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ipv6: don't accept multicast traffic with scope 0
[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
f3213831
JP		 41#define pr_fmt(fmt) "IPv6: " fmt
42
1da177e4
LT		 43#include <linux/errno.h>
44#include <linux/types.h>
a0bffffc 45#include <linux/kernel.h>
1da177e4
LT		 46#include <linux/socket.h>
47#include <linux/sockios.h>
1da177e4
LT		 48#include <linux/net.h>
49#include <linux/in6.h>
50#include <linux/netdevice.h>
1823730f 51#include <linux/if_addr.h>
1da177e4
LT		 52#include <linux/if_arp.h>
53#include <linux/if_arcnet.h>
54#include <linux/if_infiniband.h>
55#include <linux/route.h>
56#include <linux/inetdevice.h>
57#include <linux/init.h>
5a0e3ad6 58#include <linux/slab.h>
1da177e4
LT		 59#ifdef CONFIG_SYSCTL
60#include <linux/sysctl.h>
61#endif
4fc268d2 62#include <linux/capability.h>
1da177e4
LT		 63#include <linux/delay.h>
64#include <linux/notifier.h>
543537bd 65#include <linux/string.h>
ddbe5032 66#include <linux/hash.h>
1da177e4 67
457c4cbc 68#include <net/net_namespace.h>
1da177e4
LT		 69#include <net/sock.h>
70#include <net/snmp.h>
71
06a4c1c5 72#include <net/af_ieee802154.h>
1da177e4
LT		 73#include <net/ipv6.h>
74#include <net/protocol.h>
75#include <net/ndisc.h>
76#include <net/ip6_route.h>
77#include <net/addrconf.h>
78#include <net/tcp.h>
79#include <net/ip.h>
5d620266 80#include <net/netlink.h>
f24e3d65 81#include <net/pkt_sched.h>
1da177e4
LT		 82#include <linux/if_tunnel.h>
83#include <linux/rtnetlink.h>
f3a1bfb1 84#include <linux/netconf.h>
1da177e4
LT		 85
86#ifdef CONFIG_IPV6_PRIVACY
87#include <linux/random.h>
1da177e4
LT		 88#endif
89
e21e8467 90#include <linux/uaccess.h>
7f7d9a6b 91#include <asm/unaligned.h>
1da177e4
LT		 92
93#include <linux/proc_fs.h>
94#include <linux/seq_file.h>
bc3b2d7f 95#include <linux/export.h>
1da177e4
LT		 96
97/* Set to 3 to get tracing... */
98#define ACONF_DEBUG 2
99
100#if ACONF_DEBUG >= 3
101#define ADBG(x) printk x
102#else
103#define ADBG(x)
104#endif
105
106#define INFINITY_LIFE_TIME 0xFFFFFFFF
18a31e1e
TG		 107
108static inline u32 cstamp_delta(unsigned long cstamp)
109{
110 return (cstamp - INITIAL_JIFFIES) * 100UL / HZ;
111}
1da177e4
LT		 112
113#ifdef CONFIG_SYSCTL
f52295a9 114static void addrconf_sysctl_register(struct inet6_dev *idev);
408c4768
PE		 115static void addrconf_sysctl_unregister(struct inet6_dev *idev);
116#else
117static inline void addrconf_sysctl_register(struct inet6_dev *idev)
118{
119}
120
121static inline void addrconf_sysctl_unregister(struct inet6_dev *idev)
122{
123}
1da177e4
LT		 124#endif
125
126#ifdef CONFIG_IPV6_PRIVACY
eb7e0575
SD		 127static void __ipv6_regen_rndid(struct inet6_dev *idev);
128static void __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
1da177e4 129static void ipv6_regen_rndid(unsigned long data);
1da177e4
LT		 130#endif
131
1b34be74 132static int ipv6_generate_eui64(u8 *eui, struct net_device *dev);
1da177e4
LT		 133static int ipv6_count_addresses(struct inet6_dev *idev);
134
135/*
136 * Configured unicast address hash table
137 */
c2e21293 138static struct hlist_head inet6_addr_lst[IN6_ADDR_HSIZE];
5c578aed 139static DEFINE_SPINLOCK(addrconf_hash_lock);
1da177e4 140
1da177e4
LT		 141static void addrconf_verify(unsigned long);
142
8d06afab 143static DEFINE_TIMER(addr_chk_timer, addrconf_verify, 0, 0);
1da177e4
LT		 144static DEFINE_SPINLOCK(addrconf_verify_lock);
145
146static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
147static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
148
93d9b7d7
JP		 149static void addrconf_type_change(struct net_device *dev,
150 unsigned long event);
1da177e4
LT		 151static int addrconf_ifdown(struct net_device *dev, int how);
152
21caa662
RK		 153static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
154 int plen,
155 const struct net_device *dev,
156 u32 flags, u32 noflags);
157
cf22f9a2 158static void addrconf_dad_start(struct inet6_ifaddr *ifp);
1da177e4
LT		 159static void addrconf_dad_timer(unsigned long data);
160static void addrconf_dad_completed(struct inet6_ifaddr *ifp);
c5e33bdd 161static void addrconf_dad_run(struct inet6_dev *idev);
1da177e4
LT		 162static void addrconf_rs_timer(unsigned long data);
163static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
164static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
165
1ab1457c 166static void inet6_prefix_notify(int event, struct inet6_dev *idev,
1da177e4 167 struct prefix_info *pinfo);
3e81c6da
DM		 168static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
169 struct net_device *dev);
1da177e4 170
e041c683 171static ATOMIC_NOTIFIER_HEAD(inet6addr_chain);
1da177e4 172
888c848e 173static struct ipv6_devconf ipv6_devconf __read_mostly = {
1da177e4
LT		 174 .forwarding = 0,
175 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
176 .mtu6 = IPV6_MIN_MTU,
177 .accept_ra = 1,
178 .accept_redirects = 1,
179 .autoconf = 1,
180 .force_mld_version = 0,
181 .dad_transmits = 1,
182 .rtr_solicits = MAX_RTR_SOLICITATIONS,
183 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
184 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
185#ifdef CONFIG_IPV6_PRIVACY
186 .use_tempaddr = 0,
187 .temp_valid_lft = TEMP_VALID_LIFETIME,
188 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
189 .regen_max_retry = REGEN_MAX_RETRY,
190 .max_desync_factor = MAX_DESYNC_FACTOR,
191#endif
192 .max_addresses = IPV6_MAX_ADDRESSES,
65f5c7c1 193 .accept_ra_defrtr = 1,
c4fd30eb 194 .accept_ra_pinfo = 1,
930d6ff2
YH		 195#ifdef CONFIG_IPV6_ROUTER_PREF
196 .accept_ra_rtr_pref = 1,
52e16356 197 .rtr_probe_interval = 60 * HZ,
09c884d4
YH		 198#ifdef CONFIG_IPV6_ROUTE_INFO
199 .accept_ra_rt_info_max_plen = 0,
200#endif
930d6ff2 201#endif
fbea49e1 202 .proxy_ndp = 0,
0bcbc926 203 .accept_source_route = 0, /* we do not accept RH0 by default. */
778d80be 204 .disable_ipv6 = 0,
1b34be74 205 .accept_dad = 1,
1da177e4
LT		 206};
207
ab32ea5d 208static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
1da177e4
LT		 209 .forwarding = 0,
210 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
211 .mtu6 = IPV6_MIN_MTU,
212 .accept_ra = 1,
213 .accept_redirects = 1,
214 .autoconf = 1,
215 .dad_transmits = 1,
216 .rtr_solicits = MAX_RTR_SOLICITATIONS,
217 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
218 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
219#ifdef CONFIG_IPV6_PRIVACY
220 .use_tempaddr = 0,
221 .temp_valid_lft = TEMP_VALID_LIFETIME,
222 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
223 .regen_max_retry = REGEN_MAX_RETRY,
224 .max_desync_factor = MAX_DESYNC_FACTOR,
225#endif
226 .max_addresses = IPV6_MAX_ADDRESSES,
65f5c7c1 227 .accept_ra_defrtr = 1,
c4fd30eb 228 .accept_ra_pinfo = 1,
930d6ff2
YH		 229#ifdef CONFIG_IPV6_ROUTER_PREF
230 .accept_ra_rtr_pref = 1,
52e16356 231 .rtr_probe_interval = 60 * HZ,
09c884d4
YH		 232#ifdef CONFIG_IPV6_ROUTE_INFO
233 .accept_ra_rt_info_max_plen = 0,
234#endif
930d6ff2 235#endif
fbea49e1 236 .proxy_ndp = 0,
0bcbc926 237 .accept_source_route = 0, /* we do not accept RH0 by default. */
778d80be 238 .disable_ipv6 = 0,
1b34be74 239 .accept_dad = 1,
1da177e4
LT		 240};
241
242/* IPv6 Wildcard Address and Loopback Address defined by RFC2553 */
1da177e4 243const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT;
1da177e4 244const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT;
f3ee4010
YH		 245const struct in6_addr in6addr_linklocal_allnodes = IN6ADDR_LINKLOCAL_ALLNODES_INIT;
246const struct in6_addr in6addr_linklocal_allrouters = IN6ADDR_LINKLOCAL_ALLROUTERS_INIT;
1da177e4 247
f24e3d65 248/* Check if a valid qdisc is available */
05297949 249static inline bool addrconf_qdisc_ok(const struct net_device *dev)
f24e3d65 250{
05297949 251 return !qdisc_tx_is_noop(dev);
f24e3d65
MC		 252}
253
1da177e4
LT		 254static void addrconf_del_timer(struct inet6_ifaddr *ifp)
255{
256 if (del_timer(&ifp->timer))
257 __in6_ifa_put(ifp);
258}
259
e21e8467 260enum addrconf_timer_t {
1da177e4
LT		 261 AC_NONE,
262 AC_DAD,
263 AC_RS,
264};
265
266static void addrconf_mod_timer(struct inet6_ifaddr *ifp,
267 enum addrconf_timer_t what,
268 unsigned long when)
269{
270 if (!del_timer(&ifp->timer))
271 in6_ifa_hold(ifp);
272
273 switch (what) {
274 case AC_DAD:
275 ifp->timer.function = addrconf_dad_timer;
276 break;
277 case AC_RS:
278 ifp->timer.function = addrconf_rs_timer;
279 break;
e21e8467
SH		 280 default:
281 break;
1da177e4
LT		 282 }
283 ifp->timer.expires = jiffies + when;
284 add_timer(&ifp->timer);
285}
286
7f7d9a6b
HX		 287static int snmp6_alloc_dev(struct inet6_dev *idev)
288{
7d720c3e 289 if (snmp_mib_init((void __percpu **)idev->stats.ipv6,
1823e4c8
ED		 290 sizeof(struct ipstats_mib),
291 __alignof__(struct ipstats_mib)) < 0)
7f7d9a6b 292 goto err_ip;
be281e55
ED		 293 idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device),
294 GFP_KERNEL);
295 if (!idev->stats.icmpv6dev)
7f7d9a6b 296 goto err_icmp;
be281e55
ED		 297 idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device),
298 GFP_KERNEL);
299 if (!idev->stats.icmpv6msgdev)
14878f75 300 goto err_icmpmsg;
7f7d9a6b
HX		 301
302 return 0;
303
14878f75 304err_icmpmsg:
be281e55 305 kfree(idev->stats.icmpv6dev);
7f7d9a6b 306err_icmp:
7d720c3e 307 snmp_mib_free((void __percpu **)idev->stats.ipv6);
7f7d9a6b 308err_ip:
aaf70ec7 309 return -ENOMEM;
7f7d9a6b
HX		 310}
311
16910b98 312static void snmp6_free_dev(struct inet6_dev *idev)
7f7d9a6b 313{
be281e55
ED		 314 kfree(idev->stats.icmpv6msgdev);
315 kfree(idev->stats.icmpv6dev);
7d720c3e 316 snmp_mib_free((void __percpu **)idev->stats.ipv6);
7f7d9a6b
HX		 317}
318
1da177e4
LT		 319/* Nobody refers to this device, we may destroy it. */
320
321void in6_dev_finish_destroy(struct inet6_dev *idev)
322{
323 struct net_device *dev = idev->dev;
547b792c 324
502a2ffd 325 WARN_ON(!list_empty(&idev->addr_list));
547b792c
IJ		 326 WARN_ON(idev->mc_list != NULL);
327
1da177e4 328#ifdef NET_REFCNT_DEBUG
91df42be 329 pr_debug("%s: %s\n", __func__, dev ? dev->name : "NIL");
1da177e4
LT		 330#endif
331 dev_put(dev);
332 if (!idev->dead) {
f3213831 333 pr_warn("Freeing alive inet6 device %p\n", idev);
1da177e4
LT		 334 return;
335 }
336 snmp6_free_dev(idev);
38f57d1a 337 kfree_rcu(idev, rcu);
1da177e4 338}
7159039a
YH		 339EXPORT_SYMBOL(in6_dev_finish_destroy);
340
8e5e8f30 341static struct inet6_dev *ipv6_add_dev(struct net_device *dev)
1da177e4
LT		 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
f3213831 374 "%s: cannot allocate memory for statistics; dev=%s.\n",
0dc47877 375 __func__, dev->name));
322f74a4 376 neigh_parms_release(&nd_tbl, ndev->nd_parms);
8603e33d
RL		 377 dev_put(dev);
378 kfree(ndev);
322f74a4
IO		 379 return NULL;
380 }
1da177e4 381
322f74a4
IO		 382 if (snmp6_register_dev(ndev) < 0) {
383 ADBG((KERN_WARNING
f3213831 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
07a93626 400#if IS_ENABLED(CONFIG_IPV6_SIT)
b077d7ab 401 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
f3213831 402 pr_info("%s: Disabled Multicast RS\n", dev->name);
b077d7ab
YH		 403 ndev->cnf.rtr_solicits = 0;
404 }
405#endif
406
1da177e4 407#ifdef CONFIG_IPV6_PRIVACY
372e6c8f 408 INIT_LIST_HEAD(&ndev->tempaddr_list);
b24b8a24 409 setup_timer(&ndev->regen_timer, ipv6_regen_rndid, (unsigned long)ndev);
322f74a4
IO		 410 if ((dev->flags&IFF_LOOPBACK) ||
411 dev->type == ARPHRD_TUNNEL ||
9625ed72 412 dev->type == ARPHRD_TUNNEL6 ||
0be669bb 413 dev->type == ARPHRD_SIT ||
0be669bb 414 dev->type == ARPHRD_NONE) {
322f74a4
IO		 415 ndev->cnf.use_tempaddr = -1;
416 } else {
417 in6_dev_hold(ndev);
418 ipv6_regen_rndid((unsigned long) ndev);
419 }
1da177e4
LT		 420#endif
421
f24e3d65 422 if (netif_running(dev) && addrconf_qdisc_ok(dev))
53aadcc9
HX		 423 ndev->if_flags |= IF_READY;
424
322f74a4
IO		 425 ipv6_mc_init_dev(ndev);
426 ndev->tstamp = jiffies;
f52295a9 427 addrconf_sysctl_register(ndev);
30c4cf57 428 /* protected by rtnl_lock */
cf778b00 429 rcu_assign_pointer(dev->ip6_ptr, ndev);
d88ae4cc
YH		 430
431 /* Join all-node multicast group */
f3ee4010 432 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);
d88ae4cc 433
d6ddef9e 434 /* Join all-router multicast group if forwarding is set */
8b2aaede 435 if (ndev->cnf.forwarding && (dev->flags & IFF_MULTICAST))
d6ddef9e
LW		 436 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
437
1da177e4
LT		 438 return ndev;
439}
440
8e5e8f30 441static struct inet6_dev *ipv6_find_idev(struct net_device *dev)
1da177e4
LT		 442{
443 struct inet6_dev *idev;
444
445 ASSERT_RTNL();
446
e21e8467
SH		 447 idev = __in6_dev_get(dev);
448 if (!idev) {
449 idev = ipv6_add_dev(dev);
450 if (!idev)
1da177e4
LT		 451 return NULL;
452 }
c5e33bdd 453
1da177e4
LT		 454 if (dev->flags&IFF_UP)
455 ipv6_mc_up(idev);
456 return idev;
457}
458
f3a1bfb1
ND		 459static int inet6_netconf_msgsize_devconf(int type)
460{
461 int size = NLMSG_ALIGN(sizeof(struct netconfmsg))
462 + nla_total_size(4); /* NETCONFA_IFINDEX */
463
76f8f6cb
ND		 464 /* type -1 is used for ALL */
465 if (type == -1 || type == NETCONFA_FORWARDING)
f3a1bfb1 466 size += nla_total_size(4);
b1afce95 467#ifdef CONFIG_IPV6_MROUTE
d67b8c61
ND		 468 if (type == -1 || type == NETCONFA_MC_FORWARDING)
469 size += nla_total_size(4);
b1afce95 470#endif
f3a1bfb1
ND		 471
472 return size;
473}
474
475static int inet6_netconf_fill_devconf(struct sk_buff *skb, int ifindex,
476 struct ipv6_devconf *devconf, u32 portid,
477 u32 seq, int event, unsigned int flags,
478 int type)
479{
480 struct nlmsghdr *nlh;
481 struct netconfmsg *ncm;
482
483 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg),
484 flags);
485 if (nlh == NULL)
486 return -EMSGSIZE;
487
488 ncm = nlmsg_data(nlh);
489 ncm->ncm_family = AF_INET6;
490
491 if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0)
492 goto nla_put_failure;
493
76f8f6cb
ND		 494 /* type -1 is used for ALL */
495 if ((type == -1 || type == NETCONFA_FORWARDING) &&
f3a1bfb1
ND		 496 nla_put_s32(skb, NETCONFA_FORWARDING, devconf->forwarding) < 0)
497 goto nla_put_failure;
b1afce95 498#ifdef CONFIG_IPV6_MROUTE
d67b8c61
ND		 499 if ((type == -1 || type == NETCONFA_MC_FORWARDING) &&
500 nla_put_s32(skb, NETCONFA_MC_FORWARDING,
501 devconf->mc_forwarding) < 0)
502 goto nla_put_failure;
b1afce95 503#endif
f3a1bfb1
ND		 504 return nlmsg_end(skb, nlh);
505
506nla_put_failure:
507 nlmsg_cancel(skb, nlh);
508 return -EMSGSIZE;
509}
510
d67b8c61
ND		 511void inet6_netconf_notify_devconf(struct net *net, int type, int ifindex,
512 struct ipv6_devconf *devconf)
f3a1bfb1
ND		 513{
514 struct sk_buff *skb;
515 int err = -ENOBUFS;
516
517 skb = nlmsg_new(inet6_netconf_msgsize_devconf(type), GFP_ATOMIC);
518 if (skb == NULL)
519 goto errout;
520
521 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 0, 0,
522 RTM_NEWNETCONF, 0, type);
523 if (err < 0) {
524 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
525 WARN_ON(err == -EMSGSIZE);
526 kfree_skb(skb);
527 goto errout;
528 }
529 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_NETCONF, NULL, GFP_ATOMIC);
530 return;
531errout:
bd779028 532 rtnl_set_sk_err(net, RTNLGRP_IPV6_NETCONF, err);
f3a1bfb1
ND		 533}
534
76f8f6cb
ND		 535static const struct nla_policy devconf_ipv6_policy[NETCONFA_MAX+1] = {
536 [NETCONFA_IFINDEX] = { .len = sizeof(int) },
537 [NETCONFA_FORWARDING] = { .len = sizeof(int) },
538};
539
540static int inet6_netconf_get_devconf(struct sk_buff *in_skb,
541 struct nlmsghdr *nlh,
542 void *arg)
543{
544 struct net *net = sock_net(in_skb->sk);
545 struct nlattr *tb[NETCONFA_MAX+1];
546 struct netconfmsg *ncm;
547 struct sk_buff *skb;
548 struct ipv6_devconf *devconf;
549 struct inet6_dev *in6_dev;
550 struct net_device *dev;
551 int ifindex;
552 int err;
553
554 err = nlmsg_parse(nlh, sizeof(*ncm), tb, NETCONFA_MAX,
555 devconf_ipv6_policy);
556 if (err < 0)
557 goto errout;
558
559 err = EINVAL;
560 if (!tb[NETCONFA_IFINDEX])
561 goto errout;
562
563 ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]);
564 switch (ifindex) {
565 case NETCONFA_IFINDEX_ALL:
566 devconf = net->ipv6.devconf_all;
567 break;
568 case NETCONFA_IFINDEX_DEFAULT:
569 devconf = net->ipv6.devconf_dflt;
570 break;
571 default:
572 dev = __dev_get_by_index(net, ifindex);
573 if (dev == NULL)
574 goto errout;
575 in6_dev = __in6_dev_get(dev);
576 if (in6_dev == NULL)
577 goto errout;
578 devconf = &in6_dev->cnf;
579 break;
580 }
581
582 err = -ENOBUFS;
583 skb = nlmsg_new(inet6_netconf_msgsize_devconf(-1), GFP_ATOMIC);
584 if (skb == NULL)
585 goto errout;
586
587 err = inet6_netconf_fill_devconf(skb, ifindex, devconf,
588 NETLINK_CB(in_skb).portid,
589 nlh->nlmsg_seq, RTM_NEWNETCONF, 0,
590 -1);
591 if (err < 0) {
592 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
593 WARN_ON(err == -EMSGSIZE);
594 kfree_skb(skb);
595 goto errout;
596 }
597 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
598errout:
599 return err;
600}
601
1da177e4
LT		 602#ifdef CONFIG_SYSCTL
603static void dev_forward_change(struct inet6_dev *idev)
604{
605 struct net_device *dev;
606 struct inet6_ifaddr *ifa;
1da177e4
LT		 607
608 if (!idev)
609 return;
610 dev = idev->dev;
0187bdfb
BH		 611 if (idev->cnf.forwarding)
612 dev_disable_lro(dev);
1a940835 613 if (dev->flags & IFF_MULTICAST) {
1da177e4 614 if (idev->cnf.forwarding)
f3ee4010 615 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
1da177e4 616 else
f3ee4010 617 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
1da177e4 618 }
502a2ffd 619
620 list_for_each_entry(ifa, &idev->addr_list, if_list) {
2c12a74c
MW		 621 if (ifa->flags&IFA_F_TENTATIVE)
622 continue;
1da177e4
LT		 623 if (idev->cnf.forwarding)
624 addrconf_join_anycast(ifa);
625 else
626 addrconf_leave_anycast(ifa);
627 }
f3a1bfb1
ND		 628 inet6_netconf_notify_devconf(dev_net(dev), NETCONFA_FORWARDING,
629 dev->ifindex, &idev->cnf);
1da177e4
LT		 630}
631
632
e186932b 633static void addrconf_forward_change(struct net *net, __s32 newf)
1da177e4
LT		 634{
635 struct net_device *dev;
636 struct inet6_dev *idev;
637
4acd4945 638 for_each_netdev(net, dev) {
1da177e4
LT		 639 idev = __in6_dev_get(dev);
640 if (idev) {
e186932b
PE		 641 int changed = (!idev->cnf.forwarding) ^ (!newf);
642 idev->cnf.forwarding = newf;
1da177e4
LT		 643 if (changed)
644 dev_forward_change(idev);
645 }
1da177e4 646 }
1da177e4 647}
c8fecf22 648
013d97e9 649static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf)
c8fecf22 650{
bff16c2f 651 struct net *net;
013d97e9
FR		 652 int old;
653
654 if (!rtnl_trylock())
655 return restart_syscall();
bff16c2f
PE		 656
657 net = (struct net *)table->extra2;
013d97e9
FR		 658 old = *p;
659 *p = newf;
b325fddb 660
013d97e9 661 if (p == &net->ipv6.devconf_dflt->forwarding) {
f3a1bfb1
ND		 662 if ((!newf) ^ (!old))
663 inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING,
664 NETCONFA_IFINDEX_DEFAULT,
665 net->ipv6.devconf_dflt);
013d97e9
FR		 666 rtnl_unlock();
667 return 0;
88af182e 668 }
c8fecf22 669
e186932b 670 if (p == &net->ipv6.devconf_all->forwarding) {
e186932b
PE		 671 net->ipv6.devconf_dflt->forwarding = newf;
672 addrconf_forward_change(net, newf);
f3a1bfb1
ND		 673 if ((!newf) ^ (!old))
674 inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING,
675 NETCONFA_IFINDEX_ALL,
676 net->ipv6.devconf_all);
013d97e9 677 } else if ((!newf) ^ (!old))
c8fecf22 678 dev_forward_change((struct inet6_dev *)table->extra1);
0187bdfb 679 rtnl_unlock();
c8fecf22 680
013d97e9 681 if (newf)
7b4da532 682 rt6_purge_dflt_routers(net);
b325fddb 683 return 1;
c8fecf22 684}
1da177e4
LT		 685#endif
686
5c578aed 687/* Nobody refers to this ifaddr, destroy it */
1da177e4
LT		 688void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
689{
c2e21293 690 WARN_ON(!hlist_unhashed(&ifp->addr_lst));
547b792c 691
1da177e4 692#ifdef NET_REFCNT_DEBUG
91df42be 693 pr_debug("%s\n", __func__);
1da177e4
LT		 694#endif
695
696 in6_dev_put(ifp->idev);
697
698 if (del_timer(&ifp->timer))
e21e8467 699 pr_notice("Timer is still running, when freeing ifa=%p\n", ifp);
1da177e4 700
e9d3e084 701 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
f3213831 702 pr_warn("Freeing alive inet6 address %p\n", ifp);
1da177e4
LT		 703 return;
704 }
94e187c0 705 ip6_rt_put(ifp->rt);
1da177e4 706
e5785985 707 kfree_rcu(ifp, rcu);
1da177e4
LT		 708}
709
e55ffac6
BH		 710static void
711ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
712{
502a2ffd 713 struct list_head *p;
8a6ce0c0 714 int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
e55ffac6
BH		 715
716 /*
717 * Each device address list is sorted in order of scope -
718 * global before linklocal.
