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Merge tag 'char-misc-3.19-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregk...
[linux-2.6-block.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>
cb6bf355 73#include <net/firewire.h>
1da177e4
LT		 74#include <net/ipv6.h>
75#include <net/protocol.h>
76#include <net/ndisc.h>
77#include <net/ip6_route.h>
78#include <net/addrconf.h>
79#include <net/tcp.h>
80#include <net/ip.h>
5d620266 81#include <net/netlink.h>
f24e3d65 82#include <net/pkt_sched.h>
1da177e4
LT		 83#include <linux/if_tunnel.h>
84#include <linux/rtnetlink.h>
f3a1bfb1 85#include <linux/netconf.h>
1da177e4 86#include <linux/random.h>
e21e8467 87#include <linux/uaccess.h>
7f7d9a6b 88#include <asm/unaligned.h>
1da177e4
LT		 89
90#include <linux/proc_fs.h>
91#include <linux/seq_file.h>
bc3b2d7f 92#include <linux/export.h>
1da177e4
LT		 93
94/* Set to 3 to get tracing... */
95#define ACONF_DEBUG 2
96
97#if ACONF_DEBUG >= 3
ba3542e1 98#define ADBG(fmt, ...) printk(fmt, ##__VA_ARGS__)
1da177e4 99#else
ba3542e1 100#define ADBG(fmt, ...) do { if (0) printk(fmt, ##__VA_ARGS__); } while (0)
1da177e4
LT		 101#endif
102
103#define INFINITY_LIFE_TIME 0xFFFFFFFF
18a31e1e
TG		 104
105static inline u32 cstamp_delta(unsigned long cstamp)
106{
107 return (cstamp - INITIAL_JIFFIES) * 100UL / HZ;
108}
1da177e4
LT		 109
110#ifdef CONFIG_SYSCTL
a317a2f1 111static int addrconf_sysctl_register(struct inet6_dev *idev);
408c4768
PE		 112static void addrconf_sysctl_unregister(struct inet6_dev *idev);
113#else
a317a2f1 114static inline int addrconf_sysctl_register(struct inet6_dev *idev)
408c4768 115{
a317a2f1 116 return 0;
408c4768
PE		 117}
118
119static inline void addrconf_sysctl_unregister(struct inet6_dev *idev)
120{
121}
1da177e4
LT		 122#endif
123
eb7e0575
SD		 124static void __ipv6_regen_rndid(struct inet6_dev *idev);
125static void __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
1da177e4 126static void ipv6_regen_rndid(unsigned long data);
1da177e4 127
1b34be74 128static int ipv6_generate_eui64(u8 *eui, struct net_device *dev);
1da177e4
LT		 129static int ipv6_count_addresses(struct inet6_dev *idev);
130
131/*
132 * Configured unicast address hash table
133 */
c2e21293 134static struct hlist_head inet6_addr_lst[IN6_ADDR_HSIZE];
5c578aed 135static DEFINE_SPINLOCK(addrconf_hash_lock);
1da177e4 136
c15b1cca
HFS		 137static void addrconf_verify(void);
138static void addrconf_verify_rtnl(void);
139static void addrconf_verify_work(struct work_struct *);
1da177e4 140
c15b1cca
HFS		 141static struct workqueue_struct *addrconf_wq;
142static DECLARE_DELAYED_WORK(addr_chk_work, addrconf_verify_work);
1da177e4
LT		 143
144static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
145static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
146
93d9b7d7
JP		 147static void addrconf_type_change(struct net_device *dev,
148 unsigned long event);
1da177e4
LT		 149static int addrconf_ifdown(struct net_device *dev, int how);
150
21caa662
RK		 151static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
152 int plen,
153 const struct net_device *dev,
154 u32 flags, u32 noflags);
155
cf22f9a2 156static void addrconf_dad_start(struct inet6_ifaddr *ifp);
c15b1cca 157static void addrconf_dad_work(struct work_struct *w);
1da177e4 158static void addrconf_dad_completed(struct inet6_ifaddr *ifp);
c5e33bdd 159static void addrconf_dad_run(struct inet6_dev *idev);
1da177e4
LT		 160static void addrconf_rs_timer(unsigned long data);
161static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
162static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
163
1ab1457c 164static void inet6_prefix_notify(int event, struct inet6_dev *idev,
1da177e4 165 struct prefix_info *pinfo);
3e81c6da
DM		 166static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
167 struct net_device *dev);
1da177e4 168
888c848e 169static struct ipv6_devconf ipv6_devconf __read_mostly = {
1da177e4
LT		 170 .forwarding = 0,
171 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
172 .mtu6 = IPV6_MIN_MTU,
173 .accept_ra = 1,
174 .accept_redirects = 1,
175 .autoconf = 1,
176 .force_mld_version = 0,
fc4eba58
HFS		 177 .mldv1_unsolicited_report_interval = 10 * HZ,
178 .mldv2_unsolicited_report_interval = HZ,
1da177e4
LT		 179 .dad_transmits = 1,
180 .rtr_solicits = MAX_RTR_SOLICITATIONS,
181 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
182 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
67ba4152 183 .use_tempaddr = 0,
1da177e4
LT		 184 .temp_valid_lft = TEMP_VALID_LIFETIME,
185 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
186 .regen_max_retry = REGEN_MAX_RETRY,
187 .max_desync_factor = MAX_DESYNC_FACTOR,
1da177e4 188 .max_addresses = IPV6_MAX_ADDRESSES,
65f5c7c1 189 .accept_ra_defrtr = 1,
d9333196 190 .accept_ra_from_local = 0,
c4fd30eb 191 .accept_ra_pinfo = 1,
930d6ff2
YH		 192#ifdef CONFIG_IPV6_ROUTER_PREF
193 .accept_ra_rtr_pref = 1,
52e16356 194 .rtr_probe_interval = 60 * HZ,
09c884d4
YH		 195#ifdef CONFIG_IPV6_ROUTE_INFO
196 .accept_ra_rt_info_max_plen = 0,
197#endif
930d6ff2 198#endif
fbea49e1 199 .proxy_ndp = 0,
0bcbc926 200 .accept_source_route = 0, /* we do not accept RH0 by default. */
778d80be 201 .disable_ipv6 = 0,
1b34be74 202 .accept_dad = 1,
b800c3b9 203 .suppress_frag_ndisc = 1,
1da177e4
LT		 204};
205
ab32ea5d 206static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
1da177e4
LT		 207 .forwarding = 0,
208 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
209 .mtu6 = IPV6_MIN_MTU,
210 .accept_ra = 1,
211 .accept_redirects = 1,
212 .autoconf = 1,
fc4eba58
HFS		 213 .force_mld_version = 0,
214 .mldv1_unsolicited_report_interval = 10 * HZ,
215 .mldv2_unsolicited_report_interval = HZ,
1da177e4
LT		 216 .dad_transmits = 1,
217 .rtr_solicits = MAX_RTR_SOLICITATIONS,
218 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
219 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
1da177e4
LT		 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,
1da177e4 225 .max_addresses = IPV6_MAX_ADDRESSES,
65f5c7c1 226 .accept_ra_defrtr = 1,
d9333196 227 .accept_ra_from_local = 0,
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,
b800c3b9 240 .suppress_frag_ndisc = 1,
1da177e4
LT		 241};
242
f24e3d65 243/* Check if a valid qdisc is available */
05297949 244static inline bool addrconf_qdisc_ok(const struct net_device *dev)
f24e3d65 245{
05297949 246 return !qdisc_tx_is_noop(dev);
f24e3d65
MC		 247}
248
b7b1bfce 249static void addrconf_del_rs_timer(struct inet6_dev *idev)
1da177e4 250{
b7b1bfce
HFS		 251 if (del_timer(&idev->rs_timer))
252 __in6_dev_put(idev);
253}
254
c15b1cca 255static void addrconf_del_dad_work(struct inet6_ifaddr *ifp)
b7b1bfce 256{
c15b1cca 257 if (cancel_delayed_work(&ifp->dad_work))
1da177e4
LT		 258 __in6_ifa_put(ifp);
259}
260
b7b1bfce
HFS		 261static void addrconf_mod_rs_timer(struct inet6_dev *idev,
262 unsigned long when)
263{
264 if (!timer_pending(&idev->rs_timer))
265 in6_dev_hold(idev);
266 mod_timer(&idev->rs_timer, jiffies + when);
267}
1da177e4 268
c15b1cca
HFS		 269static void addrconf_mod_dad_work(struct inet6_ifaddr *ifp,
270 unsigned long delay)
1da177e4 271{
c15b1cca 272 if (!delayed_work_pending(&ifp->dad_work))
1da177e4 273 in6_ifa_hold(ifp);
c15b1cca 274 mod_delayed_work(addrconf_wq, &ifp->dad_work, delay);
1da177e4
LT		 275}
276
7f7d9a6b
HX		 277static int snmp6_alloc_dev(struct inet6_dev *idev)
278{
827da44c
JS		 279 int i;
280
698365fa
WC		 281 idev->stats.ipv6 = alloc_percpu(struct ipstats_mib);
282 if (!idev->stats.ipv6)
7f7d9a6b 283 goto err_ip;
827da44c
JS		 284
285 for_each_possible_cpu(i) {
286 struct ipstats_mib *addrconf_stats;
698365fa 287 addrconf_stats = per_cpu_ptr(idev->stats.ipv6, i);
827da44c 288 u64_stats_init(&addrconf_stats->syncp);
827da44c
JS		 289 }
290
291
be281e55
ED		 292 idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device),
293 GFP_KERNEL);
294 if (!idev->stats.icmpv6dev)
7f7d9a6b 295 goto err_icmp;
be281e55
ED		 296 idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device),
297 GFP_KERNEL);
298 if (!idev->stats.icmpv6msgdev)
14878f75 299 goto err_icmpmsg;
7f7d9a6b
HX		 300
301 return 0;
302
14878f75 303err_icmpmsg:
be281e55 304 kfree(idev->stats.icmpv6dev);
7f7d9a6b 305err_icmp:
698365fa 306 free_percpu(idev->stats.ipv6);
7f7d9a6b 307err_ip:
aaf70ec7 308 return -ENOMEM;
7f7d9a6b
HX		 309}
310
8e5e8f30 311static struct inet6_dev *ipv6_add_dev(struct net_device *dev)
1da177e4
LT		 312{
313 struct inet6_dev *ndev;
a317a2f1 314 int err = -ENOMEM;
1da177e4
LT		 315
316 ASSERT_RTNL();
317
318 if (dev->mtu < IPV6_MIN_MTU)
a317a2f1 319 return ERR_PTR(-EINVAL);
1da177e4 320
1ab1457c 321 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
1ab1457c 322 if (ndev == NULL)
a317a2f1 323 return ERR_PTR(err);
322f74a4
IO		 324
325 rwlock_init(&ndev->lock);
326 ndev->dev = dev;
502a2ffd 327 INIT_LIST_HEAD(&ndev->addr_list);
b7b1bfce
HFS		 328 setup_timer(&ndev->rs_timer, addrconf_rs_timer,
329 (unsigned long)ndev);
c346dca1 330 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf));
322f74a4
IO		 331 ndev->cnf.mtu6 = dev->mtu;
332 ndev->cnf.sysctl = NULL;
333 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
334 if (ndev->nd_parms == NULL) {
335 kfree(ndev);
a317a2f1 336 return ERR_PTR(err);
322f74a4 337 }
0187bdfb
BH		 338 if (ndev->cnf.forwarding)
339 dev_disable_lro(dev);
322f74a4
IO		 340 /* We refer to the device */
341 dev_hold(dev);
1da177e4 342
322f74a4 343 if (snmp6_alloc_dev(ndev) < 0) {
ba3542e1 344 ADBG(KERN_WARNING
f3213831 345 "%s: cannot allocate memory for statistics; dev=%s.\n",
ba3542e1 346 __func__, dev->name);
322f74a4 347 neigh_parms_release(&nd_tbl, ndev->nd_parms);
8603e33d
RL		 348 dev_put(dev);
349 kfree(ndev);
a317a2f1 350 return ERR_PTR(err);
322f74a4 351 }
1da177e4 352
322f74a4 353 if (snmp6_register_dev(ndev) < 0) {
ba3542e1 354 ADBG(KERN_WARNING
f3213831 355 "%s: cannot create /proc/net/dev_snmp6/%s\n",
ba3542e1 356 __func__, dev->name);
a317a2f1 357 goto err_release;
322f74a4
IO		 358 }
359
360 /* One reference from device. We must do this before
361 * we invoke __ipv6_regen_rndid().
362 */
363 in6_dev_hold(ndev);
1da177e4 364
1b34be74
YH		 365 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
366 ndev->cnf.accept_dad = -1;
367
07a93626 368#if IS_ENABLED(CONFIG_IPV6_SIT)
b077d7ab 369 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
f3213831 370 pr_info("%s: Disabled Multicast RS\n", dev->name);
b077d7ab
YH		 371 ndev->cnf.rtr_solicits = 0;
372 }
373#endif
374
372e6c8f 375 INIT_LIST_HEAD(&ndev->tempaddr_list);
b24b8a24 376 setup_timer(&ndev->regen_timer, ipv6_regen_rndid, (unsigned long)ndev);
322f74a4
IO		 377 if ((dev->flags&IFF_LOOPBACK) ||
378 dev->type == ARPHRD_TUNNEL ||
9625ed72 379 dev->type == ARPHRD_TUNNEL6 ||
0be669bb 380 dev->type == ARPHRD_SIT ||
0be669bb 381 dev->type == ARPHRD_NONE) {
322f74a4
IO		 382 ndev->cnf.use_tempaddr = -1;
383 } else {
384 in6_dev_hold(ndev);
385 ipv6_regen_rndid((unsigned long) ndev);
386 }
5d9efa7e 387
914faa14 388 ndev->token = in6addr_any;
1da177e4 389
f24e3d65 390 if (netif_running(dev) && addrconf_qdisc_ok(dev))
53aadcc9
HX		 391 ndev->if_flags |= IF_READY;
392
322f74a4
IO		 393 ipv6_mc_init_dev(ndev);
394 ndev->tstamp = jiffies;
a317a2f1
WC		 395 err = addrconf_sysctl_register(ndev);
396 if (err) {
397 ipv6_mc_destroy_dev(ndev);
398 del_timer(&ndev->regen_timer);
399 goto err_release;
400 }
30c4cf57 401 /* protected by rtnl_lock */
cf778b00 402 rcu_assign_pointer(dev->ip6_ptr, ndev);
d88ae4cc 403
2c5e8933
HFS		 404 /* Join interface-local all-node multicast group */
405 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allnodes);
406
d88ae4cc 407 /* Join all-node multicast group */
f3ee4010 408 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);
d88ae4cc 409
d6ddef9e 410 /* Join all-router multicast group if forwarding is set */
8b2aaede 411 if (ndev->cnf.forwarding && (dev->flags & IFF_MULTICAST))
d6ddef9e
LW		 412 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
413
1da177e4 414 return ndev;
a317a2f1
WC		 415
416err_release:
417 neigh_parms_release(&nd_tbl, ndev->nd_parms);
418 ndev->dead = 1;
419 in6_dev_finish_destroy(ndev);
420 return ERR_PTR(err);
1da177e4
LT		 421}
422
8e5e8f30 423static struct inet6_dev *ipv6_find_idev(struct net_device *dev)
1da177e4
LT		 424{
425 struct inet6_dev *idev;
426
427 ASSERT_RTNL();
428
e21e8467
SH		 429 idev = __in6_dev_get(dev);
430 if (!idev) {
431 idev = ipv6_add_dev(dev);
a317a2f1 432 if (IS_ERR(idev))
1da177e4
LT		 433 return NULL;
434 }
c5e33bdd 435
1da177e4
LT		 436 if (dev->flags&IFF_UP)
437 ipv6_mc_up(idev);
438 return idev;
439}
440
f3a1bfb1
ND		 441static int inet6_netconf_msgsize_devconf(int type)
442{
443 int size = NLMSG_ALIGN(sizeof(struct netconfmsg))
444 + nla_total_size(4); /* NETCONFA_IFINDEX */
445
76f8f6cb
ND		 446 /* type -1 is used for ALL */
447 if (type == -1 || type == NETCONFA_FORWARDING)
f3a1bfb1 448 size += nla_total_size(4);
b1afce95 449#ifdef CONFIG_IPV6_MROUTE
d67b8c61
ND		 450 if (type == -1 || type == NETCONFA_MC_FORWARDING)
451 size += nla_total_size(4);
b1afce95 452#endif
c92d5491 453 if (type == -1 || type == NETCONFA_PROXY_NEIGH)
454 size += nla_total_size(4);
f3a1bfb1
ND		 455
456 return size;
457}
458
459static int inet6_netconf_fill_devconf(struct sk_buff *skb, int ifindex,
460 struct ipv6_devconf *devconf, u32 portid,
461 u32 seq, int event, unsigned int flags,
462 int type)
463{
464 struct nlmsghdr *nlh;
465 struct netconfmsg *ncm;
466
467 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg),
468 flags);
469 if (nlh == NULL)
470 return -EMSGSIZE;
471
472 ncm = nlmsg_data(nlh);
473 ncm->ncm_family = AF_INET6;
474
475 if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0)
476 goto nla_put_failure;
477
76f8f6cb
ND		 478 /* type -1 is used for ALL */
479 if ((type == -1 || type == NETCONFA_FORWARDING) &&
f3a1bfb1
ND		 480 nla_put_s32(skb, NETCONFA_FORWARDING, devconf->forwarding) < 0)
481 goto nla_put_failure;
b1afce95 482#ifdef CONFIG_IPV6_MROUTE
d67b8c61
ND		 483 if ((type == -1 || type == NETCONFA_MC_FORWARDING) &&
484 nla_put_s32(skb, NETCONFA_MC_FORWARDING,
485 devconf->mc_forwarding) < 0)
486 goto nla_put_failure;
b1afce95 487#endif
c92d5491 488 if ((type == -1 || type == NETCONFA_PROXY_NEIGH) &&
489 nla_put_s32(skb, NETCONFA_PROXY_NEIGH, devconf->proxy_ndp) < 0)
490 goto nla_put_failure;
491
f3a1bfb1
ND		 492 return nlmsg_end(skb, nlh);
493
494nla_put_failure:
495 nlmsg_cancel(skb, nlh);
496 return -EMSGSIZE;
497}
498
d67b8c61
ND		 499void inet6_netconf_notify_devconf(struct net *net, int type, int ifindex,
500 struct ipv6_devconf *devconf)
f3a1bfb1
ND		 501{
502 struct sk_buff *skb;
503 int err = -ENOBUFS;
504
505 skb = nlmsg_new(inet6_netconf_msgsize_devconf(type), GFP_ATOMIC);
506 if (skb == NULL)
507 goto errout;
508
509 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 0, 0,
510 RTM_NEWNETCONF, 0, type);
511 if (err < 0) {
512 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
513 WARN_ON(err == -EMSGSIZE);
514 kfree_skb(skb);
515 goto errout;
516 }
517 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_NETCONF, NULL, GFP_ATOMIC);
518 return;
519errout:
bd779028 520 rtnl_set_sk_err(net, RTNLGRP_IPV6_NETCONF, err);
f3a1bfb1
ND		 521}
522
76f8f6cb
ND		 523static const struct nla_policy devconf_ipv6_policy[NETCONFA_MAX+1] = {
524 [NETCONFA_IFINDEX] = { .len = sizeof(int) },
525 [NETCONFA_FORWARDING] = { .len = sizeof(int) },
c92d5491 526 [NETCONFA_PROXY_NEIGH] = { .len = sizeof(int) },
76f8f6cb
ND		 527};
528
529static int inet6_netconf_get_devconf(struct sk_buff *in_skb,
661d2967 530 struct nlmsghdr *nlh)
76f8f6cb
ND		 531{
532 struct net *net = sock_net(in_skb->sk);
533 struct nlattr *tb[NETCONFA_MAX+1];
534 struct netconfmsg *ncm;
535 struct sk_buff *skb;
536 struct ipv6_devconf *devconf;
537 struct inet6_dev *in6_dev;
538 struct net_device *dev;
539 int ifindex;
540 int err;
541
542 err = nlmsg_parse(nlh, sizeof(*ncm), tb, NETCONFA_MAX,
543 devconf_ipv6_policy);
544 if (err < 0)
545 goto errout;
546
547 err = EINVAL;
548 if (!tb[NETCONFA_IFINDEX])
549 goto errout;
550
551 ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]);
552 switch (ifindex) {
553 case NETCONFA_IFINDEX_ALL:
554 devconf = net->ipv6.devconf_all;
555 break;
556 case NETCONFA_IFINDEX_DEFAULT:
557 devconf = net->ipv6.devconf_dflt;
558 break;
559 default:
560 dev = __dev_get_by_index(net, ifindex);
561 if (dev == NULL)
562 goto errout;
563 in6_dev = __in6_dev_get(dev);
564 if (in6_dev == NULL)
565 goto errout;
566 devconf = &in6_dev->cnf;
567 break;
568 }
569
570 err = -ENOBUFS;
571 skb = nlmsg_new(inet6_netconf_msgsize_devconf(-1), GFP_ATOMIC);
572 if (skb == NULL)
573 goto errout;
574
575 err = inet6_netconf_fill_devconf(skb, ifindex, devconf,
576 NETLINK_CB(in_skb).portid,
577 nlh->nlmsg_seq, RTM_NEWNETCONF, 0,
578 -1);
579 if (err < 0) {
580 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
581 WARN_ON(err == -EMSGSIZE);
582 kfree_skb(skb);
583 goto errout;
584 }
585 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
586errout:
587 return err;
588}
589
7a674200
ND		 590static int inet6_netconf_dump_devconf(struct sk_buff *skb,
591 struct netlink_callback *cb)
592{
593 struct net *net = sock_net(skb->sk);
594 int h, s_h;
595 int idx, s_idx;
596 struct net_device *dev;
597 struct inet6_dev *idev;
598 struct hlist_head *head;
599
600 s_h = cb->args[0];
601 s_idx = idx = cb->args[1];
602
603 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
604 idx = 0;
605 head = &net->dev_index_head[h];
606 rcu_read_lock();
63998ac2
ND		 607 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^
608 net->dev_base_seq;
7a674200
ND		 609 hlist_for_each_entry_rcu(dev, head, index_hlist) {
610 if (idx < s_idx)
611 goto cont;
612 idev = __in6_dev_get(dev);
613 if (!idev)
614 goto cont;
615
616 if (inet6_netconf_fill_devconf(skb, dev->ifindex,
617 &idev->cnf,
618 NETLINK_CB(cb->skb).portid,
619 cb->nlh->nlmsg_seq,
620 RTM_NEWNETCONF,
621 NLM_F_MULTI,
622 -1) <= 0) {
623 rcu_read_unlock();
624 goto done;
625 }
63998ac2 626 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
7a674200
ND		 627cont:
628 idx++;
629 }
630 rcu_read_unlock();
631 }
632 if (h == NETDEV_HASHENTRIES) {
633 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL,
634 net->ipv6.devconf_all,
635 NETLINK_CB(cb->skb).portid,
636 cb->nlh->nlmsg_seq,
637 RTM_NEWNETCONF, NLM_F_MULTI,
638 -1) <= 0)
639 goto done;
640 else
641 h++;
642 }
643 if (h == NETDEV_HASHENTRIES + 1) {
644 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT,
645 net->ipv6.devconf_dflt,
646 NETLINK_CB(cb->skb).portid,
647 cb->nlh->nlmsg_seq,
648 RTM_NEWNETCONF, NLM_F_MULTI,
649 -1) <= 0)
650 goto done;
651 else
652 h++;
653 }
654done:
655 cb->args[0] = h;
656 cb->args[1] = idx;
657
658 return skb->len;
659}
660
1da177e4
LT		 661#ifdef CONFIG_SYSCTL
662static void dev_forward_change(struct inet6_dev *idev)
663{
664 struct net_device *dev;
665 struct inet6_ifaddr *ifa;
1da177e4
LT		 666
667 if (!idev)
668 return;
669 dev = idev->dev;
0187bdfb
BH		 670 if (idev->cnf.forwarding)
671 dev_disable_lro(dev);
1a940835 672 if (dev->flags & IFF_MULTICAST) {
2c5e8933 673 if (idev->cnf.forwarding) {
f3ee4010 674 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
2c5e8933
HFS		 675 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allrouters);
676 ipv6_dev_mc_inc(dev, &in6addr_sitelocal_allrouters);
677 } else {
f3ee4010 678 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
2c5e8933
HFS		 679 ipv6_dev_mc_dec(dev, &in6addr_interfacelocal_allrouters);
680 ipv6_dev_mc_dec(dev, &in6addr_sitelocal_allrouters);
681 }
1da177e4 682 }
502a2ffd 683
684 list_for_each_entry(ifa, &idev->addr_list, if_list) {
2c12a74c
MW		 685 if (ifa->flags&IFA_F_TENTATIVE)
686 continue;
1da177e4
LT		 687 if (idev->cnf.forwarding)
688 addrconf_join_anycast(ifa);
689 else
690 addrconf_leave_anycast(ifa);
691 }
f3a1bfb1
ND		 692 inet6_netconf_notify_devconf(dev_net(dev), NETCONFA_FORWARDING,
693 dev->ifindex, &idev->cnf);
1da177e4
LT		 694}
695
696
e186932b 697static void addrconf_forward_change(struct net *net, __s32 newf)
1da177e4
LT		 698{
699 struct net_device *dev;
700 struct inet6_dev *idev;
701
4acd4945 702 for_each_netdev(net, dev) {
1da177e4
LT		 703 idev = __in6_dev_get(dev);
704 if (idev) {
e186932b
PE		 705 int changed = (!idev->cnf.forwarding) ^ (!newf);
706 idev->cnf.forwarding = newf;
1da177e4
LT		 707 if (changed)
708 dev_forward_change(idev);
709 }
1da177e4 710 }
1da177e4 711}
c8fecf22 712
013d97e9 713static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf)
c8fecf22 714{
bff16c2f 715 struct net *net;
013d97e9
FR		 716 int old;
717
718 if (!rtnl_trylock())
719 return restart_syscall();
bff16c2f
PE		 720
721 net = (struct net *)table->extra2;
013d97e9
FR		 722 old = *p;
723 *p = newf;
b325fddb 724
013d97e9 725 if (p == &net->ipv6.devconf_dflt->forwarding) {
f3a1bfb1
ND		 726 if ((!newf) ^ (!old))
727 inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING,
728 NETCONFA_IFINDEX_DEFAULT,
729 net->ipv6.devconf_dflt);
013d97e9
FR		 730 rtnl_unlock();
731 return 0;
88af182e 732 }
c8fecf22 733
e186932b 734 if (p == &net->ipv6.devconf_all->forwarding) {
e186932b
PE		 735 net->ipv6.devconf_dflt->forwarding = newf;
736 addrconf_forward_change(net, newf);
f3a1bfb1
ND		 737 if ((!newf) ^ (!old))
738 inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING,
739 NETCONFA_IFINDEX_ALL,
740 net->ipv6.devconf_all);
013d97e9 741 } else if ((!newf) ^ (!old))
c8fecf22 742 dev_forward_change((struct inet6_dev *)table->extra1);
0187bdfb 743 rtnl_unlock();
c8fecf22 744
013d97e9 745 if (newf)
7b4da532 746 rt6_purge_dflt_routers(net);
b325fddb 747 return 1;
c8fecf22 748}
1da177e4
LT		 749#endif
750
5c578aed 751/* Nobody refers to this ifaddr, destroy it */
1da177e4
LT		 752void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
753{
c2e21293 754 WARN_ON(!hlist_unhashed(&ifp->addr_lst));
547b792c 755
1da177e4 756#ifdef NET_REFCNT_DEBUG
91df42be 757 pr_debug("%s\n", __func__);
1da177e4
LT		 758#endif
759
760 in6_dev_put(ifp->idev);
761
c15b1cca
HFS		 762 if (cancel_delayed_work(&ifp->dad_work))
763 pr_notice("delayed DAD work was pending while freeing ifa=%p\n",
764 ifp);
1da177e4 765
e9d3e084 766 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
f3213831 767 pr_warn("Freeing alive inet6 address %p\n", ifp);
1da177e4
LT		 768 return;
769 }
94e187c0 770 ip6_rt_put(ifp->rt);
1da177e4 771
e5785985 772 kfree_rcu(ifp, rcu);
1da177e4
LT		 773}
774
e55ffac6
BH		 775static void
776ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
777{
502a2ffd 778 struct list_head *p;
8a6ce0c0 779 int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
e55ffac6
BH		 780
781 /*
782 * Each device address list is sorted in order of scope -
783 * global before linklocal.
