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ipv6: avoid unregistering inet6_dev for loopback
[GitHub/mt8127/android_kernel_alcatel_ttab.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
LT		 86
87#ifdef CONFIG_IPV6_PRIVACY
88#include <linux/random.h>
1da177e4
LT		 89#endif
90
e21e8467 91#include <linux/uaccess.h>
7f7d9a6b 92#include <asm/unaligned.h>
1da177e4
LT		 93
94#include <linux/proc_fs.h>
95#include <linux/seq_file.h>
bc3b2d7f 96#include <linux/export.h>
1da177e4
LT		 97
98/* Set to 3 to get tracing... */
99#define ACONF_DEBUG 2
100
101#if ACONF_DEBUG >= 3
102#define ADBG(x) printk x
103#else
104#define ADBG(x)
105#endif
106
107#define INFINITY_LIFE_TIME 0xFFFFFFFF
18a31e1e
TG		 108
109static inline u32 cstamp_delta(unsigned long cstamp)
110{
111 return (cstamp - INITIAL_JIFFIES) * 100UL / HZ;
112}
1da177e4
LT		 113
114#ifdef CONFIG_SYSCTL
f52295a9 115static void addrconf_sysctl_register(struct inet6_dev *idev);
408c4768
PE		 116static void addrconf_sysctl_unregister(struct inet6_dev *idev);
117#else
118static inline void addrconf_sysctl_register(struct inet6_dev *idev)
119{
120}
121
122static inline void addrconf_sysctl_unregister(struct inet6_dev *idev)
123{
124}
1da177e4
LT		 125#endif
126
127#ifdef CONFIG_IPV6_PRIVACY
eb7e0575
SD		 128static void __ipv6_regen_rndid(struct inet6_dev *idev);
129static void __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
1da177e4 130static void ipv6_regen_rndid(unsigned long data);
1da177e4
LT		 131#endif
132
1b34be74 133static int ipv6_generate_eui64(u8 *eui, struct net_device *dev);
1da177e4
LT		 134static int ipv6_count_addresses(struct inet6_dev *idev);
135
136/*
137 * Configured unicast address hash table
138 */
c2e21293 139static struct hlist_head inet6_addr_lst[IN6_ADDR_HSIZE];
5c578aed 140static DEFINE_SPINLOCK(addrconf_hash_lock);
1da177e4 141
835b474b
HFS		 142static void addrconf_verify(void);
143static void addrconf_verify_rtnl(void);
144static void addrconf_verify_work(struct work_struct *);
1da177e4 145
835b474b
HFS		 146static struct workqueue_struct *addrconf_wq;
147static DECLARE_DELAYED_WORK(addr_chk_work, addrconf_verify_work);
1da177e4
LT		 148
149static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
150static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
151
93d9b7d7
JP		 152static void addrconf_type_change(struct net_device *dev,
153 unsigned long event);
1da177e4
LT		 154static int addrconf_ifdown(struct net_device *dev, int how);
155
21caa662
RK		 156static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
157 int plen,
158 const struct net_device *dev,
159 u32 flags, u32 noflags);
160
cf22f9a2 161static void addrconf_dad_start(struct inet6_ifaddr *ifp);
835b474b 162static void addrconf_dad_work(struct work_struct *w);
1da177e4 163static void addrconf_dad_completed(struct inet6_ifaddr *ifp);
c5e33bdd 164static void addrconf_dad_run(struct inet6_dev *idev);
1da177e4
LT		 165static void addrconf_rs_timer(unsigned long data);
166static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
167static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
168
1ab1457c 169static void inet6_prefix_notify(int event, struct inet6_dev *idev,
1da177e4 170 struct prefix_info *pinfo);
3e81c6da
DM		 171static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
172 struct net_device *dev);
1da177e4 173
888c848e 174static struct ipv6_devconf ipv6_devconf __read_mostly = {
1da177e4
LT		 175 .forwarding = 0,
176 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
177 .mtu6 = IPV6_MIN_MTU,
178 .accept_ra = 1,
179 .accept_redirects = 1,
180 .autoconf = 1,
181 .force_mld_version = 0,
182 .dad_transmits = 1,
183 .rtr_solicits = MAX_RTR_SOLICITATIONS,
184 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
185 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
186#ifdef CONFIG_IPV6_PRIVACY
187 .use_tempaddr = 0,
188 .temp_valid_lft = TEMP_VALID_LIFETIME,
189 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
190 .regen_max_retry = REGEN_MAX_RETRY,
191 .max_desync_factor = MAX_DESYNC_FACTOR,
192#endif
193 .max_addresses = IPV6_MAX_ADDRESSES,
65f5c7c1 194 .accept_ra_defrtr = 1,
c4fd30eb 195 .accept_ra_pinfo = 1,
930d6ff2
YH		 196#ifdef CONFIG_IPV6_ROUTER_PREF
197 .accept_ra_rtr_pref = 1,
52e16356 198 .rtr_probe_interval = 60 * HZ,
09c884d4
YH		 199#ifdef CONFIG_IPV6_ROUTE_INFO
200 .accept_ra_rt_info_max_plen = 0,
201#endif
930d6ff2 202#endif
fbea49e1 203 .proxy_ndp = 0,
0bcbc926 204 .accept_source_route = 0, /* we do not accept RH0 by default. */
778d80be 205 .disable_ipv6 = 0,
1b34be74 206 .accept_dad = 1,
1da177e4
LT		 207};
208
ab32ea5d 209static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
1da177e4
LT		 210 .forwarding = 0,
211 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
212 .mtu6 = IPV6_MIN_MTU,
213 .accept_ra = 1,
214 .accept_redirects = 1,
215 .autoconf = 1,
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,
220#ifdef CONFIG_IPV6_PRIVACY
221 .use_tempaddr = 0,
222 .temp_valid_lft = TEMP_VALID_LIFETIME,
223 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
224 .regen_max_retry = REGEN_MAX_RETRY,
225 .max_desync_factor = MAX_DESYNC_FACTOR,
226#endif
227 .max_addresses = IPV6_MAX_ADDRESSES,
65f5c7c1 228 .accept_ra_defrtr = 1,
c4fd30eb 229 .accept_ra_pinfo = 1,
930d6ff2
YH		 230#ifdef CONFIG_IPV6_ROUTER_PREF
231 .accept_ra_rtr_pref = 1,
52e16356 232 .rtr_probe_interval = 60 * HZ,
09c884d4
YH		 233#ifdef CONFIG_IPV6_ROUTE_INFO
234 .accept_ra_rt_info_max_plen = 0,
235#endif
930d6ff2 236#endif
fbea49e1 237 .proxy_ndp = 0,
0bcbc926 238 .accept_source_route = 0, /* we do not accept RH0 by default. */
778d80be 239 .disable_ipv6 = 0,
1b34be74 240 .accept_dad = 1,
1da177e4
LT		 241};
242
243/* IPv6 Wildcard Address and Loopback Address defined by RFC2553 */
1da177e4 244const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT;
1da177e4 245const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT;
f3ee4010
YH		 246const struct in6_addr in6addr_linklocal_allnodes = IN6ADDR_LINKLOCAL_ALLNODES_INIT;
247const struct in6_addr in6addr_linklocal_allrouters = IN6ADDR_LINKLOCAL_ALLROUTERS_INIT;
2c5e8933
HFS		 248const struct in6_addr in6addr_interfacelocal_allnodes = IN6ADDR_INTERFACELOCAL_ALLNODES_INIT;
249const struct in6_addr in6addr_interfacelocal_allrouters = IN6ADDR_INTERFACELOCAL_ALLROUTERS_INIT;
250const struct in6_addr in6addr_sitelocal_allrouters = IN6ADDR_SITELOCAL_ALLROUTERS_INIT;
1da177e4 251
f24e3d65 252/* Check if a valid qdisc is available */
05297949 253static inline bool addrconf_qdisc_ok(const struct net_device *dev)
f24e3d65 254{
05297949 255 return !qdisc_tx_is_noop(dev);
f24e3d65
MC		 256}
257
973d5956 258static void addrconf_del_rs_timer(struct inet6_dev *idev)
1da177e4 259{
973d5956
HFS		 260 if (del_timer(&idev->rs_timer))
261 __in6_dev_put(idev);
262}
263
835b474b 264static void addrconf_del_dad_work(struct inet6_ifaddr *ifp)
973d5956 265{
835b474b 266 if (cancel_delayed_work(&ifp->dad_work))
1da177e4
LT		 267 __in6_ifa_put(ifp);
268}
269
973d5956
HFS		 270static void addrconf_mod_rs_timer(struct inet6_dev *idev,
271 unsigned long when)
272{
273 if (!timer_pending(&idev->rs_timer))
274 in6_dev_hold(idev);
275 mod_timer(&idev->rs_timer, jiffies + when);
276}
1da177e4 277
835b474b
HFS		 278static void addrconf_mod_dad_work(struct inet6_ifaddr *ifp,
279 unsigned long delay)
1da177e4 280{
835b474b 281 if (!delayed_work_pending(&ifp->dad_work))
1da177e4 282 in6_ifa_hold(ifp);
835b474b 283 mod_delayed_work(addrconf_wq, &ifp->dad_work, delay);
1da177e4
LT		 284}
285
7f7d9a6b
HX		 286static int snmp6_alloc_dev(struct inet6_dev *idev)
287{
7d720c3e 288 if (snmp_mib_init((void __percpu **)idev->stats.ipv6,
1823e4c8
ED		 289 sizeof(struct ipstats_mib),
290 __alignof__(struct ipstats_mib)) < 0)
7f7d9a6b 291 goto err_ip;
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:
7d720c3e 306 snmp_mib_free((void __percpu **)idev->stats.ipv6);
7f7d9a6b 307err_ip:
aaf70ec7 308 return -ENOMEM;
7f7d9a6b
HX		 309}
310
16910b98 311static void snmp6_free_dev(struct inet6_dev *idev)
7f7d9a6b 312{
be281e55
ED		 313 kfree(idev->stats.icmpv6msgdev);
314 kfree(idev->stats.icmpv6dev);
7d720c3e 315 snmp_mib_free((void __percpu **)idev->stats.ipv6);
7f7d9a6b
HX		 316}
317
1da177e4
LT		 318/* Nobody refers to this device, we may destroy it. */
319
320void in6_dev_finish_destroy(struct inet6_dev *idev)
321{
322 struct net_device *dev = idev->dev;
547b792c 323
502a2ffd 324 WARN_ON(!list_empty(&idev->addr_list));
547b792c 325 WARN_ON(idev->mc_list != NULL);
973d5956 326 WARN_ON(timer_pending(&idev->rs_timer));
547b792c 327
1da177e4 328#ifdef NET_REFCNT_DEBUG
91df42be 329 pr_debug("%s: %s\n", __func__, dev ? dev->name : "NIL");
1da177e4
LT		 330#endif
331 dev_put(dev);
332 if (!idev->dead) {
f3213831 333 pr_warn("Freeing alive inet6 device %p\n", idev);
1da177e4
LT		 334 return;
335 }
336 snmp6_free_dev(idev);
38f57d1a 337 kfree_rcu(idev, rcu);
1da177e4 338}
7159039a
YH		 339EXPORT_SYMBOL(in6_dev_finish_destroy);
340
8e5e8f30 341static struct inet6_dev *ipv6_add_dev(struct net_device *dev)
1da177e4
LT		 342{
343 struct inet6_dev *ndev;
344
345 ASSERT_RTNL();
346
347 if (dev->mtu < IPV6_MIN_MTU)
348 return NULL;
349
1ab1457c 350 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
322f74a4 351
1ab1457c
YH		 352 if (ndev == NULL)
353 return NULL;
322f74a4
IO		 354
355 rwlock_init(&ndev->lock);
356 ndev->dev = dev;
502a2ffd 357 INIT_LIST_HEAD(&ndev->addr_list);
973d5956
HFS		 358 setup_timer(&ndev->rs_timer, addrconf_rs_timer,
359 (unsigned long)ndev);
c346dca1 360 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf));
322f74a4
IO		 361 ndev->cnf.mtu6 = dev->mtu;
362 ndev->cnf.sysctl = NULL;
363 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
364 if (ndev->nd_parms == NULL) {
365 kfree(ndev);
366 return NULL;
367 }
0187bdfb
BH		 368 if (ndev->cnf.forwarding)
369 dev_disable_lro(dev);
322f74a4
IO		 370 /* We refer to the device */
371 dev_hold(dev);
1da177e4 372
322f74a4
IO		 373 if (snmp6_alloc_dev(ndev) < 0) {
374 ADBG((KERN_WARNING
f3213831 375 "%s: cannot allocate memory for statistics; dev=%s.\n",
0dc47877 376 __func__, dev->name));
322f74a4 377 neigh_parms_release(&nd_tbl, ndev->nd_parms);
8603e33d
RL		 378 dev_put(dev);
379 kfree(ndev);
322f74a4
IO		 380 return NULL;
381 }
1da177e4 382
322f74a4
IO		 383 if (snmp6_register_dev(ndev) < 0) {
384 ADBG((KERN_WARNING
f3213831 385 "%s: cannot create /proc/net/dev_snmp6/%s\n",
0dc47877 386 __func__, dev->name));
322f74a4
IO		 387 neigh_parms_release(&nd_tbl, ndev->nd_parms);
388 ndev->dead = 1;
389 in6_dev_finish_destroy(ndev);
390 return NULL;
391 }
392
393 /* One reference from device. We must do this before
394 * we invoke __ipv6_regen_rndid().
395 */
396 in6_dev_hold(ndev);
1da177e4 397
1b34be74
YH		 398 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
399 ndev->cnf.accept_dad = -1;
400
07a93626 401#if IS_ENABLED(CONFIG_IPV6_SIT)
b077d7ab 402 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
f3213831 403 pr_info("%s: Disabled Multicast RS\n", dev->name);
b077d7ab
YH		 404 ndev->cnf.rtr_solicits = 0;
405 }
406#endif
407
1da177e4 408#ifdef CONFIG_IPV6_PRIVACY
372e6c8f 409 INIT_LIST_HEAD(&ndev->tempaddr_list);
b24b8a24 410 setup_timer(&ndev->regen_timer, ipv6_regen_rndid, (unsigned long)ndev);
322f74a4
IO		 411 if ((dev->flags&IFF_LOOPBACK) ||
412 dev->type == ARPHRD_TUNNEL ||
9625ed72 413 dev->type == ARPHRD_TUNNEL6 ||
0be669bb 414 dev->type == ARPHRD_SIT ||
0be669bb 415 dev->type == ARPHRD_NONE) {
322f74a4
IO		 416 ndev->cnf.use_tempaddr = -1;
417 } else {
418 in6_dev_hold(ndev);
419 ipv6_regen_rndid((unsigned long) ndev);
420 }
1da177e4 421#endif
914faa14 422 ndev->token = in6addr_any;
1da177e4 423
f24e3d65 424 if (netif_running(dev) && addrconf_qdisc_ok(dev))
53aadcc9
HX		 425 ndev->if_flags |= IF_READY;
426
322f74a4
IO		 427 ipv6_mc_init_dev(ndev);
428 ndev->tstamp = jiffies;
f52295a9 429 addrconf_sysctl_register(ndev);
30c4cf57 430 /* protected by rtnl_lock */
cf778b00 431 rcu_assign_pointer(dev->ip6_ptr, ndev);
d88ae4cc 432
2c5e8933
HFS		 433 /* Join interface-local all-node multicast group */
434 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allnodes);
435
d88ae4cc 436 /* Join all-node multicast group */
f3ee4010 437 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);
d88ae4cc 438
d6ddef9e 439 /* Join all-router multicast group if forwarding is set */
8b2aaede 440 if (ndev->cnf.forwarding && (dev->flags & IFF_MULTICAST))
d6ddef9e
LW		 441 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
442
1da177e4
LT		 443 return ndev;
444}
445
8e5e8f30 446static struct inet6_dev *ipv6_find_idev(struct net_device *dev)
1da177e4
LT		 447{
448 struct inet6_dev *idev;
449
450 ASSERT_RTNL();
451
e21e8467
SH		 452 idev = __in6_dev_get(dev);
453 if (!idev) {
454 idev = ipv6_add_dev(dev);
455 if (!idev)
1da177e4
LT		 456 return NULL;
457 }
c5e33bdd 458
1da177e4
LT		 459 if (dev->flags&IFF_UP)
460 ipv6_mc_up(idev);
461 return idev;
462}
463
f3a1bfb1
ND		 464static int inet6_netconf_msgsize_devconf(int type)
465{
466 int size = NLMSG_ALIGN(sizeof(struct netconfmsg))
467 + nla_total_size(4); /* NETCONFA_IFINDEX */
468
76f8f6cb
ND		 469 /* type -1 is used for ALL */
470 if (type == -1 || type == NETCONFA_FORWARDING)
f3a1bfb1 471 size += nla_total_size(4);
b1afce95 472#ifdef CONFIG_IPV6_MROUTE
d67b8c61
ND		 473 if (type == -1 || type == NETCONFA_MC_FORWARDING)
474 size += nla_total_size(4);
b1afce95 475#endif
f3a1bfb1
ND		 476
477 return size;
478}
479
480static int inet6_netconf_fill_devconf(struct sk_buff *skb, int ifindex,
481 struct ipv6_devconf *devconf, u32 portid,
482 u32 seq, int event, unsigned int flags,
483 int type)
484{
485 struct nlmsghdr *nlh;
486 struct netconfmsg *ncm;
487
488 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg),
489 flags);
490 if (nlh == NULL)
491 return -EMSGSIZE;
492
493 ncm = nlmsg_data(nlh);
494 ncm->ncm_family = AF_INET6;
495
496 if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0)
497 goto nla_put_failure;
498
76f8f6cb
ND		 499 /* type -1 is used for ALL */
500 if ((type == -1 || type == NETCONFA_FORWARDING) &&
f3a1bfb1
ND		 501 nla_put_s32(skb, NETCONFA_FORWARDING, devconf->forwarding) < 0)
502 goto nla_put_failure;
b1afce95 503#ifdef CONFIG_IPV6_MROUTE
d67b8c61
ND		 504 if ((type == -1 || type == NETCONFA_MC_FORWARDING) &&
505 nla_put_s32(skb, NETCONFA_MC_FORWARDING,
506 devconf->mc_forwarding) < 0)
507 goto nla_put_failure;
b1afce95 508#endif
f3a1bfb1
ND		 509 return nlmsg_end(skb, nlh);
510
511nla_put_failure:
512 nlmsg_cancel(skb, nlh);
513 return -EMSGSIZE;
514}
515
d67b8c61
ND		 516void inet6_netconf_notify_devconf(struct net *net, int type, int ifindex,
517 struct ipv6_devconf *devconf)
f3a1bfb1
ND		 518{
519 struct sk_buff *skb;
520 int err = -ENOBUFS;
521
522 skb = nlmsg_new(inet6_netconf_msgsize_devconf(type), GFP_ATOMIC);
523 if (skb == NULL)
524 goto errout;
525
526 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 0, 0,
527 RTM_NEWNETCONF, 0, type);
528 if (err < 0) {
529 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
530 WARN_ON(err == -EMSGSIZE);
531 kfree_skb(skb);
532 goto errout;
533 }
534 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_NETCONF, NULL, GFP_ATOMIC);
535 return;
536errout:
bd779028 537 rtnl_set_sk_err(net, RTNLGRP_IPV6_NETCONF, err);
f3a1bfb1
ND		 538}
539
76f8f6cb
ND		 540static const struct nla_policy devconf_ipv6_policy[NETCONFA_MAX+1] = {
541 [NETCONFA_IFINDEX] = { .len = sizeof(int) },
542 [NETCONFA_FORWARDING] = { .len = sizeof(int) },
543};
544
545static int inet6_netconf_get_devconf(struct sk_buff *in_skb,
661d2967 546 struct nlmsghdr *nlh)
76f8f6cb
ND		 547{
548 struct net *net = sock_net(in_skb->sk);
549 struct nlattr *tb[NETCONFA_MAX+1];
550 struct netconfmsg *ncm;
551 struct sk_buff *skb;
552 struct ipv6_devconf *devconf;
553 struct inet6_dev *in6_dev;
554 struct net_device *dev;
555 int ifindex;
556 int err;
557
558 err = nlmsg_parse(nlh, sizeof(*ncm), tb, NETCONFA_MAX,
559 devconf_ipv6_policy);
560 if (err < 0)
561 goto errout;
562
563 err = EINVAL;
564 if (!tb[NETCONFA_IFINDEX])
565 goto errout;
566
567 ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]);
568 switch (ifindex) {
569 case NETCONFA_IFINDEX_ALL:
570 devconf = net->ipv6.devconf_all;
571 break;
572 case NETCONFA_IFINDEX_DEFAULT:
573 devconf = net->ipv6.devconf_dflt;
574 break;
575 default:
576 dev = __dev_get_by_index(net, ifindex);
577 if (dev == NULL)
578 goto errout;
579 in6_dev = __in6_dev_get(dev);
580 if (in6_dev == NULL)
581 goto errout;
582 devconf = &in6_dev->cnf;
583 break;
584 }
585
586 err = -ENOBUFS;
587 skb = nlmsg_new(inet6_netconf_msgsize_devconf(-1), GFP_ATOMIC);
588 if (skb == NULL)
589 goto errout;
590
591 err = inet6_netconf_fill_devconf(skb, ifindex, devconf,
592 NETLINK_CB(in_skb).portid,
593 nlh->nlmsg_seq, RTM_NEWNETCONF, 0,
594 -1);
595 if (err < 0) {
596 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
597 WARN_ON(err == -EMSGSIZE);
598 kfree_skb(skb);
599 goto errout;
600 }
601 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
602errout:
603 return err;
604}
605
7a674200
ND		 606static int inet6_netconf_dump_devconf(struct sk_buff *skb,
607 struct netlink_callback *cb)
608{
609 struct net *net = sock_net(skb->sk);
610 int h, s_h;
611 int idx, s_idx;
612 struct net_device *dev;
613 struct inet6_dev *idev;
614 struct hlist_head *head;
615
616 s_h = cb->args[0];
617 s_idx = idx = cb->args[1];
618
619 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
620 idx = 0;
621 head = &net->dev_index_head[h];
622 rcu_read_lock();
63998ac2
ND		 623 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^
624 net->dev_base_seq;
7a674200
ND		 625 hlist_for_each_entry_rcu(dev, head, index_hlist) {
626 if (idx < s_idx)
627 goto cont;
628 idev = __in6_dev_get(dev);
629 if (!idev)
630 goto cont;
631
632 if (inet6_netconf_fill_devconf(skb, dev->ifindex,
633 &idev->cnf,
634 NETLINK_CB(cb->skb).portid,
635 cb->nlh->nlmsg_seq,
636 RTM_NEWNETCONF,
637 NLM_F_MULTI,
638 -1) <= 0) {
639 rcu_read_unlock();
640 goto done;
641 }
63998ac2 642 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
7a674200
ND		 643cont:
644 idx++;
645 }
646 rcu_read_unlock();
647 }
648 if (h == NETDEV_HASHENTRIES) {
649 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL,
650 net->ipv6.devconf_all,
651 NETLINK_CB(cb->skb).portid,
652 cb->nlh->nlmsg_seq,
653 RTM_NEWNETCONF, NLM_F_MULTI,
654 -1) <= 0)
655 goto done;
656 else
657 h++;
658 }
659 if (h == NETDEV_HASHENTRIES + 1) {
660 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT,
661 net->ipv6.devconf_dflt,
662 NETLINK_CB(cb->skb).portid,
663 cb->nlh->nlmsg_seq,
664 RTM_NEWNETCONF, NLM_F_MULTI,
665 -1) <= 0)
666 goto done;
667 else
668 h++;
669 }
670done:
671 cb->args[0] = h;
672 cb->args[1] = idx;
673
674 return skb->len;
675}
676
1da177e4
LT		 677#ifdef CONFIG_SYSCTL
678static void dev_forward_change(struct inet6_dev *idev)
679{
680 struct net_device *dev;
681 struct inet6_ifaddr *ifa;
1da177e4
LT		 682
683 if (!idev)
684 return;
685 dev = idev->dev;
0187bdfb
BH		 686 if (idev->cnf.forwarding)
687 dev_disable_lro(dev);
1a940835 688 if (dev->flags & IFF_MULTICAST) {
2c5e8933 689 if (idev->cnf.forwarding) {
f3ee4010 690 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
2c5e8933
HFS		 691 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allrouters);
692 ipv6_dev_mc_inc(dev, &in6addr_sitelocal_allrouters);
693 } else {
f3ee4010 694 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
2c5e8933
HFS		 695 ipv6_dev_mc_dec(dev, &in6addr_interfacelocal_allrouters);
696 ipv6_dev_mc_dec(dev, &in6addr_sitelocal_allrouters);
697 }
1da177e4 698 }
502a2ffd 699
700 list_for_each_entry(ifa, &idev->addr_list, if_list) {
2c12a74c
MW		 701 if (ifa->flags&IFA_F_TENTATIVE)
702 continue;
1da177e4
LT		 703 if (idev->cnf.forwarding)
704 addrconf_join_anycast(ifa);
705 else
706 addrconf_leave_anycast(ifa);
707 }
f3a1bfb1
ND		 708 inet6_netconf_notify_devconf(dev_net(dev), NETCONFA_FORWARDING,
709 dev->ifindex, &idev->cnf);
1da177e4
LT		 710}
711
712
e186932b 713static void addrconf_forward_change(struct net *net, __s32 newf)
1da177e4
LT		 714{
715 struct net_device *dev;
716 struct inet6_dev *idev;
717
4acd4945 718 for_each_netdev(net, dev) {
1da177e4
LT		 719 idev = __in6_dev_get(dev);
720 if (idev) {
e186932b
PE		 721 int changed = (!idev->cnf.forwarding) ^ (!newf);
722 idev->cnf.forwarding = newf;
1da177e4
LT		 723 if (changed)
724 dev_forward_change(idev);
725 }
1da177e4 726 }
1da177e4 727}
c8fecf22 728
013d97e9 729static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf)
c8fecf22 730{
bff16c2f 731 struct net *net;
013d97e9
FR		 732 int old;
733
734 if (!rtnl_trylock())
735 return restart_syscall();
bff16c2f
PE		 736
737 net = (struct net *)table->extra2;
013d97e9
FR		 738 old = *p;
739 *p = newf;
b325fddb 740
013d97e9 741 if (p == &net->ipv6.devconf_dflt->forwarding) {
f3a1bfb1
ND		 742 if ((!newf) ^ (!old))
743 inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING,
744 NETCONFA_IFINDEX_DEFAULT,
745 net->ipv6.devconf_dflt);
013d97e9
FR		 746 rtnl_unlock();
747 return 0;
88af182e 748 }
c8fecf22 749
e186932b 750 if (p == &net->ipv6.devconf_all->forwarding) {
e186932b
PE		 751 net->ipv6.devconf_dflt->forwarding = newf;
752 addrconf_forward_change(net, newf);
f3a1bfb1
ND		 753 if ((!newf) ^ (!old))
754 inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING,
755 NETCONFA_IFINDEX_ALL,
756 net->ipv6.devconf_all);
013d97e9 757 } else if ((!newf) ^ (!old))
c8fecf22 758 dev_forward_change((struct inet6_dev *)table->extra1);
0187bdfb 759 rtnl_unlock();
c8fecf22 760
013d97e9 761 if (newf)
7b4da532 762 rt6_purge_dflt_routers(net);
b325fddb 763 return 1;
c8fecf22 764}
1da177e4
LT		 765#endif
766
5c578aed 767/* Nobody refers to this ifaddr, destroy it */
1da177e4
LT		 768void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
769{
c2e21293 770 WARN_ON(!hlist_unhashed(&ifp->addr_lst));
547b792c 771
1da177e4 772#ifdef NET_REFCNT_DEBUG
91df42be 773 pr_debug("%s\n", __func__);
1da177e4
LT		 774#endif
775
776 in6_dev_put(ifp->idev);
777
835b474b
HFS		 778 if (cancel_delayed_work(&ifp->dad_work))
779 pr_notice("delayed DAD work was pending while freeing ifa=%p\n",
780 ifp);
1da177e4 781
e9d3e084 782 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
f3213831 783 pr_warn("Freeing alive inet6 address %p\n", ifp);
1da177e4
LT		 784 return;
785 }
94e187c0 786 ip6_rt_put(ifp->rt);
1da177e4 787
e5785985 788 kfree_rcu(ifp, rcu);
1da177e4
LT		 789}
790
e55ffac6
BH		 791static void
792ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
793{
502a2ffd 794 struct list_head *p;
8a6ce0c0 795 int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
e55ffac6
BH		 796
797 /*
798 * Each device address list is sorted in order of scope -
799 * global before linklocal.
