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ipv4: namespacify ip_early_demux sysctl knob
[deliverable/linux.git] / net / ipv6 / addrconf.c
CommitLineData
1da177e4
LT		 1/*
2 * IPv6 Address [auto]configuration
3 * Linux INET6 implementation
4 *
5 * Authors:
1ab1457c 6 * Pedro Roque <roque@di.fc.ul.pt>
1da177e4
LT		 7 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
8 *
1da177e4
LT		 9 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License
11 * as published by the Free Software Foundation; either version
12 * 2 of the License, or (at your option) any later version.
13 */
14
15/*
16 * Changes:
17 *
18 * Janos Farkas : delete timer on ifdown
19 * <chexum@bankinf.banki.hu>
20 * Andi Kleen : kill double kfree on module
21 * unload.
22 * Maciej W. Rozycki : FDDI support
23 * sekiya@USAGI : Don't send too many RS
24 * packets.
25 * yoshfuji@USAGI : Fixed interval between DAD
26 * packets.
27 * YOSHIFUJI Hideaki @USAGI : improved accuracy of
28 * address validation timer.
29 * YOSHIFUJI Hideaki @USAGI : Privacy Extensions (RFC3041)
30 * support.
31 * Yuji SEKIYA @USAGI : Don't assign a same IPv6
32 * address on a same interface.
33 * YOSHIFUJI Hideaki @USAGI : ARCnet support
34 * YOSHIFUJI Hideaki @USAGI : convert /proc/net/if_inet6 to
35 * seq_file.
b1cacb68
YH		 36 * YOSHIFUJI Hideaki @USAGI : improved source address
37 * selection; consider scope,
38 * status etc.
1da177e4
LT		 39 */
40
f3213831
JP		 41#define pr_fmt(fmt) "IPv6: " fmt
42
1da177e4
LT		 43#include <linux/errno.h>
44#include <linux/types.h>
a0bffffc 45#include <linux/kernel.h>
1da177e4
LT		 46#include <linux/socket.h>
47#include <linux/sockios.h>
1da177e4 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
5241c2d7 73#include <net/6lowpan.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));
9b29c696
HFS		 353
354 if (ndev->cnf.stable_secret.initialized)
355 ndev->addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
356 else
357 ndev->addr_gen_mode = IN6_ADDR_GEN_MODE_EUI64;
358
322f74a4
IO		 359 ndev->cnf.mtu6 = dev->mtu;
360 ndev->cnf.sysctl = NULL;
361 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
63159f29 362 if (!ndev->nd_parms) {
322f74a4 363 kfree(ndev);
a317a2f1 364 return ERR_PTR(err);
322f74a4 365 }
0187bdfb
BH		 366 if (ndev->cnf.forwarding)
367 dev_disable_lro(dev);
322f74a4
IO		 368 /* We refer to the device */
369 dev_hold(dev);
1da177e4 370
322f74a4 371 if (snmp6_alloc_dev(ndev) < 0) {
ba3542e1 372 ADBG(KERN_WARNING
f3213831 373 "%s: cannot allocate memory for statistics; dev=%s.\n",
ba3542e1 374 __func__, dev->name);
322f74a4 375 neigh_parms_release(&nd_tbl, ndev->nd_parms);
8603e33d
RL		 376 dev_put(dev);
377 kfree(ndev);
a317a2f1 378 return ERR_PTR(err);
322f74a4 379 }
1da177e4 380
322f74a4 381 if (snmp6_register_dev(ndev) < 0) {
ba3542e1 382 ADBG(KERN_WARNING
f3213831 383 "%s: cannot create /proc/net/dev_snmp6/%s\n",
ba3542e1 384 __func__, dev->name);
a317a2f1 385 goto err_release;
322f74a4
IO		 386 }
387
388 /* One reference from device. We must do this before
389 * we invoke __ipv6_regen_rndid().
390 */
391 in6_dev_hold(ndev);
1da177e4 392
1b34be74
YH		 393 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
394 ndev->cnf.accept_dad = -1;
395
07a93626 396#if IS_ENABLED(CONFIG_IPV6_SIT)
b077d7ab 397 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
f3213831 398 pr_info("%s: Disabled Multicast RS\n", dev->name);
b077d7ab
YH		 399 ndev->cnf.rtr_solicits = 0;
400 }
401#endif
402
372e6c8f 403 INIT_LIST_HEAD(&ndev->tempaddr_list);
b24b8a24 404 setup_timer(&ndev->regen_timer, ipv6_regen_rndid, (unsigned long)ndev);
322f74a4
IO		 405 if ((dev->flags&IFF_LOOPBACK) ||
406 dev->type == ARPHRD_TUNNEL ||
9625ed72 407 dev->type == ARPHRD_TUNNEL6 ||
0be669bb 408 dev->type == ARPHRD_SIT ||
0be669bb 409 dev->type == ARPHRD_NONE) {
322f74a4
IO		 410 ndev->cnf.use_tempaddr = -1;
411 } else {
412 in6_dev_hold(ndev);
413 ipv6_regen_rndid((unsigned long) ndev);
414 }
5d9efa7e 415
914faa14 416 ndev->token = in6addr_any;
1da177e4 417
f24e3d65 418 if (netif_running(dev) && addrconf_qdisc_ok(dev))
53aadcc9
HX		 419 ndev->if_flags |= IF_READY;
420
322f74a4
IO		 421 ipv6_mc_init_dev(ndev);
422 ndev->tstamp = jiffies;
a317a2f1
WC		 423 err = addrconf_sysctl_register(ndev);
424 if (err) {
425 ipv6_mc_destroy_dev(ndev);
426 del_timer(&ndev->regen_timer);
2a189f9e 427 snmp6_unregister_dev(ndev);
a317a2f1
WC		 428 goto err_release;
429 }
30c4cf57 430 /* protected by rtnl_lock */
cf778b00 431 rcu_assign_pointer(dev->ip6_ptr, ndev);
d88ae4cc 432
2c5e8933
HFS		 433 /* Join interface-local all-node multicast group */
434 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allnodes);
435
d88ae4cc 436 /* Join all-node multicast group */
f3ee4010 437 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);
d88ae4cc 438
d6ddef9e 439 /* Join all-router multicast group if forwarding is set */
8b2aaede 440 if (ndev->cnf.forwarding && (dev->flags & IFF_MULTICAST))
d6ddef9e
LW		 441 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
442
1da177e4 443 return ndev;
a317a2f1
WC		 444
445err_release:
446 neigh_parms_release(&nd_tbl, ndev->nd_parms);
447 ndev->dead = 1;
448 in6_dev_finish_destroy(ndev);
449 return ERR_PTR(err);
1da177e4
LT		 450}
451
8e5e8f30 452static struct inet6_dev *ipv6_find_idev(struct net_device *dev)
1da177e4
LT		 453{
454 struct inet6_dev *idev;
455
456 ASSERT_RTNL();
457
e21e8467
SH		 458 idev = __in6_dev_get(dev);
459 if (!idev) {
460 idev = ipv6_add_dev(dev);
a317a2f1 461 if (IS_ERR(idev))
1da177e4
LT		 462 return NULL;
463 }
c5e33bdd 464
1da177e4
LT		 465 if (dev->flags&IFF_UP)
466 ipv6_mc_up(idev);
467 return idev;
468}
469
f3a1bfb1
ND		 470static int inet6_netconf_msgsize_devconf(int type)
471{
472 int size = NLMSG_ALIGN(sizeof(struct netconfmsg))
473 + nla_total_size(4); /* NETCONFA_IFINDEX */
474
76f8f6cb
ND		 475 /* type -1 is used for ALL */
476 if (type == -1 || type == NETCONFA_FORWARDING)
f3a1bfb1 477 size += nla_total_size(4);
b1afce95 478#ifdef CONFIG_IPV6_MROUTE
d67b8c61
ND		 479 if (type == -1 || type == NETCONFA_MC_FORWARDING)
480 size += nla_total_size(4);
b1afce95 481#endif
c92d5491 482 if (type == -1 || type == NETCONFA_PROXY_NEIGH)
483 size += nla_total_size(4);
f3a1bfb1 484
35103d11
AG		 485 if (type == -1 || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN)
486 size += nla_total_size(4);
487
f3a1bfb1
ND		 488 return size;
489}
490
491static int inet6_netconf_fill_devconf(struct sk_buff *skb, int ifindex,
492 struct ipv6_devconf *devconf, u32 portid,
493 u32 seq, int event, unsigned int flags,
494 int type)
495{
496 struct nlmsghdr *nlh;
497 struct netconfmsg *ncm;
498
499 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg),
500 flags);
63159f29 501 if (!nlh)
f3a1bfb1
ND		 502 return -EMSGSIZE;
503
504 ncm = nlmsg_data(nlh);
505 ncm->ncm_family = AF_INET6;
506
507 if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0)
508 goto nla_put_failure;
509
76f8f6cb
ND		 510 /* type -1 is used for ALL */
511 if ((type == -1 || type == NETCONFA_FORWARDING) &&
f3a1bfb1
ND		 512 nla_put_s32(skb, NETCONFA_FORWARDING, devconf->forwarding) < 0)
513 goto nla_put_failure;
b1afce95 514#ifdef CONFIG_IPV6_MROUTE
d67b8c61
ND		 515 if ((type == -1 || type == NETCONFA_MC_FORWARDING) &&
516 nla_put_s32(skb, NETCONFA_MC_FORWARDING,
517 devconf->mc_forwarding) < 0)
518 goto nla_put_failure;
b1afce95 519#endif
c92d5491 520 if ((type == -1 || type == NETCONFA_PROXY_NEIGH) &&
521 nla_put_s32(skb, NETCONFA_PROXY_NEIGH, devconf->proxy_ndp) < 0)
522 goto nla_put_failure;
523
35103d11
AG		 524 if ((type == -1 || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN) &&
525 nla_put_s32(skb, NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
526 devconf->ignore_routes_with_linkdown) < 0)
527 goto nla_put_failure;
528
053c095a
JB		 529 nlmsg_end(skb, nlh);
530 return 0;
f3a1bfb1
ND		 531
532nla_put_failure:
533 nlmsg_cancel(skb, nlh);
534 return -EMSGSIZE;
535}
536
d67b8c61
ND		 537void inet6_netconf_notify_devconf(struct net *net, int type, int ifindex,
538 struct ipv6_devconf *devconf)
f3a1bfb1
ND		 539{
540 struct sk_buff *skb;
541 int err = -ENOBUFS;
542
543 skb = nlmsg_new(inet6_netconf_msgsize_devconf(type), GFP_ATOMIC);
63159f29 544 if (!skb)
f3a1bfb1
ND		 545 goto errout;
546
547 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 0, 0,
548 RTM_NEWNETCONF, 0, type);
549 if (err < 0) {
550 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
551 WARN_ON(err == -EMSGSIZE);
552 kfree_skb(skb);
553 goto errout;
554 }
555 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_NETCONF, NULL, GFP_ATOMIC);
556 return;
557errout:
bd779028 558 rtnl_set_sk_err(net, RTNLGRP_IPV6_NETCONF, err);
f3a1bfb1
ND		 559}
560
76f8f6cb
ND		 561static const struct nla_policy devconf_ipv6_policy[NETCONFA_MAX+1] = {
562 [NETCONFA_IFINDEX] = { .len = sizeof(int) },
563 [NETCONFA_FORWARDING] = { .len = sizeof(int) },
c92d5491 564 [NETCONFA_PROXY_NEIGH] = { .len = sizeof(int) },
35103d11 565 [NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN] = { .len = sizeof(int) },
76f8f6cb
ND		 566};
567
568static int inet6_netconf_get_devconf(struct sk_buff *in_skb,
661d2967 569 struct nlmsghdr *nlh)
76f8f6cb
ND		 570{
571 struct net *net = sock_net(in_skb->sk);
572 struct nlattr *tb[NETCONFA_MAX+1];
573 struct netconfmsg *ncm;
574 struct sk_buff *skb;
575 struct ipv6_devconf *devconf;
576 struct inet6_dev *in6_dev;
577 struct net_device *dev;
578 int ifindex;
579 int err;
580
581 err = nlmsg_parse(nlh, sizeof(*ncm), tb, NETCONFA_MAX,
582 devconf_ipv6_policy);
583 if (err < 0)
584 goto errout;
585
586 err = EINVAL;
587 if (!tb[NETCONFA_IFINDEX])
588 goto errout;
589
590 ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]);
591 switch (ifindex) {
592 case NETCONFA_IFINDEX_ALL:
593 devconf = net->ipv6.devconf_all;
594 break;
595 case NETCONFA_IFINDEX_DEFAULT:
596 devconf = net->ipv6.devconf_dflt;
597 break;
598 default:
599 dev = __dev_get_by_index(net, ifindex);
63159f29 600 if (!dev)
76f8f6cb
ND		 601 goto errout;
602 in6_dev = __in6_dev_get(dev);
63159f29 603 if (!in6_dev)
76f8f6cb
ND		 604 goto errout;
605 devconf = &in6_dev->cnf;
606 break;
607 }
608
609 err = -ENOBUFS;
610 skb = nlmsg_new(inet6_netconf_msgsize_devconf(-1), GFP_ATOMIC);
63159f29 611 if (!skb)
76f8f6cb
ND		 612 goto errout;
613
614 err = inet6_netconf_fill_devconf(skb, ifindex, devconf,
615 NETLINK_CB(in_skb).portid,
616 nlh->nlmsg_seq, RTM_NEWNETCONF, 0,
617 -1);
618 if (err < 0) {
619 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
620 WARN_ON(err == -EMSGSIZE);
621 kfree_skb(skb);
622 goto errout;
623 }
624 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
625errout:
626 return err;
627}
628
7a674200
ND		 629static int inet6_netconf_dump_devconf(struct sk_buff *skb,
630 struct netlink_callback *cb)
631{
632 struct net *net = sock_net(skb->sk);
633 int h, s_h;
634 int idx, s_idx;
635 struct net_device *dev;
636 struct inet6_dev *idev;
637 struct hlist_head *head;
638
639 s_h = cb->args[0];
640 s_idx = idx = cb->args[1];
641
642 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
643 idx = 0;
644 head = &net->dev_index_head[h];
645 rcu_read_lock();
63998ac2
ND		 646 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^
647 net->dev_base_seq;
7a674200
ND		 648 hlist_for_each_entry_rcu(dev, head, index_hlist) {
649 if (idx < s_idx)
650 goto cont;
651 idev = __in6_dev_get(dev);
652 if (!idev)
653 goto cont;
654
655 if (inet6_netconf_fill_devconf(skb, dev->ifindex,
656 &idev->cnf,
657 NETLINK_CB(cb->skb).portid,
658 cb->nlh->nlmsg_seq,
659 RTM_NEWNETCONF,
660 NLM_F_MULTI,
053c095a 661 -1) < 0) {
7a674200
ND		 662 rcu_read_unlock();
663 goto done;
664 }
63998ac2 665 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
7a674200
ND		 666cont:
667 idx++;
668 }
669 rcu_read_unlock();
670 }
671 if (h == NETDEV_HASHENTRIES) {
672 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL,
673 net->ipv6.devconf_all,
674 NETLINK_CB(cb->skb).portid,
675 cb->nlh->nlmsg_seq,
676 RTM_NEWNETCONF, NLM_F_MULTI,
053c095a 677 -1) < 0)
7a674200
ND		 678 goto done;
679 else
680 h++;
681 }
682 if (h == NETDEV_HASHENTRIES + 1) {
683 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT,
684 net->ipv6.devconf_dflt,
685 NETLINK_CB(cb->skb).portid,
686 cb->nlh->nlmsg_seq,
687 RTM_NEWNETCONF, NLM_F_MULTI,
053c095a 688 -1) < 0)
7a674200
ND		 689 goto done;
690 else
691 h++;
692 }
693done:
694 cb->args[0] = h;
695 cb->args[1] = idx;
696
697 return skb->len;
698}
699
1da177e4
LT		 700#ifdef CONFIG_SYSCTL
701static void dev_forward_change(struct inet6_dev *idev)
702{
703 struct net_device *dev;
704 struct inet6_ifaddr *ifa;
1da177e4
LT		 705
706 if (!idev)
707 return;
708 dev = idev->dev;
0187bdfb
BH		 709 if (idev->cnf.forwarding)
710 dev_disable_lro(dev);
1a940835 711 if (dev->flags & IFF_MULTICAST) {
2c5e8933 712 if (idev->cnf.forwarding) {
f3ee4010 713 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
2c5e8933
HFS		 714 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allrouters);
715 ipv6_dev_mc_inc(dev, &in6addr_sitelocal_allrouters);
716 } else {
f3ee4010 717 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
2c5e8933
HFS		 718 ipv6_dev_mc_dec(dev, &in6addr_interfacelocal_allrouters);
719 ipv6_dev_mc_dec(dev, &in6addr_sitelocal_allrouters);
720 }
1da177e4 721 }
502a2ffd 722
723 list_for_each_entry(ifa, &idev->addr_list, if_list) {
2c12a74c
MW		 724 if (ifa->flags&IFA_F_TENTATIVE)
725 continue;
1da177e4
LT		 726 if (idev->cnf.forwarding)
727 addrconf_join_anycast(ifa);
728 else
729 addrconf_leave_anycast(ifa);
730 }
f3a1bfb1
ND		 731 inet6_netconf_notify_devconf(dev_net(dev), NETCONFA_FORWARDING,
732 dev->ifindex, &idev->cnf);
1da177e4
LT		 733}
734
735
e186932b 736static void addrconf_forward_change(struct net *net, __s32 newf)
1da177e4
LT		 737{
738 struct net_device *dev;
739 struct inet6_dev *idev;
740
4acd4945 741 for_each_netdev(net, dev) {
1da177e4
LT		 742 idev = __in6_dev_get(dev);
743 if (idev) {
e186932b
PE		 744 int changed = (!idev->cnf.forwarding) ^ (!newf);
745 idev->cnf.forwarding = newf;
1da177e4
LT		 746 if (changed)
747 dev_forward_change(idev);
748 }
1da177e4 749 }
1da177e4 750}
c8fecf22 751
013d97e9 752static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf)
c8fecf22 753{
bff16c2f 754 struct net *net;
013d97e9
FR		 755 int old;
756
757 if (!rtnl_trylock())
758 return restart_syscall();
bff16c2f
PE		 759
760 net = (struct net *)table->extra2;
013d97e9
FR		 761 old = *p;
762 *p = newf;
b325fddb 763
013d97e9 764 if (p == &net->ipv6.devconf_dflt->forwarding) {
f3a1bfb1
ND		 765 if ((!newf) ^ (!old))
766 inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING,
767 NETCONFA_IFINDEX_DEFAULT,
768 net->ipv6.devconf_dflt);
013d97e9
FR		 769 rtnl_unlock();
770 return 0;
88af182e 771 }
c8fecf22 772
e186932b 773 if (p == &net->ipv6.devconf_all->forwarding) {
e186932b
PE		 774 net->ipv6.devconf_dflt->forwarding = newf;
775 addrconf_forward_change(net, newf);
f3a1bfb1
ND		 776 if ((!newf) ^ (!old))
777 inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING,
778 NETCONFA_IFINDEX_ALL,
779 net->ipv6.devconf_all);
013d97e9 780 } else if ((!newf) ^ (!old))
c8fecf22 781 dev_forward_change((struct inet6_dev *)table->extra1);
0187bdfb 782 rtnl_unlock();
c8fecf22 783
013d97e9 784 if (newf)
7b4da532 785 rt6_purge_dflt_routers(net);
b325fddb 786 return 1;
c8fecf22 787}
35103d11
AG		 788
789static void addrconf_linkdown_change(struct net *net, __s32 newf)
790{
791 struct net_device *dev;
792 struct inet6_dev *idev;
793
794 for_each_netdev(net, dev) {
795 idev = __in6_dev_get(dev);
796 if (idev) {
797 int changed = (!idev->cnf.ignore_routes_with_linkdown) ^ (!newf);
798
799 idev->cnf.ignore_routes_with_linkdown = newf;
800 if (changed)
801 inet6_netconf_notify_devconf(dev_net(dev),
802 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
803 dev->ifindex,
804 &idev->cnf);
805 }
806 }
807}
808
809static int addrconf_fixup_linkdown(struct ctl_table *table, int *p, int newf)
810{
811 struct net *net;
812 int old;
813
814 if (!rtnl_trylock())
815 return restart_syscall();
816
817 net = (struct net *)table->extra2;
818 old = *p;
819 *p = newf;
820
821 if (p == &net->ipv6.devconf_dflt->ignore_routes_with_linkdown) {
822 if ((!newf) ^ (!old))
823 inet6_netconf_notify_devconf(net,
824 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
825 NETCONFA_IFINDEX_DEFAULT,
826 net->ipv6.devconf_dflt);
827 rtnl_unlock();
828 return 0;
829 }
830
831 if (p == &net->ipv6.devconf_all->ignore_routes_with_linkdown) {
832 net->ipv6.devconf_dflt->ignore_routes_with_linkdown = newf;
833 addrconf_linkdown_change(net, newf);
834 if ((!newf) ^ (!old))
835 inet6_netconf_notify_devconf(net,
836 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
837 NETCONFA_IFINDEX_ALL,
838 net->ipv6.devconf_all);
839 }
840 rtnl_unlock();
841
842 return 1;
843}
844
1da177e4
LT		 845#endif
846
5c578aed 847/* Nobody refers to this ifaddr, destroy it */
1da177e4
LT		 848void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
849{
c2e21293 850 WARN_ON(!hlist_unhashed(&ifp->addr_lst));
547b792c 851
1da177e4 852#ifdef NET_REFCNT_DEBUG
91df42be 853 pr_debug("%s\n", __func__);
1da177e4
LT		 854#endif
855
856 in6_dev_put(ifp->idev);
857
c15b1cca
HFS		 858 if (cancel_delayed_work(&ifp->dad_work))
859 pr_notice("delayed DAD work was pending while freeing ifa=%p\n",
860 ifp);
1da177e4 861
e9d3e084 862 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
f3213831 863 pr_warn("Freeing alive inet6 address %p\n", ifp);
1da177e4
LT		 864 return;
865 }
94e187c0 866 ip6_rt_put(ifp->rt);
1da177e4 867
e5785985 868 kfree_rcu(ifp, rcu);
1da177e4
LT		 869}
870
e55ffac6
BH		 871static void
872ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
873{
502a2ffd 874 struct list_head *p;
8a6ce0c0 875 int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
e55ffac6
BH		 876
877 /*
878 * Each device address list is sorted in order of scope -
879 * global before linklocal.
880 */
502a2ffd 881 list_for_each(p, &idev->addr_list) {
882 struct inet6_ifaddr *ifa
883 = list_entry(p, struct inet6_ifaddr, if_list);
8a6ce0c0 884 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
e55ffac6
BH		 885 break;
886 }
887
b54c9b98 888 list_add_tail(&ifp->if_list, p);
e55ffac6
BH		 889}
890
ddbe5032 891static u32 inet6_addr_hash(const struct in6_addr *addr)
3eb84f49 892{
ddbe5032 893 return hash_32(ipv6_addr_hash(addr), IN6_ADDR_HSIZE_SHIFT);
3eb84f49
YH		 894}
895
1da177e4
LT		 896/* On success it returns ifp with increased reference count */
897
898static struct inet6_ifaddr *
3f8f5298
JP		 899ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
900 const struct in6_addr *peer_addr, int pfxlen,
8a226b2c 901 int scope, u32 flags, u32 valid_lft, u32 prefered_lft)
1da177e4
LT		 902{
903 struct inet6_ifaddr *ifa = NULL;
904 struct rt6_info *rt;
3a88a81d 905 unsigned int hash;
1da177e4 906 int err = 0;
d68b8270
YH		 907 int addr_type = ipv6_addr_type(addr);
908
909 if (addr_type == IPV6_ADDR_ANY ||
910 addr_type & IPV6_ADDR_MULTICAST ||
911 (!(idev->dev->flags & IFF_LOOPBACK) &&
912 addr_type & IPV6_ADDR_LOOPBACK))
913 return ERR_PTR(-EADDRNOTAVAIL);
1da177e4 914
8814c4b5 915 rcu_read_lock_bh();
1da177e4
LT		 916 if (idev->dead) {
917 err = -ENODEV; /*XXX*/
918 goto out2;
919 }
920
56d417b1 921 if (idev->cnf.disable_ipv6) {
9bdd8d40
BH		 922 err = -EACCES;
923 goto out2;
924 }
925
5c578aed 926 spin_lock(&addrconf_hash_lock);
1da177e4
LT		 927
928 /* Ignore adding duplicate addresses on an interface */
c346dca1 929 if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) {
ba3542e1 930 ADBG("ipv6_add_addr: already assigned\n");
1da177e4
LT		 931 err = -EEXIST;
932 goto out;
933 }
934
322f74a4 935 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
1da177e4 936
63159f29 937 if (!ifa) {
ba3542e1 938 ADBG("ipv6_add_addr: malloc failed\n");
1da177e4
LT		 939 err = -ENOBUFS;
940 goto out;
941 }
942
8f031519 943 rt = addrconf_dst_alloc(idev, addr, false);
1da177e4
LT		 944 if (IS_ERR(rt)) {
945 err = PTR_ERR(rt);
946 goto out;
947 }
948
bba24896
JP		 949 neigh_parms_data_state_setall(idev->nd_parms);
950
4e3fd7a0 951 ifa->addr = *addr;
3f8f5298
JP		 952 if (peer_addr)
953 ifa->peer_addr = *peer_addr;
1da177e4
LT		 954
955 spin_lock_init(&ifa->lock);
c15b1cca 956 INIT_DELAYED_WORK(&ifa->dad_work, addrconf_dad_work);
c2e21293 957 INIT_HLIST_NODE(&ifa->addr_lst);
1da177e4
LT		 958 ifa->scope = scope;
959 ifa->prefix_len = pfxlen;
960 ifa->flags = flags | IFA_F_TENTATIVE;
8a226b2c
JB		 961 ifa->valid_lft = valid_lft;
962 ifa->prefered_lft = prefered_lft;
1da177e4 963 ifa->cstamp = ifa->tstamp = jiffies;
617fe29d 964 ifa->tokenized = false;
1da177e4 965
57f5f544
KF		 966 ifa->rt = rt;
967
1da177e4
LT		 968 ifa->idev = idev;
969 in6_dev_hold(idev);
970 /* For caller */
971 in6_ifa_hold(ifa);
972
973 /* Add to big hash table */
ddbe5032 974 hash = inet6_addr_hash(addr);
1da177e4 975
5c578aed 976 hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]);
5c578aed 977 spin_unlock(&addrconf_hash_lock);
1da177e4
LT		 978
979 write_lock(&idev->lock);
980 /* Add to inet6_dev unicast addr list. */
e55ffac6 981 ipv6_link_dev_addr(idev, ifa);
1da177e4 982
1da177e4 983 if (ifa->flags&IFA_F_TEMPORARY) {
372e6c8f 984 list_add(&ifa->tmp_list, &idev->tempaddr_list);
1da177e4
LT		 985 in6_ifa_hold(ifa);
986 }
1da177e4 987
1da177e4
LT		 988 in6_ifa_hold(ifa);
989 write_unlock(&idev->lock);
990out2:
8814c4b5 991 rcu_read_unlock_bh();
1da177e4 992
fd92833a 993 if (likely(err == 0))
f88c91dd 994 inet6addr_notifier_call_chain(NETDEV_UP, ifa);
1da177e4
LT		 995 else {
996 kfree(ifa);
997 ifa = ERR_PTR(err);
998 }
999
1000 return ifa;
1001out:
5c578aed 1002 spin_unlock(&addrconf_hash_lock);
1da177e4
LT		 1003 goto out2;
1004}
1005
5b84efec
TH		 1006enum cleanup_prefix_rt_t {
1007 CLEANUP_PREFIX_RT_NOP, /* no cleanup action for prefix route */
1008 CLEANUP_PREFIX_RT_DEL, /* delete the prefix route */
1009 CLEANUP_PREFIX_RT_EXPIRE, /* update the lifetime of the prefix route */
1010};
1011
1012/*
1013 * Check, whether the prefix for ifp would still need a prefix route
1014 * after deleting ifp. The function returns one of the CLEANUP_PREFIX_RT_*
1015 * constants.
1016 *
1017 * 1) we don't purge prefix if address was not permanent.
1018 * prefix is managed by its own lifetime.
1019 * 2) we also don't purge, if the address was IFA_F_NOPREFIXROUTE.
1020 * 3) if there are no addresses, delete prefix.
1021 * 4) if there are still other permanent address(es),
1022 * corresponding prefix is still permanent.
1023 * 5) if there are still other addresses with IFA_F_NOPREFIXROUTE,
1024 * don't purge the prefix, assume user space is managing it.
1025 * 6) otherwise, update prefix lifetime to the
1026 * longest valid lifetime among the corresponding
1027 * addresses on the device.
1028 * Note: subsequent RA will update lifetime.
