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net: sxgbe: fix error handling in init_rx_ring()
[linux-block.git] / net / ipv6 / addrconf.c
CommitLineData
1da177e4
LT		 1/*
2 * IPv6 Address [auto]configuration
3 * Linux INET6 implementation
4 *
5 * Authors:
1ab1457c 6 * Pedro Roque <roque@di.fc.ul.pt>
1da177e4
LT		 7 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
8 *
1da177e4
LT		 9 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License
11 * as published by the Free Software Foundation; either version
12 * 2 of the License, or (at your option) any later version.
13 */
14
15/*
16 * Changes:
17 *
18 * Janos Farkas : delete timer on ifdown
19 * <chexum@bankinf.banki.hu>
20 * Andi Kleen : kill double kfree on module
21 * unload.
22 * Maciej W. Rozycki : FDDI support
23 * sekiya@USAGI : Don't send too many RS
24 * packets.
25 * yoshfuji@USAGI : Fixed interval between DAD
26 * packets.
27 * YOSHIFUJI Hideaki @USAGI : improved accuracy of
28 * address validation timer.
29 * YOSHIFUJI Hideaki @USAGI : Privacy Extensions (RFC3041)
30 * support.
31 * Yuji SEKIYA @USAGI : Don't assign a same IPv6
32 * address on a same interface.
33 * YOSHIFUJI Hideaki @USAGI : ARCnet support
34 * YOSHIFUJI Hideaki @USAGI : convert /proc/net/if_inet6 to
35 * seq_file.
b1cacb68
YH		 36 * YOSHIFUJI Hideaki @USAGI : improved source address
37 * selection; consider scope,
38 * status etc.
1da177e4
LT		 39 */
40
f3213831
JP		 41#define pr_fmt(fmt) "IPv6: " fmt
42
1da177e4
LT		 43#include <linux/errno.h>
44#include <linux/types.h>
a0bffffc 45#include <linux/kernel.h>
1da177e4
LT		 46#include <linux/socket.h>
47#include <linux/sockios.h>
1da177e4
LT		 48#include <linux/net.h>
49#include <linux/in6.h>
50#include <linux/netdevice.h>
1823730f 51#include <linux/if_addr.h>
1da177e4
LT		 52#include <linux/if_arp.h>
53#include <linux/if_arcnet.h>
54#include <linux/if_infiniband.h>
55#include <linux/route.h>
56#include <linux/inetdevice.h>
57#include <linux/init.h>
5a0e3ad6 58#include <linux/slab.h>
1da177e4
LT		 59#ifdef CONFIG_SYSCTL
60#include <linux/sysctl.h>
61#endif
4fc268d2 62#include <linux/capability.h>
1da177e4
LT		 63#include <linux/delay.h>
64#include <linux/notifier.h>
543537bd 65#include <linux/string.h>
ddbe5032 66#include <linux/hash.h>
1da177e4 67
457c4cbc 68#include <net/net_namespace.h>
1da177e4
LT		 69#include <net/sock.h>
70#include <net/snmp.h>
71
06a4c1c5 72#include <net/af_ieee802154.h>
cb6bf355 73#include <net/firewire.h>
1da177e4
LT		 74#include <net/ipv6.h>
75#include <net/protocol.h>
76#include <net/ndisc.h>
77#include <net/ip6_route.h>
78#include <net/addrconf.h>
79#include <net/tcp.h>
80#include <net/ip.h>
5d620266 81#include <net/netlink.h>
f24e3d65 82#include <net/pkt_sched.h>
1da177e4
LT		 83#include <linux/if_tunnel.h>
84#include <linux/rtnetlink.h>
f3a1bfb1 85#include <linux/netconf.h>
1da177e4 86#include <linux/random.h>
e21e8467 87#include <linux/uaccess.h>
7f7d9a6b 88#include <asm/unaligned.h>
1da177e4
LT		 89
90#include <linux/proc_fs.h>
91#include <linux/seq_file.h>
bc3b2d7f 92#include <linux/export.h>
1da177e4
LT		 93
94/* Set to 3 to get tracing... */
95#define ACONF_DEBUG 2
96
97#if ACONF_DEBUG >= 3
ba3542e1 98#define ADBG(fmt, ...) printk(fmt, ##__VA_ARGS__)
1da177e4 99#else
ba3542e1 100#define ADBG(fmt, ...) do { if (0) printk(fmt, ##__VA_ARGS__); } while (0)
1da177e4
LT		 101#endif
102
103#define INFINITY_LIFE_TIME 0xFFFFFFFF
18a31e1e
TG		 104
105static inline u32 cstamp_delta(unsigned long cstamp)
106{
107 return (cstamp - INITIAL_JIFFIES) * 100UL / HZ;
108}
1da177e4
LT		 109
110#ifdef CONFIG_SYSCTL
a317a2f1 111static int addrconf_sysctl_register(struct inet6_dev *idev);
408c4768
PE		 112static void addrconf_sysctl_unregister(struct inet6_dev *idev);
113#else
a317a2f1 114static inline int addrconf_sysctl_register(struct inet6_dev *idev)
408c4768 115{
a317a2f1 116 return 0;
408c4768
PE		 117}
118
119static inline void addrconf_sysctl_unregister(struct inet6_dev *idev)
120{
121}
1da177e4
LT		 122#endif
123
eb7e0575
SD		 124static void __ipv6_regen_rndid(struct inet6_dev *idev);
125static void __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
1da177e4 126static void ipv6_regen_rndid(unsigned long data);
1da177e4 127
1b34be74 128static int ipv6_generate_eui64(u8 *eui, struct net_device *dev);
1da177e4
LT		 129static int ipv6_count_addresses(struct inet6_dev *idev);
130
131/*
132 * Configured unicast address hash table
133 */
c2e21293 134static struct hlist_head inet6_addr_lst[IN6_ADDR_HSIZE];
5c578aed 135static DEFINE_SPINLOCK(addrconf_hash_lock);
1da177e4 136
c15b1cca
HFS		 137static void addrconf_verify(void);
138static void addrconf_verify_rtnl(void);
139static void addrconf_verify_work(struct work_struct *);
1da177e4 140
c15b1cca
HFS		 141static struct workqueue_struct *addrconf_wq;
142static DECLARE_DELAYED_WORK(addr_chk_work, addrconf_verify_work);
1da177e4
LT		 143
144static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
145static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
146
93d9b7d7
JP		 147static void addrconf_type_change(struct net_device *dev,
148 unsigned long event);
1da177e4
LT		 149static int addrconf_ifdown(struct net_device *dev, int how);
150
21caa662
RK		 151static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
152 int plen,
153 const struct net_device *dev,
154 u32 flags, u32 noflags);
155
cf22f9a2 156static void addrconf_dad_start(struct inet6_ifaddr *ifp);
c15b1cca 157static void addrconf_dad_work(struct work_struct *w);
1da177e4 158static void addrconf_dad_completed(struct inet6_ifaddr *ifp);
c5e33bdd 159static void addrconf_dad_run(struct inet6_dev *idev);
1da177e4
LT		 160static void addrconf_rs_timer(unsigned long data);
161static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
162static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
163
1ab1457c 164static void inet6_prefix_notify(int event, struct inet6_dev *idev,
1da177e4 165 struct prefix_info *pinfo);
3e81c6da
DM		 166static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
167 struct net_device *dev);
1da177e4 168
888c848e 169static struct ipv6_devconf ipv6_devconf __read_mostly = {
1da177e4
LT		 170 .forwarding = 0,
171 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
172 .mtu6 = IPV6_MIN_MTU,
173 .accept_ra = 1,
174 .accept_redirects = 1,
175 .autoconf = 1,
176 .force_mld_version = 0,
fc4eba58
HFS		 177 .mldv1_unsolicited_report_interval = 10 * HZ,
178 .mldv2_unsolicited_report_interval = HZ,
1da177e4
LT		 179 .dad_transmits = 1,
180 .rtr_solicits = MAX_RTR_SOLICITATIONS,
181 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
182 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
67ba4152 183 .use_tempaddr = 0,
1da177e4
LT		 184 .temp_valid_lft = TEMP_VALID_LIFETIME,
185 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
186 .regen_max_retry = REGEN_MAX_RETRY,
187 .max_desync_factor = MAX_DESYNC_FACTOR,
1da177e4 188 .max_addresses = IPV6_MAX_ADDRESSES,
65f5c7c1 189 .accept_ra_defrtr = 1,
d9333196 190 .accept_ra_from_local = 0,
c4fd30eb 191 .accept_ra_pinfo = 1,
930d6ff2
YH		 192#ifdef CONFIG_IPV6_ROUTER_PREF
193 .accept_ra_rtr_pref = 1,
52e16356 194 .rtr_probe_interval = 60 * HZ,
09c884d4
YH		 195#ifdef CONFIG_IPV6_ROUTE_INFO
196 .accept_ra_rt_info_max_plen = 0,
197#endif
930d6ff2 198#endif
fbea49e1 199 .proxy_ndp = 0,
0bcbc926 200 .accept_source_route = 0, /* we do not accept RH0 by default. */
778d80be 201 .disable_ipv6 = 0,
1b34be74 202 .accept_dad = 1,
b800c3b9 203 .suppress_frag_ndisc = 1,
1da177e4
LT		 204};
205
ab32ea5d 206static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
1da177e4
LT		 207 .forwarding = 0,
208 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
209 .mtu6 = IPV6_MIN_MTU,
210 .accept_ra = 1,
211 .accept_redirects = 1,
212 .autoconf = 1,
fc4eba58
HFS		 213 .force_mld_version = 0,
214 .mldv1_unsolicited_report_interval = 10 * HZ,
215 .mldv2_unsolicited_report_interval = HZ,
1da177e4
LT		 216 .dad_transmits = 1,
217 .rtr_solicits = MAX_RTR_SOLICITATIONS,
218 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
219 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
1da177e4
LT		 220 .use_tempaddr = 0,
221 .temp_valid_lft = TEMP_VALID_LIFETIME,
222 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
223 .regen_max_retry = REGEN_MAX_RETRY,
224 .max_desync_factor = MAX_DESYNC_FACTOR,
1da177e4 225 .max_addresses = IPV6_MAX_ADDRESSES,
65f5c7c1 226 .accept_ra_defrtr = 1,
d9333196 227 .accept_ra_from_local = 0,
c4fd30eb 228 .accept_ra_pinfo = 1,
930d6ff2
YH		 229#ifdef CONFIG_IPV6_ROUTER_PREF
230 .accept_ra_rtr_pref = 1,
52e16356 231 .rtr_probe_interval = 60 * HZ,
09c884d4
YH		 232#ifdef CONFIG_IPV6_ROUTE_INFO
233 .accept_ra_rt_info_max_plen = 0,
234#endif
930d6ff2 235#endif
fbea49e1 236 .proxy_ndp = 0,
0bcbc926 237 .accept_source_route = 0, /* we do not accept RH0 by default. */
778d80be 238 .disable_ipv6 = 0,
1b34be74 239 .accept_dad = 1,
b800c3b9 240 .suppress_frag_ndisc = 1,
1da177e4
LT		 241};
242
f24e3d65 243/* Check if a valid qdisc is available */
05297949 244static inline bool addrconf_qdisc_ok(const struct net_device *dev)
f24e3d65 245{
05297949 246 return !qdisc_tx_is_noop(dev);
f24e3d65
MC		 247}
248
b7b1bfce 249static void addrconf_del_rs_timer(struct inet6_dev *idev)
1da177e4 250{
b7b1bfce
HFS		 251 if (del_timer(&idev->rs_timer))
252 __in6_dev_put(idev);
253}
254
c15b1cca 255static void addrconf_del_dad_work(struct inet6_ifaddr *ifp)
b7b1bfce 256{
c15b1cca 257 if (cancel_delayed_work(&ifp->dad_work))
1da177e4
LT		 258 __in6_ifa_put(ifp);
259}
260
b7b1bfce
HFS		 261static void addrconf_mod_rs_timer(struct inet6_dev *idev,
262 unsigned long when)
263{
264 if (!timer_pending(&idev->rs_timer))
265 in6_dev_hold(idev);
266 mod_timer(&idev->rs_timer, jiffies + when);
267}
1da177e4 268
c15b1cca
HFS		 269static void addrconf_mod_dad_work(struct inet6_ifaddr *ifp,
270 unsigned long delay)
1da177e4 271{
c15b1cca 272 if (!delayed_work_pending(&ifp->dad_work))
1da177e4 273 in6_ifa_hold(ifp);
c15b1cca 274 mod_delayed_work(addrconf_wq, &ifp->dad_work, delay);
1da177e4
LT		 275}
276
7f7d9a6b
HX		 277static int snmp6_alloc_dev(struct inet6_dev *idev)
278{
827da44c
JS		 279 int i;
280
698365fa
WC		 281 idev->stats.ipv6 = alloc_percpu(struct ipstats_mib);
282 if (!idev->stats.ipv6)
7f7d9a6b 283 goto err_ip;
827da44c
JS		 284
285 for_each_possible_cpu(i) {
286 struct ipstats_mib *addrconf_stats;
698365fa 287 addrconf_stats = per_cpu_ptr(idev->stats.ipv6, i);
827da44c 288 u64_stats_init(&addrconf_stats->syncp);
827da44c
JS		 289 }
290
291
be281e55
ED		 292 idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device),
293 GFP_KERNEL);
294 if (!idev->stats.icmpv6dev)
7f7d9a6b 295 goto err_icmp;
be281e55
ED		 296 idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device),
297 GFP_KERNEL);
298 if (!idev->stats.icmpv6msgdev)
14878f75 299 goto err_icmpmsg;
7f7d9a6b
HX		 300
301 return 0;
302
14878f75 303err_icmpmsg:
be281e55 304 kfree(idev->stats.icmpv6dev);
7f7d9a6b 305err_icmp:
698365fa 306 free_percpu(idev->stats.ipv6);
7f7d9a6b 307err_ip:
aaf70ec7 308 return -ENOMEM;
7f7d9a6b
HX		 309}
310
8e5e8f30 311static struct inet6_dev *ipv6_add_dev(struct net_device *dev)
1da177e4
LT		 312{
313 struct inet6_dev *ndev;
a317a2f1 314 int err = -ENOMEM;
1da177e4
LT		 315
316 ASSERT_RTNL();
317
318 if (dev->mtu < IPV6_MIN_MTU)
a317a2f1 319 return ERR_PTR(-EINVAL);
1da177e4 320
1ab1457c 321 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
1ab1457c 322 if (ndev == NULL)
a317a2f1 323 return ERR_PTR(err);
322f74a4
IO		 324
325 rwlock_init(&ndev->lock);
326 ndev->dev = dev;
502a2ffd 327 INIT_LIST_HEAD(&ndev->addr_list);
b7b1bfce
HFS		 328 setup_timer(&ndev->rs_timer, addrconf_rs_timer,
329 (unsigned long)ndev);
c346dca1 330 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf));
322f74a4
IO		 331 ndev->cnf.mtu6 = dev->mtu;
332 ndev->cnf.sysctl = NULL;
333 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
334 if (ndev->nd_parms == NULL) {
335 kfree(ndev);
a317a2f1 336 return ERR_PTR(err);
322f74a4 337 }
0187bdfb
BH		 338 if (ndev->cnf.forwarding)
339 dev_disable_lro(dev);
322f74a4
IO		 340 /* We refer to the device */
341 dev_hold(dev);
1da177e4 342
322f74a4 343 if (snmp6_alloc_dev(ndev) < 0) {
ba3542e1 344 ADBG(KERN_WARNING
f3213831 345 "%s: cannot allocate memory for statistics; dev=%s.\n",
ba3542e1 346 __func__, dev->name);
322f74a4 347 neigh_parms_release(&nd_tbl, ndev->nd_parms);
8603e33d
RL		 348 dev_put(dev);
349 kfree(ndev);
a317a2f1 350 return ERR_PTR(err);
322f74a4 351 }
1da177e4 352
322f74a4 353 if (snmp6_register_dev(ndev) < 0) {
ba3542e1 354 ADBG(KERN_WARNING
f3213831 355 "%s: cannot create /proc/net/dev_snmp6/%s\n",
ba3542e1 356 __func__, dev->name);
a317a2f1 357 goto err_release;
322f74a4
IO		 358 }
359
360 /* One reference from device. We must do this before
361 * we invoke __ipv6_regen_rndid().
362 */
363 in6_dev_hold(ndev);
1da177e4 364
1b34be74
YH		 365 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
366 ndev->cnf.accept_dad = -1;
367
07a93626 368#if IS_ENABLED(CONFIG_IPV6_SIT)
b077d7ab 369 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
f3213831 370 pr_info("%s: Disabled Multicast RS\n", dev->name);
b077d7ab
YH		 371 ndev->cnf.rtr_solicits = 0;
372 }
373#endif
374
372e6c8f 375 INIT_LIST_HEAD(&ndev->tempaddr_list);
b24b8a24 376 setup_timer(&ndev->regen_timer, ipv6_regen_rndid, (unsigned long)ndev);
322f74a4
IO		 377 if ((dev->flags&IFF_LOOPBACK) ||
378 dev->type == ARPHRD_TUNNEL ||
9625ed72 379 dev->type == ARPHRD_TUNNEL6 ||
0be669bb 380 dev->type == ARPHRD_SIT ||
0be669bb 381 dev->type == ARPHRD_NONE) {
322f74a4
IO		 382 ndev->cnf.use_tempaddr = -1;
383 } else {
384 in6_dev_hold(ndev);
385 ipv6_regen_rndid((unsigned long) ndev);
386 }
5d9efa7e 387
914faa14 388 ndev->token = in6addr_any;
1da177e4 389
f24e3d65 390 if (netif_running(dev) && addrconf_qdisc_ok(dev))
53aadcc9
HX		 391 ndev->if_flags |= IF_READY;
392
322f74a4
IO		 393 ipv6_mc_init_dev(ndev);
394 ndev->tstamp = jiffies;
a317a2f1
WC		 395 err = addrconf_sysctl_register(ndev);
396 if (err) {
397 ipv6_mc_destroy_dev(ndev);
398 del_timer(&ndev->regen_timer);
399 goto err_release;
400 }
30c4cf57 401 /* protected by rtnl_lock */
cf778b00 402 rcu_assign_pointer(dev->ip6_ptr, ndev);
d88ae4cc 403
2c5e8933
HFS		 404 /* Join interface-local all-node multicast group */
405 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allnodes);
406
d88ae4cc 407 /* Join all-node multicast group */
f3ee4010 408 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);
d88ae4cc 409
d6ddef9e 410 /* Join all-router multicast group if forwarding is set */
8b2aaede 411 if (ndev->cnf.forwarding && (dev->flags & IFF_MULTICAST))
d6ddef9e
LW		 412 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
413
1da177e4 414 return ndev;
a317a2f1
WC		 415
416err_release:
417 neigh_parms_release(&nd_tbl, ndev->nd_parms);
418 ndev->dead = 1;
419 in6_dev_finish_destroy(ndev);
420 return ERR_PTR(err);
1da177e4
LT		 421}
422
8e5e8f30 423static struct inet6_dev *ipv6_find_idev(struct net_device *dev)
1da177e4
LT		 424{
425 struct inet6_dev *idev;
426
427 ASSERT_RTNL();
428
e21e8467
SH		 429 idev = __in6_dev_get(dev);
430 if (!idev) {
431 idev = ipv6_add_dev(dev);
a317a2f1 432 if (IS_ERR(idev))
1da177e4
LT		 433 return NULL;
434 }
c5e33bdd 435
1da177e4
LT		 436 if (dev->flags&IFF_UP)
437 ipv6_mc_up(idev);
438 return idev;
439}
440
f3a1bfb1
ND		 441static int inet6_netconf_msgsize_devconf(int type)
442{
443 int size = NLMSG_ALIGN(sizeof(struct netconfmsg))
444 + nla_total_size(4); /* NETCONFA_IFINDEX */
445
76f8f6cb
ND		 446 /* type -1 is used for ALL */
447 if (type == -1 || type == NETCONFA_FORWARDING)
f3a1bfb1 448 size += nla_total_size(4);
b1afce95 449#ifdef CONFIG_IPV6_MROUTE
d67b8c61
ND		 450 if (type == -1 || type == NETCONFA_MC_FORWARDING)
451 size += nla_total_size(4);
b1afce95 452#endif
c92d5491 453 if (type == -1 || type == NETCONFA_PROXY_NEIGH)
454 size += nla_total_size(4);
f3a1bfb1
ND		 455
456 return size;
457}
458
459static int inet6_netconf_fill_devconf(struct sk_buff *skb, int ifindex,
460 struct ipv6_devconf *devconf, u32 portid,
461 u32 seq, int event, unsigned int flags,
462 int type)
463{
464 struct nlmsghdr *nlh;
465 struct netconfmsg *ncm;
466
467 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg),
468 flags);
469 if (nlh == NULL)
470 return -EMSGSIZE;
471
472 ncm = nlmsg_data(nlh);
473 ncm->ncm_family = AF_INET6;
474
475 if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0)
476 goto nla_put_failure;
477
76f8f6cb
ND		 478 /* type -1 is used for ALL */
479 if ((type == -1 || type == NETCONFA_FORWARDING) &&
f3a1bfb1
ND		 480 nla_put_s32(skb, NETCONFA_FORWARDING, devconf->forwarding) < 0)
481 goto nla_put_failure;
b1afce95 482#ifdef CONFIG_IPV6_MROUTE
d67b8c61
ND		 483 if ((type == -1 || type == NETCONFA_MC_FORWARDING) &&
484 nla_put_s32(skb, NETCONFA_MC_FORWARDING,
485 devconf->mc_forwarding) < 0)
486 goto nla_put_failure;
b1afce95 487#endif
c92d5491 488 if ((type == -1 || type == NETCONFA_PROXY_NEIGH) &&
489 nla_put_s32(skb, NETCONFA_PROXY_NEIGH, devconf->proxy_ndp) < 0)
490 goto nla_put_failure;
491
f3a1bfb1
ND		 492 return nlmsg_end(skb, nlh);
493
494nla_put_failure:
495 nlmsg_cancel(skb, nlh);
496 return -EMSGSIZE;
497}
498
d67b8c61
ND		 499void inet6_netconf_notify_devconf(struct net *net, int type, int ifindex,
500 struct ipv6_devconf *devconf)
f3a1bfb1
ND		 501{
502 struct sk_buff *skb;
503 int err = -ENOBUFS;
504
505 skb = nlmsg_new(inet6_netconf_msgsize_devconf(type), GFP_ATOMIC);
506 if (skb == NULL)
507 goto errout;
508
509 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 0, 0,
510 RTM_NEWNETCONF, 0, type);
511 if (err < 0) {
512 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
513 WARN_ON(err == -EMSGSIZE);
514 kfree_skb(skb);
515 goto errout;
516 }
517 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_NETCONF, NULL, GFP_ATOMIC);
518 return;
519errout:
bd779028 520 rtnl_set_sk_err(net, RTNLGRP_IPV6_NETCONF, err);
f3a1bfb1
ND		 521}
522
76f8f6cb
ND		 523static const struct nla_policy devconf_ipv6_policy[NETCONFA_MAX+1] = {
524 [NETCONFA_IFINDEX] = { .len = sizeof(int) },
525 [NETCONFA_FORWARDING] = { .len = sizeof(int) },
c92d5491 526 [NETCONFA_PROXY_NEIGH] = { .len = sizeof(int) },
76f8f6cb
ND		 527};
528
529static int inet6_netconf_get_devconf(struct sk_buff *in_skb,
661d2967 530 struct nlmsghdr *nlh)
76f8f6cb
ND		 531{
532 struct net *net = sock_net(in_skb->sk);
533 struct nlattr *tb[NETCONFA_MAX+1];
534 struct netconfmsg *ncm;
535 struct sk_buff *skb;
536 struct ipv6_devconf *devconf;
537 struct inet6_dev *in6_dev;
538 struct net_device *dev;
539 int ifindex;
540 int err;
541
542 err = nlmsg_parse(nlh, sizeof(*ncm), tb, NETCONFA_MAX,
543 devconf_ipv6_policy);
544 if (err < 0)
545 goto errout;
546
547 err = EINVAL;
548 if (!tb[NETCONFA_IFINDEX])
549 goto errout;
550
551 ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]);
552 switch (ifindex) {
553 case NETCONFA_IFINDEX_ALL:
554 devconf = net->ipv6.devconf_all;
555 break;
556 case NETCONFA_IFINDEX_DEFAULT:
557 devconf = net->ipv6.devconf_dflt;
558 break;
559 default:
560 dev = __dev_get_by_index(net, ifindex);
561 if (dev == NULL)
562 goto errout;
563 in6_dev = __in6_dev_get(dev);
564 if (in6_dev == NULL)
565 goto errout;
566 devconf = &in6_dev->cnf;
567 break;
568 }
569
570 err = -ENOBUFS;
571 skb = nlmsg_new(inet6_netconf_msgsize_devconf(-1), GFP_ATOMIC);
572 if (skb == NULL)
573 goto errout;
574
575 err = inet6_netconf_fill_devconf(skb, ifindex, devconf,
576 NETLINK_CB(in_skb).portid,
577 nlh->nlmsg_seq, RTM_NEWNETCONF, 0,
578 -1);
579 if (err < 0) {
580 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
581 WARN_ON(err == -EMSGSIZE);
582 kfree_skb(skb);
583 goto errout;
584 }
585 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
586errout:
587 return err;
588}
589
7a674200
ND		 590static int inet6_netconf_dump_devconf(struct sk_buff *skb,
591 struct netlink_callback *cb)
592{
593 struct net *net = sock_net(skb->sk);
594 int h, s_h;
595 int idx, s_idx;
596 struct net_device *dev;
597 struct inet6_dev *idev;
598 struct hlist_head *head;
599
600 s_h = cb->args[0];
601 s_idx = idx = cb->args[1];
602
603 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
604 idx = 0;
605 head = &net->dev_index_head[h];
606 rcu_read_lock();
63998ac2
ND		 607 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^
608 net->dev_base_seq;
7a674200
ND		 609 hlist_for_each_entry_rcu(dev, head, index_hlist) {
610 if (idx < s_idx)
611 goto cont;
612 idev = __in6_dev_get(dev);
613 if (!idev)
614 goto cont;
615
616 if (inet6_netconf_fill_devconf(skb, dev->ifindex,
617 &idev->cnf,
618 NETLINK_CB(cb->skb).portid,
619 cb->nlh->nlmsg_seq,
620 RTM_NEWNETCONF,
621 NLM_F_MULTI,
622 -1) <= 0) {
623 rcu_read_unlock();
624 goto done;
625 }
63998ac2 626 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
7a674200
ND		 627cont:
628 idx++;
629 }
630 rcu_read_unlock();
631 }
632 if (h == NETDEV_HASHENTRIES) {
633 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL,
634 net->ipv6.devconf_all,
635 NETLINK_CB(cb->skb).portid,
636 cb->nlh->nlmsg_seq,
637 RTM_NEWNETCONF, NLM_F_MULTI,
638 -1) <= 0)
639 goto done;
640 else
641 h++;
642 }
643 if (h == NETDEV_HASHENTRIES + 1) {
644 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT,
645 net->ipv6.devconf_dflt,
646 NETLINK_CB(cb->skb).portid,
647 cb->nlh->nlmsg_seq,
648 RTM_NEWNETCONF, NLM_F_MULTI,
649 -1) <= 0)
650 goto done;
651 else
652 h++;
653 }
654done:
655 cb->args[0] = h;
656 cb->args[1] = idx;
657
658 return skb->len;
659}
660
1da177e4
LT		 661#ifdef CONFIG_SYSCTL
662static void dev_forward_change(struct inet6_dev *idev)
663{
664 struct net_device *dev;
665 struct inet6_ifaddr *ifa;
1da177e4
LT		 666
667 if (!idev)
668 return;
669 dev = idev->dev;
0187bdfb
BH		 670 if (idev->cnf.forwarding)
671 dev_disable_lro(dev);
1a940835 672 if (dev->flags & IFF_MULTICAST) {
2c5e8933 673 if (idev->cnf.forwarding) {
f3ee4010 674 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
2c5e8933
HFS		 675 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allrouters);
676 ipv6_dev_mc_inc(dev, &in6addr_sitelocal_allrouters);
677 } else {
f3ee4010 678 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
2c5e8933
HFS		 679 ipv6_dev_mc_dec(dev, &in6addr_interfacelocal_allrouters);
680 ipv6_dev_mc_dec(dev, &in6addr_sitelocal_allrouters);
681 }
1da177e4 682 }
502a2ffd 683
684 list_for_each_entry(ifa, &idev->addr_list, if_list) {
2c12a74c
MW		 685 if (ifa->flags&IFA_F_TENTATIVE)
686 continue;
1da177e4
LT		 687 if (idev->cnf.forwarding)
688 addrconf_join_anycast(ifa);
689 else
690 addrconf_leave_anycast(ifa);
691 }
f3a1bfb1
ND		 692 inet6_netconf_notify_devconf(dev_net(dev), NETCONFA_FORWARDING,
693 dev->ifindex, &idev->cnf);
1da177e4
LT		 694}
695
696
e186932b 697static void addrconf_forward_change(struct net *net, __s32 newf)
1da177e4
LT		 698{
699 struct net_device *dev;
700 struct inet6_dev *idev;
701
4acd4945 702 for_each_netdev(net, dev) {
1da177e4
LT		 703 idev = __in6_dev_get(dev);
704 if (idev) {
e186932b
PE		 705 int changed = (!idev->cnf.forwarding) ^ (!newf);
706 idev->cnf.forwarding = newf;
1da177e4
LT		 707 if (changed)
708 dev_forward_change(idev);
709 }
1da177e4 710 }
1da177e4 711}
c8fecf22 712
013d97e9 713static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf)
c8fecf22 714{
bff16c2f 715 struct net *net;
013d97e9
FR		 716 int old;
717
718 if (!rtnl_trylock())
719 return restart_syscall();
bff16c2f
PE		 720
721 net = (struct net *)table->extra2;
013d97e9
FR		 722 old = *p;
723 *p = newf;
b325fddb 724
013d97e9 725 if (p == &net->ipv6.devconf_dflt->forwarding) {
f3a1bfb1
ND		 726 if ((!newf) ^ (!old))
727 inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING,
728 NETCONFA_IFINDEX_DEFAULT,
729 net->ipv6.devconf_dflt);
013d97e9
FR		 730 rtnl_unlock();
731 return 0;
88af182e 732 }
c8fecf22 733
e186932b 734 if (p == &net->ipv6.devconf_all->forwarding) {
e186932b
PE		 735 net->ipv6.devconf_dflt->forwarding = newf;
736 addrconf_forward_change(net, newf);
f3a1bfb1
ND		 737 if ((!newf) ^ (!old))
738 inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING,
739 NETCONFA_IFINDEX_ALL,
740 net->ipv6.devconf_all);
013d97e9 741 } else if ((!newf) ^ (!old))
c8fecf22 742 dev_forward_change((struct inet6_dev *)table->extra1);
0187bdfb 743 rtnl_unlock();
c8fecf22 744
013d97e9 745 if (newf)
7b4da532 746 rt6_purge_dflt_routers(net);
b325fddb 747 return 1;
c8fecf22 748}
1da177e4
LT		 749#endif
750
5c578aed 751/* Nobody refers to this ifaddr, destroy it */
1da177e4
LT		 752void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
753{
c2e21293 754 WARN_ON(!hlist_unhashed(&ifp->addr_lst));
547b792c 755
1da177e4 756#ifdef NET_REFCNT_DEBUG
91df42be 757 pr_debug("%s\n", __func__);
1da177e4
LT		 758#endif
759
760 in6_dev_put(ifp->idev);
761
c15b1cca
HFS		 762 if (cancel_delayed_work(&ifp->dad_work))
763 pr_notice("delayed DAD work was pending while freeing ifa=%p\n",
764 ifp);
1da177e4 765
e9d3e084 766 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
f3213831 767 pr_warn("Freeing alive inet6 address %p\n", ifp);
1da177e4
LT		 768 return;
769 }
94e187c0 770 ip6_rt_put(ifp->rt);
1da177e4 771
e5785985 772 kfree_rcu(ifp, rcu);
1da177e4
LT		 773}
774
e55ffac6
BH		 775static void
776ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
777{
502a2ffd 778 struct list_head *p;
8a6ce0c0 779 int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
e55ffac6
BH		 780
781 /*
782 * Each device address list is sorted in order of scope -
783 * global before linklocal.
