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[mirror_ubuntu-bionic-kernel.git] / net / ipv6 / addrconf.c
CommitLineData
1da177e4
LT		 1/*
2 * IPv6 Address [auto]configuration
3 * Linux INET6 implementation
4 *
5 * Authors:
1ab1457c 6 * Pedro Roque <roque@di.fc.ul.pt>
1da177e4
LT		 7 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
8 *
1da177e4
LT		 9 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License
11 * as published by the Free Software Foundation; either version
12 * 2 of the License, or (at your option) any later version.
13 */
14
15/*
16 * Changes:
17 *
18 * Janos Farkas : delete timer on ifdown
19 * <chexum@bankinf.banki.hu>
20 * Andi Kleen : kill double kfree on module
21 * unload.
22 * Maciej W. Rozycki : FDDI support
23 * sekiya@USAGI : Don't send too many RS
24 * packets.
25 * yoshfuji@USAGI : Fixed interval between DAD
26 * packets.
27 * YOSHIFUJI Hideaki @USAGI : improved accuracy of
28 * address validation timer.
29 * YOSHIFUJI Hideaki @USAGI : Privacy Extensions (RFC3041)
30 * support.
31 * Yuji SEKIYA @USAGI : Don't assign a same IPv6
32 * address on a same interface.
33 * YOSHIFUJI Hideaki @USAGI : ARCnet support
34 * YOSHIFUJI Hideaki @USAGI : convert /proc/net/if_inet6 to
35 * seq_file.
b1cacb68
YH		 36 * YOSHIFUJI Hideaki @USAGI : improved source address
37 * selection; consider scope,
38 * status etc.
1da177e4
LT		 39 */
40
f3213831
JP		 41#define pr_fmt(fmt) "IPv6: " fmt
42
1da177e4
LT		 43#include <linux/errno.h>
44#include <linux/types.h>
a0bffffc 45#include <linux/kernel.h>
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 159
27c565ae
ED		 160#define IN6_ADDR_HSIZE_SHIFT 8
161#define IN6_ADDR_HSIZE (1 << IN6_ADDR_HSIZE_SHIFT)
1da177e4
LT		 162/*
163 * Configured unicast address hash table
164 */
c2e21293 165static struct hlist_head inet6_addr_lst[IN6_ADDR_HSIZE];
5c578aed 166static DEFINE_SPINLOCK(addrconf_hash_lock);
1da177e4 167
c15b1cca
HFS		 168static void addrconf_verify(void);
169static void addrconf_verify_rtnl(void);
170static void addrconf_verify_work(struct work_struct *);
1da177e4 171
c15b1cca
HFS		 172static struct workqueue_struct *addrconf_wq;
173static DECLARE_DELAYED_WORK(addr_chk_work, addrconf_verify_work);
1da177e4
LT		 174
175static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
176static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
177
93d9b7d7
JP		 178static void addrconf_type_change(struct net_device *dev,
179 unsigned long event);
1da177e4
LT		 180static int addrconf_ifdown(struct net_device *dev, int how);
181
21caa662
RK		 182static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
183 int plen,
184 const struct net_device *dev,
185 u32 flags, u32 noflags);
186
cf22f9a2 187static void addrconf_dad_start(struct inet6_ifaddr *ifp);
c15b1cca 188static void addrconf_dad_work(struct work_struct *w);
db98f2c9
DA		 189static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id,
190 bool send_na);
c5e33bdd 191static void addrconf_dad_run(struct inet6_dev *idev);
e99e88a9 192static void addrconf_rs_timer(struct timer_list *t);
1da177e4
LT		 193static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
194static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
195
1ab1457c 196static void inet6_prefix_notify(int event, struct inet6_dev *idev,
1da177e4 197 struct prefix_info *pinfo);
1da177e4 198
888c848e 199static struct ipv6_devconf ipv6_devconf __read_mostly = {
1da177e4
LT		 200 .forwarding = 0,
201 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
202 .mtu6 = IPV6_MIN_MTU,
203 .accept_ra = 1,
204 .accept_redirects = 1,
205 .autoconf = 1,
206 .force_mld_version = 0,
fc4eba58
HFS		 207 .mldv1_unsolicited_report_interval = 10 * HZ,
208 .mldv2_unsolicited_report_interval = HZ,
1da177e4
LT		 209 .dad_transmits = 1,
210 .rtr_solicits = MAX_RTR_SOLICITATIONS,
211 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
bd11f074 212 .rtr_solicit_max_interval = RTR_SOLICITATION_MAX_INTERVAL,
1da177e4 213 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
67ba4152 214 .use_tempaddr = 0,
1da177e4
LT		 215 .temp_valid_lft = TEMP_VALID_LIFETIME,
216 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
217 .regen_max_retry = REGEN_MAX_RETRY,
218 .max_desync_factor = MAX_DESYNC_FACTOR,
1da177e4 219 .max_addresses = IPV6_MAX_ADDRESSES,
65f5c7c1 220 .accept_ra_defrtr = 1,
d9333196 221 .accept_ra_from_local = 0,
8013d1d7 222 .accept_ra_min_hop_limit= 1,
c4fd30eb 223 .accept_ra_pinfo = 1,
930d6ff2
YH		 224#ifdef CONFIG_IPV6_ROUTER_PREF
225 .accept_ra_rtr_pref = 1,
52e16356 226 .rtr_probe_interval = 60 * HZ,
09c884d4 227#ifdef CONFIG_IPV6_ROUTE_INFO
bbea124b 228 .accept_ra_rt_info_min_plen = 0,
09c884d4
YH		 229 .accept_ra_rt_info_max_plen = 0,
230#endif
930d6ff2 231#endif
fbea49e1 232 .proxy_ndp = 0,
0bcbc926 233 .accept_source_route = 0, /* we do not accept RH0 by default. */
778d80be 234 .disable_ipv6 = 0,
09400953 235 .accept_dad = 0,
b800c3b9 236 .suppress_frag_ndisc = 1,
c2943f14 237 .accept_ra_mtu = 1,
3d1bec99
HFS		 238 .stable_secret = {
239 .initialized = false,
3985e8a3
EK		 240 },
241 .use_oif_addrs_only = 0,
35103d11 242 .ignore_routes_with_linkdown = 0,
f1705ec1 243 .keep_addr_on_down = 0,
1ababeba 244 .seg6_enabled = 0,
bf355b8d
DL		 245#ifdef CONFIG_IPV6_SEG6_HMAC
246 .seg6_require_hmac = 0,
247#endif
adc176c5 248 .enhanced_dad = 1,
d35a00b8 249 .addr_gen_mode = IN6_ADDR_GEN_MODE_EUI64,
df789fe7 250 .disable_policy = 0,
1da177e4
LT		 251};
252
ab32ea5d 253static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
1da177e4
LT		 254 .forwarding = 0,
255 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
256 .mtu6 = IPV6_MIN_MTU,
257 .accept_ra = 1,
258 .accept_redirects = 1,
259 .autoconf = 1,
fc4eba58
HFS		 260 .force_mld_version = 0,
261 .mldv1_unsolicited_report_interval = 10 * HZ,
262 .mldv2_unsolicited_report_interval = HZ,
1da177e4
LT		 263 .dad_transmits = 1,
264 .rtr_solicits = MAX_RTR_SOLICITATIONS,
265 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
bd11f074 266 .rtr_solicit_max_interval = RTR_SOLICITATION_MAX_INTERVAL,
1da177e4 267 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
1da177e4
LT		 268 .use_tempaddr = 0,
269 .temp_valid_lft = TEMP_VALID_LIFETIME,
270 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
271 .regen_max_retry = REGEN_MAX_RETRY,
272 .max_desync_factor = MAX_DESYNC_FACTOR,
1da177e4 273 .max_addresses = IPV6_MAX_ADDRESSES,
65f5c7c1 274 .accept_ra_defrtr = 1,
d9333196 275 .accept_ra_from_local = 0,
8013d1d7 276 .accept_ra_min_hop_limit= 1,
c4fd30eb 277 .accept_ra_pinfo = 1,
930d6ff2
YH		 278#ifdef CONFIG_IPV6_ROUTER_PREF
279 .accept_ra_rtr_pref = 1,
52e16356 280 .rtr_probe_interval = 60 * HZ,
09c884d4 281#ifdef CONFIG_IPV6_ROUTE_INFO
bbea124b 282 .accept_ra_rt_info_min_plen = 0,
09c884d4
YH		 283 .accept_ra_rt_info_max_plen = 0,
284#endif
930d6ff2 285#endif
fbea49e1 286 .proxy_ndp = 0,
0bcbc926 287 .accept_source_route = 0, /* we do not accept RH0 by default. */
778d80be 288 .disable_ipv6 = 0,
1b34be74 289 .accept_dad = 1,
b800c3b9 290 .suppress_frag_ndisc = 1,
c2943f14 291 .accept_ra_mtu = 1,
3d1bec99
HFS		 292 .stable_secret = {
293 .initialized = false,
294 },
3985e8a3 295 .use_oif_addrs_only = 0,
35103d11 296 .ignore_routes_with_linkdown = 0,
f1705ec1 297 .keep_addr_on_down = 0,
1ababeba 298 .seg6_enabled = 0,
bf355b8d
DL		 299#ifdef CONFIG_IPV6_SEG6_HMAC
300 .seg6_require_hmac = 0,
301#endif
adc176c5 302 .enhanced_dad = 1,
d35a00b8 303 .addr_gen_mode = IN6_ADDR_GEN_MODE_EUI64,
df789fe7 304 .disable_policy = 0,
1da177e4
LT		 305};
306
1f372c7b
MM		 307/* Check if link is ready: is it up and is a valid qdisc available */
308static inline bool addrconf_link_ready(const struct net_device *dev)
f24e3d65 309{
1f372c7b 310 return netif_oper_up(dev) && !qdisc_tx_is_noop(dev);
f24e3d65
MC		 311}
312
b7b1bfce 313static void addrconf_del_rs_timer(struct inet6_dev *idev)
1da177e4 314{
b7b1bfce
HFS		 315 if (del_timer(&idev->rs_timer))
316 __in6_dev_put(idev);
317}
318
c15b1cca 319static void addrconf_del_dad_work(struct inet6_ifaddr *ifp)
b7b1bfce 320{
c15b1cca 321 if (cancel_delayed_work(&ifp->dad_work))
1da177e4
LT		 322 __in6_ifa_put(ifp);
323}
324
b7b1bfce
HFS		 325static void addrconf_mod_rs_timer(struct inet6_dev *idev,
326 unsigned long when)
327{
328 if (!timer_pending(&idev->rs_timer))
329 in6_dev_hold(idev);
330 mod_timer(&idev->rs_timer, jiffies + when);
331}
1da177e4 332
c15b1cca
HFS		 333static void addrconf_mod_dad_work(struct inet6_ifaddr *ifp,
334 unsigned long delay)
1da177e4 335{
f8a894b2
XL		 336 in6_ifa_hold(ifp);
337 if (mod_delayed_work(addrconf_wq, &ifp->dad_work, delay))
338 in6_ifa_put(ifp);
1da177e4
LT		 339}
340
7f7d9a6b
HX		 341static int snmp6_alloc_dev(struct inet6_dev *idev)
342{
827da44c
JS		 343 int i;
344
698365fa
WC		 345 idev->stats.ipv6 = alloc_percpu(struct ipstats_mib);
346 if (!idev->stats.ipv6)
7f7d9a6b 347 goto err_ip;
827da44c
JS		 348
349 for_each_possible_cpu(i) {
350 struct ipstats_mib *addrconf_stats;
698365fa 351 addrconf_stats = per_cpu_ptr(idev->stats.ipv6, i);
827da44c 352 u64_stats_init(&addrconf_stats->syncp);
827da44c
JS		 353 }
354
355
be281e55
ED		 356 idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device),
357 GFP_KERNEL);
358 if (!idev->stats.icmpv6dev)
7f7d9a6b 359 goto err_icmp;
be281e55
ED		 360 idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device),
361 GFP_KERNEL);
362 if (!idev->stats.icmpv6msgdev)
14878f75 363 goto err_icmpmsg;
7f7d9a6b
HX		 364
365 return 0;
366
14878f75 367err_icmpmsg:
be281e55 368 kfree(idev->stats.icmpv6dev);
7f7d9a6b 369err_icmp:
698365fa 370 free_percpu(idev->stats.ipv6);
7f7d9a6b 371err_ip:
aaf70ec7 372 return -ENOMEM;
7f7d9a6b
HX		 373}
374
8e5e8f30 375static struct inet6_dev *ipv6_add_dev(struct net_device *dev)
1da177e4
LT		 376{
377 struct inet6_dev *ndev;
a317a2f1 378 int err = -ENOMEM;
1da177e4
LT		 379
380 ASSERT_RTNL();
381
382 if (dev->mtu < IPV6_MIN_MTU)
a317a2f1 383 return ERR_PTR(-EINVAL);
1da177e4 384
1ab1457c 385 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
63159f29 386 if (!ndev)
a317a2f1 387 return ERR_PTR(err);
322f74a4
IO		 388
389 rwlock_init(&ndev->lock);
390 ndev->dev = dev;
502a2ffd 391 INIT_LIST_HEAD(&ndev->addr_list);
e99e88a9 392 timer_setup(&ndev->rs_timer, addrconf_rs_timer, 0);
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
3f27fb23 955static u32 inet6_addr_hash(const struct net *net, const struct in6_addr *addr)
3eb84f49 956{
3f27fb23
ED		 957 u32 val = ipv6_addr_hash(addr) ^ net_hash_mix(net);
958
959 return hash_32(val, IN6_ADDR_HSIZE_SHIFT);
3eb84f49
YH		 960}
961
56fc709b 962static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
752a9292 963 struct net_device *dev, unsigned int hash)
56fc709b 964{
56fc709b
ED		 965 struct inet6_ifaddr *ifp;
966
967 hlist_for_each_entry(ifp, &inet6_addr_lst[hash], addr_lst) {
968 if (!net_eq(dev_net(ifp->idev->dev), net))
969 continue;
970 if (ipv6_addr_equal(&ifp->addr, addr)) {
971 if (!dev || ifp->idev->dev == dev)
972 return true;
973 }
974 }
975 return false;
976}
977
f3d9832e
DA		 978static int ipv6_add_addr_hash(struct net_device *dev, struct inet6_ifaddr *ifa)
979{
3f27fb23 980 unsigned int hash = inet6_addr_hash(dev_net(dev), &ifa->addr);
f3d9832e
DA		 981 int err = 0;
982
983 spin_lock(&addrconf_hash_lock);
984
985 /* Ignore adding duplicate addresses on an interface */
752a9292 986 if (ipv6_chk_same_addr(dev_net(dev), &ifa->addr, dev, hash)) {
f3d9832e
DA		 987 ADBG("ipv6_add_addr: already assigned\n");
988 err = -EEXIST;
752a9292
ED		 989 } else {
990 hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]);
f3d9832e
DA		 991 }
992
f3d9832e
DA		 993 spin_unlock(&addrconf_hash_lock);
994
995 return err;
996}
997
1da177e4
LT		 998/* On success it returns ifp with increased reference count */
999
1000static struct inet6_ifaddr *
3f8f5298
JP		 1001ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
1002 const struct in6_addr *peer_addr, int pfxlen,
f3d9832e 1003 int scope, u32 flags, u32 valid_lft, u32 prefered_lft,
de95e047 1004 bool can_block, struct netlink_ext_ack *extack)
1da177e4 1005{
f3d9832e 1006 gfp_t gfp_flags = can_block ? GFP_KERNEL : GFP_ATOMIC;
df789fe7 1007 struct net *net = dev_net(idev->dev);
1da177e4 1008 struct inet6_ifaddr *ifa = NULL;
f3d9832e 1009 struct rt6_info *rt = NULL;
1da177e4 1010 int err = 0;
d68b8270
YH		 1011 int addr_type = ipv6_addr_type(addr);
1012
1013 if (addr_type == IPV6_ADDR_ANY ||
1014 addr_type & IPV6_ADDR_MULTICAST ||
1015 (!(idev->dev->flags & IFF_LOOPBACK) &&
1016 addr_type & IPV6_ADDR_LOOPBACK))
1017 return ERR_PTR(-EADDRNOTAVAIL);
1da177e4 1018
1da177e4
LT		 1019 if (idev->dead) {
1020 err = -ENODEV; /*XXX*/
f3d9832e 1021 goto out;
1da177e4
LT		 1022 }
1023
56d417b1 1024 if (idev->cnf.disable_ipv6) {
9bdd8d40 1025 err = -EACCES;
f3d9832e 1026 goto out;
9bdd8d40
BH		 1027 }
1028
ff7883ea
DA		 1029 /* validator notifier needs to be blocking;
1030 * do not call in atomic context
1031 */
1032 if (can_block) {
1033 struct in6_validator_info i6vi = {
1034 .i6vi_addr = *addr,
1035 .i6vi_dev = idev,
de95e047 1036 .extack = extack,
ff7883ea
DA		 1037 };
1038
1039 err = inet6addr_validator_notifier_call_chain(NETDEV_UP, &i6vi);
1040 err = notifier_to_errno(err);
1041 if (err < 0)
1042 goto out;
1043 }
1da177e4 1044
f3d9832e 1045 ifa = kzalloc(sizeof(*ifa), gfp_flags);
63159f29 1046 if (!ifa) {
ba3542e1 1047 ADBG("ipv6_add_addr: malloc failed\n");
1da177e4
LT		 1048 err = -ENOBUFS;
1049 goto out;
1050 }
1051
8f031519 1052 rt = addrconf_dst_alloc(idev, addr, false);
1da177e4
LT		 1053 if (IS_ERR(rt)) {
1054 err = PTR_ERR(rt);
f3d9832e 1055 rt = NULL;
1da177e4
LT		 1056 goto out;
1057 }
1058
df789fe7
DF		 1059 if (net->ipv6.devconf_all->disable_policy ||
1060 idev->cnf.disable_policy)
1061 rt->dst.flags |= DST_NOPOLICY;
1062
bba24896
JP		 1063 neigh_parms_data_state_setall(idev->nd_parms);
1064
4e3fd7a0 1065 ifa->addr = *addr;
3f8f5298
JP		 1066 if (peer_addr)
1067 ifa->peer_addr = *peer_addr;
1da177e4
LT		 1068
1069 spin_lock_init(&ifa->lock);
c15b1cca 1070 INIT_DELAYED_WORK(&ifa->dad_work, addrconf_dad_work);
c2e21293 1071 INIT_HLIST_NODE(&ifa->addr_lst);
1da177e4
LT		 1072 ifa->scope = scope;
1073 ifa->prefix_len = pfxlen;
66eb9f86
MB		 1074 ifa->flags = flags;
1075 /* No need to add the TENTATIVE flag for addresses with NODAD */
1076 if (!(flags & IFA_F_NODAD))
1077 ifa->flags |= IFA_F_TENTATIVE;
8a226b2c
JB		 1078 ifa->valid_lft = valid_lft;
1079 ifa->prefered_lft = prefered_lft;
1da177e4 1080 ifa->cstamp = ifa->tstamp = jiffies;
617fe29d 1081 ifa->tokenized = false;
1da177e4 1082
57f5f544
KF		 1083 ifa->rt = rt;
1084
1da177e4 1085 ifa->idev = idev;
f3d9832e
DA		 1086 in6_dev_hold(idev);
1087
1da177e4 1088 /* For caller */
271201c0 1089 refcount_set(&ifa->refcnt, 1);
1da177e4 1090
f3d9832e 1091 rcu_read_lock_bh();
1da177e4 1092
f3d9832e
DA		 1093 err = ipv6_add_addr_hash(idev->dev, ifa);
1094 if (err < 0) {
1095 rcu_read_unlock_bh();
1096 goto out;
1097 }
1da177e4
LT		 1098
1099 write_lock(&idev->lock);
f3d9832e 1100
1da177e4 1101 /* Add to inet6_dev unicast addr list. */
e55ffac6 1102 ipv6_link_dev_addr(idev, ifa);
1da177e4 1103
1da177e4 1104 if (ifa->flags&IFA_F_TEMPORARY) {
372e6c8f 1105 list_add(&ifa->tmp_list, &idev->tempaddr_list);
1da177e4
LT		 1106 in6_ifa_hold(ifa);
1107 }
1da177e4 1108
1da177e4
LT		 1109 in6_ifa_hold(ifa);
1110 write_unlock(&idev->lock);
f3d9832e 1111
8814c4b5 1112 rcu_read_unlock_bh();
1da177e4 1113
f3d9832e
DA		 1114 inet6addr_notifier_call_chain(NETDEV_UP, ifa);
1115out:
1116 if (unlikely(err < 0)) {
1117 if (rt)
1118 ip6_rt_put(rt);
1119 if (ifa) {
1120 if (ifa->idev)
1121 in6_dev_put(ifa->idev);
1122 kfree(ifa);
1123 }
1da177e4
LT		 1124 ifa = ERR_PTR(err);
1125 }
1126
1127 return ifa;
1da177e4
LT		 1128}
1129
5b84efec
TH		 1130enum cleanup_prefix_rt_t {
1131 CLEANUP_PREFIX_RT_NOP, /* no cleanup action for prefix route */
1132 CLEANUP_PREFIX_RT_DEL, /* delete the prefix route */
1133 CLEANUP_PREFIX_RT_EXPIRE, /* update the lifetime of the prefix route */
1134};
1135
1136/*
1137 * Check, whether the prefix for ifp would still need a prefix route
1138 * after deleting ifp. The function returns one of the CLEANUP_PREFIX_RT_*
1139 * constants.
1140 *
1141 * 1) we don't purge prefix if address was not permanent.
1142 * prefix is managed by its own lifetime.
1143 * 2) we also don't purge, if the address was IFA_F_NOPREFIXROUTE.
1144 * 3) if there are no addresses, delete prefix.
1145 * 4) if there are still other permanent address(es),
1146 * corresponding prefix is still permanent.
1147 * 5) if there are still other addresses with IFA_F_NOPREFIXROUTE,
1148 * don't purge the prefix, assume user space is managing it.
1149 * 6) otherwise, update prefix lifetime to the
1150 * longest valid lifetime among the corresponding
1151 * addresses on the device.
1152 * Note: subsequent RA will update lifetime.
1153 **/
1154static enum cleanup_prefix_rt_t
1155check_cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long *expires)
1156{
1157 struct inet6_ifaddr *ifa;
1158 struct inet6_dev *idev = ifp->idev;
1159 unsigned long lifetime;
1160 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_DEL;
1161
1162 *expires = jiffies;
1163
1164 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1165 if (ifa == ifp)
1166 continue;
1167 if (!ipv6_prefix_equal(&ifa->addr, &ifp->addr,
1168 ifp->prefix_len))
1169 continue;
1170 if (ifa->flags & (IFA_F_PERMANENT | IFA_F_NOPREFIXROUTE))
1171 return CLEANUP_PREFIX_RT_NOP;
1172
1173 action = CLEANUP_PREFIX_RT_EXPIRE;
1174
1175 spin_lock(&ifa->lock);
1176
1177 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
1178 /*
1179 * Note: Because this address is
1180 * not permanent, lifetime <
1181 * LONG_MAX / HZ here.
1182 */
1183 if (time_before(*expires, ifa->tstamp + lifetime * HZ))
1184 *expires = ifa->tstamp + lifetime * HZ;
1185 spin_unlock(&ifa->lock);
1186 }
1187
1188 return action;
1189}
1190
1191static void
1192cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long expires, bool del_rt)
1193{
1194 struct rt6_info *rt;
1195
1196 rt = addrconf_get_prefix_route(&ifp->addr,
1197 ifp->prefix_len,
1198 ifp->idev->dev,
1199 0, RTF_GATEWAY | RTF_DEFAULT);
1200 if (rt) {
1201 if (del_rt)
1202 ip6_del_rt(rt);
1203 else {
1204 if (!(rt->rt6i_flags & RTF_EXPIRES))
1205 rt6_set_expires(rt, expires);
1206 ip6_rt_put(rt);
1207 }
1208 }
1209}
1210
1211
1da177e4
LT		 1212/* This function wants to get referenced ifp and releases it before return */
1213
1214static void ipv6_del_addr(struct inet6_ifaddr *ifp)
1215{
4c5ff6a6 1216 int state;
5b84efec
TH		 1217 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_NOP;
1218 unsigned long expires;
1da177e4 1219
c15b1cca
HFS		 1220 ASSERT_RTNL();
1221
8e8e676d 1222 spin_lock_bh(&ifp->lock);
4c5ff6a6 1223 state = ifp->state;
e9d3e084 1224 ifp->state = INET6_IFADDR_STATE_DEAD;
8e8e676d 1225 spin_unlock_bh(&ifp->lock);
4c5ff6a6
HX		 1226
1227 if (state == INET6_IFADDR_STATE_DEAD)
1228 goto out;
1da177e4 1229
5c578aed 1230 spin_lock_bh(&addrconf_hash_lock);
1231 hlist_del_init_rcu(&ifp->addr_lst);
5c578aed 1232 spin_unlock_bh(&addrconf_hash_lock);
1da177e4 1233
5b84efec 1234 write_lock_bh(&ifp->idev->lock);
5d9efa7e 1235
1da177e4 1236 if (ifp->flags&IFA_F_TEMPORARY) {
372e6c8f 1237 list_del(&ifp->tmp_list);
1238 if (ifp->ifpub) {
1239 in6_ifa_put(ifp->ifpub);
1240 ifp->ifpub = NULL;
1da177e4 1241 }
372e6c8f 1242 __in6_ifa_put(ifp);
1da177e4 1243 }
1da177e4 1244
5b84efec
TH		 1245 if (ifp->flags & IFA_F_PERMANENT && !(ifp->flags & IFA_F_NOPREFIXROUTE))
1246 action = check_cleanup_prefix_route(ifp, &expires);
502a2ffd 1247
8ef802aa 1248 list_del_rcu(&ifp->if_list);
5b84efec
TH		 1249 __in6_ifa_put(ifp);
1250
1251 write_unlock_bh(&ifp->idev->lock);
1da177e4 1252
c15b1cca 1253 addrconf_del_dad_work(ifp);
b2238566 1254
1da177e4
LT		 1255 ipv6_ifa_notify(RTM_DELADDR, ifp);
1256
f88c91dd 1257 inet6addr_notifier_call_chain(NETDEV_DOWN, ifp);
1da177e4 1258
5b84efec
TH		 1259 if (action != CLEANUP_PREFIX_RT_NOP) {
1260 cleanup_prefix_route(ifp, expires,
1261 action == CLEANUP_PREFIX_RT_DEL);
1da177e4
LT		 1262 }
1263
c3968a85
DW		 1264 /* clean up prefsrc entries */
1265 rt6_remove_prefsrc(ifp);
4c5ff6a6 1266out:
1da177e4
LT		 1267 in6_ifa_put(ifp);
1268}
1269
fffcefe9
ED		 1270static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp,
1271 struct inet6_ifaddr *ift,
1272 bool block)
1da177e4
LT		 1273{
1274 struct inet6_dev *idev = ifp->idev;
1275 struct in6_addr addr, *tmpaddr;
76f793e3 1276 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_tstamp, age;
eac55bf9 1277 unsigned long regen_advance;
1da177e4
LT		 1278 int tmp_plen;
1279 int ret = 0;
95c385b4 1280 u32 addr_flags;
76f793e3 1281 unsigned long now = jiffies;
76506a98 1282 long max_desync_factor;
7aa8e63f 1283 s32 cnf_temp_preferred_lft;
1da177e4 1284
53bd6749 1285 write_lock_bh(&idev->lock);
1da177e4
LT		 1286 if (ift) {
1287 spin_lock_bh(&ift->lock);
1288 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
1289 spin_unlock_bh(&ift->lock);
1290 tmpaddr = &addr;
1291 } else {
1292 tmpaddr = NULL;
1293 }
1294retry:
1295 in6_dev_hold(idev);
1296 if (idev->cnf.use_tempaddr <= 0) {
53bd6749 1297 write_unlock_bh(&idev->lock);
f3213831 1298 pr_info("%s: use_tempaddr is disabled\n", __func__);
1da177e4
LT		 1299 in6_dev_put(idev);
1300 ret = -1;
1301 goto out;
1302 }
1303 spin_lock_bh(&ifp->lock);
1304 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
1305 idev->cnf.use_tempaddr = -1; /*XXX*/
1306 spin_unlock_bh(&ifp->lock);
53bd6749 1307 write_unlock_bh(&idev->lock);
f3213831
JP		 1308 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n",
1309 __func__);
1da177e4
LT		 1310 in6_dev_put(idev);
1311 ret = -1;
1312 goto out;
1313 }
1314 in6_ifa_hold(ifp);
1315 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
9d6280da 1316 ipv6_try_regen_rndid(idev, tmpaddr);
1da177e4 1317 memcpy(&addr.s6_addr[8], idev->rndid, 8);
76f793e3 1318 age = (now - ifp->tstamp) / HZ;
76506a98
JB		 1319
1320 regen_advance = idev->cnf.regen_max_retry *
1321 idev->cnf.dad_transmits *
1322 NEIGH_VAR(idev->nd_parms, RETRANS_TIME) / HZ;
1323
1324 /* recalculate max_desync_factor each time and update
1325 * idev->desync_factor if it's larger
1326 */
7aa8e63f 1327 cnf_temp_preferred_lft = READ_ONCE(idev->cnf.temp_prefered_lft);
76506a98
JB		 1328 max_desync_factor = min_t(__u32,
1329 idev->cnf.max_desync_factor,
7aa8e63f 1330 cnf_temp_preferred_lft - regen_advance);
76506a98
JB		 1331
1332 if (unlikely(idev->desync_factor > max_desync_factor)) {
1333 if (max_desync_factor > 0) {
1334 get_random_bytes(&idev->desync_factor,
1335 sizeof(idev->desync_factor));
1336 idev->desync_factor %= max_desync_factor;
1337 } else {
1338 idev->desync_factor = 0;
1339 }
1340 }
1341
1da177e4
LT		 1342 tmp_valid_lft = min_t(__u32,
1343 ifp->valid_lft,
7a876b0e 1344 idev->cnf.temp_valid_lft + age);
7aa8e63f 1345 tmp_prefered_lft = cnf_temp_preferred_lft + age -
76506a98 1346 idev->desync_factor;
76506a98 1347 tmp_prefered_lft = min_t(__u32, ifp->prefered_lft, tmp_prefered_lft);
1da177e4 1348 tmp_plen = ifp->prefix_len;
1da177e4
LT		 1349 tmp_tstamp = ifp->tstamp;
1350 spin_unlock_bh(&ifp->lock);
1351
53bd6749 1352 write_unlock_bh(&idev->lock);
95c385b4 1353
eac55bf9
BB		 1354 /* A temporary address is created only if this calculated Preferred
1355 * Lifetime is greater than REGEN_ADVANCE time units. In particular,
1356 * an implementation must not create a temporary address with a zero
1357 * Preferred Lifetime.