800 */
502a2ffd 801 list_for_each(p, &idev->addr_list) {
802 struct inet6_ifaddr *ifa
803 = list_entry(p, struct inet6_ifaddr, if_list);
8a6ce0c0 804 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
e55ffac6
BH		 805 break;
806 }
807
b54c9b98 808 list_add_tail(&ifp->if_list, p);
e55ffac6
BH		 809}
810
ddbe5032 811static u32 inet6_addr_hash(const struct in6_addr *addr)
3eb84f49 812{
ddbe5032 813 return hash_32(ipv6_addr_hash(addr), IN6_ADDR_HSIZE_SHIFT);
3eb84f49
YH		 814}
815
1da177e4
LT		 816/* On success it returns ifp with increased reference count */
817
818static struct inet6_ifaddr *
819ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, int pfxlen,
e431b8c0 820 int scope, u32 flags)
1da177e4
LT		 821{
822 struct inet6_ifaddr *ifa = NULL;
823 struct rt6_info *rt;
3a88a81d 824 unsigned int hash;
1da177e4 825 int err = 0;
d68b8270
YH		 826 int addr_type = ipv6_addr_type(addr);
827
828 if (addr_type == IPV6_ADDR_ANY ||
829 addr_type & IPV6_ADDR_MULTICAST ||
830 (!(idev->dev->flags & IFF_LOOPBACK) &&
831 addr_type & IPV6_ADDR_LOOPBACK))
832 return ERR_PTR(-EADDRNOTAVAIL);
1da177e4 833
8814c4b5 834 rcu_read_lock_bh();
1da177e4
LT		 835 if (idev->dead) {
836 err = -ENODEV; /*XXX*/
837 goto out2;
838 }
839
56d417b1 840 if (idev->cnf.disable_ipv6) {
9bdd8d40
BH		 841 err = -EACCES;
842 goto out2;
843 }
844
5c578aed 845 spin_lock(&addrconf_hash_lock);
1da177e4
LT		 846
847 /* Ignore adding duplicate addresses on an interface */
c346dca1 848 if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) {
1da177e4
LT		 849 ADBG(("ipv6_add_addr: already assigned\n"));
850 err = -EEXIST;
851 goto out;
852 }
853
322f74a4 854 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
1da177e4
LT		 855
856 if (ifa == NULL) {
857 ADBG(("ipv6_add_addr: malloc failed\n"));
858 err = -ENOBUFS;
859 goto out;
860 }
861
8f031519 862 rt = addrconf_dst_alloc(idev, addr, false);
1da177e4
LT		 863 if (IS_ERR(rt)) {
864 err = PTR_ERR(rt);
865 goto out;
866 }
867
4e3fd7a0 868 ifa->addr = *addr;
1da177e4
LT		 869
870 spin_lock_init(&ifa->lock);
e9d3e084 871 spin_lock_init(&ifa->state_lock);
835b474b 872 INIT_DELAYED_WORK(&ifa->dad_work, addrconf_dad_work);
c2e21293 873 INIT_HLIST_NODE(&ifa->addr_lst);
1da177e4
LT		 874 ifa->scope = scope;
875 ifa->prefix_len = pfxlen;
876 ifa->flags = flags | IFA_F_TENTATIVE;
877 ifa->cstamp = ifa->tstamp = jiffies;
617fe29d 878 ifa->tokenized = false;
1da177e4 879
57f5f544
KF		 880 ifa->rt = rt;
881
1da177e4
LT		 882 ifa->idev = idev;
883 in6_dev_hold(idev);
884 /* For caller */
885 in6_ifa_hold(ifa);
886
887 /* Add to big hash table */
ddbe5032 888 hash = inet6_addr_hash(addr);
1da177e4 889
5c578aed 890 hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]);
5c578aed 891 spin_unlock(&addrconf_hash_lock);
1da177e4
LT		 892
893 write_lock(&idev->lock);
894 /* Add to inet6_dev unicast addr list. */
e55ffac6 895 ipv6_link_dev_addr(idev, ifa);
1da177e4
LT		 896
897#ifdef CONFIG_IPV6_PRIVACY
898 if (ifa->flags&IFA_F_TEMPORARY) {
372e6c8f 899 list_add(&ifa->tmp_list, &idev->tempaddr_list);
1da177e4
LT		 900 in6_ifa_hold(ifa);
901 }
902#endif
903
1da177e4
LT		 904 in6_ifa_hold(ifa);
905 write_unlock(&idev->lock);
906out2:
8814c4b5 907 rcu_read_unlock_bh();
1da177e4 908
fd92833a 909 if (likely(err == 0))
f88c91dd 910 inet6addr_notifier_call_chain(NETDEV_UP, ifa);
1da177e4
LT		 911 else {
912 kfree(ifa);
913 ifa = ERR_PTR(err);
914 }
915
916 return ifa;
917out:
5c578aed 918 spin_unlock(&addrconf_hash_lock);
1da177e4
LT		 919 goto out2;
920}
921
922/* This function wants to get referenced ifp and releases it before return */
923
924static void ipv6_del_addr(struct inet6_ifaddr *ifp)
925{
502a2ffd 926 struct inet6_ifaddr *ifa, *ifn;
1da177e4 927 struct inet6_dev *idev = ifp->idev;
4c5ff6a6 928 int state;
1da177e4
LT		 929 int deleted = 0, onlink = 0;
930 unsigned long expires = jiffies;
931
835b474b
HFS		 932 ASSERT_RTNL();
933
4c5ff6a6
HX		 934 spin_lock_bh(&ifp->state_lock);
935 state = ifp->state;
e9d3e084 936 ifp->state = INET6_IFADDR_STATE_DEAD;
4c5ff6a6
HX		 937 spin_unlock_bh(&ifp->state_lock);
938
939 if (state == INET6_IFADDR_STATE_DEAD)
940 goto out;
1da177e4 941
5c578aed 942 spin_lock_bh(&addrconf_hash_lock);
943 hlist_del_init_rcu(&ifp->addr_lst);
5c578aed 944 spin_unlock_bh(&addrconf_hash_lock);
1da177e4
LT		 945
946 write_lock_bh(&idev->lock);
947#ifdef CONFIG_IPV6_PRIVACY
948 if (ifp->flags&IFA_F_TEMPORARY) {
372e6c8f 949 list_del(&ifp->tmp_list);
950 if (ifp->ifpub) {
951 in6_ifa_put(ifp->ifpub);
952 ifp->ifpub = NULL;
1da177e4 953 }
372e6c8f 954 __in6_ifa_put(ifp);
1da177e4
LT		 955 }
956#endif
957
502a2ffd 958 list_for_each_entry_safe(ifa, ifn, &idev->addr_list, if_list) {
1da177e4 959 if (ifa == ifp) {
502a2ffd 960 list_del_init(&ifp->if_list);
1da177e4 961 __in6_ifa_put(ifp);
502a2ffd 962
1da177e4
LT		 963 if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0)
964 break;
965 deleted = 1;
1d142804 966 continue;
1da177e4
LT		 967 } else if (ifp->flags & IFA_F_PERMANENT) {
968 if (ipv6_prefix_equal(&ifa->addr, &ifp->addr,
969 ifp->prefix_len)) {
970 if (ifa->flags & IFA_F_PERMANENT) {
971 onlink = 1;
972 if (deleted)
973 break;
974 } else {
975 unsigned long lifetime;
976
977 if (!onlink)
978 onlink = -1;
979
980 spin_lock(&ifa->lock);
4bed72e4
YH		 981
982 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
983 /*
984 * Note: Because this address is
985 * not permanent, lifetime <
986 * LONG_MAX / HZ here.
987 */
1da177e4
LT		 988 if (time_before(expires,
989 ifa->tstamp + lifetime * HZ))
990 expires = ifa->tstamp + lifetime * HZ;
991 spin_unlock(&ifa->lock);
992 }
993 }
994 }
995 }
996 write_unlock_bh(&idev->lock);
997
835b474b 998 addrconf_del_dad_work(ifp);
b2238566 999
1da177e4
LT		 1000 ipv6_ifa_notify(RTM_DELADDR, ifp);
1001
f88c91dd 1002 inet6addr_notifier_call_chain(NETDEV_DOWN, ifp);
1da177e4 1003
1da177e4
LT		 1004 /*
1005 * Purge or update corresponding prefix
1006 *
1007 * 1) we don't purge prefix here if address was not permanent.
1008 * prefix is managed by its own lifetime.
1009 * 2) if there're no addresses, delete prefix.
1010 * 3) if there're still other permanent address(es),
1011 * corresponding prefix is still permanent.
1012 * 4) otherwise, update prefix lifetime to the
1013 * longest valid lifetime among the corresponding
1014 * addresses on the device.
1015 * Note: subsequent RA will update lifetime.
1016 *
1017 * --yoshfuji
1018 */
1019 if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) {
1020 struct in6_addr prefix;
1021 struct rt6_info *rt;
64c6d08e 1022
1da177e4 1023 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len);
1da177e4 1024
21caa662
RK		 1025 rt = addrconf_get_prefix_route(&prefix,
1026 ifp->prefix_len,
1027 ifp->idev->dev,
1028 0, RTF_GATEWAY | RTF_DEFAULT);
1029
1030 if (rt) {
1da177e4 1031 if (onlink == 0) {
e0a1ad73 1032 ip6_del_rt(rt);
1da177e4
LT		 1033 rt = NULL;
1034 } else if (!(rt->rt6i_flags & RTF_EXPIRES)) {
1716a961 1035 rt6_set_expires(rt, expires);
1da177e4
LT		 1036 }
1037 }
94e187c0 1038 ip6_rt_put(rt);
1da177e4
LT		 1039 }
1040
c3968a85
DW		 1041 /* clean up prefsrc entries */
1042 rt6_remove_prefsrc(ifp);
4c5ff6a6 1043out:
1da177e4
LT		 1044 in6_ifa_put(ifp);
1045}
1046
1047#ifdef CONFIG_IPV6_PRIVACY
1048static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
1049{
1050 struct inet6_dev *idev = ifp->idev;
1051 struct in6_addr addr, *tmpaddr;
76f793e3 1052 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_tstamp, age;
eac55bf9 1053 unsigned long regen_advance;
1da177e4
LT		 1054 int tmp_plen;
1055 int ret = 0;
1056 int max_addresses;
95c385b4 1057 u32 addr_flags;
76f793e3 1058 unsigned long now = jiffies;
1da177e4
LT		 1059
1060 write_lock(&idev->lock);
1061 if (ift) {
1062 spin_lock_bh(&ift->lock);
1063 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
1064 spin_unlock_bh(&ift->lock);
1065 tmpaddr = &addr;
1066 } else {
1067 tmpaddr = NULL;
1068 }
1069retry:
1070 in6_dev_hold(idev);
1071 if (idev->cnf.use_tempaddr <= 0) {
1072 write_unlock(&idev->lock);
f3213831 1073 pr_info("%s: use_tempaddr is disabled\n", __func__);
1da177e4
LT		 1074 in6_dev_put(idev);
1075 ret = -1;
1076 goto out;
1077 }
1078 spin_lock_bh(&ifp->lock);
1079 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
1080 idev->cnf.use_tempaddr = -1; /*XXX*/
1081 spin_unlock_bh(&ifp->lock);
1082 write_unlock(&idev->lock);
f3213831
JP		 1083 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n",
1084 __func__);
1da177e4
LT		 1085 in6_dev_put(idev);
1086 ret = -1;
1087 goto out;
1088 }
1089 in6_ifa_hold(ifp);
1090 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
eb7e0575 1091 __ipv6_try_regen_rndid(idev, tmpaddr);
1da177e4 1092 memcpy(&addr.s6_addr[8], idev->rndid, 8);
76f793e3 1093 age = (now - ifp->tstamp) / HZ;
1da177e4
LT		 1094 tmp_valid_lft = min_t(__u32,
1095 ifp->valid_lft,
7a876b0e 1096 idev->cnf.temp_valid_lft + age);
1ab1457c
YH		 1097 tmp_prefered_lft = min_t(__u32,
1098 ifp->prefered_lft,
7a876b0e 1099 idev->cnf.temp_prefered_lft + age -
784e2710 1100 idev->cnf.max_desync_factor);
1da177e4
LT		 1101 tmp_plen = ifp->prefix_len;
1102 max_addresses = idev->cnf.max_addresses;
1da177e4
LT		 1103 tmp_tstamp = ifp->tstamp;
1104 spin_unlock_bh(&ifp->lock);
1105
eac55bf9
BB		 1106 regen_advance = idev->cnf.regen_max_retry *
1107 idev->cnf.dad_transmits *
1108 idev->nd_parms->retrans_time / HZ;
1da177e4 1109 write_unlock(&idev->lock);
95c385b4 1110
eac55bf9
BB		 1111 /* A temporary address is created only if this calculated Preferred
1112 * Lifetime is greater than REGEN_ADVANCE time units. In particular,
1113 * an implementation must not create a temporary address with a zero
1114 * Preferred Lifetime.
9b12db3d
HK		 1115 * Use age calculation as in addrconf_verify to avoid unnecessary
1116 * temporary addresses being generated.
eac55bf9 1117 */
9b12db3d
HK		 1118 age = (now - tmp_tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
1119 if (tmp_prefered_lft <= regen_advance + age) {
eac55bf9
BB		 1120 in6_ifa_put(ifp);
1121 in6_dev_put(idev);
1122 ret = -1;
1123 goto out;
1124 }
1125
95c385b4
NH		 1126 addr_flags = IFA_F_TEMPORARY;
1127 /* set in addrconf_prefix_rcv() */
1128 if (ifp->flags & IFA_F_OPTIMISTIC)
1129 addr_flags |= IFA_F_OPTIMISTIC;
1130
ad558a29
HFS		 1131 ift = ipv6_add_addr(idev, &addr, tmp_plen,
1132 ipv6_addr_type(&addr)&IPV6_ADDR_SCOPE_MASK,
1133 addr_flags);
1134 if (IS_ERR(ift)) {
1da177e4
LT		 1135 in6_ifa_put(ifp);
1136 in6_dev_put(idev);
f3213831 1137 pr_info("%s: retry temporary address regeneration\n", __func__);
1da177e4
LT		 1138 tmpaddr = &addr;
1139 write_lock(&idev->lock);
1140 goto retry;
1141 }
1142
1143 spin_lock_bh(&ift->lock);
1144 ift->ifpub = ifp;
1145 ift->valid_lft = tmp_valid_lft;
1146 ift->prefered_lft = tmp_prefered_lft;
76f793e3 1147 ift->cstamp = now;
1da177e4
LT		 1148 ift->tstamp = tmp_tstamp;
1149 spin_unlock_bh(&ift->lock);
1150
cf22f9a2 1151 addrconf_dad_start(ift);
1da177e4
LT		 1152 in6_ifa_put(ift);
1153 in6_dev_put(idev);
1154out:
1155 return ret;
1156}
1157#endif
1158
1159/*
072047e4 1160 * Choose an appropriate source address (RFC3484)
1da177e4 1161 */
a9b05723
YH		 1162enum {
1163 IPV6_SADDR_RULE_INIT = 0,
1164 IPV6_SADDR_RULE_LOCAL,
1165 IPV6_SADDR_RULE_SCOPE,
1166 IPV6_SADDR_RULE_PREFERRED,
1167#ifdef CONFIG_IPV6_MIP6
1168 IPV6_SADDR_RULE_HOA,
1169#endif
1170 IPV6_SADDR_RULE_OIF,
1171 IPV6_SADDR_RULE_LABEL,
1172#ifdef CONFIG_IPV6_PRIVACY
1173 IPV6_SADDR_RULE_PRIVACY,
1174#endif
1175 IPV6_SADDR_RULE_ORCHID,
1176 IPV6_SADDR_RULE_PREFIX,
1177 IPV6_SADDR_RULE_MAX
1178};
1179
072047e4 1180struct ipv6_saddr_score {
a9b05723
YH		 1181 int rule;
1182 int addr_type;
1183 struct inet6_ifaddr *ifa;
1184 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
1185 int scopedist;
1186 int matchlen;
072047e4
YH		 1187};
1188
a9b05723 1189struct ipv6_saddr_dst {
9acd9f3a 1190 const struct in6_addr *addr;
a9b05723
YH		 1191 int ifindex;
1192 int scope;
1193 int label;
7cbca67c 1194 unsigned int prefs;
a9b05723 1195};
072047e4 1196
b6f99a21 1197static inline int ipv6_saddr_preferred(int type)
1da177e4 1198{
45bb0060 1199 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
072047e4
YH		 1200 return 1;
1201 return 0;
1da177e4
LT		 1202}
1203
3de23255
BT		 1204static int ipv6_get_saddr_eval(struct net *net,
1205 struct ipv6_saddr_score *score,
a9b05723
YH		 1206 struct ipv6_saddr_dst *dst,
1207 int i)
1208{
1209 int ret;
1210
1211 if (i <= score->rule) {
1212 switch (i) {
1213 case IPV6_SADDR_RULE_SCOPE:
1214 ret = score->scopedist;
1215 break;
1216 case IPV6_SADDR_RULE_PREFIX:
1217 ret = score->matchlen;
1218 break;
1219 default:
1220 ret = !!test_bit(i, score->scorebits);
1221 }
1222 goto out;
1223 }
1224
1225 switch (i) {
1226 case IPV6_SADDR_RULE_INIT:
1227 /* Rule 0: remember if hiscore is not ready yet */
1228 ret = !!score->ifa;
1229 break;
1230 case IPV6_SADDR_RULE_LOCAL:
1231 /* Rule 1: Prefer same address */
1232 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1233 break;
1234 case IPV6_SADDR_RULE_SCOPE:
1235 /* Rule 2: Prefer appropriate scope
1236 *
1237 * ret
1238 * ^
1239 * -1 | d 15
1240 * ---+--+-+---> scope
1241 * |
1242 * | d is scope of the destination.
1243 * B-d | \
1244 * | \ <- smaller scope is better if
1245 * B-15 | \ if scope is enough for destinaion.
1246 * | ret = B - scope (-1 <= scope >= d <= 15).
1247 * d-C-1 | /
1248 * |/ <- greater is better
1249 * -C / if scope is not enough for destination.
1250 * /| ret = scope - C (-1 <= d < scope <= 15).
1251 *
1252 * d - C - 1 < B -15 (for all -1 <= d <= 15).
1253 * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1254 * Assume B = 0 and we get C > 29.
1255 */
1256 ret = __ipv6_addr_src_scope(score->addr_type);
1257 if (ret >= dst->scope)
1258 ret = -ret;
1259 else
1260 ret -= 128; /* 30 is enough */
1261 score->scopedist = ret;
1262 break;
1263 case IPV6_SADDR_RULE_PREFERRED:
1264 /* Rule 3: Avoid deprecated and optimistic addresses */
1265 ret = ipv6_saddr_preferred(score->addr_type) ||
1266 !(score->ifa->flags & (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC));
1267 break;
1268#ifdef CONFIG_IPV6_MIP6
1269 case IPV6_SADDR_RULE_HOA:
7cbca67c 1270 {
a9b05723 1271 /* Rule 4: Prefer home address */
7cbca67c
YH		 1272 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1273 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
a9b05723 1274 break;
7cbca67c 1275 }
a9b05723
YH		 1276#endif
1277 case IPV6_SADDR_RULE_OIF:
1278 /* Rule 5: Prefer outgoing interface */
1279 ret = (!dst->ifindex ||
1280 dst->ifindex == score->ifa->idev->dev->ifindex);
1281 break;
1282 case IPV6_SADDR_RULE_LABEL:
1283 /* Rule 6: Prefer matching label */
3de23255
BT		 1284 ret = ipv6_addr_label(net,
1285 &score->ifa->addr, score->addr_type,
a9b05723
YH		 1286 score->ifa->idev->dev->ifindex) == dst->label;
1287 break;
1288#ifdef CONFIG_IPV6_PRIVACY
1289 case IPV6_SADDR_RULE_PRIVACY:
7cbca67c 1290 {
a9b05723 1291 /* Rule 7: Prefer public address
25985edc 1292 * Note: prefer temporary address if use_tempaddr >= 2
a9b05723 1293 */
7cbca67c
YH		 1294 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1295 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1296 score->ifa->idev->cnf.use_tempaddr >= 2;
1297 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
a9b05723 1298 break;
7cbca67c 1299 }
a9b05723
YH		 1300#endif
1301 case IPV6_SADDR_RULE_ORCHID:
1302 /* Rule 8-: Prefer ORCHID vs ORCHID or
1303 * non-ORCHID vs non-ORCHID
1304 */
1305 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1306 ipv6_addr_orchid(dst->addr));
1307 break;
1308 case IPV6_SADDR_RULE_PREFIX:
1309 /* Rule 8: Use longest matching prefix */
91b4b04f
YH		 1310 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr);
1311 if (ret > score->ifa->prefix_len)
1312 ret = score->ifa->prefix_len;
1313 score->matchlen = ret;
a9b05723
YH		 1314 break;
1315 default:
1316 ret = 0;
1317 }
1318
1319 if (ret)
1320 __set_bit(i, score->scorebits);
1321 score->rule = i;
1322out:
1323 return ret;
1324}
1325
b3f644fc 1326int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev,
9acd9f3a 1327 const struct in6_addr *daddr, unsigned int prefs,
7cbca67c 1328 struct in6_addr *saddr)
1da177e4 1329{
a9b05723
YH		 1330 struct ipv6_saddr_score scores[2],
1331 *score = &scores[0], *hiscore = &scores[1];
a9b05723 1332 struct ipv6_saddr_dst dst;
072047e4 1333 struct net_device *dev;
a9b05723 1334 int dst_type;
1da177e4 1335
a9b05723
YH		 1336 dst_type = __ipv6_addr_type(daddr);
1337 dst.addr = daddr;
1338 dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1339 dst.scope = __ipv6_addr_src_scope(dst_type);
3de23255 1340 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
7cbca67c 1341 dst.prefs = prefs;
a9b05723
YH		 1342
1343 hiscore->rule = -1;
1344 hiscore->ifa = NULL;
1da177e4 1345
8814c4b5 1346 rcu_read_lock();
1da177e4 1347
c6d14c84 1348 for_each_netdev_rcu(net, dev) {
072047e4 1349 struct inet6_dev *idev;
072047e4 1350
a9b05723 1351 /* Candidate Source Address (section 4)
072047e4
YH		 1352 * - multicast and link-local destination address,
1353 * the set of candidate source address MUST only
1354 * include addresses assigned to interfaces
1355 * belonging to the same link as the outgoing
1356 * interface.
