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net: ipv6: Add sysctl entry to disable MTU updates from RA
[mirror_ubuntu-artful-kernel.git] / net / ipv6 / addrconf.c
CommitLineData
1da177e4
LT		 1/*
2 * IPv6 Address [auto]configuration
3 * Linux INET6 implementation
4 *
5 * Authors:
1ab1457c 6 * Pedro Roque <roque@di.fc.ul.pt>
1da177e4
LT		 7 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
8 *
1da177e4
LT		 9 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License
11 * as published by the Free Software Foundation; either version
12 * 2 of the License, or (at your option) any later version.
13 */
14
15/*
16 * Changes:
17 *
18 * Janos Farkas : delete timer on ifdown
19 * <chexum@bankinf.banki.hu>
20 * Andi Kleen : kill double kfree on module
21 * unload.
22 * Maciej W. Rozycki : FDDI support
23 * sekiya@USAGI : Don't send too many RS
24 * packets.
25 * yoshfuji@USAGI : Fixed interval between DAD
26 * packets.
27 * YOSHIFUJI Hideaki @USAGI : improved accuracy of
28 * address validation timer.
29 * YOSHIFUJI Hideaki @USAGI : Privacy Extensions (RFC3041)
30 * support.
31 * Yuji SEKIYA @USAGI : Don't assign a same IPv6
32 * address on a same interface.
33 * YOSHIFUJI Hideaki @USAGI : ARCnet support
34 * YOSHIFUJI Hideaki @USAGI : convert /proc/net/if_inet6 to
35 * seq_file.
b1cacb68
YH		 36 * YOSHIFUJI Hideaki @USAGI : improved source address
37 * selection; consider scope,
38 * status etc.
1da177e4
LT		 39 */
40
f3213831
JP		 41#define pr_fmt(fmt) "IPv6: " fmt
42
1da177e4
LT		 43#include <linux/errno.h>
44#include <linux/types.h>
a0bffffc 45#include <linux/kernel.h>
1da177e4
LT		 46#include <linux/socket.h>
47#include <linux/sockios.h>
1da177e4
LT		 48#include <linux/net.h>
49#include <linux/in6.h>
50#include <linux/netdevice.h>
1823730f 51#include <linux/if_addr.h>
1da177e4
LT		 52#include <linux/if_arp.h>
53#include <linux/if_arcnet.h>
54#include <linux/if_infiniband.h>
55#include <linux/route.h>
56#include <linux/inetdevice.h>
57#include <linux/init.h>
5a0e3ad6 58#include <linux/slab.h>
1da177e4
LT		 59#ifdef CONFIG_SYSCTL
60#include <linux/sysctl.h>
61#endif
4fc268d2 62#include <linux/capability.h>
1da177e4
LT		 63#include <linux/delay.h>
64#include <linux/notifier.h>
543537bd 65#include <linux/string.h>
ddbe5032 66#include <linux/hash.h>
1da177e4 67
457c4cbc 68#include <net/net_namespace.h>
1da177e4
LT		 69#include <net/sock.h>
70#include <net/snmp.h>
71
06a4c1c5 72#include <net/af_ieee802154.h>
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,
c2943f14 204 .accept_ra_mtu = 1,
1da177e4
LT		 205};
206
ab32ea5d 207static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
1da177e4
LT		 208 .forwarding = 0,
209 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
210 .mtu6 = IPV6_MIN_MTU,
211 .accept_ra = 1,
212 .accept_redirects = 1,
213 .autoconf = 1,
fc4eba58
HFS		 214 .force_mld_version = 0,
215 .mldv1_unsolicited_report_interval = 10 * HZ,
216 .mldv2_unsolicited_report_interval = HZ,
1da177e4
LT		 217 .dad_transmits = 1,
218 .rtr_solicits = MAX_RTR_SOLICITATIONS,
219 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
220 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
1da177e4
LT		 221 .use_tempaddr = 0,
222 .temp_valid_lft = TEMP_VALID_LIFETIME,
223 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
224 .regen_max_retry = REGEN_MAX_RETRY,
225 .max_desync_factor = MAX_DESYNC_FACTOR,
1da177e4 226 .max_addresses = IPV6_MAX_ADDRESSES,
65f5c7c1 227 .accept_ra_defrtr = 1,
d9333196 228 .accept_ra_from_local = 0,
c4fd30eb 229 .accept_ra_pinfo = 1,
930d6ff2
YH		 230#ifdef CONFIG_IPV6_ROUTER_PREF
231 .accept_ra_rtr_pref = 1,
52e16356 232 .rtr_probe_interval = 60 * HZ,
09c884d4
YH		 233#ifdef CONFIG_IPV6_ROUTE_INFO
234 .accept_ra_rt_info_max_plen = 0,
235#endif
930d6ff2 236#endif
fbea49e1 237 .proxy_ndp = 0,
0bcbc926 238 .accept_source_route = 0, /* we do not accept RH0 by default. */
778d80be 239 .disable_ipv6 = 0,
1b34be74 240 .accept_dad = 1,
b800c3b9 241 .suppress_frag_ndisc = 1,
c2943f14 242 .accept_ra_mtu = 1,
1da177e4
LT		 243};
244
f24e3d65 245/* Check if a valid qdisc is available */
05297949 246static inline bool addrconf_qdisc_ok(const struct net_device *dev)
f24e3d65 247{
05297949 248 return !qdisc_tx_is_noop(dev);
f24e3d65
MC		 249}
250
b7b1bfce 251static void addrconf_del_rs_timer(struct inet6_dev *idev)
1da177e4 252{
b7b1bfce
HFS		 253 if (del_timer(&idev->rs_timer))
254 __in6_dev_put(idev);
255}
256
c15b1cca 257static void addrconf_del_dad_work(struct inet6_ifaddr *ifp)
b7b1bfce 258{
c15b1cca 259 if (cancel_delayed_work(&ifp->dad_work))
1da177e4
LT		 260 __in6_ifa_put(ifp);
261}
262
b7b1bfce
HFS		 263static void addrconf_mod_rs_timer(struct inet6_dev *idev,
264 unsigned long when)
265{
266 if (!timer_pending(&idev->rs_timer))
267 in6_dev_hold(idev);
268 mod_timer(&idev->rs_timer, jiffies + when);
269}
1da177e4 270
c15b1cca
HFS		 271static void addrconf_mod_dad_work(struct inet6_ifaddr *ifp,
272 unsigned long delay)
1da177e4 273{
c15b1cca 274 if (!delayed_work_pending(&ifp->dad_work))
1da177e4 275 in6_ifa_hold(ifp);
c15b1cca 276 mod_delayed_work(addrconf_wq, &ifp->dad_work, delay);
1da177e4
LT		 277}
278
7f7d9a6b
HX		 279static int snmp6_alloc_dev(struct inet6_dev *idev)
280{
827da44c
JS		 281 int i;
282
698365fa
WC		 283 idev->stats.ipv6 = alloc_percpu(struct ipstats_mib);
284 if (!idev->stats.ipv6)
7f7d9a6b 285 goto err_ip;
827da44c
JS		 286
287 for_each_possible_cpu(i) {
288 struct ipstats_mib *addrconf_stats;
698365fa 289 addrconf_stats = per_cpu_ptr(idev->stats.ipv6, i);
827da44c 290 u64_stats_init(&addrconf_stats->syncp);
827da44c
JS		 291 }
292
293
be281e55
ED		 294 idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device),
295 GFP_KERNEL);
296 if (!idev->stats.icmpv6dev)
7f7d9a6b 297 goto err_icmp;
be281e55
ED		 298 idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device),
299 GFP_KERNEL);
300 if (!idev->stats.icmpv6msgdev)
14878f75 301 goto err_icmpmsg;
7f7d9a6b
HX		 302
303 return 0;
304
14878f75 305err_icmpmsg:
be281e55 306 kfree(idev->stats.icmpv6dev);
7f7d9a6b 307err_icmp:
698365fa 308 free_percpu(idev->stats.ipv6);
7f7d9a6b 309err_ip:
aaf70ec7 310 return -ENOMEM;
7f7d9a6b
HX		 311}
312
8e5e8f30 313static struct inet6_dev *ipv6_add_dev(struct net_device *dev)
1da177e4
LT		 314{
315 struct inet6_dev *ndev;
a317a2f1 316 int err = -ENOMEM;
1da177e4
LT		 317
318 ASSERT_RTNL();
319
320 if (dev->mtu < IPV6_MIN_MTU)
a317a2f1 321 return ERR_PTR(-EINVAL);
1da177e4 322
1ab1457c 323 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
1ab1457c 324 if (ndev == NULL)
a317a2f1 325 return ERR_PTR(err);
322f74a4
IO		 326
327 rwlock_init(&ndev->lock);
328 ndev->dev = dev;
502a2ffd 329 INIT_LIST_HEAD(&ndev->addr_list);
b7b1bfce
HFS		 330 setup_timer(&ndev->rs_timer, addrconf_rs_timer,
331 (unsigned long)ndev);
c346dca1 332 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf));
322f74a4
IO		 333 ndev->cnf.mtu6 = dev->mtu;
334 ndev->cnf.sysctl = NULL;
335 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
336 if (ndev->nd_parms == NULL) {
337 kfree(ndev);
a317a2f1 338 return ERR_PTR(err);
322f74a4 339 }
0187bdfb
BH		 340 if (ndev->cnf.forwarding)
341 dev_disable_lro(dev);
322f74a4
IO		 342 /* We refer to the device */
343 dev_hold(dev);
1da177e4 344
322f74a4 345 if (snmp6_alloc_dev(ndev) < 0) {
ba3542e1 346 ADBG(KERN_WARNING
f3213831 347 "%s: cannot allocate memory for statistics; dev=%s.\n",
ba3542e1 348 __func__, dev->name);
322f74a4 349 neigh_parms_release(&nd_tbl, ndev->nd_parms);
8603e33d
RL		 350 dev_put(dev);
351 kfree(ndev);
a317a2f1 352 return ERR_PTR(err);
322f74a4 353 }
1da177e4 354
322f74a4 355 if (snmp6_register_dev(ndev) < 0) {
ba3542e1 356 ADBG(KERN_WARNING
f3213831 357 "%s: cannot create /proc/net/dev_snmp6/%s\n",
ba3542e1 358 __func__, dev->name);
a317a2f1 359 goto err_release;
322f74a4
IO		 360 }
361
362 /* One reference from device. We must do this before
363 * we invoke __ipv6_regen_rndid().
364 */
365 in6_dev_hold(ndev);
1da177e4 366
1b34be74
YH		 367 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
368 ndev->cnf.accept_dad = -1;
369
07a93626 370#if IS_ENABLED(CONFIG_IPV6_SIT)
b077d7ab 371 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
f3213831 372 pr_info("%s: Disabled Multicast RS\n", dev->name);
b077d7ab
YH		 373 ndev->cnf.rtr_solicits = 0;
374 }
375#endif
376
372e6c8f 377 INIT_LIST_HEAD(&ndev->tempaddr_list);
b24b8a24 378 setup_timer(&ndev->regen_timer, ipv6_regen_rndid, (unsigned long)ndev);
322f74a4
IO		 379 if ((dev->flags&IFF_LOOPBACK) ||
380 dev->type == ARPHRD_TUNNEL ||
9625ed72 381 dev->type == ARPHRD_TUNNEL6 ||
0be669bb 382 dev->type == ARPHRD_SIT ||
0be669bb 383 dev->type == ARPHRD_NONE) {
322f74a4
IO		 384 ndev->cnf.use_tempaddr = -1;
385 } else {
386 in6_dev_hold(ndev);
387 ipv6_regen_rndid((unsigned long) ndev);
388 }
5d9efa7e 389
914faa14 390 ndev->token = in6addr_any;
1da177e4 391
f24e3d65 392 if (netif_running(dev) && addrconf_qdisc_ok(dev))
53aadcc9
HX		 393 ndev->if_flags |= IF_READY;
394
322f74a4
IO		 395 ipv6_mc_init_dev(ndev);
396 ndev->tstamp = jiffies;
a317a2f1
WC		 397 err = addrconf_sysctl_register(ndev);
398 if (err) {
399 ipv6_mc_destroy_dev(ndev);
400 del_timer(&ndev->regen_timer);
401 goto err_release;
402 }
30c4cf57 403 /* protected by rtnl_lock */
cf778b00 404 rcu_assign_pointer(dev->ip6_ptr, ndev);
d88ae4cc 405
2c5e8933
HFS		 406 /* Join interface-local all-node multicast group */
407 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allnodes);
408
d88ae4cc 409 /* Join all-node multicast group */
f3ee4010 410 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);
d88ae4cc 411
d6ddef9e 412 /* Join all-router multicast group if forwarding is set */
8b2aaede 413 if (ndev->cnf.forwarding && (dev->flags & IFF_MULTICAST))
d6ddef9e
LW		 414 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
415
1da177e4 416 return ndev;
a317a2f1
WC		 417
418err_release:
419 neigh_parms_release(&nd_tbl, ndev->nd_parms);
420 ndev->dead = 1;
421 in6_dev_finish_destroy(ndev);
422 return ERR_PTR(err);
1da177e4
LT		 423}
424
8e5e8f30 425static struct inet6_dev *ipv6_find_idev(struct net_device *dev)
1da177e4
LT		 426{
427 struct inet6_dev *idev;
428
429 ASSERT_RTNL();
430
e21e8467
SH		 431 idev = __in6_dev_get(dev);
432 if (!idev) {
433 idev = ipv6_add_dev(dev);
a317a2f1 434 if (IS_ERR(idev))
1da177e4
LT		 435 return NULL;
436 }
c5e33bdd 437
1da177e4
LT		 438 if (dev->flags&IFF_UP)
439 ipv6_mc_up(idev);
440 return idev;
441}
442
f3a1bfb1
ND		 443static int inet6_netconf_msgsize_devconf(int type)
444{
445 int size = NLMSG_ALIGN(sizeof(struct netconfmsg))
446 + nla_total_size(4); /* NETCONFA_IFINDEX */
447
76f8f6cb
ND		 448 /* type -1 is used for ALL */
449 if (type == -1 || type == NETCONFA_FORWARDING)
f3a1bfb1 450 size += nla_total_size(4);
b1afce95 451#ifdef CONFIG_IPV6_MROUTE
d67b8c61
ND		 452 if (type == -1 || type == NETCONFA_MC_FORWARDING)
453 size += nla_total_size(4);
b1afce95 454#endif
c92d5491 455 if (type == -1 || type == NETCONFA_PROXY_NEIGH)
456 size += nla_total_size(4);
f3a1bfb1
ND		 457
458 return size;
459}
460
461static int inet6_netconf_fill_devconf(struct sk_buff *skb, int ifindex,
462 struct ipv6_devconf *devconf, u32 portid,
463 u32 seq, int event, unsigned int flags,
464 int type)
465{
466 struct nlmsghdr *nlh;
467 struct netconfmsg *ncm;
468
469 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg),
470 flags);
471 if (nlh == NULL)
472 return -EMSGSIZE;
473
474 ncm = nlmsg_data(nlh);
475 ncm->ncm_family = AF_INET6;
476
477 if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0)
478 goto nla_put_failure;
479
76f8f6cb
ND		 480 /* type -1 is used for ALL */
481 if ((type == -1 || type == NETCONFA_FORWARDING) &&
f3a1bfb1
ND		 482 nla_put_s32(skb, NETCONFA_FORWARDING, devconf->forwarding) < 0)
483 goto nla_put_failure;
b1afce95 484#ifdef CONFIG_IPV6_MROUTE
d67b8c61
ND		 485 if ((type == -1 || type == NETCONFA_MC_FORWARDING) &&
486 nla_put_s32(skb, NETCONFA_MC_FORWARDING,
487 devconf->mc_forwarding) < 0)
488 goto nla_put_failure;
b1afce95 489#endif
c92d5491 490 if ((type == -1 || type == NETCONFA_PROXY_NEIGH) &&
491 nla_put_s32(skb, NETCONFA_PROXY_NEIGH, devconf->proxy_ndp) < 0)
492 goto nla_put_failure;
493
053c095a
JB		 494 nlmsg_end(skb, nlh);
495 return 0;
f3a1bfb1
ND		 496
497nla_put_failure:
498 nlmsg_cancel(skb, nlh);
499 return -EMSGSIZE;
500}
501
d67b8c61
ND		 502void inet6_netconf_notify_devconf(struct net *net, int type, int ifindex,
503 struct ipv6_devconf *devconf)
f3a1bfb1
ND		 504{
505 struct sk_buff *skb;
506 int err = -ENOBUFS;
507
508 skb = nlmsg_new(inet6_netconf_msgsize_devconf(type), GFP_ATOMIC);
509 if (skb == NULL)
510 goto errout;
511
512 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 0, 0,
513 RTM_NEWNETCONF, 0, type);
514 if (err < 0) {
515 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
516 WARN_ON(err == -EMSGSIZE);
517 kfree_skb(skb);
518 goto errout;
519 }
520 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_NETCONF, NULL, GFP_ATOMIC);
521 return;
522errout:
bd779028 523 rtnl_set_sk_err(net, RTNLGRP_IPV6_NETCONF, err);
f3a1bfb1
ND		 524}
525
76f8f6cb
ND		 526static const struct nla_policy devconf_ipv6_policy[NETCONFA_MAX+1] = {
527 [NETCONFA_IFINDEX] = { .len = sizeof(int) },
528 [NETCONFA_FORWARDING] = { .len = sizeof(int) },
c92d5491 529 [NETCONFA_PROXY_NEIGH] = { .len = sizeof(int) },
76f8f6cb
ND		 530};
531
532static int inet6_netconf_get_devconf(struct sk_buff *in_skb,
661d2967 533 struct nlmsghdr *nlh)
76f8f6cb
ND		 534{
535 struct net *net = sock_net(in_skb->sk);
536 struct nlattr *tb[NETCONFA_MAX+1];
537 struct netconfmsg *ncm;
538 struct sk_buff *skb;
539 struct ipv6_devconf *devconf;
540 struct inet6_dev *in6_dev;
541 struct net_device *dev;
542 int ifindex;
543 int err;
544
545 err = nlmsg_parse(nlh, sizeof(*ncm), tb, NETCONFA_MAX,
546 devconf_ipv6_policy);
547 if (err < 0)
548 goto errout;
549
550 err = EINVAL;
551 if (!tb[NETCONFA_IFINDEX])
552 goto errout;
553
554 ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]);
555 switch (ifindex) {
556 case NETCONFA_IFINDEX_ALL:
557 devconf = net->ipv6.devconf_all;
558 break;
559 case NETCONFA_IFINDEX_DEFAULT:
560 devconf = net->ipv6.devconf_dflt;
561 break;
562 default:
563 dev = __dev_get_by_index(net, ifindex);
564 if (dev == NULL)
565 goto errout;
566 in6_dev = __in6_dev_get(dev);
567 if (in6_dev == NULL)
568 goto errout;
569 devconf = &in6_dev->cnf;
570 break;
571 }
572
573 err = -ENOBUFS;
574 skb = nlmsg_new(inet6_netconf_msgsize_devconf(-1), GFP_ATOMIC);
575 if (skb == NULL)
576 goto errout;
577
578 err = inet6_netconf_fill_devconf(skb, ifindex, devconf,
579 NETLINK_CB(in_skb).portid,
580 nlh->nlmsg_seq, RTM_NEWNETCONF, 0,
581 -1);
582 if (err < 0) {
583 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
584 WARN_ON(err == -EMSGSIZE);
585 kfree_skb(skb);
586 goto errout;
587 }
588 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
589errout:
590 return err;
591}
592
7a674200
ND		 593static int inet6_netconf_dump_devconf(struct sk_buff *skb,
594 struct netlink_callback *cb)
595{
596 struct net *net = sock_net(skb->sk);
597 int h, s_h;
598 int idx, s_idx;
599 struct net_device *dev;
600 struct inet6_dev *idev;
601 struct hlist_head *head;
602
603 s_h = cb->args[0];
604 s_idx = idx = cb->args[1];
605
606 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
607 idx = 0;
608 head = &net->dev_index_head[h];
609 rcu_read_lock();
63998ac2
ND		 610 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^
611 net->dev_base_seq;
7a674200
ND		 612 hlist_for_each_entry_rcu(dev, head, index_hlist) {
613 if (idx < s_idx)
614 goto cont;
615 idev = __in6_dev_get(dev);
616 if (!idev)
617 goto cont;
618
619 if (inet6_netconf_fill_devconf(skb, dev->ifindex,
620 &idev->cnf,
621 NETLINK_CB(cb->skb).portid,
622 cb->nlh->nlmsg_seq,
623 RTM_NEWNETCONF,
624 NLM_F_MULTI,
053c095a 625 -1) < 0) {
7a674200
ND		 626 rcu_read_unlock();
627 goto done;
628 }
63998ac2 629 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
7a674200
ND		 630cont:
631 idx++;
632 }
633 rcu_read_unlock();
634 }
635 if (h == NETDEV_HASHENTRIES) {
636 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL,
637 net->ipv6.devconf_all,
638 NETLINK_CB(cb->skb).portid,
639 cb->nlh->nlmsg_seq,
640 RTM_NEWNETCONF, NLM_F_MULTI,
053c095a 641 -1) < 0)
7a674200
ND		 642 goto done;
643 else
644 h++;
645 }
646 if (h == NETDEV_HASHENTRIES + 1) {
647 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT,
648 net->ipv6.devconf_dflt,
649 NETLINK_CB(cb->skb).portid,
650 cb->nlh->nlmsg_seq,
651 RTM_NEWNETCONF, NLM_F_MULTI,
053c095a 652 -1) < 0)
7a674200
ND		 653 goto done;
654 else
655 h++;
656 }
657done:
658 cb->args[0] = h;
659 cb->args[1] = idx;
660
661 return skb->len;
662}
663
1da177e4
LT		 664#ifdef CONFIG_SYSCTL
665static void dev_forward_change(struct inet6_dev *idev)
666{
667 struct net_device *dev;
668 struct inet6_ifaddr *ifa;
1da177e4
LT		 669
670 if (!idev)
671 return;
672 dev = idev->dev;
0187bdfb
BH		 673 if (idev->cnf.forwarding)
674 dev_disable_lro(dev);
1a940835 675 if (dev->flags & IFF_MULTICAST) {
2c5e8933 676 if (idev->cnf.forwarding) {
f3ee4010 677 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
2c5e8933
HFS		 678 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allrouters);
679 ipv6_dev_mc_inc(dev, &in6addr_sitelocal_allrouters);
680 } else {
f3ee4010 681 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
2c5e8933
HFS		 682 ipv6_dev_mc_dec(dev, &in6addr_interfacelocal_allrouters);
683 ipv6_dev_mc_dec(dev, &in6addr_sitelocal_allrouters);
684 }
1da177e4 685 }
502a2ffd 686
687 list_for_each_entry(ifa, &idev->addr_list, if_list) {
2c12a74c
MW		 688 if (ifa->flags&IFA_F_TENTATIVE)
689 continue;
1da177e4
LT		 690 if (idev->cnf.forwarding)
691 addrconf_join_anycast(ifa);
692 else
693 addrconf_leave_anycast(ifa);
694 }
f3a1bfb1
ND		 695 inet6_netconf_notify_devconf(dev_net(dev), NETCONFA_FORWARDING,
696 dev->ifindex, &idev->cnf);
1da177e4
LT		 697}
698
699
e186932b 700static void addrconf_forward_change(struct net *net, __s32 newf)
1da177e4
LT		 701{
702 struct net_device *dev;
703 struct inet6_dev *idev;
704
4acd4945 705 for_each_netdev(net, dev) {
1da177e4
LT		 706 idev = __in6_dev_get(dev);
707 if (idev) {
e186932b
PE		 708 int changed = (!idev->cnf.forwarding) ^ (!newf);
709 idev->cnf.forwarding = newf;
1da177e4
LT		 710 if (changed)
711 dev_forward_change(idev);
712 }
1da177e4 713 }
1da177e4 714}
c8fecf22 715
013d97e9 716static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf)
c8fecf22 717{
bff16c2f 718 struct net *net;
013d97e9
FR		 719 int old;
720
721 if (!rtnl_trylock())
722 return restart_syscall();
bff16c2f
PE		 723
724 net = (struct net *)table->extra2;
013d97e9
FR		 725 old = *p;
726 *p = newf;
b325fddb 727
013d97e9 728 if (p == &net->ipv6.devconf_dflt->forwarding) {
f3a1bfb1
ND		 729 if ((!newf) ^ (!old))
730 inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING,
731 NETCONFA_IFINDEX_DEFAULT,
732 net->ipv6.devconf_dflt);
013d97e9
FR		 733 rtnl_unlock();
734 return 0;
88af182e 735 }
c8fecf22 736
e186932b 737 if (p == &net->ipv6.devconf_all->forwarding) {
e186932b
PE		 738 net->ipv6.devconf_dflt->forwarding = newf;
739 addrconf_forward_change(net, newf);
f3a1bfb1
ND		 740 if ((!newf) ^ (!old))
741 inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING,
742 NETCONFA_IFINDEX_ALL,
743 net->ipv6.devconf_all);
013d97e9 744 } else if ((!newf) ^ (!old))
c8fecf22 745 dev_forward_change((struct inet6_dev *)table->extra1);
0187bdfb 746 rtnl_unlock();
c8fecf22 747
013d97e9 748 if (newf)
7b4da532 749 rt6_purge_dflt_routers(net);
b325fddb 750 return 1;
c8fecf22 751}
1da177e4
LT		 752#endif
753
5c578aed 754/* Nobody refers to this ifaddr, destroy it */
1da177e4
LT		 755void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
756{
c2e21293 757 WARN_ON(!hlist_unhashed(&ifp->addr_lst));
547b792c 758
1da177e4 759#ifdef NET_REFCNT_DEBUG
91df42be 760 pr_debug("%s\n", __func__);
1da177e4
LT		 761#endif
762
763 in6_dev_put(ifp->idev);
764
c15b1cca
HFS		 765 if (cancel_delayed_work(&ifp->dad_work))
766 pr_notice("delayed DAD work was pending while freeing ifa=%p\n",
767 ifp);
1da177e4 768
e9d3e084 769 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
f3213831 770 pr_warn("Freeing alive inet6 address %p\n", ifp);
1da177e4
LT		 771 return;
772 }
94e187c0 773 ip6_rt_put(ifp->rt);
1da177e4 774
e5785985 775 kfree_rcu(ifp, rcu);
1da177e4
LT		 776}
777
e55ffac6
BH		 778static void
779ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
780{
502a2ffd 781 struct list_head *p;
8a6ce0c0 782 int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
e55ffac6
BH		 783
784 /*
785 * Each device address list is sorted in order of scope -
786 * global before linklocal.
