projects / linux-block.git / blame
? search:
summary | shortlog | log | commit | commitdiff | tree
blob | blame (incremental) | history | HEAD
Merge branch 's390-next'
[linux-block.git] / net / ipv6 / addrconf.c
CommitLineData
1da177e4
LT		 1/*
2 * IPv6 Address [auto]configuration
3 * Linux INET6 implementation
4 *
5 * Authors:
1ab1457c 6 * Pedro Roque <roque@di.fc.ul.pt>
1da177e4
LT		 7 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
8 *
1da177e4
LT		 9 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License
11 * as published by the Free Software Foundation; either version
12 * 2 of the License, or (at your option) any later version.
13 */
14
15/*
16 * Changes:
17 *
18 * Janos Farkas : delete timer on ifdown
19 * <chexum@bankinf.banki.hu>
20 * Andi Kleen : kill double kfree on module
21 * unload.
22 * Maciej W. Rozycki : FDDI support
23 * sekiya@USAGI : Don't send too many RS
24 * packets.
25 * yoshfuji@USAGI : Fixed interval between DAD
26 * packets.
27 * YOSHIFUJI Hideaki @USAGI : improved accuracy of
28 * address validation timer.
29 * YOSHIFUJI Hideaki @USAGI : Privacy Extensions (RFC3041)
30 * support.
31 * Yuji SEKIYA @USAGI : Don't assign a same IPv6
32 * address on a same interface.
33 * YOSHIFUJI Hideaki @USAGI : ARCnet support
34 * YOSHIFUJI Hideaki @USAGI : convert /proc/net/if_inet6 to
35 * seq_file.
b1cacb68
YH		 36 * YOSHIFUJI Hideaki @USAGI : improved source address
37 * selection; consider scope,
38 * status etc.
1da177e4
LT		 39 */
40
f3213831
JP		 41#define pr_fmt(fmt) "IPv6: " fmt
42
1da177e4
LT		 43#include <linux/errno.h>
44#include <linux/types.h>
a0bffffc 45#include <linux/kernel.h>
174cd4b1 46#include <linux/sched/signal.h>
1da177e4
LT		 47#include <linux/socket.h>
48#include <linux/sockios.h>
1da177e4 49#include <linux/net.h>
3d1bec99 50#include <linux/inet.h>
1da177e4
LT		 51#include <linux/in6.h>
52#include <linux/netdevice.h>
1823730f 53#include <linux/if_addr.h>
1da177e4
LT		 54#include <linux/if_arp.h>
55#include <linux/if_arcnet.h>
56#include <linux/if_infiniband.h>
57#include <linux/route.h>
58#include <linux/inetdevice.h>
59#include <linux/init.h>
5a0e3ad6 60#include <linux/slab.h>
1da177e4
LT		 61#ifdef CONFIG_SYSCTL
62#include <linux/sysctl.h>
63#endif
4fc268d2 64#include <linux/capability.h>
1da177e4
LT		 65#include <linux/delay.h>
66#include <linux/notifier.h>
543537bd 67#include <linux/string.h>
ddbe5032 68#include <linux/hash.h>
1da177e4 69
457c4cbc 70#include <net/net_namespace.h>
1da177e4
LT		 71#include <net/sock.h>
72#include <net/snmp.h>
73
5241c2d7 74#include <net/6lowpan.h>
cb6bf355 75#include <net/firewire.h>
1da177e4
LT		 76#include <net/ipv6.h>
77#include <net/protocol.h>
78#include <net/ndisc.h>
79#include <net/ip6_route.h>
80#include <net/addrconf.h>
81#include <net/tcp.h>
82#include <net/ip.h>
5d620266 83#include <net/netlink.h>
f24e3d65 84#include <net/pkt_sched.h>
ca254490 85#include <net/l3mdev.h>
1da177e4
LT		 86#include <linux/if_tunnel.h>
87#include <linux/rtnetlink.h>
f3a1bfb1 88#include <linux/netconf.h>
1da177e4 89#include <linux/random.h>
e21e8467 90#include <linux/uaccess.h>
7f7d9a6b 91#include <asm/unaligned.h>
1da177e4
LT		 92
93#include <linux/proc_fs.h>
94#include <linux/seq_file.h>
bc3b2d7f 95#include <linux/export.h>
1da177e4
LT		 96
97/* Set to 3 to get tracing... */
98#define ACONF_DEBUG 2
99
100#if ACONF_DEBUG >= 3
ba3542e1 101#define ADBG(fmt, ...) printk(fmt, ##__VA_ARGS__)
1da177e4 102#else
ba3542e1 103#define ADBG(fmt, ...) do { if (0) printk(fmt, ##__VA_ARGS__); } while (0)
1da177e4
LT		 104#endif
105
106#define INFINITY_LIFE_TIME 0xFFFFFFFF
18a31e1e 107
3d1bec99
HFS		 108#define IPV6_MAX_STRLEN \
109 sizeof("ffff:ffff:ffff:ffff:ffff:ffff:255.255.255.255")
110
18a31e1e
TG		 111static inline u32 cstamp_delta(unsigned long cstamp)
112{
113 return (cstamp - INITIAL_JIFFIES) * 100UL / HZ;
114}
1da177e4 115
bd11f074
MŻ		 116static inline s32 rfc3315_s14_backoff_init(s32 irt)
117{
118 /* multiply 'initial retransmission time' by 0.9 .. 1.1 */
119 u64 tmp = (900000 + prandom_u32() % 200001) * (u64)irt;
120 do_div(tmp, 1000000);
121 return (s32)tmp;
122}
123
124static inline s32 rfc3315_s14_backoff_update(s32 rt, s32 mrt)
125{
126 /* multiply 'retransmission timeout' by 1.9 .. 2.1 */
127 u64 tmp = (1900000 + prandom_u32() % 200001) * (u64)rt;
128 do_div(tmp, 1000000);
129 if ((s32)tmp > mrt) {
130 /* multiply 'maximum retransmission time' by 0.9 .. 1.1 */
131 tmp = (900000 + prandom_u32() % 200001) * (u64)mrt;
132 do_div(tmp, 1000000);
133 }
134 return (s32)tmp;
135}
136
1da177e4 137#ifdef CONFIG_SYSCTL
a317a2f1 138static int addrconf_sysctl_register(struct inet6_dev *idev);
408c4768
PE		 139static void addrconf_sysctl_unregister(struct inet6_dev *idev);
140#else
a317a2f1 141static inline int addrconf_sysctl_register(struct inet6_dev *idev)
408c4768 142{
a317a2f1 143 return 0;
408c4768
PE		 144}
145
146static inline void addrconf_sysctl_unregister(struct inet6_dev *idev)
147{
148}
1da177e4
LT		 149#endif
150
9d6280da
JB		 151static void ipv6_regen_rndid(struct inet6_dev *idev);
152static void ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
1da177e4 153
1b34be74 154static int ipv6_generate_eui64(u8 *eui, struct net_device *dev);
d9bf82c2 155static int ipv6_count_addresses(const struct inet6_dev *idev);
622c81d5
HFS		 156static int ipv6_generate_stable_address(struct in6_addr *addr,
157 u8 dad_count,
158 const struct inet6_dev *idev);
1da177e4
LT		 159
160/*
161 * Configured unicast address hash table
162 */
c2e21293 163static struct hlist_head inet6_addr_lst[IN6_ADDR_HSIZE];
5c578aed 164static DEFINE_SPINLOCK(addrconf_hash_lock);
1da177e4 165
c15b1cca
HFS		 166static void addrconf_verify(void);
167static void addrconf_verify_rtnl(void);
168static void addrconf_verify_work(struct work_struct *);
1da177e4 169
c15b1cca
HFS		 170static struct workqueue_struct *addrconf_wq;
171static DECLARE_DELAYED_WORK(addr_chk_work, addrconf_verify_work);
1da177e4
LT		 172
173static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
174static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
175
93d9b7d7
JP		 176static void addrconf_type_change(struct net_device *dev,
177 unsigned long event);
1da177e4
LT		 178static int addrconf_ifdown(struct net_device *dev, int how);
179
21caa662
RK		 180static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
181 int plen,
182 const struct net_device *dev,
183 u32 flags, u32 noflags);
184
cf22f9a2 185static void addrconf_dad_start(struct inet6_ifaddr *ifp);
c15b1cca 186static void addrconf_dad_work(struct work_struct *w);
764d3be6 187static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id);
c5e33bdd 188static void addrconf_dad_run(struct inet6_dev *idev);
1da177e4
LT		 189static void addrconf_rs_timer(unsigned long data);
190static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
191static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
192
1ab1457c 193static void inet6_prefix_notify(int event, struct inet6_dev *idev,
1da177e4 194 struct prefix_info *pinfo);
3e81c6da
DM		 195static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
196 struct net_device *dev);
1da177e4 197
888c848e 198static struct ipv6_devconf ipv6_devconf __read_mostly = {
1da177e4
LT		 199 .forwarding = 0,
200 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
201 .mtu6 = IPV6_MIN_MTU,
202 .accept_ra = 1,
203 .accept_redirects = 1,
204 .autoconf = 1,
205 .force_mld_version = 0,
fc4eba58
HFS		 206 .mldv1_unsolicited_report_interval = 10 * HZ,
207 .mldv2_unsolicited_report_interval = HZ,
1da177e4
LT		 208 .dad_transmits = 1,
209 .rtr_solicits = MAX_RTR_SOLICITATIONS,
210 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
bd11f074 211 .rtr_solicit_max_interval = RTR_SOLICITATION_MAX_INTERVAL,
1da177e4 212 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
67ba4152 213 .use_tempaddr = 0,
1da177e4
LT		 214 .temp_valid_lft = TEMP_VALID_LIFETIME,
215 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
216 .regen_max_retry = REGEN_MAX_RETRY,
217 .max_desync_factor = MAX_DESYNC_FACTOR,
1da177e4 218 .max_addresses = IPV6_MAX_ADDRESSES,
65f5c7c1 219 .accept_ra_defrtr = 1,
d9333196 220 .accept_ra_from_local = 0,
8013d1d7 221 .accept_ra_min_hop_limit= 1,
c4fd30eb 222 .accept_ra_pinfo = 1,
930d6ff2
YH		 223#ifdef CONFIG_IPV6_ROUTER_PREF
224 .accept_ra_rtr_pref = 1,
52e16356 225 .rtr_probe_interval = 60 * HZ,
09c884d4 226#ifdef CONFIG_IPV6_ROUTE_INFO
bbea124b 227 .accept_ra_rt_info_min_plen = 0,
09c884d4
YH		 228 .accept_ra_rt_info_max_plen = 0,
229#endif
930d6ff2 230#endif
fbea49e1 231 .proxy_ndp = 0,
0bcbc926 232 .accept_source_route = 0, /* we do not accept RH0 by default. */
778d80be 233 .disable_ipv6 = 0,
1b34be74 234 .accept_dad = 1,
b800c3b9 235 .suppress_frag_ndisc = 1,
c2943f14 236 .accept_ra_mtu = 1,
3d1bec99
HFS		 237 .stable_secret = {
238 .initialized = false,
3985e8a3
EK		 239 },
240 .use_oif_addrs_only = 0,
35103d11 241 .ignore_routes_with_linkdown = 0,
f1705ec1 242 .keep_addr_on_down = 0,
1ababeba 243 .seg6_enabled = 0,
bf355b8d
DL		 244#ifdef CONFIG_IPV6_SEG6_HMAC
245 .seg6_require_hmac = 0,
246#endif
adc176c5 247 .enhanced_dad = 1,
d35a00b8 248 .addr_gen_mode = IN6_ADDR_GEN_MODE_EUI64,
df789fe7 249 .disable_policy = 0,
1da177e4
LT		 250};
251
ab32ea5d 252static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
1da177e4
LT		 253 .forwarding = 0,
254 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
255 .mtu6 = IPV6_MIN_MTU,
256 .accept_ra = 1,
257 .accept_redirects = 1,
258 .autoconf = 1,
fc4eba58
HFS		 259 .force_mld_version = 0,
260 .mldv1_unsolicited_report_interval = 10 * HZ,
261 .mldv2_unsolicited_report_interval = HZ,
1da177e4
LT		 262 .dad_transmits = 1,
263 .rtr_solicits = MAX_RTR_SOLICITATIONS,
264 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
bd11f074 265 .rtr_solicit_max_interval = RTR_SOLICITATION_MAX_INTERVAL,
1da177e4 266 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
1da177e4
LT		 267 .use_tempaddr = 0,
268 .temp_valid_lft = TEMP_VALID_LIFETIME,
269 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
270 .regen_max_retry = REGEN_MAX_RETRY,
271 .max_desync_factor = MAX_DESYNC_FACTOR,
1da177e4 272 .max_addresses = IPV6_MAX_ADDRESSES,
65f5c7c1 273 .accept_ra_defrtr = 1,
d9333196 274 .accept_ra_from_local = 0,
8013d1d7 275 .accept_ra_min_hop_limit= 1,
c4fd30eb 276 .accept_ra_pinfo = 1,
930d6ff2
YH		 277#ifdef CONFIG_IPV6_ROUTER_PREF
278 .accept_ra_rtr_pref = 1,
52e16356 279 .rtr_probe_interval = 60 * HZ,
09c884d4 280#ifdef CONFIG_IPV6_ROUTE_INFO
bbea124b 281 .accept_ra_rt_info_min_plen = 0,
09c884d4
YH		 282 .accept_ra_rt_info_max_plen = 0,
283#endif
930d6ff2 284#endif
fbea49e1 285 .proxy_ndp = 0,
0bcbc926 286 .accept_source_route = 0, /* we do not accept RH0 by default. */
778d80be 287 .disable_ipv6 = 0,
1b34be74 288 .accept_dad = 1,
b800c3b9 289 .suppress_frag_ndisc = 1,
c2943f14 290 .accept_ra_mtu = 1,
3d1bec99
HFS		 291 .stable_secret = {
292 .initialized = false,
293 },
3985e8a3 294 .use_oif_addrs_only = 0,
35103d11 295 .ignore_routes_with_linkdown = 0,
f1705ec1 296 .keep_addr_on_down = 0,
1ababeba 297 .seg6_enabled = 0,
bf355b8d
DL		 298#ifdef CONFIG_IPV6_SEG6_HMAC
299 .seg6_require_hmac = 0,
300#endif
adc176c5 301 .enhanced_dad = 1,
d35a00b8 302 .addr_gen_mode = IN6_ADDR_GEN_MODE_EUI64,
df789fe7 303 .disable_policy = 0,
1da177e4
LT		 304};
305
1f372c7b
MM		 306/* Check if link is ready: is it up and is a valid qdisc available */
307static inline bool addrconf_link_ready(const struct net_device *dev)
f24e3d65 308{
1f372c7b 309 return netif_oper_up(dev) && !qdisc_tx_is_noop(dev);
f24e3d65
MC		 310}
311
b7b1bfce 312static void addrconf_del_rs_timer(struct inet6_dev *idev)
1da177e4 313{
b7b1bfce
HFS		 314 if (del_timer(&idev->rs_timer))
315 __in6_dev_put(idev);
316}
317
c15b1cca 318static void addrconf_del_dad_work(struct inet6_ifaddr *ifp)
b7b1bfce 319{
c15b1cca 320 if (cancel_delayed_work(&ifp->dad_work))
1da177e4
LT		 321 __in6_ifa_put(ifp);
322}
323
b7b1bfce
HFS		 324static void addrconf_mod_rs_timer(struct inet6_dev *idev,
325 unsigned long when)
326{
327 if (!timer_pending(&idev->rs_timer))
328 in6_dev_hold(idev);
329 mod_timer(&idev->rs_timer, jiffies + when);
330}
1da177e4 331
c15b1cca
HFS		 332static void addrconf_mod_dad_work(struct inet6_ifaddr *ifp,
333 unsigned long delay)
1da177e4 334{
f8a894b2
XL		 335 in6_ifa_hold(ifp);
336 if (mod_delayed_work(addrconf_wq, &ifp->dad_work, delay))
337 in6_ifa_put(ifp);
1da177e4
LT		 338}
339
7f7d9a6b
HX		 340static int snmp6_alloc_dev(struct inet6_dev *idev)
341{
827da44c
JS		 342 int i;
343
698365fa
WC		 344 idev->stats.ipv6 = alloc_percpu(struct ipstats_mib);
345 if (!idev->stats.ipv6)
7f7d9a6b 346 goto err_ip;
827da44c
JS		 347
348 for_each_possible_cpu(i) {
349 struct ipstats_mib *addrconf_stats;
698365fa 350 addrconf_stats = per_cpu_ptr(idev->stats.ipv6, i);
827da44c 351 u64_stats_init(&addrconf_stats->syncp);
827da44c
JS		 352 }
353
354
be281e55
ED		 355 idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device),
356 GFP_KERNEL);
357 if (!idev->stats.icmpv6dev)
7f7d9a6b 358 goto err_icmp;
be281e55
ED		 359 idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device),
360 GFP_KERNEL);
361 if (!idev->stats.icmpv6msgdev)
14878f75 362 goto err_icmpmsg;
7f7d9a6b
HX		 363
364 return 0;
365
14878f75 366err_icmpmsg:
be281e55 367 kfree(idev->stats.icmpv6dev);
7f7d9a6b 368err_icmp:
698365fa 369 free_percpu(idev->stats.ipv6);
7f7d9a6b 370err_ip:
aaf70ec7 371 return -ENOMEM;
7f7d9a6b
HX		 372}
373
8e5e8f30 374static struct inet6_dev *ipv6_add_dev(struct net_device *dev)
1da177e4
LT		 375{
376 struct inet6_dev *ndev;
a317a2f1 377 int err = -ENOMEM;
1da177e4
LT		 378
379 ASSERT_RTNL();
380
381 if (dev->mtu < IPV6_MIN_MTU)
a317a2f1 382 return ERR_PTR(-EINVAL);
1da177e4 383
1ab1457c 384 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
63159f29 385 if (!ndev)
a317a2f1 386 return ERR_PTR(err);
322f74a4
IO		 387
388 rwlock_init(&ndev->lock);
389 ndev->dev = dev;
502a2ffd 390 INIT_LIST_HEAD(&ndev->addr_list);
b7b1bfce
HFS		 391 setup_timer(&ndev->rs_timer, addrconf_rs_timer,
392 (unsigned long)ndev);
c346dca1 393 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf));
9b29c696
HFS		 394
395 if (ndev->cnf.stable_secret.initialized)
d35a00b8 396 ndev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
9b29c696 397 else
d35a00b8 398 ndev->cnf.addr_gen_mode = ipv6_devconf_dflt.addr_gen_mode;
9b29c696 399
322f74a4 400 ndev->cnf.mtu6 = dev->mtu;
322f74a4 401 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
63159f29 402 if (!ndev->nd_parms) {
322f74a4 403 kfree(ndev);
a317a2f1 404 return ERR_PTR(err);
322f74a4 405 }
0187bdfb
BH		 406 if (ndev->cnf.forwarding)
407 dev_disable_lro(dev);
322f74a4
IO		 408 /* We refer to the device */
409 dev_hold(dev);
1da177e4 410
322f74a4 411 if (snmp6_alloc_dev(ndev) < 0) {
ba3542e1 412 ADBG(KERN_WARNING
f3213831 413 "%s: cannot allocate memory for statistics; dev=%s.\n",
ba3542e1 414 __func__, dev->name);
322f74a4 415 neigh_parms_release(&nd_tbl, ndev->nd_parms);
8603e33d
RL		 416 dev_put(dev);
417 kfree(ndev);
a317a2f1 418 return ERR_PTR(err);
322f74a4 419 }
1da177e4 420
322f74a4 421 if (snmp6_register_dev(ndev) < 0) {
ba3542e1 422 ADBG(KERN_WARNING
f3213831 423 "%s: cannot create /proc/net/dev_snmp6/%s\n",
ba3542e1 424 __func__, dev->name);
a317a2f1 425 goto err_release;
322f74a4
IO		 426 }
427
9d6280da 428 /* One reference from device. */
1be92460 429 refcount_set(&ndev->refcnt, 1);
1da177e4 430
1b34be74
YH		 431 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
432 ndev->cnf.accept_dad = -1;
433
07a93626 434#if IS_ENABLED(CONFIG_IPV6_SIT)
b077d7ab 435 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
f3213831 436 pr_info("%s: Disabled Multicast RS\n", dev->name);
b077d7ab
YH		 437 ndev->cnf.rtr_solicits = 0;
438 }
439#endif
440
372e6c8f 441 INIT_LIST_HEAD(&ndev->tempaddr_list);
76506a98 442 ndev->desync_factor = U32_MAX;
322f74a4
IO		 443 if ((dev->flags&IFF_LOOPBACK) ||
444 dev->type == ARPHRD_TUNNEL ||
9625ed72 445 dev->type == ARPHRD_TUNNEL6 ||
0be669bb 446 dev->type == ARPHRD_SIT ||
0be669bb 447 dev->type == ARPHRD_NONE) {
322f74a4 448 ndev->cnf.use_tempaddr = -1;
9d6280da
JB		 449 } else
450 ipv6_regen_rndid(ndev);
5d9efa7e 451
914faa14 452 ndev->token = in6addr_any;
1da177e4 453
1f372c7b 454 if (netif_running(dev) && addrconf_link_ready(dev))
53aadcc9
HX		 455 ndev->if_flags |= IF_READY;
456
322f74a4
IO		 457 ipv6_mc_init_dev(ndev);
458 ndev->tstamp = jiffies;
a317a2f1
WC		 459 err = addrconf_sysctl_register(ndev);
460 if (err) {
461 ipv6_mc_destroy_dev(ndev);
2a189f9e 462 snmp6_unregister_dev(ndev);
a317a2f1
WC		 463 goto err_release;
464 }
30c4cf57 465 /* protected by rtnl_lock */
cf778b00 466 rcu_assign_pointer(dev->ip6_ptr, ndev);
d88ae4cc 467
2c5e8933
HFS		 468 /* Join interface-local all-node multicast group */
469 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allnodes);
470
d88ae4cc 471 /* Join all-node multicast group */
f3ee4010 472 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);
d88ae4cc 473
d6ddef9e 474 /* Join all-router multicast group if forwarding is set */
8b2aaede 475 if (ndev->cnf.forwarding && (dev->flags & IFF_MULTICAST))
d6ddef9e
LW		 476 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
477
1da177e4 478 return ndev;
a317a2f1
WC		 479
480err_release:
481 neigh_parms_release(&nd_tbl, ndev->nd_parms);
482 ndev->dead = 1;
483 in6_dev_finish_destroy(ndev);
484 return ERR_PTR(err);
1da177e4
LT		 485}
486
8e5e8f30 487static struct inet6_dev *ipv6_find_idev(struct net_device *dev)
1da177e4
LT		 488{
489 struct inet6_dev *idev;
490
491 ASSERT_RTNL();
492
e21e8467
SH		 493 idev = __in6_dev_get(dev);
494 if (!idev) {
495 idev = ipv6_add_dev(dev);
a317a2f1 496 if (IS_ERR(idev))
1da177e4
LT		 497 return NULL;
498 }
c5e33bdd 499
1da177e4
LT		 500 if (dev->flags&IFF_UP)
501 ipv6_mc_up(idev);
502 return idev;
503}
504
f3a1bfb1
ND		 505static int inet6_netconf_msgsize_devconf(int type)
506{
507 int size = NLMSG_ALIGN(sizeof(struct netconfmsg))
508 + nla_total_size(4); /* NETCONFA_IFINDEX */
136ba622 509 bool all = false;
f3a1bfb1 510
136ba622
ZS		 511 if (type == NETCONFA_ALL)
512 all = true;
513
514 if (all || type == NETCONFA_FORWARDING)
f3a1bfb1 515 size += nla_total_size(4);
b1afce95 516#ifdef CONFIG_IPV6_MROUTE
136ba622 517 if (all || type == NETCONFA_MC_FORWARDING)
d67b8c61 518 size += nla_total_size(4);
b1afce95 519#endif
136ba622 520 if (all || type == NETCONFA_PROXY_NEIGH)
c92d5491 521 size += nla_total_size(4);
f3a1bfb1 522
136ba622 523 if (all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN)
35103d11
AG		 524 size += nla_total_size(4);
525
f3a1bfb1
ND		 526 return size;
527}
528
529static int inet6_netconf_fill_devconf(struct sk_buff *skb, int ifindex,
530 struct ipv6_devconf *devconf, u32 portid,
531 u32 seq, int event, unsigned int flags,
532 int type)
533{
534 struct nlmsghdr *nlh;
535 struct netconfmsg *ncm;
136ba622 536 bool all = false;
f3a1bfb1
ND		 537
538 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg),
539 flags);
63159f29 540 if (!nlh)
f3a1bfb1
ND		 541 return -EMSGSIZE;
542
136ba622
ZS		 543 if (type == NETCONFA_ALL)
544 all = true;
545
f3a1bfb1
ND		 546 ncm = nlmsg_data(nlh);
547 ncm->ncm_family = AF_INET6;
548
549 if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0)
550 goto nla_put_failure;
551
23452170
DA		 552 if (!devconf)
553 goto out;
554
136ba622 555 if ((all || type == NETCONFA_FORWARDING) &&
f3a1bfb1
ND		 556 nla_put_s32(skb, NETCONFA_FORWARDING, devconf->forwarding) < 0)
557 goto nla_put_failure;
b1afce95 558#ifdef CONFIG_IPV6_MROUTE
136ba622 559 if ((all || type == NETCONFA_MC_FORWARDING) &&
d67b8c61
ND		 560 nla_put_s32(skb, NETCONFA_MC_FORWARDING,
561 devconf->mc_forwarding) < 0)
562 goto nla_put_failure;
b1afce95 563#endif
136ba622 564 if ((all || type == NETCONFA_PROXY_NEIGH) &&
c92d5491 565 nla_put_s32(skb, NETCONFA_PROXY_NEIGH, devconf->proxy_ndp) < 0)
566 goto nla_put_failure;
567
136ba622 568 if ((all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN) &&
35103d11
AG		 569 nla_put_s32(skb, NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
570 devconf->ignore_routes_with_linkdown) < 0)
571 goto nla_put_failure;
572
23452170 573out:
053c095a
JB		 574 nlmsg_end(skb, nlh);
575 return 0;
f3a1bfb1
ND		 576
577nla_put_failure:
578 nlmsg_cancel(skb, nlh);
579 return -EMSGSIZE;
580}
581
85b3daad
DA		 582void inet6_netconf_notify_devconf(struct net *net, int event, int type,
583 int ifindex, struct ipv6_devconf *devconf)
f3a1bfb1
ND		 584{
585 struct sk_buff *skb;
586 int err = -ENOBUFS;
587
927265bc 588 skb = nlmsg_new(inet6_netconf_msgsize_devconf(type), GFP_KERNEL);
63159f29 589 if (!skb)
f3a1bfb1
ND		 590 goto errout;
591
592 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 0, 0,
85b3daad 593 event, 0, type);
f3a1bfb1
ND		 594 if (err < 0) {
595 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
596 WARN_ON(err == -EMSGSIZE);
597 kfree_skb(skb);
598 goto errout;
599 }
927265bc 600 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_NETCONF, NULL, GFP_KERNEL);
f3a1bfb1
ND		 601 return;
602errout:
bd779028 603 rtnl_set_sk_err(net, RTNLGRP_IPV6_NETCONF, err);
f3a1bfb1
ND		 604}
605
76f8f6cb
ND		 606static const struct nla_policy devconf_ipv6_policy[NETCONFA_MAX+1] = {
607 [NETCONFA_IFINDEX] = { .len = sizeof(int) },
608 [NETCONFA_FORWARDING] = { .len = sizeof(int) },
c92d5491 609 [NETCONFA_PROXY_NEIGH] = { .len = sizeof(int) },
35103d11 610 [NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN] = { .len = sizeof(int) },
76f8f6cb
ND		 611};
612
613static int inet6_netconf_get_devconf(struct sk_buff *in_skb,
c21ef3e3
DA		 614 struct nlmsghdr *nlh,
615 struct netlink_ext_ack *extack)
76f8f6cb
ND		 616{
617 struct net *net = sock_net(in_skb->sk);
618 struct nlattr *tb[NETCONFA_MAX+1];
4ea2607f
FW		 619 struct inet6_dev *in6_dev = NULL;
620 struct net_device *dev = NULL;
76f8f6cb
ND		 621 struct netconfmsg *ncm;
622 struct sk_buff *skb;
623 struct ipv6_devconf *devconf;
76f8f6cb
ND		 624 int ifindex;
625 int err;
626
627 err = nlmsg_parse(nlh, sizeof(*ncm), tb, NETCONFA_MAX,
c21ef3e3 628 devconf_ipv6_policy, extack);
76f8f6cb 629 if (err < 0)
4ea2607f 630 return err;
76f8f6cb 631
76f8f6cb 632 if (!tb[NETCONFA_IFINDEX])
4ea2607f 633 return -EINVAL;
76f8f6cb 634
4ea2607f 635 err = -EINVAL;
76f8f6cb
ND		 636 ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]);
637 switch (ifindex) {
638 case NETCONFA_IFINDEX_ALL:
639 devconf = net->ipv6.devconf_all;
640 break;
641 case NETCONFA_IFINDEX_DEFAULT:
642 devconf = net->ipv6.devconf_dflt;
643 break;
644 default:
4ea2607f 645 dev = dev_get_by_index(net, ifindex);
63159f29 646 if (!dev)
4ea2607f
FW		 647 return -EINVAL;
648 in6_dev = in6_dev_get(dev);
63159f29 649 if (!in6_dev)
76f8f6cb
ND		 650 goto errout;
651 devconf = &in6_dev->cnf;
652 break;
653 }
654
655 err = -ENOBUFS;
4ea2607f 656 skb = nlmsg_new(inet6_netconf_msgsize_devconf(NETCONFA_ALL), GFP_KERNEL);
63159f29 657 if (!skb)
76f8f6cb
ND		 658 goto errout;
659
660 err = inet6_netconf_fill_devconf(skb, ifindex, devconf,
661 NETLINK_CB(in_skb).portid,
662 nlh->nlmsg_seq, RTM_NEWNETCONF, 0,
136ba622 663 NETCONFA_ALL);
76f8f6cb
ND		 664 if (err < 0) {
665 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
666 WARN_ON(err == -EMSGSIZE);
667 kfree_skb(skb);
668 goto errout;
669 }
670 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
671errout:
4ea2607f
FW		 672 if (in6_dev)
673 in6_dev_put(in6_dev);
674 if (dev)
675 dev_put(dev);
76f8f6cb
ND		 676 return err;
677}
678
7a674200
ND		 679static int inet6_netconf_dump_devconf(struct sk_buff *skb,
680 struct netlink_callback *cb)
681{
682 struct net *net = sock_net(skb->sk);
683 int h, s_h;
684 int idx, s_idx;
685 struct net_device *dev;
686 struct inet6_dev *idev;
687 struct hlist_head *head;
688
689 s_h = cb->args[0];
690 s_idx = idx = cb->args[1];
691
692 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
693 idx = 0;
694 head = &net->dev_index_head[h];
695 rcu_read_lock();
63998ac2
ND		 696 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^
697 net->dev_base_seq;
7a674200
ND		 698 hlist_for_each_entry_rcu(dev, head, index_hlist) {
699 if (idx < s_idx)
700 goto cont;
701 idev = __in6_dev_get(dev);
702 if (!idev)
703 goto cont;
704
705 if (inet6_netconf_fill_devconf(skb, dev->ifindex,
706 &idev->cnf,
707 NETLINK_CB(cb->skb).portid,
708 cb->nlh->nlmsg_seq,
709 RTM_NEWNETCONF,
710 NLM_F_MULTI,
136ba622 711 NETCONFA_ALL) < 0) {
7a674200
ND		 712 rcu_read_unlock();
713 goto done;
714 }
63998ac2 715 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
7a674200
ND		 716cont:
717 idx++;
718 }
719 rcu_read_unlock();
720 }
721 if (h == NETDEV_HASHENTRIES) {
722 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL,
723 net->ipv6.devconf_all,
724 NETLINK_CB(cb->skb).portid,
725 cb->nlh->nlmsg_seq,
726 RTM_NEWNETCONF, NLM_F_MULTI,
136ba622 727 NETCONFA_ALL) < 0)
7a674200
ND		 728 goto done;
729 else
730 h++;
731 }
732 if (h == NETDEV_HASHENTRIES + 1) {
733 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT,
734 net->ipv6.devconf_dflt,
735 NETLINK_CB(cb->skb).portid,
736 cb->nlh->nlmsg_seq,
737 RTM_NEWNETCONF, NLM_F_MULTI,
136ba622 738 NETCONFA_ALL) < 0)
7a674200
ND		 739 goto done;
740 else
741 h++;
742 }
743done:
744 cb->args[0] = h;
745 cb->args[1] = idx;
746
747 return skb->len;
748}
749
1da177e4
LT		 750#ifdef CONFIG_SYSCTL
751static void dev_forward_change(struct inet6_dev *idev)
752{
753 struct net_device *dev;
754 struct inet6_ifaddr *ifa;
1da177e4
LT		 755
756 if (!idev)
757 return;
758 dev = idev->dev;
0187bdfb
BH		 759 if (idev->cnf.forwarding)
760 dev_disable_lro(dev);
1a940835 761 if (dev->flags & IFF_MULTICAST) {
2c5e8933 762 if (idev->cnf.forwarding) {
f3ee4010 763 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
2c5e8933
HFS		 764 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allrouters);
765 ipv6_dev_mc_inc(dev, &in6addr_sitelocal_allrouters);
766 } else {
f3ee4010 767 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
2c5e8933
HFS		 768 ipv6_dev_mc_dec(dev, &in6addr_interfacelocal_allrouters);
769 ipv6_dev_mc_dec(dev, &in6addr_sitelocal_allrouters);
770 }
1da177e4 771 }
502a2ffd 772
773 list_for_each_entry(ifa, &idev->addr_list, if_list) {
2c12a74c
MW		 774 if (ifa->flags&IFA_F_TENTATIVE)
775 continue;
1da177e4
LT		 776 if (idev->cnf.forwarding)
777 addrconf_join_anycast(ifa);
778 else
779 addrconf_leave_anycast(ifa);
780 }
85b3daad
DA		 781 inet6_netconf_notify_devconf(dev_net(dev), RTM_NEWNETCONF,
782 NETCONFA_FORWARDING,
f3a1bfb1 783 dev->ifindex, &idev->cnf);
1da177e4
LT		 784}
785
786
e186932b 787static void addrconf_forward_change(struct net *net, __s32 newf)
1da177e4
LT		 788{
789 struct net_device *dev;
790 struct inet6_dev *idev;
791
4acd4945 792 for_each_netdev(net, dev) {
1da177e4
LT		 793 idev = __in6_dev_get(dev);
794 if (idev) {
e186932b
PE		 795 int changed = (!idev->cnf.forwarding) ^ (!newf);
796 idev->cnf.forwarding = newf;
1da177e4
LT		 797 if (changed)
798 dev_forward_change(idev);
799 }
1da177e4 800 }
1da177e4 801}
c8fecf22 802
013d97e9 803static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf)
c8fecf22 804{
bff16c2f 805 struct net *net;
013d97e9
FR		 806 int old;
807
808 if (!rtnl_trylock())
809 return restart_syscall();
bff16c2f
PE		 810
811 net = (struct net *)table->extra2;
013d97e9
FR		 812 old = *p;
813 *p = newf;
b325fddb 814
013d97e9 815 if (p == &net->ipv6.devconf_dflt->forwarding) {
f3a1bfb1 816 if ((!newf) ^ (!old))
85b3daad
DA		 817 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
818 NETCONFA_FORWARDING,
f3a1bfb1
ND		 819 NETCONFA_IFINDEX_DEFAULT,
820 net->ipv6.devconf_dflt);
013d97e9
FR		 821 rtnl_unlock();
822 return 0;
88af182e 823 }
c8fecf22 824
e186932b 825 if (p == &net->ipv6.devconf_all->forwarding) {
d26c638c
ND		 826 int old_dflt = net->ipv6.devconf_dflt->forwarding;
827
e186932b 828 net->ipv6.devconf_dflt->forwarding = newf;
d26c638c 829 if ((!newf) ^ (!old_dflt))
85b3daad
DA		 830 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
831 NETCONFA_FORWARDING,
d26c638c
ND		 832 NETCONFA_IFINDEX_DEFAULT,
833 net->ipv6.devconf_dflt);
834
e186932b 835 addrconf_forward_change(net, newf);
f3a1bfb1 836 if ((!newf) ^ (!old))
85b3daad
DA		 837 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
838 NETCONFA_FORWARDING,
f3a1bfb1
ND		 839 NETCONFA_IFINDEX_ALL,
840 net->ipv6.devconf_all);
013d97e9 841 } else if ((!newf) ^ (!old))
c8fecf22 842 dev_forward_change((struct inet6_dev *)table->extra1);
0187bdfb 843 rtnl_unlock();
c8fecf22 844
013d97e9 845 if (newf)
7b4da532 846 rt6_purge_dflt_routers(net);
b325fddb 847 return 1;
c8fecf22 848}
35103d11
AG		 849
850static void addrconf_linkdown_change(struct net *net, __s32 newf)
851{
852 struct net_device *dev;
853 struct inet6_dev *idev;
854
855 for_each_netdev(net, dev) {
856 idev = __in6_dev_get(dev);
857 if (idev) {
858 int changed = (!idev->cnf.ignore_routes_with_linkdown) ^ (!newf);
859
860 idev->cnf.ignore_routes_with_linkdown = newf;
861 if (changed)
862 inet6_netconf_notify_devconf(dev_net(dev),
85b3daad 863 RTM_NEWNETCONF,
35103d11
AG		 864 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
865 dev->ifindex,
866 &idev->cnf);
867 }
868 }
869}
870
871static int addrconf_fixup_linkdown(struct ctl_table *table, int *p, int newf)
872{
873 struct net *net;
874 int old;
875
876 if (!rtnl_trylock())
877 return restart_syscall();
878
879 net = (struct net *)table->extra2;
880 old = *p;
881 *p = newf;
882
883 if (p == &net->ipv6.devconf_dflt->ignore_routes_with_linkdown) {
884 if ((!newf) ^ (!old))
885 inet6_netconf_notify_devconf(net,
85b3daad 886 RTM_NEWNETCONF,
35103d11
AG		 887 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
888 NETCONFA_IFINDEX_DEFAULT,
889 net->ipv6.devconf_dflt);
890 rtnl_unlock();
891 return 0;
892 }
893
894 if (p == &net->ipv6.devconf_all->ignore_routes_with_linkdown) {
895 net->ipv6.devconf_dflt->ignore_routes_with_linkdown = newf;
896 addrconf_linkdown_change(net, newf);
897 if ((!newf) ^ (!old))
898 inet6_netconf_notify_devconf(net,
85b3daad 899 RTM_NEWNETCONF,
35103d11
AG		 900 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
901 NETCONFA_IFINDEX_ALL,
902 net->ipv6.devconf_all);
903 }
904 rtnl_unlock();
905
906 return 1;
907}
908
1da177e4
LT		 909#endif
910
5c578aed 911/* Nobody refers to this ifaddr, destroy it */
1da177e4
LT		 912void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
913{
c2e21293 914 WARN_ON(!hlist_unhashed(&ifp->addr_lst));
547b792c 915
1da177e4 916#ifdef NET_REFCNT_DEBUG
91df42be 917 pr_debug("%s\n", __func__);
1da177e4
LT		 918#endif
919
920 in6_dev_put(ifp->idev);
921
c15b1cca
HFS		 922 if (cancel_delayed_work(&ifp->dad_work))
923 pr_notice("delayed DAD work was pending while freeing ifa=%p\n",
924 ifp);
1da177e4 925
e9d3e084 926 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
f3213831 927 pr_warn("Freeing alive inet6 address %p\n", ifp);
1da177e4
LT		 928 return;
929 }
94e187c0 930 ip6_rt_put(ifp->rt);
1da177e4 931
e5785985 932 kfree_rcu(ifp, rcu);
1da177e4
LT		 933}
934
e55ffac6
BH		 935static void
936ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
937{
502a2ffd 938 struct list_head *p;
8a6ce0c0 939 int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
e55ffac6
BH		 940
941 /*
942 * Each device address list is sorted in order of scope -
943 * global before linklocal.
