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bpf: add skb_postpush_rcsum and fix dev_forward_skb occasions
[deliverable/linux.git] / net / ipv6 / addrconf.c
CommitLineData
1da177e4
LT		 1/*
2 * IPv6 Address [auto]configuration
3 * Linux INET6 implementation
4 *
5 * Authors:
1ab1457c 6 * Pedro Roque <roque@di.fc.ul.pt>
1da177e4
LT		 7 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
8 *
1da177e4
LT		 9 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License
11 * as published by the Free Software Foundation; either version
12 * 2 of the License, or (at your option) any later version.
13 */
14
15/*
16 * Changes:
17 *
18 * Janos Farkas : delete timer on ifdown
19 * <chexum@bankinf.banki.hu>
20 * Andi Kleen : kill double kfree on module
21 * unload.
22 * Maciej W. Rozycki : FDDI support
23 * sekiya@USAGI : Don't send too many RS
24 * packets.
25 * yoshfuji@USAGI : Fixed interval between DAD
26 * packets.
27 * YOSHIFUJI Hideaki @USAGI : improved accuracy of
28 * address validation timer.
29 * YOSHIFUJI Hideaki @USAGI : Privacy Extensions (RFC3041)
30 * support.
31 * Yuji SEKIYA @USAGI : Don't assign a same IPv6
32 * address on a same interface.
33 * YOSHIFUJI Hideaki @USAGI : ARCnet support
34 * YOSHIFUJI Hideaki @USAGI : convert /proc/net/if_inet6 to
35 * seq_file.
b1cacb68
YH		 36 * YOSHIFUJI Hideaki @USAGI : improved source address
37 * selection; consider scope,
38 * status etc.
1da177e4
LT		 39 */
40
f3213831
JP		 41#define pr_fmt(fmt) "IPv6: " fmt
42
1da177e4
LT		 43#include <linux/errno.h>
44#include <linux/types.h>
a0bffffc 45#include <linux/kernel.h>
1da177e4
LT		 46#include <linux/socket.h>
47#include <linux/sockios.h>
1da177e4 48#include <linux/net.h>
3d1bec99 49#include <linux/inet.h>
1da177e4
LT		 50#include <linux/in6.h>
51#include <linux/netdevice.h>
1823730f 52#include <linux/if_addr.h>
1da177e4
LT		 53#include <linux/if_arp.h>
54#include <linux/if_arcnet.h>
55#include <linux/if_infiniband.h>
56#include <linux/route.h>
57#include <linux/inetdevice.h>
58#include <linux/init.h>
5a0e3ad6 59#include <linux/slab.h>
1da177e4
LT		 60#ifdef CONFIG_SYSCTL
61#include <linux/sysctl.h>
62#endif
4fc268d2 63#include <linux/capability.h>
1da177e4
LT		 64#include <linux/delay.h>
65#include <linux/notifier.h>
543537bd 66#include <linux/string.h>
ddbe5032 67#include <linux/hash.h>
1da177e4 68
457c4cbc 69#include <net/net_namespace.h>
1da177e4
LT		 70#include <net/sock.h>
71#include <net/snmp.h>
72
5241c2d7 73#include <net/6lowpan.h>
cb6bf355 74#include <net/firewire.h>
1da177e4
LT		 75#include <net/ipv6.h>
76#include <net/protocol.h>
77#include <net/ndisc.h>
78#include <net/ip6_route.h>
79#include <net/addrconf.h>
80#include <net/tcp.h>
81#include <net/ip.h>
5d620266 82#include <net/netlink.h>
f24e3d65 83#include <net/pkt_sched.h>
ca254490 84#include <net/l3mdev.h>
1da177e4
LT		 85#include <linux/if_tunnel.h>
86#include <linux/rtnetlink.h>
f3a1bfb1 87#include <linux/netconf.h>
1da177e4 88#include <linux/random.h>
e21e8467 89#include <linux/uaccess.h>
7f7d9a6b 90#include <asm/unaligned.h>
1da177e4
LT		 91
92#include <linux/proc_fs.h>
93#include <linux/seq_file.h>
bc3b2d7f 94#include <linux/export.h>
1da177e4
LT		 95
96/* Set to 3 to get tracing... */
97#define ACONF_DEBUG 2
98
99#if ACONF_DEBUG >= 3
ba3542e1 100#define ADBG(fmt, ...) printk(fmt, ##__VA_ARGS__)
1da177e4 101#else
ba3542e1 102#define ADBG(fmt, ...) do { if (0) printk(fmt, ##__VA_ARGS__); } while (0)
1da177e4
LT		 103#endif
104
105#define INFINITY_LIFE_TIME 0xFFFFFFFF
18a31e1e 106
3d1bec99
HFS		 107#define IPV6_MAX_STRLEN \
108 sizeof("ffff:ffff:ffff:ffff:ffff:ffff:255.255.255.255")
109
18a31e1e
TG		 110static inline u32 cstamp_delta(unsigned long cstamp)
111{
112 return (cstamp - INITIAL_JIFFIES) * 100UL / HZ;
113}
1da177e4
LT		 114
115#ifdef CONFIG_SYSCTL
a317a2f1 116static int addrconf_sysctl_register(struct inet6_dev *idev);
408c4768
PE		 117static void addrconf_sysctl_unregister(struct inet6_dev *idev);
118#else
a317a2f1 119static inline int addrconf_sysctl_register(struct inet6_dev *idev)
408c4768 120{
a317a2f1 121 return 0;
408c4768
PE		 122}
123
124static inline void addrconf_sysctl_unregister(struct inet6_dev *idev)
125{
126}
1da177e4
LT		 127#endif
128
eb7e0575
SD		 129static void __ipv6_regen_rndid(struct inet6_dev *idev);
130static void __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
1da177e4 131static void ipv6_regen_rndid(unsigned long data);
1da177e4 132
1b34be74 133static int ipv6_generate_eui64(u8 *eui, struct net_device *dev);
1da177e4 134static int ipv6_count_addresses(struct inet6_dev *idev);
622c81d5
HFS		 135static int ipv6_generate_stable_address(struct in6_addr *addr,
136 u8 dad_count,
137 const struct inet6_dev *idev);
1da177e4
LT		 138
139/*
140 * Configured unicast address hash table
141 */
c2e21293 142static struct hlist_head inet6_addr_lst[IN6_ADDR_HSIZE];
5c578aed 143static DEFINE_SPINLOCK(addrconf_hash_lock);
1da177e4 144
c15b1cca
HFS		 145static void addrconf_verify(void);
146static void addrconf_verify_rtnl(void);
147static void addrconf_verify_work(struct work_struct *);
1da177e4 148
c15b1cca
HFS		 149static struct workqueue_struct *addrconf_wq;
150static DECLARE_DELAYED_WORK(addr_chk_work, addrconf_verify_work);
1da177e4
LT		 151
152static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
153static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
154
93d9b7d7
JP		 155static void addrconf_type_change(struct net_device *dev,
156 unsigned long event);
1da177e4
LT		 157static int addrconf_ifdown(struct net_device *dev, int how);
158
21caa662
RK		 159static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
160 int plen,
161 const struct net_device *dev,
162 u32 flags, u32 noflags);
163
cf22f9a2 164static void addrconf_dad_start(struct inet6_ifaddr *ifp);
c15b1cca 165static void addrconf_dad_work(struct work_struct *w);
1da177e4 166static void addrconf_dad_completed(struct inet6_ifaddr *ifp);
c5e33bdd 167static void addrconf_dad_run(struct inet6_dev *idev);
1da177e4
LT		 168static void addrconf_rs_timer(unsigned long data);
169static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
170static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
171
1ab1457c 172static void inet6_prefix_notify(int event, struct inet6_dev *idev,
1da177e4 173 struct prefix_info *pinfo);
3e81c6da
DM		 174static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
175 struct net_device *dev);
1da177e4 176
888c848e 177static struct ipv6_devconf ipv6_devconf __read_mostly = {
1da177e4
LT		 178 .forwarding = 0,
179 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
180 .mtu6 = IPV6_MIN_MTU,
181 .accept_ra = 1,
182 .accept_redirects = 1,
183 .autoconf = 1,
184 .force_mld_version = 0,
fc4eba58
HFS		 185 .mldv1_unsolicited_report_interval = 10 * HZ,
186 .mldv2_unsolicited_report_interval = HZ,
1da177e4
LT		 187 .dad_transmits = 1,
188 .rtr_solicits = MAX_RTR_SOLICITATIONS,
189 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
190 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
67ba4152 191 .use_tempaddr = 0,
1da177e4
LT		 192 .temp_valid_lft = TEMP_VALID_LIFETIME,
193 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
194 .regen_max_retry = REGEN_MAX_RETRY,
195 .max_desync_factor = MAX_DESYNC_FACTOR,
1da177e4 196 .max_addresses = IPV6_MAX_ADDRESSES,
65f5c7c1 197 .accept_ra_defrtr = 1,
d9333196 198 .accept_ra_from_local = 0,
8013d1d7 199 .accept_ra_min_hop_limit= 1,
c4fd30eb 200 .accept_ra_pinfo = 1,
930d6ff2
YH		 201#ifdef CONFIG_IPV6_ROUTER_PREF
202 .accept_ra_rtr_pref = 1,
52e16356 203 .rtr_probe_interval = 60 * HZ,
09c884d4
YH		 204#ifdef CONFIG_IPV6_ROUTE_INFO
205 .accept_ra_rt_info_max_plen = 0,
206#endif
930d6ff2 207#endif
fbea49e1 208 .proxy_ndp = 0,
0bcbc926 209 .accept_source_route = 0, /* we do not accept RH0 by default. */
778d80be 210 .disable_ipv6 = 0,
1b34be74 211 .accept_dad = 1,
b800c3b9 212 .suppress_frag_ndisc = 1,
c2943f14 213 .accept_ra_mtu = 1,
3d1bec99
HFS		 214 .stable_secret = {
215 .initialized = false,
3985e8a3
EK		 216 },
217 .use_oif_addrs_only = 0,
35103d11 218 .ignore_routes_with_linkdown = 0,
1da177e4
LT		 219};
220
ab32ea5d 221static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
1da177e4
LT		 222 .forwarding = 0,
223 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
224 .mtu6 = IPV6_MIN_MTU,
225 .accept_ra = 1,
226 .accept_redirects = 1,
227 .autoconf = 1,
fc4eba58
HFS		 228 .force_mld_version = 0,
229 .mldv1_unsolicited_report_interval = 10 * HZ,
230 .mldv2_unsolicited_report_interval = HZ,
1da177e4
LT		 231 .dad_transmits = 1,
232 .rtr_solicits = MAX_RTR_SOLICITATIONS,
233 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
234 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
1da177e4
LT		 235 .use_tempaddr = 0,
236 .temp_valid_lft = TEMP_VALID_LIFETIME,
237 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
238 .regen_max_retry = REGEN_MAX_RETRY,
239 .max_desync_factor = MAX_DESYNC_FACTOR,
1da177e4 240 .max_addresses = IPV6_MAX_ADDRESSES,
65f5c7c1 241 .accept_ra_defrtr = 1,
d9333196 242 .accept_ra_from_local = 0,
8013d1d7 243 .accept_ra_min_hop_limit= 1,
c4fd30eb 244 .accept_ra_pinfo = 1,
930d6ff2
YH		 245#ifdef CONFIG_IPV6_ROUTER_PREF
246 .accept_ra_rtr_pref = 1,
52e16356 247 .rtr_probe_interval = 60 * HZ,
09c884d4
YH		 248#ifdef CONFIG_IPV6_ROUTE_INFO
249 .accept_ra_rt_info_max_plen = 0,
250#endif
930d6ff2 251#endif
fbea49e1 252 .proxy_ndp = 0,
0bcbc926 253 .accept_source_route = 0, /* we do not accept RH0 by default. */
778d80be 254 .disable_ipv6 = 0,
1b34be74 255 .accept_dad = 1,
b800c3b9 256 .suppress_frag_ndisc = 1,
c2943f14 257 .accept_ra_mtu = 1,
3d1bec99
HFS		 258 .stable_secret = {
259 .initialized = false,
260 },
3985e8a3 261 .use_oif_addrs_only = 0,
35103d11 262 .ignore_routes_with_linkdown = 0,
1da177e4
LT		 263};
264
f24e3d65 265/* Check if a valid qdisc is available */
05297949 266static inline bool addrconf_qdisc_ok(const struct net_device *dev)
f24e3d65 267{
05297949 268 return !qdisc_tx_is_noop(dev);
f24e3d65
MC		 269}
270
b7b1bfce 271static void addrconf_del_rs_timer(struct inet6_dev *idev)
1da177e4 272{
b7b1bfce
HFS		 273 if (del_timer(&idev->rs_timer))
274 __in6_dev_put(idev);
275}
276
c15b1cca 277static void addrconf_del_dad_work(struct inet6_ifaddr *ifp)
b7b1bfce 278{
c15b1cca 279 if (cancel_delayed_work(&ifp->dad_work))
1da177e4
LT		 280 __in6_ifa_put(ifp);
281}
282
b7b1bfce
HFS		 283static void addrconf_mod_rs_timer(struct inet6_dev *idev,
284 unsigned long when)
285{
286 if (!timer_pending(&idev->rs_timer))
287 in6_dev_hold(idev);
288 mod_timer(&idev->rs_timer, jiffies + when);
289}
1da177e4 290
c15b1cca
HFS		 291static void addrconf_mod_dad_work(struct inet6_ifaddr *ifp,
292 unsigned long delay)
1da177e4 293{
c15b1cca 294 if (!delayed_work_pending(&ifp->dad_work))
1da177e4 295 in6_ifa_hold(ifp);
c15b1cca 296 mod_delayed_work(addrconf_wq, &ifp->dad_work, delay);
1da177e4
LT		 297}
298
7f7d9a6b
HX		 299static int snmp6_alloc_dev(struct inet6_dev *idev)
300{
827da44c
JS		 301 int i;
302
698365fa
WC		 303 idev->stats.ipv6 = alloc_percpu(struct ipstats_mib);
304 if (!idev->stats.ipv6)
7f7d9a6b 305 goto err_ip;
827da44c
JS		 306
307 for_each_possible_cpu(i) {
308 struct ipstats_mib *addrconf_stats;
698365fa 309 addrconf_stats = per_cpu_ptr(idev->stats.ipv6, i);
827da44c 310 u64_stats_init(&addrconf_stats->syncp);
827da44c
JS		 311 }
312
313
be281e55
ED		 314 idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device),
315 GFP_KERNEL);
316 if (!idev->stats.icmpv6dev)
7f7d9a6b 317 goto err_icmp;
be281e55
ED		 318 idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device),
319 GFP_KERNEL);
320 if (!idev->stats.icmpv6msgdev)
14878f75 321 goto err_icmpmsg;
7f7d9a6b
HX		 322
323 return 0;
324
14878f75 325err_icmpmsg:
be281e55 326 kfree(idev->stats.icmpv6dev);
7f7d9a6b 327err_icmp:
698365fa 328 free_percpu(idev->stats.ipv6);
7f7d9a6b 329err_ip:
aaf70ec7 330 return -ENOMEM;
7f7d9a6b
HX		 331}
332
8e5e8f30 333static struct inet6_dev *ipv6_add_dev(struct net_device *dev)
1da177e4
LT		 334{
335 struct inet6_dev *ndev;
a317a2f1 336 int err = -ENOMEM;
1da177e4
LT		 337
338 ASSERT_RTNL();
339
340 if (dev->mtu < IPV6_MIN_MTU)
a317a2f1 341 return ERR_PTR(-EINVAL);
1da177e4 342
1ab1457c 343 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
63159f29 344 if (!ndev)
a317a2f1 345 return ERR_PTR(err);
322f74a4
IO		 346
347 rwlock_init(&ndev->lock);
348 ndev->dev = dev;
502a2ffd 349 INIT_LIST_HEAD(&ndev->addr_list);
b7b1bfce
HFS		 350 setup_timer(&ndev->rs_timer, addrconf_rs_timer,
351 (unsigned long)ndev);
c346dca1 352 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf));
9b29c696
HFS		 353
354 if (ndev->cnf.stable_secret.initialized)
355 ndev->addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
356 else
357 ndev->addr_gen_mode = IN6_ADDR_GEN_MODE_EUI64;
358
322f74a4
IO		 359 ndev->cnf.mtu6 = dev->mtu;
360 ndev->cnf.sysctl = NULL;
361 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
63159f29 362 if (!ndev->nd_parms) {
322f74a4 363 kfree(ndev);
a317a2f1 364 return ERR_PTR(err);
322f74a4 365 }
0187bdfb
BH		 366 if (ndev->cnf.forwarding)
367 dev_disable_lro(dev);
322f74a4
IO		 368 /* We refer to the device */
369 dev_hold(dev);
1da177e4 370
322f74a4 371 if (snmp6_alloc_dev(ndev) < 0) {
ba3542e1 372 ADBG(KERN_WARNING
f3213831 373 "%s: cannot allocate memory for statistics; dev=%s.\n",
ba3542e1 374 __func__, dev->name);
322f74a4 375 neigh_parms_release(&nd_tbl, ndev->nd_parms);
8603e33d
RL		 376 dev_put(dev);
377 kfree(ndev);
a317a2f1 378 return ERR_PTR(err);
322f74a4 379 }
1da177e4 380
322f74a4 381 if (snmp6_register_dev(ndev) < 0) {
ba3542e1 382 ADBG(KERN_WARNING
f3213831 383 "%s: cannot create /proc/net/dev_snmp6/%s\n",
ba3542e1 384 __func__, dev->name);
a317a2f1 385 goto err_release;
322f74a4
IO		 386 }
387
388 /* One reference from device. We must do this before
389 * we invoke __ipv6_regen_rndid().
390 */
391 in6_dev_hold(ndev);
1da177e4 392
1b34be74
YH		 393 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
394 ndev->cnf.accept_dad = -1;
395
07a93626 396#if IS_ENABLED(CONFIG_IPV6_SIT)
b077d7ab 397 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
f3213831 398 pr_info("%s: Disabled Multicast RS\n", dev->name);
b077d7ab
YH		 399 ndev->cnf.rtr_solicits = 0;
400 }
401#endif
402
372e6c8f 403 INIT_LIST_HEAD(&ndev->tempaddr_list);
b24b8a24 404 setup_timer(&ndev->regen_timer, ipv6_regen_rndid, (unsigned long)ndev);
322f74a4
IO		 405 if ((dev->flags&IFF_LOOPBACK) ||
406 dev->type == ARPHRD_TUNNEL ||
9625ed72 407 dev->type == ARPHRD_TUNNEL6 ||
0be669bb 408 dev->type == ARPHRD_SIT ||
0be669bb 409 dev->type == ARPHRD_NONE) {
322f74a4
IO		 410 ndev->cnf.use_tempaddr = -1;
411 } else {
412 in6_dev_hold(ndev);
413 ipv6_regen_rndid((unsigned long) ndev);
414 }
5d9efa7e 415
914faa14 416 ndev->token = in6addr_any;
1da177e4 417
f24e3d65 418 if (netif_running(dev) && addrconf_qdisc_ok(dev))
53aadcc9
HX		 419 ndev->if_flags |= IF_READY;
420
322f74a4
IO		 421 ipv6_mc_init_dev(ndev);
422 ndev->tstamp = jiffies;
a317a2f1
WC		 423 err = addrconf_sysctl_register(ndev);
424 if (err) {
425 ipv6_mc_destroy_dev(ndev);
426 del_timer(&ndev->regen_timer);
2a189f9e 427 snmp6_unregister_dev(ndev);
a317a2f1
WC		 428 goto err_release;
429 }
30c4cf57 430 /* protected by rtnl_lock */
cf778b00 431 rcu_assign_pointer(dev->ip6_ptr, ndev);
d88ae4cc 432
2c5e8933
HFS		 433 /* Join interface-local all-node multicast group */
434 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allnodes);
435
d88ae4cc 436 /* Join all-node multicast group */
f3ee4010 437 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);
d88ae4cc 438
d6ddef9e 439 /* Join all-router multicast group if forwarding is set */
8b2aaede 440 if (ndev->cnf.forwarding && (dev->flags & IFF_MULTICAST))
d6ddef9e
LW		 441 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
442
1da177e4 443 return ndev;
a317a2f1
WC		 444
445err_release:
446 neigh_parms_release(&nd_tbl, ndev->nd_parms);
447 ndev->dead = 1;
448 in6_dev_finish_destroy(ndev);
449 return ERR_PTR(err);
1da177e4
LT		 450}
451
8e5e8f30 452static struct inet6_dev *ipv6_find_idev(struct net_device *dev)
1da177e4
LT		 453{
454 struct inet6_dev *idev;
455
456 ASSERT_RTNL();
457
e21e8467
SH		 458 idev = __in6_dev_get(dev);
459 if (!idev) {
460 idev = ipv6_add_dev(dev);
a317a2f1 461 if (IS_ERR(idev))
1da177e4
LT		 462 return NULL;
463 }
c5e33bdd 464
1da177e4
LT		 465 if (dev->flags&IFF_UP)
466 ipv6_mc_up(idev);
467 return idev;
468}
469
f3a1bfb1
ND		 470static int inet6_netconf_msgsize_devconf(int type)
471{
472 int size = NLMSG_ALIGN(sizeof(struct netconfmsg))
473 + nla_total_size(4); /* NETCONFA_IFINDEX */
474
76f8f6cb
ND		 475 /* type -1 is used for ALL */
476 if (type == -1 || type == NETCONFA_FORWARDING)
f3a1bfb1 477 size += nla_total_size(4);
b1afce95 478#ifdef CONFIG_IPV6_MROUTE
d67b8c61
ND		 479 if (type == -1 || type == NETCONFA_MC_FORWARDING)
480 size += nla_total_size(4);
b1afce95 481#endif
c92d5491 482 if (type == -1 || type == NETCONFA_PROXY_NEIGH)
483 size += nla_total_size(4);
f3a1bfb1 484
35103d11
AG		 485 if (type == -1 || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN)
486 size += nla_total_size(4);
487
f3a1bfb1
ND		 488 return size;
489}
490
491static int inet6_netconf_fill_devconf(struct sk_buff *skb, int ifindex,
492 struct ipv6_devconf *devconf, u32 portid,
493 u32 seq, int event, unsigned int flags,
494 int type)
495{
496 struct nlmsghdr *nlh;
497 struct netconfmsg *ncm;
498
499 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg),
500 flags);
63159f29 501 if (!nlh)
f3a1bfb1
ND		 502 return -EMSGSIZE;
503
504 ncm = nlmsg_data(nlh);
505 ncm->ncm_family = AF_INET6;
506
507 if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0)
508 goto nla_put_failure;
509
76f8f6cb
ND		 510 /* type -1 is used for ALL */
511 if ((type == -1 || type == NETCONFA_FORWARDING) &&
f3a1bfb1
ND		 512 nla_put_s32(skb, NETCONFA_FORWARDING, devconf->forwarding) < 0)
513 goto nla_put_failure;
b1afce95 514#ifdef CONFIG_IPV6_MROUTE
d67b8c61
ND		 515 if ((type == -1 || type == NETCONFA_MC_FORWARDING) &&
516 nla_put_s32(skb, NETCONFA_MC_FORWARDING,
517 devconf->mc_forwarding) < 0)
518 goto nla_put_failure;
b1afce95 519#endif
c92d5491 520 if ((type == -1 || type == NETCONFA_PROXY_NEIGH) &&
521 nla_put_s32(skb, NETCONFA_PROXY_NEIGH, devconf->proxy_ndp) < 0)
522 goto nla_put_failure;
523
35103d11
AG		 524 if ((type == -1 || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN) &&
525 nla_put_s32(skb, NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
526 devconf->ignore_routes_with_linkdown) < 0)
527 goto nla_put_failure;
528
053c095a
JB		 529 nlmsg_end(skb, nlh);
530 return 0;
f3a1bfb1
ND		 531
532nla_put_failure:
533 nlmsg_cancel(skb, nlh);
534 return -EMSGSIZE;
535}
536
d67b8c61
ND		 537void inet6_netconf_notify_devconf(struct net *net, int type, int ifindex,
538 struct ipv6_devconf *devconf)
f3a1bfb1
ND		 539{
540 struct sk_buff *skb;
541 int err = -ENOBUFS;
542
543 skb = nlmsg_new(inet6_netconf_msgsize_devconf(type), GFP_ATOMIC);
63159f29 544 if (!skb)
f3a1bfb1
ND		 545 goto errout;
546
547 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 0, 0,
548 RTM_NEWNETCONF, 0, type);
549 if (err < 0) {
550 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
551 WARN_ON(err == -EMSGSIZE);
552 kfree_skb(skb);
553 goto errout;
554 }
555 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_NETCONF, NULL, GFP_ATOMIC);
556 return;
557errout:
bd779028 558 rtnl_set_sk_err(net, RTNLGRP_IPV6_NETCONF, err);
f3a1bfb1
ND		 559}
560
76f8f6cb
ND		 561static const struct nla_policy devconf_ipv6_policy[NETCONFA_MAX+1] = {
562 [NETCONFA_IFINDEX] = { .len = sizeof(int) },
563 [NETCONFA_FORWARDING] = { .len = sizeof(int) },
c92d5491 564 [NETCONFA_PROXY_NEIGH] = { .len = sizeof(int) },
35103d11 565 [NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN] = { .len = sizeof(int) },
76f8f6cb
ND		 566};
567
568static int inet6_netconf_get_devconf(struct sk_buff *in_skb,
661d2967 569 struct nlmsghdr *nlh)
76f8f6cb
ND		 570{
571 struct net *net = sock_net(in_skb->sk);
572 struct nlattr *tb[NETCONFA_MAX+1];
573 struct netconfmsg *ncm;
574 struct sk_buff *skb;
575 struct ipv6_devconf *devconf;
576 struct inet6_dev *in6_dev;
577 struct net_device *dev;
578 int ifindex;
579 int err;
580
581 err = nlmsg_parse(nlh, sizeof(*ncm), tb, NETCONFA_MAX,
582 devconf_ipv6_policy);
583 if (err < 0)
584 goto errout;
585
586 err = EINVAL;
587 if (!tb[NETCONFA_IFINDEX])
588 goto errout;
589
590 ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]);
591 switch (ifindex) {
592 case NETCONFA_IFINDEX_ALL:
593 devconf = net->ipv6.devconf_all;
594 break;
595 case NETCONFA_IFINDEX_DEFAULT:
596 devconf = net->ipv6.devconf_dflt;
597 break;
598 default:
599 dev = __dev_get_by_index(net, ifindex);
63159f29 600 if (!dev)
76f8f6cb
ND		 601 goto errout;
602 in6_dev = __in6_dev_get(dev);
63159f29 603 if (!in6_dev)
76f8f6cb
ND		 604 goto errout;
605 devconf = &in6_dev->cnf;
606 break;
607 }
608
609 err = -ENOBUFS;
610 skb = nlmsg_new(inet6_netconf_msgsize_devconf(-1), GFP_ATOMIC);
63159f29 611 if (!skb)
76f8f6cb
ND		 612 goto errout;
613
614 err = inet6_netconf_fill_devconf(skb, ifindex, devconf,
615 NETLINK_CB(in_skb).portid,
616 nlh->nlmsg_seq, RTM_NEWNETCONF, 0,
617 -1);
618 if (err < 0) {
619 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
620 WARN_ON(err == -EMSGSIZE);
621 kfree_skb(skb);
622 goto errout;
623 }
624 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
625errout:
626 return err;
627}
628
7a674200
ND		 629static int inet6_netconf_dump_devconf(struct sk_buff *skb,
630 struct netlink_callback *cb)
631{
632 struct net *net = sock_net(skb->sk);
633 int h, s_h;
634 int idx, s_idx;
635 struct net_device *dev;
636 struct inet6_dev *idev;
637 struct hlist_head *head;
638
639 s_h = cb->args[0];
640 s_idx = idx = cb->args[1];
641
642 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
643 idx = 0;
644 head = &net->dev_index_head[h];
645 rcu_read_lock();
63998ac2
ND		 646 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^
647 net->dev_base_seq;
7a674200
ND		 648 hlist_for_each_entry_rcu(dev, head, index_hlist) {
649 if (idx < s_idx)
650 goto cont;
651 idev = __in6_dev_get(dev);
652 if (!idev)
653 goto cont;
654
655 if (inet6_netconf_fill_devconf(skb, dev->ifindex,
656 &idev->cnf,
657 NETLINK_CB(cb->skb).portid,
658 cb->nlh->nlmsg_seq,
659 RTM_NEWNETCONF,
660 NLM_F_MULTI,
053c095a 661 -1) < 0) {
7a674200
ND		 662 rcu_read_unlock();
663 goto done;
664 }
63998ac2 665 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
7a674200
ND		 666cont:
667 idx++;
668 }
669 rcu_read_unlock();
670 }
671 if (h == NETDEV_HASHENTRIES) {
672 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL,
673 net->ipv6.devconf_all,
674 NETLINK_CB(cb->skb).portid,
675 cb->nlh->nlmsg_seq,
676 RTM_NEWNETCONF, NLM_F_MULTI,
053c095a 677 -1) < 0)
7a674200
ND		 678 goto done;
679 else
680 h++;
681 }
682 if (h == NETDEV_HASHENTRIES + 1) {
683 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT,
684 net->ipv6.devconf_dflt,
685 NETLINK_CB(cb->skb).portid,
686 cb->nlh->nlmsg_seq,
687 RTM_NEWNETCONF, NLM_F_MULTI,
053c095a 688 -1) < 0)
7a674200
ND		 689 goto done;
690 else
691 h++;
692 }
693done:
694 cb->args[0] = h;
695 cb->args[1] = idx;
696
697 return skb->len;
698}
699
1da177e4
LT		 700#ifdef CONFIG_SYSCTL
701static void dev_forward_change(struct inet6_dev *idev)
702{
703 struct net_device *dev;
704 struct inet6_ifaddr *ifa;
1da177e4
LT		 705
706 if (!idev)
707 return;
708 dev = idev->dev;
0187bdfb
BH		 709 if (idev->cnf.forwarding)
710 dev_disable_lro(dev);
1a940835 711 if (dev->flags & IFF_MULTICAST) {
2c5e8933 712 if (idev->cnf.forwarding) {
f3ee4010 713 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
2c5e8933
HFS		 714 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allrouters);
715 ipv6_dev_mc_inc(dev, &in6addr_sitelocal_allrouters);
716 } else {
f3ee4010 717 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
2c5e8933
HFS		 718 ipv6_dev_mc_dec(dev, &in6addr_interfacelocal_allrouters);
719 ipv6_dev_mc_dec(dev, &in6addr_sitelocal_allrouters);
720 }
1da177e4 721 }
502a2ffd 722
723 list_for_each_entry(ifa, &idev->addr_list, if_list) {
2c12a74c
MW		 724 if (ifa->flags&IFA_F_TENTATIVE)
725 continue;
1da177e4
LT		 726 if (idev->cnf.forwarding)
727 addrconf_join_anycast(ifa);
728 else
729 addrconf_leave_anycast(ifa);
730 }
f3a1bfb1
ND		 731 inet6_netconf_notify_devconf(dev_net(dev), NETCONFA_FORWARDING,
732 dev->ifindex, &idev->cnf);
1da177e4
LT		 733}
734
735
e186932b 736static void addrconf_forward_change(struct net *net, __s32 newf)
1da177e4
LT		 737{
738 struct net_device *dev;
739 struct inet6_dev *idev;
740
4acd4945 741 for_each_netdev(net, dev) {
1da177e4
LT		 742 idev = __in6_dev_get(dev);
743 if (idev) {
e186932b
PE		 744 int changed = (!idev->cnf.forwarding) ^ (!newf);
745 idev->cnf.forwarding = newf;
1da177e4
LT		 746 if (changed)
747 dev_forward_change(idev);
748 }
1da177e4 749 }
1da177e4 750}
c8fecf22 751
013d97e9 752static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf)
c8fecf22 753{
bff16c2f 754 struct net *net;
013d97e9
FR		 755 int old;
756
757 if (!rtnl_trylock())
758 return restart_syscall();
bff16c2f
PE		 759
760 net = (struct net *)table->extra2;
013d97e9
FR		 761 old = *p;
762 *p = newf;
b325fddb 763
013d97e9 764 if (p == &net->ipv6.devconf_dflt->forwarding) {
f3a1bfb1
ND		 765 if ((!newf) ^ (!old))
766 inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING,
767 NETCONFA_IFINDEX_DEFAULT,
768 net->ipv6.devconf_dflt);
013d97e9
FR		 769 rtnl_unlock();
770 return 0;
88af182e 771 }
c8fecf22 772
e186932b 773 if (p == &net->ipv6.devconf_all->forwarding) {
e186932b
PE		 774 net->ipv6.devconf_dflt->forwarding = newf;
775 addrconf_forward_change(net, newf);
f3a1bfb1
ND		 776 if ((!newf) ^ (!old))
777 inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING,
778 NETCONFA_IFINDEX_ALL,
779 net->ipv6.devconf_all);
013d97e9 780 } else if ((!newf) ^ (!old))
c8fecf22 781 dev_forward_change((struct inet6_dev *)table->extra1);
0187bdfb 782 rtnl_unlock();
c8fecf22 783
013d97e9 784 if (newf)
7b4da532 785 rt6_purge_dflt_routers(net);
b325fddb 786 return 1;
c8fecf22 787}
35103d11
AG		 788
789static void addrconf_linkdown_change(struct net *net, __s32 newf)
790{
791 struct net_device *dev;
792 struct inet6_dev *idev;
793
794 for_each_netdev(net, dev) {
795 idev = __in6_dev_get(dev);
796 if (idev) {
797 int changed = (!idev->cnf.ignore_routes_with_linkdown) ^ (!newf);
798
799 idev->cnf.ignore_routes_with_linkdown = newf;
800 if (changed)
801 inet6_netconf_notify_devconf(dev_net(dev),
802 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
803 dev->ifindex,
804 &idev->cnf);
805 }
806 }
807}
808
809static int addrconf_fixup_linkdown(struct ctl_table *table, int *p, int newf)
810{
811 struct net *net;
812 int old;
813
814 if (!rtnl_trylock())
815 return restart_syscall();
816
817 net = (struct net *)table->extra2;
818 old = *p;
819 *p = newf;
820
821 if (p == &net->ipv6.devconf_dflt->ignore_routes_with_linkdown) {
822 if ((!newf) ^ (!old))
823 inet6_netconf_notify_devconf(net,
824 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
825 NETCONFA_IFINDEX_DEFAULT,
826 net->ipv6.devconf_dflt);
827 rtnl_unlock();
828 return 0;
829 }
830
831 if (p == &net->ipv6.devconf_all->ignore_routes_with_linkdown) {
832 net->ipv6.devconf_dflt->ignore_routes_with_linkdown = newf;
833 addrconf_linkdown_change(net, newf);
834 if ((!newf) ^ (!old))
835 inet6_netconf_notify_devconf(net,
836 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
837 NETCONFA_IFINDEX_ALL,
838 net->ipv6.devconf_all);
839 }
840 rtnl_unlock();
841
842 return 1;
843}
844
1da177e4
LT		 845#endif
846
5c578aed 847/* Nobody refers to this ifaddr, destroy it */
1da177e4
LT		 848void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
849{
c2e21293 850 WARN_ON(!hlist_unhashed(&ifp->addr_lst));
547b792c 851
1da177e4 852#ifdef NET_REFCNT_DEBUG
91df42be 853 pr_debug("%s\n", __func__);
1da177e4
LT		 854#endif
855
856 in6_dev_put(ifp->idev);
857
c15b1cca
HFS		 858 if (cancel_delayed_work(&ifp->dad_work))
859 pr_notice("delayed DAD work was pending while freeing ifa=%p\n",
860 ifp);
1da177e4 861
e9d3e084 862 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
f3213831 863 pr_warn("Freeing alive inet6 address %p\n", ifp);
1da177e4
LT		 864 return;
865 }
94e187c0 866 ip6_rt_put(ifp->rt);
1da177e4 867
e5785985 868 kfree_rcu(ifp, rcu);
1da177e4
LT		 869}
870
e55ffac6
BH		 871static void
872ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
873{
502a2ffd 874 struct list_head *p;
8a6ce0c0 875 int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
e55ffac6
BH		 876
877 /*
878 * Each device address list is sorted in order of scope -
879 * global before linklocal.
