]> git.proxmox.com Git - mirror_ubuntu-jammy-kernel.git/blame - net/ipv6/addrconf.c
projects / mirror_ubuntu-jammy-kernel.git / blame
? search:
summary | shortlog | log | commit | commitdiff | tree
blob | blame (incremental) | history | HEAD
net: Optimize snmp stat aggregation by walking all the percpu data at once
[mirror_ubuntu-jammy-kernel.git] / net / ipv6 / addrconf.c
CommitLineData
1da177e4
LT		 1/*
2 * IPv6 Address [auto]configuration
3 * Linux INET6 implementation
4 *
5 * Authors:
1ab1457c 6 * Pedro Roque <roque@di.fc.ul.pt>
1da177e4
LT		 7 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
8 *
1da177e4
LT		 9 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License
11 * as published by the Free Software Foundation; either version
12 * 2 of the License, or (at your option) any later version.
13 */
14
15/*
16 * Changes:
17 *
18 * Janos Farkas : delete timer on ifdown
19 * <chexum@bankinf.banki.hu>
20 * Andi Kleen : kill double kfree on module
21 * unload.
22 * Maciej W. Rozycki : FDDI support
23 * sekiya@USAGI : Don't send too many RS
24 * packets.
25 * yoshfuji@USAGI : Fixed interval between DAD
26 * packets.
27 * YOSHIFUJI Hideaki @USAGI : improved accuracy of
28 * address validation timer.
29 * YOSHIFUJI Hideaki @USAGI : Privacy Extensions (RFC3041)
30 * support.
31 * Yuji SEKIYA @USAGI : Don't assign a same IPv6
32 * address on a same interface.
33 * YOSHIFUJI Hideaki @USAGI : ARCnet support
34 * YOSHIFUJI Hideaki @USAGI : convert /proc/net/if_inet6 to
35 * seq_file.
b1cacb68
YH		 36 * YOSHIFUJI Hideaki @USAGI : improved source address
37 * selection; consider scope,
38 * status etc.
1da177e4
LT		 39 */
40
f3213831
JP		 41#define pr_fmt(fmt) "IPv6: " fmt
42
1da177e4
LT		 43#include <linux/errno.h>
44#include <linux/types.h>
a0bffffc 45#include <linux/kernel.h>
1da177e4
LT		 46#include <linux/socket.h>
47#include <linux/sockios.h>
1da177e4 48#include <linux/net.h>
3d1bec99 49#include <linux/inet.h>
1da177e4
LT		 50#include <linux/in6.h>
51#include <linux/netdevice.h>
1823730f 52#include <linux/if_addr.h>
1da177e4
LT		 53#include <linux/if_arp.h>
54#include <linux/if_arcnet.h>
55#include <linux/if_infiniband.h>
56#include <linux/route.h>
57#include <linux/inetdevice.h>
58#include <linux/init.h>
5a0e3ad6 59#include <linux/slab.h>
1da177e4
LT		 60#ifdef CONFIG_SYSCTL
61#include <linux/sysctl.h>
62#endif
4fc268d2 63#include <linux/capability.h>
1da177e4
LT		 64#include <linux/delay.h>
65#include <linux/notifier.h>
543537bd 66#include <linux/string.h>
ddbe5032 67#include <linux/hash.h>
1da177e4 68
457c4cbc 69#include <net/net_namespace.h>
1da177e4
LT		 70#include <net/sock.h>
71#include <net/snmp.h>
72
06a4c1c5 73#include <net/af_ieee802154.h>
cb6bf355 74#include <net/firewire.h>
1da177e4
LT		 75#include <net/ipv6.h>
76#include <net/protocol.h>
77#include <net/ndisc.h>
78#include <net/ip6_route.h>
79#include <net/addrconf.h>
80#include <net/tcp.h>
81#include <net/ip.h>
5d620266 82#include <net/netlink.h>
f24e3d65 83#include <net/pkt_sched.h>
1da177e4
LT		 84#include <linux/if_tunnel.h>
85#include <linux/rtnetlink.h>
f3a1bfb1 86#include <linux/netconf.h>
1da177e4 87#include <linux/random.h>
e21e8467 88#include <linux/uaccess.h>
7f7d9a6b 89#include <asm/unaligned.h>
1da177e4
LT		 90
91#include <linux/proc_fs.h>
92#include <linux/seq_file.h>
bc3b2d7f 93#include <linux/export.h>
1da177e4
LT		 94
95/* Set to 3 to get tracing... */
96#define ACONF_DEBUG 2
97
98#if ACONF_DEBUG >= 3
ba3542e1 99#define ADBG(fmt, ...) printk(fmt, ##__VA_ARGS__)
1da177e4 100#else
ba3542e1 101#define ADBG(fmt, ...) do { if (0) printk(fmt, ##__VA_ARGS__); } while (0)
1da177e4
LT		 102#endif
103
104#define INFINITY_LIFE_TIME 0xFFFFFFFF
18a31e1e 105
3d1bec99
HFS		 106#define IPV6_MAX_STRLEN \
107 sizeof("ffff:ffff:ffff:ffff:ffff:ffff:255.255.255.255")
108
18a31e1e
TG		 109static inline u32 cstamp_delta(unsigned long cstamp)
110{
111 return (cstamp - INITIAL_JIFFIES) * 100UL / HZ;
112}
1da177e4
LT		 113
114#ifdef CONFIG_SYSCTL
a317a2f1 115static int addrconf_sysctl_register(struct inet6_dev *idev);
408c4768
PE		 116static void addrconf_sysctl_unregister(struct inet6_dev *idev);
117#else
a317a2f1 118static inline int addrconf_sysctl_register(struct inet6_dev *idev)
408c4768 119{
a317a2f1 120 return 0;
408c4768
PE		 121}
122
123static inline void addrconf_sysctl_unregister(struct inet6_dev *idev)
124{
125}
1da177e4
LT		 126#endif
127
eb7e0575
SD		 128static void __ipv6_regen_rndid(struct inet6_dev *idev);
129static void __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
1da177e4 130static void ipv6_regen_rndid(unsigned long data);
1da177e4 131
1b34be74 132static int ipv6_generate_eui64(u8 *eui, struct net_device *dev);
1da177e4 133static int ipv6_count_addresses(struct inet6_dev *idev);
622c81d5
HFS		 134static int ipv6_generate_stable_address(struct in6_addr *addr,
135 u8 dad_count,
136 const struct inet6_dev *idev);
1da177e4
LT		 137
138/*
139 * Configured unicast address hash table
140 */
c2e21293 141static struct hlist_head inet6_addr_lst[IN6_ADDR_HSIZE];
5c578aed 142static DEFINE_SPINLOCK(addrconf_hash_lock);
1da177e4 143
c15b1cca
HFS		 144static void addrconf_verify(void);
145static void addrconf_verify_rtnl(void);
146static void addrconf_verify_work(struct work_struct *);
1da177e4 147
c15b1cca
HFS		 148static struct workqueue_struct *addrconf_wq;
149static DECLARE_DELAYED_WORK(addr_chk_work, addrconf_verify_work);
1da177e4
LT		 150
151static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
152static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
153
93d9b7d7
JP		 154static void addrconf_type_change(struct net_device *dev,
155 unsigned long event);
1da177e4
LT		 156static int addrconf_ifdown(struct net_device *dev, int how);
157
21caa662
RK		 158static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
159 int plen,
160 const struct net_device *dev,
161 u32 flags, u32 noflags);
162
cf22f9a2 163static void addrconf_dad_start(struct inet6_ifaddr *ifp);
c15b1cca 164static void addrconf_dad_work(struct work_struct *w);
1da177e4 165static void addrconf_dad_completed(struct inet6_ifaddr *ifp);
c5e33bdd 166static void addrconf_dad_run(struct inet6_dev *idev);
1da177e4
LT		 167static void addrconf_rs_timer(unsigned long data);
168static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
169static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
170
1ab1457c 171static void inet6_prefix_notify(int event, struct inet6_dev *idev,
1da177e4 172 struct prefix_info *pinfo);
3e81c6da
DM		 173static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
174 struct net_device *dev);
1da177e4 175
888c848e 176static struct ipv6_devconf ipv6_devconf __read_mostly = {
1da177e4
LT		 177 .forwarding = 0,
178 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
179 .mtu6 = IPV6_MIN_MTU,
180 .accept_ra = 1,
181 .accept_redirects = 1,
182 .autoconf = 1,
183 .force_mld_version = 0,
fc4eba58
HFS		 184 .mldv1_unsolicited_report_interval = 10 * HZ,
185 .mldv2_unsolicited_report_interval = HZ,
1da177e4
LT		 186 .dad_transmits = 1,
187 .rtr_solicits = MAX_RTR_SOLICITATIONS,
188 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
189 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
67ba4152 190 .use_tempaddr = 0,
1da177e4
LT		 191 .temp_valid_lft = TEMP_VALID_LIFETIME,
192 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
193 .regen_max_retry = REGEN_MAX_RETRY,
194 .max_desync_factor = MAX_DESYNC_FACTOR,
1da177e4 195 .max_addresses = IPV6_MAX_ADDRESSES,
65f5c7c1 196 .accept_ra_defrtr = 1,
d9333196 197 .accept_ra_from_local = 0,
8013d1d7 198 .accept_ra_min_hop_limit= 1,
c4fd30eb 199 .accept_ra_pinfo = 1,
930d6ff2
YH		 200#ifdef CONFIG_IPV6_ROUTER_PREF
201 .accept_ra_rtr_pref = 1,
52e16356 202 .rtr_probe_interval = 60 * HZ,
09c884d4
YH		 203#ifdef CONFIG_IPV6_ROUTE_INFO
204 .accept_ra_rt_info_max_plen = 0,
205#endif
930d6ff2 206#endif
fbea49e1 207 .proxy_ndp = 0,
0bcbc926 208 .accept_source_route = 0, /* we do not accept RH0 by default. */
778d80be 209 .disable_ipv6 = 0,
1b34be74 210 .accept_dad = 1,
b800c3b9 211 .suppress_frag_ndisc = 1,
c2943f14 212 .accept_ra_mtu = 1,
3d1bec99
HFS		 213 .stable_secret = {
214 .initialized = false,
3985e8a3
EK		 215 },
216 .use_oif_addrs_only = 0,
35103d11 217 .ignore_routes_with_linkdown = 0,
1da177e4
LT		 218};
219
ab32ea5d 220static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
1da177e4
LT		 221 .forwarding = 0,
222 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
223 .mtu6 = IPV6_MIN_MTU,
224 .accept_ra = 1,
225 .accept_redirects = 1,
226 .autoconf = 1,
fc4eba58
HFS		 227 .force_mld_version = 0,
228 .mldv1_unsolicited_report_interval = 10 * HZ,
229 .mldv2_unsolicited_report_interval = HZ,
1da177e4
LT		 230 .dad_transmits = 1,
231 .rtr_solicits = MAX_RTR_SOLICITATIONS,
232 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
233 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
1da177e4
LT		 234 .use_tempaddr = 0,
235 .temp_valid_lft = TEMP_VALID_LIFETIME,
236 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
237 .regen_max_retry = REGEN_MAX_RETRY,
238 .max_desync_factor = MAX_DESYNC_FACTOR,
1da177e4 239 .max_addresses = IPV6_MAX_ADDRESSES,
65f5c7c1 240 .accept_ra_defrtr = 1,
d9333196 241 .accept_ra_from_local = 0,
8013d1d7 242 .accept_ra_min_hop_limit= 1,
c4fd30eb 243 .accept_ra_pinfo = 1,
930d6ff2
YH		 244#ifdef CONFIG_IPV6_ROUTER_PREF
245 .accept_ra_rtr_pref = 1,
52e16356 246 .rtr_probe_interval = 60 * HZ,
09c884d4
YH		 247#ifdef CONFIG_IPV6_ROUTE_INFO
248 .accept_ra_rt_info_max_plen = 0,
249#endif
930d6ff2 250#endif
fbea49e1 251 .proxy_ndp = 0,
0bcbc926 252 .accept_source_route = 0, /* we do not accept RH0 by default. */
778d80be 253 .disable_ipv6 = 0,
1b34be74 254 .accept_dad = 1,
b800c3b9 255 .suppress_frag_ndisc = 1,
c2943f14 256 .accept_ra_mtu = 1,
3d1bec99
HFS		 257 .stable_secret = {
258 .initialized = false,
259 },
3985e8a3 260 .use_oif_addrs_only = 0,
35103d11 261 .ignore_routes_with_linkdown = 0,
1da177e4
LT		 262};
263
f24e3d65 264/* Check if a valid qdisc is available */
05297949 265static inline bool addrconf_qdisc_ok(const struct net_device *dev)
f24e3d65 266{
05297949 267 return !qdisc_tx_is_noop(dev);
f24e3d65
MC		 268}
269
b7b1bfce 270static void addrconf_del_rs_timer(struct inet6_dev *idev)
1da177e4 271{
b7b1bfce
HFS		 272 if (del_timer(&idev->rs_timer))
273 __in6_dev_put(idev);
274}
275
c15b1cca 276static void addrconf_del_dad_work(struct inet6_ifaddr *ifp)
b7b1bfce 277{
c15b1cca 278 if (cancel_delayed_work(&ifp->dad_work))
1da177e4
LT		 279 __in6_ifa_put(ifp);
280}
281
b7b1bfce
HFS		 282static void addrconf_mod_rs_timer(struct inet6_dev *idev,
283 unsigned long when)
284{
285 if (!timer_pending(&idev->rs_timer))
286 in6_dev_hold(idev);
287 mod_timer(&idev->rs_timer, jiffies + when);
288}
1da177e4 289
c15b1cca
HFS		 290static void addrconf_mod_dad_work(struct inet6_ifaddr *ifp,
291 unsigned long delay)
1da177e4 292{
c15b1cca 293 if (!delayed_work_pending(&ifp->dad_work))
1da177e4 294 in6_ifa_hold(ifp);
c15b1cca 295 mod_delayed_work(addrconf_wq, &ifp->dad_work, delay);
1da177e4
LT		 296}
297
7f7d9a6b
HX		 298static int snmp6_alloc_dev(struct inet6_dev *idev)
299{
827da44c
JS		 300 int i;
301
698365fa
WC		 302 idev->stats.ipv6 = alloc_percpu(struct ipstats_mib);
303 if (!idev->stats.ipv6)
7f7d9a6b 304 goto err_ip;
827da44c
JS		 305
306 for_each_possible_cpu(i) {
307 struct ipstats_mib *addrconf_stats;
698365fa 308 addrconf_stats = per_cpu_ptr(idev->stats.ipv6, i);
827da44c 309 u64_stats_init(&addrconf_stats->syncp);
827da44c
JS		 310 }
311
312
be281e55
ED		 313 idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device),
314 GFP_KERNEL);
315 if (!idev->stats.icmpv6dev)
7f7d9a6b 316 goto err_icmp;
be281e55
ED		 317 idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device),
318 GFP_KERNEL);
319 if (!idev->stats.icmpv6msgdev)
14878f75 320 goto err_icmpmsg;
7f7d9a6b
HX		 321
322 return 0;
323
14878f75 324err_icmpmsg:
be281e55 325 kfree(idev->stats.icmpv6dev);
7f7d9a6b 326err_icmp:
698365fa 327 free_percpu(idev->stats.ipv6);
7f7d9a6b 328err_ip:
aaf70ec7 329 return -ENOMEM;
7f7d9a6b
HX		 330}
331
8e5e8f30 332static struct inet6_dev *ipv6_add_dev(struct net_device *dev)
1da177e4
LT		 333{
334 struct inet6_dev *ndev;
a317a2f1 335 int err = -ENOMEM;
1da177e4
LT		 336
337 ASSERT_RTNL();
338
339 if (dev->mtu < IPV6_MIN_MTU)
a317a2f1 340 return ERR_PTR(-EINVAL);
1da177e4 341
1ab1457c 342 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
63159f29 343 if (!ndev)
a317a2f1 344 return ERR_PTR(err);
322f74a4
IO		 345
346 rwlock_init(&ndev->lock);
347 ndev->dev = dev;
502a2ffd 348 INIT_LIST_HEAD(&ndev->addr_list);
b7b1bfce
HFS		 349 setup_timer(&ndev->rs_timer, addrconf_rs_timer,
350 (unsigned long)ndev);
c346dca1 351 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf));
322f74a4
IO		 352 ndev->cnf.mtu6 = dev->mtu;
353 ndev->cnf.sysctl = NULL;
354 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
63159f29 355 if (!ndev->nd_parms) {
322f74a4 356 kfree(ndev);
a317a2f1 357 return ERR_PTR(err);
322f74a4 358 }
0187bdfb
BH		 359 if (ndev->cnf.forwarding)
360 dev_disable_lro(dev);
322f74a4
IO		 361 /* We refer to the device */
362 dev_hold(dev);
1da177e4 363
322f74a4 364 if (snmp6_alloc_dev(ndev) < 0) {
ba3542e1 365 ADBG(KERN_WARNING
f3213831 366 "%s: cannot allocate memory for statistics; dev=%s.\n",
ba3542e1 367 __func__, dev->name);
322f74a4 368 neigh_parms_release(&nd_tbl, ndev->nd_parms);
8603e33d
RL		 369 dev_put(dev);
370 kfree(ndev);
a317a2f1 371 return ERR_PTR(err);
322f74a4 372 }
1da177e4 373
322f74a4 374 if (snmp6_register_dev(ndev) < 0) {
ba3542e1 375 ADBG(KERN_WARNING
f3213831 376 "%s: cannot create /proc/net/dev_snmp6/%s\n",
ba3542e1 377 __func__, dev->name);
a317a2f1 378 goto err_release;
322f74a4
IO		 379 }
380
381 /* One reference from device. We must do this before
382 * we invoke __ipv6_regen_rndid().
383 */
384 in6_dev_hold(ndev);
1da177e4 385
1b34be74
YH		 386 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
387 ndev->cnf.accept_dad = -1;
388
07a93626 389#if IS_ENABLED(CONFIG_IPV6_SIT)
b077d7ab 390 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
f3213831 391 pr_info("%s: Disabled Multicast RS\n", dev->name);
b077d7ab
YH		 392 ndev->cnf.rtr_solicits = 0;
393 }
394#endif
395
372e6c8f 396 INIT_LIST_HEAD(&ndev->tempaddr_list);
b24b8a24 397 setup_timer(&ndev->regen_timer, ipv6_regen_rndid, (unsigned long)ndev);
322f74a4
IO		 398 if ((dev->flags&IFF_LOOPBACK) ||
399 dev->type == ARPHRD_TUNNEL ||
9625ed72 400 dev->type == ARPHRD_TUNNEL6 ||
0be669bb 401 dev->type == ARPHRD_SIT ||
0be669bb 402 dev->type == ARPHRD_NONE) {
322f74a4
IO		 403 ndev->cnf.use_tempaddr = -1;
404 } else {
405 in6_dev_hold(ndev);
406 ipv6_regen_rndid((unsigned long) ndev);
407 }
5d9efa7e 408
914faa14 409 ndev->token = in6addr_any;
1da177e4 410
f24e3d65 411 if (netif_running(dev) && addrconf_qdisc_ok(dev))
53aadcc9
HX		 412 ndev->if_flags |= IF_READY;
413
322f74a4
IO		 414 ipv6_mc_init_dev(ndev);
415 ndev->tstamp = jiffies;
a317a2f1
WC		 416 err = addrconf_sysctl_register(ndev);
417 if (err) {
418 ipv6_mc_destroy_dev(ndev);
419 del_timer(&ndev->regen_timer);
420 goto err_release;
421 }
30c4cf57 422 /* protected by rtnl_lock */
cf778b00 423 rcu_assign_pointer(dev->ip6_ptr, ndev);
d88ae4cc 424
2c5e8933
HFS		 425 /* Join interface-local all-node multicast group */
426 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allnodes);
427
d88ae4cc 428 /* Join all-node multicast group */
f3ee4010 429 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);
d88ae4cc 430
d6ddef9e 431 /* Join all-router multicast group if forwarding is set */
8b2aaede 432 if (ndev->cnf.forwarding && (dev->flags & IFF_MULTICAST))
d6ddef9e
LW		 433 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
434
1da177e4 435 return ndev;
a317a2f1
WC		 436
437err_release:
438 neigh_parms_release(&nd_tbl, ndev->nd_parms);
439 ndev->dead = 1;
440 in6_dev_finish_destroy(ndev);
441 return ERR_PTR(err);
1da177e4
LT		 442}
443
8e5e8f30 444static struct inet6_dev *ipv6_find_idev(struct net_device *dev)
1da177e4
LT		 445{
446 struct inet6_dev *idev;
447
448 ASSERT_RTNL();
449
e21e8467
SH		 450 idev = __in6_dev_get(dev);
451 if (!idev) {
452 idev = ipv6_add_dev(dev);
a317a2f1 453 if (IS_ERR(idev))
1da177e4
LT		 454 return NULL;
455 }
c5e33bdd 456
1da177e4
LT		 457 if (dev->flags&IFF_UP)
458 ipv6_mc_up(idev);
459 return idev;
460}
461
f3a1bfb1
ND		 462static int inet6_netconf_msgsize_devconf(int type)
463{
464 int size = NLMSG_ALIGN(sizeof(struct netconfmsg))
465 + nla_total_size(4); /* NETCONFA_IFINDEX */
466
76f8f6cb
ND		 467 /* type -1 is used for ALL */
468 if (type == -1 || type == NETCONFA_FORWARDING)
f3a1bfb1 469 size += nla_total_size(4);
b1afce95 470#ifdef CONFIG_IPV6_MROUTE
d67b8c61
ND		 471 if (type == -1 || type == NETCONFA_MC_FORWARDING)
472 size += nla_total_size(4);
b1afce95 473#endif
c92d5491 474 if (type == -1 || type == NETCONFA_PROXY_NEIGH)
475 size += nla_total_size(4);
f3a1bfb1 476
35103d11
AG		 477 if (type == -1 || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN)
478 size += nla_total_size(4);
479
f3a1bfb1
ND		 480 return size;
481}
482
483static int inet6_netconf_fill_devconf(struct sk_buff *skb, int ifindex,
484 struct ipv6_devconf *devconf, u32 portid,
485 u32 seq, int event, unsigned int flags,
486 int type)
487{
488 struct nlmsghdr *nlh;
489 struct netconfmsg *ncm;
490
491 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg),
492 flags);
63159f29 493 if (!nlh)
f3a1bfb1
ND		 494 return -EMSGSIZE;
495
496 ncm = nlmsg_data(nlh);
497 ncm->ncm_family = AF_INET6;
498
499 if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0)
500 goto nla_put_failure;
501
76f8f6cb
ND		 502 /* type -1 is used for ALL */
503 if ((type == -1 || type == NETCONFA_FORWARDING) &&
f3a1bfb1
ND		 504 nla_put_s32(skb, NETCONFA_FORWARDING, devconf->forwarding) < 0)
505 goto nla_put_failure;
b1afce95 506#ifdef CONFIG_IPV6_MROUTE
d67b8c61
ND		 507 if ((type == -1 || type == NETCONFA_MC_FORWARDING) &&
508 nla_put_s32(skb, NETCONFA_MC_FORWARDING,
509 devconf->mc_forwarding) < 0)
510 goto nla_put_failure;
b1afce95 511#endif
c92d5491 512 if ((type == -1 || type == NETCONFA_PROXY_NEIGH) &&
513 nla_put_s32(skb, NETCONFA_PROXY_NEIGH, devconf->proxy_ndp) < 0)
514 goto nla_put_failure;
515
35103d11
AG		 516 if ((type == -1 || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN) &&
517 nla_put_s32(skb, NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
518 devconf->ignore_routes_with_linkdown) < 0)
519 goto nla_put_failure;
520
053c095a
JB		 521 nlmsg_end(skb, nlh);
522 return 0;
f3a1bfb1
ND		 523
524nla_put_failure:
525 nlmsg_cancel(skb, nlh);
526 return -EMSGSIZE;
527}
528
d67b8c61
ND		 529void inet6_netconf_notify_devconf(struct net *net, int type, int ifindex,
530 struct ipv6_devconf *devconf)
f3a1bfb1
ND		 531{
532 struct sk_buff *skb;
533 int err = -ENOBUFS;
534
535 skb = nlmsg_new(inet6_netconf_msgsize_devconf(type), GFP_ATOMIC);
63159f29 536 if (!skb)
f3a1bfb1
ND		 537 goto errout;
538
539 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 0, 0,
540 RTM_NEWNETCONF, 0, type);
541 if (err < 0) {
542 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
543 WARN_ON(err == -EMSGSIZE);
544 kfree_skb(skb);
545 goto errout;
546 }
547 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_NETCONF, NULL, GFP_ATOMIC);
548 return;
549errout:
bd779028 550 rtnl_set_sk_err(net, RTNLGRP_IPV6_NETCONF, err);
f3a1bfb1
ND		 551}
552
76f8f6cb
ND		 553static const struct nla_policy devconf_ipv6_policy[NETCONFA_MAX+1] = {
554 [NETCONFA_IFINDEX] = { .len = sizeof(int) },
555 [NETCONFA_FORWARDING] = { .len = sizeof(int) },
c92d5491 556 [NETCONFA_PROXY_NEIGH] = { .len = sizeof(int) },
35103d11 557 [NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN] = { .len = sizeof(int) },
76f8f6cb
ND		 558};
559
560static int inet6_netconf_get_devconf(struct sk_buff *in_skb,
661d2967 561 struct nlmsghdr *nlh)
76f8f6cb
ND		 562{
563 struct net *net = sock_net(in_skb->sk);
564 struct nlattr *tb[NETCONFA_MAX+1];
565 struct netconfmsg *ncm;
566 struct sk_buff *skb;
567 struct ipv6_devconf *devconf;
568 struct inet6_dev *in6_dev;
569 struct net_device *dev;
570 int ifindex;
571 int err;
572
573 err = nlmsg_parse(nlh, sizeof(*ncm), tb, NETCONFA_MAX,
574 devconf_ipv6_policy);
575 if (err < 0)
576 goto errout;
577
578 err = EINVAL;
579 if (!tb[NETCONFA_IFINDEX])
580 goto errout;
581
582 ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]);
583 switch (ifindex) {
584 case NETCONFA_IFINDEX_ALL:
585 devconf = net->ipv6.devconf_all;
586 break;
587 case NETCONFA_IFINDEX_DEFAULT:
588 devconf = net->ipv6.devconf_dflt;
589 break;
590 default:
591 dev = __dev_get_by_index(net, ifindex);
63159f29 592 if (!dev)
76f8f6cb
ND		 593 goto errout;
594 in6_dev = __in6_dev_get(dev);
63159f29 595 if (!in6_dev)
76f8f6cb
ND		 596 goto errout;
597 devconf = &in6_dev->cnf;
598 break;
599 }
600
601 err = -ENOBUFS;
602 skb = nlmsg_new(inet6_netconf_msgsize_devconf(-1), GFP_ATOMIC);
63159f29 603 if (!skb)
76f8f6cb
ND		 604 goto errout;
605
606 err = inet6_netconf_fill_devconf(skb, ifindex, devconf,
607 NETLINK_CB(in_skb).portid,
608 nlh->nlmsg_seq, RTM_NEWNETCONF, 0,
609 -1);
610 if (err < 0) {
611 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
612 WARN_ON(err == -EMSGSIZE);
613 kfree_skb(skb);
614 goto errout;
615 }
616 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
617errout:
618 return err;
619}
620
7a674200
ND		 621static int inet6_netconf_dump_devconf(struct sk_buff *skb,
622 struct netlink_callback *cb)
623{
624 struct net *net = sock_net(skb->sk);
625 int h, s_h;
626 int idx, s_idx;
627 struct net_device *dev;
628 struct inet6_dev *idev;
629 struct hlist_head *head;
630
631 s_h = cb->args[0];
632 s_idx = idx = cb->args[1];
633
634 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
635 idx = 0;
636 head = &net->dev_index_head[h];
637 rcu_read_lock();
63998ac2
ND		 638 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^
639 net->dev_base_seq;
7a674200
ND		 640 hlist_for_each_entry_rcu(dev, head, index_hlist) {
641 if (idx < s_idx)
642 goto cont;
643 idev = __in6_dev_get(dev);
644 if (!idev)
645 goto cont;
646
647 if (inet6_netconf_fill_devconf(skb, dev->ifindex,
648 &idev->cnf,
649 NETLINK_CB(cb->skb).portid,
650 cb->nlh->nlmsg_seq,
651 RTM_NEWNETCONF,
652 NLM_F_MULTI,
053c095a 653 -1) < 0) {
7a674200
ND		 654 rcu_read_unlock();
655 goto done;
656 }
63998ac2 657 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
7a674200
ND		 658cont:
659 idx++;
660 }
661 rcu_read_unlock();
662 }
663 if (h == NETDEV_HASHENTRIES) {
664 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL,
665 net->ipv6.devconf_all,
666 NETLINK_CB(cb->skb).portid,
667 cb->nlh->nlmsg_seq,
668 RTM_NEWNETCONF, NLM_F_MULTI,
053c095a 669 -1) < 0)
7a674200
ND		 670 goto done;
671 else
672 h++;
673 }
674 if (h == NETDEV_HASHENTRIES + 1) {
675 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT,
676 net->ipv6.devconf_dflt,
677 NETLINK_CB(cb->skb).portid,
678 cb->nlh->nlmsg_seq,
679 RTM_NEWNETCONF, NLM_F_MULTI,
053c095a 680 -1) < 0)
7a674200
ND		 681 goto done;
682 else
683 h++;
684 }
685done:
686 cb->args[0] = h;
687 cb->args[1] = idx;
688
689 return skb->len;
690}
691
1da177e4
LT		 692#ifdef CONFIG_SYSCTL
693static void dev_forward_change(struct inet6_dev *idev)
694{
695 struct net_device *dev;
696 struct inet6_ifaddr *ifa;
1da177e4
LT		 697
698 if (!idev)
699 return;
700 dev = idev->dev;
0187bdfb
BH		 701 if (idev->cnf.forwarding)
702 dev_disable_lro(dev);
1a940835 703 if (dev->flags & IFF_MULTICAST) {
2c5e8933 704 if (idev->cnf.forwarding) {
f3ee4010 705 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
2c5e8933
HFS		 706 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allrouters);
707 ipv6_dev_mc_inc(dev, &in6addr_sitelocal_allrouters);
708 } else {
f3ee4010 709 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
2c5e8933
HFS		 710 ipv6_dev_mc_dec(dev, &in6addr_interfacelocal_allrouters);
711 ipv6_dev_mc_dec(dev, &in6addr_sitelocal_allrouters);
712 }
1da177e4 713 }
502a2ffd 714
715 list_for_each_entry(ifa, &idev->addr_list, if_list) {
2c12a74c
MW		 716 if (ifa->flags&IFA_F_TENTATIVE)
717 continue;
1da177e4
LT		 718 if (idev->cnf.forwarding)
719 addrconf_join_anycast(ifa);
720 else
721 addrconf_leave_anycast(ifa);
722 }
f3a1bfb1
ND		 723 inet6_netconf_notify_devconf(dev_net(dev), NETCONFA_FORWARDING,
724 dev->ifindex, &idev->cnf);
1da177e4
LT		 725}
726
727
e186932b 728static void addrconf_forward_change(struct net *net, __s32 newf)
1da177e4
LT		 729{
730 struct net_device *dev;
731 struct inet6_dev *idev;
732
4acd4945 733 for_each_netdev(net, dev) {
1da177e4
LT		 734 idev = __in6_dev_get(dev);
735 if (idev) {
e186932b
PE		 736 int changed = (!idev->cnf.forwarding) ^ (!newf);
737 idev->cnf.forwarding = newf;
1da177e4
LT		 738 if (changed)
739 dev_forward_change(idev);
740 }
1da177e4 741 }
1da177e4 742}
c8fecf22 743
013d97e9 744static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf)
c8fecf22 745{
bff16c2f 746 struct net *net;
013d97e9
FR		 747 int old;
748
749 if (!rtnl_trylock())
750 return restart_syscall();
bff16c2f
PE		 751
752 net = (struct net *)table->extra2;
013d97e9
FR		 753 old = *p;
754 *p = newf;
b325fddb 755
013d97e9 756 if (p == &net->ipv6.devconf_dflt->forwarding) {
f3a1bfb1
ND		 757 if ((!newf) ^ (!old))
758 inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING,
759 NETCONFA_IFINDEX_DEFAULT,
760 net->ipv6.devconf_dflt);
013d97e9
FR		 761 rtnl_unlock();
762 return 0;
88af182e 763 }
c8fecf22 764
e186932b 765 if (p == &net->ipv6.devconf_all->forwarding) {
e186932b
PE		 766 net->ipv6.devconf_dflt->forwarding = newf;
767 addrconf_forward_change(net, newf);
f3a1bfb1
ND		 768 if ((!newf) ^ (!old))
769 inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING,
770 NETCONFA_IFINDEX_ALL,
771 net->ipv6.devconf_all);
013d97e9 772 } else if ((!newf) ^ (!old))
c8fecf22 773 dev_forward_change((struct inet6_dev *)table->extra1);
0187bdfb 774 rtnl_unlock();
c8fecf22 775
013d97e9 776 if (newf)
7b4da532 777 rt6_purge_dflt_routers(net);
b325fddb 778 return 1;
c8fecf22 779}
35103d11
AG		 780
781static void addrconf_linkdown_change(struct net *net, __s32 newf)
782{
783 struct net_device *dev;
784 struct inet6_dev *idev;
785
786 for_each_netdev(net, dev) {
787 idev = __in6_dev_get(dev);
788 if (idev) {
789 int changed = (!idev->cnf.ignore_routes_with_linkdown) ^ (!newf);
790
791 idev->cnf.ignore_routes_with_linkdown = newf;
792 if (changed)
793 inet6_netconf_notify_devconf(dev_net(dev),
794 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
795 dev->ifindex,
796 &idev->cnf);
797 }
798 }
799}
800
801static int addrconf_fixup_linkdown(struct ctl_table *table, int *p, int newf)
802{
803 struct net *net;
804 int old;
805
806 if (!rtnl_trylock())
807 return restart_syscall();
808
809 net = (struct net *)table->extra2;
810 old = *p;
811 *p = newf;
812
813 if (p == &net->ipv6.devconf_dflt->ignore_routes_with_linkdown) {
814 if ((!newf) ^ (!old))
815 inet6_netconf_notify_devconf(net,
816 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
817 NETCONFA_IFINDEX_DEFAULT,
818 net->ipv6.devconf_dflt);
819 rtnl_unlock();
820 return 0;
821 }
822
823 if (p == &net->ipv6.devconf_all->ignore_routes_with_linkdown) {
824 net->ipv6.devconf_dflt->ignore_routes_with_linkdown = newf;
825 addrconf_linkdown_change(net, newf);
826 if ((!newf) ^ (!old))
827 inet6_netconf_notify_devconf(net,
828 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
829 NETCONFA_IFINDEX_ALL,
830 net->ipv6.devconf_all);
831 }
832 rtnl_unlock();
833
834 return 1;
835}
836
1da177e4
LT		 837#endif
838
5c578aed 839/* Nobody refers to this ifaddr, destroy it */
1da177e4
LT		 840void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
841{
c2e21293 842 WARN_ON(!hlist_unhashed(&ifp->addr_lst));
547b792c 843
1da177e4 844#ifdef NET_REFCNT_DEBUG
91df42be 845 pr_debug("%s\n", __func__);
1da177e4
LT		 846#endif
847
848 in6_dev_put(ifp->idev);
849
c15b1cca
HFS		 850 if (cancel_delayed_work(&ifp->dad_work))
851 pr_notice("delayed DAD work was pending while freeing ifa=%p\n",
852 ifp);
1da177e4 853
e9d3e084 854 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
f3213831 855 pr_warn("Freeing alive inet6 address %p\n", ifp);
1da177e4
LT		 856 return;
857 }
94e187c0 858 ip6_rt_put(ifp->rt);
1da177e4 859
e5785985 860 kfree_rcu(ifp, rcu);
1da177e4
LT		 861}
862
e55ffac6
BH		 863static void
864ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
865{
502a2ffd 866 struct list_head *p;
8a6ce0c0 867 int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
e55ffac6
BH		 868
869 /*
870 * Each device address list is sorted in order of scope -
871 * global before linklocal.
