697 goto errout;
6c223828 3698 }
6c223828 3699
1b29fc2c 3700 ifm = nlmsg_data(nlh);
6c223828 3701 if (ifm->ifa_index)
6fda7350 3702 dev = __dev_get_by_index(net, ifm->ifa_index);
6c223828 3703
e21e8467
SH		 3704 ifa = ipv6_get_ifaddr(net, addr, dev, 1);
3705 if (!ifa) {
1b29fc2c
TG		 3706 err = -EADDRNOTAVAIL;
3707 goto errout;
3708 }
6c223828 3709
e21e8467
SH		 3710 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
3711 if (!skb) {
6c223828 3712 err = -ENOBUFS;
1b29fc2c 3713 goto errout_ifa;
6c223828
NT		 3714 }
3715
6c223828
NT		 3716 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).pid,
3717 nlh->nlmsg_seq, RTM_NEWADDR, 0);
26932566
PM		 3718 if (err < 0) {
3719 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3720 WARN_ON(err == -EMSGSIZE);
3721 kfree_skb(skb);
3722 goto errout_ifa;
3723 }
6fda7350 3724 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).pid);
1b29fc2c 3725errout_ifa:
6c223828 3726 in6_ifa_put(ifa);
1b29fc2c 3727errout:
6c223828 3728 return err;
6c223828
NT		 3729}
3730
1da177e4
LT		 3731static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
3732{
3733 struct sk_buff *skb;
c346dca1 3734 struct net *net = dev_net(ifa->idev->dev);
5d620266 3735 int err = -ENOBUFS;
1da177e4 3736
0ab6803b 3737 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
5d620266
TG		 3738 if (skb == NULL)
3739 goto errout;
3740
3741 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
26932566
PM		 3742 if (err < 0) {
3743 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3744 WARN_ON(err == -EMSGSIZE);
3745 kfree_skb(skb);
3746 goto errout;
3747 }
1ce85fe4
PNA		 3748 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
3749 return;
5d620266
TG		 3750errout:
3751 if (err < 0)
6fda7350 3752 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
1da177e4
LT		 3753}
3754
b6f99a21 3755static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
1da177e4
LT		 3756 __s32 *array, int bytes)
3757{
04561c1f
TG		 3758 BUG_ON(bytes < (DEVCONF_MAX * 4));
3759
1da177e4
LT		 3760 memset(array, 0, bytes);
3761 array[DEVCONF_FORWARDING] = cnf->forwarding;
3762 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
3763 array[DEVCONF_MTU6] = cnf->mtu6;
3764 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
3765 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
3766 array[DEVCONF_AUTOCONF] = cnf->autoconf;
3767 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
3768 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
3769 array[DEVCONF_RTR_SOLICIT_INTERVAL] = cnf->rtr_solicit_interval;
3770 array[DEVCONF_RTR_SOLICIT_DELAY] = cnf->rtr_solicit_delay;
3771 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
3772#ifdef CONFIG_IPV6_PRIVACY
3773 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
3774 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
3775 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
3776 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
3777 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
3778#endif
3779 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
65f5c7c1 3780 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
c4fd30eb 3781 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
930d6ff2
YH		 3782#ifdef CONFIG_IPV6_ROUTER_PREF
3783 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
52e16356 3784 array[DEVCONF_RTR_PROBE_INTERVAL] = cnf->rtr_probe_interval;
fa03ef38 3785#ifdef CONFIG_IPV6_ROUTE_INFO
09c884d4
YH		 3786 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
3787#endif
930d6ff2 3788#endif
fbea49e1 3789 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
0bcbc926 3790 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
95c385b4
NH		 3791#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
3792 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
3793#endif
7bc570c8
YH		 3794#ifdef CONFIG_IPV6_MROUTE
3795 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
3796#endif
778d80be 3797 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
1b34be74 3798 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