719 */
502a2ffd 720 list_for_each(p, &idev->addr_list) {
721 struct inet6_ifaddr *ifa
722 = list_entry(p, struct inet6_ifaddr, if_list);
8a6ce0c0 723 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
e55ffac6
BH		 724 break;
725 }
726
b54c9b98 727 list_add_tail(&ifp->if_list, p);
e55ffac6
BH		 728}
729
ddbe5032 730static u32 inet6_addr_hash(const struct in6_addr *addr)
3eb84f49 731{
ddbe5032 732 return hash_32(ipv6_addr_hash(addr), IN6_ADDR_HSIZE_SHIFT);
3eb84f49
YH		 733}
734
1da177e4
LT		 735/* On success it returns ifp with increased reference count */
736
737static struct inet6_ifaddr *
738ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, int pfxlen,
e431b8c0 739 int scope, u32 flags)
1da177e4
LT		 740{
741 struct inet6_ifaddr *ifa = NULL;
742 struct rt6_info *rt;
3a88a81d 743 unsigned int hash;
1da177e4 744 int err = 0;
d68b8270
YH		 745 int addr_type = ipv6_addr_type(addr);
746
747 if (addr_type == IPV6_ADDR_ANY ||
748 addr_type & IPV6_ADDR_MULTICAST ||
749 (!(idev->dev->flags & IFF_LOOPBACK) &&
750 addr_type & IPV6_ADDR_LOOPBACK))
751 return ERR_PTR(-EADDRNOTAVAIL);
1da177e4 752
8814c4b5 753 rcu_read_lock_bh();
1da177e4
LT		 754 if (idev->dead) {
755 err = -ENODEV; /*XXX*/
756 goto out2;
757 }
758
56d417b1 759 if (idev->cnf.disable_ipv6) {
9bdd8d40
BH		 760 err = -EACCES;
761 goto out2;
762 }
763
5c578aed 764 spin_lock(&addrconf_hash_lock);
1da177e4
LT		 765
766 /* Ignore adding duplicate addresses on an interface */
c346dca1 767 if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) {
1da177e4
LT		 768 ADBG(("ipv6_add_addr: already assigned\n"));
769 err = -EEXIST;
770 goto out;
771 }
772
322f74a4 773 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
1da177e4
LT		 774
775 if (ifa == NULL) {
776 ADBG(("ipv6_add_addr: malloc failed\n"));
777 err = -ENOBUFS;
778 goto out;
779 }
780
8f031519 781 rt = addrconf_dst_alloc(idev, addr, false);
1da177e4
LT		 782 if (IS_ERR(rt)) {
783 err = PTR_ERR(rt);
784 goto out;
785 }
786
4e3fd7a0 787 ifa->addr = *addr;
1da177e4
LT		 788
789 spin_lock_init(&ifa->lock);
e9d3e084 790 spin_lock_init(&ifa->state_lock);
1da177e4 791 init_timer(&ifa->timer);
c2e21293 792 INIT_HLIST_NODE(&ifa->addr_lst);
1da177e4
LT		 793 ifa->timer.data = (unsigned long) ifa;
794 ifa->scope = scope;
795 ifa->prefix_len = pfxlen;
796 ifa->flags = flags | IFA_F_TENTATIVE;
797 ifa->cstamp = ifa->tstamp = jiffies;
798
57f5f544
KF		 799 ifa->rt = rt;
800
1da177e4
LT		 801 ifa->idev = idev;
802 in6_dev_hold(idev);
803 /* For caller */
804 in6_ifa_hold(ifa);
805
806 /* Add to big hash table */
ddbe5032 807 hash = inet6_addr_hash(addr);
1da177e4 808
5c578aed 809 hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]);
5c578aed 810 spin_unlock(&addrconf_hash_lock);
1da177e4
LT		 811
812 write_lock(&idev->lock);
813 /* Add to inet6_dev unicast addr list. */
e55ffac6 814 ipv6_link_dev_addr(idev, ifa);
1da177e4
LT		 815
816#ifdef CONFIG_IPV6_PRIVACY
817 if (ifa->flags&IFA_F_TEMPORARY) {
372e6c8f 818 list_add(&ifa->tmp_list, &idev->tempaddr_list);
1da177e4
LT		 819 in6_ifa_hold(ifa);
820 }
821#endif
822
1da177e4
LT		 823 in6_ifa_hold(ifa);
824 write_unlock(&idev->lock);
825out2:
8814c4b5 826 rcu_read_unlock_bh();
1da177e4 827
fd92833a 828 if (likely(err == 0))
e041c683 829 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_UP, ifa);
1da177e4
LT		 830 else {
831 kfree(ifa);
832 ifa = ERR_PTR(err);
833 }
834
835 return ifa;
836out:
5c578aed 837 spin_unlock(&addrconf_hash_lock);
1da177e4
LT		 838 goto out2;
839}
840
841/* This function wants to get referenced ifp and releases it before return */
842
843static void ipv6_del_addr(struct inet6_ifaddr *ifp)
844{
502a2ffd 845 struct inet6_ifaddr *ifa, *ifn;
1da177e4 846 struct inet6_dev *idev = ifp->idev;
4c5ff6a6 847 int state;
1da177e4
LT		 848 int deleted = 0, onlink = 0;
849 unsigned long expires = jiffies;
850
4c5ff6a6
HX		 851 spin_lock_bh(&ifp->state_lock);
852 state = ifp->state;
e9d3e084 853 ifp->state = INET6_IFADDR_STATE_DEAD;
4c5ff6a6
HX		 854 spin_unlock_bh(&ifp->state_lock);
855
856 if (state == INET6_IFADDR_STATE_DEAD)
857 goto out;
1da177e4 858
5c578aed 859 spin_lock_bh(&addrconf_hash_lock);
860 hlist_del_init_rcu(&ifp->addr_lst);
5c578aed 861 spin_unlock_bh(&addrconf_hash_lock);
1da177e4
LT		 862
863 write_lock_bh(&idev->lock);
864#ifdef CONFIG_IPV6_PRIVACY
865 if (ifp->flags&IFA_F_TEMPORARY) {
372e6c8f 866 list_del(&ifp->tmp_list);
867 if (ifp->ifpub) {
868 in6_ifa_put(ifp->ifpub);
869 ifp->ifpub = NULL;
1da177e4 870 }
372e6c8f 871 __in6_ifa_put(ifp);
1da177e4
LT		 872 }
873#endif
874
502a2ffd 875 list_for_each_entry_safe(ifa, ifn, &idev->addr_list, if_list) {
1da177e4 876 if (ifa == ifp) {
502a2ffd 877 list_del_init(&ifp->if_list);
1da177e4 878 __in6_ifa_put(ifp);
502a2ffd 879
1da177e4
LT		 880 if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0)
881 break;
882 deleted = 1;
1d142804 883 continue;
1da177e4
LT		 884 } else if (ifp->flags & IFA_F_PERMANENT) {
885 if (ipv6_prefix_equal(&ifa->addr, &ifp->addr,
886 ifp->prefix_len)) {
887 if (ifa->flags & IFA_F_PERMANENT) {
888 onlink = 1;
889 if (deleted)
890 break;
891 } else {
892 unsigned long lifetime;
893
894 if (!onlink)
895 onlink = -1;
896
897 spin_lock(&ifa->lock);
4bed72e4
YH		 898
899 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
900 /*
901 * Note: Because this address is
902 * not permanent, lifetime <
903 * LONG_MAX / HZ here.
904 */
1da177e4
LT		 905 if (time_before(expires,
906 ifa->tstamp + lifetime * HZ))
907 expires = ifa->tstamp + lifetime * HZ;
908 spin_unlock(&ifa->lock);
909 }
910 }
911 }
912 }
913 write_unlock_bh(&idev->lock);
914
b2238566
AV		 915 addrconf_del_timer(ifp);
916
1da177e4
LT		 917 ipv6_ifa_notify(RTM_DELADDR, ifp);
918
e041c683 919 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifp);
1da177e4 920
1da177e4
LT		 921 /*
922 * Purge or update corresponding prefix
923 *
924 * 1) we don't purge prefix here if address was not permanent.
925 * prefix is managed by its own lifetime.
926 * 2) if there're no addresses, delete prefix.
927 * 3) if there're still other permanent address(es),
928 * corresponding prefix is still permanent.
929 * 4) otherwise, update prefix lifetime to the
930 * longest valid lifetime among the corresponding
931 * addresses on the device.
932 * Note: subsequent RA will update lifetime.
933 *
934 * --yoshfuji
935 */
936 if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) {
937 struct in6_addr prefix;
938 struct rt6_info *rt;
64c6d08e 939
1da177e4 940 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len);
1da177e4 941
21caa662
RK		 942 rt = addrconf_get_prefix_route(&prefix,
943 ifp->prefix_len,
944 ifp->idev->dev,
945 0, RTF_GATEWAY | RTF_DEFAULT);
946
947 if (rt) {
1da177e4 948 if (onlink == 0) {
e0a1ad73 949 ip6_del_rt(rt);
1da177e4
LT		 950 rt = NULL;
951 } else if (!(rt->rt6i_flags & RTF_EXPIRES)) {
1716a961 952 rt6_set_expires(rt, expires);
1da177e4
LT		 953 }
954 }
94e187c0 955 ip6_rt_put(rt);
1da177e4
LT		 956 }
957
c3968a85
DW		 958 /* clean up prefsrc entries */
959 rt6_remove_prefsrc(ifp);
4c5ff6a6 960out:
1da177e4
LT		 961 in6_ifa_put(ifp);
962}
963
964#ifdef CONFIG_IPV6_PRIVACY
965static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
966{
967 struct inet6_dev *idev = ifp->idev;
968 struct in6_addr addr, *tmpaddr;
76f793e3 969 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_tstamp, age;
eac55bf9 970 unsigned long regen_advance;
1da177e4
LT		 971 int tmp_plen;
972 int ret = 0;
973 int max_addresses;
95c385b4 974 u32 addr_flags;
76f793e3 975 unsigned long now = jiffies;
1da177e4
LT		 976
977 write_lock(&idev->lock);
978 if (ift) {
979 spin_lock_bh(&ift->lock);
980 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
981 spin_unlock_bh(&ift->lock);
982 tmpaddr = &addr;
983 } else {
984 tmpaddr = NULL;
985 }
986retry:
987 in6_dev_hold(idev);
988 if (idev->cnf.use_tempaddr <= 0) {
989 write_unlock(&idev->lock);
f3213831 990 pr_info("%s: use_tempaddr is disabled\n", __func__);
1da177e4
LT		 991 in6_dev_put(idev);
992 ret = -1;
993 goto out;
994 }
995 spin_lock_bh(&ifp->lock);
996 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
997 idev->cnf.use_tempaddr = -1; /*XXX*/
998 spin_unlock_bh(&ifp->lock);
999 write_unlock(&idev->lock);
f3213831
JP		 1000 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n",
1001 __func__);
1da177e4
LT		 1002 in6_dev_put(idev);
1003 ret = -1;
1004 goto out;
1005 }
1006 in6_ifa_hold(ifp);
1007 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
eb7e0575 1008 __ipv6_try_regen_rndid(idev, tmpaddr);
1da177e4 1009 memcpy(&addr.s6_addr[8], idev->rndid, 8);
76f793e3 1010 age = (now - ifp->tstamp) / HZ;
1da177e4
LT		 1011 tmp_valid_lft = min_t(__u32,
1012 ifp->valid_lft,
7a876b0e 1013 idev->cnf.temp_valid_lft + age);
1ab1457c
YH		 1014 tmp_prefered_lft = min_t(__u32,
1015 ifp->prefered_lft,
7a876b0e 1016 idev->cnf.temp_prefered_lft + age -
784e2710 1017 idev->cnf.max_desync_factor);
1da177e4
LT		 1018 tmp_plen = ifp->prefix_len;
1019 max_addresses = idev->cnf.max_addresses;
1da177e4
LT		 1020 tmp_tstamp = ifp->tstamp;
1021 spin_unlock_bh(&ifp->lock);
1022
eac55bf9
BB		 1023 regen_advance = idev->cnf.regen_max_retry *
1024 idev->cnf.dad_transmits *
1025 idev->nd_parms->retrans_time / HZ;
1da177e4 1026 write_unlock(&idev->lock);
95c385b4 1027
eac55bf9
BB		 1028 /* A temporary address is created only if this calculated Preferred
1029 * Lifetime is greater than REGEN_ADVANCE time units. In particular,
1030 * an implementation must not create a temporary address with a zero
1031 * Preferred Lifetime.
1032 */
1033 if (tmp_prefered_lft <= regen_advance) {
1034 in6_ifa_put(ifp);
1035 in6_dev_put(idev);
1036 ret = -1;
1037 goto out;
1038 }
1039
95c385b4
NH		 1040 addr_flags = IFA_F_TEMPORARY;
1041 /* set in addrconf_prefix_rcv() */
1042 if (ifp->flags & IFA_F_OPTIMISTIC)
1043 addr_flags |= IFA_F_OPTIMISTIC;
1044
1da177e4 1045 ift = !max_addresses ||
1ab1457c 1046 ipv6_count_addresses(idev) < max_addresses ?
1da177e4 1047 ipv6_add_addr(idev, &addr, tmp_plen,
95c385b4
NH		 1048 ipv6_addr_type(&addr)&IPV6_ADDR_SCOPE_MASK,
1049 addr_flags) : NULL;
3f0d2ba0 1050 if (IS_ERR_OR_NULL(ift)) {
1da177e4
LT		 1051 in6_ifa_put(ifp);
1052 in6_dev_put(idev);
f3213831 1053 pr_info("%s: retry temporary address regeneration\n", __func__);
1da177e4
LT		 1054 tmpaddr = &addr;
1055 write_lock(&idev->lock);
1056 goto retry;
1057 }
1058
1059 spin_lock_bh(&ift->lock);
1060 ift->ifpub = ifp;
1061 ift->valid_lft = tmp_valid_lft;
1062 ift->prefered_lft = tmp_prefered_lft;
76f793e3 1063 ift->cstamp = now;
1da177e4
LT		 1064 ift->tstamp = tmp_tstamp;
1065 spin_unlock_bh(&ift->lock);
1066
cf22f9a2 1067 addrconf_dad_start(ift);
1da177e4
LT		 1068 in6_ifa_put(ift);
1069 in6_dev_put(idev);
1070out:
1071 return ret;
1072}
1073#endif
1074
1075/*
072047e4 1076 * Choose an appropriate source address (RFC3484)
1da177e4 1077 */
a9b05723
YH		 1078enum {
1079 IPV6_SADDR_RULE_INIT = 0,
1080 IPV6_SADDR_RULE_LOCAL,
1081 IPV6_SADDR_RULE_SCOPE,
1082 IPV6_SADDR_RULE_PREFERRED,
1083#ifdef CONFIG_IPV6_MIP6
1084 IPV6_SADDR_RULE_HOA,
1085#endif
1086 IPV6_SADDR_RULE_OIF,
1087 IPV6_SADDR_RULE_LABEL,
1088#ifdef CONFIG_IPV6_PRIVACY
1089 IPV6_SADDR_RULE_PRIVACY,
1090#endif
1091 IPV6_SADDR_RULE_ORCHID,
1092 IPV6_SADDR_RULE_PREFIX,
1093 IPV6_SADDR_RULE_MAX
1094};
1095
072047e4 1096struct ipv6_saddr_score {
a9b05723
YH		 1097 int rule;
1098 int addr_type;
1099 struct inet6_ifaddr *ifa;
1100 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
1101 int scopedist;
1102 int matchlen;
072047e4
YH		 1103};
1104
a9b05723 1105struct ipv6_saddr_dst {
9acd9f3a 1106 const struct in6_addr *addr;
a9b05723
YH		 1107 int ifindex;
1108 int scope;
1109 int label;
7cbca67c 1110 unsigned int prefs;
a9b05723 1111};
072047e4 1112
b6f99a21 1113static inline int ipv6_saddr_preferred(int type)
1da177e4 1114{
45bb0060 1115 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
072047e4
YH		 1116 return 1;
1117 return 0;
1da177e4
LT		 1118}
1119
3de23255
BT		 1120static int ipv6_get_saddr_eval(struct net *net,
1121 struct ipv6_saddr_score *score,
a9b05723
YH		 1122 struct ipv6_saddr_dst *dst,
1123 int i)
1124{
1125 int ret;
1126
1127 if (i <= score->rule) {
1128 switch (i) {
1129 case IPV6_SADDR_RULE_SCOPE:
1130 ret = score->scopedist;
1131 break;
1132 case IPV6_SADDR_RULE_PREFIX:
1133 ret = score->matchlen;
1134 break;
1135 default:
1136 ret = !!test_bit(i, score->scorebits);
1137 }
1138 goto out;
1139 }
1140
1141 switch (i) {
1142 case IPV6_SADDR_RULE_INIT:
1143 /* Rule 0: remember if hiscore is not ready yet */
1144 ret = !!score->ifa;
1145 break;
1146 case IPV6_SADDR_RULE_LOCAL:
1147 /* Rule 1: Prefer same address */
1148 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1149 break;
1150 case IPV6_SADDR_RULE_SCOPE:
1151 /* Rule 2: Prefer appropriate scope
1152 *
1153 * ret
1154 * ^
1155 * -1 | d 15
1156 * ---+--+-+---> scope
1157 * |
1158 * | d is scope of the destination.
1159 * B-d | \
1160 * | \ <- smaller scope is better if
1161 * B-15 | \ if scope is enough for destinaion.
1162 * | ret = B - scope (-1 <= scope >= d <= 15).
1163 * d-C-1 | /
1164 * |/ <- greater is better
1165 * -C / if scope is not enough for destination.
1166 * /| ret = scope - C (-1 <= d < scope <= 15).
1167 *
1168 * d - C - 1 < B -15 (for all -1 <= d <= 15).
1169 * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1170 * Assume B = 0 and we get C > 29.
1171 */
1172 ret = __ipv6_addr_src_scope(score->addr_type);
1173 if (ret >= dst->scope)
1174 ret = -ret;
1175 else
1176 ret -= 128; /* 30 is enough */
1177 score->scopedist = ret;
1178 break;
1179 case IPV6_SADDR_RULE_PREFERRED:
1180 /* Rule 3: Avoid deprecated and optimistic addresses */
1181 ret = ipv6_saddr_preferred(score->addr_type) ||
1182 !(score->ifa->flags & (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC));
1183 break;
1184#ifdef CONFIG_IPV6_MIP6
1185 case IPV6_SADDR_RULE_HOA:
7cbca67c 1186 {
a9b05723 1187 /* Rule 4: Prefer home address */
7cbca67c
YH		 1188 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1189 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
a9b05723 1190 break;
7cbca67c 1191 }
a9b05723
YH		 1192#endif
1193 case IPV6_SADDR_RULE_OIF:
1194 /* Rule 5: Prefer outgoing interface */
1195 ret = (!dst->ifindex ||
1196 dst->ifindex == score->ifa->idev->dev->ifindex);
1197 break;
1198 case IPV6_SADDR_RULE_LABEL:
1199 /* Rule 6: Prefer matching label */
3de23255
BT		 1200 ret = ipv6_addr_label(net,
1201 &score->ifa->addr, score->addr_type,
a9b05723
YH		 1202 score->ifa->idev->dev->ifindex) == dst->label;
1203 break;
1204#ifdef CONFIG_IPV6_PRIVACY
1205 case IPV6_SADDR_RULE_PRIVACY:
7cbca67c 1206 {
a9b05723 1207 /* Rule 7: Prefer public address
25985edc 1208 * Note: prefer temporary address if use_tempaddr >= 2
a9b05723 1209 */
7cbca67c
YH		 1210 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1211 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1212 score->ifa->idev->cnf.use_tempaddr >= 2;
1213 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
a9b05723 1214 break;
7cbca67c 1215 }
a9b05723
YH		 1216#endif
1217 case IPV6_SADDR_RULE_ORCHID:
1218 /* Rule 8-: Prefer ORCHID vs ORCHID or
1219 * non-ORCHID vs non-ORCHID
1220 */
1221 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1222 ipv6_addr_orchid(dst->addr));
1223 break;
1224 case IPV6_SADDR_RULE_PREFIX:
1225 /* Rule 8: Use longest matching prefix */
91b4b04f
YH		 1226 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr);
1227 if (ret > score->ifa->prefix_len)
1228 ret = score->ifa->prefix_len;
1229 score->matchlen = ret;
a9b05723
YH		 1230 break;
1231 default:
1232 ret = 0;
1233 }
1234
1235 if (ret)
1236 __set_bit(i, score->scorebits);
1237 score->rule = i;
1238out:
1239 return ret;
1240}
1241
b3f644fc 1242int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev,
9acd9f3a 1243 const struct in6_addr *daddr, unsigned int prefs,
7cbca67c 1244 struct in6_addr *saddr)
1da177e4 1245{
a9b05723
YH		 1246 struct ipv6_saddr_score scores[2],
1247 *score = &scores[0], *hiscore = &scores[1];
a9b05723 1248 struct ipv6_saddr_dst dst;
072047e4 1249 struct net_device *dev;
a9b05723 1250 int dst_type;
1da177e4 1251
a9b05723
YH		 1252 dst_type = __ipv6_addr_type(daddr);
1253 dst.addr = daddr;
1254 dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1255 dst.scope = __ipv6_addr_src_scope(dst_type);
3de23255 1256 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
7cbca67c 1257 dst.prefs = prefs;
a9b05723
YH		 1258
1259 hiscore->rule = -1;
1260 hiscore->ifa = NULL;
1da177e4 1261
8814c4b5 1262 rcu_read_lock();
1da177e4 1263
c6d14c84 1264 for_each_netdev_rcu(net, dev) {
072047e4 1265 struct inet6_dev *idev;
072047e4 1266
a9b05723 1267 /* Candidate Source Address (section 4)
072047e4
YH		 1268 * - multicast and link-local destination address,
1269 * the set of candidate source address MUST only
1270 * include addresses assigned to interfaces
1271 * belonging to the same link as the outgoing
1272 * interface.