ecab6701
HK		 1358 * Use age calculation as in addrconf_verify to avoid unnecessary
1359 * temporary addresses being generated.
eac55bf9 1360 */
ecab6701
HK		 1361 age = (now - tmp_tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
1362 if (tmp_prefered_lft <= regen_advance + age) {
eac55bf9
BB		 1363 in6_ifa_put(ifp);
1364 in6_dev_put(idev);
1365 ret = -1;
1366 goto out;
1367 }
1368
95c385b4
NH		 1369 addr_flags = IFA_F_TEMPORARY;
1370 /* set in addrconf_prefix_rcv() */
1371 if (ifp->flags & IFA_F_OPTIMISTIC)
1372 addr_flags |= IFA_F_OPTIMISTIC;
1373
4b08a8f1
HFS		 1374 ift = ipv6_add_addr(idev, &addr, NULL, tmp_plen,
1375 ipv6_addr_scope(&addr), addr_flags,
fffcefe9 1376 tmp_valid_lft, tmp_prefered_lft, block, NULL);
4b08a8f1 1377 if (IS_ERR(ift)) {
1da177e4
LT		 1378 in6_ifa_put(ifp);
1379 in6_dev_put(idev);
f3213831 1380 pr_info("%s: retry temporary address regeneration\n", __func__);
1da177e4 1381 tmpaddr = &addr;
53bd6749 1382 write_lock_bh(&idev->lock);
1da177e4
LT		 1383 goto retry;
1384 }
1385
1386 spin_lock_bh(&ift->lock);
1387 ift->ifpub = ifp;
76f793e3 1388 ift->cstamp = now;
1da177e4
LT		 1389 ift->tstamp = tmp_tstamp;
1390 spin_unlock_bh(&ift->lock);
1391
cf22f9a2 1392 addrconf_dad_start(ift);
1da177e4
LT		 1393 in6_ifa_put(ift);
1394 in6_dev_put(idev);
1395out:
1396 return ret;
1397}
1da177e4
LT		 1398
1399/*
072047e4 1400 * Choose an appropriate source address (RFC3484)
1da177e4 1401 */
a9b05723
YH		 1402enum {
1403 IPV6_SADDR_RULE_INIT = 0,
1404 IPV6_SADDR_RULE_LOCAL,
1405 IPV6_SADDR_RULE_SCOPE,
1406 IPV6_SADDR_RULE_PREFERRED,
1407#ifdef CONFIG_IPV6_MIP6
1408 IPV6_SADDR_RULE_HOA,
1409#endif
1410 IPV6_SADDR_RULE_OIF,
1411 IPV6_SADDR_RULE_LABEL,
a9b05723 1412 IPV6_SADDR_RULE_PRIVACY,
a9b05723
YH		 1413 IPV6_SADDR_RULE_ORCHID,
1414 IPV6_SADDR_RULE_PREFIX,
7fd2561e
EK		 1415#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1416 IPV6_SADDR_RULE_NOT_OPTIMISTIC,
1417#endif
a9b05723
YH		 1418 IPV6_SADDR_RULE_MAX
1419};
1420
072047e4 1421struct ipv6_saddr_score {
a9b05723
YH		 1422 int rule;
1423 int addr_type;
1424 struct inet6_ifaddr *ifa;
1425 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
1426 int scopedist;
1427 int matchlen;
072047e4
YH		 1428};
1429
a9b05723 1430struct ipv6_saddr_dst {
9acd9f3a 1431 const struct in6_addr *addr;
a9b05723
YH		 1432 int ifindex;
1433 int scope;
1434 int label;
7cbca67c 1435 unsigned int prefs;
a9b05723 1436};
072047e4 1437
b6f99a21 1438static inline int ipv6_saddr_preferred(int type)
1da177e4 1439{
45bb0060 1440 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
072047e4
YH		 1441 return 1;
1442 return 0;
1da177e4
LT		 1443}
1444
35e015e1
MC		 1445static bool ipv6_use_optimistic_addr(struct net *net,
1446 struct inet6_dev *idev)
7fd2561e
EK		 1447{
1448#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
35e015e1
MC		 1449 if (!idev)
1450 return false;
1451 if (!net->ipv6.devconf_all->optimistic_dad && !idev->cnf.optimistic_dad)
1452 return false;
1453 if (!net->ipv6.devconf_all->use_optimistic && !idev->cnf.use_optimistic)
1454 return false;
1455
1456 return true;
7fd2561e
EK		 1457#else
1458 return false;
1459#endif
1460}
1461
3de23255
BT		 1462static int ipv6_get_saddr_eval(struct net *net,
1463 struct ipv6_saddr_score *score,
a9b05723
YH		 1464 struct ipv6_saddr_dst *dst,
1465 int i)
1466{
1467 int ret;
1468
1469 if (i <= score->rule) {
1470 switch (i) {
1471 case IPV6_SADDR_RULE_SCOPE:
1472 ret = score->scopedist;
1473 break;
1474 case IPV6_SADDR_RULE_PREFIX:
1475 ret = score->matchlen;
1476 break;
1477 default:
1478 ret = !!test_bit(i, score->scorebits);
1479 }
1480 goto out;
1481 }
1482
1483 switch (i) {
1484 case IPV6_SADDR_RULE_INIT:
1485 /* Rule 0: remember if hiscore is not ready yet */
1486 ret = !!score->ifa;
1487 break;
1488 case IPV6_SADDR_RULE_LOCAL:
1489 /* Rule 1: Prefer same address */
1490 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1491 break;
1492 case IPV6_SADDR_RULE_SCOPE:
1493 /* Rule 2: Prefer appropriate scope
1494 *
1495 * ret
1496 * ^
1497 * -1 | d 15
1498 * ---+--+-+---> scope
1499 * |
1500 * | d is scope of the destination.
1501 * B-d | \
1502 * | \ <- smaller scope is better if
db9c7c39 1503 * B-15 | \ if scope is enough for destination.
a9b05723
YH		 1504 * | ret = B - scope (-1 <= scope >= d <= 15).
1505 * d-C-1 | /
1506 * |/ <- greater is better
1507 * -C / if scope is not enough for destination.
1508 * /| ret = scope - C (-1 <= d < scope <= 15).
1509 *
1510 * d - C - 1 < B -15 (for all -1 <= d <= 15).
1511 * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1512 * Assume B = 0 and we get C > 29.
1513 */
1514 ret = __ipv6_addr_src_scope(score->addr_type);
1515 if (ret >= dst->scope)
1516 ret = -ret;
1517 else
1518 ret -= 128; /* 30 is enough */
1519 score->scopedist = ret;
1520 break;
1521 case IPV6_SADDR_RULE_PREFERRED:
7fd2561e 1522 {
a9b05723 1523 /* Rule 3: Avoid deprecated and optimistic addresses */
7fd2561e
EK		 1524 u8 avoid = IFA_F_DEPRECATED;
1525
35e015e1 1526 if (!ipv6_use_optimistic_addr(net, score->ifa->idev))
7fd2561e 1527 avoid |= IFA_F_OPTIMISTIC;
a9b05723 1528 ret = ipv6_saddr_preferred(score->addr_type) ||
7fd2561e 1529 !(score->ifa->flags & avoid);
a9b05723 1530 break;
7fd2561e 1531 }
a9b05723
YH		 1532#ifdef CONFIG_IPV6_MIP6
1533 case IPV6_SADDR_RULE_HOA:
7cbca67c 1534 {
a9b05723 1535 /* Rule 4: Prefer home address */
7cbca67c
YH		 1536 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1537 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
a9b05723 1538 break;
7cbca67c 1539 }
a9b05723
YH		 1540#endif
1541 case IPV6_SADDR_RULE_OIF:
1542 /* Rule 5: Prefer outgoing interface */
1543 ret = (!dst->ifindex ||
1544 dst->ifindex == score->ifa->idev->dev->ifindex);
1545 break;
1546 case IPV6_SADDR_RULE_LABEL:
1547 /* Rule 6: Prefer matching label */
3de23255
BT		 1548 ret = ipv6_addr_label(net,
1549 &score->ifa->addr, score->addr_type,
a9b05723
YH		 1550 score->ifa->idev->dev->ifindex) == dst->label;
1551 break;
a9b05723 1552 case IPV6_SADDR_RULE_PRIVACY:
7cbca67c 1553 {
a9b05723 1554 /* Rule 7: Prefer public address
25985edc 1555 * Note: prefer temporary address if use_tempaddr >= 2
a9b05723 1556 */
7cbca67c
YH		 1557 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1558 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1559 score->ifa->idev->cnf.use_tempaddr >= 2;
1560 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
a9b05723 1561 break;
7cbca67c 1562 }
a9b05723
YH		 1563 case IPV6_SADDR_RULE_ORCHID:
1564 /* Rule 8-: Prefer ORCHID vs ORCHID or
1565 * non-ORCHID vs non-ORCHID
1566 */
1567 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1568 ipv6_addr_orchid(dst->addr));
1569 break;
1570 case IPV6_SADDR_RULE_PREFIX:
1571 /* Rule 8: Use longest matching prefix */
91b4b04f
YH		 1572 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr);
1573 if (ret > score->ifa->prefix_len)
1574 ret = score->ifa->prefix_len;
1575 score->matchlen = ret;
a9b05723 1576 break;
7fd2561e
EK		 1577#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1578 case IPV6_SADDR_RULE_NOT_OPTIMISTIC:
1579 /* Optimistic addresses still have lower precedence than other
1580 * preferred addresses.
1581 */
1582 ret = !(score->ifa->flags & IFA_F_OPTIMISTIC);
1583 break;
1584#endif
a9b05723
YH		 1585 default:
1586 ret = 0;
1587 }
1588
1589 if (ret)
1590 __set_bit(i, score->scorebits);
1591 score->rule = i;
1592out:
1593 return ret;
1594}
1595
c0b8da1e
YH		 1596static int __ipv6_dev_get_saddr(struct net *net,
1597 struct ipv6_saddr_dst *dst,
c0b8da1e
YH		 1598 struct inet6_dev *idev,
1599 struct ipv6_saddr_score *scores,
1600 int hiscore_idx)
9131f3de 1601{
c0b8da1e 1602 struct ipv6_saddr_score *score = &scores[1 - hiscore_idx], *hiscore = &scores[hiscore_idx];
9131f3de 1603
f59c031e 1604 list_for_each_entry_rcu(score->ifa, &idev->addr_list, if_list) {
9131f3de
YH		 1605 int i;
1606
1607 /*
1608 * - Tentative Address (RFC2462 section 5.4)
1609 * - A tentative address is not considered
1610 * "assigned to an interface" in the traditional
1611 * sense, unless it is also flagged as optimistic.
1612 * - Candidate Source Address (section 4)
1613 * - In any case, anycast addresses, multicast
1614 * addresses, and the unspecified address MUST
1615 * NOT be included in a candidate set.
1616 */
1617 if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1618 (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
1619 continue;
1620
1621 score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1622
1623 if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1624 score->addr_type & IPV6_ADDR_MULTICAST)) {
1625 net_dbg_ratelimited("ADDRCONF: unspecified / multicast address assigned as unicast address on %s",
1626 idev->dev->name);
1627 continue;
1628 }
1629
1630 score->rule = -1;
1631 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1632
1633 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1634 int minihiscore, miniscore;
1635
1636 minihiscore = ipv6_get_saddr_eval(net, hiscore, dst, i);
1637 miniscore = ipv6_get_saddr_eval(net, score, dst, i);
1638
1639 if (minihiscore > miniscore) {
1640 if (i == IPV6_SADDR_RULE_SCOPE &&
1641 score->scopedist > 0) {
1642 /*
1643 * special case:
1644 * each remaining entry
1645 * has too small (not enough)
1646 * scope, because ifa entries
1647 * are sorted by their scope
1648 * values.
1649 */
1650 goto out;
1651 }
1652 break;
1653 } else if (minihiscore < miniscore) {
9131f3de 1654 swap(hiscore, score);
c0b8da1e 1655 hiscore_idx = 1 - hiscore_idx;
9131f3de
YH		 1656
1657 /* restore our iterator */
1658 score->ifa = hiscore->ifa;
1659
1660 break;
1661 }
1662 }
1663 }
1664out:
c0b8da1e 1665 return hiscore_idx;
9131f3de
YH		 1666}
1667
afbac601
DA		 1668static int ipv6_get_saddr_master(struct net *net,
1669 const struct net_device *dst_dev,
1670 const struct net_device *master,
1671 struct ipv6_saddr_dst *dst,
1672 struct ipv6_saddr_score *scores,
1673 int hiscore_idx)
1674{
1675 struct inet6_dev *idev;
1676
1677 idev = __in6_dev_get(dst_dev);
1678 if (idev)
1679 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev,
1680 scores, hiscore_idx);
1681
1682 idev = __in6_dev_get(master);
1683 if (idev)
1684 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev,
1685 scores, hiscore_idx);
1686
1687 return hiscore_idx;
1688}
1689
b3f644fc 1690int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev,
9acd9f3a 1691 const struct in6_addr *daddr, unsigned int prefs,
7cbca67c 1692 struct in6_addr *saddr)
1da177e4 1693{
c0b8da1e 1694 struct ipv6_saddr_score scores[2], *hiscore;
a9b05723 1695 struct ipv6_saddr_dst dst;
9131f3de 1696 struct inet6_dev *idev;
072047e4 1697 struct net_device *dev;
a9b05723 1698 int dst_type;
9131f3de 1699 bool use_oif_addr = false;
c0b8da1e 1700 int hiscore_idx = 0;
cc429c8f 1701 int ret = 0;
1da177e4 1702
a9b05723
YH		 1703 dst_type = __ipv6_addr_type(daddr);
1704 dst.addr = daddr;
1705 dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1706 dst.scope = __ipv6_addr_src_scope(dst_type);
3de23255 1707 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
7cbca67c 1708 dst.prefs = prefs;
a9b05723 1709
c0b8da1e
YH		 1710 scores[hiscore_idx].rule = -1;
1711 scores[hiscore_idx].ifa = NULL;
1da177e4 1712
8814c4b5 1713 rcu_read_lock();
1da177e4 1714
9131f3de
YH		 1715 /* Candidate Source Address (section 4)
1716 * - multicast and link-local destination address,
1717 * the set of candidate source address MUST only
1718 * include addresses assigned to interfaces
1719 * belonging to the same link as the outgoing
1720 * interface.
1721 * (- For site-local destination addresses, the
1722 * set of candidate source addresses MUST only
1723 * include addresses assigned to interfaces
1724 * belonging to the same site as the outgoing
1725 * interface.)
3985e8a3
EK		 1726 * - "It is RECOMMENDED that the candidate source addresses
1727 * be the set of unicast addresses assigned to the
1728 * interface that will be used to send to the destination
1729 * (the 'outgoing' interface)." (RFC 6724)
9131f3de
YH		 1730 */
1731 if (dst_dev) {
3985e8a3 1732 idev = __in6_dev_get(dst_dev);
9131f3de 1733 if ((dst_type & IPV6_ADDR_MULTICAST) ||
3985e8a3
EK		 1734 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL ||
1735 (idev && idev->cnf.use_oif_addrs_only)) {
9131f3de
YH		 1736 use_oif_addr = true;
1737 }
1738 }
a9b05723 1739
9131f3de 1740 if (use_oif_addr) {
c0b8da1e 1741 if (idev)
c15df306 1742 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx);
9131f3de 1743 } else {
afbac601
DA		 1744 const struct net_device *master;
1745 int master_idx = 0;
1746
1747 /* if dst_dev exists and is enslaved to an L3 device, then
1748 * prefer addresses from dst_dev and then the master over
1749 * any other enslaved devices in the L3 domain.
1750 */
1751 master = l3mdev_master_dev_rcu(dst_dev);
1752 if (master) {
1753 master_idx = master->ifindex;
1754
1755 hiscore_idx = ipv6_get_saddr_master(net, dst_dev,
1756 master, &dst,
1757 scores, hiscore_idx);
1758
1759 if (scores[hiscore_idx].ifa)
1760 goto out;
1761 }
1762
9131f3de 1763 for_each_netdev_rcu(net, dev) {
afbac601
DA		 1764 /* only consider addresses on devices in the
1765 * same L3 domain
1766 */
1767 if (l3mdev_master_ifindex_rcu(dev) != master_idx)
1768 continue;
9131f3de
YH		 1769 idev = __in6_dev_get(dev);
1770 if (!idev)
072047e4 1771 continue;
c15df306 1772 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx);
1da177e4
LT		 1773 }
1774 }
afbac601
DA		 1775
1776out:
c0b8da1e 1777 hiscore = &scores[hiscore_idx];
a9b05723 1778 if (!hiscore->ifa)
cc429c8f
ED		 1779 ret = -EADDRNOTAVAIL;
1780 else
1781 *saddr = hiscore->ifa->addr;
1ab1457c 1782
cc429c8f
ED		 1783 rcu_read_unlock();
1784 return ret;
1da177e4 1785}
5e5f3f0f 1786EXPORT_SYMBOL(ipv6_dev_get_saddr);
1da177e4 1787
8965779d 1788int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr,
479840ff 1789 u32 banned_flags)
b7b1bfce
HFS		 1790{
1791 struct inet6_ifaddr *ifp;
1792 int err = -EADDRNOTAVAIL;
1793
602582ca
HFS		 1794 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
1795 if (ifp->scope > IFA_LINK)
1796 break;
b7b1bfce
HFS		 1797 if (ifp->scope == IFA_LINK &&
1798 !(ifp->flags & banned_flags)) {
1799 *addr = ifp->addr;
1800 err = 0;
1801 break;
1802 }
1803 }
1804 return err;
1805}
1806
95c385b4 1807int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
479840ff 1808 u32 banned_flags)
1da177e4
LT		 1809{
1810 struct inet6_dev *idev;
1811 int err = -EADDRNOTAVAIL;
1812
8814c4b5 1813 rcu_read_lock();
e21e8467
SH		 1814 idev = __in6_dev_get(dev);
1815 if (idev) {
1da177e4 1816 read_lock_bh(&idev->lock);
b7b1bfce 1817 err = __ipv6_get_lladdr(idev, addr, banned_flags);
1da177e4
LT		 1818 read_unlock_bh(&idev->lock);
1819 }
8814c4b5 1820 rcu_read_unlock();
1da177e4
LT		 1821 return err;
1822}
1823
d9bf82c2 1824static int ipv6_count_addresses(const struct inet6_dev *idev)
1da177e4 1825{
d9bf82c2 1826 const struct inet6_ifaddr *ifp;
1da177e4 1827 int cnt = 0;
1da177e4 1828
d9bf82c2
ED		 1829 rcu_read_lock();
1830 list_for_each_entry_rcu(ifp, &idev->addr_list, if_list)
1da177e4 1831 cnt++;
d9bf82c2 1832 rcu_read_unlock();
1da177e4
LT		 1833 return cnt;
1834}
1835
b71d1d42 1836int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
2a7851bf 1837 const struct net_device *dev, int strict)
c58da4c6
EK		 1838{
1839 return ipv6_chk_addr_and_flags(net, addr, dev, strict, IFA_F_TENTATIVE);
1840}
1841EXPORT_SYMBOL(ipv6_chk_addr);
1842
1843int ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr,
1844 const struct net_device *dev, int strict,
1845 u32 banned_flags)
1da177e4 1846{
3f27fb23 1847 unsigned int hash = inet6_addr_hash(net, addr);
eedf042a 1848 struct inet6_ifaddr *ifp;
c58da4c6 1849 u32 ifp_flags;
1da177e4 1850
480318a0 1851 rcu_read_lock();
b67bfe0d 1852 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
878628fb 1853 if (!net_eq(dev_net(ifp->idev->dev), net))
bfeade08 1854 continue;
c58da4c6
EK		 1855 /* Decouple optimistic from tentative for evaluation here.
1856 * Ban optimistic addresses explicitly, when required.
1857 */
1858 ifp_flags = (ifp->flags&IFA_F_OPTIMISTIC)
1859 ? (ifp->flags&~IFA_F_TENTATIVE)
1860 : ifp->flags;
1da177e4 1861 if (ipv6_addr_equal(&ifp->addr, addr) &&
c58da4c6 1862 !(ifp_flags&banned_flags) &&
63159f29 1863 (!dev || ifp->idev->dev == dev ||
eedf042a 1864 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) {
480318a0 1865 rcu_read_unlock();
eedf042a 1866 return 1;
1da177e4
LT		 1867 }
1868 }
5c578aed 1869
480318a0 1870 rcu_read_unlock();
eedf042a 1871 return 0;
1da177e4 1872}
c58da4c6 1873EXPORT_SYMBOL(ipv6_chk_addr_and_flags);
7159039a 1874
1da177e4 1875
7df37ff3
CB		 1876/* Compares an address/prefix_len with addresses on device @dev.
1877 * If one is found it returns true.
1878 */
1879bool ipv6_chk_custom_prefix(const struct in6_addr *addr,
1880 const unsigned int prefix_len, struct net_device *dev)
1881{
47e26941
ED		 1882 const struct inet6_ifaddr *ifa;
1883 const struct inet6_dev *idev;
7df37ff3
CB		 1884 bool ret = false;
1885
1886 rcu_read_lock();
1887 idev = __in6_dev_get(dev);
1888 if (idev) {
47e26941 1889 list_for_each_entry_rcu(ifa, &idev->addr_list, if_list) {
7df37ff3
CB		 1890 ret = ipv6_prefix_equal(addr, &ifa->addr, prefix_len);
1891 if (ret)
1892 break;
1893 }
7df37ff3
CB		 1894 }
1895 rcu_read_unlock();
1896
1897 return ret;
1898}
1899EXPORT_SYMBOL(ipv6_chk_custom_prefix);
1900
b71d1d42 1901int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev)
52eeeb84 1902{
24ba333b
ED		 1903 const struct inet6_ifaddr *ifa;
1904 const struct inet6_dev *idev;
52eeeb84
YH		 1905 int onlink;
1906
1907 onlink = 0;
1908 rcu_read_lock();
1909 idev = __in6_dev_get(dev);
1910 if (idev) {
24ba333b 1911 list_for_each_entry_rcu(ifa, &idev->addr_list, if_list) {
52eeeb84
YH		 1912 onlink = ipv6_prefix_equal(addr, &ifa->addr,
1913 ifa->prefix_len);
1914 if (onlink)
1915 break;
1916 }
52eeeb84
YH		 1917 }
1918 rcu_read_unlock();
1919 return onlink;
1920}
52eeeb84
YH		 1921EXPORT_SYMBOL(ipv6_chk_prefix);
1922
9acd9f3a 1923struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1cab3da6 1924 struct net_device *dev, int strict)
1da177e4 1925{
3f27fb23 1926 unsigned int hash = inet6_addr_hash(net, addr);
b79d1d54 1927 struct inet6_ifaddr *ifp, *result = NULL;
1da177e4 1928
24f226da
ED		 1929 rcu_read_lock();
1930 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
878628fb 1931 if (!net_eq(dev_net(ifp->idev->dev), net))
1cab3da6 1932 continue;
1da177e4 1933 if (ipv6_addr_equal(&ifp->addr, addr)) {
63159f29 1934 if (!dev || ifp->idev->dev == dev ||
1da177e4 1935 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
b79d1d54 1936 result = ifp;
1da177e4
LT		 1937 in6_ifa_hold(ifp);
1938 break;
1939 }
1940 }
1941 }
24f226da 1942 rcu_read_unlock();
1da177e4 1943
b79d1d54 1944 return result;
1da177e4
LT		 1945}
1946
1da177e4
LT		 1947/* Gets referenced address, destroys ifaddr */
1948
cc411d0b 1949static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
1da177e4 1950{
3d171f39
LR		 1951 if (dad_failed)
1952 ifp->flags |= IFA_F_DADFAILED;
1953
ec8add2a 1954 if (ifp->flags&IFA_F_TEMPORARY) {
1da177e4
LT		 1955 struct inet6_ifaddr *ifpub;
1956 spin_lock_bh(&ifp->lock);
1957 ifpub = ifp->ifpub;
1958 if (ifpub) {
1959 in6_ifa_hold(ifpub);
1960 spin_unlock_bh(&ifp->lock);
fffcefe9 1961 ipv6_create_tempaddr(ifpub, ifp, true);
1da177e4
LT		 1962 in6_ifa_put(ifpub);
1963 } else {
1964 spin_unlock_bh(&ifp->lock);
1965 }
1966 ipv6_del_addr(ifp);
ec8add2a
SD		 1967 } else if (ifp->flags&IFA_F_PERMANENT || !dad_failed) {
1968 spin_lock_bh(&ifp->lock);
1969 addrconf_del_dad_work(ifp);
1970 ifp->flags |= IFA_F_TENTATIVE;
1971 spin_unlock_bh(&ifp->lock);
1972 if (dad_failed)
1973 ipv6_ifa_notify(0, ifp);
1974 in6_ifa_put(ifp);
c15b1cca 1975 } else {
1da177e4 1976 ipv6_del_addr(ifp);
c15b1cca 1977 }
1da177e4
LT		 1978}
1979
f2344a13
HX		 1980static int addrconf_dad_end(struct inet6_ifaddr *ifp)
1981{
1982 int err = -ENOENT;
1983
8e8e676d 1984 spin_lock_bh(&ifp->lock);
f2344a13
HX		 1985 if (ifp->state == INET6_IFADDR_STATE_DAD) {
1986 ifp->state = INET6_IFADDR_STATE_POSTDAD;
1987 err = 0;
1988 }
8e8e676d 1989 spin_unlock_bh(&ifp->lock);
f2344a13
HX		 1990
1991 return err;
1992}
1993
da13c59b 1994void addrconf_dad_failure(struct sk_buff *skb, struct inet6_ifaddr *ifp)
3c21edbd 1995{
1b34be74 1996 struct inet6_dev *idev = ifp->idev;
1855b7c3 1997 struct net *net = dev_net(ifp->idev->dev);
9bdd8d40 1998
853dc2e0
UB		 1999 if (addrconf_dad_end(ifp)) {
2000 in6_ifa_put(ifp);
f2344a13 2001 return;
853dc2e0 2002 }
f2344a13 2003
da13c59b
VP		 2004 net_info_ratelimited("%s: IPv6 duplicate address %pI6c used by %pM detected!\n",
2005 ifp->idev->dev->name, &ifp->addr, eth_hdr(skb)->h_source);
9bdd8d40 2006
5f40ef77
HFS		 2007 spin_lock_bh(&ifp->lock);
2008
2009 if (ifp->flags & IFA_F_STABLE_PRIVACY) {
2010 int scope = ifp->scope;
2011 u32 flags = ifp->flags;
2012 struct in6_addr new_addr;
2013 struct inet6_ifaddr *ifp2;
2014 u32 valid_lft, preferred_lft;
2015 int pfxlen = ifp->prefix_len;
5f40ef77
HFS		 2016 int retries = ifp->stable_privacy_retry + 1;
2017
1855b7c3 2018 if (retries > net->ipv6.sysctl.idgen_retries) {
5f40ef77
HFS		 2019 net_info_ratelimited("%s: privacy stable address generation failed because of DAD conflicts!\n",
2020 ifp->idev->dev->name);
2021 goto errdad;
2022 }
2023
2024 new_addr = ifp->addr;
2025 if (ipv6_generate_stable_address(&new_addr, retries,
2026 idev))
2027 goto errdad;
2028
2029 valid_lft = ifp->valid_lft;
2030 preferred_lft = ifp->prefered_lft;
2031
2032 spin_unlock_bh(&ifp->lock);
1b34be74 2033
5f40ef77
HFS		 2034 if (idev->cnf.max_addresses &&
2035 ipv6_count_addresses(idev) >=
2036 idev->cnf.max_addresses)
2037 goto lock_errdad;
2038
2039 net_info_ratelimited("%s: generating new stable privacy address because of DAD conflict\n",
2040 ifp->idev->dev->name);
2041
2042 ifp2 = ipv6_add_addr(idev, &new_addr, NULL, pfxlen,
2043 scope, flags, valid_lft,
de95e047 2044 preferred_lft, false, NULL);
5f40ef77
HFS		 2045 if (IS_ERR(ifp2))
2046 goto lock_errdad;
2047
2048 spin_lock_bh(&ifp2->lock);
2049 ifp2->stable_privacy_retry = retries;
2050 ifp2->state = INET6_IFADDR_STATE_PREDAD;
2051 spin_unlock_bh(&ifp2->lock);
2052
1855b7c3 2053 addrconf_mod_dad_work(ifp2, net->ipv6.sysctl.idgen_delay);
5f40ef77
HFS		 2054 in6_ifa_put(ifp2);
2055lock_errdad:
2056 spin_lock_bh(&ifp->lock);
1b34be74
YH		 2057 }
2058
5f40ef77 2059errdad:
c15b1cca
HFS		 2060 /* transition from _POSTDAD to _ERRDAD */
2061 ifp->state = INET6_IFADDR_STATE_ERRDAD;
8e8e676d 2062 spin_unlock_bh(&ifp->lock);
c15b1cca
HFS		 2063
2064 addrconf_mod_dad_work(ifp, 0);
751eb6b6 2065 in6_ifa_put(ifp);
3c21edbd 2066}
1da177e4 2067
a9ed4a29
SD		 2068/* Join to solicited addr multicast group.