c3faca05 3799 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
1da177e4
LT		 3800}
3801
339bf98f
TG		 3802static inline size_t inet6_if_nlmsg_size(void)
3803{
3804 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
3805 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
3806 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
3807 + nla_total_size(4) /* IFLA_MTU */
3808 + nla_total_size(4) /* IFLA_LINK */
3809 + nla_total_size( /* IFLA_PROTINFO */
3810 nla_total_size(4) /* IFLA_INET6_FLAGS */
3811 + nla_total_size(sizeof(struct ifla_cacheinfo))
3812 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
bf99f1bd
YH		 3813 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
3814 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
339bf98f
TG		 3815 );
3816}
c5396a31 3817
7d720c3e
TH		 3818static inline void __snmp6_fill_stats(u64 *stats, void __percpu **mib,
3819 int items, int bytes)
7f7d9a6b
HX		 3820{
3821 int i;
3822 int pad = bytes - sizeof(u64) * items;
3823 BUG_ON(pad < 0);
3824
3825 /* Use put_unaligned() because stats may not be aligned for u64. */
3826 put_unaligned(items, &stats[0]);
3827 for (i = 1; i < items; i++)
3828 put_unaligned(snmp_fold_field(mib, i), &stats[i]);
3829
3830 memset(&stats[items], 0, pad);
3831}
3832
3833static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
3834 int bytes)
3835{
e21e8467 3836 switch (attrtype) {
7f7d9a6b 3837 case IFLA_INET6_STATS:
7d720c3e 3838 __snmp6_fill_stats(stats, (void __percpu **)idev->stats.ipv6, IPSTATS_MIB_MAX, bytes);
7f7d9a6b
HX		 3839 break;
3840 case IFLA_INET6_ICMP6STATS:
7d720c3e 3841 __snmp6_fill_stats(stats, (void __percpu **)idev->stats.icmpv6, ICMP6_MIB_MAX, bytes);
7f7d9a6b
HX		 3842 break;
3843 }
3844}
3845
1ab1457c 3846static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
b6544c0b 3847 u32 pid, u32 seq, int event, unsigned int flags)
1da177e4 3848{
04561c1f 3849 struct net_device *dev = idev->dev;
bf99f1bd 3850 struct nlattr *nla;
04561c1f
TG		 3851 struct ifinfomsg *hdr;
3852 struct nlmsghdr *nlh;
3853 void *protoinfo;
3854 struct ifla_cacheinfo ci;
3855
3856 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*hdr), flags);
3857 if (nlh == NULL)
26932566 3858 return -EMSGSIZE;
04561c1f
TG		 3859
3860 hdr = nlmsg_data(nlh);
3861 hdr->ifi_family = AF_INET6;
3862 hdr->__ifi_pad = 0;
3863 hdr->ifi_type = dev->type;
3864 hdr->ifi_index = dev->ifindex;
3865 hdr->ifi_flags = dev_get_flags(dev);
3866 hdr->ifi_change = 0;
3867
3868 NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name);
1da177e4
LT		 3869
3870 if (dev->addr_len)
04561c1f 3871 NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
1da177e4 3872
04561c1f 3873 NLA_PUT_U32(skb, IFLA_MTU, dev->mtu);
1da177e4 3874 if (dev->ifindex != dev->iflink)
04561c1f 3875 NLA_PUT_U32(skb, IFLA_LINK, dev->iflink);
1da177e4 3876
04561c1f
TG		 3877 protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
3878 if (protoinfo == NULL)
3879 goto nla_put_failure;
1da177e4 3880
04561c1f 3881 NLA_PUT_U32(skb, IFLA_INET6_FLAGS, idev->if_flags);
1da177e4 3882
1da177e4
LT		 3883 ci.max_reasm_len = IPV6_MAXPLEN;
3884 ci.tstamp = (__u32)(TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) / HZ * 100
3885 + TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3886 ci.reachable_time = idev->nd_parms->reachable_time;
3887 ci.retrans_time = idev->nd_parms->retrans_time;
04561c1f
TG		 3888 NLA_PUT(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci);
3889
bf99f1bd
YH		 3890 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
3891 if (nla == NULL)
04561c1f 3892 goto nla_put_failure;
bf99f1bd 3893 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
1da177e4 3894
bf99f1bd
YH		 3895 /* XXX - MC not implemented */
3896
3897 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
3898 if (nla == NULL)
3899 goto nla_put_failure;
3900 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
3901
3902 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
3903 if (nla == NULL)
3904 goto nla_put_failure;
3905 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
