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net/ipv6: Change address check to always take a device argument
[linux-block.git] / net / ipv6 / addrconf.c
CommitLineData
1da177e4
LT		 1/*
2 * IPv6 Address [auto]configuration
3 * Linux INET6 implementation
4 *
5 * Authors:
1ab1457c 6 * Pedro Roque <roque@di.fc.ul.pt>
1da177e4
LT		 7 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
8 *
1da177e4
LT		 9 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License
11 * as published by the Free Software Foundation; either version
12 * 2 of the License, or (at your option) any later version.
13 */
14
15/*
16 * Changes:
17 *
18 * Janos Farkas : delete timer on ifdown
19 * <chexum@bankinf.banki.hu>
20 * Andi Kleen : kill double kfree on module
21 * unload.
22 * Maciej W. Rozycki : FDDI support
23 * sekiya@USAGI : Don't send too many RS
24 * packets.
25 * yoshfuji@USAGI : Fixed interval between DAD
26 * packets.
27 * YOSHIFUJI Hideaki @USAGI : improved accuracy of
28 * address validation timer.
29 * YOSHIFUJI Hideaki @USAGI : Privacy Extensions (RFC3041)
30 * support.
31 * Yuji SEKIYA @USAGI : Don't assign a same IPv6
32 * address on a same interface.
33 * YOSHIFUJI Hideaki @USAGI : ARCnet support
34 * YOSHIFUJI Hideaki @USAGI : convert /proc/net/if_inet6 to
35 * seq_file.
b1cacb68
YH		 36 * YOSHIFUJI Hideaki @USAGI : improved source address
37 * selection; consider scope,
38 * status etc.
1da177e4
LT		 39 */
40
f3213831
JP		 41#define pr_fmt(fmt) "IPv6: " fmt
42
1da177e4
LT		 43#include <linux/errno.h>
44#include <linux/types.h>
a0bffffc 45#include <linux/kernel.h>
174cd4b1 46#include <linux/sched/signal.h>
1da177e4
LT		 47#include <linux/socket.h>
48#include <linux/sockios.h>
1da177e4 49#include <linux/net.h>
3d1bec99 50#include <linux/inet.h>
1da177e4
LT		 51#include <linux/in6.h>
52#include <linux/netdevice.h>
1823730f 53#include <linux/if_addr.h>
1da177e4
LT		 54#include <linux/if_arp.h>
55#include <linux/if_arcnet.h>
56#include <linux/if_infiniband.h>
57#include <linux/route.h>
58#include <linux/inetdevice.h>
59#include <linux/init.h>
5a0e3ad6 60#include <linux/slab.h>
1da177e4
LT		 61#ifdef CONFIG_SYSCTL
62#include <linux/sysctl.h>
63#endif
4fc268d2 64#include <linux/capability.h>
1da177e4
LT		 65#include <linux/delay.h>
66#include <linux/notifier.h>
543537bd 67#include <linux/string.h>
ddbe5032 68#include <linux/hash.h>
1da177e4 69
457c4cbc 70#include <net/net_namespace.h>
1da177e4
LT		 71#include <net/sock.h>
72#include <net/snmp.h>
73
5241c2d7 74#include <net/6lowpan.h>
cb6bf355 75#include <net/firewire.h>
1da177e4
LT		 76#include <net/ipv6.h>
77#include <net/protocol.h>
78#include <net/ndisc.h>
79#include <net/ip6_route.h>
80#include <net/addrconf.h>
81#include <net/tcp.h>
82#include <net/ip.h>
5d620266 83#include <net/netlink.h>
f24e3d65 84#include <net/pkt_sched.h>
ca254490 85#include <net/l3mdev.h>
1da177e4
LT		 86#include <linux/if_tunnel.h>
87#include <linux/rtnetlink.h>
f3a1bfb1 88#include <linux/netconf.h>
1da177e4 89#include <linux/random.h>
e21e8467 90#include <linux/uaccess.h>
7f7d9a6b 91#include <asm/unaligned.h>
1da177e4
LT		 92
93#include <linux/proc_fs.h>
94#include <linux/seq_file.h>
bc3b2d7f 95#include <linux/export.h>
1da177e4
LT		 96
97/* Set to 3 to get tracing... */
98#define ACONF_DEBUG 2
99
100#if ACONF_DEBUG >= 3
ba3542e1 101#define ADBG(fmt, ...) printk(fmt, ##__VA_ARGS__)
1da177e4 102#else
ba3542e1 103#define ADBG(fmt, ...) do { if (0) printk(fmt, ##__VA_ARGS__); } while (0)
1da177e4
LT		 104#endif
105
106#define INFINITY_LIFE_TIME 0xFFFFFFFF
18a31e1e 107
3d1bec99
HFS		 108#define IPV6_MAX_STRLEN \
109 sizeof("ffff:ffff:ffff:ffff:ffff:ffff:255.255.255.255")
110
18a31e1e
TG		 111static inline u32 cstamp_delta(unsigned long cstamp)
112{
113 return (cstamp - INITIAL_JIFFIES) * 100UL / HZ;
114}
1da177e4 115
bd11f074
MŻ		 116static inline s32 rfc3315_s14_backoff_init(s32 irt)
117{
118 /* multiply 'initial retransmission time' by 0.9 .. 1.1 */
119 u64 tmp = (900000 + prandom_u32() % 200001) * (u64)irt;
120 do_div(tmp, 1000000);
121 return (s32)tmp;
122}
123
124static inline s32 rfc3315_s14_backoff_update(s32 rt, s32 mrt)
125{
126 /* multiply 'retransmission timeout' by 1.9 .. 2.1 */
127 u64 tmp = (1900000 + prandom_u32() % 200001) * (u64)rt;
128 do_div(tmp, 1000000);
129 if ((s32)tmp > mrt) {
130 /* multiply 'maximum retransmission time' by 0.9 .. 1.1 */
131 tmp = (900000 + prandom_u32() % 200001) * (u64)mrt;
132 do_div(tmp, 1000000);
133 }
134 return (s32)tmp;
135}
136
1da177e4 137#ifdef CONFIG_SYSCTL
a317a2f1 138static int addrconf_sysctl_register(struct inet6_dev *idev);
408c4768
PE		 139static void addrconf_sysctl_unregister(struct inet6_dev *idev);
140#else
a317a2f1 141static inline int addrconf_sysctl_register(struct inet6_dev *idev)
408c4768 142{
a317a2f1 143 return 0;
408c4768
PE		 144}
145
146static inline void addrconf_sysctl_unregister(struct inet6_dev *idev)
147{
148}
1da177e4
LT		 149#endif
150
9d6280da
JB		 151static void ipv6_regen_rndid(struct inet6_dev *idev);
152static void ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
1da177e4 153
1b34be74 154static int ipv6_generate_eui64(u8 *eui, struct net_device *dev);
d9bf82c2 155static int ipv6_count_addresses(const struct inet6_dev *idev);
622c81d5
HFS		 156static int ipv6_generate_stable_address(struct in6_addr *addr,
157 u8 dad_count,
158 const struct inet6_dev *idev);
1da177e4 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);
c76fe2d9
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
f1c02cfb
SD		 1462static bool ipv6_allow_optimistic_dad(struct net *net,
1463 struct inet6_dev *idev)
1464{
1465#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1466 if (!idev)
1467 return false;
1468 if (!net->ipv6.devconf_all->optimistic_dad && !idev->cnf.optimistic_dad)
1469 return false;
1470
1471 return true;
1472#else
1473 return false;
1474#endif
1475}
1476
3de23255
BT		 1477static int ipv6_get_saddr_eval(struct net *net,
1478 struct ipv6_saddr_score *score,
a9b05723
YH		 1479 struct ipv6_saddr_dst *dst,
1480 int i)
1481{
1482 int ret;
1483
1484 if (i <= score->rule) {
1485 switch (i) {
1486 case IPV6_SADDR_RULE_SCOPE:
1487 ret = score->scopedist;
1488 break;
1489 case IPV6_SADDR_RULE_PREFIX:
1490 ret = score->matchlen;
1491 break;
1492 default:
1493 ret = !!test_bit(i, score->scorebits);
1494 }
1495 goto out;
1496 }
1497
1498 switch (i) {
1499 case IPV6_SADDR_RULE_INIT:
1500 /* Rule 0: remember if hiscore is not ready yet */
1501 ret = !!score->ifa;
1502 break;
1503 case IPV6_SADDR_RULE_LOCAL:
1504 /* Rule 1: Prefer same address */
1505 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1506 break;
1507 case IPV6_SADDR_RULE_SCOPE:
1508 /* Rule 2: Prefer appropriate scope
1509 *
1510 * ret
1511 * ^
1512 * -1 | d 15
1513 * ---+--+-+---> scope
1514 * |
1515 * | d is scope of the destination.
1516 * B-d | \
1517 * | \ <- smaller scope is better if
db9c7c39 1518 * B-15 | \ if scope is enough for destination.
a9b05723
YH		 1519 * | ret = B - scope (-1 <= scope >= d <= 15).
1520 * d-C-1 | /
1521 * |/ <- greater is better
1522 * -C / if scope is not enough for destination.
1523 * /| ret = scope - C (-1 <= d < scope <= 15).
1524 *
1525 * d - C - 1 < B -15 (for all -1 <= d <= 15).
1526 * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1527 * Assume B = 0 and we get C > 29.
1528 */
1529 ret = __ipv6_addr_src_scope(score->addr_type);
1530 if (ret >= dst->scope)
1531 ret = -ret;
1532 else
1533 ret -= 128; /* 30 is enough */
1534 score->scopedist = ret;
1535 break;
1536 case IPV6_SADDR_RULE_PREFERRED:
7fd2561e 1537 {
a9b05723 1538 /* Rule 3: Avoid deprecated and optimistic addresses */
7fd2561e
EK		 1539 u8 avoid = IFA_F_DEPRECATED;
1540
35e015e1 1541 if (!ipv6_use_optimistic_addr(net, score->ifa->idev))
7fd2561e 1542 avoid |= IFA_F_OPTIMISTIC;
a9b05723 1543 ret = ipv6_saddr_preferred(score->addr_type) ||
7fd2561e 1544 !(score->ifa->flags & avoid);
a9b05723 1545 break;
7fd2561e 1546 }
a9b05723
YH		 1547#ifdef CONFIG_IPV6_MIP6
1548 case IPV6_SADDR_RULE_HOA:
7cbca67c 1549 {
a9b05723 1550 /* Rule 4: Prefer home address */
7cbca67c
YH		 1551 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1552 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
a9b05723 1553 break;
7cbca67c 1554 }
a9b05723
YH		 1555#endif
1556 case IPV6_SADDR_RULE_OIF:
1557 /* Rule 5: Prefer outgoing interface */
1558 ret = (!dst->ifindex ||
1559 dst->ifindex == score->ifa->idev->dev->ifindex);
1560 break;
1561 case IPV6_SADDR_RULE_LABEL:
1562 /* Rule 6: Prefer matching label */
3de23255
BT		 1563 ret = ipv6_addr_label(net,
1564 &score->ifa->addr, score->addr_type,
a9b05723
YH		 1565 score->ifa->idev->dev->ifindex) == dst->label;
1566 break;
a9b05723 1567 case IPV6_SADDR_RULE_PRIVACY:
7cbca67c 1568 {
a9b05723 1569 /* Rule 7: Prefer public address
25985edc 1570 * Note: prefer temporary address if use_tempaddr >= 2
a9b05723 1571 */
7cbca67c
YH		 1572 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1573 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1574 score->ifa->idev->cnf.use_tempaddr >= 2;
1575 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
a9b05723 1576 break;
7cbca67c 1577 }
a9b05723
YH		 1578 case IPV6_SADDR_RULE_ORCHID:
1579 /* Rule 8-: Prefer ORCHID vs ORCHID or
1580 * non-ORCHID vs non-ORCHID
1581 */
1582 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1583 ipv6_addr_orchid(dst->addr));
1584 break;
1585 case IPV6_SADDR_RULE_PREFIX:
1586 /* Rule 8: Use longest matching prefix */
91b4b04f
YH		 1587 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr);
1588 if (ret > score->ifa->prefix_len)
1589 ret = score->ifa->prefix_len;
1590 score->matchlen = ret;
a9b05723 1591 break;
7fd2561e
EK		 1592#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1593 case IPV6_SADDR_RULE_NOT_OPTIMISTIC:
1594 /* Optimistic addresses still have lower precedence than other
1595 * preferred addresses.
1596 */
1597 ret = !(score->ifa->flags & IFA_F_OPTIMISTIC);
1598 break;
1599#endif
a9b05723
YH		 1600 default:
1601 ret = 0;
1602 }
1603
1604 if (ret)
1605 __set_bit(i, score->scorebits);
1606 score->rule = i;
1607out:
1608 return ret;
1609}
1610
c0b8da1e
YH		 1611static int __ipv6_dev_get_saddr(struct net *net,
1612 struct ipv6_saddr_dst *dst,
c0b8da1e
YH		 1613 struct inet6_dev *idev,
1614 struct ipv6_saddr_score *scores,
1615 int hiscore_idx)
9131f3de 1616{
c0b8da1e 1617 struct ipv6_saddr_score *score = &scores[1 - hiscore_idx], *hiscore = &scores[hiscore_idx];
9131f3de 1618
f59c031e 1619 list_for_each_entry_rcu(score->ifa, &idev->addr_list, if_list) {
9131f3de
YH		 1620 int i;
1621
1622 /*
1623 * - Tentative Address (RFC2462 section 5.4)
1624 * - A tentative address is not considered
1625 * "assigned to an interface" in the traditional
1626 * sense, unless it is also flagged as optimistic.
1627 * - Candidate Source Address (section 4)
1628 * - In any case, anycast addresses, multicast
1629 * addresses, and the unspecified address MUST
1630 * NOT be included in a candidate set.
1631 */
1632 if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1633 (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
1634 continue;
1635
1636 score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1637
1638 if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1639 score->addr_type & IPV6_ADDR_MULTICAST)) {
1640 net_dbg_ratelimited("ADDRCONF: unspecified / multicast address assigned as unicast address on %s",
1641 idev->dev->name);
1642 continue;
1643 }
1644
1645 score->rule = -1;
1646 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1647
1648 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1649 int minihiscore, miniscore;
1650
1651 minihiscore = ipv6_get_saddr_eval(net, hiscore, dst, i);
1652 miniscore = ipv6_get_saddr_eval(net, score, dst, i);
1653
1654 if (minihiscore > miniscore) {
1655 if (i == IPV6_SADDR_RULE_SCOPE &&
1656 score->scopedist > 0) {
1657 /*
1658 * special case:
1659 * each remaining entry
1660 * has too small (not enough)
1661 * scope, because ifa entries
1662 * are sorted by their scope
1663 * values.
1664 */
1665 goto out;
1666 }
1667 break;
1668 } else if (minihiscore < miniscore) {
9131f3de 1669 swap(hiscore, score);
c0b8da1e 1670 hiscore_idx = 1 - hiscore_idx;
9131f3de
YH		 1671
1672 /* restore our iterator */
1673 score->ifa = hiscore->ifa;
1674
1675 break;
1676 }
1677 }
1678 }
1679out:
c0b8da1e 1680 return hiscore_idx;
9131f3de
YH		 1681}
1682
afbac601
DA		 1683static int ipv6_get_saddr_master(struct net *net,
1684 const struct net_device *dst_dev,
1685 const struct net_device *master,
1686 struct ipv6_saddr_dst *dst,
1687 struct ipv6_saddr_score *scores,
1688 int hiscore_idx)
1689{
1690 struct inet6_dev *idev;
1691
1692 idev = __in6_dev_get(dst_dev);
1693 if (idev)
1694 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev,
1695 scores, hiscore_idx);
1696
1697 idev = __in6_dev_get(master);
1698 if (idev)
1699 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev,
1700 scores, hiscore_idx);
1701
1702 return hiscore_idx;
1703}
1704
b3f644fc 1705int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev,
9acd9f3a 1706 const struct in6_addr *daddr, unsigned int prefs,
7cbca67c 1707 struct in6_addr *saddr)
1da177e4 1708{
c0b8da1e 1709 struct ipv6_saddr_score scores[2], *hiscore;
a9b05723 1710 struct ipv6_saddr_dst dst;
9131f3de 1711 struct inet6_dev *idev;
072047e4 1712 struct net_device *dev;
a9b05723 1713 int dst_type;
9131f3de 1714 bool use_oif_addr = false;
c0b8da1e 1715 int hiscore_idx = 0;
cc429c8f 1716 int ret = 0;
1da177e4 1717
a9b05723
YH		 1718 dst_type = __ipv6_addr_type(daddr);
1719 dst.addr = daddr;
1720 dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1721 dst.scope = __ipv6_addr_src_scope(dst_type);
3de23255 1722 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
7cbca67c 1723 dst.prefs = prefs;
a9b05723 1724
c0b8da1e
YH		 1725 scores[hiscore_idx].rule = -1;
1726 scores[hiscore_idx].ifa = NULL;
1da177e4 1727
8814c4b5 1728 rcu_read_lock();
1da177e4 1729
9131f3de
YH		 1730 /* Candidate Source Address (section 4)
1731 * - multicast and link-local destination address,
1732 * the set of candidate source address MUST only
1733 * include addresses assigned to interfaces
1734 * belonging to the same link as the outgoing
1735 * interface.
1736 * (- For site-local destination addresses, the
1737 * set of candidate source addresses MUST only
1738 * include addresses assigned to interfaces
1739 * belonging to the same site as the outgoing
1740 * interface.)
3985e8a3
EK		 1741 * - "It is RECOMMENDED that the candidate source addresses
1742 * be the set of unicast addresses assigned to the
1743 * interface that will be used to send to the destination
1744 * (the 'outgoing' interface)." (RFC 6724)
9131f3de
YH		 1745 */
1746 if (dst_dev) {
3985e8a3 1747 idev = __in6_dev_get(dst_dev);
9131f3de 1748 if ((dst_type & IPV6_ADDR_MULTICAST) ||
3985e8a3
EK		 1749 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL ||
1750 (idev && idev->cnf.use_oif_addrs_only)) {
9131f3de
YH		 1751 use_oif_addr = true;
1752 }
1753 }
a9b05723 1754
9131f3de 1755 if (use_oif_addr) {
c0b8da1e 1756 if (idev)
c15df306 1757 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx);
9131f3de 1758 } else {
afbac601
DA		 1759 const struct net_device *master;
1760 int master_idx = 0;
1761
1762 /* if dst_dev exists and is enslaved to an L3 device, then
1763 * prefer addresses from dst_dev and then the master over
1764 * any other enslaved devices in the L3 domain.
1765 */
1766 master = l3mdev_master_dev_rcu(dst_dev);
1767 if (master) {
1768 master_idx = master->ifindex;
1769
1770 hiscore_idx = ipv6_get_saddr_master(net, dst_dev,
1771 master, &dst,
1772 scores, hiscore_idx);
1773
1774 if (scores[hiscore_idx].ifa)
1775 goto out;
1776 }
1777
9131f3de 1778 for_each_netdev_rcu(net, dev) {
afbac601
DA		 1779 /* only consider addresses on devices in the
1780 * same L3 domain
1781 */
1782 if (l3mdev_master_ifindex_rcu(dev) != master_idx)
1783 continue;
9131f3de
YH		 1784 idev = __in6_dev_get(dev);
1785 if (!idev)
072047e4 1786 continue;
c15df306 1787 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx);
1da177e4
LT		 1788 }
1789 }
afbac601
DA		 1790
1791out:
c0b8da1e 1792 hiscore = &scores[hiscore_idx];
a9b05723 1793 if (!hiscore->ifa)
cc429c8f
ED		 1794 ret = -EADDRNOTAVAIL;
1795 else
1796 *saddr = hiscore->ifa->addr;
1ab1457c 1797
cc429c8f
ED		 1798 rcu_read_unlock();
1799 return ret;
1da177e4 1800}
5e5f3f0f 1801EXPORT_SYMBOL(ipv6_dev_get_saddr);
1da177e4 1802
8965779d 1803int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr,
479840ff 1804 u32 banned_flags)
b7b1bfce
HFS		 1805{
1806 struct inet6_ifaddr *ifp;
1807 int err = -EADDRNOTAVAIL;
1808
602582ca
HFS		 1809 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
1810 if (ifp->scope > IFA_LINK)
1811 break;
b7b1bfce
HFS		 1812 if (ifp->scope == IFA_LINK &&
1813 !(ifp->flags & banned_flags)) {
1814 *addr = ifp->addr;
1815 err = 0;
1816 break;
1817 }
1818 }
1819 return err;
1820}
1821
95c385b4 1822int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
479840ff 1823 u32 banned_flags)
1da177e4
LT		 1824{
1825 struct inet6_dev *idev;
1826 int err = -EADDRNOTAVAIL;
1827
8814c4b5 1828 rcu_read_lock();
e21e8467
SH		 1829 idev = __in6_dev_get(dev);
1830 if (idev) {
1da177e4 1831 read_lock_bh(&idev->lock);
b7b1bfce 1832 err = __ipv6_get_lladdr(idev, addr, banned_flags);
1da177e4
LT		 1833 read_unlock_bh(&idev->lock);
1834 }
8814c4b5 1835 rcu_read_unlock();
1da177e4
LT		 1836 return err;
1837}
1838
d9bf82c2 1839static int ipv6_count_addresses(const struct inet6_dev *idev)
1da177e4 1840{
d9bf82c2 1841 const struct inet6_ifaddr *ifp;
1da177e4 1842 int cnt = 0;
1da177e4 1843
d9bf82c2
ED		 1844 rcu_read_lock();
1845 list_for_each_entry_rcu(ifp, &idev->addr_list, if_list)
1da177e4 1846 cnt++;
d9bf82c2 1847 rcu_read_unlock();
1da177e4
LT		 1848 return cnt;
1849}
1850
b71d1d42 1851int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
2a7851bf 1852 const struct net_device *dev, int strict)
c58da4c6 1853{
232378e8
DA		 1854 return ipv6_chk_addr_and_flags(net, addr, dev, !dev,
1855 strict, IFA_F_TENTATIVE);
c58da4c6
EK		 1856}
1857EXPORT_SYMBOL(ipv6_chk_addr);
1858
1859int ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr,
232378e8
DA		 1860 const struct net_device *dev, bool skip_dev_check,
1861 int strict, u32 banned_flags)
1da177e4 1862{
3f27fb23 1863 unsigned int hash = inet6_addr_hash(net, addr);
eedf042a 1864 struct inet6_ifaddr *ifp;
c58da4c6 1865 u32 ifp_flags;
1da177e4 1866
480318a0 1867 rcu_read_lock();
232378e8
DA		 1868
1869 if (skip_dev_check)
1870 dev = NULL;
1871
b67bfe0d 1872 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
878628fb 1873 if (!net_eq(dev_net(ifp->idev->dev), net))
bfeade08 1874 continue;
c58da4c6
EK		 1875 /* Decouple optimistic from tentative for evaluation here.
1876 * Ban optimistic addresses explicitly, when required.
1877 */
1878 ifp_flags = (ifp->flags&IFA_F_OPTIMISTIC)
1879 ? (ifp->flags&~IFA_F_TENTATIVE)
1880 : ifp->flags;
1da177e4 1881 if (ipv6_addr_equal(&ifp->addr, addr) &&
c58da4c6 1882 !(ifp_flags&banned_flags) &&
63159f29 1883 (!dev || ifp->idev->dev == dev ||
eedf042a 1884 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) {
480318a0 1885 rcu_read_unlock();
eedf042a 1886 return 1;
1da177e4
LT		 1887 }
1888 }
5c578aed 1889
480318a0 1890 rcu_read_unlock();
eedf042a 1891 return 0;
1da177e4 1892}
c58da4c6 1893EXPORT_SYMBOL(ipv6_chk_addr_and_flags);
7159039a 1894
1da177e4 1895
7df37ff3
CB		 1896/* Compares an address/prefix_len with addresses on device @dev.
1897 * If one is found it returns true.