1357 * (- For site-local destination addresses, the
1358 * set of candidate source addresses MUST only
1359 * include addresses assigned to interfaces
1360 * belonging to the same site as the outgoing
1361 * interface.)
1362 */
a9b05723
YH		 1363 if (((dst_type & IPV6_ADDR_MULTICAST) ||
1364 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL) &&
1365 dst.ifindex && dev->ifindex != dst.ifindex)
072047e4 1366 continue;
1da177e4 1367
1da177e4 1368 idev = __in6_dev_get(dev);
072047e4
YH		 1369 if (!idev)
1370 continue;
1371
1372 read_lock_bh(&idev->lock);
502a2ffd 1373 list_for_each_entry(score->ifa, &idev->addr_list, if_list) {
a9b05723 1374 int i;
072047e4 1375
a9b05723 1376 /*
6b3ae80a
YH		 1377 * - Tentative Address (RFC2462 section 5.4)
1378 * - A tentative address is not considered
1379 * "assigned to an interface" in the traditional
95c385b4 1380 * sense, unless it is also flagged as optimistic.
6b3ae80a 1381 * - Candidate Source Address (section 4)
072047e4
YH		 1382 * - In any case, anycast addresses, multicast
1383 * addresses, and the unspecified address MUST
1384 * NOT be included in a candidate set.
1385 */
a9b05723
YH		 1386 if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1387 (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
6b3ae80a 1388 continue;
a9b05723
YH		 1389
1390 score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1391
1392 if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1393 score->addr_type & IPV6_ADDR_MULTICAST)) {
072047e4 1394 LIMIT_NETDEBUG(KERN_DEBUG
3b6d821c 1395 "ADDRCONF: unspecified / multicast address "
072047e4
YH		 1396 "assigned as unicast address on %s",
1397 dev->name);
1398 continue;
1399 }
1400
a9b05723
YH		 1401 score->rule = -1;
1402 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1403
1404 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1405 int minihiscore, miniscore;
1406
3de23255
BT		 1407 minihiscore = ipv6_get_saddr_eval(net, hiscore, &dst, i);
1408 miniscore = ipv6_get_saddr_eval(net, score, &dst, i);
a9b05723
YH		 1409
1410 if (minihiscore > miniscore) {
1411 if (i == IPV6_SADDR_RULE_SCOPE &&
1412 score->scopedist > 0) {
1413 /*
1414 * special case:
1415 * each remaining entry
1416 * has too small (not enough)
1417 * scope, because ifa entries
1418 * are sorted by their scope
1419 * values.
1420 */
1421 goto try_nextdev;
1422 }
1423 break;
1424 } else if (minihiscore < miniscore) {
a9b05723
YH		 1425 if (hiscore->ifa)
1426 in6_ifa_put(hiscore->ifa);
1427
1428 in6_ifa_hold(score->ifa);
1429
a0bffffc 1430 swap(hiscore, score);
a9b05723
YH		 1431
1432 /* restore our iterator */
1433 score->ifa = hiscore->ifa;
1434
1435 break;
1da177e4 1436 }
072047e4 1437 }
1da177e4 1438 }
a9b05723 1439try_nextdev:
072047e4 1440 read_unlock_bh(&idev->lock);
1da177e4 1441 }
8814c4b5 1442 rcu_read_unlock();
1da177e4 1443
a9b05723 1444 if (!hiscore->ifa)
072047e4 1445 return -EADDRNOTAVAIL;
1ab1457c 1446
4e3fd7a0 1447 *saddr = hiscore->ifa->addr;
a9b05723 1448 in6_ifa_put(hiscore->ifa);
072047e4 1449 return 0;
1da177e4 1450}
5e5f3f0f 1451EXPORT_SYMBOL(ipv6_dev_get_saddr);
1da177e4 1452
36bddbad
AW		 1453int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr,
1454 unsigned char banned_flags)
1455{
1456 struct inet6_ifaddr *ifp;
1457 int err = -EADDRNOTAVAIL;
1458
1459 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1460 if (ifp->scope == IFA_LINK &&
1461 !(ifp->flags & banned_flags)) {
1462 *addr = ifp->addr;
1463 err = 0;
1464 break;
1465 }
1466 }
1467 return err;
1468}
1469
95c385b4
NH		 1470int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1471 unsigned char banned_flags)
1da177e4
LT		 1472{
1473 struct inet6_dev *idev;
1474 int err = -EADDRNOTAVAIL;
1475
8814c4b5 1476 rcu_read_lock();
e21e8467
SH		 1477 idev = __in6_dev_get(dev);
1478 if (idev) {
1da177e4 1479 read_lock_bh(&idev->lock);
36bddbad 1480 err = __ipv6_get_lladdr(idev, addr, banned_flags);
1da177e4
LT		 1481 read_unlock_bh(&idev->lock);
1482 }
8814c4b5 1483 rcu_read_unlock();
1da177e4
LT		 1484 return err;
1485}
1486
1487static int ipv6_count_addresses(struct inet6_dev *idev)
1488{
1489 int cnt = 0;
1490 struct inet6_ifaddr *ifp;
1491
1492 read_lock_bh(&idev->lock);
502a2ffd 1493 list_for_each_entry(ifp, &idev->addr_list, if_list)
1da177e4
LT		 1494 cnt++;
1495 read_unlock_bh(&idev->lock);
1496 return cnt;
1497}
1498
b71d1d42 1499int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
2a7851bf 1500 const struct net_device *dev, int strict)
1da177e4 1501{
eedf042a 1502 struct inet6_ifaddr *ifp;
ddbe5032 1503 unsigned int hash = inet6_addr_hash(addr);
1da177e4 1504
5c578aed 1505 rcu_read_lock_bh();
b67bfe0d 1506 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
878628fb 1507 if (!net_eq(dev_net(ifp->idev->dev), net))
bfeade08 1508 continue;
1da177e4 1509 if (ipv6_addr_equal(&ifp->addr, addr) &&
eedf042a
SH		 1510 !(ifp->flags&IFA_F_TENTATIVE) &&
1511 (dev == NULL || ifp->idev->dev == dev ||
1512 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) {
1513 rcu_read_unlock_bh();
1514 return 1;
1da177e4
LT		 1515 }
1516 }
5c578aed 1517
eedf042a
SH		 1518 rcu_read_unlock_bh();
1519 return 0;
1da177e4 1520}
7159039a
YH		 1521EXPORT_SYMBOL(ipv6_chk_addr);
1522
3e81c6da
DM		 1523static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1524 struct net_device *dev)
1da177e4 1525{
ddbe5032 1526 unsigned int hash = inet6_addr_hash(addr);
c2e21293 1527 struct inet6_ifaddr *ifp;
1da177e4 1528
b67bfe0d 1529 hlist_for_each_entry(ifp, &inet6_addr_lst[hash], addr_lst) {
878628fb 1530 if (!net_eq(dev_net(ifp->idev->dev), net))
06bfe655 1531 continue;
1da177e4
LT		 1532 if (ipv6_addr_equal(&ifp->addr, addr)) {
1533 if (dev == NULL || ifp->idev->dev == dev)
3e81c6da 1534 return true;
1da177e4
LT		 1535 }
1536 }
3e81c6da 1537 return false;
1da177e4
LT		 1538}
1539
6ea2edb3
CB		 1540/* Compares an address/prefix_len with addresses on device @dev.
1541 * If one is found it returns true.
1542 */
1543bool ipv6_chk_custom_prefix(const struct in6_addr *addr,
1544 const unsigned int prefix_len, struct net_device *dev)
1545{
1546 struct inet6_dev *idev;
1547 struct inet6_ifaddr *ifa;
1548 bool ret = false;
1549
1550 rcu_read_lock();
1551 idev = __in6_dev_get(dev);
1552 if (idev) {
1553 read_lock_bh(&idev->lock);
1554 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1555 ret = ipv6_prefix_equal(addr, &ifa->addr, prefix_len);
1556 if (ret)
1557 break;
1558 }
1559 read_unlock_bh(&idev->lock);
1560 }
1561 rcu_read_unlock();
1562
1563 return ret;
1564}
1565EXPORT_SYMBOL(ipv6_chk_custom_prefix);
1566
b71d1d42 1567int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev)
52eeeb84
YH		 1568{
1569 struct inet6_dev *idev;
1570 struct inet6_ifaddr *ifa;
1571 int onlink;
1572
1573 onlink = 0;
1574 rcu_read_lock();
1575 idev = __in6_dev_get(dev);
1576 if (idev) {
1577 read_lock_bh(&idev->lock);
502a2ffd 1578 list_for_each_entry(ifa, &idev->addr_list, if_list) {
52eeeb84
YH		 1579 onlink = ipv6_prefix_equal(addr, &ifa->addr,
1580 ifa->prefix_len);
1581 if (onlink)
1582 break;
1583 }
1584 read_unlock_bh(&idev->lock);
1585 }
1586 rcu_read_unlock();
1587 return onlink;
1588}
52eeeb84
YH		 1589EXPORT_SYMBOL(ipv6_chk_prefix);
1590
9acd9f3a 1591struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1cab3da6 1592 struct net_device *dev, int strict)
1da177e4 1593{
b79d1d54 1594 struct inet6_ifaddr *ifp, *result = NULL;
ddbe5032 1595 unsigned int hash = inet6_addr_hash(addr);
1da177e4 1596
5c578aed 1597 rcu_read_lock_bh();
b67bfe0d 1598 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
878628fb 1599 if (!net_eq(dev_net(ifp->idev->dev), net))
1cab3da6 1600 continue;
1da177e4
LT		 1601 if (ipv6_addr_equal(&ifp->addr, addr)) {
1602 if (dev == NULL || ifp->idev->dev == dev ||
1603 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
b79d1d54 1604 result = ifp;
1da177e4
LT		 1605 in6_ifa_hold(ifp);
1606 break;
1607 }
1608 }
1609 }
5c578aed 1610 rcu_read_unlock_bh();
1da177e4 1611
b79d1d54 1612 return result;
1da177e4
LT		 1613}
1614
1da177e4
LT		 1615/* Gets referenced address, destroys ifaddr */
1616
cc411d0b 1617static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
1da177e4 1618{
1da177e4
LT		 1619 if (ifp->flags&IFA_F_PERMANENT) {
1620 spin_lock_bh(&ifp->lock);
835b474b 1621 addrconf_del_dad_work(ifp);
1da177e4 1622 ifp->flags |= IFA_F_TENTATIVE;
cc411d0b
BH		 1623 if (dad_failed)
1624 ifp->flags |= IFA_F_DADFAILED;
1da177e4 1625 spin_unlock_bh(&ifp->lock);
e2577a06
HX		 1626 if (dad_failed)
1627 ipv6_ifa_notify(0, ifp);
1da177e4
LT		 1628 in6_ifa_put(ifp);
1629#ifdef CONFIG_IPV6_PRIVACY
1630 } else if (ifp->flags&IFA_F_TEMPORARY) {
1631 struct inet6_ifaddr *ifpub;
1632 spin_lock_bh(&ifp->lock);
1633 ifpub = ifp->ifpub;
1634 if (ifpub) {
1635 in6_ifa_hold(ifpub);
1636 spin_unlock_bh(&ifp->lock);
1637 ipv6_create_tempaddr(ifpub, ifp);
1638 in6_ifa_put(ifpub);
1639 } else {
1640 spin_unlock_bh(&ifp->lock);
1641 }
1642 ipv6_del_addr(ifp);
1643#endif
835b474b 1644 } else {
1da177e4 1645 ipv6_del_addr(ifp);
835b474b 1646 }
1da177e4
LT		 1647}
1648
f2344a13
HX		 1649static int addrconf_dad_end(struct inet6_ifaddr *ifp)
1650{
1651 int err = -ENOENT;
1652
835b474b 1653 spin_lock_bh(&ifp->state_lock);
f2344a13
HX		 1654 if (ifp->state == INET6_IFADDR_STATE_DAD) {
1655 ifp->state = INET6_IFADDR_STATE_POSTDAD;
1656 err = 0;
1657 }
835b474b 1658 spin_unlock_bh(&ifp->state_lock);
f2344a13
HX		 1659
1660 return err;
1661}
1662
3c21edbd
YH		 1663void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1664{
1b34be74 1665 struct inet6_dev *idev = ifp->idev;
9bdd8d40 1666
853dc2e0
UB		 1667 if (addrconf_dad_end(ifp)) {
1668 in6_ifa_put(ifp);
f2344a13 1669 return;
853dc2e0 1670 }
f2344a13 1671
e87cc472
JP		 1672 net_info_ratelimited("%s: IPv6 duplicate address %pI6c detected!\n",
1673 ifp->idev->dev->name, &ifp->addr);
9bdd8d40 1674
1b34be74
YH		 1675 if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6) {
1676 struct in6_addr addr;
1677
1678 addr.s6_addr32[0] = htonl(0xfe800000);
1679 addr.s6_addr32[1] = 0;
1680
1681 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
1682 ipv6_addr_equal(&ifp->addr, &addr)) {
1683 /* DAD failed for link-local based on MAC address */
1684 idev->cnf.disable_ipv6 = 1;
9bdd8d40 1685
f3213831 1686 pr_info("%s: IPv6 being disabled!\n",
9bdd8d40 1687 ifp->idev->dev->name);
1b34be74
YH		 1688 }
1689 }
1690
835b474b
HFS		 1691 spin_lock_bh(&ifp->state_lock);
1692 /* transition from _POSTDAD to _ERRDAD */
1693 ifp->state = INET6_IFADDR_STATE_ERRDAD;
1694 spin_unlock_bh(&ifp->state_lock);
1695
1696 addrconf_mod_dad_work(ifp, 0);
04355d67 1697 in6_ifa_put(ifp);
3c21edbd 1698}
1da177e4 1699
b64222a9
SD		 1700/* Join to solicited addr multicast group.
1701 * caller must hold RTNL */
b71d1d42 1702void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr)
1da177e4
LT		 1703{
1704 struct in6_addr maddr;
1705
1706 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1707 return;
1708
1709 addrconf_addr_solict_mult(addr, &maddr);
1710 ipv6_dev_mc_inc(dev, &maddr);
1711}
1712
b64222a9 1713/* caller must hold RTNL */
b71d1d42 1714void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr)
1da177e4
LT		 1715{
1716 struct in6_addr maddr;
1717
1718 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1719 return;
1720
1721 addrconf_addr_solict_mult(addr, &maddr);
1722 __ipv6_dev_mc_dec(idev, &maddr);
1723}
1724
b64222a9 1725/* caller must hold RTNL */
20380731 1726static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1da177e4
LT		 1727{
1728 struct in6_addr addr;
835b474b 1729
2bda8a0c
BM		 1730 if (ifp->prefix_len == 127) /* RFC 6164 */
1731 return;
1da177e4
LT		 1732 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1733 if (ipv6_addr_any(&addr))
1734 return;
1735 ipv6_dev_ac_inc(ifp->idev->dev, &addr);
1736}
1737
b64222a9 1738/* caller must hold RTNL */
20380731 1739static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1da177e4
LT		 1740{
1741 struct in6_addr addr;
835b474b 1742
32019e65
YH		 1743 if (ifp->prefix_len == 127) /* RFC 6164 */
1744 return;
1da177e4
LT		 1745 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1746 if (ipv6_addr_any(&addr))
1747 return;
1748 __ipv6_dev_ac_dec(ifp->idev, &addr);
1749}
1750
073a8e0e
YH		 1751static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
1752{
1753 if (dev->addr_len != ETH_ALEN)
1754 return -1;
1755 memcpy(eui, dev->dev_addr, 3);
1756 memcpy(eui + 5, dev->dev_addr + 3, 3);
1757
1758 /*
1759 * The zSeries OSA network cards can be shared among various
1760 * OS instances, but the OSA cards have only one MAC address.
1761 * This leads to duplicate address conflicts in conjunction
1762 * with IPv6 if more than one instance uses the same card.
1763 *
1764 * The driver for these cards can deliver a unique 16-bit
1765 * identifier for each instance sharing the same card. It is
1766 * placed instead of 0xFFFE in the interface identifier. The
1767 * "u" bit of the interface identifier is not inverted in this
1768 * case. Hence the resulting interface identifier has local
1769 * scope according to RFC2373.
1770 */
1771 if (dev->dev_id) {
1772 eui[3] = (dev->dev_id >> 8) & 0xFF;
1773 eui[4] = dev->dev_id & 0xFF;
1774 } else {
1775 eui[3] = 0xFF;
1776 eui[4] = 0xFE;
1777 eui[0] ^= 2;
1778 }
1779 return 0;
1780}
1781
06a4c1c5 1782static int addrconf_ifid_eui64(u8 *eui, struct net_device *dev)
1783{
1784 if (dev->addr_len != IEEE802154_ADDR_LEN)
1785 return -1;
1786 memcpy(eui, dev->dev_addr, 8);
5e98a36e 1787 eui[0] ^= 2;
06a4c1c5 1788 return 0;
1789}
1790
cb6bf355
YH		 1791static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev)
1792{
1793 union fwnet_hwaddr *ha;
1794
1795 if (dev->addr_len != FWNET_ALEN)
1796 return -1;
1797
1798 ha = (union fwnet_hwaddr *)dev->dev_addr;
1799
1800 memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id));
1801 eui[0] ^= 2;
1802 return 0;
1803}
1804
073a8e0e
YH		 1805static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1806{
1807 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1808 if (dev->addr_len != ARCNET_ALEN)
1809 return -1;
1810 memset(eui, 0, 7);
8e5e8f30 1811 eui[7] = *(u8 *)dev->dev_addr;
073a8e0e
YH		 1812 return 0;
1813}
1814
1815static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1816{
1817 if (dev->addr_len != INFINIBAND_ALEN)
1818 return -1;
1819 memcpy(eui, dev->dev_addr + 12, 8);
1820 eui[0] |= 2;
1821 return 0;
1822}
1823
c61393ea 1824static int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
dfd982ba 1825{
9af28511
SH		 1826 if (addr == 0)
1827 return -1;
dfd982ba
YH		 1828 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
1829 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
1830 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
1831 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
1832 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
1833 ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
1834 eui[1] = 0;
1835 eui[2] = 0x5E;
1836 eui[3] = 0xFE;
1837 memcpy(eui + 4, &addr, 4);
1838 return 0;
1839}
dfd982ba
YH		 1840
1841static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
1842{
1843 if (dev->priv_flags & IFF_ISATAP)
1844 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1845 return -1;
1846}
1847
aee80b54 1848static int addrconf_ifid_gre(u8 *eui, struct net_device *dev)
1849{
1850 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1851}
1852
1da177e4
LT		 1853static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1854{
1855 switch (dev->type) {
1856 case ARPHRD_ETHER:
1857 case ARPHRD_FDDI:
073a8e0e 1858 return addrconf_ifid_eui48(eui, dev);
1da177e4 1859 case ARPHRD_ARCNET:
073a8e0e 1860 return addrconf_ifid_arcnet(eui, dev);
1da177e4 1861 case ARPHRD_INFINIBAND:
073a8e0e 1862 return addrconf_ifid_infiniband(eui, dev);
c7dc89c0 1863 case ARPHRD_SIT:
dfd982ba 1864 return addrconf_ifid_sit(eui, dev);
aee80b54 1865 case ARPHRD_IPGRE:
1866 return addrconf_ifid_gre(eui, dev);
06a4c1c5 1867 case ARPHRD_IEEE802154:
1868 return addrconf_ifid_eui64(eui, dev);
cb6bf355
YH		 1869 case ARPHRD_IEEE1394:
1870 return addrconf_ifid_ieee1394(eui, dev);
1da177e4
LT		 1871 }
1872 return -1;
1873}
1874
1875static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1876{
1877 int err = -1;
1878 struct inet6_ifaddr *ifp;
1879
1880 read_lock_bh(&idev->lock);
502a2ffd 1881 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1da177e4
LT		 1882 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1883 memcpy(eui, ifp->addr.s6_addr+8, 8);
1884 err = 0;
1885 break;
1886 }
1887 }
1888 read_unlock_bh(&idev->lock);
1889 return err;
1890}
1891
1892#ifdef CONFIG_IPV6_PRIVACY
1893/* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
eb7e0575 1894static void __ipv6_regen_rndid(struct inet6_dev *idev)
1da177e4 1895{
1da177e4 1896regen:
955189ef 1897 get_random_bytes(idev->rndid, sizeof(idev->rndid));
1da177e4 1898 idev->rndid[0] &= ~0x02;
1da177e4
LT		 1899
1900 /*
1901 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1902 * check if generated address is not inappropriate
1903 *
1904 * - Reserved subnet anycast (RFC 2526)
1905 * 11111101 11....11 1xxxxxxx
c7dc89c0 1906 * - ISATAP (RFC4214) 6.1
1da177e4
LT		 1907 * 00-00-5E-FE-xx-xx-xx-xx
1908 * - value 0
1909 * - XXX: already assigned to an address on the device
1910 */
1ab1457c 1911 if (idev->rndid[0] == 0xfd &&
1da177e4
LT		 1912 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1913 (idev->rndid[7]&0x80))
1914 goto regen;
1915 if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1916 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1917 goto regen;
1918 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1919 goto regen;
1920 }
1da177e4
LT		 1921}
1922
1923static void ipv6_regen_rndid(unsigned long data)
1924{
1925 struct inet6_dev *idev = (struct inet6_dev *) data;
1926 unsigned long expires;
1927
8814c4b5 1928 rcu_read_lock_bh();
1da177e4
LT		 1929 write_lock_bh(&idev->lock);
1930
1931 if (idev->dead)
1932 goto out;
1933
eb7e0575 1934 __ipv6_regen_rndid(idev);
1ab1457c 1935
1da177e4 1936 expires = jiffies +
1ab1457c 1937 idev->cnf.temp_prefered_lft * HZ -
784e2710
BH		 1938 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time -
1939 idev->cnf.max_desync_factor * HZ;
1da177e4 1940 if (time_before(expires, jiffies)) {
f3213831
JP		 1941 pr_warn("%s: too short regeneration interval; timer disabled for %s\n",
1942 __func__, idev->dev->name);
1da177e4
LT		 1943 goto out;
1944 }
1945
1946 if (!mod_timer(&idev->regen_timer, expires))
1947 in6_dev_hold(idev);
1948
1949out:
1950 write_unlock_bh(&idev->lock);
8814c4b5 1951 rcu_read_unlock_bh();
1da177e4
LT		 1952 in6_dev_put(idev);
1953}
1954
eb7e0575 1955static void __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr)
8e5e8f30 1956{
1da177e4 1957 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
eb7e0575 1958 __ipv6_regen_rndid(idev);
1da177e4
LT		 1959}
1960#endif
1961
1962/*
1963 * Add prefix route.
1964 */
1965
1966static void
1967addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
e431b8c0 1968 unsigned long expires, u32 flags)
1da177e4 1969{
86872cb5
TG		 1970 struct fib6_config cfg = {
1971 .fc_table = RT6_TABLE_PREFIX,
1972 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1973 .fc_ifindex = dev->ifindex,
1974 .fc_expires = expires,
1975 .fc_dst_len = plen,
1976 .fc_flags = RTF_UP | flags,
c346dca1 1977 .fc_nlinfo.nl_net = dev_net(dev),
f410a1fb 1978 .fc_protocol = RTPROT_KERNEL,
86872cb5 1979 };
1da177e4 1980
4e3fd7a0 1981 cfg.fc_dst = *pfx;
1da177e4
LT		 1982
1983 /* Prevent useless cloning on PtP SIT.
1984 This thing is done here expecting that the whole
1985 class of non-broadcast devices need not cloning.