872 */
502a2ffd 873 list_for_each(p, &idev->addr_list) {
874 struct inet6_ifaddr *ifa
875 = list_entry(p, struct inet6_ifaddr, if_list);
8a6ce0c0 876 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
e55ffac6
BH		 877 break;
878 }
879
b54c9b98 880 list_add_tail(&ifp->if_list, p);
e55ffac6
BH		 881}
882
ddbe5032 883static u32 inet6_addr_hash(const struct in6_addr *addr)
3eb84f49 884{
ddbe5032 885 return hash_32(ipv6_addr_hash(addr), IN6_ADDR_HSIZE_SHIFT);
3eb84f49
YH		 886}
887
1da177e4
LT		 888/* On success it returns ifp with increased reference count */
889
890static struct inet6_ifaddr *
3f8f5298
JP		 891ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
892 const struct in6_addr *peer_addr, int pfxlen,
8a226b2c 893 int scope, u32 flags, u32 valid_lft, u32 prefered_lft)
1da177e4
LT		 894{
895 struct inet6_ifaddr *ifa = NULL;
896 struct rt6_info *rt;
3a88a81d 897 unsigned int hash;
1da177e4 898 int err = 0;
d68b8270
YH		 899 int addr_type = ipv6_addr_type(addr);
900
901 if (addr_type == IPV6_ADDR_ANY ||
902 addr_type & IPV6_ADDR_MULTICAST ||
903 (!(idev->dev->flags & IFF_LOOPBACK) &&
904 addr_type & IPV6_ADDR_LOOPBACK))
905 return ERR_PTR(-EADDRNOTAVAIL);
1da177e4 906
8814c4b5 907 rcu_read_lock_bh();
1da177e4
LT		 908 if (idev->dead) {
909 err = -ENODEV; /*XXX*/
910 goto out2;
911 }
912
56d417b1 913 if (idev->cnf.disable_ipv6) {
9bdd8d40
BH		 914 err = -EACCES;
915 goto out2;
916 }
917
5c578aed 918 spin_lock(&addrconf_hash_lock);
1da177e4
LT		 919
920 /* Ignore adding duplicate addresses on an interface */
c346dca1 921 if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) {
ba3542e1 922 ADBG("ipv6_add_addr: already assigned\n");
1da177e4
LT		 923 err = -EEXIST;
924 goto out;
925 }
926
322f74a4 927 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
1da177e4 928
63159f29 929 if (!ifa) {
ba3542e1 930 ADBG("ipv6_add_addr: malloc failed\n");
1da177e4
LT		 931 err = -ENOBUFS;
932 goto out;
933 }
934
8f031519 935 rt = addrconf_dst_alloc(idev, addr, false);
1da177e4
LT		 936 if (IS_ERR(rt)) {
937 err = PTR_ERR(rt);
938 goto out;
939 }
940
bba24896
JP		 941 neigh_parms_data_state_setall(idev->nd_parms);
942
4e3fd7a0 943 ifa->addr = *addr;
3f8f5298
JP		 944 if (peer_addr)
945 ifa->peer_addr = *peer_addr;
1da177e4
LT		 946
947 spin_lock_init(&ifa->lock);
c15b1cca 948 INIT_DELAYED_WORK(&ifa->dad_work, addrconf_dad_work);
c2e21293 949 INIT_HLIST_NODE(&ifa->addr_lst);
1da177e4
LT		 950 ifa->scope = scope;
951 ifa->prefix_len = pfxlen;
952 ifa->flags = flags | IFA_F_TENTATIVE;
8a226b2c
JB		 953 ifa->valid_lft = valid_lft;
954 ifa->prefered_lft = prefered_lft;
1da177e4 955 ifa->cstamp = ifa->tstamp = jiffies;
617fe29d 956 ifa->tokenized = false;
1da177e4 957
57f5f544
KF		 958 ifa->rt = rt;
959
1da177e4
LT		 960 ifa->idev = idev;
961 in6_dev_hold(idev);
962 /* For caller */
963 in6_ifa_hold(ifa);
964
965 /* Add to big hash table */
ddbe5032 966 hash = inet6_addr_hash(addr);
1da177e4 967
5c578aed 968 hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]);
5c578aed 969 spin_unlock(&addrconf_hash_lock);
1da177e4
LT		 970
971 write_lock(&idev->lock);
972 /* Add to inet6_dev unicast addr list. */
e55ffac6 973 ipv6_link_dev_addr(idev, ifa);
1da177e4 974
1da177e4 975 if (ifa->flags&IFA_F_TEMPORARY) {
372e6c8f 976 list_add(&ifa->tmp_list, &idev->tempaddr_list);
1da177e4
LT		 977 in6_ifa_hold(ifa);
978 }
1da177e4 979
1da177e4
LT		 980 in6_ifa_hold(ifa);
981 write_unlock(&idev->lock);
982out2:
8814c4b5 983 rcu_read_unlock_bh();
1da177e4 984
fd92833a 985 if (likely(err == 0))
f88c91dd 986 inet6addr_notifier_call_chain(NETDEV_UP, ifa);
1da177e4
LT		 987 else {
988 kfree(ifa);
989 ifa = ERR_PTR(err);
990 }
991
992 return ifa;
993out:
5c578aed 994 spin_unlock(&addrconf_hash_lock);
1da177e4
LT		 995 goto out2;
996}
997
5b84efec
TH		 998enum cleanup_prefix_rt_t {
999 CLEANUP_PREFIX_RT_NOP, /* no cleanup action for prefix route */
1000 CLEANUP_PREFIX_RT_DEL, /* delete the prefix route */
1001 CLEANUP_PREFIX_RT_EXPIRE, /* update the lifetime of the prefix route */
1002};
1003
1004/*
1005 * Check, whether the prefix for ifp would still need a prefix route
1006 * after deleting ifp. The function returns one of the CLEANUP_PREFIX_RT_*
1007 * constants.
1008 *
1009 * 1) we don't purge prefix if address was not permanent.
1010 * prefix is managed by its own lifetime.
1011 * 2) we also don't purge, if the address was IFA_F_NOPREFIXROUTE.
1012 * 3) if there are no addresses, delete prefix.
1013 * 4) if there are still other permanent address(es),
1014 * corresponding prefix is still permanent.
1015 * 5) if there are still other addresses with IFA_F_NOPREFIXROUTE,
1016 * don't purge the prefix, assume user space is managing it.
1017 * 6) otherwise, update prefix lifetime to the
1018 * longest valid lifetime among the corresponding
1019 * addresses on the device.
1020 * Note: subsequent RA will update lifetime.
1021 **/
1022static enum cleanup_prefix_rt_t
1023check_cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long *expires)
1024{
1025 struct inet6_ifaddr *ifa;
1026 struct inet6_dev *idev = ifp->idev;
1027 unsigned long lifetime;
1028 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_DEL;
1029
1030 *expires = jiffies;
1031
1032 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1033 if (ifa == ifp)
1034 continue;
1035 if (!ipv6_prefix_equal(&ifa->addr, &ifp->addr,
1036 ifp->prefix_len))
1037 continue;
1038 if (ifa->flags & (IFA_F_PERMANENT | IFA_F_NOPREFIXROUTE))
1039 return CLEANUP_PREFIX_RT_NOP;
1040
1041 action = CLEANUP_PREFIX_RT_EXPIRE;
1042
1043 spin_lock(&ifa->lock);
1044
1045 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
1046 /*
1047 * Note: Because this address is
1048 * not permanent, lifetime <
1049 * LONG_MAX / HZ here.
1050 */
1051 if (time_before(*expires, ifa->tstamp + lifetime * HZ))
1052 *expires = ifa->tstamp + lifetime * HZ;
1053 spin_unlock(&ifa->lock);
1054 }
1055
1056 return action;
1057}
1058
1059static void
1060cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long expires, bool del_rt)
1061{
1062 struct rt6_info *rt;
1063
1064 rt = addrconf_get_prefix_route(&ifp->addr,
1065 ifp->prefix_len,
1066 ifp->idev->dev,
1067 0, RTF_GATEWAY | RTF_DEFAULT);
1068 if (rt) {
1069 if (del_rt)
1070 ip6_del_rt(rt);
1071 else {
1072 if (!(rt->rt6i_flags & RTF_EXPIRES))
1073 rt6_set_expires(rt, expires);
1074 ip6_rt_put(rt);
1075 }
1076 }
1077}
1078
1079
1da177e4
LT		 1080/* This function wants to get referenced ifp and releases it before return */
1081
1082static void ipv6_del_addr(struct inet6_ifaddr *ifp)
1083{
4c5ff6a6 1084 int state;
5b84efec
TH		 1085 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_NOP;
1086 unsigned long expires;
1da177e4 1087
c15b1cca
HFS		 1088 ASSERT_RTNL();
1089
8e8e676d 1090 spin_lock_bh(&ifp->lock);
4c5ff6a6 1091 state = ifp->state;
e9d3e084 1092 ifp->state = INET6_IFADDR_STATE_DEAD;
8e8e676d 1093 spin_unlock_bh(&ifp->lock);
4c5ff6a6
HX		 1094
1095 if (state == INET6_IFADDR_STATE_DEAD)
1096 goto out;
1da177e4 1097
5c578aed 1098 spin_lock_bh(&addrconf_hash_lock);
1099 hlist_del_init_rcu(&ifp->addr_lst);
5c578aed 1100 spin_unlock_bh(&addrconf_hash_lock);
1da177e4 1101
5b84efec 1102 write_lock_bh(&ifp->idev->lock);
5d9efa7e 1103
1da177e4 1104 if (ifp->flags&IFA_F_TEMPORARY) {
372e6c8f 1105 list_del(&ifp->tmp_list);
1106 if (ifp->ifpub) {
1107 in6_ifa_put(ifp->ifpub);
1108 ifp->ifpub = NULL;
1da177e4 1109 }
372e6c8f 1110 __in6_ifa_put(ifp);
1da177e4 1111 }
1da177e4 1112
5b84efec
TH		 1113 if (ifp->flags & IFA_F_PERMANENT && !(ifp->flags & IFA_F_NOPREFIXROUTE))
1114 action = check_cleanup_prefix_route(ifp, &expires);
502a2ffd 1115
5b84efec
TH		 1116 list_del_init(&ifp->if_list);
1117 __in6_ifa_put(ifp);
1118
1119 write_unlock_bh(&ifp->idev->lock);
1da177e4 1120
c15b1cca 1121 addrconf_del_dad_work(ifp);
b2238566 1122
1da177e4
LT		 1123 ipv6_ifa_notify(RTM_DELADDR, ifp);
1124
f88c91dd 1125 inet6addr_notifier_call_chain(NETDEV_DOWN, ifp);
1da177e4 1126
5b84efec
TH		 1127 if (action != CLEANUP_PREFIX_RT_NOP) {
1128 cleanup_prefix_route(ifp, expires,
1129 action == CLEANUP_PREFIX_RT_DEL);
1da177e4
LT		 1130 }
1131
c3968a85
DW		 1132 /* clean up prefsrc entries */
1133 rt6_remove_prefsrc(ifp);
4c5ff6a6 1134out:
1da177e4
LT		 1135 in6_ifa_put(ifp);
1136}
1137
1da177e4
LT		 1138static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
1139{
1140 struct inet6_dev *idev = ifp->idev;
1141 struct in6_addr addr, *tmpaddr;
76f793e3 1142 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_tstamp, age;
eac55bf9 1143 unsigned long regen_advance;
1da177e4
LT		 1144 int tmp_plen;
1145 int ret = 0;
95c385b4 1146 u32 addr_flags;
76f793e3 1147 unsigned long now = jiffies;
1da177e4 1148
53bd6749 1149 write_lock_bh(&idev->lock);
1da177e4
LT		 1150 if (ift) {
1151 spin_lock_bh(&ift->lock);
1152 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
1153 spin_unlock_bh(&ift->lock);
1154 tmpaddr = &addr;
1155 } else {
1156 tmpaddr = NULL;
1157 }
1158retry:
1159 in6_dev_hold(idev);
1160 if (idev->cnf.use_tempaddr <= 0) {
53bd6749 1161 write_unlock_bh(&idev->lock);
f3213831 1162 pr_info("%s: use_tempaddr is disabled\n", __func__);
1da177e4
LT		 1163 in6_dev_put(idev);
1164 ret = -1;
1165 goto out;
1166 }
1167 spin_lock_bh(&ifp->lock);
1168 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
1169 idev->cnf.use_tempaddr = -1; /*XXX*/
1170 spin_unlock_bh(&ifp->lock);
53bd6749 1171 write_unlock_bh(&idev->lock);
f3213831
JP		 1172 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n",
1173 __func__);
1da177e4
LT		 1174 in6_dev_put(idev);
1175 ret = -1;
1176 goto out;
1177 }
1178 in6_ifa_hold(ifp);
1179 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
eb7e0575 1180 __ipv6_try_regen_rndid(idev, tmpaddr);
1da177e4 1181 memcpy(&addr.s6_addr[8], idev->rndid, 8);
76f793e3 1182 age = (now - ifp->tstamp) / HZ;
1da177e4
LT		 1183 tmp_valid_lft = min_t(__u32,
1184 ifp->valid_lft,
7a876b0e 1185 idev->cnf.temp_valid_lft + age);
1ab1457c
YH		 1186 tmp_prefered_lft = min_t(__u32,
1187 ifp->prefered_lft,
7a876b0e 1188 idev->cnf.temp_prefered_lft + age -
784e2710 1189 idev->cnf.max_desync_factor);
1da177e4 1190 tmp_plen = ifp->prefix_len;
1da177e4
LT		 1191 tmp_tstamp = ifp->tstamp;
1192 spin_unlock_bh(&ifp->lock);
1193
eac55bf9 1194 regen_advance = idev->cnf.regen_max_retry *
67ba4152
IM		 1195 idev->cnf.dad_transmits *
1196 NEIGH_VAR(idev->nd_parms, RETRANS_TIME) / HZ;
53bd6749 1197 write_unlock_bh(&idev->lock);
95c385b4 1198
eac55bf9
BB		 1199 /* A temporary address is created only if this calculated Preferred
1200 * Lifetime is greater than REGEN_ADVANCE time units. In particular,
1201 * an implementation must not create a temporary address with a zero
1202 * Preferred Lifetime.
ecab6701
HK		 1203 * Use age calculation as in addrconf_verify to avoid unnecessary
1204 * temporary addresses being generated.
eac55bf9 1205 */
ecab6701
HK		 1206 age = (now - tmp_tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
1207 if (tmp_prefered_lft <= regen_advance + age) {
eac55bf9
BB		 1208 in6_ifa_put(ifp);
1209 in6_dev_put(idev);
1210 ret = -1;
1211 goto out;
1212 }
1213
95c385b4
NH		 1214 addr_flags = IFA_F_TEMPORARY;
1215 /* set in addrconf_prefix_rcv() */
1216 if (ifp->flags & IFA_F_OPTIMISTIC)
1217 addr_flags |= IFA_F_OPTIMISTIC;
1218
4b08a8f1
HFS		 1219 ift = ipv6_add_addr(idev, &addr, NULL, tmp_plen,
1220 ipv6_addr_scope(&addr), addr_flags,
1221 tmp_valid_lft, tmp_prefered_lft);
1222 if (IS_ERR(ift)) {
1da177e4
LT		 1223 in6_ifa_put(ifp);
1224 in6_dev_put(idev);
f3213831 1225 pr_info("%s: retry temporary address regeneration\n", __func__);
1da177e4 1226 tmpaddr = &addr;
53bd6749 1227 write_lock_bh(&idev->lock);
1da177e4
LT		 1228 goto retry;
1229 }
1230
1231 spin_lock_bh(&ift->lock);
1232 ift->ifpub = ifp;
76f793e3 1233 ift->cstamp = now;
1da177e4
LT		 1234 ift->tstamp = tmp_tstamp;
1235 spin_unlock_bh(&ift->lock);
1236
cf22f9a2 1237 addrconf_dad_start(ift);
1da177e4
LT		 1238 in6_ifa_put(ift);
1239 in6_dev_put(idev);
1240out:
1241 return ret;
1242}
1da177e4
LT		 1243
1244/*
072047e4 1245 * Choose an appropriate source address (RFC3484)
1da177e4 1246 */
a9b05723
YH		 1247enum {
1248 IPV6_SADDR_RULE_INIT = 0,
1249 IPV6_SADDR_RULE_LOCAL,
1250 IPV6_SADDR_RULE_SCOPE,
1251 IPV6_SADDR_RULE_PREFERRED,
1252#ifdef CONFIG_IPV6_MIP6
1253 IPV6_SADDR_RULE_HOA,
1254#endif
1255 IPV6_SADDR_RULE_OIF,
1256 IPV6_SADDR_RULE_LABEL,
a9b05723 1257 IPV6_SADDR_RULE_PRIVACY,
a9b05723
YH		 1258 IPV6_SADDR_RULE_ORCHID,
1259 IPV6_SADDR_RULE_PREFIX,
7fd2561e
EK		 1260#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1261 IPV6_SADDR_RULE_NOT_OPTIMISTIC,
1262#endif
a9b05723
YH		 1263 IPV6_SADDR_RULE_MAX
1264};
1265
072047e4 1266struct ipv6_saddr_score {
a9b05723
YH		 1267 int rule;
1268 int addr_type;
1269 struct inet6_ifaddr *ifa;
1270 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
1271 int scopedist;
1272 int matchlen;
072047e4
YH		 1273};
1274
a9b05723 1275struct ipv6_saddr_dst {
9acd9f3a 1276 const struct in6_addr *addr;
a9b05723
YH		 1277 int ifindex;
1278 int scope;
1279 int label;
7cbca67c 1280 unsigned int prefs;
a9b05723 1281};
072047e4 1282
b6f99a21 1283static inline int ipv6_saddr_preferred(int type)
1da177e4 1284{
45bb0060 1285 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
072047e4
YH		 1286 return 1;
1287 return 0;
1da177e4
LT		 1288}
1289
7fd2561e
EK		 1290static inline bool ipv6_use_optimistic_addr(struct inet6_dev *idev)
1291{
1292#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1293 return idev && idev->cnf.optimistic_dad && idev->cnf.use_optimistic;
1294#else
1295 return false;
1296#endif
1297}
1298
3de23255
BT		 1299static int ipv6_get_saddr_eval(struct net *net,
1300 struct ipv6_saddr_score *score,
a9b05723
YH		 1301 struct ipv6_saddr_dst *dst,
1302 int i)
1303{
1304 int ret;
1305
1306 if (i <= score->rule) {
1307 switch (i) {
1308 case IPV6_SADDR_RULE_SCOPE:
1309 ret = score->scopedist;
1310 break;
1311 case IPV6_SADDR_RULE_PREFIX:
1312 ret = score->matchlen;
1313 break;
1314 default:
1315 ret = !!test_bit(i, score->scorebits);
1316 }
1317 goto out;
1318 }
1319
1320 switch (i) {
1321 case IPV6_SADDR_RULE_INIT:
1322 /* Rule 0: remember if hiscore is not ready yet */
1323 ret = !!score->ifa;
1324 break;
1325 case IPV6_SADDR_RULE_LOCAL:
1326 /* Rule 1: Prefer same address */
1327 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1328 break;
1329 case IPV6_SADDR_RULE_SCOPE:
1330 /* Rule 2: Prefer appropriate scope
1331 *
1332 * ret
1333 * ^
1334 * -1 | d 15
1335 * ---+--+-+---> scope
1336 * |
1337 * | d is scope of the destination.
1338 * B-d | \
1339 * | \ <- smaller scope is better if
db9c7c39 1340 * B-15 | \ if scope is enough for destination.
a9b05723
YH		 1341 * | ret = B - scope (-1 <= scope >= d <= 15).
1342 * d-C-1 | /
1343 * |/ <- greater is better
1344 * -C / if scope is not enough for destination.
1345 * /| ret = scope - C (-1 <= d < scope <= 15).
1346 *
1347 * d - C - 1 < B -15 (for all -1 <= d <= 15).
1348 * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1349 * Assume B = 0 and we get C > 29.
1350 */
1351 ret = __ipv6_addr_src_scope(score->addr_type);
1352 if (ret >= dst->scope)
1353 ret = -ret;
1354 else
1355 ret -= 128; /* 30 is enough */
1356 score->scopedist = ret;
1357 break;
1358 case IPV6_SADDR_RULE_PREFERRED:
7fd2561e 1359 {
a9b05723 1360 /* Rule 3: Avoid deprecated and optimistic addresses */
7fd2561e
EK		 1361 u8 avoid = IFA_F_DEPRECATED;
1362
1363 if (!ipv6_use_optimistic_addr(score->ifa->idev))
1364 avoid |= IFA_F_OPTIMISTIC;
a9b05723 1365 ret = ipv6_saddr_preferred(score->addr_type) ||
7fd2561e 1366 !(score->ifa->flags & avoid);
a9b05723 1367 break;
7fd2561e 1368 }
a9b05723
YH		 1369#ifdef CONFIG_IPV6_MIP6
1370 case IPV6_SADDR_RULE_HOA:
7cbca67c 1371 {
a9b05723 1372 /* Rule 4: Prefer home address */
7cbca67c
YH		 1373 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1374 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
a9b05723 1375 break;
7cbca67c 1376 }
a9b05723
YH		 1377#endif
1378 case IPV6_SADDR_RULE_OIF:
1379 /* Rule 5: Prefer outgoing interface */
1380 ret = (!dst->ifindex ||
1381 dst->ifindex == score->ifa->idev->dev->ifindex);
1382 break;
1383 case IPV6_SADDR_RULE_LABEL:
1384 /* Rule 6: Prefer matching label */
3de23255
BT		 1385 ret = ipv6_addr_label(net,
1386 &score->ifa->addr, score->addr_type,
a9b05723
YH		 1387 score->ifa->idev->dev->ifindex) == dst->label;
1388 break;
a9b05723 1389 case IPV6_SADDR_RULE_PRIVACY:
7cbca67c 1390 {
a9b05723 1391 /* Rule 7: Prefer public address
25985edc 1392 * Note: prefer temporary address if use_tempaddr >= 2
a9b05723 1393 */
7cbca67c
YH		 1394 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1395 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1396 score->ifa->idev->cnf.use_tempaddr >= 2;
1397 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
a9b05723 1398 break;
7cbca67c 1399 }
a9b05723
YH		 1400 case IPV6_SADDR_RULE_ORCHID:
1401 /* Rule 8-: Prefer ORCHID vs ORCHID or
1402 * non-ORCHID vs non-ORCHID
1403 */
1404 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1405 ipv6_addr_orchid(dst->addr));
1406 break;
1407 case IPV6_SADDR_RULE_PREFIX:
1408 /* Rule 8: Use longest matching prefix */
91b4b04f
YH		 1409 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr);
1410 if (ret > score->ifa->prefix_len)
1411 ret = score->ifa->prefix_len;
1412 score->matchlen = ret;
a9b05723 1413 break;
7fd2561e
EK		 1414#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1415 case IPV6_SADDR_RULE_NOT_OPTIMISTIC:
1416 /* Optimistic addresses still have lower precedence than other
1417 * preferred addresses.
1418 */
1419 ret = !(score->ifa->flags & IFA_F_OPTIMISTIC);
1420 break;
1421#endif
a9b05723
YH		 1422 default:
1423 ret = 0;
1424 }
1425
1426 if (ret)
1427 __set_bit(i, score->scorebits);
1428 score->rule = i;
1429out:
1430 return ret;
1431}
1432
c0b8da1e
YH		 1433static int __ipv6_dev_get_saddr(struct net *net,
1434 struct ipv6_saddr_dst *dst,
c0b8da1e
YH		 1435 struct inet6_dev *idev,
1436 struct ipv6_saddr_score *scores,
1437 int hiscore_idx)
9131f3de 1438{
c0b8da1e 1439 struct ipv6_saddr_score *score = &scores[1 - hiscore_idx], *hiscore = &scores[hiscore_idx];
9131f3de
YH		 1440
1441 read_lock_bh(&idev->lock);
1442 list_for_each_entry(score->ifa, &idev->addr_list, if_list) {
1443 int i;
1444
1445 /*
1446 * - Tentative Address (RFC2462 section 5.4)
1447 * - A tentative address is not considered
1448 * "assigned to an interface" in the traditional
1449 * sense, unless it is also flagged as optimistic.
1450 * - Candidate Source Address (section 4)
1451 * - In any case, anycast addresses, multicast
1452 * addresses, and the unspecified address MUST
1453 * NOT be included in a candidate set.