2069 * caller must hold RTNL */
b71d1d42 2070void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr)
1da177e4
LT		 2071{
2072 struct in6_addr maddr;
2073
2074 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
2075 return;
2076
2077 addrconf_addr_solict_mult(addr, &maddr);
2078 ipv6_dev_mc_inc(dev, &maddr);
2079}
2080
a9ed4a29 2081/* caller must hold RTNL */
b71d1d42 2082void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr)
1da177e4
LT		 2083{
2084 struct in6_addr maddr;
2085
2086 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
2087 return;
2088
2089 addrconf_addr_solict_mult(addr, &maddr);
2090 __ipv6_dev_mc_dec(idev, &maddr);
2091}
2092
a9ed4a29 2093/* caller must hold RTNL */
20380731 2094static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1da177e4
LT		 2095{
2096 struct in6_addr addr;
c15b1cca 2097
88ad3149 2098 if (ifp->prefix_len >= 127) /* RFC 6164 */
2bda8a0c 2099 return;
1da177e4
LT		 2100 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
2101 if (ipv6_addr_any(&addr))
2102 return;
013b4d90 2103 __ipv6_dev_ac_inc(ifp->idev, &addr);
1da177e4
LT		 2104}
2105
a9ed4a29 2106/* caller must hold RTNL */
20380731 2107static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1da177e4
LT		 2108{
2109 struct in6_addr addr;
c15b1cca 2110
88ad3149 2111 if (ifp->prefix_len >= 127) /* RFC 6164 */
32019e65 2112 return;
1da177e4
LT		 2113 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
2114 if (ipv6_addr_any(&addr))
2115 return;
2116 __ipv6_dev_ac_dec(ifp->idev, &addr);
2117}
2118
8a7a4b47 2119static int addrconf_ifid_6lowpan(u8 *eui, struct net_device *dev)
06a4c1c5 2120{
8a7a4b47
AA		 2121 switch (dev->addr_len) {
2122 case ETH_ALEN:
9dae2e03
LAD		 2123 memcpy(eui, dev->dev_addr, 3);
2124 eui[3] = 0xFF;
2125 eui[4] = 0xFE;
2126 memcpy(eui + 5, dev->dev_addr + 3, 3);
2127 break;
8a7a4b47
AA		 2128 case EUI64_ADDR_LEN:
2129 memcpy(eui, dev->dev_addr, EUI64_ADDR_LEN);
2130 eui[0] ^= 2;
2131 break;
2132 default:
06a4c1c5 2133 return -1;
8a7a4b47
AA		 2134 }
2135
06a4c1c5 2136 return 0;
2137}
2138
cb6bf355
YH		 2139static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev)
2140{
2141 union fwnet_hwaddr *ha;
2142
2143 if (dev->addr_len != FWNET_ALEN)
2144 return -1;
2145
2146 ha = (union fwnet_hwaddr *)dev->dev_addr;
2147
2148 memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id));
2149 eui[0] ^= 2;
2150 return 0;
2151}
2152
073a8e0e
YH		 2153static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
2154{
2155 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
2156 if (dev->addr_len != ARCNET_ALEN)
2157 return -1;
2158 memset(eui, 0, 7);
8e5e8f30 2159 eui[7] = *(u8 *)dev->dev_addr;
073a8e0e
YH		 2160 return 0;
2161}
2162
2163static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
2164{
2165 if (dev->addr_len != INFINIBAND_ALEN)
2166 return -1;
2167 memcpy(eui, dev->dev_addr + 12, 8);
2168 eui[0] |= 2;
2169 return 0;
2170}
2171
c61393ea 2172static int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
dfd982ba 2173{
9af28511
SH		 2174 if (addr == 0)
2175 return -1;
dfd982ba
YH		 2176 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
2177 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
2178 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
2179 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
2180 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
2181 ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
2182 eui[1] = 0;
2183 eui[2] = 0x5E;
2184 eui[3] = 0xFE;
2185 memcpy(eui + 4, &addr, 4);
2186 return 0;
2187}
dfd982ba
YH		 2188
2189static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
2190{
2191 if (dev->priv_flags & IFF_ISATAP)
2192 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
2193 return -1;
2194}
2195
aee80b54 2196static int addrconf_ifid_gre(u8 *eui, struct net_device *dev)
2197{
2198 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
2199}
2200
e837735e
ND		 2201static int addrconf_ifid_ip6tnl(u8 *eui, struct net_device *dev)
2202{
2203 memcpy(eui, dev->perm_addr, 3);
2204 memcpy(eui + 5, dev->perm_addr + 3, 3);
2205 eui[3] = 0xFF;
2206 eui[4] = 0xFE;
2207 eui[0] ^= 2;
2208 return 0;
2209}
2210
1da177e4
LT		 2211static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
2212{
2213 switch (dev->type) {
2214 case ARPHRD_ETHER:
2215 case ARPHRD_FDDI:
073a8e0e 2216 return addrconf_ifid_eui48(eui, dev);
1da177e4 2217 case ARPHRD_ARCNET:
073a8e0e 2218 return addrconf_ifid_arcnet(eui, dev);
1da177e4 2219 case ARPHRD_INFINIBAND:
073a8e0e 2220 return addrconf_ifid_infiniband(eui, dev);
c7dc89c0 2221 case ARPHRD_SIT:
dfd982ba 2222 return addrconf_ifid_sit(eui, dev);
aee80b54 2223 case ARPHRD_IPGRE:
45ce0fd1 2224 case ARPHRD_TUNNEL:
aee80b54 2225 return addrconf_ifid_gre(eui, dev);
e74bccb8 2226 case ARPHRD_6LOWPAN:
8a7a4b47 2227 return addrconf_ifid_6lowpan(eui, dev);
cb6bf355
YH		 2228 case ARPHRD_IEEE1394:
2229 return addrconf_ifid_ieee1394(eui, dev);
e837735e 2230 case ARPHRD_TUNNEL6:
45ce0fd1 2231 case ARPHRD_IP6GRE:
e837735e 2232 return addrconf_ifid_ip6tnl(eui, dev);
1da177e4
LT		 2233 }
2234 return -1;
2235}
2236
2237static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
2238{
2239 int err = -1;
2240 struct inet6_ifaddr *ifp;
2241
2242 read_lock_bh(&idev->lock);
602582ca
HFS		 2243 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
2244 if (ifp->scope > IFA_LINK)
2245 break;
1da177e4
LT		 2246 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
2247 memcpy(eui, ifp->addr.s6_addr+8, 8);
2248 err = 0;
2249 break;
2250 }
2251 }
2252 read_unlock_bh(&idev->lock);
2253 return err;
2254}
2255
1da177e4 2256/* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
9d6280da 2257static void ipv6_regen_rndid(struct inet6_dev *idev)
1da177e4 2258{
1da177e4 2259regen:
955189ef 2260 get_random_bytes(idev->rndid, sizeof(idev->rndid));
1da177e4 2261 idev->rndid[0] &= ~0x02;
1da177e4
LT		 2262
2263 /*
2264 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
2265 * check if generated address is not inappropriate
2266 *
2267 * - Reserved subnet anycast (RFC 2526)
2268 * 11111101 11....11 1xxxxxxx
c7dc89c0 2269 * - ISATAP (RFC4214) 6.1
1da177e4
LT		 2270 * 00-00-5E-FE-xx-xx-xx-xx
2271 * - value 0
2272 * - XXX: already assigned to an address on the device
2273 */
1ab1457c 2274 if (idev->rndid[0] == 0xfd &&
1da177e4
LT		 2275 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
2276 (idev->rndid[7]&0x80))
2277 goto regen;
2278 if ((idev->rndid[0]|idev->rndid[1]) == 0) {
2279 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
2280 goto regen;
2281 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
2282 goto regen;
2283 }
1da177e4
LT		 2284}
2285
9d6280da 2286static void ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr)
8e5e8f30 2287{
1da177e4 2288 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
9d6280da 2289 ipv6_regen_rndid(idev);
1da177e4 2290}
1da177e4
LT		 2291
2292/*
2293 * Add prefix route.
2294 */
2295
2296static void
2297addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
e431b8c0 2298 unsigned long expires, u32 flags)
1da177e4 2299{
86872cb5 2300 struct fib6_config cfg = {
ca254490 2301 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX,
86872cb5
TG		 2302 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2303 .fc_ifindex = dev->ifindex,
2304 .fc_expires = expires,
2305 .fc_dst_len = plen,
2306 .fc_flags = RTF_UP | flags,
c346dca1 2307 .fc_nlinfo.nl_net = dev_net(dev),
f410a1fb 2308 .fc_protocol = RTPROT_KERNEL,
86872cb5 2309 };
1da177e4 2310
4e3fd7a0 2311 cfg.fc_dst = *pfx;
1da177e4
LT		 2312
2313 /* Prevent useless cloning on PtP SIT.
2314 This thing is done here expecting that the whole
2315 class of non-broadcast devices need not cloning.
2316 */
07a93626 2317#if IS_ENABLED(CONFIG_IPV6_SIT)
86872cb5
TG		 2318 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
2319 cfg.fc_flags |= RTF_NONEXTHOP;
0be669bb 2320#endif
1da177e4 2321
333c4301 2322 ip6_route_add(&cfg, NULL);
1da177e4
LT		 2323}
2324
14ef37b6
AH		 2325
2326static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
2327 int plen,
2328 const struct net_device *dev,
2329 u32 flags, u32 noflags)
2330{
2331 struct fib6_node *fn;
2332 struct rt6_info *rt = NULL;
2333 struct fib6_table *table;
ca254490 2334 u32 tb_id = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX;
14ef37b6 2335
ca254490 2336 table = fib6_get_table(dev_net(dev), tb_id);
63159f29 2337 if (!table)
14ef37b6
AH		 2338 return NULL;
2339
66f5d6ce 2340 rcu_read_lock();
38fbeeee 2341 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0, true);
14ef37b6
AH		 2342 if (!fn)
2343 goto out;
1f56a01f 2344
66f5d6ce 2345 for_each_fib6_node_rt_rcu(fn) {
d1918542 2346 if (rt->dst.dev->ifindex != dev->ifindex)
14ef37b6
AH		 2347 continue;
2348 if ((rt->rt6i_flags & flags) != flags)
2349 continue;
85da53bf 2350 if ((rt->rt6i_flags & noflags) != 0)
14ef37b6 2351 continue;
d3843fe5
WW		 2352 if (!dst_hold_safe(&rt->dst))
2353 rt = NULL;
14ef37b6
AH		 2354 break;
2355 }
2356out:
66f5d6ce 2357 rcu_read_unlock();
14ef37b6
AH		 2358 return rt;
2359}
2360
2361
1da177e4
LT		 2362/* Create "default" multicast route to the interface */
2363
2364static void addrconf_add_mroute(struct net_device *dev)
2365{
86872cb5 2366 struct fib6_config cfg = {
ca254490 2367 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_LOCAL,
86872cb5
TG		 2368 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2369 .fc_ifindex = dev->ifindex,
2370 .fc_dst_len = 8,
2371 .fc_flags = RTF_UP,
c346dca1 2372 .fc_nlinfo.nl_net = dev_net(dev),
86872cb5
TG		 2373 };
2374
2375 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
2376
333c4301 2377 ip6_route_add(&cfg, NULL);
1da177e4
LT		 2378}
2379
1da177e4
LT		 2380static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
2381{
2382 struct inet6_dev *idev;
2383
2384 ASSERT_RTNL();
2385
e21e8467
SH		 2386 idev = ipv6_find_idev(dev);
2387 if (!idev)
64e724f6
BH		 2388 return ERR_PTR(-ENOBUFS);
2389
2390 if (idev->cnf.disable_ipv6)
2391 return ERR_PTR(-EACCES);
1da177e4
LT		 2392
2393 /* Add default multicast route */
ba46ee4c 2394 if (!(dev->flags & IFF_LOOPBACK) && !netif_is_l3_master(dev))
4af04aba 2395 addrconf_add_mroute(dev);
1da177e4 2396
1da177e4
LT		 2397 return idev;
2398}
2399
53bd6749
JP		 2400static void manage_tempaddrs(struct inet6_dev *idev,
2401 struct inet6_ifaddr *ifp,
2402 __u32 valid_lft, __u32 prefered_lft,
2403 bool create, unsigned long now)
2404{
2405 u32 flags;
2406 struct inet6_ifaddr *ift;
2407
2408 read_lock_bh(&idev->lock);
2409 /* update all temporary addresses in the list */
2410 list_for_each_entry(ift, &idev->tempaddr_list, tmp_list) {
2411 int age, max_valid, max_prefered;
2412
2413 if (ifp != ift->ifpub)
2414 continue;
2415
2416 /* RFC 4941 section 3.3:
2417 * If a received option will extend the lifetime of a public
2418 * address, the lifetimes of temporary addresses should
2419 * be extended, subject to the overall constraint that no
2420 * temporary addresses should ever remain "valid" or "preferred"
2421 * for a time longer than (TEMP_VALID_LIFETIME) or
2422 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), respectively.
2423 */
2424 age = (now - ift->cstamp) / HZ;
2425 max_valid = idev->cnf.temp_valid_lft - age;
2426 if (max_valid < 0)
2427 max_valid = 0;
2428
2429 max_prefered = idev->cnf.temp_prefered_lft -
76506a98 2430 idev->desync_factor - age;
53bd6749
JP		 2431 if (max_prefered < 0)
2432 max_prefered = 0;
2433
2434 if (valid_lft > max_valid)
2435 valid_lft = max_valid;
2436
2437 if (prefered_lft > max_prefered)
2438 prefered_lft = max_prefered;
2439
2440 spin_lock(&ift->lock);
2441 flags = ift->flags;
2442 ift->valid_lft = valid_lft;
2443 ift->prefered_lft = prefered_lft;
2444 ift->tstamp = now;
2445 if (prefered_lft > 0)
2446 ift->flags &= ~IFA_F_DEPRECATED;
2447
2448 spin_unlock(&ift->lock);
2449 if (!(flags&IFA_F_TENTATIVE))
2450 ipv6_ifa_notify(0, ift);
2451 }
2452
2453 if ((create || list_empty(&idev->tempaddr_list)) &&
2454 idev->cnf.use_tempaddr > 0) {
2455 /* When a new public address is created as described
2456 * in [ADDRCONF], also create a new temporary address.
2457 * Also create a temporary address if it's enabled but
2458 * no temporary address currently exists.
2459 */
2460 read_unlock_bh(&idev->lock);
fffcefe9 2461 ipv6_create_tempaddr(ifp, NULL, false);
53bd6749
JP		 2462 } else {
2463 read_unlock_bh(&idev->lock);
2464 }
2465}
2466
cc9da6cc
BM		 2467static bool is_addr_mode_generate_stable(struct inet6_dev *idev)
2468{
d35a00b8
FJ		 2469 return idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY ||
2470 idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_RANDOM;
cc9da6cc
BM		 2471}
2472
cc84b3c6
AA		 2473int addrconf_prefix_rcv_add_addr(struct net *net, struct net_device *dev,
2474 const struct prefix_info *pinfo,
2475 struct inet6_dev *in6_dev,
2476 const struct in6_addr *addr, int addr_type,
2477 u32 addr_flags, bool sllao, bool tokenized,
2478 __u32 valid_lft, u32 prefered_lft)
4f672235
AA		 2479{
2480 struct inet6_ifaddr *ifp = ipv6_get_ifaddr(net, addr, dev, 1);
2481 int create = 0, update_lft = 0;
2482
2483 if (!ifp && valid_lft) {
2484 int max_addresses = in6_dev->cnf.max_addresses;
2485
2486#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
35e015e1
MC		 2487 if ((net->ipv6.devconf_all->optimistic_dad ||
2488 in6_dev->cnf.optimistic_dad) &&
4f672235
AA		 2489 !net->ipv6.devconf_all->forwarding && sllao)
2490 addr_flags |= IFA_F_OPTIMISTIC;
2491#endif
2492
2493 /* Do not allow to create too much of autoconfigured
2494 * addresses; this would be too easy way to crash kernel.
2495 */
2496 if (!max_addresses ||
2497 ipv6_count_addresses(in6_dev) < max_addresses)
2498 ifp = ipv6_add_addr(in6_dev, addr, NULL,
2499 pinfo->prefix_len,
2500 addr_type&IPV6_ADDR_SCOPE_MASK,
2501 addr_flags, valid_lft,
de95e047 2502 prefered_lft, false, NULL);
4f672235
AA		 2503
2504 if (IS_ERR_OR_NULL(ifp))
2505 return -1;
2506
2507 update_lft = 0;
2508 create = 1;
2509 spin_lock_bh(&ifp->lock);
2510 ifp->flags |= IFA_F_MANAGETEMPADDR;
2511 ifp->cstamp = jiffies;
2512 ifp->tokenized = tokenized;
2513 spin_unlock_bh(&ifp->lock);
2514 addrconf_dad_start(ifp);
2515 }
2516
2517 if (ifp) {
2518 u32 flags;
2519 unsigned long now;
2520 u32 stored_lft;
2521
2522 /* update lifetime (RFC2462 5.5.3 e) */
2523 spin_lock_bh(&ifp->lock);
2524 now = jiffies;
2525 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
2526 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
2527 else
2528 stored_lft = 0;
2529 if (!update_lft && !create && stored_lft) {
2530 const u32 minimum_lft = min_t(u32,
2531 stored_lft, MIN_VALID_LIFETIME);
2532 valid_lft = max(valid_lft, minimum_lft);
2533
2534 /* RFC4862 Section 5.5.3e:
2535 * "Note that the preferred lifetime of the
2536 * corresponding address is always reset to
2537 * the Preferred Lifetime in the received
2538 * Prefix Information option, regardless of
2539 * whether the valid lifetime is also reset or
2540 * ignored."
2541 *
2542 * So we should always update prefered_lft here.
2543 */
2544 update_lft = 1;
2545 }
2546
2547 if (update_lft) {
2548 ifp->valid_lft = valid_lft;
2549 ifp->prefered_lft = prefered_lft;
2550 ifp->tstamp = now;
2551 flags = ifp->flags;
2552 ifp->flags &= ~IFA_F_DEPRECATED;
2553 spin_unlock_bh(&ifp->lock);
2554
2555 if (!(flags&IFA_F_TENTATIVE))
2556 ipv6_ifa_notify(0, ifp);
2557 } else
2558 spin_unlock_bh(&ifp->lock);
2559
2560 manage_tempaddrs(in6_dev, ifp, valid_lft, prefered_lft,
2561 create, now);
2562
2563 in6_ifa_put(ifp);
2564 addrconf_verify();
2565 }
2566
2567 return 0;
2568}
cc84b3c6 2569EXPORT_SYMBOL_GPL(addrconf_prefix_rcv_add_addr);
4f672235 2570
e6bff995 2571void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao)
1da177e4
LT		 2572{
2573 struct prefix_info *pinfo;
2574 __u32 valid_lft;
2575 __u32 prefered_lft;
4f672235 2576 int addr_type, err;
64236f3f 2577 u32 addr_flags = 0;
1da177e4 2578 struct inet6_dev *in6_dev;
56d417b1 2579 struct net *net = dev_net(dev);
1da177e4
LT		 2580
2581 pinfo = (struct prefix_info *) opt;
1ab1457c 2582
1da177e4 2583 if (len < sizeof(struct prefix_info)) {
ba3542e1 2584 ADBG("addrconf: prefix option too short\n");
1da177e4
LT		 2585 return;
2586 }
1ab1457c 2587
1da177e4
LT		 2588 /*
2589 * Validation checks ([ADDRCONF], page 19)
2590 */
2591
2592 addr_type = ipv6_addr_type(&pinfo->prefix);
2593
2594 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
2595 return;
2596
2597 valid_lft = ntohl(pinfo->valid);
2598 prefered_lft = ntohl(pinfo->prefered);
2599
2600 if (prefered_lft > valid_lft) {
e87cc472 2601 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n");
1da177e4
LT		 2602 return;
2603 }
2604
2605 in6_dev = in6_dev_get(dev);
2606
63159f29 2607 if (!in6_dev) {
e87cc472
JP		 2608 net_dbg_ratelimited("addrconf: device %s not configured\n",
2609 dev->name);
1da177e4
LT		 2610 return;
2611 }
2612
2613 /*
2614 * Two things going on here:
2615 * 1) Add routes for on-link prefixes
2616 * 2) Configure prefixes with the auto flag set
2617 */
2618
4bed72e4
YH		 2619 if (pinfo->onlink) {
2620 struct rt6_info *rt;
2621 unsigned long rt_expires;
2622
6f704992
YH		 2623 /* Avoid arithmetic overflow. Really, we could
2624 * save rt_expires in seconds, likely valid_lft,
2625 * but it would require division in fib gc, that it
2626 * not good.
2627 */
4bed72e4
YH		 2628 if (HZ > USER_HZ)
2629 rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
2630 else
2631 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
3dd4bc68 2632
4bed72e4
YH		 2633 if (addrconf_finite_timeout(rt_expires))
2634 rt_expires *= HZ;
1da177e4 2635
14ef37b6
AH		 2636 rt = addrconf_get_prefix_route(&pinfo->prefix,
2637 pinfo->prefix_len,
2638 dev,
2639 RTF_ADDRCONF | RTF_PREFIX_RT,
2640 RTF_GATEWAY | RTF_DEFAULT);
1da177e4 2641
14ef37b6 2642 if (rt) {
6f704992
YH		 2643 /* Autoconf prefix route */
2644 if (valid_lft == 0) {
2645 ip6_del_rt(rt);
2646 rt = NULL;
4bed72e4 2647 } else if (addrconf_finite_timeout(rt_expires)) {
6f704992 2648 /* not infinity */
1716a961 2649 rt6_set_expires(rt, jiffies + rt_expires);
6f704992 2650 } else {
1716a961 2651 rt6_clean_expires(rt);
1da177e4
LT		 2652 }
2653 } else if (valid_lft) {
6f704992 2654 clock_t expires = 0;
4bed72e4
YH		 2655 int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
2656 if (addrconf_finite_timeout(rt_expires)) {
6f704992
YH		 2657 /* not infinity */
2658 flags |= RTF_EXPIRES;
2659 expires = jiffies_to_clock_t(rt_expires);
2660 }
1da177e4 2661 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
6f704992 2662 dev, expires, flags);
1da177e4 2663 }
94e187c0 2664 ip6_rt_put(rt);
1da177e4
LT		 2665 }
2666
2667 /* Try to figure out our local address for this prefix */
2668
2669 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
1da177e4 2670 struct in6_addr addr;
f997c55c 2671 bool tokenized = false, dev_addr_generated = false;
1da177e4
LT		 2672
2673 if (pinfo->prefix_len == 64) {
2674 memcpy(&addr, &pinfo->prefix, 8);
f53adae4
DB		 2675
2676 if (!ipv6_addr_any(&in6_dev->token)) {
2677 read_lock_bh(&in6_dev->lock);
2678 memcpy(addr.s6_addr + 8,
2679 in6_dev->token.s6_addr + 8, 8);
2680 read_unlock_bh(&in6_dev->lock);
617fe29d 2681 tokenized = true;
cc9da6cc 2682 } else if (is_addr_mode_generate_stable(in6_dev) &&
622c81d5
HFS		 2683 !ipv6_generate_stable_address(&addr, 0,
2684 in6_dev)) {
64236f3f 2685 addr_flags |= IFA_F_STABLE_PRIVACY;
622c81d5 2686 goto ok;
f53adae4
DB		 2687 } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
2688 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
4f672235 2689 goto put;
f997c55c
AA		 2690 } else {
2691 dev_addr_generated = true;
1da177e4
LT		 2692 }
2693 goto ok;
2694 }
e87cc472
JP		 2695 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n",
2696 pinfo->prefix_len);
4f672235 2697 goto put;
1da177e4
LT		 2698
2699ok:
4f672235
AA		 2700 err = addrconf_prefix_rcv_add_addr(net, dev, pinfo, in6_dev,
2701 &addr, addr_type,
2702 addr_flags, sllao,
2703 tokenized, valid_lft,
2704 prefered_lft);
2705 if (err)
2706 goto put;
f997c55c
AA		 2707
2708 /* Ignore error case here because previous prefix add addr was
2709 * successful which will be notified.
2710 */
2711 ndisc_ops_prefix_rcv_add_addr(net, dev, pinfo, in6_dev, &addr,
2712 addr_type, addr_flags, sllao,
2713 tokenized, valid_lft,
2714 prefered_lft,
2715 dev_addr_generated);
1da177e4
LT		 2716 }
2717 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
4f672235 2718put:
1da177e4
LT		 2719 in6_dev_put(in6_dev);
2720}
2721
2722/*
2723 * Set destination address.
2724 * Special case for SIT interfaces where we create a new "virtual"
2725 * device.