1986 */
07a93626 1987#if IS_ENABLED(CONFIG_IPV6_SIT)
86872cb5
TG		 1988 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
1989 cfg.fc_flags |= RTF_NONEXTHOP;
0be669bb 1990#endif
1da177e4 1991
86872cb5 1992 ip6_route_add(&cfg);
1da177e4
LT		 1993}
1994
14ef37b6
AH		 1995
1996static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
1997 int plen,
1998 const struct net_device *dev,
1999 u32 flags, u32 noflags)
2000{
2001 struct fib6_node *fn;
2002 struct rt6_info *rt = NULL;
2003 struct fib6_table *table;
2004
2005 table = fib6_get_table(dev_net(dev), RT6_TABLE_PREFIX);
2006 if (table == NULL)
2007 return NULL;
2008
5744dd9b 2009 read_lock_bh(&table->tb6_lock);
14ef37b6
AH		 2010 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0);
2011 if (!fn)
2012 goto out;
2013 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
d1918542 2014 if (rt->dst.dev->ifindex != dev->ifindex)
14ef37b6
AH		 2015 continue;
2016 if ((rt->rt6i_flags & flags) != flags)
2017 continue;
85da53bf 2018 if ((rt->rt6i_flags & noflags) != 0)
14ef37b6
AH		 2019 continue;
2020 dst_hold(&rt->dst);
2021 break;
2022 }
2023out:
5744dd9b 2024 read_unlock_bh(&table->tb6_lock);
14ef37b6
AH		 2025 return rt;
2026}
2027
2028
1da177e4
LT		 2029/* Create "default" multicast route to the interface */
2030
2031static void addrconf_add_mroute(struct net_device *dev)
2032{
86872cb5
TG		 2033 struct fib6_config cfg = {
2034 .fc_table = RT6_TABLE_LOCAL,
2035 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2036 .fc_ifindex = dev->ifindex,
2037 .fc_dst_len = 8,
2038 .fc_flags = RTF_UP,
c346dca1 2039 .fc_nlinfo.nl_net = dev_net(dev),
86872cb5
TG		 2040 };
2041
2042 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
2043
2044 ip6_route_add(&cfg);
1da177e4
LT		 2045}
2046
07a93626 2047#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4
LT		 2048static void sit_route_add(struct net_device *dev)
2049{
86872cb5
TG		 2050 struct fib6_config cfg = {
2051 .fc_table = RT6_TABLE_MAIN,
2052 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2053 .fc_ifindex = dev->ifindex,
2054 .fc_dst_len = 96,
2055 .fc_flags = RTF_UP | RTF_NONEXTHOP,
c346dca1 2056 .fc_nlinfo.nl_net = dev_net(dev),
86872cb5 2057 };
1da177e4
LT		 2058
2059 /* prefix length - 96 bits "::d.d.d.d" */
86872cb5 2060 ip6_route_add(&cfg);
1da177e4 2061}
0be669bb 2062#endif
1da177e4 2063
1da177e4
LT		 2064static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
2065{
2066 struct inet6_dev *idev;
2067
2068 ASSERT_RTNL();
2069
e21e8467
SH		 2070 idev = ipv6_find_idev(dev);
2071 if (!idev)
64e724f6
BH		 2072 return ERR_PTR(-ENOBUFS);
2073
2074 if (idev->cnf.disable_ipv6)
2075 return ERR_PTR(-EACCES);
1da177e4
LT		 2076
2077 /* Add default multicast route */
4af04aba
LW		 2078 if (!(dev->flags & IFF_LOOPBACK))
2079 addrconf_add_mroute(dev);
1da177e4 2080
1da177e4
LT		 2081 return idev;
2082}
2083
e6bff995 2084void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao)
1da177e4
LT		 2085{
2086 struct prefix_info *pinfo;
2087 __u32 valid_lft;
2088 __u32 prefered_lft;
2089 int addr_type;
1da177e4 2090 struct inet6_dev *in6_dev;
56d417b1 2091 struct net *net = dev_net(dev);
1da177e4
LT		 2092
2093 pinfo = (struct prefix_info *) opt;
1ab1457c 2094
1da177e4
LT		 2095 if (len < sizeof(struct prefix_info)) {
2096 ADBG(("addrconf: prefix option too short\n"));
2097 return;
2098 }
1ab1457c 2099
1da177e4
LT		 2100 /*
2101 * Validation checks ([ADDRCONF], page 19)
2102 */
2103
2104 addr_type = ipv6_addr_type(&pinfo->prefix);
2105
2106 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
2107 return;
2108
2109 valid_lft = ntohl(pinfo->valid);
2110 prefered_lft = ntohl(pinfo->prefered);
2111
2112 if (prefered_lft > valid_lft) {
e87cc472 2113 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n");
1da177e4
LT		 2114 return;
2115 }
2116
2117 in6_dev = in6_dev_get(dev);
2118
2119 if (in6_dev == NULL) {
e87cc472
JP		 2120 net_dbg_ratelimited("addrconf: device %s not configured\n",
2121 dev->name);
1da177e4
LT		 2122 return;
2123 }
2124
2125 /*
2126 * Two things going on here:
2127 * 1) Add routes for on-link prefixes
2128 * 2) Configure prefixes with the auto flag set
2129 */
2130
4bed72e4
YH		 2131 if (pinfo->onlink) {
2132 struct rt6_info *rt;
2133 unsigned long rt_expires;
2134
6f704992
YH		 2135 /* Avoid arithmetic overflow. Really, we could
2136 * save rt_expires in seconds, likely valid_lft,
2137 * but it would require division in fib gc, that it
2138 * not good.
2139 */
4bed72e4
YH		 2140 if (HZ > USER_HZ)
2141 rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
2142 else
2143 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
3dd4bc68 2144
4bed72e4
YH		 2145 if (addrconf_finite_timeout(rt_expires))
2146 rt_expires *= HZ;
1da177e4 2147
14ef37b6
AH		 2148 rt = addrconf_get_prefix_route(&pinfo->prefix,
2149 pinfo->prefix_len,
2150 dev,
2151 RTF_ADDRCONF | RTF_PREFIX_RT,
2152 RTF_GATEWAY | RTF_DEFAULT);
1da177e4 2153
14ef37b6 2154 if (rt) {
6f704992
YH		 2155 /* Autoconf prefix route */
2156 if (valid_lft == 0) {
2157 ip6_del_rt(rt);
2158 rt = NULL;
4bed72e4 2159 } else if (addrconf_finite_timeout(rt_expires)) {
6f704992 2160 /* not infinity */
1716a961 2161 rt6_set_expires(rt, jiffies + rt_expires);
6f704992 2162 } else {
1716a961 2163 rt6_clean_expires(rt);
1da177e4
LT		 2164 }
2165 } else if (valid_lft) {
6f704992 2166 clock_t expires = 0;
4bed72e4
YH		 2167 int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
2168 if (addrconf_finite_timeout(rt_expires)) {
6f704992
YH		 2169 /* not infinity */
2170 flags |= RTF_EXPIRES;
2171 expires = jiffies_to_clock_t(rt_expires);
2172 }
1da177e4 2173 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
6f704992 2174 dev, expires, flags);
1da177e4 2175 }
94e187c0 2176 ip6_rt_put(rt);
1da177e4
LT		 2177 }
2178
2179 /* Try to figure out our local address for this prefix */
2180
2181 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
8e5e8f30 2182 struct inet6_ifaddr *ifp;
1da177e4
LT		 2183 struct in6_addr addr;
2184 int create = 0, update_lft = 0;
617fe29d 2185 bool tokenized = false;
1da177e4
LT		 2186
2187 if (pinfo->prefix_len == 64) {
2188 memcpy(&addr, &pinfo->prefix, 8);
f53adae4
DB		 2189
2190 if (!ipv6_addr_any(&in6_dev->token)) {
2191 read_lock_bh(&in6_dev->lock);
2192 memcpy(addr.s6_addr + 8,
2193 in6_dev->token.s6_addr + 8, 8);
2194 read_unlock_bh(&in6_dev->lock);
617fe29d 2195 tokenized = true;
f53adae4
DB		 2196 } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
2197 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
1da177e4
LT		 2198 in6_dev_put(in6_dev);
2199 return;
2200 }
2201 goto ok;
2202 }
e87cc472
JP		 2203 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n",
2204 pinfo->prefix_len);
1da177e4
LT		 2205 in6_dev_put(in6_dev);
2206 return;
2207
2208ok:
2209
53b7997f 2210 ifp = ipv6_get_ifaddr(net, &addr, dev, 1);
1da177e4
LT		 2211
2212 if (ifp == NULL && valid_lft) {
2213 int max_addresses = in6_dev->cnf.max_addresses;
95c385b4
NH		 2214 u32 addr_flags = 0;
2215
2216#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2217 if (in6_dev->cnf.optimistic_dad &&
e6bff995 2218 !net->ipv6.devconf_all->forwarding && sllao)
95c385b4
NH		 2219 addr_flags = IFA_F_OPTIMISTIC;
2220#endif
1da177e4
LT		 2221
2222 /* Do not allow to create too much of autoconfigured
2223 * addresses; this would be too easy way to crash kernel.
2224 */
2225 if (!max_addresses ||
2226 ipv6_count_addresses(in6_dev) < max_addresses)
2227 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len,
95c385b4
NH		 2228 addr_type&IPV6_ADDR_SCOPE_MASK,
2229 addr_flags);
1da177e4 2230
3f0d2ba0 2231 if (IS_ERR_OR_NULL(ifp)) {
1da177e4
LT		 2232 in6_dev_put(in6_dev);
2233 return;
2234 }
2235
2236 update_lft = create = 1;
2237 ifp->cstamp = jiffies;
617fe29d 2238 ifp->tokenized = tokenized;
cf22f9a2 2239 addrconf_dad_start(ifp);
1da177e4
LT		 2240 }
2241
2242 if (ifp) {
2243 int flags;
2244 unsigned long now;
2245#ifdef CONFIG_IPV6_PRIVACY
2246 struct inet6_ifaddr *ift;
2247#endif
2248 u32 stored_lft;
2249
2250 /* update lifetime (RFC2462 5.5.3 e) */
2251 spin_lock(&ifp->lock);
2252 now = jiffies;
2253 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
2254 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
2255 else
2256 stored_lft = 0;
2257 if (!update_lft && stored_lft) {
2258 if (valid_lft > MIN_VALID_LIFETIME ||
2259 valid_lft > stored_lft)
2260 update_lft = 1;
2261 else if (stored_lft <= MIN_VALID_LIFETIME) {
2262 /* valid_lft <= stored_lft is always true */
a1ed0526
BH		 2263 /*
2264 * RFC 4862 Section 5.5.3e:
2265 * "Note that the preferred lifetime of
2266 * the corresponding address is always
2267 * reset to the Preferred Lifetime in
2268 * the received Prefix Information
2269 * option, regardless of whether the
2270 * valid lifetime is also reset or
2271 * ignored."
2272 *
2273 * So if the preferred lifetime in
2274 * this advertisement is different
2275 * than what we have stored, but the
2276 * valid lifetime is invalid, just
2277 * reset prefered_lft.
2278 *
2279 * We must set the valid lifetime
2280 * to the stored lifetime since we'll
2281 * be updating the timestamp below,
2282 * else we'll set it back to the
25985edc 2283 * minimum.
a1ed0526
BH		 2284 */
2285 if (prefered_lft != ifp->prefered_lft) {
2286 valid_lft = stored_lft;
2287 update_lft = 1;
2288 }
1da177e4
LT		 2289 } else {
2290 valid_lft = MIN_VALID_LIFETIME;
2291 if (valid_lft < prefered_lft)
2292 prefered_lft = valid_lft;
2293 update_lft = 1;
2294 }
2295 }
2296
2297 if (update_lft) {
2298 ifp->valid_lft = valid_lft;
2299 ifp->prefered_lft = prefered_lft;
2300 ifp->tstamp = now;
2301 flags = ifp->flags;
2302 ifp->flags &= ~IFA_F_DEPRECATED;
2303 spin_unlock(&ifp->lock);
2304
2305 if (!(flags&IFA_F_TENTATIVE))
2306 ipv6_ifa_notify(0, ifp);
2307 } else
2308 spin_unlock(&ifp->lock);
2309
2310#ifdef CONFIG_IPV6_PRIVACY
2311 read_lock_bh(&in6_dev->lock);
2312 /* update all temporary addresses in the list */
76f793e3
LC		 2313 list_for_each_entry(ift, &in6_dev->tempaddr_list,
2314 tmp_list) {
2315 int age, max_valid, max_prefered;
2316
c6fbfac2
BB		 2317 if (ifp != ift->ifpub)
2318 continue;
2319
76f793e3
LC		 2320 /*
2321 * RFC 4941 section 3.3:
2322 * If a received option will extend the lifetime
2323 * of a public address, the lifetimes of
2324 * temporary addresses should be extended,
2325 * subject to the overall constraint that no
2326 * temporary addresses should ever remain
2327 * "valid" or "preferred" for a time longer than
2328 * (TEMP_VALID_LIFETIME) or
2329 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR),
2330 * respectively.
2331 */
2332 age = (now - ift->cstamp) / HZ;
2333 max_valid = in6_dev->cnf.temp_valid_lft - age;
2334 if (max_valid < 0)
2335 max_valid = 0;
2336
2337 max_prefered = in6_dev->cnf.temp_prefered_lft -
2338 in6_dev->cnf.max_desync_factor -
2339 age;
2340 if (max_prefered < 0)
2341 max_prefered = 0;
2342
2343 if (valid_lft > max_valid)
2344 valid_lft = max_valid;
2345
2346 if (prefered_lft > max_prefered)
2347 prefered_lft = max_prefered;
2348
1da177e4
LT		 2349 spin_lock(&ift->lock);
2350 flags = ift->flags;
76f793e3
LC		 2351 ift->valid_lft = valid_lft;
2352 ift->prefered_lft = prefered_lft;
2353 ift->tstamp = now;
2354 if (prefered_lft > 0)
2355 ift->flags &= ~IFA_F_DEPRECATED;
2356
1da177e4
LT		 2357 spin_unlock(&ift->lock);
2358 if (!(flags&IFA_F_TENTATIVE))
2359 ipv6_ifa_notify(0, ift);
2360 }
2361
aed65501 2362 if ((create || list_empty(&in6_dev->tempaddr_list)) && in6_dev->cnf.use_tempaddr > 0) {
1da177e4 2363 /*
76f793e3
LC		 2364 * When a new public address is created as
2365 * described in [ADDRCONF], also create a new
2366 * temporary address. Also create a temporary
2367 * address if it's enabled but no temporary
2368 * address currently exists.
1da177e4 2369 */
1ab1457c 2370 read_unlock_bh(&in6_dev->lock);
1da177e4
LT		 2371 ipv6_create_tempaddr(ifp, NULL);
2372 } else {
2373 read_unlock_bh(&in6_dev->lock);
2374 }
2375#endif
2376 in6_ifa_put(ifp);
835b474b 2377 addrconf_verify();
1da177e4
LT		 2378 }
2379 }
2380 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
2381 in6_dev_put(in6_dev);
2382}
2383
2384/*
2385 * Set destination address.
2386 * Special case for SIT interfaces where we create a new "virtual"
2387 * device.
2388 */
af284937 2389int addrconf_set_dstaddr(struct net *net, void __user *arg)
1da177e4
LT		 2390{
2391 struct in6_ifreq ireq;
2392 struct net_device *dev;
2393 int err = -EINVAL;
2394
2395 rtnl_lock();
2396
2397 err = -EFAULT;
2398 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2399 goto err_exit;
2400
af284937 2401 dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
1da177e4
LT		 2402
2403 err = -ENODEV;
2404 if (dev == NULL)
2405 goto err_exit;
2406
07a93626 2407#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4 2408 if (dev->type == ARPHRD_SIT) {
5bc3eb7e 2409 const struct net_device_ops *ops = dev->netdev_ops;
1da177e4 2410 struct ifreq ifr;
1da177e4
LT		 2411 struct ip_tunnel_parm p;
2412
2413 err = -EADDRNOTAVAIL;
2414 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2415 goto err_exit;
2416
2417 memset(&p, 0, sizeof(p));
2418 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2419 p.iph.saddr = 0;
2420 p.iph.version = 4;
2421 p.iph.ihl = 5;
2422 p.iph.protocol = IPPROTO_IPV6;
2423 p.iph.ttl = 64;
d20b3109 2424 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
1da177e4 2425
5bc3eb7e
SH		 2426 if (ops->ndo_do_ioctl) {
2427 mm_segment_t oldfs = get_fs();
2428
2429 set_fs(KERNEL_DS);
2430 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2431 set_fs(oldfs);
2432 } else
2433 err = -EOPNOTSUPP;
1da177e4
LT		 2434
2435 if (err == 0) {
2436 err = -ENOBUFS;
af284937
DL		 2437 dev = __dev_get_by_name(net, p.name);
2438 if (!dev)
1da177e4
LT		 2439 goto err_exit;
2440 err = dev_open(dev);
2441 }
2442 }
0be669bb 2443#endif
1da177e4
LT		 2444
2445err_exit:
2446 rtnl_unlock();
2447 return err;
2448}
2449
2450/*
2451 * Manual configuration of address on an interface
2452 */
b71d1d42 2453static int inet6_addr_add(struct net *net, int ifindex, const struct in6_addr *pfx,
24ef0da7 2454 unsigned int plen, __u8 ifa_flags, __u32 prefered_lft,
af284937 2455 __u32 valid_lft)
1da177e4
LT		 2456{
2457 struct inet6_ifaddr *ifp;
2458 struct inet6_dev *idev;
2459 struct net_device *dev;
2460 int scope;
6f704992
YH		 2461 u32 flags;
2462 clock_t expires;
4bed72e4 2463 unsigned long timeout;
1da177e4
LT		 2464
2465 ASSERT_RTNL();
1ab1457c 2466
24ef0da7
TG		 2467 if (plen > 128)
2468 return -EINVAL;
2469
0778769d
NT		 2470 /* check the lifetime */
2471 if (!valid_lft || prefered_lft > valid_lft)
2472 return -EINVAL;
2473
af284937
DL		 2474 dev = __dev_get_by_index(net, ifindex);
2475 if (!dev)
1da177e4 2476 return -ENODEV;
1ab1457c 2477
64e724f6
BH		 2478 idev = addrconf_add_dev(dev);
2479 if (IS_ERR(idev))
2480 return PTR_ERR(idev);
1da177e4
LT		 2481
2482 scope = ipv6_addr_scope(pfx);
2483
4bed72e4
YH		 2484 timeout = addrconf_timeout_fixup(valid_lft, HZ);
2485 if (addrconf_finite_timeout(timeout)) {
2486 expires = jiffies_to_clock_t(timeout * HZ);
2487 valid_lft = timeout;
6f704992 2488 flags = RTF_EXPIRES;
4bed72e4
YH		 2489 } else {
2490 expires = 0;
2491 flags = 0;
2492 ifa_flags |= IFA_F_PERMANENT;
6f704992 2493 }
0778769d 2494
4bed72e4
YH		 2495 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
2496 if (addrconf_finite_timeout(timeout)) {
2497 if (timeout == 0)
2498 ifa_flags |= IFA_F_DEPRECATED;
2499 prefered_lft = timeout;
2500 }
0778769d
NT		 2501
2502 ifp = ipv6_add_addr(idev, pfx, plen, scope, ifa_flags);
2503
1da177e4 2504 if (!IS_ERR(ifp)) {
06aebfb7 2505 spin_lock_bh(&ifp->lock);
0778769d
NT		 2506 ifp->valid_lft = valid_lft;
2507 ifp->prefered_lft = prefered_lft;
2508 ifp->tstamp = jiffies;
06aebfb7 2509 spin_unlock_bh(&ifp->lock);
0778769d 2510
46d48046 2511 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
6f704992 2512 expires, flags);
95c385b4
NH		 2513 /*
2514 * Note that section 3.1 of RFC 4429 indicates
2515 * that the Optimistic flag should not be set for
2516 * manually configured addresses
2517 */
cf22f9a2 2518 addrconf_dad_start(ifp);
1da177e4 2519 in6_ifa_put(ifp);
835b474b 2520 addrconf_verify_rtnl();
1da177e4
LT		 2521 return 0;
2522 }
2523
2524 return PTR_ERR(ifp);
2525}
2526
b71d1d42 2527static int inet6_addr_del(struct net *net, int ifindex, const struct in6_addr *pfx,
24ef0da7 2528 unsigned int plen)
1da177e4
LT		 2529{
2530 struct inet6_ifaddr *ifp;
2531 struct inet6_dev *idev;
2532 struct net_device *dev;
1ab1457c 2533
24ef0da7
TG		 2534 if (plen > 128)
2535 return -EINVAL;
2536
af284937
DL		 2537 dev = __dev_get_by_index(net, ifindex);
2538 if (!dev)
1da177e4
LT		 2539 return -ENODEV;
2540
2541 if ((idev = __in6_dev_get(dev)) == NULL)
2542 return -ENXIO;
2543
2544 read_lock_bh(&idev->lock);
502a2ffd 2545 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1da177e4
LT		 2546 if (ifp->prefix_len == plen &&
2547 ipv6_addr_equal(pfx, &ifp->addr)) {
2548 in6_ifa_hold(ifp);
2549 read_unlock_bh(&idev->lock);
1ab1457c 2550
1da177e4
LT		 2551 ipv6_del_addr(ifp);
2552
2553 /* If the last address is deleted administratively,
2554 disable IPv6 on this interface.
2555 */
502a2ffd 2556 if (list_empty(&idev->addr_list))
1da177e4
LT		 2557 addrconf_ifdown(idev->dev, 1);
2558 return 0;
2559 }
2560 }
2561 read_unlock_bh(&idev->lock);
2562 return -EADDRNOTAVAIL;
2563}
2564
2565
af284937 2566int addrconf_add_ifaddr(struct net *net, void __user *arg)
1da177e4
LT		 2567{
2568 struct in6_ifreq ireq;
2569 int err;
1ab1457c 2570
af31f412 2571 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1da177e4 2572 return -EPERM;
1ab1457c 2573
1da177e4
LT		 2574 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2575 return -EFAULT;
2576
2577 rtnl_lock();
af284937
DL		 2578 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2579 ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2580 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
1da177e4
LT		 2581 rtnl_unlock();
2582 return err;
2583}
2584
af284937 2585int addrconf_del_ifaddr(struct net *net, void __user *arg)
1da177e4
LT		 2586{
2587 struct in6_ifreq ireq;
2588 int err;
1ab1457c 2589
af31f412 2590 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1da177e4
LT		 2591 return -EPERM;
2592
2593 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2594 return -EFAULT;
2595
2596 rtnl_lock();
af284937
DL		 2597 err = inet6_addr_del(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2598 ireq.ifr6_prefixlen);
1da177e4
LT		 2599 rtnl_unlock();
2600 return err;
2601}
2602
b5f348e5
IJ		 2603static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
2604 int plen, int scope)
2605{
2606 struct inet6_ifaddr *ifp;
2607
2608 ifp = ipv6_add_addr(idev, addr, plen, scope, IFA_F_PERMANENT);
2609 if (!IS_ERR(ifp)) {
2610 spin_lock_bh(&ifp->lock);
2611 ifp->flags &= ~IFA_F_TENTATIVE;
2612 spin_unlock_bh(&ifp->lock);
2613 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2614 in6_ifa_put(ifp);
2615 }
2616}
2617
07a93626 2618#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4
LT		 2619static void sit_add_v4_addrs(struct inet6_dev *idev)
2620{
1da177e4
LT		 2621 struct in6_addr addr;
2622 struct net_device *dev;
c346dca1 2623 struct net *net = dev_net(idev->dev);
1da177e4
LT		 2624 int scope;
2625
2626 ASSERT_RTNL();
2627
2628 memset(&addr, 0, sizeof(struct in6_addr));
2629 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2630
2631 if (idev->dev->flags&IFF_POINTOPOINT) {
2632 addr.s6_addr32[0] = htonl(0xfe800000);
2633 scope = IFA_LINK;
2634 } else {
2635 scope = IPV6_ADDR_COMPATv4;
2636 }
2637
2638 if (addr.s6_addr32[3]) {
b5f348e5 2639 add_addr(idev, &addr, 128, scope);
1da177e4
LT		 2640 return;
2641 }
2642
6fda7350 2643 for_each_netdev(net, dev) {
8e5e8f30 2644 struct in_device *in_dev = __in_dev_get_rtnl(dev);
1da177e4 2645 if (in_dev && (dev->flags & IFF_UP)) {
8e5e8f30 2646 struct in_ifaddr *ifa;
1da177e4
LT		 2647
2648 int flag = scope;
2649
2650 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2651 int plen;
2652
2653 addr.s6_addr32[3] = ifa->ifa_local;
2654
2655 if (ifa->ifa_scope == RT_SCOPE_LINK)
2656 continue;
2657 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2658 if (idev->dev->flags&IFF_POINTOPOINT)
2659 continue;
2660 flag |= IFA_HOST;
2661 }
2662 if (idev->dev->flags&IFF_POINTOPOINT)
2663 plen = 64;
2664 else
2665 plen = 96;
2666
b5f348e5 2667 add_addr(idev, &addr, plen, flag);
1da177e4
LT		 2668 }
2669 }
1ab1457c 2670 }
1da177e4 2671}
0be669bb 2672#endif
1da177e4
LT		 2673
2674static void init_loopback(struct net_device *dev)
2675{
2676 struct inet6_dev *idev;
25fb6ca4
BK		 2677 struct net_device *sp_dev;
2678 struct inet6_ifaddr *sp_ifa;
2679 struct rt6_info *sp_rt;
1da177e4
LT		 2680
2681 /* ::1 */
2682
2683 ASSERT_RTNL();
2684
2685 if ((idev = ipv6_find_idev(dev)) == NULL) {
91df42be 2686 pr_debug("%s: add_dev failed\n", __func__);
1da177e4
LT		 2687 return;
2688 }
2689
b5f348e5 2690 add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
25fb6ca4
BK		 2691
2692 /* Add routes to other interface's IPv6 addresses */
2693 for_each_netdev(dev_net(dev), sp_dev) {
2694 if (!strcmp(sp_dev->name, dev->name))
2695 continue;
2696
2697 idev = __in6_dev_get(sp_dev);
2698 if (!idev)
2699 continue;
2700
2701 read_lock_bh(&idev->lock);
2702 list_for_each_entry(sp_ifa, &idev->addr_list, if_list) {
2703
2704 if (sp_ifa->flags & (IFA_F_DADFAILED | IFA_F_TENTATIVE))
2705 continue;
2706
8eb99ef8
G		 2707 if (sp_ifa->rt) {
2708 /* This dst has been added to garbage list when
2709 * lo device down, release this obsolete dst and
2710 * reallocate a new router for ifa.