1029 **/
1030static enum cleanup_prefix_rt_t
1031check_cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long *expires)
1032{
1033 struct inet6_ifaddr *ifa;
1034 struct inet6_dev *idev = ifp->idev;
1035 unsigned long lifetime;
1036 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_DEL;
1037
1038 *expires = jiffies;
1039
1040 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1041 if (ifa == ifp)
1042 continue;
1043 if (!ipv6_prefix_equal(&ifa->addr, &ifp->addr,
1044 ifp->prefix_len))
1045 continue;
1046 if (ifa->flags & (IFA_F_PERMANENT | IFA_F_NOPREFIXROUTE))
1047 return CLEANUP_PREFIX_RT_NOP;
1048
1049 action = CLEANUP_PREFIX_RT_EXPIRE;
1050
1051 spin_lock(&ifa->lock);
1052
1053 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
1054 /*
1055 * Note: Because this address is
1056 * not permanent, lifetime <
1057 * LONG_MAX / HZ here.
1058 */
1059 if (time_before(*expires, ifa->tstamp + lifetime * HZ))
1060 *expires = ifa->tstamp + lifetime * HZ;
1061 spin_unlock(&ifa->lock);
1062 }
1063
1064 return action;
1065}
1066
1067static void
1068cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long expires, bool del_rt)
1069{
1070 struct rt6_info *rt;
1071
1072 rt = addrconf_get_prefix_route(&ifp->addr,
1073 ifp->prefix_len,
1074 ifp->idev->dev,
1075 0, RTF_GATEWAY | RTF_DEFAULT);
1076 if (rt) {
1077 if (del_rt)
1078 ip6_del_rt(rt);
1079 else {
1080 if (!(rt->rt6i_flags & RTF_EXPIRES))
1081 rt6_set_expires(rt, expires);
1082 ip6_rt_put(rt);
1083 }
1084 }
1085}
1086
1087
1da177e4
LT		 1088/* This function wants to get referenced ifp and releases it before return */
1089
1090static void ipv6_del_addr(struct inet6_ifaddr *ifp)
1091{
4c5ff6a6 1092 int state;
5b84efec
TH		 1093 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_NOP;
1094 unsigned long expires;
1da177e4 1095
c15b1cca
HFS		 1096 ASSERT_RTNL();
1097
8e8e676d 1098 spin_lock_bh(&ifp->lock);
4c5ff6a6 1099 state = ifp->state;
e9d3e084 1100 ifp->state = INET6_IFADDR_STATE_DEAD;
8e8e676d 1101 spin_unlock_bh(&ifp->lock);
4c5ff6a6
HX		 1102
1103 if (state == INET6_IFADDR_STATE_DEAD)
1104 goto out;
1da177e4 1105
5c578aed 1106 spin_lock_bh(&addrconf_hash_lock);
1107 hlist_del_init_rcu(&ifp->addr_lst);
5c578aed 1108 spin_unlock_bh(&addrconf_hash_lock);
1da177e4 1109
5b84efec 1110 write_lock_bh(&ifp->idev->lock);
5d9efa7e 1111
1da177e4 1112 if (ifp->flags&IFA_F_TEMPORARY) {
372e6c8f 1113 list_del(&ifp->tmp_list);
1114 if (ifp->ifpub) {
1115 in6_ifa_put(ifp->ifpub);
1116 ifp->ifpub = NULL;
1da177e4 1117 }
372e6c8f 1118 __in6_ifa_put(ifp);
1da177e4 1119 }
1da177e4 1120
5b84efec
TH		 1121 if (ifp->flags & IFA_F_PERMANENT && !(ifp->flags & IFA_F_NOPREFIXROUTE))
1122 action = check_cleanup_prefix_route(ifp, &expires);
502a2ffd 1123
5b84efec
TH		 1124 list_del_init(&ifp->if_list);
1125 __in6_ifa_put(ifp);
1126
1127 write_unlock_bh(&ifp->idev->lock);
1da177e4 1128
c15b1cca 1129 addrconf_del_dad_work(ifp);
b2238566 1130
1da177e4
LT		 1131 ipv6_ifa_notify(RTM_DELADDR, ifp);
1132
f88c91dd 1133 inet6addr_notifier_call_chain(NETDEV_DOWN, ifp);
1da177e4 1134
5b84efec
TH		 1135 if (action != CLEANUP_PREFIX_RT_NOP) {
1136 cleanup_prefix_route(ifp, expires,
1137 action == CLEANUP_PREFIX_RT_DEL);
1da177e4
LT		 1138 }
1139
c3968a85
DW		 1140 /* clean up prefsrc entries */
1141 rt6_remove_prefsrc(ifp);
4c5ff6a6 1142out:
1da177e4
LT		 1143 in6_ifa_put(ifp);
1144}
1145
1da177e4
LT		 1146static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
1147{
1148 struct inet6_dev *idev = ifp->idev;
1149 struct in6_addr addr, *tmpaddr;
76f793e3 1150 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_tstamp, age;
eac55bf9 1151 unsigned long regen_advance;
1da177e4
LT		 1152 int tmp_plen;
1153 int ret = 0;
95c385b4 1154 u32 addr_flags;
76f793e3 1155 unsigned long now = jiffies;
1da177e4 1156
53bd6749 1157 write_lock_bh(&idev->lock);
1da177e4
LT		 1158 if (ift) {
1159 spin_lock_bh(&ift->lock);
1160 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
1161 spin_unlock_bh(&ift->lock);
1162 tmpaddr = &addr;
1163 } else {
1164 tmpaddr = NULL;
1165 }
1166retry:
1167 in6_dev_hold(idev);
1168 if (idev->cnf.use_tempaddr <= 0) {
53bd6749 1169 write_unlock_bh(&idev->lock);
f3213831 1170 pr_info("%s: use_tempaddr is disabled\n", __func__);
1da177e4
LT		 1171 in6_dev_put(idev);
1172 ret = -1;
1173 goto out;
1174 }
1175 spin_lock_bh(&ifp->lock);
1176 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
1177 idev->cnf.use_tempaddr = -1; /*XXX*/
1178 spin_unlock_bh(&ifp->lock);
53bd6749 1179 write_unlock_bh(&idev->lock);
f3213831
JP		 1180 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n",
1181 __func__);
1da177e4
LT		 1182 in6_dev_put(idev);
1183 ret = -1;
1184 goto out;
1185 }
1186 in6_ifa_hold(ifp);
1187 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
eb7e0575 1188 __ipv6_try_regen_rndid(idev, tmpaddr);
1da177e4 1189 memcpy(&addr.s6_addr[8], idev->rndid, 8);
76f793e3 1190 age = (now - ifp->tstamp) / HZ;
1da177e4
LT		 1191 tmp_valid_lft = min_t(__u32,
1192 ifp->valid_lft,
7a876b0e 1193 idev->cnf.temp_valid_lft + age);
1ab1457c
YH		 1194 tmp_prefered_lft = min_t(__u32,
1195 ifp->prefered_lft,
7a876b0e 1196 idev->cnf.temp_prefered_lft + age -
784e2710 1197 idev->cnf.max_desync_factor);
1da177e4 1198 tmp_plen = ifp->prefix_len;
1da177e4
LT		 1199 tmp_tstamp = ifp->tstamp;
1200 spin_unlock_bh(&ifp->lock);
1201
eac55bf9 1202 regen_advance = idev->cnf.regen_max_retry *
67ba4152
IM		 1203 idev->cnf.dad_transmits *
1204 NEIGH_VAR(idev->nd_parms, RETRANS_TIME) / HZ;
53bd6749 1205 write_unlock_bh(&idev->lock);
95c385b4 1206
eac55bf9
BB		 1207 /* A temporary address is created only if this calculated Preferred
1208 * Lifetime is greater than REGEN_ADVANCE time units. In particular,
1209 * an implementation must not create a temporary address with a zero
1210 * Preferred Lifetime.
ecab6701
HK		 1211 * Use age calculation as in addrconf_verify to avoid unnecessary
1212 * temporary addresses being generated.
eac55bf9 1213 */
ecab6701
HK		 1214 age = (now - tmp_tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
1215 if (tmp_prefered_lft <= regen_advance + age) {
eac55bf9
BB		 1216 in6_ifa_put(ifp);
1217 in6_dev_put(idev);
1218 ret = -1;
1219 goto out;
1220 }
1221
95c385b4
NH		 1222 addr_flags = IFA_F_TEMPORARY;
1223 /* set in addrconf_prefix_rcv() */
1224 if (ifp->flags & IFA_F_OPTIMISTIC)
1225 addr_flags |= IFA_F_OPTIMISTIC;
1226
4b08a8f1
HFS		 1227 ift = ipv6_add_addr(idev, &addr, NULL, tmp_plen,
1228 ipv6_addr_scope(&addr), addr_flags,
1229 tmp_valid_lft, tmp_prefered_lft);
1230 if (IS_ERR(ift)) {
1da177e4
LT		 1231 in6_ifa_put(ifp);
1232 in6_dev_put(idev);
f3213831 1233 pr_info("%s: retry temporary address regeneration\n", __func__);
1da177e4 1234 tmpaddr = &addr;
53bd6749 1235 write_lock_bh(&idev->lock);
1da177e4
LT		 1236 goto retry;
1237 }
1238
1239 spin_lock_bh(&ift->lock);
1240 ift->ifpub = ifp;
76f793e3 1241 ift->cstamp = now;
1da177e4
LT		 1242 ift->tstamp = tmp_tstamp;
1243 spin_unlock_bh(&ift->lock);
1244
cf22f9a2 1245 addrconf_dad_start(ift);
1da177e4
LT		 1246 in6_ifa_put(ift);
1247 in6_dev_put(idev);
1248out:
1249 return ret;
1250}
1da177e4
LT		 1251
1252/*
072047e4 1253 * Choose an appropriate source address (RFC3484)
1da177e4 1254 */
a9b05723
YH		 1255enum {
1256 IPV6_SADDR_RULE_INIT = 0,
1257 IPV6_SADDR_RULE_LOCAL,
1258 IPV6_SADDR_RULE_SCOPE,
1259 IPV6_SADDR_RULE_PREFERRED,
1260#ifdef CONFIG_IPV6_MIP6
1261 IPV6_SADDR_RULE_HOA,
1262#endif
1263 IPV6_SADDR_RULE_OIF,
1264 IPV6_SADDR_RULE_LABEL,
a9b05723 1265 IPV6_SADDR_RULE_PRIVACY,
a9b05723
YH		 1266 IPV6_SADDR_RULE_ORCHID,
1267 IPV6_SADDR_RULE_PREFIX,
7fd2561e
EK		 1268#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1269 IPV6_SADDR_RULE_NOT_OPTIMISTIC,
1270#endif
a9b05723
YH		 1271 IPV6_SADDR_RULE_MAX
1272};
1273
072047e4 1274struct ipv6_saddr_score {
a9b05723
YH		 1275 int rule;
1276 int addr_type;
1277 struct inet6_ifaddr *ifa;
1278 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
1279 int scopedist;
1280 int matchlen;
072047e4
YH		 1281};
1282
a9b05723 1283struct ipv6_saddr_dst {
9acd9f3a 1284 const struct in6_addr *addr;
a9b05723
YH		 1285 int ifindex;
1286 int scope;
1287 int label;
7cbca67c 1288 unsigned int prefs;
a9b05723 1289};
072047e4 1290
b6f99a21 1291static inline int ipv6_saddr_preferred(int type)
1da177e4 1292{
45bb0060 1293 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
072047e4
YH		 1294 return 1;
1295 return 0;
1da177e4
LT		 1296}
1297
7fd2561e
EK		 1298static inline bool ipv6_use_optimistic_addr(struct inet6_dev *idev)
1299{
1300#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1301 return idev && idev->cnf.optimistic_dad && idev->cnf.use_optimistic;
1302#else
1303 return false;
1304#endif
1305}
1306
3de23255
BT		 1307static int ipv6_get_saddr_eval(struct net *net,
1308 struct ipv6_saddr_score *score,
a9b05723
YH		 1309 struct ipv6_saddr_dst *dst,
1310 int i)
1311{
1312 int ret;
1313
1314 if (i <= score->rule) {
1315 switch (i) {
1316 case IPV6_SADDR_RULE_SCOPE:
1317 ret = score->scopedist;
1318 break;
1319 case IPV6_SADDR_RULE_PREFIX:
1320 ret = score->matchlen;
1321 break;
1322 default:
1323 ret = !!test_bit(i, score->scorebits);
1324 }
1325 goto out;
1326 }
1327
1328 switch (i) {
1329 case IPV6_SADDR_RULE_INIT:
1330 /* Rule 0: remember if hiscore is not ready yet */
1331 ret = !!score->ifa;
1332 break;
1333 case IPV6_SADDR_RULE_LOCAL:
1334 /* Rule 1: Prefer same address */
1335 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1336 break;
1337 case IPV6_SADDR_RULE_SCOPE:
1338 /* Rule 2: Prefer appropriate scope
1339 *
1340 * ret
1341 * ^
1342 * -1 | d 15
1343 * ---+--+-+---> scope
1344 * |
1345 * | d is scope of the destination.
1346 * B-d | \
1347 * | \ <- smaller scope is better if
db9c7c39 1348 * B-15 | \ if scope is enough for destination.
a9b05723
YH		 1349 * | ret = B - scope (-1 <= scope >= d <= 15).
1350 * d-C-1 | /
1351 * |/ <- greater is better
1352 * -C / if scope is not enough for destination.
1353 * /| ret = scope - C (-1 <= d < scope <= 15).
1354 *
1355 * d - C - 1 < B -15 (for all -1 <= d <= 15).
1356 * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1357 * Assume B = 0 and we get C > 29.
1358 */
1359 ret = __ipv6_addr_src_scope(score->addr_type);
1360 if (ret >= dst->scope)
1361 ret = -ret;
1362 else
1363 ret -= 128; /* 30 is enough */
1364 score->scopedist = ret;
1365 break;
1366 case IPV6_SADDR_RULE_PREFERRED:
7fd2561e 1367 {
a9b05723 1368 /* Rule 3: Avoid deprecated and optimistic addresses */
7fd2561e
EK		 1369 u8 avoid = IFA_F_DEPRECATED;
1370
1371 if (!ipv6_use_optimistic_addr(score->ifa->idev))
1372 avoid |= IFA_F_OPTIMISTIC;
a9b05723 1373 ret = ipv6_saddr_preferred(score->addr_type) ||
7fd2561e 1374 !(score->ifa->flags & avoid);
a9b05723 1375 break;
7fd2561e 1376 }
a9b05723
YH		 1377#ifdef CONFIG_IPV6_MIP6
1378 case IPV6_SADDR_RULE_HOA:
7cbca67c 1379 {
a9b05723 1380 /* Rule 4: Prefer home address */
7cbca67c
YH		 1381 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1382 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
a9b05723 1383 break;
7cbca67c 1384 }
a9b05723
YH		 1385#endif
1386 case IPV6_SADDR_RULE_OIF:
1387 /* Rule 5: Prefer outgoing interface */
1388 ret = (!dst->ifindex ||
1389 dst->ifindex == score->ifa->idev->dev->ifindex);
1390 break;
1391 case IPV6_SADDR_RULE_LABEL:
1392 /* Rule 6: Prefer matching label */
3de23255
BT		 1393 ret = ipv6_addr_label(net,
1394 &score->ifa->addr, score->addr_type,
a9b05723
YH		 1395 score->ifa->idev->dev->ifindex) == dst->label;
1396 break;
a9b05723 1397 case IPV6_SADDR_RULE_PRIVACY:
7cbca67c 1398 {
a9b05723 1399 /* Rule 7: Prefer public address
25985edc 1400 * Note: prefer temporary address if use_tempaddr >= 2
a9b05723 1401 */
7cbca67c
YH		 1402 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1403 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1404 score->ifa->idev->cnf.use_tempaddr >= 2;
1405 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
a9b05723 1406 break;
7cbca67c 1407 }
a9b05723
YH		 1408 case IPV6_SADDR_RULE_ORCHID:
1409 /* Rule 8-: Prefer ORCHID vs ORCHID or
1410 * non-ORCHID vs non-ORCHID
1411 */
1412 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1413 ipv6_addr_orchid(dst->addr));
1414 break;
1415 case IPV6_SADDR_RULE_PREFIX:
1416 /* Rule 8: Use longest matching prefix */
91b4b04f
YH		 1417 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr);
1418 if (ret > score->ifa->prefix_len)
1419 ret = score->ifa->prefix_len;
1420 score->matchlen = ret;
a9b05723 1421 break;
7fd2561e
EK		 1422#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1423 case IPV6_SADDR_RULE_NOT_OPTIMISTIC:
1424 /* Optimistic addresses still have lower precedence than other
1425 * preferred addresses.
1426 */
1427 ret = !(score->ifa->flags & IFA_F_OPTIMISTIC);
1428 break;
1429#endif
a9b05723
YH		 1430 default:
1431 ret = 0;
1432 }
1433
1434 if (ret)
1435 __set_bit(i, score->scorebits);
1436 score->rule = i;
1437out:
1438 return ret;
1439}
1440
c0b8da1e
YH		 1441static int __ipv6_dev_get_saddr(struct net *net,
1442 struct ipv6_saddr_dst *dst,
c0b8da1e
YH		 1443 struct inet6_dev *idev,
1444 struct ipv6_saddr_score *scores,
1445 int hiscore_idx)
9131f3de 1446{
c0b8da1e 1447 struct ipv6_saddr_score *score = &scores[1 - hiscore_idx], *hiscore = &scores[hiscore_idx];
9131f3de
YH		 1448
1449 read_lock_bh(&idev->lock);
1450 list_for_each_entry(score->ifa, &idev->addr_list, if_list) {
1451 int i;
1452
1453 /*
1454 * - Tentative Address (RFC2462 section 5.4)
1455 * - A tentative address is not considered
1456 * "assigned to an interface" in the traditional
1457 * sense, unless it is also flagged as optimistic.
1458 * - Candidate Source Address (section 4)
1459 * - In any case, anycast addresses, multicast
1460 * addresses, and the unspecified address MUST
1461 * NOT be included in a candidate set.
1462 */
1463 if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1464 (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
1465 continue;
1466
1467 score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1468
1469 if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1470 score->addr_type & IPV6_ADDR_MULTICAST)) {
1471 net_dbg_ratelimited("ADDRCONF: unspecified / multicast address assigned as unicast address on %s",
1472 idev->dev->name);
1473 continue;
1474 }
1475
1476 score->rule = -1;
1477 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1478
1479 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1480 int minihiscore, miniscore;
1481
1482 minihiscore = ipv6_get_saddr_eval(net, hiscore, dst, i);
1483 miniscore = ipv6_get_saddr_eval(net, score, dst, i);
1484
1485 if (minihiscore > miniscore) {
1486 if (i == IPV6_SADDR_RULE_SCOPE &&
1487 score->scopedist > 0) {
1488 /*
1489 * special case:
1490 * each remaining entry
1491 * has too small (not enough)
1492 * scope, because ifa entries
1493 * are sorted by their scope
1494 * values.
1495 */
1496 goto out;
1497 }
1498 break;
1499 } else if (minihiscore < miniscore) {
1500 if (hiscore->ifa)
1501 in6_ifa_put(hiscore->ifa);
1502
1503 in6_ifa_hold(score->ifa);
1504
1505 swap(hiscore, score);
c0b8da1e 1506 hiscore_idx = 1 - hiscore_idx;
9131f3de
YH		 1507
1508 /* restore our iterator */
1509 score->ifa = hiscore->ifa;
1510
1511 break;
1512 }
1513 }
1514 }
1515out:
1516 read_unlock_bh(&idev->lock);
c0b8da1e 1517 return hiscore_idx;
9131f3de
YH		 1518}
1519
b3f644fc 1520int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev,
9acd9f3a 1521 const struct in6_addr *daddr, unsigned int prefs,
7cbca67c 1522 struct in6_addr *saddr)
1da177e4 1523{
c0b8da1e 1524 struct ipv6_saddr_score scores[2], *hiscore;
a9b05723 1525 struct ipv6_saddr_dst dst;
9131f3de 1526 struct inet6_dev *idev;
072047e4 1527 struct net_device *dev;
a9b05723 1528 int dst_type;
9131f3de 1529 bool use_oif_addr = false;
c0b8da1e 1530 int hiscore_idx = 0;
1da177e4 1531
a9b05723
YH		 1532 dst_type = __ipv6_addr_type(daddr);
1533 dst.addr = daddr;
1534 dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1535 dst.scope = __ipv6_addr_src_scope(dst_type);
3de23255 1536 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
7cbca67c 1537 dst.prefs = prefs;
a9b05723 1538
c0b8da1e
YH		 1539 scores[hiscore_idx].rule = -1;
1540 scores[hiscore_idx].ifa = NULL;
1da177e4 1541
8814c4b5 1542 rcu_read_lock();
1da177e4 1543
9131f3de
YH		 1544 /* Candidate Source Address (section 4)
1545 * - multicast and link-local destination address,
1546 * the set of candidate source address MUST only
1547 * include addresses assigned to interfaces
1548 * belonging to the same link as the outgoing
1549 * interface.
1550 * (- For site-local destination addresses, the
1551 * set of candidate source addresses MUST only
1552 * include addresses assigned to interfaces
1553 * belonging to the same site as the outgoing
1554 * interface.)
3985e8a3
EK		 1555 * - "It is RECOMMENDED that the candidate source addresses
1556 * be the set of unicast addresses assigned to the
1557 * interface that will be used to send to the destination
1558 * (the 'outgoing' interface)." (RFC 6724)
9131f3de
YH		 1559 */
1560 if (dst_dev) {
3985e8a3 1561 idev = __in6_dev_get(dst_dev);
9131f3de 1562 if ((dst_type & IPV6_ADDR_MULTICAST) ||
3985e8a3
EK		 1563 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL ||
1564 (idev && idev->cnf.use_oif_addrs_only)) {
9131f3de
YH		 1565 use_oif_addr = true;
1566 }
1567 }
a9b05723 1568
9131f3de 1569 if (use_oif_addr) {
c0b8da1e 1570 if (idev)
c15df306 1571 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx);
9131f3de
YH		 1572 } else {
1573 for_each_netdev_rcu(net, dev) {
1574 idev = __in6_dev_get(dev);
1575 if (!idev)
072047e4 1576 continue;
c15df306 1577 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx);
1da177e4
LT		 1578 }
1579 }
8814c4b5 1580 rcu_read_unlock();
1da177e4 1581
c0b8da1e 1582 hiscore = &scores[hiscore_idx];
a9b05723 1583 if (!hiscore->ifa)
072047e4 1584 return -EADDRNOTAVAIL;
1ab1457c 1585
4e3fd7a0 1586 *saddr = hiscore->ifa->addr;
a9b05723 1587 in6_ifa_put(hiscore->ifa);
072047e4 1588 return 0;
1da177e4 1589}
5e5f3f0f 1590EXPORT_SYMBOL(ipv6_dev_get_saddr);
1da177e4 1591
8965779d 1592int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr,
479840ff 1593 u32 banned_flags)
b7b1bfce
HFS		 1594{
1595 struct inet6_ifaddr *ifp;
1596 int err = -EADDRNOTAVAIL;
1597
602582ca
HFS		 1598 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
1599 if (ifp->scope > IFA_LINK)
1600 break;
b7b1bfce
HFS		 1601 if (ifp->scope == IFA_LINK &&
1602 !(ifp->flags & banned_flags)) {
1603 *addr = ifp->addr;
1604 err = 0;
1605 break;
1606 }
1607 }
1608 return err;
1609}
1610
95c385b4 1611int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
479840ff 1612 u32 banned_flags)
1da177e4
LT		 1613{
1614 struct inet6_dev *idev;
1615 int err = -EADDRNOTAVAIL;
1616
8814c4b5 1617 rcu_read_lock();
e21e8467
SH		 1618 idev = __in6_dev_get(dev);
1619 if (idev) {
1da177e4 1620 read_lock_bh(&idev->lock);
b7b1bfce 1621 err = __ipv6_get_lladdr(idev, addr, banned_flags);
1da177e4
LT		 1622 read_unlock_bh(&idev->lock);
1623 }
8814c4b5 1624 rcu_read_unlock();
1da177e4
LT		 1625 return err;
1626}
1627
1628static int ipv6_count_addresses(struct inet6_dev *idev)
1629{
1630 int cnt = 0;
1631 struct inet6_ifaddr *ifp;
1632
1633 read_lock_bh(&idev->lock);
502a2ffd 1634 list_for_each_entry(ifp, &idev->addr_list, if_list)
1da177e4
LT		 1635 cnt++;
1636 read_unlock_bh(&idev->lock);
1637 return cnt;
1638}
1639
b71d1d42 1640int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
2a7851bf 1641 const struct net_device *dev, int strict)
c58da4c6
EK		 1642{
1643 return ipv6_chk_addr_and_flags(net, addr, dev, strict, IFA_F_TENTATIVE);
1644}
1645EXPORT_SYMBOL(ipv6_chk_addr);
1646
1647int ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr,
1648 const struct net_device *dev, int strict,
1649 u32 banned_flags)
1da177e4 1650{
eedf042a 1651 struct inet6_ifaddr *ifp;
ddbe5032 1652 unsigned int hash = inet6_addr_hash(addr);
c58da4c6 1653 u32 ifp_flags;
1da177e4 1654
5c578aed 1655 rcu_read_lock_bh();
b67bfe0d 1656 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
878628fb 1657 if (!net_eq(dev_net(ifp->idev->dev), net))
bfeade08 1658 continue;
c58da4c6
EK		 1659 /* Decouple optimistic from tentative for evaluation here.
1660 * Ban optimistic addresses explicitly, when required.
1661 */
1662 ifp_flags = (ifp->flags&IFA_F_OPTIMISTIC)
1663 ? (ifp->flags&~IFA_F_TENTATIVE)
1664 : ifp->flags;
1da177e4 1665 if (ipv6_addr_equal(&ifp->addr, addr) &&
c58da4c6 1666 !(ifp_flags&banned_flags) &&
63159f29 1667 (!dev || ifp->idev->dev == dev ||
eedf042a
SH		 1668 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) {
1669 rcu_read_unlock_bh();
1670 return 1;
1da177e4
LT		 1671 }
1672 }
5c578aed 1673
eedf042a
SH		 1674 rcu_read_unlock_bh();
1675 return 0;
1da177e4 1676}
c58da4c6 1677EXPORT_SYMBOL(ipv6_chk_addr_and_flags);
7159039a 1678
3e81c6da
DM		 1679static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1680 struct net_device *dev)
1da177e4 1681{
ddbe5032 1682 unsigned int hash = inet6_addr_hash(addr);
c2e21293 1683 struct inet6_ifaddr *ifp;
1da177e4 1684
b67bfe0d 1685 hlist_for_each_entry(ifp, &inet6_addr_lst[hash], addr_lst) {
878628fb 1686 if (!net_eq(dev_net(ifp->idev->dev), net))
06bfe655 1687 continue;
1da177e4 1688 if (ipv6_addr_equal(&ifp->addr, addr)) {
63159f29 1689 if (!dev || ifp->idev->dev == dev)
3e81c6da 1690 return true;
1da177e4
LT		 1691 }
1692 }
3e81c6da 1693 return false;
1da177e4
LT		 1694}
1695
7df37ff3
CB		 1696/* Compares an address/prefix_len with addresses on device @dev.
1697 * If one is found it returns true.