784 */
502a2ffd 785 list_for_each(p, &idev->addr_list) {
786 struct inet6_ifaddr *ifa
787 = list_entry(p, struct inet6_ifaddr, if_list);
8a6ce0c0 788 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
e55ffac6
BH		 789 break;
790 }
791
b54c9b98 792 list_add_tail(&ifp->if_list, p);
e55ffac6
BH		 793}
794
ddbe5032 795static u32 inet6_addr_hash(const struct in6_addr *addr)
3eb84f49 796{
ddbe5032 797 return hash_32(ipv6_addr_hash(addr), IN6_ADDR_HSIZE_SHIFT);
3eb84f49
YH		 798}
799
1da177e4
LT		 800/* On success it returns ifp with increased reference count */
801
802static struct inet6_ifaddr *
3f8f5298
JP		 803ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
804 const struct in6_addr *peer_addr, int pfxlen,
8a226b2c 805 int scope, u32 flags, u32 valid_lft, u32 prefered_lft)
1da177e4
LT		 806{
807 struct inet6_ifaddr *ifa = NULL;
808 struct rt6_info *rt;
3a88a81d 809 unsigned int hash;
1da177e4 810 int err = 0;
d68b8270
YH		 811 int addr_type = ipv6_addr_type(addr);
812
813 if (addr_type == IPV6_ADDR_ANY ||
814 addr_type & IPV6_ADDR_MULTICAST ||
815 (!(idev->dev->flags & IFF_LOOPBACK) &&
816 addr_type & IPV6_ADDR_LOOPBACK))
817 return ERR_PTR(-EADDRNOTAVAIL);
1da177e4 818
8814c4b5 819 rcu_read_lock_bh();
1da177e4
LT		 820 if (idev->dead) {
821 err = -ENODEV; /*XXX*/
822 goto out2;
823 }
824
56d417b1 825 if (idev->cnf.disable_ipv6) {
9bdd8d40
BH		 826 err = -EACCES;
827 goto out2;
828 }
829
5c578aed 830 spin_lock(&addrconf_hash_lock);
1da177e4
LT		 831
832 /* Ignore adding duplicate addresses on an interface */
c346dca1 833 if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) {
ba3542e1 834 ADBG("ipv6_add_addr: already assigned\n");
1da177e4
LT		 835 err = -EEXIST;
836 goto out;
837 }
838
322f74a4 839 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
1da177e4
LT		 840
841 if (ifa == NULL) {
ba3542e1 842 ADBG("ipv6_add_addr: malloc failed\n");
1da177e4
LT		 843 err = -ENOBUFS;
844 goto out;
845 }
846
8f031519 847 rt = addrconf_dst_alloc(idev, addr, false);
1da177e4
LT		 848 if (IS_ERR(rt)) {
849 err = PTR_ERR(rt);
850 goto out;
851 }
852
bba24896
JP		 853 neigh_parms_data_state_setall(idev->nd_parms);
854
4e3fd7a0 855 ifa->addr = *addr;
3f8f5298
JP		 856 if (peer_addr)
857 ifa->peer_addr = *peer_addr;
1da177e4
LT		 858
859 spin_lock_init(&ifa->lock);
e9d3e084 860 spin_lock_init(&ifa->state_lock);
c15b1cca 861 INIT_DELAYED_WORK(&ifa->dad_work, addrconf_dad_work);
c2e21293 862 INIT_HLIST_NODE(&ifa->addr_lst);
1da177e4
LT		 863 ifa->scope = scope;
864 ifa->prefix_len = pfxlen;
865 ifa->flags = flags | IFA_F_TENTATIVE;
8a226b2c
JB		 866 ifa->valid_lft = valid_lft;
867 ifa->prefered_lft = prefered_lft;
1da177e4 868 ifa->cstamp = ifa->tstamp = jiffies;
617fe29d 869 ifa->tokenized = false;
1da177e4 870
57f5f544
KF		 871 ifa->rt = rt;
872
1da177e4
LT		 873 ifa->idev = idev;
874 in6_dev_hold(idev);
875 /* For caller */
876 in6_ifa_hold(ifa);
877
878 /* Add to big hash table */
ddbe5032 879 hash = inet6_addr_hash(addr);
1da177e4 880
5c578aed 881 hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]);
5c578aed 882 spin_unlock(&addrconf_hash_lock);
1da177e4
LT		 883
884 write_lock(&idev->lock);
885 /* Add to inet6_dev unicast addr list. */
e55ffac6 886 ipv6_link_dev_addr(idev, ifa);
1da177e4 887
1da177e4 888 if (ifa->flags&IFA_F_TEMPORARY) {
372e6c8f 889 list_add(&ifa->tmp_list, &idev->tempaddr_list);
1da177e4
LT		 890 in6_ifa_hold(ifa);
891 }
1da177e4 892
1da177e4
LT		 893 in6_ifa_hold(ifa);
894 write_unlock(&idev->lock);
895out2:
8814c4b5 896 rcu_read_unlock_bh();
1da177e4 897
fd92833a 898 if (likely(err == 0))
f88c91dd 899 inet6addr_notifier_call_chain(NETDEV_UP, ifa);
1da177e4
LT		 900 else {
901 kfree(ifa);
902 ifa = ERR_PTR(err);
903 }
904
905 return ifa;
906out:
5c578aed 907 spin_unlock(&addrconf_hash_lock);
1da177e4
LT		 908 goto out2;
909}
910
5b84efec
TH		 911enum cleanup_prefix_rt_t {
912 CLEANUP_PREFIX_RT_NOP, /* no cleanup action for prefix route */
913 CLEANUP_PREFIX_RT_DEL, /* delete the prefix route */
914 CLEANUP_PREFIX_RT_EXPIRE, /* update the lifetime of the prefix route */
915};
916
917/*
918 * Check, whether the prefix for ifp would still need a prefix route
919 * after deleting ifp. The function returns one of the CLEANUP_PREFIX_RT_*
920 * constants.
921 *
922 * 1) we don't purge prefix if address was not permanent.
923 * prefix is managed by its own lifetime.
924 * 2) we also don't purge, if the address was IFA_F_NOPREFIXROUTE.
925 * 3) if there are no addresses, delete prefix.
926 * 4) if there are still other permanent address(es),
927 * corresponding prefix is still permanent.
928 * 5) if there are still other addresses with IFA_F_NOPREFIXROUTE,
929 * don't purge the prefix, assume user space is managing it.
930 * 6) otherwise, update prefix lifetime to the
931 * longest valid lifetime among the corresponding
932 * addresses on the device.
933 * Note: subsequent RA will update lifetime.
934 **/
935static enum cleanup_prefix_rt_t
936check_cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long *expires)
937{
938 struct inet6_ifaddr *ifa;
939 struct inet6_dev *idev = ifp->idev;
940 unsigned long lifetime;
941 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_DEL;
942
943 *expires = jiffies;
944
945 list_for_each_entry(ifa, &idev->addr_list, if_list) {
946 if (ifa == ifp)
947 continue;
948 if (!ipv6_prefix_equal(&ifa->addr, &ifp->addr,
949 ifp->prefix_len))
950 continue;
951 if (ifa->flags & (IFA_F_PERMANENT | IFA_F_NOPREFIXROUTE))
952 return CLEANUP_PREFIX_RT_NOP;
953
954 action = CLEANUP_PREFIX_RT_EXPIRE;
955
956 spin_lock(&ifa->lock);
957
958 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
959 /*
960 * Note: Because this address is
961 * not permanent, lifetime <
962 * LONG_MAX / HZ here.
963 */
964 if (time_before(*expires, ifa->tstamp + lifetime * HZ))
965 *expires = ifa->tstamp + lifetime * HZ;
966 spin_unlock(&ifa->lock);
967 }
968
969 return action;
970}
971
972static void
973cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long expires, bool del_rt)
974{
975 struct rt6_info *rt;
976
977 rt = addrconf_get_prefix_route(&ifp->addr,
978 ifp->prefix_len,
979 ifp->idev->dev,
980 0, RTF_GATEWAY | RTF_DEFAULT);
981 if (rt) {
982 if (del_rt)
983 ip6_del_rt(rt);
984 else {
985 if (!(rt->rt6i_flags & RTF_EXPIRES))
986 rt6_set_expires(rt, expires);
987 ip6_rt_put(rt);
988 }
989 }
990}
991
992
1da177e4
LT		 993/* This function wants to get referenced ifp and releases it before return */
994
995static void ipv6_del_addr(struct inet6_ifaddr *ifp)
996{
4c5ff6a6 997 int state;
5b84efec
TH		 998 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_NOP;
999 unsigned long expires;
1da177e4 1000
c15b1cca
HFS		 1001 ASSERT_RTNL();
1002
4c5ff6a6
HX		 1003 spin_lock_bh(&ifp->state_lock);
1004 state = ifp->state;
e9d3e084 1005 ifp->state = INET6_IFADDR_STATE_DEAD;
4c5ff6a6
HX		 1006 spin_unlock_bh(&ifp->state_lock);
1007
1008 if (state == INET6_IFADDR_STATE_DEAD)
1009 goto out;
1da177e4 1010
5c578aed 1011 spin_lock_bh(&addrconf_hash_lock);
1012 hlist_del_init_rcu(&ifp->addr_lst);
5c578aed 1013 spin_unlock_bh(&addrconf_hash_lock);
1da177e4 1014
5b84efec 1015 write_lock_bh(&ifp->idev->lock);
5d9efa7e 1016
1da177e4 1017 if (ifp->flags&IFA_F_TEMPORARY) {
372e6c8f 1018 list_del(&ifp->tmp_list);
1019 if (ifp->ifpub) {
1020 in6_ifa_put(ifp->ifpub);
1021 ifp->ifpub = NULL;
1da177e4 1022 }
372e6c8f 1023 __in6_ifa_put(ifp);
1da177e4 1024 }
1da177e4 1025
5b84efec
TH		 1026 if (ifp->flags & IFA_F_PERMANENT && !(ifp->flags & IFA_F_NOPREFIXROUTE))
1027 action = check_cleanup_prefix_route(ifp, &expires);
502a2ffd 1028
5b84efec
TH		 1029 list_del_init(&ifp->if_list);
1030 __in6_ifa_put(ifp);
1031
1032 write_unlock_bh(&ifp->idev->lock);
1da177e4 1033
c15b1cca 1034 addrconf_del_dad_work(ifp);
b2238566 1035
1da177e4
LT		 1036 ipv6_ifa_notify(RTM_DELADDR, ifp);
1037
f88c91dd 1038 inet6addr_notifier_call_chain(NETDEV_DOWN, ifp);
1da177e4 1039
5b84efec
TH		 1040 if (action != CLEANUP_PREFIX_RT_NOP) {
1041 cleanup_prefix_route(ifp, expires,
1042 action == CLEANUP_PREFIX_RT_DEL);
1da177e4
LT		 1043 }
1044
c3968a85
DW		 1045 /* clean up prefsrc entries */
1046 rt6_remove_prefsrc(ifp);
4c5ff6a6 1047out:
1da177e4
LT		 1048 in6_ifa_put(ifp);
1049}
1050
1da177e4
LT		 1051static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
1052{
1053 struct inet6_dev *idev = ifp->idev;
1054 struct in6_addr addr, *tmpaddr;
76f793e3 1055 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_tstamp, age;
eac55bf9 1056 unsigned long regen_advance;
1da177e4
LT		 1057 int tmp_plen;
1058 int ret = 0;
95c385b4 1059 u32 addr_flags;
76f793e3 1060 unsigned long now = jiffies;
1da177e4 1061
53bd6749 1062 write_lock_bh(&idev->lock);
1da177e4
LT		 1063 if (ift) {
1064 spin_lock_bh(&ift->lock);
1065 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
1066 spin_unlock_bh(&ift->lock);
1067 tmpaddr = &addr;
1068 } else {
1069 tmpaddr = NULL;
1070 }
1071retry:
1072 in6_dev_hold(idev);
1073 if (idev->cnf.use_tempaddr <= 0) {
53bd6749 1074 write_unlock_bh(&idev->lock);
f3213831 1075 pr_info("%s: use_tempaddr is disabled\n", __func__);
1da177e4
LT		 1076 in6_dev_put(idev);
1077 ret = -1;
1078 goto out;
1079 }
1080 spin_lock_bh(&ifp->lock);
1081 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
1082 idev->cnf.use_tempaddr = -1; /*XXX*/
1083 spin_unlock_bh(&ifp->lock);
53bd6749 1084 write_unlock_bh(&idev->lock);
f3213831
JP		 1085 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n",
1086 __func__);
1da177e4
LT		 1087 in6_dev_put(idev);
1088 ret = -1;
1089 goto out;
1090 }
1091 in6_ifa_hold(ifp);
1092 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
eb7e0575 1093 __ipv6_try_regen_rndid(idev, tmpaddr);
1da177e4 1094 memcpy(&addr.s6_addr[8], idev->rndid, 8);
76f793e3 1095 age = (now - ifp->tstamp) / HZ;
1da177e4
LT		 1096 tmp_valid_lft = min_t(__u32,
1097 ifp->valid_lft,
7a876b0e 1098 idev->cnf.temp_valid_lft + age);
1ab1457c
YH		 1099 tmp_prefered_lft = min_t(__u32,
1100 ifp->prefered_lft,
7a876b0e 1101 idev->cnf.temp_prefered_lft + age -
784e2710 1102 idev->cnf.max_desync_factor);
1da177e4 1103 tmp_plen = ifp->prefix_len;
1da177e4
LT		 1104 tmp_tstamp = ifp->tstamp;
1105 spin_unlock_bh(&ifp->lock);
1106
eac55bf9 1107 regen_advance = idev->cnf.regen_max_retry *
67ba4152
IM		 1108 idev->cnf.dad_transmits *
1109 NEIGH_VAR(idev->nd_parms, RETRANS_TIME) / HZ;
53bd6749 1110 write_unlock_bh(&idev->lock);
95c385b4 1111
eac55bf9
BB		 1112 /* A temporary address is created only if this calculated Preferred
1113 * Lifetime is greater than REGEN_ADVANCE time units. In particular,
1114 * an implementation must not create a temporary address with a zero
1115 * Preferred Lifetime.
ecab6701
HK		 1116 * Use age calculation as in addrconf_verify to avoid unnecessary
1117 * temporary addresses being generated.
eac55bf9 1118 */
ecab6701
HK		 1119 age = (now - tmp_tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
1120 if (tmp_prefered_lft <= regen_advance + age) {
eac55bf9
BB		 1121 in6_ifa_put(ifp);
1122 in6_dev_put(idev);
1123 ret = -1;
1124 goto out;
1125 }
1126
95c385b4
NH		 1127 addr_flags = IFA_F_TEMPORARY;
1128 /* set in addrconf_prefix_rcv() */
1129 if (ifp->flags & IFA_F_OPTIMISTIC)
1130 addr_flags |= IFA_F_OPTIMISTIC;
1131
4b08a8f1
HFS		 1132 ift = ipv6_add_addr(idev, &addr, NULL, tmp_plen,
1133 ipv6_addr_scope(&addr), addr_flags,
1134 tmp_valid_lft, tmp_prefered_lft);
1135 if (IS_ERR(ift)) {
1da177e4
LT		 1136 in6_ifa_put(ifp);
1137 in6_dev_put(idev);
f3213831 1138 pr_info("%s: retry temporary address regeneration\n", __func__);
1da177e4 1139 tmpaddr = &addr;
53bd6749 1140 write_lock_bh(&idev->lock);
1da177e4
LT		 1141 goto retry;
1142 }
1143
1144 spin_lock_bh(&ift->lock);
1145 ift->ifpub = ifp;
76f793e3 1146 ift->cstamp = now;
1da177e4
LT		 1147 ift->tstamp = tmp_tstamp;
1148 spin_unlock_bh(&ift->lock);
1149
cf22f9a2 1150 addrconf_dad_start(ift);
1da177e4
LT		 1151 in6_ifa_put(ift);
1152 in6_dev_put(idev);
1153out:
1154 return ret;
1155}
1da177e4
LT		 1156
1157/*
072047e4 1158 * Choose an appropriate source address (RFC3484)
1da177e4 1159 */
a9b05723
YH		 1160enum {
1161 IPV6_SADDR_RULE_INIT = 0,
1162 IPV6_SADDR_RULE_LOCAL,
1163 IPV6_SADDR_RULE_SCOPE,
1164 IPV6_SADDR_RULE_PREFERRED,
1165#ifdef CONFIG_IPV6_MIP6
1166 IPV6_SADDR_RULE_HOA,
1167#endif
1168 IPV6_SADDR_RULE_OIF,
1169 IPV6_SADDR_RULE_LABEL,
a9b05723 1170 IPV6_SADDR_RULE_PRIVACY,
a9b05723
YH		 1171 IPV6_SADDR_RULE_ORCHID,
1172 IPV6_SADDR_RULE_PREFIX,
7fd2561e
EK		 1173#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1174 IPV6_SADDR_RULE_NOT_OPTIMISTIC,
1175#endif
a9b05723
YH		 1176 IPV6_SADDR_RULE_MAX
1177};
1178
072047e4 1179struct ipv6_saddr_score {
a9b05723
YH		 1180 int rule;
1181 int addr_type;
1182 struct inet6_ifaddr *ifa;
1183 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
1184 int scopedist;
1185 int matchlen;
072047e4
YH		 1186};
1187
a9b05723 1188struct ipv6_saddr_dst {
9acd9f3a 1189 const struct in6_addr *addr;
a9b05723
YH		 1190 int ifindex;
1191 int scope;
1192 int label;
7cbca67c 1193 unsigned int prefs;
a9b05723 1194};
072047e4 1195
b6f99a21 1196static inline int ipv6_saddr_preferred(int type)
1da177e4 1197{
45bb0060 1198 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
072047e4
YH		 1199 return 1;
1200 return 0;
1da177e4
LT		 1201}
1202
7fd2561e
EK		 1203static inline bool ipv6_use_optimistic_addr(struct inet6_dev *idev)
1204{
1205#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1206 return idev && idev->cnf.optimistic_dad && idev->cnf.use_optimistic;
1207#else
1208 return false;
1209#endif
1210}
1211
3de23255
BT		 1212static int ipv6_get_saddr_eval(struct net *net,
1213 struct ipv6_saddr_score *score,
a9b05723
YH		 1214 struct ipv6_saddr_dst *dst,
1215 int i)
1216{
1217 int ret;
1218
1219 if (i <= score->rule) {
1220 switch (i) {
1221 case IPV6_SADDR_RULE_SCOPE:
1222 ret = score->scopedist;
1223 break;
1224 case IPV6_SADDR_RULE_PREFIX:
1225 ret = score->matchlen;
1226 break;
1227 default:
1228 ret = !!test_bit(i, score->scorebits);
1229 }
1230 goto out;
1231 }
1232
1233 switch (i) {
1234 case IPV6_SADDR_RULE_INIT:
1235 /* Rule 0: remember if hiscore is not ready yet */
1236 ret = !!score->ifa;
1237 break;
1238 case IPV6_SADDR_RULE_LOCAL:
1239 /* Rule 1: Prefer same address */
1240 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1241 break;
1242 case IPV6_SADDR_RULE_SCOPE:
1243 /* Rule 2: Prefer appropriate scope
1244 *
1245 * ret
1246 * ^
1247 * -1 | d 15
1248 * ---+--+-+---> scope
1249 * |
1250 * | d is scope of the destination.
1251 * B-d | \
1252 * | \ <- smaller scope is better if
db9c7c39 1253 * B-15 | \ if scope is enough for destination.
a9b05723
YH		 1254 * | ret = B - scope (-1 <= scope >= d <= 15).
1255 * d-C-1 | /
1256 * |/ <- greater is better
1257 * -C / if scope is not enough for destination.
1258 * /| ret = scope - C (-1 <= d < scope <= 15).
1259 *
1260 * d - C - 1 < B -15 (for all -1 <= d <= 15).
1261 * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1262 * Assume B = 0 and we get C > 29.
1263 */
1264 ret = __ipv6_addr_src_scope(score->addr_type);
1265 if (ret >= dst->scope)
1266 ret = -ret;
1267 else
1268 ret -= 128; /* 30 is enough */
1269 score->scopedist = ret;
1270 break;
1271 case IPV6_SADDR_RULE_PREFERRED:
7fd2561e 1272 {
a9b05723 1273 /* Rule 3: Avoid deprecated and optimistic addresses */
7fd2561e
EK		 1274 u8 avoid = IFA_F_DEPRECATED;
1275
1276 if (!ipv6_use_optimistic_addr(score->ifa->idev))
1277 avoid |= IFA_F_OPTIMISTIC;
a9b05723 1278 ret = ipv6_saddr_preferred(score->addr_type) ||
7fd2561e 1279 !(score->ifa->flags & avoid);
a9b05723 1280 break;
7fd2561e 1281 }
a9b05723
YH		 1282#ifdef CONFIG_IPV6_MIP6
1283 case IPV6_SADDR_RULE_HOA:
7cbca67c 1284 {
a9b05723 1285 /* Rule 4: Prefer home address */
7cbca67c
YH		 1286 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1287 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
a9b05723 1288 break;
7cbca67c 1289 }
a9b05723
YH		 1290#endif
1291 case IPV6_SADDR_RULE_OIF:
1292 /* Rule 5: Prefer outgoing interface */
1293 ret = (!dst->ifindex ||
1294 dst->ifindex == score->ifa->idev->dev->ifindex);
1295 break;
1296 case IPV6_SADDR_RULE_LABEL:
1297 /* Rule 6: Prefer matching label */
3de23255
BT		 1298 ret = ipv6_addr_label(net,
1299 &score->ifa->addr, score->addr_type,
a9b05723
YH		 1300 score->ifa->idev->dev->ifindex) == dst->label;
1301 break;
a9b05723 1302 case IPV6_SADDR_RULE_PRIVACY:
7cbca67c 1303 {
a9b05723 1304 /* Rule 7: Prefer public address
25985edc 1305 * Note: prefer temporary address if use_tempaddr >= 2
a9b05723 1306 */
7cbca67c
YH		 1307 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1308 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1309 score->ifa->idev->cnf.use_tempaddr >= 2;
1310 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
a9b05723 1311 break;
7cbca67c 1312 }
a9b05723
YH		 1313 case IPV6_SADDR_RULE_ORCHID:
1314 /* Rule 8-: Prefer ORCHID vs ORCHID or
1315 * non-ORCHID vs non-ORCHID
1316 */
1317 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1318 ipv6_addr_orchid(dst->addr));
1319 break;
1320 case IPV6_SADDR_RULE_PREFIX:
1321 /* Rule 8: Use longest matching prefix */
91b4b04f
YH		 1322 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr);
1323 if (ret > score->ifa->prefix_len)
1324 ret = score->ifa->prefix_len;
1325 score->matchlen = ret;
a9b05723 1326 break;
7fd2561e
EK		 1327#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1328 case IPV6_SADDR_RULE_NOT_OPTIMISTIC:
1329 /* Optimistic addresses still have lower precedence than other
1330 * preferred addresses.
