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Merge tag 'for-4.1' of git://git.kernel.org/pub/scm/linux/kernel/git/kishon/linux...
[deliverable/linux.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)
c58da4c6
EK		 1524{
1525 return ipv6_chk_addr_and_flags(net, addr, dev, strict, IFA_F_TENTATIVE);
1526}
1527EXPORT_SYMBOL(ipv6_chk_addr);
1528
1529int ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr,
1530 const struct net_device *dev, int strict,
1531 u32 banned_flags)
1da177e4 1532{
eedf042a 1533 struct inet6_ifaddr *ifp;
ddbe5032 1534 unsigned int hash = inet6_addr_hash(addr);
c58da4c6 1535 u32 ifp_flags;
1da177e4 1536
5c578aed 1537 rcu_read_lock_bh();
b67bfe0d 1538 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
878628fb 1539 if (!net_eq(dev_net(ifp->idev->dev), net))
bfeade08 1540 continue;
c58da4c6
EK		 1541 /* Decouple optimistic from tentative for evaluation here.
1542 * Ban optimistic addresses explicitly, when required.
1543 */
1544 ifp_flags = (ifp->flags&IFA_F_OPTIMISTIC)
1545 ? (ifp->flags&~IFA_F_TENTATIVE)
1546 : ifp->flags;
1da177e4 1547 if (ipv6_addr_equal(&ifp->addr, addr) &&
c58da4c6 1548 !(ifp_flags&banned_flags) &&
eedf042a
SH		 1549 (dev == NULL || ifp->idev->dev == dev ||
1550 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) {
1551 rcu_read_unlock_bh();
1552 return 1;
1da177e4
LT		 1553 }
1554 }
5c578aed 1555
eedf042a
SH		 1556 rcu_read_unlock_bh();
1557 return 0;
1da177e4 1558}
c58da4c6 1559EXPORT_SYMBOL(ipv6_chk_addr_and_flags);
7159039a 1560
3e81c6da
DM		 1561static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1562 struct net_device *dev)
1da177e4 1563{
ddbe5032 1564 unsigned int hash = inet6_addr_hash(addr);
c2e21293 1565 struct inet6_ifaddr *ifp;
1da177e4 1566
b67bfe0d 1567 hlist_for_each_entry(ifp, &inet6_addr_lst[hash], addr_lst) {
878628fb 1568 if (!net_eq(dev_net(ifp->idev->dev), net))
06bfe655 1569 continue;
1da177e4
LT		 1570 if (ipv6_addr_equal(&ifp->addr, addr)) {
1571 if (dev == NULL || ifp->idev->dev == dev)
3e81c6da 1572 return true;
1da177e4
LT		 1573 }
1574 }
3e81c6da 1575 return false;
1da177e4
LT		 1576}
1577
7df37ff3
CB		 1578/* Compares an address/prefix_len with addresses on device @dev.
1579 * If one is found it returns true.
1580 */
1581bool ipv6_chk_custom_prefix(const struct in6_addr *addr,
1582 const unsigned int prefix_len, struct net_device *dev)
1583{
1584 struct inet6_dev *idev;
1585 struct inet6_ifaddr *ifa;
1586 bool ret = false;
1587
1588 rcu_read_lock();
1589 idev = __in6_dev_get(dev);
1590 if (idev) {
1591 read_lock_bh(&idev->lock);
1592 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1593 ret = ipv6_prefix_equal(addr, &ifa->addr, prefix_len);
1594 if (ret)
1595 break;
1596 }
1597 read_unlock_bh(&idev->lock);
1598 }
1599 rcu_read_unlock();
1600
1601 return ret;
1602}
1603EXPORT_SYMBOL(ipv6_chk_custom_prefix);
1604
b71d1d42 1605int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev)
52eeeb84
YH		 1606{
1607 struct inet6_dev *idev;
1608 struct inet6_ifaddr *ifa;
1609 int onlink;
1610
1611 onlink = 0;
1612 rcu_read_lock();
1613 idev = __in6_dev_get(dev);
1614 if (idev) {
1615 read_lock_bh(&idev->lock);
502a2ffd 1616 list_for_each_entry(ifa, &idev->addr_list, if_list) {
52eeeb84
YH		 1617 onlink = ipv6_prefix_equal(addr, &ifa->addr,
1618 ifa->prefix_len);
1619 if (onlink)
1620 break;
1621 }
1622 read_unlock_bh(&idev->lock);
1623 }
1624 rcu_read_unlock();
1625 return onlink;
1626}
52eeeb84
YH		 1627EXPORT_SYMBOL(ipv6_chk_prefix);
1628
9acd9f3a 1629struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1cab3da6 1630 struct net_device *dev, int strict)
1da177e4 1631{
b79d1d54 1632 struct inet6_ifaddr *ifp, *result = NULL;
ddbe5032 1633 unsigned int hash = inet6_addr_hash(addr);
1da177e4 1634
5c578aed 1635 rcu_read_lock_bh();
b67bfe0d 1636 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
878628fb 1637 if (!net_eq(dev_net(ifp->idev->dev), net))
1cab3da6 1638 continue;
1da177e4
LT		 1639 if (ipv6_addr_equal(&ifp->addr, addr)) {
1640 if (dev == NULL || ifp->idev->dev == dev ||
1641 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
b79d1d54 1642 result = ifp;
1da177e4
LT		 1643 in6_ifa_hold(ifp);
1644 break;
1645 }
1646 }
1647 }
5c578aed 1648 rcu_read_unlock_bh();
1da177e4 1649
b79d1d54 1650 return result;
1da177e4
LT		 1651}
1652
1da177e4
LT		 1653/* Gets referenced address, destroys ifaddr */
1654
cc411d0b 1655static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
1da177e4 1656{
1da177e4
LT		 1657 if (ifp->flags&IFA_F_PERMANENT) {
1658 spin_lock_bh(&ifp->lock);
c15b1cca 1659 addrconf_del_dad_work(ifp);
1da177e4 1660 ifp->flags |= IFA_F_TENTATIVE;
cc411d0b
BH		 1661 if (dad_failed)
1662 ifp->flags |= IFA_F_DADFAILED;
1da177e4 1663 spin_unlock_bh(&ifp->lock);
e2577a06
HX		 1664 if (dad_failed)
1665 ipv6_ifa_notify(0, ifp);
1da177e4 1666 in6_ifa_put(ifp);
1da177e4
LT		 1667 } else if (ifp->flags&IFA_F_TEMPORARY) {
1668 struct inet6_ifaddr *ifpub;
1669 spin_lock_bh(&ifp->lock);
1670 ifpub = ifp->ifpub;
1671 if (ifpub) {
1672 in6_ifa_hold(ifpub);
1673 spin_unlock_bh(&ifp->lock);
1674 ipv6_create_tempaddr(ifpub, ifp);
1675 in6_ifa_put(ifpub);
1676 } else {
1677 spin_unlock_bh(&ifp->lock);
1678 }
1679 ipv6_del_addr(ifp);
c15b1cca 1680 } else {
1da177e4 1681 ipv6_del_addr(ifp);
c15b1cca 1682 }
1da177e4
LT		 1683}
1684
f2344a13
HX		 1685static int addrconf_dad_end(struct inet6_ifaddr *ifp)
1686{
1687 int err = -ENOENT;
1688
c15b1cca 1689 spin_lock_bh(&ifp->state_lock);
f2344a13
HX		 1690 if (ifp->state == INET6_IFADDR_STATE_DAD) {
1691 ifp->state = INET6_IFADDR_STATE_POSTDAD;
1692 err = 0;
1693 }
c15b1cca 1694 spin_unlock_bh(&ifp->state_lock);
f2344a13
HX		 1695
1696 return err;
1697}
1698
3c21edbd
YH		 1699void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1700{
1b34be74 1701 struct inet6_dev *idev = ifp->idev;
9bdd8d40 1702
853dc2e0
UB		 1703 if (addrconf_dad_end(ifp)) {
1704 in6_ifa_put(ifp);
f2344a13 1705 return;
853dc2e0 1706 }
f2344a13 1707
e87cc472
JP		 1708 net_info_ratelimited("%s: IPv6 duplicate address %pI6c detected!\n",
1709 ifp->idev->dev->name, &ifp->addr);
9bdd8d40 1710
1b34be74
YH		 1711 if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6) {
1712 struct in6_addr addr;
1713
1714 addr.s6_addr32[0] = htonl(0xfe800000);
1715 addr.s6_addr32[1] = 0;
1716
1717 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
1718 ipv6_addr_equal(&ifp->addr, &addr)) {
1719 /* DAD failed for link-local based on MAC address */
1720 idev->cnf.disable_ipv6 = 1;
9bdd8d40 1721
f3213831 1722 pr_info("%s: IPv6 being disabled!\n",
9bdd8d40 1723 ifp->idev->dev->name);
1b34be74
YH		 1724 }
1725 }
1726
c15b1cca
HFS		 1727 spin_lock_bh(&ifp->state_lock);
1728 /* transition from _POSTDAD to _ERRDAD */
1729 ifp->state = INET6_IFADDR_STATE_ERRDAD;
1730 spin_unlock_bh(&ifp->state_lock);
1731
1732 addrconf_mod_dad_work(ifp, 0);
3c21edbd 1733}
1da177e4 1734
a9ed4a29
SD		 1735/* Join to solicited addr multicast group.
1736 * caller must hold RTNL */
b71d1d42 1737void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr)
1da177e4
LT		 1738{
1739 struct in6_addr maddr;
1740
1741 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1742 return;
1743
1744 addrconf_addr_solict_mult(addr, &maddr);
1745 ipv6_dev_mc_inc(dev, &maddr);
1746}
1747
a9ed4a29 1748/* caller must hold RTNL */
b71d1d42 1749void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr)
1da177e4
LT		 1750{
1751 struct in6_addr maddr;
1752
1753 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1754 return;
1755
1756 addrconf_addr_solict_mult(addr, &maddr);
1757 __ipv6_dev_mc_dec(idev, &maddr);
1758}
1759
a9ed4a29 1760/* caller must hold RTNL */
20380731 1761static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1da177e4
LT		 1762{
1763 struct in6_addr addr;
c15b1cca 1764
88ad3149 1765 if (ifp->prefix_len >= 127) /* RFC 6164 */
2bda8a0c 1766 return;
1da177e4
LT		 1767 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1768 if (ipv6_addr_any(&addr))
1769 return;
013b4d90 1770 __ipv6_dev_ac_inc(ifp->idev, &addr);
1da177e4
LT		 1771}
1772
a9ed4a29 1773/* caller must hold RTNL */
20380731 1774static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1da177e4
LT		 1775{
1776 struct in6_addr addr;
c15b1cca 1777
88ad3149 1778 if (ifp->prefix_len >= 127) /* RFC 6164 */
32019e65 1779 return;
1da177e4
LT		 1780 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1781 if (ipv6_addr_any(&addr))
1782 return;
1783 __ipv6_dev_ac_dec(ifp->idev, &addr);
1784}
1785
073a8e0e
YH		 1786static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
1787{
1788 if (dev->addr_len != ETH_ALEN)
1789 return -1;
1790 memcpy(eui, dev->dev_addr, 3);
1791 memcpy(eui + 5, dev->dev_addr + 3, 3);
1792
1793 /*
1794 * The zSeries OSA network cards can be shared among various
1795 * OS instances, but the OSA cards have only one MAC address.
1796 * This leads to duplicate address conflicts in conjunction
1797 * with IPv6 if more than one instance uses the same card.
1798 *
1799 * The driver for these cards can deliver a unique 16-bit
1800 * identifier for each instance sharing the same card. It is
1801 * placed instead of 0xFFFE in the interface identifier. The
1802 * "u" bit of the interface identifier is not inverted in this
1803 * case. Hence the resulting interface identifier has local
1804 * scope according to RFC2373.
1805 */
1806 if (dev->dev_id) {
1807 eui[3] = (dev->dev_id >> 8) & 0xFF;
1808 eui[4] = dev->dev_id & 0xFF;
1809 } else {
1810 eui[3] = 0xFF;
1811 eui[4] = 0xFE;
1812 eui[0] ^= 2;
1813 }
1814 return 0;
1815}
1816
06a4c1c5 1817static int addrconf_ifid_eui64(u8 *eui, struct net_device *dev)
1818{
1819 if (dev->addr_len != IEEE802154_ADDR_LEN)
1820 return -1;
1821 memcpy(eui, dev->dev_addr, 8);
5e98a36e 1822 eui[0] ^= 2;
06a4c1c5 1823 return 0;
1824}
1825
cb6bf355
YH		 1826static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev)
1827{
1828 union fwnet_hwaddr *ha;
1829
1830 if (dev->addr_len != FWNET_ALEN)
1831 return -1;
1832
1833 ha = (union fwnet_hwaddr *)dev->dev_addr;
1834
1835 memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id));
1836 eui[0] ^= 2;
1837 return 0;
1838}
1839
073a8e0e
YH		 1840static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1841{
1842 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1843 if (dev->addr_len != ARCNET_ALEN)
1844 return -1;
1845 memset(eui, 0, 7);
8e5e8f30 1846 eui[7] = *(u8 *)dev->dev_addr;
073a8e0e
YH		 1847 return 0;
1848}
1849
1850static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1851{
1852 if (dev->addr_len != INFINIBAND_ALEN)
1853 return -1;
1854 memcpy(eui, dev->dev_addr + 12, 8);
1855 eui[0] |= 2;
1856 return 0;
1857}
1858
c61393ea 1859static int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
dfd982ba 1860{
9af28511
SH		 1861 if (addr == 0)
1862 return -1;
dfd982ba
YH		 1863 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
1864 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
1865 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
1866 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
1867 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
1868 ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
1869 eui[1] = 0;
1870 eui[2] = 0x5E;
1871 eui[3] = 0xFE;
1872 memcpy(eui + 4, &addr, 4);
1873 return 0;
1874}
dfd982ba
YH		 1875
1876static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
1877{
1878 if (dev->priv_flags & IFF_ISATAP)
1879 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1880 return -1;
1881}
1882
aee80b54 1883static int addrconf_ifid_gre(u8 *eui, struct net_device *dev)
1884{
1885 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1886}
1887
e837735e
ND		 1888static int addrconf_ifid_ip6tnl(u8 *eui, struct net_device *dev)
1889{
1890 memcpy(eui, dev->perm_addr, 3);
1891 memcpy(eui + 5, dev->perm_addr + 3, 3);
1892 eui[3] = 0xFF;
1893 eui[4] = 0xFE;
1894 eui[0] ^= 2;
1895 return 0;
1896}
1897
1da177e4
LT		 1898static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1899{
1900 switch (dev->type) {
1901 case ARPHRD_ETHER:
1902 case ARPHRD_FDDI:
073a8e0e 1903 return addrconf_ifid_eui48(eui, dev);
1da177e4 1904 case ARPHRD_ARCNET:
073a8e0e 1905 return addrconf_ifid_arcnet(eui, dev);
1da177e4 1906 case ARPHRD_INFINIBAND:
073a8e0e 1907 return addrconf_ifid_infiniband(eui, dev);
c7dc89c0 1908 case ARPHRD_SIT:
dfd982ba 1909 return addrconf_ifid_sit(eui, dev);
aee80b54 1910 case ARPHRD_IPGRE:
1911 return addrconf_ifid_gre(eui, dev);
e74bccb8 1912 case ARPHRD_6LOWPAN:
06a4c1c5 1913 case ARPHRD_IEEE802154:
1914 return addrconf_ifid_eui64(eui, dev);
cb6bf355
YH		 1915 case ARPHRD_IEEE1394:
1916 return addrconf_ifid_ieee1394(eui, dev);
e837735e
ND		 1917 case ARPHRD_TUNNEL6:
1918 return addrconf_ifid_ip6tnl(eui, dev);
1da177e4
LT		 1919 }
1920 return -1;
1921}
1922
1923static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1924{
1925 int err = -1;
1926 struct inet6_ifaddr *ifp;
1927
1928 read_lock_bh(&idev->lock);
602582ca
HFS		 1929 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
1930 if (ifp->scope > IFA_LINK)
1931 break;
1da177e4
LT		 1932 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1933 memcpy(eui, ifp->addr.s6_addr+8, 8);
1934 err = 0;
1935 break;
1936 }
1937 }
1938 read_unlock_bh(&idev->lock);
1939 return err;
1940}
1941
1da177e4 1942/* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
eb7e0575 1943static void __ipv6_regen_rndid(struct inet6_dev *idev)
1da177e4 1944{
1da177e4 1945regen:
955189ef 1946 get_random_bytes(idev->rndid, sizeof(idev->rndid));
1da177e4 1947 idev->rndid[0] &= ~0x02;
1da177e4
LT		 1948
1949 /*
1950 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1951 * check if generated address is not inappropriate
1952 *
1953 * - Reserved subnet anycast (RFC 2526)
1954 * 11111101 11....11 1xxxxxxx
c7dc89c0 1955 * - ISATAP (RFC4214) 6.1
1da177e4
LT		 1956 * 00-00-5E-FE-xx-xx-xx-xx
1957 * - value 0
1958 * - XXX: already assigned to an address on the device
1959 */
1ab1457c 1960 if (idev->rndid[0] == 0xfd &&
1da177e4
LT		 1961 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1962 (idev->rndid[7]&0x80))
1963 goto regen;
1964 if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1965 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1966 goto regen;
1967 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1968 goto regen;
1969 }
1da177e4
LT		 1970}
1971
1972static void ipv6_regen_rndid(unsigned long data)
1973{
1974 struct inet6_dev *idev = (struct inet6_dev *) data;
1975 unsigned long expires;
1976
8814c4b5 1977 rcu_read_lock_bh();
1da177e4
LT		 1978 write_lock_bh(&idev->lock);
1979
1980 if (idev->dead)
1981 goto out;
1982
eb7e0575 1983 __ipv6_regen_rndid(idev);
1ab1457c 1984
1da177e4 1985 expires = jiffies +
1ab1457c 1986 idev->cnf.temp_prefered_lft * HZ -
1f9248e5
JP		 1987 idev->cnf.regen_max_retry * idev->cnf.dad_transmits *
1988 NEIGH_VAR(idev->nd_parms, RETRANS_TIME) -
784e2710 1989 idev->cnf.max_desync_factor * HZ;
1da177e4 1990 if (time_before(expires, jiffies)) {
f3213831
JP		 1991 pr_warn("%s: too short regeneration interval; timer disabled for %s\n",
1992 __func__, idev->dev->name);
1da177e4
LT		 1993 goto out;
1994 }
1995
1996 if (!mod_timer(&idev->regen_timer, expires))
1997 in6_dev_hold(idev);
1998
1999out:
2000 write_unlock_bh(&idev->lock);
8814c4b5 2001 rcu_read_unlock_bh();
1da177e4
LT		 2002 in6_dev_put(idev);
2003}
2004
eb7e0575 2005static void __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr)
8e5e8f30 2006{
1da177e4 2007 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
eb7e0575 2008 __ipv6_regen_rndid(idev);
1da177e4 2009}
1da177e4
LT		 2010
2011/*
2012 * Add prefix route.
2013 */
2014
2015static void
2016addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
e431b8c0 2017 unsigned long expires, u32 flags)
1da177e4 2018{
86872cb5
TG		 2019 struct fib6_config cfg = {
2020 .fc_table = RT6_TABLE_PREFIX,
2021 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2022 .fc_ifindex = dev->ifindex,
2023 .fc_expires = expires,
2024 .fc_dst_len = plen,
2025 .fc_flags = RTF_UP | flags,
c346dca1 2026 .fc_nlinfo.nl_net = dev_net(dev),
f410a1fb 2027 .fc_protocol = RTPROT_KERNEL,
86872cb5 2028 };
1da177e4 2029
4e3fd7a0 2030 cfg.fc_dst = *pfx;
1da177e4
LT		 2031
2032 /* Prevent useless cloning on PtP SIT.
2033 This thing is done here expecting that the whole
2034 class of non-broadcast devices need not cloning.