1698 */
1699bool ipv6_chk_custom_prefix(const struct in6_addr *addr,
1700 const unsigned int prefix_len, struct net_device *dev)
1701{
1702 struct inet6_dev *idev;
1703 struct inet6_ifaddr *ifa;
1704 bool ret = false;
1705
1706 rcu_read_lock();
1707 idev = __in6_dev_get(dev);
1708 if (idev) {
1709 read_lock_bh(&idev->lock);
1710 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1711 ret = ipv6_prefix_equal(addr, &ifa->addr, prefix_len);
1712 if (ret)
1713 break;
1714 }
1715 read_unlock_bh(&idev->lock);
1716 }
1717 rcu_read_unlock();
1718
1719 return ret;
1720}
1721EXPORT_SYMBOL(ipv6_chk_custom_prefix);
1722
b71d1d42 1723int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev)
52eeeb84
YH		 1724{
1725 struct inet6_dev *idev;
1726 struct inet6_ifaddr *ifa;
1727 int onlink;
1728
1729 onlink = 0;
1730 rcu_read_lock();
1731 idev = __in6_dev_get(dev);
1732 if (idev) {
1733 read_lock_bh(&idev->lock);
502a2ffd 1734 list_for_each_entry(ifa, &idev->addr_list, if_list) {
52eeeb84
YH		 1735 onlink = ipv6_prefix_equal(addr, &ifa->addr,
1736 ifa->prefix_len);
1737 if (onlink)
1738 break;
1739 }
1740 read_unlock_bh(&idev->lock);
1741 }
1742 rcu_read_unlock();
1743 return onlink;
1744}
52eeeb84
YH		 1745EXPORT_SYMBOL(ipv6_chk_prefix);
1746
9acd9f3a 1747struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1cab3da6 1748 struct net_device *dev, int strict)
1da177e4 1749{
b79d1d54 1750 struct inet6_ifaddr *ifp, *result = NULL;
ddbe5032 1751 unsigned int hash = inet6_addr_hash(addr);
1da177e4 1752
5c578aed 1753 rcu_read_lock_bh();
b67bfe0d 1754 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
878628fb 1755 if (!net_eq(dev_net(ifp->idev->dev), net))
1cab3da6 1756 continue;
1da177e4 1757 if (ipv6_addr_equal(&ifp->addr, addr)) {
63159f29 1758 if (!dev || ifp->idev->dev == dev ||
1da177e4 1759 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
b79d1d54 1760 result = ifp;
1da177e4
LT		 1761 in6_ifa_hold(ifp);
1762 break;
1763 }
1764 }
1765 }
5c578aed 1766 rcu_read_unlock_bh();
1da177e4 1767
b79d1d54 1768 return result;
1da177e4
LT		 1769}
1770
1da177e4
LT		 1771/* Gets referenced address, destroys ifaddr */
1772
cc411d0b 1773static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
1da177e4 1774{
3d171f39
LR		 1775 if (dad_failed)
1776 ifp->flags |= IFA_F_DADFAILED;
1777
1da177e4
LT		 1778 if (ifp->flags&IFA_F_PERMANENT) {
1779 spin_lock_bh(&ifp->lock);
c15b1cca 1780 addrconf_del_dad_work(ifp);
1da177e4
LT		 1781 ifp->flags |= IFA_F_TENTATIVE;
1782 spin_unlock_bh(&ifp->lock);
e2577a06
HX		 1783 if (dad_failed)
1784 ipv6_ifa_notify(0, ifp);
1da177e4 1785 in6_ifa_put(ifp);
1da177e4
LT		 1786 } else if (ifp->flags&IFA_F_TEMPORARY) {
1787 struct inet6_ifaddr *ifpub;
1788 spin_lock_bh(&ifp->lock);
1789 ifpub = ifp->ifpub;
1790 if (ifpub) {
1791 in6_ifa_hold(ifpub);
1792 spin_unlock_bh(&ifp->lock);
1793 ipv6_create_tempaddr(ifpub, ifp);
1794 in6_ifa_put(ifpub);
1795 } else {
1796 spin_unlock_bh(&ifp->lock);
1797 }
1798 ipv6_del_addr(ifp);
c15b1cca 1799 } else {
1da177e4 1800 ipv6_del_addr(ifp);
c15b1cca 1801 }
1da177e4
LT		 1802}
1803
f2344a13
HX		 1804static int addrconf_dad_end(struct inet6_ifaddr *ifp)
1805{
1806 int err = -ENOENT;
1807
8e8e676d 1808 spin_lock_bh(&ifp->lock);
f2344a13
HX		 1809 if (ifp->state == INET6_IFADDR_STATE_DAD) {
1810 ifp->state = INET6_IFADDR_STATE_POSTDAD;
1811 err = 0;
1812 }
8e8e676d 1813 spin_unlock_bh(&ifp->lock);
f2344a13
HX		 1814
1815 return err;
1816}
1817
3c21edbd
YH		 1818void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1819{
5f40ef77 1820 struct in6_addr addr;
1b34be74 1821 struct inet6_dev *idev = ifp->idev;
1855b7c3 1822 struct net *net = dev_net(ifp->idev->dev);
9bdd8d40 1823
853dc2e0
UB		 1824 if (addrconf_dad_end(ifp)) {
1825 in6_ifa_put(ifp);
f2344a13 1826 return;
853dc2e0 1827 }
f2344a13 1828
e87cc472
JP		 1829 net_info_ratelimited("%s: IPv6 duplicate address %pI6c detected!\n",
1830 ifp->idev->dev->name, &ifp->addr);
9bdd8d40 1831
5f40ef77
HFS		 1832 spin_lock_bh(&ifp->lock);
1833
1834 if (ifp->flags & IFA_F_STABLE_PRIVACY) {
1835 int scope = ifp->scope;
1836 u32 flags = ifp->flags;
1837 struct in6_addr new_addr;
1838 struct inet6_ifaddr *ifp2;
1839 u32 valid_lft, preferred_lft;
1840 int pfxlen = ifp->prefix_len;
5f40ef77
HFS		 1841 int retries = ifp->stable_privacy_retry + 1;
1842
1855b7c3 1843 if (retries > net->ipv6.sysctl.idgen_retries) {
5f40ef77
HFS		 1844 net_info_ratelimited("%s: privacy stable address generation failed because of DAD conflicts!\n",
1845 ifp->idev->dev->name);
1846 goto errdad;
1847 }
1848
1849 new_addr = ifp->addr;
1850 if (ipv6_generate_stable_address(&new_addr, retries,
1851 idev))
1852 goto errdad;
1853
1854 valid_lft = ifp->valid_lft;
1855 preferred_lft = ifp->prefered_lft;
1856
1857 spin_unlock_bh(&ifp->lock);
1b34be74 1858
5f40ef77
HFS		 1859 if (idev->cnf.max_addresses &&
1860 ipv6_count_addresses(idev) >=
1861 idev->cnf.max_addresses)
1862 goto lock_errdad;
1863
1864 net_info_ratelimited("%s: generating new stable privacy address because of DAD conflict\n",
1865 ifp->idev->dev->name);
1866
1867 ifp2 = ipv6_add_addr(idev, &new_addr, NULL, pfxlen,
1868 scope, flags, valid_lft,
1869 preferred_lft);
1870 if (IS_ERR(ifp2))
1871 goto lock_errdad;
1872
1873 spin_lock_bh(&ifp2->lock);
1874 ifp2->stable_privacy_retry = retries;
1875 ifp2->state = INET6_IFADDR_STATE_PREDAD;
1876 spin_unlock_bh(&ifp2->lock);
1877
1855b7c3 1878 addrconf_mod_dad_work(ifp2, net->ipv6.sysctl.idgen_delay);
5f40ef77
HFS		 1879 in6_ifa_put(ifp2);
1880lock_errdad:
1881 spin_lock_bh(&ifp->lock);
1882 } else if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6) {
1b34be74
YH		 1883 addr.s6_addr32[0] = htonl(0xfe800000);
1884 addr.s6_addr32[1] = 0;
1885
1886 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
1887 ipv6_addr_equal(&ifp->addr, &addr)) {
1888 /* DAD failed for link-local based on MAC address */
1889 idev->cnf.disable_ipv6 = 1;
9bdd8d40 1890
f3213831 1891 pr_info("%s: IPv6 being disabled!\n",
9bdd8d40 1892 ifp->idev->dev->name);
1b34be74
YH		 1893 }
1894 }
1895
5f40ef77 1896errdad:
c15b1cca
HFS		 1897 /* transition from _POSTDAD to _ERRDAD */
1898 ifp->state = INET6_IFADDR_STATE_ERRDAD;
8e8e676d 1899 spin_unlock_bh(&ifp->lock);
c15b1cca
HFS		 1900
1901 addrconf_mod_dad_work(ifp, 0);
3c21edbd 1902}
1da177e4 1903
a9ed4a29
SD		 1904/* Join to solicited addr multicast group.
1905 * caller must hold RTNL */
b71d1d42 1906void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr)
1da177e4
LT		 1907{
1908 struct in6_addr maddr;
1909
1910 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1911 return;
1912
1913 addrconf_addr_solict_mult(addr, &maddr);
1914 ipv6_dev_mc_inc(dev, &maddr);
1915}
1916
a9ed4a29 1917/* caller must hold RTNL */
b71d1d42 1918void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr)
1da177e4
LT		 1919{
1920 struct in6_addr maddr;
1921
1922 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1923 return;
1924
1925 addrconf_addr_solict_mult(addr, &maddr);
1926 __ipv6_dev_mc_dec(idev, &maddr);
1927}
1928
a9ed4a29 1929/* caller must hold RTNL */
20380731 1930static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1da177e4
LT		 1931{
1932 struct in6_addr addr;
c15b1cca 1933
88ad3149 1934 if (ifp->prefix_len >= 127) /* RFC 6164 */
2bda8a0c 1935 return;
1da177e4
LT		 1936 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1937 if (ipv6_addr_any(&addr))
1938 return;
013b4d90 1939 __ipv6_dev_ac_inc(ifp->idev, &addr);
1da177e4
LT		 1940}
1941
a9ed4a29 1942/* caller must hold RTNL */
20380731 1943static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1da177e4
LT		 1944{
1945 struct in6_addr addr;
c15b1cca 1946
88ad3149 1947 if (ifp->prefix_len >= 127) /* RFC 6164 */
32019e65 1948 return;
1da177e4
LT		 1949 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1950 if (ipv6_addr_any(&addr))
1951 return;
1952 __ipv6_dev_ac_dec(ifp->idev, &addr);
1953}
1954
06a4c1c5 1955static int addrconf_ifid_eui64(u8 *eui, struct net_device *dev)
1956{
5241c2d7 1957 if (dev->addr_len != EUI64_ADDR_LEN)
06a4c1c5 1958 return -1;
5241c2d7 1959 memcpy(eui, dev->dev_addr, EUI64_ADDR_LEN);
5e98a36e 1960 eui[0] ^= 2;
06a4c1c5 1961 return 0;
1962}
1963
cb6bf355
YH		 1964static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev)
1965{
1966 union fwnet_hwaddr *ha;
1967
1968 if (dev->addr_len != FWNET_ALEN)
1969 return -1;
1970
1971 ha = (union fwnet_hwaddr *)dev->dev_addr;
1972
1973 memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id));
1974 eui[0] ^= 2;
1975 return 0;
1976}
1977
073a8e0e
YH		 1978static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1979{
1980 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1981 if (dev->addr_len != ARCNET_ALEN)
1982 return -1;
1983 memset(eui, 0, 7);
8e5e8f30 1984 eui[7] = *(u8 *)dev->dev_addr;
073a8e0e
YH		 1985 return 0;
1986}
1987
1988static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1989{
1990 if (dev->addr_len != INFINIBAND_ALEN)
1991 return -1;
1992 memcpy(eui, dev->dev_addr + 12, 8);
1993 eui[0] |= 2;
1994 return 0;
1995}
1996
c61393ea 1997static int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
dfd982ba 1998{
9af28511
SH		 1999 if (addr == 0)
2000 return -1;
dfd982ba
YH		 2001 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
2002 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
2003 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
2004 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
2005 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
2006 ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
2007 eui[1] = 0;
2008 eui[2] = 0x5E;
2009 eui[3] = 0xFE;
2010 memcpy(eui + 4, &addr, 4);
2011 return 0;
2012}
dfd982ba
YH		 2013
2014static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
2015{
2016 if (dev->priv_flags & IFF_ISATAP)
2017 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
2018 return -1;
2019}
2020
aee80b54 2021static int addrconf_ifid_gre(u8 *eui, struct net_device *dev)
2022{
2023 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
2024}
2025
e837735e
ND		 2026static int addrconf_ifid_ip6tnl(u8 *eui, struct net_device *dev)
2027{
2028 memcpy(eui, dev->perm_addr, 3);
2029 memcpy(eui + 5, dev->perm_addr + 3, 3);
2030 eui[3] = 0xFF;
2031 eui[4] = 0xFE;
2032 eui[0] ^= 2;
2033 return 0;
2034}
2035
1da177e4
LT		 2036static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
2037{
2038 switch (dev->type) {
2039 case ARPHRD_ETHER:
2040 case ARPHRD_FDDI:
073a8e0e 2041 return addrconf_ifid_eui48(eui, dev);
1da177e4 2042 case ARPHRD_ARCNET:
073a8e0e 2043 return addrconf_ifid_arcnet(eui, dev);
1da177e4 2044 case ARPHRD_INFINIBAND:
073a8e0e 2045 return addrconf_ifid_infiniband(eui, dev);
c7dc89c0 2046 case ARPHRD_SIT:
dfd982ba 2047 return addrconf_ifid_sit(eui, dev);
aee80b54 2048 case ARPHRD_IPGRE:
2049 return addrconf_ifid_gre(eui, dev);
e74bccb8 2050 case ARPHRD_6LOWPAN:
06a4c1c5 2051 return addrconf_ifid_eui64(eui, dev);
cb6bf355
YH		 2052 case ARPHRD_IEEE1394:
2053 return addrconf_ifid_ieee1394(eui, dev);
e837735e
ND		 2054 case ARPHRD_TUNNEL6:
2055 return addrconf_ifid_ip6tnl(eui, dev);
1da177e4
LT		 2056 }
2057 return -1;
2058}
2059
2060static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
2061{
2062 int err = -1;
2063 struct inet6_ifaddr *ifp;
2064
2065 read_lock_bh(&idev->lock);
602582ca
HFS		 2066 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
2067 if (ifp->scope > IFA_LINK)
2068 break;
1da177e4
LT		 2069 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
2070 memcpy(eui, ifp->addr.s6_addr+8, 8);
2071 err = 0;
2072 break;
2073 }
2074 }
2075 read_unlock_bh(&idev->lock);
2076 return err;
2077}
2078
1da177e4 2079/* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
eb7e0575 2080static void __ipv6_regen_rndid(struct inet6_dev *idev)
1da177e4 2081{
1da177e4 2082regen:
955189ef 2083 get_random_bytes(idev->rndid, sizeof(idev->rndid));
1da177e4 2084 idev->rndid[0] &= ~0x02;
1da177e4
LT		 2085
2086 /*
2087 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
2088 * check if generated address is not inappropriate
2089 *
2090 * - Reserved subnet anycast (RFC 2526)
2091 * 11111101 11....11 1xxxxxxx
c7dc89c0 2092 * - ISATAP (RFC4214) 6.1
1da177e4
LT		 2093 * 00-00-5E-FE-xx-xx-xx-xx
2094 * - value 0
2095 * - XXX: already assigned to an address on the device
2096 */
1ab1457c 2097 if (idev->rndid[0] == 0xfd &&
1da177e4
LT		 2098 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
2099 (idev->rndid[7]&0x80))
2100 goto regen;
2101 if ((idev->rndid[0]|idev->rndid[1]) == 0) {
2102 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
2103 goto regen;
2104 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
2105 goto regen;
2106 }
1da177e4
LT		 2107}
2108
2109static void ipv6_regen_rndid(unsigned long data)
2110{
2111 struct inet6_dev *idev = (struct inet6_dev *) data;
2112 unsigned long expires;
2113
8814c4b5 2114 rcu_read_lock_bh();
1da177e4
LT		 2115 write_lock_bh(&idev->lock);
2116
2117 if (idev->dead)
2118 goto out;
2119
eb7e0575 2120 __ipv6_regen_rndid(idev);
1ab1457c 2121
1da177e4 2122 expires = jiffies +
1ab1457c 2123 idev->cnf.temp_prefered_lft * HZ -
1f9248e5
JP		 2124 idev->cnf.regen_max_retry * idev->cnf.dad_transmits *
2125 NEIGH_VAR(idev->nd_parms, RETRANS_TIME) -
784e2710 2126 idev->cnf.max_desync_factor * HZ;
1da177e4 2127 if (time_before(expires, jiffies)) {
f3213831
JP		 2128 pr_warn("%s: too short regeneration interval; timer disabled for %s\n",
2129 __func__, idev->dev->name);
1da177e4
LT		 2130 goto out;
2131 }
2132
2133 if (!mod_timer(&idev->regen_timer, expires))
2134 in6_dev_hold(idev);
2135
2136out:
2137 write_unlock_bh(&idev->lock);
8814c4b5 2138 rcu_read_unlock_bh();
1da177e4
LT		 2139 in6_dev_put(idev);
2140}
2141
eb7e0575 2142static void __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr)
8e5e8f30 2143{
1da177e4 2144 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
eb7e0575 2145 __ipv6_regen_rndid(idev);
1da177e4 2146}
1da177e4
LT		 2147
2148/*
2149 * Add prefix route.
2150 */
2151
2152static void
2153addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
e431b8c0 2154 unsigned long expires, u32 flags)
1da177e4 2155{
86872cb5 2156 struct fib6_config cfg = {
ca254490 2157 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX,
86872cb5
TG		 2158 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2159 .fc_ifindex = dev->ifindex,
2160 .fc_expires = expires,
2161 .fc_dst_len = plen,
2162 .fc_flags = RTF_UP | flags,
c346dca1 2163 .fc_nlinfo.nl_net = dev_net(dev),
f410a1fb 2164 .fc_protocol = RTPROT_KERNEL,
86872cb5 2165 };
1da177e4 2166
4e3fd7a0 2167 cfg.fc_dst = *pfx;
1da177e4
LT		 2168
2169 /* Prevent useless cloning on PtP SIT.
2170 This thing is done here expecting that the whole
2171 class of non-broadcast devices need not cloning.
2172 */
07a93626 2173#if IS_ENABLED(CONFIG_IPV6_SIT)
86872cb5
TG		 2174 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
2175 cfg.fc_flags |= RTF_NONEXTHOP;
0be669bb 2176#endif
1da177e4 2177
86872cb5 2178 ip6_route_add(&cfg);
1da177e4
LT		 2179}
2180
14ef37b6
AH		 2181
2182static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
2183 int plen,
2184 const struct net_device *dev,
2185 u32 flags, u32 noflags)
2186{
2187 struct fib6_node *fn;
2188 struct rt6_info *rt = NULL;
2189 struct fib6_table *table;
ca254490 2190 u32 tb_id = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX;
14ef37b6 2191
ca254490 2192 table = fib6_get_table(dev_net(dev), tb_id);
63159f29 2193 if (!table)
14ef37b6
AH		 2194 return NULL;
2195
5744dd9b 2196 read_lock_bh(&table->tb6_lock);
14ef37b6
AH		 2197 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0);
2198 if (!fn)
2199 goto out;
1f56a01f
MKL		 2200
2201 noflags |= RTF_CACHE;
14ef37b6 2202 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
d1918542 2203 if (rt->dst.dev->ifindex != dev->ifindex)
14ef37b6
AH		 2204 continue;
2205 if ((rt->rt6i_flags & flags) != flags)
2206 continue;
85da53bf 2207 if ((rt->rt6i_flags & noflags) != 0)
14ef37b6
AH		 2208 continue;
2209 dst_hold(&rt->dst);
2210 break;
2211 }
2212out:
5744dd9b 2213 read_unlock_bh(&table->tb6_lock);
14ef37b6
AH		 2214 return rt;
2215}
2216
2217
1da177e4
LT		 2218/* Create "default" multicast route to the interface */
2219
2220static void addrconf_add_mroute(struct net_device *dev)
2221{
86872cb5 2222 struct fib6_config cfg = {
ca254490 2223 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_LOCAL,
86872cb5
TG		 2224 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2225 .fc_ifindex = dev->ifindex,
2226 .fc_dst_len = 8,
2227 .fc_flags = RTF_UP,
c346dca1 2228 .fc_nlinfo.nl_net = dev_net(dev),
86872cb5
TG		 2229 };
2230
2231 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
2232
2233 ip6_route_add(&cfg);
1da177e4
LT		 2234}
2235
1da177e4
LT		 2236static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
2237{
2238 struct inet6_dev *idev;
2239
2240 ASSERT_RTNL();
2241
e21e8467
SH		 2242 idev = ipv6_find_idev(dev);
2243 if (!idev)
64e724f6
BH		 2244 return ERR_PTR(-ENOBUFS);
2245
2246 if (idev->cnf.disable_ipv6)
2247 return ERR_PTR(-EACCES);
1da177e4
LT		 2248
2249 /* Add default multicast route */
4af04aba
LW		 2250 if (!(dev->flags & IFF_LOOPBACK))
2251 addrconf_add_mroute(dev);
1da177e4 2252
1da177e4
LT		 2253 return idev;
2254}
2255
53bd6749
JP		 2256static void manage_tempaddrs(struct inet6_dev *idev,
2257 struct inet6_ifaddr *ifp,
2258 __u32 valid_lft, __u32 prefered_lft,
2259 bool create, unsigned long now)
2260{
2261 u32 flags;
2262 struct inet6_ifaddr *ift;
2263
2264 read_lock_bh(&idev->lock);
2265 /* update all temporary addresses in the list */
2266 list_for_each_entry(ift, &idev->tempaddr_list, tmp_list) {
2267 int age, max_valid, max_prefered;
2268
2269 if (ifp != ift->ifpub)
2270 continue;
2271
2272 /* RFC 4941 section 3.3:
2273 * If a received option will extend the lifetime of a public
2274 * address, the lifetimes of temporary addresses should
2275 * be extended, subject to the overall constraint that no
2276 * temporary addresses should ever remain "valid" or "preferred"
2277 * for a time longer than (TEMP_VALID_LIFETIME) or
2278 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), respectively.
2279 */
2280 age = (now - ift->cstamp) / HZ;
2281 max_valid = idev->cnf.temp_valid_lft - age;
2282 if (max_valid < 0)
2283 max_valid = 0;
2284
2285 max_prefered = idev->cnf.temp_prefered_lft -
2286 idev->cnf.max_desync_factor - age;
2287 if (max_prefered < 0)
2288 max_prefered = 0;
2289
2290 if (valid_lft > max_valid)
2291 valid_lft = max_valid;
2292
2293 if (prefered_lft > max_prefered)
2294 prefered_lft = max_prefered;
2295
2296 spin_lock(&ift->lock);
2297 flags = ift->flags;
2298 ift->valid_lft = valid_lft;
2299 ift->prefered_lft = prefered_lft;
2300 ift->tstamp = now;
2301 if (prefered_lft > 0)
2302 ift->flags &= ~IFA_F_DEPRECATED;
2303
2304 spin_unlock(&ift->lock);
2305 if (!(flags&IFA_F_TENTATIVE))
2306 ipv6_ifa_notify(0, ift);
2307 }
2308
2309 if ((create || list_empty(&idev->tempaddr_list)) &&
2310 idev->cnf.use_tempaddr > 0) {
2311 /* When a new public address is created as described
2312 * in [ADDRCONF], also create a new temporary address.
2313 * Also create a temporary address if it's enabled but
2314 * no temporary address currently exists.
2315 */
2316 read_unlock_bh(&idev->lock);
2317 ipv6_create_tempaddr(ifp, NULL);
2318 } else {
2319 read_unlock_bh(&idev->lock);
2320 }
2321}
2322
cc9da6cc
BM		 2323static bool is_addr_mode_generate_stable(struct inet6_dev *idev)
2324{
2325 return idev->addr_gen_mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY ||
2326 idev->addr_gen_mode == IN6_ADDR_GEN_MODE_RANDOM;
2327}
2328
e6bff995 2329void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao)
1da177e4
LT		 2330{
2331 struct prefix_info *pinfo;
2332 __u32 valid_lft;
2333 __u32 prefered_lft;
2334 int addr_type;
64236f3f 2335 u32 addr_flags = 0;
1da177e4 2336 struct inet6_dev *in6_dev;
56d417b1 2337 struct net *net = dev_net(dev);
1da177e4
LT		 2338
2339 pinfo = (struct prefix_info *) opt;
1ab1457c 2340
1da177e4 2341 if (len < sizeof(struct prefix_info)) {
ba3542e1 2342 ADBG("addrconf: prefix option too short\n");
1da177e4
LT		 2343 return;
2344 }
1ab1457c 2345
1da177e4
LT		 2346 /*
2347 * Validation checks ([ADDRCONF], page 19)
2348 */
2349
2350 addr_type = ipv6_addr_type(&pinfo->prefix);
2351
2352 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
2353 return;
2354
2355 valid_lft = ntohl(pinfo->valid);
2356 prefered_lft = ntohl(pinfo->prefered);
2357
2358 if (prefered_lft > valid_lft) {
e87cc472 2359 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n");
1da177e4
LT		 2360 return;
2361 }
2362
2363 in6_dev = in6_dev_get(dev);
2364
63159f29 2365 if (!in6_dev) {
e87cc472
JP		 2366 net_dbg_ratelimited("addrconf: device %s not configured\n",
2367 dev->name);
1da177e4
LT		 2368 return;
2369 }
2370
2371 /*
2372 * Two things going on here:
2373 * 1) Add routes for on-link prefixes
2374 * 2) Configure prefixes with the auto flag set
2375 */
2376
4bed72e4
YH		 2377 if (pinfo->onlink) {
2378 struct rt6_info *rt;
2379 unsigned long rt_expires;
2380
6f704992
YH		 2381 /* Avoid arithmetic overflow. Really, we could
2382 * save rt_expires in seconds, likely valid_lft,
2383 * but it would require division in fib gc, that it
2384 * not good.
2385 */
4bed72e4
YH		 2386 if (HZ > USER_HZ)
2387 rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
2388 else
2389 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
3dd4bc68 2390
4bed72e4
YH		 2391 if (addrconf_finite_timeout(rt_expires))
2392 rt_expires *= HZ;
1da177e4 2393
14ef37b6
AH		 2394 rt = addrconf_get_prefix_route(&pinfo->prefix,
2395 pinfo->prefix_len,
2396 dev,
2397 RTF_ADDRCONF | RTF_PREFIX_RT,
2398 RTF_GATEWAY | RTF_DEFAULT);
1da177e4 2399
14ef37b6 2400 if (rt) {
6f704992
YH		 2401 /* Autoconf prefix route */
2402 if (valid_lft == 0) {
2403 ip6_del_rt(rt);
2404 rt = NULL;
4bed72e4 2405 } else if (addrconf_finite_timeout(rt_expires)) {
6f704992 2406 /* not infinity */
1716a961 2407 rt6_set_expires(rt, jiffies + rt_expires);
6f704992 2408 } else {
1716a961 2409 rt6_clean_expires(rt);
1da177e4
LT		 2410 }
2411 } else if (valid_lft) {
6f704992 2412 clock_t expires = 0;
4bed72e4
YH		 2413 int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
2414 if (addrconf_finite_timeout(rt_expires)) {
6f704992
YH		 2415 /* not infinity */
2416 flags |= RTF_EXPIRES;
2417 expires = jiffies_to_clock_t(rt_expires);
2418 }
1da177e4 2419 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
6f704992 2420 dev, expires, flags);
1da177e4 2421 }
94e187c0 2422 ip6_rt_put(rt);
1da177e4
LT		 2423 }
2424
2425 /* Try to figure out our local address for this prefix */
2426
2427 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
8e5e8f30 2428 struct inet6_ifaddr *ifp;
1da177e4
LT		 2429 struct in6_addr addr;
2430 int create = 0, update_lft = 0;
617fe29d 2431 bool tokenized = false;
1da177e4
LT		 2432
2433 if (pinfo->prefix_len == 64) {
2434 memcpy(&addr, &pinfo->prefix, 8);
f53adae4
DB		 2435
2436 if (!ipv6_addr_any(&in6_dev->token)) {
2437 read_lock_bh(&in6_dev->lock);
2438 memcpy(addr.s6_addr + 8,
2439 in6_dev->token.s6_addr + 8, 8);
2440 read_unlock_bh(&in6_dev->lock);
617fe29d 2441 tokenized = true;
cc9da6cc 2442 } else if (is_addr_mode_generate_stable(in6_dev) &&
622c81d5
HFS		 2443 !ipv6_generate_stable_address(&addr, 0,
2444 in6_dev)) {
64236f3f 2445 addr_flags |= IFA_F_STABLE_PRIVACY;
622c81d5 2446 goto ok;
f53adae4
DB		 2447 } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
2448 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
1da177e4
LT		 2449 in6_dev_put(in6_dev);
2450 return;
2451 }
2452 goto ok;
2453 }
e87cc472
JP		 2454 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n",
2455 pinfo->prefix_len);
1da177e4
LT		 2456 in6_dev_put(in6_dev);
2457 return;
2458
2459ok:
2460
53b7997f 2461 ifp = ipv6_get_ifaddr(net, &addr, dev, 1);
1da177e4 2462
63159f29 2463 if (!ifp && valid_lft) {
1da177e4 2464 int max_addresses = in6_dev->cnf.max_addresses;
95c385b4
NH		 2465
2466#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2467 if (in6_dev->cnf.optimistic_dad &&
e6bff995 2468 !net->ipv6.devconf_all->forwarding && sllao)
9a1ec461 2469 addr_flags |= IFA_F_OPTIMISTIC;
95c385b4 2470#endif
1da177e4
LT		 2471
2472 /* Do not allow to create too much of autoconfigured
2473 * addresses; this would be too easy way to crash kernel.