1da177e4 3906
04561c1f
TG		 3907 nla_nest_end(skb, protoinfo);
3908 return nlmsg_end(skb, nlh);
1da177e4 3909
04561c1f 3910nla_put_failure:
26932566
PM		 3911 nlmsg_cancel(skb, nlh);
3912 return -EMSGSIZE;
1da177e4
LT		 3913}
3914
3915static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
3916{
3b1e0a65 3917 struct net *net = sock_net(skb->sk);
84d2697d 3918 int h, s_h;
434a8a58 3919 int idx = 0, s_idx;
1da177e4
LT		 3920 struct net_device *dev;
3921 struct inet6_dev *idev;
84d2697d
ED		 3922 struct hlist_head *head;
3923 struct hlist_node *node;
1da177e4 3924
84d2697d
ED		 3925 s_h = cb->args[0];
3926 s_idx = cb->args[1];
3927
3928 rcu_read_lock();
3929 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
3930 idx = 0;
3931 head = &net->dev_index_head[h];
3932 hlist_for_each_entry_rcu(dev, node, head, index_hlist) {
3933 if (idx < s_idx)
3934 goto cont;
3935 idev = __in6_dev_get(dev);
3936 if (!idev)
3937 goto cont;
3938 if (inet6_fill_ifinfo(skb, idev,
3939 NETLINK_CB(cb->skb).pid,
3940 cb->nlh->nlmsg_seq,
3941 RTM_NEWLINK, NLM_F_MULTI) <= 0)
3942 goto out;
7562f876 3943cont:
84d2697d
ED		 3944 idx++;
3945 }
1da177e4 3946 }
84d2697d
ED		 3947out:
3948 rcu_read_unlock();
3949 cb->args[1] = idx;
3950 cb->args[0] = h;
1da177e4
LT		 3951
3952 return skb->len;
3953}
3954
3955void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
3956{
3957 struct sk_buff *skb;
c346dca1 3958 struct net *net = dev_net(idev->dev);
8d7a76c9 3959 int err = -ENOBUFS;
1ab1457c 3960
339bf98f 3961 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
8d7a76c9
TG		 3962 if (skb == NULL)
3963 goto errout;
3964
3965 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
26932566
PM		 3966 if (err < 0) {
3967 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
3968 WARN_ON(err == -EMSGSIZE);
3969 kfree_skb(skb);
3970 goto errout;
3971 }
1ce85fe4
PNA		 3972 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
3973 return;
8d7a76c9
TG		 3974errout:
3975 if (err < 0)
6fda7350 3976 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
1da177e4
LT		 3977}
3978
339bf98f
TG		 3979static inline size_t inet6_prefix_nlmsg_size(void)
3980{
3981 return NLMSG_ALIGN(sizeof(struct prefixmsg))
3982 + nla_total_size(sizeof(struct in6_addr))
3983 + nla_total_size(sizeof(struct prefix_cacheinfo));
3984}
c5396a31 3985
1da177e4 3986static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
6051e2f4
TG		 3987 struct prefix_info *pinfo, u32 pid, u32 seq,
3988 int event, unsigned int flags)
1da177e4 3989{
6051e2f4
TG		 3990 struct prefixmsg *pmsg;
3991 struct nlmsghdr *nlh;
1da177e4
LT		 3992 struct prefix_cacheinfo ci;
3993
6051e2f4
TG		 3994 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*pmsg), flags);
3995 if (nlh == NULL)
26932566 3996 return -EMSGSIZE;
6051e2f4
TG		 3997
3998 pmsg = nlmsg_data(nlh);
1da177e4 3999 pmsg->prefix_family = AF_INET6;
8a47077a
PM		 4000 pmsg->prefix_pad1 = 0;
4001 pmsg->prefix_pad2 = 0;
1da177e4
LT		 4002 pmsg->prefix_ifindex = idev->dev->ifindex;
4003 pmsg->prefix_len = pinfo->prefix_len;
4004 pmsg->prefix_type = pinfo->type;
8a47077a 4005 pmsg->prefix_pad3 = 0;
1da177e4
LT		 4006 pmsg->prefix_flags = 0;
4007 if (pinfo->onlink)
4008 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
4009 if (pinfo->autoconf)
4010 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
4011
6051e2f4 4012 NLA_PUT(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix);
1da177e4
LT		 4013
4014 ci.preferred_time = ntohl(pinfo->prefered);
4015 ci.valid_time = ntohl(pinfo->valid);
6051e2f4 4016 NLA_PUT(skb, PREFIX_CACHEINFO, sizeof(ci), &ci);
1da177e4 4017
6051e2f4 4018 return nlmsg_end(skb, nlh);
1da177e4 4019
6051e2f4 4020nla_put_failure:
26932566
PM		 4021 nlmsg_cancel(skb, nlh);
4022 return -EMSGSIZE;
1da177e4
LT		 4023}
4024
1ab1457c 4025static void inet6_prefix_notify(int event, struct inet6_dev *idev,
1da177e4
LT		 4026 struct prefix_info *pinfo)
4027{
4028 struct sk_buff *skb;
c346dca1 4029 struct net *net = dev_net(idev->dev);
8c384bfa 4030 int err = -ENOBUFS;
1da177e4 4031