2035 */
07a93626 2036#if IS_ENABLED(CONFIG_IPV6_SIT)
86872cb5
TG		 2037 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
2038 cfg.fc_flags |= RTF_NONEXTHOP;
0be669bb 2039#endif
1da177e4 2040
86872cb5 2041 ip6_route_add(&cfg);
1da177e4
LT		 2042}
2043
14ef37b6
AH		 2044
2045static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
2046 int plen,
2047 const struct net_device *dev,
2048 u32 flags, u32 noflags)
2049{
2050 struct fib6_node *fn;
2051 struct rt6_info *rt = NULL;
2052 struct fib6_table *table;
2053
2054 table = fib6_get_table(dev_net(dev), RT6_TABLE_PREFIX);
2055 if (table == NULL)
2056 return NULL;
2057
5744dd9b 2058 read_lock_bh(&table->tb6_lock);
14ef37b6
AH		 2059 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0);
2060 if (!fn)
2061 goto out;
2062 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
d1918542 2063 if (rt->dst.dev->ifindex != dev->ifindex)
14ef37b6
AH		 2064 continue;
2065 if ((rt->rt6i_flags & flags) != flags)
2066 continue;
85da53bf 2067 if ((rt->rt6i_flags & noflags) != 0)
14ef37b6
AH		 2068 continue;
2069 dst_hold(&rt->dst);
2070 break;
2071 }
2072out:
5744dd9b 2073 read_unlock_bh(&table->tb6_lock);
14ef37b6
AH		 2074 return rt;
2075}
2076
2077
1da177e4
LT		 2078/* Create "default" multicast route to the interface */
2079
2080static void addrconf_add_mroute(struct net_device *dev)
2081{
86872cb5
TG		 2082 struct fib6_config cfg = {
2083 .fc_table = RT6_TABLE_LOCAL,
2084 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2085 .fc_ifindex = dev->ifindex,
2086 .fc_dst_len = 8,
2087 .fc_flags = RTF_UP,
c346dca1 2088 .fc_nlinfo.nl_net = dev_net(dev),
86872cb5
TG		 2089 };
2090
2091 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
2092
2093 ip6_route_add(&cfg);
1da177e4
LT		 2094}
2095
1da177e4
LT		 2096static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
2097{
2098 struct inet6_dev *idev;
2099
2100 ASSERT_RTNL();
2101
e21e8467
SH		 2102 idev = ipv6_find_idev(dev);
2103 if (!idev)
64e724f6
BH		 2104 return ERR_PTR(-ENOBUFS);
2105
2106 if (idev->cnf.disable_ipv6)
2107 return ERR_PTR(-EACCES);
1da177e4
LT		 2108
2109 /* Add default multicast route */
4af04aba
LW		 2110 if (!(dev->flags & IFF_LOOPBACK))
2111 addrconf_add_mroute(dev);
1da177e4 2112
1da177e4
LT		 2113 return idev;
2114}
2115
53bd6749
JP		 2116static void manage_tempaddrs(struct inet6_dev *idev,
2117 struct inet6_ifaddr *ifp,
2118 __u32 valid_lft, __u32 prefered_lft,
2119 bool create, unsigned long now)
2120{
2121 u32 flags;
2122 struct inet6_ifaddr *ift;
2123
2124 read_lock_bh(&idev->lock);
2125 /* update all temporary addresses in the list */
2126 list_for_each_entry(ift, &idev->tempaddr_list, tmp_list) {
2127 int age, max_valid, max_prefered;
2128
2129 if (ifp != ift->ifpub)
2130 continue;
2131
2132 /* RFC 4941 section 3.3:
2133 * If a received option will extend the lifetime of a public
2134 * address, the lifetimes of temporary addresses should
2135 * be extended, subject to the overall constraint that no
2136 * temporary addresses should ever remain "valid" or "preferred"
2137 * for a time longer than (TEMP_VALID_LIFETIME) or
2138 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), respectively.
2139 */
2140 age = (now - ift->cstamp) / HZ;
2141 max_valid = idev->cnf.temp_valid_lft - age;
2142 if (max_valid < 0)
2143 max_valid = 0;
2144
2145 max_prefered = idev->cnf.temp_prefered_lft -
2146 idev->cnf.max_desync_factor - age;
2147 if (max_prefered < 0)
2148 max_prefered = 0;
2149
2150 if (valid_lft > max_valid)
2151 valid_lft = max_valid;
2152
2153 if (prefered_lft > max_prefered)
2154 prefered_lft = max_prefered;
2155
2156 spin_lock(&ift->lock);
2157 flags = ift->flags;
2158 ift->valid_lft = valid_lft;
2159 ift->prefered_lft = prefered_lft;
2160 ift->tstamp = now;
2161 if (prefered_lft > 0)
2162 ift->flags &= ~IFA_F_DEPRECATED;
2163
2164 spin_unlock(&ift->lock);
2165 if (!(flags&IFA_F_TENTATIVE))
2166 ipv6_ifa_notify(0, ift);
2167 }
2168
2169 if ((create || list_empty(&idev->tempaddr_list)) &&
2170 idev->cnf.use_tempaddr > 0) {
2171 /* When a new public address is created as described
2172 * in [ADDRCONF], also create a new temporary address.
2173 * Also create a temporary address if it's enabled but
2174 * no temporary address currently exists.
2175 */
2176 read_unlock_bh(&idev->lock);
2177 ipv6_create_tempaddr(ifp, NULL);
2178 } else {
2179 read_unlock_bh(&idev->lock);
2180 }
2181}
2182
e6bff995 2183void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao)
1da177e4
LT		 2184{
2185 struct prefix_info *pinfo;
2186 __u32 valid_lft;
2187 __u32 prefered_lft;
2188 int addr_type;
1da177e4 2189 struct inet6_dev *in6_dev;
56d417b1 2190 struct net *net = dev_net(dev);
1da177e4
LT		 2191
2192 pinfo = (struct prefix_info *) opt;
1ab1457c 2193
1da177e4 2194 if (len < sizeof(struct prefix_info)) {
ba3542e1 2195 ADBG("addrconf: prefix option too short\n");
1da177e4
LT		 2196 return;
2197 }
1ab1457c 2198
1da177e4
LT		 2199 /*
2200 * Validation checks ([ADDRCONF], page 19)
2201 */
2202
2203 addr_type = ipv6_addr_type(&pinfo->prefix);
2204
2205 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
2206 return;
2207
2208 valid_lft = ntohl(pinfo->valid);
2209 prefered_lft = ntohl(pinfo->prefered);
2210
2211 if (prefered_lft > valid_lft) {
e87cc472 2212 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n");
1da177e4
LT		 2213 return;
2214 }
2215
2216 in6_dev = in6_dev_get(dev);
2217
2218 if (in6_dev == NULL) {
e87cc472
JP		 2219 net_dbg_ratelimited("addrconf: device %s not configured\n",
2220 dev->name);
1da177e4
LT		 2221 return;
2222 }
2223
2224 /*
2225 * Two things going on here:
2226 * 1) Add routes for on-link prefixes
2227 * 2) Configure prefixes with the auto flag set
2228 */
2229
4bed72e4
YH		 2230 if (pinfo->onlink) {
2231 struct rt6_info *rt;
2232 unsigned long rt_expires;
2233
6f704992
YH		 2234 /* Avoid arithmetic overflow. Really, we could
2235 * save rt_expires in seconds, likely valid_lft,
2236 * but it would require division in fib gc, that it
2237 * not good.
2238 */
4bed72e4
YH		 2239 if (HZ > USER_HZ)
2240 rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
2241 else
2242 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
3dd4bc68 2243
4bed72e4
YH		 2244 if (addrconf_finite_timeout(rt_expires))
2245 rt_expires *= HZ;
1da177e4 2246
14ef37b6
AH		 2247 rt = addrconf_get_prefix_route(&pinfo->prefix,
2248 pinfo->prefix_len,
2249 dev,
2250 RTF_ADDRCONF | RTF_PREFIX_RT,
2251 RTF_GATEWAY | RTF_DEFAULT);
1da177e4 2252
14ef37b6 2253 if (rt) {
6f704992
YH		 2254 /* Autoconf prefix route */
2255 if (valid_lft == 0) {
2256 ip6_del_rt(rt);
2257 rt = NULL;
4bed72e4 2258 } else if (addrconf_finite_timeout(rt_expires)) {
6f704992 2259 /* not infinity */
1716a961 2260 rt6_set_expires(rt, jiffies + rt_expires);
6f704992 2261 } else {
1716a961 2262 rt6_clean_expires(rt);
1da177e4
LT		 2263 }
2264 } else if (valid_lft) {
6f704992 2265 clock_t expires = 0;
4bed72e4
YH		 2266 int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
2267 if (addrconf_finite_timeout(rt_expires)) {
6f704992
YH		 2268 /* not infinity */
2269 flags |= RTF_EXPIRES;
2270 expires = jiffies_to_clock_t(rt_expires);
2271 }
1da177e4 2272 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
6f704992 2273 dev, expires, flags);
1da177e4 2274 }
94e187c0 2275 ip6_rt_put(rt);
1da177e4
LT		 2276 }
2277
2278 /* Try to figure out our local address for this prefix */
2279
2280 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
8e5e8f30 2281 struct inet6_ifaddr *ifp;
1da177e4
LT		 2282 struct in6_addr addr;
2283 int create = 0, update_lft = 0;
617fe29d 2284 bool tokenized = false;
1da177e4
LT		 2285
2286 if (pinfo->prefix_len == 64) {
2287 memcpy(&addr, &pinfo->prefix, 8);
f53adae4
DB		 2288
2289 if (!ipv6_addr_any(&in6_dev->token)) {
2290 read_lock_bh(&in6_dev->lock);
2291 memcpy(addr.s6_addr + 8,
2292 in6_dev->token.s6_addr + 8, 8);
2293 read_unlock_bh(&in6_dev->lock);
617fe29d 2294 tokenized = true;
f53adae4
DB		 2295 } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
2296 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
1da177e4
LT		 2297 in6_dev_put(in6_dev);
2298 return;
2299 }
2300 goto ok;
2301 }
e87cc472
JP		 2302 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n",
2303 pinfo->prefix_len);
1da177e4
LT		 2304 in6_dev_put(in6_dev);
2305 return;
2306
2307ok:
2308
53b7997f 2309 ifp = ipv6_get_ifaddr(net, &addr, dev, 1);
1da177e4
LT		 2310
2311 if (ifp == NULL && valid_lft) {
2312 int max_addresses = in6_dev->cnf.max_addresses;
95c385b4
NH		 2313 u32 addr_flags = 0;
2314
2315#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2316 if (in6_dev->cnf.optimistic_dad &&
e6bff995 2317 !net->ipv6.devconf_all->forwarding && sllao)
95c385b4
NH		 2318 addr_flags = IFA_F_OPTIMISTIC;
2319#endif
1da177e4
LT		 2320
2321 /* Do not allow to create too much of autoconfigured
2322 * addresses; this would be too easy way to crash kernel.
2323 */
2324 if (!max_addresses ||
2325 ipv6_count_addresses(in6_dev) < max_addresses)
3f8f5298
JP		 2326 ifp = ipv6_add_addr(in6_dev, &addr, NULL,
2327 pinfo->prefix_len,
95c385b4 2328 addr_type&IPV6_ADDR_SCOPE_MASK,
8a226b2c
JB		 2329 addr_flags, valid_lft,
2330 prefered_lft);
1da177e4 2331
3f0d2ba0 2332 if (IS_ERR_OR_NULL(ifp)) {
1da177e4
LT		 2333 in6_dev_put(in6_dev);
2334 return;
2335 }
2336
8a226b2c
JB		 2337 update_lft = 0;
2338 create = 1;
c15b1cca
HFS		 2339 spin_lock_bh(&ifp->lock);
2340 ifp->flags |= IFA_F_MANAGETEMPADDR;
1da177e4 2341 ifp->cstamp = jiffies;
617fe29d 2342 ifp->tokenized = tokenized;
c15b1cca 2343 spin_unlock_bh(&ifp->lock);
cf22f9a2 2344 addrconf_dad_start(ifp);
1da177e4
LT		 2345 }
2346
2347 if (ifp) {
479840ff 2348 u32 flags;
1da177e4 2349 unsigned long now;
1da177e4
LT		 2350 u32 stored_lft;
2351
2352 /* update lifetime (RFC2462 5.5.3 e) */
2353 spin_lock(&ifp->lock);
2354 now = jiffies;
2355 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
2356 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
2357 else
2358 stored_lft = 0;
8a226b2c 2359 if (!update_lft && !create && stored_lft) {
9451a304
FF		 2360 const u32 minimum_lft = min_t(u32,
2361 stored_lft, MIN_VALID_LIFETIME);
c9d55d5b
PM		 2362 valid_lft = max(valid_lft, minimum_lft);
2363
2364 /* RFC4862 Section 5.5.3e:
2365 * "Note that the preferred lifetime of the
2366 * corresponding address is always reset to
2367 * the Preferred Lifetime in the received
2368 * Prefix Information option, regardless of
2369 * whether the valid lifetime is also reset or
2370 * ignored."
2371 *
2372 * So we should always update prefered_lft here.
2373 */
2374 update_lft = 1;
1da177e4
LT		 2375 }
2376
2377 if (update_lft) {
2378 ifp->valid_lft = valid_lft;
2379 ifp->prefered_lft = prefered_lft;
2380 ifp->tstamp = now;
2381 flags = ifp->flags;
2382 ifp->flags &= ~IFA_F_DEPRECATED;
2383 spin_unlock(&ifp->lock);
2384
2385 if (!(flags&IFA_F_TENTATIVE))
2386 ipv6_ifa_notify(0, ifp);
2387 } else
2388 spin_unlock(&ifp->lock);
2389
53bd6749
JP		 2390 manage_tempaddrs(in6_dev, ifp, valid_lft, prefered_lft,
2391 create, now);
5d9efa7e 2392
1da177e4 2393 in6_ifa_put(ifp);
c15b1cca 2394 addrconf_verify();
1da177e4
LT		 2395 }
2396 }
2397 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
2398 in6_dev_put(in6_dev);
2399}
2400
2401/*
2402 * Set destination address.
2403 * Special case for SIT interfaces where we create a new "virtual"
2404 * device.
2405 */
af284937 2406int addrconf_set_dstaddr(struct net *net, void __user *arg)
1da177e4
LT		 2407{
2408 struct in6_ifreq ireq;
2409 struct net_device *dev;
2410 int err = -EINVAL;
2411
2412 rtnl_lock();
2413
2414 err = -EFAULT;
2415 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2416 goto err_exit;
2417
af284937 2418 dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
1da177e4
LT		 2419
2420 err = -ENODEV;
2421 if (dev == NULL)
2422 goto err_exit;
2423
07a93626 2424#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4 2425 if (dev->type == ARPHRD_SIT) {
5bc3eb7e 2426 const struct net_device_ops *ops = dev->netdev_ops;
1da177e4 2427 struct ifreq ifr;
1da177e4
LT		 2428 struct ip_tunnel_parm p;
2429
2430 err = -EADDRNOTAVAIL;
2431 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2432 goto err_exit;
2433
2434 memset(&p, 0, sizeof(p));
2435 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2436 p.iph.saddr = 0;
2437 p.iph.version = 4;
2438 p.iph.ihl = 5;
2439 p.iph.protocol = IPPROTO_IPV6;
2440 p.iph.ttl = 64;
d20b3109 2441 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
1da177e4 2442
5bc3eb7e
SH		 2443 if (ops->ndo_do_ioctl) {
2444 mm_segment_t oldfs = get_fs();
2445
2446 set_fs(KERNEL_DS);
2447 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2448 set_fs(oldfs);
2449 } else
2450 err = -EOPNOTSUPP;
1da177e4
LT		 2451
2452 if (err == 0) {
2453 err = -ENOBUFS;
af284937
DL		 2454 dev = __dev_get_by_name(net, p.name);
2455 if (!dev)
1da177e4
LT		 2456 goto err_exit;
2457 err = dev_open(dev);
2458 }
2459 }
0be669bb 2460#endif
1da177e4
LT		 2461
2462err_exit:
2463 rtnl_unlock();
2464 return err;
2465}
2466
2467/*
2468 * Manual configuration of address on an interface
2469 */
479840ff
JP		 2470static int inet6_addr_add(struct net *net, int ifindex,
2471 const struct in6_addr *pfx,
caeaba79 2472 const struct in6_addr *peer_pfx,
479840ff
JP		 2473 unsigned int plen, __u32 ifa_flags,
2474 __u32 prefered_lft, __u32 valid_lft)
1da177e4
LT		 2475{
2476 struct inet6_ifaddr *ifp;
2477 struct inet6_dev *idev;
2478 struct net_device *dev;
2479 int scope;
6f704992
YH		 2480 u32 flags;
2481 clock_t expires;
4bed72e4 2482 unsigned long timeout;
1da177e4
LT		 2483
2484 ASSERT_RTNL();
1ab1457c 2485
24ef0da7
TG		 2486 if (plen > 128)
2487 return -EINVAL;
2488
0778769d
NT		 2489 /* check the lifetime */
2490 if (!valid_lft || prefered_lft > valid_lft)
2491 return -EINVAL;
2492
53bd6749
JP		 2493 if (ifa_flags & IFA_F_MANAGETEMPADDR && plen != 64)
2494 return -EINVAL;
2495
af284937
DL		 2496 dev = __dev_get_by_index(net, ifindex);
2497 if (!dev)
1da177e4 2498 return -ENODEV;
1ab1457c 2499
64e724f6
BH		 2500 idev = addrconf_add_dev(dev);
2501 if (IS_ERR(idev))
2502 return PTR_ERR(idev);
1da177e4
LT		 2503
2504 scope = ipv6_addr_scope(pfx);
2505
4bed72e4
YH		 2506 timeout = addrconf_timeout_fixup(valid_lft, HZ);
2507 if (addrconf_finite_timeout(timeout)) {
2508 expires = jiffies_to_clock_t(timeout * HZ);
2509 valid_lft = timeout;
6f704992 2510 flags = RTF_EXPIRES;
4bed72e4
YH		 2511 } else {
2512 expires = 0;
2513 flags = 0;
2514 ifa_flags |= IFA_F_PERMANENT;
6f704992 2515 }
0778769d 2516
4bed72e4
YH		 2517 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
2518 if (addrconf_finite_timeout(timeout)) {
2519 if (timeout == 0)
2520 ifa_flags |= IFA_F_DEPRECATED;
2521 prefered_lft = timeout;
2522 }
0778769d 2523
8a226b2c
JB		 2524 ifp = ipv6_add_addr(idev, pfx, peer_pfx, plen, scope, ifa_flags,
2525 valid_lft, prefered_lft);
0778769d 2526
1da177e4 2527 if (!IS_ERR(ifp)) {
761aac73
TH		 2528 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) {
2529 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
2530 expires, flags);
2531 }
2532
95c385b4
NH		 2533 /*
2534 * Note that section 3.1 of RFC 4429 indicates
2535 * that the Optimistic flag should not be set for
2536 * manually configured addresses
2537 */
cf22f9a2 2538 addrconf_dad_start(ifp);
53bd6749
JP		 2539 if (ifa_flags & IFA_F_MANAGETEMPADDR)
2540 manage_tempaddrs(idev, ifp, valid_lft, prefered_lft,
2541 true, jiffies);
1da177e4 2542 in6_ifa_put(ifp);
c15b1cca 2543 addrconf_verify_rtnl();
1da177e4
LT		 2544 return 0;
2545 }
2546