2474 */
2475 if (!max_addresses ||
2476 ipv6_count_addresses(in6_dev) < max_addresses)
3f8f5298
JP		 2477 ifp = ipv6_add_addr(in6_dev, &addr, NULL,
2478 pinfo->prefix_len,
95c385b4 2479 addr_type&IPV6_ADDR_SCOPE_MASK,
8a226b2c
JB		 2480 addr_flags, valid_lft,
2481 prefered_lft);
1da177e4 2482
3f0d2ba0 2483 if (IS_ERR_OR_NULL(ifp)) {
1da177e4
LT		 2484 in6_dev_put(in6_dev);
2485 return;
2486 }
2487
8a226b2c
JB		 2488 update_lft = 0;
2489 create = 1;
c15b1cca
HFS		 2490 spin_lock_bh(&ifp->lock);
2491 ifp->flags |= IFA_F_MANAGETEMPADDR;
1da177e4 2492 ifp->cstamp = jiffies;
617fe29d 2493 ifp->tokenized = tokenized;
c15b1cca 2494 spin_unlock_bh(&ifp->lock);
cf22f9a2 2495 addrconf_dad_start(ifp);
1da177e4
LT		 2496 }
2497
2498 if (ifp) {
479840ff 2499 u32 flags;
1da177e4 2500 unsigned long now;
1da177e4
LT		 2501 u32 stored_lft;
2502
2503 /* update lifetime (RFC2462 5.5.3 e) */
8e8e676d 2504 spin_lock_bh(&ifp->lock);
1da177e4
LT		 2505 now = jiffies;
2506 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
2507 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
2508 else
2509 stored_lft = 0;
8a226b2c 2510 if (!update_lft && !create && stored_lft) {
9451a304
FF		 2511 const u32 minimum_lft = min_t(u32,
2512 stored_lft, MIN_VALID_LIFETIME);
c9d55d5b
PM		 2513 valid_lft = max(valid_lft, minimum_lft);
2514
2515 /* RFC4862 Section 5.5.3e:
2516 * "Note that the preferred lifetime of the
2517 * corresponding address is always reset to
2518 * the Preferred Lifetime in the received
2519 * Prefix Information option, regardless of
2520 * whether the valid lifetime is also reset or
2521 * ignored."
2522 *
2523 * So we should always update prefered_lft here.
2524 */
2525 update_lft = 1;
1da177e4
LT		 2526 }
2527
2528 if (update_lft) {
2529 ifp->valid_lft = valid_lft;
2530 ifp->prefered_lft = prefered_lft;
2531 ifp->tstamp = now;
2532 flags = ifp->flags;
2533 ifp->flags &= ~IFA_F_DEPRECATED;
8e8e676d 2534 spin_unlock_bh(&ifp->lock);
1da177e4
LT		 2535
2536 if (!(flags&IFA_F_TENTATIVE))
2537 ipv6_ifa_notify(0, ifp);
2538 } else
8e8e676d 2539 spin_unlock_bh(&ifp->lock);
1da177e4 2540
53bd6749
JP		 2541 manage_tempaddrs(in6_dev, ifp, valid_lft, prefered_lft,
2542 create, now);
5d9efa7e 2543
1da177e4 2544 in6_ifa_put(ifp);
c15b1cca 2545 addrconf_verify();
1da177e4
LT		 2546 }
2547 }
2548 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
2549 in6_dev_put(in6_dev);
2550}
2551
2552/*
2553 * Set destination address.
2554 * Special case for SIT interfaces where we create a new "virtual"
2555 * device.
2556 */
af284937 2557int addrconf_set_dstaddr(struct net *net, void __user *arg)
1da177e4
LT		 2558{
2559 struct in6_ifreq ireq;
2560 struct net_device *dev;
2561 int err = -EINVAL;
2562
2563 rtnl_lock();
2564
2565 err = -EFAULT;
2566 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2567 goto err_exit;
2568
af284937 2569 dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
1da177e4
LT		 2570
2571 err = -ENODEV;
63159f29 2572 if (!dev)
1da177e4
LT		 2573 goto err_exit;
2574
07a93626 2575#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4 2576 if (dev->type == ARPHRD_SIT) {
5bc3eb7e 2577 const struct net_device_ops *ops = dev->netdev_ops;
1da177e4 2578 struct ifreq ifr;
1da177e4
LT		 2579 struct ip_tunnel_parm p;
2580
2581 err = -EADDRNOTAVAIL;
2582 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2583 goto err_exit;
2584
2585 memset(&p, 0, sizeof(p));
2586 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2587 p.iph.saddr = 0;
2588 p.iph.version = 4;
2589 p.iph.ihl = 5;
2590 p.iph.protocol = IPPROTO_IPV6;
2591 p.iph.ttl = 64;
d20b3109 2592 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
1da177e4 2593
5bc3eb7e
SH		 2594 if (ops->ndo_do_ioctl) {
2595 mm_segment_t oldfs = get_fs();
2596
2597 set_fs(KERNEL_DS);
2598 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2599 set_fs(oldfs);
2600 } else
2601 err = -EOPNOTSUPP;
1da177e4
LT		 2602
2603 if (err == 0) {
2604 err = -ENOBUFS;
af284937
DL		 2605 dev = __dev_get_by_name(net, p.name);
2606 if (!dev)
1da177e4
LT		 2607 goto err_exit;
2608 err = dev_open(dev);
2609 }
2610 }
0be669bb 2611#endif
1da177e4
LT		 2612
2613err_exit:
2614 rtnl_unlock();
2615 return err;
2616}
2617
93a714d6
MC		 2618static int ipv6_mc_config(struct sock *sk, bool join,
2619 const struct in6_addr *addr, int ifindex)
2620{
2621 int ret;
2622
2623 ASSERT_RTNL();
2624
2625 lock_sock(sk);
2626 if (join)
54ff9ef3 2627 ret = ipv6_sock_mc_join(sk, ifindex, addr);
93a714d6 2628 else
54ff9ef3 2629 ret = ipv6_sock_mc_drop(sk, ifindex, addr);
93a714d6
MC		 2630 release_sock(sk);
2631
2632 return ret;
2633}
2634
1da177e4
LT		 2635/*
2636 * Manual configuration of address on an interface
2637 */
479840ff
JP		 2638static int inet6_addr_add(struct net *net, int ifindex,
2639 const struct in6_addr *pfx,
caeaba79 2640 const struct in6_addr *peer_pfx,
479840ff
JP		 2641 unsigned int plen, __u32 ifa_flags,
2642 __u32 prefered_lft, __u32 valid_lft)
1da177e4
LT		 2643{
2644 struct inet6_ifaddr *ifp;
2645 struct inet6_dev *idev;
2646 struct net_device *dev;
93a714d6
MC		 2647 unsigned long timeout;
2648 clock_t expires;
1da177e4 2649 int scope;
6f704992 2650 u32 flags;
1da177e4
LT		 2651
2652 ASSERT_RTNL();
1ab1457c 2653
24ef0da7
TG		 2654 if (plen > 128)
2655 return -EINVAL;
2656
0778769d
NT		 2657 /* check the lifetime */
2658 if (!valid_lft || prefered_lft > valid_lft)
2659 return -EINVAL;
2660
53bd6749
JP		 2661 if (ifa_flags & IFA_F_MANAGETEMPADDR && plen != 64)
2662 return -EINVAL;
2663
af284937
DL		 2664 dev = __dev_get_by_index(net, ifindex);
2665 if (!dev)
1da177e4 2666 return -ENODEV;
1ab1457c 2667
64e724f6
BH		 2668 idev = addrconf_add_dev(dev);
2669 if (IS_ERR(idev))
2670 return PTR_ERR(idev);
1da177e4 2671
93a714d6
MC		 2672 if (ifa_flags & IFA_F_MCAUTOJOIN) {
2673 int ret = ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2674 true, pfx, ifindex);
2675
2676 if (ret < 0)
2677 return ret;
2678 }
2679
1da177e4
LT		 2680 scope = ipv6_addr_scope(pfx);
2681
4bed72e4
YH		 2682 timeout = addrconf_timeout_fixup(valid_lft, HZ);
2683 if (addrconf_finite_timeout(timeout)) {
2684 expires = jiffies_to_clock_t(timeout * HZ);
2685 valid_lft = timeout;
6f704992 2686 flags = RTF_EXPIRES;
4bed72e4
YH		 2687 } else {
2688 expires = 0;
2689 flags = 0;
2690 ifa_flags |= IFA_F_PERMANENT;
6f704992 2691 }
0778769d 2692
4bed72e4
YH		 2693 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
2694 if (addrconf_finite_timeout(timeout)) {
2695 if (timeout == 0)
2696 ifa_flags |= IFA_F_DEPRECATED;
2697 prefered_lft = timeout;
2698 }
0778769d 2699
8a226b2c
JB		 2700 ifp = ipv6_add_addr(idev, pfx, peer_pfx, plen, scope, ifa_flags,
2701 valid_lft, prefered_lft);
0778769d 2702
1da177e4 2703 if (!IS_ERR(ifp)) {
761aac73
TH		 2704 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) {
2705 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
2706 expires, flags);
2707 }
2708
95c385b4
NH		 2709 /*
2710 * Note that section 3.1 of RFC 4429 indicates
2711 * that the Optimistic flag should not be set for
2712 * manually configured addresses
2713 */
cf22f9a2 2714 addrconf_dad_start(ifp);
53bd6749
JP		 2715 if (ifa_flags & IFA_F_MANAGETEMPADDR)
2716 manage_tempaddrs(idev, ifp, valid_lft, prefered_lft,
2717 true, jiffies);
1da177e4 2718 in6_ifa_put(ifp);
c15b1cca 2719 addrconf_verify_rtnl();
1da177e4 2720 return 0;
93a714d6
MC		 2721 } else if (ifa_flags & IFA_F_MCAUTOJOIN) {
2722 ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2723 false, pfx, ifindex);
1da177e4
LT		 2724 }
2725
2726 return PTR_ERR(ifp);
2727}
2728
6046d5b4
HK		 2729static int inet6_addr_del(struct net *net, int ifindex, u32 ifa_flags,
2730 const struct in6_addr *pfx, unsigned int plen)
1da177e4
LT		 2731{
2732 struct inet6_ifaddr *ifp;
2733 struct inet6_dev *idev;
2734 struct net_device *dev;
1ab1457c 2735
24ef0da7
TG		 2736 if (plen > 128)
2737 return -EINVAL;
2738
af284937
DL		 2739 dev = __dev_get_by_index(net, ifindex);
2740 if (!dev)
1da177e4
LT		 2741 return -ENODEV;
2742
e5d08d71 2743 idev = __in6_dev_get(dev);
63159f29 2744 if (!idev)
1da177e4
LT		 2745 return -ENXIO;
2746
2747 read_lock_bh(&idev->lock);
502a2ffd 2748 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1da177e4
LT		 2749 if (ifp->prefix_len == plen &&
2750 ipv6_addr_equal(pfx, &ifp->addr)) {
2751 in6_ifa_hold(ifp);
2752 read_unlock_bh(&idev->lock);
1ab1457c 2753
6046d5b4
HK		 2754 if (!(ifp->flags & IFA_F_TEMPORARY) &&
2755 (ifa_flags & IFA_F_MANAGETEMPADDR))
2756 manage_tempaddrs(idev, ifp, 0, 0, false,
2757 jiffies);
1da177e4 2758 ipv6_del_addr(ifp);
6046d5b4 2759 addrconf_verify_rtnl();
93a714d6
MC		 2760 if (ipv6_addr_is_multicast(pfx)) {
2761 ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2762 false, pfx, dev->ifindex);
2763 }
1da177e4
LT		 2764 return 0;
2765 }
2766 }
2767 read_unlock_bh(&idev->lock);
2768 return -EADDRNOTAVAIL;
2769}
2770
2771
af284937 2772int addrconf_add_ifaddr(struct net *net, void __user *arg)
1da177e4
LT		 2773{
2774 struct in6_ifreq ireq;
2775 int err;
1ab1457c 2776
af31f412 2777 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1da177e4 2778 return -EPERM;
1ab1457c 2779
1da177e4
LT		 2780 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2781 return -EFAULT;
2782
2783 rtnl_lock();
caeaba79 2784 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, NULL,
af284937
DL		 2785 ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2786 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
1da177e4
LT		 2787 rtnl_unlock();
2788 return err;
2789}
2790
af284937 2791int addrconf_del_ifaddr(struct net *net, void __user *arg)
1da177e4
LT		 2792{
2793 struct in6_ifreq ireq;
2794 int err;
1ab1457c 2795
af31f412 2796 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1da177e4
LT		 2797 return -EPERM;
2798
2799 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2800 return -EFAULT;
2801
2802 rtnl_lock();
6046d5b4 2803 err = inet6_addr_del(net, ireq.ifr6_ifindex, 0, &ireq.ifr6_addr,
af284937 2804 ireq.ifr6_prefixlen);
1da177e4
LT		 2805 rtnl_unlock();
2806 return err;
2807}
2808
b5f348e5
IJ		 2809static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
2810 int plen, int scope)
2811{
2812 struct inet6_ifaddr *ifp;
2813
8a226b2c 2814 ifp = ipv6_add_addr(idev, addr, NULL, plen,
07edd741
HFS		 2815 scope, IFA_F_PERMANENT,
2816 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
b5f348e5
IJ		 2817 if (!IS_ERR(ifp)) {
2818 spin_lock_bh(&ifp->lock);
2819 ifp->flags &= ~IFA_F_TENTATIVE;
2820 spin_unlock_bh(&ifp->lock);
2821 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2822 in6_ifa_put(ifp);
2823 }
2824}
2825
07a93626 2826#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4
LT		 2827static void sit_add_v4_addrs(struct inet6_dev *idev)
2828{
1da177e4
LT		 2829 struct in6_addr addr;
2830 struct net_device *dev;
c346dca1 2831 struct net *net = dev_net(idev->dev);
929c9cf3 2832 int scope, plen;
f0e2acfa 2833 u32 pflags = 0;
1da177e4
LT		 2834
2835 ASSERT_RTNL();
2836
2837 memset(&addr, 0, sizeof(struct in6_addr));
2838 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2839
2840 if (idev->dev->flags&IFF_POINTOPOINT) {
2841 addr.s6_addr32[0] = htonl(0xfe800000);
2842 scope = IFA_LINK;
929c9cf3 2843 plen = 64;
1da177e4
LT		 2844 } else {
2845 scope = IPV6_ADDR_COMPATv4;
929c9cf3 2846 plen = 96;
f0e2acfa 2847 pflags |= RTF_NONEXTHOP;
1da177e4
LT		 2848 }
2849
2850 if (addr.s6_addr32[3]) {
929c9cf3 2851 add_addr(idev, &addr, plen, scope);
f0e2acfa 2852 addrconf_prefix_route(&addr, plen, idev->dev, 0, pflags);
1da177e4
LT		 2853 return;
2854 }
2855
6fda7350 2856 for_each_netdev(net, dev) {
8e5e8f30 2857 struct in_device *in_dev = __in_dev_get_rtnl(dev);
1da177e4 2858 if (in_dev && (dev->flags & IFF_UP)) {
8e5e8f30 2859 struct in_ifaddr *ifa;
1da177e4
LT		 2860
2861 int flag = scope;
2862
2863 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
1da177e4
LT		 2864
2865 addr.s6_addr32[3] = ifa->ifa_local;
2866
2867 if (ifa->ifa_scope == RT_SCOPE_LINK)
2868 continue;
2869 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2870 if (idev->dev->flags&IFF_POINTOPOINT)
2871 continue;
2872 flag |= IFA_HOST;
2873 }
1da177e4 2874
b5f348e5 2875 add_addr(idev, &addr, plen, flag);
f0e2acfa
ND		 2876 addrconf_prefix_route(&addr, plen, idev->dev, 0,
2877 pflags);
1da177e4
LT		 2878 }
2879 }
1ab1457c 2880 }
1da177e4 2881}
0be669bb 2882#endif
1da177e4
LT		 2883
2884static void init_loopback(struct net_device *dev)
2885{
2886 struct inet6_dev *idev;
25fb6ca4
BK		 2887 struct net_device *sp_dev;
2888 struct inet6_ifaddr *sp_ifa;
2889 struct rt6_info *sp_rt;
1da177e4
LT		 2890
2891 /* ::1 */
2892
2893 ASSERT_RTNL();
2894
e5d08d71 2895 idev = ipv6_find_idev(dev);
63159f29 2896 if (!idev) {
91df42be 2897 pr_debug("%s: add_dev failed\n", __func__);
1da177e4
LT		 2898 return;
2899 }
2900
b5f348e5 2901 add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
25fb6ca4
BK		 2902
2903 /* Add routes to other interface's IPv6 addresses */
2904 for_each_netdev(dev_net(dev), sp_dev) {
2905 if (!strcmp(sp_dev->name, dev->name))
2906 continue;
2907
2908 idev = __in6_dev_get(sp_dev);
2909 if (!idev)
2910 continue;
2911
2912 read_lock_bh(&idev->lock);
2913 list_for_each_entry(sp_ifa, &idev->addr_list, if_list) {
2914
2915 if (sp_ifa->flags & (IFA_F_DADFAILED | IFA_F_TENTATIVE))
2916 continue;
2917
33d99113
G		 2918 if (sp_ifa->rt) {
2919 /* This dst has been added to garbage list when
2920 * lo device down, release this obsolete dst and
2921 * reallocate a new router for ifa.
2922 */
2923 if (sp_ifa->rt->dst.obsolete > 0) {
2924 ip6_rt_put(sp_ifa->rt);
2925 sp_ifa->rt = NULL;
2926 } else {
2927 continue;
2928 }
2929 }
a881ae1f 2930
57ec0afe 2931 sp_rt = addrconf_dst_alloc(idev, &sp_ifa->addr, false);
25fb6ca4
BK		 2932
2933 /* Failure cases are ignored */
534c8779
G		 2934 if (!IS_ERR(sp_rt)) {
2935 sp_ifa->rt = sp_rt;
25fb6ca4 2936 ip6_ins_rt(sp_rt);
534c8779 2937 }
25fb6ca4
BK		 2938 }
2939 read_unlock_bh(&idev->lock);
2940 }
1da177e4
LT		 2941}
2942
64236f3f
HFS		 2943static void addrconf_add_linklocal(struct inet6_dev *idev,
2944 const struct in6_addr *addr, u32 flags)
1da177e4 2945{
8e5e8f30 2946 struct inet6_ifaddr *ifp;
64236f3f 2947 u32 addr_flags = flags | IFA_F_PERMANENT;
95c385b4
NH		 2948
2949#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2950 if (idev->cnf.optimistic_dad &&
702beb87 2951 !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
95c385b4
NH		 2952 addr_flags |= IFA_F_OPTIMISTIC;
2953#endif
1da177e4 2954
07edd741
HFS		 2955 ifp = ipv6_add_addr(idev, addr, NULL, 64, IFA_LINK, addr_flags,
2956 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
1da177e4 2957 if (!IS_ERR(ifp)) {
46d48046 2958 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
cf22f9a2 2959 addrconf_dad_start(ifp);
1da177e4
LT		 2960 in6_ifa_put(ifp);
2961 }
2962}
2963
622c81d5
HFS		 2964static bool ipv6_reserved_interfaceid(struct in6_addr address)
2965{
2966 if ((address.s6_addr32[2] | address.s6_addr32[3]) == 0)
2967 return true;
2968
2969 if (address.s6_addr32[2] == htonl(0x02005eff) &&
2970 ((address.s6_addr32[3] & htonl(0xfe000000)) == htonl(0xfe000000)))
2971 return true;
2972
2973 if (address.s6_addr32[2] == htonl(0xfdffffff) &&
2974 ((address.s6_addr32[3] & htonl(0xffffff80)) == htonl(0xffffff80)))
2975 return true;
2976
2977 return false;
2978}
2979
2980static int ipv6_generate_stable_address(struct in6_addr *address,
2981 u8 dad_count,
2982 const struct inet6_dev *idev)
2983{
622c81d5
HFS		 2984 static DEFINE_SPINLOCK(lock);
2985 static __u32 digest[SHA_DIGEST_WORDS];
2986 static __u32 workspace[SHA_WORKSPACE_WORDS];
2987
2988 static union {
2989 char __data[SHA_MESSAGE_BYTES];
2990 struct {
2991 struct in6_addr secret;
ff40217e 2992 __be32 prefix[2];
622c81d5
HFS		 2993 unsigned char hwaddr[MAX_ADDR_LEN];
2994 u8 dad_count;
2995 } __packed;
2996 } data;
2997
2998 struct in6_addr secret;
2999 struct in6_addr temp;
3000 struct net *net = dev_net(idev->dev);
3001
3002 BUILD_BUG_ON(sizeof(data.__data) != sizeof(data));
3003
3004 if (idev->cnf.stable_secret.initialized)
3005 secret = idev->cnf.stable_secret.secret;
3006 else if (net->ipv6.devconf_dflt->stable_secret.initialized)
3007 secret = net->ipv6.devconf_dflt->stable_secret.secret;
3008 else
3009 return -1;
3010
3011retry:
3012 spin_lock_bh(&lock);
3013
3014 sha_init(digest);
3015 memset(&data, 0, sizeof(data));
3016 memset(workspace, 0, sizeof(workspace));
3017 memcpy(data.hwaddr, idev->dev->perm_addr, idev->dev->addr_len);
ff40217e
HFS		 3018 data.prefix[0] = address->s6_addr32[0];
3019 data.prefix[1] = address->s6_addr32[1];
622c81d5
HFS		 3020 data.secret = secret;
3021 data.dad_count = dad_count;
3022
3023 sha_transform(digest, data.__data, workspace);
3024
3025 temp = *address;
ff40217e
HFS		 3026 temp.s6_addr32[2] = (__force __be32)digest[0];
3027 temp.s6_addr32[3] = (__force __be32)digest[1];
622c81d5
HFS		 3028
3029 spin_unlock_bh(&lock);
3030
3031 if (ipv6_reserved_interfaceid(temp)) {
3032 dad_count++;
1855b7c3 3033 if (dad_count > dev_net(idev->dev)->ipv6.sysctl.idgen_retries)
622c81d5
HFS		 3034 return -1;
3035 goto retry;
3036 }
3037
3038 *address = temp;
3039 return 0;
3040}
3041
cc9da6cc
BM		 3042static void ipv6_gen_mode_random_init(struct inet6_dev *idev)
3043{
3044 struct ipv6_stable_secret *s = &idev->cnf.stable_secret;
3045
3046 if (s->initialized)
3047 return;
3048 s = &idev->cnf.stable_secret;
3049 get_random_bytes(&s->secret, sizeof(s->secret));
3050 s->initialized = true;
3051}
3052
bc91b0f0
JP		 3053static void addrconf_addr_gen(struct inet6_dev *idev, bool prefix_route)
3054{
622c81d5
HFS		 3055 struct in6_addr addr;
3056
ca254490
DA		 3057 /* no link local addresses on L3 master devices */
3058 if (netif_is_l3_master(idev->dev))
3059 return;
3060
622c81d5 3061 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
bc91b0f0 3062
cc9da6cc
BM		 3063 switch (idev->addr_gen_mode) {
3064 case IN6_ADDR_GEN_MODE_RANDOM:
3065 ipv6_gen_mode_random_init(idev);
3066 /* fallthrough */
3067 case IN6_ADDR_GEN_MODE_STABLE_PRIVACY:
622c81d5 3068 if (!ipv6_generate_stable_address(&addr, 0, idev))
64236f3f
HFS		 3069 addrconf_add_linklocal(idev, &addr,
3070 IFA_F_STABLE_PRIVACY);
622c81d5
HFS		 3071 else if (prefix_route)
3072 addrconf_prefix_route(&addr, 64, idev->dev, 0, 0);
cc9da6cc
BM		 3073 break;
3074 case IN6_ADDR_GEN_MODE_EUI64:
bc91b0f0
JP		 3075 /* addrconf_add_linklocal also adds a prefix_route and we
3076 * only need to care about prefix routes if ipv6_generate_eui64
3077 * couldn't generate one.
3078 */
3079 if (ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) == 0)
64236f3f 3080 addrconf_add_linklocal(idev, &addr, 0);
bc91b0f0
JP		 3081 else if (prefix_route)
3082 addrconf_prefix_route(&addr, 64, idev->dev, 0, 0);
cc9da6cc
BM		 3083 break;
3084 case IN6_ADDR_GEN_MODE_NONE:
3085 default:
3086 /* will not add any link local address */
3087 break;
bc91b0f0
JP		 3088 }
3089}
3090
1da177e4
LT		 3091static void addrconf_dev_config(struct net_device *dev)
3092{
8e5e8f30 3093 struct inet6_dev *idev;
1da177e4
LT		 3094
3095 ASSERT_RTNL();
3096
74235a25
HX		 3097 if ((dev->type != ARPHRD_ETHER) &&
3098 (dev->type != ARPHRD_FDDI) &&
74235a25 3099 (dev->type != ARPHRD_ARCNET) &&
06a4c1c5 3100 (dev->type != ARPHRD_INFINIBAND) &&
e837735e 3101 (dev->type != ARPHRD_IEEE1394) &&
e74bccb8 3102 (dev->type != ARPHRD_TUNNEL6) &&
cc9da6cc
BM		 3103 (dev->type != ARPHRD_6LOWPAN) &&
3104 (dev->type != ARPHRD_NONE)) {
74235a25
HX		 3105 /* Alas, we support only Ethernet autoconfiguration. */
3106 return;
3107 }
3108
1da177e4 3109 idev = addrconf_add_dev(dev);
64e724f6 3110 if (IS_ERR(idev))
1da177e4
LT		 3111 return;
3112
cc9da6cc
BM		 3113 /* this device type has no EUI support */
3114 if (dev->type == ARPHRD_NONE &&
3115 idev->addr_gen_mode == IN6_ADDR_GEN_MODE_EUI64)
3116 idev->addr_gen_mode = IN6_ADDR_GEN_MODE_RANDOM;
3117
bc91b0f0 3118 addrconf_addr_gen(idev, false);
1da177e4
LT		 3119}
3120
07a93626 3121#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4
LT		 3122static void addrconf_sit_config(struct net_device *dev)
3123{
3124 struct inet6_dev *idev;
3125
3126 ASSERT_RTNL();
3127
1ab1457c
YH		 3128 /*
3129 * Configure the tunnel with one of our IPv4
3130 * addresses... we should configure all of
1da177e4
LT		 3131 * our v4 addrs in the tunnel
3132 */
3133
e5d08d71 3134 idev = ipv6_find_idev(dev);
63159f29 3135 if (!idev) {
91df42be 3136 pr_debug("%s: add_dev failed\n", __func__);
1da177e4
LT		 3137 return;
3138 }
3139
c7dc89c0 3140 if (dev->priv_flags & IFF_ISATAP) {
bc91b0f0 3141 addrconf_addr_gen(idev, false);
c7dc89c0
FT		 3142 return;
3143 }
3144
1da177e4
LT		 3145 sit_add_v4_addrs(idev);
3146
62b54dd9 3147 if (dev->flags&IFF_POINTOPOINT)
1da177e4 3148 addrconf_add_mroute(dev);
1da177e4 3149}
0be669bb 3150#endif
1da177e4 3151
07a93626 3152#if IS_ENABLED(CONFIG_NET_IPGRE)
aee80b54 3153static void addrconf_gre_config(struct net_device *dev)
3154{
3155 struct inet6_dev *idev;
aee80b54 3156
aee80b54 3157 ASSERT_RTNL();
3158
e5d08d71 3159 idev = ipv6_find_idev(dev);
63159f29 3160 if (!idev) {
91df42be 3161 pr_debug("%s: add_dev failed\n", __func__);
aee80b54 3162 return;
3163 }
3164
bc91b0f0 3165 addrconf_addr_gen(idev, true);
d9e4ce65
HFS		 3166 if (dev->flags & IFF_POINTOPOINT)
3167 addrconf_add_mroute(dev);
aee80b54 3168}
3169#endif
3170
1ab1457c 3171static int addrconf_notify(struct notifier_block *this, unsigned long event,
351638e7 3172 void *ptr)
1da177e4 3173{
351638e7 3174 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
748e2d93 3175 struct inet6_dev *idev = __in6_dev_get(dev);
c5e33bdd 3176 int run_pending = 0;
b217d616 3177 int err;
1da177e4 3178
e21e8467 3179 switch (event) {
45ba9dd2 3180 case NETDEV_REGISTER:
74235a25 3181 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
45ba9dd2 3182 idev = ipv6_add_dev(dev);
a317a2f1
WC		 3183 if (IS_ERR(idev))
3184 return notifier_from_errno(PTR_ERR(idev));
45ba9dd2
YH		 3185 }
3186 break;
bcdd553f 3187
b7b0b1d2
AD		 3188 case NETDEV_CHANGEMTU:
3189 /* if MTU under IPV6_MIN_MTU stop IPv6 on this interface. */
3190 if (dev->mtu < IPV6_MIN_MTU) {
3191 addrconf_ifdown(dev, 1);
3192 break;
3193 }
3194
3195 if (idev) {
3196 rt6_mtu_change(dev, dev->mtu);
3197 idev->cnf.mtu6 = dev->mtu;
3198 break;
3199 }
3200
3201 /* allocate new idev */
3202 idev = ipv6_add_dev(dev);
3203 if (IS_ERR(idev))
3204 break;
3205
3206 /* device is still not ready */
3207 if (!(idev->if_flags & IF_READY))
3208 break;
3209
3210 run_pending = 1;
3211
3212 /* fall through */
3213
1da177e4 3214 case NETDEV_UP:
3c21edbd 3215 case NETDEV_CHANGE:
c2edacf8
JV		 3216 if (dev->flags & IFF_SLAVE)
3217 break;
3218
3ce62a84
WC		 3219 if (idev && idev->cnf.disable_ipv6)
3220 break;
3221
3c21edbd 3222 if (event == NETDEV_UP) {
f24e3d65 3223 if (!addrconf_qdisc_ok(dev)) {
3c21edbd 3224 /* device is not ready yet. */
f3213831 3225 pr_info("ADDRCONF(NETDEV_UP): %s: link is not ready\n",
3c21edbd
YH		 3226 dev->name);
3227 break;
3228 }
99081049 3229
d31c7b8f
EP		 3230 if (!idev && dev->mtu >= IPV6_MIN_MTU)
3231 idev = ipv6_add_dev(dev);
3232
a317a2f1 3233 if (!IS_ERR_OR_NULL(idev)) {
99081049 3234 idev->if_flags |= IF_READY;
e3ec6cfc
BT		 3235 run_pending = 1;
3236 }
b7b0b1d2 3237 } else if (event == NETDEV_CHANGE) {
f24e3d65 3238 if (!addrconf_qdisc_ok(dev)) {
3c21edbd
YH		 3239 /* device is still not ready. */
3240 break;
3241 }
3242
3243 if (idev) {
bcdd553f 3244 if (idev->if_flags & IF_READY)
3c21edbd
YH		 3245 /* device is already configured. */
3246 break;
3c21edbd
YH		 3247 idev->if_flags |= IF_READY;
3248 }
3249
f3213831
JP		 3250 pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n",
3251 dev->name);
3c21edbd 3252
c5e33bdd 3253 run_pending = 1;
3c21edbd
YH		 3254 }
3255
e21e8467 3256 switch (dev->type) {
07a93626 3257#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4
LT		 3258 case ARPHRD_SIT:
3259 addrconf_sit_config(dev);
3260 break;
aee80b54 3261#endif
07a93626 3262#if IS_ENABLED(CONFIG_NET_IPGRE)
aee80b54 3263 case ARPHRD_IPGRE:
3264 addrconf_gre_config(dev);
3265 break;
0be669bb 3266#endif
1da177e4
LT		 3267 case ARPHRD_LOOPBACK:
3268 init_loopback(dev);
3269 break;
3270
3271 default:
3272 addrconf_dev_config(dev);
3273 break;
3ff50b79 3274 }
bcdd553f 3275
a317a2f1 3276 if (!IS_ERR_OR_NULL(idev)) {
c5e33bdd
YH		 3277 if (run_pending)
3278 addrconf_dad_run(idev);
3279
bcdd553f
SH		 3280 /*
3281 * If the MTU changed during the interface down,
3282 * when the interface up, the changed MTU must be
3283 * reflected in the idev as well as routers.
