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Merge branch 'linus' of git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6
[linux-2.6-block.git] / net / ipv6 / addrconf.c
CommitLineData
1da177e4
LT		 1/*
2 * IPv6 Address [auto]configuration
3 * Linux INET6 implementation
4 *
5 * Authors:
1ab1457c 6 * Pedro Roque <roque@di.fc.ul.pt>
1da177e4
LT		 7 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
8 *
1da177e4
LT		 9 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License
11 * as published by the Free Software Foundation; either version
12 * 2 of the License, or (at your option) any later version.
13 */
14
15/*
16 * Changes:
17 *
18 * Janos Farkas : delete timer on ifdown
19 * <chexum@bankinf.banki.hu>
20 * Andi Kleen : kill double kfree on module
21 * unload.
22 * Maciej W. Rozycki : FDDI support
23 * sekiya@USAGI : Don't send too many RS
24 * packets.
25 * yoshfuji@USAGI : Fixed interval between DAD
26 * packets.
27 * YOSHIFUJI Hideaki @USAGI : improved accuracy of
28 * address validation timer.
29 * YOSHIFUJI Hideaki @USAGI : Privacy Extensions (RFC3041)
30 * support.
31 * Yuji SEKIYA @USAGI : Don't assign a same IPv6
32 * address on a same interface.
33 * YOSHIFUJI Hideaki @USAGI : ARCnet support
34 * YOSHIFUJI Hideaki @USAGI : convert /proc/net/if_inet6 to
35 * seq_file.
b1cacb68
YH		 36 * YOSHIFUJI Hideaki @USAGI : improved source address
37 * selection; consider scope,
38 * status etc.
1da177e4
LT		 39 */
40
f3213831
JP		 41#define pr_fmt(fmt) "IPv6: " fmt
42
1da177e4
LT		 43#include <linux/errno.h>
44#include <linux/types.h>
a0bffffc 45#include <linux/kernel.h>
1da177e4
LT		 46#include <linux/socket.h>
47#include <linux/sockios.h>
1da177e4 48#include <linux/net.h>
3d1bec99 49#include <linux/inet.h>
1da177e4
LT		 50#include <linux/in6.h>
51#include <linux/netdevice.h>
1823730f 52#include <linux/if_addr.h>
1da177e4
LT		 53#include <linux/if_arp.h>
54#include <linux/if_arcnet.h>
55#include <linux/if_infiniband.h>
56#include <linux/route.h>
57#include <linux/inetdevice.h>
58#include <linux/init.h>
5a0e3ad6 59#include <linux/slab.h>
1da177e4
LT		 60#ifdef CONFIG_SYSCTL
61#include <linux/sysctl.h>
62#endif
4fc268d2 63#include <linux/capability.h>
1da177e4
LT		 64#include <linux/delay.h>
65#include <linux/notifier.h>
543537bd 66#include <linux/string.h>
ddbe5032 67#include <linux/hash.h>
1da177e4 68
457c4cbc 69#include <net/net_namespace.h>
1da177e4
LT		 70#include <net/sock.h>
71#include <net/snmp.h>
72
06a4c1c5 73#include <net/af_ieee802154.h>
cb6bf355 74#include <net/firewire.h>
1da177e4
LT		 75#include <net/ipv6.h>
76#include <net/protocol.h>
77#include <net/ndisc.h>
78#include <net/ip6_route.h>
79#include <net/addrconf.h>
80#include <net/tcp.h>
81#include <net/ip.h>
5d620266 82#include <net/netlink.h>
f24e3d65 83#include <net/pkt_sched.h>
ca254490 84#include <net/l3mdev.h>
1da177e4
LT		 85#include <linux/if_tunnel.h>
86#include <linux/rtnetlink.h>
f3a1bfb1 87#include <linux/netconf.h>
1da177e4 88#include <linux/random.h>
e21e8467 89#include <linux/uaccess.h>
7f7d9a6b 90#include <asm/unaligned.h>
1da177e4
LT		 91
92#include <linux/proc_fs.h>
93#include <linux/seq_file.h>
bc3b2d7f 94#include <linux/export.h>
1da177e4
LT		 95
96/* Set to 3 to get tracing... */
97#define ACONF_DEBUG 2
98
99#if ACONF_DEBUG >= 3
ba3542e1 100#define ADBG(fmt, ...) printk(fmt, ##__VA_ARGS__)
1da177e4 101#else
ba3542e1 102#define ADBG(fmt, ...) do { if (0) printk(fmt, ##__VA_ARGS__); } while (0)
1da177e4
LT		 103#endif
104
105#define INFINITY_LIFE_TIME 0xFFFFFFFF
18a31e1e 106
3d1bec99
HFS		 107#define IPV6_MAX_STRLEN \
108 sizeof("ffff:ffff:ffff:ffff:ffff:ffff:255.255.255.255")
109
18a31e1e
TG		 110static inline u32 cstamp_delta(unsigned long cstamp)
111{
112 return (cstamp - INITIAL_JIFFIES) * 100UL / HZ;
113}
1da177e4
LT		 114
115#ifdef CONFIG_SYSCTL
a317a2f1 116static int addrconf_sysctl_register(struct inet6_dev *idev);
408c4768
PE		 117static void addrconf_sysctl_unregister(struct inet6_dev *idev);
118#else
a317a2f1 119static inline int addrconf_sysctl_register(struct inet6_dev *idev)
408c4768 120{
a317a2f1 121 return 0;
408c4768
PE		 122}
123
124static inline void addrconf_sysctl_unregister(struct inet6_dev *idev)
125{
126}
1da177e4
LT		 127#endif
128
eb7e0575
SD		 129static void __ipv6_regen_rndid(struct inet6_dev *idev);
130static void __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
1da177e4 131static void ipv6_regen_rndid(unsigned long data);
1da177e4 132
1b34be74 133static int ipv6_generate_eui64(u8 *eui, struct net_device *dev);
1da177e4 134static int ipv6_count_addresses(struct inet6_dev *idev);
622c81d5
HFS		 135static int ipv6_generate_stable_address(struct in6_addr *addr,
136 u8 dad_count,
137 const struct inet6_dev *idev);
1da177e4
LT		 138
139/*
140 * Configured unicast address hash table
141 */
c2e21293 142static struct hlist_head inet6_addr_lst[IN6_ADDR_HSIZE];
5c578aed 143static DEFINE_SPINLOCK(addrconf_hash_lock);
1da177e4 144
c15b1cca
HFS		 145static void addrconf_verify(void);
146static void addrconf_verify_rtnl(void);
147static void addrconf_verify_work(struct work_struct *);
1da177e4 148
c15b1cca
HFS		 149static struct workqueue_struct *addrconf_wq;
150static DECLARE_DELAYED_WORK(addr_chk_work, addrconf_verify_work);
1da177e4
LT		 151
152static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
153static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
154
93d9b7d7
JP		 155static void addrconf_type_change(struct net_device *dev,
156 unsigned long event);
1da177e4
LT		 157static int addrconf_ifdown(struct net_device *dev, int how);
158
21caa662
RK		 159static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
160 int plen,
161 const struct net_device *dev,
162 u32 flags, u32 noflags);
163
cf22f9a2 164static void addrconf_dad_start(struct inet6_ifaddr *ifp);
c15b1cca 165static void addrconf_dad_work(struct work_struct *w);
1da177e4 166static void addrconf_dad_completed(struct inet6_ifaddr *ifp);
c5e33bdd 167static void addrconf_dad_run(struct inet6_dev *idev);
1da177e4
LT		 168static void addrconf_rs_timer(unsigned long data);
169static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
170static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
171
1ab1457c 172static void inet6_prefix_notify(int event, struct inet6_dev *idev,
1da177e4 173 struct prefix_info *pinfo);
3e81c6da
DM		 174static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
175 struct net_device *dev);
1da177e4 176
888c848e 177static struct ipv6_devconf ipv6_devconf __read_mostly = {
1da177e4
LT		 178 .forwarding = 0,
179 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
180 .mtu6 = IPV6_MIN_MTU,
181 .accept_ra = 1,
182 .accept_redirects = 1,
183 .autoconf = 1,
184 .force_mld_version = 0,
fc4eba58
HFS		 185 .mldv1_unsolicited_report_interval = 10 * HZ,
186 .mldv2_unsolicited_report_interval = HZ,
1da177e4
LT		 187 .dad_transmits = 1,
188 .rtr_solicits = MAX_RTR_SOLICITATIONS,
189 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
190 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
67ba4152 191 .use_tempaddr = 0,
1da177e4
LT		 192 .temp_valid_lft = TEMP_VALID_LIFETIME,
193 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
194 .regen_max_retry = REGEN_MAX_RETRY,
195 .max_desync_factor = MAX_DESYNC_FACTOR,
1da177e4 196 .max_addresses = IPV6_MAX_ADDRESSES,
65f5c7c1 197 .accept_ra_defrtr = 1,
d9333196 198 .accept_ra_from_local = 0,
8013d1d7 199 .accept_ra_min_hop_limit= 1,
c4fd30eb 200 .accept_ra_pinfo = 1,
930d6ff2
YH		 201#ifdef CONFIG_IPV6_ROUTER_PREF
202 .accept_ra_rtr_pref = 1,
52e16356 203 .rtr_probe_interval = 60 * HZ,
09c884d4
YH		 204#ifdef CONFIG_IPV6_ROUTE_INFO
205 .accept_ra_rt_info_max_plen = 0,
206#endif
930d6ff2 207#endif
fbea49e1 208 .proxy_ndp = 0,
0bcbc926 209 .accept_source_route = 0, /* we do not accept RH0 by default. */
778d80be 210 .disable_ipv6 = 0,
1b34be74 211 .accept_dad = 1,
b800c3b9 212 .suppress_frag_ndisc = 1,
c2943f14 213 .accept_ra_mtu = 1,
3d1bec99
HFS		 214 .stable_secret = {
215 .initialized = false,
3985e8a3
EK		 216 },
217 .use_oif_addrs_only = 0,
35103d11 218 .ignore_routes_with_linkdown = 0,
1da177e4
LT		 219};
220
ab32ea5d 221static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
1da177e4
LT		 222 .forwarding = 0,
223 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
224 .mtu6 = IPV6_MIN_MTU,
225 .accept_ra = 1,
226 .accept_redirects = 1,
227 .autoconf = 1,
fc4eba58
HFS		 228 .force_mld_version = 0,
229 .mldv1_unsolicited_report_interval = 10 * HZ,
230 .mldv2_unsolicited_report_interval = HZ,
1da177e4
LT		 231 .dad_transmits = 1,
232 .rtr_solicits = MAX_RTR_SOLICITATIONS,
233 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
234 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
1da177e4
LT		 235 .use_tempaddr = 0,
236 .temp_valid_lft = TEMP_VALID_LIFETIME,
237 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
238 .regen_max_retry = REGEN_MAX_RETRY,
239 .max_desync_factor = MAX_DESYNC_FACTOR,
1da177e4 240 .max_addresses = IPV6_MAX_ADDRESSES,
65f5c7c1 241 .accept_ra_defrtr = 1,
d9333196 242 .accept_ra_from_local = 0,
8013d1d7 243 .accept_ra_min_hop_limit= 1,
c4fd30eb 244 .accept_ra_pinfo = 1,
930d6ff2
YH		 245#ifdef CONFIG_IPV6_ROUTER_PREF
246 .accept_ra_rtr_pref = 1,
52e16356 247 .rtr_probe_interval = 60 * HZ,
09c884d4
YH		 248#ifdef CONFIG_IPV6_ROUTE_INFO
249 .accept_ra_rt_info_max_plen = 0,
250#endif
930d6ff2 251#endif
fbea49e1 252 .proxy_ndp = 0,
0bcbc926 253 .accept_source_route = 0, /* we do not accept RH0 by default. */
778d80be 254 .disable_ipv6 = 0,
1b34be74 255 .accept_dad = 1,
b800c3b9 256 .suppress_frag_ndisc = 1,
c2943f14 257 .accept_ra_mtu = 1,
3d1bec99
HFS		 258 .stable_secret = {
259 .initialized = false,
260 },
3985e8a3 261 .use_oif_addrs_only = 0,
35103d11 262 .ignore_routes_with_linkdown = 0,
1da177e4
LT		 263};
264
f24e3d65 265/* Check if a valid qdisc is available */
05297949 266static inline bool addrconf_qdisc_ok(const struct net_device *dev)
f24e3d65 267{
05297949 268 return !qdisc_tx_is_noop(dev);
f24e3d65
MC		 269}
270
b7b1bfce 271static void addrconf_del_rs_timer(struct inet6_dev *idev)
1da177e4 272{
b7b1bfce
HFS		 273 if (del_timer(&idev->rs_timer))
274 __in6_dev_put(idev);
275}
276
c15b1cca 277static void addrconf_del_dad_work(struct inet6_ifaddr *ifp)
b7b1bfce 278{
c15b1cca 279 if (cancel_delayed_work(&ifp->dad_work))
1da177e4
LT		 280 __in6_ifa_put(ifp);
281}
282
b7b1bfce
HFS		 283static void addrconf_mod_rs_timer(struct inet6_dev *idev,
284 unsigned long when)
285{
286 if (!timer_pending(&idev->rs_timer))
287 in6_dev_hold(idev);
288 mod_timer(&idev->rs_timer, jiffies + when);
289}
1da177e4 290
c15b1cca
HFS		 291static void addrconf_mod_dad_work(struct inet6_ifaddr *ifp,
292 unsigned long delay)
1da177e4 293{
c15b1cca 294 if (!delayed_work_pending(&ifp->dad_work))
1da177e4 295 in6_ifa_hold(ifp);
c15b1cca 296 mod_delayed_work(addrconf_wq, &ifp->dad_work, delay);
1da177e4
LT		 297}
298
7f7d9a6b
HX		 299static int snmp6_alloc_dev(struct inet6_dev *idev)
300{
827da44c
JS		 301 int i;
302
698365fa
WC		 303 idev->stats.ipv6 = alloc_percpu(struct ipstats_mib);
304 if (!idev->stats.ipv6)
7f7d9a6b 305 goto err_ip;
827da44c
JS		 306
307 for_each_possible_cpu(i) {
308 struct ipstats_mib *addrconf_stats;
698365fa 309 addrconf_stats = per_cpu_ptr(idev->stats.ipv6, i);
827da44c 310 u64_stats_init(&addrconf_stats->syncp);
827da44c
JS		 311 }
312
313
be281e55
ED		 314 idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device),
315 GFP_KERNEL);
316 if (!idev->stats.icmpv6dev)
7f7d9a6b 317 goto err_icmp;
be281e55
ED		 318 idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device),
319 GFP_KERNEL);
320 if (!idev->stats.icmpv6msgdev)
14878f75 321 goto err_icmpmsg;
7f7d9a6b
HX		 322
323 return 0;
324
14878f75 325err_icmpmsg:
be281e55 326 kfree(idev->stats.icmpv6dev);
7f7d9a6b 327err_icmp:
698365fa 328 free_percpu(idev->stats.ipv6);
7f7d9a6b 329err_ip:
aaf70ec7 330 return -ENOMEM;
7f7d9a6b
HX		 331}
332
8e5e8f30 333static struct inet6_dev *ipv6_add_dev(struct net_device *dev)
1da177e4
LT		 334{
335 struct inet6_dev *ndev;
a317a2f1 336 int err = -ENOMEM;
1da177e4
LT		 337
338 ASSERT_RTNL();
339
340 if (dev->mtu < IPV6_MIN_MTU)
a317a2f1 341 return ERR_PTR(-EINVAL);
1da177e4 342
1ab1457c 343 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
63159f29 344 if (!ndev)
a317a2f1 345 return ERR_PTR(err);
322f74a4
IO		 346
347 rwlock_init(&ndev->lock);
348 ndev->dev = dev;
502a2ffd 349 INIT_LIST_HEAD(&ndev->addr_list);
b7b1bfce
HFS		 350 setup_timer(&ndev->rs_timer, addrconf_rs_timer,
351 (unsigned long)ndev);
c346dca1 352 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf));
322f74a4
IO		 353 ndev->cnf.mtu6 = dev->mtu;
354 ndev->cnf.sysctl = NULL;
355 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
63159f29 356 if (!ndev->nd_parms) {
322f74a4 357 kfree(ndev);
a317a2f1 358 return ERR_PTR(err);
322f74a4 359 }
0187bdfb
BH		 360 if (ndev->cnf.forwarding)
361 dev_disable_lro(dev);
322f74a4
IO		 362 /* We refer to the device */
363 dev_hold(dev);
1da177e4 364
322f74a4 365 if (snmp6_alloc_dev(ndev) < 0) {
ba3542e1 366 ADBG(KERN_WARNING
f3213831 367 "%s: cannot allocate memory for statistics; dev=%s.\n",
ba3542e1 368 __func__, dev->name);
322f74a4 369 neigh_parms_release(&nd_tbl, ndev->nd_parms);
8603e33d
RL		 370 dev_put(dev);
371 kfree(ndev);
a317a2f1 372 return ERR_PTR(err);
322f74a4 373 }
1da177e4 374
322f74a4 375 if (snmp6_register_dev(ndev) < 0) {
ba3542e1 376 ADBG(KERN_WARNING
f3213831 377 "%s: cannot create /proc/net/dev_snmp6/%s\n",
ba3542e1 378 __func__, dev->name);
a317a2f1 379 goto err_release;
322f74a4
IO		 380 }
381
382 /* One reference from device. We must do this before
383 * we invoke __ipv6_regen_rndid().
384 */
385 in6_dev_hold(ndev);
1da177e4 386
1b34be74
YH		 387 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
388 ndev->cnf.accept_dad = -1;
389
07a93626 390#if IS_ENABLED(CONFIG_IPV6_SIT)
b077d7ab 391 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
f3213831 392 pr_info("%s: Disabled Multicast RS\n", dev->name);
b077d7ab
YH		 393 ndev->cnf.rtr_solicits = 0;
394 }
395#endif
396
372e6c8f 397 INIT_LIST_HEAD(&ndev->tempaddr_list);
b24b8a24 398 setup_timer(&ndev->regen_timer, ipv6_regen_rndid, (unsigned long)ndev);
322f74a4
IO		 399 if ((dev->flags&IFF_LOOPBACK) ||
400 dev->type == ARPHRD_TUNNEL ||
9625ed72 401 dev->type == ARPHRD_TUNNEL6 ||
0be669bb 402 dev->type == ARPHRD_SIT ||
0be669bb 403 dev->type == ARPHRD_NONE) {
322f74a4
IO		 404 ndev->cnf.use_tempaddr = -1;
405 } else {
406 in6_dev_hold(ndev);
407 ipv6_regen_rndid((unsigned long) ndev);
408 }
5d9efa7e 409
914faa14 410 ndev->token = in6addr_any;
1da177e4 411
f24e3d65 412 if (netif_running(dev) && addrconf_qdisc_ok(dev))
53aadcc9
HX		 413 ndev->if_flags |= IF_READY;
414
322f74a4
IO		 415 ipv6_mc_init_dev(ndev);
416 ndev->tstamp = jiffies;
a317a2f1
WC		 417 err = addrconf_sysctl_register(ndev);
418 if (err) {
419 ipv6_mc_destroy_dev(ndev);
420 del_timer(&ndev->regen_timer);
2a189f9e 421 snmp6_unregister_dev(ndev);
a317a2f1
WC		 422 goto err_release;
423 }
30c4cf57 424 /* protected by rtnl_lock */
cf778b00 425 rcu_assign_pointer(dev->ip6_ptr, ndev);
d88ae4cc 426
2c5e8933
HFS		 427 /* Join interface-local all-node multicast group */
428 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allnodes);
429
d88ae4cc 430 /* Join all-node multicast group */
f3ee4010 431 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);
d88ae4cc 432
d6ddef9e 433 /* Join all-router multicast group if forwarding is set */
8b2aaede 434 if (ndev->cnf.forwarding && (dev->flags & IFF_MULTICAST))
d6ddef9e
LW		 435 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
436
1da177e4 437 return ndev;
a317a2f1
WC		 438
439err_release:
440 neigh_parms_release(&nd_tbl, ndev->nd_parms);
441 ndev->dead = 1;
442 in6_dev_finish_destroy(ndev);
443 return ERR_PTR(err);
1da177e4
LT		 444}
445
8e5e8f30 446static struct inet6_dev *ipv6_find_idev(struct net_device *dev)
1da177e4
LT		 447{
448 struct inet6_dev *idev;
449
450 ASSERT_RTNL();
451
e21e8467
SH		 452 idev = __in6_dev_get(dev);
453 if (!idev) {
454 idev = ipv6_add_dev(dev);
a317a2f1 455 if (IS_ERR(idev))
1da177e4
LT		 456 return NULL;
457 }
c5e33bdd 458
1da177e4
LT		 459 if (dev->flags&IFF_UP)
460 ipv6_mc_up(idev);
461 return idev;
462}
463
f3a1bfb1
ND		 464static int inet6_netconf_msgsize_devconf(int type)
465{
466 int size = NLMSG_ALIGN(sizeof(struct netconfmsg))
467 + nla_total_size(4); /* NETCONFA_IFINDEX */
468
76f8f6cb
ND		 469 /* type -1 is used for ALL */
470 if (type == -1 || type == NETCONFA_FORWARDING)
f3a1bfb1 471 size += nla_total_size(4);
b1afce95 472#ifdef CONFIG_IPV6_MROUTE
d67b8c61
ND		 473 if (type == -1 || type == NETCONFA_MC_FORWARDING)
474 size += nla_total_size(4);
b1afce95 475#endif
c92d5491 476 if (type == -1 || type == NETCONFA_PROXY_NEIGH)
477 size += nla_total_size(4);
f3a1bfb1 478
35103d11
AG		 479 if (type == -1 || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN)
480 size += nla_total_size(4);
481
f3a1bfb1
ND		 482 return size;
483}
484
485static int inet6_netconf_fill_devconf(struct sk_buff *skb, int ifindex,
486 struct ipv6_devconf *devconf, u32 portid,
487 u32 seq, int event, unsigned int flags,
488 int type)
489{
490 struct nlmsghdr *nlh;
491 struct netconfmsg *ncm;
492
493 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg),
494 flags);
63159f29 495 if (!nlh)
f3a1bfb1
ND		 496 return -EMSGSIZE;
497
498 ncm = nlmsg_data(nlh);
499 ncm->ncm_family = AF_INET6;
500
501 if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0)
502 goto nla_put_failure;
503
76f8f6cb
ND		 504 /* type -1 is used for ALL */
505 if ((type == -1 || type == NETCONFA_FORWARDING) &&
f3a1bfb1
ND		 506 nla_put_s32(skb, NETCONFA_FORWARDING, devconf->forwarding) < 0)
507 goto nla_put_failure;
b1afce95 508#ifdef CONFIG_IPV6_MROUTE
d67b8c61
ND		 509 if ((type == -1 || type == NETCONFA_MC_FORWARDING) &&
510 nla_put_s32(skb, NETCONFA_MC_FORWARDING,
511 devconf->mc_forwarding) < 0)
512 goto nla_put_failure;
b1afce95 513#endif
c92d5491 514 if ((type == -1 || type == NETCONFA_PROXY_NEIGH) &&
515 nla_put_s32(skb, NETCONFA_PROXY_NEIGH, devconf->proxy_ndp) < 0)
516 goto nla_put_failure;
517
35103d11
AG		 518 if ((type == -1 || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN) &&
519 nla_put_s32(skb, NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
520 devconf->ignore_routes_with_linkdown) < 0)
521 goto nla_put_failure;
522
053c095a
JB		 523 nlmsg_end(skb, nlh);
524 return 0;
f3a1bfb1
ND		 525
526nla_put_failure:
527 nlmsg_cancel(skb, nlh);
528 return -EMSGSIZE;
529}
530
d67b8c61
ND		 531void inet6_netconf_notify_devconf(struct net *net, int type, int ifindex,
532 struct ipv6_devconf *devconf)
f3a1bfb1
ND		 533{
534 struct sk_buff *skb;
535 int err = -ENOBUFS;
536
537 skb = nlmsg_new(inet6_netconf_msgsize_devconf(type), GFP_ATOMIC);
63159f29 538 if (!skb)
f3a1bfb1
ND		 539 goto errout;
540
541 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 0, 0,
542 RTM_NEWNETCONF, 0, type);
543 if (err < 0) {
544 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
545 WARN_ON(err == -EMSGSIZE);
546 kfree_skb(skb);
547 goto errout;
548 }
549 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_NETCONF, NULL, GFP_ATOMIC);
550 return;
551errout:
bd779028 552 rtnl_set_sk_err(net, RTNLGRP_IPV6_NETCONF, err);
f3a1bfb1
ND		 553}
554
76f8f6cb
ND		 555static const struct nla_policy devconf_ipv6_policy[NETCONFA_MAX+1] = {
556 [NETCONFA_IFINDEX] = { .len = sizeof(int) },
557 [NETCONFA_FORWARDING] = { .len = sizeof(int) },
c92d5491 558 [NETCONFA_PROXY_NEIGH] = { .len = sizeof(int) },
35103d11 559 [NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN] = { .len = sizeof(int) },
76f8f6cb
ND		 560};
561
562static int inet6_netconf_get_devconf(struct sk_buff *in_skb,
661d2967 563 struct nlmsghdr *nlh)
76f8f6cb
ND		 564{
565 struct net *net = sock_net(in_skb->sk);
566 struct nlattr *tb[NETCONFA_MAX+1];
567 struct netconfmsg *ncm;
568 struct sk_buff *skb;
569 struct ipv6_devconf *devconf;
570 struct inet6_dev *in6_dev;
571 struct net_device *dev;
572 int ifindex;
573 int err;
574
575 err = nlmsg_parse(nlh, sizeof(*ncm), tb, NETCONFA_MAX,
576 devconf_ipv6_policy);
577 if (err < 0)
578 goto errout;
579
580 err = EINVAL;
581 if (!tb[NETCONFA_IFINDEX])
582 goto errout;
583
584 ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]);
585 switch (ifindex) {
586 case NETCONFA_IFINDEX_ALL:
587 devconf = net->ipv6.devconf_all;
588 break;
589 case NETCONFA_IFINDEX_DEFAULT:
590 devconf = net->ipv6.devconf_dflt;
591 break;
592 default:
593 dev = __dev_get_by_index(net, ifindex);
63159f29 594 if (!dev)
76f8f6cb
ND		 595 goto errout;
596 in6_dev = __in6_dev_get(dev);
63159f29 597 if (!in6_dev)
76f8f6cb
ND		 598 goto errout;
599 devconf = &in6_dev->cnf;
600 break;
601 }
602
603 err = -ENOBUFS;
604 skb = nlmsg_new(inet6_netconf_msgsize_devconf(-1), GFP_ATOMIC);
63159f29 605 if (!skb)
76f8f6cb
ND		 606 goto errout;
607
608 err = inet6_netconf_fill_devconf(skb, ifindex, devconf,
609 NETLINK_CB(in_skb).portid,
610 nlh->nlmsg_seq, RTM_NEWNETCONF, 0,
611 -1);
612 if (err < 0) {
613 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
614 WARN_ON(err == -EMSGSIZE);
615 kfree_skb(skb);
616 goto errout;
617 }
618 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
619errout:
620 return err;
621}
622
7a674200
ND		 623static int inet6_netconf_dump_devconf(struct sk_buff *skb,
624 struct netlink_callback *cb)
625{
626 struct net *net = sock_net(skb->sk);
627 int h, s_h;
628 int idx, s_idx;
629 struct net_device *dev;
630 struct inet6_dev *idev;
631 struct hlist_head *head;
632
633 s_h = cb->args[0];
634 s_idx = idx = cb->args[1];
635
636 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
637 idx = 0;
638 head = &net->dev_index_head[h];
639 rcu_read_lock();
63998ac2
ND		 640 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^
641 net->dev_base_seq;
7a674200
ND		 642 hlist_for_each_entry_rcu(dev, head, index_hlist) {
643 if (idx < s_idx)
644 goto cont;
645 idev = __in6_dev_get(dev);
646 if (!idev)
647 goto cont;
648
649 if (inet6_netconf_fill_devconf(skb, dev->ifindex,
650 &idev->cnf,
651 NETLINK_CB(cb->skb).portid,
652 cb->nlh->nlmsg_seq,
653 RTM_NEWNETCONF,
654 NLM_F_MULTI,
053c095a 655 -1) < 0) {
7a674200
ND		 656 rcu_read_unlock();
657 goto done;
658 }
63998ac2 659 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
7a674200
ND		 660cont:
661 idx++;
662 }
663 rcu_read_unlock();
664 }
665 if (h == NETDEV_HASHENTRIES) {
666 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL,
667 net->ipv6.devconf_all,
668 NETLINK_CB(cb->skb).portid,
669 cb->nlh->nlmsg_seq,
670 RTM_NEWNETCONF, NLM_F_MULTI,
053c095a 671 -1) < 0)
7a674200
ND		 672 goto done;
673 else
674 h++;
675 }
676 if (h == NETDEV_HASHENTRIES + 1) {
677 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT,
678 net->ipv6.devconf_dflt,
679 NETLINK_CB(cb->skb).portid,
680 cb->nlh->nlmsg_seq,
681 RTM_NEWNETCONF, NLM_F_MULTI,
053c095a 682 -1) < 0)
7a674200
ND		 683 goto done;
684 else
685 h++;
686 }
687done:
688 cb->args[0] = h;
689 cb->args[1] = idx;
690
691 return skb->len;
692}
693
1da177e4
LT		 694#ifdef CONFIG_SYSCTL
695static void dev_forward_change(struct inet6_dev *idev)
696{
697 struct net_device *dev;
698 struct inet6_ifaddr *ifa;
1da177e4
LT		 699
700 if (!idev)
701 return;
702 dev = idev->dev;
0187bdfb
BH		 703 if (idev->cnf.forwarding)
704 dev_disable_lro(dev);
1a940835 705 if (dev->flags & IFF_MULTICAST) {
2c5e8933 706 if (idev->cnf.forwarding) {
f3ee4010 707 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
2c5e8933
HFS		 708 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allrouters);
709 ipv6_dev_mc_inc(dev, &in6addr_sitelocal_allrouters);
710 } else {
f3ee4010 711 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
2c5e8933
HFS		 712 ipv6_dev_mc_dec(dev, &in6addr_interfacelocal_allrouters);
713 ipv6_dev_mc_dec(dev, &in6addr_sitelocal_allrouters);
714 }
1da177e4 715 }
502a2ffd 716
717 list_for_each_entry(ifa, &idev->addr_list, if_list) {
2c12a74c
MW		 718 if (ifa->flags&IFA_F_TENTATIVE)
719 continue;
1da177e4
LT		 720 if (idev->cnf.forwarding)
721 addrconf_join_anycast(ifa);
722 else
723 addrconf_leave_anycast(ifa);
724 }
f3a1bfb1
ND		 725 inet6_netconf_notify_devconf(dev_net(dev), NETCONFA_FORWARDING,
726 dev->ifindex, &idev->cnf);
1da177e4
LT		 727}
728
729
e186932b 730static void addrconf_forward_change(struct net *net, __s32 newf)
1da177e4
LT		 731{
732 struct net_device *dev;
733 struct inet6_dev *idev;
734
4acd4945 735 for_each_netdev(net, dev) {
1da177e4
LT		 736 idev = __in6_dev_get(dev);
737 if (idev) {
e186932b
PE		 738 int changed = (!idev->cnf.forwarding) ^ (!newf);
739 idev->cnf.forwarding = newf;
1da177e4
LT		 740 if (changed)
741 dev_forward_change(idev);
742 }
1da177e4 743 }
1da177e4 744}
c8fecf22 745
013d97e9 746static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf)
c8fecf22 747{
bff16c2f 748 struct net *net;
013d97e9
FR		 749 int old;
750
751 if (!rtnl_trylock())
752 return restart_syscall();
bff16c2f
PE		 753
754 net = (struct net *)table->extra2;
013d97e9
FR		 755 old = *p;
756 *p = newf;
b325fddb 757
013d97e9 758 if (p == &net->ipv6.devconf_dflt->forwarding) {
f3a1bfb1
ND		 759 if ((!newf) ^ (!old))
760 inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING,
761 NETCONFA_IFINDEX_DEFAULT,
762 net->ipv6.devconf_dflt);
013d97e9
FR		 763 rtnl_unlock();
764 return 0;
88af182e 765 }
c8fecf22 766
e186932b 767 if (p == &net->ipv6.devconf_all->forwarding) {
e186932b
PE		 768 net->ipv6.devconf_dflt->forwarding = newf;
769 addrconf_forward_change(net, newf);
f3a1bfb1
ND		 770 if ((!newf) ^ (!old))
771 inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING,
772 NETCONFA_IFINDEX_ALL,
773 net->ipv6.devconf_all);
013d97e9 774 } else if ((!newf) ^ (!old))
c8fecf22 775 dev_forward_change((struct inet6_dev *)table->extra1);
0187bdfb 776 rtnl_unlock();
c8fecf22 777
013d97e9 778 if (newf)
7b4da532 779 rt6_purge_dflt_routers(net);
b325fddb 780 return 1;
c8fecf22 781}
35103d11
AG		 782
783static void addrconf_linkdown_change(struct net *net, __s32 newf)
784{
785 struct net_device *dev;
786 struct inet6_dev *idev;
787
788 for_each_netdev(net, dev) {
789 idev = __in6_dev_get(dev);
790 if (idev) {
791 int changed = (!idev->cnf.ignore_routes_with_linkdown) ^ (!newf);
792
793 idev->cnf.ignore_routes_with_linkdown = newf;
794 if (changed)
795 inet6_netconf_notify_devconf(dev_net(dev),
796 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
797 dev->ifindex,
798 &idev->cnf);
799 }
800 }
801}
802
803static int addrconf_fixup_linkdown(struct ctl_table *table, int *p, int newf)
804{
805 struct net *net;
806 int old;
807
808 if (!rtnl_trylock())
809 return restart_syscall();
810
811 net = (struct net *)table->extra2;
812 old = *p;
813 *p = newf;
814
815 if (p == &net->ipv6.devconf_dflt->ignore_routes_with_linkdown) {
816 if ((!newf) ^ (!old))
817 inet6_netconf_notify_devconf(net,
818 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
819 NETCONFA_IFINDEX_DEFAULT,
820 net->ipv6.devconf_dflt);
821 rtnl_unlock();
822 return 0;
823 }
824
825 if (p == &net->ipv6.devconf_all->ignore_routes_with_linkdown) {
826 net->ipv6.devconf_dflt->ignore_routes_with_linkdown = newf;
827 addrconf_linkdown_change(net, newf);
828 if ((!newf) ^ (!old))
829 inet6_netconf_notify_devconf(net,
830 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
831 NETCONFA_IFINDEX_ALL,
832 net->ipv6.devconf_all);
833 }
834 rtnl_unlock();
835
836 return 1;
837}
838
1da177e4
LT		 839#endif
840
5c578aed 841/* Nobody refers to this ifaddr, destroy it */
1da177e4
LT		 842void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
843{
c2e21293 844 WARN_ON(!hlist_unhashed(&ifp->addr_lst));
547b792c 845
1da177e4 846#ifdef NET_REFCNT_DEBUG
91df42be 847 pr_debug("%s\n", __func__);
1da177e4
LT		 848#endif
849
850 in6_dev_put(ifp->idev);
851
c15b1cca
HFS		 852 if (cancel_delayed_work(&ifp->dad_work))
853 pr_notice("delayed DAD work was pending while freeing ifa=%p\n",
854 ifp);
1da177e4 855
e9d3e084 856 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
f3213831 857 pr_warn("Freeing alive inet6 address %p\n", ifp);
1da177e4
LT		 858 return;
859 }
94e187c0 860 ip6_rt_put(ifp->rt);
1da177e4 861
e5785985 862 kfree_rcu(ifp, rcu);
1da177e4
LT		 863}
864
e55ffac6
BH		 865static void
866ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
867{
502a2ffd 868 struct list_head *p;
8a6ce0c0 869 int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
e55ffac6
BH		 870
871 /*
872 * Each device address list is sorted in order of scope -
873 * global before linklocal.