787 */
502a2ffd 788 list_for_each(p, &idev->addr_list) {
789 struct inet6_ifaddr *ifa
790 = list_entry(p, struct inet6_ifaddr, if_list);
8a6ce0c0 791 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
e55ffac6
BH		 792 break;
793 }
794
b54c9b98 795 list_add_tail(&ifp->if_list, p);
e55ffac6
BH		 796}
797
ddbe5032 798static u32 inet6_addr_hash(const struct in6_addr *addr)
3eb84f49 799{
ddbe5032 800 return hash_32(ipv6_addr_hash(addr), IN6_ADDR_HSIZE_SHIFT);
3eb84f49
YH		 801}
802
1da177e4
LT		 803/* On success it returns ifp with increased reference count */
804
805static struct inet6_ifaddr *
3f8f5298
JP		 806ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
807 const struct in6_addr *peer_addr, int pfxlen,
8a226b2c 808 int scope, u32 flags, u32 valid_lft, u32 prefered_lft)
1da177e4
LT		 809{
810 struct inet6_ifaddr *ifa = NULL;
811 struct rt6_info *rt;
3a88a81d 812 unsigned int hash;
1da177e4 813 int err = 0;
d68b8270
YH		 814 int addr_type = ipv6_addr_type(addr);
815
816 if (addr_type == IPV6_ADDR_ANY ||
817 addr_type & IPV6_ADDR_MULTICAST ||
818 (!(idev->dev->flags & IFF_LOOPBACK) &&
819 addr_type & IPV6_ADDR_LOOPBACK))
820 return ERR_PTR(-EADDRNOTAVAIL);
1da177e4 821
8814c4b5 822 rcu_read_lock_bh();
1da177e4
LT		 823 if (idev->dead) {
824 err = -ENODEV; /*XXX*/
825 goto out2;
826 }
827
56d417b1 828 if (idev->cnf.disable_ipv6) {
9bdd8d40
BH		 829 err = -EACCES;
830 goto out2;
831 }
832
5c578aed 833 spin_lock(&addrconf_hash_lock);
1da177e4
LT		 834
835 /* Ignore adding duplicate addresses on an interface */
c346dca1 836 if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) {
ba3542e1 837 ADBG("ipv6_add_addr: already assigned\n");
1da177e4
LT		 838 err = -EEXIST;
839 goto out;
840 }
841
322f74a4 842 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
1da177e4
LT		 843
844 if (ifa == NULL) {
ba3542e1 845 ADBG("ipv6_add_addr: malloc failed\n");
1da177e4
LT		 846 err = -ENOBUFS;
847 goto out;
848 }
849
8f031519 850 rt = addrconf_dst_alloc(idev, addr, false);
1da177e4
LT		 851 if (IS_ERR(rt)) {
852 err = PTR_ERR(rt);
853 goto out;
854 }
855
bba24896
JP		 856 neigh_parms_data_state_setall(idev->nd_parms);
857
4e3fd7a0 858 ifa->addr = *addr;
3f8f5298
JP		 859 if (peer_addr)
860 ifa->peer_addr = *peer_addr;
1da177e4
LT		 861
862 spin_lock_init(&ifa->lock);
e9d3e084 863 spin_lock_init(&ifa->state_lock);
c15b1cca 864 INIT_DELAYED_WORK(&ifa->dad_work, addrconf_dad_work);
c2e21293 865 INIT_HLIST_NODE(&ifa->addr_lst);
1da177e4
LT		 866 ifa->scope = scope;
867 ifa->prefix_len = pfxlen;
868 ifa->flags = flags | IFA_F_TENTATIVE;
8a226b2c
JB		 869 ifa->valid_lft = valid_lft;
870 ifa->prefered_lft = prefered_lft;
1da177e4 871 ifa->cstamp = ifa->tstamp = jiffies;
617fe29d 872 ifa->tokenized = false;
1da177e4 873
57f5f544
KF		 874 ifa->rt = rt;
875
1da177e4
LT		 876 ifa->idev = idev;
877 in6_dev_hold(idev);
878 /* For caller */
879 in6_ifa_hold(ifa);
880
881 /* Add to big hash table */
ddbe5032 882 hash = inet6_addr_hash(addr);
1da177e4 883
5c578aed 884 hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]);
5c578aed 885 spin_unlock(&addrconf_hash_lock);
1da177e4
LT		 886
887 write_lock(&idev->lock);
888 /* Add to inet6_dev unicast addr list. */
e55ffac6 889 ipv6_link_dev_addr(idev, ifa);
1da177e4 890
1da177e4 891 if (ifa->flags&IFA_F_TEMPORARY) {
372e6c8f 892 list_add(&ifa->tmp_list, &idev->tempaddr_list);
1da177e4
LT		 893 in6_ifa_hold(ifa);
894 }
1da177e4 895
1da177e4
LT		 896 in6_ifa_hold(ifa);
897 write_unlock(&idev->lock);
898out2:
8814c4b5 899 rcu_read_unlock_bh();
1da177e4 900
fd92833a 901 if (likely(err == 0))
f88c91dd 902 inet6addr_notifier_call_chain(NETDEV_UP, ifa);
1da177e4
LT		 903 else {
904 kfree(ifa);
905 ifa = ERR_PTR(err);
906 }
907
908 return ifa;
909out:
5c578aed 910 spin_unlock(&addrconf_hash_lock);
1da177e4
LT		 911 goto out2;
912}
913
5b84efec
TH		 914enum cleanup_prefix_rt_t {
915 CLEANUP_PREFIX_RT_NOP, /* no cleanup action for prefix route */
916 CLEANUP_PREFIX_RT_DEL, /* delete the prefix route */
917 CLEANUP_PREFIX_RT_EXPIRE, /* update the lifetime of the prefix route */
918};
919
920/*
921 * Check, whether the prefix for ifp would still need a prefix route
922 * after deleting ifp. The function returns one of the CLEANUP_PREFIX_RT_*
923 * constants.
924 *
925 * 1) we don't purge prefix if address was not permanent.
926 * prefix is managed by its own lifetime.
927 * 2) we also don't purge, if the address was IFA_F_NOPREFIXROUTE.
928 * 3) if there are no addresses, delete prefix.
929 * 4) if there are still other permanent address(es),
930 * corresponding prefix is still permanent.
931 * 5) if there are still other addresses with IFA_F_NOPREFIXROUTE,
932 * don't purge the prefix, assume user space is managing it.
933 * 6) otherwise, update prefix lifetime to the
934 * longest valid lifetime among the corresponding
935 * addresses on the device.
936 * Note: subsequent RA will update lifetime.
937 **/
938static enum cleanup_prefix_rt_t
939check_cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long *expires)
940{
941 struct inet6_ifaddr *ifa;
942 struct inet6_dev *idev = ifp->idev;
943 unsigned long lifetime;
944 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_DEL;
945
946 *expires = jiffies;
947
948 list_for_each_entry(ifa, &idev->addr_list, if_list) {
949 if (ifa == ifp)
950 continue;
951 if (!ipv6_prefix_equal(&ifa->addr, &ifp->addr,
952 ifp->prefix_len))
953 continue;
954 if (ifa->flags & (IFA_F_PERMANENT | IFA_F_NOPREFIXROUTE))
955 return CLEANUP_PREFIX_RT_NOP;
956
957 action = CLEANUP_PREFIX_RT_EXPIRE;
958
959 spin_lock(&ifa->lock);
960
961 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
962 /*
963 * Note: Because this address is
964 * not permanent, lifetime <
965 * LONG_MAX / HZ here.
966 */
967 if (time_before(*expires, ifa->tstamp + lifetime * HZ))
968 *expires = ifa->tstamp + lifetime * HZ;
969 spin_unlock(&ifa->lock);
970 }
971
972 return action;
973}
974
975static void
976cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long expires, bool del_rt)
977{
978 struct rt6_info *rt;
979
980 rt = addrconf_get_prefix_route(&ifp->addr,
981 ifp->prefix_len,
982 ifp->idev->dev,
983 0, RTF_GATEWAY | RTF_DEFAULT);
984 if (rt) {
985 if (del_rt)
986 ip6_del_rt(rt);
987 else {
988 if (!(rt->rt6i_flags & RTF_EXPIRES))
989 rt6_set_expires(rt, expires);
990 ip6_rt_put(rt);
991 }
992 }
993}
994
995
1da177e4
LT		 996/* This function wants to get referenced ifp and releases it before return */
997
998static void ipv6_del_addr(struct inet6_ifaddr *ifp)
999{
4c5ff6a6 1000 int state;
5b84efec
TH		 1001 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_NOP;
1002 unsigned long expires;
1da177e4 1003
c15b1cca
HFS		 1004 ASSERT_RTNL();
1005
4c5ff6a6
HX		 1006 spin_lock_bh(&ifp->state_lock);
1007 state = ifp->state;
e9d3e084 1008 ifp->state = INET6_IFADDR_STATE_DEAD;
4c5ff6a6
HX		 1009 spin_unlock_bh(&ifp->state_lock);
1010
1011 if (state == INET6_IFADDR_STATE_DEAD)
1012 goto out;
1da177e4 1013
5c578aed 1014 spin_lock_bh(&addrconf_hash_lock);
1015 hlist_del_init_rcu(&ifp->addr_lst);
5c578aed 1016 spin_unlock_bh(&addrconf_hash_lock);
1da177e4 1017
5b84efec 1018 write_lock_bh(&ifp->idev->lock);
5d9efa7e 1019
1da177e4 1020 if (ifp->flags&IFA_F_TEMPORARY) {
372e6c8f 1021 list_del(&ifp->tmp_list);
1022 if (ifp->ifpub) {
1023 in6_ifa_put(ifp->ifpub);
1024 ifp->ifpub = NULL;
1da177e4 1025 }
372e6c8f 1026 __in6_ifa_put(ifp);
1da177e4 1027 }
1da177e4 1028
5b84efec
TH		 1029 if (ifp->flags & IFA_F_PERMANENT && !(ifp->flags & IFA_F_NOPREFIXROUTE))
1030 action = check_cleanup_prefix_route(ifp, &expires);
502a2ffd 1031
5b84efec
TH		 1032 list_del_init(&ifp->if_list);
1033 __in6_ifa_put(ifp);
1034
1035 write_unlock_bh(&ifp->idev->lock);
1da177e4 1036
c15b1cca 1037 addrconf_del_dad_work(ifp);
b2238566 1038
1da177e4
LT		 1039 ipv6_ifa_notify(RTM_DELADDR, ifp);
1040
f88c91dd 1041 inet6addr_notifier_call_chain(NETDEV_DOWN, ifp);
1da177e4 1042
5b84efec
TH		 1043 if (action != CLEANUP_PREFIX_RT_NOP) {
1044 cleanup_prefix_route(ifp, expires,
1045 action == CLEANUP_PREFIX_RT_DEL);
1da177e4
LT		 1046 }
1047
c3968a85
DW		 1048 /* clean up prefsrc entries */
1049 rt6_remove_prefsrc(ifp);
4c5ff6a6 1050out:
1da177e4
LT		 1051 in6_ifa_put(ifp);
1052}
1053
1da177e4
LT		 1054static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
1055{
1056 struct inet6_dev *idev = ifp->idev;
1057 struct in6_addr addr, *tmpaddr;
76f793e3 1058 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_tstamp, age;
eac55bf9 1059 unsigned long regen_advance;
1da177e4
LT		 1060 int tmp_plen;
1061 int ret = 0;
95c385b4 1062 u32 addr_flags;
76f793e3 1063 unsigned long now = jiffies;
1da177e4 1064
53bd6749 1065 write_lock_bh(&idev->lock);
1da177e4
LT		 1066 if (ift) {
1067 spin_lock_bh(&ift->lock);
1068 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
1069 spin_unlock_bh(&ift->lock);
1070 tmpaddr = &addr;
1071 } else {
1072 tmpaddr = NULL;
1073 }
1074retry:
1075 in6_dev_hold(idev);
1076 if (idev->cnf.use_tempaddr <= 0) {
53bd6749 1077 write_unlock_bh(&idev->lock);
f3213831 1078 pr_info("%s: use_tempaddr is disabled\n", __func__);
1da177e4
LT		 1079 in6_dev_put(idev);
1080 ret = -1;
1081 goto out;
1082 }
1083 spin_lock_bh(&ifp->lock);
1084 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
1085 idev->cnf.use_tempaddr = -1; /*XXX*/
1086 spin_unlock_bh(&ifp->lock);
53bd6749 1087 write_unlock_bh(&idev->lock);
f3213831
JP		 1088 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n",
1089 __func__);
1da177e4
LT		 1090 in6_dev_put(idev);
1091 ret = -1;
1092 goto out;
1093 }
1094 in6_ifa_hold(ifp);
1095 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
eb7e0575 1096 __ipv6_try_regen_rndid(idev, tmpaddr);
1da177e4 1097 memcpy(&addr.s6_addr[8], idev->rndid, 8);
76f793e3 1098 age = (now - ifp->tstamp) / HZ;
1da177e4
LT		 1099 tmp_valid_lft = min_t(__u32,
1100 ifp->valid_lft,
7a876b0e 1101 idev->cnf.temp_valid_lft + age);
1ab1457c
YH		 1102 tmp_prefered_lft = min_t(__u32,
1103 ifp->prefered_lft,
7a876b0e 1104 idev->cnf.temp_prefered_lft + age -
784e2710 1105 idev->cnf.max_desync_factor);
1da177e4 1106 tmp_plen = ifp->prefix_len;
1da177e4
LT		 1107 tmp_tstamp = ifp->tstamp;
1108 spin_unlock_bh(&ifp->lock);
1109
eac55bf9 1110 regen_advance = idev->cnf.regen_max_retry *
67ba4152
IM		 1111 idev->cnf.dad_transmits *
1112 NEIGH_VAR(idev->nd_parms, RETRANS_TIME) / HZ;
53bd6749 1113 write_unlock_bh(&idev->lock);
95c385b4 1114
eac55bf9
BB		 1115 /* A temporary address is created only if this calculated Preferred
1116 * Lifetime is greater than REGEN_ADVANCE time units. In particular,
1117 * an implementation must not create a temporary address with a zero
1118 * Preferred Lifetime.
ecab6701
HK		 1119 * Use age calculation as in addrconf_verify to avoid unnecessary
1120 * temporary addresses being generated.
eac55bf9 1121 */
ecab6701
HK		 1122 age = (now - tmp_tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
1123 if (tmp_prefered_lft <= regen_advance + age) {
eac55bf9
BB		 1124 in6_ifa_put(ifp);
1125 in6_dev_put(idev);
1126 ret = -1;
1127 goto out;
1128 }
1129
95c385b4
NH		 1130 addr_flags = IFA_F_TEMPORARY;
1131 /* set in addrconf_prefix_rcv() */
1132 if (ifp->flags & IFA_F_OPTIMISTIC)
1133 addr_flags |= IFA_F_OPTIMISTIC;
1134
4b08a8f1
HFS		 1135 ift = ipv6_add_addr(idev, &addr, NULL, tmp_plen,
1136 ipv6_addr_scope(&addr), addr_flags,
1137 tmp_valid_lft, tmp_prefered_lft);
1138 if (IS_ERR(ift)) {
1da177e4
LT		 1139 in6_ifa_put(ifp);
1140 in6_dev_put(idev);
f3213831 1141 pr_info("%s: retry temporary address regeneration\n", __func__);
1da177e4 1142 tmpaddr = &addr;
53bd6749 1143 write_lock_bh(&idev->lock);
1da177e4
LT		 1144 goto retry;
1145 }
1146
1147 spin_lock_bh(&ift->lock);
1148 ift->ifpub = ifp;
76f793e3 1149 ift->cstamp = now;
1da177e4
LT		 1150 ift->tstamp = tmp_tstamp;
1151 spin_unlock_bh(&ift->lock);
1152
cf22f9a2 1153 addrconf_dad_start(ift);
1da177e4
LT		 1154 in6_ifa_put(ift);
1155 in6_dev_put(idev);
1156out:
1157 return ret;
1158}
1da177e4
LT		 1159
1160/*
072047e4 1161 * Choose an appropriate source address (RFC3484)
1da177e4 1162 */
a9b05723
YH		 1163enum {
1164 IPV6_SADDR_RULE_INIT = 0,
1165 IPV6_SADDR_RULE_LOCAL,
1166 IPV6_SADDR_RULE_SCOPE,
1167 IPV6_SADDR_RULE_PREFERRED,
1168#ifdef CONFIG_IPV6_MIP6
1169 IPV6_SADDR_RULE_HOA,
1170#endif
1171 IPV6_SADDR_RULE_OIF,
1172 IPV6_SADDR_RULE_LABEL,
a9b05723 1173 IPV6_SADDR_RULE_PRIVACY,
a9b05723
YH		 1174 IPV6_SADDR_RULE_ORCHID,
1175 IPV6_SADDR_RULE_PREFIX,
7fd2561e
EK		 1176#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1177 IPV6_SADDR_RULE_NOT_OPTIMISTIC,
1178#endif
a9b05723
YH		 1179 IPV6_SADDR_RULE_MAX
1180};
1181
072047e4 1182struct ipv6_saddr_score {
a9b05723
YH		 1183 int rule;
1184 int addr_type;
1185 struct inet6_ifaddr *ifa;
1186 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
1187 int scopedist;
1188 int matchlen;
072047e4
YH		 1189};
1190
a9b05723 1191struct ipv6_saddr_dst {
9acd9f3a 1192 const struct in6_addr *addr;
a9b05723
YH		 1193 int ifindex;
1194 int scope;
1195 int label;
7cbca67c 1196 unsigned int prefs;
a9b05723 1197};
072047e4 1198
b6f99a21 1199static inline int ipv6_saddr_preferred(int type)
1da177e4 1200{
45bb0060 1201 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
072047e4
YH		 1202 return 1;
1203 return 0;
1da177e4
LT		 1204}
1205
7fd2561e
EK		 1206static inline bool ipv6_use_optimistic_addr(struct inet6_dev *idev)
1207{
1208#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1209 return idev && idev->cnf.optimistic_dad && idev->cnf.use_optimistic;
1210#else
1211 return false;
1212#endif
1213}
1214
3de23255
BT		 1215static int ipv6_get_saddr_eval(struct net *net,
1216 struct ipv6_saddr_score *score,
a9b05723
YH		 1217 struct ipv6_saddr_dst *dst,
1218 int i)
1219{
1220 int ret;
1221
1222 if (i <= score->rule) {
1223 switch (i) {
1224 case IPV6_SADDR_RULE_SCOPE:
1225 ret = score->scopedist;
1226 break;
1227 case IPV6_SADDR_RULE_PREFIX:
1228 ret = score->matchlen;
1229 break;
1230 default:
1231 ret = !!test_bit(i, score->scorebits);
1232 }
1233 goto out;
1234 }
1235
1236 switch (i) {
1237 case IPV6_SADDR_RULE_INIT:
1238 /* Rule 0: remember if hiscore is not ready yet */
1239 ret = !!score->ifa;
1240 break;
1241 case IPV6_SADDR_RULE_LOCAL:
1242 /* Rule 1: Prefer same address */
1243 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1244 break;
1245 case IPV6_SADDR_RULE_SCOPE:
1246 /* Rule 2: Prefer appropriate scope
1247 *
1248 * ret
1249 * ^
1250 * -1 | d 15
1251 * ---+--+-+---> scope
1252 * |
1253 * | d is scope of the destination.
1254 * B-d | \
1255 * | \ <- smaller scope is better if
db9c7c39 1256 * B-15 | \ if scope is enough for destination.
a9b05723
YH		 1257 * | ret = B - scope (-1 <= scope >= d <= 15).
1258 * d-C-1 | /
1259 * |/ <- greater is better
1260 * -C / if scope is not enough for destination.
1261 * /| ret = scope - C (-1 <= d < scope <= 15).
1262 *
1263 * d - C - 1 < B -15 (for all -1 <= d <= 15).
1264 * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1265 * Assume B = 0 and we get C > 29.
1266 */
1267 ret = __ipv6_addr_src_scope(score->addr_type);
1268 if (ret >= dst->scope)
1269 ret = -ret;
1270 else
1271 ret -= 128; /* 30 is enough */
1272 score->scopedist = ret;
1273 break;
1274 case IPV6_SADDR_RULE_PREFERRED:
7fd2561e 1275 {
a9b05723 1276 /* Rule 3: Avoid deprecated and optimistic addresses */
7fd2561e
EK		 1277 u8 avoid = IFA_F_DEPRECATED;
1278
1279 if (!ipv6_use_optimistic_addr(score->ifa->idev))
1280 avoid |= IFA_F_OPTIMISTIC;
a9b05723 1281 ret = ipv6_saddr_preferred(score->addr_type) ||
7fd2561e 1282 !(score->ifa->flags & avoid);
a9b05723 1283 break;
7fd2561e 1284 }
a9b05723
YH		 1285#ifdef CONFIG_IPV6_MIP6
1286 case IPV6_SADDR_RULE_HOA:
7cbca67c 1287 {
a9b05723 1288 /* Rule 4: Prefer home address */
7cbca67c
YH		 1289 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1290 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
a9b05723 1291 break;
7cbca67c 1292 }
a9b05723
YH		 1293#endif
1294 case IPV6_SADDR_RULE_OIF:
1295 /* Rule 5: Prefer outgoing interface */
1296 ret = (!dst->ifindex ||
1297 dst->ifindex == score->ifa->idev->dev->ifindex);
1298 break;
1299 case IPV6_SADDR_RULE_LABEL:
1300 /* Rule 6: Prefer matching label */
3de23255
BT		 1301 ret = ipv6_addr_label(net,
1302 &score->ifa->addr, score->addr_type,
a9b05723
YH		 1303 score->ifa->idev->dev->ifindex) == dst->label;
1304 break;
a9b05723 1305 case IPV6_SADDR_RULE_PRIVACY:
7cbca67c 1306 {
a9b05723 1307 /* Rule 7: Prefer public address
25985edc 1308 * Note: prefer temporary address if use_tempaddr >= 2
a9b05723 1309 */
7cbca67c
YH		 1310 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1311 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1312 score->ifa->idev->cnf.use_tempaddr >= 2;
1313 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
a9b05723 1314 break;
7cbca67c 1315 }
a9b05723
YH		 1316 case IPV6_SADDR_RULE_ORCHID:
1317 /* Rule 8-: Prefer ORCHID vs ORCHID or
1318 * non-ORCHID vs non-ORCHID
1319 */
1320 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1321 ipv6_addr_orchid(dst->addr));
1322 break;
1323 case IPV6_SADDR_RULE_PREFIX:
1324 /* Rule 8: Use longest matching prefix */
91b4b04f
YH		 1325 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr);
1326 if (ret > score->ifa->prefix_len)
1327 ret = score->ifa->prefix_len;
1328 score->matchlen = ret;
a9b05723 1329 break;
7fd2561e
EK		 1330#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1331 case IPV6_SADDR_RULE_NOT_OPTIMISTIC:
1332 /* Optimistic addresses still have lower precedence than other
1333 * preferred addresses.
1334 */
1335 ret = !(score->ifa->flags & IFA_F_OPTIMISTIC);
1336 break;
1337#endif
a9b05723
YH		 1338 default:
1339 ret = 0;
1340 }
1341
1342 if (ret)
1343 __set_bit(i, score->scorebits);
1344 score->rule = i;
1345out:
1346 return ret;
1347}
1348
b3f644fc 1349int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev,
9acd9f3a 1350 const struct in6_addr *daddr, unsigned int prefs,
7cbca67c 1351 struct in6_addr *saddr)
1da177e4 1352{
a9b05723
YH		 1353 struct ipv6_saddr_score scores[2],
1354 *score = &scores[0], *hiscore = &scores[1];
a9b05723 1355 struct ipv6_saddr_dst dst;
072047e4 1356 struct net_device *dev;
a9b05723 1357 int dst_type;
1da177e4 1358
a9b05723
YH		 1359 dst_type = __ipv6_addr_type(daddr);
1360 dst.addr = daddr;
1361 dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1362 dst.scope = __ipv6_addr_src_scope(dst_type);
3de23255 1363 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
7cbca67c 1364 dst.prefs = prefs;
a9b05723
YH		 1365
1366 hiscore->rule = -1;
1367 hiscore->ifa = NULL;
1da177e4 1368
8814c4b5 1369 rcu_read_lock();
1da177e4 1370
c6d14c84 1371 for_each_netdev_rcu(net, dev) {
072047e4 1372 struct inet6_dev *idev;
072047e4 1373
a9b05723 1374 /* Candidate Source Address (section 4)
072047e4
YH		 1375 * - multicast and link-local destination address,
1376 * the set of candidate source address MUST only
1377 * include addresses assigned to interfaces
1378 * belonging to the same link as the outgoing
1379 * interface.
1380 * (- For site-local destination addresses, the
1381 * set of candidate source addresses MUST only
1382 * include addresses assigned to interfaces
1383 * belonging to the same site as the outgoing
1384 * interface.)
1385 */
a9b05723
YH		 1386 if (((dst_type & IPV6_ADDR_MULTICAST) ||
1387 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL) &&
1388 dst.ifindex && dev->ifindex != dst.ifindex)
072047e4 1389 continue;
1da177e4 1390
1da177e4 1391 idev = __in6_dev_get(dev);
072047e4
YH		 1392 if (!idev)
1393 continue;
1394
1395 read_lock_bh(&idev->lock);
502a2ffd 1396 list_for_each_entry(score->ifa, &idev->addr_list, if_list) {
a9b05723 1397 int i;
072047e4 1398
a9b05723 1399 /*
6b3ae80a
YH		 1400 * - Tentative Address (RFC2462 section 5.4)
1401 * - A tentative address is not considered
1402 * "assigned to an interface" in the traditional
95c385b4 1403 * sense, unless it is also flagged as optimistic.
6b3ae80a 1404 * - Candidate Source Address (section 4)
072047e4
YH		 1405 * - In any case, anycast addresses, multicast
1406 * addresses, and the unspecified address MUST
1407 * NOT be included in a candidate set.
1408 */
a9b05723
YH		 1409 if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1410 (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
6b3ae80a 1411 continue;
a9b05723
YH		 1412
1413 score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1414
1415 if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1416 score->addr_type & IPV6_ADDR_MULTICAST)) {
ba7a46f1
JP		 1417 net_dbg_ratelimited("ADDRCONF: unspecified / multicast address assigned as unicast address on %s",
1418 dev->name);
072047e4
YH		 1419 continue;
1420 }
1421
a9b05723
YH		 1422 score->rule = -1;
1423 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1424
1425 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1426 int minihiscore, miniscore;
1427
3de23255
BT		 1428 minihiscore = ipv6_get_saddr_eval(net, hiscore, &dst, i);
1429 miniscore = ipv6_get_saddr_eval(net, score, &dst, i);
a9b05723
YH		 1430
1431 if (minihiscore > miniscore) {
1432 if (i == IPV6_SADDR_RULE_SCOPE &&
1433 score->scopedist > 0) {
1434 /*
1435 * special case:
1436 * each remaining entry
1437 * has too small (not enough)
1438 * scope, because ifa entries
1439 * are sorted by their scope
1440 * values.