2711 */
14ba02f9 2712 if (!atomic_read(&sp_ifa->rt->rt6i_ref)) {
8eb99ef8
G		 2713 ip6_rt_put(sp_ifa->rt);
2714 sp_ifa->rt = NULL;
2715 } else {
2716 continue;
2717 }
2718 }
a881ae1f 2719
25fb6ca4
BK		 2720 sp_rt = addrconf_dst_alloc(idev, &sp_ifa->addr, 0);
2721
2722 /* Failure cases are ignored */
534c8779
G		 2723 if (!IS_ERR(sp_rt)) {
2724 sp_ifa->rt = sp_rt;
25fb6ca4 2725 ip6_ins_rt(sp_rt);
534c8779 2726 }
25fb6ca4
BK		 2727 }
2728 read_unlock_bh(&idev->lock);
2729 }
1da177e4
LT		 2730}
2731
b71d1d42 2732static void addrconf_add_linklocal(struct inet6_dev *idev, const struct in6_addr *addr)
1da177e4 2733{
8e5e8f30 2734 struct inet6_ifaddr *ifp;
95c385b4
NH		 2735 u32 addr_flags = IFA_F_PERMANENT;
2736
2737#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2738 if (idev->cnf.optimistic_dad &&
702beb87 2739 !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
95c385b4
NH		 2740 addr_flags |= IFA_F_OPTIMISTIC;
2741#endif
1da177e4 2742
95c385b4
NH		 2743
2744 ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, addr_flags);
1da177e4 2745 if (!IS_ERR(ifp)) {
46d48046 2746 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
cf22f9a2 2747 addrconf_dad_start(ifp);
1da177e4
LT		 2748 in6_ifa_put(ifp);
2749 }
2750}
2751
2752static void addrconf_dev_config(struct net_device *dev)
2753{
2754 struct in6_addr addr;
8e5e8f30 2755 struct inet6_dev *idev;
1da177e4
LT		 2756
2757 ASSERT_RTNL();
2758
74235a25
HX		 2759 if ((dev->type != ARPHRD_ETHER) &&
2760 (dev->type != ARPHRD_FDDI) &&
74235a25 2761 (dev->type != ARPHRD_ARCNET) &&
06a4c1c5 2762 (dev->type != ARPHRD_INFINIBAND) &&
cb6bf355
YH		 2763 (dev->type != ARPHRD_IEEE802154) &&
2764 (dev->type != ARPHRD_IEEE1394)) {
74235a25
HX		 2765 /* Alas, we support only Ethernet autoconfiguration. */
2766 return;
2767 }
2768
1da177e4 2769 idev = addrconf_add_dev(dev);
64e724f6 2770 if (IS_ERR(idev))
1da177e4
LT		 2771 return;
2772
2773 memset(&addr, 0, sizeof(struct in6_addr));
2774 addr.s6_addr32[0] = htonl(0xFE800000);
2775
2776 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
2777 addrconf_add_linklocal(idev, &addr);
2778}
2779
07a93626 2780#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4
LT		 2781static void addrconf_sit_config(struct net_device *dev)
2782{
2783 struct inet6_dev *idev;
2784
2785 ASSERT_RTNL();
2786
1ab1457c
YH		 2787 /*
2788 * Configure the tunnel with one of our IPv4
2789 * addresses... we should configure all of
1da177e4
LT		 2790 * our v4 addrs in the tunnel
2791 */
2792
2793 if ((idev = ipv6_find_idev(dev)) == NULL) {
91df42be 2794 pr_debug("%s: add_dev failed\n", __func__);
1da177e4
LT		 2795 return;
2796 }
2797
c7dc89c0
FT		 2798 if (dev->priv_flags & IFF_ISATAP) {
2799 struct in6_addr addr;
2800
2801 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
2802 addrconf_prefix_route(&addr, 64, dev, 0, 0);
2803 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2804 addrconf_add_linklocal(idev, &addr);
2805 return;
2806 }
2807
1da177e4
LT		 2808 sit_add_v4_addrs(idev);
2809
62b54dd9 2810 if (dev->flags&IFF_POINTOPOINT)
1da177e4 2811 addrconf_add_mroute(dev);
62b54dd9 2812 else
1da177e4
LT		 2813 sit_route_add(dev);
2814}
0be669bb 2815#endif
1da177e4 2816
07a93626 2817#if IS_ENABLED(CONFIG_NET_IPGRE)
aee80b54 2818static void addrconf_gre_config(struct net_device *dev)
2819{
2820 struct inet6_dev *idev;
2821 struct in6_addr addr;
2822
f3213831 2823 pr_info("%s(%s)\n", __func__, dev->name);
aee80b54 2824
2825 ASSERT_RTNL();
2826
2827 if ((idev = ipv6_find_idev(dev)) == NULL) {
91df42be 2828 pr_debug("%s: add_dev failed\n", __func__);
aee80b54 2829 return;
2830 }
2831
2832 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
2833 addrconf_prefix_route(&addr, 64, dev, 0, 0);
2834
2835 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2836 addrconf_add_linklocal(idev, &addr);
2837}
2838#endif
2839
1da177e4
LT		 2840static inline int
2841ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev)
2842{
2843 struct in6_addr lladdr;
2844
95c385b4 2845 if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) {
1da177e4
LT		 2846 addrconf_add_linklocal(idev, &lladdr);
2847 return 0;
2848 }
2849 return -1;
2850}
2851
2852static void ip6_tnl_add_linklocal(struct inet6_dev *idev)
2853{
2854 struct net_device *link_dev;
c346dca1 2855 struct net *net = dev_net(idev->dev);
1da177e4
LT		 2856
2857 /* first try to inherit the link-local address from the link device */
2858 if (idev->dev->iflink &&
6fda7350 2859 (link_dev = __dev_get_by_index(net, idev->dev->iflink))) {
1da177e4
LT		 2860 if (!ipv6_inherit_linklocal(idev, link_dev))
2861 return;
2862 }
2863 /* then try to inherit it from any device */
6fda7350 2864 for_each_netdev(net, link_dev) {
1da177e4
LT		 2865 if (!ipv6_inherit_linklocal(idev, link_dev))
2866 return;
2867 }
91df42be 2868 pr_debug("init ip6-ip6: add_linklocal failed\n");
1da177e4
LT		 2869}
2870
2871/*
2872 * Autoconfigure tunnel with a link-local address so routing protocols,
2873 * DHCPv6, MLD etc. can be run over the virtual link
2874 */
2875
2876static void addrconf_ip6_tnl_config(struct net_device *dev)
2877{
2878 struct inet6_dev *idev;
2879
2880 ASSERT_RTNL();
2881
e21e8467 2882 idev = addrconf_add_dev(dev);
64e724f6 2883 if (IS_ERR(idev)) {
91df42be 2884 pr_debug("init ip6-ip6: add_dev failed\n");
1da177e4
LT		 2885 return;
2886 }
2887 ip6_tnl_add_linklocal(idev);
1da177e4
LT		 2888}
2889
1ab1457c 2890static int addrconf_notify(struct notifier_block *this, unsigned long event,
8e5e8f30 2891 void *data)
1da177e4
LT		 2892{
2893 struct net_device *dev = (struct net_device *) data;
748e2d93 2894 struct inet6_dev *idev = __in6_dev_get(dev);
fa69abfe 2895 struct net *net = dev_net(dev);
c5e33bdd 2896 int run_pending = 0;
b217d616 2897 int err;
1da177e4 2898
e21e8467 2899 switch (event) {
45ba9dd2 2900 case NETDEV_REGISTER:
74235a25 2901 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
45ba9dd2
YH		 2902 idev = ipv6_add_dev(dev);
2903 if (!idev)
b217d616 2904 return notifier_from_errno(-ENOMEM);
45ba9dd2
YH		 2905 }
2906 break;
bcdd553f 2907
1da177e4 2908 case NETDEV_UP:
3c21edbd 2909 case NETDEV_CHANGE:
c2edacf8
JV		 2910 if (dev->flags & IFF_SLAVE)
2911 break;
2912
3c21edbd 2913 if (event == NETDEV_UP) {
f24e3d65 2914 if (!addrconf_qdisc_ok(dev)) {
3c21edbd 2915 /* device is not ready yet. */
f3213831 2916 pr_info("ADDRCONF(NETDEV_UP): %s: link is not ready\n",
3c21edbd
YH		 2917 dev->name);
2918 break;
2919 }
99081049 2920
d31c7b8f
EP		 2921 if (!idev && dev->mtu >= IPV6_MIN_MTU)
2922 idev = ipv6_add_dev(dev);
2923
e3ec6cfc 2924 if (idev) {
99081049 2925 idev->if_flags |= IF_READY;
e3ec6cfc
BT		 2926 run_pending = 1;
2927 }
3c21edbd 2928 } else {
f24e3d65 2929 if (!addrconf_qdisc_ok(dev)) {
3c21edbd
YH		 2930 /* device is still not ready. */
2931 break;
2932 }
2933
2934 if (idev) {
bcdd553f 2935 if (idev->if_flags & IF_READY)
3c21edbd
YH		 2936 /* device is already configured. */
2937 break;
3c21edbd
YH		 2938 idev->if_flags |= IF_READY;
2939 }
2940
f3213831
JP		 2941 pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n",
2942 dev->name);
3c21edbd 2943
c5e33bdd 2944 run_pending = 1;
3c21edbd
YH		 2945 }
2946
e21e8467 2947 switch (dev->type) {
07a93626 2948#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4
LT		 2949 case ARPHRD_SIT:
2950 addrconf_sit_config(dev);
2951 break;
aee80b54 2952#endif
07a93626 2953#if IS_ENABLED(CONFIG_NET_IPGRE)
aee80b54 2954 case ARPHRD_IPGRE:
2955 addrconf_gre_config(dev);
2956 break;
0be669bb 2957#endif
1da177e4
LT		 2958 case ARPHRD_TUNNEL6:
2959 addrconf_ip6_tnl_config(dev);
2960 break;
2961 case ARPHRD_LOOPBACK:
2962 init_loopback(dev);
2963 break;
2964
2965 default:
2966 addrconf_dev_config(dev);
2967 break;
3ff50b79 2968 }
bcdd553f 2969
1da177e4 2970 if (idev) {
c5e33bdd
YH		 2971 if (run_pending)
2972 addrconf_dad_run(idev);
2973
bcdd553f
SH		 2974 /*
2975 * If the MTU changed during the interface down,
2976 * when the interface up, the changed MTU must be
2977 * reflected in the idev as well as routers.
1da177e4 2978 */
bcdd553f
SH		 2979 if (idev->cnf.mtu6 != dev->mtu &&
2980 dev->mtu >= IPV6_MIN_MTU) {
1da177e4
LT		 2981 rt6_mtu_change(dev, dev->mtu);
2982 idev->cnf.mtu6 = dev->mtu;
2983 }
2984 idev->tstamp = jiffies;
2985 inet6_ifinfo_notify(RTM_NEWLINK, idev);
bcdd553f
SH		 2986
2987 /*
2988 * If the changed mtu during down is lower than
2989 * IPV6_MIN_MTU stop IPv6 on this interface.
1da177e4
LT		 2990 */
2991 if (dev->mtu < IPV6_MIN_MTU)
fa69abfe 2992 addrconf_ifdown(dev, dev != net->loopback_dev);
1da177e4
LT		 2993 }
2994 break;
2995
2996 case NETDEV_CHANGEMTU:
d31c7b8f 2997 if (idev && dev->mtu >= IPV6_MIN_MTU) {
1da177e4
LT		 2998 rt6_mtu_change(dev, dev->mtu);
2999 idev->cnf.mtu6 = dev->mtu;
3000 break;
3001 }
3002
d31c7b8f
EP		 3003 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
3004 idev = ipv6_add_dev(dev);
3005 if (idev)
3006 break;
3007 }
3008
bcdd553f
SH		 3009 /*
3010 * MTU falled under IPV6_MIN_MTU.
3011 * Stop IPv6 on this interface.
3012 */
1da177e4
LT		 3013
3014 case NETDEV_DOWN:
3015 case NETDEV_UNREGISTER:
3016 /*
3017 * Remove all addresses from this interface.
3018 */
3019 addrconf_ifdown(dev, event != NETDEV_DOWN);
3020 break;
3c21edbd 3021
1da177e4 3022 case NETDEV_CHANGENAME:
1da177e4 3023 if (idev) {
5632c515 3024 snmp6_unregister_dev(idev);
408c4768 3025 addrconf_sysctl_unregister(idev);
f52295a9 3026 addrconf_sysctl_register(idev);
b217d616
HX		 3027 err = snmp6_register_dev(idev);
3028 if (err)
3029 return notifier_from_errno(err);
5632c515 3030 }
1da177e4 3031 break;
bcdd553f 3032
93d9b7d7
JP		 3033 case NETDEV_PRE_TYPE_CHANGE:
3034 case NETDEV_POST_TYPE_CHANGE:
3035 addrconf_type_change(dev, event);
75c78500 3036 break;
3ff50b79 3037 }
1da177e4
LT		 3038
3039 return NOTIFY_OK;
3040}
3041
3042/*
3043 * addrconf module should be notified of a device going up
3044 */
3045static struct notifier_block ipv6_dev_notf = {
3046 .notifier_call = addrconf_notify,
1da177e4
LT		 3047};
3048
93d9b7d7 3049static void addrconf_type_change(struct net_device *dev, unsigned long event)
75c78500
MS		 3050{
3051 struct inet6_dev *idev;
3052 ASSERT_RTNL();
3053
3054 idev = __in6_dev_get(dev);
3055
93d9b7d7 3056 if (event == NETDEV_POST_TYPE_CHANGE)
75c78500 3057 ipv6_mc_remap(idev);
93d9b7d7 3058 else if (event == NETDEV_PRE_TYPE_CHANGE)
75c78500
MS		 3059 ipv6_mc_unmap(idev);
3060}
3061
1da177e4
LT		 3062static int addrconf_ifdown(struct net_device *dev, int how)
3063{
c346dca1 3064 struct net *net = dev_net(dev);
502a2ffd 3065 struct inet6_dev *idev;
3066 struct inet6_ifaddr *ifa;
73a8bd74 3067 int state, i;
1da177e4
LT		 3068
3069 ASSERT_RTNL();
3070
73a8bd74
DM		 3071 rt6_ifdown(net, dev);
3072 neigh_ifdown(&nd_tbl, dev);
1da177e4
LT		 3073
3074 idev = __in6_dev_get(dev);
3075 if (idev == NULL)
3076 return -ENODEV;
3077
bcdd553f
SH		 3078 /*
3079 * Step 1: remove reference to ipv6 device from parent device.
3080 * Do not dev_put!
1da177e4 3081 */
439e2385 3082 if (how) {
1da177e4 3083 idev->dead = 1;
8814c4b5
YH		 3084
3085 /* protected by rtnl_lock */
a9b3cd7f 3086 RCU_INIT_POINTER(dev->ip6_ptr, NULL);
1da177e4
LT		 3087
3088 /* Step 1.5: remove snmp6 entry */
3089 snmp6_unregister_dev(idev);
3090
3091 }
3092
73a8bd74
DM		 3093 /* Step 2: clear hash table */
3094 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3095 struct hlist_head *h = &inet6_addr_lst[i];
73a8bd74
DM		 3096
3097 spin_lock_bh(&addrconf_hash_lock);
3098 restart:
b67bfe0d 3099 hlist_for_each_entry_rcu(ifa, h, addr_lst) {
73a8bd74
DM		 3100 if (ifa->idev == idev) {
3101 hlist_del_init_rcu(&ifa->addr_lst);
835b474b 3102 addrconf_del_dad_work(ifa);
73a8bd74
DM		 3103 goto restart;
3104 }
3105 }
3106 spin_unlock_bh(&addrconf_hash_lock);
3107 }
3108
1da177e4
LT		 3109 write_lock_bh(&idev->lock);
3110
973d5956
HFS		 3111 addrconf_del_rs_timer(idev);
3112
bcdd553f 3113 /* Step 2: clear flags for stateless addrconf */
439e2385 3114 if (!how)
3c21edbd 3115 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
1da177e4 3116
1da177e4 3117#ifdef CONFIG_IPV6_PRIVACY
439e2385 3118 if (how && del_timer(&idev->regen_timer))
1da177e4
LT		 3119 in6_dev_put(idev);
3120
bcdd553f 3121 /* Step 3: clear tempaddr list */
372e6c8f 3122 while (!list_empty(&idev->tempaddr_list)) {
3123 ifa = list_first_entry(&idev->tempaddr_list,
3124 struct inet6_ifaddr, tmp_list);
3125 list_del(&ifa->tmp_list);
1da177e4
LT		 3126 write_unlock_bh(&idev->lock);
3127 spin_lock_bh(&ifa->lock);
3128
3129 if (ifa->ifpub) {
3130 in6_ifa_put(ifa->ifpub);
3131 ifa->ifpub = NULL;
3132 }
3133 spin_unlock_bh(&ifa->lock);
3134 in6_ifa_put(ifa);
3135 write_lock_bh(&idev->lock);
3136 }
3137#endif
8f37ada5 3138
502a2ffd 3139 while (!list_empty(&idev->addr_list)) {
3140 ifa = list_first_entry(&idev->addr_list,
3141 struct inet6_ifaddr, if_list);
835b474b 3142 addrconf_del_dad_work(ifa);
84e8b803 3143
73a8bd74 3144 list_del(&ifa->if_list);
84e8b803 3145
73a8bd74 3146 write_unlock_bh(&idev->lock);
84e8b803 3147
73a8bd74
DM		 3148 spin_lock_bh(&ifa->state_lock);
3149 state = ifa->state;
3150 ifa->state = INET6_IFADDR_STATE_DEAD;
3151 spin_unlock_bh(&ifa->state_lock);
9d82ca98 3152
73a8bd74
DM		 3153 if (state != INET6_IFADDR_STATE_DEAD) {
3154 __ipv6_ifa_notify(RTM_DELADDR, ifa);
f88c91dd 3155 inet6addr_notifier_call_chain(NETDEV_DOWN, ifa);
27bdb2ab 3156 }
73a8bd74 3157 in6_ifa_put(ifa);
8f37ada5 3158
73a8bd74
DM		 3159 write_lock_bh(&idev->lock);
3160 }
8f37ada5 3161
1da177e4
LT		 3162 write_unlock_bh(&idev->lock);
3163
3164 /* Step 5: Discard multicast list */
439e2385 3165 if (how)
1da177e4
LT		 3166 ipv6_mc_destroy_dev(idev);
3167 else
3168 ipv6_mc_down(idev);
3169
1da177e4 3170 idev->tstamp = jiffies;
1ab1457c 3171
bcdd553f 3172 /* Last: Shot the device (if unregistered) */
439e2385 3173 if (how) {
408c4768 3174 addrconf_sysctl_unregister(idev);
1da177e4
LT		 3175 neigh_parms_release(&nd_tbl, idev->nd_parms);
3176 neigh_ifdown(&nd_tbl, dev);
3177 in6_dev_put(idev);
3178 }
3179 return 0;
3180}
3181
3182static void addrconf_rs_timer(unsigned long data)
3183{
973d5956
HFS		 3184 struct inet6_dev *idev = (struct inet6_dev *)data;
3185 struct in6_addr lladdr;
1da177e4 3186
973d5956 3187 write_lock(&idev->lock);
5b2a1953 3188 if (idev->dead || !(idev->if_flags & IF_READY))
1da177e4
LT		 3189 goto out;
3190
9ba2add3 3191 if (!ipv6_accept_ra(idev))
5b2a1953 3192 goto out;
3193
3194 /* Announcement received after solicitation was sent */
3195 if (idev->if_flags & IF_RA_RCVD)
1da177e4 3196 goto out;
1da177e4 3197
973d5956
HFS		 3198 if (idev->rs_probes++ < idev->cnf.rtr_solicits) {
3199 if (!__ipv6_get_lladdr(idev, &lladdr, IFA_F_TENTATIVE))
3200 ndisc_send_rs(idev->dev, &lladdr,
3201 &in6addr_linklocal_allrouters);
3202 else
3203 goto out;
1da177e4 3204
973d5956
HFS		 3205 /* The wait after the last probe can be shorter */
3206 addrconf_mod_rs_timer(idev, (idev->rs_probes ==
3207 idev->cnf.rtr_solicits) ?
3208 idev->cnf.rtr_solicit_delay :
3209 idev->cnf.rtr_solicit_interval);
1da177e4 3210 } else {
1da177e4
LT		 3211 /*
3212 * Note: we do not support deprecated "all on-link"
3213 * assumption any longer.
3214 */
91df42be 3215 pr_debug("%s: no IPv6 routers present\n", idev->dev->name);
1da177e4
LT		 3216 }
3217
3218out:
973d5956
HFS		 3219 write_unlock(&idev->lock);
3220 in6_dev_put(idev);
1da177e4
LT		 3221}
3222
3223/*
3224 * Duplicate Address Detection
3225 */
3c21edbd
YH		 3226static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
3227{
3228 unsigned long rand_num;
3229 struct inet6_dev *idev = ifp->idev;
3230
95c385b4
NH		 3231 if (ifp->flags & IFA_F_OPTIMISTIC)
3232 rand_num = 0;
3233 else
3234 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1);
3235
973d5956 3236 ifp->dad_probes = idev->cnf.dad_transmits;
835b474b 3237 addrconf_mod_dad_work(ifp, rand_num);
3c21edbd
YH		 3238}
3239
835b474b 3240static void addrconf_dad_begin(struct inet6_ifaddr *ifp)
1da177e4
LT		 3241{
3242 struct inet6_dev *idev = ifp->idev;
3243 struct net_device *dev = idev->dev;
1da177e4
LT		 3244
3245 addrconf_join_solict(dev, &ifp->addr);
3246
1da177e4 3247 net_srandom(ifp->addr.s6_addr32[3]);
1da177e4
LT		 3248
3249 read_lock_bh(&idev->lock);
622ccdf1 3250 spin_lock(&ifp->lock);
e9d3e084 3251 if (ifp->state == INET6_IFADDR_STATE_DEAD)
1da177e4 3252 goto out;
1da177e4
LT		 3253
3254 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
1b34be74 3255 idev->cnf.accept_dad < 1 ||
55ebaef1
NT		 3256 !(ifp->flags&IFA_F_TENTATIVE) ||
3257 ifp->flags & IFA_F_NODAD) {
cc411d0b 3258 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
21809faf 3259 spin_unlock(&ifp->lock);
1da177e4
LT		 3260 read_unlock_bh(&idev->lock);
3261
3262 addrconf_dad_completed(ifp);
3263 return;
3264 }
3265
6732bade 3266 if (!(idev->if_flags & IF_READY)) {
21809faf 3267 spin_unlock(&ifp->lock);
6732bade 3268 read_unlock_bh(&idev->lock);
3c21edbd 3269 /*
590a9887 3270 * If the device is not ready:
3c21edbd
YH		 3271 * - keep it tentative if it is a permanent address.
3272 * - otherwise, kill it.
3273 */
3274 in6_ifa_hold(ifp);
cc411d0b 3275 addrconf_dad_stop(ifp, 0);
6732bade 3276 return;
3c21edbd 3277 }
95c385b4
NH		 3278
3279 /*
3280 * Optimistic nodes can start receiving
3281 * Frames right away
3282 */
e21e8467 3283 if (ifp->flags & IFA_F_OPTIMISTIC)
95c385b4
NH		 3284 ip6_ins_rt(ifp->rt);
3285
6732bade 3286 addrconf_dad_kick(ifp);
1da177e4 3287out:
622ccdf1 3288 spin_unlock(&ifp->lock);
1da177e4
LT		 3289 read_unlock_bh(&idev->lock);
3290}
3291
835b474b
HFS		 3292static void addrconf_dad_start(struct inet6_ifaddr *ifp)
3293{
3294 bool begin_dad = false;
3295
3296 spin_lock_bh(&ifp->state_lock);
3297 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
3298 ifp->state = INET6_IFADDR_STATE_PREDAD;
3299 begin_dad = true;
3300 }
3301 spin_unlock_bh(&ifp->state_lock);
3302
3303 if (begin_dad)
3304 addrconf_mod_dad_work(ifp, 0);
3305}
3306
3307static void addrconf_dad_work(struct work_struct *w)
1da177e4 3308{
835b474b
HFS		 3309 struct inet6_ifaddr *ifp = container_of(to_delayed_work(w),
3310 struct inet6_ifaddr,
3311 dad_work);
1da177e4 3312 struct inet6_dev *idev = ifp->idev;
1da177e4
LT		 3313 struct in6_addr mcaddr;
3314
835b474b
HFS		 3315 enum {
3316 DAD_PROCESS,
3317 DAD_BEGIN,
3318 DAD_ABORT,
3319 } action = DAD_PROCESS;
3320
3321 rtnl_lock();
3322
3323 spin_lock_bh(&ifp->state_lock);
3324 if (ifp->state == INET6_IFADDR_STATE_PREDAD) {
3325 action = DAD_BEGIN;
3326 ifp->state = INET6_IFADDR_STATE_DAD;
3327 } else if (ifp->state == INET6_IFADDR_STATE_ERRDAD) {
3328 action = DAD_ABORT;
3329 ifp->state = INET6_IFADDR_STATE_POSTDAD;
3330 }
3331 spin_unlock_bh(&ifp->state_lock);
3332
3333 if (action == DAD_BEGIN) {
3334 addrconf_dad_begin(ifp);
3335 goto out;
3336 } else if (action == DAD_ABORT) {
04355d67 3337 in6_ifa_hold(ifp);
835b474b
HFS		 3338 addrconf_dad_stop(ifp, 1);
3339 goto out;
3340 }
3341
973d5956 3342 if (!ifp->dad_probes && addrconf_dad_end(ifp))
f2344a13
HX		 3343 goto out;
3344
835b474b 3345 write_lock_bh(&idev->lock);
122e4519 3346 if (idev->dead || !(idev->if_flags & IF_READY)) {
835b474b 3347 write_unlock_bh(&idev->lock);
1da177e4
LT		 3348 goto out;
3349 }
21809faf 3350
3351 spin_lock(&ifp->lock);
622ccdf1
HX		 3352 if (ifp->state == INET6_IFADDR_STATE_DEAD) {
3353 spin_unlock(&ifp->lock);
835b474b 3354 write_unlock_bh(&idev->lock);
622ccdf1
HX		 3355 goto out;
3356 }
3357
973d5956 3358 if (ifp->dad_probes == 0) {
1da177e4
LT		 3359 /*
3360 * DAD was successful
3361 */
3362
cc411d0b 3363 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
21809faf 3364 spin_unlock(&ifp->lock);
835b474b 3365 write_unlock_bh(&idev->lock);
1da177e4
LT		 3366
3367 addrconf_dad_completed(ifp);
3368
3369 goto out;
3370 }
3371
973d5956 3372 ifp->dad_probes--;
835b474b 3373 addrconf_mod_dad_work(ifp, ifp->idev->nd_parms->retrans_time);
21809faf 3374 spin_unlock(&ifp->lock);
835b474b 3375 write_unlock_bh(&idev->lock);
1da177e4
LT		 3376
3377 /* send a neighbour solicitation for our addr */
1da177e4 3378 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
d7aabf22 3379 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &in6addr_any);
1da177e4
LT		 3380out:
3381 in6_ifa_put(ifp);
835b474b 3382 rtnl_unlock();
1da177e4
LT		 3383}
3384
3385static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
3386{
e21e8467 3387 struct net_device *dev = ifp->idev->dev;
973d5956
HFS		 3388 struct in6_addr lladdr;
3389
835b474b 3390 addrconf_del_dad_work(ifp);
1da177e4
LT		 3391
3392 /*
3393 * Configure the address for reception. Now it is valid.
