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net/smsc911x: add device tree probe support
[GitHub/mt8127/android_kernel_alcatel_ttab.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
18a31e1e
TG		 101
102static inline u32 cstamp_delta(unsigned long cstamp)
103{
104 return (cstamp - INITIAL_JIFFIES) * 100UL / HZ;
105}
1da177e4 106
b2db7564
YH		 107#define ADDRCONF_TIMER_FUZZ_MINUS (HZ > 50 ? HZ/50 : 1)
108#define ADDRCONF_TIMER_FUZZ (HZ / 4)
109#define ADDRCONF_TIMER_FUZZ_MAX (HZ)
110
1da177e4 111#ifdef CONFIG_SYSCTL
f52295a9 112static void addrconf_sysctl_register(struct inet6_dev *idev);
408c4768
PE		 113static void addrconf_sysctl_unregister(struct inet6_dev *idev);
114#else
115static inline void addrconf_sysctl_register(struct inet6_dev *idev)
116{
117}
118
119static inline void addrconf_sysctl_unregister(struct inet6_dev *idev)
120{
121}
1da177e4
LT		 122#endif
123
124#ifdef CONFIG_IPV6_PRIVACY
125static int __ipv6_regen_rndid(struct inet6_dev *idev);
1ab1457c 126static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
1da177e4 127static void ipv6_regen_rndid(unsigned long data);
1da177e4
LT		 128#endif
129
1b34be74 130static int ipv6_generate_eui64(u8 *eui, struct net_device *dev);
1da177e4
LT		 131static int ipv6_count_addresses(struct inet6_dev *idev);
132
133/*
134 * Configured unicast address hash table
135 */
c2e21293 136static struct hlist_head inet6_addr_lst[IN6_ADDR_HSIZE];
5c578aed 137static DEFINE_SPINLOCK(addrconf_hash_lock);
1da177e4 138
1da177e4
LT		 139static void addrconf_verify(unsigned long);
140
8d06afab 141static DEFINE_TIMER(addr_chk_timer, addrconf_verify, 0, 0);
1da177e4
LT		 142static DEFINE_SPINLOCK(addrconf_verify_lock);
143
144static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
145static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
146
93d9b7d7
JP		 147static void addrconf_type_change(struct net_device *dev,
148 unsigned long event);
1da177e4
LT		 149static int addrconf_ifdown(struct net_device *dev, int how);
150
e431b8c0 151static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags);
1da177e4
LT		 152static void addrconf_dad_timer(unsigned long data);
153static void addrconf_dad_completed(struct inet6_ifaddr *ifp);
c5e33bdd 154static void addrconf_dad_run(struct inet6_dev *idev);
1da177e4
LT		 155static void addrconf_rs_timer(unsigned long data);
156static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
157static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
158
1ab1457c 159static void inet6_prefix_notify(int event, struct inet6_dev *idev,
1da177e4 160 struct prefix_info *pinfo);
3e81c6da
DM		 161static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
162 struct net_device *dev);
1da177e4 163
e041c683 164static ATOMIC_NOTIFIER_HEAD(inet6addr_chain);
1da177e4 165
888c848e 166static struct ipv6_devconf ipv6_devconf __read_mostly = {
1da177e4
LT		 167 .forwarding = 0,
168 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
169 .mtu6 = IPV6_MIN_MTU,
170 .accept_ra = 1,
171 .accept_redirects = 1,
172 .autoconf = 1,
173 .force_mld_version = 0,
174 .dad_transmits = 1,
175 .rtr_solicits = MAX_RTR_SOLICITATIONS,
176 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
177 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
178#ifdef CONFIG_IPV6_PRIVACY
179 .use_tempaddr = 0,
180 .temp_valid_lft = TEMP_VALID_LIFETIME,
181 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
182 .regen_max_retry = REGEN_MAX_RETRY,
183 .max_desync_factor = MAX_DESYNC_FACTOR,
184#endif
185 .max_addresses = IPV6_MAX_ADDRESSES,
65f5c7c1 186 .accept_ra_defrtr = 1,
c4fd30eb 187 .accept_ra_pinfo = 1,
930d6ff2
YH		 188#ifdef CONFIG_IPV6_ROUTER_PREF
189 .accept_ra_rtr_pref = 1,
52e16356 190 .rtr_probe_interval = 60 * HZ,
09c884d4
YH		 191#ifdef CONFIG_IPV6_ROUTE_INFO
192 .accept_ra_rt_info_max_plen = 0,
193#endif
930d6ff2 194#endif
fbea49e1 195 .proxy_ndp = 0,
0bcbc926 196 .accept_source_route = 0, /* we do not accept RH0 by default. */
778d80be 197 .disable_ipv6 = 0,
1b34be74 198 .accept_dad = 1,
1da177e4
LT		 199};
200
ab32ea5d 201static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
1da177e4
LT		 202 .forwarding = 0,
203 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
204 .mtu6 = IPV6_MIN_MTU,
205 .accept_ra = 1,
206 .accept_redirects = 1,
207 .autoconf = 1,
208 .dad_transmits = 1,
209 .rtr_solicits = MAX_RTR_SOLICITATIONS,
210 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
211 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
212#ifdef CONFIG_IPV6_PRIVACY
213 .use_tempaddr = 0,
214 .temp_valid_lft = TEMP_VALID_LIFETIME,
215 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
216 .regen_max_retry = REGEN_MAX_RETRY,
217 .max_desync_factor = MAX_DESYNC_FACTOR,
218#endif
219 .max_addresses = IPV6_MAX_ADDRESSES,
65f5c7c1 220 .accept_ra_defrtr = 1,
c4fd30eb 221 .accept_ra_pinfo = 1,
930d6ff2
YH		 222#ifdef CONFIG_IPV6_ROUTER_PREF
223 .accept_ra_rtr_pref = 1,
52e16356 224 .rtr_probe_interval = 60 * HZ,
09c884d4
YH		 225#ifdef CONFIG_IPV6_ROUTE_INFO
226 .accept_ra_rt_info_max_plen = 0,
227#endif
930d6ff2 228#endif
fbea49e1 229 .proxy_ndp = 0,
0bcbc926 230 .accept_source_route = 0, /* we do not accept RH0 by default. */
778d80be 231 .disable_ipv6 = 0,
1b34be74 232 .accept_dad = 1,
1da177e4
LT		 233};
234
235/* IPv6 Wildcard Address and Loopback Address defined by RFC2553 */
1da177e4 236const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT;
1da177e4 237const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT;
f3ee4010
YH		 238const struct in6_addr in6addr_linklocal_allnodes = IN6ADDR_LINKLOCAL_ALLNODES_INIT;
239const struct in6_addr in6addr_linklocal_allrouters = IN6ADDR_LINKLOCAL_ALLROUTERS_INIT;
1da177e4 240
f24e3d65 241/* Check if a valid qdisc is available */
05297949 242static inline bool addrconf_qdisc_ok(const struct net_device *dev)
f24e3d65 243{
05297949 244 return !qdisc_tx_is_noop(dev);
f24e3d65
MC		 245}
246
2b5ead46
YH		 247/* Check if a route is valid prefix route */
248static inline int addrconf_is_prefix_route(const struct rt6_info *rt)
249{
a02cec21 250 return (rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0;
2b5ead46
YH		 251}
252
1da177e4
LT		 253static void addrconf_del_timer(struct inet6_ifaddr *ifp)
254{
255 if (del_timer(&ifp->timer))
256 __in6_ifa_put(ifp);
257}
258
e21e8467 259enum addrconf_timer_t {
1da177e4
LT		 260 AC_NONE,
261 AC_DAD,
262 AC_RS,
263};
264
265static void addrconf_mod_timer(struct inet6_ifaddr *ifp,
266 enum addrconf_timer_t what,
267 unsigned long when)
268{
269 if (!del_timer(&ifp->timer))
270 in6_ifa_hold(ifp);
271
272 switch (what) {
273 case AC_DAD:
274 ifp->timer.function = addrconf_dad_timer;
275 break;
276 case AC_RS:
277 ifp->timer.function = addrconf_rs_timer;
278 break;
e21e8467
SH		 279 default:
280 break;
1da177e4
LT		 281 }
282 ifp->timer.expires = jiffies + when;
283 add_timer(&ifp->timer);
284}
285
7f7d9a6b
HX		 286static int snmp6_alloc_dev(struct inet6_dev *idev)
287{
7d720c3e 288 if (snmp_mib_init((void __percpu **)idev->stats.ipv6,
1823e4c8
ED		 289 sizeof(struct ipstats_mib),
290 __alignof__(struct ipstats_mib)) < 0)
7f7d9a6b 291 goto err_ip;
be281e55
ED		 292 idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device),
293 GFP_KERNEL);
294 if (!idev->stats.icmpv6dev)
7f7d9a6b 295 goto err_icmp;
be281e55
ED		 296 idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device),
297 GFP_KERNEL);
298 if (!idev->stats.icmpv6msgdev)
14878f75 299 goto err_icmpmsg;
7f7d9a6b
HX		 300
301 return 0;
302
14878f75 303err_icmpmsg:
be281e55 304 kfree(idev->stats.icmpv6dev);
7f7d9a6b 305err_icmp:
7d720c3e 306 snmp_mib_free((void __percpu **)idev->stats.ipv6);
7f7d9a6b 307err_ip:
aaf70ec7 308 return -ENOMEM;
7f7d9a6b
HX		 309}
310
16910b98 311static void snmp6_free_dev(struct inet6_dev *idev)
7f7d9a6b 312{
be281e55
ED		 313 kfree(idev->stats.icmpv6msgdev);
314 kfree(idev->stats.icmpv6dev);
7d720c3e 315 snmp_mib_free((void __percpu **)idev->stats.ipv6);
7f7d9a6b
HX		 316}
317
1da177e4
LT		 318/* Nobody refers to this device, we may destroy it. */
319
320void in6_dev_finish_destroy(struct inet6_dev *idev)
321{
322 struct net_device *dev = idev->dev;
547b792c 323
502a2ffd 324 WARN_ON(!list_empty(&idev->addr_list));
547b792c
IJ		 325 WARN_ON(idev->mc_list != NULL);
326
1da177e4
LT		 327#ifdef NET_REFCNT_DEBUG
328 printk(KERN_DEBUG "in6_dev_finish_destroy: %s\n", dev ? dev->name : "NIL");
329#endif
330 dev_put(dev);
331 if (!idev->dead) {
e21e8467 332 pr_warning("Freeing alive inet6 device %p\n", idev);
1da177e4
LT		 333 return;
334 }
335 snmp6_free_dev(idev);
38f57d1a 336 kfree_rcu(idev, rcu);
1da177e4
LT		 337}
338
7159039a
YH		 339EXPORT_SYMBOL(in6_dev_finish_destroy);
340
1da177e4
LT		 341static struct inet6_dev * ipv6_add_dev(struct net_device *dev)
342{
343 struct inet6_dev *ndev;
344
345 ASSERT_RTNL();
346
347 if (dev->mtu < IPV6_MIN_MTU)
348 return NULL;
349
1ab1457c 350 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
322f74a4 351
1ab1457c
YH		 352 if (ndev == NULL)
353 return NULL;
322f74a4
IO		 354
355 rwlock_init(&ndev->lock);
356 ndev->dev = dev;
502a2ffd 357 INIT_LIST_HEAD(&ndev->addr_list);
358
c346dca1 359 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf));
322f74a4
IO		 360 ndev->cnf.mtu6 = dev->mtu;
361 ndev->cnf.sysctl = NULL;
362 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
363 if (ndev->nd_parms == NULL) {
364 kfree(ndev);
365 return NULL;
366 }
0187bdfb
BH		 367 if (ndev->cnf.forwarding)
368 dev_disable_lro(dev);
322f74a4
IO		 369 /* We refer to the device */
370 dev_hold(dev);
1da177e4 371
322f74a4
IO		 372 if (snmp6_alloc_dev(ndev) < 0) {
373 ADBG((KERN_WARNING
374 "%s(): cannot allocate memory for statistics; dev=%s.\n",
0dc47877 375 __func__, dev->name));
322f74a4
IO		 376 neigh_parms_release(&nd_tbl, ndev->nd_parms);
377 ndev->dead = 1;
378 in6_dev_finish_destroy(ndev);
379 return NULL;
380 }
1da177e4 381
322f74a4
IO		 382 if (snmp6_register_dev(ndev) < 0) {
383 ADBG((KERN_WARNING
384 "%s(): cannot create /proc/net/dev_snmp6/%s\n",
0dc47877 385 __func__, dev->name));
322f74a4
IO		 386 neigh_parms_release(&nd_tbl, ndev->nd_parms);
387 ndev->dead = 1;
388 in6_dev_finish_destroy(ndev);
389 return NULL;
390 }
391
392 /* One reference from device. We must do this before
393 * we invoke __ipv6_regen_rndid().
394 */
395 in6_dev_hold(ndev);
1da177e4 396
1b34be74
YH		 397 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
398 ndev->cnf.accept_dad = -1;
399
b077d7ab
YH		 400#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
401 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
402 printk(KERN_INFO
403 "%s: Disabled Multicast RS\n",
404 dev->name);
405 ndev->cnf.rtr_solicits = 0;
406 }
407#endif
408
1da177e4 409#ifdef CONFIG_IPV6_PRIVACY
372e6c8f 410 INIT_LIST_HEAD(&ndev->tempaddr_list);
b24b8a24 411 setup_timer(&ndev->regen_timer, ipv6_regen_rndid, (unsigned long)ndev);
322f74a4
IO		 412 if ((dev->flags&IFF_LOOPBACK) ||
413 dev->type == ARPHRD_TUNNEL ||
9625ed72 414 dev->type == ARPHRD_TUNNEL6 ||
0be669bb 415 dev->type == ARPHRD_SIT ||
0be669bb 416 dev->type == ARPHRD_NONE) {
322f74a4
IO		 417 ndev->cnf.use_tempaddr = -1;
418 } else {
419 in6_dev_hold(ndev);
420 ipv6_regen_rndid((unsigned long) ndev);
421 }
1da177e4
LT		 422#endif
423
f24e3d65 424 if (netif_running(dev) && addrconf_qdisc_ok(dev))
53aadcc9
HX		 425 ndev->if_flags |= IF_READY;
426
322f74a4
IO		 427 ipv6_mc_init_dev(ndev);
428 ndev->tstamp = jiffies;
f52295a9 429 addrconf_sysctl_register(ndev);
30c4cf57
DS		 430 /* protected by rtnl_lock */
431 rcu_assign_pointer(dev->ip6_ptr, ndev);
d88ae4cc
YH		 432
433 /* Join all-node multicast group */
f3ee4010 434 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);
d88ae4cc 435
1da177e4
LT		 436 return ndev;
437}
438
cee89473 439static struct inet6_dev * ipv6_find_idev(struct net_device *dev)
1da177e4
LT		 440{
441 struct inet6_dev *idev;
442
443 ASSERT_RTNL();
444
e21e8467
SH		 445 idev = __in6_dev_get(dev);
446 if (!idev) {
447 idev = ipv6_add_dev(dev);
448 if (!idev)
1da177e4
LT		 449 return NULL;
450 }
c5e33bdd 451
1da177e4
LT		 452 if (dev->flags&IFF_UP)
453 ipv6_mc_up(idev);
454 return idev;
455}
456
457#ifdef CONFIG_SYSCTL
458static void dev_forward_change(struct inet6_dev *idev)
459{
460 struct net_device *dev;
461 struct inet6_ifaddr *ifa;
1da177e4
LT		 462
463 if (!idev)
464 return;
465 dev = idev->dev;
0187bdfb
BH		 466 if (idev->cnf.forwarding)
467 dev_disable_lro(dev);
1da177e4 468 if (dev && (dev->flags & IFF_MULTICAST)) {
1da177e4 469 if (idev->cnf.forwarding)
f3ee4010 470 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
1da177e4 471 else
f3ee4010 472 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
1da177e4 473 }
502a2ffd 474
475 list_for_each_entry(ifa, &idev->addr_list, if_list) {
2c12a74c
MW		 476 if (ifa->flags&IFA_F_TENTATIVE)
477 continue;
1da177e4
LT		 478 if (idev->cnf.forwarding)
479 addrconf_join_anycast(ifa);
480 else
481 addrconf_leave_anycast(ifa);
482 }
483}
484
485
e186932b 486static void addrconf_forward_change(struct net *net, __s32 newf)
1da177e4
LT		 487{
488 struct net_device *dev;
489 struct inet6_dev *idev;
490
c6d14c84
ED		 491 rcu_read_lock();
492 for_each_netdev_rcu(net, dev) {
1da177e4
LT		 493 idev = __in6_dev_get(dev);
494 if (idev) {
e186932b
PE		 495 int changed = (!idev->cnf.forwarding) ^ (!newf);
496 idev->cnf.forwarding = newf;
1da177e4
LT		 497 if (changed)
498 dev_forward_change(idev);
499 }
1da177e4 500 }
c6d14c84 501 rcu_read_unlock();
1da177e4 502}
c8fecf22 503
b325fddb 504static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int old)
c8fecf22 505{
bff16c2f
PE		 506 struct net *net;
507
508 net = (struct net *)table->extra2;
441fc2a2 509 if (p == &net->ipv6.devconf_dflt->forwarding)
b325fddb
SH		 510 return 0;
511
88af182e
EB		 512 if (!rtnl_trylock()) {
513 /* Restore the original values before restarting */
514 *p = old;
5007392d 515 return restart_syscall();
88af182e 516 }
c8fecf22 517
e186932b
PE		 518 if (p == &net->ipv6.devconf_all->forwarding) {
519 __s32 newf = net->ipv6.devconf_all->forwarding;
520 net->ipv6.devconf_dflt->forwarding = newf;
521 addrconf_forward_change(net, newf);
c8fecf22
PE		 522 } else if ((!*p) ^ (!old))
523 dev_forward_change((struct inet6_dev *)table->extra1);
0187bdfb 524 rtnl_unlock();
c8fecf22
PE		 525
526 if (*p)
7b4da532 527 rt6_purge_dflt_routers(net);
b325fddb 528 return 1;
c8fecf22 529}
1da177e4
LT		 530#endif
531
5c578aed 532/* Nobody refers to this ifaddr, destroy it */
1da177e4
LT		 533void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
534{
c2e21293 535 WARN_ON(!hlist_unhashed(&ifp->addr_lst));
547b792c 536
1da177e4
LT		 537#ifdef NET_REFCNT_DEBUG
538 printk(KERN_DEBUG "inet6_ifa_finish_destroy\n");
539#endif
540
541 in6_dev_put(ifp->idev);
542
543 if (del_timer(&ifp->timer))
e21e8467 544 pr_notice("Timer is still running, when freeing ifa=%p\n", ifp);
1da177e4 545
e9d3e084 546 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
e21e8467 547 pr_warning("Freeing alive inet6 address %p\n", ifp);
1da177e4
LT		 548 return;
549 }
d8d1f30b 550 dst_release(&ifp->rt->dst);
1da177e4 551
e5785985 552 kfree_rcu(ifp, rcu);
1da177e4
LT		 553}
554
e55ffac6
BH		 555static void
556ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
557{
502a2ffd 558 struct list_head *p;
8a6ce0c0 559 int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
e55ffac6
BH		 560
561 /*
562 * Each device address list is sorted in order of scope -
563 * global before linklocal.
564 */
502a2ffd 565 list_for_each(p, &idev->addr_list) {
566 struct inet6_ifaddr *ifa
567 = list_entry(p, struct inet6_ifaddr, if_list);
8a6ce0c0 568 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
e55ffac6
BH		 569 break;
570 }
571
b54c9b98 572 list_add_tail(&ifp->if_list, p);
e55ffac6
BH		 573}
574
3a88a81d 575static u32 ipv6_addr_hash(const struct in6_addr *addr)
3eb84f49 576{
3eb84f49
YH		 577 /*
578 * We perform the hash function over the last 64 bits of the address
579 * This will include the IEEE address token on links that support it.
