]> git.proxmox.com Git - mirror_ubuntu-jammy-kernel.git/blame - net/ipv6/addrconf.c
projects / mirror_ubuntu-jammy-kernel.git / blame
? search:
summary | shortlog | log | commit | commitdiff | tree
blob | blame (incremental) | history | HEAD
firewire net, ipv4 arp: Extend hardware address and remove driver-level packet inspec...
[mirror_ubuntu-jammy-kernel.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;
2c5e8933
HFS		 247const struct in6_addr in6addr_interfacelocal_allnodes = IN6ADDR_INTERFACELOCAL_ALLNODES_INIT;
248const struct in6_addr in6addr_interfacelocal_allrouters = IN6ADDR_INTERFACELOCAL_ALLROUTERS_INIT;
249const struct in6_addr in6addr_sitelocal_allrouters = IN6ADDR_SITELOCAL_ALLROUTERS_INIT;
1da177e4 250
f24e3d65 251/* Check if a valid qdisc is available */
05297949 252static inline bool addrconf_qdisc_ok(const struct net_device *dev)
f24e3d65 253{
05297949 254 return !qdisc_tx_is_noop(dev);
f24e3d65
MC		 255}
256
1da177e4
LT		 257static void addrconf_del_timer(struct inet6_ifaddr *ifp)
258{
259 if (del_timer(&ifp->timer))
260 __in6_ifa_put(ifp);
261}
262
e21e8467 263enum addrconf_timer_t {
1da177e4
LT		 264 AC_NONE,
265 AC_DAD,
266 AC_RS,
267};
268
269static void addrconf_mod_timer(struct inet6_ifaddr *ifp,
270 enum addrconf_timer_t what,
271 unsigned long when)
272{
273 if (!del_timer(&ifp->timer))
274 in6_ifa_hold(ifp);
275
276 switch (what) {
277 case AC_DAD:
278 ifp->timer.function = addrconf_dad_timer;
279 break;
280 case AC_RS:
281 ifp->timer.function = addrconf_rs_timer;
282 break;
e21e8467
SH		 283 default:
284 break;
1da177e4
LT		 285 }
286 ifp->timer.expires = jiffies + when;
287 add_timer(&ifp->timer);
288}
289
7f7d9a6b
HX		 290static int snmp6_alloc_dev(struct inet6_dev *idev)
291{
7d720c3e 292 if (snmp_mib_init((void __percpu **)idev->stats.ipv6,
1823e4c8
ED		 293 sizeof(struct ipstats_mib),
294 __alignof__(struct ipstats_mib)) < 0)
7f7d9a6b 295 goto err_ip;
be281e55
ED		 296 idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device),
297 GFP_KERNEL);
298 if (!idev->stats.icmpv6dev)
7f7d9a6b 299 goto err_icmp;
be281e55
ED		 300 idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device),
301 GFP_KERNEL);
302 if (!idev->stats.icmpv6msgdev)
14878f75 303 goto err_icmpmsg;
7f7d9a6b
HX		 304
305 return 0;
306
14878f75 307err_icmpmsg:
be281e55 308 kfree(idev->stats.icmpv6dev);
7f7d9a6b 309err_icmp:
7d720c3e 310 snmp_mib_free((void __percpu **)idev->stats.ipv6);
7f7d9a6b 311err_ip:
aaf70ec7 312 return -ENOMEM;
7f7d9a6b
HX		 313}
314
16910b98 315static void snmp6_free_dev(struct inet6_dev *idev)
7f7d9a6b 316{
be281e55
ED		 317 kfree(idev->stats.icmpv6msgdev);
318 kfree(idev->stats.icmpv6dev);
7d720c3e 319 snmp_mib_free((void __percpu **)idev->stats.ipv6);
7f7d9a6b
HX		 320}
321
1da177e4
LT		 322/* Nobody refers to this device, we may destroy it. */
323
324void in6_dev_finish_destroy(struct inet6_dev *idev)
325{
326 struct net_device *dev = idev->dev;
547b792c 327
502a2ffd 328 WARN_ON(!list_empty(&idev->addr_list));
547b792c
IJ		 329 WARN_ON(idev->mc_list != NULL);
330
1da177e4 331#ifdef NET_REFCNT_DEBUG
91df42be 332 pr_debug("%s: %s\n", __func__, dev ? dev->name : "NIL");
1da177e4
LT		 333#endif
334 dev_put(dev);
335 if (!idev->dead) {
f3213831 336 pr_warn("Freeing alive inet6 device %p\n", idev);
1da177e4
LT		 337 return;
338 }
339 snmp6_free_dev(idev);
38f57d1a 340 kfree_rcu(idev, rcu);
1da177e4 341}
7159039a
YH		 342EXPORT_SYMBOL(in6_dev_finish_destroy);
343
8e5e8f30 344static struct inet6_dev *ipv6_add_dev(struct net_device *dev)
1da177e4
LT		 345{
346 struct inet6_dev *ndev;
347
348 ASSERT_RTNL();
349
350 if (dev->mtu < IPV6_MIN_MTU)
351 return NULL;
352
1ab1457c 353 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
322f74a4 354
1ab1457c
YH		 355 if (ndev == NULL)
356 return NULL;
322f74a4
IO		 357
358 rwlock_init(&ndev->lock);
359 ndev->dev = dev;
502a2ffd 360 INIT_LIST_HEAD(&ndev->addr_list);
361
c346dca1 362 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf));
322f74a4
IO		 363 ndev->cnf.mtu6 = dev->mtu;
364 ndev->cnf.sysctl = NULL;
365 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
366 if (ndev->nd_parms == NULL) {
367 kfree(ndev);
368 return NULL;
369 }
0187bdfb
BH		 370 if (ndev->cnf.forwarding)
371 dev_disable_lro(dev);
322f74a4
IO		 372 /* We refer to the device */
373 dev_hold(dev);
1da177e4 374
322f74a4
IO		 375 if (snmp6_alloc_dev(ndev) < 0) {
376 ADBG((KERN_WARNING
f3213831 377 "%s: cannot allocate memory for statistics; dev=%s.\n",
0dc47877 378 __func__, dev->name));
322f74a4 379 neigh_parms_release(&nd_tbl, ndev->nd_parms);
8603e33d
RL		 380 dev_put(dev);
381 kfree(ndev);
322f74a4
IO		 382 return NULL;
383 }
1da177e4 384
322f74a4
IO		 385 if (snmp6_register_dev(ndev) < 0) {
386 ADBG((KERN_WARNING
f3213831 387 "%s: cannot create /proc/net/dev_snmp6/%s\n",
0dc47877 388 __func__, dev->name));
322f74a4
IO		 389 neigh_parms_release(&nd_tbl, ndev->nd_parms);
390 ndev->dead = 1;
391 in6_dev_finish_destroy(ndev);
392 return NULL;
393 }
394
395 /* One reference from device. We must do this before
396 * we invoke __ipv6_regen_rndid().
397 */
398 in6_dev_hold(ndev);
1da177e4 399
1b34be74
YH		 400 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
401 ndev->cnf.accept_dad = -1;
402
07a93626 403#if IS_ENABLED(CONFIG_IPV6_SIT)
b077d7ab 404 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
f3213831 405 pr_info("%s: Disabled Multicast RS\n", dev->name);
b077d7ab
YH		 406 ndev->cnf.rtr_solicits = 0;
407 }
408#endif
409
1da177e4 410#ifdef CONFIG_IPV6_PRIVACY
372e6c8f 411 INIT_LIST_HEAD(&ndev->tempaddr_list);
b24b8a24 412 setup_timer(&ndev->regen_timer, ipv6_regen_rndid, (unsigned long)ndev);
322f74a4
IO		 413 if ((dev->flags&IFF_LOOPBACK) ||
414 dev->type == ARPHRD_TUNNEL ||
9625ed72 415 dev->type == ARPHRD_TUNNEL6 ||
0be669bb 416 dev->type == ARPHRD_SIT ||
0be669bb 417 dev->type == ARPHRD_NONE) {
322f74a4
IO		 418 ndev->cnf.use_tempaddr = -1;
419 } else {
420 in6_dev_hold(ndev);
421 ipv6_regen_rndid((unsigned long) ndev);
422 }
1da177e4
LT		 423#endif
424
f24e3d65 425 if (netif_running(dev) && addrconf_qdisc_ok(dev))
53aadcc9
HX		 426 ndev->if_flags |= IF_READY;
427
322f74a4
IO		 428 ipv6_mc_init_dev(ndev);
429 ndev->tstamp = jiffies;
f52295a9 430 addrconf_sysctl_register(ndev);
30c4cf57 431 /* protected by rtnl_lock */
cf778b00 432 rcu_assign_pointer(dev->ip6_ptr, ndev);
d88ae4cc 433
2c5e8933
HFS		 434 /* Join interface-local all-node multicast group */
435 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allnodes);
436
d88ae4cc 437 /* Join all-node multicast group */
f3ee4010 438 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);
d88ae4cc 439
d6ddef9e 440 /* Join all-router multicast group if forwarding is set */
8b2aaede 441 if (ndev->cnf.forwarding && (dev->flags & IFF_MULTICAST))
d6ddef9e
LW		 442 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
443
1da177e4
LT		 444 return ndev;
445}
446
8e5e8f30 447static struct inet6_dev *ipv6_find_idev(struct net_device *dev)
1da177e4
LT		 448{
449 struct inet6_dev *idev;
450
451 ASSERT_RTNL();
452
e21e8467
SH		 453 idev = __in6_dev_get(dev);
454 if (!idev) {
455 idev = ipv6_add_dev(dev);
456 if (!idev)
1da177e4
LT		 457 return NULL;
458 }
c5e33bdd 459
1da177e4
LT		 460 if (dev->flags&IFF_UP)
461 ipv6_mc_up(idev);
462 return idev;
463}
464
f3a1bfb1
ND		 465static int inet6_netconf_msgsize_devconf(int type)
466{
467 int size = NLMSG_ALIGN(sizeof(struct netconfmsg))
468 + nla_total_size(4); /* NETCONFA_IFINDEX */
469
76f8f6cb
ND		 470 /* type -1 is used for ALL */
471 if (type == -1 || type == NETCONFA_FORWARDING)
f3a1bfb1 472 size += nla_total_size(4);
b1afce95 473#ifdef CONFIG_IPV6_MROUTE
d67b8c61
ND		 474 if (type == -1 || type == NETCONFA_MC_FORWARDING)
475 size += nla_total_size(4);
b1afce95 476#endif
f3a1bfb1
ND		 477
478 return size;
479}
480
481static int inet6_netconf_fill_devconf(struct sk_buff *skb, int ifindex,
482 struct ipv6_devconf *devconf, u32 portid,
483 u32 seq, int event, unsigned int flags,
484 int type)
485{
486 struct nlmsghdr *nlh;
487 struct netconfmsg *ncm;
488
489 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg),
490 flags);
491 if (nlh == NULL)
492 return -EMSGSIZE;
493
494 ncm = nlmsg_data(nlh);
495 ncm->ncm_family = AF_INET6;
496
497 if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0)
498 goto nla_put_failure;
499
76f8f6cb
ND		 500 /* type -1 is used for ALL */
501 if ((type == -1 || type == NETCONFA_FORWARDING) &&
f3a1bfb1
ND		 502 nla_put_s32(skb, NETCONFA_FORWARDING, devconf->forwarding) < 0)
503 goto nla_put_failure;
b1afce95 504#ifdef CONFIG_IPV6_MROUTE
d67b8c61
ND		 505 if ((type == -1 || type == NETCONFA_MC_FORWARDING) &&
506 nla_put_s32(skb, NETCONFA_MC_FORWARDING,
507 devconf->mc_forwarding) < 0)
508 goto nla_put_failure;
b1afce95 509#endif
f3a1bfb1
ND		 510 return nlmsg_end(skb, nlh);
511
512nla_put_failure:
513 nlmsg_cancel(skb, nlh);
514 return -EMSGSIZE;
515}
516
d67b8c61
ND		 517void inet6_netconf_notify_devconf(struct net *net, int type, int ifindex,
518 struct ipv6_devconf *devconf)
f3a1bfb1
ND		 519{
520 struct sk_buff *skb;
521 int err = -ENOBUFS;
522
523 skb = nlmsg_new(inet6_netconf_msgsize_devconf(type), GFP_ATOMIC);
524 if (skb == NULL)
525 goto errout;
526
527 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 0, 0,
528 RTM_NEWNETCONF, 0, type);
529 if (err < 0) {
530 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
531 WARN_ON(err == -EMSGSIZE);
532 kfree_skb(skb);
533 goto errout;
534 }
535 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_NETCONF, NULL, GFP_ATOMIC);
536 return;
537errout:
bd779028 538 rtnl_set_sk_err(net, RTNLGRP_IPV6_NETCONF, err);
f3a1bfb1
ND		 539}
540
76f8f6cb
ND		 541static const struct nla_policy devconf_ipv6_policy[NETCONFA_MAX+1] = {
542 [NETCONFA_IFINDEX] = { .len = sizeof(int) },
543 [NETCONFA_FORWARDING] = { .len = sizeof(int) },
544};
545
546static int inet6_netconf_get_devconf(struct sk_buff *in_skb,
661d2967 547 struct nlmsghdr *nlh)
76f8f6cb
ND		 548{
549 struct net *net = sock_net(in_skb->sk);
550 struct nlattr *tb[NETCONFA_MAX+1];
551 struct netconfmsg *ncm;
552 struct sk_buff *skb;
553 struct ipv6_devconf *devconf;
554 struct inet6_dev *in6_dev;
555 struct net_device *dev;
556 int ifindex;
557 int err;
558
559 err = nlmsg_parse(nlh, sizeof(*ncm), tb, NETCONFA_MAX,
560 devconf_ipv6_policy);
561 if (err < 0)
562 goto errout;
563
564 err = EINVAL;
565 if (!tb[NETCONFA_IFINDEX])
566 goto errout;
567
568 ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]);
569 switch (ifindex) {
570 case NETCONFA_IFINDEX_ALL:
571 devconf = net->ipv6.devconf_all;
572 break;
573 case NETCONFA_IFINDEX_DEFAULT:
574 devconf = net->ipv6.devconf_dflt;
575 break;
576 default:
577 dev = __dev_get_by_index(net, ifindex);
578 if (dev == NULL)
579 goto errout;
580 in6_dev = __in6_dev_get(dev);
581 if (in6_dev == NULL)
582 goto errout;
583 devconf = &in6_dev->cnf;
584 break;
585 }
586
587 err = -ENOBUFS;
588 skb = nlmsg_new(inet6_netconf_msgsize_devconf(-1), GFP_ATOMIC);
589 if (skb == NULL)
590 goto errout;
591
592 err = inet6_netconf_fill_devconf(skb, ifindex, devconf,
593 NETLINK_CB(in_skb).portid,
594 nlh->nlmsg_seq, RTM_NEWNETCONF, 0,
595 -1);
596 if (err < 0) {
597 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
598 WARN_ON(err == -EMSGSIZE);
599 kfree_skb(skb);
600 goto errout;
601 }
602 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
603errout:
604 return err;
605}
606
7a674200
ND		 607static int inet6_netconf_dump_devconf(struct sk_buff *skb,
608 struct netlink_callback *cb)
609{
610 struct net *net = sock_net(skb->sk);
611 int h, s_h;
612 int idx, s_idx;
613 struct net_device *dev;
614 struct inet6_dev *idev;
615 struct hlist_head *head;
616
617 s_h = cb->args[0];
618 s_idx = idx = cb->args[1];
619
620 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
621 idx = 0;
622 head = &net->dev_index_head[h];
623 rcu_read_lock();
63998ac2
ND		 624 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^
625 net->dev_base_seq;
7a674200
ND		 626 hlist_for_each_entry_rcu(dev, head, index_hlist) {
627 if (idx < s_idx)
628 goto cont;
629 idev = __in6_dev_get(dev);
630 if (!idev)
631 goto cont;
632
633 if (inet6_netconf_fill_devconf(skb, dev->ifindex,
634 &idev->cnf,
635 NETLINK_CB(cb->skb).portid,
636 cb->nlh->nlmsg_seq,
637 RTM_NEWNETCONF,
638 NLM_F_MULTI,
639 -1) <= 0) {
640 rcu_read_unlock();
641 goto done;
642 }
63998ac2 643 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
7a674200
ND		 644cont:
645 idx++;
646 }
647 rcu_read_unlock();
648 }
649 if (h == NETDEV_HASHENTRIES) {
650 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL,
651 net->ipv6.devconf_all,
652 NETLINK_CB(cb->skb).portid,
653 cb->nlh->nlmsg_seq,
654 RTM_NEWNETCONF, NLM_F_MULTI,
655 -1) <= 0)
656 goto done;
657 else
658 h++;
659 }
660 if (h == NETDEV_HASHENTRIES + 1) {
661 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT,
662 net->ipv6.devconf_dflt,
663 NETLINK_CB(cb->skb).portid,
664 cb->nlh->nlmsg_seq,
665 RTM_NEWNETCONF, NLM_F_MULTI,
666 -1) <= 0)
667 goto done;
668 else
669 h++;
670 }
671done:
672 cb->args[0] = h;
673 cb->args[1] = idx;
674
675 return skb->len;
676}
677
1da177e4
LT		 678#ifdef CONFIG_SYSCTL
679static void dev_forward_change(struct inet6_dev *idev)
680{
681 struct net_device *dev;
682 struct inet6_ifaddr *ifa;
1da177e4
LT		 683
684 if (!idev)
685 return;
686 dev = idev->dev;
0187bdfb
BH		 687 if (idev->cnf.forwarding)
688 dev_disable_lro(dev);
1a940835 689 if (dev->flags & IFF_MULTICAST) {
2c5e8933 690 if (idev->cnf.forwarding) {
f3ee4010 691 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
2c5e8933
HFS		 692 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allrouters);
693 ipv6_dev_mc_inc(dev, &in6addr_sitelocal_allrouters);
694 } else {
f3ee4010 695 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
2c5e8933
HFS		 696 ipv6_dev_mc_dec(dev, &in6addr_interfacelocal_allrouters);
697 ipv6_dev_mc_dec(dev, &in6addr_sitelocal_allrouters);
698 }
1da177e4 699 }
502a2ffd 700
701 list_for_each_entry(ifa, &idev->addr_list, if_list) {
2c12a74c
MW		 702 if (ifa->flags&IFA_F_TENTATIVE)
703 continue;
1da177e4
LT		 704 if (idev->cnf.forwarding)
705 addrconf_join_anycast(ifa);
706 else
707 addrconf_leave_anycast(ifa);
708 }
f3a1bfb1
ND		 709 inet6_netconf_notify_devconf(dev_net(dev), NETCONFA_FORWARDING,
710 dev->ifindex, &idev->cnf);
1da177e4
LT		 711}
712
713
e186932b 714static void addrconf_forward_change(struct net *net, __s32 newf)
1da177e4
LT		 715{
716 struct net_device *dev;
717 struct inet6_dev *idev;
718
4acd4945 719 for_each_netdev(net, dev) {
1da177e4
LT		 720 idev = __in6_dev_get(dev);
721 if (idev) {
e186932b
PE		 722 int changed = (!idev->cnf.forwarding) ^ (!newf);
723 idev->cnf.forwarding = newf;
1da177e4
LT		 724 if (changed)
725 dev_forward_change(idev);
726 }
1da177e4 727 }
1da177e4 728}
c8fecf22 729
013d97e9 730static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf)
c8fecf22 731{
bff16c2f 732 struct net *net;
013d97e9
FR		 733 int old;
734
735 if (!rtnl_trylock())
736 return restart_syscall();
bff16c2f
PE		 737
738 net = (struct net *)table->extra2;
013d97e9
FR		 739 old = *p;
740 *p = newf;
b325fddb 741
013d97e9 742 if (p == &net->ipv6.devconf_dflt->forwarding) {
f3a1bfb1
ND		 743 if ((!newf) ^ (!old))
744 inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING,
745 NETCONFA_IFINDEX_DEFAULT,
746 net->ipv6.devconf_dflt);
013d97e9
FR		 747 rtnl_unlock();
748 return 0;
88af182e 749 }
c8fecf22 750
e186932b 751 if (p == &net->ipv6.devconf_all->forwarding) {
e186932b
PE		 752 net->ipv6.devconf_dflt->forwarding = newf;
753 addrconf_forward_change(net, newf);
f3a1bfb1
ND		 754 if ((!newf) ^ (!old))
755 inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING,
756 NETCONFA_IFINDEX_ALL,
757 net->ipv6.devconf_all);
013d97e9 758 } else if ((!newf) ^ (!old))
c8fecf22 759 dev_forward_change((struct inet6_dev *)table->extra1);
0187bdfb 760 rtnl_unlock();
c8fecf22 761
013d97e9 762 if (newf)
7b4da532 763 rt6_purge_dflt_routers(net);
b325fddb 764 return 1;
c8fecf22 765}
1da177e4
LT		 766#endif
767
5c578aed 768/* Nobody refers to this ifaddr, destroy it */
1da177e4
LT		 769void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
770{
c2e21293 771 WARN_ON(!hlist_unhashed(&ifp->addr_lst));
547b792c 772
1da177e4 773#ifdef NET_REFCNT_DEBUG
91df42be 774 pr_debug("%s\n", __func__);
1da177e4
LT		 775#endif
776
777 in6_dev_put(ifp->idev);
778
779 if (del_timer(&ifp->timer))
e21e8467 780 pr_notice("Timer is still running, when freeing ifa=%p\n", ifp);
1da177e4 781
e9d3e084 782 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
f3213831 783 pr_warn("Freeing alive inet6 address %p\n", ifp);
1da177e4
LT		 784 return;
785 }
94e187c0 786 ip6_rt_put(ifp->rt);
1da177e4 787
e5785985 788 kfree_rcu(ifp, rcu);
1da177e4
LT		 789}
790
e55ffac6
BH		 791static void
792ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
793{
502a2ffd 794 struct list_head *p;
8a6ce0c0 795 int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
e55ffac6
BH		 796
797 /*
798 * Each device address list is sorted in order of scope -
799 * global before linklocal.