339bf98f 4032 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
8c384bfa
TG		 4033 if (skb == NULL)
4034 goto errout;
4035
4036 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
26932566
PM		 4037 if (err < 0) {
4038 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
4039 WARN_ON(err == -EMSGSIZE);
4040 kfree_skb(skb);
4041 goto errout;
4042 }
1ce85fe4
PNA		 4043 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
4044 return;
8c384bfa
TG		 4045errout:
4046 if (err < 0)
6fda7350 4047 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
1da177e4
LT		 4048}
4049
1da177e4
LT		 4050static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4051{
4052 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
4053
4054 switch (event) {
4055 case RTM_NEWADDR:
95c385b4
NH		 4056 /*
4057 * If the address was optimistic
4058 * we inserted the route at the start of
4059 * our DAD process, so we don't need
4060 * to do it again
4061 */
4062 if (!(ifp->rt->rt6i_node))
4063 ip6_ins_rt(ifp->rt);
1da177e4
LT		 4064 if (ifp->idev->cnf.forwarding)
4065 addrconf_join_anycast(ifp);
4066 break;
4067 case RTM_DELADDR:
4068 if (ifp->idev->cnf.forwarding)
4069 addrconf_leave_anycast(ifp);
4070 addrconf_leave_solict(ifp->idev, &ifp->addr);
4071 dst_hold(&ifp->rt->u.dst);
93fa159a 4072
e9d3e084
HX		 4073 if (ifp->state == INET6_IFADDR_STATE_DEAD &&
4074 ip6_del_rt(ifp->rt))
1da177e4 4075 dst_free(&ifp->rt->u.dst);
1da177e4
LT		 4076 break;
4077 }
4078}
4079
4080static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4081{
8814c4b5 4082 rcu_read_lock_bh();
1da177e4
LT		 4083 if (likely(ifp->idev->dead == 0))
4084 __ipv6_ifa_notify(event, ifp);
8814c4b5 4085 rcu_read_unlock_bh();
1da177e4
LT		 4086}
4087
4088#ifdef CONFIG_SYSCTL
4089
4090static
8d65af78 4091int addrconf_sysctl_forward(ctl_table *ctl, int write,
1da177e4
LT		 4092 void __user *buffer, size_t *lenp, loff_t *ppos)
4093{
4094 int *valp = ctl->data;
4095 int val = *valp;
88af182e 4096 loff_t pos = *ppos;
1da177e4
LT		 4097 int ret;
4098
8d65af78 4099 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
1da177e4 4100
c8fecf22 4101 if (write)
b325fddb 4102 ret = addrconf_fixup_forwarding(ctl, valp, val);
88af182e
EB		 4103 if (ret)
4104 *ppos = pos;
1ab1457c 4105 return ret;
1da177e4
LT		 4106}
4107
56d417b1
BH		 4108static void dev_disable_change(struct inet6_dev *idev)
4109{
4110 if (!idev || !idev->dev)
4111 return;
4112
4113 if (idev->cnf.disable_ipv6)
4114 addrconf_notify(NULL, NETDEV_DOWN, idev->dev);
4115 else
4116 addrconf_notify(NULL, NETDEV_UP, idev->dev);
4117}
4118
4119static void addrconf_disable_change(struct net *net, __s32 newf)
4120{
4121 struct net_device *dev;
4122 struct inet6_dev *idev;
4123
c6d14c84
ED		 4124 rcu_read_lock();
4125 for_each_netdev_rcu(net, dev) {
56d417b1
BH		 4126 idev = __in6_dev_get(dev);
4127 if (idev) {
4128 int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
4129 idev->cnf.disable_ipv6 = newf;
4130 if (changed)
4131 dev_disable_change(idev);
4132 }
56d417b1 4133 }
c6d14c84 4134 rcu_read_unlock();
56d417b1
BH		 4135}
4136
4137static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int old)
4138{
4139 struct net *net;
4140
4141 net = (struct net *)table->extra2;
4142
4143 if (p == &net->ipv6.devconf_dflt->disable_ipv6)
4144 return 0;
4145
88af182e
EB		 4146 if (!rtnl_trylock()) {
4147 /* Restore the original values before restarting */
4148 *p = old;
56d417b1 4149 return restart_syscall();
88af182e 4150 }
56d417b1
BH		 4151
4152 if (p == &net->ipv6.devconf_all->disable_ipv6) {
4153 __s32 newf = net->ipv6.devconf_all->disable_ipv6;
4154 net->ipv6.devconf_dflt->disable_ipv6 = newf;
4155 addrconf_disable_change(net, newf);
4156 } else if ((!*p) ^ (!old))
4157 dev_disable_change((struct inet6_dev *)table->extra1);
4158
4159 rtnl_unlock();
4160 return 0;
4161}
4162
4163static
8d65af78 4164int addrconf_sysctl_disable(ctl_table *ctl, int write,
56d417b1
BH		 4165 void __user *buffer, size_t *lenp, loff_t *ppos)
4166{
4167 int *valp = ctl->data;
4168 int val = *valp;
88af182e 4169 loff_t pos = *ppos;
56d417b1
BH		 4170 int ret;