1898 */
1899bool ipv6_chk_custom_prefix(const struct in6_addr *addr,
1900 const unsigned int prefix_len, struct net_device *dev)
1901{
47e26941
ED		 1902 const struct inet6_ifaddr *ifa;
1903 const struct inet6_dev *idev;
7df37ff3
CB		 1904 bool ret = false;
1905
1906 rcu_read_lock();
1907 idev = __in6_dev_get(dev);
1908 if (idev) {
47e26941 1909 list_for_each_entry_rcu(ifa, &idev->addr_list, if_list) {
7df37ff3
CB		 1910 ret = ipv6_prefix_equal(addr, &ifa->addr, prefix_len);
1911 if (ret)
1912 break;
1913 }
7df37ff3
CB		 1914 }
1915 rcu_read_unlock();
1916
1917 return ret;
1918}
1919EXPORT_SYMBOL(ipv6_chk_custom_prefix);
1920
b71d1d42 1921int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev)
52eeeb84 1922{
24ba333b
ED		 1923 const struct inet6_ifaddr *ifa;
1924 const struct inet6_dev *idev;
52eeeb84
YH		 1925 int onlink;
1926
1927 onlink = 0;
1928 rcu_read_lock();
1929 idev = __in6_dev_get(dev);
1930 if (idev) {
24ba333b 1931 list_for_each_entry_rcu(ifa, &idev->addr_list, if_list) {
52eeeb84
YH		 1932 onlink = ipv6_prefix_equal(addr, &ifa->addr,
1933 ifa->prefix_len);
1934 if (onlink)
1935 break;
1936 }
52eeeb84
YH		 1937 }
1938 rcu_read_unlock();
1939 return onlink;
1940}
52eeeb84
YH		 1941EXPORT_SYMBOL(ipv6_chk_prefix);
1942
9acd9f3a 1943struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1cab3da6 1944 struct net_device *dev, int strict)
1da177e4 1945{
3f27fb23 1946 unsigned int hash = inet6_addr_hash(net, addr);
b79d1d54 1947 struct inet6_ifaddr *ifp, *result = NULL;
1da177e4 1948
24f226da
ED		 1949 rcu_read_lock();
1950 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
878628fb 1951 if (!net_eq(dev_net(ifp->idev->dev), net))
1cab3da6 1952 continue;
1da177e4 1953 if (ipv6_addr_equal(&ifp->addr, addr)) {
63159f29 1954 if (!dev || ifp->idev->dev == dev ||
1da177e4 1955 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
b79d1d54 1956 result = ifp;
1da177e4
LT		 1957 in6_ifa_hold(ifp);
1958 break;
1959 }
1960 }
1961 }
24f226da 1962 rcu_read_unlock();
1da177e4 1963
b79d1d54 1964 return result;
1da177e4
LT		 1965}
1966
1da177e4
LT		 1967/* Gets referenced address, destroys ifaddr */
1968
cc411d0b 1969static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
1da177e4 1970{
3d171f39
LR		 1971 if (dad_failed)
1972 ifp->flags |= IFA_F_DADFAILED;
1973
ec8add2a 1974 if (ifp->flags&IFA_F_TEMPORARY) {
1da177e4
LT		 1975 struct inet6_ifaddr *ifpub;
1976 spin_lock_bh(&ifp->lock);
1977 ifpub = ifp->ifpub;
1978 if (ifpub) {
1979 in6_ifa_hold(ifpub);
1980 spin_unlock_bh(&ifp->lock);
fffcefe9 1981 ipv6_create_tempaddr(ifpub, ifp, true);
1da177e4
LT		 1982 in6_ifa_put(ifpub);
1983 } else {
1984 spin_unlock_bh(&ifp->lock);
1985 }
1986 ipv6_del_addr(ifp);
ec8add2a
SD		 1987 } else if (ifp->flags&IFA_F_PERMANENT || !dad_failed) {
1988 spin_lock_bh(&ifp->lock);
1989 addrconf_del_dad_work(ifp);
1990 ifp->flags |= IFA_F_TENTATIVE;
f1c02cfb
SD		 1991 if (dad_failed)
1992 ifp->flags &= ~IFA_F_OPTIMISTIC;
ec8add2a
SD		 1993 spin_unlock_bh(&ifp->lock);
1994 if (dad_failed)
1995 ipv6_ifa_notify(0, ifp);
1996 in6_ifa_put(ifp);
c15b1cca 1997 } else {
1da177e4 1998 ipv6_del_addr(ifp);
c15b1cca 1999 }
1da177e4
LT		 2000}
2001
f2344a13
HX		 2002static int addrconf_dad_end(struct inet6_ifaddr *ifp)
2003{
2004 int err = -ENOENT;
2005
8e8e676d 2006 spin_lock_bh(&ifp->lock);
f2344a13
HX		 2007 if (ifp->state == INET6_IFADDR_STATE_DAD) {
2008 ifp->state = INET6_IFADDR_STATE_POSTDAD;
2009 err = 0;
2010 }
8e8e676d 2011 spin_unlock_bh(&ifp->lock);
f2344a13
HX		 2012
2013 return err;
2014}
2015
da13c59b 2016void addrconf_dad_failure(struct sk_buff *skb, struct inet6_ifaddr *ifp)
3c21edbd 2017{
1b34be74 2018 struct inet6_dev *idev = ifp->idev;
1855b7c3 2019 struct net *net = dev_net(ifp->idev->dev);
9bdd8d40 2020
853dc2e0
UB		 2021 if (addrconf_dad_end(ifp)) {
2022 in6_ifa_put(ifp);
f2344a13 2023 return;
853dc2e0 2024 }
f2344a13 2025
da13c59b
VP		 2026 net_info_ratelimited("%s: IPv6 duplicate address %pI6c used by %pM detected!\n",
2027 ifp->idev->dev->name, &ifp->addr, eth_hdr(skb)->h_source);
9bdd8d40 2028
5f40ef77
HFS		 2029 spin_lock_bh(&ifp->lock);
2030
2031 if (ifp->flags & IFA_F_STABLE_PRIVACY) {
2032 int scope = ifp->scope;
2033 u32 flags = ifp->flags;
2034 struct in6_addr new_addr;
2035 struct inet6_ifaddr *ifp2;
2036 u32 valid_lft, preferred_lft;
2037 int pfxlen = ifp->prefix_len;
5f40ef77
HFS		 2038 int retries = ifp->stable_privacy_retry + 1;
2039
1855b7c3 2040 if (retries > net->ipv6.sysctl.idgen_retries) {
5f40ef77
HFS		 2041 net_info_ratelimited("%s: privacy stable address generation failed because of DAD conflicts!\n",
2042 ifp->idev->dev->name);
2043 goto errdad;
2044 }
2045
2046 new_addr = ifp->addr;
2047 if (ipv6_generate_stable_address(&new_addr, retries,
2048 idev))
2049 goto errdad;
2050
2051 valid_lft = ifp->valid_lft;
2052 preferred_lft = ifp->prefered_lft;
2053
2054 spin_unlock_bh(&ifp->lock);
1b34be74 2055
5f40ef77
HFS		 2056 if (idev->cnf.max_addresses &&
2057 ipv6_count_addresses(idev) >=
2058 idev->cnf.max_addresses)
2059 goto lock_errdad;
2060
2061 net_info_ratelimited("%s: generating new stable privacy address because of DAD conflict\n",
2062 ifp->idev->dev->name);
2063
2064 ifp2 = ipv6_add_addr(idev, &new_addr, NULL, pfxlen,
2065 scope, flags, valid_lft,
de95e047 2066 preferred_lft, false, NULL);
5f40ef77
HFS		 2067 if (IS_ERR(ifp2))
2068 goto lock_errdad;
2069
2070 spin_lock_bh(&ifp2->lock);
2071 ifp2->stable_privacy_retry = retries;
2072 ifp2->state = INET6_IFADDR_STATE_PREDAD;
2073 spin_unlock_bh(&ifp2->lock);
2074
1855b7c3 2075 addrconf_mod_dad_work(ifp2, net->ipv6.sysctl.idgen_delay);
5f40ef77
HFS		 2076 in6_ifa_put(ifp2);
2077lock_errdad:
2078 spin_lock_bh(&ifp->lock);
1b34be74
YH		 2079 }
2080
5f40ef77 2081errdad:
c15b1cca
HFS		 2082 /* transition from _POSTDAD to _ERRDAD */
2083 ifp->state = INET6_IFADDR_STATE_ERRDAD;
8e8e676d 2084 spin_unlock_bh(&ifp->lock);
c15b1cca
HFS		 2085
2086 addrconf_mod_dad_work(ifp, 0);
751eb6b6 2087 in6_ifa_put(ifp);
3c21edbd 2088}
1da177e4 2089
a9ed4a29
SD		 2090/* Join to solicited addr multicast group.
2091 * caller must hold RTNL */
b71d1d42 2092void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr)
1da177e4
LT		 2093{
2094 struct in6_addr maddr;
2095
2096 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
2097 return;
2098
2099 addrconf_addr_solict_mult(addr, &maddr);
2100 ipv6_dev_mc_inc(dev, &maddr);
2101}
2102
a9ed4a29 2103/* caller must hold RTNL */
b71d1d42 2104void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr)
1da177e4
LT		 2105{
2106 struct in6_addr maddr;
2107
2108 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
2109 return;
2110
2111 addrconf_addr_solict_mult(addr, &maddr);
2112 __ipv6_dev_mc_dec(idev, &maddr);
2113}
2114
a9ed4a29 2115/* caller must hold RTNL */
20380731 2116static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1da177e4
LT		 2117{
2118 struct in6_addr addr;
c15b1cca 2119
88ad3149 2120 if (ifp->prefix_len >= 127) /* RFC 6164 */
2bda8a0c 2121 return;
1da177e4
LT		 2122 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
2123 if (ipv6_addr_any(&addr))
2124 return;
013b4d90 2125 __ipv6_dev_ac_inc(ifp->idev, &addr);
1da177e4
LT		 2126}
2127
a9ed4a29 2128/* caller must hold RTNL */
20380731 2129static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1da177e4
LT		 2130{
2131 struct in6_addr addr;
c15b1cca 2132
88ad3149 2133 if (ifp->prefix_len >= 127) /* RFC 6164 */
32019e65 2134 return;
1da177e4
LT		 2135 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
2136 if (ipv6_addr_any(&addr))
2137 return;
2138 __ipv6_dev_ac_dec(ifp->idev, &addr);
2139}
2140
8a7a4b47 2141static int addrconf_ifid_6lowpan(u8 *eui, struct net_device *dev)
06a4c1c5 2142{
8a7a4b47
AA		 2143 switch (dev->addr_len) {
2144 case ETH_ALEN:
9dae2e03
LAD		 2145 memcpy(eui, dev->dev_addr, 3);
2146 eui[3] = 0xFF;
2147 eui[4] = 0xFE;
2148 memcpy(eui + 5, dev->dev_addr + 3, 3);
2149 break;
8a7a4b47
AA		 2150 case EUI64_ADDR_LEN:
2151 memcpy(eui, dev->dev_addr, EUI64_ADDR_LEN);
2152 eui[0] ^= 2;
2153 break;
2154 default:
06a4c1c5 2155 return -1;
8a7a4b47
AA		 2156 }
2157
06a4c1c5 2158 return 0;
2159}
2160
cb6bf355
YH		 2161static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev)
2162{
2163 union fwnet_hwaddr *ha;
2164
2165 if (dev->addr_len != FWNET_ALEN)
2166 return -1;
2167
2168 ha = (union fwnet_hwaddr *)dev->dev_addr;
2169
2170 memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id));
2171 eui[0] ^= 2;
2172 return 0;
2173}
2174
073a8e0e
YH		 2175static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
2176{
2177 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
2178 if (dev->addr_len != ARCNET_ALEN)
2179 return -1;
2180 memset(eui, 0, 7);
8e5e8f30 2181 eui[7] = *(u8 *)dev->dev_addr;
073a8e0e
YH		 2182 return 0;
2183}
2184
2185static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
2186{
2187 if (dev->addr_len != INFINIBAND_ALEN)
2188 return -1;
2189 memcpy(eui, dev->dev_addr + 12, 8);
2190 eui[0] |= 2;
2191 return 0;
2192}
2193
c61393ea 2194static int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
dfd982ba 2195{
9af28511
SH		 2196 if (addr == 0)
2197 return -1;
dfd982ba
YH		 2198 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
2199 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
2200 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
2201 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
2202 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
2203 ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
2204 eui[1] = 0;
2205 eui[2] = 0x5E;
2206 eui[3] = 0xFE;
2207 memcpy(eui + 4, &addr, 4);
2208 return 0;
2209}
dfd982ba
YH		 2210
2211static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
2212{
2213 if (dev->priv_flags & IFF_ISATAP)
2214 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
2215 return -1;
2216}
2217
aee80b54 2218static int addrconf_ifid_gre(u8 *eui, struct net_device *dev)
2219{
2220 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
2221}
2222
e837735e
ND		 2223static int addrconf_ifid_ip6tnl(u8 *eui, struct net_device *dev)
2224{
2225 memcpy(eui, dev->perm_addr, 3);
2226 memcpy(eui + 5, dev->perm_addr + 3, 3);
2227 eui[3] = 0xFF;
2228 eui[4] = 0xFE;
2229 eui[0] ^= 2;
2230 return 0;
2231}
2232
1da177e4
LT		 2233static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
2234{
2235 switch (dev->type) {
2236 case ARPHRD_ETHER:
2237 case ARPHRD_FDDI:
073a8e0e 2238 return addrconf_ifid_eui48(eui, dev);
1da177e4 2239 case ARPHRD_ARCNET:
073a8e0e 2240 return addrconf_ifid_arcnet(eui, dev);
1da177e4 2241 case ARPHRD_INFINIBAND:
073a8e0e 2242 return addrconf_ifid_infiniband(eui, dev);
c7dc89c0 2243 case ARPHRD_SIT:
dfd982ba 2244 return addrconf_ifid_sit(eui, dev);
aee80b54 2245 case ARPHRD_IPGRE:
45ce0fd1 2246 case ARPHRD_TUNNEL:
aee80b54 2247 return addrconf_ifid_gre(eui, dev);
e74bccb8 2248 case ARPHRD_6LOWPAN:
8a7a4b47 2249 return addrconf_ifid_6lowpan(eui, dev);
cb6bf355
YH		 2250 case ARPHRD_IEEE1394:
2251 return addrconf_ifid_ieee1394(eui, dev);
e837735e 2252 case ARPHRD_TUNNEL6:
45ce0fd1 2253 case ARPHRD_IP6GRE:
e837735e 2254 return addrconf_ifid_ip6tnl(eui, dev);
1da177e4
LT		 2255 }
2256 return -1;
2257}
2258
2259static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
2260{
2261 int err = -1;
2262 struct inet6_ifaddr *ifp;
2263
2264 read_lock_bh(&idev->lock);
602582ca
HFS		 2265 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
2266 if (ifp->scope > IFA_LINK)
2267 break;
1da177e4
LT		 2268 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
2269 memcpy(eui, ifp->addr.s6_addr+8, 8);
2270 err = 0;
2271 break;
2272 }
2273 }
2274 read_unlock_bh(&idev->lock);
2275 return err;
2276}
2277
1da177e4 2278/* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
9d6280da 2279static void ipv6_regen_rndid(struct inet6_dev *idev)
1da177e4 2280{
1da177e4 2281regen:
955189ef 2282 get_random_bytes(idev->rndid, sizeof(idev->rndid));
1da177e4 2283 idev->rndid[0] &= ~0x02;
1da177e4
LT		 2284
2285 /*
2286 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
2287 * check if generated address is not inappropriate
2288 *
2289 * - Reserved subnet anycast (RFC 2526)
2290 * 11111101 11....11 1xxxxxxx
c7dc89c0 2291 * - ISATAP (RFC4214) 6.1
1da177e4
LT		 2292 * 00-00-5E-FE-xx-xx-xx-xx
2293 * - value 0
2294 * - XXX: already assigned to an address on the device
2295 */
1ab1457c 2296 if (idev->rndid[0] == 0xfd &&
1da177e4
LT		 2297 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
2298 (idev->rndid[7]&0x80))
2299 goto regen;
2300 if ((idev->rndid[0]|idev->rndid[1]) == 0) {
2301 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
2302 goto regen;
2303 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
2304 goto regen;
2305 }
1da177e4
LT		 2306}
2307
9d6280da 2308static void ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr)
8e5e8f30 2309{
1da177e4 2310 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
9d6280da 2311 ipv6_regen_rndid(idev);
1da177e4 2312}
1da177e4
LT		 2313
2314/*
2315 * Add prefix route.
2316 */
2317
2318static void
2319addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
e431b8c0 2320 unsigned long expires, u32 flags)
1da177e4 2321{
86872cb5 2322 struct fib6_config cfg = {
ca254490 2323 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX,
86872cb5
TG		 2324 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2325 .fc_ifindex = dev->ifindex,
2326 .fc_expires = expires,
2327 .fc_dst_len = plen,
2328 .fc_flags = RTF_UP | flags,
c346dca1 2329 .fc_nlinfo.nl_net = dev_net(dev),
f410a1fb 2330 .fc_protocol = RTPROT_KERNEL,
86872cb5 2331 };
1da177e4 2332
4e3fd7a0 2333 cfg.fc_dst = *pfx;
1da177e4
LT		 2334
2335 /* Prevent useless cloning on PtP SIT.
2336 This thing is done here expecting that the whole
2337 class of non-broadcast devices need not cloning.
2338 */
07a93626 2339#if IS_ENABLED(CONFIG_IPV6_SIT)
86872cb5
TG		 2340 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
2341 cfg.fc_flags |= RTF_NONEXTHOP;
0be669bb 2342#endif
1da177e4 2343
333c4301 2344 ip6_route_add(&cfg, NULL);
1da177e4
LT		 2345}
2346
14ef37b6
AH		 2347
2348static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
2349 int plen,
2350 const struct net_device *dev,
2351 u32 flags, u32 noflags)
2352{
2353 struct fib6_node *fn;
2354 struct rt6_info *rt = NULL;
2355 struct fib6_table *table;
ca254490 2356 u32 tb_id = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX;
14ef37b6 2357
ca254490 2358 table = fib6_get_table(dev_net(dev), tb_id);
63159f29 2359 if (!table)
14ef37b6
AH		 2360 return NULL;
2361
66f5d6ce 2362 rcu_read_lock();
38fbeeee 2363 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0, true);
14ef37b6
AH		 2364 if (!fn)
2365 goto out;
1f56a01f 2366
66f5d6ce 2367 for_each_fib6_node_rt_rcu(fn) {
d1918542 2368 if (rt->dst.dev->ifindex != dev->ifindex)
14ef37b6
AH		 2369 continue;
2370 if ((rt->rt6i_flags & flags) != flags)
2371 continue;
85da53bf 2372 if ((rt->rt6i_flags & noflags) != 0)
14ef37b6 2373 continue;
d3843fe5
WW		 2374 if (!dst_hold_safe(&rt->dst))
2375 rt = NULL;
14ef37b6
AH		 2376 break;
2377 }
2378out:
66f5d6ce 2379 rcu_read_unlock();
14ef37b6
AH		 2380 return rt;
2381}
2382
2383
1da177e4
LT		 2384/* Create "default" multicast route to the interface */
2385
2386static void addrconf_add_mroute(struct net_device *dev)
2387{
86872cb5 2388 struct fib6_config cfg = {
ca254490 2389 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_LOCAL,
86872cb5
TG		 2390 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2391 .fc_ifindex = dev->ifindex,
2392 .fc_dst_len = 8,
2393 .fc_flags = RTF_UP,
c346dca1 2394 .fc_nlinfo.nl_net = dev_net(dev),
86872cb5
TG		 2395 };
2396
2397 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
2398
333c4301 2399 ip6_route_add(&cfg, NULL);
1da177e4
LT		 2400}
2401
1da177e4
LT		 2402static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
2403{
2404 struct inet6_dev *idev;
2405
2406 ASSERT_RTNL();
2407
e21e8467
SH		 2408 idev = ipv6_find_idev(dev);
2409 if (!idev)
64e724f6
BH		 2410 return ERR_PTR(-ENOBUFS);
2411
2412 if (idev->cnf.disable_ipv6)
2413 return ERR_PTR(-EACCES);
1da177e4
LT		 2414
2415 /* Add default multicast route */
ba46ee4c 2416 if (!(dev->flags & IFF_LOOPBACK) && !netif_is_l3_master(dev))
4af04aba 2417 addrconf_add_mroute(dev);
1da177e4 2418
1da177e4
LT		 2419 return idev;
2420}
2421
53bd6749
JP		 2422static void manage_tempaddrs(struct inet6_dev *idev,
2423 struct inet6_ifaddr *ifp,
2424 __u32 valid_lft, __u32 prefered_lft,
2425 bool create, unsigned long now)
2426{
2427 u32 flags;
2428 struct inet6_ifaddr *ift;
2429
2430 read_lock_bh(&idev->lock);
2431 /* update all temporary addresses in the list */
2432 list_for_each_entry(ift, &idev->tempaddr_list, tmp_list) {
2433 int age, max_valid, max_prefered;
2434
2435 if (ifp != ift->ifpub)
2436 continue;
2437
2438 /* RFC 4941 section 3.3:
2439 * If a received option will extend the lifetime of a public
2440 * address, the lifetimes of temporary addresses should
2441 * be extended, subject to the overall constraint that no
2442 * temporary addresses should ever remain "valid" or "preferred"
2443 * for a time longer than (TEMP_VALID_LIFETIME) or
2444 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), respectively.
2445 */
2446 age = (now - ift->cstamp) / HZ;
2447 max_valid = idev->cnf.temp_valid_lft - age;
2448 if (max_valid < 0)
2449 max_valid = 0;
2450
2451 max_prefered = idev->cnf.temp_prefered_lft -
76506a98 2452 idev->desync_factor - age;
53bd6749
JP		 2453 if (max_prefered < 0)
2454 max_prefered = 0;
2455
2456 if (valid_lft > max_valid)
2457 valid_lft = max_valid;
2458
2459 if (prefered_lft > max_prefered)
2460 prefered_lft = max_prefered;
2461
2462 spin_lock(&ift->lock);
2463 flags = ift->flags;
2464 ift->valid_lft = valid_lft;
2465 ift->prefered_lft = prefered_lft;
2466 ift->tstamp = now;
2467 if (prefered_lft > 0)
2468 ift->flags &= ~IFA_F_DEPRECATED;
2469
2470 spin_unlock(&ift->lock);
2471 if (!(flags&IFA_F_TENTATIVE))
2472 ipv6_ifa_notify(0, ift);
2473 }
2474
2475 if ((create || list_empty(&idev->tempaddr_list)) &&
2476 idev->cnf.use_tempaddr > 0) {
2477 /* When a new public address is created as described
2478 * in [ADDRCONF], also create a new temporary address.
2479 * Also create a temporary address if it's enabled but
2480 * no temporary address currently exists.
2481 */
2482 read_unlock_bh(&idev->lock);
fffcefe9 2483 ipv6_create_tempaddr(ifp, NULL, false);
53bd6749
JP		 2484 } else {
2485 read_unlock_bh(&idev->lock);
2486 }
2487}
2488
cc9da6cc
BM		 2489static bool is_addr_mode_generate_stable(struct inet6_dev *idev)
2490{
d35a00b8
FJ		 2491 return idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY ||
2492 idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_RANDOM;
cc9da6cc
BM		 2493}
2494
cc84b3c6
AA		 2495int addrconf_prefix_rcv_add_addr(struct net *net, struct net_device *dev,
2496 const struct prefix_info *pinfo,
2497 struct inet6_dev *in6_dev,
2498 const struct in6_addr *addr, int addr_type,
2499 u32 addr_flags, bool sllao, bool tokenized,
2500 __u32 valid_lft, u32 prefered_lft)
4f672235
AA		 2501{
2502 struct inet6_ifaddr *ifp = ipv6_get_ifaddr(net, addr, dev, 1);
2503 int create = 0, update_lft = 0;
2504
2505 if (!ifp && valid_lft) {
2506 int max_addresses = in6_dev->cnf.max_addresses;
2507
2508#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
35e015e1
MC		 2509 if ((net->ipv6.devconf_all->optimistic_dad ||
2510 in6_dev->cnf.optimistic_dad) &&
4f672235
AA		 2511 !net->ipv6.devconf_all->forwarding && sllao)
2512 addr_flags |= IFA_F_OPTIMISTIC;
2513#endif
2514
2515 /* Do not allow to create too much of autoconfigured
2516 * addresses; this would be too easy way to crash kernel.
2517 */
2518 if (!max_addresses ||
2519 ipv6_count_addresses(in6_dev) < max_addresses)
2520 ifp = ipv6_add_addr(in6_dev, addr, NULL,
2521 pinfo->prefix_len,
2522 addr_type&IPV6_ADDR_SCOPE_MASK,
2523 addr_flags, valid_lft,
de95e047 2524 prefered_lft, false, NULL);
4f672235
AA		 2525
2526 if (IS_ERR_OR_NULL(ifp))
2527 return -1;
2528
2529 update_lft = 0;
2530 create = 1;
2531 spin_lock_bh(&ifp->lock);
2532 ifp->flags |= IFA_F_MANAGETEMPADDR;
2533 ifp->cstamp = jiffies;
2534 ifp->tokenized = tokenized;
2535 spin_unlock_bh(&ifp->lock);
2536 addrconf_dad_start(ifp);
2537 }
2538
2539 if (ifp) {
2540 u32 flags;
2541 unsigned long now;
2542 u32 stored_lft;
2543
2544 /* update lifetime (RFC2462 5.5.3 e) */
2545 spin_lock_bh(&ifp->lock);
2546 now = jiffies;
2547 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
2548 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
2549 else
2550 stored_lft = 0;
2551 if (!update_lft && !create && stored_lft) {
2552 const u32 minimum_lft = min_t(u32,
2553 stored_lft, MIN_VALID_LIFETIME);
2554 valid_lft = max(valid_lft, minimum_lft);
2555
2556 /* RFC4862 Section 5.5.3e:
2557 * "Note that the preferred lifetime of the
2558 * corresponding address is always reset to
2559 * the Preferred Lifetime in the received
2560 * Prefix Information option, regardless of
2561 * whether the valid lifetime is also reset or
2562 * ignored."
2563 *
2564 * So we should always update prefered_lft here.
2565 */
2566 update_lft = 1;
2567 }
2568
2569 if (update_lft) {
2570 ifp->valid_lft = valid_lft;
2571 ifp->prefered_lft = prefered_lft;
2572 ifp->tstamp = now;
2573 flags = ifp->flags;
2574 ifp->flags &= ~IFA_F_DEPRECATED;
2575 spin_unlock_bh(&ifp->lock);
2576
2577 if (!(flags&IFA_F_TENTATIVE))
2578 ipv6_ifa_notify(0, ifp);
2579 } else
2580 spin_unlock_bh(&ifp->lock);
2581
2582 manage_tempaddrs(in6_dev, ifp, valid_lft, prefered_lft,
2583 create, now);
2584
2585 in6_ifa_put(ifp);
2586 addrconf_verify();
2587 }
2588
2589 return 0;
2590}
cc84b3c6 2591EXPORT_SYMBOL_GPL(addrconf_prefix_rcv_add_addr);
4f672235 2592
e6bff995 2593void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao)
1da177e4
LT		 2594{
2595 struct prefix_info *pinfo;
2596 __u32 valid_lft;
2597 __u32 prefered_lft;
4f672235 2598 int addr_type, err;
64236f3f 2599 u32 addr_flags = 0;
1da177e4 2600 struct inet6_dev *in6_dev;
56d417b1 2601 struct net *net = dev_net(dev);
1da177e4
LT		 2602
2603 pinfo = (struct prefix_info *) opt;
1ab1457c 2604
1da177e4 2605 if (len < sizeof(struct prefix_info)) {
ba3542e1 2606 ADBG("addrconf: prefix option too short\n");
1da177e4
LT		 2607 return;
2608 }
1ab1457c 2609
1da177e4
LT		 2610 /*
2611 * Validation checks ([ADDRCONF], page 19)
2612 */
2613
2614 addr_type = ipv6_addr_type(&pinfo->prefix);
2615
2616 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
2617 return;
2618
2619 valid_lft = ntohl(pinfo->valid);
2620 prefered_lft = ntohl(pinfo->prefered);
2621
2622 if (prefered_lft > valid_lft) {
e87cc472 2623 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n");
1da177e4
LT		 2624 return;
2625 }
2626
2627 in6_dev = in6_dev_get(dev);
2628
63159f29 2629 if (!in6_dev) {
e87cc472
JP		 2630 net_dbg_ratelimited("addrconf: device %s not configured\n",
2631 dev->name);
1da177e4
LT		 2632 return;
2633 }
2634
2635 /*
2636 * Two things going on here:
2637 * 1) Add routes for on-link prefixes
2638 * 2) Configure prefixes with the auto flag set
2639 */
2640
4bed72e4
YH		 2641 if (pinfo->onlink) {
2642 struct rt6_info *rt;
2643 unsigned long rt_expires;
2644
6f704992
YH		 2645 /* Avoid arithmetic overflow. Really, we could
2646 * save rt_expires in seconds, likely valid_lft,
2647 * but it would require division in fib gc, that it
2648 * not good.
2649 */
4bed72e4
YH		 2650 if (HZ > USER_HZ)
2651 rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
2652 else
2653 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
3dd4bc68 2654
4bed72e4
YH		 2655 if (addrconf_finite_timeout(rt_expires))
2656 rt_expires *= HZ;
1da177e4 2657
14ef37b6
AH		 2658 rt = addrconf_get_prefix_route(&pinfo->prefix,
2659 pinfo->prefix_len,
2660 dev,
2661 RTF_ADDRCONF | RTF_PREFIX_RT,
2662 RTF_GATEWAY | RTF_DEFAULT);
1da177e4 2663
14ef37b6 2664 if (rt) {
6f704992
YH		 2665 /* Autoconf prefix route */
2666 if (valid_lft == 0) {
2667 ip6_del_rt(rt);
2668 rt = NULL;
4bed72e4 2669 } else if (addrconf_finite_timeout(rt_expires)) {
6f704992 2670 /* not infinity */
1716a961 2671 rt6_set_expires(rt, jiffies + rt_expires);
6f704992 2672 } else {
1716a961 2673 rt6_clean_expires(rt);
1da177e4
LT		 2674 }
2675 } else if (valid_lft) {
6f704992 2676 clock_t expires = 0;
4bed72e4
YH		 2677 int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
2678 if (addrconf_finite_timeout(rt_expires)) {
6f704992
YH		 2679 /* not infinity */
2680 flags |= RTF_EXPIRES;
2681 expires = jiffies_to_clock_t(rt_expires);
2682 }
1da177e4 2683 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
6f704992 2684 dev, expires, flags);
1da177e4 2685 }
94e187c0 2686 ip6_rt_put(rt);
1da177e4
LT		 2687 }
2688
2689 /* Try to figure out our local address for this prefix */
2690
2691 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
1da177e4 2692 struct in6_addr addr;
f997c55c 2693 bool tokenized = false, dev_addr_generated = false;
1da177e4
LT		 2694
2695 if (pinfo->prefix_len == 64) {
2696 memcpy(&addr, &pinfo->prefix, 8);
f53adae4
DB		 2697
2698 if (!ipv6_addr_any(&in6_dev->token)) {
2699 read_lock_bh(&in6_dev->lock);
2700 memcpy(addr.s6_addr + 8,
2701 in6_dev->token.s6_addr + 8, 8);
2702 read_unlock_bh(&in6_dev->lock);
617fe29d 2703 tokenized = true;
cc9da6cc 2704 } else if (is_addr_mode_generate_stable(in6_dev) &&
622c81d5
HFS		 2705 !ipv6_generate_stable_address(&addr, 0,
2706 in6_dev)) {
64236f3f 2707 addr_flags |= IFA_F_STABLE_PRIVACY;
622c81d5 2708 goto ok;
f53adae4
DB		 2709 } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
2710 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
4f672235 2711 goto put;
f997c55c
AA		 2712 } else {
2713 dev_addr_generated = true;
1da177e4
LT		 2714 }
2715 goto ok;
2716 }
e87cc472
JP		 2717 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n",
2718 pinfo->prefix_len);
4f672235 2719 goto put;
1da177e4
LT		 2720
2721ok:
4f672235
AA		 2722 err = addrconf_prefix_rcv_add_addr(net, dev, pinfo, in6_dev,
2723 &addr, addr_type,
2724 addr_flags, sllao,
2725 tokenized, valid_lft,
2726 prefered_lft);
2727 if (err)
2728 goto put;
f997c55c
AA		 2729
2730 /* Ignore error case here because previous prefix add addr was
2731 * successful which will be notified.