2726 */
af284937 2727int addrconf_set_dstaddr(struct net *net, void __user *arg)
1da177e4
LT		 2728{
2729 struct in6_ifreq ireq;
2730 struct net_device *dev;
2731 int err = -EINVAL;
2732
2733 rtnl_lock();
2734
2735 err = -EFAULT;
2736 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2737 goto err_exit;
2738
af284937 2739 dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
1da177e4
LT		 2740
2741 err = -ENODEV;
63159f29 2742 if (!dev)
1da177e4
LT		 2743 goto err_exit;
2744
07a93626 2745#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4 2746 if (dev->type == ARPHRD_SIT) {
5bc3eb7e 2747 const struct net_device_ops *ops = dev->netdev_ops;
1da177e4 2748 struct ifreq ifr;
1da177e4
LT		 2749 struct ip_tunnel_parm p;
2750
2751 err = -EADDRNOTAVAIL;
2752 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2753 goto err_exit;
2754
2755 memset(&p, 0, sizeof(p));
2756 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2757 p.iph.saddr = 0;
2758 p.iph.version = 4;
2759 p.iph.ihl = 5;
2760 p.iph.protocol = IPPROTO_IPV6;
2761 p.iph.ttl = 64;
d20b3109 2762 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
1da177e4 2763
5bc3eb7e
SH		 2764 if (ops->ndo_do_ioctl) {
2765 mm_segment_t oldfs = get_fs();
2766
2767 set_fs(KERNEL_DS);
2768 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2769 set_fs(oldfs);
2770 } else
2771 err = -EOPNOTSUPP;
1da177e4
LT		 2772
2773 if (err == 0) {
2774 err = -ENOBUFS;
af284937
DL		 2775 dev = __dev_get_by_name(net, p.name);
2776 if (!dev)
1da177e4
LT		 2777 goto err_exit;
2778 err = dev_open(dev);
2779 }
2780 }
0be669bb 2781#endif
1da177e4
LT		 2782
2783err_exit:
2784 rtnl_unlock();
2785 return err;
2786}
2787
93a714d6
MC		 2788static int ipv6_mc_config(struct sock *sk, bool join,
2789 const struct in6_addr *addr, int ifindex)
2790{
2791 int ret;
2792
2793 ASSERT_RTNL();
2794
2795 lock_sock(sk);
2796 if (join)
54ff9ef3 2797 ret = ipv6_sock_mc_join(sk, ifindex, addr);
93a714d6 2798 else
54ff9ef3 2799 ret = ipv6_sock_mc_drop(sk, ifindex, addr);
93a714d6
MC		 2800 release_sock(sk);
2801
2802 return ret;
2803}
2804
1da177e4
LT		 2805/*
2806 * Manual configuration of address on an interface
2807 */
479840ff
JP		 2808static int inet6_addr_add(struct net *net, int ifindex,
2809 const struct in6_addr *pfx,
caeaba79 2810 const struct in6_addr *peer_pfx,
479840ff 2811 unsigned int plen, __u32 ifa_flags,
de95e047
DA		 2812 __u32 prefered_lft, __u32 valid_lft,
2813 struct netlink_ext_ack *extack)
1da177e4
LT		 2814{
2815 struct inet6_ifaddr *ifp;
2816 struct inet6_dev *idev;
2817 struct net_device *dev;
93a714d6
MC		 2818 unsigned long timeout;
2819 clock_t expires;
1da177e4 2820 int scope;
6f704992 2821 u32 flags;
1da177e4
LT		 2822
2823 ASSERT_RTNL();
1ab1457c 2824
24ef0da7
TG		 2825 if (plen > 128)
2826 return -EINVAL;
2827
0778769d
NT		 2828 /* check the lifetime */
2829 if (!valid_lft || prefered_lft > valid_lft)
2830 return -EINVAL;
2831
53bd6749
JP		 2832 if (ifa_flags & IFA_F_MANAGETEMPADDR && plen != 64)
2833 return -EINVAL;
2834
af284937
DL		 2835 dev = __dev_get_by_index(net, ifindex);
2836 if (!dev)
1da177e4 2837 return -ENODEV;
1ab1457c 2838
64e724f6
BH		 2839 idev = addrconf_add_dev(dev);
2840 if (IS_ERR(idev))
2841 return PTR_ERR(idev);
1da177e4 2842
93a714d6
MC		 2843 if (ifa_flags & IFA_F_MCAUTOJOIN) {
2844 int ret = ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2845 true, pfx, ifindex);
2846
2847 if (ret < 0)
2848 return ret;
2849 }
2850
1da177e4
LT		 2851 scope = ipv6_addr_scope(pfx);
2852
4bed72e4
YH		 2853 timeout = addrconf_timeout_fixup(valid_lft, HZ);
2854 if (addrconf_finite_timeout(timeout)) {
2855 expires = jiffies_to_clock_t(timeout * HZ);
2856 valid_lft = timeout;
6f704992 2857 flags = RTF_EXPIRES;
4bed72e4
YH		 2858 } else {
2859 expires = 0;
2860 flags = 0;
2861 ifa_flags |= IFA_F_PERMANENT;
6f704992 2862 }
0778769d 2863
4bed72e4
YH		 2864 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
2865 if (addrconf_finite_timeout(timeout)) {
2866 if (timeout == 0)
2867 ifa_flags |= IFA_F_DEPRECATED;
2868 prefered_lft = timeout;
2869 }
0778769d 2870
8a226b2c 2871 ifp = ipv6_add_addr(idev, pfx, peer_pfx, plen, scope, ifa_flags,
de95e047 2872 valid_lft, prefered_lft, true, extack);
0778769d 2873
1da177e4 2874 if (!IS_ERR(ifp)) {
761aac73
TH		 2875 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) {
2876 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
2877 expires, flags);
2878 }
2879
95c385b4
NH		 2880 /*
2881 * Note that section 3.1 of RFC 4429 indicates
2882 * that the Optimistic flag should not be set for
2883 * manually configured addresses
2884 */
cf22f9a2 2885 addrconf_dad_start(ifp);
53bd6749
JP		 2886 if (ifa_flags & IFA_F_MANAGETEMPADDR)
2887 manage_tempaddrs(idev, ifp, valid_lft, prefered_lft,
2888 true, jiffies);
1da177e4 2889 in6_ifa_put(ifp);
c15b1cca 2890 addrconf_verify_rtnl();
1da177e4 2891 return 0;
93a714d6
MC		 2892 } else if (ifa_flags & IFA_F_MCAUTOJOIN) {
2893 ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2894 false, pfx, ifindex);
1da177e4
LT		 2895 }
2896
2897 return PTR_ERR(ifp);
2898}
2899
6046d5b4
HK		 2900static int inet6_addr_del(struct net *net, int ifindex, u32 ifa_flags,
2901 const struct in6_addr *pfx, unsigned int plen)
1da177e4
LT		 2902{
2903 struct inet6_ifaddr *ifp;
2904 struct inet6_dev *idev;
2905 struct net_device *dev;
1ab1457c 2906
24ef0da7
TG		 2907 if (plen > 128)
2908 return -EINVAL;
2909
af284937
DL		 2910 dev = __dev_get_by_index(net, ifindex);
2911 if (!dev)
1da177e4
LT		 2912 return -ENODEV;
2913
e5d08d71 2914 idev = __in6_dev_get(dev);
63159f29 2915 if (!idev)
1da177e4
LT		 2916 return -ENXIO;
2917
2918 read_lock_bh(&idev->lock);
502a2ffd 2919 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1da177e4
LT		 2920 if (ifp->prefix_len == plen &&
2921 ipv6_addr_equal(pfx, &ifp->addr)) {
2922 in6_ifa_hold(ifp);
2923 read_unlock_bh(&idev->lock);
1ab1457c 2924
6046d5b4
HK		 2925 if (!(ifp->flags & IFA_F_TEMPORARY) &&
2926 (ifa_flags & IFA_F_MANAGETEMPADDR))
2927 manage_tempaddrs(idev, ifp, 0, 0, false,
2928 jiffies);
1da177e4 2929 ipv6_del_addr(ifp);
6046d5b4 2930 addrconf_verify_rtnl();
93a714d6
MC		 2931 if (ipv6_addr_is_multicast(pfx)) {
2932 ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2933 false, pfx, dev->ifindex);
2934 }
1da177e4
LT		 2935 return 0;
2936 }
2937 }
2938 read_unlock_bh(&idev->lock);
2939 return -EADDRNOTAVAIL;
2940}
2941
2942
af284937 2943int addrconf_add_ifaddr(struct net *net, void __user *arg)
1da177e4
LT		 2944{
2945 struct in6_ifreq ireq;
2946 int err;
1ab1457c 2947
af31f412 2948 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1da177e4 2949 return -EPERM;
1ab1457c 2950
1da177e4
LT		 2951 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2952 return -EFAULT;
2953
2954 rtnl_lock();
caeaba79 2955 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, NULL,
af284937 2956 ireq.ifr6_prefixlen, IFA_F_PERMANENT,
de95e047 2957 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME, NULL);
1da177e4
LT		 2958 rtnl_unlock();
2959 return err;
2960}
2961
af284937 2962int addrconf_del_ifaddr(struct net *net, void __user *arg)
1da177e4
LT		 2963{
2964 struct in6_ifreq ireq;
2965 int err;
1ab1457c 2966
af31f412 2967 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1da177e4
LT		 2968 return -EPERM;
2969
2970 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2971 return -EFAULT;
2972
2973 rtnl_lock();
6046d5b4 2974 err = inet6_addr_del(net, ireq.ifr6_ifindex, 0, &ireq.ifr6_addr,
af284937 2975 ireq.ifr6_prefixlen);
1da177e4
LT		 2976 rtnl_unlock();
2977 return err;
2978}
2979
b5f348e5
IJ		 2980static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
2981 int plen, int scope)
2982{
2983 struct inet6_ifaddr *ifp;
2984
8a226b2c 2985 ifp = ipv6_add_addr(idev, addr, NULL, plen,
07edd741 2986 scope, IFA_F_PERMANENT,
f3d9832e 2987 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME,
de95e047 2988 true, NULL);
b5f348e5
IJ		 2989 if (!IS_ERR(ifp)) {
2990 spin_lock_bh(&ifp->lock);
2991 ifp->flags &= ~IFA_F_TENTATIVE;
2992 spin_unlock_bh(&ifp->lock);
764d3be6 2993 rt_genid_bump_ipv6(dev_net(idev->dev));
b5f348e5
IJ		 2994 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2995 in6_ifa_put(ifp);
2996 }
2997}
2998
07a93626 2999#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4
LT		 3000static void sit_add_v4_addrs(struct inet6_dev *idev)
3001{
1da177e4
LT		 3002 struct in6_addr addr;
3003 struct net_device *dev;
c346dca1 3004 struct net *net = dev_net(idev->dev);
929c9cf3 3005 int scope, plen;
f0e2acfa 3006 u32 pflags = 0;
1da177e4
LT		 3007
3008 ASSERT_RTNL();
3009
3010 memset(&addr, 0, sizeof(struct in6_addr));
3011 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
3012
3013 if (idev->dev->flags&IFF_POINTOPOINT) {
3014 addr.s6_addr32[0] = htonl(0xfe800000);
3015 scope = IFA_LINK;
929c9cf3 3016 plen = 64;
1da177e4
LT		 3017 } else {
3018 scope = IPV6_ADDR_COMPATv4;
929c9cf3 3019 plen = 96;
f0e2acfa 3020 pflags |= RTF_NONEXTHOP;
1da177e4
LT		 3021 }
3022
3023 if (addr.s6_addr32[3]) {
929c9cf3 3024 add_addr(idev, &addr, plen, scope);
f0e2acfa 3025 addrconf_prefix_route(&addr, plen, idev->dev, 0, pflags);
1da177e4
LT		 3026 return;
3027 }
3028
6fda7350 3029 for_each_netdev(net, dev) {
8e5e8f30 3030 struct in_device *in_dev = __in_dev_get_rtnl(dev);
1da177e4 3031 if (in_dev && (dev->flags & IFF_UP)) {
8e5e8f30 3032 struct in_ifaddr *ifa;
1da177e4
LT		 3033
3034 int flag = scope;
3035
3036 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
1da177e4
LT		 3037
3038 addr.s6_addr32[3] = ifa->ifa_local;
3039
3040 if (ifa->ifa_scope == RT_SCOPE_LINK)
3041 continue;
3042 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
3043 if (idev->dev->flags&IFF_POINTOPOINT)
3044 continue;
3045 flag |= IFA_HOST;
3046 }
1da177e4 3047
b5f348e5 3048 add_addr(idev, &addr, plen, flag);
f0e2acfa
ND		 3049 addrconf_prefix_route(&addr, plen, idev->dev, 0,
3050 pflags);
1da177e4
LT		 3051 }
3052 }
1ab1457c 3053 }
1da177e4 3054}
0be669bb 3055#endif
1da177e4
LT		 3056
3057static void init_loopback(struct net_device *dev)
3058{
3059 struct inet6_dev *idev;
1da177e4
LT		 3060
3061 /* ::1 */
3062
3063 ASSERT_RTNL();
3064
e5d08d71 3065 idev = ipv6_find_idev(dev);
63159f29 3066 if (!idev) {
91df42be 3067 pr_debug("%s: add_dev failed\n", __func__);
1da177e4
LT		 3068 return;
3069 }
3070
b5f348e5 3071 add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
1da177e4
LT		 3072}
3073
2ad3ed59
AA		 3074void addrconf_add_linklocal(struct inet6_dev *idev,
3075 const struct in6_addr *addr, u32 flags)
1da177e4 3076{
8e5e8f30 3077 struct inet6_ifaddr *ifp;
64236f3f 3078 u32 addr_flags = flags | IFA_F_PERMANENT;
95c385b4
NH		 3079
3080#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
35e015e1
MC		 3081 if ((dev_net(idev->dev)->ipv6.devconf_all->optimistic_dad ||
3082 idev->cnf.optimistic_dad) &&
702beb87 3083 !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
95c385b4
NH		 3084 addr_flags |= IFA_F_OPTIMISTIC;
3085#endif
1da177e4 3086
07edd741 3087 ifp = ipv6_add_addr(idev, addr, NULL, 64, IFA_LINK, addr_flags,
de95e047 3088 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME, true, NULL);
1da177e4 3089 if (!IS_ERR(ifp)) {
46d48046 3090 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
cf22f9a2 3091 addrconf_dad_start(ifp);
1da177e4
LT		 3092 in6_ifa_put(ifp);
3093 }
3094}
2ad3ed59 3095EXPORT_SYMBOL_GPL(addrconf_add_linklocal);
1da177e4 3096
622c81d5
HFS		 3097static bool ipv6_reserved_interfaceid(struct in6_addr address)
3098{
3099 if ((address.s6_addr32[2] | address.s6_addr32[3]) == 0)
3100 return true;
3101
3102 if (address.s6_addr32[2] == htonl(0x02005eff) &&
3103 ((address.s6_addr32[3] & htonl(0xfe000000)) == htonl(0xfe000000)))
3104 return true;
3105
3106 if (address.s6_addr32[2] == htonl(0xfdffffff) &&
3107 ((address.s6_addr32[3] & htonl(0xffffff80)) == htonl(0xffffff80)))
3108 return true;
3109
3110 return false;
3111}
3112
3113static int ipv6_generate_stable_address(struct in6_addr *address,
3114 u8 dad_count,
3115 const struct inet6_dev *idev)
3116{
622c81d5
HFS		 3117 static DEFINE_SPINLOCK(lock);
3118 static __u32 digest[SHA_DIGEST_WORDS];
3119 static __u32 workspace[SHA_WORKSPACE_WORDS];
3120
3121 static union {
3122 char __data[SHA_MESSAGE_BYTES];
3123 struct {
3124 struct in6_addr secret;
ff40217e 3125 __be32 prefix[2];
622c81d5
HFS		 3126 unsigned char hwaddr[MAX_ADDR_LEN];
3127 u8 dad_count;
3128 } __packed;
3129 } data;
3130
3131 struct in6_addr secret;
3132 struct in6_addr temp;
3133 struct net *net = dev_net(idev->dev);
3134
3135 BUILD_BUG_ON(sizeof(data.__data) != sizeof(data));
3136
3137 if (idev->cnf.stable_secret.initialized)
3138 secret = idev->cnf.stable_secret.secret;
3139 else if (net->ipv6.devconf_dflt->stable_secret.initialized)
3140 secret = net->ipv6.devconf_dflt->stable_secret.secret;
3141 else
3142 return -1;
3143
3144retry:
3145 spin_lock_bh(&lock);
3146
3147 sha_init(digest);
3148 memset(&data, 0, sizeof(data));
3149 memset(workspace, 0, sizeof(workspace));
3150 memcpy(data.hwaddr, idev->dev->perm_addr, idev->dev->addr_len);
ff40217e
HFS		 3151 data.prefix[0] = address->s6_addr32[0];
3152 data.prefix[1] = address->s6_addr32[1];
622c81d5
HFS		 3153 data.secret = secret;
3154 data.dad_count = dad_count;
3155
3156 sha_transform(digest, data.__data, workspace);
3157
3158 temp = *address;
ff40217e
HFS		 3159 temp.s6_addr32[2] = (__force __be32)digest[0];
3160 temp.s6_addr32[3] = (__force __be32)digest[1];
622c81d5
HFS		 3161
3162 spin_unlock_bh(&lock);
3163
3164 if (ipv6_reserved_interfaceid(temp)) {
3165 dad_count++;
1855b7c3 3166 if (dad_count > dev_net(idev->dev)->ipv6.sysctl.idgen_retries)
622c81d5
HFS		 3167 return -1;
3168 goto retry;
3169 }
3170
3171 *address = temp;
3172 return 0;
3173}
3174
cc9da6cc
BM		 3175static void ipv6_gen_mode_random_init(struct inet6_dev *idev)
3176{
3177 struct ipv6_stable_secret *s = &idev->cnf.stable_secret;
3178
3179 if (s->initialized)
3180 return;
3181 s = &idev->cnf.stable_secret;
3182 get_random_bytes(&s->secret, sizeof(s->secret));
3183 s->initialized = true;
3184}
3185
bc91b0f0
JP		 3186static void addrconf_addr_gen(struct inet6_dev *idev, bool prefix_route)
3187{
622c81d5
HFS		 3188 struct in6_addr addr;
3189
ca254490
DA		 3190 /* no link local addresses on L3 master devices */
3191 if (netif_is_l3_master(idev->dev))
3192 return;
3193
622c81d5 3194 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
bc91b0f0 3195
d35a00b8 3196 switch (idev->cnf.addr_gen_mode) {
cc9da6cc
BM		 3197 case IN6_ADDR_GEN_MODE_RANDOM:
3198 ipv6_gen_mode_random_init(idev);
3199 /* fallthrough */
3200 case IN6_ADDR_GEN_MODE_STABLE_PRIVACY:
622c81d5 3201 if (!ipv6_generate_stable_address(&addr, 0, idev))
64236f3f
HFS		 3202 addrconf_add_linklocal(idev, &addr,
3203 IFA_F_STABLE_PRIVACY);
622c81d5
HFS		 3204 else if (prefix_route)
3205 addrconf_prefix_route(&addr, 64, idev->dev, 0, 0);
cc9da6cc
BM		 3206 break;
3207 case IN6_ADDR_GEN_MODE_EUI64:
bc91b0f0
JP		 3208 /* addrconf_add_linklocal also adds a prefix_route and we
3209 * only need to care about prefix routes if ipv6_generate_eui64
3210 * couldn't generate one.
3211 */
3212 if (ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) == 0)
64236f3f 3213 addrconf_add_linklocal(idev, &addr, 0);
bc91b0f0
JP		 3214 else if (prefix_route)
3215 addrconf_prefix_route(&addr, 64, idev->dev, 0, 0);
cc9da6cc
BM		 3216 break;
3217 case IN6_ADDR_GEN_MODE_NONE:
3218 default:
3219 /* will not add any link local address */
3220 break;
bc91b0f0
JP		 3221 }
3222}
3223
1da177e4
LT		 3224static void addrconf_dev_config(struct net_device *dev)
3225{
8e5e8f30 3226 struct inet6_dev *idev;
1da177e4
LT		 3227
3228 ASSERT_RTNL();
3229
74235a25
HX		 3230 if ((dev->type != ARPHRD_ETHER) &&
3231 (dev->type != ARPHRD_FDDI) &&
74235a25 3232 (dev->type != ARPHRD_ARCNET) &&
06a4c1c5 3233 (dev->type != ARPHRD_INFINIBAND) &&
e837735e 3234 (dev->type != ARPHRD_IEEE1394) &&
e74bccb8 3235 (dev->type != ARPHRD_TUNNEL6) &&
cc9da6cc 3236 (dev->type != ARPHRD_6LOWPAN) &&
45ce0fd1
FJ		 3237 (dev->type != ARPHRD_IP6GRE) &&
3238 (dev->type != ARPHRD_IPGRE) &&
3239 (dev->type != ARPHRD_TUNNEL) &&
cc9da6cc 3240 (dev->type != ARPHRD_NONE)) {
74235a25
HX		 3241 /* Alas, we support only Ethernet autoconfiguration. */
3242 return;
3243 }
3244
1da177e4 3245 idev = addrconf_add_dev(dev);
64e724f6 3246 if (IS_ERR(idev))
1da177e4
LT		 3247 return;
3248
cc9da6cc
BM		 3249 /* this device type has no EUI support */
3250 if (dev->type == ARPHRD_NONE &&
d35a00b8
FJ		 3251 idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_EUI64)
3252 idev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_RANDOM;
cc9da6cc 3253
bc91b0f0 3254 addrconf_addr_gen(idev, false);
1da177e4
LT		 3255}
3256
07a93626 3257#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4
LT		 3258static void addrconf_sit_config(struct net_device *dev)
3259{
3260 struct inet6_dev *idev;
3261
3262 ASSERT_RTNL();
3263
1ab1457c
YH		 3264 /*
3265 * Configure the tunnel with one of our IPv4
3266 * addresses... we should configure all of
1da177e4
LT		 3267 * our v4 addrs in the tunnel
3268 */
3269
e5d08d71 3270 idev = ipv6_find_idev(dev);
63159f29 3271 if (!idev) {
91df42be 3272 pr_debug("%s: add_dev failed\n", __func__);
1da177e4
LT		 3273 return;
3274 }
3275
c7dc89c0 3276 if (dev->priv_flags & IFF_ISATAP) {
bc91b0f0 3277 addrconf_addr_gen(idev, false);
c7dc89c0
FT		 3278 return;
3279 }
3280
1da177e4
LT		 3281 sit_add_v4_addrs(idev);
3282
62b54dd9 3283 if (dev->flags&IFF_POINTOPOINT)
1da177e4 3284 addrconf_add_mroute(dev);
1da177e4 3285}
0be669bb 3286#endif
1da177e4 3287
07a93626 3288#if IS_ENABLED(CONFIG_NET_IPGRE)
aee80b54 3289static void addrconf_gre_config(struct net_device *dev)
3290{
3291 struct inet6_dev *idev;
aee80b54 3292
aee80b54 3293 ASSERT_RTNL();
3294
e5d08d71 3295 idev = ipv6_find_idev(dev);
63159f29 3296 if (!idev) {
91df42be 3297 pr_debug("%s: add_dev failed\n", __func__);
aee80b54 3298 return;
3299 }
3300
bc91b0f0 3301 addrconf_addr_gen(idev, true);
d9e4ce65
HFS		 3302 if (dev->flags & IFF_POINTOPOINT)
3303 addrconf_add_mroute(dev);
aee80b54 3304}
3305#endif
3306
f1705ec1
DA		 3307static int fixup_permanent_addr(struct inet6_dev *idev,
3308 struct inet6_ifaddr *ifp)
3309{
fc882fcf 3310 /* !rt6i_node means the host route was removed from the
8048ced9
DA		 3311 * FIB, for example, if 'lo' device is taken down. In that
3312 * case regenerate the host route.
3313 */
fc882fcf 3314 if (!ifp->rt || !ifp->rt->rt6i_node) {
8048ced9 3315 struct rt6_info *rt, *prev;
f1705ec1
DA		 3316
3317 rt = addrconf_dst_alloc(idev, &ifp->addr, false);
63a4e80b 3318 if (IS_ERR(rt))
f1705ec1
DA		 3319 return PTR_ERR(rt);
3320
8048ced9
DA		 3321 /* ifp->rt can be accessed outside of rtnl */
3322 spin_lock(&ifp->lock);
3323 prev = ifp->rt;
f1705ec1 3324 ifp->rt = rt;
8048ced9
DA		 3325 spin_unlock(&ifp->lock);
3326
3327 ip6_rt_put(prev);
f1705ec1
DA		 3328 }
3329
3330 if (!(ifp->flags & IFA_F_NOPREFIXROUTE)) {
3331 addrconf_prefix_route(&ifp->addr, ifp->prefix_len,
3332 idev->dev, 0, 0);
3333 }
3334
6d717134
DA		 3335 if (ifp->state == INET6_IFADDR_STATE_PREDAD)
3336 addrconf_dad_start(ifp);
f1705ec1
DA		 3337
3338 return 0;
3339}
3340
3341static void addrconf_permanent_addr(struct net_device *dev)
3342{
3343 struct inet6_ifaddr *ifp, *tmp;
3344 struct inet6_dev *idev;
3345
3346 idev = __in6_dev_get(dev);
3347 if (!idev)
3348 return;
3349
3350 write_lock_bh(&idev->lock);
3351
3352 list_for_each_entry_safe(ifp, tmp, &idev->addr_list, if_list) {
3353 if ((ifp->flags & IFA_F_PERMANENT) &&
3354 fixup_permanent_addr(idev, ifp) < 0) {
3355 write_unlock_bh(&idev->lock);
e669b869 3356 in6_ifa_hold(ifp);
f1705ec1
DA		 3357 ipv6_del_addr(ifp);
3358 write_lock_bh(&idev->lock);
3359
3360 net_info_ratelimited("%s: Failed to add prefix route for address %pI6c; dropping\n",
3361 idev->dev->name, &ifp->addr);
3362 }
3363 }
3364
3365 write_unlock_bh(&idev->lock);
3366}
3367
1ab1457c 3368static int addrconf_notify(struct notifier_block *this, unsigned long event,
351638e7 3369 void *ptr)
1da177e4 3370{
351638e7 3371 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
4f7f34ea 3372 struct netdev_notifier_changeupper_info *info;
748e2d93 3373 struct inet6_dev *idev = __in6_dev_get(dev);
60abc0be 3374 struct net *net = dev_net(dev);
c5e33bdd 3375 int run_pending = 0;
b217d616 3376 int err;
1da177e4 3377
e21e8467 3378 switch (event) {
45ba9dd2 3379 case NETDEV_REGISTER:
74235a25 3380 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
45ba9dd2 3381 idev = ipv6_add_dev(dev);
a317a2f1
WC		 3382 if (IS_ERR(idev))
3383 return notifier_from_errno(PTR_ERR(idev));
45ba9dd2
YH		 3384 }
3385 break;
bcdd553f 3386
b7b0b1d2
AD		 3387 case NETDEV_CHANGEMTU:
3388 /* if MTU under IPV6_MIN_MTU stop IPv6 on this interface. */
3389 if (dev->mtu < IPV6_MIN_MTU) {
60abc0be 3390 addrconf_ifdown(dev, dev != net->loopback_dev);
b7b0b1d2
AD		 3391 break;
3392 }
3393
3394 if (idev) {
3395 rt6_mtu_change(dev, dev->mtu);
3396 idev->cnf.mtu6 = dev->mtu;
3397 break;
3398 }
3399
3400 /* allocate new idev */
3401 idev = ipv6_add_dev(dev);
3402 if (IS_ERR(idev))
3403 break;
3404
3405 /* device is still not ready */
3406 if (!(idev->if_flags & IF_READY))
3407 break;
3408
3409 run_pending = 1;
3410
3411 /* fall through */
3412
1da177e4 3413 case NETDEV_UP:
3c21edbd 3414 case NETDEV_CHANGE:
c2edacf8
JV		 3415 if (dev->flags & IFF_SLAVE)
3416 break;
3417
3ce62a84
WC		 3418 if (idev && idev->cnf.disable_ipv6)
3419 break;
3420
3c21edbd 3421 if (event == NETDEV_UP) {
38bd10c4
DA		 3422 /* restore routes for permanent addresses */
3423 addrconf_permanent_addr(dev);
3424
1f372c7b 3425 if (!addrconf_link_ready(dev)) {
3c21edbd 3426 /* device is not ready yet. */
f3213831 3427 pr_info("ADDRCONF(NETDEV_UP): %s: link is not ready\n",
3c21edbd
YH		 3428 dev->name);
3429 break;
3430 }
99081049 3431
d31c7b8f
EP		 3432 if (!idev && dev->mtu >= IPV6_MIN_MTU)
3433 idev = ipv6_add_dev(dev);
3434
a317a2f1 3435 if (!IS_ERR_OR_NULL(idev)) {
99081049 3436 idev->if_flags |= IF_READY;
e3ec6cfc
BT		 3437 run_pending = 1;
3438 }
b7b0b1d2 3439 } else if (event == NETDEV_CHANGE) {
1f372c7b 3440 if (!addrconf_link_ready(dev)) {
3c21edbd
YH		 3441 /* device is still not ready. */
3442 break;
3443 }
3444
3445 if (idev) {
a088d1d7
LL		 3446 if (idev->if_flags & IF_READY) {
3447 /* device is already configured -
3448 * but resend MLD reports, we might
3449 * have roamed and need to update
3450 * multicast snooping switches
3451 */
3452 ipv6_mc_up(idev);
3c21edbd 3453 break;
a088d1d7 3454 }
3c21edbd
YH		 3455 idev->if_flags |= IF_READY;
3456 }
3457
f3213831
JP		 3458 pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n",
3459 dev->name);
3c21edbd 3460
c5e33bdd 3461 run_pending = 1;
3c21edbd
YH		 3462 }
3463
e21e8467 3464 switch (dev->type) {
07a93626 3465#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4
LT		 3466 case ARPHRD_SIT:
3467 addrconf_sit_config(dev);
3468 break;
aee80b54 3469#endif
07a93626 3470#if IS_ENABLED(CONFIG_NET_IPGRE)
aee80b54 3471 case ARPHRD_IPGRE:
3472 addrconf_gre_config(dev);
3473 break;
0be669bb 3474#endif
1da177e4
LT		 3475 case ARPHRD_LOOPBACK:
3476 init_loopback(dev);
3477 break;
3478
3479 default:
3480 addrconf_dev_config(dev);
3481 break;
3ff50b79 3482 }
bcdd553f 3483
a317a2f1 3484 if (!IS_ERR_OR_NULL(idev)) {
c5e33bdd
YH		 3485 if (run_pending)
3486 addrconf_dad_run(idev);
3487
bcdd553f
SH		 3488 /*
3489 * If the MTU changed during the interface down,
3490 * when the interface up, the changed MTU must be
3491 * reflected in the idev as well as routers.
1da177e4 3492 */
bcdd553f
SH		 3493 if (idev->cnf.mtu6 != dev->mtu &&
3494 dev->mtu >= IPV6_MIN_MTU) {
1da177e4
LT		 3495 rt6_mtu_change(dev, dev->mtu);
3496 idev->cnf.mtu6 = dev->mtu;
3497 }
3498 idev->tstamp = jiffies;
3499 inet6_ifinfo_notify(RTM_NEWLINK, idev);
bcdd553f
SH		 3500
3501 /*
3502 * If the changed mtu during down is lower than
3503 * IPV6_MIN_MTU stop IPv6 on this interface.
1da177e4
LT		 3504 */
3505 if (dev->mtu < IPV6_MIN_MTU)
60abc0be 3506 addrconf_ifdown(dev, dev != net->loopback_dev);
1da177e4
LT		 3507 }
3508 break;
3509
1da177e4
LT		 3510 case NETDEV_DOWN:
3511 case NETDEV_UNREGISTER:
3512 /*
3513 * Remove all addresses from this interface.
3514 */
3515 addrconf_ifdown(dev, event != NETDEV_DOWN);
3516 break;
3c21edbd 3517
1da177e4 3518 case NETDEV_CHANGENAME:
1da177e4 3519 if (idev) {
5632c515 3520 snmp6_unregister_dev(idev);
408c4768 3521 addrconf_sysctl_unregister(idev);
a317a2f1 3522 err = addrconf_sysctl_register(idev);
b217d616
HX		 3523 if (err)
3524 return notifier_from_errno(err);
a317a2f1
WC		 3525 err = snmp6_register_dev(idev);
3526 if (err) {
3527 addrconf_sysctl_unregister(idev);
3528 return notifier_from_errno(err);
3529 }
5632c515 3530 }
1da177e4 3531 break;
bcdd553f 3532
93d9b7d7
JP		 3533 case NETDEV_PRE_TYPE_CHANGE:
3534 case NETDEV_POST_TYPE_CHANGE:
3ef0952c
AL		 3535 if (idev)
3536 addrconf_type_change(dev, event);
75c78500 3537 break;
4f7f34ea
DA		 3538
3539 case NETDEV_CHANGEUPPER:
3540 info = ptr;
3541
3542 /* flush all routes if dev is linked to or unlinked from
3543 * an L3 master device (e.g., VRF)
3544 */
3545 if (info->upper_dev && netif_is_l3_master(info->upper_dev))
3546 addrconf_ifdown(dev, 0);
3ff50b79 3547 }
1da177e4
LT		 3548
3549 return NOTIFY_OK;
3550}
3551
3552/*
3553 * addrconf module should be notified of a device going up
3554 */
3555static struct notifier_block ipv6_dev_notf = {
3556 .notifier_call = addrconf_notify,
242d3a49 3557 .priority = ADDRCONF_NOTIFY_PRIORITY,
1da177e4
LT		 3558};
3559
93d9b7d7 3560static void addrconf_type_change(struct net_device *dev, unsigned long event)
75c78500
MS		 3561{
3562 struct inet6_dev *idev;
3563 ASSERT_RTNL();
3564
3565 idev = __in6_dev_get(dev);
3566
93d9b7d7 3567 if (event == NETDEV_POST_TYPE_CHANGE)
75c78500 3568 ipv6_mc_remap(idev);
93d9b7d7 3569 else if (event == NETDEV_PRE_TYPE_CHANGE)
75c78500
MS		 3570 ipv6_mc_unmap(idev);
3571}
3572
70af921d
DA		 3573static bool addr_is_local(const struct in6_addr *addr)
3574{
3575 return ipv6_addr_type(addr) &
3576 (IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK);
3577}
3578
1da177e4
LT		 3579static int addrconf_ifdown(struct net_device *dev, int how)
3580{
c346dca1 3581 struct net *net = dev_net(dev);
502a2ffd 3582 struct inet6_dev *idev;
f1705ec1 3583 struct inet6_ifaddr *ifa, *tmp;
f1705ec1
DA		 3584 int _keep_addr;
3585 bool keep_addr;
73a8bd74 3586 int state, i;
1da177e4
LT		 3587
3588 ASSERT_RTNL();
3589
73a8bd74
DM		 3590 rt6_ifdown(net, dev);
3591 neigh_ifdown(&nd_tbl, dev);
1da177e4
LT		 3592
3593 idev = __in6_dev_get(dev);
63159f29 3594 if (!idev)
1da177e4
LT		 3595 return -ENODEV;
3596
bcdd553f
SH		 3597 /*
3598 * Step 1: remove reference to ipv6 device from parent device.
3599 * Do not dev_put!
