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Merge tag 'pci-v5.13-changes' of git://git.kernel.org/pub/scm/linux/kernel/git/helgaa...
[linux-block.git] / net / ipv6 / addrconf.c
CommitLineData
2874c5fd 1// SPDX-License-Identifier: GPL-2.0-or-later
1da177e4
LT		 2/*
3 * IPv6 Address [auto]configuration
4 * Linux INET6 implementation
5 *
6 * Authors:
1ab1457c 7 * Pedro Roque <roque@di.fc.ul.pt>
1da177e4 8 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
1da177e4
LT		 9 */
10
11/*
12 * Changes:
13 *
14 * Janos Farkas : delete timer on ifdown
15 * <chexum@bankinf.banki.hu>
16 * Andi Kleen : kill double kfree on module
17 * unload.
18 * Maciej W. Rozycki : FDDI support
19 * sekiya@USAGI : Don't send too many RS
20 * packets.
21 * yoshfuji@USAGI : Fixed interval between DAD
22 * packets.
23 * YOSHIFUJI Hideaki @USAGI : improved accuracy of
24 * address validation timer.
25 * YOSHIFUJI Hideaki @USAGI : Privacy Extensions (RFC3041)
26 * support.
27 * Yuji SEKIYA @USAGI : Don't assign a same IPv6
28 * address on a same interface.
29 * YOSHIFUJI Hideaki @USAGI : ARCnet support
30 * YOSHIFUJI Hideaki @USAGI : convert /proc/net/if_inet6 to
31 * seq_file.
b1cacb68
YH		 32 * YOSHIFUJI Hideaki @USAGI : improved source address
33 * selection; consider scope,
34 * status etc.
1da177e4
LT		 35 */
36
f3213831
JP		 37#define pr_fmt(fmt) "IPv6: " fmt
38
1da177e4
LT		 39#include <linux/errno.h>
40#include <linux/types.h>
a0bffffc 41#include <linux/kernel.h>
174cd4b1 42#include <linux/sched/signal.h>
1da177e4
LT		 43#include <linux/socket.h>
44#include <linux/sockios.h>
1da177e4 45#include <linux/net.h>
3d1bec99 46#include <linux/inet.h>
1da177e4
LT		 47#include <linux/in6.h>
48#include <linux/netdevice.h>
1823730f 49#include <linux/if_addr.h>
1da177e4
LT		 50#include <linux/if_arp.h>
51#include <linux/if_arcnet.h>
52#include <linux/if_infiniband.h>
53#include <linux/route.h>
54#include <linux/inetdevice.h>
55#include <linux/init.h>
5a0e3ad6 56#include <linux/slab.h>
1da177e4
LT		 57#ifdef CONFIG_SYSCTL
58#include <linux/sysctl.h>
59#endif
4fc268d2 60#include <linux/capability.h>
1da177e4
LT		 61#include <linux/delay.h>
62#include <linux/notifier.h>
543537bd 63#include <linux/string.h>
ddbe5032 64#include <linux/hash.h>
1da177e4 65
457c4cbc 66#include <net/net_namespace.h>
1da177e4
LT		 67#include <net/sock.h>
68#include <net/snmp.h>
69
5241c2d7 70#include <net/6lowpan.h>
cb6bf355 71#include <net/firewire.h>
1da177e4
LT		 72#include <net/ipv6.h>
73#include <net/protocol.h>
74#include <net/ndisc.h>
75#include <net/ip6_route.h>
76#include <net/addrconf.h>
77#include <net/tcp.h>
78#include <net/ip.h>
5d620266 79#include <net/netlink.h>
f24e3d65 80#include <net/pkt_sched.h>
ca254490 81#include <net/l3mdev.h>
1da177e4
LT		 82#include <linux/if_tunnel.h>
83#include <linux/rtnetlink.h>
f3a1bfb1 84#include <linux/netconf.h>
1da177e4 85#include <linux/random.h>
e21e8467 86#include <linux/uaccess.h>
7f7d9a6b 87#include <asm/unaligned.h>
1da177e4
LT		 88
89#include <linux/proc_fs.h>
90#include <linux/seq_file.h>
bc3b2d7f 91#include <linux/export.h>
1da177e4 92
1da177e4 93#define INFINITY_LIFE_TIME 0xFFFFFFFF
18a31e1e 94
3d1bec99
HFS		 95#define IPV6_MAX_STRLEN \
96 sizeof("ffff:ffff:ffff:ffff:ffff:ffff:255.255.255.255")
97
18a31e1e
TG		 98static inline u32 cstamp_delta(unsigned long cstamp)
99{
100 return (cstamp - INITIAL_JIFFIES) * 100UL / HZ;
101}
1da177e4 102
bd11f074
MŻ		 103static inline s32 rfc3315_s14_backoff_init(s32 irt)
104{
105 /* multiply 'initial retransmission time' by 0.9 .. 1.1 */
106 u64 tmp = (900000 + prandom_u32() % 200001) * (u64)irt;
107 do_div(tmp, 1000000);
108 return (s32)tmp;
109}
110
111static inline s32 rfc3315_s14_backoff_update(s32 rt, s32 mrt)
112{
113 /* multiply 'retransmission timeout' by 1.9 .. 2.1 */
114 u64 tmp = (1900000 + prandom_u32() % 200001) * (u64)rt;
115 do_div(tmp, 1000000);
116 if ((s32)tmp > mrt) {
117 /* multiply 'maximum retransmission time' by 0.9 .. 1.1 */
118 tmp = (900000 + prandom_u32() % 200001) * (u64)mrt;
119 do_div(tmp, 1000000);
120 }
121 return (s32)tmp;
122}
123
1da177e4 124#ifdef CONFIG_SYSCTL
a317a2f1 125static int addrconf_sysctl_register(struct inet6_dev *idev);
408c4768
PE		 126static void addrconf_sysctl_unregister(struct inet6_dev *idev);
127#else
a317a2f1 128static inline int addrconf_sysctl_register(struct inet6_dev *idev)
408c4768 129{
a317a2f1 130 return 0;
408c4768
PE		 131}
132
133static inline void addrconf_sysctl_unregister(struct inet6_dev *idev)
134{
135}
1da177e4
LT		 136#endif
137
969c5464 138static void ipv6_gen_rnd_iid(struct in6_addr *addr);
1da177e4 139
1b34be74 140static int ipv6_generate_eui64(u8 *eui, struct net_device *dev);
d9bf82c2 141static int ipv6_count_addresses(const struct inet6_dev *idev);
622c81d5
HFS		 142static int ipv6_generate_stable_address(struct in6_addr *addr,
143 u8 dad_count,
144 const struct inet6_dev *idev);
1da177e4 145
27c565ae
ED		 146#define IN6_ADDR_HSIZE_SHIFT 8
147#define IN6_ADDR_HSIZE (1 << IN6_ADDR_HSIZE_SHIFT)
1da177e4
LT		 148/*
149 * Configured unicast address hash table
150 */
c2e21293 151static struct hlist_head inet6_addr_lst[IN6_ADDR_HSIZE];
5c578aed 152static DEFINE_SPINLOCK(addrconf_hash_lock);
1da177e4 153
c15b1cca
HFS		 154static void addrconf_verify(void);
155static void addrconf_verify_rtnl(void);
156static void addrconf_verify_work(struct work_struct *);
1da177e4 157
c15b1cca
HFS		 158static struct workqueue_struct *addrconf_wq;
159static DECLARE_DELAYED_WORK(addr_chk_work, addrconf_verify_work);
1da177e4
LT		 160
161static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
162static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
163
93d9b7d7
JP		 164static void addrconf_type_change(struct net_device *dev,
165 unsigned long event);
ae79dbf6 166static int addrconf_ifdown(struct net_device *dev, bool unregister);
1da177e4 167
8d1c802b 168static struct fib6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
21caa662
RK		 169 int plen,
170 const struct net_device *dev,
2b2450ca
DA		 171 u32 flags, u32 noflags,
172 bool no_gw);
21caa662 173
cf22f9a2 174static void addrconf_dad_start(struct inet6_ifaddr *ifp);
c15b1cca 175static void addrconf_dad_work(struct work_struct *w);
c76fe2d9
DA		 176static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id,
177 bool send_na);
896585d4 178static void addrconf_dad_run(struct inet6_dev *idev, bool restart);
e99e88a9 179static void addrconf_rs_timer(struct timer_list *t);
1da177e4
LT		 180static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
181static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
182
1ab1457c 183static void inet6_prefix_notify(int event, struct inet6_dev *idev,
1da177e4 184 struct prefix_info *pinfo);
1da177e4 185
888c848e 186static struct ipv6_devconf ipv6_devconf __read_mostly = {
1da177e4
LT		 187 .forwarding = 0,
188 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
189 .mtu6 = IPV6_MIN_MTU,
190 .accept_ra = 1,
191 .accept_redirects = 1,
192 .autoconf = 1,
193 .force_mld_version = 0,
fc4eba58
HFS		 194 .mldv1_unsolicited_report_interval = 10 * HZ,
195 .mldv2_unsolicited_report_interval = HZ,
1da177e4
LT		 196 .dad_transmits = 1,
197 .rtr_solicits = MAX_RTR_SOLICITATIONS,
198 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
bd11f074 199 .rtr_solicit_max_interval = RTR_SOLICITATION_MAX_INTERVAL,
1da177e4 200 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
67ba4152 201 .use_tempaddr = 0,
1da177e4
LT		 202 .temp_valid_lft = TEMP_VALID_LIFETIME,
203 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
204 .regen_max_retry = REGEN_MAX_RETRY,
205 .max_desync_factor = MAX_DESYNC_FACTOR,
1da177e4 206 .max_addresses = IPV6_MAX_ADDRESSES,
65f5c7c1 207 .accept_ra_defrtr = 1,
6b2e04bc 208 .ra_defrtr_metric = IP6_RT_PRIO_USER,
d9333196 209 .accept_ra_from_local = 0,
8013d1d7 210 .accept_ra_min_hop_limit= 1,
c4fd30eb 211 .accept_ra_pinfo = 1,
930d6ff2
YH		 212#ifdef CONFIG_IPV6_ROUTER_PREF
213 .accept_ra_rtr_pref = 1,
52e16356 214 .rtr_probe_interval = 60 * HZ,
09c884d4 215#ifdef CONFIG_IPV6_ROUTE_INFO
bbea124b 216 .accept_ra_rt_info_min_plen = 0,
09c884d4
YH		 217 .accept_ra_rt_info_max_plen = 0,
218#endif
930d6ff2 219#endif
fbea49e1 220 .proxy_ndp = 0,
0bcbc926 221 .accept_source_route = 0, /* we do not accept RH0 by default. */
778d80be 222 .disable_ipv6 = 0,
09400953 223 .accept_dad = 0,
b800c3b9 224 .suppress_frag_ndisc = 1,
c2943f14 225 .accept_ra_mtu = 1,
3d1bec99
HFS		 226 .stable_secret = {
227 .initialized = false,
3985e8a3
EK		 228 },
229 .use_oif_addrs_only = 0,
35103d11 230 .ignore_routes_with_linkdown = 0,
f1705ec1 231 .keep_addr_on_down = 0,
1ababeba 232 .seg6_enabled = 0,
bf355b8d
DL		 233#ifdef CONFIG_IPV6_SEG6_HMAC
234 .seg6_require_hmac = 0,
235#endif
adc176c5 236 .enhanced_dad = 1,
d35a00b8 237 .addr_gen_mode = IN6_ADDR_GEN_MODE_EUI64,
df789fe7 238 .disable_policy = 0,
8610c7c6 239 .rpl_seg_enabled = 0,
1da177e4
LT		 240};
241
ab32ea5d 242static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
1da177e4
LT		 243 .forwarding = 0,
244 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
245 .mtu6 = IPV6_MIN_MTU,
246 .accept_ra = 1,
247 .accept_redirects = 1,
248 .autoconf = 1,
fc4eba58
HFS		 249 .force_mld_version = 0,
250 .mldv1_unsolicited_report_interval = 10 * HZ,
251 .mldv2_unsolicited_report_interval = HZ,
1da177e4
LT		 252 .dad_transmits = 1,
253 .rtr_solicits = MAX_RTR_SOLICITATIONS,
254 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
bd11f074 255 .rtr_solicit_max_interval = RTR_SOLICITATION_MAX_INTERVAL,
1da177e4 256 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
1da177e4
LT		 257 .use_tempaddr = 0,
258 .temp_valid_lft = TEMP_VALID_LIFETIME,
259 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
260 .regen_max_retry = REGEN_MAX_RETRY,
261 .max_desync_factor = MAX_DESYNC_FACTOR,
1da177e4 262 .max_addresses = IPV6_MAX_ADDRESSES,
65f5c7c1 263 .accept_ra_defrtr = 1,
6b2e04bc 264 .ra_defrtr_metric = IP6_RT_PRIO_USER,
d9333196 265 .accept_ra_from_local = 0,
8013d1d7 266 .accept_ra_min_hop_limit= 1,
c4fd30eb 267 .accept_ra_pinfo = 1,
930d6ff2
YH		 268#ifdef CONFIG_IPV6_ROUTER_PREF
269 .accept_ra_rtr_pref = 1,
52e16356 270 .rtr_probe_interval = 60 * HZ,
09c884d4 271#ifdef CONFIG_IPV6_ROUTE_INFO
bbea124b 272 .accept_ra_rt_info_min_plen = 0,
09c884d4
YH		 273 .accept_ra_rt_info_max_plen = 0,
274#endif
930d6ff2 275#endif
fbea49e1 276 .proxy_ndp = 0,
0bcbc926 277 .accept_source_route = 0, /* we do not accept RH0 by default. */
778d80be 278 .disable_ipv6 = 0,
1b34be74 279 .accept_dad = 1,
b800c3b9 280 .suppress_frag_ndisc = 1,
c2943f14 281 .accept_ra_mtu = 1,
3d1bec99
HFS		 282 .stable_secret = {
283 .initialized = false,
284 },
3985e8a3 285 .use_oif_addrs_only = 0,
35103d11 286 .ignore_routes_with_linkdown = 0,
f1705ec1 287 .keep_addr_on_down = 0,