874 */
502a2ffd 875 list_for_each(p, &idev->addr_list) {
876 struct inet6_ifaddr *ifa
877 = list_entry(p, struct inet6_ifaddr, if_list);
8a6ce0c0 878 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
e55ffac6
BH		 879 break;
880 }
881
b54c9b98 882 list_add_tail(&ifp->if_list, p);
e55ffac6
BH		 883}
884
ddbe5032 885static u32 inet6_addr_hash(const struct in6_addr *addr)
3eb84f49 886{
ddbe5032 887 return hash_32(ipv6_addr_hash(addr), IN6_ADDR_HSIZE_SHIFT);
3eb84f49
YH		 888}
889
1da177e4
LT		 890/* On success it returns ifp with increased reference count */
891
892static struct inet6_ifaddr *
3f8f5298
JP		 893ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
894 const struct in6_addr *peer_addr, int pfxlen,
8a226b2c 895 int scope, u32 flags, u32 valid_lft, u32 prefered_lft)
1da177e4
LT		 896{
897 struct inet6_ifaddr *ifa = NULL;
898 struct rt6_info *rt;
3a88a81d 899 unsigned int hash;
1da177e4 900 int err = 0;
d68b8270
YH		 901 int addr_type = ipv6_addr_type(addr);
902
903 if (addr_type == IPV6_ADDR_ANY ||
904 addr_type & IPV6_ADDR_MULTICAST ||
905 (!(idev->dev->flags & IFF_LOOPBACK) &&
906 addr_type & IPV6_ADDR_LOOPBACK))
907 return ERR_PTR(-EADDRNOTAVAIL);
1da177e4 908
8814c4b5 909 rcu_read_lock_bh();
1da177e4
LT		 910 if (idev->dead) {
911 err = -ENODEV; /*XXX*/
912 goto out2;
913 }
914
56d417b1 915 if (idev->cnf.disable_ipv6) {
9bdd8d40
BH		 916 err = -EACCES;
917 goto out2;
918 }
919
5c578aed 920 spin_lock(&addrconf_hash_lock);
1da177e4
LT		 921
922 /* Ignore adding duplicate addresses on an interface */
c346dca1 923 if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) {
ba3542e1 924 ADBG("ipv6_add_addr: already assigned\n");
1da177e4
LT		 925 err = -EEXIST;
926 goto out;
927 }
928
322f74a4 929 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
1da177e4 930
63159f29 931 if (!ifa) {
ba3542e1 932 ADBG("ipv6_add_addr: malloc failed\n");
1da177e4
LT		 933 err = -ENOBUFS;
934 goto out;
935 }
936
8f031519 937 rt = addrconf_dst_alloc(idev, addr, false);
1da177e4
LT		 938 if (IS_ERR(rt)) {
939 err = PTR_ERR(rt);
940 goto out;
941 }
942
bba24896
JP		 943 neigh_parms_data_state_setall(idev->nd_parms);
944
4e3fd7a0 945 ifa->addr = *addr;
3f8f5298
JP		 946 if (peer_addr)
947 ifa->peer_addr = *peer_addr;
1da177e4
LT		 948
949 spin_lock_init(&ifa->lock);
c15b1cca 950 INIT_DELAYED_WORK(&ifa->dad_work, addrconf_dad_work);
c2e21293 951 INIT_HLIST_NODE(&ifa->addr_lst);
1da177e4
LT		 952 ifa->scope = scope;
953 ifa->prefix_len = pfxlen;
954 ifa->flags = flags | IFA_F_TENTATIVE;
8a226b2c
JB		 955 ifa->valid_lft = valid_lft;
956 ifa->prefered_lft = prefered_lft;
1da177e4 957 ifa->cstamp = ifa->tstamp = jiffies;
617fe29d 958 ifa->tokenized = false;
1da177e4 959
57f5f544
KF		 960 ifa->rt = rt;
961
1da177e4
LT		 962 ifa->idev = idev;
963 in6_dev_hold(idev);
964 /* For caller */
965 in6_ifa_hold(ifa);
966
967 /* Add to big hash table */
ddbe5032 968 hash = inet6_addr_hash(addr);
1da177e4 969
5c578aed 970 hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]);
5c578aed 971 spin_unlock(&addrconf_hash_lock);
1da177e4
LT		 972
973 write_lock(&idev->lock);
974 /* Add to inet6_dev unicast addr list. */
e55ffac6 975 ipv6_link_dev_addr(idev, ifa);
1da177e4 976
1da177e4 977 if (ifa->flags&IFA_F_TEMPORARY) {
372e6c8f 978 list_add(&ifa->tmp_list, &idev->tempaddr_list);
1da177e4
LT		 979 in6_ifa_hold(ifa);
980 }
1da177e4 981
1da177e4
LT		 982 in6_ifa_hold(ifa);
983 write_unlock(&idev->lock);
984out2:
8814c4b5 985 rcu_read_unlock_bh();
1da177e4 986
fd92833a 987 if (likely(err == 0))
f88c91dd 988 inet6addr_notifier_call_chain(NETDEV_UP, ifa);
1da177e4
LT		 989 else {
990 kfree(ifa);
991 ifa = ERR_PTR(err);
992 }
993
994 return ifa;
995out:
5c578aed 996 spin_unlock(&addrconf_hash_lock);
1da177e4
LT		 997 goto out2;
998}
999
5b84efec
TH		 1000enum cleanup_prefix_rt_t {
1001 CLEANUP_PREFIX_RT_NOP, /* no cleanup action for prefix route */
1002 CLEANUP_PREFIX_RT_DEL, /* delete the prefix route */
1003 CLEANUP_PREFIX_RT_EXPIRE, /* update the lifetime of the prefix route */
1004};
1005
1006/*
1007 * Check, whether the prefix for ifp would still need a prefix route
1008 * after deleting ifp. The function returns one of the CLEANUP_PREFIX_RT_*
1009 * constants.
1010 *
1011 * 1) we don't purge prefix if address was not permanent.
1012 * prefix is managed by its own lifetime.
1013 * 2) we also don't purge, if the address was IFA_F_NOPREFIXROUTE.
1014 * 3) if there are no addresses, delete prefix.
1015 * 4) if there are still other permanent address(es),
1016 * corresponding prefix is still permanent.
1017 * 5) if there are still other addresses with IFA_F_NOPREFIXROUTE,
1018 * don't purge the prefix, assume user space is managing it.
1019 * 6) otherwise, update prefix lifetime to the
1020 * longest valid lifetime among the corresponding
1021 * addresses on the device.
1022 * Note: subsequent RA will update lifetime.
1023 **/
1024static enum cleanup_prefix_rt_t
1025check_cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long *expires)
1026{
1027 struct inet6_ifaddr *ifa;
1028 struct inet6_dev *idev = ifp->idev;
1029 unsigned long lifetime;
1030 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_DEL;
1031
1032 *expires = jiffies;
1033
1034 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1035 if (ifa == ifp)
1036 continue;
1037 if (!ipv6_prefix_equal(&ifa->addr, &ifp->addr,
1038 ifp->prefix_len))
1039 continue;
1040 if (ifa->flags & (IFA_F_PERMANENT | IFA_F_NOPREFIXROUTE))
1041 return CLEANUP_PREFIX_RT_NOP;
1042
1043 action = CLEANUP_PREFIX_RT_EXPIRE;
1044
1045 spin_lock(&ifa->lock);
1046
1047 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
1048 /*
1049 * Note: Because this address is
1050 * not permanent, lifetime <
1051 * LONG_MAX / HZ here.
1052 */
1053 if (time_before(*expires, ifa->tstamp + lifetime * HZ))
1054 *expires = ifa->tstamp + lifetime * HZ;
1055 spin_unlock(&ifa->lock);
1056 }
1057
1058 return action;
1059}
1060
1061static void
1062cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long expires, bool del_rt)
1063{
1064 struct rt6_info *rt;
1065
1066 rt = addrconf_get_prefix_route(&ifp->addr,
1067 ifp->prefix_len,
1068 ifp->idev->dev,
1069 0, RTF_GATEWAY | RTF_DEFAULT);
1070 if (rt) {
1071 if (del_rt)
1072 ip6_del_rt(rt);
1073 else {
1074 if (!(rt->rt6i_flags & RTF_EXPIRES))
1075 rt6_set_expires(rt, expires);
1076 ip6_rt_put(rt);
1077 }
1078 }
1079}
1080
1081
1da177e4
LT		 1082/* This function wants to get referenced ifp and releases it before return */
1083
1084static void ipv6_del_addr(struct inet6_ifaddr *ifp)
1085{
4c5ff6a6 1086 int state;
5b84efec
TH		 1087 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_NOP;
1088 unsigned long expires;
1da177e4 1089
c15b1cca
HFS		 1090 ASSERT_RTNL();
1091
8e8e676d 1092 spin_lock_bh(&ifp->lock);
4c5ff6a6 1093 state = ifp->state;
e9d3e084 1094 ifp->state = INET6_IFADDR_STATE_DEAD;
8e8e676d 1095 spin_unlock_bh(&ifp->lock);
4c5ff6a6
HX		 1096
1097 if (state == INET6_IFADDR_STATE_DEAD)
1098 goto out;
1da177e4 1099
5c578aed 1100 spin_lock_bh(&addrconf_hash_lock);
1101 hlist_del_init_rcu(&ifp->addr_lst);
5c578aed 1102 spin_unlock_bh(&addrconf_hash_lock);
1da177e4 1103
5b84efec 1104 write_lock_bh(&ifp->idev->lock);
5d9efa7e 1105
1da177e4 1106 if (ifp->flags&IFA_F_TEMPORARY) {
372e6c8f 1107 list_del(&ifp->tmp_list);
1108 if (ifp->ifpub) {
1109 in6_ifa_put(ifp->ifpub);
1110 ifp->ifpub = NULL;
1da177e4 1111 }
372e6c8f 1112 __in6_ifa_put(ifp);
1da177e4 1113 }
1da177e4 1114
5b84efec
TH		 1115 if (ifp->flags & IFA_F_PERMANENT && !(ifp->flags & IFA_F_NOPREFIXROUTE))
1116 action = check_cleanup_prefix_route(ifp, &expires);
502a2ffd 1117
5b84efec
TH		 1118 list_del_init(&ifp->if_list);
1119 __in6_ifa_put(ifp);
1120
1121 write_unlock_bh(&ifp->idev->lock);
1da177e4 1122
c15b1cca 1123 addrconf_del_dad_work(ifp);
b2238566 1124
1da177e4
LT		 1125 ipv6_ifa_notify(RTM_DELADDR, ifp);
1126
f88c91dd 1127 inet6addr_notifier_call_chain(NETDEV_DOWN, ifp);
1da177e4 1128
5b84efec
TH		 1129 if (action != CLEANUP_PREFIX_RT_NOP) {
1130 cleanup_prefix_route(ifp, expires,
1131 action == CLEANUP_PREFIX_RT_DEL);
1da177e4
LT		 1132 }
1133
c3968a85
DW		 1134 /* clean up prefsrc entries */
1135 rt6_remove_prefsrc(ifp);
4c5ff6a6 1136out:
1da177e4
LT		 1137 in6_ifa_put(ifp);
1138}
1139
1da177e4
LT		 1140static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
1141{
1142 struct inet6_dev *idev = ifp->idev;
1143 struct in6_addr addr, *tmpaddr;
76f793e3 1144 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_tstamp, age;
eac55bf9 1145 unsigned long regen_advance;
1da177e4
LT		 1146 int tmp_plen;
1147 int ret = 0;
95c385b4 1148 u32 addr_flags;
76f793e3 1149 unsigned long now = jiffies;
1da177e4 1150
53bd6749 1151 write_lock_bh(&idev->lock);
1da177e4
LT		 1152 if (ift) {
1153 spin_lock_bh(&ift->lock);
1154 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
1155 spin_unlock_bh(&ift->lock);
1156 tmpaddr = &addr;
1157 } else {
1158 tmpaddr = NULL;
1159 }
1160retry:
1161 in6_dev_hold(idev);
1162 if (idev->cnf.use_tempaddr <= 0) {
53bd6749 1163 write_unlock_bh(&idev->lock);
f3213831 1164 pr_info("%s: use_tempaddr is disabled\n", __func__);
1da177e4
LT		 1165 in6_dev_put(idev);
1166 ret = -1;
1167 goto out;
1168 }
1169 spin_lock_bh(&ifp->lock);
1170 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
1171 idev->cnf.use_tempaddr = -1; /*XXX*/
1172 spin_unlock_bh(&ifp->lock);
53bd6749 1173 write_unlock_bh(&idev->lock);
f3213831
JP		 1174 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n",
1175 __func__);
1da177e4
LT		 1176 in6_dev_put(idev);
1177 ret = -1;
1178 goto out;
1179 }
1180 in6_ifa_hold(ifp);
1181 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
eb7e0575 1182 __ipv6_try_regen_rndid(idev, tmpaddr);
1da177e4 1183 memcpy(&addr.s6_addr[8], idev->rndid, 8);
76f793e3 1184 age = (now - ifp->tstamp) / HZ;
1da177e4
LT		 1185 tmp_valid_lft = min_t(__u32,
1186 ifp->valid_lft,
7a876b0e 1187 idev->cnf.temp_valid_lft + age);
1ab1457c
YH		 1188 tmp_prefered_lft = min_t(__u32,
1189 ifp->prefered_lft,
7a876b0e 1190 idev->cnf.temp_prefered_lft + age -
784e2710 1191 idev->cnf.max_desync_factor);
1da177e4 1192 tmp_plen = ifp->prefix_len;
1da177e4
LT		 1193 tmp_tstamp = ifp->tstamp;
1194 spin_unlock_bh(&ifp->lock);
1195
eac55bf9 1196 regen_advance = idev->cnf.regen_max_retry *
67ba4152
IM		 1197 idev->cnf.dad_transmits *
1198 NEIGH_VAR(idev->nd_parms, RETRANS_TIME) / HZ;
53bd6749 1199 write_unlock_bh(&idev->lock);
95c385b4 1200
eac55bf9
BB		 1201 /* A temporary address is created only if this calculated Preferred
1202 * Lifetime is greater than REGEN_ADVANCE time units. In particular,
1203 * an implementation must not create a temporary address with a zero
1204 * Preferred Lifetime.
ecab6701
HK		 1205 * Use age calculation as in addrconf_verify to avoid unnecessary
1206 * temporary addresses being generated.
eac55bf9 1207 */
ecab6701
HK		 1208 age = (now - tmp_tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
1209 if (tmp_prefered_lft <= regen_advance + age) {
eac55bf9
BB		 1210 in6_ifa_put(ifp);
1211 in6_dev_put(idev);
1212 ret = -1;
1213 goto out;
1214 }
1215
95c385b4
NH		 1216 addr_flags = IFA_F_TEMPORARY;
1217 /* set in addrconf_prefix_rcv() */
1218 if (ifp->flags & IFA_F_OPTIMISTIC)
1219 addr_flags |= IFA_F_OPTIMISTIC;
1220
4b08a8f1
HFS		 1221 ift = ipv6_add_addr(idev, &addr, NULL, tmp_plen,
1222 ipv6_addr_scope(&addr), addr_flags,
1223 tmp_valid_lft, tmp_prefered_lft);
1224 if (IS_ERR(ift)) {
1da177e4
LT		 1225 in6_ifa_put(ifp);
1226 in6_dev_put(idev);
f3213831 1227 pr_info("%s: retry temporary address regeneration\n", __func__);
1da177e4 1228 tmpaddr = &addr;
53bd6749 1229 write_lock_bh(&idev->lock);
1da177e4
LT		 1230 goto retry;
1231 }
1232
1233 spin_lock_bh(&ift->lock);
1234 ift->ifpub = ifp;
76f793e3 1235 ift->cstamp = now;
1da177e4
LT		 1236 ift->tstamp = tmp_tstamp;
1237 spin_unlock_bh(&ift->lock);
1238
cf22f9a2 1239 addrconf_dad_start(ift);
1da177e4
LT		 1240 in6_ifa_put(ift);
1241 in6_dev_put(idev);
1242out:
1243 return ret;
1244}
1da177e4
LT		 1245
1246/*
072047e4 1247 * Choose an appropriate source address (RFC3484)
1da177e4 1248 */
a9b05723
YH		 1249enum {
1250 IPV6_SADDR_RULE_INIT = 0,
1251 IPV6_SADDR_RULE_LOCAL,
1252 IPV6_SADDR_RULE_SCOPE,
1253 IPV6_SADDR_RULE_PREFERRED,
1254#ifdef CONFIG_IPV6_MIP6
1255 IPV6_SADDR_RULE_HOA,
1256#endif
1257 IPV6_SADDR_RULE_OIF,
1258 IPV6_SADDR_RULE_LABEL,
a9b05723 1259 IPV6_SADDR_RULE_PRIVACY,
a9b05723
YH		 1260 IPV6_SADDR_RULE_ORCHID,
1261 IPV6_SADDR_RULE_PREFIX,
7fd2561e
EK		 1262#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1263 IPV6_SADDR_RULE_NOT_OPTIMISTIC,
1264#endif
a9b05723
YH		 1265 IPV6_SADDR_RULE_MAX
1266};
1267
072047e4 1268struct ipv6_saddr_score {
a9b05723
YH		 1269 int rule;
1270 int addr_type;
1271 struct inet6_ifaddr *ifa;
1272 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
1273 int scopedist;
1274 int matchlen;
072047e4
YH		 1275};
1276
a9b05723 1277struct ipv6_saddr_dst {
9acd9f3a 1278 const struct in6_addr *addr;
a9b05723
YH		 1279 int ifindex;
1280 int scope;
1281 int label;
7cbca67c 1282 unsigned int prefs;
a9b05723 1283};
072047e4 1284
b6f99a21 1285static inline int ipv6_saddr_preferred(int type)
1da177e4 1286{
45bb0060 1287 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
072047e4
YH		 1288 return 1;
1289 return 0;
1da177e4
LT		 1290}
1291
7fd2561e
EK		 1292static inline bool ipv6_use_optimistic_addr(struct inet6_dev *idev)
1293{
1294#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1295 return idev && idev->cnf.optimistic_dad && idev->cnf.use_optimistic;
1296#else
1297 return false;
1298#endif
1299}
1300
3de23255
BT		 1301static int ipv6_get_saddr_eval(struct net *net,
1302 struct ipv6_saddr_score *score,
a9b05723
YH		 1303 struct ipv6_saddr_dst *dst,
1304 int i)
1305{
1306 int ret;
1307
1308 if (i <= score->rule) {
1309 switch (i) {
1310 case IPV6_SADDR_RULE_SCOPE:
1311 ret = score->scopedist;
1312 break;
1313 case IPV6_SADDR_RULE_PREFIX:
1314 ret = score->matchlen;
1315 break;
1316 default:
1317 ret = !!test_bit(i, score->scorebits);
1318 }
1319 goto out;
1320 }
1321
1322 switch (i) {
1323 case IPV6_SADDR_RULE_INIT:
1324 /* Rule 0: remember if hiscore is not ready yet */
1325 ret = !!score->ifa;
1326 break;
1327 case IPV6_SADDR_RULE_LOCAL:
1328 /* Rule 1: Prefer same address */
1329 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1330 break;
1331 case IPV6_SADDR_RULE_SCOPE:
1332 /* Rule 2: Prefer appropriate scope
1333 *
1334 * ret
1335 * ^
1336 * -1 | d 15
1337 * ---+--+-+---> scope
1338 * |
1339 * | d is scope of the destination.
1340 * B-d | \
1341 * | \ <- smaller scope is better if
db9c7c39 1342 * B-15 | \ if scope is enough for destination.
a9b05723
YH		 1343 * | ret = B - scope (-1 <= scope >= d <= 15).
1344 * d-C-1 | /
1345 * |/ <- greater is better
1346 * -C / if scope is not enough for destination.
1347 * /| ret = scope - C (-1 <= d < scope <= 15).
1348 *
1349 * d - C - 1 < B -15 (for all -1 <= d <= 15).
1350 * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1351 * Assume B = 0 and we get C > 29.
1352 */
1353 ret = __ipv6_addr_src_scope(score->addr_type);
1354 if (ret >= dst->scope)
1355 ret = -ret;
1356 else
1357 ret -= 128; /* 30 is enough */
1358 score->scopedist = ret;
1359 break;
1360 case IPV6_SADDR_RULE_PREFERRED:
7fd2561e 1361 {
a9b05723 1362 /* Rule 3: Avoid deprecated and optimistic addresses */
7fd2561e
EK		 1363 u8 avoid = IFA_F_DEPRECATED;
1364
1365 if (!ipv6_use_optimistic_addr(score->ifa->idev))
1366 avoid |= IFA_F_OPTIMISTIC;
a9b05723 1367 ret = ipv6_saddr_preferred(score->addr_type) ||
7fd2561e 1368 !(score->ifa->flags & avoid);
a9b05723 1369 break;
7fd2561e 1370 }
a9b05723
YH		 1371#ifdef CONFIG_IPV6_MIP6
1372 case IPV6_SADDR_RULE_HOA:
7cbca67c 1373 {
a9b05723 1374 /* Rule 4: Prefer home address */
7cbca67c
YH		 1375 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1376 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
a9b05723 1377 break;
7cbca67c 1378 }
a9b05723
YH		 1379#endif
1380 case IPV6_SADDR_RULE_OIF:
1381 /* Rule 5: Prefer outgoing interface */
1382 ret = (!dst->ifindex ||
1383 dst->ifindex == score->ifa->idev->dev->ifindex);
1384 break;
1385 case IPV6_SADDR_RULE_LABEL:
1386 /* Rule 6: Prefer matching label */
3de23255
BT		 1387 ret = ipv6_addr_label(net,
1388 &score->ifa->addr, score->addr_type,
a9b05723
YH		 1389 score->ifa->idev->dev->ifindex) == dst->label;
1390 break;
a9b05723 1391 case IPV6_SADDR_RULE_PRIVACY:
7cbca67c 1392 {
a9b05723 1393 /* Rule 7: Prefer public address
25985edc 1394 * Note: prefer temporary address if use_tempaddr >= 2
a9b05723 1395 */
7cbca67c
YH		 1396 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1397 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1398 score->ifa->idev->cnf.use_tempaddr >= 2;
1399 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
a9b05723 1400 break;
7cbca67c 1401 }
a9b05723
YH		 1402 case IPV6_SADDR_RULE_ORCHID:
1403 /* Rule 8-: Prefer ORCHID vs ORCHID or
1404 * non-ORCHID vs non-ORCHID
1405 */
1406 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1407 ipv6_addr_orchid(dst->addr));
1408 break;
1409 case IPV6_SADDR_RULE_PREFIX:
1410 /* Rule 8: Use longest matching prefix */
91b4b04f
YH		 1411 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr);
1412 if (ret > score->ifa->prefix_len)
1413 ret = score->ifa->prefix_len;
1414 score->matchlen = ret;
a9b05723 1415 break;
7fd2561e
EK		 1416#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1417 case IPV6_SADDR_RULE_NOT_OPTIMISTIC:
1418 /* Optimistic addresses still have lower precedence than other
1419 * preferred addresses.
1420 */
1421 ret = !(score->ifa->flags & IFA_F_OPTIMISTIC);
1422 break;
1423#endif
a9b05723
YH		 1424 default:
1425 ret = 0;
1426 }
1427
1428 if (ret)
1429 __set_bit(i, score->scorebits);
1430 score->rule = i;
1431out:
1432 return ret;
1433}
1434
c0b8da1e
YH		 1435static int __ipv6_dev_get_saddr(struct net *net,
1436 struct ipv6_saddr_dst *dst,
c0b8da1e
YH		 1437 struct inet6_dev *idev,
1438 struct ipv6_saddr_score *scores,
1439 int hiscore_idx)
9131f3de 1440{
c0b8da1e 1441 struct ipv6_saddr_score *score = &scores[1 - hiscore_idx], *hiscore = &scores[hiscore_idx];
9131f3de
YH		 1442
1443 read_lock_bh(&idev->lock);
1444 list_for_each_entry(score->ifa, &idev->addr_list, if_list) {
1445 int i;
1446
1447 /*
1448 * - Tentative Address (RFC2462 section 5.4)
1449 * - A tentative address is not considered
1450 * "assigned to an interface" in the traditional
1451 * sense, unless it is also flagged as optimistic.
1452 * - Candidate Source Address (section 4)
1453 * - In any case, anycast addresses, multicast
1454 * addresses, and the unspecified address MUST
1455 * NOT be included in a candidate set.