1da177e4 3284 */
bcdd553f
SH		 3285 if (idev->cnf.mtu6 != dev->mtu &&
3286 dev->mtu >= IPV6_MIN_MTU) {
1da177e4
LT		 3287 rt6_mtu_change(dev, dev->mtu);
3288 idev->cnf.mtu6 = dev->mtu;
3289 }
3290 idev->tstamp = jiffies;
3291 inet6_ifinfo_notify(RTM_NEWLINK, idev);
bcdd553f
SH		 3292
3293 /*
3294 * If the changed mtu during down is lower than
3295 * IPV6_MIN_MTU stop IPv6 on this interface.
1da177e4
LT		 3296 */
3297 if (dev->mtu < IPV6_MIN_MTU)
bcdd553f 3298 addrconf_ifdown(dev, 1);
1da177e4
LT		 3299 }
3300 break;
3301
1da177e4
LT		 3302 case NETDEV_DOWN:
3303 case NETDEV_UNREGISTER:
3304 /*
3305 * Remove all addresses from this interface.
3306 */
3307 addrconf_ifdown(dev, event != NETDEV_DOWN);
3308 break;
3c21edbd 3309
1da177e4 3310 case NETDEV_CHANGENAME:
1da177e4 3311 if (idev) {
5632c515 3312 snmp6_unregister_dev(idev);
408c4768 3313 addrconf_sysctl_unregister(idev);
a317a2f1 3314 err = addrconf_sysctl_register(idev);
b217d616
HX		 3315 if (err)
3316 return notifier_from_errno(err);
a317a2f1
WC		 3317 err = snmp6_register_dev(idev);
3318 if (err) {
3319 addrconf_sysctl_unregister(idev);
3320 return notifier_from_errno(err);
3321 }
5632c515 3322 }
1da177e4 3323 break;
bcdd553f 3324
93d9b7d7
JP		 3325 case NETDEV_PRE_TYPE_CHANGE:
3326 case NETDEV_POST_TYPE_CHANGE:
3ef0952c
AL		 3327 if (idev)
3328 addrconf_type_change(dev, event);
75c78500 3329 break;
3ff50b79 3330 }
1da177e4
LT		 3331
3332 return NOTIFY_OK;
3333}
3334
3335/*
3336 * addrconf module should be notified of a device going up
3337 */
3338static struct notifier_block ipv6_dev_notf = {
3339 .notifier_call = addrconf_notify,
1da177e4
LT		 3340};
3341
93d9b7d7 3342static void addrconf_type_change(struct net_device *dev, unsigned long event)
75c78500
MS		 3343{
3344 struct inet6_dev *idev;
3345 ASSERT_RTNL();
3346
3347 idev = __in6_dev_get(dev);
3348
93d9b7d7 3349 if (event == NETDEV_POST_TYPE_CHANGE)
75c78500 3350 ipv6_mc_remap(idev);
93d9b7d7 3351 else if (event == NETDEV_PRE_TYPE_CHANGE)
75c78500
MS		 3352 ipv6_mc_unmap(idev);
3353}
3354
1da177e4
LT		 3355static int addrconf_ifdown(struct net_device *dev, int how)
3356{
c346dca1 3357 struct net *net = dev_net(dev);
502a2ffd 3358 struct inet6_dev *idev;
3359 struct inet6_ifaddr *ifa;
73a8bd74 3360 int state, i;
1da177e4
LT		 3361
3362 ASSERT_RTNL();
3363
73a8bd74
DM		 3364 rt6_ifdown(net, dev);
3365 neigh_ifdown(&nd_tbl, dev);
1da177e4
LT		 3366
3367 idev = __in6_dev_get(dev);
63159f29 3368 if (!idev)
1da177e4
LT		 3369 return -ENODEV;
3370
bcdd553f
SH		 3371 /*
3372 * Step 1: remove reference to ipv6 device from parent device.
3373 * Do not dev_put!
1da177e4 3374 */
439e2385 3375 if (how) {
1da177e4 3376 idev->dead = 1;
8814c4b5
YH		 3377
3378 /* protected by rtnl_lock */
a9b3cd7f 3379 RCU_INIT_POINTER(dev->ip6_ptr, NULL);
1da177e4
LT		 3380
3381 /* Step 1.5: remove snmp6 entry */
3382 snmp6_unregister_dev(idev);
3383
3384 }
3385
73a8bd74
DM		 3386 /* Step 2: clear hash table */
3387 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3388 struct hlist_head *h = &inet6_addr_lst[i];
73a8bd74
DM		 3389
3390 spin_lock_bh(&addrconf_hash_lock);
67ba4152 3391restart:
b67bfe0d 3392 hlist_for_each_entry_rcu(ifa, h, addr_lst) {
73a8bd74
DM		 3393 if (ifa->idev == idev) {
3394 hlist_del_init_rcu(&ifa->addr_lst);
c15b1cca 3395 addrconf_del_dad_work(ifa);
73a8bd74
DM		 3396 goto restart;
3397 }
3398 }
3399 spin_unlock_bh(&addrconf_hash_lock);
3400 }
3401
1da177e4
LT		 3402 write_lock_bh(&idev->lock);
3403
b7b1bfce
HFS		 3404 addrconf_del_rs_timer(idev);
3405
bcdd553f 3406 /* Step 2: clear flags for stateless addrconf */
439e2385 3407 if (!how)
3c21edbd 3408 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
1da177e4 3409
439e2385 3410 if (how && del_timer(&idev->regen_timer))
1da177e4
LT		 3411 in6_dev_put(idev);
3412
bcdd553f 3413 /* Step 3: clear tempaddr list */
372e6c8f 3414 while (!list_empty(&idev->tempaddr_list)) {
3415 ifa = list_first_entry(&idev->tempaddr_list,
3416 struct inet6_ifaddr, tmp_list);
3417 list_del(&ifa->tmp_list);
1da177e4
LT		 3418 write_unlock_bh(&idev->lock);
3419 spin_lock_bh(&ifa->lock);
3420
3421 if (ifa->ifpub) {
3422 in6_ifa_put(ifa->ifpub);
3423 ifa->ifpub = NULL;
3424 }
3425 spin_unlock_bh(&ifa->lock);
3426 in6_ifa_put(ifa);
3427 write_lock_bh(&idev->lock);
3428 }
8f37ada5 3429
502a2ffd 3430 while (!list_empty(&idev->addr_list)) {
3431 ifa = list_first_entry(&idev->addr_list,
3432 struct inet6_ifaddr, if_list);
c15b1cca 3433 addrconf_del_dad_work(ifa);
84e8b803 3434
73a8bd74 3435 list_del(&ifa->if_list);
84e8b803 3436
73a8bd74 3437 write_unlock_bh(&idev->lock);
84e8b803 3438
8e8e676d 3439 spin_lock_bh(&ifa->lock);
73a8bd74
DM		 3440 state = ifa->state;
3441 ifa->state = INET6_IFADDR_STATE_DEAD;
8e8e676d 3442 spin_unlock_bh(&ifa->lock);
9d82ca98 3443
73a8bd74
DM		 3444 if (state != INET6_IFADDR_STATE_DEAD) {
3445 __ipv6_ifa_notify(RTM_DELADDR, ifa);
f88c91dd 3446 inet6addr_notifier_call_chain(NETDEV_DOWN, ifa);
27bdb2ab 3447 }
73a8bd74 3448 in6_ifa_put(ifa);
8f37ada5 3449
73a8bd74
DM		 3450 write_lock_bh(&idev->lock);
3451 }
8f37ada5 3452
1da177e4
LT		 3453 write_unlock_bh(&idev->lock);
3454
381f4dca
SD		 3455 /* Step 5: Discard anycast and multicast list */
3456 if (how) {
3457 ipv6_ac_destroy_dev(idev);
1da177e4 3458 ipv6_mc_destroy_dev(idev);
381f4dca 3459 } else {
1da177e4 3460 ipv6_mc_down(idev);
381f4dca 3461 }
1da177e4 3462
1da177e4 3463 idev->tstamp = jiffies;
1ab1457c 3464
bcdd553f 3465 /* Last: Shot the device (if unregistered) */
439e2385 3466 if (how) {
408c4768 3467 addrconf_sysctl_unregister(idev);
1da177e4
LT		 3468 neigh_parms_release(&nd_tbl, idev->nd_parms);
3469 neigh_ifdown(&nd_tbl, dev);
3470 in6_dev_put(idev);
3471 }
3472 return 0;
3473}
3474
3475static void addrconf_rs_timer(unsigned long data)
3476{
b7b1bfce 3477 struct inet6_dev *idev = (struct inet6_dev *)data;
caf92bc4 3478 struct net_device *dev = idev->dev;
b7b1bfce 3479 struct in6_addr lladdr;
1da177e4 3480
b7b1bfce 3481 write_lock(&idev->lock);
5b2a1953 3482 if (idev->dead || !(idev->if_flags & IF_READY))
1da177e4
LT		 3483 goto out;
3484
9ba2add3 3485 if (!ipv6_accept_ra(idev))
5b2a1953 3486 goto out;
3487
3488 /* Announcement received after solicitation was sent */
3489 if (idev->if_flags & IF_RA_RCVD)
1da177e4 3490 goto out;
1da177e4 3491
b7b1bfce 3492 if (idev->rs_probes++ < idev->cnf.rtr_solicits) {
caf92bc4
CW		 3493 write_unlock(&idev->lock);
3494 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
3495 ndisc_send_rs(dev, &lladdr,
b7b1bfce
HFS		 3496 &in6addr_linklocal_allrouters);
3497 else
caf92bc4 3498 goto put;
1da177e4 3499
caf92bc4 3500 write_lock(&idev->lock);
b7b1bfce
HFS		 3501 /* The wait after the last probe can be shorter */
3502 addrconf_mod_rs_timer(idev, (idev->rs_probes ==
3503 idev->cnf.rtr_solicits) ?
3504 idev->cnf.rtr_solicit_delay :
3505 idev->cnf.rtr_solicit_interval);
1da177e4 3506 } else {
1da177e4
LT		 3507 /*
3508 * Note: we do not support deprecated "all on-link"
3509 * assumption any longer.
3510 */
91df42be 3511 pr_debug("%s: no IPv6 routers present\n", idev->dev->name);
1da177e4
LT		 3512 }
3513
3514out:
b7b1bfce 3515 write_unlock(&idev->lock);
caf92bc4 3516put:
b7b1bfce 3517 in6_dev_put(idev);
1da177e4
LT		 3518}
3519
3520/*
3521 * Duplicate Address Detection
3522 */
3c21edbd
YH		 3523static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
3524{
3525 unsigned long rand_num;
3526 struct inet6_dev *idev = ifp->idev;
3527
95c385b4
NH		 3528 if (ifp->flags & IFA_F_OPTIMISTIC)
3529 rand_num = 0;
3530 else
63862b5b 3531 rand_num = prandom_u32() % (idev->cnf.rtr_solicit_delay ? : 1);
95c385b4 3532
b7b1bfce 3533 ifp->dad_probes = idev->cnf.dad_transmits;
c15b1cca 3534 addrconf_mod_dad_work(ifp, rand_num);
3c21edbd
YH		 3535}
3536
c15b1cca 3537static void addrconf_dad_begin(struct inet6_ifaddr *ifp)
1da177e4
LT		 3538{
3539 struct inet6_dev *idev = ifp->idev;
3540 struct net_device *dev = idev->dev;
1da177e4
LT		 3541
3542 addrconf_join_solict(dev, &ifp->addr);
3543
63862b5b 3544 prandom_seed((__force u32) ifp->addr.s6_addr32[3]);
1da177e4
LT		 3545
3546 read_lock_bh(&idev->lock);
622ccdf1 3547 spin_lock(&ifp->lock);
e9d3e084 3548 if (ifp->state == INET6_IFADDR_STATE_DEAD)
1da177e4 3549 goto out;
1da177e4
LT		 3550
3551 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
1b34be74 3552 idev->cnf.accept_dad < 1 ||
55ebaef1
NT		 3553 !(ifp->flags&IFA_F_TENTATIVE) ||
3554 ifp->flags & IFA_F_NODAD) {
cc411d0b 3555 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
21809faf 3556 spin_unlock(&ifp->lock);
1da177e4
LT		 3557 read_unlock_bh(&idev->lock);
3558
3559 addrconf_dad_completed(ifp);
3560 return;
3561 }
3562
6732bade 3563 if (!(idev->if_flags & IF_READY)) {
21809faf 3564 spin_unlock(&ifp->lock);
6732bade 3565 read_unlock_bh(&idev->lock);
3c21edbd 3566 /*
590a9887 3567 * If the device is not ready:
3c21edbd
YH		 3568 * - keep it tentative if it is a permanent address.
3569 * - otherwise, kill it.
3570 */
3571 in6_ifa_hold(ifp);
cc411d0b 3572 addrconf_dad_stop(ifp, 0);
6732bade 3573 return;
3c21edbd 3574 }
95c385b4
NH		 3575
3576 /*
3577 * Optimistic nodes can start receiving
3578 * Frames right away
3579 */
7fd2561e 3580 if (ifp->flags & IFA_F_OPTIMISTIC) {
95c385b4 3581 ip6_ins_rt(ifp->rt);
7fd2561e
EK		 3582 if (ipv6_use_optimistic_addr(idev)) {
3583 /* Because optimistic nodes can use this address,
3584 * notify listeners. If DAD fails, RTM_DELADDR is sent.
3585 */
3586 ipv6_ifa_notify(RTM_NEWADDR, ifp);
3587 }
3588 }
95c385b4 3589
6732bade 3590 addrconf_dad_kick(ifp);
1da177e4 3591out:
622ccdf1 3592 spin_unlock(&ifp->lock);
1da177e4
LT		 3593 read_unlock_bh(&idev->lock);
3594}
3595
c15b1cca 3596static void addrconf_dad_start(struct inet6_ifaddr *ifp)
1da177e4 3597{
c15b1cca
HFS		 3598 bool begin_dad = false;
3599
8e8e676d 3600 spin_lock_bh(&ifp->lock);
c15b1cca
HFS		 3601 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
3602 ifp->state = INET6_IFADDR_STATE_PREDAD;
3603 begin_dad = true;
3604 }
8e8e676d 3605 spin_unlock_bh(&ifp->lock);
c15b1cca
HFS		 3606
3607 if (begin_dad)
3608 addrconf_mod_dad_work(ifp, 0);
3609}
3610
3611static void addrconf_dad_work(struct work_struct *w)
3612{
3613 struct inet6_ifaddr *ifp = container_of(to_delayed_work(w),
3614 struct inet6_ifaddr,
3615 dad_work);
1da177e4 3616 struct inet6_dev *idev = ifp->idev;
1da177e4
LT		 3617 struct in6_addr mcaddr;
3618
c15b1cca
HFS		 3619 enum {
3620 DAD_PROCESS,
3621 DAD_BEGIN,
3622 DAD_ABORT,
3623 } action = DAD_PROCESS;
3624
3625 rtnl_lock();
3626
8e8e676d 3627 spin_lock_bh(&ifp->lock);
c15b1cca
HFS		 3628 if (ifp->state == INET6_IFADDR_STATE_PREDAD) {
3629 action = DAD_BEGIN;
3630 ifp->state = INET6_IFADDR_STATE_DAD;
3631 } else if (ifp->state == INET6_IFADDR_STATE_ERRDAD) {
3632 action = DAD_ABORT;
3633 ifp->state = INET6_IFADDR_STATE_POSTDAD;
3634 }
8e8e676d 3635 spin_unlock_bh(&ifp->lock);
c15b1cca
HFS		 3636
3637 if (action == DAD_BEGIN) {
3638 addrconf_dad_begin(ifp);
3639 goto out;
3640 } else if (action == DAD_ABORT) {
3641 addrconf_dad_stop(ifp, 1);
3642 goto out;
3643 }
3644
b7b1bfce 3645 if (!ifp->dad_probes && addrconf_dad_end(ifp))
f2344a13
HX		 3646 goto out;
3647
c15b1cca 3648 write_lock_bh(&idev->lock);
122e4519 3649 if (idev->dead || !(idev->if_flags & IF_READY)) {
c15b1cca 3650 write_unlock_bh(&idev->lock);
1da177e4
LT		 3651 goto out;
3652 }
21809faf 3653
3654 spin_lock(&ifp->lock);
622ccdf1
HX		 3655 if (ifp->state == INET6_IFADDR_STATE_DEAD) {
3656 spin_unlock(&ifp->lock);
c15b1cca 3657 write_unlock_bh(&idev->lock);
622ccdf1
HX		 3658 goto out;
3659 }
3660
b7b1bfce 3661 if (ifp->dad_probes == 0) {
1da177e4
LT		 3662 /*
3663 * DAD was successful
3664 */
3665
cc411d0b 3666 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
21809faf 3667 spin_unlock(&ifp->lock);
c15b1cca 3668 write_unlock_bh(&idev->lock);
1da177e4
LT		 3669
3670 addrconf_dad_completed(ifp);
3671
3672 goto out;
3673 }
3674
b7b1bfce 3675 ifp->dad_probes--;
c15b1cca
HFS		 3676 addrconf_mod_dad_work(ifp,
3677 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME));
21809faf 3678 spin_unlock(&ifp->lock);
c15b1cca 3679 write_unlock_bh(&idev->lock);
1da177e4
LT		 3680
3681 /* send a neighbour solicitation for our addr */
1da177e4 3682 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
304d888b 3683 ndisc_send_ns(ifp->idev->dev, &ifp->addr, &mcaddr, &in6addr_any);
1da177e4
LT		 3684out:
3685 in6_ifa_put(ifp);
c15b1cca 3686 rtnl_unlock();
1da177e4
LT		 3687}
3688
11ffff75
HFS		 3689/* ifp->idev must be at least read locked */
3690static bool ipv6_lonely_lladdr(struct inet6_ifaddr *ifp)
3691{
3692 struct inet6_ifaddr *ifpiter;
3693 struct inet6_dev *idev = ifp->idev;
3694
602582ca
HFS		 3695 list_for_each_entry_reverse(ifpiter, &idev->addr_list, if_list) {
3696 if (ifpiter->scope > IFA_LINK)
3697 break;
11ffff75
HFS		 3698 if (ifp != ifpiter && ifpiter->scope == IFA_LINK &&
3699 (ifpiter->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE|
3700 IFA_F_OPTIMISTIC|IFA_F_DADFAILED)) ==
3701 IFA_F_PERMANENT)
3702 return false;
3703 }
3704 return true;
3705}
3706
1da177e4
LT		 3707static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
3708{
e21e8467 3709 struct net_device *dev = ifp->idev->dev;
b7b1bfce 3710 struct in6_addr lladdr;
b173ee48 3711 bool send_rs, send_mld;
b7b1bfce 3712
c15b1cca 3713 addrconf_del_dad_work(ifp);
1da177e4
LT		 3714
3715 /*
3716 * Configure the address for reception. Now it is valid.
3717 */
3718
3719 ipv6_ifa_notify(RTM_NEWADDR, ifp);
3720
026359bc
TA		 3721 /* If added prefix is link local and we are prepared to process
3722 router advertisements, start sending router solicitations.
1da177e4
LT		 3723 */
3724
1ec047eb 3725 read_lock_bh(&ifp->idev->lock);
11ffff75 3726 send_mld = ifp->scope == IFA_LINK && ipv6_lonely_lladdr(ifp);
b173ee48
HFS		 3727 send_rs = send_mld &&
3728 ipv6_accept_ra(ifp->idev) &&
1ec047eb 3729 ifp->idev->cnf.rtr_solicits > 0 &&
b173ee48 3730 (dev->flags&IFF_LOOPBACK) == 0;
1ec047eb
HFS		 3731 read_unlock_bh(&ifp->idev->lock);
3732
b173ee48
HFS		 3733 /* While dad is in progress mld report's source address is in6_addrany.
3734 * Resend with proper ll now.
3735 */
3736 if (send_mld)
3737 ipv6_mc_dad_complete(ifp->idev);
3738
1ec047eb 3739 if (send_rs) {
1da177e4
LT		 3740 /*
3741 * If a host as already performed a random delay
3742 * [...] as part of DAD [...] there is no need
3743 * to delay again before sending the first RS
3744 */
1ec047eb 3745 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
b7b1bfce 3746 return;
1ec047eb 3747 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters);
1da177e4 3748
b7b1bfce
HFS		 3749 write_lock_bh(&ifp->idev->lock);
3750 spin_lock(&ifp->lock);
3751 ifp->idev->rs_probes = 1;
1da177e4 3752 ifp->idev->if_flags |= IF_RS_SENT;
b7b1bfce
HFS		 3753 addrconf_mod_rs_timer(ifp->idev,
3754 ifp->idev->cnf.rtr_solicit_interval);
3755 spin_unlock(&ifp->lock);
3756 write_unlock_bh(&ifp->idev->lock);
1da177e4
LT		 3757 }
3758}
3759
e21e8467
SH		 3760static void addrconf_dad_run(struct inet6_dev *idev)
3761{
c5e33bdd
YH		 3762 struct inet6_ifaddr *ifp;
3763
3764 read_lock_bh(&idev->lock);
502a2ffd 3765 list_for_each_entry(ifp, &idev->addr_list, if_list) {
21809faf 3766 spin_lock(&ifp->lock);
f2344a13
HX		 3767 if (ifp->flags & IFA_F_TENTATIVE &&
3768 ifp->state == INET6_IFADDR_STATE_DAD)
3769 addrconf_dad_kick(ifp);
21809faf 3770 spin_unlock(&ifp->lock);
c5e33bdd
YH		 3771 }
3772 read_unlock_bh(&idev->lock);
3773}
3774
1da177e4
LT		 3775#ifdef CONFIG_PROC_FS
3776struct if6_iter_state {
3c40090a 3777 struct seq_net_private p;
1da177e4 3778 int bucket;
1d578303 3779 int offset;
1da177e4
LT		 3780};
3781
1d578303 3782static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos)
1da177e4
LT		 3783{
3784 struct inet6_ifaddr *ifa = NULL;
3785 struct if6_iter_state *state = seq->private;
1218854a 3786 struct net *net = seq_file_net(seq);
1d578303 3787 int p = 0;
1da177e4 3788
1d578303
MM		 3789 /* initial bucket if pos is 0 */
3790 if (pos == 0) {
3791 state->bucket = 0;
3792 state->offset = 0;
3793 }
3794
3795 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
b67bfe0d 3796 hlist_for_each_entry_rcu_bh(ifa, &inet6_addr_lst[state->bucket],
1d578303 3797 addr_lst) {
9f0d3c27
ED		 3798 if (!net_eq(dev_net(ifa->idev->dev), net))
3799 continue;
1d578303
MM		 3800 /* sync with offset */
3801 if (p < state->offset) {
3802 p++;
3803 continue;
3804 }
3805 state->offset++;
9f0d3c27 3806 return ifa;
1d578303
MM		 3807 }
3808
3809 /* prepare for next bucket */
3810 state->offset = 0;
3811 p = 0;
1da177e4 3812 }
c2e21293 3813 return NULL;
1da177e4
LT		 3814}
3815
c2e21293 3816static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
3817 struct inet6_ifaddr *ifa)
1da177e4
LT		 3818{
3819 struct if6_iter_state *state = seq->private;
1218854a 3820 struct net *net = seq_file_net(seq);
1da177e4 3821
b67bfe0d 3822 hlist_for_each_entry_continue_rcu_bh(ifa, addr_lst) {
9f0d3c27
ED		 3823 if (!net_eq(dev_net(ifa->idev->dev), net))
3824 continue;
1d578303 3825 state->offset++;
9f0d3c27 3826 return ifa;
1d578303 3827 }
3c40090a 3828
c2e21293 3829 while (++state->bucket < IN6_ADDR_HSIZE) {
1d578303 3830 state->offset = 0;
b67bfe0d 3831 hlist_for_each_entry_rcu_bh(ifa,
c2e21293 3832 &inet6_addr_lst[state->bucket], addr_lst) {
9f0d3c27
ED		 3833 if (!net_eq(dev_net(ifa->idev->dev), net))
3834 continue;
1d578303 3835 state->offset++;
9f0d3c27 3836 return ifa;
c2e21293 3837 }
1da177e4 3838 }
3c40090a 3839
c2e21293 3840 return NULL;
1da177e4
LT		 3841}
3842
1da177e4 3843static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
4f70ecca 3844 __acquires(rcu_bh)
1da177e4 3845{
5c578aed 3846 rcu_read_lock_bh();
1d578303 3847 return if6_get_first(seq, *pos);
1da177e4
LT		 3848}
3849
3850static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3851{
3852 struct inet6_ifaddr *ifa;
3853
3854 ifa = if6_get_next(seq, v);
3855 ++*pos;
3856 return ifa;
3857}
3858
3859static void if6_seq_stop(struct seq_file *seq, void *v)
4f70ecca 3860 __releases(rcu_bh)
1da177e4 3861{
5c578aed 3862 rcu_read_unlock_bh();
1da177e4
LT		 3863}
3864
3865static int if6_seq_show(struct seq_file *seq, void *v)
3866{
3867 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
971a351c 3868 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
b071195d 3869 &ifp->addr,
1da177e4
LT		 3870 ifp->idev->dev->ifindex,
3871 ifp->prefix_len,
3872 ifp->scope,
971a351c 3873 (u8) ifp->flags,
1da177e4
LT		 3874 ifp->idev->dev->name);
3875 return 0;
3876}
3877
56b3d975 3878static const struct seq_operations if6_seq_ops = {
1da177e4
LT		 3879 .start = if6_seq_start,
3880 .next = if6_seq_next,
3881 .show = if6_seq_show,
3882 .stop = if6_seq_stop,
3883};
3884
3885static int if6_seq_open(struct inode *inode, struct file *file)
3886{
3c40090a
DL		 3887 return seq_open_net(inode, file, &if6_seq_ops,
3888 sizeof(struct if6_iter_state));
1da177e4
LT		 3889}
3890
9a32144e 3891static const struct file_operations if6_fops = {
1da177e4
LT		 3892 .owner = THIS_MODULE,
3893 .open = if6_seq_open,
3894 .read = seq_read,
3895 .llseek = seq_lseek,
3c40090a 3896 .release = seq_release_net,
1da177e4
LT		 3897};
3898
2c8c1e72 3899static int __net_init if6_proc_net_init(struct net *net)
1da177e4 3900{
d4beaa66 3901 if (!proc_create("if_inet6", S_IRUGO, net->proc_net, &if6_fops))
1da177e4
LT		 3902 return -ENOMEM;
3903 return 0;
3904}
3905
2c8c1e72 3906static void __net_exit if6_proc_net_exit(struct net *net)
3c40090a 3907{
ece31ffd 3908 remove_proc_entry("if_inet6", net->proc_net);
3c40090a
DL		 3909}
3910
3911static struct pernet_operations if6_proc_net_ops = {
67ba4152
IM		 3912 .init = if6_proc_net_init,
3913 .exit = if6_proc_net_exit,
3c40090a
DL		 3914};
3915
3916int __init if6_proc_init(void)
3917{
3918 return register_pernet_subsys(&if6_proc_net_ops);
3919}
3920
1da177e4
LT		 3921void if6_proc_exit(void)
3922{
3c40090a 3923 unregister_pernet_subsys(&if6_proc_net_ops);
1da177e4
LT		 3924}
3925#endif /* CONFIG_PROC_FS */
3926
07a93626 3927#if IS_ENABLED(CONFIG_IPV6_MIP6)
3b9f9a1c 3928/* Check if address is a home address configured on any interface. */
b71d1d42 3929int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr)
3b9f9a1c
NT		 3930{
3931 int ret = 0;
c2e21293 3932 struct inet6_ifaddr *ifp = NULL;
ddbe5032 3933 unsigned int hash = inet6_addr_hash(addr);
c2e21293 3934
5c578aed 3935 rcu_read_lock_bh();
b67bfe0d 3936 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
878628fb 3937 if (!net_eq(dev_net(ifp->idev->dev), net))
389f6612 3938 continue;
caad295f 3939 if (ipv6_addr_equal(&ifp->addr, addr) &&
3b9f9a1c
NT		 3940 (ifp->flags & IFA_F_HOMEADDRESS)) {
3941 ret = 1;
3942 break;
3943 }
3944 }
5c578aed 3945 rcu_read_unlock_bh();
3b9f9a1c
NT		 3946 return ret;
3947}
3948#endif
3949
1da177e4
LT		 3950/*
3951 * Periodic address status verification
3952 */
3953
c15b1cca 3954static void addrconf_verify_rtnl(void)
1da177e4 3955{
b2db7564 3956 unsigned long now, next, next_sec, next_sched;
1da177e4 3957 struct inet6_ifaddr *ifp;
1da177e4
LT		 3958 int i;
3959
c15b1cca
HFS		 3960 ASSERT_RTNL();
3961
5c578aed 3962 rcu_read_lock_bh();
1da177e4 3963 now = jiffies;
b2db7564 3964 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
1da177e4 3965
c15b1cca 3966 cancel_delayed_work(&addr_chk_work);
1da177e4 3967
bcdd553f 3968 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
1da177e4 3969restart:
c15b1cca 3970 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[i], addr_lst) {
1da177e4 3971 unsigned long age;
1da177e4 3972
fad8da3e
YA		 3973 /* When setting preferred_lft to a value not zero or
3974 * infinity, while valid_lft is infinity
3975 * IFA_F_PERMANENT has a non-infinity life time.