2732 */
2733 ndisc_ops_prefix_rcv_add_addr(net, dev, pinfo, in6_dev, &addr,
2734 addr_type, addr_flags, sllao,
2735 tokenized, valid_lft,
2736 prefered_lft,
2737 dev_addr_generated);
1da177e4
LT		 2738 }
2739 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
4f672235 2740put:
1da177e4
LT		 2741 in6_dev_put(in6_dev);
2742}
2743
2744/*
2745 * Set destination address.
2746 * Special case for SIT interfaces where we create a new "virtual"
2747 * device.
2748 */
af284937 2749int addrconf_set_dstaddr(struct net *net, void __user *arg)
1da177e4
LT		 2750{
2751 struct in6_ifreq ireq;
2752 struct net_device *dev;
2753 int err = -EINVAL;
2754
2755 rtnl_lock();
2756
2757 err = -EFAULT;
2758 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2759 goto err_exit;
2760
af284937 2761 dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
1da177e4
LT		 2762
2763 err = -ENODEV;
63159f29 2764 if (!dev)
1da177e4
LT		 2765 goto err_exit;
2766
07a93626 2767#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4 2768 if (dev->type == ARPHRD_SIT) {
5bc3eb7e 2769 const struct net_device_ops *ops = dev->netdev_ops;
1da177e4 2770 struct ifreq ifr;
1da177e4
LT		 2771 struct ip_tunnel_parm p;
2772
2773 err = -EADDRNOTAVAIL;
2774 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2775 goto err_exit;
2776
2777 memset(&p, 0, sizeof(p));
2778 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2779 p.iph.saddr = 0;
2780 p.iph.version = 4;
2781 p.iph.ihl = 5;
2782 p.iph.protocol = IPPROTO_IPV6;
2783 p.iph.ttl = 64;
d20b3109 2784 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
1da177e4 2785
5bc3eb7e
SH		 2786 if (ops->ndo_do_ioctl) {
2787 mm_segment_t oldfs = get_fs();
2788
2789 set_fs(KERNEL_DS);
2790 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2791 set_fs(oldfs);
2792 } else
2793 err = -EOPNOTSUPP;
1da177e4
LT		 2794
2795 if (err == 0) {
2796 err = -ENOBUFS;
af284937
DL		 2797 dev = __dev_get_by_name(net, p.name);
2798 if (!dev)
1da177e4
LT		 2799 goto err_exit;
2800 err = dev_open(dev);
2801 }
2802 }
0be669bb 2803#endif
1da177e4
LT		 2804
2805err_exit:
2806 rtnl_unlock();
2807 return err;
2808}
2809
93a714d6
MC		 2810static int ipv6_mc_config(struct sock *sk, bool join,
2811 const struct in6_addr *addr, int ifindex)
2812{
2813 int ret;
2814
2815 ASSERT_RTNL();
2816
2817 lock_sock(sk);
2818 if (join)
54ff9ef3 2819 ret = ipv6_sock_mc_join(sk, ifindex, addr);
93a714d6 2820 else
54ff9ef3 2821 ret = ipv6_sock_mc_drop(sk, ifindex, addr);
93a714d6
MC		 2822 release_sock(sk);
2823
2824 return ret;
2825}
2826
1da177e4
LT		 2827/*
2828 * Manual configuration of address on an interface
2829 */
479840ff
JP		 2830static int inet6_addr_add(struct net *net, int ifindex,
2831 const struct in6_addr *pfx,
caeaba79 2832 const struct in6_addr *peer_pfx,
479840ff 2833 unsigned int plen, __u32 ifa_flags,
de95e047
DA		 2834 __u32 prefered_lft, __u32 valid_lft,
2835 struct netlink_ext_ack *extack)
1da177e4
LT		 2836{
2837 struct inet6_ifaddr *ifp;
2838 struct inet6_dev *idev;
2839 struct net_device *dev;
93a714d6
MC		 2840 unsigned long timeout;
2841 clock_t expires;
1da177e4 2842 int scope;
6f704992 2843 u32 flags;
1da177e4
LT		 2844
2845 ASSERT_RTNL();
1ab1457c 2846
24ef0da7
TG		 2847 if (plen > 128)
2848 return -EINVAL;
2849
0778769d
NT		 2850 /* check the lifetime */
2851 if (!valid_lft || prefered_lft > valid_lft)
2852 return -EINVAL;
2853
53bd6749
JP		 2854 if (ifa_flags & IFA_F_MANAGETEMPADDR && plen != 64)
2855 return -EINVAL;
2856
af284937
DL		 2857 dev = __dev_get_by_index(net, ifindex);
2858 if (!dev)
1da177e4 2859 return -ENODEV;
1ab1457c 2860
64e724f6
BH		 2861 idev = addrconf_add_dev(dev);
2862 if (IS_ERR(idev))
2863 return PTR_ERR(idev);
1da177e4 2864
93a714d6
MC		 2865 if (ifa_flags & IFA_F_MCAUTOJOIN) {
2866 int ret = ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2867 true, pfx, ifindex);
2868
2869 if (ret < 0)
2870 return ret;
2871 }
2872
1da177e4
LT		 2873 scope = ipv6_addr_scope(pfx);
2874
4bed72e4
YH		 2875 timeout = addrconf_timeout_fixup(valid_lft, HZ);
2876 if (addrconf_finite_timeout(timeout)) {
2877 expires = jiffies_to_clock_t(timeout * HZ);
2878 valid_lft = timeout;
6f704992 2879 flags = RTF_EXPIRES;
4bed72e4
YH		 2880 } else {
2881 expires = 0;
2882 flags = 0;
2883 ifa_flags |= IFA_F_PERMANENT;
6f704992 2884 }
0778769d 2885
4bed72e4
YH		 2886 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
2887 if (addrconf_finite_timeout(timeout)) {
2888 if (timeout == 0)
2889 ifa_flags |= IFA_F_DEPRECATED;
2890 prefered_lft = timeout;
2891 }
0778769d 2892
8a226b2c 2893 ifp = ipv6_add_addr(idev, pfx, peer_pfx, plen, scope, ifa_flags,
de95e047 2894 valid_lft, prefered_lft, true, extack);
0778769d 2895
1da177e4 2896 if (!IS_ERR(ifp)) {
761aac73
TH		 2897 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) {
2898 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
2899 expires, flags);
2900 }
2901
95c385b4
NH		 2902 /*
2903 * Note that section 3.1 of RFC 4429 indicates
2904 * that the Optimistic flag should not be set for
2905 * manually configured addresses
2906 */
cf22f9a2 2907 addrconf_dad_start(ifp);
53bd6749
JP		 2908 if (ifa_flags & IFA_F_MANAGETEMPADDR)
2909 manage_tempaddrs(idev, ifp, valid_lft, prefered_lft,
2910 true, jiffies);
1da177e4 2911 in6_ifa_put(ifp);
c15b1cca 2912 addrconf_verify_rtnl();
1da177e4 2913 return 0;
93a714d6
MC		 2914 } else if (ifa_flags & IFA_F_MCAUTOJOIN) {
2915 ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2916 false, pfx, ifindex);
1da177e4
LT		 2917 }
2918
2919 return PTR_ERR(ifp);
2920}
2921
6046d5b4
HK		 2922static int inet6_addr_del(struct net *net, int ifindex, u32 ifa_flags,
2923 const struct in6_addr *pfx, unsigned int plen)
1da177e4
LT		 2924{
2925 struct inet6_ifaddr *ifp;
2926 struct inet6_dev *idev;
2927 struct net_device *dev;
1ab1457c 2928
24ef0da7
TG		 2929 if (plen > 128)
2930 return -EINVAL;
2931
af284937
DL		 2932 dev = __dev_get_by_index(net, ifindex);
2933 if (!dev)
1da177e4
LT		 2934 return -ENODEV;
2935
e5d08d71 2936 idev = __in6_dev_get(dev);
63159f29 2937 if (!idev)
1da177e4
LT		 2938 return -ENXIO;
2939
2940 read_lock_bh(&idev->lock);
502a2ffd 2941 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1da177e4
LT		 2942 if (ifp->prefix_len == plen &&
2943 ipv6_addr_equal(pfx, &ifp->addr)) {
2944 in6_ifa_hold(ifp);
2945 read_unlock_bh(&idev->lock);
1ab1457c 2946
6046d5b4
HK		 2947 if (!(ifp->flags & IFA_F_TEMPORARY) &&
2948 (ifa_flags & IFA_F_MANAGETEMPADDR))
2949 manage_tempaddrs(idev, ifp, 0, 0, false,
2950 jiffies);
1da177e4 2951 ipv6_del_addr(ifp);
6046d5b4 2952 addrconf_verify_rtnl();
93a714d6
MC		 2953 if (ipv6_addr_is_multicast(pfx)) {
2954 ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2955 false, pfx, dev->ifindex);
2956 }
1da177e4
LT		 2957 return 0;
2958 }
2959 }
2960 read_unlock_bh(&idev->lock);
2961 return -EADDRNOTAVAIL;
2962}
2963
2964
af284937 2965int addrconf_add_ifaddr(struct net *net, void __user *arg)
1da177e4
LT		 2966{
2967 struct in6_ifreq ireq;
2968 int err;
1ab1457c 2969
af31f412 2970 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1da177e4 2971 return -EPERM;
1ab1457c 2972
1da177e4
LT		 2973 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2974 return -EFAULT;
2975
2976 rtnl_lock();
caeaba79 2977 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, NULL,
af284937 2978 ireq.ifr6_prefixlen, IFA_F_PERMANENT,
de95e047 2979 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME, NULL);
1da177e4
LT		 2980 rtnl_unlock();
2981 return err;
2982}
2983
af284937 2984int addrconf_del_ifaddr(struct net *net, void __user *arg)
1da177e4
LT		 2985{
2986 struct in6_ifreq ireq;
2987 int err;
1ab1457c 2988
af31f412 2989 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1da177e4
LT		 2990 return -EPERM;
2991
2992 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2993 return -EFAULT;
2994
2995 rtnl_lock();
6046d5b4 2996 err = inet6_addr_del(net, ireq.ifr6_ifindex, 0, &ireq.ifr6_addr,
af284937 2997 ireq.ifr6_prefixlen);
1da177e4
LT		 2998 rtnl_unlock();
2999 return err;
3000}
3001
b5f348e5
IJ		 3002static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
3003 int plen, int scope)
3004{
3005 struct inet6_ifaddr *ifp;
3006
8a226b2c 3007 ifp = ipv6_add_addr(idev, addr, NULL, plen,
07edd741 3008 scope, IFA_F_PERMANENT,
f3d9832e 3009 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME,
de95e047 3010 true, NULL);
b5f348e5
IJ		 3011 if (!IS_ERR(ifp)) {
3012 spin_lock_bh(&ifp->lock);
3013 ifp->flags &= ~IFA_F_TENTATIVE;
3014 spin_unlock_bh(&ifp->lock);
764d3be6 3015 rt_genid_bump_ipv6(dev_net(idev->dev));
b5f348e5
IJ		 3016 ipv6_ifa_notify(RTM_NEWADDR, ifp);
3017 in6_ifa_put(ifp);
3018 }
3019}
3020
07a93626 3021#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4
LT		 3022static void sit_add_v4_addrs(struct inet6_dev *idev)
3023{
1da177e4
LT		 3024 struct in6_addr addr;
3025 struct net_device *dev;
c346dca1 3026 struct net *net = dev_net(idev->dev);
929c9cf3 3027 int scope, plen;
f0e2acfa 3028 u32 pflags = 0;
1da177e4
LT		 3029
3030 ASSERT_RTNL();
3031
3032 memset(&addr, 0, sizeof(struct in6_addr));
3033 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
3034
3035 if (idev->dev->flags&IFF_POINTOPOINT) {
3036 addr.s6_addr32[0] = htonl(0xfe800000);
3037 scope = IFA_LINK;
929c9cf3 3038 plen = 64;
1da177e4
LT		 3039 } else {
3040 scope = IPV6_ADDR_COMPATv4;
929c9cf3 3041 plen = 96;
f0e2acfa 3042 pflags |= RTF_NONEXTHOP;
1da177e4
LT		 3043 }
3044
3045 if (addr.s6_addr32[3]) {
929c9cf3 3046 add_addr(idev, &addr, plen, scope);
f0e2acfa 3047 addrconf_prefix_route(&addr, plen, idev->dev, 0, pflags);
1da177e4
LT		 3048 return;
3049 }
3050
6fda7350 3051 for_each_netdev(net, dev) {
8e5e8f30 3052 struct in_device *in_dev = __in_dev_get_rtnl(dev);
1da177e4 3053 if (in_dev && (dev->flags & IFF_UP)) {
8e5e8f30 3054 struct in_ifaddr *ifa;
1da177e4
LT		 3055
3056 int flag = scope;
3057
3058 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
1da177e4
LT		 3059
3060 addr.s6_addr32[3] = ifa->ifa_local;
3061
3062 if (ifa->ifa_scope == RT_SCOPE_LINK)
3063 continue;
3064 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
3065 if (idev->dev->flags&IFF_POINTOPOINT)
3066 continue;
3067 flag |= IFA_HOST;
3068 }
1da177e4 3069
b5f348e5 3070 add_addr(idev, &addr, plen, flag);
f0e2acfa
ND		 3071 addrconf_prefix_route(&addr, plen, idev->dev, 0,
3072 pflags);
1da177e4
LT		 3073 }
3074 }
1ab1457c 3075 }
1da177e4 3076}
0be669bb 3077#endif
1da177e4
LT		 3078
3079static void init_loopback(struct net_device *dev)
3080{
3081 struct inet6_dev *idev;
1da177e4
LT		 3082
3083 /* ::1 */
3084
3085 ASSERT_RTNL();
3086
e5d08d71 3087 idev = ipv6_find_idev(dev);
63159f29 3088 if (!idev) {
91df42be 3089 pr_debug("%s: add_dev failed\n", __func__);
1da177e4
LT		 3090 return;
3091 }
3092
b5f348e5 3093 add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
1da177e4
LT		 3094}
3095
2ad3ed59
AA		 3096void addrconf_add_linklocal(struct inet6_dev *idev,
3097 const struct in6_addr *addr, u32 flags)
1da177e4 3098{
8e5e8f30 3099 struct inet6_ifaddr *ifp;
64236f3f 3100 u32 addr_flags = flags | IFA_F_PERMANENT;
95c385b4
NH		 3101
3102#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
35e015e1
MC		 3103 if ((dev_net(idev->dev)->ipv6.devconf_all->optimistic_dad ||
3104 idev->cnf.optimistic_dad) &&
702beb87 3105 !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
95c385b4
NH		 3106 addr_flags |= IFA_F_OPTIMISTIC;
3107#endif
1da177e4 3108
07edd741 3109 ifp = ipv6_add_addr(idev, addr, NULL, 64, IFA_LINK, addr_flags,
de95e047 3110 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME, true, NULL);
1da177e4 3111 if (!IS_ERR(ifp)) {
46d48046 3112 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
cf22f9a2 3113 addrconf_dad_start(ifp);
1da177e4
LT		 3114 in6_ifa_put(ifp);
3115 }
3116}
2ad3ed59 3117EXPORT_SYMBOL_GPL(addrconf_add_linklocal);
1da177e4 3118
622c81d5
HFS		 3119static bool ipv6_reserved_interfaceid(struct in6_addr address)
3120{
3121 if ((address.s6_addr32[2] | address.s6_addr32[3]) == 0)
3122 return true;
3123
3124 if (address.s6_addr32[2] == htonl(0x02005eff) &&
3125 ((address.s6_addr32[3] & htonl(0xfe000000)) == htonl(0xfe000000)))
3126 return true;
3127
3128 if (address.s6_addr32[2] == htonl(0xfdffffff) &&
3129 ((address.s6_addr32[3] & htonl(0xffffff80)) == htonl(0xffffff80)))
3130 return true;
3131
3132 return false;
3133}
3134
3135static int ipv6_generate_stable_address(struct in6_addr *address,
3136 u8 dad_count,
3137 const struct inet6_dev *idev)
3138{
622c81d5
HFS		 3139 static DEFINE_SPINLOCK(lock);
3140 static __u32 digest[SHA_DIGEST_WORDS];
3141 static __u32 workspace[SHA_WORKSPACE_WORDS];
3142
3143 static union {
3144 char __data[SHA_MESSAGE_BYTES];
3145 struct {
3146 struct in6_addr secret;
ff40217e 3147 __be32 prefix[2];
622c81d5
HFS		 3148 unsigned char hwaddr[MAX_ADDR_LEN];
3149 u8 dad_count;
3150 } __packed;
3151 } data;
3152
3153 struct in6_addr secret;
3154 struct in6_addr temp;
3155 struct net *net = dev_net(idev->dev);
3156
3157 BUILD_BUG_ON(sizeof(data.__data) != sizeof(data));
3158
3159 if (idev->cnf.stable_secret.initialized)
3160 secret = idev->cnf.stable_secret.secret;
3161 else if (net->ipv6.devconf_dflt->stable_secret.initialized)
3162 secret = net->ipv6.devconf_dflt->stable_secret.secret;
3163 else
3164 return -1;
3165
3166retry:
3167 spin_lock_bh(&lock);
3168
3169 sha_init(digest);
3170 memset(&data, 0, sizeof(data));
3171 memset(workspace, 0, sizeof(workspace));
3172 memcpy(data.hwaddr, idev->dev->perm_addr, idev->dev->addr_len);
ff40217e
HFS		 3173 data.prefix[0] = address->s6_addr32[0];
3174 data.prefix[1] = address->s6_addr32[1];
622c81d5
HFS		 3175 data.secret = secret;
3176 data.dad_count = dad_count;
3177
3178 sha_transform(digest, data.__data, workspace);
3179
3180 temp = *address;
ff40217e
HFS		 3181 temp.s6_addr32[2] = (__force __be32)digest[0];
3182 temp.s6_addr32[3] = (__force __be32)digest[1];
622c81d5
HFS		 3183
3184 spin_unlock_bh(&lock);
3185
3186 if (ipv6_reserved_interfaceid(temp)) {
3187 dad_count++;
1855b7c3 3188 if (dad_count > dev_net(idev->dev)->ipv6.sysctl.idgen_retries)
622c81d5
HFS		 3189 return -1;
3190 goto retry;
3191 }
3192
3193 *address = temp;
3194 return 0;
3195}
3196
cc9da6cc
BM		 3197static void ipv6_gen_mode_random_init(struct inet6_dev *idev)
3198{
3199 struct ipv6_stable_secret *s = &idev->cnf.stable_secret;
3200
3201 if (s->initialized)
3202 return;
3203 s = &idev->cnf.stable_secret;
3204 get_random_bytes(&s->secret, sizeof(s->secret));
3205 s->initialized = true;
3206}
3207
bc91b0f0
JP		 3208static void addrconf_addr_gen(struct inet6_dev *idev, bool prefix_route)
3209{
622c81d5
HFS		 3210 struct in6_addr addr;
3211
ca254490
DA		 3212 /* no link local addresses on L3 master devices */
3213 if (netif_is_l3_master(idev->dev))
3214 return;
3215
622c81d5 3216 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
bc91b0f0 3217
d35a00b8 3218 switch (idev->cnf.addr_gen_mode) {
cc9da6cc
BM		 3219 case IN6_ADDR_GEN_MODE_RANDOM:
3220 ipv6_gen_mode_random_init(idev);
3221 /* fallthrough */
3222 case IN6_ADDR_GEN_MODE_STABLE_PRIVACY:
622c81d5 3223 if (!ipv6_generate_stable_address(&addr, 0, idev))
64236f3f
HFS		 3224 addrconf_add_linklocal(idev, &addr,
3225 IFA_F_STABLE_PRIVACY);
622c81d5
HFS		 3226 else if (prefix_route)
3227 addrconf_prefix_route(&addr, 64, idev->dev, 0, 0);
cc9da6cc
BM		 3228 break;
3229 case IN6_ADDR_GEN_MODE_EUI64:
bc91b0f0
JP		 3230 /* addrconf_add_linklocal also adds a prefix_route and we
3231 * only need to care about prefix routes if ipv6_generate_eui64
3232 * couldn't generate one.
3233 */
3234 if (ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) == 0)
64236f3f 3235 addrconf_add_linklocal(idev, &addr, 0);
bc91b0f0
JP		 3236 else if (prefix_route)
3237 addrconf_prefix_route(&addr, 64, idev->dev, 0, 0);
cc9da6cc
BM		 3238 break;
3239 case IN6_ADDR_GEN_MODE_NONE:
3240 default:
3241 /* will not add any link local address */
3242 break;
bc91b0f0
JP		 3243 }
3244}
3245
1da177e4
LT		 3246static void addrconf_dev_config(struct net_device *dev)
3247{
8e5e8f30 3248 struct inet6_dev *idev;
1da177e4
LT		 3249
3250 ASSERT_RTNL();
3251
74235a25
HX		 3252 if ((dev->type != ARPHRD_ETHER) &&
3253 (dev->type != ARPHRD_FDDI) &&
74235a25 3254 (dev->type != ARPHRD_ARCNET) &&
06a4c1c5 3255 (dev->type != ARPHRD_INFINIBAND) &&
e837735e 3256 (dev->type != ARPHRD_IEEE1394) &&
e74bccb8 3257 (dev->type != ARPHRD_TUNNEL6) &&
cc9da6cc 3258 (dev->type != ARPHRD_6LOWPAN) &&
45ce0fd1
FJ		 3259 (dev->type != ARPHRD_IP6GRE) &&
3260 (dev->type != ARPHRD_IPGRE) &&
3261 (dev->type != ARPHRD_TUNNEL) &&
cc9da6cc 3262 (dev->type != ARPHRD_NONE)) {
74235a25
HX		 3263 /* Alas, we support only Ethernet autoconfiguration. */
3264 return;
3265 }
3266
1da177e4 3267 idev = addrconf_add_dev(dev);
64e724f6 3268 if (IS_ERR(idev))
1da177e4
LT		 3269 return;
3270
cc9da6cc
BM		 3271 /* this device type has no EUI support */
3272 if (dev->type == ARPHRD_NONE &&
d35a00b8
FJ		 3273 idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_EUI64)
3274 idev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_RANDOM;
cc9da6cc 3275
bc91b0f0 3276 addrconf_addr_gen(idev, false);
1da177e4
LT		 3277}
3278
07a93626 3279#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4
LT		 3280static void addrconf_sit_config(struct net_device *dev)
3281{
3282 struct inet6_dev *idev;
3283
3284 ASSERT_RTNL();
3285
1ab1457c
YH		 3286 /*
3287 * Configure the tunnel with one of our IPv4
3288 * addresses... we should configure all of
1da177e4
LT		 3289 * our v4 addrs in the tunnel
3290 */
3291
e5d08d71 3292 idev = ipv6_find_idev(dev);
63159f29 3293 if (!idev) {
91df42be 3294 pr_debug("%s: add_dev failed\n", __func__);
1da177e4
LT		 3295 return;
3296 }
3297
c7dc89c0 3298 if (dev->priv_flags & IFF_ISATAP) {
bc91b0f0 3299 addrconf_addr_gen(idev, false);
c7dc89c0
FT		 3300 return;
3301 }
3302
1da177e4
LT		 3303 sit_add_v4_addrs(idev);
3304
62b54dd9 3305 if (dev->flags&IFF_POINTOPOINT)
1da177e4 3306 addrconf_add_mroute(dev);
1da177e4 3307}
0be669bb 3308#endif
1da177e4 3309
07a93626 3310#if IS_ENABLED(CONFIG_NET_IPGRE)
aee80b54 3311static void addrconf_gre_config(struct net_device *dev)
3312{
3313 struct inet6_dev *idev;
aee80b54 3314
aee80b54 3315 ASSERT_RTNL();
3316
e5d08d71 3317 idev = ipv6_find_idev(dev);
63159f29 3318 if (!idev) {
91df42be 3319 pr_debug("%s: add_dev failed\n", __func__);
aee80b54 3320 return;
3321 }
3322
bc91b0f0 3323 addrconf_addr_gen(idev, true);
d9e4ce65
HFS		 3324 if (dev->flags & IFF_POINTOPOINT)
3325 addrconf_add_mroute(dev);
aee80b54 3326}
3327#endif
3328
f1705ec1
DA		 3329static int fixup_permanent_addr(struct inet6_dev *idev,
3330 struct inet6_ifaddr *ifp)
3331{
fc882fcf 3332 /* !rt6i_node means the host route was removed from the
8048ced9
DA		 3333 * FIB, for example, if 'lo' device is taken down. In that
3334 * case regenerate the host route.