1456 */
1457 if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1458 (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
1459 continue;
1460
1461 score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1462
1463 if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1464 score->addr_type & IPV6_ADDR_MULTICAST)) {
1465 net_dbg_ratelimited("ADDRCONF: unspecified / multicast address assigned as unicast address on %s",
1466 idev->dev->name);
1467 continue;
1468 }
1469
1470 score->rule = -1;
1471 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1472
1473 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1474 int minihiscore, miniscore;
1475
1476 minihiscore = ipv6_get_saddr_eval(net, hiscore, dst, i);
1477 miniscore = ipv6_get_saddr_eval(net, score, dst, i);
1478
1479 if (minihiscore > miniscore) {
1480 if (i == IPV6_SADDR_RULE_SCOPE &&
1481 score->scopedist > 0) {
1482 /*
1483 * special case:
1484 * each remaining entry
1485 * has too small (not enough)
1486 * scope, because ifa entries
1487 * are sorted by their scope
1488 * values.
1489 */
1490 goto out;
1491 }
1492 break;
1493 } else if (minihiscore < miniscore) {
1494 if (hiscore->ifa)
1495 in6_ifa_put(hiscore->ifa);
1496
1497 in6_ifa_hold(score->ifa);
1498
1499 swap(hiscore, score);
c0b8da1e 1500 hiscore_idx = 1 - hiscore_idx;
9131f3de
YH		 1501
1502 /* restore our iterator */
1503 score->ifa = hiscore->ifa;
1504
1505 break;
1506 }
1507 }
1508 }
1509out:
1510 read_unlock_bh(&idev->lock);
c0b8da1e 1511 return hiscore_idx;
9131f3de
YH		 1512}
1513
b3f644fc 1514int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev,
9acd9f3a 1515 const struct in6_addr *daddr, unsigned int prefs,
7cbca67c 1516 struct in6_addr *saddr)
1da177e4 1517{
c0b8da1e 1518 struct ipv6_saddr_score scores[2], *hiscore;
a9b05723 1519 struct ipv6_saddr_dst dst;
9131f3de 1520 struct inet6_dev *idev;
072047e4 1521 struct net_device *dev;
a9b05723 1522 int dst_type;
9131f3de 1523 bool use_oif_addr = false;
c0b8da1e 1524 int hiscore_idx = 0;
1da177e4 1525
a9b05723
YH		 1526 dst_type = __ipv6_addr_type(daddr);
1527 dst.addr = daddr;
1528 dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1529 dst.scope = __ipv6_addr_src_scope(dst_type);
3de23255 1530 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
7cbca67c 1531 dst.prefs = prefs;
a9b05723 1532
c0b8da1e
YH		 1533 scores[hiscore_idx].rule = -1;
1534 scores[hiscore_idx].ifa = NULL;
1da177e4 1535
8814c4b5 1536 rcu_read_lock();
1da177e4 1537
9131f3de
YH		 1538 /* Candidate Source Address (section 4)
1539 * - multicast and link-local destination address,
1540 * the set of candidate source address MUST only
1541 * include addresses assigned to interfaces
1542 * belonging to the same link as the outgoing
1543 * interface.
1544 * (- For site-local destination addresses, the
1545 * set of candidate source addresses MUST only
1546 * include addresses assigned to interfaces
1547 * belonging to the same site as the outgoing
1548 * interface.)
3985e8a3
EK		 1549 * - "It is RECOMMENDED that the candidate source addresses
1550 * be the set of unicast addresses assigned to the
1551 * interface that will be used to send to the destination
1552 * (the 'outgoing' interface)." (RFC 6724)
9131f3de
YH		 1553 */
1554 if (dst_dev) {
3985e8a3 1555 idev = __in6_dev_get(dst_dev);
9131f3de 1556 if ((dst_type & IPV6_ADDR_MULTICAST) ||
3985e8a3
EK		 1557 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL ||
1558 (idev && idev->cnf.use_oif_addrs_only)) {
9131f3de
YH		 1559 use_oif_addr = true;
1560 }
1561 }
a9b05723 1562
9131f3de 1563 if (use_oif_addr) {
c0b8da1e 1564 if (idev)
c15df306 1565 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx);
9131f3de
YH		 1566 } else {
1567 for_each_netdev_rcu(net, dev) {
1568 idev = __in6_dev_get(dev);
1569 if (!idev)
072047e4 1570 continue;
c15df306 1571 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx);
1da177e4
LT		 1572 }
1573 }
8814c4b5 1574 rcu_read_unlock();
1da177e4 1575
c0b8da1e 1576 hiscore = &scores[hiscore_idx];
a9b05723 1577 if (!hiscore->ifa)
072047e4 1578 return -EADDRNOTAVAIL;
1ab1457c 1579
4e3fd7a0 1580 *saddr = hiscore->ifa->addr;
a9b05723 1581 in6_ifa_put(hiscore->ifa);
072047e4 1582 return 0;
1da177e4 1583}
5e5f3f0f 1584EXPORT_SYMBOL(ipv6_dev_get_saddr);
1da177e4 1585
8965779d 1586int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr,
479840ff 1587 u32 banned_flags)
b7b1bfce
HFS		 1588{
1589 struct inet6_ifaddr *ifp;
1590 int err = -EADDRNOTAVAIL;
1591
602582ca
HFS		 1592 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
1593 if (ifp->scope > IFA_LINK)
1594 break;
b7b1bfce
HFS		 1595 if (ifp->scope == IFA_LINK &&
1596 !(ifp->flags & banned_flags)) {
1597 *addr = ifp->addr;
1598 err = 0;
1599 break;
1600 }
1601 }
1602 return err;
1603}
1604
95c385b4 1605int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
479840ff 1606 u32 banned_flags)
1da177e4
LT		 1607{
1608 struct inet6_dev *idev;
1609 int err = -EADDRNOTAVAIL;
1610
8814c4b5 1611 rcu_read_lock();
e21e8467
SH		 1612 idev = __in6_dev_get(dev);
1613 if (idev) {
1da177e4 1614 read_lock_bh(&idev->lock);
b7b1bfce 1615 err = __ipv6_get_lladdr(idev, addr, banned_flags);
1da177e4
LT		 1616 read_unlock_bh(&idev->lock);
1617 }
8814c4b5 1618 rcu_read_unlock();
1da177e4
LT		 1619 return err;
1620}
1621
1622static int ipv6_count_addresses(struct inet6_dev *idev)
1623{
1624 int cnt = 0;
1625 struct inet6_ifaddr *ifp;
1626
1627 read_lock_bh(&idev->lock);
502a2ffd 1628 list_for_each_entry(ifp, &idev->addr_list, if_list)
1da177e4
LT		 1629 cnt++;
1630 read_unlock_bh(&idev->lock);
1631 return cnt;
1632}
1633
b71d1d42 1634int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
2a7851bf 1635 const struct net_device *dev, int strict)
c58da4c6
EK		 1636{
1637 return ipv6_chk_addr_and_flags(net, addr, dev, strict, IFA_F_TENTATIVE);
1638}
1639EXPORT_SYMBOL(ipv6_chk_addr);
1640
1641int ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr,
1642 const struct net_device *dev, int strict,
1643 u32 banned_flags)
1da177e4 1644{
eedf042a 1645 struct inet6_ifaddr *ifp;
ddbe5032 1646 unsigned int hash = inet6_addr_hash(addr);
c58da4c6 1647 u32 ifp_flags;
1da177e4 1648
5c578aed 1649 rcu_read_lock_bh();
b67bfe0d 1650 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
878628fb 1651 if (!net_eq(dev_net(ifp->idev->dev), net))
bfeade08 1652 continue;
c58da4c6
EK		 1653 /* Decouple optimistic from tentative for evaluation here.
1654 * Ban optimistic addresses explicitly, when required.
1655 */
1656 ifp_flags = (ifp->flags&IFA_F_OPTIMISTIC)
1657 ? (ifp->flags&~IFA_F_TENTATIVE)
1658 : ifp->flags;
1da177e4 1659 if (ipv6_addr_equal(&ifp->addr, addr) &&
c58da4c6 1660 !(ifp_flags&banned_flags) &&
63159f29 1661 (!dev || ifp->idev->dev == dev ||
eedf042a
SH		 1662 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) {
1663 rcu_read_unlock_bh();
1664 return 1;
1da177e4
LT		 1665 }
1666 }
5c578aed 1667
eedf042a
SH		 1668 rcu_read_unlock_bh();
1669 return 0;
1da177e4 1670}
c58da4c6 1671EXPORT_SYMBOL(ipv6_chk_addr_and_flags);
7159039a 1672
3e81c6da
DM		 1673static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1674 struct net_device *dev)
1da177e4 1675{
ddbe5032 1676 unsigned int hash = inet6_addr_hash(addr);
c2e21293 1677 struct inet6_ifaddr *ifp;
1da177e4 1678
b67bfe0d 1679 hlist_for_each_entry(ifp, &inet6_addr_lst[hash], addr_lst) {
878628fb 1680 if (!net_eq(dev_net(ifp->idev->dev), net))
06bfe655 1681 continue;
1da177e4 1682 if (ipv6_addr_equal(&ifp->addr, addr)) {
63159f29 1683 if (!dev || ifp->idev->dev == dev)
3e81c6da 1684 return true;
1da177e4
LT		 1685 }
1686 }
3e81c6da 1687 return false;
1da177e4
LT		 1688}
1689
7df37ff3
CB		 1690/* Compares an address/prefix_len with addresses on device @dev.
1691 * If one is found it returns true.
1692 */
1693bool ipv6_chk_custom_prefix(const struct in6_addr *addr,
1694 const unsigned int prefix_len, struct net_device *dev)
1695{
1696 struct inet6_dev *idev;
1697 struct inet6_ifaddr *ifa;
1698 bool ret = false;
1699
1700 rcu_read_lock();
1701 idev = __in6_dev_get(dev);
1702 if (idev) {
1703 read_lock_bh(&idev->lock);
1704 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1705 ret = ipv6_prefix_equal(addr, &ifa->addr, prefix_len);
1706 if (ret)
1707 break;
1708 }
1709 read_unlock_bh(&idev->lock);
1710 }
1711 rcu_read_unlock();
1712
1713 return ret;
1714}
1715EXPORT_SYMBOL(ipv6_chk_custom_prefix);
1716
b71d1d42 1717int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev)
52eeeb84
YH		 1718{
1719 struct inet6_dev *idev;
1720 struct inet6_ifaddr *ifa;
1721 int onlink;
1722
1723 onlink = 0;
1724 rcu_read_lock();
1725 idev = __in6_dev_get(dev);
1726 if (idev) {
1727 read_lock_bh(&idev->lock);
502a2ffd 1728 list_for_each_entry(ifa, &idev->addr_list, if_list) {
52eeeb84
YH		 1729 onlink = ipv6_prefix_equal(addr, &ifa->addr,
1730 ifa->prefix_len);
1731 if (onlink)
1732 break;
1733 }
1734 read_unlock_bh(&idev->lock);
1735 }
1736 rcu_read_unlock();
1737 return onlink;
1738}
52eeeb84
YH		 1739EXPORT_SYMBOL(ipv6_chk_prefix);
1740
9acd9f3a 1741struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1cab3da6 1742 struct net_device *dev, int strict)
1da177e4 1743{
b79d1d54 1744 struct inet6_ifaddr *ifp, *result = NULL;
ddbe5032 1745 unsigned int hash = inet6_addr_hash(addr);
1da177e4 1746
5c578aed 1747 rcu_read_lock_bh();
b67bfe0d 1748 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
878628fb 1749 if (!net_eq(dev_net(ifp->idev->dev), net))
1cab3da6 1750 continue;
1da177e4 1751 if (ipv6_addr_equal(&ifp->addr, addr)) {
63159f29 1752 if (!dev || ifp->idev->dev == dev ||
1da177e4 1753 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
b79d1d54 1754 result = ifp;
1da177e4
LT		 1755 in6_ifa_hold(ifp);
1756 break;
1757 }
1758 }
1759 }
5c578aed 1760 rcu_read_unlock_bh();
1da177e4 1761
b79d1d54 1762 return result;
1da177e4
LT		 1763}
1764
1da177e4
LT		 1765/* Gets referenced address, destroys ifaddr */
1766
cc411d0b 1767static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
1da177e4 1768{
1da177e4
LT		 1769 if (ifp->flags&IFA_F_PERMANENT) {
1770 spin_lock_bh(&ifp->lock);
c15b1cca 1771 addrconf_del_dad_work(ifp);
1da177e4 1772 ifp->flags |= IFA_F_TENTATIVE;
cc411d0b
BH		 1773 if (dad_failed)
1774 ifp->flags |= IFA_F_DADFAILED;
1da177e4 1775 spin_unlock_bh(&ifp->lock);
e2577a06
HX		 1776 if (dad_failed)
1777 ipv6_ifa_notify(0, ifp);
1da177e4 1778 in6_ifa_put(ifp);
1da177e4
LT		 1779 } else if (ifp->flags&IFA_F_TEMPORARY) {
1780 struct inet6_ifaddr *ifpub;
1781 spin_lock_bh(&ifp->lock);
1782 ifpub = ifp->ifpub;
1783 if (ifpub) {
1784 in6_ifa_hold(ifpub);
1785 spin_unlock_bh(&ifp->lock);
1786 ipv6_create_tempaddr(ifpub, ifp);
1787 in6_ifa_put(ifpub);
1788 } else {
1789 spin_unlock_bh(&ifp->lock);
1790 }
1791 ipv6_del_addr(ifp);
c15b1cca 1792 } else {
1da177e4 1793 ipv6_del_addr(ifp);
c15b1cca 1794 }
1da177e4
LT		 1795}
1796
f2344a13
HX		 1797static int addrconf_dad_end(struct inet6_ifaddr *ifp)
1798{
1799 int err = -ENOENT;
1800
8e8e676d 1801 spin_lock_bh(&ifp->lock);
f2344a13
HX		 1802 if (ifp->state == INET6_IFADDR_STATE_DAD) {
1803 ifp->state = INET6_IFADDR_STATE_POSTDAD;
1804 err = 0;
1805 }
8e8e676d 1806 spin_unlock_bh(&ifp->lock);
f2344a13
HX		 1807
1808 return err;
1809}
1810
3c21edbd
YH		 1811void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1812{
5f40ef77 1813 struct in6_addr addr;
1b34be74 1814 struct inet6_dev *idev = ifp->idev;
1855b7c3 1815 struct net *net = dev_net(ifp->idev->dev);
9bdd8d40 1816
853dc2e0
UB		 1817 if (addrconf_dad_end(ifp)) {
1818 in6_ifa_put(ifp);
f2344a13 1819 return;
853dc2e0 1820 }
f2344a13 1821
e87cc472
JP		 1822 net_info_ratelimited("%s: IPv6 duplicate address %pI6c detected!\n",
1823 ifp->idev->dev->name, &ifp->addr);
9bdd8d40 1824
5f40ef77
HFS		 1825 spin_lock_bh(&ifp->lock);
1826
1827 if (ifp->flags & IFA_F_STABLE_PRIVACY) {
1828 int scope = ifp->scope;
1829 u32 flags = ifp->flags;
1830 struct in6_addr new_addr;
1831 struct inet6_ifaddr *ifp2;
1832 u32 valid_lft, preferred_lft;
1833 int pfxlen = ifp->prefix_len;
5f40ef77
HFS		 1834 int retries = ifp->stable_privacy_retry + 1;
1835
1855b7c3 1836 if (retries > net->ipv6.sysctl.idgen_retries) {
5f40ef77
HFS		 1837 net_info_ratelimited("%s: privacy stable address generation failed because of DAD conflicts!\n",
1838 ifp->idev->dev->name);
1839 goto errdad;
1840 }
1841
1842 new_addr = ifp->addr;
1843 if (ipv6_generate_stable_address(&new_addr, retries,
1844 idev))
1845 goto errdad;
1846
1847 valid_lft = ifp->valid_lft;
1848 preferred_lft = ifp->prefered_lft;
1849
1850 spin_unlock_bh(&ifp->lock);
1b34be74 1851
5f40ef77
HFS		 1852 if (idev->cnf.max_addresses &&
1853 ipv6_count_addresses(idev) >=
1854 idev->cnf.max_addresses)
1855 goto lock_errdad;
1856
1857 net_info_ratelimited("%s: generating new stable privacy address because of DAD conflict\n",
1858 ifp->idev->dev->name);
1859
1860 ifp2 = ipv6_add_addr(idev, &new_addr, NULL, pfxlen,
1861 scope, flags, valid_lft,
1862 preferred_lft);
1863 if (IS_ERR(ifp2))
1864 goto lock_errdad;
1865
1866 spin_lock_bh(&ifp2->lock);
1867 ifp2->stable_privacy_retry = retries;
1868 ifp2->state = INET6_IFADDR_STATE_PREDAD;
1869 spin_unlock_bh(&ifp2->lock);
1870
1855b7c3 1871 addrconf_mod_dad_work(ifp2, net->ipv6.sysctl.idgen_delay);
5f40ef77
HFS		 1872 in6_ifa_put(ifp2);
1873lock_errdad:
1874 spin_lock_bh(&ifp->lock);
1875 } else if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6) {
1b34be74
YH		 1876 addr.s6_addr32[0] = htonl(0xfe800000);
1877 addr.s6_addr32[1] = 0;
1878
1879 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
1880 ipv6_addr_equal(&ifp->addr, &addr)) {
1881 /* DAD failed for link-local based on MAC address */
1882 idev->cnf.disable_ipv6 = 1;
9bdd8d40 1883
f3213831 1884 pr_info("%s: IPv6 being disabled!\n",
9bdd8d40 1885 ifp->idev->dev->name);
1b34be74
YH		 1886 }
1887 }
1888
5f40ef77 1889errdad:
c15b1cca
HFS		 1890 /* transition from _POSTDAD to _ERRDAD */
1891 ifp->state = INET6_IFADDR_STATE_ERRDAD;
8e8e676d 1892 spin_unlock_bh(&ifp->lock);
c15b1cca
HFS		 1893
1894 addrconf_mod_dad_work(ifp, 0);
3c21edbd 1895}
1da177e4 1896
a9ed4a29
SD		 1897/* Join to solicited addr multicast group.
1898 * caller must hold RTNL */
b71d1d42 1899void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr)
1da177e4
LT		 1900{
1901 struct in6_addr maddr;
1902
1903 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1904 return;
1905
1906 addrconf_addr_solict_mult(addr, &maddr);
1907 ipv6_dev_mc_inc(dev, &maddr);
1908}
1909
a9ed4a29 1910/* caller must hold RTNL */
b71d1d42 1911void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr)
1da177e4
LT		 1912{
1913 struct in6_addr maddr;
1914
1915 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1916 return;
1917
1918 addrconf_addr_solict_mult(addr, &maddr);
1919 __ipv6_dev_mc_dec(idev, &maddr);
1920}
1921
a9ed4a29 1922/* caller must hold RTNL */
20380731 1923static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1da177e4
LT		 1924{
1925 struct in6_addr addr;
c15b1cca 1926
88ad3149 1927 if (ifp->prefix_len >= 127) /* RFC 6164 */
2bda8a0c 1928 return;
1da177e4
LT		 1929 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1930 if (ipv6_addr_any(&addr))
1931 return;
013b4d90 1932 __ipv6_dev_ac_inc(ifp->idev, &addr);
1da177e4
LT		 1933}
1934
a9ed4a29 1935/* caller must hold RTNL */
20380731 1936static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1da177e4
LT		 1937{
1938 struct in6_addr addr;
c15b1cca 1939
88ad3149 1940 if (ifp->prefix_len >= 127) /* RFC 6164 */
32019e65 1941 return;
1da177e4
LT		 1942 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1943 if (ipv6_addr_any(&addr))
1944 return;
1945 __ipv6_dev_ac_dec(ifp->idev, &addr);
1946}
1947
06a4c1c5 1948static int addrconf_ifid_eui64(u8 *eui, struct net_device *dev)
1949{
1950 if (dev->addr_len != IEEE802154_ADDR_LEN)
1951 return -1;
1952 memcpy(eui, dev->dev_addr, 8);
5e98a36e 1953 eui[0] ^= 2;
06a4c1c5 1954 return 0;
1955}
1956
cb6bf355
YH		 1957static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev)
1958{
1959 union fwnet_hwaddr *ha;
1960
1961 if (dev->addr_len != FWNET_ALEN)
1962 return -1;
1963
1964 ha = (union fwnet_hwaddr *)dev->dev_addr;
1965
1966 memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id));
1967 eui[0] ^= 2;
1968 return 0;
1969}
1970
073a8e0e
YH		 1971static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1972{
1973 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1974 if (dev->addr_len != ARCNET_ALEN)
1975 return -1;
1976 memset(eui, 0, 7);
8e5e8f30 1977 eui[7] = *(u8 *)dev->dev_addr;
073a8e0e
YH		 1978 return 0;
1979}
1980
1981static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1982{
1983 if (dev->addr_len != INFINIBAND_ALEN)
1984 return -1;
1985 memcpy(eui, dev->dev_addr + 12, 8);
1986 eui[0] |= 2;
1987 return 0;
1988}
1989
c61393ea 1990static int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
dfd982ba 1991{
9af28511
SH		 1992 if (addr == 0)
1993 return -1;
dfd982ba
YH		 1994 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
1995 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
1996 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
1997 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
1998 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
1999 ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
2000 eui[1] = 0;
2001 eui[2] = 0x5E;
2002 eui[3] = 0xFE;
2003 memcpy(eui + 4, &addr, 4);
2004 return 0;
2005}
dfd982ba
YH		 2006
2007static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
2008{
2009 if (dev->priv_flags & IFF_ISATAP)
2010 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
2011 return -1;
2012}
2013
aee80b54 2014static int addrconf_ifid_gre(u8 *eui, struct net_device *dev)
2015{
2016 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
2017}
2018
e837735e
ND		 2019static int addrconf_ifid_ip6tnl(u8 *eui, struct net_device *dev)
2020{
2021 memcpy(eui, dev->perm_addr, 3);
2022 memcpy(eui + 5, dev->perm_addr + 3, 3);
2023 eui[3] = 0xFF;
2024 eui[4] = 0xFE;
2025 eui[0] ^= 2;
2026 return 0;
2027}
2028
1da177e4
LT		 2029static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
2030{
2031 switch (dev->type) {
2032 case ARPHRD_ETHER:
2033 case ARPHRD_FDDI:
073a8e0e 2034 return addrconf_ifid_eui48(eui, dev);
1da177e4 2035 case ARPHRD_ARCNET:
073a8e0e 2036 return addrconf_ifid_arcnet(eui, dev);
1da177e4 2037 case ARPHRD_INFINIBAND:
073a8e0e 2038 return addrconf_ifid_infiniband(eui, dev);
c7dc89c0 2039 case ARPHRD_SIT:
dfd982ba 2040 return addrconf_ifid_sit(eui, dev);
aee80b54 2041 case ARPHRD_IPGRE:
2042 return addrconf_ifid_gre(eui, dev);
e74bccb8 2043 case ARPHRD_6LOWPAN:
06a4c1c5 2044 case ARPHRD_IEEE802154:
2045 return addrconf_ifid_eui64(eui, dev);
cb6bf355
YH		 2046 case ARPHRD_IEEE1394:
2047 return addrconf_ifid_ieee1394(eui, dev);
e837735e
ND		 2048 case ARPHRD_TUNNEL6:
2049 return addrconf_ifid_ip6tnl(eui, dev);
1da177e4
LT		 2050 }
2051 return -1;
2052}
2053
2054static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
2055{
2056 int err = -1;
2057 struct inet6_ifaddr *ifp;
2058
2059 read_lock_bh(&idev->lock);
602582ca
HFS		 2060 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
2061 if (ifp->scope > IFA_LINK)
2062 break;
1da177e4
LT		 2063 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
2064 memcpy(eui, ifp->addr.s6_addr+8, 8);
2065 err = 0;
2066 break;
2067 }
2068 }
2069 read_unlock_bh(&idev->lock);
2070 return err;
2071}
2072
1da177e4 2073/* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
eb7e0575 2074static void __ipv6_regen_rndid(struct inet6_dev *idev)
1da177e4 2075{
1da177e4 2076regen:
955189ef 2077 get_random_bytes(idev->rndid, sizeof(idev->rndid));
1da177e4 2078 idev->rndid[0] &= ~0x02;
1da177e4
LT		 2079
2080 /*
2081 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
2082 * check if generated address is not inappropriate
2083 *
2084 * - Reserved subnet anycast (RFC 2526)
2085 * 11111101 11....11 1xxxxxxx
c7dc89c0 2086 * - ISATAP (RFC4214) 6.1
1da177e4
LT		 2087 * 00-00-5E-FE-xx-xx-xx-xx
2088 * - value 0
2089 * - XXX: already assigned to an address on the device
2090 */
1ab1457c 2091 if (idev->rndid[0] == 0xfd &&
1da177e4
LT		 2092 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
2093 (idev->rndid[7]&0x80))
2094 goto regen;
2095 if ((idev->rndid[0]|idev->rndid[1]) == 0) {
2096 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
2097 goto regen;
2098 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
2099 goto regen;
2100 }
1da177e4
LT		 2101}
2102
2103static void ipv6_regen_rndid(unsigned long data)
2104{
2105 struct inet6_dev *idev = (struct inet6_dev *) data;
2106 unsigned long expires;
2107
8814c4b5 2108 rcu_read_lock_bh();
1da177e4
LT		 2109 write_lock_bh(&idev->lock);
2110
2111 if (idev->dead)
2112 goto out;
2113
eb7e0575 2114 __ipv6_regen_rndid(idev);
1ab1457c 2115
1da177e4 2116 expires = jiffies +
1ab1457c 2117 idev->cnf.temp_prefered_lft * HZ -
1f9248e5
JP		 2118 idev->cnf.regen_max_retry * idev->cnf.dad_transmits *
2119 NEIGH_VAR(idev->nd_parms, RETRANS_TIME) -
784e2710 2120 idev->cnf.max_desync_factor * HZ;
1da177e4 2121 if (time_before(expires, jiffies)) {
f3213831
JP		 2122 pr_warn("%s: too short regeneration interval; timer disabled for %s\n",
2123 __func__, idev->dev->name);
1da177e4
LT		 2124 goto out;
2125 }
2126
2127 if (!mod_timer(&idev->regen_timer, expires))
2128 in6_dev_hold(idev);
2129
2130out:
2131 write_unlock_bh(&idev->lock);
8814c4b5 2132 rcu_read_unlock_bh();
1da177e4
LT		 2133 in6_dev_put(idev);
2134}
2135
eb7e0575 2136static void __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr)
8e5e8f30 2137{
1da177e4 2138 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
eb7e0575 2139 __ipv6_regen_rndid(idev);
1da177e4 2140}
1da177e4
LT		 2141
2142/*
2143 * Add prefix route.
2144 */
2145
2146static void
2147addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
e431b8c0 2148 unsigned long expires, u32 flags)
1da177e4 2149{
86872cb5 2150 struct fib6_config cfg = {
ca254490 2151 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX,
86872cb5
TG		 2152 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2153 .fc_ifindex = dev->ifindex,
2154 .fc_expires = expires,
2155 .fc_dst_len = plen,
2156 .fc_flags = RTF_UP | flags,
c346dca1 2157 .fc_nlinfo.nl_net = dev_net(dev),
f410a1fb 2158 .fc_protocol = RTPROT_KERNEL,
86872cb5 2159 };
1da177e4 2160
4e3fd7a0 2161 cfg.fc_dst = *pfx;
1da177e4
LT		 2162
2163 /* Prevent useless cloning on PtP SIT.
2164 This thing is done here expecting that the whole
2165 class of non-broadcast devices need not cloning.
2166 */
07a93626 2167#if IS_ENABLED(CONFIG_IPV6_SIT)
86872cb5
TG		 2168 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
2169 cfg.fc_flags |= RTF_NONEXTHOP;
0be669bb 2170#endif
1da177e4 2171
86872cb5 2172 ip6_route_add(&cfg);
1da177e4
LT		 2173}
2174
14ef37b6
AH		 2175
2176static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
2177 int plen,
2178 const struct net_device *dev,
2179 u32 flags, u32 noflags)
2180{
2181 struct fib6_node *fn;
2182 struct rt6_info *rt = NULL;
2183 struct fib6_table *table;
ca254490 2184 u32 tb_id = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX;
14ef37b6 2185
ca254490 2186 table = fib6_get_table(dev_net(dev), tb_id);
63159f29 2187 if (!table)
14ef37b6
AH		 2188 return NULL;
2189
5744dd9b 2190 read_lock_bh(&table->tb6_lock);
14ef37b6
AH		 2191 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0);
2192 if (!fn)
2193 goto out;
1f56a01f
MKL		 2194
2195 noflags |= RTF_CACHE;
14ef37b6 2196 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
d1918542 2197 if (rt->dst.dev->ifindex != dev->ifindex)
14ef37b6
AH		 2198 continue;
2199 if ((rt->rt6i_flags & flags) != flags)
2200 continue;
85da53bf 2201 if ((rt->rt6i_flags & noflags) != 0)
14ef37b6
AH		 2202 continue;
2203 dst_hold(&rt->dst);
2204 break;
2205 }
2206out:
5744dd9b 2207 read_unlock_bh(&table->tb6_lock);
14ef37b6
AH		 2208 return rt;
2209}
2210
2211
1da177e4
LT		 2212/* Create "default" multicast route to the interface */
2213
2214static void addrconf_add_mroute(struct net_device *dev)
2215{
86872cb5 2216 struct fib6_config cfg = {
ca254490 2217 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_LOCAL,
86872cb5
TG		 2218 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2219 .fc_ifindex = dev->ifindex,
2220 .fc_dst_len = 8,
2221 .fc_flags = RTF_UP,
c346dca1 2222 .fc_nlinfo.nl_net = dev_net(dev),
86872cb5
TG		 2223 };
2224
2225 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
2226
2227 ip6_route_add(&cfg);
1da177e4
LT		 2228}
2229
1da177e4
LT		 2230static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
2231{
2232 struct inet6_dev *idev;
2233
2234 ASSERT_RTNL();
2235
e21e8467
SH		 2236 idev = ipv6_find_idev(dev);
2237 if (!idev)
64e724f6
BH		 2238 return ERR_PTR(-ENOBUFS);
2239
2240 if (idev->cnf.disable_ipv6)
2241 return ERR_PTR(-EACCES);
1da177e4
LT		 2242
2243 /* Add default multicast route */
4af04aba
LW		 2244 if (!(dev->flags & IFF_LOOPBACK))
2245 addrconf_add_mroute(dev);
1da177e4 2246
1da177e4
LT		 2247 return idev;
2248}
2249
53bd6749
JP		 2250static void manage_tempaddrs(struct inet6_dev *idev,
2251 struct inet6_ifaddr *ifp,
2252 __u32 valid_lft, __u32 prefered_lft,
2253 bool create, unsigned long now)
2254{
2255 u32 flags;
2256 struct inet6_ifaddr *ift;
2257
2258 read_lock_bh(&idev->lock);
2259 /* update all temporary addresses in the list */
2260 list_for_each_entry(ift, &idev->tempaddr_list, tmp_list) {
2261 int age, max_valid, max_prefered;
2262
2263 if (ifp != ift->ifpub)
2264 continue;
2265
2266 /* RFC 4941 section 3.3:
2267 * If a received option will extend the lifetime of a public
2268 * address, the lifetimes of temporary addresses should
2269 * be extended, subject to the overall constraint that no
2270 * temporary addresses should ever remain "valid" or "preferred"
2271 * for a time longer than (TEMP_VALID_LIFETIME) or
2272 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), respectively.