800 */
502a2ffd 801 list_for_each(p, &idev->addr_list) {
802 struct inet6_ifaddr *ifa
803 = list_entry(p, struct inet6_ifaddr, if_list);
8a6ce0c0 804 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
e55ffac6
BH		 805 break;
806 }
807
b54c9b98 808 list_add_tail(&ifp->if_list, p);
e55ffac6
BH		 809}
810
ddbe5032 811static u32 inet6_addr_hash(const struct in6_addr *addr)
3eb84f49 812{
ddbe5032 813 return hash_32(ipv6_addr_hash(addr), IN6_ADDR_HSIZE_SHIFT);
3eb84f49
YH		 814}
815
1da177e4
LT		 816/* On success it returns ifp with increased reference count */
817
818static struct inet6_ifaddr *
819ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, int pfxlen,
e431b8c0 820 int scope, u32 flags)
1da177e4
LT		 821{
822 struct inet6_ifaddr *ifa = NULL;
823 struct rt6_info *rt;
3a88a81d 824 unsigned int hash;
1da177e4 825 int err = 0;
d68b8270
YH		 826 int addr_type = ipv6_addr_type(addr);
827
828 if (addr_type == IPV6_ADDR_ANY ||
829 addr_type & IPV6_ADDR_MULTICAST ||
830 (!(idev->dev->flags & IFF_LOOPBACK) &&
831 addr_type & IPV6_ADDR_LOOPBACK))
832 return ERR_PTR(-EADDRNOTAVAIL);
1da177e4 833
8814c4b5 834 rcu_read_lock_bh();
1da177e4
LT		 835 if (idev->dead) {
836 err = -ENODEV; /*XXX*/
837 goto out2;
838 }
839
56d417b1 840 if (idev->cnf.disable_ipv6) {
9bdd8d40
BH		 841 err = -EACCES;
842 goto out2;
843 }
844
5c578aed 845 spin_lock(&addrconf_hash_lock);
1da177e4
LT		 846
847 /* Ignore adding duplicate addresses on an interface */
c346dca1 848 if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) {
1da177e4
LT		 849 ADBG(("ipv6_add_addr: already assigned\n"));
850 err = -EEXIST;
851 goto out;
852 }
853
322f74a4 854 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
1da177e4
LT		 855
856 if (ifa == NULL) {
857 ADBG(("ipv6_add_addr: malloc failed\n"));
858 err = -ENOBUFS;
859 goto out;
860 }
861
8f031519 862 rt = addrconf_dst_alloc(idev, addr, false);
1da177e4
LT		 863 if (IS_ERR(rt)) {
864 err = PTR_ERR(rt);
865 goto out;
866 }
867
4e3fd7a0 868 ifa->addr = *addr;
1da177e4
LT		 869
870 spin_lock_init(&ifa->lock);
e9d3e084 871 spin_lock_init(&ifa->state_lock);
1da177e4 872 init_timer(&ifa->timer);
c2e21293 873 INIT_HLIST_NODE(&ifa->addr_lst);
1da177e4
LT		 874 ifa->timer.data = (unsigned long) ifa;
875 ifa->scope = scope;
876 ifa->prefix_len = pfxlen;
877 ifa->flags = flags | IFA_F_TENTATIVE;
878 ifa->cstamp = ifa->tstamp = jiffies;
879
57f5f544
KF		 880 ifa->rt = rt;
881
1da177e4
LT		 882 ifa->idev = idev;
883 in6_dev_hold(idev);
884 /* For caller */
885 in6_ifa_hold(ifa);
886
887 /* Add to big hash table */
ddbe5032 888 hash = inet6_addr_hash(addr);
1da177e4 889
5c578aed 890 hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]);
5c578aed 891 spin_unlock(&addrconf_hash_lock);
1da177e4
LT		 892
893 write_lock(&idev->lock);
894 /* Add to inet6_dev unicast addr list. */
e55ffac6 895 ipv6_link_dev_addr(idev, ifa);
1da177e4
LT		 896
897#ifdef CONFIG_IPV6_PRIVACY
898 if (ifa->flags&IFA_F_TEMPORARY) {
372e6c8f 899 list_add(&ifa->tmp_list, &idev->tempaddr_list);
1da177e4
LT		 900 in6_ifa_hold(ifa);
901 }
902#endif
903
1da177e4
LT		 904 in6_ifa_hold(ifa);
905 write_unlock(&idev->lock);
906out2:
8814c4b5 907 rcu_read_unlock_bh();
1da177e4 908
fd92833a 909 if (likely(err == 0))
e041c683 910 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_UP, ifa);
1da177e4
LT		 911 else {
912 kfree(ifa);
913 ifa = ERR_PTR(err);
914 }
915
916 return ifa;
917out:
5c578aed 918 spin_unlock(&addrconf_hash_lock);
1da177e4
LT		 919 goto out2;
920}
921
922/* This function wants to get referenced ifp and releases it before return */
923
924static void ipv6_del_addr(struct inet6_ifaddr *ifp)
925{
502a2ffd 926 struct inet6_ifaddr *ifa, *ifn;
1da177e4 927 struct inet6_dev *idev = ifp->idev;
4c5ff6a6 928 int state;
1da177e4
LT		 929 int deleted = 0, onlink = 0;
930 unsigned long expires = jiffies;
931
4c5ff6a6
HX		 932 spin_lock_bh(&ifp->state_lock);
933 state = ifp->state;
e9d3e084 934 ifp->state = INET6_IFADDR_STATE_DEAD;
4c5ff6a6
HX		 935 spin_unlock_bh(&ifp->state_lock);
936
937 if (state == INET6_IFADDR_STATE_DEAD)
938 goto out;
1da177e4 939
5c578aed 940 spin_lock_bh(&addrconf_hash_lock);
941 hlist_del_init_rcu(&ifp->addr_lst);
5c578aed 942 spin_unlock_bh(&addrconf_hash_lock);
1da177e4
LT		 943
944 write_lock_bh(&idev->lock);
945#ifdef CONFIG_IPV6_PRIVACY
946 if (ifp->flags&IFA_F_TEMPORARY) {
372e6c8f 947 list_del(&ifp->tmp_list);
948 if (ifp->ifpub) {
949 in6_ifa_put(ifp->ifpub);
950 ifp->ifpub = NULL;
1da177e4 951 }
372e6c8f 952 __in6_ifa_put(ifp);
1da177e4
LT		 953 }
954#endif
955
502a2ffd 956 list_for_each_entry_safe(ifa, ifn, &idev->addr_list, if_list) {
1da177e4 957 if (ifa == ifp) {
502a2ffd 958 list_del_init(&ifp->if_list);
1da177e4 959 __in6_ifa_put(ifp);
502a2ffd 960
1da177e4
LT		 961 if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0)
962 break;
963 deleted = 1;
1d142804 964 continue;
1da177e4
LT		 965 } else if (ifp->flags & IFA_F_PERMANENT) {
966 if (ipv6_prefix_equal(&ifa->addr, &ifp->addr,
967 ifp->prefix_len)) {
968 if (ifa->flags & IFA_F_PERMANENT) {
969 onlink = 1;
970 if (deleted)
971 break;
972 } else {
973 unsigned long lifetime;
974
975 if (!onlink)
976 onlink = -1;
977
978 spin_lock(&ifa->lock);
4bed72e4
YH		 979
980 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
981 /*
982 * Note: Because this address is
983 * not permanent, lifetime <
984 * LONG_MAX / HZ here.
985 */
1da177e4
LT		 986 if (time_before(expires,
987 ifa->tstamp + lifetime * HZ))
988 expires = ifa->tstamp + lifetime * HZ;
989 spin_unlock(&ifa->lock);
990 }
991 }
992 }
993 }
994 write_unlock_bh(&idev->lock);
995
b2238566
AV		 996 addrconf_del_timer(ifp);
997
1da177e4
LT		 998 ipv6_ifa_notify(RTM_DELADDR, ifp);
999
e041c683 1000 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifp);
1da177e4 1001
1da177e4
LT		 1002 /*
1003 * Purge or update corresponding prefix
1004 *
1005 * 1) we don't purge prefix here if address was not permanent.
1006 * prefix is managed by its own lifetime.
1007 * 2) if there're no addresses, delete prefix.
1008 * 3) if there're still other permanent address(es),
1009 * corresponding prefix is still permanent.
1010 * 4) otherwise, update prefix lifetime to the
1011 * longest valid lifetime among the corresponding
1012 * addresses on the device.
1013 * Note: subsequent RA will update lifetime.
1014 *
1015 * --yoshfuji
1016 */
1017 if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) {
1018 struct in6_addr prefix;
1019 struct rt6_info *rt;
64c6d08e 1020
1da177e4 1021 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len);
1da177e4 1022
21caa662
RK		 1023 rt = addrconf_get_prefix_route(&prefix,
1024 ifp->prefix_len,
1025 ifp->idev->dev,
1026 0, RTF_GATEWAY | RTF_DEFAULT);
1027
1028 if (rt) {
1da177e4 1029 if (onlink == 0) {
e0a1ad73 1030 ip6_del_rt(rt);
1da177e4
LT		 1031 rt = NULL;
1032 } else if (!(rt->rt6i_flags & RTF_EXPIRES)) {
1716a961 1033 rt6_set_expires(rt, expires);
1da177e4
LT		 1034 }
1035 }
94e187c0 1036 ip6_rt_put(rt);
1da177e4
LT		 1037 }
1038
c3968a85
DW		 1039 /* clean up prefsrc entries */
1040 rt6_remove_prefsrc(ifp);
4c5ff6a6 1041out:
1da177e4
LT		 1042 in6_ifa_put(ifp);
1043}
1044
1045#ifdef CONFIG_IPV6_PRIVACY
1046static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
1047{
1048 struct inet6_dev *idev = ifp->idev;
1049 struct in6_addr addr, *tmpaddr;
76f793e3 1050 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_tstamp, age;
eac55bf9 1051 unsigned long regen_advance;
1da177e4
LT		 1052 int tmp_plen;
1053 int ret = 0;
1054 int max_addresses;
95c385b4 1055 u32 addr_flags;
76f793e3 1056 unsigned long now = jiffies;
1da177e4
LT		 1057
1058 write_lock(&idev->lock);
1059 if (ift) {
1060 spin_lock_bh(&ift->lock);
1061 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
1062 spin_unlock_bh(&ift->lock);
1063 tmpaddr = &addr;
1064 } else {
1065 tmpaddr = NULL;
1066 }
1067retry:
1068 in6_dev_hold(idev);
1069 if (idev->cnf.use_tempaddr <= 0) {
1070 write_unlock(&idev->lock);
f3213831 1071 pr_info("%s: use_tempaddr is disabled\n", __func__);
1da177e4
LT		 1072 in6_dev_put(idev);
1073 ret = -1;
1074 goto out;
1075 }
1076 spin_lock_bh(&ifp->lock);
1077 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
1078 idev->cnf.use_tempaddr = -1; /*XXX*/
1079 spin_unlock_bh(&ifp->lock);
1080 write_unlock(&idev->lock);
f3213831
JP		 1081 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n",
1082 __func__);
1da177e4
LT		 1083 in6_dev_put(idev);
1084 ret = -1;
1085 goto out;
1086 }
1087 in6_ifa_hold(ifp);
1088 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
eb7e0575 1089 __ipv6_try_regen_rndid(idev, tmpaddr);
1da177e4 1090 memcpy(&addr.s6_addr[8], idev->rndid, 8);
76f793e3 1091 age = (now - ifp->tstamp) / HZ;
1da177e4
LT		 1092 tmp_valid_lft = min_t(__u32,
1093 ifp->valid_lft,
7a876b0e 1094 idev->cnf.temp_valid_lft + age);
1ab1457c
YH		 1095 tmp_prefered_lft = min_t(__u32,
1096 ifp->prefered_lft,
7a876b0e 1097 idev->cnf.temp_prefered_lft + age -
784e2710 1098 idev->cnf.max_desync_factor);
1da177e4
LT		 1099 tmp_plen = ifp->prefix_len;
1100 max_addresses = idev->cnf.max_addresses;
1da177e4
LT		 1101 tmp_tstamp = ifp->tstamp;
1102 spin_unlock_bh(&ifp->lock);
1103
eac55bf9
BB		 1104 regen_advance = idev->cnf.regen_max_retry *
1105 idev->cnf.dad_transmits *
1106 idev->nd_parms->retrans_time / HZ;
1da177e4 1107 write_unlock(&idev->lock);
95c385b4 1108
eac55bf9
BB		 1109 /* A temporary address is created only if this calculated Preferred
1110 * Lifetime is greater than REGEN_ADVANCE time units. In particular,
1111 * an implementation must not create a temporary address with a zero
1112 * Preferred Lifetime.
1113 */
1114 if (tmp_prefered_lft <= regen_advance) {
1115 in6_ifa_put(ifp);
1116 in6_dev_put(idev);
1117 ret = -1;
1118 goto out;
1119 }
1120
95c385b4
NH		 1121 addr_flags = IFA_F_TEMPORARY;
1122 /* set in addrconf_prefix_rcv() */
1123 if (ifp->flags & IFA_F_OPTIMISTIC)
1124 addr_flags |= IFA_F_OPTIMISTIC;
1125
1da177e4 1126 ift = !max_addresses ||
1ab1457c 1127 ipv6_count_addresses(idev) < max_addresses ?
1da177e4 1128 ipv6_add_addr(idev, &addr, tmp_plen,
95c385b4
NH		 1129 ipv6_addr_type(&addr)&IPV6_ADDR_SCOPE_MASK,
1130 addr_flags) : NULL;
3f0d2ba0 1131 if (IS_ERR_OR_NULL(ift)) {
1da177e4
LT		 1132 in6_ifa_put(ifp);
1133 in6_dev_put(idev);
f3213831 1134 pr_info("%s: retry temporary address regeneration\n", __func__);
1da177e4
LT		 1135 tmpaddr = &addr;
1136 write_lock(&idev->lock);
1137 goto retry;
1138 }
1139
1140 spin_lock_bh(&ift->lock);
1141 ift->ifpub = ifp;
1142 ift->valid_lft = tmp_valid_lft;
1143 ift->prefered_lft = tmp_prefered_lft;
76f793e3 1144 ift->cstamp = now;
1da177e4
LT		 1145 ift->tstamp = tmp_tstamp;
1146 spin_unlock_bh(&ift->lock);
1147
cf22f9a2 1148 addrconf_dad_start(ift);
1da177e4
LT		 1149 in6_ifa_put(ift);
1150 in6_dev_put(idev);
1151out:
1152 return ret;
1153}
1154#endif
1155
1156/*
072047e4 1157 * Choose an appropriate source address (RFC3484)
1da177e4 1158 */
a9b05723
YH		 1159enum {
1160 IPV6_SADDR_RULE_INIT = 0,
1161 IPV6_SADDR_RULE_LOCAL,
1162 IPV6_SADDR_RULE_SCOPE,
1163 IPV6_SADDR_RULE_PREFERRED,
1164#ifdef CONFIG_IPV6_MIP6
1165 IPV6_SADDR_RULE_HOA,
1166#endif
1167 IPV6_SADDR_RULE_OIF,
1168 IPV6_SADDR_RULE_LABEL,
1169#ifdef CONFIG_IPV6_PRIVACY
1170 IPV6_SADDR_RULE_PRIVACY,
1171#endif
1172 IPV6_SADDR_RULE_ORCHID,
1173 IPV6_SADDR_RULE_PREFIX,
1174 IPV6_SADDR_RULE_MAX
1175};
1176
072047e4 1177struct ipv6_saddr_score {
a9b05723
YH		 1178 int rule;
1179 int addr_type;
1180 struct inet6_ifaddr *ifa;
1181 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
1182 int scopedist;
1183 int matchlen;
072047e4
YH		 1184};
1185
a9b05723 1186struct ipv6_saddr_dst {
9acd9f3a 1187 const struct in6_addr *addr;
a9b05723
YH		 1188 int ifindex;
1189 int scope;
1190 int label;
7cbca67c 1191 unsigned int prefs;
a9b05723 1192};
072047e4 1193
b6f99a21 1194static inline int ipv6_saddr_preferred(int type)
1da177e4 1195{
45bb0060 1196 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
072047e4
YH		 1197 return 1;
1198 return 0;
1da177e4
LT		 1199}
1200
3de23255
BT		 1201static int ipv6_get_saddr_eval(struct net *net,
1202 struct ipv6_saddr_score *score,
a9b05723
YH		 1203 struct ipv6_saddr_dst *dst,
1204 int i)
1205{
1206 int ret;
1207
1208 if (i <= score->rule) {
1209 switch (i) {
1210 case IPV6_SADDR_RULE_SCOPE:
1211 ret = score->scopedist;
1212 break;
1213 case IPV6_SADDR_RULE_PREFIX:
1214 ret = score->matchlen;
1215 break;
1216 default:
1217 ret = !!test_bit(i, score->scorebits);
1218 }
1219 goto out;
1220 }
1221
1222 switch (i) {
1223 case IPV6_SADDR_RULE_INIT:
1224 /* Rule 0: remember if hiscore is not ready yet */
1225 ret = !!score->ifa;
1226 break;
1227 case IPV6_SADDR_RULE_LOCAL:
1228 /* Rule 1: Prefer same address */
1229 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1230 break;
1231 case IPV6_SADDR_RULE_SCOPE:
1232 /* Rule 2: Prefer appropriate scope
1233 *
1234 * ret
1235 * ^
1236 * -1 | d 15
1237 * ---+--+-+---> scope
1238 * |
1239 * | d is scope of the destination.
1240 * B-d | \
1241 * | \ <- smaller scope is better if
1242 * B-15 | \ if scope is enough for destinaion.
1243 * | ret = B - scope (-1 <= scope >= d <= 15).
1244 * d-C-1 | /
1245 * |/ <- greater is better
1246 * -C / if scope is not enough for destination.
1247 * /| ret = scope - C (-1 <= d < scope <= 15).
1248 *
1249 * d - C - 1 < B -15 (for all -1 <= d <= 15).
1250 * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1251 * Assume B = 0 and we get C > 29.
1252 */
1253 ret = __ipv6_addr_src_scope(score->addr_type);
1254 if (ret >= dst->scope)
1255 ret = -ret;
1256 else
1257 ret -= 128; /* 30 is enough */
1258 score->scopedist = ret;
1259 break;
1260 case IPV6_SADDR_RULE_PREFERRED:
1261 /* Rule 3: Avoid deprecated and optimistic addresses */
1262 ret = ipv6_saddr_preferred(score->addr_type) ||
1263 !(score->ifa->flags & (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC));
1264 break;
1265#ifdef CONFIG_IPV6_MIP6
1266 case IPV6_SADDR_RULE_HOA:
7cbca67c 1267 {
a9b05723 1268 /* Rule 4: Prefer home address */
7cbca67c
YH		 1269 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1270 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
a9b05723 1271 break;
7cbca67c 1272 }
a9b05723
YH		 1273#endif
1274 case IPV6_SADDR_RULE_OIF:
1275 /* Rule 5: Prefer outgoing interface */
1276 ret = (!dst->ifindex ||
1277 dst->ifindex == score->ifa->idev->dev->ifindex);
1278 break;
1279 case IPV6_SADDR_RULE_LABEL:
1280 /* Rule 6: Prefer matching label */
3de23255
BT		 1281 ret = ipv6_addr_label(net,
1282 &score->ifa->addr, score->addr_type,
a9b05723
YH		 1283 score->ifa->idev->dev->ifindex) == dst->label;
1284 break;
1285#ifdef CONFIG_IPV6_PRIVACY
1286 case IPV6_SADDR_RULE_PRIVACY:
7cbca67c 1287 {
a9b05723 1288 /* Rule 7: Prefer public address
25985edc 1289 * Note: prefer temporary address if use_tempaddr >= 2
a9b05723 1290 */
7cbca67c
YH		 1291 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1292 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1293 score->ifa->idev->cnf.use_tempaddr >= 2;
1294 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
a9b05723 1295 break;
7cbca67c 1296 }
a9b05723
YH		 1297#endif
1298 case IPV6_SADDR_RULE_ORCHID:
1299 /* Rule 8-: Prefer ORCHID vs ORCHID or
1300 * non-ORCHID vs non-ORCHID
1301 */
1302 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1303 ipv6_addr_orchid(dst->addr));
1304 break;
1305 case IPV6_SADDR_RULE_PREFIX:
1306 /* Rule 8: Use longest matching prefix */
91b4b04f
YH		 1307 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr);
1308 if (ret > score->ifa->prefix_len)
1309 ret = score->ifa->prefix_len;
1310 score->matchlen = ret;
a9b05723
YH		 1311 break;
1312 default:
1313 ret = 0;
1314 }
1315
1316 if (ret)
1317 __set_bit(i, score->scorebits);
1318 score->rule = i;
1319out:
1320 return ret;
1321}
1322
b3f644fc 1323int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev,
9acd9f3a 1324 const struct in6_addr *daddr, unsigned int prefs,
7cbca67c 1325 struct in6_addr *saddr)
1da177e4 1326{
a9b05723
YH		 1327 struct ipv6_saddr_score scores[2],
1328 *score = &scores[0], *hiscore = &scores[1];
a9b05723 1329 struct ipv6_saddr_dst dst;
072047e4 1330 struct net_device *dev;
a9b05723 1331 int dst_type;
1da177e4 1332
a9b05723
YH		 1333 dst_type = __ipv6_addr_type(daddr);
1334 dst.addr = daddr;
1335 dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1336 dst.scope = __ipv6_addr_src_scope(dst_type);
3de23255 1337 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
7cbca67c 1338 dst.prefs = prefs;
a9b05723
YH		 1339
1340 hiscore->rule = -1;
1341 hiscore->ifa = NULL;
1da177e4 1342
8814c4b5 1343 rcu_read_lock();
1da177e4 1344
c6d14c84 1345 for_each_netdev_rcu(net, dev) {
072047e4 1346 struct inet6_dev *idev;
072047e4 1347
a9b05723 1348 /* Candidate Source Address (section 4)
072047e4
YH		 1349 * - multicast and link-local destination address,
1350 * the set of candidate source address MUST only
1351 * include addresses assigned to interfaces
1352 * belonging to the same link as the outgoing
1353 * interface.
1354 * (- For site-local destination addresses, the
1355 * set of candidate source addresses MUST only
1356 * include addresses assigned to interfaces
1357 * belonging to the same site as the outgoing
1358 * interface.)
1359 */
a9b05723
YH		 1360 if (((dst_type & IPV6_ADDR_MULTICAST) ||
1361 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL) &&
1362 dst.ifindex && dev->ifindex != dst.ifindex)
072047e4 1363 continue;
1da177e4 1364
1da177e4 1365 idev = __in6_dev_get(dev);
072047e4
YH		 1366 if (!idev)
1367 continue;
1368
1369 read_lock_bh(&idev->lock);
502a2ffd 1370 list_for_each_entry(score->ifa, &idev->addr_list, if_list) {
a9b05723 1371 int i;
072047e4 1372
a9b05723 1373 /*
6b3ae80a
YH		 1374 * - Tentative Address (RFC2462 section 5.4)
1375 * - A tentative address is not considered
1376 * "assigned to an interface" in the traditional
95c385b4 1377 * sense, unless it is also flagged as optimistic.
6b3ae80a 1378 * - Candidate Source Address (section 4)
072047e4
YH		 1379 * - In any case, anycast addresses, multicast
1380 * addresses, and the unspecified address MUST
1381 * NOT be included in a candidate set.
1382 */
a9b05723
YH		 1383 if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1384 (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
6b3ae80a 1385 continue;
a9b05723
YH		 1386
1387 score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1388
1389 if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1390 score->addr_type & IPV6_ADDR_MULTICAST)) {
072047e4 1391 LIMIT_NETDEBUG(KERN_DEBUG
3b6d821c 1392 "ADDRCONF: unspecified / multicast address "
072047e4
YH		 1393 "assigned as unicast address on %s",
1394 dev->name);
1395 continue;
1396 }
1397
a9b05723
YH		 1398 score->rule = -1;
1399 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1400
1401 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1402 int minihiscore, miniscore;
1403
3de23255
BT		 1404 minihiscore = ipv6_get_saddr_eval(net, hiscore, &dst, i);
1405 miniscore = ipv6_get_saddr_eval(net, score, &dst, i);
a9b05723
YH		 1406
1407 if (minihiscore > miniscore) {
1408 if (i == IPV6_SADDR_RULE_SCOPE &&
1409 score->scopedist > 0) {
1410 /*
1411 * special case:
1412 * each remaining entry
1413 * has too small (not enough)
1414 * scope, because ifa entries
1415 * are sorted by their scope
1416 * values.