880 */
502a2ffd 881 list_for_each(p, &idev->addr_list) {
882 struct inet6_ifaddr *ifa
883 = list_entry(p, struct inet6_ifaddr, if_list);
8a6ce0c0 884 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
e55ffac6
BH		 885 break;
886 }
887
b54c9b98 888 list_add_tail(&ifp->if_list, p);
e55ffac6
BH		 889}
890
ddbe5032 891static u32 inet6_addr_hash(const struct in6_addr *addr)
3eb84f49 892{
ddbe5032 893 return hash_32(ipv6_addr_hash(addr), IN6_ADDR_HSIZE_SHIFT);
3eb84f49
YH		 894}
895
1da177e4
LT		 896/* On success it returns ifp with increased reference count */
897
898static struct inet6_ifaddr *
3f8f5298
JP		 899ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
900 const struct in6_addr *peer_addr, int pfxlen,
8a226b2c 901 int scope, u32 flags, u32 valid_lft, u32 prefered_lft)
1da177e4
LT		 902{
903 struct inet6_ifaddr *ifa = NULL;
904 struct rt6_info *rt;
3a88a81d 905 unsigned int hash;
1da177e4 906 int err = 0;
d68b8270
YH		 907 int addr_type = ipv6_addr_type(addr);
908
909 if (addr_type == IPV6_ADDR_ANY ||
910 addr_type & IPV6_ADDR_MULTICAST ||
911 (!(idev->dev->flags & IFF_LOOPBACK) &&
912 addr_type & IPV6_ADDR_LOOPBACK))
913 return ERR_PTR(-EADDRNOTAVAIL);
1da177e4 914
8814c4b5 915 rcu_read_lock_bh();
1da177e4
LT		 916 if (idev->dead) {
917 err = -ENODEV; /*XXX*/
918 goto out2;
919 }
920
56d417b1 921 if (idev->cnf.disable_ipv6) {
9bdd8d40
BH		 922 err = -EACCES;
923 goto out2;
924 }
925
5c578aed 926 spin_lock(&addrconf_hash_lock);
1da177e4
LT		 927
928 /* Ignore adding duplicate addresses on an interface */
c346dca1 929 if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) {
ba3542e1 930 ADBG("ipv6_add_addr: already assigned\n");
1da177e4
LT		 931 err = -EEXIST;
932 goto out;
933 }
934
322f74a4 935 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
1da177e4 936
63159f29 937 if (!ifa) {
ba3542e1 938 ADBG("ipv6_add_addr: malloc failed\n");
1da177e4
LT		 939 err = -ENOBUFS;
940 goto out;
941 }
942
8f031519 943 rt = addrconf_dst_alloc(idev, addr, false);
1da177e4
LT		 944 if (IS_ERR(rt)) {
945 err = PTR_ERR(rt);
946 goto out;
947 }
948
bba24896
JP		 949 neigh_parms_data_state_setall(idev->nd_parms);
950
4e3fd7a0 951 ifa->addr = *addr;
3f8f5298
JP		 952 if (peer_addr)
953 ifa->peer_addr = *peer_addr;
1da177e4
LT		 954
955 spin_lock_init(&ifa->lock);
c15b1cca 956 INIT_DELAYED_WORK(&ifa->dad_work, addrconf_dad_work);
c2e21293 957 INIT_HLIST_NODE(&ifa->addr_lst);
1da177e4
LT		 958 ifa->scope = scope;
959 ifa->prefix_len = pfxlen;
960 ifa->flags = flags | IFA_F_TENTATIVE;
8a226b2c
JB		 961 ifa->valid_lft = valid_lft;
962 ifa->prefered_lft = prefered_lft;
1da177e4 963 ifa->cstamp = ifa->tstamp = jiffies;
617fe29d 964 ifa->tokenized = false;
1da177e4 965
57f5f544
KF		 966 ifa->rt = rt;
967
1da177e4
LT		 968 ifa->idev = idev;
969 in6_dev_hold(idev);
970 /* For caller */
971 in6_ifa_hold(ifa);
972
973 /* Add to big hash table */
ddbe5032 974 hash = inet6_addr_hash(addr);
1da177e4 975
5c578aed 976 hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]);
5c578aed 977 spin_unlock(&addrconf_hash_lock);
1da177e4
LT		 978
979 write_lock(&idev->lock);
980 /* Add to inet6_dev unicast addr list. */
e55ffac6 981 ipv6_link_dev_addr(idev, ifa);
1da177e4 982
1da177e4 983 if (ifa->flags&IFA_F_TEMPORARY) {
372e6c8f 984 list_add(&ifa->tmp_list, &idev->tempaddr_list);
1da177e4
LT		 985 in6_ifa_hold(ifa);
986 }
1da177e4 987
1da177e4
LT		 988 in6_ifa_hold(ifa);
989 write_unlock(&idev->lock);
990out2:
8814c4b5 991 rcu_read_unlock_bh();
1da177e4 992
fd92833a 993 if (likely(err == 0))
f88c91dd 994 inet6addr_notifier_call_chain(NETDEV_UP, ifa);
1da177e4
LT		 995 else {
996 kfree(ifa);
997 ifa = ERR_PTR(err);
998 }
999
1000 return ifa;
1001out:
5c578aed 1002 spin_unlock(&addrconf_hash_lock);
1da177e4
LT		 1003 goto out2;
1004}
1005
5b84efec
TH		 1006enum cleanup_prefix_rt_t {
1007 CLEANUP_PREFIX_RT_NOP, /* no cleanup action for prefix route */
1008 CLEANUP_PREFIX_RT_DEL, /* delete the prefix route */
1009 CLEANUP_PREFIX_RT_EXPIRE, /* update the lifetime of the prefix route */
1010};
1011
1012/*
1013 * Check, whether the prefix for ifp would still need a prefix route
1014 * after deleting ifp. The function returns one of the CLEANUP_PREFIX_RT_*
1015 * constants.
1016 *
1017 * 1) we don't purge prefix if address was not permanent.
1018 * prefix is managed by its own lifetime.
1019 * 2) we also don't purge, if the address was IFA_F_NOPREFIXROUTE.
1020 * 3) if there are no addresses, delete prefix.
1021 * 4) if there are still other permanent address(es),
1022 * corresponding prefix is still permanent.
1023 * 5) if there are still other addresses with IFA_F_NOPREFIXROUTE,
1024 * don't purge the prefix, assume user space is managing it.
1025 * 6) otherwise, update prefix lifetime to the
1026 * longest valid lifetime among the corresponding
1027 * addresses on the device.
1028 * Note: subsequent RA will update lifetime.
1029 **/
1030static enum cleanup_prefix_rt_t
1031check_cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long *expires)
1032{
1033 struct inet6_ifaddr *ifa;
1034 struct inet6_dev *idev = ifp->idev;
1035 unsigned long lifetime;
1036 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_DEL;
1037
1038 *expires = jiffies;
1039
1040 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1041 if (ifa == ifp)
1042 continue;
1043 if (!ipv6_prefix_equal(&ifa->addr, &ifp->addr,
1044 ifp->prefix_len))
1045 continue;
1046 if (ifa->flags & (IFA_F_PERMANENT | IFA_F_NOPREFIXROUTE))
1047 return CLEANUP_PREFIX_RT_NOP;
1048
1049 action = CLEANUP_PREFIX_RT_EXPIRE;
1050
1051 spin_lock(&ifa->lock);
1052
1053 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
1054 /*
1055 * Note: Because this address is
1056 * not permanent, lifetime <
1057 * LONG_MAX / HZ here.
1058 */
1059 if (time_before(*expires, ifa->tstamp + lifetime * HZ))
1060 *expires = ifa->tstamp + lifetime * HZ;
1061 spin_unlock(&ifa->lock);
1062 }
1063
1064 return action;
1065}
1066
1067static void
1068cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long expires, bool del_rt)
1069{
1070 struct rt6_info *rt;
1071
1072 rt = addrconf_get_prefix_route(&ifp->addr,
1073 ifp->prefix_len,
1074 ifp->idev->dev,
1075 0, RTF_GATEWAY | RTF_DEFAULT);
1076 if (rt) {
1077 if (del_rt)
1078 ip6_del_rt(rt);
1079 else {
1080 if (!(rt->rt6i_flags & RTF_EXPIRES))
1081 rt6_set_expires(rt, expires);
1082 ip6_rt_put(rt);
1083 }
1084 }
1085}
1086
1087
1da177e4
LT		 1088/* This function wants to get referenced ifp and releases it before return */
1089
1090static void ipv6_del_addr(struct inet6_ifaddr *ifp)
1091{
4c5ff6a6 1092 int state;
5b84efec
TH		 1093 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_NOP;
1094 unsigned long expires;
1da177e4 1095
c15b1cca
HFS		 1096 ASSERT_RTNL();
1097
8e8e676d 1098 spin_lock_bh(&ifp->lock);
4c5ff6a6 1099 state = ifp->state;
e9d3e084 1100 ifp->state = INET6_IFADDR_STATE_DEAD;
8e8e676d 1101 spin_unlock_bh(&ifp->lock);
4c5ff6a6
HX		 1102
1103 if (state == INET6_IFADDR_STATE_DEAD)
1104 goto out;
1da177e4 1105
5c578aed 1106 spin_lock_bh(&addrconf_hash_lock);
1107 hlist_del_init_rcu(&ifp->addr_lst);
5c578aed 1108 spin_unlock_bh(&addrconf_hash_lock);
1da177e4 1109
5b84efec 1110 write_lock_bh(&ifp->idev->lock);
5d9efa7e 1111
1da177e4 1112 if (ifp->flags&IFA_F_TEMPORARY) {
372e6c8f 1113 list_del(&ifp->tmp_list);
1114 if (ifp->ifpub) {
1115 in6_ifa_put(ifp->ifpub);
1116 ifp->ifpub = NULL;
1da177e4 1117 }
372e6c8f 1118 __in6_ifa_put(ifp);
1da177e4 1119 }
1da177e4 1120
5b84efec
TH		 1121 if (ifp->flags & IFA_F_PERMANENT && !(ifp->flags & IFA_F_NOPREFIXROUTE))
1122 action = check_cleanup_prefix_route(ifp, &expires);
502a2ffd 1123
5b84efec
TH		 1124 list_del_init(&ifp->if_list);
1125 __in6_ifa_put(ifp);
1126
1127 write_unlock_bh(&ifp->idev->lock);
1da177e4 1128
c15b1cca 1129 addrconf_del_dad_work(ifp);
b2238566 1130
1da177e4
LT		 1131 ipv6_ifa_notify(RTM_DELADDR, ifp);
1132
f88c91dd 1133 inet6addr_notifier_call_chain(NETDEV_DOWN, ifp);
1da177e4 1134
5b84efec
TH		 1135 if (action != CLEANUP_PREFIX_RT_NOP) {
1136 cleanup_prefix_route(ifp, expires,
1137 action == CLEANUP_PREFIX_RT_DEL);
1da177e4
LT		 1138 }
1139
c3968a85
DW		 1140 /* clean up prefsrc entries */
1141 rt6_remove_prefsrc(ifp);
4c5ff6a6 1142out:
1da177e4
LT		 1143 in6_ifa_put(ifp);
1144}
1145
1da177e4
LT		 1146static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
1147{
1148 struct inet6_dev *idev = ifp->idev;
1149 struct in6_addr addr, *tmpaddr;
76f793e3 1150 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_tstamp, age;
eac55bf9 1151 unsigned long regen_advance;
1da177e4
LT		 1152 int tmp_plen;
1153 int ret = 0;
95c385b4 1154 u32 addr_flags;
76f793e3 1155 unsigned long now = jiffies;
1da177e4 1156
53bd6749 1157 write_lock_bh(&idev->lock);
1da177e4
LT		 1158 if (ift) {
1159 spin_lock_bh(&ift->lock);
1160 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
1161 spin_unlock_bh(&ift->lock);
1162 tmpaddr = &addr;
1163 } else {
1164 tmpaddr = NULL;
1165 }
1166retry:
1167 in6_dev_hold(idev);
1168 if (idev->cnf.use_tempaddr <= 0) {
53bd6749 1169 write_unlock_bh(&idev->lock);
f3213831 1170 pr_info("%s: use_tempaddr is disabled\n", __func__);
1da177e4
LT		 1171 in6_dev_put(idev);
1172 ret = -1;
1173 goto out;
1174 }
1175 spin_lock_bh(&ifp->lock);
1176 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
1177 idev->cnf.use_tempaddr = -1; /*XXX*/
1178 spin_unlock_bh(&ifp->lock);
53bd6749 1179 write_unlock_bh(&idev->lock);
f3213831
JP		 1180 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n",
1181 __func__);
1da177e4
LT		 1182 in6_dev_put(idev);
1183 ret = -1;
1184 goto out;
1185 }
1186 in6_ifa_hold(ifp);
1187 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
eb7e0575 1188 __ipv6_try_regen_rndid(idev, tmpaddr);
1da177e4 1189 memcpy(&addr.s6_addr[8], idev->rndid, 8);
76f793e3 1190 age = (now - ifp->tstamp) / HZ;
1da177e4
LT		 1191 tmp_valid_lft = min_t(__u32,
1192 ifp->valid_lft,
7a876b0e 1193 idev->cnf.temp_valid_lft + age);
1ab1457c
YH		 1194 tmp_prefered_lft = min_t(__u32,
1195 ifp->prefered_lft,
7a876b0e 1196 idev->cnf.temp_prefered_lft + age -
784e2710 1197 idev->cnf.max_desync_factor);
1da177e4 1198 tmp_plen = ifp->prefix_len;
1da177e4
LT		 1199 tmp_tstamp = ifp->tstamp;
1200 spin_unlock_bh(&ifp->lock);
1201
eac55bf9 1202 regen_advance = idev->cnf.regen_max_retry *
67ba4152
IM		 1203 idev->cnf.dad_transmits *
1204 NEIGH_VAR(idev->nd_parms, RETRANS_TIME) / HZ;
53bd6749 1205 write_unlock_bh(&idev->lock);
95c385b4 1206
eac55bf9
BB		 1207 /* A temporary address is created only if this calculated Preferred
1208 * Lifetime is greater than REGEN_ADVANCE time units. In particular,
1209 * an implementation must not create a temporary address with a zero
1210 * Preferred Lifetime.
ecab6701
HK		 1211 * Use age calculation as in addrconf_verify to avoid unnecessary
1212 * temporary addresses being generated.
eac55bf9 1213 */
ecab6701
HK		 1214 age = (now - tmp_tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
1215 if (tmp_prefered_lft <= regen_advance + age) {
eac55bf9
BB		 1216 in6_ifa_put(ifp);
1217 in6_dev_put(idev);
1218 ret = -1;
1219 goto out;
1220 }
1221
95c385b4
NH		 1222 addr_flags = IFA_F_TEMPORARY;
1223 /* set in addrconf_prefix_rcv() */
1224 if (ifp->flags & IFA_F_OPTIMISTIC)
1225 addr_flags |= IFA_F_OPTIMISTIC;
1226
4b08a8f1
HFS		 1227 ift = ipv6_add_addr(idev, &addr, NULL, tmp_plen,
1228 ipv6_addr_scope(&addr), addr_flags,
1229 tmp_valid_lft, tmp_prefered_lft);
1230 if (IS_ERR(ift)) {
1da177e4
LT		 1231 in6_ifa_put(ifp);
1232 in6_dev_put(idev);
f3213831 1233 pr_info("%s: retry temporary address regeneration\n", __func__);
1da177e4 1234 tmpaddr = &addr;
53bd6749 1235 write_lock_bh(&idev->lock);
1da177e4
LT		 1236 goto retry;
1237 }
1238
1239 spin_lock_bh(&ift->lock);
1240 ift->ifpub = ifp;
76f793e3 1241 ift->cstamp = now;
1da177e4
LT		 1242 ift->tstamp = tmp_tstamp;
1243 spin_unlock_bh(&ift->lock);
1244
cf22f9a2 1245 addrconf_dad_start(ift);
1da177e4
LT		 1246 in6_ifa_put(ift);
1247 in6_dev_put(idev);
1248out:
1249 return ret;
1250}
1da177e4
LT		 1251
1252/*
072047e4 1253 * Choose an appropriate source address (RFC3484)
1da177e4 1254 */
a9b05723
YH		 1255enum {
1256 IPV6_SADDR_RULE_INIT = 0,
1257 IPV6_SADDR_RULE_LOCAL,
1258 IPV6_SADDR_RULE_SCOPE,
1259 IPV6_SADDR_RULE_PREFERRED,
1260#ifdef CONFIG_IPV6_MIP6
1261 IPV6_SADDR_RULE_HOA,
1262#endif
1263 IPV6_SADDR_RULE_OIF,
1264 IPV6_SADDR_RULE_LABEL,
a9b05723 1265 IPV6_SADDR_RULE_PRIVACY,
a9b05723
YH		 1266 IPV6_SADDR_RULE_ORCHID,
1267 IPV6_SADDR_RULE_PREFIX,
7fd2561e
EK		 1268#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1269 IPV6_SADDR_RULE_NOT_OPTIMISTIC,
1270#endif
a9b05723
YH		 1271 IPV6_SADDR_RULE_MAX
1272};
1273
072047e4 1274struct ipv6_saddr_score {
a9b05723
YH		 1275 int rule;
1276 int addr_type;
1277 struct inet6_ifaddr *ifa;
1278 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
1279 int scopedist;
1280 int matchlen;
072047e4
YH		 1281};
1282
a9b05723 1283struct ipv6_saddr_dst {
9acd9f3a 1284 const struct in6_addr *addr;
a9b05723
YH		 1285 int ifindex;
1286 int scope;
1287 int label;
7cbca67c 1288 unsigned int prefs;
a9b05723 1289};
072047e4 1290
b6f99a21 1291static inline int ipv6_saddr_preferred(int type)
1da177e4 1292{
45bb0060 1293 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
072047e4
YH		 1294 return 1;
1295 return 0;
1da177e4
LT		 1296}
1297
7fd2561e
EK		 1298static inline bool ipv6_use_optimistic_addr(struct inet6_dev *idev)
1299{
1300#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1301 return idev && idev->cnf.optimistic_dad && idev->cnf.use_optimistic;
1302#else
1303 return false;
1304#endif
1305}
1306
3de23255
BT		 1307static int ipv6_get_saddr_eval(struct net *net,
1308 struct ipv6_saddr_score *score,
a9b05723
YH		 1309 struct ipv6_saddr_dst *dst,
1310 int i)
1311{
1312 int ret;
1313
1314 if (i <= score->rule) {
1315 switch (i) {
1316 case IPV6_SADDR_RULE_SCOPE:
1317 ret = score->scopedist;
1318 break;
1319 case IPV6_SADDR_RULE_PREFIX:
1320 ret = score->matchlen;
1321 break;
1322 default:
1323 ret = !!test_bit(i, score->scorebits);
1324 }
1325 goto out;
1326 }
1327
1328 switch (i) {
1329 case IPV6_SADDR_RULE_INIT:
1330 /* Rule 0: remember if hiscore is not ready yet */
1331 ret = !!score->ifa;
1332 break;
1333 case IPV6_SADDR_RULE_LOCAL:
1334 /* Rule 1: Prefer same address */
1335 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1336 break;
1337 case IPV6_SADDR_RULE_SCOPE:
1338 /* Rule 2: Prefer appropriate scope
1339 *
1340 * ret
1341 * ^
1342 * -1 | d 15
1343 * ---+--+-+---> scope
1344 * |
1345 * | d is scope of the destination.
1346 * B-d | \
1347 * | \ <- smaller scope is better if
db9c7c39 1348 * B-15 | \ if scope is enough for destination.
a9b05723
YH		 1349 * | ret = B - scope (-1 <= scope >= d <= 15).
1350 * d-C-1 | /
1351 * |/ <- greater is better
1352 * -C / if scope is not enough for destination.
1353 * /| ret = scope - C (-1 <= d < scope <= 15).
1354 *
1355 * d - C - 1 < B -15 (for all -1 <= d <= 15).
1356 * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1357 * Assume B = 0 and we get C > 29.
1358 */
1359 ret = __ipv6_addr_src_scope(score->addr_type);
1360 if (ret >= dst->scope)
1361 ret = -ret;
1362 else
1363 ret -= 128; /* 30 is enough */
1364 score->scopedist = ret;
1365 break;
1366 case IPV6_SADDR_RULE_PREFERRED:
7fd2561e 1367 {
a9b05723 1368 /* Rule 3: Avoid deprecated and optimistic addresses */
7fd2561e
EK		 1369 u8 avoid = IFA_F_DEPRECATED;
1370
1371 if (!ipv6_use_optimistic_addr(score->ifa->idev))
1372 avoid |= IFA_F_OPTIMISTIC;
a9b05723 1373 ret = ipv6_saddr_preferred(score->addr_type) ||
7fd2561e 1374 !(score->ifa->flags & avoid);
a9b05723 1375 break;
7fd2561e 1376 }
a9b05723
YH		 1377#ifdef CONFIG_IPV6_MIP6
1378 case IPV6_SADDR_RULE_HOA:
7cbca67c 1379 {
a9b05723 1380 /* Rule 4: Prefer home address */
7cbca67c
YH		 1381 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1382 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
a9b05723 1383 break;
7cbca67c 1384 }
a9b05723
YH		 1385#endif
1386 case IPV6_SADDR_RULE_OIF:
1387 /* Rule 5: Prefer outgoing interface */
1388 ret = (!dst->ifindex ||
1389 dst->ifindex == score->ifa->idev->dev->ifindex);
1390 break;
1391 case IPV6_SADDR_RULE_LABEL:
1392 /* Rule 6: Prefer matching label */
3de23255
BT		 1393 ret = ipv6_addr_label(net,
1394 &score->ifa->addr, score->addr_type,
a9b05723
YH		 1395 score->ifa->idev->dev->ifindex) == dst->label;
1396 break;
a9b05723 1397 case IPV6_SADDR_RULE_PRIVACY:
7cbca67c 1398 {
a9b05723 1399 /* Rule 7: Prefer public address
25985edc 1400 * Note: prefer temporary address if use_tempaddr >= 2
a9b05723 1401 */
7cbca67c
YH		 1402 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1403 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1404 score->ifa->idev->cnf.use_tempaddr >= 2;
1405 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
a9b05723 1406 break;
7cbca67c 1407 }
a9b05723
YH		 1408 case IPV6_SADDR_RULE_ORCHID:
1409 /* Rule 8-: Prefer ORCHID vs ORCHID or
1410 * non-ORCHID vs non-ORCHID
1411 */
1412 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1413 ipv6_addr_orchid(dst->addr));
1414 break;
1415 case IPV6_SADDR_RULE_PREFIX:
1416 /* Rule 8: Use longest matching prefix */
91b4b04f
YH		 1417 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr);
1418 if (ret > score->ifa->prefix_len)
1419 ret = score->ifa->prefix_len;
1420 score->matchlen = ret;
a9b05723 1421 break;
7fd2561e
EK		 1422#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1423 case IPV6_SADDR_RULE_NOT_OPTIMISTIC:
1424 /* Optimistic addresses still have lower precedence than other
1425 * preferred addresses.
1426 */
1427 ret = !(score->ifa->flags & IFA_F_OPTIMISTIC);
1428 break;
1429#endif
a9b05723
YH		 1430 default:
1431 ret = 0;
1432 }
1433
1434 if (ret)
1435 __set_bit(i, score->scorebits);
1436 score->rule = i;
1437out:
1438 return ret;
1439}
1440
c0b8da1e
YH		 1441static int __ipv6_dev_get_saddr(struct net *net,
1442 struct ipv6_saddr_dst *dst,
c0b8da1e
YH		 1443 struct inet6_dev *idev,
1444 struct ipv6_saddr_score *scores,
1445 int hiscore_idx)
9131f3de 1446{
c0b8da1e 1447 struct ipv6_saddr_score *score = &scores[1 - hiscore_idx], *hiscore = &scores[hiscore_idx];
9131f3de
YH		 1448
1449 read_lock_bh(&idev->lock);
1450 list_for_each_entry(score->ifa, &idev->addr_list, if_list) {
1451 int i;
1452
1453 /*
1454 * - Tentative Address (RFC2462 section 5.4)
1455 * - A tentative address is not considered
1456 * "assigned to an interface" in the traditional
1457 * sense, unless it is also flagged as optimistic.
1458 * - Candidate Source Address (section 4)
1459 * - In any case, anycast addresses, multicast
1460 * addresses, and the unspecified address MUST
1461 * NOT be included in a candidate set.
1462 */
1463 if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1464 (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
1465 continue;
1466
1467 score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1468
1469 if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1470 score->addr_type & IPV6_ADDR_MULTICAST)) {
1471 net_dbg_ratelimited("ADDRCONF: unspecified / multicast address assigned as unicast address on %s",
1472 idev->dev->name);
1473 continue;
1474 }
1475
1476 score->rule = -1;
1477 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1478
1479 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1480 int minihiscore, miniscore;
1481
1482 minihiscore = ipv6_get_saddr_eval(net, hiscore, dst, i);
1483 miniscore = ipv6_get_saddr_eval(net, score, dst, i);
1484
1485 if (minihiscore > miniscore) {
1486 if (i == IPV6_SADDR_RULE_SCOPE &&
1487 score->scopedist > 0) {
1488 /*
1489 * special case:
1490 * each remaining entry
1491 * has too small (not enough)
1492 * scope, because ifa entries
1493 * are sorted by their scope
1494 * values.