580 */
0eae88f3
ED		 581 return jhash_2words((__force u32)addr->s6_addr32[2],
582 (__force u32)addr->s6_addr32[3], 0)
3a88a81d 583 & (IN6_ADDR_HSIZE - 1);
3eb84f49
YH		 584}
585
1da177e4
LT		 586/* On success it returns ifp with increased reference count */
587
588static struct inet6_ifaddr *
589ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, int pfxlen,
e431b8c0 590 int scope, u32 flags)
1da177e4
LT		 591{
592 struct inet6_ifaddr *ifa = NULL;
593 struct rt6_info *rt;
3a88a81d 594 unsigned int hash;
1da177e4 595 int err = 0;
d68b8270
YH		 596 int addr_type = ipv6_addr_type(addr);
597
598 if (addr_type == IPV6_ADDR_ANY ||
599 addr_type & IPV6_ADDR_MULTICAST ||
600 (!(idev->dev->flags & IFF_LOOPBACK) &&
601 addr_type & IPV6_ADDR_LOOPBACK))
602 return ERR_PTR(-EADDRNOTAVAIL);
1da177e4 603
8814c4b5 604 rcu_read_lock_bh();
1da177e4
LT		 605 if (idev->dead) {
606 err = -ENODEV; /*XXX*/
607 goto out2;
608 }
609
56d417b1 610 if (idev->cnf.disable_ipv6) {
9bdd8d40
BH		 611 err = -EACCES;
612 goto out2;
613 }
614
5c578aed 615 spin_lock(&addrconf_hash_lock);
1da177e4
LT		 616
617 /* Ignore adding duplicate addresses on an interface */
c346dca1 618 if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) {
1da177e4
LT		 619 ADBG(("ipv6_add_addr: already assigned\n"));
620 err = -EEXIST;
621 goto out;
622 }
623
322f74a4 624 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
1da177e4
LT		 625
626 if (ifa == NULL) {
627 ADBG(("ipv6_add_addr: malloc failed\n"));
628 err = -ENOBUFS;
629 goto out;
630 }
631
632 rt = addrconf_dst_alloc(idev, addr, 0);
633 if (IS_ERR(rt)) {
634 err = PTR_ERR(rt);
635 goto out;
636 }
637
1da177e4
LT		 638 ipv6_addr_copy(&ifa->addr, addr);
639
640 spin_lock_init(&ifa->lock);
e9d3e084 641 spin_lock_init(&ifa->state_lock);
1da177e4 642 init_timer(&ifa->timer);
c2e21293 643 INIT_HLIST_NODE(&ifa->addr_lst);
1da177e4
LT		 644 ifa->timer.data = (unsigned long) ifa;
645 ifa->scope = scope;
646 ifa->prefix_len = pfxlen;
647 ifa->flags = flags | IFA_F_TENTATIVE;
648 ifa->cstamp = ifa->tstamp = jiffies;
649
57f5f544
KF		 650 ifa->rt = rt;
651
95c385b4
NH		 652 /*
653 * part one of RFC 4429, section 3.3
654 * We should not configure an address as
655 * optimistic if we do not yet know the link
656 * layer address of our nexhop router
657 */
658
69cce1d1 659 if (dst_get_neighbour(&rt->dst) == NULL)
95c385b4
NH		 660 ifa->flags &= ~IFA_F_OPTIMISTIC;
661
1da177e4
LT		 662 ifa->idev = idev;
663 in6_dev_hold(idev);
664 /* For caller */
665 in6_ifa_hold(ifa);
666
667 /* Add to big hash table */
668 hash = ipv6_addr_hash(addr);
669
5c578aed 670 hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]);
5c578aed 671 spin_unlock(&addrconf_hash_lock);
1da177e4
LT		 672
673 write_lock(&idev->lock);
674 /* Add to inet6_dev unicast addr list. */
e55ffac6 675 ipv6_link_dev_addr(idev, ifa);
1da177e4
LT		 676
677#ifdef CONFIG_IPV6_PRIVACY
678 if (ifa->flags&IFA_F_TEMPORARY) {
372e6c8f 679 list_add(&ifa->tmp_list, &idev->tempaddr_list);
1da177e4
LT		 680 in6_ifa_hold(ifa);
681 }
682#endif
683
1da177e4
LT		 684 in6_ifa_hold(ifa);
685 write_unlock(&idev->lock);
686out2:
8814c4b5 687 rcu_read_unlock_bh();
1da177e4 688
fd92833a 689 if (likely(err == 0))
e041c683 690 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_UP, ifa);
1da177e4
LT		 691 else {
692 kfree(ifa);
693 ifa = ERR_PTR(err);
694 }
695
696 return ifa;
697out:
5c578aed 698 spin_unlock(&addrconf_hash_lock);
1da177e4
LT		 699 goto out2;
700}
701
702/* This function wants to get referenced ifp and releases it before return */
703
704static void ipv6_del_addr(struct inet6_ifaddr *ifp)
705{
502a2ffd 706 struct inet6_ifaddr *ifa, *ifn;
1da177e4 707 struct inet6_dev *idev = ifp->idev;
4c5ff6a6 708 int state;
1da177e4
LT		 709 int deleted = 0, onlink = 0;
710 unsigned long expires = jiffies;
711
4c5ff6a6
HX		 712 spin_lock_bh(&ifp->state_lock);
713 state = ifp->state;
e9d3e084 714 ifp->state = INET6_IFADDR_STATE_DEAD;
4c5ff6a6
HX		 715 spin_unlock_bh(&ifp->state_lock);
716
717 if (state == INET6_IFADDR_STATE_DEAD)
718 goto out;
1da177e4 719
5c578aed 720 spin_lock_bh(&addrconf_hash_lock);
721 hlist_del_init_rcu(&ifp->addr_lst);
5c578aed 722 spin_unlock_bh(&addrconf_hash_lock);
1da177e4
LT		 723
724 write_lock_bh(&idev->lock);
725#ifdef CONFIG_IPV6_PRIVACY
726 if (ifp->flags&IFA_F_TEMPORARY) {
372e6c8f 727 list_del(&ifp->tmp_list);
728 if (ifp->ifpub) {
729 in6_ifa_put(ifp->ifpub);
730 ifp->ifpub = NULL;
1da177e4 731 }
372e6c8f 732 __in6_ifa_put(ifp);
1da177e4
LT		 733 }
734#endif
735
502a2ffd 736 list_for_each_entry_safe(ifa, ifn, &idev->addr_list, if_list) {
1da177e4 737 if (ifa == ifp) {
502a2ffd 738 list_del_init(&ifp->if_list);
1da177e4 739 __in6_ifa_put(ifp);
502a2ffd 740
1da177e4
LT		 741 if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0)
742 break;
743 deleted = 1;
1d142804 744 continue;
1da177e4
LT		 745 } else if (ifp->flags & IFA_F_PERMANENT) {
746 if (ipv6_prefix_equal(&ifa->addr, &ifp->addr,
747 ifp->prefix_len)) {
748 if (ifa->flags & IFA_F_PERMANENT) {
749 onlink = 1;
750 if (deleted)
751 break;
752 } else {
753 unsigned long lifetime;
754
755 if (!onlink)
756 onlink = -1;
757
758 spin_lock(&ifa->lock);
4bed72e4
YH		 759
760 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
761 /*
762 * Note: Because this address is
763 * not permanent, lifetime <
764 * LONG_MAX / HZ here.
765 */
1da177e4
LT		 766 if (time_before(expires,
767 ifa->tstamp + lifetime * HZ))
768 expires = ifa->tstamp + lifetime * HZ;
769 spin_unlock(&ifa->lock);
770 }
771 }
772 }
773 }
774 write_unlock_bh(&idev->lock);
775
b2238566
AV		 776 addrconf_del_timer(ifp);
777
1da177e4
LT		 778 ipv6_ifa_notify(RTM_DELADDR, ifp);
779
e041c683 780 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifp);
1da177e4 781
1da177e4
LT		 782 /*
783 * Purge or update corresponding prefix
784 *
785 * 1) we don't purge prefix here if address was not permanent.
786 * prefix is managed by its own lifetime.
787 * 2) if there're no addresses, delete prefix.
788 * 3) if there're still other permanent address(es),
789 * corresponding prefix is still permanent.
790 * 4) otherwise, update prefix lifetime to the
791 * longest valid lifetime among the corresponding
792 * addresses on the device.
793 * Note: subsequent RA will update lifetime.
794 *
795 * --yoshfuji
796 */
797 if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) {
798 struct in6_addr prefix;
799 struct rt6_info *rt;
c346dca1 800 struct net *net = dev_net(ifp->idev->dev);
1da177e4 801 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len);
6fda7350 802 rt = rt6_lookup(net, &prefix, NULL, ifp->idev->dev->ifindex, 1);
1da177e4 803
2b5ead46 804 if (rt && addrconf_is_prefix_route(rt)) {
1da177e4 805 if (onlink == 0) {
e0a1ad73 806 ip6_del_rt(rt);
1da177e4
LT		 807 rt = NULL;
808 } else if (!(rt->rt6i_flags & RTF_EXPIRES)) {
809 rt->rt6i_expires = expires;
810 rt->rt6i_flags |= RTF_EXPIRES;
811 }
812 }
d8d1f30b 813 dst_release(&rt->dst);
1da177e4
LT		 814 }
815
c3968a85
DW		 816 /* clean up prefsrc entries */
817 rt6_remove_prefsrc(ifp);
4c5ff6a6 818out:
1da177e4
LT		 819 in6_ifa_put(ifp);
820}
821
822#ifdef CONFIG_IPV6_PRIVACY
823static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
824{
825 struct inet6_dev *idev = ifp->idev;
826 struct in6_addr addr, *tmpaddr;
7a876b0e 827 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_cstamp, tmp_tstamp, age;
eac55bf9 828 unsigned long regen_advance;
1da177e4
LT		 829 int tmp_plen;
830 int ret = 0;
831 int max_addresses;
95c385b4 832 u32 addr_flags;
1da177e4
LT		 833
834 write_lock(&idev->lock);
835 if (ift) {
836 spin_lock_bh(&ift->lock);
837 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
838 spin_unlock_bh(&ift->lock);
839 tmpaddr = &addr;
840 } else {
841 tmpaddr = NULL;
842 }
843retry:
844 in6_dev_hold(idev);
845 if (idev->cnf.use_tempaddr <= 0) {
846 write_unlock(&idev->lock);
847 printk(KERN_INFO
848 "ipv6_create_tempaddr(): use_tempaddr is disabled.\n");
849 in6_dev_put(idev);
850 ret = -1;
851 goto out;
852 }
853 spin_lock_bh(&ifp->lock);
854 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
855 idev->cnf.use_tempaddr = -1; /*XXX*/
856 spin_unlock_bh(&ifp->lock);
857 write_unlock(&idev->lock);
858 printk(KERN_WARNING
859 "ipv6_create_tempaddr(): regeneration time exceeded. disabled temporary address support.\n");
860 in6_dev_put(idev);
861 ret = -1;
862 goto out;
863 }
864 in6_ifa_hold(ifp);
865 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
866 if (__ipv6_try_regen_rndid(idev, tmpaddr) < 0) {
867 spin_unlock_bh(&ifp->lock);
868 write_unlock(&idev->lock);
869 printk(KERN_WARNING
870 "ipv6_create_tempaddr(): regeneration of randomized interface id failed.\n");
871 in6_ifa_put(ifp);
872 in6_dev_put(idev);
873 ret = -1;
874 goto out;
875 }
876 memcpy(&addr.s6_addr[8], idev->rndid, 8);
7a876b0e 877 age = (jiffies - ifp->tstamp) / HZ;
1da177e4
LT		 878 tmp_valid_lft = min_t(__u32,
879 ifp->valid_lft,
7a876b0e 880 idev->cnf.temp_valid_lft + age);
1ab1457c
YH		 881 tmp_prefered_lft = min_t(__u32,
882 ifp->prefered_lft,
7a876b0e 883 idev->cnf.temp_prefered_lft + age -
784e2710 884 idev->cnf.max_desync_factor);
1da177e4
LT		 885 tmp_plen = ifp->prefix_len;
886 max_addresses = idev->cnf.max_addresses;
887 tmp_cstamp = ifp->cstamp;
888 tmp_tstamp = ifp->tstamp;
889 spin_unlock_bh(&ifp->lock);
890
eac55bf9
BB		 891 regen_advance = idev->cnf.regen_max_retry *
892 idev->cnf.dad_transmits *
893 idev->nd_parms->retrans_time / HZ;
1da177e4 894 write_unlock(&idev->lock);
95c385b4 895
eac55bf9
BB		 896 /* A temporary address is created only if this calculated Preferred
897 * Lifetime is greater than REGEN_ADVANCE time units. In particular,
898 * an implementation must not create a temporary address with a zero
899 * Preferred Lifetime.
900 */
901 if (tmp_prefered_lft <= regen_advance) {
902 in6_ifa_put(ifp);
903 in6_dev_put(idev);
904 ret = -1;
905 goto out;
906 }
907
95c385b4
NH		 908 addr_flags = IFA_F_TEMPORARY;
909 /* set in addrconf_prefix_rcv() */
910 if (ifp->flags & IFA_F_OPTIMISTIC)
911 addr_flags |= IFA_F_OPTIMISTIC;
912
1da177e4 913 ift = !max_addresses ||
1ab1457c 914 ipv6_count_addresses(idev) < max_addresses ?
1da177e4 915 ipv6_add_addr(idev, &addr, tmp_plen,
95c385b4
NH		 916 ipv6_addr_type(&addr)&IPV6_ADDR_SCOPE_MASK,
917 addr_flags) : NULL;
1da177e4
LT		 918 if (!ift || IS_ERR(ift)) {
919 in6_ifa_put(ifp);
920 in6_dev_put(idev);
921 printk(KERN_INFO
922 "ipv6_create_tempaddr(): retry temporary address regeneration.\n");
923 tmpaddr = &addr;
924 write_lock(&idev->lock);
925 goto retry;
926 }
927
928 spin_lock_bh(&ift->lock);
929 ift->ifpub = ifp;
930 ift->valid_lft = tmp_valid_lft;
931 ift->prefered_lft = tmp_prefered_lft;
932 ift->cstamp = tmp_cstamp;
933 ift->tstamp = tmp_tstamp;
934 spin_unlock_bh(&ift->lock);
935
936 addrconf_dad_start(ift, 0);
937 in6_ifa_put(ift);
938 in6_dev_put(idev);
939out:
940 return ret;
941}
942#endif
943
944/*
072047e4 945 * Choose an appropriate source address (RFC3484)
1da177e4 946 */
a9b05723
YH		 947enum {
948 IPV6_SADDR_RULE_INIT = 0,
949 IPV6_SADDR_RULE_LOCAL,
950 IPV6_SADDR_RULE_SCOPE,
951 IPV6_SADDR_RULE_PREFERRED,
952#ifdef CONFIG_IPV6_MIP6
953 IPV6_SADDR_RULE_HOA,
954#endif
955 IPV6_SADDR_RULE_OIF,
956 IPV6_SADDR_RULE_LABEL,
957#ifdef CONFIG_IPV6_PRIVACY
958 IPV6_SADDR_RULE_PRIVACY,
959#endif
960 IPV6_SADDR_RULE_ORCHID,
961 IPV6_SADDR_RULE_PREFIX,
962 IPV6_SADDR_RULE_MAX
963};
964
072047e4 965struct ipv6_saddr_score {
a9b05723
YH		 966 int rule;
967 int addr_type;
968 struct inet6_ifaddr *ifa;
969 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
970 int scopedist;
971 int matchlen;
072047e4
YH		 972};
973
a9b05723 974struct ipv6_saddr_dst {
9acd9f3a 975 const struct in6_addr *addr;
a9b05723
YH		 976 int ifindex;
977 int scope;
978 int label;
7cbca67c 979 unsigned int prefs;
a9b05723 980};
072047e4 981
b6f99a21 982static inline int ipv6_saddr_preferred(int type)
1da177e4 983{
45bb0060 984 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
072047e4
YH		 985 return 1;
986 return 0;
1da177e4
LT		 987}
988
3de23255
BT		 989static int ipv6_get_saddr_eval(struct net *net,
990 struct ipv6_saddr_score *score,
a9b05723
YH		 991 struct ipv6_saddr_dst *dst,
992 int i)
993{
994 int ret;
995
996 if (i <= score->rule) {
997 switch (i) {
998 case IPV6_SADDR_RULE_SCOPE:
999 ret = score->scopedist;
1000 break;
1001 case IPV6_SADDR_RULE_PREFIX:
1002 ret = score->matchlen;
1003 break;
1004 default:
1005 ret = !!test_bit(i, score->scorebits);
1006 }
1007 goto out;
1008 }
1009
1010 switch (i) {
1011 case IPV6_SADDR_RULE_INIT:
1012 /* Rule 0: remember if hiscore is not ready yet */
1013 ret = !!score->ifa;
1014 break;
1015 case IPV6_SADDR_RULE_LOCAL:
1016 /* Rule 1: Prefer same address */
1017 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1018 break;
1019 case IPV6_SADDR_RULE_SCOPE:
1020 /* Rule 2: Prefer appropriate scope
1021 *
1022 * ret
1023 * ^
1024 * -1 | d 15
1025 * ---+--+-+---> scope
1026 * |
1027 * | d is scope of the destination.
1028 * B-d | \
1029 * | \ <- smaller scope is better if
1030 * B-15 | \ if scope is enough for destinaion.
1031 * | ret = B - scope (-1 <= scope >= d <= 15).
1032 * d-C-1 | /
1033 * |/ <- greater is better
1034 * -C / if scope is not enough for destination.
1035 * /| ret = scope - C (-1 <= d < scope <= 15).
1036 *
1037 * d - C - 1 < B -15 (for all -1 <= d <= 15).
1038 * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1039 * Assume B = 0 and we get C > 29.
1040 */
1041 ret = __ipv6_addr_src_scope(score->addr_type);
1042 if (ret >= dst->scope)
1043 ret = -ret;
1044 else
1045 ret -= 128; /* 30 is enough */
1046 score->scopedist = ret;
1047 break;
1048 case IPV6_SADDR_RULE_PREFERRED:
1049 /* Rule 3: Avoid deprecated and optimistic addresses */
1050 ret = ipv6_saddr_preferred(score->addr_type) ||
1051 !(score->ifa->flags & (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC));
1052 break;
1053#ifdef CONFIG_IPV6_MIP6
1054 case IPV6_SADDR_RULE_HOA:
7cbca67c 1055 {
a9b05723 1056 /* Rule 4: Prefer home address */
7cbca67c
YH		 1057 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1058 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
a9b05723 1059 break;
7cbca67c 1060 }
a9b05723
YH		 1061#endif
1062 case IPV6_SADDR_RULE_OIF:
1063 /* Rule 5: Prefer outgoing interface */
1064 ret = (!dst->ifindex ||
1065 dst->ifindex == score->ifa->idev->dev->ifindex);
1066 break;
1067 case IPV6_SADDR_RULE_LABEL:
1068 /* Rule 6: Prefer matching label */
3de23255
BT		 1069 ret = ipv6_addr_label(net,
1070 &score->ifa->addr, score->addr_type,
a9b05723
YH		 1071 score->ifa->idev->dev->ifindex) == dst->label;
1072 break;
1073#ifdef CONFIG_IPV6_PRIVACY
1074 case IPV6_SADDR_RULE_PRIVACY:
7cbca67c 1075 {
a9b05723 1076 /* Rule 7: Prefer public address
25985edc 1077 * Note: prefer temporary address if use_tempaddr >= 2
a9b05723 1078 */
7cbca67c
YH		 1079 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1080 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1081 score->ifa->idev->cnf.use_tempaddr >= 2;
1082 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
a9b05723 1083 break;
7cbca67c 1084 }
a9b05723
YH		 1085#endif
1086 case IPV6_SADDR_RULE_ORCHID:
1087 /* Rule 8-: Prefer ORCHID vs ORCHID or
1088 * non-ORCHID vs non-ORCHID
1089 */
1090 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1091 ipv6_addr_orchid(dst->addr));
1092 break;
1093 case IPV6_SADDR_RULE_PREFIX:
1094 /* Rule 8: Use longest matching prefix */
1095 score->matchlen = ret = ipv6_addr_diff(&score->ifa->addr,
1096 dst->addr);
1097 break;
1098 default:
1099 ret = 0;
1100 }
1101
1102 if (ret)
1103 __set_bit(i, score->scorebits);
1104 score->rule = i;
1105out:
1106 return ret;
1107}
1108
191cd582 1109int ipv6_dev_get_saddr(struct net *net, struct net_device *dst_dev,
9acd9f3a 1110 const struct in6_addr *daddr, unsigned int prefs,
7cbca67c 1111 struct in6_addr *saddr)
1da177e4 1112{
a9b05723
YH		 1113 struct ipv6_saddr_score scores[2],
1114 *score = &scores[0], *hiscore = &scores[1];
a9b05723 1115 struct ipv6_saddr_dst dst;
072047e4 1116 struct net_device *dev;
a9b05723 1117 int dst_type;
1da177e4 1118
a9b05723
YH		 1119 dst_type = __ipv6_addr_type(daddr);
1120 dst.addr = daddr;
1121 dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1122 dst.scope = __ipv6_addr_src_scope(dst_type);
3de23255 1123 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
7cbca67c 1124 dst.prefs = prefs;
a9b05723
YH		 1125
1126 hiscore->rule = -1;
1127 hiscore->ifa = NULL;
1da177e4 1128
8814c4b5 1129 rcu_read_lock();
1da177e4 1130
c6d14c84 1131 for_each_netdev_rcu(net, dev) {
072047e4 1132 struct inet6_dev *idev;
072047e4 1133
a9b05723 1134 /* Candidate Source Address (section 4)
072047e4
YH		 1135 * - multicast and link-local destination address,
1136 * the set of candidate source address MUST only
1137 * include addresses assigned to interfaces
1138 * belonging to the same link as the outgoing
1139 * interface.
1140 * (- For site-local destination addresses, the
1141 * set of candidate source addresses MUST only
1142 * include addresses assigned to interfaces
1143 * belonging to the same site as the outgoing
1144 * interface.)
1145 */
a9b05723
YH		 1146 if (((dst_type & IPV6_ADDR_MULTICAST) ||
1147 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL) &&
1148 dst.ifindex && dev->ifindex != dst.ifindex)
072047e4 1149 continue;
1da177e4 1150
1da177e4 1151 idev = __in6_dev_get(dev);
072047e4
YH		 1152 if (!idev)
1153 continue;
1154
1155 read_lock_bh(&idev->lock);
502a2ffd 1156 list_for_each_entry(score->ifa, &idev->addr_list, if_list) {
a9b05723 1157 int i;
072047e4 1158
a9b05723 1159 /*
6b3ae80a
YH		 1160 * - Tentative Address (RFC2462 section 5.4)
1161 * - A tentative address is not considered
1162 * "assigned to an interface" in the traditional
95c385b4 1163 * sense, unless it is also flagged as optimistic.
6b3ae80a 1164 * - Candidate Source Address (section 4)
072047e4
YH		 1165 * - In any case, anycast addresses, multicast
1166 * addresses, and the unspecified address MUST
1167 * NOT be included in a candidate set.
1168 */
a9b05723
YH		 1169 if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1170 (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
6b3ae80a 1171 continue;
a9b05723
YH		 1172
1173 score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1174
1175 if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1176 score->addr_type & IPV6_ADDR_MULTICAST)) {
072047e4 1177 LIMIT_NETDEBUG(KERN_DEBUG
3b6d821c 1178 "ADDRCONF: unspecified / multicast address "
072047e4
YH		 1179 "assigned as unicast address on %s",
1180 dev->name);
1181 continue;
1182 }
1183
a9b05723
YH		 1184 score->rule = -1;
1185 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1186
1187 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1188 int minihiscore, miniscore;
1189
3de23255
BT		 1190 minihiscore = ipv6_get_saddr_eval(net, hiscore, &dst, i);
1191 miniscore = ipv6_get_saddr_eval(net, score, &dst, i);
a9b05723
YH		 1192
1193 if (minihiscore > miniscore) {
1194 if (i == IPV6_SADDR_RULE_SCOPE &&
1195 score->scopedist > 0) {
1196 /*
1197 * special case:
1198 * each remaining entry
1199 * has too small (not enough)
1200 * scope, because ifa entries
1201 * are sorted by their scope
1202 * values.