1454 */
1455 if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1456 (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
1457 continue;
1458
1459 score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1460
1461 if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1462 score->addr_type & IPV6_ADDR_MULTICAST)) {
1463 net_dbg_ratelimited("ADDRCONF: unspecified / multicast address assigned as unicast address on %s",
1464 idev->dev->name);
1465 continue;
1466 }
1467
1468 score->rule = -1;
1469 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1470
1471 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1472 int minihiscore, miniscore;
1473
1474 minihiscore = ipv6_get_saddr_eval(net, hiscore, dst, i);
1475 miniscore = ipv6_get_saddr_eval(net, score, dst, i);
1476
1477 if (minihiscore > miniscore) {
1478 if (i == IPV6_SADDR_RULE_SCOPE &&
1479 score->scopedist > 0) {
1480 /*
1481 * special case:
1482 * each remaining entry
1483 * has too small (not enough)
1484 * scope, because ifa entries
1485 * are sorted by their scope
1486 * values.
1487 */
1488 goto out;
1489 }
1490 break;
1491 } else if (minihiscore < miniscore) {
1492 if (hiscore->ifa)
1493 in6_ifa_put(hiscore->ifa);
1494
1495 in6_ifa_hold(score->ifa);
1496
1497 swap(hiscore, score);
c0b8da1e 1498 hiscore_idx = 1 - hiscore_idx;
9131f3de
YH		 1499
1500 /* restore our iterator */
1501 score->ifa = hiscore->ifa;
1502
1503 break;
1504 }
1505 }
1506 }
1507out:
1508 read_unlock_bh(&idev->lock);
c0b8da1e 1509 return hiscore_idx;
9131f3de
YH		 1510}
1511
b3f644fc 1512int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev,
9acd9f3a 1513 const struct in6_addr *daddr, unsigned int prefs,
7cbca67c 1514 struct in6_addr *saddr)
1da177e4 1515{
c0b8da1e 1516 struct ipv6_saddr_score scores[2], *hiscore;
a9b05723 1517 struct ipv6_saddr_dst dst;
9131f3de 1518 struct inet6_dev *idev;
072047e4 1519 struct net_device *dev;
a9b05723 1520 int dst_type;
9131f3de 1521 bool use_oif_addr = false;
c0b8da1e 1522 int hiscore_idx = 0;
1da177e4 1523
a9b05723
YH		 1524 dst_type = __ipv6_addr_type(daddr);
1525 dst.addr = daddr;
1526 dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1527 dst.scope = __ipv6_addr_src_scope(dst_type);
3de23255 1528 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
7cbca67c 1529 dst.prefs = prefs;
a9b05723 1530
c0b8da1e
YH		 1531 scores[hiscore_idx].rule = -1;
1532 scores[hiscore_idx].ifa = NULL;
1da177e4 1533
8814c4b5 1534 rcu_read_lock();
1da177e4 1535
9131f3de
YH		 1536 /* Candidate Source Address (section 4)
1537 * - multicast and link-local destination address,
1538 * the set of candidate source address MUST only
1539 * include addresses assigned to interfaces
1540 * belonging to the same link as the outgoing
1541 * interface.
1542 * (- For site-local destination addresses, the
1543 * set of candidate source addresses MUST only
1544 * include addresses assigned to interfaces
1545 * belonging to the same site as the outgoing
1546 * interface.)
3985e8a3
EK		 1547 * - "It is RECOMMENDED that the candidate source addresses
1548 * be the set of unicast addresses assigned to the
1549 * interface that will be used to send to the destination
1550 * (the 'outgoing' interface)." (RFC 6724)
9131f3de
YH		 1551 */
1552 if (dst_dev) {
3985e8a3 1553 idev = __in6_dev_get(dst_dev);
9131f3de 1554 if ((dst_type & IPV6_ADDR_MULTICAST) ||
3985e8a3
EK		 1555 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL ||
1556 (idev && idev->cnf.use_oif_addrs_only)) {
9131f3de
YH		 1557 use_oif_addr = true;
1558 }
1559 }
a9b05723 1560
9131f3de 1561 if (use_oif_addr) {
c0b8da1e 1562 if (idev)
c15df306 1563 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx);
9131f3de
YH		 1564 } else {
1565 for_each_netdev_rcu(net, dev) {
1566 idev = __in6_dev_get(dev);
1567 if (!idev)
072047e4 1568 continue;
c15df306 1569 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx);
1da177e4
LT		 1570 }
1571 }
8814c4b5 1572 rcu_read_unlock();
1da177e4 1573
c0b8da1e 1574 hiscore = &scores[hiscore_idx];
a9b05723 1575 if (!hiscore->ifa)
072047e4 1576 return -EADDRNOTAVAIL;
1ab1457c 1577
4e3fd7a0 1578 *saddr = hiscore->ifa->addr;
a9b05723 1579 in6_ifa_put(hiscore->ifa);
072047e4 1580 return 0;
1da177e4 1581}
5e5f3f0f 1582EXPORT_SYMBOL(ipv6_dev_get_saddr);
1da177e4 1583
8965779d 1584int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr,
479840ff 1585 u32 banned_flags)
b7b1bfce
HFS		 1586{
1587 struct inet6_ifaddr *ifp;
1588 int err = -EADDRNOTAVAIL;
1589
602582ca
HFS		 1590 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
1591 if (ifp->scope > IFA_LINK)
1592 break;
b7b1bfce
HFS		 1593 if (ifp->scope == IFA_LINK &&
1594 !(ifp->flags & banned_flags)) {
1595 *addr = ifp->addr;
1596 err = 0;
1597 break;
1598 }
1599 }
1600 return err;
1601}
1602
95c385b4 1603int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
479840ff 1604 u32 banned_flags)
1da177e4
LT		 1605{
1606 struct inet6_dev *idev;
1607 int err = -EADDRNOTAVAIL;
1608
8814c4b5 1609 rcu_read_lock();
e21e8467
SH		 1610 idev = __in6_dev_get(dev);
1611 if (idev) {
1da177e4 1612 read_lock_bh(&idev->lock);
b7b1bfce 1613 err = __ipv6_get_lladdr(idev, addr, banned_flags);
1da177e4
LT		 1614 read_unlock_bh(&idev->lock);
1615 }
8814c4b5 1616 rcu_read_unlock();
1da177e4
LT		 1617 return err;
1618}
1619
1620static int ipv6_count_addresses(struct inet6_dev *idev)
1621{
1622 int cnt = 0;
1623 struct inet6_ifaddr *ifp;
1624
1625 read_lock_bh(&idev->lock);
502a2ffd 1626 list_for_each_entry(ifp, &idev->addr_list, if_list)
1da177e4
LT		 1627 cnt++;
1628 read_unlock_bh(&idev->lock);
1629 return cnt;
1630}
1631
b71d1d42 1632int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
2a7851bf 1633 const struct net_device *dev, int strict)
c58da4c6
EK		 1634{
1635 return ipv6_chk_addr_and_flags(net, addr, dev, strict, IFA_F_TENTATIVE);
1636}
1637EXPORT_SYMBOL(ipv6_chk_addr);
1638
1639int ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr,
1640 const struct net_device *dev, int strict,
1641 u32 banned_flags)
1da177e4 1642{
eedf042a 1643 struct inet6_ifaddr *ifp;
ddbe5032 1644 unsigned int hash = inet6_addr_hash(addr);
c58da4c6 1645 u32 ifp_flags;
1da177e4 1646
5c578aed 1647 rcu_read_lock_bh();
b67bfe0d 1648 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
878628fb 1649 if (!net_eq(dev_net(ifp->idev->dev), net))
bfeade08 1650 continue;
c58da4c6
EK		 1651 /* Decouple optimistic from tentative for evaluation here.
1652 * Ban optimistic addresses explicitly, when required.
1653 */
1654 ifp_flags = (ifp->flags&IFA_F_OPTIMISTIC)
1655 ? (ifp->flags&~IFA_F_TENTATIVE)
1656 : ifp->flags;
1da177e4 1657 if (ipv6_addr_equal(&ifp->addr, addr) &&
c58da4c6 1658 !(ifp_flags&banned_flags) &&
63159f29 1659 (!dev || ifp->idev->dev == dev ||
eedf042a
SH		 1660 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) {
1661 rcu_read_unlock_bh();
1662 return 1;
1da177e4
LT		 1663 }
1664 }
5c578aed 1665
eedf042a
SH		 1666 rcu_read_unlock_bh();
1667 return 0;
1da177e4 1668}
c58da4c6 1669EXPORT_SYMBOL(ipv6_chk_addr_and_flags);
7159039a 1670
3e81c6da
DM		 1671static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1672 struct net_device *dev)
1da177e4 1673{
ddbe5032 1674 unsigned int hash = inet6_addr_hash(addr);
c2e21293 1675 struct inet6_ifaddr *ifp;
1da177e4 1676
b67bfe0d 1677 hlist_for_each_entry(ifp, &inet6_addr_lst[hash], addr_lst) {
878628fb 1678 if (!net_eq(dev_net(ifp->idev->dev), net))
06bfe655 1679 continue;
1da177e4 1680 if (ipv6_addr_equal(&ifp->addr, addr)) {
63159f29 1681 if (!dev || ifp->idev->dev == dev)
3e81c6da 1682 return true;
1da177e4
LT		 1683 }
1684 }
3e81c6da 1685 return false;
1da177e4
LT		 1686}
1687
7df37ff3
CB		 1688/* Compares an address/prefix_len with addresses on device @dev.
1689 * If one is found it returns true.
1690 */
1691bool ipv6_chk_custom_prefix(const struct in6_addr *addr,
1692 const unsigned int prefix_len, struct net_device *dev)
1693{
1694 struct inet6_dev *idev;
1695 struct inet6_ifaddr *ifa;
1696 bool ret = false;
1697
1698 rcu_read_lock();
1699 idev = __in6_dev_get(dev);
1700 if (idev) {
1701 read_lock_bh(&idev->lock);
1702 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1703 ret = ipv6_prefix_equal(addr, &ifa->addr, prefix_len);
1704 if (ret)
1705 break;
1706 }
1707 read_unlock_bh(&idev->lock);
1708 }
1709 rcu_read_unlock();
1710
1711 return ret;
1712}
1713EXPORT_SYMBOL(ipv6_chk_custom_prefix);
1714
b71d1d42 1715int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev)
52eeeb84
YH		 1716{
1717 struct inet6_dev *idev;
1718 struct inet6_ifaddr *ifa;
1719 int onlink;
1720
1721 onlink = 0;
1722 rcu_read_lock();
1723 idev = __in6_dev_get(dev);
1724 if (idev) {
1725 read_lock_bh(&idev->lock);
502a2ffd 1726 list_for_each_entry(ifa, &idev->addr_list, if_list) {
52eeeb84
YH		 1727 onlink = ipv6_prefix_equal(addr, &ifa->addr,
1728 ifa->prefix_len);
1729 if (onlink)
1730 break;
1731 }
1732 read_unlock_bh(&idev->lock);
1733 }
1734 rcu_read_unlock();
1735 return onlink;
1736}
52eeeb84
YH		 1737EXPORT_SYMBOL(ipv6_chk_prefix);
1738
9acd9f3a 1739struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1cab3da6 1740 struct net_device *dev, int strict)
1da177e4 1741{
b79d1d54 1742 struct inet6_ifaddr *ifp, *result = NULL;
ddbe5032 1743 unsigned int hash = inet6_addr_hash(addr);
1da177e4 1744
5c578aed 1745 rcu_read_lock_bh();
b67bfe0d 1746 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
878628fb 1747 if (!net_eq(dev_net(ifp->idev->dev), net))
1cab3da6 1748 continue;
1da177e4 1749 if (ipv6_addr_equal(&ifp->addr, addr)) {
63159f29 1750 if (!dev || ifp->idev->dev == dev ||
1da177e4 1751 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
b79d1d54 1752 result = ifp;
1da177e4
LT		 1753 in6_ifa_hold(ifp);
1754 break;
1755 }
1756 }
1757 }
5c578aed 1758 rcu_read_unlock_bh();
1da177e4 1759
b79d1d54 1760 return result;
1da177e4
LT		 1761}
1762
1da177e4
LT		 1763/* Gets referenced address, destroys ifaddr */
1764
cc411d0b 1765static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
1da177e4 1766{
1da177e4
LT		 1767 if (ifp->flags&IFA_F_PERMANENT) {
1768 spin_lock_bh(&ifp->lock);
c15b1cca 1769 addrconf_del_dad_work(ifp);
1da177e4 1770 ifp->flags |= IFA_F_TENTATIVE;
cc411d0b
BH		 1771 if (dad_failed)
1772 ifp->flags |= IFA_F_DADFAILED;
1da177e4 1773 spin_unlock_bh(&ifp->lock);
e2577a06
HX		 1774 if (dad_failed)
1775 ipv6_ifa_notify(0, ifp);
1da177e4 1776 in6_ifa_put(ifp);
1da177e4
LT		 1777 } else if (ifp->flags&IFA_F_TEMPORARY) {
1778 struct inet6_ifaddr *ifpub;
1779 spin_lock_bh(&ifp->lock);
1780 ifpub = ifp->ifpub;
1781 if (ifpub) {
1782 in6_ifa_hold(ifpub);
1783 spin_unlock_bh(&ifp->lock);
1784 ipv6_create_tempaddr(ifpub, ifp);
1785 in6_ifa_put(ifpub);
1786 } else {
1787 spin_unlock_bh(&ifp->lock);
1788 }
1789 ipv6_del_addr(ifp);
c15b1cca 1790 } else {
1da177e4 1791 ipv6_del_addr(ifp);
c15b1cca 1792 }
1da177e4
LT		 1793}
1794
f2344a13
HX		 1795static int addrconf_dad_end(struct inet6_ifaddr *ifp)
1796{
1797 int err = -ENOENT;
1798
8e8e676d 1799 spin_lock_bh(&ifp->lock);
f2344a13
HX		 1800 if (ifp->state == INET6_IFADDR_STATE_DAD) {
1801 ifp->state = INET6_IFADDR_STATE_POSTDAD;
1802 err = 0;
1803 }
8e8e676d 1804 spin_unlock_bh(&ifp->lock);
f2344a13
HX		 1805
1806 return err;
1807}
1808
3c21edbd
YH		 1809void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1810{
5f40ef77 1811 struct in6_addr addr;
1b34be74 1812 struct inet6_dev *idev = ifp->idev;
1855b7c3 1813 struct net *net = dev_net(ifp->idev->dev);
9bdd8d40 1814
853dc2e0
UB		 1815 if (addrconf_dad_end(ifp)) {
1816 in6_ifa_put(ifp);
f2344a13 1817 return;
853dc2e0 1818 }
f2344a13 1819
e87cc472
JP		 1820 net_info_ratelimited("%s: IPv6 duplicate address %pI6c detected!\n",
1821 ifp->idev->dev->name, &ifp->addr);
9bdd8d40 1822
5f40ef77
HFS		 1823 spin_lock_bh(&ifp->lock);
1824
1825 if (ifp->flags & IFA_F_STABLE_PRIVACY) {
1826 int scope = ifp->scope;
1827 u32 flags = ifp->flags;
1828 struct in6_addr new_addr;
1829 struct inet6_ifaddr *ifp2;
1830 u32 valid_lft, preferred_lft;
1831 int pfxlen = ifp->prefix_len;
5f40ef77
HFS		 1832 int retries = ifp->stable_privacy_retry + 1;
1833
1855b7c3 1834 if (retries > net->ipv6.sysctl.idgen_retries) {
5f40ef77
HFS		 1835 net_info_ratelimited("%s: privacy stable address generation failed because of DAD conflicts!\n",
1836 ifp->idev->dev->name);
1837 goto errdad;
1838 }
1839
1840 new_addr = ifp->addr;
1841 if (ipv6_generate_stable_address(&new_addr, retries,
1842 idev))
1843 goto errdad;
1844
1845 valid_lft = ifp->valid_lft;
1846 preferred_lft = ifp->prefered_lft;
1847
1848 spin_unlock_bh(&ifp->lock);
1b34be74 1849
5f40ef77
HFS		 1850 if (idev->cnf.max_addresses &&
1851 ipv6_count_addresses(idev) >=
1852 idev->cnf.max_addresses)
1853 goto lock_errdad;
1854
1855 net_info_ratelimited("%s: generating new stable privacy address because of DAD conflict\n",
1856 ifp->idev->dev->name);
1857
1858 ifp2 = ipv6_add_addr(idev, &new_addr, NULL, pfxlen,
1859 scope, flags, valid_lft,
1860 preferred_lft);
1861 if (IS_ERR(ifp2))
1862 goto lock_errdad;
1863
1864 spin_lock_bh(&ifp2->lock);
1865 ifp2->stable_privacy_retry = retries;
1866 ifp2->state = INET6_IFADDR_STATE_PREDAD;
1867 spin_unlock_bh(&ifp2->lock);
1868
1855b7c3 1869 addrconf_mod_dad_work(ifp2, net->ipv6.sysctl.idgen_delay);
5f40ef77
HFS		 1870 in6_ifa_put(ifp2);
1871lock_errdad:
1872 spin_lock_bh(&ifp->lock);
1873 } else if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6) {
1b34be74
YH		 1874 addr.s6_addr32[0] = htonl(0xfe800000);
1875 addr.s6_addr32[1] = 0;
1876
1877 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
1878 ipv6_addr_equal(&ifp->addr, &addr)) {
1879 /* DAD failed for link-local based on MAC address */
1880 idev->cnf.disable_ipv6 = 1;
9bdd8d40 1881
f3213831 1882 pr_info("%s: IPv6 being disabled!\n",
9bdd8d40 1883 ifp->idev->dev->name);
1b34be74
YH		 1884 }
1885 }
1886
5f40ef77 1887errdad:
c15b1cca
HFS		 1888 /* transition from _POSTDAD to _ERRDAD */
1889 ifp->state = INET6_IFADDR_STATE_ERRDAD;
8e8e676d 1890 spin_unlock_bh(&ifp->lock);
c15b1cca
HFS		 1891
1892 addrconf_mod_dad_work(ifp, 0);
3c21edbd 1893}
1da177e4 1894
a9ed4a29
SD		 1895/* Join to solicited addr multicast group.
1896 * caller must hold RTNL */
b71d1d42 1897void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr)
1da177e4
LT		 1898{
1899 struct in6_addr maddr;
1900
1901 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1902 return;
1903
1904 addrconf_addr_solict_mult(addr, &maddr);
1905 ipv6_dev_mc_inc(dev, &maddr);
1906}
1907
a9ed4a29 1908/* caller must hold RTNL */
b71d1d42 1909void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr)
1da177e4
LT		 1910{
1911 struct in6_addr maddr;
1912
1913 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1914 return;
1915
1916 addrconf_addr_solict_mult(addr, &maddr);
1917 __ipv6_dev_mc_dec(idev, &maddr);
1918}
1919
a9ed4a29 1920/* caller must hold RTNL */
20380731 1921static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1da177e4
LT		 1922{
1923 struct in6_addr addr;
c15b1cca 1924
88ad3149 1925 if (ifp->prefix_len >= 127) /* RFC 6164 */
2bda8a0c 1926 return;
1da177e4
LT		 1927 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1928 if (ipv6_addr_any(&addr))
1929 return;
013b4d90 1930 __ipv6_dev_ac_inc(ifp->idev, &addr);
1da177e4
LT		 1931}
1932
a9ed4a29 1933/* caller must hold RTNL */
20380731 1934static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1da177e4
LT		 1935{
1936 struct in6_addr addr;
c15b1cca 1937
88ad3149 1938 if (ifp->prefix_len >= 127) /* RFC 6164 */
32019e65 1939 return;
1da177e4
LT		 1940 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1941 if (ipv6_addr_any(&addr))
1942 return;
1943 __ipv6_dev_ac_dec(ifp->idev, &addr);
1944}
1945
073a8e0e
YH		 1946static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
1947{
1948 if (dev->addr_len != ETH_ALEN)
1949 return -1;
1950 memcpy(eui, dev->dev_addr, 3);
1951 memcpy(eui + 5, dev->dev_addr + 3, 3);
1952
1953 /*
1954 * The zSeries OSA network cards can be shared among various
1955 * OS instances, but the OSA cards have only one MAC address.
1956 * This leads to duplicate address conflicts in conjunction
1957 * with IPv6 if more than one instance uses the same card.
1958 *
1959 * The driver for these cards can deliver a unique 16-bit
1960 * identifier for each instance sharing the same card. It is
1961 * placed instead of 0xFFFE in the interface identifier. The
1962 * "u" bit of the interface identifier is not inverted in this
1963 * case. Hence the resulting interface identifier has local
1964 * scope according to RFC2373.
1965 */
1966 if (dev->dev_id) {
1967 eui[3] = (dev->dev_id >> 8) & 0xFF;
1968 eui[4] = dev->dev_id & 0xFF;
1969 } else {
1970 eui[3] = 0xFF;
1971 eui[4] = 0xFE;
1972 eui[0] ^= 2;
1973 }
1974 return 0;
1975}
1976
06a4c1c5 1977static int addrconf_ifid_eui64(u8 *eui, struct net_device *dev)
1978{
1979 if (dev->addr_len != IEEE802154_ADDR_LEN)
1980 return -1;
1981 memcpy(eui, dev->dev_addr, 8);
5e98a36e 1982 eui[0] ^= 2;
06a4c1c5 1983 return 0;
1984}
1985
cb6bf355
YH		 1986static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev)
1987{
1988 union fwnet_hwaddr *ha;
1989
1990 if (dev->addr_len != FWNET_ALEN)
1991 return -1;
1992
1993 ha = (union fwnet_hwaddr *)dev->dev_addr;
1994
1995 memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id));
1996 eui[0] ^= 2;
1997 return 0;
1998}
1999
073a8e0e
YH		 2000static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
2001{
2002 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
2003 if (dev->addr_len != ARCNET_ALEN)
2004 return -1;
2005 memset(eui, 0, 7);
8e5e8f30 2006 eui[7] = *(u8 *)dev->dev_addr;
073a8e0e
YH		 2007 return 0;
2008}
2009
2010static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
2011{
2012 if (dev->addr_len != INFINIBAND_ALEN)
2013 return -1;
2014 memcpy(eui, dev->dev_addr + 12, 8);
2015 eui[0] |= 2;
2016 return 0;
2017}
2018
c61393ea 2019static int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
dfd982ba 2020{
9af28511
SH		 2021 if (addr == 0)
2022 return -1;
dfd982ba
YH		 2023 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
2024 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
2025 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
2026 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
2027 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
2028 ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
2029 eui[1] = 0;
2030 eui[2] = 0x5E;
2031 eui[3] = 0xFE;
2032 memcpy(eui + 4, &addr, 4);
2033 return 0;
2034}
dfd982ba
YH		 2035
2036static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
2037{
2038 if (dev->priv_flags & IFF_ISATAP)
2039 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
2040 return -1;
2041}
2042
aee80b54 2043static int addrconf_ifid_gre(u8 *eui, struct net_device *dev)
2044{
2045 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
2046}
2047
e837735e
ND		 2048static int addrconf_ifid_ip6tnl(u8 *eui, struct net_device *dev)
2049{
2050 memcpy(eui, dev->perm_addr, 3);
2051 memcpy(eui + 5, dev->perm_addr + 3, 3);
2052 eui[3] = 0xFF;
2053 eui[4] = 0xFE;
2054 eui[0] ^= 2;
2055 return 0;
2056}
2057
1da177e4
LT		 2058static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
2059{
2060 switch (dev->type) {
2061 case ARPHRD_ETHER:
2062 case ARPHRD_FDDI:
073a8e0e 2063 return addrconf_ifid_eui48(eui, dev);
1da177e4 2064 case ARPHRD_ARCNET:
073a8e0e 2065 return addrconf_ifid_arcnet(eui, dev);
1da177e4 2066 case ARPHRD_INFINIBAND:
073a8e0e 2067 return addrconf_ifid_infiniband(eui, dev);
c7dc89c0 2068 case ARPHRD_SIT:
dfd982ba 2069 return addrconf_ifid_sit(eui, dev);
aee80b54 2070 case ARPHRD_IPGRE:
2071 return addrconf_ifid_gre(eui, dev);
e74bccb8 2072 case ARPHRD_6LOWPAN:
06a4c1c5 2073 case ARPHRD_IEEE802154:
2074 return addrconf_ifid_eui64(eui, dev);
cb6bf355
YH		 2075 case ARPHRD_IEEE1394:
2076 return addrconf_ifid_ieee1394(eui, dev);
e837735e
ND		 2077 case ARPHRD_TUNNEL6:
2078 return addrconf_ifid_ip6tnl(eui, dev);
1da177e4
LT		 2079 }
2080 return -1;
2081}
2082
2083static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
2084{
2085 int err = -1;
2086 struct inet6_ifaddr *ifp;
2087
2088 read_lock_bh(&idev->lock);
602582ca
HFS		 2089 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
2090 if (ifp->scope > IFA_LINK)
2091 break;
1da177e4
LT		 2092 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
2093 memcpy(eui, ifp->addr.s6_addr+8, 8);
2094 err = 0;
2095 break;
2096 }
2097 }
2098 read_unlock_bh(&idev->lock);
2099 return err;
2100}
2101
1da177e4 2102/* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
eb7e0575 2103static void __ipv6_regen_rndid(struct inet6_dev *idev)
1da177e4 2104{
1da177e4 2105regen:
955189ef 2106 get_random_bytes(idev->rndid, sizeof(idev->rndid));
1da177e4 2107 idev->rndid[0] &= ~0x02;
1da177e4
LT		 2108
2109 /*
2110 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
2111 * check if generated address is not inappropriate
2112 *
2113 * - Reserved subnet anycast (RFC 2526)
2114 * 11111101 11....11 1xxxxxxx
c7dc89c0 2115 * - ISATAP (RFC4214) 6.1
1da177e4
LT		 2116 * 00-00-5E-FE-xx-xx-xx-xx
2117 * - value 0
2118 * - XXX: already assigned to an address on the device
2119 */
1ab1457c 2120 if (idev->rndid[0] == 0xfd &&
1da177e4
LT		 2121 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
2122 (idev->rndid[7]&0x80))
2123 goto regen;
2124 if ((idev->rndid[0]|idev->rndid[1]) == 0) {
2125 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
2126 goto regen;
2127 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
2128 goto regen;
2129 }
1da177e4
LT		 2130}
2131
2132static void ipv6_regen_rndid(unsigned long data)
2133{
2134 struct inet6_dev *idev = (struct inet6_dev *) data;
2135 unsigned long expires;
2136
8814c4b5 2137 rcu_read_lock_bh();
1da177e4
LT		 2138 write_lock_bh(&idev->lock);
2139
2140 if (idev->dead)
2141 goto out;
2142
eb7e0575 2143 __ipv6_regen_rndid(idev);
1ab1457c 2144
1da177e4 2145 expires = jiffies +
1ab1457c 2146 idev->cnf.temp_prefered_lft * HZ -
1f9248e5
JP		 2147 idev->cnf.regen_max_retry * idev->cnf.dad_transmits *
2148 NEIGH_VAR(idev->nd_parms, RETRANS_TIME) -
784e2710 2149 idev->cnf.max_desync_factor * HZ;
1da177e4 2150 if (time_before(expires, jiffies)) {
f3213831
JP		 2151 pr_warn("%s: too short regeneration interval; timer disabled for %s\n",
2152 __func__, idev->dev->name);
1da177e4
LT		 2153 goto out;
2154 }
2155
2156 if (!mod_timer(&idev->regen_timer, expires))
2157 in6_dev_hold(idev);
2158
2159out:
2160 write_unlock_bh(&idev->lock);
8814c4b5 2161 rcu_read_unlock_bh();
1da177e4
LT		 2162 in6_dev_put(idev);
2163}
2164
eb7e0575 2165static void __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr)
8e5e8f30 2166{
1da177e4 2167 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
eb7e0575 2168 __ipv6_regen_rndid(idev);
1da177e4 2169}
1da177e4
LT		 2170
2171/*
2172 * Add prefix route.
2173 */
2174
2175static void
2176addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
e431b8c0 2177 unsigned long expires, u32 flags)
1da177e4 2178{
86872cb5
TG		 2179 struct fib6_config cfg = {
2180 .fc_table = RT6_TABLE_PREFIX,
2181 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2182 .fc_ifindex = dev->ifindex,
2183 .fc_expires = expires,
2184 .fc_dst_len = plen,
2185 .fc_flags = RTF_UP | flags,
c346dca1 2186 .fc_nlinfo.nl_net = dev_net(dev),
f410a1fb 2187 .fc_protocol = RTPROT_KERNEL,
86872cb5 2188 };
1da177e4 2189
4e3fd7a0 2190 cfg.fc_dst = *pfx;
1da177e4
LT		 2191
2192 /* Prevent useless cloning on PtP SIT.
2193 This thing is done here expecting that the whole
2194 class of non-broadcast devices need not cloning.