2273 */
2274 age = (now - ift->cstamp) / HZ;
2275 max_valid = idev->cnf.temp_valid_lft - age;
2276 if (max_valid < 0)
2277 max_valid = 0;
2278
2279 max_prefered = idev->cnf.temp_prefered_lft -
2280 idev->cnf.max_desync_factor - age;
2281 if (max_prefered < 0)
2282 max_prefered = 0;
2283
2284 if (valid_lft > max_valid)
2285 valid_lft = max_valid;
2286
2287 if (prefered_lft > max_prefered)
2288 prefered_lft = max_prefered;
2289
2290 spin_lock(&ift->lock);
2291 flags = ift->flags;
2292 ift->valid_lft = valid_lft;
2293 ift->prefered_lft = prefered_lft;
2294 ift->tstamp = now;
2295 if (prefered_lft > 0)
2296 ift->flags &= ~IFA_F_DEPRECATED;
2297
2298 spin_unlock(&ift->lock);
2299 if (!(flags&IFA_F_TENTATIVE))
2300 ipv6_ifa_notify(0, ift);
2301 }
2302
2303 if ((create || list_empty(&idev->tempaddr_list)) &&
2304 idev->cnf.use_tempaddr > 0) {
2305 /* When a new public address is created as described
2306 * in [ADDRCONF], also create a new temporary address.
2307 * Also create a temporary address if it's enabled but
2308 * no temporary address currently exists.
2309 */
2310 read_unlock_bh(&idev->lock);
2311 ipv6_create_tempaddr(ifp, NULL);
2312 } else {
2313 read_unlock_bh(&idev->lock);
2314 }
2315}
2316
e6bff995 2317void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao)
1da177e4
LT		 2318{
2319 struct prefix_info *pinfo;
2320 __u32 valid_lft;
2321 __u32 prefered_lft;
2322 int addr_type;
64236f3f 2323 u32 addr_flags = 0;
1da177e4 2324 struct inet6_dev *in6_dev;
56d417b1 2325 struct net *net = dev_net(dev);
1da177e4
LT		 2326
2327 pinfo = (struct prefix_info *) opt;
1ab1457c 2328
1da177e4 2329 if (len < sizeof(struct prefix_info)) {
ba3542e1 2330 ADBG("addrconf: prefix option too short\n");
1da177e4
LT		 2331 return;
2332 }
1ab1457c 2333
1da177e4
LT		 2334 /*
2335 * Validation checks ([ADDRCONF], page 19)
2336 */
2337
2338 addr_type = ipv6_addr_type(&pinfo->prefix);
2339
2340 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
2341 return;
2342
2343 valid_lft = ntohl(pinfo->valid);
2344 prefered_lft = ntohl(pinfo->prefered);
2345
2346 if (prefered_lft > valid_lft) {
e87cc472 2347 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n");
1da177e4
LT		 2348 return;
2349 }
2350
2351 in6_dev = in6_dev_get(dev);
2352
63159f29 2353 if (!in6_dev) {
e87cc472
JP		 2354 net_dbg_ratelimited("addrconf: device %s not configured\n",
2355 dev->name);
1da177e4
LT		 2356 return;
2357 }
2358
2359 /*
2360 * Two things going on here:
2361 * 1) Add routes for on-link prefixes
2362 * 2) Configure prefixes with the auto flag set
2363 */
2364
4bed72e4
YH		 2365 if (pinfo->onlink) {
2366 struct rt6_info *rt;
2367 unsigned long rt_expires;
2368
6f704992
YH		 2369 /* Avoid arithmetic overflow. Really, we could
2370 * save rt_expires in seconds, likely valid_lft,
2371 * but it would require division in fib gc, that it
2372 * not good.
2373 */
4bed72e4
YH		 2374 if (HZ > USER_HZ)
2375 rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
2376 else
2377 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
3dd4bc68 2378
4bed72e4
YH		 2379 if (addrconf_finite_timeout(rt_expires))
2380 rt_expires *= HZ;
1da177e4 2381
14ef37b6
AH		 2382 rt = addrconf_get_prefix_route(&pinfo->prefix,
2383 pinfo->prefix_len,
2384 dev,
2385 RTF_ADDRCONF | RTF_PREFIX_RT,
2386 RTF_GATEWAY | RTF_DEFAULT);
1da177e4 2387
14ef37b6 2388 if (rt) {
6f704992
YH		 2389 /* Autoconf prefix route */
2390 if (valid_lft == 0) {
2391 ip6_del_rt(rt);
2392 rt = NULL;
4bed72e4 2393 } else if (addrconf_finite_timeout(rt_expires)) {
6f704992 2394 /* not infinity */
1716a961 2395 rt6_set_expires(rt, jiffies + rt_expires);
6f704992 2396 } else {
1716a961 2397 rt6_clean_expires(rt);
1da177e4
LT		 2398 }
2399 } else if (valid_lft) {
6f704992 2400 clock_t expires = 0;
4bed72e4
YH		 2401 int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
2402 if (addrconf_finite_timeout(rt_expires)) {
6f704992
YH		 2403 /* not infinity */
2404 flags |= RTF_EXPIRES;
2405 expires = jiffies_to_clock_t(rt_expires);
2406 }
1da177e4 2407 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
6f704992 2408 dev, expires, flags);
1da177e4 2409 }
94e187c0 2410 ip6_rt_put(rt);
1da177e4
LT		 2411 }
2412
2413 /* Try to figure out our local address for this prefix */
2414
2415 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
8e5e8f30 2416 struct inet6_ifaddr *ifp;
1da177e4
LT		 2417 struct in6_addr addr;
2418 int create = 0, update_lft = 0;
617fe29d 2419 bool tokenized = false;
1da177e4
LT		 2420
2421 if (pinfo->prefix_len == 64) {
2422 memcpy(&addr, &pinfo->prefix, 8);
f53adae4
DB		 2423
2424 if (!ipv6_addr_any(&in6_dev->token)) {
2425 read_lock_bh(&in6_dev->lock);
2426 memcpy(addr.s6_addr + 8,
2427 in6_dev->token.s6_addr + 8, 8);
2428 read_unlock_bh(&in6_dev->lock);
617fe29d 2429 tokenized = true;
622c81d5
HFS		 2430 } else if (in6_dev->addr_gen_mode ==
2431 IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
2432 !ipv6_generate_stable_address(&addr, 0,
2433 in6_dev)) {
64236f3f 2434 addr_flags |= IFA_F_STABLE_PRIVACY;
622c81d5 2435 goto ok;
f53adae4
DB		 2436 } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
2437 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
1da177e4
LT		 2438 in6_dev_put(in6_dev);
2439 return;
2440 }
2441 goto ok;
2442 }
e87cc472
JP		 2443 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n",
2444 pinfo->prefix_len);
1da177e4
LT		 2445 in6_dev_put(in6_dev);
2446 return;
2447
2448ok:
2449
53b7997f 2450 ifp = ipv6_get_ifaddr(net, &addr, dev, 1);
1da177e4 2451
63159f29 2452 if (!ifp && valid_lft) {
1da177e4 2453 int max_addresses = in6_dev->cnf.max_addresses;
95c385b4
NH		 2454
2455#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2456 if (in6_dev->cnf.optimistic_dad &&
e6bff995 2457 !net->ipv6.devconf_all->forwarding && sllao)
95c385b4
NH		 2458 addr_flags = IFA_F_OPTIMISTIC;
2459#endif
1da177e4
LT		 2460
2461 /* Do not allow to create too much of autoconfigured
2462 * addresses; this would be too easy way to crash kernel.
2463 */
2464 if (!max_addresses ||
2465 ipv6_count_addresses(in6_dev) < max_addresses)
3f8f5298
JP		 2466 ifp = ipv6_add_addr(in6_dev, &addr, NULL,
2467 pinfo->prefix_len,
95c385b4 2468 addr_type&IPV6_ADDR_SCOPE_MASK,
8a226b2c
JB		 2469 addr_flags, valid_lft,
2470 prefered_lft);
1da177e4 2471
3f0d2ba0 2472 if (IS_ERR_OR_NULL(ifp)) {
1da177e4
LT		 2473 in6_dev_put(in6_dev);
2474 return;
2475 }
2476
8a226b2c
JB		 2477 update_lft = 0;
2478 create = 1;
c15b1cca
HFS		 2479 spin_lock_bh(&ifp->lock);
2480 ifp->flags |= IFA_F_MANAGETEMPADDR;
1da177e4 2481 ifp->cstamp = jiffies;
617fe29d 2482 ifp->tokenized = tokenized;
c15b1cca 2483 spin_unlock_bh(&ifp->lock);
cf22f9a2 2484 addrconf_dad_start(ifp);
1da177e4
LT		 2485 }
2486
2487 if (ifp) {
479840ff 2488 u32 flags;
1da177e4 2489 unsigned long now;
1da177e4
LT		 2490 u32 stored_lft;
2491
2492 /* update lifetime (RFC2462 5.5.3 e) */
8e8e676d 2493 spin_lock_bh(&ifp->lock);
1da177e4
LT		 2494 now = jiffies;
2495 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
2496 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
2497 else
2498 stored_lft = 0;
8a226b2c 2499 if (!update_lft && !create && stored_lft) {
9451a304
FF		 2500 const u32 minimum_lft = min_t(u32,
2501 stored_lft, MIN_VALID_LIFETIME);
c9d55d5b
PM		 2502 valid_lft = max(valid_lft, minimum_lft);
2503
2504 /* RFC4862 Section 5.5.3e:
2505 * "Note that the preferred lifetime of the
2506 * corresponding address is always reset to
2507 * the Preferred Lifetime in the received
2508 * Prefix Information option, regardless of
2509 * whether the valid lifetime is also reset or
2510 * ignored."
2511 *
2512 * So we should always update prefered_lft here.
2513 */
2514 update_lft = 1;
1da177e4
LT		 2515 }
2516
2517 if (update_lft) {
2518 ifp->valid_lft = valid_lft;
2519 ifp->prefered_lft = prefered_lft;
2520 ifp->tstamp = now;
2521 flags = ifp->flags;
2522 ifp->flags &= ~IFA_F_DEPRECATED;
8e8e676d 2523 spin_unlock_bh(&ifp->lock);
1da177e4
LT		 2524
2525 if (!(flags&IFA_F_TENTATIVE))
2526 ipv6_ifa_notify(0, ifp);
2527 } else
8e8e676d 2528 spin_unlock_bh(&ifp->lock);
1da177e4 2529
53bd6749
JP		 2530 manage_tempaddrs(in6_dev, ifp, valid_lft, prefered_lft,
2531 create, now);
5d9efa7e 2532
1da177e4 2533 in6_ifa_put(ifp);
c15b1cca 2534 addrconf_verify();
1da177e4
LT		 2535 }
2536 }
2537 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
2538 in6_dev_put(in6_dev);
2539}
2540
2541/*
2542 * Set destination address.
2543 * Special case for SIT interfaces where we create a new "virtual"
2544 * device.
2545 */
af284937 2546int addrconf_set_dstaddr(struct net *net, void __user *arg)
1da177e4
LT		 2547{
2548 struct in6_ifreq ireq;
2549 struct net_device *dev;
2550 int err = -EINVAL;
2551
2552 rtnl_lock();
2553
2554 err = -EFAULT;
2555 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2556 goto err_exit;
2557
af284937 2558 dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
1da177e4
LT		 2559
2560 err = -ENODEV;
63159f29 2561 if (!dev)
1da177e4
LT		 2562 goto err_exit;
2563
07a93626 2564#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4 2565 if (dev->type == ARPHRD_SIT) {
5bc3eb7e 2566 const struct net_device_ops *ops = dev->netdev_ops;
1da177e4 2567 struct ifreq ifr;
1da177e4
LT		 2568 struct ip_tunnel_parm p;
2569
2570 err = -EADDRNOTAVAIL;
2571 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2572 goto err_exit;
2573
2574 memset(&p, 0, sizeof(p));
2575 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2576 p.iph.saddr = 0;
2577 p.iph.version = 4;
2578 p.iph.ihl = 5;
2579 p.iph.protocol = IPPROTO_IPV6;
2580 p.iph.ttl = 64;
d20b3109 2581 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
1da177e4 2582
5bc3eb7e
SH		 2583 if (ops->ndo_do_ioctl) {
2584 mm_segment_t oldfs = get_fs();
2585
2586 set_fs(KERNEL_DS);
2587 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2588 set_fs(oldfs);
2589 } else
2590 err = -EOPNOTSUPP;
1da177e4
LT		 2591
2592 if (err == 0) {
2593 err = -ENOBUFS;
af284937
DL		 2594 dev = __dev_get_by_name(net, p.name);
2595 if (!dev)
1da177e4
LT		 2596 goto err_exit;
2597 err = dev_open(dev);
2598 }
2599 }
0be669bb 2600#endif
1da177e4
LT		 2601
2602err_exit:
2603 rtnl_unlock();
2604 return err;
2605}
2606
93a714d6
MC		 2607static int ipv6_mc_config(struct sock *sk, bool join,
2608 const struct in6_addr *addr, int ifindex)
2609{
2610 int ret;
2611
2612 ASSERT_RTNL();
2613
2614 lock_sock(sk);
2615 if (join)
54ff9ef3 2616 ret = ipv6_sock_mc_join(sk, ifindex, addr);
93a714d6 2617 else
54ff9ef3 2618 ret = ipv6_sock_mc_drop(sk, ifindex, addr);
93a714d6
MC		 2619 release_sock(sk);
2620
2621 return ret;
2622}
2623
1da177e4
LT		 2624/*
2625 * Manual configuration of address on an interface
2626 */
479840ff
JP		 2627static int inet6_addr_add(struct net *net, int ifindex,
2628 const struct in6_addr *pfx,
caeaba79 2629 const struct in6_addr *peer_pfx,
479840ff
JP		 2630 unsigned int plen, __u32 ifa_flags,
2631 __u32 prefered_lft, __u32 valid_lft)
1da177e4
LT		 2632{
2633 struct inet6_ifaddr *ifp;
2634 struct inet6_dev *idev;
2635 struct net_device *dev;
93a714d6
MC		 2636 unsigned long timeout;
2637 clock_t expires;
1da177e4 2638 int scope;
6f704992 2639 u32 flags;
1da177e4
LT		 2640
2641 ASSERT_RTNL();
1ab1457c 2642
24ef0da7
TG		 2643 if (plen > 128)
2644 return -EINVAL;
2645
0778769d
NT		 2646 /* check the lifetime */
2647 if (!valid_lft || prefered_lft > valid_lft)
2648 return -EINVAL;
2649
53bd6749
JP		 2650 if (ifa_flags & IFA_F_MANAGETEMPADDR && plen != 64)
2651 return -EINVAL;
2652
af284937
DL		 2653 dev = __dev_get_by_index(net, ifindex);
2654 if (!dev)
1da177e4 2655 return -ENODEV;
1ab1457c 2656
64e724f6
BH		 2657 idev = addrconf_add_dev(dev);
2658 if (IS_ERR(idev))
2659 return PTR_ERR(idev);
1da177e4 2660
93a714d6
MC		 2661 if (ifa_flags & IFA_F_MCAUTOJOIN) {
2662 int ret = ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2663 true, pfx, ifindex);
2664
2665 if (ret < 0)
2666 return ret;
2667 }
2668
1da177e4
LT		 2669 scope = ipv6_addr_scope(pfx);
2670
4bed72e4
YH		 2671 timeout = addrconf_timeout_fixup(valid_lft, HZ);
2672 if (addrconf_finite_timeout(timeout)) {
2673 expires = jiffies_to_clock_t(timeout * HZ);
2674 valid_lft = timeout;
6f704992 2675 flags = RTF_EXPIRES;
4bed72e4
YH		 2676 } else {
2677 expires = 0;
2678 flags = 0;
2679 ifa_flags |= IFA_F_PERMANENT;
6f704992 2680 }
0778769d 2681
4bed72e4
YH		 2682 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
2683 if (addrconf_finite_timeout(timeout)) {
2684 if (timeout == 0)
2685 ifa_flags |= IFA_F_DEPRECATED;
2686 prefered_lft = timeout;
2687 }
0778769d 2688
8a226b2c
JB		 2689 ifp = ipv6_add_addr(idev, pfx, peer_pfx, plen, scope, ifa_flags,
2690 valid_lft, prefered_lft);
0778769d 2691
1da177e4 2692 if (!IS_ERR(ifp)) {
761aac73
TH		 2693 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) {
2694 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
2695 expires, flags);
2696 }
2697
95c385b4
NH		 2698 /*
2699 * Note that section 3.1 of RFC 4429 indicates
2700 * that the Optimistic flag should not be set for
2701 * manually configured addresses
2702 */
cf22f9a2 2703 addrconf_dad_start(ifp);
53bd6749
JP		 2704 if (ifa_flags & IFA_F_MANAGETEMPADDR)
2705 manage_tempaddrs(idev, ifp, valid_lft, prefered_lft,
2706 true, jiffies);
1da177e4 2707 in6_ifa_put(ifp);
c15b1cca 2708 addrconf_verify_rtnl();
1da177e4 2709 return 0;
93a714d6
MC		 2710 } else if (ifa_flags & IFA_F_MCAUTOJOIN) {
2711 ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2712 false, pfx, ifindex);
1da177e4
LT		 2713 }
2714
2715 return PTR_ERR(ifp);
2716}
2717
6046d5b4
HK		 2718static int inet6_addr_del(struct net *net, int ifindex, u32 ifa_flags,
2719 const struct in6_addr *pfx, unsigned int plen)
1da177e4
LT		 2720{
2721 struct inet6_ifaddr *ifp;
2722 struct inet6_dev *idev;
2723 struct net_device *dev;
1ab1457c 2724
24ef0da7
TG		 2725 if (plen > 128)
2726 return -EINVAL;
2727
af284937
DL		 2728 dev = __dev_get_by_index(net, ifindex);
2729 if (!dev)
1da177e4
LT		 2730 return -ENODEV;
2731
e5d08d71 2732 idev = __in6_dev_get(dev);
63159f29 2733 if (!idev)
1da177e4
LT		 2734 return -ENXIO;
2735
2736 read_lock_bh(&idev->lock);
502a2ffd 2737 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1da177e4
LT		 2738 if (ifp->prefix_len == plen &&
2739 ipv6_addr_equal(pfx, &ifp->addr)) {
2740 in6_ifa_hold(ifp);
2741 read_unlock_bh(&idev->lock);
1ab1457c 2742
6046d5b4
HK		 2743 if (!(ifp->flags & IFA_F_TEMPORARY) &&
2744 (ifa_flags & IFA_F_MANAGETEMPADDR))
2745 manage_tempaddrs(idev, ifp, 0, 0, false,
2746 jiffies);
1da177e4 2747 ipv6_del_addr(ifp);
6046d5b4 2748 addrconf_verify_rtnl();
93a714d6
MC		 2749 if (ipv6_addr_is_multicast(pfx)) {
2750 ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2751 false, pfx, dev->ifindex);
2752 }
1da177e4
LT		 2753 return 0;
2754 }
2755 }
2756 read_unlock_bh(&idev->lock);
2757 return -EADDRNOTAVAIL;
2758}
2759
2760
af284937 2761int addrconf_add_ifaddr(struct net *net, void __user *arg)
1da177e4
LT		 2762{
2763 struct in6_ifreq ireq;
2764 int err;
1ab1457c 2765
af31f412 2766 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1da177e4 2767 return -EPERM;
1ab1457c 2768
1da177e4
LT		 2769 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2770 return -EFAULT;
2771
2772 rtnl_lock();
caeaba79 2773 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, NULL,
af284937
DL		 2774 ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2775 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
1da177e4
LT		 2776 rtnl_unlock();
2777 return err;
2778}
2779
af284937 2780int addrconf_del_ifaddr(struct net *net, void __user *arg)
1da177e4
LT		 2781{
2782 struct in6_ifreq ireq;
2783 int err;
1ab1457c 2784
af31f412 2785 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1da177e4
LT		 2786 return -EPERM;
2787
2788 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2789 return -EFAULT;
2790
2791 rtnl_lock();
6046d5b4 2792 err = inet6_addr_del(net, ireq.ifr6_ifindex, 0, &ireq.ifr6_addr,
af284937 2793 ireq.ifr6_prefixlen);
1da177e4
LT		 2794 rtnl_unlock();
2795 return err;
2796}
2797
b5f348e5
IJ		 2798static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
2799 int plen, int scope)
2800{
2801 struct inet6_ifaddr *ifp;
2802
8a226b2c 2803 ifp = ipv6_add_addr(idev, addr, NULL, plen,
07edd741
HFS		 2804 scope, IFA_F_PERMANENT,
2805 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
b5f348e5
IJ		 2806 if (!IS_ERR(ifp)) {
2807 spin_lock_bh(&ifp->lock);
2808 ifp->flags &= ~IFA_F_TENTATIVE;
2809 spin_unlock_bh(&ifp->lock);
2810 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2811 in6_ifa_put(ifp);
2812 }
2813}
2814
07a93626 2815#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4
LT		 2816static void sit_add_v4_addrs(struct inet6_dev *idev)
2817{
1da177e4
LT		 2818 struct in6_addr addr;
2819 struct net_device *dev;
c346dca1 2820 struct net *net = dev_net(idev->dev);
929c9cf3 2821 int scope, plen;
f0e2acfa 2822 u32 pflags = 0;
1da177e4
LT		 2823
2824 ASSERT_RTNL();
2825
2826 memset(&addr, 0, sizeof(struct in6_addr));
2827 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2828
2829 if (idev->dev->flags&IFF_POINTOPOINT) {
2830 addr.s6_addr32[0] = htonl(0xfe800000);
2831 scope = IFA_LINK;
929c9cf3 2832 plen = 64;
1da177e4
LT		 2833 } else {
2834 scope = IPV6_ADDR_COMPATv4;
929c9cf3 2835 plen = 96;
f0e2acfa 2836 pflags |= RTF_NONEXTHOP;
1da177e4
LT		 2837 }
2838
2839 if (addr.s6_addr32[3]) {
929c9cf3 2840 add_addr(idev, &addr, plen, scope);
f0e2acfa 2841 addrconf_prefix_route(&addr, plen, idev->dev, 0, pflags);
1da177e4
LT		 2842 return;
2843 }
2844
6fda7350 2845 for_each_netdev(net, dev) {
8e5e8f30 2846 struct in_device *in_dev = __in_dev_get_rtnl(dev);
1da177e4 2847 if (in_dev && (dev->flags & IFF_UP)) {
8e5e8f30 2848 struct in_ifaddr *ifa;
1da177e4
LT		 2849
2850 int flag = scope;
2851
2852 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
1da177e4
LT		 2853
2854 addr.s6_addr32[3] = ifa->ifa_local;
2855
2856 if (ifa->ifa_scope == RT_SCOPE_LINK)
2857 continue;
2858 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2859 if (idev->dev->flags&IFF_POINTOPOINT)
2860 continue;
2861 flag |= IFA_HOST;
2862 }
1da177e4 2863
b5f348e5 2864 add_addr(idev, &addr, plen, flag);
f0e2acfa
ND		 2865 addrconf_prefix_route(&addr, plen, idev->dev, 0,
2866 pflags);
1da177e4
LT		 2867 }
2868 }
1ab1457c 2869 }
1da177e4 2870}
0be669bb 2871#endif
1da177e4
LT		 2872
2873static void init_loopback(struct net_device *dev)
2874{
2875 struct inet6_dev *idev;
25fb6ca4
BK		 2876 struct net_device *sp_dev;
2877 struct inet6_ifaddr *sp_ifa;
2878 struct rt6_info *sp_rt;
1da177e4
LT		 2879
2880 /* ::1 */
2881
2882 ASSERT_RTNL();
2883
e5d08d71 2884 idev = ipv6_find_idev(dev);
63159f29 2885 if (!idev) {
91df42be 2886 pr_debug("%s: add_dev failed\n", __func__);
1da177e4
LT		 2887 return;
2888 }
2889
b5f348e5 2890 add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
25fb6ca4
BK		 2891
2892 /* Add routes to other interface's IPv6 addresses */
2893 for_each_netdev(dev_net(dev), sp_dev) {
2894 if (!strcmp(sp_dev->name, dev->name))
2895 continue;
2896
2897 idev = __in6_dev_get(sp_dev);
2898 if (!idev)
2899 continue;
2900
2901 read_lock_bh(&idev->lock);
2902 list_for_each_entry(sp_ifa, &idev->addr_list, if_list) {
2903
2904 if (sp_ifa->flags & (IFA_F_DADFAILED | IFA_F_TENTATIVE))
2905 continue;
2906
33d99113
G		 2907 if (sp_ifa->rt) {
2908 /* This dst has been added to garbage list when
2909 * lo device down, release this obsolete dst and
2910 * reallocate a new router for ifa.
2911 */
2912 if (sp_ifa->rt->dst.obsolete > 0) {
2913 ip6_rt_put(sp_ifa->rt);
2914 sp_ifa->rt = NULL;
2915 } else {
2916 continue;
2917 }
2918 }
a881ae1f 2919
57ec0afe 2920 sp_rt = addrconf_dst_alloc(idev, &sp_ifa->addr, false);
25fb6ca4
BK		 2921
2922 /* Failure cases are ignored */
534c8779
G		 2923 if (!IS_ERR(sp_rt)) {
2924 sp_ifa->rt = sp_rt;
25fb6ca4 2925 ip6_ins_rt(sp_rt);
534c8779 2926 }
25fb6ca4
BK		 2927 }
2928 read_unlock_bh(&idev->lock);
2929 }
1da177e4
LT		 2930}
2931
64236f3f
HFS		 2932static void addrconf_add_linklocal(struct inet6_dev *idev,
2933 const struct in6_addr *addr, u32 flags)
1da177e4 2934{
8e5e8f30 2935 struct inet6_ifaddr *ifp;
64236f3f 2936 u32 addr_flags = flags | IFA_F_PERMANENT;
95c385b4
NH		 2937
2938#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2939 if (idev->cnf.optimistic_dad &&
702beb87 2940 !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
95c385b4
NH		 2941 addr_flags |= IFA_F_OPTIMISTIC;
2942#endif
1da177e4 2943
07edd741
HFS		 2944 ifp = ipv6_add_addr(idev, addr, NULL, 64, IFA_LINK, addr_flags,
2945 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
1da177e4 2946 if (!IS_ERR(ifp)) {
46d48046 2947 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
cf22f9a2 2948 addrconf_dad_start(ifp);
1da177e4
LT		 2949 in6_ifa_put(ifp);
2950 }
2951}
2952
622c81d5
HFS		 2953static bool ipv6_reserved_interfaceid(struct in6_addr address)
2954{
2955 if ((address.s6_addr32[2] | address.s6_addr32[3]) == 0)
2956 return true;
2957
2958 if (address.s6_addr32[2] == htonl(0x02005eff) &&
2959 ((address.s6_addr32[3] & htonl(0xfe000000)) == htonl(0xfe000000)))
2960 return true;
2961
2962 if (address.s6_addr32[2] == htonl(0xfdffffff) &&
2963 ((address.s6_addr32[3] & htonl(0xffffff80)) == htonl(0xffffff80)))
2964 return true;
2965
2966 return false;
2967}
2968
2969static int ipv6_generate_stable_address(struct in6_addr *address,
2970 u8 dad_count,
2971 const struct inet6_dev *idev)
2972{
622c81d5
HFS		 2973 static DEFINE_SPINLOCK(lock);
2974 static __u32 digest[SHA_DIGEST_WORDS];
2975 static __u32 workspace[SHA_WORKSPACE_WORDS];
2976
2977 static union {
2978 char __data[SHA_MESSAGE_BYTES];
2979 struct {
2980 struct in6_addr secret;
ff40217e 2981 __be32 prefix[2];
622c81d5
HFS		 2982 unsigned char hwaddr[MAX_ADDR_LEN];
2983 u8 dad_count;
2984 } __packed;
2985 } data;
2986
2987 struct in6_addr secret;
2988 struct in6_addr temp;
2989 struct net *net = dev_net(idev->dev);
2990
2991 BUILD_BUG_ON(sizeof(data.__data) != sizeof(data));
2992
2993 if (idev->cnf.stable_secret.initialized)
2994 secret = idev->cnf.stable_secret.secret;
2995 else if (net->ipv6.devconf_dflt->stable_secret.initialized)
2996 secret = net->ipv6.devconf_dflt->stable_secret.secret;
2997 else
2998 return -1;
2999
3000retry:
3001 spin_lock_bh(&lock);
3002
3003 sha_init(digest);
3004 memset(&data, 0, sizeof(data));
3005 memset(workspace, 0, sizeof(workspace));
3006 memcpy(data.hwaddr, idev->dev->perm_addr, idev->dev->addr_len);
ff40217e
HFS		 3007 data.prefix[0] = address->s6_addr32[0];
3008 data.prefix[1] = address->s6_addr32[1];
622c81d5
HFS		 3009 data.secret = secret;
3010 data.dad_count = dad_count;
3011
3012 sha_transform(digest, data.__data, workspace);
3013
3014 temp = *address;
ff40217e
HFS		 3015 temp.s6_addr32[2] = (__force __be32)digest[0];
3016 temp.s6_addr32[3] = (__force __be32)digest[1];
622c81d5
HFS		 3017
3018 spin_unlock_bh(&lock);
3019
3020 if (ipv6_reserved_interfaceid(temp)) {
3021 dad_count++;
1855b7c3 3022 if (dad_count > dev_net(idev->dev)->ipv6.sysctl.idgen_retries)
622c81d5
HFS		 3023 return -1;
3024 goto retry;
3025 }
3026
3027 *address = temp;
3028 return 0;
3029}
3030
bc91b0f0
JP		 3031static void addrconf_addr_gen(struct inet6_dev *idev, bool prefix_route)
3032{
622c81d5
HFS		 3033 struct in6_addr addr;
3034
ca254490
DA		 3035 /* no link local addresses on L3 master devices */
3036 if (netif_is_l3_master(idev->dev))
3037 return;
3038
622c81d5 3039 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
bc91b0f0 3040
622c81d5
HFS		 3041 if (idev->addr_gen_mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY) {
3042 if (!ipv6_generate_stable_address(&addr, 0, idev))
64236f3f
HFS		 3043 addrconf_add_linklocal(idev, &addr,
3044 IFA_F_STABLE_PRIVACY);
622c81d5
HFS		 3045 else if (prefix_route)
3046 addrconf_prefix_route(&addr, 64, idev->dev, 0, 0);
3047 } else if (idev->addr_gen_mode == IN6_ADDR_GEN_MODE_EUI64) {
bc91b0f0
JP		 3048 /* addrconf_add_linklocal also adds a prefix_route and we
3049 * only need to care about prefix routes if ipv6_generate_eui64
3050 * couldn't generate one.