1ababeba 288 .seg6_enabled = 0,
bf355b8d
DL		 289#ifdef CONFIG_IPV6_SEG6_HMAC
290 .seg6_require_hmac = 0,
291#endif
adc176c5 292 .enhanced_dad = 1,
d35a00b8 293 .addr_gen_mode = IN6_ADDR_GEN_MODE_EUI64,
df789fe7 294 .disable_policy = 0,
8610c7c6 295 .rpl_seg_enabled = 0,
1da177e4
LT		 296};
297
1f372c7b
MM		 298/* Check if link is ready: is it up and is a valid qdisc available */
299static inline bool addrconf_link_ready(const struct net_device *dev)
f24e3d65 300{
1f372c7b 301 return netif_oper_up(dev) && !qdisc_tx_is_noop(dev);
f24e3d65
MC		 302}
303
b7b1bfce 304static void addrconf_del_rs_timer(struct inet6_dev *idev)
1da177e4 305{
b7b1bfce
HFS		 306 if (del_timer(&idev->rs_timer))
307 __in6_dev_put(idev);
308}
309
c15b1cca 310static void addrconf_del_dad_work(struct inet6_ifaddr *ifp)
b7b1bfce 311{
c15b1cca 312 if (cancel_delayed_work(&ifp->dad_work))
1da177e4
LT		 313 __in6_ifa_put(ifp);
314}
315
b7b1bfce
HFS		 316static void addrconf_mod_rs_timer(struct inet6_dev *idev,
317 unsigned long when)
318{
319 if (!timer_pending(&idev->rs_timer))
320 in6_dev_hold(idev);
321 mod_timer(&idev->rs_timer, jiffies + when);
322}
1da177e4 323
c15b1cca
HFS		 324static void addrconf_mod_dad_work(struct inet6_ifaddr *ifp,
325 unsigned long delay)
1da177e4 326{
f8a894b2
XL		 327 in6_ifa_hold(ifp);
328 if (mod_delayed_work(addrconf_wq, &ifp->dad_work, delay))
329 in6_ifa_put(ifp);
1da177e4
LT		 330}
331
7f7d9a6b
HX		 332static int snmp6_alloc_dev(struct inet6_dev *idev)
333{
827da44c
JS		 334 int i;
335
698365fa
WC		 336 idev->stats.ipv6 = alloc_percpu(struct ipstats_mib);
337 if (!idev->stats.ipv6)
7f7d9a6b 338 goto err_ip;
827da44c
JS		 339
340 for_each_possible_cpu(i) {
341 struct ipstats_mib *addrconf_stats;
698365fa 342 addrconf_stats = per_cpu_ptr(idev->stats.ipv6, i);
827da44c 343 u64_stats_init(&addrconf_stats->syncp);
827da44c
JS		 344 }
345
346
be281e55
ED		 347 idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device),
348 GFP_KERNEL);
349 if (!idev->stats.icmpv6dev)
7f7d9a6b 350 goto err_icmp;
be281e55
ED		 351 idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device),
352 GFP_KERNEL);
353 if (!idev->stats.icmpv6msgdev)
14878f75 354 goto err_icmpmsg;
7f7d9a6b
HX		 355
356 return 0;
357
14878f75 358err_icmpmsg:
be281e55 359 kfree(idev->stats.icmpv6dev);
7f7d9a6b 360err_icmp:
698365fa 361 free_percpu(idev->stats.ipv6);
7f7d9a6b 362err_ip:
aaf70ec7 363 return -ENOMEM;
7f7d9a6b
HX		 364}
365
8e5e8f30 366static struct inet6_dev *ipv6_add_dev(struct net_device *dev)
1da177e4
LT		 367{
368 struct inet6_dev *ndev;
a317a2f1 369 int err = -ENOMEM;
1da177e4
LT		 370
371 ASSERT_RTNL();
372
373 if (dev->mtu < IPV6_MIN_MTU)
a317a2f1 374 return ERR_PTR(-EINVAL);
1da177e4 375
1ab1457c 376 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
63159f29 377 if (!ndev)
a317a2f1 378 return ERR_PTR(err);
322f74a4
IO		 379
380 rwlock_init(&ndev->lock);
381 ndev->dev = dev;
502a2ffd 382 INIT_LIST_HEAD(&ndev->addr_list);
e99e88a9 383 timer_setup(&ndev->rs_timer, addrconf_rs_timer, 0);
c346dca1 384 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf));
9b29c696
HFS		 385
386 if (ndev->cnf.stable_secret.initialized)
d35a00b8 387 ndev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
9b29c696 388
322f74a4 389 ndev->cnf.mtu6 = dev->mtu;
322f74a4 390 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
63159f29 391 if (!ndev->nd_parms) {
322f74a4 392 kfree(ndev);
a317a2f1 393 return ERR_PTR(err);
322f74a4 394 }
0187bdfb
BH		 395 if (ndev->cnf.forwarding)
396 dev_disable_lro(dev);
322f74a4
IO		 397 /* We refer to the device */
398 dev_hold(dev);
1da177e4 399
322f74a4 400 if (snmp6_alloc_dev(ndev) < 0) {
e32ac250
JP		 401 netdev_dbg(dev, "%s: cannot allocate memory for statistics\n",
402 __func__);
322f74a4 403 neigh_parms_release(&nd_tbl, ndev->nd_parms);
8603e33d
RL		 404 dev_put(dev);
405 kfree(ndev);
a317a2f1 406 return ERR_PTR(err);
322f74a4 407 }
1da177e4 408
322f74a4 409 if (snmp6_register_dev(ndev) < 0) {
e32ac250
JP		 410 netdev_dbg(dev, "%s: cannot create /proc/net/dev_snmp6/%s\n",
411 __func__, dev->name);
a317a2f1 412 goto err_release;
322f74a4
IO		 413 }
414
9d6280da 415 /* One reference from device. */
1be92460 416 refcount_set(&ndev->refcnt, 1);
1da177e4 417
1b34be74
YH		 418 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
419 ndev->cnf.accept_dad = -1;
420
07a93626 421#if IS_ENABLED(CONFIG_IPV6_SIT)
b077d7ab 422 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
f3213831 423 pr_info("%s: Disabled Multicast RS\n", dev->name);
b077d7ab
YH		 424 ndev->cnf.rtr_solicits = 0;
425 }
426#endif
427
372e6c8f 428 INIT_LIST_HEAD(&ndev->tempaddr_list);
76506a98 429 ndev->desync_factor = U32_MAX;
322f74a4
IO		 430 if ((dev->flags&IFF_LOOPBACK) ||
431 dev->type == ARPHRD_TUNNEL ||
9625ed72 432 dev->type == ARPHRD_TUNNEL6 ||
0be669bb 433 dev->type == ARPHRD_SIT ||
0be669bb 434 dev->type == ARPHRD_NONE) {
322f74a4 435 ndev->cnf.use_tempaddr = -1;
969c5464 436 }
5d9efa7e 437
914faa14 438 ndev->token = in6addr_any;
1da177e4 439
1f372c7b 440 if (netif_running(dev) && addrconf_link_ready(dev))
53aadcc9
HX		 441 ndev->if_flags |= IF_READY;
442
322f74a4
IO		 443 ipv6_mc_init_dev(ndev);
444 ndev->tstamp = jiffies;
a317a2f1
WC		 445 err = addrconf_sysctl_register(ndev);
446 if (err) {
447 ipv6_mc_destroy_dev(ndev);
2a189f9e 448 snmp6_unregister_dev(ndev);
a317a2f1
WC		 449 goto err_release;
450 }
30c4cf57 451 /* protected by rtnl_lock */
cf778b00 452 rcu_assign_pointer(dev->ip6_ptr, ndev);
d88ae4cc 453
2c5e8933
HFS		 454 /* Join interface-local all-node multicast group */
455 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allnodes);
456
d88ae4cc 457 /* Join all-node multicast group */
f3ee4010 458 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);
d88ae4cc 459
d6ddef9e 460 /* Join all-router multicast group if forwarding is set */
8b2aaede 461 if (ndev->cnf.forwarding && (dev->flags & IFF_MULTICAST))
d6ddef9e
LW		 462 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
463
1da177e4 464 return ndev;
a317a2f1
WC		 465
466err_release:
467 neigh_parms_release(&nd_tbl, ndev->nd_parms);
468 ndev->dead = 1;
469 in6_dev_finish_destroy(ndev);
470 return ERR_PTR(err);
1da177e4
LT		 471}
472
8e5e8f30 473static struct inet6_dev *ipv6_find_idev(struct net_device *dev)
1da177e4
LT		 474{
475 struct inet6_dev *idev;
476
477 ASSERT_RTNL();
478
e21e8467
SH		 479 idev = __in6_dev_get(dev);
480 if (!idev) {
481 idev = ipv6_add_dev(dev);
a317a2f1 482 if (IS_ERR(idev))
db0b99f5 483 return idev;
1da177e4 484 }
c5e33bdd 485
1da177e4
LT		 486 if (dev->flags&IFF_UP)
487 ipv6_mc_up(idev);
488 return idev;
489}
490
f3a1bfb1
ND		 491static int inet6_netconf_msgsize_devconf(int type)
492{
493 int size = NLMSG_ALIGN(sizeof(struct netconfmsg))
494 + nla_total_size(4); /* NETCONFA_IFINDEX */
136ba622 495 bool all = false;
f3a1bfb1 496
136ba622
ZS		 497 if (type == NETCONFA_ALL)
498 all = true;
499
500 if (all || type == NETCONFA_FORWARDING)
f3a1bfb1 501 size += nla_total_size(4);
b1afce95 502#ifdef CONFIG_IPV6_MROUTE
136ba622 503 if (all || type == NETCONFA_MC_FORWARDING)
d67b8c61 504 size += nla_total_size(4);
b1afce95 505#endif
136ba622 506 if (all || type == NETCONFA_PROXY_NEIGH)
c92d5491 507 size += nla_total_size(4);
f3a1bfb1 508
136ba622 509 if (all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN)
35103d11
AG		 510 size += nla_total_size(4);
511
f3a1bfb1
ND		 512 return size;
513}
514
515static int inet6_netconf_fill_devconf(struct sk_buff *skb, int ifindex,
516 struct ipv6_devconf *devconf, u32 portid,
517 u32 seq, int event, unsigned int flags,
518 int type)
519{
520 struct nlmsghdr *nlh;
521 struct netconfmsg *ncm;
136ba622 522 bool all = false;
f3a1bfb1
ND		 523
524 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg),
525 flags);
63159f29 526 if (!nlh)
f3a1bfb1
ND		 527 return -EMSGSIZE;
528
136ba622
ZS		 529 if (type == NETCONFA_ALL)
530 all = true;
531
f3a1bfb1
ND		 532 ncm = nlmsg_data(nlh);
533 ncm->ncm_family = AF_INET6;
534
535 if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0)
536 goto nla_put_failure;
537
23452170
DA		 538 if (!devconf)
539 goto out;
540
136ba622 541 if ((all || type == NETCONFA_FORWARDING) &&
f3a1bfb1
ND		 542 nla_put_s32(skb, NETCONFA_FORWARDING, devconf->forwarding) < 0)
543 goto nla_put_failure;
b1afce95 544#ifdef CONFIG_IPV6_MROUTE
136ba622 545 if ((all || type == NETCONFA_MC_FORWARDING) &&
d67b8c61
ND		 546 nla_put_s32(skb, NETCONFA_MC_FORWARDING,
547 devconf->mc_forwarding) < 0)
548 goto nla_put_failure;
b1afce95 549#endif
136ba622 550 if ((all || type == NETCONFA_PROXY_NEIGH) &&
c92d5491 551 nla_put_s32(skb, NETCONFA_PROXY_NEIGH, devconf->proxy_ndp) < 0)
552 goto nla_put_failure;
553
136ba622 554 if ((all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN) &&
35103d11
AG		 555 nla_put_s32(skb, NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
556 devconf->ignore_routes_with_linkdown) < 0)
557 goto nla_put_failure;
558
23452170 559out:
053c095a
JB		 560 nlmsg_end(skb, nlh);
561 return 0;
f3a1bfb1
ND		 562
563nla_put_failure:
564 nlmsg_cancel(skb, nlh);
565 return -EMSGSIZE;
566}
567
85b3daad
DA		 568void inet6_netconf_notify_devconf(struct net *net, int event, int type,
569 int ifindex, struct ipv6_devconf *devconf)
f3a1bfb1
ND		 570{
571 struct sk_buff *skb;
572 int err = -ENOBUFS;
573
927265bc 574 skb = nlmsg_new(inet6_netconf_msgsize_devconf(type), GFP_KERNEL);
63159f29 575 if (!skb)
f3a1bfb1
ND		 576 goto errout;
577
578 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 0, 0,
85b3daad 579 event, 0, type);
f3a1bfb1
ND		 580 if (err < 0) {
581 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
582 WARN_ON(err == -EMSGSIZE);
583 kfree_skb(skb);
584 goto errout;
585 }
927265bc 586 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_NETCONF, NULL, GFP_KERNEL);
f3a1bfb1
ND		 587 return;
588errout:
bd779028 589 rtnl_set_sk_err(net, RTNLGRP_IPV6_NETCONF, err);
f3a1bfb1
ND		 590}
591
76f8f6cb
ND		 592static const struct nla_policy devconf_ipv6_policy[NETCONFA_MAX+1] = {
593 [NETCONFA_IFINDEX] = { .len = sizeof(int) },
594 [NETCONFA_FORWARDING] = { .len = sizeof(int) },
c92d5491 595 [NETCONFA_PROXY_NEIGH] = { .len = sizeof(int) },
35103d11 596 [NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN] = { .len = sizeof(int) },
76f8f6cb
ND		 597};
598
38d51810
JK		 599static int inet6_netconf_valid_get_req(struct sk_buff *skb,
600 const struct nlmsghdr *nlh,
601 struct nlattr **tb,
602 struct netlink_ext_ack *extack)
603{
604 int i, err;
605
606 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(struct netconfmsg))) {
607 NL_SET_ERR_MSG_MOD(extack, "Invalid header for netconf get request");
608 return -EINVAL;
609 }
610
611 if (!netlink_strict_get_check(skb))
8cb08174
JB		 612 return nlmsg_parse_deprecated(nlh, sizeof(struct netconfmsg),
613 tb, NETCONFA_MAX,