784 */
502a2ffd 785 list_for_each(p, &idev->addr_list) {
786 struct inet6_ifaddr *ifa
787 = list_entry(p, struct inet6_ifaddr, if_list);
8a6ce0c0 788 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
e55ffac6
BH		 789 break;
790 }
791
b54c9b98 792 list_add_tail(&ifp->if_list, p);
e55ffac6
BH		 793}
794
ddbe5032 795static u32 inet6_addr_hash(const struct in6_addr *addr)
3eb84f49 796{
ddbe5032 797 return hash_32(ipv6_addr_hash(addr), IN6_ADDR_HSIZE_SHIFT);
3eb84f49
YH		 798}
799
1da177e4
LT		 800/* On success it returns ifp with increased reference count */
801
802static struct inet6_ifaddr *
3f8f5298
JP		 803ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
804 const struct in6_addr *peer_addr, int pfxlen,
8a226b2c 805 int scope, u32 flags, u32 valid_lft, u32 prefered_lft)
1da177e4
LT		 806{
807 struct inet6_ifaddr *ifa = NULL;
808 struct rt6_info *rt;
3a88a81d 809 unsigned int hash;
1da177e4 810 int err = 0;
d68b8270
YH		 811 int addr_type = ipv6_addr_type(addr);
812
813 if (addr_type == IPV6_ADDR_ANY ||
814 addr_type & IPV6_ADDR_MULTICAST ||
815 (!(idev->dev->flags & IFF_LOOPBACK) &&
816 addr_type & IPV6_ADDR_LOOPBACK))
817 return ERR_PTR(-EADDRNOTAVAIL);
1da177e4 818
8814c4b5 819 rcu_read_lock_bh();
1da177e4
LT		 820 if (idev->dead) {
821 err = -ENODEV; /*XXX*/
822 goto out2;
823 }
824
56d417b1 825 if (idev->cnf.disable_ipv6) {
9bdd8d40
BH		 826 err = -EACCES;
827 goto out2;
828 }
829
5c578aed 830 spin_lock(&addrconf_hash_lock);
1da177e4
LT		 831
832 /* Ignore adding duplicate addresses on an interface */
c346dca1 833 if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) {
ba3542e1 834 ADBG("ipv6_add_addr: already assigned\n");
1da177e4
LT		 835 err = -EEXIST;
836 goto out;
837 }
838
322f74a4 839 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
1da177e4
LT		 840
841 if (ifa == NULL) {
ba3542e1 842 ADBG("ipv6_add_addr: malloc failed\n");
1da177e4
LT		 843 err = -ENOBUFS;
844 goto out;
845 }
846
8f031519 847 rt = addrconf_dst_alloc(idev, addr, false);
1da177e4
LT		 848 if (IS_ERR(rt)) {
849 err = PTR_ERR(rt);
850 goto out;
851 }
852
bba24896
JP		 853 neigh_parms_data_state_setall(idev->nd_parms);
854
4e3fd7a0 855 ifa->addr = *addr;
3f8f5298
JP		 856 if (peer_addr)
857 ifa->peer_addr = *peer_addr;
1da177e4
LT		 858
859 spin_lock_init(&ifa->lock);
e9d3e084 860 spin_lock_init(&ifa->state_lock);
c15b1cca 861 INIT_DELAYED_WORK(&ifa->dad_work, addrconf_dad_work);
c2e21293 862 INIT_HLIST_NODE(&ifa->addr_lst);
1da177e4
LT		 863 ifa->scope = scope;
864 ifa->prefix_len = pfxlen;
865 ifa->flags = flags | IFA_F_TENTATIVE;
8a226b2c
JB		 866 ifa->valid_lft = valid_lft;
867 ifa->prefered_lft = prefered_lft;
1da177e4 868 ifa->cstamp = ifa->tstamp = jiffies;
617fe29d 869 ifa->tokenized = false;
1da177e4 870
57f5f544
KF		 871 ifa->rt = rt;
872
1da177e4
LT		 873 ifa->idev = idev;
874 in6_dev_hold(idev);
875 /* For caller */
876 in6_ifa_hold(ifa);
877
878 /* Add to big hash table */
ddbe5032 879 hash = inet6_addr_hash(addr);
1da177e4 880
5c578aed 881 hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]);
5c578aed 882 spin_unlock(&addrconf_hash_lock);
1da177e4
LT		 883
884 write_lock(&idev->lock);
885 /* Add to inet6_dev unicast addr list. */
e55ffac6 886 ipv6_link_dev_addr(idev, ifa);
1da177e4 887
1da177e4 888 if (ifa->flags&IFA_F_TEMPORARY) {
372e6c8f 889 list_add(&ifa->tmp_list, &idev->tempaddr_list);
1da177e4
LT		 890 in6_ifa_hold(ifa);
891 }
1da177e4 892
1da177e4
LT		 893 in6_ifa_hold(ifa);
894 write_unlock(&idev->lock);
895out2:
8814c4b5 896 rcu_read_unlock_bh();
1da177e4 897
fd92833a 898 if (likely(err == 0))
f88c91dd 899 inet6addr_notifier_call_chain(NETDEV_UP, ifa);
1da177e4
LT		 900 else {
901 kfree(ifa);
902 ifa = ERR_PTR(err);
903 }
904
905 return ifa;
906out:
5c578aed 907 spin_unlock(&addrconf_hash_lock);
1da177e4
LT		 908 goto out2;
909}
910
5b84efec
TH		 911enum cleanup_prefix_rt_t {
912 CLEANUP_PREFIX_RT_NOP, /* no cleanup action for prefix route */
913 CLEANUP_PREFIX_RT_DEL, /* delete the prefix route */
914 CLEANUP_PREFIX_RT_EXPIRE, /* update the lifetime of the prefix route */
915};
916
917/*
918 * Check, whether the prefix for ifp would still need a prefix route
919 * after deleting ifp. The function returns one of the CLEANUP_PREFIX_RT_*
920 * constants.
921 *
922 * 1) we don't purge prefix if address was not permanent.
923 * prefix is managed by its own lifetime.
924 * 2) we also don't purge, if the address was IFA_F_NOPREFIXROUTE.
925 * 3) if there are no addresses, delete prefix.
926 * 4) if there are still other permanent address(es),
927 * corresponding prefix is still permanent.
928 * 5) if there are still other addresses with IFA_F_NOPREFIXROUTE,
929 * don't purge the prefix, assume user space is managing it.
930 * 6) otherwise, update prefix lifetime to the
931 * longest valid lifetime among the corresponding
932 * addresses on the device.
933 * Note: subsequent RA will update lifetime.
934 **/
935static enum cleanup_prefix_rt_t
936check_cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long *expires)
937{
938 struct inet6_ifaddr *ifa;
939 struct inet6_dev *idev = ifp->idev;
940 unsigned long lifetime;
941 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_DEL;
942
943 *expires = jiffies;
944
945 list_for_each_entry(ifa, &idev->addr_list, if_list) {
946 if (ifa == ifp)
947 continue;
948 if (!ipv6_prefix_equal(&ifa->addr, &ifp->addr,
949 ifp->prefix_len))
950 continue;
951 if (ifa->flags & (IFA_F_PERMANENT | IFA_F_NOPREFIXROUTE))
952 return CLEANUP_PREFIX_RT_NOP;
953
954 action = CLEANUP_PREFIX_RT_EXPIRE;
955
956 spin_lock(&ifa->lock);
957
958 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
959 /*
960 * Note: Because this address is
961 * not permanent, lifetime <
962 * LONG_MAX / HZ here.
963 */
964 if (time_before(*expires, ifa->tstamp + lifetime * HZ))
965 *expires = ifa->tstamp + lifetime * HZ;
966 spin_unlock(&ifa->lock);
967 }
968
969 return action;
970}
971
972static void
973cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long expires, bool del_rt)
974{
975 struct rt6_info *rt;
976
977 rt = addrconf_get_prefix_route(&ifp->addr,
978 ifp->prefix_len,
979 ifp->idev->dev,
980 0, RTF_GATEWAY | RTF_DEFAULT);
981 if (rt) {
982 if (del_rt)
983 ip6_del_rt(rt);
984 else {
985 if (!(rt->rt6i_flags & RTF_EXPIRES))
986 rt6_set_expires(rt, expires);
987 ip6_rt_put(rt);
988 }
989 }
990}
991
992
1da177e4
LT		 993/* This function wants to get referenced ifp and releases it before return */
994
995static void ipv6_del_addr(struct inet6_ifaddr *ifp)
996{
4c5ff6a6 997 int state;
5b84efec
TH		 998 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_NOP;
999 unsigned long expires;
1da177e4 1000
c15b1cca
HFS		 1001 ASSERT_RTNL();
1002
4c5ff6a6
HX		 1003 spin_lock_bh(&ifp->state_lock);
1004 state = ifp->state;
e9d3e084 1005 ifp->state = INET6_IFADDR_STATE_DEAD;
4c5ff6a6
HX		 1006 spin_unlock_bh(&ifp->state_lock);
1007
1008 if (state == INET6_IFADDR_STATE_DEAD)
1009 goto out;
1da177e4 1010
5c578aed 1011 spin_lock_bh(&addrconf_hash_lock);
1012 hlist_del_init_rcu(&ifp->addr_lst);
5c578aed 1013 spin_unlock_bh(&addrconf_hash_lock);
1da177e4 1014
5b84efec 1015 write_lock_bh(&ifp->idev->lock);
5d9efa7e 1016
1da177e4 1017 if (ifp->flags&IFA_F_TEMPORARY) {
372e6c8f 1018 list_del(&ifp->tmp_list);
1019 if (ifp->ifpub) {
1020 in6_ifa_put(ifp->ifpub);
1021 ifp->ifpub = NULL;
1da177e4 1022 }
372e6c8f 1023 __in6_ifa_put(ifp);
1da177e4 1024 }
1da177e4 1025
5b84efec
TH		 1026 if (ifp->flags & IFA_F_PERMANENT && !(ifp->flags & IFA_F_NOPREFIXROUTE))
1027 action = check_cleanup_prefix_route(ifp, &expires);
502a2ffd 1028
5b84efec
TH		 1029 list_del_init(&ifp->if_list);
1030 __in6_ifa_put(ifp);
1031
1032 write_unlock_bh(&ifp->idev->lock);
1da177e4 1033
c15b1cca 1034 addrconf_del_dad_work(ifp);
b2238566 1035
1da177e4
LT		 1036 ipv6_ifa_notify(RTM_DELADDR, ifp);
1037
f88c91dd 1038 inet6addr_notifier_call_chain(NETDEV_DOWN, ifp);
1da177e4 1039
5b84efec
TH		 1040 if (action != CLEANUP_PREFIX_RT_NOP) {
1041 cleanup_prefix_route(ifp, expires,
1042 action == CLEANUP_PREFIX_RT_DEL);
1da177e4
LT		 1043 }
1044
c3968a85
DW		 1045 /* clean up prefsrc entries */
1046 rt6_remove_prefsrc(ifp);
4c5ff6a6 1047out:
1da177e4
LT		 1048 in6_ifa_put(ifp);
1049}
1050
1da177e4
LT		 1051static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
1052{
1053 struct inet6_dev *idev = ifp->idev;
1054 struct in6_addr addr, *tmpaddr;
76f793e3 1055 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_tstamp, age;
eac55bf9 1056 unsigned long regen_advance;
1da177e4
LT		 1057 int tmp_plen;
1058 int ret = 0;
95c385b4 1059 u32 addr_flags;
76f793e3 1060 unsigned long now = jiffies;
1da177e4 1061
53bd6749 1062 write_lock_bh(&idev->lock);
1da177e4
LT		 1063 if (ift) {
1064 spin_lock_bh(&ift->lock);
1065 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
1066 spin_unlock_bh(&ift->lock);
1067 tmpaddr = &addr;
1068 } else {
1069 tmpaddr = NULL;
1070 }
1071retry:
1072 in6_dev_hold(idev);
1073 if (idev->cnf.use_tempaddr <= 0) {
53bd6749 1074 write_unlock_bh(&idev->lock);
f3213831 1075 pr_info("%s: use_tempaddr is disabled\n", __func__);
1da177e4
LT		 1076 in6_dev_put(idev);
1077 ret = -1;
1078 goto out;
1079 }
1080 spin_lock_bh(&ifp->lock);
1081 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
1082 idev->cnf.use_tempaddr = -1; /*XXX*/
1083 spin_unlock_bh(&ifp->lock);
53bd6749 1084 write_unlock_bh(&idev->lock);
f3213831
JP		 1085 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n",
1086 __func__);
1da177e4
LT		 1087 in6_dev_put(idev);
1088 ret = -1;
1089 goto out;
1090 }
1091 in6_ifa_hold(ifp);
1092 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
eb7e0575 1093 __ipv6_try_regen_rndid(idev, tmpaddr);
1da177e4 1094 memcpy(&addr.s6_addr[8], idev->rndid, 8);
76f793e3 1095 age = (now - ifp->tstamp) / HZ;
1da177e4
LT		 1096 tmp_valid_lft = min_t(__u32,
1097 ifp->valid_lft,
7a876b0e 1098 idev->cnf.temp_valid_lft + age);
1ab1457c
YH		 1099 tmp_prefered_lft = min_t(__u32,
1100 ifp->prefered_lft,
7a876b0e 1101 idev->cnf.temp_prefered_lft + age -
784e2710 1102 idev->cnf.max_desync_factor);
1da177e4 1103 tmp_plen = ifp->prefix_len;
1da177e4
LT		 1104 tmp_tstamp = ifp->tstamp;
1105 spin_unlock_bh(&ifp->lock);
1106
eac55bf9 1107 regen_advance = idev->cnf.regen_max_retry *
67ba4152
IM		 1108 idev->cnf.dad_transmits *
1109 NEIGH_VAR(idev->nd_parms, RETRANS_TIME) / HZ;
53bd6749 1110 write_unlock_bh(&idev->lock);
95c385b4 1111
eac55bf9
BB		 1112 /* A temporary address is created only if this calculated Preferred
1113 * Lifetime is greater than REGEN_ADVANCE time units. In particular,
1114 * an implementation must not create a temporary address with a zero
1115 * Preferred Lifetime.
ecab6701
HK		 1116 * Use age calculation as in addrconf_verify to avoid unnecessary
1117 * temporary addresses being generated.
eac55bf9 1118 */
ecab6701
HK		 1119 age = (now - tmp_tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
1120 if (tmp_prefered_lft <= regen_advance + age) {
eac55bf9
BB		 1121 in6_ifa_put(ifp);
1122 in6_dev_put(idev);
1123 ret = -1;
1124 goto out;
1125 }
1126
95c385b4
NH		 1127 addr_flags = IFA_F_TEMPORARY;
1128 /* set in addrconf_prefix_rcv() */
1129 if (ifp->flags & IFA_F_OPTIMISTIC)
1130 addr_flags |= IFA_F_OPTIMISTIC;
1131
4b08a8f1
HFS		 1132 ift = ipv6_add_addr(idev, &addr, NULL, tmp_plen,
1133 ipv6_addr_scope(&addr), addr_flags,
1134 tmp_valid_lft, tmp_prefered_lft);
1135 if (IS_ERR(ift)) {
1da177e4
LT		 1136 in6_ifa_put(ifp);
1137 in6_dev_put(idev);
f3213831 1138 pr_info("%s: retry temporary address regeneration\n", __func__);
1da177e4 1139 tmpaddr = &addr;
53bd6749 1140 write_lock_bh(&idev->lock);
1da177e4
LT		 1141 goto retry;
1142 }
1143
1144 spin_lock_bh(&ift->lock);
1145 ift->ifpub = ifp;
76f793e3 1146 ift->cstamp = now;
1da177e4
LT		 1147 ift->tstamp = tmp_tstamp;
1148 spin_unlock_bh(&ift->lock);
1149
cf22f9a2 1150 addrconf_dad_start(ift);
1da177e4
LT		 1151 in6_ifa_put(ift);
1152 in6_dev_put(idev);
1153out:
1154 return ret;
1155}
1da177e4
LT		 1156
1157/*
072047e4 1158 * Choose an appropriate source address (RFC3484)
1da177e4 1159 */
a9b05723
YH		 1160enum {
1161 IPV6_SADDR_RULE_INIT = 0,
1162 IPV6_SADDR_RULE_LOCAL,
1163 IPV6_SADDR_RULE_SCOPE,
1164 IPV6_SADDR_RULE_PREFERRED,
1165#ifdef CONFIG_IPV6_MIP6
1166 IPV6_SADDR_RULE_HOA,
1167#endif
1168 IPV6_SADDR_RULE_OIF,
1169 IPV6_SADDR_RULE_LABEL,
a9b05723 1170 IPV6_SADDR_RULE_PRIVACY,
a9b05723
YH		 1171 IPV6_SADDR_RULE_ORCHID,
1172 IPV6_SADDR_RULE_PREFIX,
7fd2561e
EK		 1173#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1174 IPV6_SADDR_RULE_NOT_OPTIMISTIC,
1175#endif
a9b05723
YH		 1176 IPV6_SADDR_RULE_MAX
1177};
1178
072047e4 1179struct ipv6_saddr_score {
a9b05723
YH		 1180 int rule;
1181 int addr_type;
1182 struct inet6_ifaddr *ifa;
1183 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
1184 int scopedist;
1185 int matchlen;
072047e4
YH		 1186};
1187
a9b05723 1188struct ipv6_saddr_dst {
9acd9f3a 1189 const struct in6_addr *addr;
a9b05723
YH		 1190 int ifindex;
1191 int scope;
1192 int label;
7cbca67c 1193 unsigned int prefs;
a9b05723 1194};
072047e4 1195
b6f99a21 1196static inline int ipv6_saddr_preferred(int type)
1da177e4 1197{
45bb0060 1198 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
072047e4
YH		 1199 return 1;
1200 return 0;
1da177e4
LT		 1201}
1202
7fd2561e
EK		 1203static inline bool ipv6_use_optimistic_addr(struct inet6_dev *idev)
1204{
1205#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1206 return idev && idev->cnf.optimistic_dad && idev->cnf.use_optimistic;
1207#else
1208 return false;
1209#endif
1210}
1211
3de23255
BT		 1212static int ipv6_get_saddr_eval(struct net *net,
1213 struct ipv6_saddr_score *score,
a9b05723
YH		 1214 struct ipv6_saddr_dst *dst,
1215 int i)
1216{
1217 int ret;
1218
1219 if (i <= score->rule) {
1220 switch (i) {
1221 case IPV6_SADDR_RULE_SCOPE:
1222 ret = score->scopedist;
1223 break;
1224 case IPV6_SADDR_RULE_PREFIX:
1225 ret = score->matchlen;
1226 break;
1227 default:
1228 ret = !!test_bit(i, score->scorebits);
1229 }
1230 goto out;
1231 }
1232
1233 switch (i) {
1234 case IPV6_SADDR_RULE_INIT:
1235 /* Rule 0: remember if hiscore is not ready yet */
1236 ret = !!score->ifa;
1237 break;
1238 case IPV6_SADDR_RULE_LOCAL:
1239 /* Rule 1: Prefer same address */
1240 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1241 break;
1242 case IPV6_SADDR_RULE_SCOPE:
1243 /* Rule 2: Prefer appropriate scope
1244 *
1245 * ret
1246 * ^
1247 * -1 | d 15
1248 * ---+--+-+---> scope
1249 * |
1250 * | d is scope of the destination.
1251 * B-d | \
1252 * | \ <- smaller scope is better if
db9c7c39 1253 * B-15 | \ if scope is enough for destination.
a9b05723
YH		 1254 * | ret = B - scope (-1 <= scope >= d <= 15).
1255 * d-C-1 | /
1256 * |/ <- greater is better
1257 * -C / if scope is not enough for destination.
1258 * /| ret = scope - C (-1 <= d < scope <= 15).
1259 *
1260 * d - C - 1 < B -15 (for all -1 <= d <= 15).
1261 * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1262 * Assume B = 0 and we get C > 29.
1263 */
1264 ret = __ipv6_addr_src_scope(score->addr_type);
1265 if (ret >= dst->scope)
1266 ret = -ret;
1267 else
1268 ret -= 128; /* 30 is enough */
1269 score->scopedist = ret;
1270 break;
1271 case IPV6_SADDR_RULE_PREFERRED:
7fd2561e 1272 {
a9b05723 1273 /* Rule 3: Avoid deprecated and optimistic addresses */
7fd2561e
EK		 1274 u8 avoid = IFA_F_DEPRECATED;
1275
1276 if (!ipv6_use_optimistic_addr(score->ifa->idev))
1277 avoid |= IFA_F_OPTIMISTIC;
a9b05723 1278 ret = ipv6_saddr_preferred(score->addr_type) ||
7fd2561e 1279 !(score->ifa->flags & avoid);
a9b05723 1280 break;
7fd2561e 1281 }
a9b05723
YH		 1282#ifdef CONFIG_IPV6_MIP6
1283 case IPV6_SADDR_RULE_HOA:
7cbca67c 1284 {
a9b05723 1285 /* Rule 4: Prefer home address */
7cbca67c
YH		 1286 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1287 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
a9b05723 1288 break;
7cbca67c 1289 }
a9b05723
YH		 1290#endif
1291 case IPV6_SADDR_RULE_OIF:
1292 /* Rule 5: Prefer outgoing interface */
1293 ret = (!dst->ifindex ||
1294 dst->ifindex == score->ifa->idev->dev->ifindex);
1295 break;
1296 case IPV6_SADDR_RULE_LABEL:
1297 /* Rule 6: Prefer matching label */
3de23255
BT		 1298 ret = ipv6_addr_label(net,
1299 &score->ifa->addr, score->addr_type,
a9b05723
YH		 1300 score->ifa->idev->dev->ifindex) == dst->label;
1301 break;
a9b05723 1302 case IPV6_SADDR_RULE_PRIVACY:
7cbca67c 1303 {
a9b05723 1304 /* Rule 7: Prefer public address
25985edc 1305 * Note: prefer temporary address if use_tempaddr >= 2
a9b05723 1306 */
7cbca67c
YH		 1307 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1308 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1309 score->ifa->idev->cnf.use_tempaddr >= 2;
1310 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
a9b05723 1311 break;
7cbca67c 1312 }
a9b05723
YH		 1313 case IPV6_SADDR_RULE_ORCHID:
1314 /* Rule 8-: Prefer ORCHID vs ORCHID or
1315 * non-ORCHID vs non-ORCHID
1316 */
1317 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1318 ipv6_addr_orchid(dst->addr));
1319 break;
1320 case IPV6_SADDR_RULE_PREFIX:
1321 /* Rule 8: Use longest matching prefix */
91b4b04f
YH		 1322 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr);
1323 if (ret > score->ifa->prefix_len)
1324 ret = score->ifa->prefix_len;
1325 score->matchlen = ret;
a9b05723 1326 break;
7fd2561e
EK		 1327#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1328 case IPV6_SADDR_RULE_NOT_OPTIMISTIC:
1329 /* Optimistic addresses still have lower precedence than other
1330 * preferred addresses.
1331 */
1332 ret = !(score->ifa->flags & IFA_F_OPTIMISTIC);
1333 break;
1334#endif
a9b05723
YH		 1335 default:
1336 ret = 0;
1337 }
1338
1339 if (ret)
1340 __set_bit(i, score->scorebits);
1341 score->rule = i;
1342out:
1343 return ret;
1344}
1345
b3f644fc 1346int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev,
9acd9f3a 1347 const struct in6_addr *daddr, unsigned int prefs,
7cbca67c 1348 struct in6_addr *saddr)
1da177e4 1349{
a9b05723
YH		 1350 struct ipv6_saddr_score scores[2],
1351 *score = &scores[0], *hiscore = &scores[1];
a9b05723 1352 struct ipv6_saddr_dst dst;
072047e4 1353 struct net_device *dev;
a9b05723 1354 int dst_type;
1da177e4 1355
a9b05723
YH		 1356 dst_type = __ipv6_addr_type(daddr);
1357 dst.addr = daddr;
1358 dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1359 dst.scope = __ipv6_addr_src_scope(dst_type);
3de23255 1360 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
7cbca67c 1361 dst.prefs = prefs;
a9b05723
YH		 1362
1363 hiscore->rule = -1;
1364 hiscore->ifa = NULL;
1da177e4 1365
8814c4b5 1366 rcu_read_lock();
1da177e4 1367
c6d14c84 1368 for_each_netdev_rcu(net, dev) {
072047e4 1369 struct inet6_dev *idev;
072047e4 1370
a9b05723 1371 /* Candidate Source Address (section 4)
072047e4
YH		 1372 * - multicast and link-local destination address,
1373 * the set of candidate source address MUST only
1374 * include addresses assigned to interfaces
1375 * belonging to the same link as the outgoing
1376 * interface.
1377 * (- For site-local destination addresses, the
1378 * set of candidate source addresses MUST only
1379 * include addresses assigned to interfaces
1380 * belonging to the same site as the outgoing
1381 * interface.)
1382 */
a9b05723
YH		 1383 if (((dst_type & IPV6_ADDR_MULTICAST) ||
1384 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL) &&
1385 dst.ifindex && dev->ifindex != dst.ifindex)
072047e4 1386 continue;
1da177e4 1387
1da177e4 1388 idev = __in6_dev_get(dev);
072047e4
YH		 1389 if (!idev)
1390 continue;
1391
1392 read_lock_bh(&idev->lock);
502a2ffd 1393 list_for_each_entry(score->ifa, &idev->addr_list, if_list) {
a9b05723 1394 int i;
072047e4 1395
a9b05723 1396 /*
6b3ae80a
YH		 1397 * - Tentative Address (RFC2462 section 5.4)
1398 * - A tentative address is not considered
1399 * "assigned to an interface" in the traditional
95c385b4 1400 * sense, unless it is also flagged as optimistic.