3335 */
fc882fcf 3336 if (!ifp->rt || !ifp->rt->rt6i_node) {
8048ced9 3337 struct rt6_info *rt, *prev;
f1705ec1
DA		 3338
3339 rt = addrconf_dst_alloc(idev, &ifp->addr, false);
63a4e80b 3340 if (IS_ERR(rt))
f1705ec1
DA		 3341 return PTR_ERR(rt);
3342
8048ced9
DA		 3343 /* ifp->rt can be accessed outside of rtnl */
3344 spin_lock(&ifp->lock);
3345 prev = ifp->rt;
f1705ec1 3346 ifp->rt = rt;
8048ced9
DA		 3347 spin_unlock(&ifp->lock);
3348
3349 ip6_rt_put(prev);
f1705ec1
DA		 3350 }
3351
3352 if (!(ifp->flags & IFA_F_NOPREFIXROUTE)) {
3353 addrconf_prefix_route(&ifp->addr, ifp->prefix_len,
3354 idev->dev, 0, 0);
3355 }
3356
6d717134
DA		 3357 if (ifp->state == INET6_IFADDR_STATE_PREDAD)
3358 addrconf_dad_start(ifp);
f1705ec1
DA		 3359
3360 return 0;
3361}
3362
3363static void addrconf_permanent_addr(struct net_device *dev)
3364{
3365 struct inet6_ifaddr *ifp, *tmp;
3366 struct inet6_dev *idev;
3367
3368 idev = __in6_dev_get(dev);
3369 if (!idev)
3370 return;
3371
3372 write_lock_bh(&idev->lock);
3373
3374 list_for_each_entry_safe(ifp, tmp, &idev->addr_list, if_list) {
3375 if ((ifp->flags & IFA_F_PERMANENT) &&
3376 fixup_permanent_addr(idev, ifp) < 0) {
3377 write_unlock_bh(&idev->lock);
e669b869 3378 in6_ifa_hold(ifp);
f1705ec1
DA		 3379 ipv6_del_addr(ifp);
3380 write_lock_bh(&idev->lock);
3381
3382 net_info_ratelimited("%s: Failed to add prefix route for address %pI6c; dropping\n",
3383 idev->dev->name, &ifp->addr);
3384 }
3385 }
3386
3387 write_unlock_bh(&idev->lock);
3388}
3389
1ab1457c 3390static int addrconf_notify(struct notifier_block *this, unsigned long event,
351638e7 3391 void *ptr)
1da177e4 3392{
351638e7 3393 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
4f7f34ea 3394 struct netdev_notifier_changeupper_info *info;
748e2d93 3395 struct inet6_dev *idev = __in6_dev_get(dev);
60abc0be 3396 struct net *net = dev_net(dev);
c5e33bdd 3397 int run_pending = 0;
b217d616 3398 int err;
1da177e4 3399
e21e8467 3400 switch (event) {
45ba9dd2 3401 case NETDEV_REGISTER:
74235a25 3402 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
45ba9dd2 3403 idev = ipv6_add_dev(dev);
a317a2f1
WC		 3404 if (IS_ERR(idev))
3405 return notifier_from_errno(PTR_ERR(idev));
45ba9dd2
YH		 3406 }
3407 break;
bcdd553f 3408
b7b0b1d2
AD		 3409 case NETDEV_CHANGEMTU:
3410 /* if MTU under IPV6_MIN_MTU stop IPv6 on this interface. */
3411 if (dev->mtu < IPV6_MIN_MTU) {
60abc0be 3412 addrconf_ifdown(dev, dev != net->loopback_dev);
b7b0b1d2
AD		 3413 break;
3414 }
3415
3416 if (idev) {
3417 rt6_mtu_change(dev, dev->mtu);
3418 idev->cnf.mtu6 = dev->mtu;
3419 break;
3420 }
3421
3422 /* allocate new idev */
3423 idev = ipv6_add_dev(dev);
3424 if (IS_ERR(idev))
3425 break;
3426
3427 /* device is still not ready */
3428 if (!(idev->if_flags & IF_READY))
3429 break;
3430
3431 run_pending = 1;
3432
3433 /* fall through */
3434
1da177e4 3435 case NETDEV_UP:
3c21edbd 3436 case NETDEV_CHANGE:
c2edacf8
JV		 3437 if (dev->flags & IFF_SLAVE)
3438 break;
3439
3ce62a84
WC		 3440 if (idev && idev->cnf.disable_ipv6)
3441 break;
3442
3c21edbd 3443 if (event == NETDEV_UP) {
38bd10c4
DA		 3444 /* restore routes for permanent addresses */
3445 addrconf_permanent_addr(dev);
3446
1f372c7b 3447 if (!addrconf_link_ready(dev)) {
3c21edbd 3448 /* device is not ready yet. */
f3213831 3449 pr_info("ADDRCONF(NETDEV_UP): %s: link is not ready\n",
3c21edbd
YH		 3450 dev->name);
3451 break;
3452 }
99081049 3453
d31c7b8f
EP		 3454 if (!idev && dev->mtu >= IPV6_MIN_MTU)
3455 idev = ipv6_add_dev(dev);
3456
a317a2f1 3457 if (!IS_ERR_OR_NULL(idev)) {
99081049 3458 idev->if_flags |= IF_READY;
e3ec6cfc
BT		 3459 run_pending = 1;
3460 }
b7b0b1d2 3461 } else if (event == NETDEV_CHANGE) {
1f372c7b 3462 if (!addrconf_link_ready(dev)) {
3c21edbd 3463 /* device is still not ready. */
27c6fa73 3464 rt6_sync_down_dev(dev, event);
3c21edbd
YH		 3465 break;
3466 }
3467
3468 if (idev) {
a088d1d7
LL		 3469 if (idev->if_flags & IF_READY) {
3470 /* device is already configured -
3471 * but resend MLD reports, we might
3472 * have roamed and need to update
3473 * multicast snooping switches
3474 */
3475 ipv6_mc_up(idev);
27c6fa73 3476 rt6_sync_up(dev, RTNH_F_LINKDOWN);
3c21edbd 3477 break;
a088d1d7 3478 }
3c21edbd
YH		 3479 idev->if_flags |= IF_READY;
3480 }
3481
f3213831
JP		 3482 pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n",
3483 dev->name);
3c21edbd 3484
c5e33bdd 3485 run_pending = 1;
3c21edbd
YH		 3486 }
3487
e21e8467 3488 switch (dev->type) {
07a93626 3489#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4
LT		 3490 case ARPHRD_SIT:
3491 addrconf_sit_config(dev);
3492 break;
aee80b54 3493#endif
07a93626 3494#if IS_ENABLED(CONFIG_NET_IPGRE)
aee80b54 3495 case ARPHRD_IPGRE:
3496 addrconf_gre_config(dev);
3497 break;
0be669bb 3498#endif
1da177e4
LT		 3499 case ARPHRD_LOOPBACK:
3500 init_loopback(dev);
3501 break;
3502
3503 default:
3504 addrconf_dev_config(dev);
3505 break;
3ff50b79 3506 }
bcdd553f 3507
a317a2f1 3508 if (!IS_ERR_OR_NULL(idev)) {
c5e33bdd
YH		 3509 if (run_pending)
3510 addrconf_dad_run(idev);
3511
2127d95a
IS		 3512 /* Device has an address by now */
3513 rt6_sync_up(dev, RTNH_F_DEAD);
3514
bcdd553f
SH		 3515 /*
3516 * If the MTU changed during the interface down,
3517 * when the interface up, the changed MTU must be
3518 * reflected in the idev as well as routers.
1da177e4 3519 */
bcdd553f
SH		 3520 if (idev->cnf.mtu6 != dev->mtu &&
3521 dev->mtu >= IPV6_MIN_MTU) {
1da177e4
LT		 3522 rt6_mtu_change(dev, dev->mtu);
3523 idev->cnf.mtu6 = dev->mtu;
3524 }
3525 idev->tstamp = jiffies;
3526 inet6_ifinfo_notify(RTM_NEWLINK, idev);
bcdd553f
SH		 3527
3528 /*
3529 * If the changed mtu during down is lower than
3530 * IPV6_MIN_MTU stop IPv6 on this interface.
1da177e4
LT		 3531 */
3532 if (dev->mtu < IPV6_MIN_MTU)
60abc0be 3533 addrconf_ifdown(dev, dev != net->loopback_dev);
1da177e4
LT		 3534 }
3535 break;
3536
1da177e4
LT		 3537 case NETDEV_DOWN:
3538 case NETDEV_UNREGISTER:
3539 /*
3540 * Remove all addresses from this interface.
3541 */
3542 addrconf_ifdown(dev, event != NETDEV_DOWN);
3543 break;
3c21edbd 3544
1da177e4 3545 case NETDEV_CHANGENAME:
1da177e4 3546 if (idev) {
5632c515 3547 snmp6_unregister_dev(idev);
408c4768 3548 addrconf_sysctl_unregister(idev);
a317a2f1 3549 err = addrconf_sysctl_register(idev);
b217d616
HX		 3550 if (err)
3551 return notifier_from_errno(err);
a317a2f1
WC		 3552 err = snmp6_register_dev(idev);
3553 if (err) {
3554 addrconf_sysctl_unregister(idev);
3555 return notifier_from_errno(err);
3556 }
5632c515 3557 }
1da177e4 3558 break;
bcdd553f 3559
93d9b7d7
JP		 3560 case NETDEV_PRE_TYPE_CHANGE:
3561 case NETDEV_POST_TYPE_CHANGE:
3ef0952c
AL		 3562 if (idev)
3563 addrconf_type_change(dev, event);
75c78500 3564 break;
4f7f34ea
DA		 3565
3566 case NETDEV_CHANGEUPPER:
3567 info = ptr;
3568
3569 /* flush all routes if dev is linked to or unlinked from
3570 * an L3 master device (e.g., VRF)
3571 */
3572 if (info->upper_dev && netif_is_l3_master(info->upper_dev))
3573 addrconf_ifdown(dev, 0);
3ff50b79 3574 }
1da177e4
LT		 3575
3576 return NOTIFY_OK;
3577}
3578
3579/*
3580 * addrconf module should be notified of a device going up
3581 */
3582static struct notifier_block ipv6_dev_notf = {
3583 .notifier_call = addrconf_notify,
242d3a49 3584 .priority = ADDRCONF_NOTIFY_PRIORITY,
1da177e4
LT		 3585};
3586
93d9b7d7 3587static void addrconf_type_change(struct net_device *dev, unsigned long event)
75c78500
MS		 3588{
3589 struct inet6_dev *idev;
3590 ASSERT_RTNL();
3591
3592 idev = __in6_dev_get(dev);
3593
93d9b7d7 3594 if (event == NETDEV_POST_TYPE_CHANGE)
75c78500 3595 ipv6_mc_remap(idev);
93d9b7d7 3596 else if (event == NETDEV_PRE_TYPE_CHANGE)
75c78500
MS		 3597 ipv6_mc_unmap(idev);
3598}
3599
70af921d
DA		 3600static bool addr_is_local(const struct in6_addr *addr)
3601{
3602 return ipv6_addr_type(addr) &
3603 (IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK);
3604}
3605
1da177e4
LT		 3606static int addrconf_ifdown(struct net_device *dev, int how)
3607{
4c981e28 3608 unsigned long event = how ? NETDEV_UNREGISTER : NETDEV_DOWN;
c346dca1 3609 struct net *net = dev_net(dev);
502a2ffd 3610 struct inet6_dev *idev;
f1705ec1 3611 struct inet6_ifaddr *ifa, *tmp;
f1705ec1
DA		 3612 int _keep_addr;
3613 bool keep_addr;
73a8bd74 3614 int state, i;
1da177e4
LT		 3615
3616 ASSERT_RTNL();
3617
4c981e28 3618 rt6_disable_ip(dev, event);
1da177e4
LT		 3619
3620 idev = __in6_dev_get(dev);
63159f29 3621 if (!idev)
1da177e4
LT		 3622 return -ENODEV;
3623
bcdd553f
SH		 3624 /*
3625 * Step 1: remove reference to ipv6 device from parent device.
3626 * Do not dev_put!
1da177e4 3627 */
439e2385 3628 if (how) {
1da177e4 3629 idev->dead = 1;
8814c4b5
YH		 3630
3631 /* protected by rtnl_lock */
a9b3cd7f 3632 RCU_INIT_POINTER(dev->ip6_ptr, NULL);
1da177e4
LT		 3633
3634 /* Step 1.5: remove snmp6 entry */
3635 snmp6_unregister_dev(idev);
3636
3637 }
3638
f1705ec1
DA		 3639 /* aggregate the system setting and interface setting */
3640 _keep_addr = net->ipv6.devconf_all->keep_addr_on_down;
3641 if (!_keep_addr)
3642 _keep_addr = idev->cnf.keep_addr_on_down;
3643
3644 /* combine the user config with event to determine if permanent
3645 * addresses are to be removed from address hash table
3646 */
bc561632 3647 keep_addr = !(how || _keep_addr <= 0 || idev->cnf.disable_ipv6);
f1705ec1 3648
73a8bd74
DM		 3649 /* Step 2: clear hash table */
3650 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3651 struct hlist_head *h = &inet6_addr_lst[i];
73a8bd74
DM		 3652
3653 spin_lock_bh(&addrconf_hash_lock);
67ba4152 3654restart:
b67bfe0d 3655 hlist_for_each_entry_rcu(ifa, h, addr_lst) {
73a8bd74 3656 if (ifa->idev == idev) {
c15b1cca 3657 addrconf_del_dad_work(ifa);
f1705ec1
DA		 3658 /* combined flag + permanent flag decide if
3659 * address is retained on a down event
3660 */
3661 if (!keep_addr ||
70af921d
DA		 3662 !(ifa->flags & IFA_F_PERMANENT) ||
3663 addr_is_local(&ifa->addr)) {
f1705ec1
DA		 3664 hlist_del_init_rcu(&ifa->addr_lst);
3665 goto restart;
3666 }
73a8bd74
DM		 3667 }
3668 }
3669 spin_unlock_bh(&addrconf_hash_lock);
3670 }
3671
1da177e4
LT		 3672 write_lock_bh(&idev->lock);
3673
b7b1bfce
HFS		 3674 addrconf_del_rs_timer(idev);
3675
bcdd553f 3676 /* Step 2: clear flags for stateless addrconf */
439e2385 3677 if (!how)
3c21edbd 3678 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
1da177e4 3679
bcdd553f 3680 /* Step 3: clear tempaddr list */
372e6c8f 3681 while (!list_empty(&idev->tempaddr_list)) {
3682 ifa = list_first_entry(&idev->tempaddr_list,
3683 struct inet6_ifaddr, tmp_list);
3684 list_del(&ifa->tmp_list);
1da177e4
LT		 3685 write_unlock_bh(&idev->lock);
3686 spin_lock_bh(&ifa->lock);
3687
3688 if (ifa->ifpub) {
3689 in6_ifa_put(ifa->ifpub);
3690 ifa->ifpub = NULL;
3691 }
3692 spin_unlock_bh(&ifa->lock);
3693 in6_ifa_put(ifa);
3694 write_lock_bh(&idev->lock);
3695 }
8f37ada5 3696
f1705ec1
DA		 3697 /* re-combine the user config with event to determine if permanent
3698 * addresses are to be removed from the interface list
3699 */
bc561632 3700 keep_addr = (!how && _keep_addr > 0 && !idev->cnf.disable_ipv6);
84e8b803 3701
f1705ec1 3702 list_for_each_entry_safe(ifa, tmp, &idev->addr_list, if_list) {
38bd10c4 3703 struct rt6_info *rt = NULL;
a2d6cbb0 3704 bool keep;
38bd10c4 3705
f1705ec1 3706 addrconf_del_dad_work(ifa);
84e8b803 3707
a2d6cbb0
RV		 3708 keep = keep_addr && (ifa->flags & IFA_F_PERMANENT) &&
3709 !addr_is_local(&ifa->addr);
a2d6cbb0 3710
73a8bd74 3711 write_unlock_bh(&idev->lock);
8e8e676d 3712 spin_lock_bh(&ifa->lock);
f1705ec1 3713
a2d6cbb0 3714 if (keep) {
f1705ec1
DA		 3715 /* set state to skip the notifier below */
3716 state = INET6_IFADDR_STATE_DEAD;
6d717134 3717 ifa->state = INET6_IFADDR_STATE_PREDAD;
f1705ec1
DA		 3718 if (!(ifa->flags & IFA_F_NODAD))
3719 ifa->flags |= IFA_F_TENTATIVE;
38bd10c4
DA		 3720
3721 rt = ifa->rt;
3722 ifa->rt = NULL;
f1705ec1
DA		 3723 } else {
3724 state = ifa->state;
3725 ifa->state = INET6_IFADDR_STATE_DEAD;
f1705ec1
DA		 3726 }
3727
8e8e676d 3728 spin_unlock_bh(&ifa->lock);
9d82ca98 3729
38bd10c4
DA		 3730 if (rt)
3731 ip6_del_rt(rt);
3732
73a8bd74
DM		 3733 if (state != INET6_IFADDR_STATE_DEAD) {
3734 __ipv6_ifa_notify(RTM_DELADDR, ifa);
f88c91dd 3735 inet6addr_notifier_call_chain(NETDEV_DOWN, ifa);
ea06f717
MM		 3736 } else {
3737 if (idev->cnf.forwarding)
3738 addrconf_leave_anycast(ifa);
3739 addrconf_leave_solict(ifa->idev, &ifa->addr);
27bdb2ab 3740 }
8f37ada5 3741
73a8bd74 3742 write_lock_bh(&idev->lock);
8ef802aa
ED		 3743 if (!keep) {
3744 list_del_rcu(&ifa->if_list);
3745 in6_ifa_put(ifa);
3746 }
73a8bd74 3747 }
8f37ada5 3748
1da177e4
LT		 3749 write_unlock_bh(&idev->lock);
3750
381f4dca
SD		 3751 /* Step 5: Discard anycast and multicast list */
3752 if (how) {
3753 ipv6_ac_destroy_dev(idev);
1da177e4 3754 ipv6_mc_destroy_dev(idev);
381f4dca 3755 } else {
1da177e4 3756 ipv6_mc_down(idev);
381f4dca 3757 }
1da177e4 3758
1da177e4 3759 idev->tstamp = jiffies;
1ab1457c 3760
bcdd553f 3761 /* Last: Shot the device (if unregistered) */
439e2385 3762 if (how) {
408c4768 3763 addrconf_sysctl_unregister(idev);
1da177e4
LT		 3764 neigh_parms_release(&nd_tbl, idev->nd_parms);
3765 neigh_ifdown(&nd_tbl, dev);
3766 in6_dev_put(idev);
3767 }
3768 return 0;
3769}
3770
e99e88a9 3771static void addrconf_rs_timer(struct timer_list *t)
1da177e4 3772{
e99e88a9 3773 struct inet6_dev *idev = from_timer(idev, t, rs_timer);
caf92bc4 3774 struct net_device *dev = idev->dev;
b7b1bfce 3775 struct in6_addr lladdr;
1da177e4 3776
b7b1bfce 3777 write_lock(&idev->lock);
5b2a1953 3778 if (idev->dead || !(idev->if_flags & IF_READY))
1da177e4
LT		 3779 goto out;
3780
9ba2add3 3781 if (!ipv6_accept_ra(idev))
5b2a1953 3782 goto out;
3783
3784 /* Announcement received after solicitation was sent */
3785 if (idev->if_flags & IF_RA_RCVD)
1da177e4 3786 goto out;
1da177e4 3787
bd11f074 3788 if (idev->rs_probes++ < idev->cnf.rtr_solicits || idev->cnf.rtr_solicits < 0) {
caf92bc4
CW		 3789 write_unlock(&idev->lock);
3790 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
3791 ndisc_send_rs(dev, &lladdr,
b7b1bfce
HFS		 3792 &in6addr_linklocal_allrouters);
3793 else
caf92bc4 3794 goto put;
1da177e4 3795
caf92bc4 3796 write_lock(&idev->lock);
bd11f074
MŻ		 3797 idev->rs_interval = rfc3315_s14_backoff_update(
3798 idev->rs_interval, idev->cnf.rtr_solicit_max_interval);
b7b1bfce
HFS		 3799 /* The wait after the last probe can be shorter */
3800 addrconf_mod_rs_timer(idev, (idev->rs_probes ==
3801 idev->cnf.rtr_solicits) ?
3802 idev->cnf.rtr_solicit_delay :
bd11f074 3803 idev->rs_interval);
1da177e4 3804 } else {
1da177e4
LT		 3805 /*
3806 * Note: we do not support deprecated "all on-link"
3807 * assumption any longer.
3808 */
91df42be 3809 pr_debug("%s: no IPv6 routers present\n", idev->dev->name);
1da177e4
LT		 3810 }
3811
3812out:
b7b1bfce 3813 write_unlock(&idev->lock);
caf92bc4 3814put:
b7b1bfce 3815 in6_dev_put(idev);
1da177e4
LT		 3816}
3817
3818/*
3819 * Duplicate Address Detection
3820 */
3c21edbd
YH		 3821static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
3822{
3823 unsigned long rand_num;
3824 struct inet6_dev *idev = ifp->idev;
adc176c5 3825 u64 nonce;
3c21edbd 3826
95c385b4
NH		 3827 if (ifp->flags & IFA_F_OPTIMISTIC)
3828 rand_num = 0;
3829 else
63862b5b 3830 rand_num = prandom_u32() % (idev->cnf.rtr_solicit_delay ? : 1);
95c385b4 3831
adc176c5
EN		 3832 nonce = 0;
3833 if (idev->cnf.enhanced_dad ||
3834 dev_net(idev->dev)->ipv6.devconf_all->enhanced_dad) {
3835 do
3836 get_random_bytes(&nonce, 6);
3837 while (nonce == 0);
3838 }
3839 ifp->dad_nonce = nonce;
b7b1bfce 3840 ifp->dad_probes = idev->cnf.dad_transmits;
c15b1cca 3841 addrconf_mod_dad_work(ifp, rand_num);
3c21edbd
YH		 3842}
3843
c15b1cca 3844static void addrconf_dad_begin(struct inet6_ifaddr *ifp)
1da177e4
LT		 3845{
3846 struct inet6_dev *idev = ifp->idev;
3847 struct net_device *dev = idev->dev;
764d3be6 3848 bool bump_id, notify = false;
1da177e4
LT		 3849
3850 addrconf_join_solict(dev, &ifp->addr);
3851
63862b5b 3852 prandom_seed((__force u32) ifp->addr.s6_addr32[3]);
1da177e4
LT		 3853
3854 read_lock_bh(&idev->lock);
622ccdf1 3855 spin_lock(&ifp->lock);
e9d3e084 3856 if (ifp->state == INET6_IFADDR_STATE_DEAD)
1da177e4 3857 goto out;
1da177e4
LT		 3858
3859 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
a2d3f3e3
MC		 3860 (dev_net(dev)->ipv6.devconf_all->accept_dad < 1 &&
3861 idev->cnf.accept_dad < 1) ||
55ebaef1
NT		 3862 !(ifp->flags&IFA_F_TENTATIVE) ||
3863 ifp->flags & IFA_F_NODAD) {
c76fe2d9
DA		 3864 bool send_na = false;
3865
3866 if (ifp->flags & IFA_F_TENTATIVE &&
3867 !(ifp->flags & IFA_F_OPTIMISTIC))
3868 send_na = true;
764d3be6 3869 bump_id = ifp->flags & IFA_F_TENTATIVE;
cc411d0b 3870 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
21809faf 3871 spin_unlock(&ifp->lock);
1da177e4
LT		 3872 read_unlock_bh(&idev->lock);
3873
c76fe2d9 3874 addrconf_dad_completed(ifp, bump_id, send_na);
1da177e4
LT		 3875 return;
3876 }
3877
6732bade 3878 if (!(idev->if_flags & IF_READY)) {
21809faf 3879 spin_unlock(&ifp->lock);
6732bade 3880 read_unlock_bh(&idev->lock);
3c21edbd 3881 /*
590a9887 3882 * If the device is not ready:
3c21edbd
YH		 3883 * - keep it tentative if it is a permanent address.
3884 * - otherwise, kill it.
3885 */
3886 in6_ifa_hold(ifp);
cc411d0b 3887 addrconf_dad_stop(ifp, 0);
6732bade 3888 return;
3c21edbd 3889 }
95c385b4
NH		 3890
3891 /*
3892 * Optimistic nodes can start receiving
3893 * Frames right away
3894 */
7fd2561e 3895 if (ifp->flags & IFA_F_OPTIMISTIC) {
95c385b4 3896 ip6_ins_rt(ifp->rt);
35e015e1 3897 if (ipv6_use_optimistic_addr(dev_net(dev), idev)) {
7fd2561e
EK		 3898 /* Because optimistic nodes can use this address,
3899 * notify listeners. If DAD fails, RTM_DELADDR is sent.
3900 */
16186a82 3901 notify = true;
7fd2561e
EK		 3902 }
3903 }
95c385b4 3904
6732bade 3905 addrconf_dad_kick(ifp);
1da177e4 3906out:
622ccdf1 3907 spin_unlock(&ifp->lock);
1da177e4 3908 read_unlock_bh(&idev->lock);
16186a82 3909 if (notify)
3910 ipv6_ifa_notify(RTM_NEWADDR, ifp);
1da177e4
LT		 3911}
3912
c15b1cca 3913static void addrconf_dad_start(struct inet6_ifaddr *ifp)
1da177e4 3914{
c15b1cca
HFS		 3915 bool begin_dad = false;
3916
8e8e676d 3917 spin_lock_bh(&ifp->lock);
c15b1cca
HFS		 3918 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
3919 ifp->state = INET6_IFADDR_STATE_PREDAD;
3920 begin_dad = true;
3921 }
8e8e676d 3922 spin_unlock_bh(&ifp->lock);
c15b1cca
HFS		 3923
3924 if (begin_dad)
3925 addrconf_mod_dad_work(ifp, 0);
3926}
3927
3928static void addrconf_dad_work(struct work_struct *w)
3929{
3930 struct inet6_ifaddr *ifp = container_of(to_delayed_work(w),
3931 struct inet6_ifaddr,
3932 dad_work);
1da177e4 3933 struct inet6_dev *idev = ifp->idev;
764d3be6 3934 bool bump_id, disable_ipv6 = false;
1da177e4
LT		 3935 struct in6_addr mcaddr;
3936
c15b1cca
HFS		 3937 enum {
3938 DAD_PROCESS,
3939 DAD_BEGIN,
3940 DAD_ABORT,
3941 } action = DAD_PROCESS;
3942
3943 rtnl_lock();
3944
8e8e676d 3945 spin_lock_bh(&ifp->lock);
c15b1cca
HFS		 3946 if (ifp->state == INET6_IFADDR_STATE_PREDAD) {
3947 action = DAD_BEGIN;
3948 ifp->state = INET6_IFADDR_STATE_DAD;
3949 } else if (ifp->state == INET6_IFADDR_STATE_ERRDAD) {
3950 action = DAD_ABORT;
3951 ifp->state = INET6_IFADDR_STATE_POSTDAD;
85b51b12 3952
35e015e1
MC		 3953 if ((dev_net(idev->dev)->ipv6.devconf_all->accept_dad > 1 ||
3954 idev->cnf.accept_dad > 1) &&
3955 !idev->cnf.disable_ipv6 &&
85b51b12
MM		 3956 !(ifp->flags & IFA_F_STABLE_PRIVACY)) {
3957 struct in6_addr addr;
3958
3959 addr.s6_addr32[0] = htonl(0xfe800000);
3960 addr.s6_addr32[1] = 0;
3961
3962 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
3963 ipv6_addr_equal(&ifp->addr, &addr)) {
3964 /* DAD failed for link-local based on MAC */
3965 idev->cnf.disable_ipv6 = 1;
3966
3967 pr_info("%s: IPv6 being disabled!\n",
3968 ifp->idev->dev->name);
3969 disable_ipv6 = true;
3970 }
3971 }
c15b1cca 3972 }
8e8e676d 3973 spin_unlock_bh(&ifp->lock);
c15b1cca
HFS		 3974
3975 if (action == DAD_BEGIN) {
3976 addrconf_dad_begin(ifp);
3977 goto out;
3978 } else if (action == DAD_ABORT) {
751eb6b6 3979 in6_ifa_hold(ifp);
c15b1cca 3980 addrconf_dad_stop(ifp, 1);
85b51b12
MM		 3981 if (disable_ipv6)
3982 addrconf_ifdown(idev->dev, 0);
c15b1cca
HFS		 3983 goto out;
3984 }
3985
b7b1bfce 3986 if (!ifp->dad_probes && addrconf_dad_end(ifp))
f2344a13
HX		 3987 goto out;
3988
c15b1cca 3989 write_lock_bh(&idev->lock);
122e4519 3990 if (idev->dead || !(idev->if_flags & IF_READY)) {
c15b1cca 3991 write_unlock_bh(&idev->lock);
1da177e4
LT		 3992 goto out;
3993 }
21809faf 3994
3995 spin_lock(&ifp->lock);
622ccdf1
HX		 3996 if (ifp->state == INET6_IFADDR_STATE_DEAD) {
3997 spin_unlock(&ifp->lock);
c15b1cca 3998 write_unlock_bh(&idev->lock);
622ccdf1
HX		 3999 goto out;
4000 }
4001
b7b1bfce 4002 if (ifp->dad_probes == 0) {
c76fe2d9
DA		 4003 bool send_na = false;
4004
1da177e4
LT		 4005 /*
4006 * DAD was successful
4007 */
4008
c76fe2d9
DA		 4009 if (ifp->flags & IFA_F_TENTATIVE &&
4010 !(ifp->flags & IFA_F_OPTIMISTIC))
4011 send_na = true;
764d3be6 4012 bump_id = ifp->flags & IFA_F_TENTATIVE;
cc411d0b 4013 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
21809faf 4014 spin_unlock(&ifp->lock);
c15b1cca 4015 write_unlock_bh(&idev->lock);
1da177e4 4016
c76fe2d9 4017 addrconf_dad_completed(ifp, bump_id, send_na);
1da177e4
LT		 4018
4019 goto out;
4020 }
4021
b7b1bfce 4022 ifp->dad_probes--;
c15b1cca
HFS		 4023 addrconf_mod_dad_work(ifp,
4024 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME));
21809faf 4025 spin_unlock(&ifp->lock);
c15b1cca 4026 write_unlock_bh(&idev->lock);
1da177e4
LT		 4027
4028 /* send a neighbour solicitation for our addr */
1da177e4 4029 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
adc176c5
EN		 4030 ndisc_send_ns(ifp->idev->dev, &ifp->addr, &mcaddr, &in6addr_any,
4031 ifp->dad_nonce);
1da177e4
LT		 4032out:
4033 in6_ifa_put(ifp);
c15b1cca 4034 rtnl_unlock();
1da177e4
LT		 4035}
4036
11ffff75
HFS		 4037/* ifp->idev must be at least read locked */
4038static bool ipv6_lonely_lladdr(struct inet6_ifaddr *ifp)
4039{
4040 struct inet6_ifaddr *ifpiter;
4041 struct inet6_dev *idev = ifp->idev;
4042
602582ca
HFS		 4043 list_for_each_entry_reverse(ifpiter, &idev->addr_list, if_list) {
4044 if (ifpiter->scope > IFA_LINK)
4045 break;
11ffff75
HFS		 4046 if (ifp != ifpiter && ifpiter->scope == IFA_LINK &&
4047 (ifpiter->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE|
4048 IFA_F_OPTIMISTIC|IFA_F_DADFAILED)) ==
4049 IFA_F_PERMANENT)
4050 return false;
4051 }
4052 return true;
4053}
4054
c76fe2d9
DA		 4055static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id,
4056 bool send_na)
1da177e4 4057{
e21e8467 4058 struct net_device *dev = ifp->idev->dev;
b7b1bfce 4059 struct in6_addr lladdr;
b173ee48 4060 bool send_rs, send_mld;
b7b1bfce 4061
c15b1cca 4062 addrconf_del_dad_work(ifp);
1da177e4
LT		 4063
4064 /*
4065 * Configure the address for reception. Now it is valid.