1331 */
1332 ret = !(score->ifa->flags & IFA_F_OPTIMISTIC);
1333 break;
1334#endif
a9b05723
YH		 1335 default:
1336 ret = 0;
1337 }
1338
1339 if (ret)
1340 __set_bit(i, score->scorebits);
1341 score->rule = i;
1342out:
1343 return ret;
1344}
1345
b3f644fc 1346int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev,
9acd9f3a 1347 const struct in6_addr *daddr, unsigned int prefs,
7cbca67c 1348 struct in6_addr *saddr)
1da177e4 1349{
a9b05723
YH		 1350 struct ipv6_saddr_score scores[2],
1351 *score = &scores[0], *hiscore = &scores[1];
a9b05723 1352 struct ipv6_saddr_dst dst;
072047e4 1353 struct net_device *dev;
a9b05723 1354 int dst_type;
1da177e4 1355
a9b05723
YH		 1356 dst_type = __ipv6_addr_type(daddr);
1357 dst.addr = daddr;
1358 dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1359 dst.scope = __ipv6_addr_src_scope(dst_type);
3de23255 1360 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
7cbca67c 1361 dst.prefs = prefs;
a9b05723
YH		 1362
1363 hiscore->rule = -1;
1364 hiscore->ifa = NULL;
1da177e4 1365
8814c4b5 1366 rcu_read_lock();
1da177e4 1367
c6d14c84 1368 for_each_netdev_rcu(net, dev) {
072047e4 1369 struct inet6_dev *idev;
072047e4 1370
a9b05723 1371 /* Candidate Source Address (section 4)
072047e4
YH		 1372 * - multicast and link-local destination address,
1373 * the set of candidate source address MUST only
1374 * include addresses assigned to interfaces
1375 * belonging to the same link as the outgoing
1376 * interface.
1377 * (- For site-local destination addresses, the
1378 * set of candidate source addresses MUST only
1379 * include addresses assigned to interfaces
1380 * belonging to the same site as the outgoing
1381 * interface.)
1382 */
a9b05723
YH		 1383 if (((dst_type & IPV6_ADDR_MULTICAST) ||
1384 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL) &&
1385 dst.ifindex && dev->ifindex != dst.ifindex)
072047e4 1386 continue;
1da177e4 1387
1da177e4 1388 idev = __in6_dev_get(dev);
072047e4
YH		 1389 if (!idev)
1390 continue;
1391
1392 read_lock_bh(&idev->lock);
502a2ffd 1393 list_for_each_entry(score->ifa, &idev->addr_list, if_list) {
a9b05723 1394 int i;
072047e4 1395
a9b05723 1396 /*
6b3ae80a
YH		 1397 * - Tentative Address (RFC2462 section 5.4)
1398 * - A tentative address is not considered
1399 * "assigned to an interface" in the traditional
95c385b4 1400 * sense, unless it is also flagged as optimistic.
6b3ae80a 1401 * - Candidate Source Address (section 4)
072047e4
YH		 1402 * - In any case, anycast addresses, multicast
1403 * addresses, and the unspecified address MUST
1404 * NOT be included in a candidate set.
1405 */
a9b05723
YH		 1406 if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1407 (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
6b3ae80a 1408 continue;
a9b05723
YH		 1409
1410 score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1411
1412 if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1413 score->addr_type & IPV6_ADDR_MULTICAST)) {
ba7a46f1
JP		 1414 net_dbg_ratelimited("ADDRCONF: unspecified / multicast address assigned as unicast address on %s",
1415 dev->name);
072047e4
YH		 1416 continue;
1417 }
1418
a9b05723
YH		 1419 score->rule = -1;
1420 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1421
1422 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1423 int minihiscore, miniscore;
1424
3de23255
BT		 1425 minihiscore = ipv6_get_saddr_eval(net, hiscore, &dst, i);
1426 miniscore = ipv6_get_saddr_eval(net, score, &dst, i);
a9b05723
YH		 1427
1428 if (minihiscore > miniscore) {
1429 if (i == IPV6_SADDR_RULE_SCOPE &&
1430 score->scopedist > 0) {
1431 /*
1432 * special case:
1433 * each remaining entry
1434 * has too small (not enough)
1435 * scope, because ifa entries
1436 * are sorted by their scope
1437 * values.
1438 */
1439 goto try_nextdev;
1440 }
1441 break;
1442 } else if (minihiscore < miniscore) {
a9b05723
YH		 1443 if (hiscore->ifa)
1444 in6_ifa_put(hiscore->ifa);
1445
1446 in6_ifa_hold(score->ifa);
1447
a0bffffc 1448 swap(hiscore, score);
a9b05723
YH		 1449
1450 /* restore our iterator */
1451 score->ifa = hiscore->ifa;
1452
1453 break;
1da177e4 1454 }
072047e4 1455 }
1da177e4 1456 }
a9b05723 1457try_nextdev:
072047e4 1458 read_unlock_bh(&idev->lock);
1da177e4 1459 }
8814c4b5 1460 rcu_read_unlock();
1da177e4 1461
a9b05723 1462 if (!hiscore->ifa)
072047e4 1463 return -EADDRNOTAVAIL;
1ab1457c 1464
4e3fd7a0 1465 *saddr = hiscore->ifa->addr;
a9b05723 1466 in6_ifa_put(hiscore->ifa);
072047e4 1467 return 0;
1da177e4 1468}
5e5f3f0f 1469EXPORT_SYMBOL(ipv6_dev_get_saddr);
1da177e4 1470
8965779d 1471int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr,
479840ff 1472 u32 banned_flags)
b7b1bfce
HFS		 1473{
1474 struct inet6_ifaddr *ifp;
1475 int err = -EADDRNOTAVAIL;
1476
602582ca
HFS		 1477 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
1478 if (ifp->scope > IFA_LINK)
1479 break;
b7b1bfce
HFS		 1480 if (ifp->scope == IFA_LINK &&
1481 !(ifp->flags & banned_flags)) {
1482 *addr = ifp->addr;
1483 err = 0;
1484 break;
1485 }
1486 }
1487 return err;
1488}
1489
95c385b4 1490int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
479840ff 1491 u32 banned_flags)
1da177e4
LT		 1492{
1493 struct inet6_dev *idev;
1494 int err = -EADDRNOTAVAIL;
1495
8814c4b5 1496 rcu_read_lock();
e21e8467
SH		 1497 idev = __in6_dev_get(dev);
1498 if (idev) {
1da177e4 1499 read_lock_bh(&idev->lock);
b7b1bfce 1500 err = __ipv6_get_lladdr(idev, addr, banned_flags);
1da177e4
LT		 1501 read_unlock_bh(&idev->lock);
1502 }
8814c4b5 1503 rcu_read_unlock();
1da177e4
LT		 1504 return err;
1505}
1506
1507static int ipv6_count_addresses(struct inet6_dev *idev)
1508{
1509 int cnt = 0;
1510 struct inet6_ifaddr *ifp;
1511
1512 read_lock_bh(&idev->lock);
502a2ffd 1513 list_for_each_entry(ifp, &idev->addr_list, if_list)
1da177e4
LT		 1514 cnt++;
1515 read_unlock_bh(&idev->lock);
1516 return cnt;
1517}
1518
b71d1d42 1519int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
2a7851bf 1520 const struct net_device *dev, int strict)
c58da4c6
EK		 1521{
1522 return ipv6_chk_addr_and_flags(net, addr, dev, strict, IFA_F_TENTATIVE);
1523}
1524EXPORT_SYMBOL(ipv6_chk_addr);
1525
1526int ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr,
1527 const struct net_device *dev, int strict,
1528 u32 banned_flags)
1da177e4 1529{
eedf042a 1530 struct inet6_ifaddr *ifp;
ddbe5032 1531 unsigned int hash = inet6_addr_hash(addr);
c58da4c6 1532 u32 ifp_flags;
1da177e4 1533
5c578aed 1534 rcu_read_lock_bh();
b67bfe0d 1535 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
878628fb 1536 if (!net_eq(dev_net(ifp->idev->dev), net))
bfeade08 1537 continue;
c58da4c6
EK		 1538 /* Decouple optimistic from tentative for evaluation here.
1539 * Ban optimistic addresses explicitly, when required.
1540 */
1541 ifp_flags = (ifp->flags&IFA_F_OPTIMISTIC)
1542 ? (ifp->flags&~IFA_F_TENTATIVE)
1543 : ifp->flags;
1da177e4 1544 if (ipv6_addr_equal(&ifp->addr, addr) &&
c58da4c6 1545 !(ifp_flags&banned_flags) &&
eedf042a
SH		 1546 (dev == NULL || ifp->idev->dev == dev ||
1547 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) {
1548 rcu_read_unlock_bh();
1549 return 1;
1da177e4
LT		 1550 }
1551 }
5c578aed 1552
eedf042a
SH		 1553 rcu_read_unlock_bh();
1554 return 0;
1da177e4 1555}
c58da4c6 1556EXPORT_SYMBOL(ipv6_chk_addr_and_flags);
7159039a 1557
3e81c6da
DM		 1558static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1559 struct net_device *dev)
1da177e4 1560{
ddbe5032 1561 unsigned int hash = inet6_addr_hash(addr);
c2e21293 1562 struct inet6_ifaddr *ifp;
1da177e4 1563
b67bfe0d 1564 hlist_for_each_entry(ifp, &inet6_addr_lst[hash], addr_lst) {
878628fb 1565 if (!net_eq(dev_net(ifp->idev->dev), net))
06bfe655 1566 continue;
1da177e4
LT		 1567 if (ipv6_addr_equal(&ifp->addr, addr)) {
1568 if (dev == NULL || ifp->idev->dev == dev)
3e81c6da 1569 return true;
1da177e4
LT		 1570 }
1571 }
3e81c6da 1572 return false;
1da177e4
LT		 1573}
1574
7df37ff3
CB		 1575/* Compares an address/prefix_len with addresses on device @dev.
1576 * If one is found it returns true.
1577 */
1578bool ipv6_chk_custom_prefix(const struct in6_addr *addr,
1579 const unsigned int prefix_len, struct net_device *dev)
1580{
1581 struct inet6_dev *idev;
1582 struct inet6_ifaddr *ifa;
1583 bool ret = false;
1584
1585 rcu_read_lock();
1586 idev = __in6_dev_get(dev);
1587 if (idev) {
1588 read_lock_bh(&idev->lock);
1589 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1590 ret = ipv6_prefix_equal(addr, &ifa->addr, prefix_len);
1591 if (ret)
1592 break;
1593 }
1594 read_unlock_bh(&idev->lock);
1595 }
1596 rcu_read_unlock();
1597
1598 return ret;
1599}
1600EXPORT_SYMBOL(ipv6_chk_custom_prefix);
1601
b71d1d42 1602int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev)
52eeeb84
YH		 1603{
1604 struct inet6_dev *idev;
1605 struct inet6_ifaddr *ifa;
1606 int onlink;
1607
1608 onlink = 0;
1609 rcu_read_lock();
1610 idev = __in6_dev_get(dev);
1611 if (idev) {
1612 read_lock_bh(&idev->lock);
502a2ffd 1613 list_for_each_entry(ifa, &idev->addr_list, if_list) {
52eeeb84
YH		 1614 onlink = ipv6_prefix_equal(addr, &ifa->addr,
1615 ifa->prefix_len);
1616 if (onlink)
1617 break;
1618 }
1619 read_unlock_bh(&idev->lock);
1620 }
1621 rcu_read_unlock();
1622 return onlink;
1623}
52eeeb84
YH		 1624EXPORT_SYMBOL(ipv6_chk_prefix);
1625
9acd9f3a 1626struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1cab3da6 1627 struct net_device *dev, int strict)
1da177e4 1628{
b79d1d54 1629 struct inet6_ifaddr *ifp, *result = NULL;
ddbe5032 1630 unsigned int hash = inet6_addr_hash(addr);
1da177e4 1631
5c578aed 1632 rcu_read_lock_bh();
b67bfe0d 1633 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
878628fb 1634 if (!net_eq(dev_net(ifp->idev->dev), net))
1cab3da6 1635 continue;
1da177e4
LT		 1636 if (ipv6_addr_equal(&ifp->addr, addr)) {
1637 if (dev == NULL || ifp->idev->dev == dev ||
1638 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
b79d1d54 1639 result = ifp;
1da177e4
LT		 1640 in6_ifa_hold(ifp);
1641 break;
1642 }
1643 }
1644 }
5c578aed 1645 rcu_read_unlock_bh();
1da177e4 1646
b79d1d54 1647 return result;
1da177e4
LT		 1648}
1649
1da177e4
LT		 1650/* Gets referenced address, destroys ifaddr */
1651
cc411d0b 1652static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
1da177e4 1653{
1da177e4
LT		 1654 if (ifp->flags&IFA_F_PERMANENT) {
1655 spin_lock_bh(&ifp->lock);
c15b1cca 1656 addrconf_del_dad_work(ifp);
1da177e4 1657 ifp->flags |= IFA_F_TENTATIVE;
cc411d0b
BH		 1658 if (dad_failed)
1659 ifp->flags |= IFA_F_DADFAILED;
1da177e4 1660 spin_unlock_bh(&ifp->lock);
e2577a06
HX		 1661 if (dad_failed)
1662 ipv6_ifa_notify(0, ifp);
1da177e4 1663 in6_ifa_put(ifp);
1da177e4
LT		 1664 } else if (ifp->flags&IFA_F_TEMPORARY) {
1665 struct inet6_ifaddr *ifpub;
1666 spin_lock_bh(&ifp->lock);
1667 ifpub = ifp->ifpub;
1668 if (ifpub) {
1669 in6_ifa_hold(ifpub);
1670 spin_unlock_bh(&ifp->lock);
1671 ipv6_create_tempaddr(ifpub, ifp);
1672 in6_ifa_put(ifpub);
1673 } else {
1674 spin_unlock_bh(&ifp->lock);
1675 }
1676 ipv6_del_addr(ifp);
c15b1cca 1677 } else {
1da177e4 1678 ipv6_del_addr(ifp);
c15b1cca 1679 }
1da177e4
LT		 1680}
1681
f2344a13
HX		 1682static int addrconf_dad_end(struct inet6_ifaddr *ifp)
1683{
1684 int err = -ENOENT;
1685
c15b1cca 1686 spin_lock_bh(&ifp->state_lock);
f2344a13
HX		 1687 if (ifp->state == INET6_IFADDR_STATE_DAD) {
1688 ifp->state = INET6_IFADDR_STATE_POSTDAD;
1689 err = 0;
1690 }
c15b1cca 1691 spin_unlock_bh(&ifp->state_lock);
f2344a13
HX		 1692
1693 return err;
1694}
1695
3c21edbd
YH		 1696void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1697{
1b34be74 1698 struct inet6_dev *idev = ifp->idev;
9bdd8d40 1699
853dc2e0
UB		 1700 if (addrconf_dad_end(ifp)) {
1701 in6_ifa_put(ifp);
f2344a13 1702 return;
853dc2e0 1703 }
f2344a13 1704
e87cc472
JP		 1705 net_info_ratelimited("%s: IPv6 duplicate address %pI6c detected!\n",
1706 ifp->idev->dev->name, &ifp->addr);
9bdd8d40 1707
1b34be74
YH		 1708 if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6) {
1709 struct in6_addr addr;
1710
1711 addr.s6_addr32[0] = htonl(0xfe800000);
1712 addr.s6_addr32[1] = 0;
1713
1714 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
1715 ipv6_addr_equal(&ifp->addr, &addr)) {
1716 /* DAD failed for link-local based on MAC address */
1717 idev->cnf.disable_ipv6 = 1;
9bdd8d40 1718
f3213831 1719 pr_info("%s: IPv6 being disabled!\n",
9bdd8d40 1720 ifp->idev->dev->name);
1b34be74
YH		 1721 }
1722 }
1723
c15b1cca
HFS		 1724 spin_lock_bh(&ifp->state_lock);
1725 /* transition from _POSTDAD to _ERRDAD */
1726 ifp->state = INET6_IFADDR_STATE_ERRDAD;
1727 spin_unlock_bh(&ifp->state_lock);
1728
1729 addrconf_mod_dad_work(ifp, 0);
3c21edbd 1730}
1da177e4 1731
a9ed4a29
SD		 1732/* Join to solicited addr multicast group.
1733 * caller must hold RTNL */
b71d1d42 1734void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr)
1da177e4
LT		 1735{
1736 struct in6_addr maddr;
1737
1738 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1739 return;
1740
1741 addrconf_addr_solict_mult(addr, &maddr);
1742 ipv6_dev_mc_inc(dev, &maddr);
1743}
1744
a9ed4a29 1745/* caller must hold RTNL */
b71d1d42 1746void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr)
1da177e4
LT		 1747{
1748 struct in6_addr maddr;
1749
1750 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1751 return;
1752
1753 addrconf_addr_solict_mult(addr, &maddr);
1754 __ipv6_dev_mc_dec(idev, &maddr);
1755}
1756
a9ed4a29 1757/* caller must hold RTNL */
20380731 1758static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1da177e4
LT		 1759{
1760 struct in6_addr addr;
c15b1cca 1761
88ad3149 1762 if (ifp->prefix_len >= 127) /* RFC 6164 */
2bda8a0c 1763 return;
1da177e4
LT		 1764 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1765 if (ipv6_addr_any(&addr))
1766 return;
013b4d90 1767 __ipv6_dev_ac_inc(ifp->idev, &addr);
1da177e4
LT		 1768}
1769
a9ed4a29 1770/* caller must hold RTNL */
20380731 1771static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1da177e4
LT		 1772{
1773 struct in6_addr addr;
c15b1cca 1774
88ad3149 1775 if (ifp->prefix_len >= 127) /* RFC 6164 */
32019e65 1776 return;
1da177e4
LT		 1777 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1778 if (ipv6_addr_any(&addr))
1779 return;
1780 __ipv6_dev_ac_dec(ifp->idev, &addr);
1781}
1782
073a8e0e
YH		 1783static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
1784{
1785 if (dev->addr_len != ETH_ALEN)
1786 return -1;
1787 memcpy(eui, dev->dev_addr, 3);
1788 memcpy(eui + 5, dev->dev_addr + 3, 3);
1789
1790 /*
1791 * The zSeries OSA network cards can be shared among various
1792 * OS instances, but the OSA cards have only one MAC address.
1793 * This leads to duplicate address conflicts in conjunction
1794 * with IPv6 if more than one instance uses the same card.
1795 *
1796 * The driver for these cards can deliver a unique 16-bit
1797 * identifier for each instance sharing the same card. It is
1798 * placed instead of 0xFFFE in the interface identifier. The
1799 * "u" bit of the interface identifier is not inverted in this
1800 * case. Hence the resulting interface identifier has local
1801 * scope according to RFC2373.
1802 */
1803 if (dev->dev_id) {
1804 eui[3] = (dev->dev_id >> 8) & 0xFF;
1805 eui[4] = dev->dev_id & 0xFF;
1806 } else {
1807 eui[3] = 0xFF;
1808 eui[4] = 0xFE;
1809 eui[0] ^= 2;
1810 }
1811 return 0;
1812}
1813
06a4c1c5 1814static int addrconf_ifid_eui64(u8 *eui, struct net_device *dev)
1815{
1816 if (dev->addr_len != IEEE802154_ADDR_LEN)
1817 return -1;
1818 memcpy(eui, dev->dev_addr, 8);
5e98a36e 1819 eui[0] ^= 2;
06a4c1c5 1820 return 0;
1821}
1822
cb6bf355
YH		 1823static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev)
1824{
1825 union fwnet_hwaddr *ha;
1826
1827 if (dev->addr_len != FWNET_ALEN)
1828 return -1;
1829
1830 ha = (union fwnet_hwaddr *)dev->dev_addr;
1831
1832 memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id));
1833 eui[0] ^= 2;
1834 return 0;
1835}
1836
073a8e0e
YH		 1837static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1838{
1839 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1840 if (dev->addr_len != ARCNET_ALEN)
1841 return -1;
1842 memset(eui, 0, 7);
8e5e8f30 1843 eui[7] = *(u8 *)dev->dev_addr;
073a8e0e
YH		 1844 return 0;
1845}
1846
1847static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1848{
1849 if (dev->addr_len != INFINIBAND_ALEN)
1850 return -1;
1851 memcpy(eui, dev->dev_addr + 12, 8);
1852 eui[0] |= 2;
1853 return 0;
1854}
1855
c61393ea 1856static int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
dfd982ba 1857{
9af28511
SH		 1858 if (addr == 0)
1859 return -1;
dfd982ba
YH		 1860 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
1861 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
1862 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
1863 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
1864 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
1865 ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
1866 eui[1] = 0;
1867 eui[2] = 0x5E;
1868 eui[3] = 0xFE;
1869 memcpy(eui + 4, &addr, 4);
1870 return 0;
1871}
dfd982ba
YH		 1872
1873static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
1874{
1875 if (dev->priv_flags & IFF_ISATAP)
1876 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1877 return -1;
1878}
1879
aee80b54 1880static int addrconf_ifid_gre(u8 *eui, struct net_device *dev)
1881{
1882 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1883}
1884
e837735e
ND		 1885static int addrconf_ifid_ip6tnl(u8 *eui, struct net_device *dev)
1886{
1887 memcpy(eui, dev->perm_addr, 3);
1888 memcpy(eui + 5, dev->perm_addr + 3, 3);
1889 eui[3] = 0xFF;
1890 eui[4] = 0xFE;
1891 eui[0] ^= 2;
1892 return 0;
1893}
1894
1da177e4
LT		 1895static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1896{
1897 switch (dev->type) {
1898 case ARPHRD_ETHER:
1899 case ARPHRD_FDDI:
073a8e0e 1900 return addrconf_ifid_eui48(eui, dev);
1da177e4 1901 case ARPHRD_ARCNET:
073a8e0e 1902 return addrconf_ifid_arcnet(eui, dev);
1da177e4 1903 case ARPHRD_INFINIBAND:
073a8e0e 1904 return addrconf_ifid_infiniband(eui, dev);
c7dc89c0 1905 case ARPHRD_SIT:
dfd982ba 1906 return addrconf_ifid_sit(eui, dev);
aee80b54 1907 case ARPHRD_IPGRE:
1908 return addrconf_ifid_gre(eui, dev);
e74bccb8 1909 case ARPHRD_6LOWPAN:
06a4c1c5 1910 case ARPHRD_IEEE802154:
1911 return addrconf_ifid_eui64(eui, dev);
cb6bf355
YH		 1912 case ARPHRD_IEEE1394:
1913 return addrconf_ifid_ieee1394(eui, dev);
e837735e
ND		 1914 case ARPHRD_TUNNEL6:
1915 return addrconf_ifid_ip6tnl(eui, dev);
1da177e4
LT		 1916 }
1917 return -1;
1918}
1919
1920static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1921{
1922 int err = -1;
1923 struct inet6_ifaddr *ifp;
1924
1925 read_lock_bh(&idev->lock);
602582ca
HFS		 1926 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
1927 if (ifp->scope > IFA_LINK)
1928 break;
1da177e4
LT		 1929 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1930 memcpy(eui, ifp->addr.s6_addr+8, 8);
1931 err = 0;
1932 break;
1933 }
1934 }
1935 read_unlock_bh(&idev->lock);
1936 return err;
1937}
1938
1da177e4 1939/* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
eb7e0575 1940static void __ipv6_regen_rndid(struct inet6_dev *idev)
1da177e4 1941{
1da177e4 1942regen:
955189ef 1943 get_random_bytes(idev->rndid, sizeof(idev->rndid));
1da177e4 1944 idev->rndid[0] &= ~0x02;
1da177e4
LT		 1945
1946 /*
1947 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1948 * check if generated address is not inappropriate
1949 *
1950 * - Reserved subnet anycast (RFC 2526)
1951 * 11111101 11....11 1xxxxxxx
c7dc89c0 1952 * - ISATAP (RFC4214) 6.1
1da177e4
LT		 1953 * 00-00-5E-FE-xx-xx-xx-xx
1954 * - value 0
1955 * - XXX: already assigned to an address on the device
1956 */
1ab1457c 1957 if (idev->rndid[0] == 0xfd &&
1da177e4
LT		 1958 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1959 (idev->rndid[7]&0x80))
1960 goto regen;
1961 if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1962 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1963 goto regen;
1964 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1965 goto regen;
1966 }
1da177e4
LT		 1967}
1968
1969static void ipv6_regen_rndid(unsigned long data)
1970{
1971 struct inet6_dev *idev = (struct inet6_dev *) data;
1972 unsigned long expires;
1973
8814c4b5 1974 rcu_read_lock_bh();
1da177e4
LT		 1975 write_lock_bh(&idev->lock);
1976
1977 if (idev->dead)
1978 goto out;
1979
eb7e0575 1980 __ipv6_regen_rndid(idev);
1ab1457c 1981
1da177e4 1982 expires = jiffies +
1ab1457c 1983 idev->cnf.temp_prefered_lft * HZ -
1f9248e5
JP		 1984 idev->cnf.regen_max_retry * idev->cnf.dad_transmits *
1985 NEIGH_VAR(idev->nd_parms, RETRANS_TIME) -
784e2710 1986 idev->cnf.max_desync_factor * HZ;
1da177e4 1987 if (time_before(expires, jiffies)) {
f3213831
JP		 1988 pr_warn("%s: too short regeneration interval; timer disabled for %s\n",
1989 __func__, idev->dev->name);
1da177e4
LT		 1990 goto out;
1991 }
1992
1993 if (!mod_timer(&idev->regen_timer, expires))
1994 in6_dev_hold(idev);
1995
1996out:
1997 write_unlock_bh(&idev->lock);
8814c4b5 1998 rcu_read_unlock_bh();
1da177e4
LT		 1999 in6_dev_put(idev);
2000}
2001
eb7e0575 2002static void __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr)
8e5e8f30 2003{
1da177e4 2004 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
eb7e0575 2005 __ipv6_regen_rndid(idev);
1da177e4 2006}
1da177e4
LT		 2007
2008/*
2009 * Add prefix route.
2010 */
2011
2012static void
2013addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
e431b8c0 2014 unsigned long expires, u32 flags)
1da177e4 2015{
86872cb5
TG		 2016 struct fib6_config cfg = {
2017 .fc_table = RT6_TABLE_PREFIX,
2018 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2019 .fc_ifindex = dev->ifindex,
2020 .fc_expires = expires,
2021 .fc_dst_len = plen,
2022 .fc_flags = RTF_UP | flags,
c346dca1 2023 .fc_nlinfo.nl_net = dev_net(dev),
f410a1fb 2024 .fc_protocol = RTPROT_KERNEL,
86872cb5 2025 };
1da177e4 2026
4e3fd7a0 2027 cfg.fc_dst = *pfx;
1da177e4
LT		 2028
2029 /* Prevent useless cloning on PtP SIT.
2030 This thing is done here expecting that the whole
2031 class of non-broadcast devices need not cloning.