1417 */
1418 goto try_nextdev;
1419 }
1420 break;
1421 } else if (minihiscore < miniscore) {
a9b05723
YH		 1422 if (hiscore->ifa)
1423 in6_ifa_put(hiscore->ifa);
1424
1425 in6_ifa_hold(score->ifa);
1426
a0bffffc 1427 swap(hiscore, score);
a9b05723
YH		 1428
1429 /* restore our iterator */
1430 score->ifa = hiscore->ifa;
1431
1432 break;
1da177e4 1433 }
072047e4 1434 }
1da177e4 1435 }
a9b05723 1436try_nextdev:
072047e4 1437 read_unlock_bh(&idev->lock);
1da177e4 1438 }
8814c4b5 1439 rcu_read_unlock();
1da177e4 1440
a9b05723 1441 if (!hiscore->ifa)
072047e4 1442 return -EADDRNOTAVAIL;
1ab1457c 1443
4e3fd7a0 1444 *saddr = hiscore->ifa->addr;
a9b05723 1445 in6_ifa_put(hiscore->ifa);
072047e4 1446 return 0;
1da177e4 1447}
5e5f3f0f 1448EXPORT_SYMBOL(ipv6_dev_get_saddr);
1da177e4 1449
95c385b4
NH		 1450int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1451 unsigned char banned_flags)
1da177e4
LT		 1452{
1453 struct inet6_dev *idev;
1454 int err = -EADDRNOTAVAIL;
1455
8814c4b5 1456 rcu_read_lock();
e21e8467
SH		 1457 idev = __in6_dev_get(dev);
1458 if (idev) {
1da177e4
LT		 1459 struct inet6_ifaddr *ifp;
1460
1461 read_lock_bh(&idev->lock);
502a2ffd 1462 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1463 if (ifp->scope == IFA_LINK &&
1464 !(ifp->flags & banned_flags)) {
4e3fd7a0 1465 *addr = ifp->addr;
1da177e4
LT		 1466 err = 0;
1467 break;
1468 }
1469 }
1470 read_unlock_bh(&idev->lock);
1471 }
8814c4b5 1472 rcu_read_unlock();
1da177e4
LT		 1473 return err;
1474}
1475
1476static int ipv6_count_addresses(struct inet6_dev *idev)
1477{
1478 int cnt = 0;
1479 struct inet6_ifaddr *ifp;
1480
1481 read_lock_bh(&idev->lock);
502a2ffd 1482 list_for_each_entry(ifp, &idev->addr_list, if_list)
1da177e4
LT		 1483 cnt++;
1484 read_unlock_bh(&idev->lock);
1485 return cnt;
1486}
1487
b71d1d42 1488int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
bfeade08 1489 struct net_device *dev, int strict)
1da177e4 1490{
eedf042a 1491 struct inet6_ifaddr *ifp;
ddbe5032 1492 unsigned int hash = inet6_addr_hash(addr);
1da177e4 1493
5c578aed 1494 rcu_read_lock_bh();
b67bfe0d 1495 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
878628fb 1496 if (!net_eq(dev_net(ifp->idev->dev), net))
bfeade08 1497 continue;
1da177e4 1498 if (ipv6_addr_equal(&ifp->addr, addr) &&
eedf042a
SH		 1499 !(ifp->flags&IFA_F_TENTATIVE) &&
1500 (dev == NULL || ifp->idev->dev == dev ||
1501 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) {
1502 rcu_read_unlock_bh();
1503 return 1;
1da177e4
LT		 1504 }
1505 }
5c578aed 1506
eedf042a
SH		 1507 rcu_read_unlock_bh();
1508 return 0;
1da177e4 1509}
7159039a
YH		 1510EXPORT_SYMBOL(ipv6_chk_addr);
1511
3e81c6da
DM		 1512static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1513 struct net_device *dev)
1da177e4 1514{
ddbe5032 1515 unsigned int hash = inet6_addr_hash(addr);
c2e21293 1516 struct inet6_ifaddr *ifp;
1da177e4 1517
b67bfe0d 1518 hlist_for_each_entry(ifp, &inet6_addr_lst[hash], addr_lst) {
878628fb 1519 if (!net_eq(dev_net(ifp->idev->dev), net))
06bfe655 1520 continue;
1da177e4
LT		 1521 if (ipv6_addr_equal(&ifp->addr, addr)) {
1522 if (dev == NULL || ifp->idev->dev == dev)
3e81c6da 1523 return true;
1da177e4
LT		 1524 }
1525 }
3e81c6da 1526 return false;
1da177e4
LT		 1527}
1528
b71d1d42 1529int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev)
52eeeb84
YH		 1530{
1531 struct inet6_dev *idev;
1532 struct inet6_ifaddr *ifa;
1533 int onlink;
1534
1535 onlink = 0;
1536 rcu_read_lock();
1537 idev = __in6_dev_get(dev);
1538 if (idev) {
1539 read_lock_bh(&idev->lock);
502a2ffd 1540 list_for_each_entry(ifa, &idev->addr_list, if_list) {
52eeeb84
YH		 1541 onlink = ipv6_prefix_equal(addr, &ifa->addr,
1542 ifa->prefix_len);
1543 if (onlink)
1544 break;
1545 }
1546 read_unlock_bh(&idev->lock);
1547 }
1548 rcu_read_unlock();
1549 return onlink;
1550}
52eeeb84
YH		 1551EXPORT_SYMBOL(ipv6_chk_prefix);
1552
9acd9f3a 1553struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1cab3da6 1554 struct net_device *dev, int strict)
1da177e4 1555{
b79d1d54 1556 struct inet6_ifaddr *ifp, *result = NULL;
ddbe5032 1557 unsigned int hash = inet6_addr_hash(addr);
1da177e4 1558
5c578aed 1559 rcu_read_lock_bh();
b67bfe0d 1560 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
878628fb 1561 if (!net_eq(dev_net(ifp->idev->dev), net))
1cab3da6 1562 continue;
1da177e4
LT		 1563 if (ipv6_addr_equal(&ifp->addr, addr)) {
1564 if (dev == NULL || ifp->idev->dev == dev ||
1565 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
b79d1d54 1566 result = ifp;
1da177e4
LT		 1567 in6_ifa_hold(ifp);
1568 break;
1569 }
1570 }
1571 }
5c578aed 1572 rcu_read_unlock_bh();
1da177e4 1573
b79d1d54 1574 return result;
1da177e4
LT		 1575}
1576
1da177e4
LT		 1577/* Gets referenced address, destroys ifaddr */
1578
cc411d0b 1579static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
1da177e4 1580{
1da177e4
LT		 1581 if (ifp->flags&IFA_F_PERMANENT) {
1582 spin_lock_bh(&ifp->lock);
1583 addrconf_del_timer(ifp);
1584 ifp->flags |= IFA_F_TENTATIVE;
cc411d0b
BH		 1585 if (dad_failed)
1586 ifp->flags |= IFA_F_DADFAILED;
1da177e4 1587 spin_unlock_bh(&ifp->lock);
e2577a06
HX		 1588 if (dad_failed)
1589 ipv6_ifa_notify(0, ifp);
1da177e4
LT		 1590 in6_ifa_put(ifp);
1591#ifdef CONFIG_IPV6_PRIVACY
1592 } else if (ifp->flags&IFA_F_TEMPORARY) {
1593 struct inet6_ifaddr *ifpub;
1594 spin_lock_bh(&ifp->lock);
1595 ifpub = ifp->ifpub;
1596 if (ifpub) {
1597 in6_ifa_hold(ifpub);
1598 spin_unlock_bh(&ifp->lock);
1599 ipv6_create_tempaddr(ifpub, ifp);
1600 in6_ifa_put(ifpub);
1601 } else {
1602 spin_unlock_bh(&ifp->lock);
1603 }
1604 ipv6_del_addr(ifp);
1605#endif
1606 } else
1607 ipv6_del_addr(ifp);
1608}
1609
f2344a13
HX		 1610static int addrconf_dad_end(struct inet6_ifaddr *ifp)
1611{
1612 int err = -ENOENT;
1613
1614 spin_lock(&ifp->state_lock);
1615 if (ifp->state == INET6_IFADDR_STATE_DAD) {
1616 ifp->state = INET6_IFADDR_STATE_POSTDAD;
1617 err = 0;
1618 }
1619 spin_unlock(&ifp->state_lock);
1620
1621 return err;
1622}
1623
3c21edbd
YH		 1624void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1625{
1b34be74 1626 struct inet6_dev *idev = ifp->idev;
9bdd8d40 1627
853dc2e0
UB		 1628 if (addrconf_dad_end(ifp)) {
1629 in6_ifa_put(ifp);
f2344a13 1630 return;
853dc2e0 1631 }
f2344a13 1632
e87cc472
JP		 1633 net_info_ratelimited("%s: IPv6 duplicate address %pI6c detected!\n",
1634 ifp->idev->dev->name, &ifp->addr);
9bdd8d40 1635
1b34be74
YH		 1636 if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6) {
1637 struct in6_addr addr;
1638
1639 addr.s6_addr32[0] = htonl(0xfe800000);
1640 addr.s6_addr32[1] = 0;
1641
1642 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
1643 ipv6_addr_equal(&ifp->addr, &addr)) {
1644 /* DAD failed for link-local based on MAC address */
1645 idev->cnf.disable_ipv6 = 1;
9bdd8d40 1646
f3213831 1647 pr_info("%s: IPv6 being disabled!\n",
9bdd8d40 1648 ifp->idev->dev->name);
1b34be74
YH		 1649 }
1650 }
1651
cc411d0b 1652 addrconf_dad_stop(ifp, 1);
3c21edbd 1653}
1da177e4
LT		 1654
1655/* Join to solicited addr multicast group. */
1656
b71d1d42 1657void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr)
1da177e4
LT		 1658{
1659 struct in6_addr maddr;
1660
1661 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1662 return;
1663
1664 addrconf_addr_solict_mult(addr, &maddr);
1665 ipv6_dev_mc_inc(dev, &maddr);
1666}
1667
b71d1d42 1668void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr)
1da177e4
LT		 1669{
1670 struct in6_addr maddr;
1671
1672 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1673 return;
1674
1675 addrconf_addr_solict_mult(addr, &maddr);
1676 __ipv6_dev_mc_dec(idev, &maddr);
1677}
1678
20380731 1679static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1da177e4
LT		 1680{
1681 struct in6_addr addr;
2bda8a0c
BM		 1682 if (ifp->prefix_len == 127) /* RFC 6164 */
1683 return;
1da177e4
LT		 1684 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1685 if (ipv6_addr_any(&addr))
1686 return;
1687 ipv6_dev_ac_inc(ifp->idev->dev, &addr);
1688}
1689
20380731 1690static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1da177e4
LT		 1691{
1692 struct in6_addr addr;
32019e65
YH		 1693 if (ifp->prefix_len == 127) /* RFC 6164 */
1694 return;
1da177e4
LT		 1695 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1696 if (ipv6_addr_any(&addr))
1697 return;
1698 __ipv6_dev_ac_dec(ifp->idev, &addr);
1699}
1700
073a8e0e
YH		 1701static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
1702{
1703 if (dev->addr_len != ETH_ALEN)
1704 return -1;
1705 memcpy(eui, dev->dev_addr, 3);
1706 memcpy(eui + 5, dev->dev_addr + 3, 3);
1707
1708 /*
1709 * The zSeries OSA network cards can be shared among various
1710 * OS instances, but the OSA cards have only one MAC address.
1711 * This leads to duplicate address conflicts in conjunction
1712 * with IPv6 if more than one instance uses the same card.
1713 *
1714 * The driver for these cards can deliver a unique 16-bit
1715 * identifier for each instance sharing the same card. It is
1716 * placed instead of 0xFFFE in the interface identifier. The
1717 * "u" bit of the interface identifier is not inverted in this
1718 * case. Hence the resulting interface identifier has local
1719 * scope according to RFC2373.
1720 */
1721 if (dev->dev_id) {
1722 eui[3] = (dev->dev_id >> 8) & 0xFF;
1723 eui[4] = dev->dev_id & 0xFF;
1724 } else {
1725 eui[3] = 0xFF;
1726 eui[4] = 0xFE;
1727 eui[0] ^= 2;
1728 }
1729 return 0;
1730}
1731
06a4c1c5 1732static int addrconf_ifid_eui64(u8 *eui, struct net_device *dev)
1733{
1734 if (dev->addr_len != IEEE802154_ADDR_LEN)
1735 return -1;
1736 memcpy(eui, dev->dev_addr, 8);
5e98a36e 1737 eui[0] ^= 2;
06a4c1c5 1738 return 0;
1739}
1740
073a8e0e
YH		 1741static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1742{
1743 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1744 if (dev->addr_len != ARCNET_ALEN)
1745 return -1;
1746 memset(eui, 0, 7);
8e5e8f30 1747 eui[7] = *(u8 *)dev->dev_addr;
073a8e0e
YH		 1748 return 0;
1749}
1750
1751static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1752{
1753 if (dev->addr_len != INFINIBAND_ALEN)
1754 return -1;
1755 memcpy(eui, dev->dev_addr + 12, 8);
1756 eui[0] |= 2;
1757 return 0;
1758}
1759
c61393ea 1760static int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
dfd982ba 1761{
9af28511
SH		 1762 if (addr == 0)
1763 return -1;
dfd982ba
YH		 1764 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
1765 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
1766 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
1767 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
1768 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
1769 ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
1770 eui[1] = 0;
1771 eui[2] = 0x5E;
1772 eui[3] = 0xFE;
1773 memcpy(eui + 4, &addr, 4);
1774 return 0;
1775}
dfd982ba
YH		 1776
1777static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
1778{
1779 if (dev->priv_flags & IFF_ISATAP)
1780 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1781 return -1;
1782}
1783
aee80b54 1784static int addrconf_ifid_gre(u8 *eui, struct net_device *dev)
1785{
1786 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1787}
1788
1da177e4
LT		 1789static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1790{
1791 switch (dev->type) {
1792 case ARPHRD_ETHER:
1793 case ARPHRD_FDDI:
073a8e0e 1794 return addrconf_ifid_eui48(eui, dev);
1da177e4 1795 case ARPHRD_ARCNET:
073a8e0e 1796 return addrconf_ifid_arcnet(eui, dev);
1da177e4 1797 case ARPHRD_INFINIBAND:
073a8e0e 1798 return addrconf_ifid_infiniband(eui, dev);
c7dc89c0 1799 case ARPHRD_SIT:
dfd982ba 1800 return addrconf_ifid_sit(eui, dev);
aee80b54 1801 case ARPHRD_IPGRE:
1802 return addrconf_ifid_gre(eui, dev);
06a4c1c5 1803 case ARPHRD_IEEE802154:
1804 return addrconf_ifid_eui64(eui, dev);
1da177e4
LT		 1805 }
1806 return -1;
1807}
1808
1809static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1810{
1811 int err = -1;
1812 struct inet6_ifaddr *ifp;
1813
1814 read_lock_bh(&idev->lock);
502a2ffd 1815 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1da177e4
LT		 1816 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1817 memcpy(eui, ifp->addr.s6_addr+8, 8);
1818 err = 0;
1819 break;
1820 }
1821 }
1822 read_unlock_bh(&idev->lock);
1823 return err;
1824}
1825
1826#ifdef CONFIG_IPV6_PRIVACY
1827/* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
eb7e0575 1828static void __ipv6_regen_rndid(struct inet6_dev *idev)
1da177e4 1829{
1da177e4 1830regen:
955189ef 1831 get_random_bytes(idev->rndid, sizeof(idev->rndid));
1da177e4 1832 idev->rndid[0] &= ~0x02;
1da177e4
LT		 1833
1834 /*
1835 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1836 * check if generated address is not inappropriate
1837 *
1838 * - Reserved subnet anycast (RFC 2526)
1839 * 11111101 11....11 1xxxxxxx
c7dc89c0 1840 * - ISATAP (RFC4214) 6.1
1da177e4
LT		 1841 * 00-00-5E-FE-xx-xx-xx-xx
1842 * - value 0
1843 * - XXX: already assigned to an address on the device
1844 */
1ab1457c 1845 if (idev->rndid[0] == 0xfd &&
1da177e4
LT		 1846 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1847 (idev->rndid[7]&0x80))
1848 goto regen;
1849 if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1850 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1851 goto regen;
1852 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1853 goto regen;
1854 }
1da177e4
LT		 1855}
1856
1857static void ipv6_regen_rndid(unsigned long data)
1858{
1859 struct inet6_dev *idev = (struct inet6_dev *) data;
1860 unsigned long expires;
1861
8814c4b5 1862 rcu_read_lock_bh();
1da177e4
LT		 1863 write_lock_bh(&idev->lock);
1864
1865 if (idev->dead)
1866 goto out;
1867
eb7e0575 1868 __ipv6_regen_rndid(idev);
1ab1457c 1869
1da177e4 1870 expires = jiffies +
1ab1457c 1871 idev->cnf.temp_prefered_lft * HZ -
784e2710
BH		 1872 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time -
1873 idev->cnf.max_desync_factor * HZ;
1da177e4 1874 if (time_before(expires, jiffies)) {
f3213831
JP		 1875 pr_warn("%s: too short regeneration interval; timer disabled for %s\n",
1876 __func__, idev->dev->name);
1da177e4
LT		 1877 goto out;
1878 }
1879
1880 if (!mod_timer(&idev->regen_timer, expires))
1881 in6_dev_hold(idev);
1882
1883out:
1884 write_unlock_bh(&idev->lock);
8814c4b5 1885 rcu_read_unlock_bh();
1da177e4
LT		 1886 in6_dev_put(idev);
1887}
1888
eb7e0575 1889static void __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr)
8e5e8f30 1890{
1da177e4 1891 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
eb7e0575 1892 __ipv6_regen_rndid(idev);
1da177e4
LT		 1893}
1894#endif
1895
1896/*
1897 * Add prefix route.
1898 */
1899
1900static void
1901addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
e431b8c0 1902 unsigned long expires, u32 flags)
1da177e4 1903{
86872cb5
TG		 1904 struct fib6_config cfg = {
1905 .fc_table = RT6_TABLE_PREFIX,
1906 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1907 .fc_ifindex = dev->ifindex,
1908 .fc_expires = expires,
1909 .fc_dst_len = plen,
1910 .fc_flags = RTF_UP | flags,
c346dca1 1911 .fc_nlinfo.nl_net = dev_net(dev),
f410a1fb 1912 .fc_protocol = RTPROT_KERNEL,
86872cb5 1913 };
1da177e4 1914
4e3fd7a0 1915 cfg.fc_dst = *pfx;
1da177e4
LT		 1916
1917 /* Prevent useless cloning on PtP SIT.
1918 This thing is done here expecting that the whole
1919 class of non-broadcast devices need not cloning.
1920 */
07a93626 1921#if IS_ENABLED(CONFIG_IPV6_SIT)
86872cb5
TG		 1922 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
1923 cfg.fc_flags |= RTF_NONEXTHOP;
0be669bb 1924#endif
1da177e4 1925
86872cb5 1926 ip6_route_add(&cfg);
1da177e4
LT		 1927}
1928
14ef37b6
AH		 1929
1930static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
1931 int plen,
1932 const struct net_device *dev,
1933 u32 flags, u32 noflags)
1934{
1935 struct fib6_node *fn;
1936 struct rt6_info *rt = NULL;
1937 struct fib6_table *table;
1938
1939 table = fib6_get_table(dev_net(dev), RT6_TABLE_PREFIX);
1940 if (table == NULL)
1941 return NULL;
1942
5744dd9b 1943 read_lock_bh(&table->tb6_lock);
14ef37b6
AH		 1944 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0);
1945 if (!fn)
1946 goto out;
1947 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
d1918542 1948 if (rt->dst.dev->ifindex != dev->ifindex)
14ef37b6
AH		 1949 continue;
1950 if ((rt->rt6i_flags & flags) != flags)
1951 continue;
85da53bf 1952 if ((rt->rt6i_flags & noflags) != 0)
14ef37b6
AH		 1953 continue;
1954 dst_hold(&rt->dst);
1955 break;
1956 }
1957out:
5744dd9b 1958 read_unlock_bh(&table->tb6_lock);
14ef37b6
AH		 1959 return rt;
1960}
1961
1962
1da177e4
LT		 1963/* Create "default" multicast route to the interface */
1964
1965static void addrconf_add_mroute(struct net_device *dev)
1966{
86872cb5
TG		 1967 struct fib6_config cfg = {
1968 .fc_table = RT6_TABLE_LOCAL,
1969 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1970 .fc_ifindex = dev->ifindex,
1971 .fc_dst_len = 8,
1972 .fc_flags = RTF_UP,
c346dca1 1973 .fc_nlinfo.nl_net = dev_net(dev),
86872cb5
TG		 1974 };
1975
1976 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
1977
1978 ip6_route_add(&cfg);
1da177e4
LT		 1979}
1980
07a93626 1981#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4
LT		 1982static void sit_route_add(struct net_device *dev)
1983{
86872cb5
TG		 1984 struct fib6_config cfg = {
1985 .fc_table = RT6_TABLE_MAIN,
1986 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1987 .fc_ifindex = dev->ifindex,
1988 .fc_dst_len = 96,
1989 .fc_flags = RTF_UP | RTF_NONEXTHOP,
c346dca1 1990 .fc_nlinfo.nl_net = dev_net(dev),
86872cb5 1991 };
1da177e4
LT		 1992
1993 /* prefix length - 96 bits "::d.d.d.d" */
86872cb5 1994 ip6_route_add(&cfg);
1da177e4 1995}
0be669bb 1996#endif
1da177e4 1997
1da177e4
LT		 1998static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
1999{
2000 struct inet6_dev *idev;
2001
2002 ASSERT_RTNL();
2003
e21e8467
SH		 2004 idev = ipv6_find_idev(dev);
2005 if (!idev)
64e724f6
BH		 2006 return ERR_PTR(-ENOBUFS);
2007
2008 if (idev->cnf.disable_ipv6)
2009 return ERR_PTR(-EACCES);
1da177e4
LT		 2010
2011 /* Add default multicast route */
4af04aba
LW		 2012 if (!(dev->flags & IFF_LOOPBACK))
2013 addrconf_add_mroute(dev);
1da177e4 2014
1da177e4
LT		 2015 return idev;
2016}
2017
e6bff995 2018void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao)
1da177e4
LT		 2019{
2020 struct prefix_info *pinfo;
2021 __u32 valid_lft;
2022 __u32 prefered_lft;
2023 int addr_type;
1da177e4 2024 struct inet6_dev *in6_dev;
56d417b1 2025 struct net *net = dev_net(dev);
1da177e4
LT		 2026
2027 pinfo = (struct prefix_info *) opt;
1ab1457c 2028
1da177e4
LT		 2029 if (len < sizeof(struct prefix_info)) {
2030 ADBG(("addrconf: prefix option too short\n"));
2031 return;
2032 }
1ab1457c 2033
1da177e4
LT		 2034 /*
2035 * Validation checks ([ADDRCONF], page 19)
2036 */
2037
2038 addr_type = ipv6_addr_type(&pinfo->prefix);
2039
2040 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
2041 return;
2042
2043 valid_lft = ntohl(pinfo->valid);
2044 prefered_lft = ntohl(pinfo->prefered);
2045
2046 if (prefered_lft > valid_lft) {
e87cc472 2047 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n");
1da177e4
LT		 2048 return;
2049 }
2050
2051 in6_dev = in6_dev_get(dev);
2052
2053 if (in6_dev == NULL) {
e87cc472
JP		 2054 net_dbg_ratelimited("addrconf: device %s not configured\n",
2055 dev->name);
1da177e4
LT		 2056 return;
2057 }
2058
2059 /*
2060 * Two things going on here:
2061 * 1) Add routes for on-link prefixes
2062 * 2) Configure prefixes with the auto flag set
2063 */
2064
4bed72e4
YH		 2065 if (pinfo->onlink) {
2066 struct rt6_info *rt;
2067 unsigned long rt_expires;
2068
6f704992
YH		 2069 /* Avoid arithmetic overflow. Really, we could
2070 * save rt_expires in seconds, likely valid_lft,
2071 * but it would require division in fib gc, that it
2072 * not good.