2195 */
07a93626 2196#if IS_ENABLED(CONFIG_IPV6_SIT)
86872cb5
TG		 2197 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
2198 cfg.fc_flags |= RTF_NONEXTHOP;
0be669bb 2199#endif
1da177e4 2200
86872cb5 2201 ip6_route_add(&cfg);
1da177e4
LT		 2202}
2203
14ef37b6
AH		 2204
2205static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
2206 int plen,
2207 const struct net_device *dev,
2208 u32 flags, u32 noflags)
2209{
2210 struct fib6_node *fn;
2211 struct rt6_info *rt = NULL;
2212 struct fib6_table *table;
2213
2214 table = fib6_get_table(dev_net(dev), RT6_TABLE_PREFIX);
63159f29 2215 if (!table)
14ef37b6
AH		 2216 return NULL;
2217
5744dd9b 2218 read_lock_bh(&table->tb6_lock);
14ef37b6
AH		 2219 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0);
2220 if (!fn)
2221 goto out;
1f56a01f
MKL		 2222
2223 noflags |= RTF_CACHE;
14ef37b6 2224 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
d1918542 2225 if (rt->dst.dev->ifindex != dev->ifindex)
14ef37b6
AH		 2226 continue;
2227 if ((rt->rt6i_flags & flags) != flags)
2228 continue;
85da53bf 2229 if ((rt->rt6i_flags & noflags) != 0)
14ef37b6
AH		 2230 continue;
2231 dst_hold(&rt->dst);
2232 break;
2233 }
2234out:
5744dd9b 2235 read_unlock_bh(&table->tb6_lock);
14ef37b6
AH		 2236 return rt;
2237}
2238
2239
1da177e4
LT		 2240/* Create "default" multicast route to the interface */
2241
2242static void addrconf_add_mroute(struct net_device *dev)
2243{
86872cb5
TG		 2244 struct fib6_config cfg = {
2245 .fc_table = RT6_TABLE_LOCAL,
2246 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2247 .fc_ifindex = dev->ifindex,
2248 .fc_dst_len = 8,
2249 .fc_flags = RTF_UP,
c346dca1 2250 .fc_nlinfo.nl_net = dev_net(dev),
86872cb5
TG		 2251 };
2252
2253 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
2254
2255 ip6_route_add(&cfg);
1da177e4
LT		 2256}
2257
1da177e4
LT		 2258static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
2259{
2260 struct inet6_dev *idev;
2261
2262 ASSERT_RTNL();
2263
e21e8467
SH		 2264 idev = ipv6_find_idev(dev);
2265 if (!idev)
64e724f6
BH		 2266 return ERR_PTR(-ENOBUFS);
2267
2268 if (idev->cnf.disable_ipv6)
2269 return ERR_PTR(-EACCES);
1da177e4
LT		 2270
2271 /* Add default multicast route */
4af04aba
LW		 2272 if (!(dev->flags & IFF_LOOPBACK))
2273 addrconf_add_mroute(dev);
1da177e4 2274
1da177e4
LT		 2275 return idev;
2276}
2277
53bd6749
JP		 2278static void manage_tempaddrs(struct inet6_dev *idev,
2279 struct inet6_ifaddr *ifp,
2280 __u32 valid_lft, __u32 prefered_lft,
2281 bool create, unsigned long now)
2282{
2283 u32 flags;
2284 struct inet6_ifaddr *ift;
2285
2286 read_lock_bh(&idev->lock);
2287 /* update all temporary addresses in the list */
2288 list_for_each_entry(ift, &idev->tempaddr_list, tmp_list) {
2289 int age, max_valid, max_prefered;
2290
2291 if (ifp != ift->ifpub)
2292 continue;
2293
2294 /* RFC 4941 section 3.3:
2295 * If a received option will extend the lifetime of a public
2296 * address, the lifetimes of temporary addresses should
2297 * be extended, subject to the overall constraint that no
2298 * temporary addresses should ever remain "valid" or "preferred"
2299 * for a time longer than (TEMP_VALID_LIFETIME) or
2300 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), respectively.
2301 */
2302 age = (now - ift->cstamp) / HZ;
2303 max_valid = idev->cnf.temp_valid_lft - age;
2304 if (max_valid < 0)
2305 max_valid = 0;
2306
2307 max_prefered = idev->cnf.temp_prefered_lft -
2308 idev->cnf.max_desync_factor - age;
2309 if (max_prefered < 0)
2310 max_prefered = 0;
2311
2312 if (valid_lft > max_valid)
2313 valid_lft = max_valid;
2314
2315 if (prefered_lft > max_prefered)
2316 prefered_lft = max_prefered;
2317
2318 spin_lock(&ift->lock);
2319 flags = ift->flags;
2320 ift->valid_lft = valid_lft;
2321 ift->prefered_lft = prefered_lft;
2322 ift->tstamp = now;
2323 if (prefered_lft > 0)
2324 ift->flags &= ~IFA_F_DEPRECATED;
2325
2326 spin_unlock(&ift->lock);
2327 if (!(flags&IFA_F_TENTATIVE))
2328 ipv6_ifa_notify(0, ift);
2329 }
2330
2331 if ((create || list_empty(&idev->tempaddr_list)) &&
2332 idev->cnf.use_tempaddr > 0) {
2333 /* When a new public address is created as described
2334 * in [ADDRCONF], also create a new temporary address.
2335 * Also create a temporary address if it's enabled but
2336 * no temporary address currently exists.
2337 */
2338 read_unlock_bh(&idev->lock);
2339 ipv6_create_tempaddr(ifp, NULL);
2340 } else {
2341 read_unlock_bh(&idev->lock);
2342 }
2343}
2344
e6bff995 2345void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao)
1da177e4
LT		 2346{
2347 struct prefix_info *pinfo;
2348 __u32 valid_lft;
2349 __u32 prefered_lft;
2350 int addr_type;
64236f3f 2351 u32 addr_flags = 0;
1da177e4 2352 struct inet6_dev *in6_dev;
56d417b1 2353 struct net *net = dev_net(dev);
1da177e4
LT		 2354
2355 pinfo = (struct prefix_info *) opt;
1ab1457c 2356
1da177e4 2357 if (len < sizeof(struct prefix_info)) {
ba3542e1 2358 ADBG("addrconf: prefix option too short\n");
1da177e4
LT		 2359 return;
2360 }
1ab1457c 2361
1da177e4
LT		 2362 /*
2363 * Validation checks ([ADDRCONF], page 19)
2364 */
2365
2366 addr_type = ipv6_addr_type(&pinfo->prefix);
2367
2368 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
2369 return;
2370
2371 valid_lft = ntohl(pinfo->valid);
2372 prefered_lft = ntohl(pinfo->prefered);
2373
2374 if (prefered_lft > valid_lft) {
e87cc472 2375 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n");
1da177e4
LT		 2376 return;
2377 }
2378
2379 in6_dev = in6_dev_get(dev);
2380
63159f29 2381 if (!in6_dev) {
e87cc472
JP		 2382 net_dbg_ratelimited("addrconf: device %s not configured\n",
2383 dev->name);
1da177e4
LT		 2384 return;
2385 }
2386
2387 /*
2388 * Two things going on here:
2389 * 1) Add routes for on-link prefixes
2390 * 2) Configure prefixes with the auto flag set
2391 */
2392
4bed72e4
YH		 2393 if (pinfo->onlink) {
2394 struct rt6_info *rt;
2395 unsigned long rt_expires;
2396
6f704992
YH		 2397 /* Avoid arithmetic overflow. Really, we could
2398 * save rt_expires in seconds, likely valid_lft,
2399 * but it would require division in fib gc, that it
2400 * not good.
2401 */
4bed72e4
YH		 2402 if (HZ > USER_HZ)
2403 rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
2404 else
2405 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
3dd4bc68 2406
4bed72e4
YH		 2407 if (addrconf_finite_timeout(rt_expires))
2408 rt_expires *= HZ;
1da177e4 2409
14ef37b6
AH		 2410 rt = addrconf_get_prefix_route(&pinfo->prefix,
2411 pinfo->prefix_len,
2412 dev,
2413 RTF_ADDRCONF | RTF_PREFIX_RT,
2414 RTF_GATEWAY | RTF_DEFAULT);
1da177e4 2415
14ef37b6 2416 if (rt) {
6f704992
YH		 2417 /* Autoconf prefix route */
2418 if (valid_lft == 0) {
2419 ip6_del_rt(rt);
2420 rt = NULL;
4bed72e4 2421 } else if (addrconf_finite_timeout(rt_expires)) {
6f704992 2422 /* not infinity */
1716a961 2423 rt6_set_expires(rt, jiffies + rt_expires);
6f704992 2424 } else {
1716a961 2425 rt6_clean_expires(rt);
1da177e4
LT		 2426 }
2427 } else if (valid_lft) {
6f704992 2428 clock_t expires = 0;
4bed72e4
YH		 2429 int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
2430 if (addrconf_finite_timeout(rt_expires)) {
6f704992
YH		 2431 /* not infinity */
2432 flags |= RTF_EXPIRES;
2433 expires = jiffies_to_clock_t(rt_expires);
2434 }
1da177e4 2435 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
6f704992 2436 dev, expires, flags);
1da177e4 2437 }
94e187c0 2438 ip6_rt_put(rt);
1da177e4
LT		 2439 }
2440
2441 /* Try to figure out our local address for this prefix */
2442
2443 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
8e5e8f30 2444 struct inet6_ifaddr *ifp;
1da177e4
LT		 2445 struct in6_addr addr;
2446 int create = 0, update_lft = 0;
617fe29d 2447 bool tokenized = false;
1da177e4
LT		 2448
2449 if (pinfo->prefix_len == 64) {
2450 memcpy(&addr, &pinfo->prefix, 8);
f53adae4
DB		 2451
2452 if (!ipv6_addr_any(&in6_dev->token)) {
2453 read_lock_bh(&in6_dev->lock);
2454 memcpy(addr.s6_addr + 8,
2455 in6_dev->token.s6_addr + 8, 8);
2456 read_unlock_bh(&in6_dev->lock);
617fe29d 2457 tokenized = true;
622c81d5
HFS		 2458 } else if (in6_dev->addr_gen_mode ==
2459 IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
2460 !ipv6_generate_stable_address(&addr, 0,
2461 in6_dev)) {
64236f3f 2462 addr_flags |= IFA_F_STABLE_PRIVACY;
622c81d5 2463 goto ok;
f53adae4
DB		 2464 } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
2465 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
1da177e4
LT		 2466 in6_dev_put(in6_dev);
2467 return;
2468 }
2469 goto ok;
2470 }
e87cc472
JP		 2471 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n",
2472 pinfo->prefix_len);
1da177e4
LT		 2473 in6_dev_put(in6_dev);
2474 return;
2475
2476ok:
2477
53b7997f 2478 ifp = ipv6_get_ifaddr(net, &addr, dev, 1);
1da177e4 2479
63159f29 2480 if (!ifp && valid_lft) {
1da177e4 2481 int max_addresses = in6_dev->cnf.max_addresses;
95c385b4
NH		 2482
2483#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2484 if (in6_dev->cnf.optimistic_dad &&
e6bff995 2485 !net->ipv6.devconf_all->forwarding && sllao)
95c385b4
NH		 2486 addr_flags = IFA_F_OPTIMISTIC;
2487#endif
1da177e4
LT		 2488
2489 /* Do not allow to create too much of autoconfigured
2490 * addresses; this would be too easy way to crash kernel.
2491 */
2492 if (!max_addresses ||
2493 ipv6_count_addresses(in6_dev) < max_addresses)
3f8f5298
JP		 2494 ifp = ipv6_add_addr(in6_dev, &addr, NULL,
2495 pinfo->prefix_len,
95c385b4 2496 addr_type&IPV6_ADDR_SCOPE_MASK,
8a226b2c
JB		 2497 addr_flags, valid_lft,
2498 prefered_lft);
1da177e4 2499
3f0d2ba0 2500 if (IS_ERR_OR_NULL(ifp)) {
1da177e4
LT		 2501 in6_dev_put(in6_dev);
2502 return;
2503 }
2504
8a226b2c
JB		 2505 update_lft = 0;
2506 create = 1;
c15b1cca
HFS		 2507 spin_lock_bh(&ifp->lock);
2508 ifp->flags |= IFA_F_MANAGETEMPADDR;
1da177e4 2509 ifp->cstamp = jiffies;
617fe29d 2510 ifp->tokenized = tokenized;
c15b1cca 2511 spin_unlock_bh(&ifp->lock);
cf22f9a2 2512 addrconf_dad_start(ifp);
1da177e4
LT		 2513 }
2514
2515 if (ifp) {
479840ff 2516 u32 flags;
1da177e4 2517 unsigned long now;
1da177e4
LT		 2518 u32 stored_lft;
2519
2520 /* update lifetime (RFC2462 5.5.3 e) */
8e8e676d 2521 spin_lock_bh(&ifp->lock);
1da177e4
LT		 2522 now = jiffies;
2523 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
2524 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
2525 else
2526 stored_lft = 0;
8a226b2c 2527 if (!update_lft && !create && stored_lft) {
9451a304
FF		 2528 const u32 minimum_lft = min_t(u32,
2529 stored_lft, MIN_VALID_LIFETIME);
c9d55d5b
PM		 2530 valid_lft = max(valid_lft, minimum_lft);
2531
2532 /* RFC4862 Section 5.5.3e:
2533 * "Note that the preferred lifetime of the
2534 * corresponding address is always reset to
2535 * the Preferred Lifetime in the received
2536 * Prefix Information option, regardless of
2537 * whether the valid lifetime is also reset or
2538 * ignored."
2539 *
2540 * So we should always update prefered_lft here.
2541 */
2542 update_lft = 1;
1da177e4
LT		 2543 }
2544
2545 if (update_lft) {
2546 ifp->valid_lft = valid_lft;
2547 ifp->prefered_lft = prefered_lft;
2548 ifp->tstamp = now;
2549 flags = ifp->flags;
2550 ifp->flags &= ~IFA_F_DEPRECATED;
8e8e676d 2551 spin_unlock_bh(&ifp->lock);
1da177e4
LT		 2552
2553 if (!(flags&IFA_F_TENTATIVE))
2554 ipv6_ifa_notify(0, ifp);
2555 } else
8e8e676d 2556 spin_unlock_bh(&ifp->lock);
1da177e4 2557
53bd6749
JP		 2558 manage_tempaddrs(in6_dev, ifp, valid_lft, prefered_lft,
2559 create, now);
5d9efa7e 2560
1da177e4 2561 in6_ifa_put(ifp);
c15b1cca 2562 addrconf_verify();
1da177e4
LT		 2563 }
2564 }
2565 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
2566 in6_dev_put(in6_dev);
2567}
2568
2569/*
2570 * Set destination address.
2571 * Special case for SIT interfaces where we create a new "virtual"
2572 * device.
2573 */
af284937 2574int addrconf_set_dstaddr(struct net *net, void __user *arg)
1da177e4
LT		 2575{
2576 struct in6_ifreq ireq;
2577 struct net_device *dev;
2578 int err = -EINVAL;
2579
2580 rtnl_lock();
2581
2582 err = -EFAULT;
2583 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2584 goto err_exit;
2585
af284937 2586 dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
1da177e4
LT		 2587
2588 err = -ENODEV;
63159f29 2589 if (!dev)
1da177e4
LT		 2590 goto err_exit;
2591
07a93626 2592#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4 2593 if (dev->type == ARPHRD_SIT) {
5bc3eb7e 2594 const struct net_device_ops *ops = dev->netdev_ops;
1da177e4 2595 struct ifreq ifr;
1da177e4
LT		 2596 struct ip_tunnel_parm p;
2597
2598 err = -EADDRNOTAVAIL;
2599 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2600 goto err_exit;
2601
2602 memset(&p, 0, sizeof(p));
2603 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2604 p.iph.saddr = 0;
2605 p.iph.version = 4;
2606 p.iph.ihl = 5;
2607 p.iph.protocol = IPPROTO_IPV6;
2608 p.iph.ttl = 64;
d20b3109 2609 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
1da177e4 2610
5bc3eb7e
SH		 2611 if (ops->ndo_do_ioctl) {
2612 mm_segment_t oldfs = get_fs();
2613
2614 set_fs(KERNEL_DS);
2615 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2616 set_fs(oldfs);
2617 } else
2618 err = -EOPNOTSUPP;
1da177e4
LT		 2619
2620 if (err == 0) {
2621 err = -ENOBUFS;
af284937
DL		 2622 dev = __dev_get_by_name(net, p.name);
2623 if (!dev)
1da177e4
LT		 2624 goto err_exit;
2625 err = dev_open(dev);
2626 }
2627 }
0be669bb 2628#endif
1da177e4
LT		 2629
2630err_exit:
2631 rtnl_unlock();
2632 return err;
2633}
2634
93a714d6
MC		 2635static int ipv6_mc_config(struct sock *sk, bool join,
2636 const struct in6_addr *addr, int ifindex)
2637{
2638 int ret;
2639
2640 ASSERT_RTNL();
2641
2642 lock_sock(sk);
2643 if (join)
54ff9ef3 2644 ret = ipv6_sock_mc_join(sk, ifindex, addr);
93a714d6 2645 else
54ff9ef3 2646 ret = ipv6_sock_mc_drop(sk, ifindex, addr);
93a714d6
MC		 2647 release_sock(sk);
2648
2649 return ret;
2650}
2651
1da177e4
LT		 2652/*
2653 * Manual configuration of address on an interface
2654 */
479840ff
JP		 2655static int inet6_addr_add(struct net *net, int ifindex,
2656 const struct in6_addr *pfx,
caeaba79 2657 const struct in6_addr *peer_pfx,
479840ff
JP		 2658 unsigned int plen, __u32 ifa_flags,
2659 __u32 prefered_lft, __u32 valid_lft)
1da177e4
LT		 2660{
2661 struct inet6_ifaddr *ifp;
2662 struct inet6_dev *idev;
2663 struct net_device *dev;
93a714d6
MC		 2664 unsigned long timeout;
2665 clock_t expires;
1da177e4 2666 int scope;
6f704992 2667 u32 flags;
1da177e4
LT		 2668
2669 ASSERT_RTNL();
1ab1457c 2670
24ef0da7
TG		 2671 if (plen > 128)
2672 return -EINVAL;
2673
0778769d
NT		 2674 /* check the lifetime */
2675 if (!valid_lft || prefered_lft > valid_lft)
2676 return -EINVAL;
2677
53bd6749
JP		 2678 if (ifa_flags & IFA_F_MANAGETEMPADDR && plen != 64)
2679 return -EINVAL;
2680
af284937
DL		 2681 dev = __dev_get_by_index(net, ifindex);
2682 if (!dev)
1da177e4 2683 return -ENODEV;
1ab1457c 2684
64e724f6
BH		 2685 idev = addrconf_add_dev(dev);
2686 if (IS_ERR(idev))
2687 return PTR_ERR(idev);
1da177e4 2688
93a714d6
MC		 2689 if (ifa_flags & IFA_F_MCAUTOJOIN) {
2690 int ret = ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2691 true, pfx, ifindex);
2692
2693 if (ret < 0)
2694 return ret;
2695 }
2696
1da177e4
LT		 2697 scope = ipv6_addr_scope(pfx);
2698
4bed72e4
YH		 2699 timeout = addrconf_timeout_fixup(valid_lft, HZ);
2700 if (addrconf_finite_timeout(timeout)) {
2701 expires = jiffies_to_clock_t(timeout * HZ);
2702 valid_lft = timeout;
6f704992 2703 flags = RTF_EXPIRES;
4bed72e4
YH		 2704 } else {
2705 expires = 0;
2706 flags = 0;
2707 ifa_flags |= IFA_F_PERMANENT;
6f704992 2708 }
0778769d 2709
4bed72e4
YH		 2710 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
2711 if (addrconf_finite_timeout(timeout)) {
2712 if (timeout == 0)
2713 ifa_flags |= IFA_F_DEPRECATED;
2714 prefered_lft = timeout;
2715 }
0778769d 2716
8a226b2c
JB		 2717 ifp = ipv6_add_addr(idev, pfx, peer_pfx, plen, scope, ifa_flags,
2718 valid_lft, prefered_lft);
0778769d 2719
1da177e4 2720 if (!IS_ERR(ifp)) {
761aac73
TH		 2721 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) {
2722 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
2723 expires, flags);
2724 }
2725
95c385b4
NH		 2726 /*
2727 * Note that section 3.1 of RFC 4429 indicates
2728 * that the Optimistic flag should not be set for
2729 * manually configured addresses
2730 */
cf22f9a2 2731 addrconf_dad_start(ifp);
53bd6749
JP		 2732 if (ifa_flags & IFA_F_MANAGETEMPADDR)
2733 manage_tempaddrs(idev, ifp, valid_lft, prefered_lft,
2734 true, jiffies);
1da177e4 2735 in6_ifa_put(ifp);
c15b1cca 2736 addrconf_verify_rtnl();
1da177e4 2737 return 0;
93a714d6
MC		 2738 } else if (ifa_flags & IFA_F_MCAUTOJOIN) {
2739 ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2740 false, pfx, ifindex);
1da177e4
LT		 2741 }
2742
2743 return PTR_ERR(ifp);
2744}
2745
6046d5b4
HK		 2746static int inet6_addr_del(struct net *net, int ifindex, u32 ifa_flags,
2747 const struct in6_addr *pfx, unsigned int plen)
1da177e4
LT		 2748{
2749 struct inet6_ifaddr *ifp;
2750 struct inet6_dev *idev;
2751 struct net_device *dev;
1ab1457c 2752
24ef0da7
TG		 2753 if (plen > 128)
2754 return -EINVAL;
2755
af284937
DL		 2756 dev = __dev_get_by_index(net, ifindex);
2757 if (!dev)
1da177e4
LT		 2758 return -ENODEV;
2759
e5d08d71 2760 idev = __in6_dev_get(dev);
63159f29 2761 if (!idev)
1da177e4
LT		 2762 return -ENXIO;
2763
2764 read_lock_bh(&idev->lock);
502a2ffd 2765 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1da177e4
LT		 2766 if (ifp->prefix_len == plen &&
2767 ipv6_addr_equal(pfx, &ifp->addr)) {
2768 in6_ifa_hold(ifp);
2769 read_unlock_bh(&idev->lock);
1ab1457c 2770
6046d5b4
HK		 2771 if (!(ifp->flags & IFA_F_TEMPORARY) &&
2772 (ifa_flags & IFA_F_MANAGETEMPADDR))
2773 manage_tempaddrs(idev, ifp, 0, 0, false,
2774 jiffies);
1da177e4 2775 ipv6_del_addr(ifp);
6046d5b4 2776 addrconf_verify_rtnl();
93a714d6
MC		 2777 if (ipv6_addr_is_multicast(pfx)) {
2778 ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2779 false, pfx, dev->ifindex);
2780 }
1da177e4
LT		 2781 return 0;
2782 }
2783 }
2784 read_unlock_bh(&idev->lock);
2785 return -EADDRNOTAVAIL;
2786}
2787
2788
af284937 2789int addrconf_add_ifaddr(struct net *net, void __user *arg)
1da177e4
LT		 2790{
2791 struct in6_ifreq ireq;
2792 int err;
1ab1457c 2793
af31f412 2794 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1da177e4 2795 return -EPERM;
1ab1457c 2796
1da177e4
LT		 2797 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2798 return -EFAULT;
2799
2800 rtnl_lock();
caeaba79 2801 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, NULL,
af284937
DL		 2802 ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2803 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
1da177e4
LT		 2804 rtnl_unlock();
2805 return err;
2806}
2807
af284937 2808int addrconf_del_ifaddr(struct net *net, void __user *arg)
1da177e4
LT		 2809{
2810 struct in6_ifreq ireq;
2811 int err;
1ab1457c 2812
af31f412 2813 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1da177e4
LT		 2814 return -EPERM;
2815
2816 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2817 return -EFAULT;
2818
2819 rtnl_lock();
6046d5b4 2820 err = inet6_addr_del(net, ireq.ifr6_ifindex, 0, &ireq.ifr6_addr,
af284937 2821 ireq.ifr6_prefixlen);
1da177e4
LT		 2822 rtnl_unlock();
2823 return err;
2824}
2825
b5f348e5
IJ		 2826static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
2827 int plen, int scope)
2828{
2829 struct inet6_ifaddr *ifp;
2830
8a226b2c 2831 ifp = ipv6_add_addr(idev, addr, NULL, plen,
07edd741
HFS		 2832 scope, IFA_F_PERMANENT,
2833 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
b5f348e5
IJ		 2834 if (!IS_ERR(ifp)) {
2835 spin_lock_bh(&ifp->lock);
2836 ifp->flags &= ~IFA_F_TENTATIVE;
2837 spin_unlock_bh(&ifp->lock);
2838 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2839 in6_ifa_put(ifp);
2840 }
2841}
2842
07a93626 2843#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4
LT		 2844static void sit_add_v4_addrs(struct inet6_dev *idev)
2845{
1da177e4
LT		 2846 struct in6_addr addr;
2847 struct net_device *dev;
c346dca1 2848 struct net *net = dev_net(idev->dev);
929c9cf3 2849 int scope, plen;
f0e2acfa 2850 u32 pflags = 0;
1da177e4
LT		 2851
2852 ASSERT_RTNL();
2853
2854 memset(&addr, 0, sizeof(struct in6_addr));
2855 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2856
2857 if (idev->dev->flags&IFF_POINTOPOINT) {
2858 addr.s6_addr32[0] = htonl(0xfe800000);
2859 scope = IFA_LINK;
929c9cf3 2860 plen = 64;
1da177e4
LT		 2861 } else {
2862 scope = IPV6_ADDR_COMPATv4;
929c9cf3 2863 plen = 96;
f0e2acfa 2864 pflags |= RTF_NONEXTHOP;
1da177e4
LT		 2865 }
2866
2867 if (addr.s6_addr32[3]) {
929c9cf3 2868 add_addr(idev, &addr, plen, scope);
f0e2acfa 2869 addrconf_prefix_route(&addr, plen, idev->dev, 0, pflags);
1da177e4
LT		 2870 return;
2871 }
2872
6fda7350 2873 for_each_netdev(net, dev) {
8e5e8f30 2874 struct in_device *in_dev = __in_dev_get_rtnl(dev);
1da177e4 2875 if (in_dev && (dev->flags & IFF_UP)) {
8e5e8f30 2876 struct in_ifaddr *ifa;
1da177e4
LT		 2877
2878 int flag = scope;
2879
2880 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
1da177e4
LT		 2881
2882 addr.s6_addr32[3] = ifa->ifa_local;
2883
2884 if (ifa->ifa_scope == RT_SCOPE_LINK)
2885 continue;
2886 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2887 if (idev->dev->flags&IFF_POINTOPOINT)
2888 continue;
2889 flag |= IFA_HOST;
2890 }
1da177e4 2891
b5f348e5 2892 add_addr(idev, &addr, plen, flag);
f0e2acfa
ND		 2893 addrconf_prefix_route(&addr, plen, idev->dev, 0,
2894 pflags);
1da177e4
LT		 2895 }
2896 }
1ab1457c 2897 }
1da177e4 2898}
0be669bb 2899#endif
1da177e4
LT		 2900
2901static void init_loopback(struct net_device *dev)
2902{
2903 struct inet6_dev *idev;
25fb6ca4
BK		 2904 struct net_device *sp_dev;
2905 struct inet6_ifaddr *sp_ifa;
2906 struct rt6_info *sp_rt;
1da177e4
LT		 2907
2908 /* ::1 */
2909
2910 ASSERT_RTNL();
2911
e5d08d71 2912 idev = ipv6_find_idev(dev);
63159f29 2913 if (!idev) {
91df42be 2914 pr_debug("%s: add_dev failed\n", __func__);
1da177e4
LT		 2915 return;
2916 }
2917
b5f348e5 2918 add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
25fb6ca4
BK		 2919
2920 /* Add routes to other interface's IPv6 addresses */
2921 for_each_netdev(dev_net(dev), sp_dev) {
2922 if (!strcmp(sp_dev->name, dev->name))
2923 continue;
2924
2925 idev = __in6_dev_get(sp_dev);
2926 if (!idev)
2927 continue;
2928
2929 read_lock_bh(&idev->lock);
2930 list_for_each_entry(sp_ifa, &idev->addr_list, if_list) {
2931
2932 if (sp_ifa->flags & (IFA_F_DADFAILED | IFA_F_TENTATIVE))
2933 continue;
2934
33d99113
G		 2935 if (sp_ifa->rt) {
2936 /* This dst has been added to garbage list when
2937 * lo device down, release this obsolete dst and
2938 * reallocate a new router for ifa.
2939 */
2940 if (sp_ifa->rt->dst.obsolete > 0) {
2941 ip6_rt_put(sp_ifa->rt);
2942 sp_ifa->rt = NULL;
2943 } else {
2944 continue;
2945 }
2946 }
a881ae1f 2947
57ec0afe 2948 sp_rt = addrconf_dst_alloc(idev, &sp_ifa->addr, false);
25fb6ca4
BK		 2949
2950 /* Failure cases are ignored */
534c8779
G		 2951 if (!IS_ERR(sp_rt)) {
2952 sp_ifa->rt = sp_rt;
25fb6ca4 2953 ip6_ins_rt(sp_rt);
534c8779 2954 }
25fb6ca4
BK		 2955 }
2956 read_unlock_bh(&idev->lock);
2957 }
1da177e4
LT		 2958}
2959
64236f3f
HFS		 2960static void addrconf_add_linklocal(struct inet6_dev *idev,
2961 const struct in6_addr *addr, u32 flags)
1da177e4 2962{
8e5e8f30 2963 struct inet6_ifaddr *ifp;
64236f3f 2964 u32 addr_flags = flags | IFA_F_PERMANENT;
95c385b4
NH		 2965
2966#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2967 if (idev->cnf.optimistic_dad &&
702beb87 2968 !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
95c385b4
NH		 2969 addr_flags |= IFA_F_OPTIMISTIC;
2970#endif
1da177e4 2971
07edd741
HFS		 2972 ifp = ipv6_add_addr(idev, addr, NULL, 64, IFA_LINK, addr_flags,
2973 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
1da177e4 2974 if (!IS_ERR(ifp)) {
46d48046 2975 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
cf22f9a2 2976 addrconf_dad_start(ifp);
1da177e4
LT		 2977 in6_ifa_put(ifp);
2978 }
2979}
2980
622c81d5
HFS		 2981static bool ipv6_reserved_interfaceid(struct in6_addr address)
2982{
2983 if ((address.s6_addr32[2] | address.s6_addr32[3]) == 0)
2984 return true;
2985
2986 if (address.s6_addr32[2] == htonl(0x02005eff) &&
2987 ((address.s6_addr32[3] & htonl(0xfe000000)) == htonl(0xfe000000)))
2988 return true;
2989
2990 if (address.s6_addr32[2] == htonl(0xfdffffff) &&
2991 ((address.s6_addr32[3] & htonl(0xffffff80)) == htonl(0xffffff80)))
2992 return true;
2993
2994 return false;
2995}
2996
2997static int ipv6_generate_stable_address(struct in6_addr *address,
2998 u8 dad_count,
2999 const struct inet6_dev *idev)
3000{
622c81d5
HFS		 3001 static DEFINE_SPINLOCK(lock);
3002 static __u32 digest[SHA_DIGEST_WORDS];
3003 static __u32 workspace[SHA_WORKSPACE_WORDS];
3004
3005 static union {
3006 char __data[SHA_MESSAGE_BYTES];
3007 struct {
3008 struct in6_addr secret;
ff40217e 3009 __be32 prefix[2];
622c81d5
HFS		 3010 unsigned char hwaddr[MAX_ADDR_LEN];
3011 u8 dad_count;
3012 } __packed;
3013 } data;
3014
3015 struct in6_addr secret;
3016 struct in6_addr temp;
3017 struct net *net = dev_net(idev->dev);
3018
3019 BUILD_BUG_ON(sizeof(data.__data) != sizeof(data));
3020
3021 if (idev->cnf.stable_secret.initialized)
3022 secret = idev->cnf.stable_secret.secret;
3023 else if (net->ipv6.devconf_dflt->stable_secret.initialized)
3024 secret = net->ipv6.devconf_dflt->stable_secret.secret;
3025 else
3026 return -1;
3027
3028retry:
3029 spin_lock_bh(&lock);
3030
3031 sha_init(digest);
3032 memset(&data, 0, sizeof(data));
3033 memset(workspace, 0, sizeof(workspace));
3034 memcpy(data.hwaddr, idev->dev->perm_addr, idev->dev->addr_len);
ff40217e
HFS		 3035 data.prefix[0] = address->s6_addr32[0];
3036 data.prefix[1] = address->s6_addr32[1];
622c81d5
HFS		 3037 data.secret = secret;
3038 data.dad_count = dad_count;
3039
3040 sha_transform(digest, data.__data, workspace);
3041
3042 temp = *address;
ff40217e
HFS		 3043 temp.s6_addr32[2] = (__force __be32)digest[0];
3044 temp.s6_addr32[3] = (__force __be32)digest[1];
622c81d5
HFS		 3045
3046 spin_unlock_bh(&lock);
3047
3048 if (ipv6_reserved_interfaceid(temp)) {
3049 dad_count++;
1855b7c3 3050 if (dad_count > dev_net(idev->dev)->ipv6.sysctl.idgen_retries)
622c81d5
HFS		 3051 return -1;
3052 goto retry;
3053 }
3054
3055 *address = temp;
3056 return 0;
3057}
3058
bc91b0f0
JP		 3059static void addrconf_addr_gen(struct inet6_dev *idev, bool prefix_route)
3060{
622c81d5
HFS		 3061 struct in6_addr addr;
3062
3063 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
bc91b0f0 3064
622c81d5
HFS		 3065 if (idev->addr_gen_mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY) {
3066 if (!ipv6_generate_stable_address(&addr, 0, idev))
64236f3f
HFS		 3067 addrconf_add_linklocal(idev, &addr,
3068 IFA_F_STABLE_PRIVACY);
622c81d5
HFS		 3069 else if (prefix_route)
3070 addrconf_prefix_route(&addr, 64, idev->dev, 0, 0);
3071 } else if (idev->addr_gen_mode == IN6_ADDR_GEN_MODE_EUI64) {
bc91b0f0
JP		 3072 /* addrconf_add_linklocal also adds a prefix_route and we
3073 * only need to care about prefix routes if ipv6_generate_eui64
3074 * couldn't generate one.