6b3ae80a 1401 * - Candidate Source Address (section 4)
072047e4
YH		 1402 * - In any case, anycast addresses, multicast
1403 * addresses, and the unspecified address MUST
1404 * NOT be included in a candidate set.
1405 */
a9b05723
YH		 1406 if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1407 (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
6b3ae80a 1408 continue;
a9b05723
YH		 1409
1410 score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1411
1412 if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1413 score->addr_type & IPV6_ADDR_MULTICAST)) {
ba7a46f1
JP		 1414 net_dbg_ratelimited("ADDRCONF: unspecified / multicast address assigned as unicast address on %s",
1415 dev->name);
072047e4
YH		 1416 continue;
1417 }
1418
a9b05723
YH		 1419 score->rule = -1;
1420 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1421
1422 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1423 int minihiscore, miniscore;
1424
3de23255
BT		 1425 minihiscore = ipv6_get_saddr_eval(net, hiscore, &dst, i);
1426 miniscore = ipv6_get_saddr_eval(net, score, &dst, i);
a9b05723
YH		 1427
1428 if (minihiscore > miniscore) {
1429 if (i == IPV6_SADDR_RULE_SCOPE &&
1430 score->scopedist > 0) {
1431 /*
1432 * special case:
1433 * each remaining entry
1434 * has too small (not enough)
1435 * scope, because ifa entries
1436 * are sorted by their scope
1437 * values.
1438 */
1439 goto try_nextdev;
1440 }
1441 break;
1442 } else if (minihiscore < miniscore) {
a9b05723
YH		 1443 if (hiscore->ifa)
1444 in6_ifa_put(hiscore->ifa);
1445
1446 in6_ifa_hold(score->ifa);
1447
a0bffffc 1448 swap(hiscore, score);
a9b05723
YH		 1449
1450 /* restore our iterator */
1451 score->ifa = hiscore->ifa;
1452
1453 break;
1da177e4 1454 }
072047e4 1455 }
1da177e4 1456 }
a9b05723 1457try_nextdev:
072047e4 1458 read_unlock_bh(&idev->lock);
1da177e4 1459 }
8814c4b5 1460 rcu_read_unlock();
1da177e4 1461
a9b05723 1462 if (!hiscore->ifa)
072047e4 1463 return -EADDRNOTAVAIL;
1ab1457c 1464
4e3fd7a0 1465 *saddr = hiscore->ifa->addr;
a9b05723 1466 in6_ifa_put(hiscore->ifa);
072047e4 1467 return 0;
1da177e4 1468}
5e5f3f0f 1469EXPORT_SYMBOL(ipv6_dev_get_saddr);
1da177e4 1470
8965779d 1471int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr,
479840ff 1472 u32 banned_flags)
b7b1bfce
HFS		 1473{
1474 struct inet6_ifaddr *ifp;
1475 int err = -EADDRNOTAVAIL;
1476
602582ca
HFS		 1477 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
1478 if (ifp->scope > IFA_LINK)
1479 break;
b7b1bfce
HFS		 1480 if (ifp->scope == IFA_LINK &&
1481 !(ifp->flags & banned_flags)) {
1482 *addr = ifp->addr;
1483 err = 0;
1484 break;
1485 }
1486 }
1487 return err;
1488}
1489
95c385b4 1490int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
479840ff 1491 u32 banned_flags)
1da177e4
LT		 1492{
1493 struct inet6_dev *idev;
1494 int err = -EADDRNOTAVAIL;
1495
8814c4b5 1496 rcu_read_lock();
e21e8467
SH		 1497 idev = __in6_dev_get(dev);
1498 if (idev) {
1da177e4 1499 read_lock_bh(&idev->lock);
b7b1bfce 1500 err = __ipv6_get_lladdr(idev, addr, banned_flags);
1da177e4
LT		 1501 read_unlock_bh(&idev->lock);
1502 }
8814c4b5 1503 rcu_read_unlock();
1da177e4
LT		 1504 return err;
1505}
1506
1507static int ipv6_count_addresses(struct inet6_dev *idev)
1508{
1509 int cnt = 0;
1510 struct inet6_ifaddr *ifp;
1511
1512 read_lock_bh(&idev->lock);
502a2ffd 1513 list_for_each_entry(ifp, &idev->addr_list, if_list)
1da177e4
LT		 1514 cnt++;
1515 read_unlock_bh(&idev->lock);
1516 return cnt;
1517}
1518
b71d1d42 1519int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
2a7851bf 1520 const struct net_device *dev, int strict)
1da177e4 1521{
eedf042a 1522 struct inet6_ifaddr *ifp;
ddbe5032 1523 unsigned int hash = inet6_addr_hash(addr);
1da177e4 1524
5c578aed 1525 rcu_read_lock_bh();
b67bfe0d 1526 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
878628fb 1527 if (!net_eq(dev_net(ifp->idev->dev), net))
bfeade08 1528 continue;
1da177e4 1529 if (ipv6_addr_equal(&ifp->addr, addr) &&
eedf042a
SH		 1530 !(ifp->flags&IFA_F_TENTATIVE) &&
1531 (dev == NULL || ifp->idev->dev == dev ||
1532 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) {
1533 rcu_read_unlock_bh();
1534 return 1;
1da177e4
LT		 1535 }
1536 }
5c578aed 1537
eedf042a
SH		 1538 rcu_read_unlock_bh();
1539 return 0;
1da177e4 1540}
7159039a
YH		 1541EXPORT_SYMBOL(ipv6_chk_addr);
1542
3e81c6da
DM		 1543static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1544 struct net_device *dev)
1da177e4 1545{
ddbe5032 1546 unsigned int hash = inet6_addr_hash(addr);
c2e21293 1547 struct inet6_ifaddr *ifp;
1da177e4 1548
b67bfe0d 1549 hlist_for_each_entry(ifp, &inet6_addr_lst[hash], addr_lst) {
878628fb 1550 if (!net_eq(dev_net(ifp->idev->dev), net))
06bfe655 1551 continue;
1da177e4
LT		 1552 if (ipv6_addr_equal(&ifp->addr, addr)) {
1553 if (dev == NULL || ifp->idev->dev == dev)
3e81c6da 1554 return true;
1da177e4
LT		 1555 }
1556 }
3e81c6da 1557 return false;
1da177e4
LT		 1558}
1559
7df37ff3
CB		 1560/* Compares an address/prefix_len with addresses on device @dev.
1561 * If one is found it returns true.
1562 */
1563bool ipv6_chk_custom_prefix(const struct in6_addr *addr,
1564 const unsigned int prefix_len, struct net_device *dev)
1565{
1566 struct inet6_dev *idev;
1567 struct inet6_ifaddr *ifa;
1568 bool ret = false;
1569
1570 rcu_read_lock();
1571 idev = __in6_dev_get(dev);
1572 if (idev) {
1573 read_lock_bh(&idev->lock);
1574 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1575 ret = ipv6_prefix_equal(addr, &ifa->addr, prefix_len);
1576 if (ret)
1577 break;
1578 }
1579 read_unlock_bh(&idev->lock);
1580 }
1581 rcu_read_unlock();
1582
1583 return ret;
1584}
1585EXPORT_SYMBOL(ipv6_chk_custom_prefix);
1586
b71d1d42 1587int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev)
52eeeb84
YH		 1588{
1589 struct inet6_dev *idev;
1590 struct inet6_ifaddr *ifa;
1591 int onlink;
1592
1593 onlink = 0;
1594 rcu_read_lock();
1595 idev = __in6_dev_get(dev);
1596 if (idev) {
1597 read_lock_bh(&idev->lock);
502a2ffd 1598 list_for_each_entry(ifa, &idev->addr_list, if_list) {
52eeeb84
YH		 1599 onlink = ipv6_prefix_equal(addr, &ifa->addr,
1600 ifa->prefix_len);
1601 if (onlink)
1602 break;
1603 }
1604 read_unlock_bh(&idev->lock);
1605 }
1606 rcu_read_unlock();
1607 return onlink;
1608}
52eeeb84
YH		 1609EXPORT_SYMBOL(ipv6_chk_prefix);
1610
9acd9f3a 1611struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1cab3da6 1612 struct net_device *dev, int strict)
1da177e4 1613{
b79d1d54 1614 struct inet6_ifaddr *ifp, *result = NULL;
ddbe5032 1615 unsigned int hash = inet6_addr_hash(addr);
1da177e4 1616
5c578aed 1617 rcu_read_lock_bh();
b67bfe0d 1618 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
878628fb 1619 if (!net_eq(dev_net(ifp->idev->dev), net))
1cab3da6 1620 continue;
1da177e4
LT		 1621 if (ipv6_addr_equal(&ifp->addr, addr)) {
1622 if (dev == NULL || ifp->idev->dev == dev ||
1623 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
b79d1d54 1624 result = ifp;
1da177e4
LT		 1625 in6_ifa_hold(ifp);
1626 break;
1627 }
1628 }
1629 }
5c578aed 1630 rcu_read_unlock_bh();
1da177e4 1631
b79d1d54 1632 return result;
1da177e4
LT		 1633}
1634
1da177e4
LT		 1635/* Gets referenced address, destroys ifaddr */
1636
cc411d0b 1637static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
1da177e4 1638{
1da177e4
LT		 1639 if (ifp->flags&IFA_F_PERMANENT) {
1640 spin_lock_bh(&ifp->lock);
c15b1cca 1641 addrconf_del_dad_work(ifp);
1da177e4 1642 ifp->flags |= IFA_F_TENTATIVE;
cc411d0b
BH		 1643 if (dad_failed)
1644 ifp->flags |= IFA_F_DADFAILED;
1da177e4 1645 spin_unlock_bh(&ifp->lock);
e2577a06
HX		 1646 if (dad_failed)
1647 ipv6_ifa_notify(0, ifp);
1da177e4 1648 in6_ifa_put(ifp);
1da177e4
LT		 1649 } else if (ifp->flags&IFA_F_TEMPORARY) {
1650 struct inet6_ifaddr *ifpub;
1651 spin_lock_bh(&ifp->lock);
1652 ifpub = ifp->ifpub;
1653 if (ifpub) {
1654 in6_ifa_hold(ifpub);
1655 spin_unlock_bh(&ifp->lock);
1656 ipv6_create_tempaddr(ifpub, ifp);
1657 in6_ifa_put(ifpub);
1658 } else {
1659 spin_unlock_bh(&ifp->lock);
1660 }
1661 ipv6_del_addr(ifp);
c15b1cca 1662 } else {
1da177e4 1663 ipv6_del_addr(ifp);
c15b1cca 1664 }
1da177e4
LT		 1665}
1666
f2344a13
HX		 1667static int addrconf_dad_end(struct inet6_ifaddr *ifp)
1668{
1669 int err = -ENOENT;
1670
c15b1cca 1671 spin_lock_bh(&ifp->state_lock);
f2344a13
HX		 1672 if (ifp->state == INET6_IFADDR_STATE_DAD) {
1673 ifp->state = INET6_IFADDR_STATE_POSTDAD;
1674 err = 0;
1675 }
c15b1cca 1676 spin_unlock_bh(&ifp->state_lock);
f2344a13
HX		 1677
1678 return err;
1679}
1680
3c21edbd
YH		 1681void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1682{
1b34be74 1683 struct inet6_dev *idev = ifp->idev;
9bdd8d40 1684
853dc2e0
UB		 1685 if (addrconf_dad_end(ifp)) {
1686 in6_ifa_put(ifp);
f2344a13 1687 return;
853dc2e0 1688 }
f2344a13 1689
e87cc472
JP		 1690 net_info_ratelimited("%s: IPv6 duplicate address %pI6c detected!\n",
1691 ifp->idev->dev->name, &ifp->addr);
9bdd8d40 1692
1b34be74
YH		 1693 if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6) {
1694 struct in6_addr addr;
1695
1696 addr.s6_addr32[0] = htonl(0xfe800000);
1697 addr.s6_addr32[1] = 0;
1698
1699 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
1700 ipv6_addr_equal(&ifp->addr, &addr)) {
1701 /* DAD failed for link-local based on MAC address */
1702 idev->cnf.disable_ipv6 = 1;
9bdd8d40 1703
f3213831 1704 pr_info("%s: IPv6 being disabled!\n",
9bdd8d40 1705 ifp->idev->dev->name);
1b34be74
YH		 1706 }
1707 }
1708
c15b1cca
HFS		 1709 spin_lock_bh(&ifp->state_lock);
1710 /* transition from _POSTDAD to _ERRDAD */
1711 ifp->state = INET6_IFADDR_STATE_ERRDAD;
1712 spin_unlock_bh(&ifp->state_lock);
1713
1714 addrconf_mod_dad_work(ifp, 0);
3c21edbd 1715}
1da177e4 1716
a9ed4a29
SD		 1717/* Join to solicited addr multicast group.
1718 * caller must hold RTNL */
b71d1d42 1719void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr)
1da177e4
LT		 1720{
1721 struct in6_addr maddr;
1722
1723 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1724 return;
1725
1726 addrconf_addr_solict_mult(addr, &maddr);
1727 ipv6_dev_mc_inc(dev, &maddr);
1728}
1729
a9ed4a29 1730/* caller must hold RTNL */
b71d1d42 1731void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr)
1da177e4
LT		 1732{
1733 struct in6_addr maddr;
1734
1735 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1736 return;
1737
1738 addrconf_addr_solict_mult(addr, &maddr);
1739 __ipv6_dev_mc_dec(idev, &maddr);
1740}
1741
a9ed4a29 1742/* caller must hold RTNL */
20380731 1743static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1da177e4
LT		 1744{
1745 struct in6_addr addr;
c15b1cca 1746
88ad3149 1747 if (ifp->prefix_len >= 127) /* RFC 6164 */
2bda8a0c 1748 return;
1da177e4
LT		 1749 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1750 if (ipv6_addr_any(&addr))
1751 return;
013b4d90 1752 __ipv6_dev_ac_inc(ifp->idev, &addr);
1da177e4
LT		 1753}
1754
a9ed4a29 1755/* caller must hold RTNL */
20380731 1756static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1da177e4
LT		 1757{
1758 struct in6_addr addr;
c15b1cca 1759
88ad3149 1760 if (ifp->prefix_len >= 127) /* RFC 6164 */
32019e65 1761 return;
1da177e4
LT		 1762 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1763 if (ipv6_addr_any(&addr))
1764 return;
1765 __ipv6_dev_ac_dec(ifp->idev, &addr);
1766}
1767
073a8e0e
YH		 1768static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
1769{
1770 if (dev->addr_len != ETH_ALEN)
1771 return -1;
1772 memcpy(eui, dev->dev_addr, 3);
1773 memcpy(eui + 5, dev->dev_addr + 3, 3);
1774
1775 /*
1776 * The zSeries OSA network cards can be shared among various
1777 * OS instances, but the OSA cards have only one MAC address.
1778 * This leads to duplicate address conflicts in conjunction
1779 * with IPv6 if more than one instance uses the same card.
1780 *
1781 * The driver for these cards can deliver a unique 16-bit
1782 * identifier for each instance sharing the same card. It is
1783 * placed instead of 0xFFFE in the interface identifier. The
1784 * "u" bit of the interface identifier is not inverted in this
1785 * case. Hence the resulting interface identifier has local
1786 * scope according to RFC2373.
1787 */
1788 if (dev->dev_id) {
1789 eui[3] = (dev->dev_id >> 8) & 0xFF;
1790 eui[4] = dev->dev_id & 0xFF;
1791 } else {
1792 eui[3] = 0xFF;
1793 eui[4] = 0xFE;
1794 eui[0] ^= 2;
1795 }
1796 return 0;
1797}
1798
06a4c1c5 1799static int addrconf_ifid_eui64(u8 *eui, struct net_device *dev)
1800{
1801 if (dev->addr_len != IEEE802154_ADDR_LEN)
1802 return -1;
1803 memcpy(eui, dev->dev_addr, 8);
5e98a36e 1804 eui[0] ^= 2;
06a4c1c5 1805 return 0;
1806}
1807
cb6bf355
YH		 1808static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev)
1809{
1810 union fwnet_hwaddr *ha;
1811
1812 if (dev->addr_len != FWNET_ALEN)
1813 return -1;
1814
1815 ha = (union fwnet_hwaddr *)dev->dev_addr;
1816
1817 memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id));
1818 eui[0] ^= 2;
1819 return 0;
1820}
1821
073a8e0e
YH		 1822static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1823{
1824 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1825 if (dev->addr_len != ARCNET_ALEN)
1826 return -1;
1827 memset(eui, 0, 7);
8e5e8f30 1828 eui[7] = *(u8 *)dev->dev_addr;
073a8e0e
YH		 1829 return 0;
1830}
1831
1832static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1833{
1834 if (dev->addr_len != INFINIBAND_ALEN)
1835 return -1;
1836 memcpy(eui, dev->dev_addr + 12, 8);
1837 eui[0] |= 2;
1838 return 0;
1839}
1840
c61393ea 1841static int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
dfd982ba 1842{
9af28511
SH		 1843 if (addr == 0)
1844 return -1;
dfd982ba
YH		 1845 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
1846 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
1847 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
1848 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
1849 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
1850 ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
1851 eui[1] = 0;
1852 eui[2] = 0x5E;
1853 eui[3] = 0xFE;
1854 memcpy(eui + 4, &addr, 4);
1855 return 0;
1856}
dfd982ba
YH		 1857
1858static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
1859{
1860 if (dev->priv_flags & IFF_ISATAP)
1861 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1862 return -1;
1863}
1864
aee80b54 1865static int addrconf_ifid_gre(u8 *eui, struct net_device *dev)
1866{
1867 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1868}
1869
e837735e
ND		 1870static int addrconf_ifid_ip6tnl(u8 *eui, struct net_device *dev)
1871{
1872 memcpy(eui, dev->perm_addr, 3);
1873 memcpy(eui + 5, dev->perm_addr + 3, 3);
1874 eui[3] = 0xFF;
1875 eui[4] = 0xFE;
1876 eui[0] ^= 2;
1877 return 0;
1878}
1879
1da177e4
LT		 1880static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1881{
1882 switch (dev->type) {
1883 case ARPHRD_ETHER:
1884 case ARPHRD_FDDI:
073a8e0e 1885 return addrconf_ifid_eui48(eui, dev);
1da177e4 1886 case ARPHRD_ARCNET:
073a8e0e 1887 return addrconf_ifid_arcnet(eui, dev);
1da177e4 1888 case ARPHRD_INFINIBAND:
073a8e0e 1889 return addrconf_ifid_infiniband(eui, dev);
c7dc89c0 1890 case ARPHRD_SIT:
dfd982ba 1891 return addrconf_ifid_sit(eui, dev);
aee80b54 1892 case ARPHRD_IPGRE:
1893 return addrconf_ifid_gre(eui, dev);
e74bccb8 1894 case ARPHRD_6LOWPAN:
06a4c1c5 1895 case ARPHRD_IEEE802154:
1896 return addrconf_ifid_eui64(eui, dev);
cb6bf355
YH		 1897 case ARPHRD_IEEE1394:
1898 return addrconf_ifid_ieee1394(eui, dev);
e837735e
ND		 1899 case ARPHRD_TUNNEL6:
1900 return addrconf_ifid_ip6tnl(eui, dev);
1da177e4
LT		 1901 }
1902 return -1;
1903}
1904
1905static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1906{
1907 int err = -1;
1908 struct inet6_ifaddr *ifp;
1909
1910 read_lock_bh(&idev->lock);
602582ca
HFS		 1911 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
1912 if (ifp->scope > IFA_LINK)
1913 break;
1da177e4
LT		 1914 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1915 memcpy(eui, ifp->addr.s6_addr+8, 8);
1916 err = 0;
1917 break;
1918 }
1919 }
1920 read_unlock_bh(&idev->lock);
1921 return err;
1922}
1923
1da177e4 1924/* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
eb7e0575 1925static void __ipv6_regen_rndid(struct inet6_dev *idev)
1da177e4 1926{
1da177e4 1927regen:
955189ef 1928 get_random_bytes(idev->rndid, sizeof(idev->rndid));
1da177e4 1929 idev->rndid[0] &= ~0x02;
1da177e4
LT		 1930
1931 /*
1932 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1933 * check if generated address is not inappropriate
1934 *
1935 * - Reserved subnet anycast (RFC 2526)
1936 * 11111101 11....11 1xxxxxxx
c7dc89c0 1937 * - ISATAP (RFC4214) 6.1
1da177e4
LT		 1938 * 00-00-5E-FE-xx-xx-xx-xx
1939 * - value 0
1940 * - XXX: already assigned to an address on the device
1941 */
1ab1457c 1942 if (idev->rndid[0] == 0xfd &&
1da177e4
LT		 1943 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1944 (idev->rndid[7]&0x80))
1945 goto regen;
1946 if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1947 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1948 goto regen;
1949 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1950 goto regen;
1951 }
1da177e4
LT		 1952}
1953
1954static void ipv6_regen_rndid(unsigned long data)
1955{
1956 struct inet6_dev *idev = (struct inet6_dev *) data;
1957 unsigned long expires;
1958
8814c4b5 1959 rcu_read_lock_bh();
1da177e4
LT		 1960 write_lock_bh(&idev->lock);
1961
1962 if (idev->dead)
1963 goto out;
1964
eb7e0575 1965 __ipv6_regen_rndid(idev);
1ab1457c 1966
1da177e4 1967 expires = jiffies +
1ab1457c 1968 idev->cnf.temp_prefered_lft * HZ -
1f9248e5
JP		 1969 idev->cnf.regen_max_retry * idev->cnf.dad_transmits *
1970 NEIGH_VAR(idev->nd_parms, RETRANS_TIME) -
784e2710 1971 idev->cnf.max_desync_factor * HZ;
1da177e4 1972 if (time_before(expires, jiffies)) {
f3213831
JP		 1973 pr_warn("%s: too short regeneration interval; timer disabled for %s\n",
1974 __func__, idev->dev->name);
1da177e4
LT		 1975 goto out;
1976 }
1977
1978 if (!mod_timer(&idev->regen_timer, expires))
1979 in6_dev_hold(idev);
1980
1981out:
1982 write_unlock_bh(&idev->lock);
8814c4b5 1983 rcu_read_unlock_bh();
1da177e4
LT		 1984 in6_dev_put(idev);
1985}
1986
eb7e0575 1987static void __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr)
8e5e8f30 1988{
1da177e4 1989 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
eb7e0575 1990 __ipv6_regen_rndid(idev);
1da177e4 1991}
1da177e4
LT		 1992
1993/*
1994 * Add prefix route.
1995 */
1996
1997static void
1998addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
e431b8c0 1999 unsigned long expires, u32 flags)
1da177e4 2000{
86872cb5
TG		 2001 struct fib6_config cfg = {
2002 .fc_table = RT6_TABLE_PREFIX,
2003 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2004 .fc_ifindex = dev->ifindex,
2005 .fc_expires = expires,
2006 .fc_dst_len = plen,
2007 .fc_flags = RTF_UP | flags,
c346dca1 2008 .fc_nlinfo.nl_net = dev_net(dev),
f410a1fb 2009 .fc_protocol = RTPROT_KERNEL,
86872cb5 2010 };
1da177e4 2011
4e3fd7a0 2012 cfg.fc_dst = *pfx;
1da177e4
LT		 2013
2014 /* Prevent useless cloning on PtP SIT.
2015 This thing is done here expecting that the whole
2016 class of non-broadcast devices need not cloning.
2017 */
07a93626 2018#if IS_ENABLED(CONFIG_IPV6_SIT)
86872cb5
TG		 2019 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
2020 cfg.fc_flags |= RTF_NONEXTHOP;
0be669bb 2021#endif
1da177e4 2022
86872cb5 2023 ip6_route_add(&cfg);
1da177e4
LT		 2024}
2025
14ef37b6
AH		 2026
2027static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
2028 int plen,
2029 const struct net_device *dev,
2030 u32 flags, u32 noflags)
2031{
2032 struct fib6_node *fn;
2033 struct rt6_info *rt = NULL;
2034 struct fib6_table *table;
2035
2036 table = fib6_get_table(dev_net(dev), RT6_TABLE_PREFIX);
2037 if (table == NULL)
2038 return NULL;
2039
5744dd9b 2040 read_lock_bh(&table->tb6_lock);
14ef37b6
AH		 2041 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0);
2042 if (!fn)
2043 goto out;
2044 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
d1918542 2045 if (rt->dst.dev->ifindex != dev->ifindex)
14ef37b6
AH		 2046 continue;
2047 if ((rt->rt6i_flags & flags) != flags)
2048 continue;
85da53bf 2049 if ((rt->rt6i_flags & noflags) != 0)
14ef37b6
AH		 2050 continue;
2051 dst_hold(&rt->dst);
2052 break;
2053 }
2054out:
5744dd9b 2055 read_unlock_bh(&table->tb6_lock);
14ef37b6
AH		 2056 return rt;
2057}
2058
2059
1da177e4
LT		 2060/* Create "default" multicast route to the interface */
2061
2062static void addrconf_add_mroute(struct net_device *dev)
2063{
86872cb5
TG		 2064 struct fib6_config cfg = {
2065 .fc_table = RT6_TABLE_LOCAL,
2066 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2067 .fc_ifindex = dev->ifindex,
2068 .fc_dst_len = 8,
2069 .fc_flags = RTF_UP,
c346dca1 2070 .fc_nlinfo.nl_net = dev_net(dev),
86872cb5
TG		 2071 };
2072
2073 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
2074
2075 ip6_route_add(&cfg);
1da177e4
LT		 2076}
2077
1da177e4
LT		 2078static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
2079{
2080 struct inet6_dev *idev;
2081
2082 ASSERT_RTNL();
2083
e21e8467
SH		 2084 idev = ipv6_find_idev(dev);
2085 if (!idev)
64e724f6
BH		 2086 return ERR_PTR(-ENOBUFS);
2087
2088 if (idev->cnf.disable_ipv6)
2089 return ERR_PTR(-EACCES);
1da177e4
LT		 2090
2091 /* Add default multicast route */
4af04aba
LW		 2092 if (!(dev->flags & IFF_LOOPBACK))
2093 addrconf_add_mroute(dev);
1da177e4 2094
1da177e4
LT		 2095 return idev;
2096}
2097
53bd6749
JP		 2098static void manage_tempaddrs(struct inet6_dev *idev,
2099 struct inet6_ifaddr *ifp,
2100 __u32 valid_lft, __u32 prefered_lft,
2101 bool create, unsigned long now)
2102{
2103 u32 flags;
2104 struct inet6_ifaddr *ift;
2105
2106 read_lock_bh(&idev->lock);
2107 /* update all temporary addresses in the list */
2108 list_for_each_entry(ift, &idev->tempaddr_list, tmp_list) {
2109 int age, max_valid, max_prefered;
2110
2111 if (ifp != ift->ifpub)
2112 continue;
2113
2114 /* RFC 4941 section 3.3:
2115 * If a received option will extend the lifetime of a public
2116 * address, the lifetimes of temporary addresses should
2117 * be extended, subject to the overall constraint that no
2118 * temporary addresses should ever remain "valid" or "preferred"
2119 * for a time longer than (TEMP_VALID_LIFETIME) or
2120 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), respectively.