614 devconf_ipv6_policy, extack);
38d51810 615
8cb08174
JB		 616 err = nlmsg_parse_deprecated_strict(nlh, sizeof(struct netconfmsg),
617 tb, NETCONFA_MAX,
618 devconf_ipv6_policy, extack);
38d51810
JK		 619 if (err)
620 return err;
621
622 for (i = 0; i <= NETCONFA_MAX; i++) {
623 if (!tb[i])
624 continue;
625
626 switch (i) {
627 case NETCONFA_IFINDEX:
628 break;
629 default:
630 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in netconf get request");
631 return -EINVAL;
632 }
633 }
634
635 return 0;
636}
637
76f8f6cb 638static int inet6_netconf_get_devconf(struct sk_buff *in_skb,
c21ef3e3
DA		 639 struct nlmsghdr *nlh,
640 struct netlink_ext_ack *extack)
76f8f6cb
ND		 641{
642 struct net *net = sock_net(in_skb->sk);
643 struct nlattr *tb[NETCONFA_MAX+1];
4ea2607f
FW		 644 struct inet6_dev *in6_dev = NULL;
645 struct net_device *dev = NULL;
76f8f6cb
ND		 646 struct sk_buff *skb;
647 struct ipv6_devconf *devconf;
76f8f6cb
ND		 648 int ifindex;
649 int err;
650
38d51810 651 err = inet6_netconf_valid_get_req(in_skb, nlh, tb, extack);
76f8f6cb 652 if (err < 0)
4ea2607f 653 return err;
76f8f6cb 654
76f8f6cb 655 if (!tb[NETCONFA_IFINDEX])
4ea2607f 656 return -EINVAL;
76f8f6cb 657
4ea2607f 658 err = -EINVAL;
76f8f6cb
ND		 659 ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]);
660 switch (ifindex) {
661 case NETCONFA_IFINDEX_ALL:
662 devconf = net->ipv6.devconf_all;
663 break;
664 case NETCONFA_IFINDEX_DEFAULT:
665 devconf = net->ipv6.devconf_dflt;
666 break;
667 default:
4ea2607f 668 dev = dev_get_by_index(net, ifindex);
63159f29 669 if (!dev)
4ea2607f
FW		 670 return -EINVAL;
671 in6_dev = in6_dev_get(dev);
63159f29 672 if (!in6_dev)
76f8f6cb
ND		 673 goto errout;
674 devconf = &in6_dev->cnf;
675 break;
676 }
677
678 err = -ENOBUFS;
4ea2607f 679 skb = nlmsg_new(inet6_netconf_msgsize_devconf(NETCONFA_ALL), GFP_KERNEL);
63159f29 680 if (!skb)
76f8f6cb
ND		 681 goto errout;
682
683 err = inet6_netconf_fill_devconf(skb, ifindex, devconf,
684 NETLINK_CB(in_skb).portid,
685 nlh->nlmsg_seq, RTM_NEWNETCONF, 0,
136ba622 686 NETCONFA_ALL);
76f8f6cb
ND		 687 if (err < 0) {
688 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
689 WARN_ON(err == -EMSGSIZE);
690 kfree_skb(skb);
691 goto errout;
692 }
693 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
694errout:
4ea2607f
FW		 695 if (in6_dev)
696 in6_dev_put(in6_dev);
697 if (dev)
698 dev_put(dev);
76f8f6cb
ND		 699 return err;
700}
701
7a674200
ND		 702static int inet6_netconf_dump_devconf(struct sk_buff *skb,
703 struct netlink_callback *cb)
704{
addd383f 705 const struct nlmsghdr *nlh = cb->nlh;
7a674200
ND		 706 struct net *net = sock_net(skb->sk);
707 int h, s_h;
708 int idx, s_idx;
709 struct net_device *dev;
710 struct inet6_dev *idev;
711 struct hlist_head *head;
712
addd383f
DA		 713 if (cb->strict_check) {
714 struct netlink_ext_ack *extack = cb->extack;
715 struct netconfmsg *ncm;
716
717 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ncm))) {
718 NL_SET_ERR_MSG_MOD(extack, "Invalid header for netconf dump request");
719 return -EINVAL;
720 }
721
722 if (nlmsg_attrlen(nlh, sizeof(*ncm))) {
723 NL_SET_ERR_MSG_MOD(extack, "Invalid data after header in netconf dump request");
724 return -EINVAL;
725 }
726 }
727
7a674200
ND		 728 s_h = cb->args[0];
729 s_idx = idx = cb->args[1];
730
731 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
732 idx = 0;
733 head = &net->dev_index_head[h];
734 rcu_read_lock();
63998ac2
ND		 735 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^
736 net->dev_base_seq;
7a674200
ND		 737 hlist_for_each_entry_rcu(dev, head, index_hlist) {
738 if (idx < s_idx)
739 goto cont;
740 idev = __in6_dev_get(dev);
741 if (!idev)
742 goto cont;
743
744 if (inet6_netconf_fill_devconf(skb, dev->ifindex,
745 &idev->cnf,
746 NETLINK_CB(cb->skb).portid,
addd383f 747 nlh->nlmsg_seq,
7a674200
ND		 748 RTM_NEWNETCONF,
749 NLM_F_MULTI,
136ba622 750 NETCONFA_ALL) < 0) {
7a674200
ND		 751 rcu_read_unlock();
752 goto done;
753 }
63998ac2 754 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
7a674200
ND		 755cont:
756 idx++;
757 }
758 rcu_read_unlock();
759 }
760 if (h == NETDEV_HASHENTRIES) {
761 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL,
762 net->ipv6.devconf_all,
763 NETLINK_CB(cb->skb).portid,
addd383f 764 nlh->nlmsg_seq,
7a674200 765 RTM_NEWNETCONF, NLM_F_MULTI,
136ba622 766 NETCONFA_ALL) < 0)
7a674200
ND		 767 goto done;
768 else
769 h++;
770 }
771 if (h == NETDEV_HASHENTRIES + 1) {
772 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT,
773 net->ipv6.devconf_dflt,
774 NETLINK_CB(cb->skb).portid,
addd383f 775 nlh->nlmsg_seq,
7a674200 776 RTM_NEWNETCONF, NLM_F_MULTI,
136ba622 777 NETCONFA_ALL) < 0)
7a674200
ND		 778 goto done;
779 else
780 h++;
781 }
782done:
783 cb->args[0] = h;
784 cb->args[1] = idx;
785
786 return skb->len;
787}
788
1da177e4
LT		 789#ifdef CONFIG_SYSCTL
790static void dev_forward_change(struct inet6_dev *idev)
791{
792 struct net_device *dev;
793 struct inet6_ifaddr *ifa;
1da177e4
LT		 794
795 if (!idev)
796 return;
797 dev = idev->dev;
0187bdfb
BH		 798 if (idev->cnf.forwarding)
799 dev_disable_lro(dev);
1a940835 800 if (dev->flags & IFF_MULTICAST) {
2c5e8933 801 if (idev->cnf.forwarding) {
f3ee4010 802 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
2c5e8933
HFS		 803 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allrouters);
804 ipv6_dev_mc_inc(dev, &in6addr_sitelocal_allrouters);
805 } else {
f3ee4010 806 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
2c5e8933
HFS		 807 ipv6_dev_mc_dec(dev, &in6addr_interfacelocal_allrouters);
808 ipv6_dev_mc_dec(dev, &in6addr_sitelocal_allrouters);
809 }
1da177e4 810 }
502a2ffd 811
812 list_for_each_entry(ifa, &idev->addr_list, if_list) {
2c12a74c
MW		 813 if (ifa->flags&IFA_F_TENTATIVE)
814 continue;
1da177e4
LT		 815 if (idev->cnf.forwarding)
816 addrconf_join_anycast(ifa);
817 else
818 addrconf_leave_anycast(ifa);
819 }
85b3daad
DA		 820 inet6_netconf_notify_devconf(dev_net(dev), RTM_NEWNETCONF,
821 NETCONFA_FORWARDING,
f3a1bfb1 822 dev->ifindex, &idev->cnf);
1da177e4
LT		 823}
824
825
e186932b 826static void addrconf_forward_change(struct net *net, __s32 newf)
1da177e4
LT		 827{
828 struct net_device *dev;
829 struct inet6_dev *idev;
830
4acd4945 831 for_each_netdev(net, dev) {
1da177e4
LT		 832 idev = __in6_dev_get(dev);
833 if (idev) {
e186932b
PE		 834 int changed = (!idev->cnf.forwarding) ^ (!newf);
835 idev->cnf.forwarding = newf;
1da177e4
LT		 836 if (changed)
837 dev_forward_change(idev);
838 }
1da177e4 839 }
1da177e4 840}
c8fecf22 841
013d97e9 842static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf)
c8fecf22 843{
bff16c2f 844 struct net *net;
013d97e9
FR		 845 int old;
846
847 if (!rtnl_trylock())
848 return restart_syscall();
bff16c2f
PE		 849
850 net = (struct net *)table->extra2;
013d97e9
FR		 851 old = *p;
852 *p = newf;
b325fddb 853
013d97e9 854 if (p == &net->ipv6.devconf_dflt->forwarding) {
f3a1bfb1 855 if ((!newf) ^ (!old))
85b3daad
DA		 856 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
857 NETCONFA_FORWARDING,
f3a1bfb1
ND		 858 NETCONFA_IFINDEX_DEFAULT,
859 net->ipv6.devconf_dflt);
013d97e9
FR		 860 rtnl_unlock();
861 return 0;
88af182e 862 }
c8fecf22 863
e186932b 864 if (p == &net->ipv6.devconf_all->forwarding) {
d26c638c
ND		 865 int old_dflt = net->ipv6.devconf_dflt->forwarding;
866
e186932b 867 net->ipv6.devconf_dflt->forwarding = newf;
d26c638c 868 if ((!newf) ^ (!old_dflt))
85b3daad
DA		 869 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
870 NETCONFA_FORWARDING,
d26c638c
ND		 871 NETCONFA_IFINDEX_DEFAULT,
872 net->ipv6.devconf_dflt);
873
e186932b 874 addrconf_forward_change(net, newf);
f3a1bfb1 875 if ((!newf) ^ (!old))
85b3daad
DA		 876 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
877 NETCONFA_FORWARDING,
f3a1bfb1
ND		 878 NETCONFA_IFINDEX_ALL,
879 net->ipv6.devconf_all);
013d97e9 880 } else if ((!newf) ^ (!old))
c8fecf22 881 dev_forward_change((struct inet6_dev *)table->extra1);
0187bdfb 882 rtnl_unlock();
c8fecf22 883
013d97e9 884 if (newf)
7b4da532 885 rt6_purge_dflt_routers(net);
b325fddb 886 return 1;
c8fecf22 887}
35103d11
AG		 888
889static void addrconf_linkdown_change(struct net *net, __s32 newf)
890{
891 struct net_device *dev;
892 struct inet6_dev *idev;
893
894 for_each_netdev(net, dev) {
895 idev = __in6_dev_get(dev);
896 if (idev) {
897 int changed = (!idev->cnf.ignore_routes_with_linkdown) ^ (!newf);
898
899 idev->cnf.ignore_routes_with_linkdown = newf;
900 if (changed)
901 inet6_netconf_notify_devconf(dev_net(dev),
85b3daad 902 RTM_NEWNETCONF,
35103d11
AG		 903 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
904 dev->ifindex,
905 &idev->cnf);
906 }
907 }
908}
909
910static int addrconf_fixup_linkdown(struct ctl_table *table, int *p, int newf)
911{
912 struct net *net;
913 int old;
914
915 if (!rtnl_trylock())
916 return restart_syscall();
917
918 net = (struct net *)table->extra2;
919 old = *p;
920 *p = newf;
921
922 if (p == &net->ipv6.devconf_dflt->ignore_routes_with_linkdown) {
923 if ((!newf) ^ (!old))
924 inet6_netconf_notify_devconf(net,
85b3daad 925 RTM_NEWNETCONF,
35103d11
AG		 926 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
927 NETCONFA_IFINDEX_DEFAULT,
928 net->ipv6.devconf_dflt);
929 rtnl_unlock();
930 return 0;
931 }
932
933 if (p == &net->ipv6.devconf_all->ignore_routes_with_linkdown) {
934 net->ipv6.devconf_dflt->ignore_routes_with_linkdown = newf;
935 addrconf_linkdown_change(net, newf);
936 if ((!newf) ^ (!old))
937 inet6_netconf_notify_devconf(net,
85b3daad 938 RTM_NEWNETCONF,
35103d11
AG		 939 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
940 NETCONFA_IFINDEX_ALL,
941 net->ipv6.devconf_all);
942 }
943 rtnl_unlock();
944
945 return 1;
946}
947
1da177e4
LT		 948#endif
949
5c578aed 950/* Nobody refers to this ifaddr, destroy it */
1da177e4
LT		 951void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
952{
c2e21293 953 WARN_ON(!hlist_unhashed(&ifp->addr_lst));
547b792c 954
1da177e4 955#ifdef NET_REFCNT_DEBUG
91df42be 956 pr_debug("%s\n", __func__);
1da177e4
LT		 957#endif
958
959 in6_dev_put(ifp->idev);
960
c15b1cca
HFS		 961 if (cancel_delayed_work(&ifp->dad_work))
962 pr_notice("delayed DAD work was pending while freeing ifa=%p\n",
963 ifp);
1da177e4 964
e9d3e084 965 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
f3213831 966 pr_warn("Freeing alive inet6 address %p\n", ifp);
1da177e4
LT		 967 return;
968 }
1da177e4 969
e5785985 970 kfree_rcu(ifp, rcu);
1da177e4
LT		 971}
972
e55ffac6
BH		 973static void
974ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
975{
502a2ffd 976 struct list_head *p;
8a6ce0c0 977 int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
e55ffac6
BH		 978
979 /*
980 * Each device address list is sorted in order of scope -
981 * global before linklocal.