1495 */
1496 goto out;
1497 }
1498 break;
1499 } else if (minihiscore < miniscore) {
1500 if (hiscore->ifa)
1501 in6_ifa_put(hiscore->ifa);
1502
1503 in6_ifa_hold(score->ifa);
1504
1505 swap(hiscore, score);
c0b8da1e 1506 hiscore_idx = 1 - hiscore_idx;
9131f3de
YH		 1507
1508 /* restore our iterator */
1509 score->ifa = hiscore->ifa;
1510
1511 break;
1512 }
1513 }
1514 }
1515out:
1516 read_unlock_bh(&idev->lock);
c0b8da1e 1517 return hiscore_idx;
9131f3de
YH		 1518}
1519
b3f644fc 1520int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev,
9acd9f3a 1521 const struct in6_addr *daddr, unsigned int prefs,
7cbca67c 1522 struct in6_addr *saddr)
1da177e4 1523{
c0b8da1e 1524 struct ipv6_saddr_score scores[2], *hiscore;
a9b05723 1525 struct ipv6_saddr_dst dst;
9131f3de 1526 struct inet6_dev *idev;
072047e4 1527 struct net_device *dev;
a9b05723 1528 int dst_type;
9131f3de 1529 bool use_oif_addr = false;
c0b8da1e 1530 int hiscore_idx = 0;
1da177e4 1531
a9b05723
YH		 1532 dst_type = __ipv6_addr_type(daddr);
1533 dst.addr = daddr;
1534 dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1535 dst.scope = __ipv6_addr_src_scope(dst_type);
3de23255 1536 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
7cbca67c 1537 dst.prefs = prefs;
a9b05723 1538
c0b8da1e
YH		 1539 scores[hiscore_idx].rule = -1;
1540 scores[hiscore_idx].ifa = NULL;
1da177e4 1541
8814c4b5 1542 rcu_read_lock();
1da177e4 1543
9131f3de
YH		 1544 /* Candidate Source Address (section 4)
1545 * - multicast and link-local destination address,
1546 * the set of candidate source address MUST only
1547 * include addresses assigned to interfaces
1548 * belonging to the same link as the outgoing
1549 * interface.
1550 * (- For site-local destination addresses, the
1551 * set of candidate source addresses MUST only
1552 * include addresses assigned to interfaces
1553 * belonging to the same site as the outgoing
1554 * interface.)
3985e8a3
EK		 1555 * - "It is RECOMMENDED that the candidate source addresses
1556 * be the set of unicast addresses assigned to the
1557 * interface that will be used to send to the destination
1558 * (the 'outgoing' interface)." (RFC 6724)
9131f3de
YH		 1559 */
1560 if (dst_dev) {
3985e8a3 1561 idev = __in6_dev_get(dst_dev);
9131f3de 1562 if ((dst_type & IPV6_ADDR_MULTICAST) ||
3985e8a3
EK		 1563 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL ||
1564 (idev && idev->cnf.use_oif_addrs_only)) {
9131f3de
YH		 1565 use_oif_addr = true;
1566 }
1567 }
a9b05723 1568
9131f3de 1569 if (use_oif_addr) {
c0b8da1e 1570 if (idev)
c15df306 1571 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx);
9131f3de
YH		 1572 } else {
1573 for_each_netdev_rcu(net, dev) {
1574 idev = __in6_dev_get(dev);
1575 if (!idev)
072047e4 1576 continue;
c15df306 1577 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx);
1da177e4
LT		 1578 }
1579 }
8814c4b5 1580 rcu_read_unlock();
1da177e4 1581
c0b8da1e 1582 hiscore = &scores[hiscore_idx];
a9b05723 1583 if (!hiscore->ifa)
072047e4 1584 return -EADDRNOTAVAIL;
1ab1457c 1585
4e3fd7a0 1586 *saddr = hiscore->ifa->addr;
a9b05723 1587 in6_ifa_put(hiscore->ifa);
072047e4 1588 return 0;
1da177e4 1589}
5e5f3f0f 1590EXPORT_SYMBOL(ipv6_dev_get_saddr);
1da177e4 1591
8965779d 1592int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr,
479840ff 1593 u32 banned_flags)
b7b1bfce
HFS		 1594{
1595 struct inet6_ifaddr *ifp;
1596 int err = -EADDRNOTAVAIL;
1597
602582ca
HFS		 1598 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
1599 if (ifp->scope > IFA_LINK)
1600 break;
b7b1bfce
HFS		 1601 if (ifp->scope == IFA_LINK &&
1602 !(ifp->flags & banned_flags)) {
1603 *addr = ifp->addr;
1604 err = 0;
1605 break;
1606 }
1607 }
1608 return err;
1609}
1610
95c385b4 1611int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
479840ff 1612 u32 banned_flags)
1da177e4
LT		 1613{
1614 struct inet6_dev *idev;
1615 int err = -EADDRNOTAVAIL;
1616
8814c4b5 1617 rcu_read_lock();
e21e8467
SH		 1618 idev = __in6_dev_get(dev);
1619 if (idev) {
1da177e4 1620 read_lock_bh(&idev->lock);
b7b1bfce 1621 err = __ipv6_get_lladdr(idev, addr, banned_flags);
1da177e4
LT		 1622 read_unlock_bh(&idev->lock);
1623 }
8814c4b5 1624 rcu_read_unlock();
1da177e4
LT		 1625 return err;
1626}
1627
1628static int ipv6_count_addresses(struct inet6_dev *idev)
1629{
1630 int cnt = 0;
1631 struct inet6_ifaddr *ifp;
1632
1633 read_lock_bh(&idev->lock);
502a2ffd 1634 list_for_each_entry(ifp, &idev->addr_list, if_list)
1da177e4
LT		 1635 cnt++;
1636 read_unlock_bh(&idev->lock);
1637 return cnt;
1638}
1639
b71d1d42 1640int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
2a7851bf 1641 const struct net_device *dev, int strict)
c58da4c6
EK		 1642{
1643 return ipv6_chk_addr_and_flags(net, addr, dev, strict, IFA_F_TENTATIVE);
1644}
1645EXPORT_SYMBOL(ipv6_chk_addr);
1646
1647int ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr,
1648 const struct net_device *dev, int strict,
1649 u32 banned_flags)
1da177e4 1650{
eedf042a 1651 struct inet6_ifaddr *ifp;
ddbe5032 1652 unsigned int hash = inet6_addr_hash(addr);
c58da4c6 1653 u32 ifp_flags;
1da177e4 1654
5c578aed 1655 rcu_read_lock_bh();
b67bfe0d 1656 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
878628fb 1657 if (!net_eq(dev_net(ifp->idev->dev), net))
bfeade08 1658 continue;
c58da4c6
EK		 1659 /* Decouple optimistic from tentative for evaluation here.
1660 * Ban optimistic addresses explicitly, when required.
1661 */
1662 ifp_flags = (ifp->flags&IFA_F_OPTIMISTIC)
1663 ? (ifp->flags&~IFA_F_TENTATIVE)
1664 : ifp->flags;
1da177e4 1665 if (ipv6_addr_equal(&ifp->addr, addr) &&
c58da4c6 1666 !(ifp_flags&banned_flags) &&
63159f29 1667 (!dev || ifp->idev->dev == dev ||
eedf042a
SH		 1668 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) {
1669 rcu_read_unlock_bh();
1670 return 1;
1da177e4
LT		 1671 }
1672 }
5c578aed 1673
eedf042a
SH		 1674 rcu_read_unlock_bh();
1675 return 0;
1da177e4 1676}
c58da4c6 1677EXPORT_SYMBOL(ipv6_chk_addr_and_flags);
7159039a 1678
3e81c6da
DM		 1679static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1680 struct net_device *dev)
1da177e4 1681{
ddbe5032 1682 unsigned int hash = inet6_addr_hash(addr);
c2e21293 1683 struct inet6_ifaddr *ifp;
1da177e4 1684
b67bfe0d 1685 hlist_for_each_entry(ifp, &inet6_addr_lst[hash], addr_lst) {
878628fb 1686 if (!net_eq(dev_net(ifp->idev->dev), net))
06bfe655 1687 continue;
1da177e4 1688 if (ipv6_addr_equal(&ifp->addr, addr)) {
63159f29 1689 if (!dev || ifp->idev->dev == dev)
3e81c6da 1690 return true;
1da177e4
LT		 1691 }
1692 }
3e81c6da 1693 return false;
1da177e4
LT		 1694}
1695
7df37ff3
CB		 1696/* Compares an address/prefix_len with addresses on device @dev.
1697 * If one is found it returns true.
1698 */
1699bool ipv6_chk_custom_prefix(const struct in6_addr *addr,
1700 const unsigned int prefix_len, struct net_device *dev)
1701{
1702 struct inet6_dev *idev;
1703 struct inet6_ifaddr *ifa;
1704 bool ret = false;
1705
1706 rcu_read_lock();
1707 idev = __in6_dev_get(dev);
1708 if (idev) {
1709 read_lock_bh(&idev->lock);
1710 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1711 ret = ipv6_prefix_equal(addr, &ifa->addr, prefix_len);
1712 if (ret)
1713 break;
1714 }
1715 read_unlock_bh(&idev->lock);
1716 }
1717 rcu_read_unlock();
1718
1719 return ret;
1720}
1721EXPORT_SYMBOL(ipv6_chk_custom_prefix);
1722
b71d1d42 1723int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev)
52eeeb84
YH		 1724{
1725 struct inet6_dev *idev;
1726 struct inet6_ifaddr *ifa;
1727 int onlink;
1728
1729 onlink = 0;
1730 rcu_read_lock();
1731 idev = __in6_dev_get(dev);
1732 if (idev) {
1733 read_lock_bh(&idev->lock);
502a2ffd 1734 list_for_each_entry(ifa, &idev->addr_list, if_list) {
52eeeb84
YH		 1735 onlink = ipv6_prefix_equal(addr, &ifa->addr,
1736 ifa->prefix_len);
1737 if (onlink)
1738 break;
1739 }
1740 read_unlock_bh(&idev->lock);
1741 }
1742 rcu_read_unlock();
1743 return onlink;
1744}
52eeeb84
YH		 1745EXPORT_SYMBOL(ipv6_chk_prefix);
1746
9acd9f3a 1747struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1cab3da6 1748 struct net_device *dev, int strict)
1da177e4 1749{
b79d1d54 1750 struct inet6_ifaddr *ifp, *result = NULL;
ddbe5032 1751 unsigned int hash = inet6_addr_hash(addr);
1da177e4 1752
5c578aed 1753 rcu_read_lock_bh();
b67bfe0d 1754 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
878628fb 1755 if (!net_eq(dev_net(ifp->idev->dev), net))
1cab3da6 1756 continue;
1da177e4 1757 if (ipv6_addr_equal(&ifp->addr, addr)) {
63159f29 1758 if (!dev || ifp->idev->dev == dev ||
1da177e4 1759 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
b79d1d54 1760 result = ifp;
1da177e4
LT		 1761 in6_ifa_hold(ifp);
1762 break;
1763 }
1764 }
1765 }
5c578aed 1766 rcu_read_unlock_bh();
1da177e4 1767
b79d1d54 1768 return result;
1da177e4
LT		 1769}
1770
1da177e4
LT		 1771/* Gets referenced address, destroys ifaddr */
1772
cc411d0b 1773static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
1da177e4 1774{
1da177e4
LT		 1775 if (ifp->flags&IFA_F_PERMANENT) {
1776 spin_lock_bh(&ifp->lock);
c15b1cca 1777 addrconf_del_dad_work(ifp);
1da177e4 1778 ifp->flags |= IFA_F_TENTATIVE;
cc411d0b
BH		 1779 if (dad_failed)
1780 ifp->flags |= IFA_F_DADFAILED;
1da177e4 1781 spin_unlock_bh(&ifp->lock);
e2577a06
HX		 1782 if (dad_failed)
1783 ipv6_ifa_notify(0, ifp);
1da177e4 1784 in6_ifa_put(ifp);
1da177e4
LT		 1785 } else if (ifp->flags&IFA_F_TEMPORARY) {
1786 struct inet6_ifaddr *ifpub;
1787 spin_lock_bh(&ifp->lock);
1788 ifpub = ifp->ifpub;
1789 if (ifpub) {
1790 in6_ifa_hold(ifpub);
1791 spin_unlock_bh(&ifp->lock);
1792 ipv6_create_tempaddr(ifpub, ifp);
1793 in6_ifa_put(ifpub);
1794 } else {
1795 spin_unlock_bh(&ifp->lock);
1796 }
1797 ipv6_del_addr(ifp);
c15b1cca 1798 } else {
1da177e4 1799 ipv6_del_addr(ifp);
c15b1cca 1800 }
1da177e4
LT		 1801}
1802
f2344a13
HX		 1803static int addrconf_dad_end(struct inet6_ifaddr *ifp)
1804{
1805 int err = -ENOENT;
1806
8e8e676d 1807 spin_lock_bh(&ifp->lock);
f2344a13
HX		 1808 if (ifp->state == INET6_IFADDR_STATE_DAD) {
1809 ifp->state = INET6_IFADDR_STATE_POSTDAD;
1810 err = 0;
1811 }
8e8e676d 1812 spin_unlock_bh(&ifp->lock);
f2344a13
HX		 1813
1814 return err;
1815}
1816
3c21edbd
YH		 1817void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1818{
5f40ef77 1819 struct in6_addr addr;
1b34be74 1820 struct inet6_dev *idev = ifp->idev;
1855b7c3 1821 struct net *net = dev_net(ifp->idev->dev);
9bdd8d40 1822
853dc2e0
UB		 1823 if (addrconf_dad_end(ifp)) {
1824 in6_ifa_put(ifp);
f2344a13 1825 return;
853dc2e0 1826 }
f2344a13 1827
e87cc472
JP		 1828 net_info_ratelimited("%s: IPv6 duplicate address %pI6c detected!\n",
1829 ifp->idev->dev->name, &ifp->addr);
9bdd8d40 1830
5f40ef77
HFS		 1831 spin_lock_bh(&ifp->lock);
1832
1833 if (ifp->flags & IFA_F_STABLE_PRIVACY) {
1834 int scope = ifp->scope;
1835 u32 flags = ifp->flags;
1836 struct in6_addr new_addr;
1837 struct inet6_ifaddr *ifp2;
1838 u32 valid_lft, preferred_lft;
1839 int pfxlen = ifp->prefix_len;
5f40ef77
HFS		 1840 int retries = ifp->stable_privacy_retry + 1;
1841
1855b7c3 1842 if (retries > net->ipv6.sysctl.idgen_retries) {
5f40ef77
HFS		 1843 net_info_ratelimited("%s: privacy stable address generation failed because of DAD conflicts!\n",
1844 ifp->idev->dev->name);
1845 goto errdad;
1846 }
1847
1848 new_addr = ifp->addr;
1849 if (ipv6_generate_stable_address(&new_addr, retries,
1850 idev))
1851 goto errdad;
1852
1853 valid_lft = ifp->valid_lft;
1854 preferred_lft = ifp->prefered_lft;
1855
1856 spin_unlock_bh(&ifp->lock);
1b34be74 1857
5f40ef77
HFS		 1858 if (idev->cnf.max_addresses &&
1859 ipv6_count_addresses(idev) >=
1860 idev->cnf.max_addresses)
1861 goto lock_errdad;
1862
1863 net_info_ratelimited("%s: generating new stable privacy address because of DAD conflict\n",
1864 ifp->idev->dev->name);
1865
1866 ifp2 = ipv6_add_addr(idev, &new_addr, NULL, pfxlen,
1867 scope, flags, valid_lft,
1868 preferred_lft);
1869 if (IS_ERR(ifp2))
1870 goto lock_errdad;
1871
1872 spin_lock_bh(&ifp2->lock);
1873 ifp2->stable_privacy_retry = retries;
1874 ifp2->state = INET6_IFADDR_STATE_PREDAD;
1875 spin_unlock_bh(&ifp2->lock);
1876
1855b7c3 1877 addrconf_mod_dad_work(ifp2, net->ipv6.sysctl.idgen_delay);
5f40ef77
HFS		 1878 in6_ifa_put(ifp2);
1879lock_errdad:
1880 spin_lock_bh(&ifp->lock);
1881 } else if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6) {
1b34be74
YH		 1882 addr.s6_addr32[0] = htonl(0xfe800000);
1883 addr.s6_addr32[1] = 0;
1884
1885 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
1886 ipv6_addr_equal(&ifp->addr, &addr)) {
1887 /* DAD failed for link-local based on MAC address */
1888 idev->cnf.disable_ipv6 = 1;
9bdd8d40 1889
f3213831 1890 pr_info("%s: IPv6 being disabled!\n",
9bdd8d40 1891 ifp->idev->dev->name);
1b34be74
YH		 1892 }
1893 }
1894
5f40ef77 1895errdad:
c15b1cca
HFS		 1896 /* transition from _POSTDAD to _ERRDAD */
1897 ifp->state = INET6_IFADDR_STATE_ERRDAD;
8e8e676d 1898 spin_unlock_bh(&ifp->lock);
c15b1cca
HFS		 1899
1900 addrconf_mod_dad_work(ifp, 0);
3c21edbd 1901}
1da177e4 1902
a9ed4a29
SD		 1903/* Join to solicited addr multicast group.
1904 * caller must hold RTNL */
b71d1d42 1905void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr)
1da177e4
LT		 1906{
1907 struct in6_addr maddr;
1908
1909 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1910 return;
1911
1912 addrconf_addr_solict_mult(addr, &maddr);
1913 ipv6_dev_mc_inc(dev, &maddr);
1914}
1915
a9ed4a29 1916/* caller must hold RTNL */
b71d1d42 1917void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr)
1da177e4
LT		 1918{
1919 struct in6_addr maddr;
1920
1921 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1922 return;
1923
1924 addrconf_addr_solict_mult(addr, &maddr);
1925 __ipv6_dev_mc_dec(idev, &maddr);
1926}
1927
a9ed4a29 1928/* caller must hold RTNL */
20380731 1929static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1da177e4
LT		 1930{
1931 struct in6_addr addr;
c15b1cca 1932
88ad3149 1933 if (ifp->prefix_len >= 127) /* RFC 6164 */
2bda8a0c 1934 return;
1da177e4
LT		 1935 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1936 if (ipv6_addr_any(&addr))
1937 return;
013b4d90 1938 __ipv6_dev_ac_inc(ifp->idev, &addr);
1da177e4
LT		 1939}
1940
a9ed4a29 1941/* caller must hold RTNL */
20380731 1942static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1da177e4
LT		 1943{
1944 struct in6_addr addr;
c15b1cca 1945
88ad3149 1946 if (ifp->prefix_len >= 127) /* RFC 6164 */
32019e65 1947 return;
1da177e4
LT		 1948 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1949 if (ipv6_addr_any(&addr))
1950 return;
1951 __ipv6_dev_ac_dec(ifp->idev, &addr);
1952}
1953
06a4c1c5 1954static int addrconf_ifid_eui64(u8 *eui, struct net_device *dev)
1955{
5241c2d7 1956 if (dev->addr_len != EUI64_ADDR_LEN)
06a4c1c5 1957 return -1;
5241c2d7 1958 memcpy(eui, dev->dev_addr, EUI64_ADDR_LEN);
5e98a36e 1959 eui[0] ^= 2;
06a4c1c5 1960 return 0;
1961}
1962
cb6bf355
YH		 1963static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev)
1964{
1965 union fwnet_hwaddr *ha;
1966
1967 if (dev->addr_len != FWNET_ALEN)
1968 return -1;
1969
1970 ha = (union fwnet_hwaddr *)dev->dev_addr;
1971
1972 memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id));
1973 eui[0] ^= 2;
1974 return 0;
1975}
1976
073a8e0e
YH		 1977static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1978{
1979 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1980 if (dev->addr_len != ARCNET_ALEN)
1981 return -1;
1982 memset(eui, 0, 7);
8e5e8f30 1983 eui[7] = *(u8 *)dev->dev_addr;
073a8e0e
YH		 1984 return 0;
1985}
1986
1987static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1988{
1989 if (dev->addr_len != INFINIBAND_ALEN)
1990 return -1;
1991 memcpy(eui, dev->dev_addr + 12, 8);
1992 eui[0] |= 2;
1993 return 0;
1994}
1995
c61393ea 1996static int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
dfd982ba 1997{
9af28511
SH		 1998 if (addr == 0)
1999 return -1;
dfd982ba
YH		 2000 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
2001 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
2002 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
2003 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
2004 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
2005 ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
2006 eui[1] = 0;
2007 eui[2] = 0x5E;
2008 eui[3] = 0xFE;
2009 memcpy(eui + 4, &addr, 4);
2010 return 0;
2011}
dfd982ba
YH		 2012
2013static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
2014{
2015 if (dev->priv_flags & IFF_ISATAP)
2016 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
2017 return -1;
2018}
2019
aee80b54 2020static int addrconf_ifid_gre(u8 *eui, struct net_device *dev)
2021{
2022 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
2023}
2024
e837735e
ND		 2025static int addrconf_ifid_ip6tnl(u8 *eui, struct net_device *dev)
2026{
2027 memcpy(eui, dev->perm_addr, 3);
2028 memcpy(eui + 5, dev->perm_addr + 3, 3);
2029 eui[3] = 0xFF;
2030 eui[4] = 0xFE;
2031 eui[0] ^= 2;
2032 return 0;
2033}
2034
1da177e4
LT		 2035static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
2036{
2037 switch (dev->type) {
2038 case ARPHRD_ETHER:
2039 case ARPHRD_FDDI:
073a8e0e 2040 return addrconf_ifid_eui48(eui, dev);
1da177e4 2041 case ARPHRD_ARCNET:
073a8e0e 2042 return addrconf_ifid_arcnet(eui, dev);
1da177e4 2043 case ARPHRD_INFINIBAND:
073a8e0e 2044 return addrconf_ifid_infiniband(eui, dev);
c7dc89c0 2045 case ARPHRD_SIT:
dfd982ba 2046 return addrconf_ifid_sit(eui, dev);
aee80b54 2047 case ARPHRD_IPGRE:
2048 return addrconf_ifid_gre(eui, dev);
e74bccb8 2049 case ARPHRD_6LOWPAN:
06a4c1c5 2050 return addrconf_ifid_eui64(eui, dev);
cb6bf355
YH		 2051 case ARPHRD_IEEE1394:
2052 return addrconf_ifid_ieee1394(eui, dev);
e837735e
ND		 2053 case ARPHRD_TUNNEL6:
2054 return addrconf_ifid_ip6tnl(eui, dev);
1da177e4
LT		 2055 }
2056 return -1;
2057}
2058
2059static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
2060{
2061 int err = -1;
2062 struct inet6_ifaddr *ifp;
2063
2064 read_lock_bh(&idev->lock);
602582ca
HFS		 2065 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
2066 if (ifp->scope > IFA_LINK)
2067 break;
1da177e4
LT		 2068 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
2069 memcpy(eui, ifp->addr.s6_addr+8, 8);
2070 err = 0;
2071 break;
2072 }
2073 }
2074 read_unlock_bh(&idev->lock);
2075 return err;
2076}
2077
1da177e4 2078/* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
eb7e0575 2079static void __ipv6_regen_rndid(struct inet6_dev *idev)
1da177e4 2080{
1da177e4 2081regen:
955189ef 2082 get_random_bytes(idev->rndid, sizeof(idev->rndid));
1da177e4 2083 idev->rndid[0] &= ~0x02;
1da177e4
LT		 2084
2085 /*
2086 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
2087 * check if generated address is not inappropriate
2088 *
2089 * - Reserved subnet anycast (RFC 2526)
2090 * 11111101 11....11 1xxxxxxx
c7dc89c0 2091 * - ISATAP (RFC4214) 6.1
1da177e4
LT		 2092 * 00-00-5E-FE-xx-xx-xx-xx
2093 * - value 0
2094 * - XXX: already assigned to an address on the device
2095 */
1ab1457c 2096 if (idev->rndid[0] == 0xfd &&
1da177e4
LT		 2097 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
2098 (idev->rndid[7]&0x80))
2099 goto regen;
2100 if ((idev->rndid[0]|idev->rndid[1]) == 0) {
2101 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
2102 goto regen;
2103 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
2104 goto regen;
2105 }
1da177e4
LT		 2106}
2107
2108static void ipv6_regen_rndid(unsigned long data)
2109{
2110 struct inet6_dev *idev = (struct inet6_dev *) data;
2111 unsigned long expires;
2112
8814c4b5 2113 rcu_read_lock_bh();
1da177e4
LT		 2114 write_lock_bh(&idev->lock);
2115
2116 if (idev->dead)
2117 goto out;
2118
eb7e0575 2119 __ipv6_regen_rndid(idev);
1ab1457c 2120
1da177e4 2121 expires = jiffies +
1ab1457c 2122 idev->cnf.temp_prefered_lft * HZ -
1f9248e5
JP		 2123 idev->cnf.regen_max_retry * idev->cnf.dad_transmits *
2124 NEIGH_VAR(idev->nd_parms, RETRANS_TIME) -
784e2710 2125 idev->cnf.max_desync_factor * HZ;
1da177e4 2126 if (time_before(expires, jiffies)) {
f3213831
JP		 2127 pr_warn("%s: too short regeneration interval; timer disabled for %s\n",
2128 __func__, idev->dev->name);
1da177e4
LT		 2129 goto out;
2130 }
2131
2132 if (!mod_timer(&idev->regen_timer, expires))
2133 in6_dev_hold(idev);
2134
2135out:
2136 write_unlock_bh(&idev->lock);
8814c4b5 2137 rcu_read_unlock_bh();
1da177e4
LT		 2138 in6_dev_put(idev);
2139}
2140
eb7e0575 2141static void __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr)
8e5e8f30 2142{
1da177e4 2143 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
eb7e0575 2144 __ipv6_regen_rndid(idev);
1da177e4 2145}
1da177e4
LT		 2146
2147/*
2148 * Add prefix route.
2149 */
2150
2151static void
2152addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
e431b8c0 2153 unsigned long expires, u32 flags)
1da177e4 2154{
86872cb5 2155 struct fib6_config cfg = {
ca254490 2156 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX,
86872cb5
TG		 2157 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2158 .fc_ifindex = dev->ifindex,
2159 .fc_expires = expires,
2160 .fc_dst_len = plen,
2161 .fc_flags = RTF_UP | flags,
c346dca1 2162 .fc_nlinfo.nl_net = dev_net(dev),
f410a1fb 2163 .fc_protocol = RTPROT_KERNEL,
86872cb5 2164 };
1da177e4 2165
4e3fd7a0 2166 cfg.fc_dst = *pfx;
1da177e4
LT		 2167
2168 /* Prevent useless cloning on PtP SIT.
2169 This thing is done here expecting that the whole
2170 class of non-broadcast devices need not cloning.
2171 */
07a93626 2172#if IS_ENABLED(CONFIG_IPV6_SIT)
86872cb5
TG		 2173 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
2174 cfg.fc_flags |= RTF_NONEXTHOP;
0be669bb 2175#endif
1da177e4 2176
86872cb5 2177 ip6_route_add(&cfg);
1da177e4
LT		 2178}
2179
14ef37b6
AH		 2180
2181static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
2182 int plen,
2183 const struct net_device *dev,
2184 u32 flags, u32 noflags)
2185{
2186 struct fib6_node *fn;
2187 struct rt6_info *rt = NULL;
2188 struct fib6_table *table;
ca254490 2189 u32 tb_id = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX;
14ef37b6 2190
ca254490 2191 table = fib6_get_table(dev_net(dev), tb_id);
63159f29 2192 if (!table)
14ef37b6
AH		 2193 return NULL;
2194
5744dd9b 2195 read_lock_bh(&table->tb6_lock);
14ef37b6
AH		 2196 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0);
2197 if (!fn)
2198 goto out;
1f56a01f
MKL		 2199
2200 noflags |= RTF_CACHE;
14ef37b6 2201 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
d1918542 2202 if (rt->dst.dev->ifindex != dev->ifindex)
14ef37b6
AH		 2203 continue;
2204 if ((rt->rt6i_flags & flags) != flags)
2205 continue;
85da53bf 2206 if ((rt->rt6i_flags & noflags) != 0)
14ef37b6
AH		 2207 continue;
2208 dst_hold(&rt->dst);
2209 break;
2210 }
2211out:
5744dd9b 2212 read_unlock_bh(&table->tb6_lock);
14ef37b6
AH		 2213 return rt;
2214}
2215
2216
1da177e4
LT		 2217/* Create "default" multicast route to the interface */
2218
2219static void addrconf_add_mroute(struct net_device *dev)
2220{
86872cb5 2221 struct fib6_config cfg = {
ca254490 2222 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_LOCAL,
86872cb5
TG		 2223 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2224 .fc_ifindex = dev->ifindex,
2225 .fc_dst_len = 8,
2226 .fc_flags = RTF_UP,
c346dca1 2227 .fc_nlinfo.nl_net = dev_net(dev),
86872cb5
TG		 2228 };
2229
2230 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
2231
2232 ip6_route_add(&cfg);
1da177e4
LT		 2233}
2234
1da177e4
LT		 2235static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
2236{
2237 struct inet6_dev *idev;
2238
2239 ASSERT_RTNL();
2240
e21e8467
SH		 2241 idev = ipv6_find_idev(dev);
2242 if (!idev)
64e724f6
BH		 2243 return ERR_PTR(-ENOBUFS);
2244
2245 if (idev->cnf.disable_ipv6)
2246 return ERR_PTR(-EACCES);
1da177e4
LT		 2247
2248 /* Add default multicast route */
4af04aba
LW		 2249 if (!(dev->flags & IFF_LOOPBACK))
2250 addrconf_add_mroute(dev);
1da177e4 2251
1da177e4
LT		 2252 return idev;
2253}
2254
53bd6749
JP		 2255static void manage_tempaddrs(struct inet6_dev *idev,
2256 struct inet6_ifaddr *ifp,
2257 __u32 valid_lft, __u32 prefered_lft,
2258 bool create, unsigned long now)
2259{
2260 u32 flags;
2261 struct inet6_ifaddr *ift;
2262
2263 read_lock_bh(&idev->lock);
2264 /* update all temporary addresses in the list */
2265 list_for_each_entry(ift, &idev->tempaddr_list, tmp_list) {
2266 int age, max_valid, max_prefered;
2267
2268 if (ifp != ift->ifpub)
2269 continue;
2270
2271 /* RFC 4941 section 3.3:
2272 * If a received option will extend the lifetime of a public
2273 * address, the lifetimes of temporary addresses should
2274 * be extended, subject to the overall constraint that no
2275 * temporary addresses should ever remain "valid" or "preferred"
2276 * for a time longer than (TEMP_VALID_LIFETIME) or
2277 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), respectively.