2032 */
07a93626 2033#if IS_ENABLED(CONFIG_IPV6_SIT)
86872cb5
TG		 2034 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
2035 cfg.fc_flags |= RTF_NONEXTHOP;
0be669bb 2036#endif
1da177e4 2037
86872cb5 2038 ip6_route_add(&cfg);
1da177e4
LT		 2039}
2040
14ef37b6
AH		 2041
2042static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
2043 int plen,
2044 const struct net_device *dev,
2045 u32 flags, u32 noflags)
2046{
2047 struct fib6_node *fn;
2048 struct rt6_info *rt = NULL;
2049 struct fib6_table *table;
2050
2051 table = fib6_get_table(dev_net(dev), RT6_TABLE_PREFIX);
2052 if (table == NULL)
2053 return NULL;
2054
5744dd9b 2055 read_lock_bh(&table->tb6_lock);
14ef37b6
AH		 2056 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0);
2057 if (!fn)
2058 goto out;
2059 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
d1918542 2060 if (rt->dst.dev->ifindex != dev->ifindex)
14ef37b6
AH		 2061 continue;
2062 if ((rt->rt6i_flags & flags) != flags)
2063 continue;
85da53bf 2064 if ((rt->rt6i_flags & noflags) != 0)
14ef37b6
AH		 2065 continue;
2066 dst_hold(&rt->dst);
2067 break;
2068 }
2069out:
5744dd9b 2070 read_unlock_bh(&table->tb6_lock);
14ef37b6
AH		 2071 return rt;
2072}
2073
2074
1da177e4
LT		 2075/* Create "default" multicast route to the interface */
2076
2077static void addrconf_add_mroute(struct net_device *dev)
2078{
86872cb5
TG		 2079 struct fib6_config cfg = {
2080 .fc_table = RT6_TABLE_LOCAL,
2081 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2082 .fc_ifindex = dev->ifindex,
2083 .fc_dst_len = 8,
2084 .fc_flags = RTF_UP,
c346dca1 2085 .fc_nlinfo.nl_net = dev_net(dev),
86872cb5
TG		 2086 };
2087
2088 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
2089
2090 ip6_route_add(&cfg);
1da177e4
LT		 2091}
2092
1da177e4
LT		 2093static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
2094{
2095 struct inet6_dev *idev;
2096
2097 ASSERT_RTNL();
2098
e21e8467
SH		 2099 idev = ipv6_find_idev(dev);
2100 if (!idev)
64e724f6
BH		 2101 return ERR_PTR(-ENOBUFS);
2102
2103 if (idev->cnf.disable_ipv6)
2104 return ERR_PTR(-EACCES);
1da177e4
LT		 2105
2106 /* Add default multicast route */
4af04aba
LW		 2107 if (!(dev->flags & IFF_LOOPBACK))
2108 addrconf_add_mroute(dev);
1da177e4 2109
1da177e4
LT		 2110 return idev;
2111}
2112
53bd6749
JP		 2113static void manage_tempaddrs(struct inet6_dev *idev,
2114 struct inet6_ifaddr *ifp,
2115 __u32 valid_lft, __u32 prefered_lft,
2116 bool create, unsigned long now)
2117{
2118 u32 flags;
2119 struct inet6_ifaddr *ift;
2120
2121 read_lock_bh(&idev->lock);
2122 /* update all temporary addresses in the list */
2123 list_for_each_entry(ift, &idev->tempaddr_list, tmp_list) {
2124 int age, max_valid, max_prefered;
2125
2126 if (ifp != ift->ifpub)
2127 continue;
2128
2129 /* RFC 4941 section 3.3:
2130 * If a received option will extend the lifetime of a public
2131 * address, the lifetimes of temporary addresses should
2132 * be extended, subject to the overall constraint that no
2133 * temporary addresses should ever remain "valid" or "preferred"
2134 * for a time longer than (TEMP_VALID_LIFETIME) or
2135 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), respectively.
2136 */
2137 age = (now - ift->cstamp) / HZ;
2138 max_valid = idev->cnf.temp_valid_lft - age;
2139 if (max_valid < 0)
2140 max_valid = 0;
2141
2142 max_prefered = idev->cnf.temp_prefered_lft -
2143 idev->cnf.max_desync_factor - age;
2144 if (max_prefered < 0)
2145 max_prefered = 0;
2146
2147 if (valid_lft > max_valid)
2148 valid_lft = max_valid;
2149
2150 if (prefered_lft > max_prefered)
2151 prefered_lft = max_prefered;
2152
2153 spin_lock(&ift->lock);
2154 flags = ift->flags;
2155 ift->valid_lft = valid_lft;
2156 ift->prefered_lft = prefered_lft;
2157 ift->tstamp = now;
2158 if (prefered_lft > 0)
2159 ift->flags &= ~IFA_F_DEPRECATED;
2160
2161 spin_unlock(&ift->lock);
2162 if (!(flags&IFA_F_TENTATIVE))
2163 ipv6_ifa_notify(0, ift);
2164 }
2165
2166 if ((create || list_empty(&idev->tempaddr_list)) &&
2167 idev->cnf.use_tempaddr > 0) {
2168 /* When a new public address is created as described
2169 * in [ADDRCONF], also create a new temporary address.
2170 * Also create a temporary address if it's enabled but
2171 * no temporary address currently exists.
2172 */
2173 read_unlock_bh(&idev->lock);
2174 ipv6_create_tempaddr(ifp, NULL);
2175 } else {
2176 read_unlock_bh(&idev->lock);
2177 }
2178}
2179
e6bff995 2180void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao)
1da177e4
LT		 2181{
2182 struct prefix_info *pinfo;
2183 __u32 valid_lft;
2184 __u32 prefered_lft;
2185 int addr_type;
1da177e4 2186 struct inet6_dev *in6_dev;
56d417b1 2187 struct net *net = dev_net(dev);
1da177e4
LT		 2188
2189 pinfo = (struct prefix_info *) opt;
1ab1457c 2190
1da177e4 2191 if (len < sizeof(struct prefix_info)) {
ba3542e1 2192 ADBG("addrconf: prefix option too short\n");
1da177e4
LT		 2193 return;
2194 }
1ab1457c 2195
1da177e4
LT		 2196 /*
2197 * Validation checks ([ADDRCONF], page 19)
2198 */
2199
2200 addr_type = ipv6_addr_type(&pinfo->prefix);
2201
2202 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
2203 return;
2204
2205 valid_lft = ntohl(pinfo->valid);
2206 prefered_lft = ntohl(pinfo->prefered);
2207
2208 if (prefered_lft > valid_lft) {
e87cc472 2209 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n");
1da177e4
LT		 2210 return;
2211 }
2212
2213 in6_dev = in6_dev_get(dev);
2214
2215 if (in6_dev == NULL) {
e87cc472
JP		 2216 net_dbg_ratelimited("addrconf: device %s not configured\n",
2217 dev->name);
1da177e4
LT		 2218 return;
2219 }
2220
2221 /*
2222 * Two things going on here:
2223 * 1) Add routes for on-link prefixes
2224 * 2) Configure prefixes with the auto flag set
2225 */
2226
4bed72e4
YH		 2227 if (pinfo->onlink) {
2228 struct rt6_info *rt;
2229 unsigned long rt_expires;
2230
6f704992
YH		 2231 /* Avoid arithmetic overflow. Really, we could
2232 * save rt_expires in seconds, likely valid_lft,
2233 * but it would require division in fib gc, that it
2234 * not good.
2235 */
4bed72e4
YH		 2236 if (HZ > USER_HZ)
2237 rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
2238 else
2239 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
3dd4bc68 2240
4bed72e4
YH		 2241 if (addrconf_finite_timeout(rt_expires))
2242 rt_expires *= HZ;
1da177e4 2243
14ef37b6
AH		 2244 rt = addrconf_get_prefix_route(&pinfo->prefix,
2245 pinfo->prefix_len,
2246 dev,
2247 RTF_ADDRCONF | RTF_PREFIX_RT,
2248 RTF_GATEWAY | RTF_DEFAULT);
1da177e4 2249
14ef37b6 2250 if (rt) {
6f704992
YH		 2251 /* Autoconf prefix route */
2252 if (valid_lft == 0) {
2253 ip6_del_rt(rt);
2254 rt = NULL;
4bed72e4 2255 } else if (addrconf_finite_timeout(rt_expires)) {
6f704992 2256 /* not infinity */
1716a961 2257 rt6_set_expires(rt, jiffies + rt_expires);
6f704992 2258 } else {
1716a961 2259 rt6_clean_expires(rt);
1da177e4
LT		 2260 }
2261 } else if (valid_lft) {
6f704992 2262 clock_t expires = 0;
4bed72e4
YH		 2263 int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
2264 if (addrconf_finite_timeout(rt_expires)) {
6f704992
YH		 2265 /* not infinity */
2266 flags |= RTF_EXPIRES;
2267 expires = jiffies_to_clock_t(rt_expires);
2268 }
1da177e4 2269 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
6f704992 2270 dev, expires, flags);
1da177e4 2271 }
94e187c0 2272 ip6_rt_put(rt);
1da177e4
LT		 2273 }
2274
2275 /* Try to figure out our local address for this prefix */
2276
2277 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
8e5e8f30 2278 struct inet6_ifaddr *ifp;
1da177e4
LT		 2279 struct in6_addr addr;
2280 int create = 0, update_lft = 0;
617fe29d 2281 bool tokenized = false;
1da177e4
LT		 2282
2283 if (pinfo->prefix_len == 64) {
2284 memcpy(&addr, &pinfo->prefix, 8);
f53adae4
DB		 2285
2286 if (!ipv6_addr_any(&in6_dev->token)) {
2287 read_lock_bh(&in6_dev->lock);
2288 memcpy(addr.s6_addr + 8,
2289 in6_dev->token.s6_addr + 8, 8);
2290 read_unlock_bh(&in6_dev->lock);
617fe29d 2291 tokenized = true;
f53adae4
DB		 2292 } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
2293 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
1da177e4
LT		 2294 in6_dev_put(in6_dev);
2295 return;
2296 }
2297 goto ok;
2298 }
e87cc472
JP		 2299 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n",
2300 pinfo->prefix_len);
1da177e4
LT		 2301 in6_dev_put(in6_dev);
2302 return;
2303
2304ok:
2305
53b7997f 2306 ifp = ipv6_get_ifaddr(net, &addr, dev, 1);
1da177e4
LT		 2307
2308 if (ifp == NULL && valid_lft) {
2309 int max_addresses = in6_dev->cnf.max_addresses;
95c385b4
NH		 2310 u32 addr_flags = 0;
2311
2312#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2313 if (in6_dev->cnf.optimistic_dad &&
e6bff995 2314 !net->ipv6.devconf_all->forwarding && sllao)
95c385b4
NH		 2315 addr_flags = IFA_F_OPTIMISTIC;
2316#endif
1da177e4
LT		 2317
2318 /* Do not allow to create too much of autoconfigured
2319 * addresses; this would be too easy way to crash kernel.
2320 */
2321 if (!max_addresses ||
2322 ipv6_count_addresses(in6_dev) < max_addresses)
3f8f5298
JP		 2323 ifp = ipv6_add_addr(in6_dev, &addr, NULL,
2324 pinfo->prefix_len,
95c385b4 2325 addr_type&IPV6_ADDR_SCOPE_MASK,
8a226b2c
JB		 2326 addr_flags, valid_lft,
2327 prefered_lft);
1da177e4 2328
3f0d2ba0 2329 if (IS_ERR_OR_NULL(ifp)) {
1da177e4
LT		 2330 in6_dev_put(in6_dev);
2331 return;
2332 }
2333
8a226b2c
JB		 2334 update_lft = 0;
2335 create = 1;
c15b1cca
HFS		 2336 spin_lock_bh(&ifp->lock);
2337 ifp->flags |= IFA_F_MANAGETEMPADDR;
1da177e4 2338 ifp->cstamp = jiffies;
617fe29d 2339 ifp->tokenized = tokenized;
c15b1cca 2340 spin_unlock_bh(&ifp->lock);
cf22f9a2 2341 addrconf_dad_start(ifp);
1da177e4
LT		 2342 }
2343
2344 if (ifp) {
479840ff 2345 u32 flags;
1da177e4 2346 unsigned long now;
1da177e4
LT		 2347 u32 stored_lft;
2348
2349 /* update lifetime (RFC2462 5.5.3 e) */
2350 spin_lock(&ifp->lock);
2351 now = jiffies;
2352 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
2353 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
2354 else
2355 stored_lft = 0;
8a226b2c 2356 if (!update_lft && !create && stored_lft) {
9451a304
FF		 2357 const u32 minimum_lft = min_t(u32,
2358 stored_lft, MIN_VALID_LIFETIME);
c9d55d5b
PM		 2359 valid_lft = max(valid_lft, minimum_lft);
2360
2361 /* RFC4862 Section 5.5.3e:
2362 * "Note that the preferred lifetime of the
2363 * corresponding address is always reset to
2364 * the Preferred Lifetime in the received
2365 * Prefix Information option, regardless of
2366 * whether the valid lifetime is also reset or
2367 * ignored."
2368 *
2369 * So we should always update prefered_lft here.
2370 */
2371 update_lft = 1;
1da177e4
LT		 2372 }
2373
2374 if (update_lft) {
2375 ifp->valid_lft = valid_lft;
2376 ifp->prefered_lft = prefered_lft;
2377 ifp->tstamp = now;
2378 flags = ifp->flags;
2379 ifp->flags &= ~IFA_F_DEPRECATED;
2380 spin_unlock(&ifp->lock);
2381
2382 if (!(flags&IFA_F_TENTATIVE))
2383 ipv6_ifa_notify(0, ifp);
2384 } else
2385 spin_unlock(&ifp->lock);
2386
53bd6749
JP		 2387 manage_tempaddrs(in6_dev, ifp, valid_lft, prefered_lft,
2388 create, now);
5d9efa7e 2389
1da177e4 2390 in6_ifa_put(ifp);
c15b1cca 2391 addrconf_verify();
1da177e4
LT		 2392 }
2393 }
2394 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
2395 in6_dev_put(in6_dev);
2396}
2397
2398/*
2399 * Set destination address.
2400 * Special case for SIT interfaces where we create a new "virtual"
2401 * device.
2402 */
af284937 2403int addrconf_set_dstaddr(struct net *net, void __user *arg)
1da177e4
LT		 2404{
2405 struct in6_ifreq ireq;
2406 struct net_device *dev;
2407 int err = -EINVAL;
2408
2409 rtnl_lock();
2410
2411 err = -EFAULT;
2412 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2413 goto err_exit;
2414
af284937 2415 dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
1da177e4
LT		 2416
2417 err = -ENODEV;
2418 if (dev == NULL)
2419 goto err_exit;
2420
07a93626 2421#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4 2422 if (dev->type == ARPHRD_SIT) {
5bc3eb7e 2423 const struct net_device_ops *ops = dev->netdev_ops;
1da177e4 2424 struct ifreq ifr;
1da177e4
LT		 2425 struct ip_tunnel_parm p;
2426
2427 err = -EADDRNOTAVAIL;
2428 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2429 goto err_exit;
2430
2431 memset(&p, 0, sizeof(p));
2432 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2433 p.iph.saddr = 0;
2434 p.iph.version = 4;
2435 p.iph.ihl = 5;
2436 p.iph.protocol = IPPROTO_IPV6;
2437 p.iph.ttl = 64;
d20b3109 2438 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
1da177e4 2439
5bc3eb7e
SH		 2440 if (ops->ndo_do_ioctl) {
2441 mm_segment_t oldfs = get_fs();
2442
2443 set_fs(KERNEL_DS);
2444 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2445 set_fs(oldfs);
2446 } else
2447 err = -EOPNOTSUPP;
1da177e4
LT		 2448
2449 if (err == 0) {
2450 err = -ENOBUFS;
af284937
DL		 2451 dev = __dev_get_by_name(net, p.name);
2452 if (!dev)
1da177e4
LT		 2453 goto err_exit;
2454 err = dev_open(dev);
2455 }
2456 }
0be669bb 2457#endif
1da177e4
LT		 2458
2459err_exit:
2460 rtnl_unlock();
2461 return err;
2462}
2463
2464/*
2465 * Manual configuration of address on an interface
2466 */
479840ff
JP		 2467static int inet6_addr_add(struct net *net, int ifindex,
2468 const struct in6_addr *pfx,
caeaba79 2469 const struct in6_addr *peer_pfx,
479840ff
JP		 2470 unsigned int plen, __u32 ifa_flags,
2471 __u32 prefered_lft, __u32 valid_lft)
1da177e4
LT		 2472{
2473 struct inet6_ifaddr *ifp;
2474 struct inet6_dev *idev;
2475 struct net_device *dev;
2476 int scope;
6f704992
YH		 2477 u32 flags;
2478 clock_t expires;
4bed72e4 2479 unsigned long timeout;
1da177e4
LT		 2480
2481 ASSERT_RTNL();
1ab1457c 2482
24ef0da7
TG		 2483 if (plen > 128)
2484 return -EINVAL;
2485
0778769d
NT		 2486 /* check the lifetime */
2487 if (!valid_lft || prefered_lft > valid_lft)
2488 return -EINVAL;
2489
53bd6749
JP		 2490 if (ifa_flags & IFA_F_MANAGETEMPADDR && plen != 64)
2491 return -EINVAL;
2492
af284937
DL		 2493 dev = __dev_get_by_index(net, ifindex);
2494 if (!dev)
1da177e4 2495 return -ENODEV;
1ab1457c 2496
64e724f6
BH		 2497 idev = addrconf_add_dev(dev);
2498 if (IS_ERR(idev))
2499 return PTR_ERR(idev);
1da177e4
LT		 2500
2501 scope = ipv6_addr_scope(pfx);
2502
4bed72e4
YH		 2503 timeout = addrconf_timeout_fixup(valid_lft, HZ);
2504 if (addrconf_finite_timeout(timeout)) {
2505 expires = jiffies_to_clock_t(timeout * HZ);
2506 valid_lft = timeout;
6f704992 2507 flags = RTF_EXPIRES;
4bed72e4
YH		 2508 } else {
2509 expires = 0;
2510 flags = 0;
2511 ifa_flags |= IFA_F_PERMANENT;
6f704992 2512 }
0778769d 2513
4bed72e4
YH		 2514 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
2515 if (addrconf_finite_timeout(timeout)) {
2516 if (timeout == 0)
2517 ifa_flags |= IFA_F_DEPRECATED;
2518 prefered_lft = timeout;
2519 }
0778769d 2520
8a226b2c
JB		 2521 ifp = ipv6_add_addr(idev, pfx, peer_pfx, plen, scope, ifa_flags,
2522 valid_lft, prefered_lft);
0778769d 2523
1da177e4 2524 if (!IS_ERR(ifp)) {
761aac73
TH		 2525 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) {
2526 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
2527 expires, flags);
2528 }
2529
95c385b4
NH		 2530 /*
2531 * Note that section 3.1 of RFC 4429 indicates
2532 * that the Optimistic flag should not be set for
2533 * manually configured addresses
2534 */
cf22f9a2 2535 addrconf_dad_start(ifp);
53bd6749
JP		 2536 if (ifa_flags & IFA_F_MANAGETEMPADDR)
2537 manage_tempaddrs(idev, ifp, valid_lft, prefered_lft,
2538 true, jiffies);
1da177e4 2539 in6_ifa_put(ifp);
c15b1cca 2540 addrconf_verify_rtnl();
1da177e4
LT		 2541 return 0;
2542 }
2543
2544 return PTR_ERR(ifp);
2545}
2546
6046d5b4
HK		 2547static int inet6_addr_del(struct net *net, int ifindex, u32 ifa_flags,
2548 const struct in6_addr *pfx, unsigned int plen)
1da177e4
LT		 2549{
2550 struct inet6_ifaddr *ifp;
2551 struct inet6_dev *idev;
2552 struct net_device *dev;
1ab1457c 2553
24ef0da7
TG		 2554 if (plen > 128)
2555 return -EINVAL;
2556
af284937
DL		 2557 dev = __dev_get_by_index(net, ifindex);
2558 if (!dev)
1da177e4
LT		 2559 return -ENODEV;
2560
e5d08d71
IM		 2561 idev = __in6_dev_get(dev);
2562 if (idev == NULL)
1da177e4
LT		 2563 return -ENXIO;
2564
2565 read_lock_bh(&idev->lock);
502a2ffd 2566 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1da177e4
LT		 2567 if (ifp->prefix_len == plen &&
2568 ipv6_addr_equal(pfx, &ifp->addr)) {
2569 in6_ifa_hold(ifp);
2570 read_unlock_bh(&idev->lock);
1ab1457c 2571
6046d5b4
HK		 2572 if (!(ifp->flags & IFA_F_TEMPORARY) &&
2573 (ifa_flags & IFA_F_MANAGETEMPADDR))
2574 manage_tempaddrs(idev, ifp, 0, 0, false,
2575 jiffies);
1da177e4 2576 ipv6_del_addr(ifp);
6046d5b4 2577 addrconf_verify_rtnl();
1da177e4
LT		 2578 return 0;
2579 }
2580 }
2581 read_unlock_bh(&idev->lock);
2582 return -EADDRNOTAVAIL;
2583}
2584
2585
af284937 2586int addrconf_add_ifaddr(struct net *net, void __user *arg)
1da177e4
LT		 2587{
2588 struct in6_ifreq ireq;
2589 int err;
1ab1457c 2590
af31f412 2591 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1da177e4 2592 return -EPERM;
1ab1457c 2593
1da177e4
LT		 2594 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2595 return -EFAULT;
2596
2597 rtnl_lock();
caeaba79 2598 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, NULL,
af284937
DL		 2599 ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2600 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
1da177e4
LT		 2601 rtnl_unlock();
2602 return err;
2603}
2604
af284937 2605int addrconf_del_ifaddr(struct net *net, void __user *arg)
1da177e4
LT		 2606{
2607 struct in6_ifreq ireq;
2608 int err;
1ab1457c 2609
af31f412 2610 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1da177e4
LT		 2611 return -EPERM;
2612
2613 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2614 return -EFAULT;
2615
2616 rtnl_lock();
6046d5b4 2617 err = inet6_addr_del(net, ireq.ifr6_ifindex, 0, &ireq.ifr6_addr,
af284937 2618 ireq.ifr6_prefixlen);
1da177e4
LT		 2619 rtnl_unlock();
2620 return err;
2621}
2622
b5f348e5
IJ		 2623static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
2624 int plen, int scope)
2625{
2626 struct inet6_ifaddr *ifp;
2627
8a226b2c 2628 ifp = ipv6_add_addr(idev, addr, NULL, plen,
07edd741
HFS		 2629 scope, IFA_F_PERMANENT,
2630 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
b5f348e5
IJ		 2631 if (!IS_ERR(ifp)) {
2632 spin_lock_bh(&ifp->lock);
2633 ifp->flags &= ~IFA_F_TENTATIVE;
2634 spin_unlock_bh(&ifp->lock);
2635 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2636 in6_ifa_put(ifp);
2637 }
2638}
2639
07a93626 2640#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4
LT		 2641static void sit_add_v4_addrs(struct inet6_dev *idev)
2642{
1da177e4
LT		 2643 struct in6_addr addr;
2644 struct net_device *dev;
c346dca1 2645 struct net *net = dev_net(idev->dev);
929c9cf3 2646 int scope, plen;
f0e2acfa 2647 u32 pflags = 0;
1da177e4
LT		 2648
2649 ASSERT_RTNL();
2650
2651 memset(&addr, 0, sizeof(struct in6_addr));
2652 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2653
2654 if (idev->dev->flags&IFF_POINTOPOINT) {
2655 addr.s6_addr32[0] = htonl(0xfe800000);
2656 scope = IFA_LINK;
929c9cf3 2657 plen = 64;
1da177e4
LT		 2658 } else {
2659 scope = IPV6_ADDR_COMPATv4;
929c9cf3 2660 plen = 96;
f0e2acfa 2661 pflags |= RTF_NONEXTHOP;
1da177e4
LT		 2662 }
2663
2664 if (addr.s6_addr32[3]) {
929c9cf3 2665 add_addr(idev, &addr, plen, scope);
f0e2acfa 2666 addrconf_prefix_route(&addr, plen, idev->dev, 0, pflags);
1da177e4
LT		 2667 return;
2668 }
2669
6fda7350 2670 for_each_netdev(net, dev) {
8e5e8f30 2671 struct in_device *in_dev = __in_dev_get_rtnl(dev);
1da177e4 2672 if (in_dev && (dev->flags & IFF_UP)) {
8e5e8f30 2673 struct in_ifaddr *ifa;
1da177e4
LT		 2674
2675 int flag = scope;
2676
2677 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
1da177e4
LT		 2678
2679 addr.s6_addr32[3] = ifa->ifa_local;
2680
2681 if (ifa->ifa_scope == RT_SCOPE_LINK)
2682 continue;
2683 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2684 if (idev->dev->flags&IFF_POINTOPOINT)
2685 continue;
2686 flag |= IFA_HOST;
2687 }
1da177e4 2688
b5f348e5 2689 add_addr(idev, &addr, plen, flag);
f0e2acfa
ND		 2690 addrconf_prefix_route(&addr, plen, idev->dev, 0,
2691 pflags);
1da177e4
LT		 2692 }
2693 }
1ab1457c 2694 }
1da177e4 2695}
0be669bb 2696#endif
1da177e4
LT		 2697
2698static void init_loopback(struct net_device *dev)
2699{
2700 struct inet6_dev *idev;
25fb6ca4
BK		 2701 struct net_device *sp_dev;
2702 struct inet6_ifaddr *sp_ifa;
2703 struct rt6_info *sp_rt;
1da177e4
LT		 2704
2705 /* ::1 */
2706
2707 ASSERT_RTNL();
2708
e5d08d71
IM		 2709 idev = ipv6_find_idev(dev);
2710 if (idev == NULL) {
91df42be 2711 pr_debug("%s: add_dev failed\n", __func__);
1da177e4
LT		 2712 return;
2713 }
2714
b5f348e5 2715 add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
25fb6ca4
BK		 2716
2717 /* Add routes to other interface's IPv6 addresses */
2718 for_each_netdev(dev_net(dev), sp_dev) {
2719 if (!strcmp(sp_dev->name, dev->name))
2720 continue;
2721
2722 idev = __in6_dev_get(sp_dev);
2723 if (!idev)
2724 continue;
2725
2726 read_lock_bh(&idev->lock);
2727 list_for_each_entry(sp_ifa, &idev->addr_list, if_list) {
2728
2729 if (sp_ifa->flags & (IFA_F_DADFAILED | IFA_F_TENTATIVE))
2730 continue;
2731
33d99113
G		 2732 if (sp_ifa->rt) {
2733 /* This dst has been added to garbage list when
2734 * lo device down, release this obsolete dst and
2735 * reallocate a new router for ifa.
2736 */
2737 if (sp_ifa->rt->dst.obsolete > 0) {
2738 ip6_rt_put(sp_ifa->rt);
2739 sp_ifa->rt = NULL;
2740 } else {
2741 continue;
2742 }
2743 }
a881ae1f 2744
57ec0afe 2745 sp_rt = addrconf_dst_alloc(idev, &sp_ifa->addr, false);
25fb6ca4
BK		 2746
2747 /* Failure cases are ignored */
534c8779
G		 2748 if (!IS_ERR(sp_rt)) {
2749 sp_ifa->rt = sp_rt;
25fb6ca4 2750 ip6_ins_rt(sp_rt);
534c8779 2751 }
25fb6ca4
BK		 2752 }
2753 read_unlock_bh(&idev->lock);
2754 }
1da177e4
LT		 2755}
2756
b71d1d42 2757static void addrconf_add_linklocal(struct inet6_dev *idev, const struct in6_addr *addr)
1da177e4 2758{
8e5e8f30 2759 struct inet6_ifaddr *ifp;
95c385b4
NH		 2760 u32 addr_flags = IFA_F_PERMANENT;
2761
2762#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2763 if (idev->cnf.optimistic_dad &&
702beb87 2764 !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
95c385b4
NH		 2765 addr_flags |= IFA_F_OPTIMISTIC;
2766#endif
1da177e4 2767
95c385b4 2768
07edd741
HFS		 2769 ifp = ipv6_add_addr(idev, addr, NULL, 64, IFA_LINK, addr_flags,
2770 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
1da177e4 2771 if (!IS_ERR(ifp)) {
46d48046 2772 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
cf22f9a2 2773 addrconf_dad_start(ifp);
1da177e4
LT		 2774 in6_ifa_put(ifp);
2775 }
2776}
2777
bc91b0f0
JP		 2778static void addrconf_addr_gen(struct inet6_dev *idev, bool prefix_route)
2779{
2780 if (idev->addr_gen_mode == IN6_ADDR_GEN_MODE_EUI64) {
2781 struct in6_addr addr;
2782
2783 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
2784 /* addrconf_add_linklocal also adds a prefix_route and we
2785 * only need to care about prefix routes if ipv6_generate_eui64
2786 * couldn't generate one.