1441 */
1442 goto try_nextdev;
1443 }
1444 break;
1445 } else if (minihiscore < miniscore) {
a9b05723
YH		 1446 if (hiscore->ifa)
1447 in6_ifa_put(hiscore->ifa);
1448
1449 in6_ifa_hold(score->ifa);
1450
a0bffffc 1451 swap(hiscore, score);
a9b05723
YH		 1452
1453 /* restore our iterator */
1454 score->ifa = hiscore->ifa;
1455
1456 break;
1da177e4 1457 }
072047e4 1458 }
1da177e4 1459 }
a9b05723 1460try_nextdev:
072047e4 1461 read_unlock_bh(&idev->lock);
1da177e4 1462 }
8814c4b5 1463 rcu_read_unlock();
1da177e4 1464
a9b05723 1465 if (!hiscore->ifa)
072047e4 1466 return -EADDRNOTAVAIL;
1ab1457c 1467
4e3fd7a0 1468 *saddr = hiscore->ifa->addr;
a9b05723 1469 in6_ifa_put(hiscore->ifa);
072047e4 1470 return 0;
1da177e4 1471}
5e5f3f0f 1472EXPORT_SYMBOL(ipv6_dev_get_saddr);
1da177e4 1473
8965779d 1474int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr,
479840ff 1475 u32 banned_flags)
b7b1bfce
HFS		 1476{
1477 struct inet6_ifaddr *ifp;
1478 int err = -EADDRNOTAVAIL;
1479
602582ca
HFS		 1480 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
1481 if (ifp->scope > IFA_LINK)
1482 break;
b7b1bfce
HFS		 1483 if (ifp->scope == IFA_LINK &&
1484 !(ifp->flags & banned_flags)) {
1485 *addr = ifp->addr;
1486 err = 0;
1487 break;
1488 }
1489 }
1490 return err;
1491}
1492
95c385b4 1493int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
479840ff 1494 u32 banned_flags)
1da177e4
LT		 1495{
1496 struct inet6_dev *idev;
1497 int err = -EADDRNOTAVAIL;
1498
8814c4b5 1499 rcu_read_lock();
e21e8467
SH		 1500 idev = __in6_dev_get(dev);
1501 if (idev) {
1da177e4 1502 read_lock_bh(&idev->lock);
b7b1bfce 1503 err = __ipv6_get_lladdr(idev, addr, banned_flags);
1da177e4
LT		 1504 read_unlock_bh(&idev->lock);
1505 }
8814c4b5 1506 rcu_read_unlock();
1da177e4
LT		 1507 return err;
1508}
1509
1510static int ipv6_count_addresses(struct inet6_dev *idev)
1511{
1512 int cnt = 0;
1513 struct inet6_ifaddr *ifp;
1514
1515 read_lock_bh(&idev->lock);
502a2ffd 1516 list_for_each_entry(ifp, &idev->addr_list, if_list)
1da177e4
LT		 1517 cnt++;
1518 read_unlock_bh(&idev->lock);
1519 return cnt;
1520}
1521
b71d1d42 1522int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
2a7851bf 1523 const struct net_device *dev, int strict)
1da177e4 1524{
eedf042a 1525 struct inet6_ifaddr *ifp;
ddbe5032 1526 unsigned int hash = inet6_addr_hash(addr);
1da177e4 1527
5c578aed 1528 rcu_read_lock_bh();
b67bfe0d 1529 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
878628fb 1530 if (!net_eq(dev_net(ifp->idev->dev), net))
bfeade08 1531 continue;
1da177e4 1532 if (ipv6_addr_equal(&ifp->addr, addr) &&
eedf042a
SH		 1533 !(ifp->flags&IFA_F_TENTATIVE) &&
1534 (dev == NULL || ifp->idev->dev == dev ||
1535 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) {
1536 rcu_read_unlock_bh();
1537 return 1;
1da177e4
LT		 1538 }
1539 }
5c578aed 1540
eedf042a
SH		 1541 rcu_read_unlock_bh();
1542 return 0;
1da177e4 1543}
7159039a
YH		 1544EXPORT_SYMBOL(ipv6_chk_addr);
1545
3e81c6da
DM		 1546static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1547 struct net_device *dev)
1da177e4 1548{
ddbe5032 1549 unsigned int hash = inet6_addr_hash(addr);
c2e21293 1550 struct inet6_ifaddr *ifp;
1da177e4 1551
b67bfe0d 1552 hlist_for_each_entry(ifp, &inet6_addr_lst[hash], addr_lst) {
878628fb 1553 if (!net_eq(dev_net(ifp->idev->dev), net))
06bfe655 1554 continue;
1da177e4
LT		 1555 if (ipv6_addr_equal(&ifp->addr, addr)) {
1556 if (dev == NULL || ifp->idev->dev == dev)
3e81c6da 1557 return true;
1da177e4
LT		 1558 }
1559 }
3e81c6da 1560 return false;
1da177e4
LT		 1561}
1562
7df37ff3
CB		 1563/* Compares an address/prefix_len with addresses on device @dev.
1564 * If one is found it returns true.
1565 */
1566bool ipv6_chk_custom_prefix(const struct in6_addr *addr,
1567 const unsigned int prefix_len, struct net_device *dev)
1568{
1569 struct inet6_dev *idev;
1570 struct inet6_ifaddr *ifa;
1571 bool ret = false;
1572
1573 rcu_read_lock();
1574 idev = __in6_dev_get(dev);
1575 if (idev) {
1576 read_lock_bh(&idev->lock);
1577 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1578 ret = ipv6_prefix_equal(addr, &ifa->addr, prefix_len);
1579 if (ret)
1580 break;
1581 }
1582 read_unlock_bh(&idev->lock);
1583 }
1584 rcu_read_unlock();
1585
1586 return ret;
1587}
1588EXPORT_SYMBOL(ipv6_chk_custom_prefix);
1589
b71d1d42 1590int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev)
52eeeb84
YH		 1591{
1592 struct inet6_dev *idev;
1593 struct inet6_ifaddr *ifa;
1594 int onlink;
1595
1596 onlink = 0;
1597 rcu_read_lock();
1598 idev = __in6_dev_get(dev);
1599 if (idev) {
1600 read_lock_bh(&idev->lock);
502a2ffd 1601 list_for_each_entry(ifa, &idev->addr_list, if_list) {
52eeeb84
YH		 1602 onlink = ipv6_prefix_equal(addr, &ifa->addr,
1603 ifa->prefix_len);
1604 if (onlink)
1605 break;
1606 }
1607 read_unlock_bh(&idev->lock);
1608 }
1609 rcu_read_unlock();
1610 return onlink;
1611}
52eeeb84
YH		 1612EXPORT_SYMBOL(ipv6_chk_prefix);
1613
9acd9f3a 1614struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1cab3da6 1615 struct net_device *dev, int strict)
1da177e4 1616{
b79d1d54 1617 struct inet6_ifaddr *ifp, *result = NULL;
ddbe5032 1618 unsigned int hash = inet6_addr_hash(addr);
1da177e4 1619
5c578aed 1620 rcu_read_lock_bh();
b67bfe0d 1621 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
878628fb 1622 if (!net_eq(dev_net(ifp->idev->dev), net))
1cab3da6 1623 continue;
1da177e4
LT		 1624 if (ipv6_addr_equal(&ifp->addr, addr)) {
1625 if (dev == NULL || ifp->idev->dev == dev ||
1626 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
b79d1d54 1627 result = ifp;
1da177e4
LT		 1628 in6_ifa_hold(ifp);
1629 break;
1630 }
1631 }
1632 }
5c578aed 1633 rcu_read_unlock_bh();
1da177e4 1634
b79d1d54 1635 return result;
1da177e4
LT		 1636}
1637
1da177e4
LT		 1638/* Gets referenced address, destroys ifaddr */
1639
cc411d0b 1640static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
1da177e4 1641{
1da177e4
LT		 1642 if (ifp->flags&IFA_F_PERMANENT) {
1643 spin_lock_bh(&ifp->lock);
c15b1cca 1644 addrconf_del_dad_work(ifp);
1da177e4 1645 ifp->flags |= IFA_F_TENTATIVE;
cc411d0b
BH		 1646 if (dad_failed)
1647 ifp->flags |= IFA_F_DADFAILED;
1da177e4 1648 spin_unlock_bh(&ifp->lock);
e2577a06
HX		 1649 if (dad_failed)
1650 ipv6_ifa_notify(0, ifp);
1da177e4 1651 in6_ifa_put(ifp);
1da177e4
LT		 1652 } else if (ifp->flags&IFA_F_TEMPORARY) {
1653 struct inet6_ifaddr *ifpub;
1654 spin_lock_bh(&ifp->lock);
1655 ifpub = ifp->ifpub;
1656 if (ifpub) {
1657 in6_ifa_hold(ifpub);
1658 spin_unlock_bh(&ifp->lock);
1659 ipv6_create_tempaddr(ifpub, ifp);
1660 in6_ifa_put(ifpub);
1661 } else {
1662 spin_unlock_bh(&ifp->lock);
1663 }
1664 ipv6_del_addr(ifp);
c15b1cca 1665 } else {
1da177e4 1666 ipv6_del_addr(ifp);
c15b1cca 1667 }
1da177e4
LT		 1668}
1669
f2344a13
HX		 1670static int addrconf_dad_end(struct inet6_ifaddr *ifp)
1671{
1672 int err = -ENOENT;
1673
c15b1cca 1674 spin_lock_bh(&ifp->state_lock);
f2344a13
HX		 1675 if (ifp->state == INET6_IFADDR_STATE_DAD) {
1676 ifp->state = INET6_IFADDR_STATE_POSTDAD;
1677 err = 0;
1678 }
c15b1cca 1679 spin_unlock_bh(&ifp->state_lock);
f2344a13
HX		 1680
1681 return err;
1682}
1683
3c21edbd
YH		 1684void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1685{
1b34be74 1686 struct inet6_dev *idev = ifp->idev;
9bdd8d40 1687
853dc2e0
UB		 1688 if (addrconf_dad_end(ifp)) {
1689 in6_ifa_put(ifp);
f2344a13 1690 return;
853dc2e0 1691 }
f2344a13 1692
e87cc472
JP		 1693 net_info_ratelimited("%s: IPv6 duplicate address %pI6c detected!\n",
1694 ifp->idev->dev->name, &ifp->addr);
9bdd8d40 1695
1b34be74
YH		 1696 if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6) {
1697 struct in6_addr addr;
1698
1699 addr.s6_addr32[0] = htonl(0xfe800000);
1700 addr.s6_addr32[1] = 0;
1701
1702 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
1703 ipv6_addr_equal(&ifp->addr, &addr)) {
1704 /* DAD failed for link-local based on MAC address */
1705 idev->cnf.disable_ipv6 = 1;
9bdd8d40 1706
f3213831 1707 pr_info("%s: IPv6 being disabled!\n",
9bdd8d40 1708 ifp->idev->dev->name);
1b34be74
YH		 1709 }
1710 }
1711
c15b1cca
HFS		 1712 spin_lock_bh(&ifp->state_lock);
1713 /* transition from _POSTDAD to _ERRDAD */
1714 ifp->state = INET6_IFADDR_STATE_ERRDAD;
1715 spin_unlock_bh(&ifp->state_lock);
1716
1717 addrconf_mod_dad_work(ifp, 0);
3c21edbd 1718}
1da177e4 1719
a9ed4a29
SD		 1720/* Join to solicited addr multicast group.
1721 * caller must hold RTNL */
b71d1d42 1722void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr)
1da177e4
LT		 1723{
1724 struct in6_addr maddr;
1725
1726 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1727 return;
1728
1729 addrconf_addr_solict_mult(addr, &maddr);
1730 ipv6_dev_mc_inc(dev, &maddr);
1731}
1732
a9ed4a29 1733/* caller must hold RTNL */
b71d1d42 1734void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr)
1da177e4
LT		 1735{
1736 struct in6_addr maddr;
1737
1738 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1739 return;
1740
1741 addrconf_addr_solict_mult(addr, &maddr);
1742 __ipv6_dev_mc_dec(idev, &maddr);
1743}
1744
a9ed4a29 1745/* caller must hold RTNL */
20380731 1746static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1da177e4
LT		 1747{
1748 struct in6_addr addr;
c15b1cca 1749
88ad3149 1750 if (ifp->prefix_len >= 127) /* RFC 6164 */
2bda8a0c 1751 return;
1da177e4
LT		 1752 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1753 if (ipv6_addr_any(&addr))
1754 return;
013b4d90 1755 __ipv6_dev_ac_inc(ifp->idev, &addr);
1da177e4
LT		 1756}
1757
a9ed4a29 1758/* caller must hold RTNL */
20380731 1759static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1da177e4
LT		 1760{
1761 struct in6_addr addr;
c15b1cca 1762
88ad3149 1763 if (ifp->prefix_len >= 127) /* RFC 6164 */
32019e65 1764 return;
1da177e4
LT		 1765 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1766 if (ipv6_addr_any(&addr))
1767 return;
1768 __ipv6_dev_ac_dec(ifp->idev, &addr);
1769}
1770
073a8e0e
YH		 1771static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
1772{
1773 if (dev->addr_len != ETH_ALEN)
1774 return -1;
1775 memcpy(eui, dev->dev_addr, 3);
1776 memcpy(eui + 5, dev->dev_addr + 3, 3);
1777
1778 /*
1779 * The zSeries OSA network cards can be shared among various
1780 * OS instances, but the OSA cards have only one MAC address.
1781 * This leads to duplicate address conflicts in conjunction
1782 * with IPv6 if more than one instance uses the same card.
1783 *
1784 * The driver for these cards can deliver a unique 16-bit
1785 * identifier for each instance sharing the same card. It is
1786 * placed instead of 0xFFFE in the interface identifier. The
1787 * "u" bit of the interface identifier is not inverted in this
1788 * case. Hence the resulting interface identifier has local
1789 * scope according to RFC2373.
1790 */
1791 if (dev->dev_id) {
1792 eui[3] = (dev->dev_id >> 8) & 0xFF;
1793 eui[4] = dev->dev_id & 0xFF;
1794 } else {
1795 eui[3] = 0xFF;
1796 eui[4] = 0xFE;
1797 eui[0] ^= 2;
1798 }
1799 return 0;
1800}
1801
06a4c1c5 1802static int addrconf_ifid_eui64(u8 *eui, struct net_device *dev)
1803{
1804 if (dev->addr_len != IEEE802154_ADDR_LEN)
1805 return -1;
1806 memcpy(eui, dev->dev_addr, 8);
5e98a36e 1807 eui[0] ^= 2;
06a4c1c5 1808 return 0;
1809}
1810
cb6bf355
YH		 1811static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev)
1812{
1813 union fwnet_hwaddr *ha;
1814
1815 if (dev->addr_len != FWNET_ALEN)
1816 return -1;
1817
1818 ha = (union fwnet_hwaddr *)dev->dev_addr;
1819
1820 memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id));
1821 eui[0] ^= 2;
1822 return 0;
1823}
1824
073a8e0e
YH		 1825static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1826{
1827 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1828 if (dev->addr_len != ARCNET_ALEN)
1829 return -1;
1830 memset(eui, 0, 7);
8e5e8f30 1831 eui[7] = *(u8 *)dev->dev_addr;
073a8e0e
YH		 1832 return 0;
1833}
1834
1835static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1836{
1837 if (dev->addr_len != INFINIBAND_ALEN)
1838 return -1;
1839 memcpy(eui, dev->dev_addr + 12, 8);
1840 eui[0] |= 2;
1841 return 0;
1842}
1843
c61393ea 1844static int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
dfd982ba 1845{
9af28511
SH		 1846 if (addr == 0)
1847 return -1;
dfd982ba
YH		 1848 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
1849 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
1850 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
1851 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
1852 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
1853 ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
1854 eui[1] = 0;
1855 eui[2] = 0x5E;
1856 eui[3] = 0xFE;
1857 memcpy(eui + 4, &addr, 4);
1858 return 0;
1859}
dfd982ba
YH		 1860
1861static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
1862{
1863 if (dev->priv_flags & IFF_ISATAP)
1864 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1865 return -1;
1866}
1867
aee80b54 1868static int addrconf_ifid_gre(u8 *eui, struct net_device *dev)
1869{
1870 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1871}
1872
e837735e
ND		 1873static int addrconf_ifid_ip6tnl(u8 *eui, struct net_device *dev)
1874{
1875 memcpy(eui, dev->perm_addr, 3);
1876 memcpy(eui + 5, dev->perm_addr + 3, 3);
1877 eui[3] = 0xFF;
1878 eui[4] = 0xFE;
1879 eui[0] ^= 2;
1880 return 0;
1881}
1882
1da177e4
LT		 1883static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1884{
1885 switch (dev->type) {
1886 case ARPHRD_ETHER:
1887 case ARPHRD_FDDI:
073a8e0e 1888 return addrconf_ifid_eui48(eui, dev);
1da177e4 1889 case ARPHRD_ARCNET:
073a8e0e 1890 return addrconf_ifid_arcnet(eui, dev);
1da177e4 1891 case ARPHRD_INFINIBAND:
073a8e0e 1892 return addrconf_ifid_infiniband(eui, dev);
c7dc89c0 1893 case ARPHRD_SIT:
dfd982ba 1894 return addrconf_ifid_sit(eui, dev);
aee80b54 1895 case ARPHRD_IPGRE:
1896 return addrconf_ifid_gre(eui, dev);
e74bccb8 1897 case ARPHRD_6LOWPAN:
06a4c1c5 1898 case ARPHRD_IEEE802154:
1899 return addrconf_ifid_eui64(eui, dev);
cb6bf355
YH		 1900 case ARPHRD_IEEE1394:
1901 return addrconf_ifid_ieee1394(eui, dev);
e837735e
ND		 1902 case ARPHRD_TUNNEL6:
1903 return addrconf_ifid_ip6tnl(eui, dev);
1da177e4
LT		 1904 }
1905 return -1;
1906}
1907
1908static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1909{
1910 int err = -1;
1911 struct inet6_ifaddr *ifp;
1912
1913 read_lock_bh(&idev->lock);
602582ca
HFS		 1914 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
1915 if (ifp->scope > IFA_LINK)
1916 break;
1da177e4
LT		 1917 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1918 memcpy(eui, ifp->addr.s6_addr+8, 8);
1919 err = 0;
1920 break;
1921 }
1922 }
1923 read_unlock_bh(&idev->lock);
1924 return err;
1925}
1926
1da177e4 1927/* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
eb7e0575 1928static void __ipv6_regen_rndid(struct inet6_dev *idev)
1da177e4 1929{
1da177e4 1930regen:
955189ef 1931 get_random_bytes(idev->rndid, sizeof(idev->rndid));
1da177e4 1932 idev->rndid[0] &= ~0x02;
1da177e4
LT		 1933
1934 /*
1935 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1936 * check if generated address is not inappropriate
1937 *
1938 * - Reserved subnet anycast (RFC 2526)
1939 * 11111101 11....11 1xxxxxxx
c7dc89c0 1940 * - ISATAP (RFC4214) 6.1
1da177e4
LT		 1941 * 00-00-5E-FE-xx-xx-xx-xx
1942 * - value 0
1943 * - XXX: already assigned to an address on the device
1944 */
1ab1457c 1945 if (idev->rndid[0] == 0xfd &&
1da177e4
LT		 1946 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1947 (idev->rndid[7]&0x80))
1948 goto regen;
1949 if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1950 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1951 goto regen;
1952 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1953 goto regen;
1954 }
1da177e4
LT		 1955}
1956
1957static void ipv6_regen_rndid(unsigned long data)
1958{
1959 struct inet6_dev *idev = (struct inet6_dev *) data;
1960 unsigned long expires;
1961
8814c4b5 1962 rcu_read_lock_bh();
1da177e4
LT		 1963 write_lock_bh(&idev->lock);
1964
1965 if (idev->dead)
1966 goto out;
1967
eb7e0575 1968 __ipv6_regen_rndid(idev);
1ab1457c 1969
1da177e4 1970 expires = jiffies +
1ab1457c 1971 idev->cnf.temp_prefered_lft * HZ -
1f9248e5
JP		 1972 idev->cnf.regen_max_retry * idev->cnf.dad_transmits *
1973 NEIGH_VAR(idev->nd_parms, RETRANS_TIME) -
784e2710 1974 idev->cnf.max_desync_factor * HZ;
1da177e4 1975 if (time_before(expires, jiffies)) {
f3213831
JP		 1976 pr_warn("%s: too short regeneration interval; timer disabled for %s\n",
1977 __func__, idev->dev->name);
1da177e4
LT		 1978 goto out;
1979 }
1980
1981 if (!mod_timer(&idev->regen_timer, expires))
1982 in6_dev_hold(idev);
1983
1984out:
1985 write_unlock_bh(&idev->lock);
8814c4b5 1986 rcu_read_unlock_bh();
1da177e4
LT		 1987 in6_dev_put(idev);
1988}
1989
eb7e0575 1990static void __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr)
8e5e8f30 1991{
1da177e4 1992 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
eb7e0575 1993 __ipv6_regen_rndid(idev);
1da177e4 1994}
1da177e4
LT		 1995
1996/*
1997 * Add prefix route.
1998 */
1999
2000static void
2001addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
e431b8c0 2002 unsigned long expires, u32 flags)
1da177e4 2003{
86872cb5
TG		 2004 struct fib6_config cfg = {
2005 .fc_table = RT6_TABLE_PREFIX,
2006 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2007 .fc_ifindex = dev->ifindex,
2008 .fc_expires = expires,
2009 .fc_dst_len = plen,
2010 .fc_flags = RTF_UP | flags,
c346dca1 2011 .fc_nlinfo.nl_net = dev_net(dev),
f410a1fb 2012 .fc_protocol = RTPROT_KERNEL,
86872cb5 2013 };
1da177e4 2014
4e3fd7a0 2015 cfg.fc_dst = *pfx;
1da177e4
LT		 2016
2017 /* Prevent useless cloning on PtP SIT.
2018 This thing is done here expecting that the whole
2019 class of non-broadcast devices need not cloning.
2020 */
07a93626 2021#if IS_ENABLED(CONFIG_IPV6_SIT)
86872cb5
TG		 2022 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
2023 cfg.fc_flags |= RTF_NONEXTHOP;
0be669bb 2024#endif
1da177e4 2025
86872cb5 2026 ip6_route_add(&cfg);
1da177e4
LT		 2027}
2028
14ef37b6
AH		 2029
2030static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
2031 int plen,
2032 const struct net_device *dev,
2033 u32 flags, u32 noflags)
2034{
2035 struct fib6_node *fn;
2036 struct rt6_info *rt = NULL;
2037 struct fib6_table *table;
2038
2039 table = fib6_get_table(dev_net(dev), RT6_TABLE_PREFIX);
2040 if (table == NULL)
2041 return NULL;
2042
5744dd9b 2043 read_lock_bh(&table->tb6_lock);
14ef37b6
AH		 2044 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0);
2045 if (!fn)
2046 goto out;
2047 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
d1918542 2048 if (rt->dst.dev->ifindex != dev->ifindex)
14ef37b6
AH		 2049 continue;
2050 if ((rt->rt6i_flags & flags) != flags)
2051 continue;
85da53bf 2052 if ((rt->rt6i_flags & noflags) != 0)
14ef37b6
AH		 2053 continue;
2054 dst_hold(&rt->dst);
2055 break;
2056 }
2057out:
5744dd9b 2058 read_unlock_bh(&table->tb6_lock);
14ef37b6
AH		 2059 return rt;
2060}
2061
2062
1da177e4
LT		 2063/* Create "default" multicast route to the interface */
2064
2065static void addrconf_add_mroute(struct net_device *dev)
2066{
86872cb5
TG		 2067 struct fib6_config cfg = {
2068 .fc_table = RT6_TABLE_LOCAL,
2069 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2070 .fc_ifindex = dev->ifindex,
2071 .fc_dst_len = 8,
2072 .fc_flags = RTF_UP,
c346dca1 2073 .fc_nlinfo.nl_net = dev_net(dev),
86872cb5
TG		 2074 };
2075
2076 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
2077
2078 ip6_route_add(&cfg);
1da177e4
LT		 2079}
2080
1da177e4
LT		 2081static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
2082{
2083 struct inet6_dev *idev;
2084
2085 ASSERT_RTNL();
2086
e21e8467
SH		 2087 idev = ipv6_find_idev(dev);
2088 if (!idev)
64e724f6
BH		 2089 return ERR_PTR(-ENOBUFS);
2090
2091 if (idev->cnf.disable_ipv6)
2092 return ERR_PTR(-EACCES);
1da177e4
LT		 2093
2094 /* Add default multicast route */
4af04aba
LW		 2095 if (!(dev->flags & IFF_LOOPBACK))
2096 addrconf_add_mroute(dev);
1da177e4 2097
1da177e4
LT		 2098 return idev;
2099}
2100
53bd6749
JP		 2101static void manage_tempaddrs(struct inet6_dev *idev,
2102 struct inet6_ifaddr *ifp,
2103 __u32 valid_lft, __u32 prefered_lft,
2104 bool create, unsigned long now)
2105{
2106 u32 flags;
2107 struct inet6_ifaddr *ift;
2108
2109 read_lock_bh(&idev->lock);
2110 /* update all temporary addresses in the list */
2111 list_for_each_entry(ift, &idev->tempaddr_list, tmp_list) {
2112 int age, max_valid, max_prefered;
2113
2114 if (ifp != ift->ifpub)
2115 continue;
2116
2117 /* RFC 4941 section 3.3:
2118 * If a received option will extend the lifetime of a public
2119 * address, the lifetimes of temporary addresses should
2120 * be extended, subject to the overall constraint that no
2121 * temporary addresses should ever remain "valid" or "preferred"
2122 * for a time longer than (TEMP_VALID_LIFETIME) or
2123 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), respectively.
2124 */
2125 age = (now - ift->cstamp) / HZ;
2126 max_valid = idev->cnf.temp_valid_lft - age;
2127 if (max_valid < 0)
2128 max_valid = 0;
2129
2130 max_prefered = idev->cnf.temp_prefered_lft -
2131 idev->cnf.max_desync_factor - age;
2132 if (max_prefered < 0)
2133 max_prefered = 0;
2134
2135 if (valid_lft > max_valid)
2136 valid_lft = max_valid;
2137
2138 if (prefered_lft > max_prefered)
2139 prefered_lft = max_prefered;
2140
2141 spin_lock(&ift->lock);
2142 flags = ift->flags;
2143 ift->valid_lft = valid_lft;
2144 ift->prefered_lft = prefered_lft;
2145 ift->tstamp = now;
2146 if (prefered_lft > 0)
2147 ift->flags &= ~IFA_F_DEPRECATED;
2148
2149 spin_unlock(&ift->lock);
2150 if (!(flags&IFA_F_TENTATIVE))
2151 ipv6_ifa_notify(0, ift);
2152 }
2153
2154 if ((create || list_empty(&idev->tempaddr_list)) &&
2155 idev->cnf.use_tempaddr > 0) {
2156 /* When a new public address is created as described
2157 * in [ADDRCONF], also create a new temporary address.
2158 * Also create a temporary address if it's enabled but
2159 * no temporary address currently exists.