982 */
502a2ffd 983 list_for_each(p, &idev->addr_list) {
984 struct inet6_ifaddr *ifa
985 = list_entry(p, struct inet6_ifaddr, if_list);
8a6ce0c0 986 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
e55ffac6
BH		 987 break;
988 }
989
8ef802aa 990 list_add_tail_rcu(&ifp->if_list, p);
e55ffac6
BH		 991}
992
3f27fb23 993static u32 inet6_addr_hash(const struct net *net, const struct in6_addr *addr)
3eb84f49 994{
3f27fb23
ED		 995 u32 val = ipv6_addr_hash(addr) ^ net_hash_mix(net);
996
997 return hash_32(val, IN6_ADDR_HSIZE_SHIFT);
3eb84f49
YH		 998}
999
56fc709b 1000static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
752a9292 1001 struct net_device *dev, unsigned int hash)
56fc709b 1002{
56fc709b
ED		 1003 struct inet6_ifaddr *ifp;
1004
1005 hlist_for_each_entry(ifp, &inet6_addr_lst[hash], addr_lst) {
1006 if (!net_eq(dev_net(ifp->idev->dev), net))
1007 continue;
1008 if (ipv6_addr_equal(&ifp->addr, addr)) {
1009 if (!dev || ifp->idev->dev == dev)
1010 return true;
1011 }
1012 }
1013 return false;
1014}
1015
f3d9832e
DA		 1016static int ipv6_add_addr_hash(struct net_device *dev, struct inet6_ifaddr *ifa)
1017{
3f27fb23 1018 unsigned int hash = inet6_addr_hash(dev_net(dev), &ifa->addr);
f3d9832e
DA		 1019 int err = 0;
1020
1021 spin_lock(&addrconf_hash_lock);
1022
1023 /* Ignore adding duplicate addresses on an interface */
752a9292 1024 if (ipv6_chk_same_addr(dev_net(dev), &ifa->addr, dev, hash)) {
e32ac250 1025 netdev_dbg(dev, "ipv6_add_addr: already assigned\n");
f3d9832e 1026 err = -EEXIST;
752a9292
ED		 1027 } else {
1028 hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]);
f3d9832e
DA		 1029 }
1030
f3d9832e
DA		 1031 spin_unlock(&addrconf_hash_lock);
1032
1033 return err;
1034}
1035
1da177e4
LT		 1036/* On success it returns ifp with increased reference count */
1037
1038static struct inet6_ifaddr *
e6464b8c 1039ipv6_add_addr(struct inet6_dev *idev, struct ifa6_config *cfg,
de95e047 1040 bool can_block, struct netlink_ext_ack *extack)
1da177e4 1041{
f3d9832e 1042 gfp_t gfp_flags = can_block ? GFP_KERNEL : GFP_ATOMIC;
e6464b8c 1043 int addr_type = ipv6_addr_type(cfg->pfx);
df789fe7 1044 struct net *net = dev_net(idev->dev);
1da177e4 1045 struct inet6_ifaddr *ifa = NULL;
360a9887 1046 struct fib6_info *f6i = NULL;
1da177e4 1047 int err = 0;
d68b8270
YH		 1048
1049 if (addr_type == IPV6_ADDR_ANY ||
f17f7648
HL		 1050 (addr_type & IPV6_ADDR_MULTICAST &&
1051 !(cfg->ifa_flags & IFA_F_MCAUTOJOIN)) ||
d68b8270 1052 (!(idev->dev->flags & IFF_LOOPBACK) &&
3ede0bbc 1053 !netif_is_l3_master(idev->dev) &&
d68b8270
YH		 1054 addr_type & IPV6_ADDR_LOOPBACK))
1055 return ERR_PTR(-EADDRNOTAVAIL);
1da177e4 1056
1da177e4
LT		 1057 if (idev->dead) {
1058 err = -ENODEV; /*XXX*/
f3d9832e 1059 goto out;
1da177e4
LT		 1060 }
1061
56d417b1 1062 if (idev->cnf.disable_ipv6) {
9bdd8d40 1063 err = -EACCES;
f3d9832e 1064 goto out;
9bdd8d40
BH		 1065 }
1066
ff7883ea
DA		 1067 /* validator notifier needs to be blocking;
1068 * do not call in atomic context
1069 */
1070 if (can_block) {
1071 struct in6_validator_info i6vi = {
e6464b8c 1072 .i6vi_addr = *cfg->pfx,
ff7883ea 1073 .i6vi_dev = idev,
de95e047 1074 .extack = extack,
ff7883ea
DA		 1075 };
1076
1077 err = inet6addr_validator_notifier_call_chain(NETDEV_UP, &i6vi);
1078 err = notifier_to_errno(err);
1079 if (err < 0)
1080 goto out;
1081 }
1da177e4 1082
f3d9832e 1083 ifa = kzalloc(sizeof(*ifa), gfp_flags);
63159f29 1084 if (!ifa) {
1da177e4
LT		 1085 err = -ENOBUFS;
1086 goto out;
1087 }
1088
e6464b8c 1089 f6i = addrconf_f6i_alloc(net, idev, cfg->pfx, false, gfp_flags);
360a9887
DA		 1090 if (IS_ERR(f6i)) {
1091 err = PTR_ERR(f6i);
1092 f6i = NULL;
1da177e4
LT		 1093 goto out;
1094 }
1095
df789fe7
DF		 1096 if (net->ipv6.devconf_all->disable_policy ||
1097 idev->cnf.disable_policy)
360a9887 1098 f6i->dst_nopolicy = true;
df789fe7 1099
bba24896
JP		 1100 neigh_parms_data_state_setall(idev->nd_parms);
1101
e6464b8c
DA		 1102 ifa->addr = *cfg->pfx;
1103 if (cfg->peer_pfx)
1104 ifa->peer_addr = *cfg->peer_pfx;
1da177e4
LT		 1105
1106 spin_lock_init(&ifa->lock);
c15b1cca 1107 INIT_DELAYED_WORK(&ifa->dad_work, addrconf_dad_work);
c2e21293 1108 INIT_HLIST_NODE(&ifa->addr_lst);
e6464b8c
DA		 1109 ifa->scope = cfg->scope;
1110 ifa->prefix_len = cfg->plen;
8308f3ff 1111 ifa->rt_priority = cfg->rt_priority;
e6464b8c 1112 ifa->flags = cfg->ifa_flags;
66eb9f86 1113 /* No need to add the TENTATIVE flag for addresses with NODAD */
e6464b8c 1114 if (!(cfg->ifa_flags & IFA_F_NODAD))
66eb9f86 1115 ifa->flags |= IFA_F_TENTATIVE;
e6464b8c
DA		 1116 ifa->valid_lft = cfg->valid_lft;
1117 ifa->prefered_lft = cfg->preferred_lft;
1da177e4 1118 ifa->cstamp = ifa->tstamp = jiffies;
617fe29d 1119 ifa->tokenized = false;
1da177e4 1120
360a9887 1121 ifa->rt = f6i;
57f5f544 1122
1da177e4 1123 ifa->idev = idev;
f3d9832e
DA		 1124 in6_dev_hold(idev);
1125
1da177e4 1126 /* For caller */
271201c0 1127 refcount_set(&ifa->refcnt, 1);
1da177e4 1128
f3d9832e 1129 rcu_read_lock_bh();
1da177e4 1130
f3d9832e
DA		 1131 err = ipv6_add_addr_hash(idev->dev, ifa);
1132 if (err < 0) {
1133 rcu_read_unlock_bh();
1134 goto out;
1135 }
1da177e4
LT		 1136
1137 write_lock(&idev->lock);
f3d9832e 1138
1da177e4 1139 /* Add to inet6_dev unicast addr list. */
e55ffac6 1140 ipv6_link_dev_addr(idev, ifa);
1da177e4 1141
1da177e4 1142 if (ifa->flags&IFA_F_TEMPORARY) {
372e6c8f 1143 list_add(&ifa->tmp_list, &idev->tempaddr_list);
1da177e4
LT		 1144 in6_ifa_hold(ifa);
1145 }
1da177e4 1146
1da177e4
LT		 1147 in6_ifa_hold(ifa);
1148 write_unlock(&idev->lock);
f3d9832e 1149
8814c4b5 1150 rcu_read_unlock_bh();
1da177e4 1151
f3d9832e
DA		 1152 inet6addr_notifier_call_chain(NETDEV_UP, ifa);
1153out:
1154 if (unlikely(err < 0)) {
360a9887 1155 fib6_info_release(f6i);
93531c67 1156
f3d9832e
DA		 1157 if (ifa) {
1158 if (ifa->idev)
1159 in6_dev_put(ifa->idev);
1160 kfree(ifa);
1161 }
1da177e4
LT		 1162 ifa = ERR_PTR(err);
1163 }
1164
1165 return ifa;
1da177e4
LT		 1166}
1167
5b84efec
TH		 1168enum cleanup_prefix_rt_t {
1169 CLEANUP_PREFIX_RT_NOP, /* no cleanup action for prefix route */
1170 CLEANUP_PREFIX_RT_DEL, /* delete the prefix route */
1171 CLEANUP_PREFIX_RT_EXPIRE, /* update the lifetime of the prefix route */
1172};
1173
1174/*
1175 * Check, whether the prefix for ifp would still need a prefix route
1176 * after deleting ifp. The function returns one of the CLEANUP_PREFIX_RT_*
1177 * constants.
1178 *
1179 * 1) we don't purge prefix if address was not permanent.
1180 * prefix is managed by its own lifetime.
1181 * 2) we also don't purge, if the address was IFA_F_NOPREFIXROUTE.
1182 * 3) if there are no addresses, delete prefix.
1183 * 4) if there are still other permanent address(es),
1184 * corresponding prefix is still permanent.
1185 * 5) if there are still other addresses with IFA_F_NOPREFIXROUTE,
1186 * don't purge the prefix, assume user space is managing it.
1187 * 6) otherwise, update prefix lifetime to the
1188 * longest valid lifetime among the corresponding
1189 * addresses on the device.
1190 * Note: subsequent RA will update lifetime.
1191 **/
1192static enum cleanup_prefix_rt_t
1193check_cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long *expires)
1194{
1195 struct inet6_ifaddr *ifa;
1196 struct inet6_dev *idev = ifp->idev;
1197 unsigned long lifetime;
1198 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_DEL;
1199
1200 *expires = jiffies;
1201
1202 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1203 if (ifa == ifp)
1204 continue;
e75913c9
ZL		 1205 if (ifa->prefix_len != ifp->prefix_len ||
1206 !ipv6_prefix_equal(&ifa->addr, &ifp->addr,
5b84efec
TH		 1207 ifp->prefix_len))
1208 continue;
1209 if (ifa->flags & (IFA_F_PERMANENT | IFA_F_NOPREFIXROUTE))
1210 return CLEANUP_PREFIX_RT_NOP;
1211
1212 action = CLEANUP_PREFIX_RT_EXPIRE;
1213
1214 spin_lock(&ifa->lock);
1215
1216 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
1217 /*
1218 * Note: Because this address is
1219 * not permanent, lifetime <
1220 * LONG_MAX / HZ here.
1221 */
1222 if (time_before(*expires, ifa->tstamp + lifetime * HZ))
1223 *expires = ifa->tstamp + lifetime * HZ;
1224 spin_unlock(&ifa->lock);
1225 }
1226
1227 return action;
1228}
1229
1230static void
d0098e4c
HL		 1231cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long expires,
1232 bool del_rt, bool del_peer)
5b84efec 1233{
93c2fb25 1234 struct fib6_info *f6i;
5b84efec 1235
d0098e4c
HL		 1236 f6i = addrconf_get_prefix_route(del_peer ? &ifp->peer_addr : &ifp->addr,
1237 ifp->prefix_len,
2b2450ca 1238 ifp->idev->dev, 0, RTF_DEFAULT, true);
93c2fb25 1239 if (f6i) {
5b84efec 1240 if (del_rt)
11dd74b3 1241 ip6_del_rt(dev_net(ifp->idev->dev), f6i, false);
5b84efec 1242 else {
93c2fb25
DA		 1243 if (!(f6i->fib6_flags & RTF_EXPIRES))
1244 fib6_set_expires(f6i, expires);
1245 fib6_info_release(f6i);
5b84efec
TH		 1246 }
1247 }
1248}
1249
1250
1da177e4
LT		 1251/* This function wants to get referenced ifp and releases it before return */
1252
1253static void ipv6_del_addr(struct inet6_ifaddr *ifp)
1254{
4c5ff6a6 1255 int state;
5b84efec
TH		 1256 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_NOP;
1257 unsigned long expires;
1da177e4 1258
c15b1cca
HFS		 1259 ASSERT_RTNL();
1260
8e8e676d 1261 spin_lock_bh(&ifp->lock);
4c5ff6a6 1262 state = ifp->state;
e9d3e084 1263 ifp->state = INET6_IFADDR_STATE_DEAD;
8e8e676d 1264 spin_unlock_bh(&ifp->lock);
4c5ff6a6
HX		 1265
1266 if (state == INET6_IFADDR_STATE_DEAD)
1267 goto out;
1da177e4 1268
5c578aed 1269 spin_lock_bh(&addrconf_hash_lock);
1270 hlist_del_init_rcu(&ifp->addr_lst);
5c578aed 1271 spin_unlock_bh(&addrconf_hash_lock);
1da177e4 1272
5b84efec 1273 write_lock_bh(&ifp->idev->lock);
5d9efa7e 1274
1da177e4 1275 if (ifp->flags&IFA_F_TEMPORARY) {
372e6c8f 1276 list_del(&ifp->tmp_list);
1277 if (ifp->ifpub) {
1278 in6_ifa_put(ifp->ifpub);
1279 ifp->ifpub = NULL;
1da177e4 1280 }
372e6c8f 1281 __in6_ifa_put(ifp);
1da177e4 1282 }
1da177e4 1283
5b84efec
TH		 1284 if (ifp->flags & IFA_F_PERMANENT && !(ifp->flags & IFA_F_NOPREFIXROUTE))
1285 action = check_cleanup_prefix_route(ifp, &expires);
502a2ffd 1286
8ef802aa 1287 list_del_rcu(&ifp->if_list);
5b84efec
TH		 1288 __in6_ifa_put(ifp);
1289
1290 write_unlock_bh(&ifp->idev->lock);
1da177e4 1291
c15b1cca 1292 addrconf_del_dad_work(ifp);
b2238566 1293
1da177e4
LT		 1294 ipv6_ifa_notify(RTM_DELADDR, ifp);
1295
f88c91dd 1296 inet6addr_notifier_call_chain(NETDEV_DOWN, ifp);
1da177e4 1297
5b84efec
TH		 1298 if (action != CLEANUP_PREFIX_RT_NOP) {
1299 cleanup_prefix_route(ifp, expires,
d0098e4c 1300 action == CLEANUP_PREFIX_RT_DEL, false);
1da177e4
LT		 1301 }
1302
c3968a85
DW		 1303 /* clean up prefsrc entries */
1304 rt6_remove_prefsrc(ifp);
4c5ff6a6 1305out:
1da177e4
LT		 1306 in6_ifa_put(ifp);
1307}
1308
969c5464 1309static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, bool block)
1da177e4
LT		 1310{
1311 struct inet6_dev *idev = ifp->idev;
e6464b8c 1312 unsigned long tmp_tstamp, age;
eac55bf9 1313 unsigned long regen_advance;
76f793e3 1314 unsigned long now = jiffies;
7aa8e63f 1315 s32 cnf_temp_preferred_lft;
969c5464
FG		 1316 struct inet6_ifaddr *ift;
1317 struct ifa6_config cfg;
1318 long max_desync_factor;
1319 struct in6_addr addr;
1320 int ret = 0;
1da177e4 1321
53bd6749 1322 write_lock_bh(&idev->lock);
969c5464 1323
1da177e4
LT		 1324retry:
1325 in6_dev_hold(idev);
1326 if (idev->cnf.use_tempaddr <= 0) {
53bd6749 1327 write_unlock_bh(&idev->lock);
f3213831 1328 pr_info("%s: use_tempaddr is disabled\n", __func__);
1da177e4
LT		 1329 in6_dev_put(idev);
1330 ret = -1;
1331 goto out;
1332 }
1333 spin_lock_bh(&ifp->lock);
1334 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
1335 idev->cnf.use_tempaddr = -1; /*XXX*/
1336 spin_unlock_bh(&ifp->lock);
53bd6749 1337 write_unlock_bh(&idev->lock);
f3213831
JP		 1338 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n",
1339 __func__);
1da177e4
LT		 1340 in6_dev_put(idev);
1341 ret = -1;
1342 goto out;
1343 }
1344 in6_ifa_hold(ifp);
1345 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
969c5464
FG		 1346 ipv6_gen_rnd_iid(&addr);
1347
76f793e3 1348 age = (now - ifp->tstamp) / HZ;
76506a98
JB		 1349
1350 regen_advance = idev->cnf.regen_max_retry *
1351 idev->cnf.dad_transmits *
19e16d22 1352 max(NEIGH_VAR(idev->nd_parms, RETRANS_TIME), HZ/100) / HZ;
76506a98
JB		 1353
1354 /* recalculate max_desync_factor each time and update
1355 * idev->desync_factor if it's larger
1356 */
7aa8e63f 1357 cnf_temp_preferred_lft = READ_ONCE(idev->cnf.temp_prefered_lft);
76506a98
JB		 1358 max_desync_factor = min_t(__u32,
1359 idev->cnf.max_desync_factor,
7aa8e63f 1360 cnf_temp_preferred_lft - regen_advance);
76506a98
JB		 1361
1362 if (unlikely(idev->desync_factor > max_desync_factor)) {
1363 if (max_desync_factor > 0) {
1364 get_random_bytes(&idev->desync_factor,
1365 sizeof(idev->desync_factor));
1366 idev->desync_factor %= max_desync_factor;
1367 } else {
1368 idev->desync_factor = 0;
1369 }
1370 }
1371
3f2d67b6 1372 memset(&cfg, 0, sizeof(cfg));
e6464b8c 1373 cfg.valid_lft = min_t(__u32, ifp->valid_lft,
7a876b0e 1374 idev->cnf.temp_valid_lft + age);
e6464b8c
DA		 1375 cfg.preferred_lft = cnf_temp_preferred_lft + age - idev->desync_factor;
1376 cfg.preferred_lft = min_t(__u32, ifp->prefered_lft, cfg.preferred_lft);
1377
1378 cfg.plen = ifp->prefix_len;
1da177e4
LT		 1379 tmp_tstamp = ifp->tstamp;
1380 spin_unlock_bh(&ifp->lock);
1381
53bd6749 1382 write_unlock_bh(&idev->lock);
95c385b4 1383
eac55bf9
BB		 1384 /* A temporary address is created only if this calculated Preferred
1385 * Lifetime is greater than REGEN_ADVANCE time units. In particular,
1386 * an implementation must not create a temporary address with a zero
1387 * Preferred Lifetime.
ecab6701
HK		 1388 * Use age calculation as in addrconf_verify to avoid unnecessary
1389 * temporary addresses being generated.