1273 * (- For site-local destination addresses, the
1274 * set of candidate source addresses MUST only
1275 * include addresses assigned to interfaces
1276 * belonging to the same site as the outgoing
1277 * interface.)
1278 */
a9b05723
YH		 1279 if (((dst_type & IPV6_ADDR_MULTICAST) ||
1280 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL) &&
1281 dst.ifindex && dev->ifindex != dst.ifindex)
072047e4 1282 continue;
1da177e4 1283
1da177e4 1284 idev = __in6_dev_get(dev);
072047e4
YH		 1285 if (!idev)
1286 continue;
1287
1288 read_lock_bh(&idev->lock);
502a2ffd 1289 list_for_each_entry(score->ifa, &idev->addr_list, if_list) {
a9b05723 1290 int i;
072047e4 1291
a9b05723 1292 /*
6b3ae80a
YH		 1293 * - Tentative Address (RFC2462 section 5.4)
1294 * - A tentative address is not considered
1295 * "assigned to an interface" in the traditional
95c385b4 1296 * sense, unless it is also flagged as optimistic.
6b3ae80a 1297 * - Candidate Source Address (section 4)
072047e4
YH		 1298 * - In any case, anycast addresses, multicast
1299 * addresses, and the unspecified address MUST
1300 * NOT be included in a candidate set.
1301 */
a9b05723
YH		 1302 if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1303 (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
6b3ae80a 1304 continue;
a9b05723
YH		 1305
1306 score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1307
1308 if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1309 score->addr_type & IPV6_ADDR_MULTICAST)) {
072047e4 1310 LIMIT_NETDEBUG(KERN_DEBUG
3b6d821c 1311 "ADDRCONF: unspecified / multicast address "
072047e4
YH		 1312 "assigned as unicast address on %s",
1313 dev->name);
1314 continue;
1315 }
1316
a9b05723
YH		 1317 score->rule = -1;
1318 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1319
1320 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1321 int minihiscore, miniscore;
1322
3de23255
BT		 1323 minihiscore = ipv6_get_saddr_eval(net, hiscore, &dst, i);
1324 miniscore = ipv6_get_saddr_eval(net, score, &dst, i);
a9b05723
YH		 1325
1326 if (minihiscore > miniscore) {
1327 if (i == IPV6_SADDR_RULE_SCOPE &&
1328 score->scopedist > 0) {
1329 /*
1330 * special case:
1331 * each remaining entry
1332 * has too small (not enough)
1333 * scope, because ifa entries
1334 * are sorted by their scope
1335 * values.
1336 */
1337 goto try_nextdev;
1338 }
1339 break;
1340 } else if (minihiscore < miniscore) {
a9b05723
YH		 1341 if (hiscore->ifa)
1342 in6_ifa_put(hiscore->ifa);
1343
1344 in6_ifa_hold(score->ifa);
1345
a0bffffc 1346 swap(hiscore, score);
a9b05723
YH		 1347
1348 /* restore our iterator */
1349 score->ifa = hiscore->ifa;
1350
1351 break;
1da177e4 1352 }
072047e4 1353 }
1da177e4 1354 }
a9b05723 1355try_nextdev:
072047e4 1356 read_unlock_bh(&idev->lock);
1da177e4 1357 }
8814c4b5 1358 rcu_read_unlock();
1da177e4 1359
a9b05723 1360 if (!hiscore->ifa)
072047e4 1361 return -EADDRNOTAVAIL;
1ab1457c 1362
4e3fd7a0 1363 *saddr = hiscore->ifa->addr;
a9b05723 1364 in6_ifa_put(hiscore->ifa);
072047e4 1365 return 0;
1da177e4 1366}
5e5f3f0f 1367EXPORT_SYMBOL(ipv6_dev_get_saddr);
1da177e4 1368
95c385b4
NH		 1369int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1370 unsigned char banned_flags)
1da177e4
LT		 1371{
1372 struct inet6_dev *idev;
1373 int err = -EADDRNOTAVAIL;
1374
8814c4b5 1375 rcu_read_lock();
e21e8467
SH		 1376 idev = __in6_dev_get(dev);
1377 if (idev) {
1da177e4
LT		 1378 struct inet6_ifaddr *ifp;
1379
1380 read_lock_bh(&idev->lock);
502a2ffd 1381 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1382 if (ifp->scope == IFA_LINK &&
1383 !(ifp->flags & banned_flags)) {
4e3fd7a0 1384 *addr = ifp->addr;
1da177e4
LT		 1385 err = 0;
1386 break;
1387 }
1388 }
1389 read_unlock_bh(&idev->lock);
1390 }
8814c4b5 1391 rcu_read_unlock();
1da177e4
LT		 1392 return err;
1393}
1394
1395static int ipv6_count_addresses(struct inet6_dev *idev)
1396{
1397 int cnt = 0;
1398 struct inet6_ifaddr *ifp;
1399
1400 read_lock_bh(&idev->lock);
502a2ffd 1401 list_for_each_entry(ifp, &idev->addr_list, if_list)
1da177e4
LT		 1402 cnt++;
1403 read_unlock_bh(&idev->lock);
1404 return cnt;
1405}
1406
b71d1d42 1407int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
bfeade08 1408 struct net_device *dev, int strict)
1da177e4 1409{
eedf042a 1410 struct inet6_ifaddr *ifp;
c2e21293 1411 struct hlist_node *node;
ddbe5032 1412 unsigned int hash = inet6_addr_hash(addr);
1da177e4 1413
5c578aed 1414 rcu_read_lock_bh();
1415 hlist_for_each_entry_rcu(ifp, node, &inet6_addr_lst[hash], addr_lst) {
878628fb 1416 if (!net_eq(dev_net(ifp->idev->dev), net))
bfeade08 1417 continue;
1da177e4 1418 if (ipv6_addr_equal(&ifp->addr, addr) &&
eedf042a
SH		 1419 !(ifp->flags&IFA_F_TENTATIVE) &&
1420 (dev == NULL || ifp->idev->dev == dev ||
1421 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) {
1422 rcu_read_unlock_bh();
1423 return 1;
1da177e4
LT		 1424 }
1425 }
5c578aed 1426
eedf042a
SH		 1427 rcu_read_unlock_bh();
1428 return 0;
1da177e4 1429}
7159039a
YH		 1430EXPORT_SYMBOL(ipv6_chk_addr);
1431
3e81c6da
DM		 1432static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1433 struct net_device *dev)
1da177e4 1434{
ddbe5032 1435 unsigned int hash = inet6_addr_hash(addr);
c2e21293 1436 struct inet6_ifaddr *ifp;
1437 struct hlist_node *node;
1da177e4 1438
c2e21293 1439 hlist_for_each_entry(ifp, node, &inet6_addr_lst[hash], addr_lst) {
878628fb 1440 if (!net_eq(dev_net(ifp->idev->dev), net))
06bfe655 1441 continue;
1da177e4
LT		 1442 if (ipv6_addr_equal(&ifp->addr, addr)) {
1443 if (dev == NULL || ifp->idev->dev == dev)
3e81c6da 1444 return true;
1da177e4
LT		 1445 }
1446 }
3e81c6da 1447 return false;
1da177e4
LT		 1448}
1449
b71d1d42 1450int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev)
52eeeb84
YH		 1451{
1452 struct inet6_dev *idev;
1453 struct inet6_ifaddr *ifa;
1454 int onlink;
1455
1456 onlink = 0;
1457 rcu_read_lock();
1458 idev = __in6_dev_get(dev);
1459 if (idev) {
1460 read_lock_bh(&idev->lock);
502a2ffd 1461 list_for_each_entry(ifa, &idev->addr_list, if_list) {
52eeeb84
YH		 1462 onlink = ipv6_prefix_equal(addr, &ifa->addr,
1463 ifa->prefix_len);
1464 if (onlink)
1465 break;
1466 }
1467 read_unlock_bh(&idev->lock);
1468 }
1469 rcu_read_unlock();
1470 return onlink;
1471}
52eeeb84
YH		 1472EXPORT_SYMBOL(ipv6_chk_prefix);
1473
9acd9f3a 1474struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1cab3da6 1475 struct net_device *dev, int strict)
1da177e4 1476{
b79d1d54 1477 struct inet6_ifaddr *ifp, *result = NULL;
ddbe5032 1478 unsigned int hash = inet6_addr_hash(addr);
b79d1d54 1479 struct hlist_node *node;
1da177e4 1480
5c578aed 1481 rcu_read_lock_bh();
4f70ecca 1482 hlist_for_each_entry_rcu_bh(ifp, node, &inet6_addr_lst[hash], addr_lst) {
878628fb 1483 if (!net_eq(dev_net(ifp->idev->dev), net))
1cab3da6 1484 continue;
1da177e4
LT		 1485 if (ipv6_addr_equal(&ifp->addr, addr)) {
1486 if (dev == NULL || ifp->idev->dev == dev ||
1487 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
b79d1d54 1488 result = ifp;
1da177e4
LT		 1489 in6_ifa_hold(ifp);
1490 break;
1491 }
1492 }
1493 }
5c578aed 1494 rcu_read_unlock_bh();
1da177e4 1495
b79d1d54 1496 return result;
1da177e4
LT		 1497}
1498
1da177e4
LT		 1499/* Gets referenced address, destroys ifaddr */
1500
cc411d0b 1501static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
1da177e4 1502{
1da177e4
LT		 1503 if (ifp->flags&IFA_F_PERMANENT) {
1504 spin_lock_bh(&ifp->lock);
1505 addrconf_del_timer(ifp);
1506 ifp->flags |= IFA_F_TENTATIVE;
cc411d0b
BH		 1507 if (dad_failed)
1508 ifp->flags |= IFA_F_DADFAILED;
1da177e4 1509 spin_unlock_bh(&ifp->lock);
e2577a06
HX		 1510 if (dad_failed)
1511 ipv6_ifa_notify(0, ifp);
1da177e4
LT		 1512 in6_ifa_put(ifp);
1513#ifdef CONFIG_IPV6_PRIVACY
1514 } else if (ifp->flags&IFA_F_TEMPORARY) {
1515 struct inet6_ifaddr *ifpub;
1516 spin_lock_bh(&ifp->lock);
1517 ifpub = ifp->ifpub;
1518 if (ifpub) {
1519 in6_ifa_hold(ifpub);
1520 spin_unlock_bh(&ifp->lock);
1521 ipv6_create_tempaddr(ifpub, ifp);
1522 in6_ifa_put(ifpub);
1523 } else {
1524 spin_unlock_bh(&ifp->lock);
1525 }
1526 ipv6_del_addr(ifp);
1527#endif
1528 } else
1529 ipv6_del_addr(ifp);
1530}
1531
f2344a13
HX		 1532static int addrconf_dad_end(struct inet6_ifaddr *ifp)
1533{
1534 int err = -ENOENT;
1535
1536 spin_lock(&ifp->state_lock);
1537 if (ifp->state == INET6_IFADDR_STATE_DAD) {
1538 ifp->state = INET6_IFADDR_STATE_POSTDAD;
1539 err = 0;
1540 }
1541 spin_unlock(&ifp->state_lock);
1542
1543 return err;
1544}
1545
3c21edbd
YH		 1546void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1547{
1b34be74 1548 struct inet6_dev *idev = ifp->idev;
9bdd8d40 1549
853dc2e0
UB		 1550 if (addrconf_dad_end(ifp)) {
1551 in6_ifa_put(ifp);
f2344a13 1552 return;
853dc2e0 1553 }
f2344a13 1554
e87cc472
JP		 1555 net_info_ratelimited("%s: IPv6 duplicate address %pI6c detected!\n",
1556 ifp->idev->dev->name, &ifp->addr);
9bdd8d40 1557
1b34be74
YH		 1558 if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6) {
1559 struct in6_addr addr;
1560
1561 addr.s6_addr32[0] = htonl(0xfe800000);
1562 addr.s6_addr32[1] = 0;
1563
1564 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
1565 ipv6_addr_equal(&ifp->addr, &addr)) {
1566 /* DAD failed for link-local based on MAC address */
1567 idev->cnf.disable_ipv6 = 1;
9bdd8d40 1568
f3213831 1569 pr_info("%s: IPv6 being disabled!\n",
9bdd8d40 1570 ifp->idev->dev->name);
1b34be74
YH		 1571 }
1572 }
1573
cc411d0b 1574 addrconf_dad_stop(ifp, 1);
3c21edbd 1575}
1da177e4
LT		 1576
1577/* Join to solicited addr multicast group. */
1578
b71d1d42 1579void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr)
1da177e4
LT		 1580{
1581 struct in6_addr maddr;
1582
1583 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1584 return;
1585
1586 addrconf_addr_solict_mult(addr, &maddr);
1587 ipv6_dev_mc_inc(dev, &maddr);
1588}
1589
b71d1d42 1590void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr)
1da177e4
LT		 1591{
1592 struct in6_addr maddr;
1593
1594 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1595 return;
1596
1597 addrconf_addr_solict_mult(addr, &maddr);
1598 __ipv6_dev_mc_dec(idev, &maddr);
1599}
1600
20380731 1601static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1da177e4
LT		 1602{
1603 struct in6_addr addr;
2bda8a0c
BM		 1604 if (ifp->prefix_len == 127) /* RFC 6164 */
1605 return;
1da177e4
LT		 1606 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1607 if (ipv6_addr_any(&addr))
1608 return;
1609 ipv6_dev_ac_inc(ifp->idev->dev, &addr);
1610}
1611
20380731 1612static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1da177e4
LT		 1613{
1614 struct in6_addr addr;
32019e65
YH		 1615 if (ifp->prefix_len == 127) /* RFC 6164 */
1616 return;
1da177e4
LT		 1617 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1618 if (ipv6_addr_any(&addr))
1619 return;
1620 __ipv6_dev_ac_dec(ifp->idev, &addr);
1621}
1622
073a8e0e
YH		 1623static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
1624{
1625 if (dev->addr_len != ETH_ALEN)
1626 return -1;
1627 memcpy(eui, dev->dev_addr, 3);
1628 memcpy(eui + 5, dev->dev_addr + 3, 3);
1629
1630 /*
1631 * The zSeries OSA network cards can be shared among various
1632 * OS instances, but the OSA cards have only one MAC address.
1633 * This leads to duplicate address conflicts in conjunction
1634 * with IPv6 if more than one instance uses the same card.
1635 *
1636 * The driver for these cards can deliver a unique 16-bit
1637 * identifier for each instance sharing the same card. It is
1638 * placed instead of 0xFFFE in the interface identifier. The
1639 * "u" bit of the interface identifier is not inverted in this
1640 * case. Hence the resulting interface identifier has local
1641 * scope according to RFC2373.
1642 */
1643 if (dev->dev_id) {
1644 eui[3] = (dev->dev_id >> 8) & 0xFF;
1645 eui[4] = dev->dev_id & 0xFF;
1646 } else {
1647 eui[3] = 0xFF;
1648 eui[4] = 0xFE;
1649 eui[0] ^= 2;
1650 }
1651 return 0;
1652}
1653
06a4c1c5 1654static int addrconf_ifid_eui64(u8 *eui, struct net_device *dev)
1655{
1656 if (dev->addr_len != IEEE802154_ADDR_LEN)
1657 return -1;
1658 memcpy(eui, dev->dev_addr, 8);
5e98a36e 1659 eui[0] ^= 2;
06a4c1c5 1660 return 0;
1661}
1662
073a8e0e
YH		 1663static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1664{
1665 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1666 if (dev->addr_len != ARCNET_ALEN)
1667 return -1;
1668 memset(eui, 0, 7);
8e5e8f30 1669 eui[7] = *(u8 *)dev->dev_addr;
073a8e0e
YH		 1670 return 0;
1671}
1672
1673static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1674{
1675 if (dev->addr_len != INFINIBAND_ALEN)
1676 return -1;
1677 memcpy(eui, dev->dev_addr + 12, 8);
1678 eui[0] |= 2;
1679 return 0;
1680}
1681
c61393ea 1682static int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
dfd982ba 1683{
9af28511
SH		 1684 if (addr == 0)
1685 return -1;
dfd982ba
YH		 1686 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
1687 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
1688 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
1689 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
1690 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
1691 ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
1692 eui[1] = 0;
1693 eui[2] = 0x5E;
1694 eui[3] = 0xFE;
1695 memcpy(eui + 4, &addr, 4);
1696 return 0;
1697}
dfd982ba
YH		 1698
1699static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
1700{
1701 if (dev->priv_flags & IFF_ISATAP)
1702 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1703 return -1;
1704}
1705
aee80b54 1706static int addrconf_ifid_gre(u8 *eui, struct net_device *dev)
1707{
1708 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1709}
1710
1da177e4
LT		 1711static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1712{
1713 switch (dev->type) {
1714 case ARPHRD_ETHER:
1715 case ARPHRD_FDDI:
073a8e0e 1716 return addrconf_ifid_eui48(eui, dev);
1da177e4 1717 case ARPHRD_ARCNET:
073a8e0e 1718 return addrconf_ifid_arcnet(eui, dev);
1da177e4 1719 case ARPHRD_INFINIBAND:
073a8e0e 1720 return addrconf_ifid_infiniband(eui, dev);
c7dc89c0 1721 case ARPHRD_SIT:
dfd982ba 1722 return addrconf_ifid_sit(eui, dev);
aee80b54 1723 case ARPHRD_IPGRE:
1724 return addrconf_ifid_gre(eui, dev);
06a4c1c5 1725 case ARPHRD_IEEE802154:
1726 return addrconf_ifid_eui64(eui, dev);
1da177e4
LT		 1727 }
1728 return -1;
1729}
1730
1731static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1732{
1733 int err = -1;
1734 struct inet6_ifaddr *ifp;
1735
1736 read_lock_bh(&idev->lock);
502a2ffd 1737 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1da177e4
LT		 1738 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1739 memcpy(eui, ifp->addr.s6_addr+8, 8);
1740 err = 0;
1741 break;
1742 }
1743 }
1744 read_unlock_bh(&idev->lock);
1745 return err;
1746}
1747
1748#ifdef CONFIG_IPV6_PRIVACY
1749/* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
eb7e0575 1750static void __ipv6_regen_rndid(struct inet6_dev *idev)
1da177e4 1751{
1da177e4 1752regen:
955189ef 1753 get_random_bytes(idev->rndid, sizeof(idev->rndid));
1da177e4 1754 idev->rndid[0] &= ~0x02;
1da177e4
LT		 1755
1756 /*
1757 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1758 * check if generated address is not inappropriate
1759 *
1760 * - Reserved subnet anycast (RFC 2526)
1761 * 11111101 11....11 1xxxxxxx
c7dc89c0 1762 * - ISATAP (RFC4214) 6.1
1da177e4
LT		 1763 * 00-00-5E-FE-xx-xx-xx-xx
1764 * - value 0
1765 * - XXX: already assigned to an address on the device
1766 */
1ab1457c 1767 if (idev->rndid[0] == 0xfd &&
1da177e4
LT		 1768 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1769 (idev->rndid[7]&0x80))
1770 goto regen;
1771 if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1772 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1773 goto regen;
1774 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1775 goto regen;
1776 }
1da177e4
LT		 1777}
1778
1779static void ipv6_regen_rndid(unsigned long data)
1780{
1781 struct inet6_dev *idev = (struct inet6_dev *) data;
1782 unsigned long expires;
1783
8814c4b5 1784 rcu_read_lock_bh();
1da177e4
LT		 1785 write_lock_bh(&idev->lock);
1786
1787 if (idev->dead)
1788 goto out;
1789
eb7e0575 1790 __ipv6_regen_rndid(idev);
1ab1457c 1791
1da177e4 1792 expires = jiffies +
1ab1457c 1793 idev->cnf.temp_prefered_lft * HZ -
784e2710
BH		 1794 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time -
1795 idev->cnf.max_desync_factor * HZ;
1da177e4 1796 if (time_before(expires, jiffies)) {
f3213831
JP		 1797 pr_warn("%s: too short regeneration interval; timer disabled for %s\n",
1798 __func__, idev->dev->name);
1da177e4
LT		 1799 goto out;
1800 }
1801
1802 if (!mod_timer(&idev->regen_timer, expires))
1803 in6_dev_hold(idev);
1804
1805out:
1806 write_unlock_bh(&idev->lock);
8814c4b5 1807 rcu_read_unlock_bh();
1da177e4
LT		 1808 in6_dev_put(idev);
1809}
1810
eb7e0575 1811static void __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr)
8e5e8f30 1812{
1da177e4 1813 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
eb7e0575 1814 __ipv6_regen_rndid(idev);
1da177e4
LT		 1815}
1816#endif
1817
1818/*
1819 * Add prefix route.
1820 */
1821
1822static void
1823addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
e431b8c0 1824 unsigned long expires, u32 flags)
1da177e4 1825{
86872cb5
TG		 1826 struct fib6_config cfg = {
1827 .fc_table = RT6_TABLE_PREFIX,
1828 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1829 .fc_ifindex = dev->ifindex,
1830 .fc_expires = expires,
1831 .fc_dst_len = plen,
1832 .fc_flags = RTF_UP | flags,
c346dca1 1833 .fc_nlinfo.nl_net = dev_net(dev),
f410a1fb 1834 .fc_protocol = RTPROT_KERNEL,
86872cb5 1835 };
1da177e4 1836
4e3fd7a0 1837 cfg.fc_dst = *pfx;
1da177e4
LT		 1838
1839 /* Prevent useless cloning on PtP SIT.
1840 This thing is done here expecting that the whole
1841 class of non-broadcast devices need not cloning.