2121 */
2122 age = (now - ift->cstamp) / HZ;
2123 max_valid = idev->cnf.temp_valid_lft - age;
2124 if (max_valid < 0)
2125 max_valid = 0;
2126
2127 max_prefered = idev->cnf.temp_prefered_lft -
2128 idev->cnf.max_desync_factor - age;
2129 if (max_prefered < 0)
2130 max_prefered = 0;
2131
2132 if (valid_lft > max_valid)
2133 valid_lft = max_valid;
2134
2135 if (prefered_lft > max_prefered)
2136 prefered_lft = max_prefered;
2137
2138 spin_lock(&ift->lock);
2139 flags = ift->flags;
2140 ift->valid_lft = valid_lft;
2141 ift->prefered_lft = prefered_lft;
2142 ift->tstamp = now;
2143 if (prefered_lft > 0)
2144 ift->flags &= ~IFA_F_DEPRECATED;
2145
2146 spin_unlock(&ift->lock);
2147 if (!(flags&IFA_F_TENTATIVE))
2148 ipv6_ifa_notify(0, ift);
2149 }
2150
2151 if ((create || list_empty(&idev->tempaddr_list)) &&
2152 idev->cnf.use_tempaddr > 0) {
2153 /* When a new public address is created as described
2154 * in [ADDRCONF], also create a new temporary address.
2155 * Also create a temporary address if it's enabled but
2156 * no temporary address currently exists.
2157 */
2158 read_unlock_bh(&idev->lock);
2159 ipv6_create_tempaddr(ifp, NULL);
2160 } else {
2161 read_unlock_bh(&idev->lock);
2162 }
2163}
2164
e6bff995 2165void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao)
1da177e4
LT		 2166{
2167 struct prefix_info *pinfo;
2168 __u32 valid_lft;
2169 __u32 prefered_lft;
2170 int addr_type;
1da177e4 2171 struct inet6_dev *in6_dev;
56d417b1 2172 struct net *net = dev_net(dev);
1da177e4
LT		 2173
2174 pinfo = (struct prefix_info *) opt;
1ab1457c 2175
1da177e4 2176 if (len < sizeof(struct prefix_info)) {
ba3542e1 2177 ADBG("addrconf: prefix option too short\n");
1da177e4
LT		 2178 return;
2179 }
1ab1457c 2180
1da177e4
LT		 2181 /*
2182 * Validation checks ([ADDRCONF], page 19)
2183 */
2184
2185 addr_type = ipv6_addr_type(&pinfo->prefix);
2186
2187 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
2188 return;
2189
2190 valid_lft = ntohl(pinfo->valid);
2191 prefered_lft = ntohl(pinfo->prefered);
2192
2193 if (prefered_lft > valid_lft) {
e87cc472 2194 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n");
1da177e4
LT		 2195 return;
2196 }
2197
2198 in6_dev = in6_dev_get(dev);
2199
2200 if (in6_dev == NULL) {
e87cc472
JP		 2201 net_dbg_ratelimited("addrconf: device %s not configured\n",
2202 dev->name);
1da177e4
LT		 2203 return;
2204 }
2205
2206 /*
2207 * Two things going on here:
2208 * 1) Add routes for on-link prefixes
2209 * 2) Configure prefixes with the auto flag set
2210 */
2211
4bed72e4
YH		 2212 if (pinfo->onlink) {
2213 struct rt6_info *rt;
2214 unsigned long rt_expires;
2215
6f704992
YH		 2216 /* Avoid arithmetic overflow. Really, we could
2217 * save rt_expires in seconds, likely valid_lft,
2218 * but it would require division in fib gc, that it
2219 * not good.
2220 */
4bed72e4
YH		 2221 if (HZ > USER_HZ)
2222 rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
2223 else
2224 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
3dd4bc68 2225
4bed72e4
YH		 2226 if (addrconf_finite_timeout(rt_expires))
2227 rt_expires *= HZ;
1da177e4 2228
14ef37b6
AH		 2229 rt = addrconf_get_prefix_route(&pinfo->prefix,
2230 pinfo->prefix_len,
2231 dev,
2232 RTF_ADDRCONF | RTF_PREFIX_RT,
2233 RTF_GATEWAY | RTF_DEFAULT);
1da177e4 2234
14ef37b6 2235 if (rt) {
6f704992
YH		 2236 /* Autoconf prefix route */
2237 if (valid_lft == 0) {
2238 ip6_del_rt(rt);
2239 rt = NULL;
4bed72e4 2240 } else if (addrconf_finite_timeout(rt_expires)) {
6f704992 2241 /* not infinity */
1716a961 2242 rt6_set_expires(rt, jiffies + rt_expires);
6f704992 2243 } else {
1716a961 2244 rt6_clean_expires(rt);
1da177e4
LT		 2245 }
2246 } else if (valid_lft) {
6f704992 2247 clock_t expires = 0;
4bed72e4
YH		 2248 int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
2249 if (addrconf_finite_timeout(rt_expires)) {
6f704992
YH		 2250 /* not infinity */
2251 flags |= RTF_EXPIRES;
2252 expires = jiffies_to_clock_t(rt_expires);
2253 }
1da177e4 2254 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
6f704992 2255 dev, expires, flags);
1da177e4 2256 }
94e187c0 2257 ip6_rt_put(rt);
1da177e4
LT		 2258 }
2259
2260 /* Try to figure out our local address for this prefix */
2261
2262 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
8e5e8f30 2263 struct inet6_ifaddr *ifp;
1da177e4
LT		 2264 struct in6_addr addr;
2265 int create = 0, update_lft = 0;
617fe29d 2266 bool tokenized = false;
1da177e4
LT		 2267
2268 if (pinfo->prefix_len == 64) {
2269 memcpy(&addr, &pinfo->prefix, 8);
f53adae4
DB		 2270
2271 if (!ipv6_addr_any(&in6_dev->token)) {
2272 read_lock_bh(&in6_dev->lock);
2273 memcpy(addr.s6_addr + 8,
2274 in6_dev->token.s6_addr + 8, 8);
2275 read_unlock_bh(&in6_dev->lock);
617fe29d 2276 tokenized = true;
f53adae4
DB		 2277 } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
2278 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
1da177e4
LT		 2279 in6_dev_put(in6_dev);
2280 return;
2281 }
2282 goto ok;
2283 }
e87cc472
JP		 2284 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n",
2285 pinfo->prefix_len);
1da177e4
LT		 2286 in6_dev_put(in6_dev);
2287 return;
2288
2289ok:
2290
53b7997f 2291 ifp = ipv6_get_ifaddr(net, &addr, dev, 1);
1da177e4
LT		 2292
2293 if (ifp == NULL && valid_lft) {
2294 int max_addresses = in6_dev->cnf.max_addresses;
95c385b4
NH		 2295 u32 addr_flags = 0;
2296
2297#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2298 if (in6_dev->cnf.optimistic_dad &&
e6bff995 2299 !net->ipv6.devconf_all->forwarding && sllao)
95c385b4
NH		 2300 addr_flags = IFA_F_OPTIMISTIC;
2301#endif
1da177e4
LT		 2302
2303 /* Do not allow to create too much of autoconfigured
2304 * addresses; this would be too easy way to crash kernel.
2305 */
2306 if (!max_addresses ||
2307 ipv6_count_addresses(in6_dev) < max_addresses)
3f8f5298
JP		 2308 ifp = ipv6_add_addr(in6_dev, &addr, NULL,
2309 pinfo->prefix_len,
95c385b4 2310 addr_type&IPV6_ADDR_SCOPE_MASK,
8a226b2c
JB		 2311 addr_flags, valid_lft,
2312 prefered_lft);
1da177e4 2313
3f0d2ba0 2314 if (IS_ERR_OR_NULL(ifp)) {
1da177e4
LT		 2315 in6_dev_put(in6_dev);
2316 return;
2317 }
2318
8a226b2c
JB		 2319 update_lft = 0;
2320 create = 1;
c15b1cca
HFS		 2321 spin_lock_bh(&ifp->lock);
2322 ifp->flags |= IFA_F_MANAGETEMPADDR;
1da177e4 2323 ifp->cstamp = jiffies;
617fe29d 2324 ifp->tokenized = tokenized;
c15b1cca 2325 spin_unlock_bh(&ifp->lock);
cf22f9a2 2326 addrconf_dad_start(ifp);
1da177e4
LT		 2327 }
2328
2329 if (ifp) {
479840ff 2330 u32 flags;
1da177e4 2331 unsigned long now;
1da177e4
LT		 2332 u32 stored_lft;
2333
2334 /* update lifetime (RFC2462 5.5.3 e) */
2335 spin_lock(&ifp->lock);
2336 now = jiffies;
2337 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
2338 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
2339 else
2340 stored_lft = 0;
8a226b2c 2341 if (!update_lft && !create && stored_lft) {
9451a304
FF		 2342 const u32 minimum_lft = min_t(u32,
2343 stored_lft, MIN_VALID_LIFETIME);
c9d55d5b
PM		 2344 valid_lft = max(valid_lft, minimum_lft);
2345
2346 /* RFC4862 Section 5.5.3e:
2347 * "Note that the preferred lifetime of the
2348 * corresponding address is always reset to
2349 * the Preferred Lifetime in the received
2350 * Prefix Information option, regardless of
2351 * whether the valid lifetime is also reset or
2352 * ignored."
2353 *
2354 * So we should always update prefered_lft here.
2355 */
2356 update_lft = 1;
1da177e4
LT		 2357 }
2358
2359 if (update_lft) {
2360 ifp->valid_lft = valid_lft;
2361 ifp->prefered_lft = prefered_lft;
2362 ifp->tstamp = now;
2363 flags = ifp->flags;
2364 ifp->flags &= ~IFA_F_DEPRECATED;
2365 spin_unlock(&ifp->lock);
2366
2367 if (!(flags&IFA_F_TENTATIVE))
2368 ipv6_ifa_notify(0, ifp);
2369 } else
2370 spin_unlock(&ifp->lock);
2371
53bd6749
JP		 2372 manage_tempaddrs(in6_dev, ifp, valid_lft, prefered_lft,
2373 create, now);
5d9efa7e 2374
1da177e4 2375 in6_ifa_put(ifp);
c15b1cca 2376 addrconf_verify();
1da177e4
LT		 2377 }
2378 }
2379 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
2380 in6_dev_put(in6_dev);
2381}
2382
2383/*
2384 * Set destination address.
2385 * Special case for SIT interfaces where we create a new "virtual"
2386 * device.
2387 */
af284937 2388int addrconf_set_dstaddr(struct net *net, void __user *arg)
1da177e4
LT		 2389{
2390 struct in6_ifreq ireq;
2391 struct net_device *dev;
2392 int err = -EINVAL;
2393
2394 rtnl_lock();
2395
2396 err = -EFAULT;
2397 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2398 goto err_exit;
2399
af284937 2400 dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
1da177e4
LT		 2401
2402 err = -ENODEV;
2403 if (dev == NULL)
2404 goto err_exit;
2405
07a93626 2406#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4 2407 if (dev->type == ARPHRD_SIT) {
5bc3eb7e 2408 const struct net_device_ops *ops = dev->netdev_ops;
1da177e4 2409 struct ifreq ifr;
1da177e4
LT		 2410 struct ip_tunnel_parm p;
2411
2412 err = -EADDRNOTAVAIL;
2413 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2414 goto err_exit;
2415
2416 memset(&p, 0, sizeof(p));
2417 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2418 p.iph.saddr = 0;
2419 p.iph.version = 4;
2420 p.iph.ihl = 5;
2421 p.iph.protocol = IPPROTO_IPV6;
2422 p.iph.ttl = 64;
d20b3109 2423 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
1da177e4 2424
5bc3eb7e
SH		 2425 if (ops->ndo_do_ioctl) {
2426 mm_segment_t oldfs = get_fs();
2427
2428 set_fs(KERNEL_DS);
2429 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2430 set_fs(oldfs);
2431 } else
2432 err = -EOPNOTSUPP;
1da177e4
LT		 2433
2434 if (err == 0) {
2435 err = -ENOBUFS;
af284937
DL		 2436 dev = __dev_get_by_name(net, p.name);
2437 if (!dev)
1da177e4
LT		 2438 goto err_exit;
2439 err = dev_open(dev);
2440 }
2441 }
0be669bb 2442#endif
1da177e4
LT		 2443
2444err_exit:
2445 rtnl_unlock();
2446 return err;
2447}
2448
2449/*
2450 * Manual configuration of address on an interface
2451 */
479840ff
JP		 2452static int inet6_addr_add(struct net *net, int ifindex,
2453 const struct in6_addr *pfx,
caeaba79 2454 const struct in6_addr *peer_pfx,
479840ff
JP		 2455 unsigned int plen, __u32 ifa_flags,
2456 __u32 prefered_lft, __u32 valid_lft)
1da177e4
LT		 2457{
2458 struct inet6_ifaddr *ifp;
2459 struct inet6_dev *idev;
2460 struct net_device *dev;
2461 int scope;
6f704992
YH		 2462 u32 flags;
2463 clock_t expires;
4bed72e4 2464 unsigned long timeout;
1da177e4
LT		 2465
2466 ASSERT_RTNL();
1ab1457c 2467
24ef0da7
TG		 2468 if (plen > 128)
2469 return -EINVAL;
2470
0778769d
NT		 2471 /* check the lifetime */
2472 if (!valid_lft || prefered_lft > valid_lft)
2473 return -EINVAL;
2474
53bd6749
JP		 2475 if (ifa_flags & IFA_F_MANAGETEMPADDR && plen != 64)
2476 return -EINVAL;
2477
af284937
DL		 2478 dev = __dev_get_by_index(net, ifindex);
2479 if (!dev)
1da177e4 2480 return -ENODEV;
1ab1457c 2481
64e724f6
BH		 2482 idev = addrconf_add_dev(dev);
2483 if (IS_ERR(idev))
2484 return PTR_ERR(idev);
1da177e4
LT		 2485
2486 scope = ipv6_addr_scope(pfx);
2487
4bed72e4
YH		 2488 timeout = addrconf_timeout_fixup(valid_lft, HZ);
2489 if (addrconf_finite_timeout(timeout)) {
2490 expires = jiffies_to_clock_t(timeout * HZ);
2491 valid_lft = timeout;
6f704992 2492 flags = RTF_EXPIRES;
4bed72e4
YH		 2493 } else {
2494 expires = 0;
2495 flags = 0;
2496 ifa_flags |= IFA_F_PERMANENT;
6f704992 2497 }
0778769d 2498
4bed72e4
YH		 2499 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
2500 if (addrconf_finite_timeout(timeout)) {
2501 if (timeout == 0)
2502 ifa_flags |= IFA_F_DEPRECATED;
2503 prefered_lft = timeout;
2504 }
0778769d 2505
8a226b2c
JB		 2506 ifp = ipv6_add_addr(idev, pfx, peer_pfx, plen, scope, ifa_flags,
2507 valid_lft, prefered_lft);
0778769d 2508
1da177e4 2509 if (!IS_ERR(ifp)) {
761aac73
TH		 2510 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) {
2511 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
2512 expires, flags);
2513 }
2514
95c385b4
NH		 2515 /*
2516 * Note that section 3.1 of RFC 4429 indicates
2517 * that the Optimistic flag should not be set for
2518 * manually configured addresses
2519 */
cf22f9a2 2520 addrconf_dad_start(ifp);
53bd6749
JP		 2521 if (ifa_flags & IFA_F_MANAGETEMPADDR)
2522 manage_tempaddrs(idev, ifp, valid_lft, prefered_lft,
2523 true, jiffies);
1da177e4 2524 in6_ifa_put(ifp);
c15b1cca 2525 addrconf_verify_rtnl();
1da177e4
LT		 2526 return 0;
2527 }
2528
2529 return PTR_ERR(ifp);
2530}
2531
6046d5b4
HK		 2532static int inet6_addr_del(struct net *net, int ifindex, u32 ifa_flags,
2533 const struct in6_addr *pfx, unsigned int plen)
1da177e4
LT		 2534{
2535 struct inet6_ifaddr *ifp;
2536 struct inet6_dev *idev;
2537 struct net_device *dev;
1ab1457c 2538
24ef0da7
TG		 2539 if (plen > 128)
2540 return -EINVAL;
2541
af284937
DL		 2542 dev = __dev_get_by_index(net, ifindex);
2543 if (!dev)
1da177e4
LT		 2544 return -ENODEV;
2545
e5d08d71
IM		 2546 idev = __in6_dev_get(dev);
2547 if (idev == NULL)
1da177e4
LT		 2548 return -ENXIO;
2549
2550 read_lock_bh(&idev->lock);
502a2ffd 2551 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1da177e4
LT		 2552 if (ifp->prefix_len == plen &&
2553 ipv6_addr_equal(pfx, &ifp->addr)) {
2554 in6_ifa_hold(ifp);
2555 read_unlock_bh(&idev->lock);
1ab1457c 2556
6046d5b4
HK		 2557 if (!(ifp->flags & IFA_F_TEMPORARY) &&
2558 (ifa_flags & IFA_F_MANAGETEMPADDR))
2559 manage_tempaddrs(idev, ifp, 0, 0, false,
2560 jiffies);
1da177e4 2561 ipv6_del_addr(ifp);
6046d5b4 2562 addrconf_verify_rtnl();
1da177e4
LT		 2563 return 0;
2564 }
2565 }
2566 read_unlock_bh(&idev->lock);
2567 return -EADDRNOTAVAIL;
2568}
2569
2570
af284937 2571int addrconf_add_ifaddr(struct net *net, void __user *arg)
1da177e4
LT		 2572{
2573 struct in6_ifreq ireq;
2574 int err;
1ab1457c 2575
af31f412 2576 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1da177e4 2577 return -EPERM;
1ab1457c 2578
1da177e4
LT		 2579 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2580 return -EFAULT;
2581
2582 rtnl_lock();
caeaba79 2583 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, NULL,
af284937
DL		 2584 ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2585 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
1da177e4
LT		 2586 rtnl_unlock();
2587 return err;
2588}
2589
af284937 2590int addrconf_del_ifaddr(struct net *net, void __user *arg)
1da177e4
LT		 2591{
2592 struct in6_ifreq ireq;
2593 int err;
1ab1457c 2594
af31f412 2595 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1da177e4
LT		 2596 return -EPERM;
2597
2598 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2599 return -EFAULT;
2600
2601 rtnl_lock();
6046d5b4 2602 err = inet6_addr_del(net, ireq.ifr6_ifindex, 0, &ireq.ifr6_addr,
af284937 2603 ireq.ifr6_prefixlen);
1da177e4
LT		 2604 rtnl_unlock();
2605 return err;
2606}
2607
b5f348e5
IJ		 2608static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
2609 int plen, int scope)
2610{
2611 struct inet6_ifaddr *ifp;
2612
8a226b2c 2613 ifp = ipv6_add_addr(idev, addr, NULL, plen,
07edd741
HFS		 2614 scope, IFA_F_PERMANENT,
2615 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
b5f348e5
IJ		 2616 if (!IS_ERR(ifp)) {
2617 spin_lock_bh(&ifp->lock);
2618 ifp->flags &= ~IFA_F_TENTATIVE;
2619 spin_unlock_bh(&ifp->lock);
2620 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2621 in6_ifa_put(ifp);
2622 }
2623}
2624
07a93626 2625#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4
LT		 2626static void sit_add_v4_addrs(struct inet6_dev *idev)
2627{
1da177e4
LT		 2628 struct in6_addr addr;
2629 struct net_device *dev;
c346dca1 2630 struct net *net = dev_net(idev->dev);
929c9cf3 2631 int scope, plen;
f0e2acfa 2632 u32 pflags = 0;
1da177e4
LT		 2633
2634 ASSERT_RTNL();
2635
2636 memset(&addr, 0, sizeof(struct in6_addr));
2637 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2638
2639 if (idev->dev->flags&IFF_POINTOPOINT) {
2640 addr.s6_addr32[0] = htonl(0xfe800000);
2641 scope = IFA_LINK;
929c9cf3 2642 plen = 64;
1da177e4
LT		 2643 } else {
2644 scope = IPV6_ADDR_COMPATv4;
929c9cf3 2645 plen = 96;
f0e2acfa 2646 pflags |= RTF_NONEXTHOP;
1da177e4
LT		 2647 }
2648
2649 if (addr.s6_addr32[3]) {
929c9cf3 2650 add_addr(idev, &addr, plen, scope);
f0e2acfa 2651 addrconf_prefix_route(&addr, plen, idev->dev, 0, pflags);
1da177e4
LT		 2652 return;
2653 }
2654
6fda7350 2655 for_each_netdev(net, dev) {
8e5e8f30 2656 struct in_device *in_dev = __in_dev_get_rtnl(dev);
1da177e4 2657 if (in_dev && (dev->flags & IFF_UP)) {
8e5e8f30 2658 struct in_ifaddr *ifa;
1da177e4
LT		 2659
2660 int flag = scope;
2661
2662 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
1da177e4
LT		 2663
2664 addr.s6_addr32[3] = ifa->ifa_local;
2665
2666 if (ifa->ifa_scope == RT_SCOPE_LINK)
2667 continue;
2668 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2669 if (idev->dev->flags&IFF_POINTOPOINT)
2670 continue;
2671 flag |= IFA_HOST;
2672 }
1da177e4 2673
b5f348e5 2674 add_addr(idev, &addr, plen, flag);
f0e2acfa
ND		 2675 addrconf_prefix_route(&addr, plen, idev->dev, 0,
2676 pflags);
1da177e4
LT		 2677 }
2678 }
1ab1457c 2679 }
1da177e4 2680}
0be669bb 2681#endif
1da177e4
LT		 2682
2683static void init_loopback(struct net_device *dev)
2684{
2685 struct inet6_dev *idev;
25fb6ca4
BK		 2686 struct net_device *sp_dev;
2687 struct inet6_ifaddr *sp_ifa;
2688 struct rt6_info *sp_rt;
1da177e4
LT		 2689
2690 /* ::1 */
2691
2692 ASSERT_RTNL();
2693
e5d08d71
IM		 2694 idev = ipv6_find_idev(dev);
2695 if (idev == NULL) {
91df42be 2696 pr_debug("%s: add_dev failed\n", __func__);
1da177e4
LT		 2697 return;
2698 }
2699
b5f348e5 2700 add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
25fb6ca4
BK		 2701
2702 /* Add routes to other interface's IPv6 addresses */
2703 for_each_netdev(dev_net(dev), sp_dev) {
2704 if (!strcmp(sp_dev->name, dev->name))
2705 continue;
2706
2707 idev = __in6_dev_get(sp_dev);
2708 if (!idev)
2709 continue;
2710
2711 read_lock_bh(&idev->lock);
2712 list_for_each_entry(sp_ifa, &idev->addr_list, if_list) {
2713
2714 if (sp_ifa->flags & (IFA_F_DADFAILED | IFA_F_TENTATIVE))
2715 continue;
2716
33d99113
G		 2717 if (sp_ifa->rt) {
2718 /* This dst has been added to garbage list when
2719 * lo device down, release this obsolete dst and
2720 * reallocate a new router for ifa.
2721 */
2722 if (sp_ifa->rt->dst.obsolete > 0) {
2723 ip6_rt_put(sp_ifa->rt);
2724 sp_ifa->rt = NULL;
2725 } else {
2726 continue;
2727 }
2728 }
a881ae1f 2729
57ec0afe 2730 sp_rt = addrconf_dst_alloc(idev, &sp_ifa->addr, false);
25fb6ca4
BK		 2731
2732 /* Failure cases are ignored */
534c8779
G		 2733 if (!IS_ERR(sp_rt)) {
2734 sp_ifa->rt = sp_rt;
25fb6ca4 2735 ip6_ins_rt(sp_rt);
534c8779 2736 }
25fb6ca4
BK		 2737 }
2738 read_unlock_bh(&idev->lock);
2739 }
1da177e4
LT		 2740}
2741
b71d1d42 2742static void addrconf_add_linklocal(struct inet6_dev *idev, const struct in6_addr *addr)
1da177e4 2743{
8e5e8f30 2744 struct inet6_ifaddr *ifp;
95c385b4
NH		 2745 u32 addr_flags = IFA_F_PERMANENT;
2746
2747#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2748 if (idev->cnf.optimistic_dad &&
702beb87 2749 !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
95c385b4
NH		 2750 addr_flags |= IFA_F_OPTIMISTIC;
2751#endif
1da177e4 2752
95c385b4 2753
07edd741
HFS		 2754 ifp = ipv6_add_addr(idev, addr, NULL, 64, IFA_LINK, addr_flags,
2755 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
1da177e4 2756 if (!IS_ERR(ifp)) {
46d48046 2757 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
cf22f9a2 2758 addrconf_dad_start(ifp);
1da177e4
LT		 2759 in6_ifa_put(ifp);
2760 }
2761}
2762
bc91b0f0
JP		 2763static void addrconf_addr_gen(struct inet6_dev *idev, bool prefix_route)
2764{
2765 if (idev->addr_gen_mode == IN6_ADDR_GEN_MODE_EUI64) {
2766 struct in6_addr addr;
2767
2768 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
2769 /* addrconf_add_linklocal also adds a prefix_route and we
2770 * only need to care about prefix routes if ipv6_generate_eui64
2771 * couldn't generate one.