2160 */
2161 read_unlock_bh(&idev->lock);
2162 ipv6_create_tempaddr(ifp, NULL);
2163 } else {
2164 read_unlock_bh(&idev->lock);
2165 }
2166}
2167
e6bff995 2168void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao)
1da177e4
LT		 2169{
2170 struct prefix_info *pinfo;
2171 __u32 valid_lft;
2172 __u32 prefered_lft;
2173 int addr_type;
1da177e4 2174 struct inet6_dev *in6_dev;
56d417b1 2175 struct net *net = dev_net(dev);
1da177e4
LT		 2176
2177 pinfo = (struct prefix_info *) opt;
1ab1457c 2178
1da177e4 2179 if (len < sizeof(struct prefix_info)) {
ba3542e1 2180 ADBG("addrconf: prefix option too short\n");
1da177e4
LT		 2181 return;
2182 }
1ab1457c 2183
1da177e4
LT		 2184 /*
2185 * Validation checks ([ADDRCONF], page 19)
2186 */
2187
2188 addr_type = ipv6_addr_type(&pinfo->prefix);
2189
2190 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
2191 return;
2192
2193 valid_lft = ntohl(pinfo->valid);
2194 prefered_lft = ntohl(pinfo->prefered);
2195
2196 if (prefered_lft > valid_lft) {
e87cc472 2197 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n");
1da177e4
LT		 2198 return;
2199 }
2200
2201 in6_dev = in6_dev_get(dev);
2202
2203 if (in6_dev == NULL) {
e87cc472
JP		 2204 net_dbg_ratelimited("addrconf: device %s not configured\n",
2205 dev->name);
1da177e4
LT		 2206 return;
2207 }
2208
2209 /*
2210 * Two things going on here:
2211 * 1) Add routes for on-link prefixes
2212 * 2) Configure prefixes with the auto flag set
2213 */
2214
4bed72e4
YH		 2215 if (pinfo->onlink) {
2216 struct rt6_info *rt;
2217 unsigned long rt_expires;
2218
6f704992
YH		 2219 /* Avoid arithmetic overflow. Really, we could
2220 * save rt_expires in seconds, likely valid_lft,
2221 * but it would require division in fib gc, that it
2222 * not good.
2223 */
4bed72e4
YH		 2224 if (HZ > USER_HZ)
2225 rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
2226 else
2227 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
3dd4bc68 2228
4bed72e4
YH		 2229 if (addrconf_finite_timeout(rt_expires))
2230 rt_expires *= HZ;
1da177e4 2231
14ef37b6
AH		 2232 rt = addrconf_get_prefix_route(&pinfo->prefix,
2233 pinfo->prefix_len,
2234 dev,
2235 RTF_ADDRCONF | RTF_PREFIX_RT,
2236 RTF_GATEWAY | RTF_DEFAULT);
1da177e4 2237
14ef37b6 2238 if (rt) {
6f704992
YH		 2239 /* Autoconf prefix route */
2240 if (valid_lft == 0) {
2241 ip6_del_rt(rt);
2242 rt = NULL;
4bed72e4 2243 } else if (addrconf_finite_timeout(rt_expires)) {
6f704992 2244 /* not infinity */
1716a961 2245 rt6_set_expires(rt, jiffies + rt_expires);
6f704992 2246 } else {
1716a961 2247 rt6_clean_expires(rt);
1da177e4
LT		 2248 }
2249 } else if (valid_lft) {
6f704992 2250 clock_t expires = 0;
4bed72e4
YH		 2251 int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
2252 if (addrconf_finite_timeout(rt_expires)) {
6f704992
YH		 2253 /* not infinity */
2254 flags |= RTF_EXPIRES;
2255 expires = jiffies_to_clock_t(rt_expires);
2256 }
1da177e4 2257 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
6f704992 2258 dev, expires, flags);
1da177e4 2259 }
94e187c0 2260 ip6_rt_put(rt);
1da177e4
LT		 2261 }
2262
2263 /* Try to figure out our local address for this prefix */
2264
2265 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
8e5e8f30 2266 struct inet6_ifaddr *ifp;
1da177e4
LT		 2267 struct in6_addr addr;
2268 int create = 0, update_lft = 0;
617fe29d 2269 bool tokenized = false;
1da177e4
LT		 2270
2271 if (pinfo->prefix_len == 64) {
2272 memcpy(&addr, &pinfo->prefix, 8);
f53adae4
DB		 2273
2274 if (!ipv6_addr_any(&in6_dev->token)) {
2275 read_lock_bh(&in6_dev->lock);
2276 memcpy(addr.s6_addr + 8,
2277 in6_dev->token.s6_addr + 8, 8);
2278 read_unlock_bh(&in6_dev->lock);
617fe29d 2279 tokenized = true;
f53adae4
DB		 2280 } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
2281 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
1da177e4
LT		 2282 in6_dev_put(in6_dev);
2283 return;
2284 }
2285 goto ok;
2286 }
e87cc472
JP		 2287 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n",
2288 pinfo->prefix_len);
1da177e4
LT		 2289 in6_dev_put(in6_dev);
2290 return;
2291
2292ok:
2293
53b7997f 2294 ifp = ipv6_get_ifaddr(net, &addr, dev, 1);
1da177e4
LT		 2295
2296 if (ifp == NULL && valid_lft) {
2297 int max_addresses = in6_dev->cnf.max_addresses;
95c385b4
NH		 2298 u32 addr_flags = 0;
2299
2300#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2301 if (in6_dev->cnf.optimistic_dad &&
e6bff995 2302 !net->ipv6.devconf_all->forwarding && sllao)
95c385b4
NH		 2303 addr_flags = IFA_F_OPTIMISTIC;
2304#endif
1da177e4
LT		 2305
2306 /* Do not allow to create too much of autoconfigured
2307 * addresses; this would be too easy way to crash kernel.
2308 */
2309 if (!max_addresses ||
2310 ipv6_count_addresses(in6_dev) < max_addresses)
3f8f5298
JP		 2311 ifp = ipv6_add_addr(in6_dev, &addr, NULL,
2312 pinfo->prefix_len,
95c385b4 2313 addr_type&IPV6_ADDR_SCOPE_MASK,
8a226b2c
JB		 2314 addr_flags, valid_lft,
2315 prefered_lft);
1da177e4 2316
3f0d2ba0 2317 if (IS_ERR_OR_NULL(ifp)) {
1da177e4
LT		 2318 in6_dev_put(in6_dev);
2319 return;
2320 }
2321
8a226b2c
JB		 2322 update_lft = 0;
2323 create = 1;
c15b1cca
HFS		 2324 spin_lock_bh(&ifp->lock);
2325 ifp->flags |= IFA_F_MANAGETEMPADDR;
1da177e4 2326 ifp->cstamp = jiffies;
617fe29d 2327 ifp->tokenized = tokenized;
c15b1cca 2328 spin_unlock_bh(&ifp->lock);
cf22f9a2 2329 addrconf_dad_start(ifp);
1da177e4
LT		 2330 }
2331
2332 if (ifp) {
479840ff 2333 u32 flags;
1da177e4 2334 unsigned long now;
1da177e4
LT		 2335 u32 stored_lft;
2336
2337 /* update lifetime (RFC2462 5.5.3 e) */
2338 spin_lock(&ifp->lock);
2339 now = jiffies;
2340 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
2341 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
2342 else
2343 stored_lft = 0;
8a226b2c 2344 if (!update_lft && !create && stored_lft) {
9451a304
FF		 2345 const u32 minimum_lft = min_t(u32,
2346 stored_lft, MIN_VALID_LIFETIME);
c9d55d5b
PM		 2347 valid_lft = max(valid_lft, minimum_lft);
2348
2349 /* RFC4862 Section 5.5.3e:
2350 * "Note that the preferred lifetime of the
2351 * corresponding address is always reset to
2352 * the Preferred Lifetime in the received
2353 * Prefix Information option, regardless of
2354 * whether the valid lifetime is also reset or
2355 * ignored."
2356 *
2357 * So we should always update prefered_lft here.
2358 */
2359 update_lft = 1;
1da177e4
LT		 2360 }
2361
2362 if (update_lft) {
2363 ifp->valid_lft = valid_lft;
2364 ifp->prefered_lft = prefered_lft;
2365 ifp->tstamp = now;
2366 flags = ifp->flags;
2367 ifp->flags &= ~IFA_F_DEPRECATED;
2368 spin_unlock(&ifp->lock);
2369
2370 if (!(flags&IFA_F_TENTATIVE))
2371 ipv6_ifa_notify(0, ifp);
2372 } else
2373 spin_unlock(&ifp->lock);
2374
53bd6749
JP		 2375 manage_tempaddrs(in6_dev, ifp, valid_lft, prefered_lft,
2376 create, now);
5d9efa7e 2377
1da177e4 2378 in6_ifa_put(ifp);
c15b1cca 2379 addrconf_verify();
1da177e4
LT		 2380 }
2381 }
2382 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
2383 in6_dev_put(in6_dev);
2384}
2385
2386/*
2387 * Set destination address.
2388 * Special case for SIT interfaces where we create a new "virtual"
2389 * device.
2390 */
af284937 2391int addrconf_set_dstaddr(struct net *net, void __user *arg)
1da177e4
LT		 2392{
2393 struct in6_ifreq ireq;
2394 struct net_device *dev;
2395 int err = -EINVAL;
2396
2397 rtnl_lock();
2398
2399 err = -EFAULT;
2400 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2401 goto err_exit;
2402
af284937 2403 dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
1da177e4
LT		 2404
2405 err = -ENODEV;
2406 if (dev == NULL)
2407 goto err_exit;
2408
07a93626 2409#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4 2410 if (dev->type == ARPHRD_SIT) {
5bc3eb7e 2411 const struct net_device_ops *ops = dev->netdev_ops;
1da177e4 2412 struct ifreq ifr;
1da177e4
LT		 2413 struct ip_tunnel_parm p;
2414
2415 err = -EADDRNOTAVAIL;
2416 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2417 goto err_exit;
2418
2419 memset(&p, 0, sizeof(p));
2420 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2421 p.iph.saddr = 0;
2422 p.iph.version = 4;
2423 p.iph.ihl = 5;
2424 p.iph.protocol = IPPROTO_IPV6;
2425 p.iph.ttl = 64;
d20b3109 2426 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
1da177e4 2427
5bc3eb7e
SH		 2428 if (ops->ndo_do_ioctl) {
2429 mm_segment_t oldfs = get_fs();
2430
2431 set_fs(KERNEL_DS);
2432 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2433 set_fs(oldfs);
2434 } else
2435 err = -EOPNOTSUPP;
1da177e4
LT		 2436
2437 if (err == 0) {
2438 err = -ENOBUFS;
af284937
DL		 2439 dev = __dev_get_by_name(net, p.name);
2440 if (!dev)
1da177e4
LT		 2441 goto err_exit;
2442 err = dev_open(dev);
2443 }
2444 }
0be669bb 2445#endif
1da177e4
LT		 2446
2447err_exit:
2448 rtnl_unlock();
2449 return err;
2450}
2451
2452/*
2453 * Manual configuration of address on an interface
2454 */
479840ff
JP		 2455static int inet6_addr_add(struct net *net, int ifindex,
2456 const struct in6_addr *pfx,
caeaba79 2457 const struct in6_addr *peer_pfx,
479840ff
JP		 2458 unsigned int plen, __u32 ifa_flags,
2459 __u32 prefered_lft, __u32 valid_lft)
1da177e4
LT		 2460{
2461 struct inet6_ifaddr *ifp;
2462 struct inet6_dev *idev;
2463 struct net_device *dev;
2464 int scope;
6f704992
YH		 2465 u32 flags;
2466 clock_t expires;
4bed72e4 2467 unsigned long timeout;
1da177e4
LT		 2468
2469 ASSERT_RTNL();
1ab1457c 2470
24ef0da7
TG		 2471 if (plen > 128)
2472 return -EINVAL;
2473
0778769d
NT		 2474 /* check the lifetime */
2475 if (!valid_lft || prefered_lft > valid_lft)
2476 return -EINVAL;
2477
53bd6749
JP		 2478 if (ifa_flags & IFA_F_MANAGETEMPADDR && plen != 64)
2479 return -EINVAL;
2480
af284937
DL		 2481 dev = __dev_get_by_index(net, ifindex);
2482 if (!dev)
1da177e4 2483 return -ENODEV;
1ab1457c 2484
64e724f6
BH		 2485 idev = addrconf_add_dev(dev);
2486 if (IS_ERR(idev))
2487 return PTR_ERR(idev);
1da177e4
LT		 2488
2489 scope = ipv6_addr_scope(pfx);
2490
4bed72e4
YH		 2491 timeout = addrconf_timeout_fixup(valid_lft, HZ);
2492 if (addrconf_finite_timeout(timeout)) {
2493 expires = jiffies_to_clock_t(timeout * HZ);
2494 valid_lft = timeout;
6f704992 2495 flags = RTF_EXPIRES;
4bed72e4
YH		 2496 } else {
2497 expires = 0;
2498 flags = 0;
2499 ifa_flags |= IFA_F_PERMANENT;
6f704992 2500 }
0778769d 2501
4bed72e4
YH		 2502 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
2503 if (addrconf_finite_timeout(timeout)) {
2504 if (timeout == 0)
2505 ifa_flags |= IFA_F_DEPRECATED;
2506 prefered_lft = timeout;
2507 }
0778769d 2508
8a226b2c
JB		 2509 ifp = ipv6_add_addr(idev, pfx, peer_pfx, plen, scope, ifa_flags,
2510 valid_lft, prefered_lft);
0778769d 2511
1da177e4 2512 if (!IS_ERR(ifp)) {
761aac73
TH		 2513 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) {
2514 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
2515 expires, flags);
2516 }
2517
95c385b4
NH		 2518 /*
2519 * Note that section 3.1 of RFC 4429 indicates
2520 * that the Optimistic flag should not be set for
2521 * manually configured addresses
2522 */
cf22f9a2 2523 addrconf_dad_start(ifp);
53bd6749
JP		 2524 if (ifa_flags & IFA_F_MANAGETEMPADDR)
2525 manage_tempaddrs(idev, ifp, valid_lft, prefered_lft,
2526 true, jiffies);
1da177e4 2527 in6_ifa_put(ifp);
c15b1cca 2528 addrconf_verify_rtnl();
1da177e4
LT		 2529 return 0;
2530 }
2531
2532 return PTR_ERR(ifp);
2533}
2534
6046d5b4
HK		 2535static int inet6_addr_del(struct net *net, int ifindex, u32 ifa_flags,
2536 const struct in6_addr *pfx, unsigned int plen)
1da177e4
LT		 2537{
2538 struct inet6_ifaddr *ifp;
2539 struct inet6_dev *idev;
2540 struct net_device *dev;
1ab1457c 2541
24ef0da7
TG		 2542 if (plen > 128)
2543 return -EINVAL;
2544
af284937
DL		 2545 dev = __dev_get_by_index(net, ifindex);
2546 if (!dev)
1da177e4
LT		 2547 return -ENODEV;
2548
e5d08d71
IM		 2549 idev = __in6_dev_get(dev);
2550 if (idev == NULL)
1da177e4
LT		 2551 return -ENXIO;
2552
2553 read_lock_bh(&idev->lock);
502a2ffd 2554 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1da177e4
LT		 2555 if (ifp->prefix_len == plen &&
2556 ipv6_addr_equal(pfx, &ifp->addr)) {
2557 in6_ifa_hold(ifp);
2558 read_unlock_bh(&idev->lock);
1ab1457c 2559
6046d5b4
HK		 2560 if (!(ifp->flags & IFA_F_TEMPORARY) &&
2561 (ifa_flags & IFA_F_MANAGETEMPADDR))
2562 manage_tempaddrs(idev, ifp, 0, 0, false,
2563 jiffies);
1da177e4 2564 ipv6_del_addr(ifp);
6046d5b4 2565 addrconf_verify_rtnl();
1da177e4
LT		 2566 return 0;
2567 }
2568 }
2569 read_unlock_bh(&idev->lock);
2570 return -EADDRNOTAVAIL;
2571}
2572
2573
af284937 2574int addrconf_add_ifaddr(struct net *net, void __user *arg)
1da177e4
LT		 2575{
2576 struct in6_ifreq ireq;
2577 int err;
1ab1457c 2578
af31f412 2579 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1da177e4 2580 return -EPERM;
1ab1457c 2581
1da177e4
LT		 2582 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2583 return -EFAULT;
2584
2585 rtnl_lock();
caeaba79 2586 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, NULL,
af284937
DL		 2587 ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2588 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
1da177e4
LT		 2589 rtnl_unlock();
2590 return err;
2591}
2592
af284937 2593int addrconf_del_ifaddr(struct net *net, void __user *arg)
1da177e4
LT		 2594{
2595 struct in6_ifreq ireq;
2596 int err;
1ab1457c 2597
af31f412 2598 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1da177e4
LT		 2599 return -EPERM;
2600
2601 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2602 return -EFAULT;
2603
2604 rtnl_lock();
6046d5b4 2605 err = inet6_addr_del(net, ireq.ifr6_ifindex, 0, &ireq.ifr6_addr,
af284937 2606 ireq.ifr6_prefixlen);
1da177e4
LT		 2607 rtnl_unlock();
2608 return err;
2609}
2610
b5f348e5
IJ		 2611static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
2612 int plen, int scope)
2613{
2614 struct inet6_ifaddr *ifp;
2615
8a226b2c 2616 ifp = ipv6_add_addr(idev, addr, NULL, plen,
07edd741
HFS		 2617 scope, IFA_F_PERMANENT,
2618 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
b5f348e5
IJ		 2619 if (!IS_ERR(ifp)) {
2620 spin_lock_bh(&ifp->lock);
2621 ifp->flags &= ~IFA_F_TENTATIVE;
2622 spin_unlock_bh(&ifp->lock);
2623 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2624 in6_ifa_put(ifp);
2625 }
2626}
2627
07a93626 2628#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4
LT		 2629static void sit_add_v4_addrs(struct inet6_dev *idev)
2630{
1da177e4
LT		 2631 struct in6_addr addr;
2632 struct net_device *dev;
c346dca1 2633 struct net *net = dev_net(idev->dev);
929c9cf3 2634 int scope, plen;
f0e2acfa 2635 u32 pflags = 0;
1da177e4
LT		 2636
2637 ASSERT_RTNL();
2638
2639 memset(&addr, 0, sizeof(struct in6_addr));
2640 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2641
2642 if (idev->dev->flags&IFF_POINTOPOINT) {
2643 addr.s6_addr32[0] = htonl(0xfe800000);
2644 scope = IFA_LINK;
929c9cf3 2645 plen = 64;
1da177e4
LT		 2646 } else {
2647 scope = IPV6_ADDR_COMPATv4;
929c9cf3 2648 plen = 96;
f0e2acfa 2649 pflags |= RTF_NONEXTHOP;
1da177e4
LT		 2650 }
2651
2652 if (addr.s6_addr32[3]) {
929c9cf3 2653 add_addr(idev, &addr, plen, scope);
f0e2acfa 2654 addrconf_prefix_route(&addr, plen, idev->dev, 0, pflags);
1da177e4
LT		 2655 return;
2656 }
2657
6fda7350 2658 for_each_netdev(net, dev) {
8e5e8f30 2659 struct in_device *in_dev = __in_dev_get_rtnl(dev);
1da177e4 2660 if (in_dev && (dev->flags & IFF_UP)) {
8e5e8f30 2661 struct in_ifaddr *ifa;
1da177e4
LT		 2662
2663 int flag = scope;
2664
2665 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
1da177e4
LT		 2666
2667 addr.s6_addr32[3] = ifa->ifa_local;
2668
2669 if (ifa->ifa_scope == RT_SCOPE_LINK)
2670 continue;
2671 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2672 if (idev->dev->flags&IFF_POINTOPOINT)
2673 continue;
2674 flag |= IFA_HOST;
2675 }
1da177e4 2676
b5f348e5 2677 add_addr(idev, &addr, plen, flag);
f0e2acfa
ND		 2678 addrconf_prefix_route(&addr, plen, idev->dev, 0,
2679 pflags);
1da177e4
LT		 2680 }
2681 }
1ab1457c 2682 }
1da177e4 2683}
0be669bb 2684#endif
1da177e4
LT		 2685
2686static void init_loopback(struct net_device *dev)
2687{
2688 struct inet6_dev *idev;
25fb6ca4
BK		 2689 struct net_device *sp_dev;
2690 struct inet6_ifaddr *sp_ifa;
2691 struct rt6_info *sp_rt;
1da177e4
LT		 2692
2693 /* ::1 */
2694
2695 ASSERT_RTNL();
2696
e5d08d71
IM		 2697 idev = ipv6_find_idev(dev);
2698 if (idev == NULL) {
91df42be 2699 pr_debug("%s: add_dev failed\n", __func__);
1da177e4
LT		 2700 return;
2701 }
2702
b5f348e5 2703 add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
25fb6ca4
BK		 2704
2705 /* Add routes to other interface's IPv6 addresses */
2706 for_each_netdev(dev_net(dev), sp_dev) {
2707 if (!strcmp(sp_dev->name, dev->name))
2708 continue;
2709
2710 idev = __in6_dev_get(sp_dev);
2711 if (!idev)
2712 continue;
2713
2714 read_lock_bh(&idev->lock);
2715 list_for_each_entry(sp_ifa, &idev->addr_list, if_list) {
2716
2717 if (sp_ifa->flags & (IFA_F_DADFAILED | IFA_F_TENTATIVE))
2718 continue;
2719
33d99113
G		 2720 if (sp_ifa->rt) {
2721 /* This dst has been added to garbage list when
2722 * lo device down, release this obsolete dst and
2723 * reallocate a new router for ifa.
2724 */
2725 if (sp_ifa->rt->dst.obsolete > 0) {
2726 ip6_rt_put(sp_ifa->rt);
2727 sp_ifa->rt = NULL;
2728 } else {
2729 continue;
2730 }
2731 }
a881ae1f 2732
57ec0afe 2733 sp_rt = addrconf_dst_alloc(idev, &sp_ifa->addr, false);
25fb6ca4
BK		 2734
2735 /* Failure cases are ignored */
534c8779
G		 2736 if (!IS_ERR(sp_rt)) {
2737 sp_ifa->rt = sp_rt;
25fb6ca4 2738 ip6_ins_rt(sp_rt);
534c8779 2739 }
25fb6ca4
BK		 2740 }
2741 read_unlock_bh(&idev->lock);
2742 }
1da177e4
LT		 2743}
2744
b71d1d42 2745static void addrconf_add_linklocal(struct inet6_dev *idev, const struct in6_addr *addr)
1da177e4 2746{
8e5e8f30 2747 struct inet6_ifaddr *ifp;
95c385b4
NH		 2748 u32 addr_flags = IFA_F_PERMANENT;
2749
2750#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2751 if (idev->cnf.optimistic_dad &&
702beb87 2752 !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
95c385b4
NH		 2753 addr_flags |= IFA_F_OPTIMISTIC;
2754#endif
1da177e4 2755
95c385b4 2756
07edd741
HFS		 2757 ifp = ipv6_add_addr(idev, addr, NULL, 64, IFA_LINK, addr_flags,
2758 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
1da177e4 2759 if (!IS_ERR(ifp)) {
46d48046 2760 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
cf22f9a2 2761 addrconf_dad_start(ifp);
1da177e4
LT		 2762 in6_ifa_put(ifp);
2763 }
2764}
2765
bc91b0f0
JP		 2766static void addrconf_addr_gen(struct inet6_dev *idev, bool prefix_route)
2767{
2768 if (idev->addr_gen_mode == IN6_ADDR_GEN_MODE_EUI64) {
2769 struct in6_addr addr;
2770
2771 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
2772 /* addrconf_add_linklocal also adds a prefix_route and we
2773 * only need to care about prefix routes if ipv6_generate_eui64
2774 * couldn't generate one.