944 */
502a2ffd 945 list_for_each(p, &idev->addr_list) {
946 struct inet6_ifaddr *ifa
947 = list_entry(p, struct inet6_ifaddr, if_list);
8a6ce0c0 948 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
e55ffac6
BH		 949 break;
950 }
951
8ef802aa 952 list_add_tail_rcu(&ifp->if_list, p);
e55ffac6
BH		 953}
954
ddbe5032 955static u32 inet6_addr_hash(const struct in6_addr *addr)
3eb84f49 956{
ddbe5032 957 return hash_32(ipv6_addr_hash(addr), IN6_ADDR_HSIZE_SHIFT);
3eb84f49
YH		 958}
959
1da177e4
LT		 960/* On success it returns ifp with increased reference count */
961
962static struct inet6_ifaddr *
3f8f5298
JP		 963ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
964 const struct in6_addr *peer_addr, int pfxlen,
8a226b2c 965 int scope, u32 flags, u32 valid_lft, u32 prefered_lft)
1da177e4 966{
df789fe7 967 struct net *net = dev_net(idev->dev);
1da177e4
LT		 968 struct inet6_ifaddr *ifa = NULL;
969 struct rt6_info *rt;
3ad7d246 970 struct in6_validator_info i6vi;
3a88a81d 971 unsigned int hash;
1da177e4 972 int err = 0;
d68b8270
YH		 973 int addr_type = ipv6_addr_type(addr);
974
975 if (addr_type == IPV6_ADDR_ANY ||
976 addr_type & IPV6_ADDR_MULTICAST ||
977 (!(idev->dev->flags & IFF_LOOPBACK) &&
978 addr_type & IPV6_ADDR_LOOPBACK))
979 return ERR_PTR(-EADDRNOTAVAIL);
1da177e4 980
8814c4b5 981 rcu_read_lock_bh();
3ad7d246
KJ		 982
983 in6_dev_hold(idev);
984
1da177e4
LT		 985 if (idev->dead) {
986 err = -ENODEV; /*XXX*/
987 goto out2;
988 }
989
56d417b1 990 if (idev->cnf.disable_ipv6) {
9bdd8d40
BH		 991 err = -EACCES;
992 goto out2;
993 }
994
3ad7d246
KJ		 995 i6vi.i6vi_addr = *addr;
996 i6vi.i6vi_dev = idev;
997 rcu_read_unlock_bh();
998
999 err = inet6addr_validator_notifier_call_chain(NETDEV_UP, &i6vi);
1000
1001 rcu_read_lock_bh();
1002 err = notifier_to_errno(err);
1003 if (err)
1004 goto out2;
1005
5c578aed 1006 spin_lock(&addrconf_hash_lock);
1da177e4
LT		 1007
1008 /* Ignore adding duplicate addresses on an interface */
c346dca1 1009 if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) {
ba3542e1 1010 ADBG("ipv6_add_addr: already assigned\n");
1da177e4
LT		 1011 err = -EEXIST;
1012 goto out;
1013 }
1014
322f74a4 1015 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
1da177e4 1016
63159f29 1017 if (!ifa) {
ba3542e1 1018 ADBG("ipv6_add_addr: malloc failed\n");
1da177e4
LT		 1019 err = -ENOBUFS;
1020 goto out;
1021 }
1022
8f031519 1023 rt = addrconf_dst_alloc(idev, addr, false);
1da177e4
LT		 1024 if (IS_ERR(rt)) {
1025 err = PTR_ERR(rt);
1026 goto out;
1027 }
1028
df789fe7
DF		 1029 if (net->ipv6.devconf_all->disable_policy ||
1030 idev->cnf.disable_policy)
1031 rt->dst.flags |= DST_NOPOLICY;
1032
bba24896
JP		 1033 neigh_parms_data_state_setall(idev->nd_parms);
1034
4e3fd7a0 1035 ifa->addr = *addr;
3f8f5298
JP		 1036 if (peer_addr)
1037 ifa->peer_addr = *peer_addr;
1da177e4
LT		 1038
1039 spin_lock_init(&ifa->lock);
c15b1cca 1040 INIT_DELAYED_WORK(&ifa->dad_work, addrconf_dad_work);
c2e21293 1041 INIT_HLIST_NODE(&ifa->addr_lst);
1da177e4
LT		 1042 ifa->scope = scope;
1043 ifa->prefix_len = pfxlen;
66eb9f86
MB		 1044 ifa->flags = flags;
1045 /* No need to add the TENTATIVE flag for addresses with NODAD */
1046 if (!(flags & IFA_F_NODAD))
1047 ifa->flags |= IFA_F_TENTATIVE;
8a226b2c
JB		 1048 ifa->valid_lft = valid_lft;
1049 ifa->prefered_lft = prefered_lft;
1da177e4 1050 ifa->cstamp = ifa->tstamp = jiffies;
617fe29d 1051 ifa->tokenized = false;
1da177e4 1052
57f5f544
KF		 1053 ifa->rt = rt;
1054
1da177e4 1055 ifa->idev = idev;
1da177e4 1056 /* For caller */
271201c0 1057 refcount_set(&ifa->refcnt, 1);
1da177e4
LT		 1058
1059 /* Add to big hash table */
ddbe5032 1060 hash = inet6_addr_hash(addr);
1da177e4 1061
5c578aed 1062 hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]);
5c578aed 1063 spin_unlock(&addrconf_hash_lock);
1da177e4
LT		 1064
1065 write_lock(&idev->lock);
1066 /* Add to inet6_dev unicast addr list. */
e55ffac6 1067 ipv6_link_dev_addr(idev, ifa);
1da177e4 1068
1da177e4 1069 if (ifa->flags&IFA_F_TEMPORARY) {
372e6c8f 1070 list_add(&ifa->tmp_list, &idev->tempaddr_list);
1da177e4
LT		 1071 in6_ifa_hold(ifa);
1072 }
1da177e4 1073
1da177e4
LT		 1074 in6_ifa_hold(ifa);
1075 write_unlock(&idev->lock);
1076out2:
8814c4b5 1077 rcu_read_unlock_bh();
1da177e4 1078
fd92833a 1079 if (likely(err == 0))
f88c91dd 1080 inet6addr_notifier_call_chain(NETDEV_UP, ifa);
1da177e4
LT		 1081 else {
1082 kfree(ifa);
3ad7d246 1083 in6_dev_put(idev);
1da177e4
LT		 1084 ifa = ERR_PTR(err);
1085 }
1086
1087 return ifa;
1088out:
5c578aed 1089 spin_unlock(&addrconf_hash_lock);
1da177e4
LT		 1090 goto out2;
1091}
1092
5b84efec
TH		 1093enum cleanup_prefix_rt_t {
1094 CLEANUP_PREFIX_RT_NOP, /* no cleanup action for prefix route */
1095 CLEANUP_PREFIX_RT_DEL, /* delete the prefix route */
1096 CLEANUP_PREFIX_RT_EXPIRE, /* update the lifetime of the prefix route */
1097};
1098
1099/*
1100 * Check, whether the prefix for ifp would still need a prefix route
1101 * after deleting ifp. The function returns one of the CLEANUP_PREFIX_RT_*
1102 * constants.
1103 *
1104 * 1) we don't purge prefix if address was not permanent.
1105 * prefix is managed by its own lifetime.
1106 * 2) we also don't purge, if the address was IFA_F_NOPREFIXROUTE.
1107 * 3) if there are no addresses, delete prefix.
1108 * 4) if there are still other permanent address(es),
1109 * corresponding prefix is still permanent.
1110 * 5) if there are still other addresses with IFA_F_NOPREFIXROUTE,
1111 * don't purge the prefix, assume user space is managing it.
1112 * 6) otherwise, update prefix lifetime to the
1113 * longest valid lifetime among the corresponding
1114 * addresses on the device.
1115 * Note: subsequent RA will update lifetime.
1116 **/
1117static enum cleanup_prefix_rt_t
1118check_cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long *expires)
1119{
1120 struct inet6_ifaddr *ifa;
1121 struct inet6_dev *idev = ifp->idev;
1122 unsigned long lifetime;
1123 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_DEL;
1124
1125 *expires = jiffies;
1126
1127 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1128 if (ifa == ifp)
1129 continue;
1130 if (!ipv6_prefix_equal(&ifa->addr, &ifp->addr,
1131 ifp->prefix_len))
1132 continue;
1133 if (ifa->flags & (IFA_F_PERMANENT | IFA_F_NOPREFIXROUTE))
1134 return CLEANUP_PREFIX_RT_NOP;
1135
1136 action = CLEANUP_PREFIX_RT_EXPIRE;
1137
1138 spin_lock(&ifa->lock);
1139
1140 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
1141 /*
1142 * Note: Because this address is
1143 * not permanent, lifetime <
1144 * LONG_MAX / HZ here.
1145 */
1146 if (time_before(*expires, ifa->tstamp + lifetime * HZ))
1147 *expires = ifa->tstamp + lifetime * HZ;
1148 spin_unlock(&ifa->lock);
1149 }
1150
1151 return action;
1152}
1153
1154static void
1155cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long expires, bool del_rt)
1156{
1157 struct rt6_info *rt;
1158
1159 rt = addrconf_get_prefix_route(&ifp->addr,
1160 ifp->prefix_len,
1161 ifp->idev->dev,
1162 0, RTF_GATEWAY | RTF_DEFAULT);
1163 if (rt) {
1164 if (del_rt)
1165 ip6_del_rt(rt);
1166 else {
1167 if (!(rt->rt6i_flags & RTF_EXPIRES))
1168 rt6_set_expires(rt, expires);
1169 ip6_rt_put(rt);
1170 }
1171 }
1172}
1173
1174
1da177e4
LT		 1175/* This function wants to get referenced ifp and releases it before return */
1176
1177static void ipv6_del_addr(struct inet6_ifaddr *ifp)
1178{
4c5ff6a6 1179 int state;
5b84efec
TH		 1180 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_NOP;
1181 unsigned long expires;
1da177e4 1182
c15b1cca
HFS		 1183 ASSERT_RTNL();
1184
8e8e676d 1185 spin_lock_bh(&ifp->lock);
4c5ff6a6 1186 state = ifp->state;
e9d3e084 1187 ifp->state = INET6_IFADDR_STATE_DEAD;
8e8e676d 1188 spin_unlock_bh(&ifp->lock);
4c5ff6a6
HX		 1189
1190 if (state == INET6_IFADDR_STATE_DEAD)
1191 goto out;
1da177e4 1192
5c578aed 1193 spin_lock_bh(&addrconf_hash_lock);
1194 hlist_del_init_rcu(&ifp->addr_lst);
5c578aed 1195 spin_unlock_bh(&addrconf_hash_lock);
1da177e4 1196
5b84efec 1197 write_lock_bh(&ifp->idev->lock);
5d9efa7e 1198
1da177e4 1199 if (ifp->flags&IFA_F_TEMPORARY) {
372e6c8f 1200 list_del(&ifp->tmp_list);
1201 if (ifp->ifpub) {
1202 in6_ifa_put(ifp->ifpub);
1203 ifp->ifpub = NULL;
1da177e4 1204 }
372e6c8f 1205 __in6_ifa_put(ifp);
1da177e4 1206 }
1da177e4 1207
5b84efec
TH		 1208 if (ifp->flags & IFA_F_PERMANENT && !(ifp->flags & IFA_F_NOPREFIXROUTE))
1209 action = check_cleanup_prefix_route(ifp, &expires);
502a2ffd 1210
8ef802aa 1211 list_del_rcu(&ifp->if_list);
5b84efec
TH		 1212 __in6_ifa_put(ifp);
1213
1214 write_unlock_bh(&ifp->idev->lock);
1da177e4 1215
c15b1cca 1216 addrconf_del_dad_work(ifp);
b2238566 1217
1da177e4
LT		 1218 ipv6_ifa_notify(RTM_DELADDR, ifp);
1219
f88c91dd 1220 inet6addr_notifier_call_chain(NETDEV_DOWN, ifp);
1da177e4 1221
5b84efec
TH		 1222 if (action != CLEANUP_PREFIX_RT_NOP) {
1223 cleanup_prefix_route(ifp, expires,
1224 action == CLEANUP_PREFIX_RT_DEL);
1da177e4
LT		 1225 }
1226
c3968a85
DW		 1227 /* clean up prefsrc entries */
1228 rt6_remove_prefsrc(ifp);
4c5ff6a6 1229out:
1da177e4
LT		 1230 in6_ifa_put(ifp);
1231}
1232
1da177e4
LT		 1233static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
1234{
1235 struct inet6_dev *idev = ifp->idev;
1236 struct in6_addr addr, *tmpaddr;
76f793e3 1237 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_tstamp, age;
eac55bf9 1238 unsigned long regen_advance;
1da177e4
LT		 1239 int tmp_plen;
1240 int ret = 0;
95c385b4 1241 u32 addr_flags;
76f793e3 1242 unsigned long now = jiffies;
76506a98 1243 long max_desync_factor;
7aa8e63f 1244 s32 cnf_temp_preferred_lft;
1da177e4 1245
53bd6749 1246 write_lock_bh(&idev->lock);
1da177e4
LT		 1247 if (ift) {
1248 spin_lock_bh(&ift->lock);
1249 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
1250 spin_unlock_bh(&ift->lock);
1251 tmpaddr = &addr;
1252 } else {
1253 tmpaddr = NULL;
1254 }
1255retry:
1256 in6_dev_hold(idev);
1257 if (idev->cnf.use_tempaddr <= 0) {
53bd6749 1258 write_unlock_bh(&idev->lock);
f3213831 1259 pr_info("%s: use_tempaddr is disabled\n", __func__);
1da177e4
LT		 1260 in6_dev_put(idev);
1261 ret = -1;
1262 goto out;
1263 }
1264 spin_lock_bh(&ifp->lock);
1265 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
1266 idev->cnf.use_tempaddr = -1; /*XXX*/
1267 spin_unlock_bh(&ifp->lock);
53bd6749 1268 write_unlock_bh(&idev->lock);
f3213831
JP		 1269 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n",
1270 __func__);
1da177e4
LT		 1271 in6_dev_put(idev);
1272 ret = -1;
1273 goto out;
1274 }
1275 in6_ifa_hold(ifp);
1276 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
9d6280da 1277 ipv6_try_regen_rndid(idev, tmpaddr);
1da177e4 1278 memcpy(&addr.s6_addr[8], idev->rndid, 8);
76f793e3 1279 age = (now - ifp->tstamp) / HZ;
76506a98
JB		 1280
1281 regen_advance = idev->cnf.regen_max_retry *
1282 idev->cnf.dad_transmits *
1283 NEIGH_VAR(idev->nd_parms, RETRANS_TIME) / HZ;
1284
1285 /* recalculate max_desync_factor each time and update
1286 * idev->desync_factor if it's larger
1287 */
7aa8e63f 1288 cnf_temp_preferred_lft = READ_ONCE(idev->cnf.temp_prefered_lft);
76506a98
JB		 1289 max_desync_factor = min_t(__u32,
1290 idev->cnf.max_desync_factor,
7aa8e63f 1291 cnf_temp_preferred_lft - regen_advance);
76506a98
JB		 1292
1293 if (unlikely(idev->desync_factor > max_desync_factor)) {
1294 if (max_desync_factor > 0) {
1295 get_random_bytes(&idev->desync_factor,
1296 sizeof(idev->desync_factor));
1297 idev->desync_factor %= max_desync_factor;
1298 } else {
1299 idev->desync_factor = 0;
1300 }
1301 }
1302
1da177e4
LT		 1303 tmp_valid_lft = min_t(__u32,
1304 ifp->valid_lft,
7a876b0e 1305 idev->cnf.temp_valid_lft + age);
7aa8e63f 1306 tmp_prefered_lft = cnf_temp_preferred_lft + age -
76506a98 1307 idev->desync_factor;
76506a98 1308 tmp_prefered_lft = min_t(__u32, ifp->prefered_lft, tmp_prefered_lft);
1da177e4 1309 tmp_plen = ifp->prefix_len;
1da177e4
LT		 1310 tmp_tstamp = ifp->tstamp;
1311 spin_unlock_bh(&ifp->lock);
1312
53bd6749 1313 write_unlock_bh(&idev->lock);
95c385b4 1314
eac55bf9
BB		 1315 /* A temporary address is created only if this calculated Preferred
1316 * Lifetime is greater than REGEN_ADVANCE time units. In particular,
1317 * an implementation must not create a temporary address with a zero
1318 * Preferred Lifetime.
ecab6701
HK		 1319 * Use age calculation as in addrconf_verify to avoid unnecessary
1320 * temporary addresses being generated.
eac55bf9 1321 */
ecab6701
HK		 1322 age = (now - tmp_tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
1323 if (tmp_prefered_lft <= regen_advance + age) {
eac55bf9
BB		 1324 in6_ifa_put(ifp);
1325 in6_dev_put(idev);
1326 ret = -1;
1327 goto out;
1328 }
1329
95c385b4
NH		 1330 addr_flags = IFA_F_TEMPORARY;
1331 /* set in addrconf_prefix_rcv() */
1332 if (ifp->flags & IFA_F_OPTIMISTIC)
1333 addr_flags |= IFA_F_OPTIMISTIC;
1334
4b08a8f1
HFS		 1335 ift = ipv6_add_addr(idev, &addr, NULL, tmp_plen,
1336 ipv6_addr_scope(&addr), addr_flags,
1337 tmp_valid_lft, tmp_prefered_lft);
1338 if (IS_ERR(ift)) {
1da177e4
LT		 1339 in6_ifa_put(ifp);
1340 in6_dev_put(idev);
f3213831 1341 pr_info("%s: retry temporary address regeneration\n", __func__);
1da177e4 1342 tmpaddr = &addr;
53bd6749 1343 write_lock_bh(&idev->lock);
1da177e4
LT		 1344 goto retry;
1345 }
1346
1347 spin_lock_bh(&ift->lock);
1348 ift->ifpub = ifp;
76f793e3 1349 ift->cstamp = now;
1da177e4
LT		 1350 ift->tstamp = tmp_tstamp;
1351 spin_unlock_bh(&ift->lock);
1352
cf22f9a2 1353 addrconf_dad_start(ift);
1da177e4
LT		 1354 in6_ifa_put(ift);
1355 in6_dev_put(idev);
1356out:
1357 return ret;
1358}
1da177e4
LT		 1359
1360/*
072047e4 1361 * Choose an appropriate source address (RFC3484)
1da177e4 1362 */
a9b05723
YH		 1363enum {
1364 IPV6_SADDR_RULE_INIT = 0,
1365 IPV6_SADDR_RULE_LOCAL,
1366 IPV6_SADDR_RULE_SCOPE,
1367 IPV6_SADDR_RULE_PREFERRED,
1368#ifdef CONFIG_IPV6_MIP6
1369 IPV6_SADDR_RULE_HOA,
1370#endif
1371 IPV6_SADDR_RULE_OIF,
1372 IPV6_SADDR_RULE_LABEL,
a9b05723 1373 IPV6_SADDR_RULE_PRIVACY,
a9b05723
YH		 1374 IPV6_SADDR_RULE_ORCHID,
1375 IPV6_SADDR_RULE_PREFIX,
7fd2561e
EK		 1376#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1377 IPV6_SADDR_RULE_NOT_OPTIMISTIC,
1378#endif
a9b05723
YH		 1379 IPV6_SADDR_RULE_MAX
1380};
1381
072047e4 1382struct ipv6_saddr_score {
a9b05723
YH		 1383 int rule;
1384 int addr_type;
1385 struct inet6_ifaddr *ifa;
1386 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
1387 int scopedist;
1388 int matchlen;
072047e4
YH		 1389};
1390
a9b05723 1391struct ipv6_saddr_dst {
9acd9f3a 1392 const struct in6_addr *addr;
a9b05723
YH		 1393 int ifindex;
1394 int scope;
1395 int label;
7cbca67c 1396 unsigned int prefs;
a9b05723 1397};
072047e4 1398
b6f99a21 1399static inline int ipv6_saddr_preferred(int type)
1da177e4 1400{
45bb0060 1401 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
072047e4
YH		 1402 return 1;
1403 return 0;
1da177e4
LT		 1404}
1405
35e015e1
MC		 1406static bool ipv6_use_optimistic_addr(struct net *net,
1407 struct inet6_dev *idev)
7fd2561e
EK		 1408{
1409#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
35e015e1
MC		 1410 if (!idev)
1411 return false;
1412 if (!net->ipv6.devconf_all->optimistic_dad && !idev->cnf.optimistic_dad)
1413 return false;
1414 if (!net->ipv6.devconf_all->use_optimistic && !idev->cnf.use_optimistic)
1415 return false;
1416
1417 return true;
7fd2561e
EK		 1418#else
1419 return false;
1420#endif
1421}
1422
3de23255
BT		 1423static int ipv6_get_saddr_eval(struct net *net,
1424 struct ipv6_saddr_score *score,
a9b05723
YH		 1425 struct ipv6_saddr_dst *dst,
1426 int i)
1427{
1428 int ret;
1429
1430 if (i <= score->rule) {
1431 switch (i) {
1432 case IPV6_SADDR_RULE_SCOPE:
1433 ret = score->scopedist;
1434 break;
1435 case IPV6_SADDR_RULE_PREFIX:
1436 ret = score->matchlen;
1437 break;
1438 default:
1439 ret = !!test_bit(i, score->scorebits);
1440 }
1441 goto out;
1442 }
1443
1444 switch (i) {
1445 case IPV6_SADDR_RULE_INIT:
1446 /* Rule 0: remember if hiscore is not ready yet */
1447 ret = !!score->ifa;
1448 break;
1449 case IPV6_SADDR_RULE_LOCAL:
1450 /* Rule 1: Prefer same address */
1451 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1452 break;
1453 case IPV6_SADDR_RULE_SCOPE:
1454 /* Rule 2: Prefer appropriate scope
1455 *
1456 * ret
1457 * ^
1458 * -1 | d 15
1459 * ---+--+-+---> scope
1460 * |
1461 * | d is scope of the destination.
1462 * B-d | \
1463 * | \ <- smaller scope is better if
db9c7c39 1464 * B-15 | \ if scope is enough for destination.
a9b05723
YH		 1465 * | ret = B - scope (-1 <= scope >= d <= 15).
1466 * d-C-1 | /
1467 * |/ <- greater is better
1468 * -C / if scope is not enough for destination.
1469 * /| ret = scope - C (-1 <= d < scope <= 15).
1470 *
1471 * d - C - 1 < B -15 (for all -1 <= d <= 15).
1472 * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1473 * Assume B = 0 and we get C > 29.
1474 */
1475 ret = __ipv6_addr_src_scope(score->addr_type);
1476 if (ret >= dst->scope)
1477 ret = -ret;
1478 else
1479 ret -= 128; /* 30 is enough */
1480 score->scopedist = ret;
1481 break;
1482 case IPV6_SADDR_RULE_PREFERRED:
7fd2561e 1483 {
a9b05723 1484 /* Rule 3: Avoid deprecated and optimistic addresses */
7fd2561e
EK		 1485 u8 avoid = IFA_F_DEPRECATED;
1486
35e015e1 1487 if (!ipv6_use_optimistic_addr(net, score->ifa->idev))
7fd2561e 1488 avoid |= IFA_F_OPTIMISTIC;
a9b05723 1489 ret = ipv6_saddr_preferred(score->addr_type) ||
7fd2561e 1490 !(score->ifa->flags & avoid);
a9b05723 1491 break;
7fd2561e 1492 }
a9b05723
YH		 1493#ifdef CONFIG_IPV6_MIP6
1494 case IPV6_SADDR_RULE_HOA:
7cbca67c 1495 {
a9b05723 1496 /* Rule 4: Prefer home address */
7cbca67c
YH		 1497 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1498 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
a9b05723 1499 break;
7cbca67c 1500 }
a9b05723
YH		 1501#endif
1502 case IPV6_SADDR_RULE_OIF:
1503 /* Rule 5: Prefer outgoing interface */
1504 ret = (!dst->ifindex ||
1505 dst->ifindex == score->ifa->idev->dev->ifindex);
1506 break;
1507 case IPV6_SADDR_RULE_LABEL:
1508 /* Rule 6: Prefer matching label */
3de23255
BT		 1509 ret = ipv6_addr_label(net,
1510 &score->ifa->addr, score->addr_type,
a9b05723
YH		 1511 score->ifa->idev->dev->ifindex) == dst->label;
1512 break;
a9b05723 1513 case IPV6_SADDR_RULE_PRIVACY:
7cbca67c 1514 {
a9b05723 1515 /* Rule 7: Prefer public address
25985edc 1516 * Note: prefer temporary address if use_tempaddr >= 2
a9b05723 1517 */
7cbca67c
YH		 1518 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1519 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1520 score->ifa->idev->cnf.use_tempaddr >= 2;
1521 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
a9b05723 1522 break;
7cbca67c 1523 }
a9b05723
YH		 1524 case IPV6_SADDR_RULE_ORCHID:
1525 /* Rule 8-: Prefer ORCHID vs ORCHID or
1526 * non-ORCHID vs non-ORCHID
1527 */
1528 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1529 ipv6_addr_orchid(dst->addr));
1530 break;
1531 case IPV6_SADDR_RULE_PREFIX:
1532 /* Rule 8: Use longest matching prefix */
91b4b04f
YH		 1533 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr);
1534 if (ret > score->ifa->prefix_len)
1535 ret = score->ifa->prefix_len;
1536 score->matchlen = ret;
a9b05723 1537 break;
7fd2561e
EK		 1538#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1539 case IPV6_SADDR_RULE_NOT_OPTIMISTIC:
1540 /* Optimistic addresses still have lower precedence than other
1541 * preferred addresses.
1542 */
1543 ret = !(score->ifa->flags & IFA_F_OPTIMISTIC);
1544 break;
1545#endif
a9b05723
YH		 1546 default:
1547 ret = 0;
1548 }
1549
1550 if (ret)
1551 __set_bit(i, score->scorebits);
1552 score->rule = i;
1553out:
1554 return ret;
1555}
1556
c0b8da1e
YH		 1557static int __ipv6_dev_get_saddr(struct net *net,
1558 struct ipv6_saddr_dst *dst,
c0b8da1e
YH		 1559 struct inet6_dev *idev,
1560 struct ipv6_saddr_score *scores,
1561 int hiscore_idx)
9131f3de 1562{
c0b8da1e 1563 struct ipv6_saddr_score *score = &scores[1 - hiscore_idx], *hiscore = &scores[hiscore_idx];
9131f3de 1564
f59c031e 1565 list_for_each_entry_rcu(score->ifa, &idev->addr_list, if_list) {
9131f3de
YH		 1566 int i;
1567
1568 /*
1569 * - Tentative Address (RFC2462 section 5.4)
1570 * - A tentative address is not considered
1571 * "assigned to an interface" in the traditional
1572 * sense, unless it is also flagged as optimistic.
1573 * - Candidate Source Address (section 4)
1574 * - In any case, anycast addresses, multicast
1575 * addresses, and the unspecified address MUST
1576 * NOT be included in a candidate set.
1577 */
1578 if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1579 (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
1580 continue;
1581
1582 score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1583
1584 if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1585 score->addr_type & IPV6_ADDR_MULTICAST)) {
1586 net_dbg_ratelimited("ADDRCONF: unspecified / multicast address assigned as unicast address on %s",
1587 idev->dev->name);
1588 continue;
1589 }
1590
1591 score->rule = -1;
1592 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1593
1594 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1595 int minihiscore, miniscore;
1596
1597 minihiscore = ipv6_get_saddr_eval(net, hiscore, dst, i);
1598 miniscore = ipv6_get_saddr_eval(net, score, dst, i);
1599
1600 if (minihiscore > miniscore) {
1601 if (i == IPV6_SADDR_RULE_SCOPE &&
1602 score->scopedist > 0) {
1603 /*
1604 * special case:
1605 * each remaining entry
1606 * has too small (not enough)
1607 * scope, because ifa entries
1608 * are sorted by their scope
1609 * values.