2772 */
2773 if (ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) == 0)
2774 addrconf_add_linklocal(idev, &addr);
2775 else if (prefix_route)
2776 addrconf_prefix_route(&addr, 64, idev->dev, 0, 0);
2777 }
2778}
2779
1da177e4
LT		 2780static void addrconf_dev_config(struct net_device *dev)
2781{
8e5e8f30 2782 struct inet6_dev *idev;
1da177e4
LT		 2783
2784 ASSERT_RTNL();
2785
74235a25
HX		 2786 if ((dev->type != ARPHRD_ETHER) &&
2787 (dev->type != ARPHRD_FDDI) &&
74235a25 2788 (dev->type != ARPHRD_ARCNET) &&
06a4c1c5 2789 (dev->type != ARPHRD_INFINIBAND) &&
cb6bf355 2790 (dev->type != ARPHRD_IEEE802154) &&
e837735e 2791 (dev->type != ARPHRD_IEEE1394) &&
e74bccb8
JR		 2792 (dev->type != ARPHRD_TUNNEL6) &&
2793 (dev->type != ARPHRD_6LOWPAN)) {
74235a25
HX		 2794 /* Alas, we support only Ethernet autoconfiguration. */
2795 return;
2796 }
2797
1da177e4 2798 idev = addrconf_add_dev(dev);
64e724f6 2799 if (IS_ERR(idev))
1da177e4
LT		 2800 return;
2801
bc91b0f0 2802 addrconf_addr_gen(idev, false);
1da177e4
LT		 2803}
2804
07a93626 2805#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4
LT		 2806static void addrconf_sit_config(struct net_device *dev)
2807{
2808 struct inet6_dev *idev;
2809
2810 ASSERT_RTNL();
2811
1ab1457c
YH		 2812 /*
2813 * Configure the tunnel with one of our IPv4
2814 * addresses... we should configure all of
1da177e4
LT		 2815 * our v4 addrs in the tunnel
2816 */
2817
e5d08d71
IM		 2818 idev = ipv6_find_idev(dev);
2819 if (idev == NULL) {
91df42be 2820 pr_debug("%s: add_dev failed\n", __func__);
1da177e4
LT		 2821 return;
2822 }
2823
c7dc89c0 2824 if (dev->priv_flags & IFF_ISATAP) {
bc91b0f0 2825 addrconf_addr_gen(idev, false);
c7dc89c0
FT		 2826 return;
2827 }
2828
1da177e4
LT		 2829 sit_add_v4_addrs(idev);
2830
62b54dd9 2831 if (dev->flags&IFF_POINTOPOINT)
1da177e4 2832 addrconf_add_mroute(dev);
1da177e4 2833}
0be669bb 2834#endif
1da177e4 2835
07a93626 2836#if IS_ENABLED(CONFIG_NET_IPGRE)
aee80b54 2837static void addrconf_gre_config(struct net_device *dev)
2838{
2839 struct inet6_dev *idev;
aee80b54 2840
aee80b54 2841 ASSERT_RTNL();
2842
e5d08d71
IM		 2843 idev = ipv6_find_idev(dev);
2844 if (idev == NULL) {
91df42be 2845 pr_debug("%s: add_dev failed\n", __func__);
aee80b54 2846 return;
2847 }
2848
bc91b0f0 2849 addrconf_addr_gen(idev, true);
aee80b54 2850}
2851#endif
2852
1ab1457c 2853static int addrconf_notify(struct notifier_block *this, unsigned long event,
351638e7 2854 void *ptr)
1da177e4 2855{
351638e7 2856 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
748e2d93 2857 struct inet6_dev *idev = __in6_dev_get(dev);
c5e33bdd 2858 int run_pending = 0;
b217d616 2859 int err;
1da177e4 2860
e21e8467 2861 switch (event) {
45ba9dd2 2862 case NETDEV_REGISTER:
74235a25 2863 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
45ba9dd2 2864 idev = ipv6_add_dev(dev);
a317a2f1
WC		 2865 if (IS_ERR(idev))
2866 return notifier_from_errno(PTR_ERR(idev));
45ba9dd2
YH		 2867 }
2868 break;
bcdd553f 2869
1da177e4 2870 case NETDEV_UP:
3c21edbd 2871 case NETDEV_CHANGE:
c2edacf8
JV		 2872 if (dev->flags & IFF_SLAVE)
2873 break;
2874
3ce62a84
WC		 2875 if (idev && idev->cnf.disable_ipv6)
2876 break;
2877
3c21edbd 2878 if (event == NETDEV_UP) {
f24e3d65 2879 if (!addrconf_qdisc_ok(dev)) {
3c21edbd 2880 /* device is not ready yet. */
f3213831 2881 pr_info("ADDRCONF(NETDEV_UP): %s: link is not ready\n",
3c21edbd
YH		 2882 dev->name);
2883 break;
2884 }
99081049 2885
d31c7b8f
EP		 2886 if (!idev && dev->mtu >= IPV6_MIN_MTU)
2887 idev = ipv6_add_dev(dev);
2888
a317a2f1 2889 if (!IS_ERR_OR_NULL(idev)) {
99081049 2890 idev->if_flags |= IF_READY;
e3ec6cfc
BT		 2891 run_pending = 1;
2892 }
3c21edbd 2893 } else {
f24e3d65 2894 if (!addrconf_qdisc_ok(dev)) {
3c21edbd
YH		 2895 /* device is still not ready. */
2896 break;
2897 }
2898
2899 if (idev) {
bcdd553f 2900 if (idev->if_flags & IF_READY)
3c21edbd
YH		 2901 /* device is already configured. */
2902 break;
3c21edbd
YH		 2903 idev->if_flags |= IF_READY;
2904 }
2905
f3213831
JP		 2906 pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n",
2907 dev->name);
3c21edbd 2908
c5e33bdd 2909 run_pending = 1;
3c21edbd
YH		 2910 }
2911
e21e8467 2912 switch (dev->type) {
07a93626 2913#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4
LT		 2914 case ARPHRD_SIT:
2915 addrconf_sit_config(dev);
2916 break;
aee80b54 2917#endif
07a93626 2918#if IS_ENABLED(CONFIG_NET_IPGRE)
aee80b54 2919 case ARPHRD_IPGRE:
2920 addrconf_gre_config(dev);
2921 break;
0be669bb 2922#endif
1da177e4
LT		 2923 case ARPHRD_LOOPBACK:
2924 init_loopback(dev);
2925 break;
2926
2927 default:
2928 addrconf_dev_config(dev);
2929 break;
3ff50b79 2930 }
bcdd553f 2931
a317a2f1 2932 if (!IS_ERR_OR_NULL(idev)) {
c5e33bdd
YH		 2933 if (run_pending)
2934 addrconf_dad_run(idev);
2935
bcdd553f
SH		 2936 /*
2937 * If the MTU changed during the interface down,
2938 * when the interface up, the changed MTU must be
2939 * reflected in the idev as well as routers.
1da177e4 2940 */
bcdd553f
SH		 2941 if (idev->cnf.mtu6 != dev->mtu &&
2942 dev->mtu >= IPV6_MIN_MTU) {
1da177e4
LT		 2943 rt6_mtu_change(dev, dev->mtu);
2944 idev->cnf.mtu6 = dev->mtu;
2945 }
2946 idev->tstamp = jiffies;
2947 inet6_ifinfo_notify(RTM_NEWLINK, idev);
bcdd553f
SH		 2948
2949 /*
2950 * If the changed mtu during down is lower than
2951 * IPV6_MIN_MTU stop IPv6 on this interface.
1da177e4
LT		 2952 */
2953 if (dev->mtu < IPV6_MIN_MTU)
bcdd553f 2954 addrconf_ifdown(dev, 1);
1da177e4
LT		 2955 }
2956 break;
2957
2958 case NETDEV_CHANGEMTU:
d31c7b8f 2959 if (idev && dev->mtu >= IPV6_MIN_MTU) {
1da177e4
LT		 2960 rt6_mtu_change(dev, dev->mtu);
2961 idev->cnf.mtu6 = dev->mtu;
2962 break;
2963 }
2964
d31c7b8f
EP		 2965 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2966 idev = ipv6_add_dev(dev);
a317a2f1 2967 if (!IS_ERR(idev))
d31c7b8f
EP		 2968 break;
2969 }
2970
bcdd553f 2971 /*
db9c7c39 2972 * if MTU under IPV6_MIN_MTU.
bcdd553f
SH		 2973 * Stop IPv6 on this interface.
2974 */
1da177e4
LT		 2975
2976 case NETDEV_DOWN:
2977 case NETDEV_UNREGISTER:
2978 /*
2979 * Remove all addresses from this interface.
2980 */
2981 addrconf_ifdown(dev, event != NETDEV_DOWN);
2982 break;
3c21edbd 2983
1da177e4 2984 case NETDEV_CHANGENAME:
1da177e4 2985 if (idev) {
5632c515 2986 snmp6_unregister_dev(idev);
408c4768 2987 addrconf_sysctl_unregister(idev);
a317a2f1 2988 err = addrconf_sysctl_register(idev);
b217d616
HX		 2989 if (err)
2990 return notifier_from_errno(err);
a317a2f1
WC		 2991 err = snmp6_register_dev(idev);
2992 if (err) {
2993 addrconf_sysctl_unregister(idev);
2994 return notifier_from_errno(err);
2995 }
5632c515 2996 }
1da177e4 2997 break;
bcdd553f 2998
93d9b7d7
JP		 2999 case NETDEV_PRE_TYPE_CHANGE:
3000 case NETDEV_POST_TYPE_CHANGE:
3001 addrconf_type_change(dev, event);
75c78500 3002 break;
3ff50b79 3003 }
1da177e4
LT		 3004
3005 return NOTIFY_OK;
3006}
3007
3008/*
3009 * addrconf module should be notified of a device going up
3010 */
3011static struct notifier_block ipv6_dev_notf = {
3012 .notifier_call = addrconf_notify,
1da177e4
LT		 3013};
3014
93d9b7d7 3015static void addrconf_type_change(struct net_device *dev, unsigned long event)
75c78500
MS		 3016{
3017 struct inet6_dev *idev;
3018 ASSERT_RTNL();
3019
3020 idev = __in6_dev_get(dev);
3021
93d9b7d7 3022 if (event == NETDEV_POST_TYPE_CHANGE)
75c78500 3023 ipv6_mc_remap(idev);
93d9b7d7 3024 else if (event == NETDEV_PRE_TYPE_CHANGE)
75c78500
MS		 3025 ipv6_mc_unmap(idev);
3026}
3027
1da177e4
LT		 3028static int addrconf_ifdown(struct net_device *dev, int how)
3029{
c346dca1 3030 struct net *net = dev_net(dev);
502a2ffd 3031 struct inet6_dev *idev;
3032 struct inet6_ifaddr *ifa;
73a8bd74 3033 int state, i;
1da177e4
LT		 3034
3035 ASSERT_RTNL();
3036
73a8bd74
DM		 3037 rt6_ifdown(net, dev);
3038 neigh_ifdown(&nd_tbl, dev);
1da177e4
LT		 3039
3040 idev = __in6_dev_get(dev);
3041 if (idev == NULL)
3042 return -ENODEV;
3043
bcdd553f
SH		 3044 /*
3045 * Step 1: remove reference to ipv6 device from parent device.
3046 * Do not dev_put!
1da177e4 3047 */
439e2385 3048 if (how) {
1da177e4 3049 idev->dead = 1;
8814c4b5
YH		 3050
3051 /* protected by rtnl_lock */
a9b3cd7f 3052 RCU_INIT_POINTER(dev->ip6_ptr, NULL);
1da177e4
LT		 3053
3054 /* Step 1.5: remove snmp6 entry */
3055 snmp6_unregister_dev(idev);
3056
3057 }
3058
73a8bd74
DM		 3059 /* Step 2: clear hash table */
3060 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3061 struct hlist_head *h = &inet6_addr_lst[i];
73a8bd74
DM		 3062
3063 spin_lock_bh(&addrconf_hash_lock);
67ba4152 3064restart:
b67bfe0d 3065 hlist_for_each_entry_rcu(ifa, h, addr_lst) {
73a8bd74
DM		 3066 if (ifa->idev == idev) {
3067 hlist_del_init_rcu(&ifa->addr_lst);
c15b1cca 3068 addrconf_del_dad_work(ifa);
73a8bd74
DM		 3069 goto restart;
3070 }
3071 }
3072 spin_unlock_bh(&addrconf_hash_lock);
3073 }
3074
1da177e4
LT		 3075 write_lock_bh(&idev->lock);
3076
b7b1bfce
HFS		 3077 addrconf_del_rs_timer(idev);
3078
bcdd553f 3079 /* Step 2: clear flags for stateless addrconf */
439e2385 3080 if (!how)
3c21edbd 3081 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
1da177e4 3082
439e2385 3083 if (how && del_timer(&idev->regen_timer))
1da177e4
LT		 3084 in6_dev_put(idev);
3085
bcdd553f 3086 /* Step 3: clear tempaddr list */
372e6c8f 3087 while (!list_empty(&idev->tempaddr_list)) {
3088 ifa = list_first_entry(&idev->tempaddr_list,
3089 struct inet6_ifaddr, tmp_list);
3090 list_del(&ifa->tmp_list);
1da177e4
LT		 3091 write_unlock_bh(&idev->lock);
3092 spin_lock_bh(&ifa->lock);
3093
3094 if (ifa->ifpub) {
3095 in6_ifa_put(ifa->ifpub);
3096 ifa->ifpub = NULL;
3097 }
3098 spin_unlock_bh(&ifa->lock);
3099 in6_ifa_put(ifa);
3100 write_lock_bh(&idev->lock);
3101 }
8f37ada5 3102
502a2ffd 3103 while (!list_empty(&idev->addr_list)) {
3104 ifa = list_first_entry(&idev->addr_list,
3105 struct inet6_ifaddr, if_list);
c15b1cca 3106 addrconf_del_dad_work(ifa);
84e8b803 3107
73a8bd74 3108 list_del(&ifa->if_list);
84e8b803 3109
73a8bd74 3110 write_unlock_bh(&idev->lock);
84e8b803 3111
73a8bd74
DM		 3112 spin_lock_bh(&ifa->state_lock);
3113 state = ifa->state;
3114 ifa->state = INET6_IFADDR_STATE_DEAD;
3115 spin_unlock_bh(&ifa->state_lock);
9d82ca98 3116
73a8bd74
DM		 3117 if (state != INET6_IFADDR_STATE_DEAD) {
3118 __ipv6_ifa_notify(RTM_DELADDR, ifa);
f88c91dd 3119 inet6addr_notifier_call_chain(NETDEV_DOWN, ifa);
27bdb2ab 3120 }
73a8bd74 3121 in6_ifa_put(ifa);
8f37ada5 3122
73a8bd74
DM		 3123 write_lock_bh(&idev->lock);
3124 }
8f37ada5 3125
1da177e4
LT		 3126 write_unlock_bh(&idev->lock);
3127
381f4dca
SD		 3128 /* Step 5: Discard anycast and multicast list */
3129 if (how) {
3130 ipv6_ac_destroy_dev(idev);
1da177e4 3131 ipv6_mc_destroy_dev(idev);
381f4dca 3132 } else {
1da177e4 3133 ipv6_mc_down(idev);
381f4dca 3134 }
1da177e4 3135
1da177e4 3136 idev->tstamp = jiffies;
1ab1457c 3137
bcdd553f 3138 /* Last: Shot the device (if unregistered) */
439e2385 3139 if (how) {
408c4768 3140 addrconf_sysctl_unregister(idev);
1da177e4
LT		 3141 neigh_parms_release(&nd_tbl, idev->nd_parms);
3142 neigh_ifdown(&nd_tbl, dev);
3143 in6_dev_put(idev);
3144 }
3145 return 0;
3146}
3147
3148static void addrconf_rs_timer(unsigned long data)
3149{
b7b1bfce 3150 struct inet6_dev *idev = (struct inet6_dev *)data;
caf92bc4 3151 struct net_device *dev = idev->dev;
b7b1bfce 3152 struct in6_addr lladdr;
1da177e4 3153
b7b1bfce 3154 write_lock(&idev->lock);
5b2a1953 3155 if (idev->dead || !(idev->if_flags & IF_READY))
1da177e4
LT		 3156 goto out;
3157
9ba2add3 3158 if (!ipv6_accept_ra(idev))
5b2a1953 3159 goto out;
3160
3161 /* Announcement received after solicitation was sent */
3162 if (idev->if_flags & IF_RA_RCVD)
1da177e4 3163 goto out;
1da177e4 3164
b7b1bfce 3165 if (idev->rs_probes++ < idev->cnf.rtr_solicits) {
caf92bc4
CW		 3166 write_unlock(&idev->lock);
3167 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
3168 ndisc_send_rs(dev, &lladdr,
b7b1bfce
HFS		 3169 &in6addr_linklocal_allrouters);
3170 else
caf92bc4 3171 goto put;
1da177e4 3172
caf92bc4 3173 write_lock(&idev->lock);
b7b1bfce
HFS		 3174 /* The wait after the last probe can be shorter */
3175 addrconf_mod_rs_timer(idev, (idev->rs_probes ==
3176 idev->cnf.rtr_solicits) ?
3177 idev->cnf.rtr_solicit_delay :
3178 idev->cnf.rtr_solicit_interval);
1da177e4 3179 } else {
1da177e4
LT		 3180 /*
3181 * Note: we do not support deprecated "all on-link"
3182 * assumption any longer.
3183 */
91df42be 3184 pr_debug("%s: no IPv6 routers present\n", idev->dev->name);
1da177e4
LT		 3185 }
3186
3187out:
b7b1bfce 3188 write_unlock(&idev->lock);
caf92bc4 3189put:
b7b1bfce 3190 in6_dev_put(idev);
1da177e4
LT		 3191}
3192
3193/*
3194 * Duplicate Address Detection
3195 */
3c21edbd
YH		 3196static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
3197{
3198 unsigned long rand_num;
3199 struct inet6_dev *idev = ifp->idev;
3200
95c385b4
NH		 3201 if (ifp->flags & IFA_F_OPTIMISTIC)
3202 rand_num = 0;
3203 else
63862b5b 3204 rand_num = prandom_u32() % (idev->cnf.rtr_solicit_delay ? : 1);
95c385b4 3205
b7b1bfce 3206 ifp->dad_probes = idev->cnf.dad_transmits;
c15b1cca 3207 addrconf_mod_dad_work(ifp, rand_num);
3c21edbd
YH		 3208}
3209
c15b1cca 3210static void addrconf_dad_begin(struct inet6_ifaddr *ifp)
1da177e4
LT		 3211{
3212 struct inet6_dev *idev = ifp->idev;
3213 struct net_device *dev = idev->dev;
1da177e4
LT		 3214
3215 addrconf_join_solict(dev, &ifp->addr);
3216
63862b5b 3217 prandom_seed((__force u32) ifp->addr.s6_addr32[3]);
1da177e4
LT		 3218
3219 read_lock_bh(&idev->lock);
622ccdf1 3220 spin_lock(&ifp->lock);
e9d3e084 3221 if (ifp->state == INET6_IFADDR_STATE_DEAD)
1da177e4 3222 goto out;
1da177e4
LT		 3223
3224 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
1b34be74 3225 idev->cnf.accept_dad < 1 ||
55ebaef1
NT		 3226 !(ifp->flags&IFA_F_TENTATIVE) ||
3227 ifp->flags & IFA_F_NODAD) {
cc411d0b 3228 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
21809faf 3229 spin_unlock(&ifp->lock);
1da177e4
LT		 3230 read_unlock_bh(&idev->lock);
3231
3232 addrconf_dad_completed(ifp);
3233 return;
3234 }
3235
6732bade 3236 if (!(idev->if_flags & IF_READY)) {
21809faf 3237 spin_unlock(&ifp->lock);
6732bade 3238 read_unlock_bh(&idev->lock);
3c21edbd 3239 /*
590a9887 3240 * If the device is not ready:
3c21edbd
YH		 3241 * - keep it tentative if it is a permanent address.
3242 * - otherwise, kill it.
3243 */
3244 in6_ifa_hold(ifp);
cc411d0b 3245 addrconf_dad_stop(ifp, 0);
6732bade 3246 return;
3c21edbd 3247 }
95c385b4
NH		 3248
3249 /*
3250 * Optimistic nodes can start receiving
3251 * Frames right away
3252 */
7fd2561e 3253 if (ifp->flags & IFA_F_OPTIMISTIC) {
95c385b4 3254 ip6_ins_rt(ifp->rt);
7fd2561e
EK		 3255 if (ipv6_use_optimistic_addr(idev)) {
3256 /* Because optimistic nodes can use this address,
3257 * notify listeners. If DAD fails, RTM_DELADDR is sent.
3258 */
3259 ipv6_ifa_notify(RTM_NEWADDR, ifp);
3260 }
3261 }
95c385b4 3262
6732bade 3263 addrconf_dad_kick(ifp);
1da177e4 3264out:
622ccdf1 3265 spin_unlock(&ifp->lock);
1da177e4
LT		 3266 read_unlock_bh(&idev->lock);
3267}
3268
c15b1cca 3269static void addrconf_dad_start(struct inet6_ifaddr *ifp)
1da177e4 3270{
c15b1cca
HFS		 3271 bool begin_dad = false;
3272
3273 spin_lock_bh(&ifp->state_lock);
3274 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
3275 ifp->state = INET6_IFADDR_STATE_PREDAD;
3276 begin_dad = true;
3277 }
3278 spin_unlock_bh(&ifp->state_lock);
3279
3280 if (begin_dad)
3281 addrconf_mod_dad_work(ifp, 0);
3282}
3283
3284static void addrconf_dad_work(struct work_struct *w)
3285{
3286 struct inet6_ifaddr *ifp = container_of(to_delayed_work(w),
3287 struct inet6_ifaddr,
3288 dad_work);
1da177e4 3289 struct inet6_dev *idev = ifp->idev;
1da177e4
LT		 3290 struct in6_addr mcaddr;
3291
c15b1cca
HFS		 3292 enum {
3293 DAD_PROCESS,
3294 DAD_BEGIN,
3295 DAD_ABORT,
3296 } action = DAD_PROCESS;
3297
3298 rtnl_lock();
3299
3300 spin_lock_bh(&ifp->state_lock);
3301 if (ifp->state == INET6_IFADDR_STATE_PREDAD) {
3302 action = DAD_BEGIN;
3303 ifp->state = INET6_IFADDR_STATE_DAD;
3304 } else if (ifp->state == INET6_IFADDR_STATE_ERRDAD) {
3305 action = DAD_ABORT;
3306 ifp->state = INET6_IFADDR_STATE_POSTDAD;
3307 }
3308 spin_unlock_bh(&ifp->state_lock);
3309
3310 if (action == DAD_BEGIN) {
3311 addrconf_dad_begin(ifp);
3312 goto out;
3313 } else if (action == DAD_ABORT) {
3314 addrconf_dad_stop(ifp, 1);
3315 goto out;
3316 }
3317
b7b1bfce 3318 if (!ifp->dad_probes && addrconf_dad_end(ifp))
f2344a13
HX		 3319 goto out;
3320
c15b1cca 3321 write_lock_bh(&idev->lock);
122e4519 3322 if (idev->dead || !(idev->if_flags & IF_READY)) {
c15b1cca 3323 write_unlock_bh(&idev->lock);
1da177e4
LT		 3324 goto out;
3325 }
21809faf 3326
3327 spin_lock(&ifp->lock);
622ccdf1
HX		 3328 if (ifp->state == INET6_IFADDR_STATE_DEAD) {
3329 spin_unlock(&ifp->lock);
c15b1cca 3330 write_unlock_bh(&idev->lock);
622ccdf1
HX		 3331 goto out;
3332 }
3333
b7b1bfce 3334 if (ifp->dad_probes == 0) {
1da177e4
LT		 3335 /*
3336 * DAD was successful
3337 */
3338
cc411d0b 3339 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
21809faf 3340 spin_unlock(&ifp->lock);
c15b1cca 3341 write_unlock_bh(&idev->lock);
1da177e4
LT		 3342
3343 addrconf_dad_completed(ifp);
3344
3345 goto out;
3346 }
3347
b7b1bfce 3348 ifp->dad_probes--;
c15b1cca
HFS		 3349 addrconf_mod_dad_work(ifp,
3350 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME));
21809faf 3351 spin_unlock(&ifp->lock);
c15b1cca 3352 write_unlock_bh(&idev->lock);
1da177e4
LT		 3353
3354 /* send a neighbour solicitation for our addr */
1da177e4 3355 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
d7aabf22 3356 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &in6addr_any);
1da177e4
LT		 3357out:
3358 in6_ifa_put(ifp);
c15b1cca 3359 rtnl_unlock();
1da177e4
LT		 3360}
3361
11ffff75
HFS		 3362/* ifp->idev must be at least read locked */
3363static bool ipv6_lonely_lladdr(struct inet6_ifaddr *ifp)
3364{
3365 struct inet6_ifaddr *ifpiter;
3366 struct inet6_dev *idev = ifp->idev;
3367
602582ca
HFS		 3368 list_for_each_entry_reverse(ifpiter, &idev->addr_list, if_list) {
3369 if (ifpiter->scope > IFA_LINK)
3370 break;
11ffff75
HFS		 3371 if (ifp != ifpiter && ifpiter->scope == IFA_LINK &&
3372 (ifpiter->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE|
3373 IFA_F_OPTIMISTIC|IFA_F_DADFAILED)) ==
3374 IFA_F_PERMANENT)
3375 return false;
3376 }
3377 return true;
3378}
3379
1da177e4
LT		 3380static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
3381{
e21e8467 3382 struct net_device *dev = ifp->idev->dev;
b7b1bfce 3383 struct in6_addr lladdr;
b173ee48 3384 bool send_rs, send_mld;
b7b1bfce 3385
c15b1cca 3386 addrconf_del_dad_work(ifp);
1da177e4
LT		 3387
3388 /*
3389 * Configure the address for reception. Now it is valid.
3390 */
3391
3392 ipv6_ifa_notify(RTM_NEWADDR, ifp);
3393
026359bc
TA		 3394 /* If added prefix is link local and we are prepared to process
3395 router advertisements, start sending router solicitations.
1da177e4
LT		 3396 */
3397
1ec047eb 3398 read_lock_bh(&ifp->idev->lock);
11ffff75 3399 send_mld = ifp->scope == IFA_LINK && ipv6_lonely_lladdr(ifp);
b173ee48
HFS		 3400 send_rs = send_mld &&
3401 ipv6_accept_ra(ifp->idev) &&
1ec047eb 3402 ifp->idev->cnf.rtr_solicits > 0 &&
b173ee48 3403 (dev->flags&IFF_LOOPBACK) == 0;
1ec047eb
HFS		 3404 read_unlock_bh(&ifp->idev->lock);
3405
b173ee48
HFS		 3406 /* While dad is in progress mld report's source address is in6_addrany.
3407 * Resend with proper ll now.