2775 */
2776 if (ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) == 0)
2777 addrconf_add_linklocal(idev, &addr);
2778 else if (prefix_route)
2779 addrconf_prefix_route(&addr, 64, idev->dev, 0, 0);
2780 }
2781}
2782
1da177e4
LT		 2783static void addrconf_dev_config(struct net_device *dev)
2784{
8e5e8f30 2785 struct inet6_dev *idev;
1da177e4
LT		 2786
2787 ASSERT_RTNL();
2788
74235a25
HX		 2789 if ((dev->type != ARPHRD_ETHER) &&
2790 (dev->type != ARPHRD_FDDI) &&
74235a25 2791 (dev->type != ARPHRD_ARCNET) &&
06a4c1c5 2792 (dev->type != ARPHRD_INFINIBAND) &&
cb6bf355 2793 (dev->type != ARPHRD_IEEE802154) &&
e837735e 2794 (dev->type != ARPHRD_IEEE1394) &&
e74bccb8
JR		 2795 (dev->type != ARPHRD_TUNNEL6) &&
2796 (dev->type != ARPHRD_6LOWPAN)) {
74235a25
HX		 2797 /* Alas, we support only Ethernet autoconfiguration. */
2798 return;
2799 }
2800
1da177e4 2801 idev = addrconf_add_dev(dev);
64e724f6 2802 if (IS_ERR(idev))
1da177e4
LT		 2803 return;
2804
bc91b0f0 2805 addrconf_addr_gen(idev, false);
1da177e4
LT		 2806}
2807
07a93626 2808#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4
LT		 2809static void addrconf_sit_config(struct net_device *dev)
2810{
2811 struct inet6_dev *idev;
2812
2813 ASSERT_RTNL();
2814
1ab1457c
YH		 2815 /*
2816 * Configure the tunnel with one of our IPv4
2817 * addresses... we should configure all of
1da177e4
LT		 2818 * our v4 addrs in the tunnel
2819 */
2820
e5d08d71
IM		 2821 idev = ipv6_find_idev(dev);
2822 if (idev == NULL) {
91df42be 2823 pr_debug("%s: add_dev failed\n", __func__);
1da177e4
LT		 2824 return;
2825 }
2826
c7dc89c0 2827 if (dev->priv_flags & IFF_ISATAP) {
bc91b0f0 2828 addrconf_addr_gen(idev, false);
c7dc89c0
FT		 2829 return;
2830 }
2831
1da177e4
LT		 2832 sit_add_v4_addrs(idev);
2833
62b54dd9 2834 if (dev->flags&IFF_POINTOPOINT)
1da177e4 2835 addrconf_add_mroute(dev);
1da177e4 2836}
0be669bb 2837#endif
1da177e4 2838
07a93626 2839#if IS_ENABLED(CONFIG_NET_IPGRE)
aee80b54 2840static void addrconf_gre_config(struct net_device *dev)
2841{
2842 struct inet6_dev *idev;
aee80b54 2843
aee80b54 2844 ASSERT_RTNL();
2845
e5d08d71
IM		 2846 idev = ipv6_find_idev(dev);
2847 if (idev == NULL) {
91df42be 2848 pr_debug("%s: add_dev failed\n", __func__);
aee80b54 2849 return;
2850 }
2851
bc91b0f0 2852 addrconf_addr_gen(idev, true);
aee80b54 2853}
2854#endif
2855
1ab1457c 2856static int addrconf_notify(struct notifier_block *this, unsigned long event,
351638e7 2857 void *ptr)
1da177e4 2858{
351638e7 2859 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
748e2d93 2860 struct inet6_dev *idev = __in6_dev_get(dev);
c5e33bdd 2861 int run_pending = 0;
b217d616 2862 int err;
1da177e4 2863
e21e8467 2864 switch (event) {
45ba9dd2 2865 case NETDEV_REGISTER:
74235a25 2866 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
45ba9dd2 2867 idev = ipv6_add_dev(dev);
a317a2f1
WC		 2868 if (IS_ERR(idev))
2869 return notifier_from_errno(PTR_ERR(idev));
45ba9dd2
YH		 2870 }
2871 break;
bcdd553f 2872
1da177e4 2873 case NETDEV_UP:
3c21edbd 2874 case NETDEV_CHANGE:
c2edacf8
JV		 2875 if (dev->flags & IFF_SLAVE)
2876 break;
2877
3ce62a84
WC		 2878 if (idev && idev->cnf.disable_ipv6)
2879 break;
2880
3c21edbd 2881 if (event == NETDEV_UP) {
f24e3d65 2882 if (!addrconf_qdisc_ok(dev)) {
3c21edbd 2883 /* device is not ready yet. */
f3213831 2884 pr_info("ADDRCONF(NETDEV_UP): %s: link is not ready\n",
3c21edbd
YH		 2885 dev->name);
2886 break;
2887 }
99081049 2888
d31c7b8f
EP		 2889 if (!idev && dev->mtu >= IPV6_MIN_MTU)
2890 idev = ipv6_add_dev(dev);
2891
a317a2f1 2892 if (!IS_ERR_OR_NULL(idev)) {
99081049 2893 idev->if_flags |= IF_READY;
e3ec6cfc
BT		 2894 run_pending = 1;
2895 }
3c21edbd 2896 } else {
f24e3d65 2897 if (!addrconf_qdisc_ok(dev)) {
3c21edbd
YH		 2898 /* device is still not ready. */
2899 break;
2900 }
2901
2902 if (idev) {
bcdd553f 2903 if (idev->if_flags & IF_READY)
3c21edbd
YH		 2904 /* device is already configured. */
2905 break;
3c21edbd
YH		 2906 idev->if_flags |= IF_READY;
2907 }
2908
f3213831
JP		 2909 pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n",
2910 dev->name);
3c21edbd 2911
c5e33bdd 2912 run_pending = 1;
3c21edbd
YH		 2913 }
2914
e21e8467 2915 switch (dev->type) {
07a93626 2916#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4
LT		 2917 case ARPHRD_SIT:
2918 addrconf_sit_config(dev);
2919 break;
aee80b54 2920#endif
07a93626 2921#if IS_ENABLED(CONFIG_NET_IPGRE)
aee80b54 2922 case ARPHRD_IPGRE:
2923 addrconf_gre_config(dev);
2924 break;
0be669bb 2925#endif
1da177e4
LT		 2926 case ARPHRD_LOOPBACK:
2927 init_loopback(dev);
2928 break;
2929
2930 default:
2931 addrconf_dev_config(dev);
2932 break;
3ff50b79 2933 }
bcdd553f 2934
a317a2f1 2935 if (!IS_ERR_OR_NULL(idev)) {
c5e33bdd
YH		 2936 if (run_pending)
2937 addrconf_dad_run(idev);
2938
bcdd553f
SH		 2939 /*
2940 * If the MTU changed during the interface down,
2941 * when the interface up, the changed MTU must be
2942 * reflected in the idev as well as routers.
1da177e4 2943 */
bcdd553f
SH		 2944 if (idev->cnf.mtu6 != dev->mtu &&
2945 dev->mtu >= IPV6_MIN_MTU) {
1da177e4
LT		 2946 rt6_mtu_change(dev, dev->mtu);
2947 idev->cnf.mtu6 = dev->mtu;
2948 }
2949 idev->tstamp = jiffies;
2950 inet6_ifinfo_notify(RTM_NEWLINK, idev);
bcdd553f
SH		 2951
2952 /*
2953 * If the changed mtu during down is lower than
2954 * IPV6_MIN_MTU stop IPv6 on this interface.
1da177e4
LT		 2955 */
2956 if (dev->mtu < IPV6_MIN_MTU)
bcdd553f 2957 addrconf_ifdown(dev, 1);
1da177e4
LT		 2958 }
2959 break;
2960
2961 case NETDEV_CHANGEMTU:
d31c7b8f 2962 if (idev && dev->mtu >= IPV6_MIN_MTU) {
1da177e4
LT		 2963 rt6_mtu_change(dev, dev->mtu);
2964 idev->cnf.mtu6 = dev->mtu;
2965 break;
2966 }
2967
d31c7b8f
EP		 2968 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2969 idev = ipv6_add_dev(dev);
a317a2f1 2970 if (!IS_ERR(idev))
d31c7b8f
EP		 2971 break;
2972 }
2973
bcdd553f 2974 /*
db9c7c39 2975 * if MTU under IPV6_MIN_MTU.
bcdd553f
SH		 2976 * Stop IPv6 on this interface.
2977 */
1da177e4
LT		 2978
2979 case NETDEV_DOWN:
2980 case NETDEV_UNREGISTER:
2981 /*
2982 * Remove all addresses from this interface.
2983 */
2984 addrconf_ifdown(dev, event != NETDEV_DOWN);
2985 break;
3c21edbd 2986
1da177e4 2987 case NETDEV_CHANGENAME:
1da177e4 2988 if (idev) {
5632c515 2989 snmp6_unregister_dev(idev);
408c4768 2990 addrconf_sysctl_unregister(idev);
a317a2f1 2991 err = addrconf_sysctl_register(idev);
b217d616
HX		 2992 if (err)
2993 return notifier_from_errno(err);
a317a2f1
WC		 2994 err = snmp6_register_dev(idev);
2995 if (err) {
2996 addrconf_sysctl_unregister(idev);
2997 return notifier_from_errno(err);
2998 }
5632c515 2999 }
1da177e4 3000 break;
bcdd553f 3001
93d9b7d7
JP		 3002 case NETDEV_PRE_TYPE_CHANGE:
3003 case NETDEV_POST_TYPE_CHANGE:
3004 addrconf_type_change(dev, event);
75c78500 3005 break;
3ff50b79 3006 }
1da177e4
LT		 3007
3008 return NOTIFY_OK;
3009}
3010
3011/*
3012 * addrconf module should be notified of a device going up
3013 */
3014static struct notifier_block ipv6_dev_notf = {
3015 .notifier_call = addrconf_notify,
1da177e4
LT		 3016};
3017
93d9b7d7 3018static void addrconf_type_change(struct net_device *dev, unsigned long event)
75c78500
MS		 3019{
3020 struct inet6_dev *idev;
3021 ASSERT_RTNL();
3022
3023 idev = __in6_dev_get(dev);
3024
93d9b7d7 3025 if (event == NETDEV_POST_TYPE_CHANGE)
75c78500 3026 ipv6_mc_remap(idev);
93d9b7d7 3027 else if (event == NETDEV_PRE_TYPE_CHANGE)
75c78500
MS		 3028 ipv6_mc_unmap(idev);
3029}
3030
1da177e4
LT		 3031static int addrconf_ifdown(struct net_device *dev, int how)
3032{
c346dca1 3033 struct net *net = dev_net(dev);
502a2ffd 3034 struct inet6_dev *idev;
3035 struct inet6_ifaddr *ifa;
73a8bd74 3036 int state, i;
1da177e4
LT		 3037
3038 ASSERT_RTNL();
3039
73a8bd74
DM		 3040 rt6_ifdown(net, dev);
3041 neigh_ifdown(&nd_tbl, dev);
1da177e4
LT		 3042
3043 idev = __in6_dev_get(dev);
3044 if (idev == NULL)
3045 return -ENODEV;
3046
bcdd553f
SH		 3047 /*
3048 * Step 1: remove reference to ipv6 device from parent device.
3049 * Do not dev_put!
1da177e4 3050 */
439e2385 3051 if (how) {
1da177e4 3052 idev->dead = 1;
8814c4b5
YH		 3053
3054 /* protected by rtnl_lock */
a9b3cd7f 3055 RCU_INIT_POINTER(dev->ip6_ptr, NULL);
1da177e4
LT		 3056
3057 /* Step 1.5: remove snmp6 entry */
3058 snmp6_unregister_dev(idev);
3059
3060 }
3061
73a8bd74
DM		 3062 /* Step 2: clear hash table */
3063 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3064 struct hlist_head *h = &inet6_addr_lst[i];
73a8bd74
DM		 3065
3066 spin_lock_bh(&addrconf_hash_lock);
67ba4152 3067restart:
b67bfe0d 3068 hlist_for_each_entry_rcu(ifa, h, addr_lst) {
73a8bd74
DM		 3069 if (ifa->idev == idev) {
3070 hlist_del_init_rcu(&ifa->addr_lst);
c15b1cca 3071 addrconf_del_dad_work(ifa);
73a8bd74
DM		 3072 goto restart;
3073 }
3074 }
3075 spin_unlock_bh(&addrconf_hash_lock);
3076 }
3077
1da177e4
LT		 3078 write_lock_bh(&idev->lock);
3079
b7b1bfce
HFS		 3080 addrconf_del_rs_timer(idev);
3081
bcdd553f 3082 /* Step 2: clear flags for stateless addrconf */
439e2385 3083 if (!how)
3c21edbd 3084 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
1da177e4 3085
439e2385 3086 if (how && del_timer(&idev->regen_timer))
1da177e4
LT		 3087 in6_dev_put(idev);
3088
bcdd553f 3089 /* Step 3: clear tempaddr list */
372e6c8f 3090 while (!list_empty(&idev->tempaddr_list)) {
3091 ifa = list_first_entry(&idev->tempaddr_list,
3092 struct inet6_ifaddr, tmp_list);
3093 list_del(&ifa->tmp_list);
1da177e4
LT		 3094 write_unlock_bh(&idev->lock);
3095 spin_lock_bh(&ifa->lock);
3096
3097 if (ifa->ifpub) {
3098 in6_ifa_put(ifa->ifpub);
3099 ifa->ifpub = NULL;
3100 }
3101 spin_unlock_bh(&ifa->lock);
3102 in6_ifa_put(ifa);
3103 write_lock_bh(&idev->lock);
3104 }
8f37ada5 3105
502a2ffd 3106 while (!list_empty(&idev->addr_list)) {
3107 ifa = list_first_entry(&idev->addr_list,
3108 struct inet6_ifaddr, if_list);
c15b1cca 3109 addrconf_del_dad_work(ifa);
84e8b803 3110
73a8bd74 3111 list_del(&ifa->if_list);
84e8b803 3112
73a8bd74 3113 write_unlock_bh(&idev->lock);
84e8b803 3114
73a8bd74
DM		 3115 spin_lock_bh(&ifa->state_lock);
3116 state = ifa->state;
3117 ifa->state = INET6_IFADDR_STATE_DEAD;
3118 spin_unlock_bh(&ifa->state_lock);
9d82ca98 3119
73a8bd74
DM		 3120 if (state != INET6_IFADDR_STATE_DEAD) {
3121 __ipv6_ifa_notify(RTM_DELADDR, ifa);
f88c91dd 3122 inet6addr_notifier_call_chain(NETDEV_DOWN, ifa);
27bdb2ab 3123 }
73a8bd74 3124 in6_ifa_put(ifa);
8f37ada5 3125
73a8bd74
DM		 3126 write_lock_bh(&idev->lock);
3127 }
8f37ada5 3128
1da177e4
LT		 3129 write_unlock_bh(&idev->lock);
3130
381f4dca
SD		 3131 /* Step 5: Discard anycast and multicast list */
3132 if (how) {
3133 ipv6_ac_destroy_dev(idev);
1da177e4 3134 ipv6_mc_destroy_dev(idev);
381f4dca 3135 } else {
1da177e4 3136 ipv6_mc_down(idev);
381f4dca 3137 }
1da177e4 3138
1da177e4 3139 idev->tstamp = jiffies;
1ab1457c 3140
bcdd553f 3141 /* Last: Shot the device (if unregistered) */
439e2385 3142 if (how) {
408c4768 3143 addrconf_sysctl_unregister(idev);
1da177e4
LT		 3144 neigh_parms_release(&nd_tbl, idev->nd_parms);
3145 neigh_ifdown(&nd_tbl, dev);
3146 in6_dev_put(idev);
3147 }
3148 return 0;
3149}
3150
3151static void addrconf_rs_timer(unsigned long data)
3152{
b7b1bfce 3153 struct inet6_dev *idev = (struct inet6_dev *)data;
caf92bc4 3154 struct net_device *dev = idev->dev;
b7b1bfce 3155 struct in6_addr lladdr;
1da177e4 3156
b7b1bfce 3157 write_lock(&idev->lock);
5b2a1953 3158 if (idev->dead || !(idev->if_flags & IF_READY))
1da177e4
LT		 3159 goto out;
3160
9ba2add3 3161 if (!ipv6_accept_ra(idev))
5b2a1953 3162 goto out;
3163
3164 /* Announcement received after solicitation was sent */
3165 if (idev->if_flags & IF_RA_RCVD)
1da177e4 3166 goto out;
1da177e4 3167
b7b1bfce 3168 if (idev->rs_probes++ < idev->cnf.rtr_solicits) {
caf92bc4
CW		 3169 write_unlock(&idev->lock);
3170 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
3171 ndisc_send_rs(dev, &lladdr,
b7b1bfce
HFS		 3172 &in6addr_linklocal_allrouters);
3173 else
caf92bc4 3174 goto put;
1da177e4 3175
caf92bc4 3176 write_lock(&idev->lock);
b7b1bfce
HFS		 3177 /* The wait after the last probe can be shorter */
3178 addrconf_mod_rs_timer(idev, (idev->rs_probes ==
3179 idev->cnf.rtr_solicits) ?
3180 idev->cnf.rtr_solicit_delay :
3181 idev->cnf.rtr_solicit_interval);
1da177e4 3182 } else {
1da177e4
LT		 3183 /*
3184 * Note: we do not support deprecated "all on-link"
3185 * assumption any longer.
3186 */
91df42be 3187 pr_debug("%s: no IPv6 routers present\n", idev->dev->name);
1da177e4
LT		 3188 }
3189
3190out:
b7b1bfce 3191 write_unlock(&idev->lock);
caf92bc4 3192put:
b7b1bfce 3193 in6_dev_put(idev);
1da177e4
LT		 3194}
3195
3196/*
3197 * Duplicate Address Detection
3198 */
3c21edbd
YH		 3199static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
3200{
3201 unsigned long rand_num;
3202 struct inet6_dev *idev = ifp->idev;
3203
95c385b4
NH		 3204 if (ifp->flags & IFA_F_OPTIMISTIC)
3205 rand_num = 0;
3206 else
63862b5b 3207 rand_num = prandom_u32() % (idev->cnf.rtr_solicit_delay ? : 1);
95c385b4 3208
b7b1bfce 3209 ifp->dad_probes = idev->cnf.dad_transmits;
c15b1cca 3210 addrconf_mod_dad_work(ifp, rand_num);
3c21edbd
YH		 3211}
3212
c15b1cca 3213static void addrconf_dad_begin(struct inet6_ifaddr *ifp)
1da177e4
LT		 3214{
3215 struct inet6_dev *idev = ifp->idev;
3216 struct net_device *dev = idev->dev;
1da177e4
LT		 3217
3218 addrconf_join_solict(dev, &ifp->addr);
3219
63862b5b 3220 prandom_seed((__force u32) ifp->addr.s6_addr32[3]);
1da177e4
LT		 3221
3222 read_lock_bh(&idev->lock);
622ccdf1 3223 spin_lock(&ifp->lock);
e9d3e084 3224 if (ifp->state == INET6_IFADDR_STATE_DEAD)
1da177e4 3225 goto out;
1da177e4
LT		 3226
3227 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
1b34be74 3228 idev->cnf.accept_dad < 1 ||
55ebaef1
NT		 3229 !(ifp->flags&IFA_F_TENTATIVE) ||
3230 ifp->flags & IFA_F_NODAD) {
cc411d0b 3231 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
21809faf 3232 spin_unlock(&ifp->lock);
1da177e4
LT		 3233 read_unlock_bh(&idev->lock);
3234
3235 addrconf_dad_completed(ifp);
3236 return;
3237 }
3238
6732bade 3239 if (!(idev->if_flags & IF_READY)) {
21809faf 3240 spin_unlock(&ifp->lock);
6732bade 3241 read_unlock_bh(&idev->lock);
3c21edbd 3242 /*
590a9887 3243 * If the device is not ready:
3c21edbd
YH		 3244 * - keep it tentative if it is a permanent address.
3245 * - otherwise, kill it.
3246 */
3247 in6_ifa_hold(ifp);
cc411d0b 3248 addrconf_dad_stop(ifp, 0);
6732bade 3249 return;
3c21edbd 3250 }
95c385b4
NH		 3251
3252 /*
3253 * Optimistic nodes can start receiving
3254 * Frames right away
3255 */
7fd2561e 3256 if (ifp->flags & IFA_F_OPTIMISTIC) {
95c385b4 3257 ip6_ins_rt(ifp->rt);
7fd2561e
EK		 3258 if (ipv6_use_optimistic_addr(idev)) {
3259 /* Because optimistic nodes can use this address,
3260 * notify listeners. If DAD fails, RTM_DELADDR is sent.
3261 */
3262 ipv6_ifa_notify(RTM_NEWADDR, ifp);
3263 }
3264 }
95c385b4 3265
6732bade 3266 addrconf_dad_kick(ifp);
1da177e4 3267out:
622ccdf1 3268 spin_unlock(&ifp->lock);
1da177e4
LT		 3269 read_unlock_bh(&idev->lock);
3270}
3271
c15b1cca 3272static void addrconf_dad_start(struct inet6_ifaddr *ifp)
1da177e4 3273{
c15b1cca
HFS		 3274 bool begin_dad = false;
3275
3276 spin_lock_bh(&ifp->state_lock);
3277 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
3278 ifp->state = INET6_IFADDR_STATE_PREDAD;
3279 begin_dad = true;
3280 }
3281 spin_unlock_bh(&ifp->state_lock);
3282
3283 if (begin_dad)
3284 addrconf_mod_dad_work(ifp, 0);
3285}
3286
3287static void addrconf_dad_work(struct work_struct *w)
3288{
3289 struct inet6_ifaddr *ifp = container_of(to_delayed_work(w),
3290 struct inet6_ifaddr,
3291 dad_work);
1da177e4 3292 struct inet6_dev *idev = ifp->idev;
1da177e4
LT		 3293 struct in6_addr mcaddr;
3294
c15b1cca
HFS		 3295 enum {
3296 DAD_PROCESS,
3297 DAD_BEGIN,
3298 DAD_ABORT,
3299 } action = DAD_PROCESS;
3300
3301 rtnl_lock();
3302
3303 spin_lock_bh(&ifp->state_lock);
3304 if (ifp->state == INET6_IFADDR_STATE_PREDAD) {
3305 action = DAD_BEGIN;
3306 ifp->state = INET6_IFADDR_STATE_DAD;
3307 } else if (ifp->state == INET6_IFADDR_STATE_ERRDAD) {
3308 action = DAD_ABORT;
3309 ifp->state = INET6_IFADDR_STATE_POSTDAD;
3310 }
3311 spin_unlock_bh(&ifp->state_lock);
3312
3313 if (action == DAD_BEGIN) {
3314 addrconf_dad_begin(ifp);
3315 goto out;
3316 } else if (action == DAD_ABORT) {
3317 addrconf_dad_stop(ifp, 1);
3318 goto out;
3319 }
3320
b7b1bfce 3321 if (!ifp->dad_probes && addrconf_dad_end(ifp))
f2344a13
HX		 3322 goto out;
3323
c15b1cca 3324 write_lock_bh(&idev->lock);
122e4519 3325 if (idev->dead || !(idev->if_flags & IF_READY)) {
c15b1cca 3326 write_unlock_bh(&idev->lock);
1da177e4
LT		 3327 goto out;
3328 }
21809faf 3329
3330 spin_lock(&ifp->lock);
622ccdf1
HX		 3331 if (ifp->state == INET6_IFADDR_STATE_DEAD) {
3332 spin_unlock(&ifp->lock);
c15b1cca 3333 write_unlock_bh(&idev->lock);
622ccdf1
HX		 3334 goto out;
3335 }
3336
b7b1bfce 3337 if (ifp->dad_probes == 0) {
1da177e4
LT		 3338 /*
3339 * DAD was successful
3340 */
3341
cc411d0b 3342 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
21809faf 3343 spin_unlock(&ifp->lock);
c15b1cca 3344 write_unlock_bh(&idev->lock);
1da177e4
LT		 3345
3346 addrconf_dad_completed(ifp);
3347
3348 goto out;
3349 }
3350
b7b1bfce 3351 ifp->dad_probes--;
c15b1cca
HFS		 3352 addrconf_mod_dad_work(ifp,
3353 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME));
21809faf 3354 spin_unlock(&ifp->lock);
c15b1cca 3355 write_unlock_bh(&idev->lock);
1da177e4
LT		 3356
3357 /* send a neighbour solicitation for our addr */
1da177e4 3358 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
d7aabf22 3359 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &in6addr_any);
1da177e4
LT		 3360out:
3361 in6_ifa_put(ifp);
c15b1cca 3362 rtnl_unlock();
1da177e4
LT		 3363}
3364
11ffff75
HFS		 3365/* ifp->idev must be at least read locked */
3366static bool ipv6_lonely_lladdr(struct inet6_ifaddr *ifp)
3367{
3368 struct inet6_ifaddr *ifpiter;
3369 struct inet6_dev *idev = ifp->idev;
3370
602582ca
HFS		 3371 list_for_each_entry_reverse(ifpiter, &idev->addr_list, if_list) {
3372 if (ifpiter->scope > IFA_LINK)
3373 break;
11ffff75
HFS		 3374 if (ifp != ifpiter && ifpiter->scope == IFA_LINK &&
3375 (ifpiter->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE|
3376 IFA_F_OPTIMISTIC|IFA_F_DADFAILED)) ==
3377 IFA_F_PERMANENT)
3378 return false;
3379 }
3380 return true;
3381}
3382
1da177e4
LT		 3383static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
3384{
e21e8467 3385 struct net_device *dev = ifp->idev->dev;
b7b1bfce 3386 struct in6_addr lladdr;
b173ee48 3387 bool send_rs, send_mld;
b7b1bfce 3388
c15b1cca 3389 addrconf_del_dad_work(ifp);
1da177e4
LT		 3390
3391 /*
3392 * Configure the address for reception. Now it is valid.
3393 */
3394
3395 ipv6_ifa_notify(RTM_NEWADDR, ifp);
3396
026359bc
TA		 3397 /* If added prefix is link local and we are prepared to process
3398 router advertisements, start sending router solicitations.
1da177e4
LT		 3399 */
3400
1ec047eb 3401 read_lock_bh(&ifp->idev->lock);
11ffff75 3402 send_mld = ifp->scope == IFA_LINK && ipv6_lonely_lladdr(ifp);
b173ee48
HFS		 3403 send_rs = send_mld &&
3404 ipv6_accept_ra(ifp->idev) &&
1ec047eb 3405 ifp->idev->cnf.rtr_solicits > 0 &&
b173ee48 3406 (dev->flags&IFF_LOOPBACK) == 0;
1ec047eb
HFS		 3407 read_unlock_bh(&ifp->idev->lock);
3408
b173ee48
HFS		 3409 /* While dad is in progress mld report's source address is in6_addrany.
3410 * Resend with proper ll now.