4066 */
4067
4068 ipv6_ifa_notify(RTM_NEWADDR, ifp);
4069
026359bc
TA		 4070 /* If added prefix is link local and we are prepared to process
4071 router advertisements, start sending router solicitations.
1da177e4
LT		 4072 */
4073
1ec047eb 4074 read_lock_bh(&ifp->idev->lock);
11ffff75 4075 send_mld = ifp->scope == IFA_LINK && ipv6_lonely_lladdr(ifp);
b173ee48
HFS		 4076 send_rs = send_mld &&
4077 ipv6_accept_ra(ifp->idev) &&
bd11f074 4078 ifp->idev->cnf.rtr_solicits != 0 &&
b173ee48 4079 (dev->flags&IFF_LOOPBACK) == 0;
1ec047eb
HFS		 4080 read_unlock_bh(&ifp->idev->lock);
4081
b173ee48
HFS		 4082 /* While dad is in progress mld report's source address is in6_addrany.
4083 * Resend with proper ll now.
4084 */
4085 if (send_mld)
4086 ipv6_mc_dad_complete(ifp->idev);
4087
c76fe2d9
DA		 4088 /* send unsolicited NA if enabled */
4089 if (send_na &&
4090 (ifp->idev->cnf.ndisc_notify ||
4091 dev_net(dev)->ipv6.devconf_all->ndisc_notify)) {
4092 ndisc_send_na(dev, &in6addr_linklocal_allnodes, &ifp->addr,
4093 /*router=*/ !!ifp->idev->cnf.forwarding,
4094 /*solicited=*/ false, /*override=*/ true,
4095 /*inc_opt=*/ true);
4096 }
4097
1ec047eb 4098 if (send_rs) {
1da177e4
LT		 4099 /*
4100 * If a host as already performed a random delay
4101 * [...] as part of DAD [...] there is no need
4102 * to delay again before sending the first RS
4103 */
1ec047eb 4104 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
b7b1bfce 4105 return;
1ec047eb 4106 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters);
1da177e4 4107
b7b1bfce
HFS		 4108 write_lock_bh(&ifp->idev->lock);
4109 spin_lock(&ifp->lock);
bd11f074
MŻ		 4110 ifp->idev->rs_interval = rfc3315_s14_backoff_init(
4111 ifp->idev->cnf.rtr_solicit_interval);
b7b1bfce 4112 ifp->idev->rs_probes = 1;
1da177e4 4113 ifp->idev->if_flags |= IF_RS_SENT;
bd11f074 4114 addrconf_mod_rs_timer(ifp->idev, ifp->idev->rs_interval);
b7b1bfce
HFS		 4115 spin_unlock(&ifp->lock);
4116 write_unlock_bh(&ifp->idev->lock);
1da177e4 4117 }
764d3be6
PA		 4118
4119 if (bump_id)
4120 rt_genid_bump_ipv6(dev_net(dev));
a11a7f71
MH		 4121
4122 /* Make sure that a new temporary address will be created
4123 * before this temporary address becomes deprecated.
4124 */
4125 if (ifp->flags & IFA_F_TEMPORARY)
4126 addrconf_verify_rtnl();
1da177e4
LT		 4127}
4128
e21e8467
SH		 4129static void addrconf_dad_run(struct inet6_dev *idev)
4130{
c5e33bdd
YH		 4131 struct inet6_ifaddr *ifp;
4132
4133 read_lock_bh(&idev->lock);
502a2ffd 4134 list_for_each_entry(ifp, &idev->addr_list, if_list) {
21809faf 4135 spin_lock(&ifp->lock);
f2344a13
HX		 4136 if (ifp->flags & IFA_F_TENTATIVE &&
4137 ifp->state == INET6_IFADDR_STATE_DAD)
4138 addrconf_dad_kick(ifp);
21809faf 4139 spin_unlock(&ifp->lock);
c5e33bdd
YH		 4140 }
4141 read_unlock_bh(&idev->lock);
4142}
4143
1da177e4
LT		 4144#ifdef CONFIG_PROC_FS
4145struct if6_iter_state {
3c40090a 4146 struct seq_net_private p;
1da177e4 4147 int bucket;
1d578303 4148 int offset;
1da177e4
LT		 4149};
4150
1d578303 4151static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos)
1da177e4 4152{
1da177e4 4153 struct if6_iter_state *state = seq->private;
1218854a 4154 struct net *net = seq_file_net(seq);
a5c1d98f 4155 struct inet6_ifaddr *ifa = NULL;
1d578303 4156 int p = 0;
1da177e4 4157
1d578303
MM		 4158 /* initial bucket if pos is 0 */
4159 if (pos == 0) {
4160 state->bucket = 0;
4161 state->offset = 0;
4162 }
4163
4164 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
a5c1d98f 4165 hlist_for_each_entry_rcu(ifa, &inet6_addr_lst[state->bucket],
1d578303 4166 addr_lst) {
9f0d3c27
ED		 4167 if (!net_eq(dev_net(ifa->idev->dev), net))
4168 continue;
1d578303
MM		 4169 /* sync with offset */
4170 if (p < state->offset) {
4171 p++;
4172 continue;
4173 }
4174 state->offset++;
9f0d3c27 4175 return ifa;
1d578303
MM		 4176 }
4177
4178 /* prepare for next bucket */
4179 state->offset = 0;
4180 p = 0;
1da177e4 4181 }
c2e21293 4182 return NULL;
1da177e4
LT		 4183}
4184
c2e21293 4185static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
4186 struct inet6_ifaddr *ifa)
1da177e4
LT		 4187{
4188 struct if6_iter_state *state = seq->private;
1218854a 4189 struct net *net = seq_file_net(seq);
1da177e4 4190
a5c1d98f 4191 hlist_for_each_entry_continue_rcu(ifa, addr_lst) {
9f0d3c27
ED		 4192 if (!net_eq(dev_net(ifa->idev->dev), net))
4193 continue;
1d578303 4194 state->offset++;
9f0d3c27 4195 return ifa;
1d578303 4196 }
3c40090a 4197
c2e21293 4198 while (++state->bucket < IN6_ADDR_HSIZE) {
1d578303 4199 state->offset = 0;
a5c1d98f 4200 hlist_for_each_entry_rcu(ifa,
c2e21293 4201 &inet6_addr_lst[state->bucket], addr_lst) {
9f0d3c27
ED		 4202 if (!net_eq(dev_net(ifa->idev->dev), net))
4203 continue;
1d578303 4204 state->offset++;
9f0d3c27 4205 return ifa;
c2e21293 4206 }
1da177e4 4207 }
3c40090a 4208
c2e21293 4209 return NULL;
1da177e4
LT		 4210}
4211
1da177e4 4212static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
a5c1d98f 4213 __acquires(rcu)
1da177e4 4214{
a5c1d98f 4215 rcu_read_lock();
1d578303 4216 return if6_get_first(seq, *pos);
1da177e4
LT		 4217}
4218
4219static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
4220{
4221 struct inet6_ifaddr *ifa;
4222
4223 ifa = if6_get_next(seq, v);
4224 ++*pos;
4225 return ifa;
4226}
4227
4228static void if6_seq_stop(struct seq_file *seq, void *v)
a5c1d98f 4229 __releases(rcu)
1da177e4 4230{
a5c1d98f 4231 rcu_read_unlock();
1da177e4
LT		 4232}
4233
4234static int if6_seq_show(struct seq_file *seq, void *v)
4235{
4236 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
971a351c 4237 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
b071195d 4238 &ifp->addr,
1da177e4
LT		 4239 ifp->idev->dev->ifindex,
4240 ifp->prefix_len,
4241 ifp->scope,
971a351c 4242 (u8) ifp->flags,
1da177e4
LT		 4243 ifp->idev->dev->name);
4244 return 0;
4245}
4246
56b3d975 4247static const struct seq_operations if6_seq_ops = {
1da177e4
LT		 4248 .start = if6_seq_start,
4249 .next = if6_seq_next,
4250 .show = if6_seq_show,
4251 .stop = if6_seq_stop,
4252};
4253
4254static int if6_seq_open(struct inode *inode, struct file *file)
4255{
3c40090a
DL		 4256 return seq_open_net(inode, file, &if6_seq_ops,
4257 sizeof(struct if6_iter_state));
1da177e4
LT		 4258}
4259
9a32144e 4260static const struct file_operations if6_fops = {
1da177e4
LT		 4261 .open = if6_seq_open,
4262 .read = seq_read,
4263 .llseek = seq_lseek,
3c40090a 4264 .release = seq_release_net,
1da177e4
LT		 4265};
4266
2c8c1e72 4267static int __net_init if6_proc_net_init(struct net *net)
1da177e4 4268{
d4beaa66 4269 if (!proc_create("if_inet6", S_IRUGO, net->proc_net, &if6_fops))
1da177e4
LT		 4270 return -ENOMEM;
4271 return 0;
4272}
4273
2c8c1e72 4274static void __net_exit if6_proc_net_exit(struct net *net)
3c40090a 4275{
ece31ffd 4276 remove_proc_entry("if_inet6", net->proc_net);
3c40090a
DL		 4277}
4278
4279static struct pernet_operations if6_proc_net_ops = {
67ba4152
IM		 4280 .init = if6_proc_net_init,
4281 .exit = if6_proc_net_exit,
50911411 4282 .async = true,
3c40090a
DL		 4283};
4284
4285int __init if6_proc_init(void)
4286{
4287 return register_pernet_subsys(&if6_proc_net_ops);
4288}
4289
1da177e4
LT		 4290void if6_proc_exit(void)
4291{
3c40090a 4292 unregister_pernet_subsys(&if6_proc_net_ops);
1da177e4
LT		 4293}
4294#endif /* CONFIG_PROC_FS */
4295
07a93626 4296#if IS_ENABLED(CONFIG_IPV6_MIP6)
3b9f9a1c 4297/* Check if address is a home address configured on any interface. */
b71d1d42 4298int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr)
3b9f9a1c 4299{
3f27fb23 4300 unsigned int hash = inet6_addr_hash(net, addr);
c2e21293 4301 struct inet6_ifaddr *ifp = NULL;
3f27fb23 4302 int ret = 0;
c2e21293 4303
4e5f47ab
ED		 4304 rcu_read_lock();
4305 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
878628fb 4306 if (!net_eq(dev_net(ifp->idev->dev), net))
389f6612 4307 continue;
caad295f 4308 if (ipv6_addr_equal(&ifp->addr, addr) &&
3b9f9a1c
NT		 4309 (ifp->flags & IFA_F_HOMEADDRESS)) {
4310 ret = 1;
4311 break;
4312 }
4313 }
4e5f47ab 4314 rcu_read_unlock();
3b9f9a1c
NT		 4315 return ret;
4316}
4317#endif
4318
1da177e4
LT		 4319/*
4320 * Periodic address status verification
4321 */
4322
c15b1cca 4323static void addrconf_verify_rtnl(void)
1da177e4 4324{
b2db7564 4325 unsigned long now, next, next_sec, next_sched;
1da177e4 4326 struct inet6_ifaddr *ifp;
1da177e4
LT		 4327 int i;
4328
c15b1cca
HFS		 4329 ASSERT_RTNL();
4330
5c578aed 4331 rcu_read_lock_bh();
1da177e4 4332 now = jiffies;
b2db7564 4333 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
1da177e4 4334
c15b1cca 4335 cancel_delayed_work(&addr_chk_work);
1da177e4 4336
bcdd553f 4337 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
1da177e4 4338restart:
c15b1cca 4339 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[i], addr_lst) {
1da177e4 4340 unsigned long age;
1da177e4 4341
fad8da3e
YA		 4342 /* When setting preferred_lft to a value not zero or
4343 * infinity, while valid_lft is infinity
4344 * IFA_F_PERMANENT has a non-infinity life time.
4345 */
4346 if ((ifp->flags & IFA_F_PERMANENT) &&
4347 (ifp->prefered_lft == INFINITY_LIFE_TIME))
1da177e4
LT		 4348 continue;
4349
4350 spin_lock(&ifp->lock);
b2db7564
YH		 4351 /* We try to batch several events at once. */
4352 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
1da177e4 4353
8f27ebb9
YH		 4354 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
4355 age >= ifp->valid_lft) {
1da177e4
LT		 4356 spin_unlock(&ifp->lock);
4357 in6_ifa_hold(ifp);
1da177e4
LT		 4358 ipv6_del_addr(ifp);
4359 goto restart;
8f27ebb9
YH		 4360 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
4361 spin_unlock(&ifp->lock);
4362 continue;
1da177e4 4363 } else if (age >= ifp->prefered_lft) {
a1ed0526 4364 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
1da177e4
LT		 4365 int deprecate = 0;
4366
4367 if (!(ifp->flags&IFA_F_DEPRECATED)) {
4368 deprecate = 1;
4369 ifp->flags |= IFA_F_DEPRECATED;
4370 }
4371
fad8da3e
YA		 4372 if ((ifp->valid_lft != INFINITY_LIFE_TIME) &&
4373 (time_before(ifp->tstamp + ifp->valid_lft * HZ, next)))
1da177e4
LT		 4374 next = ifp->tstamp + ifp->valid_lft * HZ;
4375
4376 spin_unlock(&ifp->lock);
4377
4378 if (deprecate) {
4379 in6_ifa_hold(ifp);
1da177e4
LT		 4380
4381 ipv6_ifa_notify(0, ifp);
4382 in6_ifa_put(ifp);
4383 goto restart;
4384 }
1da177e4
LT		 4385 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
4386 !(ifp->flags&IFA_F_TENTATIVE)) {
88949cf4 4387 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
4388 ifp->idev->cnf.dad_transmits *
1f9248e5 4389 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME) / HZ;
88949cf4 4390
1da177e4
LT		 4391 if (age >= ifp->prefered_lft - regen_advance) {
4392 struct inet6_ifaddr *ifpub = ifp->ifpub;
4393 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
4394 next = ifp->tstamp + ifp->prefered_lft * HZ;
4395 if (!ifp->regen_count && ifpub) {
4396 ifp->regen_count++;
4397 in6_ifa_hold(ifp);
4398 in6_ifa_hold(ifpub);
4399 spin_unlock(&ifp->lock);
5c578aed 4400
291d809b
HY		 4401 spin_lock(&ifpub->lock);
4402 ifpub->regen_count = 0;
4403 spin_unlock(&ifpub->lock);
e64e469b 4404 rcu_read_unlock_bh();
fffcefe9 4405 ipv6_create_tempaddr(ifpub, ifp, true);
1da177e4
LT		 4406 in6_ifa_put(ifpub);
4407 in6_ifa_put(ifp);
e64e469b 4408 rcu_read_lock_bh();
1da177e4
LT		 4409 goto restart;
4410 }
4411 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
4412 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
4413 spin_unlock(&ifp->lock);
1da177e4
LT		 4414 } else {
4415 /* ifp->prefered_lft <= ifp->valid_lft */
4416 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
4417 next = ifp->tstamp + ifp->prefered_lft * HZ;
4418 spin_unlock(&ifp->lock);
4419 }
4420 }
1da177e4
LT		 4421 }
4422
b2db7564
YH		 4423 next_sec = round_jiffies_up(next);
4424 next_sched = next;
4425
4426 /* If rounded timeout is accurate enough, accept it. */
4427 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
4428 next_sched = next_sec;
4429
4430 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
4431 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
4432 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
4433
ba3542e1 4434 ADBG(KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
4435 now, next, next_sec, next_sched);
c15b1cca 4436 mod_delayed_work(addrconf_wq, &addr_chk_work, next_sched - now);
5c578aed 4437 rcu_read_unlock_bh();
1da177e4
LT		 4438}
4439
c15b1cca
HFS		 4440static void addrconf_verify_work(struct work_struct *w)
4441{
4442 rtnl_lock();
4443 addrconf_verify_rtnl();
4444 rtnl_unlock();
4445}
4446
4447static void addrconf_verify(void)
4448{
4449 mod_delayed_work(addrconf_wq, &addr_chk_work, 0);
4450}
4451
caeaba79
ND		 4452static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local,
4453 struct in6_addr **peer_pfx)
461d8837
TG		 4454{
4455 struct in6_addr *pfx = NULL;
4456
caeaba79
ND		 4457 *peer_pfx = NULL;
4458
461d8837
TG		 4459 if (addr)
4460 pfx = nla_data(addr);
4461
4462 if (local) {
4463 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
caeaba79
ND		 4464 *peer_pfx = pfx;
4465 pfx = nla_data(local);
461d8837
TG		 4466 }
4467
4468 return pfx;
4469}
4470
ef7c79ed 4471static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
461d8837
TG		 4472 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
4473 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
4474 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
479840ff 4475 [IFA_FLAGS] = { .len = sizeof(u32) },
461d8837
TG		 4476};
4477
1da177e4 4478static int
c21ef3e3
DA		 4479inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh,
4480 struct netlink_ext_ack *extack)
1da177e4 4481{
3b1e0a65 4482 struct net *net = sock_net(skb->sk);
b933f716
TG		 4483 struct ifaddrmsg *ifm;
4484 struct nlattr *tb[IFA_MAX+1];
caeaba79 4485 struct in6_addr *pfx, *peer_pfx;
6046d5b4 4486 u32 ifa_flags;
b933f716 4487 int err;
1da177e4 4488
fceb6435 4489 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy,
c21ef3e3 4490 extack);
b933f716
TG		 4491 if (err < 0)
4492 return err;
4493
4494 ifm = nlmsg_data(nlh);
caeaba79 4495 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
63159f29 4496 if (!pfx)
1da177e4
LT		 4497 return -EINVAL;
4498
6046d5b4
HK		 4499 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
4500
4501 /* We ignore other flags so far. */
4502 ifa_flags &= IFA_F_MANAGETEMPADDR;
4503
4504 return inet6_addr_del(net, ifm->ifa_index, ifa_flags, pfx,
4505 ifm->ifa_prefixlen);
1da177e4
LT		 4506}
4507
479840ff 4508static int inet6_addr_modify(struct inet6_ifaddr *ifp, u32 ifa_flags,
55ebaef1 4509 u32 prefered_lft, u32 valid_lft)
081bba5b 4510{
6f704992
YH		 4511 u32 flags;
4512 clock_t expires;
4bed72e4 4513 unsigned long timeout;
53bd6749 4514 bool was_managetempaddr;
5b84efec 4515 bool had_prefixroute;
46d48046 4516
c15b1cca
HFS		 4517 ASSERT_RTNL();
4518
081bba5b
NT		 4519 if (!valid_lft || (prefered_lft > valid_lft))
4520 return -EINVAL;
4521
53bd6749
JP		 4522 if (ifa_flags & IFA_F_MANAGETEMPADDR &&
4523 (ifp->flags & IFA_F_TEMPORARY || ifp->prefix_len != 64))
4524 return -EINVAL;
4525
f1c02cfb
SD		 4526 if (!(ifp->flags & IFA_F_TENTATIVE) || ifp->flags & IFA_F_DADFAILED)
4527 ifa_flags &= ~IFA_F_OPTIMISTIC;
4528
4bed72e4
YH		 4529 timeout = addrconf_timeout_fixup(valid_lft, HZ);
4530 if (addrconf_finite_timeout(timeout)) {
4531 expires = jiffies_to_clock_t(timeout * HZ);
4532 valid_lft = timeout;
6f704992 4533 flags = RTF_EXPIRES;
4bed72e4
YH		 4534 } else {
4535 expires = 0;
4536 flags = 0;
4537 ifa_flags |= IFA_F_PERMANENT;
6f704992 4538 }
081bba5b 4539
4bed72e4
YH		 4540 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
4541 if (addrconf_finite_timeout(timeout)) {
4542 if (timeout == 0)
4543 ifa_flags |= IFA_F_DEPRECATED;
4544 prefered_lft = timeout;
4545 }
081bba5b
NT		 4546
4547 spin_lock_bh(&ifp->lock);
53bd6749 4548 was_managetempaddr = ifp->flags & IFA_F_MANAGETEMPADDR;
5b84efec
TH		 4549 had_prefixroute = ifp->flags & IFA_F_PERMANENT &&
4550 !(ifp->flags & IFA_F_NOPREFIXROUTE);
53bd6749 4551 ifp->flags &= ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD |
761aac73
TH		 4552 IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
4553 IFA_F_NOPREFIXROUTE);
53bd6749 4554 ifp->flags |= ifa_flags;
081bba5b
NT		 4555 ifp->tstamp = jiffies;
4556 ifp->valid_lft = valid_lft;
4557 ifp->prefered_lft = prefered_lft;
4558
4559 spin_unlock_bh(&ifp->lock);
4560 if (!(ifp->flags&IFA_F_TENTATIVE))
4561 ipv6_ifa_notify(0, ifp);
081bba5b 4562
761aac73
TH		 4563 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) {
4564 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
4565 expires, flags);
5b84efec
TH		 4566 } else if (had_prefixroute) {
4567 enum cleanup_prefix_rt_t action;
4568 unsigned long rt_expires;
4569
4570 write_lock_bh(&ifp->idev->lock);
4571 action = check_cleanup_prefix_route(ifp, &rt_expires);
4572 write_unlock_bh(&ifp->idev->lock);
4573
4574 if (action != CLEANUP_PREFIX_RT_NOP) {
4575 cleanup_prefix_route(ifp, rt_expires,
4576 action == CLEANUP_PREFIX_RT_DEL);
4577 }
761aac73 4578 }
53bd6749
JP		 4579
4580 if (was_managetempaddr || ifp->flags & IFA_F_MANAGETEMPADDR) {
4581 if (was_managetempaddr && !(ifp->flags & IFA_F_MANAGETEMPADDR))
4582 valid_lft = prefered_lft = 0;
4583 manage_tempaddrs(ifp->idev, ifp, valid_lft, prefered_lft,
4584 !was_managetempaddr, jiffies);
4585 }
4586
c15b1cca 4587 addrconf_verify_rtnl();
081bba5b
NT		 4588
4589 return 0;
4590}
4591
1da177e4 4592static int
c21ef3e3
DA		 4593inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh,
4594 struct netlink_ext_ack *extack)
1da177e4 4595{
3b1e0a65 4596 struct net *net = sock_net(skb->sk);
461d8837
TG		 4597 struct ifaddrmsg *ifm;
4598 struct nlattr *tb[IFA_MAX+1];
caeaba79 4599 struct in6_addr *pfx, *peer_pfx;
7198f8ce
TG		 4600 struct inet6_ifaddr *ifa;
4601 struct net_device *dev;
f1c02cfb 4602 struct inet6_dev *idev;
55ebaef1 4603 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
479840ff 4604 u32 ifa_flags;
461d8837 4605 int err;
1da177e4 4606
fceb6435 4607 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy,
c21ef3e3 4608 extack);
461d8837
TG		 4609 if (err < 0)
4610 return err;
4611
4612 ifm = nlmsg_data(nlh);
caeaba79 4613 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
63159f29 4614 if (!pfx)
1da177e4
LT		 4615 return -EINVAL;
4616
461d8837 4617 if (tb[IFA_CACHEINFO]) {
0778769d 4618 struct ifa_cacheinfo *ci;
461d8837
TG		 4619
4620 ci = nla_data(tb[IFA_CACHEINFO]);
0778769d 4621 valid_lft = ci->ifa_valid;
461d8837
TG		 4622 preferred_lft = ci->ifa_prefered;
4623 } else {
4624 preferred_lft = INFINITY_LIFE_TIME;
4625 valid_lft = INFINITY_LIFE_TIME;
0778769d
NT		 4626 }
4627
af284937 4628 dev = __dev_get_by_index(net, ifm->ifa_index);
63159f29 4629 if (!dev)
7198f8ce
TG		 4630 return -ENODEV;
4631
479840ff
JP		 4632 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
4633
55ebaef1 4634 /* We ignore other flags so far. */
761aac73 4635 ifa_flags &= IFA_F_NODAD | IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
f1c02cfb
SD		 4636 IFA_F_NOPREFIXROUTE | IFA_F_MCAUTOJOIN | IFA_F_OPTIMISTIC;
4637
4638 idev = ipv6_find_idev(dev);
4639 if (IS_ERR(idev))
4640 return PTR_ERR(idev);
4641
4642 if (!ipv6_allow_optimistic_dad(net, idev))
4643 ifa_flags &= ~IFA_F_OPTIMISTIC;
4644
4645 if (ifa_flags & IFA_F_NODAD && ifa_flags & IFA_F_OPTIMISTIC) {
4646 NL_SET_ERR_MSG(extack, "IFA_F_NODAD and IFA_F_OPTIMISTIC are mutually exclusive");
4647 return -EINVAL;
4648 }
55ebaef1 4649
1cab3da6 4650 ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
63159f29 4651 if (!ifa) {
7198f8ce
TG		 4652 /*
4653 * It would be best to check for !NLM_F_CREATE here but
db9c7c39 4654 * userspace already relies on not having to provide this.