1842 */
07a93626 1843#if IS_ENABLED(CONFIG_IPV6_SIT)
86872cb5
TG		 1844 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
1845 cfg.fc_flags |= RTF_NONEXTHOP;
0be669bb 1846#endif
1da177e4 1847
86872cb5 1848 ip6_route_add(&cfg);
1da177e4
LT		 1849}
1850
14ef37b6
AH		 1851
1852static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
1853 int plen,
1854 const struct net_device *dev,
1855 u32 flags, u32 noflags)
1856{
1857 struct fib6_node *fn;
1858 struct rt6_info *rt = NULL;
1859 struct fib6_table *table;
1860
1861 table = fib6_get_table(dev_net(dev), RT6_TABLE_PREFIX);
1862 if (table == NULL)
1863 return NULL;
1864
5744dd9b 1865 read_lock_bh(&table->tb6_lock);
14ef37b6
AH		 1866 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0);
1867 if (!fn)
1868 goto out;
1869 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
d1918542 1870 if (rt->dst.dev->ifindex != dev->ifindex)
14ef37b6
AH		 1871 continue;
1872 if ((rt->rt6i_flags & flags) != flags)
1873 continue;
85da53bf 1874 if ((rt->rt6i_flags & noflags) != 0)
14ef37b6
AH		 1875 continue;
1876 dst_hold(&rt->dst);
1877 break;
1878 }
1879out:
5744dd9b 1880 read_unlock_bh(&table->tb6_lock);
14ef37b6
AH		 1881 return rt;
1882}
1883
1884
1da177e4
LT		 1885/* Create "default" multicast route to the interface */
1886
1887static void addrconf_add_mroute(struct net_device *dev)
1888{
86872cb5
TG		 1889 struct fib6_config cfg = {
1890 .fc_table = RT6_TABLE_LOCAL,
1891 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1892 .fc_ifindex = dev->ifindex,
1893 .fc_dst_len = 8,
1894 .fc_flags = RTF_UP,
c346dca1 1895 .fc_nlinfo.nl_net = dev_net(dev),
86872cb5
TG		 1896 };
1897
1898 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
1899
1900 ip6_route_add(&cfg);
1da177e4
LT		 1901}
1902
07a93626 1903#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4
LT		 1904static void sit_route_add(struct net_device *dev)
1905{
86872cb5
TG		 1906 struct fib6_config cfg = {
1907 .fc_table = RT6_TABLE_MAIN,
1908 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1909 .fc_ifindex = dev->ifindex,
1910 .fc_dst_len = 96,
1911 .fc_flags = RTF_UP | RTF_NONEXTHOP,
c346dca1 1912 .fc_nlinfo.nl_net = dev_net(dev),
86872cb5 1913 };
1da177e4
LT		 1914
1915 /* prefix length - 96 bits "::d.d.d.d" */
86872cb5 1916 ip6_route_add(&cfg);
1da177e4 1917}
0be669bb 1918#endif
1da177e4 1919
1da177e4
LT		 1920static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
1921{
1922 struct inet6_dev *idev;
1923
1924 ASSERT_RTNL();
1925
e21e8467
SH		 1926 idev = ipv6_find_idev(dev);
1927 if (!idev)
64e724f6
BH		 1928 return ERR_PTR(-ENOBUFS);
1929
1930 if (idev->cnf.disable_ipv6)
1931 return ERR_PTR(-EACCES);
1da177e4
LT		 1932
1933 /* Add default multicast route */
4af04aba
LW		 1934 if (!(dev->flags & IFF_LOOPBACK))
1935 addrconf_add_mroute(dev);
1da177e4 1936
1da177e4
LT		 1937 return idev;
1938}
1939
e6bff995 1940void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao)
1da177e4
LT		 1941{
1942 struct prefix_info *pinfo;
1943 __u32 valid_lft;
1944 __u32 prefered_lft;
1945 int addr_type;
1da177e4 1946 struct inet6_dev *in6_dev;
56d417b1 1947 struct net *net = dev_net(dev);
1da177e4
LT		 1948
1949 pinfo = (struct prefix_info *) opt;
1ab1457c 1950
1da177e4
LT		 1951 if (len < sizeof(struct prefix_info)) {
1952 ADBG(("addrconf: prefix option too short\n"));
1953 return;
1954 }
1ab1457c 1955
1da177e4
LT		 1956 /*
1957 * Validation checks ([ADDRCONF], page 19)
1958 */
1959
1960 addr_type = ipv6_addr_type(&pinfo->prefix);
1961
1962 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
1963 return;
1964
1965 valid_lft = ntohl(pinfo->valid);
1966 prefered_lft = ntohl(pinfo->prefered);
1967
1968 if (prefered_lft > valid_lft) {
e87cc472 1969 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n");
1da177e4
LT		 1970 return;
1971 }
1972
1973 in6_dev = in6_dev_get(dev);
1974
1975 if (in6_dev == NULL) {
e87cc472
JP		 1976 net_dbg_ratelimited("addrconf: device %s not configured\n",
1977 dev->name);
1da177e4
LT		 1978 return;
1979 }
1980
1981 /*
1982 * Two things going on here:
1983 * 1) Add routes for on-link prefixes
1984 * 2) Configure prefixes with the auto flag set
1985 */
1986
4bed72e4
YH		 1987 if (pinfo->onlink) {
1988 struct rt6_info *rt;
1989 unsigned long rt_expires;
1990
6f704992
YH		 1991 /* Avoid arithmetic overflow. Really, we could
1992 * save rt_expires in seconds, likely valid_lft,
1993 * but it would require division in fib gc, that it
1994 * not good.
1995 */
4bed72e4
YH		 1996 if (HZ > USER_HZ)
1997 rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
1998 else
1999 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
3dd4bc68 2000
4bed72e4
YH		 2001 if (addrconf_finite_timeout(rt_expires))
2002 rt_expires *= HZ;
1da177e4 2003
14ef37b6
AH		 2004 rt = addrconf_get_prefix_route(&pinfo->prefix,
2005 pinfo->prefix_len,
2006 dev,
2007 RTF_ADDRCONF | RTF_PREFIX_RT,
2008 RTF_GATEWAY | RTF_DEFAULT);
1da177e4 2009
14ef37b6 2010 if (rt) {
6f704992
YH		 2011 /* Autoconf prefix route */
2012 if (valid_lft == 0) {
2013 ip6_del_rt(rt);
2014 rt = NULL;
4bed72e4 2015 } else if (addrconf_finite_timeout(rt_expires)) {
6f704992 2016 /* not infinity */
1716a961 2017 rt6_set_expires(rt, jiffies + rt_expires);
6f704992 2018 } else {
1716a961 2019 rt6_clean_expires(rt);
1da177e4
LT		 2020 }
2021 } else if (valid_lft) {
6f704992 2022 clock_t expires = 0;
4bed72e4
YH		 2023 int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
2024 if (addrconf_finite_timeout(rt_expires)) {
6f704992
YH		 2025 /* not infinity */
2026 flags |= RTF_EXPIRES;
2027 expires = jiffies_to_clock_t(rt_expires);
2028 }
1da177e4 2029 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
6f704992 2030 dev, expires, flags);
1da177e4 2031 }
94e187c0 2032 ip6_rt_put(rt);
1da177e4
LT		 2033 }
2034
2035 /* Try to figure out our local address for this prefix */
2036
2037 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
8e5e8f30 2038 struct inet6_ifaddr *ifp;
1da177e4
LT		 2039 struct in6_addr addr;
2040 int create = 0, update_lft = 0;
2041
2042 if (pinfo->prefix_len == 64) {
2043 memcpy(&addr, &pinfo->prefix, 8);
2044 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
2045 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
2046 in6_dev_put(in6_dev);
2047 return;
2048 }
2049 goto ok;
2050 }
e87cc472
JP		 2051 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n",
2052 pinfo->prefix_len);
1da177e4
LT		 2053 in6_dev_put(in6_dev);
2054 return;
2055
2056ok:
2057
53b7997f 2058 ifp = ipv6_get_ifaddr(net, &addr, dev, 1);
1da177e4
LT		 2059
2060 if (ifp == NULL && valid_lft) {
2061 int max_addresses = in6_dev->cnf.max_addresses;
95c385b4
NH		 2062 u32 addr_flags = 0;
2063
2064#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2065 if (in6_dev->cnf.optimistic_dad &&
e6bff995 2066 !net->ipv6.devconf_all->forwarding && sllao)
95c385b4
NH		 2067 addr_flags = IFA_F_OPTIMISTIC;
2068#endif
1da177e4
LT		 2069
2070 /* Do not allow to create too much of autoconfigured
2071 * addresses; this would be too easy way to crash kernel.
2072 */
2073 if (!max_addresses ||
2074 ipv6_count_addresses(in6_dev) < max_addresses)
2075 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len,
95c385b4
NH		 2076 addr_type&IPV6_ADDR_SCOPE_MASK,
2077 addr_flags);
1da177e4 2078
3f0d2ba0 2079 if (IS_ERR_OR_NULL(ifp)) {
1da177e4
LT		 2080 in6_dev_put(in6_dev);
2081 return;
2082 }
2083
2084 update_lft = create = 1;
2085 ifp->cstamp = jiffies;
cf22f9a2 2086 addrconf_dad_start(ifp);
1da177e4
LT		 2087 }
2088
2089 if (ifp) {
2090 int flags;
2091 unsigned long now;
2092#ifdef CONFIG_IPV6_PRIVACY
2093 struct inet6_ifaddr *ift;
2094#endif
2095 u32 stored_lft;
2096
2097 /* update lifetime (RFC2462 5.5.3 e) */
2098 spin_lock(&ifp->lock);
2099 now = jiffies;
2100 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
2101 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
2102 else
2103 stored_lft = 0;
2104 if (!update_lft && stored_lft) {
2105 if (valid_lft > MIN_VALID_LIFETIME ||
2106 valid_lft > stored_lft)
2107 update_lft = 1;
2108 else if (stored_lft <= MIN_VALID_LIFETIME) {
2109 /* valid_lft <= stored_lft is always true */
a1ed0526
BH		 2110 /*
2111 * RFC 4862 Section 5.5.3e:
2112 * "Note that the preferred lifetime of
2113 * the corresponding address is always
2114 * reset to the Preferred Lifetime in
2115 * the received Prefix Information
2116 * option, regardless of whether the
2117 * valid lifetime is also reset or
2118 * ignored."
2119 *
2120 * So if the preferred lifetime in
2121 * this advertisement is different
2122 * than what we have stored, but the
2123 * valid lifetime is invalid, just
2124 * reset prefered_lft.
2125 *
2126 * We must set the valid lifetime
2127 * to the stored lifetime since we'll
2128 * be updating the timestamp below,
2129 * else we'll set it back to the
25985edc 2130 * minimum.
a1ed0526
BH		 2131 */
2132 if (prefered_lft != ifp->prefered_lft) {
2133 valid_lft = stored_lft;
2134 update_lft = 1;
2135 }
1da177e4
LT		 2136 } else {
2137 valid_lft = MIN_VALID_LIFETIME;
2138 if (valid_lft < prefered_lft)
2139 prefered_lft = valid_lft;
2140 update_lft = 1;
2141 }
2142 }
2143
2144 if (update_lft) {
2145 ifp->valid_lft = valid_lft;
2146 ifp->prefered_lft = prefered_lft;
2147 ifp->tstamp = now;
2148 flags = ifp->flags;
2149 ifp->flags &= ~IFA_F_DEPRECATED;
2150 spin_unlock(&ifp->lock);
2151
2152 if (!(flags&IFA_F_TENTATIVE))
2153 ipv6_ifa_notify(0, ifp);
2154 } else
2155 spin_unlock(&ifp->lock);
2156
2157#ifdef CONFIG_IPV6_PRIVACY
2158 read_lock_bh(&in6_dev->lock);
2159 /* update all temporary addresses in the list */
76f793e3
LC		 2160 list_for_each_entry(ift, &in6_dev->tempaddr_list,
2161 tmp_list) {
2162 int age, max_valid, max_prefered;
2163
c6fbfac2
BB		 2164 if (ifp != ift->ifpub)
2165 continue;
2166
76f793e3
LC		 2167 /*
2168 * RFC 4941 section 3.3:
2169 * If a received option will extend the lifetime
2170 * of a public address, the lifetimes of
2171 * temporary addresses should be extended,
2172 * subject to the overall constraint that no
2173 * temporary addresses should ever remain
2174 * "valid" or "preferred" for a time longer than
2175 * (TEMP_VALID_LIFETIME) or
2176 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR),
2177 * respectively.
2178 */
2179 age = (now - ift->cstamp) / HZ;
2180 max_valid = in6_dev->cnf.temp_valid_lft - age;
2181 if (max_valid < 0)
2182 max_valid = 0;
2183
2184 max_prefered = in6_dev->cnf.temp_prefered_lft -
2185 in6_dev->cnf.max_desync_factor -
2186 age;
2187 if (max_prefered < 0)
2188 max_prefered = 0;
2189
2190 if (valid_lft > max_valid)
2191 valid_lft = max_valid;
2192
2193 if (prefered_lft > max_prefered)
2194 prefered_lft = max_prefered;
2195
1da177e4
LT		 2196 spin_lock(&ift->lock);
2197 flags = ift->flags;
76f793e3
LC		 2198 ift->valid_lft = valid_lft;
2199 ift->prefered_lft = prefered_lft;
2200 ift->tstamp = now;
2201 if (prefered_lft > 0)
2202 ift->flags &= ~IFA_F_DEPRECATED;
2203
1da177e4
LT		 2204 spin_unlock(&ift->lock);
2205 if (!(flags&IFA_F_TENTATIVE))
2206 ipv6_ifa_notify(0, ift);
2207 }
2208
aed65501 2209 if ((create || list_empty(&in6_dev->tempaddr_list)) && in6_dev->cnf.use_tempaddr > 0) {
1da177e4 2210 /*
76f793e3
LC		 2211 * When a new public address is created as
2212 * described in [ADDRCONF], also create a new
2213 * temporary address. Also create a temporary
2214 * address if it's enabled but no temporary
2215 * address currently exists.
1da177e4 2216 */
1ab1457c 2217 read_unlock_bh(&in6_dev->lock);
1da177e4
LT		 2218 ipv6_create_tempaddr(ifp, NULL);
2219 } else {
2220 read_unlock_bh(&in6_dev->lock);
2221 }
2222#endif
2223 in6_ifa_put(ifp);
2224 addrconf_verify(0);
2225 }
2226 }
2227 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
2228 in6_dev_put(in6_dev);
2229}
2230
2231/*
2232 * Set destination address.
2233 * Special case for SIT interfaces where we create a new "virtual"
2234 * device.
2235 */
af284937 2236int addrconf_set_dstaddr(struct net *net, void __user *arg)
1da177e4
LT		 2237{
2238 struct in6_ifreq ireq;
2239 struct net_device *dev;
2240 int err = -EINVAL;
2241
2242 rtnl_lock();
2243
2244 err = -EFAULT;
2245 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2246 goto err_exit;
2247
af284937 2248 dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
1da177e4
LT		 2249
2250 err = -ENODEV;
2251 if (dev == NULL)
2252 goto err_exit;
2253
07a93626 2254#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4 2255 if (dev->type == ARPHRD_SIT) {
5bc3eb7e 2256 const struct net_device_ops *ops = dev->netdev_ops;
1da177e4 2257 struct ifreq ifr;
1da177e4
LT		 2258 struct ip_tunnel_parm p;
2259
2260 err = -EADDRNOTAVAIL;
2261 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2262 goto err_exit;
2263
2264 memset(&p, 0, sizeof(p));
2265 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2266 p.iph.saddr = 0;
2267 p.iph.version = 4;
2268 p.iph.ihl = 5;
2269 p.iph.protocol = IPPROTO_IPV6;
2270 p.iph.ttl = 64;
d20b3109 2271 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
1da177e4 2272
5bc3eb7e
SH		 2273 if (ops->ndo_do_ioctl) {
2274 mm_segment_t oldfs = get_fs();
2275
2276 set_fs(KERNEL_DS);
2277 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2278 set_fs(oldfs);
2279 } else
2280 err = -EOPNOTSUPP;
1da177e4
LT		 2281
2282 if (err == 0) {
2283 err = -ENOBUFS;
af284937
DL		 2284 dev = __dev_get_by_name(net, p.name);
2285 if (!dev)
1da177e4
LT		 2286 goto err_exit;
2287 err = dev_open(dev);
2288 }
2289 }
0be669bb 2290#endif
1da177e4
LT		 2291
2292err_exit:
2293 rtnl_unlock();
2294 return err;
2295}
2296
2297/*
2298 * Manual configuration of address on an interface
2299 */
b71d1d42 2300static int inet6_addr_add(struct net *net, int ifindex, const struct in6_addr *pfx,
24ef0da7 2301 unsigned int plen, __u8 ifa_flags, __u32 prefered_lft,
af284937 2302 __u32 valid_lft)
1da177e4
LT		 2303{
2304 struct inet6_ifaddr *ifp;
2305 struct inet6_dev *idev;
2306 struct net_device *dev;
2307 int scope;
6f704992
YH		 2308 u32 flags;
2309 clock_t expires;
4bed72e4 2310 unsigned long timeout;
1da177e4
LT		 2311
2312 ASSERT_RTNL();
1ab1457c 2313
24ef0da7
TG		 2314 if (plen > 128)
2315 return -EINVAL;
2316
0778769d
NT		 2317 /* check the lifetime */
2318 if (!valid_lft || prefered_lft > valid_lft)
2319 return -EINVAL;
2320
af284937
DL		 2321 dev = __dev_get_by_index(net, ifindex);
2322 if (!dev)
1da177e4 2323 return -ENODEV;
1ab1457c 2324
64e724f6
BH		 2325 idev = addrconf_add_dev(dev);
2326 if (IS_ERR(idev))
2327 return PTR_ERR(idev);
1da177e4
LT		 2328
2329 scope = ipv6_addr_scope(pfx);
2330
4bed72e4
YH		 2331 timeout = addrconf_timeout_fixup(valid_lft, HZ);
2332 if (addrconf_finite_timeout(timeout)) {
2333 expires = jiffies_to_clock_t(timeout * HZ);
2334 valid_lft = timeout;
6f704992 2335 flags = RTF_EXPIRES;
4bed72e4
YH		 2336 } else {
2337 expires = 0;
2338 flags = 0;
2339 ifa_flags |= IFA_F_PERMANENT;
6f704992 2340 }
0778769d 2341
4bed72e4
YH		 2342 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
2343 if (addrconf_finite_timeout(timeout)) {
2344 if (timeout == 0)
2345 ifa_flags |= IFA_F_DEPRECATED;
2346 prefered_lft = timeout;
2347 }
0778769d
NT		 2348
2349 ifp = ipv6_add_addr(idev, pfx, plen, scope, ifa_flags);
2350
1da177e4 2351 if (!IS_ERR(ifp)) {
06aebfb7 2352 spin_lock_bh(&ifp->lock);
0778769d
NT		 2353 ifp->valid_lft = valid_lft;
2354 ifp->prefered_lft = prefered_lft;
2355 ifp->tstamp = jiffies;
06aebfb7 2356 spin_unlock_bh(&ifp->lock);
0778769d 2357
46d48046 2358 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
6f704992 2359 expires, flags);
95c385b4
NH		 2360 /*
2361 * Note that section 3.1 of RFC 4429 indicates
2362 * that the Optimistic flag should not be set for
2363 * manually configured addresses
2364 */
cf22f9a2 2365 addrconf_dad_start(ifp);
1da177e4 2366 in6_ifa_put(ifp);
0778769d 2367 addrconf_verify(0);
1da177e4
LT		 2368 return 0;
2369 }
2370
2371 return PTR_ERR(ifp);
2372}
2373
b71d1d42 2374static int inet6_addr_del(struct net *net, int ifindex, const struct in6_addr *pfx,
24ef0da7 2375 unsigned int plen)
1da177e4
LT		 2376{
2377 struct inet6_ifaddr *ifp;
2378 struct inet6_dev *idev;
2379 struct net_device *dev;
1ab1457c 2380
24ef0da7
TG		 2381 if (plen > 128)
2382 return -EINVAL;
2383
af284937
DL		 2384 dev = __dev_get_by_index(net, ifindex);
2385 if (!dev)
1da177e4
LT		 2386 return -ENODEV;
2387
2388 if ((idev = __in6_dev_get(dev)) == NULL)
2389 return -ENXIO;
2390
2391 read_lock_bh(&idev->lock);
502a2ffd 2392 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1da177e4
LT		 2393 if (ifp->prefix_len == plen &&
2394 ipv6_addr_equal(pfx, &ifp->addr)) {
2395 in6_ifa_hold(ifp);
2396 read_unlock_bh(&idev->lock);
1ab1457c 2397
1da177e4
LT		 2398 ipv6_del_addr(ifp);
2399
2400 /* If the last address is deleted administratively,
2401 disable IPv6 on this interface.