2547 return PTR_ERR(ifp);
2548}
2549
6046d5b4
HK		 2550static int inet6_addr_del(struct net *net, int ifindex, u32 ifa_flags,
2551 const struct in6_addr *pfx, unsigned int plen)
1da177e4
LT		 2552{
2553 struct inet6_ifaddr *ifp;
2554 struct inet6_dev *idev;
2555 struct net_device *dev;
1ab1457c 2556
24ef0da7
TG		 2557 if (plen > 128)
2558 return -EINVAL;
2559
af284937
DL		 2560 dev = __dev_get_by_index(net, ifindex);
2561 if (!dev)
1da177e4
LT		 2562 return -ENODEV;
2563
e5d08d71
IM		 2564 idev = __in6_dev_get(dev);
2565 if (idev == NULL)
1da177e4
LT		 2566 return -ENXIO;
2567
2568 read_lock_bh(&idev->lock);
502a2ffd 2569 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1da177e4
LT		 2570 if (ifp->prefix_len == plen &&
2571 ipv6_addr_equal(pfx, &ifp->addr)) {
2572 in6_ifa_hold(ifp);
2573 read_unlock_bh(&idev->lock);
1ab1457c 2574
6046d5b4
HK		 2575 if (!(ifp->flags & IFA_F_TEMPORARY) &&
2576 (ifa_flags & IFA_F_MANAGETEMPADDR))
2577 manage_tempaddrs(idev, ifp, 0, 0, false,
2578 jiffies);
1da177e4 2579 ipv6_del_addr(ifp);
6046d5b4 2580 addrconf_verify_rtnl();
1da177e4
LT		 2581 return 0;
2582 }
2583 }
2584 read_unlock_bh(&idev->lock);
2585 return -EADDRNOTAVAIL;
2586}
2587
2588
af284937 2589int addrconf_add_ifaddr(struct net *net, void __user *arg)
1da177e4
LT		 2590{
2591 struct in6_ifreq ireq;
2592 int err;
1ab1457c 2593
af31f412 2594 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1da177e4 2595 return -EPERM;
1ab1457c 2596
1da177e4
LT		 2597 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2598 return -EFAULT;
2599
2600 rtnl_lock();
caeaba79 2601 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, NULL,
af284937
DL		 2602 ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2603 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
1da177e4
LT		 2604 rtnl_unlock();
2605 return err;
2606}
2607
af284937 2608int addrconf_del_ifaddr(struct net *net, void __user *arg)
1da177e4
LT		 2609{
2610 struct in6_ifreq ireq;
2611 int err;
1ab1457c 2612
af31f412 2613 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1da177e4
LT		 2614 return -EPERM;
2615
2616 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2617 return -EFAULT;
2618
2619 rtnl_lock();
6046d5b4 2620 err = inet6_addr_del(net, ireq.ifr6_ifindex, 0, &ireq.ifr6_addr,
af284937 2621 ireq.ifr6_prefixlen);
1da177e4
LT		 2622 rtnl_unlock();
2623 return err;
2624}
2625
b5f348e5
IJ		 2626static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
2627 int plen, int scope)
2628{
2629 struct inet6_ifaddr *ifp;
2630
8a226b2c 2631 ifp = ipv6_add_addr(idev, addr, NULL, plen,
07edd741
HFS		 2632 scope, IFA_F_PERMANENT,
2633 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
b5f348e5
IJ		 2634 if (!IS_ERR(ifp)) {
2635 spin_lock_bh(&ifp->lock);
2636 ifp->flags &= ~IFA_F_TENTATIVE;
2637 spin_unlock_bh(&ifp->lock);
2638 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2639 in6_ifa_put(ifp);
2640 }
2641}
2642
07a93626 2643#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4
LT		 2644static void sit_add_v4_addrs(struct inet6_dev *idev)
2645{
1da177e4
LT		 2646 struct in6_addr addr;
2647 struct net_device *dev;
c346dca1 2648 struct net *net = dev_net(idev->dev);
929c9cf3 2649 int scope, plen;
f0e2acfa 2650 u32 pflags = 0;
1da177e4
LT		 2651
2652 ASSERT_RTNL();
2653
2654 memset(&addr, 0, sizeof(struct in6_addr));
2655 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2656
2657 if (idev->dev->flags&IFF_POINTOPOINT) {
2658 addr.s6_addr32[0] = htonl(0xfe800000);
2659 scope = IFA_LINK;
929c9cf3 2660 plen = 64;
1da177e4
LT		 2661 } else {
2662 scope = IPV6_ADDR_COMPATv4;
929c9cf3 2663 plen = 96;
f0e2acfa 2664 pflags |= RTF_NONEXTHOP;
1da177e4
LT		 2665 }
2666
2667 if (addr.s6_addr32[3]) {
929c9cf3 2668 add_addr(idev, &addr, plen, scope);
f0e2acfa 2669 addrconf_prefix_route(&addr, plen, idev->dev, 0, pflags);
1da177e4
LT		 2670 return;
2671 }
2672
6fda7350 2673 for_each_netdev(net, dev) {
8e5e8f30 2674 struct in_device *in_dev = __in_dev_get_rtnl(dev);
1da177e4 2675 if (in_dev && (dev->flags & IFF_UP)) {
8e5e8f30 2676 struct in_ifaddr *ifa;
1da177e4
LT		 2677
2678 int flag = scope;
2679
2680 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
1da177e4
LT		 2681
2682 addr.s6_addr32[3] = ifa->ifa_local;
2683
2684 if (ifa->ifa_scope == RT_SCOPE_LINK)
2685 continue;
2686 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2687 if (idev->dev->flags&IFF_POINTOPOINT)
2688 continue;
2689 flag |= IFA_HOST;
2690 }
1da177e4 2691
b5f348e5 2692 add_addr(idev, &addr, plen, flag);
f0e2acfa
ND		 2693 addrconf_prefix_route(&addr, plen, idev->dev, 0,
2694 pflags);
1da177e4
LT		 2695 }
2696 }
1ab1457c 2697 }
1da177e4 2698}
0be669bb 2699#endif
1da177e4
LT		 2700
2701static void init_loopback(struct net_device *dev)
2702{
2703 struct inet6_dev *idev;
25fb6ca4
BK		 2704 struct net_device *sp_dev;
2705 struct inet6_ifaddr *sp_ifa;
2706 struct rt6_info *sp_rt;
1da177e4
LT		 2707
2708 /* ::1 */
2709
2710 ASSERT_RTNL();
2711
e5d08d71
IM		 2712 idev = ipv6_find_idev(dev);
2713 if (idev == NULL) {
91df42be 2714 pr_debug("%s: add_dev failed\n", __func__);
1da177e4
LT		 2715 return;
2716 }
2717
b5f348e5 2718 add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
25fb6ca4
BK		 2719
2720 /* Add routes to other interface's IPv6 addresses */
2721 for_each_netdev(dev_net(dev), sp_dev) {
2722 if (!strcmp(sp_dev->name, dev->name))
2723 continue;
2724
2725 idev = __in6_dev_get(sp_dev);
2726 if (!idev)
2727 continue;
2728
2729 read_lock_bh(&idev->lock);
2730 list_for_each_entry(sp_ifa, &idev->addr_list, if_list) {
2731
2732 if (sp_ifa->flags & (IFA_F_DADFAILED | IFA_F_TENTATIVE))
2733 continue;
2734
33d99113
G		 2735 if (sp_ifa->rt) {
2736 /* This dst has been added to garbage list when
2737 * lo device down, release this obsolete dst and
2738 * reallocate a new router for ifa.
2739 */
2740 if (sp_ifa->rt->dst.obsolete > 0) {
2741 ip6_rt_put(sp_ifa->rt);
2742 sp_ifa->rt = NULL;
2743 } else {
2744 continue;
2745 }
2746 }
a881ae1f 2747
57ec0afe 2748 sp_rt = addrconf_dst_alloc(idev, &sp_ifa->addr, false);
25fb6ca4
BK		 2749
2750 /* Failure cases are ignored */
534c8779
G		 2751 if (!IS_ERR(sp_rt)) {
2752 sp_ifa->rt = sp_rt;
25fb6ca4 2753 ip6_ins_rt(sp_rt);
534c8779 2754 }
25fb6ca4
BK		 2755 }
2756 read_unlock_bh(&idev->lock);
2757 }
1da177e4
LT		 2758}
2759
b71d1d42 2760static void addrconf_add_linklocal(struct inet6_dev *idev, const struct in6_addr *addr)
1da177e4 2761{
8e5e8f30 2762 struct inet6_ifaddr *ifp;
95c385b4
NH		 2763 u32 addr_flags = IFA_F_PERMANENT;
2764
2765#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2766 if (idev->cnf.optimistic_dad &&
702beb87 2767 !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
95c385b4
NH		 2768 addr_flags |= IFA_F_OPTIMISTIC;
2769#endif
1da177e4 2770
95c385b4 2771
07edd741
HFS		 2772 ifp = ipv6_add_addr(idev, addr, NULL, 64, IFA_LINK, addr_flags,
2773 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
1da177e4 2774 if (!IS_ERR(ifp)) {
46d48046 2775 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
cf22f9a2 2776 addrconf_dad_start(ifp);
1da177e4
LT		 2777 in6_ifa_put(ifp);
2778 }
2779}
2780
bc91b0f0
JP		 2781static void addrconf_addr_gen(struct inet6_dev *idev, bool prefix_route)
2782{
2783 if (idev->addr_gen_mode == IN6_ADDR_GEN_MODE_EUI64) {
2784 struct in6_addr addr;
2785
2786 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
2787 /* addrconf_add_linklocal also adds a prefix_route and we
2788 * only need to care about prefix routes if ipv6_generate_eui64
2789 * couldn't generate one.
2790 */
2791 if (ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) == 0)
2792 addrconf_add_linklocal(idev, &addr);
2793 else if (prefix_route)
2794 addrconf_prefix_route(&addr, 64, idev->dev, 0, 0);
2795 }
2796}
2797
1da177e4
LT		 2798static void addrconf_dev_config(struct net_device *dev)
2799{
8e5e8f30 2800 struct inet6_dev *idev;
1da177e4
LT		 2801
2802 ASSERT_RTNL();
2803
74235a25
HX		 2804 if ((dev->type != ARPHRD_ETHER) &&
2805 (dev->type != ARPHRD_FDDI) &&
74235a25 2806 (dev->type != ARPHRD_ARCNET) &&
06a4c1c5 2807 (dev->type != ARPHRD_INFINIBAND) &&
cb6bf355 2808 (dev->type != ARPHRD_IEEE802154) &&
e837735e 2809 (dev->type != ARPHRD_IEEE1394) &&
e74bccb8
JR		 2810 (dev->type != ARPHRD_TUNNEL6) &&
2811 (dev->type != ARPHRD_6LOWPAN)) {
74235a25
HX		 2812 /* Alas, we support only Ethernet autoconfiguration. */
2813 return;
2814 }
2815
1da177e4 2816 idev = addrconf_add_dev(dev);
64e724f6 2817 if (IS_ERR(idev))
1da177e4
LT		 2818 return;
2819
bc91b0f0 2820 addrconf_addr_gen(idev, false);
1da177e4
LT		 2821}
2822
07a93626 2823#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4
LT		 2824static void addrconf_sit_config(struct net_device *dev)
2825{
2826 struct inet6_dev *idev;
2827
2828 ASSERT_RTNL();
2829
1ab1457c
YH		 2830 /*
2831 * Configure the tunnel with one of our IPv4
2832 * addresses... we should configure all of
1da177e4
LT		 2833 * our v4 addrs in the tunnel
2834 */
2835
e5d08d71
IM		 2836 idev = ipv6_find_idev(dev);
2837 if (idev == NULL) {
91df42be 2838 pr_debug("%s: add_dev failed\n", __func__);
1da177e4
LT		 2839 return;
2840 }
2841
c7dc89c0 2842 if (dev->priv_flags & IFF_ISATAP) {
bc91b0f0 2843 addrconf_addr_gen(idev, false);
c7dc89c0
FT		 2844 return;
2845 }
2846
1da177e4
LT		 2847 sit_add_v4_addrs(idev);
2848
62b54dd9 2849 if (dev->flags&IFF_POINTOPOINT)
1da177e4 2850 addrconf_add_mroute(dev);
1da177e4 2851}
0be669bb 2852#endif
1da177e4 2853
07a93626 2854#if IS_ENABLED(CONFIG_NET_IPGRE)
aee80b54 2855static void addrconf_gre_config(struct net_device *dev)
2856{
2857 struct inet6_dev *idev;
aee80b54 2858
aee80b54 2859 ASSERT_RTNL();
2860
e5d08d71
IM		 2861 idev = ipv6_find_idev(dev);
2862 if (idev == NULL) {
91df42be 2863 pr_debug("%s: add_dev failed\n", __func__);
aee80b54 2864 return;
2865 }
2866
bc91b0f0 2867 addrconf_addr_gen(idev, true);
aee80b54 2868}
2869#endif
2870
1ab1457c 2871static int addrconf_notify(struct notifier_block *this, unsigned long event,
351638e7 2872 void *ptr)
1da177e4 2873{
351638e7 2874 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
748e2d93 2875 struct inet6_dev *idev = __in6_dev_get(dev);
c5e33bdd 2876 int run_pending = 0;
b217d616 2877 int err;
1da177e4 2878
e21e8467 2879 switch (event) {
45ba9dd2 2880 case NETDEV_REGISTER:
74235a25 2881 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
45ba9dd2 2882 idev = ipv6_add_dev(dev);
a317a2f1
WC		 2883 if (IS_ERR(idev))
2884 return notifier_from_errno(PTR_ERR(idev));
45ba9dd2
YH		 2885 }
2886 break;
bcdd553f 2887
1da177e4 2888 case NETDEV_UP:
3c21edbd 2889 case NETDEV_CHANGE:
c2edacf8
JV		 2890 if (dev->flags & IFF_SLAVE)
2891 break;
2892
3ce62a84
WC		 2893 if (idev && idev->cnf.disable_ipv6)
2894 break;
2895
3c21edbd 2896 if (event == NETDEV_UP) {
f24e3d65 2897 if (!addrconf_qdisc_ok(dev)) {
3c21edbd 2898 /* device is not ready yet. */
f3213831 2899 pr_info("ADDRCONF(NETDEV_UP): %s: link is not ready\n",
3c21edbd
YH		 2900 dev->name);
2901 break;
2902 }
99081049 2903
d31c7b8f
EP		 2904 if (!idev && dev->mtu >= IPV6_MIN_MTU)
2905 idev = ipv6_add_dev(dev);
2906
a317a2f1 2907 if (!IS_ERR_OR_NULL(idev)) {
99081049 2908 idev->if_flags |= IF_READY;
e3ec6cfc
BT		 2909 run_pending = 1;
2910 }
3c21edbd 2911 } else {
f24e3d65 2912 if (!addrconf_qdisc_ok(dev)) {
3c21edbd
YH		 2913 /* device is still not ready. */
2914 break;
2915 }
2916
2917 if (idev) {
bcdd553f 2918 if (idev->if_flags & IF_READY)
3c21edbd
YH		 2919 /* device is already configured. */
2920 break;
3c21edbd
YH		 2921 idev->if_flags |= IF_READY;
2922 }
2923
f3213831
JP		 2924 pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n",
2925 dev->name);
3c21edbd 2926
c5e33bdd 2927 run_pending = 1;
3c21edbd
YH		 2928 }
2929
e21e8467 2930 switch (dev->type) {
07a93626 2931#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4
LT		 2932 case ARPHRD_SIT:
2933 addrconf_sit_config(dev);
2934 break;
aee80b54 2935#endif
07a93626 2936#if IS_ENABLED(CONFIG_NET_IPGRE)
aee80b54 2937 case ARPHRD_IPGRE:
2938 addrconf_gre_config(dev);
2939 break;
0be669bb 2940#endif
1da177e4
LT		 2941 case ARPHRD_LOOPBACK:
2942 init_loopback(dev);
2943 break;
2944
2945 default:
2946 addrconf_dev_config(dev);
2947 break;
3ff50b79 2948 }
bcdd553f 2949
a317a2f1 2950 if (!IS_ERR_OR_NULL(idev)) {
c5e33bdd
YH		 2951 if (run_pending)
2952 addrconf_dad_run(idev);
2953
bcdd553f
SH		 2954 /*
2955 * If the MTU changed during the interface down,
2956 * when the interface up, the changed MTU must be
2957 * reflected in the idev as well as routers.
1da177e4 2958 */
bcdd553f
SH		 2959 if (idev->cnf.mtu6 != dev->mtu &&
2960 dev->mtu >= IPV6_MIN_MTU) {
1da177e4
LT		 2961 rt6_mtu_change(dev, dev->mtu);
2962 idev->cnf.mtu6 = dev->mtu;
2963 }
2964 idev->tstamp = jiffies;
2965 inet6_ifinfo_notify(RTM_NEWLINK, idev);
bcdd553f
SH		 2966
2967 /*
2968 * If the changed mtu during down is lower than
2969 * IPV6_MIN_MTU stop IPv6 on this interface.
1da177e4
LT		 2970 */
2971 if (dev->mtu < IPV6_MIN_MTU)
bcdd553f 2972 addrconf_ifdown(dev, 1);
1da177e4
LT		 2973 }
2974 break;
2975
2976 case NETDEV_CHANGEMTU:
d31c7b8f 2977 if (idev && dev->mtu >= IPV6_MIN_MTU) {
1da177e4
LT		 2978 rt6_mtu_change(dev, dev->mtu);
2979 idev->cnf.mtu6 = dev->mtu;
2980 break;
2981 }
2982
d31c7b8f
EP		 2983 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2984 idev = ipv6_add_dev(dev);
a317a2f1 2985 if (!IS_ERR(idev))
d31c7b8f
EP		 2986 break;
2987 }
2988
bcdd553f 2989 /*
db9c7c39 2990 * if MTU under IPV6_MIN_MTU.
bcdd553f
SH		 2991 * Stop IPv6 on this interface.
2992 */
1da177e4
LT		 2993
2994 case NETDEV_DOWN:
2995 case NETDEV_UNREGISTER:
2996 /*
2997 * Remove all addresses from this interface.
2998 */
2999 addrconf_ifdown(dev, event != NETDEV_DOWN);
3000 break;
3c21edbd 3001
1da177e4 3002 case NETDEV_CHANGENAME:
1da177e4 3003 if (idev) {
5632c515 3004 snmp6_unregister_dev(idev);
408c4768 3005 addrconf_sysctl_unregister(idev);
a317a2f1 3006 err = addrconf_sysctl_register(idev);
b217d616
HX		 3007 if (err)
3008 return notifier_from_errno(err);
a317a2f1
WC		 3009 err = snmp6_register_dev(idev);
3010 if (err) {
3011 addrconf_sysctl_unregister(idev);
3012 return notifier_from_errno(err);
3013 }
5632c515 3014 }
1da177e4 3015 break;
bcdd553f 3016
93d9b7d7
JP		 3017 case NETDEV_PRE_TYPE_CHANGE:
3018 case NETDEV_POST_TYPE_CHANGE:
3019 addrconf_type_change(dev, event);
75c78500 3020 break;
3ff50b79 3021 }
1da177e4
LT		 3022
3023 return NOTIFY_OK;
3024}
3025
3026/*
3027 * addrconf module should be notified of a device going up
3028 */
3029static struct notifier_block ipv6_dev_notf = {
3030 .notifier_call = addrconf_notify,
1da177e4
LT		 3031};
3032
93d9b7d7 3033static void addrconf_type_change(struct net_device *dev, unsigned long event)
75c78500
MS		 3034{
3035 struct inet6_dev *idev;
3036 ASSERT_RTNL();
3037
3038 idev = __in6_dev_get(dev);
3039
93d9b7d7 3040 if (event == NETDEV_POST_TYPE_CHANGE)
75c78500 3041 ipv6_mc_remap(idev);
93d9b7d7 3042 else if (event == NETDEV_PRE_TYPE_CHANGE)
75c78500
MS		 3043 ipv6_mc_unmap(idev);
3044}
3045
1da177e4
LT		 3046static int addrconf_ifdown(struct net_device *dev, int how)
3047{
c346dca1 3048 struct net *net = dev_net(dev);
502a2ffd 3049 struct inet6_dev *idev;
3050 struct inet6_ifaddr *ifa;
73a8bd74 3051 int state, i;
1da177e4
LT		 3052
3053 ASSERT_RTNL();
3054
73a8bd74
DM		 3055 rt6_ifdown(net, dev);
3056 neigh_ifdown(&nd_tbl, dev);
1da177e4
LT		 3057
3058 idev = __in6_dev_get(dev);
3059 if (idev == NULL)
3060 return -ENODEV;
3061
bcdd553f
SH		 3062 /*
3063 * Step 1: remove reference to ipv6 device from parent device.
3064 * Do not dev_put!