1203 */
1204 goto try_nextdev;
1205 }
1206 break;
1207 } else if (minihiscore < miniscore) {
a9b05723
YH		 1208 if (hiscore->ifa)
1209 in6_ifa_put(hiscore->ifa);
1210
1211 in6_ifa_hold(score->ifa);
1212
a0bffffc 1213 swap(hiscore, score);
a9b05723
YH		 1214
1215 /* restore our iterator */
1216 score->ifa = hiscore->ifa;
1217
1218 break;
1da177e4 1219 }
072047e4 1220 }
1da177e4 1221 }
a9b05723 1222try_nextdev:
072047e4 1223 read_unlock_bh(&idev->lock);
1da177e4 1224 }
8814c4b5 1225 rcu_read_unlock();
1da177e4 1226
a9b05723 1227 if (!hiscore->ifa)
072047e4 1228 return -EADDRNOTAVAIL;
1ab1457c 1229
a9b05723
YH		 1230 ipv6_addr_copy(saddr, &hiscore->ifa->addr);
1231 in6_ifa_put(hiscore->ifa);
072047e4 1232 return 0;
1da177e4 1233}
5e5f3f0f 1234EXPORT_SYMBOL(ipv6_dev_get_saddr);
1da177e4 1235
95c385b4
NH		 1236int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1237 unsigned char banned_flags)
1da177e4
LT		 1238{
1239 struct inet6_dev *idev;
1240 int err = -EADDRNOTAVAIL;
1241
8814c4b5 1242 rcu_read_lock();
e21e8467
SH		 1243 idev = __in6_dev_get(dev);
1244 if (idev) {
1da177e4
LT		 1245 struct inet6_ifaddr *ifp;
1246
1247 read_lock_bh(&idev->lock);
502a2ffd 1248 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1249 if (ifp->scope == IFA_LINK &&
1250 !(ifp->flags & banned_flags)) {
1da177e4
LT		 1251 ipv6_addr_copy(addr, &ifp->addr);
1252 err = 0;
1253 break;
1254 }
1255 }
1256 read_unlock_bh(&idev->lock);
1257 }
8814c4b5 1258 rcu_read_unlock();
1da177e4
LT		 1259 return err;
1260}
1261
1262static int ipv6_count_addresses(struct inet6_dev *idev)
1263{
1264 int cnt = 0;
1265 struct inet6_ifaddr *ifp;
1266
1267 read_lock_bh(&idev->lock);
502a2ffd 1268 list_for_each_entry(ifp, &idev->addr_list, if_list)
1da177e4
LT		 1269 cnt++;
1270 read_unlock_bh(&idev->lock);
1271 return cnt;
1272}
1273
b71d1d42 1274int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
bfeade08 1275 struct net_device *dev, int strict)
1da177e4 1276{
eedf042a 1277 struct inet6_ifaddr *ifp;
c2e21293 1278 struct hlist_node *node;
3a88a81d 1279 unsigned int hash = ipv6_addr_hash(addr);
1da177e4 1280
5c578aed 1281 rcu_read_lock_bh();
1282 hlist_for_each_entry_rcu(ifp, node, &inet6_addr_lst[hash], addr_lst) {
878628fb 1283 if (!net_eq(dev_net(ifp->idev->dev), net))
bfeade08 1284 continue;
1da177e4 1285 if (ipv6_addr_equal(&ifp->addr, addr) &&
eedf042a
SH		 1286 !(ifp->flags&IFA_F_TENTATIVE) &&
1287 (dev == NULL || ifp->idev->dev == dev ||
1288 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) {
1289 rcu_read_unlock_bh();
1290 return 1;
1da177e4
LT		 1291 }
1292 }
5c578aed 1293
eedf042a
SH		 1294 rcu_read_unlock_bh();
1295 return 0;
1da177e4 1296}
7159039a
YH		 1297EXPORT_SYMBOL(ipv6_chk_addr);
1298
3e81c6da
DM		 1299static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1300 struct net_device *dev)
1da177e4 1301{
3e81c6da 1302 unsigned int hash = ipv6_addr_hash(addr);
c2e21293 1303 struct inet6_ifaddr *ifp;
1304 struct hlist_node *node;
1da177e4 1305
c2e21293 1306 hlist_for_each_entry(ifp, node, &inet6_addr_lst[hash], addr_lst) {
878628fb 1307 if (!net_eq(dev_net(ifp->idev->dev), net))
06bfe655 1308 continue;
1da177e4
LT		 1309 if (ipv6_addr_equal(&ifp->addr, addr)) {
1310 if (dev == NULL || ifp->idev->dev == dev)
3e81c6da 1311 return true;
1da177e4
LT		 1312 }
1313 }
3e81c6da 1314 return false;
1da177e4
LT		 1315}
1316
b71d1d42 1317int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev)
52eeeb84
YH		 1318{
1319 struct inet6_dev *idev;
1320 struct inet6_ifaddr *ifa;
1321 int onlink;
1322
1323 onlink = 0;
1324 rcu_read_lock();
1325 idev = __in6_dev_get(dev);
1326 if (idev) {
1327 read_lock_bh(&idev->lock);
502a2ffd 1328 list_for_each_entry(ifa, &idev->addr_list, if_list) {
52eeeb84
YH		 1329 onlink = ipv6_prefix_equal(addr, &ifa->addr,
1330 ifa->prefix_len);
1331 if (onlink)
1332 break;
1333 }
1334 read_unlock_bh(&idev->lock);
1335 }
1336 rcu_read_unlock();
1337 return onlink;
1338}
1339
1340EXPORT_SYMBOL(ipv6_chk_prefix);
1341
9acd9f3a 1342struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1cab3da6 1343 struct net_device *dev, int strict)
1da177e4 1344{
b79d1d54 1345 struct inet6_ifaddr *ifp, *result = NULL;
3a88a81d 1346 unsigned int hash = ipv6_addr_hash(addr);
b79d1d54 1347 struct hlist_node *node;
1da177e4 1348
5c578aed 1349 rcu_read_lock_bh();
4f70ecca 1350 hlist_for_each_entry_rcu_bh(ifp, node, &inet6_addr_lst[hash], addr_lst) {
878628fb 1351 if (!net_eq(dev_net(ifp->idev->dev), net))
1cab3da6 1352 continue;
1da177e4
LT		 1353 if (ipv6_addr_equal(&ifp->addr, addr)) {
1354 if (dev == NULL || ifp->idev->dev == dev ||
1355 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
b79d1d54 1356 result = ifp;
1da177e4
LT		 1357 in6_ifa_hold(ifp);
1358 break;
1359 }
1360 }
1361 }
5c578aed 1362 rcu_read_unlock_bh();
1da177e4 1363
b79d1d54 1364 return result;
1da177e4
LT		 1365}
1366
1da177e4
LT		 1367/* Gets referenced address, destroys ifaddr */
1368
cc411d0b 1369static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
1da177e4 1370{
1da177e4
LT		 1371 if (ifp->flags&IFA_F_PERMANENT) {
1372 spin_lock_bh(&ifp->lock);
1373 addrconf_del_timer(ifp);
1374 ifp->flags |= IFA_F_TENTATIVE;
cc411d0b
BH		 1375 if (dad_failed)
1376 ifp->flags |= IFA_F_DADFAILED;
1da177e4 1377 spin_unlock_bh(&ifp->lock);
e2577a06
HX		 1378 if (dad_failed)
1379 ipv6_ifa_notify(0, ifp);
1da177e4
LT		 1380 in6_ifa_put(ifp);
1381#ifdef CONFIG_IPV6_PRIVACY
1382 } else if (ifp->flags&IFA_F_TEMPORARY) {
1383 struct inet6_ifaddr *ifpub;
1384 spin_lock_bh(&ifp->lock);
1385 ifpub = ifp->ifpub;
1386 if (ifpub) {
1387 in6_ifa_hold(ifpub);
1388 spin_unlock_bh(&ifp->lock);
1389 ipv6_create_tempaddr(ifpub, ifp);
1390 in6_ifa_put(ifpub);
1391 } else {
1392 spin_unlock_bh(&ifp->lock);
1393 }
1394 ipv6_del_addr(ifp);
1395#endif
1396 } else
1397 ipv6_del_addr(ifp);
1398}
1399
f2344a13
HX		 1400static int addrconf_dad_end(struct inet6_ifaddr *ifp)
1401{
1402 int err = -ENOENT;
1403
1404 spin_lock(&ifp->state_lock);
1405 if (ifp->state == INET6_IFADDR_STATE_DAD) {
1406 ifp->state = INET6_IFADDR_STATE_POSTDAD;
1407 err = 0;
1408 }
1409 spin_unlock(&ifp->state_lock);
1410
1411 return err;
1412}
1413
3c21edbd
YH		 1414void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1415{
1b34be74 1416 struct inet6_dev *idev = ifp->idev;
9bdd8d40 1417
853dc2e0
UB		 1418 if (addrconf_dad_end(ifp)) {
1419 in6_ifa_put(ifp);
f2344a13 1420 return;
853dc2e0 1421 }
f2344a13 1422
9bdd8d40 1423 if (net_ratelimit())
0522fea6
JR		 1424 printk(KERN_INFO "%s: IPv6 duplicate address %pI6c detected!\n",
1425 ifp->idev->dev->name, &ifp->addr);
9bdd8d40 1426
1b34be74
YH		 1427 if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6) {
1428 struct in6_addr addr;
1429
1430 addr.s6_addr32[0] = htonl(0xfe800000);
1431 addr.s6_addr32[1] = 0;
1432
1433 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
1434 ipv6_addr_equal(&ifp->addr, &addr)) {
1435 /* DAD failed for link-local based on MAC address */
1436 idev->cnf.disable_ipv6 = 1;
9bdd8d40
BH		 1437
1438 printk(KERN_INFO "%s: IPv6 being disabled!\n",
1439 ifp->idev->dev->name);
1b34be74
YH		 1440 }
1441 }
1442
cc411d0b 1443 addrconf_dad_stop(ifp, 1);
3c21edbd 1444}
1da177e4
LT		 1445
1446/* Join to solicited addr multicast group. */
1447
b71d1d42 1448void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr)
1da177e4
LT		 1449{
1450 struct in6_addr maddr;
1451
1452 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1453 return;
1454
1455 addrconf_addr_solict_mult(addr, &maddr);
1456 ipv6_dev_mc_inc(dev, &maddr);
1457}
1458
b71d1d42 1459void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr)
1da177e4
LT		 1460{
1461 struct in6_addr maddr;
1462
1463 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1464 return;
1465
1466 addrconf_addr_solict_mult(addr, &maddr);
1467 __ipv6_dev_mc_dec(idev, &maddr);
1468}
1469
20380731 1470static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1da177e4
LT		 1471{
1472 struct in6_addr addr;
2bda8a0c
BM		 1473 if (ifp->prefix_len == 127) /* RFC 6164 */
1474 return;
1da177e4
LT		 1475 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1476 if (ipv6_addr_any(&addr))
1477 return;
1478 ipv6_dev_ac_inc(ifp->idev->dev, &addr);
1479}
1480
20380731 1481static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1da177e4
LT		 1482{
1483 struct in6_addr addr;
32019e65
YH		 1484 if (ifp->prefix_len == 127) /* RFC 6164 */
1485 return;
1da177e4
LT		 1486 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1487 if (ipv6_addr_any(&addr))
1488 return;
1489 __ipv6_dev_ac_dec(ifp->idev, &addr);
1490}
1491
073a8e0e
YH		 1492static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
1493{
1494 if (dev->addr_len != ETH_ALEN)
1495 return -1;
1496 memcpy(eui, dev->dev_addr, 3);
1497 memcpy(eui + 5, dev->dev_addr + 3, 3);
1498
1499 /*
1500 * The zSeries OSA network cards can be shared among various
1501 * OS instances, but the OSA cards have only one MAC address.
1502 * This leads to duplicate address conflicts in conjunction
1503 * with IPv6 if more than one instance uses the same card.
1504 *
1505 * The driver for these cards can deliver a unique 16-bit
1506 * identifier for each instance sharing the same card. It is
1507 * placed instead of 0xFFFE in the interface identifier. The
1508 * "u" bit of the interface identifier is not inverted in this
1509 * case. Hence the resulting interface identifier has local
1510 * scope according to RFC2373.
1511 */
1512 if (dev->dev_id) {
1513 eui[3] = (dev->dev_id >> 8) & 0xFF;
1514 eui[4] = dev->dev_id & 0xFF;
1515 } else {
1516 eui[3] = 0xFF;
1517 eui[4] = 0xFE;
1518 eui[0] ^= 2;
1519 }
1520 return 0;
1521}
1522
1523static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1524{
1525 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1526 if (dev->addr_len != ARCNET_ALEN)
1527 return -1;
1528 memset(eui, 0, 7);
1529 eui[7] = *(u8*)dev->dev_addr;
1530 return 0;
1531}
1532
1533static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1534{
1535 if (dev->addr_len != INFINIBAND_ALEN)
1536 return -1;
1537 memcpy(eui, dev->dev_addr + 12, 8);
1538 eui[0] |= 2;
1539 return 0;
1540}
1541
c61393ea 1542static int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
dfd982ba 1543{
9af28511
SH		 1544 if (addr == 0)
1545 return -1;
dfd982ba
YH		 1546 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
1547 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
1548 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
1549 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
1550 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
1551 ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
1552 eui[1] = 0;
1553 eui[2] = 0x5E;
1554 eui[3] = 0xFE;
1555 memcpy(eui + 4, &addr, 4);
1556 return 0;
1557}
dfd982ba
YH		 1558
1559static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
1560{
1561 if (dev->priv_flags & IFF_ISATAP)
1562 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1563 return -1;
1564}
1565
aee80b54 1566static int addrconf_ifid_gre(u8 *eui, struct net_device *dev)
1567{
1568 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1569}
1570
1da177e4
LT		 1571static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1572{
1573 switch (dev->type) {
1574 case ARPHRD_ETHER:
1575 case ARPHRD_FDDI:
1576 case ARPHRD_IEEE802_TR:
073a8e0e 1577 return addrconf_ifid_eui48(eui, dev);
1da177e4 1578 case ARPHRD_ARCNET:
073a8e0e 1579 return addrconf_ifid_arcnet(eui, dev);
1da177e4 1580 case ARPHRD_INFINIBAND:
073a8e0e 1581 return addrconf_ifid_infiniband(eui, dev);
c7dc89c0 1582 case ARPHRD_SIT:
dfd982ba 1583 return addrconf_ifid_sit(eui, dev);
aee80b54 1584 case ARPHRD_IPGRE:
1585 return addrconf_ifid_gre(eui, dev);
1da177e4
LT		 1586 }
1587 return -1;
1588}
1589
1590static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1591{
1592 int err = -1;
1593 struct inet6_ifaddr *ifp;
1594
1595 read_lock_bh(&idev->lock);
502a2ffd 1596 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1da177e4
LT		 1597 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1598 memcpy(eui, ifp->addr.s6_addr+8, 8);
1599 err = 0;
1600 break;
1601 }
1602 }
1603 read_unlock_bh(&idev->lock);
1604 return err;
1605}
1606
1607#ifdef CONFIG_IPV6_PRIVACY
1608/* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
1609static int __ipv6_regen_rndid(struct inet6_dev *idev)
1610{
1da177e4 1611regen:
955189ef 1612 get_random_bytes(idev->rndid, sizeof(idev->rndid));
1da177e4 1613 idev->rndid[0] &= ~0x02;
1da177e4
LT		 1614
1615 /*
1616 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1617 * check if generated address is not inappropriate
1618 *
1619 * - Reserved subnet anycast (RFC 2526)
1620 * 11111101 11....11 1xxxxxxx
c7dc89c0 1621 * - ISATAP (RFC4214) 6.1
1da177e4
LT		 1622 * 00-00-5E-FE-xx-xx-xx-xx
1623 * - value 0
1624 * - XXX: already assigned to an address on the device
1625 */
1ab1457c 1626 if (idev->rndid[0] == 0xfd &&
1da177e4
LT		 1627 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1628 (idev->rndid[7]&0x80))
1629 goto regen;
1630 if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1631 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1632 goto regen;
1633 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1634 goto regen;
1635 }
1636
1637 return 0;
1638}
1639
1640static void ipv6_regen_rndid(unsigned long data)
1641{
1642 struct inet6_dev *idev = (struct inet6_dev *) data;
1643 unsigned long expires;
1644
8814c4b5 1645 rcu_read_lock_bh();
1da177e4
LT		 1646 write_lock_bh(&idev->lock);
1647
1648 if (idev->dead)
1649 goto out;
1650
1651 if (__ipv6_regen_rndid(idev) < 0)
1652 goto out;
1ab1457c 1653
1da177e4 1654 expires = jiffies +
1ab1457c 1655 idev->cnf.temp_prefered_lft * HZ -
784e2710
BH		 1656 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time -
1657 idev->cnf.max_desync_factor * HZ;
1da177e4
LT		 1658 if (time_before(expires, jiffies)) {
1659 printk(KERN_WARNING
1660 "ipv6_regen_rndid(): too short regeneration interval; timer disabled for %s.\n",
1661 idev->dev->name);
1662 goto out;
1663 }
1664
1665 if (!mod_timer(&idev->regen_timer, expires))
1666 in6_dev_hold(idev);
1667
1668out:
1669 write_unlock_bh(&idev->lock);
8814c4b5 1670 rcu_read_unlock_bh();
1da177e4
LT		 1671 in6_dev_put(idev);
1672}
1673
1674static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) {
1675 int ret = 0;
1676
1677 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
1678 ret = __ipv6_regen_rndid(idev);
1679 return ret;
1680}
1681#endif
1682
1683/*
1684 * Add prefix route.
1685 */
1686
1687static void
1688addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
e431b8c0 1689 unsigned long expires, u32 flags)
1da177e4 1690{
86872cb5
TG		 1691 struct fib6_config cfg = {
1692 .fc_table = RT6_TABLE_PREFIX,
1693 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1694 .fc_ifindex = dev->ifindex,
1695 .fc_expires = expires,
1696 .fc_dst_len = plen,
1697 .fc_flags = RTF_UP | flags,
c346dca1 1698 .fc_nlinfo.nl_net = dev_net(dev),
f410a1fb 1699 .fc_protocol = RTPROT_KERNEL,
86872cb5 1700 };
1da177e4 1701
86872cb5 1702 ipv6_addr_copy(&cfg.fc_dst, pfx);
1da177e4
LT		 1703
1704 /* Prevent useless cloning on PtP SIT.
1705 This thing is done here expecting that the whole
1706 class of non-broadcast devices need not cloning.
1707 */
0be669bb 1708#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
86872cb5
TG		 1709 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
1710 cfg.fc_flags |= RTF_NONEXTHOP;
0be669bb 1711#endif
1da177e4 1712
86872cb5 1713 ip6_route_add(&cfg);
1da177e4
LT		 1714}
1715
1716/* Create "default" multicast route to the interface */
1717
1718static void addrconf_add_mroute(struct net_device *dev)
1719{
86872cb5
TG		 1720 struct fib6_config cfg = {
1721 .fc_table = RT6_TABLE_LOCAL,
1722 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1723 .fc_ifindex = dev->ifindex,
1724 .fc_dst_len = 8,
1725 .fc_flags = RTF_UP,
c346dca1 1726 .fc_nlinfo.nl_net = dev_net(dev),
86872cb5
TG		 1727 };
1728
1729 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
1730
1731 ip6_route_add(&cfg);
1da177e4
LT		 1732}
1733
0be669bb 1734#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1da177e4
LT		 1735static void sit_route_add(struct net_device *dev)
1736{
86872cb5
TG		 1737 struct fib6_config cfg = {
1738 .fc_table = RT6_TABLE_MAIN,
1739 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1740 .fc_ifindex = dev->ifindex,
1741 .fc_dst_len = 96,
1742 .fc_flags = RTF_UP | RTF_NONEXTHOP,
c346dca1 1743 .fc_nlinfo.nl_net = dev_net(dev),
86872cb5 1744 };
1da177e4
LT		 1745
1746 /* prefix length - 96 bits "::d.d.d.d" */
86872cb5 1747 ip6_route_add(&cfg);
1da177e4 1748}
0be669bb 1749#endif
1da177e4
LT		 1750
1751static void addrconf_add_lroute(struct net_device *dev)
1752{
1753 struct in6_addr addr;
1754
1755 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
1756 addrconf_prefix_route(&addr, 64, dev, 0, 0);
1757}
1758
1759static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
1760{
1761 struct inet6_dev *idev;
1762
1763 ASSERT_RTNL();
1764
e21e8467
SH		 1765 idev = ipv6_find_idev(dev);
1766 if (!idev)
64e724f6
BH		 1767 return ERR_PTR(-ENOBUFS);
1768
1769 if (idev->cnf.disable_ipv6)
1770 return ERR_PTR(-EACCES);
1da177e4
LT		 1771
1772 /* Add default multicast route */
1773 addrconf_add_mroute(dev);
1774
1775 /* Add link local route */
1776 addrconf_add_lroute(dev);
1777 return idev;
1778}
1779
1780void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len)
1781{
1782 struct prefix_info *pinfo;
1783 __u32 valid_lft;
1784 __u32 prefered_lft;
1785 int addr_type;
1da177e4 1786 struct inet6_dev *in6_dev;
56d417b1 1787 struct net *net = dev_net(dev);
1da177e4
LT		 1788
1789 pinfo = (struct prefix_info *) opt;
1ab1457c 1790
1da177e4
LT		 1791 if (len < sizeof(struct prefix_info)) {
1792 ADBG(("addrconf: prefix option too short\n"));
1793 return;
1794 }
1ab1457c 1795
1da177e4
LT		 1796 /*
1797 * Validation checks ([ADDRCONF], page 19)
1798 */
1799
1800 addr_type = ipv6_addr_type(&pinfo->prefix);
1801
1802 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
1803 return;
1804
1805 valid_lft = ntohl(pinfo->valid);
1806 prefered_lft = ntohl(pinfo->prefered);
1807
1808 if (prefered_lft > valid_lft) {
1809 if (net_ratelimit())
1810 printk(KERN_WARNING "addrconf: prefix option has invalid lifetime\n");
1811 return;
1812 }
1813
1814 in6_dev = in6_dev_get(dev);
1815
1816 if (in6_dev == NULL) {
1817 if (net_ratelimit())
1818 printk(KERN_DEBUG "addrconf: device %s not configured\n", dev->name);
1819 return;
1820 }
1821
1822 /*
1823 * Two things going on here:
1824 * 1) Add routes for on-link prefixes
1825 * 2) Configure prefixes with the auto flag set
1826 */
1827
4bed72e4
YH		 1828 if (pinfo->onlink) {
1829 struct rt6_info *rt;
1830 unsigned long rt_expires;
1831
6f704992
YH		 1832 /* Avoid arithmetic overflow. Really, we could
1833 * save rt_expires in seconds, likely valid_lft,
1834 * but it would require division in fib gc, that it
1835 * not good.