4171
8d65af78 4172 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
56d417b1
BH		 4173
4174 if (write)
4175 ret = addrconf_disable_ipv6(ctl, valp, val);
88af182e
EB		 4176 if (ret)
4177 *ppos = pos;
56d417b1
BH		 4178 return ret;
4179}
4180
1da177e4
LT		 4181static struct addrconf_sysctl_table
4182{
4183 struct ctl_table_header *sysctl_header;
f6a07b29 4184 ctl_table addrconf_vars[DEVCONF_MAX+1];
1dab6222 4185 char *dev_name;
ab32ea5d 4186} addrconf_sysctl __read_mostly = {
1da177e4
LT		 4187 .sysctl_header = NULL,
4188 .addrconf_vars = {
1ab1457c 4189 {
e21e8467
SH		 4190 .procname = "forwarding",
4191 .data = &ipv6_devconf.forwarding,
4192 .maxlen = sizeof(int),
4193 .mode = 0644,
4194 .proc_handler = addrconf_sysctl_forward,
1da177e4
LT		 4195 },
4196 {
e21e8467
SH		 4197 .procname = "hop_limit",
4198 .data = &ipv6_devconf.hop_limit,
4199 .maxlen = sizeof(int),
4200 .mode = 0644,
4201 .proc_handler = proc_dointvec,
1da177e4
LT		 4202 },
4203 {
e21e8467
SH		 4204 .procname = "mtu",
4205 .data = &ipv6_devconf.mtu6,
4206 .maxlen = sizeof(int),
4207 .mode = 0644,
4208 .proc_handler = proc_dointvec,
1da177e4
LT		 4209 },
4210 {
e21e8467
SH		 4211 .procname = "accept_ra",
4212 .data = &ipv6_devconf.accept_ra,
4213 .maxlen = sizeof(int),
4214 .mode = 0644,
4215 .proc_handler = proc_dointvec,
1da177e4
LT		 4216 },
4217 {
e21e8467
SH		 4218 .procname = "accept_redirects",
4219 .data = &ipv6_devconf.accept_redirects,
4220 .maxlen = sizeof(int),
4221 .mode = 0644,
4222 .proc_handler = proc_dointvec,
1da177e4
LT		 4223 },
4224 {
e21e8467
SH		 4225 .procname = "autoconf",
4226 .data = &ipv6_devconf.autoconf,
4227 .maxlen = sizeof(int),
4228 .mode = 0644,
4229 .proc_handler = proc_dointvec,
1da177e4
LT		 4230 },
4231 {
e21e8467
SH		 4232 .procname = "dad_transmits",
4233 .data = &ipv6_devconf.dad_transmits,
4234 .maxlen = sizeof(int),
4235 .mode = 0644,
4236 .proc_handler = proc_dointvec,
1da177e4
LT		 4237 },
4238 {
e21e8467
SH		 4239 .procname = "router_solicitations",
4240 .data = &ipv6_devconf.rtr_solicits,
4241 .maxlen = sizeof(int),
4242 .mode = 0644,
4243 .proc_handler = proc_dointvec,
1da177e4
LT		 4244 },
4245 {
e21e8467
SH		 4246 .procname = "router_solicitation_interval",
4247 .data = &ipv6_devconf.rtr_solicit_interval,
4248 .maxlen = sizeof(int),
4249 .mode = 0644,
4250 .proc_handler = proc_dointvec_jiffies,
1da177e4
LT		 4251 },
4252 {
e21e8467
SH		 4253 .procname = "router_solicitation_delay",
4254 .data = &ipv6_devconf.rtr_solicit_delay,
4255 .maxlen = sizeof(int),
4256 .mode = 0644,
4257 .proc_handler = proc_dointvec_jiffies,
1da177e4
LT		 4258 },
4259 {
e21e8467
SH		 4260 .procname = "force_mld_version",
4261 .data = &ipv6_devconf.force_mld_version,
4262 .maxlen = sizeof(int),
4263 .mode = 0644,
4264 .proc_handler = proc_dointvec,
1da177e4
LT		 4265 },
4266#ifdef CONFIG_IPV6_PRIVACY
4267 {
e21e8467
SH		 4268 .procname = "use_tempaddr",
4269 .data = &ipv6_devconf.use_tempaddr,
4270 .maxlen = sizeof(int),
4271 .mode = 0644,
4272 .proc_handler = proc_dointvec,
1da177e4
LT		 4273 },
4274 {
e21e8467
SH		 4275 .procname = "temp_valid_lft",
4276 .data = &ipv6_devconf.temp_valid_lft,
4277 .maxlen = sizeof(int),
4278 .mode = 0644,
4279 .proc_handler = proc_dointvec,
1da177e4
LT		 4280 },
4281 {
e21e8467
SH		 4282 .procname = "temp_prefered_lft",
4283 .data = &ipv6_devconf.temp_prefered_lft,
4284 .maxlen = sizeof(int),
4285 .mode = 0644,
4286 .proc_handler = proc_dointvec,
1da177e4
LT		 4287 },
4288 {
e21e8467
SH		 4289 .procname = "regen_max_retry",
4290 .data = &ipv6_devconf.regen_max_retry,
4291 .maxlen = sizeof(int),
4292 .mode = 0644,
4293 .proc_handler = proc_dointvec,
1da177e4
LT		 4294 },
4295 {
e21e8467
SH		 4296 .procname = "max_desync_factor",
4297 .data = &ipv6_devconf.max_desync_factor,
4298 .maxlen = sizeof(int),
4299 .mode = 0644,
4300 .proc_handler = proc_dointvec,
1da177e4
LT		 4301 },
4302#endif
4303 {
e21e8467
SH		 4304 .procname = "max_addresses",
4305 .data = &ipv6_devconf.max_addresses,
4306 .maxlen = sizeof(int),
4307 .mode = 0644,
4308 .proc_handler = proc_dointvec,