2402 */
502a2ffd 2403 if (list_empty(&idev->addr_list))
1da177e4
LT		 2404 addrconf_ifdown(idev->dev, 1);
2405 return 0;
2406 }
2407 }
2408 read_unlock_bh(&idev->lock);
2409 return -EADDRNOTAVAIL;
2410}
2411
2412
af284937 2413int addrconf_add_ifaddr(struct net *net, void __user *arg)
1da177e4
LT		 2414{
2415 struct in6_ifreq ireq;
2416 int err;
1ab1457c 2417
af31f412 2418 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1da177e4 2419 return -EPERM;
1ab1457c 2420
1da177e4
LT		 2421 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2422 return -EFAULT;
2423
2424 rtnl_lock();
af284937
DL		 2425 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2426 ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2427 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
1da177e4
LT		 2428 rtnl_unlock();
2429 return err;
2430}
2431
af284937 2432int addrconf_del_ifaddr(struct net *net, void __user *arg)
1da177e4
LT		 2433{
2434 struct in6_ifreq ireq;
2435 int err;
1ab1457c 2436
af31f412 2437 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1da177e4
LT		 2438 return -EPERM;
2439
2440 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2441 return -EFAULT;
2442
2443 rtnl_lock();
af284937
DL		 2444 err = inet6_addr_del(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2445 ireq.ifr6_prefixlen);
1da177e4
LT		 2446 rtnl_unlock();
2447 return err;
2448}
2449
b5f348e5
IJ		 2450static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
2451 int plen, int scope)
2452{
2453 struct inet6_ifaddr *ifp;
2454
2455 ifp = ipv6_add_addr(idev, addr, plen, scope, IFA_F_PERMANENT);
2456 if (!IS_ERR(ifp)) {
2457 spin_lock_bh(&ifp->lock);
2458 ifp->flags &= ~IFA_F_TENTATIVE;
2459 spin_unlock_bh(&ifp->lock);
2460 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2461 in6_ifa_put(ifp);
2462 }
2463}
2464
07a93626 2465#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4
LT		 2466static void sit_add_v4_addrs(struct inet6_dev *idev)
2467{
1da177e4
LT		 2468 struct in6_addr addr;
2469 struct net_device *dev;
c346dca1 2470 struct net *net = dev_net(idev->dev);
1da177e4
LT		 2471 int scope;
2472
2473 ASSERT_RTNL();
2474
2475 memset(&addr, 0, sizeof(struct in6_addr));
2476 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2477
2478 if (idev->dev->flags&IFF_POINTOPOINT) {
2479 addr.s6_addr32[0] = htonl(0xfe800000);
2480 scope = IFA_LINK;
2481 } else {
2482 scope = IPV6_ADDR_COMPATv4;
2483 }
2484
2485 if (addr.s6_addr32[3]) {
b5f348e5 2486 add_addr(idev, &addr, 128, scope);
1da177e4
LT		 2487 return;
2488 }
2489
6fda7350 2490 for_each_netdev(net, dev) {
8e5e8f30 2491 struct in_device *in_dev = __in_dev_get_rtnl(dev);
1da177e4 2492 if (in_dev && (dev->flags & IFF_UP)) {
8e5e8f30 2493 struct in_ifaddr *ifa;
1da177e4
LT		 2494
2495 int flag = scope;
2496
2497 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2498 int plen;
2499
2500 addr.s6_addr32[3] = ifa->ifa_local;
2501
2502 if (ifa->ifa_scope == RT_SCOPE_LINK)
2503 continue;
2504 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2505 if (idev->dev->flags&IFF_POINTOPOINT)
2506 continue;
2507 flag |= IFA_HOST;
2508 }
2509 if (idev->dev->flags&IFF_POINTOPOINT)
2510 plen = 64;
2511 else
2512 plen = 96;
2513
b5f348e5 2514 add_addr(idev, &addr, plen, flag);
1da177e4
LT		 2515 }
2516 }
1ab1457c 2517 }
1da177e4 2518}
0be669bb 2519#endif
1da177e4
LT		 2520
2521static void init_loopback(struct net_device *dev)
2522{
2523 struct inet6_dev *idev;
1da177e4
LT		 2524
2525 /* ::1 */
2526
2527 ASSERT_RTNL();
2528
2529 if ((idev = ipv6_find_idev(dev)) == NULL) {
91df42be 2530 pr_debug("%s: add_dev failed\n", __func__);
1da177e4
LT		 2531 return;
2532 }
2533
b5f348e5 2534 add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
1da177e4
LT		 2535}
2536
b71d1d42 2537static void addrconf_add_linklocal(struct inet6_dev *idev, const struct in6_addr *addr)
1da177e4 2538{
8e5e8f30 2539 struct inet6_ifaddr *ifp;
95c385b4
NH		 2540 u32 addr_flags = IFA_F_PERMANENT;
2541
2542#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2543 if (idev->cnf.optimistic_dad &&
702beb87 2544 !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
95c385b4
NH		 2545 addr_flags |= IFA_F_OPTIMISTIC;
2546#endif
1da177e4 2547
95c385b4
NH		 2548
2549 ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, addr_flags);
1da177e4 2550 if (!IS_ERR(ifp)) {
46d48046 2551 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
cf22f9a2 2552 addrconf_dad_start(ifp);
1da177e4
LT		 2553 in6_ifa_put(ifp);
2554 }
2555}
2556
2557static void addrconf_dev_config(struct net_device *dev)
2558{
2559 struct in6_addr addr;
8e5e8f30 2560 struct inet6_dev *idev;
1da177e4
LT		 2561
2562 ASSERT_RTNL();
2563
74235a25
HX		 2564 if ((dev->type != ARPHRD_ETHER) &&
2565 (dev->type != ARPHRD_FDDI) &&
74235a25 2566 (dev->type != ARPHRD_ARCNET) &&
06a4c1c5 2567 (dev->type != ARPHRD_INFINIBAND) &&
2568 (dev->type != ARPHRD_IEEE802154)) {
74235a25
HX		 2569 /* Alas, we support only Ethernet autoconfiguration. */
2570 return;
2571 }
2572
1da177e4 2573 idev = addrconf_add_dev(dev);
64e724f6 2574 if (IS_ERR(idev))
1da177e4
LT		 2575 return;
2576
2577 memset(&addr, 0, sizeof(struct in6_addr));
2578 addr.s6_addr32[0] = htonl(0xFE800000);
2579
2580 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
2581 addrconf_add_linklocal(idev, &addr);
2582}
2583
07a93626 2584#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4
LT		 2585static void addrconf_sit_config(struct net_device *dev)
2586{
2587 struct inet6_dev *idev;
2588
2589 ASSERT_RTNL();
2590
1ab1457c
YH		 2591 /*
2592 * Configure the tunnel with one of our IPv4
2593 * addresses... we should configure all of
1da177e4
LT		 2594 * our v4 addrs in the tunnel
2595 */
2596
2597 if ((idev = ipv6_find_idev(dev)) == NULL) {
91df42be 2598 pr_debug("%s: add_dev failed\n", __func__);
1da177e4
LT		 2599 return;
2600 }
2601
c7dc89c0
FT		 2602 if (dev->priv_flags & IFF_ISATAP) {
2603 struct in6_addr addr;
2604
2605 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
2606 addrconf_prefix_route(&addr, 64, dev, 0, 0);
2607 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2608 addrconf_add_linklocal(idev, &addr);
2609 return;
2610 }
2611
1da177e4
LT		 2612 sit_add_v4_addrs(idev);
2613
62b54dd9 2614 if (dev->flags&IFF_POINTOPOINT)
1da177e4 2615 addrconf_add_mroute(dev);
62b54dd9 2616 else
1da177e4
LT		 2617 sit_route_add(dev);
2618}
0be669bb 2619#endif
1da177e4 2620
07a93626 2621#if IS_ENABLED(CONFIG_NET_IPGRE)
aee80b54 2622static void addrconf_gre_config(struct net_device *dev)
2623{
2624 struct inet6_dev *idev;
2625 struct in6_addr addr;
2626
f3213831 2627 pr_info("%s(%s)\n", __func__, dev->name);
aee80b54 2628
2629 ASSERT_RTNL();
2630
2631 if ((idev = ipv6_find_idev(dev)) == NULL) {
91df42be 2632 pr_debug("%s: add_dev failed\n", __func__);
aee80b54 2633 return;
2634 }
2635
2636 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
2637 addrconf_prefix_route(&addr, 64, dev, 0, 0);
2638
2639 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2640 addrconf_add_linklocal(idev, &addr);
2641}
2642#endif
2643
1da177e4
LT		 2644static inline int
2645ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev)
2646{
2647 struct in6_addr lladdr;
2648
95c385b4 2649 if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) {
1da177e4
LT		 2650 addrconf_add_linklocal(idev, &lladdr);
2651 return 0;
2652 }
2653 return -1;
2654}
2655
2656static void ip6_tnl_add_linklocal(struct inet6_dev *idev)
2657{
2658 struct net_device *link_dev;
c346dca1 2659 struct net *net = dev_net(idev->dev);
1da177e4
LT		 2660
2661 /* first try to inherit the link-local address from the link device */
2662 if (idev->dev->iflink &&
6fda7350 2663 (link_dev = __dev_get_by_index(net, idev->dev->iflink))) {
1da177e4
LT		 2664 if (!ipv6_inherit_linklocal(idev, link_dev))
2665 return;
2666 }
2667 /* then try to inherit it from any device */
6fda7350 2668 for_each_netdev(net, link_dev) {
1da177e4
LT		 2669 if (!ipv6_inherit_linklocal(idev, link_dev))
2670 return;
2671 }
91df42be 2672 pr_debug("init ip6-ip6: add_linklocal failed\n");
1da177e4
LT		 2673}
2674
2675/*
2676 * Autoconfigure tunnel with a link-local address so routing protocols,
2677 * DHCPv6, MLD etc. can be run over the virtual link
2678 */
2679
2680static void addrconf_ip6_tnl_config(struct net_device *dev)
2681{
2682 struct inet6_dev *idev;
2683
2684 ASSERT_RTNL();
2685
e21e8467 2686 idev = addrconf_add_dev(dev);
64e724f6 2687 if (IS_ERR(idev)) {
91df42be 2688 pr_debug("init ip6-ip6: add_dev failed\n");
1da177e4
LT		 2689 return;
2690 }
2691 ip6_tnl_add_linklocal(idev);
1da177e4
LT		 2692}
2693
1ab1457c 2694static int addrconf_notify(struct notifier_block *this, unsigned long event,
8e5e8f30 2695 void *data)
1da177e4
LT		 2696{
2697 struct net_device *dev = (struct net_device *) data;
748e2d93 2698 struct inet6_dev *idev = __in6_dev_get(dev);
c5e33bdd 2699 int run_pending = 0;
b217d616 2700 int err;
1da177e4 2701
e21e8467 2702 switch (event) {
45ba9dd2 2703 case NETDEV_REGISTER:
74235a25 2704 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
45ba9dd2
YH		 2705 idev = ipv6_add_dev(dev);
2706 if (!idev)
b217d616 2707 return notifier_from_errno(-ENOMEM);
45ba9dd2
YH		 2708 }
2709 break;
bcdd553f 2710
1da177e4 2711 case NETDEV_UP:
3c21edbd 2712 case NETDEV_CHANGE:
c2edacf8
JV		 2713 if (dev->flags & IFF_SLAVE)
2714 break;
2715
3c21edbd 2716 if (event == NETDEV_UP) {
f24e3d65 2717 if (!addrconf_qdisc_ok(dev)) {
3c21edbd 2718 /* device is not ready yet. */
f3213831 2719 pr_info("ADDRCONF(NETDEV_UP): %s: link is not ready\n",
3c21edbd
YH		 2720 dev->name);
2721 break;
2722 }
99081049 2723
d31c7b8f
EP		 2724 if (!idev && dev->mtu >= IPV6_MIN_MTU)
2725 idev = ipv6_add_dev(dev);
2726
e3ec6cfc 2727 if (idev) {
99081049 2728 idev->if_flags |= IF_READY;
e3ec6cfc
BT		 2729 run_pending = 1;
2730 }
3c21edbd 2731 } else {
f24e3d65 2732 if (!addrconf_qdisc_ok(dev)) {
3c21edbd
YH		 2733 /* device is still not ready. */
2734 break;
2735 }
2736
2737 if (idev) {
bcdd553f 2738 if (idev->if_flags & IF_READY)
3c21edbd
YH		 2739 /* device is already configured. */
2740 break;
3c21edbd
YH		 2741 idev->if_flags |= IF_READY;
2742 }
2743
f3213831
JP		 2744 pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n",
2745 dev->name);
3c21edbd 2746
c5e33bdd 2747 run_pending = 1;
3c21edbd
YH		 2748 }
2749
e21e8467 2750 switch (dev->type) {
07a93626 2751#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4
LT		 2752 case ARPHRD_SIT:
2753 addrconf_sit_config(dev);
2754 break;
aee80b54 2755#endif
07a93626 2756#if IS_ENABLED(CONFIG_NET_IPGRE)
aee80b54 2757 case ARPHRD_IPGRE:
2758 addrconf_gre_config(dev);
2759 break;
0be669bb 2760#endif
1da177e4
LT		 2761 case ARPHRD_TUNNEL6:
2762 addrconf_ip6_tnl_config(dev);
2763 break;
2764 case ARPHRD_LOOPBACK:
2765 init_loopback(dev);
2766 break;
2767
2768 default:
2769 addrconf_dev_config(dev);
2770 break;
3ff50b79 2771 }
bcdd553f 2772
1da177e4 2773 if (idev) {
c5e33bdd
YH		 2774 if (run_pending)
2775 addrconf_dad_run(idev);
2776
bcdd553f
SH		 2777 /*
2778 * If the MTU changed during the interface down,
2779 * when the interface up, the changed MTU must be
2780 * reflected in the idev as well as routers.
1da177e4 2781 */
bcdd553f
SH		 2782 if (idev->cnf.mtu6 != dev->mtu &&
2783 dev->mtu >= IPV6_MIN_MTU) {
1da177e4
LT		 2784 rt6_mtu_change(dev, dev->mtu);
2785 idev->cnf.mtu6 = dev->mtu;
2786 }
2787 idev->tstamp = jiffies;
2788 inet6_ifinfo_notify(RTM_NEWLINK, idev);
bcdd553f
SH		 2789
2790 /*
2791 * If the changed mtu during down is lower than
2792 * IPV6_MIN_MTU stop IPv6 on this interface.
1da177e4
LT		 2793 */
2794 if (dev->mtu < IPV6_MIN_MTU)
bcdd553f 2795 addrconf_ifdown(dev, 1);
1da177e4
LT		 2796 }
2797 break;
2798
2799 case NETDEV_CHANGEMTU:
d31c7b8f 2800 if (idev && dev->mtu >= IPV6_MIN_MTU) {
1da177e4
LT		 2801 rt6_mtu_change(dev, dev->mtu);
2802 idev->cnf.mtu6 = dev->mtu;
2803 break;
2804 }
2805
d31c7b8f
EP		 2806 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2807 idev = ipv6_add_dev(dev);
2808 if (idev)
2809 break;
2810 }
2811
bcdd553f
SH		 2812 /*
2813 * MTU falled under IPV6_MIN_MTU.
2814 * Stop IPv6 on this interface.
2815 */
1da177e4
LT		 2816
2817 case NETDEV_DOWN:
2818 case NETDEV_UNREGISTER:
2819 /*
2820 * Remove all addresses from this interface.
2821 */
2822 addrconf_ifdown(dev, event != NETDEV_DOWN);
2823 break;
3c21edbd 2824
1da177e4 2825 case NETDEV_CHANGENAME:
1da177e4 2826 if (idev) {
5632c515 2827 snmp6_unregister_dev(idev);
408c4768 2828 addrconf_sysctl_unregister(idev);
f52295a9 2829 addrconf_sysctl_register(idev);
b217d616
HX		 2830 err = snmp6_register_dev(idev);
2831 if (err)
2832 return notifier_from_errno(err);
5632c515 2833 }
1da177e4 2834 break;
bcdd553f 2835
93d9b7d7
JP		 2836 case NETDEV_PRE_TYPE_CHANGE:
2837 case NETDEV_POST_TYPE_CHANGE:
2838 addrconf_type_change(dev, event);
75c78500 2839 break;
3ff50b79 2840 }
1da177e4
LT		 2841
2842 return NOTIFY_OK;
2843}
2844
2845/*
2846 * addrconf module should be notified of a device going up
2847 */
2848static struct notifier_block ipv6_dev_notf = {
2849 .notifier_call = addrconf_notify,
1da177e4
LT		 2850};
2851
93d9b7d7 2852static void addrconf_type_change(struct net_device *dev, unsigned long event)
75c78500
MS		 2853{
2854 struct inet6_dev *idev;
2855 ASSERT_RTNL();
2856
2857 idev = __in6_dev_get(dev);
2858
93d9b7d7 2859 if (event == NETDEV_POST_TYPE_CHANGE)
75c78500 2860 ipv6_mc_remap(idev);
93d9b7d7 2861 else if (event == NETDEV_PRE_TYPE_CHANGE)
75c78500
MS		 2862 ipv6_mc_unmap(idev);
2863}
2864
1da177e4
LT		 2865static int addrconf_ifdown(struct net_device *dev, int how)
2866{
c346dca1 2867 struct net *net = dev_net(dev);
502a2ffd 2868 struct inet6_dev *idev;
2869 struct inet6_ifaddr *ifa;
73a8bd74 2870 int state, i;
1da177e4
LT		 2871
2872 ASSERT_RTNL();
2873
73a8bd74
DM		 2874 rt6_ifdown(net, dev);
2875 neigh_ifdown(&nd_tbl, dev);
1da177e4
LT		 2876
2877 idev = __in6_dev_get(dev);
2878 if (idev == NULL)
2879 return -ENODEV;
2880
bcdd553f
SH		 2881 /*
2882 * Step 1: remove reference to ipv6 device from parent device.
2883 * Do not dev_put!
1da177e4 2884 */
439e2385 2885 if (how) {
1da177e4 2886 idev->dead = 1;
8814c4b5
YH		 2887
2888 /* protected by rtnl_lock */
a9b3cd7f 2889 RCU_INIT_POINTER(dev->ip6_ptr, NULL);
1da177e4
LT		 2890
2891 /* Step 1.5: remove snmp6 entry */
2892 snmp6_unregister_dev(idev);
2893
2894 }
2895
73a8bd74
DM		 2896 /* Step 2: clear hash table */
2897 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
2898 struct hlist_head *h = &inet6_addr_lst[i];
2899 struct hlist_node *n;
2900
2901 spin_lock_bh(&addrconf_hash_lock);
2902 restart:
2903 hlist_for_each_entry_rcu(ifa, n, h, addr_lst) {
2904 if (ifa->idev == idev) {
2905 hlist_del_init_rcu(&ifa->addr_lst);
2906 addrconf_del_timer(ifa);
2907 goto restart;
2908 }
2909 }
2910 spin_unlock_bh(&addrconf_hash_lock);
2911 }
2912
1da177e4
LT		 2913 write_lock_bh(&idev->lock);
2914
bcdd553f 2915 /* Step 2: clear flags for stateless addrconf */
439e2385 2916 if (!how)
3c21edbd 2917 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
1da177e4 2918
1da177e4 2919#ifdef CONFIG_IPV6_PRIVACY
439e2385 2920 if (how && del_timer(&idev->regen_timer))
1da177e4
LT		 2921 in6_dev_put(idev);
2922
bcdd553f 2923 /* Step 3: clear tempaddr list */
372e6c8f 2924 while (!list_empty(&idev->tempaddr_list)) {
2925 ifa = list_first_entry(&idev->tempaddr_list,
2926 struct inet6_ifaddr, tmp_list);
2927 list_del(&ifa->tmp_list);
1da177e4
LT		 2928 write_unlock_bh(&idev->lock);
2929 spin_lock_bh(&ifa->lock);
2930
2931 if (ifa->ifpub) {
2932 in6_ifa_put(ifa->ifpub);
2933 ifa->ifpub = NULL;
2934 }
2935 spin_unlock_bh(&ifa->lock);
2936 in6_ifa_put(ifa);
2937 write_lock_bh(&idev->lock);
2938 }
2939#endif
8f37ada5 2940
502a2ffd 2941 while (!list_empty(&idev->addr_list)) {
2942 ifa = list_first_entry(&idev->addr_list,
2943 struct inet6_ifaddr, if_list);
84e8b803 2944 addrconf_del_timer(ifa);
2945
73a8bd74 2946 list_del(&ifa->if_list);
84e8b803 2947
73a8bd74 2948 write_unlock_bh(&idev->lock);
84e8b803 2949
73a8bd74
DM		 2950 spin_lock_bh(&ifa->state_lock);
2951 state = ifa->state;
2952 ifa->state = INET6_IFADDR_STATE_DEAD;
2953 spin_unlock_bh(&ifa->state_lock);
9d82ca98 2954
73a8bd74
DM		 2955 if (state != INET6_IFADDR_STATE_DEAD) {
2956 __ipv6_ifa_notify(RTM_DELADDR, ifa);
2957 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifa);
27bdb2ab 2958 }
73a8bd74 2959 in6_ifa_put(ifa);
8f37ada5 2960
73a8bd74
DM		 2961 write_lock_bh(&idev->lock);
2962 }
8f37ada5 2963
1da177e4
LT		 2964 write_unlock_bh(&idev->lock);
2965
2966 /* Step 5: Discard multicast list */
439e2385 2967 if (how)
1da177e4
LT		 2968 ipv6_mc_destroy_dev(idev);
2969 else
2970 ipv6_mc_down(idev);
2971
1da177e4 2972 idev->tstamp = jiffies;
1ab1457c 2973
bcdd553f 2974 /* Last: Shot the device (if unregistered) */
439e2385 2975 if (how) {
408c4768 2976 addrconf_sysctl_unregister(idev);
1da177e4
LT		 2977 neigh_parms_release(&nd_tbl, idev->nd_parms);
2978 neigh_ifdown(&nd_tbl, dev);
2979 in6_dev_put(idev);
2980 }
2981 return 0;
2982}
2983
2984static void addrconf_rs_timer(unsigned long data)
2985{
2986 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
5b2a1953 2987 struct inet6_dev *idev = ifp->idev;
1da177e4 2988
5b2a1953 2989 read_lock(&idev->lock);
2990 if (idev->dead || !(idev->if_flags & IF_READY))
1da177e4
LT		 2991 goto out;
2992
9ba2add3 2993 if (!ipv6_accept_ra(idev))
5b2a1953 2994 goto out;
2995
2996 /* Announcement received after solicitation was sent */
2997 if (idev->if_flags & IF_RA_RCVD)
1da177e4 2998 goto out;
1da177e4
LT		 2999
3000 spin_lock(&ifp->lock);
5b2a1953 3001 if (ifp->probes++ < idev->cnf.rtr_solicits) {
1da177e4
LT		 3002 /* The wait after the last probe can be shorter */
3003 addrconf_mod_timer(ifp, AC_RS,
5b2a1953 3004 (ifp->probes == idev->cnf.rtr_solicits) ?
3005 idev->cnf.rtr_solicit_delay :
3006 idev->cnf.rtr_solicit_interval);
1da177e4
LT		 3007 spin_unlock(&ifp->lock);
3008
5b2a1953 3009 ndisc_send_rs(idev->dev, &ifp->addr, &in6addr_linklocal_allrouters);
1da177e4
LT		 3010 } else {
3011 spin_unlock(&ifp->lock);
3012 /*
3013 * Note: we do not support deprecated "all on-link"
3014 * assumption any longer.
3015 */
91df42be 3016 pr_debug("%s: no IPv6 routers present\n", idev->dev->name);
1da177e4
LT		 3017 }
3018
3019out:
5b2a1953 3020 read_unlock(&idev->lock);
1da177e4
LT		 3021 in6_ifa_put(ifp);
3022}
3023
3024/*
3025 * Duplicate Address Detection
3026 */
3c21edbd
YH		 3027static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
3028{
3029 unsigned long rand_num;
3030 struct inet6_dev *idev = ifp->idev;
3031
95c385b4
NH		 3032 if (ifp->flags & IFA_F_OPTIMISTIC)
3033 rand_num = 0;
3034 else
3035 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1);
3036
3c21edbd
YH		 3037 ifp->probes = idev->cnf.dad_transmits;
3038 addrconf_mod_timer(ifp, AC_DAD, rand_num);
3039}
3040
cf22f9a2 3041static void addrconf_dad_start(struct inet6_ifaddr *ifp)
1da177e4
LT		 3042{
3043 struct inet6_dev *idev = ifp->idev;
3044 struct net_device *dev = idev->dev;
1da177e4
LT		 3045
3046 addrconf_join_solict(dev, &ifp->addr);
3047
1da177e4 3048 net_srandom(ifp->addr.s6_addr32[3]);
1da177e4
LT		 3049
3050 read_lock_bh(&idev->lock);
622ccdf1 3051 spin_lock(&ifp->lock);
e9d3e084 3052 if (ifp->state == INET6_IFADDR_STATE_DEAD)
1da177e4 3053 goto out;
1da177e4
LT		 3054
3055 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
1b34be74 3056 idev->cnf.accept_dad < 1 ||
55ebaef1
NT		 3057 !(ifp->flags&IFA_F_TENTATIVE) ||
3058 ifp->flags & IFA_F_NODAD) {
cc411d0b 3059 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
21809faf 3060 spin_unlock(&ifp->lock);
1da177e4
LT		 3061 read_unlock_bh(&idev->lock);
3062
3063 addrconf_dad_completed(ifp);
3064 return;
3065 }
3066
6732bade 3067 if (!(idev->if_flags & IF_READY)) {
21809faf 3068 spin_unlock(&ifp->lock);
6732bade 3069 read_unlock_bh(&idev->lock);
3c21edbd 3070 /*
590a9887 3071 * If the device is not ready:
3c21edbd
YH		 3072 * - keep it tentative if it is a permanent address.
3073 * - otherwise, kill it.
3074 */
3075 in6_ifa_hold(ifp);
cc411d0b 3076 addrconf_dad_stop(ifp, 0);
6732bade 3077 return;
3c21edbd 3078 }
95c385b4
NH		 3079
3080 /*
3081 * Optimistic nodes can start receiving
3082 * Frames right away
3083 */
e21e8467 3084 if (ifp->flags & IFA_F_OPTIMISTIC)
95c385b4
NH		 3085 ip6_ins_rt(ifp->rt);
3086
6732bade 3087 addrconf_dad_kick(ifp);
1da177e4 3088out:
622ccdf1 3089 spin_unlock(&ifp->lock);
1da177e4
LT		 3090 read_unlock_bh(&idev->lock);
3091}
3092
3093static void addrconf_dad_timer(unsigned long data)
3094{
3095 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
3096 struct inet6_dev *idev = ifp->idev;
1da177e4
LT		 3097 struct in6_addr mcaddr;
3098
f2344a13
HX		 3099 if (!ifp->probes && addrconf_dad_end(ifp))
3100 goto out;
3101
122e4519 3102 read_lock(&idev->lock);
3103 if (idev->dead || !(idev->if_flags & IF_READY)) {
3104 read_unlock(&idev->lock);
1da177e4
LT		 3105 goto out;
3106 }
21809faf 3107
3108 spin_lock(&ifp->lock);
622ccdf1
HX		 3109 if (ifp->state == INET6_IFADDR_STATE_DEAD) {
3110 spin_unlock(&ifp->lock);
3111 read_unlock(&idev->lock);
3112 goto out;
3113 }
3114
1da177e4
LT		 3115 if (ifp->probes == 0) {
3116 /*
3117 * DAD was successful
3118 */
3119
cc411d0b 3120 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
21809faf 3121 spin_unlock(&ifp->lock);
122e4519 3122 read_unlock(&idev->lock);
1da177e4
LT		 3123
3124 addrconf_dad_completed(ifp);
3125
3126 goto out;
3127 }
3128
3129 ifp->probes--;
3130 addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time);
21809faf 3131 spin_unlock(&ifp->lock);
122e4519 3132 read_unlock(&idev->lock);
1da177e4
LT		 3133
3134 /* send a neighbour solicitation for our addr */
1da177e4 3135 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
d7aabf22 3136 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &in6addr_any);
1da177e4
LT		 3137out:
3138 in6_ifa_put(ifp);
3139}
3140
3141static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
3142{
e21e8467 3143 struct net_device *dev = ifp->idev->dev;
1da177e4
LT		 3144
3145 /*
3146 * Configure the address for reception. Now it is valid.