3408 */
3409 if (send_mld)
3410 ipv6_mc_dad_complete(ifp->idev);
3411
1ec047eb 3412 if (send_rs) {
1da177e4
LT		 3413 /*
3414 * If a host as already performed a random delay
3415 * [...] as part of DAD [...] there is no need
3416 * to delay again before sending the first RS
3417 */
1ec047eb 3418 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
b7b1bfce 3419 return;
1ec047eb 3420 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters);
1da177e4 3421
b7b1bfce
HFS		 3422 write_lock_bh(&ifp->idev->lock);
3423 spin_lock(&ifp->lock);
3424 ifp->idev->rs_probes = 1;
1da177e4 3425 ifp->idev->if_flags |= IF_RS_SENT;
b7b1bfce
HFS		 3426 addrconf_mod_rs_timer(ifp->idev,
3427 ifp->idev->cnf.rtr_solicit_interval);
3428 spin_unlock(&ifp->lock);
3429 write_unlock_bh(&ifp->idev->lock);
1da177e4
LT		 3430 }
3431}
3432
e21e8467
SH		 3433static void addrconf_dad_run(struct inet6_dev *idev)
3434{
c5e33bdd
YH		 3435 struct inet6_ifaddr *ifp;
3436
3437 read_lock_bh(&idev->lock);
502a2ffd 3438 list_for_each_entry(ifp, &idev->addr_list, if_list) {
21809faf 3439 spin_lock(&ifp->lock);
f2344a13
HX		 3440 if (ifp->flags & IFA_F_TENTATIVE &&
3441 ifp->state == INET6_IFADDR_STATE_DAD)
3442 addrconf_dad_kick(ifp);
21809faf 3443 spin_unlock(&ifp->lock);
c5e33bdd
YH		 3444 }
3445 read_unlock_bh(&idev->lock);
3446}
3447
1da177e4
LT		 3448#ifdef CONFIG_PROC_FS
3449struct if6_iter_state {
3c40090a 3450 struct seq_net_private p;
1da177e4 3451 int bucket;
1d578303 3452 int offset;
1da177e4
LT		 3453};
3454
1d578303 3455static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos)
1da177e4
LT		 3456{
3457 struct inet6_ifaddr *ifa = NULL;
3458 struct if6_iter_state *state = seq->private;
1218854a 3459 struct net *net = seq_file_net(seq);
1d578303 3460 int p = 0;
1da177e4 3461
1d578303
MM		 3462 /* initial bucket if pos is 0 */
3463 if (pos == 0) {
3464 state->bucket = 0;
3465 state->offset = 0;
3466 }
3467
3468 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
b67bfe0d 3469 hlist_for_each_entry_rcu_bh(ifa, &inet6_addr_lst[state->bucket],
1d578303 3470 addr_lst) {
9f0d3c27
ED		 3471 if (!net_eq(dev_net(ifa->idev->dev), net))
3472 continue;
1d578303
MM		 3473 /* sync with offset */
3474 if (p < state->offset) {
3475 p++;
3476 continue;
3477 }
3478 state->offset++;
9f0d3c27 3479 return ifa;
1d578303
MM		 3480 }
3481
3482 /* prepare for next bucket */
3483 state->offset = 0;
3484 p = 0;
1da177e4 3485 }
c2e21293 3486 return NULL;
1da177e4
LT		 3487}
3488
c2e21293 3489static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
3490 struct inet6_ifaddr *ifa)
1da177e4
LT		 3491{
3492 struct if6_iter_state *state = seq->private;
1218854a 3493 struct net *net = seq_file_net(seq);
1da177e4 3494
b67bfe0d 3495 hlist_for_each_entry_continue_rcu_bh(ifa, addr_lst) {
9f0d3c27
ED		 3496 if (!net_eq(dev_net(ifa->idev->dev), net))
3497 continue;
1d578303 3498 state->offset++;
9f0d3c27 3499 return ifa;
1d578303 3500 }
3c40090a 3501
c2e21293 3502 while (++state->bucket < IN6_ADDR_HSIZE) {
1d578303 3503 state->offset = 0;
b67bfe0d 3504 hlist_for_each_entry_rcu_bh(ifa,
c2e21293 3505 &inet6_addr_lst[state->bucket], addr_lst) {
9f0d3c27
ED		 3506 if (!net_eq(dev_net(ifa->idev->dev), net))
3507 continue;
1d578303 3508 state->offset++;
9f0d3c27 3509 return ifa;
c2e21293 3510 }
1da177e4 3511 }
3c40090a 3512
c2e21293 3513 return NULL;
1da177e4
LT		 3514}
3515
1da177e4 3516static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
4f70ecca 3517 __acquires(rcu_bh)
1da177e4 3518{
5c578aed 3519 rcu_read_lock_bh();
1d578303 3520 return if6_get_first(seq, *pos);
1da177e4
LT		 3521}
3522
3523static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3524{
3525 struct inet6_ifaddr *ifa;
3526
3527 ifa = if6_get_next(seq, v);
3528 ++*pos;
3529 return ifa;
3530}
3531
3532static void if6_seq_stop(struct seq_file *seq, void *v)
4f70ecca 3533 __releases(rcu_bh)
1da177e4 3534{
5c578aed 3535 rcu_read_unlock_bh();
1da177e4
LT		 3536}
3537
3538static int if6_seq_show(struct seq_file *seq, void *v)
3539{
3540 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
971a351c 3541 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
b071195d 3542 &ifp->addr,
1da177e4
LT		 3543 ifp->idev->dev->ifindex,
3544 ifp->prefix_len,
3545 ifp->scope,
971a351c 3546 (u8) ifp->flags,
1da177e4
LT		 3547 ifp->idev->dev->name);
3548 return 0;
3549}
3550
56b3d975 3551static const struct seq_operations if6_seq_ops = {
1da177e4
LT		 3552 .start = if6_seq_start,
3553 .next = if6_seq_next,
3554 .show = if6_seq_show,
3555 .stop = if6_seq_stop,
3556};
3557
3558static int if6_seq_open(struct inode *inode, struct file *file)
3559{
3c40090a
DL		 3560 return seq_open_net(inode, file, &if6_seq_ops,
3561 sizeof(struct if6_iter_state));
1da177e4
LT		 3562}
3563
9a32144e 3564static const struct file_operations if6_fops = {
1da177e4
LT		 3565 .owner = THIS_MODULE,
3566 .open = if6_seq_open,
3567 .read = seq_read,
3568 .llseek = seq_lseek,
3c40090a 3569 .release = seq_release_net,
1da177e4
LT		 3570};
3571
2c8c1e72 3572static int __net_init if6_proc_net_init(struct net *net)
1da177e4 3573{
d4beaa66 3574 if (!proc_create("if_inet6", S_IRUGO, net->proc_net, &if6_fops))
1da177e4
LT		 3575 return -ENOMEM;
3576 return 0;
3577}
3578
2c8c1e72 3579static void __net_exit if6_proc_net_exit(struct net *net)
3c40090a 3580{
ece31ffd 3581 remove_proc_entry("if_inet6", net->proc_net);
3c40090a
DL		 3582}
3583
3584static struct pernet_operations if6_proc_net_ops = {
67ba4152
IM		 3585 .init = if6_proc_net_init,
3586 .exit = if6_proc_net_exit,
3c40090a
DL		 3587};
3588
3589int __init if6_proc_init(void)
3590{
3591 return register_pernet_subsys(&if6_proc_net_ops);
3592}
3593
1da177e4
LT		 3594void if6_proc_exit(void)
3595{
3c40090a 3596 unregister_pernet_subsys(&if6_proc_net_ops);
1da177e4
LT		 3597}
3598#endif /* CONFIG_PROC_FS */
3599
07a93626 3600#if IS_ENABLED(CONFIG_IPV6_MIP6)
3b9f9a1c 3601/* Check if address is a home address configured on any interface. */
b71d1d42 3602int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr)
3b9f9a1c
NT		 3603{
3604 int ret = 0;
c2e21293 3605 struct inet6_ifaddr *ifp = NULL;
ddbe5032 3606 unsigned int hash = inet6_addr_hash(addr);
c2e21293 3607
5c578aed 3608 rcu_read_lock_bh();
b67bfe0d 3609 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
878628fb 3610 if (!net_eq(dev_net(ifp->idev->dev), net))
389f6612 3611 continue;
caad295f 3612 if (ipv6_addr_equal(&ifp->addr, addr) &&
3b9f9a1c
NT		 3613 (ifp->flags & IFA_F_HOMEADDRESS)) {
3614 ret = 1;
3615 break;
3616 }
3617 }
5c578aed 3618 rcu_read_unlock_bh();
3b9f9a1c
NT		 3619 return ret;
3620}
3621#endif
3622
1da177e4
LT		 3623/*
3624 * Periodic address status verification
3625 */
3626
c15b1cca 3627static void addrconf_verify_rtnl(void)
1da177e4 3628{
b2db7564 3629 unsigned long now, next, next_sec, next_sched;
1da177e4 3630 struct inet6_ifaddr *ifp;
1da177e4
LT		 3631 int i;
3632
c15b1cca
HFS		 3633 ASSERT_RTNL();
3634
5c578aed 3635 rcu_read_lock_bh();
1da177e4 3636 now = jiffies;
b2db7564 3637 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
1da177e4 3638
c15b1cca 3639 cancel_delayed_work(&addr_chk_work);
1da177e4 3640
bcdd553f 3641 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
1da177e4 3642restart:
c15b1cca 3643 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[i], addr_lst) {
1da177e4 3644 unsigned long age;
1da177e4 3645
fad8da3e
YA		 3646 /* When setting preferred_lft to a value not zero or
3647 * infinity, while valid_lft is infinity
3648 * IFA_F_PERMANENT has a non-infinity life time.
3649 */
3650 if ((ifp->flags & IFA_F_PERMANENT) &&
3651 (ifp->prefered_lft == INFINITY_LIFE_TIME))
1da177e4
LT		 3652 continue;
3653
3654 spin_lock(&ifp->lock);
b2db7564
YH		 3655 /* We try to batch several events at once. */
3656 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
1da177e4 3657
8f27ebb9
YH		 3658 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
3659 age >= ifp->valid_lft) {
1da177e4
LT		 3660 spin_unlock(&ifp->lock);
3661 in6_ifa_hold(ifp);
1da177e4
LT		 3662 ipv6_del_addr(ifp);
3663 goto restart;
8f27ebb9
YH		 3664 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
3665 spin_unlock(&ifp->lock);
3666 continue;
1da177e4 3667 } else if (age >= ifp->prefered_lft) {
a1ed0526 3668 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
1da177e4
LT		 3669 int deprecate = 0;
3670
3671 if (!(ifp->flags&IFA_F_DEPRECATED)) {
3672 deprecate = 1;
3673 ifp->flags |= IFA_F_DEPRECATED;
3674 }
3675
fad8da3e
YA		 3676 if ((ifp->valid_lft != INFINITY_LIFE_TIME) &&
3677 (time_before(ifp->tstamp + ifp->valid_lft * HZ, next)))
1da177e4
LT		 3678 next = ifp->tstamp + ifp->valid_lft * HZ;
3679
3680 spin_unlock(&ifp->lock);
3681
3682 if (deprecate) {
3683 in6_ifa_hold(ifp);
1da177e4
LT		 3684
3685 ipv6_ifa_notify(0, ifp);
3686 in6_ifa_put(ifp);
3687 goto restart;
3688 }
1da177e4
LT		 3689 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
3690 !(ifp->flags&IFA_F_TENTATIVE)) {
88949cf4 3691 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
3692 ifp->idev->cnf.dad_transmits *
1f9248e5 3693 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME) / HZ;
88949cf4 3694
1da177e4
LT		 3695 if (age >= ifp->prefered_lft - regen_advance) {
3696 struct inet6_ifaddr *ifpub = ifp->ifpub;
3697 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3698 next = ifp->tstamp + ifp->prefered_lft * HZ;
3699 if (!ifp->regen_count && ifpub) {
3700 ifp->regen_count++;
3701 in6_ifa_hold(ifp);
3702 in6_ifa_hold(ifpub);
3703 spin_unlock(&ifp->lock);
5c578aed 3704
291d809b
HY		 3705 spin_lock(&ifpub->lock);
3706 ifpub->regen_count = 0;
3707 spin_unlock(&ifpub->lock);
1da177e4
LT		 3708 ipv6_create_tempaddr(ifpub, ifp);
3709 in6_ifa_put(ifpub);
3710 in6_ifa_put(ifp);
3711 goto restart;
3712 }
3713 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
3714 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
3715 spin_unlock(&ifp->lock);
1da177e4
LT		 3716 } else {
3717 /* ifp->prefered_lft <= ifp->valid_lft */
3718 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3719 next = ifp->tstamp + ifp->prefered_lft * HZ;
3720 spin_unlock(&ifp->lock);
3721 }
3722 }
1da177e4
LT		 3723 }
3724
b2db7564
YH		 3725 next_sec = round_jiffies_up(next);
3726 next_sched = next;
3727
3728 /* If rounded timeout is accurate enough, accept it. */
3729 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
3730 next_sched = next_sec;
3731
3732 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
3733 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
3734 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
3735
ba3542e1 3736 ADBG(KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
3737 now, next, next_sec, next_sched);
c15b1cca 3738 mod_delayed_work(addrconf_wq, &addr_chk_work, next_sched - now);
5c578aed 3739 rcu_read_unlock_bh();
1da177e4
LT		 3740}
3741
c15b1cca
HFS		 3742static void addrconf_verify_work(struct work_struct *w)
3743{
3744 rtnl_lock();
3745 addrconf_verify_rtnl();
3746 rtnl_unlock();
3747}
3748
3749static void addrconf_verify(void)
3750{
3751 mod_delayed_work(addrconf_wq, &addr_chk_work, 0);
3752}
3753
caeaba79
ND		 3754static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local,
3755 struct in6_addr **peer_pfx)
461d8837
TG		 3756{
3757 struct in6_addr *pfx = NULL;
3758
caeaba79
ND		 3759 *peer_pfx = NULL;
3760
461d8837
TG		 3761 if (addr)
3762 pfx = nla_data(addr);
3763
3764 if (local) {
3765 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
caeaba79
ND		 3766 *peer_pfx = pfx;
3767 pfx = nla_data(local);
461d8837
TG		 3768 }
3769
3770 return pfx;
3771}
3772
ef7c79ed 3773static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
461d8837
TG		 3774 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
3775 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
3776 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
479840ff 3777 [IFA_FLAGS] = { .len = sizeof(u32) },
461d8837
TG		 3778};
3779
1da177e4 3780static int
661d2967 3781inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh)
1da177e4 3782{
3b1e0a65 3783 struct net *net = sock_net(skb->sk);
b933f716
TG		 3784 struct ifaddrmsg *ifm;
3785 struct nlattr *tb[IFA_MAX+1];
caeaba79 3786 struct in6_addr *pfx, *peer_pfx;
6046d5b4 3787 u32 ifa_flags;
b933f716 3788 int err;
1da177e4 3789
b933f716
TG		 3790 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3791 if (err < 0)
3792 return err;
3793
3794 ifm = nlmsg_data(nlh);
caeaba79 3795 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
1da177e4
LT		 3796 if (pfx == NULL)
3797 return -EINVAL;
3798
6046d5b4
HK		 3799 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
3800
3801 /* We ignore other flags so far. */
3802 ifa_flags &= IFA_F_MANAGETEMPADDR;
3803
3804 return inet6_addr_del(net, ifm->ifa_index, ifa_flags, pfx,
3805 ifm->ifa_prefixlen);
1da177e4
LT		 3806}
3807
479840ff 3808static int inet6_addr_modify(struct inet6_ifaddr *ifp, u32 ifa_flags,
55ebaef1 3809 u32 prefered_lft, u32 valid_lft)
081bba5b 3810{
6f704992
YH		 3811 u32 flags;
3812 clock_t expires;
4bed72e4 3813 unsigned long timeout;
53bd6749 3814 bool was_managetempaddr;
5b84efec 3815 bool had_prefixroute;
46d48046 3816
c15b1cca
HFS		 3817 ASSERT_RTNL();
3818
081bba5b
NT		 3819 if (!valid_lft || (prefered_lft > valid_lft))
3820 return -EINVAL;
3821
53bd6749
JP		 3822 if (ifa_flags & IFA_F_MANAGETEMPADDR &&
3823 (ifp->flags & IFA_F_TEMPORARY || ifp->prefix_len != 64))
3824 return -EINVAL;
3825
4bed72e4
YH		 3826 timeout = addrconf_timeout_fixup(valid_lft, HZ);
3827 if (addrconf_finite_timeout(timeout)) {
3828 expires = jiffies_to_clock_t(timeout * HZ);
3829 valid_lft = timeout;
6f704992 3830 flags = RTF_EXPIRES;
4bed72e4
YH		 3831 } else {
3832 expires = 0;
3833 flags = 0;
3834 ifa_flags |= IFA_F_PERMANENT;
6f704992 3835 }
081bba5b 3836
4bed72e4
YH		 3837 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
3838 if (addrconf_finite_timeout(timeout)) {
3839 if (timeout == 0)
3840 ifa_flags |= IFA_F_DEPRECATED;
3841 prefered_lft = timeout;
3842 }
081bba5b
NT		 3843
3844 spin_lock_bh(&ifp->lock);
53bd6749 3845 was_managetempaddr = ifp->flags & IFA_F_MANAGETEMPADDR;
5b84efec
TH		 3846 had_prefixroute = ifp->flags & IFA_F_PERMANENT &&
3847 !(ifp->flags & IFA_F_NOPREFIXROUTE);
53bd6749 3848 ifp->flags &= ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD |
761aac73
TH		 3849 IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
3850 IFA_F_NOPREFIXROUTE);
53bd6749 3851 ifp->flags |= ifa_flags;
081bba5b
NT		 3852 ifp->tstamp = jiffies;
3853 ifp->valid_lft = valid_lft;
3854 ifp->prefered_lft = prefered_lft;
3855
3856 spin_unlock_bh(&ifp->lock);
3857 if (!(ifp->flags&IFA_F_TENTATIVE))
3858 ipv6_ifa_notify(0, ifp);
081bba5b 3859
761aac73
TH		 3860 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) {
3861 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
3862 expires, flags);
5b84efec
TH		 3863 } else if (had_prefixroute) {
3864 enum cleanup_prefix_rt_t action;
3865 unsigned long rt_expires;
3866
3867 write_lock_bh(&ifp->idev->lock);
3868 action = check_cleanup_prefix_route(ifp, &rt_expires);
3869 write_unlock_bh(&ifp->idev->lock);
3870
3871 if (action != CLEANUP_PREFIX_RT_NOP) {
3872 cleanup_prefix_route(ifp, rt_expires,
3873 action == CLEANUP_PREFIX_RT_DEL);
3874 }
761aac73 3875 }
53bd6749
JP		 3876
3877 if (was_managetempaddr || ifp->flags & IFA_F_MANAGETEMPADDR) {
3878 if (was_managetempaddr && !(ifp->flags & IFA_F_MANAGETEMPADDR))
3879 valid_lft = prefered_lft = 0;
3880 manage_tempaddrs(ifp->idev, ifp, valid_lft, prefered_lft,
3881 !was_managetempaddr, jiffies);
3882 }
3883
c15b1cca 3884 addrconf_verify_rtnl();
081bba5b
NT		 3885
3886 return 0;
3887}
3888
1da177e4 3889static int
661d2967 3890inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh)
1da177e4 3891{
3b1e0a65 3892 struct net *net = sock_net(skb->sk);
461d8837
TG		 3893 struct ifaddrmsg *ifm;
3894 struct nlattr *tb[IFA_MAX+1];
caeaba79 3895 struct in6_addr *pfx, *peer_pfx;
7198f8ce
TG		 3896 struct inet6_ifaddr *ifa;
3897 struct net_device *dev;
55ebaef1 3898 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
479840ff 3899 u32 ifa_flags;
461d8837 3900 int err;
1da177e4 3901
461d8837
TG		 3902 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3903 if (err < 0)
3904 return err;
3905
3906 ifm = nlmsg_data(nlh);
caeaba79 3907 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
1da177e4
LT		 3908 if (pfx == NULL)
3909 return -EINVAL;
3910
461d8837 3911 if (tb[IFA_CACHEINFO]) {
0778769d 3912 struct ifa_cacheinfo *ci;
461d8837
TG		 3913
3914 ci = nla_data(tb[IFA_CACHEINFO]);
0778769d 3915 valid_lft = ci->ifa_valid;
461d8837
TG		 3916 preferred_lft = ci->ifa_prefered;
3917 } else {
3918 preferred_lft = INFINITY_LIFE_TIME;
3919 valid_lft = INFINITY_LIFE_TIME;
0778769d
NT		 3920 }
3921
af284937 3922 dev = __dev_get_by_index(net, ifm->ifa_index);
7198f8ce
TG		 3923 if (dev == NULL)
3924 return -ENODEV;
3925
479840ff
JP		 3926 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
3927
55ebaef1 3928 /* We ignore other flags so far. */
761aac73
TH		 3929 ifa_flags &= IFA_F_NODAD | IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
3930 IFA_F_NOPREFIXROUTE;
55ebaef1 3931
1cab3da6 3932 ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
7198f8ce
TG		 3933 if (ifa == NULL) {
3934 /*
3935 * It would be best to check for !NLM_F_CREATE here but
db9c7c39 3936 * userspace already relies on not having to provide this.