2787 */
2788 if (ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) == 0)
2789 addrconf_add_linklocal(idev, &addr);
2790 else if (prefix_route)
2791 addrconf_prefix_route(&addr, 64, idev->dev, 0, 0);
2792 }
2793}
2794
1da177e4
LT		 2795static void addrconf_dev_config(struct net_device *dev)
2796{
8e5e8f30 2797 struct inet6_dev *idev;
1da177e4
LT		 2798
2799 ASSERT_RTNL();
2800
74235a25
HX		 2801 if ((dev->type != ARPHRD_ETHER) &&
2802 (dev->type != ARPHRD_FDDI) &&
74235a25 2803 (dev->type != ARPHRD_ARCNET) &&
06a4c1c5 2804 (dev->type != ARPHRD_INFINIBAND) &&
cb6bf355 2805 (dev->type != ARPHRD_IEEE802154) &&
e837735e 2806 (dev->type != ARPHRD_IEEE1394) &&
e74bccb8
JR		 2807 (dev->type != ARPHRD_TUNNEL6) &&
2808 (dev->type != ARPHRD_6LOWPAN)) {
74235a25
HX		 2809 /* Alas, we support only Ethernet autoconfiguration. */
2810 return;
2811 }
2812
1da177e4 2813 idev = addrconf_add_dev(dev);
64e724f6 2814 if (IS_ERR(idev))
1da177e4
LT		 2815 return;
2816
bc91b0f0 2817 addrconf_addr_gen(idev, false);
1da177e4
LT		 2818}
2819
07a93626 2820#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4
LT		 2821static void addrconf_sit_config(struct net_device *dev)
2822{
2823 struct inet6_dev *idev;
2824
2825 ASSERT_RTNL();
2826
1ab1457c
YH		 2827 /*
2828 * Configure the tunnel with one of our IPv4
2829 * addresses... we should configure all of
1da177e4
LT		 2830 * our v4 addrs in the tunnel
2831 */
2832
e5d08d71
IM		 2833 idev = ipv6_find_idev(dev);
2834 if (idev == NULL) {
91df42be 2835 pr_debug("%s: add_dev failed\n", __func__);
1da177e4
LT		 2836 return;
2837 }
2838
c7dc89c0 2839 if (dev->priv_flags & IFF_ISATAP) {
bc91b0f0 2840 addrconf_addr_gen(idev, false);
c7dc89c0
FT		 2841 return;
2842 }
2843
1da177e4
LT		 2844 sit_add_v4_addrs(idev);
2845
62b54dd9 2846 if (dev->flags&IFF_POINTOPOINT)
1da177e4 2847 addrconf_add_mroute(dev);
1da177e4 2848}
0be669bb 2849#endif
1da177e4 2850
07a93626 2851#if IS_ENABLED(CONFIG_NET_IPGRE)
aee80b54 2852static void addrconf_gre_config(struct net_device *dev)
2853{
2854 struct inet6_dev *idev;
aee80b54 2855
aee80b54 2856 ASSERT_RTNL();
2857
e5d08d71
IM		 2858 idev = ipv6_find_idev(dev);
2859 if (idev == NULL) {
91df42be 2860 pr_debug("%s: add_dev failed\n", __func__);
aee80b54 2861 return;
2862 }
2863
bc91b0f0 2864 addrconf_addr_gen(idev, true);
aee80b54 2865}
2866#endif
2867
1ab1457c 2868static int addrconf_notify(struct notifier_block *this, unsigned long event,
351638e7 2869 void *ptr)
1da177e4 2870{
351638e7 2871 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
748e2d93 2872 struct inet6_dev *idev = __in6_dev_get(dev);
c5e33bdd 2873 int run_pending = 0;
b217d616 2874 int err;
1da177e4 2875
e21e8467 2876 switch (event) {
45ba9dd2 2877 case NETDEV_REGISTER:
74235a25 2878 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
45ba9dd2 2879 idev = ipv6_add_dev(dev);
a317a2f1
WC		 2880 if (IS_ERR(idev))
2881 return notifier_from_errno(PTR_ERR(idev));
45ba9dd2
YH		 2882 }
2883 break;
bcdd553f 2884
1da177e4 2885 case NETDEV_UP:
3c21edbd 2886 case NETDEV_CHANGE:
c2edacf8
JV		 2887 if (dev->flags & IFF_SLAVE)
2888 break;
2889
3ce62a84
WC		 2890 if (idev && idev->cnf.disable_ipv6)
2891 break;
2892
3c21edbd 2893 if (event == NETDEV_UP) {
f24e3d65 2894 if (!addrconf_qdisc_ok(dev)) {
3c21edbd 2895 /* device is not ready yet. */
f3213831 2896 pr_info("ADDRCONF(NETDEV_UP): %s: link is not ready\n",
3c21edbd
YH		 2897 dev->name);
2898 break;
2899 }
99081049 2900
d31c7b8f
EP		 2901 if (!idev && dev->mtu >= IPV6_MIN_MTU)
2902 idev = ipv6_add_dev(dev);
2903
a317a2f1 2904 if (!IS_ERR_OR_NULL(idev)) {
99081049 2905 idev->if_flags |= IF_READY;
e3ec6cfc
BT		 2906 run_pending = 1;
2907 }
3c21edbd 2908 } else {
f24e3d65 2909 if (!addrconf_qdisc_ok(dev)) {
3c21edbd
YH		 2910 /* device is still not ready. */
2911 break;
2912 }
2913
2914 if (idev) {
bcdd553f 2915 if (idev->if_flags & IF_READY)
3c21edbd
YH		 2916 /* device is already configured. */
2917 break;
3c21edbd
YH		 2918 idev->if_flags |= IF_READY;
2919 }
2920
f3213831
JP		 2921 pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n",
2922 dev->name);
3c21edbd 2923
c5e33bdd 2924 run_pending = 1;
3c21edbd
YH		 2925 }
2926
e21e8467 2927 switch (dev->type) {
07a93626 2928#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4
LT		 2929 case ARPHRD_SIT:
2930 addrconf_sit_config(dev);
2931 break;
aee80b54 2932#endif
07a93626 2933#if IS_ENABLED(CONFIG_NET_IPGRE)
aee80b54 2934 case ARPHRD_IPGRE:
2935 addrconf_gre_config(dev);
2936 break;
0be669bb 2937#endif
1da177e4
LT		 2938 case ARPHRD_LOOPBACK:
2939 init_loopback(dev);
2940 break;
2941
2942 default:
2943 addrconf_dev_config(dev);
2944 break;
3ff50b79 2945 }
bcdd553f 2946
a317a2f1 2947 if (!IS_ERR_OR_NULL(idev)) {
c5e33bdd
YH		 2948 if (run_pending)
2949 addrconf_dad_run(idev);
2950
bcdd553f
SH		 2951 /*
2952 * If the MTU changed during the interface down,
2953 * when the interface up, the changed MTU must be
2954 * reflected in the idev as well as routers.
1da177e4 2955 */
bcdd553f
SH		 2956 if (idev->cnf.mtu6 != dev->mtu &&
2957 dev->mtu >= IPV6_MIN_MTU) {
1da177e4
LT		 2958 rt6_mtu_change(dev, dev->mtu);
2959 idev->cnf.mtu6 = dev->mtu;
2960 }
2961 idev->tstamp = jiffies;
2962 inet6_ifinfo_notify(RTM_NEWLINK, idev);
bcdd553f
SH		 2963
2964 /*
2965 * If the changed mtu during down is lower than
2966 * IPV6_MIN_MTU stop IPv6 on this interface.
1da177e4
LT		 2967 */
2968 if (dev->mtu < IPV6_MIN_MTU)
bcdd553f 2969 addrconf_ifdown(dev, 1);
1da177e4
LT		 2970 }
2971 break;
2972
2973 case NETDEV_CHANGEMTU:
d31c7b8f 2974 if (idev && dev->mtu >= IPV6_MIN_MTU) {
1da177e4
LT		 2975 rt6_mtu_change(dev, dev->mtu);
2976 idev->cnf.mtu6 = dev->mtu;
2977 break;
2978 }
2979
d31c7b8f
EP		 2980 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2981 idev = ipv6_add_dev(dev);
a317a2f1 2982 if (!IS_ERR(idev))
d31c7b8f
EP		 2983 break;
2984 }
2985
bcdd553f 2986 /*
db9c7c39 2987 * if MTU under IPV6_MIN_MTU.
bcdd553f
SH		 2988 * Stop IPv6 on this interface.
2989 */
1da177e4
LT		 2990
2991 case NETDEV_DOWN:
2992 case NETDEV_UNREGISTER:
2993 /*
2994 * Remove all addresses from this interface.
2995 */
2996 addrconf_ifdown(dev, event != NETDEV_DOWN);
2997 break;
3c21edbd 2998
1da177e4 2999 case NETDEV_CHANGENAME:
1da177e4 3000 if (idev) {
5632c515 3001 snmp6_unregister_dev(idev);
408c4768 3002 addrconf_sysctl_unregister(idev);
a317a2f1 3003 err = addrconf_sysctl_register(idev);
b217d616
HX		 3004 if (err)
3005 return notifier_from_errno(err);
a317a2f1
WC		 3006 err = snmp6_register_dev(idev);
3007 if (err) {
3008 addrconf_sysctl_unregister(idev);
3009 return notifier_from_errno(err);
3010 }
5632c515 3011 }
1da177e4 3012 break;
bcdd553f 3013
93d9b7d7
JP		 3014 case NETDEV_PRE_TYPE_CHANGE:
3015 case NETDEV_POST_TYPE_CHANGE:
3016 addrconf_type_change(dev, event);
75c78500 3017 break;
3ff50b79 3018 }
1da177e4
LT		 3019
3020 return NOTIFY_OK;
3021}
3022
3023/*
3024 * addrconf module should be notified of a device going up
3025 */
3026static struct notifier_block ipv6_dev_notf = {
3027 .notifier_call = addrconf_notify,
1da177e4
LT		 3028};
3029
93d9b7d7 3030static void addrconf_type_change(struct net_device *dev, unsigned long event)
75c78500
MS		 3031{
3032 struct inet6_dev *idev;
3033 ASSERT_RTNL();
3034
3035 idev = __in6_dev_get(dev);
3036
93d9b7d7 3037 if (event == NETDEV_POST_TYPE_CHANGE)
75c78500 3038 ipv6_mc_remap(idev);
93d9b7d7 3039 else if (event == NETDEV_PRE_TYPE_CHANGE)
75c78500
MS		 3040 ipv6_mc_unmap(idev);
3041}
3042
1da177e4
LT		 3043static int addrconf_ifdown(struct net_device *dev, int how)
3044{
c346dca1 3045 struct net *net = dev_net(dev);
502a2ffd 3046 struct inet6_dev *idev;
3047 struct inet6_ifaddr *ifa;
73a8bd74 3048 int state, i;
1da177e4
LT		 3049
3050 ASSERT_RTNL();
3051
73a8bd74
DM		 3052 rt6_ifdown(net, dev);
3053 neigh_ifdown(&nd_tbl, dev);
1da177e4
LT		 3054
3055 idev = __in6_dev_get(dev);
3056 if (idev == NULL)
3057 return -ENODEV;
3058
bcdd553f
SH		 3059 /*
3060 * Step 1: remove reference to ipv6 device from parent device.
3061 * Do not dev_put!
1da177e4 3062 */
439e2385 3063 if (how) {
1da177e4 3064 idev->dead = 1;
8814c4b5
YH		 3065
3066 /* protected by rtnl_lock */
a9b3cd7f 3067 RCU_INIT_POINTER(dev->ip6_ptr, NULL);
1da177e4
LT		 3068
3069 /* Step 1.5: remove snmp6 entry */
3070 snmp6_unregister_dev(idev);
3071
3072 }
3073
73a8bd74
DM		 3074 /* Step 2: clear hash table */
3075 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3076 struct hlist_head *h = &inet6_addr_lst[i];
73a8bd74
DM		 3077
3078 spin_lock_bh(&addrconf_hash_lock);
67ba4152 3079restart:
b67bfe0d 3080 hlist_for_each_entry_rcu(ifa, h, addr_lst) {
73a8bd74
DM		 3081 if (ifa->idev == idev) {
3082 hlist_del_init_rcu(&ifa->addr_lst);
c15b1cca 3083 addrconf_del_dad_work(ifa);
73a8bd74
DM		 3084 goto restart;
3085 }
3086 }
3087 spin_unlock_bh(&addrconf_hash_lock);
3088 }
3089
1da177e4
LT		 3090 write_lock_bh(&idev->lock);
3091
b7b1bfce
HFS		 3092 addrconf_del_rs_timer(idev);
3093
bcdd553f 3094 /* Step 2: clear flags for stateless addrconf */
439e2385 3095 if (!how)
3c21edbd 3096 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
1da177e4 3097
439e2385 3098 if (how && del_timer(&idev->regen_timer))
1da177e4
LT		 3099 in6_dev_put(idev);
3100
bcdd553f 3101 /* Step 3: clear tempaddr list */
372e6c8f 3102 while (!list_empty(&idev->tempaddr_list)) {
3103 ifa = list_first_entry(&idev->tempaddr_list,
3104 struct inet6_ifaddr, tmp_list);
3105 list_del(&ifa->tmp_list);
1da177e4
LT		 3106 write_unlock_bh(&idev->lock);
3107 spin_lock_bh(&ifa->lock);
3108
3109 if (ifa->ifpub) {
3110 in6_ifa_put(ifa->ifpub);
3111 ifa->ifpub = NULL;
3112 }
3113 spin_unlock_bh(&ifa->lock);
3114 in6_ifa_put(ifa);
3115 write_lock_bh(&idev->lock);
3116 }
8f37ada5 3117
502a2ffd 3118 while (!list_empty(&idev->addr_list)) {
3119 ifa = list_first_entry(&idev->addr_list,
3120 struct inet6_ifaddr, if_list);
c15b1cca 3121 addrconf_del_dad_work(ifa);
84e8b803 3122
73a8bd74 3123 list_del(&ifa->if_list);
84e8b803 3124
73a8bd74 3125 write_unlock_bh(&idev->lock);
84e8b803 3126
73a8bd74
DM		 3127 spin_lock_bh(&ifa->state_lock);
3128 state = ifa->state;
3129 ifa->state = INET6_IFADDR_STATE_DEAD;
3130 spin_unlock_bh(&ifa->state_lock);
9d82ca98 3131
73a8bd74
DM		 3132 if (state != INET6_IFADDR_STATE_DEAD) {
3133 __ipv6_ifa_notify(RTM_DELADDR, ifa);
f88c91dd 3134 inet6addr_notifier_call_chain(NETDEV_DOWN, ifa);
27bdb2ab 3135 }
73a8bd74 3136 in6_ifa_put(ifa);
8f37ada5 3137
73a8bd74
DM		 3138 write_lock_bh(&idev->lock);
3139 }
8f37ada5 3140
1da177e4
LT		 3141 write_unlock_bh(&idev->lock);
3142
381f4dca
SD		 3143 /* Step 5: Discard anycast and multicast list */
3144 if (how) {
3145 ipv6_ac_destroy_dev(idev);
1da177e4 3146 ipv6_mc_destroy_dev(idev);
381f4dca 3147 } else {
1da177e4 3148 ipv6_mc_down(idev);
381f4dca 3149 }
1da177e4 3150
1da177e4 3151 idev->tstamp = jiffies;
1ab1457c 3152
bcdd553f 3153 /* Last: Shot the device (if unregistered) */
439e2385 3154 if (how) {
408c4768 3155 addrconf_sysctl_unregister(idev);
1da177e4
LT		 3156 neigh_parms_release(&nd_tbl, idev->nd_parms);
3157 neigh_ifdown(&nd_tbl, dev);
3158 in6_dev_put(idev);
3159 }
3160 return 0;
3161}
3162
3163static void addrconf_rs_timer(unsigned long data)
3164{
b7b1bfce 3165 struct inet6_dev *idev = (struct inet6_dev *)data;
caf92bc4 3166 struct net_device *dev = idev->dev;
b7b1bfce 3167 struct in6_addr lladdr;
1da177e4 3168
b7b1bfce 3169 write_lock(&idev->lock);
5b2a1953 3170 if (idev->dead || !(idev->if_flags & IF_READY))
1da177e4
LT		 3171 goto out;
3172
9ba2add3 3173 if (!ipv6_accept_ra(idev))
5b2a1953 3174 goto out;
3175
3176 /* Announcement received after solicitation was sent */
3177 if (idev->if_flags & IF_RA_RCVD)
1da177e4 3178 goto out;
1da177e4 3179
b7b1bfce 3180 if (idev->rs_probes++ < idev->cnf.rtr_solicits) {
caf92bc4
CW		 3181 write_unlock(&idev->lock);
3182 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
3183 ndisc_send_rs(dev, &lladdr,
b7b1bfce
HFS		 3184 &in6addr_linklocal_allrouters);
3185 else
caf92bc4 3186 goto put;
1da177e4 3187
caf92bc4 3188 write_lock(&idev->lock);
b7b1bfce
HFS		 3189 /* The wait after the last probe can be shorter */
3190 addrconf_mod_rs_timer(idev, (idev->rs_probes ==
3191 idev->cnf.rtr_solicits) ?
3192 idev->cnf.rtr_solicit_delay :
3193 idev->cnf.rtr_solicit_interval);
1da177e4 3194 } else {
1da177e4
LT		 3195 /*
3196 * Note: we do not support deprecated "all on-link"
3197 * assumption any longer.
3198 */
91df42be 3199 pr_debug("%s: no IPv6 routers present\n", idev->dev->name);
1da177e4
LT		 3200 }
3201
3202out:
b7b1bfce 3203 write_unlock(&idev->lock);
caf92bc4 3204put:
b7b1bfce 3205 in6_dev_put(idev);
1da177e4
LT		 3206}
3207
3208/*
3209 * Duplicate Address Detection
3210 */
3c21edbd
YH		 3211static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
3212{
3213 unsigned long rand_num;
3214 struct inet6_dev *idev = ifp->idev;
3215
95c385b4
NH		 3216 if (ifp->flags & IFA_F_OPTIMISTIC)
3217 rand_num = 0;
3218 else
63862b5b 3219 rand_num = prandom_u32() % (idev->cnf.rtr_solicit_delay ? : 1);
95c385b4 3220
b7b1bfce 3221 ifp->dad_probes = idev->cnf.dad_transmits;
c15b1cca 3222 addrconf_mod_dad_work(ifp, rand_num);
3c21edbd
YH		 3223}
3224
c15b1cca 3225static void addrconf_dad_begin(struct inet6_ifaddr *ifp)
1da177e4
LT		 3226{
3227 struct inet6_dev *idev = ifp->idev;
3228 struct net_device *dev = idev->dev;
1da177e4
LT		 3229
3230 addrconf_join_solict(dev, &ifp->addr);
3231
63862b5b 3232 prandom_seed((__force u32) ifp->addr.s6_addr32[3]);
1da177e4
LT		 3233
3234 read_lock_bh(&idev->lock);
622ccdf1 3235 spin_lock(&ifp->lock);
e9d3e084 3236 if (ifp->state == INET6_IFADDR_STATE_DEAD)
1da177e4 3237 goto out;
1da177e4
LT		 3238
3239 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
1b34be74 3240 idev->cnf.accept_dad < 1 ||
55ebaef1
NT		 3241 !(ifp->flags&IFA_F_TENTATIVE) ||
3242 ifp->flags & IFA_F_NODAD) {
cc411d0b 3243 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
21809faf 3244 spin_unlock(&ifp->lock);
1da177e4
LT		 3245 read_unlock_bh(&idev->lock);
3246
3247 addrconf_dad_completed(ifp);
3248 return;
3249 }
3250
6732bade 3251 if (!(idev->if_flags & IF_READY)) {
21809faf 3252 spin_unlock(&ifp->lock);
6732bade 3253 read_unlock_bh(&idev->lock);
3c21edbd 3254 /*
590a9887 3255 * If the device is not ready:
3c21edbd
YH		 3256 * - keep it tentative if it is a permanent address.
3257 * - otherwise, kill it.
3258 */
3259 in6_ifa_hold(ifp);
cc411d0b 3260 addrconf_dad_stop(ifp, 0);
6732bade 3261 return;
3c21edbd 3262 }
95c385b4
NH		 3263
3264 /*
3265 * Optimistic nodes can start receiving
3266 * Frames right away
3267 */
7fd2561e 3268 if (ifp->flags & IFA_F_OPTIMISTIC) {
95c385b4 3269 ip6_ins_rt(ifp->rt);
7fd2561e
EK		 3270 if (ipv6_use_optimistic_addr(idev)) {
3271 /* Because optimistic nodes can use this address,
3272 * notify listeners. If DAD fails, RTM_DELADDR is sent.
3273 */
3274 ipv6_ifa_notify(RTM_NEWADDR, ifp);
3275 }
3276 }
95c385b4 3277
6732bade 3278 addrconf_dad_kick(ifp);
1da177e4 3279out:
622ccdf1 3280 spin_unlock(&ifp->lock);
1da177e4
LT		 3281 read_unlock_bh(&idev->lock);
3282}
3283
c15b1cca 3284static void addrconf_dad_start(struct inet6_ifaddr *ifp)
1da177e4 3285{
c15b1cca
HFS		 3286 bool begin_dad = false;
3287
3288 spin_lock_bh(&ifp->state_lock);
3289 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
3290 ifp->state = INET6_IFADDR_STATE_PREDAD;
3291 begin_dad = true;
3292 }
3293 spin_unlock_bh(&ifp->state_lock);
3294
3295 if (begin_dad)
3296 addrconf_mod_dad_work(ifp, 0);
3297}
3298
3299static void addrconf_dad_work(struct work_struct *w)
3300{
3301 struct inet6_ifaddr *ifp = container_of(to_delayed_work(w),
3302 struct inet6_ifaddr,
3303 dad_work);
1da177e4 3304 struct inet6_dev *idev = ifp->idev;
1da177e4
LT		 3305 struct in6_addr mcaddr;
3306
c15b1cca
HFS		 3307 enum {
3308 DAD_PROCESS,
3309 DAD_BEGIN,
3310 DAD_ABORT,
3311 } action = DAD_PROCESS;
3312
3313 rtnl_lock();
3314
3315 spin_lock_bh(&ifp->state_lock);
3316 if (ifp->state == INET6_IFADDR_STATE_PREDAD) {
3317 action = DAD_BEGIN;
3318 ifp->state = INET6_IFADDR_STATE_DAD;
3319 } else if (ifp->state == INET6_IFADDR_STATE_ERRDAD) {
3320 action = DAD_ABORT;
3321 ifp->state = INET6_IFADDR_STATE_POSTDAD;
3322 }
3323 spin_unlock_bh(&ifp->state_lock);
3324
3325 if (action == DAD_BEGIN) {
3326 addrconf_dad_begin(ifp);
3327 goto out;
3328 } else if (action == DAD_ABORT) {
3329 addrconf_dad_stop(ifp, 1);
3330 goto out;
3331 }
3332
b7b1bfce 3333 if (!ifp->dad_probes && addrconf_dad_end(ifp))
f2344a13
HX		 3334 goto out;
3335
c15b1cca 3336 write_lock_bh(&idev->lock);
122e4519 3337 if (idev->dead || !(idev->if_flags & IF_READY)) {
c15b1cca 3338 write_unlock_bh(&idev->lock);
1da177e4
LT		 3339 goto out;
3340 }
21809faf 3341
3342 spin_lock(&ifp->lock);
622ccdf1
HX		 3343 if (ifp->state == INET6_IFADDR_STATE_DEAD) {
3344 spin_unlock(&ifp->lock);
c15b1cca 3345 write_unlock_bh(&idev->lock);
622ccdf1
HX		 3346 goto out;
3347 }
3348
b7b1bfce 3349 if (ifp->dad_probes == 0) {
1da177e4
LT		 3350 /*
3351 * DAD was successful
3352 */
3353
cc411d0b 3354 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
21809faf 3355 spin_unlock(&ifp->lock);
c15b1cca 3356 write_unlock_bh(&idev->lock);
1da177e4
LT		 3357
3358 addrconf_dad_completed(ifp);
3359
3360 goto out;
3361 }
3362
b7b1bfce 3363 ifp->dad_probes--;
c15b1cca
HFS		 3364 addrconf_mod_dad_work(ifp,
3365 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME));
21809faf 3366 spin_unlock(&ifp->lock);
c15b1cca 3367 write_unlock_bh(&idev->lock);
1da177e4
LT		 3368
3369 /* send a neighbour solicitation for our addr */
1da177e4 3370 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
d7aabf22 3371 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &in6addr_any);
1da177e4
LT		 3372out:
3373 in6_ifa_put(ifp);
c15b1cca 3374 rtnl_unlock();
1da177e4
LT		 3375}
3376
11ffff75
HFS		 3377/* ifp->idev must be at least read locked */
3378static bool ipv6_lonely_lladdr(struct inet6_ifaddr *ifp)
3379{
3380 struct inet6_ifaddr *ifpiter;
3381 struct inet6_dev *idev = ifp->idev;
3382
602582ca
HFS		 3383 list_for_each_entry_reverse(ifpiter, &idev->addr_list, if_list) {
3384 if (ifpiter->scope > IFA_LINK)
3385 break;
11ffff75
HFS		 3386 if (ifp != ifpiter && ifpiter->scope == IFA_LINK &&
3387 (ifpiter->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE|
3388 IFA_F_OPTIMISTIC|IFA_F_DADFAILED)) ==
3389 IFA_F_PERMANENT)
3390 return false;
3391 }
3392 return true;
3393}
3394
1da177e4
LT		 3395static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
3396{
e21e8467 3397 struct net_device *dev = ifp->idev->dev;
b7b1bfce 3398 struct in6_addr lladdr;
b173ee48 3399 bool send_rs, send_mld;
b7b1bfce 3400
c15b1cca 3401 addrconf_del_dad_work(ifp);
1da177e4
LT		 3402
3403 /*
3404 * Configure the address for reception. Now it is valid.
3405 */
3406
3407 ipv6_ifa_notify(RTM_NEWADDR, ifp);
3408
026359bc
TA		 3409 /* If added prefix is link local and we are prepared to process
3410 router advertisements, start sending router solicitations.
1da177e4
LT		 3411 */
3412
1ec047eb 3413 read_lock_bh(&ifp->idev->lock);
11ffff75 3414 send_mld = ifp->scope == IFA_LINK && ipv6_lonely_lladdr(ifp);
b173ee48
HFS		 3415 send_rs = send_mld &&
3416 ipv6_accept_ra(ifp->idev) &&
1ec047eb 3417 ifp->idev->cnf.rtr_solicits > 0 &&
b173ee48 3418 (dev->flags&IFF_LOOPBACK) == 0;
1ec047eb
HFS		 3419 read_unlock_bh(&ifp->idev->lock);
3420
b173ee48
HFS		 3421 /* While dad is in progress mld report's source address is in6_addrany.
3422 * Resend with proper ll now.