3976 */
3977 if ((ifp->flags & IFA_F_PERMANENT) &&
3978 (ifp->prefered_lft == INFINITY_LIFE_TIME))
1da177e4
LT		 3979 continue;
3980
3981 spin_lock(&ifp->lock);
b2db7564
YH		 3982 /* We try to batch several events at once. */
3983 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
1da177e4 3984
8f27ebb9
YH		 3985 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
3986 age >= ifp->valid_lft) {
1da177e4
LT		 3987 spin_unlock(&ifp->lock);
3988 in6_ifa_hold(ifp);
1da177e4
LT		 3989 ipv6_del_addr(ifp);
3990 goto restart;
8f27ebb9
YH		 3991 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
3992 spin_unlock(&ifp->lock);
3993 continue;
1da177e4 3994 } else if (age >= ifp->prefered_lft) {
a1ed0526 3995 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
1da177e4
LT		 3996 int deprecate = 0;
3997
3998 if (!(ifp->flags&IFA_F_DEPRECATED)) {
3999 deprecate = 1;
4000 ifp->flags |= IFA_F_DEPRECATED;
4001 }
4002
fad8da3e
YA		 4003 if ((ifp->valid_lft != INFINITY_LIFE_TIME) &&
4004 (time_before(ifp->tstamp + ifp->valid_lft * HZ, next)))
1da177e4
LT		 4005 next = ifp->tstamp + ifp->valid_lft * HZ;
4006
4007 spin_unlock(&ifp->lock);
4008
4009 if (deprecate) {
4010 in6_ifa_hold(ifp);
1da177e4
LT		 4011
4012 ipv6_ifa_notify(0, ifp);
4013 in6_ifa_put(ifp);
4014 goto restart;
4015 }
1da177e4
LT		 4016 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
4017 !(ifp->flags&IFA_F_TENTATIVE)) {
88949cf4 4018 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
4019 ifp->idev->cnf.dad_transmits *
1f9248e5 4020 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME) / HZ;
88949cf4 4021
1da177e4
LT		 4022 if (age >= ifp->prefered_lft - regen_advance) {
4023 struct inet6_ifaddr *ifpub = ifp->ifpub;
4024 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
4025 next = ifp->tstamp + ifp->prefered_lft * HZ;
4026 if (!ifp->regen_count && ifpub) {
4027 ifp->regen_count++;
4028 in6_ifa_hold(ifp);
4029 in6_ifa_hold(ifpub);
4030 spin_unlock(&ifp->lock);
5c578aed 4031
291d809b
HY		 4032 spin_lock(&ifpub->lock);
4033 ifpub->regen_count = 0;
4034 spin_unlock(&ifpub->lock);
1da177e4
LT		 4035 ipv6_create_tempaddr(ifpub, ifp);
4036 in6_ifa_put(ifpub);
4037 in6_ifa_put(ifp);
4038 goto restart;
4039 }
4040 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
4041 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
4042 spin_unlock(&ifp->lock);
1da177e4
LT		 4043 } else {
4044 /* ifp->prefered_lft <= ifp->valid_lft */
4045 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
4046 next = ifp->tstamp + ifp->prefered_lft * HZ;
4047 spin_unlock(&ifp->lock);
4048 }
4049 }
1da177e4
LT		 4050 }
4051
b2db7564
YH		 4052 next_sec = round_jiffies_up(next);
4053 next_sched = next;
4054
4055 /* If rounded timeout is accurate enough, accept it. */
4056 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
4057 next_sched = next_sec;
4058
4059 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
4060 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
4061 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
4062
ba3542e1 4063 ADBG(KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
4064 now, next, next_sec, next_sched);
c15b1cca 4065 mod_delayed_work(addrconf_wq, &addr_chk_work, next_sched - now);
5c578aed 4066 rcu_read_unlock_bh();
1da177e4
LT		 4067}
4068
c15b1cca
HFS		 4069static void addrconf_verify_work(struct work_struct *w)
4070{
4071 rtnl_lock();
4072 addrconf_verify_rtnl();
4073 rtnl_unlock();
4074}
4075
4076static void addrconf_verify(void)
4077{
4078 mod_delayed_work(addrconf_wq, &addr_chk_work, 0);
4079}
4080
caeaba79
ND		 4081static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local,
4082 struct in6_addr **peer_pfx)
461d8837
TG		 4083{
4084 struct in6_addr *pfx = NULL;
4085
caeaba79
ND		 4086 *peer_pfx = NULL;
4087
461d8837
TG		 4088 if (addr)
4089 pfx = nla_data(addr);
4090
4091 if (local) {
4092 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
caeaba79
ND		 4093 *peer_pfx = pfx;
4094 pfx = nla_data(local);
461d8837
TG		 4095 }
4096
4097 return pfx;
4098}
4099
ef7c79ed 4100static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
461d8837
TG		 4101 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
4102 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
4103 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
479840ff 4104 [IFA_FLAGS] = { .len = sizeof(u32) },
461d8837
TG		 4105};
4106
1da177e4 4107static int
661d2967 4108inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh)
1da177e4 4109{
3b1e0a65 4110 struct net *net = sock_net(skb->sk);
b933f716
TG		 4111 struct ifaddrmsg *ifm;
4112 struct nlattr *tb[IFA_MAX+1];
caeaba79 4113 struct in6_addr *pfx, *peer_pfx;
6046d5b4 4114 u32 ifa_flags;
b933f716 4115 int err;
1da177e4 4116
b933f716
TG		 4117 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
4118 if (err < 0)
4119 return err;
4120
4121 ifm = nlmsg_data(nlh);
caeaba79 4122 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
63159f29 4123 if (!pfx)
1da177e4
LT		 4124 return -EINVAL;
4125
6046d5b4
HK		 4126 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
4127
4128 /* We ignore other flags so far. */
4129 ifa_flags &= IFA_F_MANAGETEMPADDR;
4130
4131 return inet6_addr_del(net, ifm->ifa_index, ifa_flags, pfx,
4132 ifm->ifa_prefixlen);
1da177e4
LT		 4133}
4134
479840ff 4135static int inet6_addr_modify(struct inet6_ifaddr *ifp, u32 ifa_flags,
55ebaef1 4136 u32 prefered_lft, u32 valid_lft)
081bba5b 4137{
6f704992
YH		 4138 u32 flags;
4139 clock_t expires;
4bed72e4 4140 unsigned long timeout;
53bd6749 4141 bool was_managetempaddr;
5b84efec 4142 bool had_prefixroute;
46d48046 4143
c15b1cca
HFS		 4144 ASSERT_RTNL();
4145
081bba5b
NT		 4146 if (!valid_lft || (prefered_lft > valid_lft))
4147 return -EINVAL;
4148
53bd6749
JP		 4149 if (ifa_flags & IFA_F_MANAGETEMPADDR &&
4150 (ifp->flags & IFA_F_TEMPORARY || ifp->prefix_len != 64))
4151 return -EINVAL;
4152
4bed72e4
YH		 4153 timeout = addrconf_timeout_fixup(valid_lft, HZ);
4154 if (addrconf_finite_timeout(timeout)) {
4155 expires = jiffies_to_clock_t(timeout * HZ);
4156 valid_lft = timeout;
6f704992 4157 flags = RTF_EXPIRES;
4bed72e4
YH		 4158 } else {
4159 expires = 0;
4160 flags = 0;
4161 ifa_flags |= IFA_F_PERMANENT;
6f704992 4162 }
081bba5b 4163
4bed72e4
YH		 4164 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
4165 if (addrconf_finite_timeout(timeout)) {
4166 if (timeout == 0)
4167 ifa_flags |= IFA_F_DEPRECATED;
4168 prefered_lft = timeout;
4169 }
081bba5b
NT		 4170
4171 spin_lock_bh(&ifp->lock);
53bd6749 4172 was_managetempaddr = ifp->flags & IFA_F_MANAGETEMPADDR;
5b84efec
TH		 4173 had_prefixroute = ifp->flags & IFA_F_PERMANENT &&
4174 !(ifp->flags & IFA_F_NOPREFIXROUTE);
53bd6749 4175 ifp->flags &= ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD |
761aac73
TH		 4176 IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
4177 IFA_F_NOPREFIXROUTE);
53bd6749 4178 ifp->flags |= ifa_flags;
081bba5b
NT		 4179 ifp->tstamp = jiffies;
4180 ifp->valid_lft = valid_lft;
4181 ifp->prefered_lft = prefered_lft;
4182
4183 spin_unlock_bh(&ifp->lock);
4184 if (!(ifp->flags&IFA_F_TENTATIVE))
4185 ipv6_ifa_notify(0, ifp);
081bba5b 4186
761aac73
TH		 4187 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) {
4188 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
4189 expires, flags);
5b84efec
TH		 4190 } else if (had_prefixroute) {
4191 enum cleanup_prefix_rt_t action;
4192 unsigned long rt_expires;
4193
4194 write_lock_bh(&ifp->idev->lock);
4195 action = check_cleanup_prefix_route(ifp, &rt_expires);
4196 write_unlock_bh(&ifp->idev->lock);
4197
4198 if (action != CLEANUP_PREFIX_RT_NOP) {
4199 cleanup_prefix_route(ifp, rt_expires,
4200 action == CLEANUP_PREFIX_RT_DEL);
4201 }
761aac73 4202 }
53bd6749
JP		 4203
4204 if (was_managetempaddr || ifp->flags & IFA_F_MANAGETEMPADDR) {
4205 if (was_managetempaddr && !(ifp->flags & IFA_F_MANAGETEMPADDR))
4206 valid_lft = prefered_lft = 0;
4207 manage_tempaddrs(ifp->idev, ifp, valid_lft, prefered_lft,
4208 !was_managetempaddr, jiffies);
4209 }
4210
c15b1cca 4211 addrconf_verify_rtnl();
081bba5b
NT		 4212
4213 return 0;
4214}
4215
1da177e4 4216static int
661d2967 4217inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh)
1da177e4 4218{
3b1e0a65 4219 struct net *net = sock_net(skb->sk);
461d8837
TG		 4220 struct ifaddrmsg *ifm;
4221 struct nlattr *tb[IFA_MAX+1];
caeaba79 4222 struct in6_addr *pfx, *peer_pfx;
7198f8ce
TG		 4223 struct inet6_ifaddr *ifa;
4224 struct net_device *dev;
55ebaef1 4225 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
479840ff 4226 u32 ifa_flags;
461d8837 4227 int err;
1da177e4 4228
461d8837
TG		 4229 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
4230 if (err < 0)
4231 return err;
4232
4233 ifm = nlmsg_data(nlh);
caeaba79 4234 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
63159f29 4235 if (!pfx)
1da177e4
LT		 4236 return -EINVAL;
4237
461d8837 4238 if (tb[IFA_CACHEINFO]) {
0778769d 4239 struct ifa_cacheinfo *ci;
461d8837
TG		 4240
4241 ci = nla_data(tb[IFA_CACHEINFO]);
0778769d 4242 valid_lft = ci->ifa_valid;
461d8837
TG		 4243 preferred_lft = ci->ifa_prefered;
4244 } else {
4245 preferred_lft = INFINITY_LIFE_TIME;
4246 valid_lft = INFINITY_LIFE_TIME;
0778769d
NT		 4247 }
4248
af284937 4249 dev = __dev_get_by_index(net, ifm->ifa_index);
63159f29 4250 if (!dev)
7198f8ce
TG		 4251 return -ENODEV;
4252
479840ff
JP		 4253 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
4254
55ebaef1 4255 /* We ignore other flags so far. */
761aac73 4256 ifa_flags &= IFA_F_NODAD | IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
93a714d6 4257 IFA_F_NOPREFIXROUTE | IFA_F_MCAUTOJOIN;
55ebaef1 4258
1cab3da6 4259 ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
63159f29 4260 if (!ifa) {
7198f8ce
TG		 4261 /*
4262 * It would be best to check for !NLM_F_CREATE here but
db9c7c39 4263 * userspace already relies on not having to provide this.
7198f8ce 4264 */
caeaba79 4265 return inet6_addr_add(net, ifm->ifa_index, pfx, peer_pfx,
af284937
DL		 4266 ifm->ifa_prefixlen, ifa_flags,
4267 preferred_lft, valid_lft);
081bba5b
NT		 4268 }
4269
7198f8ce
TG		 4270 if (nlh->nlmsg_flags & NLM_F_EXCL ||
4271 !(nlh->nlmsg_flags & NLM_F_REPLACE))
4272 err = -EEXIST;
4273 else
55ebaef1 4274 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
7198f8ce
TG		 4275
4276 in6_ifa_put(ifa);
4277
4278 return err;
1da177e4
LT		 4279}
4280
479840ff 4281static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u32 flags,
101bb229
TG		 4282 u8 scope, int ifindex)
4283{
4284 struct ifaddrmsg *ifm;
4285
4286 ifm = nlmsg_data(nlh);
4287 ifm->ifa_family = AF_INET6;
4288 ifm->ifa_prefixlen = prefixlen;
4289 ifm->ifa_flags = flags;
4290 ifm->ifa_scope = scope;
4291 ifm->ifa_index = ifindex;
4292}
4293
85486af0
TG		 4294static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
4295 unsigned long tstamp, u32 preferred, u32 valid)
4296{
4297 struct ifa_cacheinfo ci;
4298
18a31e1e
TG		 4299 ci.cstamp = cstamp_delta(cstamp);
4300 ci.tstamp = cstamp_delta(tstamp);
85486af0
TG		 4301 ci.ifa_prefered = preferred;
4302 ci.ifa_valid = valid;
4303
4304 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
4305}
4306
101bb229
TG		 4307static inline int rt_scope(int ifa_scope)
4308{
4309 if (ifa_scope & IFA_HOST)
4310 return RT_SCOPE_HOST;
4311 else if (ifa_scope & IFA_LINK)
4312 return RT_SCOPE_LINK;
4313 else if (ifa_scope & IFA_SITE)
4314 return RT_SCOPE_SITE;
4315 else
4316 return RT_SCOPE_UNIVERSE;
4317}
4318
0ab6803b
TG		 4319static inline int inet6_ifaddr_msgsize(void)
4320{
339bf98f 4321 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
caeaba79 4322 + nla_total_size(16) /* IFA_LOCAL */
339bf98f 4323 + nla_total_size(16) /* IFA_ADDRESS */
479840ff
JP		 4324 + nla_total_size(sizeof(struct ifa_cacheinfo))
4325 + nla_total_size(4) /* IFA_FLAGS */;
0ab6803b 4326}
c5396a31 4327
1da177e4 4328static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
15e47304 4329 u32 portid, u32 seq, int event, unsigned int flags)
1da177e4 4330{
1da177e4 4331 struct nlmsghdr *nlh;
85486af0 4332 u32 preferred, valid;
1da177e4 4333
15e47304 4334 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
63159f29 4335 if (!nlh)
26932566 4336 return -EMSGSIZE;
0ab6803b 4337
101bb229
TG		 4338 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
4339 ifa->idev->dev->ifindex);
4340
fad8da3e
YA		 4341 if (!((ifa->flags&IFA_F_PERMANENT) &&
4342 (ifa->prefered_lft == INFINITY_LIFE_TIME))) {
85486af0
TG		 4343 preferred = ifa->prefered_lft;
4344 valid = ifa->valid_lft;
4345 if (preferred != INFINITY_LIFE_TIME) {
1da177e4 4346 long tval = (jiffies - ifa->tstamp)/HZ;
a1faa698
JR		 4347 if (preferred > tval)
4348 preferred -= tval;
4349 else
4350 preferred = 0;
f56619fc
BH		 4351 if (valid != INFINITY_LIFE_TIME) {
4352 if (valid > tval)
4353 valid -= tval;
4354 else
4355 valid = 0;
4356 }
1da177e4
LT		 4357 }
4358 } else {
85486af0
TG		 4359 preferred = INFINITY_LIFE_TIME;
4360 valid = INFINITY_LIFE_TIME;
4361 }
4362
7996c799 4363 if (!ipv6_addr_any(&ifa->peer_addr)) {
930345ea
JB		 4364 if (nla_put_in6_addr(skb, IFA_LOCAL, &ifa->addr) < 0 ||
4365 nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->peer_addr) < 0)
caeaba79
ND		 4366 goto error;
4367 } else
930345ea 4368 if (nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->addr) < 0)
caeaba79
ND		 4369 goto error;
4370
4371 if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0)
4372 goto error;
1da177e4 4373
479840ff
JP		 4374 if (nla_put_u32(skb, IFA_FLAGS, ifa->flags) < 0)
4375 goto error;
4376
053c095a
JB		 4377 nlmsg_end(skb, nlh);
4378 return 0;
caeaba79
ND		 4379
4380error:
4381 nlmsg_cancel(skb, nlh);
4382 return -EMSGSIZE;
1da177e4
LT		 4383}
4384
4385static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
15e47304 4386 u32 portid, u32 seq, int event, u16 flags)
1da177e4 4387{
1da177e4 4388 struct nlmsghdr *nlh;
101bb229
TG		 4389 u8 scope = RT_SCOPE_UNIVERSE;
4390 int ifindex = ifmca->idev->dev->ifindex;
4391
4392 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
4393 scope = RT_SCOPE_SITE;
1da177e4 4394
15e47304 4395 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
63159f29 4396 if (!nlh)
26932566 4397 return -EMSGSIZE;
85486af0 4398
0ab6803b 4399 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
930345ea 4400 if (nla_put_in6_addr(skb, IFA_MULTICAST, &ifmca->mca_addr) < 0 ||
0ab6803b 4401 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
26932566
PM		 4402 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
4403 nlmsg_cancel(skb, nlh);
4404 return -EMSGSIZE;
4405 }
85486af0 4406
053c095a
JB		 4407 nlmsg_end(skb, nlh);
4408 return 0;
1da177e4
LT		 4409}
4410
4411static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
15e47304 4412 u32 portid, u32 seq, int event, unsigned int flags)
1da177e4 4413{
1da177e4 4414 struct nlmsghdr *nlh;
101bb229
TG		 4415 u8 scope = RT_SCOPE_UNIVERSE;
4416 int ifindex = ifaca->aca_idev->dev->ifindex;
4417
4418 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
4419 scope = RT_SCOPE_SITE;
1da177e4 4420
15e47304 4421 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
63159f29 4422 if (!nlh)
26932566 4423 return -EMSGSIZE;
85486af0 4424
0ab6803b 4425 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
930345ea 4426 if (nla_put_in6_addr(skb, IFA_ANYCAST, &ifaca->aca_addr) < 0 ||
0ab6803b 4427 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
26932566
PM		 4428 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
4429 nlmsg_cancel(skb, nlh);
4430 return -EMSGSIZE;
4431 }
1da177e4 4432
053c095a
JB		 4433 nlmsg_end(skb, nlh);
4434 return 0;
1da177e4
LT		 4435}
4436
e21e8467 4437enum addr_type_t {
1da177e4
LT		 4438 UNICAST_ADDR,
4439 MULTICAST_ADDR,
4440 ANYCAST_ADDR,
4441};
4442
234b27c3
ED		 4443/* called with rcu_read_lock() */
4444static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
4445 struct netlink_callback *cb, enum addr_type_t type,
4446 int s_ip_idx, int *p_ip_idx)
4447{
234b27c3
ED		 4448 struct ifmcaddr6 *ifmca;
4449 struct ifacaddr6 *ifaca;
4450 int err = 1;
4451 int ip_idx = *p_ip_idx;
4452
4453 read_lock_bh(&idev->lock);
4454 switch (type) {
502a2ffd 4455 case UNICAST_ADDR: {
4456 struct inet6_ifaddr *ifa;
4457
234b27c3 4458 /* unicast address incl. temp addr */
502a2ffd 4459 list_for_each_entry(ifa, &idev->addr_list, if_list) {
4460 if (++ip_idx < s_ip_idx)
234b27c3
ED		 4461 continue;
4462 err = inet6_fill_ifaddr(skb, ifa,
15e47304 4463 NETLINK_CB(cb->skb).portid,
234b27c3
ED		 4464 cb->nlh->nlmsg_seq,
4465 RTM_NEWADDR,
4466 NLM_F_MULTI);
053c095a 4467 if (err < 0)
234b27c3 4468 break;
63998ac2 4469 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
234b27c3
ED		 4470 }
4471 break;
502a2ffd 4472 }
234b27c3
ED		 4473 case MULTICAST_ADDR:
4474 /* multicast address */
4475 for (ifmca = idev->mc_list; ifmca;
4476 ifmca = ifmca->next, ip_idx++) {
4477 if (ip_idx < s_ip_idx)
4478 continue;
4479 err = inet6_fill_ifmcaddr(skb, ifmca,
15e47304 4480 NETLINK_CB(cb->skb).portid,
234b27c3
ED		 4481 cb->nlh->nlmsg_seq,
4482 RTM_GETMULTICAST,
4483 NLM_F_MULTI);
053c095a 4484 if (err < 0)
234b27c3
ED		 4485 break;
4486 }
4487 break;
4488 case ANYCAST_ADDR:
4489 /* anycast address */
4490 for (ifaca = idev->ac_list; ifaca;
4491 ifaca = ifaca->aca_next, ip_idx++) {
4492 if (ip_idx < s_ip_idx)
4493 continue;
4494 err = inet6_fill_ifacaddr(skb, ifaca,
15e47304 4495 NETLINK_CB(cb->skb).portid,
234b27c3
ED		 4496 cb->nlh->nlmsg_seq,
4497 RTM_GETANYCAST,
4498 NLM_F_MULTI);
053c095a 4499 if (err < 0)
234b27c3
ED		 4500 break;
4501 }
4502 break;
4503 default:
4504 break;
4505 }
4506 read_unlock_bh(&idev->lock);
4507 *p_ip_idx = ip_idx;
4508 return err;
4509}
4510
1da177e4
LT		 4511static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
4512 enum addr_type_t type)
4513{
234b27c3
ED		 4514 struct net *net = sock_net(skb->sk);
4515 int h, s_h;
1da177e4
LT		 4516 int idx, ip_idx;
4517 int s_idx, s_ip_idx;
1da177e4 4518 struct net_device *dev;
234b27c3
ED		 4519 struct inet6_dev *idev;
4520 struct hlist_head *head;
1ab1457c 4521
234b27c3
ED		 4522 s_h = cb->args[0];
4523 s_idx = idx = cb->args[1];
4524 s_ip_idx = ip_idx = cb->args[2];
5d5619b4 4525
234b27c3 4526 rcu_read_lock();
63998ac2 4527 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ net->dev_base_seq;
234b27c3
ED		 4528 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4529 idx = 0;
4530 head = &net->dev_index_head[h];
b67bfe0d 4531 hlist_for_each_entry_rcu(dev, head, index_hlist) {
234b27c3
ED		 4532 if (idx < s_idx)
4533 goto cont;
4b97efdf 4534 if (h > s_h || idx > s_idx)
234b27c3
ED		 4535 s_ip_idx = 0;
4536 ip_idx = 0;
e21e8467
SH		 4537 idev = __in6_dev_get(dev);
4538 if (!idev)
234b27c3
ED		 4539 goto cont;
4540
4541 if (in6_dump_addrs(idev, skb, cb, type,
7b46a644 4542 s_ip_idx, &ip_idx) < 0)
234b27c3 4543 goto done;
7562f876 4544cont:
234b27c3
ED		 4545 idx++;
4546 }
1da177e4 4547 }
234b27c3
ED		 4548done:
4549 rcu_read_unlock();
4550 cb->args[0] = h;
4551 cb->args[1] = idx;
4552 cb->args[2] = ip_idx;
4553
1da177e4
LT		 4554 return skb->len;
4555}
4556
4557static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
4558{
4559 enum addr_type_t type = UNICAST_ADDR;
b854272b 4560
1da177e4
LT		 4561 return inet6_dump_addr(skb, cb, type);
4562}
4563
4564static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
4565{
4566 enum addr_type_t type = MULTICAST_ADDR;
b854272b 4567
1da177e4
LT		 4568 return inet6_dump_addr(skb, cb, type);
4569}
4570
4571
4572static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
4573{
4574 enum addr_type_t type = ANYCAST_ADDR;
b854272b 4575
1da177e4
LT		 4576 return inet6_dump_addr(skb, cb, type);
4577}
4578
661d2967 4579static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh)
6c223828 4580{
3b1e0a65 4581 struct net *net = sock_net(in_skb->sk);
1b29fc2c
TG		 4582 struct ifaddrmsg *ifm;
4583 struct nlattr *tb[IFA_MAX+1];
caeaba79 4584 struct in6_addr *addr = NULL, *peer;
6c223828
NT		 4585 struct net_device *dev = NULL;
4586 struct inet6_ifaddr *ifa;
4587 struct sk_buff *skb;
6c223828
NT		 4588 int err;
4589
1b29fc2c
TG		 4590 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
4591 if (err < 0)
4592 goto errout;
4593
caeaba79 4594 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer);
63159f29 4595 if (!addr) {
1b29fc2c
TG		 4596 err = -EINVAL;
4597 goto errout;
6c223828 4598 }
6c223828 4599
1b29fc2c 4600 ifm = nlmsg_data(nlh);
6c223828 4601 if (ifm->ifa_index)
6fda7350 4602 dev = __dev_get_by_index(net, ifm->ifa_index);
6c223828 4603
e21e8467
SH		 4604 ifa = ipv6_get_ifaddr(net, addr, dev, 1);
4605 if (!ifa) {
1b29fc2c
TG		 4606 err = -EADDRNOTAVAIL;
4607 goto errout;
4608 }
6c223828 4609
e21e8467
SH		 4610 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
4611 if (!skb) {
6c223828 4612 err = -ENOBUFS;
1b29fc2c 4613 goto errout_ifa;
6c223828
NT		 4614 }
4615
15e47304 4616 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).portid,
6c223828 4617 nlh->nlmsg_seq, RTM_NEWADDR, 0);
26932566
PM		 4618 if (err < 0) {
4619 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4620 WARN_ON(err == -EMSGSIZE);
4621 kfree_skb(skb);
4622 goto errout_ifa;
4623 }
15e47304 4624 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
1b29fc2c 4625errout_ifa:
6c223828 4626 in6_ifa_put(ifa);
1b29fc2c 4627errout:
6c223828 4628 return err;
6c223828
NT		 4629}
4630
1da177e4
LT		 4631static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
4632{
4633 struct sk_buff *skb;
c346dca1 4634 struct net *net = dev_net(ifa->idev->dev);
5d620266 4635 int err = -ENOBUFS;
1da177e4 4636
0ab6803b 4637 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
63159f29 4638 if (!skb)
5d620266
TG		 4639 goto errout;
4640
4641 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
26932566
PM		 4642 if (err < 0) {
4643 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4644 WARN_ON(err == -EMSGSIZE);
4645 kfree_skb(skb);
4646 goto errout;
4647 }
1ce85fe4
PNA		 4648 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
4649 return;
5d620266
TG		 4650errout:
4651 if (err < 0)
6fda7350 4652 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
1da177e4
LT		 4653}
4654
b6f99a21 4655static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
1da177e4
LT		 4656 __s32 *array, int bytes)
4657{
04561c1f
TG		 4658 BUG_ON(bytes < (DEVCONF_MAX * 4));
4659
1da177e4
LT		 4660 memset(array, 0, bytes);
4661 array[DEVCONF_FORWARDING] = cnf->forwarding;
4662 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
4663 array[DEVCONF_MTU6] = cnf->mtu6;
4664 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
4665 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
4666 array[DEVCONF_AUTOCONF] = cnf->autoconf;
4667 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
4668 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
93908d19
TG		 4669 array[DEVCONF_RTR_SOLICIT_INTERVAL] =
4670 jiffies_to_msecs(cnf->rtr_solicit_interval);
4671 array[DEVCONF_RTR_SOLICIT_DELAY] =
4672 jiffies_to_msecs(cnf->rtr_solicit_delay);
1da177e4 4673 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
fc4eba58