3394 */
3395
3396 ipv6_ifa_notify(RTM_NEWADDR, ifp);
3397
026359bc
TA		 3398 /* If added prefix is link local and we are prepared to process
3399 router advertisements, start sending router solicitations.
1da177e4
LT		 3400 */
3401
aeaf6e9d 3402 if (ipv6_accept_ra(ifp->idev) &&
1da177e4
LT		 3403 ifp->idev->cnf.rtr_solicits > 0 &&
3404 (dev->flags&IFF_LOOPBACK) == 0 &&
3405 (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) {
1da177e4
LT		 3406 /*
3407 * If a host as already performed a random delay
3408 * [...] as part of DAD [...] there is no need
3409 * to delay again before sending the first RS
3410 */
973d5956
HFS		 3411 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
3412 ndisc_send_rs(dev, &lladdr,
3413 &in6addr_linklocal_allrouters);
3414 else
3415 return;
1da177e4 3416
973d5956
HFS		 3417 write_lock_bh(&ifp->idev->lock);
3418 spin_lock(&ifp->lock);
3419 ifp->idev->rs_probes = 1;
1da177e4 3420 ifp->idev->if_flags |= IF_RS_SENT;
973d5956
HFS		 3421 addrconf_mod_rs_timer(ifp->idev,
3422 ifp->idev->cnf.rtr_solicit_interval);
3423 spin_unlock(&ifp->lock);
3424 write_unlock_bh(&ifp->idev->lock);
1da177e4
LT		 3425 }
3426}
3427
e21e8467
SH		 3428static void addrconf_dad_run(struct inet6_dev *idev)
3429{
c5e33bdd
YH		 3430 struct inet6_ifaddr *ifp;
3431
3432 read_lock_bh(&idev->lock);
502a2ffd 3433 list_for_each_entry(ifp, &idev->addr_list, if_list) {
21809faf 3434 spin_lock(&ifp->lock);
f2344a13
HX		 3435 if (ifp->flags & IFA_F_TENTATIVE &&
3436 ifp->state == INET6_IFADDR_STATE_DAD)
3437 addrconf_dad_kick(ifp);
21809faf 3438 spin_unlock(&ifp->lock);
c5e33bdd
YH		 3439 }
3440 read_unlock_bh(&idev->lock);
3441}
3442
1da177e4
LT		 3443#ifdef CONFIG_PROC_FS
3444struct if6_iter_state {
3c40090a 3445 struct seq_net_private p;
1da177e4 3446 int bucket;
1d578303 3447 int offset;
1da177e4
LT		 3448};
3449
1d578303 3450static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos)
1da177e4
LT		 3451{
3452 struct inet6_ifaddr *ifa = NULL;
3453 struct if6_iter_state *state = seq->private;
1218854a 3454 struct net *net = seq_file_net(seq);
1d578303 3455 int p = 0;
1da177e4 3456
1d578303
MM		 3457 /* initial bucket if pos is 0 */
3458 if (pos == 0) {
3459 state->bucket = 0;
3460 state->offset = 0;
3461 }
3462
3463 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
b67bfe0d 3464 hlist_for_each_entry_rcu_bh(ifa, &inet6_addr_lst[state->bucket],
1d578303 3465 addr_lst) {
9f0d3c27
ED		 3466 if (!net_eq(dev_net(ifa->idev->dev), net))
3467 continue;
1d578303
MM		 3468 /* sync with offset */
3469 if (p < state->offset) {
3470 p++;
3471 continue;
3472 }
3473 state->offset++;
9f0d3c27 3474 return ifa;
1d578303
MM		 3475 }
3476
3477 /* prepare for next bucket */
3478 state->offset = 0;
3479 p = 0;
1da177e4 3480 }
c2e21293 3481 return NULL;
1da177e4
LT		 3482}
3483
c2e21293 3484static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
3485 struct inet6_ifaddr *ifa)
1da177e4
LT		 3486{
3487 struct if6_iter_state *state = seq->private;
1218854a 3488 struct net *net = seq_file_net(seq);
1da177e4 3489
b67bfe0d 3490 hlist_for_each_entry_continue_rcu_bh(ifa, addr_lst) {
9f0d3c27
ED		 3491 if (!net_eq(dev_net(ifa->idev->dev), net))
3492 continue;
1d578303 3493 state->offset++;
9f0d3c27 3494 return ifa;
1d578303 3495 }
3c40090a 3496
c2e21293 3497 while (++state->bucket < IN6_ADDR_HSIZE) {
1d578303 3498 state->offset = 0;
b67bfe0d 3499 hlist_for_each_entry_rcu_bh(ifa,
c2e21293 3500 &inet6_addr_lst[state->bucket], addr_lst) {
9f0d3c27
ED		 3501 if (!net_eq(dev_net(ifa->idev->dev), net))
3502 continue;
1d578303 3503 state->offset++;
9f0d3c27 3504 return ifa;
c2e21293 3505 }
1da177e4 3506 }
3c40090a 3507
c2e21293 3508 return NULL;
1da177e4
LT		 3509}
3510
1da177e4 3511static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
4f70ecca 3512 __acquires(rcu_bh)
1da177e4 3513{
5c578aed 3514 rcu_read_lock_bh();
1d578303 3515 return if6_get_first(seq, *pos);
1da177e4
LT		 3516}
3517
3518static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3519{
3520 struct inet6_ifaddr *ifa;
3521
3522 ifa = if6_get_next(seq, v);
3523 ++*pos;
3524 return ifa;
3525}
3526
3527static void if6_seq_stop(struct seq_file *seq, void *v)
4f70ecca 3528 __releases(rcu_bh)
1da177e4 3529{
5c578aed 3530 rcu_read_unlock_bh();
1da177e4
LT		 3531}
3532
3533static int if6_seq_show(struct seq_file *seq, void *v)
3534{
3535 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
4b7a4274 3536 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
b071195d 3537 &ifp->addr,
1da177e4
LT		 3538 ifp->idev->dev->ifindex,
3539 ifp->prefix_len,
3540 ifp->scope,
3541 ifp->flags,
3542 ifp->idev->dev->name);
3543 return 0;
3544}
3545
56b3d975 3546static const struct seq_operations if6_seq_ops = {
1da177e4
LT		 3547 .start = if6_seq_start,
3548 .next = if6_seq_next,
3549 .show = if6_seq_show,
3550 .stop = if6_seq_stop,
3551};
3552
3553static int if6_seq_open(struct inode *inode, struct file *file)
3554{
3c40090a
DL		 3555 return seq_open_net(inode, file, &if6_seq_ops,
3556 sizeof(struct if6_iter_state));
1da177e4
LT		 3557}
3558
9a32144e 3559static const struct file_operations if6_fops = {
1da177e4
LT		 3560 .owner = THIS_MODULE,
3561 .open = if6_seq_open,
3562 .read = seq_read,
3563 .llseek = seq_lseek,
3c40090a 3564 .release = seq_release_net,
1da177e4
LT		 3565};
3566
2c8c1e72 3567static int __net_init if6_proc_net_init(struct net *net)
1da177e4 3568{
d4beaa66 3569 if (!proc_create("if_inet6", S_IRUGO, net->proc_net, &if6_fops))
1da177e4
LT		 3570 return -ENOMEM;
3571 return 0;
3572}
3573
2c8c1e72 3574static void __net_exit if6_proc_net_exit(struct net *net)
3c40090a 3575{
ece31ffd 3576 remove_proc_entry("if_inet6", net->proc_net);
3c40090a
DL		 3577}
3578
3579static struct pernet_operations if6_proc_net_ops = {
3580 .init = if6_proc_net_init,
3581 .exit = if6_proc_net_exit,
3582};
3583
3584int __init if6_proc_init(void)
3585{
3586 return register_pernet_subsys(&if6_proc_net_ops);
3587}
3588
1da177e4
LT		 3589void if6_proc_exit(void)
3590{
3c40090a 3591 unregister_pernet_subsys(&if6_proc_net_ops);
1da177e4
LT		 3592}
3593#endif /* CONFIG_PROC_FS */
3594
07a93626 3595#if IS_ENABLED(CONFIG_IPV6_MIP6)
3b9f9a1c 3596/* Check if address is a home address configured on any interface. */
b71d1d42 3597int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr)
3b9f9a1c
NT		 3598{
3599 int ret = 0;
c2e21293 3600 struct inet6_ifaddr *ifp = NULL;
ddbe5032 3601 unsigned int hash = inet6_addr_hash(addr);
c2e21293 3602
5c578aed 3603 rcu_read_lock_bh();
b67bfe0d 3604 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
878628fb 3605 if (!net_eq(dev_net(ifp->idev->dev), net))
389f6612 3606 continue;
caad295f 3607 if (ipv6_addr_equal(&ifp->addr, addr) &&
3b9f9a1c
NT		 3608 (ifp->flags & IFA_F_HOMEADDRESS)) {
3609 ret = 1;
3610 break;
3611 }
3612 }
5c578aed 3613 rcu_read_unlock_bh();
3b9f9a1c
NT		 3614 return ret;
3615}
3616#endif
3617
1da177e4
LT		 3618/*
3619 * Periodic address status verification
3620 */
3621
835b474b 3622static void addrconf_verify_rtnl(void)
1da177e4 3623{
b2db7564 3624 unsigned long now, next, next_sec, next_sched;
1da177e4 3625 struct inet6_ifaddr *ifp;
1da177e4
LT		 3626 int i;
3627
835b474b
HFS		 3628 ASSERT_RTNL();
3629
5c578aed 3630 rcu_read_lock_bh();
1da177e4 3631 now = jiffies;
b2db7564 3632 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
1da177e4 3633
835b474b 3634 cancel_delayed_work(&addr_chk_work);
1da177e4 3635
bcdd553f 3636 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
1da177e4 3637restart:
835b474b 3638 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[i], addr_lst) {
1da177e4 3639 unsigned long age;
1da177e4
LT		 3640
3641 if (ifp->flags & IFA_F_PERMANENT)
3642 continue;
3643
3644 spin_lock(&ifp->lock);
b2db7564
YH		 3645 /* We try to batch several events at once. */
3646 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
1da177e4 3647
8f27ebb9
YH		 3648 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
3649 age >= ifp->valid_lft) {
1da177e4
LT		 3650 spin_unlock(&ifp->lock);
3651 in6_ifa_hold(ifp);
1da177e4
LT		 3652 ipv6_del_addr(ifp);
3653 goto restart;
8f27ebb9
YH		 3654 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
3655 spin_unlock(&ifp->lock);
3656 continue;
1da177e4 3657 } else if (age >= ifp->prefered_lft) {
a1ed0526 3658 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
1da177e4
LT		 3659 int deprecate = 0;
3660
3661 if (!(ifp->flags&IFA_F_DEPRECATED)) {
3662 deprecate = 1;
3663 ifp->flags |= IFA_F_DEPRECATED;
3664 }
3665
3666 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))
3667 next = ifp->tstamp + ifp->valid_lft * HZ;
3668
3669 spin_unlock(&ifp->lock);
3670
3671 if (deprecate) {
3672 in6_ifa_hold(ifp);
1da177e4
LT		 3673
3674 ipv6_ifa_notify(0, ifp);
3675 in6_ifa_put(ifp);
3676 goto restart;
3677 }
3678#ifdef CONFIG_IPV6_PRIVACY
3679 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
3680 !(ifp->flags&IFA_F_TENTATIVE)) {
88949cf4 3681 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
3682 ifp->idev->cnf.dad_transmits *
3683 ifp->idev->nd_parms->retrans_time / HZ;
3684
1da177e4
LT		 3685 if (age >= ifp->prefered_lft - regen_advance) {
3686 struct inet6_ifaddr *ifpub = ifp->ifpub;
3687 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3688 next = ifp->tstamp + ifp->prefered_lft * HZ;
3689 if (!ifp->regen_count && ifpub) {
3690 ifp->regen_count++;
3691 in6_ifa_hold(ifp);
3692 in6_ifa_hold(ifpub);
3693 spin_unlock(&ifp->lock);
5c578aed 3694
291d809b
HY		 3695 spin_lock(&ifpub->lock);
3696 ifpub->regen_count = 0;
3697 spin_unlock(&ifpub->lock);
1da177e4
LT		 3698 ipv6_create_tempaddr(ifpub, ifp);
3699 in6_ifa_put(ifpub);
3700 in6_ifa_put(ifp);
3701 goto restart;
3702 }
3703 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
3704 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
3705 spin_unlock(&ifp->lock);
3706#endif
3707 } else {
3708 /* ifp->prefered_lft <= ifp->valid_lft */
3709 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3710 next = ifp->tstamp + ifp->prefered_lft * HZ;
3711 spin_unlock(&ifp->lock);
3712 }
3713 }
1da177e4
LT		 3714 }
3715
b2db7564
YH		 3716 next_sec = round_jiffies_up(next);
3717 next_sched = next;
3718
3719 /* If rounded timeout is accurate enough, accept it. */
3720 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
3721 next_sched = next_sec;
3722
3723 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
3724 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
3725 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
3726
3727 ADBG((KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
3728 now, next, next_sec, next_sched));
835b474b 3729 mod_delayed_work(addrconf_wq, &addr_chk_work, next_sched - now);
5c578aed 3730 rcu_read_unlock_bh();
1da177e4
LT		 3731}
3732
835b474b
HFS		 3733static void addrconf_verify_work(struct work_struct *w)
3734{
3735 rtnl_lock();
3736 addrconf_verify_rtnl();
3737 rtnl_unlock();
3738}
3739
3740static void addrconf_verify(void)
3741{
3742 mod_delayed_work(addrconf_wq, &addr_chk_work, 0);
3743}
3744
461d8837
TG		 3745static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local)
3746{
3747 struct in6_addr *pfx = NULL;
3748
3749 if (addr)
3750 pfx = nla_data(addr);
3751
3752 if (local) {
3753 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
3754 pfx = NULL;
3755 else
3756 pfx = nla_data(local);
3757 }
3758
3759 return pfx;
3760}
3761
ef7c79ed 3762static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
461d8837
TG		 3763 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
3764 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
3765 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
3766};
3767
1da177e4 3768static int
661d2967 3769inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh)
1da177e4 3770{
3b1e0a65 3771 struct net *net = sock_net(skb->sk);
b933f716
TG		 3772 struct ifaddrmsg *ifm;
3773 struct nlattr *tb[IFA_MAX+1];
1da177e4 3774 struct in6_addr *pfx;
b933f716 3775 int err;
1da177e4 3776
b933f716
TG		 3777 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3778 if (err < 0)
3779 return err;
3780
3781 ifm = nlmsg_data(nlh);
3782 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
1da177e4
LT		 3783 if (pfx == NULL)
3784 return -EINVAL;
3785
af284937 3786 return inet6_addr_del(net, ifm->ifa_index, pfx, ifm->ifa_prefixlen);
1da177e4
LT		 3787}
3788
55ebaef1
NT		 3789static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags,
3790 u32 prefered_lft, u32 valid_lft)
081bba5b 3791{
6f704992
YH		 3792 u32 flags;
3793 clock_t expires;
4bed72e4 3794 unsigned long timeout;
46d48046 3795
835b474b
HFS		 3796 ASSERT_RTNL();
3797
081bba5b
NT		 3798 if (!valid_lft || (prefered_lft > valid_lft))
3799 return -EINVAL;
3800
4bed72e4
YH		 3801 timeout = addrconf_timeout_fixup(valid_lft, HZ);
3802 if (addrconf_finite_timeout(timeout)) {
3803 expires = jiffies_to_clock_t(timeout * HZ);
3804 valid_lft = timeout;
6f704992 3805 flags = RTF_EXPIRES;
4bed72e4
YH		 3806 } else {
3807 expires = 0;
3808 flags = 0;
3809 ifa_flags |= IFA_F_PERMANENT;
6f704992 3810 }
081bba5b 3811
4bed72e4
YH		 3812 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
3813 if (addrconf_finite_timeout(timeout)) {
3814 if (timeout == 0)
3815 ifa_flags |= IFA_F_DEPRECATED;
3816 prefered_lft = timeout;
3817 }
081bba5b
NT		 3818
3819 spin_lock_bh(&ifp->lock);
3b9f9a1c 3820 ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags;
081bba5b
NT		 3821 ifp->tstamp = jiffies;
3822 ifp->valid_lft = valid_lft;
3823 ifp->prefered_lft = prefered_lft;
3824
3825 spin_unlock_bh(&ifp->lock);
3826 if (!(ifp->flags&IFA_F_TENTATIVE))
3827 ipv6_ifa_notify(0, ifp);
081bba5b 3828
46d48046 3829 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
6f704992 3830 expires, flags);
835b474b 3831 addrconf_verify_rtnl();
081bba5b
NT		 3832
3833 return 0;
3834}
3835
1da177e4 3836static int
661d2967 3837inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh)
1da177e4 3838{
3b1e0a65 3839 struct net *net = sock_net(skb->sk);
461d8837
TG		 3840 struct ifaddrmsg *ifm;
3841 struct nlattr *tb[IFA_MAX+1];
1da177e4 3842 struct in6_addr *pfx;
7198f8ce
TG		 3843 struct inet6_ifaddr *ifa;
3844 struct net_device *dev;
55ebaef1
NT		 3845 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
3846 u8 ifa_flags;
461d8837 3847 int err;
1da177e4 3848
461d8837
TG		 3849 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3850 if (err < 0)
3851 return err;
3852
3853 ifm = nlmsg_data(nlh);
3854 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
1da177e4
LT		 3855 if (pfx == NULL)
3856 return -EINVAL;
3857
461d8837 3858 if (tb[IFA_CACHEINFO]) {
0778769d 3859 struct ifa_cacheinfo *ci;
461d8837
TG		 3860
3861 ci = nla_data(tb[IFA_CACHEINFO]);
0778769d 3862 valid_lft = ci->ifa_valid;
461d8837
TG		 3863 preferred_lft = ci->ifa_prefered;
3864 } else {
3865 preferred_lft = INFINITY_LIFE_TIME;
3866 valid_lft = INFINITY_LIFE_TIME;
0778769d
NT		 3867 }
3868
af284937 3869 dev = __dev_get_by_index(net, ifm->ifa_index);
7198f8ce
TG		 3870 if (dev == NULL)
3871 return -ENODEV;
3872
55ebaef1 3873 /* We ignore other flags so far. */
3b9f9a1c 3874 ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS);
55ebaef1 3875
1cab3da6 3876 ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
7198f8ce
TG		 3877 if (ifa == NULL) {
3878 /*
3879 * It would be best to check for !NLM_F_CREATE here but
3880 * userspace alreay relies on not having to provide this.