3051 */
3052 if (ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) == 0)
64236f3f 3053 addrconf_add_linklocal(idev, &addr, 0);
bc91b0f0
JP		 3054 else if (prefix_route)
3055 addrconf_prefix_route(&addr, 64, idev->dev, 0, 0);
3056 }
3057}
3058
1da177e4
LT		 3059static void addrconf_dev_config(struct net_device *dev)
3060{
8e5e8f30 3061 struct inet6_dev *idev;
1da177e4
LT		 3062
3063 ASSERT_RTNL();
3064
74235a25
HX		 3065 if ((dev->type != ARPHRD_ETHER) &&
3066 (dev->type != ARPHRD_FDDI) &&
74235a25 3067 (dev->type != ARPHRD_ARCNET) &&
06a4c1c5 3068 (dev->type != ARPHRD_INFINIBAND) &&
cb6bf355 3069 (dev->type != ARPHRD_IEEE802154) &&
e837735e 3070 (dev->type != ARPHRD_IEEE1394) &&
e74bccb8
JR		 3071 (dev->type != ARPHRD_TUNNEL6) &&
3072 (dev->type != ARPHRD_6LOWPAN)) {
74235a25
HX		 3073 /* Alas, we support only Ethernet autoconfiguration. */
3074 return;
3075 }
3076
1da177e4 3077 idev = addrconf_add_dev(dev);
64e724f6 3078 if (IS_ERR(idev))
1da177e4
LT		 3079 return;
3080
bc91b0f0 3081 addrconf_addr_gen(idev, false);
1da177e4
LT		 3082}
3083
07a93626 3084#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4
LT		 3085static void addrconf_sit_config(struct net_device *dev)
3086{
3087 struct inet6_dev *idev;
3088
3089 ASSERT_RTNL();
3090
1ab1457c
YH		 3091 /*
3092 * Configure the tunnel with one of our IPv4
3093 * addresses... we should configure all of
1da177e4
LT		 3094 * our v4 addrs in the tunnel
3095 */
3096
e5d08d71 3097 idev = ipv6_find_idev(dev);
63159f29 3098 if (!idev) {
91df42be 3099 pr_debug("%s: add_dev failed\n", __func__);
1da177e4
LT		 3100 return;
3101 }
3102
c7dc89c0 3103 if (dev->priv_flags & IFF_ISATAP) {
bc91b0f0 3104 addrconf_addr_gen(idev, false);
c7dc89c0
FT		 3105 return;
3106 }
3107
1da177e4
LT		 3108 sit_add_v4_addrs(idev);
3109
62b54dd9 3110 if (dev->flags&IFF_POINTOPOINT)
1da177e4 3111 addrconf_add_mroute(dev);
1da177e4 3112}
0be669bb 3113#endif
1da177e4 3114
07a93626 3115#if IS_ENABLED(CONFIG_NET_IPGRE)
aee80b54 3116static void addrconf_gre_config(struct net_device *dev)
3117{
3118 struct inet6_dev *idev;
aee80b54 3119
aee80b54 3120 ASSERT_RTNL();
3121
e5d08d71 3122 idev = ipv6_find_idev(dev);
63159f29 3123 if (!idev) {
91df42be 3124 pr_debug("%s: add_dev failed\n", __func__);
aee80b54 3125 return;
3126 }
3127
bc91b0f0 3128 addrconf_addr_gen(idev, true);
d9e4ce65
HFS		 3129 if (dev->flags & IFF_POINTOPOINT)
3130 addrconf_add_mroute(dev);
aee80b54 3131}
3132#endif
3133
1ab1457c 3134static int addrconf_notify(struct notifier_block *this, unsigned long event,
351638e7 3135 void *ptr)
1da177e4 3136{
351638e7 3137 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
748e2d93 3138 struct inet6_dev *idev = __in6_dev_get(dev);
c5e33bdd 3139 int run_pending = 0;
b217d616 3140 int err;
1da177e4 3141
e21e8467 3142 switch (event) {
45ba9dd2 3143 case NETDEV_REGISTER:
74235a25 3144 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
45ba9dd2 3145 idev = ipv6_add_dev(dev);
a317a2f1
WC		 3146 if (IS_ERR(idev))
3147 return notifier_from_errno(PTR_ERR(idev));
45ba9dd2
YH		 3148 }
3149 break;
bcdd553f 3150
b7b0b1d2
AD		 3151 case NETDEV_CHANGEMTU:
3152 /* if MTU under IPV6_MIN_MTU stop IPv6 on this interface. */
3153 if (dev->mtu < IPV6_MIN_MTU) {
3154 addrconf_ifdown(dev, 1);
3155 break;
3156 }
3157
3158 if (idev) {
3159 rt6_mtu_change(dev, dev->mtu);
3160 idev->cnf.mtu6 = dev->mtu;
3161 break;
3162 }
3163
3164 /* allocate new idev */
3165 idev = ipv6_add_dev(dev);
3166 if (IS_ERR(idev))
3167 break;
3168
3169 /* device is still not ready */
3170 if (!(idev->if_flags & IF_READY))
3171 break;
3172
3173 run_pending = 1;
3174
3175 /* fall through */
3176
1da177e4 3177 case NETDEV_UP:
3c21edbd 3178 case NETDEV_CHANGE:
c2edacf8
JV		 3179 if (dev->flags & IFF_SLAVE)
3180 break;
3181
3ce62a84
WC		 3182 if (idev && idev->cnf.disable_ipv6)
3183 break;
3184
3c21edbd 3185 if (event == NETDEV_UP) {
f24e3d65 3186 if (!addrconf_qdisc_ok(dev)) {
3c21edbd 3187 /* device is not ready yet. */
f3213831 3188 pr_info("ADDRCONF(NETDEV_UP): %s: link is not ready\n",
3c21edbd
YH		 3189 dev->name);
3190 break;
3191 }
99081049 3192
d31c7b8f
EP		 3193 if (!idev && dev->mtu >= IPV6_MIN_MTU)
3194 idev = ipv6_add_dev(dev);
3195
a317a2f1 3196 if (!IS_ERR_OR_NULL(idev)) {
99081049 3197 idev->if_flags |= IF_READY;
e3ec6cfc
BT		 3198 run_pending = 1;
3199 }
b7b0b1d2 3200 } else if (event == NETDEV_CHANGE) {
f24e3d65 3201 if (!addrconf_qdisc_ok(dev)) {
3c21edbd
YH		 3202 /* device is still not ready. */
3203 break;
3204 }
3205
3206 if (idev) {
bcdd553f 3207 if (idev->if_flags & IF_READY)
3c21edbd
YH		 3208 /* device is already configured. */
3209 break;
3c21edbd
YH		 3210 idev->if_flags |= IF_READY;
3211 }
3212
f3213831
JP		 3213 pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n",
3214 dev->name);
3c21edbd 3215
c5e33bdd 3216 run_pending = 1;
3c21edbd
YH		 3217 }
3218
e21e8467 3219 switch (dev->type) {
07a93626 3220#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4
LT		 3221 case ARPHRD_SIT:
3222 addrconf_sit_config(dev);
3223 break;
aee80b54 3224#endif
07a93626 3225#if IS_ENABLED(CONFIG_NET_IPGRE)
aee80b54 3226 case ARPHRD_IPGRE:
3227 addrconf_gre_config(dev);
3228 break;
0be669bb 3229#endif
1da177e4
LT		 3230 case ARPHRD_LOOPBACK:
3231 init_loopback(dev);
3232 break;
3233
3234 default:
3235 addrconf_dev_config(dev);
3236 break;
3ff50b79 3237 }
bcdd553f 3238
a317a2f1 3239 if (!IS_ERR_OR_NULL(idev)) {
c5e33bdd
YH		 3240 if (run_pending)
3241 addrconf_dad_run(idev);
3242
bcdd553f
SH		 3243 /*
3244 * If the MTU changed during the interface down,
3245 * when the interface up, the changed MTU must be
3246 * reflected in the idev as well as routers.
1da177e4 3247 */
bcdd553f
SH		 3248 if (idev->cnf.mtu6 != dev->mtu &&
3249 dev->mtu >= IPV6_MIN_MTU) {
1da177e4
LT		 3250 rt6_mtu_change(dev, dev->mtu);
3251 idev->cnf.mtu6 = dev->mtu;
3252 }
3253 idev->tstamp = jiffies;
3254 inet6_ifinfo_notify(RTM_NEWLINK, idev);
bcdd553f
SH		 3255
3256 /*
3257 * If the changed mtu during down is lower than
3258 * IPV6_MIN_MTU stop IPv6 on this interface.
1da177e4
LT		 3259 */
3260 if (dev->mtu < IPV6_MIN_MTU)
bcdd553f 3261 addrconf_ifdown(dev, 1);
1da177e4
LT		 3262 }
3263 break;
3264
1da177e4
LT		 3265 case NETDEV_DOWN:
3266 case NETDEV_UNREGISTER:
3267 /*
3268 * Remove all addresses from this interface.
3269 */
3270 addrconf_ifdown(dev, event != NETDEV_DOWN);
3271 break;
3c21edbd 3272
1da177e4 3273 case NETDEV_CHANGENAME:
1da177e4 3274 if (idev) {
5632c515 3275 snmp6_unregister_dev(idev);
408c4768 3276 addrconf_sysctl_unregister(idev);
a317a2f1 3277 err = addrconf_sysctl_register(idev);
b217d616
HX		 3278 if (err)
3279 return notifier_from_errno(err);
a317a2f1
WC		 3280 err = snmp6_register_dev(idev);
3281 if (err) {
3282 addrconf_sysctl_unregister(idev);
3283 return notifier_from_errno(err);
3284 }
5632c515 3285 }
1da177e4 3286 break;
bcdd553f 3287
93d9b7d7
JP		 3288 case NETDEV_PRE_TYPE_CHANGE:
3289 case NETDEV_POST_TYPE_CHANGE:
3290 addrconf_type_change(dev, event);
75c78500 3291 break;
3ff50b79 3292 }
1da177e4
LT		 3293
3294 return NOTIFY_OK;
3295}
3296
3297/*
3298 * addrconf module should be notified of a device going up
3299 */
3300static struct notifier_block ipv6_dev_notf = {
3301 .notifier_call = addrconf_notify,
1da177e4
LT		 3302};
3303
93d9b7d7 3304static void addrconf_type_change(struct net_device *dev, unsigned long event)
75c78500
MS		 3305{
3306 struct inet6_dev *idev;
3307 ASSERT_RTNL();
3308
3309 idev = __in6_dev_get(dev);
3310
93d9b7d7 3311 if (event == NETDEV_POST_TYPE_CHANGE)
75c78500 3312 ipv6_mc_remap(idev);
93d9b7d7 3313 else if (event == NETDEV_PRE_TYPE_CHANGE)
75c78500
MS		 3314 ipv6_mc_unmap(idev);
3315}
3316
1da177e4
LT		 3317static int addrconf_ifdown(struct net_device *dev, int how)
3318{
c346dca1 3319 struct net *net = dev_net(dev);
502a2ffd 3320 struct inet6_dev *idev;
3321 struct inet6_ifaddr *ifa;
73a8bd74 3322 int state, i;
1da177e4
LT		 3323
3324 ASSERT_RTNL();
3325
73a8bd74
DM		 3326 rt6_ifdown(net, dev);
3327 neigh_ifdown(&nd_tbl, dev);
1da177e4
LT		 3328
3329 idev = __in6_dev_get(dev);
63159f29 3330 if (!idev)
1da177e4
LT		 3331 return -ENODEV;
3332
bcdd553f
SH		 3333 /*
3334 * Step 1: remove reference to ipv6 device from parent device.
3335 * Do not dev_put!
1da177e4 3336 */
439e2385 3337 if (how) {
1da177e4 3338 idev->dead = 1;
8814c4b5
YH		 3339
3340 /* protected by rtnl_lock */
a9b3cd7f 3341 RCU_INIT_POINTER(dev->ip6_ptr, NULL);
1da177e4
LT		 3342
3343 /* Step 1.5: remove snmp6 entry */
3344 snmp6_unregister_dev(idev);
3345
3346 }
3347
73a8bd74
DM		 3348 /* Step 2: clear hash table */
3349 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3350 struct hlist_head *h = &inet6_addr_lst[i];
73a8bd74
DM		 3351
3352 spin_lock_bh(&addrconf_hash_lock);
67ba4152 3353restart:
b67bfe0d 3354 hlist_for_each_entry_rcu(ifa, h, addr_lst) {
73a8bd74
DM		 3355 if (ifa->idev == idev) {
3356 hlist_del_init_rcu(&ifa->addr_lst);
c15b1cca 3357 addrconf_del_dad_work(ifa);
73a8bd74
DM		 3358 goto restart;
3359 }
3360 }
3361 spin_unlock_bh(&addrconf_hash_lock);
3362 }
3363
1da177e4
LT		 3364 write_lock_bh(&idev->lock);
3365
b7b1bfce
HFS		 3366 addrconf_del_rs_timer(idev);
3367
bcdd553f 3368 /* Step 2: clear flags for stateless addrconf */
439e2385 3369 if (!how)
3c21edbd 3370 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
1da177e4 3371
439e2385 3372 if (how && del_timer(&idev->regen_timer))
1da177e4
LT		 3373 in6_dev_put(idev);
3374
bcdd553f 3375 /* Step 3: clear tempaddr list */
372e6c8f 3376 while (!list_empty(&idev->tempaddr_list)) {
3377 ifa = list_first_entry(&idev->tempaddr_list,
3378 struct inet6_ifaddr, tmp_list);
3379 list_del(&ifa->tmp_list);
1da177e4
LT		 3380 write_unlock_bh(&idev->lock);
3381 spin_lock_bh(&ifa->lock);
3382
3383 if (ifa->ifpub) {
3384 in6_ifa_put(ifa->ifpub);
3385 ifa->ifpub = NULL;
3386 }
3387 spin_unlock_bh(&ifa->lock);
3388 in6_ifa_put(ifa);
3389 write_lock_bh(&idev->lock);
3390 }
8f37ada5 3391
502a2ffd 3392 while (!list_empty(&idev->addr_list)) {
3393 ifa = list_first_entry(&idev->addr_list,
3394 struct inet6_ifaddr, if_list);
c15b1cca 3395 addrconf_del_dad_work(ifa);
84e8b803 3396
73a8bd74 3397 list_del(&ifa->if_list);
84e8b803 3398
73a8bd74 3399 write_unlock_bh(&idev->lock);
84e8b803 3400
8e8e676d 3401 spin_lock_bh(&ifa->lock);
73a8bd74
DM		 3402 state = ifa->state;
3403 ifa->state = INET6_IFADDR_STATE_DEAD;
8e8e676d 3404 spin_unlock_bh(&ifa->lock);
9d82ca98 3405
73a8bd74
DM		 3406 if (state != INET6_IFADDR_STATE_DEAD) {
3407 __ipv6_ifa_notify(RTM_DELADDR, ifa);
f88c91dd 3408 inet6addr_notifier_call_chain(NETDEV_DOWN, ifa);
27bdb2ab 3409 }
73a8bd74 3410 in6_ifa_put(ifa);
8f37ada5 3411
73a8bd74
DM		 3412 write_lock_bh(&idev->lock);
3413 }
8f37ada5 3414
1da177e4
LT		 3415 write_unlock_bh(&idev->lock);
3416
381f4dca
SD		 3417 /* Step 5: Discard anycast and multicast list */
3418 if (how) {
3419 ipv6_ac_destroy_dev(idev);
1da177e4 3420 ipv6_mc_destroy_dev(idev);
381f4dca 3421 } else {
1da177e4 3422 ipv6_mc_down(idev);
381f4dca 3423 }
1da177e4 3424
1da177e4 3425 idev->tstamp = jiffies;
1ab1457c 3426
bcdd553f 3427 /* Last: Shot the device (if unregistered) */
439e2385 3428 if (how) {
408c4768 3429 addrconf_sysctl_unregister(idev);
1da177e4
LT		 3430 neigh_parms_release(&nd_tbl, idev->nd_parms);
3431 neigh_ifdown(&nd_tbl, dev);
3432 in6_dev_put(idev);
3433 }
3434 return 0;
3435}
3436
3437static void addrconf_rs_timer(unsigned long data)
3438{
b7b1bfce 3439 struct inet6_dev *idev = (struct inet6_dev *)data;
caf92bc4 3440 struct net_device *dev = idev->dev;
b7b1bfce 3441 struct in6_addr lladdr;
1da177e4 3442
b7b1bfce 3443 write_lock(&idev->lock);
5b2a1953 3444 if (idev->dead || !(idev->if_flags & IF_READY))
1da177e4
LT		 3445 goto out;
3446
9ba2add3 3447 if (!ipv6_accept_ra(idev))
5b2a1953 3448 goto out;
3449
3450 /* Announcement received after solicitation was sent */
3451 if (idev->if_flags & IF_RA_RCVD)
1da177e4 3452 goto out;
1da177e4 3453
b7b1bfce 3454 if (idev->rs_probes++ < idev->cnf.rtr_solicits) {
caf92bc4
CW		 3455 write_unlock(&idev->lock);
3456 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
3457 ndisc_send_rs(dev, &lladdr,
b7b1bfce
HFS		 3458 &in6addr_linklocal_allrouters);
3459 else
caf92bc4 3460 goto put;
1da177e4 3461
caf92bc4 3462 write_lock(&idev->lock);
b7b1bfce
HFS		 3463 /* The wait after the last probe can be shorter */
3464 addrconf_mod_rs_timer(idev, (idev->rs_probes ==
3465 idev->cnf.rtr_solicits) ?
3466 idev->cnf.rtr_solicit_delay :
3467 idev->cnf.rtr_solicit_interval);
1da177e4 3468 } else {
1da177e4
LT		 3469 /*
3470 * Note: we do not support deprecated "all on-link"
3471 * assumption any longer.
3472 */
91df42be 3473 pr_debug("%s: no IPv6 routers present\n", idev->dev->name);
1da177e4
LT		 3474 }
3475
3476out:
b7b1bfce 3477 write_unlock(&idev->lock);
caf92bc4 3478put:
b7b1bfce 3479 in6_dev_put(idev);
1da177e4
LT		 3480}
3481
3482/*
3483 * Duplicate Address Detection
3484 */
3c21edbd
YH		 3485static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
3486{
3487 unsigned long rand_num;
3488 struct inet6_dev *idev = ifp->idev;
3489
95c385b4
NH		 3490 if (ifp->flags & IFA_F_OPTIMISTIC)
3491 rand_num = 0;
3492 else
63862b5b 3493 rand_num = prandom_u32() % (idev->cnf.rtr_solicit_delay ? : 1);
95c385b4 3494
b7b1bfce 3495 ifp->dad_probes = idev->cnf.dad_transmits;
c15b1cca 3496 addrconf_mod_dad_work(ifp, rand_num);
3c21edbd
YH		 3497}
3498
c15b1cca 3499static void addrconf_dad_begin(struct inet6_ifaddr *ifp)
1da177e4
LT		 3500{
3501 struct inet6_dev *idev = ifp->idev;
3502 struct net_device *dev = idev->dev;
1da177e4
LT		 3503
3504 addrconf_join_solict(dev, &ifp->addr);
3505
63862b5b 3506 prandom_seed((__force u32) ifp->addr.s6_addr32[3]);
1da177e4
LT		 3507
3508 read_lock_bh(&idev->lock);
622ccdf1 3509 spin_lock(&ifp->lock);
e9d3e084 3510 if (ifp->state == INET6_IFADDR_STATE_DEAD)
1da177e4 3511 goto out;
1da177e4
LT		 3512
3513 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
1b34be74 3514 idev->cnf.accept_dad < 1 ||
55ebaef1
NT		 3515 !(ifp->flags&IFA_F_TENTATIVE) ||
3516 ifp->flags & IFA_F_NODAD) {
cc411d0b 3517 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
21809faf 3518 spin_unlock(&ifp->lock);
1da177e4
LT		 3519 read_unlock_bh(&idev->lock);
3520
3521 addrconf_dad_completed(ifp);
3522 return;
3523 }
3524
6732bade 3525 if (!(idev->if_flags & IF_READY)) {
21809faf 3526 spin_unlock(&ifp->lock);
6732bade 3527 read_unlock_bh(&idev->lock);
3c21edbd 3528 /*
590a9887 3529 * If the device is not ready:
3c21edbd
YH		 3530 * - keep it tentative if it is a permanent address.
3531 * - otherwise, kill it.
3532 */
3533 in6_ifa_hold(ifp);
cc411d0b 3534 addrconf_dad_stop(ifp, 0);
6732bade 3535 return;
3c21edbd 3536 }
95c385b4
NH		 3537
3538 /*
3539 * Optimistic nodes can start receiving
3540 * Frames right away
3541 */
7fd2561e 3542 if (ifp->flags & IFA_F_OPTIMISTIC) {
95c385b4 3543 ip6_ins_rt(ifp->rt);
7fd2561e
EK		 3544 if (ipv6_use_optimistic_addr(idev)) {
3545 /* Because optimistic nodes can use this address,
3546 * notify listeners. If DAD fails, RTM_DELADDR is sent.
3547 */
3548 ipv6_ifa_notify(RTM_NEWADDR, ifp);
3549 }
3550 }
95c385b4 3551
6732bade 3552 addrconf_dad_kick(ifp);
1da177e4 3553out:
622ccdf1 3554 spin_unlock(&ifp->lock);
1da177e4
LT		 3555 read_unlock_bh(&idev->lock);
3556}
3557
c15b1cca 3558static void addrconf_dad_start(struct inet6_ifaddr *ifp)
1da177e4 3559{
c15b1cca
HFS		 3560 bool begin_dad = false;
3561
8e8e676d 3562 spin_lock_bh(&ifp->lock);
c15b1cca
HFS		 3563 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
3564 ifp->state = INET6_IFADDR_STATE_PREDAD;
3565 begin_dad = true;
3566 }
8e8e676d 3567 spin_unlock_bh(&ifp->lock);
c15b1cca
HFS		 3568
3569 if (begin_dad)
3570 addrconf_mod_dad_work(ifp, 0);
3571}
3572
3573static void addrconf_dad_work(struct work_struct *w)
3574{
3575 struct inet6_ifaddr *ifp = container_of(to_delayed_work(w),
3576 struct inet6_ifaddr,
3577 dad_work);
1da177e4 3578 struct inet6_dev *idev = ifp->idev;
1da177e4
LT		 3579 struct in6_addr mcaddr;
3580
c15b1cca
HFS		 3581 enum {
3582 DAD_PROCESS,
3583 DAD_BEGIN,
3584 DAD_ABORT,
3585 } action = DAD_PROCESS;
3586
3587 rtnl_lock();
3588
8e8e676d 3589 spin_lock_bh(&ifp->lock);
c15b1cca
HFS		 3590 if (ifp->state == INET6_IFADDR_STATE_PREDAD) {
3591 action = DAD_BEGIN;
3592 ifp->state = INET6_IFADDR_STATE_DAD;
3593 } else if (ifp->state == INET6_IFADDR_STATE_ERRDAD) {
3594 action = DAD_ABORT;
3595 ifp->state = INET6_IFADDR_STATE_POSTDAD;
3596 }
8e8e676d 3597 spin_unlock_bh(&ifp->lock);
c15b1cca
HFS		 3598
3599 if (action == DAD_BEGIN) {
3600 addrconf_dad_begin(ifp);
3601 goto out;
3602 } else if (action == DAD_ABORT) {
3603 addrconf_dad_stop(ifp, 1);
3604 goto out;
3605 }
3606
b7b1bfce 3607 if (!ifp->dad_probes && addrconf_dad_end(ifp))
f2344a13
HX		 3608 goto out;
3609
c15b1cca 3610 write_lock_bh(&idev->lock);
122e4519 3611 if (idev->dead || !(idev->if_flags & IF_READY)) {
c15b1cca 3612 write_unlock_bh(&idev->lock);
1da177e4
LT		 3613 goto out;
3614 }
21809faf 3615
3616 spin_lock(&ifp->lock);
622ccdf1
HX		 3617 if (ifp->state == INET6_IFADDR_STATE_DEAD) {
3618 spin_unlock(&ifp->lock);
c15b1cca 3619 write_unlock_bh(&idev->lock);
622ccdf1
HX		 3620 goto out;
3621 }
3622
b7b1bfce 3623 if (ifp->dad_probes == 0) {
1da177e4
LT		 3624 /*
3625 * DAD was successful
3626 */
3627
cc411d0b 3628 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
21809faf 3629 spin_unlock(&ifp->lock);
c15b1cca 3630 write_unlock_bh(&idev->lock);
1da177e4
LT		 3631
3632 addrconf_dad_completed(ifp);
3633
3634 goto out;
3635 }
3636
b7b1bfce 3637 ifp->dad_probes--;
c15b1cca
HFS		 3638 addrconf_mod_dad_work(ifp,
3639 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME));
21809faf 3640 spin_unlock(&ifp->lock);
c15b1cca 3641 write_unlock_bh(&idev->lock);
1da177e4
LT		 3642
3643 /* send a neighbour solicitation for our addr */
1da177e4 3644 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
38cf595b 3645 ndisc_send_ns(ifp->idev->dev, &ifp->addr, &mcaddr, &in6addr_any, NULL);
1da177e4
LT		 3646out:
3647 in6_ifa_put(ifp);
c15b1cca 3648 rtnl_unlock();
1da177e4
LT		 3649}
3650
11ffff75
HFS		 3651/* ifp->idev must be at least read locked */
3652static bool ipv6_lonely_lladdr(struct inet6_ifaddr *ifp)
3653{
3654 struct inet6_ifaddr *ifpiter;
3655 struct inet6_dev *idev = ifp->idev;
3656
602582ca
HFS		 3657 list_for_each_entry_reverse(ifpiter, &idev->addr_list, if_list) {
3658 if (ifpiter->scope > IFA_LINK)
3659 break;
11ffff75
HFS		 3660 if (ifp != ifpiter && ifpiter->scope == IFA_LINK &&
3661 (ifpiter->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE|
3662 IFA_F_OPTIMISTIC|IFA_F_DADFAILED)) ==
3663 IFA_F_PERMANENT)
3664 return false;
3665 }
3666 return true;
3667}
3668
1da177e4
LT		 3669static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
3670{
e21e8467 3671 struct net_device *dev = ifp->idev->dev;
b7b1bfce 3672 struct in6_addr lladdr;
b173ee48 3673 bool send_rs, send_mld;
b7b1bfce 3674
c15b1cca 3675 addrconf_del_dad_work(ifp);
1da177e4
LT		 3676
3677 /*
3678 * Configure the address for reception. Now it is valid.
3679 */
3680
3681 ipv6_ifa_notify(RTM_NEWADDR, ifp);
3682
026359bc
TA		 3683 /* If added prefix is link local and we are prepared to process
3684 router advertisements, start sending router solicitations.
1da177e4
LT		 3685 */
3686
1ec047eb 3687 read_lock_bh(&ifp->idev->lock);
11ffff75 3688 send_mld = ifp->scope == IFA_LINK && ipv6_lonely_lladdr(ifp);
b173ee48
HFS		 3689 send_rs = send_mld &&
3690 ipv6_accept_ra(ifp->idev) &&
1ec047eb 3691 ifp->idev->cnf.rtr_solicits > 0 &&
b173ee48 3692 (dev->flags&IFF_LOOPBACK) == 0;
1ec047eb
HFS		 3693 read_unlock_bh(&ifp->idev->lock);
3694
b173ee48
HFS		 3695 /* While dad is in progress mld report's source address is in6_addrany.
3696 * Resend with proper ll now.