3075 */
3076 if (ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) == 0)
64236f3f 3077 addrconf_add_linklocal(idev, &addr, 0);
bc91b0f0
JP		 3078 else if (prefix_route)
3079 addrconf_prefix_route(&addr, 64, idev->dev, 0, 0);
3080 }
3081}
3082
1da177e4
LT		 3083static void addrconf_dev_config(struct net_device *dev)
3084{
8e5e8f30 3085 struct inet6_dev *idev;
1da177e4
LT		 3086
3087 ASSERT_RTNL();
3088
74235a25
HX		 3089 if ((dev->type != ARPHRD_ETHER) &&
3090 (dev->type != ARPHRD_FDDI) &&
74235a25 3091 (dev->type != ARPHRD_ARCNET) &&
06a4c1c5 3092 (dev->type != ARPHRD_INFINIBAND) &&
cb6bf355 3093 (dev->type != ARPHRD_IEEE802154) &&
e837735e 3094 (dev->type != ARPHRD_IEEE1394) &&
e74bccb8
JR		 3095 (dev->type != ARPHRD_TUNNEL6) &&
3096 (dev->type != ARPHRD_6LOWPAN)) {
74235a25
HX		 3097 /* Alas, we support only Ethernet autoconfiguration. */
3098 return;
3099 }
3100
1da177e4 3101 idev = addrconf_add_dev(dev);
64e724f6 3102 if (IS_ERR(idev))
1da177e4
LT		 3103 return;
3104
bc91b0f0 3105 addrconf_addr_gen(idev, false);
1da177e4
LT		 3106}
3107
07a93626 3108#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4
LT		 3109static void addrconf_sit_config(struct net_device *dev)
3110{
3111 struct inet6_dev *idev;
3112
3113 ASSERT_RTNL();
3114
1ab1457c
YH		 3115 /*
3116 * Configure the tunnel with one of our IPv4
3117 * addresses... we should configure all of
1da177e4
LT		 3118 * our v4 addrs in the tunnel
3119 */
3120
e5d08d71 3121 idev = ipv6_find_idev(dev);
63159f29 3122 if (!idev) {
91df42be 3123 pr_debug("%s: add_dev failed\n", __func__);
1da177e4
LT		 3124 return;
3125 }
3126
c7dc89c0 3127 if (dev->priv_flags & IFF_ISATAP) {
bc91b0f0 3128 addrconf_addr_gen(idev, false);
c7dc89c0
FT		 3129 return;
3130 }
3131
1da177e4
LT		 3132 sit_add_v4_addrs(idev);
3133
62b54dd9 3134 if (dev->flags&IFF_POINTOPOINT)
1da177e4 3135 addrconf_add_mroute(dev);
1da177e4 3136}
0be669bb 3137#endif
1da177e4 3138
07a93626 3139#if IS_ENABLED(CONFIG_NET_IPGRE)
aee80b54 3140static void addrconf_gre_config(struct net_device *dev)
3141{
3142 struct inet6_dev *idev;
aee80b54 3143
aee80b54 3144 ASSERT_RTNL();
3145
e5d08d71 3146 idev = ipv6_find_idev(dev);
63159f29 3147 if (!idev) {
91df42be 3148 pr_debug("%s: add_dev failed\n", __func__);
aee80b54 3149 return;
3150 }
3151
bc91b0f0 3152 addrconf_addr_gen(idev, true);
aee80b54 3153}
3154#endif
3155
1ab1457c 3156static int addrconf_notify(struct notifier_block *this, unsigned long event,
351638e7 3157 void *ptr)
1da177e4 3158{
351638e7 3159 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
748e2d93 3160 struct inet6_dev *idev = __in6_dev_get(dev);
c5e33bdd 3161 int run_pending = 0;
b217d616 3162 int err;
1da177e4 3163
e21e8467 3164 switch (event) {
45ba9dd2 3165 case NETDEV_REGISTER:
74235a25 3166 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
45ba9dd2 3167 idev = ipv6_add_dev(dev);
a317a2f1
WC		 3168 if (IS_ERR(idev))
3169 return notifier_from_errno(PTR_ERR(idev));
45ba9dd2
YH		 3170 }
3171 break;
bcdd553f 3172
1da177e4 3173 case NETDEV_UP:
3c21edbd 3174 case NETDEV_CHANGE:
c2edacf8
JV		 3175 if (dev->flags & IFF_SLAVE)
3176 break;
3177
3ce62a84
WC		 3178 if (idev && idev->cnf.disable_ipv6)
3179 break;
3180
3c21edbd 3181 if (event == NETDEV_UP) {
f24e3d65 3182 if (!addrconf_qdisc_ok(dev)) {
3c21edbd 3183 /* device is not ready yet. */
f3213831 3184 pr_info("ADDRCONF(NETDEV_UP): %s: link is not ready\n",
3c21edbd
YH		 3185 dev->name);
3186 break;
3187 }
99081049 3188
d31c7b8f
EP		 3189 if (!idev && dev->mtu >= IPV6_MIN_MTU)
3190 idev = ipv6_add_dev(dev);
3191
a317a2f1 3192 if (!IS_ERR_OR_NULL(idev)) {
99081049 3193 idev->if_flags |= IF_READY;
e3ec6cfc
BT		 3194 run_pending = 1;
3195 }
3c21edbd 3196 } else {
f24e3d65 3197 if (!addrconf_qdisc_ok(dev)) {
3c21edbd
YH		 3198 /* device is still not ready. */
3199 break;
3200 }
3201
3202 if (idev) {
bcdd553f 3203 if (idev->if_flags & IF_READY)
3c21edbd
YH		 3204 /* device is already configured. */
3205 break;
3c21edbd
YH		 3206 idev->if_flags |= IF_READY;
3207 }
3208
f3213831
JP		 3209 pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n",
3210 dev->name);
3c21edbd 3211
c5e33bdd 3212 run_pending = 1;
3c21edbd
YH		 3213 }
3214
e21e8467 3215 switch (dev->type) {
07a93626 3216#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4
LT		 3217 case ARPHRD_SIT:
3218 addrconf_sit_config(dev);
3219 break;
aee80b54 3220#endif
07a93626 3221#if IS_ENABLED(CONFIG_NET_IPGRE)
aee80b54 3222 case ARPHRD_IPGRE:
3223 addrconf_gre_config(dev);
3224 break;
0be669bb 3225#endif
1da177e4
LT		 3226 case ARPHRD_LOOPBACK:
3227 init_loopback(dev);
3228 break;
3229
3230 default:
3231 addrconf_dev_config(dev);
3232 break;
3ff50b79 3233 }
bcdd553f 3234
a317a2f1 3235 if (!IS_ERR_OR_NULL(idev)) {
c5e33bdd
YH		 3236 if (run_pending)
3237 addrconf_dad_run(idev);
3238
bcdd553f
SH		 3239 /*
3240 * If the MTU changed during the interface down,
3241 * when the interface up, the changed MTU must be
3242 * reflected in the idev as well as routers.
1da177e4 3243 */
bcdd553f
SH		 3244 if (idev->cnf.mtu6 != dev->mtu &&
3245 dev->mtu >= IPV6_MIN_MTU) {
1da177e4
LT		 3246 rt6_mtu_change(dev, dev->mtu);
3247 idev->cnf.mtu6 = dev->mtu;
3248 }
3249 idev->tstamp = jiffies;
3250 inet6_ifinfo_notify(RTM_NEWLINK, idev);
bcdd553f
SH		 3251
3252 /*
3253 * If the changed mtu during down is lower than
3254 * IPV6_MIN_MTU stop IPv6 on this interface.
1da177e4
LT		 3255 */
3256 if (dev->mtu < IPV6_MIN_MTU)
bcdd553f 3257 addrconf_ifdown(dev, 1);
1da177e4
LT		 3258 }
3259 break;
3260
3261 case NETDEV_CHANGEMTU:
d31c7b8f 3262 if (idev && dev->mtu >= IPV6_MIN_MTU) {
1da177e4
LT		 3263 rt6_mtu_change(dev, dev->mtu);
3264 idev->cnf.mtu6 = dev->mtu;
3265 break;
3266 }
3267
d31c7b8f
EP		 3268 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
3269 idev = ipv6_add_dev(dev);
a317a2f1 3270 if (!IS_ERR(idev))
d31c7b8f
EP		 3271 break;
3272 }
3273
bcdd553f 3274 /*
db9c7c39 3275 * if MTU under IPV6_MIN_MTU.
bcdd553f
SH		 3276 * Stop IPv6 on this interface.
3277 */
1da177e4
LT		 3278
3279 case NETDEV_DOWN:
3280 case NETDEV_UNREGISTER:
3281 /*
3282 * Remove all addresses from this interface.
3283 */
3284 addrconf_ifdown(dev, event != NETDEV_DOWN);
3285 break;
3c21edbd 3286
1da177e4 3287 case NETDEV_CHANGENAME:
1da177e4 3288 if (idev) {
5632c515 3289 snmp6_unregister_dev(idev);
408c4768 3290 addrconf_sysctl_unregister(idev);
a317a2f1 3291 err = addrconf_sysctl_register(idev);
b217d616
HX		 3292 if (err)
3293 return notifier_from_errno(err);
a317a2f1
WC		 3294 err = snmp6_register_dev(idev);
3295 if (err) {
3296 addrconf_sysctl_unregister(idev);
3297 return notifier_from_errno(err);
3298 }
5632c515 3299 }
1da177e4 3300 break;
bcdd553f 3301
93d9b7d7
JP		 3302 case NETDEV_PRE_TYPE_CHANGE:
3303 case NETDEV_POST_TYPE_CHANGE:
3304 addrconf_type_change(dev, event);
75c78500 3305 break;
3ff50b79 3306 }
1da177e4
LT		 3307
3308 return NOTIFY_OK;
3309}
3310
3311/*
3312 * addrconf module should be notified of a device going up
3313 */
3314static struct notifier_block ipv6_dev_notf = {
3315 .notifier_call = addrconf_notify,
1da177e4
LT		 3316};
3317
93d9b7d7 3318static void addrconf_type_change(struct net_device *dev, unsigned long event)
75c78500
MS		 3319{
3320 struct inet6_dev *idev;
3321 ASSERT_RTNL();
3322
3323 idev = __in6_dev_get(dev);
3324
93d9b7d7 3325 if (event == NETDEV_POST_TYPE_CHANGE)
75c78500 3326 ipv6_mc_remap(idev);
93d9b7d7 3327 else if (event == NETDEV_PRE_TYPE_CHANGE)
75c78500
MS		 3328 ipv6_mc_unmap(idev);
3329}
3330
1da177e4
LT		 3331static int addrconf_ifdown(struct net_device *dev, int how)
3332{
c346dca1 3333 struct net *net = dev_net(dev);
502a2ffd 3334 struct inet6_dev *idev;
3335 struct inet6_ifaddr *ifa;
73a8bd74 3336 int state, i;
1da177e4
LT		 3337
3338 ASSERT_RTNL();
3339
73a8bd74
DM		 3340 rt6_ifdown(net, dev);
3341 neigh_ifdown(&nd_tbl, dev);
1da177e4
LT		 3342
3343 idev = __in6_dev_get(dev);
63159f29 3344 if (!idev)
1da177e4
LT		 3345 return -ENODEV;
3346
bcdd553f
SH		 3347 /*
3348 * Step 1: remove reference to ipv6 device from parent device.
3349 * Do not dev_put!
1da177e4 3350 */
439e2385 3351 if (how) {
1da177e4 3352 idev->dead = 1;
8814c4b5
YH		 3353
3354 /* protected by rtnl_lock */
a9b3cd7f 3355 RCU_INIT_POINTER(dev->ip6_ptr, NULL);
1da177e4
LT		 3356
3357 /* Step 1.5: remove snmp6 entry */
3358 snmp6_unregister_dev(idev);
3359
3360 }
3361
73a8bd74
DM		 3362 /* Step 2: clear hash table */
3363 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3364 struct hlist_head *h = &inet6_addr_lst[i];
73a8bd74
DM		 3365
3366 spin_lock_bh(&addrconf_hash_lock);
67ba4152 3367restart:
b67bfe0d 3368 hlist_for_each_entry_rcu(ifa, h, addr_lst) {
73a8bd74
DM		 3369 if (ifa->idev == idev) {
3370 hlist_del_init_rcu(&ifa->addr_lst);
c15b1cca 3371 addrconf_del_dad_work(ifa);
73a8bd74
DM		 3372 goto restart;
3373 }
3374 }
3375 spin_unlock_bh(&addrconf_hash_lock);
3376 }
3377
1da177e4
LT		 3378 write_lock_bh(&idev->lock);
3379
b7b1bfce
HFS		 3380 addrconf_del_rs_timer(idev);
3381
bcdd553f 3382 /* Step 2: clear flags for stateless addrconf */
439e2385 3383 if (!how)
3c21edbd 3384 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
1da177e4 3385
439e2385 3386 if (how && del_timer(&idev->regen_timer))
1da177e4
LT		 3387 in6_dev_put(idev);
3388
bcdd553f 3389 /* Step 3: clear tempaddr list */
372e6c8f 3390 while (!list_empty(&idev->tempaddr_list)) {
3391 ifa = list_first_entry(&idev->tempaddr_list,
3392 struct inet6_ifaddr, tmp_list);
3393 list_del(&ifa->tmp_list);
1da177e4
LT		 3394 write_unlock_bh(&idev->lock);
3395 spin_lock_bh(&ifa->lock);
3396
3397 if (ifa->ifpub) {
3398 in6_ifa_put(ifa->ifpub);
3399 ifa->ifpub = NULL;
3400 }
3401 spin_unlock_bh(&ifa->lock);
3402 in6_ifa_put(ifa);
3403 write_lock_bh(&idev->lock);
3404 }
8f37ada5 3405
502a2ffd 3406 while (!list_empty(&idev->addr_list)) {
3407 ifa = list_first_entry(&idev->addr_list,
3408 struct inet6_ifaddr, if_list);
c15b1cca 3409 addrconf_del_dad_work(ifa);
84e8b803 3410
73a8bd74 3411 list_del(&ifa->if_list);
84e8b803 3412
73a8bd74 3413 write_unlock_bh(&idev->lock);
84e8b803 3414
8e8e676d 3415 spin_lock_bh(&ifa->lock);
73a8bd74
DM		 3416 state = ifa->state;
3417 ifa->state = INET6_IFADDR_STATE_DEAD;
8e8e676d 3418 spin_unlock_bh(&ifa->lock);
9d82ca98 3419
73a8bd74
DM		 3420 if (state != INET6_IFADDR_STATE_DEAD) {
3421 __ipv6_ifa_notify(RTM_DELADDR, ifa);
f88c91dd 3422 inet6addr_notifier_call_chain(NETDEV_DOWN, ifa);
27bdb2ab 3423 }
73a8bd74 3424 in6_ifa_put(ifa);
8f37ada5 3425
73a8bd74
DM		 3426 write_lock_bh(&idev->lock);
3427 }
8f37ada5 3428
1da177e4
LT		 3429 write_unlock_bh(&idev->lock);
3430
381f4dca
SD		 3431 /* Step 5: Discard anycast and multicast list */
3432 if (how) {
3433 ipv6_ac_destroy_dev(idev);
1da177e4 3434 ipv6_mc_destroy_dev(idev);
381f4dca 3435 } else {
1da177e4 3436 ipv6_mc_down(idev);
381f4dca 3437 }
1da177e4 3438
1da177e4 3439 idev->tstamp = jiffies;
1ab1457c 3440
bcdd553f 3441 /* Last: Shot the device (if unregistered) */
439e2385 3442 if (how) {
408c4768 3443 addrconf_sysctl_unregister(idev);
1da177e4
LT		 3444 neigh_parms_release(&nd_tbl, idev->nd_parms);
3445 neigh_ifdown(&nd_tbl, dev);
3446 in6_dev_put(idev);
3447 }
3448 return 0;
3449}
3450
3451static void addrconf_rs_timer(unsigned long data)
3452{
b7b1bfce 3453 struct inet6_dev *idev = (struct inet6_dev *)data;
caf92bc4 3454 struct net_device *dev = idev->dev;
b7b1bfce 3455 struct in6_addr lladdr;
1da177e4 3456
b7b1bfce 3457 write_lock(&idev->lock);
5b2a1953 3458 if (idev->dead || !(idev->if_flags & IF_READY))
1da177e4
LT		 3459 goto out;
3460
9ba2add3 3461 if (!ipv6_accept_ra(idev))
5b2a1953 3462 goto out;
3463
3464 /* Announcement received after solicitation was sent */
3465 if (idev->if_flags & IF_RA_RCVD)
1da177e4 3466 goto out;
1da177e4 3467
b7b1bfce 3468 if (idev->rs_probes++ < idev->cnf.rtr_solicits) {
caf92bc4
CW		 3469 write_unlock(&idev->lock);
3470 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
3471 ndisc_send_rs(dev, &lladdr,
b7b1bfce
HFS		 3472 &in6addr_linklocal_allrouters);
3473 else
caf92bc4 3474 goto put;
1da177e4 3475
caf92bc4 3476 write_lock(&idev->lock);
b7b1bfce
HFS		 3477 /* The wait after the last probe can be shorter */
3478 addrconf_mod_rs_timer(idev, (idev->rs_probes ==
3479 idev->cnf.rtr_solicits) ?
3480 idev->cnf.rtr_solicit_delay :
3481 idev->cnf.rtr_solicit_interval);
1da177e4 3482 } else {
1da177e4
LT		 3483 /*
3484 * Note: we do not support deprecated "all on-link"
3485 * assumption any longer.
3486 */
91df42be 3487 pr_debug("%s: no IPv6 routers present\n", idev->dev->name);
1da177e4
LT		 3488 }
3489
3490out:
b7b1bfce 3491 write_unlock(&idev->lock);
caf92bc4 3492put:
b7b1bfce 3493 in6_dev_put(idev);
1da177e4
LT		 3494}
3495
3496/*
3497 * Duplicate Address Detection
3498 */
3c21edbd
YH		 3499static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
3500{
3501 unsigned long rand_num;
3502 struct inet6_dev *idev = ifp->idev;
3503
95c385b4
NH		 3504 if (ifp->flags & IFA_F_OPTIMISTIC)
3505 rand_num = 0;
3506 else
63862b5b 3507 rand_num = prandom_u32() % (idev->cnf.rtr_solicit_delay ? : 1);
95c385b4 3508
b7b1bfce 3509 ifp->dad_probes = idev->cnf.dad_transmits;
c15b1cca 3510 addrconf_mod_dad_work(ifp, rand_num);
3c21edbd
YH		 3511}
3512
c15b1cca 3513static void addrconf_dad_begin(struct inet6_ifaddr *ifp)
1da177e4
LT		 3514{
3515 struct inet6_dev *idev = ifp->idev;
3516 struct net_device *dev = idev->dev;
1da177e4
LT		 3517
3518 addrconf_join_solict(dev, &ifp->addr);
3519
63862b5b 3520 prandom_seed((__force u32) ifp->addr.s6_addr32[3]);
1da177e4
LT		 3521
3522 read_lock_bh(&idev->lock);
622ccdf1 3523 spin_lock(&ifp->lock);
e9d3e084 3524 if (ifp->state == INET6_IFADDR_STATE_DEAD)
1da177e4 3525 goto out;
1da177e4
LT		 3526
3527 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
1b34be74 3528 idev->cnf.accept_dad < 1 ||
55ebaef1
NT		 3529 !(ifp->flags&IFA_F_TENTATIVE) ||
3530 ifp->flags & IFA_F_NODAD) {
cc411d0b 3531 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
21809faf 3532 spin_unlock(&ifp->lock);
1da177e4
LT		 3533 read_unlock_bh(&idev->lock);
3534
3535 addrconf_dad_completed(ifp);
3536 return;
3537 }
3538
6732bade 3539 if (!(idev->if_flags & IF_READY)) {
21809faf 3540 spin_unlock(&ifp->lock);
6732bade 3541 read_unlock_bh(&idev->lock);
3c21edbd 3542 /*
590a9887 3543 * If the device is not ready:
3c21edbd
YH		 3544 * - keep it tentative if it is a permanent address.
3545 * - otherwise, kill it.
3546 */
3547 in6_ifa_hold(ifp);
cc411d0b 3548 addrconf_dad_stop(ifp, 0);
6732bade 3549 return;
3c21edbd 3550 }
95c385b4
NH		 3551
3552 /*
3553 * Optimistic nodes can start receiving
3554 * Frames right away
3555 */
7fd2561e 3556 if (ifp->flags & IFA_F_OPTIMISTIC) {
95c385b4 3557 ip6_ins_rt(ifp->rt);
7fd2561e
EK		 3558 if (ipv6_use_optimistic_addr(idev)) {
3559 /* Because optimistic nodes can use this address,
3560 * notify listeners. If DAD fails, RTM_DELADDR is sent.
3561 */
3562 ipv6_ifa_notify(RTM_NEWADDR, ifp);
3563 }
3564 }
95c385b4 3565
6732bade 3566 addrconf_dad_kick(ifp);
1da177e4 3567out:
622ccdf1 3568 spin_unlock(&ifp->lock);
1da177e4
LT		 3569 read_unlock_bh(&idev->lock);
3570}
3571
c15b1cca 3572static void addrconf_dad_start(struct inet6_ifaddr *ifp)
1da177e4 3573{
c15b1cca
HFS		 3574 bool begin_dad = false;
3575
8e8e676d 3576 spin_lock_bh(&ifp->lock);
c15b1cca
HFS		 3577 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
3578 ifp->state = INET6_IFADDR_STATE_PREDAD;
3579 begin_dad = true;
3580 }
8e8e676d 3581 spin_unlock_bh(&ifp->lock);
c15b1cca
HFS		 3582
3583 if (begin_dad)
3584 addrconf_mod_dad_work(ifp, 0);
3585}
3586
3587static void addrconf_dad_work(struct work_struct *w)
3588{
3589 struct inet6_ifaddr *ifp = container_of(to_delayed_work(w),
3590 struct inet6_ifaddr,
3591 dad_work);
1da177e4 3592 struct inet6_dev *idev = ifp->idev;
1da177e4
LT		 3593 struct in6_addr mcaddr;
3594
c15b1cca
HFS		 3595 enum {
3596 DAD_PROCESS,
3597 DAD_BEGIN,
3598 DAD_ABORT,
3599 } action = DAD_PROCESS;
3600
3601 rtnl_lock();
3602
8e8e676d 3603 spin_lock_bh(&ifp->lock);
c15b1cca
HFS		 3604 if (ifp->state == INET6_IFADDR_STATE_PREDAD) {
3605 action = DAD_BEGIN;
3606 ifp->state = INET6_IFADDR_STATE_DAD;
3607 } else if (ifp->state == INET6_IFADDR_STATE_ERRDAD) {
3608 action = DAD_ABORT;
3609 ifp->state = INET6_IFADDR_STATE_POSTDAD;
3610 }
8e8e676d 3611 spin_unlock_bh(&ifp->lock);
c15b1cca
HFS		 3612
3613 if (action == DAD_BEGIN) {
3614 addrconf_dad_begin(ifp);
3615 goto out;
3616 } else if (action == DAD_ABORT) {
3617 addrconf_dad_stop(ifp, 1);
3618 goto out;
3619 }
3620
b7b1bfce 3621 if (!ifp->dad_probes && addrconf_dad_end(ifp))
f2344a13
HX		 3622 goto out;
3623
c15b1cca 3624 write_lock_bh(&idev->lock);
122e4519 3625 if (idev->dead || !(idev->if_flags & IF_READY)) {
c15b1cca 3626 write_unlock_bh(&idev->lock);
1da177e4
LT		 3627 goto out;
3628 }
21809faf 3629
3630 spin_lock(&ifp->lock);
622ccdf1
HX		 3631 if (ifp->state == INET6_IFADDR_STATE_DEAD) {
3632 spin_unlock(&ifp->lock);
c15b1cca 3633 write_unlock_bh(&idev->lock);
622ccdf1
HX		 3634 goto out;
3635 }
3636
b7b1bfce 3637 if (ifp->dad_probes == 0) {
1da177e4
LT		 3638 /*
3639 * DAD was successful
3640 */
3641
cc411d0b 3642 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
21809faf 3643 spin_unlock(&ifp->lock);
c15b1cca 3644 write_unlock_bh(&idev->lock);
1da177e4
LT		 3645
3646 addrconf_dad_completed(ifp);
3647
3648 goto out;
3649 }
3650
b7b1bfce 3651 ifp->dad_probes--;
c15b1cca
HFS		 3652 addrconf_mod_dad_work(ifp,
3653 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME));
21809faf 3654 spin_unlock(&ifp->lock);
c15b1cca 3655 write_unlock_bh(&idev->lock);
1da177e4
LT		 3656
3657 /* send a neighbour solicitation for our addr */
1da177e4 3658 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
ab450605 3659 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &in6addr_any, NULL);
1da177e4
LT		 3660out:
3661 in6_ifa_put(ifp);
c15b1cca 3662 rtnl_unlock();
1da177e4
LT		 3663}
3664
11ffff75
HFS		 3665/* ifp->idev must be at least read locked */
3666static bool ipv6_lonely_lladdr(struct inet6_ifaddr *ifp)
3667{
3668 struct inet6_ifaddr *ifpiter;
3669 struct inet6_dev *idev = ifp->idev;
3670
602582ca
HFS		 3671 list_for_each_entry_reverse(ifpiter, &idev->addr_list, if_list) {
3672 if (ifpiter->scope > IFA_LINK)
3673 break;
11ffff75
HFS		 3674 if (ifp != ifpiter && ifpiter->scope == IFA_LINK &&
3675 (ifpiter->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE|
3676 IFA_F_OPTIMISTIC|IFA_F_DADFAILED)) ==
3677 IFA_F_PERMANENT)
3678 return false;
3679 }
3680 return true;
3681}
3682
1da177e4
LT		 3683static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
3684{
e21e8467 3685 struct net_device *dev = ifp->idev->dev;
b7b1bfce 3686 struct in6_addr lladdr;
b173ee48 3687 bool send_rs, send_mld;
b7b1bfce 3688
c15b1cca 3689 addrconf_del_dad_work(ifp);
1da177e4
LT		 3690
3691 /*
3692 * Configure the address for reception. Now it is valid.
3693 */
3694
3695 ipv6_ifa_notify(RTM_NEWADDR, ifp);
3696
026359bc
TA		 3697 /* If added prefix is link local and we are prepared to process
3698 router advertisements, start sending router solicitations.
1da177e4
LT		 3699 */
3700
1ec047eb 3701 read_lock_bh(&ifp->idev->lock);
11ffff75 3702 send_mld = ifp->scope == IFA_LINK && ipv6_lonely_lladdr(ifp);
b173ee48
HFS		 3703 send_rs = send_mld &&
3704 ipv6_accept_ra(ifp->idev) &&
1ec047eb 3705 ifp->idev->cnf.rtr_solicits > 0 &&
b173ee48 3706 (dev->flags&IFF_LOOPBACK) == 0;
1ec047eb
HFS		 3707 read_unlock_bh(&ifp->idev->lock);
3708
b173ee48
HFS		 3709 /* While dad is in progress mld report's source address is in6_addrany.
3710 * Resend with proper ll now.