1da177e4 3065 */
439e2385 3066 if (how) {
1da177e4 3067 idev->dead = 1;
8814c4b5
YH		 3068
3069 /* protected by rtnl_lock */
a9b3cd7f 3070 RCU_INIT_POINTER(dev->ip6_ptr, NULL);
1da177e4
LT		 3071
3072 /* Step 1.5: remove snmp6 entry */
3073 snmp6_unregister_dev(idev);
3074
3075 }
3076
73a8bd74
DM		 3077 /* Step 2: clear hash table */
3078 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3079 struct hlist_head *h = &inet6_addr_lst[i];
73a8bd74
DM		 3080
3081 spin_lock_bh(&addrconf_hash_lock);
67ba4152 3082restart:
b67bfe0d 3083 hlist_for_each_entry_rcu(ifa, h, addr_lst) {
73a8bd74
DM		 3084 if (ifa->idev == idev) {
3085 hlist_del_init_rcu(&ifa->addr_lst);
c15b1cca 3086 addrconf_del_dad_work(ifa);
73a8bd74
DM		 3087 goto restart;
3088 }
3089 }
3090 spin_unlock_bh(&addrconf_hash_lock);
3091 }
3092
1da177e4
LT		 3093 write_lock_bh(&idev->lock);
3094
b7b1bfce
HFS		 3095 addrconf_del_rs_timer(idev);
3096
bcdd553f 3097 /* Step 2: clear flags for stateless addrconf */
439e2385 3098 if (!how)
3c21edbd 3099 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
1da177e4 3100
439e2385 3101 if (how && del_timer(&idev->regen_timer))
1da177e4
LT		 3102 in6_dev_put(idev);
3103
bcdd553f 3104 /* Step 3: clear tempaddr list */
372e6c8f 3105 while (!list_empty(&idev->tempaddr_list)) {
3106 ifa = list_first_entry(&idev->tempaddr_list,
3107 struct inet6_ifaddr, tmp_list);
3108 list_del(&ifa->tmp_list);
1da177e4
LT		 3109 write_unlock_bh(&idev->lock);
3110 spin_lock_bh(&ifa->lock);
3111
3112 if (ifa->ifpub) {
3113 in6_ifa_put(ifa->ifpub);
3114 ifa->ifpub = NULL;
3115 }
3116 spin_unlock_bh(&ifa->lock);
3117 in6_ifa_put(ifa);
3118 write_lock_bh(&idev->lock);
3119 }
8f37ada5 3120
502a2ffd 3121 while (!list_empty(&idev->addr_list)) {
3122 ifa = list_first_entry(&idev->addr_list,
3123 struct inet6_ifaddr, if_list);
c15b1cca 3124 addrconf_del_dad_work(ifa);
84e8b803 3125
73a8bd74 3126 list_del(&ifa->if_list);
84e8b803 3127
73a8bd74 3128 write_unlock_bh(&idev->lock);
84e8b803 3129
73a8bd74
DM		 3130 spin_lock_bh(&ifa->state_lock);
3131 state = ifa->state;
3132 ifa->state = INET6_IFADDR_STATE_DEAD;
3133 spin_unlock_bh(&ifa->state_lock);
9d82ca98 3134
73a8bd74
DM		 3135 if (state != INET6_IFADDR_STATE_DEAD) {
3136 __ipv6_ifa_notify(RTM_DELADDR, ifa);
f88c91dd 3137 inet6addr_notifier_call_chain(NETDEV_DOWN, ifa);
27bdb2ab 3138 }
73a8bd74 3139 in6_ifa_put(ifa);
8f37ada5 3140
73a8bd74
DM		 3141 write_lock_bh(&idev->lock);
3142 }
8f37ada5 3143
1da177e4
LT		 3144 write_unlock_bh(&idev->lock);
3145
381f4dca
SD		 3146 /* Step 5: Discard anycast and multicast list */
3147 if (how) {
3148 ipv6_ac_destroy_dev(idev);
1da177e4 3149 ipv6_mc_destroy_dev(idev);
381f4dca 3150 } else {
1da177e4 3151 ipv6_mc_down(idev);
381f4dca 3152 }
1da177e4 3153
1da177e4 3154 idev->tstamp = jiffies;
1ab1457c 3155
bcdd553f 3156 /* Last: Shot the device (if unregistered) */
439e2385 3157 if (how) {
408c4768 3158 addrconf_sysctl_unregister(idev);
1da177e4
LT		 3159 neigh_parms_release(&nd_tbl, idev->nd_parms);
3160 neigh_ifdown(&nd_tbl, dev);
3161 in6_dev_put(idev);
3162 }
3163 return 0;
3164}
3165
3166static void addrconf_rs_timer(unsigned long data)
3167{
b7b1bfce 3168 struct inet6_dev *idev = (struct inet6_dev *)data;
caf92bc4 3169 struct net_device *dev = idev->dev;
b7b1bfce 3170 struct in6_addr lladdr;
1da177e4 3171
b7b1bfce 3172 write_lock(&idev->lock);
5b2a1953 3173 if (idev->dead || !(idev->if_flags & IF_READY))
1da177e4
LT		 3174 goto out;
3175
9ba2add3 3176 if (!ipv6_accept_ra(idev))
5b2a1953 3177 goto out;
3178
3179 /* Announcement received after solicitation was sent */
3180 if (idev->if_flags & IF_RA_RCVD)
1da177e4 3181 goto out;
1da177e4 3182
b7b1bfce 3183 if (idev->rs_probes++ < idev->cnf.rtr_solicits) {
caf92bc4
CW		 3184 write_unlock(&idev->lock);
3185 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
3186 ndisc_send_rs(dev, &lladdr,
b7b1bfce
HFS		 3187 &in6addr_linklocal_allrouters);
3188 else
caf92bc4 3189 goto put;
1da177e4 3190
caf92bc4 3191 write_lock(&idev->lock);
b7b1bfce
HFS		 3192 /* The wait after the last probe can be shorter */
3193 addrconf_mod_rs_timer(idev, (idev->rs_probes ==
3194 idev->cnf.rtr_solicits) ?
3195 idev->cnf.rtr_solicit_delay :
3196 idev->cnf.rtr_solicit_interval);
1da177e4 3197 } else {
1da177e4
LT		 3198 /*
3199 * Note: we do not support deprecated "all on-link"
3200 * assumption any longer.
3201 */
91df42be 3202 pr_debug("%s: no IPv6 routers present\n", idev->dev->name);
1da177e4
LT		 3203 }
3204
3205out:
b7b1bfce 3206 write_unlock(&idev->lock);
caf92bc4 3207put:
b7b1bfce 3208 in6_dev_put(idev);
1da177e4
LT		 3209}
3210
3211/*
3212 * Duplicate Address Detection
3213 */
3c21edbd
YH		 3214static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
3215{
3216 unsigned long rand_num;
3217 struct inet6_dev *idev = ifp->idev;
3218
95c385b4
NH		 3219 if (ifp->flags & IFA_F_OPTIMISTIC)
3220 rand_num = 0;
3221 else
63862b5b 3222 rand_num = prandom_u32() % (idev->cnf.rtr_solicit_delay ? : 1);
95c385b4 3223
b7b1bfce 3224 ifp->dad_probes = idev->cnf.dad_transmits;
c15b1cca 3225 addrconf_mod_dad_work(ifp, rand_num);
3c21edbd
YH		 3226}
3227
c15b1cca 3228static void addrconf_dad_begin(struct inet6_ifaddr *ifp)
1da177e4
LT		 3229{
3230 struct inet6_dev *idev = ifp->idev;
3231 struct net_device *dev = idev->dev;
1da177e4
LT		 3232
3233 addrconf_join_solict(dev, &ifp->addr);
3234
63862b5b 3235 prandom_seed((__force u32) ifp->addr.s6_addr32[3]);
1da177e4
LT		 3236
3237 read_lock_bh(&idev->lock);
622ccdf1 3238 spin_lock(&ifp->lock);
e9d3e084 3239 if (ifp->state == INET6_IFADDR_STATE_DEAD)
1da177e4 3240 goto out;
1da177e4
LT		 3241
3242 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
1b34be74 3243 idev->cnf.accept_dad < 1 ||
55ebaef1
NT		 3244 !(ifp->flags&IFA_F_TENTATIVE) ||
3245 ifp->flags & IFA_F_NODAD) {
cc411d0b 3246 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
21809faf 3247 spin_unlock(&ifp->lock);
1da177e4
LT		 3248 read_unlock_bh(&idev->lock);
3249
3250 addrconf_dad_completed(ifp);
3251 return;
3252 }
3253
6732bade 3254 if (!(idev->if_flags & IF_READY)) {
21809faf 3255 spin_unlock(&ifp->lock);
6732bade 3256 read_unlock_bh(&idev->lock);
3c21edbd 3257 /*
590a9887 3258 * If the device is not ready:
3c21edbd
YH		 3259 * - keep it tentative if it is a permanent address.
3260 * - otherwise, kill it.
3261 */
3262 in6_ifa_hold(ifp);
cc411d0b 3263 addrconf_dad_stop(ifp, 0);
6732bade 3264 return;
3c21edbd 3265 }
95c385b4
NH		 3266
3267 /*
3268 * Optimistic nodes can start receiving
3269 * Frames right away
3270 */
7fd2561e 3271 if (ifp->flags & IFA_F_OPTIMISTIC) {
95c385b4 3272 ip6_ins_rt(ifp->rt);
7fd2561e
EK		 3273 if (ipv6_use_optimistic_addr(idev)) {
3274 /* Because optimistic nodes can use this address,
3275 * notify listeners. If DAD fails, RTM_DELADDR is sent.
3276 */
3277 ipv6_ifa_notify(RTM_NEWADDR, ifp);
3278 }
3279 }
95c385b4 3280
6732bade 3281 addrconf_dad_kick(ifp);
1da177e4 3282out:
622ccdf1 3283 spin_unlock(&ifp->lock);
1da177e4
LT		 3284 read_unlock_bh(&idev->lock);
3285}
3286
c15b1cca 3287static void addrconf_dad_start(struct inet6_ifaddr *ifp)
1da177e4 3288{
c15b1cca
HFS		 3289 bool begin_dad = false;
3290
3291 spin_lock_bh(&ifp->state_lock);
3292 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
3293 ifp->state = INET6_IFADDR_STATE_PREDAD;
3294 begin_dad = true;
3295 }
3296 spin_unlock_bh(&ifp->state_lock);
3297
3298 if (begin_dad)
3299 addrconf_mod_dad_work(ifp, 0);
3300}
3301
3302static void addrconf_dad_work(struct work_struct *w)
3303{
3304 struct inet6_ifaddr *ifp = container_of(to_delayed_work(w),
3305 struct inet6_ifaddr,
3306 dad_work);
1da177e4 3307 struct inet6_dev *idev = ifp->idev;
1da177e4
LT		 3308 struct in6_addr mcaddr;
3309
c15b1cca
HFS		 3310 enum {
3311 DAD_PROCESS,
3312 DAD_BEGIN,
3313 DAD_ABORT,
3314 } action = DAD_PROCESS;
3315
3316 rtnl_lock();
3317
3318 spin_lock_bh(&ifp->state_lock);
3319 if (ifp->state == INET6_IFADDR_STATE_PREDAD) {
3320 action = DAD_BEGIN;
3321 ifp->state = INET6_IFADDR_STATE_DAD;
3322 } else if (ifp->state == INET6_IFADDR_STATE_ERRDAD) {
3323 action = DAD_ABORT;
3324 ifp->state = INET6_IFADDR_STATE_POSTDAD;
3325 }
3326 spin_unlock_bh(&ifp->state_lock);
3327
3328 if (action == DAD_BEGIN) {
3329 addrconf_dad_begin(ifp);
3330 goto out;
3331 } else if (action == DAD_ABORT) {
3332 addrconf_dad_stop(ifp, 1);
3333 goto out;
3334 }
3335
b7b1bfce 3336 if (!ifp->dad_probes && addrconf_dad_end(ifp))
f2344a13
HX		 3337 goto out;
3338
c15b1cca 3339 write_lock_bh(&idev->lock);
122e4519 3340 if (idev->dead || !(idev->if_flags & IF_READY)) {
c15b1cca 3341 write_unlock_bh(&idev->lock);
1da177e4
LT		 3342 goto out;
3343 }
21809faf 3344
3345 spin_lock(&ifp->lock);
622ccdf1
HX		 3346 if (ifp->state == INET6_IFADDR_STATE_DEAD) {
3347 spin_unlock(&ifp->lock);
c15b1cca 3348 write_unlock_bh(&idev->lock);
622ccdf1
HX		 3349 goto out;
3350 }
3351
b7b1bfce 3352 if (ifp->dad_probes == 0) {
1da177e4
LT		 3353 /*
3354 * DAD was successful
3355 */
3356
cc411d0b 3357 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
21809faf 3358 spin_unlock(&ifp->lock);
c15b1cca 3359 write_unlock_bh(&idev->lock);
1da177e4
LT		 3360
3361 addrconf_dad_completed(ifp);
3362
3363 goto out;
3364 }
3365
b7b1bfce 3366 ifp->dad_probes--;
c15b1cca
HFS		 3367 addrconf_mod_dad_work(ifp,
3368 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME));
21809faf 3369 spin_unlock(&ifp->lock);
c15b1cca 3370 write_unlock_bh(&idev->lock);
1da177e4
LT		 3371
3372 /* send a neighbour solicitation for our addr */
1da177e4 3373 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
d7aabf22 3374 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &in6addr_any);
1da177e4
LT		 3375out:
3376 in6_ifa_put(ifp);
c15b1cca 3377 rtnl_unlock();
1da177e4
LT		 3378}
3379
11ffff75
HFS		 3380/* ifp->idev must be at least read locked */
3381static bool ipv6_lonely_lladdr(struct inet6_ifaddr *ifp)
3382{
3383 struct inet6_ifaddr *ifpiter;
3384 struct inet6_dev *idev = ifp->idev;
3385
602582ca
HFS		 3386 list_for_each_entry_reverse(ifpiter, &idev->addr_list, if_list) {
3387 if (ifpiter->scope > IFA_LINK)
3388 break;
11ffff75
HFS		 3389 if (ifp != ifpiter && ifpiter->scope == IFA_LINK &&
3390 (ifpiter->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE|
3391 IFA_F_OPTIMISTIC|IFA_F_DADFAILED)) ==
3392 IFA_F_PERMANENT)
3393 return false;
3394 }
3395 return true;
3396}
3397
1da177e4
LT		 3398static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
3399{
e21e8467 3400 struct net_device *dev = ifp->idev->dev;
b7b1bfce 3401 struct in6_addr lladdr;
b173ee48 3402 bool send_rs, send_mld;
b7b1bfce 3403
c15b1cca 3404 addrconf_del_dad_work(ifp);
1da177e4
LT		 3405
3406 /*
3407 * Configure the address for reception. Now it is valid.
3408 */
3409
3410 ipv6_ifa_notify(RTM_NEWADDR, ifp);
3411
026359bc
TA		 3412 /* If added prefix is link local and we are prepared to process
3413 router advertisements, start sending router solicitations.
1da177e4
LT		 3414 */
3415
1ec047eb 3416 read_lock_bh(&ifp->idev->lock);
11ffff75 3417 send_mld = ifp->scope == IFA_LINK && ipv6_lonely_lladdr(ifp);
b173ee48
HFS		 3418 send_rs = send_mld &&
3419 ipv6_accept_ra(ifp->idev) &&
1ec047eb 3420 ifp->idev->cnf.rtr_solicits > 0 &&
b173ee48 3421 (dev->flags&IFF_LOOPBACK) == 0;
1ec047eb
HFS		 3422 read_unlock_bh(&ifp->idev->lock);
3423
b173ee48
HFS		 3424 /* While dad is in progress mld report's source address is in6_addrany.
3425 * Resend with proper ll now.
3426 */
3427 if (send_mld)
3428 ipv6_mc_dad_complete(ifp->idev);
3429
1ec047eb 3430 if (send_rs) {
1da177e4
LT		 3431 /*
3432 * If a host as already performed a random delay
3433 * [...] as part of DAD [...] there is no need
3434 * to delay again before sending the first RS
3435 */
1ec047eb 3436 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
b7b1bfce 3437 return;
1ec047eb 3438 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters);
1da177e4 3439
b7b1bfce
HFS		 3440 write_lock_bh(&ifp->idev->lock);
3441 spin_lock(&ifp->lock);
3442 ifp->idev->rs_probes = 1;
1da177e4 3443 ifp->idev->if_flags |= IF_RS_SENT;
b7b1bfce
HFS		 3444 addrconf_mod_rs_timer(ifp->idev,
3445 ifp->idev->cnf.rtr_solicit_interval);
3446 spin_unlock(&ifp->lock);
3447 write_unlock_bh(&ifp->idev->lock);
1da177e4
LT		 3448 }
3449}
3450
e21e8467
SH		 3451static void addrconf_dad_run(struct inet6_dev *idev)
3452{
c5e33bdd
YH		 3453 struct inet6_ifaddr *ifp;
3454
3455 read_lock_bh(&idev->lock);
502a2ffd 3456 list_for_each_entry(ifp, &idev->addr_list, if_list) {
21809faf 3457 spin_lock(&ifp->lock);
f2344a13
HX		 3458 if (ifp->flags & IFA_F_TENTATIVE &&
3459 ifp->state == INET6_IFADDR_STATE_DAD)
3460 addrconf_dad_kick(ifp);
21809faf 3461 spin_unlock(&ifp->lock);
c5e33bdd
YH		 3462 }
3463 read_unlock_bh(&idev->lock);
3464}
3465
1da177e4
LT		 3466#ifdef CONFIG_PROC_FS
3467struct if6_iter_state {
3c40090a 3468 struct seq_net_private p;
1da177e4 3469 int bucket;
1d578303 3470 int offset;
1da177e4
LT		 3471};
3472
1d578303 3473static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos)
1da177e4
LT		 3474{
3475 struct inet6_ifaddr *ifa = NULL;
3476 struct if6_iter_state *state = seq->private;
1218854a 3477 struct net *net = seq_file_net(seq);
1d578303 3478 int p = 0;
1da177e4 3479
1d578303
MM		 3480 /* initial bucket if pos is 0 */
3481 if (pos == 0) {
3482 state->bucket = 0;
3483 state->offset = 0;
3484 }
3485
3486 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
b67bfe0d 3487 hlist_for_each_entry_rcu_bh(ifa, &inet6_addr_lst[state->bucket],
1d578303 3488 addr_lst) {
9f0d3c27
ED		 3489 if (!net_eq(dev_net(ifa->idev->dev), net))
3490 continue;
1d578303
MM		 3491 /* sync with offset */
3492 if (p < state->offset) {
3493 p++;
3494 continue;
3495 }
3496 state->offset++;
9f0d3c27 3497 return ifa;
1d578303
MM		 3498 }
3499
3500 /* prepare for next bucket */
3501 state->offset = 0;
3502 p = 0;
1da177e4 3503 }
c2e21293 3504 return NULL;
1da177e4
LT		 3505}
3506
c2e21293 3507static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
3508 struct inet6_ifaddr *ifa)
1da177e4
LT		 3509{
3510 struct if6_iter_state *state = seq->private;
1218854a 3511 struct net *net = seq_file_net(seq);
1da177e4 3512
b67bfe0d 3513 hlist_for_each_entry_continue_rcu_bh(ifa, addr_lst) {
9f0d3c27
ED		 3514 if (!net_eq(dev_net(ifa->idev->dev), net))
3515 continue;
1d578303 3516 state->offset++;
9f0d3c27 3517 return ifa;
1d578303 3518 }
3c40090a 3519
c2e21293 3520 while (++state->bucket < IN6_ADDR_HSIZE) {
1d578303 3521 state->offset = 0;
b67bfe0d 3522 hlist_for_each_entry_rcu_bh(ifa,
c2e21293 3523 &inet6_addr_lst[state->bucket], addr_lst) {
9f0d3c27
ED		 3524 if (!net_eq(dev_net(ifa->idev->dev), net))
3525 continue;
1d578303 3526 state->offset++;
9f0d3c27 3527 return ifa;
c2e21293 3528 }
1da177e4 3529 }
3c40090a 3530
c2e21293 3531 return NULL;
1da177e4
LT		 3532}
3533
1da177e4 3534static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
4f70ecca 3535 __acquires(rcu_bh)
1da177e4 3536{
5c578aed 3537 rcu_read_lock_bh();
1d578303 3538 return if6_get_first(seq, *pos);
1da177e4
LT		 3539}
3540
3541static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3542{
3543 struct inet6_ifaddr *ifa;
3544
3545 ifa = if6_get_next(seq, v);
3546 ++*pos;
3547 return ifa;
3548}
3549
3550static void if6_seq_stop(struct seq_file *seq, void *v)
4f70ecca 3551 __releases(rcu_bh)
1da177e4 3552{
5c578aed 3553 rcu_read_unlock_bh();
1da177e4
LT		 3554}
3555
3556static int if6_seq_show(struct seq_file *seq, void *v)
3557{
3558 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
971a351c 3559 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
b071195d 3560 &ifp->addr,
1da177e4
LT		 3561 ifp->idev->dev->ifindex,
3562 ifp->prefix_len,
3563 ifp->scope,
971a351c 3564 (u8) ifp->flags,
1da177e4
LT		 3565 ifp->idev->dev->name);
3566 return 0;
3567}
3568
56b3d975 3569static const struct seq_operations if6_seq_ops = {
1da177e4
LT		 3570 .start = if6_seq_start,
3571 .next = if6_seq_next,
3572 .show = if6_seq_show,
3573 .stop = if6_seq_stop,
3574};
3575
3576static int if6_seq_open(struct inode *inode, struct file *file)
3577{
3c40090a
DL		 3578 return seq_open_net(inode, file, &if6_seq_ops,
3579 sizeof(struct if6_iter_state));
1da177e4
LT		 3580}
3581
9a32144e 3582static const struct file_operations if6_fops = {
1da177e4
LT		 3583 .owner = THIS_MODULE,
3584 .open = if6_seq_open,
3585 .read = seq_read,
3586 .llseek = seq_lseek,
3c40090a 3587 .release = seq_release_net,
1da177e4
LT		 3588};
3589
2c8c1e72 3590static int __net_init if6_proc_net_init(struct net *net)
1da177e4 3591{
d4beaa66 3592 if (!proc_create("if_inet6", S_IRUGO, net->proc_net, &if6_fops))
1da177e4
LT		 3593 return -ENOMEM;
3594 return 0;
3595}
3596
2c8c1e72 3597static void __net_exit if6_proc_net_exit(struct net *net)
3c40090a 3598{
ece31ffd 3599 remove_proc_entry("if_inet6", net->proc_net);
3c40090a
DL		 3600}
3601
3602static struct pernet_operations if6_proc_net_ops = {
67ba4152
IM		 3603 .init = if6_proc_net_init,
3604 .exit = if6_proc_net_exit,
3c40090a
DL		 3605};
3606
3607int __init if6_proc_init(void)
3608{
3609 return register_pernet_subsys(&if6_proc_net_ops);
3610}
3611
1da177e4
LT		 3612void if6_proc_exit(void)
3613{
3c40090a 3614 unregister_pernet_subsys(&if6_proc_net_ops);
1da177e4
LT		 3615}
3616#endif /* CONFIG_PROC_FS */
3617
07a93626 3618#if IS_ENABLED(CONFIG_IPV6_MIP6)
3b9f9a1c 3619/* Check if address is a home address configured on any interface. */
b71d1d42 3620int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr)
3b9f9a1c
NT		 3621{
3622 int ret = 0;
c2e21293 3623 struct inet6_ifaddr *ifp = NULL;
ddbe5032 3624 unsigned int hash = inet6_addr_hash(addr);
c2e21293 3625
5c578aed 3626 rcu_read_lock_bh();
b67bfe0d 3627 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
878628fb 3628 if (!net_eq(dev_net(ifp->idev->dev), net))
389f6612 3629 continue;
caad295f 3630 if (ipv6_addr_equal(&ifp->addr, addr) &&
3b9f9a1c
NT		 3631 (ifp->flags & IFA_F_HOMEADDRESS)) {
3632 ret = 1;
3633 break;
3634 }
3635 }
5c578aed 3636 rcu_read_unlock_bh();
3b9f9a1c
NT		 3637 return ret;
3638}
3639#endif
3640
1da177e4
LT		 3641/*
3642 * Periodic address status verification
3643 */
3644
c15b1cca 3645static void addrconf_verify_rtnl(void)
1da177e4 3646{
b2db7564 3647 unsigned long now, next, next_sec, next_sched;
1da177e4 3648 struct inet6_ifaddr *ifp;
1da177e4
LT		 3649 int i;
3650
c15b1cca
HFS		 3651 ASSERT_RTNL();
3652
5c578aed 3653 rcu_read_lock_bh();
1da177e4 3654 now = jiffies;
b2db7564 3655 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
1da177e4 3656
c15b1cca 3657 cancel_delayed_work(&addr_chk_work);
1da177e4 3658
bcdd553f 3659 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
1da177e4 3660restart:
c15b1cca 3661 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[i], addr_lst) {
1da177e4 3662 unsigned long age;
1da177e4 3663
fad8da3e
YA		 3664 /* When setting preferred_lft to a value not zero or
3665 * infinity, while valid_lft is infinity
3666 * IFA_F_PERMANENT has a non-infinity life time.