3147 */
3148
3149 ipv6_ifa_notify(RTM_NEWADDR, ifp);
3150
026359bc
TA		 3151 /* If added prefix is link local and we are prepared to process
3152 router advertisements, start sending router solicitations.
1da177e4
LT		 3153 */
3154
aeaf6e9d 3155 if (ipv6_accept_ra(ifp->idev) &&
1da177e4
LT		 3156 ifp->idev->cnf.rtr_solicits > 0 &&
3157 (dev->flags&IFF_LOOPBACK) == 0 &&
3158 (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) {
1da177e4
LT		 3159 /*
3160 * If a host as already performed a random delay
3161 * [...] as part of DAD [...] there is no need
3162 * to delay again before sending the first RS
3163 */
f3ee4010 3164 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &in6addr_linklocal_allrouters);
1da177e4
LT		 3165
3166 spin_lock_bh(&ifp->lock);
3167 ifp->probes = 1;
3168 ifp->idev->if_flags |= IF_RS_SENT;
3169 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval);
3170 spin_unlock_bh(&ifp->lock);
3171 }
3172}
3173
e21e8467
SH		 3174static void addrconf_dad_run(struct inet6_dev *idev)
3175{
c5e33bdd
YH		 3176 struct inet6_ifaddr *ifp;
3177
3178 read_lock_bh(&idev->lock);
502a2ffd 3179 list_for_each_entry(ifp, &idev->addr_list, if_list) {
21809faf 3180 spin_lock(&ifp->lock);
f2344a13
HX		 3181 if (ifp->flags & IFA_F_TENTATIVE &&
3182 ifp->state == INET6_IFADDR_STATE_DAD)
3183 addrconf_dad_kick(ifp);
21809faf 3184 spin_unlock(&ifp->lock);
c5e33bdd
YH		 3185 }
3186 read_unlock_bh(&idev->lock);
3187}
3188
1da177e4
LT		 3189#ifdef CONFIG_PROC_FS
3190struct if6_iter_state {
3c40090a 3191 struct seq_net_private p;
1da177e4 3192 int bucket;
1d578303 3193 int offset;
1da177e4
LT		 3194};
3195
1d578303 3196static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos)
1da177e4
LT		 3197{
3198 struct inet6_ifaddr *ifa = NULL;
3199 struct if6_iter_state *state = seq->private;
1218854a 3200 struct net *net = seq_file_net(seq);
1d578303 3201 int p = 0;
1da177e4 3202
1d578303
MM		 3203 /* initial bucket if pos is 0 */
3204 if (pos == 0) {
3205 state->bucket = 0;
3206 state->offset = 0;
3207 }
3208
3209 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
c2e21293 3210 struct hlist_node *n;
4f70ecca 3211 hlist_for_each_entry_rcu_bh(ifa, n, &inet6_addr_lst[state->bucket],
1d578303 3212 addr_lst) {
9f0d3c27
ED		 3213 if (!net_eq(dev_net(ifa->idev->dev), net))
3214 continue;
1d578303
MM		 3215 /* sync with offset */
3216 if (p < state->offset) {
3217 p++;
3218 continue;
3219 }
3220 state->offset++;
9f0d3c27 3221 return ifa;
1d578303
MM		 3222 }
3223
3224 /* prepare for next bucket */
3225 state->offset = 0;
3226 p = 0;
1da177e4 3227 }
c2e21293 3228 return NULL;
1da177e4
LT		 3229}
3230
c2e21293 3231static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
3232 struct inet6_ifaddr *ifa)
1da177e4
LT		 3233{
3234 struct if6_iter_state *state = seq->private;
1218854a 3235 struct net *net = seq_file_net(seq);
c2e21293 3236 struct hlist_node *n = &ifa->addr_lst;
1da177e4 3237
1d578303 3238 hlist_for_each_entry_continue_rcu_bh(ifa, n, addr_lst) {
9f0d3c27
ED		 3239 if (!net_eq(dev_net(ifa->idev->dev), net))
3240 continue;
1d578303 3241 state->offset++;
9f0d3c27 3242 return ifa;
1d578303 3243 }
3c40090a 3244
c2e21293 3245 while (++state->bucket < IN6_ADDR_HSIZE) {
1d578303 3246 state->offset = 0;
4f70ecca 3247 hlist_for_each_entry_rcu_bh(ifa, n,
c2e21293 3248 &inet6_addr_lst[state->bucket], addr_lst) {
9f0d3c27
ED		 3249 if (!net_eq(dev_net(ifa->idev->dev), net))
3250 continue;
1d578303 3251 state->offset++;
9f0d3c27 3252 return ifa;
c2e21293 3253 }
1da177e4 3254 }
3c40090a 3255
c2e21293 3256 return NULL;
1da177e4
LT		 3257}
3258
1da177e4 3259static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
4f70ecca 3260 __acquires(rcu_bh)
1da177e4 3261{
5c578aed 3262 rcu_read_lock_bh();
1d578303 3263 return if6_get_first(seq, *pos);
1da177e4
LT		 3264}
3265
3266static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3267{
3268 struct inet6_ifaddr *ifa;
3269
3270 ifa = if6_get_next(seq, v);
3271 ++*pos;
3272 return ifa;
3273}
3274
3275static void if6_seq_stop(struct seq_file *seq, void *v)
4f70ecca 3276 __releases(rcu_bh)
1da177e4 3277{
5c578aed 3278 rcu_read_unlock_bh();
1da177e4
LT		 3279}
3280
3281static int if6_seq_show(struct seq_file *seq, void *v)
3282{
3283 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
4b7a4274 3284 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
b071195d 3285 &ifp->addr,
1da177e4
LT		 3286 ifp->idev->dev->ifindex,
3287 ifp->prefix_len,
3288 ifp->scope,
3289 ifp->flags,
3290 ifp->idev->dev->name);
3291 return 0;
3292}
3293
56b3d975 3294static const struct seq_operations if6_seq_ops = {
1da177e4
LT		 3295 .start = if6_seq_start,
3296 .next = if6_seq_next,
3297 .show = if6_seq_show,
3298 .stop = if6_seq_stop,
3299};
3300
3301static int if6_seq_open(struct inode *inode, struct file *file)
3302{
3c40090a
DL		 3303 return seq_open_net(inode, file, &if6_seq_ops,
3304 sizeof(struct if6_iter_state));
1da177e4
LT		 3305}
3306
9a32144e 3307static const struct file_operations if6_fops = {
1da177e4
LT		 3308 .owner = THIS_MODULE,
3309 .open = if6_seq_open,
3310 .read = seq_read,
3311 .llseek = seq_lseek,
3c40090a 3312 .release = seq_release_net,
1da177e4
LT		 3313};
3314
2c8c1e72 3315static int __net_init if6_proc_net_init(struct net *net)
1da177e4 3316{
3c40090a 3317 if (!proc_net_fops_create(net, "if_inet6", S_IRUGO, &if6_fops))
1da177e4
LT		 3318 return -ENOMEM;
3319 return 0;
3320}
3321
2c8c1e72 3322static void __net_exit if6_proc_net_exit(struct net *net)
3c40090a
DL		 3323{
3324 proc_net_remove(net, "if_inet6");
3325}
3326
3327static struct pernet_operations if6_proc_net_ops = {
3328 .init = if6_proc_net_init,
3329 .exit = if6_proc_net_exit,
3330};
3331
3332int __init if6_proc_init(void)
3333{
3334 return register_pernet_subsys(&if6_proc_net_ops);
3335}
3336
1da177e4
LT		 3337void if6_proc_exit(void)
3338{
3c40090a 3339 unregister_pernet_subsys(&if6_proc_net_ops);
1da177e4
LT		 3340}
3341#endif /* CONFIG_PROC_FS */
3342
07a93626 3343#if IS_ENABLED(CONFIG_IPV6_MIP6)
3b9f9a1c 3344/* Check if address is a home address configured on any interface. */
b71d1d42 3345int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr)
3b9f9a1c
NT		 3346{
3347 int ret = 0;
c2e21293 3348 struct inet6_ifaddr *ifp = NULL;
3349 struct hlist_node *n;
ddbe5032 3350 unsigned int hash = inet6_addr_hash(addr);
c2e21293 3351
5c578aed 3352 rcu_read_lock_bh();
4f70ecca 3353 hlist_for_each_entry_rcu_bh(ifp, n, &inet6_addr_lst[hash], addr_lst) {
878628fb 3354 if (!net_eq(dev_net(ifp->idev->dev), net))
389f6612 3355 continue;
caad295f 3356 if (ipv6_addr_equal(&ifp->addr, addr) &&
3b9f9a1c
NT		 3357 (ifp->flags & IFA_F_HOMEADDRESS)) {
3358 ret = 1;
3359 break;
3360 }
3361 }
5c578aed 3362 rcu_read_unlock_bh();
3b9f9a1c
NT		 3363 return ret;
3364}
3365#endif
3366
1da177e4
LT		 3367/*
3368 * Periodic address status verification
3369 */
3370
3371static void addrconf_verify(unsigned long foo)
3372{
b2db7564 3373 unsigned long now, next, next_sec, next_sched;
1da177e4 3374 struct inet6_ifaddr *ifp;
c2e21293 3375 struct hlist_node *node;
1da177e4
LT		 3376 int i;
3377
5c578aed 3378 rcu_read_lock_bh();
3379 spin_lock(&addrconf_verify_lock);
1da177e4 3380 now = jiffies;
b2db7564 3381 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
1da177e4
LT		 3382
3383 del_timer(&addr_chk_timer);
3384
bcdd553f 3385 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
1da177e4 3386restart:
4f70ecca 3387 hlist_for_each_entry_rcu_bh(ifp, node,
5c578aed 3388 &inet6_addr_lst[i], addr_lst) {
1da177e4 3389 unsigned long age;
1da177e4
LT		 3390
3391 if (ifp->flags & IFA_F_PERMANENT)
3392 continue;
3393
3394 spin_lock(&ifp->lock);
b2db7564
YH		 3395 /* We try to batch several events at once. */
3396 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
1da177e4 3397
8f27ebb9
YH		 3398 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
3399 age >= ifp->valid_lft) {
1da177e4
LT		 3400 spin_unlock(&ifp->lock);
3401 in6_ifa_hold(ifp);
1da177e4
LT		 3402 ipv6_del_addr(ifp);
3403 goto restart;
8f27ebb9
YH		 3404 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
3405 spin_unlock(&ifp->lock);
3406 continue;
1da177e4 3407 } else if (age >= ifp->prefered_lft) {
a1ed0526 3408 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
1da177e4
LT		 3409 int deprecate = 0;
3410
3411 if (!(ifp->flags&IFA_F_DEPRECATED)) {
3412 deprecate = 1;
3413 ifp->flags |= IFA_F_DEPRECATED;
3414 }
3415
3416 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))
3417 next = ifp->tstamp + ifp->valid_lft * HZ;
3418
3419 spin_unlock(&ifp->lock);
3420
3421 if (deprecate) {
3422 in6_ifa_hold(ifp);
1da177e4
LT		 3423
3424 ipv6_ifa_notify(0, ifp);
3425 in6_ifa_put(ifp);
3426 goto restart;
3427 }
3428#ifdef CONFIG_IPV6_PRIVACY
3429 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
3430 !(ifp->flags&IFA_F_TENTATIVE)) {
88949cf4 3431 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
3432 ifp->idev->cnf.dad_transmits *
3433 ifp->idev->nd_parms->retrans_time / HZ;
3434
1da177e4
LT		 3435 if (age >= ifp->prefered_lft - regen_advance) {
3436 struct inet6_ifaddr *ifpub = ifp->ifpub;
3437 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3438 next = ifp->tstamp + ifp->prefered_lft * HZ;
3439 if (!ifp->regen_count && ifpub) {
3440 ifp->regen_count++;
3441 in6_ifa_hold(ifp);
3442 in6_ifa_hold(ifpub);
3443 spin_unlock(&ifp->lock);
5c578aed 3444
291d809b
HY		 3445 spin_lock(&ifpub->lock);
3446 ifpub->regen_count = 0;
3447 spin_unlock(&ifpub->lock);
1da177e4
LT		 3448 ipv6_create_tempaddr(ifpub, ifp);
3449 in6_ifa_put(ifpub);
3450 in6_ifa_put(ifp);
3451 goto restart;
3452 }
3453 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
3454 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
3455 spin_unlock(&ifp->lock);
3456#endif
3457 } else {
3458 /* ifp->prefered_lft <= ifp->valid_lft */
3459 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3460 next = ifp->tstamp + ifp->prefered_lft * HZ;
3461 spin_unlock(&ifp->lock);
3462 }
3463 }
1da177e4
LT		 3464 }
3465
b2db7564
YH		 3466 next_sec = round_jiffies_up(next);
3467 next_sched = next;
3468
3469 /* If rounded timeout is accurate enough, accept it. */
3470 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
3471 next_sched = next_sec;
3472
3473 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
3474 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
3475 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
3476
3477 ADBG((KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
3478 now, next, next_sec, next_sched));
3479
3480 addr_chk_timer.expires = next_sched;
1da177e4 3481 add_timer(&addr_chk_timer);
5c578aed 3482 spin_unlock(&addrconf_verify_lock);
3483 rcu_read_unlock_bh();
1da177e4
LT		 3484}
3485
461d8837
TG		 3486static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local)
3487{
3488 struct in6_addr *pfx = NULL;
3489
3490 if (addr)
3491 pfx = nla_data(addr);
3492
3493 if (local) {
3494 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
3495 pfx = NULL;
3496 else
3497 pfx = nla_data(local);
3498 }
3499
3500 return pfx;
3501}
3502
ef7c79ed 3503static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
461d8837
TG		 3504 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
3505 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
3506 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
3507};
3508
1da177e4
LT		 3509static int
3510inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3511{
3b1e0a65 3512 struct net *net = sock_net(skb->sk);
b933f716
TG		 3513 struct ifaddrmsg *ifm;
3514 struct nlattr *tb[IFA_MAX+1];
1da177e4 3515 struct in6_addr *pfx;
b933f716 3516 int err;
1da177e4 3517
b933f716
TG		 3518 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3519 if (err < 0)
3520 return err;
3521
3522 ifm = nlmsg_data(nlh);
3523 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
1da177e4
LT		 3524 if (pfx == NULL)
3525 return -EINVAL;
3526
af284937 3527 return inet6_addr_del(net, ifm->ifa_index, pfx, ifm->ifa_prefixlen);
1da177e4
LT		 3528}
3529
55ebaef1
NT		 3530static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags,
3531 u32 prefered_lft, u32 valid_lft)
081bba5b 3532{
6f704992
YH		 3533 u32 flags;
3534 clock_t expires;
4bed72e4 3535 unsigned long timeout;
46d48046 3536
081bba5b
NT		 3537 if (!valid_lft || (prefered_lft > valid_lft))
3538 return -EINVAL;
3539
4bed72e4
YH		 3540 timeout = addrconf_timeout_fixup(valid_lft, HZ);
3541 if (addrconf_finite_timeout(timeout)) {
3542 expires = jiffies_to_clock_t(timeout * HZ);
3543 valid_lft = timeout;
6f704992 3544 flags = RTF_EXPIRES;
4bed72e4
YH		 3545 } else {
3546 expires = 0;
3547 flags = 0;
3548 ifa_flags |= IFA_F_PERMANENT;
6f704992 3549 }
081bba5b 3550
4bed72e4
YH		 3551 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
3552 if (addrconf_finite_timeout(timeout)) {
3553 if (timeout == 0)
3554 ifa_flags |= IFA_F_DEPRECATED;
3555 prefered_lft = timeout;
3556 }
081bba5b
NT		 3557
3558 spin_lock_bh(&ifp->lock);
3b9f9a1c 3559 ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags;
081bba5b
NT		 3560 ifp->tstamp = jiffies;
3561 ifp->valid_lft = valid_lft;
3562 ifp->prefered_lft = prefered_lft;
3563
3564 spin_unlock_bh(&ifp->lock);
3565 if (!(ifp->flags&IFA_F_TENTATIVE))
3566 ipv6_ifa_notify(0, ifp);
081bba5b 3567
46d48046 3568 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
6f704992 3569 expires, flags);
081bba5b
NT		 3570 addrconf_verify(0);
3571
3572 return 0;
3573}
3574
1da177e4
LT		 3575static int
3576inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3577{
3b1e0a65 3578 struct net *net = sock_net(skb->sk);
461d8837
TG		 3579 struct ifaddrmsg *ifm;
3580 struct nlattr *tb[IFA_MAX+1];
1da177e4 3581 struct in6_addr *pfx;
7198f8ce
TG		 3582 struct inet6_ifaddr *ifa;
3583 struct net_device *dev;
55ebaef1
NT		 3584 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
3585 u8 ifa_flags;
461d8837 3586 int err;
1da177e4 3587
461d8837
TG		 3588 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3589 if (err < 0)
3590 return err;
3591
3592 ifm = nlmsg_data(nlh);
3593 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
1da177e4
LT		 3594 if (pfx == NULL)
3595 return -EINVAL;
3596
461d8837 3597 if (tb[IFA_CACHEINFO]) {
0778769d 3598 struct ifa_cacheinfo *ci;
461d8837
TG		 3599
3600 ci = nla_data(tb[IFA_CACHEINFO]);
0778769d 3601 valid_lft = ci->ifa_valid;
461d8837
TG		 3602 preferred_lft = ci->ifa_prefered;
3603 } else {
3604 preferred_lft = INFINITY_LIFE_TIME;
3605 valid_lft = INFINITY_LIFE_TIME;
0778769d
NT		 3606 }
3607
af284937 3608 dev = __dev_get_by_index(net, ifm->ifa_index);
7198f8ce
TG		 3609 if (dev == NULL)
3610 return -ENODEV;
3611
55ebaef1 3612 /* We ignore other flags so far. */
3b9f9a1c 3613 ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS);
55ebaef1 3614
1cab3da6 3615 ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
7198f8ce
TG		 3616 if (ifa == NULL) {
3617 /*
3618 * It would be best to check for !NLM_F_CREATE here but
3619 * userspace alreay relies on not having to provide this.