3711 */
3712 if (send_mld)
3713 ipv6_mc_dad_complete(ifp->idev);
3714
1ec047eb 3715 if (send_rs) {
1da177e4
LT		 3716 /*
3717 * If a host as already performed a random delay
3718 * [...] as part of DAD [...] there is no need
3719 * to delay again before sending the first RS
3720 */
1ec047eb 3721 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
b7b1bfce 3722 return;
1ec047eb 3723 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters);
1da177e4 3724
b7b1bfce
HFS		 3725 write_lock_bh(&ifp->idev->lock);
3726 spin_lock(&ifp->lock);
3727 ifp->idev->rs_probes = 1;
1da177e4 3728 ifp->idev->if_flags |= IF_RS_SENT;
b7b1bfce
HFS		 3729 addrconf_mod_rs_timer(ifp->idev,
3730 ifp->idev->cnf.rtr_solicit_interval);
3731 spin_unlock(&ifp->lock);
3732 write_unlock_bh(&ifp->idev->lock);
1da177e4
LT		 3733 }
3734}
3735
e21e8467
SH		 3736static void addrconf_dad_run(struct inet6_dev *idev)
3737{
c5e33bdd
YH		 3738 struct inet6_ifaddr *ifp;
3739
3740 read_lock_bh(&idev->lock);
502a2ffd 3741 list_for_each_entry(ifp, &idev->addr_list, if_list) {
21809faf 3742 spin_lock(&ifp->lock);
f2344a13
HX		 3743 if (ifp->flags & IFA_F_TENTATIVE &&
3744 ifp->state == INET6_IFADDR_STATE_DAD)
3745 addrconf_dad_kick(ifp);
21809faf 3746 spin_unlock(&ifp->lock);
c5e33bdd
YH		 3747 }
3748 read_unlock_bh(&idev->lock);
3749}
3750
1da177e4
LT		 3751#ifdef CONFIG_PROC_FS
3752struct if6_iter_state {
3c40090a 3753 struct seq_net_private p;
1da177e4 3754 int bucket;
1d578303 3755 int offset;
1da177e4
LT		 3756};
3757
1d578303 3758static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos)
1da177e4
LT		 3759{
3760 struct inet6_ifaddr *ifa = NULL;
3761 struct if6_iter_state *state = seq->private;
1218854a 3762 struct net *net = seq_file_net(seq);
1d578303 3763 int p = 0;
1da177e4 3764
1d578303
MM		 3765 /* initial bucket if pos is 0 */
3766 if (pos == 0) {
3767 state->bucket = 0;
3768 state->offset = 0;
3769 }
3770
3771 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
b67bfe0d 3772 hlist_for_each_entry_rcu_bh(ifa, &inet6_addr_lst[state->bucket],
1d578303 3773 addr_lst) {
9f0d3c27
ED		 3774 if (!net_eq(dev_net(ifa->idev->dev), net))
3775 continue;
1d578303
MM		 3776 /* sync with offset */
3777 if (p < state->offset) {
3778 p++;
3779 continue;
3780 }
3781 state->offset++;
9f0d3c27 3782 return ifa;
1d578303
MM		 3783 }
3784
3785 /* prepare for next bucket */
3786 state->offset = 0;
3787 p = 0;
1da177e4 3788 }
c2e21293 3789 return NULL;
1da177e4
LT		 3790}
3791
c2e21293 3792static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
3793 struct inet6_ifaddr *ifa)
1da177e4
LT		 3794{
3795 struct if6_iter_state *state = seq->private;
1218854a 3796 struct net *net = seq_file_net(seq);
1da177e4 3797
b67bfe0d 3798 hlist_for_each_entry_continue_rcu_bh(ifa, addr_lst) {
9f0d3c27
ED		 3799 if (!net_eq(dev_net(ifa->idev->dev), net))
3800 continue;
1d578303 3801 state->offset++;
9f0d3c27 3802 return ifa;
1d578303 3803 }
3c40090a 3804
c2e21293 3805 while (++state->bucket < IN6_ADDR_HSIZE) {
1d578303 3806 state->offset = 0;
b67bfe0d 3807 hlist_for_each_entry_rcu_bh(ifa,
c2e21293 3808 &inet6_addr_lst[state->bucket], addr_lst) {
9f0d3c27
ED		 3809 if (!net_eq(dev_net(ifa->idev->dev), net))
3810 continue;
1d578303 3811 state->offset++;
9f0d3c27 3812 return ifa;
c2e21293 3813 }
1da177e4 3814 }
3c40090a 3815
c2e21293 3816 return NULL;
1da177e4
LT		 3817}
3818
1da177e4 3819static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
4f70ecca 3820 __acquires(rcu_bh)
1da177e4 3821{
5c578aed 3822 rcu_read_lock_bh();
1d578303 3823 return if6_get_first(seq, *pos);
1da177e4
LT		 3824}
3825
3826static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3827{
3828 struct inet6_ifaddr *ifa;
3829
3830 ifa = if6_get_next(seq, v);
3831 ++*pos;
3832 return ifa;
3833}
3834
3835static void if6_seq_stop(struct seq_file *seq, void *v)
4f70ecca 3836 __releases(rcu_bh)
1da177e4 3837{
5c578aed 3838 rcu_read_unlock_bh();
1da177e4
LT		 3839}
3840
3841static int if6_seq_show(struct seq_file *seq, void *v)
3842{
3843 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
971a351c 3844 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
b071195d 3845 &ifp->addr,
1da177e4
LT		 3846 ifp->idev->dev->ifindex,
3847 ifp->prefix_len,
3848 ifp->scope,
971a351c 3849 (u8) ifp->flags,
1da177e4
LT		 3850 ifp->idev->dev->name);
3851 return 0;
3852}
3853
56b3d975 3854static const struct seq_operations if6_seq_ops = {
1da177e4
LT		 3855 .start = if6_seq_start,
3856 .next = if6_seq_next,
3857 .show = if6_seq_show,
3858 .stop = if6_seq_stop,
3859};
3860
3861static int if6_seq_open(struct inode *inode, struct file *file)
3862{
3c40090a
DL		 3863 return seq_open_net(inode, file, &if6_seq_ops,
3864 sizeof(struct if6_iter_state));
1da177e4
LT		 3865}
3866
9a32144e 3867static const struct file_operations if6_fops = {
1da177e4
LT		 3868 .owner = THIS_MODULE,
3869 .open = if6_seq_open,
3870 .read = seq_read,
3871 .llseek = seq_lseek,
3c40090a 3872 .release = seq_release_net,
1da177e4
LT		 3873};
3874
2c8c1e72 3875static int __net_init if6_proc_net_init(struct net *net)
1da177e4 3876{
d4beaa66 3877 if (!proc_create("if_inet6", S_IRUGO, net->proc_net, &if6_fops))
1da177e4
LT		 3878 return -ENOMEM;
3879 return 0;
3880}
3881
2c8c1e72 3882static void __net_exit if6_proc_net_exit(struct net *net)
3c40090a 3883{
ece31ffd 3884 remove_proc_entry("if_inet6", net->proc_net);
3c40090a
DL		 3885}
3886
3887static struct pernet_operations if6_proc_net_ops = {
67ba4152
IM		 3888 .init = if6_proc_net_init,
3889 .exit = if6_proc_net_exit,
3c40090a
DL		 3890};
3891
3892int __init if6_proc_init(void)
3893{
3894 return register_pernet_subsys(&if6_proc_net_ops);
3895}
3896
1da177e4
LT		 3897void if6_proc_exit(void)
3898{
3c40090a 3899 unregister_pernet_subsys(&if6_proc_net_ops);
1da177e4
LT		 3900}
3901#endif /* CONFIG_PROC_FS */
3902
07a93626 3903#if IS_ENABLED(CONFIG_IPV6_MIP6)
3b9f9a1c 3904/* Check if address is a home address configured on any interface. */
b71d1d42 3905int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr)
3b9f9a1c
NT		 3906{
3907 int ret = 0;
c2e21293 3908 struct inet6_ifaddr *ifp = NULL;
ddbe5032 3909 unsigned int hash = inet6_addr_hash(addr);
c2e21293 3910
5c578aed 3911 rcu_read_lock_bh();
b67bfe0d 3912 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
878628fb 3913 if (!net_eq(dev_net(ifp->idev->dev), net))
389f6612 3914 continue;
caad295f 3915 if (ipv6_addr_equal(&ifp->addr, addr) &&
3b9f9a1c
NT		 3916 (ifp->flags & IFA_F_HOMEADDRESS)) {
3917 ret = 1;
3918 break;
3919 }
3920 }
5c578aed 3921 rcu_read_unlock_bh();
3b9f9a1c
NT		 3922 return ret;
3923}
3924#endif
3925
1da177e4
LT		 3926/*
3927 * Periodic address status verification
3928 */
3929
c15b1cca 3930static void addrconf_verify_rtnl(void)
1da177e4 3931{
b2db7564 3932 unsigned long now, next, next_sec, next_sched;
1da177e4 3933 struct inet6_ifaddr *ifp;
1da177e4
LT		 3934 int i;
3935
c15b1cca
HFS		 3936 ASSERT_RTNL();
3937
5c578aed 3938 rcu_read_lock_bh();
1da177e4 3939 now = jiffies;
b2db7564 3940 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
1da177e4 3941
c15b1cca 3942 cancel_delayed_work(&addr_chk_work);
1da177e4 3943
bcdd553f 3944 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
1da177e4 3945restart:
c15b1cca 3946 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[i], addr_lst) {
1da177e4 3947 unsigned long age;
1da177e4 3948
fad8da3e
YA		 3949 /* When setting preferred_lft to a value not zero or
3950 * infinity, while valid_lft is infinity
3951 * IFA_F_PERMANENT has a non-infinity life time.
3952 */
3953 if ((ifp->flags & IFA_F_PERMANENT) &&
3954 (ifp->prefered_lft == INFINITY_LIFE_TIME))
1da177e4
LT		 3955 continue;
3956
3957 spin_lock(&ifp->lock);
b2db7564
YH		 3958 /* We try to batch several events at once. */
3959 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
1da177e4 3960
8f27ebb9
YH		 3961 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
3962 age >= ifp->valid_lft) {
1da177e4
LT		 3963 spin_unlock(&ifp->lock);
3964 in6_ifa_hold(ifp);
1da177e4
LT		 3965 ipv6_del_addr(ifp);
3966 goto restart;
8f27ebb9
YH		 3967 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
3968 spin_unlock(&ifp->lock);
3969 continue;
1da177e4 3970 } else if (age >= ifp->prefered_lft) {
a1ed0526 3971 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
1da177e4
LT		 3972 int deprecate = 0;
3973
3974 if (!(ifp->flags&IFA_F_DEPRECATED)) {
3975 deprecate = 1;
3976 ifp->flags |= IFA_F_DEPRECATED;
3977 }
3978
fad8da3e
YA		 3979 if ((ifp->valid_lft != INFINITY_LIFE_TIME) &&
3980 (time_before(ifp->tstamp + ifp->valid_lft * HZ, next)))
1da177e4
LT		 3981 next = ifp->tstamp + ifp->valid_lft * HZ;
3982
3983 spin_unlock(&ifp->lock);
3984
3985 if (deprecate) {
3986 in6_ifa_hold(ifp);
1da177e4
LT		 3987
3988 ipv6_ifa_notify(0, ifp);
3989 in6_ifa_put(ifp);
3990 goto restart;
3991 }
1da177e4
LT		 3992 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
3993 !(ifp->flags&IFA_F_TENTATIVE)) {
88949cf4 3994 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
3995 ifp->idev->cnf.dad_transmits *
1f9248e5 3996 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME) / HZ;
88949cf4 3997
1da177e4
LT		 3998 if (age >= ifp->prefered_lft - regen_advance) {
3999 struct inet6_ifaddr *ifpub = ifp->ifpub;
4000 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
4001 next = ifp->tstamp + ifp->prefered_lft * HZ;
4002 if (!ifp->regen_count && ifpub) {
4003 ifp->regen_count++;
4004 in6_ifa_hold(ifp);
4005 in6_ifa_hold(ifpub);
4006 spin_unlock(&ifp->lock);
5c578aed 4007
291d809b
HY		 4008 spin_lock(&ifpub->lock);
4009 ifpub->regen_count = 0;
4010 spin_unlock(&ifpub->lock);
1da177e4
LT		 4011 ipv6_create_tempaddr(ifpub, ifp);
4012 in6_ifa_put(ifpub);
4013 in6_ifa_put(ifp);
4014 goto restart;
4015 }
4016 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
4017 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
4018 spin_unlock(&ifp->lock);
1da177e4
LT		 4019 } else {
4020 /* ifp->prefered_lft <= ifp->valid_lft */
4021 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
4022 next = ifp->tstamp + ifp->prefered_lft * HZ;
4023 spin_unlock(&ifp->lock);
4024 }
4025 }
1da177e4
LT		 4026 }
4027
b2db7564
YH		 4028 next_sec = round_jiffies_up(next);
4029 next_sched = next;
4030
4031 /* If rounded timeout is accurate enough, accept it. */
4032 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
4033 next_sched = next_sec;
4034
4035 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
4036 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
4037 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
4038
ba3542e1 4039 ADBG(KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
4040 now, next, next_sec, next_sched);
c15b1cca 4041 mod_delayed_work(addrconf_wq, &addr_chk_work, next_sched - now);
5c578aed 4042 rcu_read_unlock_bh();
1da177e4
LT		 4043}
4044
c15b1cca
HFS		 4045static void addrconf_verify_work(struct work_struct *w)
4046{
4047 rtnl_lock();
4048 addrconf_verify_rtnl();
4049 rtnl_unlock();
4050}
4051
4052static void addrconf_verify(void)
4053{
4054 mod_delayed_work(addrconf_wq, &addr_chk_work, 0);
4055}
4056
caeaba79
ND		 4057static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local,
4058 struct in6_addr **peer_pfx)
461d8837
TG		 4059{
4060 struct in6_addr *pfx = NULL;
4061
caeaba79
ND		 4062 *peer_pfx = NULL;
4063
461d8837
TG		 4064 if (addr)
4065 pfx = nla_data(addr);
4066
4067 if (local) {
4068 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
caeaba79
ND		 4069 *peer_pfx = pfx;
4070 pfx = nla_data(local);
461d8837
TG		 4071 }
4072
4073 return pfx;
4074}
4075
ef7c79ed 4076static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
461d8837
TG		 4077 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
4078 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
4079 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
479840ff 4080 [IFA_FLAGS] = { .len = sizeof(u32) },
461d8837
TG		 4081};
4082
1da177e4 4083static int
661d2967 4084inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh)
1da177e4 4085{
3b1e0a65 4086 struct net *net = sock_net(skb->sk);
b933f716
TG		 4087 struct ifaddrmsg *ifm;
4088 struct nlattr *tb[IFA_MAX+1];
caeaba79 4089 struct in6_addr *pfx, *peer_pfx;
6046d5b4 4090 u32 ifa_flags;
b933f716 4091 int err;
1da177e4 4092
b933f716
TG		 4093 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
4094 if (err < 0)
4095 return err;
4096
4097 ifm = nlmsg_data(nlh);
caeaba79 4098 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
63159f29 4099 if (!pfx)
1da177e4
LT		 4100 return -EINVAL;
4101
6046d5b4
HK		 4102 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
4103
4104 /* We ignore other flags so far. */
4105 ifa_flags &= IFA_F_MANAGETEMPADDR;
4106
4107 return inet6_addr_del(net, ifm->ifa_index, ifa_flags, pfx,
4108 ifm->ifa_prefixlen);
1da177e4
LT		 4109}
4110
479840ff 4111static int inet6_addr_modify(struct inet6_ifaddr *ifp, u32 ifa_flags,
55ebaef1 4112 u32 prefered_lft, u32 valid_lft)
081bba5b 4113{
6f704992
YH		 4114 u32 flags;
4115 clock_t expires;
4bed72e4 4116 unsigned long timeout;
53bd6749 4117 bool was_managetempaddr;
5b84efec 4118 bool had_prefixroute;
46d48046 4119
c15b1cca
HFS		 4120 ASSERT_RTNL();
4121
081bba5b
NT		 4122 if (!valid_lft || (prefered_lft > valid_lft))
4123 return -EINVAL;
4124
53bd6749
JP		 4125 if (ifa_flags & IFA_F_MANAGETEMPADDR &&
4126 (ifp->flags & IFA_F_TEMPORARY || ifp->prefix_len != 64))
4127 return -EINVAL;
4128
4bed72e4
YH		 4129 timeout = addrconf_timeout_fixup(valid_lft, HZ);
4130 if (addrconf_finite_timeout(timeout)) {
4131 expires = jiffies_to_clock_t(timeout * HZ);
4132 valid_lft = timeout;
6f704992 4133 flags = RTF_EXPIRES;
4bed72e4
YH		 4134 } else {
4135 expires = 0;
4136 flags = 0;
4137 ifa_flags |= IFA_F_PERMANENT;
6f704992 4138 }
081bba5b 4139
4bed72e4
YH		 4140 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
4141 if (addrconf_finite_timeout(timeout)) {
4142 if (timeout == 0)
4143 ifa_flags |= IFA_F_DEPRECATED;
4144 prefered_lft = timeout;
4145 }
081bba5b
NT		 4146
4147 spin_lock_bh(&ifp->lock);
53bd6749 4148 was_managetempaddr = ifp->flags & IFA_F_MANAGETEMPADDR;
5b84efec
TH		 4149 had_prefixroute = ifp->flags & IFA_F_PERMANENT &&
4150 !(ifp->flags & IFA_F_NOPREFIXROUTE);
53bd6749 4151 ifp->flags &= ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD |
761aac73
TH		 4152 IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
4153 IFA_F_NOPREFIXROUTE);
53bd6749 4154 ifp->flags |= ifa_flags;
081bba5b
NT		 4155 ifp->tstamp = jiffies;
4156 ifp->valid_lft = valid_lft;
4157 ifp->prefered_lft = prefered_lft;
4158
4159 spin_unlock_bh(&ifp->lock);
4160 if (!(ifp->flags&IFA_F_TENTATIVE))
4161 ipv6_ifa_notify(0, ifp);
081bba5b 4162
761aac73
TH		 4163 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) {
4164 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
4165 expires, flags);
5b84efec
TH		 4166 } else if (had_prefixroute) {
4167 enum cleanup_prefix_rt_t action;
4168 unsigned long rt_expires;
4169
4170 write_lock_bh(&ifp->idev->lock);
4171 action = check_cleanup_prefix_route(ifp, &rt_expires);
4172 write_unlock_bh(&ifp->idev->lock);
4173
4174 if (action != CLEANUP_PREFIX_RT_NOP) {
4175 cleanup_prefix_route(ifp, rt_expires,
4176 action == CLEANUP_PREFIX_RT_DEL);
4177 }
761aac73 4178 }
53bd6749
JP		 4179
4180 if (was_managetempaddr || ifp->flags & IFA_F_MANAGETEMPADDR) {
4181 if (was_managetempaddr && !(ifp->flags & IFA_F_MANAGETEMPADDR))
4182 valid_lft = prefered_lft = 0;
4183 manage_tempaddrs(ifp->idev, ifp, valid_lft, prefered_lft,
4184 !was_managetempaddr, jiffies);
4185 }
4186
c15b1cca 4187 addrconf_verify_rtnl();
081bba5b
NT		 4188
4189 return 0;
4190}
4191
1da177e4 4192static int
661d2967 4193inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh)
1da177e4 4194{
3b1e0a65 4195 struct net *net = sock_net(skb->sk);
461d8837
TG		 4196 struct ifaddrmsg *ifm;
4197 struct nlattr *tb[IFA_MAX+1];
caeaba79 4198 struct in6_addr *pfx, *peer_pfx;
7198f8ce
TG		 4199 struct inet6_ifaddr *ifa;
4200 struct net_device *dev;
55ebaef1 4201 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
479840ff 4202 u32 ifa_flags;
461d8837 4203 int err;
1da177e4 4204
461d8837
TG		 4205 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
4206 if (err < 0)
4207 return err;
4208
4209 ifm = nlmsg_data(nlh);
caeaba79 4210 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
63159f29 4211 if (!pfx)
1da177e4
LT		 4212 return -EINVAL;
4213
461d8837 4214 if (tb[IFA_CACHEINFO]) {
0778769d 4215 struct ifa_cacheinfo *ci;
461d8837
TG		 4216
4217 ci = nla_data(tb[IFA_CACHEINFO]);
0778769d 4218 valid_lft = ci->ifa_valid;
461d8837
TG		 4219 preferred_lft = ci->ifa_prefered;
4220 } else {
4221 preferred_lft = INFINITY_LIFE_TIME;
4222 valid_lft = INFINITY_LIFE_TIME;
0778769d
NT		 4223 }
4224
af284937 4225 dev = __dev_get_by_index(net, ifm->ifa_index);
63159f29 4226 if (!dev)
7198f8ce
TG		 4227 return -ENODEV;
4228
479840ff
JP		 4229 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
4230
55ebaef1 4231 /* We ignore other flags so far. */
761aac73 4232 ifa_flags &= IFA_F_NODAD | IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
93a714d6 4233 IFA_F_NOPREFIXROUTE | IFA_F_MCAUTOJOIN;
55ebaef1 4234
1cab3da6 4235 ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
63159f29 4236 if (!ifa) {
7198f8ce
TG		 4237 /*
4238 * It would be best to check for !NLM_F_CREATE here but
db9c7c39 4239 * userspace already relies on not having to provide this.
7198f8ce 4240 */
caeaba79 4241 return inet6_addr_add(net, ifm->ifa_index, pfx, peer_pfx,
af284937
DL		 4242 ifm->ifa_prefixlen, ifa_flags,
4243 preferred_lft, valid_lft);
081bba5b
NT		 4244 }
4245
7198f8ce
TG		 4246 if (nlh->nlmsg_flags & NLM_F_EXCL ||
4247 !(nlh->nlmsg_flags & NLM_F_REPLACE))
4248 err = -EEXIST;
4249 else
55ebaef1 4250 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
7198f8ce
TG		 4251
4252 in6_ifa_put(ifa);
4253
4254 return err;
1da177e4
LT		 4255}
4256
479840ff 4257static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u32 flags,
101bb229
TG		 4258 u8 scope, int ifindex)
4259{
4260 struct ifaddrmsg *ifm;
4261
4262 ifm = nlmsg_data(nlh);
4263 ifm->ifa_family = AF_INET6;
4264 ifm->ifa_prefixlen = prefixlen;
4265 ifm->ifa_flags = flags;
4266 ifm->ifa_scope = scope;
4267 ifm->ifa_index = ifindex;
4268}
4269
85486af0
TG		 4270static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
4271 unsigned long tstamp, u32 preferred, u32 valid)
4272{
4273 struct ifa_cacheinfo ci;
4274
18a31e1e
TG		 4275 ci.cstamp = cstamp_delta(cstamp);
4276 ci.tstamp = cstamp_delta(tstamp);
85486af0
TG		 4277 ci.ifa_prefered = preferred;
4278 ci.ifa_valid = valid;
4279
4280 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
4281}
4282
101bb229
TG		 4283static inline int rt_scope(int ifa_scope)
4284{
4285 if (ifa_scope & IFA_HOST)
4286 return RT_SCOPE_HOST;
4287 else if (ifa_scope & IFA_LINK)
4288 return RT_SCOPE_LINK;
4289 else if (ifa_scope & IFA_SITE)
4290 return RT_SCOPE_SITE;
4291 else
4292 return RT_SCOPE_UNIVERSE;
4293}
4294
0ab6803b
TG		 4295static inline int inet6_ifaddr_msgsize(void)
4296{
339bf98f 4297 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
caeaba79 4298 + nla_total_size(16) /* IFA_LOCAL */
339bf98f 4299 + nla_total_size(16) /* IFA_ADDRESS */
479840ff
JP		 4300 + nla_total_size(sizeof(struct ifa_cacheinfo))
4301 + nla_total_size(4) /* IFA_FLAGS */;
0ab6803b 4302}
c5396a31 4303
1da177e4 4304static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
15e47304 4305 u32 portid, u32 seq, int event, unsigned int flags)
1da177e4 4306{
1da177e4 4307 struct nlmsghdr *nlh;
85486af0 4308 u32 preferred, valid;
1da177e4 4309
15e47304 4310 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
63159f29 4311 if (!nlh)
26932566 4312 return -EMSGSIZE;
0ab6803b 4313
101bb229
TG		 4314 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
4315 ifa->idev->dev->ifindex);
4316
fad8da3e
YA		 4317 if (!((ifa->flags&IFA_F_PERMANENT) &&
4318 (ifa->prefered_lft == INFINITY_LIFE_TIME))) {
85486af0
TG		 4319 preferred = ifa->prefered_lft;
4320 valid = ifa->valid_lft;
4321 if (preferred != INFINITY_LIFE_TIME) {
1da177e4 4322 long tval = (jiffies - ifa->tstamp)/HZ;
a1faa698
JR		 4323 if (preferred > tval)
4324 preferred -= tval;
4325 else
4326 preferred = 0;
f56619fc
BH		 4327 if (valid != INFINITY_LIFE_TIME) {
4328 if (valid > tval)
4329 valid -= tval;
4330 else
4331 valid = 0;
4332 }
1da177e4
LT		 4333 }
4334 } else {
85486af0
TG		 4335 preferred = INFINITY_LIFE_TIME;
4336 valid = INFINITY_LIFE_TIME;
4337 }
4338
7996c799 4339 if (!ipv6_addr_any(&ifa->peer_addr)) {
930345ea
JB		 4340 if (nla_put_in6_addr(skb, IFA_LOCAL, &ifa->addr) < 0 ||
4341 nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->peer_addr) < 0)
caeaba79
ND		 4342 goto error;
4343 } else
930345ea 4344 if (nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->addr) < 0)
caeaba79
ND		 4345 goto error;
4346
4347 if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0)
4348 goto error;
1da177e4 4349
479840ff
JP		 4350 if (nla_put_u32(skb, IFA_FLAGS, ifa->flags) < 0)
4351 goto error;
4352
053c095a
JB		 4353 nlmsg_end(skb, nlh);
4354 return 0;
caeaba79
ND		 4355
4356error:
4357 nlmsg_cancel(skb, nlh);
4358 return -EMSGSIZE;
1da177e4
LT		 4359}
4360
4361static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
15e47304 4362 u32 portid, u32 seq, int event, u16 flags)
1da177e4 4363{
1da177e4 4364 struct nlmsghdr *nlh;
101bb229
TG		 4365 u8 scope = RT_SCOPE_UNIVERSE;
4366 int ifindex = ifmca->idev->dev->ifindex;
4367
4368 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
4369 scope = RT_SCOPE_SITE;
1da177e4 4370
15e47304 4371 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
63159f29 4372 if (!nlh)
26932566 4373 return -EMSGSIZE;
85486af0 4374
0ab6803b 4375 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
930345ea 4376 if (nla_put_in6_addr(skb, IFA_MULTICAST, &ifmca->mca_addr) < 0 ||
0ab6803b 4377 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
26932566
PM		 4378 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
4379 nlmsg_cancel(skb, nlh);
4380 return -EMSGSIZE;
4381 }
85486af0 4382
053c095a
JB		 4383 nlmsg_end(skb, nlh);
4384 return 0;
1da177e4
LT		 4385}
4386
4387static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
15e47304 4388 u32 portid, u32 seq, int event, unsigned int flags)
1da177e4 4389{
1da177e4 4390 struct nlmsghdr *nlh;
101bb229
TG		 4391 u8 scope = RT_SCOPE_UNIVERSE;
4392 int ifindex = ifaca->aca_idev->dev->ifindex;
4393
4394 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
4395 scope = RT_SCOPE_SITE;
1da177e4 4396
15e47304 4397 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
63159f29 4398 if (!nlh)
26932566 4399 return -EMSGSIZE;
85486af0 4400
0ab6803b 4401 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
930345ea 4402 if (nla_put_in6_addr(skb, IFA_ANYCAST, &ifaca->aca_addr) < 0 ||
0ab6803b 4403 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
26932566
PM		 4404 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
4405 nlmsg_cancel(skb, nlh);
4406 return -EMSGSIZE;
4407 }
1da177e4 4408
053c095a
JB		 4409 nlmsg_end(skb, nlh);
4410 return 0;
1da177e4
LT		 4411}
4412
e21e8467 4413enum addr_type_t {
1da177e4
LT		 4414 UNICAST_ADDR,
4415 MULTICAST_ADDR,
4416 ANYCAST_ADDR,
4417};
4418
234b27c3
ED		 4419/* called with rcu_read_lock() */
4420static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
4421 struct netlink_callback *cb, enum addr_type_t type,
4422 int s_ip_idx, int *p_ip_idx)
4423{
234b27c3
ED		 4424 struct ifmcaddr6 *ifmca;
4425 struct ifacaddr6 *ifaca;
4426 int err = 1;
4427 int ip_idx = *p_ip_idx;
4428
4429 read_lock_bh(&idev->lock);
4430 switch (type) {
502a2ffd 4431 case UNICAST_ADDR: {
4432 struct inet6_ifaddr *ifa;
4433
234b27c3 4434 /* unicast address incl. temp addr */
502a2ffd 4435 list_for_each_entry(ifa, &idev->addr_list, if_list) {
4436 if (++ip_idx < s_ip_idx)
234b27c3
ED		 4437 continue;
4438 err = inet6_fill_ifaddr(skb, ifa,
15e47304 4439 NETLINK_CB(cb->skb).portid,
234b27c3
ED		 4440 cb->nlh->nlmsg_seq,
4441 RTM_NEWADDR,
4442 NLM_F_MULTI);
053c095a 4443 if (err < 0)
234b27c3 4444 break;
63998ac2 4445 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
234b27c3
ED		 4446 }
4447 break;
502a2ffd 4448 }
234b27c3
ED		 4449 case MULTICAST_ADDR:
4450 /* multicast address */
4451 for (ifmca = idev->mc_list; ifmca;
4452 ifmca = ifmca->next, ip_idx++) {
4453 if (ip_idx < s_ip_idx)
4454 continue;
4455 err = inet6_fill_ifmcaddr(skb, ifmca,
15e47304 4456 NETLINK_CB(cb->skb).portid,
234b27c3
ED		 4457 cb->nlh->nlmsg_seq,
4458 RTM_GETMULTICAST,
4459 NLM_F_MULTI);
053c095a 4460 if (err < 0)
234b27c3
ED		 4461 break;
4462 }
4463 break;
4464 case ANYCAST_ADDR:
4465 /* anycast address */
4466 for (ifaca = idev->ac_list; ifaca;
4467 ifaca = ifaca->aca_next, ip_idx++) {
4468 if (ip_idx < s_ip_idx)
4469 continue;
4470 err = inet6_fill_ifacaddr(skb, ifaca,