3667 */
3668 if ((ifp->flags & IFA_F_PERMANENT) &&
3669 (ifp->prefered_lft == INFINITY_LIFE_TIME))
1da177e4
LT		 3670 continue;
3671
3672 spin_lock(&ifp->lock);
b2db7564
YH		 3673 /* We try to batch several events at once. */
3674 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
1da177e4 3675
8f27ebb9
YH		 3676 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
3677 age >= ifp->valid_lft) {
1da177e4
LT		 3678 spin_unlock(&ifp->lock);
3679 in6_ifa_hold(ifp);
1da177e4
LT		 3680 ipv6_del_addr(ifp);
3681 goto restart;
8f27ebb9
YH		 3682 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
3683 spin_unlock(&ifp->lock);
3684 continue;
1da177e4 3685 } else if (age >= ifp->prefered_lft) {
a1ed0526 3686 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
1da177e4
LT		 3687 int deprecate = 0;
3688
3689 if (!(ifp->flags&IFA_F_DEPRECATED)) {
3690 deprecate = 1;
3691 ifp->flags |= IFA_F_DEPRECATED;
3692 }
3693
fad8da3e
YA		 3694 if ((ifp->valid_lft != INFINITY_LIFE_TIME) &&
3695 (time_before(ifp->tstamp + ifp->valid_lft * HZ, next)))
1da177e4
LT		 3696 next = ifp->tstamp + ifp->valid_lft * HZ;
3697
3698 spin_unlock(&ifp->lock);
3699
3700 if (deprecate) {
3701 in6_ifa_hold(ifp);
1da177e4
LT		 3702
3703 ipv6_ifa_notify(0, ifp);
3704 in6_ifa_put(ifp);
3705 goto restart;
3706 }
1da177e4
LT		 3707 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
3708 !(ifp->flags&IFA_F_TENTATIVE)) {
88949cf4 3709 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
3710 ifp->idev->cnf.dad_transmits *
1f9248e5 3711 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME) / HZ;
88949cf4 3712
1da177e4
LT		 3713 if (age >= ifp->prefered_lft - regen_advance) {
3714 struct inet6_ifaddr *ifpub = ifp->ifpub;
3715 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3716 next = ifp->tstamp + ifp->prefered_lft * HZ;
3717 if (!ifp->regen_count && ifpub) {
3718 ifp->regen_count++;
3719 in6_ifa_hold(ifp);
3720 in6_ifa_hold(ifpub);
3721 spin_unlock(&ifp->lock);
5c578aed 3722
291d809b
HY		 3723 spin_lock(&ifpub->lock);
3724 ifpub->regen_count = 0;
3725 spin_unlock(&ifpub->lock);
1da177e4
LT		 3726 ipv6_create_tempaddr(ifpub, ifp);
3727 in6_ifa_put(ifpub);
3728 in6_ifa_put(ifp);
3729 goto restart;
3730 }
3731 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
3732 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
3733 spin_unlock(&ifp->lock);
1da177e4
LT		 3734 } else {
3735 /* ifp->prefered_lft <= ifp->valid_lft */
3736 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3737 next = ifp->tstamp + ifp->prefered_lft * HZ;
3738 spin_unlock(&ifp->lock);
3739 }
3740 }
1da177e4
LT		 3741 }
3742
b2db7564
YH		 3743 next_sec = round_jiffies_up(next);
3744 next_sched = next;
3745
3746 /* If rounded timeout is accurate enough, accept it. */
3747 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
3748 next_sched = next_sec;
3749
3750 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
3751 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
3752 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
3753
ba3542e1 3754 ADBG(KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
3755 now, next, next_sec, next_sched);
c15b1cca 3756 mod_delayed_work(addrconf_wq, &addr_chk_work, next_sched - now);
5c578aed 3757 rcu_read_unlock_bh();
1da177e4
LT		 3758}
3759
c15b1cca
HFS		 3760static void addrconf_verify_work(struct work_struct *w)
3761{
3762 rtnl_lock();
3763 addrconf_verify_rtnl();
3764 rtnl_unlock();
3765}
3766
3767static void addrconf_verify(void)
3768{
3769 mod_delayed_work(addrconf_wq, &addr_chk_work, 0);
3770}
3771
caeaba79
ND		 3772static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local,
3773 struct in6_addr **peer_pfx)
461d8837
TG		 3774{
3775 struct in6_addr *pfx = NULL;
3776
caeaba79
ND		 3777 *peer_pfx = NULL;
3778
461d8837
TG		 3779 if (addr)
3780 pfx = nla_data(addr);
3781
3782 if (local) {
3783 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
caeaba79
ND		 3784 *peer_pfx = pfx;
3785 pfx = nla_data(local);
461d8837
TG		 3786 }
3787
3788 return pfx;
3789}
3790
ef7c79ed 3791static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
461d8837
TG		 3792 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
3793 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
3794 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
479840ff 3795 [IFA_FLAGS] = { .len = sizeof(u32) },
461d8837
TG		 3796};
3797
1da177e4 3798static int
661d2967 3799inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh)
1da177e4 3800{
3b1e0a65 3801 struct net *net = sock_net(skb->sk);
b933f716
TG		 3802 struct ifaddrmsg *ifm;
3803 struct nlattr *tb[IFA_MAX+1];
caeaba79 3804 struct in6_addr *pfx, *peer_pfx;
6046d5b4 3805 u32 ifa_flags;
b933f716 3806 int err;
1da177e4 3807
b933f716
TG		 3808 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3809 if (err < 0)
3810 return err;
3811
3812 ifm = nlmsg_data(nlh);
caeaba79 3813 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
1da177e4
LT		 3814 if (pfx == NULL)
3815 return -EINVAL;
3816
6046d5b4
HK		 3817 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
3818
3819 /* We ignore other flags so far. */
3820 ifa_flags &= IFA_F_MANAGETEMPADDR;
3821
3822 return inet6_addr_del(net, ifm->ifa_index, ifa_flags, pfx,
3823 ifm->ifa_prefixlen);
1da177e4
LT		 3824}
3825
479840ff 3826static int inet6_addr_modify(struct inet6_ifaddr *ifp, u32 ifa_flags,
55ebaef1 3827 u32 prefered_lft, u32 valid_lft)
081bba5b 3828{
6f704992
YH		 3829 u32 flags;
3830 clock_t expires;
4bed72e4 3831 unsigned long timeout;
53bd6749 3832 bool was_managetempaddr;
5b84efec 3833 bool had_prefixroute;
46d48046 3834
c15b1cca
HFS		 3835 ASSERT_RTNL();
3836
081bba5b
NT		 3837 if (!valid_lft || (prefered_lft > valid_lft))
3838 return -EINVAL;
3839
53bd6749
JP		 3840 if (ifa_flags & IFA_F_MANAGETEMPADDR &&
3841 (ifp->flags & IFA_F_TEMPORARY || ifp->prefix_len != 64))
3842 return -EINVAL;
3843
4bed72e4
YH		 3844 timeout = addrconf_timeout_fixup(valid_lft, HZ);
3845 if (addrconf_finite_timeout(timeout)) {
3846 expires = jiffies_to_clock_t(timeout * HZ);
3847 valid_lft = timeout;
6f704992 3848 flags = RTF_EXPIRES;
4bed72e4
YH		 3849 } else {
3850 expires = 0;
3851 flags = 0;
3852 ifa_flags |= IFA_F_PERMANENT;
6f704992 3853 }
081bba5b 3854
4bed72e4
YH		 3855 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
3856 if (addrconf_finite_timeout(timeout)) {
3857 if (timeout == 0)
3858 ifa_flags |= IFA_F_DEPRECATED;
3859 prefered_lft = timeout;
3860 }
081bba5b
NT		 3861
3862 spin_lock_bh(&ifp->lock);
53bd6749 3863 was_managetempaddr = ifp->flags & IFA_F_MANAGETEMPADDR;
5b84efec
TH		 3864 had_prefixroute = ifp->flags & IFA_F_PERMANENT &&
3865 !(ifp->flags & IFA_F_NOPREFIXROUTE);
53bd6749 3866 ifp->flags &= ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD |
761aac73
TH		 3867 IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
3868 IFA_F_NOPREFIXROUTE);
53bd6749 3869 ifp->flags |= ifa_flags;
081bba5b
NT		 3870 ifp->tstamp = jiffies;
3871 ifp->valid_lft = valid_lft;
3872 ifp->prefered_lft = prefered_lft;
3873
3874 spin_unlock_bh(&ifp->lock);
3875 if (!(ifp->flags&IFA_F_TENTATIVE))
3876 ipv6_ifa_notify(0, ifp);
081bba5b 3877
761aac73
TH		 3878 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) {
3879 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
3880 expires, flags);
5b84efec
TH		 3881 } else if (had_prefixroute) {
3882 enum cleanup_prefix_rt_t action;
3883 unsigned long rt_expires;
3884
3885 write_lock_bh(&ifp->idev->lock);
3886 action = check_cleanup_prefix_route(ifp, &rt_expires);
3887 write_unlock_bh(&ifp->idev->lock);
3888
3889 if (action != CLEANUP_PREFIX_RT_NOP) {
3890 cleanup_prefix_route(ifp, rt_expires,
3891 action == CLEANUP_PREFIX_RT_DEL);
3892 }
761aac73 3893 }
53bd6749
JP		 3894
3895 if (was_managetempaddr || ifp->flags & IFA_F_MANAGETEMPADDR) {
3896 if (was_managetempaddr && !(ifp->flags & IFA_F_MANAGETEMPADDR))
3897 valid_lft = prefered_lft = 0;
3898 manage_tempaddrs(ifp->idev, ifp, valid_lft, prefered_lft,
3899 !was_managetempaddr, jiffies);
3900 }
3901
c15b1cca 3902 addrconf_verify_rtnl();
081bba5b
NT		 3903
3904 return 0;
3905}
3906
1da177e4 3907static int
661d2967 3908inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh)
1da177e4 3909{
3b1e0a65 3910 struct net *net = sock_net(skb->sk);
461d8837
TG		 3911 struct ifaddrmsg *ifm;
3912 struct nlattr *tb[IFA_MAX+1];
caeaba79 3913 struct in6_addr *pfx, *peer_pfx;
7198f8ce
TG		 3914 struct inet6_ifaddr *ifa;
3915 struct net_device *dev;
55ebaef1 3916 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
479840ff 3917 u32 ifa_flags;
461d8837 3918 int err;
1da177e4 3919
461d8837
TG		 3920 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3921 if (err < 0)
3922 return err;
3923
3924 ifm = nlmsg_data(nlh);
caeaba79 3925 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
1da177e4
LT		 3926 if (pfx == NULL)
3927 return -EINVAL;
3928
461d8837 3929 if (tb[IFA_CACHEINFO]) {
0778769d 3930 struct ifa_cacheinfo *ci;
461d8837
TG		 3931
3932 ci = nla_data(tb[IFA_CACHEINFO]);
0778769d 3933 valid_lft = ci->ifa_valid;
461d8837
TG		 3934 preferred_lft = ci->ifa_prefered;
3935 } else {
3936 preferred_lft = INFINITY_LIFE_TIME;
3937 valid_lft = INFINITY_LIFE_TIME;
0778769d
NT		 3938 }
3939
af284937 3940 dev = __dev_get_by_index(net, ifm->ifa_index);
7198f8ce
TG		 3941 if (dev == NULL)
3942 return -ENODEV;
3943
479840ff
JP		 3944 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
3945
55ebaef1 3946 /* We ignore other flags so far. */
761aac73
TH		 3947 ifa_flags &= IFA_F_NODAD | IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
3948 IFA_F_NOPREFIXROUTE;
55ebaef1 3949
1cab3da6 3950 ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
7198f8ce
TG		 3951 if (ifa == NULL) {
3952 /*
3953 * It would be best to check for !NLM_F_CREATE here but
db9c7c39 3954 * userspace already relies on not having to provide this.