1da177e4 3600 */
439e2385 3601 if (how) {
1da177e4 3602 idev->dead = 1;
8814c4b5
YH		 3603
3604 /* protected by rtnl_lock */
a9b3cd7f 3605 RCU_INIT_POINTER(dev->ip6_ptr, NULL);
1da177e4
LT		 3606
3607 /* Step 1.5: remove snmp6 entry */
3608 snmp6_unregister_dev(idev);
3609
3610 }
3611
f1705ec1
DA		 3612 /* aggregate the system setting and interface setting */
3613 _keep_addr = net->ipv6.devconf_all->keep_addr_on_down;
3614 if (!_keep_addr)
3615 _keep_addr = idev->cnf.keep_addr_on_down;
3616
3617 /* combine the user config with event to determine if permanent
3618 * addresses are to be removed from address hash table
3619 */
bc561632 3620 keep_addr = !(how || _keep_addr <= 0 || idev->cnf.disable_ipv6);
f1705ec1 3621
73a8bd74
DM		 3622 /* Step 2: clear hash table */
3623 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3624 struct hlist_head *h = &inet6_addr_lst[i];
73a8bd74
DM		 3625
3626 spin_lock_bh(&addrconf_hash_lock);
67ba4152 3627restart:
b67bfe0d 3628 hlist_for_each_entry_rcu(ifa, h, addr_lst) {
73a8bd74 3629 if (ifa->idev == idev) {
c15b1cca 3630 addrconf_del_dad_work(ifa);
f1705ec1
DA		 3631 /* combined flag + permanent flag decide if
3632 * address is retained on a down event
3633 */
3634 if (!keep_addr ||
70af921d
DA		 3635 !(ifa->flags & IFA_F_PERMANENT) ||
3636 addr_is_local(&ifa->addr)) {
f1705ec1
DA		 3637 hlist_del_init_rcu(&ifa->addr_lst);
3638 goto restart;
3639 }
73a8bd74
DM		 3640 }
3641 }
3642 spin_unlock_bh(&addrconf_hash_lock);
3643 }
3644
1da177e4
LT		 3645 write_lock_bh(&idev->lock);
3646
b7b1bfce
HFS		 3647 addrconf_del_rs_timer(idev);
3648
bcdd553f 3649 /* Step 2: clear flags for stateless addrconf */
439e2385 3650 if (!how)
3c21edbd 3651 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
1da177e4 3652
bcdd553f 3653 /* Step 3: clear tempaddr list */
372e6c8f 3654 while (!list_empty(&idev->tempaddr_list)) {
3655 ifa = list_first_entry(&idev->tempaddr_list,
3656 struct inet6_ifaddr, tmp_list);
3657 list_del(&ifa->tmp_list);
1da177e4
LT		 3658 write_unlock_bh(&idev->lock);
3659 spin_lock_bh(&ifa->lock);
3660
3661 if (ifa->ifpub) {
3662 in6_ifa_put(ifa->ifpub);
3663 ifa->ifpub = NULL;
3664 }
3665 spin_unlock_bh(&ifa->lock);
3666 in6_ifa_put(ifa);
3667 write_lock_bh(&idev->lock);
3668 }
8f37ada5 3669
f1705ec1
DA		 3670 /* re-combine the user config with event to determine if permanent
3671 * addresses are to be removed from the interface list
3672 */
bc561632 3673 keep_addr = (!how && _keep_addr > 0 && !idev->cnf.disable_ipv6);
84e8b803 3674
f1705ec1 3675 list_for_each_entry_safe(ifa, tmp, &idev->addr_list, if_list) {
38bd10c4 3676 struct rt6_info *rt = NULL;
a2d6cbb0 3677 bool keep;
38bd10c4 3678
f1705ec1 3679 addrconf_del_dad_work(ifa);
84e8b803 3680
a2d6cbb0
RV		 3681 keep = keep_addr && (ifa->flags & IFA_F_PERMANENT) &&
3682 !addr_is_local(&ifa->addr);
a2d6cbb0 3683
73a8bd74 3684 write_unlock_bh(&idev->lock);
8e8e676d 3685 spin_lock_bh(&ifa->lock);
f1705ec1 3686
a2d6cbb0 3687 if (keep) {
f1705ec1
DA		 3688 /* set state to skip the notifier below */
3689 state = INET6_IFADDR_STATE_DEAD;
6d717134 3690 ifa->state = INET6_IFADDR_STATE_PREDAD;
f1705ec1
DA		 3691 if (!(ifa->flags & IFA_F_NODAD))
3692 ifa->flags |= IFA_F_TENTATIVE;
38bd10c4
DA		 3693
3694 rt = ifa->rt;
3695 ifa->rt = NULL;
f1705ec1
DA		 3696 } else {
3697 state = ifa->state;
3698 ifa->state = INET6_IFADDR_STATE_DEAD;
f1705ec1
DA		 3699 }
3700
8e8e676d 3701 spin_unlock_bh(&ifa->lock);
9d82ca98 3702
38bd10c4
DA		 3703 if (rt)
3704 ip6_del_rt(rt);
3705
73a8bd74
DM		 3706 if (state != INET6_IFADDR_STATE_DEAD) {
3707 __ipv6_ifa_notify(RTM_DELADDR, ifa);
f88c91dd 3708 inet6addr_notifier_call_chain(NETDEV_DOWN, ifa);
ea06f717
MM		 3709 } else {
3710 if (idev->cnf.forwarding)
3711 addrconf_leave_anycast(ifa);
3712 addrconf_leave_solict(ifa->idev, &ifa->addr);
27bdb2ab 3713 }
8f37ada5 3714
73a8bd74 3715 write_lock_bh(&idev->lock);
8ef802aa
ED		 3716 if (!keep) {
3717 list_del_rcu(&ifa->if_list);
3718 in6_ifa_put(ifa);
3719 }
73a8bd74 3720 }
8f37ada5 3721
1da177e4
LT		 3722 write_unlock_bh(&idev->lock);
3723
381f4dca
SD		 3724 /* Step 5: Discard anycast and multicast list */
3725 if (how) {
3726 ipv6_ac_destroy_dev(idev);
1da177e4 3727 ipv6_mc_destroy_dev(idev);
381f4dca 3728 } else {
1da177e4 3729 ipv6_mc_down(idev);
381f4dca 3730 }
1da177e4 3731
1da177e4 3732 idev->tstamp = jiffies;
1ab1457c 3733
bcdd553f 3734 /* Last: Shot the device (if unregistered) */
439e2385 3735 if (how) {
408c4768 3736 addrconf_sysctl_unregister(idev);
1da177e4
LT		 3737 neigh_parms_release(&nd_tbl, idev->nd_parms);
3738 neigh_ifdown(&nd_tbl, dev);
3739 in6_dev_put(idev);
3740 }
3741 return 0;
3742}
3743
e99e88a9 3744static void addrconf_rs_timer(struct timer_list *t)
1da177e4 3745{
e99e88a9 3746 struct inet6_dev *idev = from_timer(idev, t, rs_timer);
caf92bc4 3747 struct net_device *dev = idev->dev;
b7b1bfce 3748 struct in6_addr lladdr;
1da177e4 3749
b7b1bfce 3750 write_lock(&idev->lock);
5b2a1953 3751 if (idev->dead || !(idev->if_flags & IF_READY))
1da177e4
LT		 3752 goto out;
3753
9ba2add3 3754 if (!ipv6_accept_ra(idev))
5b2a1953 3755 goto out;
3756
3757 /* Announcement received after solicitation was sent */
3758 if (idev->if_flags & IF_RA_RCVD)
1da177e4 3759 goto out;
1da177e4 3760
bd11f074 3761 if (idev->rs_probes++ < idev->cnf.rtr_solicits || idev->cnf.rtr_solicits < 0) {
caf92bc4
CW		 3762 write_unlock(&idev->lock);
3763 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
3764 ndisc_send_rs(dev, &lladdr,
b7b1bfce
HFS		 3765 &in6addr_linklocal_allrouters);
3766 else
caf92bc4 3767 goto put;
1da177e4 3768
caf92bc4 3769 write_lock(&idev->lock);
bd11f074
MŻ		 3770 idev->rs_interval = rfc3315_s14_backoff_update(
3771 idev->rs_interval, idev->cnf.rtr_solicit_max_interval);
b7b1bfce
HFS		 3772 /* The wait after the last probe can be shorter */
3773 addrconf_mod_rs_timer(idev, (idev->rs_probes ==
3774 idev->cnf.rtr_solicits) ?
3775 idev->cnf.rtr_solicit_delay :
bd11f074 3776 idev->rs_interval);
1da177e4 3777 } else {
1da177e4
LT		 3778 /*
3779 * Note: we do not support deprecated "all on-link"
3780 * assumption any longer.
3781 */
91df42be 3782 pr_debug("%s: no IPv6 routers present\n", idev->dev->name);
1da177e4
LT		 3783 }
3784
3785out:
b7b1bfce 3786 write_unlock(&idev->lock);
caf92bc4 3787put:
b7b1bfce 3788 in6_dev_put(idev);
1da177e4
LT		 3789}
3790
3791/*
3792 * Duplicate Address Detection
3793 */
3c21edbd
YH		 3794static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
3795{
3796 unsigned long rand_num;
3797 struct inet6_dev *idev = ifp->idev;
adc176c5 3798 u64 nonce;
3c21edbd 3799
95c385b4
NH		 3800 if (ifp->flags & IFA_F_OPTIMISTIC)
3801 rand_num = 0;
3802 else
63862b5b 3803 rand_num = prandom_u32() % (idev->cnf.rtr_solicit_delay ? : 1);
95c385b4 3804
adc176c5
EN		 3805 nonce = 0;
3806 if (idev->cnf.enhanced_dad ||
3807 dev_net(idev->dev)->ipv6.devconf_all->enhanced_dad) {
3808 do
3809 get_random_bytes(&nonce, 6);
3810 while (nonce == 0);
3811 }
3812 ifp->dad_nonce = nonce;
b7b1bfce 3813 ifp->dad_probes = idev->cnf.dad_transmits;
c15b1cca 3814 addrconf_mod_dad_work(ifp, rand_num);
3c21edbd
YH		 3815}
3816
c15b1cca 3817static void addrconf_dad_begin(struct inet6_ifaddr *ifp)
1da177e4
LT		 3818{
3819 struct inet6_dev *idev = ifp->idev;
3820 struct net_device *dev = idev->dev;
764d3be6 3821 bool bump_id, notify = false;
1da177e4
LT		 3822
3823 addrconf_join_solict(dev, &ifp->addr);
3824
63862b5b 3825 prandom_seed((__force u32) ifp->addr.s6_addr32[3]);
1da177e4
LT		 3826
3827 read_lock_bh(&idev->lock);
622ccdf1 3828 spin_lock(&ifp->lock);
e9d3e084 3829 if (ifp->state == INET6_IFADDR_STATE_DEAD)
1da177e4 3830 goto out;
1da177e4
LT		 3831
3832 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
a2d3f3e3
MC		 3833 (dev_net(dev)->ipv6.devconf_all->accept_dad < 1 &&
3834 idev->cnf.accept_dad < 1) ||
55ebaef1
NT		 3835 !(ifp->flags&IFA_F_TENTATIVE) ||
3836 ifp->flags & IFA_F_NODAD) {
db98f2c9
DA		 3837 bool send_na = false;
3838
3839 if (ifp->flags & IFA_F_TENTATIVE &&
3840 !(ifp->flags & IFA_F_OPTIMISTIC))
3841 send_na = true;
764d3be6 3842 bump_id = ifp->flags & IFA_F_TENTATIVE;
cc411d0b 3843 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
21809faf 3844 spin_unlock(&ifp->lock);
1da177e4
LT		 3845 read_unlock_bh(&idev->lock);
3846
db98f2c9 3847 addrconf_dad_completed(ifp, bump_id, send_na);
1da177e4
LT		 3848 return;
3849 }
3850
6732bade 3851 if (!(idev->if_flags & IF_READY)) {
21809faf 3852 spin_unlock(&ifp->lock);
6732bade 3853 read_unlock_bh(&idev->lock);
3c21edbd 3854 /*
590a9887 3855 * If the device is not ready:
3c21edbd
YH		 3856 * - keep it tentative if it is a permanent address.
3857 * - otherwise, kill it.
3858 */
3859 in6_ifa_hold(ifp);
cc411d0b 3860 addrconf_dad_stop(ifp, 0);
6732bade 3861 return;
3c21edbd 3862 }
95c385b4
NH		 3863
3864 /*
3865 * Optimistic nodes can start receiving
3866 * Frames right away
3867 */
7fd2561e 3868 if (ifp->flags & IFA_F_OPTIMISTIC) {
95c385b4 3869 ip6_ins_rt(ifp->rt);
35e015e1 3870 if (ipv6_use_optimistic_addr(dev_net(dev), idev)) {
7fd2561e
EK		 3871 /* Because optimistic nodes can use this address,
3872 * notify listeners. If DAD fails, RTM_DELADDR is sent.
3873 */
16186a82 3874 notify = true;
7fd2561e
EK		 3875 }
3876 }
95c385b4 3877
6732bade 3878 addrconf_dad_kick(ifp);
1da177e4 3879out:
622ccdf1 3880 spin_unlock(&ifp->lock);
1da177e4 3881 read_unlock_bh(&idev->lock);
16186a82
SAK		 3882 if (notify)
3883 ipv6_ifa_notify(RTM_NEWADDR, ifp);
1da177e4
LT		 3884}
3885
c15b1cca 3886static void addrconf_dad_start(struct inet6_ifaddr *ifp)
1da177e4 3887{
c15b1cca
HFS		 3888 bool begin_dad = false;
3889
8e8e676d 3890 spin_lock_bh(&ifp->lock);
c15b1cca
HFS		 3891 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
3892 ifp->state = INET6_IFADDR_STATE_PREDAD;
3893 begin_dad = true;
3894 }
8e8e676d 3895 spin_unlock_bh(&ifp->lock);
c15b1cca
HFS		 3896
3897 if (begin_dad)
3898 addrconf_mod_dad_work(ifp, 0);
3899}
3900
3901static void addrconf_dad_work(struct work_struct *w)
3902{
3903 struct inet6_ifaddr *ifp = container_of(to_delayed_work(w),
3904 struct inet6_ifaddr,
3905 dad_work);
1da177e4 3906 struct inet6_dev *idev = ifp->idev;
764d3be6 3907 bool bump_id, disable_ipv6 = false;
1da177e4
LT		 3908 struct in6_addr mcaddr;
3909
c15b1cca
HFS		 3910 enum {
3911 DAD_PROCESS,
3912 DAD_BEGIN,
3913 DAD_ABORT,
3914 } action = DAD_PROCESS;
3915
3916 rtnl_lock();
3917
8e8e676d 3918 spin_lock_bh(&ifp->lock);
c15b1cca
HFS		 3919 if (ifp->state == INET6_IFADDR_STATE_PREDAD) {
3920 action = DAD_BEGIN;
3921 ifp->state = INET6_IFADDR_STATE_DAD;
3922 } else if (ifp->state == INET6_IFADDR_STATE_ERRDAD) {
3923 action = DAD_ABORT;
3924 ifp->state = INET6_IFADDR_STATE_POSTDAD;
85b51b12 3925
35e015e1
MC		 3926 if ((dev_net(idev->dev)->ipv6.devconf_all->accept_dad > 1 ||
3927 idev->cnf.accept_dad > 1) &&
3928 !idev->cnf.disable_ipv6 &&
85b51b12
MM		 3929 !(ifp->flags & IFA_F_STABLE_PRIVACY)) {
3930 struct in6_addr addr;
3931
3932 addr.s6_addr32[0] = htonl(0xfe800000);
3933 addr.s6_addr32[1] = 0;
3934
3935 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
3936 ipv6_addr_equal(&ifp->addr, &addr)) {
3937 /* DAD failed for link-local based on MAC */
3938 idev->cnf.disable_ipv6 = 1;
3939
3940 pr_info("%s: IPv6 being disabled!\n",
3941 ifp->idev->dev->name);
3942 disable_ipv6 = true;
3943 }
3944 }
c15b1cca 3945 }
8e8e676d 3946 spin_unlock_bh(&ifp->lock);
c15b1cca
HFS		 3947
3948 if (action == DAD_BEGIN) {
3949 addrconf_dad_begin(ifp);
3950 goto out;
3951 } else if (action == DAD_ABORT) {
751eb6b6 3952 in6_ifa_hold(ifp);
c15b1cca 3953 addrconf_dad_stop(ifp, 1);
85b51b12
MM		 3954 if (disable_ipv6)
3955 addrconf_ifdown(idev->dev, 0);
c15b1cca
HFS		 3956 goto out;
3957 }
3958
b7b1bfce 3959 if (!ifp->dad_probes && addrconf_dad_end(ifp))
f2344a13
HX		 3960 goto out;
3961
c15b1cca 3962 write_lock_bh(&idev->lock);
122e4519 3963 if (idev->dead || !(idev->if_flags & IF_READY)) {
c15b1cca 3964 write_unlock_bh(&idev->lock);
1da177e4
LT		 3965 goto out;
3966 }
21809faf 3967
3968 spin_lock(&ifp->lock);
622ccdf1
HX		 3969 if (ifp->state == INET6_IFADDR_STATE_DEAD) {
3970 spin_unlock(&ifp->lock);
c15b1cca 3971 write_unlock_bh(&idev->lock);
622ccdf1
HX		 3972 goto out;
3973 }
3974
b7b1bfce 3975 if (ifp->dad_probes == 0) {
db98f2c9
DA		 3976 bool send_na = false;
3977
1da177e4
LT		 3978 /*
3979 * DAD was successful
3980 */
3981
db98f2c9
DA		 3982 if (ifp->flags & IFA_F_TENTATIVE &&
3983 !(ifp->flags & IFA_F_OPTIMISTIC))
3984 send_na = true;
764d3be6 3985 bump_id = ifp->flags & IFA_F_TENTATIVE;
cc411d0b 3986 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
21809faf 3987 spin_unlock(&ifp->lock);
c15b1cca 3988 write_unlock_bh(&idev->lock);
1da177e4 3989
db98f2c9 3990 addrconf_dad_completed(ifp, bump_id, send_na);
1da177e4
LT		 3991
3992 goto out;
3993 }
3994
b7b1bfce 3995 ifp->dad_probes--;
c15b1cca
HFS		 3996 addrconf_mod_dad_work(ifp,
3997 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME));
21809faf 3998 spin_unlock(&ifp->lock);
c15b1cca 3999 write_unlock_bh(&idev->lock);
1da177e4
LT		 4000
4001 /* send a neighbour solicitation for our addr */
1da177e4 4002 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
adc176c5
EN		 4003 ndisc_send_ns(ifp->idev->dev, &ifp->addr, &mcaddr, &in6addr_any,
4004 ifp->dad_nonce);
1da177e4
LT		 4005out:
4006 in6_ifa_put(ifp);
c15b1cca 4007 rtnl_unlock();
1da177e4
LT		 4008}
4009
11ffff75
HFS		 4010/* ifp->idev must be at least read locked */
4011static bool ipv6_lonely_lladdr(struct inet6_ifaddr *ifp)
4012{
4013 struct inet6_ifaddr *ifpiter;
4014 struct inet6_dev *idev = ifp->idev;
4015
602582ca
HFS		 4016 list_for_each_entry_reverse(ifpiter, &idev->addr_list, if_list) {
4017 if (ifpiter->scope > IFA_LINK)
4018 break;
11ffff75
HFS		 4019 if (ifp != ifpiter && ifpiter->scope == IFA_LINK &&
4020 (ifpiter->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE|
4021 IFA_F_OPTIMISTIC|IFA_F_DADFAILED)) ==
4022 IFA_F_PERMANENT)
4023 return false;
4024 }
4025 return true;
4026}
4027
db98f2c9
DA		 4028static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id,
4029 bool send_na)
1da177e4 4030{
e21e8467 4031 struct net_device *dev = ifp->idev->dev;
b7b1bfce 4032 struct in6_addr lladdr;
b173ee48 4033 bool send_rs, send_mld;
b7b1bfce 4034
c15b1cca 4035 addrconf_del_dad_work(ifp);
1da177e4
LT		 4036
4037 /*
4038 * Configure the address for reception. Now it is valid.
4039 */
4040
4041 ipv6_ifa_notify(RTM_NEWADDR, ifp);
4042
026359bc
TA		 4043 /* If added prefix is link local and we are prepared to process
4044 router advertisements, start sending router solicitations.
1da177e4
LT		 4045 */
4046
1ec047eb 4047 read_lock_bh(&ifp->idev->lock);
11ffff75 4048 send_mld = ifp->scope == IFA_LINK && ipv6_lonely_lladdr(ifp);
b173ee48
HFS		 4049 send_rs = send_mld &&
4050 ipv6_accept_ra(ifp->idev) &&
bd11f074 4051 ifp->idev->cnf.rtr_solicits != 0 &&
b173ee48 4052 (dev->flags&IFF_LOOPBACK) == 0;
1ec047eb
HFS		 4053 read_unlock_bh(&ifp->idev->lock);
4054
b173ee48
HFS		 4055 /* While dad is in progress mld report's source address is in6_addrany.
4056 * Resend with proper ll now.
4057 */
4058 if (send_mld)
4059 ipv6_mc_dad_complete(ifp->idev);
4060
db98f2c9
DA		 4061 /* send unsolicited NA if enabled */
4062 if (send_na &&
4063 (ifp->idev->cnf.ndisc_notify ||
4064 dev_net(dev)->ipv6.devconf_all->ndisc_notify)) {
4065 ndisc_send_na(dev, &in6addr_linklocal_allnodes, &ifp->addr,
4066 /*router=*/ !!ifp->idev->cnf.forwarding,
4067 /*solicited=*/ false, /*override=*/ true,
4068 /*inc_opt=*/ true);
4069 }
4070
1ec047eb 4071 if (send_rs) {
1da177e4
LT		 4072 /*
4073 * If a host as already performed a random delay
4074 * [...] as part of DAD [...] there is no need
4075 * to delay again before sending the first RS
4076 */
1ec047eb 4077 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
b7b1bfce 4078 return;
1ec047eb 4079 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters);
1da177e4 4080
b7b1bfce
HFS		 4081 write_lock_bh(&ifp->idev->lock);
4082 spin_lock(&ifp->lock);
bd11f074
MŻ		 4083 ifp->idev->rs_interval = rfc3315_s14_backoff_init(
4084 ifp->idev->cnf.rtr_solicit_interval);
b7b1bfce 4085 ifp->idev->rs_probes = 1;
1da177e4 4086 ifp->idev->if_flags |= IF_RS_SENT;
bd11f074 4087 addrconf_mod_rs_timer(ifp->idev, ifp->idev->rs_interval);
b7b1bfce
HFS		 4088 spin_unlock(&ifp->lock);
4089 write_unlock_bh(&ifp->idev->lock);
1da177e4 4090 }
764d3be6
PA		 4091
4092 if (bump_id)
4093 rt_genid_bump_ipv6(dev_net(dev));
a11a7f71
MH		 4094
4095 /* Make sure that a new temporary address will be created
4096 * before this temporary address becomes deprecated.
4097 */
4098 if (ifp->flags & IFA_F_TEMPORARY)
4099 addrconf_verify_rtnl();
1da177e4
LT		 4100}
4101
e21e8467
SH		 4102static void addrconf_dad_run(struct inet6_dev *idev)
4103{
c5e33bdd
YH		 4104 struct inet6_ifaddr *ifp;
4105
4106 read_lock_bh(&idev->lock);
502a2ffd 4107 list_for_each_entry(ifp, &idev->addr_list, if_list) {
21809faf 4108 spin_lock(&ifp->lock);
f2344a13
HX		 4109 if (ifp->flags & IFA_F_TENTATIVE &&
4110 ifp->state == INET6_IFADDR_STATE_DAD)
4111 addrconf_dad_kick(ifp);
21809faf 4112 spin_unlock(&ifp->lock);
c5e33bdd
YH		 4113 }
4114 read_unlock_bh(&idev->lock);
4115}
4116
1da177e4
LT		 4117#ifdef CONFIG_PROC_FS
4118struct if6_iter_state {
3c40090a 4119 struct seq_net_private p;
1da177e4 4120 int bucket;
1d578303 4121 int offset;
1da177e4
LT		 4122};
4123
1d578303 4124static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos)
1da177e4 4125{
1da177e4 4126 struct if6_iter_state *state = seq->private;
1218854a 4127 struct net *net = seq_file_net(seq);
a5c1d98f 4128 struct inet6_ifaddr *ifa = NULL;
1d578303 4129 int p = 0;
1da177e4 4130
1d578303
MM		 4131 /* initial bucket if pos is 0 */
4132 if (pos == 0) {
4133 state->bucket = 0;
4134 state->offset = 0;
4135 }
4136
4137 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
a5c1d98f 4138 hlist_for_each_entry_rcu(ifa, &inet6_addr_lst[state->bucket],
1d578303 4139 addr_lst) {
9f0d3c27
ED		 4140 if (!net_eq(dev_net(ifa->idev->dev), net))
4141 continue;
1d578303
MM		 4142 /* sync with offset */
4143 if (p < state->offset) {
4144 p++;
4145 continue;
4146 }
4147 state->offset++;
9f0d3c27 4148 return ifa;
1d578303
MM		 4149 }
4150
4151 /* prepare for next bucket */
4152 state->offset = 0;
4153 p = 0;
1da177e4 4154 }
c2e21293 4155 return NULL;
1da177e4
LT		 4156}
4157
c2e21293 4158static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
4159 struct inet6_ifaddr *ifa)
1da177e4
LT		 4160{
4161 struct if6_iter_state *state = seq->private;
1218854a 4162 struct net *net = seq_file_net(seq);
1da177e4 4163
a5c1d98f 4164 hlist_for_each_entry_continue_rcu(ifa, addr_lst) {
9f0d3c27
ED		 4165 if (!net_eq(dev_net(ifa->idev->dev), net))
4166 continue;
1d578303 4167 state->offset++;
9f0d3c27 4168 return ifa;
1d578303 4169 }
3c40090a 4170
c2e21293 4171 while (++state->bucket < IN6_ADDR_HSIZE) {
1d578303 4172 state->offset = 0;
a5c1d98f 4173 hlist_for_each_entry_rcu(ifa,
c2e21293 4174 &inet6_addr_lst[state->bucket], addr_lst) {
9f0d3c27
ED		 4175 if (!net_eq(dev_net(ifa->idev->dev), net))
4176 continue;
1d578303 4177 state->offset++;
9f0d3c27 4178 return ifa;
c2e21293 4179 }
1da177e4 4180 }
3c40090a 4181
c2e21293 4182 return NULL;
1da177e4
LT		 4183}
4184
1da177e4 4185static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
a5c1d98f 4186 __acquires(rcu)
1da177e4 4187{
a5c1d98f 4188 rcu_read_lock();
1d578303 4189 return if6_get_first(seq, *pos);
1da177e4
LT		 4190}
4191
4192static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
4193{
4194 struct inet6_ifaddr *ifa;
4195
4196 ifa = if6_get_next(seq, v);
4197 ++*pos;
4198 return ifa;
4199}
4200
4201static void if6_seq_stop(struct seq_file *seq, void *v)
a5c1d98f 4202 __releases(rcu)
1da177e4 4203{
a5c1d98f 4204 rcu_read_unlock();
1da177e4
LT		 4205}
4206
4207static int if6_seq_show(struct seq_file *seq, void *v)
4208{
4209 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
971a351c 4210 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
b071195d 4211 &ifp->addr,
1da177e4
LT		 4212 ifp->idev->dev->ifindex,
4213 ifp->prefix_len,
4214 ifp->scope,
971a351c 4215 (u8) ifp->flags,
1da177e4
LT		 4216 ifp->idev->dev->name);
4217 return 0;
4218}
4219
56b3d975 4220static const struct seq_operations if6_seq_ops = {
1da177e4
LT		 4221 .start = if6_seq_start,
4222 .next = if6_seq_next,
4223 .show = if6_seq_show,
4224 .stop = if6_seq_stop,
4225};
4226
4227static int if6_seq_open(struct inode *inode, struct file *file)
4228{
3c40090a
DL		 4229 return seq_open_net(inode, file, &if6_seq_ops,
4230 sizeof(struct if6_iter_state));
1da177e4
LT		 4231}
4232
9a32144e 4233static const struct file_operations if6_fops = {
1da177e4
LT		 4234 .owner = THIS_MODULE,
4235 .open = if6_seq_open,
4236 .read = seq_read,
4237 .llseek = seq_lseek,
3c40090a 4238 .release = seq_release_net,
1da177e4
LT		 4239};
4240
2c8c1e72 4241static int __net_init if6_proc_net_init(struct net *net)
1da177e4 4242{
d4beaa66 4243 if (!proc_create("if_inet6", S_IRUGO, net->proc_net, &if6_fops))
1da177e4
LT		 4244 return -ENOMEM;
4245 return 0;
4246}
4247
2c8c1e72 4248static void __net_exit if6_proc_net_exit(struct net *net)
3c40090a 4249{
ece31ffd 4250 remove_proc_entry("if_inet6", net->proc_net);
3c40090a
DL		 4251}
4252
4253static struct pernet_operations if6_proc_net_ops = {
67ba4152
IM		 4254 .init = if6_proc_net_init,
4255 .exit = if6_proc_net_exit,
3c40090a
DL		 4256};
4257
4258int __init if6_proc_init(void)
4259{
4260 return register_pernet_subsys(&if6_proc_net_ops);
4261}
4262
1da177e4
LT		 4263void if6_proc_exit(void)
4264{
3c40090a 4265 unregister_pernet_subsys(&if6_proc_net_ops);
1da177e4
LT		 4266}
4267#endif /* CONFIG_PROC_FS */
4268
07a93626 4269#if IS_ENABLED(CONFIG_IPV6_MIP6)
3b9f9a1c 4270/* Check if address is a home address configured on any interface. */
b71d1d42 4271int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr)
3b9f9a1c 4272{
3f27fb23 4273 unsigned int hash = inet6_addr_hash(net, addr);
c2e21293 4274 struct inet6_ifaddr *ifp = NULL;
3f27fb23 4275 int ret = 0;
c2e21293 4276
4e5f47ab
ED		 4277 rcu_read_lock();
4278 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
878628fb 4279 if (!net_eq(dev_net(ifp->idev->dev), net))
389f6612 4280 continue;
caad295f 4281 if (ipv6_addr_equal(&ifp->addr, addr) &&
3b9f9a1c
NT		 4282 (ifp->flags & IFA_F_HOMEADDRESS)) {
4283 ret = 1;
4284 break;
4285 }
4286 }
4e5f47ab 4287 rcu_read_unlock();
3b9f9a1c
NT		 4288 return ret;
4289}
4290#endif
4291
1da177e4
LT		 4292/*
4293 * Periodic address status verification
4294 */
4295
c15b1cca 4296static void addrconf_verify_rtnl(void)
1da177e4 4297{
b2db7564 4298 unsigned long now, next, next_sec, next_sched;
1da177e4 4299 struct inet6_ifaddr *ifp;
1da177e4
LT		 4300 int i;
4301
c15b1cca
HFS		 4302 ASSERT_RTNL();
4303
5c578aed 4304 rcu_read_lock_bh();
1da177e4 4305 now = jiffies;
b2db7564 4306 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
1da177e4 4307
c15b1cca 4308 cancel_delayed_work(&addr_chk_work);
1da177e4 4309
bcdd553f 4310 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
1da177e4 4311restart:
c15b1cca 4312 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[i], addr_lst) {
1da177e4 4313 unsigned long age;
1da177e4 4314
fad8da3e
YA		 4315 /* When setting preferred_lft to a value not zero or
4316 * infinity, while valid_lft is infinity
4317 * IFA_F_PERMANENT has a non-infinity life time.