2073 */
4bed72e4
YH		 2074 if (HZ > USER_HZ)
2075 rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
2076 else
2077 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
3dd4bc68 2078
4bed72e4
YH		 2079 if (addrconf_finite_timeout(rt_expires))
2080 rt_expires *= HZ;
1da177e4 2081
14ef37b6
AH		 2082 rt = addrconf_get_prefix_route(&pinfo->prefix,
2083 pinfo->prefix_len,
2084 dev,
2085 RTF_ADDRCONF | RTF_PREFIX_RT,
2086 RTF_GATEWAY | RTF_DEFAULT);
1da177e4 2087
14ef37b6 2088 if (rt) {
6f704992
YH		 2089 /* Autoconf prefix route */
2090 if (valid_lft == 0) {
2091 ip6_del_rt(rt);
2092 rt = NULL;
4bed72e4 2093 } else if (addrconf_finite_timeout(rt_expires)) {
6f704992 2094 /* not infinity */
1716a961 2095 rt6_set_expires(rt, jiffies + rt_expires);
6f704992 2096 } else {
1716a961 2097 rt6_clean_expires(rt);
1da177e4
LT		 2098 }
2099 } else if (valid_lft) {
6f704992 2100 clock_t expires = 0;
4bed72e4
YH		 2101 int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
2102 if (addrconf_finite_timeout(rt_expires)) {
6f704992
YH		 2103 /* not infinity */
2104 flags |= RTF_EXPIRES;
2105 expires = jiffies_to_clock_t(rt_expires);
2106 }
1da177e4 2107 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
6f704992 2108 dev, expires, flags);
1da177e4 2109 }
94e187c0 2110 ip6_rt_put(rt);
1da177e4
LT		 2111 }
2112
2113 /* Try to figure out our local address for this prefix */
2114
2115 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
8e5e8f30 2116 struct inet6_ifaddr *ifp;
1da177e4
LT		 2117 struct in6_addr addr;
2118 int create = 0, update_lft = 0;
2119
2120 if (pinfo->prefix_len == 64) {
2121 memcpy(&addr, &pinfo->prefix, 8);
2122 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
2123 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
2124 in6_dev_put(in6_dev);
2125 return;
2126 }
2127 goto ok;
2128 }
e87cc472
JP		 2129 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n",
2130 pinfo->prefix_len);
1da177e4
LT		 2131 in6_dev_put(in6_dev);
2132 return;
2133
2134ok:
2135
53b7997f 2136 ifp = ipv6_get_ifaddr(net, &addr, dev, 1);
1da177e4
LT		 2137
2138 if (ifp == NULL && valid_lft) {
2139 int max_addresses = in6_dev->cnf.max_addresses;
95c385b4
NH		 2140 u32 addr_flags = 0;
2141
2142#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2143 if (in6_dev->cnf.optimistic_dad &&
e6bff995 2144 !net->ipv6.devconf_all->forwarding && sllao)
95c385b4
NH		 2145 addr_flags = IFA_F_OPTIMISTIC;
2146#endif
1da177e4
LT		 2147
2148 /* Do not allow to create too much of autoconfigured
2149 * addresses; this would be too easy way to crash kernel.
2150 */
2151 if (!max_addresses ||
2152 ipv6_count_addresses(in6_dev) < max_addresses)
2153 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len,
95c385b4
NH		 2154 addr_type&IPV6_ADDR_SCOPE_MASK,
2155 addr_flags);
1da177e4 2156
3f0d2ba0 2157 if (IS_ERR_OR_NULL(ifp)) {
1da177e4
LT		 2158 in6_dev_put(in6_dev);
2159 return;
2160 }
2161
2162 update_lft = create = 1;
2163 ifp->cstamp = jiffies;
cf22f9a2 2164 addrconf_dad_start(ifp);
1da177e4
LT		 2165 }
2166
2167 if (ifp) {
2168 int flags;
2169 unsigned long now;
2170#ifdef CONFIG_IPV6_PRIVACY
2171 struct inet6_ifaddr *ift;
2172#endif
2173 u32 stored_lft;
2174
2175 /* update lifetime (RFC2462 5.5.3 e) */
2176 spin_lock(&ifp->lock);
2177 now = jiffies;
2178 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
2179 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
2180 else
2181 stored_lft = 0;
2182 if (!update_lft && stored_lft) {
2183 if (valid_lft > MIN_VALID_LIFETIME ||
2184 valid_lft > stored_lft)
2185 update_lft = 1;
2186 else if (stored_lft <= MIN_VALID_LIFETIME) {
2187 /* valid_lft <= stored_lft is always true */
a1ed0526
BH		 2188 /*
2189 * RFC 4862 Section 5.5.3e:
2190 * "Note that the preferred lifetime of
2191 * the corresponding address is always
2192 * reset to the Preferred Lifetime in
2193 * the received Prefix Information
2194 * option, regardless of whether the
2195 * valid lifetime is also reset or
2196 * ignored."
2197 *
2198 * So if the preferred lifetime in
2199 * this advertisement is different
2200 * than what we have stored, but the
2201 * valid lifetime is invalid, just
2202 * reset prefered_lft.
2203 *
2204 * We must set the valid lifetime
2205 * to the stored lifetime since we'll
2206 * be updating the timestamp below,
2207 * else we'll set it back to the
25985edc 2208 * minimum.
a1ed0526
BH		 2209 */
2210 if (prefered_lft != ifp->prefered_lft) {
2211 valid_lft = stored_lft;
2212 update_lft = 1;
2213 }
1da177e4
LT		 2214 } else {
2215 valid_lft = MIN_VALID_LIFETIME;
2216 if (valid_lft < prefered_lft)
2217 prefered_lft = valid_lft;
2218 update_lft = 1;
2219 }
2220 }
2221
2222 if (update_lft) {
2223 ifp->valid_lft = valid_lft;
2224 ifp->prefered_lft = prefered_lft;
2225 ifp->tstamp = now;
2226 flags = ifp->flags;
2227 ifp->flags &= ~IFA_F_DEPRECATED;
2228 spin_unlock(&ifp->lock);
2229
2230 if (!(flags&IFA_F_TENTATIVE))
2231 ipv6_ifa_notify(0, ifp);
2232 } else
2233 spin_unlock(&ifp->lock);
2234
2235#ifdef CONFIG_IPV6_PRIVACY
2236 read_lock_bh(&in6_dev->lock);
2237 /* update all temporary addresses in the list */
76f793e3
LC		 2238 list_for_each_entry(ift, &in6_dev->tempaddr_list,
2239 tmp_list) {
2240 int age, max_valid, max_prefered;
2241
c6fbfac2
BB		 2242 if (ifp != ift->ifpub)
2243 continue;
2244
76f793e3
LC		 2245 /*
2246 * RFC 4941 section 3.3:
2247 * If a received option will extend the lifetime
2248 * of a public address, the lifetimes of
2249 * temporary addresses should be extended,
2250 * subject to the overall constraint that no
2251 * temporary addresses should ever remain
2252 * "valid" or "preferred" for a time longer than
2253 * (TEMP_VALID_LIFETIME) or
2254 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR),
2255 * respectively.
2256 */
2257 age = (now - ift->cstamp) / HZ;
2258 max_valid = in6_dev->cnf.temp_valid_lft - age;
2259 if (max_valid < 0)
2260 max_valid = 0;
2261
2262 max_prefered = in6_dev->cnf.temp_prefered_lft -
2263 in6_dev->cnf.max_desync_factor -
2264 age;
2265 if (max_prefered < 0)
2266 max_prefered = 0;
2267
2268 if (valid_lft > max_valid)
2269 valid_lft = max_valid;
2270
2271 if (prefered_lft > max_prefered)
2272 prefered_lft = max_prefered;
2273
1da177e4
LT		 2274 spin_lock(&ift->lock);
2275 flags = ift->flags;
76f793e3
LC		 2276 ift->valid_lft = valid_lft;
2277 ift->prefered_lft = prefered_lft;
2278 ift->tstamp = now;
2279 if (prefered_lft > 0)
2280 ift->flags &= ~IFA_F_DEPRECATED;
2281
1da177e4
LT		 2282 spin_unlock(&ift->lock);
2283 if (!(flags&IFA_F_TENTATIVE))
2284 ipv6_ifa_notify(0, ift);
2285 }
2286
aed65501 2287 if ((create || list_empty(&in6_dev->tempaddr_list)) && in6_dev->cnf.use_tempaddr > 0) {
1da177e4 2288 /*
76f793e3
LC		 2289 * When a new public address is created as
2290 * described in [ADDRCONF], also create a new
2291 * temporary address. Also create a temporary
2292 * address if it's enabled but no temporary
2293 * address currently exists.
1da177e4 2294 */
1ab1457c 2295 read_unlock_bh(&in6_dev->lock);
1da177e4
LT		 2296 ipv6_create_tempaddr(ifp, NULL);
2297 } else {
2298 read_unlock_bh(&in6_dev->lock);
2299 }
2300#endif
2301 in6_ifa_put(ifp);
2302 addrconf_verify(0);
2303 }
2304 }
2305 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
2306 in6_dev_put(in6_dev);
2307}
2308
2309/*
2310 * Set destination address.
2311 * Special case for SIT interfaces where we create a new "virtual"
2312 * device.
2313 */
af284937 2314int addrconf_set_dstaddr(struct net *net, void __user *arg)
1da177e4
LT		 2315{
2316 struct in6_ifreq ireq;
2317 struct net_device *dev;
2318 int err = -EINVAL;
2319
2320 rtnl_lock();
2321
2322 err = -EFAULT;
2323 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2324 goto err_exit;
2325
af284937 2326 dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
1da177e4
LT		 2327
2328 err = -ENODEV;
2329 if (dev == NULL)
2330 goto err_exit;
2331
07a93626 2332#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4 2333 if (dev->type == ARPHRD_SIT) {
5bc3eb7e 2334 const struct net_device_ops *ops = dev->netdev_ops;
1da177e4 2335 struct ifreq ifr;
1da177e4
LT		 2336 struct ip_tunnel_parm p;
2337
2338 err = -EADDRNOTAVAIL;
2339 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2340 goto err_exit;
2341
2342 memset(&p, 0, sizeof(p));
2343 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2344 p.iph.saddr = 0;
2345 p.iph.version = 4;
2346 p.iph.ihl = 5;
2347 p.iph.protocol = IPPROTO_IPV6;
2348 p.iph.ttl = 64;
d20b3109 2349 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
1da177e4 2350
5bc3eb7e
SH		 2351 if (ops->ndo_do_ioctl) {
2352 mm_segment_t oldfs = get_fs();
2353
2354 set_fs(KERNEL_DS);
2355 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2356 set_fs(oldfs);
2357 } else
2358 err = -EOPNOTSUPP;
1da177e4
LT		 2359
2360 if (err == 0) {
2361 err = -ENOBUFS;
af284937
DL		 2362 dev = __dev_get_by_name(net, p.name);
2363 if (!dev)
1da177e4
LT		 2364 goto err_exit;
2365 err = dev_open(dev);
2366 }
2367 }
0be669bb 2368#endif
1da177e4
LT		 2369
2370err_exit:
2371 rtnl_unlock();
2372 return err;
2373}
2374
2375/*
2376 * Manual configuration of address on an interface
2377 */
b71d1d42 2378static int inet6_addr_add(struct net *net, int ifindex, const struct in6_addr *pfx,
24ef0da7 2379 unsigned int plen, __u8 ifa_flags, __u32 prefered_lft,
af284937 2380 __u32 valid_lft)
1da177e4
LT		 2381{
2382 struct inet6_ifaddr *ifp;
2383 struct inet6_dev *idev;
2384 struct net_device *dev;
2385 int scope;
6f704992
YH		 2386 u32 flags;
2387 clock_t expires;
4bed72e4 2388 unsigned long timeout;
1da177e4
LT		 2389
2390 ASSERT_RTNL();
1ab1457c 2391
24ef0da7
TG		 2392 if (plen > 128)
2393 return -EINVAL;
2394
0778769d
NT		 2395 /* check the lifetime */
2396 if (!valid_lft || prefered_lft > valid_lft)
2397 return -EINVAL;
2398
af284937
DL		 2399 dev = __dev_get_by_index(net, ifindex);
2400 if (!dev)
1da177e4 2401 return -ENODEV;
1ab1457c 2402
64e724f6
BH		 2403 idev = addrconf_add_dev(dev);
2404 if (IS_ERR(idev))
2405 return PTR_ERR(idev);
1da177e4
LT		 2406
2407 scope = ipv6_addr_scope(pfx);
2408
4bed72e4
YH		 2409 timeout = addrconf_timeout_fixup(valid_lft, HZ);
2410 if (addrconf_finite_timeout(timeout)) {
2411 expires = jiffies_to_clock_t(timeout * HZ);
2412 valid_lft = timeout;
6f704992 2413 flags = RTF_EXPIRES;
4bed72e4
YH		 2414 } else {
2415 expires = 0;
2416 flags = 0;
2417 ifa_flags |= IFA_F_PERMANENT;
6f704992 2418 }
0778769d 2419
4bed72e4
YH		 2420 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
2421 if (addrconf_finite_timeout(timeout)) {
2422 if (timeout == 0)
2423 ifa_flags |= IFA_F_DEPRECATED;
2424 prefered_lft = timeout;
2425 }
0778769d
NT		 2426
2427 ifp = ipv6_add_addr(idev, pfx, plen, scope, ifa_flags);
2428
1da177e4 2429 if (!IS_ERR(ifp)) {
06aebfb7 2430 spin_lock_bh(&ifp->lock);
0778769d
NT		 2431 ifp->valid_lft = valid_lft;
2432 ifp->prefered_lft = prefered_lft;
2433 ifp->tstamp = jiffies;
06aebfb7 2434 spin_unlock_bh(&ifp->lock);
0778769d 2435
46d48046 2436 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
6f704992 2437 expires, flags);
95c385b4
NH		 2438 /*
2439 * Note that section 3.1 of RFC 4429 indicates
2440 * that the Optimistic flag should not be set for
2441 * manually configured addresses
2442 */
cf22f9a2 2443 addrconf_dad_start(ifp);
1da177e4 2444 in6_ifa_put(ifp);
0778769d 2445 addrconf_verify(0);
1da177e4
LT		 2446 return 0;
2447 }
2448
2449 return PTR_ERR(ifp);
2450}
2451
b71d1d42 2452static int inet6_addr_del(struct net *net, int ifindex, const struct in6_addr *pfx,
24ef0da7 2453 unsigned int plen)
1da177e4
LT		 2454{
2455 struct inet6_ifaddr *ifp;
2456 struct inet6_dev *idev;
2457 struct net_device *dev;
1ab1457c 2458
24ef0da7
TG		 2459 if (plen > 128)
2460 return -EINVAL;
2461
af284937
DL		 2462 dev = __dev_get_by_index(net, ifindex);
2463 if (!dev)
1da177e4
LT		 2464 return -ENODEV;
2465
2466 if ((idev = __in6_dev_get(dev)) == NULL)
2467 return -ENXIO;
2468
2469 read_lock_bh(&idev->lock);
502a2ffd 2470 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1da177e4
LT		 2471 if (ifp->prefix_len == plen &&
2472 ipv6_addr_equal(pfx, &ifp->addr)) {
2473 in6_ifa_hold(ifp);
2474 read_unlock_bh(&idev->lock);
1ab1457c 2475
1da177e4
LT		 2476 ipv6_del_addr(ifp);
2477
2478 /* If the last address is deleted administratively,
2479 disable IPv6 on this interface.