2278 */
2279 age = (now - ift->cstamp) / HZ;
2280 max_valid = idev->cnf.temp_valid_lft - age;
2281 if (max_valid < 0)
2282 max_valid = 0;
2283
2284 max_prefered = idev->cnf.temp_prefered_lft -
2285 idev->cnf.max_desync_factor - age;
2286 if (max_prefered < 0)
2287 max_prefered = 0;
2288
2289 if (valid_lft > max_valid)
2290 valid_lft = max_valid;
2291
2292 if (prefered_lft > max_prefered)
2293 prefered_lft = max_prefered;
2294
2295 spin_lock(&ift->lock);
2296 flags = ift->flags;
2297 ift->valid_lft = valid_lft;
2298 ift->prefered_lft = prefered_lft;
2299 ift->tstamp = now;
2300 if (prefered_lft > 0)
2301 ift->flags &= ~IFA_F_DEPRECATED;
2302
2303 spin_unlock(&ift->lock);
2304 if (!(flags&IFA_F_TENTATIVE))
2305 ipv6_ifa_notify(0, ift);
2306 }
2307
2308 if ((create || list_empty(&idev->tempaddr_list)) &&
2309 idev->cnf.use_tempaddr > 0) {
2310 /* When a new public address is created as described
2311 * in [ADDRCONF], also create a new temporary address.
2312 * Also create a temporary address if it's enabled but
2313 * no temporary address currently exists.
2314 */
2315 read_unlock_bh(&idev->lock);
2316 ipv6_create_tempaddr(ifp, NULL);
2317 } else {
2318 read_unlock_bh(&idev->lock);
2319 }
2320}
2321
cc9da6cc
BM		 2322static bool is_addr_mode_generate_stable(struct inet6_dev *idev)
2323{
2324 return idev->addr_gen_mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY ||
2325 idev->addr_gen_mode == IN6_ADDR_GEN_MODE_RANDOM;
2326}
2327
e6bff995 2328void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao)
1da177e4
LT		 2329{
2330 struct prefix_info *pinfo;
2331 __u32 valid_lft;
2332 __u32 prefered_lft;
2333 int addr_type;
64236f3f 2334 u32 addr_flags = 0;
1da177e4 2335 struct inet6_dev *in6_dev;
56d417b1 2336 struct net *net = dev_net(dev);
1da177e4
LT		 2337
2338 pinfo = (struct prefix_info *) opt;
1ab1457c 2339
1da177e4 2340 if (len < sizeof(struct prefix_info)) {
ba3542e1 2341 ADBG("addrconf: prefix option too short\n");
1da177e4
LT		 2342 return;
2343 }
1ab1457c 2344
1da177e4
LT		 2345 /*
2346 * Validation checks ([ADDRCONF], page 19)
2347 */
2348
2349 addr_type = ipv6_addr_type(&pinfo->prefix);
2350
2351 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
2352 return;
2353
2354 valid_lft = ntohl(pinfo->valid);
2355 prefered_lft = ntohl(pinfo->prefered);
2356
2357 if (prefered_lft > valid_lft) {
e87cc472 2358 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n");
1da177e4
LT		 2359 return;
2360 }
2361
2362 in6_dev = in6_dev_get(dev);
2363
63159f29 2364 if (!in6_dev) {
e87cc472
JP		 2365 net_dbg_ratelimited("addrconf: device %s not configured\n",
2366 dev->name);
1da177e4
LT		 2367 return;
2368 }
2369
2370 /*
2371 * Two things going on here:
2372 * 1) Add routes for on-link prefixes
2373 * 2) Configure prefixes with the auto flag set
2374 */
2375
4bed72e4
YH		 2376 if (pinfo->onlink) {
2377 struct rt6_info *rt;
2378 unsigned long rt_expires;
2379
6f704992
YH		 2380 /* Avoid arithmetic overflow. Really, we could
2381 * save rt_expires in seconds, likely valid_lft,
2382 * but it would require division in fib gc, that it
2383 * not good.
2384 */
4bed72e4
YH		 2385 if (HZ > USER_HZ)
2386 rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
2387 else
2388 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
3dd4bc68 2389
4bed72e4
YH		 2390 if (addrconf_finite_timeout(rt_expires))
2391 rt_expires *= HZ;
1da177e4 2392
14ef37b6
AH		 2393 rt = addrconf_get_prefix_route(&pinfo->prefix,
2394 pinfo->prefix_len,
2395 dev,
2396 RTF_ADDRCONF | RTF_PREFIX_RT,
2397 RTF_GATEWAY | RTF_DEFAULT);
1da177e4 2398
14ef37b6 2399 if (rt) {
6f704992
YH		 2400 /* Autoconf prefix route */
2401 if (valid_lft == 0) {
2402 ip6_del_rt(rt);
2403 rt = NULL;
4bed72e4 2404 } else if (addrconf_finite_timeout(rt_expires)) {
6f704992 2405 /* not infinity */
1716a961 2406 rt6_set_expires(rt, jiffies + rt_expires);
6f704992 2407 } else {
1716a961 2408 rt6_clean_expires(rt);
1da177e4
LT		 2409 }
2410 } else if (valid_lft) {
6f704992 2411 clock_t expires = 0;
4bed72e4
YH		 2412 int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
2413 if (addrconf_finite_timeout(rt_expires)) {
6f704992
YH		 2414 /* not infinity */
2415 flags |= RTF_EXPIRES;
2416 expires = jiffies_to_clock_t(rt_expires);
2417 }
1da177e4 2418 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
6f704992 2419 dev, expires, flags);
1da177e4 2420 }
94e187c0 2421 ip6_rt_put(rt);
1da177e4
LT		 2422 }
2423
2424 /* Try to figure out our local address for this prefix */
2425
2426 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
8e5e8f30 2427 struct inet6_ifaddr *ifp;
1da177e4
LT		 2428 struct in6_addr addr;
2429 int create = 0, update_lft = 0;
617fe29d 2430 bool tokenized = false;
1da177e4
LT		 2431
2432 if (pinfo->prefix_len == 64) {
2433 memcpy(&addr, &pinfo->prefix, 8);
f53adae4
DB		 2434
2435 if (!ipv6_addr_any(&in6_dev->token)) {
2436 read_lock_bh(&in6_dev->lock);
2437 memcpy(addr.s6_addr + 8,
2438 in6_dev->token.s6_addr + 8, 8);
2439 read_unlock_bh(&in6_dev->lock);
617fe29d 2440 tokenized = true;
cc9da6cc 2441 } else if (is_addr_mode_generate_stable(in6_dev) &&
622c81d5
HFS		 2442 !ipv6_generate_stable_address(&addr, 0,
2443 in6_dev)) {
64236f3f 2444 addr_flags |= IFA_F_STABLE_PRIVACY;
622c81d5 2445 goto ok;
f53adae4
DB		 2446 } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
2447 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
1da177e4
LT		 2448 in6_dev_put(in6_dev);
2449 return;
2450 }
2451 goto ok;
2452 }
e87cc472
JP		 2453 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n",
2454 pinfo->prefix_len);
1da177e4
LT		 2455 in6_dev_put(in6_dev);
2456 return;
2457
2458ok:
2459
53b7997f 2460 ifp = ipv6_get_ifaddr(net, &addr, dev, 1);
1da177e4 2461
63159f29 2462 if (!ifp && valid_lft) {
1da177e4 2463 int max_addresses = in6_dev->cnf.max_addresses;
95c385b4
NH		 2464
2465#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2466 if (in6_dev->cnf.optimistic_dad &&
e6bff995 2467 !net->ipv6.devconf_all->forwarding && sllao)
9a1ec461 2468 addr_flags |= IFA_F_OPTIMISTIC;
95c385b4 2469#endif
1da177e4
LT		 2470
2471 /* Do not allow to create too much of autoconfigured
2472 * addresses; this would be too easy way to crash kernel.
2473 */
2474 if (!max_addresses ||
2475 ipv6_count_addresses(in6_dev) < max_addresses)
3f8f5298
JP		 2476 ifp = ipv6_add_addr(in6_dev, &addr, NULL,
2477 pinfo->prefix_len,
95c385b4 2478 addr_type&IPV6_ADDR_SCOPE_MASK,
8a226b2c
JB		 2479 addr_flags, valid_lft,
2480 prefered_lft);
1da177e4 2481
3f0d2ba0 2482 if (IS_ERR_OR_NULL(ifp)) {
1da177e4
LT		 2483 in6_dev_put(in6_dev);
2484 return;
2485 }
2486
8a226b2c
JB		 2487 update_lft = 0;
2488 create = 1;
c15b1cca
HFS		 2489 spin_lock_bh(&ifp->lock);
2490 ifp->flags |= IFA_F_MANAGETEMPADDR;
1da177e4 2491 ifp->cstamp = jiffies;
617fe29d 2492 ifp->tokenized = tokenized;
c15b1cca 2493 spin_unlock_bh(&ifp->lock);
cf22f9a2 2494 addrconf_dad_start(ifp);
1da177e4
LT		 2495 }
2496
2497 if (ifp) {
479840ff 2498 u32 flags;
1da177e4 2499 unsigned long now;
1da177e4
LT		 2500 u32 stored_lft;
2501
2502 /* update lifetime (RFC2462 5.5.3 e) */
8e8e676d 2503 spin_lock_bh(&ifp->lock);
1da177e4
LT		 2504 now = jiffies;
2505 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
2506 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
2507 else
2508 stored_lft = 0;
8a226b2c 2509 if (!update_lft && !create && stored_lft) {
9451a304
FF		 2510 const u32 minimum_lft = min_t(u32,
2511 stored_lft, MIN_VALID_LIFETIME);
c9d55d5b
PM		 2512 valid_lft = max(valid_lft, minimum_lft);
2513
2514 /* RFC4862 Section 5.5.3e:
2515 * "Note that the preferred lifetime of the
2516 * corresponding address is always reset to
2517 * the Preferred Lifetime in the received
2518 * Prefix Information option, regardless of
2519 * whether the valid lifetime is also reset or
2520 * ignored."
2521 *
2522 * So we should always update prefered_lft here.
2523 */
2524 update_lft = 1;
1da177e4
LT		 2525 }
2526
2527 if (update_lft) {
2528 ifp->valid_lft = valid_lft;
2529 ifp->prefered_lft = prefered_lft;
2530 ifp->tstamp = now;
2531 flags = ifp->flags;
2532 ifp->flags &= ~IFA_F_DEPRECATED;
8e8e676d 2533 spin_unlock_bh(&ifp->lock);
1da177e4
LT		 2534
2535 if (!(flags&IFA_F_TENTATIVE))
2536 ipv6_ifa_notify(0, ifp);
2537 } else
8e8e676d 2538 spin_unlock_bh(&ifp->lock);
1da177e4 2539
53bd6749
JP		 2540 manage_tempaddrs(in6_dev, ifp, valid_lft, prefered_lft,
2541 create, now);
5d9efa7e 2542
1da177e4 2543 in6_ifa_put(ifp);
c15b1cca 2544 addrconf_verify();
1da177e4
LT		 2545 }
2546 }
2547 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
2548 in6_dev_put(in6_dev);
2549}
2550
2551/*
2552 * Set destination address.
2553 * Special case for SIT interfaces where we create a new "virtual"
2554 * device.
2555 */
af284937 2556int addrconf_set_dstaddr(struct net *net, void __user *arg)
1da177e4
LT		 2557{
2558 struct in6_ifreq ireq;
2559 struct net_device *dev;
2560 int err = -EINVAL;
2561
2562 rtnl_lock();
2563
2564 err = -EFAULT;
2565 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2566 goto err_exit;
2567
af284937 2568 dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
1da177e4
LT		 2569
2570 err = -ENODEV;
63159f29 2571 if (!dev)
1da177e4
LT		 2572 goto err_exit;
2573
07a93626 2574#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4 2575 if (dev->type == ARPHRD_SIT) {
5bc3eb7e 2576 const struct net_device_ops *ops = dev->netdev_ops;
1da177e4 2577 struct ifreq ifr;
1da177e4
LT		 2578 struct ip_tunnel_parm p;
2579
2580 err = -EADDRNOTAVAIL;
2581 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2582 goto err_exit;
2583
2584 memset(&p, 0, sizeof(p));
2585 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2586 p.iph.saddr = 0;
2587 p.iph.version = 4;
2588 p.iph.ihl = 5;
2589 p.iph.protocol = IPPROTO_IPV6;
2590 p.iph.ttl = 64;
d20b3109 2591 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
1da177e4 2592
5bc3eb7e
SH		 2593 if (ops->ndo_do_ioctl) {
2594 mm_segment_t oldfs = get_fs();
2595
2596 set_fs(KERNEL_DS);
2597 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2598 set_fs(oldfs);
2599 } else
2600 err = -EOPNOTSUPP;
1da177e4
LT		 2601
2602 if (err == 0) {
2603 err = -ENOBUFS;
af284937
DL		 2604 dev = __dev_get_by_name(net, p.name);
2605 if (!dev)
1da177e4
LT		 2606 goto err_exit;
2607 err = dev_open(dev);
2608 }
2609 }
0be669bb 2610#endif
1da177e4
LT		 2611
2612err_exit:
2613 rtnl_unlock();
2614 return err;
2615}
2616
93a714d6
MC		 2617static int ipv6_mc_config(struct sock *sk, bool join,
2618 const struct in6_addr *addr, int ifindex)
2619{
2620 int ret;
2621
2622 ASSERT_RTNL();
2623
2624 lock_sock(sk);
2625 if (join)
54ff9ef3 2626 ret = ipv6_sock_mc_join(sk, ifindex, addr);
93a714d6 2627 else
54ff9ef3 2628 ret = ipv6_sock_mc_drop(sk, ifindex, addr);
93a714d6
MC		 2629 release_sock(sk);
2630
2631 return ret;
2632}
2633
1da177e4
LT		 2634/*
2635 * Manual configuration of address on an interface
2636 */
479840ff
JP		 2637static int inet6_addr_add(struct net *net, int ifindex,
2638 const struct in6_addr *pfx,
caeaba79 2639 const struct in6_addr *peer_pfx,
479840ff
JP		 2640 unsigned int plen, __u32 ifa_flags,
2641 __u32 prefered_lft, __u32 valid_lft)
1da177e4
LT		 2642{
2643 struct inet6_ifaddr *ifp;
2644 struct inet6_dev *idev;
2645 struct net_device *dev;
93a714d6
MC		 2646 unsigned long timeout;
2647 clock_t expires;
1da177e4 2648 int scope;
6f704992 2649 u32 flags;
1da177e4
LT		 2650
2651 ASSERT_RTNL();
1ab1457c 2652
24ef0da7
TG		 2653 if (plen > 128)
2654 return -EINVAL;
2655
0778769d
NT		 2656 /* check the lifetime */
2657 if (!valid_lft || prefered_lft > valid_lft)
2658 return -EINVAL;
2659
53bd6749
JP		 2660 if (ifa_flags & IFA_F_MANAGETEMPADDR && plen != 64)
2661 return -EINVAL;
2662
af284937
DL		 2663 dev = __dev_get_by_index(net, ifindex);
2664 if (!dev)
1da177e4 2665 return -ENODEV;
1ab1457c 2666
64e724f6
BH		 2667 idev = addrconf_add_dev(dev);
2668 if (IS_ERR(idev))
2669 return PTR_ERR(idev);
1da177e4 2670
93a714d6
MC		 2671 if (ifa_flags & IFA_F_MCAUTOJOIN) {
2672 int ret = ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2673 true, pfx, ifindex);
2674
2675 if (ret < 0)
2676 return ret;
2677 }
2678
1da177e4
LT		 2679 scope = ipv6_addr_scope(pfx);
2680
4bed72e4
YH		 2681 timeout = addrconf_timeout_fixup(valid_lft, HZ);
2682 if (addrconf_finite_timeout(timeout)) {
2683 expires = jiffies_to_clock_t(timeout * HZ);
2684 valid_lft = timeout;
6f704992 2685 flags = RTF_EXPIRES;
4bed72e4
YH		 2686 } else {
2687 expires = 0;
2688 flags = 0;
2689 ifa_flags |= IFA_F_PERMANENT;
6f704992 2690 }
0778769d 2691
4bed72e4
YH		 2692 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
2693 if (addrconf_finite_timeout(timeout)) {
2694 if (timeout == 0)
2695 ifa_flags |= IFA_F_DEPRECATED;
2696 prefered_lft = timeout;
2697 }
0778769d 2698
8a226b2c
JB		 2699 ifp = ipv6_add_addr(idev, pfx, peer_pfx, plen, scope, ifa_flags,
2700 valid_lft, prefered_lft);
0778769d 2701
1da177e4 2702 if (!IS_ERR(ifp)) {
761aac73
TH		 2703 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) {
2704 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
2705 expires, flags);
2706 }
2707
95c385b4
NH		 2708 /*
2709 * Note that section 3.1 of RFC 4429 indicates
2710 * that the Optimistic flag should not be set for
2711 * manually configured addresses
2712 */
cf22f9a2 2713 addrconf_dad_start(ifp);
53bd6749
JP		 2714 if (ifa_flags & IFA_F_MANAGETEMPADDR)
2715 manage_tempaddrs(idev, ifp, valid_lft, prefered_lft,
2716 true, jiffies);
1da177e4 2717 in6_ifa_put(ifp);
c15b1cca 2718 addrconf_verify_rtnl();
1da177e4 2719 return 0;
93a714d6
MC		 2720 } else if (ifa_flags & IFA_F_MCAUTOJOIN) {
2721 ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2722 false, pfx, ifindex);
1da177e4
LT		 2723 }
2724
2725 return PTR_ERR(ifp);
2726}
2727
6046d5b4
HK		 2728static int inet6_addr_del(struct net *net, int ifindex, u32 ifa_flags,
2729 const struct in6_addr *pfx, unsigned int plen)
1da177e4
LT		 2730{
2731 struct inet6_ifaddr *ifp;
2732 struct inet6_dev *idev;
2733 struct net_device *dev;
1ab1457c 2734
24ef0da7
TG		 2735 if (plen > 128)
2736 return -EINVAL;
2737
af284937
DL		 2738 dev = __dev_get_by_index(net, ifindex);
2739 if (!dev)
1da177e4
LT		 2740 return -ENODEV;
2741
e5d08d71 2742 idev = __in6_dev_get(dev);
63159f29 2743 if (!idev)
1da177e4
LT		 2744 return -ENXIO;
2745
2746 read_lock_bh(&idev->lock);
502a2ffd 2747 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1da177e4
LT		 2748 if (ifp->prefix_len == plen &&
2749 ipv6_addr_equal(pfx, &ifp->addr)) {
2750 in6_ifa_hold(ifp);
2751 read_unlock_bh(&idev->lock);
1ab1457c 2752
6046d5b4
HK		 2753 if (!(ifp->flags & IFA_F_TEMPORARY) &&
2754 (ifa_flags & IFA_F_MANAGETEMPADDR))
2755 manage_tempaddrs(idev, ifp, 0, 0, false,
2756 jiffies);
1da177e4 2757 ipv6_del_addr(ifp);
6046d5b4 2758 addrconf_verify_rtnl();
93a714d6
MC		 2759 if (ipv6_addr_is_multicast(pfx)) {
2760 ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2761 false, pfx, dev->ifindex);
2762 }
1da177e4
LT		 2763 return 0;
2764 }
2765 }
2766 read_unlock_bh(&idev->lock);
2767 return -EADDRNOTAVAIL;
2768}
2769
2770
af284937 2771int addrconf_add_ifaddr(struct net *net, void __user *arg)
1da177e4
LT		 2772{
2773 struct in6_ifreq ireq;
2774 int err;
1ab1457c 2775
af31f412 2776 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1da177e4 2777 return -EPERM;
1ab1457c 2778
1da177e4
LT		 2779 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2780 return -EFAULT;
2781
2782 rtnl_lock();
caeaba79 2783 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, NULL,
af284937
DL		 2784 ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2785 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
1da177e4
LT		 2786 rtnl_unlock();
2787 return err;
2788}
2789
af284937 2790int addrconf_del_ifaddr(struct net *net, void __user *arg)
1da177e4
LT		 2791{
2792 struct in6_ifreq ireq;
2793 int err;
1ab1457c 2794
af31f412 2795 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1da177e4
LT		 2796 return -EPERM;
2797
2798 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2799 return -EFAULT;
2800
2801 rtnl_lock();
6046d5b4 2802 err = inet6_addr_del(net, ireq.ifr6_ifindex, 0, &ireq.ifr6_addr,
af284937 2803 ireq.ifr6_prefixlen);
1da177e4
LT		 2804 rtnl_unlock();
2805 return err;
2806}
2807
b5f348e5
IJ		 2808static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
2809 int plen, int scope)
2810{
2811 struct inet6_ifaddr *ifp;
2812
8a226b2c 2813 ifp = ipv6_add_addr(idev, addr, NULL, plen,
07edd741
HFS		 2814 scope, IFA_F_PERMANENT,
2815 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
b5f348e5
IJ		 2816 if (!IS_ERR(ifp)) {
2817 spin_lock_bh(&ifp->lock);
2818 ifp->flags &= ~IFA_F_TENTATIVE;
2819 spin_unlock_bh(&ifp->lock);
2820 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2821 in6_ifa_put(ifp);
2822 }
2823}
2824
07a93626 2825#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4
LT		 2826static void sit_add_v4_addrs(struct inet6_dev *idev)
2827{
1da177e4
LT		 2828 struct in6_addr addr;
2829 struct net_device *dev;
c346dca1 2830 struct net *net = dev_net(idev->dev);
929c9cf3 2831 int scope, plen;
f0e2acfa 2832 u32 pflags = 0;
1da177e4
LT		 2833
2834 ASSERT_RTNL();
2835
2836 memset(&addr, 0, sizeof(struct in6_addr));
2837 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2838
2839 if (idev->dev->flags&IFF_POINTOPOINT) {
2840 addr.s6_addr32[0] = htonl(0xfe800000);
2841 scope = IFA_LINK;
929c9cf3 2842 plen = 64;
1da177e4
LT		 2843 } else {
2844 scope = IPV6_ADDR_COMPATv4;
929c9cf3 2845 plen = 96;
f0e2acfa 2846 pflags |= RTF_NONEXTHOP;
1da177e4
LT		 2847 }
2848
2849 if (addr.s6_addr32[3]) {
929c9cf3 2850 add_addr(idev, &addr, plen, scope);
f0e2acfa 2851 addrconf_prefix_route(&addr, plen, idev->dev, 0, pflags);
1da177e4
LT		 2852 return;
2853 }
2854
6fda7350 2855 for_each_netdev(net, dev) {
8e5e8f30 2856 struct in_device *in_dev = __in_dev_get_rtnl(dev);
1da177e4 2857 if (in_dev && (dev->flags & IFF_UP)) {
8e5e8f30 2858 struct in_ifaddr *ifa;
1da177e4
LT		 2859
2860 int flag = scope;
2861
2862 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
1da177e4
LT		 2863
2864 addr.s6_addr32[3] = ifa->ifa_local;
2865
2866 if (ifa->ifa_scope == RT_SCOPE_LINK)
2867 continue;
2868 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2869 if (idev->dev->flags&IFF_POINTOPOINT)
2870 continue;
2871 flag |= IFA_HOST;
2872 }
1da177e4 2873
b5f348e5 2874 add_addr(idev, &addr, plen, flag);
f0e2acfa
ND		 2875 addrconf_prefix_route(&addr, plen, idev->dev, 0,
2876 pflags);
1da177e4
LT		 2877 }
2878 }
1ab1457c 2879 }
1da177e4 2880}
0be669bb 2881#endif
1da177e4
LT		 2882
2883static void init_loopback(struct net_device *dev)
2884{
2885 struct inet6_dev *idev;
25fb6ca4
BK		 2886 struct net_device *sp_dev;
2887 struct inet6_ifaddr *sp_ifa;
2888 struct rt6_info *sp_rt;
1da177e4
LT		 2889
2890 /* ::1 */
2891
2892 ASSERT_RTNL();
2893
e5d08d71 2894 idev = ipv6_find_idev(dev);
63159f29 2895 if (!idev) {
91df42be 2896 pr_debug("%s: add_dev failed\n", __func__);
1da177e4
LT		 2897 return;
2898 }
2899
b5f348e5 2900 add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
25fb6ca4
BK		 2901
2902 /* Add routes to other interface's IPv6 addresses */
2903 for_each_netdev(dev_net(dev), sp_dev) {
2904 if (!strcmp(sp_dev->name, dev->name))
2905 continue;
2906
2907 idev = __in6_dev_get(sp_dev);
2908 if (!idev)
2909 continue;
2910
2911 read_lock_bh(&idev->lock);
2912 list_for_each_entry(sp_ifa, &idev->addr_list, if_list) {
2913
2914 if (sp_ifa->flags & (IFA_F_DADFAILED | IFA_F_TENTATIVE))
2915 continue;
2916
33d99113
G		 2917 if (sp_ifa->rt) {
2918 /* This dst has been added to garbage list when
2919 * lo device down, release this obsolete dst and
2920 * reallocate a new router for ifa.
2921 */
2922 if (sp_ifa->rt->dst.obsolete > 0) {
2923 ip6_rt_put(sp_ifa->rt);
2924 sp_ifa->rt = NULL;
2925 } else {
2926 continue;
2927 }
2928 }
a881ae1f 2929
57ec0afe 2930 sp_rt = addrconf_dst_alloc(idev, &sp_ifa->addr, false);
25fb6ca4
BK		 2931
2932 /* Failure cases are ignored */
534c8779
G		 2933 if (!IS_ERR(sp_rt)) {
2934 sp_ifa->rt = sp_rt;
25fb6ca4 2935 ip6_ins_rt(sp_rt);
534c8779 2936 }
25fb6ca4
BK		 2937 }
2938 read_unlock_bh(&idev->lock);
2939 }
1da177e4
LT		 2940}
2941
64236f3f
HFS		 2942static void addrconf_add_linklocal(struct inet6_dev *idev,
2943 const struct in6_addr *addr, u32 flags)
1da177e4 2944{
8e5e8f30 2945 struct inet6_ifaddr *ifp;
64236f3f 2946 u32 addr_flags = flags | IFA_F_PERMANENT;
95c385b4
NH		 2947
2948#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2949 if (idev->cnf.optimistic_dad &&
702beb87 2950 !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
95c385b4
NH		 2951 addr_flags |= IFA_F_OPTIMISTIC;
2952#endif
1da177e4 2953
07edd741
HFS		 2954 ifp = ipv6_add_addr(idev, addr, NULL, 64, IFA_LINK, addr_flags,
2955 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
1da177e4 2956 if (!IS_ERR(ifp)) {
46d48046 2957 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
cf22f9a2 2958 addrconf_dad_start(ifp);
1da177e4
LT		 2959 in6_ifa_put(ifp);
2960 }
2961}
2962
622c81d5
HFS		 2963static bool ipv6_reserved_interfaceid(struct in6_addr address)
2964{
2965 if ((address.s6_addr32[2] | address.s6_addr32[3]) == 0)
2966 return true;
2967
2968 if (address.s6_addr32[2] == htonl(0x02005eff) &&
2969 ((address.s6_addr32[3] & htonl(0xfe000000)) == htonl(0xfe000000)))
2970 return true;
2971
2972 if (address.s6_addr32[2] == htonl(0xfdffffff) &&
2973 ((address.s6_addr32[3] & htonl(0xffffff80)) == htonl(0xffffff80)))
2974 return true;
2975
2976 return false;
2977}
2978
2979static int ipv6_generate_stable_address(struct in6_addr *address,
2980 u8 dad_count,
2981 const struct inet6_dev *idev)
2982{
622c81d5
HFS		 2983 static DEFINE_SPINLOCK(lock);
2984 static __u32 digest[SHA_DIGEST_WORDS];
2985 static __u32 workspace[SHA_WORKSPACE_WORDS];
2986
2987 static union {
2988 char __data[SHA_MESSAGE_BYTES];
2989 struct {
2990 struct in6_addr secret;
ff40217e 2991 __be32 prefix[2];
622c81d5
HFS		 2992 unsigned char hwaddr[MAX_ADDR_LEN];
2993 u8 dad_count;
2994 } __packed;
2995 } data;
2996
2997 struct in6_addr secret;
2998 struct in6_addr temp;
2999 struct net *net = dev_net(idev->dev);
3000
3001 BUILD_BUG_ON(sizeof(data.__data) != sizeof(data));
3002
3003 if (idev->cnf.stable_secret.initialized)
3004 secret = idev->cnf.stable_secret.secret;
3005 else if (net->ipv6.devconf_dflt->stable_secret.initialized)
3006 secret = net->ipv6.devconf_dflt->stable_secret.secret;
3007 else
3008 return -1;
3009
3010retry:
3011 spin_lock_bh(&lock);
3012
3013 sha_init(digest);
3014 memset(&data, 0, sizeof(data));
3015 memset(workspace, 0, sizeof(workspace));
3016 memcpy(data.hwaddr, idev->dev->perm_addr, idev->dev->addr_len);
ff40217e
HFS		 3017 data.prefix[0] = address->s6_addr32[0];
3018 data.prefix[1] = address->s6_addr32[1];
622c81d5
HFS		 3019 data.secret = secret;
3020 data.dad_count = dad_count;
3021
3022 sha_transform(digest, data.__data, workspace);
3023
3024 temp = *address;
ff40217e
HFS		 3025 temp.s6_addr32[2] = (__force __be32)digest[0];
3026 temp.s6_addr32[3] = (__force __be32)digest[1];
622c81d5
HFS		 3027
3028 spin_unlock_bh(&lock);
3029
3030 if (ipv6_reserved_interfaceid(temp)) {
3031 dad_count++;
1855b7c3 3032 if (dad_count > dev_net(idev->dev)->ipv6.sysctl.idgen_retries)
622c81d5
HFS		 3033 return -1;
3034 goto retry;
3035 }
3036
3037 *address = temp;
3038 return 0;
3039}
3040
cc9da6cc
BM		 3041static void ipv6_gen_mode_random_init(struct inet6_dev *idev)
3042{
3043 struct ipv6_stable_secret *s = &idev->cnf.stable_secret;
3044
3045 if (s->initialized)
3046 return;
3047 s = &idev->cnf.stable_secret;
3048 get_random_bytes(&s->secret, sizeof(s->secret));
3049 s->initialized = true;
3050}
3051
bc91b0f0
JP		 3052static void addrconf_addr_gen(struct inet6_dev *idev, bool prefix_route)
3053{
622c81d5
HFS		 3054 struct in6_addr addr;
3055
ca254490
DA		 3056 /* no link local addresses on L3 master devices */
3057 if (netif_is_l3_master(idev->dev))
3058 return;
3059
622c81d5 3060 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
bc91b0f0 3061
cc9da6cc
BM		 3062 switch (idev->addr_gen_mode) {
3063 case IN6_ADDR_GEN_MODE_RANDOM:
3064 ipv6_gen_mode_random_init(idev);
3065 /* fallthrough */
3066 case IN6_ADDR_GEN_MODE_STABLE_PRIVACY:
622c81d5 3067 if (!ipv6_generate_stable_address(&addr, 0, idev))
64236f3f
HFS		 3068 addrconf_add_linklocal(idev, &addr,
3069 IFA_F_STABLE_PRIVACY);
622c81d5
HFS		 3070 else if (prefix_route)
3071 addrconf_prefix_route(&addr, 64, idev->dev, 0, 0);
cc9da6cc
BM		 3072 break;
3073 case IN6_ADDR_GEN_MODE_EUI64:
bc91b0f0
JP		 3074 /* addrconf_add_linklocal also adds a prefix_route and we
3075 * only need to care about prefix routes if ipv6_generate_eui64
3076 * couldn't generate one.