3423 */
3424 if (send_mld)
3425 ipv6_mc_dad_complete(ifp->idev);
3426
1ec047eb 3427 if (send_rs) {
1da177e4
LT		 3428 /*
3429 * If a host as already performed a random delay
3430 * [...] as part of DAD [...] there is no need
3431 * to delay again before sending the first RS
3432 */
1ec047eb 3433 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
b7b1bfce 3434 return;
1ec047eb 3435 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters);
1da177e4 3436
b7b1bfce
HFS		 3437 write_lock_bh(&ifp->idev->lock);
3438 spin_lock(&ifp->lock);
3439 ifp->idev->rs_probes = 1;
1da177e4 3440 ifp->idev->if_flags |= IF_RS_SENT;
b7b1bfce
HFS		 3441 addrconf_mod_rs_timer(ifp->idev,
3442 ifp->idev->cnf.rtr_solicit_interval);
3443 spin_unlock(&ifp->lock);
3444 write_unlock_bh(&ifp->idev->lock);
1da177e4
LT		 3445 }
3446}
3447
e21e8467
SH		 3448static void addrconf_dad_run(struct inet6_dev *idev)
3449{
c5e33bdd
YH		 3450 struct inet6_ifaddr *ifp;
3451
3452 read_lock_bh(&idev->lock);
502a2ffd 3453 list_for_each_entry(ifp, &idev->addr_list, if_list) {
21809faf 3454 spin_lock(&ifp->lock);
f2344a13
HX		 3455 if (ifp->flags & IFA_F_TENTATIVE &&
3456 ifp->state == INET6_IFADDR_STATE_DAD)
3457 addrconf_dad_kick(ifp);
21809faf 3458 spin_unlock(&ifp->lock);
c5e33bdd
YH		 3459 }
3460 read_unlock_bh(&idev->lock);
3461}
3462
1da177e4
LT		 3463#ifdef CONFIG_PROC_FS
3464struct if6_iter_state {
3c40090a 3465 struct seq_net_private p;
1da177e4 3466 int bucket;
1d578303 3467 int offset;
1da177e4
LT		 3468};
3469
1d578303 3470static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos)
1da177e4
LT		 3471{
3472 struct inet6_ifaddr *ifa = NULL;
3473 struct if6_iter_state *state = seq->private;
1218854a 3474 struct net *net = seq_file_net(seq);
1d578303 3475 int p = 0;
1da177e4 3476
1d578303
MM		 3477 /* initial bucket if pos is 0 */
3478 if (pos == 0) {
3479 state->bucket = 0;
3480 state->offset = 0;
3481 }
3482
3483 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
b67bfe0d 3484 hlist_for_each_entry_rcu_bh(ifa, &inet6_addr_lst[state->bucket],
1d578303 3485 addr_lst) {
9f0d3c27
ED		 3486 if (!net_eq(dev_net(ifa->idev->dev), net))
3487 continue;
1d578303
MM		 3488 /* sync with offset */
3489 if (p < state->offset) {
3490 p++;
3491 continue;
3492 }
3493 state->offset++;
9f0d3c27 3494 return ifa;
1d578303
MM		 3495 }
3496
3497 /* prepare for next bucket */
3498 state->offset = 0;
3499 p = 0;
1da177e4 3500 }
c2e21293 3501 return NULL;
1da177e4
LT		 3502}
3503
c2e21293 3504static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
3505 struct inet6_ifaddr *ifa)
1da177e4
LT		 3506{
3507 struct if6_iter_state *state = seq->private;
1218854a 3508 struct net *net = seq_file_net(seq);
1da177e4 3509
b67bfe0d 3510 hlist_for_each_entry_continue_rcu_bh(ifa, addr_lst) {
9f0d3c27
ED		 3511 if (!net_eq(dev_net(ifa->idev->dev), net))
3512 continue;
1d578303 3513 state->offset++;
9f0d3c27 3514 return ifa;
1d578303 3515 }
3c40090a 3516
c2e21293 3517 while (++state->bucket < IN6_ADDR_HSIZE) {
1d578303 3518 state->offset = 0;
b67bfe0d 3519 hlist_for_each_entry_rcu_bh(ifa,
c2e21293 3520 &inet6_addr_lst[state->bucket], addr_lst) {
9f0d3c27
ED		 3521 if (!net_eq(dev_net(ifa->idev->dev), net))
3522 continue;
1d578303 3523 state->offset++;
9f0d3c27 3524 return ifa;
c2e21293 3525 }
1da177e4 3526 }
3c40090a 3527
c2e21293 3528 return NULL;
1da177e4
LT		 3529}
3530
1da177e4 3531static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
4f70ecca 3532 __acquires(rcu_bh)
1da177e4 3533{
5c578aed 3534 rcu_read_lock_bh();
1d578303 3535 return if6_get_first(seq, *pos);
1da177e4
LT		 3536}
3537
3538static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3539{
3540 struct inet6_ifaddr *ifa;
3541
3542 ifa = if6_get_next(seq, v);
3543 ++*pos;
3544 return ifa;
3545}
3546
3547static void if6_seq_stop(struct seq_file *seq, void *v)
4f70ecca 3548 __releases(rcu_bh)
1da177e4 3549{
5c578aed 3550 rcu_read_unlock_bh();
1da177e4
LT		 3551}
3552
3553static int if6_seq_show(struct seq_file *seq, void *v)
3554{
3555 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
971a351c 3556 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
b071195d 3557 &ifp->addr,
1da177e4
LT		 3558 ifp->idev->dev->ifindex,
3559 ifp->prefix_len,
3560 ifp->scope,
971a351c 3561 (u8) ifp->flags,
1da177e4
LT		 3562 ifp->idev->dev->name);
3563 return 0;
3564}
3565
56b3d975 3566static const struct seq_operations if6_seq_ops = {
1da177e4
LT		 3567 .start = if6_seq_start,
3568 .next = if6_seq_next,
3569 .show = if6_seq_show,
3570 .stop = if6_seq_stop,
3571};
3572
3573static int if6_seq_open(struct inode *inode, struct file *file)
3574{
3c40090a
DL		 3575 return seq_open_net(inode, file, &if6_seq_ops,
3576 sizeof(struct if6_iter_state));
1da177e4
LT		 3577}
3578
9a32144e 3579static const struct file_operations if6_fops = {
1da177e4
LT		 3580 .owner = THIS_MODULE,
3581 .open = if6_seq_open,
3582 .read = seq_read,
3583 .llseek = seq_lseek,
3c40090a 3584 .release = seq_release_net,
1da177e4
LT		 3585};
3586
2c8c1e72 3587static int __net_init if6_proc_net_init(struct net *net)
1da177e4 3588{
d4beaa66 3589 if (!proc_create("if_inet6", S_IRUGO, net->proc_net, &if6_fops))
1da177e4
LT		 3590 return -ENOMEM;
3591 return 0;
3592}
3593
2c8c1e72 3594static void __net_exit if6_proc_net_exit(struct net *net)
3c40090a 3595{
ece31ffd 3596 remove_proc_entry("if_inet6", net->proc_net);
3c40090a
DL		 3597}
3598
3599static struct pernet_operations if6_proc_net_ops = {
67ba4152
IM		 3600 .init = if6_proc_net_init,
3601 .exit = if6_proc_net_exit,
3c40090a
DL		 3602};
3603
3604int __init if6_proc_init(void)
3605{
3606 return register_pernet_subsys(&if6_proc_net_ops);
3607}
3608
1da177e4
LT		 3609void if6_proc_exit(void)
3610{
3c40090a 3611 unregister_pernet_subsys(&if6_proc_net_ops);
1da177e4
LT		 3612}
3613#endif /* CONFIG_PROC_FS */
3614
07a93626 3615#if IS_ENABLED(CONFIG_IPV6_MIP6)
3b9f9a1c 3616/* Check if address is a home address configured on any interface. */
b71d1d42 3617int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr)
3b9f9a1c
NT		 3618{
3619 int ret = 0;
c2e21293 3620 struct inet6_ifaddr *ifp = NULL;
ddbe5032 3621 unsigned int hash = inet6_addr_hash(addr);
c2e21293 3622
5c578aed 3623 rcu_read_lock_bh();
b67bfe0d 3624 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
878628fb 3625 if (!net_eq(dev_net(ifp->idev->dev), net))
389f6612 3626 continue;
caad295f 3627 if (ipv6_addr_equal(&ifp->addr, addr) &&
3b9f9a1c
NT		 3628 (ifp->flags & IFA_F_HOMEADDRESS)) {
3629 ret = 1;
3630 break;
3631 }
3632 }
5c578aed 3633 rcu_read_unlock_bh();
3b9f9a1c
NT		 3634 return ret;
3635}
3636#endif
3637
1da177e4
LT		 3638/*
3639 * Periodic address status verification
3640 */
3641
c15b1cca 3642static void addrconf_verify_rtnl(void)
1da177e4 3643{
b2db7564 3644 unsigned long now, next, next_sec, next_sched;
1da177e4 3645 struct inet6_ifaddr *ifp;
1da177e4
LT		 3646 int i;
3647
c15b1cca
HFS		 3648 ASSERT_RTNL();
3649
5c578aed 3650 rcu_read_lock_bh();
1da177e4 3651 now = jiffies;
b2db7564 3652 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
1da177e4 3653
c15b1cca 3654 cancel_delayed_work(&addr_chk_work);
1da177e4 3655
bcdd553f 3656 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
1da177e4 3657restart:
c15b1cca 3658 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[i], addr_lst) {
1da177e4 3659 unsigned long age;
1da177e4 3660
fad8da3e
YA		 3661 /* When setting preferred_lft to a value not zero or
3662 * infinity, while valid_lft is infinity
3663 * IFA_F_PERMANENT has a non-infinity life time.
3664 */
3665 if ((ifp->flags & IFA_F_PERMANENT) &&
3666 (ifp->prefered_lft == INFINITY_LIFE_TIME))
1da177e4
LT		 3667 continue;
3668
3669 spin_lock(&ifp->lock);
b2db7564
YH		 3670 /* We try to batch several events at once. */
3671 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
1da177e4 3672
8f27ebb9
YH		 3673 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
3674 age >= ifp->valid_lft) {
1da177e4
LT		 3675 spin_unlock(&ifp->lock);
3676 in6_ifa_hold(ifp);
1da177e4
LT		 3677 ipv6_del_addr(ifp);
3678 goto restart;
8f27ebb9
YH		 3679 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
3680 spin_unlock(&ifp->lock);
3681 continue;
1da177e4 3682 } else if (age >= ifp->prefered_lft) {
a1ed0526 3683 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
1da177e4
LT		 3684 int deprecate = 0;
3685
3686 if (!(ifp->flags&IFA_F_DEPRECATED)) {
3687 deprecate = 1;
3688 ifp->flags |= IFA_F_DEPRECATED;
3689 }
3690
fad8da3e
YA		 3691 if ((ifp->valid_lft != INFINITY_LIFE_TIME) &&
3692 (time_before(ifp->tstamp + ifp->valid_lft * HZ, next)))
1da177e4
LT		 3693 next = ifp->tstamp + ifp->valid_lft * HZ;
3694
3695 spin_unlock(&ifp->lock);
3696
3697 if (deprecate) {
3698 in6_ifa_hold(ifp);
1da177e4
LT		 3699
3700 ipv6_ifa_notify(0, ifp);
3701 in6_ifa_put(ifp);
3702 goto restart;
3703 }
1da177e4
LT		 3704 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
3705 !(ifp->flags&IFA_F_TENTATIVE)) {
88949cf4 3706 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
3707 ifp->idev->cnf.dad_transmits *
1f9248e5 3708 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME) / HZ;
88949cf4 3709
1da177e4
LT		 3710 if (age >= ifp->prefered_lft - regen_advance) {
3711 struct inet6_ifaddr *ifpub = ifp->ifpub;
3712 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3713 next = ifp->tstamp + ifp->prefered_lft * HZ;
3714 if (!ifp->regen_count && ifpub) {
3715 ifp->regen_count++;
3716 in6_ifa_hold(ifp);
3717 in6_ifa_hold(ifpub);
3718 spin_unlock(&ifp->lock);
5c578aed 3719
291d809b
HY		 3720 spin_lock(&ifpub->lock);
3721 ifpub->regen_count = 0;
3722 spin_unlock(&ifpub->lock);
1da177e4
LT		 3723 ipv6_create_tempaddr(ifpub, ifp);
3724 in6_ifa_put(ifpub);
3725 in6_ifa_put(ifp);
3726 goto restart;
3727 }
3728 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
3729 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
3730 spin_unlock(&ifp->lock);
1da177e4
LT		 3731 } else {
3732 /* ifp->prefered_lft <= ifp->valid_lft */
3733 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3734 next = ifp->tstamp + ifp->prefered_lft * HZ;
3735 spin_unlock(&ifp->lock);
3736 }
3737 }
1da177e4
LT		 3738 }
3739
b2db7564
YH		 3740 next_sec = round_jiffies_up(next);
3741 next_sched = next;
3742
3743 /* If rounded timeout is accurate enough, accept it. */
3744 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
3745 next_sched = next_sec;
3746
3747 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
3748 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
3749 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
3750
ba3542e1 3751 ADBG(KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
3752 now, next, next_sec, next_sched);
c15b1cca 3753 mod_delayed_work(addrconf_wq, &addr_chk_work, next_sched - now);
5c578aed 3754 rcu_read_unlock_bh();
1da177e4
LT		 3755}
3756
c15b1cca
HFS		 3757static void addrconf_verify_work(struct work_struct *w)
3758{
3759 rtnl_lock();
3760 addrconf_verify_rtnl();
3761 rtnl_unlock();
3762}
3763
3764static void addrconf_verify(void)
3765{
3766 mod_delayed_work(addrconf_wq, &addr_chk_work, 0);
3767}
3768
caeaba79
ND		 3769static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local,
3770 struct in6_addr **peer_pfx)
461d8837
TG		 3771{
3772 struct in6_addr *pfx = NULL;
3773
caeaba79
ND		 3774 *peer_pfx = NULL;
3775
461d8837
TG		 3776 if (addr)
3777 pfx = nla_data(addr);
3778
3779 if (local) {
3780 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
caeaba79
ND		 3781 *peer_pfx = pfx;
3782 pfx = nla_data(local);
461d8837
TG		 3783 }
3784
3785 return pfx;
3786}
3787
ef7c79ed 3788static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
461d8837
TG		 3789 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
3790 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
3791 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
479840ff 3792 [IFA_FLAGS] = { .len = sizeof(u32) },
461d8837
TG		 3793};
3794
1da177e4 3795static int
661d2967 3796inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh)
1da177e4 3797{
3b1e0a65 3798 struct net *net = sock_net(skb->sk);
b933f716
TG		 3799 struct ifaddrmsg *ifm;
3800 struct nlattr *tb[IFA_MAX+1];
caeaba79 3801 struct in6_addr *pfx, *peer_pfx;
6046d5b4 3802 u32 ifa_flags;
b933f716 3803 int err;
1da177e4 3804
b933f716
TG		 3805 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3806 if (err < 0)
3807 return err;
3808
3809 ifm = nlmsg_data(nlh);
caeaba79 3810 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
1da177e4
LT		 3811 if (pfx == NULL)
3812 return -EINVAL;
3813
6046d5b4
HK		 3814 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
3815
3816 /* We ignore other flags so far. */
3817 ifa_flags &= IFA_F_MANAGETEMPADDR;
3818
3819 return inet6_addr_del(net, ifm->ifa_index, ifa_flags, pfx,
3820 ifm->ifa_prefixlen);
1da177e4
LT		 3821}
3822
479840ff 3823static int inet6_addr_modify(struct inet6_ifaddr *ifp, u32 ifa_flags,
55ebaef1 3824 u32 prefered_lft, u32 valid_lft)
081bba5b 3825{
6f704992
YH		 3826 u32 flags;
3827 clock_t expires;
4bed72e4 3828 unsigned long timeout;
53bd6749 3829 bool was_managetempaddr;
5b84efec 3830 bool had_prefixroute;
46d48046 3831
c15b1cca
HFS		 3832 ASSERT_RTNL();
3833
081bba5b
NT		 3834 if (!valid_lft || (prefered_lft > valid_lft))
3835 return -EINVAL;
3836
53bd6749
JP		 3837 if (ifa_flags & IFA_F_MANAGETEMPADDR &&
3838 (ifp->flags & IFA_F_TEMPORARY || ifp->prefix_len != 64))
3839 return -EINVAL;
3840
4bed72e4
YH		 3841 timeout = addrconf_timeout_fixup(valid_lft, HZ);
3842 if (addrconf_finite_timeout(timeout)) {
3843 expires = jiffies_to_clock_t(timeout * HZ);
3844 valid_lft = timeout;
6f704992 3845 flags = RTF_EXPIRES;
4bed72e4
YH		 3846 } else {
3847 expires = 0;
3848 flags = 0;
3849 ifa_flags |= IFA_F_PERMANENT;
6f704992 3850 }
081bba5b 3851
4bed72e4
YH		 3852 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
3853 if (addrconf_finite_timeout(timeout)) {
3854 if (timeout == 0)
3855 ifa_flags |= IFA_F_DEPRECATED;
3856 prefered_lft = timeout;
3857 }
081bba5b
NT		 3858
3859 spin_lock_bh(&ifp->lock);
53bd6749 3860 was_managetempaddr = ifp->flags & IFA_F_MANAGETEMPADDR;
5b84efec
TH		 3861 had_prefixroute = ifp->flags & IFA_F_PERMANENT &&
3862 !(ifp->flags & IFA_F_NOPREFIXROUTE);
53bd6749 3863 ifp->flags &= ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD |
761aac73
TH		 3864 IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
3865 IFA_F_NOPREFIXROUTE);
53bd6749 3866 ifp->flags |= ifa_flags;
081bba5b
NT		 3867 ifp->tstamp = jiffies;
3868 ifp->valid_lft = valid_lft;
3869 ifp->prefered_lft = prefered_lft;
3870
3871 spin_unlock_bh(&ifp->lock);
3872 if (!(ifp->flags&IFA_F_TENTATIVE))
3873 ipv6_ifa_notify(0, ifp);
081bba5b 3874
761aac73
TH		 3875 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) {
3876 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
3877 expires, flags);
5b84efec
TH		 3878 } else if (had_prefixroute) {
3879 enum cleanup_prefix_rt_t action;
3880 unsigned long rt_expires;
3881
3882 write_lock_bh(&ifp->idev->lock);
3883 action = check_cleanup_prefix_route(ifp, &rt_expires);
3884 write_unlock_bh(&ifp->idev->lock);
3885
3886 if (action != CLEANUP_PREFIX_RT_NOP) {
3887 cleanup_prefix_route(ifp, rt_expires,
3888 action == CLEANUP_PREFIX_RT_DEL);
3889 }
761aac73 3890 }
53bd6749
JP		 3891
3892 if (was_managetempaddr || ifp->flags & IFA_F_MANAGETEMPADDR) {
3893 if (was_managetempaddr && !(ifp->flags & IFA_F_MANAGETEMPADDR))
3894 valid_lft = prefered_lft = 0;
3895 manage_tempaddrs(ifp->idev, ifp, valid_lft, prefered_lft,
3896 !was_managetempaddr, jiffies);
3897 }
3898
c15b1cca 3899 addrconf_verify_rtnl();
081bba5b
NT		 3900
3901 return 0;
3902}
3903
1da177e4 3904static int
661d2967 3905inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh)
1da177e4 3906{
3b1e0a65 3907 struct net *net = sock_net(skb->sk);
461d8837
TG		 3908 struct ifaddrmsg *ifm;
3909 struct nlattr *tb[IFA_MAX+1];
caeaba79 3910 struct in6_addr *pfx, *peer_pfx;
7198f8ce
TG		 3911 struct inet6_ifaddr *ifa;
3912 struct net_device *dev;
55ebaef1 3913 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
479840ff 3914 u32 ifa_flags;
461d8837 3915 int err;
1da177e4 3916
461d8837
TG		 3917 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3918 if (err < 0)
3919 return err;
3920
3921 ifm = nlmsg_data(nlh);
caeaba79 3922 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
1da177e4
LT		 3923 if (pfx == NULL)
3924 return -EINVAL;
3925
461d8837 3926 if (tb[IFA_CACHEINFO]) {
0778769d 3927 struct ifa_cacheinfo *ci;
461d8837
TG		 3928
3929 ci = nla_data(tb[IFA_CACHEINFO]);
0778769d 3930 valid_lft = ci->ifa_valid;
461d8837
TG		 3931 preferred_lft = ci->ifa_prefered;
3932 } else {
3933 preferred_lft = INFINITY_LIFE_TIME;
3934 valid_lft = INFINITY_LIFE_TIME;
0778769d
NT		 3935 }
3936
af284937 3937 dev = __dev_get_by_index(net, ifm->ifa_index);
7198f8ce
TG		 3938 if (dev == NULL)
3939 return -ENODEV;
3940
479840ff
JP		 3941 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
3942
55ebaef1 3943 /* We ignore other flags so far. */
761aac73
TH		 3944 ifa_flags &= IFA_F_NODAD | IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
3945 IFA_F_NOPREFIXROUTE;
55ebaef1 3946
1cab3da6 3947 ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
7198f8ce
TG		 3948 if (ifa == NULL) {
3949 /*
3950 * It would be best to check for !NLM_F_CREATE here but
db9c7c39 3951 * userspace already relies on not having to provide this.