4318 */
4319 if ((ifp->flags & IFA_F_PERMANENT) &&
4320 (ifp->prefered_lft == INFINITY_LIFE_TIME))
1da177e4
LT		 4321 continue;
4322
4323 spin_lock(&ifp->lock);
b2db7564
YH		 4324 /* We try to batch several events at once. */
4325 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
1da177e4 4326
8f27ebb9
YH		 4327 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
4328 age >= ifp->valid_lft) {
1da177e4
LT		 4329 spin_unlock(&ifp->lock);
4330 in6_ifa_hold(ifp);
1da177e4
LT		 4331 ipv6_del_addr(ifp);
4332 goto restart;
8f27ebb9
YH		 4333 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
4334 spin_unlock(&ifp->lock);
4335 continue;
1da177e4 4336 } else if (age >= ifp->prefered_lft) {
a1ed0526 4337 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
1da177e4
LT		 4338 int deprecate = 0;
4339
4340 if (!(ifp->flags&IFA_F_DEPRECATED)) {
4341 deprecate = 1;
4342 ifp->flags |= IFA_F_DEPRECATED;
4343 }
4344
fad8da3e
YA		 4345 if ((ifp->valid_lft != INFINITY_LIFE_TIME) &&
4346 (time_before(ifp->tstamp + ifp->valid_lft * HZ, next)))
1da177e4
LT		 4347 next = ifp->tstamp + ifp->valid_lft * HZ;
4348
4349 spin_unlock(&ifp->lock);
4350
4351 if (deprecate) {
4352 in6_ifa_hold(ifp);
1da177e4
LT		 4353
4354 ipv6_ifa_notify(0, ifp);
4355 in6_ifa_put(ifp);
4356 goto restart;
4357 }
1da177e4
LT		 4358 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
4359 !(ifp->flags&IFA_F_TENTATIVE)) {
88949cf4 4360 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
4361 ifp->idev->cnf.dad_transmits *
1f9248e5 4362 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME) / HZ;
88949cf4 4363
1da177e4
LT		 4364 if (age >= ifp->prefered_lft - regen_advance) {
4365 struct inet6_ifaddr *ifpub = ifp->ifpub;
4366 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
4367 next = ifp->tstamp + ifp->prefered_lft * HZ;
4368 if (!ifp->regen_count && ifpub) {
4369 ifp->regen_count++;
4370 in6_ifa_hold(ifp);
4371 in6_ifa_hold(ifpub);
4372 spin_unlock(&ifp->lock);
5c578aed 4373
291d809b
HY		 4374 spin_lock(&ifpub->lock);
4375 ifpub->regen_count = 0;
4376 spin_unlock(&ifpub->lock);
2527a7e2 4377 rcu_read_unlock_bh();
fffcefe9 4378 ipv6_create_tempaddr(ifpub, ifp, true);
1da177e4
LT		 4379 in6_ifa_put(ifpub);
4380 in6_ifa_put(ifp);
2527a7e2 4381 rcu_read_lock_bh();
1da177e4
LT		 4382 goto restart;
4383 }
4384 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
4385 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
4386 spin_unlock(&ifp->lock);
1da177e4
LT		 4387 } else {
4388 /* ifp->prefered_lft <= ifp->valid_lft */
4389 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
4390 next = ifp->tstamp + ifp->prefered_lft * HZ;
4391 spin_unlock(&ifp->lock);
4392 }
4393 }
1da177e4
LT		 4394 }
4395
b2db7564
YH		 4396 next_sec = round_jiffies_up(next);
4397 next_sched = next;
4398
4399 /* If rounded timeout is accurate enough, accept it. */
4400 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
4401 next_sched = next_sec;
4402
4403 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
4404 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
4405 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
4406
ba3542e1 4407 ADBG(KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
4408 now, next, next_sec, next_sched);
c15b1cca 4409 mod_delayed_work(addrconf_wq, &addr_chk_work, next_sched - now);
5c578aed 4410 rcu_read_unlock_bh();
1da177e4
LT		 4411}
4412
c15b1cca
HFS		 4413static void addrconf_verify_work(struct work_struct *w)
4414{
4415 rtnl_lock();
4416 addrconf_verify_rtnl();
4417 rtnl_unlock();
4418}
4419
4420static void addrconf_verify(void)
4421{
4422 mod_delayed_work(addrconf_wq, &addr_chk_work, 0);
4423}
4424
caeaba79
ND		 4425static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local,
4426 struct in6_addr **peer_pfx)
461d8837
TG		 4427{
4428 struct in6_addr *pfx = NULL;
4429
caeaba79
ND		 4430 *peer_pfx = NULL;
4431
461d8837
TG		 4432 if (addr)
4433 pfx = nla_data(addr);
4434
4435 if (local) {
4436 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
caeaba79
ND		 4437 *peer_pfx = pfx;
4438 pfx = nla_data(local);
461d8837
TG		 4439 }
4440
4441 return pfx;
4442}
4443
ef7c79ed 4444static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
461d8837
TG		 4445 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
4446 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
4447 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
479840ff 4448 [IFA_FLAGS] = { .len = sizeof(u32) },
461d8837
TG		 4449};
4450
1da177e4 4451static int
c21ef3e3
DA		 4452inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh,
4453 struct netlink_ext_ack *extack)
1da177e4 4454{
3b1e0a65 4455 struct net *net = sock_net(skb->sk);
b933f716
TG		 4456 struct ifaddrmsg *ifm;
4457 struct nlattr *tb[IFA_MAX+1];
caeaba79 4458 struct in6_addr *pfx, *peer_pfx;
6046d5b4 4459 u32 ifa_flags;
b933f716 4460 int err;
1da177e4 4461
fceb6435 4462 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy,
c21ef3e3 4463 extack);
b933f716
TG		 4464 if (err < 0)
4465 return err;
4466
4467 ifm = nlmsg_data(nlh);
caeaba79 4468 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
63159f29 4469 if (!pfx)
1da177e4
LT		 4470 return -EINVAL;
4471
6046d5b4
HK		 4472 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
4473
4474 /* We ignore other flags so far. */
4475 ifa_flags &= IFA_F_MANAGETEMPADDR;
4476
4477 return inet6_addr_del(net, ifm->ifa_index, ifa_flags, pfx,
4478 ifm->ifa_prefixlen);
1da177e4
LT		 4479}
4480
479840ff 4481static int inet6_addr_modify(struct inet6_ifaddr *ifp, u32 ifa_flags,
55ebaef1 4482 u32 prefered_lft, u32 valid_lft)
081bba5b 4483{
6f704992
YH		 4484 u32 flags;
4485 clock_t expires;
4bed72e4 4486 unsigned long timeout;
53bd6749 4487 bool was_managetempaddr;
5b84efec 4488 bool had_prefixroute;
46d48046 4489
c15b1cca
HFS		 4490 ASSERT_RTNL();
4491
081bba5b
NT		 4492 if (!valid_lft || (prefered_lft > valid_lft))
4493 return -EINVAL;
4494
53bd6749
JP		 4495 if (ifa_flags & IFA_F_MANAGETEMPADDR &&
4496 (ifp->flags & IFA_F_TEMPORARY || ifp->prefix_len != 64))
4497 return -EINVAL;
4498
4bed72e4
YH		 4499 timeout = addrconf_timeout_fixup(valid_lft, HZ);
4500 if (addrconf_finite_timeout(timeout)) {
4501 expires = jiffies_to_clock_t(timeout * HZ);
4502 valid_lft = timeout;
6f704992 4503 flags = RTF_EXPIRES;
4bed72e4
YH		 4504 } else {
4505 expires = 0;
4506 flags = 0;
4507 ifa_flags |= IFA_F_PERMANENT;
6f704992 4508 }
081bba5b 4509
4bed72e4
YH		 4510 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
4511 if (addrconf_finite_timeout(timeout)) {
4512 if (timeout == 0)
4513 ifa_flags |= IFA_F_DEPRECATED;
4514 prefered_lft = timeout;
4515 }
081bba5b
NT		 4516
4517 spin_lock_bh(&ifp->lock);
53bd6749 4518 was_managetempaddr = ifp->flags & IFA_F_MANAGETEMPADDR;
5b84efec
TH		 4519 had_prefixroute = ifp->flags & IFA_F_PERMANENT &&
4520 !(ifp->flags & IFA_F_NOPREFIXROUTE);
53bd6749 4521 ifp->flags &= ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD |
761aac73
TH		 4522 IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
4523 IFA_F_NOPREFIXROUTE);
53bd6749 4524 ifp->flags |= ifa_flags;
081bba5b
NT		 4525 ifp->tstamp = jiffies;
4526 ifp->valid_lft = valid_lft;
4527 ifp->prefered_lft = prefered_lft;
4528
4529 spin_unlock_bh(&ifp->lock);
4530 if (!(ifp->flags&IFA_F_TENTATIVE))
4531 ipv6_ifa_notify(0, ifp);
081bba5b 4532
761aac73
TH		 4533 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) {
4534 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
4535 expires, flags);
5b84efec
TH		 4536 } else if (had_prefixroute) {
4537 enum cleanup_prefix_rt_t action;
4538 unsigned long rt_expires;
4539
4540 write_lock_bh(&ifp->idev->lock);
4541 action = check_cleanup_prefix_route(ifp, &rt_expires);
4542 write_unlock_bh(&ifp->idev->lock);
4543
4544 if (action != CLEANUP_PREFIX_RT_NOP) {
4545 cleanup_prefix_route(ifp, rt_expires,
4546 action == CLEANUP_PREFIX_RT_DEL);
4547 }
761aac73 4548 }
53bd6749
JP		 4549
4550 if (was_managetempaddr || ifp->flags & IFA_F_MANAGETEMPADDR) {
4551 if (was_managetempaddr && !(ifp->flags & IFA_F_MANAGETEMPADDR))
4552 valid_lft = prefered_lft = 0;
4553 manage_tempaddrs(ifp->idev, ifp, valid_lft, prefered_lft,
4554 !was_managetempaddr, jiffies);
4555 }
4556
c15b1cca 4557 addrconf_verify_rtnl();
081bba5b
NT		 4558
4559 return 0;
4560}
4561
1da177e4 4562static int
c21ef3e3
DA		 4563inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh,
4564 struct netlink_ext_ack *extack)
1da177e4 4565{
3b1e0a65 4566 struct net *net = sock_net(skb->sk);
461d8837
TG		 4567 struct ifaddrmsg *ifm;
4568 struct nlattr *tb[IFA_MAX+1];
caeaba79 4569 struct in6_addr *pfx, *peer_pfx;
7198f8ce
TG		 4570 struct inet6_ifaddr *ifa;
4571 struct net_device *dev;
55ebaef1 4572 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
479840ff 4573 u32 ifa_flags;
461d8837 4574 int err;
1da177e4 4575
fceb6435 4576 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy,
c21ef3e3 4577 extack);
461d8837
TG		 4578 if (err < 0)
4579 return err;
4580
4581 ifm = nlmsg_data(nlh);
caeaba79 4582 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
63159f29 4583 if (!pfx)
1da177e4
LT		 4584 return -EINVAL;
4585
461d8837 4586 if (tb[IFA_CACHEINFO]) {
0778769d 4587 struct ifa_cacheinfo *ci;
461d8837
TG		 4588
4589 ci = nla_data(tb[IFA_CACHEINFO]);
0778769d 4590 valid_lft = ci->ifa_valid;
461d8837
TG		 4591 preferred_lft = ci->ifa_prefered;
4592 } else {
4593 preferred_lft = INFINITY_LIFE_TIME;
4594 valid_lft = INFINITY_LIFE_TIME;
0778769d
NT		 4595 }
4596
af284937 4597 dev = __dev_get_by_index(net, ifm->ifa_index);
63159f29 4598 if (!dev)
7198f8ce
TG		 4599 return -ENODEV;
4600
479840ff
JP		 4601 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
4602
55ebaef1 4603 /* We ignore other flags so far. */
761aac73 4604 ifa_flags &= IFA_F_NODAD | IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
93a714d6 4605 IFA_F_NOPREFIXROUTE | IFA_F_MCAUTOJOIN;
55ebaef1 4606
1cab3da6 4607 ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
63159f29 4608 if (!ifa) {
7198f8ce
TG		 4609 /*
4610 * It would be best to check for !NLM_F_CREATE here but
db9c7c39 4611 * userspace already relies on not having to provide this.
7198f8ce 4612 */
caeaba79 4613 return inet6_addr_add(net, ifm->ifa_index, pfx, peer_pfx,
af284937 4614 ifm->ifa_prefixlen, ifa_flags,
de95e047 4615 preferred_lft, valid_lft, extack);
081bba5b
NT		 4616 }
4617
7198f8ce
TG		 4618 if (nlh->nlmsg_flags & NLM_F_EXCL ||
4619 !(nlh->nlmsg_flags & NLM_F_REPLACE))
4620 err = -EEXIST;
4621 else
55ebaef1 4622 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
7198f8ce
TG		 4623
4624 in6_ifa_put(ifa);
4625
4626 return err;
1da177e4
LT		 4627}
4628
479840ff 4629static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u32 flags,
101bb229
TG		 4630 u8 scope, int ifindex)
4631{
4632 struct ifaddrmsg *ifm;
4633
4634 ifm = nlmsg_data(nlh);
4635 ifm->ifa_family = AF_INET6;
4636 ifm->ifa_prefixlen = prefixlen;
4637 ifm->ifa_flags = flags;
4638 ifm->ifa_scope = scope;
4639 ifm->ifa_index = ifindex;
4640}
4641
85486af0
TG		 4642static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
4643 unsigned long tstamp, u32 preferred, u32 valid)
4644{
4645 struct ifa_cacheinfo ci;
4646
18a31e1e
TG		 4647 ci.cstamp = cstamp_delta(cstamp);
4648 ci.tstamp = cstamp_delta(tstamp);
85486af0
TG		 4649 ci.ifa_prefered = preferred;
4650 ci.ifa_valid = valid;
4651
4652 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
4653}
4654
101bb229
TG		 4655static inline int rt_scope(int ifa_scope)
4656{
4657 if (ifa_scope & IFA_HOST)
4658 return RT_SCOPE_HOST;
4659 else if (ifa_scope & IFA_LINK)
4660 return RT_SCOPE_LINK;
4661 else if (ifa_scope & IFA_SITE)
4662 return RT_SCOPE_SITE;
4663 else
4664 return RT_SCOPE_UNIVERSE;
4665}
4666
0ab6803b
TG		 4667static inline int inet6_ifaddr_msgsize(void)
4668{
339bf98f 4669 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
caeaba79 4670 + nla_total_size(16) /* IFA_LOCAL */
339bf98f 4671 + nla_total_size(16) /* IFA_ADDRESS */
479840ff
JP		 4672 + nla_total_size(sizeof(struct ifa_cacheinfo))
4673 + nla_total_size(4) /* IFA_FLAGS */;
0ab6803b 4674}
c5396a31 4675
1da177e4 4676static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
15e47304 4677 u32 portid, u32 seq, int event, unsigned int flags)
1da177e4 4678{
1da177e4 4679 struct nlmsghdr *nlh;
85486af0 4680 u32 preferred, valid;
1da177e4 4681
15e47304 4682 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
63159f29 4683 if (!nlh)
26932566 4684 return -EMSGSIZE;
0ab6803b 4685
101bb229
TG		 4686 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
4687 ifa->idev->dev->ifindex);
4688
fad8da3e
YA		 4689 if (!((ifa->flags&IFA_F_PERMANENT) &&
4690 (ifa->prefered_lft == INFINITY_LIFE_TIME))) {
85486af0
TG		 4691 preferred = ifa->prefered_lft;
4692 valid = ifa->valid_lft;
4693 if (preferred != INFINITY_LIFE_TIME) {
1da177e4 4694 long tval = (jiffies - ifa->tstamp)/HZ;
a1faa698
JR		 4695 if (preferred > tval)
4696 preferred -= tval;
4697 else
4698 preferred = 0;
f56619fc
BH		 4699 if (valid != INFINITY_LIFE_TIME) {
4700 if (valid > tval)
4701 valid -= tval;
4702 else
4703 valid = 0;
4704 }
1da177e4
LT		 4705 }
4706 } else {
85486af0
TG		 4707 preferred = INFINITY_LIFE_TIME;
4708 valid = INFINITY_LIFE_TIME;
4709 }
4710
7996c799 4711 if (!ipv6_addr_any(&ifa->peer_addr)) {
930345ea
JB		 4712 if (nla_put_in6_addr(skb, IFA_LOCAL, &ifa->addr) < 0 ||
4713 nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->peer_addr) < 0)
caeaba79
ND		 4714 goto error;
4715 } else
930345ea 4716 if (nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->addr) < 0)
caeaba79
ND		 4717 goto error;
4718
4719 if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0)
4720 goto error;
1da177e4 4721
479840ff
JP		 4722 if (nla_put_u32(skb, IFA_FLAGS, ifa->flags) < 0)
4723 goto error;
4724
053c095a
JB		 4725 nlmsg_end(skb, nlh);
4726 return 0;
caeaba79
ND		 4727
4728error:
4729 nlmsg_cancel(skb, nlh);
4730 return -EMSGSIZE;
1da177e4
LT		 4731}
4732
4733static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
15e47304 4734 u32 portid, u32 seq, int event, u16 flags)
1da177e4 4735{
1da177e4 4736 struct nlmsghdr *nlh;
101bb229
TG		 4737 u8 scope = RT_SCOPE_UNIVERSE;
4738 int ifindex = ifmca->idev->dev->ifindex;
4739
4740 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
4741 scope = RT_SCOPE_SITE;
1da177e4 4742
15e47304 4743 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
63159f29 4744 if (!nlh)
26932566 4745 return -EMSGSIZE;
85486af0 4746
0ab6803b 4747 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
930345ea 4748 if (nla_put_in6_addr(skb, IFA_MULTICAST, &ifmca->mca_addr) < 0 ||
0ab6803b 4749 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
26932566
PM		 4750 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
4751 nlmsg_cancel(skb, nlh);
4752 return -EMSGSIZE;
4753 }
85486af0 4754
053c095a
JB		 4755 nlmsg_end(skb, nlh);
4756 return 0;
1da177e4
LT		 4757}
4758
4759static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
15e47304 4760 u32 portid, u32 seq, int event, unsigned int flags)
1da177e4 4761{
1da177e4 4762 struct nlmsghdr *nlh;
101bb229
TG		 4763 u8 scope = RT_SCOPE_UNIVERSE;
4764 int ifindex = ifaca->aca_idev->dev->ifindex;
4765
4766 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
4767 scope = RT_SCOPE_SITE;
1da177e4 4768
15e47304 4769 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
63159f29 4770 if (!nlh)
26932566 4771 return -EMSGSIZE;
85486af0 4772
0ab6803b 4773 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
930345ea 4774 if (nla_put_in6_addr(skb, IFA_ANYCAST, &ifaca->aca_addr) < 0 ||
0ab6803b 4775 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
26932566
PM		 4776 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
4777 nlmsg_cancel(skb, nlh);
4778 return -EMSGSIZE;
4779 }
1da177e4 4780
053c095a
JB		 4781 nlmsg_end(skb, nlh);
4782 return 0;
1da177e4
LT		 4783}
4784
e21e8467 4785enum addr_type_t {
1da177e4
LT		 4786 UNICAST_ADDR,
4787 MULTICAST_ADDR,
4788 ANYCAST_ADDR,
4789};
4790
234b27c3
ED		 4791/* called with rcu_read_lock() */
4792static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
4793 struct netlink_callback *cb, enum addr_type_t type,
4794 int s_ip_idx, int *p_ip_idx)
4795{
234b27c3
ED		 4796 struct ifmcaddr6 *ifmca;
4797 struct ifacaddr6 *ifaca;
4798 int err = 1;
4799 int ip_idx = *p_ip_idx;
4800
4801 read_lock_bh(&idev->lock);
4802 switch (type) {
502a2ffd 4803 case UNICAST_ADDR: {
4804 struct inet6_ifaddr *ifa;
4805
234b27c3 4806 /* unicast address incl. temp addr */
502a2ffd 4807 list_for_each_entry(ifa, &idev->addr_list, if_list) {
4808 if (++ip_idx < s_ip_idx)
234b27c3
ED		 4809 continue;
4810 err = inet6_fill_ifaddr(skb, ifa,
15e47304 4811 NETLINK_CB(cb->skb).portid,
234b27c3
ED		 4812 cb->nlh->nlmsg_seq,
4813 RTM_NEWADDR,
4814 NLM_F_MULTI);
053c095a 4815 if (err < 0)
234b27c3 4816 break;
63998ac2 4817 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
234b27c3
ED		 4818 }
4819 break;
502a2ffd 4820 }
234b27c3
ED		 4821 case MULTICAST_ADDR:
4822 /* multicast address */
4823 for (ifmca = idev->mc_list; ifmca;
4824 ifmca = ifmca->next, ip_idx++) {
4825 if (ip_idx < s_ip_idx)
4826 continue;
4827 err = inet6_fill_ifmcaddr(skb, ifmca,
15e47304 4828 NETLINK_CB(cb->skb).portid,
234b27c3
ED		 4829 cb->nlh->nlmsg_seq,
4830 RTM_GETMULTICAST,
4831 NLM_F_MULTI);
053c095a 4832 if (err < 0)
234b27c3
ED		 4833 break;
4834 }
4835 break;
4836 case ANYCAST_ADDR:
4837 /* anycast address */
4838 for (ifaca = idev->ac_list; ifaca;
4839 ifaca = ifaca->aca_next, ip_idx++) {
4840 if (ip_idx < s_ip_idx)
4841 continue;
4842 err = inet6_fill_ifacaddr(skb, ifaca,
15e47304 4843 NETLINK_CB(cb->skb).portid,
234b27c3
ED		 4844 cb->nlh->nlmsg_seq,
4845 RTM_GETANYCAST,
4846 NLM_F_MULTI);
053c095a 4847 if (err < 0)
234b27c3
ED		 4848 break;
4849 }
4850 break;
4851 default:
4852 break;
4853 }
4854 read_unlock_bh(&idev->lock);
4855 *p_ip_idx = ip_idx;
4856 return err;
4857}
4858
1da177e4
LT		 4859static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
4860 enum addr_type_t type)
4861{
234b27c3
ED		 4862 struct net *net = sock_net(skb->sk);
4863 int h, s_h;
1da177e4
LT		 4864 int idx, ip_idx;
4865 int s_idx, s_ip_idx;
1da177e4 4866 struct net_device *dev;
234b27c3
ED		 4867 struct inet6_dev *idev;
4868 struct hlist_head *head;
1ab1457c 4869
234b27c3
ED		 4870 s_h = cb->args[0];
4871 s_idx = idx = cb->args[1];
4872 s_ip_idx = ip_idx = cb->args[2];
5d5619b4 4873
234b27c3 4874 rcu_read_lock();
63998ac2 4875 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ net->dev_base_seq;
234b27c3
ED		 4876 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4877 idx = 0;
4878 head = &net->dev_index_head[h];
b67bfe0d 4879 hlist_for_each_entry_rcu(dev, head, index_hlist) {
234b27c3
ED		 4880 if (idx < s_idx)
4881 goto cont;
4b97efdf 4882 if (h > s_h || idx > s_idx)
234b27c3
ED		 4883 s_ip_idx = 0;
4884 ip_idx = 0;
e21e8467
SH		 4885 idev = __in6_dev_get(dev);
4886 if (!idev)
234b27c3
ED		 4887 goto cont;
4888
4889 if (in6_dump_addrs(idev, skb, cb, type,
7b46a644 4890 s_ip_idx, &ip_idx) < 0)
234b27c3 4891 goto done;
7562f876 4892cont:
234b27c3
ED		 4893 idx++;
4894 }
1da177e4 4895 }
234b27c3
ED		 4896done:
4897 rcu_read_unlock();
4898 cb->args[0] = h;
4899 cb->args[1] = idx;
4900 cb->args[2] = ip_idx;
4901
1da177e4
LT		 4902 return skb->len;
4903}
4904
4905static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
4906{
4907 enum addr_type_t type = UNICAST_ADDR;
b854272b 4908
1da177e4
LT		 4909 return inet6_dump_addr(skb, cb, type);
4910}
4911
4912static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
4913{
4914 enum addr_type_t type = MULTICAST_ADDR;
b854272b 4915
1da177e4
LT		 4916 return inet6_dump_addr(skb, cb, type);
4917}
4918
4919
4920static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
4921{
4922 enum addr_type_t type = ANYCAST_ADDR;
b854272b 4923
1da177e4
LT		 4924 return inet6_dump_addr(skb, cb, type);
4925}
4926
c21ef3e3
DA		 4927static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh,
4928 struct netlink_ext_ack *extack)
6c223828 4929{
3b1e0a65 4930 struct net *net = sock_net(in_skb->sk);
1b29fc2c
TG		 4931 struct ifaddrmsg *ifm;
4932 struct nlattr *tb[IFA_MAX+1];
caeaba79 4933 struct in6_addr *addr = NULL, *peer;
6c223828
NT		 4934 struct net_device *dev = NULL;
4935 struct inet6_ifaddr *ifa;
4936 struct sk_buff *skb;
6c223828
NT		 4937 int err;
4938
fceb6435 4939 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy,
c21ef3e3 4940 extack);
1b29fc2c 4941 if (err < 0)
c24675f8 4942 return err;
1b29fc2c 4943
caeaba79 4944 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer);
c24675f8
FW		 4945 if (!addr)
4946 return -EINVAL;
6c223828 4947
1b29fc2c 4948 ifm = nlmsg_data(nlh);
6c223828 4949 if (ifm->ifa_index)
c24675f8 4950 dev = dev_get_by_index(net, ifm->ifa_index);
6c223828 4951
e21e8467
SH		 4952 ifa = ipv6_get_ifaddr(net, addr, dev, 1);
4953 if (!ifa) {
1b29fc2c
TG		 4954 err = -EADDRNOTAVAIL;
4955 goto errout;
4956 }
6c223828 4957
e21e8467
SH		 4958 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
4959 if (!skb) {
6c223828 4960 err = -ENOBUFS;
1b29fc2c 4961 goto errout_ifa;
6c223828
NT		 4962 }
4963
15e47304 4964 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).portid,
6c223828 4965 nlh->nlmsg_seq, RTM_NEWADDR, 0);
26932566
PM		 4966 if (err < 0) {
4967 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4968 WARN_ON(err == -EMSGSIZE);
4969 kfree_skb(skb);
4970 goto errout_ifa;
4971 }
15e47304 4972 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
1b29fc2c 4973errout_ifa:
6c223828 4974 in6_ifa_put(ifa);
1b29fc2c 4975errout:
c24675f8
FW		 4976 if (dev)
4977 dev_put(dev);
6c223828 4978 return err;
6c223828
NT		 4979}
4980
1da177e4
LT		 4981static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
4982{
4983 struct sk_buff *skb;
c346dca1 4984 struct net *net = dev_net(ifa->idev->dev);
5d620266 4985 int err = -ENOBUFS;
1da177e4 4986
f784ad3d
MB		 4987 /* Don't send DELADDR notification for TENTATIVE address,
4988 * since NEWADDR notification is sent only after removing
6819a14e 4989 * TENTATIVE flag, if DAD has not failed.