3077 */
3078 if (ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) == 0)
64236f3f 3079 addrconf_add_linklocal(idev, &addr, 0);
bc91b0f0
JP		 3080 else if (prefix_route)
3081 addrconf_prefix_route(&addr, 64, idev->dev, 0, 0);
cc9da6cc
BM		 3082 break;
3083 case IN6_ADDR_GEN_MODE_NONE:
3084 default:
3085 /* will not add any link local address */
3086 break;
bc91b0f0
JP		 3087 }
3088}
3089
1da177e4
LT		 3090static void addrconf_dev_config(struct net_device *dev)
3091{
8e5e8f30 3092 struct inet6_dev *idev;
1da177e4
LT		 3093
3094 ASSERT_RTNL();
3095
74235a25
HX		 3096 if ((dev->type != ARPHRD_ETHER) &&
3097 (dev->type != ARPHRD_FDDI) &&
74235a25 3098 (dev->type != ARPHRD_ARCNET) &&
06a4c1c5 3099 (dev->type != ARPHRD_INFINIBAND) &&
e837735e 3100 (dev->type != ARPHRD_IEEE1394) &&
e74bccb8 3101 (dev->type != ARPHRD_TUNNEL6) &&
cc9da6cc
BM		 3102 (dev->type != ARPHRD_6LOWPAN) &&
3103 (dev->type != ARPHRD_NONE)) {
74235a25
HX		 3104 /* Alas, we support only Ethernet autoconfiguration. */
3105 return;
3106 }
3107
1da177e4 3108 idev = addrconf_add_dev(dev);
64e724f6 3109 if (IS_ERR(idev))
1da177e4
LT		 3110 return;
3111
cc9da6cc
BM		 3112 /* this device type has no EUI support */
3113 if (dev->type == ARPHRD_NONE &&
3114 idev->addr_gen_mode == IN6_ADDR_GEN_MODE_EUI64)
3115 idev->addr_gen_mode = IN6_ADDR_GEN_MODE_RANDOM;
3116
bc91b0f0 3117 addrconf_addr_gen(idev, false);
1da177e4
LT		 3118}
3119
07a93626 3120#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4
LT		 3121static void addrconf_sit_config(struct net_device *dev)
3122{
3123 struct inet6_dev *idev;
3124
3125 ASSERT_RTNL();
3126
1ab1457c
YH		 3127 /*
3128 * Configure the tunnel with one of our IPv4
3129 * addresses... we should configure all of
1da177e4
LT		 3130 * our v4 addrs in the tunnel
3131 */
3132
e5d08d71 3133 idev = ipv6_find_idev(dev);
63159f29 3134 if (!idev) {
91df42be 3135 pr_debug("%s: add_dev failed\n", __func__);
1da177e4
LT		 3136 return;
3137 }
3138
c7dc89c0 3139 if (dev->priv_flags & IFF_ISATAP) {
bc91b0f0 3140 addrconf_addr_gen(idev, false);
c7dc89c0
FT		 3141 return;
3142 }
3143
1da177e4
LT		 3144 sit_add_v4_addrs(idev);
3145
62b54dd9 3146 if (dev->flags&IFF_POINTOPOINT)
1da177e4 3147 addrconf_add_mroute(dev);
1da177e4 3148}
0be669bb 3149#endif
1da177e4 3150
07a93626 3151#if IS_ENABLED(CONFIG_NET_IPGRE)
aee80b54 3152static void addrconf_gre_config(struct net_device *dev)
3153{
3154 struct inet6_dev *idev;
aee80b54 3155
aee80b54 3156 ASSERT_RTNL();
3157
e5d08d71 3158 idev = ipv6_find_idev(dev);
63159f29 3159 if (!idev) {
91df42be 3160 pr_debug("%s: add_dev failed\n", __func__);
aee80b54 3161 return;
3162 }
3163
bc91b0f0 3164 addrconf_addr_gen(idev, true);
d9e4ce65
HFS		 3165 if (dev->flags & IFF_POINTOPOINT)
3166 addrconf_add_mroute(dev);
aee80b54 3167}
3168#endif
3169
1ab1457c 3170static int addrconf_notify(struct notifier_block *this, unsigned long event,
351638e7 3171 void *ptr)
1da177e4 3172{
351638e7 3173 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
748e2d93 3174 struct inet6_dev *idev = __in6_dev_get(dev);
c5e33bdd 3175 int run_pending = 0;
b217d616 3176 int err;
1da177e4 3177
e21e8467 3178 switch (event) {
45ba9dd2 3179 case NETDEV_REGISTER:
74235a25 3180 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
45ba9dd2 3181 idev = ipv6_add_dev(dev);
a317a2f1
WC		 3182 if (IS_ERR(idev))
3183 return notifier_from_errno(PTR_ERR(idev));
45ba9dd2
YH		 3184 }
3185 break;
bcdd553f 3186
b7b0b1d2
AD		 3187 case NETDEV_CHANGEMTU:
3188 /* if MTU under IPV6_MIN_MTU stop IPv6 on this interface. */
3189 if (dev->mtu < IPV6_MIN_MTU) {
3190 addrconf_ifdown(dev, 1);
3191 break;
3192 }
3193
3194 if (idev) {
3195 rt6_mtu_change(dev, dev->mtu);
3196 idev->cnf.mtu6 = dev->mtu;
3197 break;
3198 }
3199
3200 /* allocate new idev */
3201 idev = ipv6_add_dev(dev);
3202 if (IS_ERR(idev))
3203 break;
3204
3205 /* device is still not ready */
3206 if (!(idev->if_flags & IF_READY))
3207 break;
3208
3209 run_pending = 1;
3210
3211 /* fall through */
3212
1da177e4 3213 case NETDEV_UP:
3c21edbd 3214 case NETDEV_CHANGE:
c2edacf8
JV		 3215 if (dev->flags & IFF_SLAVE)
3216 break;
3217
3ce62a84
WC		 3218 if (idev && idev->cnf.disable_ipv6)
3219 break;
3220
3c21edbd 3221 if (event == NETDEV_UP) {
f24e3d65 3222 if (!addrconf_qdisc_ok(dev)) {
3c21edbd 3223 /* device is not ready yet. */
f3213831 3224 pr_info("ADDRCONF(NETDEV_UP): %s: link is not ready\n",
3c21edbd
YH		 3225 dev->name);
3226 break;
3227 }
99081049 3228
d31c7b8f
EP		 3229 if (!idev && dev->mtu >= IPV6_MIN_MTU)
3230 idev = ipv6_add_dev(dev);
3231
a317a2f1 3232 if (!IS_ERR_OR_NULL(idev)) {
99081049 3233 idev->if_flags |= IF_READY;
e3ec6cfc
BT		 3234 run_pending = 1;
3235 }
b7b0b1d2 3236 } else if (event == NETDEV_CHANGE) {
f24e3d65 3237 if (!addrconf_qdisc_ok(dev)) {
3c21edbd
YH		 3238 /* device is still not ready. */
3239 break;
3240 }
3241
3242 if (idev) {
bcdd553f 3243 if (idev->if_flags & IF_READY)
3c21edbd
YH		 3244 /* device is already configured. */
3245 break;
3c21edbd
YH		 3246 idev->if_flags |= IF_READY;
3247 }
3248
f3213831
JP		 3249 pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n",
3250 dev->name);
3c21edbd 3251
c5e33bdd 3252 run_pending = 1;
3c21edbd
YH		 3253 }
3254
e21e8467 3255 switch (dev->type) {
07a93626 3256#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4
LT		 3257 case ARPHRD_SIT:
3258 addrconf_sit_config(dev);
3259 break;
aee80b54 3260#endif
07a93626 3261#if IS_ENABLED(CONFIG_NET_IPGRE)
aee80b54 3262 case ARPHRD_IPGRE:
3263 addrconf_gre_config(dev);
3264 break;
0be669bb 3265#endif
1da177e4
LT		 3266 case ARPHRD_LOOPBACK:
3267 init_loopback(dev);
3268 break;
3269
3270 default:
3271 addrconf_dev_config(dev);
3272 break;
3ff50b79 3273 }
bcdd553f 3274
a317a2f1 3275 if (!IS_ERR_OR_NULL(idev)) {
c5e33bdd
YH		 3276 if (run_pending)
3277 addrconf_dad_run(idev);
3278
bcdd553f
SH		 3279 /*
3280 * If the MTU changed during the interface down,
3281 * when the interface up, the changed MTU must be
3282 * reflected in the idev as well as routers.
1da177e4 3283 */
bcdd553f
SH		 3284 if (idev->cnf.mtu6 != dev->mtu &&
3285 dev->mtu >= IPV6_MIN_MTU) {
1da177e4
LT		 3286 rt6_mtu_change(dev, dev->mtu);
3287 idev->cnf.mtu6 = dev->mtu;
3288 }
3289 idev->tstamp = jiffies;
3290 inet6_ifinfo_notify(RTM_NEWLINK, idev);
bcdd553f
SH		 3291
3292 /*
3293 * If the changed mtu during down is lower than
3294 * IPV6_MIN_MTU stop IPv6 on this interface.
1da177e4
LT		 3295 */
3296 if (dev->mtu < IPV6_MIN_MTU)
bcdd553f 3297 addrconf_ifdown(dev, 1);
1da177e4
LT		 3298 }
3299 break;
3300
1da177e4
LT		 3301 case NETDEV_DOWN:
3302 case NETDEV_UNREGISTER:
3303 /*
3304 * Remove all addresses from this interface.
3305 */
3306 addrconf_ifdown(dev, event != NETDEV_DOWN);
3307 break;
3c21edbd 3308
1da177e4 3309 case NETDEV_CHANGENAME:
1da177e4 3310 if (idev) {
5632c515 3311 snmp6_unregister_dev(idev);
408c4768 3312 addrconf_sysctl_unregister(idev);
a317a2f1 3313 err = addrconf_sysctl_register(idev);
b217d616
HX		 3314 if (err)
3315 return notifier_from_errno(err);
a317a2f1
WC		 3316 err = snmp6_register_dev(idev);
3317 if (err) {
3318 addrconf_sysctl_unregister(idev);
3319 return notifier_from_errno(err);
3320 }
5632c515 3321 }
1da177e4 3322 break;
bcdd553f 3323
93d9b7d7
JP		 3324 case NETDEV_PRE_TYPE_CHANGE:
3325 case NETDEV_POST_TYPE_CHANGE:
3ef0952c
AL		 3326 if (idev)
3327 addrconf_type_change(dev, event);
75c78500 3328 break;
3ff50b79 3329 }
1da177e4
LT		 3330
3331 return NOTIFY_OK;
3332}
3333
3334/*
3335 * addrconf module should be notified of a device going up
3336 */
3337static struct notifier_block ipv6_dev_notf = {
3338 .notifier_call = addrconf_notify,
1da177e4
LT		 3339};
3340
93d9b7d7 3341static void addrconf_type_change(struct net_device *dev, unsigned long event)
75c78500
MS		 3342{
3343 struct inet6_dev *idev;
3344 ASSERT_RTNL();
3345
3346 idev = __in6_dev_get(dev);
3347
93d9b7d7 3348 if (event == NETDEV_POST_TYPE_CHANGE)
75c78500 3349 ipv6_mc_remap(idev);
93d9b7d7 3350 else if (event == NETDEV_PRE_TYPE_CHANGE)
75c78500
MS		 3351 ipv6_mc_unmap(idev);
3352}
3353
1da177e4
LT		 3354static int addrconf_ifdown(struct net_device *dev, int how)
3355{
c346dca1 3356 struct net *net = dev_net(dev);
502a2ffd 3357 struct inet6_dev *idev;
3358 struct inet6_ifaddr *ifa;
73a8bd74 3359 int state, i;
1da177e4
LT		 3360
3361 ASSERT_RTNL();
3362
73a8bd74
DM		 3363 rt6_ifdown(net, dev);
3364 neigh_ifdown(&nd_tbl, dev);
1da177e4
LT		 3365
3366 idev = __in6_dev_get(dev);
63159f29 3367 if (!idev)
1da177e4
LT		 3368 return -ENODEV;
3369
bcdd553f
SH		 3370 /*
3371 * Step 1: remove reference to ipv6 device from parent device.
3372 * Do not dev_put!
1da177e4 3373 */
439e2385 3374 if (how) {
1da177e4 3375 idev->dead = 1;
8814c4b5
YH		 3376
3377 /* protected by rtnl_lock */
a9b3cd7f 3378 RCU_INIT_POINTER(dev->ip6_ptr, NULL);
1da177e4
LT		 3379
3380 /* Step 1.5: remove snmp6 entry */
3381 snmp6_unregister_dev(idev);
3382
3383 }
3384
73a8bd74
DM		 3385 /* Step 2: clear hash table */
3386 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3387 struct hlist_head *h = &inet6_addr_lst[i];
73a8bd74
DM		 3388
3389 spin_lock_bh(&addrconf_hash_lock);
67ba4152 3390restart:
b67bfe0d 3391 hlist_for_each_entry_rcu(ifa, h, addr_lst) {
73a8bd74
DM		 3392 if (ifa->idev == idev) {
3393 hlist_del_init_rcu(&ifa->addr_lst);
c15b1cca 3394 addrconf_del_dad_work(ifa);
73a8bd74
DM		 3395 goto restart;
3396 }
3397 }
3398 spin_unlock_bh(&addrconf_hash_lock);
3399 }
3400
1da177e4
LT		 3401 write_lock_bh(&idev->lock);
3402
b7b1bfce
HFS		 3403 addrconf_del_rs_timer(idev);
3404
bcdd553f 3405 /* Step 2: clear flags for stateless addrconf */
439e2385 3406 if (!how)
3c21edbd 3407 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
1da177e4 3408
439e2385 3409 if (how && del_timer(&idev->regen_timer))
1da177e4
LT		 3410 in6_dev_put(idev);
3411
bcdd553f 3412 /* Step 3: clear tempaddr list */
372e6c8f 3413 while (!list_empty(&idev->tempaddr_list)) {
3414 ifa = list_first_entry(&idev->tempaddr_list,
3415 struct inet6_ifaddr, tmp_list);
3416 list_del(&ifa->tmp_list);
1da177e4
LT		 3417 write_unlock_bh(&idev->lock);
3418 spin_lock_bh(&ifa->lock);
3419
3420 if (ifa->ifpub) {
3421 in6_ifa_put(ifa->ifpub);
3422 ifa->ifpub = NULL;
3423 }
3424 spin_unlock_bh(&ifa->lock);
3425 in6_ifa_put(ifa);
3426 write_lock_bh(&idev->lock);
3427 }
8f37ada5 3428
502a2ffd 3429 while (!list_empty(&idev->addr_list)) {
3430 ifa = list_first_entry(&idev->addr_list,
3431 struct inet6_ifaddr, if_list);
c15b1cca 3432 addrconf_del_dad_work(ifa);
84e8b803 3433
73a8bd74 3434 list_del(&ifa->if_list);
84e8b803 3435
73a8bd74 3436 write_unlock_bh(&idev->lock);
84e8b803 3437
8e8e676d 3438 spin_lock_bh(&ifa->lock);
73a8bd74
DM		 3439 state = ifa->state;
3440 ifa->state = INET6_IFADDR_STATE_DEAD;
8e8e676d 3441 spin_unlock_bh(&ifa->lock);
9d82ca98 3442
73a8bd74
DM		 3443 if (state != INET6_IFADDR_STATE_DEAD) {
3444 __ipv6_ifa_notify(RTM_DELADDR, ifa);
f88c91dd 3445 inet6addr_notifier_call_chain(NETDEV_DOWN, ifa);
27bdb2ab 3446 }
73a8bd74 3447 in6_ifa_put(ifa);
8f37ada5 3448
73a8bd74
DM		 3449 write_lock_bh(&idev->lock);
3450 }
8f37ada5 3451
1da177e4
LT		 3452 write_unlock_bh(&idev->lock);
3453
381f4dca
SD		 3454 /* Step 5: Discard anycast and multicast list */
3455 if (how) {
3456 ipv6_ac_destroy_dev(idev);
1da177e4 3457 ipv6_mc_destroy_dev(idev);
381f4dca 3458 } else {
1da177e4 3459 ipv6_mc_down(idev);
381f4dca 3460 }
1da177e4 3461
1da177e4 3462 idev->tstamp = jiffies;
1ab1457c 3463
bcdd553f 3464 /* Last: Shot the device (if unregistered) */
439e2385 3465 if (how) {
408c4768 3466 addrconf_sysctl_unregister(idev);
1da177e4
LT		 3467 neigh_parms_release(&nd_tbl, idev->nd_parms);
3468 neigh_ifdown(&nd_tbl, dev);
3469 in6_dev_put(idev);
3470 }
3471 return 0;
3472}
3473
3474static void addrconf_rs_timer(unsigned long data)
3475{
b7b1bfce 3476 struct inet6_dev *idev = (struct inet6_dev *)data;
caf92bc4 3477 struct net_device *dev = idev->dev;
b7b1bfce 3478 struct in6_addr lladdr;
1da177e4 3479
b7b1bfce 3480 write_lock(&idev->lock);
5b2a1953 3481 if (idev->dead || !(idev->if_flags & IF_READY))
1da177e4
LT		 3482 goto out;
3483
9ba2add3 3484 if (!ipv6_accept_ra(idev))
5b2a1953 3485 goto out;
3486
3487 /* Announcement received after solicitation was sent */
3488 if (idev->if_flags & IF_RA_RCVD)
1da177e4 3489 goto out;
1da177e4 3490
b7b1bfce 3491 if (idev->rs_probes++ < idev->cnf.rtr_solicits) {
caf92bc4
CW		 3492 write_unlock(&idev->lock);
3493 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
3494 ndisc_send_rs(dev, &lladdr,
b7b1bfce
HFS		 3495 &in6addr_linklocal_allrouters);
3496 else
caf92bc4 3497 goto put;
1da177e4 3498
caf92bc4 3499 write_lock(&idev->lock);
b7b1bfce
HFS		 3500 /* The wait after the last probe can be shorter */
3501 addrconf_mod_rs_timer(idev, (idev->rs_probes ==
3502 idev->cnf.rtr_solicits) ?
3503 idev->cnf.rtr_solicit_delay :
3504 idev->cnf.rtr_solicit_interval);
1da177e4 3505 } else {
1da177e4
LT		 3506 /*
3507 * Note: we do not support deprecated "all on-link"
3508 * assumption any longer.
3509 */
91df42be 3510 pr_debug("%s: no IPv6 routers present\n", idev->dev->name);
1da177e4
LT		 3511 }
3512
3513out:
b7b1bfce 3514 write_unlock(&idev->lock);
caf92bc4 3515put:
b7b1bfce 3516 in6_dev_put(idev);
1da177e4
LT		 3517}
3518
3519/*
3520 * Duplicate Address Detection
3521 */
3c21edbd
YH		 3522static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
3523{
3524 unsigned long rand_num;
3525 struct inet6_dev *idev = ifp->idev;
3526
95c385b4
NH		 3527 if (ifp->flags & IFA_F_OPTIMISTIC)
3528 rand_num = 0;
3529 else
63862b5b 3530 rand_num = prandom_u32() % (idev->cnf.rtr_solicit_delay ? : 1);
95c385b4 3531
b7b1bfce 3532 ifp->dad_probes = idev->cnf.dad_transmits;
c15b1cca 3533 addrconf_mod_dad_work(ifp, rand_num);
3c21edbd
YH		 3534}
3535
c15b1cca 3536static void addrconf_dad_begin(struct inet6_ifaddr *ifp)
1da177e4
LT		 3537{
3538 struct inet6_dev *idev = ifp->idev;
3539 struct net_device *dev = idev->dev;
1da177e4
LT		 3540
3541 addrconf_join_solict(dev, &ifp->addr);
3542
63862b5b 3543 prandom_seed((__force u32) ifp->addr.s6_addr32[3]);
1da177e4
LT		 3544
3545 read_lock_bh(&idev->lock);
622ccdf1 3546 spin_lock(&ifp->lock);
e9d3e084 3547 if (ifp->state == INET6_IFADDR_STATE_DEAD)
1da177e4 3548 goto out;
1da177e4
LT		 3549
3550 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
1b34be74 3551 idev->cnf.accept_dad < 1 ||
55ebaef1
NT		 3552 !(ifp->flags&IFA_F_TENTATIVE) ||
3553 ifp->flags & IFA_F_NODAD) {
cc411d0b 3554 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
21809faf 3555 spin_unlock(&ifp->lock);
1da177e4
LT		 3556 read_unlock_bh(&idev->lock);
3557
3558 addrconf_dad_completed(ifp);
3559 return;
3560 }
3561
6732bade 3562 if (!(idev->if_flags & IF_READY)) {
21809faf 3563 spin_unlock(&ifp->lock);
6732bade 3564 read_unlock_bh(&idev->lock);
3c21edbd 3565 /*
590a9887 3566 * If the device is not ready:
3c21edbd
YH		 3567 * - keep it tentative if it is a permanent address.
3568 * - otherwise, kill it.
3569 */
3570 in6_ifa_hold(ifp);
cc411d0b 3571 addrconf_dad_stop(ifp, 0);
6732bade 3572 return;
3c21edbd 3573 }
95c385b4
NH		 3574
3575 /*
3576 * Optimistic nodes can start receiving
3577 * Frames right away
3578 */
7fd2561e 3579 if (ifp->flags & IFA_F_OPTIMISTIC) {
95c385b4 3580 ip6_ins_rt(ifp->rt);
7fd2561e
EK		 3581 if (ipv6_use_optimistic_addr(idev)) {
3582 /* Because optimistic nodes can use this address,
3583 * notify listeners. If DAD fails, RTM_DELADDR is sent.
3584 */
3585 ipv6_ifa_notify(RTM_NEWADDR, ifp);
3586 }
3587 }
95c385b4 3588
6732bade 3589 addrconf_dad_kick(ifp);
1da177e4 3590out:
622ccdf1 3591 spin_unlock(&ifp->lock);
1da177e4
LT		 3592 read_unlock_bh(&idev->lock);
3593}
3594
c15b1cca 3595static void addrconf_dad_start(struct inet6_ifaddr *ifp)
1da177e4 3596{
c15b1cca
HFS		 3597 bool begin_dad = false;
3598
8e8e676d 3599 spin_lock_bh(&ifp->lock);
c15b1cca
HFS		 3600 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
3601 ifp->state = INET6_IFADDR_STATE_PREDAD;
3602 begin_dad = true;
3603 }
8e8e676d 3604 spin_unlock_bh(&ifp->lock);
c15b1cca
HFS		 3605
3606 if (begin_dad)
3607 addrconf_mod_dad_work(ifp, 0);
3608}
3609
3610static void addrconf_dad_work(struct work_struct *w)
3611{
3612 struct inet6_ifaddr *ifp = container_of(to_delayed_work(w),
3613 struct inet6_ifaddr,
3614 dad_work);
1da177e4 3615 struct inet6_dev *idev = ifp->idev;
1da177e4
LT		 3616 struct in6_addr mcaddr;
3617
c15b1cca
HFS		 3618 enum {
3619 DAD_PROCESS,
3620 DAD_BEGIN,
3621 DAD_ABORT,
3622 } action = DAD_PROCESS;
3623
3624 rtnl_lock();
3625
8e8e676d 3626 spin_lock_bh(&ifp->lock);
c15b1cca
HFS		 3627 if (ifp->state == INET6_IFADDR_STATE_PREDAD) {
3628 action = DAD_BEGIN;
3629 ifp->state = INET6_IFADDR_STATE_DAD;
3630 } else if (ifp->state == INET6_IFADDR_STATE_ERRDAD) {
3631 action = DAD_ABORT;
3632 ifp->state = INET6_IFADDR_STATE_POSTDAD;
3633 }
8e8e676d 3634 spin_unlock_bh(&ifp->lock);
c15b1cca
HFS		 3635
3636 if (action == DAD_BEGIN) {
3637 addrconf_dad_begin(ifp);
3638 goto out;
3639 } else if (action == DAD_ABORT) {
3640 addrconf_dad_stop(ifp, 1);
3641 goto out;
3642 }
3643
b7b1bfce 3644 if (!ifp->dad_probes && addrconf_dad_end(ifp))
f2344a13
HX		 3645 goto out;
3646
c15b1cca 3647 write_lock_bh(&idev->lock);
122e4519 3648 if (idev->dead || !(idev->if_flags & IF_READY)) {
c15b1cca 3649 write_unlock_bh(&idev->lock);
1da177e4
LT		 3650 goto out;
3651 }
21809faf 3652
3653 spin_lock(&ifp->lock);
622ccdf1
HX		 3654 if (ifp->state == INET6_IFADDR_STATE_DEAD) {
3655 spin_unlock(&ifp->lock);
c15b1cca 3656 write_unlock_bh(&idev->lock);
622ccdf1
HX		 3657 goto out;
3658 }
3659
b7b1bfce 3660 if (ifp->dad_probes == 0) {
1da177e4
LT		 3661 /*
3662 * DAD was successful
3663 */
3664
cc411d0b 3665 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
21809faf 3666 spin_unlock(&ifp->lock);
c15b1cca 3667 write_unlock_bh(&idev->lock);
1da177e4
LT		 3668
3669 addrconf_dad_completed(ifp);
3670
3671 goto out;
3672 }
3673
b7b1bfce 3674 ifp->dad_probes--;
c15b1cca
HFS		 3675 addrconf_mod_dad_work(ifp,
3676 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME));
21809faf 3677 spin_unlock(&ifp->lock);
c15b1cca 3678 write_unlock_bh(&idev->lock);
1da177e4
LT		 3679
3680 /* send a neighbour solicitation for our addr */
1da177e4 3681 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
304d888b 3682 ndisc_send_ns(ifp->idev->dev, &ifp->addr, &mcaddr, &in6addr_any);
1da177e4
LT		 3683out:
3684 in6_ifa_put(ifp);
c15b1cca 3685 rtnl_unlock();
1da177e4
LT		 3686}
3687
11ffff75
HFS		 3688/* ifp->idev must be at least read locked */
3689static bool ipv6_lonely_lladdr(struct inet6_ifaddr *ifp)
3690{
3691 struct inet6_ifaddr *ifpiter;
3692 struct inet6_dev *idev = ifp->idev;
3693
602582ca
HFS		 3694 list_for_each_entry_reverse(ifpiter, &idev->addr_list, if_list) {
3695 if (ifpiter->scope > IFA_LINK)
3696 break;
11ffff75
HFS		 3697 if (ifp != ifpiter && ifpiter->scope == IFA_LINK &&
3698 (ifpiter->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE|
3699 IFA_F_OPTIMISTIC|IFA_F_DADFAILED)) ==
3700 IFA_F_PERMANENT)
3701 return false;
3702 }
3703 return true;
3704}
3705
1da177e4
LT		 3706static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
3707{
e21e8467 3708 struct net_device *dev = ifp->idev->dev;
b7b1bfce 3709 struct in6_addr lladdr;
b173ee48 3710 bool send_rs, send_mld;
b7b1bfce 3711
c15b1cca 3712 addrconf_del_dad_work(ifp);
1da177e4
LT		 3713
3714 /*
3715 * Configure the address for reception. Now it is valid.
3716 */
3717
3718 ipv6_ifa_notify(RTM_NEWADDR, ifp);
3719
026359bc
TA		 3720 /* If added prefix is link local and we are prepared to process
3721 router advertisements, start sending router solicitations.
1da177e4
LT		 3722 */
3723
1ec047eb 3724 read_lock_bh(&ifp->idev->lock);
11ffff75 3725 send_mld = ifp->scope == IFA_LINK && ipv6_lonely_lladdr(ifp);
b173ee48
HFS		 3726 send_rs = send_mld &&
3727 ipv6_accept_ra(ifp->idev) &&
1ec047eb 3728 ifp->idev->cnf.rtr_solicits > 0 &&
b173ee48 3729 (dev->flags&IFF_LOOPBACK) == 0;
1ec047eb
HFS		 3730 read_unlock_bh(&ifp->idev->lock);
3731
b173ee48
HFS		 3732 /* While dad is in progress mld report's source address is in6_addrany.
3733 * Resend with proper ll now.