1610 */
1611 goto out;
1612 }
1613 break;
1614 } else if (minihiscore < miniscore) {
9131f3de 1615 swap(hiscore, score);
c0b8da1e 1616 hiscore_idx = 1 - hiscore_idx;
9131f3de
YH		 1617
1618 /* restore our iterator */
1619 score->ifa = hiscore->ifa;
1620
1621 break;
1622 }
1623 }
1624 }
1625out:
c0b8da1e 1626 return hiscore_idx;
9131f3de
YH		 1627}
1628
afbac601
DA		 1629static int ipv6_get_saddr_master(struct net *net,
1630 const struct net_device *dst_dev,
1631 const struct net_device *master,
1632 struct ipv6_saddr_dst *dst,
1633 struct ipv6_saddr_score *scores,
1634 int hiscore_idx)
1635{
1636 struct inet6_dev *idev;
1637
1638 idev = __in6_dev_get(dst_dev);
1639 if (idev)
1640 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev,
1641 scores, hiscore_idx);
1642
1643 idev = __in6_dev_get(master);
1644 if (idev)
1645 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev,
1646 scores, hiscore_idx);
1647
1648 return hiscore_idx;
1649}
1650
b3f644fc 1651int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev,
9acd9f3a 1652 const struct in6_addr *daddr, unsigned int prefs,
7cbca67c 1653 struct in6_addr *saddr)
1da177e4 1654{
c0b8da1e 1655 struct ipv6_saddr_score scores[2], *hiscore;
a9b05723 1656 struct ipv6_saddr_dst dst;
9131f3de 1657 struct inet6_dev *idev;
072047e4 1658 struct net_device *dev;
a9b05723 1659 int dst_type;
9131f3de 1660 bool use_oif_addr = false;
c0b8da1e 1661 int hiscore_idx = 0;
cc429c8f 1662 int ret = 0;
1da177e4 1663
a9b05723
YH		 1664 dst_type = __ipv6_addr_type(daddr);
1665 dst.addr = daddr;
1666 dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1667 dst.scope = __ipv6_addr_src_scope(dst_type);
3de23255 1668 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
7cbca67c 1669 dst.prefs = prefs;
a9b05723 1670
c0b8da1e
YH		 1671 scores[hiscore_idx].rule = -1;
1672 scores[hiscore_idx].ifa = NULL;
1da177e4 1673
8814c4b5 1674 rcu_read_lock();
1da177e4 1675
9131f3de
YH		 1676 /* Candidate Source Address (section 4)
1677 * - multicast and link-local destination address,
1678 * the set of candidate source address MUST only
1679 * include addresses assigned to interfaces
1680 * belonging to the same link as the outgoing
1681 * interface.
1682 * (- For site-local destination addresses, the
1683 * set of candidate source addresses MUST only
1684 * include addresses assigned to interfaces
1685 * belonging to the same site as the outgoing
1686 * interface.)
3985e8a3
EK		 1687 * - "It is RECOMMENDED that the candidate source addresses
1688 * be the set of unicast addresses assigned to the
1689 * interface that will be used to send to the destination
1690 * (the 'outgoing' interface)." (RFC 6724)
9131f3de
YH		 1691 */
1692 if (dst_dev) {
3985e8a3 1693 idev = __in6_dev_get(dst_dev);
9131f3de 1694 if ((dst_type & IPV6_ADDR_MULTICAST) ||
3985e8a3
EK		 1695 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL ||
1696 (idev && idev->cnf.use_oif_addrs_only)) {
9131f3de
YH		 1697 use_oif_addr = true;
1698 }
1699 }
a9b05723 1700
9131f3de 1701 if (use_oif_addr) {
c0b8da1e 1702 if (idev)
c15df306 1703 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx);
9131f3de 1704 } else {
afbac601
DA		 1705 const struct net_device *master;
1706 int master_idx = 0;
1707
1708 /* if dst_dev exists and is enslaved to an L3 device, then
1709 * prefer addresses from dst_dev and then the master over
1710 * any other enslaved devices in the L3 domain.
1711 */
1712 master = l3mdev_master_dev_rcu(dst_dev);
1713 if (master) {
1714 master_idx = master->ifindex;
1715
1716 hiscore_idx = ipv6_get_saddr_master(net, dst_dev,
1717 master, &dst,
1718 scores, hiscore_idx);
1719
1720 if (scores[hiscore_idx].ifa)
1721 goto out;
1722 }
1723
9131f3de 1724 for_each_netdev_rcu(net, dev) {
afbac601
DA		 1725 /* only consider addresses on devices in the
1726 * same L3 domain
1727 */
1728 if (l3mdev_master_ifindex_rcu(dev) != master_idx)
1729 continue;
9131f3de
YH		 1730 idev = __in6_dev_get(dev);
1731 if (!idev)
072047e4 1732 continue;
c15df306 1733 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx);
1da177e4
LT		 1734 }
1735 }
afbac601
DA		 1736
1737out:
c0b8da1e 1738 hiscore = &scores[hiscore_idx];
a9b05723 1739 if (!hiscore->ifa)
cc429c8f
ED		 1740 ret = -EADDRNOTAVAIL;
1741 else
1742 *saddr = hiscore->ifa->addr;
1ab1457c 1743
cc429c8f
ED		 1744 rcu_read_unlock();
1745 return ret;
1da177e4 1746}
5e5f3f0f 1747EXPORT_SYMBOL(ipv6_dev_get_saddr);
1da177e4 1748
8965779d 1749int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr,
479840ff 1750 u32 banned_flags)
b7b1bfce
HFS		 1751{
1752 struct inet6_ifaddr *ifp;
1753 int err = -EADDRNOTAVAIL;
1754
602582ca
HFS		 1755 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
1756 if (ifp->scope > IFA_LINK)
1757 break;
b7b1bfce
HFS		 1758 if (ifp->scope == IFA_LINK &&
1759 !(ifp->flags & banned_flags)) {
1760 *addr = ifp->addr;
1761 err = 0;
1762 break;
1763 }
1764 }
1765 return err;
1766}
1767
95c385b4 1768int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
479840ff 1769 u32 banned_flags)
1da177e4
LT		 1770{
1771 struct inet6_dev *idev;
1772 int err = -EADDRNOTAVAIL;
1773
8814c4b5 1774 rcu_read_lock();
e21e8467
SH		 1775 idev = __in6_dev_get(dev);
1776 if (idev) {
1da177e4 1777 read_lock_bh(&idev->lock);
b7b1bfce 1778 err = __ipv6_get_lladdr(idev, addr, banned_flags);
1da177e4
LT		 1779 read_unlock_bh(&idev->lock);
1780 }
8814c4b5 1781 rcu_read_unlock();
1da177e4
LT		 1782 return err;
1783}
1784
d9bf82c2 1785static int ipv6_count_addresses(const struct inet6_dev *idev)
1da177e4 1786{
d9bf82c2 1787 const struct inet6_ifaddr *ifp;
1da177e4 1788 int cnt = 0;
1da177e4 1789
d9bf82c2
ED		 1790 rcu_read_lock();
1791 list_for_each_entry_rcu(ifp, &idev->addr_list, if_list)
1da177e4 1792 cnt++;
d9bf82c2 1793 rcu_read_unlock();
1da177e4
LT		 1794 return cnt;
1795}
1796
b71d1d42 1797int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
2a7851bf 1798 const struct net_device *dev, int strict)
c58da4c6
EK		 1799{
1800 return ipv6_chk_addr_and_flags(net, addr, dev, strict, IFA_F_TENTATIVE);
1801}
1802EXPORT_SYMBOL(ipv6_chk_addr);
1803
1804int ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr,
1805 const struct net_device *dev, int strict,
1806 u32 banned_flags)
1da177e4 1807{
eedf042a 1808 struct inet6_ifaddr *ifp;
ddbe5032 1809 unsigned int hash = inet6_addr_hash(addr);
c58da4c6 1810 u32 ifp_flags;
1da177e4 1811
5c578aed 1812 rcu_read_lock_bh();
b67bfe0d 1813 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
878628fb 1814 if (!net_eq(dev_net(ifp->idev->dev), net))
bfeade08 1815 continue;
c58da4c6
EK		 1816 /* Decouple optimistic from tentative for evaluation here.
1817 * Ban optimistic addresses explicitly, when required.
1818 */
1819 ifp_flags = (ifp->flags&IFA_F_OPTIMISTIC)
1820 ? (ifp->flags&~IFA_F_TENTATIVE)
1821 : ifp->flags;
1da177e4 1822 if (ipv6_addr_equal(&ifp->addr, addr) &&
c58da4c6 1823 !(ifp_flags&banned_flags) &&
63159f29 1824 (!dev || ifp->idev->dev == dev ||
eedf042a
SH		 1825 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) {
1826 rcu_read_unlock_bh();
1827 return 1;
1da177e4
LT		 1828 }
1829 }
5c578aed 1830
eedf042a
SH		 1831 rcu_read_unlock_bh();
1832 return 0;
1da177e4 1833}
c58da4c6 1834EXPORT_SYMBOL(ipv6_chk_addr_and_flags);
7159039a 1835
3e81c6da
DM		 1836static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1837 struct net_device *dev)
1da177e4 1838{
ddbe5032 1839 unsigned int hash = inet6_addr_hash(addr);
c2e21293 1840 struct inet6_ifaddr *ifp;
1da177e4 1841
b67bfe0d 1842 hlist_for_each_entry(ifp, &inet6_addr_lst[hash], addr_lst) {
878628fb 1843 if (!net_eq(dev_net(ifp->idev->dev), net))
06bfe655 1844 continue;
1da177e4 1845 if (ipv6_addr_equal(&ifp->addr, addr)) {
63159f29 1846 if (!dev || ifp->idev->dev == dev)
3e81c6da 1847 return true;
1da177e4
LT		 1848 }
1849 }
3e81c6da 1850 return false;
1da177e4
LT		 1851}
1852
7df37ff3
CB		 1853/* Compares an address/prefix_len with addresses on device @dev.
1854 * If one is found it returns true.
1855 */
1856bool ipv6_chk_custom_prefix(const struct in6_addr *addr,
1857 const unsigned int prefix_len, struct net_device *dev)
1858{
47e26941
ED		 1859 const struct inet6_ifaddr *ifa;
1860 const struct inet6_dev *idev;
7df37ff3
CB		 1861 bool ret = false;
1862
1863 rcu_read_lock();
1864 idev = __in6_dev_get(dev);
1865 if (idev) {
47e26941 1866 list_for_each_entry_rcu(ifa, &idev->addr_list, if_list) {
7df37ff3
CB		 1867 ret = ipv6_prefix_equal(addr, &ifa->addr, prefix_len);
1868 if (ret)
1869 break;
1870 }
7df37ff3
CB		 1871 }
1872 rcu_read_unlock();
1873
1874 return ret;
1875}
1876EXPORT_SYMBOL(ipv6_chk_custom_prefix);
1877
b71d1d42 1878int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev)
52eeeb84 1879{
24ba333b
ED		 1880 const struct inet6_ifaddr *ifa;
1881 const struct inet6_dev *idev;
52eeeb84
YH		 1882 int onlink;
1883
1884 onlink = 0;
1885 rcu_read_lock();
1886 idev = __in6_dev_get(dev);
1887 if (idev) {
24ba333b 1888 list_for_each_entry_rcu(ifa, &idev->addr_list, if_list) {
52eeeb84
YH		 1889 onlink = ipv6_prefix_equal(addr, &ifa->addr,
1890 ifa->prefix_len);
1891 if (onlink)
1892 break;
1893 }
52eeeb84
YH		 1894 }
1895 rcu_read_unlock();
1896 return onlink;
1897}
52eeeb84
YH		 1898EXPORT_SYMBOL(ipv6_chk_prefix);
1899
9acd9f3a 1900struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1cab3da6 1901 struct net_device *dev, int strict)
1da177e4 1902{
b79d1d54 1903 struct inet6_ifaddr *ifp, *result = NULL;
ddbe5032 1904 unsigned int hash = inet6_addr_hash(addr);
1da177e4 1905
5c578aed 1906 rcu_read_lock_bh();
b67bfe0d 1907 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
878628fb 1908 if (!net_eq(dev_net(ifp->idev->dev), net))
1cab3da6 1909 continue;
1da177e4 1910 if (ipv6_addr_equal(&ifp->addr, addr)) {
63159f29 1911 if (!dev || ifp->idev->dev == dev ||
1da177e4 1912 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
b79d1d54 1913 result = ifp;
1da177e4
LT		 1914 in6_ifa_hold(ifp);
1915 break;
1916 }
1917 }
1918 }
5c578aed 1919 rcu_read_unlock_bh();
1da177e4 1920
b79d1d54 1921 return result;
1da177e4
LT		 1922}
1923
1da177e4
LT		 1924/* Gets referenced address, destroys ifaddr */
1925
cc411d0b 1926static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
1da177e4 1927{
3d171f39
LR		 1928 if (dad_failed)
1929 ifp->flags |= IFA_F_DADFAILED;
1930
ec8add2a 1931 if (ifp->flags&IFA_F_TEMPORARY) {
1da177e4
LT		 1932 struct inet6_ifaddr *ifpub;
1933 spin_lock_bh(&ifp->lock);
1934 ifpub = ifp->ifpub;
1935 if (ifpub) {
1936 in6_ifa_hold(ifpub);
1937 spin_unlock_bh(&ifp->lock);
1938 ipv6_create_tempaddr(ifpub, ifp);
1939 in6_ifa_put(ifpub);
1940 } else {
1941 spin_unlock_bh(&ifp->lock);
1942 }
1943 ipv6_del_addr(ifp);
ec8add2a
SD		 1944 } else if (ifp->flags&IFA_F_PERMANENT || !dad_failed) {
1945 spin_lock_bh(&ifp->lock);
1946 addrconf_del_dad_work(ifp);
1947 ifp->flags |= IFA_F_TENTATIVE;
1948 spin_unlock_bh(&ifp->lock);
1949 if (dad_failed)
1950 ipv6_ifa_notify(0, ifp);
1951 in6_ifa_put(ifp);
c15b1cca 1952 } else {
1da177e4 1953 ipv6_del_addr(ifp);
c15b1cca 1954 }
1da177e4
LT		 1955}
1956
f2344a13
HX		 1957static int addrconf_dad_end(struct inet6_ifaddr *ifp)
1958{
1959 int err = -ENOENT;
1960
8e8e676d 1961 spin_lock_bh(&ifp->lock);
f2344a13
HX		 1962 if (ifp->state == INET6_IFADDR_STATE_DAD) {
1963 ifp->state = INET6_IFADDR_STATE_POSTDAD;
1964 err = 0;
1965 }
8e8e676d 1966 spin_unlock_bh(&ifp->lock);
f2344a13
HX		 1967
1968 return err;
1969}
1970
3c21edbd
YH		 1971void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1972{
1b34be74 1973 struct inet6_dev *idev = ifp->idev;
1855b7c3 1974 struct net *net = dev_net(ifp->idev->dev);
9bdd8d40 1975
853dc2e0
UB		 1976 if (addrconf_dad_end(ifp)) {
1977 in6_ifa_put(ifp);
f2344a13 1978 return;
853dc2e0 1979 }
f2344a13 1980
e87cc472
JP		 1981 net_info_ratelimited("%s: IPv6 duplicate address %pI6c detected!\n",
1982 ifp->idev->dev->name, &ifp->addr);
9bdd8d40 1983
5f40ef77
HFS		 1984 spin_lock_bh(&ifp->lock);
1985
1986 if (ifp->flags & IFA_F_STABLE_PRIVACY) {
1987 int scope = ifp->scope;
1988 u32 flags = ifp->flags;
1989 struct in6_addr new_addr;
1990 struct inet6_ifaddr *ifp2;
1991 u32 valid_lft, preferred_lft;
1992 int pfxlen = ifp->prefix_len;
5f40ef77
HFS		 1993 int retries = ifp->stable_privacy_retry + 1;
1994
1855b7c3 1995 if (retries > net->ipv6.sysctl.idgen_retries) {
5f40ef77
HFS		 1996 net_info_ratelimited("%s: privacy stable address generation failed because of DAD conflicts!\n",
1997 ifp->idev->dev->name);
1998 goto errdad;
1999 }
2000
2001 new_addr = ifp->addr;
2002 if (ipv6_generate_stable_address(&new_addr, retries,
2003 idev))
2004 goto errdad;
2005
2006 valid_lft = ifp->valid_lft;
2007 preferred_lft = ifp->prefered_lft;
2008
2009 spin_unlock_bh(&ifp->lock);
1b34be74 2010
5f40ef77
HFS		 2011 if (idev->cnf.max_addresses &&
2012 ipv6_count_addresses(idev) >=
2013 idev->cnf.max_addresses)
2014 goto lock_errdad;
2015
2016 net_info_ratelimited("%s: generating new stable privacy address because of DAD conflict\n",
2017 ifp->idev->dev->name);
2018
2019 ifp2 = ipv6_add_addr(idev, &new_addr, NULL, pfxlen,
2020 scope, flags, valid_lft,
2021 preferred_lft);
2022 if (IS_ERR(ifp2))
2023 goto lock_errdad;
2024
2025 spin_lock_bh(&ifp2->lock);
2026 ifp2->stable_privacy_retry = retries;
2027 ifp2->state = INET6_IFADDR_STATE_PREDAD;
2028 spin_unlock_bh(&ifp2->lock);
2029
1855b7c3 2030 addrconf_mod_dad_work(ifp2, net->ipv6.sysctl.idgen_delay);
5f40ef77
HFS		 2031 in6_ifa_put(ifp2);
2032lock_errdad:
2033 spin_lock_bh(&ifp->lock);
1b34be74
YH		 2034 }
2035
5f40ef77 2036errdad:
c15b1cca
HFS		 2037 /* transition from _POSTDAD to _ERRDAD */
2038 ifp->state = INET6_IFADDR_STATE_ERRDAD;
8e8e676d 2039 spin_unlock_bh(&ifp->lock);
c15b1cca
HFS		 2040
2041 addrconf_mod_dad_work(ifp, 0);
751eb6b6 2042 in6_ifa_put(ifp);
3c21edbd 2043}
1da177e4 2044
a9ed4a29
SD		 2045/* Join to solicited addr multicast group.
2046 * caller must hold RTNL */
b71d1d42 2047void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr)
1da177e4
LT		 2048{
2049 struct in6_addr maddr;
2050
2051 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
2052 return;
2053
2054 addrconf_addr_solict_mult(addr, &maddr);
2055 ipv6_dev_mc_inc(dev, &maddr);
2056}
2057
a9ed4a29 2058/* caller must hold RTNL */
b71d1d42 2059void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr)
1da177e4
LT		 2060{
2061 struct in6_addr maddr;
2062
2063 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
2064 return;
2065
2066 addrconf_addr_solict_mult(addr, &maddr);
2067 __ipv6_dev_mc_dec(idev, &maddr);
2068}
2069
a9ed4a29 2070/* caller must hold RTNL */
20380731 2071static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1da177e4
LT		 2072{
2073 struct in6_addr addr;
c15b1cca 2074
88ad3149 2075 if (ifp->prefix_len >= 127) /* RFC 6164 */
2bda8a0c 2076 return;
1da177e4
LT		 2077 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
2078 if (ipv6_addr_any(&addr))
2079 return;
013b4d90 2080 __ipv6_dev_ac_inc(ifp->idev, &addr);
1da177e4
LT		 2081}
2082
a9ed4a29 2083/* caller must hold RTNL */
20380731 2084static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1da177e4
LT		 2085{
2086 struct in6_addr addr;
c15b1cca 2087
88ad3149 2088 if (ifp->prefix_len >= 127) /* RFC 6164 */
32019e65 2089 return;
1da177e4
LT		 2090 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
2091 if (ipv6_addr_any(&addr))
2092 return;
2093 __ipv6_dev_ac_dec(ifp->idev, &addr);
2094}
2095
8a7a4b47 2096static int addrconf_ifid_6lowpan(u8 *eui, struct net_device *dev)
06a4c1c5 2097{
8a7a4b47
AA		 2098 switch (dev->addr_len) {
2099 case ETH_ALEN:
9dae2e03
LAD		 2100 memcpy(eui, dev->dev_addr, 3);
2101 eui[3] = 0xFF;
2102 eui[4] = 0xFE;
2103 memcpy(eui + 5, dev->dev_addr + 3, 3);
2104 break;
8a7a4b47
AA		 2105 case EUI64_ADDR_LEN:
2106 memcpy(eui, dev->dev_addr, EUI64_ADDR_LEN);
2107 eui[0] ^= 2;
2108 break;
2109 default:
06a4c1c5 2110 return -1;
8a7a4b47
AA		 2111 }
2112
06a4c1c5 2113 return 0;
2114}
2115
cb6bf355
YH		 2116static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev)
2117{
2118 union fwnet_hwaddr *ha;
2119
2120 if (dev->addr_len != FWNET_ALEN)
2121 return -1;
2122
2123 ha = (union fwnet_hwaddr *)dev->dev_addr;
2124
2125 memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id));
2126 eui[0] ^= 2;
2127 return 0;
2128}
2129
073a8e0e
YH		 2130static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
2131{
2132 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
2133 if (dev->addr_len != ARCNET_ALEN)
2134 return -1;
2135 memset(eui, 0, 7);
8e5e8f30 2136 eui[7] = *(u8 *)dev->dev_addr;
073a8e0e
YH		 2137 return 0;
2138}
2139
2140static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
2141{
2142 if (dev->addr_len != INFINIBAND_ALEN)
2143 return -1;
2144 memcpy(eui, dev->dev_addr + 12, 8);
2145 eui[0] |= 2;
2146 return 0;
2147}
2148
c61393ea 2149static int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
dfd982ba 2150{
9af28511
SH		 2151 if (addr == 0)
2152 return -1;
dfd982ba
YH		 2153 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
2154 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
2155 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
2156 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
2157 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
2158 ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
2159 eui[1] = 0;
2160 eui[2] = 0x5E;
2161 eui[3] = 0xFE;
2162 memcpy(eui + 4, &addr, 4);
2163 return 0;
2164}
dfd982ba
YH		 2165
2166static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
2167{
2168 if (dev->priv_flags & IFF_ISATAP)
2169 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
2170 return -1;
2171}
2172
aee80b54 2173static int addrconf_ifid_gre(u8 *eui, struct net_device *dev)
2174{
2175 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
2176}
2177
e837735e
ND		 2178static int addrconf_ifid_ip6tnl(u8 *eui, struct net_device *dev)
2179{
2180 memcpy(eui, dev->perm_addr, 3);
2181 memcpy(eui + 5, dev->perm_addr + 3, 3);
2182 eui[3] = 0xFF;
2183 eui[4] = 0xFE;
2184 eui[0] ^= 2;
2185 return 0;
2186}
2187
1da177e4
LT		 2188static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
2189{
2190 switch (dev->type) {
2191 case ARPHRD_ETHER:
2192 case ARPHRD_FDDI:
073a8e0e 2193 return addrconf_ifid_eui48(eui, dev);
1da177e4 2194 case ARPHRD_ARCNET:
073a8e0e 2195 return addrconf_ifid_arcnet(eui, dev);
1da177e4 2196 case ARPHRD_INFINIBAND:
073a8e0e 2197 return addrconf_ifid_infiniband(eui, dev);
c7dc89c0 2198 case ARPHRD_SIT:
dfd982ba 2199 return addrconf_ifid_sit(eui, dev);
aee80b54 2200 case ARPHRD_IPGRE:
45ce0fd1 2201 case ARPHRD_TUNNEL:
aee80b54 2202 return addrconf_ifid_gre(eui, dev);
e74bccb8 2203 case ARPHRD_6LOWPAN:
8a7a4b47 2204 return addrconf_ifid_6lowpan(eui, dev);
cb6bf355
YH		 2205 case ARPHRD_IEEE1394:
2206 return addrconf_ifid_ieee1394(eui, dev);
e837735e 2207 case ARPHRD_TUNNEL6:
45ce0fd1 2208 case ARPHRD_IP6GRE:
e837735e 2209 return addrconf_ifid_ip6tnl(eui, dev);
1da177e4
LT		 2210 }
2211 return -1;
2212}
2213
2214static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
2215{
2216 int err = -1;
2217 struct inet6_ifaddr *ifp;
2218
2219 read_lock_bh(&idev->lock);
602582ca
HFS		 2220 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
2221 if (ifp->scope > IFA_LINK)
2222 break;
1da177e4
LT		 2223 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
2224 memcpy(eui, ifp->addr.s6_addr+8, 8);
2225 err = 0;
2226 break;
2227 }
2228 }
2229 read_unlock_bh(&idev->lock);
2230 return err;
2231}
2232
1da177e4 2233/* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
9d6280da 2234static void ipv6_regen_rndid(struct inet6_dev *idev)
1da177e4 2235{
1da177e4 2236regen:
955189ef 2237 get_random_bytes(idev->rndid, sizeof(idev->rndid));
1da177e4 2238 idev->rndid[0] &= ~0x02;
1da177e4
LT		 2239
2240 /*
2241 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
2242 * check if generated address is not inappropriate
2243 *
2244 * - Reserved subnet anycast (RFC 2526)
2245 * 11111101 11....11 1xxxxxxx
c7dc89c0 2246 * - ISATAP (RFC4214) 6.1
1da177e4
LT		 2247 * 00-00-5E-FE-xx-xx-xx-xx
2248 * - value 0
2249 * - XXX: already assigned to an address on the device
2250 */
1ab1457c 2251 if (idev->rndid[0] == 0xfd &&
1da177e4
LT		 2252 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
2253 (idev->rndid[7]&0x80))
2254 goto regen;
2255 if ((idev->rndid[0]|idev->rndid[1]) == 0) {
2256 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
2257 goto regen;
2258 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
2259 goto regen;
2260 }
1da177e4
LT		 2261}
2262
9d6280da 2263static void ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr)
8e5e8f30 2264{
1da177e4 2265 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
9d6280da 2266 ipv6_regen_rndid(idev);
1da177e4 2267}
1da177e4
LT		 2268
2269/*
2270 * Add prefix route.
2271 */
2272
2273static void
2274addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
e431b8c0 2275 unsigned long expires, u32 flags)
1da177e4 2276{
86872cb5 2277 struct fib6_config cfg = {
ca254490 2278 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX,
86872cb5
TG		 2279 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2280 .fc_ifindex = dev->ifindex,
2281 .fc_expires = expires,
2282 .fc_dst_len = plen,
2283 .fc_flags = RTF_UP | flags,
c346dca1 2284 .fc_nlinfo.nl_net = dev_net(dev),
f410a1fb 2285 .fc_protocol = RTPROT_KERNEL,
86872cb5 2286 };
1da177e4 2287
4e3fd7a0 2288 cfg.fc_dst = *pfx;
1da177e4
LT		 2289
2290 /* Prevent useless cloning on PtP SIT.
2291 This thing is done here expecting that the whole
2292 class of non-broadcast devices need not cloning.
2293 */
07a93626 2294#if IS_ENABLED(CONFIG_IPV6_SIT)
86872cb5
TG		 2295 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
2296 cfg.fc_flags |= RTF_NONEXTHOP;
0be669bb 2297#endif
1da177e4 2298
333c4301 2299 ip6_route_add(&cfg, NULL);
1da177e4
LT		 2300}
2301
14ef37b6
AH		 2302
2303static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
2304 int plen,
2305 const struct net_device *dev,
2306 u32 flags, u32 noflags)
2307{
2308 struct fib6_node *fn;
2309 struct rt6_info *rt = NULL;
2310 struct fib6_table *table;
ca254490 2311 u32 tb_id = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX;
14ef37b6 2312
ca254490 2313 table = fib6_get_table(dev_net(dev), tb_id);
63159f29 2314 if (!table)
14ef37b6
AH		 2315 return NULL;
2316
66f5d6ce 2317 rcu_read_lock();
38fbeeee 2318 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0, true);
14ef37b6
AH		 2319 if (!fn)
2320 goto out;
1f56a01f 2321
66f5d6ce 2322 for_each_fib6_node_rt_rcu(fn) {
d1918542 2323 if (rt->dst.dev->ifindex != dev->ifindex)
14ef37b6
AH		 2324 continue;
2325 if ((rt->rt6i_flags & flags) != flags)
2326 continue;
85da53bf 2327 if ((rt->rt6i_flags & noflags) != 0)
14ef37b6 2328 continue;
d3843fe5
WW		 2329 if (!dst_hold_safe(&rt->dst))
2330 rt = NULL;
14ef37b6
AH		 2331 break;
2332 }
2333out:
66f5d6ce 2334 rcu_read_unlock();
14ef37b6
AH		 2335 return rt;
2336}
2337
2338
1da177e4
LT		 2339/* Create "default" multicast route to the interface */
2340
2341static void addrconf_add_mroute(struct net_device *dev)
2342{
86872cb5 2343 struct fib6_config cfg = {
ca254490 2344 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_LOCAL,
86872cb5
TG		 2345 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2346 .fc_ifindex = dev->ifindex,
2347 .fc_dst_len = 8,
2348 .fc_flags = RTF_UP,
c346dca1 2349 .fc_nlinfo.nl_net = dev_net(dev),
86872cb5
TG		 2350 };
2351
2352 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
2353
333c4301 2354 ip6_route_add(&cfg, NULL);
1da177e4
LT		 2355}
2356
1da177e4
LT		 2357static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
2358{
2359 struct inet6_dev *idev;
2360
2361 ASSERT_RTNL();
2362
e21e8467
SH		 2363 idev = ipv6_find_idev(dev);
2364 if (!idev)
64e724f6
BH		 2365 return ERR_PTR(-ENOBUFS);
2366
2367 if (idev->cnf.disable_ipv6)
2368 return ERR_PTR(-EACCES);
1da177e4
LT		 2369
2370 /* Add default multicast route */
ba46ee4c 2371 if (!(dev->flags & IFF_LOOPBACK) && !netif_is_l3_master(dev))
4af04aba 2372 addrconf_add_mroute(dev);
1da177e4 2373
1da177e4
LT		 2374 return idev;
2375}
2376
53bd6749
JP		 2377static void manage_tempaddrs(struct inet6_dev *idev,
2378 struct inet6_ifaddr *ifp,
2379 __u32 valid_lft, __u32 prefered_lft,
2380 bool create, unsigned long now)
2381{
2382 u32 flags;
2383 struct inet6_ifaddr *ift;
2384
2385 read_lock_bh(&idev->lock);
2386 /* update all temporary addresses in the list */
2387 list_for_each_entry(ift, &idev->tempaddr_list, tmp_list) {
2388 int age, max_valid, max_prefered;
2389
2390 if (ifp != ift->ifpub)
2391 continue;
2392
2393 /* RFC 4941 section 3.3:
2394 * If a received option will extend the lifetime of a public
2395 * address, the lifetimes of temporary addresses should
2396 * be extended, subject to the overall constraint that no
2397 * temporary addresses should ever remain "valid" or "preferred"
2398 * for a time longer than (TEMP_VALID_LIFETIME) or
2399 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), respectively.
2400 */
2401 age = (now - ift->cstamp) / HZ;
2402 max_valid = idev->cnf.temp_valid_lft - age;
2403 if (max_valid < 0)
2404 max_valid = 0;
2405
2406 max_prefered = idev->cnf.temp_prefered_lft -
76506a98 2407 idev->desync_factor - age;
53bd6749
JP		 2408 if (max_prefered < 0)
2409 max_prefered = 0;
2410
2411 if (valid_lft > max_valid)
2412 valid_lft = max_valid;
2413
2414 if (prefered_lft > max_prefered)
2415 prefered_lft = max_prefered;
2416
2417 spin_lock(&ift->lock);
2418 flags = ift->flags;
2419 ift->valid_lft = valid_lft;
2420 ift->prefered_lft = prefered_lft;
2421 ift->tstamp = now;
2422 if (prefered_lft > 0)
2423 ift->flags &= ~IFA_F_DEPRECATED;
2424
2425 spin_unlock(&ift->lock);
2426 if (!(flags&IFA_F_TENTATIVE))
2427 ipv6_ifa_notify(0, ift);
2428 }
2429
2430 if ((create || list_empty(&idev->tempaddr_list)) &&
2431 idev->cnf.use_tempaddr > 0) {
2432 /* When a new public address is created as described
2433 * in [ADDRCONF], also create a new temporary address.
2434 * Also create a temporary address if it's enabled but
2435 * no temporary address currently exists.
2436 */
2437 read_unlock_bh(&idev->lock);
2438 ipv6_create_tempaddr(ifp, NULL);
2439 } else {
2440 read_unlock_bh(&idev->lock);
2441 }
2442}
2443
cc9da6cc
BM		 2444static bool is_addr_mode_generate_stable(struct inet6_dev *idev)
2445{
d35a00b8
FJ		 2446 return idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY ||
2447 idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_RANDOM;
cc9da6cc
BM		 2448}
2449
cc84b3c6
AA		 2450int addrconf_prefix_rcv_add_addr(struct net *net, struct net_device *dev,
2451 const struct prefix_info *pinfo,
2452 struct inet6_dev *in6_dev,
2453 const struct in6_addr *addr, int addr_type,
2454 u32 addr_flags, bool sllao, bool tokenized,
2455 __u32 valid_lft, u32 prefered_lft)
4f672235
AA		 2456{
2457 struct inet6_ifaddr *ifp = ipv6_get_ifaddr(net, addr, dev, 1);
2458 int create = 0, update_lft = 0;
2459
2460 if (!ifp && valid_lft) {
2461 int max_addresses = in6_dev->cnf.max_addresses;
2462
2463#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
35e015e1
MC		 2464 if ((net->ipv6.devconf_all->optimistic_dad ||
2465 in6_dev->cnf.optimistic_dad) &&
4f672235
AA		 2466 !net->ipv6.devconf_all->forwarding && sllao)
2467 addr_flags |= IFA_F_OPTIMISTIC;
2468#endif
2469
2470 /* Do not allow to create too much of autoconfigured
2471 * addresses; this would be too easy way to crash kernel.