7198f8ce 4655 */
caeaba79 4656 return inet6_addr_add(net, ifm->ifa_index, pfx, peer_pfx,
af284937 4657 ifm->ifa_prefixlen, ifa_flags,
de95e047 4658 preferred_lft, valid_lft, extack);
081bba5b
NT		 4659 }
4660
7198f8ce
TG		 4661 if (nlh->nlmsg_flags & NLM_F_EXCL ||
4662 !(nlh->nlmsg_flags & NLM_F_REPLACE))
4663 err = -EEXIST;
4664 else
55ebaef1 4665 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
7198f8ce
TG		 4666
4667 in6_ifa_put(ifa);
4668
4669 return err;
1da177e4
LT		 4670}
4671
479840ff 4672static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u32 flags,
101bb229
TG		 4673 u8 scope, int ifindex)
4674{
4675 struct ifaddrmsg *ifm;
4676
4677 ifm = nlmsg_data(nlh);
4678 ifm->ifa_family = AF_INET6;
4679 ifm->ifa_prefixlen = prefixlen;
4680 ifm->ifa_flags = flags;
4681 ifm->ifa_scope = scope;
4682 ifm->ifa_index = ifindex;
4683}
4684
85486af0
TG		 4685static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
4686 unsigned long tstamp, u32 preferred, u32 valid)
4687{
4688 struct ifa_cacheinfo ci;
4689
18a31e1e
TG		 4690 ci.cstamp = cstamp_delta(cstamp);
4691 ci.tstamp = cstamp_delta(tstamp);
85486af0
TG		 4692 ci.ifa_prefered = preferred;
4693 ci.ifa_valid = valid;
4694
4695 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
4696}
4697
101bb229
TG		 4698static inline int rt_scope(int ifa_scope)
4699{
4700 if (ifa_scope & IFA_HOST)
4701 return RT_SCOPE_HOST;
4702 else if (ifa_scope & IFA_LINK)
4703 return RT_SCOPE_LINK;
4704 else if (ifa_scope & IFA_SITE)
4705 return RT_SCOPE_SITE;
4706 else
4707 return RT_SCOPE_UNIVERSE;
4708}
4709
0ab6803b
TG		 4710static inline int inet6_ifaddr_msgsize(void)
4711{
339bf98f 4712 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
caeaba79 4713 + nla_total_size(16) /* IFA_LOCAL */
339bf98f 4714 + nla_total_size(16) /* IFA_ADDRESS */
479840ff
JP		 4715 + nla_total_size(sizeof(struct ifa_cacheinfo))
4716 + nla_total_size(4) /* IFA_FLAGS */;
0ab6803b 4717}
c5396a31 4718
1da177e4 4719static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
15e47304 4720 u32 portid, u32 seq, int event, unsigned int flags)
1da177e4 4721{
1da177e4 4722 struct nlmsghdr *nlh;
85486af0 4723 u32 preferred, valid;
1da177e4 4724
15e47304 4725 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
63159f29 4726 if (!nlh)
26932566 4727 return -EMSGSIZE;
0ab6803b 4728
101bb229
TG		 4729 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
4730 ifa->idev->dev->ifindex);
4731
fad8da3e
YA		 4732 if (!((ifa->flags&IFA_F_PERMANENT) &&
4733 (ifa->prefered_lft == INFINITY_LIFE_TIME))) {
85486af0
TG		 4734 preferred = ifa->prefered_lft;
4735 valid = ifa->valid_lft;
4736 if (preferred != INFINITY_LIFE_TIME) {
1da177e4 4737 long tval = (jiffies - ifa->tstamp)/HZ;
a1faa698
JR		 4738 if (preferred > tval)
4739 preferred -= tval;
4740 else
4741 preferred = 0;
f56619fc
BH		 4742 if (valid != INFINITY_LIFE_TIME) {
4743 if (valid > tval)
4744 valid -= tval;
4745 else
4746 valid = 0;
4747 }
1da177e4
LT		 4748 }
4749 } else {
85486af0
TG		 4750 preferred = INFINITY_LIFE_TIME;
4751 valid = INFINITY_LIFE_TIME;
4752 }
4753
7996c799 4754 if (!ipv6_addr_any(&ifa->peer_addr)) {
930345ea
JB		 4755 if (nla_put_in6_addr(skb, IFA_LOCAL, &ifa->addr) < 0 ||
4756 nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->peer_addr) < 0)
caeaba79
ND		 4757 goto error;
4758 } else
930345ea 4759 if (nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->addr) < 0)
caeaba79
ND		 4760 goto error;
4761
4762 if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0)
4763 goto error;
1da177e4 4764
479840ff
JP		 4765 if (nla_put_u32(skb, IFA_FLAGS, ifa->flags) < 0)
4766 goto error;
4767
053c095a
JB		 4768 nlmsg_end(skb, nlh);
4769 return 0;
caeaba79
ND		 4770
4771error:
4772 nlmsg_cancel(skb, nlh);
4773 return -EMSGSIZE;
1da177e4
LT		 4774}
4775
4776static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
15e47304 4777 u32 portid, u32 seq, int event, u16 flags)
1da177e4 4778{
1da177e4 4779 struct nlmsghdr *nlh;
101bb229
TG		 4780 u8 scope = RT_SCOPE_UNIVERSE;
4781 int ifindex = ifmca->idev->dev->ifindex;
4782
4783 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
4784 scope = RT_SCOPE_SITE;
1da177e4 4785
15e47304 4786 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
63159f29 4787 if (!nlh)
26932566 4788 return -EMSGSIZE;
85486af0 4789
0ab6803b 4790 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
930345ea 4791 if (nla_put_in6_addr(skb, IFA_MULTICAST, &ifmca->mca_addr) < 0 ||
0ab6803b 4792 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
26932566
PM		 4793 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
4794 nlmsg_cancel(skb, nlh);
4795 return -EMSGSIZE;
4796 }
85486af0 4797
053c095a
JB		 4798 nlmsg_end(skb, nlh);
4799 return 0;
1da177e4
LT		 4800}
4801
4802static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
15e47304 4803 u32 portid, u32 seq, int event, unsigned int flags)
1da177e4 4804{
1da177e4 4805 struct nlmsghdr *nlh;
101bb229
TG		 4806 u8 scope = RT_SCOPE_UNIVERSE;
4807 int ifindex = ifaca->aca_idev->dev->ifindex;
4808
4809 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
4810 scope = RT_SCOPE_SITE;
1da177e4 4811
15e47304 4812 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
63159f29 4813 if (!nlh)
26932566 4814 return -EMSGSIZE;
85486af0 4815
0ab6803b 4816 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
930345ea 4817 if (nla_put_in6_addr(skb, IFA_ANYCAST, &ifaca->aca_addr) < 0 ||
0ab6803b 4818 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
26932566
PM		 4819 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
4820 nlmsg_cancel(skb, nlh);
4821 return -EMSGSIZE;
4822 }
1da177e4 4823
053c095a
JB		 4824 nlmsg_end(skb, nlh);
4825 return 0;
1da177e4
LT		 4826}
4827
e21e8467 4828enum addr_type_t {
1da177e4
LT		 4829 UNICAST_ADDR,
4830 MULTICAST_ADDR,
4831 ANYCAST_ADDR,
4832};
4833
234b27c3
ED		 4834/* called with rcu_read_lock() */
4835static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
4836 struct netlink_callback *cb, enum addr_type_t type,
4837 int s_ip_idx, int *p_ip_idx)
4838{
234b27c3
ED		 4839 struct ifmcaddr6 *ifmca;
4840 struct ifacaddr6 *ifaca;
4841 int err = 1;
4842 int ip_idx = *p_ip_idx;
4843
4844 read_lock_bh(&idev->lock);
4845 switch (type) {
502a2ffd 4846 case UNICAST_ADDR: {
4847 struct inet6_ifaddr *ifa;
4848
234b27c3 4849 /* unicast address incl. temp addr */
502a2ffd 4850 list_for_each_entry(ifa, &idev->addr_list, if_list) {
4851 if (++ip_idx < s_ip_idx)
234b27c3
ED		 4852 continue;
4853 err = inet6_fill_ifaddr(skb, ifa,
15e47304 4854 NETLINK_CB(cb->skb).portid,
234b27c3
ED		 4855 cb->nlh->nlmsg_seq,
4856 RTM_NEWADDR,
4857 NLM_F_MULTI);
053c095a 4858 if (err < 0)
234b27c3 4859 break;
63998ac2 4860 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
234b27c3
ED		 4861 }
4862 break;
502a2ffd 4863 }
234b27c3
ED		 4864 case MULTICAST_ADDR:
4865 /* multicast address */
4866 for (ifmca = idev->mc_list; ifmca;
4867 ifmca = ifmca->next, ip_idx++) {
4868 if (ip_idx < s_ip_idx)
4869 continue;
4870 err = inet6_fill_ifmcaddr(skb, ifmca,
15e47304 4871 NETLINK_CB(cb->skb).portid,
234b27c3
ED		 4872 cb->nlh->nlmsg_seq,
4873 RTM_GETMULTICAST,
4874 NLM_F_MULTI);
053c095a 4875 if (err < 0)
234b27c3
ED		 4876 break;
4877 }
4878 break;
4879 case ANYCAST_ADDR:
4880 /* anycast address */
4881 for (ifaca = idev->ac_list; ifaca;
4882 ifaca = ifaca->aca_next, ip_idx++) {
4883 if (ip_idx < s_ip_idx)
4884 continue;
4885 err = inet6_fill_ifacaddr(skb, ifaca,
15e47304 4886 NETLINK_CB(cb->skb).portid,
234b27c3
ED		 4887 cb->nlh->nlmsg_seq,
4888 RTM_GETANYCAST,
4889 NLM_F_MULTI);
053c095a 4890 if (err < 0)
234b27c3
ED		 4891 break;
4892 }
4893 break;
4894 default:
4895 break;
4896 }
4897 read_unlock_bh(&idev->lock);
4898 *p_ip_idx = ip_idx;
4899 return err;
4900}
4901
1da177e4
LT		 4902static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
4903 enum addr_type_t type)
4904{
234b27c3
ED		 4905 struct net *net = sock_net(skb->sk);
4906 int h, s_h;
1da177e4
LT		 4907 int idx, ip_idx;
4908 int s_idx, s_ip_idx;
1da177e4 4909 struct net_device *dev;
234b27c3
ED		 4910 struct inet6_dev *idev;
4911 struct hlist_head *head;
1ab1457c 4912
234b27c3
ED		 4913 s_h = cb->args[0];
4914 s_idx = idx = cb->args[1];
4915 s_ip_idx = ip_idx = cb->args[2];
5d5619b4 4916
234b27c3 4917 rcu_read_lock();
63998ac2 4918 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ net->dev_base_seq;
234b27c3
ED		 4919 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4920 idx = 0;
4921 head = &net->dev_index_head[h];
b67bfe0d 4922 hlist_for_each_entry_rcu(dev, head, index_hlist) {
234b27c3
ED		 4923 if (idx < s_idx)
4924 goto cont;
4b97efdf 4925 if (h > s_h || idx > s_idx)
234b27c3
ED		 4926 s_ip_idx = 0;
4927 ip_idx = 0;
e21e8467
SH		 4928 idev = __in6_dev_get(dev);
4929 if (!idev)
234b27c3
ED		 4930 goto cont;
4931
4932 if (in6_dump_addrs(idev, skb, cb, type,
7b46a644 4933 s_ip_idx, &ip_idx) < 0)
234b27c3 4934 goto done;
7562f876 4935cont:
234b27c3
ED		 4936 idx++;
4937 }
1da177e4 4938 }
234b27c3
ED		 4939done:
4940 rcu_read_unlock();
4941 cb->args[0] = h;
4942 cb->args[1] = idx;
4943 cb->args[2] = ip_idx;
4944
1da177e4
LT		 4945 return skb->len;
4946}
4947
4948static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
4949{
4950 enum addr_type_t type = UNICAST_ADDR;
b854272b 4951
1da177e4
LT		 4952 return inet6_dump_addr(skb, cb, type);
4953}
4954
4955static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
4956{
4957 enum addr_type_t type = MULTICAST_ADDR;
b854272b 4958
1da177e4
LT		 4959 return inet6_dump_addr(skb, cb, type);
4960}
4961
4962
4963static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
4964{
4965 enum addr_type_t type = ANYCAST_ADDR;
b854272b 4966
1da177e4
LT		 4967 return inet6_dump_addr(skb, cb, type);
4968}
4969
c21ef3e3
DA		 4970static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh,
4971 struct netlink_ext_ack *extack)
6c223828 4972{
3b1e0a65 4973 struct net *net = sock_net(in_skb->sk);
1b29fc2c
TG		 4974 struct ifaddrmsg *ifm;
4975 struct nlattr *tb[IFA_MAX+1];
caeaba79 4976 struct in6_addr *addr = NULL, *peer;
6c223828
NT		 4977 struct net_device *dev = NULL;
4978 struct inet6_ifaddr *ifa;
4979 struct sk_buff *skb;
6c223828
NT		 4980 int err;
4981
fceb6435 4982 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy,
c21ef3e3 4983 extack);
1b29fc2c 4984 if (err < 0)
c24675f8 4985 return err;
1b29fc2c 4986
caeaba79 4987 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer);
c24675f8
FW		 4988 if (!addr)
4989 return -EINVAL;
6c223828 4990
1b29fc2c 4991 ifm = nlmsg_data(nlh);
6c223828 4992 if (ifm->ifa_index)
c24675f8 4993 dev = dev_get_by_index(net, ifm->ifa_index);
6c223828 4994
e21e8467
SH		 4995 ifa = ipv6_get_ifaddr(net, addr, dev, 1);
4996 if (!ifa) {
1b29fc2c
TG		 4997 err = -EADDRNOTAVAIL;
4998 goto errout;
4999 }
6c223828 5000
e21e8467
SH		 5001 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
5002 if (!skb) {
6c223828 5003 err = -ENOBUFS;
1b29fc2c 5004 goto errout_ifa;
6c223828
NT		 5005 }
5006
15e47304 5007 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).portid,
6c223828 5008 nlh->nlmsg_seq, RTM_NEWADDR, 0);
26932566
PM		 5009 if (err < 0) {
5010 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
5011 WARN_ON(err == -EMSGSIZE);
5012 kfree_skb(skb);
5013 goto errout_ifa;
5014 }
15e47304 5015 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
1b29fc2c 5016errout_ifa:
6c223828 5017 in6_ifa_put(ifa);
1b29fc2c 5018errout:
c24675f8
FW		 5019 if (dev)
5020 dev_put(dev);
6c223828 5021 return err;
6c223828
NT		 5022}
5023
1da177e4
LT		 5024static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
5025{
5026 struct sk_buff *skb;
c346dca1 5027 struct net *net = dev_net(ifa->idev->dev);
5d620266 5028 int err = -ENOBUFS;
1da177e4 5029
f784ad3d
MB		 5030 /* Don't send DELADDR notification for TENTATIVE address,
5031 * since NEWADDR notification is sent only after removing
6819a14e 5032 * TENTATIVE flag, if DAD has not failed.
f784ad3d 5033 */
6819a14e
MM		 5034 if (ifa->flags & IFA_F_TENTATIVE && !(ifa->flags & IFA_F_DADFAILED) &&
5035 event == RTM_DELADDR)
f784ad3d
MB		 5036 return;
5037
0ab6803b 5038 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
63159f29 5039 if (!skb)
5d620266
TG		 5040 goto errout;
5041
5042 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
26932566
PM		 5043 if (err < 0) {
5044 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
5045 WARN_ON(err == -EMSGSIZE);
5046 kfree_skb(skb);
5047 goto errout;
5048 }
1ce85fe4
PNA		 5049 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
5050 return;
5d620266
TG		 5051errout:
5052 if (err < 0)
6fda7350 5053 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
1da177e4
LT		 5054}
5055
b6f99a21 5056static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
1da177e4
LT		 5057 __s32 *array, int bytes)
5058{
04561c1f
TG		 5059 BUG_ON(bytes < (DEVCONF_MAX * 4));
5060
1da177e4
LT		 5061 memset(array, 0, bytes);
5062 array[DEVCONF_FORWARDING] = cnf->forwarding;
5063 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
5064 array[DEVCONF_MTU6] = cnf->mtu6;
5065 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
5066 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
5067 array[DEVCONF_AUTOCONF] = cnf->autoconf;
5068 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
5069 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
93908d19
TG		 5070 array[DEVCONF_RTR_SOLICIT_INTERVAL] =
5071 jiffies_to_msecs(cnf->rtr_solicit_interval);
bd11f074
MŻ		 5072 array[DEVCONF_RTR_SOLICIT_MAX_INTERVAL] =
5073 jiffies_to_msecs(cnf->rtr_solicit_max_interval);
93908d19
TG		 5074 array[DEVCONF_RTR_SOLICIT_DELAY] =
5075 jiffies_to_msecs(cnf->rtr_solicit_delay);
1da177e4 5076 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
fc4eba58
HFS		 5077 array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] =
5078 jiffies_to_msecs(cnf->mldv1_unsolicited_report_interval);
5079 array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] =
5080 jiffies_to_msecs(cnf->mldv2_unsolicited_report_interval);
1da177e4
LT		 5081 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
5082 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
5083 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
5084 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
5085 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
1da177e4 5086 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
65f5c7c1 5087 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
8013d1d7 5088 array[DEVCONF_ACCEPT_RA_MIN_HOP_LIMIT] = cnf->accept_ra_min_hop_limit;
c4fd30eb 5089 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
930d6ff2
YH		 5090#ifdef CONFIG_IPV6_ROUTER_PREF
5091 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
93908d19
TG		 5092 array[DEVCONF_RTR_PROBE_INTERVAL] =
5093 jiffies_to_msecs(cnf->rtr_probe_interval);
fa03ef38 5094#ifdef CONFIG_IPV6_ROUTE_INFO
bbea124b 5095 array[DEVCONF_ACCEPT_RA_RT_INFO_MIN_PLEN] = cnf->accept_ra_rt_info_min_plen;
09c884d4
YH		 5096 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
5097#endif
930d6ff2 5098#endif
fbea49e1 5099 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
0bcbc926 5100 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
95c385b4
NH		 5101#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
5102 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
7fd2561e 5103 array[DEVCONF_USE_OPTIMISTIC] = cnf->use_optimistic;
95c385b4 5104#endif
7bc570c8
YH		 5105#ifdef CONFIG_IPV6_MROUTE
5106 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
5107#endif
778d80be 5108 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
1b34be74 5109 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
c3faca05 5110 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
5cb04436 5111 array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify;
b800c3b9 5112 array[DEVCONF_SUPPRESS_FRAG_NDISC] = cnf->suppress_frag_ndisc;
d9333196 5113 array[DEVCONF_ACCEPT_RA_FROM_LOCAL] = cnf->accept_ra_from_local;
c2943f14 5114 array[DEVCONF_ACCEPT_RA_MTU] = cnf->accept_ra_mtu;
35103d11 5115 array[DEVCONF_IGNORE_ROUTES_WITH_LINKDOWN] = cnf->ignore_routes_with_linkdown;
3d1bec99 5116 /* we omit DEVCONF_STABLE_SECRET for now */
3985e8a3 5117 array[DEVCONF_USE_OIF_ADDRS_ONLY] = cnf->use_oif_addrs_only;
abbc3043 5118 array[DEVCONF_DROP_UNICAST_IN_L2_MULTICAST] = cnf->drop_unicast_in_l2_multicast;
7a02bf89 5119 array[DEVCONF_DROP_UNSOLICITED_NA] = cnf->drop_unsolicited_na;
f1705ec1 5120 array[DEVCONF_KEEP_ADDR_ON_DOWN] = cnf->keep_addr_on_down;
1ababeba 5121 array[DEVCONF_SEG6_ENABLED] = cnf->seg6_enabled;
bf355b8d
DL		 5122#ifdef CONFIG_IPV6_SEG6_HMAC
5123 array[DEVCONF_SEG6_REQUIRE_HMAC] = cnf->seg6_require_hmac;
5124#endif
adc176c5 5125 array[DEVCONF_ENHANCED_DAD] = cnf->enhanced_dad;
d35a00b8 5126 array[DEVCONF_ADDR_GEN_MODE] = cnf->addr_gen_mode;
df789fe7 5127 array[DEVCONF_DISABLE_POLICY] = cnf->disable_policy;
2210d6b2 5128 array[DEVCONF_NDISC_TCLASS] = cnf->ndisc_tclass;
1da177e4
LT		 5129}
5130
b382b191
TG		 5131static inline size_t inet6_ifla6_size(void)
5132{
5133 return nla_total_size(4) /* IFLA_INET6_FLAGS */
5134 + nla_total_size(sizeof(struct ifla_cacheinfo))
5135 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
5136 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
f53adae4
DB		 5137 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
5138 + nla_total_size(sizeof(struct in6_addr)); /* IFLA_INET6_TOKEN */
b382b191
TG		 5139}
5140
339bf98f
TG		 5141static inline size_t inet6_if_nlmsg_size(void)
5142{
5143 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
5144 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
5145 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
5146 + nla_total_size(4) /* IFLA_MTU */
5147 + nla_total_size(4) /* IFLA_LINK */
0344338b 5148 + nla_total_size(1) /* IFLA_OPERSTATE */
b382b191 5149 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */
339bf98f 5150}
c5396a31 5151
be281e55 5152static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib,
aca05671 5153 int bytes)
7f7d9a6b
HX		 5154{
5155 int i;
aca05671 5156 int pad = bytes - sizeof(u64) * ICMP6_MIB_MAX;
7f7d9a6b
HX		 5157 BUG_ON(pad < 0);
5158
5159 /* Use put_unaligned() because stats may not be aligned for u64. */
aca05671
JH		 5160 put_unaligned(ICMP6_MIB_MAX, &stats[0]);
5161 for (i = 1; i < ICMP6_MIB_MAX; i++)
be281e55 5162 put_unaligned(atomic_long_read(&mib[i]), &stats[i]);
7f7d9a6b 5163
aca05671 5164 memset(&stats[ICMP6_MIB_MAX], 0, pad);
7f7d9a6b
HX		 5165}
5166
698365fa 5167static inline void __snmp6_fill_stats64(u64 *stats, void __percpu *mib,
a3a77372 5168 int bytes, size_t syncpoff)
4ce3c183 5169{
a3a77372
R		 5170 int i, c;
5171 u64 buff[IPSTATS_MIB_MAX];
5172 int pad = bytes - sizeof(u64) * IPSTATS_MIB_MAX;
5173
4ce3c183
ED		 5174 BUG_ON(pad < 0);
5175
a3a77372
R		 5176 memset(buff, 0, sizeof(buff));
5177 buff[0] = IPSTATS_MIB_MAX;
4ce3c183 5178
a3a77372
R		 5179 for_each_possible_cpu(c) {
5180 for (i = 1; i < IPSTATS_MIB_MAX; i++)
5181 buff[i] += snmp_get_cpu_field64(mib, c, i, syncpoff);
5182 }
5183
5184 memcpy(stats, buff, IPSTATS_MIB_MAX * sizeof(u64));
5185 memset(&stats[IPSTATS_MIB_MAX], 0, pad);
4ce3c183
ED		 5186}
5187
7f7d9a6b
HX		 5188static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
5189 int bytes)
5190{
e21e8467 5191 switch (attrtype) {
7f7d9a6b 5192 case IFLA_INET6_STATS:
a3a77372
R		 5193 __snmp6_fill_stats64(stats, idev->stats.ipv6, bytes,
5194 offsetof(struct ipstats_mib, syncp));
7f7d9a6b
HX		 5195 break;
5196 case IFLA_INET6_ICMP6STATS:
aca05671 5197 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, bytes);
7f7d9a6b
HX		 5198 break;
5199 }
5200}
5201
d5566fd7
SV		 5202static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev,
5203 u32 ext_filter_mask)
b382b191
TG		 5204{
5205 struct nlattr *nla;
5206 struct ifla_cacheinfo ci;
5207
c78679e8
DM		 5208 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags))
5209 goto nla_put_failure;
b382b191 5210 ci.max_reasm_len = IPV6_MAXPLEN;
24912420
DM		 5211 ci.tstamp = cstamp_delta(idev->tstamp);
5212 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time);
1f9248e5 5213 ci.retrans_time = jiffies_to_msecs(NEIGH_VAR(idev->nd_parms, RETRANS_TIME));
c78679e8
DM		 5214 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci))
5215 goto nla_put_failure;
b382b191 5216 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
63159f29 5217 if (!nla)
b382b191
TG		 5218 goto nla_put_failure;
5219 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
5220
5221 /* XXX - MC not implemented */
5222
d5566fd7
SV		 5223 if (ext_filter_mask & RTEXT_FILTER_SKIP_STATS)
5224 return 0;
5225
b382b191 5226 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
63159f29 5227 if (!nla)
b382b191
TG		 5228 goto nla_put_failure;
5229 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
5230
5231 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
63159f29 5232 if (!nla)
b382b191
TG		 5233 goto nla_put_failure;
5234 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
5235
f53adae4 5236 nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr));
63159f29 5237 if (!nla)
f53adae4 5238 goto nla_put_failure;
bc91b0f0 5239
d35a00b8 5240 if (nla_put_u8(skb, IFLA_INET6_ADDR_GEN_MODE, idev->cnf.addr_gen_mode))
bc91b0f0
JP		 5241 goto nla_put_failure;
5242
f53adae4
DB		 5243 read_lock_bh(&idev->lock);
5244 memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla));
5245 read_unlock_bh(&idev->lock);
5246
b382b191
TG		 5247 return 0;
5248
5249nla_put_failure:
5250 return -EMSGSIZE;
5251}
5252
b1974ed0
AR		 5253static size_t inet6_get_link_af_size(const struct net_device *dev,
5254 u32 ext_filter_mask)
b382b191
TG		 5255{
5256 if (!__in6_dev_get(dev))
5257 return 0;
5258
5259 return inet6_ifla6_size();
5260}
5261
d5566fd7
SV		 5262static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev,
5263 u32 ext_filter_mask)
b382b191
TG		 5264{
5265 struct inet6_dev *idev = __in6_dev_get(dev);
5266
5267 if (!idev)
5268 return -ENODATA;
5269
d5566fd7 5270 if (inet6_fill_ifla6_attrs(skb, idev, ext_filter_mask) < 0)
b382b191
TG		 5271 return -EMSGSIZE;
5272
5273 return 0;
5274}
5275
f53adae4
DB		 5276static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token)
5277{
f53adae4
DB		 5278 struct inet6_ifaddr *ifp;
5279 struct net_device *dev = idev->dev;
47e27d5e 5280 bool clear_token, update_rs = false;
dc848292 5281 struct in6_addr ll_addr;
f53adae4 5282
c15b1cca
HFS		 5283 ASSERT_RTNL();
5284
63159f29 5285 if (!token)
f53adae4 5286 return -EINVAL;
f53adae4
DB		 5287 if (dev->flags & (IFF_LOOPBACK | IFF_NOARP))
5288 return -EINVAL;
f53adae4
DB		 5289 if (!ipv6_accept_ra(idev))
5290 return -EINVAL;
bd11f074 5291 if (idev->cnf.rtr_solicits == 0)
f53adae4
DB		 5292 return -EINVAL;
5293
5294 write_lock_bh(&idev->lock);
5295
5296 BUILD_BUG_ON(sizeof(token->s6_addr) != 16);
5297 memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8);
5298
5299 write_unlock_bh(&idev->lock);
5300
47e27d5e
DB		 5301 clear_token = ipv6_addr_any(token);
5302 if (clear_token)
5303 goto update_lft;
5304
dc848292
HFS		 5305 if (!idev->dead && (idev->if_flags & IF_READY) &&
5306 !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE |
5307 IFA_F_OPTIMISTIC)) {
fc403832
DB		 5308 /* If we're not ready, then normal ifup will take care
5309 * of this. Otherwise, we need to request our rs here.