3734 */
3735 if (send_mld)
3736 ipv6_mc_dad_complete(ifp->idev);
3737
1ec047eb 3738 if (send_rs) {
1da177e4
LT		 3739 /*
3740 * If a host as already performed a random delay
3741 * [...] as part of DAD [...] there is no need
3742 * to delay again before sending the first RS
3743 */
1ec047eb 3744 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
b7b1bfce 3745 return;
1ec047eb 3746 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters);
1da177e4 3747
b7b1bfce
HFS		 3748 write_lock_bh(&ifp->idev->lock);
3749 spin_lock(&ifp->lock);
3750 ifp->idev->rs_probes = 1;
1da177e4 3751 ifp->idev->if_flags |= IF_RS_SENT;
b7b1bfce
HFS		 3752 addrconf_mod_rs_timer(ifp->idev,
3753 ifp->idev->cnf.rtr_solicit_interval);
3754 spin_unlock(&ifp->lock);
3755 write_unlock_bh(&ifp->idev->lock);
1da177e4
LT		 3756 }
3757}
3758
e21e8467
SH		 3759static void addrconf_dad_run(struct inet6_dev *idev)
3760{
c5e33bdd
YH		 3761 struct inet6_ifaddr *ifp;
3762
3763 read_lock_bh(&idev->lock);
502a2ffd 3764 list_for_each_entry(ifp, &idev->addr_list, if_list) {
21809faf 3765 spin_lock(&ifp->lock);
f2344a13
HX		 3766 if (ifp->flags & IFA_F_TENTATIVE &&
3767 ifp->state == INET6_IFADDR_STATE_DAD)
3768 addrconf_dad_kick(ifp);
21809faf 3769 spin_unlock(&ifp->lock);
c5e33bdd
YH		 3770 }
3771 read_unlock_bh(&idev->lock);
3772}
3773
1da177e4
LT		 3774#ifdef CONFIG_PROC_FS
3775struct if6_iter_state {
3c40090a 3776 struct seq_net_private p;
1da177e4 3777 int bucket;
1d578303 3778 int offset;
1da177e4
LT		 3779};
3780
1d578303 3781static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos)
1da177e4
LT		 3782{
3783 struct inet6_ifaddr *ifa = NULL;
3784 struct if6_iter_state *state = seq->private;
1218854a 3785 struct net *net = seq_file_net(seq);
1d578303 3786 int p = 0;
1da177e4 3787
1d578303
MM		 3788 /* initial bucket if pos is 0 */
3789 if (pos == 0) {
3790 state->bucket = 0;
3791 state->offset = 0;
3792 }
3793
3794 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
b67bfe0d 3795 hlist_for_each_entry_rcu_bh(ifa, &inet6_addr_lst[state->bucket],
1d578303 3796 addr_lst) {
9f0d3c27
ED		 3797 if (!net_eq(dev_net(ifa->idev->dev), net))
3798 continue;
1d578303
MM		 3799 /* sync with offset */
3800 if (p < state->offset) {
3801 p++;
3802 continue;
3803 }
3804 state->offset++;
9f0d3c27 3805 return ifa;
1d578303
MM		 3806 }
3807
3808 /* prepare for next bucket */
3809 state->offset = 0;
3810 p = 0;
1da177e4 3811 }
c2e21293 3812 return NULL;
1da177e4
LT		 3813}
3814
c2e21293 3815static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
3816 struct inet6_ifaddr *ifa)
1da177e4
LT		 3817{
3818 struct if6_iter_state *state = seq->private;
1218854a 3819 struct net *net = seq_file_net(seq);
1da177e4 3820
b67bfe0d 3821 hlist_for_each_entry_continue_rcu_bh(ifa, addr_lst) {
9f0d3c27
ED		 3822 if (!net_eq(dev_net(ifa->idev->dev), net))
3823 continue;
1d578303 3824 state->offset++;
9f0d3c27 3825 return ifa;
1d578303 3826 }
3c40090a 3827
c2e21293 3828 while (++state->bucket < IN6_ADDR_HSIZE) {
1d578303 3829 state->offset = 0;
b67bfe0d 3830 hlist_for_each_entry_rcu_bh(ifa,
c2e21293 3831 &inet6_addr_lst[state->bucket], addr_lst) {
9f0d3c27
ED		 3832 if (!net_eq(dev_net(ifa->idev->dev), net))
3833 continue;
1d578303 3834 state->offset++;
9f0d3c27 3835 return ifa;
c2e21293 3836 }
1da177e4 3837 }
3c40090a 3838
c2e21293 3839 return NULL;
1da177e4
LT		 3840}
3841
1da177e4 3842static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
4f70ecca 3843 __acquires(rcu_bh)
1da177e4 3844{
5c578aed 3845 rcu_read_lock_bh();
1d578303 3846 return if6_get_first(seq, *pos);
1da177e4
LT		 3847}
3848
3849static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3850{
3851 struct inet6_ifaddr *ifa;
3852
3853 ifa = if6_get_next(seq, v);
3854 ++*pos;
3855 return ifa;
3856}
3857
3858static void if6_seq_stop(struct seq_file *seq, void *v)
4f70ecca 3859 __releases(rcu_bh)
1da177e4 3860{
5c578aed 3861 rcu_read_unlock_bh();
1da177e4
LT		 3862}
3863
3864static int if6_seq_show(struct seq_file *seq, void *v)
3865{
3866 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
971a351c 3867 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
b071195d 3868 &ifp->addr,
1da177e4
LT		 3869 ifp->idev->dev->ifindex,
3870 ifp->prefix_len,
3871 ifp->scope,
971a351c 3872 (u8) ifp->flags,
1da177e4
LT		 3873 ifp->idev->dev->name);
3874 return 0;
3875}
3876
56b3d975 3877static const struct seq_operations if6_seq_ops = {
1da177e4
LT		 3878 .start = if6_seq_start,
3879 .next = if6_seq_next,
3880 .show = if6_seq_show,
3881 .stop = if6_seq_stop,
3882};
3883
3884static int if6_seq_open(struct inode *inode, struct file *file)
3885{
3c40090a
DL		 3886 return seq_open_net(inode, file, &if6_seq_ops,
3887 sizeof(struct if6_iter_state));
1da177e4
LT		 3888}
3889
9a32144e 3890static const struct file_operations if6_fops = {
1da177e4
LT		 3891 .owner = THIS_MODULE,
3892 .open = if6_seq_open,
3893 .read = seq_read,
3894 .llseek = seq_lseek,
3c40090a 3895 .release = seq_release_net,
1da177e4
LT		 3896};
3897
2c8c1e72 3898static int __net_init if6_proc_net_init(struct net *net)
1da177e4 3899{
d4beaa66 3900 if (!proc_create("if_inet6", S_IRUGO, net->proc_net, &if6_fops))
1da177e4
LT		 3901 return -ENOMEM;
3902 return 0;
3903}
3904
2c8c1e72 3905static void __net_exit if6_proc_net_exit(struct net *net)
3c40090a 3906{
ece31ffd 3907 remove_proc_entry("if_inet6", net->proc_net);
3c40090a
DL		 3908}
3909
3910static struct pernet_operations if6_proc_net_ops = {
67ba4152
IM		 3911 .init = if6_proc_net_init,
3912 .exit = if6_proc_net_exit,
3c40090a
DL		 3913};
3914
3915int __init if6_proc_init(void)
3916{
3917 return register_pernet_subsys(&if6_proc_net_ops);
3918}
3919
1da177e4
LT		 3920void if6_proc_exit(void)
3921{
3c40090a 3922 unregister_pernet_subsys(&if6_proc_net_ops);
1da177e4
LT		 3923}
3924#endif /* CONFIG_PROC_FS */
3925
07a93626 3926#if IS_ENABLED(CONFIG_IPV6_MIP6)
3b9f9a1c 3927/* Check if address is a home address configured on any interface. */
b71d1d42 3928int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr)
3b9f9a1c
NT		 3929{
3930 int ret = 0;
c2e21293 3931 struct inet6_ifaddr *ifp = NULL;
ddbe5032 3932 unsigned int hash = inet6_addr_hash(addr);
c2e21293 3933
5c578aed 3934 rcu_read_lock_bh();
b67bfe0d 3935 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
878628fb 3936 if (!net_eq(dev_net(ifp->idev->dev), net))
389f6612 3937 continue;
caad295f 3938 if (ipv6_addr_equal(&ifp->addr, addr) &&
3b9f9a1c
NT		 3939 (ifp->flags & IFA_F_HOMEADDRESS)) {
3940 ret = 1;
3941 break;
3942 }
3943 }
5c578aed 3944 rcu_read_unlock_bh();
3b9f9a1c
NT		 3945 return ret;
3946}
3947#endif
3948
1da177e4
LT		 3949/*
3950 * Periodic address status verification
3951 */
3952
c15b1cca 3953static void addrconf_verify_rtnl(void)
1da177e4 3954{
b2db7564 3955 unsigned long now, next, next_sec, next_sched;
1da177e4 3956 struct inet6_ifaddr *ifp;
1da177e4
LT		 3957 int i;
3958
c15b1cca
HFS		 3959 ASSERT_RTNL();
3960
5c578aed 3961 rcu_read_lock_bh();
1da177e4 3962 now = jiffies;
b2db7564 3963 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
1da177e4 3964
c15b1cca 3965 cancel_delayed_work(&addr_chk_work);
1da177e4 3966
bcdd553f 3967 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
1da177e4 3968restart:
c15b1cca 3969 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[i], addr_lst) {
1da177e4 3970 unsigned long age;
1da177e4 3971
fad8da3e
YA		 3972 /* When setting preferred_lft to a value not zero or
3973 * infinity, while valid_lft is infinity
3974 * IFA_F_PERMANENT has a non-infinity life time.
3975 */
3976 if ((ifp->flags & IFA_F_PERMANENT) &&
3977 (ifp->prefered_lft == INFINITY_LIFE_TIME))
1da177e4
LT		 3978 continue;
3979
3980 spin_lock(&ifp->lock);
b2db7564
YH		 3981 /* We try to batch several events at once. */
3982 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
1da177e4 3983
8f27ebb9
YH		 3984 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
3985 age >= ifp->valid_lft) {
1da177e4
LT		 3986 spin_unlock(&ifp->lock);
3987 in6_ifa_hold(ifp);
1da177e4
LT		 3988 ipv6_del_addr(ifp);
3989 goto restart;
8f27ebb9
YH		 3990 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
3991 spin_unlock(&ifp->lock);
3992 continue;
1da177e4 3993 } else if (age >= ifp->prefered_lft) {
a1ed0526 3994 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
1da177e4
LT		 3995 int deprecate = 0;
3996
3997 if (!(ifp->flags&IFA_F_DEPRECATED)) {
3998 deprecate = 1;
3999 ifp->flags |= IFA_F_DEPRECATED;
4000 }
4001
fad8da3e
YA		 4002 if ((ifp->valid_lft != INFINITY_LIFE_TIME) &&
4003 (time_before(ifp->tstamp + ifp->valid_lft * HZ, next)))
1da177e4
LT		 4004 next = ifp->tstamp + ifp->valid_lft * HZ;
4005
4006 spin_unlock(&ifp->lock);
4007
4008 if (deprecate) {
4009 in6_ifa_hold(ifp);
1da177e4
LT		 4010
4011 ipv6_ifa_notify(0, ifp);
4012 in6_ifa_put(ifp);
4013 goto restart;
4014 }
1da177e4
LT		 4015 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
4016 !(ifp->flags&IFA_F_TENTATIVE)) {
88949cf4 4017 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
4018 ifp->idev->cnf.dad_transmits *
1f9248e5 4019 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME) / HZ;
88949cf4 4020
1da177e4
LT		 4021 if (age >= ifp->prefered_lft - regen_advance) {
4022 struct inet6_ifaddr *ifpub = ifp->ifpub;
4023 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
4024 next = ifp->tstamp + ifp->prefered_lft * HZ;
4025 if (!ifp->regen_count && ifpub) {
4026 ifp->regen_count++;
4027 in6_ifa_hold(ifp);
4028 in6_ifa_hold(ifpub);
4029 spin_unlock(&ifp->lock);
5c578aed 4030
291d809b
HY		 4031 spin_lock(&ifpub->lock);
4032 ifpub->regen_count = 0;
4033 spin_unlock(&ifpub->lock);
1da177e4
LT		 4034 ipv6_create_tempaddr(ifpub, ifp);
4035 in6_ifa_put(ifpub);
4036 in6_ifa_put(ifp);
4037 goto restart;
4038 }
4039 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
4040 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
4041 spin_unlock(&ifp->lock);
1da177e4
LT		 4042 } else {
4043 /* ifp->prefered_lft <= ifp->valid_lft */
4044 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
4045 next = ifp->tstamp + ifp->prefered_lft * HZ;
4046 spin_unlock(&ifp->lock);
4047 }
4048 }
1da177e4
LT		 4049 }
4050
b2db7564
YH		 4051 next_sec = round_jiffies_up(next);
4052 next_sched = next;
4053
4054 /* If rounded timeout is accurate enough, accept it. */
4055 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
4056 next_sched = next_sec;
4057
4058 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
4059 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
4060 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
4061
ba3542e1 4062 ADBG(KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
4063 now, next, next_sec, next_sched);
c15b1cca 4064 mod_delayed_work(addrconf_wq, &addr_chk_work, next_sched - now);
5c578aed 4065 rcu_read_unlock_bh();
1da177e4
LT		 4066}
4067
c15b1cca
HFS		 4068static void addrconf_verify_work(struct work_struct *w)
4069{
4070 rtnl_lock();
4071 addrconf_verify_rtnl();
4072 rtnl_unlock();
4073}
4074
4075static void addrconf_verify(void)
4076{
4077 mod_delayed_work(addrconf_wq, &addr_chk_work, 0);
4078}
4079
caeaba79
ND		 4080static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local,
4081 struct in6_addr **peer_pfx)
461d8837
TG		 4082{
4083 struct in6_addr *pfx = NULL;
4084
caeaba79
ND		 4085 *peer_pfx = NULL;
4086
461d8837
TG		 4087 if (addr)
4088 pfx = nla_data(addr);
4089
4090 if (local) {
4091 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
caeaba79
ND		 4092 *peer_pfx = pfx;
4093 pfx = nla_data(local);
461d8837
TG		 4094 }
4095
4096 return pfx;
4097}
4098
ef7c79ed 4099static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
461d8837
TG		 4100 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
4101 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
4102 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
479840ff 4103 [IFA_FLAGS] = { .len = sizeof(u32) },
461d8837
TG		 4104};
4105
1da177e4 4106static int
661d2967 4107inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh)
1da177e4 4108{
3b1e0a65 4109 struct net *net = sock_net(skb->sk);
b933f716
TG		 4110 struct ifaddrmsg *ifm;
4111 struct nlattr *tb[IFA_MAX+1];
caeaba79 4112 struct in6_addr *pfx, *peer_pfx;
6046d5b4 4113 u32 ifa_flags;
b933f716 4114 int err;
1da177e4 4115
b933f716
TG		 4116 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
4117 if (err < 0)
4118 return err;
4119
4120 ifm = nlmsg_data(nlh);
caeaba79 4121 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
63159f29 4122 if (!pfx)
1da177e4
LT		 4123 return -EINVAL;
4124
6046d5b4
HK		 4125 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
4126
4127 /* We ignore other flags so far. */
4128 ifa_flags &= IFA_F_MANAGETEMPADDR;
4129
4130 return inet6_addr_del(net, ifm->ifa_index, ifa_flags, pfx,
4131 ifm->ifa_prefixlen);
1da177e4
LT		 4132}
4133
479840ff 4134static int inet6_addr_modify(struct inet6_ifaddr *ifp, u32 ifa_flags,
55ebaef1 4135 u32 prefered_lft, u32 valid_lft)
081bba5b 4136{
6f704992
YH		 4137 u32 flags;
4138 clock_t expires;
4bed72e4 4139 unsigned long timeout;
53bd6749 4140 bool was_managetempaddr;
5b84efec 4141 bool had_prefixroute;
46d48046 4142
c15b1cca
HFS		 4143 ASSERT_RTNL();
4144
081bba5b
NT		 4145 if (!valid_lft || (prefered_lft > valid_lft))
4146 return -EINVAL;
4147
53bd6749
JP		 4148 if (ifa_flags & IFA_F_MANAGETEMPADDR &&
4149 (ifp->flags & IFA_F_TEMPORARY || ifp->prefix_len != 64))
4150 return -EINVAL;
4151
4bed72e4
YH		 4152 timeout = addrconf_timeout_fixup(valid_lft, HZ);
4153 if (addrconf_finite_timeout(timeout)) {
4154 expires = jiffies_to_clock_t(timeout * HZ);
4155 valid_lft = timeout;
6f704992 4156 flags = RTF_EXPIRES;
4bed72e4
YH		 4157 } else {
4158 expires = 0;
4159 flags = 0;
4160 ifa_flags |= IFA_F_PERMANENT;
6f704992 4161 }
081bba5b 4162
4bed72e4
YH		 4163 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
4164 if (addrconf_finite_timeout(timeout)) {
4165 if (timeout == 0)
4166 ifa_flags |= IFA_F_DEPRECATED;
4167 prefered_lft = timeout;
4168 }
081bba5b
NT		 4169
4170 spin_lock_bh(&ifp->lock);
53bd6749 4171 was_managetempaddr = ifp->flags & IFA_F_MANAGETEMPADDR;
5b84efec
TH		 4172 had_prefixroute = ifp->flags & IFA_F_PERMANENT &&
4173 !(ifp->flags & IFA_F_NOPREFIXROUTE);
53bd6749 4174 ifp->flags &= ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD |
761aac73
TH		 4175 IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
4176 IFA_F_NOPREFIXROUTE);
53bd6749 4177 ifp->flags |= ifa_flags;
081bba5b
NT		 4178 ifp->tstamp = jiffies;
4179 ifp->valid_lft = valid_lft;
4180 ifp->prefered_lft = prefered_lft;
4181
4182 spin_unlock_bh(&ifp->lock);
4183 if (!(ifp->flags&IFA_F_TENTATIVE))
4184 ipv6_ifa_notify(0, ifp);
081bba5b 4185
761aac73
TH		 4186 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) {
4187 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
4188 expires, flags);
5b84efec
TH		 4189 } else if (had_prefixroute) {
4190 enum cleanup_prefix_rt_t action;
4191 unsigned long rt_expires;
4192
4193 write_lock_bh(&ifp->idev->lock);
4194 action = check_cleanup_prefix_route(ifp, &rt_expires);
4195 write_unlock_bh(&ifp->idev->lock);
4196
4197 if (action != CLEANUP_PREFIX_RT_NOP) {
4198 cleanup_prefix_route(ifp, rt_expires,
4199 action == CLEANUP_PREFIX_RT_DEL);
4200 }
761aac73 4201 }
53bd6749
JP		 4202
4203 if (was_managetempaddr || ifp->flags & IFA_F_MANAGETEMPADDR) {
4204 if (was_managetempaddr && !(ifp->flags & IFA_F_MANAGETEMPADDR))
4205 valid_lft = prefered_lft = 0;
4206 manage_tempaddrs(ifp->idev, ifp, valid_lft, prefered_lft,
4207 !was_managetempaddr, jiffies);
4208 }
4209
c15b1cca 4210 addrconf_verify_rtnl();
081bba5b
NT		 4211
4212 return 0;
4213}
4214
1da177e4 4215static int
661d2967 4216inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh)
1da177e4 4217{
3b1e0a65 4218 struct net *net = sock_net(skb->sk);
461d8837
TG		 4219 struct ifaddrmsg *ifm;
4220 struct nlattr *tb[IFA_MAX+1];
caeaba79 4221 struct in6_addr *pfx, *peer_pfx;
7198f8ce
TG		 4222 struct inet6_ifaddr *ifa;
4223 struct net_device *dev;
55ebaef1 4224 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
479840ff 4225 u32 ifa_flags;
461d8837 4226 int err;
1da177e4 4227
461d8837
TG		 4228 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
4229 if (err < 0)
4230 return err;
4231
4232 ifm = nlmsg_data(nlh);
caeaba79 4233 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
63159f29 4234 if (!pfx)
1da177e4
LT		 4235 return -EINVAL;
4236
461d8837 4237 if (tb[IFA_CACHEINFO]) {
0778769d 4238 struct ifa_cacheinfo *ci;
461d8837
TG		 4239
4240 ci = nla_data(tb[IFA_CACHEINFO]);
0778769d 4241 valid_lft = ci->ifa_valid;
461d8837
TG		 4242 preferred_lft = ci->ifa_prefered;
4243 } else {
4244 preferred_lft = INFINITY_LIFE_TIME;
4245 valid_lft = INFINITY_LIFE_TIME;
0778769d
NT		 4246 }
4247
af284937 4248 dev = __dev_get_by_index(net, ifm->ifa_index);
63159f29 4249 if (!dev)
7198f8ce
TG		 4250 return -ENODEV;
4251
479840ff
JP		 4252 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
4253
55ebaef1 4254 /* We ignore other flags so far. */
761aac73 4255 ifa_flags &= IFA_F_NODAD | IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
93a714d6 4256 IFA_F_NOPREFIXROUTE | IFA_F_MCAUTOJOIN;
55ebaef1 4257
1cab3da6 4258 ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
63159f29 4259 if (!ifa) {
7198f8ce
TG		 4260 /*
4261 * It would be best to check for !NLM_F_CREATE here but
db9c7c39 4262 * userspace already relies on not having to provide this.
7198f8ce 4263 */
caeaba79 4264 return inet6_addr_add(net, ifm->ifa_index, pfx, peer_pfx,
af284937
DL		 4265 ifm->ifa_prefixlen, ifa_flags,
4266 preferred_lft, valid_lft);
081bba5b
NT		 4267 }
4268
7198f8ce
TG		 4269 if (nlh->nlmsg_flags & NLM_F_EXCL ||
4270 !(nlh->nlmsg_flags & NLM_F_REPLACE))
4271 err = -EEXIST;
4272 else
55ebaef1 4273 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
7198f8ce
TG		 4274
4275 in6_ifa_put(ifa);
4276
4277 return err;
1da177e4
LT		 4278}
4279
479840ff 4280static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u32 flags,
101bb229
TG		 4281 u8 scope, int ifindex)
4282{
4283 struct ifaddrmsg *ifm;
4284
4285 ifm = nlmsg_data(nlh);
4286 ifm->ifa_family = AF_INET6;
4287 ifm->ifa_prefixlen = prefixlen;
4288 ifm->ifa_flags = flags;
4289 ifm->ifa_scope = scope;
4290 ifm->ifa_index = ifindex;
4291}
4292
85486af0
TG		 4293static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
4294 unsigned long tstamp, u32 preferred, u32 valid)
4295{
4296 struct ifa_cacheinfo ci;
4297
18a31e1e
TG		 4298 ci.cstamp = cstamp_delta(cstamp);
4299 ci.tstamp = cstamp_delta(tstamp);
85486af0
TG		 4300 ci.ifa_prefered = preferred;
4301 ci.ifa_valid = valid;
4302
4303 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
4304}
4305
101bb229
TG		 4306static inline int rt_scope(int ifa_scope)
4307{
4308 if (ifa_scope & IFA_HOST)
4309 return RT_SCOPE_HOST;
4310 else if (ifa_scope & IFA_LINK)
4311 return RT_SCOPE_LINK;
4312 else if (ifa_scope & IFA_SITE)
4313 return RT_SCOPE_SITE;
4314 else
4315 return RT_SCOPE_UNIVERSE;
4316}
4317
0ab6803b
TG		 4318static inline int inet6_ifaddr_msgsize(void)
4319{
339bf98f 4320 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
caeaba79 4321 + nla_total_size(16) /* IFA_LOCAL */
339bf98f 4322 + nla_total_size(16) /* IFA_ADDRESS */
479840ff
JP		 4323 + nla_total_size(sizeof(struct ifa_cacheinfo))
4324 + nla_total_size(4) /* IFA_FLAGS */;
0ab6803b 4325}
c5396a31 4326
1da177e4 4327static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
15e47304 4328 u32 portid, u32 seq, int event, unsigned int flags)
1da177e4 4329{
1da177e4 4330 struct nlmsghdr *nlh;
85486af0 4331 u32 preferred, valid;
1da177e4 4332
15e47304 4333 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
63159f29 4334 if (!nlh)
26932566 4335 return -EMSGSIZE;
0ab6803b 4336
101bb229
TG		 4337 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
4338 ifa->idev->dev->ifindex);
4339
fad8da3e
YA		 4340 if (!((ifa->flags&IFA_F_PERMANENT) &&
4341 (ifa->prefered_lft == INFINITY_LIFE_TIME))) {
85486af0
TG		 4342 preferred = ifa->prefered_lft;
4343 valid = ifa->valid_lft;
4344 if (preferred != INFINITY_LIFE_TIME) {
1da177e4 4345 long tval = (jiffies - ifa->tstamp)/HZ;
a1faa698
JR		 4346 if (preferred > tval)
4347 preferred -= tval;
4348 else
4349 preferred = 0;
f56619fc
BH		 4350 if (valid != INFINITY_LIFE_TIME) {
4351 if (valid > tval)
4352 valid -= tval;
4353 else
4354 valid = 0;
4355 }
1da177e4
LT		 4356 }
4357 } else {
85486af0
TG		 4358 preferred = INFINITY_LIFE_TIME;
4359 valid = INFINITY_LIFE_TIME;
4360 }
4361
7996c799 4362 if (!ipv6_addr_any(&ifa->peer_addr)) {
930345ea
JB		 4363 if (nla_put_in6_addr(skb, IFA_LOCAL, &ifa->addr) < 0 ||
4364 nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->peer_addr) < 0)
caeaba79
ND		 4365 goto error;
4366 } else
930345ea 4367 if (nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->addr) < 0)
caeaba79
ND		 4368 goto error;
4369
4370 if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0)
4371 goto error;
1da177e4 4372
479840ff
JP		 4373 if (nla_put_u32(skb, IFA_FLAGS, ifa->flags) < 0)
4374 goto error;
4375
053c095a
JB		 4376 nlmsg_end(skb, nlh);
4377 return 0;
caeaba79
ND		 4378
4379error:
4380 nlmsg_cancel(skb, nlh);
4381 return -EMSGSIZE;
1da177e4
LT		 4382}
4383
4384static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
15e47304 4385 u32 portid, u32 seq, int event, u16 flags)
1da177e4 4386{
1da177e4 4387 struct nlmsghdr *nlh;
101bb229
TG		 4388 u8 scope = RT_SCOPE_UNIVERSE;
4389 int ifindex = ifmca->idev->dev->ifindex;
4390
4391 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
4392 scope = RT_SCOPE_SITE;
1da177e4 4393
15e47304 4394 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
63159f29 4395 if (!nlh)
26932566 4396 return -EMSGSIZE;
85486af0 4397
0ab6803b 4398 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
930345ea 4399 if (nla_put_in6_addr(skb, IFA_MULTICAST, &ifmca->mca_addr) < 0 ||
0ab6803b 4400 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
26932566
PM		 4401 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
4402 nlmsg_cancel(skb, nlh);
4403 return -EMSGSIZE;
4404 }
85486af0 4405
053c095a
JB		 4406 nlmsg_end(skb, nlh);
4407 return 0;
1da177e4
LT		 4408}
4409
4410static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
15e47304 4411 u32 portid, u32 seq, int event, unsigned int flags)
1da177e4 4412{
1da177e4 4413 struct nlmsghdr *nlh;
101bb229
TG		 4414 u8 scope = RT_SCOPE_UNIVERSE;
4415 int ifindex = ifaca->aca_idev->dev->ifindex;
4416
4417 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
4418 scope = RT_SCOPE_SITE;
1da177e4 4419
15e47304 4420 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
63159f29 4421 if (!nlh)
26932566 4422 return -EMSGSIZE;
85486af0 4423
0ab6803b 4424 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
930345ea 4425 if (nla_put_in6_addr(skb, IFA_ANYCAST, &ifaca->aca_addr) < 0 ||
0ab6803b 4426 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
26932566
PM		 4427 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
4428 nlmsg_cancel(skb, nlh);
4429 return -EMSGSIZE;
4430 }
1da177e4 4431
053c095a
JB		 4432 nlmsg_end(skb, nlh);
4433 return 0;
1da177e4
LT		 4434}
4435
e21e8467 4436enum addr_type_t {
1da177e4
LT		 4437 UNICAST_ADDR,
4438 MULTICAST_ADDR,
4439 ANYCAST_ADDR,
4440};
4441
234b27c3
ED		 4442/* called with rcu_read_lock() */
4443static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
4444 struct netlink_callback *cb, enum addr_type_t type,
4445 int s_ip_idx, int *p_ip_idx)
4446{
234b27c3
ED		 4447 struct ifmcaddr6 *ifmca;
4448 struct ifacaddr6 *ifaca;
4449 int err = 1;
4450 int ip_idx = *p_ip_idx;
4451
4452 read_lock_bh(&idev->lock);
4453 switch (type) {
502a2ffd 4454 case UNICAST_ADDR: {
4455 struct inet6_ifaddr *ifa;
4456
234b27c3 4457 /* unicast address incl. temp addr */
502a2ffd 4458 list_for_each_entry(ifa, &idev->addr_list, if_list) {
4459 if (++ip_idx < s_ip_idx)
234b27c3
ED		 4460 continue;
4461 err = inet6_fill_ifaddr(skb, ifa,
15e47304 4462 NETLINK_CB(cb->skb).portid,
234b27c3
ED		 4463 cb->nlh->nlmsg_seq,
4464 RTM_NEWADDR,
4465 NLM_F_MULTI);
053c095a 4466 if (err < 0)
234b27c3 4467 break;
63998ac2 4468 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
234b27c3
ED		 4469 }
4470 break;
502a2ffd 4471 }
234b27c3
ED		 4472 case MULTICAST_ADDR:
4473 /* multicast address */
4474 for (ifmca = idev->mc_list; ifmca;
4475 ifmca = ifmca->next, ip_idx++) {
4476 if (ip_idx < s_ip_idx)
4477 continue;
4478 err = inet6_fill_ifmcaddr(skb, ifmca,
15e47304 4479 NETLINK_CB(cb->skb).portid,
234b27c3
ED		 4480 cb->nlh->nlmsg_seq,
4481 RTM_GETMULTICAST,
4482 NLM_F_MULTI);
053c095a 4483 if (err < 0)
234b27c3
ED		 4484 break;
4485 }
4486 break;
4487 case ANYCAST_ADDR:
4488 /* anycast address */
4489 for (ifaca = idev->ac_list; ifaca;
4490 ifaca = ifaca->aca_next, ip_idx++) {
4491 if (ip_idx < s_ip_idx)
4492 continue;
4493 err = inet6_fill_ifacaddr(skb, ifaca,
15e47304 4494 NETLINK_CB(cb->skb).portid,
234b27c3
ED		 4495 cb->nlh->nlmsg_seq,
4496 RTM_GETANYCAST,
4497 NLM_F_MULTI);
053c095a 4498 if (err < 0)
234b27c3
ED		 4499 break;
4500 }
4501 break;