2472 */
2473 if (!max_addresses ||
2474 ipv6_count_addresses(in6_dev) < max_addresses)
2475 ifp = ipv6_add_addr(in6_dev, addr, NULL,
2476 pinfo->prefix_len,
2477 addr_type&IPV6_ADDR_SCOPE_MASK,
2478 addr_flags, valid_lft,
2479 prefered_lft);
2480
2481 if (IS_ERR_OR_NULL(ifp))
2482 return -1;
2483
2484 update_lft = 0;
2485 create = 1;
2486 spin_lock_bh(&ifp->lock);
2487 ifp->flags |= IFA_F_MANAGETEMPADDR;
2488 ifp->cstamp = jiffies;
2489 ifp->tokenized = tokenized;
2490 spin_unlock_bh(&ifp->lock);
2491 addrconf_dad_start(ifp);
2492 }
2493
2494 if (ifp) {
2495 u32 flags;
2496 unsigned long now;
2497 u32 stored_lft;
2498
2499 /* update lifetime (RFC2462 5.5.3 e) */
2500 spin_lock_bh(&ifp->lock);
2501 now = jiffies;
2502 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
2503 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
2504 else
2505 stored_lft = 0;
2506 if (!update_lft && !create && stored_lft) {
2507 const u32 minimum_lft = min_t(u32,
2508 stored_lft, MIN_VALID_LIFETIME);
2509 valid_lft = max(valid_lft, minimum_lft);
2510
2511 /* RFC4862 Section 5.5.3e:
2512 * "Note that the preferred lifetime of the
2513 * corresponding address is always reset to
2514 * the Preferred Lifetime in the received
2515 * Prefix Information option, regardless of
2516 * whether the valid lifetime is also reset or
2517 * ignored."
2518 *
2519 * So we should always update prefered_lft here.
2520 */
2521 update_lft = 1;
2522 }
2523
2524 if (update_lft) {
2525 ifp->valid_lft = valid_lft;
2526 ifp->prefered_lft = prefered_lft;
2527 ifp->tstamp = now;
2528 flags = ifp->flags;
2529 ifp->flags &= ~IFA_F_DEPRECATED;
2530 spin_unlock_bh(&ifp->lock);
2531
2532 if (!(flags&IFA_F_TENTATIVE))
2533 ipv6_ifa_notify(0, ifp);
2534 } else
2535 spin_unlock_bh(&ifp->lock);
2536
2537 manage_tempaddrs(in6_dev, ifp, valid_lft, prefered_lft,
2538 create, now);
2539
2540 in6_ifa_put(ifp);
2541 addrconf_verify();
2542 }
2543
2544 return 0;
2545}
cc84b3c6 2546EXPORT_SYMBOL_GPL(addrconf_prefix_rcv_add_addr);
4f672235 2547
e6bff995 2548void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao)
1da177e4
LT		 2549{
2550 struct prefix_info *pinfo;
2551 __u32 valid_lft;
2552 __u32 prefered_lft;
4f672235 2553 int addr_type, err;
64236f3f 2554 u32 addr_flags = 0;
1da177e4 2555 struct inet6_dev *in6_dev;
56d417b1 2556 struct net *net = dev_net(dev);
1da177e4
LT		 2557
2558 pinfo = (struct prefix_info *) opt;
1ab1457c 2559
1da177e4 2560 if (len < sizeof(struct prefix_info)) {
ba3542e1 2561 ADBG("addrconf: prefix option too short\n");
1da177e4
LT		 2562 return;
2563 }
1ab1457c 2564
1da177e4
LT		 2565 /*
2566 * Validation checks ([ADDRCONF], page 19)
2567 */
2568
2569 addr_type = ipv6_addr_type(&pinfo->prefix);
2570
2571 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
2572 return;
2573
2574 valid_lft = ntohl(pinfo->valid);
2575 prefered_lft = ntohl(pinfo->prefered);
2576
2577 if (prefered_lft > valid_lft) {
e87cc472 2578 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n");
1da177e4
LT		 2579 return;
2580 }
2581
2582 in6_dev = in6_dev_get(dev);
2583
63159f29 2584 if (!in6_dev) {
e87cc472
JP		 2585 net_dbg_ratelimited("addrconf: device %s not configured\n",
2586 dev->name);
1da177e4
LT		 2587 return;
2588 }
2589
2590 /*
2591 * Two things going on here:
2592 * 1) Add routes for on-link prefixes
2593 * 2) Configure prefixes with the auto flag set
2594 */
2595
4bed72e4
YH		 2596 if (pinfo->onlink) {
2597 struct rt6_info *rt;
2598 unsigned long rt_expires;
2599
6f704992
YH		 2600 /* Avoid arithmetic overflow. Really, we could
2601 * save rt_expires in seconds, likely valid_lft,
2602 * but it would require division in fib gc, that it
2603 * not good.
2604 */
4bed72e4
YH		 2605 if (HZ > USER_HZ)
2606 rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
2607 else
2608 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
3dd4bc68 2609
4bed72e4
YH		 2610 if (addrconf_finite_timeout(rt_expires))
2611 rt_expires *= HZ;
1da177e4 2612
14ef37b6
AH		 2613 rt = addrconf_get_prefix_route(&pinfo->prefix,
2614 pinfo->prefix_len,
2615 dev,
2616 RTF_ADDRCONF | RTF_PREFIX_RT,
2617 RTF_GATEWAY | RTF_DEFAULT);
1da177e4 2618
14ef37b6 2619 if (rt) {
6f704992
YH		 2620 /* Autoconf prefix route */
2621 if (valid_lft == 0) {
2622 ip6_del_rt(rt);
2623 rt = NULL;
4bed72e4 2624 } else if (addrconf_finite_timeout(rt_expires)) {
6f704992 2625 /* not infinity */
1716a961 2626 rt6_set_expires(rt, jiffies + rt_expires);
6f704992 2627 } else {
1716a961 2628 rt6_clean_expires(rt);
1da177e4
LT		 2629 }
2630 } else if (valid_lft) {
6f704992 2631 clock_t expires = 0;
4bed72e4
YH		 2632 int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
2633 if (addrconf_finite_timeout(rt_expires)) {
6f704992
YH		 2634 /* not infinity */
2635 flags |= RTF_EXPIRES;
2636 expires = jiffies_to_clock_t(rt_expires);
2637 }
1da177e4 2638 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
6f704992 2639 dev, expires, flags);
1da177e4 2640 }
94e187c0 2641 ip6_rt_put(rt);
1da177e4
LT		 2642 }
2643
2644 /* Try to figure out our local address for this prefix */
2645
2646 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
1da177e4 2647 struct in6_addr addr;
f997c55c 2648 bool tokenized = false, dev_addr_generated = false;
1da177e4
LT		 2649
2650 if (pinfo->prefix_len == 64) {
2651 memcpy(&addr, &pinfo->prefix, 8);
f53adae4
DB		 2652
2653 if (!ipv6_addr_any(&in6_dev->token)) {
2654 read_lock_bh(&in6_dev->lock);
2655 memcpy(addr.s6_addr + 8,
2656 in6_dev->token.s6_addr + 8, 8);
2657 read_unlock_bh(&in6_dev->lock);
617fe29d 2658 tokenized = true;
cc9da6cc 2659 } else if (is_addr_mode_generate_stable(in6_dev) &&
622c81d5
HFS		 2660 !ipv6_generate_stable_address(&addr, 0,
2661 in6_dev)) {
64236f3f 2662 addr_flags |= IFA_F_STABLE_PRIVACY;
622c81d5 2663 goto ok;
f53adae4
DB		 2664 } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
2665 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
4f672235 2666 goto put;
f997c55c
AA		 2667 } else {
2668 dev_addr_generated = true;
1da177e4
LT		 2669 }
2670 goto ok;
2671 }
e87cc472
JP		 2672 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n",
2673 pinfo->prefix_len);
4f672235 2674 goto put;
1da177e4
LT		 2675
2676ok:
4f672235
AA		 2677 err = addrconf_prefix_rcv_add_addr(net, dev, pinfo, in6_dev,
2678 &addr, addr_type,
2679 addr_flags, sllao,
2680 tokenized, valid_lft,
2681 prefered_lft);
2682 if (err)
2683 goto put;
f997c55c
AA		 2684
2685 /* Ignore error case here because previous prefix add addr was
2686 * successful which will be notified.
2687 */
2688 ndisc_ops_prefix_rcv_add_addr(net, dev, pinfo, in6_dev, &addr,
2689 addr_type, addr_flags, sllao,
2690 tokenized, valid_lft,
2691 prefered_lft,
2692 dev_addr_generated);
1da177e4
LT		 2693 }
2694 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
4f672235 2695put:
1da177e4
LT		 2696 in6_dev_put(in6_dev);
2697}
2698
2699/*
2700 * Set destination address.
2701 * Special case for SIT interfaces where we create a new "virtual"
2702 * device.
2703 */
af284937 2704int addrconf_set_dstaddr(struct net *net, void __user *arg)
1da177e4
LT		 2705{
2706 struct in6_ifreq ireq;
2707 struct net_device *dev;
2708 int err = -EINVAL;
2709
2710 rtnl_lock();
2711
2712 err = -EFAULT;
2713 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2714 goto err_exit;
2715
af284937 2716 dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
1da177e4
LT		 2717
2718 err = -ENODEV;
63159f29 2719 if (!dev)
1da177e4
LT		 2720 goto err_exit;
2721
07a93626 2722#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4 2723 if (dev->type == ARPHRD_SIT) {
5bc3eb7e 2724 const struct net_device_ops *ops = dev->netdev_ops;
1da177e4 2725 struct ifreq ifr;
1da177e4
LT		 2726 struct ip_tunnel_parm p;
2727
2728 err = -EADDRNOTAVAIL;
2729 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2730 goto err_exit;
2731
2732 memset(&p, 0, sizeof(p));
2733 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2734 p.iph.saddr = 0;
2735 p.iph.version = 4;
2736 p.iph.ihl = 5;
2737 p.iph.protocol = IPPROTO_IPV6;
2738 p.iph.ttl = 64;
d20b3109 2739 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
1da177e4 2740
5bc3eb7e
SH		 2741 if (ops->ndo_do_ioctl) {
2742 mm_segment_t oldfs = get_fs();
2743
2744 set_fs(KERNEL_DS);
2745 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2746 set_fs(oldfs);
2747 } else
2748 err = -EOPNOTSUPP;
1da177e4
LT		 2749
2750 if (err == 0) {
2751 err = -ENOBUFS;
af284937
DL		 2752 dev = __dev_get_by_name(net, p.name);
2753 if (!dev)
1da177e4
LT		 2754 goto err_exit;
2755 err = dev_open(dev);
2756 }
2757 }
0be669bb 2758#endif
1da177e4
LT		 2759
2760err_exit:
2761 rtnl_unlock();
2762 return err;
2763}
2764
93a714d6
MC		 2765static int ipv6_mc_config(struct sock *sk, bool join,
2766 const struct in6_addr *addr, int ifindex)
2767{
2768 int ret;
2769
2770 ASSERT_RTNL();
2771
2772 lock_sock(sk);
2773 if (join)
54ff9ef3 2774 ret = ipv6_sock_mc_join(sk, ifindex, addr);
93a714d6 2775 else
54ff9ef3 2776 ret = ipv6_sock_mc_drop(sk, ifindex, addr);
93a714d6
MC		 2777 release_sock(sk);
2778
2779 return ret;
2780}
2781
1da177e4
LT		 2782/*
2783 * Manual configuration of address on an interface
2784 */
479840ff
JP		 2785static int inet6_addr_add(struct net *net, int ifindex,
2786 const struct in6_addr *pfx,
caeaba79 2787 const struct in6_addr *peer_pfx,
479840ff
JP		 2788 unsigned int plen, __u32 ifa_flags,
2789 __u32 prefered_lft, __u32 valid_lft)
1da177e4
LT		 2790{
2791 struct inet6_ifaddr *ifp;
2792 struct inet6_dev *idev;
2793 struct net_device *dev;
93a714d6
MC		 2794 unsigned long timeout;
2795 clock_t expires;
1da177e4 2796 int scope;
6f704992 2797 u32 flags;
1da177e4
LT		 2798
2799 ASSERT_RTNL();
1ab1457c 2800
24ef0da7
TG		 2801 if (plen > 128)
2802 return -EINVAL;
2803
0778769d
NT		 2804 /* check the lifetime */
2805 if (!valid_lft || prefered_lft > valid_lft)
2806 return -EINVAL;
2807
53bd6749
JP		 2808 if (ifa_flags & IFA_F_MANAGETEMPADDR && plen != 64)
2809 return -EINVAL;
2810
af284937
DL		 2811 dev = __dev_get_by_index(net, ifindex);
2812 if (!dev)
1da177e4 2813 return -ENODEV;
1ab1457c 2814
64e724f6
BH		 2815 idev = addrconf_add_dev(dev);
2816 if (IS_ERR(idev))
2817 return PTR_ERR(idev);
1da177e4 2818
93a714d6
MC		 2819 if (ifa_flags & IFA_F_MCAUTOJOIN) {
2820 int ret = ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2821 true, pfx, ifindex);
2822
2823 if (ret < 0)
2824 return ret;
2825 }
2826
1da177e4
LT		 2827 scope = ipv6_addr_scope(pfx);
2828
4bed72e4
YH		 2829 timeout = addrconf_timeout_fixup(valid_lft, HZ);
2830 if (addrconf_finite_timeout(timeout)) {
2831 expires = jiffies_to_clock_t(timeout * HZ);
2832 valid_lft = timeout;
6f704992 2833 flags = RTF_EXPIRES;
4bed72e4
YH		 2834 } else {
2835 expires = 0;
2836 flags = 0;
2837 ifa_flags |= IFA_F_PERMANENT;
6f704992 2838 }
0778769d 2839
4bed72e4
YH		 2840 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
2841 if (addrconf_finite_timeout(timeout)) {
2842 if (timeout == 0)
2843 ifa_flags |= IFA_F_DEPRECATED;
2844 prefered_lft = timeout;
2845 }
0778769d 2846
8a226b2c
JB		 2847 ifp = ipv6_add_addr(idev, pfx, peer_pfx, plen, scope, ifa_flags,
2848 valid_lft, prefered_lft);
0778769d 2849
1da177e4 2850 if (!IS_ERR(ifp)) {
761aac73
TH		 2851 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) {
2852 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
2853 expires, flags);
2854 }
2855
95c385b4
NH		 2856 /*
2857 * Note that section 3.1 of RFC 4429 indicates
2858 * that the Optimistic flag should not be set for
2859 * manually configured addresses
2860 */
cf22f9a2 2861 addrconf_dad_start(ifp);
53bd6749
JP		 2862 if (ifa_flags & IFA_F_MANAGETEMPADDR)
2863 manage_tempaddrs(idev, ifp, valid_lft, prefered_lft,
2864 true, jiffies);
1da177e4 2865 in6_ifa_put(ifp);
c15b1cca 2866 addrconf_verify_rtnl();
1da177e4 2867 return 0;
93a714d6
MC		 2868 } else if (ifa_flags & IFA_F_MCAUTOJOIN) {
2869 ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2870 false, pfx, ifindex);
1da177e4
LT		 2871 }
2872
2873 return PTR_ERR(ifp);
2874}
2875
6046d5b4
HK		 2876static int inet6_addr_del(struct net *net, int ifindex, u32 ifa_flags,
2877 const struct in6_addr *pfx, unsigned int plen)
1da177e4
LT		 2878{
2879 struct inet6_ifaddr *ifp;
2880 struct inet6_dev *idev;
2881 struct net_device *dev;
1ab1457c 2882
24ef0da7
TG		 2883 if (plen > 128)
2884 return -EINVAL;
2885
af284937
DL		 2886 dev = __dev_get_by_index(net, ifindex);
2887 if (!dev)
1da177e4
LT		 2888 return -ENODEV;
2889
e5d08d71 2890 idev = __in6_dev_get(dev);
63159f29 2891 if (!idev)
1da177e4
LT		 2892 return -ENXIO;
2893
2894 read_lock_bh(&idev->lock);
502a2ffd 2895 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1da177e4
LT		 2896 if (ifp->prefix_len == plen &&
2897 ipv6_addr_equal(pfx, &ifp->addr)) {
2898 in6_ifa_hold(ifp);
2899 read_unlock_bh(&idev->lock);
1ab1457c 2900
6046d5b4
HK		 2901 if (!(ifp->flags & IFA_F_TEMPORARY) &&
2902 (ifa_flags & IFA_F_MANAGETEMPADDR))
2903 manage_tempaddrs(idev, ifp, 0, 0, false,
2904 jiffies);
1da177e4 2905 ipv6_del_addr(ifp);
6046d5b4 2906 addrconf_verify_rtnl();
93a714d6
MC		 2907 if (ipv6_addr_is_multicast(pfx)) {
2908 ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2909 false, pfx, dev->ifindex);
2910 }
1da177e4
LT		 2911 return 0;
2912 }
2913 }
2914 read_unlock_bh(&idev->lock);
2915 return -EADDRNOTAVAIL;
2916}
2917
2918
af284937 2919int addrconf_add_ifaddr(struct net *net, void __user *arg)
1da177e4
LT		 2920{
2921 struct in6_ifreq ireq;
2922 int err;
1ab1457c 2923
af31f412 2924 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1da177e4 2925 return -EPERM;
1ab1457c 2926
1da177e4
LT		 2927 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2928 return -EFAULT;
2929
2930 rtnl_lock();
caeaba79 2931 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, NULL,
af284937
DL		 2932 ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2933 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
1da177e4
LT		 2934 rtnl_unlock();
2935 return err;
2936}
2937
af284937 2938int addrconf_del_ifaddr(struct net *net, void __user *arg)
1da177e4
LT		 2939{
2940 struct in6_ifreq ireq;
2941 int err;
1ab1457c 2942
af31f412 2943 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1da177e4
LT		 2944 return -EPERM;
2945
2946 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2947 return -EFAULT;
2948
2949 rtnl_lock();
6046d5b4 2950 err = inet6_addr_del(net, ireq.ifr6_ifindex, 0, &ireq.ifr6_addr,
af284937 2951 ireq.ifr6_prefixlen);
1da177e4
LT		 2952 rtnl_unlock();
2953 return err;
2954}
2955
b5f348e5
IJ		 2956static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
2957 int plen, int scope)
2958{
2959 struct inet6_ifaddr *ifp;
2960
8a226b2c 2961 ifp = ipv6_add_addr(idev, addr, NULL, plen,
07edd741
HFS		 2962 scope, IFA_F_PERMANENT,
2963 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
b5f348e5
IJ		 2964 if (!IS_ERR(ifp)) {
2965 spin_lock_bh(&ifp->lock);
2966 ifp->flags &= ~IFA_F_TENTATIVE;
2967 spin_unlock_bh(&ifp->lock);
764d3be6 2968 rt_genid_bump_ipv6(dev_net(idev->dev));
b5f348e5
IJ		 2969 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2970 in6_ifa_put(ifp);
2971 }
2972}
2973
07a93626 2974#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4
LT		 2975static void sit_add_v4_addrs(struct inet6_dev *idev)
2976{
1da177e4
LT		 2977 struct in6_addr addr;
2978 struct net_device *dev;
c346dca1 2979 struct net *net = dev_net(idev->dev);
929c9cf3 2980 int scope, plen;
f0e2acfa 2981 u32 pflags = 0;
1da177e4
LT		 2982
2983 ASSERT_RTNL();
2984
2985 memset(&addr, 0, sizeof(struct in6_addr));
2986 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2987
2988 if (idev->dev->flags&IFF_POINTOPOINT) {
2989 addr.s6_addr32[0] = htonl(0xfe800000);
2990 scope = IFA_LINK;
929c9cf3 2991 plen = 64;
1da177e4
LT		 2992 } else {
2993 scope = IPV6_ADDR_COMPATv4;
929c9cf3 2994 plen = 96;
f0e2acfa 2995 pflags |= RTF_NONEXTHOP;
1da177e4
LT		 2996 }
2997
2998 if (addr.s6_addr32[3]) {
929c9cf3 2999 add_addr(idev, &addr, plen, scope);
f0e2acfa 3000 addrconf_prefix_route(&addr, plen, idev->dev, 0, pflags);
1da177e4
LT		 3001 return;
3002 }
3003
6fda7350 3004 for_each_netdev(net, dev) {
8e5e8f30 3005 struct in_device *in_dev = __in_dev_get_rtnl(dev);
1da177e4 3006 if (in_dev && (dev->flags & IFF_UP)) {
8e5e8f30 3007 struct in_ifaddr *ifa;
1da177e4
LT		 3008
3009 int flag = scope;
3010
3011 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
1da177e4
LT		 3012
3013 addr.s6_addr32[3] = ifa->ifa_local;
3014
3015 if (ifa->ifa_scope == RT_SCOPE_LINK)
3016 continue;
3017 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
3018 if (idev->dev->flags&IFF_POINTOPOINT)
3019 continue;
3020 flag |= IFA_HOST;
3021 }
1da177e4 3022
b5f348e5 3023 add_addr(idev, &addr, plen, flag);
f0e2acfa
ND		 3024 addrconf_prefix_route(&addr, plen, idev->dev, 0,
3025 pflags);
1da177e4
LT		 3026 }
3027 }
1ab1457c 3028 }
1da177e4 3029}
0be669bb 3030#endif
1da177e4
LT		 3031
3032static void init_loopback(struct net_device *dev)
3033{
3034 struct inet6_dev *idev;
1da177e4
LT		 3035
3036 /* ::1 */
3037
3038 ASSERT_RTNL();
3039
e5d08d71 3040 idev = ipv6_find_idev(dev);
63159f29 3041 if (!idev) {
91df42be 3042 pr_debug("%s: add_dev failed\n", __func__);
1da177e4
LT		 3043 return;
3044 }
3045
b5f348e5 3046 add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
1da177e4
LT		 3047}
3048
2ad3ed59
AA		 3049void addrconf_add_linklocal(struct inet6_dev *idev,
3050 const struct in6_addr *addr, u32 flags)
1da177e4 3051{
8e5e8f30 3052 struct inet6_ifaddr *ifp;
64236f3f 3053 u32 addr_flags = flags | IFA_F_PERMANENT;
95c385b4
NH		 3054
3055#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
35e015e1
MC		 3056 if ((dev_net(idev->dev)->ipv6.devconf_all->optimistic_dad ||
3057 idev->cnf.optimistic_dad) &&
702beb87 3058 !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
95c385b4
NH		 3059 addr_flags |= IFA_F_OPTIMISTIC;
3060#endif
1da177e4 3061
07edd741
HFS		 3062 ifp = ipv6_add_addr(idev, addr, NULL, 64, IFA_LINK, addr_flags,
3063 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
1da177e4 3064 if (!IS_ERR(ifp)) {
46d48046 3065 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
cf22f9a2 3066 addrconf_dad_start(ifp);
1da177e4
LT		 3067 in6_ifa_put(ifp);
3068 }
3069}
2ad3ed59 3070EXPORT_SYMBOL_GPL(addrconf_add_linklocal);
1da177e4 3071
622c81d5
HFS		 3072static bool ipv6_reserved_interfaceid(struct in6_addr address)
3073{
3074 if ((address.s6_addr32[2] | address.s6_addr32[3]) == 0)
3075 return true;
3076
3077 if (address.s6_addr32[2] == htonl(0x02005eff) &&
3078 ((address.s6_addr32[3] & htonl(0xfe000000)) == htonl(0xfe000000)))
3079 return true;
3080
3081 if (address.s6_addr32[2] == htonl(0xfdffffff) &&
3082 ((address.s6_addr32[3] & htonl(0xffffff80)) == htonl(0xffffff80)))
3083 return true;
3084
3085 return false;
3086}
3087
3088static int ipv6_generate_stable_address(struct in6_addr *address,
3089 u8 dad_count,
3090 const struct inet6_dev *idev)
3091{
622c81d5
HFS		 3092 static DEFINE_SPINLOCK(lock);
3093 static __u32 digest[SHA_DIGEST_WORDS];
3094 static __u32 workspace[SHA_WORKSPACE_WORDS];
3095
3096 static union {
3097 char __data[SHA_MESSAGE_BYTES];
3098 struct {
3099 struct in6_addr secret;
ff40217e 3100 __be32 prefix[2];
622c81d5
HFS		 3101 unsigned char hwaddr[MAX_ADDR_LEN];
3102 u8 dad_count;
3103 } __packed;
3104 } data;
3105
3106 struct in6_addr secret;
3107 struct in6_addr temp;
3108 struct net *net = dev_net(idev->dev);
3109
3110 BUILD_BUG_ON(sizeof(data.__data) != sizeof(data));
3111
3112 if (idev->cnf.stable_secret.initialized)
3113 secret = idev->cnf.stable_secret.secret;
3114 else if (net->ipv6.devconf_dflt->stable_secret.initialized)
3115 secret = net->ipv6.devconf_dflt->stable_secret.secret;
3116 else
3117 return -1;
3118
3119retry:
3120 spin_lock_bh(&lock);
3121
3122 sha_init(digest);
3123 memset(&data, 0, sizeof(data));
3124 memset(workspace, 0, sizeof(workspace));
3125 memcpy(data.hwaddr, idev->dev->perm_addr, idev->dev->addr_len);
ff40217e
HFS		 3126 data.prefix[0] = address->s6_addr32[0];
3127 data.prefix[1] = address->s6_addr32[1];
622c81d5
HFS		 3128 data.secret = secret;
3129 data.dad_count = dad_count;
3130
3131 sha_transform(digest, data.__data, workspace);
3132
3133 temp = *address;
ff40217e
HFS		 3134 temp.s6_addr32[2] = (__force __be32)digest[0];
3135 temp.s6_addr32[3] = (__force __be32)digest[1];
622c81d5
HFS		 3136
3137 spin_unlock_bh(&lock);
3138
3139 if (ipv6_reserved_interfaceid(temp)) {
3140 dad_count++;
1855b7c3 3141 if (dad_count > dev_net(idev->dev)->ipv6.sysctl.idgen_retries)
622c81d5
HFS		 3142 return -1;
3143 goto retry;
3144 }
3145
3146 *address = temp;
3147 return 0;
3148}
3149
cc9da6cc
BM		 3150static void ipv6_gen_mode_random_init(struct inet6_dev *idev)
3151{
3152 struct ipv6_stable_secret *s = &idev->cnf.stable_secret;
3153
3154 if (s->initialized)
3155 return;
3156 s = &idev->cnf.stable_secret;
3157 get_random_bytes(&s->secret, sizeof(s->secret));
3158 s->initialized = true;
3159}
3160
bc91b0f0
JP		 3161static void addrconf_addr_gen(struct inet6_dev *idev, bool prefix_route)
3162{
622c81d5
HFS		 3163 struct in6_addr addr;
3164
ca254490
DA		 3165 /* no link local addresses on L3 master devices */
3166 if (netif_is_l3_master(idev->dev))
3167 return;
3168
622c81d5 3169 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
bc91b0f0 3170
d35a00b8 3171 switch (idev->cnf.addr_gen_mode) {
cc9da6cc
BM		 3172 case IN6_ADDR_GEN_MODE_RANDOM:
3173 ipv6_gen_mode_random_init(idev);
3174 /* fallthrough */
3175 case IN6_ADDR_GEN_MODE_STABLE_PRIVACY:
622c81d5 3176 if (!ipv6_generate_stable_address(&addr, 0, idev))
64236f3f
HFS		 3177 addrconf_add_linklocal(idev, &addr,
3178 IFA_F_STABLE_PRIVACY);
622c81d5
HFS		 3179 else if (prefix_route)
3180 addrconf_prefix_route(&addr, 64, idev->dev, 0, 0);
cc9da6cc
BM		 3181 break;
3182 case IN6_ADDR_GEN_MODE_EUI64:
bc91b0f0
JP		 3183 /* addrconf_add_linklocal also adds a prefix_route and we
3184 * only need to care about prefix routes if ipv6_generate_eui64
3185 * couldn't generate one.
3186 */
3187 if (ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) == 0)
64236f3f 3188 addrconf_add_linklocal(idev, &addr, 0);
bc91b0f0
JP		 3189 else if (prefix_route)
3190 addrconf_prefix_route(&addr, 64, idev->dev, 0, 0);
cc9da6cc
BM		 3191 break;
3192 case IN6_ADDR_GEN_MODE_NONE:
3193 default:
3194 /* will not add any link local address */
3195 break;
bc91b0f0
JP		 3196 }
3197}
3198
1da177e4
LT		 3199static void addrconf_dev_config(struct net_device *dev)
3200{
8e5e8f30 3201 struct inet6_dev *idev;
1da177e4
LT		 3202
3203 ASSERT_RTNL();
3204
74235a25
HX		 3205 if ((dev->type != ARPHRD_ETHER) &&
3206 (dev->type != ARPHRD_FDDI) &&
74235a25 3207 (dev->type != ARPHRD_ARCNET) &&
06a4c1c5 3208 (dev->type != ARPHRD_INFINIBAND) &&
e837735e 3209 (dev->type != ARPHRD_IEEE1394) &&
e74bccb8 3210 (dev->type != ARPHRD_TUNNEL6) &&
cc9da6cc 3211 (dev->type != ARPHRD_6LOWPAN) &&
45ce0fd1
FJ		 3212 (dev->type != ARPHRD_IP6GRE) &&
3213 (dev->type != ARPHRD_IPGRE) &&
3214 (dev->type != ARPHRD_TUNNEL) &&
cc9da6cc 3215 (dev->type != ARPHRD_NONE)) {
74235a25
HX		 3216 /* Alas, we support only Ethernet autoconfiguration. */
3217 return;
3218 }
3219
1da177e4 3220 idev = addrconf_add_dev(dev);
64e724f6 3221 if (IS_ERR(idev))
1da177e4
LT		 3222 return;
3223
cc9da6cc
BM		 3224 /* this device type has no EUI support */
3225 if (dev->type == ARPHRD_NONE &&
d35a00b8
FJ		 3226 idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_EUI64)
3227 idev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_RANDOM;
cc9da6cc 3228
bc91b0f0 3229 addrconf_addr_gen(idev, false);
1da177e4
LT		 3230}
3231
07a93626 3232#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4
LT		 3233static void addrconf_sit_config(struct net_device *dev)
3234{
3235 struct inet6_dev *idev;
3236
3237 ASSERT_RTNL();
3238
1ab1457c
YH		 3239 /*
3240 * Configure the tunnel with one of our IPv4
3241 * addresses... we should configure all of
1da177e4
LT		 3242 * our v4 addrs in the tunnel
3243 */
3244
e5d08d71 3245 idev = ipv6_find_idev(dev);
63159f29 3246 if (!idev) {
91df42be 3247 pr_debug("%s: add_dev failed\n", __func__);
1da177e4
LT		 3248 return;
3249 }
3250
c7dc89c0 3251 if (dev->priv_flags & IFF_ISATAP) {
bc91b0f0 3252 addrconf_addr_gen(idev, false);
c7dc89c0
FT		 3253 return;
3254 }
3255
1da177e4
LT		 3256 sit_add_v4_addrs(idev);
3257
62b54dd9 3258 if (dev->flags&IFF_POINTOPOINT)
1da177e4 3259 addrconf_add_mroute(dev);
1da177e4 3260}
0be669bb 3261#endif
1da177e4 3262
07a93626 3263#if IS_ENABLED(CONFIG_NET_IPGRE)
aee80b54 3264static void addrconf_gre_config(struct net_device *dev)
3265{
3266 struct inet6_dev *idev;
aee80b54 3267
aee80b54 3268 ASSERT_RTNL();
3269
e5d08d71 3270 idev = ipv6_find_idev(dev);
63159f29 3271 if (!idev) {
91df42be 3272 pr_debug("%s: add_dev failed\n", __func__);
aee80b54 3273 return;
3274 }
3275
bc91b0f0 3276 addrconf_addr_gen(idev, true);
d9e4ce65
HFS		 3277 if (dev->flags & IFF_POINTOPOINT)
3278 addrconf_add_mroute(dev);
aee80b54 3279}
3280#endif
3281
f1705ec1
DA		 3282static int fixup_permanent_addr(struct inet6_dev *idev,
3283 struct inet6_ifaddr *ifp)
3284{
fc882fcf 3285 /* !rt6i_node means the host route was removed from the
8048ced9
DA		 3286 * FIB, for example, if 'lo' device is taken down. In that
3287 * case regenerate the host route.