7198f8ce 3937 */
caeaba79 3938 return inet6_addr_add(net, ifm->ifa_index, pfx, peer_pfx,
af284937
DL		 3939 ifm->ifa_prefixlen, ifa_flags,
3940 preferred_lft, valid_lft);
081bba5b
NT		 3941 }
3942
7198f8ce
TG		 3943 if (nlh->nlmsg_flags & NLM_F_EXCL ||
3944 !(nlh->nlmsg_flags & NLM_F_REPLACE))
3945 err = -EEXIST;
3946 else
55ebaef1 3947 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
7198f8ce
TG		 3948
3949 in6_ifa_put(ifa);
3950
3951 return err;
1da177e4
LT		 3952}
3953
479840ff 3954static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u32 flags,
101bb229
TG		 3955 u8 scope, int ifindex)
3956{
3957 struct ifaddrmsg *ifm;
3958
3959 ifm = nlmsg_data(nlh);
3960 ifm->ifa_family = AF_INET6;
3961 ifm->ifa_prefixlen = prefixlen;
3962 ifm->ifa_flags = flags;
3963 ifm->ifa_scope = scope;
3964 ifm->ifa_index = ifindex;
3965}
3966
85486af0
TG		 3967static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
3968 unsigned long tstamp, u32 preferred, u32 valid)
3969{
3970 struct ifa_cacheinfo ci;
3971
18a31e1e
TG		 3972 ci.cstamp = cstamp_delta(cstamp);
3973 ci.tstamp = cstamp_delta(tstamp);
85486af0
TG		 3974 ci.ifa_prefered = preferred;
3975 ci.ifa_valid = valid;
3976
3977 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
3978}
3979
101bb229
TG		 3980static inline int rt_scope(int ifa_scope)
3981{
3982 if (ifa_scope & IFA_HOST)
3983 return RT_SCOPE_HOST;
3984 else if (ifa_scope & IFA_LINK)
3985 return RT_SCOPE_LINK;
3986 else if (ifa_scope & IFA_SITE)
3987 return RT_SCOPE_SITE;
3988 else
3989 return RT_SCOPE_UNIVERSE;
3990}
3991
0ab6803b
TG		 3992static inline int inet6_ifaddr_msgsize(void)
3993{
339bf98f 3994 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
caeaba79 3995 + nla_total_size(16) /* IFA_LOCAL */
339bf98f 3996 + nla_total_size(16) /* IFA_ADDRESS */
479840ff
JP		 3997 + nla_total_size(sizeof(struct ifa_cacheinfo))
3998 + nla_total_size(4) /* IFA_FLAGS */;
0ab6803b 3999}
c5396a31 4000
1da177e4 4001static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
15e47304 4002 u32 portid, u32 seq, int event, unsigned int flags)
1da177e4 4003{
1da177e4 4004 struct nlmsghdr *nlh;
85486af0 4005 u32 preferred, valid;
1da177e4 4006
15e47304 4007 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
0ab6803b 4008 if (nlh == NULL)
26932566 4009 return -EMSGSIZE;
0ab6803b 4010
101bb229
TG		 4011 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
4012 ifa->idev->dev->ifindex);
4013
fad8da3e
YA		 4014 if (!((ifa->flags&IFA_F_PERMANENT) &&
4015 (ifa->prefered_lft == INFINITY_LIFE_TIME))) {
85486af0
TG		 4016 preferred = ifa->prefered_lft;
4017 valid = ifa->valid_lft;
4018 if (preferred != INFINITY_LIFE_TIME) {
1da177e4 4019 long tval = (jiffies - ifa->tstamp)/HZ;
a1faa698
JR		 4020 if (preferred > tval)
4021 preferred -= tval;
4022 else
4023 preferred = 0;
f56619fc
BH		 4024 if (valid != INFINITY_LIFE_TIME) {
4025 if (valid > tval)
4026 valid -= tval;
4027 else
4028 valid = 0;
4029 }
1da177e4
LT		 4030 }
4031 } else {
85486af0
TG		 4032 preferred = INFINITY_LIFE_TIME;
4033 valid = INFINITY_LIFE_TIME;
4034 }
4035
7996c799 4036 if (!ipv6_addr_any(&ifa->peer_addr)) {
caeaba79
ND		 4037 if (nla_put(skb, IFA_LOCAL, 16, &ifa->addr) < 0 ||
4038 nla_put(skb, IFA_ADDRESS, 16, &ifa->peer_addr) < 0)
4039 goto error;
4040 } else
4041 if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0)
4042 goto error;
4043
4044 if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0)
4045 goto error;
1da177e4 4046
479840ff
JP		 4047 if (nla_put_u32(skb, IFA_FLAGS, ifa->flags) < 0)
4048 goto error;
4049
0ab6803b 4050 return nlmsg_end(skb, nlh);
caeaba79
ND		 4051
4052error:
4053 nlmsg_cancel(skb, nlh);
4054 return -EMSGSIZE;
1da177e4
LT		 4055}
4056
4057static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
15e47304 4058 u32 portid, u32 seq, int event, u16 flags)
1da177e4 4059{
1da177e4 4060 struct nlmsghdr *nlh;
101bb229
TG		 4061 u8 scope = RT_SCOPE_UNIVERSE;
4062 int ifindex = ifmca->idev->dev->ifindex;
4063
4064 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
4065 scope = RT_SCOPE_SITE;
1da177e4 4066
15e47304 4067 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
0ab6803b 4068 if (nlh == NULL)
26932566 4069 return -EMSGSIZE;
85486af0 4070
0ab6803b
TG		 4071 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
4072 if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 ||
4073 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
26932566
PM		 4074 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
4075 nlmsg_cancel(skb, nlh);
4076 return -EMSGSIZE;
4077 }
85486af0 4078
0ab6803b 4079 return nlmsg_end(skb, nlh);
1da177e4
LT		 4080}
4081
4082static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
15e47304 4083 u32 portid, u32 seq, int event, unsigned int flags)
1da177e4 4084{
1da177e4 4085 struct nlmsghdr *nlh;
101bb229
TG		 4086 u8 scope = RT_SCOPE_UNIVERSE;
4087 int ifindex = ifaca->aca_idev->dev->ifindex;
4088
4089 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
4090 scope = RT_SCOPE_SITE;
1da177e4 4091
15e47304 4092 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
0ab6803b 4093 if (nlh == NULL)
26932566 4094 return -EMSGSIZE;
85486af0 4095
0ab6803b
TG		 4096 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
4097 if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 ||
4098 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
26932566
PM		 4099 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
4100 nlmsg_cancel(skb, nlh);
4101 return -EMSGSIZE;
4102 }
1da177e4 4103
0ab6803b 4104 return nlmsg_end(skb, nlh);
1da177e4
LT		 4105}
4106
e21e8467 4107enum addr_type_t {
1da177e4
LT		 4108 UNICAST_ADDR,
4109 MULTICAST_ADDR,
4110 ANYCAST_ADDR,
4111};
4112
234b27c3
ED		 4113/* called with rcu_read_lock() */
4114static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
4115 struct netlink_callback *cb, enum addr_type_t type,
4116 int s_ip_idx, int *p_ip_idx)
4117{
234b27c3
ED		 4118 struct ifmcaddr6 *ifmca;
4119 struct ifacaddr6 *ifaca;
4120 int err = 1;
4121 int ip_idx = *p_ip_idx;
4122
4123 read_lock_bh(&idev->lock);
4124 switch (type) {
502a2ffd 4125 case UNICAST_ADDR: {
4126 struct inet6_ifaddr *ifa;
4127
234b27c3 4128 /* unicast address incl. temp addr */
502a2ffd 4129 list_for_each_entry(ifa, &idev->addr_list, if_list) {
4130 if (++ip_idx < s_ip_idx)
234b27c3
ED		 4131 continue;
4132 err = inet6_fill_ifaddr(skb, ifa,
15e47304 4133 NETLINK_CB(cb->skb).portid,
234b27c3
ED		 4134 cb->nlh->nlmsg_seq,
4135 RTM_NEWADDR,
4136 NLM_F_MULTI);
4137 if (err <= 0)
4138 break;
63998ac2 4139 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
234b27c3
ED		 4140 }
4141 break;
502a2ffd 4142 }
234b27c3
ED		 4143 case MULTICAST_ADDR:
4144 /* multicast address */
4145 for (ifmca = idev->mc_list; ifmca;
4146 ifmca = ifmca->next, ip_idx++) {
4147 if (ip_idx < s_ip_idx)
4148 continue;
4149 err = inet6_fill_ifmcaddr(skb, ifmca,
15e47304 4150 NETLINK_CB(cb->skb).portid,
234b27c3
ED		 4151 cb->nlh->nlmsg_seq,
4152 RTM_GETMULTICAST,
4153 NLM_F_MULTI);
4154 if (err <= 0)
4155 break;
4156 }
4157 break;
4158 case ANYCAST_ADDR:
4159 /* anycast address */
4160 for (ifaca = idev->ac_list; ifaca;
4161 ifaca = ifaca->aca_next, ip_idx++) {
4162 if (ip_idx < s_ip_idx)
4163 continue;
4164 err = inet6_fill_ifacaddr(skb, ifaca,
15e47304 4165 NETLINK_CB(cb->skb).portid,
234b27c3
ED		 4166 cb->nlh->nlmsg_seq,
4167 RTM_GETANYCAST,
4168 NLM_F_MULTI);
4169 if (err <= 0)
4170 break;
4171 }
4172 break;
4173 default:
4174 break;
4175 }
4176 read_unlock_bh(&idev->lock);
4177 *p_ip_idx = ip_idx;
4178 return err;
4179}
4180
1da177e4
LT		 4181static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
4182 enum addr_type_t type)
4183{
234b27c3
ED		 4184 struct net *net = sock_net(skb->sk);
4185 int h, s_h;
1da177e4
LT		 4186 int idx, ip_idx;
4187 int s_idx, s_ip_idx;
1da177e4 4188 struct net_device *dev;
234b27c3
ED		 4189 struct inet6_dev *idev;
4190 struct hlist_head *head;
1ab1457c 4191
234b27c3
ED		 4192 s_h = cb->args[0];
4193 s_idx = idx = cb->args[1];
4194 s_ip_idx = ip_idx = cb->args[2];
5d5619b4 4195
234b27c3 4196 rcu_read_lock();
63998ac2 4197 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ net->dev_base_seq;
234b27c3
ED		 4198 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4199 idx = 0;
4200 head = &net->dev_index_head[h];
b67bfe0d 4201 hlist_for_each_entry_rcu(dev, head, index_hlist) {
234b27c3
ED		 4202 if (idx < s_idx)
4203 goto cont;
4b97efdf 4204 if (h > s_h || idx > s_idx)
234b27c3
ED		 4205 s_ip_idx = 0;
4206 ip_idx = 0;
e21e8467
SH		 4207 idev = __in6_dev_get(dev);
4208 if (!idev)
234b27c3
ED		 4209 goto cont;
4210
4211 if (in6_dump_addrs(idev, skb, cb, type,
4212 s_ip_idx, &ip_idx) <= 0)
4213 goto done;
7562f876 4214cont:
234b27c3
ED		 4215 idx++;
4216 }
1da177e4 4217 }
234b27c3
ED		 4218done:
4219 rcu_read_unlock();
4220 cb->args[0] = h;
4221 cb->args[1] = idx;
4222 cb->args[2] = ip_idx;
4223
1da177e4
LT		 4224 return skb->len;
4225}
4226
4227static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
4228{
4229 enum addr_type_t type = UNICAST_ADDR;
b854272b 4230
1da177e4
LT		 4231 return inet6_dump_addr(skb, cb, type);
4232}
4233
4234static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
4235{
4236 enum addr_type_t type = MULTICAST_ADDR;
b854272b 4237
1da177e4
LT		 4238 return inet6_dump_addr(skb, cb, type);
4239}
4240
4241
4242static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
4243{
4244 enum addr_type_t type = ANYCAST_ADDR;
b854272b 4245
1da177e4
LT		 4246 return inet6_dump_addr(skb, cb, type);
4247}
4248
661d2967 4249static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh)
6c223828 4250{
3b1e0a65 4251 struct net *net = sock_net(in_skb->sk);
1b29fc2c
TG		 4252 struct ifaddrmsg *ifm;
4253 struct nlattr *tb[IFA_MAX+1];
caeaba79 4254 struct in6_addr *addr = NULL, *peer;
6c223828
NT		 4255 struct net_device *dev = NULL;
4256 struct inet6_ifaddr *ifa;
4257 struct sk_buff *skb;
6c223828
NT		 4258 int err;
4259
1b29fc2c
TG		 4260 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
4261 if (err < 0)
4262 goto errout;
4263
caeaba79 4264 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer);
1b29fc2c
TG		 4265 if (addr == NULL) {
4266 err = -EINVAL;
4267 goto errout;
6c223828 4268 }
6c223828 4269
1b29fc2c 4270 ifm = nlmsg_data(nlh);
6c223828 4271 if (ifm->ifa_index)
6fda7350 4272 dev = __dev_get_by_index(net, ifm->ifa_index);
6c223828 4273
e21e8467
SH		 4274 ifa = ipv6_get_ifaddr(net, addr, dev, 1);
4275 if (!ifa) {
1b29fc2c
TG		 4276 err = -EADDRNOTAVAIL;
4277 goto errout;
4278 }
6c223828 4279
e21e8467
SH		 4280 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
4281 if (!skb) {
6c223828 4282 err = -ENOBUFS;
1b29fc2c 4283 goto errout_ifa;
6c223828
NT		 4284 }
4285
15e47304 4286 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).portid,
6c223828 4287 nlh->nlmsg_seq, RTM_NEWADDR, 0);
26932566
PM		 4288 if (err < 0) {
4289 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4290 WARN_ON(err == -EMSGSIZE);
4291 kfree_skb(skb);
4292 goto errout_ifa;
4293 }
15e47304 4294 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
1b29fc2c 4295errout_ifa:
6c223828 4296 in6_ifa_put(ifa);
1b29fc2c 4297errout:
6c223828 4298 return err;
6c223828
NT		 4299}
4300
1da177e4
LT		 4301static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
4302{
4303 struct sk_buff *skb;
c346dca1 4304 struct net *net = dev_net(ifa->idev->dev);
5d620266 4305 int err = -ENOBUFS;
1da177e4 4306
0ab6803b 4307 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
5d620266
TG		 4308 if (skb == NULL)
4309 goto errout;
4310
4311 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
26932566
PM		 4312 if (err < 0) {
4313 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4314 WARN_ON(err == -EMSGSIZE);
4315 kfree_skb(skb);
4316 goto errout;
4317 }
1ce85fe4
PNA		 4318 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
4319 return;
5d620266
TG		 4320errout:
4321 if (err < 0)
6fda7350 4322 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
1da177e4
LT		 4323}
4324
b6f99a21 4325static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
1da177e4
LT		 4326 __s32 *array, int bytes)
4327{
04561c1f
TG		 4328 BUG_ON(bytes < (DEVCONF_MAX * 4));
4329
1da177e4
LT		 4330 memset(array, 0, bytes);
4331 array[DEVCONF_FORWARDING] = cnf->forwarding;
4332 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
4333 array[DEVCONF_MTU6] = cnf->mtu6;
4334 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
4335 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
4336 array[DEVCONF_AUTOCONF] = cnf->autoconf;
4337 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
4338 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
93908d19
TG		 4339 array[DEVCONF_RTR_SOLICIT_INTERVAL] =
4340 jiffies_to_msecs(cnf->rtr_solicit_interval);
4341 array[DEVCONF_RTR_SOLICIT_DELAY] =
4342 jiffies_to_msecs(cnf->rtr_solicit_delay);
1da177e4 4343 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
fc4eba58
HFS		 4344 array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] =
4345 jiffies_to_msecs(cnf->mldv1_unsolicited_report_interval);
4346 array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] =
4347 jiffies_to_msecs(cnf->mldv2_unsolicited_report_interval);
1da177e4
LT		 4348 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
4349 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
4350 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
4351 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
4352 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
1da177e4 4353 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
65f5c7c1 4354 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
c4fd30eb 4355 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
930d6ff2
YH		 4356#ifdef CONFIG_IPV6_ROUTER_PREF
4357 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
93908d19
TG		 4358 array[DEVCONF_RTR_PROBE_INTERVAL] =
4359 jiffies_to_msecs(cnf->rtr_probe_interval);
fa03ef38 4360#ifdef CONFIG_IPV6_ROUTE_INFO
09c884d4
YH		 4361 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
4362#endif
930d6ff2 4363#endif
fbea49e1 4364 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
0bcbc926 4365 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
95c385b4
NH		 4366#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4367 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
7fd2561e 4368 array[DEVCONF_USE_OPTIMISTIC] = cnf->use_optimistic;
95c385b4 4369#endif
7bc570c8
YH		 4370#ifdef CONFIG_IPV6_MROUTE
4371 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
4372#endif
778d80be 4373 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
1b34be74 4374 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
c3faca05 4375 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
5cb04436 4376 array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify;
b800c3b9 4377 array[DEVCONF_SUPPRESS_FRAG_NDISC] = cnf->suppress_frag_ndisc;
d9333196 4378 array[DEVCONF_ACCEPT_RA_FROM_LOCAL] = cnf->accept_ra_from_local;
1da177e4
LT		 4379}
4380
b382b191
TG		 4381static inline size_t inet6_ifla6_size(void)
4382{
4383 return nla_total_size(4) /* IFLA_INET6_FLAGS */
4384 + nla_total_size(sizeof(struct ifla_cacheinfo))
4385 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
4386 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
f53adae4
DB		 4387 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
4388 + nla_total_size(sizeof(struct in6_addr)); /* IFLA_INET6_TOKEN */
b382b191
TG		 4389}
4390
339bf98f
TG		 4391static inline size_t inet6_if_nlmsg_size(void)
4392{
4393 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
4394 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
4395 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
4396 + nla_total_size(4) /* IFLA_MTU */
4397 + nla_total_size(4) /* IFLA_LINK */
b382b191 4398 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */
339bf98f 4399}
c5396a31 4400
be281e55 4401static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib,
7d720c3e 4402 int items, int bytes)
7f7d9a6b
HX		 4403{
4404 int i;
4405 int pad = bytes - sizeof(u64) * items;
4406 BUG_ON(pad < 0);
4407
4408 /* Use put_unaligned() because stats may not be aligned for u64. */
4409 put_unaligned(items, &stats[0]);
4410 for (i = 1; i < items; i++)
be281e55 4411 put_unaligned(atomic_long_read(&mib[i]), &stats[i]);
7f7d9a6b
HX		 4412
4413 memset(&stats[items], 0, pad);
4414}
4415
698365fa 4416static inline void __snmp6_fill_stats64(u64 *stats, void __percpu *mib,
4ce3c183
ED		 4417 int items, int bytes, size_t syncpoff)
4418{
4419 int i;
4420 int pad = bytes - sizeof(u64) * items;
4421 BUG_ON(pad < 0);
4422
4423 /* Use put_unaligned() because stats may not be aligned for u64. */
4424 put_unaligned(items, &stats[0]);
4425 for (i = 1; i < items; i++)
4426 put_unaligned(snmp_fold_field64(mib, i, syncpoff), &stats[i]);
4427
4428 memset(&stats[items], 0, pad);
4429}
4430
7f7d9a6b
HX		 4431static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
4432 int bytes)
4433{
e21e8467 4434 switch (attrtype) {
7f7d9a6b 4435 case IFLA_INET6_STATS:
698365fa 4436 __snmp6_fill_stats64(stats, idev->stats.ipv6,
4ce3c183 4437 IPSTATS_MIB_MAX, bytes, offsetof(struct ipstats_mib, syncp));
7f7d9a6b
HX		 4438 break;
4439 case IFLA_INET6_ICMP6STATS:
be281e55 4440 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, ICMP6_MIB_MAX, bytes);
7f7d9a6b
HX		 4441 break;
4442 }
4443}
4444
b382b191
TG		 4445static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev)
4446{
4447 struct nlattr *nla;
4448 struct ifla_cacheinfo ci;
4449
c78679e8
DM		 4450 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags))
4451 goto nla_put_failure;
b382b191 4452 ci.max_reasm_len = IPV6_MAXPLEN;
24912420
DM		 4453 ci.tstamp = cstamp_delta(idev->tstamp);
4454 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time);
1f9248e5 4455 ci.retrans_time = jiffies_to_msecs(NEIGH_VAR(idev->nd_parms, RETRANS_TIME));
c78679e8
DM		 4456 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci))
4457 goto nla_put_failure;
b382b191
TG		 4458 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
4459 if (nla == NULL)
4460 goto nla_put_failure;
4461 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
4462
4463 /* XXX - MC not implemented */
4464
4465 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
4466 if (nla == NULL)
4467 goto nla_put_failure;
4468 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
4469
4470 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
4471 if (nla == NULL)
4472 goto nla_put_failure;
4473 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
4474
f53adae4
DB		 4475 nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr));
4476 if (nla == NULL)
4477 goto nla_put_failure;
bc91b0f0
JP		 4478
4479 if (nla_put_u8(skb, IFLA_INET6_ADDR_GEN_MODE, idev->addr_gen_mode))
4480 goto nla_put_failure;
4481
f53adae4
DB		 4482 read_lock_bh(&idev->lock);
4483 memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla));
4484 read_unlock_bh(&idev->lock);
4485
b382b191
TG		 4486 return 0;
4487
4488nla_put_failure:
4489 return -EMSGSIZE;
4490}
4491
4492static size_t inet6_get_link_af_size(const struct net_device *dev)
4493{
4494 if (!__in6_dev_get(dev))
4495 return 0;
4496
4497 return inet6_ifla6_size();
4498}
4499
4500static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev)
4501{
4502 struct inet6_dev *idev = __in6_dev_get(dev);
4503
4504 if (!idev)
4505 return -ENODATA;
4506
4507 if (inet6_fill_ifla6_attrs(skb, idev) < 0)
4508 return -EMSGSIZE;
4509
4510 return 0;
4511}
4512
f53adae4
DB		 4513static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token)
4514{
f53adae4
DB		 4515 struct inet6_ifaddr *ifp;
4516 struct net_device *dev = idev->dev;
fc403832 4517 bool update_rs = false;
dc848292 4518 struct in6_addr ll_addr;
f53adae4 4519
c15b1cca
HFS		 4520 ASSERT_RTNL();
4521
f53adae4
DB		 4522 if (token == NULL)
4523 return -EINVAL;
4524 if (ipv6_addr_any(token))
4525 return -EINVAL;
4526 if (dev->flags & (IFF_LOOPBACK | IFF_NOARP))
4527 return -EINVAL;
f53adae4
DB		 4528 if (!ipv6_accept_ra(idev))
4529 return -EINVAL;
4530 if (idev->cnf.rtr_solicits <= 0)
4531 return -EINVAL;
4532
4533 write_lock_bh(&idev->lock);
4534
4535 BUILD_BUG_ON(sizeof(token->s6_addr) != 16);
4536 memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8);
4537
4538 write_unlock_bh(&idev->lock);
4539
dc848292
HFS		 4540 if (!idev->dead && (idev->if_flags & IF_READY) &&
4541 !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE |
4542 IFA_F_OPTIMISTIC)) {
fc403832
DB		 4543
4544 /* If we're not ready, then normal ifup will take care
4545 * of this. Otherwise, we need to request our rs here.
4546 */
4547 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters);
4548 update_rs = true;
4549 }
f53adae4
DB		 4550
4551 write_lock_bh(&idev->lock);
fc403832 4552
77ecaace 4553 if (update_rs) {
fc403832 4554 idev->if_flags |= IF_RS_SENT;
77ecaace
HFS		 4555 idev->rs_probes = 1;
4556 addrconf_mod_rs_timer(idev, idev->cnf.rtr_solicit_interval);
4557 }
f53adae4
DB		 4558
4559 /* Well, that's kinda nasty ... */
4560 list_for_each_entry(ifp, &idev->addr_list, if_list) {
4561 spin_lock(&ifp->lock);
617fe29d 4562 if (ifp->tokenized) {
f53adae4
DB		 4563 ifp->valid_lft = 0;
4564 ifp->prefered_lft = 0;
4565 }
4566 spin_unlock(&ifp->lock);
4567 }
4568
4569 write_unlock_bh(&idev->lock);
b2ed64a9 4570 inet6_ifinfo_notify(RTM_NEWLINK, idev);
c15b1cca 4571 addrconf_verify_rtnl();
f53adae4
DB		 4572 return 0;
4573}
4574
4575static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla)
4576{
4577 int err = -EINVAL;
4578 struct inet6_dev *idev = __in6_dev_get(dev);
4579 struct nlattr *tb[IFLA_INET6_MAX + 1];
4580
4581 if (!idev)
4582 return -EAFNOSUPPORT;
4583
4584 if (nla_parse_nested(tb, IFLA_INET6_MAX, nla, NULL) < 0)
4585 BUG();
4586
bc91b0f0 4587 if (tb[IFLA_INET6_TOKEN]) {
f53adae4 4588 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN]));
bc91b0f0
JP		 4589 if (err)
4590 return err;
4591 }
4592
4593 if (tb[IFLA_INET6_ADDR_GEN_MODE]) {
4594 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]);
4595
4596 if (mode != IN6_ADDR_GEN_MODE_EUI64 &&
4597 mode != IN6_ADDR_GEN_MODE_NONE)
4598 return -EINVAL;
4599 idev->addr_gen_mode = mode;
4600 err = 0;
4601 }
f53adae4
DB		 4602
4603 return err;
4604}
4605
1ab1457c 4606static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
15e47304 4607 u32 portid, u32 seq, int event, unsigned int flags)
1da177e4 4608{
04561c1f 4609 struct net_device *dev = idev->dev;
04561c1f
TG		 4610 struct ifinfomsg *hdr;
4611 struct nlmsghdr *nlh;
4612 void *protoinfo;
04561c1f 4613
15e47304 4614 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags);
04561c1f 4615 if (nlh == NULL)
26932566 4616 return -EMSGSIZE;
04561c1f
TG		 4617
4618 hdr = nlmsg_data(nlh);
4619 hdr->ifi_family = AF_INET6;
4620 hdr->__ifi_pad = 0;
4621 hdr->ifi_type = dev->type;
4622 hdr->ifi_index = dev->ifindex;
4623 hdr->ifi_flags = dev_get_flags(dev);
4624 hdr->ifi_change = 0;
4625
c78679e8
DM		 4626 if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
4627 (dev->addr_len &&
4628 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
4629 nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
4630 (dev->ifindex != dev->iflink &&
4631 nla_put_u32(skb, IFLA_LINK, dev->iflink)))
4632 goto nla_put_failure;
04561c1f
TG		 4633 protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
4634 if (protoinfo == NULL)
4635 goto nla_put_failure;
1da177e4 4636
b382b191 4637 if (inet6_fill_ifla6_attrs(skb, idev) < 0)
bf99f1bd 4638 goto nla_put_failure;
1da177e4 4639
04561c1f
TG		 4640 nla_nest_end(skb, protoinfo);
4641 return nlmsg_end(skb, nlh);
1da177e4 4642
04561c1f 4643nla_put_failure:
26932566
PM		 4644 nlmsg_cancel(skb, nlh);
4645 return -EMSGSIZE;
1da177e4
LT		 4646}
4647
4648static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
4649{
3b1e0a65 4650 struct net *net = sock_net(skb->sk);
84d2697d 4651 int h, s_h;
434a8a58 4652 int idx = 0, s_idx;
1da177e4
LT		 4653 struct net_device *dev;
4654 struct inet6_dev *idev;
84d2697d 4655 struct hlist_head *head;
1da177e4 4656
84d2697d
ED		 4657 s_h = cb->args[0];
4658 s_idx = cb->args[1];
4659
4660 rcu_read_lock();
4661 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4662 idx = 0;
4663 head = &net->dev_index_head[h];
b67bfe0d 4664 hlist_for_each_entry_rcu(dev, head, index_hlist) {
84d2697d
ED		 4665 if (idx < s_idx)
4666 goto cont;
4667 idev = __in6_dev_get(dev);
4668 if (!idev)
4669 goto cont;
4670 if (inet6_fill_ifinfo(skb, idev,
15e47304 4671 NETLINK_CB(cb->skb).portid,
84d2697d
ED		 4672 cb->nlh->nlmsg_seq,
4673 RTM_NEWLINK, NLM_F_MULTI) <= 0)
4674 goto out;
7562f876 4675cont:
84d2697d
ED		 4676 idx++;
4677 }
1da177e4 4678 }
84d2697d
ED		 4679out:
4680 rcu_read_unlock();
4681 cb->args[1] = idx;
4682 cb->args[0] = h;
1da177e4
LT		 4683
4684 return skb->len;
4685}
4686
4687void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
4688{
4689 struct sk_buff *skb;
c346dca1 4690 struct net *net = dev_net(idev->dev);
8d7a76c9 4691 int err = -ENOBUFS;
1ab1457c 4692
339bf98f 4693 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
8d7a76c9
TG		 4694 if (skb == NULL)
4695 goto errout;
4696
4697 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
26932566
PM		 4698 if (err < 0) {
4699 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
4700 WARN_ON(err == -EMSGSIZE);
4701 kfree_skb(skb);
4702 goto errout;
4703 }
5f75a104 4704 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC);
1ce85fe4 4705 return;
8d7a76c9
TG		 4706errout:
4707 if (err < 0)
5f75a104 4708 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err);
1da177e4
LT		 4709}
4710
339bf98f
TG		 4711static inline size_t inet6_prefix_nlmsg_size(void)
4712{
4713 return NLMSG_ALIGN(sizeof(struct prefixmsg))
4714 + nla_total_size(sizeof(struct in6_addr))
4715 + nla_total_size(sizeof(struct prefix_cacheinfo));
4716}
c5396a31 4717
1da177e4 4718static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
15e47304 4719 struct prefix_info *pinfo, u32 portid, u32 seq,
6051e2f4 4720 int event, unsigned int flags)
1da177e4 4721{
6051e2f4
TG		 4722 struct prefixmsg *pmsg;
4723 struct nlmsghdr *nlh;
1da177e4
LT		 4724 struct prefix_cacheinfo ci;
4725
15e47304 4726 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags);
6051e2f4 4727 if (nlh == NULL)
26932566 4728 return -EMSGSIZE;
6051e2f4
TG		 4729
4730 pmsg = nlmsg_data(nlh);
1da177e4 4731 pmsg->prefix_family = AF_INET6;
8a47077a
PM		 4732 pmsg->prefix_pad1 = 0;
4733 pmsg->prefix_pad2 = 0;
1da177e4
LT		 4734 pmsg->prefix_ifindex = idev->dev->ifindex;
4735 pmsg->prefix_len = pinfo->prefix_len;
4736 pmsg->prefix_type = pinfo->type;
8a47077a 4737 pmsg->prefix_pad3 = 0;
1da177e4
LT		 4738 pmsg->prefix_flags = 0;
4739 if (pinfo->onlink)
4740 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
4741 if (pinfo->autoconf)
4742 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
4743
c78679e8
DM		 4744 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix))
4745 goto nla_put_failure;
1da177e4
LT		 4746 ci.preferred_time = ntohl(pinfo->prefered);
4747 ci.valid_time = ntohl(pinfo->valid);
c78679e8
DM		 4748 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci))
4749 goto nla_put_failure;
6051e2f4 4750 return nlmsg_end(skb, nlh);
1da177e4 4751
6051e2f4 4752nla_put_failure:
26932566
PM		 4753 nlmsg_cancel(skb, nlh);
4754 return -EMSGSIZE;
1da177e4
LT		 4755}
4756
1ab1457c 4757static void inet6_prefix_notify(int event, struct inet6_dev *idev,
1da177e4
LT		 4758 struct prefix_info *pinfo)
4759{
4760 struct sk_buff *skb;
c346dca1 4761 struct net *net = dev_net(idev->dev);
8c384bfa 4762 int err = -ENOBUFS;
1da177e4 4763
339bf98f 4764 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
8c384bfa
TG		 4765 if (skb == NULL)
4766 goto errout;
4767
4768 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
26932566
PM		 4769 if (err < 0) {
4770 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
4771 WARN_ON(err == -EMSGSIZE);
4772 kfree_skb(skb);
4773 goto errout;
4774 }
1ce85fe4
PNA		 4775 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
4776 return;
8c384bfa
TG		 4777errout:
4778 if (err < 0)
6fda7350 4779 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
1da177e4
LT		 4780}
4781
1da177e4
LT		 4782static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4783{
63998ac2
ND		 4784 struct net *net = dev_net(ifp->idev->dev);
4785
c15b1cca
HFS		 4786 if (event)
4787 ASSERT_RTNL();
4788
1da177e4
LT		 4789 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
4790
4791 switch (event) {
4792 case RTM_NEWADDR:
95c385b4
NH		 4793 /*
4794 * If the address was optimistic
4795 * we inserted the route at the start of
4796 * our DAD process, so we don't need
4797 * to do it again
4798 */
4799 if (!(ifp->rt->rt6i_node))
4800 ip6_ins_rt(ifp->rt);
1da177e4
LT		 4801 if (ifp->idev->cnf.forwarding)
4802 addrconf_join_anycast(ifp);
7996c799 4803 if (!ipv6_addr_any(&ifp->peer_addr))
caeaba79
ND		 4804 addrconf_prefix_route(&ifp->peer_addr, 128,
4805 ifp->idev->dev, 0, 0);
1da177e4
LT		 4806 break;
4807 case RTM_DELADDR:
4808 if (ifp->idev->cnf.forwarding)
4809 addrconf_leave_anycast(ifp);
4810 addrconf_leave_solict(ifp->idev, &ifp->addr);
7996c799 4811 if (!ipv6_addr_any(&ifp->peer_addr)) {
caeaba79 4812 struct rt6_info *rt;
caeaba79 4813
e7478dfc
ND		 4814 rt = addrconf_get_prefix_route(&ifp->peer_addr, 128,
4815 ifp->idev->dev, 0, 0);
f24062b0
ND		 4816 if (rt && ip6_del_rt(rt))
4817 dst_free(&rt->dst);
caeaba79 4818 }
d8d1f30b 4819 dst_hold(&ifp->rt->dst);
93fa159a 4820
73a8bd74 4821 if (ip6_del_rt(ifp->rt))
d8d1f30b 4822 dst_free(&ifp->rt->dst);
705f1c86
HFS		 4823
4824 rt_genid_bump_ipv6(net);
1da177e4
LT		 4825 break;
4826 }
63998ac2 4827 atomic_inc(&net->ipv6.dev_addr_genid);
1da177e4
LT		 4828}
4829
4830static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4831{
8814c4b5 4832 rcu_read_lock_bh();
1da177e4
LT		 4833 if (likely(ifp->idev->dead == 0))
4834 __ipv6_ifa_notify(event, ifp);
8814c4b5 4835 rcu_read_unlock_bh();
1da177e4
LT		 4836}
4837
4838#ifdef CONFIG_SYSCTL
4839
4840static
fe2c6338 4841int addrconf_sysctl_forward(struct ctl_table *ctl, int write,
1da177e4
LT		 4842 void __user *buffer, size_t *lenp, loff_t *ppos)
4843{
4844 int *valp = ctl->data;
4845 int val = *valp;
88af182e 4846 loff_t pos = *ppos;
fe2c6338 4847 struct ctl_table lctl;
1da177e4
LT		 4848 int ret;
4849
013d97e9
FR		 4850 /*
4851 * ctl->data points to idev->cnf.forwarding, we should
4852 * not modify it until we get the rtnl lock.