5310 */
5311 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters);
5312 update_rs = true;
5313 }
f53adae4 5314
47e27d5e 5315update_lft:
f53adae4 5316 write_lock_bh(&idev->lock);
fc403832 5317
77ecaace 5318 if (update_rs) {
fc403832 5319 idev->if_flags |= IF_RS_SENT;
bd11f074
MŻ		 5320 idev->rs_interval = rfc3315_s14_backoff_init(
5321 idev->cnf.rtr_solicit_interval);
77ecaace 5322 idev->rs_probes = 1;
bd11f074 5323 addrconf_mod_rs_timer(idev, idev->rs_interval);
77ecaace 5324 }
f53adae4
DB		 5325
5326 /* Well, that's kinda nasty ... */
5327 list_for_each_entry(ifp, &idev->addr_list, if_list) {
5328 spin_lock(&ifp->lock);
617fe29d 5329 if (ifp->tokenized) {
f53adae4
DB		 5330 ifp->valid_lft = 0;
5331 ifp->prefered_lft = 0;
5332 }
5333 spin_unlock(&ifp->lock);
5334 }
5335
5336 write_unlock_bh(&idev->lock);
b2ed64a9 5337 inet6_ifinfo_notify(RTM_NEWLINK, idev);
c15b1cca 5338 addrconf_verify_rtnl();
f53adae4
DB		 5339 return 0;
5340}
5341
11b1f828
DB		 5342static const struct nla_policy inet6_af_policy[IFLA_INET6_MAX + 1] = {
5343 [IFLA_INET6_ADDR_GEN_MODE] = { .type = NLA_U8 },
5344 [IFLA_INET6_TOKEN] = { .len = sizeof(struct in6_addr) },
5345};
5346
5347static int inet6_validate_link_af(const struct net_device *dev,
5348 const struct nlattr *nla)
5349{
5350 struct nlattr *tb[IFLA_INET6_MAX + 1];
5351
5352 if (dev && !__in6_dev_get(dev))
5353 return -EAFNOSUPPORT;
5354
fceb6435
JB		 5355 return nla_parse_nested(tb, IFLA_INET6_MAX, nla, inet6_af_policy,
5356 NULL);
11b1f828
DB		 5357}
5358
d35a00b8
FJ		 5359static int check_addr_gen_mode(int mode)
5360{
5361 if (mode != IN6_ADDR_GEN_MODE_EUI64 &&
5362 mode != IN6_ADDR_GEN_MODE_NONE &&
5363 mode != IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
5364 mode != IN6_ADDR_GEN_MODE_RANDOM)
5365 return -EINVAL;
5366 return 1;
5367}
5368
5369static int check_stable_privacy(struct inet6_dev *idev, struct net *net,
5370 int mode)
5371{
5372 if (mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
5373 !idev->cnf.stable_secret.initialized &&
5374 !net->ipv6.devconf_dflt->stable_secret.initialized)
5375 return -EINVAL;
5376 return 1;
5377}
5378
f53adae4
DB		 5379static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla)
5380{
5381 int err = -EINVAL;
5382 struct inet6_dev *idev = __in6_dev_get(dev);
5383 struct nlattr *tb[IFLA_INET6_MAX + 1];
5384
5385 if (!idev)
5386 return -EAFNOSUPPORT;
5387
fceb6435 5388 if (nla_parse_nested(tb, IFLA_INET6_MAX, nla, NULL, NULL) < 0)
f53adae4
DB		 5389 BUG();
5390
bc91b0f0 5391 if (tb[IFLA_INET6_TOKEN]) {
f53adae4 5392 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN]));
bc91b0f0
JP		 5393 if (err)
5394 return err;
5395 }
5396
5397 if (tb[IFLA_INET6_ADDR_GEN_MODE]) {
5398 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]);
5399
d35a00b8
FJ		 5400 if (check_addr_gen_mode(mode) < 0 ||
5401 check_stable_privacy(idev, dev_net(dev), mode) < 0)
bc91b0f0 5402 return -EINVAL;
622c81d5 5403
d35a00b8 5404 idev->cnf.addr_gen_mode = mode;
bc91b0f0
JP		 5405 err = 0;
5406 }
f53adae4
DB		 5407
5408 return err;
5409}
5410
1ab1457c 5411static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
15e47304 5412 u32 portid, u32 seq, int event, unsigned int flags)
1da177e4 5413{
04561c1f 5414 struct net_device *dev = idev->dev;
04561c1f
TG		 5415 struct ifinfomsg *hdr;
5416 struct nlmsghdr *nlh;
5417 void *protoinfo;
04561c1f 5418
15e47304 5419 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags);
63159f29 5420 if (!nlh)
26932566 5421 return -EMSGSIZE;
04561c1f
TG		 5422
5423 hdr = nlmsg_data(nlh);
5424 hdr->ifi_family = AF_INET6;
5425 hdr->__ifi_pad = 0;
5426 hdr->ifi_type = dev->type;
5427 hdr->ifi_index = dev->ifindex;
5428 hdr->ifi_flags = dev_get_flags(dev);
5429 hdr->ifi_change = 0;
5430
c78679e8
DM		 5431 if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
5432 (dev->addr_len &&
5433 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
5434 nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
a54acb3a 5435 (dev->ifindex != dev_get_iflink(dev) &&
0344338b
AG		 5436 nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))) ||
5437 nla_put_u8(skb, IFLA_OPERSTATE,
5438 netif_running(dev) ? dev->operstate : IF_OPER_DOWN))
c78679e8 5439 goto nla_put_failure;
04561c1f 5440 protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
63159f29 5441 if (!protoinfo)
04561c1f 5442 goto nla_put_failure;
1da177e4 5443
d5566fd7 5444 if (inet6_fill_ifla6_attrs(skb, idev, 0) < 0)
bf99f1bd 5445 goto nla_put_failure;
1da177e4 5446
04561c1f 5447 nla_nest_end(skb, protoinfo);
053c095a
JB		 5448 nlmsg_end(skb, nlh);
5449 return 0;
1da177e4 5450
04561c1f 5451nla_put_failure:
26932566
PM		 5452 nlmsg_cancel(skb, nlh);
5453 return -EMSGSIZE;
1da177e4
LT		 5454}
5455
5456static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
5457{
3b1e0a65 5458 struct net *net = sock_net(skb->sk);
84d2697d 5459 int h, s_h;
434a8a58 5460 int idx = 0, s_idx;
1da177e4
LT		 5461 struct net_device *dev;
5462 struct inet6_dev *idev;
84d2697d 5463 struct hlist_head *head;
1da177e4 5464
84d2697d
ED		 5465 s_h = cb->args[0];
5466 s_idx = cb->args[1];
5467
5468 rcu_read_lock();
5469 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
5470 idx = 0;
5471 head = &net->dev_index_head[h];
b67bfe0d 5472 hlist_for_each_entry_rcu(dev, head, index_hlist) {
84d2697d
ED		 5473 if (idx < s_idx)
5474 goto cont;
5475 idev = __in6_dev_get(dev);
5476 if (!idev)
5477 goto cont;
5478 if (inet6_fill_ifinfo(skb, idev,
15e47304 5479 NETLINK_CB(cb->skb).portid,
84d2697d 5480 cb->nlh->nlmsg_seq,
053c095a 5481 RTM_NEWLINK, NLM_F_MULTI) < 0)
84d2697d 5482 goto out;
7562f876 5483cont:
84d2697d
ED		 5484 idx++;
5485 }
1da177e4 5486 }
84d2697d
ED		 5487out:
5488 rcu_read_unlock();
5489 cb->args[1] = idx;
5490 cb->args[0] = h;
1da177e4
LT		 5491
5492 return skb->len;
5493}
5494
5495void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
5496{
5497 struct sk_buff *skb;
c346dca1 5498 struct net *net = dev_net(idev->dev);
8d7a76c9 5499 int err = -ENOBUFS;
1ab1457c 5500
339bf98f 5501 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
63159f29 5502 if (!skb)
8d7a76c9
TG		 5503 goto errout;
5504
5505 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
26932566
PM		 5506 if (err < 0) {
5507 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
5508 WARN_ON(err == -EMSGSIZE);
5509 kfree_skb(skb);
5510 goto errout;
5511 }
5f75a104 5512 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC);
1ce85fe4 5513 return;
8d7a76c9
TG		 5514errout:
5515 if (err < 0)
5f75a104 5516 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err);
1da177e4
LT		 5517}
5518
339bf98f
TG		 5519static inline size_t inet6_prefix_nlmsg_size(void)
5520{
5521 return NLMSG_ALIGN(sizeof(struct prefixmsg))
5522 + nla_total_size(sizeof(struct in6_addr))
5523 + nla_total_size(sizeof(struct prefix_cacheinfo));
5524}
c5396a31 5525
1da177e4 5526static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
15e47304 5527 struct prefix_info *pinfo, u32 portid, u32 seq,
6051e2f4 5528 int event, unsigned int flags)
1da177e4 5529{
6051e2f4
TG		 5530 struct prefixmsg *pmsg;
5531 struct nlmsghdr *nlh;
1da177e4
LT		 5532 struct prefix_cacheinfo ci;
5533
15e47304 5534 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags);
63159f29 5535 if (!nlh)
26932566 5536 return -EMSGSIZE;
6051e2f4
TG		 5537
5538 pmsg = nlmsg_data(nlh);
1da177e4 5539 pmsg->prefix_family = AF_INET6;
8a47077a
PM		 5540 pmsg->prefix_pad1 = 0;
5541 pmsg->prefix_pad2 = 0;
1da177e4
LT		 5542 pmsg->prefix_ifindex = idev->dev->ifindex;
5543 pmsg->prefix_len = pinfo->prefix_len;
5544 pmsg->prefix_type = pinfo->type;
8a47077a 5545 pmsg->prefix_pad3 = 0;
1da177e4
LT		 5546 pmsg->prefix_flags = 0;
5547 if (pinfo->onlink)
5548 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
5549 if (pinfo->autoconf)
5550 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
5551
c78679e8
DM		 5552 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix))
5553 goto nla_put_failure;
1da177e4
LT		 5554 ci.preferred_time = ntohl(pinfo->prefered);
5555 ci.valid_time = ntohl(pinfo->valid);
c78679e8
DM		 5556 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci))
5557 goto nla_put_failure;
053c095a
JB		 5558 nlmsg_end(skb, nlh);
5559 return 0;
1da177e4 5560
6051e2f4 5561nla_put_failure:
26932566
PM		 5562 nlmsg_cancel(skb, nlh);
5563 return -EMSGSIZE;
1da177e4
LT		 5564}
5565
1ab1457c 5566static void inet6_prefix_notify(int event, struct inet6_dev *idev,
1da177e4
LT		 5567 struct prefix_info *pinfo)
5568{
5569 struct sk_buff *skb;
c346dca1 5570 struct net *net = dev_net(idev->dev);
8c384bfa 5571 int err = -ENOBUFS;
1da177e4 5572
339bf98f 5573 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
63159f29 5574 if (!skb)
8c384bfa
TG		 5575 goto errout;
5576
5577 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
26932566
PM		 5578 if (err < 0) {
5579 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
5580 WARN_ON(err == -EMSGSIZE);
5581 kfree_skb(skb);
5582 goto errout;
5583 }
1ce85fe4
PNA		 5584 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
5585 return;
8c384bfa
TG		 5586errout:
5587 if (err < 0)
6fda7350 5588 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
1da177e4
LT		 5589}
5590
1da177e4
LT		 5591static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
5592{
63998ac2
ND		 5593 struct net *net = dev_net(ifp->idev->dev);
5594
c15b1cca
HFS		 5595 if (event)
5596 ASSERT_RTNL();
5597
1da177e4
LT		 5598 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
5599
5600 switch (event) {
5601 case RTM_NEWADDR:
95c385b4
NH		 5602 /*
5603 * If the address was optimistic
5604 * we inserted the route at the start of
5605 * our DAD process, so we don't need
5606 * to do it again
5607 */
4e587ea7 5608 if (!rcu_access_pointer(ifp->rt->rt6i_node))
95c385b4 5609 ip6_ins_rt(ifp->rt);
1da177e4
LT		 5610 if (ifp->idev->cnf.forwarding)
5611 addrconf_join_anycast(ifp);
7996c799 5612 if (!ipv6_addr_any(&ifp->peer_addr))
caeaba79
ND		 5613 addrconf_prefix_route(&ifp->peer_addr, 128,
5614 ifp->idev->dev, 0, 0);
1da177e4
LT		 5615 break;
5616 case RTM_DELADDR:
5617 if (ifp->idev->cnf.forwarding)
5618 addrconf_leave_anycast(ifp);
5619 addrconf_leave_solict(ifp->idev, &ifp->addr);
7996c799 5620 if (!ipv6_addr_any(&ifp->peer_addr)) {
caeaba79 5621 struct rt6_info *rt;
caeaba79 5622
e7478dfc
ND		 5623 rt = addrconf_get_prefix_route(&ifp->peer_addr, 128,
5624 ifp->idev->dev, 0, 0);
8e3d5be7
MKL		 5625 if (rt)
5626 ip6_del_rt(rt);
caeaba79 5627 }
38bd10c4 5628 if (ifp->rt) {
ad65a2f0
WW		 5629 if (dst_hold_safe(&ifp->rt->dst))
5630 ip6_del_rt(ifp->rt);
38bd10c4 5631 }
705f1c86 5632 rt_genid_bump_ipv6(net);
1da177e4
LT		 5633 break;
5634 }
63998ac2 5635 atomic_inc(&net->ipv6.dev_addr_genid);
1da177e4
LT		 5636}
5637
5638static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
5639{
8814c4b5 5640 rcu_read_lock_bh();
1da177e4
LT		 5641 if (likely(ifp->idev->dead == 0))
5642 __ipv6_ifa_notify(event, ifp);
8814c4b5 5643 rcu_read_unlock_bh();
1da177e4
LT		 5644}
5645
5646#ifdef CONFIG_SYSCTL
5647
5648static
fe2c6338 5649int addrconf_sysctl_forward(struct ctl_table *ctl, int write,
1da177e4
LT		 5650 void __user *buffer, size_t *lenp, loff_t *ppos)
5651{
5652 int *valp = ctl->data;
5653 int val = *valp;
88af182e 5654 loff_t pos = *ppos;
fe2c6338 5655 struct ctl_table lctl;
1da177e4
LT		 5656 int ret;
5657
013d97e9
FR		 5658 /*
5659 * ctl->data points to idev->cnf.forwarding, we should
5660 * not modify it until we get the rtnl lock.
5661 */
5662 lctl = *ctl;
5663 lctl.data = &val;
5664
5665 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
1da177e4 5666
c8fecf22 5667 if (write)
b325fddb 5668 ret = addrconf_fixup_forwarding(ctl, valp, val);
88af182e
EB		 5669 if (ret)
5670 *ppos = pos;
1ab1457c 5671 return ret;
1da177e4
LT		 5672}
5673
77751427
ML		 5674static
5675int addrconf_sysctl_mtu(struct ctl_table *ctl, int write,
5676 void __user *buffer, size_t *lenp, loff_t *ppos)
5677{
5678 struct inet6_dev *idev = ctl->extra1;
5679 int min_mtu = IPV6_MIN_MTU;
5680 struct ctl_table lctl;
5681
5682 lctl = *ctl;
5683 lctl.extra1 = &min_mtu;
5684 lctl.extra2 = idev ? &idev->dev->mtu : NULL;
5685
5686 return proc_dointvec_minmax(&lctl, write, buffer, lenp, ppos);
5687}
5688
56d417b1
BH		 5689static void dev_disable_change(struct inet6_dev *idev)
5690{
75538c2b
CW		 5691 struct netdev_notifier_info info;
5692
56d417b1
BH		 5693 if (!idev || !idev->dev)
5694 return;
5695
75538c2b 5696 netdev_notifier_info_init(&info, idev->dev);
56d417b1 5697 if (idev->cnf.disable_ipv6)
75538c2b 5698 addrconf_notify(NULL, NETDEV_DOWN, &info);
56d417b1 5699 else
75538c2b 5700 addrconf_notify(NULL, NETDEV_UP, &info);
56d417b1
BH		 5701}
5702
5703static void addrconf_disable_change(struct net *net, __s32 newf)
5704{
5705 struct net_device *dev;
5706 struct inet6_dev *idev;
5707
03e4deff 5708 for_each_netdev(net, dev) {
56d417b1
BH		 5709 idev = __in6_dev_get(dev);
5710 if (idev) {
5711 int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
5712 idev->cnf.disable_ipv6 = newf;
5713 if (changed)
5714 dev_disable_change(idev);
5715 }
56d417b1 5716 }
56d417b1
BH		 5717}
5718
013d97e9 5719static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf)
56d417b1
BH		 5720{
5721 struct net *net;
013d97e9
FR		 5722 int old;
5723
5724 if (!rtnl_trylock())
5725 return restart_syscall();
56d417b1
BH		 5726
5727 net = (struct net *)table->extra2;
013d97e9
FR		 5728 old = *p;
5729 *p = newf;
56d417b1 5730
013d97e9
FR		 5731 if (p == &net->ipv6.devconf_dflt->disable_ipv6) {
5732 rtnl_unlock();
56d417b1 5733 return 0;
88af182e 5734 }
56d417b1
BH		 5735
5736 if (p == &net->ipv6.devconf_all->disable_ipv6) {
56d417b1
BH		 5737 net->ipv6.devconf_dflt->disable_ipv6 = newf;
5738 addrconf_disable_change(net, newf);
013d97e9 5739 } else if ((!newf) ^ (!old))
56d417b1
BH		 5740 dev_disable_change((struct inet6_dev *)table->extra1);
5741
5742 rtnl_unlock();
5743 return 0;
5744}
5745
5746static
fe2c6338 5747int addrconf_sysctl_disable(struct ctl_table *ctl, int write,
56d417b1
BH		 5748 void __user *buffer, size_t *lenp, loff_t *ppos)
5749{
5750 int *valp = ctl->data;
5751 int val = *valp;
88af182e 5752 loff_t pos = *ppos;
fe2c6338 5753 struct ctl_table lctl;
56d417b1
BH		 5754 int ret;
5755
013d97e9
FR		 5756 /*
5757 * ctl->data points to idev->cnf.disable_ipv6, we should
5758 * not modify it until we get the rtnl lock.
5759 */
5760 lctl = *ctl;
5761 lctl.data = &val;
5762
5763 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
56d417b1
BH		 5764
5765 if (write)
5766 ret = addrconf_disable_ipv6(ctl, valp, val);
88af182e
EB		 5767 if (ret)
5768 *ppos = pos;
56d417b1
BH		 5769 return ret;
5770}
5771
c92d5491 5772static
5773int addrconf_sysctl_proxy_ndp(struct ctl_table *ctl, int write,
5774 void __user *buffer, size_t *lenp, loff_t *ppos)
5775{
5776 int *valp = ctl->data;
5777 int ret;
5778 int old, new;
5779
5780 old = *valp;
5781 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
5782 new = *valp;
5783
5784 if (write && old != new) {
5785 struct net *net = ctl->extra2;
5786
5787 if (!rtnl_trylock())
5788 return restart_syscall();
5789
5790 if (valp == &net->ipv6.devconf_dflt->proxy_ndp)
85b3daad
DA		 5791 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
5792 NETCONFA_PROXY_NEIGH,
c92d5491 5793 NETCONFA_IFINDEX_DEFAULT,
5794 net->ipv6.devconf_dflt);
5795 else if (valp == &net->ipv6.devconf_all->proxy_ndp)
85b3daad
DA		 5796 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
5797 NETCONFA_PROXY_NEIGH,
c92d5491 5798 NETCONFA_IFINDEX_ALL,
5799 net->ipv6.devconf_all);
5800 else {
5801 struct inet6_dev *idev = ctl->extra1;
5802
85b3daad
DA		 5803 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
5804 NETCONFA_PROXY_NEIGH,
c92d5491 5805 idev->dev->ifindex,
5806 &idev->cnf);
5807 }
5808 rtnl_unlock();
5809 }
5810
5811 return ret;
5812}
5813
d35a00b8
FJ		 5814static int addrconf_sysctl_addr_gen_mode(struct ctl_table *ctl, int write,
5815 void __user *buffer, size_t *lenp,
5816 loff_t *ppos)
5817{
5818 int ret = 0;
5819 int new_val;
5820 struct inet6_dev *idev = (struct inet6_dev *)ctl->extra1;
5821 struct net *net = (struct net *)ctl->extra2;
5822
8c171d6c
FJ		 5823 if (!rtnl_trylock())
5824 return restart_syscall();
5825
d35a00b8
FJ		 5826 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
5827
5828 if (write) {
5829 new_val = *((int *)ctl->data);
5830
8c171d6c
FJ		 5831 if (check_addr_gen_mode(new_val) < 0) {
5832 ret = -EINVAL;
5833 goto out;
5834 }
d35a00b8
FJ		 5835
5836 /* request for default */
5837 if (&net->ipv6.devconf_dflt->addr_gen_mode == ctl->data) {
5838 ipv6_devconf_dflt.addr_gen_mode = new_val;
5839
5840 /* request for individual net device */
5841 } else {
5842 if (!idev)
8c171d6c 5843 goto out;
d35a00b8 5844
8c171d6c
FJ		 5845 if (check_stable_privacy(idev, net, new_val) < 0) {
5846 ret = -EINVAL;
5847 goto out;
5848 }
d35a00b8
FJ		 5849
5850 if (idev->cnf.addr_gen_mode != new_val) {
5851 idev->cnf.addr_gen_mode = new_val;
d35a00b8 5852 addrconf_dev_config(idev->dev);
d35a00b8
FJ		 5853 }
5854 }
5855 }
5856
8c171d6c
FJ		 5857out:
5858 rtnl_unlock();
5859
d35a00b8
FJ		 5860 return ret;
5861}
5862
3d1bec99
HFS		 5863static int addrconf_sysctl_stable_secret(struct ctl_table *ctl, int write,
5864 void __user *buffer, size_t *lenp,
5865 loff_t *ppos)
5866{
5867 int err;
5868 struct in6_addr addr;
5869 char str[IPV6_MAX_STRLEN];
5870 struct ctl_table lctl = *ctl;
622c81d5 5871 struct net *net = ctl->extra2;
3d1bec99
HFS		 5872 struct ipv6_stable_secret *secret = ctl->data;
5873
622c81d5
HFS		 5874 if (&net->ipv6.devconf_all->stable_secret == ctl->data)
5875 return -EIO;
5876
3d1bec99
HFS		 5877 lctl.maxlen = IPV6_MAX_STRLEN;
5878 lctl.data = str;
5879
5880 if (!rtnl_trylock())
5881 return restart_syscall();
5882
5883 if (!write && !secret->initialized) {
5884 err = -EIO;
5885 goto out;
5886 }
5887
5449a5ca
WC		 5888 err = snprintf(str, sizeof(str), "%pI6", &secret->secret);
5889 if (err >= sizeof(str)) {
5890 err = -EIO;
5891 goto out;
3d1bec99
HFS		 5892 }
5893
5894 err = proc_dostring(&lctl, write, buffer, lenp, ppos);
5895 if (err || !write)
5896 goto out;
5897
5898 if (in6_pton(str, -1, addr.in6_u.u6_addr8, -1, NULL) != 1) {
5899 err = -EIO;
5900 goto out;
5901 }
5902
5903 secret->initialized = true;
5904 secret->secret = addr;
5905
622c81d5
HFS		 5906 if (&net->ipv6.devconf_dflt->stable_secret == ctl->data) {
5907 struct net_device *dev;
5908
5909 for_each_netdev(net, dev) {
5910 struct inet6_dev *idev = __in6_dev_get(dev);
5911
5912 if (idev) {
d35a00b8 5913 idev->cnf.addr_gen_mode =
622c81d5
HFS		 5914 IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
5915 }
5916 }
5917 } else {
5918 struct inet6_dev *idev = ctl->extra1;
5919
d35a00b8 5920 idev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
622c81d5
HFS		 5921 }
5922
3d1bec99
HFS		 5923out:
5924 rtnl_unlock();
5925
5926 return err;
5927}
c92d5491 5928
35103d11
AG		 5929static
5930int addrconf_sysctl_ignore_routes_with_linkdown(struct ctl_table *ctl,
5931 int write,
5932 void __user *buffer,
5933 size_t *lenp,
5934 loff_t *ppos)
5935{
5936 int *valp = ctl->data;
5937 int val = *valp;
5938 loff_t pos = *ppos;
5939 struct ctl_table lctl;
5940 int ret;
5941
5942 /* ctl->data points to idev->cnf.ignore_routes_when_linkdown
5943 * we should not modify it until we get the rtnl lock.