3288 */
fc882fcf 3289 if (!ifp->rt || !ifp->rt->rt6i_node) {
8048ced9 3290 struct rt6_info *rt, *prev;
f1705ec1
DA		 3291
3292 rt = addrconf_dst_alloc(idev, &ifp->addr, false);
63a4e80b 3293 if (IS_ERR(rt))
f1705ec1
DA		 3294 return PTR_ERR(rt);
3295
8048ced9
DA		 3296 /* ifp->rt can be accessed outside of rtnl */
3297 spin_lock(&ifp->lock);
3298 prev = ifp->rt;
f1705ec1 3299 ifp->rt = rt;
8048ced9
DA		 3300 spin_unlock(&ifp->lock);
3301
3302 ip6_rt_put(prev);
f1705ec1
DA		 3303 }
3304
3305 if (!(ifp->flags & IFA_F_NOPREFIXROUTE)) {
3306 addrconf_prefix_route(&ifp->addr, ifp->prefix_len,
3307 idev->dev, 0, 0);
3308 }
3309
6d717134
DA		 3310 if (ifp->state == INET6_IFADDR_STATE_PREDAD)
3311 addrconf_dad_start(ifp);
f1705ec1
DA		 3312
3313 return 0;
3314}
3315
3316static void addrconf_permanent_addr(struct net_device *dev)
3317{
3318 struct inet6_ifaddr *ifp, *tmp;
3319 struct inet6_dev *idev;
3320
3321 idev = __in6_dev_get(dev);
3322 if (!idev)
3323 return;
3324
3325 write_lock_bh(&idev->lock);
3326
3327 list_for_each_entry_safe(ifp, tmp, &idev->addr_list, if_list) {
3328 if ((ifp->flags & IFA_F_PERMANENT) &&
3329 fixup_permanent_addr(idev, ifp) < 0) {
3330 write_unlock_bh(&idev->lock);
3331 ipv6_del_addr(ifp);
3332 write_lock_bh(&idev->lock);
3333
3334 net_info_ratelimited("%s: Failed to add prefix route for address %pI6c; dropping\n",
3335 idev->dev->name, &ifp->addr);
3336 }
3337 }
3338
3339 write_unlock_bh(&idev->lock);
3340}
3341
1ab1457c 3342static int addrconf_notify(struct notifier_block *this, unsigned long event,
351638e7 3343 void *ptr)
1da177e4 3344{
351638e7 3345 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
4f7f34ea 3346 struct netdev_notifier_changeupper_info *info;
748e2d93 3347 struct inet6_dev *idev = __in6_dev_get(dev);
60abc0be 3348 struct net *net = dev_net(dev);
c5e33bdd 3349 int run_pending = 0;
b217d616 3350 int err;
1da177e4 3351
e21e8467 3352 switch (event) {
45ba9dd2 3353 case NETDEV_REGISTER:
74235a25 3354 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
45ba9dd2 3355 idev = ipv6_add_dev(dev);
a317a2f1
WC		 3356 if (IS_ERR(idev))
3357 return notifier_from_errno(PTR_ERR(idev));
45ba9dd2
YH		 3358 }
3359 break;
bcdd553f 3360
b7b0b1d2
AD		 3361 case NETDEV_CHANGEMTU:
3362 /* if MTU under IPV6_MIN_MTU stop IPv6 on this interface. */
3363 if (dev->mtu < IPV6_MIN_MTU) {
60abc0be 3364 addrconf_ifdown(dev, dev != net->loopback_dev);
b7b0b1d2
AD		 3365 break;
3366 }
3367
3368 if (idev) {
3369 rt6_mtu_change(dev, dev->mtu);
3370 idev->cnf.mtu6 = dev->mtu;
3371 break;
3372 }
3373
3374 /* allocate new idev */
3375 idev = ipv6_add_dev(dev);
3376 if (IS_ERR(idev))
3377 break;
3378
3379 /* device is still not ready */
3380 if (!(idev->if_flags & IF_READY))
3381 break;
3382
3383 run_pending = 1;
3384
3385 /* fall through */
3386
1da177e4 3387 case NETDEV_UP:
3c21edbd 3388 case NETDEV_CHANGE:
c2edacf8
JV		 3389 if (dev->flags & IFF_SLAVE)
3390 break;
3391
3ce62a84
WC		 3392 if (idev && idev->cnf.disable_ipv6)
3393 break;
3394
3c21edbd 3395 if (event == NETDEV_UP) {
38bd10c4
DA		 3396 /* restore routes for permanent addresses */
3397 addrconf_permanent_addr(dev);
3398
1f372c7b 3399 if (!addrconf_link_ready(dev)) {
3c21edbd 3400 /* device is not ready yet. */
f3213831 3401 pr_info("ADDRCONF(NETDEV_UP): %s: link is not ready\n",
3c21edbd
YH		 3402 dev->name);
3403 break;
3404 }
99081049 3405
d31c7b8f
EP		 3406 if (!idev && dev->mtu >= IPV6_MIN_MTU)
3407 idev = ipv6_add_dev(dev);
3408
a317a2f1 3409 if (!IS_ERR_OR_NULL(idev)) {
99081049 3410 idev->if_flags |= IF_READY;
e3ec6cfc
BT		 3411 run_pending = 1;
3412 }
b7b0b1d2 3413 } else if (event == NETDEV_CHANGE) {
1f372c7b 3414 if (!addrconf_link_ready(dev)) {
3c21edbd
YH		 3415 /* device is still not ready. */
3416 break;
3417 }
3418
3419 if (idev) {
a088d1d7
LL		 3420 if (idev->if_flags & IF_READY) {
3421 /* device is already configured -
3422 * but resend MLD reports, we might
3423 * have roamed and need to update
3424 * multicast snooping switches
3425 */
3426 ipv6_mc_up(idev);
3c21edbd 3427 break;
a088d1d7 3428 }
3c21edbd
YH		 3429 idev->if_flags |= IF_READY;
3430 }
3431
f3213831
JP		 3432 pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n",
3433 dev->name);
3c21edbd 3434
c5e33bdd 3435 run_pending = 1;
3c21edbd
YH		 3436 }
3437
e21e8467 3438 switch (dev->type) {
07a93626 3439#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4
LT		 3440 case ARPHRD_SIT:
3441 addrconf_sit_config(dev);
3442 break;
aee80b54 3443#endif
07a93626 3444#if IS_ENABLED(CONFIG_NET_IPGRE)
aee80b54 3445 case ARPHRD_IPGRE:
3446 addrconf_gre_config(dev);
3447 break;
0be669bb 3448#endif
1da177e4
LT		 3449 case ARPHRD_LOOPBACK:
3450 init_loopback(dev);
3451 break;
3452
3453 default:
3454 addrconf_dev_config(dev);
3455 break;
3ff50b79 3456 }
bcdd553f 3457
a317a2f1 3458 if (!IS_ERR_OR_NULL(idev)) {
c5e33bdd
YH		 3459 if (run_pending)
3460 addrconf_dad_run(idev);
3461
bcdd553f
SH		 3462 /*
3463 * If the MTU changed during the interface down,
3464 * when the interface up, the changed MTU must be
3465 * reflected in the idev as well as routers.
1da177e4 3466 */
bcdd553f
SH		 3467 if (idev->cnf.mtu6 != dev->mtu &&
3468 dev->mtu >= IPV6_MIN_MTU) {
1da177e4
LT		 3469 rt6_mtu_change(dev, dev->mtu);
3470 idev->cnf.mtu6 = dev->mtu;
3471 }
3472 idev->tstamp = jiffies;
3473 inet6_ifinfo_notify(RTM_NEWLINK, idev);
bcdd553f
SH		 3474
3475 /*
3476 * If the changed mtu during down is lower than
3477 * IPV6_MIN_MTU stop IPv6 on this interface.
1da177e4
LT		 3478 */
3479 if (dev->mtu < IPV6_MIN_MTU)
60abc0be 3480 addrconf_ifdown(dev, dev != net->loopback_dev);
1da177e4
LT		 3481 }
3482 break;
3483
1da177e4
LT		 3484 case NETDEV_DOWN:
3485 case NETDEV_UNREGISTER:
3486 /*
3487 * Remove all addresses from this interface.
3488 */
3489 addrconf_ifdown(dev, event != NETDEV_DOWN);
3490 break;
3c21edbd 3491
1da177e4 3492 case NETDEV_CHANGENAME:
1da177e4 3493 if (idev) {
5632c515 3494 snmp6_unregister_dev(idev);
408c4768 3495 addrconf_sysctl_unregister(idev);
a317a2f1 3496 err = addrconf_sysctl_register(idev);
b217d616
HX		 3497 if (err)
3498 return notifier_from_errno(err);
a317a2f1
WC		 3499 err = snmp6_register_dev(idev);
3500 if (err) {
3501 addrconf_sysctl_unregister(idev);
3502 return notifier_from_errno(err);
3503 }
5632c515 3504 }
1da177e4 3505 break;
bcdd553f 3506
93d9b7d7
JP		 3507 case NETDEV_PRE_TYPE_CHANGE:
3508 case NETDEV_POST_TYPE_CHANGE:
3ef0952c
AL		 3509 if (idev)
3510 addrconf_type_change(dev, event);
75c78500 3511 break;
4f7f34ea
DA		 3512
3513 case NETDEV_CHANGEUPPER:
3514 info = ptr;
3515
3516 /* flush all routes if dev is linked to or unlinked from
3517 * an L3 master device (e.g., VRF)
3518 */
3519 if (info->upper_dev && netif_is_l3_master(info->upper_dev))
3520 addrconf_ifdown(dev, 0);
3ff50b79 3521 }
1da177e4
LT		 3522
3523 return NOTIFY_OK;
3524}
3525
3526/*
3527 * addrconf module should be notified of a device going up
3528 */
3529static struct notifier_block ipv6_dev_notf = {
3530 .notifier_call = addrconf_notify,
242d3a49 3531 .priority = ADDRCONF_NOTIFY_PRIORITY,
1da177e4
LT		 3532};
3533
93d9b7d7 3534static void addrconf_type_change(struct net_device *dev, unsigned long event)
75c78500
MS		 3535{
3536 struct inet6_dev *idev;
3537 ASSERT_RTNL();
3538
3539 idev = __in6_dev_get(dev);
3540
93d9b7d7 3541 if (event == NETDEV_POST_TYPE_CHANGE)
75c78500 3542 ipv6_mc_remap(idev);
93d9b7d7 3543 else if (event == NETDEV_PRE_TYPE_CHANGE)
75c78500
MS		 3544 ipv6_mc_unmap(idev);
3545}
3546
70af921d
DA		 3547static bool addr_is_local(const struct in6_addr *addr)
3548{
3549 return ipv6_addr_type(addr) &
3550 (IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK);
3551}
3552
1da177e4
LT		 3553static int addrconf_ifdown(struct net_device *dev, int how)
3554{
c346dca1 3555 struct net *net = dev_net(dev);
502a2ffd 3556 struct inet6_dev *idev;
f1705ec1 3557 struct inet6_ifaddr *ifa, *tmp;
f1705ec1
DA		 3558 int _keep_addr;
3559 bool keep_addr;
73a8bd74 3560 int state, i;
1da177e4
LT		 3561
3562 ASSERT_RTNL();
3563
73a8bd74
DM		 3564 rt6_ifdown(net, dev);
3565 neigh_ifdown(&nd_tbl, dev);
1da177e4
LT		 3566
3567 idev = __in6_dev_get(dev);
63159f29 3568 if (!idev)
1da177e4
LT		 3569 return -ENODEV;
3570
bcdd553f
SH		 3571 /*
3572 * Step 1: remove reference to ipv6 device from parent device.
3573 * Do not dev_put!
1da177e4 3574 */
439e2385 3575 if (how) {
1da177e4 3576 idev->dead = 1;
8814c4b5
YH		 3577
3578 /* protected by rtnl_lock */
a9b3cd7f 3579 RCU_INIT_POINTER(dev->ip6_ptr, NULL);
1da177e4
LT		 3580
3581 /* Step 1.5: remove snmp6 entry */
3582 snmp6_unregister_dev(idev);
3583
3584 }
3585
f1705ec1
DA		 3586 /* aggregate the system setting and interface setting */
3587 _keep_addr = net->ipv6.devconf_all->keep_addr_on_down;
3588 if (!_keep_addr)
3589 _keep_addr = idev->cnf.keep_addr_on_down;
3590
3591 /* combine the user config with event to determine if permanent
3592 * addresses are to be removed from address hash table
3593 */
bc561632 3594 keep_addr = !(how || _keep_addr <= 0 || idev->cnf.disable_ipv6);
f1705ec1 3595
73a8bd74
DM		 3596 /* Step 2: clear hash table */
3597 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3598 struct hlist_head *h = &inet6_addr_lst[i];
73a8bd74
DM		 3599
3600 spin_lock_bh(&addrconf_hash_lock);
67ba4152 3601restart:
b67bfe0d 3602 hlist_for_each_entry_rcu(ifa, h, addr_lst) {
73a8bd74 3603 if (ifa->idev == idev) {
c15b1cca 3604 addrconf_del_dad_work(ifa);
f1705ec1
DA		 3605 /* combined flag + permanent flag decide if
3606 * address is retained on a down event
3607 */
3608 if (!keep_addr ||
70af921d
DA		 3609 !(ifa->flags & IFA_F_PERMANENT) ||
3610 addr_is_local(&ifa->addr)) {
f1705ec1
DA		 3611 hlist_del_init_rcu(&ifa->addr_lst);
3612 goto restart;
3613 }
73a8bd74
DM		 3614 }
3615 }
3616 spin_unlock_bh(&addrconf_hash_lock);
3617 }
3618
1da177e4
LT		 3619 write_lock_bh(&idev->lock);
3620
b7b1bfce
HFS		 3621 addrconf_del_rs_timer(idev);
3622
bcdd553f 3623 /* Step 2: clear flags for stateless addrconf */
439e2385 3624 if (!how)
3c21edbd 3625 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
1da177e4 3626
bcdd553f 3627 /* Step 3: clear tempaddr list */
372e6c8f 3628 while (!list_empty(&idev->tempaddr_list)) {
3629 ifa = list_first_entry(&idev->tempaddr_list,
3630 struct inet6_ifaddr, tmp_list);
3631 list_del(&ifa->tmp_list);
1da177e4
LT		 3632 write_unlock_bh(&idev->lock);
3633 spin_lock_bh(&ifa->lock);
3634
3635 if (ifa->ifpub) {
3636 in6_ifa_put(ifa->ifpub);
3637 ifa->ifpub = NULL;
3638 }
3639 spin_unlock_bh(&ifa->lock);
3640 in6_ifa_put(ifa);
3641 write_lock_bh(&idev->lock);
3642 }
8f37ada5 3643
f1705ec1
DA		 3644 /* re-combine the user config with event to determine if permanent
3645 * addresses are to be removed from the interface list
3646 */
bc561632 3647 keep_addr = (!how && _keep_addr > 0 && !idev->cnf.disable_ipv6);
84e8b803 3648
f1705ec1 3649 list_for_each_entry_safe(ifa, tmp, &idev->addr_list, if_list) {
38bd10c4 3650 struct rt6_info *rt = NULL;
a2d6cbb0 3651 bool keep;
38bd10c4 3652
f1705ec1 3653 addrconf_del_dad_work(ifa);
84e8b803 3654
a2d6cbb0
RV		 3655 keep = keep_addr && (ifa->flags & IFA_F_PERMANENT) &&
3656 !addr_is_local(&ifa->addr);
a2d6cbb0 3657
73a8bd74 3658 write_unlock_bh(&idev->lock);
8e8e676d 3659 spin_lock_bh(&ifa->lock);
f1705ec1 3660
a2d6cbb0 3661 if (keep) {
f1705ec1
DA		 3662 /* set state to skip the notifier below */
3663 state = INET6_IFADDR_STATE_DEAD;
6d717134 3664 ifa->state = INET6_IFADDR_STATE_PREDAD;
f1705ec1
DA		 3665 if (!(ifa->flags & IFA_F_NODAD))
3666 ifa->flags |= IFA_F_TENTATIVE;
38bd10c4
DA		 3667
3668 rt = ifa->rt;
3669 ifa->rt = NULL;
f1705ec1
DA		 3670 } else {
3671 state = ifa->state;
3672 ifa->state = INET6_IFADDR_STATE_DEAD;
f1705ec1
DA		 3673 }
3674
8e8e676d 3675 spin_unlock_bh(&ifa->lock);
9d82ca98 3676
38bd10c4
DA		 3677 if (rt)
3678 ip6_del_rt(rt);
3679
73a8bd74
DM		 3680 if (state != INET6_IFADDR_STATE_DEAD) {
3681 __ipv6_ifa_notify(RTM_DELADDR, ifa);
f88c91dd 3682 inet6addr_notifier_call_chain(NETDEV_DOWN, ifa);
ea06f717
MM		 3683 } else {
3684 if (idev->cnf.forwarding)
3685 addrconf_leave_anycast(ifa);
3686 addrconf_leave_solict(ifa->idev, &ifa->addr);
27bdb2ab 3687 }
8f37ada5 3688
73a8bd74 3689 write_lock_bh(&idev->lock);
8ef802aa
ED		 3690 if (!keep) {
3691 list_del_rcu(&ifa->if_list);
3692 in6_ifa_put(ifa);
3693 }
73a8bd74 3694 }
8f37ada5 3695
1da177e4
LT		 3696 write_unlock_bh(&idev->lock);
3697
381f4dca
SD		 3698 /* Step 5: Discard anycast and multicast list */
3699 if (how) {
3700 ipv6_ac_destroy_dev(idev);
1da177e4 3701 ipv6_mc_destroy_dev(idev);
381f4dca 3702 } else {
1da177e4 3703 ipv6_mc_down(idev);
381f4dca 3704 }
1da177e4 3705
1da177e4 3706 idev->tstamp = jiffies;
1ab1457c 3707
bcdd553f 3708 /* Last: Shot the device (if unregistered) */
439e2385 3709 if (how) {
408c4768 3710 addrconf_sysctl_unregister(idev);
1da177e4
LT		 3711 neigh_parms_release(&nd_tbl, idev->nd_parms);
3712 neigh_ifdown(&nd_tbl, dev);
3713 in6_dev_put(idev);
3714 }
3715 return 0;
3716}
3717
3718static void addrconf_rs_timer(unsigned long data)
3719{
b7b1bfce 3720 struct inet6_dev *idev = (struct inet6_dev *)data;
caf92bc4 3721 struct net_device *dev = idev->dev;
b7b1bfce 3722 struct in6_addr lladdr;
1da177e4 3723
b7b1bfce 3724 write_lock(&idev->lock);
5b2a1953 3725 if (idev->dead || !(idev->if_flags & IF_READY))
1da177e4
LT		 3726 goto out;
3727
9ba2add3 3728 if (!ipv6_accept_ra(idev))
5b2a1953 3729 goto out;
3730
3731 /* Announcement received after solicitation was sent */
3732 if (idev->if_flags & IF_RA_RCVD)
1da177e4 3733 goto out;
1da177e4 3734
bd11f074 3735 if (idev->rs_probes++ < idev->cnf.rtr_solicits || idev->cnf.rtr_solicits < 0) {
caf92bc4
CW		 3736 write_unlock(&idev->lock);
3737 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
3738 ndisc_send_rs(dev, &lladdr,
b7b1bfce
HFS		 3739 &in6addr_linklocal_allrouters);
3740 else
caf92bc4 3741 goto put;
1da177e4 3742
caf92bc4 3743 write_lock(&idev->lock);
bd11f074
MŻ		 3744 idev->rs_interval = rfc3315_s14_backoff_update(
3745 idev->rs_interval, idev->cnf.rtr_solicit_max_interval);
b7b1bfce
HFS		 3746 /* The wait after the last probe can be shorter */
3747 addrconf_mod_rs_timer(idev, (idev->rs_probes ==
3748 idev->cnf.rtr_solicits) ?
3749 idev->cnf.rtr_solicit_delay :
bd11f074 3750 idev->rs_interval);
1da177e4 3751 } else {
1da177e4
LT		 3752 /*
3753 * Note: we do not support deprecated "all on-link"
3754 * assumption any longer.
3755 */
91df42be 3756 pr_debug("%s: no IPv6 routers present\n", idev->dev->name);
1da177e4
LT		 3757 }
3758
3759out:
b7b1bfce 3760 write_unlock(&idev->lock);
caf92bc4 3761put:
b7b1bfce 3762 in6_dev_put(idev);
1da177e4
LT		 3763}
3764
3765/*
3766 * Duplicate Address Detection
3767 */
3c21edbd
YH		 3768static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
3769{
3770 unsigned long rand_num;
3771 struct inet6_dev *idev = ifp->idev;
adc176c5 3772 u64 nonce;
3c21edbd 3773
95c385b4
NH		 3774 if (ifp->flags & IFA_F_OPTIMISTIC)
3775 rand_num = 0;
3776 else
63862b5b 3777 rand_num = prandom_u32() % (idev->cnf.rtr_solicit_delay ? : 1);
95c385b4 3778
adc176c5
EN		 3779 nonce = 0;
3780 if (idev->cnf.enhanced_dad ||
3781 dev_net(idev->dev)->ipv6.devconf_all->enhanced_dad) {
3782 do
3783 get_random_bytes(&nonce, 6);
3784 while (nonce == 0);
3785 }
3786 ifp->dad_nonce = nonce;
b7b1bfce 3787 ifp->dad_probes = idev->cnf.dad_transmits;
c15b1cca 3788 addrconf_mod_dad_work(ifp, rand_num);
3c21edbd
YH		 3789}
3790
c15b1cca 3791static void addrconf_dad_begin(struct inet6_ifaddr *ifp)
1da177e4
LT		 3792{
3793 struct inet6_dev *idev = ifp->idev;
3794 struct net_device *dev = idev->dev;
764d3be6 3795 bool bump_id, notify = false;
1da177e4
LT		 3796
3797 addrconf_join_solict(dev, &ifp->addr);
3798
63862b5b 3799 prandom_seed((__force u32) ifp->addr.s6_addr32[3]);
1da177e4
LT		 3800
3801 read_lock_bh(&idev->lock);
622ccdf1 3802 spin_lock(&ifp->lock);
e9d3e084 3803 if (ifp->state == INET6_IFADDR_STATE_DEAD)
1da177e4 3804 goto out;
1da177e4
LT		 3805
3806 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
a2d3f3e3
MC		 3807 (dev_net(dev)->ipv6.devconf_all->accept_dad < 1 &&
3808 idev->cnf.accept_dad < 1) ||
55ebaef1
NT		 3809 !(ifp->flags&IFA_F_TENTATIVE) ||
3810 ifp->flags & IFA_F_NODAD) {
764d3be6 3811 bump_id = ifp->flags & IFA_F_TENTATIVE;
cc411d0b 3812 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
21809faf 3813 spin_unlock(&ifp->lock);
1da177e4
LT		 3814 read_unlock_bh(&idev->lock);
3815
764d3be6 3816 addrconf_dad_completed(ifp, bump_id);
1da177e4
LT		 3817 return;
3818 }
3819
6732bade 3820 if (!(idev->if_flags & IF_READY)) {
21809faf 3821 spin_unlock(&ifp->lock);
6732bade 3822 read_unlock_bh(&idev->lock);
3c21edbd 3823 /*
590a9887 3824 * If the device is not ready:
3c21edbd
YH		 3825 * - keep it tentative if it is a permanent address.
3826 * - otherwise, kill it.
3827 */
3828 in6_ifa_hold(ifp);
cc411d0b 3829 addrconf_dad_stop(ifp, 0);
6732bade 3830 return;
3c21edbd 3831 }
95c385b4
NH		 3832
3833 /*
3834 * Optimistic nodes can start receiving
3835 * Frames right away
3836 */
7fd2561e 3837 if (ifp->flags & IFA_F_OPTIMISTIC) {
95c385b4 3838 ip6_ins_rt(ifp->rt);
35e015e1 3839 if (ipv6_use_optimistic_addr(dev_net(dev), idev)) {
7fd2561e
EK		 3840 /* Because optimistic nodes can use this address,
3841 * notify listeners. If DAD fails, RTM_DELADDR is sent.
3842 */
16186a82 3843 notify = true;
7fd2561e
EK		 3844 }
3845 }
95c385b4 3846
6732bade 3847 addrconf_dad_kick(ifp);
1da177e4 3848out:
622ccdf1 3849 spin_unlock(&ifp->lock);
1da177e4 3850 read_unlock_bh(&idev->lock);
16186a82 3851 if (notify)
3852 ipv6_ifa_notify(RTM_NEWADDR, ifp);
1da177e4
LT		 3853}
3854
c15b1cca 3855static void addrconf_dad_start(struct inet6_ifaddr *ifp)
1da177e4 3856{
c15b1cca
HFS		 3857 bool begin_dad = false;
3858
8e8e676d 3859 spin_lock_bh(&ifp->lock);
c15b1cca
HFS		 3860 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
3861 ifp->state = INET6_IFADDR_STATE_PREDAD;
3862 begin_dad = true;
3863 }
8e8e676d 3864 spin_unlock_bh(&ifp->lock);
c15b1cca
HFS		 3865
3866 if (begin_dad)
3867 addrconf_mod_dad_work(ifp, 0);
3868}
3869
3870static void addrconf_dad_work(struct work_struct *w)
3871{
3872 struct inet6_ifaddr *ifp = container_of(to_delayed_work(w),
3873 struct inet6_ifaddr,
3874 dad_work);
1da177e4 3875 struct inet6_dev *idev = ifp->idev;
764d3be6 3876 bool bump_id, disable_ipv6 = false;
1da177e4
LT		 3877 struct in6_addr mcaddr;
3878
c15b1cca
HFS		 3879 enum {
3880 DAD_PROCESS,
3881 DAD_BEGIN,
3882 DAD_ABORT,
3883 } action = DAD_PROCESS;
3884
3885 rtnl_lock();
3886
8e8e676d 3887 spin_lock_bh(&ifp->lock);
c15b1cca
HFS		 3888 if (ifp->state == INET6_IFADDR_STATE_PREDAD) {
3889 action = DAD_BEGIN;
3890 ifp->state = INET6_IFADDR_STATE_DAD;
3891 } else if (ifp->state == INET6_IFADDR_STATE_ERRDAD) {
3892 action = DAD_ABORT;
3893 ifp->state = INET6_IFADDR_STATE_POSTDAD;
85b51b12 3894
35e015e1
MC		 3895 if ((dev_net(idev->dev)->ipv6.devconf_all->accept_dad > 1 ||
3896 idev->cnf.accept_dad > 1) &&
3897 !idev->cnf.disable_ipv6 &&
85b51b12
MM		 3898 !(ifp->flags & IFA_F_STABLE_PRIVACY)) {
3899 struct in6_addr addr;
3900
3901 addr.s6_addr32[0] = htonl(0xfe800000);
3902 addr.s6_addr32[1] = 0;
3903
3904 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
3905 ipv6_addr_equal(&ifp->addr, &addr)) {
3906 /* DAD failed for link-local based on MAC */
3907 idev->cnf.disable_ipv6 = 1;
3908
3909 pr_info("%s: IPv6 being disabled!\n",
3910 ifp->idev->dev->name);
3911 disable_ipv6 = true;
3912 }
3913 }
c15b1cca 3914 }
8e8e676d 3915 spin_unlock_bh(&ifp->lock);
c15b1cca
HFS		 3916
3917 if (action == DAD_BEGIN) {
3918 addrconf_dad_begin(ifp);
3919 goto out;
3920 } else if (action == DAD_ABORT) {
751eb6b6 3921 in6_ifa_hold(ifp);
c15b1cca 3922 addrconf_dad_stop(ifp, 1);
85b51b12
MM		 3923 if (disable_ipv6)
3924 addrconf_ifdown(idev->dev, 0);
c15b1cca
HFS		 3925 goto out;
3926 }
3927
b7b1bfce 3928 if (!ifp->dad_probes && addrconf_dad_end(ifp))
f2344a13
HX		 3929 goto out;
3930
c15b1cca 3931 write_lock_bh(&idev->lock);
122e4519 3932 if (idev->dead || !(idev->if_flags & IF_READY)) {
c15b1cca 3933 write_unlock_bh(&idev->lock);
1da177e4
LT		 3934 goto out;
3935 }
21809faf 3936
3937 spin_lock(&ifp->lock);
622ccdf1
HX		 3938 if (ifp->state == INET6_IFADDR_STATE_DEAD) {
3939 spin_unlock(&ifp->lock);
c15b1cca 3940 write_unlock_bh(&idev->lock);
622ccdf1
HX		 3941 goto out;
3942 }
3943
b7b1bfce 3944 if (ifp->dad_probes == 0) {
1da177e4
LT		 3945 /*
3946 * DAD was successful
3947 */
3948
764d3be6 3949 bump_id = ifp->flags & IFA_F_TENTATIVE;
cc411d0b 3950 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
21809faf 3951 spin_unlock(&ifp->lock);
c15b1cca 3952 write_unlock_bh(&idev->lock);
1da177e4 3953
764d3be6 3954 addrconf_dad_completed(ifp, bump_id);
1da177e4
LT		 3955
3956 goto out;
3957 }
3958
b7b1bfce 3959 ifp->dad_probes--;
c15b1cca
HFS		 3960 addrconf_mod_dad_work(ifp,
3961 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME));
21809faf 3962 spin_unlock(&ifp->lock);
c15b1cca 3963 write_unlock_bh(&idev->lock);
1da177e4
LT		 3964
3965 /* send a neighbour solicitation for our addr */
1da177e4 3966 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
adc176c5
EN		 3967 ndisc_send_ns(ifp->idev->dev, &ifp->addr, &mcaddr, &in6addr_any,
3968 ifp->dad_nonce);
1da177e4
LT		 3969out:
3970 in6_ifa_put(ifp);
c15b1cca 3971 rtnl_unlock();
1da177e4
LT		 3972}
3973
11ffff75
HFS		 3974/* ifp->idev must be at least read locked */
3975static bool ipv6_lonely_lladdr(struct inet6_ifaddr *ifp)
3976{
3977 struct inet6_ifaddr *ifpiter;
3978 struct inet6_dev *idev = ifp->idev;
3979
602582ca
HFS		 3980 list_for_each_entry_reverse(ifpiter, &idev->addr_list, if_list) {
3981 if (ifpiter->scope > IFA_LINK)
3982 break;
11ffff75
HFS		 3983 if (ifp != ifpiter && ifpiter->scope == IFA_LINK &&
3984 (ifpiter->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE|
3985 IFA_F_OPTIMISTIC|IFA_F_DADFAILED)) ==
3986 IFA_F_PERMANENT)
3987 return false;
3988 }
3989 return true;
3990}
3991
764d3be6 3992static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id)
1da177e4 3993{
e21e8467 3994 struct net_device *dev = ifp->idev->dev;
b7b1bfce 3995 struct in6_addr lladdr;
b173ee48 3996 bool send_rs, send_mld;
b7b1bfce 3997
c15b1cca 3998 addrconf_del_dad_work(ifp);
1da177e4
LT		 3999
4000 /*
4001 * Configure the address for reception. Now it is valid.
4002 */
4003
4004 ipv6_ifa_notify(RTM_NEWADDR, ifp);
4005
026359bc
TA		 4006 /* If added prefix is link local and we are prepared to process
4007 router advertisements, start sending router solicitations.
1da177e4
LT		 4008 */
4009
1ec047eb 4010 read_lock_bh(&ifp->idev->lock);
11ffff75 4011 send_mld = ifp->scope == IFA_LINK && ipv6_lonely_lladdr(ifp);
b173ee48
HFS		 4012 send_rs = send_mld &&
4013 ipv6_accept_ra(ifp->idev) &&
bd11f074 4014 ifp->idev->cnf.rtr_solicits != 0 &&
b173ee48 4015 (dev->flags&IFF_LOOPBACK) == 0;
1ec047eb
HFS		 4016 read_unlock_bh(&ifp->idev->lock);
4017
b173ee48
HFS		 4018 /* While dad is in progress mld report's source address is in6_addrany.
4019 * Resend with proper ll now.
4020 */
4021 if (send_mld)
4022 ipv6_mc_dad_complete(ifp->idev);
4023
1ec047eb 4024 if (send_rs) {
1da177e4
LT		 4025 /*
4026 * If a host as already performed a random delay
4027 * [...] as part of DAD [...] there is no need
4028 * to delay again before sending the first RS
4029 */
1ec047eb 4030 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
b7b1bfce 4031 return;
1ec047eb 4032 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters);
1da177e4 4033
b7b1bfce
HFS		 4034 write_lock_bh(&ifp->idev->lock);
4035 spin_lock(&ifp->lock);
bd11f074
MŻ		 4036 ifp->idev->rs_interval = rfc3315_s14_backoff_init(
4037 ifp->idev->cnf.rtr_solicit_interval);
b7b1bfce 4038 ifp->idev->rs_probes = 1;
1da177e4 4039 ifp->idev->if_flags |= IF_RS_SENT;
bd11f074 4040 addrconf_mod_rs_timer(ifp->idev, ifp->idev->rs_interval);
b7b1bfce
HFS		 4041 spin_unlock(&ifp->lock);
4042 write_unlock_bh(&ifp->idev->lock);
1da177e4 4043 }
764d3be6
PA		 4044
4045 if (bump_id)
4046 rt_genid_bump_ipv6(dev_net(dev));
a11a7f71
MH		 4047
4048 /* Make sure that a new temporary address will be created
4049 * before this temporary address becomes deprecated.