eac55bf9 1390 */
ecab6701 1391 age = (now - tmp_tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
e6464b8c 1392 if (cfg.preferred_lft <= regen_advance + age) {
eac55bf9
BB		 1393 in6_ifa_put(ifp);
1394 in6_dev_put(idev);
1395 ret = -1;
1396 goto out;
1397 }
1398
e6464b8c 1399 cfg.ifa_flags = IFA_F_TEMPORARY;
95c385b4
NH		 1400 /* set in addrconf_prefix_rcv() */
1401 if (ifp->flags & IFA_F_OPTIMISTIC)
e6464b8c 1402 cfg.ifa_flags |= IFA_F_OPTIMISTIC;
95c385b4 1403
e6464b8c
DA		 1404 cfg.pfx = &addr;
1405 cfg.scope = ipv6_addr_scope(cfg.pfx);
95c385b4 1406
e6464b8c 1407 ift = ipv6_add_addr(idev, &cfg, block, NULL);
4b08a8f1 1408 if (IS_ERR(ift)) {
1da177e4
LT		 1409 in6_ifa_put(ifp);
1410 in6_dev_put(idev);
f3213831 1411 pr_info("%s: retry temporary address regeneration\n", __func__);
53bd6749 1412 write_lock_bh(&idev->lock);
1da177e4
LT		 1413 goto retry;
1414 }
1415
1416 spin_lock_bh(&ift->lock);
1417 ift->ifpub = ifp;
76f793e3 1418 ift->cstamp = now;
1da177e4
LT		 1419 ift->tstamp = tmp_tstamp;
1420 spin_unlock_bh(&ift->lock);
1421
cf22f9a2 1422 addrconf_dad_start(ift);
1da177e4
LT		 1423 in6_ifa_put(ift);
1424 in6_dev_put(idev);
1425out:
1426 return ret;
1427}
1da177e4
LT		 1428
1429/*
072047e4 1430 * Choose an appropriate source address (RFC3484)
1da177e4 1431 */
a9b05723
YH		 1432enum {
1433 IPV6_SADDR_RULE_INIT = 0,
1434 IPV6_SADDR_RULE_LOCAL,
1435 IPV6_SADDR_RULE_SCOPE,
1436 IPV6_SADDR_RULE_PREFERRED,
1437#ifdef CONFIG_IPV6_MIP6
1438 IPV6_SADDR_RULE_HOA,
1439#endif
1440 IPV6_SADDR_RULE_OIF,
1441 IPV6_SADDR_RULE_LABEL,
a9b05723 1442 IPV6_SADDR_RULE_PRIVACY,
a9b05723
YH		 1443 IPV6_SADDR_RULE_ORCHID,
1444 IPV6_SADDR_RULE_PREFIX,
7fd2561e
EK		 1445#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1446 IPV6_SADDR_RULE_NOT_OPTIMISTIC,
1447#endif
a9b05723
YH		 1448 IPV6_SADDR_RULE_MAX
1449};
1450
072047e4 1451struct ipv6_saddr_score {
a9b05723
YH		 1452 int rule;
1453 int addr_type;
1454 struct inet6_ifaddr *ifa;
1455 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
1456 int scopedist;
1457 int matchlen;
072047e4
YH		 1458};
1459
a9b05723 1460struct ipv6_saddr_dst {
9acd9f3a 1461 const struct in6_addr *addr;
a9b05723
YH		 1462 int ifindex;
1463 int scope;
1464 int label;
7cbca67c 1465 unsigned int prefs;
a9b05723 1466};
072047e4 1467
b6f99a21 1468static inline int ipv6_saddr_preferred(int type)
1da177e4 1469{
45bb0060 1470 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
072047e4
YH		 1471 return 1;
1472 return 0;
1da177e4
LT		 1473}
1474
35e015e1
MC		 1475static bool ipv6_use_optimistic_addr(struct net *net,
1476 struct inet6_dev *idev)
7fd2561e
EK		 1477{
1478#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
35e015e1
MC		 1479 if (!idev)
1480 return false;
1481 if (!net->ipv6.devconf_all->optimistic_dad && !idev->cnf.optimistic_dad)
1482 return false;
1483 if (!net->ipv6.devconf_all->use_optimistic && !idev->cnf.use_optimistic)
1484 return false;
1485
1486 return true;
7fd2561e
EK		 1487#else
1488 return false;
1489#endif
1490}
1491
f1c02cfb
SD		 1492static bool ipv6_allow_optimistic_dad(struct net *net,
1493 struct inet6_dev *idev)
1494{
1495#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1496 if (!idev)
1497 return false;
1498 if (!net->ipv6.devconf_all->optimistic_dad && !idev->cnf.optimistic_dad)
1499 return false;
1500
1501 return true;
1502#else
1503 return false;
1504#endif
1505}
1506
3de23255
BT		 1507static int ipv6_get_saddr_eval(struct net *net,
1508 struct ipv6_saddr_score *score,
a9b05723
YH		 1509 struct ipv6_saddr_dst *dst,
1510 int i)
1511{
1512 int ret;
1513
1514 if (i <= score->rule) {
1515 switch (i) {
1516 case IPV6_SADDR_RULE_SCOPE:
1517 ret = score->scopedist;
1518 break;
1519 case IPV6_SADDR_RULE_PREFIX:
1520 ret = score->matchlen;
1521 break;
1522 default:
1523 ret = !!test_bit(i, score->scorebits);
1524 }
1525 goto out;
1526 }
1527
1528 switch (i) {
1529 case IPV6_SADDR_RULE_INIT:
1530 /* Rule 0: remember if hiscore is not ready yet */
1531 ret = !!score->ifa;
1532 break;
1533 case IPV6_SADDR_RULE_LOCAL:
1534 /* Rule 1: Prefer same address */
1535 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1536 break;
1537 case IPV6_SADDR_RULE_SCOPE:
1538 /* Rule 2: Prefer appropriate scope
1539 *
1540 * ret
1541 * ^
1542 * -1 | d 15
1543 * ---+--+-+---> scope
1544 * |
1545 * | d is scope of the destination.
1546 * B-d | \
1547 * | \ <- smaller scope is better if
db9c7c39 1548 * B-15 | \ if scope is enough for destination.
a9b05723
YH		 1549 * | ret = B - scope (-1 <= scope >= d <= 15).
1550 * d-C-1 | /
1551 * |/ <- greater is better
1552 * -C / if scope is not enough for destination.
1553 * /| ret = scope - C (-1 <= d < scope <= 15).
1554 *
1555 * d - C - 1 < B -15 (for all -1 <= d <= 15).
1556 * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1557 * Assume B = 0 and we get C > 29.
1558 */
1559 ret = __ipv6_addr_src_scope(score->addr_type);
1560 if (ret >= dst->scope)
1561 ret = -ret;
1562 else
1563 ret -= 128; /* 30 is enough */
1564 score->scopedist = ret;
1565 break;
1566 case IPV6_SADDR_RULE_PREFERRED:
7fd2561e 1567 {
a9b05723 1568 /* Rule 3: Avoid deprecated and optimistic addresses */
7fd2561e
EK		 1569 u8 avoid = IFA_F_DEPRECATED;
1570
35e015e1 1571 if (!ipv6_use_optimistic_addr(net, score->ifa->idev))
7fd2561e 1572 avoid |= IFA_F_OPTIMISTIC;
a9b05723 1573 ret = ipv6_saddr_preferred(score->addr_type) ||
7fd2561e 1574 !(score->ifa->flags & avoid);
a9b05723 1575 break;
7fd2561e 1576 }
a9b05723
YH		 1577#ifdef CONFIG_IPV6_MIP6
1578 case IPV6_SADDR_RULE_HOA:
7cbca67c 1579 {
a9b05723 1580 /* Rule 4: Prefer home address */
7cbca67c
YH		 1581 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1582 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
a9b05723 1583 break;
7cbca67c 1584 }
a9b05723
YH		 1585#endif
1586 case IPV6_SADDR_RULE_OIF:
1587 /* Rule 5: Prefer outgoing interface */
1588 ret = (!dst->ifindex ||
1589 dst->ifindex == score->ifa->idev->dev->ifindex);
1590 break;
1591 case IPV6_SADDR_RULE_LABEL:
1592 /* Rule 6: Prefer matching label */
3de23255
BT		 1593 ret = ipv6_addr_label(net,
1594 &score->ifa->addr, score->addr_type,
a9b05723
YH		 1595 score->ifa->idev->dev->ifindex) == dst->label;
1596 break;
a9b05723 1597 case IPV6_SADDR_RULE_PRIVACY:
7cbca67c 1598 {
a9b05723 1599 /* Rule 7: Prefer public address
25985edc 1600 * Note: prefer temporary address if use_tempaddr >= 2
a9b05723 1601 */
7cbca67c
YH		 1602 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1603 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1604 score->ifa->idev->cnf.use_tempaddr >= 2;
1605 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
a9b05723 1606 break;
7cbca67c 1607 }
a9b05723
YH		 1608 case IPV6_SADDR_RULE_ORCHID:
1609 /* Rule 8-: Prefer ORCHID vs ORCHID or
1610 * non-ORCHID vs non-ORCHID
1611 */
1612 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1613 ipv6_addr_orchid(dst->addr));
1614 break;
1615 case IPV6_SADDR_RULE_PREFIX:
1616 /* Rule 8: Use longest matching prefix */
91b4b04f
YH		 1617 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr);
1618 if (ret > score->ifa->prefix_len)
1619 ret = score->ifa->prefix_len;
1620 score->matchlen = ret;
a9b05723 1621 break;
7fd2561e
EK		 1622#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1623 case IPV6_SADDR_RULE_NOT_OPTIMISTIC:
1624 /* Optimistic addresses still have lower precedence than other
1625 * preferred addresses.
1626 */
1627 ret = !(score->ifa->flags & IFA_F_OPTIMISTIC);
1628 break;
1629#endif
a9b05723
YH		 1630 default:
1631 ret = 0;
1632 }
1633
1634 if (ret)
1635 __set_bit(i, score->scorebits);
1636 score->rule = i;
1637out:
1638 return ret;
1639}
1640
c0b8da1e
YH		 1641static int __ipv6_dev_get_saddr(struct net *net,
1642 struct ipv6_saddr_dst *dst,
c0b8da1e
YH		 1643 struct inet6_dev *idev,
1644 struct ipv6_saddr_score *scores,
1645 int hiscore_idx)
9131f3de 1646{
c0b8da1e 1647 struct ipv6_saddr_score *score = &scores[1 - hiscore_idx], *hiscore = &scores[hiscore_idx];
9131f3de 1648
f59c031e 1649 list_for_each_entry_rcu(score->ifa, &idev->addr_list, if_list) {
9131f3de
YH		 1650 int i;
1651
1652 /*
1653 * - Tentative Address (RFC2462 section 5.4)
1654 * - A tentative address is not considered
1655 * "assigned to an interface" in the traditional
1656 * sense, unless it is also flagged as optimistic.
1657 * - Candidate Source Address (section 4)
1658 * - In any case, anycast addresses, multicast
1659 * addresses, and the unspecified address MUST
1660 * NOT be included in a candidate set.
1661 */
1662 if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1663 (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
1664 continue;
1665
1666 score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1667
1668 if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1669 score->addr_type & IPV6_ADDR_MULTICAST)) {
1670 net_dbg_ratelimited("ADDRCONF: unspecified / multicast address assigned as unicast address on %s",
1671 idev->dev->name);
1672 continue;
1673 }
1674
1675 score->rule = -1;
1676 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1677
1678 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1679 int minihiscore, miniscore;
1680
1681 minihiscore = ipv6_get_saddr_eval(net, hiscore, dst, i);
1682 miniscore = ipv6_get_saddr_eval(net, score, dst, i);
1683
1684 if (minihiscore > miniscore) {
1685 if (i == IPV6_SADDR_RULE_SCOPE &&
1686 score->scopedist > 0) {
1687 /*
1688 * special case:
1689 * each remaining entry
1690 * has too small (not enough)
1691 * scope, because ifa entries
1692 * are sorted by their scope
1693 * values.
1694 */
1695 goto out;
1696 }
1697 break;
1698 } else if (minihiscore < miniscore) {
9131f3de 1699 swap(hiscore, score);
c0b8da1e 1700 hiscore_idx = 1 - hiscore_idx;
9131f3de
YH		 1701
1702 /* restore our iterator */
1703 score->ifa = hiscore->ifa;
1704
1705 break;
1706 }
1707 }
1708 }
1709out:
c0b8da1e 1710 return hiscore_idx;
9131f3de
YH		 1711}
1712
afbac601
DA		 1713static int ipv6_get_saddr_master(struct net *net,
1714 const struct net_device *dst_dev,
1715 const struct net_device *master,
1716 struct ipv6_saddr_dst *dst,
1717 struct ipv6_saddr_score *scores,
1718 int hiscore_idx)
1719{
1720 struct inet6_dev *idev;
1721
1722 idev = __in6_dev_get(dst_dev);
1723 if (idev)
1724 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev,
1725 scores, hiscore_idx);
1726
1727 idev = __in6_dev_get(master);
1728 if (idev)
1729 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev,
1730 scores, hiscore_idx);
1731
1732 return hiscore_idx;
1733}
1734
b3f644fc 1735int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev,
9acd9f3a 1736 const struct in6_addr *daddr, unsigned int prefs,
7cbca67c 1737 struct in6_addr *saddr)
1da177e4 1738{
c0b8da1e 1739 struct ipv6_saddr_score scores[2], *hiscore;
a9b05723 1740 struct ipv6_saddr_dst dst;
9131f3de 1741 struct inet6_dev *idev;
072047e4 1742 struct net_device *dev;
a9b05723 1743 int dst_type;
9131f3de 1744 bool use_oif_addr = false;
c0b8da1e 1745 int hiscore_idx = 0;
cc429c8f 1746 int ret = 0;
1da177e4 1747
a9b05723
YH		 1748 dst_type = __ipv6_addr_type(daddr);
1749 dst.addr = daddr;
1750 dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1751 dst.scope = __ipv6_addr_src_scope(dst_type);
3de23255 1752 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
7cbca67c 1753 dst.prefs = prefs;
a9b05723 1754
c0b8da1e
YH		 1755 scores[hiscore_idx].rule = -1;
1756 scores[hiscore_idx].ifa = NULL;
1da177e4 1757
8814c4b5 1758 rcu_read_lock();
1da177e4 1759
9131f3de
YH		 1760 /* Candidate Source Address (section 4)
1761 * - multicast and link-local destination address,
1762 * the set of candidate source address MUST only
1763 * include addresses assigned to interfaces
1764 * belonging to the same link as the outgoing
1765 * interface.
1766 * (- For site-local destination addresses, the
1767 * set of candidate source addresses MUST only
1768 * include addresses assigned to interfaces
1769 * belonging to the same site as the outgoing
1770 * interface.)
3985e8a3
EK		 1771 * - "It is RECOMMENDED that the candidate source addresses
1772 * be the set of unicast addresses assigned to the
1773 * interface that will be used to send to the destination
1774 * (the 'outgoing' interface)." (RFC 6724)
9131f3de
YH		 1775 */
1776 if (dst_dev) {
3985e8a3 1777 idev = __in6_dev_get(dst_dev);
9131f3de 1778 if ((dst_type & IPV6_ADDR_MULTICAST) ||
3985e8a3
EK		 1779 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL ||
1780 (idev && idev->cnf.use_oif_addrs_only)) {
9131f3de
YH		 1781 use_oif_addr = true;
1782 }
1783 }
a9b05723 1784
9131f3de 1785 if (use_oif_addr) {
c0b8da1e 1786 if (idev)
c15df306 1787 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx);
9131f3de 1788 } else {
afbac601
DA		 1789 const struct net_device *master;
1790 int master_idx = 0;
1791
1792 /* if dst_dev exists and is enslaved to an L3 device, then
1793 * prefer addresses from dst_dev and then the master over
1794 * any other enslaved devices in the L3 domain.