3620 */
af284937
DL		 3621 return inet6_addr_add(net, ifm->ifa_index, pfx,
3622 ifm->ifa_prefixlen, ifa_flags,
3623 preferred_lft, valid_lft);
081bba5b
NT		 3624 }
3625
7198f8ce
TG		 3626 if (nlh->nlmsg_flags & NLM_F_EXCL ||
3627 !(nlh->nlmsg_flags & NLM_F_REPLACE))
3628 err = -EEXIST;
3629 else
55ebaef1 3630 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
7198f8ce
TG		 3631
3632 in6_ifa_put(ifa);
3633
3634 return err;
1da177e4
LT		 3635}
3636
101bb229
TG		 3637static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags,
3638 u8 scope, int ifindex)
3639{
3640 struct ifaddrmsg *ifm;
3641
3642 ifm = nlmsg_data(nlh);
3643 ifm->ifa_family = AF_INET6;
3644 ifm->ifa_prefixlen = prefixlen;
3645 ifm->ifa_flags = flags;
3646 ifm->ifa_scope = scope;
3647 ifm->ifa_index = ifindex;
3648}
3649
85486af0
TG		 3650static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
3651 unsigned long tstamp, u32 preferred, u32 valid)
3652{
3653 struct ifa_cacheinfo ci;
3654
18a31e1e
TG		 3655 ci.cstamp = cstamp_delta(cstamp);
3656 ci.tstamp = cstamp_delta(tstamp);
85486af0
TG		 3657 ci.ifa_prefered = preferred;
3658 ci.ifa_valid = valid;
3659
3660 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
3661}
3662
101bb229
TG		 3663static inline int rt_scope(int ifa_scope)
3664{
3665 if (ifa_scope & IFA_HOST)
3666 return RT_SCOPE_HOST;
3667 else if (ifa_scope & IFA_LINK)
3668 return RT_SCOPE_LINK;
3669 else if (ifa_scope & IFA_SITE)
3670 return RT_SCOPE_SITE;
3671 else
3672 return RT_SCOPE_UNIVERSE;
3673}
3674
0ab6803b
TG		 3675static inline int inet6_ifaddr_msgsize(void)
3676{
339bf98f
TG		 3677 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
3678 + nla_total_size(16) /* IFA_ADDRESS */
3679 + nla_total_size(sizeof(struct ifa_cacheinfo));
0ab6803b 3680}
c5396a31 3681
1da177e4 3682static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
15e47304 3683 u32 portid, u32 seq, int event, unsigned int flags)
1da177e4 3684{
1da177e4 3685 struct nlmsghdr *nlh;
85486af0 3686 u32 preferred, valid;
1da177e4 3687
15e47304 3688 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
0ab6803b 3689 if (nlh == NULL)
26932566 3690 return -EMSGSIZE;
0ab6803b 3691
101bb229
TG		 3692 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
3693 ifa->idev->dev->ifindex);
3694
1da177e4 3695 if (!(ifa->flags&IFA_F_PERMANENT)) {
85486af0
TG		 3696 preferred = ifa->prefered_lft;
3697 valid = ifa->valid_lft;
3698 if (preferred != INFINITY_LIFE_TIME) {
1da177e4 3699 long tval = (jiffies - ifa->tstamp)/HZ;
a1faa698
JR		 3700 if (preferred > tval)
3701 preferred -= tval;
3702 else
3703 preferred = 0;
f56619fc
BH		 3704 if (valid != INFINITY_LIFE_TIME) {
3705 if (valid > tval)
3706 valid -= tval;
3707 else
3708 valid = 0;
3709 }
1da177e4
LT		 3710 }
3711 } else {
85486af0
TG		 3712 preferred = INFINITY_LIFE_TIME;
3713 valid = INFINITY_LIFE_TIME;
3714 }
3715
0ab6803b 3716 if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0 ||
26932566
PM		 3717 put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) {
3718 nlmsg_cancel(skb, nlh);
3719 return -EMSGSIZE;
3720 }
1da177e4 3721
0ab6803b 3722 return nlmsg_end(skb, nlh);
1da177e4
LT		 3723}
3724
3725static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
15e47304 3726 u32 portid, u32 seq, int event, u16 flags)
1da177e4 3727{
1da177e4 3728 struct nlmsghdr *nlh;
101bb229
TG		 3729 u8 scope = RT_SCOPE_UNIVERSE;
3730 int ifindex = ifmca->idev->dev->ifindex;
3731
3732 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
3733 scope = RT_SCOPE_SITE;
1da177e4 3734
15e47304 3735 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
0ab6803b 3736 if (nlh == NULL)
26932566 3737 return -EMSGSIZE;
85486af0 3738
0ab6803b
TG		 3739 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3740 if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 ||
3741 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
26932566
PM		 3742 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3743 nlmsg_cancel(skb, nlh);
3744 return -EMSGSIZE;
3745 }
85486af0 3746
0ab6803b 3747 return nlmsg_end(skb, nlh);
1da177e4
LT		 3748}
3749
3750static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
15e47304 3751 u32 portid, u32 seq, int event, unsigned int flags)
1da177e4 3752{
1da177e4 3753 struct nlmsghdr *nlh;
101bb229
TG		 3754 u8 scope = RT_SCOPE_UNIVERSE;
3755 int ifindex = ifaca->aca_idev->dev->ifindex;
3756
3757 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
3758 scope = RT_SCOPE_SITE;
1da177e4 3759
15e47304 3760 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
0ab6803b 3761 if (nlh == NULL)
26932566 3762 return -EMSGSIZE;
85486af0 3763
0ab6803b
TG		 3764 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3765 if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 ||
3766 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
26932566
PM		 3767 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3768 nlmsg_cancel(skb, nlh);
3769 return -EMSGSIZE;
3770 }
1da177e4 3771
0ab6803b 3772 return nlmsg_end(skb, nlh);
1da177e4
LT		 3773}
3774
e21e8467 3775enum addr_type_t {
1da177e4
LT		 3776 UNICAST_ADDR,
3777 MULTICAST_ADDR,
3778 ANYCAST_ADDR,
3779};
3780
234b27c3
ED		 3781/* called with rcu_read_lock() */
3782static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
3783 struct netlink_callback *cb, enum addr_type_t type,
3784 int s_ip_idx, int *p_ip_idx)
3785{
234b27c3
ED		 3786 struct ifmcaddr6 *ifmca;
3787 struct ifacaddr6 *ifaca;
3788 int err = 1;
3789 int ip_idx = *p_ip_idx;
3790
3791 read_lock_bh(&idev->lock);
3792 switch (type) {
502a2ffd 3793 case UNICAST_ADDR: {
3794 struct inet6_ifaddr *ifa;
3795
234b27c3 3796 /* unicast address incl. temp addr */
502a2ffd 3797 list_for_each_entry(ifa, &idev->addr_list, if_list) {
3798 if (++ip_idx < s_ip_idx)
234b27c3
ED		 3799 continue;
3800 err = inet6_fill_ifaddr(skb, ifa,
15e47304 3801 NETLINK_CB(cb->skb).portid,
234b27c3
ED		 3802 cb->nlh->nlmsg_seq,
3803 RTM_NEWADDR,
3804 NLM_F_MULTI);
3805 if (err <= 0)
3806 break;
3807 }
3808 break;
502a2ffd 3809 }
234b27c3
ED		 3810 case MULTICAST_ADDR:
3811 /* multicast address */
3812 for (ifmca = idev->mc_list; ifmca;
3813 ifmca = ifmca->next, ip_idx++) {
3814 if (ip_idx < s_ip_idx)
3815 continue;
3816 err = inet6_fill_ifmcaddr(skb, ifmca,
15e47304 3817 NETLINK_CB(cb->skb).portid,
234b27c3
ED		 3818 cb->nlh->nlmsg_seq,
3819 RTM_GETMULTICAST,
3820 NLM_F_MULTI);
3821 if (err <= 0)
3822 break;
3823 }
3824 break;
3825 case ANYCAST_ADDR:
3826 /* anycast address */
3827 for (ifaca = idev->ac_list; ifaca;
3828 ifaca = ifaca->aca_next, ip_idx++) {
3829 if (ip_idx < s_ip_idx)
3830 continue;
3831 err = inet6_fill_ifacaddr(skb, ifaca,
15e47304 3832 NETLINK_CB(cb->skb).portid,
234b27c3
ED		 3833 cb->nlh->nlmsg_seq,
3834 RTM_GETANYCAST,
3835 NLM_F_MULTI);
3836 if (err <= 0)
3837 break;
3838 }
3839 break;
3840 default:
3841 break;
3842 }
3843 read_unlock_bh(&idev->lock);
3844 *p_ip_idx = ip_idx;
3845 return err;
3846}
3847
1da177e4
LT		 3848static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
3849 enum addr_type_t type)
3850{
234b27c3
ED		 3851 struct net *net = sock_net(skb->sk);
3852 int h, s_h;
1da177e4
LT		 3853 int idx, ip_idx;
3854 int s_idx, s_ip_idx;
1da177e4 3855 struct net_device *dev;
234b27c3
ED		 3856 struct inet6_dev *idev;
3857 struct hlist_head *head;
3858 struct hlist_node *node;
1ab1457c 3859
234b27c3
ED		 3860 s_h = cb->args[0];
3861 s_idx = idx = cb->args[1];
3862 s_ip_idx = ip_idx = cb->args[2];
5d5619b4 3863
234b27c3
ED		 3864 rcu_read_lock();
3865 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
3866 idx = 0;
3867 head = &net->dev_index_head[h];
3868 hlist_for_each_entry_rcu(dev, node, head, index_hlist) {
3869 if (idx < s_idx)
3870 goto cont;
4b97efdf 3871 if (h > s_h || idx > s_idx)
234b27c3
ED		 3872 s_ip_idx = 0;
3873 ip_idx = 0;
e21e8467
SH		 3874 idev = __in6_dev_get(dev);
3875 if (!idev)
234b27c3
ED		 3876 goto cont;
3877
3878 if (in6_dump_addrs(idev, skb, cb, type,
3879 s_ip_idx, &ip_idx) <= 0)
3880 goto done;
7562f876 3881cont:
234b27c3
ED		 3882 idx++;
3883 }
1da177e4 3884 }
234b27c3
ED		 3885done:
3886 rcu_read_unlock();
3887 cb->args[0] = h;
3888 cb->args[1] = idx;
3889 cb->args[2] = ip_idx;
3890
1da177e4
LT		 3891 return skb->len;
3892}
3893
3894static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
3895{
3896 enum addr_type_t type = UNICAST_ADDR;
b854272b 3897
1da177e4
LT		 3898 return inet6_dump_addr(skb, cb, type);
3899}
3900
3901static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
3902{
3903 enum addr_type_t type = MULTICAST_ADDR;
b854272b 3904
1da177e4
LT		 3905 return inet6_dump_addr(skb, cb, type);
3906}
3907
3908
3909static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
3910{
3911 enum addr_type_t type = ANYCAST_ADDR;
b854272b 3912
1da177e4
LT		 3913 return inet6_dump_addr(skb, cb, type);
3914}
3915
8e5e8f30 3916static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh,
1b29fc2c 3917 void *arg)
6c223828 3918{
3b1e0a65 3919 struct net *net = sock_net(in_skb->sk);
1b29fc2c
TG		 3920 struct ifaddrmsg *ifm;
3921 struct nlattr *tb[IFA_MAX+1];
6c223828
NT		 3922 struct in6_addr *addr = NULL;
3923 struct net_device *dev = NULL;
3924 struct inet6_ifaddr *ifa;
3925 struct sk_buff *skb;
6c223828
NT		 3926 int err;
3927
1b29fc2c
TG		 3928 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3929 if (err < 0)
3930 goto errout;
3931
3932 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3933 if (addr == NULL) {
3934 err = -EINVAL;
3935 goto errout;
6c223828 3936 }
6c223828 3937
1b29fc2c 3938 ifm = nlmsg_data(nlh);
6c223828 3939 if (ifm->ifa_index)
6fda7350 3940 dev = __dev_get_by_index(net, ifm->ifa_index);
6c223828 3941
e21e8467
SH		 3942 ifa = ipv6_get_ifaddr(net, addr, dev, 1);
3943 if (!ifa) {
1b29fc2c
TG		 3944 err = -EADDRNOTAVAIL;
3945 goto errout;
3946 }
6c223828 3947
e21e8467
SH		 3948 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
3949 if (!skb) {
6c223828 3950 err = -ENOBUFS;
1b29fc2c 3951 goto errout_ifa;
6c223828
NT		 3952 }
3953
15e47304 3954 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).portid,
6c223828 3955 nlh->nlmsg_seq, RTM_NEWADDR, 0);
26932566
PM		 3956 if (err < 0) {
3957 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3958 WARN_ON(err == -EMSGSIZE);
3959 kfree_skb(skb);
3960 goto errout_ifa;
3961 }
15e47304 3962 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
1b29fc2c 3963errout_ifa:
6c223828 3964 in6_ifa_put(ifa);
1b29fc2c 3965errout:
6c223828 3966 return err;
6c223828
NT		 3967}
3968
1da177e4
LT		 3969static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
3970{
3971 struct sk_buff *skb;
c346dca1 3972 struct net *net = dev_net(ifa->idev->dev);
5d620266 3973 int err = -ENOBUFS;
1da177e4 3974
0ab6803b 3975 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
5d620266
TG		 3976 if (skb == NULL)
3977 goto errout;
3978
3979 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
26932566
PM		 3980 if (err < 0) {
3981 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3982 WARN_ON(err == -EMSGSIZE);
3983 kfree_skb(skb);
3984 goto errout;
3985 }
1ce85fe4
PNA		 3986 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
3987 return;
5d620266
TG		 3988errout:
3989 if (err < 0)
6fda7350 3990 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
1da177e4
LT		 3991}
3992
b6f99a21 3993static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
1da177e4
LT		 3994 __s32 *array, int bytes)
3995{
04561c1f
TG		 3996 BUG_ON(bytes < (DEVCONF_MAX * 4));
3997
1da177e4
LT		 3998 memset(array, 0, bytes);
3999 array[DEVCONF_FORWARDING] = cnf->forwarding;
4000 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
4001 array[DEVCONF_MTU6] = cnf->mtu6;
4002 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
4003 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
4004 array[DEVCONF_AUTOCONF] = cnf->autoconf;
4005 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
4006 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
93908d19
TG		 4007 array[DEVCONF_RTR_SOLICIT_INTERVAL] =
4008 jiffies_to_msecs(cnf->rtr_solicit_interval);
4009 array[DEVCONF_RTR_SOLICIT_DELAY] =
4010 jiffies_to_msecs(cnf->rtr_solicit_delay);
1da177e4
LT		 4011 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
4012#ifdef CONFIG_IPV6_PRIVACY
4013 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
4014 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
4015 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
4016 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
4017 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
4018#endif
4019 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
65f5c7c1 4020 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
c4fd30eb 4021 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
930d6ff2
YH		 4022#ifdef CONFIG_IPV6_ROUTER_PREF
4023 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
93908d19
TG		 4024 array[DEVCONF_RTR_PROBE_INTERVAL] =
4025 jiffies_to_msecs(cnf->rtr_probe_interval);
fa03ef38 4026#ifdef CONFIG_IPV6_ROUTE_INFO
09c884d4
YH		 4027 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
4028#endif
930d6ff2 4029#endif
fbea49e1 4030 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
0bcbc926 4031 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
95c385b4
NH		 4032#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4033 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
4034#endif
7bc570c8
YH		 4035#ifdef CONFIG_IPV6_MROUTE
4036 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
4037#endif
778d80be 4038 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
1b34be74 4039 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
c3faca05 4040 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
5cb04436 4041 array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify;
1da177e4
LT		 4042}
4043
b382b191
TG		 4044static inline size_t inet6_ifla6_size(void)
4045{
4046 return nla_total_size(4) /* IFLA_INET6_FLAGS */
4047 + nla_total_size(sizeof(struct ifla_cacheinfo))
4048 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
4049 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
4050 + nla_total_size(ICMP6_MIB_MAX * 8); /* IFLA_INET6_ICMP6STATS */
4051}
4052
339bf98f
TG		 4053static inline size_t inet6_if_nlmsg_size(void)
4054{
4055 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
4056 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
4057 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
4058 + nla_total_size(4) /* IFLA_MTU */
4059 + nla_total_size(4) /* IFLA_LINK */
b382b191 4060 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */
339bf98f 4061}
c5396a31 4062
be281e55 4063static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib,
7d720c3e 4064 int items, int bytes)
7f7d9a6b
HX		 4065{
4066 int i;
4067 int pad = bytes - sizeof(u64) * items;
4068 BUG_ON(pad < 0);
4069
4070 /* Use put_unaligned() because stats may not be aligned for u64. */
4071 put_unaligned(items, &stats[0]);
4072 for (i = 1; i < items; i++)
be281e55 4073 put_unaligned(atomic_long_read(&mib[i]), &stats[i]);
7f7d9a6b
HX		 4074
4075 memset(&stats[items], 0, pad);
4076}
4077
4ce3c183
ED		 4078static inline void __snmp6_fill_stats64(u64 *stats, void __percpu **mib,
4079 int items, int bytes, size_t syncpoff)
4080{
4081 int i;
4082 int pad = bytes - sizeof(u64) * items;
4083 BUG_ON(pad < 0);
4084
4085 /* Use put_unaligned() because stats may not be aligned for u64. */
4086 put_unaligned(items, &stats[0]);
4087 for (i = 1; i < items; i++)
4088 put_unaligned(snmp_fold_field64(mib, i, syncpoff), &stats[i]);
4089
4090 memset(&stats[items], 0, pad);
4091}
4092
7f7d9a6b
HX		 4093static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
4094 int bytes)
4095{
e21e8467 4096 switch (attrtype) {
7f7d9a6b 4097 case IFLA_INET6_STATS:
4ce3c183
ED		 4098 __snmp6_fill_stats64(stats, (void __percpu **)idev->stats.ipv6,
4099 IPSTATS_MIB_MAX, bytes, offsetof(struct ipstats_mib, syncp));
7f7d9a6b
HX		 4100 break;
4101 case IFLA_INET6_ICMP6STATS:
be281e55 4102 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, ICMP6_MIB_MAX, bytes);
7f7d9a6b
HX		 4103 break;
4104 }
4105}
4106
b382b191
TG		 4107static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev)
4108{
4109 struct nlattr *nla;
4110 struct ifla_cacheinfo ci;
4111
c78679e8
DM		 4112 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags))
4113 goto nla_put_failure;
b382b191 4114 ci.max_reasm_len = IPV6_MAXPLEN;
24912420
DM		 4115 ci.tstamp = cstamp_delta(idev->tstamp);
4116 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time);
4117 ci.retrans_time = jiffies_to_msecs(idev->nd_parms->retrans_time);
c78679e8
DM		 4118 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci))
4119 goto nla_put_failure;
b382b191
TG		 4120 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
4121 if (nla == NULL)
4122 goto nla_put_failure;
4123 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
4124
4125 /* XXX - MC not implemented */
4126
4127 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
4128 if (nla == NULL)
4129 goto nla_put_failure;
4130 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
4131
4132 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
4133 if (nla == NULL)
4134 goto nla_put_failure;
4135 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
4136
4137 return 0;
4138
4139nla_put_failure:
4140 return -EMSGSIZE;
4141}
4142
4143static size_t inet6_get_link_af_size(const struct net_device *dev)
4144{
4145 if (!__in6_dev_get(dev))
4146 return 0;
4147
4148 return inet6_ifla6_size();
4149}
4150
4151static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev)
4152{
4153 struct inet6_dev *idev = __in6_dev_get(dev);
4154
4155 if (!idev)
4156 return -ENODATA;
4157
4158 if (inet6_fill_ifla6_attrs(skb, idev) < 0)
4159 return -EMSGSIZE;
4160
4161 return 0;
4162}
4163
1ab1457c 4164static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
15e47304 4165 u32 portid, u32 seq, int event, unsigned int flags)
1da177e4 4166{
04561c1f 4167 struct net_device *dev = idev->dev;
04561c1f
TG		 4168 struct ifinfomsg *hdr;
4169 struct nlmsghdr *nlh;
4170 void *protoinfo;
04561c1f 4171
15e47304 4172 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags);
04561c1f 4173 if (nlh == NULL)
26932566 4174 return -EMSGSIZE;
04561c1f
TG		 4175
4176 hdr = nlmsg_data(nlh);
4177 hdr->ifi_family = AF_INET6;
4178 hdr->__ifi_pad = 0;
4179 hdr->ifi_type = dev->type;
4180 hdr->ifi_index = dev->ifindex;
4181 hdr->ifi_flags = dev_get_flags(dev);
4182 hdr->ifi_change = 0;
4183
c78679e8
DM		 4184 if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
4185 (dev->addr_len &&
4186 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
4187 nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
4188 (dev->ifindex != dev->iflink &&
4189 nla_put_u32(skb, IFLA_LINK, dev->iflink)))
4190 goto nla_put_failure;
04561c1f
TG		 4191 protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
4192 if (protoinfo == NULL)
4193 goto nla_put_failure;
1da177e4 4194
b382b191 4195 if (inet6_fill_ifla6_attrs(skb, idev) < 0)
bf99f1bd 4196 goto nla_put_failure;
1da177e4 4197
04561c1f
TG		 4198 nla_nest_end(skb, protoinfo);
4199 return nlmsg_end(skb, nlh);
1da177e4 4200
04561c1f 4201nla_put_failure:
26932566
PM		 4202 nlmsg_cancel(skb, nlh);
4203 return -EMSGSIZE;
1da177e4
LT		 4204}
4205
4206static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
4207{
3b1e0a65 4208 struct net *net = sock_net(skb->sk);
84d2697d 4209 int h, s_h;
434a8a58 4210 int idx = 0, s_idx;
1da177e4
LT		 4211 struct net_device *dev;
4212 struct inet6_dev *idev;
84d2697d
ED		 4213 struct hlist_head *head;
4214 struct hlist_node *node;
1da177e4 4215
84d2697d
ED		 4216 s_h = cb->args[0];
4217 s_idx = cb->args[1];
4218
4219 rcu_read_lock();
4220 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4221 idx = 0;
4222 head = &net->dev_index_head[h];
4223 hlist_for_each_entry_rcu(dev, node, head, index_hlist) {
4224 if (idx < s_idx)
4225 goto cont;
4226 idev = __in6_dev_get(dev);
4227 if (!idev)
4228 goto cont;
4229 if (inet6_fill_ifinfo(skb, idev,
15e47304 4230 NETLINK_CB(cb->skb).portid,
84d2697d
ED		 4231 cb->nlh->nlmsg_seq,
4232 RTM_NEWLINK, NLM_F_MULTI) <= 0)
4233 goto out;
7562f876 4234cont:
84d2697d
ED		 4235 idx++;
4236 }
1da177e4 4237 }
84d2697d
ED		 4238out:
4239 rcu_read_unlock();
4240 cb->args[1] = idx;
4241 cb->args[0] = h;
1da177e4
LT		 4242
4243 return skb->len;
4244}
4245
4246void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
4247{
4248 struct sk_buff *skb;
c346dca1 4249 struct net *net = dev_net(idev->dev);
8d7a76c9 4250 int err = -ENOBUFS;
1ab1457c 4251
339bf98f 4252 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
8d7a76c9
TG		 4253 if (skb == NULL)
4254 goto errout;
4255
4256 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
26932566
PM		 4257 if (err < 0) {
4258 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
4259 WARN_ON(err == -EMSGSIZE);
4260 kfree_skb(skb);
4261 goto errout;
4262 }
5f75a104 4263 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC);
1ce85fe4 4264 return;
8d7a76c9
TG		 4265errout:
4266 if (err < 0)
5f75a104 4267 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err);
1da177e4
LT		 4268}
4269
339bf98f
TG		 4270static inline size_t inet6_prefix_nlmsg_size(void)
4271{
4272 return NLMSG_ALIGN(sizeof(struct prefixmsg))
4273 + nla_total_size(sizeof(struct in6_addr))
4274 + nla_total_size(sizeof(struct prefix_cacheinfo));
4275}
c5396a31 4276
1da177e4 4277static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
15e47304 4278 struct prefix_info *pinfo, u32 portid, u32 seq,
6051e2f4 4279 int event, unsigned int flags)
1da177e4 4280{
6051e2f4
TG		 4281 struct prefixmsg *pmsg;
4282 struct nlmsghdr *nlh;
1da177e4
LT		 4283 struct prefix_cacheinfo ci;
4284
15e47304 4285 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags);
6051e2f4 4286 if (nlh == NULL)
26932566 4287 return -EMSGSIZE;
6051e2f4
TG		 4288
4289 pmsg = nlmsg_data(nlh);
1da177e4 4290 pmsg->prefix_family = AF_INET6;
8a47077a
PM		 4291 pmsg->prefix_pad1 = 0;
4292 pmsg->prefix_pad2 = 0;
1da177e4
LT		 4293 pmsg->prefix_ifindex = idev->dev->ifindex;
4294 pmsg->prefix_len = pinfo->prefix_len;
4295 pmsg->prefix_type = pinfo->type;
8a47077a 4296 pmsg->prefix_pad3 = 0;
1da177e4
LT		 4297 pmsg->prefix_flags = 0;
4298 if (pinfo->onlink)
4299 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
4300 if (pinfo->autoconf)
4301 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
4302
c78679e8
DM		 4303 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix))
4304 goto nla_put_failure;
1da177e4
LT		 4305 ci.preferred_time = ntohl(pinfo->prefered);
4306 ci.valid_time = ntohl(pinfo->valid);
c78679e8
DM		 4307 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci))
4308 goto nla_put_failure;
6051e2f4 4309 return nlmsg_end(skb, nlh);
1da177e4 4310
6051e2f4 4311nla_put_failure:
26932566
PM		 4312 nlmsg_cancel(skb, nlh);
4313 return -EMSGSIZE;
1da177e4
LT		 4314}
4315
1ab1457c 4316static void inet6_prefix_notify(int event, struct inet6_dev *idev,
1da177e4
LT		 4317 struct prefix_info *pinfo)
4318{
4319 struct sk_buff *skb;
c346dca1 4320 struct net *net = dev_net(idev->dev);
8c384bfa 4321 int err = -ENOBUFS;
1da177e4 4322
339bf98f 4323 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
8c384bfa
TG		 4324 if (skb == NULL)
4325 goto errout;
4326
4327 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
26932566
PM		 4328 if (err < 0) {
4329 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
4330 WARN_ON(err == -EMSGSIZE);
4331 kfree_skb(skb);
4332 goto errout;
4333 }
1ce85fe4
PNA		 4334 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
4335 return;
8c384bfa
TG		 4336errout:
4337 if (err < 0)
6fda7350 4338 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
1da177e4
LT		 4339}
4340
1da177e4
LT		 4341static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4342{
4343 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
4344
4345 switch (event) {
4346 case RTM_NEWADDR:
95c385b4
NH		 4347 /*
4348 * If the address was optimistic
4349 * we inserted the route at the start of
4350 * our DAD process, so we don't need
4351 * to do it again
4352 */
4353 if (!(ifp->rt->rt6i_node))
4354 ip6_ins_rt(ifp->rt);
1da177e4
LT		 4355 if (ifp->idev->cnf.forwarding)
4356 addrconf_join_anycast(ifp);
4357 break;
4358 case RTM_DELADDR:
4359 if (ifp->idev->cnf.forwarding)
4360 addrconf_leave_anycast(ifp);
4361 addrconf_leave_solict(ifp->idev, &ifp->addr);
d8d1f30b 4362 dst_hold(&ifp->rt->dst);
93fa159a 4363
73a8bd74 4364 if (ip6_del_rt(ifp->rt))
d8d1f30b 4365 dst_free(&ifp->rt->dst);
1da177e4
LT		 4366 break;
4367 }
4368}
4369
4370static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4371{
8814c4b5 4372 rcu_read_lock_bh();
1da177e4
LT		 4373 if (likely(ifp->idev->dead == 0))
4374 __ipv6_ifa_notify(event, ifp);
8814c4b5 4375 rcu_read_unlock_bh();
1da177e4
LT		 4376}
4377
4378#ifdef CONFIG_SYSCTL
4379
4380static
8d65af78 4381int addrconf_sysctl_forward(ctl_table *ctl, int write,
1da177e4
LT		 4382 void __user *buffer, size_t *lenp, loff_t *ppos)
4383{
4384 int *valp = ctl->data;
4385 int val = *valp;
88af182e 4386 loff_t pos = *ppos;
013d97e9 4387 ctl_table lctl;
1da177e4
LT		 4388 int ret;
4389
013d97e9
FR		 4390 /*
4391 * ctl->data points to idev->cnf.forwarding, we should
4392 * not modify it until we get the rtnl lock.