2480 */
502a2ffd 2481 if (list_empty(&idev->addr_list))
1da177e4
LT		 2482 addrconf_ifdown(idev->dev, 1);
2483 return 0;
2484 }
2485 }
2486 read_unlock_bh(&idev->lock);
2487 return -EADDRNOTAVAIL;
2488}
2489
2490
af284937 2491int addrconf_add_ifaddr(struct net *net, void __user *arg)
1da177e4
LT		 2492{
2493 struct in6_ifreq ireq;
2494 int err;
1ab1457c 2495
af31f412 2496 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1da177e4 2497 return -EPERM;
1ab1457c 2498
1da177e4
LT		 2499 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2500 return -EFAULT;
2501
2502 rtnl_lock();
af284937
DL		 2503 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2504 ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2505 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
1da177e4
LT		 2506 rtnl_unlock();
2507 return err;
2508}
2509
af284937 2510int addrconf_del_ifaddr(struct net *net, void __user *arg)
1da177e4
LT		 2511{
2512 struct in6_ifreq ireq;
2513 int err;
1ab1457c 2514
af31f412 2515 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1da177e4
LT		 2516 return -EPERM;
2517
2518 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2519 return -EFAULT;
2520
2521 rtnl_lock();
af284937
DL		 2522 err = inet6_addr_del(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2523 ireq.ifr6_prefixlen);
1da177e4
LT		 2524 rtnl_unlock();
2525 return err;
2526}
2527
b5f348e5
IJ		 2528static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
2529 int plen, int scope)
2530{
2531 struct inet6_ifaddr *ifp;
2532
2533 ifp = ipv6_add_addr(idev, addr, plen, scope, IFA_F_PERMANENT);
2534 if (!IS_ERR(ifp)) {
2535 spin_lock_bh(&ifp->lock);
2536 ifp->flags &= ~IFA_F_TENTATIVE;
2537 spin_unlock_bh(&ifp->lock);
2538 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2539 in6_ifa_put(ifp);
2540 }
2541}
2542
07a93626 2543#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4
LT		 2544static void sit_add_v4_addrs(struct inet6_dev *idev)
2545{
1da177e4
LT		 2546 struct in6_addr addr;
2547 struct net_device *dev;
c346dca1 2548 struct net *net = dev_net(idev->dev);
1da177e4
LT		 2549 int scope;
2550
2551 ASSERT_RTNL();
2552
2553 memset(&addr, 0, sizeof(struct in6_addr));
2554 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2555
2556 if (idev->dev->flags&IFF_POINTOPOINT) {
2557 addr.s6_addr32[0] = htonl(0xfe800000);
2558 scope = IFA_LINK;
2559 } else {
2560 scope = IPV6_ADDR_COMPATv4;
2561 }
2562
2563 if (addr.s6_addr32[3]) {
b5f348e5 2564 add_addr(idev, &addr, 128, scope);
1da177e4
LT		 2565 return;
2566 }
2567
6fda7350 2568 for_each_netdev(net, dev) {
8e5e8f30 2569 struct in_device *in_dev = __in_dev_get_rtnl(dev);
1da177e4 2570 if (in_dev && (dev->flags & IFF_UP)) {
8e5e8f30 2571 struct in_ifaddr *ifa;
1da177e4
LT		 2572
2573 int flag = scope;
2574
2575 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2576 int plen;
2577
2578 addr.s6_addr32[3] = ifa->ifa_local;
2579
2580 if (ifa->ifa_scope == RT_SCOPE_LINK)
2581 continue;
2582 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2583 if (idev->dev->flags&IFF_POINTOPOINT)
2584 continue;
2585 flag |= IFA_HOST;
2586 }
2587 if (idev->dev->flags&IFF_POINTOPOINT)
2588 plen = 64;
2589 else
2590 plen = 96;
2591
b5f348e5 2592 add_addr(idev, &addr, plen, flag);
1da177e4
LT		 2593 }
2594 }
1ab1457c 2595 }
1da177e4 2596}
0be669bb 2597#endif
1da177e4
LT		 2598
2599static void init_loopback(struct net_device *dev)
2600{
2601 struct inet6_dev *idev;
1da177e4
LT		 2602
2603 /* ::1 */
2604
2605 ASSERT_RTNL();
2606
2607 if ((idev = ipv6_find_idev(dev)) == NULL) {
91df42be 2608 pr_debug("%s: add_dev failed\n", __func__);
1da177e4
LT		 2609 return;
2610 }
2611
b5f348e5 2612 add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
1da177e4
LT		 2613}
2614
b71d1d42 2615static void addrconf_add_linklocal(struct inet6_dev *idev, const struct in6_addr *addr)
1da177e4 2616{
8e5e8f30 2617 struct inet6_ifaddr *ifp;
95c385b4
NH		 2618 u32 addr_flags = IFA_F_PERMANENT;
2619
2620#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2621 if (idev->cnf.optimistic_dad &&
702beb87 2622 !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
95c385b4
NH		 2623 addr_flags |= IFA_F_OPTIMISTIC;
2624#endif
1da177e4 2625
95c385b4
NH		 2626
2627 ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, addr_flags);
1da177e4 2628 if (!IS_ERR(ifp)) {
46d48046 2629 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
cf22f9a2 2630 addrconf_dad_start(ifp);
1da177e4
LT		 2631 in6_ifa_put(ifp);
2632 }
2633}
2634
2635static void addrconf_dev_config(struct net_device *dev)
2636{
2637 struct in6_addr addr;
8e5e8f30 2638 struct inet6_dev *idev;
1da177e4
LT		 2639
2640 ASSERT_RTNL();
2641
74235a25
HX		 2642 if ((dev->type != ARPHRD_ETHER) &&
2643 (dev->type != ARPHRD_FDDI) &&
74235a25 2644 (dev->type != ARPHRD_ARCNET) &&
06a4c1c5 2645 (dev->type != ARPHRD_INFINIBAND) &&
2646 (dev->type != ARPHRD_IEEE802154)) {
74235a25
HX		 2647 /* Alas, we support only Ethernet autoconfiguration. */
2648 return;
2649 }
2650
1da177e4 2651 idev = addrconf_add_dev(dev);
64e724f6 2652 if (IS_ERR(idev))
1da177e4
LT		 2653 return;
2654
2655 memset(&addr, 0, sizeof(struct in6_addr));
2656 addr.s6_addr32[0] = htonl(0xFE800000);
2657
2658 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
2659 addrconf_add_linklocal(idev, &addr);
2660}
2661
07a93626 2662#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4
LT		 2663static void addrconf_sit_config(struct net_device *dev)
2664{
2665 struct inet6_dev *idev;
2666
2667 ASSERT_RTNL();
2668
1ab1457c
YH		 2669 /*
2670 * Configure the tunnel with one of our IPv4
2671 * addresses... we should configure all of
1da177e4
LT		 2672 * our v4 addrs in the tunnel
2673 */
2674
2675 if ((idev = ipv6_find_idev(dev)) == NULL) {
91df42be 2676 pr_debug("%s: add_dev failed\n", __func__);
1da177e4
LT		 2677 return;
2678 }
2679
c7dc89c0
FT		 2680 if (dev->priv_flags & IFF_ISATAP) {
2681 struct in6_addr addr;
2682
2683 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
2684 addrconf_prefix_route(&addr, 64, dev, 0, 0);
2685 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2686 addrconf_add_linklocal(idev, &addr);
2687 return;
2688 }
2689
1da177e4
LT		 2690 sit_add_v4_addrs(idev);
2691
62b54dd9 2692 if (dev->flags&IFF_POINTOPOINT)
1da177e4 2693 addrconf_add_mroute(dev);
62b54dd9 2694 else
1da177e4
LT		 2695 sit_route_add(dev);
2696}
0be669bb 2697#endif
1da177e4 2698
07a93626 2699#if IS_ENABLED(CONFIG_NET_IPGRE)
aee80b54 2700static void addrconf_gre_config(struct net_device *dev)
2701{
2702 struct inet6_dev *idev;
2703 struct in6_addr addr;
2704
f3213831 2705 pr_info("%s(%s)\n", __func__, dev->name);
aee80b54 2706
2707 ASSERT_RTNL();
2708
2709 if ((idev = ipv6_find_idev(dev)) == NULL) {
91df42be 2710 pr_debug("%s: add_dev failed\n", __func__);
aee80b54 2711 return;
2712 }
2713
2714 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
2715 addrconf_prefix_route(&addr, 64, dev, 0, 0);
2716
2717 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2718 addrconf_add_linklocal(idev, &addr);
2719}
2720#endif
2721
1da177e4
LT		 2722static inline int
2723ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev)
2724{
2725 struct in6_addr lladdr;
2726
95c385b4 2727 if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) {
1da177e4
LT		 2728 addrconf_add_linklocal(idev, &lladdr);
2729 return 0;
2730 }
2731 return -1;
2732}
2733
2734static void ip6_tnl_add_linklocal(struct inet6_dev *idev)
2735{
2736 struct net_device *link_dev;
c346dca1 2737 struct net *net = dev_net(idev->dev);
1da177e4
LT		 2738
2739 /* first try to inherit the link-local address from the link device */
2740 if (idev->dev->iflink &&
6fda7350 2741 (link_dev = __dev_get_by_index(net, idev->dev->iflink))) {
1da177e4
LT		 2742 if (!ipv6_inherit_linklocal(idev, link_dev))
2743 return;
2744 }
2745 /* then try to inherit it from any device */
6fda7350 2746 for_each_netdev(net, link_dev) {
1da177e4
LT		 2747 if (!ipv6_inherit_linklocal(idev, link_dev))
2748 return;
2749 }
91df42be 2750 pr_debug("init ip6-ip6: add_linklocal failed\n");
1da177e4
LT		 2751}
2752
2753/*
2754 * Autoconfigure tunnel with a link-local address so routing protocols,
2755 * DHCPv6, MLD etc. can be run over the virtual link
2756 */
2757
2758static void addrconf_ip6_tnl_config(struct net_device *dev)
2759{
2760 struct inet6_dev *idev;
2761
2762 ASSERT_RTNL();
2763
e21e8467 2764 idev = addrconf_add_dev(dev);
64e724f6 2765 if (IS_ERR(idev)) {
91df42be 2766 pr_debug("init ip6-ip6: add_dev failed\n");
1da177e4
LT		 2767 return;
2768 }
2769 ip6_tnl_add_linklocal(idev);
1da177e4
LT		 2770}
2771
1ab1457c 2772static int addrconf_notify(struct notifier_block *this, unsigned long event,
8e5e8f30 2773 void *data)
1da177e4
LT		 2774{
2775 struct net_device *dev = (struct net_device *) data;
748e2d93 2776 struct inet6_dev *idev = __in6_dev_get(dev);
c5e33bdd 2777 int run_pending = 0;
b217d616 2778 int err;
1da177e4 2779
e21e8467 2780 switch (event) {
45ba9dd2 2781 case NETDEV_REGISTER:
74235a25 2782 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
45ba9dd2
YH		 2783 idev = ipv6_add_dev(dev);
2784 if (!idev)
b217d616 2785 return notifier_from_errno(-ENOMEM);
45ba9dd2
YH		 2786 }
2787 break;
bcdd553f 2788
1da177e4 2789 case NETDEV_UP:
3c21edbd 2790 case NETDEV_CHANGE:
c2edacf8
JV		 2791 if (dev->flags & IFF_SLAVE)
2792 break;
2793
3c21edbd 2794 if (event == NETDEV_UP) {
f24e3d65 2795 if (!addrconf_qdisc_ok(dev)) {
3c21edbd 2796 /* device is not ready yet. */
f3213831 2797 pr_info("ADDRCONF(NETDEV_UP): %s: link is not ready\n",
3c21edbd
YH		 2798 dev->name);
2799 break;
2800 }
99081049 2801
d31c7b8f
EP		 2802 if (!idev && dev->mtu >= IPV6_MIN_MTU)
2803 idev = ipv6_add_dev(dev);
2804
e3ec6cfc 2805 if (idev) {
99081049 2806 idev->if_flags |= IF_READY;
e3ec6cfc
BT		 2807 run_pending = 1;
2808 }
3c21edbd 2809 } else {
f24e3d65 2810 if (!addrconf_qdisc_ok(dev)) {
3c21edbd
YH		 2811 /* device is still not ready. */
2812 break;
2813 }
2814
2815 if (idev) {
bcdd553f 2816 if (idev->if_flags & IF_READY)
3c21edbd
YH		 2817 /* device is already configured. */
2818 break;
3c21edbd
YH		 2819 idev->if_flags |= IF_READY;
2820 }
2821
f3213831
JP		 2822 pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n",
2823 dev->name);
3c21edbd 2824
c5e33bdd 2825 run_pending = 1;
3c21edbd
YH		 2826 }
2827
e21e8467 2828 switch (dev->type) {
07a93626 2829#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4
LT		 2830 case ARPHRD_SIT:
2831 addrconf_sit_config(dev);
2832 break;
aee80b54 2833#endif
07a93626 2834#if IS_ENABLED(CONFIG_NET_IPGRE)
aee80b54 2835 case ARPHRD_IPGRE:
2836 addrconf_gre_config(dev);
2837 break;
0be669bb 2838#endif
1da177e4
LT		 2839 case ARPHRD_TUNNEL6:
2840 addrconf_ip6_tnl_config(dev);
2841 break;
2842 case ARPHRD_LOOPBACK:
2843 init_loopback(dev);
2844 break;
2845
2846 default:
2847 addrconf_dev_config(dev);
2848 break;
3ff50b79 2849 }
bcdd553f 2850
1da177e4 2851 if (idev) {
c5e33bdd
YH		 2852 if (run_pending)
2853 addrconf_dad_run(idev);
2854
bcdd553f
SH		 2855 /*
2856 * If the MTU changed during the interface down,
2857 * when the interface up, the changed MTU must be
2858 * reflected in the idev as well as routers.
1da177e4 2859 */
bcdd553f
SH		 2860 if (idev->cnf.mtu6 != dev->mtu &&
2861 dev->mtu >= IPV6_MIN_MTU) {
1da177e4
LT		 2862 rt6_mtu_change(dev, dev->mtu);
2863 idev->cnf.mtu6 = dev->mtu;
2864 }
2865 idev->tstamp = jiffies;
2866 inet6_ifinfo_notify(RTM_NEWLINK, idev);
bcdd553f
SH		 2867
2868 /*
2869 * If the changed mtu during down is lower than
2870 * IPV6_MIN_MTU stop IPv6 on this interface.
1da177e4
LT		 2871 */
2872 if (dev->mtu < IPV6_MIN_MTU)
bcdd553f 2873 addrconf_ifdown(dev, 1);
1da177e4
LT		 2874 }
2875 break;
2876
2877 case NETDEV_CHANGEMTU:
d31c7b8f 2878 if (idev && dev->mtu >= IPV6_MIN_MTU) {
1da177e4
LT		 2879 rt6_mtu_change(dev, dev->mtu);
2880 idev->cnf.mtu6 = dev->mtu;
2881 break;
2882 }
2883
d31c7b8f
EP		 2884 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2885 idev = ipv6_add_dev(dev);
2886 if (idev)
2887 break;
2888 }
2889
bcdd553f
SH		 2890 /*
2891 * MTU falled under IPV6_MIN_MTU.
2892 * Stop IPv6 on this interface.
2893 */
1da177e4
LT		 2894
2895 case NETDEV_DOWN:
2896 case NETDEV_UNREGISTER:
2897 /*
2898 * Remove all addresses from this interface.
2899 */
2900 addrconf_ifdown(dev, event != NETDEV_DOWN);
2901 break;
3c21edbd 2902
1da177e4 2903 case NETDEV_CHANGENAME:
1da177e4 2904 if (idev) {
5632c515 2905 snmp6_unregister_dev(idev);
408c4768 2906 addrconf_sysctl_unregister(idev);
f52295a9 2907 addrconf_sysctl_register(idev);
b217d616
HX		 2908 err = snmp6_register_dev(idev);
2909 if (err)
2910 return notifier_from_errno(err);
5632c515 2911 }
1da177e4 2912 break;
bcdd553f 2913
93d9b7d7
JP		 2914 case NETDEV_PRE_TYPE_CHANGE:
2915 case NETDEV_POST_TYPE_CHANGE:
2916 addrconf_type_change(dev, event);
75c78500 2917 break;
3ff50b79 2918 }
1da177e4
LT		 2919
2920 return NOTIFY_OK;
2921}
2922
2923/*
2924 * addrconf module should be notified of a device going up
2925 */
2926static struct notifier_block ipv6_dev_notf = {
2927 .notifier_call = addrconf_notify,
1da177e4
LT		 2928};
2929
93d9b7d7 2930static void addrconf_type_change(struct net_device *dev, unsigned long event)
75c78500
MS		 2931{
2932 struct inet6_dev *idev;
2933 ASSERT_RTNL();
2934
2935 idev = __in6_dev_get(dev);
2936
93d9b7d7 2937 if (event == NETDEV_POST_TYPE_CHANGE)
75c78500 2938 ipv6_mc_remap(idev);
93d9b7d7 2939 else if (event == NETDEV_PRE_TYPE_CHANGE)
75c78500
MS		 2940 ipv6_mc_unmap(idev);
2941}
2942
1da177e4
LT		 2943static int addrconf_ifdown(struct net_device *dev, int how)
2944{
c346dca1 2945 struct net *net = dev_net(dev);
502a2ffd 2946 struct inet6_dev *idev;
2947 struct inet6_ifaddr *ifa;
73a8bd74 2948 int state, i;
1da177e4
LT		 2949
2950 ASSERT_RTNL();
2951
73a8bd74
DM		 2952 rt6_ifdown(net, dev);
2953 neigh_ifdown(&nd_tbl, dev);
1da177e4
LT		 2954
2955 idev = __in6_dev_get(dev);
2956 if (idev == NULL)
2957 return -ENODEV;
2958
bcdd553f
SH		 2959 /*
2960 * Step 1: remove reference to ipv6 device from parent device.
2961 * Do not dev_put!
1da177e4 2962 */
439e2385 2963 if (how) {
1da177e4 2964 idev->dead = 1;
8814c4b5
YH		 2965
2966 /* protected by rtnl_lock */
a9b3cd7f 2967 RCU_INIT_POINTER(dev->ip6_ptr, NULL);
1da177e4
LT		 2968
2969 /* Step 1.5: remove snmp6 entry */
2970 snmp6_unregister_dev(idev);
2971
2972 }
2973
73a8bd74
DM		 2974 /* Step 2: clear hash table */
2975 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
2976 struct hlist_head *h = &inet6_addr_lst[i];
73a8bd74
DM		 2977
2978 spin_lock_bh(&addrconf_hash_lock);
2979 restart:
b67bfe0d 2980 hlist_for_each_entry_rcu(ifa, h, addr_lst) {
73a8bd74
DM		 2981 if (ifa->idev == idev) {
2982 hlist_del_init_rcu(&ifa->addr_lst);
2983 addrconf_del_timer(ifa);
2984 goto restart;
2985 }
2986 }
2987 spin_unlock_bh(&addrconf_hash_lock);
2988 }
2989
1da177e4
LT		 2990 write_lock_bh(&idev->lock);
2991
bcdd553f 2992 /* Step 2: clear flags for stateless addrconf */
439e2385 2993 if (!how)
3c21edbd 2994 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
1da177e4 2995
1da177e4 2996#ifdef CONFIG_IPV6_PRIVACY
439e2385 2997 if (how && del_timer(&idev->regen_timer))
1da177e4
LT		 2998 in6_dev_put(idev);
2999
bcdd553f 3000 /* Step 3: clear tempaddr list */
372e6c8f 3001 while (!list_empty(&idev->tempaddr_list)) {
3002 ifa = list_first_entry(&idev->tempaddr_list,
3003 struct inet6_ifaddr, tmp_list);
3004 list_del(&ifa->tmp_list);
1da177e4
LT		 3005 write_unlock_bh(&idev->lock);
3006 spin_lock_bh(&ifa->lock);
3007
3008 if (ifa->ifpub) {
3009 in6_ifa_put(ifa->ifpub);
3010 ifa->ifpub = NULL;
3011 }
3012 spin_unlock_bh(&ifa->lock);
3013 in6_ifa_put(ifa);
3014 write_lock_bh(&idev->lock);
3015 }
3016#endif
8f37ada5 3017
502a2ffd 3018 while (!list_empty(&idev->addr_list)) {
3019 ifa = list_first_entry(&idev->addr_list,
3020 struct inet6_ifaddr, if_list);
84e8b803 3021 addrconf_del_timer(ifa);
3022
73a8bd74 3023 list_del(&ifa->if_list);
84e8b803 3024
73a8bd74 3025 write_unlock_bh(&idev->lock);
84e8b803 3026
73a8bd74
DM		 3027 spin_lock_bh(&ifa->state_lock);
3028 state = ifa->state;
3029 ifa->state = INET6_IFADDR_STATE_DEAD;
3030 spin_unlock_bh(&ifa->state_lock);
9d82ca98 3031
73a8bd74
DM		 3032 if (state != INET6_IFADDR_STATE_DEAD) {
3033 __ipv6_ifa_notify(RTM_DELADDR, ifa);
3034 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifa);
27bdb2ab 3035 }
73a8bd74 3036 in6_ifa_put(ifa);
8f37ada5 3037
73a8bd74
DM		 3038 write_lock_bh(&idev->lock);
3039 }
8f37ada5 3040
1da177e4
LT		 3041 write_unlock_bh(&idev->lock);
3042
3043 /* Step 5: Discard multicast list */
439e2385 3044 if (how)
1da177e4
LT		 3045 ipv6_mc_destroy_dev(idev);
3046 else
3047 ipv6_mc_down(idev);
3048
1da177e4 3049 idev->tstamp = jiffies;
1ab1457c 3050
bcdd553f 3051 /* Last: Shot the device (if unregistered) */
439e2385 3052 if (how) {
408c4768 3053 addrconf_sysctl_unregister(idev);
1da177e4
LT		 3054 neigh_parms_release(&nd_tbl, idev->nd_parms);
3055 neigh_ifdown(&nd_tbl, dev);
3056 in6_dev_put(idev);
3057 }
3058 return 0;
3059}
3060
3061static void addrconf_rs_timer(unsigned long data)
3062{
3063 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
5b2a1953 3064 struct inet6_dev *idev = ifp->idev;
1da177e4 3065
5b2a1953 3066 read_lock(&idev->lock);
3067 if (idev->dead || !(idev->if_flags & IF_READY))
1da177e4
LT		 3068 goto out;
3069
9ba2add3 3070 if (!ipv6_accept_ra(idev))
5b2a1953 3071 goto out;
3072
3073 /* Announcement received after solicitation was sent */
3074 if (idev->if_flags & IF_RA_RCVD)
1da177e4 3075 goto out;
1da177e4
LT		 3076
3077 spin_lock(&ifp->lock);
5b2a1953 3078 if (ifp->probes++ < idev->cnf.rtr_solicits) {
1da177e4
LT		 3079 /* The wait after the last probe can be shorter */
3080 addrconf_mod_timer(ifp, AC_RS,
5b2a1953 3081 (ifp->probes == idev->cnf.rtr_solicits) ?
3082 idev->cnf.rtr_solicit_delay :
3083 idev->cnf.rtr_solicit_interval);
1da177e4
LT		 3084 spin_unlock(&ifp->lock);
3085
5b2a1953 3086 ndisc_send_rs(idev->dev, &ifp->addr, &in6addr_linklocal_allrouters);
1da177e4
LT		 3087 } else {
3088 spin_unlock(&ifp->lock);
3089 /*
3090 * Note: we do not support deprecated "all on-link"
3091 * assumption any longer.
3092 */
91df42be 3093 pr_debug("%s: no IPv6 routers present\n", idev->dev->name);
1da177e4
LT		 3094 }
3095
3096out:
5b2a1953 3097 read_unlock(&idev->lock);
1da177e4
LT		 3098 in6_ifa_put(ifp);
3099}
3100
3101/*
3102 * Duplicate Address Detection
3103 */
3c21edbd
YH		 3104static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
3105{
3106 unsigned long rand_num;
3107 struct inet6_dev *idev = ifp->idev;
3108
95c385b4
NH		 3109 if (ifp->flags & IFA_F_OPTIMISTIC)
3110 rand_num = 0;
3111 else
3112 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1);
3113
3c21edbd
YH		 3114 ifp->probes = idev->cnf.dad_transmits;
3115 addrconf_mod_timer(ifp, AC_DAD, rand_num);
3116}
3117
cf22f9a2 3118static void addrconf_dad_start(struct inet6_ifaddr *ifp)
1da177e4
LT		 3119{
3120 struct inet6_dev *idev = ifp->idev;
3121 struct net_device *dev = idev->dev;
1da177e4
LT		 3122
3123 addrconf_join_solict(dev, &ifp->addr);
3124
1da177e4 3125 net_srandom(ifp->addr.s6_addr32[3]);
1da177e4
LT		 3126
3127 read_lock_bh(&idev->lock);
622ccdf1 3128 spin_lock(&ifp->lock);
e9d3e084 3129 if (ifp->state == INET6_IFADDR_STATE_DEAD)
1da177e4 3130 goto out;
1da177e4
LT		 3131
3132 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
1b34be74 3133 idev->cnf.accept_dad < 1 ||
55ebaef1
NT		 3134 !(ifp->flags&IFA_F_TENTATIVE) ||
3135 ifp->flags & IFA_F_NODAD) {
cc411d0b 3136 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
21809faf 3137 spin_unlock(&ifp->lock);
1da177e4
LT		 3138 read_unlock_bh(&idev->lock);
3139
3140 addrconf_dad_completed(ifp);
3141 return;
3142 }
3143
6732bade 3144 if (!(idev->if_flags & IF_READY)) {
21809faf 3145 spin_unlock(&ifp->lock);
6732bade 3146 read_unlock_bh(&idev->lock);
3c21edbd 3147 /*
590a9887 3148 * If the device is not ready:
3c21edbd
YH		 3149 * - keep it tentative if it is a permanent address.
3150 * - otherwise, kill it.
3151 */
3152 in6_ifa_hold(ifp);
cc411d0b 3153 addrconf_dad_stop(ifp, 0);
6732bade 3154 return;
3c21edbd 3155 }
95c385b4
NH		 3156
3157 /*
3158 * Optimistic nodes can start receiving
3159 * Frames right away
3160 */
e21e8467 3161 if (ifp->flags & IFA_F_OPTIMISTIC)
95c385b4
NH		 3162 ip6_ins_rt(ifp->rt);
3163
6732bade 3164 addrconf_dad_kick(ifp);
1da177e4 3165out:
622ccdf1 3166 spin_unlock(&ifp->lock);
1da177e4
LT		 3167 read_unlock_bh(&idev->lock);
3168}
3169
3170static void addrconf_dad_timer(unsigned long data)
3171{
3172 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
3173 struct inet6_dev *idev = ifp->idev;
1da177e4
LT		 3174 struct in6_addr mcaddr;
3175
f2344a13
HX		 3176 if (!ifp->probes && addrconf_dad_end(ifp))
3177 goto out;
3178
122e4519 3179 read_lock(&idev->lock);
3180 if (idev->dead || !(idev->if_flags & IF_READY)) {
3181 read_unlock(&idev->lock);
1da177e4
LT		 3182 goto out;
3183 }
21809faf 3184
3185 spin_lock(&ifp->lock);
622ccdf1
HX		 3186 if (ifp->state == INET6_IFADDR_STATE_DEAD) {
3187 spin_unlock(&ifp->lock);
3188 read_unlock(&idev->lock);
3189 goto out;
3190 }
3191
1da177e4
LT		 3192 if (ifp->probes == 0) {
3193 /*
3194 * DAD was successful
3195 */
3196
cc411d0b 3197 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
21809faf 3198 spin_unlock(&ifp->lock);
122e4519 3199 read_unlock(&idev->lock);
1da177e4
LT		 3200
3201 addrconf_dad_completed(ifp);
3202
3203 goto out;
3204 }
3205
3206 ifp->probes--;
3207 addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time);
21809faf 3208 spin_unlock(&ifp->lock);
122e4519 3209 read_unlock(&idev->lock);
1da177e4
LT		 3210
3211 /* send a neighbour solicitation for our addr */
1da177e4 3212 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
d7aabf22 3213 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &in6addr_any);
1da177e4
LT		 3214out:
3215 in6_ifa_put(ifp);
3216}
3217
3218static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
3219{
e21e8467 3220 struct net_device *dev = ifp->idev->dev;
1da177e4
LT		 3221
3222 /*
3223 * Configure the address for reception. Now it is valid.
3224 */
3225
3226 ipv6_ifa_notify(RTM_NEWADDR, ifp);
3227
026359bc
TA		 3228 /* If added prefix is link local and we are prepared to process
3229 router advertisements, start sending router solicitations.