3697 */
3698 if (send_mld)
3699 ipv6_mc_dad_complete(ifp->idev);
3700
1ec047eb 3701 if (send_rs) {
1da177e4
LT		 3702 /*
3703 * If a host as already performed a random delay
3704 * [...] as part of DAD [...] there is no need
3705 * to delay again before sending the first RS
3706 */
1ec047eb 3707 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
b7b1bfce 3708 return;
1ec047eb 3709 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters);
1da177e4 3710
b7b1bfce
HFS		 3711 write_lock_bh(&ifp->idev->lock);
3712 spin_lock(&ifp->lock);
3713 ifp->idev->rs_probes = 1;
1da177e4 3714 ifp->idev->if_flags |= IF_RS_SENT;
b7b1bfce
HFS		 3715 addrconf_mod_rs_timer(ifp->idev,
3716 ifp->idev->cnf.rtr_solicit_interval);
3717 spin_unlock(&ifp->lock);
3718 write_unlock_bh(&ifp->idev->lock);
1da177e4
LT		 3719 }
3720}
3721
e21e8467
SH		 3722static void addrconf_dad_run(struct inet6_dev *idev)
3723{
c5e33bdd
YH		 3724 struct inet6_ifaddr *ifp;
3725
3726 read_lock_bh(&idev->lock);
502a2ffd 3727 list_for_each_entry(ifp, &idev->addr_list, if_list) {
21809faf 3728 spin_lock(&ifp->lock);
f2344a13
HX		 3729 if (ifp->flags & IFA_F_TENTATIVE &&
3730 ifp->state == INET6_IFADDR_STATE_DAD)
3731 addrconf_dad_kick(ifp);
21809faf 3732 spin_unlock(&ifp->lock);
c5e33bdd
YH		 3733 }
3734 read_unlock_bh(&idev->lock);
3735}
3736
1da177e4
LT		 3737#ifdef CONFIG_PROC_FS
3738struct if6_iter_state {
3c40090a 3739 struct seq_net_private p;
1da177e4 3740 int bucket;
1d578303 3741 int offset;
1da177e4
LT		 3742};
3743
1d578303 3744static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos)
1da177e4
LT		 3745{
3746 struct inet6_ifaddr *ifa = NULL;
3747 struct if6_iter_state *state = seq->private;
1218854a 3748 struct net *net = seq_file_net(seq);
1d578303 3749 int p = 0;
1da177e4 3750
1d578303
MM		 3751 /* initial bucket if pos is 0 */
3752 if (pos == 0) {
3753 state->bucket = 0;
3754 state->offset = 0;
3755 }
3756
3757 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
b67bfe0d 3758 hlist_for_each_entry_rcu_bh(ifa, &inet6_addr_lst[state->bucket],
1d578303 3759 addr_lst) {
9f0d3c27
ED		 3760 if (!net_eq(dev_net(ifa->idev->dev), net))
3761 continue;
1d578303
MM		 3762 /* sync with offset */
3763 if (p < state->offset) {
3764 p++;
3765 continue;
3766 }
3767 state->offset++;
9f0d3c27 3768 return ifa;
1d578303
MM		 3769 }
3770
3771 /* prepare for next bucket */
3772 state->offset = 0;
3773 p = 0;
1da177e4 3774 }
c2e21293 3775 return NULL;
1da177e4
LT		 3776}
3777
c2e21293 3778static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
3779 struct inet6_ifaddr *ifa)
1da177e4
LT		 3780{
3781 struct if6_iter_state *state = seq->private;
1218854a 3782 struct net *net = seq_file_net(seq);
1da177e4 3783
b67bfe0d 3784 hlist_for_each_entry_continue_rcu_bh(ifa, addr_lst) {
9f0d3c27
ED		 3785 if (!net_eq(dev_net(ifa->idev->dev), net))
3786 continue;
1d578303 3787 state->offset++;
9f0d3c27 3788 return ifa;
1d578303 3789 }
3c40090a 3790
c2e21293 3791 while (++state->bucket < IN6_ADDR_HSIZE) {
1d578303 3792 state->offset = 0;
b67bfe0d 3793 hlist_for_each_entry_rcu_bh(ifa,
c2e21293 3794 &inet6_addr_lst[state->bucket], addr_lst) {
9f0d3c27
ED		 3795 if (!net_eq(dev_net(ifa->idev->dev), net))
3796 continue;
1d578303 3797 state->offset++;
9f0d3c27 3798 return ifa;
c2e21293 3799 }
1da177e4 3800 }
3c40090a 3801
c2e21293 3802 return NULL;
1da177e4
LT		 3803}
3804
1da177e4 3805static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
4f70ecca 3806 __acquires(rcu_bh)
1da177e4 3807{
5c578aed 3808 rcu_read_lock_bh();
1d578303 3809 return if6_get_first(seq, *pos);
1da177e4
LT		 3810}
3811
3812static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3813{
3814 struct inet6_ifaddr *ifa;
3815
3816 ifa = if6_get_next(seq, v);
3817 ++*pos;
3818 return ifa;
3819}
3820
3821static void if6_seq_stop(struct seq_file *seq, void *v)
4f70ecca 3822 __releases(rcu_bh)
1da177e4 3823{
5c578aed 3824 rcu_read_unlock_bh();
1da177e4
LT		 3825}
3826
3827static int if6_seq_show(struct seq_file *seq, void *v)
3828{
3829 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
971a351c 3830 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
b071195d 3831 &ifp->addr,
1da177e4
LT		 3832 ifp->idev->dev->ifindex,
3833 ifp->prefix_len,
3834 ifp->scope,
971a351c 3835 (u8) ifp->flags,
1da177e4
LT		 3836 ifp->idev->dev->name);
3837 return 0;
3838}
3839
56b3d975 3840static const struct seq_operations if6_seq_ops = {
1da177e4
LT		 3841 .start = if6_seq_start,
3842 .next = if6_seq_next,
3843 .show = if6_seq_show,
3844 .stop = if6_seq_stop,
3845};
3846
3847static int if6_seq_open(struct inode *inode, struct file *file)
3848{
3c40090a
DL		 3849 return seq_open_net(inode, file, &if6_seq_ops,
3850 sizeof(struct if6_iter_state));
1da177e4
LT		 3851}
3852
9a32144e 3853static const struct file_operations if6_fops = {
1da177e4
LT		 3854 .owner = THIS_MODULE,
3855 .open = if6_seq_open,
3856 .read = seq_read,
3857 .llseek = seq_lseek,
3c40090a 3858 .release = seq_release_net,
1da177e4
LT		 3859};
3860
2c8c1e72 3861static int __net_init if6_proc_net_init(struct net *net)
1da177e4 3862{
d4beaa66 3863 if (!proc_create("if_inet6", S_IRUGO, net->proc_net, &if6_fops))
1da177e4
LT		 3864 return -ENOMEM;
3865 return 0;
3866}
3867
2c8c1e72 3868static void __net_exit if6_proc_net_exit(struct net *net)
3c40090a 3869{
ece31ffd 3870 remove_proc_entry("if_inet6", net->proc_net);
3c40090a
DL		 3871}
3872
3873static struct pernet_operations if6_proc_net_ops = {
67ba4152
IM		 3874 .init = if6_proc_net_init,
3875 .exit = if6_proc_net_exit,
3c40090a
DL		 3876};
3877
3878int __init if6_proc_init(void)
3879{
3880 return register_pernet_subsys(&if6_proc_net_ops);
3881}
3882
1da177e4
LT		 3883void if6_proc_exit(void)
3884{
3c40090a 3885 unregister_pernet_subsys(&if6_proc_net_ops);
1da177e4
LT		 3886}
3887#endif /* CONFIG_PROC_FS */
3888
07a93626 3889#if IS_ENABLED(CONFIG_IPV6_MIP6)
3b9f9a1c 3890/* Check if address is a home address configured on any interface. */
b71d1d42 3891int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr)
3b9f9a1c
NT		 3892{
3893 int ret = 0;
c2e21293 3894 struct inet6_ifaddr *ifp = NULL;
ddbe5032 3895 unsigned int hash = inet6_addr_hash(addr);
c2e21293 3896
5c578aed 3897 rcu_read_lock_bh();
b67bfe0d 3898 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
878628fb 3899 if (!net_eq(dev_net(ifp->idev->dev), net))
389f6612 3900 continue;
caad295f 3901 if (ipv6_addr_equal(&ifp->addr, addr) &&
3b9f9a1c
NT		 3902 (ifp->flags & IFA_F_HOMEADDRESS)) {
3903 ret = 1;
3904 break;
3905 }
3906 }
5c578aed 3907 rcu_read_unlock_bh();
3b9f9a1c
NT		 3908 return ret;
3909}
3910#endif
3911
1da177e4
LT		 3912/*
3913 * Periodic address status verification
3914 */
3915
c15b1cca 3916static void addrconf_verify_rtnl(void)
1da177e4 3917{
b2db7564 3918 unsigned long now, next, next_sec, next_sched;
1da177e4 3919 struct inet6_ifaddr *ifp;
1da177e4
LT		 3920 int i;
3921
c15b1cca
HFS		 3922 ASSERT_RTNL();
3923
5c578aed 3924 rcu_read_lock_bh();
1da177e4 3925 now = jiffies;
b2db7564 3926 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
1da177e4 3927
c15b1cca 3928 cancel_delayed_work(&addr_chk_work);
1da177e4 3929
bcdd553f 3930 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
1da177e4 3931restart:
c15b1cca 3932 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[i], addr_lst) {
1da177e4 3933 unsigned long age;
1da177e4 3934
fad8da3e
YA		 3935 /* When setting preferred_lft to a value not zero or
3936 * infinity, while valid_lft is infinity
3937 * IFA_F_PERMANENT has a non-infinity life time.
3938 */
3939 if ((ifp->flags & IFA_F_PERMANENT) &&
3940 (ifp->prefered_lft == INFINITY_LIFE_TIME))
1da177e4
LT		 3941 continue;
3942
3943 spin_lock(&ifp->lock);
b2db7564
YH		 3944 /* We try to batch several events at once. */
3945 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
1da177e4 3946
8f27ebb9
YH		 3947 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
3948 age >= ifp->valid_lft) {
1da177e4
LT		 3949 spin_unlock(&ifp->lock);
3950 in6_ifa_hold(ifp);
1da177e4
LT		 3951 ipv6_del_addr(ifp);
3952 goto restart;
8f27ebb9
YH		 3953 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
3954 spin_unlock(&ifp->lock);
3955 continue;
1da177e4 3956 } else if (age >= ifp->prefered_lft) {
a1ed0526 3957 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
1da177e4
LT		 3958 int deprecate = 0;
3959
3960 if (!(ifp->flags&IFA_F_DEPRECATED)) {
3961 deprecate = 1;
3962 ifp->flags |= IFA_F_DEPRECATED;
3963 }
3964
fad8da3e
YA		 3965 if ((ifp->valid_lft != INFINITY_LIFE_TIME) &&
3966 (time_before(ifp->tstamp + ifp->valid_lft * HZ, next)))
1da177e4
LT		 3967 next = ifp->tstamp + ifp->valid_lft * HZ;
3968
3969 spin_unlock(&ifp->lock);
3970
3971 if (deprecate) {
3972 in6_ifa_hold(ifp);
1da177e4
LT		 3973
3974 ipv6_ifa_notify(0, ifp);
3975 in6_ifa_put(ifp);
3976 goto restart;
3977 }
1da177e4
LT		 3978 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
3979 !(ifp->flags&IFA_F_TENTATIVE)) {
88949cf4 3980 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
3981 ifp->idev->cnf.dad_transmits *
1f9248e5 3982 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME) / HZ;
88949cf4 3983
1da177e4
LT		 3984 if (age >= ifp->prefered_lft - regen_advance) {
3985 struct inet6_ifaddr *ifpub = ifp->ifpub;
3986 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3987 next = ifp->tstamp + ifp->prefered_lft * HZ;
3988 if (!ifp->regen_count && ifpub) {
3989 ifp->regen_count++;
3990 in6_ifa_hold(ifp);
3991 in6_ifa_hold(ifpub);
3992 spin_unlock(&ifp->lock);
5c578aed 3993
291d809b
HY		 3994 spin_lock(&ifpub->lock);
3995 ifpub->regen_count = 0;
3996 spin_unlock(&ifpub->lock);
1da177e4
LT		 3997 ipv6_create_tempaddr(ifpub, ifp);
3998 in6_ifa_put(ifpub);
3999 in6_ifa_put(ifp);
4000 goto restart;
4001 }
4002 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
4003 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
4004 spin_unlock(&ifp->lock);
1da177e4
LT		 4005 } else {
4006 /* ifp->prefered_lft <= ifp->valid_lft */
4007 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
4008 next = ifp->tstamp + ifp->prefered_lft * HZ;
4009 spin_unlock(&ifp->lock);
4010 }
4011 }
1da177e4
LT		 4012 }
4013
b2db7564
YH		 4014 next_sec = round_jiffies_up(next);
4015 next_sched = next;
4016
4017 /* If rounded timeout is accurate enough, accept it. */
4018 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
4019 next_sched = next_sec;
4020
4021 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
4022 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
4023 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
4024
ba3542e1 4025 ADBG(KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
4026 now, next, next_sec, next_sched);
c15b1cca 4027 mod_delayed_work(addrconf_wq, &addr_chk_work, next_sched - now);
5c578aed 4028 rcu_read_unlock_bh();
1da177e4
LT		 4029}
4030
c15b1cca
HFS		 4031static void addrconf_verify_work(struct work_struct *w)
4032{
4033 rtnl_lock();
4034 addrconf_verify_rtnl();
4035 rtnl_unlock();
4036}
4037
4038static void addrconf_verify(void)
4039{
4040 mod_delayed_work(addrconf_wq, &addr_chk_work, 0);
4041}
4042
caeaba79
ND		 4043static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local,
4044 struct in6_addr **peer_pfx)
461d8837
TG		 4045{
4046 struct in6_addr *pfx = NULL;
4047
caeaba79
ND		 4048 *peer_pfx = NULL;
4049
461d8837
TG		 4050 if (addr)
4051 pfx = nla_data(addr);
4052
4053 if (local) {
4054 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
caeaba79
ND		 4055 *peer_pfx = pfx;
4056 pfx = nla_data(local);
461d8837
TG		 4057 }
4058
4059 return pfx;
4060}
4061
ef7c79ed 4062static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
461d8837
TG		 4063 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
4064 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
4065 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
479840ff 4066 [IFA_FLAGS] = { .len = sizeof(u32) },
461d8837
TG		 4067};
4068
1da177e4 4069static int
661d2967 4070inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh)
1da177e4 4071{
3b1e0a65 4072 struct net *net = sock_net(skb->sk);
b933f716
TG		 4073 struct ifaddrmsg *ifm;
4074 struct nlattr *tb[IFA_MAX+1];
caeaba79 4075 struct in6_addr *pfx, *peer_pfx;
6046d5b4 4076 u32 ifa_flags;
b933f716 4077 int err;
1da177e4 4078
b933f716
TG		 4079 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
4080 if (err < 0)
4081 return err;
4082
4083 ifm = nlmsg_data(nlh);
caeaba79 4084 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
63159f29 4085 if (!pfx)
1da177e4
LT		 4086 return -EINVAL;
4087
6046d5b4
HK		 4088 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
4089
4090 /* We ignore other flags so far. */
4091 ifa_flags &= IFA_F_MANAGETEMPADDR;
4092
4093 return inet6_addr_del(net, ifm->ifa_index, ifa_flags, pfx,
4094 ifm->ifa_prefixlen);
1da177e4
LT		 4095}
4096
479840ff 4097static int inet6_addr_modify(struct inet6_ifaddr *ifp, u32 ifa_flags,
55ebaef1 4098 u32 prefered_lft, u32 valid_lft)
081bba5b 4099{
6f704992
YH		 4100 u32 flags;
4101 clock_t expires;
4bed72e4 4102 unsigned long timeout;
53bd6749 4103 bool was_managetempaddr;
5b84efec 4104 bool had_prefixroute;
46d48046 4105
c15b1cca
HFS		 4106 ASSERT_RTNL();
4107
081bba5b
NT		 4108 if (!valid_lft || (prefered_lft > valid_lft))
4109 return -EINVAL;
4110
53bd6749
JP		 4111 if (ifa_flags & IFA_F_MANAGETEMPADDR &&
4112 (ifp->flags & IFA_F_TEMPORARY || ifp->prefix_len != 64))
4113 return -EINVAL;
4114
4bed72e4
YH		 4115 timeout = addrconf_timeout_fixup(valid_lft, HZ);
4116 if (addrconf_finite_timeout(timeout)) {
4117 expires = jiffies_to_clock_t(timeout * HZ);
4118 valid_lft = timeout;
6f704992 4119 flags = RTF_EXPIRES;
4bed72e4
YH		 4120 } else {
4121 expires = 0;
4122 flags = 0;
4123 ifa_flags |= IFA_F_PERMANENT;
6f704992 4124 }
081bba5b 4125
4bed72e4
YH		 4126 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
4127 if (addrconf_finite_timeout(timeout)) {
4128 if (timeout == 0)
4129 ifa_flags |= IFA_F_DEPRECATED;
4130 prefered_lft = timeout;
4131 }
081bba5b
NT		 4132
4133 spin_lock_bh(&ifp->lock);
53bd6749 4134 was_managetempaddr = ifp->flags & IFA_F_MANAGETEMPADDR;
5b84efec
TH		 4135 had_prefixroute = ifp->flags & IFA_F_PERMANENT &&
4136 !(ifp->flags & IFA_F_NOPREFIXROUTE);
53bd6749 4137 ifp->flags &= ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD |
761aac73
TH		 4138 IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
4139 IFA_F_NOPREFIXROUTE);
53bd6749 4140 ifp->flags |= ifa_flags;
081bba5b
NT		 4141 ifp->tstamp = jiffies;
4142 ifp->valid_lft = valid_lft;
4143 ifp->prefered_lft = prefered_lft;
4144
4145 spin_unlock_bh(&ifp->lock);
4146 if (!(ifp->flags&IFA_F_TENTATIVE))
4147 ipv6_ifa_notify(0, ifp);
081bba5b 4148
761aac73
TH		 4149 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) {
4150 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
4151 expires, flags);
5b84efec
TH		 4152 } else if (had_prefixroute) {
4153 enum cleanup_prefix_rt_t action;
4154 unsigned long rt_expires;
4155
4156 write_lock_bh(&ifp->idev->lock);
4157 action = check_cleanup_prefix_route(ifp, &rt_expires);
4158 write_unlock_bh(&ifp->idev->lock);
4159
4160 if (action != CLEANUP_PREFIX_RT_NOP) {
4161 cleanup_prefix_route(ifp, rt_expires,
4162 action == CLEANUP_PREFIX_RT_DEL);
4163 }
761aac73 4164 }
53bd6749
JP		 4165
4166 if (was_managetempaddr || ifp->flags & IFA_F_MANAGETEMPADDR) {
4167 if (was_managetempaddr && !(ifp->flags & IFA_F_MANAGETEMPADDR))
4168 valid_lft = prefered_lft = 0;
4169 manage_tempaddrs(ifp->idev, ifp, valid_lft, prefered_lft,
4170 !was_managetempaddr, jiffies);
4171 }
4172
c15b1cca 4173 addrconf_verify_rtnl();
081bba5b
NT		 4174
4175 return 0;
4176}
4177
1da177e4 4178static int
661d2967 4179inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh)
1da177e4 4180{
3b1e0a65 4181 struct net *net = sock_net(skb->sk);
461d8837
TG		 4182 struct ifaddrmsg *ifm;
4183 struct nlattr *tb[IFA_MAX+1];
caeaba79 4184 struct in6_addr *pfx, *peer_pfx;
7198f8ce
TG		 4185 struct inet6_ifaddr *ifa;
4186 struct net_device *dev;
55ebaef1 4187 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
479840ff 4188 u32 ifa_flags;
461d8837 4189 int err;
1da177e4 4190
461d8837
TG		 4191 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
4192 if (err < 0)
4193 return err;
4194
4195 ifm = nlmsg_data(nlh);
caeaba79 4196 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
63159f29 4197 if (!pfx)
1da177e4
LT		 4198 return -EINVAL;
4199
461d8837 4200 if (tb[IFA_CACHEINFO]) {
0778769d 4201 struct ifa_cacheinfo *ci;
461d8837
TG		 4202
4203 ci = nla_data(tb[IFA_CACHEINFO]);
0778769d 4204 valid_lft = ci->ifa_valid;
461d8837
TG		 4205 preferred_lft = ci->ifa_prefered;
4206 } else {
4207 preferred_lft = INFINITY_LIFE_TIME;
4208 valid_lft = INFINITY_LIFE_TIME;
0778769d
NT		 4209 }
4210
af284937 4211 dev = __dev_get_by_index(net, ifm->ifa_index);
63159f29 4212 if (!dev)
7198f8ce
TG		 4213 return -ENODEV;
4214
479840ff
JP		 4215 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
4216
55ebaef1 4217 /* We ignore other flags so far. */
761aac73 4218 ifa_flags &= IFA_F_NODAD | IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
93a714d6 4219 IFA_F_NOPREFIXROUTE | IFA_F_MCAUTOJOIN;
55ebaef1 4220
1cab3da6 4221 ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
63159f29 4222 if (!ifa) {
7198f8ce
TG		 4223 /*
4224 * It would be best to check for !NLM_F_CREATE here but
db9c7c39 4225 * userspace already relies on not having to provide this.
7198f8ce 4226 */
caeaba79 4227 return inet6_addr_add(net, ifm->ifa_index, pfx, peer_pfx,
af284937
DL		 4228 ifm->ifa_prefixlen, ifa_flags,
4229 preferred_lft, valid_lft);
081bba5b
NT		 4230 }
4231
7198f8ce
TG		 4232 if (nlh->nlmsg_flags & NLM_F_EXCL ||
4233 !(nlh->nlmsg_flags & NLM_F_REPLACE))
4234 err = -EEXIST;
4235 else
55ebaef1 4236 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
7198f8ce
TG		 4237
4238 in6_ifa_put(ifa);
4239
4240 return err;
1da177e4
LT		 4241}
4242
479840ff 4243static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u32 flags,
101bb229
TG		 4244 u8 scope, int ifindex)
4245{
4246 struct ifaddrmsg *ifm;
4247
4248 ifm = nlmsg_data(nlh);
4249 ifm->ifa_family = AF_INET6;
4250 ifm->ifa_prefixlen = prefixlen;
4251 ifm->ifa_flags = flags;
4252 ifm->ifa_scope = scope;
4253 ifm->ifa_index = ifindex;
4254}
4255
85486af0
TG		 4256static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
4257 unsigned long tstamp, u32 preferred, u32 valid)
4258{
4259 struct ifa_cacheinfo ci;
4260
18a31e1e
TG		 4261 ci.cstamp = cstamp_delta(cstamp);
4262 ci.tstamp = cstamp_delta(tstamp);
85486af0
TG		 4263 ci.ifa_prefered = preferred;
4264 ci.ifa_valid = valid;
4265
4266 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
4267}
4268
101bb229
TG		 4269static inline int rt_scope(int ifa_scope)
4270{
4271 if (ifa_scope & IFA_HOST)
4272 return RT_SCOPE_HOST;
4273 else if (ifa_scope & IFA_LINK)
4274 return RT_SCOPE_LINK;
4275 else if (ifa_scope & IFA_SITE)
4276 return RT_SCOPE_SITE;
4277 else
4278 return RT_SCOPE_UNIVERSE;
4279}
4280
0ab6803b
TG		 4281static inline int inet6_ifaddr_msgsize(void)
4282{
339bf98f 4283 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
caeaba79 4284 + nla_total_size(16) /* IFA_LOCAL */
339bf98f 4285 + nla_total_size(16) /* IFA_ADDRESS */
479840ff
JP		 4286 + nla_total_size(sizeof(struct ifa_cacheinfo))
4287 + nla_total_size(4) /* IFA_FLAGS */;
0ab6803b 4288}
c5396a31 4289
1da177e4 4290static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
15e47304 4291 u32 portid, u32 seq, int event, unsigned int flags)
1da177e4 4292{
1da177e4 4293 struct nlmsghdr *nlh;
85486af0 4294 u32 preferred, valid;
1da177e4 4295
15e47304 4296 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
63159f29 4297 if (!nlh)
26932566 4298 return -EMSGSIZE;
0ab6803b 4299
101bb229
TG		 4300 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
4301 ifa->idev->dev->ifindex);
4302
fad8da3e
YA		 4303 if (!((ifa->flags&IFA_F_PERMANENT) &&
4304 (ifa->prefered_lft == INFINITY_LIFE_TIME))) {
85486af0
TG		 4305 preferred = ifa->prefered_lft;
4306 valid = ifa->valid_lft;
4307 if (preferred != INFINITY_LIFE_TIME) {
1da177e4 4308 long tval = (jiffies - ifa->tstamp)/HZ;
a1faa698
JR		 4309 if (preferred > tval)
4310 preferred -= tval;
4311 else
4312 preferred = 0;
f56619fc
BH		 4313 if (valid != INFINITY_LIFE_TIME) {
4314 if (valid > tval)
4315 valid -= tval;
4316 else
4317 valid = 0;
4318 }
1da177e4
LT		 4319 }
4320 } else {
85486af0
TG		 4321 preferred = INFINITY_LIFE_TIME;
4322 valid = INFINITY_LIFE_TIME;
4323 }
4324
7996c799 4325 if (!ipv6_addr_any(&ifa->peer_addr)) {
930345ea
JB		 4326 if (nla_put_in6_addr(skb, IFA_LOCAL, &ifa->addr) < 0 ||
4327 nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->peer_addr) < 0)
caeaba79
ND		 4328 goto error;
4329 } else
930345ea 4330 if (nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->addr) < 0)
caeaba79
ND		 4331 goto error;
4332
4333 if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0)
4334 goto error;
1da177e4 4335
479840ff
JP		 4336 if (nla_put_u32(skb, IFA_FLAGS, ifa->flags) < 0)
4337 goto error;
4338
053c095a
JB		 4339 nlmsg_end(skb, nlh);
4340 return 0;
caeaba79
ND		 4341
4342error:
4343 nlmsg_cancel(skb, nlh);
4344 return -EMSGSIZE;
1da177e4
LT		 4345}
4346
4347static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
15e47304 4348 u32 portid, u32 seq, int event, u16 flags)
1da177e4 4349{
1da177e4 4350 struct nlmsghdr *nlh;
101bb229
TG		 4351 u8 scope = RT_SCOPE_UNIVERSE;
4352 int ifindex = ifmca->idev->dev->ifindex;
4353
4354 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
4355 scope = RT_SCOPE_SITE;
1da177e4 4356
15e47304 4357 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
63159f29 4358 if (!nlh)
26932566 4359 return -EMSGSIZE;
85486af0 4360
0ab6803b 4361 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
930345ea 4362 if (nla_put_in6_addr(skb, IFA_MULTICAST, &ifmca->mca_addr) < 0 ||
0ab6803b 4363 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
26932566
PM		 4364 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
4365 nlmsg_cancel(skb, nlh);
4366 return -EMSGSIZE;
4367 }
85486af0 4368
053c095a
JB		 4369 nlmsg_end(skb, nlh);
4370 return 0;
1da177e4
LT		 4371}
4372
4373static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
15e47304 4374 u32 portid, u32 seq, int event, unsigned int flags)
1da177e4 4375{
1da177e4 4376 struct nlmsghdr *nlh;
101bb229
TG		 4377 u8 scope = RT_SCOPE_UNIVERSE;
4378 int ifindex = ifaca->aca_idev->dev->ifindex;
4379
4380 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
4381 scope = RT_SCOPE_SITE;
1da177e4 4382
15e47304 4383 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
63159f29 4384 if (!nlh)
26932566 4385 return -EMSGSIZE;
85486af0 4386
0ab6803b 4387 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
930345ea 4388 if (nla_put_in6_addr(skb, IFA_ANYCAST, &ifaca->aca_addr) < 0 ||
0ab6803b 4389 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
26932566
PM		 4390 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
4391 nlmsg_cancel(skb, nlh);
4392 return -EMSGSIZE;
4393 }
1da177e4 4394
053c095a
JB		 4395 nlmsg_end(skb, nlh);
4396 return 0;
1da177e4
LT		 4397}
4398
e21e8467 4399enum addr_type_t {
1da177e4
LT		 4400 UNICAST_ADDR,
4401 MULTICAST_ADDR,
4402 ANYCAST_ADDR,
4403};
4404
234b27c3
ED		 4405/* called with rcu_read_lock() */
4406static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
4407 struct netlink_callback *cb, enum addr_type_t type,
4408 int s_ip_idx, int *p_ip_idx)
4409{
234b27c3
ED		 4410 struct ifmcaddr6 *ifmca;
4411 struct ifacaddr6 *ifaca;
4412 int err = 1;
4413 int ip_idx = *p_ip_idx;
4414
4415 read_lock_bh(&idev->lock);
4416 switch (type) {
502a2ffd 4417 case UNICAST_ADDR: {
4418 struct inet6_ifaddr *ifa;
4419
234b27c3 4420 /* unicast address incl. temp addr */
502a2ffd 4421 list_for_each_entry(ifa, &idev->addr_list, if_list) {
4422 if (++ip_idx < s_ip_idx)
234b27c3
ED		 4423 continue;
4424 err = inet6_fill_ifaddr(skb, ifa,
15e47304 4425 NETLINK_CB(cb->skb).portid,
234b27c3
ED		 4426 cb->nlh->nlmsg_seq,
4427 RTM_NEWADDR,
4428 NLM_F_MULTI);
053c095a 4429 if (err < 0)
234b27c3 4430 break;
63998ac2 4431 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
234b27c3
ED		 4432 }
4433 break;
502a2ffd 4434 }
234b27c3
ED		 4435 case MULTICAST_ADDR:
4436 /* multicast address */
4437 for (ifmca = idev->mc_list; ifmca;
4438 ifmca = ifmca->next, ip_idx++) {
4439 if (ip_idx < s_ip_idx)
4440 continue;
4441 err = inet6_fill_ifmcaddr(skb, ifmca,
15e47304 4442 NETLINK_CB(cb->skb).portid,
234b27c3
ED		 4443 cb->nlh->nlmsg_seq,
4444 RTM_GETMULTICAST,
4445 NLM_F_MULTI);
053c095a 4446 if (err < 0)
234b27c3
ED		 4447 break;
4448 }
4449 break;
4450 case ANYCAST_ADDR:
4451 /* anycast address */
4452 for (ifaca = idev->ac_list; ifaca;
4453 ifaca = ifaca->aca_next, ip_idx++) {
4454 if (ip_idx < s_ip_idx)
4455 continue;
4456 err = inet6_fill_ifacaddr(skb, ifaca,
15e47304 4457 NETLINK_CB(cb->skb).portid,
234b27c3
ED		 4458 cb->nlh->nlmsg_seq,
4459 RTM_GETANYCAST,
4460 NLM_F_MULTI);
053c095a 4461 if (err < 0)
234b27c3