3881 */
af284937
DL		 3882 return inet6_addr_add(net, ifm->ifa_index, pfx,
3883 ifm->ifa_prefixlen, ifa_flags,
3884 preferred_lft, valid_lft);
081bba5b
NT		 3885 }
3886
7198f8ce
TG		 3887 if (nlh->nlmsg_flags & NLM_F_EXCL ||
3888 !(nlh->nlmsg_flags & NLM_F_REPLACE))
3889 err = -EEXIST;
3890 else
55ebaef1 3891 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
7198f8ce
TG		 3892
3893 in6_ifa_put(ifa);
3894
3895 return err;
1da177e4
LT		 3896}
3897
101bb229
TG		 3898static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags,
3899 u8 scope, int ifindex)
3900{
3901 struct ifaddrmsg *ifm;
3902
3903 ifm = nlmsg_data(nlh);
3904 ifm->ifa_family = AF_INET6;
3905 ifm->ifa_prefixlen = prefixlen;
3906 ifm->ifa_flags = flags;
3907 ifm->ifa_scope = scope;
3908 ifm->ifa_index = ifindex;
3909}
3910
85486af0
TG		 3911static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
3912 unsigned long tstamp, u32 preferred, u32 valid)
3913{
3914 struct ifa_cacheinfo ci;
3915
18a31e1e
TG		 3916 ci.cstamp = cstamp_delta(cstamp);
3917 ci.tstamp = cstamp_delta(tstamp);
85486af0
TG		 3918 ci.ifa_prefered = preferred;
3919 ci.ifa_valid = valid;
3920
3921 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
3922}
3923
101bb229
TG		 3924static inline int rt_scope(int ifa_scope)
3925{
3926 if (ifa_scope & IFA_HOST)
3927 return RT_SCOPE_HOST;
3928 else if (ifa_scope & IFA_LINK)
3929 return RT_SCOPE_LINK;
3930 else if (ifa_scope & IFA_SITE)
3931 return RT_SCOPE_SITE;
3932 else
3933 return RT_SCOPE_UNIVERSE;
3934}
3935
0ab6803b
TG		 3936static inline int inet6_ifaddr_msgsize(void)
3937{
339bf98f
TG		 3938 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
3939 + nla_total_size(16) /* IFA_ADDRESS */
3940 + nla_total_size(sizeof(struct ifa_cacheinfo));
0ab6803b 3941}
c5396a31 3942
1da177e4 3943static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
15e47304 3944 u32 portid, u32 seq, int event, unsigned int flags)
1da177e4 3945{
1da177e4 3946 struct nlmsghdr *nlh;
85486af0 3947 u32 preferred, valid;
1da177e4 3948
15e47304 3949 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
0ab6803b 3950 if (nlh == NULL)
26932566 3951 return -EMSGSIZE;
0ab6803b 3952
101bb229
TG		 3953 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
3954 ifa->idev->dev->ifindex);
3955
1da177e4 3956 if (!(ifa->flags&IFA_F_PERMANENT)) {
85486af0
TG		 3957 preferred = ifa->prefered_lft;
3958 valid = ifa->valid_lft;
3959 if (preferred != INFINITY_LIFE_TIME) {
1da177e4 3960 long tval = (jiffies - ifa->tstamp)/HZ;
a1faa698
JR		 3961 if (preferred > tval)
3962 preferred -= tval;
3963 else
3964 preferred = 0;
f56619fc
BH		 3965 if (valid != INFINITY_LIFE_TIME) {
3966 if (valid > tval)
3967 valid -= tval;
3968 else
3969 valid = 0;
3970 }
1da177e4
LT		 3971 }
3972 } else {
85486af0
TG		 3973 preferred = INFINITY_LIFE_TIME;
3974 valid = INFINITY_LIFE_TIME;
3975 }
3976
0ab6803b 3977 if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0 ||
26932566
PM		 3978 put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) {
3979 nlmsg_cancel(skb, nlh);
3980 return -EMSGSIZE;
3981 }
1da177e4 3982
0ab6803b 3983 return nlmsg_end(skb, nlh);
1da177e4
LT		 3984}
3985
3986static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
15e47304 3987 u32 portid, u32 seq, int event, u16 flags)
1da177e4 3988{
1da177e4 3989 struct nlmsghdr *nlh;
101bb229
TG		 3990 u8 scope = RT_SCOPE_UNIVERSE;
3991 int ifindex = ifmca->idev->dev->ifindex;
3992
3993 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
3994 scope = RT_SCOPE_SITE;
1da177e4 3995
15e47304 3996 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
0ab6803b 3997 if (nlh == NULL)
26932566 3998 return -EMSGSIZE;
85486af0 3999
0ab6803b
TG		 4000 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
4001 if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 ||
4002 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
26932566
PM		 4003 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
4004 nlmsg_cancel(skb, nlh);
4005 return -EMSGSIZE;
4006 }
85486af0 4007
0ab6803b 4008 return nlmsg_end(skb, nlh);
1da177e4
LT		 4009}
4010
4011static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
15e47304 4012 u32 portid, u32 seq, int event, unsigned int flags)
1da177e4 4013{
1da177e4 4014 struct nlmsghdr *nlh;
101bb229
TG		 4015 u8 scope = RT_SCOPE_UNIVERSE;
4016 int ifindex = ifaca->aca_idev->dev->ifindex;
4017
4018 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
4019 scope = RT_SCOPE_SITE;
1da177e4 4020
15e47304 4021 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
0ab6803b 4022 if (nlh == NULL)
26932566 4023 return -EMSGSIZE;
85486af0 4024
0ab6803b
TG		 4025 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
4026 if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 ||
4027 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
26932566
PM		 4028 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
4029 nlmsg_cancel(skb, nlh);
4030 return -EMSGSIZE;
4031 }
1da177e4 4032
0ab6803b 4033 return nlmsg_end(skb, nlh);
1da177e4
LT		 4034}
4035
e21e8467 4036enum addr_type_t {
1da177e4
LT		 4037 UNICAST_ADDR,
4038 MULTICAST_ADDR,
4039 ANYCAST_ADDR,
4040};
4041
234b27c3
ED		 4042/* called with rcu_read_lock() */
4043static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
4044 struct netlink_callback *cb, enum addr_type_t type,
4045 int s_ip_idx, int *p_ip_idx)
4046{
234b27c3
ED		 4047 struct ifmcaddr6 *ifmca;
4048 struct ifacaddr6 *ifaca;
4049 int err = 1;
4050 int ip_idx = *p_ip_idx;
4051
4052 read_lock_bh(&idev->lock);
4053 switch (type) {
502a2ffd 4054 case UNICAST_ADDR: {
4055 struct inet6_ifaddr *ifa;
4056
234b27c3 4057 /* unicast address incl. temp addr */
502a2ffd 4058 list_for_each_entry(ifa, &idev->addr_list, if_list) {
4059 if (++ip_idx < s_ip_idx)
234b27c3
ED		 4060 continue;
4061 err = inet6_fill_ifaddr(skb, ifa,
15e47304 4062 NETLINK_CB(cb->skb).portid,
234b27c3
ED		 4063 cb->nlh->nlmsg_seq,
4064 RTM_NEWADDR,
4065 NLM_F_MULTI);
4066 if (err <= 0)
4067 break;
63998ac2 4068 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
234b27c3
ED		 4069 }
4070 break;
502a2ffd 4071 }
234b27c3
ED		 4072 case MULTICAST_ADDR:
4073 /* multicast address */
4074 for (ifmca = idev->mc_list; ifmca;
4075 ifmca = ifmca->next, ip_idx++) {
4076 if (ip_idx < s_ip_idx)
4077 continue;
4078 err = inet6_fill_ifmcaddr(skb, ifmca,
15e47304 4079 NETLINK_CB(cb->skb).portid,
234b27c3
ED		 4080 cb->nlh->nlmsg_seq,
4081 RTM_GETMULTICAST,
4082 NLM_F_MULTI);
4083 if (err <= 0)
4084 break;
4085 }
4086 break;
4087 case ANYCAST_ADDR:
4088 /* anycast address */
4089 for (ifaca = idev->ac_list; ifaca;
4090 ifaca = ifaca->aca_next, ip_idx++) {
4091 if (ip_idx < s_ip_idx)
4092 continue;
4093 err = inet6_fill_ifacaddr(skb, ifaca,
15e47304 4094 NETLINK_CB(cb->skb).portid,
234b27c3
ED		 4095 cb->nlh->nlmsg_seq,
4096 RTM_GETANYCAST,
4097 NLM_F_MULTI);
4098 if (err <= 0)
4099 break;
4100 }
4101 break;
4102 default:
4103 break;
4104 }
4105 read_unlock_bh(&idev->lock);
4106 *p_ip_idx = ip_idx;
4107 return err;
4108}
4109
1da177e4
LT		 4110static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
4111 enum addr_type_t type)
4112{
234b27c3
ED		 4113 struct net *net = sock_net(skb->sk);
4114 int h, s_h;
1da177e4
LT		 4115 int idx, ip_idx;
4116 int s_idx, s_ip_idx;
1da177e4 4117 struct net_device *dev;
234b27c3
ED		 4118 struct inet6_dev *idev;
4119 struct hlist_head *head;
1ab1457c 4120
234b27c3
ED		 4121 s_h = cb->args[0];
4122 s_idx = idx = cb->args[1];
4123 s_ip_idx = ip_idx = cb->args[2];
5d5619b4 4124
234b27c3 4125 rcu_read_lock();
63998ac2 4126 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ net->dev_base_seq;
234b27c3
ED		 4127 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4128 idx = 0;
4129 head = &net->dev_index_head[h];
b67bfe0d 4130 hlist_for_each_entry_rcu(dev, head, index_hlist) {
234b27c3
ED		 4131 if (idx < s_idx)
4132 goto cont;
4b97efdf 4133 if (h > s_h || idx > s_idx)
234b27c3
ED		 4134 s_ip_idx = 0;
4135 ip_idx = 0;
e21e8467
SH		 4136 idev = __in6_dev_get(dev);
4137 if (!idev)
234b27c3
ED		 4138 goto cont;
4139
4140 if (in6_dump_addrs(idev, skb, cb, type,
4141 s_ip_idx, &ip_idx) <= 0)
4142 goto done;
7562f876 4143cont:
234b27c3
ED		 4144 idx++;
4145 }
1da177e4 4146 }
234b27c3
ED		 4147done:
4148 rcu_read_unlock();
4149 cb->args[0] = h;
4150 cb->args[1] = idx;
4151 cb->args[2] = ip_idx;
4152
1da177e4
LT		 4153 return skb->len;
4154}
4155
4156static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
4157{
4158 enum addr_type_t type = UNICAST_ADDR;
b854272b 4159
1da177e4
LT		 4160 return inet6_dump_addr(skb, cb, type);
4161}
4162
4163static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
4164{
4165 enum addr_type_t type = MULTICAST_ADDR;
b854272b 4166
1da177e4
LT		 4167 return inet6_dump_addr(skb, cb, type);
4168}
4169
4170
4171static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
4172{
4173 enum addr_type_t type = ANYCAST_ADDR;
b854272b 4174
1da177e4
LT		 4175 return inet6_dump_addr(skb, cb, type);
4176}
4177
661d2967 4178static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh)
6c223828 4179{
3b1e0a65 4180 struct net *net = sock_net(in_skb->sk);
1b29fc2c
TG		 4181 struct ifaddrmsg *ifm;
4182 struct nlattr *tb[IFA_MAX+1];
6c223828
NT		 4183 struct in6_addr *addr = NULL;
4184 struct net_device *dev = NULL;
4185 struct inet6_ifaddr *ifa;
4186 struct sk_buff *skb;
6c223828
NT		 4187 int err;
4188
1b29fc2c
TG		 4189 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
4190 if (err < 0)
4191 goto errout;
4192
4193 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
4194 if (addr == NULL) {
4195 err = -EINVAL;
4196 goto errout;
6c223828 4197 }
6c223828 4198
1b29fc2c 4199 ifm = nlmsg_data(nlh);
6c223828 4200 if (ifm->ifa_index)
6fda7350 4201 dev = __dev_get_by_index(net, ifm->ifa_index);
6c223828 4202
e21e8467
SH		 4203 ifa = ipv6_get_ifaddr(net, addr, dev, 1);
4204 if (!ifa) {
1b29fc2c
TG		 4205 err = -EADDRNOTAVAIL;
4206 goto errout;
4207 }
6c223828 4208
e21e8467
SH		 4209 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
4210 if (!skb) {
6c223828 4211 err = -ENOBUFS;
1b29fc2c 4212 goto errout_ifa;
6c223828
NT		 4213 }
4214
15e47304 4215 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).portid,
6c223828 4216 nlh->nlmsg_seq, RTM_NEWADDR, 0);
26932566
PM		 4217 if (err < 0) {
4218 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4219 WARN_ON(err == -EMSGSIZE);
4220 kfree_skb(skb);
4221 goto errout_ifa;
4222 }
15e47304 4223 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
1b29fc2c 4224errout_ifa:
6c223828 4225 in6_ifa_put(ifa);
1b29fc2c 4226errout:
6c223828 4227 return err;
6c223828
NT		 4228}
4229
1da177e4
LT		 4230static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
4231{
4232 struct sk_buff *skb;
c346dca1 4233 struct net *net = dev_net(ifa->idev->dev);
5d620266 4234 int err = -ENOBUFS;
1da177e4 4235
0ab6803b 4236 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
5d620266
TG		 4237 if (skb == NULL)
4238 goto errout;
4239
4240 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
26932566
PM		 4241 if (err < 0) {
4242 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4243 WARN_ON(err == -EMSGSIZE);
4244 kfree_skb(skb);
4245 goto errout;
4246 }
1ce85fe4
PNA		 4247 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
4248 return;
5d620266
TG		 4249errout:
4250 if (err < 0)
6fda7350 4251 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
1da177e4
LT		 4252}
4253
b6f99a21 4254static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
1da177e4
LT		 4255 __s32 *array, int bytes)
4256{
04561c1f
TG		 4257 BUG_ON(bytes < (DEVCONF_MAX * 4));
4258
1da177e4
LT		 4259 memset(array, 0, bytes);
4260 array[DEVCONF_FORWARDING] = cnf->forwarding;
4261 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
4262 array[DEVCONF_MTU6] = cnf->mtu6;
4263 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
4264 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
4265 array[DEVCONF_AUTOCONF] = cnf->autoconf;
4266 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
4267 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
93908d19
TG		 4268 array[DEVCONF_RTR_SOLICIT_INTERVAL] =
4269 jiffies_to_msecs(cnf->rtr_solicit_interval);
4270 array[DEVCONF_RTR_SOLICIT_DELAY] =
4271 jiffies_to_msecs(cnf->rtr_solicit_delay);
1da177e4
LT		 4272 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
4273#ifdef CONFIG_IPV6_PRIVACY
4274 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
4275 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
4276 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
4277 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
4278 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
4279#endif
4280 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
65f5c7c1 4281 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
c4fd30eb 4282 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
930d6ff2
YH		 4283#ifdef CONFIG_IPV6_ROUTER_PREF
4284 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
93908d19
TG		 4285 array[DEVCONF_RTR_PROBE_INTERVAL] =
4286 jiffies_to_msecs(cnf->rtr_probe_interval);
fa03ef38 4287#ifdef CONFIG_IPV6_ROUTE_INFO
09c884d4
YH		 4288 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
4289#endif
930d6ff2 4290#endif
fbea49e1 4291 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
0bcbc926 4292 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
95c385b4
NH		 4293#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4294 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
4295#endif
7bc570c8
YH		 4296#ifdef CONFIG_IPV6_MROUTE
4297 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
4298#endif
778d80be 4299 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
1b34be74 4300 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
c3faca05 4301 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
5cb04436 4302 array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify;
1da177e4
LT		 4303}
4304
b382b191
TG		 4305static inline size_t inet6_ifla6_size(void)
4306{
4307 return nla_total_size(4) /* IFLA_INET6_FLAGS */
4308 + nla_total_size(sizeof(struct ifla_cacheinfo))
4309 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
4310 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
f53adae4
DB		 4311 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
4312 + nla_total_size(sizeof(struct in6_addr)); /* IFLA_INET6_TOKEN */
b382b191
TG		 4313}
4314
339bf98f
TG		 4315static inline size_t inet6_if_nlmsg_size(void)
4316{
4317 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
4318 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
4319 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
4320 + nla_total_size(4) /* IFLA_MTU */
4321 + nla_total_size(4) /* IFLA_LINK */
b382b191 4322 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */
339bf98f 4323}
c5396a31 4324
be281e55 4325static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib,
7d720c3e 4326 int items, int bytes)
7f7d9a6b
HX		 4327{
4328 int i;
4329 int pad = bytes - sizeof(u64) * items;
4330 BUG_ON(pad < 0);
4331
4332 /* Use put_unaligned() because stats may not be aligned for u64. */
4333 put_unaligned(items, &stats[0]);
4334 for (i = 1; i < items; i++)
be281e55 4335 put_unaligned(atomic_long_read(&mib[i]), &stats[i]);
7f7d9a6b
HX		 4336
4337 memset(&stats[items], 0, pad);
4338}
4339
4ce3c183
ED		 4340static inline void __snmp6_fill_stats64(u64 *stats, void __percpu **mib,
4341 int items, int bytes, size_t syncpoff)
4342{
4343 int i;
4344 int pad = bytes - sizeof(u64) * items;
4345 BUG_ON(pad < 0);
4346
4347 /* Use put_unaligned() because stats may not be aligned for u64. */
4348 put_unaligned(items, &stats[0]);
4349 for (i = 1; i < items; i++)
4350 put_unaligned(snmp_fold_field64(mib, i, syncpoff), &stats[i]);
4351
4352 memset(&stats[items], 0, pad);
4353}
4354
7f7d9a6b
HX		 4355static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
4356 int bytes)
4357{
e21e8467 4358 switch (attrtype) {
7f7d9a6b 4359 case IFLA_INET6_STATS:
4ce3c183
ED		 4360 __snmp6_fill_stats64(stats, (void __percpu **)idev->stats.ipv6,
4361 IPSTATS_MIB_MAX, bytes, offsetof(struct ipstats_mib, syncp));
7f7d9a6b
HX		 4362 break;
4363 case IFLA_INET6_ICMP6STATS:
be281e55 4364 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, ICMP6_MIB_MAX, bytes);
7f7d9a6b
HX		 4365 break;
4366 }
4367}
4368
b382b191
TG		 4369static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev)
4370{
4371 struct nlattr *nla;
4372 struct ifla_cacheinfo ci;
4373
c78679e8
DM		 4374 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags))
4375 goto nla_put_failure;
b382b191 4376 ci.max_reasm_len = IPV6_MAXPLEN;
24912420
DM		 4377 ci.tstamp = cstamp_delta(idev->tstamp);
4378 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time);
4379 ci.retrans_time = jiffies_to_msecs(idev->nd_parms->retrans_time);
c78679e8
DM		 4380 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci))
4381 goto nla_put_failure;
b382b191
TG		 4382 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
4383 if (nla == NULL)
4384 goto nla_put_failure;
4385 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
4386
4387 /* XXX - MC not implemented */
4388
4389 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
4390 if (nla == NULL)
4391 goto nla_put_failure;
4392 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
4393
4394 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
4395 if (nla == NULL)
4396 goto nla_put_failure;
4397 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
4398
f53adae4
DB		 4399 nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr));
4400 if (nla == NULL)
4401 goto nla_put_failure;
4402 read_lock_bh(&idev->lock);
4403 memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla));
4404 read_unlock_bh(&idev->lock);
4405
b382b191
TG		 4406 return 0;
4407
4408nla_put_failure:
4409 return -EMSGSIZE;
4410}
4411
4412static size_t inet6_get_link_af_size(const struct net_device *dev)
4413{
4414 if (!__in6_dev_get(dev))
4415 return 0;
4416
4417 return inet6_ifla6_size();
4418}
4419
4420static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev)
4421{
4422 struct inet6_dev *idev = __in6_dev_get(dev);
4423
4424 if (!idev)
4425 return -ENODATA;
4426
4427 if (inet6_fill_ifla6_attrs(skb, idev) < 0)
4428 return -EMSGSIZE;
4429
4430 return 0;
4431}
4432
f53adae4
DB		 4433static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token)
4434{
f53adae4
DB		 4435 struct inet6_ifaddr *ifp;
4436 struct net_device *dev = idev->dev;
fc403832 4437 bool update_rs = false;
dc848292 4438 struct in6_addr ll_addr;
f53adae4 4439
835b474b
HFS		 4440 ASSERT_RTNL();
4441
f53adae4
DB		 4442 if (token == NULL)
4443 return -EINVAL;
4444 if (ipv6_addr_any(token))
4445 return -EINVAL;
4446 if (dev->flags & (IFF_LOOPBACK | IFF_NOARP))
4447 return -EINVAL;
f53adae4
DB		 4448 if (!ipv6_accept_ra(idev))
4449 return -EINVAL;
4450 if (idev->cnf.rtr_solicits <= 0)
4451 return -EINVAL;
4452
4453 write_lock_bh(&idev->lock);
4454
4455 BUILD_BUG_ON(sizeof(token->s6_addr) != 16);
4456 memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8);
4457
4458 write_unlock_bh(&idev->lock);
4459
dc848292
HFS		 4460 if (!idev->dead && (idev->if_flags & IF_READY) &&
4461 !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE |
4462 IFA_F_OPTIMISTIC)) {
fc403832
DB		 4463
4464 /* If we're not ready, then normal ifup will take care
4465 * of this. Otherwise, we need to request our rs here.
4466 */
4467 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters);
4468 update_rs = true;
4469 }
f53adae4
DB		 4470
4471 write_lock_bh(&idev->lock);
fc403832
DB		 4472
4473 if (update_rs)
4474 idev->if_flags |= IF_RS_SENT;
f53adae4
DB		 4475
4476 /* Well, that's kinda nasty ... */
4477 list_for_each_entry(ifp, &idev->addr_list, if_list) {
4478 spin_lock(&ifp->lock);
617fe29d 4479 if (ifp->tokenized) {
f53adae4
DB		 4480 ifp->valid_lft = 0;
4481 ifp->prefered_lft = 0;
4482 }
4483 spin_unlock(&ifp->lock);
4484 }
4485
4486 write_unlock_bh(&idev->lock);
835b474b 4487 addrconf_verify_rtnl();
f53adae4
DB		 4488 return 0;
4489}
4490
4491static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla)
4492{
4493 int err = -EINVAL;
4494 struct inet6_dev *idev = __in6_dev_get(dev);
4495 struct nlattr *tb[IFLA_INET6_MAX + 1];
4496
4497 if (!idev)
4498 return -EAFNOSUPPORT;
4499
4500 if (nla_parse_nested(tb, IFLA_INET6_MAX, nla, NULL) < 0)
4501 BUG();
4502
4503 if (tb[IFLA_INET6_TOKEN])
4504 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN]));
4505
4506 return err;
4507}
4508
1ab1457c 4509static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
15e47304 4510 u32 portid, u32 seq, int event, unsigned int flags)
1da177e4 4511{
04561c1f 4512 struct net_device *dev = idev->dev;
04561c1f
TG		 4513 struct ifinfomsg *hdr;
4514 struct nlmsghdr *nlh;
4515 void *protoinfo;
04561c1f 4516
15e47304 4517 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags);
04561c1f 4518 if (nlh == NULL)
26932566 4519 return -EMSGSIZE;
04561c1f
TG		 4520
4521 hdr = nlmsg_data(nlh);
4522 hdr->ifi_family = AF_INET6;
4523 hdr->__ifi_pad = 0;
4524 hdr->ifi_type = dev->type;
4525 hdr->ifi_index = dev->ifindex;
4526 hdr->ifi_flags = dev_get_flags(dev);
4527 hdr->ifi_change = 0;
4528
c78679e8
DM		 4529 if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
4530 (dev->addr_len &&
4531 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
4532 nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
4533 (dev->ifindex != dev->iflink &&
4534 nla_put_u32(skb, IFLA_LINK, dev->iflink)))
4535 goto nla_put_failure;
04561c1f
TG		 4536 protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
4537 if (protoinfo == NULL)
4538 goto nla_put_failure;
1da177e4 4539
b382b191 4540 if (inet6_fill_ifla6_attrs(skb, idev) < 0)
bf99f1bd 4541 goto nla_put_failure;
1da177e4 4542
04561c1f
TG		 4543 nla_nest_end(skb, protoinfo);
4544 return nlmsg_end(skb, nlh);
1da177e4 4545
04561c1f 4546nla_put_failure:
26932566
PM		 4547 nlmsg_cancel(skb, nlh);
4548 return -EMSGSIZE;
1da177e4
LT		 4549}
4550
4551static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
4552{
3b1e0a65 4553 struct net *net = sock_net(skb->sk);
84d2697d 4554 int h, s_h;
434a8a58 4555 int idx = 0, s_idx;
1da177e4
LT		 4556 struct net_device *dev;
4557 struct inet6_dev *idev;
84d2697d 4558 struct hlist_head *head;
1da177e4 4559
84d2697d
ED		 4560 s_h = cb->args[0];
4561 s_idx = cb->args[1];
4562
4563 rcu_read_lock();
4564 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4565 idx = 0;
4566 head = &net->dev_index_head[h];
b67bfe0d 4567 hlist_for_each_entry_rcu(dev, head, index_hlist) {
84d2697d
ED		 4568 if (idx < s_idx)
4569 goto cont;
4570 idev = __in6_dev_get(dev);
4571 if (!idev)
4572 goto cont;
4573 if (inet6_fill_ifinfo(skb, idev,
15e47304 4574 NETLINK_CB(cb->skb).portid,
84d2697d
ED		 4575 cb->nlh->nlmsg_seq,
4576 RTM_NEWLINK, NLM_F_MULTI) <= 0)
4577 goto out;
7562f876 4578cont:
84d2697d
ED		 4579 idx++;
4580 }
1da177e4 4581 }
84d2697d
ED		 4582out:
4583 rcu_read_unlock();
4584 cb->args[1] = idx;
4585 cb->args[0] = h;
1da177e4
LT		 4586
4587 return skb->len;
4588}
4589
4590void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
4591{
4592 struct sk_buff *skb;
c346dca1 4593 struct net *net = dev_net(idev->dev);
8d7a76c9 4594 int err = -ENOBUFS;
1ab1457c 4595
339bf98f 4596 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
8d7a76c9
TG		 4597 if (skb == NULL)
4598 goto errout;
4599
4600 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
26932566
PM		 4601 if (err < 0) {
4602 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
4603 WARN_ON(err == -EMSGSIZE);
4604 kfree_skb(skb);
4605 goto errout;
4606 }
5f75a104 4607 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC);
1ce85fe4 4608 return;
8d7a76c9
TG		 4609errout:
4610 if (err < 0)
5f75a104 4611 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err);
1da177e4
LT		 4612}
4613
339bf98f
TG		 4614static inline size_t inet6_prefix_nlmsg_size(void)
4615{
4616 return NLMSG_ALIGN(sizeof(struct prefixmsg))
4617 + nla_total_size(sizeof(struct in6_addr))
4618 + nla_total_size(sizeof(struct prefix_cacheinfo));
4619}
c5396a31 4620
1da177e4 4621static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
15e47304 4622 struct prefix_info *pinfo, u32 portid, u32 seq,
6051e2f4 4623 int event, unsigned int flags)
1da177e4 4624{
6051e2f4
TG		 4625 struct prefixmsg *pmsg;
4626 struct nlmsghdr *nlh;
1da177e4
LT		 4627 struct prefix_cacheinfo ci;
4628
15e47304 4629 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags);
6051e2f4 4630 if (nlh == NULL)
26932566 4631 return -EMSGSIZE;
6051e2f4
TG		 4632
4633 pmsg = nlmsg_data(nlh);
1da177e4 4634 pmsg->prefix_family = AF_INET6;
8a47077a
PM		 4635 pmsg->prefix_pad1 = 0;
4636 pmsg->prefix_pad2 = 0;
1da177e4
LT		 4637 pmsg->prefix_ifindex = idev->dev->ifindex;
4638 pmsg->prefix_len = pinfo->prefix_len;
4639 pmsg->prefix_type = pinfo->type;
8a47077a 4640 pmsg->prefix_pad3 = 0;
1da177e4
LT		 4641 pmsg->prefix_flags = 0;
4642 if (pinfo->onlink)
4643 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
4644 if (pinfo->autoconf)
4645 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
4646
c78679e8
DM		 4647 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix))
4648 goto nla_put_failure;
1da177e4
LT		 4649 ci.preferred_time = ntohl(pinfo->prefered);
4650 ci.valid_time = ntohl(pinfo->valid);
c78679e8
DM		 4651 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci))
4652 goto nla_put_failure;
6051e2f4 4653 return nlmsg_end(skb, nlh);
1da177e4 4654
6051e2f4 4655nla_put_failure:
26932566
PM		 4656 nlmsg_cancel(skb, nlh);
4657 return -EMSGSIZE;
1da177e4
LT		 4658}
4659
1ab1457c 4660static void inet6_prefix_notify(int event, struct inet6_dev *idev,
1da177e4
LT		 4661 struct prefix_info *pinfo)
4662{
4663 struct sk_buff *skb;
c346dca1 4664 struct net *net = dev_net(idev->dev);
8c384bfa 4665 int err = -ENOBUFS;
1da177e4 4666
339bf98f 4667 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
8c384bfa
TG		 4668 if (skb == NULL)
4669 goto errout;
4670
4671 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
26932566
PM		 4672 if (err < 0) {
4673 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
4674 WARN_ON(err == -EMSGSIZE);
4675 kfree_skb(skb);
4676 goto errout;
4677 }
1ce85fe4
PNA		 4678 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
4679 return;
8c384bfa
TG		 4680errout:
4681 if (err < 0)
6fda7350 4682 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
1da177e4
LT		 4683}
4684
1da177e4
LT		 4685static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4686{
63998ac2
ND		 4687 struct net *net = dev_net(ifp->idev->dev);
4688
835b474b
HFS		 4689 if (event)
4690 ASSERT_RTNL();
4691
1da177e4
LT		 4692 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
4693
4694 switch (event) {
4695 case RTM_NEWADDR:
95c385b4
NH		 4696 /*
4697 * If the address was optimistic
4698 * we inserted the route at the start of
4699 * our DAD process, so we don't need
4700 * to do it again
4701 */
4702 if (!(ifp->rt->rt6i_node))
4703 ip6_ins_rt(ifp->rt);
1da177e4
LT		 4704 if (ifp->idev->cnf.forwarding)
4705 addrconf_join_anycast(ifp);
4706 break;
4707 case RTM_DELADDR:
4708 if (ifp->idev->cnf.forwarding)
4709 addrconf_leave_anycast(ifp);
4710 addrconf_leave_solict(ifp->idev, &ifp->addr);
d8d1f30b 4711 dst_hold(&ifp->rt->dst);
93fa159a 4712
73a8bd74 4713 if (ip6_del_rt(ifp->rt))
d8d1f30b 4714 dst_free(&ifp->rt->dst);
1da177e4
LT		 4715 break;
4716 }
63998ac2 4717 atomic_inc(&net->ipv6.dev_addr_genid);
1da177e4
LT		 4718}
4719
4720static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4721{
8814c4b5 4722 rcu_read_lock_bh();
1da177e4
LT		 4723 if (likely(ifp->idev->dead == 0))
4724 __ipv6_ifa_notify(event, ifp);
8814c4b5 4725 rcu_read_unlock_bh();
1da177e4
LT		 4726}
4727
4728#ifdef CONFIG_SYSCTL
4729
4730static
8d65af78 4731int addrconf_sysctl_forward(ctl_table *ctl, int write,
1da177e4
LT		 4732 void __user *buffer, size_t *lenp, loff_t *ppos)
4733{
4734 int *valp = ctl->data;
4735 int val = *valp;
88af182e 4736 loff_t pos = *ppos;
013d97e9 4737 ctl_table lctl;
1da177e4
LT		 4738 int ret;
4739
013d97e9
FR		 4740 /*
4741 * ctl->data points to idev->cnf.forwarding, we should
4742 * not modify it until we get the rtnl lock.