1da177e4
LT		 3230 */
3231
aeaf6e9d 3232 if (ipv6_accept_ra(ifp->idev) &&
1da177e4
LT		 3233 ifp->idev->cnf.rtr_solicits > 0 &&
3234 (dev->flags&IFF_LOOPBACK) == 0 &&
3235 (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) {
1da177e4
LT		 3236 /*
3237 * If a host as already performed a random delay
3238 * [...] as part of DAD [...] there is no need
3239 * to delay again before sending the first RS
3240 */
f3ee4010 3241 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &in6addr_linklocal_allrouters);
1da177e4
LT		 3242
3243 spin_lock_bh(&ifp->lock);
3244 ifp->probes = 1;
3245 ifp->idev->if_flags |= IF_RS_SENT;
3246 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval);
3247 spin_unlock_bh(&ifp->lock);
3248 }
3249}
3250
e21e8467
SH		 3251static void addrconf_dad_run(struct inet6_dev *idev)
3252{
c5e33bdd
YH		 3253 struct inet6_ifaddr *ifp;
3254
3255 read_lock_bh(&idev->lock);
502a2ffd 3256 list_for_each_entry(ifp, &idev->addr_list, if_list) {
21809faf 3257 spin_lock(&ifp->lock);
f2344a13
HX		 3258 if (ifp->flags & IFA_F_TENTATIVE &&
3259 ifp->state == INET6_IFADDR_STATE_DAD)
3260 addrconf_dad_kick(ifp);
21809faf 3261 spin_unlock(&ifp->lock);
c5e33bdd
YH		 3262 }
3263 read_unlock_bh(&idev->lock);
3264}
3265
1da177e4
LT		 3266#ifdef CONFIG_PROC_FS
3267struct if6_iter_state {
3c40090a 3268 struct seq_net_private p;
1da177e4 3269 int bucket;
1d578303 3270 int offset;
1da177e4
LT		 3271};
3272
1d578303 3273static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos)
1da177e4
LT		 3274{
3275 struct inet6_ifaddr *ifa = NULL;
3276 struct if6_iter_state *state = seq->private;
1218854a 3277 struct net *net = seq_file_net(seq);
1d578303 3278 int p = 0;
1da177e4 3279
1d578303
MM		 3280 /* initial bucket if pos is 0 */
3281 if (pos == 0) {
3282 state->bucket = 0;
3283 state->offset = 0;
3284 }
3285
3286 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
b67bfe0d 3287 hlist_for_each_entry_rcu_bh(ifa, &inet6_addr_lst[state->bucket],
1d578303 3288 addr_lst) {
9f0d3c27
ED		 3289 if (!net_eq(dev_net(ifa->idev->dev), net))
3290 continue;
1d578303
MM		 3291 /* sync with offset */
3292 if (p < state->offset) {
3293 p++;
3294 continue;
3295 }
3296 state->offset++;
9f0d3c27 3297 return ifa;
1d578303
MM		 3298 }
3299
3300 /* prepare for next bucket */
3301 state->offset = 0;
3302 p = 0;
1da177e4 3303 }
c2e21293 3304 return NULL;
1da177e4
LT		 3305}
3306
c2e21293 3307static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
3308 struct inet6_ifaddr *ifa)
1da177e4
LT		 3309{
3310 struct if6_iter_state *state = seq->private;
1218854a 3311 struct net *net = seq_file_net(seq);
1da177e4 3312
b67bfe0d 3313 hlist_for_each_entry_continue_rcu_bh(ifa, addr_lst) {
9f0d3c27
ED		 3314 if (!net_eq(dev_net(ifa->idev->dev), net))
3315 continue;
1d578303 3316 state->offset++;
9f0d3c27 3317 return ifa;
1d578303 3318 }
3c40090a 3319
c2e21293 3320 while (++state->bucket < IN6_ADDR_HSIZE) {
1d578303 3321 state->offset = 0;
b67bfe0d 3322 hlist_for_each_entry_rcu_bh(ifa,
c2e21293 3323 &inet6_addr_lst[state->bucket], addr_lst) {
9f0d3c27
ED		 3324 if (!net_eq(dev_net(ifa->idev->dev), net))
3325 continue;
1d578303 3326 state->offset++;
9f0d3c27 3327 return ifa;
c2e21293 3328 }
1da177e4 3329 }
3c40090a 3330
c2e21293 3331 return NULL;
1da177e4
LT		 3332}
3333
1da177e4 3334static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
4f70ecca 3335 __acquires(rcu_bh)
1da177e4 3336{
5c578aed 3337 rcu_read_lock_bh();
1d578303 3338 return if6_get_first(seq, *pos);
1da177e4
LT		 3339}
3340
3341static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3342{
3343 struct inet6_ifaddr *ifa;
3344
3345 ifa = if6_get_next(seq, v);
3346 ++*pos;
3347 return ifa;
3348}
3349
3350static void if6_seq_stop(struct seq_file *seq, void *v)
4f70ecca 3351 __releases(rcu_bh)
1da177e4 3352{
5c578aed 3353 rcu_read_unlock_bh();
1da177e4
LT		 3354}
3355
3356static int if6_seq_show(struct seq_file *seq, void *v)
3357{
3358 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
4b7a4274 3359 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
b071195d 3360 &ifp->addr,
1da177e4
LT		 3361 ifp->idev->dev->ifindex,
3362 ifp->prefix_len,
3363 ifp->scope,
3364 ifp->flags,
3365 ifp->idev->dev->name);
3366 return 0;
3367}
3368
56b3d975 3369static const struct seq_operations if6_seq_ops = {
1da177e4
LT		 3370 .start = if6_seq_start,
3371 .next = if6_seq_next,
3372 .show = if6_seq_show,
3373 .stop = if6_seq_stop,
3374};
3375
3376static int if6_seq_open(struct inode *inode, struct file *file)
3377{
3c40090a
DL		 3378 return seq_open_net(inode, file, &if6_seq_ops,
3379 sizeof(struct if6_iter_state));
1da177e4
LT		 3380}
3381
9a32144e 3382static const struct file_operations if6_fops = {
1da177e4
LT		 3383 .owner = THIS_MODULE,
3384 .open = if6_seq_open,
3385 .read = seq_read,
3386 .llseek = seq_lseek,
3c40090a 3387 .release = seq_release_net,
1da177e4
LT		 3388};
3389
2c8c1e72 3390static int __net_init if6_proc_net_init(struct net *net)
1da177e4 3391{
d4beaa66 3392 if (!proc_create("if_inet6", S_IRUGO, net->proc_net, &if6_fops))
1da177e4
LT		 3393 return -ENOMEM;
3394 return 0;
3395}
3396
2c8c1e72 3397static void __net_exit if6_proc_net_exit(struct net *net)
3c40090a 3398{
ece31ffd 3399 remove_proc_entry("if_inet6", net->proc_net);
3c40090a
DL		 3400}
3401
3402static struct pernet_operations if6_proc_net_ops = {
3403 .init = if6_proc_net_init,
3404 .exit = if6_proc_net_exit,
3405};
3406
3407int __init if6_proc_init(void)
3408{
3409 return register_pernet_subsys(&if6_proc_net_ops);
3410}
3411
1da177e4
LT		 3412void if6_proc_exit(void)
3413{
3c40090a 3414 unregister_pernet_subsys(&if6_proc_net_ops);
1da177e4
LT		 3415}
3416#endif /* CONFIG_PROC_FS */
3417
07a93626 3418#if IS_ENABLED(CONFIG_IPV6_MIP6)
3b9f9a1c 3419/* Check if address is a home address configured on any interface. */
b71d1d42 3420int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr)
3b9f9a1c
NT		 3421{
3422 int ret = 0;
c2e21293 3423 struct inet6_ifaddr *ifp = NULL;
ddbe5032 3424 unsigned int hash = inet6_addr_hash(addr);
c2e21293 3425
5c578aed 3426 rcu_read_lock_bh();
b67bfe0d 3427 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
878628fb 3428 if (!net_eq(dev_net(ifp->idev->dev), net))
389f6612 3429 continue;
caad295f 3430 if (ipv6_addr_equal(&ifp->addr, addr) &&
3b9f9a1c
NT		 3431 (ifp->flags & IFA_F_HOMEADDRESS)) {
3432 ret = 1;
3433 break;
3434 }
3435 }
5c578aed 3436 rcu_read_unlock_bh();
3b9f9a1c
NT		 3437 return ret;
3438}
3439#endif
3440
1da177e4
LT		 3441/*
3442 * Periodic address status verification
3443 */
3444
3445static void addrconf_verify(unsigned long foo)
3446{
b2db7564 3447 unsigned long now, next, next_sec, next_sched;
1da177e4 3448 struct inet6_ifaddr *ifp;
1da177e4
LT		 3449 int i;
3450
5c578aed 3451 rcu_read_lock_bh();
3452 spin_lock(&addrconf_verify_lock);
1da177e4 3453 now = jiffies;
b2db7564 3454 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
1da177e4
LT		 3455
3456 del_timer(&addr_chk_timer);
3457
bcdd553f 3458 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
1da177e4 3459restart:
b67bfe0d 3460 hlist_for_each_entry_rcu_bh(ifp,
5c578aed 3461 &inet6_addr_lst[i], addr_lst) {
1da177e4 3462 unsigned long age;
1da177e4
LT		 3463
3464 if (ifp->flags & IFA_F_PERMANENT)
3465 continue;
3466
3467 spin_lock(&ifp->lock);
b2db7564
YH		 3468 /* We try to batch several events at once. */
3469 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
1da177e4 3470
8f27ebb9
YH		 3471 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
3472 age >= ifp->valid_lft) {
1da177e4
LT		 3473 spin_unlock(&ifp->lock);
3474 in6_ifa_hold(ifp);
1da177e4
LT		 3475 ipv6_del_addr(ifp);
3476 goto restart;
8f27ebb9
YH		 3477 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
3478 spin_unlock(&ifp->lock);
3479 continue;
1da177e4 3480 } else if (age >= ifp->prefered_lft) {
a1ed0526 3481 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
1da177e4
LT		 3482 int deprecate = 0;
3483
3484 if (!(ifp->flags&IFA_F_DEPRECATED)) {
3485 deprecate = 1;
3486 ifp->flags |= IFA_F_DEPRECATED;
3487 }
3488
3489 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))
3490 next = ifp->tstamp + ifp->valid_lft * HZ;
3491
3492 spin_unlock(&ifp->lock);
3493
3494 if (deprecate) {
3495 in6_ifa_hold(ifp);
1da177e4
LT		 3496
3497 ipv6_ifa_notify(0, ifp);
3498 in6_ifa_put(ifp);
3499 goto restart;
3500 }
3501#ifdef CONFIG_IPV6_PRIVACY
3502 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
3503 !(ifp->flags&IFA_F_TENTATIVE)) {
88949cf4 3504 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
3505 ifp->idev->cnf.dad_transmits *
3506 ifp->idev->nd_parms->retrans_time / HZ;
3507
1da177e4
LT		 3508 if (age >= ifp->prefered_lft - regen_advance) {
3509 struct inet6_ifaddr *ifpub = ifp->ifpub;
3510 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3511 next = ifp->tstamp + ifp->prefered_lft * HZ;
3512 if (!ifp->regen_count && ifpub) {
3513 ifp->regen_count++;
3514 in6_ifa_hold(ifp);
3515 in6_ifa_hold(ifpub);
3516 spin_unlock(&ifp->lock);
5c578aed 3517
291d809b
HY		 3518 spin_lock(&ifpub->lock);
3519 ifpub->regen_count = 0;
3520 spin_unlock(&ifpub->lock);
1da177e4
LT		 3521 ipv6_create_tempaddr(ifpub, ifp);
3522 in6_ifa_put(ifpub);
3523 in6_ifa_put(ifp);
3524 goto restart;
3525 }
3526 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
3527 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
3528 spin_unlock(&ifp->lock);
3529#endif
3530 } else {
3531 /* ifp->prefered_lft <= ifp->valid_lft */
3532 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3533 next = ifp->tstamp + ifp->prefered_lft * HZ;
3534 spin_unlock(&ifp->lock);
3535 }
3536 }
1da177e4
LT		 3537 }
3538
b2db7564
YH		 3539 next_sec = round_jiffies_up(next);
3540 next_sched = next;
3541
3542 /* If rounded timeout is accurate enough, accept it. */
3543 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
3544 next_sched = next_sec;
3545
3546 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
3547 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
3548 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
3549
3550 ADBG((KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
3551 now, next, next_sec, next_sched));
3552
3553 addr_chk_timer.expires = next_sched;
1da177e4 3554 add_timer(&addr_chk_timer);
5c578aed 3555 spin_unlock(&addrconf_verify_lock);
3556 rcu_read_unlock_bh();
1da177e4
LT		 3557}
3558
461d8837
TG		 3559static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local)
3560{
3561 struct in6_addr *pfx = NULL;
3562
3563 if (addr)
3564 pfx = nla_data(addr);
3565
3566 if (local) {
3567 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
3568 pfx = NULL;
3569 else
3570 pfx = nla_data(local);
3571 }
3572
3573 return pfx;
3574}
3575
ef7c79ed 3576static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
461d8837
TG		 3577 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
3578 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
3579 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
3580};
3581
1da177e4 3582static int
661d2967 3583inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh)
1da177e4 3584{
3b1e0a65 3585 struct net *net = sock_net(skb->sk);
b933f716
TG		 3586 struct ifaddrmsg *ifm;
3587 struct nlattr *tb[IFA_MAX+1];
1da177e4 3588 struct in6_addr *pfx;
b933f716 3589 int err;
1da177e4 3590
b933f716
TG		 3591 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3592 if (err < 0)
3593 return err;
3594
3595 ifm = nlmsg_data(nlh);
3596 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
1da177e4
LT		 3597 if (pfx == NULL)
3598 return -EINVAL;
3599
af284937 3600 return inet6_addr_del(net, ifm->ifa_index, pfx, ifm->ifa_prefixlen);
1da177e4
LT		 3601}
3602
55ebaef1
NT		 3603static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags,
3604 u32 prefered_lft, u32 valid_lft)
081bba5b 3605{
6f704992
YH		 3606 u32 flags;
3607 clock_t expires;
4bed72e4 3608 unsigned long timeout;
46d48046 3609
081bba5b
NT		 3610 if (!valid_lft || (prefered_lft > valid_lft))
3611 return -EINVAL;
3612
4bed72e4
YH		 3613 timeout = addrconf_timeout_fixup(valid_lft, HZ);
3614 if (addrconf_finite_timeout(timeout)) {
3615 expires = jiffies_to_clock_t(timeout * HZ);
3616 valid_lft = timeout;
6f704992 3617 flags = RTF_EXPIRES;
4bed72e4
YH		 3618 } else {
3619 expires = 0;
3620 flags = 0;
3621 ifa_flags |= IFA_F_PERMANENT;
6f704992 3622 }
081bba5b 3623
4bed72e4
YH		 3624 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
3625 if (addrconf_finite_timeout(timeout)) {
3626 if (timeout == 0)
3627 ifa_flags |= IFA_F_DEPRECATED;
3628 prefered_lft = timeout;
3629 }
081bba5b
NT		 3630
3631 spin_lock_bh(&ifp->lock);
3b9f9a1c 3632 ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags;
081bba5b
NT		 3633 ifp->tstamp = jiffies;
3634 ifp->valid_lft = valid_lft;
3635 ifp->prefered_lft = prefered_lft;
3636
3637 spin_unlock_bh(&ifp->lock);
3638 if (!(ifp->flags&IFA_F_TENTATIVE))
3639 ipv6_ifa_notify(0, ifp);
081bba5b 3640
46d48046 3641 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
6f704992 3642 expires, flags);
081bba5b
NT		 3643 addrconf_verify(0);
3644
3645 return 0;
3646}
3647
1da177e4 3648static int
661d2967 3649inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh)
1da177e4 3650{
3b1e0a65 3651 struct net *net = sock_net(skb->sk);
461d8837
TG		 3652 struct ifaddrmsg *ifm;
3653 struct nlattr *tb[IFA_MAX+1];
1da177e4 3654 struct in6_addr *pfx;
7198f8ce
TG		 3655 struct inet6_ifaddr *ifa;
3656 struct net_device *dev;
55ebaef1
NT		 3657 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
3658 u8 ifa_flags;
461d8837 3659 int err;
1da177e4 3660
461d8837
TG		 3661 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3662 if (err < 0)
3663 return err;
3664
3665 ifm = nlmsg_data(nlh);
3666 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
1da177e4
LT		 3667 if (pfx == NULL)
3668 return -EINVAL;
3669
461d8837 3670 if (tb[IFA_CACHEINFO]) {
0778769d 3671 struct ifa_cacheinfo *ci;
461d8837
TG		 3672
3673 ci = nla_data(tb[IFA_CACHEINFO]);
0778769d 3674 valid_lft = ci->ifa_valid;
461d8837
TG		 3675 preferred_lft = ci->ifa_prefered;
3676 } else {
3677 preferred_lft = INFINITY_LIFE_TIME;
3678 valid_lft = INFINITY_LIFE_TIME;
0778769d
NT		 3679 }
3680
af284937 3681 dev = __dev_get_by_index(net, ifm->ifa_index);
7198f8ce
TG		 3682 if (dev == NULL)
3683 return -ENODEV;
3684
55ebaef1 3685 /* We ignore other flags so far. */
3b9f9a1c 3686 ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS);
55ebaef1 3687
1cab3da6 3688 ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
7198f8ce
TG		 3689 if (ifa == NULL) {
3690 /*
3691 * It would be best to check for !NLM_F_CREATE here but
3692 * userspace alreay relies on not having to provide this.