ED		 4462 break;
4463 }
4464 break;
4465 default:
4466 break;
4467 }
4468 read_unlock_bh(&idev->lock);
4469 *p_ip_idx = ip_idx;
4470 return err;
4471}
4472
1da177e4
LT		 4473static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
4474 enum addr_type_t type)
4475{
234b27c3
ED		 4476 struct net *net = sock_net(skb->sk);
4477 int h, s_h;
1da177e4
LT		 4478 int idx, ip_idx;
4479 int s_idx, s_ip_idx;
1da177e4 4480 struct net_device *dev;
234b27c3
ED		 4481 struct inet6_dev *idev;
4482 struct hlist_head *head;
1ab1457c 4483
234b27c3
ED		 4484 s_h = cb->args[0];
4485 s_idx = idx = cb->args[1];
4486 s_ip_idx = ip_idx = cb->args[2];
5d5619b4 4487
234b27c3 4488 rcu_read_lock();
63998ac2 4489 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ net->dev_base_seq;
234b27c3
ED		 4490 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4491 idx = 0;
4492 head = &net->dev_index_head[h];
b67bfe0d 4493 hlist_for_each_entry_rcu(dev, head, index_hlist) {
234b27c3
ED		 4494 if (idx < s_idx)
4495 goto cont;
4b97efdf 4496 if (h > s_h || idx > s_idx)
234b27c3
ED		 4497 s_ip_idx = 0;
4498 ip_idx = 0;
e21e8467
SH		 4499 idev = __in6_dev_get(dev);
4500 if (!idev)
234b27c3
ED		 4501 goto cont;
4502
4503 if (in6_dump_addrs(idev, skb, cb, type,
7b46a644 4504 s_ip_idx, &ip_idx) < 0)
234b27c3 4505 goto done;
7562f876 4506cont:
234b27c3
ED		 4507 idx++;
4508 }
1da177e4 4509 }
234b27c3
ED		 4510done:
4511 rcu_read_unlock();
4512 cb->args[0] = h;
4513 cb->args[1] = idx;
4514 cb->args[2] = ip_idx;
4515
1da177e4
LT		 4516 return skb->len;
4517}
4518
4519static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
4520{
4521 enum addr_type_t type = UNICAST_ADDR;
b854272b 4522
1da177e4
LT		 4523 return inet6_dump_addr(skb, cb, type);
4524}
4525
4526static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
4527{
4528 enum addr_type_t type = MULTICAST_ADDR;
b854272b 4529
1da177e4
LT		 4530 return inet6_dump_addr(skb, cb, type);
4531}
4532
4533
4534static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
4535{
4536 enum addr_type_t type = ANYCAST_ADDR;
b854272b 4537
1da177e4
LT		 4538 return inet6_dump_addr(skb, cb, type);
4539}
4540
661d2967 4541static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh)
6c223828 4542{
3b1e0a65 4543 struct net *net = sock_net(in_skb->sk);
1b29fc2c
TG		 4544 struct ifaddrmsg *ifm;
4545 struct nlattr *tb[IFA_MAX+1];
caeaba79 4546 struct in6_addr *addr = NULL, *peer;
6c223828
NT		 4547 struct net_device *dev = NULL;
4548 struct inet6_ifaddr *ifa;
4549 struct sk_buff *skb;
6c223828
NT		 4550 int err;
4551
1b29fc2c
TG		 4552 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
4553 if (err < 0)
4554 goto errout;
4555
caeaba79 4556 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer);
63159f29 4557 if (!addr) {
1b29fc2c
TG		 4558 err = -EINVAL;
4559 goto errout;
6c223828 4560 }
6c223828 4561
1b29fc2c 4562 ifm = nlmsg_data(nlh);
6c223828 4563 if (ifm->ifa_index)
6fda7350 4564 dev = __dev_get_by_index(net, ifm->ifa_index);
6c223828 4565
e21e8467
SH		 4566 ifa = ipv6_get_ifaddr(net, addr, dev, 1);
4567 if (!ifa) {
1b29fc2c
TG		 4568 err = -EADDRNOTAVAIL;
4569 goto errout;
4570 }
6c223828 4571
e21e8467
SH		 4572 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
4573 if (!skb) {
6c223828 4574 err = -ENOBUFS;
1b29fc2c 4575 goto errout_ifa;
6c223828
NT		 4576 }
4577
15e47304 4578 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).portid,
6c223828 4579 nlh->nlmsg_seq, RTM_NEWADDR, 0);
26932566
PM		 4580 if (err < 0) {
4581 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4582 WARN_ON(err == -EMSGSIZE);
4583 kfree_skb(skb);
4584 goto errout_ifa;
4585 }
15e47304 4586 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
1b29fc2c 4587errout_ifa:
6c223828 4588 in6_ifa_put(ifa);
1b29fc2c 4589errout:
6c223828 4590 return err;
6c223828
NT		 4591}
4592
1da177e4
LT		 4593static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
4594{
4595 struct sk_buff *skb;
c346dca1 4596 struct net *net = dev_net(ifa->idev->dev);
5d620266 4597 int err = -ENOBUFS;
1da177e4 4598
0ab6803b 4599 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
63159f29 4600 if (!skb)
5d620266
TG		 4601 goto errout;
4602
4603 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
26932566
PM		 4604 if (err < 0) {
4605 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4606 WARN_ON(err == -EMSGSIZE);
4607 kfree_skb(skb);
4608 goto errout;
4609 }
1ce85fe4
PNA		 4610 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
4611 return;
5d620266
TG		 4612errout:
4613 if (err < 0)
6fda7350 4614 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
1da177e4
LT		 4615}
4616
b6f99a21 4617static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
1da177e4
LT		 4618 __s32 *array, int bytes)
4619{
04561c1f
TG		 4620 BUG_ON(bytes < (DEVCONF_MAX * 4));
4621
1da177e4
LT		 4622 memset(array, 0, bytes);
4623 array[DEVCONF_FORWARDING] = cnf->forwarding;
4624 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
4625 array[DEVCONF_MTU6] = cnf->mtu6;
4626 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
4627 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
4628 array[DEVCONF_AUTOCONF] = cnf->autoconf;
4629 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
4630 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
93908d19
TG		 4631 array[DEVCONF_RTR_SOLICIT_INTERVAL] =
4632 jiffies_to_msecs(cnf->rtr_solicit_interval);
4633 array[DEVCONF_RTR_SOLICIT_DELAY] =
4634 jiffies_to_msecs(cnf->rtr_solicit_delay);
1da177e4 4635 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
fc4eba58
HFS		 4636 array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] =
4637 jiffies_to_msecs(cnf->mldv1_unsolicited_report_interval);
4638 array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] =
4639 jiffies_to_msecs(cnf->mldv2_unsolicited_report_interval);
1da177e4
LT		 4640 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
4641 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
4642 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
4643 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
4644 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
1da177e4 4645 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
65f5c7c1 4646 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
8013d1d7 4647 array[DEVCONF_ACCEPT_RA_MIN_HOP_LIMIT] = cnf->accept_ra_min_hop_limit;
c4fd30eb 4648 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
930d6ff2
YH		 4649#ifdef CONFIG_IPV6_ROUTER_PREF
4650 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
93908d19
TG		 4651 array[DEVCONF_RTR_PROBE_INTERVAL] =
4652 jiffies_to_msecs(cnf->rtr_probe_interval);
fa03ef38 4653#ifdef CONFIG_IPV6_ROUTE_INFO
09c884d4
YH		 4654 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
4655#endif
930d6ff2 4656#endif
fbea49e1 4657 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
0bcbc926 4658 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
95c385b4
NH		 4659#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4660 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
7fd2561e 4661 array[DEVCONF_USE_OPTIMISTIC] = cnf->use_optimistic;
95c385b4 4662#endif
7bc570c8
YH		 4663#ifdef CONFIG_IPV6_MROUTE
4664 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
4665#endif
778d80be 4666 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
1b34be74 4667 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
c3faca05 4668 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
5cb04436 4669 array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify;
b800c3b9 4670 array[DEVCONF_SUPPRESS_FRAG_NDISC] = cnf->suppress_frag_ndisc;
d9333196 4671 array[DEVCONF_ACCEPT_RA_FROM_LOCAL] = cnf->accept_ra_from_local;
c2943f14 4672 array[DEVCONF_ACCEPT_RA_MTU] = cnf->accept_ra_mtu;
35103d11 4673 array[DEVCONF_IGNORE_ROUTES_WITH_LINKDOWN] = cnf->ignore_routes_with_linkdown;
3d1bec99 4674 /* we omit DEVCONF_STABLE_SECRET for now */
3985e8a3 4675 array[DEVCONF_USE_OIF_ADDRS_ONLY] = cnf->use_oif_addrs_only;
1da177e4
LT		 4676}
4677
b382b191
TG		 4678static inline size_t inet6_ifla6_size(void)
4679{
4680 return nla_total_size(4) /* IFLA_INET6_FLAGS */
4681 + nla_total_size(sizeof(struct ifla_cacheinfo))
4682 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
4683 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
f53adae4
DB		 4684 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
4685 + nla_total_size(sizeof(struct in6_addr)); /* IFLA_INET6_TOKEN */
b382b191
TG		 4686}
4687
339bf98f
TG		 4688static inline size_t inet6_if_nlmsg_size(void)
4689{
4690 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
4691 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
4692 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
4693 + nla_total_size(4) /* IFLA_MTU */
4694 + nla_total_size(4) /* IFLA_LINK */
0344338b 4695 + nla_total_size(1) /* IFLA_OPERSTATE */
b382b191 4696 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */
339bf98f 4697}
c5396a31 4698
be281e55 4699static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib,
7d720c3e 4700 int items, int bytes)
7f7d9a6b
HX		 4701{
4702 int i;
4703 int pad = bytes - sizeof(u64) * items;
4704 BUG_ON(pad < 0);
4705
4706 /* Use put_unaligned() because stats may not be aligned for u64. */
4707 put_unaligned(items, &stats[0]);
4708 for (i = 1; i < items; i++)
be281e55 4709 put_unaligned(atomic_long_read(&mib[i]), &stats[i]);
7f7d9a6b
HX		 4710
4711 memset(&stats[items], 0, pad);
4712}
4713
698365fa 4714static inline void __snmp6_fill_stats64(u64 *stats, void __percpu *mib,
a3a77372 4715 int bytes, size_t syncpoff)
4ce3c183 4716{
a3a77372
R		 4717 int i, c;
4718 u64 buff[IPSTATS_MIB_MAX];
4719 int pad = bytes - sizeof(u64) * IPSTATS_MIB_MAX;
4720
4ce3c183
ED		 4721 BUG_ON(pad < 0);
4722
a3a77372
R		 4723 memset(buff, 0, sizeof(buff));
4724 buff[0] = IPSTATS_MIB_MAX;
4ce3c183 4725
a3a77372
R		 4726 for_each_possible_cpu(c) {
4727 for (i = 1; i < IPSTATS_MIB_MAX; i++)
4728 buff[i] += snmp_get_cpu_field64(mib, c, i, syncpoff);
4729 }
4730
4731 memcpy(stats, buff, IPSTATS_MIB_MAX * sizeof(u64));
4732 memset(&stats[IPSTATS_MIB_MAX], 0, pad);
4ce3c183
ED		 4733}
4734
7f7d9a6b
HX		 4735static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
4736 int bytes)
4737{
e21e8467 4738 switch (attrtype) {
7f7d9a6b 4739 case IFLA_INET6_STATS:
a3a77372
R		 4740 __snmp6_fill_stats64(stats, idev->stats.ipv6, bytes,
4741 offsetof(struct ipstats_mib, syncp));
7f7d9a6b
HX		 4742 break;
4743 case IFLA_INET6_ICMP6STATS:
be281e55 4744 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, ICMP6_MIB_MAX, bytes);
7f7d9a6b
HX		 4745 break;
4746 }
4747}
4748
d5566fd7
SV		 4749static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev,
4750 u32 ext_filter_mask)
b382b191
TG		 4751{
4752 struct nlattr *nla;
4753 struct ifla_cacheinfo ci;
4754
c78679e8
DM		 4755 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags))
4756 goto nla_put_failure;
b382b191 4757 ci.max_reasm_len = IPV6_MAXPLEN;
24912420
DM		 4758 ci.tstamp = cstamp_delta(idev->tstamp);
4759 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time);
1f9248e5 4760 ci.retrans_time = jiffies_to_msecs(NEIGH_VAR(idev->nd_parms, RETRANS_TIME));
c78679e8
DM		 4761 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci))
4762 goto nla_put_failure;
b382b191 4763 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
63159f29 4764 if (!nla)
b382b191
TG		 4765 goto nla_put_failure;
4766 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
4767
4768 /* XXX - MC not implemented */
4769
d5566fd7
SV		 4770 if (ext_filter_mask & RTEXT_FILTER_SKIP_STATS)
4771 return 0;
4772
b382b191 4773 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
63159f29 4774 if (!nla)
b382b191
TG		 4775 goto nla_put_failure;
4776 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
4777
4778 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
63159f29 4779 if (!nla)
b382b191
TG		 4780 goto nla_put_failure;
4781 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
4782
f53adae4 4783 nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr));
63159f29 4784 if (!nla)
f53adae4 4785 goto nla_put_failure;
bc91b0f0
JP		 4786
4787 if (nla_put_u8(skb, IFLA_INET6_ADDR_GEN_MODE, idev->addr_gen_mode))
4788 goto nla_put_failure;
4789
f53adae4
DB		 4790 read_lock_bh(&idev->lock);
4791 memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla));
4792 read_unlock_bh(&idev->lock);
4793
b382b191
TG		 4794 return 0;
4795
4796nla_put_failure:
4797 return -EMSGSIZE;
4798}
4799
b1974ed0
AR		 4800static size_t inet6_get_link_af_size(const struct net_device *dev,
4801 u32 ext_filter_mask)
b382b191
TG		 4802{
4803 if (!__in6_dev_get(dev))
4804 return 0;
4805
4806 return inet6_ifla6_size();
4807}
4808
d5566fd7
SV		 4809static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev,
4810 u32 ext_filter_mask)
b382b191
TG		 4811{
4812 struct inet6_dev *idev = __in6_dev_get(dev);
4813
4814 if (!idev)
4815 return -ENODATA;
4816
d5566fd7 4817 if (inet6_fill_ifla6_attrs(skb, idev, ext_filter_mask) < 0)
b382b191
TG		 4818 return -EMSGSIZE;
4819
4820 return 0;
4821}
4822
f53adae4
DB		 4823static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token)
4824{
f53adae4
DB		 4825 struct inet6_ifaddr *ifp;
4826 struct net_device *dev = idev->dev;
fc403832 4827 bool update_rs = false;
dc848292 4828 struct in6_addr ll_addr;
f53adae4 4829
c15b1cca
HFS		 4830 ASSERT_RTNL();
4831
63159f29 4832 if (!token)
f53adae4
DB		 4833 return -EINVAL;
4834 if (ipv6_addr_any(token))
4835 return -EINVAL;
4836 if (dev->flags & (IFF_LOOPBACK | IFF_NOARP))
4837 return -EINVAL;
f53adae4
DB		 4838 if (!ipv6_accept_ra(idev))
4839 return -EINVAL;
4840 if (idev->cnf.rtr_solicits <= 0)
4841 return -EINVAL;
4842
4843 write_lock_bh(&idev->lock);
4844
4845 BUILD_BUG_ON(sizeof(token->s6_addr) != 16);
4846 memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8);
4847
4848 write_unlock_bh(&idev->lock);
4849
dc848292
HFS		 4850 if (!idev->dead && (idev->if_flags & IF_READY) &&
4851 !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE |
4852 IFA_F_OPTIMISTIC)) {
fc403832
DB		 4853
4854 /* If we're not ready, then normal ifup will take care
4855 * of this. Otherwise, we need to request our rs here.
4856 */
4857 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters);
4858 update_rs = true;
4859 }
f53adae4
DB		 4860
4861 write_lock_bh(&idev->lock);
fc403832 4862
77ecaace 4863 if (update_rs) {
fc403832 4864 idev->if_flags |= IF_RS_SENT;
77ecaace
HFS		 4865 idev->rs_probes = 1;
4866 addrconf_mod_rs_timer(idev, idev->cnf.rtr_solicit_interval);
4867 }
f53adae4
DB		 4868
4869 /* Well, that's kinda nasty ... */
4870 list_for_each_entry(ifp, &idev->addr_list, if_list) {
4871 spin_lock(&ifp->lock);
617fe29d 4872 if (ifp->tokenized) {
f53adae4
DB		 4873 ifp->valid_lft = 0;
4874 ifp->prefered_lft = 0;
4875 }
4876 spin_unlock(&ifp->lock);
4877 }
4878
4879 write_unlock_bh(&idev->lock);
b2ed64a9 4880 inet6_ifinfo_notify(RTM_NEWLINK, idev);
c15b1cca 4881 addrconf_verify_rtnl();
f53adae4
DB		 4882 return 0;
4883}
4884
11b1f828
DB		 4885static const struct nla_policy inet6_af_policy[IFLA_INET6_MAX + 1] = {
4886 [IFLA_INET6_ADDR_GEN_MODE] = { .type = NLA_U8 },
4887 [IFLA_INET6_TOKEN] = { .len = sizeof(struct in6_addr) },
4888};
4889
4890static int inet6_validate_link_af(const struct net_device *dev,
4891 const struct nlattr *nla)
4892{
4893 struct nlattr *tb[IFLA_INET6_MAX + 1];
4894
4895 if (dev && !__in6_dev_get(dev))
4896 return -EAFNOSUPPORT;
4897
4898 return nla_parse_nested(tb, IFLA_INET6_MAX, nla, inet6_af_policy);
4899}
4900
f53adae4
DB		 4901static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla)
4902{
4903 int err = -EINVAL;
4904 struct inet6_dev *idev = __in6_dev_get(dev);
4905 struct nlattr *tb[IFLA_INET6_MAX + 1];
4906
4907 if (!idev)
4908 return -EAFNOSUPPORT;
4909
4910 if (nla_parse_nested(tb, IFLA_INET6_MAX, nla, NULL) < 0)
4911 BUG();
4912
bc91b0f0 4913 if (tb[IFLA_INET6_TOKEN]) {
f53adae4 4914 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN]));
bc91b0f0
JP		 4915 if (err)
4916 return err;
4917 }
4918
4919 if (tb[IFLA_INET6_ADDR_GEN_MODE]) {
4920 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]);
4921
4922 if (mode != IN6_ADDR_GEN_MODE_EUI64 &&
622c81d5
HFS		 4923 mode != IN6_ADDR_GEN_MODE_NONE &&
4924 mode != IN6_ADDR_GEN_MODE_STABLE_PRIVACY)
4925 return -EINVAL;
4926
4927 if (mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
4928 !idev->cnf.stable_secret.initialized &&
4929 !dev_net(dev)->ipv6.devconf_dflt->stable_secret.initialized)
bc91b0f0 4930 return -EINVAL;
622c81d5 4931
bc91b0f0
JP		 4932 idev->addr_gen_mode = mode;
4933 err = 0;
4934 }
f53adae4
DB		 4935
4936 return err;
4937}
4938
1ab1457c 4939static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
15e47304 4940 u32 portid, u32 seq, int event, unsigned int flags)
1da177e4 4941{
04561c1f 4942 struct net_device *dev = idev->dev;
04561c1f
TG		 4943 struct ifinfomsg *hdr;
4944 struct nlmsghdr *nlh;
4945 void *protoinfo;
04561c1f 4946
15e47304 4947 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags);
63159f29 4948 if (!nlh)
26932566 4949 return -EMSGSIZE;
04561c1f
TG		 4950
4951 hdr = nlmsg_data(nlh);
4952 hdr->ifi_family = AF_INET6;
4953 hdr->__ifi_pad = 0;
4954 hdr->ifi_type = dev->type;
4955 hdr->ifi_index = dev->ifindex;
4956 hdr->ifi_flags = dev_get_flags(dev);
4957 hdr->ifi_change = 0;
4958
c78679e8
DM		 4959 if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
4960 (dev->addr_len &&
4961 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
4962 nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
a54acb3a 4963 (dev->ifindex != dev_get_iflink(dev) &&
0344338b
AG		 4964 nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))) ||
4965 nla_put_u8(skb, IFLA_OPERSTATE,
4966 netif_running(dev) ? dev->operstate : IF_OPER_DOWN))
c78679e8 4967 goto nla_put_failure;
04561c1f 4968 protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
63159f29 4969 if (!protoinfo)
04561c1f 4970 goto nla_put_failure;
1da177e4 4971
d5566fd7 4972 if (inet6_fill_ifla6_attrs(skb, idev, 0) < 0)
bf99f1bd 4973 goto nla_put_failure;
1da177e4 4974
04561c1f 4975 nla_nest_end(skb, protoinfo);
053c095a
JB		 4976 nlmsg_end(skb, nlh);
4977 return 0;
1da177e4 4978
04561c1f 4979nla_put_failure:
26932566
PM		 4980 nlmsg_cancel(skb, nlh);
4981 return -EMSGSIZE;
1da177e4
LT		 4982}
4983
4984static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
4985{
3b1e0a65 4986 struct net *net = sock_net(skb->sk);
84d2697d 4987 int h, s_h;
434a8a58 4988 int idx = 0, s_idx;
1da177e4
LT		 4989 struct net_device *dev;
4990 struct inet6_dev *idev;
84d2697d 4991 struct hlist_head *head;
1da177e4 4992
84d2697d
ED		 4993 s_h = cb->args[0];
4994 s_idx = cb->args[1];
4995
4996 rcu_read_lock();
4997 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4998 idx = 0;
4999 head = &net->dev_index_head[h];
b67bfe0d 5000 hlist_for_each_entry_rcu(dev, head, index_hlist) {
84d2697d
ED		 5001 if (idx < s_idx)
5002 goto cont;
5003 idev = __in6_dev_get(dev);
5004 if (!idev)
5005 goto cont;
5006 if (inet6_fill_ifinfo(skb, idev,
15e47304 5007 NETLINK_CB(cb->skb).portid,
84d2697d 5008 cb->nlh->nlmsg_seq,
053c095a 5009 RTM_NEWLINK, NLM_F_MULTI) < 0)
84d2697d 5010 goto out;
7562f876 5011cont:
84d2697d
ED		 5012 idx++;
5013 }
1da177e4 5014 }
84d2697d
ED		 5015out:
5016 rcu_read_unlock();
5017 cb->args[1] = idx;
5018 cb->args[0] = h;
1da177e4
LT		 5019
5020 return skb->len;
5021}
5022
5023void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
5024{
5025 struct sk_buff *skb;
c346dca1 5026 struct net *net = dev_net(idev->dev);
8d7a76c9 5027 int err = -ENOBUFS;
1ab1457c 5028
339bf98f 5029 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
63159f29 5030 if (!skb)
8d7a76c9
TG		 5031 goto errout;
5032
5033 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
26932566
PM		 5034 if (err < 0) {
5035 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
5036 WARN_ON(err == -EMSGSIZE);
5037 kfree_skb(skb);
5038 goto errout;
5039 }
5f75a104 5040 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC);
1ce85fe4 5041 return;
8d7a76c9
TG		 5042errout:
5043 if (err < 0)
5f75a104 5044 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err);
1da177e4
LT		 5045}
5046
339bf98f
TG		 5047static inline size_t inet6_prefix_nlmsg_size(void)
5048{
5049 return NLMSG_ALIGN(sizeof(struct prefixmsg))
5050 + nla_total_size(sizeof(struct in6_addr))
5051 + nla_total_size(sizeof(struct prefix_cacheinfo));
5052}
c5396a31 5053
1da177e4 5054static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
15e47304 5055 struct prefix_info *pinfo, u32 portid, u32 seq,
6051e2f4 5056 int event, unsigned int flags)
1da177e4 5057{
6051e2f4
TG		 5058 struct prefixmsg *pmsg;
5059 struct nlmsghdr *nlh;
1da177e4
LT		 5060 struct prefix_cacheinfo ci;
5061
15e47304 5062 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags);
63159f29 5063 if (!nlh)
26932566 5064 return -EMSGSIZE;
6051e2f4
TG		 5065
5066 pmsg = nlmsg_data(nlh);
1da177e4 5067 pmsg->prefix_family = AF_INET6;
8a47077a
PM		 5068 pmsg->prefix_pad1 = 0;
5069 pmsg->prefix_pad2 = 0;
1da177e4
LT		 5070 pmsg->prefix_ifindex = idev->dev->ifindex;
5071 pmsg->prefix_len = pinfo->prefix_len;
5072 pmsg->prefix_type = pinfo->type;
8a47077a 5073 pmsg->prefix_pad3 = 0;
1da177e4
LT		 5074 pmsg->prefix_flags = 0;
5075 if (pinfo->onlink)
5076 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
5077 if (pinfo->autoconf)
5078 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
5079
c78679e8
DM		 5080 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix))
5081 goto nla_put_failure;
1da177e4
LT		 5082 ci.preferred_time = ntohl(pinfo->prefered);
5083 ci.valid_time = ntohl(pinfo->valid);
c78679e8
DM		 5084 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci))
5085 goto nla_put_failure;
053c095a
JB		 5086 nlmsg_end(skb, nlh);
5087 return 0;
1da177e4 5088
6051e2f4 5089nla_put_failure:
26932566
PM		 5090 nlmsg_cancel(skb, nlh);
5091 return -EMSGSIZE;
1da177e4
LT		 5092}
5093
1ab1457c 5094static void inet6_prefix_notify(int event, struct inet6_dev *idev,
1da177e4
LT		 5095 struct prefix_info *pinfo)
5096{
5097 struct sk_buff *skb;
c346dca1 5098 struct net *net = dev_net(idev->dev);
8c384bfa 5099 int err = -ENOBUFS;
1da177e4 5100
339bf98f 5101 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
63159f29 5102 if (!skb)
8c384bfa
TG		 5103 goto errout;
5104
5105 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
26932566
PM		 5106 if (err < 0) {
5107 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
5108 WARN_ON(err == -EMSGSIZE);
5109 kfree_skb(skb);
5110 goto errout;
5111 }
1ce85fe4
PNA		 5112 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
5113 return;
8c384bfa
TG		 5114errout:
5115 if (err < 0)
6fda7350 5116 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
1da177e4
LT		 5117}
5118
1da177e4
LT		 5119static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
5120{
63998ac2
ND		 5121 struct net *net = dev_net(ifp->idev->dev);
5122
c15b1cca
HFS		 5123 if (event)
5124 ASSERT_RTNL();
5125
1da177e4
LT		 5126 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
5127
5128 switch (event) {
5129 case RTM_NEWADDR:
95c385b4
NH		 5130 /*
5131 * If the address was optimistic
5132 * we inserted the route at the start of
5133 * our DAD process, so we don't need
5134 * to do it again
5135 */
5136 if (!(ifp->rt->rt6i_node))
5137 ip6_ins_rt(ifp->rt);
1da177e4
LT		 5138 if (ifp->idev->cnf.forwarding)
5139 addrconf_join_anycast(ifp);
7996c799 5140 if (!ipv6_addr_any(&ifp->peer_addr))
caeaba79
ND		 5141 addrconf_prefix_route(&ifp->peer_addr, 128,
5142 ifp->idev->dev, 0, 0);
1da177e4
LT		 5143 break;
5144 case RTM_DELADDR:
5145 if (ifp->idev->cnf.forwarding)
5146 addrconf_leave_anycast(ifp);
5147 addrconf_leave_solict(ifp->idev, &ifp->addr);
7996c799 5148 if (!ipv6_addr_any(&ifp->peer_addr)) {
caeaba79 5149 struct rt6_info *rt;
caeaba79 5150
e7478dfc
ND		 5151 rt = addrconf_get_prefix_route(&ifp->peer_addr, 128,
5152 ifp->idev->dev, 0, 0);
8e3d5be7
MKL		 5153 if (rt)
5154 ip6_del_rt(rt);
caeaba79 5155 }
d8d1f30b 5156 dst_hold(&ifp->rt->dst);
93fa159a 5157
8e3d5be7 5158 ip6_del_rt(ifp->rt);
705f1c86
HFS		 5159
5160 rt_genid_bump_ipv6(net);
1da177e4
LT		 5161 break;
5162 }
63998ac2 5163 atomic_inc(&net->ipv6.dev_addr_genid);
1da177e4
LT		 5164}
5165
5166static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
5167{
8814c4b5 5168 rcu_read_lock_bh();
1da177e4
LT		 5169 if (likely(ifp->idev->dead == 0))
5170 __ipv6_ifa_notify(event, ifp);
8814c4b5 5171 rcu_read_unlock_bh();
1da177e4
LT		 5172}
5173
5174#ifdef CONFIG_SYSCTL
5175
5176static
fe2c6338 5177int addrconf_sysctl_forward(struct ctl_table *ctl, int write,
1da177e4
LT		 5178 void __user *buffer, size_t *lenp, loff_t *ppos)
5179{
5180 int *valp = ctl->data;
5181 int val = *valp;
88af182e 5182 loff_t pos = *ppos;
fe2c6338 5183 struct ctl_table lctl;
1da177e4
LT		 5184 int ret;
5185
013d97e9
FR		 5186 /*
5187 * ctl->data points to idev->cnf.forwarding, we should
5188 * not modify it until we get the rtnl lock.