3411 */
3412 if (send_mld)
3413 ipv6_mc_dad_complete(ifp->idev);
3414
1ec047eb 3415 if (send_rs) {
1da177e4
LT		 3416 /*
3417 * If a host as already performed a random delay
3418 * [...] as part of DAD [...] there is no need
3419 * to delay again before sending the first RS
3420 */
1ec047eb 3421 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
b7b1bfce 3422 return;
1ec047eb 3423 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters);
1da177e4 3424
b7b1bfce
HFS		 3425 write_lock_bh(&ifp->idev->lock);
3426 spin_lock(&ifp->lock);
3427 ifp->idev->rs_probes = 1;
1da177e4 3428 ifp->idev->if_flags |= IF_RS_SENT;
b7b1bfce
HFS		 3429 addrconf_mod_rs_timer(ifp->idev,
3430 ifp->idev->cnf.rtr_solicit_interval);
3431 spin_unlock(&ifp->lock);
3432 write_unlock_bh(&ifp->idev->lock);
1da177e4
LT		 3433 }
3434}
3435
e21e8467
SH		 3436static void addrconf_dad_run(struct inet6_dev *idev)
3437{
c5e33bdd
YH		 3438 struct inet6_ifaddr *ifp;
3439
3440 read_lock_bh(&idev->lock);
502a2ffd 3441 list_for_each_entry(ifp, &idev->addr_list, if_list) {
21809faf 3442 spin_lock(&ifp->lock);
f2344a13
HX		 3443 if (ifp->flags & IFA_F_TENTATIVE &&
3444 ifp->state == INET6_IFADDR_STATE_DAD)
3445 addrconf_dad_kick(ifp);
21809faf 3446 spin_unlock(&ifp->lock);
c5e33bdd
YH		 3447 }
3448 read_unlock_bh(&idev->lock);
3449}
3450
1da177e4
LT		 3451#ifdef CONFIG_PROC_FS
3452struct if6_iter_state {
3c40090a 3453 struct seq_net_private p;
1da177e4 3454 int bucket;
1d578303 3455 int offset;
1da177e4
LT		 3456};
3457
1d578303 3458static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos)
1da177e4
LT		 3459{
3460 struct inet6_ifaddr *ifa = NULL;
3461 struct if6_iter_state *state = seq->private;
1218854a 3462 struct net *net = seq_file_net(seq);
1d578303 3463 int p = 0;
1da177e4 3464
1d578303
MM		 3465 /* initial bucket if pos is 0 */
3466 if (pos == 0) {
3467 state->bucket = 0;
3468 state->offset = 0;
3469 }
3470
3471 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
b67bfe0d 3472 hlist_for_each_entry_rcu_bh(ifa, &inet6_addr_lst[state->bucket],
1d578303 3473 addr_lst) {
9f0d3c27
ED		 3474 if (!net_eq(dev_net(ifa->idev->dev), net))
3475 continue;
1d578303
MM		 3476 /* sync with offset */
3477 if (p < state->offset) {
3478 p++;
3479 continue;
3480 }
3481 state->offset++;
9f0d3c27 3482 return ifa;
1d578303
MM		 3483 }
3484
3485 /* prepare for next bucket */
3486 state->offset = 0;
3487 p = 0;
1da177e4 3488 }
c2e21293 3489 return NULL;
1da177e4
LT		 3490}
3491
c2e21293 3492static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
3493 struct inet6_ifaddr *ifa)
1da177e4
LT		 3494{
3495 struct if6_iter_state *state = seq->private;
1218854a 3496 struct net *net = seq_file_net(seq);
1da177e4 3497
b67bfe0d 3498 hlist_for_each_entry_continue_rcu_bh(ifa, addr_lst) {
9f0d3c27
ED		 3499 if (!net_eq(dev_net(ifa->idev->dev), net))
3500 continue;
1d578303 3501 state->offset++;
9f0d3c27 3502 return ifa;
1d578303 3503 }
3c40090a 3504
c2e21293 3505 while (++state->bucket < IN6_ADDR_HSIZE) {
1d578303 3506 state->offset = 0;
b67bfe0d 3507 hlist_for_each_entry_rcu_bh(ifa,
c2e21293 3508 &inet6_addr_lst[state->bucket], addr_lst) {
9f0d3c27
ED		 3509 if (!net_eq(dev_net(ifa->idev->dev), net))
3510 continue;
1d578303 3511 state->offset++;
9f0d3c27 3512 return ifa;
c2e21293 3513 }
1da177e4 3514 }
3c40090a 3515
c2e21293 3516 return NULL;
1da177e4
LT		 3517}
3518
1da177e4 3519static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
4f70ecca 3520 __acquires(rcu_bh)
1da177e4 3521{
5c578aed 3522 rcu_read_lock_bh();
1d578303 3523 return if6_get_first(seq, *pos);
1da177e4
LT		 3524}
3525
3526static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3527{
3528 struct inet6_ifaddr *ifa;
3529
3530 ifa = if6_get_next(seq, v);
3531 ++*pos;
3532 return ifa;
3533}
3534
3535static void if6_seq_stop(struct seq_file *seq, void *v)
4f70ecca 3536 __releases(rcu_bh)
1da177e4 3537{
5c578aed 3538 rcu_read_unlock_bh();
1da177e4
LT		 3539}
3540
3541static int if6_seq_show(struct seq_file *seq, void *v)
3542{
3543 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
971a351c 3544 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
b071195d 3545 &ifp->addr,
1da177e4
LT		 3546 ifp->idev->dev->ifindex,
3547 ifp->prefix_len,
3548 ifp->scope,
971a351c 3549 (u8) ifp->flags,
1da177e4
LT		 3550 ifp->idev->dev->name);
3551 return 0;
3552}
3553
56b3d975 3554static const struct seq_operations if6_seq_ops = {
1da177e4
LT		 3555 .start = if6_seq_start,
3556 .next = if6_seq_next,
3557 .show = if6_seq_show,
3558 .stop = if6_seq_stop,
3559};
3560
3561static int if6_seq_open(struct inode *inode, struct file *file)
3562{
3c40090a
DL		 3563 return seq_open_net(inode, file, &if6_seq_ops,
3564 sizeof(struct if6_iter_state));
1da177e4
LT		 3565}
3566
9a32144e 3567static const struct file_operations if6_fops = {
1da177e4
LT		 3568 .owner = THIS_MODULE,
3569 .open = if6_seq_open,
3570 .read = seq_read,
3571 .llseek = seq_lseek,
3c40090a 3572 .release = seq_release_net,
1da177e4
LT		 3573};
3574
2c8c1e72 3575static int __net_init if6_proc_net_init(struct net *net)
1da177e4 3576{
d4beaa66 3577 if (!proc_create("if_inet6", S_IRUGO, net->proc_net, &if6_fops))
1da177e4
LT		 3578 return -ENOMEM;
3579 return 0;
3580}
3581
2c8c1e72 3582static void __net_exit if6_proc_net_exit(struct net *net)
3c40090a 3583{
ece31ffd 3584 remove_proc_entry("if_inet6", net->proc_net);
3c40090a
DL		 3585}
3586
3587static struct pernet_operations if6_proc_net_ops = {
67ba4152
IM		 3588 .init = if6_proc_net_init,
3589 .exit = if6_proc_net_exit,
3c40090a
DL		 3590};
3591
3592int __init if6_proc_init(void)
3593{
3594 return register_pernet_subsys(&if6_proc_net_ops);
3595}
3596
1da177e4
LT		 3597void if6_proc_exit(void)
3598{
3c40090a 3599 unregister_pernet_subsys(&if6_proc_net_ops);
1da177e4
LT		 3600}
3601#endif /* CONFIG_PROC_FS */
3602
07a93626 3603#if IS_ENABLED(CONFIG_IPV6_MIP6)
3b9f9a1c 3604/* Check if address is a home address configured on any interface. */
b71d1d42 3605int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr)
3b9f9a1c
NT		 3606{
3607 int ret = 0;
c2e21293 3608 struct inet6_ifaddr *ifp = NULL;
ddbe5032 3609 unsigned int hash = inet6_addr_hash(addr);
c2e21293 3610
5c578aed 3611 rcu_read_lock_bh();
b67bfe0d 3612 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
878628fb 3613 if (!net_eq(dev_net(ifp->idev->dev), net))
389f6612 3614 continue;
caad295f 3615 if (ipv6_addr_equal(&ifp->addr, addr) &&
3b9f9a1c
NT		 3616 (ifp->flags & IFA_F_HOMEADDRESS)) {
3617 ret = 1;
3618 break;
3619 }
3620 }
5c578aed 3621 rcu_read_unlock_bh();
3b9f9a1c
NT		 3622 return ret;
3623}
3624#endif
3625
1da177e4
LT		 3626/*
3627 * Periodic address status verification
3628 */
3629
c15b1cca 3630static void addrconf_verify_rtnl(void)
1da177e4 3631{
b2db7564 3632 unsigned long now, next, next_sec, next_sched;
1da177e4 3633 struct inet6_ifaddr *ifp;
1da177e4
LT		 3634 int i;
3635
c15b1cca
HFS		 3636 ASSERT_RTNL();
3637
5c578aed 3638 rcu_read_lock_bh();
1da177e4 3639 now = jiffies;
b2db7564 3640 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
1da177e4 3641
c15b1cca 3642 cancel_delayed_work(&addr_chk_work);
1da177e4 3643
bcdd553f 3644 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
1da177e4 3645restart:
c15b1cca 3646 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[i], addr_lst) {
1da177e4 3647 unsigned long age;
1da177e4 3648
fad8da3e
YA		 3649 /* When setting preferred_lft to a value not zero or
3650 * infinity, while valid_lft is infinity
3651 * IFA_F_PERMANENT has a non-infinity life time.
3652 */
3653 if ((ifp->flags & IFA_F_PERMANENT) &&
3654 (ifp->prefered_lft == INFINITY_LIFE_TIME))
1da177e4
LT		 3655 continue;
3656
3657 spin_lock(&ifp->lock);
b2db7564
YH		 3658 /* We try to batch several events at once. */
3659 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
1da177e4 3660
8f27ebb9
YH		 3661 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
3662 age >= ifp->valid_lft) {
1da177e4
LT		 3663 spin_unlock(&ifp->lock);
3664 in6_ifa_hold(ifp);
1da177e4
LT		 3665 ipv6_del_addr(ifp);
3666 goto restart;
8f27ebb9
YH		 3667 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
3668 spin_unlock(&ifp->lock);
3669 continue;
1da177e4 3670 } else if (age >= ifp->prefered_lft) {
a1ed0526 3671 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
1da177e4
LT		 3672 int deprecate = 0;
3673
3674 if (!(ifp->flags&IFA_F_DEPRECATED)) {
3675 deprecate = 1;
3676 ifp->flags |= IFA_F_DEPRECATED;
3677 }
3678
fad8da3e
YA		 3679 if ((ifp->valid_lft != INFINITY_LIFE_TIME) &&
3680 (time_before(ifp->tstamp + ifp->valid_lft * HZ, next)))
1da177e4
LT		 3681 next = ifp->tstamp + ifp->valid_lft * HZ;
3682
3683 spin_unlock(&ifp->lock);
3684
3685 if (deprecate) {
3686 in6_ifa_hold(ifp);
1da177e4
LT		 3687
3688 ipv6_ifa_notify(0, ifp);
3689 in6_ifa_put(ifp);
3690 goto restart;
3691 }
1da177e4
LT		 3692 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
3693 !(ifp->flags&IFA_F_TENTATIVE)) {
88949cf4 3694 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
3695 ifp->idev->cnf.dad_transmits *
1f9248e5 3696 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME) / HZ;
88949cf4 3697
1da177e4
LT		 3698 if (age >= ifp->prefered_lft - regen_advance) {
3699 struct inet6_ifaddr *ifpub = ifp->ifpub;
3700 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3701 next = ifp->tstamp + ifp->prefered_lft * HZ;
3702 if (!ifp->regen_count && ifpub) {
3703 ifp->regen_count++;
3704 in6_ifa_hold(ifp);
3705 in6_ifa_hold(ifpub);
3706 spin_unlock(&ifp->lock);
5c578aed 3707
291d809b
HY		 3708 spin_lock(&ifpub->lock);
3709 ifpub->regen_count = 0;
3710 spin_unlock(&ifpub->lock);
1da177e4
LT		 3711 ipv6_create_tempaddr(ifpub, ifp);
3712 in6_ifa_put(ifpub);
3713 in6_ifa_put(ifp);
3714 goto restart;
3715 }
3716 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
3717 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
3718 spin_unlock(&ifp->lock);
1da177e4
LT		 3719 } else {
3720 /* ifp->prefered_lft <= ifp->valid_lft */
3721 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3722 next = ifp->tstamp + ifp->prefered_lft * HZ;
3723 spin_unlock(&ifp->lock);
3724 }
3725 }
1da177e4
LT		 3726 }
3727
b2db7564
YH		 3728 next_sec = round_jiffies_up(next);
3729 next_sched = next;
3730
3731 /* If rounded timeout is accurate enough, accept it. */
3732 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
3733 next_sched = next_sec;
3734
3735 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
3736 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
3737 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
3738
ba3542e1 3739 ADBG(KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
3740 now, next, next_sec, next_sched);
c15b1cca 3741 mod_delayed_work(addrconf_wq, &addr_chk_work, next_sched - now);
5c578aed 3742 rcu_read_unlock_bh();
1da177e4
LT		 3743}
3744
c15b1cca
HFS		 3745static void addrconf_verify_work(struct work_struct *w)
3746{
3747 rtnl_lock();
3748 addrconf_verify_rtnl();
3749 rtnl_unlock();
3750}
3751
3752static void addrconf_verify(void)
3753{
3754 mod_delayed_work(addrconf_wq, &addr_chk_work, 0);
3755}
3756
caeaba79
ND		 3757static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local,
3758 struct in6_addr **peer_pfx)
461d8837
TG		 3759{
3760 struct in6_addr *pfx = NULL;
3761
caeaba79
ND		 3762 *peer_pfx = NULL;
3763
461d8837
TG		 3764 if (addr)
3765 pfx = nla_data(addr);
3766
3767 if (local) {
3768 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
caeaba79
ND		 3769 *peer_pfx = pfx;
3770 pfx = nla_data(local);
461d8837
TG		 3771 }
3772
3773 return pfx;
3774}
3775
ef7c79ed 3776static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
461d8837
TG		 3777 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
3778 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
3779 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
479840ff 3780 [IFA_FLAGS] = { .len = sizeof(u32) },
461d8837
TG		 3781};
3782
1da177e4 3783static int
661d2967 3784inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh)
1da177e4 3785{
3b1e0a65 3786 struct net *net = sock_net(skb->sk);
b933f716
TG		 3787 struct ifaddrmsg *ifm;
3788 struct nlattr *tb[IFA_MAX+1];
caeaba79 3789 struct in6_addr *pfx, *peer_pfx;
6046d5b4 3790 u32 ifa_flags;
b933f716 3791 int err;
1da177e4 3792
b933f716
TG		 3793 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3794 if (err < 0)
3795 return err;
3796
3797 ifm = nlmsg_data(nlh);
caeaba79 3798 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
1da177e4
LT		 3799 if (pfx == NULL)
3800 return -EINVAL;
3801
6046d5b4
HK		 3802 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
3803
3804 /* We ignore other flags so far. */
3805 ifa_flags &= IFA_F_MANAGETEMPADDR;
3806
3807 return inet6_addr_del(net, ifm->ifa_index, ifa_flags, pfx,
3808 ifm->ifa_prefixlen);
1da177e4
LT		 3809}
3810
479840ff 3811static int inet6_addr_modify(struct inet6_ifaddr *ifp, u32 ifa_flags,
55ebaef1 3812 u32 prefered_lft, u32 valid_lft)
081bba5b 3813{
6f704992
YH		 3814 u32 flags;
3815 clock_t expires;
4bed72e4 3816 unsigned long timeout;
53bd6749 3817 bool was_managetempaddr;
5b84efec 3818 bool had_prefixroute;
46d48046 3819
c15b1cca
HFS		 3820 ASSERT_RTNL();
3821
081bba5b
NT		 3822 if (!valid_lft || (prefered_lft > valid_lft))
3823 return -EINVAL;
3824
53bd6749
JP		 3825 if (ifa_flags & IFA_F_MANAGETEMPADDR &&
3826 (ifp->flags & IFA_F_TEMPORARY || ifp->prefix_len != 64))
3827 return -EINVAL;
3828
4bed72e4
YH		 3829 timeout = addrconf_timeout_fixup(valid_lft, HZ);
3830 if (addrconf_finite_timeout(timeout)) {
3831 expires = jiffies_to_clock_t(timeout * HZ);
3832 valid_lft = timeout;
6f704992 3833 flags = RTF_EXPIRES;
4bed72e4
YH		 3834 } else {
3835 expires = 0;
3836 flags = 0;
3837 ifa_flags |= IFA_F_PERMANENT;
6f704992 3838 }
081bba5b 3839
4bed72e4
YH		 3840 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
3841 if (addrconf_finite_timeout(timeout)) {
3842 if (timeout == 0)
3843 ifa_flags |= IFA_F_DEPRECATED;
3844 prefered_lft = timeout;
3845 }
081bba5b
NT		 3846
3847 spin_lock_bh(&ifp->lock);
53bd6749 3848 was_managetempaddr = ifp->flags & IFA_F_MANAGETEMPADDR;
5b84efec
TH		 3849 had_prefixroute = ifp->flags & IFA_F_PERMANENT &&
3850 !(ifp->flags & IFA_F_NOPREFIXROUTE);
53bd6749 3851 ifp->flags &= ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD |
761aac73
TH		 3852 IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
3853 IFA_F_NOPREFIXROUTE);
53bd6749 3854 ifp->flags |= ifa_flags;
081bba5b
NT		 3855 ifp->tstamp = jiffies;
3856 ifp->valid_lft = valid_lft;
3857 ifp->prefered_lft = prefered_lft;
3858
3859 spin_unlock_bh(&ifp->lock);
3860 if (!(ifp->flags&IFA_F_TENTATIVE))
3861 ipv6_ifa_notify(0, ifp);
081bba5b 3862
761aac73
TH		 3863 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) {
3864 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
3865 expires, flags);
5b84efec
TH		 3866 } else if (had_prefixroute) {
3867 enum cleanup_prefix_rt_t action;
3868 unsigned long rt_expires;
3869
3870 write_lock_bh(&ifp->idev->lock);
3871 action = check_cleanup_prefix_route(ifp, &rt_expires);
3872 write_unlock_bh(&ifp->idev->lock);
3873
3874 if (action != CLEANUP_PREFIX_RT_NOP) {
3875 cleanup_prefix_route(ifp, rt_expires,
3876 action == CLEANUP_PREFIX_RT_DEL);
3877 }
761aac73 3878 }
53bd6749
JP		 3879
3880 if (was_managetempaddr || ifp->flags & IFA_F_MANAGETEMPADDR) {
3881 if (was_managetempaddr && !(ifp->flags & IFA_F_MANAGETEMPADDR))
3882 valid_lft = prefered_lft = 0;
3883 manage_tempaddrs(ifp->idev, ifp, valid_lft, prefered_lft,
3884 !was_managetempaddr, jiffies);
3885 }
3886
c15b1cca 3887 addrconf_verify_rtnl();
081bba5b
NT		 3888
3889 return 0;
3890}
3891
1da177e4 3892static int
661d2967 3893inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh)
1da177e4 3894{
3b1e0a65 3895 struct net *net = sock_net(skb->sk);
461d8837
TG		 3896 struct ifaddrmsg *ifm;
3897 struct nlattr *tb[IFA_MAX+1];
caeaba79 3898 struct in6_addr *pfx, *peer_pfx;
7198f8ce
TG		 3899 struct inet6_ifaddr *ifa;
3900 struct net_device *dev;
55ebaef1 3901 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
479840ff 3902 u32 ifa_flags;
461d8837 3903 int err;
1da177e4 3904
461d8837
TG		 3905 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3906 if (err < 0)
3907 return err;
3908
3909 ifm = nlmsg_data(nlh);
caeaba79 3910 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
1da177e4
LT		 3911 if (pfx == NULL)
3912 return -EINVAL;
3913
461d8837 3914 if (tb[IFA_CACHEINFO]) {
0778769d 3915 struct ifa_cacheinfo *ci;
461d8837
TG		 3916
3917 ci = nla_data(tb[IFA_CACHEINFO]);
0778769d 3918 valid_lft = ci->ifa_valid;
461d8837
TG		 3919 preferred_lft = ci->ifa_prefered;
3920 } else {
3921 preferred_lft = INFINITY_LIFE_TIME;
3922 valid_lft = INFINITY_LIFE_TIME;
0778769d
NT		 3923 }
3924
af284937 3925 dev = __dev_get_by_index(net, ifm->ifa_index);
7198f8ce
TG		 3926 if (dev == NULL)
3927 return -ENODEV;
3928
479840ff
JP		 3929 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
3930
55ebaef1 3931 /* We ignore other flags so far. */
761aac73
TH		 3932 ifa_flags &= IFA_F_NODAD | IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
3933 IFA_F_NOPREFIXROUTE;
55ebaef1 3934
1cab3da6 3935 ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
7198f8ce
TG		 3936 if (ifa == NULL) {
3937 /*
3938 * It would be best to check for !NLM_F_CREATE here but
db9c7c39 3939 * userspace already relies on not having to provide this.
7198f8ce 3940 */
caeaba79 3941 return inet6_addr_add(net, ifm->ifa_index, pfx, peer_pfx,
af284937
DL		 3942 ifm->ifa_prefixlen, ifa_flags,
3943 preferred_lft, valid_lft);
081bba5b
NT		 3944 }
3945
7198f8ce
TG		 3946 if (nlh->nlmsg_flags & NLM_F_EXCL ||
3947 !(nlh->nlmsg_flags & NLM_F_REPLACE))
3948 err = -EEXIST;
3949 else
55ebaef1 3950 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
7198f8ce
TG		 3951
3952 in6_ifa_put(ifa);
3953
3954 return err;
1da177e4
LT		 3955}
3956
479840ff 3957static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u32 flags,
101bb229
TG		 3958 u8 scope, int ifindex)
3959{
3960 struct ifaddrmsg *ifm;
3961
3962 ifm = nlmsg_data(nlh);
3963 ifm->ifa_family = AF_INET6;
3964 ifm->ifa_prefixlen = prefixlen;
3965 ifm->ifa_flags = flags;
3966 ifm->ifa_scope = scope;
3967 ifm->ifa_index = ifindex;
3968}
3969
85486af0
TG		 3970static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
3971 unsigned long tstamp, u32 preferred, u32 valid)
3972{
3973 struct ifa_cacheinfo ci;
3974
18a31e1e
TG		 3975 ci.cstamp = cstamp_delta(cstamp);
3976 ci.tstamp = cstamp_delta(tstamp);
85486af0
TG		 3977 ci.ifa_prefered = preferred;
3978 ci.ifa_valid = valid;
3979
3980 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
3981}
3982
101bb229
TG		 3983static inline int rt_scope(int ifa_scope)
3984{
3985 if (ifa_scope & IFA_HOST)
3986 return RT_SCOPE_HOST;
3987 else if (ifa_scope & IFA_LINK)
3988 return RT_SCOPE_LINK;
3989 else if (ifa_scope & IFA_SITE)
3990 return RT_SCOPE_SITE;
3991 else
3992 return RT_SCOPE_UNIVERSE;
3993}
3994
0ab6803b
TG		 3995static inline int inet6_ifaddr_msgsize(void)
3996{
339bf98f 3997 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
caeaba79 3998 + nla_total_size(16) /* IFA_LOCAL */
339bf98f 3999 + nla_total_size(16) /* IFA_ADDRESS */
479840ff
JP		 4000 + nla_total_size(sizeof(struct ifa_cacheinfo))
4001 + nla_total_size(4) /* IFA_FLAGS */;
0ab6803b 4002}
c5396a31 4003
1da177e4 4004static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
15e47304 4005 u32 portid, u32 seq, int event, unsigned int flags)
1da177e4 4006{
1da177e4 4007 struct nlmsghdr *nlh;
85486af0 4008 u32 preferred, valid;
1da177e4 4009
15e47304 4010 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
0ab6803b 4011 if (nlh == NULL)
26932566 4012 return -EMSGSIZE;
0ab6803b 4013
101bb229
TG		 4014 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
4015 ifa->idev->dev->ifindex);
4016
fad8da3e
YA		 4017 if (!((ifa->flags&IFA_F_PERMANENT) &&
4018 (ifa->prefered_lft == INFINITY_LIFE_TIME))) {
85486af0
TG		 4019 preferred = ifa->prefered_lft;
4020 valid = ifa->valid_lft;
4021 if (preferred != INFINITY_LIFE_TIME) {
1da177e4 4022 long tval = (jiffies - ifa->tstamp)/HZ;
a1faa698
JR		 4023 if (preferred > tval)
4024 preferred -= tval;
4025 else
4026 preferred = 0;
f56619fc
BH		 4027 if (valid != INFINITY_LIFE_TIME) {
4028 if (valid > tval)
4029 valid -= tval;
4030 else
4031 valid = 0;
4032 }
1da177e4
LT		 4033 }
4034 } else {
85486af0
TG		 4035 preferred = INFINITY_LIFE_TIME;
4036 valid = INFINITY_LIFE_TIME;
4037 }
4038
7996c799 4039 if (!ipv6_addr_any(&ifa->peer_addr)) {
caeaba79
ND		 4040 if (nla_put(skb, IFA_LOCAL, 16, &ifa->addr) < 0 ||
4041 nla_put(skb, IFA_ADDRESS, 16, &ifa->peer_addr) < 0)
4042 goto error;
4043 } else
4044 if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0)
4045 goto error;
4046
4047 if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0)
4048 goto error;
1da177e4 4049
479840ff
JP		 4050 if (nla_put_u32(skb, IFA_FLAGS, ifa->flags) < 0)
4051 goto error;
4052
053c095a
JB		 4053 nlmsg_end(skb, nlh);
4054 return 0;
caeaba79
ND		 4055
4056error:
4057 nlmsg_cancel(skb, nlh);
4058 return -EMSGSIZE;
1da177e4
LT		 4059}
4060
4061static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
15e47304 4062 u32 portid, u32 seq, int event, u16 flags)
1da177e4 4063{
1da177e4 4064 struct nlmsghdr *nlh;
101bb229
TG		 4065 u8 scope = RT_SCOPE_UNIVERSE;
4066 int ifindex = ifmca->idev->dev->ifindex;
4067
4068 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
4069 scope = RT_SCOPE_SITE;
1da177e4 4070
15e47304 4071 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
0ab6803b 4072 if (nlh == NULL)
26932566 4073 return -EMSGSIZE;
85486af0 4074
0ab6803b
TG		 4075 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
4076 if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 ||
4077 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
26932566
PM		 4078 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
4079 nlmsg_cancel(skb, nlh);
4080 return -EMSGSIZE;
4081 }
85486af0 4082
053c095a
JB		 4083 nlmsg_end(skb, nlh);
4084 return 0;
1da177e4
LT		 4085}
4086
4087static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
15e47304 4088 u32 portid, u32 seq, int event, unsigned int flags)
1da177e4 4089{
1da177e4 4090 struct nlmsghdr *nlh;
101bb229
TG		 4091 u8 scope = RT_SCOPE_UNIVERSE;
4092 int ifindex = ifaca->aca_idev->dev->ifindex;
4093
4094 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
4095 scope = RT_SCOPE_SITE;
1da177e4 4096
15e47304 4097 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
0ab6803b 4098 if (nlh == NULL)
26932566 4099 return -EMSGSIZE;
85486af0 4100
0ab6803b
TG		 4101 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
4102 if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 ||
4103 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
26932566
PM		 4104 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
4105 nlmsg_cancel(skb, nlh);
4106 return -EMSGSIZE;
4107 }
1da177e4 4108
053c095a
JB		 4109 nlmsg_end(skb, nlh);
4110 return 0;
1da177e4
LT		 4111}
4112
e21e8467 4113enum addr_type_t {
1da177e4
LT		 4114 UNICAST_ADDR,
4115 MULTICAST_ADDR,
4116 ANYCAST_ADDR,
4117};
4118
234b27c3
ED		 4119/* called with rcu_read_lock() */
4120static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
4121 struct netlink_callback *cb, enum addr_type_t type,
4122 int s_ip_idx, int *p_ip_idx)
4123{
234b27c3
ED		 4124 struct ifmcaddr6 *ifmca;
4125 struct ifacaddr6 *ifaca;
4126 int err = 1;
4127 int ip_idx = *p_ip_idx;
4128
4129 read_lock_bh(&idev->lock);
4130 switch (type) {
502a2ffd 4131 case UNICAST_ADDR: {
4132 struct inet6_ifaddr *ifa;
4133
234b27c3 4134 /* unicast address incl. temp addr */
502a2ffd 4135 list_for_each_entry(ifa, &idev->addr_list, if_list) {
4136 if (++ip_idx < s_ip_idx)
234b27c3
ED		 4137 continue;
4138 err = inet6_fill_ifaddr(skb, ifa,
15e47304 4139 NETLINK_CB(cb->skb).portid,
234b27c3
ED		 4140 cb->nlh->nlmsg_seq,
4141 RTM_NEWADDR,
4142 NLM_F_MULTI);
053c095a 4143 if (err < 0)
234b27c3 4144 break;
63998ac2 4145 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
234b27c3
ED		 4146 }