f784ad3d 4990 */
6819a14e
MM		 4991 if (ifa->flags & IFA_F_TENTATIVE && !(ifa->flags & IFA_F_DADFAILED) &&
4992 event == RTM_DELADDR)
f784ad3d
MB		 4993 return;
4994
0ab6803b 4995 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
63159f29 4996 if (!skb)
5d620266
TG		 4997 goto errout;
4998
4999 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
26932566
PM		 5000 if (err < 0) {
5001 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
5002 WARN_ON(err == -EMSGSIZE);
5003 kfree_skb(skb);
5004 goto errout;
5005 }
1ce85fe4
PNA		 5006 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
5007 return;
5d620266
TG		 5008errout:
5009 if (err < 0)
6fda7350 5010 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
1da177e4
LT		 5011}
5012
b6f99a21 5013static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
1da177e4
LT		 5014 __s32 *array, int bytes)
5015{
04561c1f
TG		 5016 BUG_ON(bytes < (DEVCONF_MAX * 4));
5017
1da177e4
LT		 5018 memset(array, 0, bytes);
5019 array[DEVCONF_FORWARDING] = cnf->forwarding;
5020 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
5021 array[DEVCONF_MTU6] = cnf->mtu6;
5022 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
5023 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
5024 array[DEVCONF_AUTOCONF] = cnf->autoconf;
5025 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
5026 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
93908d19
TG		 5027 array[DEVCONF_RTR_SOLICIT_INTERVAL] =
5028 jiffies_to_msecs(cnf->rtr_solicit_interval);
bd11f074
MŻ		 5029 array[DEVCONF_RTR_SOLICIT_MAX_INTERVAL] =
5030 jiffies_to_msecs(cnf->rtr_solicit_max_interval);
93908d19
TG		 5031 array[DEVCONF_RTR_SOLICIT_DELAY] =
5032 jiffies_to_msecs(cnf->rtr_solicit_delay);
1da177e4 5033 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
fc4eba58
HFS		 5034 array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] =
5035 jiffies_to_msecs(cnf->mldv1_unsolicited_report_interval);
5036 array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] =
5037 jiffies_to_msecs(cnf->mldv2_unsolicited_report_interval);
1da177e4
LT		 5038 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
5039 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
5040 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
5041 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
5042 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
1da177e4 5043 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
65f5c7c1 5044 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
8013d1d7 5045 array[DEVCONF_ACCEPT_RA_MIN_HOP_LIMIT] = cnf->accept_ra_min_hop_limit;
c4fd30eb 5046 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
930d6ff2
YH		 5047#ifdef CONFIG_IPV6_ROUTER_PREF
5048 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
93908d19
TG		 5049 array[DEVCONF_RTR_PROBE_INTERVAL] =
5050 jiffies_to_msecs(cnf->rtr_probe_interval);
fa03ef38 5051#ifdef CONFIG_IPV6_ROUTE_INFO
bbea124b 5052 array[DEVCONF_ACCEPT_RA_RT_INFO_MIN_PLEN] = cnf->accept_ra_rt_info_min_plen;
09c884d4
YH		 5053 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
5054#endif
930d6ff2 5055#endif
fbea49e1 5056 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
0bcbc926 5057 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
95c385b4
NH		 5058#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
5059 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
7fd2561e 5060 array[DEVCONF_USE_OPTIMISTIC] = cnf->use_optimistic;
95c385b4 5061#endif
7bc570c8
YH		 5062#ifdef CONFIG_IPV6_MROUTE
5063 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
5064#endif
778d80be 5065 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
1b34be74 5066 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
c3faca05 5067 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
5cb04436 5068 array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify;
b800c3b9 5069 array[DEVCONF_SUPPRESS_FRAG_NDISC] = cnf->suppress_frag_ndisc;
d9333196 5070 array[DEVCONF_ACCEPT_RA_FROM_LOCAL] = cnf->accept_ra_from_local;
c2943f14 5071 array[DEVCONF_ACCEPT_RA_MTU] = cnf->accept_ra_mtu;
35103d11 5072 array[DEVCONF_IGNORE_ROUTES_WITH_LINKDOWN] = cnf->ignore_routes_with_linkdown;
3d1bec99 5073 /* we omit DEVCONF_STABLE_SECRET for now */
3985e8a3 5074 array[DEVCONF_USE_OIF_ADDRS_ONLY] = cnf->use_oif_addrs_only;
abbc3043 5075 array[DEVCONF_DROP_UNICAST_IN_L2_MULTICAST] = cnf->drop_unicast_in_l2_multicast;
7a02bf89 5076 array[DEVCONF_DROP_UNSOLICITED_NA] = cnf->drop_unsolicited_na;
f1705ec1 5077 array[DEVCONF_KEEP_ADDR_ON_DOWN] = cnf->keep_addr_on_down;
1ababeba 5078 array[DEVCONF_SEG6_ENABLED] = cnf->seg6_enabled;
bf355b8d
DL		 5079#ifdef CONFIG_IPV6_SEG6_HMAC
5080 array[DEVCONF_SEG6_REQUIRE_HMAC] = cnf->seg6_require_hmac;
5081#endif
adc176c5 5082 array[DEVCONF_ENHANCED_DAD] = cnf->enhanced_dad;
d35a00b8 5083 array[DEVCONF_ADDR_GEN_MODE] = cnf->addr_gen_mode;
df789fe7 5084 array[DEVCONF_DISABLE_POLICY] = cnf->disable_policy;
2210d6b2 5085 array[DEVCONF_NDISC_TCLASS] = cnf->ndisc_tclass;
1da177e4
LT		 5086}
5087
b382b191
TG		 5088static inline size_t inet6_ifla6_size(void)
5089{
5090 return nla_total_size(4) /* IFLA_INET6_FLAGS */
5091 + nla_total_size(sizeof(struct ifla_cacheinfo))
5092 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
5093 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
f53adae4
DB		 5094 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
5095 + nla_total_size(sizeof(struct in6_addr)); /* IFLA_INET6_TOKEN */
b382b191
TG		 5096}
5097
339bf98f
TG		 5098static inline size_t inet6_if_nlmsg_size(void)
5099{
5100 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
5101 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
5102 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
5103 + nla_total_size(4) /* IFLA_MTU */
5104 + nla_total_size(4) /* IFLA_LINK */
0344338b 5105 + nla_total_size(1) /* IFLA_OPERSTATE */
b382b191 5106 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */
339bf98f 5107}
c5396a31 5108
be281e55 5109static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib,
aca05671 5110 int bytes)
7f7d9a6b
HX		 5111{
5112 int i;
aca05671 5113 int pad = bytes - sizeof(u64) * ICMP6_MIB_MAX;
7f7d9a6b
HX		 5114 BUG_ON(pad < 0);
5115
5116 /* Use put_unaligned() because stats may not be aligned for u64. */
aca05671
JH		 5117 put_unaligned(ICMP6_MIB_MAX, &stats[0]);
5118 for (i = 1; i < ICMP6_MIB_MAX; i++)
be281e55 5119 put_unaligned(atomic_long_read(&mib[i]), &stats[i]);
7f7d9a6b 5120
aca05671 5121 memset(&stats[ICMP6_MIB_MAX], 0, pad);
7f7d9a6b
HX		 5122}
5123
698365fa 5124static inline void __snmp6_fill_stats64(u64 *stats, void __percpu *mib,
a3a77372 5125 int bytes, size_t syncpoff)
4ce3c183 5126{
a3a77372
R		 5127 int i, c;
5128 u64 buff[IPSTATS_MIB_MAX];
5129 int pad = bytes - sizeof(u64) * IPSTATS_MIB_MAX;
5130
4ce3c183
ED		 5131 BUG_ON(pad < 0);
5132
a3a77372
R		 5133 memset(buff, 0, sizeof(buff));
5134 buff[0] = IPSTATS_MIB_MAX;
4ce3c183 5135
a3a77372
R		 5136 for_each_possible_cpu(c) {
5137 for (i = 1; i < IPSTATS_MIB_MAX; i++)
5138 buff[i] += snmp_get_cpu_field64(mib, c, i, syncpoff);
5139 }
5140
5141 memcpy(stats, buff, IPSTATS_MIB_MAX * sizeof(u64));
5142 memset(&stats[IPSTATS_MIB_MAX], 0, pad);
4ce3c183
ED		 5143}
5144
7f7d9a6b
HX		 5145static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
5146 int bytes)
5147{
e21e8467 5148 switch (attrtype) {
7f7d9a6b 5149 case IFLA_INET6_STATS:
a3a77372
R		 5150 __snmp6_fill_stats64(stats, idev->stats.ipv6, bytes,
5151 offsetof(struct ipstats_mib, syncp));
7f7d9a6b
HX		 5152 break;
5153 case IFLA_INET6_ICMP6STATS:
aca05671 5154 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, bytes);
7f7d9a6b
HX		 5155 break;
5156 }
5157}
5158
d5566fd7
SV		 5159static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev,
5160 u32 ext_filter_mask)
b382b191
TG		 5161{
5162 struct nlattr *nla;
5163 struct ifla_cacheinfo ci;
5164
c78679e8
DM		 5165 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags))
5166 goto nla_put_failure;
b382b191 5167 ci.max_reasm_len = IPV6_MAXPLEN;
24912420
DM		 5168 ci.tstamp = cstamp_delta(idev->tstamp);
5169 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time);
1f9248e5 5170 ci.retrans_time = jiffies_to_msecs(NEIGH_VAR(idev->nd_parms, RETRANS_TIME));
c78679e8
DM		 5171 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci))
5172 goto nla_put_failure;
b382b191 5173 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
63159f29 5174 if (!nla)
b382b191
TG		 5175 goto nla_put_failure;
5176 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
5177
5178 /* XXX - MC not implemented */
5179
d5566fd7
SV		 5180 if (ext_filter_mask & RTEXT_FILTER_SKIP_STATS)
5181 return 0;
5182
b382b191 5183 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
63159f29 5184 if (!nla)
b382b191
TG		 5185 goto nla_put_failure;
5186 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
5187
5188 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
63159f29 5189 if (!nla)
b382b191
TG		 5190 goto nla_put_failure;
5191 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
5192
f53adae4 5193 nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr));
63159f29 5194 if (!nla)
f53adae4 5195 goto nla_put_failure;
bc91b0f0 5196
d35a00b8 5197 if (nla_put_u8(skb, IFLA_INET6_ADDR_GEN_MODE, idev->cnf.addr_gen_mode))
bc91b0f0
JP		 5198 goto nla_put_failure;
5199
f53adae4
DB		 5200 read_lock_bh(&idev->lock);
5201 memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla));
5202 read_unlock_bh(&idev->lock);
5203
b382b191
TG		 5204 return 0;
5205
5206nla_put_failure:
5207 return -EMSGSIZE;
5208}
5209
b1974ed0
AR		 5210static size_t inet6_get_link_af_size(const struct net_device *dev,
5211 u32 ext_filter_mask)
b382b191
TG		 5212{
5213 if (!__in6_dev_get(dev))
5214 return 0;
5215
5216 return inet6_ifla6_size();
5217}
5218
d5566fd7
SV		 5219static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev,
5220 u32 ext_filter_mask)
b382b191
TG		 5221{
5222 struct inet6_dev *idev = __in6_dev_get(dev);
5223
5224 if (!idev)
5225 return -ENODATA;
5226
d5566fd7 5227 if (inet6_fill_ifla6_attrs(skb, idev, ext_filter_mask) < 0)
b382b191
TG		 5228 return -EMSGSIZE;
5229
5230 return 0;
5231}
5232
f53adae4
DB		 5233static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token)
5234{
f53adae4
DB		 5235 struct inet6_ifaddr *ifp;
5236 struct net_device *dev = idev->dev;
47e27d5e 5237 bool clear_token, update_rs = false;
dc848292 5238 struct in6_addr ll_addr;
f53adae4 5239
c15b1cca
HFS		 5240 ASSERT_RTNL();
5241
63159f29 5242 if (!token)
f53adae4 5243 return -EINVAL;
f53adae4
DB		 5244 if (dev->flags & (IFF_LOOPBACK | IFF_NOARP))
5245 return -EINVAL;
f53adae4
DB		 5246 if (!ipv6_accept_ra(idev))
5247 return -EINVAL;
bd11f074 5248 if (idev->cnf.rtr_solicits == 0)
f53adae4
DB		 5249 return -EINVAL;
5250
5251 write_lock_bh(&idev->lock);
5252
5253 BUILD_BUG_ON(sizeof(token->s6_addr) != 16);
5254 memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8);
5255
5256 write_unlock_bh(&idev->lock);
5257
47e27d5e
DB		 5258 clear_token = ipv6_addr_any(token);
5259 if (clear_token)
5260 goto update_lft;
5261
dc848292
HFS		 5262 if (!idev->dead && (idev->if_flags & IF_READY) &&
5263 !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE |
5264 IFA_F_OPTIMISTIC)) {
fc403832
DB		 5265 /* If we're not ready, then normal ifup will take care
5266 * of this. Otherwise, we need to request our rs here.
5267 */
5268 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters);
5269 update_rs = true;
5270 }
f53adae4 5271
47e27d5e 5272update_lft:
f53adae4 5273 write_lock_bh(&idev->lock);
fc403832 5274
77ecaace 5275 if (update_rs) {
fc403832 5276 idev->if_flags |= IF_RS_SENT;
bd11f074
MŻ		 5277 idev->rs_interval = rfc3315_s14_backoff_init(
5278 idev->cnf.rtr_solicit_interval);
77ecaace 5279 idev->rs_probes = 1;
bd11f074 5280 addrconf_mod_rs_timer(idev, idev->rs_interval);
77ecaace 5281 }
f53adae4
DB		 5282
5283 /* Well, that's kinda nasty ... */
5284 list_for_each_entry(ifp, &idev->addr_list, if_list) {
5285 spin_lock(&ifp->lock);
617fe29d 5286 if (ifp->tokenized) {
f53adae4
DB		 5287 ifp->valid_lft = 0;
5288 ifp->prefered_lft = 0;
5289 }
5290 spin_unlock(&ifp->lock);
5291 }
5292
5293 write_unlock_bh(&idev->lock);
b2ed64a9 5294 inet6_ifinfo_notify(RTM_NEWLINK, idev);
c15b1cca 5295 addrconf_verify_rtnl();
f53adae4
DB		 5296 return 0;
5297}
5298
11b1f828
DB		 5299static const struct nla_policy inet6_af_policy[IFLA_INET6_MAX + 1] = {
5300 [IFLA_INET6_ADDR_GEN_MODE] = { .type = NLA_U8 },
5301 [IFLA_INET6_TOKEN] = { .len = sizeof(struct in6_addr) },
5302};
5303
5304static int inet6_validate_link_af(const struct net_device *dev,
5305 const struct nlattr *nla)
5306{
5307 struct nlattr *tb[IFLA_INET6_MAX + 1];
5308
5309 if (dev && !__in6_dev_get(dev))
5310 return -EAFNOSUPPORT;
5311
fceb6435
JB		 5312 return nla_parse_nested(tb, IFLA_INET6_MAX, nla, inet6_af_policy,
5313 NULL);
11b1f828
DB		 5314}
5315
d35a00b8
FJ		 5316static int check_addr_gen_mode(int mode)
5317{
5318 if (mode != IN6_ADDR_GEN_MODE_EUI64 &&
5319 mode != IN6_ADDR_GEN_MODE_NONE &&
5320 mode != IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
5321 mode != IN6_ADDR_GEN_MODE_RANDOM)
5322 return -EINVAL;
5323 return 1;
5324}
5325
5326static int check_stable_privacy(struct inet6_dev *idev, struct net *net,
5327 int mode)
5328{
5329 if (mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
5330 !idev->cnf.stable_secret.initialized &&
5331 !net->ipv6.devconf_dflt->stable_secret.initialized)
5332 return -EINVAL;
5333 return 1;
5334}
5335
f53adae4
DB		 5336static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla)
5337{
5338 int err = -EINVAL;
5339 struct inet6_dev *idev = __in6_dev_get(dev);
5340 struct nlattr *tb[IFLA_INET6_MAX + 1];
5341
5342 if (!idev)
5343 return -EAFNOSUPPORT;
5344
fceb6435 5345 if (nla_parse_nested(tb, IFLA_INET6_MAX, nla, NULL, NULL) < 0)
f53adae4
DB		 5346 BUG();
5347
bc91b0f0 5348 if (tb[IFLA_INET6_TOKEN]) {
f53adae4 5349 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN]));
bc91b0f0
JP		 5350 if (err)
5351 return err;
5352 }
5353
5354 if (tb[IFLA_INET6_ADDR_GEN_MODE]) {
5355 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]);
5356
d35a00b8
FJ		 5357 if (check_addr_gen_mode(mode) < 0 ||
5358 check_stable_privacy(idev, dev_net(dev), mode) < 0)
bc91b0f0 5359 return -EINVAL;
622c81d5 5360
d35a00b8 5361 idev->cnf.addr_gen_mode = mode;
bc91b0f0
JP		 5362 err = 0;
5363 }
f53adae4
DB		 5364
5365 return err;
5366}
5367
1ab1457c 5368static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
15e47304 5369 u32 portid, u32 seq, int event, unsigned int flags)
1da177e4 5370{
04561c1f 5371 struct net_device *dev = idev->dev;
04561c1f
TG		 5372 struct ifinfomsg *hdr;
5373 struct nlmsghdr *nlh;
5374 void *protoinfo;
04561c1f 5375
15e47304 5376 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags);
63159f29 5377 if (!nlh)
26932566 5378 return -EMSGSIZE;
04561c1f
TG		 5379
5380 hdr = nlmsg_data(nlh);
5381 hdr->ifi_family = AF_INET6;
5382 hdr->__ifi_pad = 0;
5383 hdr->ifi_type = dev->type;
5384 hdr->ifi_index = dev->ifindex;
5385 hdr->ifi_flags = dev_get_flags(dev);
5386 hdr->ifi_change = 0;
5387
c78679e8
DM		 5388 if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
5389 (dev->addr_len &&
5390 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
5391 nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
a54acb3a 5392 (dev->ifindex != dev_get_iflink(dev) &&
0344338b
AG		 5393 nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))) ||
5394 nla_put_u8(skb, IFLA_OPERSTATE,
5395 netif_running(dev) ? dev->operstate : IF_OPER_DOWN))
c78679e8 5396 goto nla_put_failure;
04561c1f 5397 protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
63159f29 5398 if (!protoinfo)
04561c1f 5399 goto nla_put_failure;
1da177e4 5400
d5566fd7 5401 if (inet6_fill_ifla6_attrs(skb, idev, 0) < 0)
bf99f1bd 5402 goto nla_put_failure;
1da177e4 5403
04561c1f 5404 nla_nest_end(skb, protoinfo);
053c095a
JB		 5405 nlmsg_end(skb, nlh);
5406 return 0;
1da177e4 5407
04561c1f 5408nla_put_failure:
26932566
PM		 5409 nlmsg_cancel(skb, nlh);
5410 return -EMSGSIZE;
1da177e4
LT		 5411}
5412
5413static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
5414{
3b1e0a65 5415 struct net *net = sock_net(skb->sk);
84d2697d 5416 int h, s_h;
434a8a58 5417 int idx = 0, s_idx;
1da177e4
LT		 5418 struct net_device *dev;
5419 struct inet6_dev *idev;
84d2697d 5420 struct hlist_head *head;
1da177e4 5421
84d2697d
ED		 5422 s_h = cb->args[0];
5423 s_idx = cb->args[1];
5424
5425 rcu_read_lock();
5426 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
5427 idx = 0;
5428 head = &net->dev_index_head[h];
b67bfe0d 5429 hlist_for_each_entry_rcu(dev, head, index_hlist) {
84d2697d
ED		 5430 if (idx < s_idx)
5431 goto cont;
5432 idev = __in6_dev_get(dev);
5433 if (!idev)
5434 goto cont;
5435 if (inet6_fill_ifinfo(skb, idev,
15e47304 5436 NETLINK_CB(cb->skb).portid,
84d2697d 5437 cb->nlh->nlmsg_seq,
053c095a 5438 RTM_NEWLINK, NLM_F_MULTI) < 0)
84d2697d 5439 goto out;
7562f876 5440cont:
84d2697d
ED		 5441 idx++;
5442 }
1da177e4 5443 }
84d2697d
ED		 5444out:
5445 rcu_read_unlock();
5446 cb->args[1] = idx;
5447 cb->args[0] = h;
1da177e4
LT		 5448
5449 return skb->len;
5450}
5451
5452void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
5453{
5454 struct sk_buff *skb;
c346dca1 5455 struct net *net = dev_net(idev->dev);
8d7a76c9 5456 int err = -ENOBUFS;
1ab1457c 5457
339bf98f 5458 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
63159f29 5459 if (!skb)
8d7a76c9
TG		 5460 goto errout;
5461
5462 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
26932566
PM		 5463 if (err < 0) {
5464 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
5465 WARN_ON(err == -EMSGSIZE);
5466 kfree_skb(skb);
5467 goto errout;
5468 }
5f75a104 5469 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC);
1ce85fe4 5470 return;
8d7a76c9
TG		 5471errout:
5472 if (err < 0)
5f75a104 5473 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err);
1da177e4
LT		 5474}
5475
339bf98f
TG		 5476static inline size_t inet6_prefix_nlmsg_size(void)
5477{
5478 return NLMSG_ALIGN(sizeof(struct prefixmsg))
5479 + nla_total_size(sizeof(struct in6_addr))
5480 + nla_total_size(sizeof(struct prefix_cacheinfo));
5481}
c5396a31 5482
1da177e4 5483static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
15e47304 5484 struct prefix_info *pinfo, u32 portid, u32 seq,
6051e2f4 5485 int event, unsigned int flags)
1da177e4 5486{
6051e2f4
TG		 5487 struct prefixmsg *pmsg;
5488 struct nlmsghdr *nlh;
1da177e4
LT		 5489 struct prefix_cacheinfo ci;
5490
15e47304 5491 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags);
63159f29 5492 if (!nlh)
26932566 5493 return -EMSGSIZE;
6051e2f4
TG		 5494
5495 pmsg = nlmsg_data(nlh);
1da177e4 5496 pmsg->prefix_family = AF_INET6;
8a47077a
PM		 5497 pmsg->prefix_pad1 = 0;
5498 pmsg->prefix_pad2 = 0;
1da177e4
LT		 5499 pmsg->prefix_ifindex = idev->dev->ifindex;
5500 pmsg->prefix_len = pinfo->prefix_len;
5501 pmsg->prefix_type = pinfo->type;
8a47077a 5502 pmsg->prefix_pad3 = 0;
1da177e4
LT		 5503 pmsg->prefix_flags = 0;
5504 if (pinfo->onlink)
5505 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
5506 if (pinfo->autoconf)
5507 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
5508
c78679e8
DM		 5509 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix))
5510 goto nla_put_failure;
1da177e4
LT		 5511 ci.preferred_time = ntohl(pinfo->prefered);
5512 ci.valid_time = ntohl(pinfo->valid);
c78679e8
DM		 5513 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci))
5514 goto nla_put_failure;
053c095a
JB		 5515 nlmsg_end(skb, nlh);
5516 return 0;
1da177e4 5517
6051e2f4 5518nla_put_failure:
26932566
PM		 5519 nlmsg_cancel(skb, nlh);
5520 return -EMSGSIZE;
1da177e4
LT		 5521}
5522
1ab1457c 5523static void inet6_prefix_notify(int event, struct inet6_dev *idev,
1da177e4
LT		 5524 struct prefix_info *pinfo)
5525{
5526 struct sk_buff *skb;
c346dca1 5527 struct net *net = dev_net(idev->dev);
8c384bfa 5528 int err = -ENOBUFS;
1da177e4 5529
339bf98f 5530 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
63159f29 5531 if (!skb)
8c384bfa
TG		 5532 goto errout;
5533
5534 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
26932566
PM		 5535 if (err < 0) {
5536 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
5537 WARN_ON(err == -EMSGSIZE);
5538 kfree_skb(skb);
5539 goto errout;
5540 }
1ce85fe4
PNA		 5541 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
5542 return;
8c384bfa
TG		 5543errout:
5544 if (err < 0)
6fda7350 5545 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
1da177e4
LT		 5546}
5547
1da177e4
LT		 5548static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
5549{
63998ac2
ND		 5550 struct net *net = dev_net(ifp->idev->dev);
5551
c15b1cca
HFS		 5552 if (event)
5553 ASSERT_RTNL();
5554
1da177e4
LT		 5555 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
5556
5557 switch (event) {
5558 case RTM_NEWADDR:
95c385b4
NH		 5559 /*
5560 * If the address was optimistic
5561 * we inserted the route at the start of
5562 * our DAD process, so we don't need
5563 * to do it again
5564 */
4e587ea7 5565 if (!rcu_access_pointer(ifp->rt->rt6i_node))
95c385b4 5566 ip6_ins_rt(ifp->rt);
1da177e4
LT		 5567 if (ifp->idev->cnf.forwarding)
5568 addrconf_join_anycast(ifp);
7996c799 5569 if (!ipv6_addr_any(&ifp->peer_addr))
caeaba79
ND		 5570 addrconf_prefix_route(&ifp->peer_addr, 128,
5571 ifp->idev->dev, 0, 0);
1da177e4
LT		 5572 break;
5573 case RTM_DELADDR:
5574 if (ifp->idev->cnf.forwarding)
5575 addrconf_leave_anycast(ifp);
5576 addrconf_leave_solict(ifp->idev, &ifp->addr);
7996c799 5577 if (!ipv6_addr_any(&ifp->peer_addr)) {
caeaba79 5578 struct rt6_info *rt;
caeaba79 5579
e7478dfc
ND		 5580 rt = addrconf_get_prefix_route(&ifp->peer_addr, 128,
5581 ifp->idev->dev, 0, 0);
8e3d5be7
MKL		 5582 if (rt)
5583 ip6_del_rt(rt);
caeaba79 5584 }
38bd10c4 5585 if (ifp->rt) {
ad65a2f0
WW		 5586 if (dst_hold_safe(&ifp->rt->dst))
5587 ip6_del_rt(ifp->rt);
38bd10c4 5588 }
705f1c86 5589 rt_genid_bump_ipv6(net);
1da177e4
LT		 5590 break;
5591 }
63998ac2 5592 atomic_inc(&net->ipv6.dev_addr_genid);
1da177e4
LT		 5593}
5594
5595static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
5596{
8814c4b5 5597 rcu_read_lock_bh();
1da177e4
LT		 5598 if (likely(ifp->idev->dead == 0))
5599 __ipv6_ifa_notify(event, ifp);
8814c4b5 5600 rcu_read_unlock_bh();
1da177e4
LT		 5601}
5602
5603#ifdef CONFIG_SYSCTL
5604
5605static
fe2c6338 5606int addrconf_sysctl_forward(struct ctl_table *ctl, int write,
1da177e4
LT		 5607 void __user *buffer, size_t *lenp, loff_t *ppos)
5608{
5609 int *valp = ctl->data;
5610 int val = *valp;
88af182e 5611 loff_t pos = *ppos;
fe2c6338 5612 struct ctl_table lctl;
1da177e4
LT		 5613 int ret;
5614
013d97e9
FR		 5615 /*
5616 * ctl->data points to idev->cnf.forwarding, we should
5617 * not modify it until we get the rtnl lock.
5618 */
5619 lctl = *ctl;
5620 lctl.data = &val;
5621
5622 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
1da177e4 5623
c8fecf22 5624 if (write)
b325fddb 5625 ret = addrconf_fixup_forwarding(ctl, valp, val);
88af182e
EB		 5626 if (ret)
5627 *ppos = pos;
1ab1457c 5628 return ret;
1da177e4
LT		 5629}
5630
77751427
ML		 5631static
5632int addrconf_sysctl_mtu(struct ctl_table *ctl, int write,
5633 void __user *buffer, size_t *lenp, loff_t *ppos)
5634{
5635 struct inet6_dev *idev = ctl->extra1;
5636 int min_mtu = IPV6_MIN_MTU;
5637 struct ctl_table lctl;
5638
5639 lctl = *ctl;
5640 lctl.extra1 = &min_mtu;
5641 lctl.extra2 = idev ? &idev->dev->mtu : NULL;
5642
5643 return proc_dointvec_minmax(&lctl, write, buffer, lenp, ppos);
5644}
5645
56d417b1
BH		 5646static void dev_disable_change(struct inet6_dev *idev)
5647{
75538c2b
CW		 5648 struct netdev_notifier_info info;
5649
56d417b1
BH		 5650 if (!idev || !idev->dev)
5651 return;
5652
75538c2b 5653 netdev_notifier_info_init(&info, idev->dev);
56d417b1 5654 if (idev->cnf.disable_ipv6)
75538c2b 5655 addrconf_notify(NULL, NETDEV_DOWN, &info);
56d417b1 5656 else
75538c2b 5657 addrconf_notify(NULL, NETDEV_UP, &info);
56d417b1
BH		 5658}
5659
5660static void addrconf_disable_change(struct net *net, __s32 newf)
5661{
5662 struct net_device *dev;
5663 struct inet6_dev *idev;
5664
03e4deff 5665 for_each_netdev(net, dev) {
56d417b1
BH		 5666 idev = __in6_dev_get(dev);
5667 if (idev) {
5668 int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
5669 idev->cnf.disable_ipv6 = newf;
5670 if (changed)
5671 dev_disable_change(idev);
5672 }
56d417b1 5673 }
56d417b1
BH		 5674}
5675
013d97e9 5676static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf)
56d417b1
BH		 5677{
5678 struct net *net;
013d97e9
FR		 5679 int old;
5680
5681 if (!rtnl_trylock())
5682 return restart_syscall();
56d417b1
BH		 5683
5684 net = (struct net *)table->extra2;
013d97e9
FR		 5685 old = *p;
5686 *p = newf;
56d417b1 5687
013d97e9
FR		 5688 if (p == &net->ipv6.devconf_dflt->disable_ipv6) {
5689 rtnl_unlock();
56d417b1 5690 return 0;
88af182e 5691 }
56d417b1
BH		 5692
5693 if (p == &net->ipv6.devconf_all->disable_ipv6) {
56d417b1
BH		 5694 net->ipv6.devconf_dflt->disable_ipv6 = newf;
5695 addrconf_disable_change(net, newf);
013d97e9 5696 } else if ((!newf) ^ (!old))
56d417b1
BH		 5697 dev_disable_change((struct inet6_dev *)table->extra1);
5698
5699 rtnl_unlock();
5700 return 0;
5701}
5702
5703static
fe2c6338 5704int addrconf_sysctl_disable(struct ctl_table *ctl, int write,
56d417b1
BH		 5705 void __user *buffer, size_t *lenp, loff_t *ppos)
5706{
5707 int *valp = ctl->data;
5708 int val = *valp;
88af182e 5709 loff_t pos = *ppos;
fe2c6338 5710 struct ctl_table lctl;
56d417b1
BH		 5711 int ret;
5712
013d97e9
FR		 5713 /*
5714 * ctl->data points to idev->cnf.disable_ipv6, we should
5715 * not modify it until we get the rtnl lock.
5716 */
5717 lctl = *ctl;
5718 lctl.data = &val;
5719
5720 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
56d417b1
BH		 5721
5722 if (write)
5723 ret = addrconf_disable_ipv6(ctl, valp, val);
88af182e
EB		 5724 if (ret)
5725 *ppos = pos;
56d417b1
BH		 5726 return ret;
5727}
5728
c92d5491 5729static
5730int addrconf_sysctl_proxy_ndp(struct ctl_table *ctl, int write,
5731 void __user *buffer, size_t *lenp, loff_t *ppos)
5732{
5733 int *valp = ctl->data;
5734 int ret;
5735 int old, new;
5736
5737 old = *valp;
5738 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
5739 new = *valp;
5740
5741 if (write && old != new) {
5742 struct net *net = ctl->extra2;
5743
5744 if (!rtnl_trylock())
5745 return restart_syscall();
5746
5747 if (valp == &net->ipv6.devconf_dflt->proxy_ndp)
85b3daad
DA		 5748 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
5749 NETCONFA_PROXY_NEIGH,
c92d5491 5750 NETCONFA_IFINDEX_DEFAULT,
5751 net->ipv6.devconf_dflt);
5752 else if (valp == &net->ipv6.devconf_all->proxy_ndp)
85b3daad
DA		 5753 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
5754 NETCONFA_PROXY_NEIGH,
c92d5491 5755 NETCONFA_IFINDEX_ALL,
5756 net->ipv6.devconf_all);
5757 else {
5758 struct inet6_dev *idev = ctl->extra1;
5759
85b3daad
DA		 5760 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
5761 NETCONFA_PROXY_NEIGH,
c92d5491 5762 idev->dev->ifindex,
5763 &idev->cnf);
5764 }
5765 rtnl_unlock();
5766 }
5767
5768 return ret;
5769}
5770
d35a00b8
FJ		 5771static int addrconf_sysctl_addr_gen_mode(struct ctl_table *ctl, int write,
5772 void __user *buffer, size_t *lenp,
5773 loff_t *ppos)
5774{
5775 int ret = 0;
5776 int new_val;
5777 struct inet6_dev *idev = (struct inet6_dev *)ctl->extra1;
5778 struct net *net = (struct net *)ctl->extra2;
5779
8c171d6c
FJ		 5780 if (!rtnl_trylock())
5781 return restart_syscall();
5782
d35a00b8
FJ		 5783 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
5784
5785 if (write) {
5786 new_val = *((int *)ctl->data);
5787
8c171d6c
FJ		 5788 if (check_addr_gen_mode(new_val) < 0) {
5789 ret = -EINVAL;
5790 goto out;
5791 }
d35a00b8
FJ		 5792
5793 /* request for default */
5794 if (&net->ipv6.devconf_dflt->addr_gen_mode == ctl->data) {
5795 ipv6_devconf_dflt.addr_gen_mode = new_val;
5796
5797 /* request for individual net device */
5798 } else {
5799 if (!idev)
8c171d6c 5800 goto out;
d35a00b8 5801
8c171d6c
FJ		 5802 if (check_stable_privacy(idev, net, new_val) < 0) {
5803 ret = -EINVAL;
5804 goto out;
5805 }
d35a00b8
FJ		 5806
5807 if (idev->cnf.addr_gen_mode != new_val) {
5808 idev->cnf.addr_gen_mode = new_val;
d35a00b8 5809 addrconf_dev_config(idev->dev);
d35a00b8
FJ		 5810 }
5811 }
5812 }
5813
8c171d6c
FJ		 5814out:
5815 rtnl_unlock();
5816
d35a00b8
FJ		 5817 return ret;
5818}
5819
3d1bec99
HFS		 5820static int addrconf_sysctl_stable_secret(struct ctl_table *ctl, int write,
5821 void __user *buffer, size_t *lenp,
5822 loff_t *ppos)
5823{
5824 int err;
5825 struct in6_addr addr;
5826 char str[IPV6_MAX_STRLEN];
5827 struct ctl_table lctl = *ctl;
622c81d5 5828 struct net *net = ctl->extra2;
3d1bec99
HFS		 5829 struct ipv6_stable_secret *secret = ctl->data;
5830
622c81d5
HFS		 5831 if (&net->ipv6.devconf_all->stable_secret == ctl->data)
5832 return -EIO;
5833
3d1bec99
HFS		 5834 lctl.maxlen = IPV6_MAX_STRLEN;
5835 lctl.data = str;
5836
5837 if (!rtnl_trylock())
5838 return restart_syscall();
5839
5840 if (!write && !secret->initialized) {
5841 err = -EIO;
5842 goto out;
5843 }
5844
5449a5ca
WC		 5845 err = snprintf(str, sizeof(str), "%pI6", &secret->secret);
5846 if (err >= sizeof(str)) {
5847 err = -EIO;
5848 goto out;
3d1bec99
HFS		 5849 }
5850
5851 err = proc_dostring(&lctl, write, buffer, lenp, ppos);
5852 if (err || !write)
5853 goto out;
5854
5855 if (in6_pton(str, -1, addr.in6_u.u6_addr8, -1, NULL) != 1) {
5856 err = -EIO;
5857 goto out;
5858 }
5859
5860 secret->initialized = true;
5861 secret->secret = addr;
5862
622c81d5
HFS		 5863 if (&net->ipv6.devconf_dflt->stable_secret == ctl->data) {
5864 struct net_device *dev;
5865
5866 for_each_netdev(net, dev) {
5867 struct inet6_dev *idev = __in6_dev_get(dev);
5868
5869 if (idev) {
d35a00b8 5870 idev->cnf.addr_gen_mode =
622c81d5
HFS		 5871 IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
5872 }
5873 }
5874 } else {
5875 struct inet6_dev *idev = ctl->extra1;
5876
d35a00b8 5877 idev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
622c81d5
HFS		 5878 }
5879
3d1bec99
HFS		 5880out:
5881 rtnl_unlock();
5882
5883 return err;
5884}
c92d5491 5885
35103d11
AG		 5886static
5887int addrconf_sysctl_ignore_routes_with_linkdown(struct ctl_table *ctl,
5888 int write,
5889 void __user *buffer,
5890 size_t *lenp,
5891 loff_t *ppos)
5892{
5893 int *valp = ctl->data;
5894 int val = *valp;
5895 loff_t pos = *ppos;
5896 struct ctl_table lctl;
5897 int ret;
5898
5899 /* ctl->data points to idev->cnf.ignore_routes_when_linkdown
5900 * we should not modify it until we get the rtnl lock.