5189 */
5190 lctl = *ctl;
5191 lctl.data = &val;
5192
5193 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
1da177e4 5194
c8fecf22 5195 if (write)
b325fddb 5196 ret = addrconf_fixup_forwarding(ctl, valp, val);
88af182e
EB		 5197 if (ret)
5198 *ppos = pos;
1ab1457c 5199 return ret;
1da177e4
LT		 5200}
5201
77751427
ML		 5202static
5203int addrconf_sysctl_mtu(struct ctl_table *ctl, int write,
5204 void __user *buffer, size_t *lenp, loff_t *ppos)
5205{
5206 struct inet6_dev *idev = ctl->extra1;
5207 int min_mtu = IPV6_MIN_MTU;
5208 struct ctl_table lctl;
5209
5210 lctl = *ctl;
5211 lctl.extra1 = &min_mtu;
5212 lctl.extra2 = idev ? &idev->dev->mtu : NULL;
5213
5214 return proc_dointvec_minmax(&lctl, write, buffer, lenp, ppos);
5215}
5216
56d417b1
BH		 5217static void dev_disable_change(struct inet6_dev *idev)
5218{
75538c2b
CW		 5219 struct netdev_notifier_info info;
5220
56d417b1
BH		 5221 if (!idev || !idev->dev)
5222 return;
5223
75538c2b 5224 netdev_notifier_info_init(&info, idev->dev);
56d417b1 5225 if (idev->cnf.disable_ipv6)
75538c2b 5226 addrconf_notify(NULL, NETDEV_DOWN, &info);
56d417b1 5227 else
75538c2b 5228 addrconf_notify(NULL, NETDEV_UP, &info);
56d417b1
BH		 5229}
5230
5231static void addrconf_disable_change(struct net *net, __s32 newf)
5232{
5233 struct net_device *dev;
5234 struct inet6_dev *idev;
5235
c6d14c84
ED		 5236 rcu_read_lock();
5237 for_each_netdev_rcu(net, dev) {
56d417b1
BH		 5238 idev = __in6_dev_get(dev);
5239 if (idev) {
5240 int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
5241 idev->cnf.disable_ipv6 = newf;
5242 if (changed)
5243 dev_disable_change(idev);
5244 }
56d417b1 5245 }
c6d14c84 5246 rcu_read_unlock();
56d417b1
BH		 5247}
5248
013d97e9 5249static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf)
56d417b1
BH		 5250{
5251 struct net *net;
013d97e9
FR		 5252 int old;
5253
5254 if (!rtnl_trylock())
5255 return restart_syscall();
56d417b1
BH		 5256
5257 net = (struct net *)table->extra2;
013d97e9
FR		 5258 old = *p;
5259 *p = newf;
56d417b1 5260
013d97e9
FR		 5261 if (p == &net->ipv6.devconf_dflt->disable_ipv6) {
5262 rtnl_unlock();
56d417b1 5263 return 0;
88af182e 5264 }
56d417b1
BH		 5265
5266 if (p == &net->ipv6.devconf_all->disable_ipv6) {
56d417b1
BH		 5267 net->ipv6.devconf_dflt->disable_ipv6 = newf;
5268 addrconf_disable_change(net, newf);
013d97e9 5269 } else if ((!newf) ^ (!old))
56d417b1
BH		 5270 dev_disable_change((struct inet6_dev *)table->extra1);
5271
5272 rtnl_unlock();
5273 return 0;
5274}
5275
5276static
fe2c6338 5277int addrconf_sysctl_disable(struct ctl_table *ctl, int write,
56d417b1
BH		 5278 void __user *buffer, size_t *lenp, loff_t *ppos)
5279{
5280 int *valp = ctl->data;
5281 int val = *valp;
88af182e 5282 loff_t pos = *ppos;
fe2c6338 5283 struct ctl_table lctl;
56d417b1
BH		 5284 int ret;
5285
013d97e9
FR		 5286 /*
5287 * ctl->data points to idev->cnf.disable_ipv6, we should
5288 * not modify it until we get the rtnl lock.
5289 */
5290 lctl = *ctl;
5291 lctl.data = &val;
5292
5293 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
56d417b1
BH		 5294
5295 if (write)
5296 ret = addrconf_disable_ipv6(ctl, valp, val);
88af182e
EB		 5297 if (ret)
5298 *ppos = pos;
56d417b1
BH		 5299 return ret;
5300}
5301
c92d5491 5302static
5303int addrconf_sysctl_proxy_ndp(struct ctl_table *ctl, int write,
5304 void __user *buffer, size_t *lenp, loff_t *ppos)
5305{
5306 int *valp = ctl->data;
5307 int ret;
5308 int old, new;
5309
5310 old = *valp;
5311 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
5312 new = *valp;
5313
5314 if (write && old != new) {
5315 struct net *net = ctl->extra2;
5316
5317 if (!rtnl_trylock())
5318 return restart_syscall();
5319
5320 if (valp == &net->ipv6.devconf_dflt->proxy_ndp)
5321 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
5322 NETCONFA_IFINDEX_DEFAULT,
5323 net->ipv6.devconf_dflt);
5324 else if (valp == &net->ipv6.devconf_all->proxy_ndp)
5325 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
5326 NETCONFA_IFINDEX_ALL,
5327 net->ipv6.devconf_all);
5328 else {
5329 struct inet6_dev *idev = ctl->extra1;
5330
5331 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
5332 idev->dev->ifindex,
5333 &idev->cnf);
5334 }
5335 rtnl_unlock();
5336 }
5337
5338 return ret;
5339}
5340
3d1bec99
HFS		 5341static int addrconf_sysctl_stable_secret(struct ctl_table *ctl, int write,
5342 void __user *buffer, size_t *lenp,
5343 loff_t *ppos)
5344{
5345 int err;
5346 struct in6_addr addr;
5347 char str[IPV6_MAX_STRLEN];
5348 struct ctl_table lctl = *ctl;
622c81d5 5349 struct net *net = ctl->extra2;
3d1bec99
HFS		 5350 struct ipv6_stable_secret *secret = ctl->data;
5351
622c81d5
HFS		 5352 if (&net->ipv6.devconf_all->stable_secret == ctl->data)
5353 return -EIO;
5354
3d1bec99
HFS		 5355 lctl.maxlen = IPV6_MAX_STRLEN;
5356 lctl.data = str;
5357
5358 if (!rtnl_trylock())
5359 return restart_syscall();
5360
5361 if (!write && !secret->initialized) {
5362 err = -EIO;
5363 goto out;
5364 }
5365
5366 if (!write) {
5367 err = snprintf(str, sizeof(str), "%pI6",
5368 &secret->secret);
5369 if (err >= sizeof(str)) {
5370 err = -EIO;
5371 goto out;
5372 }
5373 }
5374
5375 err = proc_dostring(&lctl, write, buffer, lenp, ppos);
5376 if (err || !write)
5377 goto out;
5378
5379 if (in6_pton(str, -1, addr.in6_u.u6_addr8, -1, NULL) != 1) {
5380 err = -EIO;
5381 goto out;
5382 }
5383
5384 secret->initialized = true;
5385 secret->secret = addr;
5386
622c81d5
HFS		 5387 if (&net->ipv6.devconf_dflt->stable_secret == ctl->data) {
5388 struct net_device *dev;
5389
5390 for_each_netdev(net, dev) {
5391 struct inet6_dev *idev = __in6_dev_get(dev);
5392
5393 if (idev) {
5394 idev->addr_gen_mode =
5395 IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
5396 }
5397 }
5398 } else {
5399 struct inet6_dev *idev = ctl->extra1;
5400
5401 idev->addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
5402 }
5403
3d1bec99
HFS		 5404out:
5405 rtnl_unlock();
5406
5407 return err;
5408}
c92d5491 5409
35103d11
AG		 5410static
5411int addrconf_sysctl_ignore_routes_with_linkdown(struct ctl_table *ctl,
5412 int write,
5413 void __user *buffer,
5414 size_t *lenp,
5415 loff_t *ppos)
5416{
5417 int *valp = ctl->data;
5418 int val = *valp;
5419 loff_t pos = *ppos;
5420 struct ctl_table lctl;
5421 int ret;
5422
5423 /* ctl->data points to idev->cnf.ignore_routes_when_linkdown
5424 * we should not modify it until we get the rtnl lock.
5425 */
5426 lctl = *ctl;
5427 lctl.data = &val;
5428
5429 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
5430
5431 if (write)
5432 ret = addrconf_fixup_linkdown(ctl, valp, val);
5433 if (ret)
5434 *ppos = pos;
5435 return ret;
5436}
5437
1da177e4
LT		 5438static struct addrconf_sysctl_table
5439{
5440 struct ctl_table_header *sysctl_header;
fe2c6338 5441 struct ctl_table addrconf_vars[DEVCONF_MAX+1];
ab32ea5d 5442} addrconf_sysctl __read_mostly = {
1da177e4
LT		 5443 .sysctl_header = NULL,
5444 .addrconf_vars = {
1ab1457c 5445 {
e21e8467
SH		 5446 .procname = "forwarding",
5447 .data = &ipv6_devconf.forwarding,
5448 .maxlen = sizeof(int),
5449 .mode = 0644,
5450 .proc_handler = addrconf_sysctl_forward,
1da177e4
LT		 5451 },
5452 {
e21e8467
SH		 5453 .procname = "hop_limit",
5454 .data = &ipv6_devconf.hop_limit,
5455 .maxlen = sizeof(int),
5456 .mode = 0644,
5457 .proc_handler = proc_dointvec,
1da177e4
LT		 5458 },
5459 {
e21e8467
SH		 5460 .procname = "mtu",
5461 .data = &ipv6_devconf.mtu6,
5462 .maxlen = sizeof(int),
5463 .mode = 0644,
77751427 5464 .proc_handler = addrconf_sysctl_mtu,
1da177e4
LT		 5465 },
5466 {
e21e8467
SH		 5467 .procname = "accept_ra",
5468 .data = &ipv6_devconf.accept_ra,
5469 .maxlen = sizeof(int),
5470 .mode = 0644,
5471 .proc_handler = proc_dointvec,
1da177e4
LT		 5472 },
5473 {
e21e8467
SH		 5474 .procname = "accept_redirects",
5475 .data = &ipv6_devconf.accept_redirects,
5476 .maxlen = sizeof(int),
5477 .mode = 0644,
5478 .proc_handler = proc_dointvec,
1da177e4
LT		 5479 },
5480 {
e21e8467
SH		 5481 .procname = "autoconf",
5482 .data = &ipv6_devconf.autoconf,
5483 .maxlen = sizeof(int),
5484 .mode = 0644,
5485 .proc_handler = proc_dointvec,
1da177e4
LT		 5486 },
5487 {
e21e8467
SH		 5488 .procname = "dad_transmits",
5489 .data = &ipv6_devconf.dad_transmits,
5490 .maxlen = sizeof(int),
5491 .mode = 0644,
5492 .proc_handler = proc_dointvec,
1da177e4
LT		 5493 },
5494 {
e21e8467
SH		 5495 .procname = "router_solicitations",
5496 .data = &ipv6_devconf.rtr_solicits,
5497 .maxlen = sizeof(int),
5498 .mode = 0644,
5499 .proc_handler = proc_dointvec,
1da177e4
LT		 5500 },
5501 {
e21e8467
SH		 5502 .procname = "router_solicitation_interval",
5503 .data = &ipv6_devconf.rtr_solicit_interval,
5504 .maxlen = sizeof(int),
5505 .mode = 0644,
5506 .proc_handler = proc_dointvec_jiffies,
1da177e4
LT		 5507 },
5508 {
e21e8467
SH		 5509 .procname = "router_solicitation_delay",
5510 .data = &ipv6_devconf.rtr_solicit_delay,
5511 .maxlen = sizeof(int),
5512 .mode = 0644,
5513 .proc_handler = proc_dointvec_jiffies,
1da177e4
LT		 5514 },
5515 {
e21e8467
SH		 5516 .procname = "force_mld_version",
5517 .data = &ipv6_devconf.force_mld_version,
5518 .maxlen = sizeof(int),
5519 .mode = 0644,
5520 .proc_handler = proc_dointvec,
1da177e4 5521 },
fc4eba58
HFS		 5522 {
5523 .procname = "mldv1_unsolicited_report_interval",
5524 .data =
5525 &ipv6_devconf.mldv1_unsolicited_report_interval,
5526 .maxlen = sizeof(int),
5527 .mode = 0644,
5528 .proc_handler = proc_dointvec_ms_jiffies,
5529 },
5530 {
5531 .procname = "mldv2_unsolicited_report_interval",
5532 .data =
5533 &ipv6_devconf.mldv2_unsolicited_report_interval,
5534 .maxlen = sizeof(int),
5535 .mode = 0644,
5536 .proc_handler = proc_dointvec_ms_jiffies,
5537 },
1da177e4 5538 {
e21e8467
SH		 5539 .procname = "use_tempaddr",
5540 .data = &ipv6_devconf.use_tempaddr,
5541 .maxlen = sizeof(int),
5542 .mode = 0644,
5543 .proc_handler = proc_dointvec,
1da177e4
LT		 5544 },
5545 {
e21e8467
SH		 5546 .procname = "temp_valid_lft",
5547 .data = &ipv6_devconf.temp_valid_lft,
5548 .maxlen = sizeof(int),
5549 .mode = 0644,
5550 .proc_handler = proc_dointvec,
1da177e4
LT		 5551 },
5552 {
e21e8467
SH		 5553 .procname = "temp_prefered_lft",
5554 .data = &ipv6_devconf.temp_prefered_lft,
5555 .maxlen = sizeof(int),
5556 .mode = 0644,
5557 .proc_handler = proc_dointvec,
1da177e4
LT		 5558 },
5559 {
e21e8467
SH		 5560 .procname = "regen_max_retry",
5561 .data = &ipv6_devconf.regen_max_retry,
5562 .maxlen = sizeof(int),
5563 .mode = 0644,
5564 .proc_handler = proc_dointvec,
1da177e4
LT		 5565 },
5566 {
e21e8467
SH		 5567 .procname = "max_desync_factor",
5568 .data = &ipv6_devconf.max_desync_factor,
5569 .maxlen = sizeof(int),
5570 .mode = 0644,
5571 .proc_handler = proc_dointvec,
1da177e4 5572 },
1da177e4 5573 {
e21e8467
SH		 5574 .procname = "max_addresses",
5575 .data = &ipv6_devconf.max_addresses,
5576 .maxlen = sizeof(int),
5577 .mode = 0644,
5578 .proc_handler = proc_dointvec,
1da177e4 5579 },
65f5c7c1 5580 {
e21e8467
SH		 5581 .procname = "accept_ra_defrtr",
5582 .data = &ipv6_devconf.accept_ra_defrtr,
5583 .maxlen = sizeof(int),
5584 .mode = 0644,
5585 .proc_handler = proc_dointvec,
65f5c7c1 5586 },
8013d1d7
HL		 5587 {
5588 .procname = "accept_ra_min_hop_limit",
5589 .data = &ipv6_devconf.accept_ra_min_hop_limit,
5590 .maxlen = sizeof(int),
5591 .mode = 0644,
5592 .proc_handler = proc_dointvec,
5593 },
c4fd30eb 5594 {
e21e8467
SH		 5595 .procname = "accept_ra_pinfo",
5596 .data = &ipv6_devconf.accept_ra_pinfo,
5597 .maxlen = sizeof(int),
5598 .mode = 0644,
5599 .proc_handler = proc_dointvec,
c4fd30eb 5600 },
930d6ff2
YH		 5601#ifdef CONFIG_IPV6_ROUTER_PREF
5602 {
e21e8467
SH		 5603 .procname = "accept_ra_rtr_pref",
5604 .data = &ipv6_devconf.accept_ra_rtr_pref,
5605 .maxlen = sizeof(int),
5606 .mode = 0644,
5607 .proc_handler = proc_dointvec,
930d6ff2 5608 },
52e16356 5609 {
e21e8467
SH		 5610 .procname = "router_probe_interval",
5611 .data = &ipv6_devconf.rtr_probe_interval,
5612 .maxlen = sizeof(int),
5613 .mode = 0644,
5614 .proc_handler = proc_dointvec_jiffies,
52e16356 5615 },
fa03ef38 5616#ifdef CONFIG_IPV6_ROUTE_INFO
09c884d4 5617 {
e21e8467
SH		 5618 .procname = "accept_ra_rt_info_max_plen",
5619 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
5620 .maxlen = sizeof(int),
5621 .mode = 0644,
5622 .proc_handler = proc_dointvec,
09c884d4
YH		 5623 },
5624#endif
930d6ff2 5625#endif
fbea49e1 5626 {
e21e8467
SH		 5627 .procname = "proxy_ndp",
5628 .data = &ipv6_devconf.proxy_ndp,
5629 .maxlen = sizeof(int),
5630 .mode = 0644,
c92d5491 5631 .proc_handler = addrconf_sysctl_proxy_ndp,
fbea49e1 5632 },
0bcbc926 5633 {
e21e8467
SH		 5634 .procname = "accept_source_route",
5635 .data = &ipv6_devconf.accept_source_route,
5636 .maxlen = sizeof(int),
5637 .mode = 0644,
5638 .proc_handler = proc_dointvec,
0bcbc926 5639 },
95c385b4
NH		 5640#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
5641 {
e21e8467
SH		 5642 .procname = "optimistic_dad",
5643 .data = &ipv6_devconf.optimistic_dad,
5644 .maxlen = sizeof(int),
5645 .mode = 0644,
5646 .proc_handler = proc_dointvec,
95c385b4
NH		 5647
5648 },
7fd2561e
EK		 5649 {
5650 .procname = "use_optimistic",
5651 .data = &ipv6_devconf.use_optimistic,
5652 .maxlen = sizeof(int),
5653 .mode = 0644,
5654 .proc_handler = proc_dointvec,
5655
5656 },
7bc570c8
YH		 5657#endif
5658#ifdef CONFIG_IPV6_MROUTE
5659 {
e21e8467
SH		 5660 .procname = "mc_forwarding",
5661 .data = &ipv6_devconf.mc_forwarding,
5662 .maxlen = sizeof(int),
5663 .mode = 0444,
5664 .proc_handler = proc_dointvec,
7bc570c8 5665 },
95c385b4 5666#endif
778d80be 5667 {
e21e8467
SH		 5668 .procname = "disable_ipv6",
5669 .data = &ipv6_devconf.disable_ipv6,
5670 .maxlen = sizeof(int),
5671 .mode = 0644,
5672 .proc_handler = addrconf_sysctl_disable,
778d80be 5673 },
1b34be74 5674 {
e21e8467
SH		 5675 .procname = "accept_dad",
5676 .data = &ipv6_devconf.accept_dad,
5677 .maxlen = sizeof(int),
5678 .mode = 0644,
5679 .proc_handler = proc_dointvec,
1b34be74 5680 },
f7734fdf 5681 {
f7734fdf
OP		 5682 .procname = "force_tllao",
5683 .data = &ipv6_devconf.force_tllao,
5684 .maxlen = sizeof(int),
5685 .mode = 0644,
5686 .proc_handler = proc_dointvec
5687 },
5cb04436
HFS		 5688 {
5689 .procname = "ndisc_notify",
5690 .data = &ipv6_devconf.ndisc_notify,
5691 .maxlen = sizeof(int),
5692 .mode = 0644,
5693 .proc_handler = proc_dointvec
5694 },
b800c3b9
HFS		 5695 {
5696 .procname = "suppress_frag_ndisc",
5697 .data = &ipv6_devconf.suppress_frag_ndisc,
5698 .maxlen = sizeof(int),
5699 .mode = 0644,
5700 .proc_handler = proc_dointvec
5701 },
d9333196
BG		 5702 {
5703 .procname = "accept_ra_from_local",
5704 .data = &ipv6_devconf.accept_ra_from_local,
5705 .maxlen = sizeof(int),
5706 .mode = 0644,
5707 .proc_handler = proc_dointvec,
5708 },
c2943f14
HH		 5709 {
5710 .procname = "accept_ra_mtu",
5711 .data = &ipv6_devconf.accept_ra_mtu,
5712 .maxlen = sizeof(int),
5713 .mode = 0644,
5714 .proc_handler = proc_dointvec,
5715 },
3d1bec99
HFS		 5716 {
5717 .procname = "stable_secret",
5718 .data = &ipv6_devconf.stable_secret,
5719 .maxlen = IPV6_MAX_STRLEN,
5720 .mode = 0600,
5721 .proc_handler = addrconf_sysctl_stable_secret,
5722 },
3985e8a3
EK		 5723 {
5724 .procname = "use_oif_addrs_only",
5725 .data = &ipv6_devconf.use_oif_addrs_only,
5726 .maxlen = sizeof(int),
5727 .mode = 0644,
5728 .proc_handler = proc_dointvec,
35103d11
AG		 5729 },
5730 {
5731 .procname = "ignore_routes_with_linkdown",
5732 .data = &ipv6_devconf.ignore_routes_with_linkdown,
5733 .maxlen = sizeof(int),
5734 .mode = 0644,
5735 .proc_handler = addrconf_sysctl_ignore_routes_with_linkdown,
3985e8a3 5736 },
1da177e4 5737 {
f8572d8f 5738 /* sentinel */
1da177e4
LT		 5739 }
5740 },
1da177e4
LT		 5741};
5742
bff16c2f 5743static int __addrconf_sysctl_register(struct net *net, char *dev_name,
f8572d8f 5744 struct inet6_dev *idev, struct ipv6_devconf *p)
1da177e4
LT		 5745{
5746 int i;
1da177e4 5747 struct addrconf_sysctl_table *t;
6105e293 5748 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ];
1dab6222 5749
af879cc7 5750 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
63159f29 5751 if (!t)
f68635e6
PE		 5752 goto out;
5753
bcdd553f 5754 for (i = 0; t->addrconf_vars[i].data; i++) {
e21e8467 5755 t->addrconf_vars[i].data += (char *)p - (char *)&ipv6_devconf;
1da177e4 5756 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
bff16c2f 5757 t->addrconf_vars[i].extra2 = net;
1da177e4 5758 }
1da177e4 5759
6105e293 5760 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name);
1da177e4 5761
6105e293 5762 t->sysctl_header = register_net_sysctl(net, path, t->addrconf_vars);
63159f29 5763 if (!t->sysctl_header)
6105e293 5764 goto free;
f68635e6
PE		 5765
5766 p->sysctl = t;
95897312 5767 return 0;
1da177e4 5768
f68635e6 5769free:
1da177e4 5770 kfree(t);
f68635e6 5771out:
95897312 5772 return -ENOBUFS;
1da177e4
LT		 5773}
5774
408c4768
PE		 5775static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
5776{
5777 struct addrconf_sysctl_table *t;
5778
63159f29 5779 if (!p->sysctl)
408c4768
PE		 5780 return;
5781
5782 t = p->sysctl;
5783 p->sysctl = NULL;
ff538818 5784 unregister_net_sysctl_table(t->sysctl_header);
408c4768
PE		 5785 kfree(t);
5786}
5787
a317a2f1 5788static int addrconf_sysctl_register(struct inet6_dev *idev)
f52295a9 5789{
a317a2f1
WC		 5790 int err;
5791
5792 if (!sysctl_dev_name_is_allowed(idev->dev->name))
5793 return -EINVAL;
5794
5795 err = neigh_sysctl_register(idev->dev, idev->nd_parms,
5796 &ndisc_ifinfo_sysctl_change);
5797 if (err)
5798 return err;
5799 err = __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
5800 idev, &idev->cnf);
5801 if (err)
5802 neigh_sysctl_unregister(idev->nd_parms);
5803
5804 return err;
f52295a9
PE		 5805}
5806
408c4768 5807static void addrconf_sysctl_unregister(struct inet6_dev *idev)
1da177e4 5808{
408c4768
PE		 5809 __addrconf_sysctl_unregister(&idev->cnf);
5810 neigh_sysctl_unregister(idev->nd_parms);
1da177e4
LT		 5811}
5812
5813
5814#endif
5815
2c8c1e72 5816static int __net_init addrconf_init_net(struct net *net)
e0da5a48 5817{
a79ca223 5818 int err = -ENOMEM;
e0da5a48
PE		 5819 struct ipv6_devconf *all, *dflt;
5820
a79ca223 5821 all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL);
63159f29 5822 if (!all)
a79ca223 5823 goto err_alloc_all;
e0da5a48 5824
a79ca223 5825 dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
63159f29 5826 if (!dflt)
a79ca223 5827 goto err_alloc_dflt;
e0da5a48 5828
a79ca223
HZ		 5829 /* these will be inherited by all namespaces */
5830 dflt->autoconf = ipv6_defaults.autoconf;
5831 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
e0da5a48 5832
3d1bec99
HFS		 5833 dflt->stable_secret.initialized = false;
5834 all->stable_secret.initialized = false;
5835
e0da5a48
PE		 5836 net->ipv6.devconf_all = all;
5837 net->ipv6.devconf_dflt = dflt;
5838
5839#ifdef CONFIG_SYSCTL
f8572d8f 5840 err = __addrconf_sysctl_register(net, "all", NULL, all);
e0da5a48
PE		 5841 if (err < 0)
5842 goto err_reg_all;
5843
f8572d8f 5844 err = __addrconf_sysctl_register(net, "default", NULL, dflt);
e0da5a48
PE		 5845 if (err < 0)
5846 goto err_reg_dflt;
5847#endif
5848 return 0;
5849
5850#ifdef CONFIG_SYSCTL
5851err_reg_dflt:
5852 __addrconf_sysctl_unregister(all);
5853err_reg_all:
5854 kfree(dflt);
5855#endif
5856err_alloc_dflt:
5857 kfree(all);
5858err_alloc_all:
5859 return err;
5860}
5861
2c8c1e72 5862static void __net_exit addrconf_exit_net(struct net *net)
e0da5a48
PE		 5863{
5864#ifdef CONFIG_SYSCTL
5865 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
5866 __addrconf_sysctl_unregister(net->ipv6.devconf_all);
5867#endif
73cf0e92 5868 kfree(net->ipv6.devconf_dflt);
5869 kfree(net->ipv6.devconf_all);
e0da5a48
PE		 5870}
5871
5872static struct pernet_operations addrconf_ops = {
5873 .init = addrconf_init_net,
5874 .exit = addrconf_exit_net,
5875};
5876
207895fd 5877static struct rtnl_af_ops inet6_ops __read_mostly = {
b382b191
TG		 5878 .family = AF_INET6,
5879 .fill_link_af = inet6_fill_link_af,
5880 .get_link_af_size = inet6_get_link_af_size,
11b1f828 5881 .validate_link_af = inet6_validate_link_af,
f53adae4 5882 .set_link_af = inet6_set_link_af,
b382b191
TG		 5883};
5884
1da177e4
LT		 5885/*
5886 * Init / cleanup code
5887 */
5888
5889int __init addrconf_init(void)
5890{
a317a2f1 5891 struct inet6_dev *idev;
c2e21293 5892 int i, err;
2a8cc6c8 5893
e21e8467
SH		 5894 err = ipv6_addr_label_init();
5895 if (err < 0) {
f3213831
JP		 5896 pr_crit("%s: cannot initialize default policy table: %d\n",
5897 __func__, err);
2cc6d2bf 5898 goto out;
2a8cc6c8 5899 }
1da177e4 5900
2cc6d2bf
NH		 5901 err = register_pernet_subsys(&addrconf_ops);
5902 if (err < 0)
5903 goto out_addrlabel;
e0da5a48 5904
c15b1cca
HFS		 5905 addrconf_wq = create_workqueue("ipv6_addrconf");
5906 if (!addrconf_wq) {
5907 err = -ENOMEM;
5908 goto out_nowq;
5909 }
5910
1da177e4
LT		 5911 /* The addrconf netdev notifier requires that loopback_dev
5912 * has it's ipv6 private information allocated and setup
5913 * before it can bring up and give link-local addresses
5914 * to other devices which are up.
5915 *
5916 * Unfortunately, loopback_dev is not necessarily the first
5917 * entry in the global dev_base list of net devices. In fact,
5918 * it is likely to be the very last entry on that list.
5919 * So this causes the notifier registry below to try and
5920 * give link-local addresses to all devices besides loopback_dev
5921 * first, then loopback_dev, which cases all the non-loopback_dev
5922 * devices to fail to get a link-local address.
5923 *
5924 * So, as a temporary fix, allocate the ipv6 structure for
5925 * loopback_dev first by hand.
5926 * Longer term, all of the dependencies ipv6 has upon the loopback
5927 * device and it being up should be removed.
5928 */
5929 rtnl_lock();
a317a2f1 5930 idev = ipv6_add_dev(init_net.loopback_dev);
1da177e4 5931 rtnl_unlock();
a317a2f1
WC		 5932 if (IS_ERR(idev)) {
5933 err = PTR_ERR(idev);
e0da5a48 5934 goto errlo;
a317a2f1 5935 }
1da177e4 5936
c2e21293 5937 for (i = 0; i < IN6_ADDR_HSIZE; i++)
5938 INIT_HLIST_HEAD(&inet6_addr_lst[i]);
5939
1da177e4
LT		 5940 register_netdevice_notifier(&ipv6_dev_notf);
5941
c15b1cca 5942 addrconf_verify();
c127ea2c 5943
3678a9d8 5944 rtnl_af_register(&inet6_ops);
b382b191 5945
c7ac8679
GR		 5946 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo,
5947 NULL);
c127ea2c
TG		 5948 if (err < 0)
5949 goto errout;
5950
5951 /* Only the first call to __rtnl_register can fail */
c7ac8679
GR		 5952 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL, NULL);
5953 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL, NULL);
5954 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr,
5955 inet6_dump_ifaddr, NULL);
5956 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL,
5957 inet6_dump_ifmcaddr, NULL);
5958 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL,
5959 inet6_dump_ifacaddr, NULL);
76f8f6cb 5960 __rtnl_register(PF_INET6, RTM_GETNETCONF, inet6_netconf_get_devconf,
7a674200 5961 inet6_netconf_dump_devconf, NULL);
c127ea2c 5962
2a8cc6c8
YH		 5963 ipv6_addr_label_rtnl_register();
5964
1da177e4 5965 return 0;
c127ea2c 5966errout:
b382b191 5967 rtnl_af_unregister(&inet6_ops);
c127ea2c 5968 unregister_netdevice_notifier(&ipv6_dev_notf);
e0da5a48 5969errlo:
c15b1cca
HFS		 5970 destroy_workqueue(addrconf_wq);
5971out_nowq:
e0da5a48 5972 unregister_pernet_subsys(&addrconf_ops);
2cc6d2bf
NH		 5973out_addrlabel:
5974 ipv6_addr_label_cleanup();
5975out:
c127ea2c 5976 return err;
1da177e4
LT		 5977}
5978
09f7709f 5979void addrconf_cleanup(void)
1da177e4 5980{
176c39af 5981 struct net_device *dev;
1da177e4
LT		 5982 int i;
5983
5984 unregister_netdevice_notifier(&ipv6_dev_notf);
e0da5a48 5985 unregister_pernet_subsys(&addrconf_ops);
2cc6d2bf 5986 ipv6_addr_label_cleanup();
1da177e4
LT		 5987
5988 rtnl_lock();
5989
b382b191
TG		 5990 __rtnl_af_unregister(&inet6_ops);
5991
176c39af
DL		 5992 /* clean dev list */
5993 for_each_netdev(&init_net, dev) {
5994 if (__in6_dev_get(dev) == NULL)
5995 continue;
5996 addrconf_ifdown(dev, 1);
5997 }
5998 addrconf_ifdown(init_net.loopback_dev, 2);
5999
1da177e4
LT		 6000 /*
6001 * Check hash table.
6002 */
5c578aed 6003 spin_lock_bh(&addrconf_hash_lock);
c2e21293 6004 for (i = 0; i < IN6_ADDR_HSIZE; i++)
6005 WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
5c578aed 6006 spin_unlock_bh(&addrconf_hash_lock);
c15b1cca 6007 cancel_delayed_work(&addr_chk_work);
1da177e4 6008 rtnl_unlock();
c15b1cca
HFS		 6009
6010 destroy_workqueue(addrconf_wq);
1da177e4 6011}
Linux 6.x block layer and io_uring tree(s)