1da177e4 4309 },
65f5c7c1 4310 {
e21e8467
SH		 4311 .procname = "accept_ra_defrtr",
4312 .data = &ipv6_devconf.accept_ra_defrtr,
4313 .maxlen = sizeof(int),
4314 .mode = 0644,
4315 .proc_handler = proc_dointvec,
65f5c7c1 4316 },
c4fd30eb 4317 {
e21e8467
SH		 4318 .procname = "accept_ra_pinfo",
4319 .data = &ipv6_devconf.accept_ra_pinfo,
4320 .maxlen = sizeof(int),
4321 .mode = 0644,
4322 .proc_handler = proc_dointvec,
c4fd30eb 4323 },
930d6ff2
YH		 4324#ifdef CONFIG_IPV6_ROUTER_PREF
4325 {
e21e8467
SH		 4326 .procname = "accept_ra_rtr_pref",
4327 .data = &ipv6_devconf.accept_ra_rtr_pref,
4328 .maxlen = sizeof(int),
4329 .mode = 0644,
4330 .proc_handler = proc_dointvec,
930d6ff2 4331 },
52e16356 4332 {
e21e8467
SH		 4333 .procname = "router_probe_interval",
4334 .data = &ipv6_devconf.rtr_probe_interval,
4335 .maxlen = sizeof(int),
4336 .mode = 0644,
4337 .proc_handler = proc_dointvec_jiffies,
52e16356 4338 },
fa03ef38 4339#ifdef CONFIG_IPV6_ROUTE_INFO
09c884d4 4340 {
e21e8467
SH		 4341 .procname = "accept_ra_rt_info_max_plen",
4342 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
4343 .maxlen = sizeof(int),
4344 .mode = 0644,
4345 .proc_handler = proc_dointvec,
09c884d4
YH		 4346 },
4347#endif
930d6ff2 4348#endif
fbea49e1 4349 {
e21e8467
SH		 4350 .procname = "proxy_ndp",
4351 .data = &ipv6_devconf.proxy_ndp,
4352 .maxlen = sizeof(int),
4353 .mode = 0644,
4354 .proc_handler = proc_dointvec,
fbea49e1 4355 },
0bcbc926 4356 {
e21e8467
SH		 4357 .procname = "accept_source_route",
4358 .data = &ipv6_devconf.accept_source_route,
4359 .maxlen = sizeof(int),
4360 .mode = 0644,
4361 .proc_handler = proc_dointvec,
0bcbc926 4362 },
95c385b4
NH		 4363#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4364 {
e21e8467
SH		 4365 .procname = "optimistic_dad",
4366 .data = &ipv6_devconf.optimistic_dad,
4367 .maxlen = sizeof(int),
4368 .mode = 0644,
4369 .proc_handler = proc_dointvec,
95c385b4
NH		 4370
4371 },
7bc570c8
YH		 4372#endif
4373#ifdef CONFIG_IPV6_MROUTE
4374 {
e21e8467
SH		 4375 .procname = "mc_forwarding",
4376 .data = &ipv6_devconf.mc_forwarding,
4377 .maxlen = sizeof(int),
4378 .mode = 0444,
4379 .proc_handler = proc_dointvec,
7bc570c8 4380 },
95c385b4 4381#endif
778d80be 4382 {
e21e8467
SH		 4383 .procname = "disable_ipv6",
4384 .data = &ipv6_devconf.disable_ipv6,
4385 .maxlen = sizeof(int),
4386 .mode = 0644,
4387 .proc_handler = addrconf_sysctl_disable,
778d80be 4388 },
1b34be74 4389 {
e21e8467
SH		 4390 .procname = "accept_dad",
4391 .data = &ipv6_devconf.accept_dad,
4392 .maxlen = sizeof(int),
4393 .mode = 0644,
4394 .proc_handler = proc_dointvec,
1b34be74 4395 },
f7734fdf 4396 {
f7734fdf
OP		 4397 .procname = "force_tllao",
4398 .data = &ipv6_devconf.force_tllao,
4399 .maxlen = sizeof(int),
4400 .mode = 0644,
4401 .proc_handler = proc_dointvec
4402 },
1da177e4 4403 {
f8572d8f 4404 /* sentinel */
1da177e4
LT		 4405 }
4406 },
1da177e4
LT		 4407};
4408
bff16c2f 4409static int __addrconf_sysctl_register(struct net *net, char *dev_name,
f8572d8f 4410 struct inet6_dev *idev, struct ipv6_devconf *p)
1da177e4
LT		 4411{
4412 int i;
1da177e4 4413 struct addrconf_sysctl_table *t;
1da177e4 4414
1dab6222
PE		 4415#define ADDRCONF_CTL_PATH_DEV 3
4416
4417 struct ctl_path addrconf_ctl_path[] = {
f8572d8f
EB		 4418 { .procname = "net", },
4419 { .procname = "ipv6", },
4420 { .procname = "conf", },
1dab6222
PE		 4421 { /* to be set */ },
4422 { },
4423 };
4424
4425
af879cc7 4426 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
1da177e4 4427 if (t == NULL)
f68635e6
PE		 4428 goto out;
4429
bcdd553f 4430 for (i = 0; t->addrconf_vars[i].data; i++) {
e21e8467 4431 t->addrconf_vars[i].data += (char *)p - (char *)&ipv6_devconf;
1da177e4 4432 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
bff16c2f 4433 t->addrconf_vars[i].extra2 = net;
1da177e4 4434 }
1da177e4 4435
1ab1457c
YH		 4436 /*
4437 * Make a copy of dev_name, because '.procname' is regarded as const
1da177e4
LT		 4438 * by sysctl and we wouldn't want anyone to change it under our feet
4439 * (see SIOCSIFNAME).