15e47304 4471 NETLINK_CB(cb->skb).portid,
234b27c3
ED		 4472 cb->nlh->nlmsg_seq,
4473 RTM_GETANYCAST,
4474 NLM_F_MULTI);
053c095a 4475 if (err < 0)
234b27c3
ED		 4476 break;
4477 }
4478 break;
4479 default:
4480 break;
4481 }
4482 read_unlock_bh(&idev->lock);
4483 *p_ip_idx = ip_idx;
4484 return err;
4485}
4486
1da177e4
LT		 4487static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
4488 enum addr_type_t type)
4489{
234b27c3
ED		 4490 struct net *net = sock_net(skb->sk);
4491 int h, s_h;
1da177e4
LT		 4492 int idx, ip_idx;
4493 int s_idx, s_ip_idx;
1da177e4 4494 struct net_device *dev;
234b27c3
ED		 4495 struct inet6_dev *idev;
4496 struct hlist_head *head;
1ab1457c 4497
234b27c3
ED		 4498 s_h = cb->args[0];
4499 s_idx = idx = cb->args[1];
4500 s_ip_idx = ip_idx = cb->args[2];
5d5619b4 4501
234b27c3 4502 rcu_read_lock();
63998ac2 4503 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ net->dev_base_seq;
234b27c3
ED		 4504 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4505 idx = 0;
4506 head = &net->dev_index_head[h];
b67bfe0d 4507 hlist_for_each_entry_rcu(dev, head, index_hlist) {
234b27c3
ED		 4508 if (idx < s_idx)
4509 goto cont;
4b97efdf 4510 if (h > s_h || idx > s_idx)
234b27c3
ED		 4511 s_ip_idx = 0;
4512 ip_idx = 0;
e21e8467
SH		 4513 idev = __in6_dev_get(dev);
4514 if (!idev)
234b27c3
ED		 4515 goto cont;
4516
4517 if (in6_dump_addrs(idev, skb, cb, type,
7b46a644 4518 s_ip_idx, &ip_idx) < 0)
234b27c3 4519 goto done;
7562f876 4520cont:
234b27c3
ED		 4521 idx++;
4522 }
1da177e4 4523 }
234b27c3
ED		 4524done:
4525 rcu_read_unlock();
4526 cb->args[0] = h;
4527 cb->args[1] = idx;
4528 cb->args[2] = ip_idx;
4529
1da177e4
LT		 4530 return skb->len;
4531}
4532
4533static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
4534{
4535 enum addr_type_t type = UNICAST_ADDR;
b854272b 4536
1da177e4
LT		 4537 return inet6_dump_addr(skb, cb, type);
4538}
4539
4540static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
4541{
4542 enum addr_type_t type = MULTICAST_ADDR;
b854272b 4543
1da177e4
LT		 4544 return inet6_dump_addr(skb, cb, type);
4545}
4546
4547
4548static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
4549{
4550 enum addr_type_t type = ANYCAST_ADDR;
b854272b 4551
1da177e4
LT		 4552 return inet6_dump_addr(skb, cb, type);
4553}
4554
661d2967 4555static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh)
6c223828 4556{
3b1e0a65 4557 struct net *net = sock_net(in_skb->sk);
1b29fc2c
TG		 4558 struct ifaddrmsg *ifm;
4559 struct nlattr *tb[IFA_MAX+1];
caeaba79 4560 struct in6_addr *addr = NULL, *peer;
6c223828
NT		 4561 struct net_device *dev = NULL;
4562 struct inet6_ifaddr *ifa;
4563 struct sk_buff *skb;
6c223828
NT		 4564 int err;
4565
1b29fc2c
TG		 4566 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
4567 if (err < 0)
4568 goto errout;
4569
caeaba79 4570 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer);
63159f29 4571 if (!addr) {
1b29fc2c
TG		 4572 err = -EINVAL;
4573 goto errout;
6c223828 4574 }
6c223828 4575
1b29fc2c 4576 ifm = nlmsg_data(nlh);
6c223828 4577 if (ifm->ifa_index)
6fda7350 4578 dev = __dev_get_by_index(net, ifm->ifa_index);
6c223828 4579
e21e8467
SH		 4580 ifa = ipv6_get_ifaddr(net, addr, dev, 1);
4581 if (!ifa) {
1b29fc2c
TG		 4582 err = -EADDRNOTAVAIL;
4583 goto errout;
4584 }
6c223828 4585
e21e8467
SH		 4586 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
4587 if (!skb) {
6c223828 4588 err = -ENOBUFS;
1b29fc2c 4589 goto errout_ifa;
6c223828
NT		 4590 }
4591
15e47304 4592 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).portid,
6c223828 4593 nlh->nlmsg_seq, RTM_NEWADDR, 0);
26932566
PM		 4594 if (err < 0) {
4595 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4596 WARN_ON(err == -EMSGSIZE);
4597 kfree_skb(skb);
4598 goto errout_ifa;
4599 }
15e47304 4600 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
1b29fc2c 4601errout_ifa:
6c223828 4602 in6_ifa_put(ifa);
1b29fc2c 4603errout:
6c223828 4604 return err;
6c223828
NT		 4605}
4606
1da177e4
LT		 4607static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
4608{
4609 struct sk_buff *skb;
c346dca1 4610 struct net *net = dev_net(ifa->idev->dev);
5d620266 4611 int err = -ENOBUFS;
1da177e4 4612
0ab6803b 4613 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
63159f29 4614 if (!skb)
5d620266
TG		 4615 goto errout;
4616
4617 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 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;
4623 }
1ce85fe4
PNA		 4624 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
4625 return;
5d620266
TG		 4626errout:
4627 if (err < 0)
6fda7350 4628 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
1da177e4
LT		 4629}
4630
b6f99a21 4631static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
1da177e4
LT		 4632 __s32 *array, int bytes)
4633{
04561c1f
TG		 4634 BUG_ON(bytes < (DEVCONF_MAX * 4));
4635
1da177e4
LT		 4636 memset(array, 0, bytes);
4637 array[DEVCONF_FORWARDING] = cnf->forwarding;
4638 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
4639 array[DEVCONF_MTU6] = cnf->mtu6;
4640 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
4641 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
4642 array[DEVCONF_AUTOCONF] = cnf->autoconf;
4643 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
4644 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
93908d19
TG		 4645 array[DEVCONF_RTR_SOLICIT_INTERVAL] =
4646 jiffies_to_msecs(cnf->rtr_solicit_interval);
4647 array[DEVCONF_RTR_SOLICIT_DELAY] =
4648 jiffies_to_msecs(cnf->rtr_solicit_delay);
1da177e4 4649 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
fc4eba58
HFS		 4650 array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] =
4651 jiffies_to_msecs(cnf->mldv1_unsolicited_report_interval);
4652 array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] =
4653 jiffies_to_msecs(cnf->mldv2_unsolicited_report_interval);
1da177e4
LT		 4654 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
4655 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
4656 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
4657 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
4658 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
1da177e4 4659 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
65f5c7c1 4660 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
8013d1d7 4661 array[DEVCONF_ACCEPT_RA_MIN_HOP_LIMIT] = cnf->accept_ra_min_hop_limit;
c4fd30eb 4662 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
930d6ff2
YH		 4663#ifdef CONFIG_IPV6_ROUTER_PREF
4664 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
93908d19
TG		 4665 array[DEVCONF_RTR_PROBE_INTERVAL] =
4666 jiffies_to_msecs(cnf->rtr_probe_interval);
fa03ef38 4667#ifdef CONFIG_IPV6_ROUTE_INFO
09c884d4
YH		 4668 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
4669#endif
930d6ff2 4670#endif
fbea49e1 4671 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
0bcbc926 4672 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
95c385b4
NH		 4673#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4674 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
7fd2561e 4675 array[DEVCONF_USE_OPTIMISTIC] = cnf->use_optimistic;
95c385b4 4676#endif
7bc570c8
YH		 4677#ifdef CONFIG_IPV6_MROUTE
4678 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
4679#endif
778d80be 4680 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
1b34be74 4681 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
c3faca05 4682 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
5cb04436 4683 array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify;
b800c3b9 4684 array[DEVCONF_SUPPRESS_FRAG_NDISC] = cnf->suppress_frag_ndisc;
d9333196 4685 array[DEVCONF_ACCEPT_RA_FROM_LOCAL] = cnf->accept_ra_from_local;
c2943f14 4686 array[DEVCONF_ACCEPT_RA_MTU] = cnf->accept_ra_mtu;
35103d11 4687 array[DEVCONF_IGNORE_ROUTES_WITH_LINKDOWN] = cnf->ignore_routes_with_linkdown;
3d1bec99 4688 /* we omit DEVCONF_STABLE_SECRET for now */
3985e8a3 4689 array[DEVCONF_USE_OIF_ADDRS_ONLY] = cnf->use_oif_addrs_only;
1da177e4
LT		 4690}
4691
b382b191
TG		 4692static inline size_t inet6_ifla6_size(void)
4693{
4694 return nla_total_size(4) /* IFLA_INET6_FLAGS */
4695 + nla_total_size(sizeof(struct ifla_cacheinfo))
4696 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
4697 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
f53adae4
DB		 4698 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
4699 + nla_total_size(sizeof(struct in6_addr)); /* IFLA_INET6_TOKEN */
b382b191
TG		 4700}
4701
339bf98f
TG		 4702static inline size_t inet6_if_nlmsg_size(void)
4703{
4704 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
4705 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
4706 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
4707 + nla_total_size(4) /* IFLA_MTU */
4708 + nla_total_size(4) /* IFLA_LINK */
0344338b 4709 + nla_total_size(1) /* IFLA_OPERSTATE */
b382b191 4710 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */
339bf98f 4711}
c5396a31 4712
be281e55 4713static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib,
7d720c3e 4714 int items, int bytes)
7f7d9a6b
HX		 4715{
4716 int i;
4717 int pad = bytes - sizeof(u64) * items;
4718 BUG_ON(pad < 0);
4719
4720 /* Use put_unaligned() because stats may not be aligned for u64. */
4721 put_unaligned(items, &stats[0]);
4722 for (i = 1; i < items; i++)
be281e55 4723 put_unaligned(atomic_long_read(&mib[i]), &stats[i]);
7f7d9a6b
HX		 4724
4725 memset(&stats[items], 0, pad);
4726}
4727
698365fa 4728static inline void __snmp6_fill_stats64(u64 *stats, void __percpu *mib,
a3a77372 4729 int bytes, size_t syncpoff)
4ce3c183 4730{
a3a77372
R		 4731 int i, c;
4732 u64 buff[IPSTATS_MIB_MAX];
4733 int pad = bytes - sizeof(u64) * IPSTATS_MIB_MAX;
4734
4ce3c183
ED		 4735 BUG_ON(pad < 0);
4736
a3a77372
R		 4737 memset(buff, 0, sizeof(buff));
4738 buff[0] = IPSTATS_MIB_MAX;
4ce3c183 4739
a3a77372
R		 4740 for_each_possible_cpu(c) {
4741 for (i = 1; i < IPSTATS_MIB_MAX; i++)
4742 buff[i] += snmp_get_cpu_field64(mib, c, i, syncpoff);
4743 }
4744
4745 memcpy(stats, buff, IPSTATS_MIB_MAX * sizeof(u64));
4746 memset(&stats[IPSTATS_MIB_MAX], 0, pad);
4ce3c183
ED		 4747}
4748
7f7d9a6b
HX		 4749static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
4750 int bytes)
4751{
e21e8467 4752 switch (attrtype) {
7f7d9a6b 4753 case IFLA_INET6_STATS:
a3a77372
R		 4754 __snmp6_fill_stats64(stats, idev->stats.ipv6, bytes,
4755 offsetof(struct ipstats_mib, syncp));
7f7d9a6b
HX		 4756 break;
4757 case IFLA_INET6_ICMP6STATS:
be281e55 4758 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, ICMP6_MIB_MAX, bytes);
7f7d9a6b
HX		 4759 break;
4760 }
4761}
4762
b382b191
TG		 4763static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev)
4764{
4765 struct nlattr *nla;
4766 struct ifla_cacheinfo ci;
4767
c78679e8
DM		 4768 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags))
4769 goto nla_put_failure;
b382b191 4770 ci.max_reasm_len = IPV6_MAXPLEN;
24912420
DM		 4771 ci.tstamp = cstamp_delta(idev->tstamp);
4772 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time);
1f9248e5 4773 ci.retrans_time = jiffies_to_msecs(NEIGH_VAR(idev->nd_parms, RETRANS_TIME));
c78679e8
DM		 4774 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci))
4775 goto nla_put_failure;
b382b191 4776 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
63159f29 4777 if (!nla)
b382b191
TG		 4778 goto nla_put_failure;
4779 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
4780
4781 /* XXX - MC not implemented */
4782
4783 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
63159f29 4784 if (!nla)
b382b191
TG		 4785 goto nla_put_failure;
4786 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
4787
4788 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
63159f29 4789 if (!nla)
b382b191
TG		 4790 goto nla_put_failure;
4791 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
4792
f53adae4 4793 nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr));
63159f29 4794 if (!nla)
f53adae4 4795 goto nla_put_failure;
bc91b0f0
JP		 4796
4797 if (nla_put_u8(skb, IFLA_INET6_ADDR_GEN_MODE, idev->addr_gen_mode))
4798 goto nla_put_failure;
4799
f53adae4
DB		 4800 read_lock_bh(&idev->lock);
4801 memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla));
4802 read_unlock_bh(&idev->lock);
4803
b382b191
TG		 4804 return 0;
4805
4806nla_put_failure:
4807 return -EMSGSIZE;
4808}
4809
4810static size_t inet6_get_link_af_size(const struct net_device *dev)
4811{
4812 if (!__in6_dev_get(dev))
4813 return 0;
4814
4815 return inet6_ifla6_size();
4816}
4817
4818static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev)
4819{
4820 struct inet6_dev *idev = __in6_dev_get(dev);
4821
4822 if (!idev)
4823 return -ENODATA;
4824
4825 if (inet6_fill_ifla6_attrs(skb, idev) < 0)
4826 return -EMSGSIZE;
4827
4828 return 0;
4829}
4830
f53adae4
DB		 4831static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token)
4832{
f53adae4
DB		 4833 struct inet6_ifaddr *ifp;
4834 struct net_device *dev = idev->dev;
fc403832 4835 bool update_rs = false;
dc848292 4836 struct in6_addr ll_addr;
f53adae4 4837
c15b1cca
HFS		 4838 ASSERT_RTNL();
4839
63159f29 4840 if (!token)
f53adae4
DB		 4841 return -EINVAL;
4842 if (ipv6_addr_any(token))
4843 return -EINVAL;
4844 if (dev->flags & (IFF_LOOPBACK | IFF_NOARP))
4845 return -EINVAL;
f53adae4
DB		 4846 if (!ipv6_accept_ra(idev))
4847 return -EINVAL;
4848 if (idev->cnf.rtr_solicits <= 0)
4849 return -EINVAL;
4850
4851 write_lock_bh(&idev->lock);
4852
4853 BUILD_BUG_ON(sizeof(token->s6_addr) != 16);
4854 memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8);
4855
4856 write_unlock_bh(&idev->lock);
4857
dc848292
HFS		 4858 if (!idev->dead && (idev->if_flags & IF_READY) &&
4859 !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE |
4860 IFA_F_OPTIMISTIC)) {
fc403832
DB		 4861
4862 /* If we're not ready, then normal ifup will take care
4863 * of this. Otherwise, we need to request our rs here.
4864 */
4865 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters);
4866 update_rs = true;
4867 }
f53adae4
DB		 4868
4869 write_lock_bh(&idev->lock);
fc403832 4870
77ecaace 4871 if (update_rs) {
fc403832 4872 idev->if_flags |= IF_RS_SENT;
77ecaace
HFS		 4873 idev->rs_probes = 1;
4874 addrconf_mod_rs_timer(idev, idev->cnf.rtr_solicit_interval);
4875 }
f53adae4
DB		 4876
4877 /* Well, that's kinda nasty ... */
4878 list_for_each_entry(ifp, &idev->addr_list, if_list) {
4879 spin_lock(&ifp->lock);
617fe29d 4880 if (ifp->tokenized) {
f53adae4
DB		 4881 ifp->valid_lft = 0;
4882 ifp->prefered_lft = 0;
4883 }
4884 spin_unlock(&ifp->lock);
4885 }
4886
4887 write_unlock_bh(&idev->lock);
b2ed64a9 4888 inet6_ifinfo_notify(RTM_NEWLINK, idev);
c15b1cca 4889 addrconf_verify_rtnl();
f53adae4
DB		 4890 return 0;
4891}
4892
11b1f828
DB		 4893static const struct nla_policy inet6_af_policy[IFLA_INET6_MAX + 1] = {
4894 [IFLA_INET6_ADDR_GEN_MODE] = { .type = NLA_U8 },
4895 [IFLA_INET6_TOKEN] = { .len = sizeof(struct in6_addr) },
4896};
4897
4898static int inet6_validate_link_af(const struct net_device *dev,
4899 const struct nlattr *nla)
4900{
4901 struct nlattr *tb[IFLA_INET6_MAX + 1];
4902
4903 if (dev && !__in6_dev_get(dev))
4904 return -EAFNOSUPPORT;
4905
4906 return nla_parse_nested(tb, IFLA_INET6_MAX, nla, inet6_af_policy);
4907}
4908
f53adae4
DB		 4909static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla)
4910{
4911 int err = -EINVAL;
4912 struct inet6_dev *idev = __in6_dev_get(dev);
4913 struct nlattr *tb[IFLA_INET6_MAX + 1];
4914
4915 if (!idev)
4916 return -EAFNOSUPPORT;
4917
4918 if (nla_parse_nested(tb, IFLA_INET6_MAX, nla, NULL) < 0)
4919 BUG();
4920
bc91b0f0 4921 if (tb[IFLA_INET6_TOKEN]) {
f53adae4 4922 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN]));
bc91b0f0
JP		 4923 if (err)
4924 return err;
4925 }
4926
4927 if (tb[IFLA_INET6_ADDR_GEN_MODE]) {
4928 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]);
4929
4930 if (mode != IN6_ADDR_GEN_MODE_EUI64 &&
622c81d5
HFS		 4931 mode != IN6_ADDR_GEN_MODE_NONE &&
4932 mode != IN6_ADDR_GEN_MODE_STABLE_PRIVACY)
4933 return -EINVAL;
4934
4935 if (mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
4936 !idev->cnf.stable_secret.initialized &&
4937 !dev_net(dev)->ipv6.devconf_dflt->stable_secret.initialized)
bc91b0f0 4938 return -EINVAL;
622c81d5 4939
bc91b0f0
JP		 4940 idev->addr_gen_mode = mode;
4941 err = 0;
4942 }
f53adae4
DB		 4943
4944 return err;
4945}
4946
1ab1457c 4947static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
15e47304 4948 u32 portid, u32 seq, int event, unsigned int flags)
1da177e4 4949{
04561c1f 4950 struct net_device *dev = idev->dev;
04561c1f
TG		 4951 struct ifinfomsg *hdr;
4952 struct nlmsghdr *nlh;
4953 void *protoinfo;
04561c1f 4954
15e47304 4955 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags);
63159f29 4956 if (!nlh)
26932566 4957 return -EMSGSIZE;
04561c1f
TG		 4958
4959 hdr = nlmsg_data(nlh);
4960 hdr->ifi_family = AF_INET6;
4961 hdr->__ifi_pad = 0;
4962 hdr->ifi_type = dev->type;
4963 hdr->ifi_index = dev->ifindex;
4964 hdr->ifi_flags = dev_get_flags(dev);
4965 hdr->ifi_change = 0;
4966
c78679e8
DM		 4967 if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
4968 (dev->addr_len &&
4969 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
4970 nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
a54acb3a 4971 (dev->ifindex != dev_get_iflink(dev) &&
0344338b
AG		 4972 nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))) ||
4973 nla_put_u8(skb, IFLA_OPERSTATE,
4974 netif_running(dev) ? dev->operstate : IF_OPER_DOWN))
c78679e8 4975 goto nla_put_failure;
04561c1f 4976 protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
63159f29 4977 if (!protoinfo)
04561c1f 4978 goto nla_put_failure;
1da177e4 4979
b382b191 4980 if (inet6_fill_ifla6_attrs(skb, idev) < 0)
bf99f1bd 4981 goto nla_put_failure;
1da177e4 4982
04561c1f 4983 nla_nest_end(skb, protoinfo);
053c095a
JB		 4984 nlmsg_end(skb, nlh);
4985 return 0;
1da177e4 4986
04561c1f 4987nla_put_failure:
26932566
PM		 4988 nlmsg_cancel(skb, nlh);
4989 return -EMSGSIZE;
1da177e4
LT		 4990}
4991
4992static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
4993{
3b1e0a65 4994 struct net *net = sock_net(skb->sk);
84d2697d 4995 int h, s_h;
434a8a58 4996 int idx = 0, s_idx;
1da177e4
LT		 4997 struct net_device *dev;
4998 struct inet6_dev *idev;
84d2697d 4999 struct hlist_head *head;
1da177e4 5000
84d2697d
ED		 5001 s_h = cb->args[0];
5002 s_idx = cb->args[1];
5003
5004 rcu_read_lock();
5005 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
5006 idx = 0;
5007 head = &net->dev_index_head[h];
b67bfe0d 5008 hlist_for_each_entry_rcu(dev, head, index_hlist) {
84d2697d
ED		 5009 if (idx < s_idx)
5010 goto cont;
5011 idev = __in6_dev_get(dev);
5012 if (!idev)
5013 goto cont;
5014 if (inet6_fill_ifinfo(skb, idev,
15e47304 5015 NETLINK_CB(cb->skb).portid,
84d2697d 5016 cb->nlh->nlmsg_seq,
053c095a 5017 RTM_NEWLINK, NLM_F_MULTI) < 0)
84d2697d 5018 goto out;
7562f876 5019cont:
84d2697d
ED		 5020 idx++;
5021 }
1da177e4 5022 }
84d2697d
ED		 5023out:
5024 rcu_read_unlock();
5025 cb->args[1] = idx;
5026 cb->args[0] = h;
1da177e4
LT		 5027
5028 return skb->len;
5029}
5030
5031void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
5032{
5033 struct sk_buff *skb;
c346dca1 5034 struct net *net = dev_net(idev->dev);
8d7a76c9 5035 int err = -ENOBUFS;
1ab1457c 5036
339bf98f 5037 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
63159f29 5038 if (!skb)
8d7a76c9
TG		 5039 goto errout;
5040
5041 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
26932566
PM		 5042 if (err < 0) {
5043 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
5044 WARN_ON(err == -EMSGSIZE);
5045 kfree_skb(skb);
5046 goto errout;
5047 }
5f75a104 5048 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC);
1ce85fe4 5049 return;
8d7a76c9
TG		 5050errout:
5051 if (err < 0)
5f75a104 5052 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err);
1da177e4
LT		 5053}
5054
339bf98f
TG		 5055static inline size_t inet6_prefix_nlmsg_size(void)
5056{
5057 return NLMSG_ALIGN(sizeof(struct prefixmsg))
5058 + nla_total_size(sizeof(struct in6_addr))
5059 + nla_total_size(sizeof(struct prefix_cacheinfo));
5060}
c5396a31 5061
1da177e4 5062static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
15e47304 5063 struct prefix_info *pinfo, u32 portid, u32 seq,
6051e2f4 5064 int event, unsigned int flags)
1da177e4 5065{
6051e2f4
TG		 5066 struct prefixmsg *pmsg;
5067 struct nlmsghdr *nlh;
1da177e4
LT		 5068 struct prefix_cacheinfo ci;
5069
15e47304 5070 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags);
63159f29 5071 if (!nlh)
26932566 5072 return -EMSGSIZE;
6051e2f4
TG		 5073
5074 pmsg = nlmsg_data(nlh);
1da177e4 5075 pmsg->prefix_family = AF_INET6;
8a47077a
PM		 5076 pmsg->prefix_pad1 = 0;
5077 pmsg->prefix_pad2 = 0;
1da177e4
LT		 5078 pmsg->prefix_ifindex = idev->dev->ifindex;
5079 pmsg->prefix_len = pinfo->prefix_len;
5080 pmsg->prefix_type = pinfo->type;
8a47077a 5081 pmsg->prefix_pad3 = 0;
1da177e4
LT		 5082 pmsg->prefix_flags = 0;
5083 if (pinfo->onlink)
5084 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
5085 if (pinfo->autoconf)
5086 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
5087
c78679e8
DM		 5088 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix))
5089 goto nla_put_failure;
1da177e4
LT		 5090 ci.preferred_time = ntohl(pinfo->prefered);
5091 ci.valid_time = ntohl(pinfo->valid);
c78679e8
DM		 5092 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci))
5093 goto nla_put_failure;
053c095a
JB		 5094 nlmsg_end(skb, nlh);
5095 return 0;
1da177e4 5096
6051e2f4 5097nla_put_failure:
26932566
PM		 5098 nlmsg_cancel(skb, nlh);
5099 return -EMSGSIZE;
1da177e4
LT		 5100}
5101
1ab1457c 5102static void inet6_prefix_notify(int event, struct inet6_dev *idev,
1da177e4
LT		 5103 struct prefix_info *pinfo)
5104{
5105 struct sk_buff *skb;
c346dca1 5106 struct net *net = dev_net(idev->dev);
8c384bfa 5107 int err = -ENOBUFS;
1da177e4 5108
339bf98f 5109 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
63159f29 5110 if (!skb)
8c384bfa
TG		 5111 goto errout;
5112
5113 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
26932566
PM		 5114 if (err < 0) {
5115 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
5116 WARN_ON(err == -EMSGSIZE);
5117 kfree_skb(skb);
5118 goto errout;
5119 }
1ce85fe4
PNA		 5120 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
5121 return;
8c384bfa
TG		 5122errout:
5123 if (err < 0)
6fda7350 5124 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
1da177e4
LT		 5125}
5126
1da177e4
LT		 5127static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
5128{
63998ac2
ND		 5129 struct net *net = dev_net(ifp->idev->dev);
5130
c15b1cca
HFS		 5131 if (event)
5132 ASSERT_RTNL();
5133
1da177e4
LT		 5134 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
5135
5136 switch (event) {
5137 case RTM_NEWADDR:
95c385b4
NH		 5138 /*
5139 * If the address was optimistic
5140 * we inserted the route at the start of
5141 * our DAD process, so we don't need
5142 * to do it again
5143 */
5144 if (!(ifp->rt->rt6i_node))
5145 ip6_ins_rt(ifp->rt);
1da177e4
LT		 5146 if (ifp->idev->cnf.forwarding)
5147 addrconf_join_anycast(ifp);
7996c799 5148 if (!ipv6_addr_any(&ifp->peer_addr))
caeaba79
ND		 5149 addrconf_prefix_route(&ifp->peer_addr, 128,
5150 ifp->idev->dev, 0, 0);
1da177e4
LT		 5151 break;
5152 case RTM_DELADDR:
5153 if (ifp->idev->cnf.forwarding)
5154 addrconf_leave_anycast(ifp);
5155 addrconf_leave_solict(ifp->idev, &ifp->addr);
7996c799 5156 if (!ipv6_addr_any(&ifp->peer_addr)) {
caeaba79 5157 struct rt6_info *rt;
caeaba79 5158
e7478dfc
ND		 5159 rt = addrconf_get_prefix_route(&ifp->peer_addr, 128,
5160 ifp->idev->dev, 0, 0);
f24062b0
ND		 5161 if (rt && ip6_del_rt(rt))
5162 dst_free(&rt->dst);
caeaba79 5163 }
d8d1f30b 5164 dst_hold(&ifp->rt->dst);
93fa159a 5165
73a8bd74 5166 if (ip6_del_rt(ifp->rt))
d8d1f30b 5167 dst_free(&ifp->rt->dst);
705f1c86
HFS		 5168
5169 rt_genid_bump_ipv6(net);
1da177e4
LT		 5170 break;
5171 }
63998ac2 5172 atomic_inc(&net->ipv6.dev_addr_genid);
1da177e4
LT		 5173}
5174
5175static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
5176{
8814c4b5 5177 rcu_read_lock_bh();
1da177e4
LT		 5178 if (likely(ifp->idev->dead == 0))
5179 __ipv6_ifa_notify(event, ifp);
8814c4b5 5180 rcu_read_unlock_bh();
1da177e4
LT		 5181}
5182
5183#ifdef CONFIG_SYSCTL
5184
5185static
fe2c6338 5186int addrconf_sysctl_forward(struct ctl_table *ctl, int write,
1da177e4
LT		 5187 void __user *buffer, size_t *lenp, loff_t *ppos)
5188{
5189 int *valp = ctl->data;
5190 int val = *valp;
88af182e 5191 loff_t pos = *ppos;
fe2c6338 5192 struct ctl_table lctl;
1da177e4
LT		 5193 int ret;
5194
013d97e9
FR		 5195 /*
5196 * ctl->data points to idev->cnf.forwarding, we should
5197 * not modify it until we get the rtnl lock.