4050 */
4051 if (ifp->flags & IFA_F_TEMPORARY)
4052 addrconf_verify_rtnl();
1da177e4
LT		 4053}
4054
e21e8467
SH		 4055static void addrconf_dad_run(struct inet6_dev *idev)
4056{
c5e33bdd
YH		 4057 struct inet6_ifaddr *ifp;
4058
4059 read_lock_bh(&idev->lock);
502a2ffd 4060 list_for_each_entry(ifp, &idev->addr_list, if_list) {
21809faf 4061 spin_lock(&ifp->lock);
f2344a13
HX		 4062 if (ifp->flags & IFA_F_TENTATIVE &&
4063 ifp->state == INET6_IFADDR_STATE_DAD)
4064 addrconf_dad_kick(ifp);
21809faf 4065 spin_unlock(&ifp->lock);
c5e33bdd
YH		 4066 }
4067 read_unlock_bh(&idev->lock);
4068}
4069
1da177e4
LT		 4070#ifdef CONFIG_PROC_FS
4071struct if6_iter_state {
3c40090a 4072 struct seq_net_private p;
1da177e4 4073 int bucket;
1d578303 4074 int offset;
1da177e4
LT		 4075};
4076
1d578303 4077static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos)
1da177e4
LT		 4078{
4079 struct inet6_ifaddr *ifa = NULL;
4080 struct if6_iter_state *state = seq->private;
1218854a 4081 struct net *net = seq_file_net(seq);
1d578303 4082 int p = 0;
1da177e4 4083
1d578303
MM		 4084 /* initial bucket if pos is 0 */
4085 if (pos == 0) {
4086 state->bucket = 0;
4087 state->offset = 0;
4088 }
4089
4090 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
b67bfe0d 4091 hlist_for_each_entry_rcu_bh(ifa, &inet6_addr_lst[state->bucket],
1d578303 4092 addr_lst) {
9f0d3c27
ED		 4093 if (!net_eq(dev_net(ifa->idev->dev), net))
4094 continue;
1d578303
MM		 4095 /* sync with offset */
4096 if (p < state->offset) {
4097 p++;
4098 continue;
4099 }
4100 state->offset++;
9f0d3c27 4101 return ifa;
1d578303
MM		 4102 }
4103
4104 /* prepare for next bucket */
4105 state->offset = 0;
4106 p = 0;
1da177e4 4107 }
c2e21293 4108 return NULL;
1da177e4
LT		 4109}
4110
c2e21293 4111static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
4112 struct inet6_ifaddr *ifa)
1da177e4
LT		 4113{
4114 struct if6_iter_state *state = seq->private;
1218854a 4115 struct net *net = seq_file_net(seq);
1da177e4 4116
b67bfe0d 4117 hlist_for_each_entry_continue_rcu_bh(ifa, addr_lst) {
9f0d3c27
ED		 4118 if (!net_eq(dev_net(ifa->idev->dev), net))
4119 continue;
1d578303 4120 state->offset++;
9f0d3c27 4121 return ifa;
1d578303 4122 }
3c40090a 4123
c2e21293 4124 while (++state->bucket < IN6_ADDR_HSIZE) {
1d578303 4125 state->offset = 0;
b67bfe0d 4126 hlist_for_each_entry_rcu_bh(ifa,
c2e21293 4127 &inet6_addr_lst[state->bucket], addr_lst) {
9f0d3c27
ED		 4128 if (!net_eq(dev_net(ifa->idev->dev), net))
4129 continue;
1d578303 4130 state->offset++;
9f0d3c27 4131 return ifa;
c2e21293 4132 }
1da177e4 4133 }
3c40090a 4134
c2e21293 4135 return NULL;
1da177e4
LT		 4136}
4137
1da177e4 4138static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
4f70ecca 4139 __acquires(rcu_bh)
1da177e4 4140{
5c578aed 4141 rcu_read_lock_bh();
1d578303 4142 return if6_get_first(seq, *pos);
1da177e4
LT		 4143}
4144
4145static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
4146{
4147 struct inet6_ifaddr *ifa;
4148
4149 ifa = if6_get_next(seq, v);
4150 ++*pos;
4151 return ifa;
4152}
4153
4154static void if6_seq_stop(struct seq_file *seq, void *v)
4f70ecca 4155 __releases(rcu_bh)
1da177e4 4156{
5c578aed 4157 rcu_read_unlock_bh();
1da177e4
LT		 4158}
4159
4160static int if6_seq_show(struct seq_file *seq, void *v)
4161{
4162 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
971a351c 4163 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
b071195d 4164 &ifp->addr,
1da177e4
LT		 4165 ifp->idev->dev->ifindex,
4166 ifp->prefix_len,
4167 ifp->scope,
971a351c 4168 (u8) ifp->flags,
1da177e4
LT		 4169 ifp->idev->dev->name);
4170 return 0;
4171}
4172
56b3d975 4173static const struct seq_operations if6_seq_ops = {
1da177e4
LT		 4174 .start = if6_seq_start,
4175 .next = if6_seq_next,
4176 .show = if6_seq_show,
4177 .stop = if6_seq_stop,
4178};
4179
4180static int if6_seq_open(struct inode *inode, struct file *file)
4181{
3c40090a
DL		 4182 return seq_open_net(inode, file, &if6_seq_ops,
4183 sizeof(struct if6_iter_state));
1da177e4
LT		 4184}
4185
9a32144e 4186static const struct file_operations if6_fops = {
1da177e4
LT		 4187 .owner = THIS_MODULE,
4188 .open = if6_seq_open,
4189 .read = seq_read,
4190 .llseek = seq_lseek,
3c40090a 4191 .release = seq_release_net,
1da177e4
LT		 4192};
4193
2c8c1e72 4194static int __net_init if6_proc_net_init(struct net *net)
1da177e4 4195{
d4beaa66 4196 if (!proc_create("if_inet6", S_IRUGO, net->proc_net, &if6_fops))
1da177e4
LT		 4197 return -ENOMEM;
4198 return 0;
4199}
4200
2c8c1e72 4201static void __net_exit if6_proc_net_exit(struct net *net)
3c40090a 4202{
ece31ffd 4203 remove_proc_entry("if_inet6", net->proc_net);
3c40090a
DL		 4204}
4205
4206static struct pernet_operations if6_proc_net_ops = {
67ba4152
IM		 4207 .init = if6_proc_net_init,
4208 .exit = if6_proc_net_exit,
3c40090a
DL		 4209};
4210
4211int __init if6_proc_init(void)
4212{
4213 return register_pernet_subsys(&if6_proc_net_ops);
4214}
4215
1da177e4
LT		 4216void if6_proc_exit(void)
4217{
3c40090a 4218 unregister_pernet_subsys(&if6_proc_net_ops);
1da177e4
LT		 4219}
4220#endif /* CONFIG_PROC_FS */
4221
07a93626 4222#if IS_ENABLED(CONFIG_IPV6_MIP6)
3b9f9a1c 4223/* Check if address is a home address configured on any interface. */
b71d1d42 4224int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr)
3b9f9a1c
NT		 4225{
4226 int ret = 0;
c2e21293 4227 struct inet6_ifaddr *ifp = NULL;
ddbe5032 4228 unsigned int hash = inet6_addr_hash(addr);
c2e21293 4229
5c578aed 4230 rcu_read_lock_bh();
b67bfe0d 4231 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
878628fb 4232 if (!net_eq(dev_net(ifp->idev->dev), net))
389f6612 4233 continue;
caad295f 4234 if (ipv6_addr_equal(&ifp->addr, addr) &&
3b9f9a1c
NT		 4235 (ifp->flags & IFA_F_HOMEADDRESS)) {
4236 ret = 1;
4237 break;
4238 }
4239 }
5c578aed 4240 rcu_read_unlock_bh();
3b9f9a1c
NT		 4241 return ret;
4242}
4243#endif
4244
1da177e4
LT		 4245/*
4246 * Periodic address status verification
4247 */
4248
c15b1cca 4249static void addrconf_verify_rtnl(void)
1da177e4 4250{
b2db7564 4251 unsigned long now, next, next_sec, next_sched;
1da177e4 4252 struct inet6_ifaddr *ifp;
1da177e4
LT		 4253 int i;
4254
c15b1cca
HFS		 4255 ASSERT_RTNL();
4256
5c578aed 4257 rcu_read_lock_bh();
1da177e4 4258 now = jiffies;
b2db7564 4259 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
1da177e4 4260
c15b1cca 4261 cancel_delayed_work(&addr_chk_work);
1da177e4 4262
bcdd553f 4263 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
1da177e4 4264restart:
c15b1cca 4265 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[i], addr_lst) {
1da177e4 4266 unsigned long age;
1da177e4 4267
fad8da3e
YA		 4268 /* When setting preferred_lft to a value not zero or
4269 * infinity, while valid_lft is infinity
4270 * IFA_F_PERMANENT has a non-infinity life time.
4271 */
4272 if ((ifp->flags & IFA_F_PERMANENT) &&
4273 (ifp->prefered_lft == INFINITY_LIFE_TIME))
1da177e4
LT		 4274 continue;
4275
4276 spin_lock(&ifp->lock);
b2db7564
YH		 4277 /* We try to batch several events at once. */
4278 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
1da177e4 4279
8f27ebb9
YH		 4280 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
4281 age >= ifp->valid_lft) {
1da177e4
LT		 4282 spin_unlock(&ifp->lock);
4283 in6_ifa_hold(ifp);
1da177e4
LT		 4284 ipv6_del_addr(ifp);
4285 goto restart;
8f27ebb9
YH		 4286 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
4287 spin_unlock(&ifp->lock);
4288 continue;
1da177e4 4289 } else if (age >= ifp->prefered_lft) {
a1ed0526 4290 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
1da177e4
LT		 4291 int deprecate = 0;
4292
4293 if (!(ifp->flags&IFA_F_DEPRECATED)) {
4294 deprecate = 1;
4295 ifp->flags |= IFA_F_DEPRECATED;
4296 }
4297
fad8da3e
YA		 4298 if ((ifp->valid_lft != INFINITY_LIFE_TIME) &&
4299 (time_before(ifp->tstamp + ifp->valid_lft * HZ, next)))
1da177e4
LT		 4300 next = ifp->tstamp + ifp->valid_lft * HZ;
4301
4302 spin_unlock(&ifp->lock);
4303
4304 if (deprecate) {
4305 in6_ifa_hold(ifp);
1da177e4
LT		 4306
4307 ipv6_ifa_notify(0, ifp);
4308 in6_ifa_put(ifp);
4309 goto restart;
4310 }
1da177e4
LT		 4311 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
4312 !(ifp->flags&IFA_F_TENTATIVE)) {
88949cf4 4313 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
4314 ifp->idev->cnf.dad_transmits *
1f9248e5 4315 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME) / HZ;
88949cf4 4316
1da177e4
LT		 4317 if (age >= ifp->prefered_lft - regen_advance) {
4318 struct inet6_ifaddr *ifpub = ifp->ifpub;
4319 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
4320 next = ifp->tstamp + ifp->prefered_lft * HZ;
4321 if (!ifp->regen_count && ifpub) {
4322 ifp->regen_count++;
4323 in6_ifa_hold(ifp);
4324 in6_ifa_hold(ifpub);
4325 spin_unlock(&ifp->lock);
5c578aed 4326
291d809b
HY		 4327 spin_lock(&ifpub->lock);
4328 ifpub->regen_count = 0;
4329 spin_unlock(&ifpub->lock);
1da177e4
LT		 4330 ipv6_create_tempaddr(ifpub, ifp);
4331 in6_ifa_put(ifpub);
4332 in6_ifa_put(ifp);
4333 goto restart;
4334 }
4335 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
4336 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
4337 spin_unlock(&ifp->lock);
1da177e4
LT		 4338 } else {
4339 /* ifp->prefered_lft <= ifp->valid_lft */
4340 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
4341 next = ifp->tstamp + ifp->prefered_lft * HZ;
4342 spin_unlock(&ifp->lock);
4343 }
4344 }
1da177e4
LT		 4345 }
4346
b2db7564
YH		 4347 next_sec = round_jiffies_up(next);
4348 next_sched = next;
4349
4350 /* If rounded timeout is accurate enough, accept it. */
4351 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
4352 next_sched = next_sec;
4353
4354 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
4355 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
4356 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
4357
ba3542e1 4358 ADBG(KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
4359 now, next, next_sec, next_sched);
c15b1cca 4360 mod_delayed_work(addrconf_wq, &addr_chk_work, next_sched - now);
5c578aed 4361 rcu_read_unlock_bh();
1da177e4
LT		 4362}
4363
c15b1cca
HFS		 4364static void addrconf_verify_work(struct work_struct *w)
4365{
4366 rtnl_lock();
4367 addrconf_verify_rtnl();
4368 rtnl_unlock();
4369}
4370
4371static void addrconf_verify(void)
4372{
4373 mod_delayed_work(addrconf_wq, &addr_chk_work, 0);
4374}
4375
caeaba79
ND		 4376static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local,
4377 struct in6_addr **peer_pfx)
461d8837
TG		 4378{
4379 struct in6_addr *pfx = NULL;
4380
caeaba79
ND		 4381 *peer_pfx = NULL;
4382
461d8837
TG		 4383 if (addr)
4384 pfx = nla_data(addr);
4385
4386 if (local) {
4387 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
caeaba79
ND		 4388 *peer_pfx = pfx;
4389 pfx = nla_data(local);
461d8837
TG		 4390 }
4391
4392 return pfx;
4393}
4394
ef7c79ed 4395static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
461d8837
TG		 4396 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
4397 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
4398 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
479840ff 4399 [IFA_FLAGS] = { .len = sizeof(u32) },
461d8837
TG		 4400};
4401
1da177e4 4402static int
c21ef3e3
DA		 4403inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh,
4404 struct netlink_ext_ack *extack)
1da177e4 4405{
3b1e0a65 4406 struct net *net = sock_net(skb->sk);
b933f716
TG		 4407 struct ifaddrmsg *ifm;
4408 struct nlattr *tb[IFA_MAX+1];
caeaba79 4409 struct in6_addr *pfx, *peer_pfx;
6046d5b4 4410 u32 ifa_flags;
b933f716 4411 int err;
1da177e4 4412
fceb6435 4413 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy,
c21ef3e3 4414 extack);
b933f716
TG		 4415 if (err < 0)
4416 return err;
4417
4418 ifm = nlmsg_data(nlh);
caeaba79 4419 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
63159f29 4420 if (!pfx)
1da177e4
LT		 4421 return -EINVAL;
4422
6046d5b4
HK		 4423 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
4424
4425 /* We ignore other flags so far. */
4426 ifa_flags &= IFA_F_MANAGETEMPADDR;
4427
4428 return inet6_addr_del(net, ifm->ifa_index, ifa_flags, pfx,
4429 ifm->ifa_prefixlen);
1da177e4
LT		 4430}
4431
479840ff 4432static int inet6_addr_modify(struct inet6_ifaddr *ifp, u32 ifa_flags,
55ebaef1 4433 u32 prefered_lft, u32 valid_lft)
081bba5b 4434{
6f704992
YH		 4435 u32 flags;
4436 clock_t expires;
4bed72e4 4437 unsigned long timeout;
53bd6749 4438 bool was_managetempaddr;
5b84efec 4439 bool had_prefixroute;
46d48046 4440
c15b1cca
HFS		 4441 ASSERT_RTNL();
4442
081bba5b
NT		 4443 if (!valid_lft || (prefered_lft > valid_lft))
4444 return -EINVAL;
4445
53bd6749
JP		 4446 if (ifa_flags & IFA_F_MANAGETEMPADDR &&
4447 (ifp->flags & IFA_F_TEMPORARY || ifp->prefix_len != 64))
4448 return -EINVAL;
4449
4bed72e4
YH		 4450 timeout = addrconf_timeout_fixup(valid_lft, HZ);
4451 if (addrconf_finite_timeout(timeout)) {
4452 expires = jiffies_to_clock_t(timeout * HZ);
4453 valid_lft = timeout;
6f704992 4454 flags = RTF_EXPIRES;
4bed72e4
YH		 4455 } else {
4456 expires = 0;
4457 flags = 0;
4458 ifa_flags |= IFA_F_PERMANENT;
6f704992 4459 }
081bba5b 4460
4bed72e4
YH		 4461 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
4462 if (addrconf_finite_timeout(timeout)) {
4463 if (timeout == 0)
4464 ifa_flags |= IFA_F_DEPRECATED;
4465 prefered_lft = timeout;
4466 }
081bba5b
NT		 4467
4468 spin_lock_bh(&ifp->lock);
53bd6749 4469 was_managetempaddr = ifp->flags & IFA_F_MANAGETEMPADDR;
5b84efec
TH		 4470 had_prefixroute = ifp->flags & IFA_F_PERMANENT &&
4471 !(ifp->flags & IFA_F_NOPREFIXROUTE);
53bd6749 4472 ifp->flags &= ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD |
761aac73
TH		 4473 IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
4474 IFA_F_NOPREFIXROUTE);
53bd6749 4475 ifp->flags |= ifa_flags;
081bba5b
NT		 4476 ifp->tstamp = jiffies;
4477 ifp->valid_lft = valid_lft;
4478 ifp->prefered_lft = prefered_lft;
4479
4480 spin_unlock_bh(&ifp->lock);
4481 if (!(ifp->flags&IFA_F_TENTATIVE))
4482 ipv6_ifa_notify(0, ifp);
081bba5b 4483
761aac73
TH		 4484 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) {
4485 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
4486 expires, flags);
5b84efec
TH		 4487 } else if (had_prefixroute) {
4488 enum cleanup_prefix_rt_t action;
4489 unsigned long rt_expires;
4490
4491 write_lock_bh(&ifp->idev->lock);
4492 action = check_cleanup_prefix_route(ifp, &rt_expires);
4493 write_unlock_bh(&ifp->idev->lock);
4494
4495 if (action != CLEANUP_PREFIX_RT_NOP) {
4496 cleanup_prefix_route(ifp, rt_expires,
4497 action == CLEANUP_PREFIX_RT_DEL);
4498 }
761aac73 4499 }
53bd6749
JP		 4500
4501 if (was_managetempaddr || ifp->flags & IFA_F_MANAGETEMPADDR) {
4502 if (was_managetempaddr && !(ifp->flags & IFA_F_MANAGETEMPADDR))
4503 valid_lft = prefered_lft = 0;
4504 manage_tempaddrs(ifp->idev, ifp, valid_lft, prefered_lft,
4505 !was_managetempaddr, jiffies);
4506 }
4507
c15b1cca 4508 addrconf_verify_rtnl();
081bba5b
NT		 4509
4510 return 0;
4511}
4512
1da177e4 4513static int
c21ef3e3
DA		 4514inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh,
4515 struct netlink_ext_ack *extack)
1da177e4 4516{
3b1e0a65 4517 struct net *net = sock_net(skb->sk);
461d8837
TG		 4518 struct ifaddrmsg *ifm;
4519 struct nlattr *tb[IFA_MAX+1];
caeaba79 4520 struct in6_addr *pfx, *peer_pfx;
7198f8ce
TG		 4521 struct inet6_ifaddr *ifa;
4522 struct net_device *dev;
55ebaef1 4523 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
479840ff 4524 u32 ifa_flags;
461d8837 4525 int err;
1da177e4 4526
fceb6435 4527 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy,
c21ef3e3 4528 extack);
461d8837
TG		 4529 if (err < 0)
4530 return err;
4531
4532 ifm = nlmsg_data(nlh);
caeaba79 4533 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
63159f29 4534 if (!pfx)
1da177e4
LT		 4535 return -EINVAL;
4536
461d8837 4537 if (tb[IFA_CACHEINFO]) {
0778769d 4538 struct ifa_cacheinfo *ci;
461d8837
TG		 4539
4540 ci = nla_data(tb[IFA_CACHEINFO]);
0778769d 4541 valid_lft = ci->ifa_valid;
461d8837
TG		 4542 preferred_lft = ci->ifa_prefered;
4543 } else {
4544 preferred_lft = INFINITY_LIFE_TIME;
4545 valid_lft = INFINITY_LIFE_TIME;
0778769d
NT		 4546 }
4547
af284937 4548 dev = __dev_get_by_index(net, ifm->ifa_index);
63159f29 4549 if (!dev)
7198f8ce
TG		 4550 return -ENODEV;
4551
479840ff
JP		 4552 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
4553
55ebaef1 4554 /* We ignore other flags so far. */
761aac73 4555 ifa_flags &= IFA_F_NODAD | IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
93a714d6 4556 IFA_F_NOPREFIXROUTE | IFA_F_MCAUTOJOIN;
55ebaef1 4557
1cab3da6 4558 ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
63159f29 4559 if (!ifa) {
7198f8ce
TG		 4560 /*
4561 * It would be best to check for !NLM_F_CREATE here but
db9c7c39 4562 * userspace already relies on not having to provide this.
7198f8ce 4563 */
caeaba79 4564 return inet6_addr_add(net, ifm->ifa_index, pfx, peer_pfx,
af284937
DL		 4565 ifm->ifa_prefixlen, ifa_flags,
4566 preferred_lft, valid_lft);
081bba5b
NT		 4567 }
4568
7198f8ce
TG		 4569 if (nlh->nlmsg_flags & NLM_F_EXCL ||
4570 !(nlh->nlmsg_flags & NLM_F_REPLACE))
4571 err = -EEXIST;
4572 else
55ebaef1 4573 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
7198f8ce
TG		 4574
4575 in6_ifa_put(ifa);
4576
4577 return err;
1da177e4
LT		 4578}
4579
479840ff 4580static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u32 flags,
101bb229
TG		 4581 u8 scope, int ifindex)
4582{
4583 struct ifaddrmsg *ifm;
4584
4585 ifm = nlmsg_data(nlh);
4586 ifm->ifa_family = AF_INET6;
4587 ifm->ifa_prefixlen = prefixlen;
4588 ifm->ifa_flags = flags;
4589 ifm->ifa_scope = scope;
4590 ifm->ifa_index = ifindex;
4591}
4592
85486af0
TG		 4593static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
4594 unsigned long tstamp, u32 preferred, u32 valid)
4595{
4596 struct ifa_cacheinfo ci;
4597
18a31e1e
TG		 4598 ci.cstamp = cstamp_delta(cstamp);
4599 ci.tstamp = cstamp_delta(tstamp);
85486af0
TG		 4600 ci.ifa_prefered = preferred;
4601 ci.ifa_valid = valid;
4602
4603 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
4604}
4605
101bb229
TG		 4606static inline int rt_scope(int ifa_scope)
4607{
4608 if (ifa_scope & IFA_HOST)
4609 return RT_SCOPE_HOST;
4610 else if (ifa_scope & IFA_LINK)
4611 return RT_SCOPE_LINK;
4612 else if (ifa_scope & IFA_SITE)
4613 return RT_SCOPE_SITE;
4614 else
4615 return RT_SCOPE_UNIVERSE;
4616}
4617
0ab6803b
TG		 4618static inline int inet6_ifaddr_msgsize(void)
4619{
339bf98f 4620 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
caeaba79 4621 + nla_total_size(16) /* IFA_LOCAL */
339bf98f 4622 + nla_total_size(16) /* IFA_ADDRESS */
479840ff
JP		 4623 + nla_total_size(sizeof(struct ifa_cacheinfo))
4624 + nla_total_size(4) /* IFA_FLAGS */;
0ab6803b 4625}
c5396a31 4626
1da177e4 4627static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
15e47304 4628 u32 portid, u32 seq, int event, unsigned int flags)
1da177e4 4629{
1da177e4 4630 struct nlmsghdr *nlh;
85486af0 4631 u32 preferred, valid;
1da177e4 4632
15e47304 4633 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
63159f29 4634 if (!nlh)
26932566 4635 return -EMSGSIZE;
0ab6803b 4636
101bb229
TG		 4637 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
4638 ifa->idev->dev->ifindex);
4639
fad8da3e
YA		 4640 if (!((ifa->flags&IFA_F_PERMANENT) &&
4641 (ifa->prefered_lft == INFINITY_LIFE_TIME))) {
85486af0
TG		 4642 preferred = ifa->prefered_lft;
4643 valid = ifa->valid_lft;
4644 if (preferred != INFINITY_LIFE_TIME) {
1da177e4 4645 long tval = (jiffies - ifa->tstamp)/HZ;
a1faa698
JR		 4646 if (preferred > tval)
4647 preferred -= tval;
4648 else
4649 preferred = 0;
f56619fc
BH		 4650 if (valid != INFINITY_LIFE_TIME) {
4651 if (valid > tval)
4652 valid -= tval;
4653 else
4654 valid = 0;
4655 }
1da177e4
LT		 4656 }
4657 } else {
85486af0
TG		 4658 preferred = INFINITY_LIFE_TIME;
4659 valid = INFINITY_LIFE_TIME;
4660 }
4661
7996c799 4662 if (!ipv6_addr_any(&ifa->peer_addr)) {
930345ea
JB		 4663 if (nla_put_in6_addr(skb, IFA_LOCAL, &ifa->addr) < 0 ||
4664 nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->peer_addr) < 0)
caeaba79
ND		 4665 goto error;
4666 } else
930345ea 4667 if (nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->addr) < 0)
caeaba79
ND		 4668 goto error;
4669
4670 if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0)
4671 goto error;
1da177e4 4672
479840ff
JP		 4673 if (nla_put_u32(skb, IFA_FLAGS, ifa->flags) < 0)
4674 goto error;
4675
053c095a
JB		 4676 nlmsg_end(skb, nlh);
4677 return 0;
caeaba79
ND		 4678
4679error:
4680 nlmsg_cancel(skb, nlh);
4681 return -EMSGSIZE;
1da177e4
LT		 4682}
4683
4684static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
15e47304 4685 u32 portid, u32 seq, int event, u16 flags)
1da177e4 4686{
1da177e4 4687 struct nlmsghdr *nlh;
101bb229
TG		 4688 u8 scope = RT_SCOPE_UNIVERSE;
4689 int ifindex = ifmca->idev->dev->ifindex;
4690
4691 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
4692 scope = RT_SCOPE_SITE;
1da177e4 4693
15e47304 4694 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
63159f29 4695 if (!nlh)
26932566 4696 return -EMSGSIZE;
85486af0 4697
0ab6803b 4698 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
930345ea 4699 if (nla_put_in6_addr(skb, IFA_MULTICAST, &ifmca->mca_addr) < 0 ||
0ab6803b 4700 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
26932566
PM		 4701 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
4702 nlmsg_cancel(skb, nlh);
4703 return -EMSGSIZE;
4704 }
85486af0 4705
053c095a
JB		 4706 nlmsg_end(skb, nlh);
4707 return 0;
1da177e4
LT		 4708}
4709
4710static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
15e47304 4711 u32 portid, u32 seq, int event, unsigned int flags)
1da177e4 4712{
1da177e4 4713 struct nlmsghdr *nlh;
101bb229
TG		 4714 u8 scope = RT_SCOPE_UNIVERSE;
4715 int ifindex = ifaca->aca_idev->dev->ifindex;
4716
4717 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
4718 scope = RT_SCOPE_SITE;
1da177e4 4719
15e47304 4720 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
63159f29 4721 if (!nlh)
26932566 4722 return -EMSGSIZE;
85486af0 4723
0ab6803b 4724 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
930345ea 4725 if (nla_put_in6_addr(skb, IFA_ANYCAST, &ifaca->aca_addr) < 0 ||
0ab6803b 4726 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
26932566
PM		 4727 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
4728 nlmsg_cancel(skb, nlh);
4729 return -EMSGSIZE;
4730 }
1da177e4 4731
053c095a
JB		 4732 nlmsg_end(skb, nlh);
4733 return 0;
1da177e4
LT		 4734}
4735
e21e8467 4736enum addr_type_t {
1da177e4
LT		 4737 UNICAST_ADDR,
4738 MULTICAST_ADDR,
4739 ANYCAST_ADDR,
4740};
4741
234b27c3
ED		 4742/* called with rcu_read_lock() */
4743static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
4744 struct netlink_callback *cb, enum addr_type_t type,
4745 int s_ip_idx, int *p_ip_idx)
4746{
234b27c3
ED		 4747 struct ifmcaddr6 *ifmca;
4748 struct ifacaddr6 *ifaca;
4749 int err = 1;
4750 int ip_idx = *p_ip_idx;
4751
4752 read_lock_bh(&idev->lock);
4753 switch (type) {
502a2ffd 4754 case UNICAST_ADDR: {
4755 struct inet6_ifaddr *ifa;
4756
234b27c3 4757 /* unicast address incl. temp addr */
502a2ffd 4758 list_for_each_entry(ifa, &idev->addr_list, if_list) {
4759 if (++ip_idx < s_ip_idx)
234b27c3
ED		 4760 continue;
4761 err = inet6_fill_ifaddr(skb, ifa,
15e47304 4762 NETLINK_CB(cb->skb).portid,
234b27c3
ED		 4763 cb->nlh->nlmsg_seq,
4764 RTM_NEWADDR,
4765 NLM_F_MULTI);
053c095a 4766 if (err < 0)
234b27c3 4767 break;
63998ac2 4768 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
234b27c3
ED		 4769 }
4770 break;
502a2ffd 4771 }
234b27c3
ED		 4772 case MULTICAST_ADDR:
4773 /* multicast address */
4774 for (ifmca = idev->mc_list; ifmca;
4775 ifmca = ifmca->next, ip_idx++) {
4776 if (ip_idx < s_ip_idx)
4777 continue;
4778 err = inet6_fill_ifmcaddr(skb, ifmca,
15e47304 4779 NETLINK_CB(cb->skb).portid,
234b27c3
ED		 4780 cb->nlh->nlmsg_seq,
4781 RTM_GETMULTICAST,
4782 NLM_F_MULTI);
053c095a 4783 if (err < 0)
234b27c3
ED		 4784 break;
4785 }
4786 break;
4787 case ANYCAST_ADDR:
4788 /* anycast address */
4789 for (ifaca = idev->ac_list; ifaca;
4790 ifaca = ifaca->aca_next, ip_idx++) {
4791 if (ip_idx < s_ip_idx)
4792 continue;
4793 err = inet6_fill_ifacaddr(skb, ifaca,
15e47304 4794 NETLINK_CB(cb->skb).portid,
234b27c3
ED		 4795 cb->nlh->nlmsg_seq,
4796 RTM_GETANYCAST,
4797 NLM_F_MULTI);
053c095a 4798 if (err < 0)
234b27c3
ED		 4799 break;
4800 }
4801 break;
4802 default:
4803 break;
4804 }
4805 read_unlock_bh(&idev->lock);
4806 *p_ip_idx = ip_idx;
4807 return err;
4808}
4809
1da177e4
LT		 4810static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
4811 enum addr_type_t type)
4812{
234b27c3
ED		 4813 struct net *net = sock_net(skb->sk);
4814 int h, s_h;
1da177e4
LT		 4815 int idx, ip_idx;
4816 int s_idx, s_ip_idx;
1da177e4 4817 struct net_device *dev;
234b27c3
ED		 4818 struct inet6_dev *idev;
4819 struct hlist_head *head;
1ab1457c 4820
234b27c3
ED		 4821 s_h = cb->args[0];
4822 s_idx = idx = cb->args[1];
4823 s_ip_idx = ip_idx = cb->args[2];
5d5619b4 4824
234b27c3 4825 rcu_read_lock();
63998ac2 4826 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ net->dev_base_seq;
234b27c3
ED		 4827 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4828 idx = 0;
4829 head = &net->dev_index_head[h];
b67bfe0d 4830 hlist_for_each_entry_rcu(dev, head, index_hlist) {
234b27c3
ED		 4831 if (idx < s_idx)
4832 goto cont;
4b97efdf 4833 if (h > s_h || idx > s_idx)
234b27c3
ED		 4834 s_ip_idx = 0;
4835 ip_idx = 0;
e21e8467
SH		 4836 idev = __in6_dev_get(dev);
4837 if (!idev)
234b27c3
ED		 4838 goto cont;
4839
4840 if (in6_dump_addrs(idev, skb, cb, type,
7b46a644 4841 s_ip_idx, &ip_idx) < 0)
234b27c3 4842 goto done;
7562f876 4843cont:
234b27c3
ED		 4844 idx++;
4845 }
1da177e4 4846 }
234b27c3
ED		 4847done:
4848 rcu_read_unlock();
4849 cb->args[0] = h;
4850 cb->args[1] = idx;
4851 cb->args[2] = ip_idx;
4852
1da177e4
LT		 4853 return skb->len;
4854}
4855
4856static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
4857{
4858 enum addr_type_t type = UNICAST_ADDR;
b854272b 4859
1da177e4
LT		 4860 return inet6_dump_addr(skb, cb, type);
4861}
4862
4863static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
4864{
4865 enum addr_type_t type = MULTICAST_ADDR;
b854272b 4866
1da177e4
LT		 4867 return inet6_dump_addr(skb, cb, type);
4868}
4869
4870
4871static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
4872{
4873 enum addr_type_t type = ANYCAST_ADDR;
b854272b 4874
1da177e4
LT		 4875 return inet6_dump_addr(skb, cb, type);
4876}
4877
c21ef3e3
DA		 4878static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh,
4879 struct netlink_ext_ack *extack)
6c223828 4880{
3b1e0a65 4881 struct net *net = sock_net(in_skb->sk);
1b29fc2c
TG		 4882 struct ifaddrmsg *ifm;
4883 struct nlattr *tb[IFA_MAX+1];
caeaba79 4884 struct in6_addr *addr = NULL, *peer;
6c223828
NT		 4885 struct net_device *dev = NULL;
4886 struct inet6_ifaddr *ifa;
4887 struct sk_buff *skb;
6c223828
NT		 4888 int err;
4889
fceb6435 4890 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy,
c21ef3e3 4891 extack);
1b29fc2c 4892 if (err < 0)
c24675f8 4893 return err;
1b29fc2c 4894
caeaba79 4895 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer);
c24675f8
FW		 4896 if (!addr)
4897 return -EINVAL;
6c223828 4898
1b29fc2c 4899 ifm = nlmsg_data(nlh);
6c223828 4900 if (ifm->ifa_index)
c24675f8 4901 dev = dev_get_by_index(net, ifm->ifa_index);
6c223828 4902
e21e8467
SH		 4903 ifa = ipv6_get_ifaddr(net, addr, dev, 1);
4904 if (!ifa) {
1b29fc2c
TG		 4905 err = -EADDRNOTAVAIL;
4906 goto errout;
4907 }
6c223828 4908
e21e8467
SH		 4909 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
4910 if (!skb) {
6c223828 4911 err = -ENOBUFS;
1b29fc2c 4912 goto errout_ifa;
6c223828
NT		 4913 }
4914
15e47304 4915 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).portid,
6c223828 4916 nlh->nlmsg_seq, RTM_NEWADDR, 0);
26932566
PM		 4917 if (err < 0) {
4918 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4919 WARN_ON(err == -EMSGSIZE);
4920 kfree_skb(skb);
4921 goto errout_ifa;
4922 }
15e47304 4923 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
1b29fc2c 4924errout_ifa:
6c223828 4925 in6_ifa_put(ifa);
1b29fc2c 4926errout:
c24675f8
FW		 4927 if (dev)
4928 dev_put(dev);
6c223828 4929 return err;
6c223828
NT		 4930}
4931
1da177e4
LT		 4932static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
4933{
4934 struct sk_buff *skb;
c346dca1 4935 struct net *net = dev_net(ifa->idev->dev);
5d620266 4936 int err = -ENOBUFS;
1da177e4 4937
f784ad3d
MB		 4938 /* Don't send DELADDR notification for TENTATIVE address,
4939 * since NEWADDR notification is sent only after removing
6819a14e 4940 * TENTATIVE flag, if DAD has not failed.