7198f8ce 3955 */
caeaba79 3956 return inet6_addr_add(net, ifm->ifa_index, pfx, peer_pfx,
af284937
DL		 3957 ifm->ifa_prefixlen, ifa_flags,
3958 preferred_lft, valid_lft);
081bba5b
NT		 3959 }
3960
7198f8ce
TG		 3961 if (nlh->nlmsg_flags & NLM_F_EXCL ||
3962 !(nlh->nlmsg_flags & NLM_F_REPLACE))
3963 err = -EEXIST;
3964 else
55ebaef1 3965 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
7198f8ce
TG		 3966
3967 in6_ifa_put(ifa);
3968
3969 return err;
1da177e4
LT		 3970}
3971
479840ff 3972static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u32 flags,
101bb229
TG		 3973 u8 scope, int ifindex)
3974{
3975 struct ifaddrmsg *ifm;
3976
3977 ifm = nlmsg_data(nlh);
3978 ifm->ifa_family = AF_INET6;
3979 ifm->ifa_prefixlen = prefixlen;
3980 ifm->ifa_flags = flags;
3981 ifm->ifa_scope = scope;
3982 ifm->ifa_index = ifindex;
3983}
3984
85486af0
TG		 3985static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
3986 unsigned long tstamp, u32 preferred, u32 valid)
3987{
3988 struct ifa_cacheinfo ci;
3989
18a31e1e
TG		 3990 ci.cstamp = cstamp_delta(cstamp);
3991 ci.tstamp = cstamp_delta(tstamp);
85486af0
TG		 3992 ci.ifa_prefered = preferred;
3993 ci.ifa_valid = valid;
3994
3995 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
3996}
3997
101bb229
TG		 3998static inline int rt_scope(int ifa_scope)
3999{
4000 if (ifa_scope & IFA_HOST)
4001 return RT_SCOPE_HOST;
4002 else if (ifa_scope & IFA_LINK)
4003 return RT_SCOPE_LINK;
4004 else if (ifa_scope & IFA_SITE)
4005 return RT_SCOPE_SITE;
4006 else
4007 return RT_SCOPE_UNIVERSE;
4008}
4009
0ab6803b
TG		 4010static inline int inet6_ifaddr_msgsize(void)
4011{
339bf98f 4012 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
caeaba79 4013 + nla_total_size(16) /* IFA_LOCAL */
339bf98f 4014 + nla_total_size(16) /* IFA_ADDRESS */
479840ff
JP		 4015 + nla_total_size(sizeof(struct ifa_cacheinfo))
4016 + nla_total_size(4) /* IFA_FLAGS */;
0ab6803b 4017}
c5396a31 4018
1da177e4 4019static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
15e47304 4020 u32 portid, u32 seq, int event, unsigned int flags)
1da177e4 4021{
1da177e4 4022 struct nlmsghdr *nlh;
85486af0 4023 u32 preferred, valid;
1da177e4 4024
15e47304 4025 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
0ab6803b 4026 if (nlh == NULL)
26932566 4027 return -EMSGSIZE;
0ab6803b 4028
101bb229
TG		 4029 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
4030 ifa->idev->dev->ifindex);
4031
fad8da3e
YA		 4032 if (!((ifa->flags&IFA_F_PERMANENT) &&
4033 (ifa->prefered_lft == INFINITY_LIFE_TIME))) {
85486af0
TG		 4034 preferred = ifa->prefered_lft;
4035 valid = ifa->valid_lft;
4036 if (preferred != INFINITY_LIFE_TIME) {
1da177e4 4037 long tval = (jiffies - ifa->tstamp)/HZ;
a1faa698
JR		 4038 if (preferred > tval)
4039 preferred -= tval;
4040 else
4041 preferred = 0;
f56619fc
BH		 4042 if (valid != INFINITY_LIFE_TIME) {
4043 if (valid > tval)
4044 valid -= tval;
4045 else
4046 valid = 0;
4047 }
1da177e4
LT		 4048 }
4049 } else {
85486af0
TG		 4050 preferred = INFINITY_LIFE_TIME;
4051 valid = INFINITY_LIFE_TIME;
4052 }
4053
7996c799 4054 if (!ipv6_addr_any(&ifa->peer_addr)) {
caeaba79
ND		 4055 if (nla_put(skb, IFA_LOCAL, 16, &ifa->addr) < 0 ||
4056 nla_put(skb, IFA_ADDRESS, 16, &ifa->peer_addr) < 0)
4057 goto error;
4058 } else
4059 if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0)
4060 goto error;
4061
4062 if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0)
4063 goto error;
1da177e4 4064
479840ff
JP		 4065 if (nla_put_u32(skb, IFA_FLAGS, ifa->flags) < 0)
4066 goto error;
4067
053c095a
JB		 4068 nlmsg_end(skb, nlh);
4069 return 0;
caeaba79
ND		 4070
4071error:
4072 nlmsg_cancel(skb, nlh);
4073 return -EMSGSIZE;
1da177e4
LT		 4074}
4075
4076static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
15e47304 4077 u32 portid, u32 seq, int event, u16 flags)
1da177e4 4078{
1da177e4 4079 struct nlmsghdr *nlh;
101bb229
TG		 4080 u8 scope = RT_SCOPE_UNIVERSE;
4081 int ifindex = ifmca->idev->dev->ifindex;
4082
4083 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
4084 scope = RT_SCOPE_SITE;
1da177e4 4085
15e47304 4086 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
0ab6803b 4087 if (nlh == NULL)
26932566 4088 return -EMSGSIZE;
85486af0 4089
0ab6803b
TG		 4090 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
4091 if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 ||
4092 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
26932566
PM		 4093 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
4094 nlmsg_cancel(skb, nlh);
4095 return -EMSGSIZE;
4096 }
85486af0 4097
053c095a
JB		 4098 nlmsg_end(skb, nlh);
4099 return 0;
1da177e4
LT		 4100}
4101
4102static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
15e47304 4103 u32 portid, u32 seq, int event, unsigned int flags)
1da177e4 4104{
1da177e4 4105 struct nlmsghdr *nlh;
101bb229
TG		 4106 u8 scope = RT_SCOPE_UNIVERSE;
4107 int ifindex = ifaca->aca_idev->dev->ifindex;
4108
4109 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
4110 scope = RT_SCOPE_SITE;
1da177e4 4111
15e47304 4112 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
0ab6803b 4113 if (nlh == NULL)
26932566 4114 return -EMSGSIZE;
85486af0 4115
0ab6803b
TG		 4116 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
4117 if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 ||
4118 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
26932566
PM		 4119 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
4120 nlmsg_cancel(skb, nlh);
4121 return -EMSGSIZE;
4122 }
1da177e4 4123
053c095a
JB		 4124 nlmsg_end(skb, nlh);
4125 return 0;
1da177e4
LT		 4126}
4127
e21e8467 4128enum addr_type_t {
1da177e4
LT		 4129 UNICAST_ADDR,
4130 MULTICAST_ADDR,
4131 ANYCAST_ADDR,
4132};
4133
234b27c3
ED		 4134/* called with rcu_read_lock() */
4135static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
4136 struct netlink_callback *cb, enum addr_type_t type,
4137 int s_ip_idx, int *p_ip_idx)
4138{
234b27c3
ED		 4139 struct ifmcaddr6 *ifmca;
4140 struct ifacaddr6 *ifaca;
4141 int err = 1;
4142 int ip_idx = *p_ip_idx;
4143
4144 read_lock_bh(&idev->lock);
4145 switch (type) {
502a2ffd 4146 case UNICAST_ADDR: {
4147 struct inet6_ifaddr *ifa;
4148
234b27c3 4149 /* unicast address incl. temp addr */
502a2ffd 4150 list_for_each_entry(ifa, &idev->addr_list, if_list) {
4151 if (++ip_idx < s_ip_idx)
234b27c3
ED		 4152 continue;
4153 err = inet6_fill_ifaddr(skb, ifa,
15e47304 4154 NETLINK_CB(cb->skb).portid,
234b27c3
ED		 4155 cb->nlh->nlmsg_seq,
4156 RTM_NEWADDR,
4157 NLM_F_MULTI);
053c095a 4158 if (err < 0)
234b27c3 4159 break;
63998ac2 4160 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
234b27c3
ED		 4161 }
4162 break;
502a2ffd 4163 }
234b27c3
ED		 4164 case MULTICAST_ADDR:
4165 /* multicast address */
4166 for (ifmca = idev->mc_list; ifmca;
4167 ifmca = ifmca->next, ip_idx++) {
4168 if (ip_idx < s_ip_idx)
4169 continue;
4170 err = inet6_fill_ifmcaddr(skb, ifmca,
15e47304 4171 NETLINK_CB(cb->skb).portid,
234b27c3
ED		 4172 cb->nlh->nlmsg_seq,
4173 RTM_GETMULTICAST,
4174 NLM_F_MULTI);
053c095a 4175 if (err < 0)
234b27c3
ED		 4176 break;
4177 }
4178 break;
4179 case ANYCAST_ADDR:
4180 /* anycast address */
4181 for (ifaca = idev->ac_list; ifaca;
4182 ifaca = ifaca->aca_next, ip_idx++) {
4183 if (ip_idx < s_ip_idx)
4184 continue;
4185 err = inet6_fill_ifacaddr(skb, ifaca,
15e47304 4186 NETLINK_CB(cb->skb).portid,
234b27c3
ED		 4187 cb->nlh->nlmsg_seq,
4188 RTM_GETANYCAST,
4189 NLM_F_MULTI);
053c095a 4190 if (err < 0)
234b27c3
ED		 4191 break;
4192 }
4193 break;
4194 default:
4195 break;
4196 }
4197 read_unlock_bh(&idev->lock);
4198 *p_ip_idx = ip_idx;
4199 return err;
4200}
4201
1da177e4
LT		 4202static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
4203 enum addr_type_t type)
4204{
234b27c3
ED		 4205 struct net *net = sock_net(skb->sk);
4206 int h, s_h;
1da177e4
LT		 4207 int idx, ip_idx;
4208 int s_idx, s_ip_idx;
1da177e4 4209 struct net_device *dev;
234b27c3
ED		 4210 struct inet6_dev *idev;
4211 struct hlist_head *head;
1ab1457c 4212
234b27c3
ED		 4213 s_h = cb->args[0];
4214 s_idx = idx = cb->args[1];
4215 s_ip_idx = ip_idx = cb->args[2];
5d5619b4 4216
234b27c3 4217 rcu_read_lock();
63998ac2 4218 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ net->dev_base_seq;
234b27c3
ED		 4219 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4220 idx = 0;
4221 head = &net->dev_index_head[h];
b67bfe0d 4222 hlist_for_each_entry_rcu(dev, head, index_hlist) {
234b27c3
ED		 4223 if (idx < s_idx)
4224 goto cont;
4b97efdf 4225 if (h > s_h || idx > s_idx)
234b27c3
ED		 4226 s_ip_idx = 0;
4227 ip_idx = 0;
e21e8467
SH		 4228 idev = __in6_dev_get(dev);
4229 if (!idev)
234b27c3
ED		 4230 goto cont;
4231
4232 if (in6_dump_addrs(idev, skb, cb, type,
7b46a644 4233 s_ip_idx, &ip_idx) < 0)
234b27c3 4234 goto done;
7562f876 4235cont:
234b27c3
ED		 4236 idx++;
4237 }
1da177e4 4238 }
234b27c3
ED		 4239done:
4240 rcu_read_unlock();
4241 cb->args[0] = h;
4242 cb->args[1] = idx;
4243 cb->args[2] = ip_idx;
4244
1da177e4
LT		 4245 return skb->len;
4246}
4247
4248static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
4249{
4250 enum addr_type_t type = UNICAST_ADDR;
b854272b 4251
1da177e4
LT		 4252 return inet6_dump_addr(skb, cb, type);
4253}
4254
4255static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
4256{
4257 enum addr_type_t type = MULTICAST_ADDR;
b854272b 4258
1da177e4
LT		 4259 return inet6_dump_addr(skb, cb, type);
4260}
4261
4262
4263static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
4264{
4265 enum addr_type_t type = ANYCAST_ADDR;
b854272b 4266
1da177e4
LT		 4267 return inet6_dump_addr(skb, cb, type);
4268}
4269
661d2967 4270static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh)
6c223828 4271{
3b1e0a65 4272 struct net *net = sock_net(in_skb->sk);
1b29fc2c
TG		 4273 struct ifaddrmsg *ifm;
4274 struct nlattr *tb[IFA_MAX+1];
caeaba79 4275 struct in6_addr *addr = NULL, *peer;
6c223828
NT		 4276 struct net_device *dev = NULL;
4277 struct inet6_ifaddr *ifa;
4278 struct sk_buff *skb;
6c223828
NT		 4279 int err;
4280
1b29fc2c
TG		 4281 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
4282 if (err < 0)
4283 goto errout;
4284
caeaba79 4285 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer);
1b29fc2c
TG		 4286 if (addr == NULL) {
4287 err = -EINVAL;
4288 goto errout;
6c223828 4289 }
6c223828 4290
1b29fc2c 4291 ifm = nlmsg_data(nlh);
6c223828 4292 if (ifm->ifa_index)
6fda7350 4293 dev = __dev_get_by_index(net, ifm->ifa_index);
6c223828 4294
e21e8467
SH		 4295 ifa = ipv6_get_ifaddr(net, addr, dev, 1);
4296 if (!ifa) {
1b29fc2c
TG		 4297 err = -EADDRNOTAVAIL;
4298 goto errout;
4299 }
6c223828 4300
e21e8467
SH		 4301 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
4302 if (!skb) {
6c223828 4303 err = -ENOBUFS;
1b29fc2c 4304 goto errout_ifa;
6c223828
NT		 4305 }
4306
15e47304 4307 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).portid,
6c223828 4308 nlh->nlmsg_seq, RTM_NEWADDR, 0);
26932566
PM		 4309 if (err < 0) {
4310 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4311 WARN_ON(err == -EMSGSIZE);
4312 kfree_skb(skb);
4313 goto errout_ifa;
4314 }
15e47304 4315 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
1b29fc2c 4316errout_ifa:
6c223828 4317 in6_ifa_put(ifa);
1b29fc2c 4318errout:
6c223828 4319 return err;
6c223828
NT		 4320}
4321
1da177e4
LT		 4322static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
4323{
4324 struct sk_buff *skb;
c346dca1 4325 struct net *net = dev_net(ifa->idev->dev);
5d620266 4326 int err = -ENOBUFS;
1da177e4 4327
0ab6803b 4328 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
5d620266
TG		 4329 if (skb == NULL)
4330 goto errout;
4331
4332 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
26932566
PM		 4333 if (err < 0) {
4334 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4335 WARN_ON(err == -EMSGSIZE);
4336 kfree_skb(skb);
4337 goto errout;
4338 }
1ce85fe4
PNA		 4339 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
4340 return;
5d620266
TG		 4341errout:
4342 if (err < 0)
6fda7350 4343 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
1da177e4
LT		 4344}
4345
b6f99a21 4346static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
1da177e4
LT		 4347 __s32 *array, int bytes)
4348{
04561c1f
TG		 4349 BUG_ON(bytes < (DEVCONF_MAX * 4));
4350
1da177e4
LT		 4351 memset(array, 0, bytes);
4352 array[DEVCONF_FORWARDING] = cnf->forwarding;
4353 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
4354 array[DEVCONF_MTU6] = cnf->mtu6;
4355 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
4356 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
4357 array[DEVCONF_AUTOCONF] = cnf->autoconf;
4358 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
4359 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
93908d19
TG		 4360 array[DEVCONF_RTR_SOLICIT_INTERVAL] =
4361 jiffies_to_msecs(cnf->rtr_solicit_interval);
4362 array[DEVCONF_RTR_SOLICIT_DELAY] =
4363 jiffies_to_msecs(cnf->rtr_solicit_delay);
1da177e4 4364 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
fc4eba58
HFS		 4365 array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] =
4366 jiffies_to_msecs(cnf->mldv1_unsolicited_report_interval);
4367 array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] =
4368 jiffies_to_msecs(cnf->mldv2_unsolicited_report_interval);
1da177e4
LT		 4369 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
4370 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
4371 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
4372 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
4373 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
1da177e4 4374 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
65f5c7c1 4375 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
c4fd30eb 4376 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
930d6ff2
YH		 4377#ifdef CONFIG_IPV6_ROUTER_PREF
4378 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
93908d19
TG		 4379 array[DEVCONF_RTR_PROBE_INTERVAL] =
4380 jiffies_to_msecs(cnf->rtr_probe_interval);
fa03ef38 4381#ifdef CONFIG_IPV6_ROUTE_INFO
09c884d4
YH		 4382 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
4383#endif
930d6ff2 4384#endif
fbea49e1 4385 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
0bcbc926 4386 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
95c385b4
NH		 4387#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4388 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
7fd2561e 4389 array[DEVCONF_USE_OPTIMISTIC] = cnf->use_optimistic;
95c385b4 4390#endif
7bc570c8
YH		 4391#ifdef CONFIG_IPV6_MROUTE
4392 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
4393#endif
778d80be 4394 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
1b34be74 4395 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
c3faca05 4396 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
5cb04436 4397 array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify;
b800c3b9 4398 array[DEVCONF_SUPPRESS_FRAG_NDISC] = cnf->suppress_frag_ndisc;
d9333196 4399 array[DEVCONF_ACCEPT_RA_FROM_LOCAL] = cnf->accept_ra_from_local;
c2943f14 4400 array[DEVCONF_ACCEPT_RA_MTU] = cnf->accept_ra_mtu;
1da177e4
LT		 4401}
4402
b382b191
TG		 4403static inline size_t inet6_ifla6_size(void)
4404{
4405 return nla_total_size(4) /* IFLA_INET6_FLAGS */
4406 + nla_total_size(sizeof(struct ifla_cacheinfo))
4407 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
4408 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
f53adae4
DB		 4409 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
4410 + nla_total_size(sizeof(struct in6_addr)); /* IFLA_INET6_TOKEN */
b382b191
TG		 4411}
4412
339bf98f
TG		 4413static inline size_t inet6_if_nlmsg_size(void)
4414{
4415 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
4416 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
4417 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
4418 + nla_total_size(4) /* IFLA_MTU */
4419 + nla_total_size(4) /* IFLA_LINK */
b382b191 4420 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */
339bf98f 4421}
c5396a31 4422
be281e55 4423static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib,
7d720c3e 4424 int items, int bytes)
7f7d9a6b
HX		 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++)
be281e55 4433 put_unaligned(atomic_long_read(&mib[i]), &stats[i]);
7f7d9a6b
HX		 4434
4435 memset(&stats[items], 0, pad);
4436}
4437
698365fa 4438static inline void __snmp6_fill_stats64(u64 *stats, void __percpu *mib,
4ce3c183
ED		 4439 int items, int bytes, size_t syncpoff)
4440{
4441 int i;
4442 int pad = bytes - sizeof(u64) * items;
4443 BUG_ON(pad < 0);
4444
4445 /* Use put_unaligned() because stats may not be aligned for u64. */
4446 put_unaligned(items, &stats[0]);
4447 for (i = 1; i < items; i++)
4448 put_unaligned(snmp_fold_field64(mib, i, syncpoff), &stats[i]);
4449
4450 memset(&stats[items], 0, pad);
4451}
4452
7f7d9a6b
HX		 4453static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
4454 int bytes)
4455{
e21e8467 4456 switch (attrtype) {
7f7d9a6b 4457 case IFLA_INET6_STATS:
698365fa 4458 __snmp6_fill_stats64(stats, idev->stats.ipv6,
4ce3c183 4459 IPSTATS_MIB_MAX, bytes, offsetof(struct ipstats_mib, syncp));
7f7d9a6b
HX		 4460 break;
4461 case IFLA_INET6_ICMP6STATS:
be281e55 4462 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, ICMP6_MIB_MAX, bytes);
7f7d9a6b
HX		 4463 break;
4464 }
4465}
4466
b382b191
TG		 4467static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev)
4468{
4469 struct nlattr *nla;
4470 struct ifla_cacheinfo ci;
4471
c78679e8
DM		 4472 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags))
4473 goto nla_put_failure;
b382b191 4474 ci.max_reasm_len = IPV6_MAXPLEN;
24912420
DM		 4475 ci.tstamp = cstamp_delta(idev->tstamp);
4476 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time);
1f9248e5 4477 ci.retrans_time = jiffies_to_msecs(NEIGH_VAR(idev->nd_parms, RETRANS_TIME));
c78679e8
DM		 4478 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci))
4479 goto nla_put_failure;
b382b191
TG		 4480 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
4481 if (nla == NULL)
4482 goto nla_put_failure;
4483 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
4484
4485 /* XXX - MC not implemented */
4486
4487 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
4488 if (nla == NULL)
4489 goto nla_put_failure;
4490 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
4491
4492 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
4493 if (nla == NULL)
4494 goto nla_put_failure;
4495 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
4496
f53adae4
DB		 4497 nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr));
4498 if (nla == NULL)
4499 goto nla_put_failure;
bc91b0f0
JP		 4500
4501 if (nla_put_u8(skb, IFLA_INET6_ADDR_GEN_MODE, idev->addr_gen_mode))
4502 goto nla_put_failure;
4503
f53adae4
DB		 4504 read_lock_bh(&idev->lock);
4505 memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla));
4506 read_unlock_bh(&idev->lock);
4507
b382b191
TG		 4508 return 0;
4509
4510nla_put_failure:
4511 return -EMSGSIZE;
4512}
4513
4514static size_t inet6_get_link_af_size(const struct net_device *dev)
4515{
4516 if (!__in6_dev_get(dev))
4517 return 0;
4518
4519 return inet6_ifla6_size();
4520}
4521
4522static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev)
4523{
4524 struct inet6_dev *idev = __in6_dev_get(dev);
4525
4526 if (!idev)
4527 return -ENODATA;
4528
4529 if (inet6_fill_ifla6_attrs(skb, idev) < 0)
4530 return -EMSGSIZE;
4531
4532 return 0;
4533}
4534
f53adae4
DB		 4535static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token)
4536{
f53adae4
DB		 4537 struct inet6_ifaddr *ifp;
4538 struct net_device *dev = idev->dev;
fc403832 4539 bool update_rs = false;
dc848292 4540 struct in6_addr ll_addr;
f53adae4 4541
c15b1cca
HFS		 4542 ASSERT_RTNL();
4543
f53adae4
DB		 4544 if (token == NULL)
4545 return -EINVAL;
4546 if (ipv6_addr_any(token))
4547 return -EINVAL;
4548 if (dev->flags & (IFF_LOOPBACK | IFF_NOARP))
4549 return -EINVAL;
f53adae4
DB		 4550 if (!ipv6_accept_ra(idev))
4551 return -EINVAL;
4552 if (idev->cnf.rtr_solicits <= 0)
4553 return -EINVAL;
4554
4555 write_lock_bh(&idev->lock);
4556
4557 BUILD_BUG_ON(sizeof(token->s6_addr) != 16);
4558 memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8);
4559
4560 write_unlock_bh(&idev->lock);
4561
dc848292
HFS		 4562 if (!idev->dead && (idev->if_flags & IF_READY) &&
4563 !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE |
4564 IFA_F_OPTIMISTIC)) {
fc403832
DB		 4565
4566 /* If we're not ready, then normal ifup will take care
4567 * of this. Otherwise, we need to request our rs here.