1ab1457c 4440 */
1dab6222
PE		 4441 t->dev_name = kstrdup(dev_name, GFP_KERNEL);
4442 if (!t->dev_name)
f68635e6 4443 goto free;
1da177e4 4444
1dab6222 4445 addrconf_ctl_path[ADDRCONF_CTL_PATH_DEV].procname = t->dev_name;
1da177e4 4446
bff16c2f 4447 t->sysctl_header = register_net_sysctl_table(net, addrconf_ctl_path,
1dab6222 4448 t->addrconf_vars);
1da177e4
LT		 4449 if (t->sysctl_header == NULL)
4450 goto free_procname;
f68635e6
PE		 4451
4452 p->sysctl = t;
95897312 4453 return 0;
1da177e4 4454
f68635e6 4455free_procname:
1dab6222 4456 kfree(t->dev_name);
f68635e6 4457free:
1da177e4 4458 kfree(t);
f68635e6 4459out:
95897312 4460 return -ENOBUFS;
1da177e4
LT		 4461}
4462
408c4768
PE		 4463static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
4464{
4465 struct addrconf_sysctl_table *t;
4466
4467 if (p->sysctl == NULL)
4468 return;
4469
4470 t = p->sysctl;
4471 p->sysctl = NULL;
4472 unregister_sysctl_table(t->sysctl_header);
4473 kfree(t->dev_name);
4474 kfree(t);
4475}
4476
f52295a9
PE		 4477static void addrconf_sysctl_register(struct inet6_dev *idev)
4478{
54716e3b 4479 neigh_sysctl_register(idev->dev, idev->nd_parms, "ipv6",
f8572d8f 4480 &ndisc_ifinfo_sysctl_change);
c346dca1 4481 __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
f8572d8f 4482 idev, &idev->cnf);
f52295a9
PE		 4483}
4484
408c4768 4485static void addrconf_sysctl_unregister(struct inet6_dev *idev)
1da177e4 4486{
408c4768
PE		 4487 __addrconf_sysctl_unregister(&idev->cnf);
4488 neigh_sysctl_unregister(idev->nd_parms);
1da177e4
LT		 4489}
4490
4491
4492#endif
4493
2c8c1e72 4494static int __net_init addrconf_init_net(struct net *net)
e0da5a48
PE		 4495{
4496 int err;
4497 struct ipv6_devconf *all, *dflt;
4498
4499 err = -ENOMEM;
4500 all = &ipv6_devconf;
4501 dflt = &ipv6_devconf_dflt;
4502
09ad9bc7 4503 if (!net_eq(net, &init_net)) {
e0da5a48
PE		 4504 all = kmemdup(all, sizeof(ipv6_devconf), GFP_KERNEL);
4505 if (all == NULL)
4506 goto err_alloc_all;
4507
4508 dflt = kmemdup(dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
4509 if (dflt == NULL)
4510 goto err_alloc_dflt;
56d417b1
BH		 4511 } else {
4512 /* these will be inherited by all namespaces */
4513 dflt->autoconf = ipv6_defaults.autoconf;
4514 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
e0da5a48
PE		 4515 }
4516
4517 net->ipv6.devconf_all = all;
4518 net->ipv6.devconf_dflt = dflt;
4519
4520#ifdef CONFIG_SYSCTL
f8572d8f 4521 err = __addrconf_sysctl_register(net, "all", NULL, all);
e0da5a48
PE		 4522 if (err < 0)
4523 goto err_reg_all;
4524
f8572d8f 4525 err = __addrconf_sysctl_register(net, "default", NULL, dflt);
e0da5a48
PE		 4526 if (err < 0)
4527 goto err_reg_dflt;
4528#endif
4529 return 0;
4530
4531#ifdef CONFIG_SYSCTL
4532err_reg_dflt:
4533 __addrconf_sysctl_unregister(all);
4534err_reg_all:
4535 kfree(dflt);
4536#endif
4537err_alloc_dflt:
4538 kfree(all);
4539err_alloc_all:
4540 return err;
4541}
4542
2c8c1e72 4543static void __net_exit addrconf_exit_net(struct net *net)
e0da5a48
PE		 4544{
4545#ifdef CONFIG_SYSCTL
4546 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
4547 __addrconf_sysctl_unregister(net->ipv6.devconf_all);
4548#endif
09ad9bc7 4549 if (!net_eq(net, &init_net)) {
e0da5a48
PE		 4550 kfree(net->ipv6.devconf_dflt);
4551 kfree(net->ipv6.devconf_all);
4552 }
4553}
4554
4555static struct pernet_operations addrconf_ops = {
4556 .init = addrconf_init_net,
4557 .exit = addrconf_exit_net,
4558};
4559
1da177e4
LT		 4560/*
4561 * Device notifier
4562 */
4563
4564int register_inet6addr_notifier(struct notifier_block *nb)
4565{
1ab1457c 4566 return atomic_notifier_chain_register(&inet6addr_chain, nb);
1da177e4 4567}
7159039a
YH		 4568EXPORT_SYMBOL(register_inet6addr_notifier);
4569