5901 */
5902 lctl = *ctl;
5903 lctl.data = &val;
5904
5905 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
5906
5907 if (write)
5908 ret = addrconf_fixup_linkdown(ctl, valp, val);
5909 if (ret)
5910 *ppos = pos;
5911 return ret;
5912}
5913
df789fe7
DF		 5914static
5915void addrconf_set_nopolicy(struct rt6_info *rt, int action)
5916{
5917 if (rt) {
5918 if (action)
5919 rt->dst.flags |= DST_NOPOLICY;
5920 else
5921 rt->dst.flags &= ~DST_NOPOLICY;
5922 }
5923}
5924
5925static
5926void addrconf_disable_policy_idev(struct inet6_dev *idev, int val)
5927{
5928 struct inet6_ifaddr *ifa;
5929
5930 read_lock_bh(&idev->lock);
5931 list_for_each_entry(ifa, &idev->addr_list, if_list) {
5932 spin_lock(&ifa->lock);
5933 if (ifa->rt) {
5934 struct rt6_info *rt = ifa->rt;
df789fe7
DF		 5935 int cpu;
5936
66f5d6ce 5937 rcu_read_lock();
df789fe7
DF		 5938 addrconf_set_nopolicy(ifa->rt, val);
5939 if (rt->rt6i_pcpu) {
5940 for_each_possible_cpu(cpu) {
5941 struct rt6_info **rtp;
5942
5943 rtp = per_cpu_ptr(rt->rt6i_pcpu, cpu);
5944 addrconf_set_nopolicy(*rtp, val);
5945 }
5946 }
66f5d6ce 5947 rcu_read_unlock();
df789fe7
DF		 5948 }
5949 spin_unlock(&ifa->lock);
5950 }
5951 read_unlock_bh(&idev->lock);
5952}
5953
5954static
5955int addrconf_disable_policy(struct ctl_table *ctl, int *valp, int val)
5956{
5957 struct inet6_dev *idev;
5958 struct net *net;
5959
5960 if (!rtnl_trylock())
5961 return restart_syscall();
5962
5963 *valp = val;
5964
5965 net = (struct net *)ctl->extra2;
5966 if (valp == &net->ipv6.devconf_dflt->disable_policy) {
5967 rtnl_unlock();
5968 return 0;
5969 }
5970
5971 if (valp == &net->ipv6.devconf_all->disable_policy) {
5972 struct net_device *dev;
5973
5974 for_each_netdev(net, dev) {
5975 idev = __in6_dev_get(dev);
5976 if (idev)
5977 addrconf_disable_policy_idev(idev, val);
5978 }
5979 } else {
5980 idev = (struct inet6_dev *)ctl->extra1;
5981 addrconf_disable_policy_idev(idev, val);
5982 }
5983
5984 rtnl_unlock();
5985 return 0;
5986}
5987
5988static
5989int addrconf_sysctl_disable_policy(struct ctl_table *ctl, int write,
5990 void __user *buffer, size_t *lenp,
5991 loff_t *ppos)
5992{
5993 int *valp = ctl->data;
5994 int val = *valp;
5995 loff_t pos = *ppos;
5996 struct ctl_table lctl;
5997 int ret;
5998
5999 lctl = *ctl;
6000 lctl.data = &val;
6001 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
6002
6003 if (write && (*valp != val))
6004 ret = addrconf_disable_policy(ctl, valp, val);
6005
6006 if (ret)
6007 *ppos = pos;
6008
6009 return ret;
6010}
6011
cb4a4c69 6012static int minus_one = -1;
2210d6b2 6013static const int zero = 0;
cb9e684e
MŻ		 6014static const int one = 1;
6015static const int two_five_five = 255;
6016
607ea7cd 6017static const struct ctl_table addrconf_sysctl[] = {
5df1f77f
KK		 6018 {
6019 .procname = "forwarding",
6020 .data = &ipv6_devconf.forwarding,
6021 .maxlen = sizeof(int),
6022 .mode = 0644,
6023 .proc_handler = addrconf_sysctl_forward,
6024 },
6025 {
6026 .procname = "hop_limit",
6027 .data = &ipv6_devconf.hop_limit,
6028 .maxlen = sizeof(int),
6029 .mode = 0644,
cb9e684e
MŻ		 6030 .proc_handler = proc_dointvec_minmax,
6031 .extra1 = (void *)&one,
6032 .extra2 = (void *)&two_five_five,
5df1f77f
KK		 6033 },
6034 {
6035 .procname = "mtu",
6036 .data = &ipv6_devconf.mtu6,
6037 .maxlen = sizeof(int),
6038 .mode = 0644,
6039 .proc_handler = addrconf_sysctl_mtu,
6040 },
6041 {
6042 .procname = "accept_ra",
6043 .data = &ipv6_devconf.accept_ra,
6044 .maxlen = sizeof(int),
6045 .mode = 0644,
6046 .proc_handler = proc_dointvec,
6047 },
6048 {
6049 .procname = "accept_redirects",
6050 .data = &ipv6_devconf.accept_redirects,
6051 .maxlen = sizeof(int),
6052 .mode = 0644,
6053 .proc_handler = proc_dointvec,
6054 },
6055 {
6056 .procname = "autoconf",
6057 .data = &ipv6_devconf.autoconf,
6058 .maxlen = sizeof(int),
6059 .mode = 0644,
6060 .proc_handler = proc_dointvec,
6061 },
6062 {
6063 .procname = "dad_transmits",
6064 .data = &ipv6_devconf.dad_transmits,
6065 .maxlen = sizeof(int),
6066 .mode = 0644,
6067 .proc_handler = proc_dointvec,
6068 },
6069 {
6070 .procname = "router_solicitations",
6071 .data = &ipv6_devconf.rtr_solicits,
6072 .maxlen = sizeof(int),
6073 .mode = 0644,
cb4a4c69
MŻ		 6074 .proc_handler = proc_dointvec_minmax,
6075 .extra1 = &minus_one,
5df1f77f
KK		 6076 },
6077 {
6078 .procname = "router_solicitation_interval",
6079 .data = &ipv6_devconf.rtr_solicit_interval,
6080 .maxlen = sizeof(int),
6081 .mode = 0644,
6082 .proc_handler = proc_dointvec_jiffies,
6083 },
bd11f074
MŻ		 6084 {
6085 .procname = "router_solicitation_max_interval",
6086 .data = &ipv6_devconf.rtr_solicit_max_interval,
6087 .maxlen = sizeof(int),
6088 .mode = 0644,
6089 .proc_handler = proc_dointvec_jiffies,
6090 },
5df1f77f
KK		 6091 {
6092 .procname = "router_solicitation_delay",
6093 .data = &ipv6_devconf.rtr_solicit_delay,
6094 .maxlen = sizeof(int),
6095 .mode = 0644,
6096 .proc_handler = proc_dointvec_jiffies,
6097 },
6098 {
6099 .procname = "force_mld_version",
6100 .data = &ipv6_devconf.force_mld_version,
6101 .maxlen = sizeof(int),
6102 .mode = 0644,
6103 .proc_handler = proc_dointvec,
6104 },
6105 {
6106 .procname = "mldv1_unsolicited_report_interval",
6107 .data =
6108 &ipv6_devconf.mldv1_unsolicited_report_interval,
6109 .maxlen = sizeof(int),
6110 .mode = 0644,
6111 .proc_handler = proc_dointvec_ms_jiffies,
6112 },
6113 {
6114 .procname = "mldv2_unsolicited_report_interval",
6115 .data =
6116 &ipv6_devconf.mldv2_unsolicited_report_interval,
6117 .maxlen = sizeof(int),
6118 .mode = 0644,
6119 .proc_handler = proc_dointvec_ms_jiffies,
6120 },
6121 {
6122 .procname = "use_tempaddr",
6123 .data = &ipv6_devconf.use_tempaddr,
6124 .maxlen = sizeof(int),
6125 .mode = 0644,
6126 .proc_handler = proc_dointvec,
6127 },
6128 {
6129 .procname = "temp_valid_lft",
6130 .data = &ipv6_devconf.temp_valid_lft,
6131 .maxlen = sizeof(int),
6132 .mode = 0644,
6133 .proc_handler = proc_dointvec,
6134 },
6135 {
6136 .procname = "temp_prefered_lft",
6137 .data = &ipv6_devconf.temp_prefered_lft,
6138 .maxlen = sizeof(int),
6139 .mode = 0644,
6140 .proc_handler = proc_dointvec,
6141 },
6142 {
6143 .procname = "regen_max_retry",
6144 .data = &ipv6_devconf.regen_max_retry,
6145 .maxlen = sizeof(int),
6146 .mode = 0644,
6147 .proc_handler = proc_dointvec,
6148 },
6149 {
6150 .procname = "max_desync_factor",
6151 .data = &ipv6_devconf.max_desync_factor,
6152 .maxlen = sizeof(int),
6153 .mode = 0644,
6154 .proc_handler = proc_dointvec,
6155 },
6156 {
6157 .procname = "max_addresses",
6158 .data = &ipv6_devconf.max_addresses,
6159 .maxlen = sizeof(int),
6160 .mode = 0644,
6161 .proc_handler = proc_dointvec,
6162 },
6163 {
6164 .procname = "accept_ra_defrtr",
6165 .data = &ipv6_devconf.accept_ra_defrtr,
6166 .maxlen = sizeof(int),
6167 .mode = 0644,
6168 .proc_handler = proc_dointvec,
6169 },
6170 {
6171 .procname = "accept_ra_min_hop_limit",
6172 .data = &ipv6_devconf.accept_ra_min_hop_limit,
6173 .maxlen = sizeof(int),
6174 .mode = 0644,
6175 .proc_handler = proc_dointvec,
6176 },
6177 {
6178 .procname = "accept_ra_pinfo",
6179 .data = &ipv6_devconf.accept_ra_pinfo,
6180 .maxlen = sizeof(int),
6181 .mode = 0644,
6182 .proc_handler = proc_dointvec,
6183 },
930d6ff2 6184#ifdef CONFIG_IPV6_ROUTER_PREF
5df1f77f
KK		 6185 {
6186 .procname = "accept_ra_rtr_pref",
6187 .data = &ipv6_devconf.accept_ra_rtr_pref,
6188 .maxlen = sizeof(int),
6189 .mode = 0644,
6190 .proc_handler = proc_dointvec,
6191 },
6192 {
6193 .procname = "router_probe_interval",
6194 .data = &ipv6_devconf.rtr_probe_interval,
6195 .maxlen = sizeof(int),
6196 .mode = 0644,
6197 .proc_handler = proc_dointvec_jiffies,
6198 },
fa03ef38 6199#ifdef CONFIG_IPV6_ROUTE_INFO
bbea124b
JS		 6200 {
6201 .procname = "accept_ra_rt_info_min_plen",
6202 .data = &ipv6_devconf.accept_ra_rt_info_min_plen,
6203 .maxlen = sizeof(int),
6204 .mode = 0644,
6205 .proc_handler = proc_dointvec,
6206 },
5df1f77f
KK		 6207 {
6208 .procname = "accept_ra_rt_info_max_plen",
6209 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
6210 .maxlen = sizeof(int),
6211 .mode = 0644,
6212 .proc_handler = proc_dointvec,
6213 },
09c884d4 6214#endif
930d6ff2 6215#endif
5df1f77f
KK		 6216 {
6217 .procname = "proxy_ndp",
6218 .data = &ipv6_devconf.proxy_ndp,
6219 .maxlen = sizeof(int),
6220 .mode = 0644,
6221 .proc_handler = addrconf_sysctl_proxy_ndp,
6222 },
6223 {
6224 .procname = "accept_source_route",
6225 .data = &ipv6_devconf.accept_source_route,
6226 .maxlen = sizeof(int),
6227 .mode = 0644,
6228 .proc_handler = proc_dointvec,
6229 },
95c385b4 6230#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
5df1f77f
KK		 6231 {
6232 .procname = "optimistic_dad",
6233 .data = &ipv6_devconf.optimistic_dad,
6234 .maxlen = sizeof(int),
6235 .mode = 0644,
6236 .proc_handler = proc_dointvec,
6237 },
6238 {
6239 .procname = "use_optimistic",
6240 .data = &ipv6_devconf.use_optimistic,
6241 .maxlen = sizeof(int),
6242 .mode = 0644,
6243 .proc_handler = proc_dointvec,
6244 },
7bc570c8
YH		 6245#endif
6246#ifdef CONFIG_IPV6_MROUTE
5df1f77f
KK		 6247 {
6248 .procname = "mc_forwarding",
6249 .data = &ipv6_devconf.mc_forwarding,
6250 .maxlen = sizeof(int),
6251 .mode = 0444,
6252 .proc_handler = proc_dointvec,
6253 },
95c385b4 6254#endif
5df1f77f
KK		 6255 {
6256 .procname = "disable_ipv6",
6257 .data = &ipv6_devconf.disable_ipv6,
6258 .maxlen = sizeof(int),
6259 .mode = 0644,
6260 .proc_handler = addrconf_sysctl_disable,
6261 },
6262 {
6263 .procname = "accept_dad",
6264 .data = &ipv6_devconf.accept_dad,
6265 .maxlen = sizeof(int),
6266 .mode = 0644,
6267 .proc_handler = proc_dointvec,
6268 },
6269 {
6270 .procname = "force_tllao",
6271 .data = &ipv6_devconf.force_tllao,
6272 .maxlen = sizeof(int),
6273 .mode = 0644,
6274 .proc_handler = proc_dointvec
6275 },
6276 {
6277 .procname = "ndisc_notify",
6278 .data = &ipv6_devconf.ndisc_notify,
6279 .maxlen = sizeof(int),
6280 .mode = 0644,
6281 .proc_handler = proc_dointvec
6282 },
6283 {
6284 .procname = "suppress_frag_ndisc",
6285 .data = &ipv6_devconf.suppress_frag_ndisc,
6286 .maxlen = sizeof(int),
6287 .mode = 0644,
6288 .proc_handler = proc_dointvec
6289 },
6290 {
6291 .procname = "accept_ra_from_local",
6292 .data = &ipv6_devconf.accept_ra_from_local,
6293 .maxlen = sizeof(int),
6294 .mode = 0644,
6295 .proc_handler = proc_dointvec,
6296 },
6297 {
6298 .procname = "accept_ra_mtu",
6299 .data = &ipv6_devconf.accept_ra_mtu,
6300 .maxlen = sizeof(int),
6301 .mode = 0644,
6302 .proc_handler = proc_dointvec,
6303 },
6304 {
6305 .procname = "stable_secret",
6306 .data = &ipv6_devconf.stable_secret,
6307 .maxlen = IPV6_MAX_STRLEN,
6308 .mode = 0600,
6309 .proc_handler = addrconf_sysctl_stable_secret,
6310 },
6311 {
6312 .procname = "use_oif_addrs_only",
6313 .data = &ipv6_devconf.use_oif_addrs_only,
6314 .maxlen = sizeof(int),
6315 .mode = 0644,
6316 .proc_handler = proc_dointvec,
6317 },
6318 {
6319 .procname = "ignore_routes_with_linkdown",
6320 .data = &ipv6_devconf.ignore_routes_with_linkdown,
6321 .maxlen = sizeof(int),
6322 .mode = 0644,
6323 .proc_handler = addrconf_sysctl_ignore_routes_with_linkdown,
6324 },
6325 {
6326 .procname = "drop_unicast_in_l2_multicast",
6327 .data = &ipv6_devconf.drop_unicast_in_l2_multicast,
6328 .maxlen = sizeof(int),
6329 .mode = 0644,
6330 .proc_handler = proc_dointvec,
6331 },
6332 {
6333 .procname = "drop_unsolicited_na",
6334 .data = &ipv6_devconf.drop_unsolicited_na,
6335 .maxlen = sizeof(int),
6336 .mode = 0644,
6337 .proc_handler = proc_dointvec,
6338 },
6339 {
6340 .procname = "keep_addr_on_down",
6341 .data = &ipv6_devconf.keep_addr_on_down,
6342 .maxlen = sizeof(int),
6343 .mode = 0644,
6344 .proc_handler = proc_dointvec,
6345
6346 },
1ababeba
DL		 6347 {
6348 .procname = "seg6_enabled",
6349 .data = &ipv6_devconf.seg6_enabled,
6350 .maxlen = sizeof(int),
6351 .mode = 0644,
6352 .proc_handler = proc_dointvec,
6353 },
bf355b8d
DL		 6354#ifdef CONFIG_IPV6_SEG6_HMAC
6355 {
6356 .procname = "seg6_require_hmac",
6357 .data = &ipv6_devconf.seg6_require_hmac,
6358 .maxlen = sizeof(int),
6359 .mode = 0644,
6360 .proc_handler = proc_dointvec,
6361 },
6362#endif
adc176c5
EN		 6363 {
6364 .procname = "enhanced_dad",
6365 .data = &ipv6_devconf.enhanced_dad,
6366 .maxlen = sizeof(int),
6367 .mode = 0644,
6368 .proc_handler = proc_dointvec,
6369 },
d35a00b8
FJ		 6370 {
6371 .procname = "addr_gen_mode",
6372 .data = &ipv6_devconf.addr_gen_mode,
6373 .maxlen = sizeof(int),
6374 .mode = 0644,
6375 .proc_handler = addrconf_sysctl_addr_gen_mode,
6376 },
df789fe7
DF		 6377 {
6378 .procname = "disable_policy",
6379 .data = &ipv6_devconf.disable_policy,
6380 .maxlen = sizeof(int),
6381 .mode = 0644,
6382 .proc_handler = addrconf_sysctl_disable_policy,
6383 },
2210d6b2
MŻ		 6384 {
6385 .procname = "ndisc_tclass",
6386 .data = &ipv6_devconf.ndisc_tclass,
6387 .maxlen = sizeof(int),
6388 .mode = 0644,
6389 .proc_handler = proc_dointvec_minmax,
6390 .extra1 = (void *)&zero,
6391 .extra2 = (void *)&two_five_five,
6392 },
5df1f77f
KK		 6393 {
6394 /* sentinel */
6395 }
1da177e4
LT		 6396};
6397
bff16c2f 6398static int __addrconf_sysctl_register(struct net *net, char *dev_name,
f8572d8f 6399 struct inet6_dev *idev, struct ipv6_devconf *p)
1da177e4 6400{
29c994e3 6401 int i, ifindex;
607ea7cd 6402 struct ctl_table *table;
6105e293 6403 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ];
1dab6222 6404
607ea7cd
KK		 6405 table = kmemdup(addrconf_sysctl, sizeof(addrconf_sysctl), GFP_KERNEL);
6406 if (!table)
f68635e6
PE		 6407 goto out;
6408
607ea7cd
KK		 6409 for (i = 0; table[i].data; i++) {
6410 table[i].data += (char *)p - (char *)&ipv6_devconf;
cb9e684e
MŻ		 6411 /* If one of these is already set, then it is not safe to
6412 * overwrite either of them: this makes proc_dointvec_minmax
6413 * usable.
6414 */
6415 if (!table[i].extra1 && !table[i].extra2) {
6416 table[i].extra1 = idev; /* embedded; no ref */
6417 table[i].extra2 = net;
6418 }
1da177e4 6419 }
1da177e4 6420
6105e293 6421 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name);
1da177e4 6422
607ea7cd
KK		 6423 p->sysctl_header = register_net_sysctl(net, path, table);
6424 if (!p->sysctl_header)
6105e293 6425 goto free;
f68635e6 6426
29c994e3
ND		 6427 if (!strcmp(dev_name, "all"))
6428 ifindex = NETCONFA_IFINDEX_ALL;
6429 else if (!strcmp(dev_name, "default"))
6430 ifindex = NETCONFA_IFINDEX_DEFAULT;
6431 else
6432 ifindex = idev->dev->ifindex;
85b3daad
DA		 6433 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, NETCONFA_ALL,
6434 ifindex, p);
95897312 6435 return 0;
1da177e4 6436
f68635e6 6437free:
607ea7cd 6438 kfree(table);
f68635e6 6439out:
95897312 6440 return -ENOBUFS;
1da177e4
LT		 6441}
6442
23452170
DA		 6443static void __addrconf_sysctl_unregister(struct net *net,
6444 struct ipv6_devconf *p, int ifindex)
408c4768 6445{
607ea7cd 6446 struct ctl_table *table;
408c4768 6447
607ea7cd 6448 if (!p->sysctl_header)
408c4768
PE		 6449 return;
6450
607ea7cd
KK		 6451 table = p->sysctl_header->ctl_table_arg;
6452 unregister_net_sysctl_table(p->sysctl_header);
6453 p->sysctl_header = NULL;
6454 kfree(table);
23452170
DA		 6455
6456 inet6_netconf_notify_devconf(net, RTM_DELNETCONF, 0, ifindex, NULL);
408c4768
PE		 6457}
6458
a317a2f1 6459static int addrconf_sysctl_register(struct inet6_dev *idev)
f52295a9 6460{
a317a2f1
WC		 6461 int err;
6462
6463 if (!sysctl_dev_name_is_allowed(idev->dev->name))
6464 return -EINVAL;
6465
6466 err = neigh_sysctl_register(idev->dev, idev->nd_parms,
6467 &ndisc_ifinfo_sysctl_change);
6468 if (err)
6469 return err;
6470 err = __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
6471 idev, &idev->cnf);
6472 if (err)
6473 neigh_sysctl_unregister(idev->nd_parms);
6474
6475 return err;
f52295a9
PE		 6476}
6477
408c4768 6478static void addrconf_sysctl_unregister(struct inet6_dev *idev)
1da177e4 6479{
23452170
DA		 6480 __addrconf_sysctl_unregister(dev_net(idev->dev), &idev->cnf,
6481 idev->dev->ifindex);
408c4768 6482 neigh_sysctl_unregister(idev->nd_parms);
1da177e4
LT		 6483}
6484
6485
6486#endif
6487
2c8c1e72 6488static int __net_init addrconf_init_net(struct net *net)
e0da5a48 6489{
a79ca223 6490 int err = -ENOMEM;
e0da5a48
PE		 6491 struct ipv6_devconf *all, *dflt;
6492
a79ca223 6493 all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL);
63159f29 6494 if (!all)
a79ca223 6495 goto err_alloc_all;
e0da5a48 6496
a79ca223 6497 dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
63159f29 6498 if (!dflt)
a79ca223 6499 goto err_alloc_dflt;
e0da5a48 6500
a79ca223
HZ		 6501 /* these will be inherited by all namespaces */
6502 dflt->autoconf = ipv6_defaults.autoconf;
6503 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
e0da5a48 6504
3d1bec99
HFS		 6505 dflt->stable_secret.initialized = false;
6506 all->stable_secret.initialized = false;
6507
e0da5a48
PE		 6508 net->ipv6.devconf_all = all;
6509 net->ipv6.devconf_dflt = dflt;
6510
6511#ifdef CONFIG_SYSCTL
f8572d8f 6512 err = __addrconf_sysctl_register(net, "all", NULL, all);
e0da5a48
PE		 6513 if (err < 0)
6514 goto err_reg_all;
6515
f8572d8f 6516 err = __addrconf_sysctl_register(net, "default", NULL, dflt);
e0da5a48
PE		 6517 if (err < 0)
6518 goto err_reg_dflt;
6519#endif
6520 return 0;
6521
6522#ifdef CONFIG_SYSCTL
6523err_reg_dflt:
23452170 6524 __addrconf_sysctl_unregister(net, all, NETCONFA_IFINDEX_ALL);
e0da5a48
PE		 6525err_reg_all:
6526 kfree(dflt);
6527#endif
6528err_alloc_dflt:
6529 kfree(all);
6530err_alloc_all:
6531 return err;
6532}
6533
2c8c1e72 6534static void __net_exit addrconf_exit_net(struct net *net)
e0da5a48
PE		 6535{
6536#ifdef CONFIG_SYSCTL
23452170
DA		 6537 __addrconf_sysctl_unregister(net, net->ipv6.devconf_dflt,
6538 NETCONFA_IFINDEX_DEFAULT);
6539 __addrconf_sysctl_unregister(net, net->ipv6.devconf_all,
6540 NETCONFA_IFINDEX_ALL);
e0da5a48 6541#endif
73cf0e92 6542 kfree(net->ipv6.devconf_dflt);
6543 kfree(net->ipv6.devconf_all);
e0da5a48
PE		 6544}
6545
6546static struct pernet_operations addrconf_ops = {
6547 .init = addrconf_init_net,
6548 .exit = addrconf_exit_net,
6549};
6550
207895fd 6551static struct rtnl_af_ops inet6_ops __read_mostly = {
b382b191
TG		 6552 .family = AF_INET6,
6553 .fill_link_af = inet6_fill_link_af,
6554 .get_link_af_size = inet6_get_link_af_size,
11b1f828 6555 .validate_link_af = inet6_validate_link_af,
f53adae4 6556 .set_link_af = inet6_set_link_af,
b382b191
TG		 6557};
6558
1da177e4
LT		 6559/*
6560 * Init / cleanup code
6561 */
6562
6563int __init addrconf_init(void)
6564{
a317a2f1 6565 struct inet6_dev *idev;
c2e21293 6566 int i, err;
2a8cc6c8 6567
e21e8467
SH		 6568 err = ipv6_addr_label_init();
6569 if (err < 0) {
f3213831
JP		 6570 pr_crit("%s: cannot initialize default policy table: %d\n",
6571 __func__, err);
2cc6d2bf 6572 goto out;
2a8cc6c8 6573 }
1da177e4 6574
2cc6d2bf
NH		 6575 err = register_pernet_subsys(&addrconf_ops);
6576 if (err < 0)
6577 goto out_addrlabel;
e0da5a48 6578
c15b1cca
HFS		 6579 addrconf_wq = create_workqueue("ipv6_addrconf");
6580 if (!addrconf_wq) {
6581 err = -ENOMEM;
6582 goto out_nowq;
6583 }
6584
1da177e4
LT		 6585 /* The addrconf netdev notifier requires that loopback_dev
6586 * has it's ipv6 private information allocated and setup
6587 * before it can bring up and give link-local addresses
6588 * to other devices which are up.
6589 *
6590 * Unfortunately, loopback_dev is not necessarily the first
6591 * entry in the global dev_base list of net devices. In fact,
6592 * it is likely to be the very last entry on that list.
6593 * So this causes the notifier registry below to try and
6594 * give link-local addresses to all devices besides loopback_dev
6595 * first, then loopback_dev, which cases all the non-loopback_dev
6596 * devices to fail to get a link-local address.
6597 *
6598 * So, as a temporary fix, allocate the ipv6 structure for
6599 * loopback_dev first by hand.
6600 * Longer term, all of the dependencies ipv6 has upon the loopback
6601 * device and it being up should be removed.
6602 */
6603 rtnl_lock();
a317a2f1 6604 idev = ipv6_add_dev(init_net.loopback_dev);
1da177e4 6605 rtnl_unlock();
a317a2f1
WC		 6606 if (IS_ERR(idev)) {
6607 err = PTR_ERR(idev);
e0da5a48 6608 goto errlo;
a317a2f1 6609 }
1da177e4 6610
2f460933
WC		 6611 ip6_route_init_special_entries();
6612
c2e21293 6613 for (i = 0; i < IN6_ADDR_HSIZE; i++)
6614 INIT_HLIST_HEAD(&inet6_addr_lst[i]);
6615
1da177e4
LT		 6616 register_netdevice_notifier(&ipv6_dev_notf);
6617
c15b1cca 6618 addrconf_verify();
c127ea2c 6619
3678a9d8 6620 rtnl_af_register(&inet6_ops);
b382b191 6621
c7ac8679 6622 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo,
b97bac64 6623 0);
c127ea2c
TG		 6624 if (err < 0)
6625 goto errout;
6626
6627 /* Only the first call to __rtnl_register can fail */
b97bac64
FW		 6628 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL, 0);
6629 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL, 0);
c7ac8679 6630 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr,
c24675f8 6631 inet6_dump_ifaddr, RTNL_FLAG_DOIT_UNLOCKED);
c7ac8679 6632 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL,
b97bac64 6633 inet6_dump_ifmcaddr, 0);
c7ac8679 6634 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL,
b97bac64 6635 inet6_dump_ifacaddr, 0);
76f8f6cb 6636 __rtnl_register(PF_INET6, RTM_GETNETCONF, inet6_netconf_get_devconf,
4ea2607f 6637 inet6_netconf_dump_devconf, RTNL_FLAG_DOIT_UNLOCKED);
c127ea2c 6638
2a8cc6c8
YH		 6639 ipv6_addr_label_rtnl_register();
6640
1da177e4 6641 return 0;
c127ea2c 6642errout:
b382b191 6643 rtnl_af_unregister(&inet6_ops);
c127ea2c 6644 unregister_netdevice_notifier(&ipv6_dev_notf);
e0da5a48 6645errlo:
c15b1cca
HFS		 6646 destroy_workqueue(addrconf_wq);
6647out_nowq:
e0da5a48 6648 unregister_pernet_subsys(&addrconf_ops);
2cc6d2bf
NH		 6649out_addrlabel:
6650 ipv6_addr_label_cleanup();
6651out:
c127ea2c 6652 return err;
1da177e4
LT		 6653}
6654
09f7709f 6655void addrconf_cleanup(void)
1da177e4 6656{
176c39af 6657 struct net_device *dev;
1da177e4
LT		 6658 int i;
6659
6660 unregister_netdevice_notifier(&ipv6_dev_notf);
e0da5a48 6661 unregister_pernet_subsys(&addrconf_ops);
2cc6d2bf 6662 ipv6_addr_label_cleanup();
1da177e4 6663
5c45121d 6664 rtnl_af_unregister(&inet6_ops);
1da177e4 6665
5c45121d 6666 rtnl_lock();
b382b191 6667
176c39af
DL		 6668 /* clean dev list */
6669 for_each_netdev(&init_net, dev) {
6670 if (__in6_dev_get(dev) == NULL)
6671 continue;
6672 addrconf_ifdown(dev, 1);
6673 }
6674 addrconf_ifdown(init_net.loopback_dev, 2);
6675
1da177e4
LT		 6676 /*
6677 * Check hash table.
6678 */
5c578aed 6679 spin_lock_bh(&addrconf_hash_lock);
c2e21293 6680 for (i = 0; i < IN6_ADDR_HSIZE; i++)
6681 WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
5c578aed 6682 spin_unlock_bh(&addrconf_hash_lock);
c15b1cca 6683 cancel_delayed_work(&addr_chk_work);
1da177e4 6684 rtnl_unlock();
c15b1cca
HFS		 6685
6686 destroy_workqueue(addrconf_wq);
1da177e4 6687}
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