1836 */
4bed72e4
YH		 1837 if (HZ > USER_HZ)
1838 rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
1839 else
1840 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
3dd4bc68 1841
4bed72e4
YH		 1842 if (addrconf_finite_timeout(rt_expires))
1843 rt_expires *= HZ;
1da177e4 1844
56d417b1 1845 rt = rt6_lookup(net, &pinfo->prefix, NULL,
6fda7350 1846 dev->ifindex, 1);
1da177e4 1847
2b5ead46 1848 if (rt && addrconf_is_prefix_route(rt)) {
6f704992
YH		 1849 /* Autoconf prefix route */
1850 if (valid_lft == 0) {
1851 ip6_del_rt(rt);
1852 rt = NULL;
4bed72e4 1853 } else if (addrconf_finite_timeout(rt_expires)) {
6f704992
YH		 1854 /* not infinity */
1855 rt->rt6i_expires = jiffies + rt_expires;
1856 rt->rt6i_flags |= RTF_EXPIRES;
1857 } else {
1858 rt->rt6i_flags &= ~RTF_EXPIRES;
1859 rt->rt6i_expires = 0;
1da177e4
LT		 1860 }
1861 } else if (valid_lft) {
6f704992 1862 clock_t expires = 0;
4bed72e4
YH		 1863 int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
1864 if (addrconf_finite_timeout(rt_expires)) {
6f704992
YH		 1865 /* not infinity */
1866 flags |= RTF_EXPIRES;
1867 expires = jiffies_to_clock_t(rt_expires);
1868 }
1da177e4 1869 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
6f704992 1870 dev, expires, flags);
1da177e4
LT		 1871 }
1872 if (rt)
d8d1f30b 1873 dst_release(&rt->dst);
1da177e4
LT		 1874 }
1875
1876 /* Try to figure out our local address for this prefix */
1877
1878 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
1879 struct inet6_ifaddr * ifp;
1880 struct in6_addr addr;
1881 int create = 0, update_lft = 0;
1882
1883 if (pinfo->prefix_len == 64) {
1884 memcpy(&addr, &pinfo->prefix, 8);
1885 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
1886 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
1887 in6_dev_put(in6_dev);
1888 return;
1889 }
1890 goto ok;
1891 }
1892 if (net_ratelimit())
1893 printk(KERN_DEBUG "IPv6 addrconf: prefix with wrong length %d\n",
1894 pinfo->prefix_len);
1895 in6_dev_put(in6_dev);
1896 return;
1897
1898ok:
1899
53b7997f 1900 ifp = ipv6_get_ifaddr(net, &addr, dev, 1);
1da177e4
LT		 1901
1902 if (ifp == NULL && valid_lft) {
1903 int max_addresses = in6_dev->cnf.max_addresses;
95c385b4
NH		 1904 u32 addr_flags = 0;
1905
1906#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1907 if (in6_dev->cnf.optimistic_dad &&
53b7997f 1908 !net->ipv6.devconf_all->forwarding)
95c385b4
NH		 1909 addr_flags = IFA_F_OPTIMISTIC;
1910#endif
1da177e4
LT		 1911
1912 /* Do not allow to create too much of autoconfigured
1913 * addresses; this would be too easy way to crash kernel.
1914 */
1915 if (!max_addresses ||
1916 ipv6_count_addresses(in6_dev) < max_addresses)
1917 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len,
95c385b4
NH		 1918 addr_type&IPV6_ADDR_SCOPE_MASK,
1919 addr_flags);
1da177e4
LT		 1920
1921 if (!ifp || IS_ERR(ifp)) {
1922 in6_dev_put(in6_dev);
1923 return;
1924 }
1925
1926 update_lft = create = 1;
1927 ifp->cstamp = jiffies;
1928 addrconf_dad_start(ifp, RTF_ADDRCONF|RTF_PREFIX_RT);
1929 }
1930
1931 if (ifp) {
1932 int flags;
1933 unsigned long now;
1934#ifdef CONFIG_IPV6_PRIVACY
1935 struct inet6_ifaddr *ift;
1936#endif
1937 u32 stored_lft;
1938
1939 /* update lifetime (RFC2462 5.5.3 e) */
1940 spin_lock(&ifp->lock);
1941 now = jiffies;
1942 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
1943 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
1944 else
1945 stored_lft = 0;
1946 if (!update_lft && stored_lft) {
1947 if (valid_lft > MIN_VALID_LIFETIME ||
1948 valid_lft > stored_lft)
1949 update_lft = 1;
1950 else if (stored_lft <= MIN_VALID_LIFETIME) {
1951 /* valid_lft <= stored_lft is always true */
a1ed0526
BH		 1952 /*
1953 * RFC 4862 Section 5.5.3e:
1954 * "Note that the preferred lifetime of
1955 * the corresponding address is always
1956 * reset to the Preferred Lifetime in
1957 * the received Prefix Information
1958 * option, regardless of whether the
1959 * valid lifetime is also reset or
1960 * ignored."
1961 *
1962 * So if the preferred lifetime in
1963 * this advertisement is different
1964 * than what we have stored, but the
1965 * valid lifetime is invalid, just
1966 * reset prefered_lft.
1967 *
1968 * We must set the valid lifetime
1969 * to the stored lifetime since we'll
1970 * be updating the timestamp below,
1971 * else we'll set it back to the
25985edc 1972 * minimum.
a1ed0526
BH		 1973 */
1974 if (prefered_lft != ifp->prefered_lft) {
1975 valid_lft = stored_lft;
1976 update_lft = 1;
1977 }
1da177e4
LT		 1978 } else {
1979 valid_lft = MIN_VALID_LIFETIME;
1980 if (valid_lft < prefered_lft)
1981 prefered_lft = valid_lft;
1982 update_lft = 1;
1983 }
1984 }
1985
1986 if (update_lft) {
1987 ifp->valid_lft = valid_lft;
1988 ifp->prefered_lft = prefered_lft;
1989 ifp->tstamp = now;
1990 flags = ifp->flags;
1991 ifp->flags &= ~IFA_F_DEPRECATED;
1992 spin_unlock(&ifp->lock);
1993
1994 if (!(flags&IFA_F_TENTATIVE))
1995 ipv6_ifa_notify(0, ifp);
1996 } else
1997 spin_unlock(&ifp->lock);
1998
1999#ifdef CONFIG_IPV6_PRIVACY
2000 read_lock_bh(&in6_dev->lock);
2001 /* update all temporary addresses in the list */
372e6c8f 2002 list_for_each_entry(ift, &in6_dev->tempaddr_list, tmp_list) {
1da177e4
LT		 2003 /*
2004 * When adjusting the lifetimes of an existing
2005 * temporary address, only lower the lifetimes.
2006 * Implementations must not increase the
2007 * lifetimes of an existing temporary address
2008 * when processing a Prefix Information Option.
2009 */
c6fbfac2
BB		 2010 if (ifp != ift->ifpub)
2011 continue;
2012
1da177e4
LT		 2013 spin_lock(&ift->lock);
2014 flags = ift->flags;
2015 if (ift->valid_lft > valid_lft &&
2016 ift->valid_lft - valid_lft > (jiffies - ift->tstamp) / HZ)
2017 ift->valid_lft = valid_lft + (jiffies - ift->tstamp) / HZ;
2018 if (ift->prefered_lft > prefered_lft &&
2019 ift->prefered_lft - prefered_lft > (jiffies - ift->tstamp) / HZ)
2020 ift->prefered_lft = prefered_lft + (jiffies - ift->tstamp) / HZ;
2021 spin_unlock(&ift->lock);
2022 if (!(flags&IFA_F_TENTATIVE))
2023 ipv6_ifa_notify(0, ift);
2024 }
2025
aed65501 2026 if ((create || list_empty(&in6_dev->tempaddr_list)) && in6_dev->cnf.use_tempaddr > 0) {
1da177e4
LT		 2027 /*
2028 * When a new public address is created as described in [ADDRCONF],
aed65501
GW		 2029 * also create a new temporary address. Also create a temporary
2030 * address if it's enabled but no temporary address currently exists.
1da177e4 2031 */
1ab1457c 2032 read_unlock_bh(&in6_dev->lock);
1da177e4
LT		 2033 ipv6_create_tempaddr(ifp, NULL);
2034 } else {
2035 read_unlock_bh(&in6_dev->lock);
2036 }
2037#endif
2038 in6_ifa_put(ifp);
2039 addrconf_verify(0);
2040 }
2041 }
2042 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
2043 in6_dev_put(in6_dev);
2044}
2045
2046/*
2047 * Set destination address.
2048 * Special case for SIT interfaces where we create a new "virtual"
2049 * device.
2050 */
af284937 2051int addrconf_set_dstaddr(struct net *net, void __user *arg)
1da177e4
LT		 2052{
2053 struct in6_ifreq ireq;
2054 struct net_device *dev;
2055 int err = -EINVAL;
2056
2057 rtnl_lock();
2058
2059 err = -EFAULT;
2060 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2061 goto err_exit;
2062
af284937 2063 dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
1da177e4
LT		 2064
2065 err = -ENODEV;
2066 if (dev == NULL)
2067 goto err_exit;
2068
0be669bb 2069#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1da177e4 2070 if (dev->type == ARPHRD_SIT) {
5bc3eb7e 2071 const struct net_device_ops *ops = dev->netdev_ops;
1da177e4 2072 struct ifreq ifr;
1da177e4
LT		 2073 struct ip_tunnel_parm p;
2074
2075 err = -EADDRNOTAVAIL;
2076 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2077 goto err_exit;
2078
2079 memset(&p, 0, sizeof(p));
2080 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2081 p.iph.saddr = 0;
2082 p.iph.version = 4;
2083 p.iph.ihl = 5;
2084 p.iph.protocol = IPPROTO_IPV6;
2085 p.iph.ttl = 64;
d20b3109 2086 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
1da177e4 2087
5bc3eb7e
SH		 2088 if (ops->ndo_do_ioctl) {
2089 mm_segment_t oldfs = get_fs();
2090
2091 set_fs(KERNEL_DS);
2092 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2093 set_fs(oldfs);
2094 } else
2095 err = -EOPNOTSUPP;
1da177e4
LT		 2096
2097 if (err == 0) {
2098 err = -ENOBUFS;
af284937
DL		 2099 dev = __dev_get_by_name(net, p.name);
2100 if (!dev)
1da177e4
LT		 2101 goto err_exit;
2102 err = dev_open(dev);
2103 }
2104 }
0be669bb 2105#endif
1da177e4
LT		 2106
2107err_exit:
2108 rtnl_unlock();
2109 return err;
2110}
2111
2112/*
2113 * Manual configuration of address on an interface
2114 */
b71d1d42 2115static int inet6_addr_add(struct net *net, int ifindex, const struct in6_addr *pfx,
24ef0da7 2116 unsigned int plen, __u8 ifa_flags, __u32 prefered_lft,
af284937 2117 __u32 valid_lft)
1da177e4
LT		 2118{
2119 struct inet6_ifaddr *ifp;
2120 struct inet6_dev *idev;
2121 struct net_device *dev;
2122 int scope;
6f704992
YH		 2123 u32 flags;
2124 clock_t expires;
4bed72e4 2125 unsigned long timeout;
1da177e4
LT		 2126
2127 ASSERT_RTNL();
1ab1457c 2128
24ef0da7
TG		 2129 if (plen > 128)
2130 return -EINVAL;
2131
0778769d
NT		 2132 /* check the lifetime */
2133 if (!valid_lft || prefered_lft > valid_lft)
2134 return -EINVAL;
2135
af284937
DL		 2136 dev = __dev_get_by_index(net, ifindex);
2137 if (!dev)
1da177e4 2138 return -ENODEV;
1ab1457c 2139
64e724f6
BH		 2140 idev = addrconf_add_dev(dev);
2141 if (IS_ERR(idev))
2142 return PTR_ERR(idev);
1da177e4
LT		 2143
2144 scope = ipv6_addr_scope(pfx);
2145
4bed72e4
YH		 2146 timeout = addrconf_timeout_fixup(valid_lft, HZ);
2147 if (addrconf_finite_timeout(timeout)) {
2148 expires = jiffies_to_clock_t(timeout * HZ);
2149 valid_lft = timeout;
6f704992 2150 flags = RTF_EXPIRES;
4bed72e4
YH		 2151 } else {
2152 expires = 0;
2153 flags = 0;
2154 ifa_flags |= IFA_F_PERMANENT;
6f704992 2155 }
0778769d 2156
4bed72e4
YH		 2157 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
2158 if (addrconf_finite_timeout(timeout)) {
2159 if (timeout == 0)
2160 ifa_flags |= IFA_F_DEPRECATED;
2161 prefered_lft = timeout;
2162 }
0778769d
NT		 2163
2164 ifp = ipv6_add_addr(idev, pfx, plen, scope, ifa_flags);
2165
1da177e4 2166 if (!IS_ERR(ifp)) {
06aebfb7 2167 spin_lock_bh(&ifp->lock);
0778769d
NT		 2168 ifp->valid_lft = valid_lft;
2169 ifp->prefered_lft = prefered_lft;
2170 ifp->tstamp = jiffies;
06aebfb7 2171 spin_unlock_bh(&ifp->lock);
0778769d 2172
46d48046 2173 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
6f704992 2174 expires, flags);
95c385b4
NH		 2175 /*
2176 * Note that section 3.1 of RFC 4429 indicates
2177 * that the Optimistic flag should not be set for
2178 * manually configured addresses
2179 */
1da177e4
LT		 2180 addrconf_dad_start(ifp, 0);
2181 in6_ifa_put(ifp);
0778769d 2182 addrconf_verify(0);
1da177e4
LT		 2183 return 0;
2184 }
2185
2186 return PTR_ERR(ifp);
2187}
2188
b71d1d42 2189static int inet6_addr_del(struct net *net, int ifindex, const struct in6_addr *pfx,
24ef0da7 2190 unsigned int plen)
1da177e4
LT		 2191{
2192 struct inet6_ifaddr *ifp;
2193 struct inet6_dev *idev;
2194 struct net_device *dev;
1ab1457c 2195
24ef0da7
TG		 2196 if (plen > 128)
2197 return -EINVAL;
2198
af284937
DL		 2199 dev = __dev_get_by_index(net, ifindex);
2200 if (!dev)
1da177e4
LT		 2201 return -ENODEV;
2202
2203 if ((idev = __in6_dev_get(dev)) == NULL)
2204 return -ENXIO;
2205
2206 read_lock_bh(&idev->lock);
502a2ffd 2207 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1da177e4
LT		 2208 if (ifp->prefix_len == plen &&
2209 ipv6_addr_equal(pfx, &ifp->addr)) {
2210 in6_ifa_hold(ifp);
2211 read_unlock_bh(&idev->lock);
1ab1457c 2212
1da177e4
LT		 2213 ipv6_del_addr(ifp);
2214
2215 /* If the last address is deleted administratively,
2216 disable IPv6 on this interface.
2217 */
502a2ffd 2218 if (list_empty(&idev->addr_list))
1da177e4
LT		 2219 addrconf_ifdown(idev->dev, 1);
2220 return 0;
2221 }
2222 }
2223 read_unlock_bh(&idev->lock);
2224 return -EADDRNOTAVAIL;
2225}
2226
2227
af284937 2228int addrconf_add_ifaddr(struct net *net, void __user *arg)
1da177e4
LT		 2229{
2230 struct in6_ifreq ireq;
2231 int err;
1ab1457c 2232
1da177e4
LT		 2233 if (!capable(CAP_NET_ADMIN))
2234 return -EPERM;
1ab1457c 2235
1da177e4
LT		 2236 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2237 return -EFAULT;
2238
2239 rtnl_lock();
af284937
DL		 2240 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2241 ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2242 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
1da177e4
LT		 2243 rtnl_unlock();
2244 return err;
2245}
2246
af284937 2247int addrconf_del_ifaddr(struct net *net, void __user *arg)
1da177e4
LT		 2248{
2249 struct in6_ifreq ireq;
2250 int err;
1ab1457c 2251
1da177e4
LT		 2252 if (!capable(CAP_NET_ADMIN))
2253 return -EPERM;
2254
2255 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2256 return -EFAULT;
2257
2258 rtnl_lock();
af284937
DL		 2259 err = inet6_addr_del(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2260 ireq.ifr6_prefixlen);
1da177e4
LT		 2261 rtnl_unlock();
2262 return err;
2263}
2264
b5f348e5
IJ		 2265static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
2266 int plen, int scope)
2267{
2268 struct inet6_ifaddr *ifp;
2269
2270 ifp = ipv6_add_addr(idev, addr, plen, scope, IFA_F_PERMANENT);
2271 if (!IS_ERR(ifp)) {
2272 spin_lock_bh(&ifp->lock);
2273 ifp->flags &= ~IFA_F_TENTATIVE;
2274 spin_unlock_bh(&ifp->lock);
2275 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2276 in6_ifa_put(ifp);
2277 }
2278}
2279
0be669bb 2280#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1da177e4
LT		 2281static void sit_add_v4_addrs(struct inet6_dev *idev)
2282{
1da177e4
LT		 2283 struct in6_addr addr;
2284 struct net_device *dev;
c346dca1 2285 struct net *net = dev_net(idev->dev);
1da177e4
LT		 2286 int scope;
2287
2288 ASSERT_RTNL();
2289
2290 memset(&addr, 0, sizeof(struct in6_addr));
2291 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2292
2293 if (idev->dev->flags&IFF_POINTOPOINT) {
2294 addr.s6_addr32[0] = htonl(0xfe800000);
2295 scope = IFA_LINK;
2296 } else {
2297 scope = IPV6_ADDR_COMPATv4;
2298 }
2299
2300 if (addr.s6_addr32[3]) {
b5f348e5 2301 add_addr(idev, &addr, 128, scope);
1da177e4
LT		 2302 return;
2303 }
2304
6fda7350 2305 for_each_netdev(net, dev) {
e5ed6399 2306 struct in_device * in_dev = __in_dev_get_rtnl(dev);
1da177e4
LT		 2307 if (in_dev && (dev->flags & IFF_UP)) {
2308 struct in_ifaddr * ifa;
2309
2310 int flag = scope;
2311
2312 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2313 int plen;
2314
2315 addr.s6_addr32[3] = ifa->ifa_local;
2316
2317 if (ifa->ifa_scope == RT_SCOPE_LINK)
2318 continue;
2319 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2320 if (idev->dev->flags&IFF_POINTOPOINT)
2321 continue;
2322 flag |= IFA_HOST;
2323 }
2324 if (idev->dev->flags&IFF_POINTOPOINT)
2325 plen = 64;
2326 else
2327 plen = 96;
2328
b5f348e5 2329 add_addr(idev, &addr, plen, flag);
1da177e4
LT		 2330 }
2331 }
1ab1457c 2332 }
1da177e4 2333}
0be669bb 2334#endif
1da177e4
LT		 2335
2336static void init_loopback(struct net_device *dev)
2337{
2338 struct inet6_dev *idev;
1da177e4
LT		 2339
2340 /* ::1 */
2341
2342 ASSERT_RTNL();
2343
2344 if ((idev = ipv6_find_idev(dev)) == NULL) {
2345 printk(KERN_DEBUG "init loopback: add_dev failed\n");
2346 return;
2347 }
2348
b5f348e5 2349 add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
1da177e4
LT		 2350}
2351
b71d1d42 2352static void addrconf_add_linklocal(struct inet6_dev *idev, const struct in6_addr *addr)
1da177e4
LT		 2353{
2354 struct inet6_ifaddr * ifp;
95c385b4
NH		 2355 u32 addr_flags = IFA_F_PERMANENT;
2356
2357#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2358 if (idev->cnf.optimistic_dad &&
702beb87 2359 !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
95c385b4
NH		 2360 addr_flags |= IFA_F_OPTIMISTIC;
2361#endif
1da177e4 2362
95c385b4
NH		 2363
2364 ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, addr_flags);
1da177e4 2365 if (!IS_ERR(ifp)) {
46d48046 2366 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
1da177e4
LT		 2367 addrconf_dad_start(ifp, 0);
2368 in6_ifa_put(ifp);
2369 }
2370}
2371
2372static void addrconf_dev_config(struct net_device *dev)
2373{
2374 struct in6_addr addr;
2375 struct inet6_dev * idev;
2376
2377 ASSERT_RTNL();
2378
74235a25
HX		 2379 if ((dev->type != ARPHRD_ETHER) &&
2380 (dev->type != ARPHRD_FDDI) &&
2381 (dev->type != ARPHRD_IEEE802_TR) &&
2382 (dev->type != ARPHRD_ARCNET) &&
2383 (dev->type != ARPHRD_INFINIBAND)) {
2384 /* Alas, we support only Ethernet autoconfiguration. */
2385 return;
2386 }
2387
1da177e4 2388 idev = addrconf_add_dev(dev);
64e724f6 2389 if (IS_ERR(idev))
1da177e4
LT		 2390 return;
2391
2392 memset(&addr, 0, sizeof(struct in6_addr));
2393 addr.s6_addr32[0] = htonl(0xFE800000);
2394
2395 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
2396 addrconf_add_linklocal(idev, &addr);
2397}
2398
0be669bb 2399#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1da177e4
LT		 2400static void addrconf_sit_config(struct net_device *dev)
2401{
2402 struct inet6_dev *idev;
2403
2404 ASSERT_RTNL();
2405
1ab1457c
YH		 2406 /*
2407 * Configure the tunnel with one of our IPv4
2408 * addresses... we should configure all of
1da177e4
LT		 2409 * our v4 addrs in the tunnel
2410 */
2411
2412 if ((idev = ipv6_find_idev(dev)) == NULL) {
2413 printk(KERN_DEBUG "init sit: add_dev failed\n");
2414 return;
2415 }
2416
c7dc89c0
FT		 2417 if (dev->priv_flags & IFF_ISATAP) {
2418 struct in6_addr addr;
2419
2420 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
2421 addrconf_prefix_route(&addr, 64, dev, 0, 0);
2422 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2423 addrconf_add_linklocal(idev, &addr);
2424 return;
2425 }
2426
1da177e4
LT		 2427 sit_add_v4_addrs(idev);
2428
2429 if (dev->flags&IFF_POINTOPOINT) {
2430 addrconf_add_mroute(dev);
2431 addrconf_add_lroute(dev);
2432 } else
2433 sit_route_add(dev);
2434}
0be669bb 2435#endif
1da177e4 2436
aee80b54 2437#if defined(CONFIG_NET_IPGRE) || defined(CONFIG_NET_IPGRE_MODULE)
2438static void addrconf_gre_config(struct net_device *dev)
2439{
2440 struct inet6_dev *idev;
2441 struct in6_addr addr;
2442
2443 pr_info("ipv6: addrconf_gre_config(%s)\n", dev->name);
2444
2445 ASSERT_RTNL();
2446
2447 if ((idev = ipv6_find_idev(dev)) == NULL) {
2448 printk(KERN_DEBUG "init gre: add_dev failed\n");
2449 return;
2450 }
2451
2452 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
2453 addrconf_prefix_route(&addr, 64, dev, 0, 0);
2454
2455 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2456 addrconf_add_linklocal(idev, &addr);
2457}
2458#endif
2459
1da177e4
LT		 2460static inline int
2461ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev)
2462{
2463 struct in6_addr lladdr;
2464
95c385b4 2465 if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) {
1da177e4
LT		 2466 addrconf_add_linklocal(idev, &lladdr);
2467 return 0;
2468 }
2469 return -1;
2470}
2471
2472static void ip6_tnl_add_linklocal(struct inet6_dev *idev)
2473{
2474 struct net_device *link_dev;
c346dca1 2475 struct net *net = dev_net(idev->dev);
1da177e4
LT		 2476
2477 /* first try to inherit the link-local address from the link device */
2478 if (idev->dev->iflink &&
6fda7350 2479 (link_dev = __dev_get_by_index(net, idev->dev->iflink))) {
1da177e4
LT		 2480 if (!ipv6_inherit_linklocal(idev, link_dev))
2481 return;
2482 }
2483 /* then try to inherit it from any device */
6fda7350 2484 for_each_netdev(net, link_dev) {
1da177e4
LT		 2485 if (!ipv6_inherit_linklocal(idev, link_dev))
2486 return;
2487 }
2488 printk(KERN_DEBUG "init ip6-ip6: add_linklocal failed\n");
2489}
2490
2491/*
2492 * Autoconfigure tunnel with a link-local address so routing protocols,
2493 * DHCPv6, MLD etc. can be run over the virtual link
2494 */
2495
2496static void addrconf_ip6_tnl_config(struct net_device *dev)
2497{
2498 struct inet6_dev *idev;
2499
2500 ASSERT_RTNL();
2501
e21e8467 2502 idev = addrconf_add_dev(dev);
64e724f6 2503 if (IS_ERR(idev)) {
1da177e4
LT		 2504 printk(KERN_DEBUG "init ip6-ip6: add_dev failed\n");
2505 return;
2506 }
2507 ip6_tnl_add_linklocal(idev);
1da177e4
LT		 2508}
2509
1ab1457c 2510static int addrconf_notify(struct notifier_block *this, unsigned long event,
1da177e4
LT		 2511 void * data)
2512{
2513 struct net_device *dev = (struct net_device *) data;
74235a25 2514 struct inet6_dev *idev = __in6_dev_get(dev);
c5e33bdd 2515 int run_pending = 0;
b217d616 2516 int err;
1da177e4 2517
e21e8467 2518 switch (event) {
45ba9dd2 2519 case NETDEV_REGISTER:
74235a25 2520 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
45ba9dd2
YH		 2521 idev = ipv6_add_dev(dev);
2522 if (!idev)
b217d616 2523 return notifier_from_errno(-ENOMEM);
45ba9dd2
YH		 2524 }
2525 break;
bcdd553f 2526
1da177e4 2527 case NETDEV_UP:
3c21edbd 2528 case NETDEV_CHANGE:
c2edacf8
JV		 2529 if (dev->flags & IFF_SLAVE)
2530 break;
2531
3c21edbd 2532 if (event == NETDEV_UP) {
f24e3d65 2533 if (!addrconf_qdisc_ok(dev)) {
3c21edbd
YH		 2534 /* device is not ready yet. */
2535 printk(KERN_INFO
2536 "ADDRCONF(NETDEV_UP): %s: "
2537 "link is not ready\n",
2538 dev->name);
2539 break;
2540 }
99081049 2541
d31c7b8f
EP		 2542 if (!idev && dev->mtu >= IPV6_MIN_MTU)
2543 idev = ipv6_add_dev(dev);
2544
e3ec6cfc 2545 if (idev) {
99081049 2546 idev->if_flags |= IF_READY;
e3ec6cfc
BT		 2547 run_pending = 1;
2548 }
3c21edbd 2549 } else {
f24e3d65 2550 if (!addrconf_qdisc_ok(dev)) {
3c21edbd
YH		 2551 /* device is still not ready. */
2552 break;
2553 }
2554
2555 if (idev) {
bcdd553f 2556 if (idev->if_flags & IF_READY)
3c21edbd
YH		 2557 /* device is already configured. */
2558 break;
3c21edbd
YH		 2559 idev->if_flags |= IF_READY;
2560 }
2561
2562 printk(KERN_INFO
2563 "ADDRCONF(NETDEV_CHANGE): %s: "
2564 "link becomes ready\n",
2565 dev->name);
2566
c5e33bdd 2567 run_pending = 1;
3c21edbd
YH		 2568 }
2569
e21e8467 2570 switch (dev->type) {
0be669bb 2571#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1da177e4
LT		 2572 case ARPHRD_SIT:
2573 addrconf_sit_config(dev);
2574 break;
aee80b54 2575#endif
2576#if defined(CONFIG_NET_IPGRE) || defined(CONFIG_NET_IPGRE_MODULE)
2577 case ARPHRD_IPGRE:
2578 addrconf_gre_config(dev);
2579 break;
0be669bb 2580#endif
1da177e4
LT		 2581 case ARPHRD_TUNNEL6:
2582 addrconf_ip6_tnl_config(dev);
2583 break;
2584 case ARPHRD_LOOPBACK:
2585 init_loopback(dev);
2586 break;
2587
2588 default:
2589 addrconf_dev_config(dev);
2590 break;
3ff50b79 2591 }
bcdd553f 2592
1da177e4 2593 if (idev) {
c5e33bdd
YH		 2594 if (run_pending)
2595 addrconf_dad_run(idev);
2596
bcdd553f
SH		 2597 /*
2598 * If the MTU changed during the interface down,
2599 * when the interface up, the changed MTU must be
2600 * reflected in the idev as well as routers.