5198 */
5199 lctl = *ctl;
5200 lctl.data = &val;
5201
5202 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
1da177e4 5203
c8fecf22 5204 if (write)
b325fddb 5205 ret = addrconf_fixup_forwarding(ctl, valp, val);
88af182e
EB		 5206 if (ret)
5207 *ppos = pos;
1ab1457c 5208 return ret;
1da177e4
LT		 5209}
5210
77751427
ML		 5211static
5212int addrconf_sysctl_mtu(struct ctl_table *ctl, int write,
5213 void __user *buffer, size_t *lenp, loff_t *ppos)
5214{
5215 struct inet6_dev *idev = ctl->extra1;
5216 int min_mtu = IPV6_MIN_MTU;
5217 struct ctl_table lctl;
5218
5219 lctl = *ctl;
5220 lctl.extra1 = &min_mtu;
5221 lctl.extra2 = idev ? &idev->dev->mtu : NULL;
5222
5223 return proc_dointvec_minmax(&lctl, write, buffer, lenp, ppos);
5224}
5225
56d417b1
BH		 5226static void dev_disable_change(struct inet6_dev *idev)
5227{
75538c2b
CW		 5228 struct netdev_notifier_info info;
5229
56d417b1
BH		 5230 if (!idev || !idev->dev)
5231 return;
5232
75538c2b 5233 netdev_notifier_info_init(&info, idev->dev);
56d417b1 5234 if (idev->cnf.disable_ipv6)
75538c2b 5235 addrconf_notify(NULL, NETDEV_DOWN, &info);
56d417b1 5236 else
75538c2b 5237 addrconf_notify(NULL, NETDEV_UP, &info);
56d417b1
BH		 5238}
5239
5240static void addrconf_disable_change(struct net *net, __s32 newf)
5241{
5242 struct net_device *dev;
5243 struct inet6_dev *idev;
5244
c6d14c84
ED		 5245 rcu_read_lock();
5246 for_each_netdev_rcu(net, dev) {
56d417b1
BH		 5247 idev = __in6_dev_get(dev);
5248 if (idev) {
5249 int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
5250 idev->cnf.disable_ipv6 = newf;
5251 if (changed)
5252 dev_disable_change(idev);
5253 }
56d417b1 5254 }
c6d14c84 5255 rcu_read_unlock();
56d417b1
BH		 5256}
5257
013d97e9 5258static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf)
56d417b1
BH		 5259{
5260 struct net *net;
013d97e9
FR		 5261 int old;
5262
5263 if (!rtnl_trylock())
5264 return restart_syscall();
56d417b1
BH		 5265
5266 net = (struct net *)table->extra2;
013d97e9
FR		 5267 old = *p;
5268 *p = newf;
56d417b1 5269
013d97e9
FR		 5270 if (p == &net->ipv6.devconf_dflt->disable_ipv6) {
5271 rtnl_unlock();
56d417b1 5272 return 0;
88af182e 5273 }
56d417b1
BH		 5274
5275 if (p == &net->ipv6.devconf_all->disable_ipv6) {
56d417b1
BH		 5276 net->ipv6.devconf_dflt->disable_ipv6 = newf;
5277 addrconf_disable_change(net, newf);
013d97e9 5278 } else if ((!newf) ^ (!old))
56d417b1
BH		 5279 dev_disable_change((struct inet6_dev *)table->extra1);
5280
5281 rtnl_unlock();
5282 return 0;
5283}
5284
5285static
fe2c6338 5286int addrconf_sysctl_disable(struct ctl_table *ctl, int write,
56d417b1
BH		 5287 void __user *buffer, size_t *lenp, loff_t *ppos)
5288{
5289 int *valp = ctl->data;
5290 int val = *valp;
88af182e 5291 loff_t pos = *ppos;
fe2c6338 5292 struct ctl_table lctl;
56d417b1
BH		 5293 int ret;
5294
013d97e9
FR		 5295 /*
5296 * ctl->data points to idev->cnf.disable_ipv6, we should
5297 * not modify it until we get the rtnl lock.
5298 */
5299 lctl = *ctl;
5300 lctl.data = &val;
5301
5302 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
56d417b1
BH		 5303
5304 if (write)
5305 ret = addrconf_disable_ipv6(ctl, valp, val);
88af182e
EB		 5306 if (ret)
5307 *ppos = pos;
56d417b1
BH		 5308 return ret;
5309}
5310
c92d5491 5311static
5312int addrconf_sysctl_proxy_ndp(struct ctl_table *ctl, int write,
5313 void __user *buffer, size_t *lenp, loff_t *ppos)
5314{
5315 int *valp = ctl->data;
5316 int ret;
5317 int old, new;
5318
5319 old = *valp;
5320 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
5321 new = *valp;
5322
5323 if (write && old != new) {
5324 struct net *net = ctl->extra2;
5325
5326 if (!rtnl_trylock())
5327 return restart_syscall();
5328
5329 if (valp == &net->ipv6.devconf_dflt->proxy_ndp)
5330 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
5331 NETCONFA_IFINDEX_DEFAULT,
5332 net->ipv6.devconf_dflt);
5333 else if (valp == &net->ipv6.devconf_all->proxy_ndp)
5334 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
5335 NETCONFA_IFINDEX_ALL,
5336 net->ipv6.devconf_all);
5337 else {
5338 struct inet6_dev *idev = ctl->extra1;
5339
5340 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
5341 idev->dev->ifindex,
5342 &idev->cnf);
5343 }
5344 rtnl_unlock();
5345 }
5346
5347 return ret;
5348}
5349
3d1bec99
HFS		 5350static int addrconf_sysctl_stable_secret(struct ctl_table *ctl, int write,
5351 void __user *buffer, size_t *lenp,
5352 loff_t *ppos)
5353{
5354 int err;
5355 struct in6_addr addr;
5356 char str[IPV6_MAX_STRLEN];
5357 struct ctl_table lctl = *ctl;
622c81d5 5358 struct net *net = ctl->extra2;
3d1bec99
HFS		 5359 struct ipv6_stable_secret *secret = ctl->data;
5360
622c81d5
HFS		 5361 if (&net->ipv6.devconf_all->stable_secret == ctl->data)
5362 return -EIO;
5363
3d1bec99
HFS		 5364 lctl.maxlen = IPV6_MAX_STRLEN;
5365 lctl.data = str;
5366
5367 if (!rtnl_trylock())
5368 return restart_syscall();
5369
5370 if (!write && !secret->initialized) {
5371 err = -EIO;
5372 goto out;
5373 }
5374
5375 if (!write) {
5376 err = snprintf(str, sizeof(str), "%pI6",
5377 &secret->secret);
5378 if (err >= sizeof(str)) {
5379 err = -EIO;
5380 goto out;
5381 }
5382 }
5383
5384 err = proc_dostring(&lctl, write, buffer, lenp, ppos);
5385 if (err || !write)
5386 goto out;
5387
5388 if (in6_pton(str, -1, addr.in6_u.u6_addr8, -1, NULL) != 1) {
5389 err = -EIO;
5390 goto out;
5391 }
5392
5393 secret->initialized = true;
5394 secret->secret = addr;
5395
622c81d5
HFS		 5396 if (&net->ipv6.devconf_dflt->stable_secret == ctl->data) {
5397 struct net_device *dev;
5398
5399 for_each_netdev(net, dev) {
5400 struct inet6_dev *idev = __in6_dev_get(dev);
5401
5402 if (idev) {
5403 idev->addr_gen_mode =
5404 IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
5405 }
5406 }
5407 } else {
5408 struct inet6_dev *idev = ctl->extra1;
5409
5410 idev->addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
5411 }
5412
3d1bec99
HFS		 5413out:
5414 rtnl_unlock();
5415
5416 return err;
5417}
c92d5491 5418
35103d11
AG		 5419static
5420int addrconf_sysctl_ignore_routes_with_linkdown(struct ctl_table *ctl,
5421 int write,
5422 void __user *buffer,
5423 size_t *lenp,
5424 loff_t *ppos)
5425{
5426 int *valp = ctl->data;
5427 int val = *valp;
5428 loff_t pos = *ppos;
5429 struct ctl_table lctl;
5430 int ret;
5431
5432 /* ctl->data points to idev->cnf.ignore_routes_when_linkdown
5433 * we should not modify it until we get the rtnl lock.
5434 */
5435 lctl = *ctl;
5436 lctl.data = &val;
5437
5438 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
5439
5440 if (write)
5441 ret = addrconf_fixup_linkdown(ctl, valp, val);
5442 if (ret)
5443 *ppos = pos;
5444 return ret;
5445}
5446
1da177e4
LT		 5447static struct addrconf_sysctl_table
5448{
5449 struct ctl_table_header *sysctl_header;
fe2c6338 5450 struct ctl_table addrconf_vars[DEVCONF_MAX+1];
ab32ea5d 5451} addrconf_sysctl __read_mostly = {
1da177e4
LT		 5452 .sysctl_header = NULL,
5453 .addrconf_vars = {
1ab1457c 5454 {
e21e8467
SH		 5455 .procname = "forwarding",
5456 .data = &ipv6_devconf.forwarding,
5457 .maxlen = sizeof(int),
5458 .mode = 0644,
5459 .proc_handler = addrconf_sysctl_forward,
1da177e4
LT		 5460 },
5461 {
e21e8467
SH		 5462 .procname = "hop_limit",
5463 .data = &ipv6_devconf.hop_limit,
5464 .maxlen = sizeof(int),
5465 .mode = 0644,
5466 .proc_handler = proc_dointvec,
1da177e4
LT		 5467 },
5468 {
e21e8467
SH		 5469 .procname = "mtu",
5470 .data = &ipv6_devconf.mtu6,
5471 .maxlen = sizeof(int),
5472 .mode = 0644,
77751427 5473 .proc_handler = addrconf_sysctl_mtu,
1da177e4
LT		 5474 },
5475 {
e21e8467
SH		 5476 .procname = "accept_ra",
5477 .data = &ipv6_devconf.accept_ra,
5478 .maxlen = sizeof(int),
5479 .mode = 0644,
5480 .proc_handler = proc_dointvec,
1da177e4
LT		 5481 },
5482 {
e21e8467
SH		 5483 .procname = "accept_redirects",
5484 .data = &ipv6_devconf.accept_redirects,
5485 .maxlen = sizeof(int),
5486 .mode = 0644,
5487 .proc_handler = proc_dointvec,
1da177e4
LT		 5488 },
5489 {
e21e8467
SH		 5490 .procname = "autoconf",
5491 .data = &ipv6_devconf.autoconf,
5492 .maxlen = sizeof(int),
5493 .mode = 0644,
5494 .proc_handler = proc_dointvec,
1da177e4
LT		 5495 },
5496 {
e21e8467
SH		 5497 .procname = "dad_transmits",
5498 .data = &ipv6_devconf.dad_transmits,
5499 .maxlen = sizeof(int),
5500 .mode = 0644,
5501 .proc_handler = proc_dointvec,
1da177e4
LT		 5502 },
5503 {
e21e8467
SH		 5504 .procname = "router_solicitations",
5505 .data = &ipv6_devconf.rtr_solicits,
5506 .maxlen = sizeof(int),
5507 .mode = 0644,
5508 .proc_handler = proc_dointvec,
1da177e4
LT		 5509 },
5510 {
e21e8467
SH		 5511 .procname = "router_solicitation_interval",
5512 .data = &ipv6_devconf.rtr_solicit_interval,
5513 .maxlen = sizeof(int),
5514 .mode = 0644,
5515 .proc_handler = proc_dointvec_jiffies,
1da177e4
LT		 5516 },
5517 {
e21e8467
SH		 5518 .procname = "router_solicitation_delay",
5519 .data = &ipv6_devconf.rtr_solicit_delay,
5520 .maxlen = sizeof(int),
5521 .mode = 0644,
5522 .proc_handler = proc_dointvec_jiffies,
1da177e4
LT		 5523 },
5524 {
e21e8467
SH		 5525 .procname = "force_mld_version",
5526 .data = &ipv6_devconf.force_mld_version,
5527 .maxlen = sizeof(int),
5528 .mode = 0644,
5529 .proc_handler = proc_dointvec,
1da177e4 5530 },
fc4eba58
HFS		 5531 {
5532 .procname = "mldv1_unsolicited_report_interval",
5533 .data =
5534 &ipv6_devconf.mldv1_unsolicited_report_interval,
5535 .maxlen = sizeof(int),
5536 .mode = 0644,
5537 .proc_handler = proc_dointvec_ms_jiffies,
5538 },
5539 {
5540 .procname = "mldv2_unsolicited_report_interval",
5541 .data =
5542 &ipv6_devconf.mldv2_unsolicited_report_interval,
5543 .maxlen = sizeof(int),
5544 .mode = 0644,
5545 .proc_handler = proc_dointvec_ms_jiffies,
5546 },
1da177e4 5547 {
e21e8467
SH		 5548 .procname = "use_tempaddr",
5549 .data = &ipv6_devconf.use_tempaddr,
5550 .maxlen = sizeof(int),
5551 .mode = 0644,
5552 .proc_handler = proc_dointvec,
1da177e4
LT		 5553 },
5554 {
e21e8467
SH		 5555 .procname = "temp_valid_lft",
5556 .data = &ipv6_devconf.temp_valid_lft,
5557 .maxlen = sizeof(int),
5558 .mode = 0644,
5559 .proc_handler = proc_dointvec,
1da177e4
LT		 5560 },
5561 {
e21e8467
SH		 5562 .procname = "temp_prefered_lft",
5563 .data = &ipv6_devconf.temp_prefered_lft,
5564 .maxlen = sizeof(int),
5565 .mode = 0644,
5566 .proc_handler = proc_dointvec,
1da177e4
LT		 5567 },
5568 {
e21e8467
SH		 5569 .procname = "regen_max_retry",
5570 .data = &ipv6_devconf.regen_max_retry,
5571 .maxlen = sizeof(int),
5572 .mode = 0644,
5573 .proc_handler = proc_dointvec,
1da177e4
LT		 5574 },
5575 {
e21e8467
SH		 5576 .procname = "max_desync_factor",
5577 .data = &ipv6_devconf.max_desync_factor,
5578 .maxlen = sizeof(int),
5579 .mode = 0644,
5580 .proc_handler = proc_dointvec,
1da177e4 5581 },
1da177e4 5582 {
e21e8467
SH		 5583 .procname = "max_addresses",
5584 .data = &ipv6_devconf.max_addresses,
5585 .maxlen = sizeof(int),
5586 .mode = 0644,
5587 .proc_handler = proc_dointvec,
1da177e4 5588 },
65f5c7c1 5589 {
e21e8467
SH		 5590 .procname = "accept_ra_defrtr",
5591 .data = &ipv6_devconf.accept_ra_defrtr,
5592 .maxlen = sizeof(int),
5593 .mode = 0644,
5594 .proc_handler = proc_dointvec,
65f5c7c1 5595 },
8013d1d7
HL		 5596 {
5597 .procname = "accept_ra_min_hop_limit",
5598 .data = &ipv6_devconf.accept_ra_min_hop_limit,
5599 .maxlen = sizeof(int),
5600 .mode = 0644,
5601 .proc_handler = proc_dointvec,
5602 },
c4fd30eb 5603 {
e21e8467
SH		 5604 .procname = "accept_ra_pinfo",
5605 .data = &ipv6_devconf.accept_ra_pinfo,
5606 .maxlen = sizeof(int),
5607 .mode = 0644,
5608 .proc_handler = proc_dointvec,
c4fd30eb 5609 },
930d6ff2
YH		 5610#ifdef CONFIG_IPV6_ROUTER_PREF
5611 {
e21e8467
SH		 5612 .procname = "accept_ra_rtr_pref",
5613 .data = &ipv6_devconf.accept_ra_rtr_pref,
5614 .maxlen = sizeof(int),
5615 .mode = 0644,
5616 .proc_handler = proc_dointvec,
930d6ff2 5617 },
52e16356 5618 {
e21e8467
SH		 5619 .procname = "router_probe_interval",
5620 .data = &ipv6_devconf.rtr_probe_interval,
5621 .maxlen = sizeof(int),
5622 .mode = 0644,
5623 .proc_handler = proc_dointvec_jiffies,
52e16356 5624 },
fa03ef38 5625#ifdef CONFIG_IPV6_ROUTE_INFO
09c884d4 5626 {
e21e8467
SH		 5627 .procname = "accept_ra_rt_info_max_plen",
5628 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
5629 .maxlen = sizeof(int),
5630 .mode = 0644,
5631 .proc_handler = proc_dointvec,
09c884d4
YH		 5632 },
5633#endif
930d6ff2 5634#endif
fbea49e1 5635 {
e21e8467
SH		 5636 .procname = "proxy_ndp",
5637 .data = &ipv6_devconf.proxy_ndp,
5638 .maxlen = sizeof(int),
5639 .mode = 0644,
c92d5491 5640 .proc_handler = addrconf_sysctl_proxy_ndp,
fbea49e1 5641 },
0bcbc926 5642 {
e21e8467
SH		 5643 .procname = "accept_source_route",
5644 .data = &ipv6_devconf.accept_source_route,
5645 .maxlen = sizeof(int),
5646 .mode = 0644,
5647 .proc_handler = proc_dointvec,
0bcbc926 5648 },
95c385b4
NH		 5649#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
5650 {
e21e8467
SH		 5651 .procname = "optimistic_dad",
5652 .data = &ipv6_devconf.optimistic_dad,
5653 .maxlen = sizeof(int),
5654 .mode = 0644,
5655 .proc_handler = proc_dointvec,
95c385b4
NH		 5656
5657 },
7fd2561e
EK		 5658 {
5659 .procname = "use_optimistic",
5660 .data = &ipv6_devconf.use_optimistic,
5661 .maxlen = sizeof(int),
5662 .mode = 0644,
5663 .proc_handler = proc_dointvec,
5664
5665 },
7bc570c8
YH		 5666#endif
5667#ifdef CONFIG_IPV6_MROUTE
5668 {
e21e8467
SH		 5669 .procname = "mc_forwarding",
5670 .data = &ipv6_devconf.mc_forwarding,
5671 .maxlen = sizeof(int),
5672 .mode = 0444,
5673 .proc_handler = proc_dointvec,
7bc570c8 5674 },
95c385b4 5675#endif
778d80be 5676 {
e21e8467
SH		 5677 .procname = "disable_ipv6",
5678 .data = &ipv6_devconf.disable_ipv6,
5679 .maxlen = sizeof(int),
5680 .mode = 0644,
5681 .proc_handler = addrconf_sysctl_disable,
778d80be 5682 },
1b34be74 5683 {
e21e8467
SH		 5684 .procname = "accept_dad",
5685 .data = &ipv6_devconf.accept_dad,
5686 .maxlen = sizeof(int),
5687 .mode = 0644,
5688 .proc_handler = proc_dointvec,
1b34be74 5689 },
f7734fdf 5690 {
f7734fdf
OP		 5691 .procname = "force_tllao",
5692 .data = &ipv6_devconf.force_tllao,
5693 .maxlen = sizeof(int),
5694 .mode = 0644,
5695 .proc_handler = proc_dointvec
5696 },
5cb04436
HFS		 5697 {
5698 .procname = "ndisc_notify",
5699 .data = &ipv6_devconf.ndisc_notify,
5700 .maxlen = sizeof(int),
5701 .mode = 0644,
5702 .proc_handler = proc_dointvec
5703 },
b800c3b9
HFS		 5704 {
5705 .procname = "suppress_frag_ndisc",
5706 .data = &ipv6_devconf.suppress_frag_ndisc,
5707 .maxlen = sizeof(int),
5708 .mode = 0644,
5709 .proc_handler = proc_dointvec
5710 },
d9333196
BG		 5711 {
5712 .procname = "accept_ra_from_local",
5713 .data = &ipv6_devconf.accept_ra_from_local,
5714 .maxlen = sizeof(int),
5715 .mode = 0644,
5716 .proc_handler = proc_dointvec,
5717 },
c2943f14
HH		 5718 {
5719 .procname = "accept_ra_mtu",
5720 .data = &ipv6_devconf.accept_ra_mtu,
5721 .maxlen = sizeof(int),
5722 .mode = 0644,
5723 .proc_handler = proc_dointvec,
5724 },
3d1bec99
HFS		 5725 {
5726 .procname = "stable_secret",
5727 .data = &ipv6_devconf.stable_secret,
5728 .maxlen = IPV6_MAX_STRLEN,
5729 .mode = 0600,
5730 .proc_handler = addrconf_sysctl_stable_secret,
5731 },
3985e8a3
EK		 5732 {
5733 .procname = "use_oif_addrs_only",
5734 .data = &ipv6_devconf.use_oif_addrs_only,
5735 .maxlen = sizeof(int),
5736 .mode = 0644,
5737 .proc_handler = proc_dointvec,
35103d11
AG		 5738 },
5739 {
5740 .procname = "ignore_routes_with_linkdown",
5741 .data = &ipv6_devconf.ignore_routes_with_linkdown,
5742 .maxlen = sizeof(int),
5743 .mode = 0644,
5744 .proc_handler = addrconf_sysctl_ignore_routes_with_linkdown,
3985e8a3 5745 },
1da177e4 5746 {
f8572d8f 5747 /* sentinel */
1da177e4
LT		 5748 }
5749 },
1da177e4
LT		 5750};
5751
bff16c2f 5752static int __addrconf_sysctl_register(struct net *net, char *dev_name,
f8572d8f 5753 struct inet6_dev *idev, struct ipv6_devconf *p)
1da177e4
LT		 5754{
5755 int i;
1da177e4 5756 struct addrconf_sysctl_table *t;
6105e293 5757 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ];
1dab6222 5758
af879cc7 5759 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
63159f29 5760 if (!t)
f68635e6
PE		 5761 goto out;
5762
bcdd553f 5763 for (i = 0; t->addrconf_vars[i].data; i++) {
e21e8467 5764 t->addrconf_vars[i].data += (char *)p - (char *)&ipv6_devconf;
1da177e4 5765 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
bff16c2f 5766 t->addrconf_vars[i].extra2 = net;
1da177e4 5767 }
1da177e4 5768
6105e293 5769 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name);
1da177e4 5770
6105e293 5771 t->sysctl_header = register_net_sysctl(net, path, t->addrconf_vars);
63159f29 5772 if (!t->sysctl_header)
6105e293 5773 goto free;
f68635e6
PE		 5774
5775 p->sysctl = t;
95897312 5776 return 0;
1da177e4 5777
f68635e6 5778free:
1da177e4 5779 kfree(t);
f68635e6 5780out:
95897312 5781 return -ENOBUFS;
1da177e4
LT		 5782}
5783
408c4768
PE		 5784static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
5785{
5786 struct addrconf_sysctl_table *t;
5787
63159f29 5788 if (!p->sysctl)
408c4768
PE		 5789 return;
5790
5791 t = p->sysctl;
5792 p->sysctl = NULL;
ff538818 5793 unregister_net_sysctl_table(t->sysctl_header);
408c4768
PE		 5794 kfree(t);
5795}
5796
a317a2f1 5797static int addrconf_sysctl_register(struct inet6_dev *idev)
f52295a9 5798{
a317a2f1
WC		 5799 int err;
5800
5801 if (!sysctl_dev_name_is_allowed(idev->dev->name))
5802 return -EINVAL;
5803
5804 err = neigh_sysctl_register(idev->dev, idev->nd_parms,
5805 &ndisc_ifinfo_sysctl_change);
5806 if (err)
5807 return err;
5808 err = __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
5809 idev, &idev->cnf);
5810 if (err)
5811 neigh_sysctl_unregister(idev->nd_parms);
5812
5813 return err;
f52295a9
PE		 5814}
5815
408c4768 5816static void addrconf_sysctl_unregister(struct inet6_dev *idev)
1da177e4 5817{
408c4768
PE		 5818 __addrconf_sysctl_unregister(&idev->cnf);
5819 neigh_sysctl_unregister(idev->nd_parms);
1da177e4
LT		 5820}
5821
5822
5823#endif
5824
2c8c1e72 5825static int __net_init addrconf_init_net(struct net *net)
e0da5a48 5826{
a79ca223 5827 int err = -ENOMEM;
e0da5a48
PE		 5828 struct ipv6_devconf *all, *dflt;
5829
a79ca223 5830 all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL);
63159f29 5831 if (!all)
a79ca223 5832 goto err_alloc_all;
e0da5a48 5833
a79ca223 5834 dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
63159f29 5835 if (!dflt)
a79ca223 5836 goto err_alloc_dflt;
e0da5a48 5837
a79ca223
HZ		 5838 /* these will be inherited by all namespaces */
5839 dflt->autoconf = ipv6_defaults.autoconf;
5840 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
e0da5a48 5841
3d1bec99
HFS		 5842 dflt->stable_secret.initialized = false;
5843 all->stable_secret.initialized = false;
5844
e0da5a48
PE		 5845 net->ipv6.devconf_all = all;
5846 net->ipv6.devconf_dflt = dflt;
5847
5848#ifdef CONFIG_SYSCTL
f8572d8f 5849 err = __addrconf_sysctl_register(net, "all", NULL, all);
e0da5a48
PE		 5850 if (err < 0)
5851 goto err_reg_all;
5852
f8572d8f 5853 err = __addrconf_sysctl_register(net, "default", NULL, dflt);
e0da5a48
PE		 5854 if (err < 0)
5855 goto err_reg_dflt;
5856#endif
5857 return 0;
5858
5859#ifdef CONFIG_SYSCTL
5860err_reg_dflt:
5861 __addrconf_sysctl_unregister(all);
5862err_reg_all:
5863 kfree(dflt);
5864#endif
5865err_alloc_dflt:
5866 kfree(all);
5867err_alloc_all:
5868 return err;
5869}
5870
2c8c1e72 5871static void __net_exit addrconf_exit_net(struct net *net)
e0da5a48
PE		 5872{
5873#ifdef CONFIG_SYSCTL
5874 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
5875 __addrconf_sysctl_unregister(net->ipv6.devconf_all);
5876#endif
73cf0e92 5877 kfree(net->ipv6.devconf_dflt);
5878 kfree(net->ipv6.devconf_all);
e0da5a48
PE		 5879}
5880
5881static struct pernet_operations addrconf_ops = {
5882 .init = addrconf_init_net,
5883 .exit = addrconf_exit_net,
5884};
5885
207895fd 5886static struct rtnl_af_ops inet6_ops __read_mostly = {
b382b191
TG		 5887 .family = AF_INET6,
5888 .fill_link_af = inet6_fill_link_af,
5889 .get_link_af_size = inet6_get_link_af_size,
11b1f828 5890 .validate_link_af = inet6_validate_link_af,
f53adae4 5891 .set_link_af = inet6_set_link_af,
b382b191
TG		 5892};
5893
1da177e4
LT		 5894/*
5895 * Init / cleanup code
5896 */
5897
5898int __init addrconf_init(void)
5899{
a317a2f1 5900 struct inet6_dev *idev;
c2e21293 5901 int i, err;
2a8cc6c8 5902
e21e8467
SH		 5903 err = ipv6_addr_label_init();
5904 if (err < 0) {
f3213831
JP		 5905 pr_crit("%s: cannot initialize default policy table: %d\n",
5906 __func__, err);
2cc6d2bf 5907 goto out;
2a8cc6c8 5908 }
1da177e4 5909
2cc6d2bf
NH		 5910 err = register_pernet_subsys(&addrconf_ops);
5911 if (err < 0)
5912 goto out_addrlabel;
e0da5a48 5913
c15b1cca
HFS		 5914 addrconf_wq = create_workqueue("ipv6_addrconf");
5915 if (!addrconf_wq) {
5916 err = -ENOMEM;
5917 goto out_nowq;
5918 }
5919
1da177e4
LT		 5920 /* The addrconf netdev notifier requires that loopback_dev
5921 * has it's ipv6 private information allocated and setup
5922 * before it can bring up and give link-local addresses
5923 * to other devices which are up.
5924 *
5925 * Unfortunately, loopback_dev is not necessarily the first
5926 * entry in the global dev_base list of net devices. In fact,
5927 * it is likely to be the very last entry on that list.
5928 * So this causes the notifier registry below to try and
5929 * give link-local addresses to all devices besides loopback_dev
5930 * first, then loopback_dev, which cases all the non-loopback_dev
5931 * devices to fail to get a link-local address.
5932 *
5933 * So, as a temporary fix, allocate the ipv6 structure for
5934 * loopback_dev first by hand.
5935 * Longer term, all of the dependencies ipv6 has upon the loopback
5936 * device and it being up should be removed.
5937 */
5938 rtnl_lock();
a317a2f1 5939 idev = ipv6_add_dev(init_net.loopback_dev);
1da177e4 5940 rtnl_unlock();
a317a2f1
WC		 5941 if (IS_ERR(idev)) {
5942 err = PTR_ERR(idev);
e0da5a48 5943 goto errlo;
a317a2f1 5944 }
1da177e4 5945
c2e21293 5946 for (i = 0; i < IN6_ADDR_HSIZE; i++)
5947 INIT_HLIST_HEAD(&inet6_addr_lst[i]);
5948
1da177e4
LT		 5949 register_netdevice_notifier(&ipv6_dev_notf);
5950
c15b1cca 5951 addrconf_verify();
c127ea2c 5952
3678a9d8 5953 rtnl_af_register(&inet6_ops);
b382b191 5954
c7ac8679
GR		 5955 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo,
5956 NULL);
c127ea2c
TG		 5957 if (err < 0)
5958 goto errout;
5959
5960 /* Only the first call to __rtnl_register can fail */
c7ac8679
GR		 5961 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL, NULL);
5962 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL, NULL);
5963 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr,
5964 inet6_dump_ifaddr, NULL);
5965 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL,
5966 inet6_dump_ifmcaddr, NULL);
5967 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL,
5968 inet6_dump_ifacaddr, NULL);
76f8f6cb 5969 __rtnl_register(PF_INET6, RTM_GETNETCONF, inet6_netconf_get_devconf,
7a674200 5970 inet6_netconf_dump_devconf, NULL);
c127ea2c 5971
2a8cc6c8
YH		 5972 ipv6_addr_label_rtnl_register();
5973
1da177e4 5974 return 0;
c127ea2c 5975errout:
b382b191 5976 rtnl_af_unregister(&inet6_ops);
c127ea2c 5977 unregister_netdevice_notifier(&ipv6_dev_notf);
e0da5a48 5978errlo:
c15b1cca
HFS		 5979 destroy_workqueue(addrconf_wq);
5980out_nowq:
e0da5a48 5981 unregister_pernet_subsys(&addrconf_ops);
2cc6d2bf
NH		 5982out_addrlabel:
5983 ipv6_addr_label_cleanup();
5984out:
c127ea2c 5985 return err;
1da177e4
LT		 5986}
5987
09f7709f 5988void addrconf_cleanup(void)
1da177e4 5989{
176c39af 5990 struct net_device *dev;
1da177e4
LT		 5991 int i;
5992
5993 unregister_netdevice_notifier(&ipv6_dev_notf);
e0da5a48 5994 unregister_pernet_subsys(&addrconf_ops);
2cc6d2bf 5995 ipv6_addr_label_cleanup();
1da177e4
LT		 5996
5997 rtnl_lock();
5998
b382b191
TG		 5999 __rtnl_af_unregister(&inet6_ops);
6000
176c39af
DL		 6001 /* clean dev list */
6002 for_each_netdev(&init_net, dev) {
6003 if (__in6_dev_get(dev) == NULL)
6004 continue;
6005 addrconf_ifdown(dev, 1);
6006 }
6007 addrconf_ifdown(init_net.loopback_dev, 2);
6008
1da177e4
LT		 6009 /*
6010 * Check hash table.
6011 */
5c578aed 6012 spin_lock_bh(&addrconf_hash_lock);
c2e21293 6013 for (i = 0; i < IN6_ADDR_HSIZE; i++)
6014 WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
5c578aed 6015 spin_unlock_bh(&addrconf_hash_lock);
c15b1cca 6016 cancel_delayed_work(&addr_chk_work);
1da177e4 6017 rtnl_unlock();
c15b1cca
HFS		 6018
6019 destroy_workqueue(addrconf_wq);
1da177e4 6020}
Ubuntu Jammy Linux kernel mirror