1795 */
1796 master = l3mdev_master_dev_rcu(dst_dev);
1797 if (master) {
1798 master_idx = master->ifindex;
1799
1800 hiscore_idx = ipv6_get_saddr_master(net, dst_dev,
1801 master, &dst,
1802 scores, hiscore_idx);
1803
1804 if (scores[hiscore_idx].ifa)
1805 goto out;
1806 }
1807
9131f3de 1808 for_each_netdev_rcu(net, dev) {
afbac601
DA		 1809 /* only consider addresses on devices in the
1810 * same L3 domain
1811 */
1812 if (l3mdev_master_ifindex_rcu(dev) != master_idx)
1813 continue;
9131f3de
YH		 1814 idev = __in6_dev_get(dev);
1815 if (!idev)
072047e4 1816 continue;
c15df306 1817 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx);
1da177e4
LT		 1818 }
1819 }
afbac601
DA		 1820
1821out:
c0b8da1e 1822 hiscore = &scores[hiscore_idx];
a9b05723 1823 if (!hiscore->ifa)
cc429c8f
ED		 1824 ret = -EADDRNOTAVAIL;
1825 else
1826 *saddr = hiscore->ifa->addr;
1ab1457c 1827
cc429c8f
ED		 1828 rcu_read_unlock();
1829 return ret;
1da177e4 1830}
5e5f3f0f 1831EXPORT_SYMBOL(ipv6_dev_get_saddr);
1da177e4 1832
8965779d 1833int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr,
479840ff 1834 u32 banned_flags)
b7b1bfce
HFS		 1835{
1836 struct inet6_ifaddr *ifp;
1837 int err = -EADDRNOTAVAIL;
1838
602582ca
HFS		 1839 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
1840 if (ifp->scope > IFA_LINK)
1841 break;
b7b1bfce
HFS		 1842 if (ifp->scope == IFA_LINK &&
1843 !(ifp->flags & banned_flags)) {
1844 *addr = ifp->addr;
1845 err = 0;
1846 break;
1847 }
1848 }
1849 return err;
1850}
1851
95c385b4 1852int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
479840ff 1853 u32 banned_flags)
1da177e4
LT		 1854{
1855 struct inet6_dev *idev;
1856 int err = -EADDRNOTAVAIL;
1857
8814c4b5 1858 rcu_read_lock();
e21e8467
SH		 1859 idev = __in6_dev_get(dev);
1860 if (idev) {
1da177e4 1861 read_lock_bh(&idev->lock);
b7b1bfce 1862 err = __ipv6_get_lladdr(idev, addr, banned_flags);
1da177e4
LT		 1863 read_unlock_bh(&idev->lock);
1864 }
8814c4b5 1865 rcu_read_unlock();
1da177e4
LT		 1866 return err;
1867}
1868
d9bf82c2 1869static int ipv6_count_addresses(const struct inet6_dev *idev)
1da177e4 1870{
d9bf82c2 1871 const struct inet6_ifaddr *ifp;
1da177e4 1872 int cnt = 0;
1da177e4 1873
d9bf82c2
ED		 1874 rcu_read_lock();
1875 list_for_each_entry_rcu(ifp, &idev->addr_list, if_list)
1da177e4 1876 cnt++;
d9bf82c2 1877 rcu_read_unlock();
1da177e4
LT		 1878 return cnt;
1879}
1880
b71d1d42 1881int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
2a7851bf 1882 const struct net_device *dev, int strict)
c58da4c6 1883{
232378e8
DA		 1884 return ipv6_chk_addr_and_flags(net, addr, dev, !dev,
1885 strict, IFA_F_TENTATIVE);
c58da4c6
EK		 1886}
1887EXPORT_SYMBOL(ipv6_chk_addr);
1888
1893ff20
DA		 1889/* device argument is used to find the L3 domain of interest. If
1890 * skip_dev_check is set, then the ifp device is not checked against
1891 * the passed in dev argument. So the 2 cases for addresses checks are:
1892 * 1. does the address exist in the L3 domain that dev is part of
1893 * (skip_dev_check = true), or
1894 *
1895 * 2. does the address exist on the specific device
1896 * (skip_dev_check = false)
1897 */
4ef1a7cb
XL		 1898static struct net_device *
1899__ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr,
1900 const struct net_device *dev, bool skip_dev_check,
1901 int strict, u32 banned_flags)
1da177e4 1902{
3f27fb23 1903 unsigned int hash = inet6_addr_hash(net, addr);
4ef1a7cb 1904 struct net_device *l3mdev, *ndev;
eedf042a 1905 struct inet6_ifaddr *ifp;
c58da4c6 1906 u32 ifp_flags;
1da177e4 1907
480318a0 1908 rcu_read_lock();
232378e8 1909
1893ff20 1910 l3mdev = l3mdev_master_dev_rcu(dev);
232378e8
DA		 1911 if (skip_dev_check)
1912 dev = NULL;
1913
b67bfe0d 1914 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
4ef1a7cb
XL		 1915 ndev = ifp->idev->dev;
1916 if (!net_eq(dev_net(ndev), net))
bfeade08 1917 continue;
1893ff20 1918
4ef1a7cb 1919 if (l3mdev_master_dev_rcu(ndev) != l3mdev)
1893ff20
DA		 1920 continue;
1921
c58da4c6
EK		 1922 /* Decouple optimistic from tentative for evaluation here.
1923 * Ban optimistic addresses explicitly, when required.
1924 */
1925 ifp_flags = (ifp->flags&IFA_F_OPTIMISTIC)
1926 ? (ifp->flags&~IFA_F_TENTATIVE)
1927 : ifp->flags;
1da177e4 1928 if (ipv6_addr_equal(&ifp->addr, addr) &&
c58da4c6 1929 !(ifp_flags&banned_flags) &&
4ef1a7cb 1930 (!dev || ndev == dev ||
eedf042a 1931 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) {
480318a0 1932 rcu_read_unlock();
4ef1a7cb 1933 return ndev;
1da177e4
LT		 1934 }
1935 }
5c578aed 1936
480318a0 1937 rcu_read_unlock();
4ef1a7cb
XL		 1938 return NULL;
1939}
1940
1941int ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr,
1942 const struct net_device *dev, bool skip_dev_check,
1943 int strict, u32 banned_flags)
1944{
1945 return __ipv6_chk_addr_and_flags(net, addr, dev, skip_dev_check,
1946 strict, banned_flags) ? 1 : 0;
1da177e4 1947}
c58da4c6 1948EXPORT_SYMBOL(ipv6_chk_addr_and_flags);
7159039a 1949
1da177e4 1950
7df37ff3
CB		 1951/* Compares an address/prefix_len with addresses on device @dev.
1952 * If one is found it returns true.
1953 */
1954bool ipv6_chk_custom_prefix(const struct in6_addr *addr,
1955 const unsigned int prefix_len, struct net_device *dev)
1956{
47e26941
ED		 1957 const struct inet6_ifaddr *ifa;
1958 const struct inet6_dev *idev;
7df37ff3
CB		 1959 bool ret = false;
1960
1961 rcu_read_lock();
1962 idev = __in6_dev_get(dev);
1963 if (idev) {
47e26941 1964 list_for_each_entry_rcu(ifa, &idev->addr_list, if_list) {
7df37ff3
CB		 1965 ret = ipv6_prefix_equal(addr, &ifa->addr, prefix_len);
1966 if (ret)
1967 break;
1968 }
7df37ff3
CB		 1969 }
1970 rcu_read_unlock();
1971
1972 return ret;
1973}
1974EXPORT_SYMBOL(ipv6_chk_custom_prefix);
1975
b71d1d42 1976int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev)
52eeeb84 1977{
24ba333b
ED		 1978 const struct inet6_ifaddr *ifa;
1979 const struct inet6_dev *idev;
52eeeb84
YH		 1980 int onlink;
1981
1982 onlink = 0;
1983 rcu_read_lock();
1984 idev = __in6_dev_get(dev);
1985 if (idev) {
24ba333b 1986 list_for_each_entry_rcu(ifa, &idev->addr_list, if_list) {
52eeeb84
YH		 1987 onlink = ipv6_prefix_equal(addr, &ifa->addr,
1988 ifa->prefix_len);
1989 if (onlink)
1990 break;
1991 }
52eeeb84
YH		 1992 }
1993 rcu_read_unlock();
1994 return onlink;
1995}
52eeeb84
YH		 1996EXPORT_SYMBOL(ipv6_chk_prefix);
1997
81f6cb31
XL		 1998/**
1999 * ipv6_dev_find - find the first device with a given source address.
2000 * @net: the net namespace
2001 * @addr: the source address
2c4de211 2002 * @dev: used to find the L3 domain of interest
81f6cb31
XL		 2003 *
2004 * The caller should be protected by RCU, or RTNL.
2005 */
4ef1a7cb
XL		 2006struct net_device *ipv6_dev_find(struct net *net, const struct in6_addr *addr,
2007 struct net_device *dev)
81f6cb31 2008{
4ef1a7cb
XL		 2009 return __ipv6_chk_addr_and_flags(net, addr, dev, !dev, 1,
2010 IFA_F_TENTATIVE);
81f6cb31
XL		 2011}
2012EXPORT_SYMBOL(ipv6_dev_find);
2013
9acd9f3a 2014struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1cab3da6 2015 struct net_device *dev, int strict)
1da177e4 2016{
3f27fb23 2017 unsigned int hash = inet6_addr_hash(net, addr);
b79d1d54 2018 struct inet6_ifaddr *ifp, *result = NULL;
1da177e4 2019
24f226da
ED		 2020 rcu_read_lock();
2021 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
878628fb 2022 if (!net_eq(dev_net(ifp->idev->dev), net))
1cab3da6 2023 continue;
1da177e4 2024 if (ipv6_addr_equal(&ifp->addr, addr)) {
63159f29 2025 if (!dev || ifp->idev->dev == dev ||
1da177e4 2026 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
b79d1d54 2027 result = ifp;
1da177e4
LT		 2028 in6_ifa_hold(ifp);
2029 break;
2030 }
2031 }
2032 }
24f226da 2033 rcu_read_unlock();
1da177e4 2034
b79d1d54 2035 return result;
1da177e4
LT		 2036}
2037
1da177e4
LT		 2038/* Gets referenced address, destroys ifaddr */
2039
cc411d0b 2040static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
1da177e4 2041{
3d171f39
LR		 2042 if (dad_failed)
2043 ifp->flags |= IFA_F_DADFAILED;
2044
ec8add2a 2045 if (ifp->flags&IFA_F_TEMPORARY) {
1da177e4
LT		 2046 struct inet6_ifaddr *ifpub;
2047 spin_lock_bh(&ifp->lock);
2048 ifpub = ifp->ifpub;
2049 if (ifpub) {
2050 in6_ifa_hold(ifpub);
2051 spin_unlock_bh(&ifp->lock);
969c5464 2052 ipv6_create_tempaddr(ifpub, true);
1da177e4
LT		 2053 in6_ifa_put(ifpub);
2054 } else {
2055 spin_unlock_bh(&ifp->lock);
2056 }
2057 ipv6_del_addr(ifp);
ec8add2a
SD		 2058 } else if (ifp->flags&IFA_F_PERMANENT || !dad_failed) {
2059 spin_lock_bh(&ifp->lock);
2060 addrconf_del_dad_work(ifp);
2061 ifp->flags |= IFA_F_TENTATIVE;
f1c02cfb
SD		 2062 if (dad_failed)
2063 ifp->flags &= ~IFA_F_OPTIMISTIC;
ec8add2a
SD		 2064 spin_unlock_bh(&ifp->lock);
2065 if (dad_failed)
2066 ipv6_ifa_notify(0, ifp);
2067 in6_ifa_put(ifp);
c15b1cca 2068 } else {
1da177e4 2069 ipv6_del_addr(ifp);
c15b1cca 2070 }
1da177e4
LT		 2071}
2072
f2344a13
HX		 2073static int addrconf_dad_end(struct inet6_ifaddr *ifp)
2074{
2075 int err = -ENOENT;
2076
8e8e676d 2077 spin_lock_bh(&ifp->lock);
f2344a13
HX		 2078 if (ifp->state == INET6_IFADDR_STATE_DAD) {
2079 ifp->state = INET6_IFADDR_STATE_POSTDAD;
2080 err = 0;
2081 }
8e8e676d 2082 spin_unlock_bh(&ifp->lock);
f2344a13
HX		 2083
2084 return err;
2085}
2086
da13c59b 2087void addrconf_dad_failure(struct sk_buff *skb, struct inet6_ifaddr *ifp)
3c21edbd 2088{
1b34be74 2089 struct inet6_dev *idev = ifp->idev;
1855b7c3 2090 struct net *net = dev_net(ifp->idev->dev);
9bdd8d40 2091
853dc2e0
UB		 2092 if (addrconf_dad_end(ifp)) {
2093 in6_ifa_put(ifp);
f2344a13 2094 return;
853dc2e0 2095 }
f2344a13 2096
da13c59b
VP		 2097 net_info_ratelimited("%s: IPv6 duplicate address %pI6c used by %pM detected!\n",
2098 ifp->idev->dev->name, &ifp->addr, eth_hdr(skb)->h_source);
9bdd8d40 2099
5f40ef77
HFS		 2100 spin_lock_bh(&ifp->lock);
2101
2102 if (ifp->flags & IFA_F_STABLE_PRIVACY) {
5f40ef77
HFS		 2103 struct in6_addr new_addr;
2104 struct inet6_ifaddr *ifp2;
5f40ef77 2105 int retries = ifp->stable_privacy_retry + 1;
e6464b8c
DA		 2106 struct ifa6_config cfg = {
2107 .pfx = &new_addr,
2108 .plen = ifp->prefix_len,
2109 .ifa_flags = ifp->flags,
2110 .valid_lft = ifp->valid_lft,
2111 .preferred_lft = ifp->prefered_lft,
2112 .scope = ifp->scope,
2113 };
5f40ef77 2114
1855b7c3 2115 if (retries > net->ipv6.sysctl.idgen_retries) {
5f40ef77
HFS		 2116 net_info_ratelimited("%s: privacy stable address generation failed because of DAD conflicts!\n",
2117 ifp->idev->dev->name);
2118 goto errdad;
2119 }
2120
2121 new_addr = ifp->addr;
2122 if (ipv6_generate_stable_address(&new_addr, retries,
2123 idev))
2124 goto errdad;
2125
5f40ef77 2126 spin_unlock_bh(&ifp->lock);
1b34be74 2127
5f40ef77
HFS		 2128 if (idev->cnf.max_addresses &&
2129 ipv6_count_addresses(idev) >=
2130 idev->cnf.max_addresses)
2131 goto lock_errdad;
2132
2133 net_info_ratelimited("%s: generating new stable privacy address because of DAD conflict\n",
2134 ifp->idev->dev->name);
2135
e6464b8c 2136 ifp2 = ipv6_add_addr(idev, &cfg, false, NULL);
5f40ef77
HFS		 2137 if (IS_ERR(ifp2))
2138 goto lock_errdad;
2139
2140 spin_lock_bh(&ifp2->lock);
2141 ifp2->stable_privacy_retry = retries;
2142 ifp2->state = INET6_IFADDR_STATE_PREDAD;
2143 spin_unlock_bh(&ifp2->lock);
2144
1855b7c3 2145 addrconf_mod_dad_work(ifp2, net->ipv6.sysctl.idgen_delay);
5f40ef77
HFS		 2146 in6_ifa_put(ifp2);
2147lock_errdad:
2148 spin_lock_bh(&ifp->lock);
1b34be74
YH		 2149 }
2150
5f40ef77 2151errdad:
c15b1cca
HFS		 2152 /* transition from _POSTDAD to _ERRDAD */
2153 ifp->state = INET6_IFADDR_STATE_ERRDAD;
8e8e676d 2154 spin_unlock_bh(&ifp->lock);
c15b1cca
HFS		 2155
2156 addrconf_mod_dad_work(ifp, 0);
751eb6b6 2157 in6_ifa_put(ifp);
3c21edbd 2158}
1da177e4 2159
a9ed4a29
SD		 2160/* Join to solicited addr multicast group.