1da177e4 2601 */
bcdd553f
SH		 2602 if (idev->cnf.mtu6 != dev->mtu &&
2603 dev->mtu >= IPV6_MIN_MTU) {
1da177e4
LT		 2604 rt6_mtu_change(dev, dev->mtu);
2605 idev->cnf.mtu6 = dev->mtu;
2606 }
2607 idev->tstamp = jiffies;
2608 inet6_ifinfo_notify(RTM_NEWLINK, idev);
bcdd553f
SH		 2609
2610 /*
2611 * If the changed mtu during down is lower than
2612 * IPV6_MIN_MTU stop IPv6 on this interface.
1da177e4
LT		 2613 */
2614 if (dev->mtu < IPV6_MIN_MTU)
bcdd553f 2615 addrconf_ifdown(dev, 1);
1da177e4
LT		 2616 }
2617 break;
2618
2619 case NETDEV_CHANGEMTU:
d31c7b8f 2620 if (idev && dev->mtu >= IPV6_MIN_MTU) {
1da177e4
LT		 2621 rt6_mtu_change(dev, dev->mtu);
2622 idev->cnf.mtu6 = dev->mtu;
2623 break;
2624 }
2625
d31c7b8f
EP		 2626 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2627 idev = ipv6_add_dev(dev);
2628 if (idev)
2629 break;
2630 }
2631
bcdd553f
SH		 2632 /*
2633 * MTU falled under IPV6_MIN_MTU.
2634 * Stop IPv6 on this interface.
2635 */
1da177e4
LT		 2636
2637 case NETDEV_DOWN:
2638 case NETDEV_UNREGISTER:
2639 /*
2640 * Remove all addresses from this interface.
2641 */
2642 addrconf_ifdown(dev, event != NETDEV_DOWN);
2643 break;
3c21edbd 2644
1da177e4 2645 case NETDEV_CHANGENAME:
1da177e4 2646 if (idev) {
5632c515 2647 snmp6_unregister_dev(idev);
408c4768 2648 addrconf_sysctl_unregister(idev);
f52295a9 2649 addrconf_sysctl_register(idev);
b217d616
HX		 2650 err = snmp6_register_dev(idev);
2651 if (err)
2652 return notifier_from_errno(err);
5632c515 2653 }
1da177e4 2654 break;
bcdd553f 2655
93d9b7d7
JP		 2656 case NETDEV_PRE_TYPE_CHANGE:
2657 case NETDEV_POST_TYPE_CHANGE:
2658 addrconf_type_change(dev, event);
75c78500 2659 break;
3ff50b79 2660 }
1da177e4
LT		 2661
2662 return NOTIFY_OK;
2663}
2664
2665/*
2666 * addrconf module should be notified of a device going up
2667 */
2668static struct notifier_block ipv6_dev_notf = {
2669 .notifier_call = addrconf_notify,
1da177e4
LT		 2670};
2671
93d9b7d7 2672static void addrconf_type_change(struct net_device *dev, unsigned long event)
75c78500
MS		 2673{
2674 struct inet6_dev *idev;
2675 ASSERT_RTNL();
2676
2677 idev = __in6_dev_get(dev);
2678
93d9b7d7 2679 if (event == NETDEV_POST_TYPE_CHANGE)
75c78500 2680 ipv6_mc_remap(idev);
93d9b7d7 2681 else if (event == NETDEV_PRE_TYPE_CHANGE)
75c78500
MS		 2682 ipv6_mc_unmap(idev);
2683}
2684
1da177e4
LT		 2685static int addrconf_ifdown(struct net_device *dev, int how)
2686{
c346dca1 2687 struct net *net = dev_net(dev);
502a2ffd 2688 struct inet6_dev *idev;
2689 struct inet6_ifaddr *ifa;
73a8bd74 2690 int state, i;
1da177e4
LT		 2691
2692 ASSERT_RTNL();
2693
73a8bd74
DM		 2694 rt6_ifdown(net, dev);
2695 neigh_ifdown(&nd_tbl, dev);
1da177e4
LT		 2696
2697 idev = __in6_dev_get(dev);
2698 if (idev == NULL)
2699 return -ENODEV;
2700
bcdd553f
SH		 2701 /*
2702 * Step 1: remove reference to ipv6 device from parent device.
2703 * Do not dev_put!
1da177e4 2704 */
439e2385 2705 if (how) {
1da177e4 2706 idev->dead = 1;
8814c4b5
YH		 2707
2708 /* protected by rtnl_lock */
2709 rcu_assign_pointer(dev->ip6_ptr, NULL);
1da177e4
LT		 2710
2711 /* Step 1.5: remove snmp6 entry */
2712 snmp6_unregister_dev(idev);
2713
2714 }
2715
73a8bd74
DM		 2716 /* Step 2: clear hash table */
2717 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
2718 struct hlist_head *h = &inet6_addr_lst[i];
2719 struct hlist_node *n;
2720
2721 spin_lock_bh(&addrconf_hash_lock);
2722 restart:
2723 hlist_for_each_entry_rcu(ifa, n, h, addr_lst) {
2724 if (ifa->idev == idev) {
2725 hlist_del_init_rcu(&ifa->addr_lst);
2726 addrconf_del_timer(ifa);
2727 goto restart;
2728 }
2729 }
2730 spin_unlock_bh(&addrconf_hash_lock);
2731 }
2732
1da177e4
LT		 2733 write_lock_bh(&idev->lock);
2734
bcdd553f 2735 /* Step 2: clear flags for stateless addrconf */
439e2385 2736 if (!how)
3c21edbd 2737 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
1da177e4 2738
1da177e4 2739#ifdef CONFIG_IPV6_PRIVACY
439e2385 2740 if (how && del_timer(&idev->regen_timer))
1da177e4
LT		 2741 in6_dev_put(idev);
2742
bcdd553f 2743 /* Step 3: clear tempaddr list */
372e6c8f 2744 while (!list_empty(&idev->tempaddr_list)) {
2745 ifa = list_first_entry(&idev->tempaddr_list,
2746 struct inet6_ifaddr, tmp_list);
2747 list_del(&ifa->tmp_list);
1da177e4
LT		 2748 write_unlock_bh(&idev->lock);
2749 spin_lock_bh(&ifa->lock);
2750
2751 if (ifa->ifpub) {
2752 in6_ifa_put(ifa->ifpub);
2753 ifa->ifpub = NULL;
2754 }
2755 spin_unlock_bh(&ifa->lock);
2756 in6_ifa_put(ifa);
2757 write_lock_bh(&idev->lock);
2758 }
2759#endif
8f37ada5 2760
502a2ffd 2761 while (!list_empty(&idev->addr_list)) {
2762 ifa = list_first_entry(&idev->addr_list,
2763 struct inet6_ifaddr, if_list);
84e8b803 2764 addrconf_del_timer(ifa);
2765
73a8bd74 2766 list_del(&ifa->if_list);
84e8b803 2767
73a8bd74 2768 write_unlock_bh(&idev->lock);
84e8b803 2769
73a8bd74
DM		 2770 spin_lock_bh(&ifa->state_lock);
2771 state = ifa->state;
2772 ifa->state = INET6_IFADDR_STATE_DEAD;
2773 spin_unlock_bh(&ifa->state_lock);
9d82ca98 2774
73a8bd74
DM		 2775 if (state != INET6_IFADDR_STATE_DEAD) {
2776 __ipv6_ifa_notify(RTM_DELADDR, ifa);
2777 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifa);
27bdb2ab 2778 }
73a8bd74 2779 in6_ifa_put(ifa);
8f37ada5 2780
73a8bd74
DM		 2781 write_lock_bh(&idev->lock);
2782 }
8f37ada5 2783
1da177e4
LT		 2784 write_unlock_bh(&idev->lock);
2785
2786 /* Step 5: Discard multicast list */
439e2385 2787 if (how)
1da177e4
LT		 2788 ipv6_mc_destroy_dev(idev);
2789 else
2790 ipv6_mc_down(idev);
2791
1da177e4 2792 idev->tstamp = jiffies;
1ab1457c 2793
bcdd553f 2794 /* Last: Shot the device (if unregistered) */
439e2385 2795 if (how) {
408c4768 2796 addrconf_sysctl_unregister(idev);
1da177e4
LT		 2797 neigh_parms_release(&nd_tbl, idev->nd_parms);
2798 neigh_ifdown(&nd_tbl, dev);
2799 in6_dev_put(idev);
2800 }
2801 return 0;
2802}
2803
2804static void addrconf_rs_timer(unsigned long data)
2805{
2806 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
5b2a1953 2807 struct inet6_dev *idev = ifp->idev;
1da177e4 2808
5b2a1953 2809 read_lock(&idev->lock);
2810 if (idev->dead || !(idev->if_flags & IF_READY))
1da177e4
LT		 2811 goto out;
2812
5b2a1953 2813 if (idev->cnf.forwarding)
2814 goto out;
2815
2816 /* Announcement received after solicitation was sent */
2817 if (idev->if_flags & IF_RA_RCVD)
1da177e4 2818 goto out;
1da177e4
LT		 2819
2820 spin_lock(&ifp->lock);
5b2a1953 2821 if (ifp->probes++ < idev->cnf.rtr_solicits) {
1da177e4
LT		 2822 /* The wait after the last probe can be shorter */
2823 addrconf_mod_timer(ifp, AC_RS,
5b2a1953 2824 (ifp->probes == idev->cnf.rtr_solicits) ?
2825 idev->cnf.rtr_solicit_delay :
2826 idev->cnf.rtr_solicit_interval);
1da177e4
LT		 2827 spin_unlock(&ifp->lock);
2828
5b2a1953 2829 ndisc_send_rs(idev->dev, &ifp->addr, &in6addr_linklocal_allrouters);
1da177e4
LT		 2830 } else {
2831 spin_unlock(&ifp->lock);
2832 /*
2833 * Note: we do not support deprecated "all on-link"
2834 * assumption any longer.
2835 */
2836 printk(KERN_DEBUG "%s: no IPv6 routers present\n",
5b2a1953 2837 idev->dev->name);
1da177e4
LT		 2838 }
2839
2840out:
5b2a1953 2841 read_unlock(&idev->lock);
1da177e4
LT		 2842 in6_ifa_put(ifp);
2843}
2844
2845/*
2846 * Duplicate Address Detection
2847 */
3c21edbd
YH		 2848static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
2849{
2850 unsigned long rand_num;
2851 struct inet6_dev *idev = ifp->idev;
2852
95c385b4
NH		 2853 if (ifp->flags & IFA_F_OPTIMISTIC)
2854 rand_num = 0;
2855 else
2856 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1);
2857
3c21edbd
YH		 2858 ifp->probes = idev->cnf.dad_transmits;
2859 addrconf_mod_timer(ifp, AC_DAD, rand_num);
2860}
2861
e431b8c0 2862static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags)
1da177e4
LT		 2863{
2864 struct inet6_dev *idev = ifp->idev;
2865 struct net_device *dev = idev->dev;
1da177e4
LT		 2866
2867 addrconf_join_solict(dev, &ifp->addr);
2868
1da177e4 2869 net_srandom(ifp->addr.s6_addr32[3]);
1da177e4
LT		 2870
2871 read_lock_bh(&idev->lock);
622ccdf1 2872 spin_lock(&ifp->lock);
e9d3e084 2873 if (ifp->state == INET6_IFADDR_STATE_DEAD)
1da177e4 2874 goto out;
1da177e4
LT		 2875
2876 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
1b34be74 2877 idev->cnf.accept_dad < 1 ||
55ebaef1
NT		 2878 !(ifp->flags&IFA_F_TENTATIVE) ||
2879 ifp->flags & IFA_F_NODAD) {
cc411d0b 2880 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
21809faf 2881 spin_unlock(&ifp->lock);
1da177e4
LT		 2882 read_unlock_bh(&idev->lock);
2883
2884 addrconf_dad_completed(ifp);
2885 return;
2886 }
2887
6732bade 2888 if (!(idev->if_flags & IF_READY)) {
21809faf 2889 spin_unlock(&ifp->lock);
6732bade 2890 read_unlock_bh(&idev->lock);
3c21edbd 2891 /*
590a9887 2892 * If the device is not ready:
3c21edbd
YH		 2893 * - keep it tentative if it is a permanent address.
2894 * - otherwise, kill it.
2895 */
2896 in6_ifa_hold(ifp);
cc411d0b 2897 addrconf_dad_stop(ifp, 0);
6732bade 2898 return;
3c21edbd 2899 }
95c385b4
NH		 2900
2901 /*
2902 * Optimistic nodes can start receiving
2903 * Frames right away
2904 */
e21e8467 2905 if (ifp->flags & IFA_F_OPTIMISTIC)
95c385b4
NH		 2906 ip6_ins_rt(ifp->rt);
2907
6732bade 2908 addrconf_dad_kick(ifp);
1da177e4 2909out:
622ccdf1 2910 spin_unlock(&ifp->lock);
1da177e4
LT		 2911 read_unlock_bh(&idev->lock);
2912}
2913
2914static void addrconf_dad_timer(unsigned long data)
2915{
2916 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2917 struct inet6_dev *idev = ifp->idev;
1da177e4
LT		 2918 struct in6_addr mcaddr;
2919
f2344a13
HX		 2920 if (!ifp->probes && addrconf_dad_end(ifp))
2921 goto out;
2922
122e4519 2923 read_lock(&idev->lock);
2924 if (idev->dead || !(idev->if_flags & IF_READY)) {
2925 read_unlock(&idev->lock);
1da177e4
LT		 2926 goto out;
2927 }
21809faf 2928
2929 spin_lock(&ifp->lock);
622ccdf1
HX		 2930 if (ifp->state == INET6_IFADDR_STATE_DEAD) {
2931 spin_unlock(&ifp->lock);
2932 read_unlock(&idev->lock);
2933 goto out;
2934 }
2935
1da177e4
LT		 2936 if (ifp->probes == 0) {
2937 /*
2938 * DAD was successful
2939 */
2940
cc411d0b 2941 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
21809faf 2942 spin_unlock(&ifp->lock);
122e4519 2943 read_unlock(&idev->lock);
1da177e4
LT		 2944
2945 addrconf_dad_completed(ifp);
2946
2947 goto out;
2948 }
2949
2950 ifp->probes--;
2951 addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time);
21809faf 2952 spin_unlock(&ifp->lock);
122e4519 2953 read_unlock(&idev->lock);
1da177e4
LT		 2954
2955 /* send a neighbour solicitation for our addr */
1da177e4 2956 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
d7aabf22 2957 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &in6addr_any);
1da177e4
LT		 2958out:
2959 in6_ifa_put(ifp);
2960}
2961
2962static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
2963{
e21e8467 2964 struct net_device *dev = ifp->idev->dev;
1da177e4
LT		 2965
2966 /*
2967 * Configure the address for reception. Now it is valid.
2968 */
2969
2970 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2971
2972 /* If added prefix is link local and forwarding is off,
2973 start sending router solicitations.