4393 */
4394 lctl = *ctl;
4395 lctl.data = &val;
4396
4397 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
1da177e4 4398
c8fecf22 4399 if (write)
b325fddb 4400 ret = addrconf_fixup_forwarding(ctl, valp, val);
88af182e
EB		 4401 if (ret)
4402 *ppos = pos;
1ab1457c 4403 return ret;
1da177e4
LT		 4404}
4405
56d417b1
BH		 4406static void dev_disable_change(struct inet6_dev *idev)
4407{
4408 if (!idev || !idev->dev)
4409 return;
4410
4411 if (idev->cnf.disable_ipv6)
4412 addrconf_notify(NULL, NETDEV_DOWN, idev->dev);
4413 else
4414 addrconf_notify(NULL, NETDEV_UP, idev->dev);
4415}
4416
4417static void addrconf_disable_change(struct net *net, __s32 newf)
4418{
4419 struct net_device *dev;
4420 struct inet6_dev *idev;
4421
c6d14c84
ED		 4422 rcu_read_lock();
4423 for_each_netdev_rcu(net, dev) {
56d417b1
BH		 4424 idev = __in6_dev_get(dev);
4425 if (idev) {
4426 int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
4427 idev->cnf.disable_ipv6 = newf;
4428 if (changed)
4429 dev_disable_change(idev);
4430 }
56d417b1 4431 }
c6d14c84 4432 rcu_read_unlock();
56d417b1
BH		 4433}
4434
013d97e9 4435static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf)
56d417b1
BH		 4436{
4437 struct net *net;
013d97e9
FR		 4438 int old;
4439
4440 if (!rtnl_trylock())
4441 return restart_syscall();
56d417b1
BH		 4442
4443 net = (struct net *)table->extra2;
013d97e9
FR		 4444 old = *p;
4445 *p = newf;
56d417b1 4446
013d97e9
FR		 4447 if (p == &net->ipv6.devconf_dflt->disable_ipv6) {
4448 rtnl_unlock();
56d417b1 4449 return 0;
88af182e 4450 }
56d417b1
BH		 4451
4452 if (p == &net->ipv6.devconf_all->disable_ipv6) {
56d417b1
BH		 4453 net->ipv6.devconf_dflt->disable_ipv6 = newf;
4454 addrconf_disable_change(net, newf);
013d97e9 4455 } else if ((!newf) ^ (!old))
56d417b1
BH		 4456 dev_disable_change((struct inet6_dev *)table->extra1);
4457
4458 rtnl_unlock();
4459 return 0;
4460}
4461
4462static
8d65af78 4463int addrconf_sysctl_disable(ctl_table *ctl, int write,
56d417b1
BH		 4464 void __user *buffer, size_t *lenp, loff_t *ppos)
4465{
4466 int *valp = ctl->data;
4467 int val = *valp;
88af182e 4468 loff_t pos = *ppos;
013d97e9 4469 ctl_table lctl;
56d417b1
BH		 4470 int ret;
4471
013d97e9
FR		 4472 /*
4473 * ctl->data points to idev->cnf.disable_ipv6, we should
4474 * not modify it until we get the rtnl lock.
4475 */
4476 lctl = *ctl;
4477 lctl.data = &val;
4478
4479 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
56d417b1
BH		 4480
4481 if (write)
4482 ret = addrconf_disable_ipv6(ctl, valp, val);
88af182e
EB		 4483 if (ret)
4484 *ppos = pos;
56d417b1
BH		 4485 return ret;
4486}
4487
1da177e4
LT		 4488static struct addrconf_sysctl_table
4489{
4490 struct ctl_table_header *sysctl_header;
f6a07b29 4491 ctl_table addrconf_vars[DEVCONF_MAX+1];
ab32ea5d 4492} addrconf_sysctl __read_mostly = {
1da177e4
LT		 4493 .sysctl_header = NULL,
4494 .addrconf_vars = {
1ab1457c 4495 {
e21e8467
SH		 4496 .procname = "forwarding",
4497 .data = &ipv6_devconf.forwarding,
4498 .maxlen = sizeof(int),
4499 .mode = 0644,
4500 .proc_handler = addrconf_sysctl_forward,
1da177e4
LT		 4501 },
4502 {
e21e8467
SH		 4503 .procname = "hop_limit",
4504 .data = &ipv6_devconf.hop_limit,
4505 .maxlen = sizeof(int),
4506 .mode = 0644,
4507 .proc_handler = proc_dointvec,
1da177e4
LT		 4508 },
4509 {
e21e8467
SH		 4510 .procname = "mtu",
4511 .data = &ipv6_devconf.mtu6,
4512 .maxlen = sizeof(int),
4513 .mode = 0644,
4514 .proc_handler = proc_dointvec,
1da177e4
LT		 4515 },
4516 {
e21e8467
SH		 4517 .procname = "accept_ra",
4518 .data = &ipv6_devconf.accept_ra,
4519 .maxlen = sizeof(int),
4520 .mode = 0644,
4521 .proc_handler = proc_dointvec,
1da177e4
LT		 4522 },
4523 {
e21e8467
SH		 4524 .procname = "accept_redirects",
4525 .data = &ipv6_devconf.accept_redirects,
4526 .maxlen = sizeof(int),
4527 .mode = 0644,
4528 .proc_handler = proc_dointvec,
1da177e4
LT		 4529 },
4530 {
e21e8467
SH		 4531 .procname = "autoconf",
4532 .data = &ipv6_devconf.autoconf,
4533 .maxlen = sizeof(int),
4534 .mode = 0644,
4535 .proc_handler = proc_dointvec,
1da177e4
LT		 4536 },
4537 {
e21e8467
SH		 4538 .procname = "dad_transmits",
4539 .data = &ipv6_devconf.dad_transmits,
4540 .maxlen = sizeof(int),
4541 .mode = 0644,
4542 .proc_handler = proc_dointvec,
1da177e4
LT		 4543 },
4544 {
e21e8467
SH		 4545 .procname = "router_solicitations",
4546 .data = &ipv6_devconf.rtr_solicits,
4547 .maxlen = sizeof(int),
4548 .mode = 0644,
4549 .proc_handler = proc_dointvec,
1da177e4
LT		 4550 },
4551 {
e21e8467
SH		 4552 .procname = "router_solicitation_interval",
4553 .data = &ipv6_devconf.rtr_solicit_interval,
4554 .maxlen = sizeof(int),
4555 .mode = 0644,
4556 .proc_handler = proc_dointvec_jiffies,
1da177e4
LT		 4557 },
4558 {
e21e8467
SH		 4559 .procname = "router_solicitation_delay",
4560 .data = &ipv6_devconf.rtr_solicit_delay,
4561 .maxlen = sizeof(int),
4562 .mode = 0644,
4563 .proc_handler = proc_dointvec_jiffies,
1da177e4
LT		 4564 },
4565 {
e21e8467
SH		 4566 .procname = "force_mld_version",
4567 .data = &ipv6_devconf.force_mld_version,
4568 .maxlen = sizeof(int),
4569 .mode = 0644,
4570 .proc_handler = proc_dointvec,
1da177e4
LT		 4571 },
4572#ifdef CONFIG_IPV6_PRIVACY
4573 {
e21e8467
SH		 4574 .procname = "use_tempaddr",
4575 .data = &ipv6_devconf.use_tempaddr,
4576 .maxlen = sizeof(int),
4577 .mode = 0644,
4578 .proc_handler = proc_dointvec,
1da177e4
LT		 4579 },
4580 {
e21e8467
SH		 4581 .procname = "temp_valid_lft",
4582 .data = &ipv6_devconf.temp_valid_lft,
4583 .maxlen = sizeof(int),
4584 .mode = 0644,
4585 .proc_handler = proc_dointvec,
1da177e4
LT		 4586 },
4587 {
e21e8467
SH		 4588 .procname = "temp_prefered_lft",
4589 .data = &ipv6_devconf.temp_prefered_lft,
4590 .maxlen = sizeof(int),
4591 .mode = 0644,
4592 .proc_handler = proc_dointvec,
1da177e4
LT		 4593 },
4594 {
e21e8467
SH		 4595 .procname = "regen_max_retry",
4596 .data = &ipv6_devconf.regen_max_retry,
4597 .maxlen = sizeof(int),
4598 .mode = 0644,
4599 .proc_handler = proc_dointvec,
1da177e4
LT		 4600 },
4601 {
e21e8467
SH		 4602 .procname = "max_desync_factor",
4603 .data = &ipv6_devconf.max_desync_factor,
4604 .maxlen = sizeof(int),
4605 .mode = 0644,
4606 .proc_handler = proc_dointvec,
1da177e4
LT		 4607 },
4608#endif
4609 {
e21e8467
SH		 4610 .procname = "max_addresses",
4611 .data = &ipv6_devconf.max_addresses,
4612 .maxlen = sizeof(int),
4613 .mode = 0644,
4614 .proc_handler = proc_dointvec,
1da177e4 4615 },
65f5c7c1 4616 {
e21e8467
SH		 4617 .procname = "accept_ra_defrtr",
4618 .data = &ipv6_devconf.accept_ra_defrtr,
4619 .maxlen = sizeof(int),
4620 .mode = 0644,
4621 .proc_handler = proc_dointvec,
65f5c7c1 4622 },
c4fd30eb 4623 {
e21e8467
SH		 4624 .procname = "accept_ra_pinfo",
4625 .data = &ipv6_devconf.accept_ra_pinfo,
4626 .maxlen = sizeof(int),
4627 .mode = 0644,
4628 .proc_handler = proc_dointvec,
c4fd30eb 4629 },
930d6ff2
YH		 4630#ifdef CONFIG_IPV6_ROUTER_PREF
4631 {
e21e8467
SH		 4632 .procname = "accept_ra_rtr_pref",
4633 .data = &ipv6_devconf.accept_ra_rtr_pref,
4634 .maxlen = sizeof(int),
4635 .mode = 0644,
4636 .proc_handler = proc_dointvec,
930d6ff2 4637 },
52e16356 4638 {
e21e8467
SH		 4639 .procname = "router_probe_interval",
4640 .data = &ipv6_devconf.rtr_probe_interval,
4641 .maxlen = sizeof(int),
4642 .mode = 0644,
4643 .proc_handler = proc_dointvec_jiffies,
52e16356 4644 },
fa03ef38 4645#ifdef CONFIG_IPV6_ROUTE_INFO
09c884d4 4646 {
e21e8467
SH		 4647 .procname = "accept_ra_rt_info_max_plen",
4648 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
4649 .maxlen = sizeof(int),
4650 .mode = 0644,
4651 .proc_handler = proc_dointvec,
09c884d4
YH		 4652 },
4653#endif
930d6ff2 4654#endif
fbea49e1 4655 {
e21e8467
SH		 4656 .procname = "proxy_ndp",
4657 .data = &ipv6_devconf.proxy_ndp,
4658 .maxlen = sizeof(int),
4659 .mode = 0644,
4660 .proc_handler = proc_dointvec,
fbea49e1 4661 },
0bcbc926 4662 {
e21e8467
SH		 4663 .procname = "accept_source_route",
4664 .data = &ipv6_devconf.accept_source_route,
4665 .maxlen = sizeof(int),
4666 .mode = 0644,
4667 .proc_handler = proc_dointvec,
0bcbc926 4668 },
95c385b4
NH		 4669#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4670 {
e21e8467
SH		 4671 .procname = "optimistic_dad",
4672 .data = &ipv6_devconf.optimistic_dad,
4673 .maxlen = sizeof(int),
4674 .mode = 0644,
4675 .proc_handler = proc_dointvec,
95c385b4
NH		 4676
4677 },
7bc570c8
YH		 4678#endif
4679#ifdef CONFIG_IPV6_MROUTE
4680 {
e21e8467
SH		 4681 .procname = "mc_forwarding",
4682 .data = &ipv6_devconf.mc_forwarding,
4683 .maxlen = sizeof(int),
4684 .mode = 0444,
4685 .proc_handler = proc_dointvec,
7bc570c8 4686 },
95c385b4 4687#endif
778d80be 4688 {
e21e8467
SH		 4689 .procname = "disable_ipv6",
4690 .data = &ipv6_devconf.disable_ipv6,
4691 .maxlen = sizeof(int),
4692 .mode = 0644,
4693 .proc_handler = addrconf_sysctl_disable,
778d80be 4694 },
1b34be74 4695 {
e21e8467
SH		 4696 .procname = "accept_dad",
4697 .data = &ipv6_devconf.accept_dad,
4698 .maxlen = sizeof(int),
4699 .mode = 0644,
4700 .proc_handler = proc_dointvec,
1b34be74 4701 },
f7734fdf 4702 {
f7734fdf
OP		 4703 .procname = "force_tllao",
4704 .data = &ipv6_devconf.force_tllao,
4705 .maxlen = sizeof(int),
4706 .mode = 0644,
4707 .proc_handler = proc_dointvec
4708 },
5cb04436
HFS		 4709 {
4710 .procname = "ndisc_notify",
4711 .data = &ipv6_devconf.ndisc_notify,
4712 .maxlen = sizeof(int),
4713 .mode = 0644,
4714 .proc_handler = proc_dointvec
4715 },
1da177e4 4716 {
f8572d8f 4717 /* sentinel */
1da177e4
LT		 4718 }
4719 },
1da177e4
LT		 4720};
4721
bff16c2f 4722static int __addrconf_sysctl_register(struct net *net, char *dev_name,
f8572d8f 4723 struct inet6_dev *idev, struct ipv6_devconf *p)
1da177e4
LT		 4724{
4725 int i;
1da177e4 4726 struct addrconf_sysctl_table *t;
6105e293 4727 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ];
1dab6222 4728
af879cc7 4729 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
1da177e4 4730 if (t == NULL)
f68635e6
PE		 4731 goto out;
4732
bcdd553f 4733 for (i = 0; t->addrconf_vars[i].data; i++) {
e21e8467 4734 t->addrconf_vars[i].data += (char *)p - (char *)&ipv6_devconf;
1da177e4 4735 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
bff16c2f 4736 t->addrconf_vars[i].extra2 = net;
1da177e4 4737 }
1da177e4 4738
6105e293 4739 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name);
1da177e4 4740
6105e293 4741 t->sysctl_header = register_net_sysctl(net, path, t->addrconf_vars);
1da177e4 4742 if (t->sysctl_header == NULL)
6105e293 4743 goto free;
f68635e6
PE		 4744
4745 p->sysctl = t;
95897312 4746 return 0;
1da177e4 4747
f68635e6 4748free:
1da177e4 4749 kfree(t);
f68635e6 4750out:
95897312 4751 return -ENOBUFS;
1da177e4
LT		 4752}
4753
408c4768
PE		 4754static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
4755{
4756 struct addrconf_sysctl_table *t;
4757
4758 if (p->sysctl == NULL)
4759 return;
4760
4761 t = p->sysctl;
4762 p->sysctl = NULL;
ff538818 4763 unregister_net_sysctl_table(t->sysctl_header);
408c4768
PE		 4764 kfree(t);
4765}
4766
f52295a9
PE		 4767static void addrconf_sysctl_register(struct inet6_dev *idev)
4768{
54716e3b 4769 neigh_sysctl_register(idev->dev, idev->nd_parms, "ipv6",
f8572d8f 4770 &ndisc_ifinfo_sysctl_change);
c346dca1 4771 __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
f8572d8f 4772 idev, &idev->cnf);
f52295a9
PE		 4773}
4774
408c4768 4775static void addrconf_sysctl_unregister(struct inet6_dev *idev)
1da177e4 4776{
408c4768
PE		 4777 __addrconf_sysctl_unregister(&idev->cnf);
4778 neigh_sysctl_unregister(idev->nd_parms);
1da177e4
LT		 4779}
4780
4781
4782#endif
4783
2c8c1e72 4784static int __net_init addrconf_init_net(struct net *net)
e0da5a48
PE		 4785{
4786 int err;
4787 struct ipv6_devconf *all, *dflt;
4788
4789 err = -ENOMEM;
4790 all = &ipv6_devconf;
4791 dflt = &ipv6_devconf_dflt;
4792
09ad9bc7 4793 if (!net_eq(net, &init_net)) {
e0da5a48
PE		 4794 all = kmemdup(all, sizeof(ipv6_devconf), GFP_KERNEL);
4795 if (all == NULL)
4796 goto err_alloc_all;
4797
4798 dflt = kmemdup(dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
4799 if (dflt == NULL)
4800 goto err_alloc_dflt;
56d417b1
BH		 4801 } else {
4802 /* these will be inherited by all namespaces */
4803 dflt->autoconf = ipv6_defaults.autoconf;
4804 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
e0da5a48
PE		 4805 }
4806
4807 net->ipv6.devconf_all = all;
4808 net->ipv6.devconf_dflt = dflt;
4809
4810#ifdef CONFIG_SYSCTL
f8572d8f 4811 err = __addrconf_sysctl_register(net, "all", NULL, all);
e0da5a48
PE		 4812 if (err < 0)
4813 goto err_reg_all;
4814
f8572d8f 4815 err = __addrconf_sysctl_register(net, "default", NULL, dflt);
e0da5a48
PE		 4816 if (err < 0)
4817 goto err_reg_dflt;
4818#endif
4819 return 0;
4820
4821#ifdef CONFIG_SYSCTL
4822err_reg_dflt:
4823 __addrconf_sysctl_unregister(all);
4824err_reg_all:
4825 kfree(dflt);
4826#endif
4827err_alloc_dflt:
4828 kfree(all);
4829err_alloc_all:
4830 return err;
4831}
4832
2c8c1e72 4833static void __net_exit addrconf_exit_net(struct net *net)
e0da5a48
PE		 4834{
4835#ifdef CONFIG_SYSCTL
4836 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
4837 __addrconf_sysctl_unregister(net->ipv6.devconf_all);
4838#endif
09ad9bc7 4839 if (!net_eq(net, &init_net)) {
e0da5a48
PE		 4840 kfree(net->ipv6.devconf_dflt);
4841 kfree(net->ipv6.devconf_all);
4842 }
4843}
4844
4845static struct pernet_operations addrconf_ops = {
4846 .init = addrconf_init_net,
4847 .exit = addrconf_exit_net,
4848};
4849
1da177e4
LT		 4850/*
4851 * Device notifier
4852 */
4853
4854int register_inet6addr_notifier(struct notifier_block *nb)
4855{
1ab1457c 4856 return atomic_notifier_chain_register(&inet6addr_chain, nb);
1da177e4 4857}
7159039a
YH		 4858EXPORT_SYMBOL(register_inet6addr_notifier);
4859
1da177e4
LT		 4860int unregister_inet6addr_notifier(struct notifier_block *nb)
4861{
e21e8467 4862 return atomic_notifier_chain_unregister(&inet6addr_chain, nb);
1da177e4 4863}
7159039a
YH		 4864EXPORT_SYMBOL(unregister_inet6addr_notifier);
4865
b382b191
TG		 4866static struct rtnl_af_ops inet6_ops = {
4867 .family = AF_INET6,
4868 .fill_link_af = inet6_fill_link_af,
4869 .get_link_af_size = inet6_get_link_af_size,
b382b191
TG		 4870};
4871
1da177e4
LT		 4872/*
4873 * Init / cleanup code
4874 */
4875
4876int __init addrconf_init(void)
4877{
c2e21293 4878 int i, err;
2a8cc6c8 4879
e21e8467
SH		 4880 err = ipv6_addr_label_init();
4881 if (err < 0) {
f3213831
JP		 4882 pr_crit("%s: cannot initialize default policy table: %d\n",
4883 __func__, err);
2cc6d2bf 4884 goto out;
2a8cc6c8 4885 }
1da177e4 4886
2cc6d2bf
NH		 4887 err = register_pernet_subsys(&addrconf_ops);
4888 if (err < 0)
4889 goto out_addrlabel;
e0da5a48 4890
1da177e4
LT		 4891 /* The addrconf netdev notifier requires that loopback_dev
4892 * has it's ipv6 private information allocated and setup
4893 * before it can bring up and give link-local addresses
4894 * to other devices which are up.
4895 *
4896 * Unfortunately, loopback_dev is not necessarily the first
4897 * entry in the global dev_base list of net devices. In fact,
4898 * it is likely to be the very last entry on that list.
4899 * So this causes the notifier registry below to try and
4900 * give link-local addresses to all devices besides loopback_dev
4901 * first, then loopback_dev, which cases all the non-loopback_dev
4902 * devices to fail to get a link-local address.
4903 *
4904 * So, as a temporary fix, allocate the ipv6 structure for
4905 * loopback_dev first by hand.
4906 * Longer term, all of the dependencies ipv6 has upon the loopback
4907 * device and it being up should be removed.
4908 */
4909 rtnl_lock();
2774c7ab 4910 if (!ipv6_add_dev(init_net.loopback_dev))
1da177e4
LT		 4911 err = -ENOMEM;
4912 rtnl_unlock();
4913 if (err)
e0da5a48 4914 goto errlo;
1da177e4 4915
c2e21293 4916 for (i = 0; i < IN6_ADDR_HSIZE; i++)
4917 INIT_HLIST_HEAD(&inet6_addr_lst[i]);
4918
1da177e4
LT		 4919 register_netdevice_notifier(&ipv6_dev_notf);
4920
1da177e4 4921 addrconf_verify(0);
c127ea2c 4922
b382b191
TG		 4923 err = rtnl_af_register(&inet6_ops);
4924 if (err < 0)
4925 goto errout_af;
4926
c7ac8679
GR		 4927 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo,
4928 NULL);
c127ea2c
TG		 4929 if (err < 0)
4930 goto errout;
4931
4932 /* Only the first call to __rtnl_register can fail */
c7ac8679
GR		 4933 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL, NULL);
4934 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL, NULL);
4935 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr,
4936 inet6_dump_ifaddr, NULL);
4937 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL,
4938 inet6_dump_ifmcaddr, NULL);
4939 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL,
4940 inet6_dump_ifacaddr, NULL);
76f8f6cb
ND		 4941 __rtnl_register(PF_INET6, RTM_GETNETCONF, inet6_netconf_get_devconf,
4942 NULL, NULL);
c127ea2c 4943
2a8cc6c8
YH		 4944 ipv6_addr_label_rtnl_register();
4945
1da177e4 4946 return 0;
c127ea2c 4947errout:
b382b191
TG		 4948 rtnl_af_unregister(&inet6_ops);
4949errout_af:
c127ea2c 4950 unregister_netdevice_notifier(&ipv6_dev_notf);
e0da5a48
PE		 4951errlo:
4952 unregister_pernet_subsys(&addrconf_ops);
2cc6d2bf
NH		 4953out_addrlabel:
4954 ipv6_addr_label_cleanup();
4955out:
c127ea2c 4956 return err;
1da177e4
LT		 4957}
4958
09f7709f 4959void addrconf_cleanup(void)
1da177e4 4960{
176c39af 4961 struct net_device *dev;
1da177e4
LT		 4962 int i;
4963
4964 unregister_netdevice_notifier(&ipv6_dev_notf);
e0da5a48 4965 unregister_pernet_subsys(&addrconf_ops);
2cc6d2bf 4966 ipv6_addr_label_cleanup();
1da177e4
LT		 4967
4968 rtnl_lock();
4969
b382b191
TG		 4970 __rtnl_af_unregister(&inet6_ops);
4971
176c39af
DL		 4972 /* clean dev list */
4973 for_each_netdev(&init_net, dev) {
4974 if (__in6_dev_get(dev) == NULL)
4975 continue;
4976 addrconf_ifdown(dev, 1);
4977 }
4978 addrconf_ifdown(init_net.loopback_dev, 2);
4979
1da177e4
LT		 4980 /*
4981 * Check hash table.
4982 */
5c578aed 4983 spin_lock_bh(&addrconf_hash_lock);
c2e21293 4984 for (i = 0; i < IN6_ADDR_HSIZE; i++)
4985 WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
5c578aed 4986 spin_unlock_bh(&addrconf_hash_lock);
1da177e4
LT		 4987
4988 del_timer(&addr_chk_timer);
1da177e4 4989 rtnl_unlock();
1da177e4 4990}
kernel source for telekom puls (alcatel/mediatek)