4853 */
4854 lctl = *ctl;
4855 lctl.data = &val;
4856
4857 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
1da177e4 4858
c8fecf22 4859 if (write)
b325fddb 4860 ret = addrconf_fixup_forwarding(ctl, valp, val);
88af182e
EB		 4861 if (ret)
4862 *ppos = pos;
1ab1457c 4863 return ret;
1da177e4
LT		 4864}
4865
56d417b1
BH		 4866static void dev_disable_change(struct inet6_dev *idev)
4867{
75538c2b
CW		 4868 struct netdev_notifier_info info;
4869
56d417b1
BH		 4870 if (!idev || !idev->dev)
4871 return;
4872
75538c2b 4873 netdev_notifier_info_init(&info, idev->dev);
56d417b1 4874 if (idev->cnf.disable_ipv6)
75538c2b 4875 addrconf_notify(NULL, NETDEV_DOWN, &info);
56d417b1 4876 else
75538c2b 4877 addrconf_notify(NULL, NETDEV_UP, &info);
56d417b1
BH		 4878}
4879
4880static void addrconf_disable_change(struct net *net, __s32 newf)
4881{
4882 struct net_device *dev;
4883 struct inet6_dev *idev;
4884
c6d14c84
ED		 4885 rcu_read_lock();
4886 for_each_netdev_rcu(net, dev) {
56d417b1
BH		 4887 idev = __in6_dev_get(dev);
4888 if (idev) {
4889 int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
4890 idev->cnf.disable_ipv6 = newf;
4891 if (changed)
4892 dev_disable_change(idev);
4893 }
56d417b1 4894 }
c6d14c84 4895 rcu_read_unlock();
56d417b1
BH		 4896}
4897
013d97e9 4898static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf)
56d417b1
BH		 4899{
4900 struct net *net;
013d97e9
FR		 4901 int old;
4902
4903 if (!rtnl_trylock())
4904 return restart_syscall();
56d417b1
BH		 4905
4906 net = (struct net *)table->extra2;
013d97e9
FR		 4907 old = *p;
4908 *p = newf;
56d417b1 4909
013d97e9
FR		 4910 if (p == &net->ipv6.devconf_dflt->disable_ipv6) {
4911 rtnl_unlock();
56d417b1 4912 return 0;
88af182e 4913 }
56d417b1
BH		 4914
4915 if (p == &net->ipv6.devconf_all->disable_ipv6) {
56d417b1
BH		 4916 net->ipv6.devconf_dflt->disable_ipv6 = newf;
4917 addrconf_disable_change(net, newf);
013d97e9 4918 } else if ((!newf) ^ (!old))
56d417b1
BH		 4919 dev_disable_change((struct inet6_dev *)table->extra1);
4920
4921 rtnl_unlock();
4922 return 0;
4923}
4924
4925static
fe2c6338 4926int addrconf_sysctl_disable(struct ctl_table *ctl, int write,
56d417b1
BH		 4927 void __user *buffer, size_t *lenp, loff_t *ppos)
4928{
4929 int *valp = ctl->data;
4930 int val = *valp;
88af182e 4931 loff_t pos = *ppos;
fe2c6338 4932 struct ctl_table lctl;
56d417b1
BH		 4933 int ret;
4934
013d97e9
FR		 4935 /*
4936 * ctl->data points to idev->cnf.disable_ipv6, we should
4937 * not modify it until we get the rtnl lock.
4938 */
4939 lctl = *ctl;
4940 lctl.data = &val;
4941
4942 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
56d417b1
BH		 4943
4944 if (write)
4945 ret = addrconf_disable_ipv6(ctl, valp, val);
88af182e
EB		 4946 if (ret)
4947 *ppos = pos;
56d417b1
BH		 4948 return ret;
4949}
4950
c92d5491 4951static
4952int addrconf_sysctl_proxy_ndp(struct ctl_table *ctl, int write,
4953 void __user *buffer, size_t *lenp, loff_t *ppos)
4954{
4955 int *valp = ctl->data;
4956 int ret;
4957 int old, new;
4958
4959 old = *valp;
4960 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
4961 new = *valp;
4962
4963 if (write && old != new) {
4964 struct net *net = ctl->extra2;
4965
4966 if (!rtnl_trylock())
4967 return restart_syscall();
4968
4969 if (valp == &net->ipv6.devconf_dflt->proxy_ndp)
4970 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
4971 NETCONFA_IFINDEX_DEFAULT,
4972 net->ipv6.devconf_dflt);
4973 else if (valp == &net->ipv6.devconf_all->proxy_ndp)
4974 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
4975 NETCONFA_IFINDEX_ALL,
4976 net->ipv6.devconf_all);
4977 else {
4978 struct inet6_dev *idev = ctl->extra1;
4979
4980 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
4981 idev->dev->ifindex,
4982 &idev->cnf);
4983 }
4984 rtnl_unlock();
4985 }
4986
4987 return ret;
4988}
4989
4990
1da177e4
LT		 4991static struct addrconf_sysctl_table
4992{
4993 struct ctl_table_header *sysctl_header;
fe2c6338 4994 struct ctl_table addrconf_vars[DEVCONF_MAX+1];
ab32ea5d 4995} addrconf_sysctl __read_mostly = {
1da177e4
LT		 4996 .sysctl_header = NULL,
4997 .addrconf_vars = {
1ab1457c 4998 {
e21e8467
SH		 4999 .procname = "forwarding",
5000 .data = &ipv6_devconf.forwarding,
5001 .maxlen = sizeof(int),
5002 .mode = 0644,
5003 .proc_handler = addrconf_sysctl_forward,
1da177e4
LT		 5004 },
5005 {
e21e8467
SH		 5006 .procname = "hop_limit",
5007 .data = &ipv6_devconf.hop_limit,
5008 .maxlen = sizeof(int),
5009 .mode = 0644,
5010 .proc_handler = proc_dointvec,
1da177e4
LT		 5011 },
5012 {
e21e8467
SH		 5013 .procname = "mtu",
5014 .data = &ipv6_devconf.mtu6,
5015 .maxlen = sizeof(int),
5016 .mode = 0644,
5017 .proc_handler = proc_dointvec,
1da177e4
LT		 5018 },
5019 {
e21e8467
SH		 5020 .procname = "accept_ra",
5021 .data = &ipv6_devconf.accept_ra,
5022 .maxlen = sizeof(int),
5023 .mode = 0644,
5024 .proc_handler = proc_dointvec,
1da177e4
LT		 5025 },
5026 {
e21e8467
SH		 5027 .procname = "accept_redirects",
5028 .data = &ipv6_devconf.accept_redirects,
5029 .maxlen = sizeof(int),
5030 .mode = 0644,
5031 .proc_handler = proc_dointvec,
1da177e4
LT		 5032 },
5033 {
e21e8467
SH		 5034 .procname = "autoconf",
5035 .data = &ipv6_devconf.autoconf,
5036 .maxlen = sizeof(int),
5037 .mode = 0644,
5038 .proc_handler = proc_dointvec,
1da177e4
LT		 5039 },
5040 {
e21e8467
SH		 5041 .procname = "dad_transmits",
5042 .data = &ipv6_devconf.dad_transmits,
5043 .maxlen = sizeof(int),
5044 .mode = 0644,
5045 .proc_handler = proc_dointvec,
1da177e4
LT		 5046 },
5047 {
e21e8467
SH		 5048 .procname = "router_solicitations",
5049 .data = &ipv6_devconf.rtr_solicits,
5050 .maxlen = sizeof(int),
5051 .mode = 0644,
5052 .proc_handler = proc_dointvec,
1da177e4
LT		 5053 },
5054 {
e21e8467
SH		 5055 .procname = "router_solicitation_interval",
5056 .data = &ipv6_devconf.rtr_solicit_interval,
5057 .maxlen = sizeof(int),
5058 .mode = 0644,
5059 .proc_handler = proc_dointvec_jiffies,
1da177e4
LT		 5060 },
5061 {
e21e8467
SH		 5062 .procname = "router_solicitation_delay",
5063 .data = &ipv6_devconf.rtr_solicit_delay,
5064 .maxlen = sizeof(int),
5065 .mode = 0644,
5066 .proc_handler = proc_dointvec_jiffies,
1da177e4
LT		 5067 },
5068 {
e21e8467
SH		 5069 .procname = "force_mld_version",
5070 .data = &ipv6_devconf.force_mld_version,
5071 .maxlen = sizeof(int),
5072 .mode = 0644,
5073 .proc_handler = proc_dointvec,
1da177e4 5074 },
fc4eba58
HFS		 5075 {
5076 .procname = "mldv1_unsolicited_report_interval",
5077 .data =
5078 &ipv6_devconf.mldv1_unsolicited_report_interval,
5079 .maxlen = sizeof(int),
5080 .mode = 0644,
5081 .proc_handler = proc_dointvec_ms_jiffies,
5082 },
5083 {
5084 .procname = "mldv2_unsolicited_report_interval",
5085 .data =
5086 &ipv6_devconf.mldv2_unsolicited_report_interval,
5087 .maxlen = sizeof(int),
5088 .mode = 0644,
5089 .proc_handler = proc_dointvec_ms_jiffies,
5090 },
1da177e4 5091 {
e21e8467
SH		 5092 .procname = "use_tempaddr",
5093 .data = &ipv6_devconf.use_tempaddr,
5094 .maxlen = sizeof(int),
5095 .mode = 0644,
5096 .proc_handler = proc_dointvec,
1da177e4
LT		 5097 },
5098 {
e21e8467
SH		 5099 .procname = "temp_valid_lft",
5100 .data = &ipv6_devconf.temp_valid_lft,
5101 .maxlen = sizeof(int),
5102 .mode = 0644,
5103 .proc_handler = proc_dointvec,
1da177e4
LT		 5104 },
5105 {
e21e8467
SH		 5106 .procname = "temp_prefered_lft",
5107 .data = &ipv6_devconf.temp_prefered_lft,
5108 .maxlen = sizeof(int),
5109 .mode = 0644,
5110 .proc_handler = proc_dointvec,
1da177e4
LT		 5111 },
5112 {
e21e8467
SH		 5113 .procname = "regen_max_retry",
5114 .data = &ipv6_devconf.regen_max_retry,
5115 .maxlen = sizeof(int),
5116 .mode = 0644,
5117 .proc_handler = proc_dointvec,
1da177e4
LT		 5118 },
5119 {
e21e8467
SH		 5120 .procname = "max_desync_factor",
5121 .data = &ipv6_devconf.max_desync_factor,
5122 .maxlen = sizeof(int),
5123 .mode = 0644,
5124 .proc_handler = proc_dointvec,
1da177e4 5125 },
1da177e4 5126 {
e21e8467
SH		 5127 .procname = "max_addresses",
5128 .data = &ipv6_devconf.max_addresses,
5129 .maxlen = sizeof(int),
5130 .mode = 0644,
5131 .proc_handler = proc_dointvec,
1da177e4 5132 },
65f5c7c1 5133 {
e21e8467
SH		 5134 .procname = "accept_ra_defrtr",
5135 .data = &ipv6_devconf.accept_ra_defrtr,
5136 .maxlen = sizeof(int),
5137 .mode = 0644,
5138 .proc_handler = proc_dointvec,
65f5c7c1 5139 },
c4fd30eb 5140 {
e21e8467
SH		 5141 .procname = "accept_ra_pinfo",
5142 .data = &ipv6_devconf.accept_ra_pinfo,
5143 .maxlen = sizeof(int),
5144 .mode = 0644,
5145 .proc_handler = proc_dointvec,
c4fd30eb 5146 },
930d6ff2
YH		 5147#ifdef CONFIG_IPV6_ROUTER_PREF
5148 {
e21e8467
SH		 5149 .procname = "accept_ra_rtr_pref",
5150 .data = &ipv6_devconf.accept_ra_rtr_pref,
5151 .maxlen = sizeof(int),
5152 .mode = 0644,
5153 .proc_handler = proc_dointvec,
930d6ff2 5154 },
52e16356 5155 {
e21e8467
SH		 5156 .procname = "router_probe_interval",
5157 .data = &ipv6_devconf.rtr_probe_interval,
5158 .maxlen = sizeof(int),
5159 .mode = 0644,
5160 .proc_handler = proc_dointvec_jiffies,
52e16356 5161 },
fa03ef38 5162#ifdef CONFIG_IPV6_ROUTE_INFO
09c884d4 5163 {
e21e8467
SH		 5164 .procname = "accept_ra_rt_info_max_plen",
5165 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
5166 .maxlen = sizeof(int),
5167 .mode = 0644,
5168 .proc_handler = proc_dointvec,
09c884d4
YH		 5169 },
5170#endif
930d6ff2 5171#endif
fbea49e1 5172 {
e21e8467
SH		 5173 .procname = "proxy_ndp",
5174 .data = &ipv6_devconf.proxy_ndp,
5175 .maxlen = sizeof(int),
5176 .mode = 0644,
c92d5491 5177 .proc_handler = addrconf_sysctl_proxy_ndp,
fbea49e1 5178 },
0bcbc926 5179 {
e21e8467
SH		 5180 .procname = "accept_source_route",
5181 .data = &ipv6_devconf.accept_source_route,
5182 .maxlen = sizeof(int),
5183 .mode = 0644,
5184 .proc_handler = proc_dointvec,
0bcbc926 5185 },
95c385b4
NH		 5186#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
5187 {
e21e8467
SH		 5188 .procname = "optimistic_dad",
5189 .data = &ipv6_devconf.optimistic_dad,
5190 .maxlen = sizeof(int),
5191 .mode = 0644,
5192 .proc_handler = proc_dointvec,
95c385b4
NH		 5193
5194 },
7fd2561e
EK		 5195 {
5196 .procname = "use_optimistic",
5197 .data = &ipv6_devconf.use_optimistic,
5198 .maxlen = sizeof(int),
5199 .mode = 0644,
5200 .proc_handler = proc_dointvec,
5201
5202 },
7bc570c8
YH		 5203#endif
5204#ifdef CONFIG_IPV6_MROUTE
5205 {
e21e8467
SH		 5206 .procname = "mc_forwarding",
5207 .data = &ipv6_devconf.mc_forwarding,
5208 .maxlen = sizeof(int),
5209 .mode = 0444,
5210 .proc_handler = proc_dointvec,
7bc570c8 5211 },
95c385b4 5212#endif
778d80be 5213 {
e21e8467
SH		 5214 .procname = "disable_ipv6",
5215 .data = &ipv6_devconf.disable_ipv6,
5216 .maxlen = sizeof(int),
5217 .mode = 0644,
5218 .proc_handler = addrconf_sysctl_disable,
778d80be 5219 },
1b34be74 5220 {
e21e8467
SH		 5221 .procname = "accept_dad",
5222 .data = &ipv6_devconf.accept_dad,
5223 .maxlen = sizeof(int),
5224 .mode = 0644,
5225 .proc_handler = proc_dointvec,
1b34be74 5226 },
f7734fdf 5227 {
f7734fdf
OP		 5228 .procname = "force_tllao",
5229 .data = &ipv6_devconf.force_tllao,
5230 .maxlen = sizeof(int),
5231 .mode = 0644,
5232 .proc_handler = proc_dointvec
5233 },
5cb04436
HFS		 5234 {
5235 .procname = "ndisc_notify",
5236 .data = &ipv6_devconf.ndisc_notify,
5237 .maxlen = sizeof(int),
5238 .mode = 0644,
5239 .proc_handler = proc_dointvec
5240 },
b800c3b9
HFS		 5241 {
5242 .procname = "suppress_frag_ndisc",
5243 .data = &ipv6_devconf.suppress_frag_ndisc,
5244 .maxlen = sizeof(int),
5245 .mode = 0644,
5246 .proc_handler = proc_dointvec
5247 },
d9333196
BG		 5248 {
5249 .procname = "accept_ra_from_local",
5250 .data = &ipv6_devconf.accept_ra_from_local,
5251 .maxlen = sizeof(int),
5252 .mode = 0644,
5253 .proc_handler = proc_dointvec,
5254 },
1da177e4 5255 {
f8572d8f 5256 /* sentinel */
1da177e4
LT		 5257 }
5258 },
1da177e4
LT		 5259};
5260
bff16c2f 5261static int __addrconf_sysctl_register(struct net *net, char *dev_name,
f8572d8f 5262 struct inet6_dev *idev, struct ipv6_devconf *p)
1da177e4
LT		 5263{
5264 int i;
1da177e4 5265 struct addrconf_sysctl_table *t;
6105e293 5266 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ];
1dab6222 5267
af879cc7 5268 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
1da177e4 5269 if (t == NULL)
f68635e6
PE		 5270 goto out;
5271
bcdd553f 5272 for (i = 0; t->addrconf_vars[i].data; i++) {
e21e8467 5273 t->addrconf_vars[i].data += (char *)p - (char *)&ipv6_devconf;
1da177e4 5274 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
bff16c2f 5275 t->addrconf_vars[i].extra2 = net;
1da177e4 5276 }
1da177e4 5277
6105e293 5278 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name);
1da177e4 5279
6105e293 5280 t->sysctl_header = register_net_sysctl(net, path, t->addrconf_vars);
1da177e4 5281 if (t->sysctl_header == NULL)
6105e293 5282 goto free;
f68635e6
PE		 5283
5284 p->sysctl = t;
95897312 5285 return 0;
1da177e4 5286
f68635e6 5287free:
1da177e4 5288 kfree(t);
f68635e6 5289out:
95897312 5290 return -ENOBUFS;
1da177e4
LT		 5291}
5292
408c4768
PE		 5293static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
5294{
5295 struct addrconf_sysctl_table *t;
5296
5297 if (p->sysctl == NULL)
5298 return;
5299
5300 t = p->sysctl;
5301 p->sysctl = NULL;
ff538818 5302 unregister_net_sysctl_table(t->sysctl_header);
408c4768
PE		 5303 kfree(t);
5304}
5305
a317a2f1 5306static int addrconf_sysctl_register(struct inet6_dev *idev)
f52295a9 5307{
a317a2f1
WC		 5308 int err;
5309
5310 if (!sysctl_dev_name_is_allowed(idev->dev->name))
5311 return -EINVAL;
5312
5313 err = neigh_sysctl_register(idev->dev, idev->nd_parms,
5314 &ndisc_ifinfo_sysctl_change);
5315 if (err)
5316 return err;
5317 err = __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
5318 idev, &idev->cnf);
5319 if (err)
5320 neigh_sysctl_unregister(idev->nd_parms);
5321
5322 return err;
f52295a9
PE		 5323}
5324
408c4768 5325static void addrconf_sysctl_unregister(struct inet6_dev *idev)
1da177e4 5326{
408c4768
PE		 5327 __addrconf_sysctl_unregister(&idev->cnf);
5328 neigh_sysctl_unregister(idev->nd_parms);
1da177e4
LT		 5329}
5330
5331
5332#endif
5333
2c8c1e72 5334static int __net_init addrconf_init_net(struct net *net)
e0da5a48 5335{
a79ca223 5336 int err = -ENOMEM;
e0da5a48
PE		 5337 struct ipv6_devconf *all, *dflt;
5338
a79ca223
HZ		 5339 all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL);
5340 if (all == NULL)
5341 goto err_alloc_all;
e0da5a48 5342
a79ca223
HZ		 5343 dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
5344 if (dflt == NULL)
5345 goto err_alloc_dflt;
e0da5a48 5346
a79ca223
HZ		 5347 /* these will be inherited by all namespaces */
5348 dflt->autoconf = ipv6_defaults.autoconf;
5349 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
e0da5a48
PE		 5350
5351 net->ipv6.devconf_all = all;
5352 net->ipv6.devconf_dflt = dflt;
5353
5354#ifdef CONFIG_SYSCTL
f8572d8f 5355 err = __addrconf_sysctl_register(net, "all", NULL, all);
e0da5a48
PE		 5356 if (err < 0)
5357 goto err_reg_all;
5358
f8572d8f 5359 err = __addrconf_sysctl_register(net, "default", NULL, dflt);
e0da5a48
PE		 5360 if (err < 0)
5361 goto err_reg_dflt;
5362#endif
5363 return 0;
5364
5365#ifdef CONFIG_SYSCTL
5366err_reg_dflt:
5367 __addrconf_sysctl_unregister(all);
5368err_reg_all:
5369 kfree(dflt);
5370#endif
5371err_alloc_dflt:
5372 kfree(all);
5373err_alloc_all:
5374 return err;
5375}
5376
2c8c1e72 5377static void __net_exit addrconf_exit_net(struct net *net)
e0da5a48
PE		 5378{
5379#ifdef CONFIG_SYSCTL
5380 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
5381 __addrconf_sysctl_unregister(net->ipv6.devconf_all);
5382#endif
73cf0e92 5383 kfree(net->ipv6.devconf_dflt);
5384 kfree(net->ipv6.devconf_all);
e0da5a48
PE		 5385}
5386
5387static struct pernet_operations addrconf_ops = {
5388 .init = addrconf_init_net,
5389 .exit = addrconf_exit_net,
5390};
5391
b382b191
TG		 5392static struct rtnl_af_ops inet6_ops = {
5393 .family = AF_INET6,
5394 .fill_link_af = inet6_fill_link_af,
5395 .get_link_af_size = inet6_get_link_af_size,
f53adae4 5396 .set_link_af = inet6_set_link_af,
b382b191
TG		 5397};
5398
1da177e4
LT		 5399/*
5400 * Init / cleanup code
5401 */
5402
5403int __init addrconf_init(void)
5404{
a317a2f1 5405 struct inet6_dev *idev;
c2e21293 5406 int i, err;
2a8cc6c8 5407
e21e8467
SH		 5408 err = ipv6_addr_label_init();
5409 if (err < 0) {
f3213831
JP		 5410 pr_crit("%s: cannot initialize default policy table: %d\n",
5411 __func__, err);
2cc6d2bf 5412 goto out;
2a8cc6c8 5413 }
1da177e4 5414
2cc6d2bf
NH		 5415 err = register_pernet_subsys(&addrconf_ops);
5416 if (err < 0)
5417 goto out_addrlabel;
e0da5a48 5418
c15b1cca
HFS		 5419 addrconf_wq = create_workqueue("ipv6_addrconf");
5420 if (!addrconf_wq) {
5421 err = -ENOMEM;
5422 goto out_nowq;
5423 }
5424
1da177e4
LT		 5425 /* The addrconf netdev notifier requires that loopback_dev
5426 * has it's ipv6 private information allocated and setup
5427 * before it can bring up and give link-local addresses
5428 * to other devices which are up.
5429 *
5430 * Unfortunately, loopback_dev is not necessarily the first
5431 * entry in the global dev_base list of net devices. In fact,
5432 * it is likely to be the very last entry on that list.
5433 * So this causes the notifier registry below to try and
5434 * give link-local addresses to all devices besides loopback_dev
5435 * first, then loopback_dev, which cases all the non-loopback_dev
5436 * devices to fail to get a link-local address.
5437 *
5438 * So, as a temporary fix, allocate the ipv6 structure for
5439 * loopback_dev first by hand.
5440 * Longer term, all of the dependencies ipv6 has upon the loopback
5441 * device and it being up should be removed.
5442 */
5443 rtnl_lock();
a317a2f1 5444 idev = ipv6_add_dev(init_net.loopback_dev);
1da177e4 5445 rtnl_unlock();
a317a2f1
WC		 5446 if (IS_ERR(idev)) {
5447 err = PTR_ERR(idev);
e0da5a48 5448 goto errlo;
a317a2f1 5449 }
1da177e4 5450
c2e21293 5451 for (i = 0; i < IN6_ADDR_HSIZE; i++)
5452 INIT_HLIST_HEAD(&inet6_addr_lst[i]);
5453
1da177e4
LT		 5454 register_netdevice_notifier(&ipv6_dev_notf);
5455
c15b1cca 5456 addrconf_verify();
c127ea2c 5457
3678a9d8 5458 rtnl_af_register(&inet6_ops);
b382b191 5459
c7ac8679
GR		 5460 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo,
5461 NULL);
c127ea2c
TG		 5462 if (err < 0)
5463 goto errout;
5464
5465 /* Only the first call to __rtnl_register can fail */
c7ac8679
GR		 5466 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL, NULL);
5467 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL, NULL);
5468 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr,
5469 inet6_dump_ifaddr, NULL);
5470 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL,
5471 inet6_dump_ifmcaddr, NULL);
5472 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL,
5473 inet6_dump_ifacaddr, NULL);
76f8f6cb 5474 __rtnl_register(PF_INET6, RTM_GETNETCONF, inet6_netconf_get_devconf,
7a674200 5475 inet6_netconf_dump_devconf, NULL);
c127ea2c 5476
2a8cc6c8
YH		 5477 ipv6_addr_label_rtnl_register();
5478
1da177e4 5479 return 0;
c127ea2c 5480errout:
b382b191 5481 rtnl_af_unregister(&inet6_ops);
c127ea2c 5482 unregister_netdevice_notifier(&ipv6_dev_notf);
e0da5a48 5483errlo:
c15b1cca
HFS		 5484 destroy_workqueue(addrconf_wq);
5485out_nowq:
e0da5a48 5486 unregister_pernet_subsys(&addrconf_ops);
2cc6d2bf
NH		 5487out_addrlabel:
5488 ipv6_addr_label_cleanup();
5489out:
c127ea2c 5490 return err;
1da177e4
LT		 5491}
5492
09f7709f 5493void addrconf_cleanup(void)
1da177e4 5494{
176c39af 5495 struct net_device *dev;
1da177e4
LT		 5496 int i;
5497
5498 unregister_netdevice_notifier(&ipv6_dev_notf);
e0da5a48 5499 unregister_pernet_subsys(&addrconf_ops);
2cc6d2bf 5500 ipv6_addr_label_cleanup();
1da177e4
LT		 5501
5502 rtnl_lock();
5503
b382b191
TG		 5504 __rtnl_af_unregister(&inet6_ops);
5505
176c39af
DL		 5506 /* clean dev list */
5507 for_each_netdev(&init_net, dev) {
5508 if (__in6_dev_get(dev) == NULL)
5509 continue;
5510 addrconf_ifdown(dev, 1);
5511 }
5512 addrconf_ifdown(init_net.loopback_dev, 2);
5513
1da177e4
LT		 5514 /*
5515 * Check hash table.
5516 */
5c578aed 5517 spin_lock_bh(&addrconf_hash_lock);
c2e21293 5518 for (i = 0; i < IN6_ADDR_HSIZE; i++)
5519 WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
5c578aed 5520 spin_unlock_bh(&addrconf_hash_lock);
c15b1cca 5521 cancel_delayed_work(&addr_chk_work);
1da177e4 5522 rtnl_unlock();
c15b1cca
HFS		 5523
5524 destroy_workqueue(addrconf_wq);
1da177e4 5525}
Linux 6.x block layer and io_uring tree(s)