2161 * caller must hold RTNL */
b71d1d42 2162void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr)
1da177e4
LT		 2163{
2164 struct in6_addr maddr;
2165
2166 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
2167 return;
2168
2169 addrconf_addr_solict_mult(addr, &maddr);
2170 ipv6_dev_mc_inc(dev, &maddr);
2171}
2172
a9ed4a29 2173/* caller must hold RTNL */
b71d1d42 2174void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr)
1da177e4
LT		 2175{
2176 struct in6_addr maddr;
2177
2178 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
2179 return;
2180
2181 addrconf_addr_solict_mult(addr, &maddr);
2182 __ipv6_dev_mc_dec(idev, &maddr);
2183}
2184
a9ed4a29 2185/* caller must hold RTNL */
20380731 2186static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1da177e4
LT		 2187{
2188 struct in6_addr addr;
c15b1cca 2189
88ad3149 2190 if (ifp->prefix_len >= 127) /* RFC 6164 */
2bda8a0c 2191 return;
1da177e4
LT		 2192 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
2193 if (ipv6_addr_any(&addr))
2194 return;
013b4d90 2195 __ipv6_dev_ac_inc(ifp->idev, &addr);
1da177e4
LT		 2196}
2197
a9ed4a29 2198/* caller must hold RTNL */
20380731 2199static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1da177e4
LT		 2200{
2201 struct in6_addr addr;
c15b1cca 2202
88ad3149 2203 if (ifp->prefix_len >= 127) /* RFC 6164 */
32019e65 2204 return;
1da177e4
LT		 2205 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
2206 if (ipv6_addr_any(&addr))
2207 return;
2208 __ipv6_dev_ac_dec(ifp->idev, &addr);
2209}
2210
8a7a4b47 2211static int addrconf_ifid_6lowpan(u8 *eui, struct net_device *dev)
06a4c1c5 2212{
8a7a4b47
AA		 2213 switch (dev->addr_len) {
2214 case ETH_ALEN:
9dae2e03
LAD		 2215 memcpy(eui, dev->dev_addr, 3);
2216 eui[3] = 0xFF;
2217 eui[4] = 0xFE;
2218 memcpy(eui + 5, dev->dev_addr + 3, 3);
2219 break;
8a7a4b47
AA		 2220 case EUI64_ADDR_LEN:
2221 memcpy(eui, dev->dev_addr, EUI64_ADDR_LEN);
2222 eui[0] ^= 2;
2223 break;
2224 default:
06a4c1c5 2225 return -1;
8a7a4b47
AA		 2226 }
2227
06a4c1c5 2228 return 0;
2229}
2230
cb6bf355
YH		 2231static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev)
2232{
2233 union fwnet_hwaddr *ha;
2234
2235 if (dev->addr_len != FWNET_ALEN)
2236 return -1;
2237
2238 ha = (union fwnet_hwaddr *)dev->dev_addr;
2239
2240 memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id));
2241 eui[0] ^= 2;
2242 return 0;
2243}
2244
073a8e0e
YH		 2245static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
2246{
2247 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
2248 if (dev->addr_len != ARCNET_ALEN)
2249 return -1;
2250 memset(eui, 0, 7);
8e5e8f30 2251 eui[7] = *(u8 *)dev->dev_addr;
073a8e0e
YH		 2252 return 0;
2253}
2254
2255static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
2256{
2257 if (dev->addr_len != INFINIBAND_ALEN)
2258 return -1;
2259 memcpy(eui, dev->dev_addr + 12, 8);
2260 eui[0] |= 2;
2261 return 0;
2262}
2263
c61393ea 2264static int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
dfd982ba 2265{
9af28511
SH		 2266 if (addr == 0)
2267 return -1;
dfd982ba
YH		 2268 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
2269 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
2270 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
2271 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
2272 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
2273 ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
2274 eui[1] = 0;
2275 eui[2] = 0x5E;
2276 eui[3] = 0xFE;
2277 memcpy(eui + 4, &addr, 4);
2278 return 0;
2279}
dfd982ba
YH		 2280
2281static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
2282{
2283 if (dev->priv_flags & IFF_ISATAP)
2284 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
2285 return -1;
2286}
2287
aee80b54 2288static int addrconf_ifid_gre(u8 *eui, struct net_device *dev)
2289{
2290 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
2291}
2292
e837735e
ND		 2293static int addrconf_ifid_ip6tnl(u8 *eui, struct net_device *dev)
2294{
2295 memcpy(eui, dev->perm_addr, 3);
2296 memcpy(eui + 5, dev->perm_addr + 3, 3);
2297 eui[3] = 0xFF;
2298 eui[4] = 0xFE;
2299 eui[0] ^= 2;
2300 return 0;
2301}
2302
1da177e4
LT		 2303static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
2304{
2305 switch (dev->type) {
2306 case ARPHRD_ETHER:
2307 case ARPHRD_FDDI:
073a8e0e 2308 return addrconf_ifid_eui48(eui, dev);
1da177e4 2309 case ARPHRD_ARCNET:
073a8e0e 2310 return addrconf_ifid_arcnet(eui, dev);
1da177e4 2311 case ARPHRD_INFINIBAND:
073a8e0e 2312 return addrconf_ifid_infiniband(eui, dev);
c7dc89c0 2313 case ARPHRD_SIT:
dfd982ba 2314 return addrconf_ifid_sit(eui, dev);
aee80b54 2315 case ARPHRD_IPGRE:
45ce0fd1 2316 case ARPHRD_TUNNEL:
aee80b54 2317 return addrconf_ifid_gre(eui, dev);
e74bccb8 2318 case ARPHRD_6LOWPAN:
8a7a4b47 2319 return addrconf_ifid_6lowpan(eui, dev);
cb6bf355
YH		 2320 case ARPHRD_IEEE1394:
2321 return addrconf_ifid_ieee1394(eui, dev);
e837735e 2322 case ARPHRD_TUNNEL6:
45ce0fd1 2323 case ARPHRD_IP6GRE:
9deb441c 2324 case ARPHRD_RAWIP:
e837735e 2325 return addrconf_ifid_ip6tnl(eui, dev);
1da177e4
LT		 2326 }
2327 return -1;
2328}
2329
2330static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
2331{
2332 int err = -1;
2333 struct inet6_ifaddr *ifp;
2334
2335 read_lock_bh(&idev->lock);
602582ca
HFS		 2336 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
2337 if (ifp->scope > IFA_LINK)
2338 break;
1da177e4
LT		 2339 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
2340 memcpy(eui, ifp->addr.s6_addr+8, 8);
2341 err = 0;
2342 break;
2343 }
2344 }
2345 read_unlock_bh(&idev->lock);
2346 return err;
2347}
2348
969c5464
FG		 2349/* Generation of a randomized Interface Identifier
2350 * draft-ietf-6man-rfc4941bis, Section 3.3.1
2351 */
2352
2353static void ipv6_gen_rnd_iid(struct in6_addr *addr)
1da177e4 2354{
1da177e4 2355regen:
969c5464 2356 get_random_bytes(&addr->s6_addr[8], 8);
1da177e4 2357
969c5464
FG		 2358 /* <draft-ietf-6man-rfc4941bis-08.txt>, Section 3.3.1:
2359 * check if generated address is not inappropriate:
1da177e4 2360 *
912b519a 2361 * - Reserved IPv6 Interface Identifiers
969c5464 2362 * - XXX: already assigned to an address on the device
1da177e4 2363 */
969c5464
FG		 2364
2365 /* Subnet-router anycast: 0000:0000:0000:0000 */
2366 if (!(addr->s6_addr32[2] | addr->s6_addr32[3]))
1da177e4 2367 goto regen;
1da177e4 2368
969c5464
FG		 2369 /* IANA Ethernet block: 0200:5EFF:FE00:0000-0200:5EFF:FE00:5212
2370 * Proxy Mobile IPv6: 0200:5EFF:FE00:5213
2371 * IANA Ethernet block: 0200:5EFF:FE00:5214-0200:5EFF:FEFF:FFFF
2372 */
2373 if (ntohl(addr->s6_addr32[2]) == 0x02005eff &&
2374 (ntohl(addr->s6_addr32[3]) & 0Xff000000) == 0xfe000000)
2375 goto regen;
2376
2377 /* Reserved subnet anycast addresses */
2378 if (ntohl(addr->s6_addr32[2]) == 0xfdffffff &&
2379 ntohl(addr->s6_addr32[3]) >= 0Xffffff80)
2380 goto regen;
1da177e4 2381}
1da177e4
LT		 2382
2383/*
2384 * Add prefix route.
2385 */
2386
2387static void
8308f3ff
DA		 2388addrconf_prefix_route(struct in6_addr *pfx, int plen, u32 metric,
2389 struct net_device *dev, unsigned long expires,
2390 u32 flags, gfp_t gfp_flags)
1da177e4 2391{
86872cb5 2392 struct fib6_config cfg = {
ca254490 2393 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX,
8308f3ff 2394 .fc_metric = metric ? : IP6_RT_PRIO_ADDRCONF,
86872cb5
TG		 2395 .fc_ifindex = dev->ifindex,
2396 .fc_expires = expires,
2397 .fc_dst_len = plen,
2398 .fc_flags = RTF_UP | flags,
c346dca1 2399 .fc_nlinfo.nl_net = dev_net(dev),
f410a1fb 2400 .fc_protocol = RTPROT_KERNEL,
e8478e80 2401 .fc_type = RTN_UNICAST,
86872cb5 2402 };
1da177e4 2403
4e3fd7a0 2404 cfg.fc_dst = *pfx;
1da177e4
LT		 2405
2406 /* Prevent useless cloning on PtP SIT.
2407 This thing is done here expecting that the whole
2408 class of non-broadcast devices need not cloning.
2409 */
07a93626 2410#if IS_ENABLED(CONFIG_IPV6_SIT)
86872cb5
TG		 2411 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
2412 cfg.fc_flags |= RTF_NONEXTHOP;
0be669bb 2413#endif
1da177e4 2414
acb54e3c 2415 ip6_route_add(&cfg, gfp_flags, NULL);
1da177e4
LT		 2416}
2417
14ef37b6 2418
8d1c802b 2419static struct fib6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
14ef37b6
AH		 2420 int plen,
2421 const struct net_device *dev,
2b2450ca
DA		 2422 u32 flags, u32 noflags,
2423 bool no_gw)
14ef37b6
AH		 2424{
2425 struct fib6_node *fn;
8d1c802b 2426 struct fib6_info *rt = NULL;
14ef37b6 2427 struct fib6_table *table;
ca254490 2428 u32 tb_id = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX;
14ef37b6 2429
ca254490 2430 table = fib6_get_table(dev_net(dev), tb_id);
63159f29 2431 if (!table)
14ef37b6
AH		 2432 return NULL;
2433
66f5d6ce 2434 rcu_read_lock();
38fbeeee 2435 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0, true);
14ef37b6
AH		 2436 if (!fn)
2437 goto out;
1f56a01f 2438
66f5d6ce 2439 for_each_fib6_node_rt_rcu(fn) {
f88d8ea6
DA		 2440 /* prefix routes only use builtin fib6_nh */
2441 if (rt->nh)
2442 continue;
2443
1cf844c7 2444 if (rt->fib6_nh->fib_nh_dev->ifindex != dev->ifindex)
14ef37b6 2445 continue;
1cf844c7 2446 if (no_gw && rt->fib6_nh->fib_nh_gw_family)
2b2450ca 2447 continue;
93c2fb25 2448 if ((rt->fib6_flags & flags) != flags)
14ef37b6 2449 continue;
93c2fb25 2450 if ((rt->fib6_flags & noflags) != 0)
14ef37b6 2451 continue;
e873e4b9
WW		 2452 if (!fib6_info_hold_safe(rt))
2453 continue;
14ef37b6
AH		 2454 break;
2455 }
2456out:
66f5d6ce 2457 rcu_read_unlock();
14ef37b6
AH		 2458 return rt;
2459}
2460
2461
1da177e4
LT		 2462/* Create "default" multicast route to the interface */
2463
2464static void addrconf_add_mroute(struct net_device *dev)
2465{
86872cb5 2466 struct fib6_config cfg = {
ca254490 2467 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_LOCAL,
86872cb5
TG		 2468 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2469 .fc_ifindex = dev->ifindex,
2470 .fc_dst_len = 8,
2471 .fc_flags = RTF_UP,
ceed9038 2472 .fc_type = RTN_MULTICAST,
c346dca1 2473 .fc_nlinfo.nl_net = dev_net(dev),
a826b043 2474 .fc_protocol = RTPROT_KERNEL,
86872cb5
TG		 2475 };
2476
2477 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
2478
e500c6d3 2479 ip6_route_add(&cfg, GFP_KERNEL, NULL);
1da177e4
LT		 2480}
2481
1da177e4
LT		 2482static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
2483{
2484 struct inet6_dev *idev;
2485
2486 ASSERT_RTNL();
2487
e21e8467 2488 idev = ipv6_find_idev(dev);
db0b99f5
SD		 2489 if (IS_ERR(idev))
2490 return idev;
64e724f6
BH		 2491
2492 if (idev->cnf.disable_ipv6)
2493 return ERR_PTR(-EACCES);
1da177e4
LT		 2494
2495 /* Add default multicast route */
ba46ee4c 2496 if (!(dev->flags & IFF_LOOPBACK) && !netif_is_l3_master(dev))
4af04aba 2497 addrconf_add_mroute(dev);
1da177e4 2498
1da177e4
LT		 2499 return idev;
2500}
2501
53bd6749
JP		 2502static void manage_tempaddrs(struct inet6_dev *idev,
2503 struct inet6_ifaddr *ifp,
2504 __u32 valid_lft, __u32 prefered_lft,
2505 bool create, unsigned long now)
2506{
2507 u32 flags;
2508 struct inet6_ifaddr *ift;
2509
2510 read_lock_bh(&idev->lock);
2511 /* update all temporary addresses in the list */
2512 list_for_each_entry(ift, &idev->tempaddr_list, tmp_list) {
2513 int age, max_valid, max_prefered;
2514
2515 if (ifp != ift->ifpub)
2516 continue;
2517
2518 /* RFC 4941 section 3.3:
2519 * If a received option will extend the lifetime of a public
2520 * address, the lifetimes of temporary addresses should
2521 * be extended, subject to the overall constraint that no
2522 * temporary addresses should ever remain "valid" or "preferred"
2523 * for a time longer than (TEMP_VALID_LIFETIME) or
2524 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), respectively.