2974 */
2975
c3bccac2
TG		 2976 if ((ifp->idev->cnf.forwarding == 0 ||
2977 ifp->idev->cnf.forwarding == 2) &&
1da177e4
LT		 2978 ifp->idev->cnf.rtr_solicits > 0 &&
2979 (dev->flags&IFF_LOOPBACK) == 0 &&
2980 (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) {
1da177e4
LT		 2981 /*
2982 * If a host as already performed a random delay
2983 * [...] as part of DAD [...] there is no need
2984 * to delay again before sending the first RS
2985 */
f3ee4010 2986 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &in6addr_linklocal_allrouters);
1da177e4
LT		 2987
2988 spin_lock_bh(&ifp->lock);
2989 ifp->probes = 1;
2990 ifp->idev->if_flags |= IF_RS_SENT;
2991 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval);
2992 spin_unlock_bh(&ifp->lock);
2993 }
2994}
2995
e21e8467
SH		 2996static void addrconf_dad_run(struct inet6_dev *idev)
2997{
c5e33bdd
YH		 2998 struct inet6_ifaddr *ifp;
2999
3000 read_lock_bh(&idev->lock);
502a2ffd 3001 list_for_each_entry(ifp, &idev->addr_list, if_list) {
21809faf 3002 spin_lock(&ifp->lock);
f2344a13
HX		 3003 if (ifp->flags & IFA_F_TENTATIVE &&
3004 ifp->state == INET6_IFADDR_STATE_DAD)
3005 addrconf_dad_kick(ifp);
21809faf 3006 spin_unlock(&ifp->lock);
c5e33bdd
YH		 3007 }
3008 read_unlock_bh(&idev->lock);
3009}
3010
1da177e4
LT		 3011#ifdef CONFIG_PROC_FS
3012struct if6_iter_state {
3c40090a 3013 struct seq_net_private p;
1da177e4
LT		 3014 int bucket;
3015};
3016
3017static struct inet6_ifaddr *if6_get_first(struct seq_file *seq)
3018{
3019 struct inet6_ifaddr *ifa = NULL;
3020 struct if6_iter_state *state = seq->private;
1218854a 3021 struct net *net = seq_file_net(seq);
1da177e4
LT		 3022
3023 for (state->bucket = 0; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
c2e21293 3024 struct hlist_node *n;
4f70ecca 3025 hlist_for_each_entry_rcu_bh(ifa, n, &inet6_addr_lst[state->bucket],
5c578aed 3026 addr_lst)
c2e21293 3027 if (net_eq(dev_net(ifa->idev->dev), net))
3028 return ifa;
1da177e4 3029 }
c2e21293 3030 return NULL;
1da177e4
LT		 3031}
3032
c2e21293 3033static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
3034 struct inet6_ifaddr *ifa)
1da177e4
LT		 3035{
3036 struct if6_iter_state *state = seq->private;
1218854a 3037 struct net *net = seq_file_net(seq);
c2e21293 3038 struct hlist_node *n = &ifa->addr_lst;
1da177e4 3039
4f70ecca 3040 hlist_for_each_entry_continue_rcu_bh(ifa, n, addr_lst)
c2e21293 3041 if (net_eq(dev_net(ifa->idev->dev), net))
3042 return ifa;
3c40090a 3043
c2e21293 3044 while (++state->bucket < IN6_ADDR_HSIZE) {
4f70ecca 3045 hlist_for_each_entry_rcu_bh(ifa, n,
c2e21293 3046 &inet6_addr_lst[state->bucket], addr_lst) {
3047 if (net_eq(dev_net(ifa->idev->dev), net))
3048 return ifa;
3049 }
1da177e4 3050 }
3c40090a 3051
c2e21293 3052 return NULL;
1da177e4
LT		 3053}
3054
3055static struct inet6_ifaddr *if6_get_idx(struct seq_file *seq, loff_t pos)
3056{
3057 struct inet6_ifaddr *ifa = if6_get_first(seq);
3058
3059 if (ifa)
e21e8467 3060 while (pos && (ifa = if6_get_next(seq, ifa)) != NULL)
1da177e4
LT		 3061 --pos;
3062 return pos ? NULL : ifa;
3063}
3064
3065static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
4f70ecca 3066 __acquires(rcu_bh)
1da177e4 3067{
5c578aed 3068 rcu_read_lock_bh();
1da177e4
LT		 3069 return if6_get_idx(seq, *pos);
3070}
3071
3072static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3073{
3074 struct inet6_ifaddr *ifa;
3075
3076 ifa = if6_get_next(seq, v);
3077 ++*pos;
3078 return ifa;
3079}
3080
3081static void if6_seq_stop(struct seq_file *seq, void *v)
4f70ecca 3082 __releases(rcu_bh)
1da177e4 3083{
5c578aed 3084 rcu_read_unlock_bh();
1da177e4
LT		 3085}
3086
3087static int if6_seq_show(struct seq_file *seq, void *v)
3088{
3089 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
4b7a4274 3090 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
b071195d 3091 &ifp->addr,
1da177e4
LT		 3092 ifp->idev->dev->ifindex,
3093 ifp->prefix_len,
3094 ifp->scope,
3095 ifp->flags,
3096 ifp->idev->dev->name);
3097 return 0;
3098}
3099
56b3d975 3100static const struct seq_operations if6_seq_ops = {
1da177e4
LT		 3101 .start = if6_seq_start,
3102 .next = if6_seq_next,
3103 .show = if6_seq_show,
3104 .stop = if6_seq_stop,
3105};
3106
3107static int if6_seq_open(struct inode *inode, struct file *file)
3108{
3c40090a
DL		 3109 return seq_open_net(inode, file, &if6_seq_ops,
3110 sizeof(struct if6_iter_state));
1da177e4
LT		 3111}
3112
9a32144e 3113static const struct file_operations if6_fops = {
1da177e4
LT		 3114 .owner = THIS_MODULE,
3115 .open = if6_seq_open,
3116 .read = seq_read,
3117 .llseek = seq_lseek,
3c40090a 3118 .release = seq_release_net,
1da177e4
LT		 3119};
3120
2c8c1e72 3121static int __net_init if6_proc_net_init(struct net *net)
1da177e4 3122{
3c40090a 3123 if (!proc_net_fops_create(net, "if_inet6", S_IRUGO, &if6_fops))
1da177e4
LT		 3124 return -ENOMEM;
3125 return 0;
3126}
3127
2c8c1e72 3128static void __net_exit if6_proc_net_exit(struct net *net)
3c40090a
DL		 3129{
3130 proc_net_remove(net, "if_inet6");
3131}
3132
3133static struct pernet_operations if6_proc_net_ops = {
3134 .init = if6_proc_net_init,
3135 .exit = if6_proc_net_exit,
3136};
3137
3138int __init if6_proc_init(void)
3139{
3140 return register_pernet_subsys(&if6_proc_net_ops);
3141}
3142
1da177e4
LT		 3143void if6_proc_exit(void)
3144{
3c40090a 3145 unregister_pernet_subsys(&if6_proc_net_ops);
1da177e4
LT		 3146}
3147#endif /* CONFIG_PROC_FS */
3148
59fbb3a6 3149#if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
3b9f9a1c 3150/* Check if address is a home address configured on any interface. */
b71d1d42 3151int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr)
3b9f9a1c
NT		 3152{
3153 int ret = 0;
c2e21293 3154 struct inet6_ifaddr *ifp = NULL;
3155 struct hlist_node *n;
3a88a81d 3156 unsigned int hash = ipv6_addr_hash(addr);
c2e21293 3157
5c578aed 3158 rcu_read_lock_bh();
4f70ecca 3159 hlist_for_each_entry_rcu_bh(ifp, n, &inet6_addr_lst[hash], addr_lst) {
878628fb 3160 if (!net_eq(dev_net(ifp->idev->dev), net))
389f6612 3161 continue;
caad295f 3162 if (ipv6_addr_equal(&ifp->addr, addr) &&
3b9f9a1c
NT		 3163 (ifp->flags & IFA_F_HOMEADDRESS)) {
3164 ret = 1;
3165 break;
3166 }
3167 }
5c578aed 3168 rcu_read_unlock_bh();
3b9f9a1c
NT		 3169 return ret;
3170}
3171#endif
3172
1da177e4
LT		 3173/*
3174 * Periodic address status verification
3175 */
3176
3177static void addrconf_verify(unsigned long foo)
3178{
b2db7564 3179 unsigned long now, next, next_sec, next_sched;
1da177e4 3180 struct inet6_ifaddr *ifp;
c2e21293 3181 struct hlist_node *node;
1da177e4
LT		 3182 int i;
3183
5c578aed 3184 rcu_read_lock_bh();
3185 spin_lock(&addrconf_verify_lock);
1da177e4 3186 now = jiffies;
b2db7564 3187 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
1da177e4
LT		 3188
3189 del_timer(&addr_chk_timer);
3190
bcdd553f 3191 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
1da177e4 3192restart:
4f70ecca 3193 hlist_for_each_entry_rcu_bh(ifp, node,
5c578aed 3194 &inet6_addr_lst[i], addr_lst) {
1da177e4 3195 unsigned long age;
1da177e4
LT		 3196
3197 if (ifp->flags & IFA_F_PERMANENT)
3198 continue;
3199
3200 spin_lock(&ifp->lock);
b2db7564
YH		 3201 /* We try to batch several events at once. */
3202 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
1da177e4 3203
8f27ebb9
YH		 3204 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
3205 age >= ifp->valid_lft) {
1da177e4
LT		 3206 spin_unlock(&ifp->lock);
3207 in6_ifa_hold(ifp);
1da177e4
LT		 3208 ipv6_del_addr(ifp);
3209 goto restart;
8f27ebb9
YH		 3210 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
3211 spin_unlock(&ifp->lock);
3212 continue;
1da177e4 3213 } else if (age >= ifp->prefered_lft) {
a1ed0526 3214 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
1da177e4
LT		 3215 int deprecate = 0;
3216
3217 if (!(ifp->flags&IFA_F_DEPRECATED)) {
3218 deprecate = 1;
3219 ifp->flags |= IFA_F_DEPRECATED;
3220 }
3221
3222 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))
3223 next = ifp->tstamp + ifp->valid_lft * HZ;
3224
3225 spin_unlock(&ifp->lock);
3226
3227 if (deprecate) {
3228 in6_ifa_hold(ifp);
1da177e4
LT		 3229
3230 ipv6_ifa_notify(0, ifp);
3231 in6_ifa_put(ifp);
3232 goto restart;
3233 }
3234#ifdef CONFIG_IPV6_PRIVACY
3235 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
3236 !(ifp->flags&IFA_F_TENTATIVE)) {
88949cf4 3237 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
3238 ifp->idev->cnf.dad_transmits *
3239 ifp->idev->nd_parms->retrans_time / HZ;
3240
1da177e4
LT		 3241 if (age >= ifp->prefered_lft - regen_advance) {
3242 struct inet6_ifaddr *ifpub = ifp->ifpub;
3243 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3244 next = ifp->tstamp + ifp->prefered_lft * HZ;
3245 if (!ifp->regen_count && ifpub) {
3246 ifp->regen_count++;
3247 in6_ifa_hold(ifp);
3248 in6_ifa_hold(ifpub);
3249 spin_unlock(&ifp->lock);
5c578aed 3250
291d809b
HY		 3251 spin_lock(&ifpub->lock);
3252 ifpub->regen_count = 0;
3253 spin_unlock(&ifpub->lock);
1da177e4
LT		 3254 ipv6_create_tempaddr(ifpub, ifp);
3255 in6_ifa_put(ifpub);
3256 in6_ifa_put(ifp);
3257 goto restart;
3258 }
3259 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
3260 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
3261 spin_unlock(&ifp->lock);
3262#endif
3263 } else {
3264 /* ifp->prefered_lft <= ifp->valid_lft */
3265 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3266 next = ifp->tstamp + ifp->prefered_lft * HZ;
3267 spin_unlock(&ifp->lock);
3268 }
3269 }
1da177e4
LT		 3270 }
3271
b2db7564
YH		 3272 next_sec = round_jiffies_up(next);
3273 next_sched = next;
3274
3275 /* If rounded timeout is accurate enough, accept it. */
3276 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
3277 next_sched = next_sec;
3278
3279 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
3280 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
3281 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
3282
3283 ADBG((KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
3284 now, next, next_sec, next_sched));
3285
3286 addr_chk_timer.expires = next_sched;
1da177e4 3287 add_timer(&addr_chk_timer);
5c578aed 3288 spin_unlock(&addrconf_verify_lock);
3289 rcu_read_unlock_bh();
1da177e4
LT		 3290}
3291
461d8837
TG		 3292static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local)
3293{
3294 struct in6_addr *pfx = NULL;
3295
3296 if (addr)
3297 pfx = nla_data(addr);
3298
3299 if (local) {
3300 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
3301 pfx = NULL;
3302 else
3303 pfx = nla_data(local);
3304 }
3305
3306 return pfx;
3307}
3308
ef7c79ed 3309static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
461d8837
TG		 3310 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
3311 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
3312 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
3313};
3314
1da177e4
LT		 3315static int
3316inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3317{
3b1e0a65 3318 struct net *net = sock_net(skb->sk);
b933f716
TG		 3319 struct ifaddrmsg *ifm;
3320 struct nlattr *tb[IFA_MAX+1];
1da177e4 3321 struct in6_addr *pfx;
b933f716 3322 int err;
1da177e4 3323
b933f716
TG		 3324 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3325 if (err < 0)
3326 return err;
3327
3328 ifm = nlmsg_data(nlh);
3329 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
1da177e4
LT		 3330 if (pfx == NULL)
3331 return -EINVAL;
3332
af284937 3333 return inet6_addr_del(net, ifm->ifa_index, pfx, ifm->ifa_prefixlen);
1da177e4
LT		 3334}
3335
55ebaef1
NT		 3336static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags,
3337 u32 prefered_lft, u32 valid_lft)
081bba5b 3338{
6f704992
YH		 3339 u32 flags;
3340 clock_t expires;
4bed72e4 3341 unsigned long timeout;
46d48046 3342
081bba5b
NT		 3343 if (!valid_lft || (prefered_lft > valid_lft))
3344 return -EINVAL;
3345
4bed72e4
YH		 3346 timeout = addrconf_timeout_fixup(valid_lft, HZ);
3347 if (addrconf_finite_timeout(timeout)) {
3348 expires = jiffies_to_clock_t(timeout * HZ);
3349 valid_lft = timeout;
6f704992 3350 flags = RTF_EXPIRES;
4bed72e4
YH		 3351 } else {
3352 expires = 0;
3353 flags = 0;
3354 ifa_flags |= IFA_F_PERMANENT;
6f704992 3355 }
081bba5b 3356
4bed72e4
YH		 3357 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
3358 if (addrconf_finite_timeout(timeout)) {
3359 if (timeout == 0)
3360 ifa_flags |= IFA_F_DEPRECATED;
3361 prefered_lft = timeout;
3362 }
081bba5b
NT		 3363
3364 spin_lock_bh(&ifp->lock);
3b9f9a1c 3365 ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags;
081bba5b
NT		 3366 ifp->tstamp = jiffies;
3367 ifp->valid_lft = valid_lft;
3368 ifp->prefered_lft = prefered_lft;
3369
3370 spin_unlock_bh(&ifp->lock);
3371 if (!(ifp->flags&IFA_F_TENTATIVE))
3372 ipv6_ifa_notify(0, ifp);
081bba5b 3373
46d48046 3374 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
6f704992 3375 expires, flags);
081bba5b
NT		 3376 addrconf_verify(0);
3377
3378 return 0;
3379}
3380
1da177e4
LT		 3381static int
3382inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3383{
3b1e0a65 3384 struct net *net = sock_net(skb->sk);
461d8837
TG		 3385 struct ifaddrmsg *ifm;
3386 struct nlattr *tb[IFA_MAX+1];
1da177e4 3387 struct in6_addr *pfx;
7198f8ce
TG		 3388 struct inet6_ifaddr *ifa;
3389 struct net_device *dev;
55ebaef1
NT		 3390 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
3391 u8 ifa_flags;
461d8837 3392 int err;
1da177e4 3393
461d8837
TG		 3394 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3395 if (err < 0)
3396 return err;
3397
3398 ifm = nlmsg_data(nlh);
3399 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
1da177e4
LT		 3400 if (pfx == NULL)
3401 return -EINVAL;
3402
461d8837 3403 if (tb[IFA_CACHEINFO]) {
0778769d 3404 struct ifa_cacheinfo *ci;
461d8837
TG		 3405
3406 ci = nla_data(tb[IFA_CACHEINFO]);
0778769d 3407 valid_lft = ci->ifa_valid;
461d8837
TG		 3408 preferred_lft = ci->ifa_prefered;
3409 } else {
3410 preferred_lft = INFINITY_LIFE_TIME;
3411 valid_lft = INFINITY_LIFE_TIME;
0778769d
NT		 3412 }
3413
af284937 3414 dev = __dev_get_by_index(net, ifm->ifa_index);
7198f8ce
TG		 3415 if (dev == NULL)
3416 return -ENODEV;
3417
55ebaef1 3418 /* We ignore other flags so far. */
3b9f9a1c 3419 ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS);
55ebaef1 3420
1cab3da6 3421 ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
7198f8ce
TG		 3422 if (ifa == NULL) {
3423 /*
3424 * It would be best to check for !NLM_F_CREATE here but
3425 * userspace alreay relies on not having to provide this.
3426 */
af284937
DL		 3427 return inet6_addr_add(net, ifm->ifa_index, pfx,
3428 ifm->ifa_prefixlen, ifa_flags,
3429 preferred_lft, valid_lft);
081bba5b
NT		 3430 }
3431
7198f8ce
TG		 3432 if (nlh->nlmsg_flags & NLM_F_EXCL ||
3433 !(nlh->nlmsg_flags & NLM_F_REPLACE))
3434 err = -EEXIST;
3435 else
55ebaef1 3436 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
7198f8ce
TG		 3437
3438 in6_ifa_put(ifa);
3439
3440 return err;
1da177e4
LT		 3441}
3442
101bb229
TG		 3443static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags,
3444 u8 scope, int ifindex)
3445{
3446 struct ifaddrmsg *ifm;
3447
3448 ifm = nlmsg_data(nlh);
3449 ifm->ifa_family = AF_INET6;
3450 ifm->ifa_prefixlen = prefixlen;
3451 ifm->ifa_flags = flags;
3452 ifm->ifa_scope = scope;
3453 ifm->ifa_index = ifindex;
3454}
3455
85486af0
TG		 3456static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
3457 unsigned long tstamp, u32 preferred, u32 valid)
3458{
3459 struct ifa_cacheinfo ci;
3460
18a31e1e
TG		 3461 ci.cstamp = cstamp_delta(cstamp);
3462 ci.tstamp = cstamp_delta(tstamp);
85486af0
TG		 3463 ci.ifa_prefered = preferred;
3464 ci.ifa_valid = valid;
3465
3466 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
3467}
3468
101bb229
TG		 3469static inline int rt_scope(int ifa_scope)
3470{
3471 if (ifa_scope & IFA_HOST)
3472 return RT_SCOPE_HOST;
3473 else if (ifa_scope & IFA_LINK)
3474 return RT_SCOPE_LINK;
3475 else if (ifa_scope & IFA_SITE)
3476 return RT_SCOPE_SITE;
3477 else
3478 return RT_SCOPE_UNIVERSE;
3479}
3480
0ab6803b
TG		 3481static inline int inet6_ifaddr_msgsize(void)
3482{
339bf98f
TG		 3483 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
3484 + nla_total_size(16) /* IFA_ADDRESS */
3485 + nla_total_size(sizeof(struct ifa_cacheinfo));
0ab6803b 3486}
c5396a31 3487
1da177e4 3488static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
b6544c0b 3489 u32 pid, u32 seq, int event, unsigned int flags)
1da177e4 3490{
1da177e4 3491 struct nlmsghdr *nlh;
85486af0 3492 u32 preferred, valid;
1da177e4 3493
0ab6803b
TG		 3494 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3495 if (nlh == NULL)
26932566 3496 return -EMSGSIZE;
0ab6803b 3497
101bb229
TG		 3498 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
3499 ifa->idev->dev->ifindex);
3500
1da177e4 3501 if (!(ifa->flags&IFA_F_PERMANENT)) {
85486af0
TG		 3502 preferred = ifa->prefered_lft;
3503 valid = ifa->valid_lft;
3504 if (preferred != INFINITY_LIFE_TIME) {
1da177e4 3505 long tval = (jiffies - ifa->tstamp)/HZ;
a1faa698
JR		 3506 if (preferred > tval)
3507 preferred -= tval;
3508 else
3509 preferred = 0;
f56619fc
BH		 3510 if (valid != INFINITY_LIFE_TIME) {
3511 if (valid > tval)
3512 valid -= tval;
3513 else
3514 valid = 0;
3515 }
1da177e4
LT		 3516 }
3517 } else {
85486af0
TG		 3518 preferred = INFINITY_LIFE_TIME;
3519 valid = INFINITY_LIFE_TIME;
3520 }
3521
0ab6803b 3522 if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0 ||
26932566
PM		 3523 put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) {
3524 nlmsg_cancel(skb, nlh);
3525 return -EMSGSIZE;
3526 }
1da177e4 3527
0ab6803b 3528 return nlmsg_end(skb, nlh);
1da177e4
LT		 3529}
3530
3531static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
e431b8c0 3532 u32 pid, u32 seq, int event, u16 flags)
1da177e4 3533{
1da177e4 3534 struct nlmsghdr *nlh;
101bb229
TG		 3535 u8 scope = RT_SCOPE_UNIVERSE;
3536 int ifindex = ifmca->idev->dev->ifindex;
3537
3538 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
3539 scope = RT_SCOPE_SITE;
1da177e4 3540
0ab6803b
TG		 3541 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3542 if (nlh == NULL)
26932566 3543 return -EMSGSIZE;
85486af0 3544
0ab6803b
TG		 3545 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3546 if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 ||
3547 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
26932566
PM		 3548 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3549 nlmsg_cancel(skb, nlh);
3550 return -EMSGSIZE;
3551 }
85486af0 3552
0ab6803b 3553 return nlmsg_end(skb, nlh);
1da177e4
LT		 3554}
3555
3556static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
b6544c0b 3557 u32 pid, u32 seq, int event, unsigned int flags)
1da177e4 3558{
1da177e4 3559 struct nlmsghdr *nlh;
101bb229
TG		 3560 u8 scope = RT_SCOPE_UNIVERSE;
3561 int ifindex = ifaca->aca_idev->dev->ifindex;
3562
3563 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
3564 scope = RT_SCOPE_SITE;
1da177e4 3565
0ab6803b
TG		 3566 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3567 if (nlh == NULL)
26932566 3568 return -EMSGSIZE;
85486af0 3569
0ab6803b
TG		 3570 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3571 if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 ||