4147 break;
502a2ffd 4148 }
234b27c3
ED		 4149 case MULTICAST_ADDR:
4150 /* multicast address */
4151 for (ifmca = idev->mc_list; ifmca;
4152 ifmca = ifmca->next, ip_idx++) {
4153 if (ip_idx < s_ip_idx)
4154 continue;
4155 err = inet6_fill_ifmcaddr(skb, ifmca,
15e47304 4156 NETLINK_CB(cb->skb).portid,
234b27c3
ED		 4157 cb->nlh->nlmsg_seq,
4158 RTM_GETMULTICAST,
4159 NLM_F_MULTI);
053c095a 4160 if (err < 0)
234b27c3
ED		 4161 break;
4162 }
4163 break;
4164 case ANYCAST_ADDR:
4165 /* anycast address */
4166 for (ifaca = idev->ac_list; ifaca;
4167 ifaca = ifaca->aca_next, ip_idx++) {
4168 if (ip_idx < s_ip_idx)
4169 continue;
4170 err = inet6_fill_ifacaddr(skb, ifaca,
15e47304 4171 NETLINK_CB(cb->skb).portid,
234b27c3
ED		 4172 cb->nlh->nlmsg_seq,
4173 RTM_GETANYCAST,
4174 NLM_F_MULTI);
053c095a 4175 if (err < 0)
234b27c3
ED		 4176 break;
4177 }
4178 break;
4179 default:
4180 break;
4181 }
4182 read_unlock_bh(&idev->lock);
4183 *p_ip_idx = ip_idx;
4184 return err;
4185}
4186
1da177e4
LT		 4187static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
4188 enum addr_type_t type)
4189{
234b27c3
ED		 4190 struct net *net = sock_net(skb->sk);
4191 int h, s_h;
1da177e4
LT		 4192 int idx, ip_idx;
4193 int s_idx, s_ip_idx;
1da177e4 4194 struct net_device *dev;
234b27c3
ED		 4195 struct inet6_dev *idev;
4196 struct hlist_head *head;
1ab1457c 4197
234b27c3
ED		 4198 s_h = cb->args[0];
4199 s_idx = idx = cb->args[1];
4200 s_ip_idx = ip_idx = cb->args[2];
5d5619b4 4201
234b27c3 4202 rcu_read_lock();
63998ac2 4203 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ net->dev_base_seq;
234b27c3
ED		 4204 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4205 idx = 0;
4206 head = &net->dev_index_head[h];
b67bfe0d 4207 hlist_for_each_entry_rcu(dev, head, index_hlist) {
234b27c3
ED		 4208 if (idx < s_idx)
4209 goto cont;
4b97efdf 4210 if (h > s_h || idx > s_idx)
234b27c3
ED		 4211 s_ip_idx = 0;
4212 ip_idx = 0;
e21e8467
SH		 4213 idev = __in6_dev_get(dev);
4214 if (!idev)
234b27c3
ED		 4215 goto cont;
4216
4217 if (in6_dump_addrs(idev, skb, cb, type,
7b46a644 4218 s_ip_idx, &ip_idx) < 0)
234b27c3 4219 goto done;
7562f876 4220cont:
234b27c3
ED		 4221 idx++;
4222 }
1da177e4 4223 }
234b27c3
ED		 4224done:
4225 rcu_read_unlock();
4226 cb->args[0] = h;
4227 cb->args[1] = idx;
4228 cb->args[2] = ip_idx;
4229
1da177e4
LT		 4230 return skb->len;
4231}
4232
4233static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
4234{
4235 enum addr_type_t type = UNICAST_ADDR;
b854272b 4236
1da177e4
LT		 4237 return inet6_dump_addr(skb, cb, type);
4238}
4239
4240static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
4241{
4242 enum addr_type_t type = MULTICAST_ADDR;
b854272b 4243
1da177e4
LT		 4244 return inet6_dump_addr(skb, cb, type);
4245}
4246
4247
4248static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
4249{
4250 enum addr_type_t type = ANYCAST_ADDR;
b854272b 4251
1da177e4
LT		 4252 return inet6_dump_addr(skb, cb, type);
4253}
4254
661d2967 4255static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh)
6c223828 4256{
3b1e0a65 4257 struct net *net = sock_net(in_skb->sk);
1b29fc2c
TG		 4258 struct ifaddrmsg *ifm;
4259 struct nlattr *tb[IFA_MAX+1];
caeaba79 4260 struct in6_addr *addr = NULL, *peer;
6c223828
NT		 4261 struct net_device *dev = NULL;
4262 struct inet6_ifaddr *ifa;
4263 struct sk_buff *skb;
6c223828
NT		 4264 int err;
4265
1b29fc2c
TG		 4266 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
4267 if (err < 0)
4268 goto errout;
4269
caeaba79 4270 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer);
1b29fc2c
TG		 4271 if (addr == NULL) {
4272 err = -EINVAL;
4273 goto errout;
6c223828 4274 }
6c223828 4275
1b29fc2c 4276 ifm = nlmsg_data(nlh);
6c223828 4277 if (ifm->ifa_index)
6fda7350 4278 dev = __dev_get_by_index(net, ifm->ifa_index);
6c223828 4279
e21e8467
SH		 4280 ifa = ipv6_get_ifaddr(net, addr, dev, 1);
4281 if (!ifa) {
1b29fc2c
TG		 4282 err = -EADDRNOTAVAIL;
4283 goto errout;
4284 }
6c223828 4285
e21e8467
SH		 4286 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
4287 if (!skb) {
6c223828 4288 err = -ENOBUFS;
1b29fc2c 4289 goto errout_ifa;
6c223828
NT		 4290 }
4291
15e47304 4292 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).portid,
6c223828 4293 nlh->nlmsg_seq, RTM_NEWADDR, 0);
26932566
PM		 4294 if (err < 0) {
4295 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4296 WARN_ON(err == -EMSGSIZE);
4297 kfree_skb(skb);
4298 goto errout_ifa;
4299 }
15e47304 4300 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
1b29fc2c 4301errout_ifa:
6c223828 4302 in6_ifa_put(ifa);
1b29fc2c 4303errout:
6c223828 4304 return err;
6c223828
NT		 4305}
4306
1da177e4
LT		 4307static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
4308{
4309 struct sk_buff *skb;
c346dca1 4310 struct net *net = dev_net(ifa->idev->dev);
5d620266 4311 int err = -ENOBUFS;
1da177e4 4312
0ab6803b 4313 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
5d620266
TG		 4314 if (skb == NULL)
4315 goto errout;
4316
4317 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
26932566
PM		 4318 if (err < 0) {
4319 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4320 WARN_ON(err == -EMSGSIZE);
4321 kfree_skb(skb);
4322 goto errout;
4323 }
1ce85fe4
PNA		 4324 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
4325 return;
5d620266
TG		 4326errout:
4327 if (err < 0)
6fda7350 4328 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
1da177e4
LT		 4329}
4330
b6f99a21 4331static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
1da177e4
LT		 4332 __s32 *array, int bytes)
4333{
04561c1f
TG		 4334 BUG_ON(bytes < (DEVCONF_MAX * 4));
4335
1da177e4
LT		 4336 memset(array, 0, bytes);
4337 array[DEVCONF_FORWARDING] = cnf->forwarding;
4338 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
4339 array[DEVCONF_MTU6] = cnf->mtu6;
4340 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
4341 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
4342 array[DEVCONF_AUTOCONF] = cnf->autoconf;
4343 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
4344 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
93908d19
TG		 4345 array[DEVCONF_RTR_SOLICIT_INTERVAL] =
4346 jiffies_to_msecs(cnf->rtr_solicit_interval);
4347 array[DEVCONF_RTR_SOLICIT_DELAY] =
4348 jiffies_to_msecs(cnf->rtr_solicit_delay);
1da177e4 4349 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
fc4eba58
HFS		 4350 array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] =
4351 jiffies_to_msecs(cnf->mldv1_unsolicited_report_interval);
4352 array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] =
4353 jiffies_to_msecs(cnf->mldv2_unsolicited_report_interval);
1da177e4
LT		 4354 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
4355 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
4356 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
4357 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
4358 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
1da177e4 4359 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
65f5c7c1 4360 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
c4fd30eb 4361 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
930d6ff2
YH		 4362#ifdef CONFIG_IPV6_ROUTER_PREF
4363 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
93908d19
TG		 4364 array[DEVCONF_RTR_PROBE_INTERVAL] =
4365 jiffies_to_msecs(cnf->rtr_probe_interval);
fa03ef38 4366#ifdef CONFIG_IPV6_ROUTE_INFO
09c884d4
YH		 4367 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
4368#endif
930d6ff2 4369#endif
fbea49e1 4370 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
0bcbc926 4371 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
95c385b4
NH		 4372#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4373 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
7fd2561e 4374 array[DEVCONF_USE_OPTIMISTIC] = cnf->use_optimistic;
95c385b4 4375#endif
7bc570c8
YH		 4376#ifdef CONFIG_IPV6_MROUTE
4377 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
4378#endif
778d80be 4379 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
1b34be74 4380 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
c3faca05 4381 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
5cb04436 4382 array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify;
b800c3b9 4383 array[DEVCONF_SUPPRESS_FRAG_NDISC] = cnf->suppress_frag_ndisc;
d9333196 4384 array[DEVCONF_ACCEPT_RA_FROM_LOCAL] = cnf->accept_ra_from_local;
c2943f14 4385 array[DEVCONF_ACCEPT_RA_MTU] = cnf->accept_ra_mtu;
1da177e4
LT		 4386}
4387
b382b191
TG		 4388static inline size_t inet6_ifla6_size(void)
4389{
4390 return nla_total_size(4) /* IFLA_INET6_FLAGS */
4391 + nla_total_size(sizeof(struct ifla_cacheinfo))
4392 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
4393 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
f53adae4
DB		 4394 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
4395 + nla_total_size(sizeof(struct in6_addr)); /* IFLA_INET6_TOKEN */
b382b191
TG		 4396}
4397
339bf98f
TG		 4398static inline size_t inet6_if_nlmsg_size(void)
4399{
4400 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
4401 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
4402 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
4403 + nla_total_size(4) /* IFLA_MTU */
4404 + nla_total_size(4) /* IFLA_LINK */
b382b191 4405 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */
339bf98f 4406}
c5396a31 4407
be281e55 4408static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib,
7d720c3e 4409 int items, int bytes)
7f7d9a6b
HX		 4410{
4411 int i;
4412 int pad = bytes - sizeof(u64) * items;
4413 BUG_ON(pad < 0);
4414
4415 /* Use put_unaligned() because stats may not be aligned for u64. */
4416 put_unaligned(items, &stats[0]);
4417 for (i = 1; i < items; i++)
be281e55 4418 put_unaligned(atomic_long_read(&mib[i]), &stats[i]);
7f7d9a6b
HX		 4419
4420 memset(&stats[items], 0, pad);
4421}
4422
698365fa 4423static inline void __snmp6_fill_stats64(u64 *stats, void __percpu *mib,
4ce3c183
ED		 4424 int items, int bytes, size_t syncpoff)
4425{
4426 int i;
4427 int pad = bytes - sizeof(u64) * items;
4428 BUG_ON(pad < 0);
4429
4430 /* Use put_unaligned() because stats may not be aligned for u64. */
4431 put_unaligned(items, &stats[0]);
4432 for (i = 1; i < items; i++)
4433 put_unaligned(snmp_fold_field64(mib, i, syncpoff), &stats[i]);
4434
4435 memset(&stats[items], 0, pad);
4436}
4437
7f7d9a6b
HX		 4438static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
4439 int bytes)
4440{
e21e8467 4441 switch (attrtype) {
7f7d9a6b 4442 case IFLA_INET6_STATS:
698365fa 4443 __snmp6_fill_stats64(stats, idev->stats.ipv6,
4ce3c183 4444 IPSTATS_MIB_MAX, bytes, offsetof(struct ipstats_mib, syncp));
7f7d9a6b
HX		 4445 break;
4446 case IFLA_INET6_ICMP6STATS:
be281e55 4447 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, ICMP6_MIB_MAX, bytes);
7f7d9a6b
HX		 4448 break;
4449 }
4450}
4451
b382b191
TG		 4452static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev)
4453{
4454 struct nlattr *nla;
4455 struct ifla_cacheinfo ci;
4456
c78679e8
DM		 4457 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags))
4458 goto nla_put_failure;
b382b191 4459 ci.max_reasm_len = IPV6_MAXPLEN;
24912420
DM		 4460 ci.tstamp = cstamp_delta(idev->tstamp);
4461 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time);
1f9248e5 4462 ci.retrans_time = jiffies_to_msecs(NEIGH_VAR(idev->nd_parms, RETRANS_TIME));
c78679e8
DM		 4463 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci))
4464 goto nla_put_failure;
b382b191
TG		 4465 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
4466 if (nla == NULL)
4467 goto nla_put_failure;
4468 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
4469
4470 /* XXX - MC not implemented */
4471
4472 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
4473 if (nla == NULL)
4474 goto nla_put_failure;
4475 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
4476
4477 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
4478 if (nla == NULL)
4479 goto nla_put_failure;
4480 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
4481
f53adae4
DB		 4482 nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr));
4483 if (nla == NULL)
4484 goto nla_put_failure;
bc91b0f0
JP		 4485
4486 if (nla_put_u8(skb, IFLA_INET6_ADDR_GEN_MODE, idev->addr_gen_mode))
4487 goto nla_put_failure;
4488
f53adae4
DB		 4489 read_lock_bh(&idev->lock);
4490 memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla));
4491 read_unlock_bh(&idev->lock);
4492
b382b191
TG		 4493 return 0;
4494
4495nla_put_failure:
4496 return -EMSGSIZE;
4497}
4498
4499static size_t inet6_get_link_af_size(const struct net_device *dev)
4500{
4501 if (!__in6_dev_get(dev))
4502 return 0;
4503
4504 return inet6_ifla6_size();
4505}
4506
4507static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev)
4508{
4509 struct inet6_dev *idev = __in6_dev_get(dev);
4510
4511 if (!idev)
4512 return -ENODATA;
4513
4514 if (inet6_fill_ifla6_attrs(skb, idev) < 0)
4515 return -EMSGSIZE;
4516
4517 return 0;
4518}
4519
f53adae4
DB		 4520static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token)
4521{
f53adae4
DB		 4522 struct inet6_ifaddr *ifp;
4523 struct net_device *dev = idev->dev;
fc403832 4524 bool update_rs = false;
dc848292 4525 struct in6_addr ll_addr;
f53adae4 4526
c15b1cca
HFS		 4527 ASSERT_RTNL();
4528
f53adae4
DB		 4529 if (token == NULL)
4530 return -EINVAL;
4531 if (ipv6_addr_any(token))
4532 return -EINVAL;
4533 if (dev->flags & (IFF_LOOPBACK | IFF_NOARP))
4534 return -EINVAL;
f53adae4
DB		 4535 if (!ipv6_accept_ra(idev))
4536 return -EINVAL;
4537 if (idev->cnf.rtr_solicits <= 0)
4538 return -EINVAL;
4539
4540 write_lock_bh(&idev->lock);
4541
4542 BUILD_BUG_ON(sizeof(token->s6_addr) != 16);
4543 memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8);
4544
4545 write_unlock_bh(&idev->lock);
4546
dc848292
HFS		 4547 if (!idev->dead && (idev->if_flags & IF_READY) &&
4548 !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE |
4549 IFA_F_OPTIMISTIC)) {
fc403832
DB		 4550
4551 /* If we're not ready, then normal ifup will take care
4552 * of this. Otherwise, we need to request our rs here.
4553 */
4554 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters);
4555 update_rs = true;
4556 }
f53adae4
DB		 4557
4558 write_lock_bh(&idev->lock);
fc403832 4559
77ecaace 4560 if (update_rs) {
fc403832 4561 idev->if_flags |= IF_RS_SENT;
77ecaace
HFS		 4562 idev->rs_probes = 1;
4563 addrconf_mod_rs_timer(idev, idev->cnf.rtr_solicit_interval);
4564 }
f53adae4
DB		 4565
4566 /* Well, that's kinda nasty ... */
4567 list_for_each_entry(ifp, &idev->addr_list, if_list) {
4568 spin_lock(&ifp->lock);
617fe29d 4569 if (ifp->tokenized) {
f53adae4
DB		 4570 ifp->valid_lft = 0;
4571 ifp->prefered_lft = 0;
4572 }
4573 spin_unlock(&ifp->lock);
4574 }
4575
4576 write_unlock_bh(&idev->lock);
b2ed64a9 4577 inet6_ifinfo_notify(RTM_NEWLINK, idev);
c15b1cca 4578 addrconf_verify_rtnl();
f53adae4
DB		 4579 return 0;
4580}
4581
4582static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla)
4583{
4584 int err = -EINVAL;
4585 struct inet6_dev *idev = __in6_dev_get(dev);
4586 struct nlattr *tb[IFLA_INET6_MAX + 1];
4587
4588 if (!idev)
4589 return -EAFNOSUPPORT;
4590
4591 if (nla_parse_nested(tb, IFLA_INET6_MAX, nla, NULL) < 0)
4592 BUG();
4593
bc91b0f0 4594 if (tb[IFLA_INET6_TOKEN]) {
f53adae4 4595 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN]));
bc91b0f0
JP		 4596 if (err)
4597 return err;
4598 }
4599
4600 if (tb[IFLA_INET6_ADDR_GEN_MODE]) {
4601 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]);
4602
4603 if (mode != IN6_ADDR_GEN_MODE_EUI64 &&
4604 mode != IN6_ADDR_GEN_MODE_NONE)
4605 return -EINVAL;
4606 idev->addr_gen_mode = mode;
4607 err = 0;
4608 }
f53adae4
DB		 4609
4610 return err;
4611}
4612
1ab1457c 4613static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
15e47304 4614 u32 portid, u32 seq, int event, unsigned int flags)
1da177e4 4615{
04561c1f 4616 struct net_device *dev = idev->dev;
04561c1f
TG		 4617 struct ifinfomsg *hdr;
4618 struct nlmsghdr *nlh;
4619 void *protoinfo;
04561c1f 4620
15e47304 4621 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags);
04561c1f 4622 if (nlh == NULL)
26932566 4623 return -EMSGSIZE;
04561c1f
TG		 4624
4625 hdr = nlmsg_data(nlh);
4626 hdr->ifi_family = AF_INET6;
4627 hdr->__ifi_pad = 0;
4628 hdr->ifi_type = dev->type;
4629 hdr->ifi_index = dev->ifindex;
4630 hdr->ifi_flags = dev_get_flags(dev);
4631 hdr->ifi_change = 0;
4632
c78679e8
DM		 4633 if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
4634 (dev->addr_len &&
4635 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
4636 nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
4637 (dev->ifindex != dev->iflink &&
4638 nla_put_u32(skb, IFLA_LINK, dev->iflink)))
4639 goto nla_put_failure;
04561c1f
TG		 4640 protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
4641 if (protoinfo == NULL)
4642 goto nla_put_failure;
1da177e4 4643
b382b191 4644 if (inet6_fill_ifla6_attrs(skb, idev) < 0)
bf99f1bd 4645 goto nla_put_failure;
1da177e4 4646
04561c1f 4647 nla_nest_end(skb, protoinfo);
053c095a
JB		 4648 nlmsg_end(skb, nlh);
4649 return 0;
1da177e4 4650
04561c1f 4651nla_put_failure:
26932566
PM		 4652 nlmsg_cancel(skb, nlh);
4653 return -EMSGSIZE;
1da177e4
LT		 4654}
4655
4656static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
4657{
3b1e0a65 4658 struct net *net = sock_net(skb->sk);
84d2697d 4659 int h, s_h;
434a8a58 4660 int idx = 0, s_idx;
1da177e4
LT		 4661 struct net_device *dev;
4662 struct inet6_dev *idev;
84d2697d 4663 struct hlist_head *head;
1da177e4 4664
84d2697d
ED		 4665 s_h = cb->args[0];
4666 s_idx = cb->args[1];
4667
4668 rcu_read_lock();
4669 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4670 idx = 0;
4671 head = &net->dev_index_head[h];
b67bfe0d 4672 hlist_for_each_entry_rcu(dev, head, index_hlist) {
84d2697d
ED		 4673 if (idx < s_idx)
4674 goto cont;
4675 idev = __in6_dev_get(dev);
4676 if (!idev)
4677 goto cont;
4678 if (inet6_fill_ifinfo(skb, idev,
15e47304 4679 NETLINK_CB(cb->skb).portid,
84d2697d 4680 cb->nlh->nlmsg_seq,
053c095a 4681 RTM_NEWLINK, NLM_F_MULTI) < 0)
84d2697d 4682 goto out;
7562f876 4683cont:
84d2697d
ED		 4684 idx++;
4685 }
1da177e4 4686 }
84d2697d
ED		 4687out:
4688 rcu_read_unlock();
4689 cb->args[1] = idx;
4690 cb->args[0] = h;
1da177e4
LT		 4691
4692 return skb->len;
4693}
4694
4695void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
4696{
4697 struct sk_buff *skb;
c346dca1 4698 struct net *net = dev_net(idev->dev);
8d7a76c9 4699 int err = -ENOBUFS;
1ab1457c 4700
339bf98f 4701 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
8d7a76c9
TG		 4702 if (skb == NULL)
4703 goto errout;
4704
4705 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
26932566
PM		 4706 if (err < 0) {
4707 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
4708 WARN_ON(err == -EMSGSIZE);
4709 kfree_skb(skb);
4710 goto errout;
4711 }
5f75a104 4712 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC);
1ce85fe4 4713 return;
8d7a76c9
TG		 4714errout:
4715 if (err < 0)
5f75a104 4716 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err);
1da177e4
LT		 4717}
4718
339bf98f
TG		 4719static inline size_t inet6_prefix_nlmsg_size(void)
4720{
4721 return NLMSG_ALIGN(sizeof(struct prefixmsg))
4722 + nla_total_size(sizeof(struct in6_addr))
4723 + nla_total_size(sizeof(struct prefix_cacheinfo));
4724}
c5396a31 4725
1da177e4 4726static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
15e47304 4727 struct prefix_info *pinfo, u32 portid, u32 seq,
6051e2f4 4728 int event, unsigned int flags)
1da177e4 4729{
6051e2f4
TG		 4730 struct prefixmsg *pmsg;
4731 struct nlmsghdr *nlh;
1da177e4
LT		 4732 struct prefix_cacheinfo ci;
4733
15e47304 4734 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags);
6051e2f4 4735 if (nlh == NULL)
26932566 4736 return -EMSGSIZE;
6051e2f4
TG		 4737
4738 pmsg = nlmsg_data(nlh);
1da177e4 4739 pmsg->prefix_family = AF_INET6;
8a47077a
PM		 4740 pmsg->prefix_pad1 = 0;
4741 pmsg->prefix_pad2 = 0;
1da177e4
LT		 4742 pmsg->prefix_ifindex = idev->dev->ifindex;
4743 pmsg->prefix_len = pinfo->prefix_len;
4744 pmsg->prefix_type = pinfo->type;
8a47077a 4745 pmsg->prefix_pad3 = 0;
1da177e4
LT		 4746 pmsg->prefix_flags = 0;
4747 if (pinfo->onlink)
4748 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
4749 if (pinfo->autoconf)
4750 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
4751
c78679e8
DM		 4752 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix))
4753 goto nla_put_failure;
1da177e4
LT		 4754 ci.preferred_time = ntohl(pinfo->prefered);
4755 ci.valid_time = ntohl(pinfo->valid);
c78679e8
DM		 4756 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci))
4757 goto nla_put_failure;
053c095a
JB		 4758 nlmsg_end(skb, nlh);
4759 return 0;
1da177e4 4760
6051e2f4 4761nla_put_failure:
26932566
PM		 4762 nlmsg_cancel(skb, nlh);
4763 return -EMSGSIZE;
1da177e4
LT		 4764}
4765
1ab1457c 4766static void inet6_prefix_notify(int event, struct inet6_dev *idev,
1da177e4
LT		 4767 struct prefix_info *pinfo)
4768{
4769 struct sk_buff *skb;
c346dca1 4770 struct net *net = dev_net(idev->dev);
8c384bfa 4771 int err = -ENOBUFS;
1da177e4 4772
339bf98f 4773 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
8c384bfa
TG		 4774 if (skb == NULL)
4775 goto errout;
4776
4777 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
26932566
PM		 4778 if (err < 0) {
4779 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
4780 WARN_ON(err == -EMSGSIZE);
4781 kfree_skb(skb);
4782 goto errout;
4783 }
1ce85fe4
PNA		 4784 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
4785 return;
8c384bfa
TG		 4786errout:
4787 if (err < 0)
6fda7350 4788 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
1da177e4
LT		 4789}
4790
1da177e4
LT		 4791static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4792{
63998ac2
ND		 4793 struct net *net = dev_net(ifp->idev->dev);
4794
c15b1cca
HFS		 4795 if (event)
4796 ASSERT_RTNL();
4797
1da177e4
LT		 4798 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
4799
4800 switch (event) {
4801 case RTM_NEWADDR:
95c385b4
NH		 4802 /*
4803 * If the address was optimistic
4804 * we inserted the route at the start of
4805 * our DAD process, so we don't need
4806 * to do it again
4807 */
4808 if (!(ifp->rt->rt6i_node))
4809 ip6_ins_rt(ifp->rt);
1da177e4
LT		 4810 if (ifp->idev->cnf.forwarding)
4811 addrconf_join_anycast(ifp);
7996c799 4812 if (!ipv6_addr_any(&ifp->peer_addr))
caeaba79
ND		 4813 addrconf_prefix_route(&ifp->peer_addr, 128,
4814 ifp->idev->dev, 0, 0);
1da177e4
LT		 4815 break;
4816 case RTM_DELADDR:
4817 if (ifp->idev->cnf.forwarding)
4818 addrconf_leave_anycast(ifp);
4819 addrconf_leave_solict(ifp->idev, &ifp->addr);
7996c799 4820 if (!ipv6_addr_any(&ifp->peer_addr)) {
caeaba79 4821 struct rt6_info *rt;
caeaba79 4822
e7478dfc
ND		 4823 rt = addrconf_get_prefix_route(&ifp->peer_addr, 128,
4824 ifp->idev->dev, 0, 0);
f24062b0
ND		 4825 if (rt && ip6_del_rt(rt))
4826 dst_free(&rt->dst);
caeaba79 4827 }
d8d1f30b 4828 dst_hold(&ifp->rt->dst);
93fa159a 4829
73a8bd74 4830 if (ip6_del_rt(ifp->rt))
d8d1f30b 4831 dst_free(&ifp->rt->dst);
705f1c86
HFS		 4832
4833 rt_genid_bump_ipv6(net);
1da177e4
LT		 4834 break;
4835 }
63998ac2 4836 atomic_inc(&net->ipv6.dev_addr_genid);
1da177e4
LT		 4837}
4838
4839static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4840{
8814c4b5 4841 rcu_read_lock_bh();
1da177e4
LT		 4842 if (likely(ifp->idev->dead == 0))
4843 __ipv6_ifa_notify(event, ifp);
8814c4b5 4844 rcu_read_unlock_bh();
1da177e4
LT		 4845}
4846
4847#ifdef CONFIG_SYSCTL
4848
4849static
fe2c6338 4850int addrconf_sysctl_forward(struct ctl_table *ctl, int write,
1da177e4
LT		 4851 void __user *buffer, size_t *lenp, loff_t *ppos)
4852{
4853 int *valp = ctl->data;
4854 int val = *valp;
88af182e 4855 loff_t pos = *ppos;
fe2c6338 4856 struct ctl_table lctl;
1da177e4
LT		 4857 int ret;
4858
013d97e9
FR		 4859 /*
4860 * ctl->data points to idev->cnf.forwarding, we should
4861 * not modify it until we get the rtnl lock.