4502 default:
4503 break;
4504 }
4505 read_unlock_bh(&idev->lock);
4506 *p_ip_idx = ip_idx;
4507 return err;
4508}
4509
1da177e4
LT		 4510static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
4511 enum addr_type_t type)
4512{
234b27c3
ED		 4513 struct net *net = sock_net(skb->sk);
4514 int h, s_h;
1da177e4
LT		 4515 int idx, ip_idx;
4516 int s_idx, s_ip_idx;
1da177e4 4517 struct net_device *dev;
234b27c3
ED		 4518 struct inet6_dev *idev;
4519 struct hlist_head *head;
1ab1457c 4520
234b27c3
ED		 4521 s_h = cb->args[0];
4522 s_idx = idx = cb->args[1];
4523 s_ip_idx = ip_idx = cb->args[2];
5d5619b4 4524
234b27c3 4525 rcu_read_lock();
63998ac2 4526 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ net->dev_base_seq;
234b27c3
ED		 4527 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4528 idx = 0;
4529 head = &net->dev_index_head[h];
b67bfe0d 4530 hlist_for_each_entry_rcu(dev, head, index_hlist) {
234b27c3
ED		 4531 if (idx < s_idx)
4532 goto cont;
4b97efdf 4533 if (h > s_h || idx > s_idx)
234b27c3
ED		 4534 s_ip_idx = 0;
4535 ip_idx = 0;
e21e8467
SH		 4536 idev = __in6_dev_get(dev);
4537 if (!idev)
234b27c3
ED		 4538 goto cont;
4539
4540 if (in6_dump_addrs(idev, skb, cb, type,
7b46a644 4541 s_ip_idx, &ip_idx) < 0)
234b27c3 4542 goto done;
7562f876 4543cont:
234b27c3
ED		 4544 idx++;
4545 }
1da177e4 4546 }
234b27c3
ED		 4547done:
4548 rcu_read_unlock();
4549 cb->args[0] = h;
4550 cb->args[1] = idx;
4551 cb->args[2] = ip_idx;
4552
1da177e4
LT		 4553 return skb->len;
4554}
4555
4556static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
4557{
4558 enum addr_type_t type = UNICAST_ADDR;
b854272b 4559
1da177e4
LT		 4560 return inet6_dump_addr(skb, cb, type);
4561}
4562
4563static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
4564{
4565 enum addr_type_t type = MULTICAST_ADDR;
b854272b 4566
1da177e4
LT		 4567 return inet6_dump_addr(skb, cb, type);
4568}
4569
4570
4571static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
4572{
4573 enum addr_type_t type = ANYCAST_ADDR;
b854272b 4574
1da177e4
LT		 4575 return inet6_dump_addr(skb, cb, type);
4576}
4577
661d2967 4578static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh)
6c223828 4579{
3b1e0a65 4580 struct net *net = sock_net(in_skb->sk);
1b29fc2c
TG		 4581 struct ifaddrmsg *ifm;
4582 struct nlattr *tb[IFA_MAX+1];
caeaba79 4583 struct in6_addr *addr = NULL, *peer;
6c223828
NT		 4584 struct net_device *dev = NULL;
4585 struct inet6_ifaddr *ifa;
4586 struct sk_buff *skb;
6c223828
NT		 4587 int err;
4588
1b29fc2c
TG		 4589 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
4590 if (err < 0)
4591 goto errout;
4592
caeaba79 4593 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer);
63159f29 4594 if (!addr) {
1b29fc2c
TG		 4595 err = -EINVAL;
4596 goto errout;
6c223828 4597 }
6c223828 4598
1b29fc2c 4599 ifm = nlmsg_data(nlh);
6c223828 4600 if (ifm->ifa_index)
6fda7350 4601 dev = __dev_get_by_index(net, ifm->ifa_index);
6c223828 4602
e21e8467
SH		 4603 ifa = ipv6_get_ifaddr(net, addr, dev, 1);
4604 if (!ifa) {
1b29fc2c
TG		 4605 err = -EADDRNOTAVAIL;
4606 goto errout;
4607 }
6c223828 4608
e21e8467
SH		 4609 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
4610 if (!skb) {
6c223828 4611 err = -ENOBUFS;
1b29fc2c 4612 goto errout_ifa;
6c223828
NT		 4613 }
4614
15e47304 4615 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).portid,
6c223828 4616 nlh->nlmsg_seq, RTM_NEWADDR, 0);
26932566
PM		 4617 if (err < 0) {
4618 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4619 WARN_ON(err == -EMSGSIZE);
4620 kfree_skb(skb);
4621 goto errout_ifa;
4622 }
15e47304 4623 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
1b29fc2c 4624errout_ifa:
6c223828 4625 in6_ifa_put(ifa);
1b29fc2c 4626errout:
6c223828 4627 return err;
6c223828
NT		 4628}
4629
1da177e4
LT		 4630static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
4631{
4632 struct sk_buff *skb;
c346dca1 4633 struct net *net = dev_net(ifa->idev->dev);
5d620266 4634 int err = -ENOBUFS;
1da177e4 4635
0ab6803b 4636 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
63159f29 4637 if (!skb)
5d620266
TG		 4638 goto errout;
4639
4640 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
26932566
PM		 4641 if (err < 0) {
4642 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4643 WARN_ON(err == -EMSGSIZE);
4644 kfree_skb(skb);
4645 goto errout;
4646 }
1ce85fe4
PNA		 4647 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
4648 return;
5d620266
TG		 4649errout:
4650 if (err < 0)
6fda7350 4651 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
1da177e4
LT		 4652}
4653
b6f99a21 4654static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
1da177e4
LT		 4655 __s32 *array, int bytes)
4656{
04561c1f
TG		 4657 BUG_ON(bytes < (DEVCONF_MAX * 4));
4658
1da177e4
LT		 4659 memset(array, 0, bytes);
4660 array[DEVCONF_FORWARDING] = cnf->forwarding;
4661 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
4662 array[DEVCONF_MTU6] = cnf->mtu6;
4663 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
4664 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
4665 array[DEVCONF_AUTOCONF] = cnf->autoconf;
4666 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
4667 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
93908d19
TG		 4668 array[DEVCONF_RTR_SOLICIT_INTERVAL] =
4669 jiffies_to_msecs(cnf->rtr_solicit_interval);
4670 array[DEVCONF_RTR_SOLICIT_DELAY] =
4671 jiffies_to_msecs(cnf->rtr_solicit_delay);
1da177e4 4672 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
fc4eba58
HFS		 4673 array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] =
4674 jiffies_to_msecs(cnf->mldv1_unsolicited_report_interval);
4675 array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] =
4676 jiffies_to_msecs(cnf->mldv2_unsolicited_report_interval);
1da177e4
LT		 4677 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
4678 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
4679 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
4680 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
4681 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
1da177e4 4682 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
65f5c7c1 4683 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
8013d1d7 4684 array[DEVCONF_ACCEPT_RA_MIN_HOP_LIMIT] = cnf->accept_ra_min_hop_limit;
c4fd30eb 4685 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
930d6ff2
YH		 4686#ifdef CONFIG_IPV6_ROUTER_PREF
4687 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
93908d19
TG		 4688 array[DEVCONF_RTR_PROBE_INTERVAL] =
4689 jiffies_to_msecs(cnf->rtr_probe_interval);
fa03ef38 4690#ifdef CONFIG_IPV6_ROUTE_INFO
09c884d4
YH		 4691 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
4692#endif
930d6ff2 4693#endif
fbea49e1 4694 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
0bcbc926 4695 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
95c385b4
NH		 4696#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4697 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
7fd2561e 4698 array[DEVCONF_USE_OPTIMISTIC] = cnf->use_optimistic;
95c385b4 4699#endif
7bc570c8
YH		 4700#ifdef CONFIG_IPV6_MROUTE
4701 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
4702#endif
778d80be 4703 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
1b34be74 4704 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
c3faca05 4705 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
5cb04436 4706 array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify;
b800c3b9 4707 array[DEVCONF_SUPPRESS_FRAG_NDISC] = cnf->suppress_frag_ndisc;
d9333196 4708 array[DEVCONF_ACCEPT_RA_FROM_LOCAL] = cnf->accept_ra_from_local;
c2943f14 4709 array[DEVCONF_ACCEPT_RA_MTU] = cnf->accept_ra_mtu;
35103d11 4710 array[DEVCONF_IGNORE_ROUTES_WITH_LINKDOWN] = cnf->ignore_routes_with_linkdown;
3d1bec99 4711 /* we omit DEVCONF_STABLE_SECRET for now */
3985e8a3 4712 array[DEVCONF_USE_OIF_ADDRS_ONLY] = cnf->use_oif_addrs_only;
1da177e4
LT		 4713}
4714
b382b191
TG		 4715static inline size_t inet6_ifla6_size(void)
4716{
4717 return nla_total_size(4) /* IFLA_INET6_FLAGS */
4718 + nla_total_size(sizeof(struct ifla_cacheinfo))
4719 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
4720 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
f53adae4
DB		 4721 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
4722 + nla_total_size(sizeof(struct in6_addr)); /* IFLA_INET6_TOKEN */
b382b191
TG		 4723}
4724
339bf98f
TG		 4725static inline size_t inet6_if_nlmsg_size(void)
4726{
4727 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
4728 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
4729 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
4730 + nla_total_size(4) /* IFLA_MTU */
4731 + nla_total_size(4) /* IFLA_LINK */
0344338b 4732 + nla_total_size(1) /* IFLA_OPERSTATE */
b382b191 4733 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */
339bf98f 4734}
c5396a31 4735
be281e55 4736static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib,
7d720c3e 4737 int items, int bytes)
7f7d9a6b
HX		 4738{
4739 int i;
4740 int pad = bytes - sizeof(u64) * items;
4741 BUG_ON(pad < 0);
4742
4743 /* Use put_unaligned() because stats may not be aligned for u64. */
4744 put_unaligned(items, &stats[0]);
4745 for (i = 1; i < items; i++)
be281e55 4746 put_unaligned(atomic_long_read(&mib[i]), &stats[i]);
7f7d9a6b
HX		 4747
4748 memset(&stats[items], 0, pad);
4749}
4750
698365fa 4751static inline void __snmp6_fill_stats64(u64 *stats, void __percpu *mib,
a3a77372 4752 int bytes, size_t syncpoff)
4ce3c183 4753{
a3a77372
R		 4754 int i, c;
4755 u64 buff[IPSTATS_MIB_MAX];
4756 int pad = bytes - sizeof(u64) * IPSTATS_MIB_MAX;
4757
4ce3c183
ED		 4758 BUG_ON(pad < 0);
4759
a3a77372
R		 4760 memset(buff, 0, sizeof(buff));
4761 buff[0] = IPSTATS_MIB_MAX;
4ce3c183 4762
a3a77372
R		 4763 for_each_possible_cpu(c) {
4764 for (i = 1; i < IPSTATS_MIB_MAX; i++)
4765 buff[i] += snmp_get_cpu_field64(mib, c, i, syncpoff);
4766 }
4767
4768 memcpy(stats, buff, IPSTATS_MIB_MAX * sizeof(u64));
4769 memset(&stats[IPSTATS_MIB_MAX], 0, pad);
4ce3c183
ED		 4770}
4771
7f7d9a6b
HX		 4772static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
4773 int bytes)
4774{
e21e8467 4775 switch (attrtype) {
7f7d9a6b 4776 case IFLA_INET6_STATS:
a3a77372
R		 4777 __snmp6_fill_stats64(stats, idev->stats.ipv6, bytes,
4778 offsetof(struct ipstats_mib, syncp));
7f7d9a6b
HX		 4779 break;
4780 case IFLA_INET6_ICMP6STATS:
be281e55 4781 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, ICMP6_MIB_MAX, bytes);
7f7d9a6b
HX		 4782 break;
4783 }
4784}
4785
d5566fd7
SV		 4786static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev,
4787 u32 ext_filter_mask)
b382b191
TG		 4788{
4789 struct nlattr *nla;
4790 struct ifla_cacheinfo ci;
4791
c78679e8
DM		 4792 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags))
4793 goto nla_put_failure;
b382b191 4794 ci.max_reasm_len = IPV6_MAXPLEN;
24912420
DM		 4795 ci.tstamp = cstamp_delta(idev->tstamp);
4796 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time);
1f9248e5 4797 ci.retrans_time = jiffies_to_msecs(NEIGH_VAR(idev->nd_parms, RETRANS_TIME));
c78679e8
DM		 4798 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci))
4799 goto nla_put_failure;
b382b191 4800 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
63159f29 4801 if (!nla)
b382b191
TG		 4802 goto nla_put_failure;
4803 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
4804
4805 /* XXX - MC not implemented */
4806
d5566fd7
SV		 4807 if (ext_filter_mask & RTEXT_FILTER_SKIP_STATS)
4808 return 0;
4809
b382b191 4810 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
63159f29 4811 if (!nla)
b382b191
TG		 4812 goto nla_put_failure;
4813 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
4814
4815 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
63159f29 4816 if (!nla)
b382b191
TG		 4817 goto nla_put_failure;
4818 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
4819
f53adae4 4820 nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr));
63159f29 4821 if (!nla)
f53adae4 4822 goto nla_put_failure;
bc91b0f0
JP		 4823
4824 if (nla_put_u8(skb, IFLA_INET6_ADDR_GEN_MODE, idev->addr_gen_mode))
4825 goto nla_put_failure;
4826
f53adae4
DB		 4827 read_lock_bh(&idev->lock);
4828 memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla));
4829 read_unlock_bh(&idev->lock);
4830
b382b191
TG		 4831 return 0;
4832
4833nla_put_failure:
4834 return -EMSGSIZE;
4835}
4836
b1974ed0
AR		 4837static size_t inet6_get_link_af_size(const struct net_device *dev,
4838 u32 ext_filter_mask)
b382b191
TG		 4839{
4840 if (!__in6_dev_get(dev))
4841 return 0;
4842
4843 return inet6_ifla6_size();
4844}
4845
d5566fd7
SV		 4846static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev,
4847 u32 ext_filter_mask)
b382b191
TG		 4848{
4849 struct inet6_dev *idev = __in6_dev_get(dev);
4850
4851 if (!idev)
4852 return -ENODATA;
4853
d5566fd7 4854 if (inet6_fill_ifla6_attrs(skb, idev, ext_filter_mask) < 0)
b382b191
TG		 4855 return -EMSGSIZE;
4856
4857 return 0;
4858}
4859
f53adae4
DB		 4860static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token)
4861{
f53adae4
DB		 4862 struct inet6_ifaddr *ifp;
4863 struct net_device *dev = idev->dev;
fc403832 4864 bool update_rs = false;
dc848292 4865 struct in6_addr ll_addr;
f53adae4 4866
c15b1cca
HFS		 4867 ASSERT_RTNL();
4868
63159f29 4869 if (!token)
f53adae4
DB		 4870 return -EINVAL;
4871 if (ipv6_addr_any(token))
4872 return -EINVAL;
4873 if (dev->flags & (IFF_LOOPBACK | IFF_NOARP))
4874 return -EINVAL;
f53adae4
DB		 4875 if (!ipv6_accept_ra(idev))
4876 return -EINVAL;
4877 if (idev->cnf.rtr_solicits <= 0)
4878 return -EINVAL;
4879
4880 write_lock_bh(&idev->lock);
4881
4882 BUILD_BUG_ON(sizeof(token->s6_addr) != 16);
4883 memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8);
4884
4885 write_unlock_bh(&idev->lock);
4886
dc848292
HFS		 4887 if (!idev->dead && (idev->if_flags & IF_READY) &&
4888 !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE |
4889 IFA_F_OPTIMISTIC)) {
fc403832
DB		 4890
4891 /* If we're not ready, then normal ifup will take care
4892 * of this. Otherwise, we need to request our rs here.
4893 */
4894 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters);
4895 update_rs = true;
4896 }
f53adae4
DB		 4897
4898 write_lock_bh(&idev->lock);
fc403832 4899
77ecaace 4900 if (update_rs) {
fc403832 4901 idev->if_flags |= IF_RS_SENT;
77ecaace
HFS		 4902 idev->rs_probes = 1;
4903 addrconf_mod_rs_timer(idev, idev->cnf.rtr_solicit_interval);
4904 }
f53adae4
DB		 4905
4906 /* Well, that's kinda nasty ... */
4907 list_for_each_entry(ifp, &idev->addr_list, if_list) {
4908 spin_lock(&ifp->lock);
617fe29d 4909 if (ifp->tokenized) {
f53adae4
DB		 4910 ifp->valid_lft = 0;
4911 ifp->prefered_lft = 0;
4912 }
4913 spin_unlock(&ifp->lock);
4914 }
4915
4916 write_unlock_bh(&idev->lock);
b2ed64a9 4917 inet6_ifinfo_notify(RTM_NEWLINK, idev);
c15b1cca 4918 addrconf_verify_rtnl();
f53adae4
DB		 4919 return 0;
4920}
4921
11b1f828
DB		 4922static const struct nla_policy inet6_af_policy[IFLA_INET6_MAX + 1] = {
4923 [IFLA_INET6_ADDR_GEN_MODE] = { .type = NLA_U8 },
4924 [IFLA_INET6_TOKEN] = { .len = sizeof(struct in6_addr) },
4925};
4926
4927static int inet6_validate_link_af(const struct net_device *dev,
4928 const struct nlattr *nla)
4929{
4930 struct nlattr *tb[IFLA_INET6_MAX + 1];
4931
4932 if (dev && !__in6_dev_get(dev))
4933 return -EAFNOSUPPORT;
4934
4935 return nla_parse_nested(tb, IFLA_INET6_MAX, nla, inet6_af_policy);
4936}
4937
f53adae4
DB		 4938static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla)
4939{
4940 int err = -EINVAL;
4941 struct inet6_dev *idev = __in6_dev_get(dev);
4942 struct nlattr *tb[IFLA_INET6_MAX + 1];
4943
4944 if (!idev)
4945 return -EAFNOSUPPORT;
4946
4947 if (nla_parse_nested(tb, IFLA_INET6_MAX, nla, NULL) < 0)
4948 BUG();
4949
bc91b0f0 4950 if (tb[IFLA_INET6_TOKEN]) {
f53adae4 4951 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN]));
bc91b0f0
JP		 4952 if (err)
4953 return err;
4954 }
4955
4956 if (tb[IFLA_INET6_ADDR_GEN_MODE]) {
4957 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]);
4958
4959 if (mode != IN6_ADDR_GEN_MODE_EUI64 &&
622c81d5 4960 mode != IN6_ADDR_GEN_MODE_NONE &&
cc9da6cc
BM		 4961 mode != IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
4962 mode != IN6_ADDR_GEN_MODE_RANDOM)
622c81d5
HFS		 4963 return -EINVAL;
4964
4965 if (mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
4966 !idev->cnf.stable_secret.initialized &&
4967 !dev_net(dev)->ipv6.devconf_dflt->stable_secret.initialized)
bc91b0f0 4968 return -EINVAL;
622c81d5 4969
bc91b0f0
JP		 4970 idev->addr_gen_mode = mode;
4971 err = 0;
4972 }
f53adae4
DB		 4973
4974 return err;
4975}
4976
1ab1457c 4977static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
15e47304 4978 u32 portid, u32 seq, int event, unsigned int flags)
1da177e4 4979{
04561c1f 4980 struct net_device *dev = idev->dev;
04561c1f
TG		 4981 struct ifinfomsg *hdr;
4982 struct nlmsghdr *nlh;
4983 void *protoinfo;
04561c1f 4984
15e47304 4985 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags);
63159f29 4986 if (!nlh)
26932566 4987 return -EMSGSIZE;
04561c1f
TG		 4988
4989 hdr = nlmsg_data(nlh);
4990 hdr->ifi_family = AF_INET6;
4991 hdr->__ifi_pad = 0;
4992 hdr->ifi_type = dev->type;
4993 hdr->ifi_index = dev->ifindex;
4994 hdr->ifi_flags = dev_get_flags(dev);
4995 hdr->ifi_change = 0;
4996
c78679e8
DM		 4997 if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
4998 (dev->addr_len &&
4999 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
5000 nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
a54acb3a 5001 (dev->ifindex != dev_get_iflink(dev) &&
0344338b
AG		 5002 nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))) ||
5003 nla_put_u8(skb, IFLA_OPERSTATE,
5004 netif_running(dev) ? dev->operstate : IF_OPER_DOWN))
c78679e8 5005 goto nla_put_failure;
04561c1f 5006 protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
63159f29 5007 if (!protoinfo)
04561c1f 5008 goto nla_put_failure;
1da177e4 5009
d5566fd7 5010 if (inet6_fill_ifla6_attrs(skb, idev, 0) < 0)
bf99f1bd 5011 goto nla_put_failure;
1da177e4 5012
04561c1f 5013 nla_nest_end(skb, protoinfo);
053c095a
JB		 5014 nlmsg_end(skb, nlh);
5015 return 0;
1da177e4 5016
04561c1f 5017nla_put_failure:
26932566
PM		 5018 nlmsg_cancel(skb, nlh);
5019 return -EMSGSIZE;
1da177e4
LT		 5020}
5021
5022static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
5023{
3b1e0a65 5024 struct net *net = sock_net(skb->sk);
84d2697d 5025 int h, s_h;
434a8a58 5026 int idx = 0, s_idx;
1da177e4
LT		 5027 struct net_device *dev;
5028 struct inet6_dev *idev;
84d2697d 5029 struct hlist_head *head;
1da177e4 5030
84d2697d
ED		 5031 s_h = cb->args[0];
5032 s_idx = cb->args[1];
5033
5034 rcu_read_lock();
5035 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
5036 idx = 0;
5037 head = &net->dev_index_head[h];
b67bfe0d 5038 hlist_for_each_entry_rcu(dev, head, index_hlist) {
84d2697d
ED		 5039 if (idx < s_idx)
5040 goto cont;
5041 idev = __in6_dev_get(dev);
5042 if (!idev)
5043 goto cont;
5044 if (inet6_fill_ifinfo(skb, idev,
15e47304 5045 NETLINK_CB(cb->skb).portid,
84d2697d 5046 cb->nlh->nlmsg_seq,
053c095a 5047 RTM_NEWLINK, NLM_F_MULTI) < 0)
84d2697d 5048 goto out;
7562f876 5049cont:
84d2697d
ED		 5050 idx++;
5051 }
1da177e4 5052 }
84d2697d
ED		 5053out:
5054 rcu_read_unlock();
5055 cb->args[1] = idx;
5056 cb->args[0] = h;
1da177e4
LT		 5057
5058 return skb->len;
5059}
5060
5061void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
5062{
5063 struct sk_buff *skb;
c346dca1 5064 struct net *net = dev_net(idev->dev);
8d7a76c9 5065 int err = -ENOBUFS;
1ab1457c 5066
339bf98f 5067 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
63159f29 5068 if (!skb)
8d7a76c9
TG		 5069 goto errout;
5070
5071 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
26932566
PM		 5072 if (err < 0) {
5073 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
5074 WARN_ON(err == -EMSGSIZE);
5075 kfree_skb(skb);
5076 goto errout;
5077 }
5f75a104 5078 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC);
1ce85fe4 5079 return;
8d7a76c9
TG		 5080errout:
5081 if (err < 0)
5f75a104 5082 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err);
1da177e4
LT		 5083}
5084
339bf98f
TG		 5085static inline size_t inet6_prefix_nlmsg_size(void)
5086{
5087 return NLMSG_ALIGN(sizeof(struct prefixmsg))
5088 + nla_total_size(sizeof(struct in6_addr))
5089 + nla_total_size(sizeof(struct prefix_cacheinfo));
5090}
c5396a31 5091
1da177e4 5092static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
15e47304 5093 struct prefix_info *pinfo, u32 portid, u32 seq,
6051e2f4 5094 int event, unsigned int flags)
1da177e4 5095{
6051e2f4
TG		 5096 struct prefixmsg *pmsg;
5097 struct nlmsghdr *nlh;
1da177e4
LT		 5098 struct prefix_cacheinfo ci;
5099
15e47304 5100 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags);
63159f29 5101 if (!nlh)
26932566 5102 return -EMSGSIZE;
6051e2f4
TG		 5103
5104 pmsg = nlmsg_data(nlh);
1da177e4 5105 pmsg->prefix_family = AF_INET6;
8a47077a
PM		 5106 pmsg->prefix_pad1 = 0;
5107 pmsg->prefix_pad2 = 0;
1da177e4
LT		 5108 pmsg->prefix_ifindex = idev->dev->ifindex;
5109 pmsg->prefix_len = pinfo->prefix_len;
5110 pmsg->prefix_type = pinfo->type;
8a47077a 5111 pmsg->prefix_pad3 = 0;
1da177e4
LT		 5112 pmsg->prefix_flags = 0;
5113 if (pinfo->onlink)
5114 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
5115 if (pinfo->autoconf)
5116 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
5117
c78679e8
DM		 5118 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix))
5119 goto nla_put_failure;
1da177e4
LT		 5120 ci.preferred_time = ntohl(pinfo->prefered);
5121 ci.valid_time = ntohl(pinfo->valid);
c78679e8
DM		 5122 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci))
5123 goto nla_put_failure;
053c095a
JB		 5124 nlmsg_end(skb, nlh);
5125 return 0;
1da177e4 5126
6051e2f4 5127nla_put_failure:
26932566
PM		 5128 nlmsg_cancel(skb, nlh);
5129 return -EMSGSIZE;
1da177e4
LT		 5130}
5131
1ab1457c 5132static void inet6_prefix_notify(int event, struct inet6_dev *idev,
1da177e4
LT		 5133 struct prefix_info *pinfo)
5134{
5135 struct sk_buff *skb;
c346dca1 5136 struct net *net = dev_net(idev->dev);
8c384bfa 5137 int err = -ENOBUFS;
1da177e4 5138
339bf98f 5139 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
63159f29 5140 if (!skb)
8c384bfa
TG		 5141 goto errout;
5142
5143 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
26932566
PM		 5144 if (err < 0) {
5145 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
5146 WARN_ON(err == -EMSGSIZE);
5147 kfree_skb(skb);
5148 goto errout;
5149 }
1ce85fe4
PNA		 5150 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
5151 return;
8c384bfa
TG		 5152errout:
5153 if (err < 0)
6fda7350 5154 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
1da177e4
LT		 5155}
5156
1da177e4
LT		 5157static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
5158{
63998ac2
ND		 5159 struct net *net = dev_net(ifp->idev->dev);
5160
c15b1cca
HFS		 5161 if (event)
5162 ASSERT_RTNL();
5163
1da177e4
LT		 5164 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
5165
5166 switch (event) {
5167 case RTM_NEWADDR:
95c385b4
NH		 5168 /*
5169 * If the address was optimistic
5170 * we inserted the route at the start of
5171 * our DAD process, so we don't need
5172 * to do it again
5173 */
5174 if (!(ifp->rt->rt6i_node))
5175 ip6_ins_rt(ifp->rt);
1da177e4
LT		 5176 if (ifp->idev->cnf.forwarding)
5177 addrconf_join_anycast(ifp);
7996c799 5178 if (!ipv6_addr_any(&ifp->peer_addr))
caeaba79
ND		 5179 addrconf_prefix_route(&ifp->peer_addr, 128,
5180 ifp->idev->dev, 0, 0);
1da177e4
LT		 5181 break;
5182 case RTM_DELADDR:
5183 if (ifp->idev->cnf.forwarding)
5184 addrconf_leave_anycast(ifp);
5185 addrconf_leave_solict(ifp->idev, &ifp->addr);
7996c799 5186 if (!ipv6_addr_any(&ifp->peer_addr)) {
caeaba79 5187 struct rt6_info *rt;
caeaba79 5188
e7478dfc
ND		 5189 rt = addrconf_get_prefix_route(&ifp->peer_addr, 128,
5190 ifp->idev->dev, 0, 0);
8e3d5be7
MKL		 5191 if (rt)
5192 ip6_del_rt(rt);
caeaba79 5193 }
d8d1f30b 5194 dst_hold(&ifp->rt->dst);
93fa159a 5195
8e3d5be7 5196 ip6_del_rt(ifp->rt);
705f1c86
HFS		 5197
5198 rt_genid_bump_ipv6(net);
1da177e4
LT		 5199 break;
5200 }
63998ac2 5201 atomic_inc(&net->ipv6.dev_addr_genid);
1da177e4
LT		 5202}
5203
5204static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
5205{
8814c4b5 5206 rcu_read_lock_bh();
1da177e4
LT		 5207 if (likely(ifp->idev->dead == 0))
5208 __ipv6_ifa_notify(event, ifp);
8814c4b5 5209 rcu_read_unlock_bh();
1da177e4
LT		 5210}
5211
5212#ifdef CONFIG_SYSCTL
5213
5214static
fe2c6338 5215int addrconf_sysctl_forward(struct ctl_table *ctl, int write,
1da177e4
LT		 5216 void __user *buffer, size_t *lenp, loff_t *ppos)
5217{
5218 int *valp = ctl->data;
5219 int val = *valp;
88af182e 5220 loff_t pos = *ppos;
fe2c6338 5221 struct ctl_table lctl;
1da177e4
LT		 5222 int ret;
5223
013d97e9
FR		 5224 /*
5225 * ctl->data points to idev->cnf.forwarding, we should
5226 * not modify it until we get the rtnl lock.