f784ad3d 4941 */
6819a14e
MM		 4942 if (ifa->flags & IFA_F_TENTATIVE && !(ifa->flags & IFA_F_DADFAILED) &&
4943 event == RTM_DELADDR)
f784ad3d
MB		 4944 return;
4945
0ab6803b 4946 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
63159f29 4947 if (!skb)
5d620266
TG		 4948 goto errout;
4949
4950 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
26932566
PM		 4951 if (err < 0) {
4952 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4953 WARN_ON(err == -EMSGSIZE);
4954 kfree_skb(skb);
4955 goto errout;
4956 }
1ce85fe4
PNA		 4957 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
4958 return;
5d620266
TG		 4959errout:
4960 if (err < 0)
6fda7350 4961 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
1da177e4
LT		 4962}
4963
b6f99a21 4964static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
1da177e4
LT		 4965 __s32 *array, int bytes)
4966{
04561c1f
TG		 4967 BUG_ON(bytes < (DEVCONF_MAX * 4));
4968
1da177e4
LT		 4969 memset(array, 0, bytes);
4970 array[DEVCONF_FORWARDING] = cnf->forwarding;
4971 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
4972 array[DEVCONF_MTU6] = cnf->mtu6;
4973 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
4974 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
4975 array[DEVCONF_AUTOCONF] = cnf->autoconf;
4976 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
4977 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
93908d19
TG		 4978 array[DEVCONF_RTR_SOLICIT_INTERVAL] =
4979 jiffies_to_msecs(cnf->rtr_solicit_interval);
bd11f074
MŻ		 4980 array[DEVCONF_RTR_SOLICIT_MAX_INTERVAL] =
4981 jiffies_to_msecs(cnf->rtr_solicit_max_interval);
93908d19
TG		 4982 array[DEVCONF_RTR_SOLICIT_DELAY] =
4983 jiffies_to_msecs(cnf->rtr_solicit_delay);
1da177e4 4984 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
fc4eba58
HFS		 4985 array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] =
4986 jiffies_to_msecs(cnf->mldv1_unsolicited_report_interval);
4987 array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] =
4988 jiffies_to_msecs(cnf->mldv2_unsolicited_report_interval);
1da177e4
LT		 4989 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
4990 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
4991 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
4992 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
4993 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
1da177e4 4994 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
65f5c7c1 4995 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
8013d1d7 4996 array[DEVCONF_ACCEPT_RA_MIN_HOP_LIMIT] = cnf->accept_ra_min_hop_limit;
c4fd30eb 4997 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
930d6ff2
YH		 4998#ifdef CONFIG_IPV6_ROUTER_PREF
4999 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
93908d19
TG		 5000 array[DEVCONF_RTR_PROBE_INTERVAL] =
5001 jiffies_to_msecs(cnf->rtr_probe_interval);
fa03ef38 5002#ifdef CONFIG_IPV6_ROUTE_INFO
bbea124b 5003 array[DEVCONF_ACCEPT_RA_RT_INFO_MIN_PLEN] = cnf->accept_ra_rt_info_min_plen;
09c884d4
YH		 5004 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
5005#endif
930d6ff2 5006#endif
fbea49e1 5007 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
0bcbc926 5008 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
95c385b4
NH		 5009#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
5010 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
7fd2561e 5011 array[DEVCONF_USE_OPTIMISTIC] = cnf->use_optimistic;
95c385b4 5012#endif
7bc570c8
YH		 5013#ifdef CONFIG_IPV6_MROUTE
5014 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
5015#endif
778d80be 5016 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
1b34be74 5017 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
c3faca05 5018 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
5cb04436 5019 array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify;
b800c3b9 5020 array[DEVCONF_SUPPRESS_FRAG_NDISC] = cnf->suppress_frag_ndisc;
d9333196 5021 array[DEVCONF_ACCEPT_RA_FROM_LOCAL] = cnf->accept_ra_from_local;
c2943f14 5022 array[DEVCONF_ACCEPT_RA_MTU] = cnf->accept_ra_mtu;
35103d11 5023 array[DEVCONF_IGNORE_ROUTES_WITH_LINKDOWN] = cnf->ignore_routes_with_linkdown;
3d1bec99 5024 /* we omit DEVCONF_STABLE_SECRET for now */
3985e8a3 5025 array[DEVCONF_USE_OIF_ADDRS_ONLY] = cnf->use_oif_addrs_only;
abbc3043 5026 array[DEVCONF_DROP_UNICAST_IN_L2_MULTICAST] = cnf->drop_unicast_in_l2_multicast;
7a02bf89 5027 array[DEVCONF_DROP_UNSOLICITED_NA] = cnf->drop_unsolicited_na;
f1705ec1 5028 array[DEVCONF_KEEP_ADDR_ON_DOWN] = cnf->keep_addr_on_down;
1ababeba 5029 array[DEVCONF_SEG6_ENABLED] = cnf->seg6_enabled;
bf355b8d
DL		 5030#ifdef CONFIG_IPV6_SEG6_HMAC
5031 array[DEVCONF_SEG6_REQUIRE_HMAC] = cnf->seg6_require_hmac;
5032#endif
adc176c5 5033 array[DEVCONF_ENHANCED_DAD] = cnf->enhanced_dad;
d35a00b8 5034 array[DEVCONF_ADDR_GEN_MODE] = cnf->addr_gen_mode;
df789fe7 5035 array[DEVCONF_DISABLE_POLICY] = cnf->disable_policy;
1da177e4
LT		 5036}
5037
b382b191
TG		 5038static inline size_t inet6_ifla6_size(void)
5039{
5040 return nla_total_size(4) /* IFLA_INET6_FLAGS */
5041 + nla_total_size(sizeof(struct ifla_cacheinfo))
5042 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
5043 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
f53adae4
DB		 5044 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
5045 + nla_total_size(sizeof(struct in6_addr)); /* IFLA_INET6_TOKEN */
b382b191
TG		 5046}
5047
339bf98f
TG		 5048static inline size_t inet6_if_nlmsg_size(void)
5049{
5050 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
5051 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
5052 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
5053 + nla_total_size(4) /* IFLA_MTU */
5054 + nla_total_size(4) /* IFLA_LINK */
0344338b 5055 + nla_total_size(1) /* IFLA_OPERSTATE */
b382b191 5056 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */
339bf98f 5057}
c5396a31 5058
be281e55 5059static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib,
aca05671 5060 int bytes)
7f7d9a6b
HX		 5061{
5062 int i;
aca05671 5063 int pad = bytes - sizeof(u64) * ICMP6_MIB_MAX;
7f7d9a6b
HX		 5064 BUG_ON(pad < 0);
5065
5066 /* Use put_unaligned() because stats may not be aligned for u64. */
aca05671
JH		 5067 put_unaligned(ICMP6_MIB_MAX, &stats[0]);
5068 for (i = 1; i < ICMP6_MIB_MAX; i++)
be281e55 5069 put_unaligned(atomic_long_read(&mib[i]), &stats[i]);
7f7d9a6b 5070
aca05671 5071 memset(&stats[ICMP6_MIB_MAX], 0, pad);
7f7d9a6b
HX		 5072}
5073
698365fa 5074static inline void __snmp6_fill_stats64(u64 *stats, void __percpu *mib,
a3a77372 5075 int bytes, size_t syncpoff)
4ce3c183 5076{
a3a77372
R		 5077 int i, c;
5078 u64 buff[IPSTATS_MIB_MAX];
5079 int pad = bytes - sizeof(u64) * IPSTATS_MIB_MAX;
5080
4ce3c183
ED		 5081 BUG_ON(pad < 0);
5082
a3a77372
R		 5083 memset(buff, 0, sizeof(buff));
5084 buff[0] = IPSTATS_MIB_MAX;
4ce3c183 5085
a3a77372
R		 5086 for_each_possible_cpu(c) {
5087 for (i = 1; i < IPSTATS_MIB_MAX; i++)
5088 buff[i] += snmp_get_cpu_field64(mib, c, i, syncpoff);
5089 }
5090
5091 memcpy(stats, buff, IPSTATS_MIB_MAX * sizeof(u64));
5092 memset(&stats[IPSTATS_MIB_MAX], 0, pad);
4ce3c183
ED		 5093}
5094
7f7d9a6b
HX		 5095static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
5096 int bytes)
5097{
e21e8467 5098 switch (attrtype) {
7f7d9a6b 5099 case IFLA_INET6_STATS:
a3a77372
R		 5100 __snmp6_fill_stats64(stats, idev->stats.ipv6, bytes,
5101 offsetof(struct ipstats_mib, syncp));
7f7d9a6b
HX		 5102 break;
5103 case IFLA_INET6_ICMP6STATS:
aca05671 5104 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, bytes);
7f7d9a6b
HX		 5105 break;
5106 }
5107}
5108
d5566fd7
SV		 5109static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev,
5110 u32 ext_filter_mask)
b382b191
TG		 5111{
5112 struct nlattr *nla;
5113 struct ifla_cacheinfo ci;
5114
c78679e8
DM		 5115 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags))
5116 goto nla_put_failure;
b382b191 5117 ci.max_reasm_len = IPV6_MAXPLEN;
24912420
DM		 5118 ci.tstamp = cstamp_delta(idev->tstamp);
5119 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time);
1f9248e5 5120 ci.retrans_time = jiffies_to_msecs(NEIGH_VAR(idev->nd_parms, RETRANS_TIME));
c78679e8
DM		 5121 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci))
5122 goto nla_put_failure;
b382b191 5123 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
63159f29 5124 if (!nla)
b382b191
TG		 5125 goto nla_put_failure;
5126 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
5127
5128 /* XXX - MC not implemented */
5129
d5566fd7
SV		 5130 if (ext_filter_mask & RTEXT_FILTER_SKIP_STATS)
5131 return 0;
5132
b382b191 5133 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
63159f29 5134 if (!nla)
b382b191
TG		 5135 goto nla_put_failure;
5136 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
5137
5138 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
63159f29 5139 if (!nla)
b382b191
TG		 5140 goto nla_put_failure;
5141 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
5142
f53adae4 5143 nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr));
63159f29 5144 if (!nla)
f53adae4 5145 goto nla_put_failure;
bc91b0f0 5146
d35a00b8 5147 if (nla_put_u8(skb, IFLA_INET6_ADDR_GEN_MODE, idev->cnf.addr_gen_mode))
bc91b0f0
JP		 5148 goto nla_put_failure;
5149
f53adae4
DB		 5150 read_lock_bh(&idev->lock);
5151 memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla));
5152 read_unlock_bh(&idev->lock);
5153
b382b191
TG		 5154 return 0;
5155
5156nla_put_failure:
5157 return -EMSGSIZE;
5158}
5159
b1974ed0
AR		 5160static size_t inet6_get_link_af_size(const struct net_device *dev,
5161 u32 ext_filter_mask)
b382b191
TG		 5162{
5163 if (!__in6_dev_get(dev))
5164 return 0;
5165
5166 return inet6_ifla6_size();
5167}
5168
d5566fd7
SV		 5169static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev,
5170 u32 ext_filter_mask)
b382b191
TG		 5171{
5172 struct inet6_dev *idev = __in6_dev_get(dev);
5173
5174 if (!idev)
5175 return -ENODATA;
5176
d5566fd7 5177 if (inet6_fill_ifla6_attrs(skb, idev, ext_filter_mask) < 0)
b382b191
TG		 5178 return -EMSGSIZE;
5179
5180 return 0;
5181}
5182
f53adae4
DB		 5183static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token)
5184{
f53adae4
DB		 5185 struct inet6_ifaddr *ifp;
5186 struct net_device *dev = idev->dev;
47e27d5e 5187 bool clear_token, update_rs = false;
dc848292 5188 struct in6_addr ll_addr;
f53adae4 5189
c15b1cca
HFS		 5190 ASSERT_RTNL();
5191
63159f29 5192 if (!token)
f53adae4 5193 return -EINVAL;
f53adae4
DB		 5194 if (dev->flags & (IFF_LOOPBACK | IFF_NOARP))
5195 return -EINVAL;
f53adae4
DB		 5196 if (!ipv6_accept_ra(idev))
5197 return -EINVAL;
bd11f074 5198 if (idev->cnf.rtr_solicits == 0)
f53adae4
DB		 5199 return -EINVAL;
5200
5201 write_lock_bh(&idev->lock);
5202
5203 BUILD_BUG_ON(sizeof(token->s6_addr) != 16);
5204 memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8);
5205
5206 write_unlock_bh(&idev->lock);
5207
47e27d5e
DB		 5208 clear_token = ipv6_addr_any(token);
5209 if (clear_token)
5210 goto update_lft;
5211
dc848292
HFS		 5212 if (!idev->dead && (idev->if_flags & IF_READY) &&
5213 !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE |
5214 IFA_F_OPTIMISTIC)) {
fc403832
DB		 5215 /* If we're not ready, then normal ifup will take care
5216 * of this. Otherwise, we need to request our rs here.
5217 */
5218 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters);
5219 update_rs = true;
5220 }
f53adae4 5221
47e27d5e 5222update_lft:
f53adae4 5223 write_lock_bh(&idev->lock);
fc403832 5224
77ecaace 5225 if (update_rs) {
fc403832 5226 idev->if_flags |= IF_RS_SENT;
bd11f074
MŻ		 5227 idev->rs_interval = rfc3315_s14_backoff_init(
5228 idev->cnf.rtr_solicit_interval);
77ecaace 5229 idev->rs_probes = 1;
bd11f074 5230 addrconf_mod_rs_timer(idev, idev->rs_interval);
77ecaace 5231 }
f53adae4
DB		 5232
5233 /* Well, that's kinda nasty ... */
5234 list_for_each_entry(ifp, &idev->addr_list, if_list) {
5235 spin_lock(&ifp->lock);
617fe29d 5236 if (ifp->tokenized) {
f53adae4
DB		 5237 ifp->valid_lft = 0;
5238 ifp->prefered_lft = 0;
5239 }
5240 spin_unlock(&ifp->lock);
5241 }
5242
5243 write_unlock_bh(&idev->lock);
b2ed64a9 5244 inet6_ifinfo_notify(RTM_NEWLINK, idev);
c15b1cca 5245 addrconf_verify_rtnl();
f53adae4
DB		 5246 return 0;
5247}
5248
11b1f828
DB		 5249static const struct nla_policy inet6_af_policy[IFLA_INET6_MAX + 1] = {
5250 [IFLA_INET6_ADDR_GEN_MODE] = { .type = NLA_U8 },
5251 [IFLA_INET6_TOKEN] = { .len = sizeof(struct in6_addr) },
5252};
5253
5254static int inet6_validate_link_af(const struct net_device *dev,
5255 const struct nlattr *nla)
5256{
5257 struct nlattr *tb[IFLA_INET6_MAX + 1];
5258
5259 if (dev && !__in6_dev_get(dev))
5260 return -EAFNOSUPPORT;
5261
fceb6435
JB		 5262 return nla_parse_nested(tb, IFLA_INET6_MAX, nla, inet6_af_policy,
5263 NULL);
11b1f828
DB		 5264}
5265
d35a00b8
FJ		 5266static int check_addr_gen_mode(int mode)
5267{
5268 if (mode != IN6_ADDR_GEN_MODE_EUI64 &&
5269 mode != IN6_ADDR_GEN_MODE_NONE &&
5270 mode != IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
5271 mode != IN6_ADDR_GEN_MODE_RANDOM)
5272 return -EINVAL;
5273 return 1;
5274}
5275
5276static int check_stable_privacy(struct inet6_dev *idev, struct net *net,
5277 int mode)
5278{
5279 if (mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
5280 !idev->cnf.stable_secret.initialized &&
5281 !net->ipv6.devconf_dflt->stable_secret.initialized)
5282 return -EINVAL;
5283 return 1;
5284}
5285
f53adae4
DB		 5286static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla)
5287{
5288 int err = -EINVAL;
5289 struct inet6_dev *idev = __in6_dev_get(dev);
5290 struct nlattr *tb[IFLA_INET6_MAX + 1];
5291
5292 if (!idev)
5293 return -EAFNOSUPPORT;
5294
fceb6435 5295 if (nla_parse_nested(tb, IFLA_INET6_MAX, nla, NULL, NULL) < 0)
f53adae4
DB		 5296 BUG();
5297
bc91b0f0 5298 if (tb[IFLA_INET6_TOKEN]) {
f53adae4 5299 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN]));
bc91b0f0
JP		 5300 if (err)
5301 return err;
5302 }
5303
5304 if (tb[IFLA_INET6_ADDR_GEN_MODE]) {
5305 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]);
5306
d35a00b8
FJ		 5307 if (check_addr_gen_mode(mode) < 0 ||
5308 check_stable_privacy(idev, dev_net(dev), mode) < 0)
bc91b0f0 5309 return -EINVAL;
622c81d5 5310
d35a00b8 5311 idev->cnf.addr_gen_mode = mode;
bc91b0f0
JP		 5312 err = 0;
5313 }
f53adae4
DB		 5314
5315 return err;
5316}
5317
1ab1457c 5318static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
15e47304 5319 u32 portid, u32 seq, int event, unsigned int flags)
1da177e4 5320{
04561c1f 5321 struct net_device *dev = idev->dev;
04561c1f
TG		 5322 struct ifinfomsg *hdr;
5323 struct nlmsghdr *nlh;
5324 void *protoinfo;
04561c1f 5325
15e47304 5326 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags);
63159f29 5327 if (!nlh)
26932566 5328 return -EMSGSIZE;
04561c1f
TG		 5329
5330 hdr = nlmsg_data(nlh);
5331 hdr->ifi_family = AF_INET6;
5332 hdr->__ifi_pad = 0;
5333 hdr->ifi_type = dev->type;
5334 hdr->ifi_index = dev->ifindex;
5335 hdr->ifi_flags = dev_get_flags(dev);
5336 hdr->ifi_change = 0;
5337
c78679e8
DM		 5338 if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
5339 (dev->addr_len &&
5340 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
5341 nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
a54acb3a 5342 (dev->ifindex != dev_get_iflink(dev) &&
0344338b
AG		 5343 nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))) ||
5344 nla_put_u8(skb, IFLA_OPERSTATE,
5345 netif_running(dev) ? dev->operstate : IF_OPER_DOWN))
c78679e8 5346 goto nla_put_failure;
04561c1f 5347 protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
63159f29 5348 if (!protoinfo)
04561c1f 5349 goto nla_put_failure;
1da177e4 5350
d5566fd7 5351 if (inet6_fill_ifla6_attrs(skb, idev, 0) < 0)
bf99f1bd 5352 goto nla_put_failure;
1da177e4 5353
04561c1f 5354 nla_nest_end(skb, protoinfo);
053c095a
JB		 5355 nlmsg_end(skb, nlh);
5356 return 0;
1da177e4 5357
04561c1f 5358nla_put_failure:
26932566
PM		 5359 nlmsg_cancel(skb, nlh);
5360 return -EMSGSIZE;
1da177e4
LT		 5361}
5362
5363static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
5364{
3b1e0a65 5365 struct net *net = sock_net(skb->sk);
84d2697d 5366 int h, s_h;
434a8a58 5367 int idx = 0, s_idx;
1da177e4
LT		 5368 struct net_device *dev;
5369 struct inet6_dev *idev;
84d2697d 5370 struct hlist_head *head;
1da177e4 5371
84d2697d
ED		 5372 s_h = cb->args[0];
5373 s_idx = cb->args[1];
5374
5375 rcu_read_lock();
5376 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
5377 idx = 0;
5378 head = &net->dev_index_head[h];
b67bfe0d 5379 hlist_for_each_entry_rcu(dev, head, index_hlist) {
84d2697d
ED		 5380 if (idx < s_idx)
5381 goto cont;
5382 idev = __in6_dev_get(dev);
5383 if (!idev)
5384 goto cont;
5385 if (inet6_fill_ifinfo(skb, idev,
15e47304 5386 NETLINK_CB(cb->skb).portid,
84d2697d 5387 cb->nlh->nlmsg_seq,
053c095a 5388 RTM_NEWLINK, NLM_F_MULTI) < 0)
84d2697d 5389 goto out;
7562f876 5390cont:
84d2697d
ED		 5391 idx++;
5392 }
1da177e4 5393 }
84d2697d
ED		 5394out:
5395 rcu_read_unlock();
5396 cb->args[1] = idx;
5397 cb->args[0] = h;
1da177e4
LT		 5398
5399 return skb->len;
5400}
5401
5402void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
5403{
5404 struct sk_buff *skb;
c346dca1 5405 struct net *net = dev_net(idev->dev);
8d7a76c9 5406 int err = -ENOBUFS;
1ab1457c 5407
339bf98f 5408 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
63159f29 5409 if (!skb)
8d7a76c9
TG		 5410 goto errout;
5411
5412 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
26932566
PM		 5413 if (err < 0) {
5414 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
5415 WARN_ON(err == -EMSGSIZE);
5416 kfree_skb(skb);
5417 goto errout;
5418 }
5f75a104 5419 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC);
1ce85fe4 5420 return;
8d7a76c9
TG		 5421errout:
5422 if (err < 0)
5f75a104 5423 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err);
1da177e4
LT		 5424}
5425
339bf98f
TG		 5426static inline size_t inet6_prefix_nlmsg_size(void)
5427{
5428 return NLMSG_ALIGN(sizeof(struct prefixmsg))
5429 + nla_total_size(sizeof(struct in6_addr))
5430 + nla_total_size(sizeof(struct prefix_cacheinfo));
5431}
c5396a31 5432
1da177e4 5433static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
15e47304 5434 struct prefix_info *pinfo, u32 portid, u32 seq,
6051e2f4 5435 int event, unsigned int flags)
1da177e4 5436{
6051e2f4
TG		 5437 struct prefixmsg *pmsg;
5438 struct nlmsghdr *nlh;
1da177e4
LT		 5439 struct prefix_cacheinfo ci;
5440
15e47304 5441 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags);
63159f29 5442 if (!nlh)
26932566 5443 return -EMSGSIZE;
6051e2f4
TG		 5444
5445 pmsg = nlmsg_data(nlh);
1da177e4 5446 pmsg->prefix_family = AF_INET6;
8a47077a
PM		 5447 pmsg->prefix_pad1 = 0;
5448 pmsg->prefix_pad2 = 0;
1da177e4
LT		 5449 pmsg->prefix_ifindex = idev->dev->ifindex;
5450 pmsg->prefix_len = pinfo->prefix_len;
5451 pmsg->prefix_type = pinfo->type;
8a47077a 5452 pmsg->prefix_pad3 = 0;
1da177e4
LT		 5453 pmsg->prefix_flags = 0;
5454 if (pinfo->onlink)
5455 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
5456 if (pinfo->autoconf)
5457 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
5458
c78679e8
DM		 5459 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix))
5460 goto nla_put_failure;
1da177e4
LT		 5461 ci.preferred_time = ntohl(pinfo->prefered);
5462 ci.valid_time = ntohl(pinfo->valid);
c78679e8
DM		 5463 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci))
5464 goto nla_put_failure;
053c095a
JB		 5465 nlmsg_end(skb, nlh);
5466 return 0;
1da177e4 5467
6051e2f4 5468nla_put_failure:
26932566
PM		 5469 nlmsg_cancel(skb, nlh);
5470 return -EMSGSIZE;
1da177e4
LT		 5471}
5472
1ab1457c 5473static void inet6_prefix_notify(int event, struct inet6_dev *idev,
1da177e4
LT		 5474 struct prefix_info *pinfo)
5475{
5476 struct sk_buff *skb;
c346dca1 5477 struct net *net = dev_net(idev->dev);
8c384bfa 5478 int err = -ENOBUFS;
1da177e4 5479
339bf98f 5480 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
63159f29 5481 if (!skb)
8c384bfa
TG		 5482 goto errout;
5483
5484 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
26932566
PM		 5485 if (err < 0) {
5486 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
5487 WARN_ON(err == -EMSGSIZE);
5488 kfree_skb(skb);
5489 goto errout;
5490 }
1ce85fe4
PNA		 5491 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
5492 return;
8c384bfa
TG		 5493errout:
5494 if (err < 0)
6fda7350 5495 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
1da177e4
LT		 5496}
5497
1da177e4
LT		 5498static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
5499{
63998ac2
ND		 5500 struct net *net = dev_net(ifp->idev->dev);
5501
c15b1cca
HFS		 5502 if (event)
5503 ASSERT_RTNL();
5504
1da177e4
LT		 5505 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
5506
5507 switch (event) {
5508 case RTM_NEWADDR:
95c385b4
NH		 5509 /*
5510 * If the address was optimistic
5511 * we inserted the route at the start of
5512 * our DAD process, so we don't need
5513 * to do it again
5514 */
4e587ea7 5515 if (!rcu_access_pointer(ifp->rt->rt6i_node))
95c385b4 5516 ip6_ins_rt(ifp->rt);
1da177e4
LT		 5517 if (ifp->idev->cnf.forwarding)
5518 addrconf_join_anycast(ifp);
7996c799 5519 if (!ipv6_addr_any(&ifp->peer_addr))
caeaba79
ND		 5520 addrconf_prefix_route(&ifp->peer_addr, 128,
5521 ifp->idev->dev, 0, 0);
1da177e4
LT		 5522 break;
5523 case RTM_DELADDR:
5524 if (ifp->idev->cnf.forwarding)
5525 addrconf_leave_anycast(ifp);
5526 addrconf_leave_solict(ifp->idev, &ifp->addr);
7996c799 5527 if (!ipv6_addr_any(&ifp->peer_addr)) {
caeaba79 5528 struct rt6_info *rt;
caeaba79 5529
e7478dfc
ND		 5530 rt = addrconf_get_prefix_route(&ifp->peer_addr, 128,
5531 ifp->idev->dev, 0, 0);
8e3d5be7
MKL		 5532 if (rt)
5533 ip6_del_rt(rt);
caeaba79 5534 }
38bd10c4 5535 if (ifp->rt) {
ad65a2f0
WW		 5536 if (dst_hold_safe(&ifp->rt->dst))
5537 ip6_del_rt(ifp->rt);
38bd10c4 5538 }
705f1c86 5539 rt_genid_bump_ipv6(net);
1da177e4
LT		 5540 break;
5541 }
63998ac2 5542 atomic_inc(&net->ipv6.dev_addr_genid);
1da177e4
LT		 5543}
5544
5545static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
5546{
8814c4b5 5547 rcu_read_lock_bh();
1da177e4
LT		 5548 if (likely(ifp->idev->dead == 0))
5549 __ipv6_ifa_notify(event, ifp);
8814c4b5 5550 rcu_read_unlock_bh();
1da177e4
LT		 5551}
5552
5553#ifdef CONFIG_SYSCTL
5554
5555static
fe2c6338 5556int addrconf_sysctl_forward(struct ctl_table *ctl, int write,
1da177e4
LT		 5557 void __user *buffer, size_t *lenp, loff_t *ppos)
5558{
5559 int *valp = ctl->data;
5560 int val = *valp;
88af182e 5561 loff_t pos = *ppos;
fe2c6338 5562 struct ctl_table lctl;
1da177e4
LT		 5563 int ret;
5564
013d97e9
FR		 5565 /*
5566 * ctl->data points to idev->cnf.forwarding, we should
5567 * not modify it until we get the rtnl lock.
5568 */
5569 lctl = *ctl;
5570 lctl.data = &val;
5571
5572 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
1da177e4 5573
c8fecf22 5574 if (write)
b325fddb 5575 ret = addrconf_fixup_forwarding(ctl, valp, val);
88af182e
EB		 5576 if (ret)
5577 *ppos = pos;
1ab1457c 5578 return ret;
1da177e4
LT		 5579}
5580
77751427
ML		 5581static
5582int addrconf_sysctl_mtu(struct ctl_table *ctl, int write,
5583 void __user *buffer, size_t *lenp, loff_t *ppos)
5584{
5585 struct inet6_dev *idev = ctl->extra1;
5586 int min_mtu = IPV6_MIN_MTU;
5587 struct ctl_table lctl;
5588
5589 lctl = *ctl;
5590 lctl.extra1 = &min_mtu;
5591 lctl.extra2 = idev ? &idev->dev->mtu : NULL;
5592
5593 return proc_dointvec_minmax(&lctl, write, buffer, lenp, ppos);
5594}
5595
56d417b1
BH		 5596static void dev_disable_change(struct inet6_dev *idev)
5597{
75538c2b
CW		 5598 struct netdev_notifier_info info;
5599
56d417b1
BH		 5600 if (!idev || !idev->dev)
5601 return;
5602
75538c2b 5603 netdev_notifier_info_init(&info, idev->dev);
56d417b1 5604 if (idev->cnf.disable_ipv6)
75538c2b 5605 addrconf_notify(NULL, NETDEV_DOWN, &info);
56d417b1 5606 else
75538c2b 5607 addrconf_notify(NULL, NETDEV_UP, &info);
56d417b1
BH		 5608}
5609
5610static void addrconf_disable_change(struct net *net, __s32 newf)
5611{
5612 struct net_device *dev;
5613 struct inet6_dev *idev;
5614
03e4deff 5615 for_each_netdev(net, dev) {
56d417b1
BH		 5616 idev = __in6_dev_get(dev);
5617 if (idev) {
5618 int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
5619 idev->cnf.disable_ipv6 = newf;
5620 if (changed)
5621 dev_disable_change(idev);
5622 }
56d417b1 5623 }
56d417b1
BH		 5624}
5625
013d97e9 5626static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf)
56d417b1
BH		 5627{
5628 struct net *net;
013d97e9
FR		 5629 int old;
5630
5631 if (!rtnl_trylock())
5632 return restart_syscall();
56d417b1
BH		 5633
5634 net = (struct net *)table->extra2;
013d97e9
FR		 5635 old = *p;
5636 *p = newf;
56d417b1 5637
013d97e9
FR		 5638 if (p == &net->ipv6.devconf_dflt->disable_ipv6) {
5639 rtnl_unlock();
56d417b1 5640 return 0;
88af182e 5641 }
56d417b1
BH		 5642
5643 if (p == &net->ipv6.devconf_all->disable_ipv6) {
56d417b1
BH		 5644 net->ipv6.devconf_dflt->disable_ipv6 = newf;
5645 addrconf_disable_change(net, newf);
013d97e9 5646 } else if ((!newf) ^ (!old))
56d417b1
BH		 5647 dev_disable_change((struct inet6_dev *)table->extra1);
5648
5649 rtnl_unlock();
5650 return 0;
5651}
5652
5653static
fe2c6338 5654int addrconf_sysctl_disable(struct ctl_table *ctl, int write,
56d417b1
BH		 5655 void __user *buffer, size_t *lenp, loff_t *ppos)
5656{
5657 int *valp = ctl->data;
5658 int val = *valp;
88af182e 5659 loff_t pos = *ppos;
fe2c6338 5660 struct ctl_table lctl;
56d417b1
BH		 5661 int ret;
5662
013d97e9
FR		 5663 /*
5664 * ctl->data points to idev->cnf.disable_ipv6, we should
5665 * not modify it until we get the rtnl lock.