4862 */
4863 lctl = *ctl;
4864 lctl.data = &val;
4865
4866 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
1da177e4 4867
c8fecf22 4868 if (write)
b325fddb 4869 ret = addrconf_fixup_forwarding(ctl, valp, val);
88af182e
EB		 4870 if (ret)
4871 *ppos = pos;
1ab1457c 4872 return ret;
1da177e4
LT		 4873}
4874
56d417b1
BH		 4875static void dev_disable_change(struct inet6_dev *idev)
4876{
75538c2b
CW		 4877 struct netdev_notifier_info info;
4878
56d417b1
BH		 4879 if (!idev || !idev->dev)
4880 return;
4881
75538c2b 4882 netdev_notifier_info_init(&info, idev->dev);
56d417b1 4883 if (idev->cnf.disable_ipv6)
75538c2b 4884 addrconf_notify(NULL, NETDEV_DOWN, &info);
56d417b1 4885 else
75538c2b 4886 addrconf_notify(NULL, NETDEV_UP, &info);
56d417b1
BH		 4887}
4888
4889static void addrconf_disable_change(struct net *net, __s32 newf)
4890{
4891 struct net_device *dev;
4892 struct inet6_dev *idev;
4893
c6d14c84
ED		 4894 rcu_read_lock();
4895 for_each_netdev_rcu(net, dev) {
56d417b1
BH		 4896 idev = __in6_dev_get(dev);
4897 if (idev) {
4898 int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
4899 idev->cnf.disable_ipv6 = newf;
4900 if (changed)
4901 dev_disable_change(idev);
4902 }
56d417b1 4903 }
c6d14c84 4904 rcu_read_unlock();
56d417b1
BH		 4905}
4906
013d97e9 4907static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf)
56d417b1
BH		 4908{
4909 struct net *net;
013d97e9
FR		 4910 int old;
4911
4912 if (!rtnl_trylock())
4913 return restart_syscall();
56d417b1
BH		 4914
4915 net = (struct net *)table->extra2;
013d97e9
FR		 4916 old = *p;
4917 *p = newf;
56d417b1 4918
013d97e9
FR		 4919 if (p == &net->ipv6.devconf_dflt->disable_ipv6) {
4920 rtnl_unlock();
56d417b1 4921 return 0;
88af182e 4922 }
56d417b1
BH		 4923
4924 if (p == &net->ipv6.devconf_all->disable_ipv6) {
56d417b1
BH		 4925 net->ipv6.devconf_dflt->disable_ipv6 = newf;
4926 addrconf_disable_change(net, newf);
013d97e9 4927 } else if ((!newf) ^ (!old))
56d417b1
BH		 4928 dev_disable_change((struct inet6_dev *)table->extra1);
4929
4930 rtnl_unlock();
4931 return 0;
4932}
4933
4934static
fe2c6338 4935int addrconf_sysctl_disable(struct ctl_table *ctl, int write,
56d417b1
BH		 4936 void __user *buffer, size_t *lenp, loff_t *ppos)
4937{
4938 int *valp = ctl->data;
4939 int val = *valp;
88af182e 4940 loff_t pos = *ppos;
fe2c6338 4941 struct ctl_table lctl;
56d417b1
BH		 4942 int ret;
4943
013d97e9
FR		 4944 /*
4945 * ctl->data points to idev->cnf.disable_ipv6, we should
4946 * not modify it until we get the rtnl lock.
4947 */
4948 lctl = *ctl;
4949 lctl.data = &val;
4950
4951 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
56d417b1
BH		 4952
4953 if (write)
4954 ret = addrconf_disable_ipv6(ctl, valp, val);
88af182e
EB		 4955 if (ret)
4956 *ppos = pos;
56d417b1
BH		 4957 return ret;
4958}
4959
c92d5491 4960static
4961int addrconf_sysctl_proxy_ndp(struct ctl_table *ctl, int write,
4962 void __user *buffer, size_t *lenp, loff_t *ppos)
4963{
4964 int *valp = ctl->data;
4965 int ret;
4966 int old, new;
4967
4968 old = *valp;
4969 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
4970 new = *valp;
4971
4972 if (write && old != new) {
4973 struct net *net = ctl->extra2;
4974
4975 if (!rtnl_trylock())
4976 return restart_syscall();
4977
4978 if (valp == &net->ipv6.devconf_dflt->proxy_ndp)
4979 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
4980 NETCONFA_IFINDEX_DEFAULT,
4981 net->ipv6.devconf_dflt);
4982 else if (valp == &net->ipv6.devconf_all->proxy_ndp)
4983 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
4984 NETCONFA_IFINDEX_ALL,
4985 net->ipv6.devconf_all);
4986 else {
4987 struct inet6_dev *idev = ctl->extra1;
4988
4989 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
4990 idev->dev->ifindex,
4991 &idev->cnf);
4992 }
4993 rtnl_unlock();
4994 }
4995
4996 return ret;
4997}
4998
4999
1da177e4
LT		 5000static struct addrconf_sysctl_table
5001{
5002 struct ctl_table_header *sysctl_header;
fe2c6338 5003 struct ctl_table addrconf_vars[DEVCONF_MAX+1];
ab32ea5d 5004} addrconf_sysctl __read_mostly = {
1da177e4
LT		 5005 .sysctl_header = NULL,
5006 .addrconf_vars = {
1ab1457c 5007 {
e21e8467
SH		 5008 .procname = "forwarding",
5009 .data = &ipv6_devconf.forwarding,
5010 .maxlen = sizeof(int),
5011 .mode = 0644,
5012 .proc_handler = addrconf_sysctl_forward,
1da177e4
LT		 5013 },
5014 {
e21e8467
SH		 5015 .procname = "hop_limit",
5016 .data = &ipv6_devconf.hop_limit,
5017 .maxlen = sizeof(int),
5018 .mode = 0644,
5019 .proc_handler = proc_dointvec,
1da177e4
LT		 5020 },
5021 {
e21e8467
SH		 5022 .procname = "mtu",
5023 .data = &ipv6_devconf.mtu6,
5024 .maxlen = sizeof(int),
5025 .mode = 0644,
5026 .proc_handler = proc_dointvec,
1da177e4
LT		 5027 },
5028 {
e21e8467
SH		 5029 .procname = "accept_ra",
5030 .data = &ipv6_devconf.accept_ra,
5031 .maxlen = sizeof(int),
5032 .mode = 0644,
5033 .proc_handler = proc_dointvec,
1da177e4
LT		 5034 },
5035 {
e21e8467
SH		 5036 .procname = "accept_redirects",
5037 .data = &ipv6_devconf.accept_redirects,
5038 .maxlen = sizeof(int),
5039 .mode = 0644,
5040 .proc_handler = proc_dointvec,
1da177e4
LT		 5041 },
5042 {
e21e8467
SH		 5043 .procname = "autoconf",
5044 .data = &ipv6_devconf.autoconf,
5045 .maxlen = sizeof(int),
5046 .mode = 0644,
5047 .proc_handler = proc_dointvec,
1da177e4
LT		 5048 },
5049 {
e21e8467
SH		 5050 .procname = "dad_transmits",
5051 .data = &ipv6_devconf.dad_transmits,
5052 .maxlen = sizeof(int),
5053 .mode = 0644,
5054 .proc_handler = proc_dointvec,
1da177e4
LT		 5055 },
5056 {
e21e8467
SH		 5057 .procname = "router_solicitations",
5058 .data = &ipv6_devconf.rtr_solicits,
5059 .maxlen = sizeof(int),
5060 .mode = 0644,
5061 .proc_handler = proc_dointvec,
1da177e4
LT		 5062 },
5063 {
e21e8467
SH		 5064 .procname = "router_solicitation_interval",
5065 .data = &ipv6_devconf.rtr_solicit_interval,
5066 .maxlen = sizeof(int),
5067 .mode = 0644,
5068 .proc_handler = proc_dointvec_jiffies,
1da177e4
LT		 5069 },
5070 {
e21e8467
SH		 5071 .procname = "router_solicitation_delay",
5072 .data = &ipv6_devconf.rtr_solicit_delay,
5073 .maxlen = sizeof(int),
5074 .mode = 0644,
5075 .proc_handler = proc_dointvec_jiffies,
1da177e4
LT		 5076 },
5077 {
e21e8467
SH		 5078 .procname = "force_mld_version",
5079 .data = &ipv6_devconf.force_mld_version,
5080 .maxlen = sizeof(int),
5081 .mode = 0644,
5082 .proc_handler = proc_dointvec,
1da177e4 5083 },
fc4eba58
HFS		 5084 {
5085 .procname = "mldv1_unsolicited_report_interval",
5086 .data =
5087 &ipv6_devconf.mldv1_unsolicited_report_interval,
5088 .maxlen = sizeof(int),
5089 .mode = 0644,
5090 .proc_handler = proc_dointvec_ms_jiffies,
5091 },
5092 {
5093 .procname = "mldv2_unsolicited_report_interval",
5094 .data =
5095 &ipv6_devconf.mldv2_unsolicited_report_interval,
5096 .maxlen = sizeof(int),
5097 .mode = 0644,
5098 .proc_handler = proc_dointvec_ms_jiffies,
5099 },
1da177e4 5100 {
e21e8467
SH		 5101 .procname = "use_tempaddr",
5102 .data = &ipv6_devconf.use_tempaddr,
5103 .maxlen = sizeof(int),
5104 .mode = 0644,
5105 .proc_handler = proc_dointvec,
1da177e4
LT		 5106 },
5107 {
e21e8467
SH		 5108 .procname = "temp_valid_lft",
5109 .data = &ipv6_devconf.temp_valid_lft,
5110 .maxlen = sizeof(int),
5111 .mode = 0644,
5112 .proc_handler = proc_dointvec,
1da177e4
LT		 5113 },
5114 {
e21e8467
SH		 5115 .procname = "temp_prefered_lft",
5116 .data = &ipv6_devconf.temp_prefered_lft,
5117 .maxlen = sizeof(int),
5118 .mode = 0644,
5119 .proc_handler = proc_dointvec,
1da177e4
LT		 5120 },
5121 {
e21e8467
SH		 5122 .procname = "regen_max_retry",
5123 .data = &ipv6_devconf.regen_max_retry,
5124 .maxlen = sizeof(int),
5125 .mode = 0644,
5126 .proc_handler = proc_dointvec,
1da177e4
LT		 5127 },
5128 {
e21e8467
SH		 5129 .procname = "max_desync_factor",
5130 .data = &ipv6_devconf.max_desync_factor,
5131 .maxlen = sizeof(int),
5132 .mode = 0644,
5133 .proc_handler = proc_dointvec,
1da177e4 5134 },
1da177e4 5135 {
e21e8467
SH		 5136 .procname = "max_addresses",
5137 .data = &ipv6_devconf.max_addresses,
5138 .maxlen = sizeof(int),
5139 .mode = 0644,
5140 .proc_handler = proc_dointvec,
1da177e4 5141 },
65f5c7c1 5142 {
e21e8467
SH		 5143 .procname = "accept_ra_defrtr",
5144 .data = &ipv6_devconf.accept_ra_defrtr,
5145 .maxlen = sizeof(int),
5146 .mode = 0644,
5147 .proc_handler = proc_dointvec,
65f5c7c1 5148 },
c4fd30eb 5149 {
e21e8467
SH		 5150 .procname = "accept_ra_pinfo",
5151 .data = &ipv6_devconf.accept_ra_pinfo,
5152 .maxlen = sizeof(int),
5153 .mode = 0644,
5154 .proc_handler = proc_dointvec,
c4fd30eb 5155 },
930d6ff2
YH		 5156#ifdef CONFIG_IPV6_ROUTER_PREF
5157 {
e21e8467
SH		 5158 .procname = "accept_ra_rtr_pref",
5159 .data = &ipv6_devconf.accept_ra_rtr_pref,
5160 .maxlen = sizeof(int),
5161 .mode = 0644,
5162 .proc_handler = proc_dointvec,
930d6ff2 5163 },
52e16356 5164 {
e21e8467
SH		 5165 .procname = "router_probe_interval",
5166 .data = &ipv6_devconf.rtr_probe_interval,
5167 .maxlen = sizeof(int),
5168 .mode = 0644,
5169 .proc_handler = proc_dointvec_jiffies,
52e16356 5170 },
fa03ef38 5171#ifdef CONFIG_IPV6_ROUTE_INFO
09c884d4 5172 {
e21e8467
SH		 5173 .procname = "accept_ra_rt_info_max_plen",
5174 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
5175 .maxlen = sizeof(int),
5176 .mode = 0644,
5177 .proc_handler = proc_dointvec,
09c884d4
YH		 5178 },
5179#endif
930d6ff2 5180#endif
fbea49e1 5181 {
e21e8467
SH		 5182 .procname = "proxy_ndp",
5183 .data = &ipv6_devconf.proxy_ndp,
5184 .maxlen = sizeof(int),
5185 .mode = 0644,
c92d5491 5186 .proc_handler = addrconf_sysctl_proxy_ndp,
fbea49e1 5187 },
0bcbc926 5188 {
e21e8467
SH		 5189 .procname = "accept_source_route",
5190 .data = &ipv6_devconf.accept_source_route,
5191 .maxlen = sizeof(int),
5192 .mode = 0644,
5193 .proc_handler = proc_dointvec,
0bcbc926 5194 },
95c385b4
NH		 5195#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
5196 {
e21e8467
SH		 5197 .procname = "optimistic_dad",
5198 .data = &ipv6_devconf.optimistic_dad,
5199 .maxlen = sizeof(int),
5200 .mode = 0644,
5201 .proc_handler = proc_dointvec,
95c385b4
NH		 5202
5203 },
7fd2561e
EK		 5204 {
5205 .procname = "use_optimistic",
5206 .data = &ipv6_devconf.use_optimistic,
5207 .maxlen = sizeof(int),
5208 .mode = 0644,
5209 .proc_handler = proc_dointvec,
5210
5211 },
7bc570c8
YH		 5212#endif
5213#ifdef CONFIG_IPV6_MROUTE
5214 {
e21e8467
SH		 5215 .procname = "mc_forwarding",
5216 .data = &ipv6_devconf.mc_forwarding,
5217 .maxlen = sizeof(int),
5218 .mode = 0444,
5219 .proc_handler = proc_dointvec,
7bc570c8 5220 },
95c385b4 5221#endif
778d80be 5222 {
e21e8467
SH		 5223 .procname = "disable_ipv6",
5224 .data = &ipv6_devconf.disable_ipv6,
5225 .maxlen = sizeof(int),
5226 .mode = 0644,
5227 .proc_handler = addrconf_sysctl_disable,
778d80be 5228 },
1b34be74 5229 {
e21e8467
SH		 5230 .procname = "accept_dad",
5231 .data = &ipv6_devconf.accept_dad,
5232 .maxlen = sizeof(int),
5233 .mode = 0644,
5234 .proc_handler = proc_dointvec,
1b34be74 5235 },
f7734fdf 5236 {
f7734fdf
OP		 5237 .procname = "force_tllao",
5238 .data = &ipv6_devconf.force_tllao,
5239 .maxlen = sizeof(int),
5240 .mode = 0644,
5241 .proc_handler = proc_dointvec
5242 },
5cb04436
HFS		 5243 {
5244 .procname = "ndisc_notify",
5245 .data = &ipv6_devconf.ndisc_notify,
5246 .maxlen = sizeof(int),
5247 .mode = 0644,
5248 .proc_handler = proc_dointvec
5249 },
b800c3b9
HFS		 5250 {
5251 .procname = "suppress_frag_ndisc",
5252 .data = &ipv6_devconf.suppress_frag_ndisc,
5253 .maxlen = sizeof(int),
5254 .mode = 0644,
5255 .proc_handler = proc_dointvec
5256 },
d9333196
BG		 5257 {
5258 .procname = "accept_ra_from_local",
5259 .data = &ipv6_devconf.accept_ra_from_local,
5260 .maxlen = sizeof(int),
5261 .mode = 0644,
5262 .proc_handler = proc_dointvec,
5263 },
c2943f14
HH		 5264 {
5265 .procname = "accept_ra_mtu",
5266 .data = &ipv6_devconf.accept_ra_mtu,
5267 .maxlen = sizeof(int),
5268 .mode = 0644,
5269 .proc_handler = proc_dointvec,
5270 },
1da177e4 5271 {
f8572d8f 5272 /* sentinel */
1da177e4
LT		 5273 }
5274 },
1da177e4
LT		 5275};
5276
bff16c2f 5277static int __addrconf_sysctl_register(struct net *net, char *dev_name,
f8572d8f 5278 struct inet6_dev *idev, struct ipv6_devconf *p)
1da177e4
LT		 5279{
5280 int i;
1da177e4 5281 struct addrconf_sysctl_table *t;
6105e293 5282 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ];
1dab6222 5283
af879cc7 5284 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
1da177e4 5285 if (t == NULL)
f68635e6
PE		 5286 goto out;
5287
bcdd553f 5288 for (i = 0; t->addrconf_vars[i].data; i++) {
e21e8467 5289 t->addrconf_vars[i].data += (char *)p - (char *)&ipv6_devconf;
1da177e4 5290 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
bff16c2f 5291 t->addrconf_vars[i].extra2 = net;
1da177e4 5292 }
1da177e4 5293
6105e293 5294 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name);
1da177e4 5295
6105e293 5296 t->sysctl_header = register_net_sysctl(net, path, t->addrconf_vars);
1da177e4 5297 if (t->sysctl_header == NULL)
6105e293 5298 goto free;
f68635e6
PE		 5299
5300 p->sysctl = t;
95897312 5301 return 0;
1da177e4 5302
f68635e6 5303free:
1da177e4 5304 kfree(t);
f68635e6 5305out:
95897312 5306 return -ENOBUFS;
1da177e4
LT		 5307}
5308
408c4768
PE		 5309static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
5310{
5311 struct addrconf_sysctl_table *t;
5312
5313 if (p->sysctl == NULL)
5314 return;
5315
5316 t = p->sysctl;
5317 p->sysctl = NULL;
ff538818 5318 unregister_net_sysctl_table(t->sysctl_header);
408c4768
PE		 5319 kfree(t);
5320}
5321
a317a2f1 5322static int addrconf_sysctl_register(struct inet6_dev *idev)
f52295a9 5323{
a317a2f1
WC		 5324 int err;
5325
5326 if (!sysctl_dev_name_is_allowed(idev->dev->name))
5327 return -EINVAL;
5328
5329 err = neigh_sysctl_register(idev->dev, idev->nd_parms,
5330 &ndisc_ifinfo_sysctl_change);
5331 if (err)
5332 return err;
5333 err = __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
5334 idev, &idev->cnf);
5335 if (err)
5336 neigh_sysctl_unregister(idev->nd_parms);
5337
5338 return err;
f52295a9
PE		 5339}
5340
408c4768 5341static void addrconf_sysctl_unregister(struct inet6_dev *idev)
1da177e4 5342{
408c4768
PE		 5343 __addrconf_sysctl_unregister(&idev->cnf);
5344 neigh_sysctl_unregister(idev->nd_parms);
1da177e4
LT		 5345}
5346
5347
5348#endif
5349
2c8c1e72 5350static int __net_init addrconf_init_net(struct net *net)
e0da5a48 5351{
a79ca223 5352 int err = -ENOMEM;
e0da5a48
PE		 5353 struct ipv6_devconf *all, *dflt;
5354
a79ca223
HZ		 5355 all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL);
5356 if (all == NULL)
5357 goto err_alloc_all;
e0da5a48 5358
a79ca223
HZ		 5359 dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
5360 if (dflt == NULL)
5361 goto err_alloc_dflt;
e0da5a48 5362
a79ca223
HZ		 5363 /* these will be inherited by all namespaces */
5364 dflt->autoconf = ipv6_defaults.autoconf;
5365 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
e0da5a48
PE		 5366
5367 net->ipv6.devconf_all = all;
5368 net->ipv6.devconf_dflt = dflt;
5369
5370#ifdef CONFIG_SYSCTL
f8572d8f 5371 err = __addrconf_sysctl_register(net, "all", NULL, all);
e0da5a48
PE		 5372 if (err < 0)
5373 goto err_reg_all;
5374
f8572d8f 5375 err = __addrconf_sysctl_register(net, "default", NULL, dflt);
e0da5a48
PE		 5376 if (err < 0)
5377 goto err_reg_dflt;
5378#endif
5379 return 0;
5380
5381#ifdef CONFIG_SYSCTL
5382err_reg_dflt:
5383 __addrconf_sysctl_unregister(all);
5384err_reg_all:
5385 kfree(dflt);
5386#endif
5387err_alloc_dflt:
5388 kfree(all);
5389err_alloc_all:
5390 return err;
5391}
5392
2c8c1e72 5393static void __net_exit addrconf_exit_net(struct net *net)
e0da5a48
PE		 5394{
5395#ifdef CONFIG_SYSCTL
5396 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
5397 __addrconf_sysctl_unregister(net->ipv6.devconf_all);
5398#endif
73cf0e92 5399 kfree(net->ipv6.devconf_dflt);
5400 kfree(net->ipv6.devconf_all);
e0da5a48
PE		 5401}
5402
5403static struct pernet_operations addrconf_ops = {
5404 .init = addrconf_init_net,
5405 .exit = addrconf_exit_net,
5406};
5407
b382b191
TG		 5408static struct rtnl_af_ops inet6_ops = {
5409 .family = AF_INET6,
5410 .fill_link_af = inet6_fill_link_af,
5411 .get_link_af_size = inet6_get_link_af_size,
f53adae4 5412 .set_link_af = inet6_set_link_af,
b382b191
TG		 5413};
5414
1da177e4
LT		 5415/*
5416 * Init / cleanup code
5417 */
5418
5419int __init addrconf_init(void)
5420{
a317a2f1 5421 struct inet6_dev *idev;
c2e21293 5422 int i, err;
2a8cc6c8 5423
e21e8467
SH		 5424 err = ipv6_addr_label_init();
5425 if (err < 0) {
f3213831
JP		 5426 pr_crit("%s: cannot initialize default policy table: %d\n",
5427 __func__, err);
2cc6d2bf 5428 goto out;
2a8cc6c8 5429 }
1da177e4 5430
2cc6d2bf
NH		 5431 err = register_pernet_subsys(&addrconf_ops);
5432 if (err < 0)
5433 goto out_addrlabel;
e0da5a48 5434
c15b1cca
HFS		 5435 addrconf_wq = create_workqueue("ipv6_addrconf");
5436 if (!addrconf_wq) {
5437 err = -ENOMEM;
5438 goto out_nowq;
5439 }
5440
1da177e4
LT		 5441 /* The addrconf netdev notifier requires that loopback_dev
5442 * has it's ipv6 private information allocated and setup
5443 * before it can bring up and give link-local addresses
5444 * to other devices which are up.
5445 *
5446 * Unfortunately, loopback_dev is not necessarily the first
5447 * entry in the global dev_base list of net devices. In fact,
5448 * it is likely to be the very last entry on that list.
5449 * So this causes the notifier registry below to try and
5450 * give link-local addresses to all devices besides loopback_dev
5451 * first, then loopback_dev, which cases all the non-loopback_dev
5452 * devices to fail to get a link-local address.
5453 *
5454 * So, as a temporary fix, allocate the ipv6 structure for
5455 * loopback_dev first by hand.
5456 * Longer term, all of the dependencies ipv6 has upon the loopback
5457 * device and it being up should be removed.
5458 */
5459 rtnl_lock();
a317a2f1 5460 idev = ipv6_add_dev(init_net.loopback_dev);
1da177e4 5461 rtnl_unlock();
a317a2f1
WC		 5462 if (IS_ERR(idev)) {
5463 err = PTR_ERR(idev);
e0da5a48 5464 goto errlo;
a317a2f1 5465 }
1da177e4 5466
c2e21293 5467 for (i = 0; i < IN6_ADDR_HSIZE; i++)
5468 INIT_HLIST_HEAD(&inet6_addr_lst[i]);
5469
1da177e4
LT		 5470 register_netdevice_notifier(&ipv6_dev_notf);
5471
c15b1cca 5472 addrconf_verify();
c127ea2c 5473
3678a9d8 5474 rtnl_af_register(&inet6_ops);
b382b191 5475
c7ac8679
GR		 5476 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo,
5477 NULL);
c127ea2c
TG		 5478 if (err < 0)
5479 goto errout;
5480
5481 /* Only the first call to __rtnl_register can fail */
c7ac8679
GR		 5482 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL, NULL);
5483 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL, NULL);
5484 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr,
5485 inet6_dump_ifaddr, NULL);
5486 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL,
5487 inet6_dump_ifmcaddr, NULL);
5488 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL,
5489 inet6_dump_ifacaddr, NULL);
76f8f6cb 5490 __rtnl_register(PF_INET6, RTM_GETNETCONF, inet6_netconf_get_devconf,
7a674200 5491 inet6_netconf_dump_devconf, NULL);
c127ea2c 5492
2a8cc6c8
YH		 5493 ipv6_addr_label_rtnl_register();
5494
1da177e4 5495 return 0;
c127ea2c 5496errout:
b382b191 5497 rtnl_af_unregister(&inet6_ops);
c127ea2c 5498 unregister_netdevice_notifier(&ipv6_dev_notf);
e0da5a48 5499errlo:
c15b1cca
HFS		 5500 destroy_workqueue(addrconf_wq);
5501out_nowq:
e0da5a48 5502 unregister_pernet_subsys(&addrconf_ops);
2cc6d2bf
NH		 5503out_addrlabel:
5504 ipv6_addr_label_cleanup();
5505out:
c127ea2c 5506 return err;
1da177e4
LT		 5507}
5508
09f7709f 5509void addrconf_cleanup(void)
1da177e4 5510{
176c39af 5511 struct net_device *dev;
1da177e4
LT		 5512 int i;
5513
5514 unregister_netdevice_notifier(&ipv6_dev_notf);
e0da5a48 5515 unregister_pernet_subsys(&addrconf_ops);
2cc6d2bf 5516 ipv6_addr_label_cleanup();
1da177e4
LT		 5517
5518 rtnl_lock();
5519
b382b191
TG		 5520 __rtnl_af_unregister(&inet6_ops);
5521
176c39af
DL		 5522 /* clean dev list */
5523 for_each_netdev(&init_net, dev) {
5524 if (__in6_dev_get(dev) == NULL)
5525 continue;
5526 addrconf_ifdown(dev, 1);
5527 }
5528 addrconf_ifdown(init_net.loopback_dev, 2);
5529
1da177e4
LT		 5530 /*
5531 * Check hash table.
5532 */
5c578aed 5533 spin_lock_bh(&addrconf_hash_lock);
c2e21293 5534 for (i = 0; i < IN6_ADDR_HSIZE; i++)
5535 WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
5c578aed 5536 spin_unlock_bh(&addrconf_hash_lock);
c15b1cca 5537 cancel_delayed_work(&addr_chk_work);
1da177e4 5538 rtnl_unlock();
c15b1cca
HFS		 5539
5540 destroy_workqueue(addrconf_wq);
1da177e4 5541}
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