4568 */
4569 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters);
4570 update_rs = true;
4571 }
f53adae4
DB		 4572
4573 write_lock_bh(&idev->lock);
fc403832 4574
77ecaace 4575 if (update_rs) {
fc403832 4576 idev->if_flags |= IF_RS_SENT;
77ecaace
HFS		 4577 idev->rs_probes = 1;
4578 addrconf_mod_rs_timer(idev, idev->cnf.rtr_solicit_interval);
4579 }
f53adae4
DB		 4580
4581 /* Well, that's kinda nasty ... */
4582 list_for_each_entry(ifp, &idev->addr_list, if_list) {
4583 spin_lock(&ifp->lock);
617fe29d 4584 if (ifp->tokenized) {
f53adae4
DB		 4585 ifp->valid_lft = 0;
4586 ifp->prefered_lft = 0;
4587 }
4588 spin_unlock(&ifp->lock);
4589 }
4590
4591 write_unlock_bh(&idev->lock);
b2ed64a9 4592 inet6_ifinfo_notify(RTM_NEWLINK, idev);
c15b1cca 4593 addrconf_verify_rtnl();
f53adae4
DB		 4594 return 0;
4595}
4596
11b1f828
DB		 4597static const struct nla_policy inet6_af_policy[IFLA_INET6_MAX + 1] = {
4598 [IFLA_INET6_ADDR_GEN_MODE] = { .type = NLA_U8 },
4599 [IFLA_INET6_TOKEN] = { .len = sizeof(struct in6_addr) },
4600};
4601
4602static int inet6_validate_link_af(const struct net_device *dev,
4603 const struct nlattr *nla)
4604{
4605 struct nlattr *tb[IFLA_INET6_MAX + 1];
4606
4607 if (dev && !__in6_dev_get(dev))
4608 return -EAFNOSUPPORT;
4609
4610 return nla_parse_nested(tb, IFLA_INET6_MAX, nla, inet6_af_policy);
4611}
4612
f53adae4
DB		 4613static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla)
4614{
4615 int err = -EINVAL;
4616 struct inet6_dev *idev = __in6_dev_get(dev);
4617 struct nlattr *tb[IFLA_INET6_MAX + 1];
4618
4619 if (!idev)
4620 return -EAFNOSUPPORT;
4621
4622 if (nla_parse_nested(tb, IFLA_INET6_MAX, nla, NULL) < 0)
4623 BUG();
4624
bc91b0f0 4625 if (tb[IFLA_INET6_TOKEN]) {
f53adae4 4626 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN]));
bc91b0f0
JP		 4627 if (err)
4628 return err;
4629 }
4630
4631 if (tb[IFLA_INET6_ADDR_GEN_MODE]) {
4632 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]);
4633
4634 if (mode != IN6_ADDR_GEN_MODE_EUI64 &&
4635 mode != IN6_ADDR_GEN_MODE_NONE)
4636 return -EINVAL;
4637 idev->addr_gen_mode = mode;
4638 err = 0;
4639 }
f53adae4
DB		 4640
4641 return err;
4642}
4643
1ab1457c 4644static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
15e47304 4645 u32 portid, u32 seq, int event, unsigned int flags)
1da177e4 4646{
04561c1f 4647 struct net_device *dev = idev->dev;
04561c1f
TG		 4648 struct ifinfomsg *hdr;
4649 struct nlmsghdr *nlh;
4650 void *protoinfo;
04561c1f 4651
15e47304 4652 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags);
04561c1f 4653 if (nlh == NULL)
26932566 4654 return -EMSGSIZE;
04561c1f
TG		 4655
4656 hdr = nlmsg_data(nlh);
4657 hdr->ifi_family = AF_INET6;
4658 hdr->__ifi_pad = 0;
4659 hdr->ifi_type = dev->type;
4660 hdr->ifi_index = dev->ifindex;
4661 hdr->ifi_flags = dev_get_flags(dev);
4662 hdr->ifi_change = 0;
4663
c78679e8
DM		 4664 if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
4665 (dev->addr_len &&
4666 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
4667 nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
4668 (dev->ifindex != dev->iflink &&
4669 nla_put_u32(skb, IFLA_LINK, dev->iflink)))
4670 goto nla_put_failure;
04561c1f
TG		 4671 protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
4672 if (protoinfo == NULL)
4673 goto nla_put_failure;
1da177e4 4674
b382b191 4675 if (inet6_fill_ifla6_attrs(skb, idev) < 0)
bf99f1bd 4676 goto nla_put_failure;
1da177e4 4677
04561c1f 4678 nla_nest_end(skb, protoinfo);
053c095a
JB		 4679 nlmsg_end(skb, nlh);
4680 return 0;
1da177e4 4681
04561c1f 4682nla_put_failure:
26932566
PM		 4683 nlmsg_cancel(skb, nlh);
4684 return -EMSGSIZE;
1da177e4
LT		 4685}
4686
4687static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
4688{
3b1e0a65 4689 struct net *net = sock_net(skb->sk);
84d2697d 4690 int h, s_h;
434a8a58 4691 int idx = 0, s_idx;
1da177e4
LT		 4692 struct net_device *dev;
4693 struct inet6_dev *idev;
84d2697d 4694 struct hlist_head *head;
1da177e4 4695
84d2697d
ED		 4696 s_h = cb->args[0];
4697 s_idx = cb->args[1];
4698
4699 rcu_read_lock();
4700 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4701 idx = 0;
4702 head = &net->dev_index_head[h];
b67bfe0d 4703 hlist_for_each_entry_rcu(dev, head, index_hlist) {
84d2697d
ED		 4704 if (idx < s_idx)
4705 goto cont;
4706 idev = __in6_dev_get(dev);
4707 if (!idev)
4708 goto cont;
4709 if (inet6_fill_ifinfo(skb, idev,
15e47304 4710 NETLINK_CB(cb->skb).portid,
84d2697d 4711 cb->nlh->nlmsg_seq,
053c095a 4712 RTM_NEWLINK, NLM_F_MULTI) < 0)
84d2697d 4713 goto out;
7562f876 4714cont:
84d2697d
ED		 4715 idx++;
4716 }
1da177e4 4717 }
84d2697d
ED		 4718out:
4719 rcu_read_unlock();
4720 cb->args[1] = idx;
4721 cb->args[0] = h;
1da177e4
LT		 4722
4723 return skb->len;
4724}
4725
4726void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
4727{
4728 struct sk_buff *skb;
c346dca1 4729 struct net *net = dev_net(idev->dev);
8d7a76c9 4730 int err = -ENOBUFS;
1ab1457c 4731
339bf98f 4732 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
8d7a76c9
TG		 4733 if (skb == NULL)
4734 goto errout;
4735
4736 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
26932566
PM		 4737 if (err < 0) {
4738 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
4739 WARN_ON(err == -EMSGSIZE);
4740 kfree_skb(skb);
4741 goto errout;
4742 }
5f75a104 4743 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC);
1ce85fe4 4744 return;
8d7a76c9
TG		 4745errout:
4746 if (err < 0)
5f75a104 4747 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err);
1da177e4
LT		 4748}
4749
339bf98f
TG		 4750static inline size_t inet6_prefix_nlmsg_size(void)
4751{
4752 return NLMSG_ALIGN(sizeof(struct prefixmsg))
4753 + nla_total_size(sizeof(struct in6_addr))
4754 + nla_total_size(sizeof(struct prefix_cacheinfo));
4755}
c5396a31 4756
1da177e4 4757static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
15e47304 4758 struct prefix_info *pinfo, u32 portid, u32 seq,
6051e2f4 4759 int event, unsigned int flags)
1da177e4 4760{
6051e2f4
TG		 4761 struct prefixmsg *pmsg;
4762 struct nlmsghdr *nlh;
1da177e4
LT		 4763 struct prefix_cacheinfo ci;
4764
15e47304 4765 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags);
6051e2f4 4766 if (nlh == NULL)
26932566 4767 return -EMSGSIZE;
6051e2f4
TG		 4768
4769 pmsg = nlmsg_data(nlh);
1da177e4 4770 pmsg->prefix_family = AF_INET6;
8a47077a
PM		 4771 pmsg->prefix_pad1 = 0;
4772 pmsg->prefix_pad2 = 0;
1da177e4
LT		 4773 pmsg->prefix_ifindex = idev->dev->ifindex;
4774 pmsg->prefix_len = pinfo->prefix_len;
4775 pmsg->prefix_type = pinfo->type;
8a47077a 4776 pmsg->prefix_pad3 = 0;
1da177e4
LT		 4777 pmsg->prefix_flags = 0;
4778 if (pinfo->onlink)
4779 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
4780 if (pinfo->autoconf)
4781 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
4782
c78679e8
DM		 4783 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix))
4784 goto nla_put_failure;
1da177e4
LT		 4785 ci.preferred_time = ntohl(pinfo->prefered);
4786 ci.valid_time = ntohl(pinfo->valid);
c78679e8
DM		 4787 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci))
4788 goto nla_put_failure;
053c095a
JB		 4789 nlmsg_end(skb, nlh);
4790 return 0;
1da177e4 4791
6051e2f4 4792nla_put_failure:
26932566
PM		 4793 nlmsg_cancel(skb, nlh);
4794 return -EMSGSIZE;
1da177e4
LT		 4795}
4796
1ab1457c 4797static void inet6_prefix_notify(int event, struct inet6_dev *idev,
1da177e4
LT		 4798 struct prefix_info *pinfo)
4799{
4800 struct sk_buff *skb;
c346dca1 4801 struct net *net = dev_net(idev->dev);
8c384bfa 4802 int err = -ENOBUFS;
1da177e4 4803
339bf98f 4804 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
8c384bfa
TG		 4805 if (skb == NULL)
4806 goto errout;
4807
4808 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
26932566
PM		 4809 if (err < 0) {
4810 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
4811 WARN_ON(err == -EMSGSIZE);
4812 kfree_skb(skb);
4813 goto errout;
4814 }
1ce85fe4
PNA		 4815 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
4816 return;
8c384bfa
TG		 4817errout:
4818 if (err < 0)
6fda7350 4819 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
1da177e4
LT		 4820}
4821
1da177e4
LT		 4822static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4823{
63998ac2
ND		 4824 struct net *net = dev_net(ifp->idev->dev);
4825
c15b1cca
HFS		 4826 if (event)
4827 ASSERT_RTNL();
4828
1da177e4
LT		 4829 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
4830
4831 switch (event) {
4832 case RTM_NEWADDR:
95c385b4
NH		 4833 /*
4834 * If the address was optimistic
4835 * we inserted the route at the start of
4836 * our DAD process, so we don't need
4837 * to do it again
4838 */
4839 if (!(ifp->rt->rt6i_node))
4840 ip6_ins_rt(ifp->rt);
1da177e4
LT		 4841 if (ifp->idev->cnf.forwarding)
4842 addrconf_join_anycast(ifp);
7996c799 4843 if (!ipv6_addr_any(&ifp->peer_addr))
caeaba79
ND		 4844 addrconf_prefix_route(&ifp->peer_addr, 128,
4845 ifp->idev->dev, 0, 0);
1da177e4
LT		 4846 break;
4847 case RTM_DELADDR:
4848 if (ifp->idev->cnf.forwarding)
4849 addrconf_leave_anycast(ifp);
4850 addrconf_leave_solict(ifp->idev, &ifp->addr);
7996c799 4851 if (!ipv6_addr_any(&ifp->peer_addr)) {
caeaba79 4852 struct rt6_info *rt;
caeaba79 4853
e7478dfc
ND		 4854 rt = addrconf_get_prefix_route(&ifp->peer_addr, 128,
4855 ifp->idev->dev, 0, 0);
f24062b0
ND		 4856 if (rt && ip6_del_rt(rt))
4857 dst_free(&rt->dst);
caeaba79 4858 }
d8d1f30b 4859 dst_hold(&ifp->rt->dst);
93fa159a 4860
73a8bd74 4861 if (ip6_del_rt(ifp->rt))
d8d1f30b 4862 dst_free(&ifp->rt->dst);
705f1c86
HFS		 4863
4864 rt_genid_bump_ipv6(net);
1da177e4
LT		 4865 break;
4866 }
63998ac2 4867 atomic_inc(&net->ipv6.dev_addr_genid);
1da177e4
LT		 4868}
4869
4870static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4871{
8814c4b5 4872 rcu_read_lock_bh();
1da177e4
LT		 4873 if (likely(ifp->idev->dead == 0))
4874 __ipv6_ifa_notify(event, ifp);
8814c4b5 4875 rcu_read_unlock_bh();
1da177e4
LT		 4876}
4877
4878#ifdef CONFIG_SYSCTL
4879
4880static
fe2c6338 4881int addrconf_sysctl_forward(struct ctl_table *ctl, int write,
1da177e4
LT		 4882 void __user *buffer, size_t *lenp, loff_t *ppos)
4883{
4884 int *valp = ctl->data;
4885 int val = *valp;
88af182e 4886 loff_t pos = *ppos;
fe2c6338 4887 struct ctl_table lctl;
1da177e4
LT		 4888 int ret;
4889
013d97e9
FR		 4890 /*
4891 * ctl->data points to idev->cnf.forwarding, we should
4892 * not modify it until we get the rtnl lock.
4893 */
4894 lctl = *ctl;
4895 lctl.data = &val;
4896
4897 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
1da177e4 4898
c8fecf22 4899 if (write)
b325fddb 4900 ret = addrconf_fixup_forwarding(ctl, valp, val);
88af182e
EB		 4901 if (ret)
4902 *ppos = pos;
1ab1457c 4903 return ret;
1da177e4
LT		 4904}
4905
77751427
ML		 4906static
4907int addrconf_sysctl_mtu(struct ctl_table *ctl, int write,
4908 void __user *buffer, size_t *lenp, loff_t *ppos)
4909{
4910 struct inet6_dev *idev = ctl->extra1;
4911 int min_mtu = IPV6_MIN_MTU;
4912 struct ctl_table lctl;
4913
4914 lctl = *ctl;
4915 lctl.extra1 = &min_mtu;
4916 lctl.extra2 = idev ? &idev->dev->mtu : NULL;
4917
4918 return proc_dointvec_minmax(&lctl, write, buffer, lenp, ppos);
4919}
4920
56d417b1
BH		 4921static void dev_disable_change(struct inet6_dev *idev)
4922{
75538c2b
CW		 4923 struct netdev_notifier_info info;
4924
56d417b1
BH		 4925 if (!idev || !idev->dev)
4926 return;
4927
75538c2b 4928 netdev_notifier_info_init(&info, idev->dev);
56d417b1 4929 if (idev->cnf.disable_ipv6)
75538c2b 4930 addrconf_notify(NULL, NETDEV_DOWN, &info);
56d417b1 4931 else
75538c2b 4932 addrconf_notify(NULL, NETDEV_UP, &info);
56d417b1
BH		 4933}
4934
4935static void addrconf_disable_change(struct net *net, __s32 newf)
4936{
4937 struct net_device *dev;
4938 struct inet6_dev *idev;
4939
c6d14c84
ED		 4940 rcu_read_lock();
4941 for_each_netdev_rcu(net, dev) {
56d417b1
BH		 4942 idev = __in6_dev_get(dev);
4943 if (idev) {
4944 int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
4945 idev->cnf.disable_ipv6 = newf;
4946 if (changed)
4947 dev_disable_change(idev);
4948 }
56d417b1 4949 }
c6d14c84 4950 rcu_read_unlock();
56d417b1
BH		 4951}
4952
013d97e9 4953static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf)
56d417b1
BH		 4954{
4955 struct net *net;
013d97e9
FR		 4956 int old;
4957
4958 if (!rtnl_trylock())
4959 return restart_syscall();
56d417b1
BH		 4960
4961 net = (struct net *)table->extra2;
013d97e9
FR		 4962 old = *p;
4963 *p = newf;
56d417b1 4964
013d97e9
FR		 4965 if (p == &net->ipv6.devconf_dflt->disable_ipv6) {
4966 rtnl_unlock();
56d417b1 4967 return 0;
88af182e 4968 }
56d417b1
BH		 4969
4970 if (p == &net->ipv6.devconf_all->disable_ipv6) {
56d417b1
BH		 4971 net->ipv6.devconf_dflt->disable_ipv6 = newf;
4972 addrconf_disable_change(net, newf);
013d97e9 4973 } else if ((!newf) ^ (!old))
56d417b1
BH		 4974 dev_disable_change((struct inet6_dev *)table->extra1);
4975
4976 rtnl_unlock();
4977 return 0;
4978}
4979
4980static
fe2c6338 4981int addrconf_sysctl_disable(struct ctl_table *ctl, int write,
56d417b1
BH		 4982 void __user *buffer, size_t *lenp, loff_t *ppos)
4983{
4984 int *valp = ctl->data;
4985 int val = *valp;
88af182e 4986 loff_t pos = *ppos;
fe2c6338 4987 struct ctl_table lctl;
56d417b1
BH		 4988 int ret;
4989
013d97e9
FR		 4990 /*
4991 * ctl->data points to idev->cnf.disable_ipv6, we should
4992 * not modify it until we get the rtnl lock.