3693 */
af284937
DL		 3694 return inet6_addr_add(net, ifm->ifa_index, pfx,
3695 ifm->ifa_prefixlen, ifa_flags,
3696 preferred_lft, valid_lft);
081bba5b
NT		 3697 }
3698
7198f8ce
TG		 3699 if (nlh->nlmsg_flags & NLM_F_EXCL ||
3700 !(nlh->nlmsg_flags & NLM_F_REPLACE))
3701 err = -EEXIST;
3702 else
55ebaef1 3703 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
7198f8ce
TG		 3704
3705 in6_ifa_put(ifa);
3706
3707 return err;
1da177e4
LT		 3708}
3709
101bb229
TG		 3710static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags,
3711 u8 scope, int ifindex)
3712{
3713 struct ifaddrmsg *ifm;
3714
3715 ifm = nlmsg_data(nlh);
3716 ifm->ifa_family = AF_INET6;
3717 ifm->ifa_prefixlen = prefixlen;
3718 ifm->ifa_flags = flags;
3719 ifm->ifa_scope = scope;
3720 ifm->ifa_index = ifindex;
3721}
3722
85486af0
TG		 3723static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
3724 unsigned long tstamp, u32 preferred, u32 valid)
3725{
3726 struct ifa_cacheinfo ci;
3727
18a31e1e
TG		 3728 ci.cstamp = cstamp_delta(cstamp);
3729 ci.tstamp = cstamp_delta(tstamp);
85486af0
TG		 3730 ci.ifa_prefered = preferred;
3731 ci.ifa_valid = valid;
3732
3733 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
3734}
3735
101bb229
TG		 3736static inline int rt_scope(int ifa_scope)
3737{
3738 if (ifa_scope & IFA_HOST)
3739 return RT_SCOPE_HOST;
3740 else if (ifa_scope & IFA_LINK)
3741 return RT_SCOPE_LINK;
3742 else if (ifa_scope & IFA_SITE)
3743 return RT_SCOPE_SITE;
3744 else
3745 return RT_SCOPE_UNIVERSE;
3746}
3747
0ab6803b
TG		 3748static inline int inet6_ifaddr_msgsize(void)
3749{
339bf98f
TG		 3750 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
3751 + nla_total_size(16) /* IFA_ADDRESS */
3752 + nla_total_size(sizeof(struct ifa_cacheinfo));
0ab6803b 3753}
c5396a31 3754
1da177e4 3755static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
15e47304 3756 u32 portid, u32 seq, int event, unsigned int flags)
1da177e4 3757{
1da177e4 3758 struct nlmsghdr *nlh;
85486af0 3759 u32 preferred, valid;
1da177e4 3760
15e47304 3761 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
0ab6803b 3762 if (nlh == NULL)
26932566 3763 return -EMSGSIZE;
0ab6803b 3764
101bb229
TG		 3765 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
3766 ifa->idev->dev->ifindex);
3767
1da177e4 3768 if (!(ifa->flags&IFA_F_PERMANENT)) {
85486af0
TG		 3769 preferred = ifa->prefered_lft;
3770 valid = ifa->valid_lft;
3771 if (preferred != INFINITY_LIFE_TIME) {
1da177e4 3772 long tval = (jiffies - ifa->tstamp)/HZ;
a1faa698
JR		 3773 if (preferred > tval)
3774 preferred -= tval;
3775 else
3776 preferred = 0;
f56619fc
BH		 3777 if (valid != INFINITY_LIFE_TIME) {
3778 if (valid > tval)
3779 valid -= tval;
3780 else
3781 valid = 0;
3782 }
1da177e4
LT		 3783 }
3784 } else {
85486af0
TG		 3785 preferred = INFINITY_LIFE_TIME;
3786 valid = INFINITY_LIFE_TIME;
3787 }
3788
0ab6803b 3789 if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0 ||
26932566
PM		 3790 put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) {
3791 nlmsg_cancel(skb, nlh);
3792 return -EMSGSIZE;
3793 }
1da177e4 3794
0ab6803b 3795 return nlmsg_end(skb, nlh);
1da177e4
LT		 3796}
3797
3798static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
15e47304 3799 u32 portid, u32 seq, int event, u16 flags)
1da177e4 3800{
1da177e4 3801 struct nlmsghdr *nlh;
101bb229
TG		 3802 u8 scope = RT_SCOPE_UNIVERSE;
3803 int ifindex = ifmca->idev->dev->ifindex;
3804
3805 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
3806 scope = RT_SCOPE_SITE;
1da177e4 3807
15e47304 3808 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
0ab6803b 3809 if (nlh == NULL)
26932566 3810 return -EMSGSIZE;
85486af0 3811
0ab6803b
TG		 3812 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3813 if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 ||
3814 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
26932566
PM		 3815 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3816 nlmsg_cancel(skb, nlh);
3817 return -EMSGSIZE;
3818 }
85486af0 3819
0ab6803b 3820 return nlmsg_end(skb, nlh);
1da177e4
LT		 3821}
3822
3823static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
15e47304 3824 u32 portid, u32 seq, int event, unsigned int flags)
1da177e4 3825{
1da177e4 3826 struct nlmsghdr *nlh;
101bb229
TG		 3827 u8 scope = RT_SCOPE_UNIVERSE;
3828 int ifindex = ifaca->aca_idev->dev->ifindex;
3829
3830 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
3831 scope = RT_SCOPE_SITE;
1da177e4 3832
15e47304 3833 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
0ab6803b 3834 if (nlh == NULL)
26932566 3835 return -EMSGSIZE;
85486af0 3836
0ab6803b
TG		 3837 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3838 if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 ||
3839 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
26932566
PM		 3840 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3841 nlmsg_cancel(skb, nlh);
3842 return -EMSGSIZE;
3843 }
1da177e4 3844
0ab6803b 3845 return nlmsg_end(skb, nlh);
1da177e4
LT		 3846}
3847
e21e8467 3848enum addr_type_t {
1da177e4
LT		 3849 UNICAST_ADDR,
3850 MULTICAST_ADDR,
3851 ANYCAST_ADDR,
3852};
3853
234b27c3
ED		 3854/* called with rcu_read_lock() */
3855static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
3856 struct netlink_callback *cb, enum addr_type_t type,
3857 int s_ip_idx, int *p_ip_idx)
3858{
234b27c3
ED		 3859 struct ifmcaddr6 *ifmca;
3860 struct ifacaddr6 *ifaca;
3861 int err = 1;
3862 int ip_idx = *p_ip_idx;
3863
3864 read_lock_bh(&idev->lock);
3865 switch (type) {
502a2ffd 3866 case UNICAST_ADDR: {
3867 struct inet6_ifaddr *ifa;
3868
234b27c3 3869 /* unicast address incl. temp addr */
502a2ffd 3870 list_for_each_entry(ifa, &idev->addr_list, if_list) {
3871 if (++ip_idx < s_ip_idx)
234b27c3
ED		 3872 continue;
3873 err = inet6_fill_ifaddr(skb, ifa,
15e47304 3874 NETLINK_CB(cb->skb).portid,
234b27c3
ED		 3875 cb->nlh->nlmsg_seq,
3876 RTM_NEWADDR,
3877 NLM_F_MULTI);
3878 if (err <= 0)
3879 break;
63998ac2 3880 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
234b27c3
ED		 3881 }
3882 break;
502a2ffd 3883 }
234b27c3
ED		 3884 case MULTICAST_ADDR:
3885 /* multicast address */
3886 for (ifmca = idev->mc_list; ifmca;
3887 ifmca = ifmca->next, ip_idx++) {
3888 if (ip_idx < s_ip_idx)
3889 continue;
3890 err = inet6_fill_ifmcaddr(skb, ifmca,
15e47304 3891 NETLINK_CB(cb->skb).portid,
234b27c3
ED		 3892 cb->nlh->nlmsg_seq,
3893 RTM_GETMULTICAST,
3894 NLM_F_MULTI);
3895 if (err <= 0)
3896 break;
3897 }
3898 break;
3899 case ANYCAST_ADDR:
3900 /* anycast address */
3901 for (ifaca = idev->ac_list; ifaca;
3902 ifaca = ifaca->aca_next, ip_idx++) {
3903 if (ip_idx < s_ip_idx)
3904 continue;
3905 err = inet6_fill_ifacaddr(skb, ifaca,
15e47304 3906 NETLINK_CB(cb->skb).portid,
234b27c3
ED		 3907 cb->nlh->nlmsg_seq,
3908 RTM_GETANYCAST,
3909 NLM_F_MULTI);
3910 if (err <= 0)
3911 break;
3912 }
3913 break;
3914 default:
3915 break;
3916 }
3917 read_unlock_bh(&idev->lock);
3918 *p_ip_idx = ip_idx;
3919 return err;
3920}
3921
1da177e4
LT		 3922static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
3923 enum addr_type_t type)
3924{
234b27c3
ED		 3925 struct net *net = sock_net(skb->sk);
3926 int h, s_h;
1da177e4
LT		 3927 int idx, ip_idx;
3928 int s_idx, s_ip_idx;
1da177e4 3929 struct net_device *dev;
234b27c3
ED		 3930 struct inet6_dev *idev;
3931 struct hlist_head *head;
1ab1457c 3932
234b27c3
ED		 3933 s_h = cb->args[0];
3934 s_idx = idx = cb->args[1];
3935 s_ip_idx = ip_idx = cb->args[2];
5d5619b4 3936
234b27c3 3937 rcu_read_lock();
63998ac2 3938 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ net->dev_base_seq;
234b27c3
ED		 3939 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
3940 idx = 0;
3941 head = &net->dev_index_head[h];
b67bfe0d 3942 hlist_for_each_entry_rcu(dev, head, index_hlist) {
234b27c3
ED		 3943 if (idx < s_idx)
3944 goto cont;
4b97efdf 3945 if (h > s_h || idx > s_idx)
234b27c3
ED		 3946 s_ip_idx = 0;
3947 ip_idx = 0;
e21e8467
SH		 3948 idev = __in6_dev_get(dev);
3949 if (!idev)
234b27c3
ED		 3950 goto cont;
3951
3952 if (in6_dump_addrs(idev, skb, cb, type,
3953 s_ip_idx, &ip_idx) <= 0)
3954 goto done;
7562f876 3955cont:
234b27c3
ED		 3956 idx++;
3957 }
1da177e4 3958 }
234b27c3
ED		 3959done:
3960 rcu_read_unlock();
3961 cb->args[0] = h;
3962 cb->args[1] = idx;
3963 cb->args[2] = ip_idx;
3964
1da177e4
LT		 3965 return skb->len;
3966}
3967
3968static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
3969{
3970 enum addr_type_t type = UNICAST_ADDR;
b854272b 3971
1da177e4
LT		 3972 return inet6_dump_addr(skb, cb, type);
3973}
3974
3975static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
3976{
3977 enum addr_type_t type = MULTICAST_ADDR;
b854272b 3978
1da177e4
LT		 3979 return inet6_dump_addr(skb, cb, type);
3980}
3981
3982
3983static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
3984{
3985 enum addr_type_t type = ANYCAST_ADDR;
b854272b 3986
1da177e4
LT		 3987 return inet6_dump_addr(skb, cb, type);
3988}
3989
661d2967 3990static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh)
6c223828 3991{
3b1e0a65 3992 struct net *net = sock_net(in_skb->sk);
1b29fc2c
TG		 3993 struct ifaddrmsg *ifm;
3994 struct nlattr *tb[IFA_MAX+1];
6c223828
NT		 3995 struct in6_addr *addr = NULL;
3996 struct net_device *dev = NULL;
3997 struct inet6_ifaddr *ifa;
3998 struct sk_buff *skb;
6c223828
NT		 3999 int err;
4000
1b29fc2c
TG		 4001 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
4002 if (err < 0)
4003 goto errout;
4004
4005 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
4006 if (addr == NULL) {
4007 err = -EINVAL;
4008 goto errout;
6c223828 4009 }
6c223828 4010
1b29fc2c 4011 ifm = nlmsg_data(nlh);
6c223828 4012 if (ifm->ifa_index)
6fda7350 4013 dev = __dev_get_by_index(net, ifm->ifa_index);
6c223828 4014
e21e8467
SH		 4015 ifa = ipv6_get_ifaddr(net, addr, dev, 1);
4016 if (!ifa) {
1b29fc2c
TG		 4017 err = -EADDRNOTAVAIL;
4018 goto errout;
4019 }
6c223828 4020
e21e8467
SH		 4021 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
4022 if (!skb) {
6c223828 4023 err = -ENOBUFS;
1b29fc2c 4024 goto errout_ifa;
6c223828
NT		 4025 }
4026
15e47304 4027 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).portid,
6c223828 4028 nlh->nlmsg_seq, RTM_NEWADDR, 0);
26932566
PM		 4029 if (err < 0) {
4030 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4031 WARN_ON(err == -EMSGSIZE);
4032 kfree_skb(skb);
4033 goto errout_ifa;
4034 }
15e47304 4035 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
1b29fc2c 4036errout_ifa:
6c223828 4037 in6_ifa_put(ifa);
1b29fc2c 4038errout:
6c223828 4039 return err;
6c223828
NT		 4040}
4041
1da177e4
LT		 4042static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
4043{
4044 struct sk_buff *skb;
c346dca1 4045 struct net *net = dev_net(ifa->idev->dev);
5d620266 4046 int err = -ENOBUFS;
1da177e4 4047
0ab6803b 4048 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
5d620266
TG		 4049 if (skb == NULL)
4050 goto errout;
4051
4052 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
26932566
PM		 4053 if (err < 0) {
4054 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4055 WARN_ON(err == -EMSGSIZE);
4056 kfree_skb(skb);
4057 goto errout;
4058 }
1ce85fe4
PNA		 4059 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
4060 return;
5d620266
TG		 4061errout:
4062 if (err < 0)
6fda7350 4063 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
1da177e4
LT		 4064}
4065
b6f99a21 4066static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
1da177e4
LT		 4067 __s32 *array, int bytes)
4068{
04561c1f
TG		 4069 BUG_ON(bytes < (DEVCONF_MAX * 4));
4070
1da177e4
LT		 4071 memset(array, 0, bytes);
4072 array[DEVCONF_FORWARDING] = cnf->forwarding;
4073 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
4074 array[DEVCONF_MTU6] = cnf->mtu6;
4075 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
4076 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
4077 array[DEVCONF_AUTOCONF] = cnf->autoconf;
4078 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
4079 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
93908d19
TG		 4080 array[DEVCONF_RTR_SOLICIT_INTERVAL] =
4081 jiffies_to_msecs(cnf->rtr_solicit_interval);
4082 array[DEVCONF_RTR_SOLICIT_DELAY] =
4083 jiffies_to_msecs(cnf->rtr_solicit_delay);
1da177e4
LT		 4084 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
4085#ifdef CONFIG_IPV6_PRIVACY
4086 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
4087 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
4088 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
4089 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
4090 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
4091#endif
4092 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
65f5c7c1 4093 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
c4fd30eb 4094 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
930d6ff2
YH		 4095#ifdef CONFIG_IPV6_ROUTER_PREF
4096 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
93908d19
TG		 4097 array[DEVCONF_RTR_PROBE_INTERVAL] =
4098 jiffies_to_msecs(cnf->rtr_probe_interval);
fa03ef38 4099#ifdef CONFIG_IPV6_ROUTE_INFO
09c884d4
YH		 4100 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
4101#endif
930d6ff2 4102#endif
fbea49e1 4103 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
0bcbc926 4104 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
95c385b4
NH		 4105#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4106 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
4107#endif
7bc570c8
YH		 4108#ifdef CONFIG_IPV6_MROUTE
4109 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
4110#endif
778d80be 4111 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
1b34be74 4112 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
c3faca05 4113 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
5cb04436 4114 array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify;
1da177e4
LT		 4115}
4116
b382b191
TG		 4117static inline size_t inet6_ifla6_size(void)
4118{
4119 return nla_total_size(4) /* IFLA_INET6_FLAGS */
4120 + nla_total_size(sizeof(struct ifla_cacheinfo))
4121 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
4122 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
4123 + nla_total_size(ICMP6_MIB_MAX * 8); /* IFLA_INET6_ICMP6STATS */
4124}
4125
339bf98f
TG		 4126static inline size_t inet6_if_nlmsg_size(void)
4127{
4128 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
4129 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
4130 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
4131 + nla_total_size(4) /* IFLA_MTU */
4132 + nla_total_size(4) /* IFLA_LINK */
b382b191 4133 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */
339bf98f 4134}
c5396a31 4135
be281e55 4136static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib,
7d720c3e 4137 int items, int bytes)
7f7d9a6b
HX		 4138{
4139 int i;
4140 int pad = bytes - sizeof(u64) * items;
4141 BUG_ON(pad < 0);
4142
4143 /* Use put_unaligned() because stats may not be aligned for u64. */
4144 put_unaligned(items, &stats[0]);
4145 for (i = 1; i < items; i++)
be281e55 4146 put_unaligned(atomic_long_read(&mib[i]), &stats[i]);
7f7d9a6b
HX		 4147
4148 memset(&stats[items], 0, pad);
4149}
4150
4ce3c183
ED		 4151static inline void __snmp6_fill_stats64(u64 *stats, void __percpu **mib,
4152 int items, int bytes, size_t syncpoff)
4153{
4154 int i;
4155 int pad = bytes - sizeof(u64) * items;
4156 BUG_ON(pad < 0);
4157
4158 /* Use put_unaligned() because stats may not be aligned for u64. */
4159 put_unaligned(items, &stats[0]);
4160 for (i = 1; i < items; i++)
4161 put_unaligned(snmp_fold_field64(mib, i, syncpoff), &stats[i]);
4162
4163 memset(&stats[items], 0, pad);
4164}
4165
7f7d9a6b
HX		 4166static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
4167 int bytes)
4168{
e21e8467 4169 switch (attrtype) {
7f7d9a6b 4170 case IFLA_INET6_STATS:
4ce3c183
ED		 4171 __snmp6_fill_stats64(stats, (void __percpu **)idev->stats.ipv6,
4172 IPSTATS_MIB_MAX, bytes, offsetof(struct ipstats_mib, syncp));
7f7d9a6b
HX		 4173 break;
4174 case IFLA_INET6_ICMP6STATS:
be281e55 4175 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, ICMP6_MIB_MAX, bytes);
7f7d9a6b
HX		 4176 break;
4177 }
4178}
4179
b382b191
TG		 4180static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev)
4181{
4182 struct nlattr *nla;
4183 struct ifla_cacheinfo ci;
4184
c78679e8
DM		 4185 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags))
4186 goto nla_put_failure;
b382b191 4187 ci.max_reasm_len = IPV6_MAXPLEN;
24912420
DM		 4188 ci.tstamp = cstamp_delta(idev->tstamp);
4189 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time);
4190 ci.retrans_time = jiffies_to_msecs(idev->nd_parms->retrans_time);
c78679e8
DM		 4191 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci))
4192 goto nla_put_failure;
b382b191
TG		 4193 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
4194 if (nla == NULL)
4195 goto nla_put_failure;
4196 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
4197
4198 /* XXX - MC not implemented */
4199
4200 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
4201 if (nla == NULL)
4202 goto nla_put_failure;
4203 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
4204
4205 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
4206 if (nla == NULL)
4207 goto nla_put_failure;
4208 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
4209
4210 return 0;
4211
4212nla_put_failure:
4213 return -EMSGSIZE;
4214}
4215
4216static size_t inet6_get_link_af_size(const struct net_device *dev)
4217{
4218 if (!__in6_dev_get(dev))
4219 return 0;
4220
4221 return inet6_ifla6_size();
4222}
4223
4224static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev)
4225{
4226 struct inet6_dev *idev = __in6_dev_get(dev);
4227
4228 if (!idev)
4229 return -ENODATA;
4230
4231 if (inet6_fill_ifla6_attrs(skb, idev) < 0)
4232 return -EMSGSIZE;
4233
4234 return 0;
4235}
4236
1ab1457c 4237static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
15e47304 4238 u32 portid, u32 seq, int event, unsigned int flags)
1da177e4 4239{
04561c1f 4240 struct net_device *dev = idev->dev;
04561c1f
TG		 4241 struct ifinfomsg *hdr;
4242 struct nlmsghdr *nlh;
4243 void *protoinfo;
04561c1f 4244
15e47304 4245 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags);
04561c1f 4246 if (nlh == NULL)
26932566 4247 return -EMSGSIZE;
04561c1f
TG		 4248
4249 hdr = nlmsg_data(nlh);
4250 hdr->ifi_family = AF_INET6;
4251 hdr->__ifi_pad = 0;
4252 hdr->ifi_type = dev->type;
4253 hdr->ifi_index = dev->ifindex;
4254 hdr->ifi_flags = dev_get_flags(dev);
4255 hdr->ifi_change = 0;
4256
c78679e8
DM		 4257 if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
4258 (dev->addr_len &&
4259 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
4260 nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
4261 (dev->ifindex != dev->iflink &&
4262 nla_put_u32(skb, IFLA_LINK, dev->iflink)))
4263 goto nla_put_failure;
04561c1f
TG		 4264 protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
4265 if (protoinfo == NULL)
4266 goto nla_put_failure;
1da177e4 4267
b382b191 4268 if (inet6_fill_ifla6_attrs(skb, idev) < 0)
bf99f1bd 4269 goto nla_put_failure;
1da177e4 4270
04561c1f
TG		 4271 nla_nest_end(skb, protoinfo);
4272 return nlmsg_end(skb, nlh);
1da177e4 4273
04561c1f 4274nla_put_failure:
26932566
PM		 4275 nlmsg_cancel(skb, nlh);
4276 return -EMSGSIZE;
1da177e4
LT		 4277}
4278
4279static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
4280{
3b1e0a65 4281 struct net *net = sock_net(skb->sk);
84d2697d 4282 int h, s_h;
434a8a58 4283 int idx = 0, s_idx;
1da177e4
LT		 4284 struct net_device *dev;
4285 struct inet6_dev *idev;
84d2697d 4286 struct hlist_head *head;
1da177e4 4287
84d2697d
ED		 4288 s_h = cb->args[0];
4289 s_idx = cb->args[1];
4290
4291 rcu_read_lock();
4292 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4293 idx = 0;
4294 head = &net->dev_index_head[h];
b67bfe0d 4295 hlist_for_each_entry_rcu(dev, head, index_hlist) {
84d2697d
ED		 4296 if (idx < s_idx)
4297 goto cont;
4298 idev = __in6_dev_get(dev);
4299 if (!idev)
4300 goto cont;
4301 if (inet6_fill_ifinfo(skb, idev,
15e47304 4302 NETLINK_CB(cb->skb).portid,
84d2697d
ED		 4303 cb->nlh->nlmsg_seq,
4304 RTM_NEWLINK, NLM_F_MULTI) <= 0)
4305 goto out;
7562f876 4306cont:
84d2697d
ED		 4307 idx++;
4308 }
1da177e4 4309 }
84d2697d
ED		 4310out:
4311 rcu_read_unlock();
4312 cb->args[1] = idx;
4313 cb->args[0] = h;
1da177e4
LT		 4314
4315 return skb->len;
4316}
4317
4318void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
4319{
4320 struct sk_buff *skb;
c346dca1 4321 struct net *net = dev_net(idev->dev);
8d7a76c9 4322 int err = -ENOBUFS;
1ab1457c 4323
339bf98f 4324 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
8d7a76c9
TG		 4325 if (skb == NULL)
4326 goto errout;
4327
4328 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
26932566
PM		 4329 if (err < 0) {
4330 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
4331 WARN_ON(err == -EMSGSIZE);
4332 kfree_skb(skb);
4333 goto errout;
4334 }
5f75a104 4335 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC);
1ce85fe4 4336 return;
8d7a76c9
TG		 4337errout:
4338 if (err < 0)
5f75a104 4339 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err);
1da177e4
LT		 4340}
4341
339bf98f
TG		 4342static inline size_t inet6_prefix_nlmsg_size(void)
4343{
4344 return NLMSG_ALIGN(sizeof(struct prefixmsg))
4345 + nla_total_size(sizeof(struct in6_addr))
4346 + nla_total_size(sizeof(struct prefix_cacheinfo));
4347}
c5396a31 4348
1da177e4 4349static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
15e47304 4350 struct prefix_info *pinfo, u32 portid, u32 seq,
6051e2f4 4351 int event, unsigned int flags)
1da177e4 4352{
6051e2f4
TG		 4353 struct prefixmsg *pmsg;
4354 struct nlmsghdr *nlh;
1da177e4
LT		 4355 struct prefix_cacheinfo ci;
4356
15e47304 4357 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags);
6051e2f4 4358 if (nlh == NULL)
26932566 4359 return -EMSGSIZE;
6051e2f4
TG		 4360
4361 pmsg = nlmsg_data(nlh);
1da177e4 4362 pmsg->prefix_family = AF_INET6;
8a47077a
PM		 4363 pmsg->prefix_pad1 = 0;
4364 pmsg->prefix_pad2 = 0;
1da177e4
LT		 4365 pmsg->prefix_ifindex = idev->dev->ifindex;
4366 pmsg->prefix_len = pinfo->prefix_len;
4367 pmsg->prefix_type = pinfo->type;
8a47077a 4368 pmsg->prefix_pad3 = 0;
1da177e4
LT		 4369 pmsg->prefix_flags = 0;
4370 if (pinfo->onlink)
4371 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
4372 if (pinfo->autoconf)
4373 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
4374
c78679e8
DM		 4375 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix))
4376 goto nla_put_failure;
1da177e4
LT		 4377 ci.preferred_time = ntohl(pinfo->prefered);
4378 ci.valid_time = ntohl(pinfo->valid);
c78679e8
DM		 4379 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci))
4380 goto nla_put_failure;
6051e2f4 4381 return nlmsg_end(skb, nlh);
1da177e4 4382
6051e2f4 4383nla_put_failure:
26932566
PM		 4384 nlmsg_cancel(skb, nlh);
4385 return -EMSGSIZE;
1da177e4
LT		 4386}
4387
1ab1457c 4388static void inet6_prefix_notify(int event, struct inet6_dev *idev,
1da177e4
LT		 4389 struct prefix_info *pinfo)
4390{
4391 struct sk_buff *skb;
c346dca1 4392 struct net *net = dev_net(idev->dev);
8c384bfa 4393 int err = -ENOBUFS;
1da177e4 4394
339bf98f 4395 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
8c384bfa
TG		 4396 if (skb == NULL)
4397 goto errout;
4398
4399 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
26932566
PM		 4400 if (err < 0) {
4401 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
4402 WARN_ON(err == -EMSGSIZE);
4403 kfree_skb(skb);
4404 goto errout;
4405 }
1ce85fe4
PNA		 4406 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
4407 return;
8c384bfa
TG		 4408errout:
4409 if (err < 0)
6fda7350 4410 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
1da177e4
LT		 4411}
4412
1da177e4
LT		 4413static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4414{
63998ac2
ND		 4415 struct net *net = dev_net(ifp->idev->dev);
4416
1da177e4
LT		 4417 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
4418
4419 switch (event) {
4420 case RTM_NEWADDR:
95c385b4
NH		 4421 /*
4422 * If the address was optimistic
4423 * we inserted the route at the start of
4424 * our DAD process, so we don't need
4425 * to do it again
4426 */
4427 if (!(ifp->rt->rt6i_node))
4428 ip6_ins_rt(ifp->rt);
1da177e4
LT		 4429 if (ifp->idev->cnf.forwarding)
4430 addrconf_join_anycast(ifp);
4431 break;
4432 case RTM_DELADDR:
4433 if (ifp->idev->cnf.forwarding)
4434 addrconf_leave_anycast(ifp);
4435 addrconf_leave_solict(ifp->idev, &ifp->addr);
d8d1f30b 4436 dst_hold(&ifp->rt->dst);
93fa159a 4437
73a8bd74 4438 if (ip6_del_rt(ifp->rt))
d8d1f30b 4439 dst_free(&ifp->rt->dst);
1da177e4
LT		 4440 break;
4441 }
63998ac2 4442 atomic_inc(&net->ipv6.dev_addr_genid);
1da177e4
LT		 4443}
4444
4445static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4446{
8814c4b5 4447 rcu_read_lock_bh();
1da177e4
LT		 4448 if (likely(ifp->idev->dead == 0))
4449 __ipv6_ifa_notify(event, ifp);
8814c4b5 4450 rcu_read_unlock_bh();
1da177e4
LT		 4451}
4452
4453#ifdef CONFIG_SYSCTL
4454
4455static
8d65af78 4456int addrconf_sysctl_forward(ctl_table *ctl, int write,
1da177e4
LT		 4457 void __user *buffer, size_t *lenp, loff_t *ppos)
4458{
4459 int *valp = ctl->data;
4460 int val = *valp;
88af182e 4461 loff_t pos = *ppos;
013d97e9 4462 ctl_table lctl;
1da177e4
LT		 4463 int ret;
4464
013d97e9
FR		 4465 /*
4466 * ctl->data points to idev->cnf.forwarding, we should
4467 * not modify it until we get the rtnl lock.