HFS		 4674 array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] =
4675 jiffies_to_msecs(cnf->mldv1_unsolicited_report_interval);
4676 array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] =
4677 jiffies_to_msecs(cnf->mldv2_unsolicited_report_interval);
1da177e4
LT		 4678 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
4679 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
4680 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
4681 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
4682 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
1da177e4 4683 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
65f5c7c1 4684 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
8013d1d7 4685 array[DEVCONF_ACCEPT_RA_MIN_HOP_LIMIT] = cnf->accept_ra_min_hop_limit;
c4fd30eb 4686 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
930d6ff2
YH		 4687#ifdef CONFIG_IPV6_ROUTER_PREF
4688 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
93908d19
TG		 4689 array[DEVCONF_RTR_PROBE_INTERVAL] =
4690 jiffies_to_msecs(cnf->rtr_probe_interval);
fa03ef38 4691#ifdef CONFIG_IPV6_ROUTE_INFO
09c884d4
YH		 4692 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
4693#endif
930d6ff2 4694#endif
fbea49e1 4695 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
0bcbc926 4696 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
95c385b4
NH		 4697#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4698 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
7fd2561e 4699 array[DEVCONF_USE_OPTIMISTIC] = cnf->use_optimistic;
95c385b4 4700#endif
7bc570c8
YH		 4701#ifdef CONFIG_IPV6_MROUTE
4702 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
4703#endif
778d80be 4704 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
1b34be74 4705 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
c3faca05 4706 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
5cb04436 4707 array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify;
b800c3b9 4708 array[DEVCONF_SUPPRESS_FRAG_NDISC] = cnf->suppress_frag_ndisc;
d9333196 4709 array[DEVCONF_ACCEPT_RA_FROM_LOCAL] = cnf->accept_ra_from_local;
c2943f14 4710 array[DEVCONF_ACCEPT_RA_MTU] = cnf->accept_ra_mtu;
35103d11 4711 array[DEVCONF_IGNORE_ROUTES_WITH_LINKDOWN] = cnf->ignore_routes_with_linkdown;
3d1bec99 4712 /* we omit DEVCONF_STABLE_SECRET for now */
3985e8a3 4713 array[DEVCONF_USE_OIF_ADDRS_ONLY] = cnf->use_oif_addrs_only;
abbc3043 4714 array[DEVCONF_DROP_UNICAST_IN_L2_MULTICAST] = cnf->drop_unicast_in_l2_multicast;
7a02bf89 4715 array[DEVCONF_DROP_UNSOLICITED_NA] = cnf->drop_unsolicited_na;
1da177e4
LT		 4716}
4717
b382b191
TG		 4718static inline size_t inet6_ifla6_size(void)
4719{
4720 return nla_total_size(4) /* IFLA_INET6_FLAGS */
4721 + nla_total_size(sizeof(struct ifla_cacheinfo))
4722 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
4723 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
f53adae4
DB		 4724 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
4725 + nla_total_size(sizeof(struct in6_addr)); /* IFLA_INET6_TOKEN */
b382b191
TG		 4726}
4727
339bf98f
TG		 4728static inline size_t inet6_if_nlmsg_size(void)
4729{
4730 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
4731 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
4732 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
4733 + nla_total_size(4) /* IFLA_MTU */
4734 + nla_total_size(4) /* IFLA_LINK */
0344338b 4735 + nla_total_size(1) /* IFLA_OPERSTATE */
b382b191 4736 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */
339bf98f 4737}
c5396a31 4738
be281e55 4739static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib,
7d720c3e 4740 int items, int bytes)
7f7d9a6b
HX		 4741{
4742 int i;
4743 int pad = bytes - sizeof(u64) * items;
4744 BUG_ON(pad < 0);
4745
4746 /* Use put_unaligned() because stats may not be aligned for u64. */
4747 put_unaligned(items, &stats[0]);
4748 for (i = 1; i < items; i++)
be281e55 4749 put_unaligned(atomic_long_read(&mib[i]), &stats[i]);
7f7d9a6b
HX		 4750
4751 memset(&stats[items], 0, pad);
4752}
4753
698365fa 4754static inline void __snmp6_fill_stats64(u64 *stats, void __percpu *mib,
a3a77372 4755 int bytes, size_t syncpoff)
4ce3c183 4756{
a3a77372
R		 4757 int i, c;
4758 u64 buff[IPSTATS_MIB_MAX];
4759 int pad = bytes - sizeof(u64) * IPSTATS_MIB_MAX;
4760
4ce3c183
ED		 4761 BUG_ON(pad < 0);
4762
a3a77372
R		 4763 memset(buff, 0, sizeof(buff));
4764 buff[0] = IPSTATS_MIB_MAX;
4ce3c183 4765
a3a77372
R		 4766 for_each_possible_cpu(c) {
4767 for (i = 1; i < IPSTATS_MIB_MAX; i++)
4768 buff[i] += snmp_get_cpu_field64(mib, c, i, syncpoff);
4769 }
4770
4771 memcpy(stats, buff, IPSTATS_MIB_MAX * sizeof(u64));
4772 memset(&stats[IPSTATS_MIB_MAX], 0, pad);
4ce3c183
ED		 4773}
4774
7f7d9a6b
HX		 4775static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
4776 int bytes)
4777{
e21e8467 4778 switch (attrtype) {
7f7d9a6b 4779 case IFLA_INET6_STATS:
a3a77372
R		 4780 __snmp6_fill_stats64(stats, idev->stats.ipv6, bytes,
4781 offsetof(struct ipstats_mib, syncp));
7f7d9a6b
HX		 4782 break;
4783 case IFLA_INET6_ICMP6STATS:
be281e55 4784 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, ICMP6_MIB_MAX, bytes);
7f7d9a6b
HX		 4785 break;
4786 }
4787}
4788
d5566fd7
SV		 4789static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev,
4790 u32 ext_filter_mask)
b382b191
TG		 4791{
4792 struct nlattr *nla;
4793 struct ifla_cacheinfo ci;
4794
c78679e8
DM		 4795 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags))
4796 goto nla_put_failure;
b382b191 4797 ci.max_reasm_len = IPV6_MAXPLEN;
24912420
DM		 4798 ci.tstamp = cstamp_delta(idev->tstamp);
4799 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time);
1f9248e5 4800 ci.retrans_time = jiffies_to_msecs(NEIGH_VAR(idev->nd_parms, RETRANS_TIME));
c78679e8
DM		 4801 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci))
4802 goto nla_put_failure;
b382b191 4803 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
63159f29 4804 if (!nla)
b382b191
TG		 4805 goto nla_put_failure;
4806 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
4807
4808 /* XXX - MC not implemented */
4809
d5566fd7
SV		 4810 if (ext_filter_mask & RTEXT_FILTER_SKIP_STATS)
4811 return 0;
4812
b382b191 4813 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
63159f29 4814 if (!nla)
b382b191
TG		 4815 goto nla_put_failure;
4816 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
4817
4818 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
63159f29 4819 if (!nla)
b382b191
TG		 4820 goto nla_put_failure;
4821 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
4822
f53adae4 4823 nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr));
63159f29 4824 if (!nla)
f53adae4 4825 goto nla_put_failure;
bc91b0f0
JP		 4826
4827 if (nla_put_u8(skb, IFLA_INET6_ADDR_GEN_MODE, idev->addr_gen_mode))
4828 goto nla_put_failure;
4829
f53adae4
DB		 4830 read_lock_bh(&idev->lock);
4831 memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla));
4832 read_unlock_bh(&idev->lock);
4833
b382b191
TG		 4834 return 0;
4835
4836nla_put_failure:
4837 return -EMSGSIZE;
4838}
4839
b1974ed0
AR		 4840static size_t inet6_get_link_af_size(const struct net_device *dev,
4841 u32 ext_filter_mask)
b382b191
TG		 4842{
4843 if (!__in6_dev_get(dev))
4844 return 0;
4845
4846 return inet6_ifla6_size();
4847}
4848
d5566fd7
SV		 4849static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev,
4850 u32 ext_filter_mask)
b382b191
TG		 4851{
4852 struct inet6_dev *idev = __in6_dev_get(dev);
4853
4854 if (!idev)
4855 return -ENODATA;
4856
d5566fd7 4857 if (inet6_fill_ifla6_attrs(skb, idev, ext_filter_mask) < 0)
b382b191
TG		 4858 return -EMSGSIZE;
4859
4860 return 0;
4861}
4862
f53adae4
DB		 4863static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token)
4864{
f53adae4
DB		 4865 struct inet6_ifaddr *ifp;
4866 struct net_device *dev = idev->dev;
fc403832 4867 bool update_rs = false;
dc848292 4868 struct in6_addr ll_addr;
f53adae4 4869
c15b1cca
HFS		 4870 ASSERT_RTNL();
4871
63159f29 4872 if (!token)
f53adae4
DB		 4873 return -EINVAL;
4874 if (ipv6_addr_any(token))
4875 return -EINVAL;
4876 if (dev->flags & (IFF_LOOPBACK | IFF_NOARP))
4877 return -EINVAL;
f53adae4
DB		 4878 if (!ipv6_accept_ra(idev))
4879 return -EINVAL;
4880 if (idev->cnf.rtr_solicits <= 0)
4881 return -EINVAL;
4882
4883 write_lock_bh(&idev->lock);
4884
4885 BUILD_BUG_ON(sizeof(token->s6_addr) != 16);
4886 memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8);
4887
4888 write_unlock_bh(&idev->lock);
4889
dc848292
HFS		 4890 if (!idev->dead && (idev->if_flags & IF_READY) &&
4891 !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE |
4892 IFA_F_OPTIMISTIC)) {
fc403832
DB		 4893
4894 /* If we're not ready, then normal ifup will take care
4895 * of this. Otherwise, we need to request our rs here.
4896 */
4897 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters);
4898 update_rs = true;
4899 }
f53adae4
DB		 4900
4901 write_lock_bh(&idev->lock);
fc403832 4902
77ecaace 4903 if (update_rs) {
fc403832 4904 idev->if_flags |= IF_RS_SENT;
77ecaace
HFS		 4905 idev->rs_probes = 1;
4906 addrconf_mod_rs_timer(idev, idev->cnf.rtr_solicit_interval);
4907 }
f53adae4
DB		 4908
4909 /* Well, that's kinda nasty ... */
4910 list_for_each_entry(ifp, &idev->addr_list, if_list) {
4911 spin_lock(&ifp->lock);
617fe29d 4912 if (ifp->tokenized) {
f53adae4
DB		 4913 ifp->valid_lft = 0;
4914 ifp->prefered_lft = 0;
4915 }
4916 spin_unlock(&ifp->lock);
4917 }
4918
4919 write_unlock_bh(&idev->lock);
b2ed64a9 4920 inet6_ifinfo_notify(RTM_NEWLINK, idev);
c15b1cca 4921 addrconf_verify_rtnl();
f53adae4
DB		 4922 return 0;
4923}
4924
11b1f828
DB		 4925static const struct nla_policy inet6_af_policy[IFLA_INET6_MAX + 1] = {
4926 [IFLA_INET6_ADDR_GEN_MODE] = { .type = NLA_U8 },
4927 [IFLA_INET6_TOKEN] = { .len = sizeof(struct in6_addr) },
4928};
4929
4930static int inet6_validate_link_af(const struct net_device *dev,
4931 const struct nlattr *nla)
4932{
4933 struct nlattr *tb[IFLA_INET6_MAX + 1];
4934
4935 if (dev && !__in6_dev_get(dev))
4936 return -EAFNOSUPPORT;
4937
4938 return nla_parse_nested(tb, IFLA_INET6_MAX, nla, inet6_af_policy);
4939}
4940
f53adae4
DB		 4941static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla)
4942{
4943 int err = -EINVAL;
4944 struct inet6_dev *idev = __in6_dev_get(dev);
4945 struct nlattr *tb[IFLA_INET6_MAX + 1];
4946
4947 if (!idev)
4948 return -EAFNOSUPPORT;
4949
4950 if (nla_parse_nested(tb, IFLA_INET6_MAX, nla, NULL) < 0)
4951 BUG();
4952
bc91b0f0 4953 if (tb[IFLA_INET6_TOKEN]) {
f53adae4 4954 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN]));
bc91b0f0
JP		 4955 if (err)
4956 return err;
4957 }
4958
4959 if (tb[IFLA_INET6_ADDR_GEN_MODE]) {
4960 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]);
4961
4962 if (mode != IN6_ADDR_GEN_MODE_EUI64 &&
622c81d5 4963 mode != IN6_ADDR_GEN_MODE_NONE &&
cc9da6cc
BM		 4964 mode != IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
4965 mode != IN6_ADDR_GEN_MODE_RANDOM)
622c81d5
HFS		 4966 return -EINVAL;
4967
4968 if (mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
4969 !idev->cnf.stable_secret.initialized &&
4970 !dev_net(dev)->ipv6.devconf_dflt->stable_secret.initialized)
bc91b0f0 4971 return -EINVAL;
622c81d5 4972
bc91b0f0
JP		 4973 idev->addr_gen_mode = mode;
4974 err = 0;
4975 }
f53adae4
DB		 4976
4977 return err;
4978}
4979
1ab1457c 4980static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
15e47304 4981 u32 portid, u32 seq, int event, unsigned int flags)
1da177e4 4982{
04561c1f 4983 struct net_device *dev = idev->dev;
04561c1f
TG		 4984 struct ifinfomsg *hdr;
4985 struct nlmsghdr *nlh;
4986 void *protoinfo;
04561c1f 4987
15e47304 4988 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags);
63159f29 4989 if (!nlh)
26932566 4990 return -EMSGSIZE;
04561c1f
TG		 4991
4992 hdr = nlmsg_data(nlh);
4993 hdr->ifi_family = AF_INET6;
4994 hdr->__ifi_pad = 0;
4995 hdr->ifi_type = dev->type;
4996 hdr->ifi_index = dev->ifindex;
4997 hdr->ifi_flags = dev_get_flags(dev);
4998 hdr->ifi_change = 0;
4999
c78679e8
DM		 5000 if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
5001 (dev->addr_len &&
5002 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
5003 nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
a54acb3a 5004 (dev->ifindex != dev_get_iflink(dev) &&
0344338b
AG		 5005 nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))) ||
5006 nla_put_u8(skb, IFLA_OPERSTATE,
5007 netif_running(dev) ? dev->operstate : IF_OPER_DOWN))
c78679e8 5008 goto nla_put_failure;
04561c1f 5009 protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
63159f29 5010 if (!protoinfo)
04561c1f 5011 goto nla_put_failure;
1da177e4 5012
d5566fd7 5013 if (inet6_fill_ifla6_attrs(skb, idev, 0) < 0)
bf99f1bd 5014 goto nla_put_failure;
1da177e4 5015
04561c1f 5016 nla_nest_end(skb, protoinfo);
053c095a
JB		 5017 nlmsg_end(skb, nlh);
5018 return 0;
1da177e4 5019
04561c1f 5020nla_put_failure:
26932566
PM		 5021 nlmsg_cancel(skb, nlh);
5022 return -EMSGSIZE;
1da177e4
LT		 5023}
5024
5025static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
5026{
3b1e0a65 5027 struct net *net = sock_net(skb->sk);
84d2697d 5028 int h, s_h;
434a8a58 5029 int idx = 0, s_idx;
1da177e4
LT		 5030 struct net_device *dev;
5031 struct inet6_dev *idev;
84d2697d 5032 struct hlist_head *head;
1da177e4 5033
84d2697d
ED		 5034 s_h = cb->args[0];
5035 s_idx = cb->args[1];
5036
5037 rcu_read_lock();
5038 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
5039 idx = 0;
5040 head = &net->dev_index_head[h];
b67bfe0d 5041 hlist_for_each_entry_rcu(dev, head, index_hlist) {
84d2697d
ED		 5042 if (idx < s_idx)
5043 goto cont;
5044 idev = __in6_dev_get(dev);
5045 if (!idev)
5046 goto cont;
5047 if (inet6_fill_ifinfo(skb, idev,
15e47304 5048 NETLINK_CB(cb->skb).portid,
84d2697d 5049 cb->nlh->nlmsg_seq,
053c095a 5050 RTM_NEWLINK, NLM_F_MULTI) < 0)
84d2697d 5051 goto out;
7562f876 5052cont:
84d2697d
ED		 5053 idx++;
5054 }
1da177e4 5055 }
84d2697d
ED		 5056out:
5057 rcu_read_unlock();
5058 cb->args[1] = idx;
5059 cb->args[0] = h;
1da177e4
LT		 5060
5061 return skb->len;
5062}
5063
5064void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
5065{
5066 struct sk_buff *skb;
c346dca1 5067 struct net *net = dev_net(idev->dev);
8d7a76c9 5068 int err = -ENOBUFS;
1ab1457c 5069
339bf98f 5070 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
63159f29 5071 if (!skb)
8d7a76c9
TG		 5072 goto errout;
5073
5074 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
26932566
PM		 5075 if (err < 0) {
5076 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
5077 WARN_ON(err == -EMSGSIZE);
5078 kfree_skb(skb);
5079 goto errout;
5080 }
5f75a104 5081 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC);
1ce85fe4 5082 return;
8d7a76c9
TG		 5083errout:
5084 if (err < 0)
5f75a104 5085 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err);
1da177e4
LT		 5086}
5087
339bf98f
TG		 5088static inline size_t inet6_prefix_nlmsg_size(void)
5089{
5090 return NLMSG_ALIGN(sizeof(struct prefixmsg))
5091 + nla_total_size(sizeof(struct in6_addr))
5092 + nla_total_size(sizeof(struct prefix_cacheinfo));
5093}
c5396a31 5094
1da177e4 5095static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
15e47304 5096 struct prefix_info *pinfo, u32 portid, u32 seq,
6051e2f4 5097 int event, unsigned int flags)
1da177e4 5098{
6051e2f4
TG		 5099 struct prefixmsg *pmsg;
5100 struct nlmsghdr *nlh;
1da177e4
LT		 5101 struct prefix_cacheinfo ci;
5102
15e47304 5103 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags);
63159f29 5104 if (!nlh)
26932566 5105 return -EMSGSIZE;
6051e2f4
TG		 5106
5107 pmsg = nlmsg_data(nlh);
1da177e4 5108 pmsg->prefix_family = AF_INET6;
8a47077a
PM		 5109 pmsg->prefix_pad1 = 0;
5110 pmsg->prefix_pad2 = 0;
1da177e4
LT		 5111 pmsg->prefix_ifindex = idev->dev->ifindex;
5112 pmsg->prefix_len = pinfo->prefix_len;
5113 pmsg->prefix_type = pinfo->type;
8a47077a 5114 pmsg->prefix_pad3 = 0;
1da177e4
LT		 5115 pmsg->prefix_flags = 0;
5116 if (pinfo->onlink)
5117 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
5118 if (pinfo->autoconf)
5119 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
5120
c78679e8
DM		 5121 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix))
5122 goto nla_put_failure;
1da177e4
LT		 5123 ci.preferred_time = ntohl(pinfo->prefered);
5124 ci.valid_time = ntohl(pinfo->valid);
c78679e8
DM		 5125 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci))
5126 goto nla_put_failure;
053c095a
JB		 5127 nlmsg_end(skb, nlh);
5128 return 0;
1da177e4 5129
6051e2f4 5130nla_put_failure:
26932566
PM		 5131 nlmsg_cancel(skb, nlh);
5132 return -EMSGSIZE;
1da177e4
LT		 5133}
5134
1ab1457c 5135static void inet6_prefix_notify(int event, struct inet6_dev *idev,
1da177e4
LT		 5136 struct prefix_info *pinfo)
5137{
5138 struct sk_buff *skb;
c346dca1 5139 struct net *net = dev_net(idev->dev);
8c384bfa 5140 int err = -ENOBUFS;
1da177e4 5141
339bf98f 5142 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
63159f29 5143 if (!skb)
8c384bfa
TG		 5144 goto errout;
5145
5146 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
26932566
PM		 5147 if (err < 0) {
5148 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
5149 WARN_ON(err == -EMSGSIZE);
5150 kfree_skb(skb);
5151 goto errout;
5152 }
1ce85fe4
PNA		 5153 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
5154 return;
8c384bfa
TG		 5155errout:
5156 if (err < 0)
6fda7350 5157 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
1da177e4
LT		 5158}
5159
1da177e4
LT		 5160static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
5161{
63998ac2
ND		 5162 struct net *net = dev_net(ifp->idev->dev);
5163
c15b1cca
HFS		 5164 if (event)
5165 ASSERT_RTNL();
5166
1da177e4
LT		 5167 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
5168
5169 switch (event) {
5170 case RTM_NEWADDR:
95c385b4
NH		 5171 /*
5172 * If the address was optimistic
5173 * we inserted the route at the start of
5174 * our DAD process, so we don't need
5175 * to do it again
5176 */
5177 if (!(ifp->rt->rt6i_node))
5178 ip6_ins_rt(ifp->rt);
1da177e4
LT		 5179 if (ifp->idev->cnf.forwarding)
5180 addrconf_join_anycast(ifp);
7996c799 5181 if (!ipv6_addr_any(&ifp->peer_addr))
caeaba79
ND		 5182 addrconf_prefix_route(&ifp->peer_addr, 128,
5183 ifp->idev->dev, 0, 0);
1da177e4
LT		 5184 break;
5185 case RTM_DELADDR:
5186 if (ifp->idev->cnf.forwarding)
5187 addrconf_leave_anycast(ifp);
5188 addrconf_leave_solict(ifp->idev, &ifp->addr);
7996c799 5189 if (!ipv6_addr_any(&ifp->peer_addr)) {
caeaba79 5190 struct rt6_info *rt;
caeaba79 5191
e7478dfc
ND		 5192 rt = addrconf_get_prefix_route(&ifp->peer_addr, 128,
5193 ifp->idev->dev, 0, 0);
8e3d5be7
MKL		 5194 if (rt)
5195 ip6_del_rt(rt);
caeaba79 5196 }
d8d1f30b 5197 dst_hold(&ifp->rt->dst);
93fa159a 5198
8e3d5be7 5199 ip6_del_rt(ifp->rt);
705f1c86
HFS		 5200
5201 rt_genid_bump_ipv6(net);
1da177e4
LT		 5202 break;
5203 }
63998ac2 5204 atomic_inc(&net->ipv6.dev_addr_genid);
1da177e4
LT		 5205}
5206
5207static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
5208{
8814c4b5 5209 rcu_read_lock_bh();
1da177e4
LT		 5210 if (likely(ifp->idev->dead == 0))
5211 __ipv6_ifa_notify(event, ifp);
8814c4b5 5212 rcu_read_unlock_bh();
1da177e4
LT		 5213}
5214
5215#ifdef CONFIG_SYSCTL
5216
5217static
fe2c6338 5218int addrconf_sysctl_forward(struct ctl_table *ctl, int write,
1da177e4
LT		 5219 void __user *buffer, size_t *lenp, loff_t *ppos)
5220{
5221 int *valp = ctl->data;
5222 int val = *valp;
88af182e 5223 loff_t pos = *ppos;
fe2c6338 5224 struct ctl_table lctl;
1da177e4
LT		 5225 int ret;
5226
013d97e9
FR		 5227 /*
5228 * ctl->data points to idev->cnf.forwarding, we should
5229 * not modify it until we get the rtnl lock.
5230 */
5231 lctl = *ctl;
5232 lctl.data = &val;
5233
5234 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
1da177e4 5235
c8fecf22 5236 if (write)
b325fddb 5237 ret = addrconf_fixup_forwarding(ctl, valp, val);
88af182e
EB		 5238 if (ret)
5239 *ppos = pos;
1ab1457c 5240 return ret;
1da177e4
LT		 5241}
5242
d6df198d
PS		 5243static
5244int addrconf_sysctl_hop_limit(struct ctl_table *ctl, int write,
5245 void __user *buffer, size_t *lenp, loff_t *ppos)
5246{
5247 struct ctl_table lctl;
5248 int min_hl = 1, max_hl = 255;
5249
5250 lctl = *ctl;
5251 lctl.extra1 = &min_hl;
5252 lctl.extra2 = &max_hl;
5253
5254 return proc_dointvec_minmax(&lctl, write, buffer, lenp, ppos);
5255}
5256
77751427
ML		 5257static
5258int addrconf_sysctl_mtu(struct ctl_table *ctl, int write,
5259 void __user *buffer, size_t *lenp, loff_t *ppos)
5260{
5261 struct inet6_dev *idev = ctl->extra1;
5262 int min_mtu = IPV6_MIN_MTU;
5263 struct ctl_table lctl;
5264
5265 lctl = *ctl;
5266 lctl.extra1 = &min_mtu;
5267 lctl.extra2 = idev ? &idev->dev->mtu : NULL;
5268
5269 return proc_dointvec_minmax(&lctl, write, buffer, lenp, ppos);
5270}
5271
56d417b1
BH		 5272static void dev_disable_change(struct inet6_dev *idev)
5273{
75538c2b
CW		 5274 struct netdev_notifier_info info;
5275
56d417b1
BH		 5276 if (!idev || !idev->dev)
5277 return;
5278
75538c2b 5279 netdev_notifier_info_init(&info, idev->dev);
56d417b1 5280 if (idev->cnf.disable_ipv6)
75538c2b 5281 addrconf_notify(NULL, NETDEV_DOWN, &info);
56d417b1 5282 else
75538c2b 5283 addrconf_notify(NULL, NETDEV_UP, &info);
56d417b1
BH		 5284}
5285
5286static void addrconf_disable_change(struct net *net, __s32 newf)
5287{
5288 struct net_device *dev;
5289 struct inet6_dev *idev;
5290
c6d14c84
ED		 5291 rcu_read_lock();
5292 for_each_netdev_rcu(net, dev) {
56d417b1
BH		 5293 idev = __in6_dev_get(dev);
5294 if (idev) {
5295 int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
5296 idev->cnf.disable_ipv6 = newf;
5297 if (changed)
5298 dev_disable_change(idev);
5299 }
56d417b1 5300 }
c6d14c84 5301 rcu_read_unlock();
56d417b1
BH		 5302}
5303
013d97e9 5304static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf)
56d417b1
BH		 5305{
5306 struct net *net;
013d97e9
FR		 5307 int old;
5308
5309 if (!rtnl_trylock())
5310 return restart_syscall();
56d417b1
BH		 5311
5312 net = (struct net *)table->extra2;
013d97e9
FR		 5313 old = *p;
5314 *p = newf;
56d417b1 5315
013d97e9
FR		 5316 if (p == &net->ipv6.devconf_dflt->disable_ipv6) {
5317 rtnl_unlock();
56d417b1 5318 return 0;
88af182e 5319 }
56d417b1
BH		 5320
5321 if (p == &net->ipv6.devconf_all->disable_ipv6) {
56d417b1
BH		 5322 net->ipv6.devconf_dflt->disable_ipv6 = newf;
5323 addrconf_disable_change(net, newf);
013d97e9 5324 } else if ((!newf) ^ (!old))
56d417b1
BH		 5325 dev_disable_change((struct inet6_dev *)table->extra1);
5326
5327 rtnl_unlock();
5328 return 0;
5329}
5330
5331static
fe2c6338 5332int addrconf_sysctl_disable(struct ctl_table *ctl, int write,
56d417b1
BH		 5333 void __user *buffer, size_t *lenp, loff_t *ppos)
5334{
5335 int *valp = ctl->data;
5336 int val = *valp;
88af182e 5337 loff_t pos = *ppos;
fe2c6338 5338 struct ctl_table lctl;
56d417b1
BH		 5339 int ret;
5340
013d97e9
FR		 5341 /*
5342 * ctl->data points to idev->cnf.disable_ipv6, we should
5343 * not modify it until we get the rtnl lock.