5227 */
5228 lctl = *ctl;
5229 lctl.data = &val;
5230
5231 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
1da177e4 5232
c8fecf22 5233 if (write)
b325fddb 5234 ret = addrconf_fixup_forwarding(ctl, valp, val);
88af182e
EB		 5235 if (ret)
5236 *ppos = pos;
1ab1457c 5237 return ret;
1da177e4
LT		 5238}
5239
d6df198d
PS		 5240static
5241int addrconf_sysctl_hop_limit(struct ctl_table *ctl, int write,
5242 void __user *buffer, size_t *lenp, loff_t *ppos)
5243{
5244 struct ctl_table lctl;
5245 int min_hl = 1, max_hl = 255;
5246
5247 lctl = *ctl;
5248 lctl.extra1 = &min_hl;
5249 lctl.extra2 = &max_hl;
5250
5251 return proc_dointvec_minmax(&lctl, write, buffer, lenp, ppos);
5252}
5253
77751427
ML		 5254static
5255int addrconf_sysctl_mtu(struct ctl_table *ctl, int write,
5256 void __user *buffer, size_t *lenp, loff_t *ppos)
5257{
5258 struct inet6_dev *idev = ctl->extra1;
5259 int min_mtu = IPV6_MIN_MTU;
5260 struct ctl_table lctl;
5261
5262 lctl = *ctl;
5263 lctl.extra1 = &min_mtu;
5264 lctl.extra2 = idev ? &idev->dev->mtu : NULL;
5265
5266 return proc_dointvec_minmax(&lctl, write, buffer, lenp, ppos);
5267}
5268
56d417b1
BH		 5269static void dev_disable_change(struct inet6_dev *idev)
5270{
75538c2b
CW		 5271 struct netdev_notifier_info info;
5272
56d417b1
BH		 5273 if (!idev || !idev->dev)
5274 return;
5275
75538c2b 5276 netdev_notifier_info_init(&info, idev->dev);
56d417b1 5277 if (idev->cnf.disable_ipv6)
75538c2b 5278 addrconf_notify(NULL, NETDEV_DOWN, &info);
56d417b1 5279 else
75538c2b 5280 addrconf_notify(NULL, NETDEV_UP, &info);
56d417b1
BH		 5281}
5282
5283static void addrconf_disable_change(struct net *net, __s32 newf)
5284{
5285 struct net_device *dev;
5286 struct inet6_dev *idev;
5287
c6d14c84
ED		 5288 rcu_read_lock();
5289 for_each_netdev_rcu(net, dev) {
56d417b1
BH		 5290 idev = __in6_dev_get(dev);
5291 if (idev) {
5292 int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
5293 idev->cnf.disable_ipv6 = newf;
5294 if (changed)
5295 dev_disable_change(idev);
5296 }
56d417b1 5297 }
c6d14c84 5298 rcu_read_unlock();
56d417b1
BH		 5299}
5300
013d97e9 5301static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf)
56d417b1
BH		 5302{
5303 struct net *net;
013d97e9
FR		 5304 int old;
5305
5306 if (!rtnl_trylock())
5307 return restart_syscall();
56d417b1
BH		 5308
5309 net = (struct net *)table->extra2;
013d97e9
FR		 5310 old = *p;
5311 *p = newf;
56d417b1 5312
013d97e9
FR		 5313 if (p == &net->ipv6.devconf_dflt->disable_ipv6) {
5314 rtnl_unlock();
56d417b1 5315 return 0;
88af182e 5316 }
56d417b1
BH		 5317
5318 if (p == &net->ipv6.devconf_all->disable_ipv6) {
56d417b1
BH		 5319 net->ipv6.devconf_dflt->disable_ipv6 = newf;
5320 addrconf_disable_change(net, newf);
013d97e9 5321 } else if ((!newf) ^ (!old))
56d417b1
BH		 5322 dev_disable_change((struct inet6_dev *)table->extra1);
5323
5324 rtnl_unlock();
5325 return 0;
5326}
5327
5328static
fe2c6338 5329int addrconf_sysctl_disable(struct ctl_table *ctl, int write,
56d417b1
BH		 5330 void __user *buffer, size_t *lenp, loff_t *ppos)
5331{
5332 int *valp = ctl->data;
5333 int val = *valp;
88af182e 5334 loff_t pos = *ppos;
fe2c6338 5335 struct ctl_table lctl;
56d417b1
BH		 5336 int ret;
5337
013d97e9
FR		 5338 /*
5339 * ctl->data points to idev->cnf.disable_ipv6, we should
5340 * not modify it until we get the rtnl lock.
5341 */
5342 lctl = *ctl;
5343 lctl.data = &val;
5344
5345 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
56d417b1
BH		 5346
5347 if (write)
5348 ret = addrconf_disable_ipv6(ctl, valp, val);
88af182e
EB		 5349 if (ret)
5350 *ppos = pos;
56d417b1
BH		 5351 return ret;
5352}
5353
c92d5491 5354static
5355int addrconf_sysctl_proxy_ndp(struct ctl_table *ctl, int write,
5356 void __user *buffer, size_t *lenp, loff_t *ppos)
5357{
5358 int *valp = ctl->data;
5359 int ret;
5360 int old, new;
5361
5362 old = *valp;
5363 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
5364 new = *valp;
5365
5366 if (write && old != new) {
5367 struct net *net = ctl->extra2;
5368
5369 if (!rtnl_trylock())
5370 return restart_syscall();
5371
5372 if (valp == &net->ipv6.devconf_dflt->proxy_ndp)
5373 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
5374 NETCONFA_IFINDEX_DEFAULT,
5375 net->ipv6.devconf_dflt);
5376 else if (valp == &net->ipv6.devconf_all->proxy_ndp)
5377 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
5378 NETCONFA_IFINDEX_ALL,
5379 net->ipv6.devconf_all);
5380 else {
5381 struct inet6_dev *idev = ctl->extra1;
5382
5383 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
5384 idev->dev->ifindex,
5385 &idev->cnf);
5386 }
5387 rtnl_unlock();
5388 }
5389
5390 return ret;
5391}
5392
3d1bec99
HFS		 5393static int addrconf_sysctl_stable_secret(struct ctl_table *ctl, int write,
5394 void __user *buffer, size_t *lenp,
5395 loff_t *ppos)
5396{
5397 int err;
5398 struct in6_addr addr;
5399 char str[IPV6_MAX_STRLEN];
5400 struct ctl_table lctl = *ctl;
622c81d5 5401 struct net *net = ctl->extra2;
3d1bec99
HFS		 5402 struct ipv6_stable_secret *secret = ctl->data;
5403
622c81d5
HFS		 5404 if (&net->ipv6.devconf_all->stable_secret == ctl->data)
5405 return -EIO;
5406
3d1bec99
HFS		 5407 lctl.maxlen = IPV6_MAX_STRLEN;
5408 lctl.data = str;
5409
5410 if (!rtnl_trylock())
5411 return restart_syscall();
5412
5413 if (!write && !secret->initialized) {
5414 err = -EIO;
5415 goto out;
5416 }
5417
5449a5ca
WC		 5418 err = snprintf(str, sizeof(str), "%pI6", &secret->secret);
5419 if (err >= sizeof(str)) {
5420 err = -EIO;
5421 goto out;
3d1bec99
HFS		 5422 }
5423
5424 err = proc_dostring(&lctl, write, buffer, lenp, ppos);
5425 if (err || !write)
5426 goto out;
5427
5428 if (in6_pton(str, -1, addr.in6_u.u6_addr8, -1, NULL) != 1) {
5429 err = -EIO;
5430 goto out;
5431 }
5432
5433 secret->initialized = true;
5434 secret->secret = addr;
5435
622c81d5
HFS		 5436 if (&net->ipv6.devconf_dflt->stable_secret == ctl->data) {
5437 struct net_device *dev;
5438
5439 for_each_netdev(net, dev) {
5440 struct inet6_dev *idev = __in6_dev_get(dev);
5441
5442 if (idev) {
5443 idev->addr_gen_mode =
5444 IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
5445 }
5446 }
5447 } else {
5448 struct inet6_dev *idev = ctl->extra1;
5449
5450 idev->addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
5451 }
5452
3d1bec99
HFS		 5453out:
5454 rtnl_unlock();
5455
5456 return err;
5457}
c92d5491 5458
35103d11
AG		 5459static
5460int addrconf_sysctl_ignore_routes_with_linkdown(struct ctl_table *ctl,
5461 int write,
5462 void __user *buffer,
5463 size_t *lenp,
5464 loff_t *ppos)
5465{
5466 int *valp = ctl->data;
5467 int val = *valp;
5468 loff_t pos = *ppos;
5469 struct ctl_table lctl;
5470 int ret;
5471
5472 /* ctl->data points to idev->cnf.ignore_routes_when_linkdown
5473 * we should not modify it until we get the rtnl lock.
5474 */
5475 lctl = *ctl;
5476 lctl.data = &val;
5477
5478 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
5479
5480 if (write)
5481 ret = addrconf_fixup_linkdown(ctl, valp, val);
5482 if (ret)
5483 *ppos = pos;
5484 return ret;
5485}
5486
1da177e4
LT		 5487static struct addrconf_sysctl_table
5488{
5489 struct ctl_table_header *sysctl_header;
fe2c6338 5490 struct ctl_table addrconf_vars[DEVCONF_MAX+1];
ab32ea5d 5491} addrconf_sysctl __read_mostly = {
1da177e4
LT		 5492 .sysctl_header = NULL,
5493 .addrconf_vars = {
1ab1457c 5494 {
e21e8467
SH		 5495 .procname = "forwarding",
5496 .data = &ipv6_devconf.forwarding,
5497 .maxlen = sizeof(int),
5498 .mode = 0644,
5499 .proc_handler = addrconf_sysctl_forward,
1da177e4
LT		 5500 },
5501 {
e21e8467
SH		 5502 .procname = "hop_limit",
5503 .data = &ipv6_devconf.hop_limit,
5504 .maxlen = sizeof(int),
5505 .mode = 0644,
d6df198d 5506 .proc_handler = addrconf_sysctl_hop_limit,
1da177e4
LT		 5507 },
5508 {
e21e8467
SH		 5509 .procname = "mtu",
5510 .data = &ipv6_devconf.mtu6,
5511 .maxlen = sizeof(int),
5512 .mode = 0644,
77751427 5513 .proc_handler = addrconf_sysctl_mtu,
1da177e4
LT		 5514 },
5515 {
e21e8467
SH		 5516 .procname = "accept_ra",
5517 .data = &ipv6_devconf.accept_ra,
5518 .maxlen = sizeof(int),
5519 .mode = 0644,
5520 .proc_handler = proc_dointvec,
1da177e4
LT		 5521 },
5522 {
e21e8467
SH		 5523 .procname = "accept_redirects",
5524 .data = &ipv6_devconf.accept_redirects,
5525 .maxlen = sizeof(int),
5526 .mode = 0644,
5527 .proc_handler = proc_dointvec,
1da177e4
LT		 5528 },
5529 {
e21e8467
SH		 5530 .procname = "autoconf",
5531 .data = &ipv6_devconf.autoconf,
5532 .maxlen = sizeof(int),
5533 .mode = 0644,
5534 .proc_handler = proc_dointvec,
1da177e4
LT		 5535 },
5536 {
e21e8467
SH		 5537 .procname = "dad_transmits",
5538 .data = &ipv6_devconf.dad_transmits,
5539 .maxlen = sizeof(int),
5540 .mode = 0644,
5541 .proc_handler = proc_dointvec,
1da177e4
LT		 5542 },
5543 {
e21e8467
SH		 5544 .procname = "router_solicitations",
5545 .data = &ipv6_devconf.rtr_solicits,
5546 .maxlen = sizeof(int),
5547 .mode = 0644,
5548 .proc_handler = proc_dointvec,
1da177e4
LT		 5549 },
5550 {
e21e8467
SH		 5551 .procname = "router_solicitation_interval",
5552 .data = &ipv6_devconf.rtr_solicit_interval,
5553 .maxlen = sizeof(int),
5554 .mode = 0644,
5555 .proc_handler = proc_dointvec_jiffies,
1da177e4
LT		 5556 },
5557 {
e21e8467
SH		 5558 .procname = "router_solicitation_delay",
5559 .data = &ipv6_devconf.rtr_solicit_delay,
5560 .maxlen = sizeof(int),
5561 .mode = 0644,
5562 .proc_handler = proc_dointvec_jiffies,
1da177e4
LT		 5563 },
5564 {
e21e8467
SH		 5565 .procname = "force_mld_version",
5566 .data = &ipv6_devconf.force_mld_version,
5567 .maxlen = sizeof(int),
5568 .mode = 0644,
5569 .proc_handler = proc_dointvec,
1da177e4 5570 },
fc4eba58
HFS		 5571 {
5572 .procname = "mldv1_unsolicited_report_interval",
5573 .data =
5574 &ipv6_devconf.mldv1_unsolicited_report_interval,
5575 .maxlen = sizeof(int),
5576 .mode = 0644,
5577 .proc_handler = proc_dointvec_ms_jiffies,
5578 },
5579 {
5580 .procname = "mldv2_unsolicited_report_interval",
5581 .data =
5582 &ipv6_devconf.mldv2_unsolicited_report_interval,
5583 .maxlen = sizeof(int),
5584 .mode = 0644,
5585 .proc_handler = proc_dointvec_ms_jiffies,
5586 },
1da177e4 5587 {
e21e8467
SH		 5588 .procname = "use_tempaddr",
5589 .data = &ipv6_devconf.use_tempaddr,
5590 .maxlen = sizeof(int),
5591 .mode = 0644,
5592 .proc_handler = proc_dointvec,
1da177e4
LT		 5593 },
5594 {
e21e8467
SH		 5595 .procname = "temp_valid_lft",
5596 .data = &ipv6_devconf.temp_valid_lft,
5597 .maxlen = sizeof(int),
5598 .mode = 0644,
5599 .proc_handler = proc_dointvec,
1da177e4
LT		 5600 },
5601 {
e21e8467
SH		 5602 .procname = "temp_prefered_lft",
5603 .data = &ipv6_devconf.temp_prefered_lft,
5604 .maxlen = sizeof(int),
5605 .mode = 0644,
5606 .proc_handler = proc_dointvec,
1da177e4
LT		 5607 },
5608 {
e21e8467
SH		 5609 .procname = "regen_max_retry",
5610 .data = &ipv6_devconf.regen_max_retry,
5611 .maxlen = sizeof(int),
5612 .mode = 0644,
5613 .proc_handler = proc_dointvec,
1da177e4
LT		 5614 },
5615 {
e21e8467
SH		 5616 .procname = "max_desync_factor",
5617 .data = &ipv6_devconf.max_desync_factor,
5618 .maxlen = sizeof(int),
5619 .mode = 0644,
5620 .proc_handler = proc_dointvec,
1da177e4 5621 },
1da177e4 5622 {
e21e8467
SH		 5623 .procname = "max_addresses",
5624 .data = &ipv6_devconf.max_addresses,
5625 .maxlen = sizeof(int),
5626 .mode = 0644,
5627 .proc_handler = proc_dointvec,
1da177e4 5628 },
65f5c7c1 5629 {
e21e8467
SH		 5630 .procname = "accept_ra_defrtr",
5631 .data = &ipv6_devconf.accept_ra_defrtr,
5632 .maxlen = sizeof(int),
5633 .mode = 0644,
5634 .proc_handler = proc_dointvec,
65f5c7c1 5635 },
8013d1d7
HL		 5636 {
5637 .procname = "accept_ra_min_hop_limit",
5638 .data = &ipv6_devconf.accept_ra_min_hop_limit,
5639 .maxlen = sizeof(int),
5640 .mode = 0644,
5641 .proc_handler = proc_dointvec,
5642 },
c4fd30eb 5643 {
e21e8467
SH		 5644 .procname = "accept_ra_pinfo",
5645 .data = &ipv6_devconf.accept_ra_pinfo,
5646 .maxlen = sizeof(int),
5647 .mode = 0644,
5648 .proc_handler = proc_dointvec,
c4fd30eb 5649 },
930d6ff2
YH		 5650#ifdef CONFIG_IPV6_ROUTER_PREF
5651 {
e21e8467
SH		 5652 .procname = "accept_ra_rtr_pref",
5653 .data = &ipv6_devconf.accept_ra_rtr_pref,
5654 .maxlen = sizeof(int),
5655 .mode = 0644,
5656 .proc_handler = proc_dointvec,
930d6ff2 5657 },
52e16356 5658 {
e21e8467
SH		 5659 .procname = "router_probe_interval",
5660 .data = &ipv6_devconf.rtr_probe_interval,
5661 .maxlen = sizeof(int),
5662 .mode = 0644,
5663 .proc_handler = proc_dointvec_jiffies,
52e16356 5664 },
fa03ef38 5665#ifdef CONFIG_IPV6_ROUTE_INFO
09c884d4 5666 {
e21e8467
SH		 5667 .procname = "accept_ra_rt_info_max_plen",
5668 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
5669 .maxlen = sizeof(int),
5670 .mode = 0644,
5671 .proc_handler = proc_dointvec,
09c884d4
YH		 5672 },
5673#endif
930d6ff2 5674#endif
fbea49e1 5675 {
e21e8467
SH		 5676 .procname = "proxy_ndp",
5677 .data = &ipv6_devconf.proxy_ndp,
5678 .maxlen = sizeof(int),
5679 .mode = 0644,
c92d5491 5680 .proc_handler = addrconf_sysctl_proxy_ndp,
fbea49e1 5681 },
0bcbc926 5682 {
e21e8467
SH		 5683 .procname = "accept_source_route",
5684 .data = &ipv6_devconf.accept_source_route,
5685 .maxlen = sizeof(int),
5686 .mode = 0644,
5687 .proc_handler = proc_dointvec,
0bcbc926 5688 },
95c385b4
NH		 5689#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
5690 {
e21e8467
SH		 5691 .procname = "optimistic_dad",
5692 .data = &ipv6_devconf.optimistic_dad,
5693 .maxlen = sizeof(int),
5694 .mode = 0644,
5695 .proc_handler = proc_dointvec,
95c385b4
NH		 5696
5697 },
7fd2561e
EK		 5698 {
5699 .procname = "use_optimistic",
5700 .data = &ipv6_devconf.use_optimistic,
5701 .maxlen = sizeof(int),
5702 .mode = 0644,
5703 .proc_handler = proc_dointvec,
5704
5705 },
7bc570c8
YH		 5706#endif
5707#ifdef CONFIG_IPV6_MROUTE
5708 {
e21e8467
SH		 5709 .procname = "mc_forwarding",
5710 .data = &ipv6_devconf.mc_forwarding,
5711 .maxlen = sizeof(int),
5712 .mode = 0444,
5713 .proc_handler = proc_dointvec,
7bc570c8 5714 },
95c385b4 5715#endif
778d80be 5716 {
e21e8467
SH		 5717 .procname = "disable_ipv6",
5718 .data = &ipv6_devconf.disable_ipv6,
5719 .maxlen = sizeof(int),
5720 .mode = 0644,
5721 .proc_handler = addrconf_sysctl_disable,
778d80be 5722 },
1b34be74 5723 {
e21e8467
SH		 5724 .procname = "accept_dad",
5725 .data = &ipv6_devconf.accept_dad,
5726 .maxlen = sizeof(int),
5727 .mode = 0644,
5728 .proc_handler = proc_dointvec,
1b34be74 5729 },
f7734fdf 5730 {
f7734fdf
OP		 5731 .procname = "force_tllao",
5732 .data = &ipv6_devconf.force_tllao,
5733 .maxlen = sizeof(int),
5734 .mode = 0644,
5735 .proc_handler = proc_dointvec
5736 },
5cb04436
HFS		 5737 {
5738 .procname = "ndisc_notify",
5739 .data = &ipv6_devconf.ndisc_notify,
5740 .maxlen = sizeof(int),
5741 .mode = 0644,
5742 .proc_handler = proc_dointvec
5743 },
b800c3b9
HFS		 5744 {
5745 .procname = "suppress_frag_ndisc",
5746 .data = &ipv6_devconf.suppress_frag_ndisc,
5747 .maxlen = sizeof(int),
5748 .mode = 0644,
5749 .proc_handler = proc_dointvec
5750 },
d9333196
BG		 5751 {
5752 .procname = "accept_ra_from_local",
5753 .data = &ipv6_devconf.accept_ra_from_local,
5754 .maxlen = sizeof(int),
5755 .mode = 0644,
5756 .proc_handler = proc_dointvec,
5757 },
c2943f14
HH		 5758 {
5759 .procname = "accept_ra_mtu",
5760 .data = &ipv6_devconf.accept_ra_mtu,
5761 .maxlen = sizeof(int),
5762 .mode = 0644,
5763 .proc_handler = proc_dointvec,
5764 },
3d1bec99
HFS		 5765 {
5766 .procname = "stable_secret",
5767 .data = &ipv6_devconf.stable_secret,
5768 .maxlen = IPV6_MAX_STRLEN,
5769 .mode = 0600,
5770 .proc_handler = addrconf_sysctl_stable_secret,
5771 },
3985e8a3
EK		 5772 {
5773 .procname = "use_oif_addrs_only",
5774 .data = &ipv6_devconf.use_oif_addrs_only,
5775 .maxlen = sizeof(int),
5776 .mode = 0644,
5777 .proc_handler = proc_dointvec,
35103d11
AG		 5778 },
5779 {
5780 .procname = "ignore_routes_with_linkdown",
5781 .data = &ipv6_devconf.ignore_routes_with_linkdown,
5782 .maxlen = sizeof(int),
5783 .mode = 0644,
5784 .proc_handler = addrconf_sysctl_ignore_routes_with_linkdown,
3985e8a3 5785 },
1da177e4 5786 {
f8572d8f 5787 /* sentinel */
1da177e4
LT		 5788 }
5789 },
1da177e4
LT		 5790};
5791
bff16c2f 5792static int __addrconf_sysctl_register(struct net *net, char *dev_name,
f8572d8f 5793 struct inet6_dev *idev, struct ipv6_devconf *p)
1da177e4
LT		 5794{
5795 int i;
1da177e4 5796 struct addrconf_sysctl_table *t;
6105e293 5797 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ];
1dab6222 5798
af879cc7 5799 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
63159f29 5800 if (!t)
f68635e6
PE		 5801 goto out;
5802
bcdd553f 5803 for (i = 0; t->addrconf_vars[i].data; i++) {
e21e8467 5804 t->addrconf_vars[i].data += (char *)p - (char *)&ipv6_devconf;
1da177e4 5805 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
bff16c2f 5806 t->addrconf_vars[i].extra2 = net;
1da177e4 5807 }
1da177e4 5808
6105e293 5809 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name);
1da177e4 5810
6105e293 5811 t->sysctl_header = register_net_sysctl(net, path, t->addrconf_vars);
63159f29 5812 if (!t->sysctl_header)
6105e293 5813 goto free;
f68635e6
PE		 5814
5815 p->sysctl = t;
95897312 5816 return 0;
1da177e4 5817
f68635e6 5818free:
1da177e4 5819 kfree(t);
f68635e6 5820out:
95897312 5821 return -ENOBUFS;
1da177e4
LT		 5822}
5823
408c4768
PE		 5824static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
5825{
5826 struct addrconf_sysctl_table *t;
5827
63159f29 5828 if (!p->sysctl)
408c4768
PE		 5829 return;
5830
5831 t = p->sysctl;
5832 p->sysctl = NULL;
ff538818 5833 unregister_net_sysctl_table(t->sysctl_header);
408c4768
PE		 5834 kfree(t);
5835}
5836
a317a2f1 5837static int addrconf_sysctl_register(struct inet6_dev *idev)
f52295a9 5838{
a317a2f1
WC		 5839 int err;
5840
5841 if (!sysctl_dev_name_is_allowed(idev->dev->name))
5842 return -EINVAL;
5843
5844 err = neigh_sysctl_register(idev->dev, idev->nd_parms,
5845 &ndisc_ifinfo_sysctl_change);
5846 if (err)
5847 return err;
5848 err = __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
5849 idev, &idev->cnf);
5850 if (err)
5851 neigh_sysctl_unregister(idev->nd_parms);
5852
5853 return err;
f52295a9
PE		 5854}
5855
408c4768 5856static void addrconf_sysctl_unregister(struct inet6_dev *idev)
1da177e4 5857{
408c4768
PE		 5858 __addrconf_sysctl_unregister(&idev->cnf);
5859 neigh_sysctl_unregister(idev->nd_parms);
1da177e4
LT		 5860}
5861
5862
5863#endif
5864
2c8c1e72 5865static int __net_init addrconf_init_net(struct net *net)
e0da5a48 5866{
a79ca223 5867 int err = -ENOMEM;
e0da5a48
PE		 5868 struct ipv6_devconf *all, *dflt;
5869
a79ca223 5870 all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL);
63159f29 5871 if (!all)
a79ca223 5872 goto err_alloc_all;
e0da5a48 5873
a79ca223 5874 dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
63159f29 5875 if (!dflt)
a79ca223 5876 goto err_alloc_dflt;
e0da5a48 5877
a79ca223
HZ		 5878 /* these will be inherited by all namespaces */
5879 dflt->autoconf = ipv6_defaults.autoconf;
5880 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
e0da5a48 5881
3d1bec99
HFS		 5882 dflt->stable_secret.initialized = false;
5883 all->stable_secret.initialized = false;
5884
e0da5a48
PE		 5885 net->ipv6.devconf_all = all;
5886 net->ipv6.devconf_dflt = dflt;
5887
5888#ifdef CONFIG_SYSCTL
f8572d8f 5889 err = __addrconf_sysctl_register(net, "all", NULL, all);
e0da5a48
PE		 5890 if (err < 0)
5891 goto err_reg_all;
5892
f8572d8f 5893 err = __addrconf_sysctl_register(net, "default", NULL, dflt);
e0da5a48
PE		 5894 if (err < 0)
5895 goto err_reg_dflt;
5896#endif
5897 return 0;
5898
5899#ifdef CONFIG_SYSCTL
5900err_reg_dflt:
5901 __addrconf_sysctl_unregister(all);
5902err_reg_all:
5903 kfree(dflt);
5904#endif
5905err_alloc_dflt:
5906 kfree(all);
5907err_alloc_all:
5908 return err;
5909}
5910
2c8c1e72 5911static void __net_exit addrconf_exit_net(struct net *net)
e0da5a48
PE		 5912{
5913#ifdef CONFIG_SYSCTL
5914 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
5915 __addrconf_sysctl_unregister(net->ipv6.devconf_all);
5916#endif
73cf0e92 5917 kfree(net->ipv6.devconf_dflt);
5918 kfree(net->ipv6.devconf_all);
e0da5a48
PE		 5919}
5920
5921static struct pernet_operations addrconf_ops = {
5922 .init = addrconf_init_net,
5923 .exit = addrconf_exit_net,
5924};
5925
207895fd 5926static struct rtnl_af_ops inet6_ops __read_mostly = {
b382b191
TG		 5927 .family = AF_INET6,
5928 .fill_link_af = inet6_fill_link_af,
5929 .get_link_af_size = inet6_get_link_af_size,
11b1f828 5930 .validate_link_af = inet6_validate_link_af,
f53adae4 5931 .set_link_af = inet6_set_link_af,
b382b191
TG		 5932};
5933
1da177e4
LT		 5934/*
5935 * Init / cleanup code
5936 */
5937
5938int __init addrconf_init(void)
5939{
a317a2f1 5940 struct inet6_dev *idev;
c2e21293 5941 int i, err;
2a8cc6c8 5942
e21e8467
SH		 5943 err = ipv6_addr_label_init();
5944 if (err < 0) {
f3213831
JP		 5945 pr_crit("%s: cannot initialize default policy table: %d\n",
5946 __func__, err);
2cc6d2bf 5947 goto out;
2a8cc6c8 5948 }
1da177e4 5949
2cc6d2bf
NH		 5950 err = register_pernet_subsys(&addrconf_ops);
5951 if (err < 0)
5952 goto out_addrlabel;
e0da5a48 5953
c15b1cca
HFS		 5954 addrconf_wq = create_workqueue("ipv6_addrconf");
5955 if (!addrconf_wq) {
5956 err = -ENOMEM;
5957 goto out_nowq;
5958 }
5959
1da177e4
LT		 5960 /* The addrconf netdev notifier requires that loopback_dev
5961 * has it's ipv6 private information allocated and setup
5962 * before it can bring up and give link-local addresses
5963 * to other devices which are up.
5964 *
5965 * Unfortunately, loopback_dev is not necessarily the first
5966 * entry in the global dev_base list of net devices. In fact,
5967 * it is likely to be the very last entry on that list.
5968 * So this causes the notifier registry below to try and
5969 * give link-local addresses to all devices besides loopback_dev
5970 * first, then loopback_dev, which cases all the non-loopback_dev
5971 * devices to fail to get a link-local address.
5972 *
5973 * So, as a temporary fix, allocate the ipv6 structure for
5974 * loopback_dev first by hand.
5975 * Longer term, all of the dependencies ipv6 has upon the loopback
5976 * device and it being up should be removed.
5977 */
5978 rtnl_lock();
a317a2f1 5979 idev = ipv6_add_dev(init_net.loopback_dev);
1da177e4 5980 rtnl_unlock();
a317a2f1
WC		 5981 if (IS_ERR(idev)) {
5982 err = PTR_ERR(idev);
e0da5a48 5983 goto errlo;
a317a2f1 5984 }
1da177e4 5985
c2e21293 5986 for (i = 0; i < IN6_ADDR_HSIZE; i++)
5987 INIT_HLIST_HEAD(&inet6_addr_lst[i]);
5988
1da177e4
LT		 5989 register_netdevice_notifier(&ipv6_dev_notf);
5990
c15b1cca 5991 addrconf_verify();
c127ea2c 5992
3678a9d8 5993 rtnl_af_register(&inet6_ops);
b382b191 5994
c7ac8679
GR		 5995 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo,
5996 NULL);
c127ea2c
TG		 5997 if (err < 0)
5998 goto errout;
5999
6000 /* Only the first call to __rtnl_register can fail */
c7ac8679
GR		 6001 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL, NULL);
6002 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL, NULL);
6003 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr,
6004 inet6_dump_ifaddr, NULL);
6005 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL,
6006 inet6_dump_ifmcaddr, NULL);
6007 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL,
6008 inet6_dump_ifacaddr, NULL);
76f8f6cb 6009 __rtnl_register(PF_INET6, RTM_GETNETCONF, inet6_netconf_get_devconf,
7a674200 6010 inet6_netconf_dump_devconf, NULL);
c127ea2c 6011
2a8cc6c8
YH		 6012 ipv6_addr_label_rtnl_register();
6013
1da177e4 6014 return 0;
c127ea2c 6015errout:
b382b191 6016 rtnl_af_unregister(&inet6_ops);
c127ea2c 6017 unregister_netdevice_notifier(&ipv6_dev_notf);
e0da5a48 6018errlo:
c15b1cca
HFS		 6019 destroy_workqueue(addrconf_wq);
6020out_nowq:
e0da5a48 6021 unregister_pernet_subsys(&addrconf_ops);
2cc6d2bf
NH		 6022out_addrlabel:
6023 ipv6_addr_label_cleanup();
6024out:
c127ea2c 6025 return err;
1da177e4
LT		 6026}
6027
09f7709f 6028void addrconf_cleanup(void)
1da177e4 6029{
176c39af 6030 struct net_device *dev;
1da177e4
LT		 6031 int i;
6032
6033 unregister_netdevice_notifier(&ipv6_dev_notf);
e0da5a48 6034 unregister_pernet_subsys(&addrconf_ops);
2cc6d2bf 6035 ipv6_addr_label_cleanup();
1da177e4
LT		 6036
6037 rtnl_lock();
6038
b382b191
TG		 6039 __rtnl_af_unregister(&inet6_ops);
6040
176c39af
DL		 6041 /* clean dev list */
6042 for_each_netdev(&init_net, dev) {
6043 if (__in6_dev_get(dev) == NULL)
6044 continue;
6045 addrconf_ifdown(dev, 1);
6046 }
6047 addrconf_ifdown(init_net.loopback_dev, 2);
6048
1da177e4
LT		 6049 /*
6050 * Check hash table.
6051 */
5c578aed 6052 spin_lock_bh(&addrconf_hash_lock);
c2e21293 6053 for (i = 0; i < IN6_ADDR_HSIZE; i++)
6054 WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
5c578aed 6055 spin_unlock_bh(&addrconf_hash_lock);
c15b1cca 6056 cancel_delayed_work(&addr_chk_work);
1da177e4 6057 rtnl_unlock();
c15b1cca
HFS		 6058
6059 destroy_workqueue(addrconf_wq);
1da177e4 6060}
Linux kernel - Deliverables
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