4468 */
4469 lctl = *ctl;
4470 lctl.data = &val;
4471
4472 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
1da177e4 4473
c8fecf22 4474 if (write)
b325fddb 4475 ret = addrconf_fixup_forwarding(ctl, valp, val);
88af182e
EB		 4476 if (ret)
4477 *ppos = pos;
1ab1457c 4478 return ret;
1da177e4
LT		 4479}
4480
56d417b1
BH		 4481static void dev_disable_change(struct inet6_dev *idev)
4482{
4483 if (!idev || !idev->dev)
4484 return;
4485
4486 if (idev->cnf.disable_ipv6)
4487 addrconf_notify(NULL, NETDEV_DOWN, idev->dev);
4488 else
4489 addrconf_notify(NULL, NETDEV_UP, idev->dev);
4490}
4491
4492static void addrconf_disable_change(struct net *net, __s32 newf)
4493{
4494 struct net_device *dev;
4495 struct inet6_dev *idev;
4496
c6d14c84
ED		 4497 rcu_read_lock();
4498 for_each_netdev_rcu(net, dev) {
56d417b1
BH		 4499 idev = __in6_dev_get(dev);
4500 if (idev) {
4501 int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
4502 idev->cnf.disable_ipv6 = newf;
4503 if (changed)
4504 dev_disable_change(idev);
4505 }
56d417b1 4506 }
c6d14c84 4507 rcu_read_unlock();
56d417b1
BH		 4508}
4509
013d97e9 4510static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf)
56d417b1
BH		 4511{
4512 struct net *net;
013d97e9
FR		 4513 int old;
4514
4515 if (!rtnl_trylock())
4516 return restart_syscall();
56d417b1
BH		 4517
4518 net = (struct net *)table->extra2;
013d97e9
FR		 4519 old = *p;
4520 *p = newf;
56d417b1 4521
013d97e9
FR		 4522 if (p == &net->ipv6.devconf_dflt->disable_ipv6) {
4523 rtnl_unlock();
56d417b1 4524 return 0;
88af182e 4525 }
56d417b1
BH		 4526
4527 if (p == &net->ipv6.devconf_all->disable_ipv6) {
56d417b1
BH		 4528 net->ipv6.devconf_dflt->disable_ipv6 = newf;
4529 addrconf_disable_change(net, newf);
013d97e9 4530 } else if ((!newf) ^ (!old))
56d417b1
BH		 4531 dev_disable_change((struct inet6_dev *)table->extra1);
4532
4533 rtnl_unlock();
4534 return 0;
4535}
4536
4537static
8d65af78 4538int addrconf_sysctl_disable(ctl_table *ctl, int write,
56d417b1
BH		 4539 void __user *buffer, size_t *lenp, loff_t *ppos)
4540{
4541 int *valp = ctl->data;
4542 int val = *valp;
88af182e 4543 loff_t pos = *ppos;
013d97e9 4544 ctl_table lctl;
56d417b1
BH		 4545 int ret;
4546
013d97e9
FR		 4547 /*
4548 * ctl->data points to idev->cnf.disable_ipv6, we should
4549 * not modify it until we get the rtnl lock.
4550 */
4551 lctl = *ctl;
4552 lctl.data = &val;
4553
4554 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
56d417b1
BH		 4555
4556 if (write)
4557 ret = addrconf_disable_ipv6(ctl, valp, val);
88af182e
EB		 4558 if (ret)
4559 *ppos = pos;
56d417b1
BH		 4560 return ret;
4561}
4562
1da177e4
LT		 4563static struct addrconf_sysctl_table
4564{
4565 struct ctl_table_header *sysctl_header;
f6a07b29 4566 ctl_table addrconf_vars[DEVCONF_MAX+1];
ab32ea5d 4567} addrconf_sysctl __read_mostly = {
1da177e4
LT		 4568 .sysctl_header = NULL,
4569 .addrconf_vars = {
1ab1457c 4570 {
e21e8467
SH		 4571 .procname = "forwarding",
4572 .data = &ipv6_devconf.forwarding,
4573 .maxlen = sizeof(int),
4574 .mode = 0644,
4575 .proc_handler = addrconf_sysctl_forward,
1da177e4
LT		 4576 },
4577 {
e21e8467
SH		 4578 .procname = "hop_limit",
4579 .data = &ipv6_devconf.hop_limit,
4580 .maxlen = sizeof(int),
4581 .mode = 0644,
4582 .proc_handler = proc_dointvec,
1da177e4
LT		 4583 },
4584 {
e21e8467
SH		 4585 .procname = "mtu",
4586 .data = &ipv6_devconf.mtu6,
4587 .maxlen = sizeof(int),
4588 .mode = 0644,
4589 .proc_handler = proc_dointvec,
1da177e4
LT		 4590 },
4591 {
e21e8467
SH		 4592 .procname = "accept_ra",
4593 .data = &ipv6_devconf.accept_ra,
4594 .maxlen = sizeof(int),
4595 .mode = 0644,
4596 .proc_handler = proc_dointvec,
1da177e4
LT		 4597 },
4598 {
e21e8467
SH		 4599 .procname = "accept_redirects",
4600 .data = &ipv6_devconf.accept_redirects,
4601 .maxlen = sizeof(int),
4602 .mode = 0644,
4603 .proc_handler = proc_dointvec,
1da177e4
LT		 4604 },
4605 {
e21e8467
SH		 4606 .procname = "autoconf",
4607 .data = &ipv6_devconf.autoconf,
4608 .maxlen = sizeof(int),
4609 .mode = 0644,
4610 .proc_handler = proc_dointvec,
1da177e4
LT		 4611 },
4612 {
e21e8467
SH		 4613 .procname = "dad_transmits",
4614 .data = &ipv6_devconf.dad_transmits,
4615 .maxlen = sizeof(int),
4616 .mode = 0644,
4617 .proc_handler = proc_dointvec,
1da177e4
LT		 4618 },
4619 {
e21e8467
SH		 4620 .procname = "router_solicitations",
4621 .data = &ipv6_devconf.rtr_solicits,
4622 .maxlen = sizeof(int),
4623 .mode = 0644,
4624 .proc_handler = proc_dointvec,
1da177e4
LT		 4625 },
4626 {
e21e8467
SH		 4627 .procname = "router_solicitation_interval",
4628 .data = &ipv6_devconf.rtr_solicit_interval,
4629 .maxlen = sizeof(int),
4630 .mode = 0644,
4631 .proc_handler = proc_dointvec_jiffies,
1da177e4
LT		 4632 },
4633 {
e21e8467
SH		 4634 .procname = "router_solicitation_delay",
4635 .data = &ipv6_devconf.rtr_solicit_delay,
4636 .maxlen = sizeof(int),
4637 .mode = 0644,
4638 .proc_handler = proc_dointvec_jiffies,
1da177e4
LT		 4639 },
4640 {
e21e8467
SH		 4641 .procname = "force_mld_version",
4642 .data = &ipv6_devconf.force_mld_version,
4643 .maxlen = sizeof(int),
4644 .mode = 0644,
4645 .proc_handler = proc_dointvec,
1da177e4
LT		 4646 },
4647#ifdef CONFIG_IPV6_PRIVACY
4648 {
e21e8467
SH		 4649 .procname = "use_tempaddr",
4650 .data = &ipv6_devconf.use_tempaddr,
4651 .maxlen = sizeof(int),
4652 .mode = 0644,
4653 .proc_handler = proc_dointvec,
1da177e4
LT		 4654 },
4655 {
e21e8467
SH		 4656 .procname = "temp_valid_lft",
4657 .data = &ipv6_devconf.temp_valid_lft,
4658 .maxlen = sizeof(int),
4659 .mode = 0644,
4660 .proc_handler = proc_dointvec,
1da177e4
LT		 4661 },
4662 {
e21e8467
SH		 4663 .procname = "temp_prefered_lft",
4664 .data = &ipv6_devconf.temp_prefered_lft,
4665 .maxlen = sizeof(int),
4666 .mode = 0644,
4667 .proc_handler = proc_dointvec,
1da177e4
LT		 4668 },
4669 {
e21e8467
SH		 4670 .procname = "regen_max_retry",
4671 .data = &ipv6_devconf.regen_max_retry,
4672 .maxlen = sizeof(int),
4673 .mode = 0644,
4674 .proc_handler = proc_dointvec,
1da177e4
LT		 4675 },
4676 {
e21e8467
SH		 4677 .procname = "max_desync_factor",
4678 .data = &ipv6_devconf.max_desync_factor,
4679 .maxlen = sizeof(int),
4680 .mode = 0644,
4681 .proc_handler = proc_dointvec,
1da177e4
LT		 4682 },
4683#endif
4684 {
e21e8467
SH		 4685 .procname = "max_addresses",
4686 .data = &ipv6_devconf.max_addresses,
4687 .maxlen = sizeof(int),
4688 .mode = 0644,
4689 .proc_handler = proc_dointvec,
1da177e4 4690 },
65f5c7c1 4691 {
e21e8467
SH		 4692 .procname = "accept_ra_defrtr",
4693 .data = &ipv6_devconf.accept_ra_defrtr,
4694 .maxlen = sizeof(int),
4695 .mode = 0644,
4696 .proc_handler = proc_dointvec,
65f5c7c1 4697 },
c4fd30eb 4698 {
e21e8467
SH		 4699 .procname = "accept_ra_pinfo",
4700 .data = &ipv6_devconf.accept_ra_pinfo,
4701 .maxlen = sizeof(int),
4702 .mode = 0644,
4703 .proc_handler = proc_dointvec,
c4fd30eb 4704 },
930d6ff2
YH		 4705#ifdef CONFIG_IPV6_ROUTER_PREF
4706 {
e21e8467
SH		 4707 .procname = "accept_ra_rtr_pref",
4708 .data = &ipv6_devconf.accept_ra_rtr_pref,
4709 .maxlen = sizeof(int),
4710 .mode = 0644,
4711 .proc_handler = proc_dointvec,
930d6ff2 4712 },
52e16356 4713 {
e21e8467
SH		 4714 .procname = "router_probe_interval",
4715 .data = &ipv6_devconf.rtr_probe_interval,
4716 .maxlen = sizeof(int),
4717 .mode = 0644,
4718 .proc_handler = proc_dointvec_jiffies,
52e16356 4719 },
fa03ef38 4720#ifdef CONFIG_IPV6_ROUTE_INFO
09c884d4 4721 {
e21e8467
SH		 4722 .procname = "accept_ra_rt_info_max_plen",
4723 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
4724 .maxlen = sizeof(int),
4725 .mode = 0644,
4726 .proc_handler = proc_dointvec,
09c884d4
YH		 4727 },
4728#endif
930d6ff2 4729#endif
fbea49e1 4730 {
e21e8467
SH		 4731 .procname = "proxy_ndp",
4732 .data = &ipv6_devconf.proxy_ndp,
4733 .maxlen = sizeof(int),
4734 .mode = 0644,
4735 .proc_handler = proc_dointvec,
fbea49e1 4736 },
0bcbc926 4737 {
e21e8467
SH		 4738 .procname = "accept_source_route",
4739 .data = &ipv6_devconf.accept_source_route,
4740 .maxlen = sizeof(int),
4741 .mode = 0644,
4742 .proc_handler = proc_dointvec,
0bcbc926 4743 },
95c385b4
NH		 4744#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4745 {
e21e8467
SH		 4746 .procname = "optimistic_dad",
4747 .data = &ipv6_devconf.optimistic_dad,
4748 .maxlen = sizeof(int),
4749 .mode = 0644,
4750 .proc_handler = proc_dointvec,
95c385b4
NH		 4751
4752 },
7bc570c8
YH		 4753#endif
4754#ifdef CONFIG_IPV6_MROUTE
4755 {
e21e8467
SH		 4756 .procname = "mc_forwarding",
4757 .data = &ipv6_devconf.mc_forwarding,
4758 .maxlen = sizeof(int),
4759 .mode = 0444,
4760 .proc_handler = proc_dointvec,
7bc570c8 4761 },
95c385b4 4762#endif
778d80be 4763 {
e21e8467
SH		 4764 .procname = "disable_ipv6",
4765 .data = &ipv6_devconf.disable_ipv6,
4766 .maxlen = sizeof(int),
4767 .mode = 0644,
4768 .proc_handler = addrconf_sysctl_disable,
778d80be 4769 },
1b34be74 4770 {
e21e8467
SH		 4771 .procname = "accept_dad",
4772 .data = &ipv6_devconf.accept_dad,
4773 .maxlen = sizeof(int),
4774 .mode = 0644,
4775 .proc_handler = proc_dointvec,
1b34be74 4776 },
f7734fdf 4777 {
f7734fdf
OP		 4778 .procname = "force_tllao",
4779 .data = &ipv6_devconf.force_tllao,
4780 .maxlen = sizeof(int),
4781 .mode = 0644,
4782 .proc_handler = proc_dointvec
4783 },
5cb04436
HFS		 4784 {
4785 .procname = "ndisc_notify",
4786 .data = &ipv6_devconf.ndisc_notify,
4787 .maxlen = sizeof(int),
4788 .mode = 0644,
4789 .proc_handler = proc_dointvec
4790 },
1da177e4 4791 {
f8572d8f 4792 /* sentinel */
1da177e4
LT		 4793 }
4794 },
1da177e4
LT		 4795};
4796
bff16c2f 4797static int __addrconf_sysctl_register(struct net *net, char *dev_name,
f8572d8f 4798 struct inet6_dev *idev, struct ipv6_devconf *p)
1da177e4
LT		 4799{
4800 int i;
1da177e4 4801 struct addrconf_sysctl_table *t;
6105e293 4802 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ];
1dab6222 4803
af879cc7 4804 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
1da177e4 4805 if (t == NULL)
f68635e6
PE		 4806 goto out;
4807
bcdd553f 4808 for (i = 0; t->addrconf_vars[i].data; i++) {
e21e8467 4809 t->addrconf_vars[i].data += (char *)p - (char *)&ipv6_devconf;
1da177e4 4810 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
bff16c2f 4811 t->addrconf_vars[i].extra2 = net;
1da177e4 4812 }
1da177e4 4813
6105e293 4814 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name);
1da177e4 4815
6105e293 4816 t->sysctl_header = register_net_sysctl(net, path, t->addrconf_vars);
1da177e4 4817 if (t->sysctl_header == NULL)
6105e293 4818 goto free;
f68635e6
PE		 4819
4820 p->sysctl = t;
95897312 4821 return 0;
1da177e4 4822
f68635e6 4823free:
1da177e4 4824 kfree(t);
f68635e6 4825out:
95897312 4826 return -ENOBUFS;
1da177e4
LT		 4827}
4828
408c4768
PE		 4829static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
4830{
4831 struct addrconf_sysctl_table *t;
4832
4833 if (p->sysctl == NULL)
4834 return;
4835
4836 t = p->sysctl;
4837 p->sysctl = NULL;
ff538818 4838 unregister_net_sysctl_table(t->sysctl_header);
408c4768
PE		 4839 kfree(t);
4840}
4841
f52295a9
PE		 4842static void addrconf_sysctl_register(struct inet6_dev *idev)
4843{
54716e3b 4844 neigh_sysctl_register(idev->dev, idev->nd_parms, "ipv6",
f8572d8f 4845 &ndisc_ifinfo_sysctl_change);
c346dca1 4846 __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
f8572d8f 4847 idev, &idev->cnf);
f52295a9
PE		 4848}
4849
408c4768 4850static void addrconf_sysctl_unregister(struct inet6_dev *idev)
1da177e4 4851{
408c4768
PE		 4852 __addrconf_sysctl_unregister(&idev->cnf);
4853 neigh_sysctl_unregister(idev->nd_parms);
1da177e4
LT		 4854}
4855
4856
4857#endif
4858
2c8c1e72 4859static int __net_init addrconf_init_net(struct net *net)
e0da5a48
PE		 4860{
4861 int err;
4862 struct ipv6_devconf *all, *dflt;
4863
4864 err = -ENOMEM;
4865 all = &ipv6_devconf;
4866 dflt = &ipv6_devconf_dflt;
4867
09ad9bc7 4868 if (!net_eq(net, &init_net)) {
e0da5a48
PE		 4869 all = kmemdup(all, sizeof(ipv6_devconf), GFP_KERNEL);
4870 if (all == NULL)
4871 goto err_alloc_all;
4872
4873 dflt = kmemdup(dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
4874 if (dflt == NULL)
4875 goto err_alloc_dflt;
56d417b1
BH		 4876 } else {
4877 /* these will be inherited by all namespaces */
4878 dflt->autoconf = ipv6_defaults.autoconf;
4879 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
e0da5a48
PE		 4880 }
4881
4882 net->ipv6.devconf_all = all;
4883 net->ipv6.devconf_dflt = dflt;
4884
4885#ifdef CONFIG_SYSCTL
f8572d8f 4886 err = __addrconf_sysctl_register(net, "all", NULL, all);
e0da5a48
PE		 4887 if (err < 0)
4888 goto err_reg_all;
4889
f8572d8f 4890 err = __addrconf_sysctl_register(net, "default", NULL, dflt);
e0da5a48
PE		 4891 if (err < 0)
4892 goto err_reg_dflt;
4893#endif
4894 return 0;
4895
4896#ifdef CONFIG_SYSCTL
4897err_reg_dflt:
4898 __addrconf_sysctl_unregister(all);
4899err_reg_all:
4900 kfree(dflt);
4901#endif
4902err_alloc_dflt:
4903 kfree(all);
4904err_alloc_all:
4905 return err;
4906}
4907
2c8c1e72 4908static void __net_exit addrconf_exit_net(struct net *net)
e0da5a48
PE		 4909{
4910#ifdef CONFIG_SYSCTL
4911 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
4912 __addrconf_sysctl_unregister(net->ipv6.devconf_all);
4913#endif
09ad9bc7 4914 if (!net_eq(net, &init_net)) {
e0da5a48
PE		 4915 kfree(net->ipv6.devconf_dflt);
4916 kfree(net->ipv6.devconf_all);
4917 }
4918}
4919
4920static struct pernet_operations addrconf_ops = {
4921 .init = addrconf_init_net,
4922 .exit = addrconf_exit_net,
4923};
4924
1da177e4
LT		 4925/*
4926 * Device notifier
4927 */
4928
4929int register_inet6addr_notifier(struct notifier_block *nb)
4930{
1ab1457c 4931 return atomic_notifier_chain_register(&inet6addr_chain, nb);
1da177e4 4932}
7159039a
YH		 4933EXPORT_SYMBOL(register_inet6addr_notifier);
4934
1da177e4
LT		 4935int unregister_inet6addr_notifier(struct notifier_block *nb)
4936{
e21e8467 4937 return atomic_notifier_chain_unregister(&inet6addr_chain, nb);
1da177e4 4938}
7159039a
YH		 4939EXPORT_SYMBOL(unregister_inet6addr_notifier);
4940
b382b191
TG		 4941static struct rtnl_af_ops inet6_ops = {
4942 .family = AF_INET6,
4943 .fill_link_af = inet6_fill_link_af,
4944 .get_link_af_size = inet6_get_link_af_size,
b382b191
TG		 4945};
4946
1da177e4
LT		 4947/*
4948 * Init / cleanup code
4949 */
4950
4951int __init addrconf_init(void)
4952{
c2e21293 4953 int i, err;
2a8cc6c8 4954
e21e8467
SH		 4955 err = ipv6_addr_label_init();
4956 if (err < 0) {
f3213831
JP		 4957 pr_crit("%s: cannot initialize default policy table: %d\n",
4958 __func__, err);
2cc6d2bf 4959 goto out;
2a8cc6c8 4960 }
1da177e4 4961
2cc6d2bf
NH		 4962 err = register_pernet_subsys(&addrconf_ops);
4963 if (err < 0)
4964 goto out_addrlabel;
e0da5a48 4965
1da177e4
LT		 4966 /* The addrconf netdev notifier requires that loopback_dev
4967 * has it's ipv6 private information allocated and setup
4968 * before it can bring up and give link-local addresses
4969 * to other devices which are up.
4970 *
4971 * Unfortunately, loopback_dev is not necessarily the first
4972 * entry in the global dev_base list of net devices. In fact,
4973 * it is likely to be the very last entry on that list.
4974 * So this causes the notifier registry below to try and
4975 * give link-local addresses to all devices besides loopback_dev
4976 * first, then loopback_dev, which cases all the non-loopback_dev
4977 * devices to fail to get a link-local address.
4978 *
4979 * So, as a temporary fix, allocate the ipv6 structure for
4980 * loopback_dev first by hand.
4981 * Longer term, all of the dependencies ipv6 has upon the loopback
4982 * device and it being up should be removed.
4983 */
4984 rtnl_lock();
2774c7ab 4985 if (!ipv6_add_dev(init_net.loopback_dev))
1da177e4
LT		 4986 err = -ENOMEM;
4987 rtnl_unlock();
4988 if (err)
e0da5a48 4989 goto errlo;
1da177e4 4990
c2e21293 4991 for (i = 0; i < IN6_ADDR_HSIZE; i++)
4992 INIT_HLIST_HEAD(&inet6_addr_lst[i]);
4993
1da177e4
LT		 4994 register_netdevice_notifier(&ipv6_dev_notf);
4995
1da177e4 4996 addrconf_verify(0);
c127ea2c 4997
b382b191
TG		 4998 err = rtnl_af_register(&inet6_ops);
4999 if (err < 0)
5000 goto errout_af;
5001
c7ac8679
GR		 5002 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo,
5003 NULL);
c127ea2c
TG		 5004 if (err < 0)
5005 goto errout;
5006
5007 /* Only the first call to __rtnl_register can fail */
c7ac8679
GR		 5008 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL, NULL);
5009 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL, NULL);
5010 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr,
5011 inet6_dump_ifaddr, NULL);
5012 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL,
5013 inet6_dump_ifmcaddr, NULL);
5014 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL,
5015 inet6_dump_ifacaddr, NULL);
76f8f6cb 5016 __rtnl_register(PF_INET6, RTM_GETNETCONF, inet6_netconf_get_devconf,
7a674200 5017 inet6_netconf_dump_devconf, NULL);
c127ea2c 5018
2a8cc6c8
YH		 5019 ipv6_addr_label_rtnl_register();
5020
1da177e4 5021 return 0;
c127ea2c 5022errout:
b382b191
TG		 5023 rtnl_af_unregister(&inet6_ops);
5024errout_af:
c127ea2c 5025 unregister_netdevice_notifier(&ipv6_dev_notf);
e0da5a48
PE		 5026errlo:
5027 unregister_pernet_subsys(&addrconf_ops);
2cc6d2bf
NH		 5028out_addrlabel:
5029 ipv6_addr_label_cleanup();
5030out:
c127ea2c 5031 return err;
1da177e4
LT		 5032}
5033
09f7709f 5034void addrconf_cleanup(void)
1da177e4 5035{
176c39af 5036 struct net_device *dev;
1da177e4
LT		 5037 int i;
5038
5039 unregister_netdevice_notifier(&ipv6_dev_notf);
e0da5a48 5040 unregister_pernet_subsys(&addrconf_ops);
2cc6d2bf 5041 ipv6_addr_label_cleanup();
1da177e4
LT		 5042
5043 rtnl_lock();
5044
b382b191
TG		 5045 __rtnl_af_unregister(&inet6_ops);
5046
176c39af
DL		 5047 /* clean dev list */
5048 for_each_netdev(&init_net, dev) {
5049 if (__in6_dev_get(dev) == NULL)
5050 continue;
5051 addrconf_ifdown(dev, 1);
5052 }
5053 addrconf_ifdown(init_net.loopback_dev, 2);
5054
1da177e4
LT		 5055 /*
5056 * Check hash table.
5057 */
5c578aed 5058 spin_lock_bh(&addrconf_hash_lock);
c2e21293 5059 for (i = 0; i < IN6_ADDR_HSIZE; i++)
5060 WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
5c578aed 5061 spin_unlock_bh(&addrconf_hash_lock);
1da177e4
LT		 5062
5063 del_timer(&addr_chk_timer);
1da177e4 5064 rtnl_unlock();
1da177e4 5065}
Ubuntu Jammy Linux kernel mirror