5344 */
5345 lctl = *ctl;
5346 lctl.data = &val;
5347
5348 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
56d417b1
BH		 5349
5350 if (write)
5351 ret = addrconf_disable_ipv6(ctl, valp, val);
88af182e
EB		 5352 if (ret)
5353 *ppos = pos;
56d417b1
BH		 5354 return ret;
5355}
5356
c92d5491 5357static
5358int addrconf_sysctl_proxy_ndp(struct ctl_table *ctl, int write,
5359 void __user *buffer, size_t *lenp, loff_t *ppos)
5360{
5361 int *valp = ctl->data;
5362 int ret;
5363 int old, new;
5364
5365 old = *valp;
5366 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
5367 new = *valp;
5368
5369 if (write && old != new) {
5370 struct net *net = ctl->extra2;
5371
5372 if (!rtnl_trylock())
5373 return restart_syscall();
5374
5375 if (valp == &net->ipv6.devconf_dflt->proxy_ndp)
5376 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
5377 NETCONFA_IFINDEX_DEFAULT,
5378 net->ipv6.devconf_dflt);
5379 else if (valp == &net->ipv6.devconf_all->proxy_ndp)
5380 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
5381 NETCONFA_IFINDEX_ALL,
5382 net->ipv6.devconf_all);
5383 else {
5384 struct inet6_dev *idev = ctl->extra1;
5385
5386 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
5387 idev->dev->ifindex,
5388 &idev->cnf);
5389 }
5390 rtnl_unlock();
5391 }
5392
5393 return ret;
5394}
5395
3d1bec99
HFS		 5396static int addrconf_sysctl_stable_secret(struct ctl_table *ctl, int write,
5397 void __user *buffer, size_t *lenp,
5398 loff_t *ppos)
5399{
5400 int err;
5401 struct in6_addr addr;
5402 char str[IPV6_MAX_STRLEN];
5403 struct ctl_table lctl = *ctl;
622c81d5 5404 struct net *net = ctl->extra2;
3d1bec99
HFS		 5405 struct ipv6_stable_secret *secret = ctl->data;
5406
622c81d5
HFS		 5407 if (&net->ipv6.devconf_all->stable_secret == ctl->data)
5408 return -EIO;
5409
3d1bec99
HFS		 5410 lctl.maxlen = IPV6_MAX_STRLEN;
5411 lctl.data = str;
5412
5413 if (!rtnl_trylock())
5414 return restart_syscall();
5415
5416 if (!write && !secret->initialized) {
5417 err = -EIO;
5418 goto out;
5419 }
5420
5449a5ca
WC		 5421 err = snprintf(str, sizeof(str), "%pI6", &secret->secret);
5422 if (err >= sizeof(str)) {
5423 err = -EIO;
5424 goto out;
3d1bec99
HFS		 5425 }
5426
5427 err = proc_dostring(&lctl, write, buffer, lenp, ppos);
5428 if (err || !write)
5429 goto out;
5430
5431 if (in6_pton(str, -1, addr.in6_u.u6_addr8, -1, NULL) != 1) {
5432 err = -EIO;
5433 goto out;
5434 }
5435
5436 secret->initialized = true;
5437 secret->secret = addr;
5438
622c81d5
HFS		 5439 if (&net->ipv6.devconf_dflt->stable_secret == ctl->data) {
5440 struct net_device *dev;
5441
5442 for_each_netdev(net, dev) {
5443 struct inet6_dev *idev = __in6_dev_get(dev);
5444
5445 if (idev) {
5446 idev->addr_gen_mode =
5447 IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
5448 }
5449 }
5450 } else {
5451 struct inet6_dev *idev = ctl->extra1;
5452
5453 idev->addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
5454 }
5455
3d1bec99
HFS		 5456out:
5457 rtnl_unlock();
5458
5459 return err;
5460}
c92d5491 5461
35103d11
AG		 5462static
5463int addrconf_sysctl_ignore_routes_with_linkdown(struct ctl_table *ctl,
5464 int write,
5465 void __user *buffer,
5466 size_t *lenp,
5467 loff_t *ppos)
5468{
5469 int *valp = ctl->data;
5470 int val = *valp;
5471 loff_t pos = *ppos;
5472 struct ctl_table lctl;
5473 int ret;
5474
5475 /* ctl->data points to idev->cnf.ignore_routes_when_linkdown
5476 * we should not modify it until we get the rtnl lock.
5477 */
5478 lctl = *ctl;
5479 lctl.data = &val;
5480
5481 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
5482
5483 if (write)
5484 ret = addrconf_fixup_linkdown(ctl, valp, val);
5485 if (ret)
5486 *ppos = pos;
5487 return ret;
5488}
5489
1da177e4
LT		 5490static struct addrconf_sysctl_table
5491{
5492 struct ctl_table_header *sysctl_header;
fe2c6338 5493 struct ctl_table addrconf_vars[DEVCONF_MAX+1];
ab32ea5d 5494} addrconf_sysctl __read_mostly = {
1da177e4
LT		 5495 .sysctl_header = NULL,
5496 .addrconf_vars = {
1ab1457c 5497 {
e21e8467
SH		 5498 .procname = "forwarding",
5499 .data = &ipv6_devconf.forwarding,
5500 .maxlen = sizeof(int),
5501 .mode = 0644,
5502 .proc_handler = addrconf_sysctl_forward,
1da177e4
LT		 5503 },
5504 {
e21e8467
SH		 5505 .procname = "hop_limit",
5506 .data = &ipv6_devconf.hop_limit,
5507 .maxlen = sizeof(int),
5508 .mode = 0644,
d6df198d 5509 .proc_handler = addrconf_sysctl_hop_limit,
1da177e4
LT		 5510 },
5511 {
e21e8467
SH		 5512 .procname = "mtu",
5513 .data = &ipv6_devconf.mtu6,
5514 .maxlen = sizeof(int),
5515 .mode = 0644,
77751427 5516 .proc_handler = addrconf_sysctl_mtu,
1da177e4
LT		 5517 },
5518 {
e21e8467
SH		 5519 .procname = "accept_ra",
5520 .data = &ipv6_devconf.accept_ra,
5521 .maxlen = sizeof(int),
5522 .mode = 0644,
5523 .proc_handler = proc_dointvec,
1da177e4
LT		 5524 },
5525 {
e21e8467
SH		 5526 .procname = "accept_redirects",
5527 .data = &ipv6_devconf.accept_redirects,
5528 .maxlen = sizeof(int),
5529 .mode = 0644,
5530 .proc_handler = proc_dointvec,
1da177e4
LT		 5531 },
5532 {
e21e8467
SH		 5533 .procname = "autoconf",
5534 .data = &ipv6_devconf.autoconf,
5535 .maxlen = sizeof(int),
5536 .mode = 0644,
5537 .proc_handler = proc_dointvec,
1da177e4
LT		 5538 },
5539 {
e21e8467
SH		 5540 .procname = "dad_transmits",
5541 .data = &ipv6_devconf.dad_transmits,
5542 .maxlen = sizeof(int),
5543 .mode = 0644,
5544 .proc_handler = proc_dointvec,
1da177e4
LT		 5545 },
5546 {
e21e8467
SH		 5547 .procname = "router_solicitations",
5548 .data = &ipv6_devconf.rtr_solicits,
5549 .maxlen = sizeof(int),
5550 .mode = 0644,
5551 .proc_handler = proc_dointvec,
1da177e4
LT		 5552 },
5553 {
e21e8467
SH		 5554 .procname = "router_solicitation_interval",
5555 .data = &ipv6_devconf.rtr_solicit_interval,
5556 .maxlen = sizeof(int),
5557 .mode = 0644,
5558 .proc_handler = proc_dointvec_jiffies,
1da177e4
LT		 5559 },
5560 {
e21e8467
SH		 5561 .procname = "router_solicitation_delay",
5562 .data = &ipv6_devconf.rtr_solicit_delay,
5563 .maxlen = sizeof(int),
5564 .mode = 0644,
5565 .proc_handler = proc_dointvec_jiffies,
1da177e4
LT		 5566 },
5567 {
e21e8467
SH		 5568 .procname = "force_mld_version",
5569 .data = &ipv6_devconf.force_mld_version,
5570 .maxlen = sizeof(int),
5571 .mode = 0644,
5572 .proc_handler = proc_dointvec,
1da177e4 5573 },
fc4eba58
HFS		 5574 {
5575 .procname = "mldv1_unsolicited_report_interval",
5576 .data =
5577 &ipv6_devconf.mldv1_unsolicited_report_interval,
5578 .maxlen = sizeof(int),
5579 .mode = 0644,
5580 .proc_handler = proc_dointvec_ms_jiffies,
5581 },
5582 {
5583 .procname = "mldv2_unsolicited_report_interval",
5584 .data =
5585 &ipv6_devconf.mldv2_unsolicited_report_interval,
5586 .maxlen = sizeof(int),
5587 .mode = 0644,
5588 .proc_handler = proc_dointvec_ms_jiffies,
5589 },
1da177e4 5590 {
e21e8467
SH		 5591 .procname = "use_tempaddr",
5592 .data = &ipv6_devconf.use_tempaddr,
5593 .maxlen = sizeof(int),
5594 .mode = 0644,
5595 .proc_handler = proc_dointvec,
1da177e4
LT		 5596 },
5597 {
e21e8467
SH		 5598 .procname = "temp_valid_lft",
5599 .data = &ipv6_devconf.temp_valid_lft,
5600 .maxlen = sizeof(int),
5601 .mode = 0644,
5602 .proc_handler = proc_dointvec,
1da177e4
LT		 5603 },
5604 {
e21e8467
SH		 5605 .procname = "temp_prefered_lft",
5606 .data = &ipv6_devconf.temp_prefered_lft,
5607 .maxlen = sizeof(int),
5608 .mode = 0644,
5609 .proc_handler = proc_dointvec,
1da177e4
LT		 5610 },
5611 {
e21e8467
SH		 5612 .procname = "regen_max_retry",
5613 .data = &ipv6_devconf.regen_max_retry,
5614 .maxlen = sizeof(int),
5615 .mode = 0644,
5616 .proc_handler = proc_dointvec,
1da177e4
LT		 5617 },
5618 {
e21e8467
SH		 5619 .procname = "max_desync_factor",
5620 .data = &ipv6_devconf.max_desync_factor,
5621 .maxlen = sizeof(int),
5622 .mode = 0644,
5623 .proc_handler = proc_dointvec,
1da177e4 5624 },
1da177e4 5625 {
e21e8467
SH		 5626 .procname = "max_addresses",
5627 .data = &ipv6_devconf.max_addresses,
5628 .maxlen = sizeof(int),
5629 .mode = 0644,
5630 .proc_handler = proc_dointvec,
1da177e4 5631 },
65f5c7c1 5632 {
e21e8467
SH		 5633 .procname = "accept_ra_defrtr",
5634 .data = &ipv6_devconf.accept_ra_defrtr,
5635 .maxlen = sizeof(int),
5636 .mode = 0644,
5637 .proc_handler = proc_dointvec,
65f5c7c1 5638 },
8013d1d7
HL		 5639 {
5640 .procname = "accept_ra_min_hop_limit",
5641 .data = &ipv6_devconf.accept_ra_min_hop_limit,
5642 .maxlen = sizeof(int),
5643 .mode = 0644,
5644 .proc_handler = proc_dointvec,
5645 },
c4fd30eb 5646 {
e21e8467
SH		 5647 .procname = "accept_ra_pinfo",
5648 .data = &ipv6_devconf.accept_ra_pinfo,
5649 .maxlen = sizeof(int),
5650 .mode = 0644,
5651 .proc_handler = proc_dointvec,
c4fd30eb 5652 },
930d6ff2
YH		 5653#ifdef CONFIG_IPV6_ROUTER_PREF
5654 {
e21e8467
SH		 5655 .procname = "accept_ra_rtr_pref",
5656 .data = &ipv6_devconf.accept_ra_rtr_pref,
5657 .maxlen = sizeof(int),
5658 .mode = 0644,
5659 .proc_handler = proc_dointvec,
930d6ff2 5660 },
52e16356 5661 {
e21e8467
SH		 5662 .procname = "router_probe_interval",
5663 .data = &ipv6_devconf.rtr_probe_interval,
5664 .maxlen = sizeof(int),
5665 .mode = 0644,
5666 .proc_handler = proc_dointvec_jiffies,
52e16356 5667 },
fa03ef38 5668#ifdef CONFIG_IPV6_ROUTE_INFO
09c884d4 5669 {
e21e8467
SH		 5670 .procname = "accept_ra_rt_info_max_plen",
5671 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
5672 .maxlen = sizeof(int),
5673 .mode = 0644,
5674 .proc_handler = proc_dointvec,
09c884d4
YH		 5675 },
5676#endif
930d6ff2 5677#endif
fbea49e1 5678 {
e21e8467
SH		 5679 .procname = "proxy_ndp",
5680 .data = &ipv6_devconf.proxy_ndp,
5681 .maxlen = sizeof(int),
5682 .mode = 0644,
c92d5491 5683 .proc_handler = addrconf_sysctl_proxy_ndp,
fbea49e1 5684 },
0bcbc926 5685 {
e21e8467
SH		 5686 .procname = "accept_source_route",
5687 .data = &ipv6_devconf.accept_source_route,
5688 .maxlen = sizeof(int),
5689 .mode = 0644,
5690 .proc_handler = proc_dointvec,
0bcbc926 5691 },
95c385b4
NH		 5692#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
5693 {
e21e8467
SH		 5694 .procname = "optimistic_dad",
5695 .data = &ipv6_devconf.optimistic_dad,
5696 .maxlen = sizeof(int),
5697 .mode = 0644,
5698 .proc_handler = proc_dointvec,
95c385b4
NH		 5699
5700 },
7fd2561e
EK		 5701 {
5702 .procname = "use_optimistic",
5703 .data = &ipv6_devconf.use_optimistic,
5704 .maxlen = sizeof(int),
5705 .mode = 0644,
5706 .proc_handler = proc_dointvec,
5707
5708 },
7bc570c8
YH		 5709#endif
5710#ifdef CONFIG_IPV6_MROUTE
5711 {
e21e8467
SH		 5712 .procname = "mc_forwarding",
5713 .data = &ipv6_devconf.mc_forwarding,
5714 .maxlen = sizeof(int),
5715 .mode = 0444,
5716 .proc_handler = proc_dointvec,
7bc570c8 5717 },
95c385b4 5718#endif
778d80be 5719 {
e21e8467
SH		 5720 .procname = "disable_ipv6",
5721 .data = &ipv6_devconf.disable_ipv6,
5722 .maxlen = sizeof(int),
5723 .mode = 0644,
5724 .proc_handler = addrconf_sysctl_disable,
778d80be 5725 },
1b34be74 5726 {
e21e8467
SH		 5727 .procname = "accept_dad",
5728 .data = &ipv6_devconf.accept_dad,
5729 .maxlen = sizeof(int),
5730 .mode = 0644,
5731 .proc_handler = proc_dointvec,
1b34be74 5732 },
f7734fdf 5733 {
f7734fdf
OP		 5734 .procname = "force_tllao",
5735 .data = &ipv6_devconf.force_tllao,
5736 .maxlen = sizeof(int),
5737 .mode = 0644,
5738 .proc_handler = proc_dointvec
5739 },
5cb04436
HFS		 5740 {
5741 .procname = "ndisc_notify",
5742 .data = &ipv6_devconf.ndisc_notify,
5743 .maxlen = sizeof(int),
5744 .mode = 0644,
5745 .proc_handler = proc_dointvec
5746 },
b800c3b9
HFS		 5747 {
5748 .procname = "suppress_frag_ndisc",
5749 .data = &ipv6_devconf.suppress_frag_ndisc,
5750 .maxlen = sizeof(int),
5751 .mode = 0644,
5752 .proc_handler = proc_dointvec
5753 },
d9333196
BG		 5754 {
5755 .procname = "accept_ra_from_local",
5756 .data = &ipv6_devconf.accept_ra_from_local,
5757 .maxlen = sizeof(int),
5758 .mode = 0644,
5759 .proc_handler = proc_dointvec,
5760 },
c2943f14
HH		 5761 {
5762 .procname = "accept_ra_mtu",
5763 .data = &ipv6_devconf.accept_ra_mtu,
5764 .maxlen = sizeof(int),
5765 .mode = 0644,
5766 .proc_handler = proc_dointvec,
5767 },
3d1bec99
HFS		 5768 {
5769 .procname = "stable_secret",
5770 .data = &ipv6_devconf.stable_secret,
5771 .maxlen = IPV6_MAX_STRLEN,
5772 .mode = 0600,
5773 .proc_handler = addrconf_sysctl_stable_secret,
5774 },
3985e8a3
EK		 5775 {
5776 .procname = "use_oif_addrs_only",
5777 .data = &ipv6_devconf.use_oif_addrs_only,
5778 .maxlen = sizeof(int),
5779 .mode = 0644,
5780 .proc_handler = proc_dointvec,
35103d11
AG		 5781 },
5782 {
5783 .procname = "ignore_routes_with_linkdown",
5784 .data = &ipv6_devconf.ignore_routes_with_linkdown,
5785 .maxlen = sizeof(int),
5786 .mode = 0644,
5787 .proc_handler = addrconf_sysctl_ignore_routes_with_linkdown,
3985e8a3 5788 },
abbc3043
JB		 5789 {
5790 .procname = "drop_unicast_in_l2_multicast",
5791 .data = &ipv6_devconf.drop_unicast_in_l2_multicast,
5792 .maxlen = sizeof(int),
5793 .mode = 0644,
5794 .proc_handler = proc_dointvec,
5795 },
7a02bf89
JB		 5796 {
5797 .procname = "drop_unsolicited_na",
5798 .data = &ipv6_devconf.drop_unsolicited_na,
5799 .maxlen = sizeof(int),
5800 .mode = 0644,
5801 .proc_handler = proc_dointvec,
5802 },
1da177e4 5803 {
f8572d8f 5804 /* sentinel */
1da177e4
LT		 5805 }
5806 },
1da177e4
LT		 5807};
5808
bff16c2f 5809static int __addrconf_sysctl_register(struct net *net, char *dev_name,
f8572d8f 5810 struct inet6_dev *idev, struct ipv6_devconf *p)
1da177e4
LT		 5811{
5812 int i;
1da177e4 5813 struct addrconf_sysctl_table *t;
6105e293 5814 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ];
1dab6222 5815
af879cc7 5816 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
63159f29 5817 if (!t)
f68635e6
PE		 5818 goto out;
5819
bcdd553f 5820 for (i = 0; t->addrconf_vars[i].data; i++) {
e21e8467 5821 t->addrconf_vars[i].data += (char *)p - (char *)&ipv6_devconf;
1da177e4 5822 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
bff16c2f 5823 t->addrconf_vars[i].extra2 = net;
1da177e4 5824 }
1da177e4 5825
6105e293 5826 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name);
1da177e4 5827
6105e293 5828 t->sysctl_header = register_net_sysctl(net, path, t->addrconf_vars);
63159f29 5829 if (!t->sysctl_header)
6105e293 5830 goto free;
f68635e6
PE		 5831
5832 p->sysctl = t;
95897312 5833 return 0;
1da177e4 5834
f68635e6 5835free:
1da177e4 5836 kfree(t);
f68635e6 5837out:
95897312 5838 return -ENOBUFS;
1da177e4
LT		 5839}
5840
408c4768
PE		 5841static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
5842{
5843 struct addrconf_sysctl_table *t;
5844
63159f29 5845 if (!p->sysctl)
408c4768
PE		 5846 return;
5847
5848 t = p->sysctl;
5849 p->sysctl = NULL;
ff538818 5850 unregister_net_sysctl_table(t->sysctl_header);
408c4768
PE		 5851 kfree(t);
5852}
5853
a317a2f1 5854static int addrconf_sysctl_register(struct inet6_dev *idev)
f52295a9 5855{
a317a2f1
WC		 5856 int err;
5857
5858 if (!sysctl_dev_name_is_allowed(idev->dev->name))
5859 return -EINVAL;
5860
5861 err = neigh_sysctl_register(idev->dev, idev->nd_parms,
5862 &ndisc_ifinfo_sysctl_change);
5863 if (err)
5864 return err;
5865 err = __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
5866 idev, &idev->cnf);
5867 if (err)
5868 neigh_sysctl_unregister(idev->nd_parms);
5869
5870 return err;
f52295a9
PE		 5871}
5872
408c4768 5873static void addrconf_sysctl_unregister(struct inet6_dev *idev)
1da177e4 5874{
408c4768
PE		 5875 __addrconf_sysctl_unregister(&idev->cnf);
5876 neigh_sysctl_unregister(idev->nd_parms);
1da177e4
LT		 5877}
5878
5879
5880#endif
5881
2c8c1e72 5882static int __net_init addrconf_init_net(struct net *net)
e0da5a48 5883{
a79ca223 5884 int err = -ENOMEM;
e0da5a48
PE		 5885 struct ipv6_devconf *all, *dflt;
5886
a79ca223 5887 all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL);
63159f29 5888 if (!all)
a79ca223 5889 goto err_alloc_all;
e0da5a48 5890
a79ca223 5891 dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
63159f29 5892 if (!dflt)
a79ca223 5893 goto err_alloc_dflt;
e0da5a48 5894
a79ca223
HZ		 5895 /* these will be inherited by all namespaces */
5896 dflt->autoconf = ipv6_defaults.autoconf;
5897 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
e0da5a48 5898
3d1bec99
HFS		 5899 dflt->stable_secret.initialized = false;
5900 all->stable_secret.initialized = false;
5901
e0da5a48
PE		 5902 net->ipv6.devconf_all = all;
5903 net->ipv6.devconf_dflt = dflt;
5904
5905#ifdef CONFIG_SYSCTL
f8572d8f 5906 err = __addrconf_sysctl_register(net, "all", NULL, all);
e0da5a48
PE		 5907 if (err < 0)
5908 goto err_reg_all;
5909
f8572d8f 5910 err = __addrconf_sysctl_register(net, "default", NULL, dflt);
e0da5a48
PE		 5911 if (err < 0)
5912 goto err_reg_dflt;
5913#endif
5914 return 0;
5915
5916#ifdef CONFIG_SYSCTL
5917err_reg_dflt:
5918 __addrconf_sysctl_unregister(all);
5919err_reg_all:
5920 kfree(dflt);
5921#endif
5922err_alloc_dflt:
5923 kfree(all);
5924err_alloc_all:
5925 return err;
5926}
5927
2c8c1e72 5928static void __net_exit addrconf_exit_net(struct net *net)
e0da5a48
PE		 5929{
5930#ifdef CONFIG_SYSCTL
5931 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
5932 __addrconf_sysctl_unregister(net->ipv6.devconf_all);
5933#endif
73cf0e92 5934 kfree(net->ipv6.devconf_dflt);
5935 kfree(net->ipv6.devconf_all);
e0da5a48
PE		 5936}
5937
5938static struct pernet_operations addrconf_ops = {
5939 .init = addrconf_init_net,
5940 .exit = addrconf_exit_net,
5941};
5942
207895fd 5943static struct rtnl_af_ops inet6_ops __read_mostly = {
b382b191
TG		 5944 .family = AF_INET6,
5945 .fill_link_af = inet6_fill_link_af,
5946 .get_link_af_size = inet6_get_link_af_size,
11b1f828 5947 .validate_link_af = inet6_validate_link_af,
f53adae4 5948 .set_link_af = inet6_set_link_af,
b382b191
TG		 5949};
5950
1da177e4
LT		 5951/*
5952 * Init / cleanup code
5953 */
5954
5955int __init addrconf_init(void)
5956{
a317a2f1 5957 struct inet6_dev *idev;
c2e21293 5958 int i, err;
2a8cc6c8 5959
e21e8467
SH		 5960 err = ipv6_addr_label_init();
5961 if (err < 0) {
f3213831
JP		 5962 pr_crit("%s: cannot initialize default policy table: %d\n",
5963 __func__, err);
2cc6d2bf 5964 goto out;
2a8cc6c8 5965 }
1da177e4 5966
2cc6d2bf
NH		 5967 err = register_pernet_subsys(&addrconf_ops);
5968 if (err < 0)
5969 goto out_addrlabel;
e0da5a48 5970
c15b1cca
HFS		 5971 addrconf_wq = create_workqueue("ipv6_addrconf");
5972 if (!addrconf_wq) {
5973 err = -ENOMEM;
5974 goto out_nowq;
5975 }
5976
1da177e4
LT		 5977 /* The addrconf netdev notifier requires that loopback_dev
5978 * has it's ipv6 private information allocated and setup
5979 * before it can bring up and give link-local addresses
5980 * to other devices which are up.
5981 *
5982 * Unfortunately, loopback_dev is not necessarily the first
5983 * entry in the global dev_base list of net devices. In fact,
5984 * it is likely to be the very last entry on that list.
5985 * So this causes the notifier registry below to try and
5986 * give link-local addresses to all devices besides loopback_dev
5987 * first, then loopback_dev, which cases all the non-loopback_dev
5988 * devices to fail to get a link-local address.
5989 *
5990 * So, as a temporary fix, allocate the ipv6 structure for
5991 * loopback_dev first by hand.
5992 * Longer term, all of the dependencies ipv6 has upon the loopback
5993 * device and it being up should be removed.
5994 */
5995 rtnl_lock();
a317a2f1 5996 idev = ipv6_add_dev(init_net.loopback_dev);
1da177e4 5997 rtnl_unlock();
a317a2f1
WC		 5998 if (IS_ERR(idev)) {
5999 err = PTR_ERR(idev);
e0da5a48 6000 goto errlo;
a317a2f1 6001 }
1da177e4 6002
c2e21293 6003 for (i = 0; i < IN6_ADDR_HSIZE; i++)
6004 INIT_HLIST_HEAD(&inet6_addr_lst[i]);
6005
1da177e4
LT		 6006 register_netdevice_notifier(&ipv6_dev_notf);
6007
c15b1cca 6008 addrconf_verify();
c127ea2c 6009
3678a9d8 6010 rtnl_af_register(&inet6_ops);
b382b191 6011
c7ac8679
GR		 6012 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo,
6013 NULL);
c127ea2c
TG		 6014 if (err < 0)
6015 goto errout;
6016
6017 /* Only the first call to __rtnl_register can fail */
c7ac8679
GR		 6018 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL, NULL);
6019 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL, NULL);
6020 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr,
6021 inet6_dump_ifaddr, NULL);
6022 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL,
6023 inet6_dump_ifmcaddr, NULL);
6024 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL,
6025 inet6_dump_ifacaddr, NULL);
76f8f6cb 6026 __rtnl_register(PF_INET6, RTM_GETNETCONF, inet6_netconf_get_devconf,
7a674200 6027 inet6_netconf_dump_devconf, NULL);
c127ea2c 6028
2a8cc6c8
YH		 6029 ipv6_addr_label_rtnl_register();
6030
1da177e4 6031 return 0;
c127ea2c 6032errout:
b382b191 6033 rtnl_af_unregister(&inet6_ops);
c127ea2c 6034 unregister_netdevice_notifier(&ipv6_dev_notf);
e0da5a48 6035errlo:
c15b1cca
HFS		 6036 destroy_workqueue(addrconf_wq);
6037out_nowq:
e0da5a48 6038 unregister_pernet_subsys(&addrconf_ops);
2cc6d2bf
NH		 6039out_addrlabel:
6040 ipv6_addr_label_cleanup();
6041out:
c127ea2c 6042 return err;
1da177e4
LT		 6043}
6044
09f7709f 6045void addrconf_cleanup(void)
1da177e4 6046{
176c39af 6047 struct net_device *dev;
1da177e4
LT		 6048 int i;
6049
6050 unregister_netdevice_notifier(&ipv6_dev_notf);
e0da5a48 6051 unregister_pernet_subsys(&addrconf_ops);
2cc6d2bf 6052 ipv6_addr_label_cleanup();
1da177e4
LT		 6053
6054 rtnl_lock();
6055
b382b191
TG		 6056 __rtnl_af_unregister(&inet6_ops);
6057
176c39af
DL		 6058 /* clean dev list */
6059 for_each_netdev(&init_net, dev) {
6060 if (__in6_dev_get(dev) == NULL)
6061 continue;
6062 addrconf_ifdown(dev, 1);
6063 }
6064 addrconf_ifdown(init_net.loopback_dev, 2);
6065
1da177e4
LT		 6066 /*
6067 * Check hash table.
6068 */
5c578aed 6069 spin_lock_bh(&addrconf_hash_lock);
c2e21293 6070 for (i = 0; i < IN6_ADDR_HSIZE; i++)
6071 WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
5c578aed 6072 spin_unlock_bh(&addrconf_hash_lock);
c15b1cca 6073 cancel_delayed_work(&addr_chk_work);
1da177e4 6074 rtnl_unlock();
c15b1cca
HFS		 6075
6076 destroy_workqueue(addrconf_wq);
1da177e4 6077}
Linux kernel - Deliverables
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