3572 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
26932566
PM		 3573 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3574 nlmsg_cancel(skb, nlh);
3575 return -EMSGSIZE;
3576 }
1da177e4 3577
0ab6803b 3578 return nlmsg_end(skb, nlh);
1da177e4
LT		 3579}
3580
e21e8467 3581enum addr_type_t {
1da177e4
LT		 3582 UNICAST_ADDR,
3583 MULTICAST_ADDR,
3584 ANYCAST_ADDR,
3585};
3586
234b27c3
ED		 3587/* called with rcu_read_lock() */
3588static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
3589 struct netlink_callback *cb, enum addr_type_t type,
3590 int s_ip_idx, int *p_ip_idx)
3591{
234b27c3
ED		 3592 struct ifmcaddr6 *ifmca;
3593 struct ifacaddr6 *ifaca;
3594 int err = 1;
3595 int ip_idx = *p_ip_idx;
3596
3597 read_lock_bh(&idev->lock);
3598 switch (type) {
502a2ffd 3599 case UNICAST_ADDR: {
3600 struct inet6_ifaddr *ifa;
3601
234b27c3 3602 /* unicast address incl. temp addr */
502a2ffd 3603 list_for_each_entry(ifa, &idev->addr_list, if_list) {
3604 if (++ip_idx < s_ip_idx)
234b27c3
ED		 3605 continue;
3606 err = inet6_fill_ifaddr(skb, ifa,
3607 NETLINK_CB(cb->skb).pid,
3608 cb->nlh->nlmsg_seq,
3609 RTM_NEWADDR,
3610 NLM_F_MULTI);
3611 if (err <= 0)
3612 break;
3613 }
3614 break;
502a2ffd 3615 }
234b27c3
ED		 3616 case MULTICAST_ADDR:
3617 /* multicast address */
3618 for (ifmca = idev->mc_list; ifmca;
3619 ifmca = ifmca->next, ip_idx++) {
3620 if (ip_idx < s_ip_idx)
3621 continue;
3622 err = inet6_fill_ifmcaddr(skb, ifmca,
3623 NETLINK_CB(cb->skb).pid,
3624 cb->nlh->nlmsg_seq,
3625 RTM_GETMULTICAST,
3626 NLM_F_MULTI);
3627 if (err <= 0)
3628 break;
3629 }
3630 break;
3631 case ANYCAST_ADDR:
3632 /* anycast address */
3633 for (ifaca = idev->ac_list; ifaca;
3634 ifaca = ifaca->aca_next, ip_idx++) {
3635 if (ip_idx < s_ip_idx)
3636 continue;
3637 err = inet6_fill_ifacaddr(skb, ifaca,
3638 NETLINK_CB(cb->skb).pid,
3639 cb->nlh->nlmsg_seq,
3640 RTM_GETANYCAST,
3641 NLM_F_MULTI);
3642 if (err <= 0)
3643 break;
3644 }
3645 break;
3646 default:
3647 break;
3648 }
3649 read_unlock_bh(&idev->lock);
3650 *p_ip_idx = ip_idx;
3651 return err;
3652}
3653
1da177e4
LT		 3654static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
3655 enum addr_type_t type)
3656{
234b27c3
ED		 3657 struct net *net = sock_net(skb->sk);
3658 int h, s_h;
1da177e4
LT		 3659 int idx, ip_idx;
3660 int s_idx, s_ip_idx;
1da177e4 3661 struct net_device *dev;
234b27c3
ED		 3662 struct inet6_dev *idev;
3663 struct hlist_head *head;
3664 struct hlist_node *node;
1ab1457c 3665
234b27c3
ED		 3666 s_h = cb->args[0];
3667 s_idx = idx = cb->args[1];
3668 s_ip_idx = ip_idx = cb->args[2];
5d5619b4 3669
234b27c3
ED		 3670 rcu_read_lock();
3671 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
3672 idx = 0;
3673 head = &net->dev_index_head[h];
3674 hlist_for_each_entry_rcu(dev, node, head, index_hlist) {
3675 if (idx < s_idx)
3676 goto cont;
4b97efdf 3677 if (h > s_h || idx > s_idx)
234b27c3
ED		 3678 s_ip_idx = 0;
3679 ip_idx = 0;
e21e8467
SH		 3680 idev = __in6_dev_get(dev);
3681 if (!idev)
234b27c3
ED		 3682 goto cont;
3683
3684 if (in6_dump_addrs(idev, skb, cb, type,
3685 s_ip_idx, &ip_idx) <= 0)
3686 goto done;
7562f876 3687cont:
234b27c3
ED		 3688 idx++;
3689 }
1da177e4 3690 }
234b27c3
ED		 3691done:
3692 rcu_read_unlock();
3693 cb->args[0] = h;
3694 cb->args[1] = idx;
3695 cb->args[2] = ip_idx;
3696
1da177e4
LT		 3697 return skb->len;
3698}
3699
3700static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
3701{
3702 enum addr_type_t type = UNICAST_ADDR;
b854272b 3703
1da177e4
LT		 3704 return inet6_dump_addr(skb, cb, type);
3705}
3706
3707static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
3708{
3709 enum addr_type_t type = MULTICAST_ADDR;
b854272b 3710
1da177e4
LT		 3711 return inet6_dump_addr(skb, cb, type);
3712}
3713
3714
3715static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
3716{
3717 enum addr_type_t type = ANYCAST_ADDR;
b854272b 3718
1da177e4
LT		 3719 return inet6_dump_addr(skb, cb, type);
3720}
3721
1b29fc2c
TG		 3722static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr* nlh,
3723 void *arg)
6c223828 3724{
3b1e0a65 3725 struct net *net = sock_net(in_skb->sk);
1b29fc2c
TG		 3726 struct ifaddrmsg *ifm;
3727 struct nlattr *tb[IFA_MAX+1];
6c223828
NT		 3728 struct in6_addr *addr = NULL;
3729 struct net_device *dev = NULL;
3730 struct inet6_ifaddr *ifa;
3731 struct sk_buff *skb;
6c223828
NT		 3732 int err;
3733
1b29fc2c
TG		 3734 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3735 if (err < 0)
3736 goto errout;
3737
3738 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3739 if (addr == NULL) {
3740 err = -EINVAL;
3741 goto errout;
6c223828 3742 }
6c223828 3743
1b29fc2c 3744 ifm = nlmsg_data(nlh);
6c223828 3745 if (ifm->ifa_index)
6fda7350 3746 dev = __dev_get_by_index(net, ifm->ifa_index);
6c223828 3747
e21e8467
SH		 3748 ifa = ipv6_get_ifaddr(net, addr, dev, 1);
3749 if (!ifa) {
1b29fc2c
TG		 3750 err = -EADDRNOTAVAIL;
3751 goto errout;
3752 }
6c223828 3753
e21e8467
SH		 3754 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
3755 if (!skb) {
6c223828 3756 err = -ENOBUFS;
1b29fc2c 3757 goto errout_ifa;
6c223828
NT		 3758 }
3759
6c223828
NT		 3760 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).pid,
3761 nlh->nlmsg_seq, RTM_NEWADDR, 0);
26932566
PM		 3762 if (err < 0) {
3763 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3764 WARN_ON(err == -EMSGSIZE);
3765 kfree_skb(skb);
3766 goto errout_ifa;
3767 }
6fda7350 3768 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).pid);
1b29fc2c 3769errout_ifa:
6c223828 3770 in6_ifa_put(ifa);
1b29fc2c 3771errout:
6c223828 3772 return err;
6c223828
NT		 3773}
3774
1da177e4
LT		 3775static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
3776{
3777 struct sk_buff *skb;
c346dca1 3778 struct net *net = dev_net(ifa->idev->dev);
5d620266 3779 int err = -ENOBUFS;
1da177e4 3780
0ab6803b 3781 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
5d620266
TG		 3782 if (skb == NULL)
3783 goto errout;
3784
3785 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
26932566
PM		 3786 if (err < 0) {
3787 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3788 WARN_ON(err == -EMSGSIZE);
3789 kfree_skb(skb);
3790 goto errout;
3791 }
1ce85fe4
PNA		 3792 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
3793 return;
5d620266
TG		 3794errout:
3795 if (err < 0)
6fda7350 3796 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
1da177e4
LT		 3797}
3798
b6f99a21 3799static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
1da177e4
LT		 3800 __s32 *array, int bytes)
3801{
04561c1f
TG		 3802 BUG_ON(bytes < (DEVCONF_MAX * 4));
3803
1da177e4
LT		 3804 memset(array, 0, bytes);
3805 array[DEVCONF_FORWARDING] = cnf->forwarding;
3806 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
3807 array[DEVCONF_MTU6] = cnf->mtu6;
3808 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
3809 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
3810 array[DEVCONF_AUTOCONF] = cnf->autoconf;
3811 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
3812 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
93908d19
TG		 3813 array[DEVCONF_RTR_SOLICIT_INTERVAL] =
3814 jiffies_to_msecs(cnf->rtr_solicit_interval);
3815 array[DEVCONF_RTR_SOLICIT_DELAY] =
3816 jiffies_to_msecs(cnf->rtr_solicit_delay);
1da177e4
LT		 3817 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
3818#ifdef CONFIG_IPV6_PRIVACY
3819 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
3820 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
3821 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
3822 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
3823 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
3824#endif
3825 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
65f5c7c1 3826 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
c4fd30eb 3827 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
930d6ff2
YH		 3828#ifdef CONFIG_IPV6_ROUTER_PREF
3829 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
93908d19
TG		 3830 array[DEVCONF_RTR_PROBE_INTERVAL] =
3831 jiffies_to_msecs(cnf->rtr_probe_interval);
fa03ef38 3832#ifdef CONFIG_IPV6_ROUTE_INFO
09c884d4
YH		 3833 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
3834#endif
930d6ff2 3835#endif
fbea49e1 3836 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
0bcbc926 3837 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
95c385b4
NH		 3838#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
3839 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
3840#endif
7bc570c8
YH		 3841#ifdef CONFIG_IPV6_MROUTE
3842 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
3843#endif
778d80be 3844 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
1b34be74 3845 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
c3faca05 3846 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
1da177e4
LT		 3847}
3848
b382b191
TG		 3849static inline size_t inet6_ifla6_size(void)
3850{
3851 return nla_total_size(4) /* IFLA_INET6_FLAGS */
3852 + nla_total_size(sizeof(struct ifla_cacheinfo))
3853 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
3854 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
3855 + nla_total_size(ICMP6_MIB_MAX * 8); /* IFLA_INET6_ICMP6STATS */
3856}
3857
339bf98f
TG		 3858static inline size_t inet6_if_nlmsg_size(void)
3859{
3860 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
3861 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
3862 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
3863 + nla_total_size(4) /* IFLA_MTU */
3864 + nla_total_size(4) /* IFLA_LINK */
b382b191 3865 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */
339bf98f 3866}
c5396a31 3867
be281e55 3868static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib,
7d720c3e 3869 int items, int bytes)
7f7d9a6b
HX		 3870{
3871 int i;
3872 int pad = bytes - sizeof(u64) * items;
3873 BUG_ON(pad < 0);
3874
3875 /* Use put_unaligned() because stats may not be aligned for u64. */
3876 put_unaligned(items, &stats[0]);
3877 for (i = 1; i < items; i++)
be281e55 3878 put_unaligned(atomic_long_read(&mib[i]), &stats[i]);
7f7d9a6b
HX		 3879
3880 memset(&stats[items], 0, pad);
3881}
3882
4ce3c183
ED		 3883static inline void __snmp6_fill_stats64(u64 *stats, void __percpu **mib,
3884 int items, int bytes, size_t syncpoff)
3885{
3886 int i;
3887 int pad = bytes - sizeof(u64) * items;
3888 BUG_ON(pad < 0);
3889
3890 /* Use put_unaligned() because stats may not be aligned for u64. */
3891 put_unaligned(items, &stats[0]);
3892 for (i = 1; i < items; i++)
3893 put_unaligned(snmp_fold_field64(mib, i, syncpoff), &stats[i]);
3894
3895 memset(&stats[items], 0, pad);
3896}
3897
7f7d9a6b
HX		 3898static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
3899 int bytes)
3900{
e21e8467 3901 switch (attrtype) {
7f7d9a6b 3902 case IFLA_INET6_STATS:
4ce3c183
ED		 3903 __snmp6_fill_stats64(stats, (void __percpu **)idev->stats.ipv6,
3904 IPSTATS_MIB_MAX, bytes, offsetof(struct ipstats_mib, syncp));
7f7d9a6b
HX		 3905 break;
3906 case IFLA_INET6_ICMP6STATS:
be281e55 3907 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, ICMP6_MIB_MAX, bytes);
7f7d9a6b
HX		 3908 break;
3909 }
3910}
3911
b382b191
TG		 3912static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev)
3913{
3914 struct nlattr *nla;
3915 struct ifla_cacheinfo ci;
3916
3917 NLA_PUT_U32(skb, IFLA_INET6_FLAGS, idev->if_flags);
3918
3919 ci.max_reasm_len = IPV6_MAXPLEN;
24912420
DM		 3920 ci.tstamp = cstamp_delta(idev->tstamp);
3921 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time);
3922 ci.retrans_time = jiffies_to_msecs(idev->nd_parms->retrans_time);
b382b191
TG		 3923 NLA_PUT(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci);
3924
3925 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
3926 if (nla == NULL)
3927 goto nla_put_failure;
3928 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
3929
3930 /* XXX - MC not implemented */
3931
3932 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
3933 if (nla == NULL)
3934 goto nla_put_failure;
3935 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
3936
3937 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
3938 if (nla == NULL)
3939 goto nla_put_failure;
3940 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
3941
3942 return 0;
3943
3944nla_put_failure:
3945 return -EMSGSIZE;
3946}
3947
3948static size_t inet6_get_link_af_size(const struct net_device *dev)
3949{
3950 if (!__in6_dev_get(dev))
3951 return 0;
3952
3953 return inet6_ifla6_size();
3954}
3955
3956static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev)
3957{
3958 struct inet6_dev *idev = __in6_dev_get(dev);
3959
3960 if (!idev)
3961 return -ENODATA;
3962
3963 if (inet6_fill_ifla6_attrs(skb, idev) < 0)
3964 return -EMSGSIZE;
3965
3966 return 0;
3967}
3968
1ab1457c 3969static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
b6544c0b 3970 u32 pid, u32 seq, int event, unsigned int flags)
1da177e4 3971{
04561c1f 3972 struct net_device *dev = idev->dev;
04561c1f
TG		 3973 struct ifinfomsg *hdr;
3974 struct nlmsghdr *nlh;
3975 void *protoinfo;
04561c1f
TG		 3976
3977 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*hdr), flags);
3978 if (nlh == NULL)
26932566 3979 return -EMSGSIZE;
04561c1f
TG		 3980
3981 hdr = nlmsg_data(nlh);
3982 hdr->ifi_family = AF_INET6;
3983 hdr->__ifi_pad = 0;
3984 hdr->ifi_type = dev->type;
3985 hdr->ifi_index = dev->ifindex;
3986 hdr->ifi_flags = dev_get_flags(dev);
3987 hdr->ifi_change = 0;
3988
3989 NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name);
1da177e4
LT		 3990
3991 if (dev->addr_len)
04561c1f 3992 NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
1da177e4 3993
04561c1f 3994 NLA_PUT_U32(skb, IFLA_MTU, dev->mtu);
1da177e4 3995 if (dev->ifindex != dev->iflink)
04561c1f 3996 NLA_PUT_U32(skb, IFLA_LINK, dev->iflink);
1da177e4 3997
04561c1f
TG		 3998 protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
3999 if (protoinfo == NULL)
4000 goto nla_put_failure;
1da177e4 4001
b382b191 4002 if (inet6_fill_ifla6_attrs(skb, idev) < 0)
bf99f1bd 4003 goto nla_put_failure;
1da177e4 4004
04561c1f
TG		 4005 nla_nest_end(skb, protoinfo);
4006 return nlmsg_end(skb, nlh);
1da177e4 4007
04561c1f 4008nla_put_failure:
26932566
PM		 4009 nlmsg_cancel(skb, nlh);
4010 return -EMSGSIZE;
1da177e4
LT		 4011}
4012
4013static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
4014{
3b1e0a65 4015 struct net *net = sock_net(skb->sk);
84d2697d 4016 int h, s_h;
434a8a58 4017 int idx = 0, s_idx;
1da177e4
LT		 4018 struct net_device *dev;
4019 struct inet6_dev *idev;
84d2697d
ED		 4020 struct hlist_head *head;
4021 struct hlist_node *node;
1da177e4 4022
84d2697d
ED		 4023 s_h = cb->args[0];
4024 s_idx = cb->args[1];
4025
4026 rcu_read_lock();
4027 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4028 idx = 0;
4029 head = &net->dev_index_head[h];
4030 hlist_for_each_entry_rcu(dev, node, head, index_hlist) {
4031 if (idx < s_idx)
4032 goto cont;
4033 idev = __in6_dev_get(dev);
4034 if (!idev)
4035 goto cont;
4036 if (inet6_fill_ifinfo(skb, idev,
4037 NETLINK_CB(cb->skb).pid,
4038 cb->nlh->nlmsg_seq,
4039 RTM_NEWLINK, NLM_F_MULTI) <= 0)
4040 goto out;
7562f876 4041cont:
84d2697d
ED		 4042 idx++;
4043 }
1da177e4 4044 }
84d2697d
ED		 4045out:
4046 rcu_read_unlock();
4047 cb->args[1] = idx;
4048 cb->args[0] = h;
1da177e4
LT		 4049
4050 return skb->len;
4051}
4052
4053void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
4054{
4055 struct sk_buff *skb;
c346dca1 4056 struct net *net = dev_net(idev->dev);
8d7a76c9 4057 int err = -ENOBUFS;
1ab1457c 4058
339bf98f 4059 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
8d7a76c9
TG		 4060 if (skb == NULL)
4061 goto errout;
4062
4063 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
26932566
PM		 4064 if (err < 0) {
4065 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
4066 WARN_ON(err == -EMSGSIZE);
4067 kfree_skb(skb);
4068 goto errout;
4069 }
5f75a104 4070 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC);
1ce85fe4 4071 return;
8d7a76c9
TG		 4072errout:
4073 if (err < 0)
5f75a104 4074 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err);
1da177e4
LT		 4075}
4076
339bf98f
TG		 4077static inline size_t inet6_prefix_nlmsg_size(void)
4078{
4079 return NLMSG_ALIGN(sizeof(struct prefixmsg))
4080 + nla_total_size(sizeof(struct in6_addr))
4081 + nla_total_size(sizeof(struct prefix_cacheinfo));
4082}
c5396a31 4083
1da177e4 4084static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
6051e2f4
TG		 4085 struct prefix_info *pinfo, u32 pid, u32 seq,
4086 int event, unsigned int flags)
1da177e4 4087{
6051e2f4
TG		 4088 struct prefixmsg *pmsg;
4089 struct nlmsghdr *nlh;
1da177e4
LT		 4090 struct prefix_cacheinfo ci;
4091
6051e2f4
TG		 4092 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*pmsg), flags);
4093 if (nlh == NULL)
26932566 4094 return -EMSGSIZE;
6051e2f4
TG		 4095
4096 pmsg = nlmsg_data(nlh);
1da177e4 4097 pmsg->prefix_family = AF_INET6;
8a47077a
PM		 4098 pmsg->prefix_pad1 = 0;
4099 pmsg->prefix_pad2 = 0;
1da177e4
LT		 4100 pmsg->prefix_ifindex = idev->dev->ifindex;
4101 pmsg->prefix_len = pinfo->prefix_len;
4102 pmsg->prefix_type = pinfo->type;
8a47077a 4103 pmsg->prefix_pad3 = 0;
1da177e4
LT		 4104 pmsg->prefix_flags = 0;
4105 if (pinfo->onlink)
4106 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
4107 if (pinfo->autoconf)
4108 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
4109
6051e2f4 4110 NLA_PUT(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix);
1da177e4
LT		 4111
4112 ci.preferred_time = ntohl(pinfo->prefered);
4113 ci.valid_time = ntohl(pinfo->valid);
6051e2f4 4114 NLA_PUT(skb, PREFIX_CACHEINFO, sizeof(ci), &ci);
1da177e4 4115
6051e2f4 4116 return nlmsg_end(skb, nlh);
1da177e4 4117
6051e2f4 4118nla_put_failure:
26932566
PM		 4119 nlmsg_cancel(skb, nlh);
4120 return -EMSGSIZE;
1da177e4
LT		 4121}
4122
1ab1457c 4123static void inet6_prefix_notify(int event, struct inet6_dev *idev,
1da177e4
LT		 4124 struct prefix_info *pinfo)
4125{
4126 struct sk_buff *skb;
c346dca1 4127 struct net *net = dev_net(idev->dev);
8c384bfa 4128 int err = -ENOBUFS;
1da177e4 4129
339bf98f 4130 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
8c384bfa
TG		 4131 if (skb == NULL)
4132 goto errout;
4133
4134 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
26932566
PM		 4135 if (err < 0) {
4136 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
4137 WARN_ON(err == -EMSGSIZE);
4138 kfree_skb(skb);
4139 goto errout;
4140 }
1ce85fe4
PNA		 4141 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
4142 return;
8c384bfa
TG		 4143errout:
4144 if (err < 0)
6fda7350 4145 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
1da177e4
LT		 4146}
4147
1da177e4
LT		 4148static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4149{
4150 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
4151
4152 switch (event) {
4153 case RTM_NEWADDR:
95c385b4
NH		 4154 /*
4155 * If the address was optimistic
4156 * we inserted the route at the start of
4157 * our DAD process, so we don't need
4158 * to do it again
4159 */
4160 if (!(ifp->rt->rt6i_node))
4161 ip6_ins_rt(ifp->rt);
1da177e4
LT		 4162 if (ifp->idev->cnf.forwarding)
4163 addrconf_join_anycast(ifp);
4164 break;
4165 case RTM_DELADDR:
4166 if (ifp->idev->cnf.forwarding)
4167 addrconf_leave_anycast(ifp);
4168 addrconf_leave_solict(ifp->idev, &ifp->addr);
d8d1f30b 4169 dst_hold(&ifp->rt->dst);
93fa159a 4170
73a8bd74 4171 if (ip6_del_rt(ifp->rt))
d8d1f30b 4172 dst_free(&ifp->rt->dst);
1da177e4
LT		 4173 break;
4174 }
4175}
4176
4177static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4178{
8814c4b5 4179 rcu_read_lock_bh();
1da177e4
LT		 4180 if (likely(ifp->idev->dead == 0))
4181 __ipv6_ifa_notify(event, ifp);
8814c4b5 4182 rcu_read_unlock_bh();
1da177e4
LT		 4183}
4184
4185#ifdef CONFIG_SYSCTL
4186
4187static
8d65af78 4188int addrconf_sysctl_forward(ctl_table *ctl, int write,
1da177e4
LT		 4189 void __user *buffer, size_t *lenp, loff_t *ppos)
4190{
4191 int *valp = ctl->data;
4192 int val = *valp;
88af182e 4193 loff_t pos = *ppos;
1da177e4
LT		 4194 int ret;
4195
8d65af78 4196 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
1da177e4 4197
c8fecf22 4198 if (write)
b325fddb 4199 ret = addrconf_fixup_forwarding(ctl, valp, val);
88af182e
EB		 4200 if (ret)
4201 *ppos = pos;
1ab1457c 4202 return ret;
1da177e4
LT		 4203}
4204
56d417b1
BH		 4205static void dev_disable_change(struct inet6_dev *idev)
4206{
4207 if (!idev || !idev->dev)
4208 return;
4209
4210 if (idev->cnf.disable_ipv6)
4211 addrconf_notify(NULL, NETDEV_DOWN, idev->dev);
4212 else
4213 addrconf_notify(NULL, NETDEV_UP, idev->dev);
4214}
4215
4216static void addrconf_disable_change(struct net *net, __s32 newf)
4217{
4218 struct net_device *dev;
4219 struct inet6_dev *idev;
4220
c6d14c84
ED		 4221 rcu_read_lock();
4222 for_each_netdev_rcu(net, dev) {
56d417b1
BH		 4223 idev = __in6_dev_get(dev);
4224 if (idev) {
4225 int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
4226 idev->cnf.disable_ipv6 = newf;
4227 if (changed)
4228 dev_disable_change(idev);
4229 }
56d417b1 4230 }
c6d14c84 4231 rcu_read_unlock();
56d417b1
BH		 4232}
4233
4234static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int old)
4235{
4236 struct net *net;
4237
4238 net = (struct net *)table->extra2;
4239
4240 if (p == &net->ipv6.devconf_dflt->disable_ipv6)
4241 return 0;
4242
88af182e
EB		 4243 if (!rtnl_trylock()) {
4244 /* Restore the original values before restarting */
4245 *p = old;
56d417b1 4246 return restart_syscall();
88af182e 4247 }
56d417b1
BH		 4248
4249 if (p == &net->ipv6.devconf_all->disable_ipv6) {
4250 __s32 newf = net->ipv6.devconf_all->disable_ipv6;
4251 net->ipv6.devconf_dflt->disable_ipv6 = newf;
4252 addrconf_disable_change(net, newf);
4253 } else if ((!*p) ^ (!old))
4254 dev_disable_change((struct inet6_dev *)table->extra1);
4255
4256 rtnl_unlock();
4257 return 0;
4258}
4259
4260static
8d65af78 4261int addrconf_sysctl_disable(ctl_table *ctl, int write,
56d417b1
BH		 4262 void __user *buffer, size_t *lenp, loff_t *ppos)
4263{
4264 int *valp = ctl->data;
4265 int val = *valp;
88af182e 4266 loff_t pos = *ppos;
56d417b1
BH		 4267 int ret;
4268
8d65af78 4269 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
56d417b1
BH		 4270
4271 if (write)
4272 ret = addrconf_disable_ipv6(ctl, valp, val);
88af182e
EB		 4273 if (ret)
4274 *ppos = pos;
56d417b1
BH		 4275 return ret;
4276}
4277
1da177e4
LT		 4278static struct addrconf_sysctl_table
4279{
4280 struct ctl_table_header *sysctl_header;
f6a07b29 4281 ctl_table addrconf_vars[DEVCONF_MAX+1];
1dab6222 4282 char *dev_name;
ab32ea5d 4283} addrconf_sysctl __read_mostly = {
1da177e4
LT		 4284 .sysctl_header = NULL,
4285 .addrconf_vars = {
1ab1457c 4286 {
e21e8467
SH		 4287 .procname = "forwarding",
4288 .data = &ipv6_devconf.forwarding,
4289 .maxlen = sizeof(int),
4290 .mode = 0644,
4291 .proc_handler = addrconf_sysctl_forward,
1da177e4
LT		 4292 },
4293 {
e21e8467
SH		 4294 .procname = "hop_limit",
4295 .data = &ipv6_devconf.hop_limit,
4296 .maxlen = sizeof(int),
4297 .mode = 0644,
4298 .proc_handler = proc_dointvec,
1da177e4
LT		 4299 },
4300 {
e21e8467
SH		 4301 .procname = "mtu",
4302 .data = &ipv6_devconf.mtu6,
4303 .maxlen = sizeof(int),
4304 .mode = 0644,
4305 .proc_handler = proc_dointvec,
1da177e4
LT		 4306 },
4307 {
e21e8467
SH		 4308 .procname = "accept_ra",
4309 .data = &ipv6_devconf.accept_ra,
4310 .maxlen = sizeof(int),
4311 .mode = 0644,
4312 .proc_handler = proc_dointvec,
1da177e4
LT		 4313 },
4314 {
e21e8467
SH		 4315 .procname = "accept_redirects",
4316 .data = &ipv6_devconf.accept_redirects,
4317 .maxlen = sizeof(int),
4318 .mode = 0644,
4319 .proc_handler = proc_dointvec,
1da177e4
LT		 4320 },
4321 {
e21e8467
SH		 4322 .procname = "autoconf",
4323 .data = &ipv6_devconf.autoconf,
4324 .maxlen = sizeof(int),
4325 .mode = 0644,
4326 .proc_handler = proc_dointvec,
1da177e4
LT		 4327 },
4328 {
e21e8467
SH		 4329 .procname = "dad_transmits",
4330 .data = &ipv6_devconf.dad_transmits,
4331 .maxlen = sizeof(int),
4332 .mode = 0644,
4333 .proc_handler = proc_dointvec,
1da177e4
LT		 4334 },
4335 {
e21e8467
SH		 4336 .procname = "router_solicitations",
4337 .data = &ipv6_devconf.rtr_solicits,
4338 .maxlen = sizeof(int),
4339 .mode = 0644,
4340 .proc_handler = proc_dointvec,
1da177e4
LT		 4341 },
4342 {
e21e8467
SH		 4343 .procname = "router_solicitation_interval",
4344 .data = &ipv6_devconf.rtr_solicit_interval,
4345 .maxlen = sizeof(int),
4346 .mode = 0644,
4347 .proc_handler = proc_dointvec_jiffies,
1da177e4
LT		 4348 },
4349 {
e21e8467
SH		 4350 .procname = "router_solicitation_delay",
4351 .data = &ipv6_devconf.rtr_solicit_delay,
4352 .maxlen = sizeof(int),
4353 .mode = 0644,
4354 .proc_handler = proc_dointvec_jiffies,
1da177e4
LT		 4355 },
4356 {
e21e8467
SH		 4357 .procname = "force_mld_version",
4358 .data = &ipv6_devconf.force_mld_version,
4359 .maxlen = sizeof(int),
4360 .mode = 0644,
4361 .proc_handler = proc_dointvec,
1da177e4
LT		 4362 },
4363#ifdef CONFIG_IPV6_PRIVACY
4364 {
e21e8467
SH		 4365 .procname = "use_tempaddr",
4366 .data = &ipv6_devconf.use_tempaddr,
4367 .maxlen = sizeof(int),
4368 .mode = 0644,
4369 .proc_handler = proc_dointvec,
1da177e4
LT		 4370 },
4371 {
e21e8467
SH		 4372 .procname = "temp_valid_lft",
4373 .data = &ipv6_devconf.temp_valid_lft,
4374 .maxlen = sizeof(int),
4375 .mode = 0644,
4376 .proc_handler = proc_dointvec,
1da177e4
LT		 4377 },
4378 {
e21e8467
SH		 4379 .procname = "temp_prefered_lft",
4380 .data = &ipv6_devconf.temp_prefered_lft,
4381 .maxlen = sizeof(int),
4382 .mode = 0644,
4383 .proc_handler = proc_dointvec,
1da177e4
LT		 4384 },
4385 {
e21e8467
SH		 4386 .procname = "regen_max_retry",
4387 .data = &ipv6_devconf.regen_max_retry,
4388 .maxlen = sizeof(int),
4389 .mode = 0644,
4390 .proc_handler = proc_dointvec,
1da177e4
LT		 4391 },
4392 {
e21e8467
SH		 4393 .procname = "max_desync_factor",
4394 .data = &ipv6_devconf.max_desync_factor,
4395 .maxlen = sizeof(int),
4396 .mode = 0644,
4397 .proc_handler = proc_dointvec,
1da177e4
LT		 4398 },
4399#endif
4400 {
e21e8467
SH		 4401 .procname = "max_addresses",
4402 .data = &ipv6_devconf.max_addresses,
4403 .maxlen = sizeof(int),
4404 .mode = 0644,
4405 .proc_handler = proc_dointvec,
1da177e4 4406 },
65f5c7c1 4407 {
e21e8467
SH		 4408 .procname = "accept_ra_defrtr",
4409 .data = &ipv6_devconf.accept_ra_defrtr,
4410 .maxlen = sizeof(int),
4411 .mode = 0644,
4412 .proc_handler = proc_dointvec,
65f5c7c1 4413 },
c4fd30eb 4414 {
e21e8467
SH		 4415 .procname = "accept_ra_pinfo",
4416 .data = &ipv6_devconf.accept_ra_pinfo,
4417 .maxlen = sizeof(int),
4418 .mode = 0644,
4419 .proc_handler = proc_dointvec,
c4fd30eb 4420 },
930d6ff2
YH		 4421#ifdef CONFIG_IPV6_ROUTER_PREF
4422 {
e21e8467
SH		 4423 .procname = "accept_ra_rtr_pref",
4424 .data = &ipv6_devconf.accept_ra_rtr_pref,
4425 .maxlen = sizeof(int),
4426 .mode = 0644,
4427 .proc_handler = proc_dointvec,
930d6ff2 4428 },
52e16356 4429 {
e21e8467
SH		 4430 .procname = "router_probe_interval",
4431 .data = &ipv6_devconf.rtr_probe_interval,
4432 .maxlen = sizeof(int),
4433 .mode = 0644,
4434 .proc_handler = proc_dointvec_jiffies,
52e16356 4435 },
fa03ef38 4436#ifdef CONFIG_IPV6_ROUTE_INFO
09c884d4 4437 {
e21e8467
SH		 4438 .procname = "accept_ra_rt_info_max_plen",
4439 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
4440 .maxlen = sizeof(int),
4441 .mode = 0644,
4442 .proc_handler = proc_dointvec,
09c884d4
YH		 4443 },
4444#endif
930d6ff2 4445#endif
fbea49e1 4446 {
e21e8467
SH		 4447 .procname = "proxy_ndp",
4448 .data = &ipv6_devconf.proxy_ndp,
4449 .maxlen = sizeof(int),
4450 .mode = 0644,
4451 .proc_handler = proc_dointvec,
fbea49e1 4452 },
0bcbc926 4453 {
e21e8467
SH		 4454 .procname = "accept_source_route",
4455 .data = &ipv6_devconf.accept_source_route,
4456 .maxlen = sizeof(int),
4457 .mode = 0644,
4458 .proc_handler = proc_dointvec,
0bcbc926 4459 },
95c385b4
NH		 4460#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4461 {
e21e8467
SH		 4462 .procname = "optimistic_dad",
4463 .data = &ipv6_devconf.optimistic_dad,
4464 .maxlen = sizeof(int),
4465 .mode = 0644,
4466 .proc_handler = proc_dointvec,
95c385b4
NH		 4467
4468 },
7bc570c8
YH		 4469#endif
4470#ifdef CONFIG_IPV6_MROUTE
4471 {
e21e8467
SH		 4472 .procname = "mc_forwarding",
4473 .data = &ipv6_devconf.mc_forwarding,
4474 .maxlen = sizeof(int),
4475 .mode = 0444,
4476 .proc_handler = proc_dointvec,
7bc570c8 4477 },
95c385b4 4478#endif
778d80be 4479 {
e21e8467
SH		 4480 .procname = "disable_ipv6",
4481 .data = &ipv6_devconf.disable_ipv6,
4482 .maxlen = sizeof(int),
4483 .mode = 0644,
4484 .proc_handler = addrconf_sysctl_disable,
778d80be 4485 },
1b34be74 4486 {
e21e8467
SH		 4487 .procname = "accept_dad",
4488 .data = &ipv6_devconf.accept_dad,
4489 .maxlen = sizeof(int),
4490 .mode = 0644,
4491 .proc_handler = proc_dointvec,
1b34be74 4492 },
f7734fdf 4493 {
f7734fdf
OP		 4494 .procname = "force_tllao",
4495 .data = &ipv6_devconf.force_tllao,
4496 .maxlen = sizeof(int),
4497 .mode = 0644,
4498 .proc_handler = proc_dointvec
4499 },
1da177e4 4500 {
f8572d8f 4501 /* sentinel */
1da177e4
LT		 4502 }
4503 },
1da177e4
LT		 4504};
4505
bff16c2f 4506static int __addrconf_sysctl_register(struct net *net, char *dev_name,
f8572d8f 4507 struct inet6_dev *idev, struct ipv6_devconf *p)
1da177e4
LT		 4508{
4509 int i;
1da177e4 4510 struct addrconf_sysctl_table *t;
1da177e4 4511
1dab6222
PE		 4512#define ADDRCONF_CTL_PATH_DEV 3
4513
4514 struct ctl_path addrconf_ctl_path[] = {
f8572d8f
EB		 4515 { .procname = "net", },
4516 { .procname = "ipv6", },
4517 { .procname = "conf", },
1dab6222
PE		 4518 { /* to be set */ },
4519 { },
4520 };
4521
4522
af879cc7 4523 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
1da177e4 4524 if (t == NULL)
f68635e6
PE		 4525 goto out;
4526
bcdd553f 4527 for (i = 0; t->addrconf_vars[i].data; i++) {
e21e8467 4528 t->addrconf_vars[i].data += (char *)p - (char *)&ipv6_devconf;
1da177e4 4529 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
bff16c2f 4530 t->addrconf_vars[i].extra2 = net;
1da177e4 4531 }
1da177e4 4532
1ab1457c
YH		 4533 /*
4534 * Make a copy of dev_name, because '.procname' is regarded as const
1da177e4
LT		 4535 * by sysctl and we wouldn't want anyone to change it under our feet
4536 * (see SIOCSIFNAME).
1ab1457c 4537 */
1dab6222
PE		 4538 t->dev_name = kstrdup(dev_name, GFP_KERNEL);
4539 if (!t->dev_name)
f68635e6 4540 goto free;
1da177e4 4541
1dab6222 4542 addrconf_ctl_path[ADDRCONF_CTL_PATH_DEV].procname = t->dev_name;
1da177e4 4543
bff16c2f 4544 t->sysctl_header = register_net_sysctl_table(net, addrconf_ctl_path,
1dab6222 4545 t->addrconf_vars);
1da177e4
LT		 4546 if (t->sysctl_header == NULL)
4547 goto free_procname;
f68635e6
PE		 4548
4549 p->sysctl = t;
95897312 4550 return 0;
1da177e4 4551
f68635e6 4552free_procname:
1dab6222 4553 kfree(t->dev_name);
f68635e6 4554free:
1da177e4 4555 kfree(t);
f68635e6 4556out:
95897312 4557 return -ENOBUFS;
1da177e4
LT		 4558}
4559
408c4768
PE		 4560static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
4561{
4562 struct addrconf_sysctl_table *t;
4563
4564 if (p->sysctl == NULL)
4565 return;
4566
4567 t = p->sysctl;
4568 p->sysctl = NULL;
ff538818 4569 unregister_net_sysctl_table(t->sysctl_header);
408c4768
PE		 4570 kfree(t->dev_name);
4571 kfree(t);
4572}
4573
f52295a9
PE		 4574static void addrconf_sysctl_register(struct inet6_dev *idev)
4575{
54716e3b 4576 neigh_sysctl_register(idev->dev, idev->nd_parms, "ipv6",
f8572d8f 4577 &ndisc_ifinfo_sysctl_change);
c346dca1 4578 __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
f8572d8f 4579 idev, &idev->cnf);
f52295a9
PE		 4580}
4581
408c4768 4582static void addrconf_sysctl_unregister(struct inet6_dev *idev)
1da177e4 4583{
408c4768
PE		 4584 __addrconf_sysctl_unregister(&idev->cnf);
4585 neigh_sysctl_unregister(idev->nd_parms);
1da177e4
LT		 4586}
4587
4588
4589#endif
4590
2c8c1e72 4591static int __net_init addrconf_init_net(struct net *net)
e0da5a48
PE		 4592{
4593 int err;
4594 struct ipv6_devconf *all, *dflt;
4595
4596 err = -ENOMEM;
4597 all = &ipv6_devconf;
4598 dflt = &ipv6_devconf_dflt;
4599
09ad9bc7 4600 if (!net_eq(net, &init_net)) {
e0da5a48
PE		 4601 all = kmemdup(all, sizeof(ipv6_devconf), GFP_KERNEL);
4602 if (all == NULL)
4603 goto err_alloc_all;
4604
4605 dflt = kmemdup(dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
4606 if (dflt == NULL)
4607 goto err_alloc_dflt;
56d417b1
BH		 4608 } else {
4609 /* these will be inherited by all namespaces */
4610 dflt->autoconf = ipv6_defaults.autoconf;
4611 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
e0da5a48
PE		 4612 }
4613
4614 net->ipv6.devconf_all = all;
4615 net->ipv6.devconf_dflt = dflt;
4616
4617#ifdef CONFIG_SYSCTL
f8572d8f 4618 err = __addrconf_sysctl_register(net, "all", NULL, all);
e0da5a48
PE		 4619 if (err < 0)
4620 goto err_reg_all;
4621
f8572d8f 4622 err = __addrconf_sysctl_register(net, "default", NULL, dflt);
e0da5a48
PE		 4623 if (err < 0)
4624 goto err_reg_dflt;
4625#endif
4626 return 0;
4627
4628#ifdef CONFIG_SYSCTL
4629err_reg_dflt:
4630 __addrconf_sysctl_unregister(all);
4631err_reg_all:
4632 kfree(dflt);
4633#endif
4634err_alloc_dflt:
4635 kfree(all);
4636err_alloc_all:
4637 return err;
4638}
4639
2c8c1e72 4640static void __net_exit addrconf_exit_net(struct net *net)
e0da5a48
PE		 4641{
4642#ifdef CONFIG_SYSCTL
4643 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
4644 __addrconf_sysctl_unregister(net->ipv6.devconf_all);
4645#endif
09ad9bc7 4646 if (!net_eq(net, &init_net)) {
e0da5a48
PE		 4647 kfree(net->ipv6.devconf_dflt);
4648 kfree(net->ipv6.devconf_all);
4649 }
4650}
4651
4652static struct pernet_operations addrconf_ops = {
4653 .init = addrconf_init_net,
4654 .exit = addrconf_exit_net,
4655};
4656
1da177e4
LT		 4657/*
4658 * Device notifier
4659 */
4660
4661int register_inet6addr_notifier(struct notifier_block *nb)
4662{
1ab1457c 4663 return atomic_notifier_chain_register(&inet6addr_chain, nb);
1da177e4 4664}
7159039a
YH		 4665EXPORT_SYMBOL(register_inet6addr_notifier);
4666
1da177e4
LT		 4667int unregister_inet6addr_notifier(struct notifier_block *nb)
4668{
e21e8467 4669 return atomic_notifier_chain_unregister(&inet6addr_chain, nb);
1da177e4 4670}
7159039a
YH		 4671EXPORT_SYMBOL(unregister_inet6addr_notifier);
4672
b382b191
TG		 4673static struct rtnl_af_ops inet6_ops = {
4674 .family = AF_INET6,
4675 .fill_link_af = inet6_fill_link_af,
4676 .get_link_af_size = inet6_get_link_af_size,
b382b191
TG		 4677};
4678
1da177e4
LT		 4679/*
4680 * Init / cleanup code
4681 */
4682
4683int __init addrconf_init(void)
4684{
c2e21293 4685 int i, err;
2a8cc6c8 4686
e21e8467
SH		 4687 err = ipv6_addr_label_init();
4688 if (err < 0) {
4689 printk(KERN_CRIT "IPv6 Addrconf:"
4690 " cannot initialize default policy table: %d.\n", err);
2cc6d2bf 4691 goto out;
2a8cc6c8 4692 }
1da177e4 4693
2cc6d2bf
NH		 4694 err = register_pernet_subsys(&addrconf_ops);
4695 if (err < 0)
4696 goto out_addrlabel;
e0da5a48 4697
1da177e4
LT		 4698 /* The addrconf netdev notifier requires that loopback_dev
4699 * has it's ipv6 private information allocated and setup
4700 * before it can bring up and give link-local addresses
4701 * to other devices which are up.
4702 *
4703 * Unfortunately, loopback_dev is not necessarily the first
4704 * entry in the global dev_base list of net devices. In fact,
4705 * it is likely to be the very last entry on that list.
4706 * So this causes the notifier registry below to try and
4707 * give link-local addresses to all devices besides loopback_dev
4708 * first, then loopback_dev, which cases all the non-loopback_dev
4709 * devices to fail to get a link-local address.
4710 *
4711 * So, as a temporary fix, allocate the ipv6 structure for
4712 * loopback_dev first by hand.
4713 * Longer term, all of the dependencies ipv6 has upon the loopback
4714 * device and it being up should be removed.
4715 */
4716 rtnl_lock();
2774c7ab 4717 if (!ipv6_add_dev(init_net.loopback_dev))
1da177e4
LT		 4718 err = -ENOMEM;
4719 rtnl_unlock();
4720 if (err)
e0da5a48 4721 goto errlo;
1da177e4 4722
c2e21293 4723 for (i = 0; i < IN6_ADDR_HSIZE; i++)
4724 INIT_HLIST_HEAD(&inet6_addr_lst[i]);
4725
1da177e4
LT		 4726 register_netdevice_notifier(&ipv6_dev_notf);
4727
1da177e4 4728 addrconf_verify(0);
c127ea2c 4729
b382b191
TG		 4730 err = rtnl_af_register(&inet6_ops);
4731 if (err < 0)
4732 goto errout_af;
4733
c7ac8679
GR		 4734 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo,
4735 NULL);
c127ea2c
TG		 4736 if (err < 0)
4737 goto errout;
4738
4739 /* Only the first call to __rtnl_register can fail */
c7ac8679
GR		 4740 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL, NULL);
4741 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL, NULL);
4742 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr,
4743 inet6_dump_ifaddr, NULL);
4744 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL,
4745 inet6_dump_ifmcaddr, NULL);
4746 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL,
4747 inet6_dump_ifacaddr, NULL);
c127ea2c 4748
2a8cc6c8
YH		 4749 ipv6_addr_label_rtnl_register();
4750
1da177e4 4751 return 0;
c127ea2c 4752errout:
b382b191
TG		 4753 rtnl_af_unregister(&inet6_ops);
4754errout_af:
c127ea2c 4755 unregister_netdevice_notifier(&ipv6_dev_notf);
e0da5a48
PE		 4756errlo:
4757 unregister_pernet_subsys(&addrconf_ops);
2cc6d2bf
NH		 4758out_addrlabel:
4759 ipv6_addr_label_cleanup();
4760out:
c127ea2c 4761 return err;
1da177e4
LT		 4762}
4763
09f7709f 4764void addrconf_cleanup(void)
1da177e4 4765{
176c39af 4766 struct net_device *dev;
1da177e4
LT		 4767 int i;
4768
4769 unregister_netdevice_notifier(&ipv6_dev_notf);
e0da5a48 4770 unregister_pernet_subsys(&addrconf_ops);
2cc6d2bf 4771 ipv6_addr_label_cleanup();
1da177e4
LT		 4772
4773 rtnl_lock();
4774
b382b191
TG		 4775 __rtnl_af_unregister(&inet6_ops);
4776
176c39af
DL		 4777 /* clean dev list */
4778 for_each_netdev(&init_net, dev) {
4779 if (__in6_dev_get(dev) == NULL)
4780 continue;
4781 addrconf_ifdown(dev, 1);
4782 }
4783 addrconf_ifdown(init_net.loopback_dev, 2);
4784
1da177e4
LT		 4785 /*
4786 * Check hash table.
4787 */
5c578aed 4788 spin_lock_bh(&addrconf_hash_lock);
c2e21293 4789 for (i = 0; i < IN6_ADDR_HSIZE; i++)
4790 WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
5c578aed 4791 spin_unlock_bh(&addrconf_hash_lock);
1da177e4
LT		 4792
4793 del_timer(&addr_chk_timer);
1da177e4 4794 rtnl_unlock();
1da177e4 4795}
kernel source for telekom puls (alcatel/mediatek)