7198f8ce 3952 */
caeaba79 3953 return inet6_addr_add(net, ifm->ifa_index, pfx, peer_pfx,
af284937
DL		 3954 ifm->ifa_prefixlen, ifa_flags,
3955 preferred_lft, valid_lft);
081bba5b
NT		 3956 }
3957
7198f8ce
TG		 3958 if (nlh->nlmsg_flags & NLM_F_EXCL ||
3959 !(nlh->nlmsg_flags & NLM_F_REPLACE))
3960 err = -EEXIST;
3961 else
55ebaef1 3962 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
7198f8ce
TG		 3963
3964 in6_ifa_put(ifa);
3965
3966 return err;
1da177e4
LT		 3967}
3968
479840ff 3969static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u32 flags,
101bb229
TG		 3970 u8 scope, int ifindex)
3971{
3972 struct ifaddrmsg *ifm;
3973
3974 ifm = nlmsg_data(nlh);
3975 ifm->ifa_family = AF_INET6;
3976 ifm->ifa_prefixlen = prefixlen;
3977 ifm->ifa_flags = flags;
3978 ifm->ifa_scope = scope;
3979 ifm->ifa_index = ifindex;
3980}
3981
85486af0
TG		 3982static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
3983 unsigned long tstamp, u32 preferred, u32 valid)
3984{
3985 struct ifa_cacheinfo ci;
3986
18a31e1e
TG		 3987 ci.cstamp = cstamp_delta(cstamp);
3988 ci.tstamp = cstamp_delta(tstamp);
85486af0
TG		 3989 ci.ifa_prefered = preferred;
3990 ci.ifa_valid = valid;
3991
3992 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
3993}
3994
101bb229
TG		 3995static inline int rt_scope(int ifa_scope)
3996{
3997 if (ifa_scope & IFA_HOST)
3998 return RT_SCOPE_HOST;
3999 else if (ifa_scope & IFA_LINK)
4000 return RT_SCOPE_LINK;
4001 else if (ifa_scope & IFA_SITE)
4002 return RT_SCOPE_SITE;
4003 else
4004 return RT_SCOPE_UNIVERSE;
4005}
4006
0ab6803b
TG		 4007static inline int inet6_ifaddr_msgsize(void)
4008{
339bf98f 4009 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
caeaba79 4010 + nla_total_size(16) /* IFA_LOCAL */
339bf98f 4011 + nla_total_size(16) /* IFA_ADDRESS */
479840ff
JP		 4012 + nla_total_size(sizeof(struct ifa_cacheinfo))
4013 + nla_total_size(4) /* IFA_FLAGS */;
0ab6803b 4014}
c5396a31 4015
1da177e4 4016static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
15e47304 4017 u32 portid, u32 seq, int event, unsigned int flags)
1da177e4 4018{
1da177e4 4019 struct nlmsghdr *nlh;
85486af0 4020 u32 preferred, valid;
1da177e4 4021
15e47304 4022 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
0ab6803b 4023 if (nlh == NULL)
26932566 4024 return -EMSGSIZE;
0ab6803b 4025
101bb229
TG		 4026 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
4027 ifa->idev->dev->ifindex);
4028
fad8da3e
YA		 4029 if (!((ifa->flags&IFA_F_PERMANENT) &&
4030 (ifa->prefered_lft == INFINITY_LIFE_TIME))) {
85486af0
TG		 4031 preferred = ifa->prefered_lft;
4032 valid = ifa->valid_lft;
4033 if (preferred != INFINITY_LIFE_TIME) {
1da177e4 4034 long tval = (jiffies - ifa->tstamp)/HZ;
a1faa698
JR		 4035 if (preferred > tval)
4036 preferred -= tval;
4037 else
4038 preferred = 0;
f56619fc
BH		 4039 if (valid != INFINITY_LIFE_TIME) {
4040 if (valid > tval)
4041 valid -= tval;
4042 else
4043 valid = 0;
4044 }
1da177e4
LT		 4045 }
4046 } else {
85486af0
TG		 4047 preferred = INFINITY_LIFE_TIME;
4048 valid = INFINITY_LIFE_TIME;
4049 }
4050
7996c799 4051 if (!ipv6_addr_any(&ifa->peer_addr)) {
caeaba79
ND		 4052 if (nla_put(skb, IFA_LOCAL, 16, &ifa->addr) < 0 ||
4053 nla_put(skb, IFA_ADDRESS, 16, &ifa->peer_addr) < 0)
4054 goto error;
4055 } else
4056 if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0)
4057 goto error;
4058
4059 if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0)
4060 goto error;
1da177e4 4061
479840ff
JP		 4062 if (nla_put_u32(skb, IFA_FLAGS, ifa->flags) < 0)
4063 goto error;
4064
0ab6803b 4065 return nlmsg_end(skb, nlh);
caeaba79
ND		 4066
4067error:
4068 nlmsg_cancel(skb, nlh);
4069 return -EMSGSIZE;
1da177e4
LT		 4070}
4071
4072static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
15e47304 4073 u32 portid, u32 seq, int event, u16 flags)
1da177e4 4074{
1da177e4 4075 struct nlmsghdr *nlh;
101bb229
TG		 4076 u8 scope = RT_SCOPE_UNIVERSE;
4077 int ifindex = ifmca->idev->dev->ifindex;
4078
4079 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
4080 scope = RT_SCOPE_SITE;
1da177e4 4081
15e47304 4082 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
0ab6803b 4083 if (nlh == NULL)
26932566 4084 return -EMSGSIZE;
85486af0 4085
0ab6803b
TG		 4086 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
4087 if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 ||
4088 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
26932566
PM		 4089 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
4090 nlmsg_cancel(skb, nlh);
4091 return -EMSGSIZE;
4092 }
85486af0 4093
0ab6803b 4094 return nlmsg_end(skb, nlh);
1da177e4
LT		 4095}
4096
4097static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
15e47304 4098 u32 portid, u32 seq, int event, unsigned int flags)
1da177e4 4099{
1da177e4 4100 struct nlmsghdr *nlh;
101bb229
TG		 4101 u8 scope = RT_SCOPE_UNIVERSE;
4102 int ifindex = ifaca->aca_idev->dev->ifindex;
4103
4104 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
4105 scope = RT_SCOPE_SITE;
1da177e4 4106
15e47304 4107 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
0ab6803b 4108 if (nlh == NULL)
26932566 4109 return -EMSGSIZE;
85486af0 4110
0ab6803b
TG		 4111 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
4112 if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 ||
4113 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
26932566
PM		 4114 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
4115 nlmsg_cancel(skb, nlh);
4116 return -EMSGSIZE;
4117 }
1da177e4 4118
0ab6803b 4119 return nlmsg_end(skb, nlh);
1da177e4
LT		 4120}
4121
e21e8467 4122enum addr_type_t {
1da177e4
LT		 4123 UNICAST_ADDR,
4124 MULTICAST_ADDR,
4125 ANYCAST_ADDR,
4126};
4127
234b27c3
ED		 4128/* called with rcu_read_lock() */
4129static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
4130 struct netlink_callback *cb, enum addr_type_t type,
4131 int s_ip_idx, int *p_ip_idx)
4132{
234b27c3
ED		 4133 struct ifmcaddr6 *ifmca;
4134 struct ifacaddr6 *ifaca;
4135 int err = 1;
4136 int ip_idx = *p_ip_idx;
4137
4138 read_lock_bh(&idev->lock);
4139 switch (type) {
502a2ffd 4140 case UNICAST_ADDR: {
4141 struct inet6_ifaddr *ifa;
4142
234b27c3 4143 /* unicast address incl. temp addr */
502a2ffd 4144 list_for_each_entry(ifa, &idev->addr_list, if_list) {
4145 if (++ip_idx < s_ip_idx)
234b27c3
ED		 4146 continue;
4147 err = inet6_fill_ifaddr(skb, ifa,
15e47304 4148 NETLINK_CB(cb->skb).portid,
234b27c3
ED		 4149 cb->nlh->nlmsg_seq,
4150 RTM_NEWADDR,
4151 NLM_F_MULTI);
4152 if (err <= 0)
4153 break;
63998ac2 4154 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
234b27c3
ED		 4155 }
4156 break;
502a2ffd 4157 }
234b27c3
ED		 4158 case MULTICAST_ADDR:
4159 /* multicast address */
4160 for (ifmca = idev->mc_list; ifmca;
4161 ifmca = ifmca->next, ip_idx++) {
4162 if (ip_idx < s_ip_idx)
4163 continue;
4164 err = inet6_fill_ifmcaddr(skb, ifmca,
15e47304 4165 NETLINK_CB(cb->skb).portid,
234b27c3
ED		 4166 cb->nlh->nlmsg_seq,
4167 RTM_GETMULTICAST,
4168 NLM_F_MULTI);
4169 if (err <= 0)
4170 break;
4171 }
4172 break;
4173 case ANYCAST_ADDR:
4174 /* anycast address */
4175 for (ifaca = idev->ac_list; ifaca;
4176 ifaca = ifaca->aca_next, ip_idx++) {
4177 if (ip_idx < s_ip_idx)
4178 continue;
4179 err = inet6_fill_ifacaddr(skb, ifaca,
15e47304 4180 NETLINK_CB(cb->skb).portid,
234b27c3
ED		 4181 cb->nlh->nlmsg_seq,
4182 RTM_GETANYCAST,
4183 NLM_F_MULTI);
4184 if (err <= 0)
4185 break;
4186 }
4187 break;
4188 default:
4189 break;
4190 }
4191 read_unlock_bh(&idev->lock);
4192 *p_ip_idx = ip_idx;
4193 return err;
4194}
4195
1da177e4
LT		 4196static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
4197 enum addr_type_t type)
4198{
234b27c3
ED		 4199 struct net *net = sock_net(skb->sk);
4200 int h, s_h;
1da177e4
LT		 4201 int idx, ip_idx;
4202 int s_idx, s_ip_idx;
1da177e4 4203 struct net_device *dev;
234b27c3
ED		 4204 struct inet6_dev *idev;
4205 struct hlist_head *head;
1ab1457c 4206
234b27c3
ED		 4207 s_h = cb->args[0];
4208 s_idx = idx = cb->args[1];
4209 s_ip_idx = ip_idx = cb->args[2];
5d5619b4 4210
234b27c3 4211 rcu_read_lock();
63998ac2 4212 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ net->dev_base_seq;
234b27c3
ED		 4213 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4214 idx = 0;
4215 head = &net->dev_index_head[h];
b67bfe0d 4216 hlist_for_each_entry_rcu(dev, head, index_hlist) {
234b27c3
ED		 4217 if (idx < s_idx)
4218 goto cont;
4b97efdf 4219 if (h > s_h || idx > s_idx)
234b27c3
ED		 4220 s_ip_idx = 0;
4221 ip_idx = 0;
e21e8467
SH		 4222 idev = __in6_dev_get(dev);
4223 if (!idev)
234b27c3
ED		 4224 goto cont;
4225
4226 if (in6_dump_addrs(idev, skb, cb, type,
4227 s_ip_idx, &ip_idx) <= 0)
4228 goto done;
7562f876 4229cont:
234b27c3
ED		 4230 idx++;
4231 }
1da177e4 4232 }
234b27c3
ED		 4233done:
4234 rcu_read_unlock();
4235 cb->args[0] = h;
4236 cb->args[1] = idx;
4237 cb->args[2] = ip_idx;
4238
1da177e4
LT		 4239 return skb->len;
4240}
4241
4242static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
4243{
4244 enum addr_type_t type = UNICAST_ADDR;
b854272b 4245
1da177e4
LT		 4246 return inet6_dump_addr(skb, cb, type);
4247}
4248
4249static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
4250{
4251 enum addr_type_t type = MULTICAST_ADDR;
b854272b 4252
1da177e4
LT		 4253 return inet6_dump_addr(skb, cb, type);
4254}
4255
4256
4257static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
4258{
4259 enum addr_type_t type = ANYCAST_ADDR;
b854272b 4260
1da177e4
LT		 4261 return inet6_dump_addr(skb, cb, type);
4262}
4263
661d2967 4264static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh)
6c223828 4265{
3b1e0a65 4266 struct net *net = sock_net(in_skb->sk);
1b29fc2c
TG		 4267 struct ifaddrmsg *ifm;
4268 struct nlattr *tb[IFA_MAX+1];
caeaba79 4269 struct in6_addr *addr = NULL, *peer;
6c223828
NT		 4270 struct net_device *dev = NULL;
4271 struct inet6_ifaddr *ifa;
4272 struct sk_buff *skb;
6c223828
NT		 4273 int err;
4274
1b29fc2c
TG		 4275 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
4276 if (err < 0)
4277 goto errout;
4278
caeaba79 4279 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer);
1b29fc2c
TG		 4280 if (addr == NULL) {
4281 err = -EINVAL;
4282 goto errout;
6c223828 4283 }
6c223828 4284
1b29fc2c 4285 ifm = nlmsg_data(nlh);
6c223828 4286 if (ifm->ifa_index)
6fda7350 4287 dev = __dev_get_by_index(net, ifm->ifa_index);
6c223828 4288
e21e8467
SH		 4289 ifa = ipv6_get_ifaddr(net, addr, dev, 1);
4290 if (!ifa) {
1b29fc2c
TG		 4291 err = -EADDRNOTAVAIL;
4292 goto errout;
4293 }
6c223828 4294
e21e8467
SH		 4295 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
4296 if (!skb) {
6c223828 4297 err = -ENOBUFS;
1b29fc2c 4298 goto errout_ifa;
6c223828
NT		 4299 }
4300
15e47304 4301 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).portid,
6c223828 4302 nlh->nlmsg_seq, RTM_NEWADDR, 0);
26932566
PM		 4303 if (err < 0) {
4304 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4305 WARN_ON(err == -EMSGSIZE);
4306 kfree_skb(skb);
4307 goto errout_ifa;
4308 }
15e47304 4309 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
1b29fc2c 4310errout_ifa:
6c223828 4311 in6_ifa_put(ifa);
1b29fc2c 4312errout:
6c223828 4313 return err;
6c223828
NT		 4314}
4315
1da177e4
LT		 4316static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
4317{
4318 struct sk_buff *skb;
c346dca1 4319 struct net *net = dev_net(ifa->idev->dev);
5d620266 4320 int err = -ENOBUFS;
1da177e4 4321
0ab6803b 4322 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
5d620266
TG		 4323 if (skb == NULL)
4324 goto errout;
4325
4326 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
26932566
PM		 4327 if (err < 0) {
4328 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4329 WARN_ON(err == -EMSGSIZE);
4330 kfree_skb(skb);
4331 goto errout;
4332 }
1ce85fe4
PNA		 4333 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
4334 return;
5d620266
TG		 4335errout:
4336 if (err < 0)
6fda7350 4337 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
1da177e4
LT		 4338}
4339
b6f99a21 4340static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
1da177e4
LT		 4341 __s32 *array, int bytes)
4342{
04561c1f
TG		 4343 BUG_ON(bytes < (DEVCONF_MAX * 4));
4344
1da177e4
LT		 4345 memset(array, 0, bytes);
4346 array[DEVCONF_FORWARDING] = cnf->forwarding;
4347 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
4348 array[DEVCONF_MTU6] = cnf->mtu6;
4349 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
4350 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
4351 array[DEVCONF_AUTOCONF] = cnf->autoconf;
4352 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
4353 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
93908d19
TG		 4354 array[DEVCONF_RTR_SOLICIT_INTERVAL] =
4355 jiffies_to_msecs(cnf->rtr_solicit_interval);
4356 array[DEVCONF_RTR_SOLICIT_DELAY] =
4357 jiffies_to_msecs(cnf->rtr_solicit_delay);
1da177e4 4358 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
fc4eba58
HFS		 4359 array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] =
4360 jiffies_to_msecs(cnf->mldv1_unsolicited_report_interval);
4361 array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] =
4362 jiffies_to_msecs(cnf->mldv2_unsolicited_report_interval);
1da177e4
LT		 4363 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
4364 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
4365 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
4366 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
4367 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
1da177e4 4368 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
65f5c7c1 4369 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
c4fd30eb 4370 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
930d6ff2
YH		 4371#ifdef CONFIG_IPV6_ROUTER_PREF
4372 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
93908d19
TG		 4373 array[DEVCONF_RTR_PROBE_INTERVAL] =
4374 jiffies_to_msecs(cnf->rtr_probe_interval);
fa03ef38 4375#ifdef CONFIG_IPV6_ROUTE_INFO
09c884d4
YH		 4376 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
4377#endif
930d6ff2 4378#endif
fbea49e1 4379 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
0bcbc926 4380 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
95c385b4
NH		 4381#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4382 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
7fd2561e 4383 array[DEVCONF_USE_OPTIMISTIC] = cnf->use_optimistic;
95c385b4 4384#endif
7bc570c8
YH		 4385#ifdef CONFIG_IPV6_MROUTE
4386 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
4387#endif
778d80be 4388 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
1b34be74 4389 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
c3faca05 4390 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
5cb04436 4391 array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify;
b800c3b9 4392 array[DEVCONF_SUPPRESS_FRAG_NDISC] = cnf->suppress_frag_ndisc;
d9333196 4393 array[DEVCONF_ACCEPT_RA_FROM_LOCAL] = cnf->accept_ra_from_local;
1da177e4
LT		 4394}
4395
b382b191
TG		 4396static inline size_t inet6_ifla6_size(void)
4397{
4398 return nla_total_size(4) /* IFLA_INET6_FLAGS */
4399 + nla_total_size(sizeof(struct ifla_cacheinfo))
4400 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
4401 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
f53adae4
DB		 4402 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
4403 + nla_total_size(sizeof(struct in6_addr)); /* IFLA_INET6_TOKEN */
b382b191
TG		 4404}
4405
339bf98f
TG		 4406static inline size_t inet6_if_nlmsg_size(void)
4407{
4408 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
4409 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
4410 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
4411 + nla_total_size(4) /* IFLA_MTU */
4412 + nla_total_size(4) /* IFLA_LINK */
b382b191 4413 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */
339bf98f 4414}
c5396a31 4415
be281e55 4416static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib,
7d720c3e 4417 int items, int bytes)
7f7d9a6b
HX		 4418{
4419 int i;
4420 int pad = bytes - sizeof(u64) * items;
4421 BUG_ON(pad < 0);
4422
4423 /* Use put_unaligned() because stats may not be aligned for u64. */
4424 put_unaligned(items, &stats[0]);
4425 for (i = 1; i < items; i++)
be281e55 4426 put_unaligned(atomic_long_read(&mib[i]), &stats[i]);
7f7d9a6b
HX		 4427
4428 memset(&stats[items], 0, pad);
4429}
4430
698365fa 4431static inline void __snmp6_fill_stats64(u64 *stats, void __percpu *mib,
4ce3c183
ED		 4432 int items, int bytes, size_t syncpoff)
4433{
4434 int i;
4435 int pad = bytes - sizeof(u64) * items;
4436 BUG_ON(pad < 0);
4437
4438 /* Use put_unaligned() because stats may not be aligned for u64. */
4439 put_unaligned(items, &stats[0]);
4440 for (i = 1; i < items; i++)
4441 put_unaligned(snmp_fold_field64(mib, i, syncpoff), &stats[i]);
4442
4443 memset(&stats[items], 0, pad);
4444}
4445
7f7d9a6b
HX		 4446static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
4447 int bytes)
4448{
e21e8467 4449 switch (attrtype) {
7f7d9a6b 4450 case IFLA_INET6_STATS:
698365fa 4451 __snmp6_fill_stats64(stats, idev->stats.ipv6,
4ce3c183 4452 IPSTATS_MIB_MAX, bytes, offsetof(struct ipstats_mib, syncp));
7f7d9a6b
HX		 4453 break;
4454 case IFLA_INET6_ICMP6STATS:
be281e55 4455 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, ICMP6_MIB_MAX, bytes);
7f7d9a6b
HX		 4456 break;
4457 }
4458}
4459
b382b191
TG		 4460static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev)
4461{
4462 struct nlattr *nla;
4463 struct ifla_cacheinfo ci;
4464
c78679e8
DM		 4465 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags))
4466 goto nla_put_failure;
b382b191 4467 ci.max_reasm_len = IPV6_MAXPLEN;
24912420
DM		 4468 ci.tstamp = cstamp_delta(idev->tstamp);
4469 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time);
1f9248e5 4470 ci.retrans_time = jiffies_to_msecs(NEIGH_VAR(idev->nd_parms, RETRANS_TIME));
c78679e8
DM		 4471 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci))
4472 goto nla_put_failure;
b382b191
TG		 4473 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
4474 if (nla == NULL)
4475 goto nla_put_failure;
4476 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
4477
4478 /* XXX - MC not implemented */
4479
4480 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
4481 if (nla == NULL)
4482 goto nla_put_failure;
4483 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
4484
4485 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
4486 if (nla == NULL)
4487 goto nla_put_failure;
4488 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
4489
f53adae4
DB		 4490 nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr));
4491 if (nla == NULL)
4492 goto nla_put_failure;
bc91b0f0
JP		 4493
4494 if (nla_put_u8(skb, IFLA_INET6_ADDR_GEN_MODE, idev->addr_gen_mode))
4495 goto nla_put_failure;
4496
f53adae4
DB		 4497 read_lock_bh(&idev->lock);
4498 memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla));
4499 read_unlock_bh(&idev->lock);
4500
b382b191
TG		 4501 return 0;
4502
4503nla_put_failure:
4504 return -EMSGSIZE;
4505}
4506
4507static size_t inet6_get_link_af_size(const struct net_device *dev)
4508{
4509 if (!__in6_dev_get(dev))
4510 return 0;
4511
4512 return inet6_ifla6_size();
4513}
4514
4515static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev)
4516{
4517 struct inet6_dev *idev = __in6_dev_get(dev);
4518
4519 if (!idev)
4520 return -ENODATA;
4521
4522 if (inet6_fill_ifla6_attrs(skb, idev) < 0)
4523 return -EMSGSIZE;
4524
4525 return 0;
4526}
4527
f53adae4
DB		 4528static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token)
4529{
f53adae4
DB		 4530 struct inet6_ifaddr *ifp;
4531 struct net_device *dev = idev->dev;
fc403832 4532 bool update_rs = false;
dc848292 4533 struct in6_addr ll_addr;
f53adae4 4534
c15b1cca
HFS		 4535 ASSERT_RTNL();
4536
f53adae4
DB		 4537 if (token == NULL)
4538 return -EINVAL;
4539 if (ipv6_addr_any(token))
4540 return -EINVAL;
4541 if (dev->flags & (IFF_LOOPBACK | IFF_NOARP))
4542 return -EINVAL;
f53adae4
DB		 4543 if (!ipv6_accept_ra(idev))
4544 return -EINVAL;
4545 if (idev->cnf.rtr_solicits <= 0)
4546 return -EINVAL;
4547
4548 write_lock_bh(&idev->lock);
4549
4550 BUILD_BUG_ON(sizeof(token->s6_addr) != 16);
4551 memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8);
4552
4553 write_unlock_bh(&idev->lock);
4554
dc848292
HFS		 4555 if (!idev->dead && (idev->if_flags & IF_READY) &&
4556 !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE |
4557 IFA_F_OPTIMISTIC)) {
fc403832
DB		 4558
4559 /* If we're not ready, then normal ifup will take care
4560 * of this. Otherwise, we need to request our rs here.
4561 */
4562 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters);
4563 update_rs = true;
4564 }
f53adae4
DB		 4565
4566 write_lock_bh(&idev->lock);
fc403832 4567
77ecaace 4568 if (update_rs) {
fc403832 4569 idev->if_flags |= IF_RS_SENT;
77ecaace
HFS		 4570 idev->rs_probes = 1;
4571 addrconf_mod_rs_timer(idev, idev->cnf.rtr_solicit_interval);
4572 }
f53adae4
DB		 4573
4574 /* Well, that's kinda nasty ... */
4575 list_for_each_entry(ifp, &idev->addr_list, if_list) {
4576 spin_lock(&ifp->lock);
617fe29d 4577 if (ifp->tokenized) {
f53adae4
DB		 4578 ifp->valid_lft = 0;
4579 ifp->prefered_lft = 0;
4580 }
4581 spin_unlock(&ifp->lock);
4582 }
4583
4584 write_unlock_bh(&idev->lock);
b2ed64a9 4585 inet6_ifinfo_notify(RTM_NEWLINK, idev);
c15b1cca 4586 addrconf_verify_rtnl();
f53adae4
DB		 4587 return 0;
4588}
4589
4590static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla)
4591{
4592 int err = -EINVAL;
4593 struct inet6_dev *idev = __in6_dev_get(dev);
4594 struct nlattr *tb[IFLA_INET6_MAX + 1];
4595
4596 if (!idev)
4597 return -EAFNOSUPPORT;
4598
4599 if (nla_parse_nested(tb, IFLA_INET6_MAX, nla, NULL) < 0)
4600 BUG();
4601
bc91b0f0 4602 if (tb[IFLA_INET6_TOKEN]) {
f53adae4 4603 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN]));
bc91b0f0
JP		 4604 if (err)
4605 return err;
4606 }
4607
4608 if (tb[IFLA_INET6_ADDR_GEN_MODE]) {
4609 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]);
4610
4611 if (mode != IN6_ADDR_GEN_MODE_EUI64 &&
4612 mode != IN6_ADDR_GEN_MODE_NONE)
4613 return -EINVAL;
4614 idev->addr_gen_mode = mode;
4615 err = 0;
4616 }
f53adae4
DB		 4617
4618 return err;
4619}
4620
1ab1457c 4621static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
15e47304 4622 u32 portid, u32 seq, int event, unsigned int flags)
1da177e4 4623{
04561c1f 4624 struct net_device *dev = idev->dev;
04561c1f
TG		 4625 struct ifinfomsg *hdr;
4626 struct nlmsghdr *nlh;
4627 void *protoinfo;
04561c1f 4628
15e47304 4629 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags);
04561c1f 4630 if (nlh == NULL)
26932566 4631 return -EMSGSIZE;
04561c1f
TG		 4632
4633 hdr = nlmsg_data(nlh);
4634 hdr->ifi_family = AF_INET6;
4635 hdr->__ifi_pad = 0;
4636 hdr->ifi_type = dev->type;
4637 hdr->ifi_index = dev->ifindex;
4638 hdr->ifi_flags = dev_get_flags(dev);
4639 hdr->ifi_change = 0;
4640
c78679e8
DM		 4641 if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
4642 (dev->addr_len &&
4643 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
4644 nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
4645 (dev->ifindex != dev->iflink &&
4646 nla_put_u32(skb, IFLA_LINK, dev->iflink)))
4647 goto nla_put_failure;
04561c1f
TG		 4648 protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
4649 if (protoinfo == NULL)
4650 goto nla_put_failure;
1da177e4 4651
b382b191 4652 if (inet6_fill_ifla6_attrs(skb, idev) < 0)
bf99f1bd 4653 goto nla_put_failure;
1da177e4 4654
04561c1f
TG		 4655 nla_nest_end(skb, protoinfo);
4656 return nlmsg_end(skb, nlh);
1da177e4 4657
04561c1f 4658nla_put_failure:
26932566
PM		 4659 nlmsg_cancel(skb, nlh);
4660 return -EMSGSIZE;
1da177e4
LT		 4661}
4662
4663static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
4664{
3b1e0a65 4665 struct net *net = sock_net(skb->sk);
84d2697d 4666 int h, s_h;
434a8a58 4667 int idx = 0, s_idx;
1da177e4
LT		 4668 struct net_device *dev;
4669 struct inet6_dev *idev;
84d2697d 4670 struct hlist_head *head;
1da177e4 4671
84d2697d
ED		 4672 s_h = cb->args[0];
4673 s_idx = cb->args[1];
4674
4675 rcu_read_lock();
4676 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4677 idx = 0;
4678 head = &net->dev_index_head[h];
b67bfe0d 4679 hlist_for_each_entry_rcu(dev, head, index_hlist) {
84d2697d
ED		 4680 if (idx < s_idx)
4681 goto cont;
4682 idev = __in6_dev_get(dev);
4683 if (!idev)
4684 goto cont;
4685 if (inet6_fill_ifinfo(skb, idev,
15e47304 4686 NETLINK_CB(cb->skb).portid,
84d2697d
ED		 4687 cb->nlh->nlmsg_seq,
4688 RTM_NEWLINK, NLM_F_MULTI) <= 0)
4689 goto out;
7562f876 4690cont:
84d2697d
ED		 4691 idx++;
4692 }
1da177e4 4693 }
84d2697d
ED		 4694out:
4695 rcu_read_unlock();
4696 cb->args[1] = idx;
4697 cb->args[0] = h;
1da177e4
LT		 4698
4699 return skb->len;
4700}
4701
4702void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
4703{
4704 struct sk_buff *skb;
c346dca1 4705 struct net *net = dev_net(idev->dev);
8d7a76c9 4706 int err = -ENOBUFS;
1ab1457c 4707
339bf98f 4708 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
8d7a76c9
TG		 4709 if (skb == NULL)
4710 goto errout;
4711
4712 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
26932566
PM		 4713 if (err < 0) {
4714 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
4715 WARN_ON(err == -EMSGSIZE);
4716 kfree_skb(skb);
4717 goto errout;
4718 }
5f75a104 4719 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC);
1ce85fe4 4720 return;
8d7a76c9
TG		 4721errout:
4722 if (err < 0)
5f75a104 4723 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err);
1da177e4
LT		 4724}
4725
339bf98f
TG		 4726static inline size_t inet6_prefix_nlmsg_size(void)
4727{
4728 return NLMSG_ALIGN(sizeof(struct prefixmsg))
4729 + nla_total_size(sizeof(struct in6_addr))
4730 + nla_total_size(sizeof(struct prefix_cacheinfo));
4731}
c5396a31 4732
1da177e4 4733static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
15e47304 4734 struct prefix_info *pinfo, u32 portid, u32 seq,
6051e2f4 4735 int event, unsigned int flags)
1da177e4 4736{
6051e2f4
TG		 4737 struct prefixmsg *pmsg;
4738 struct nlmsghdr *nlh;
1da177e4
LT		 4739 struct prefix_cacheinfo ci;
4740
15e47304 4741 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags);
6051e2f4 4742 if (nlh == NULL)
26932566 4743 return -EMSGSIZE;
6051e2f4
TG		 4744
4745 pmsg = nlmsg_data(nlh);
1da177e4 4746 pmsg->prefix_family = AF_INET6;
8a47077a
PM		 4747 pmsg->prefix_pad1 = 0;
4748 pmsg->prefix_pad2 = 0;
1da177e4
LT		 4749 pmsg->prefix_ifindex = idev->dev->ifindex;
4750 pmsg->prefix_len = pinfo->prefix_len;
4751 pmsg->prefix_type = pinfo->type;
8a47077a 4752 pmsg->prefix_pad3 = 0;
1da177e4
LT		 4753 pmsg->prefix_flags = 0;
4754 if (pinfo->onlink)
4755 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
4756 if (pinfo->autoconf)
4757 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
4758
c78679e8
DM		 4759 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix))
4760 goto nla_put_failure;
1da177e4
LT		 4761 ci.preferred_time = ntohl(pinfo->prefered);
4762 ci.valid_time = ntohl(pinfo->valid);
c78679e8
DM		 4763 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci))
4764 goto nla_put_failure;
6051e2f4 4765 return nlmsg_end(skb, nlh);
1da177e4 4766
6051e2f4 4767nla_put_failure:
26932566
PM		 4768 nlmsg_cancel(skb, nlh);
4769 return -EMSGSIZE;
1da177e4
LT		 4770}
4771
1ab1457c 4772static void inet6_prefix_notify(int event, struct inet6_dev *idev,
1da177e4
LT		 4773 struct prefix_info *pinfo)
4774{
4775 struct sk_buff *skb;
c346dca1 4776 struct net *net = dev_net(idev->dev);
8c384bfa 4777 int err = -ENOBUFS;
1da177e4 4778
339bf98f 4779 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
8c384bfa
TG		 4780 if (skb == NULL)
4781 goto errout;
4782
4783 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
26932566
PM		 4784 if (err < 0) {
4785 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
4786 WARN_ON(err == -EMSGSIZE);
4787 kfree_skb(skb);
4788 goto errout;
4789 }
1ce85fe4
PNA		 4790 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
4791 return;
8c384bfa
TG		 4792errout:
4793 if (err < 0)
6fda7350 4794 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
1da177e4
LT		 4795}
4796
1da177e4
LT		 4797static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4798{
63998ac2
ND		 4799 struct net *net = dev_net(ifp->idev->dev);
4800
c15b1cca
HFS		 4801 if (event)
4802 ASSERT_RTNL();
4803
1da177e4
LT		 4804 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
4805
4806 switch (event) {
4807 case RTM_NEWADDR:
95c385b4
NH		 4808 /*
4809 * If the address was optimistic
4810 * we inserted the route at the start of
4811 * our DAD process, so we don't need
4812 * to do it again
4813 */
4814 if (!(ifp->rt->rt6i_node))
4815 ip6_ins_rt(ifp->rt);
1da177e4
LT		 4816 if (ifp->idev->cnf.forwarding)
4817 addrconf_join_anycast(ifp);
7996c799 4818 if (!ipv6_addr_any(&ifp->peer_addr))
caeaba79
ND		 4819 addrconf_prefix_route(&ifp->peer_addr, 128,
4820 ifp->idev->dev, 0, 0);
1da177e4
LT		 4821 break;
4822 case RTM_DELADDR:
4823 if (ifp->idev->cnf.forwarding)
4824 addrconf_leave_anycast(ifp);
4825 addrconf_leave_solict(ifp->idev, &ifp->addr);
7996c799 4826 if (!ipv6_addr_any(&ifp->peer_addr)) {
caeaba79 4827 struct rt6_info *rt;
caeaba79 4828
e7478dfc
ND		 4829 rt = addrconf_get_prefix_route(&ifp->peer_addr, 128,
4830 ifp->idev->dev, 0, 0);
f24062b0
ND		 4831 if (rt && ip6_del_rt(rt))
4832 dst_free(&rt->dst);
caeaba79 4833 }
d8d1f30b 4834 dst_hold(&ifp->rt->dst);
93fa159a 4835
73a8bd74 4836 if (ip6_del_rt(ifp->rt))
d8d1f30b 4837 dst_free(&ifp->rt->dst);
705f1c86
HFS		 4838
4839 rt_genid_bump_ipv6(net);
1da177e4
LT		 4840 break;
4841 }
63998ac2 4842 atomic_inc(&net->ipv6.dev_addr_genid);
1da177e4
LT		 4843}
4844
4845static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4846{
8814c4b5 4847 rcu_read_lock_bh();
1da177e4
LT		 4848 if (likely(ifp->idev->dead == 0))
4849 __ipv6_ifa_notify(event, ifp);
8814c4b5 4850 rcu_read_unlock_bh();
1da177e4
LT		 4851}
4852
4853#ifdef CONFIG_SYSCTL
4854
4855static
fe2c6338 4856int addrconf_sysctl_forward(struct ctl_table *ctl, int write,
1da177e4
LT		 4857 void __user *buffer, size_t *lenp, loff_t *ppos)
4858{
4859 int *valp = ctl->data;
4860 int val = *valp;
88af182e 4861 loff_t pos = *ppos;
fe2c6338 4862 struct ctl_table lctl;
1da177e4
LT		 4863 int ret;
4864
013d97e9
FR		 4865 /*
4866 * ctl->data points to idev->cnf.forwarding, we should
4867 * not modify it until we get the rtnl lock.