5944 */
5945 lctl = *ctl;
5946 lctl.data = &val;
5947
5948 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
5949
5950 if (write)
5951 ret = addrconf_fixup_linkdown(ctl, valp, val);
5952 if (ret)
5953 *ppos = pos;
5954 return ret;
5955}
5956
df789fe7
DF		 5957static
5958void addrconf_set_nopolicy(struct rt6_info *rt, int action)
5959{
5960 if (rt) {
5961 if (action)
5962 rt->dst.flags |= DST_NOPOLICY;
5963 else
5964 rt->dst.flags &= ~DST_NOPOLICY;
5965 }
5966}
5967
5968static
5969void addrconf_disable_policy_idev(struct inet6_dev *idev, int val)
5970{
5971 struct inet6_ifaddr *ifa;
5972
5973 read_lock_bh(&idev->lock);
5974 list_for_each_entry(ifa, &idev->addr_list, if_list) {
5975 spin_lock(&ifa->lock);
5976 if (ifa->rt) {
5977 struct rt6_info *rt = ifa->rt;
df789fe7
DF		 5978 int cpu;
5979
66f5d6ce 5980 rcu_read_lock();
df789fe7
DF		 5981 addrconf_set_nopolicy(ifa->rt, val);
5982 if (rt->rt6i_pcpu) {
5983 for_each_possible_cpu(cpu) {
5984 struct rt6_info **rtp;
5985
5986 rtp = per_cpu_ptr(rt->rt6i_pcpu, cpu);
5987 addrconf_set_nopolicy(*rtp, val);
5988 }
5989 }
66f5d6ce 5990 rcu_read_unlock();
df789fe7
DF		 5991 }
5992 spin_unlock(&ifa->lock);
5993 }
5994 read_unlock_bh(&idev->lock);
5995}
5996
5997static
5998int addrconf_disable_policy(struct ctl_table *ctl, int *valp, int val)
5999{
6000 struct inet6_dev *idev;
6001 struct net *net;
6002
6003 if (!rtnl_trylock())
6004 return restart_syscall();
6005
6006 *valp = val;
6007
6008 net = (struct net *)ctl->extra2;
6009 if (valp == &net->ipv6.devconf_dflt->disable_policy) {
6010 rtnl_unlock();
6011 return 0;
6012 }
6013
6014 if (valp == &net->ipv6.devconf_all->disable_policy) {
6015 struct net_device *dev;
6016
6017 for_each_netdev(net, dev) {
6018 idev = __in6_dev_get(dev);
6019 if (idev)
6020 addrconf_disable_policy_idev(idev, val);
6021 }
6022 } else {
6023 idev = (struct inet6_dev *)ctl->extra1;
6024 addrconf_disable_policy_idev(idev, val);
6025 }
6026
6027 rtnl_unlock();
6028 return 0;
6029}
6030
6031static
6032int addrconf_sysctl_disable_policy(struct ctl_table *ctl, int write,
6033 void __user *buffer, size_t *lenp,
6034 loff_t *ppos)
6035{
6036 int *valp = ctl->data;
6037 int val = *valp;
6038 loff_t pos = *ppos;
6039 struct ctl_table lctl;
6040 int ret;
6041
6042 lctl = *ctl;
6043 lctl.data = &val;
6044 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
6045
6046 if (write && (*valp != val))
6047 ret = addrconf_disable_policy(ctl, valp, val);
6048
6049 if (ret)
6050 *ppos = pos;
6051
6052 return ret;
6053}
6054
cb4a4c69 6055static int minus_one = -1;
2210d6b2 6056static const int zero = 0;
cb9e684e
MŻ		 6057static const int one = 1;
6058static const int two_five_five = 255;
6059
607ea7cd 6060static const struct ctl_table addrconf_sysctl[] = {
5df1f77f
KK		 6061 {
6062 .procname = "forwarding",
6063 .data = &ipv6_devconf.forwarding,
6064 .maxlen = sizeof(int),
6065 .mode = 0644,
6066 .proc_handler = addrconf_sysctl_forward,
6067 },
6068 {
6069 .procname = "hop_limit",
6070 .data = &ipv6_devconf.hop_limit,
6071 .maxlen = sizeof(int),
6072 .mode = 0644,
cb9e684e
MŻ		 6073 .proc_handler = proc_dointvec_minmax,
6074 .extra1 = (void *)&one,
6075 .extra2 = (void *)&two_five_five,
5df1f77f
KK		 6076 },
6077 {
6078 .procname = "mtu",
6079 .data = &ipv6_devconf.mtu6,
6080 .maxlen = sizeof(int),
6081 .mode = 0644,
6082 .proc_handler = addrconf_sysctl_mtu,
6083 },
6084 {
6085 .procname = "accept_ra",
6086 .data = &ipv6_devconf.accept_ra,
6087 .maxlen = sizeof(int),
6088 .mode = 0644,
6089 .proc_handler = proc_dointvec,
6090 },
6091 {
6092 .procname = "accept_redirects",
6093 .data = &ipv6_devconf.accept_redirects,
6094 .maxlen = sizeof(int),
6095 .mode = 0644,
6096 .proc_handler = proc_dointvec,
6097 },
6098 {
6099 .procname = "autoconf",
6100 .data = &ipv6_devconf.autoconf,
6101 .maxlen = sizeof(int),
6102 .mode = 0644,
6103 .proc_handler = proc_dointvec,
6104 },
6105 {
6106 .procname = "dad_transmits",
6107 .data = &ipv6_devconf.dad_transmits,
6108 .maxlen = sizeof(int),
6109 .mode = 0644,
6110 .proc_handler = proc_dointvec,
6111 },
6112 {
6113 .procname = "router_solicitations",
6114 .data = &ipv6_devconf.rtr_solicits,
6115 .maxlen = sizeof(int),
6116 .mode = 0644,
cb4a4c69
MŻ		 6117 .proc_handler = proc_dointvec_minmax,
6118 .extra1 = &minus_one,
5df1f77f
KK		 6119 },
6120 {
6121 .procname = "router_solicitation_interval",
6122 .data = &ipv6_devconf.rtr_solicit_interval,
6123 .maxlen = sizeof(int),
6124 .mode = 0644,
6125 .proc_handler = proc_dointvec_jiffies,
6126 },
bd11f074
MŻ		 6127 {
6128 .procname = "router_solicitation_max_interval",
6129 .data = &ipv6_devconf.rtr_solicit_max_interval,
6130 .maxlen = sizeof(int),
6131 .mode = 0644,
6132 .proc_handler = proc_dointvec_jiffies,
6133 },
5df1f77f
KK		 6134 {
6135 .procname = "router_solicitation_delay",
6136 .data = &ipv6_devconf.rtr_solicit_delay,
6137 .maxlen = sizeof(int),
6138 .mode = 0644,
6139 .proc_handler = proc_dointvec_jiffies,
6140 },
6141 {
6142 .procname = "force_mld_version",
6143 .data = &ipv6_devconf.force_mld_version,
6144 .maxlen = sizeof(int),
6145 .mode = 0644,
6146 .proc_handler = proc_dointvec,
6147 },
6148 {
6149 .procname = "mldv1_unsolicited_report_interval",
6150 .data =
6151 &ipv6_devconf.mldv1_unsolicited_report_interval,
6152 .maxlen = sizeof(int),
6153 .mode = 0644,
6154 .proc_handler = proc_dointvec_ms_jiffies,
6155 },
6156 {
6157 .procname = "mldv2_unsolicited_report_interval",
6158 .data =
6159 &ipv6_devconf.mldv2_unsolicited_report_interval,
6160 .maxlen = sizeof(int),
6161 .mode = 0644,
6162 .proc_handler = proc_dointvec_ms_jiffies,
6163 },
6164 {
6165 .procname = "use_tempaddr",
6166 .data = &ipv6_devconf.use_tempaddr,
6167 .maxlen = sizeof(int),
6168 .mode = 0644,
6169 .proc_handler = proc_dointvec,
6170 },
6171 {
6172 .procname = "temp_valid_lft",
6173 .data = &ipv6_devconf.temp_valid_lft,
6174 .maxlen = sizeof(int),
6175 .mode = 0644,
6176 .proc_handler = proc_dointvec,
6177 },
6178 {
6179 .procname = "temp_prefered_lft",
6180 .data = &ipv6_devconf.temp_prefered_lft,
6181 .maxlen = sizeof(int),
6182 .mode = 0644,
6183 .proc_handler = proc_dointvec,
6184 },
6185 {
6186 .procname = "regen_max_retry",
6187 .data = &ipv6_devconf.regen_max_retry,
6188 .maxlen = sizeof(int),
6189 .mode = 0644,
6190 .proc_handler = proc_dointvec,
6191 },
6192 {
6193 .procname = "max_desync_factor",
6194 .data = &ipv6_devconf.max_desync_factor,
6195 .maxlen = sizeof(int),
6196 .mode = 0644,
6197 .proc_handler = proc_dointvec,
6198 },
6199 {
6200 .procname = "max_addresses",
6201 .data = &ipv6_devconf.max_addresses,
6202 .maxlen = sizeof(int),
6203 .mode = 0644,
6204 .proc_handler = proc_dointvec,
6205 },
6206 {
6207 .procname = "accept_ra_defrtr",
6208 .data = &ipv6_devconf.accept_ra_defrtr,
6209 .maxlen = sizeof(int),
6210 .mode = 0644,
6211 .proc_handler = proc_dointvec,
6212 },
6213 {
6214 .procname = "accept_ra_min_hop_limit",
6215 .data = &ipv6_devconf.accept_ra_min_hop_limit,
6216 .maxlen = sizeof(int),
6217 .mode = 0644,
6218 .proc_handler = proc_dointvec,
6219 },
6220 {
6221 .procname = "accept_ra_pinfo",
6222 .data = &ipv6_devconf.accept_ra_pinfo,
6223 .maxlen = sizeof(int),
6224 .mode = 0644,
6225 .proc_handler = proc_dointvec,
6226 },
930d6ff2 6227#ifdef CONFIG_IPV6_ROUTER_PREF
5df1f77f
KK		 6228 {
6229 .procname = "accept_ra_rtr_pref",
6230 .data = &ipv6_devconf.accept_ra_rtr_pref,
6231 .maxlen = sizeof(int),
6232 .mode = 0644,
6233 .proc_handler = proc_dointvec,
6234 },
6235 {
6236 .procname = "router_probe_interval",
6237 .data = &ipv6_devconf.rtr_probe_interval,
6238 .maxlen = sizeof(int),
6239 .mode = 0644,
6240 .proc_handler = proc_dointvec_jiffies,
6241 },
fa03ef38 6242#ifdef CONFIG_IPV6_ROUTE_INFO
bbea124b
JS		 6243 {
6244 .procname = "accept_ra_rt_info_min_plen",
6245 .data = &ipv6_devconf.accept_ra_rt_info_min_plen,
6246 .maxlen = sizeof(int),
6247 .mode = 0644,
6248 .proc_handler = proc_dointvec,
6249 },
5df1f77f
KK		 6250 {
6251 .procname = "accept_ra_rt_info_max_plen",
6252 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
6253 .maxlen = sizeof(int),
6254 .mode = 0644,
6255 .proc_handler = proc_dointvec,
6256 },
09c884d4 6257#endif
930d6ff2 6258#endif
5df1f77f
KK		 6259 {
6260 .procname = "proxy_ndp",
6261 .data = &ipv6_devconf.proxy_ndp,
6262 .maxlen = sizeof(int),
6263 .mode = 0644,
6264 .proc_handler = addrconf_sysctl_proxy_ndp,
6265 },
6266 {
6267 .procname = "accept_source_route",
6268 .data = &ipv6_devconf.accept_source_route,
6269 .maxlen = sizeof(int),
6270 .mode = 0644,
6271 .proc_handler = proc_dointvec,
6272 },
95c385b4 6273#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
5df1f77f
KK		 6274 {
6275 .procname = "optimistic_dad",
6276 .data = &ipv6_devconf.optimistic_dad,
6277 .maxlen = sizeof(int),
6278 .mode = 0644,
6279 .proc_handler = proc_dointvec,
6280 },
6281 {
6282 .procname = "use_optimistic",
6283 .data = &ipv6_devconf.use_optimistic,
6284 .maxlen = sizeof(int),
6285 .mode = 0644,
6286 .proc_handler = proc_dointvec,
6287 },
7bc570c8
YH		 6288#endif
6289#ifdef CONFIG_IPV6_MROUTE
5df1f77f
KK		 6290 {
6291 .procname = "mc_forwarding",
6292 .data = &ipv6_devconf.mc_forwarding,
6293 .maxlen = sizeof(int),
6294 .mode = 0444,
6295 .proc_handler = proc_dointvec,
6296 },
95c385b4 6297#endif
5df1f77f
KK		 6298 {
6299 .procname = "disable_ipv6",
6300 .data = &ipv6_devconf.disable_ipv6,
6301 .maxlen = sizeof(int),
6302 .mode = 0644,
6303 .proc_handler = addrconf_sysctl_disable,
6304 },
6305 {
6306 .procname = "accept_dad",
6307 .data = &ipv6_devconf.accept_dad,
6308 .maxlen = sizeof(int),
6309 .mode = 0644,
6310 .proc_handler = proc_dointvec,
6311 },
6312 {
6313 .procname = "force_tllao",
6314 .data = &ipv6_devconf.force_tllao,
6315 .maxlen = sizeof(int),
6316 .mode = 0644,
6317 .proc_handler = proc_dointvec
6318 },
6319 {
6320 .procname = "ndisc_notify",
6321 .data = &ipv6_devconf.ndisc_notify,
6322 .maxlen = sizeof(int),
6323 .mode = 0644,
6324 .proc_handler = proc_dointvec
6325 },
6326 {
6327 .procname = "suppress_frag_ndisc",
6328 .data = &ipv6_devconf.suppress_frag_ndisc,
6329 .maxlen = sizeof(int),
6330 .mode = 0644,
6331 .proc_handler = proc_dointvec
6332 },
6333 {
6334 .procname = "accept_ra_from_local",
6335 .data = &ipv6_devconf.accept_ra_from_local,
6336 .maxlen = sizeof(int),
6337 .mode = 0644,
6338 .proc_handler = proc_dointvec,
6339 },
6340 {
6341 .procname = "accept_ra_mtu",
6342 .data = &ipv6_devconf.accept_ra_mtu,
6343 .maxlen = sizeof(int),
6344 .mode = 0644,
6345 .proc_handler = proc_dointvec,
6346 },
6347 {
6348 .procname = "stable_secret",
6349 .data = &ipv6_devconf.stable_secret,
6350 .maxlen = IPV6_MAX_STRLEN,
6351 .mode = 0600,
6352 .proc_handler = addrconf_sysctl_stable_secret,
6353 },
6354 {
6355 .procname = "use_oif_addrs_only",
6356 .data = &ipv6_devconf.use_oif_addrs_only,
6357 .maxlen = sizeof(int),
6358 .mode = 0644,
6359 .proc_handler = proc_dointvec,
6360 },
6361 {
6362 .procname = "ignore_routes_with_linkdown",
6363 .data = &ipv6_devconf.ignore_routes_with_linkdown,
6364 .maxlen = sizeof(int),
6365 .mode = 0644,
6366 .proc_handler = addrconf_sysctl_ignore_routes_with_linkdown,
6367 },
6368 {
6369 .procname = "drop_unicast_in_l2_multicast",
6370 .data = &ipv6_devconf.drop_unicast_in_l2_multicast,
6371 .maxlen = sizeof(int),
6372 .mode = 0644,
6373 .proc_handler = proc_dointvec,
6374 },
6375 {
6376 .procname = "drop_unsolicited_na",
6377 .data = &ipv6_devconf.drop_unsolicited_na,
6378 .maxlen = sizeof(int),
6379 .mode = 0644,
6380 .proc_handler = proc_dointvec,
6381 },
6382 {
6383 .procname = "keep_addr_on_down",
6384 .data = &ipv6_devconf.keep_addr_on_down,
6385 .maxlen = sizeof(int),
6386 .mode = 0644,
6387 .proc_handler = proc_dointvec,
6388
6389 },
1ababeba
DL		 6390 {
6391 .procname = "seg6_enabled",
6392 .data = &ipv6_devconf.seg6_enabled,
6393 .maxlen = sizeof(int),
6394 .mode = 0644,
6395 .proc_handler = proc_dointvec,
6396 },
bf355b8d
DL		 6397#ifdef CONFIG_IPV6_SEG6_HMAC
6398 {
6399 .procname = "seg6_require_hmac",
6400 .data = &ipv6_devconf.seg6_require_hmac,
6401 .maxlen = sizeof(int),
6402 .mode = 0644,
6403 .proc_handler = proc_dointvec,
6404 },
6405#endif
adc176c5
EN		 6406 {
6407 .procname = "enhanced_dad",
6408 .data = &ipv6_devconf.enhanced_dad,
6409 .maxlen = sizeof(int),
6410 .mode = 0644,
6411 .proc_handler = proc_dointvec,
6412 },
d35a00b8
FJ		 6413 {
6414 .procname = "addr_gen_mode",
6415 .data = &ipv6_devconf.addr_gen_mode,
6416 .maxlen = sizeof(int),
6417 .mode = 0644,
6418 .proc_handler = addrconf_sysctl_addr_gen_mode,
6419 },
df789fe7
DF		 6420 {
6421 .procname = "disable_policy",
6422 .data = &ipv6_devconf.disable_policy,
6423 .maxlen = sizeof(int),
6424 .mode = 0644,
6425 .proc_handler = addrconf_sysctl_disable_policy,
6426 },
2210d6b2
MŻ		 6427 {
6428 .procname = "ndisc_tclass",
6429 .data = &ipv6_devconf.ndisc_tclass,
6430 .maxlen = sizeof(int),
6431 .mode = 0644,
6432 .proc_handler = proc_dointvec_minmax,
6433 .extra1 = (void *)&zero,
6434 .extra2 = (void *)&two_five_five,
6435 },
5df1f77f
KK		 6436 {
6437 /* sentinel */
6438 }
1da177e4
LT		 6439};
6440
bff16c2f 6441static int __addrconf_sysctl_register(struct net *net, char *dev_name,
f8572d8f 6442 struct inet6_dev *idev, struct ipv6_devconf *p)
1da177e4 6443{
29c994e3 6444 int i, ifindex;
607ea7cd 6445 struct ctl_table *table;
6105e293 6446 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ];
1dab6222 6447
607ea7cd
KK		 6448 table = kmemdup(addrconf_sysctl, sizeof(addrconf_sysctl), GFP_KERNEL);
6449 if (!table)
f68635e6
PE		 6450 goto out;
6451
607ea7cd
KK		 6452 for (i = 0; table[i].data; i++) {
6453 table[i].data += (char *)p - (char *)&ipv6_devconf;
cb9e684e
MŻ		 6454 /* If one of these is already set, then it is not safe to
6455 * overwrite either of them: this makes proc_dointvec_minmax
6456 * usable.
6457 */
6458 if (!table[i].extra1 && !table[i].extra2) {
6459 table[i].extra1 = idev; /* embedded; no ref */
6460 table[i].extra2 = net;
6461 }
1da177e4 6462 }
1da177e4 6463
6105e293 6464 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name);
1da177e4 6465
607ea7cd
KK		 6466 p->sysctl_header = register_net_sysctl(net, path, table);
6467 if (!p->sysctl_header)
6105e293 6468 goto free;
f68635e6 6469
29c994e3
ND		 6470 if (!strcmp(dev_name, "all"))
6471 ifindex = NETCONFA_IFINDEX_ALL;
6472 else if (!strcmp(dev_name, "default"))
6473 ifindex = NETCONFA_IFINDEX_DEFAULT;
6474 else
6475 ifindex = idev->dev->ifindex;
85b3daad
DA		 6476 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, NETCONFA_ALL,
6477 ifindex, p);
95897312 6478 return 0;
1da177e4 6479
f68635e6 6480free:
607ea7cd 6481 kfree(table);
f68635e6 6482out:
95897312 6483 return -ENOBUFS;
1da177e4
LT		 6484}
6485
23452170
DA		 6486static void __addrconf_sysctl_unregister(struct net *net,
6487 struct ipv6_devconf *p, int ifindex)
408c4768 6488{
607ea7cd 6489 struct ctl_table *table;
408c4768 6490
607ea7cd 6491 if (!p->sysctl_header)
408c4768
PE		 6492 return;
6493
607ea7cd
KK		 6494 table = p->sysctl_header->ctl_table_arg;
6495 unregister_net_sysctl_table(p->sysctl_header);
6496 p->sysctl_header = NULL;
6497 kfree(table);
23452170
DA		 6498
6499 inet6_netconf_notify_devconf(net, RTM_DELNETCONF, 0, ifindex, NULL);
408c4768
PE		 6500}
6501
a317a2f1 6502static int addrconf_sysctl_register(struct inet6_dev *idev)
f52295a9 6503{
a317a2f1
WC		 6504 int err;
6505
6506 if (!sysctl_dev_name_is_allowed(idev->dev->name))
6507 return -EINVAL;
6508
6509 err = neigh_sysctl_register(idev->dev, idev->nd_parms,
6510 &ndisc_ifinfo_sysctl_change);
6511 if (err)
6512 return err;
6513 err = __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
6514 idev, &idev->cnf);
6515 if (err)
6516 neigh_sysctl_unregister(idev->nd_parms);
6517
6518 return err;
f52295a9
PE		 6519}
6520
408c4768 6521static void addrconf_sysctl_unregister(struct inet6_dev *idev)
1da177e4 6522{
23452170
DA		 6523 __addrconf_sysctl_unregister(dev_net(idev->dev), &idev->cnf,
6524 idev->dev->ifindex);
408c4768 6525 neigh_sysctl_unregister(idev->nd_parms);
1da177e4
LT		 6526}
6527
6528
6529#endif
6530
2c8c1e72 6531static int __net_init addrconf_init_net(struct net *net)
e0da5a48 6532{
a79ca223 6533 int err = -ENOMEM;
e0da5a48
PE		 6534 struct ipv6_devconf *all, *dflt;
6535
a79ca223 6536 all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL);
63159f29 6537 if (!all)
a79ca223 6538 goto err_alloc_all;
e0da5a48 6539
a79ca223 6540 dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
63159f29 6541 if (!dflt)
a79ca223 6542 goto err_alloc_dflt;
e0da5a48 6543
a79ca223
HZ		 6544 /* these will be inherited by all namespaces */
6545 dflt->autoconf = ipv6_defaults.autoconf;
6546 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
e0da5a48 6547
3d1bec99
HFS		 6548 dflt->stable_secret.initialized = false;
6549 all->stable_secret.initialized = false;
6550
e0da5a48
PE		 6551 net->ipv6.devconf_all = all;
6552 net->ipv6.devconf_dflt = dflt;
6553
6554#ifdef CONFIG_SYSCTL
f8572d8f 6555 err = __addrconf_sysctl_register(net, "all", NULL, all);
e0da5a48
PE		 6556 if (err < 0)
6557 goto err_reg_all;
6558
f8572d8f 6559 err = __addrconf_sysctl_register(net, "default", NULL, dflt);
e0da5a48
PE		 6560 if (err < 0)
6561 goto err_reg_dflt;
6562#endif
6563 return 0;
6564
6565#ifdef CONFIG_SYSCTL
6566err_reg_dflt:
23452170 6567 __addrconf_sysctl_unregister(net, all, NETCONFA_IFINDEX_ALL);
e0da5a48
PE		 6568err_reg_all:
6569 kfree(dflt);
6570#endif
6571err_alloc_dflt:
6572 kfree(all);
6573err_alloc_all:
6574 return err;
6575}
6576
2c8c1e72 6577static void __net_exit addrconf_exit_net(struct net *net)
e0da5a48
PE		 6578{
6579#ifdef CONFIG_SYSCTL
23452170
DA		 6580 __addrconf_sysctl_unregister(net, net->ipv6.devconf_dflt,
6581 NETCONFA_IFINDEX_DEFAULT);
6582 __addrconf_sysctl_unregister(net, net->ipv6.devconf_all,
6583 NETCONFA_IFINDEX_ALL);
e0da5a48 6584#endif
73cf0e92 6585 kfree(net->ipv6.devconf_dflt);
6586 kfree(net->ipv6.devconf_all);
e0da5a48
PE		 6587}
6588
6589static struct pernet_operations addrconf_ops = {
6590 .init = addrconf_init_net,
6591 .exit = addrconf_exit_net,
0bc9be67 6592 .async = true,
e0da5a48
PE		 6593};
6594
207895fd 6595static struct rtnl_af_ops inet6_ops __read_mostly = {
b382b191
TG		 6596 .family = AF_INET6,
6597 .fill_link_af = inet6_fill_link_af,
6598 .get_link_af_size = inet6_get_link_af_size,
11b1f828 6599 .validate_link_af = inet6_validate_link_af,
f53adae4 6600 .set_link_af = inet6_set_link_af,
b382b191
TG		 6601};
6602
1da177e4
LT		 6603/*
6604 * Init / cleanup code
6605 */
6606
6607int __init addrconf_init(void)
6608{
a317a2f1 6609 struct inet6_dev *idev;
c2e21293 6610 int i, err;
2a8cc6c8 6611
e21e8467
SH		 6612 err = ipv6_addr_label_init();
6613 if (err < 0) {
f3213831
JP		 6614 pr_crit("%s: cannot initialize default policy table: %d\n",
6615 __func__, err);
2cc6d2bf 6616 goto out;
2a8cc6c8 6617 }
1da177e4 6618
2cc6d2bf
NH		 6619 err = register_pernet_subsys(&addrconf_ops);
6620 if (err < 0)
6621 goto out_addrlabel;
e0da5a48 6622
c15b1cca
HFS		 6623 addrconf_wq = create_workqueue("ipv6_addrconf");
6624 if (!addrconf_wq) {
6625 err = -ENOMEM;
6626 goto out_nowq;
6627 }
6628
1da177e4
LT		 6629 /* The addrconf netdev notifier requires that loopback_dev
6630 * has it's ipv6 private information allocated and setup
6631 * before it can bring up and give link-local addresses
6632 * to other devices which are up.
6633 *
6634 * Unfortunately, loopback_dev is not necessarily the first
6635 * entry in the global dev_base list of net devices. In fact,
6636 * it is likely to be the very last entry on that list.
6637 * So this causes the notifier registry below to try and
6638 * give link-local addresses to all devices besides loopback_dev
6639 * first, then loopback_dev, which cases all the non-loopback_dev
6640 * devices to fail to get a link-local address.
6641 *
6642 * So, as a temporary fix, allocate the ipv6 structure for
6643 * loopback_dev first by hand.
6644 * Longer term, all of the dependencies ipv6 has upon the loopback
6645 * device and it being up should be removed.
6646 */
6647 rtnl_lock();
a317a2f1 6648 idev = ipv6_add_dev(init_net.loopback_dev);
1da177e4 6649 rtnl_unlock();
a317a2f1
WC		 6650 if (IS_ERR(idev)) {
6651 err = PTR_ERR(idev);
e0da5a48 6652 goto errlo;
a317a2f1 6653 }
1da177e4 6654
2f460933
WC		 6655 ip6_route_init_special_entries();
6656
c2e21293 6657 for (i = 0; i < IN6_ADDR_HSIZE; i++)
6658 INIT_HLIST_HEAD(&inet6_addr_lst[i]);
6659
1da177e4
LT		 6660 register_netdevice_notifier(&ipv6_dev_notf);
6661
c15b1cca 6662 addrconf_verify();
c127ea2c 6663
3678a9d8 6664 rtnl_af_register(&inet6_ops);
b382b191 6665
16feebcf
FW		 6666 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETLINK,
6667 NULL, inet6_dump_ifinfo, 0);
c127ea2c
TG		 6668 if (err < 0)
6669 goto errout;
6670
16feebcf
FW		 6671 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_NEWADDR,
6672 inet6_rtm_newaddr, NULL, 0);
6673 if (err < 0)
6674 goto errout;
6675 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_DELADDR,
6676 inet6_rtm_deladdr, NULL, 0);
6677 if (err < 0)
6678 goto errout;
6679 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETADDR,
6680 inet6_rtm_getaddr, inet6_dump_ifaddr,
6681 RTNL_FLAG_DOIT_UNLOCKED);
6682 if (err < 0)
6683 goto errout;
6684 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETMULTICAST,
6685 NULL, inet6_dump_ifmcaddr, 0);
6686 if (err < 0)
6687 goto errout;
6688 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETANYCAST,
6689 NULL, inet6_dump_ifacaddr, 0);
6690 if (err < 0)
6691 goto errout;
6692 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETNETCONF,
6693 inet6_netconf_get_devconf,
6694 inet6_netconf_dump_devconf,
6695 RTNL_FLAG_DOIT_UNLOCKED);
6696 if (err < 0)
6697 goto errout;
a3fde2ad
FW		 6698 err = ipv6_addr_label_rtnl_register();
6699 if (err < 0)
6700 goto errout;
2a8cc6c8 6701
1da177e4 6702 return 0;
c127ea2c 6703errout:
16feebcf 6704 rtnl_unregister_all(PF_INET6);
b382b191 6705 rtnl_af_unregister(&inet6_ops);
c127ea2c 6706 unregister_netdevice_notifier(&ipv6_dev_notf);
e0da5a48 6707errlo:
c15b1cca
HFS		 6708 destroy_workqueue(addrconf_wq);
6709out_nowq:
e0da5a48 6710 unregister_pernet_subsys(&addrconf_ops);
2cc6d2bf
NH		 6711out_addrlabel:
6712 ipv6_addr_label_cleanup();
6713out:
c127ea2c 6714 return err;
1da177e4
LT		 6715}
6716
09f7709f 6717void addrconf_cleanup(void)
1da177e4 6718{
176c39af 6719 struct net_device *dev;
1da177e4
LT		 6720 int i;
6721
6722 unregister_netdevice_notifier(&ipv6_dev_notf);
e0da5a48 6723 unregister_pernet_subsys(&addrconf_ops);
2cc6d2bf 6724 ipv6_addr_label_cleanup();
1da177e4 6725
5c45121d 6726 rtnl_af_unregister(&inet6_ops);
1da177e4 6727
5c45121d 6728 rtnl_lock();
b382b191 6729
176c39af
DL		 6730 /* clean dev list */
6731 for_each_netdev(&init_net, dev) {
6732 if (__in6_dev_get(dev) == NULL)
6733 continue;
6734 addrconf_ifdown(dev, 1);
6735 }
6736 addrconf_ifdown(init_net.loopback_dev, 2);
6737
1da177e4
LT		 6738 /*
6739 * Check hash table.
6740 */
5c578aed 6741 spin_lock_bh(&addrconf_hash_lock);
c2e21293 6742 for (i = 0; i < IN6_ADDR_HSIZE; i++)
6743 WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
5c578aed 6744 spin_unlock_bh(&addrconf_hash_lock);
c15b1cca 6745 cancel_delayed_work(&addr_chk_work);
1da177e4 6746 rtnl_unlock();
c15b1cca
HFS		 6747
6748 destroy_workqueue(addrconf_wq);
1da177e4 6749}
Linux 6.x block layer and io_uring tree(s)