4993 */
4994 lctl = *ctl;
4995 lctl.data = &val;
4996
4997 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
56d417b1
BH		 4998
4999 if (write)
5000 ret = addrconf_disable_ipv6(ctl, valp, val);
88af182e
EB		 5001 if (ret)
5002 *ppos = pos;
56d417b1
BH		 5003 return ret;
5004}
5005
c92d5491 5006static
5007int addrconf_sysctl_proxy_ndp(struct ctl_table *ctl, int write,
5008 void __user *buffer, size_t *lenp, loff_t *ppos)
5009{
5010 int *valp = ctl->data;
5011 int ret;
5012 int old, new;
5013
5014 old = *valp;
5015 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
5016 new = *valp;
5017
5018 if (write && old != new) {
5019 struct net *net = ctl->extra2;
5020
5021 if (!rtnl_trylock())
5022 return restart_syscall();
5023
5024 if (valp == &net->ipv6.devconf_dflt->proxy_ndp)
5025 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
5026 NETCONFA_IFINDEX_DEFAULT,
5027 net->ipv6.devconf_dflt);
5028 else if (valp == &net->ipv6.devconf_all->proxy_ndp)
5029 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
5030 NETCONFA_IFINDEX_ALL,
5031 net->ipv6.devconf_all);
5032 else {
5033 struct inet6_dev *idev = ctl->extra1;
5034
5035 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
5036 idev->dev->ifindex,
5037 &idev->cnf);
5038 }
5039 rtnl_unlock();
5040 }
5041
5042 return ret;
5043}
5044
5045
1da177e4
LT		 5046static struct addrconf_sysctl_table
5047{
5048 struct ctl_table_header *sysctl_header;
fe2c6338 5049 struct ctl_table addrconf_vars[DEVCONF_MAX+1];
ab32ea5d 5050} addrconf_sysctl __read_mostly = {
1da177e4
LT		 5051 .sysctl_header = NULL,
5052 .addrconf_vars = {
1ab1457c 5053 {
e21e8467
SH		 5054 .procname = "forwarding",
5055 .data = &ipv6_devconf.forwarding,
5056 .maxlen = sizeof(int),
5057 .mode = 0644,
5058 .proc_handler = addrconf_sysctl_forward,
1da177e4
LT		 5059 },
5060 {
e21e8467
SH		 5061 .procname = "hop_limit",
5062 .data = &ipv6_devconf.hop_limit,
5063 .maxlen = sizeof(int),
5064 .mode = 0644,
5065 .proc_handler = proc_dointvec,
1da177e4
LT		 5066 },
5067 {
e21e8467
SH		 5068 .procname = "mtu",
5069 .data = &ipv6_devconf.mtu6,
5070 .maxlen = sizeof(int),
5071 .mode = 0644,
77751427 5072 .proc_handler = addrconf_sysctl_mtu,
1da177e4
LT		 5073 },
5074 {
e21e8467
SH		 5075 .procname = "accept_ra",
5076 .data = &ipv6_devconf.accept_ra,
5077 .maxlen = sizeof(int),
5078 .mode = 0644,
5079 .proc_handler = proc_dointvec,
1da177e4
LT		 5080 },
5081 {
e21e8467
SH		 5082 .procname = "accept_redirects",
5083 .data = &ipv6_devconf.accept_redirects,
5084 .maxlen = sizeof(int),
5085 .mode = 0644,
5086 .proc_handler = proc_dointvec,
1da177e4
LT		 5087 },
5088 {
e21e8467
SH		 5089 .procname = "autoconf",
5090 .data = &ipv6_devconf.autoconf,
5091 .maxlen = sizeof(int),
5092 .mode = 0644,
5093 .proc_handler = proc_dointvec,
1da177e4
LT		 5094 },
5095 {
e21e8467
SH		 5096 .procname = "dad_transmits",
5097 .data = &ipv6_devconf.dad_transmits,
5098 .maxlen = sizeof(int),
5099 .mode = 0644,
5100 .proc_handler = proc_dointvec,
1da177e4
LT		 5101 },
5102 {
e21e8467
SH		 5103 .procname = "router_solicitations",
5104 .data = &ipv6_devconf.rtr_solicits,
5105 .maxlen = sizeof(int),
5106 .mode = 0644,
5107 .proc_handler = proc_dointvec,
1da177e4
LT		 5108 },
5109 {
e21e8467
SH		 5110 .procname = "router_solicitation_interval",
5111 .data = &ipv6_devconf.rtr_solicit_interval,
5112 .maxlen = sizeof(int),
5113 .mode = 0644,
5114 .proc_handler = proc_dointvec_jiffies,
1da177e4
LT		 5115 },
5116 {
e21e8467
SH		 5117 .procname = "router_solicitation_delay",
5118 .data = &ipv6_devconf.rtr_solicit_delay,
5119 .maxlen = sizeof(int),
5120 .mode = 0644,
5121 .proc_handler = proc_dointvec_jiffies,
1da177e4
LT		 5122 },
5123 {
e21e8467
SH		 5124 .procname = "force_mld_version",
5125 .data = &ipv6_devconf.force_mld_version,
5126 .maxlen = sizeof(int),
5127 .mode = 0644,
5128 .proc_handler = proc_dointvec,
1da177e4 5129 },
fc4eba58
HFS		 5130 {
5131 .procname = "mldv1_unsolicited_report_interval",
5132 .data =
5133 &ipv6_devconf.mldv1_unsolicited_report_interval,
5134 .maxlen = sizeof(int),
5135 .mode = 0644,
5136 .proc_handler = proc_dointvec_ms_jiffies,
5137 },
5138 {
5139 .procname = "mldv2_unsolicited_report_interval",
5140 .data =
5141 &ipv6_devconf.mldv2_unsolicited_report_interval,
5142 .maxlen = sizeof(int),
5143 .mode = 0644,
5144 .proc_handler = proc_dointvec_ms_jiffies,
5145 },
1da177e4 5146 {
e21e8467
SH		 5147 .procname = "use_tempaddr",
5148 .data = &ipv6_devconf.use_tempaddr,
5149 .maxlen = sizeof(int),
5150 .mode = 0644,
5151 .proc_handler = proc_dointvec,
1da177e4
LT		 5152 },
5153 {
e21e8467
SH		 5154 .procname = "temp_valid_lft",
5155 .data = &ipv6_devconf.temp_valid_lft,
5156 .maxlen = sizeof(int),
5157 .mode = 0644,
5158 .proc_handler = proc_dointvec,
1da177e4
LT		 5159 },
5160 {
e21e8467
SH		 5161 .procname = "temp_prefered_lft",
5162 .data = &ipv6_devconf.temp_prefered_lft,
5163 .maxlen = sizeof(int),
5164 .mode = 0644,
5165 .proc_handler = proc_dointvec,
1da177e4
LT		 5166 },
5167 {
e21e8467
SH		 5168 .procname = "regen_max_retry",
5169 .data = &ipv6_devconf.regen_max_retry,
5170 .maxlen = sizeof(int),
5171 .mode = 0644,
5172 .proc_handler = proc_dointvec,
1da177e4
LT		 5173 },
5174 {
e21e8467
SH		 5175 .procname = "max_desync_factor",
5176 .data = &ipv6_devconf.max_desync_factor,
5177 .maxlen = sizeof(int),
5178 .mode = 0644,
5179 .proc_handler = proc_dointvec,
1da177e4 5180 },
1da177e4 5181 {
e21e8467
SH		 5182 .procname = "max_addresses",
5183 .data = &ipv6_devconf.max_addresses,
5184 .maxlen = sizeof(int),
5185 .mode = 0644,
5186 .proc_handler = proc_dointvec,
1da177e4 5187 },
65f5c7c1 5188 {
e21e8467
SH		 5189 .procname = "accept_ra_defrtr",
5190 .data = &ipv6_devconf.accept_ra_defrtr,
5191 .maxlen = sizeof(int),
5192 .mode = 0644,
5193 .proc_handler = proc_dointvec,
65f5c7c1 5194 },
c4fd30eb 5195 {
e21e8467
SH		 5196 .procname = "accept_ra_pinfo",
5197 .data = &ipv6_devconf.accept_ra_pinfo,
5198 .maxlen = sizeof(int),
5199 .mode = 0644,
5200 .proc_handler = proc_dointvec,
c4fd30eb 5201 },
930d6ff2
YH		 5202#ifdef CONFIG_IPV6_ROUTER_PREF
5203 {
e21e8467
SH		 5204 .procname = "accept_ra_rtr_pref",
5205 .data = &ipv6_devconf.accept_ra_rtr_pref,
5206 .maxlen = sizeof(int),
5207 .mode = 0644,
5208 .proc_handler = proc_dointvec,
930d6ff2 5209 },
52e16356 5210 {
e21e8467
SH		 5211 .procname = "router_probe_interval",
5212 .data = &ipv6_devconf.rtr_probe_interval,
5213 .maxlen = sizeof(int),
5214 .mode = 0644,
5215 .proc_handler = proc_dointvec_jiffies,
52e16356 5216 },
fa03ef38 5217#ifdef CONFIG_IPV6_ROUTE_INFO
09c884d4 5218 {
e21e8467
SH		 5219 .procname = "accept_ra_rt_info_max_plen",
5220 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
5221 .maxlen = sizeof(int),
5222 .mode = 0644,
5223 .proc_handler = proc_dointvec,
09c884d4
YH		 5224 },
5225#endif
930d6ff2 5226#endif
fbea49e1 5227 {
e21e8467
SH		 5228 .procname = "proxy_ndp",
5229 .data = &ipv6_devconf.proxy_ndp,
5230 .maxlen = sizeof(int),
5231 .mode = 0644,
c92d5491 5232 .proc_handler = addrconf_sysctl_proxy_ndp,
fbea49e1 5233 },
0bcbc926 5234 {
e21e8467
SH		 5235 .procname = "accept_source_route",
5236 .data = &ipv6_devconf.accept_source_route,
5237 .maxlen = sizeof(int),
5238 .mode = 0644,
5239 .proc_handler = proc_dointvec,
0bcbc926 5240 },
95c385b4
NH		 5241#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
5242 {
e21e8467
SH		 5243 .procname = "optimistic_dad",
5244 .data = &ipv6_devconf.optimistic_dad,
5245 .maxlen = sizeof(int),
5246 .mode = 0644,
5247 .proc_handler = proc_dointvec,
95c385b4
NH		 5248
5249 },
7fd2561e
EK		 5250 {
5251 .procname = "use_optimistic",
5252 .data = &ipv6_devconf.use_optimistic,
5253 .maxlen = sizeof(int),
5254 .mode = 0644,
5255 .proc_handler = proc_dointvec,
5256
5257 },
7bc570c8
YH		 5258#endif
5259#ifdef CONFIG_IPV6_MROUTE
5260 {
e21e8467
SH		 5261 .procname = "mc_forwarding",
5262 .data = &ipv6_devconf.mc_forwarding,
5263 .maxlen = sizeof(int),
5264 .mode = 0444,
5265 .proc_handler = proc_dointvec,
7bc570c8 5266 },
95c385b4 5267#endif
778d80be 5268 {
e21e8467
SH		 5269 .procname = "disable_ipv6",
5270 .data = &ipv6_devconf.disable_ipv6,
5271 .maxlen = sizeof(int),
5272 .mode = 0644,
5273 .proc_handler = addrconf_sysctl_disable,
778d80be 5274 },
1b34be74 5275 {
e21e8467
SH		 5276 .procname = "accept_dad",
5277 .data = &ipv6_devconf.accept_dad,
5278 .maxlen = sizeof(int),
5279 .mode = 0644,
5280 .proc_handler = proc_dointvec,
1b34be74 5281 },
f7734fdf 5282 {
f7734fdf
OP		 5283 .procname = "force_tllao",
5284 .data = &ipv6_devconf.force_tllao,
5285 .maxlen = sizeof(int),
5286 .mode = 0644,
5287 .proc_handler = proc_dointvec
5288 },
5cb04436
HFS		 5289 {
5290 .procname = "ndisc_notify",
5291 .data = &ipv6_devconf.ndisc_notify,
5292 .maxlen = sizeof(int),
5293 .mode = 0644,
5294 .proc_handler = proc_dointvec
5295 },
b800c3b9
HFS		 5296 {
5297 .procname = "suppress_frag_ndisc",
5298 .data = &ipv6_devconf.suppress_frag_ndisc,
5299 .maxlen = sizeof(int),
5300 .mode = 0644,
5301 .proc_handler = proc_dointvec
5302 },
d9333196
BG		 5303 {
5304 .procname = "accept_ra_from_local",
5305 .data = &ipv6_devconf.accept_ra_from_local,
5306 .maxlen = sizeof(int),
5307 .mode = 0644,
5308 .proc_handler = proc_dointvec,
5309 },
c2943f14
HH		 5310 {
5311 .procname = "accept_ra_mtu",
5312 .data = &ipv6_devconf.accept_ra_mtu,
5313 .maxlen = sizeof(int),
5314 .mode = 0644,
5315 .proc_handler = proc_dointvec,
5316 },
1da177e4 5317 {
f8572d8f 5318 /* sentinel */
1da177e4
LT		 5319 }
5320 },
1da177e4
LT		 5321};
5322
bff16c2f 5323static int __addrconf_sysctl_register(struct net *net, char *dev_name,
f8572d8f 5324 struct inet6_dev *idev, struct ipv6_devconf *p)
1da177e4
LT		 5325{
5326 int i;
1da177e4 5327 struct addrconf_sysctl_table *t;
6105e293 5328 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ];
1dab6222 5329
af879cc7 5330 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
1da177e4 5331 if (t == NULL)
f68635e6
PE		 5332 goto out;
5333
bcdd553f 5334 for (i = 0; t->addrconf_vars[i].data; i++) {
e21e8467 5335 t->addrconf_vars[i].data += (char *)p - (char *)&ipv6_devconf;
1da177e4 5336 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
bff16c2f 5337 t->addrconf_vars[i].extra2 = net;
1da177e4 5338 }
1da177e4 5339
6105e293 5340 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name);
1da177e4 5341
6105e293 5342 t->sysctl_header = register_net_sysctl(net, path, t->addrconf_vars);
1da177e4 5343 if (t->sysctl_header == NULL)
6105e293 5344 goto free;
f68635e6
PE		 5345
5346 p->sysctl = t;
95897312 5347 return 0;
1da177e4 5348
f68635e6 5349free:
1da177e4 5350 kfree(t);
f68635e6 5351out:
95897312 5352 return -ENOBUFS;
1da177e4
LT		 5353}
5354
408c4768
PE		 5355static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
5356{
5357 struct addrconf_sysctl_table *t;
5358
5359 if (p->sysctl == NULL)
5360 return;
5361
5362 t = p->sysctl;
5363 p->sysctl = NULL;
ff538818 5364 unregister_net_sysctl_table(t->sysctl_header);
408c4768
PE		 5365 kfree(t);
5366}
5367
a317a2f1 5368static int addrconf_sysctl_register(struct inet6_dev *idev)
f52295a9 5369{
a317a2f1
WC		 5370 int err;
5371
5372 if (!sysctl_dev_name_is_allowed(idev->dev->name))
5373 return -EINVAL;
5374
5375 err = neigh_sysctl_register(idev->dev, idev->nd_parms,
5376 &ndisc_ifinfo_sysctl_change);
5377 if (err)
5378 return err;
5379 err = __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
5380 idev, &idev->cnf);
5381 if (err)
5382 neigh_sysctl_unregister(idev->nd_parms);
5383
5384 return err;
f52295a9
PE		 5385}
5386
408c4768 5387static void addrconf_sysctl_unregister(struct inet6_dev *idev)
1da177e4 5388{
408c4768
PE		 5389 __addrconf_sysctl_unregister(&idev->cnf);
5390 neigh_sysctl_unregister(idev->nd_parms);
1da177e4
LT		 5391}
5392
5393
5394#endif
5395
2c8c1e72 5396static int __net_init addrconf_init_net(struct net *net)
e0da5a48 5397{
a79ca223 5398 int err = -ENOMEM;
e0da5a48
PE		 5399 struct ipv6_devconf *all, *dflt;
5400
a79ca223
HZ		 5401 all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL);
5402 if (all == NULL)
5403 goto err_alloc_all;
e0da5a48 5404
a79ca223
HZ		 5405 dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
5406 if (dflt == NULL)
5407 goto err_alloc_dflt;
e0da5a48 5408
a79ca223
HZ		 5409 /* these will be inherited by all namespaces */
5410 dflt->autoconf = ipv6_defaults.autoconf;
5411 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
e0da5a48
PE		 5412
5413 net->ipv6.devconf_all = all;
5414 net->ipv6.devconf_dflt = dflt;
5415
5416#ifdef CONFIG_SYSCTL
f8572d8f 5417 err = __addrconf_sysctl_register(net, "all", NULL, all);
e0da5a48
PE		 5418 if (err < 0)
5419 goto err_reg_all;
5420
f8572d8f 5421 err = __addrconf_sysctl_register(net, "default", NULL, dflt);
e0da5a48
PE		 5422 if (err < 0)
5423 goto err_reg_dflt;
5424#endif
5425 return 0;
5426
5427#ifdef CONFIG_SYSCTL
5428err_reg_dflt:
5429 __addrconf_sysctl_unregister(all);
5430err_reg_all:
5431 kfree(dflt);
5432#endif
5433err_alloc_dflt:
5434 kfree(all);
5435err_alloc_all:
5436 return err;
5437}
5438
2c8c1e72 5439static void __net_exit addrconf_exit_net(struct net *net)
e0da5a48
PE		 5440{
5441#ifdef CONFIG_SYSCTL
5442 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
5443 __addrconf_sysctl_unregister(net->ipv6.devconf_all);
5444#endif
73cf0e92 5445 kfree(net->ipv6.devconf_dflt);
5446 kfree(net->ipv6.devconf_all);
e0da5a48
PE		 5447}
5448
5449static struct pernet_operations addrconf_ops = {
5450 .init = addrconf_init_net,
5451 .exit = addrconf_exit_net,
5452};
5453
207895fd 5454static struct rtnl_af_ops inet6_ops __read_mostly = {
b382b191
TG		 5455 .family = AF_INET6,
5456 .fill_link_af = inet6_fill_link_af,
5457 .get_link_af_size = inet6_get_link_af_size,
11b1f828 5458 .validate_link_af = inet6_validate_link_af,
f53adae4 5459 .set_link_af = inet6_set_link_af,
b382b191
TG		 5460};
5461
1da177e4
LT		 5462/*
5463 * Init / cleanup code
5464 */
5465
5466int __init addrconf_init(void)
5467{
a317a2f1 5468 struct inet6_dev *idev;
c2e21293 5469 int i, err;
2a8cc6c8 5470
e21e8467
SH		 5471 err = ipv6_addr_label_init();
5472 if (err < 0) {
f3213831
JP		 5473 pr_crit("%s: cannot initialize default policy table: %d\n",
5474 __func__, err);
2cc6d2bf 5475 goto out;
2a8cc6c8 5476 }
1da177e4 5477
2cc6d2bf
NH		 5478 err = register_pernet_subsys(&addrconf_ops);
5479 if (err < 0)
5480 goto out_addrlabel;
e0da5a48 5481
c15b1cca
HFS		 5482 addrconf_wq = create_workqueue("ipv6_addrconf");
5483 if (!addrconf_wq) {
5484 err = -ENOMEM;
5485 goto out_nowq;
5486 }
5487
1da177e4
LT		 5488 /* The addrconf netdev notifier requires that loopback_dev
5489 * has it's ipv6 private information allocated and setup
5490 * before it can bring up and give link-local addresses
5491 * to other devices which are up.
5492 *
5493 * Unfortunately, loopback_dev is not necessarily the first
5494 * entry in the global dev_base list of net devices. In fact,
5495 * it is likely to be the very last entry on that list.
5496 * So this causes the notifier registry below to try and
5497 * give link-local addresses to all devices besides loopback_dev
5498 * first, then loopback_dev, which cases all the non-loopback_dev
5499 * devices to fail to get a link-local address.
5500 *
5501 * So, as a temporary fix, allocate the ipv6 structure for
5502 * loopback_dev first by hand.
5503 * Longer term, all of the dependencies ipv6 has upon the loopback
5504 * device and it being up should be removed.
5505 */
5506 rtnl_lock();
a317a2f1 5507 idev = ipv6_add_dev(init_net.loopback_dev);
1da177e4 5508 rtnl_unlock();
a317a2f1
WC		 5509 if (IS_ERR(idev)) {
5510 err = PTR_ERR(idev);
e0da5a48 5511 goto errlo;
a317a2f1 5512 }
1da177e4 5513
c2e21293 5514 for (i = 0; i < IN6_ADDR_HSIZE; i++)
5515 INIT_HLIST_HEAD(&inet6_addr_lst[i]);
5516
1da177e4
LT		 5517 register_netdevice_notifier(&ipv6_dev_notf);
5518
c15b1cca 5519 addrconf_verify();
c127ea2c 5520
3678a9d8 5521 rtnl_af_register(&inet6_ops);
b382b191 5522
c7ac8679
GR		 5523 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo,
5524 NULL);
c127ea2c
TG		 5525 if (err < 0)
5526 goto errout;
5527
5528 /* Only the first call to __rtnl_register can fail */
c7ac8679
GR		 5529 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL, NULL);
5530 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL, NULL);
5531 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr,
5532 inet6_dump_ifaddr, NULL);
5533 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL,
5534 inet6_dump_ifmcaddr, NULL);
5535 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL,
5536 inet6_dump_ifacaddr, NULL);
76f8f6cb 5537 __rtnl_register(PF_INET6, RTM_GETNETCONF, inet6_netconf_get_devconf,
7a674200 5538 inet6_netconf_dump_devconf, NULL);
c127ea2c 5539
2a8cc6c8
YH		 5540 ipv6_addr_label_rtnl_register();
5541
1da177e4 5542 return 0;
c127ea2c 5543errout:
b382b191 5544 rtnl_af_unregister(&inet6_ops);
c127ea2c 5545 unregister_netdevice_notifier(&ipv6_dev_notf);
e0da5a48 5546errlo:
c15b1cca
HFS		 5547 destroy_workqueue(addrconf_wq);
5548out_nowq:
e0da5a48 5549 unregister_pernet_subsys(&addrconf_ops);
2cc6d2bf
NH		 5550out_addrlabel:
5551 ipv6_addr_label_cleanup();
5552out:
c127ea2c 5553 return err;
1da177e4
LT		 5554}
5555
09f7709f 5556void addrconf_cleanup(void)
1da177e4 5557{
176c39af 5558 struct net_device *dev;
1da177e4
LT		 5559 int i;
5560
5561 unregister_netdevice_notifier(&ipv6_dev_notf);
e0da5a48 5562 unregister_pernet_subsys(&addrconf_ops);
2cc6d2bf 5563 ipv6_addr_label_cleanup();
1da177e4
LT		 5564
5565 rtnl_lock();
5566
b382b191
TG		 5567 __rtnl_af_unregister(&inet6_ops);
5568
176c39af
DL		 5569 /* clean dev list */
5570 for_each_netdev(&init_net, dev) {
5571 if (__in6_dev_get(dev) == NULL)
5572 continue;
5573 addrconf_ifdown(dev, 1);
5574 }
5575 addrconf_ifdown(init_net.loopback_dev, 2);
5576
1da177e4
LT		 5577 /*
5578 * Check hash table.
5579 */
5c578aed 5580 spin_lock_bh(&addrconf_hash_lock);
c2e21293 5581 for (i = 0; i < IN6_ADDR_HSIZE; i++)
5582 WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
5c578aed 5583 spin_unlock_bh(&addrconf_hash_lock);
c15b1cca 5584 cancel_delayed_work(&addr_chk_work);
1da177e4 5585 rtnl_unlock();
c15b1cca
HFS		 5586
5587 destroy_workqueue(addrconf_wq);
1da177e4 5588}
Linux kernel - Deliverables
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