5666 */
5667 lctl = *ctl;
5668 lctl.data = &val;
5669
5670 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
56d417b1
BH		 5671
5672 if (write)
5673 ret = addrconf_disable_ipv6(ctl, valp, val);
88af182e
EB		 5674 if (ret)
5675 *ppos = pos;
56d417b1
BH		 5676 return ret;
5677}
5678
c92d5491 5679static
5680int addrconf_sysctl_proxy_ndp(struct ctl_table *ctl, int write,
5681 void __user *buffer, size_t *lenp, loff_t *ppos)
5682{
5683 int *valp = ctl->data;
5684 int ret;
5685 int old, new;
5686
5687 old = *valp;
5688 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
5689 new = *valp;
5690
5691 if (write && old != new) {
5692 struct net *net = ctl->extra2;
5693
5694 if (!rtnl_trylock())
5695 return restart_syscall();
5696
5697 if (valp == &net->ipv6.devconf_dflt->proxy_ndp)
85b3daad
DA		 5698 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
5699 NETCONFA_PROXY_NEIGH,
c92d5491 5700 NETCONFA_IFINDEX_DEFAULT,
5701 net->ipv6.devconf_dflt);
5702 else if (valp == &net->ipv6.devconf_all->proxy_ndp)
85b3daad
DA		 5703 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
5704 NETCONFA_PROXY_NEIGH,
c92d5491 5705 NETCONFA_IFINDEX_ALL,
5706 net->ipv6.devconf_all);
5707 else {
5708 struct inet6_dev *idev = ctl->extra1;
5709
85b3daad
DA		 5710 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
5711 NETCONFA_PROXY_NEIGH,
c92d5491 5712 idev->dev->ifindex,
5713 &idev->cnf);
5714 }
5715 rtnl_unlock();
5716 }
5717
5718 return ret;
5719}
5720
d35a00b8
FJ		 5721static int addrconf_sysctl_addr_gen_mode(struct ctl_table *ctl, int write,
5722 void __user *buffer, size_t *lenp,
5723 loff_t *ppos)
5724{
5725 int ret = 0;
5726 int new_val;
5727 struct inet6_dev *idev = (struct inet6_dev *)ctl->extra1;
5728 struct net *net = (struct net *)ctl->extra2;
5729
8c171d6c
FJ		 5730 if (!rtnl_trylock())
5731 return restart_syscall();
5732
d35a00b8
FJ		 5733 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
5734
5735 if (write) {
5736 new_val = *((int *)ctl->data);
5737
8c171d6c
FJ		 5738 if (check_addr_gen_mode(new_val) < 0) {
5739 ret = -EINVAL;
5740 goto out;
5741 }
d35a00b8
FJ		 5742
5743 /* request for default */
5744 if (&net->ipv6.devconf_dflt->addr_gen_mode == ctl->data) {
5745 ipv6_devconf_dflt.addr_gen_mode = new_val;
5746
5747 /* request for individual net device */
5748 } else {
5749 if (!idev)
8c171d6c 5750 goto out;
d35a00b8 5751
8c171d6c
FJ		 5752 if (check_stable_privacy(idev, net, new_val) < 0) {
5753 ret = -EINVAL;
5754 goto out;
5755 }
d35a00b8
FJ		 5756
5757 if (idev->cnf.addr_gen_mode != new_val) {
5758 idev->cnf.addr_gen_mode = new_val;
d35a00b8 5759 addrconf_dev_config(idev->dev);
d35a00b8
FJ		 5760 }
5761 }
5762 }
5763
8c171d6c
FJ		 5764out:
5765 rtnl_unlock();
5766
d35a00b8
FJ		 5767 return ret;
5768}
5769
3d1bec99
HFS		 5770static int addrconf_sysctl_stable_secret(struct ctl_table *ctl, int write,
5771 void __user *buffer, size_t *lenp,
5772 loff_t *ppos)
5773{
5774 int err;
5775 struct in6_addr addr;
5776 char str[IPV6_MAX_STRLEN];
5777 struct ctl_table lctl = *ctl;
622c81d5 5778 struct net *net = ctl->extra2;
3d1bec99
HFS		 5779 struct ipv6_stable_secret *secret = ctl->data;
5780
622c81d5
HFS		 5781 if (&net->ipv6.devconf_all->stable_secret == ctl->data)
5782 return -EIO;
5783
3d1bec99
HFS		 5784 lctl.maxlen = IPV6_MAX_STRLEN;
5785 lctl.data = str;
5786
5787 if (!rtnl_trylock())
5788 return restart_syscall();
5789
5790 if (!write && !secret->initialized) {
5791 err = -EIO;
5792 goto out;
5793 }
5794
5449a5ca
WC		 5795 err = snprintf(str, sizeof(str), "%pI6", &secret->secret);
5796 if (err >= sizeof(str)) {
5797 err = -EIO;
5798 goto out;
3d1bec99
HFS		 5799 }
5800
5801 err = proc_dostring(&lctl, write, buffer, lenp, ppos);
5802 if (err || !write)
5803 goto out;
5804
5805 if (in6_pton(str, -1, addr.in6_u.u6_addr8, -1, NULL) != 1) {
5806 err = -EIO;
5807 goto out;
5808 }
5809
5810 secret->initialized = true;
5811 secret->secret = addr;
5812
622c81d5
HFS		 5813 if (&net->ipv6.devconf_dflt->stable_secret == ctl->data) {
5814 struct net_device *dev;
5815
5816 for_each_netdev(net, dev) {
5817 struct inet6_dev *idev = __in6_dev_get(dev);
5818
5819 if (idev) {
d35a00b8 5820 idev->cnf.addr_gen_mode =
622c81d5
HFS		 5821 IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
5822 }
5823 }
5824 } else {
5825 struct inet6_dev *idev = ctl->extra1;
5826
d35a00b8 5827 idev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
622c81d5
HFS		 5828 }
5829
3d1bec99
HFS		 5830out:
5831 rtnl_unlock();
5832
5833 return err;
5834}
c92d5491 5835
35103d11
AG		 5836static
5837int addrconf_sysctl_ignore_routes_with_linkdown(struct ctl_table *ctl,
5838 int write,
5839 void __user *buffer,
5840 size_t *lenp,
5841 loff_t *ppos)
5842{
5843 int *valp = ctl->data;
5844 int val = *valp;
5845 loff_t pos = *ppos;
5846 struct ctl_table lctl;
5847 int ret;
5848
5849 /* ctl->data points to idev->cnf.ignore_routes_when_linkdown
5850 * we should not modify it until we get the rtnl lock.
5851 */
5852 lctl = *ctl;
5853 lctl.data = &val;
5854
5855 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
5856
5857 if (write)
5858 ret = addrconf_fixup_linkdown(ctl, valp, val);
5859 if (ret)
5860 *ppos = pos;
5861 return ret;
5862}
5863
df789fe7
DF		 5864static
5865void addrconf_set_nopolicy(struct rt6_info *rt, int action)
5866{
5867 if (rt) {
5868 if (action)
5869 rt->dst.flags |= DST_NOPOLICY;
5870 else
5871 rt->dst.flags &= ~DST_NOPOLICY;
5872 }
5873}
5874
5875static
5876void addrconf_disable_policy_idev(struct inet6_dev *idev, int val)
5877{
5878 struct inet6_ifaddr *ifa;
5879
5880 read_lock_bh(&idev->lock);
5881 list_for_each_entry(ifa, &idev->addr_list, if_list) {
5882 spin_lock(&ifa->lock);
5883 if (ifa->rt) {
5884 struct rt6_info *rt = ifa->rt;
df789fe7
DF		 5885 int cpu;
5886
66f5d6ce 5887 rcu_read_lock();
df789fe7
DF		 5888 addrconf_set_nopolicy(ifa->rt, val);
5889 if (rt->rt6i_pcpu) {
5890 for_each_possible_cpu(cpu) {
5891 struct rt6_info **rtp;
5892
5893 rtp = per_cpu_ptr(rt->rt6i_pcpu, cpu);
5894 addrconf_set_nopolicy(*rtp, val);
5895 }
5896 }
66f5d6ce 5897 rcu_read_unlock();
df789fe7
DF		 5898 }
5899 spin_unlock(&ifa->lock);
5900 }
5901 read_unlock_bh(&idev->lock);
5902}
5903
5904static
5905int addrconf_disable_policy(struct ctl_table *ctl, int *valp, int val)
5906{
5907 struct inet6_dev *idev;
5908 struct net *net;
5909
5910 if (!rtnl_trylock())
5911 return restart_syscall();
5912
5913 *valp = val;
5914
5915 net = (struct net *)ctl->extra2;
5916 if (valp == &net->ipv6.devconf_dflt->disable_policy) {
5917 rtnl_unlock();
5918 return 0;
5919 }
5920
5921 if (valp == &net->ipv6.devconf_all->disable_policy) {
5922 struct net_device *dev;
5923
5924 for_each_netdev(net, dev) {
5925 idev = __in6_dev_get(dev);
5926 if (idev)
5927 addrconf_disable_policy_idev(idev, val);
5928 }
5929 } else {
5930 idev = (struct inet6_dev *)ctl->extra1;
5931 addrconf_disable_policy_idev(idev, val);
5932 }
5933
5934 rtnl_unlock();
5935 return 0;
5936}
5937
5938static
5939int addrconf_sysctl_disable_policy(struct ctl_table *ctl, int write,
5940 void __user *buffer, size_t *lenp,
5941 loff_t *ppos)
5942{
5943 int *valp = ctl->data;
5944 int val = *valp;
5945 loff_t pos = *ppos;
5946 struct ctl_table lctl;
5947 int ret;
5948
5949 lctl = *ctl;
5950 lctl.data = &val;
5951 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
5952
5953 if (write && (*valp != val))
5954 ret = addrconf_disable_policy(ctl, valp, val);
5955
5956 if (ret)
5957 *ppos = pos;
5958
5959 return ret;
5960}
5961
cb4a4c69 5962static int minus_one = -1;
cb9e684e
MŻ		 5963static const int one = 1;
5964static const int two_five_five = 255;
5965
607ea7cd 5966static const struct ctl_table addrconf_sysctl[] = {
5df1f77f
KK		 5967 {
5968 .procname = "forwarding",
5969 .data = &ipv6_devconf.forwarding,
5970 .maxlen = sizeof(int),
5971 .mode = 0644,
5972 .proc_handler = addrconf_sysctl_forward,
5973 },
5974 {
5975 .procname = "hop_limit",
5976 .data = &ipv6_devconf.hop_limit,
5977 .maxlen = sizeof(int),
5978 .mode = 0644,
cb9e684e
MŻ		 5979 .proc_handler = proc_dointvec_minmax,
5980 .extra1 = (void *)&one,
5981 .extra2 = (void *)&two_five_five,
5df1f77f
KK		 5982 },
5983 {
5984 .procname = "mtu",
5985 .data = &ipv6_devconf.mtu6,
5986 .maxlen = sizeof(int),
5987 .mode = 0644,
5988 .proc_handler = addrconf_sysctl_mtu,
5989 },
5990 {
5991 .procname = "accept_ra",
5992 .data = &ipv6_devconf.accept_ra,
5993 .maxlen = sizeof(int),
5994 .mode = 0644,
5995 .proc_handler = proc_dointvec,
5996 },
5997 {
5998 .procname = "accept_redirects",
5999 .data = &ipv6_devconf.accept_redirects,
6000 .maxlen = sizeof(int),
6001 .mode = 0644,
6002 .proc_handler = proc_dointvec,
6003 },
6004 {
6005 .procname = "autoconf",
6006 .data = &ipv6_devconf.autoconf,
6007 .maxlen = sizeof(int),
6008 .mode = 0644,
6009 .proc_handler = proc_dointvec,
6010 },
6011 {
6012 .procname = "dad_transmits",
6013 .data = &ipv6_devconf.dad_transmits,
6014 .maxlen = sizeof(int),
6015 .mode = 0644,
6016 .proc_handler = proc_dointvec,
6017 },
6018 {
6019 .procname = "router_solicitations",
6020 .data = &ipv6_devconf.rtr_solicits,
6021 .maxlen = sizeof(int),
6022 .mode = 0644,
cb4a4c69
MŻ		 6023 .proc_handler = proc_dointvec_minmax,
6024 .extra1 = &minus_one,
5df1f77f
KK		 6025 },
6026 {
6027 .procname = "router_solicitation_interval",
6028 .data = &ipv6_devconf.rtr_solicit_interval,
6029 .maxlen = sizeof(int),
6030 .mode = 0644,
6031 .proc_handler = proc_dointvec_jiffies,
6032 },
bd11f074
MŻ		 6033 {
6034 .procname = "router_solicitation_max_interval",
6035 .data = &ipv6_devconf.rtr_solicit_max_interval,
6036 .maxlen = sizeof(int),
6037 .mode = 0644,
6038 .proc_handler = proc_dointvec_jiffies,
6039 },
5df1f77f
KK		 6040 {
6041 .procname = "router_solicitation_delay",
6042 .data = &ipv6_devconf.rtr_solicit_delay,
6043 .maxlen = sizeof(int),
6044 .mode = 0644,
6045 .proc_handler = proc_dointvec_jiffies,
6046 },
6047 {
6048 .procname = "force_mld_version",
6049 .data = &ipv6_devconf.force_mld_version,
6050 .maxlen = sizeof(int),
6051 .mode = 0644,
6052 .proc_handler = proc_dointvec,
6053 },
6054 {
6055 .procname = "mldv1_unsolicited_report_interval",
6056 .data =
6057 &ipv6_devconf.mldv1_unsolicited_report_interval,
6058 .maxlen = sizeof(int),
6059 .mode = 0644,
6060 .proc_handler = proc_dointvec_ms_jiffies,
6061 },
6062 {
6063 .procname = "mldv2_unsolicited_report_interval",
6064 .data =
6065 &ipv6_devconf.mldv2_unsolicited_report_interval,
6066 .maxlen = sizeof(int),
6067 .mode = 0644,
6068 .proc_handler = proc_dointvec_ms_jiffies,
6069 },
6070 {
6071 .procname = "use_tempaddr",
6072 .data = &ipv6_devconf.use_tempaddr,
6073 .maxlen = sizeof(int),
6074 .mode = 0644,
6075 .proc_handler = proc_dointvec,
6076 },
6077 {
6078 .procname = "temp_valid_lft",
6079 .data = &ipv6_devconf.temp_valid_lft,
6080 .maxlen = sizeof(int),
6081 .mode = 0644,
6082 .proc_handler = proc_dointvec,
6083 },
6084 {
6085 .procname = "temp_prefered_lft",
6086 .data = &ipv6_devconf.temp_prefered_lft,
6087 .maxlen = sizeof(int),
6088 .mode = 0644,
6089 .proc_handler = proc_dointvec,
6090 },
6091 {
6092 .procname = "regen_max_retry",
6093 .data = &ipv6_devconf.regen_max_retry,
6094 .maxlen = sizeof(int),
6095 .mode = 0644,
6096 .proc_handler = proc_dointvec,
6097 },
6098 {
6099 .procname = "max_desync_factor",
6100 .data = &ipv6_devconf.max_desync_factor,
6101 .maxlen = sizeof(int),
6102 .mode = 0644,
6103 .proc_handler = proc_dointvec,
6104 },
6105 {
6106 .procname = "max_addresses",
6107 .data = &ipv6_devconf.max_addresses,
6108 .maxlen = sizeof(int),
6109 .mode = 0644,
6110 .proc_handler = proc_dointvec,
6111 },
6112 {
6113 .procname = "accept_ra_defrtr",
6114 .data = &ipv6_devconf.accept_ra_defrtr,
6115 .maxlen = sizeof(int),
6116 .mode = 0644,
6117 .proc_handler = proc_dointvec,
6118 },
6119 {
6120 .procname = "accept_ra_min_hop_limit",
6121 .data = &ipv6_devconf.accept_ra_min_hop_limit,
6122 .maxlen = sizeof(int),
6123 .mode = 0644,
6124 .proc_handler = proc_dointvec,
6125 },
6126 {
6127 .procname = "accept_ra_pinfo",
6128 .data = &ipv6_devconf.accept_ra_pinfo,
6129 .maxlen = sizeof(int),
6130 .mode = 0644,
6131 .proc_handler = proc_dointvec,
6132 },
930d6ff2 6133#ifdef CONFIG_IPV6_ROUTER_PREF
5df1f77f
KK		 6134 {
6135 .procname = "accept_ra_rtr_pref",
6136 .data = &ipv6_devconf.accept_ra_rtr_pref,
6137 .maxlen = sizeof(int),
6138 .mode = 0644,
6139 .proc_handler = proc_dointvec,
6140 },
6141 {
6142 .procname = "router_probe_interval",
6143 .data = &ipv6_devconf.rtr_probe_interval,
6144 .maxlen = sizeof(int),
6145 .mode = 0644,
6146 .proc_handler = proc_dointvec_jiffies,
6147 },
fa03ef38 6148#ifdef CONFIG_IPV6_ROUTE_INFO
bbea124b
JS		 6149 {
6150 .procname = "accept_ra_rt_info_min_plen",
6151 .data = &ipv6_devconf.accept_ra_rt_info_min_plen,
6152 .maxlen = sizeof(int),
6153 .mode = 0644,
6154 .proc_handler = proc_dointvec,
6155 },
5df1f77f
KK		 6156 {
6157 .procname = "accept_ra_rt_info_max_plen",
6158 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
6159 .maxlen = sizeof(int),
6160 .mode = 0644,
6161 .proc_handler = proc_dointvec,
6162 },
09c884d4 6163#endif
930d6ff2 6164#endif
5df1f77f
KK		 6165 {
6166 .procname = "proxy_ndp",
6167 .data = &ipv6_devconf.proxy_ndp,
6168 .maxlen = sizeof(int),
6169 .mode = 0644,
6170 .proc_handler = addrconf_sysctl_proxy_ndp,
6171 },
6172 {
6173 .procname = "accept_source_route",
6174 .data = &ipv6_devconf.accept_source_route,
6175 .maxlen = sizeof(int),
6176 .mode = 0644,
6177 .proc_handler = proc_dointvec,
6178 },
95c385b4 6179#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
5df1f77f
KK		 6180 {
6181 .procname = "optimistic_dad",
6182 .data = &ipv6_devconf.optimistic_dad,
6183 .maxlen = sizeof(int),
6184 .mode = 0644,
6185 .proc_handler = proc_dointvec,
6186 },
6187 {
6188 .procname = "use_optimistic",
6189 .data = &ipv6_devconf.use_optimistic,
6190 .maxlen = sizeof(int),
6191 .mode = 0644,
6192 .proc_handler = proc_dointvec,
6193 },
7bc570c8
YH		 6194#endif
6195#ifdef CONFIG_IPV6_MROUTE
5df1f77f
KK		 6196 {
6197 .procname = "mc_forwarding",
6198 .data = &ipv6_devconf.mc_forwarding,
6199 .maxlen = sizeof(int),
6200 .mode = 0444,
6201 .proc_handler = proc_dointvec,
6202 },
95c385b4 6203#endif
5df1f77f
KK		 6204 {
6205 .procname = "disable_ipv6",
6206 .data = &ipv6_devconf.disable_ipv6,
6207 .maxlen = sizeof(int),
6208 .mode = 0644,
6209 .proc_handler = addrconf_sysctl_disable,
6210 },
6211 {
6212 .procname = "accept_dad",
6213 .data = &ipv6_devconf.accept_dad,
6214 .maxlen = sizeof(int),
6215 .mode = 0644,
6216 .proc_handler = proc_dointvec,
6217 },
6218 {
6219 .procname = "force_tllao",
6220 .data = &ipv6_devconf.force_tllao,
6221 .maxlen = sizeof(int),
6222 .mode = 0644,
6223 .proc_handler = proc_dointvec
6224 },
6225 {
6226 .procname = "ndisc_notify",
6227 .data = &ipv6_devconf.ndisc_notify,
6228 .maxlen = sizeof(int),
6229 .mode = 0644,
6230 .proc_handler = proc_dointvec
6231 },
6232 {
6233 .procname = "suppress_frag_ndisc",
6234 .data = &ipv6_devconf.suppress_frag_ndisc,
6235 .maxlen = sizeof(int),
6236 .mode = 0644,
6237 .proc_handler = proc_dointvec
6238 },
6239 {
6240 .procname = "accept_ra_from_local",
6241 .data = &ipv6_devconf.accept_ra_from_local,
6242 .maxlen = sizeof(int),
6243 .mode = 0644,
6244 .proc_handler = proc_dointvec,
6245 },
6246 {
6247 .procname = "accept_ra_mtu",
6248 .data = &ipv6_devconf.accept_ra_mtu,
6249 .maxlen = sizeof(int),
6250 .mode = 0644,
6251 .proc_handler = proc_dointvec,
6252 },
6253 {
6254 .procname = "stable_secret",
6255 .data = &ipv6_devconf.stable_secret,
6256 .maxlen = IPV6_MAX_STRLEN,
6257 .mode = 0600,
6258 .proc_handler = addrconf_sysctl_stable_secret,
6259 },
6260 {
6261 .procname = "use_oif_addrs_only",
6262 .data = &ipv6_devconf.use_oif_addrs_only,
6263 .maxlen = sizeof(int),
6264 .mode = 0644,
6265 .proc_handler = proc_dointvec,
6266 },
6267 {
6268 .procname = "ignore_routes_with_linkdown",
6269 .data = &ipv6_devconf.ignore_routes_with_linkdown,
6270 .maxlen = sizeof(int),
6271 .mode = 0644,
6272 .proc_handler = addrconf_sysctl_ignore_routes_with_linkdown,
6273 },
6274 {
6275 .procname = "drop_unicast_in_l2_multicast",
6276 .data = &ipv6_devconf.drop_unicast_in_l2_multicast,
6277 .maxlen = sizeof(int),
6278 .mode = 0644,
6279 .proc_handler = proc_dointvec,
6280 },
6281 {
6282 .procname = "drop_unsolicited_na",
6283 .data = &ipv6_devconf.drop_unsolicited_na,
6284 .maxlen = sizeof(int),
6285 .mode = 0644,
6286 .proc_handler = proc_dointvec,
6287 },
6288 {
6289 .procname = "keep_addr_on_down",
6290 .data = &ipv6_devconf.keep_addr_on_down,
6291 .maxlen = sizeof(int),
6292 .mode = 0644,
6293 .proc_handler = proc_dointvec,
6294
6295 },
1ababeba
DL		 6296 {
6297 .procname = "seg6_enabled",
6298 .data = &ipv6_devconf.seg6_enabled,
6299 .maxlen = sizeof(int),
6300 .mode = 0644,
6301 .proc_handler = proc_dointvec,
6302 },
bf355b8d
DL		 6303#ifdef CONFIG_IPV6_SEG6_HMAC
6304 {
6305 .procname = "seg6_require_hmac",
6306 .data = &ipv6_devconf.seg6_require_hmac,
6307 .maxlen = sizeof(int),
6308 .mode = 0644,
6309 .proc_handler = proc_dointvec,
6310 },
6311#endif
adc176c5
EN		 6312 {
6313 .procname = "enhanced_dad",
6314 .data = &ipv6_devconf.enhanced_dad,
6315 .maxlen = sizeof(int),
6316 .mode = 0644,
6317 .proc_handler = proc_dointvec,
6318 },
d35a00b8
FJ		 6319 {
6320 .procname = "addr_gen_mode",
6321 .data = &ipv6_devconf.addr_gen_mode,
6322 .maxlen = sizeof(int),
6323 .mode = 0644,
6324 .proc_handler = addrconf_sysctl_addr_gen_mode,
6325 },
df789fe7
DF		 6326 {
6327 .procname = "disable_policy",
6328 .data = &ipv6_devconf.disable_policy,
6329 .maxlen = sizeof(int),
6330 .mode = 0644,
6331 .proc_handler = addrconf_sysctl_disable_policy,
6332 },
5df1f77f
KK		 6333 {
6334 /* sentinel */
6335 }
1da177e4
LT		 6336};
6337
bff16c2f 6338static int __addrconf_sysctl_register(struct net *net, char *dev_name,
f8572d8f 6339 struct inet6_dev *idev, struct ipv6_devconf *p)
1da177e4 6340{
29c994e3 6341 int i, ifindex;
607ea7cd 6342 struct ctl_table *table;
6105e293 6343 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ];
1dab6222 6344
607ea7cd
KK		 6345 table = kmemdup(addrconf_sysctl, sizeof(addrconf_sysctl), GFP_KERNEL);
6346 if (!table)
f68635e6
PE		 6347 goto out;
6348
607ea7cd
KK		 6349 for (i = 0; table[i].data; i++) {
6350 table[i].data += (char *)p - (char *)&ipv6_devconf;
cb9e684e
MŻ		 6351 /* If one of these is already set, then it is not safe to
6352 * overwrite either of them: this makes proc_dointvec_minmax
6353 * usable.
6354 */
6355 if (!table[i].extra1 && !table[i].extra2) {
6356 table[i].extra1 = idev; /* embedded; no ref */
6357 table[i].extra2 = net;
6358 }
1da177e4 6359 }
1da177e4 6360
6105e293 6361 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name);
1da177e4 6362
607ea7cd
KK		 6363 p->sysctl_header = register_net_sysctl(net, path, table);
6364 if (!p->sysctl_header)
6105e293 6365 goto free;
f68635e6 6366
29c994e3
ND		 6367 if (!strcmp(dev_name, "all"))
6368 ifindex = NETCONFA_IFINDEX_ALL;
6369 else if (!strcmp(dev_name, "default"))
6370 ifindex = NETCONFA_IFINDEX_DEFAULT;
6371 else
6372 ifindex = idev->dev->ifindex;
85b3daad
DA		 6373 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, NETCONFA_ALL,
6374 ifindex, p);
95897312 6375 return 0;
1da177e4 6376
f68635e6 6377free:
607ea7cd 6378 kfree(table);
f68635e6 6379out:
95897312 6380 return -ENOBUFS;
1da177e4
LT		 6381}
6382
23452170
DA		 6383static void __addrconf_sysctl_unregister(struct net *net,
6384 struct ipv6_devconf *p, int ifindex)
408c4768 6385{
607ea7cd 6386 struct ctl_table *table;
408c4768 6387
607ea7cd 6388 if (!p->sysctl_header)
408c4768
PE		 6389 return;
6390
607ea7cd
KK		 6391 table = p->sysctl_header->ctl_table_arg;
6392 unregister_net_sysctl_table(p->sysctl_header);
6393 p->sysctl_header = NULL;
6394 kfree(table);
23452170
DA		 6395
6396 inet6_netconf_notify_devconf(net, RTM_DELNETCONF, 0, ifindex, NULL);
408c4768
PE		 6397}
6398
a317a2f1 6399static int addrconf_sysctl_register(struct inet6_dev *idev)
f52295a9 6400{
a317a2f1
WC		 6401 int err;
6402
6403 if (!sysctl_dev_name_is_allowed(idev->dev->name))
6404 return -EINVAL;
6405
6406 err = neigh_sysctl_register(idev->dev, idev->nd_parms,
6407 &ndisc_ifinfo_sysctl_change);
6408 if (err)
6409 return err;
6410 err = __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
6411 idev, &idev->cnf);
6412 if (err)
6413 neigh_sysctl_unregister(idev->nd_parms);
6414
6415 return err;
f52295a9
PE		 6416}
6417
408c4768 6418static void addrconf_sysctl_unregister(struct inet6_dev *idev)
1da177e4 6419{
23452170
DA		 6420 __addrconf_sysctl_unregister(dev_net(idev->dev), &idev->cnf,
6421 idev->dev->ifindex);
408c4768 6422 neigh_sysctl_unregister(idev->nd_parms);
1da177e4
LT		 6423}
6424
6425
6426#endif
6427
2c8c1e72 6428static int __net_init addrconf_init_net(struct net *net)
e0da5a48 6429{
a79ca223 6430 int err = -ENOMEM;
e0da5a48
PE		 6431 struct ipv6_devconf *all, *dflt;
6432
a79ca223 6433 all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL);
63159f29 6434 if (!all)
a79ca223 6435 goto err_alloc_all;
e0da5a48 6436
a79ca223 6437 dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
63159f29 6438 if (!dflt)
a79ca223 6439 goto err_alloc_dflt;
e0da5a48 6440
a79ca223
HZ		 6441 /* these will be inherited by all namespaces */
6442 dflt->autoconf = ipv6_defaults.autoconf;
6443 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
e0da5a48 6444
3d1bec99
HFS		 6445 dflt->stable_secret.initialized = false;
6446 all->stable_secret.initialized = false;
6447
e0da5a48
PE		 6448 net->ipv6.devconf_all = all;
6449 net->ipv6.devconf_dflt = dflt;
6450
6451#ifdef CONFIG_SYSCTL
f8572d8f 6452 err = __addrconf_sysctl_register(net, "all", NULL, all);
e0da5a48
PE		 6453 if (err < 0)
6454 goto err_reg_all;
6455
f8572d8f 6456 err = __addrconf_sysctl_register(net, "default", NULL, dflt);
e0da5a48
PE		 6457 if (err < 0)
6458 goto err_reg_dflt;
6459#endif
6460 return 0;
6461
6462#ifdef CONFIG_SYSCTL
6463err_reg_dflt:
23452170 6464 __addrconf_sysctl_unregister(net, all, NETCONFA_IFINDEX_ALL);
e0da5a48
PE		 6465err_reg_all:
6466 kfree(dflt);
6467#endif
6468err_alloc_dflt:
6469 kfree(all);
6470err_alloc_all:
6471 return err;
6472}
6473
2c8c1e72 6474static void __net_exit addrconf_exit_net(struct net *net)
e0da5a48
PE		 6475{
6476#ifdef CONFIG_SYSCTL
23452170
DA		 6477 __addrconf_sysctl_unregister(net, net->ipv6.devconf_dflt,
6478 NETCONFA_IFINDEX_DEFAULT);
6479 __addrconf_sysctl_unregister(net, net->ipv6.devconf_all,
6480 NETCONFA_IFINDEX_ALL);
e0da5a48 6481#endif
73cf0e92 6482 kfree(net->ipv6.devconf_dflt);
6483 kfree(net->ipv6.devconf_all);
e0da5a48
PE		 6484}
6485
6486static struct pernet_operations addrconf_ops = {
6487 .init = addrconf_init_net,
6488 .exit = addrconf_exit_net,
6489};
6490
207895fd 6491static struct rtnl_af_ops inet6_ops __read_mostly = {
b382b191
TG		 6492 .family = AF_INET6,
6493 .fill_link_af = inet6_fill_link_af,
6494 .get_link_af_size = inet6_get_link_af_size,
11b1f828 6495 .validate_link_af = inet6_validate_link_af,
f53adae4 6496 .set_link_af = inet6_set_link_af,
b382b191
TG		 6497};
6498
1da177e4
LT		 6499/*
6500 * Init / cleanup code
6501 */
6502
6503int __init addrconf_init(void)
6504{
a317a2f1 6505 struct inet6_dev *idev;
c2e21293 6506 int i, err;
2a8cc6c8 6507
e21e8467
SH		 6508 err = ipv6_addr_label_init();
6509 if (err < 0) {
f3213831
JP		 6510 pr_crit("%s: cannot initialize default policy table: %d\n",
6511 __func__, err);
2cc6d2bf 6512 goto out;
2a8cc6c8 6513 }
1da177e4 6514
2cc6d2bf
NH		 6515 err = register_pernet_subsys(&addrconf_ops);
6516 if (err < 0)
6517 goto out_addrlabel;
e0da5a48 6518
c15b1cca
HFS		 6519 addrconf_wq = create_workqueue("ipv6_addrconf");
6520 if (!addrconf_wq) {
6521 err = -ENOMEM;
6522 goto out_nowq;
6523 }
6524
1da177e4
LT		 6525 /* The addrconf netdev notifier requires that loopback_dev
6526 * has it's ipv6 private information allocated and setup
6527 * before it can bring up and give link-local addresses
6528 * to other devices which are up.
6529 *
6530 * Unfortunately, loopback_dev is not necessarily the first
6531 * entry in the global dev_base list of net devices. In fact,
6532 * it is likely to be the very last entry on that list.
6533 * So this causes the notifier registry below to try and
6534 * give link-local addresses to all devices besides loopback_dev
6535 * first, then loopback_dev, which cases all the non-loopback_dev
6536 * devices to fail to get a link-local address.
6537 *
6538 * So, as a temporary fix, allocate the ipv6 structure for
6539 * loopback_dev first by hand.
6540 * Longer term, all of the dependencies ipv6 has upon the loopback
6541 * device and it being up should be removed.
6542 */
6543 rtnl_lock();
a317a2f1 6544 idev = ipv6_add_dev(init_net.loopback_dev);
1da177e4 6545 rtnl_unlock();
a317a2f1
WC		 6546 if (IS_ERR(idev)) {
6547 err = PTR_ERR(idev);
e0da5a48 6548 goto errlo;
a317a2f1 6549 }
1da177e4 6550
2f460933
WC		 6551 ip6_route_init_special_entries();
6552
c2e21293 6553 for (i = 0; i < IN6_ADDR_HSIZE; i++)
6554 INIT_HLIST_HEAD(&inet6_addr_lst[i]);
6555
1da177e4
LT		 6556 register_netdevice_notifier(&ipv6_dev_notf);
6557
c15b1cca 6558 addrconf_verify();
c127ea2c 6559
3678a9d8 6560 rtnl_af_register(&inet6_ops);
b382b191 6561
c7ac8679 6562 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo,
b97bac64 6563 0);
c127ea2c
TG		 6564 if (err < 0)
6565 goto errout;
6566
6567 /* Only the first call to __rtnl_register can fail */
b97bac64
FW		 6568 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL, 0);
6569 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL, 0);
c7ac8679 6570 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr,
c24675f8 6571 inet6_dump_ifaddr, RTNL_FLAG_DOIT_UNLOCKED);
c7ac8679 6572 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL,
b97bac64 6573 inet6_dump_ifmcaddr, 0);
c7ac8679 6574 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL,
b97bac64 6575 inet6_dump_ifacaddr, 0);
76f8f6cb 6576 __rtnl_register(PF_INET6, RTM_GETNETCONF, inet6_netconf_get_devconf,
4ea2607f 6577 inet6_netconf_dump_devconf, RTNL_FLAG_DOIT_UNLOCKED);
c127ea2c 6578
2a8cc6c8
YH		 6579 ipv6_addr_label_rtnl_register();
6580
1da177e4 6581 return 0;
c127ea2c 6582errout:
b382b191 6583 rtnl_af_unregister(&inet6_ops);
c127ea2c 6584 unregister_netdevice_notifier(&ipv6_dev_notf);
e0da5a48 6585errlo:
c15b1cca
HFS		 6586 destroy_workqueue(addrconf_wq);
6587out_nowq:
e0da5a48 6588 unregister_pernet_subsys(&addrconf_ops);
2cc6d2bf
NH		 6589out_addrlabel:
6590 ipv6_addr_label_cleanup();
6591out:
c127ea2c 6592 return err;
1da177e4
LT		 6593}
6594
09f7709f 6595void addrconf_cleanup(void)
1da177e4 6596{
176c39af 6597 struct net_device *dev;
1da177e4
LT		 6598 int i;
6599
6600 unregister_netdevice_notifier(&ipv6_dev_notf);
e0da5a48 6601 unregister_pernet_subsys(&addrconf_ops);
2cc6d2bf 6602 ipv6_addr_label_cleanup();
1da177e4 6603
5c45121d 6604 rtnl_af_unregister(&inet6_ops);
1da177e4 6605
5c45121d 6606 rtnl_lock();
b382b191 6607
176c39af
DL		 6608 /* clean dev list */
6609 for_each_netdev(&init_net, dev) {
6610 if (__in6_dev_get(dev) == NULL)
6611 continue;
6612 addrconf_ifdown(dev, 1);
6613 }
6614 addrconf_ifdown(init_net.loopback_dev, 2);
6615
1da177e4
LT		 6616 /*
6617 * Check hash table.
6618 */
5c578aed 6619 spin_lock_bh(&addrconf_hash_lock);
c2e21293 6620 for (i = 0; i < IN6_ADDR_HSIZE; i++)
6621 WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
5c578aed 6622 spin_unlock_bh(&addrconf_hash_lock);
c15b1cca 6623 cancel_delayed_work(&addr_chk_work);
1da177e4 6624 rtnl_unlock();
c15b1cca
HFS		 6625
6626 destroy_workqueue(addrconf_wq);
1da177e4 6627}
Linux 6.x block layer and io_uring tree(s)