4868 */
4869 lctl = *ctl;
4870 lctl.data = &val;
4871
4872 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
1da177e4 4873
c8fecf22 4874 if (write)
b325fddb 4875 ret = addrconf_fixup_forwarding(ctl, valp, val);
88af182e
EB		 4876 if (ret)
4877 *ppos = pos;
1ab1457c 4878 return ret;
1da177e4
LT		 4879}
4880
56d417b1
BH		 4881static void dev_disable_change(struct inet6_dev *idev)
4882{
75538c2b
CW		 4883 struct netdev_notifier_info info;
4884
56d417b1
BH		 4885 if (!idev || !idev->dev)
4886 return;
4887
75538c2b 4888 netdev_notifier_info_init(&info, idev->dev);
56d417b1 4889 if (idev->cnf.disable_ipv6)
75538c2b 4890 addrconf_notify(NULL, NETDEV_DOWN, &info);
56d417b1 4891 else
75538c2b 4892 addrconf_notify(NULL, NETDEV_UP, &info);
56d417b1
BH		 4893}
4894
4895static void addrconf_disable_change(struct net *net, __s32 newf)
4896{
4897 struct net_device *dev;
4898 struct inet6_dev *idev;
4899
c6d14c84
ED		 4900 rcu_read_lock();
4901 for_each_netdev_rcu(net, dev) {
56d417b1
BH		 4902 idev = __in6_dev_get(dev);
4903 if (idev) {
4904 int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
4905 idev->cnf.disable_ipv6 = newf;
4906 if (changed)
4907 dev_disable_change(idev);
4908 }
56d417b1 4909 }
c6d14c84 4910 rcu_read_unlock();
56d417b1
BH		 4911}
4912
013d97e9 4913static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf)
56d417b1
BH		 4914{
4915 struct net *net;
013d97e9
FR		 4916 int old;
4917
4918 if (!rtnl_trylock())
4919 return restart_syscall();
56d417b1
BH		 4920
4921 net = (struct net *)table->extra2;
013d97e9
FR		 4922 old = *p;
4923 *p = newf;
56d417b1 4924
013d97e9
FR		 4925 if (p == &net->ipv6.devconf_dflt->disable_ipv6) {
4926 rtnl_unlock();
56d417b1 4927 return 0;
88af182e 4928 }
56d417b1
BH		 4929
4930 if (p == &net->ipv6.devconf_all->disable_ipv6) {
56d417b1
BH		 4931 net->ipv6.devconf_dflt->disable_ipv6 = newf;
4932 addrconf_disable_change(net, newf);
013d97e9 4933 } else if ((!newf) ^ (!old))
56d417b1
BH		 4934 dev_disable_change((struct inet6_dev *)table->extra1);
4935
4936 rtnl_unlock();
4937 return 0;
4938}
4939
4940static
fe2c6338 4941int addrconf_sysctl_disable(struct ctl_table *ctl, int write,
56d417b1
BH		 4942 void __user *buffer, size_t *lenp, loff_t *ppos)
4943{
4944 int *valp = ctl->data;
4945 int val = *valp;
88af182e 4946 loff_t pos = *ppos;
fe2c6338 4947 struct ctl_table lctl;
56d417b1
BH		 4948 int ret;
4949
013d97e9
FR		 4950 /*
4951 * ctl->data points to idev->cnf.disable_ipv6, we should
4952 * not modify it until we get the rtnl lock.
4953 */
4954 lctl = *ctl;
4955 lctl.data = &val;
4956
4957 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
56d417b1
BH		 4958
4959 if (write)
4960 ret = addrconf_disable_ipv6(ctl, valp, val);
88af182e
EB		 4961 if (ret)
4962 *ppos = pos;
56d417b1
BH		 4963 return ret;
4964}
4965
c92d5491 4966static
4967int addrconf_sysctl_proxy_ndp(struct ctl_table *ctl, int write,
4968 void __user *buffer, size_t *lenp, loff_t *ppos)
4969{
4970 int *valp = ctl->data;
4971 int ret;
4972 int old, new;
4973
4974 old = *valp;
4975 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
4976 new = *valp;
4977
4978 if (write && old != new) {
4979 struct net *net = ctl->extra2;
4980
4981 if (!rtnl_trylock())
4982 return restart_syscall();
4983
4984 if (valp == &net->ipv6.devconf_dflt->proxy_ndp)
4985 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
4986 NETCONFA_IFINDEX_DEFAULT,
4987 net->ipv6.devconf_dflt);
4988 else if (valp == &net->ipv6.devconf_all->proxy_ndp)
4989 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
4990 NETCONFA_IFINDEX_ALL,
4991 net->ipv6.devconf_all);
4992 else {
4993 struct inet6_dev *idev = ctl->extra1;
4994
4995 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
4996 idev->dev->ifindex,
4997 &idev->cnf);
4998 }
4999 rtnl_unlock();
5000 }
5001
5002 return ret;
5003}
5004
5005
1da177e4
LT		 5006static struct addrconf_sysctl_table
5007{
5008 struct ctl_table_header *sysctl_header;
fe2c6338 5009 struct ctl_table addrconf_vars[DEVCONF_MAX+1];
ab32ea5d 5010} addrconf_sysctl __read_mostly = {
1da177e4
LT		 5011 .sysctl_header = NULL,
5012 .addrconf_vars = {
1ab1457c 5013 {
e21e8467
SH		 5014 .procname = "forwarding",
5015 .data = &ipv6_devconf.forwarding,
5016 .maxlen = sizeof(int),
5017 .mode = 0644,
5018 .proc_handler = addrconf_sysctl_forward,
1da177e4
LT		 5019 },
5020 {
e21e8467
SH		 5021 .procname = "hop_limit",
5022 .data = &ipv6_devconf.hop_limit,
5023 .maxlen = sizeof(int),
5024 .mode = 0644,
5025 .proc_handler = proc_dointvec,
1da177e4
LT		 5026 },
5027 {
e21e8467
SH		 5028 .procname = "mtu",
5029 .data = &ipv6_devconf.mtu6,
5030 .maxlen = sizeof(int),
5031 .mode = 0644,
5032 .proc_handler = proc_dointvec,
1da177e4
LT		 5033 },
5034 {
e21e8467
SH		 5035 .procname = "accept_ra",
5036 .data = &ipv6_devconf.accept_ra,
5037 .maxlen = sizeof(int),
5038 .mode = 0644,
5039 .proc_handler = proc_dointvec,
1da177e4
LT		 5040 },
5041 {
e21e8467
SH		 5042 .procname = "accept_redirects",
5043 .data = &ipv6_devconf.accept_redirects,
5044 .maxlen = sizeof(int),
5045 .mode = 0644,
5046 .proc_handler = proc_dointvec,
1da177e4
LT		 5047 },
5048 {
e21e8467
SH		 5049 .procname = "autoconf",
5050 .data = &ipv6_devconf.autoconf,
5051 .maxlen = sizeof(int),
5052 .mode = 0644,
5053 .proc_handler = proc_dointvec,
1da177e4
LT		 5054 },
5055 {
e21e8467
SH		 5056 .procname = "dad_transmits",
5057 .data = &ipv6_devconf.dad_transmits,
5058 .maxlen = sizeof(int),
5059 .mode = 0644,
5060 .proc_handler = proc_dointvec,
1da177e4
LT		 5061 },
5062 {
e21e8467
SH		 5063 .procname = "router_solicitations",
5064 .data = &ipv6_devconf.rtr_solicits,
5065 .maxlen = sizeof(int),
5066 .mode = 0644,
5067 .proc_handler = proc_dointvec,
1da177e4
LT		 5068 },
5069 {
e21e8467
SH		 5070 .procname = "router_solicitation_interval",
5071 .data = &ipv6_devconf.rtr_solicit_interval,
5072 .maxlen = sizeof(int),
5073 .mode = 0644,
5074 .proc_handler = proc_dointvec_jiffies,
1da177e4
LT		 5075 },
5076 {
e21e8467
SH		 5077 .procname = "router_solicitation_delay",
5078 .data = &ipv6_devconf.rtr_solicit_delay,
5079 .maxlen = sizeof(int),
5080 .mode = 0644,
5081 .proc_handler = proc_dointvec_jiffies,
1da177e4
LT		 5082 },
5083 {
e21e8467
SH		 5084 .procname = "force_mld_version",
5085 .data = &ipv6_devconf.force_mld_version,
5086 .maxlen = sizeof(int),
5087 .mode = 0644,
5088 .proc_handler = proc_dointvec,
1da177e4 5089 },
fc4eba58
HFS		 5090 {
5091 .procname = "mldv1_unsolicited_report_interval",
5092 .data =
5093 &ipv6_devconf.mldv1_unsolicited_report_interval,
5094 .maxlen = sizeof(int),
5095 .mode = 0644,
5096 .proc_handler = proc_dointvec_ms_jiffies,
5097 },
5098 {
5099 .procname = "mldv2_unsolicited_report_interval",
5100 .data =
5101 &ipv6_devconf.mldv2_unsolicited_report_interval,
5102 .maxlen = sizeof(int),
5103 .mode = 0644,
5104 .proc_handler = proc_dointvec_ms_jiffies,
5105 },
1da177e4 5106 {
e21e8467
SH		 5107 .procname = "use_tempaddr",
5108 .data = &ipv6_devconf.use_tempaddr,
5109 .maxlen = sizeof(int),
5110 .mode = 0644,
5111 .proc_handler = proc_dointvec,
1da177e4
LT		 5112 },
5113 {
e21e8467
SH		 5114 .procname = "temp_valid_lft",
5115 .data = &ipv6_devconf.temp_valid_lft,
5116 .maxlen = sizeof(int),
5117 .mode = 0644,
5118 .proc_handler = proc_dointvec,
1da177e4
LT		 5119 },
5120 {
e21e8467
SH		 5121 .procname = "temp_prefered_lft",
5122 .data = &ipv6_devconf.temp_prefered_lft,
5123 .maxlen = sizeof(int),
5124 .mode = 0644,
5125 .proc_handler = proc_dointvec,
1da177e4
LT		 5126 },
5127 {
e21e8467
SH		 5128 .procname = "regen_max_retry",
5129 .data = &ipv6_devconf.regen_max_retry,
5130 .maxlen = sizeof(int),
5131 .mode = 0644,
5132 .proc_handler = proc_dointvec,
1da177e4
LT		 5133 },
5134 {
e21e8467
SH		 5135 .procname = "max_desync_factor",
5136 .data = &ipv6_devconf.max_desync_factor,
5137 .maxlen = sizeof(int),
5138 .mode = 0644,
5139 .proc_handler = proc_dointvec,
1da177e4 5140 },
1da177e4 5141 {
e21e8467
SH		 5142 .procname = "max_addresses",
5143 .data = &ipv6_devconf.max_addresses,
5144 .maxlen = sizeof(int),
5145 .mode = 0644,
5146 .proc_handler = proc_dointvec,
1da177e4 5147 },
65f5c7c1 5148 {
e21e8467
SH		 5149 .procname = "accept_ra_defrtr",
5150 .data = &ipv6_devconf.accept_ra_defrtr,
5151 .maxlen = sizeof(int),
5152 .mode = 0644,
5153 .proc_handler = proc_dointvec,
65f5c7c1 5154 },
c4fd30eb 5155 {
e21e8467
SH		 5156 .procname = "accept_ra_pinfo",
5157 .data = &ipv6_devconf.accept_ra_pinfo,
5158 .maxlen = sizeof(int),
5159 .mode = 0644,
5160 .proc_handler = proc_dointvec,
c4fd30eb 5161 },
930d6ff2
YH		 5162#ifdef CONFIG_IPV6_ROUTER_PREF
5163 {
e21e8467
SH		 5164 .procname = "accept_ra_rtr_pref",
5165 .data = &ipv6_devconf.accept_ra_rtr_pref,
5166 .maxlen = sizeof(int),
5167 .mode = 0644,
5168 .proc_handler = proc_dointvec,
930d6ff2 5169 },
52e16356 5170 {
e21e8467
SH		 5171 .procname = "router_probe_interval",
5172 .data = &ipv6_devconf.rtr_probe_interval,
5173 .maxlen = sizeof(int),
5174 .mode = 0644,
5175 .proc_handler = proc_dointvec_jiffies,
52e16356 5176 },
fa03ef38 5177#ifdef CONFIG_IPV6_ROUTE_INFO
09c884d4 5178 {
e21e8467
SH		 5179 .procname = "accept_ra_rt_info_max_plen",
5180 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
5181 .maxlen = sizeof(int),
5182 .mode = 0644,
5183 .proc_handler = proc_dointvec,
09c884d4
YH		 5184 },
5185#endif
930d6ff2 5186#endif
fbea49e1 5187 {
e21e8467
SH		 5188 .procname = "proxy_ndp",
5189 .data = &ipv6_devconf.proxy_ndp,
5190 .maxlen = sizeof(int),
5191 .mode = 0644,
c92d5491 5192 .proc_handler = addrconf_sysctl_proxy_ndp,
fbea49e1 5193 },
0bcbc926 5194 {
e21e8467
SH		 5195 .procname = "accept_source_route",
5196 .data = &ipv6_devconf.accept_source_route,
5197 .maxlen = sizeof(int),
5198 .mode = 0644,
5199 .proc_handler = proc_dointvec,
0bcbc926 5200 },
95c385b4
NH		 5201#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
5202 {
e21e8467
SH		 5203 .procname = "optimistic_dad",
5204 .data = &ipv6_devconf.optimistic_dad,
5205 .maxlen = sizeof(int),
5206 .mode = 0644,
5207 .proc_handler = proc_dointvec,
95c385b4
NH		 5208
5209 },
7fd2561e
EK		 5210 {
5211 .procname = "use_optimistic",
5212 .data = &ipv6_devconf.use_optimistic,
5213 .maxlen = sizeof(int),
5214 .mode = 0644,
5215 .proc_handler = proc_dointvec,
5216
5217 },
7bc570c8
YH		 5218#endif
5219#ifdef CONFIG_IPV6_MROUTE
5220 {
e21e8467
SH		 5221 .procname = "mc_forwarding",
5222 .data = &ipv6_devconf.mc_forwarding,
5223 .maxlen = sizeof(int),
5224 .mode = 0444,
5225 .proc_handler = proc_dointvec,
7bc570c8 5226 },
95c385b4 5227#endif
778d80be 5228 {
e21e8467
SH		 5229 .procname = "disable_ipv6",
5230 .data = &ipv6_devconf.disable_ipv6,
5231 .maxlen = sizeof(int),
5232 .mode = 0644,
5233 .proc_handler = addrconf_sysctl_disable,
778d80be 5234 },
1b34be74 5235 {
e21e8467
SH		 5236 .procname = "accept_dad",
5237 .data = &ipv6_devconf.accept_dad,
5238 .maxlen = sizeof(int),
5239 .mode = 0644,
5240 .proc_handler = proc_dointvec,
1b34be74 5241 },
f7734fdf 5242 {
f7734fdf
OP		 5243 .procname = "force_tllao",
5244 .data = &ipv6_devconf.force_tllao,
5245 .maxlen = sizeof(int),
5246 .mode = 0644,
5247 .proc_handler = proc_dointvec
5248 },
5cb04436
HFS		 5249 {
5250 .procname = "ndisc_notify",
5251 .data = &ipv6_devconf.ndisc_notify,
5252 .maxlen = sizeof(int),
5253 .mode = 0644,
5254 .proc_handler = proc_dointvec
5255 },
b800c3b9
HFS		 5256 {
5257 .procname = "suppress_frag_ndisc",
5258 .data = &ipv6_devconf.suppress_frag_ndisc,
5259 .maxlen = sizeof(int),
5260 .mode = 0644,
5261 .proc_handler = proc_dointvec
5262 },
d9333196
BG		 5263 {
5264 .procname = "accept_ra_from_local",
5265 .data = &ipv6_devconf.accept_ra_from_local,
5266 .maxlen = sizeof(int),
5267 .mode = 0644,
5268 .proc_handler = proc_dointvec,
5269 },
1da177e4 5270 {
f8572d8f 5271 /* sentinel */
1da177e4
LT		 5272 }
5273 },
1da177e4
LT		 5274};
5275
bff16c2f 5276static int __addrconf_sysctl_register(struct net *net, char *dev_name,
f8572d8f 5277 struct inet6_dev *idev, struct ipv6_devconf *p)
1da177e4
LT		 5278{
5279 int i;
1da177e4 5280 struct addrconf_sysctl_table *t;
6105e293 5281 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ];
1dab6222 5282
af879cc7 5283 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
1da177e4 5284 if (t == NULL)
f68635e6
PE		 5285 goto out;
5286
bcdd553f 5287 for (i = 0; t->addrconf_vars[i].data; i++) {
e21e8467 5288 t->addrconf_vars[i].data += (char *)p - (char *)&ipv6_devconf;
1da177e4 5289 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
bff16c2f 5290 t->addrconf_vars[i].extra2 = net;
1da177e4 5291 }
1da177e4 5292
6105e293 5293 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name);
1da177e4 5294
6105e293 5295 t->sysctl_header = register_net_sysctl(net, path, t->addrconf_vars);
1da177e4 5296 if (t->sysctl_header == NULL)
6105e293 5297 goto free;
f68635e6
PE		 5298
5299 p->sysctl = t;
95897312 5300 return 0;
1da177e4 5301
f68635e6 5302free:
1da177e4 5303 kfree(t);
f68635e6 5304out:
95897312 5305 return -ENOBUFS;
1da177e4
LT		 5306}
5307
408c4768
PE		 5308static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
5309{
5310 struct addrconf_sysctl_table *t;
5311
5312 if (p->sysctl == NULL)
5313 return;
5314
5315 t = p->sysctl;
5316 p->sysctl = NULL;
ff538818 5317 unregister_net_sysctl_table(t->sysctl_header);
408c4768
PE		 5318 kfree(t);
5319}
5320
a317a2f1 5321static int addrconf_sysctl_register(struct inet6_dev *idev)
f52295a9 5322{
a317a2f1
WC		 5323 int err;
5324
5325 if (!sysctl_dev_name_is_allowed(idev->dev->name))
5326 return -EINVAL;
5327
5328 err = neigh_sysctl_register(idev->dev, idev->nd_parms,
5329 &ndisc_ifinfo_sysctl_change);
5330 if (err)
5331 return err;
5332 err = __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
5333 idev, &idev->cnf);
5334 if (err)
5335 neigh_sysctl_unregister(idev->nd_parms);
5336
5337 return err;
f52295a9
PE		 5338}
5339
408c4768 5340static void addrconf_sysctl_unregister(struct inet6_dev *idev)
1da177e4 5341{
408c4768
PE		 5342 __addrconf_sysctl_unregister(&idev->cnf);
5343 neigh_sysctl_unregister(idev->nd_parms);
1da177e4
LT		 5344}
5345
5346
5347#endif
5348
2c8c1e72 5349static int __net_init addrconf_init_net(struct net *net)
e0da5a48 5350{
a79ca223 5351 int err = -ENOMEM;
e0da5a48
PE		 5352 struct ipv6_devconf *all, *dflt;
5353
a79ca223
HZ		 5354 all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL);
5355 if (all == NULL)
5356 goto err_alloc_all;
e0da5a48 5357
a79ca223
HZ		 5358 dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
5359 if (dflt == NULL)
5360 goto err_alloc_dflt;
e0da5a48 5361
a79ca223
HZ		 5362 /* these will be inherited by all namespaces */
5363 dflt->autoconf = ipv6_defaults.autoconf;
5364 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
e0da5a48
PE		 5365
5366 net->ipv6.devconf_all = all;
5367 net->ipv6.devconf_dflt = dflt;
5368
5369#ifdef CONFIG_SYSCTL
f8572d8f 5370 err = __addrconf_sysctl_register(net, "all", NULL, all);
e0da5a48
PE		 5371 if (err < 0)
5372 goto err_reg_all;
5373
f8572d8f 5374 err = __addrconf_sysctl_register(net, "default", NULL, dflt);
e0da5a48
PE		 5375 if (err < 0)
5376 goto err_reg_dflt;
5377#endif
5378 return 0;
5379
5380#ifdef CONFIG_SYSCTL
5381err_reg_dflt:
5382 __addrconf_sysctl_unregister(all);
5383err_reg_all:
5384 kfree(dflt);
5385#endif
5386err_alloc_dflt:
5387 kfree(all);
5388err_alloc_all:
5389 return err;
5390}
5391
2c8c1e72 5392static void __net_exit addrconf_exit_net(struct net *net)
e0da5a48
PE		 5393{
5394#ifdef CONFIG_SYSCTL
5395 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
5396 __addrconf_sysctl_unregister(net->ipv6.devconf_all);
5397#endif
73cf0e92 5398 kfree(net->ipv6.devconf_dflt);
5399 kfree(net->ipv6.devconf_all);
e0da5a48
PE		 5400}
5401
5402static struct pernet_operations addrconf_ops = {
5403 .init = addrconf_init_net,
5404 .exit = addrconf_exit_net,
5405};
5406
b382b191
TG		 5407static struct rtnl_af_ops inet6_ops = {
5408 .family = AF_INET6,
5409 .fill_link_af = inet6_fill_link_af,
5410 .get_link_af_size = inet6_get_link_af_size,
f53adae4 5411 .set_link_af = inet6_set_link_af,
b382b191
TG		 5412};
5413
1da177e4
LT		 5414/*
5415 * Init / cleanup code
5416 */
5417
5418int __init addrconf_init(void)
5419{
a317a2f1 5420 struct inet6_dev *idev;
c2e21293 5421 int i, err;
2a8cc6c8 5422
e21e8467
SH		 5423 err = ipv6_addr_label_init();
5424 if (err < 0) {
f3213831
JP		 5425 pr_crit("%s: cannot initialize default policy table: %d\n",
5426 __func__, err);
2cc6d2bf 5427 goto out;
2a8cc6c8 5428 }
1da177e4 5429
2cc6d2bf
NH		 5430 err = register_pernet_subsys(&addrconf_ops);
5431 if (err < 0)
5432 goto out_addrlabel;
e0da5a48 5433
c15b1cca
HFS		 5434 addrconf_wq = create_workqueue("ipv6_addrconf");
5435 if (!addrconf_wq) {
5436 err = -ENOMEM;
5437 goto out_nowq;
5438 }
5439
1da177e4
LT		 5440 /* The addrconf netdev notifier requires that loopback_dev
5441 * has it's ipv6 private information allocated and setup
5442 * before it can bring up and give link-local addresses
5443 * to other devices which are up.
5444 *
5445 * Unfortunately, loopback_dev is not necessarily the first
5446 * entry in the global dev_base list of net devices. In fact,
5447 * it is likely to be the very last entry on that list.
5448 * So this causes the notifier registry below to try and
5449 * give link-local addresses to all devices besides loopback_dev
5450 * first, then loopback_dev, which cases all the non-loopback_dev
5451 * devices to fail to get a link-local address.
5452 *
5453 * So, as a temporary fix, allocate the ipv6 structure for
5454 * loopback_dev first by hand.
5455 * Longer term, all of the dependencies ipv6 has upon the loopback
5456 * device and it being up should be removed.
5457 */
5458 rtnl_lock();
a317a2f1 5459 idev = ipv6_add_dev(init_net.loopback_dev);
1da177e4 5460 rtnl_unlock();
a317a2f1
WC		 5461 if (IS_ERR(idev)) {
5462 err = PTR_ERR(idev);
e0da5a48 5463 goto errlo;
a317a2f1 5464 }
1da177e4 5465
c2e21293 5466 for (i = 0; i < IN6_ADDR_HSIZE; i++)
5467 INIT_HLIST_HEAD(&inet6_addr_lst[i]);
5468
1da177e4
LT		 5469 register_netdevice_notifier(&ipv6_dev_notf);
5470
c15b1cca 5471 addrconf_verify();
c127ea2c 5472
3678a9d8 5473 rtnl_af_register(&inet6_ops);
b382b191 5474
c7ac8679
GR		 5475 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo,
5476 NULL);
c127ea2c
TG		 5477 if (err < 0)
5478 goto errout;
5479
5480 /* Only the first call to __rtnl_register can fail */
c7ac8679
GR		 5481 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL, NULL);
5482 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL, NULL);
5483 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr,
5484 inet6_dump_ifaddr, NULL);
5485 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL,
5486 inet6_dump_ifmcaddr, NULL);
5487 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL,
5488 inet6_dump_ifacaddr, NULL);
76f8f6cb 5489 __rtnl_register(PF_INET6, RTM_GETNETCONF, inet6_netconf_get_devconf,
7a674200 5490 inet6_netconf_dump_devconf, NULL);
c127ea2c 5491
2a8cc6c8
YH		 5492 ipv6_addr_label_rtnl_register();
5493
1da177e4 5494 return 0;
c127ea2c 5495errout:
b382b191 5496 rtnl_af_unregister(&inet6_ops);
c127ea2c 5497 unregister_netdevice_notifier(&ipv6_dev_notf);
e0da5a48 5498errlo:
c15b1cca
HFS		 5499 destroy_workqueue(addrconf_wq);
5500out_nowq:
e0da5a48 5501 unregister_pernet_subsys(&addrconf_ops);
2cc6d2bf
NH		 5502out_addrlabel:
5503 ipv6_addr_label_cleanup();
5504out:
c127ea2c 5505 return err;
1da177e4
LT		 5506}
5507
09f7709f 5508void addrconf_cleanup(void)
1da177e4 5509{
176c39af 5510 struct net_device *dev;
1da177e4
LT		 5511 int i;
5512
5513 unregister_netdevice_notifier(&ipv6_dev_notf);
e0da5a48 5514 unregister_pernet_subsys(&addrconf_ops);
2cc6d2bf 5515 ipv6_addr_label_cleanup();
1da177e4
LT		 5516
5517 rtnl_lock();
5518
b382b191
TG		 5519 __rtnl_af_unregister(&inet6_ops);
5520
176c39af
DL		 5521 /* clean dev list */
5522 for_each_netdev(&init_net, dev) {
5523 if (__in6_dev_get(dev) == NULL)
5524 continue;
5525 addrconf_ifdown(dev, 1);
5526 }
5527 addrconf_ifdown(init_net.loopback_dev, 2);
5528
1da177e4
LT		 5529 /*
5530 * Check hash table.
5531 */
5c578aed 5532 spin_lock_bh(&addrconf_hash_lock);
c2e21293 5533 for (i = 0; i < IN6_ADDR_HSIZE; i++)
5534 WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
5c578aed 5535 spin_unlock_bh(&addrconf_hash_lock);
c15b1cca 5536 cancel_delayed_work(&addr_chk_work);
1da177e4 5537 rtnl_unlock();
c15b1cca
HFS		 5538
5539 destroy_workqueue(addrconf_wq);
1da177e4 5540}
Linux 6.x block layer and io_uring tree(s)