4743 */
4744 lctl = *ctl;
4745 lctl.data = &val;
4746
4747 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
1da177e4 4748
c8fecf22 4749 if (write)
b325fddb 4750 ret = addrconf_fixup_forwarding(ctl, valp, val);
88af182e
EB		 4751 if (ret)
4752 *ppos = pos;
1ab1457c 4753 return ret;
1da177e4
LT		 4754}
4755
56d417b1
BH		 4756static void dev_disable_change(struct inet6_dev *idev)
4757{
4758 if (!idev || !idev->dev)
4759 return;
4760
4761 if (idev->cnf.disable_ipv6)
4762 addrconf_notify(NULL, NETDEV_DOWN, idev->dev);
4763 else
4764 addrconf_notify(NULL, NETDEV_UP, idev->dev);
4765}
4766
4767static void addrconf_disable_change(struct net *net, __s32 newf)
4768{
4769 struct net_device *dev;
4770 struct inet6_dev *idev;
4771
cba3e28f 4772 for_each_netdev(net, dev) {
56d417b1
BH		 4773 idev = __in6_dev_get(dev);
4774 if (idev) {
4775 int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
4776 idev->cnf.disable_ipv6 = newf;
4777 if (changed)
4778 dev_disable_change(idev);
4779 }
56d417b1 4780 }
56d417b1
BH		 4781}
4782
013d97e9 4783static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf)
56d417b1
BH		 4784{
4785 struct net *net;
013d97e9
FR		 4786 int old;
4787
4788 if (!rtnl_trylock())
4789 return restart_syscall();
56d417b1
BH		 4790
4791 net = (struct net *)table->extra2;
013d97e9
FR		 4792 old = *p;
4793 *p = newf;
56d417b1 4794
013d97e9
FR		 4795 if (p == &net->ipv6.devconf_dflt->disable_ipv6) {
4796 rtnl_unlock();
56d417b1 4797 return 0;
88af182e 4798 }
56d417b1
BH		 4799
4800 if (p == &net->ipv6.devconf_all->disable_ipv6) {
56d417b1
BH		 4801 net->ipv6.devconf_dflt->disable_ipv6 = newf;
4802 addrconf_disable_change(net, newf);
013d97e9 4803 } else if ((!newf) ^ (!old))
56d417b1
BH		 4804 dev_disable_change((struct inet6_dev *)table->extra1);
4805
4806 rtnl_unlock();
4807 return 0;
4808}
4809
4810static
8d65af78 4811int addrconf_sysctl_disable(ctl_table *ctl, int write,
56d417b1
BH		 4812 void __user *buffer, size_t *lenp, loff_t *ppos)
4813{
4814 int *valp = ctl->data;
4815 int val = *valp;
88af182e 4816 loff_t pos = *ppos;
013d97e9 4817 ctl_table lctl;
56d417b1
BH		 4818 int ret;
4819
013d97e9
FR		 4820 /*
4821 * ctl->data points to idev->cnf.disable_ipv6, we should
4822 * not modify it until we get the rtnl lock.
4823 */
4824 lctl = *ctl;
4825 lctl.data = &val;
4826
4827 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
56d417b1
BH		 4828
4829 if (write)
4830 ret = addrconf_disable_ipv6(ctl, valp, val);
88af182e
EB		 4831 if (ret)
4832 *ppos = pos;
56d417b1
BH		 4833 return ret;
4834}
4835
1da177e4
LT		 4836static struct addrconf_sysctl_table
4837{
4838 struct ctl_table_header *sysctl_header;
f6a07b29 4839 ctl_table addrconf_vars[DEVCONF_MAX+1];
ab32ea5d 4840} addrconf_sysctl __read_mostly = {
1da177e4
LT		 4841 .sysctl_header = NULL,
4842 .addrconf_vars = {
1ab1457c 4843 {
e21e8467
SH		 4844 .procname = "forwarding",
4845 .data = &ipv6_devconf.forwarding,
4846 .maxlen = sizeof(int),
4847 .mode = 0644,
4848 .proc_handler = addrconf_sysctl_forward,
1da177e4
LT		 4849 },
4850 {
e21e8467
SH		 4851 .procname = "hop_limit",
4852 .data = &ipv6_devconf.hop_limit,
4853 .maxlen = sizeof(int),
4854 .mode = 0644,
4855 .proc_handler = proc_dointvec,
1da177e4
LT		 4856 },
4857 {
e21e8467
SH		 4858 .procname = "mtu",
4859 .data = &ipv6_devconf.mtu6,
4860 .maxlen = sizeof(int),
4861 .mode = 0644,
4862 .proc_handler = proc_dointvec,
1da177e4
LT		 4863 },
4864 {
e21e8467
SH		 4865 .procname = "accept_ra",
4866 .data = &ipv6_devconf.accept_ra,
4867 .maxlen = sizeof(int),
4868 .mode = 0644,
4869 .proc_handler = proc_dointvec,
1da177e4
LT		 4870 },
4871 {
e21e8467
SH		 4872 .procname = "accept_redirects",
4873 .data = &ipv6_devconf.accept_redirects,
4874 .maxlen = sizeof(int),
4875 .mode = 0644,
4876 .proc_handler = proc_dointvec,
1da177e4
LT		 4877 },
4878 {
e21e8467
SH		 4879 .procname = "autoconf",
4880 .data = &ipv6_devconf.autoconf,
4881 .maxlen = sizeof(int),
4882 .mode = 0644,
4883 .proc_handler = proc_dointvec,
1da177e4
LT		 4884 },
4885 {
e21e8467
SH		 4886 .procname = "dad_transmits",
4887 .data = &ipv6_devconf.dad_transmits,
4888 .maxlen = sizeof(int),
4889 .mode = 0644,
4890 .proc_handler = proc_dointvec,
1da177e4
LT		 4891 },
4892 {
e21e8467
SH		 4893 .procname = "router_solicitations",
4894 .data = &ipv6_devconf.rtr_solicits,
4895 .maxlen = sizeof(int),
4896 .mode = 0644,
4897 .proc_handler = proc_dointvec,
1da177e4
LT		 4898 },
4899 {
e21e8467
SH		 4900 .procname = "router_solicitation_interval",
4901 .data = &ipv6_devconf.rtr_solicit_interval,
4902 .maxlen = sizeof(int),
4903 .mode = 0644,
4904 .proc_handler = proc_dointvec_jiffies,
1da177e4
LT		 4905 },
4906 {
e21e8467
SH		 4907 .procname = "router_solicitation_delay",
4908 .data = &ipv6_devconf.rtr_solicit_delay,
4909 .maxlen = sizeof(int),
4910 .mode = 0644,
4911 .proc_handler = proc_dointvec_jiffies,
1da177e4
LT		 4912 },
4913 {
e21e8467
SH		 4914 .procname = "force_mld_version",
4915 .data = &ipv6_devconf.force_mld_version,
4916 .maxlen = sizeof(int),
4917 .mode = 0644,
4918 .proc_handler = proc_dointvec,
1da177e4
LT		 4919 },
4920#ifdef CONFIG_IPV6_PRIVACY
4921 {
e21e8467
SH		 4922 .procname = "use_tempaddr",
4923 .data = &ipv6_devconf.use_tempaddr,
4924 .maxlen = sizeof(int),
4925 .mode = 0644,
4926 .proc_handler = proc_dointvec,
1da177e4
LT		 4927 },
4928 {
e21e8467
SH		 4929 .procname = "temp_valid_lft",
4930 .data = &ipv6_devconf.temp_valid_lft,
4931 .maxlen = sizeof(int),
4932 .mode = 0644,
4933 .proc_handler = proc_dointvec,
1da177e4
LT		 4934 },
4935 {
e21e8467
SH		 4936 .procname = "temp_prefered_lft",
4937 .data = &ipv6_devconf.temp_prefered_lft,
4938 .maxlen = sizeof(int),
4939 .mode = 0644,
4940 .proc_handler = proc_dointvec,
1da177e4
LT		 4941 },
4942 {
e21e8467
SH		 4943 .procname = "regen_max_retry",
4944 .data = &ipv6_devconf.regen_max_retry,
4945 .maxlen = sizeof(int),
4946 .mode = 0644,
4947 .proc_handler = proc_dointvec,
1da177e4
LT		 4948 },
4949 {
e21e8467
SH		 4950 .procname = "max_desync_factor",
4951 .data = &ipv6_devconf.max_desync_factor,
4952 .maxlen = sizeof(int),
4953 .mode = 0644,
4954 .proc_handler = proc_dointvec,
1da177e4
LT		 4955 },
4956#endif
4957 {
e21e8467
SH		 4958 .procname = "max_addresses",
4959 .data = &ipv6_devconf.max_addresses,
4960 .maxlen = sizeof(int),
4961 .mode = 0644,
4962 .proc_handler = proc_dointvec,
1da177e4 4963 },
65f5c7c1 4964 {
e21e8467
SH		 4965 .procname = "accept_ra_defrtr",
4966 .data = &ipv6_devconf.accept_ra_defrtr,
4967 .maxlen = sizeof(int),
4968 .mode = 0644,
4969 .proc_handler = proc_dointvec,
65f5c7c1 4970 },
c4fd30eb 4971 {
e21e8467
SH		 4972 .procname = "accept_ra_pinfo",
4973 .data = &ipv6_devconf.accept_ra_pinfo,
4974 .maxlen = sizeof(int),
4975 .mode = 0644,
4976 .proc_handler = proc_dointvec,
c4fd30eb 4977 },
930d6ff2
YH		 4978#ifdef CONFIG_IPV6_ROUTER_PREF
4979 {
e21e8467
SH		 4980 .procname = "accept_ra_rtr_pref",
4981 .data = &ipv6_devconf.accept_ra_rtr_pref,
4982 .maxlen = sizeof(int),
4983 .mode = 0644,
4984 .proc_handler = proc_dointvec,
930d6ff2 4985 },
52e16356 4986 {
e21e8467
SH		 4987 .procname = "router_probe_interval",
4988 .data = &ipv6_devconf.rtr_probe_interval,
4989 .maxlen = sizeof(int),
4990 .mode = 0644,
4991 .proc_handler = proc_dointvec_jiffies,
52e16356 4992 },
fa03ef38 4993#ifdef CONFIG_IPV6_ROUTE_INFO
09c884d4 4994 {
e21e8467
SH		 4995 .procname = "accept_ra_rt_info_max_plen",
4996 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
4997 .maxlen = sizeof(int),
4998 .mode = 0644,
4999 .proc_handler = proc_dointvec,
09c884d4
YH		 5000 },
5001#endif
930d6ff2 5002#endif
fbea49e1 5003 {
e21e8467
SH		 5004 .procname = "proxy_ndp",
5005 .data = &ipv6_devconf.proxy_ndp,
5006 .maxlen = sizeof(int),
5007 .mode = 0644,
5008 .proc_handler = proc_dointvec,
fbea49e1 5009 },
0bcbc926 5010 {
e21e8467
SH		 5011 .procname = "accept_source_route",
5012 .data = &ipv6_devconf.accept_source_route,
5013 .maxlen = sizeof(int),
5014 .mode = 0644,
5015 .proc_handler = proc_dointvec,
0bcbc926 5016 },
95c385b4
NH		 5017#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
5018 {
e21e8467
SH		 5019 .procname = "optimistic_dad",
5020 .data = &ipv6_devconf.optimistic_dad,
5021 .maxlen = sizeof(int),
5022 .mode = 0644,
5023 .proc_handler = proc_dointvec,
95c385b4
NH		 5024
5025 },
7bc570c8
YH		 5026#endif
5027#ifdef CONFIG_IPV6_MROUTE
5028 {
e21e8467
SH		 5029 .procname = "mc_forwarding",
5030 .data = &ipv6_devconf.mc_forwarding,
5031 .maxlen = sizeof(int),
5032 .mode = 0444,
5033 .proc_handler = proc_dointvec,
7bc570c8 5034 },
95c385b4 5035#endif
778d80be 5036 {
e21e8467
SH		 5037 .procname = "disable_ipv6",
5038 .data = &ipv6_devconf.disable_ipv6,
5039 .maxlen = sizeof(int),
5040 .mode = 0644,
5041 .proc_handler = addrconf_sysctl_disable,
778d80be 5042 },
1b34be74 5043 {
e21e8467
SH		 5044 .procname = "accept_dad",
5045 .data = &ipv6_devconf.accept_dad,
5046 .maxlen = sizeof(int),
5047 .mode = 0644,
5048 .proc_handler = proc_dointvec,
1b34be74 5049 },
f7734fdf 5050 {
f7734fdf
OP		 5051 .procname = "force_tllao",
5052 .data = &ipv6_devconf.force_tllao,
5053 .maxlen = sizeof(int),
5054 .mode = 0644,
5055 .proc_handler = proc_dointvec
5056 },
5cb04436
HFS		 5057 {
5058 .procname = "ndisc_notify",
5059 .data = &ipv6_devconf.ndisc_notify,
5060 .maxlen = sizeof(int),
5061 .mode = 0644,
5062 .proc_handler = proc_dointvec
5063 },
1da177e4 5064 {
f8572d8f 5065 /* sentinel */
1da177e4
LT		 5066 }
5067 },
1da177e4
LT		 5068};
5069
bff16c2f 5070static int __addrconf_sysctl_register(struct net *net, char *dev_name,
f8572d8f 5071 struct inet6_dev *idev, struct ipv6_devconf *p)
1da177e4
LT		 5072{
5073 int i;
1da177e4 5074 struct addrconf_sysctl_table *t;
6105e293 5075 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ];
1dab6222 5076
af879cc7 5077 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
1da177e4 5078 if (t == NULL)
f68635e6
PE		 5079 goto out;
5080
bcdd553f 5081 for (i = 0; t->addrconf_vars[i].data; i++) {
e21e8467 5082 t->addrconf_vars[i].data += (char *)p - (char *)&ipv6_devconf;
1da177e4 5083 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
bff16c2f 5084 t->addrconf_vars[i].extra2 = net;
1da177e4 5085 }
1da177e4 5086
6105e293 5087 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name);
1da177e4 5088
6105e293 5089 t->sysctl_header = register_net_sysctl(net, path, t->addrconf_vars);
1da177e4 5090 if (t->sysctl_header == NULL)
6105e293 5091 goto free;
f68635e6
PE		 5092
5093 p->sysctl = t;
95897312 5094 return 0;
1da177e4 5095
f68635e6 5096free:
1da177e4 5097 kfree(t);
f68635e6 5098out:
95897312 5099 return -ENOBUFS;
1da177e4
LT		 5100}
5101
408c4768
PE		 5102static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
5103{
5104 struct addrconf_sysctl_table *t;
5105
5106 if (p->sysctl == NULL)
5107 return;
5108
5109 t = p->sysctl;
5110 p->sysctl = NULL;
ff538818 5111 unregister_net_sysctl_table(t->sysctl_header);
408c4768
PE		 5112 kfree(t);
5113}
5114
f52295a9
PE		 5115static void addrconf_sysctl_register(struct inet6_dev *idev)
5116{
54716e3b 5117 neigh_sysctl_register(idev->dev, idev->nd_parms, "ipv6",
f8572d8f 5118 &ndisc_ifinfo_sysctl_change);
c346dca1 5119 __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
f8572d8f 5120 idev, &idev->cnf);
f52295a9
PE		 5121}
5122
408c4768 5123static void addrconf_sysctl_unregister(struct inet6_dev *idev)
1da177e4 5124{
408c4768
PE		 5125 __addrconf_sysctl_unregister(&idev->cnf);
5126 neigh_sysctl_unregister(idev->nd_parms);
1da177e4
LT		 5127}
5128
5129
5130#endif
5131
2c8c1e72 5132static int __net_init addrconf_init_net(struct net *net)
e0da5a48 5133{
a79ca223 5134 int err = -ENOMEM;
e0da5a48
PE		 5135 struct ipv6_devconf *all, *dflt;
5136
a79ca223
HZ		 5137 all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL);
5138 if (all == NULL)
5139 goto err_alloc_all;
e0da5a48 5140
a79ca223
HZ		 5141 dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
5142 if (dflt == NULL)
5143 goto err_alloc_dflt;
e0da5a48 5144
a79ca223
HZ		 5145 /* these will be inherited by all namespaces */
5146 dflt->autoconf = ipv6_defaults.autoconf;
5147 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
e0da5a48
PE		 5148
5149 net->ipv6.devconf_all = all;
5150 net->ipv6.devconf_dflt = dflt;
5151
5152#ifdef CONFIG_SYSCTL
f8572d8f 5153 err = __addrconf_sysctl_register(net, "all", NULL, all);
e0da5a48
PE		 5154 if (err < 0)
5155 goto err_reg_all;
5156
f8572d8f 5157 err = __addrconf_sysctl_register(net, "default", NULL, dflt);
e0da5a48
PE		 5158 if (err < 0)
5159 goto err_reg_dflt;
5160#endif
5161 return 0;
5162
5163#ifdef CONFIG_SYSCTL
5164err_reg_dflt:
5165 __addrconf_sysctl_unregister(all);
5166err_reg_all:
5167 kfree(dflt);
5168#endif
5169err_alloc_dflt:
5170 kfree(all);
5171err_alloc_all:
5172 return err;
5173}
5174
2c8c1e72 5175static void __net_exit addrconf_exit_net(struct net *net)
e0da5a48
PE		 5176{
5177#ifdef CONFIG_SYSCTL
5178 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
5179 __addrconf_sysctl_unregister(net->ipv6.devconf_all);
5180#endif
09ad9bc7 5181 if (!net_eq(net, &init_net)) {
e0da5a48
PE		 5182 kfree(net->ipv6.devconf_dflt);
5183 kfree(net->ipv6.devconf_all);
5184 }
5185}
5186
5187static struct pernet_operations addrconf_ops = {
5188 .init = addrconf_init_net,
5189 .exit = addrconf_exit_net,
5190};
5191
b382b191
TG		 5192static struct rtnl_af_ops inet6_ops = {
5193 .family = AF_INET6,
5194 .fill_link_af = inet6_fill_link_af,
5195 .get_link_af_size = inet6_get_link_af_size,
f53adae4 5196 .set_link_af = inet6_set_link_af,
b382b191
TG		 5197};
5198
1da177e4
LT		 5199/*
5200 * Init / cleanup code
5201 */
5202
5203int __init addrconf_init(void)
5204{
c2e21293 5205 int i, err;
2a8cc6c8 5206
e21e8467
SH		 5207 err = ipv6_addr_label_init();
5208 if (err < 0) {
f3213831
JP		 5209 pr_crit("%s: cannot initialize default policy table: %d\n",
5210 __func__, err);
2cc6d2bf 5211 goto out;
2a8cc6c8 5212 }
1da177e4 5213
2cc6d2bf
NH		 5214 err = register_pernet_subsys(&addrconf_ops);
5215 if (err < 0)
5216 goto out_addrlabel;
e0da5a48 5217
835b474b
HFS		 5218 addrconf_wq = create_workqueue("ipv6_addrconf");
5219 if (!addrconf_wq) {
5220 err = -ENOMEM;
5221 goto out_nowq;
5222 }
5223
1da177e4
LT		 5224 /* The addrconf netdev notifier requires that loopback_dev
5225 * has it's ipv6 private information allocated and setup
5226 * before it can bring up and give link-local addresses
5227 * to other devices which are up.
5228 *
5229 * Unfortunately, loopback_dev is not necessarily the first
5230 * entry in the global dev_base list of net devices. In fact,
5231 * it is likely to be the very last entry on that list.
5232 * So this causes the notifier registry below to try and
5233 * give link-local addresses to all devices besides loopback_dev
5234 * first, then loopback_dev, which cases all the non-loopback_dev
5235 * devices to fail to get a link-local address.
5236 *
5237 * So, as a temporary fix, allocate the ipv6 structure for
5238 * loopback_dev first by hand.
5239 * Longer term, all of the dependencies ipv6 has upon the loopback
5240 * device and it being up should be removed.
5241 */
5242 rtnl_lock();
2774c7ab 5243 if (!ipv6_add_dev(init_net.loopback_dev))
1da177e4
LT		 5244 err = -ENOMEM;
5245 rtnl_unlock();
5246 if (err)
e0da5a48 5247 goto errlo;
1da177e4 5248
c2e21293 5249 for (i = 0; i < IN6_ADDR_HSIZE; i++)
5250 INIT_HLIST_HEAD(&inet6_addr_lst[i]);
5251
1da177e4
LT		 5252 register_netdevice_notifier(&ipv6_dev_notf);
5253
835b474b 5254 addrconf_verify();
c127ea2c 5255
b382b191
TG		 5256 err = rtnl_af_register(&inet6_ops);
5257 if (err < 0)
5258 goto errout_af;
5259
c7ac8679
GR		 5260 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo,
5261 NULL);
c127ea2c
TG		 5262 if (err < 0)
5263 goto errout;
5264
5265 /* Only the first call to __rtnl_register can fail */
c7ac8679
GR		 5266 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL, NULL);
5267 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL, NULL);
5268 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr,
5269 inet6_dump_ifaddr, NULL);
5270 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL,
5271 inet6_dump_ifmcaddr, NULL);
5272 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL,
5273 inet6_dump_ifacaddr, NULL);
76f8f6cb 5274 __rtnl_register(PF_INET6, RTM_GETNETCONF, inet6_netconf_get_devconf,
7a674200 5275 inet6_netconf_dump_devconf, NULL);
c127ea2c 5276
2a8cc6c8
YH		 5277 ipv6_addr_label_rtnl_register();
5278
1da177e4 5279 return 0;
c127ea2c 5280errout:
b382b191
TG		 5281 rtnl_af_unregister(&inet6_ops);
5282errout_af:
c127ea2c 5283 unregister_netdevice_notifier(&ipv6_dev_notf);
e0da5a48 5284errlo:
835b474b
HFS		 5285 destroy_workqueue(addrconf_wq);
5286out_nowq:
e0da5a48 5287 unregister_pernet_subsys(&addrconf_ops);
2cc6d2bf
NH		 5288out_addrlabel:
5289 ipv6_addr_label_cleanup();
5290out:
c127ea2c 5291 return err;
1da177e4
LT		 5292}
5293
09f7709f 5294void addrconf_cleanup(void)
1da177e4 5295{
176c39af 5296 struct net_device *dev;
1da177e4
LT		 5297 int i;
5298
5299 unregister_netdevice_notifier(&ipv6_dev_notf);
e0da5a48 5300 unregister_pernet_subsys(&addrconf_ops);
2cc6d2bf 5301 ipv6_addr_label_cleanup();
1da177e4
LT		 5302
5303 rtnl_lock();
5304
b382b191
TG		 5305 __rtnl_af_unregister(&inet6_ops);
5306
176c39af
DL		 5307 /* clean dev list */
5308 for_each_netdev(&init_net, dev) {
5309 if (__in6_dev_get(dev) == NULL)
5310 continue;
5311 addrconf_ifdown(dev, 1);
5312 }
5313 addrconf_ifdown(init_net.loopback_dev, 2);
5314
1da177e4
LT		 5315 /*
5316 * Check hash table.
5317 */
5c578aed 5318 spin_lock_bh(&addrconf_hash_lock);
c2e21293 5319 for (i = 0; i < IN6_ADDR_HSIZE; i++)
5320 WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
5c578aed 5321 spin_unlock_bh(&addrconf_hash_lock);
835b474b 5322 cancel_delayed_work(&addr_chk_work);
1da177e4 5323 rtnl_unlock();
835b474b
HFS		 5324
5325 destroy_workqueue(addrconf_wq);
1da177e4 5326}
kernel source for telekom puls (alcatel/mediatek)