1da177e4
LT		 4570int unregister_inet6addr_notifier(struct notifier_block *nb)
4571{
e21e8467 4572 return atomic_notifier_chain_unregister(&inet6addr_chain, nb);
1da177e4 4573}
7159039a
YH		 4574EXPORT_SYMBOL(unregister_inet6addr_notifier);
4575
1da177e4
LT		 4576/*
4577 * Init / cleanup code
4578 */
4579
4580int __init addrconf_init(void)
4581{
c2e21293 4582 int i, err;
2a8cc6c8 4583
e21e8467
SH		 4584 err = ipv6_addr_label_init();
4585 if (err < 0) {
4586 printk(KERN_CRIT "IPv6 Addrconf:"
4587 " cannot initialize default policy table: %d.\n", err);
2a8cc6c8
YH		 4588 return err;
4589 }
1da177e4 4590
e0da5a48
PE		 4591 register_pernet_subsys(&addrconf_ops);
4592
1da177e4
LT		 4593 /* The addrconf netdev notifier requires that loopback_dev
4594 * has it's ipv6 private information allocated and setup
4595 * before it can bring up and give link-local addresses
4596 * to other devices which are up.
4597 *
4598 * Unfortunately, loopback_dev is not necessarily the first
4599 * entry in the global dev_base list of net devices. In fact,
4600 * it is likely to be the very last entry on that list.
4601 * So this causes the notifier registry below to try and
4602 * give link-local addresses to all devices besides loopback_dev
4603 * first, then loopback_dev, which cases all the non-loopback_dev
4604 * devices to fail to get a link-local address.
4605 *
4606 * So, as a temporary fix, allocate the ipv6 structure for
4607 * loopback_dev first by hand.
4608 * Longer term, all of the dependencies ipv6 has upon the loopback
4609 * device and it being up should be removed.
4610 */
4611 rtnl_lock();
2774c7ab 4612 if (!ipv6_add_dev(init_net.loopback_dev))
1da177e4
LT		 4613 err = -ENOMEM;
4614 rtnl_unlock();
4615 if (err)
e0da5a48 4616 goto errlo;
1da177e4 4617
c2e21293 4618 for (i = 0; i < IN6_ADDR_HSIZE; i++)
4619 INIT_HLIST_HEAD(&inet6_addr_lst[i]);
4620
1da177e4
LT		 4621 register_netdevice_notifier(&ipv6_dev_notf);
4622
1da177e4 4623 addrconf_verify(0);
c127ea2c
TG		 4624
4625 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo);
4626 if (err < 0)
4627 goto errout;
4628
4629 /* Only the first call to __rtnl_register can fail */
4630 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL);
4631 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL);
4632 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr, inet6_dump_ifaddr);
4633 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL, inet6_dump_ifmcaddr);
4634 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL, inet6_dump_ifacaddr);
4635
2a8cc6c8
YH		 4636 ipv6_addr_label_rtnl_register();
4637
1da177e4 4638 return 0;
c127ea2c
TG		 4639errout:
4640 unregister_netdevice_notifier(&ipv6_dev_notf);
e0da5a48
PE		 4641errlo:
4642 unregister_pernet_subsys(&addrconf_ops);
c127ea2c
TG		 4643
4644 return err;
1da177e4
LT		 4645}
4646
09f7709f 4647void addrconf_cleanup(void)
1da177e4 4648{
176c39af 4649 struct net_device *dev;
1da177e4
LT		 4650 int i;
4651
4652 unregister_netdevice_notifier(&ipv6_dev_notf);
e0da5a48 4653 unregister_pernet_subsys(&addrconf_ops);
1da177e4
LT		 4654
4655 rtnl_lock();
4656
176c39af
DL		 4657 /* clean dev list */
4658 for_each_netdev(&init_net, dev) {
4659 if (__in6_dev_get(dev) == NULL)
4660 continue;
4661 addrconf_ifdown(dev, 1);
4662 }
4663 addrconf_ifdown(init_net.loopback_dev, 2);
4664
1da177e4
LT		 4665 /*
4666 * Check hash table.
4667 */
5c578aed 4668 spin_lock_bh(&addrconf_hash_lock);
c2e21293 4669 for (i = 0; i < IN6_ADDR_HSIZE; i++)
4670 WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
5c578aed 4671 spin_unlock_bh(&addrconf_hash_lock);
1da177e4
LT		 4672
4673 del_timer(&addr_chk_timer);
1da177e4 4674 rtnl_unlock();
1da177e4 4675}
Clone of davem's net-next-2.6 tree