2525 */
2526 age = (now - ift->cstamp) / HZ;
2527 max_valid = idev->cnf.temp_valid_lft - age;
2528 if (max_valid < 0)
2529 max_valid = 0;
2530
2531 max_prefered = idev->cnf.temp_prefered_lft -
76506a98 2532 idev->desync_factor - age;
53bd6749
JP		 2533 if (max_prefered < 0)
2534 max_prefered = 0;
2535
2536 if (valid_lft > max_valid)
2537 valid_lft = max_valid;
2538
2539 if (prefered_lft > max_prefered)
2540 prefered_lft = max_prefered;
2541
2542 spin_lock(&ift->lock);
2543 flags = ift->flags;
2544 ift->valid_lft = valid_lft;
2545 ift->prefered_lft = prefered_lft;
2546 ift->tstamp = now;
2547 if (prefered_lft > 0)
2548 ift->flags &= ~IFA_F_DEPRECATED;
2549
2550 spin_unlock(&ift->lock);
2551 if (!(flags&IFA_F_TENTATIVE))
2552 ipv6_ifa_notify(0, ift);
2553 }
2554
2555 if ((create || list_empty(&idev->tempaddr_list)) &&
2556 idev->cnf.use_tempaddr > 0) {
2557 /* When a new public address is created as described
2558 * in [ADDRCONF], also create a new temporary address.
2559 * Also create a temporary address if it's enabled but
2560 * no temporary address currently exists.
2561 */
2562 read_unlock_bh(&idev->lock);
969c5464 2563 ipv6_create_tempaddr(ifp, false);
53bd6749
JP		 2564 } else {
2565 read_unlock_bh(&idev->lock);
2566 }
2567}
2568
cc9da6cc
BM		 2569static bool is_addr_mode_generate_stable(struct inet6_dev *idev)
2570{
d35a00b8
FJ		 2571 return idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY ||
2572 idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_RANDOM;
cc9da6cc
BM		 2573}
2574
cc84b3c6
AA		 2575int addrconf_prefix_rcv_add_addr(struct net *net, struct net_device *dev,
2576 const struct prefix_info *pinfo,
2577 struct inet6_dev *in6_dev,
2578 const struct in6_addr *addr, int addr_type,
2579 u32 addr_flags, bool sllao, bool tokenized,
2580 __u32 valid_lft, u32 prefered_lft)
4f672235
AA		 2581{
2582 struct inet6_ifaddr *ifp = ipv6_get_ifaddr(net, addr, dev, 1);
b75326c2 2583 int create = 0;
4f672235
AA		 2584
2585 if (!ifp && valid_lft) {
2586 int max_addresses = in6_dev->cnf.max_addresses;
e6464b8c
DA		 2587 struct ifa6_config cfg = {
2588 .pfx = addr,
2589 .plen = pinfo->prefix_len,
2590 .ifa_flags = addr_flags,
2591 .valid_lft = valid_lft,
2592 .preferred_lft = prefered_lft,
2593 .scope = addr_type & IPV6_ADDR_SCOPE_MASK,
2594 };
4f672235
AA		 2595
2596#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
35e015e1
MC		 2597 if ((net->ipv6.devconf_all->optimistic_dad ||
2598 in6_dev->cnf.optimistic_dad) &&
4f672235 2599 !net->ipv6.devconf_all->forwarding && sllao)
e6464b8c 2600 cfg.ifa_flags |= IFA_F_OPTIMISTIC;
4f672235
AA		 2601#endif
2602
2603 /* Do not allow to create too much of autoconfigured
2604 * addresses; this would be too easy way to crash kernel.
2605 */
2606 if (!max_addresses ||
2607 ipv6_count_addresses(in6_dev) < max_addresses)
e6464b8c 2608 ifp = ipv6_add_addr(in6_dev, &cfg, false, NULL);
4f672235
AA		 2609
2610 if (IS_ERR_OR_NULL(ifp))
2611 return -1;
2612
4f672235
AA		 2613 create = 1;
2614 spin_lock_bh(&ifp->lock);
2615 ifp->flags |= IFA_F_MANAGETEMPADDR;
2616 ifp->cstamp = jiffies;
2617 ifp->tokenized = tokenized;
2618 spin_unlock_bh(&ifp->lock);
2619 addrconf_dad_start(ifp);
2620 }
2621
2622 if (ifp) {
2623 u32 flags;
2624 unsigned long now;
2625 u32 stored_lft;
2626
b75326c2
FG		 2627 /* Update lifetime (RFC4862 5.5.3 e)
2628 * We deviate from RFC4862 by honoring all Valid Lifetimes to
2629 * improve the reaction of SLAAC to renumbering events
2630 * (draft-gont-6man-slaac-renum-06, Section 4.2)
2631 */
4f672235
AA		 2632 spin_lock_bh(&ifp->lock);
2633 now = jiffies;
2634 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
2635 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
2636 else
2637 stored_lft = 0;
4f672235 2638
b75326c2 2639 if (!create && stored_lft) {
4f672235
AA		 2640 ifp->valid_lft = valid_lft;
2641 ifp->prefered_lft = prefered_lft;
2642 ifp->tstamp = now;
2643 flags = ifp->flags;
2644 ifp->flags &= ~IFA_F_DEPRECATED;
2645 spin_unlock_bh(&ifp->lock);
2646
2647 if (!(flags&IFA_F_TENTATIVE))
2648 ipv6_ifa_notify(0, ifp);
2649 } else
2650 spin_unlock_bh(&ifp->lock);
2651
2652 manage_tempaddrs(in6_dev, ifp, valid_lft, prefered_lft,
2653 create, now);
2654
2655 in6_ifa_put(ifp);
2656 addrconf_verify();
2657 }
2658
2659 return 0;
2660}
cc84b3c6 2661EXPORT_SYMBOL_GPL(addrconf_prefix_rcv_add_addr);
4f672235 2662
e6bff995 2663void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao)
1da177e4
LT		 2664{
2665 struct prefix_info *pinfo;
2666 __u32 valid_lft;
2667 __u32 prefered_lft;
4f672235 2668 int addr_type, err;
64236f3f 2669 u32 addr_flags = 0;
1da177e4 2670 struct inet6_dev *in6_dev;
56d417b1 2671 struct net *net = dev_net(dev);
1da177e4
LT		 2672
2673 pinfo = (struct prefix_info *) opt;
1ab1457c 2674
1da177e4 2675 if (len < sizeof(struct prefix_info)) {
e32ac250 2676 netdev_dbg(dev, "addrconf: prefix option too short\n");
1da177e4
LT		 2677 return;
2678 }
1ab1457c 2679
1da177e4
LT		 2680 /*
2681 * Validation checks ([ADDRCONF], page 19)
2682 */
2683
2684 addr_type = ipv6_addr_type(&pinfo->prefix);
2685
2686 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
2687 return;
2688
2689 valid_lft = ntohl(pinfo->valid);
2690 prefered_lft = ntohl(pinfo->prefered);
2691
2692 if (prefered_lft > valid_lft) {
e87cc472 2693 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n");
1da177e4
LT		 2694 return;
2695 }
2696
2697 in6_dev = in6_dev_get(dev);
2698
63159f29 2699 if (!in6_dev) {
e87cc472
JP		 2700 net_dbg_ratelimited("addrconf: device %s not configured\n",
2701 dev->name);
1da177e4
LT		 2702 return;
2703 }
2704
2705 /*
2706 * Two things going on here:
2707 * 1) Add routes for on-link prefixes
2708 * 2) Configure prefixes with the auto flag set
2709 */
2710
4bed72e4 2711 if (pinfo->onlink) {
8d1c802b 2712 struct fib6_info *rt;
4bed72e4
YH		 2713 unsigned long rt_expires;
2714
6f704992
YH		 2715 /* Avoid arithmetic overflow. Really, we could
2716 * save rt_expires in seconds, likely valid_lft,
2717 * but it would require division in fib gc, that it
2718 * not good.
2719 */
4bed72e4
YH		 2720 if (HZ > USER_HZ)
2721 rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
2722 else
2723 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
3dd4bc68 2724
4bed72e4
YH		 2725 if (addrconf_finite_timeout(rt_expires))
2726 rt_expires *= HZ;
1da177e4 2727
14ef37b6
AH		 2728 rt = addrconf_get_prefix_route(&pinfo->prefix,
2729 pinfo->prefix_len,
2730 dev,
2731 RTF_ADDRCONF | RTF_PREFIX_RT,
2b2450ca 2732 RTF_DEFAULT, true);
1da177e4 2733
14ef37b6 2734 if (rt) {
6f704992
YH		 2735 /* Autoconf prefix route */
2736 if (valid_lft == 0) {
11dd74b3 2737 ip6_del_rt(net, rt, false);
6f704992 2738 rt = NULL;
4bed72e4 2739 } else if (addrconf_finite_timeout(rt_expires)) {
6f704992 2740 /* not infinity */
14895687 2741 fib6_set_expires(rt, jiffies + rt_expires);
6f704992 2742 } else {
14895687 2743 fib6_clean_expires(rt);
1da177e4
LT		 2744 }
2745 } else if (valid_lft) {
6f704992 2746 clock_t expires = 0;
4bed72e4
YH		 2747 int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
2748 if (addrconf_finite_timeout(rt_expires)) {
6f704992
YH		 2749 /* not infinity */
2750 flags |= RTF_EXPIRES;
2751 expires = jiffies_to_clock_t(rt_expires);
2752 }
1da177e4 2753 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
8308f3ff
DA		 2754 0, dev, expires, flags,
2755 GFP_ATOMIC);
1da177e4 2756 }
93531c67 2757 fib6_info_release(rt);
1da177e4
LT		 2758 }
2759
2760 /* Try to figure out our local address for this prefix */
2761
2762 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
1da177e4 2763 struct in6_addr addr;
f997c55c 2764 bool tokenized = false, dev_addr_generated = false;
1da177e4
LT		 2765
2766 if (pinfo->prefix_len == 64) {
2767 memcpy(&addr, &pinfo->prefix, 8);
f53adae4
DB		 2768
2769 if (!ipv6_addr_any(&in6_dev->token)) {
2770 read_lock_bh(&in6_dev->lock);
2771 memcpy(addr.s6_addr + 8,
2772 in6_dev->token.s6_addr + 8, 8);
2773 read_unlock_bh(&in6_dev->lock);
617fe29d 2774 tokenized = true;
cc9da6cc 2775 } else if (is_addr_mode_generate_stable(in6_dev) &&
622c81d5
HFS		 2776 !ipv6_generate_stable_address(&addr, 0,
2777 in6_dev)) {
64236f3f 2778 addr_flags |= IFA_F_STABLE_PRIVACY;
622c81d5 2779 goto ok;
f53adae4
DB		 2780 } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
2781 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
4f672235 2782 goto put;
f997c55c
AA		 2783 } else {
2784 dev_addr_generated = true;
1da177e4
LT		 2785 }
2786 goto ok;
2787 }
e87cc472
JP		 2788 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n",
2789 pinfo->prefix_len);
4f672235 2790 goto put;
1da177e4
LT		 2791
2792ok:
4f672235
AA		 2793 err = addrconf_prefix_rcv_add_addr(net, dev, pinfo, in6_dev,
2794 &addr, addr_type,
2795 addr_flags, sllao,
2796 tokenized, valid_lft,
2797 prefered_lft);
2798 if (err)
2799 goto put;
f997c55c
AA		 2800
2801 /* Ignore error case here because previous prefix add addr was
2802 * successful which will be notified.
2803 */
2804 ndisc_ops_prefix_rcv_add_addr(net, dev, pinfo, in6_dev, &addr,
2805 addr_type, addr_flags, sllao,
2806 tokenized, valid_lft,
2807 prefered_lft,
2808 dev_addr_generated);
1da177e4
LT		 2809 }
2810 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
4f672235 2811put:
1da177e4
LT		 2812 in6_dev_put(in6_dev);
2813}
2814
68ad6886
CH		 2815static int addrconf_set_sit_dstaddr(struct net *net, struct net_device *dev,
2816 struct in6_ifreq *ireq)
2817{
2818 struct ip_tunnel_parm p = { };
68ad6886
CH		 2819 int err;
2820
2821 if (!(ipv6_addr_type(&ireq->ifr6_addr) & IPV6_ADDR_COMPATv4))
2822 return -EADDRNOTAVAIL;
2823
2824 p.iph.daddr = ireq->ifr6_addr.s6_addr32[3];
2825 p.iph.version = 4;
2826 p.iph.ihl = 5;
2827 p.iph.protocol = IPPROTO_IPV6;
2828 p.iph.ttl = 64;
68ad6886 2829
8e3db0bb 2830 if (!dev->netdev_ops->ndo_tunnel_ctl)
68ad6886 2831 return -EOPNOTSUPP;
8e3db0bb 2832 err = dev->netdev_ops->ndo_tunnel_ctl(dev, &p, SIOCADDTUNNEL);
68ad6886
CH		 2833 if (err)
2834 return err;
2835
2836 dev = __dev_get_by_name(net, p.name);
2837 if (!dev)
2838 return -ENOBUFS;
2839 return dev_open(dev, NULL);
2840}
2841
1da177e4
LT		 2842/*
2843 * Set destination address.
2844 * Special case for SIT interfaces where we create a new "virtual"
2845 * device.
2846 */
af284937 2847int addrconf_set_dstaddr(struct net *net, void __user *arg)
1da177e4 2848{
1da177e4 2849 struct net_device *dev;
68ad6886
CH		 2850 struct in6_ifreq ireq;
2851 int err = -ENODEV;
1da177e4 2852
f0988460
CH		 2853 if (!IS_ENABLED(CONFIG_IPV6_SIT))
2854 return -ENODEV;
1da177e4 2855 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
68ad6886 2856 return -EFAULT;
1da177e4 2857
68ad6886 2858 rtnl_lock();
af284937 2859 dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
68ad6886
CH		 2860 if (dev && dev->type == ARPHRD_SIT)
2861 err = addrconf_set_sit_dstaddr(net, dev, &ireq);
1da177e4
LT		 2862 rtnl_unlock();
2863 return err;
2864}
2865
93a714d6
MC		 2866static int ipv6_mc_config(struct sock *sk, bool join,
2867 const struct in6_addr *addr, int ifindex)
2868{
2869 int ret;
2870
2871 ASSERT_RTNL();
2872
2873 lock_sock(sk);
2874 if (join)
54ff9ef3 2875 ret = ipv6_sock_mc_join(sk, ifindex, addr);
93a714d6 2876 else
54ff9ef3 2877 ret = ipv6_sock_mc_drop(sk, ifindex, addr);
93a714d6
MC		 2878 release_sock(sk);
2879
2880 return ret;
2881}
2882
1da177e4
LT		 2883/*
2884 * Manual configuration of address on an interface
2885 */
479840ff 2886static int inet6_addr_add(struct net *net, int ifindex,
19b1518c 2887 struct ifa6_config *cfg,
de95e047 2888 struct netlink_ext_ack *extack)
1da177e4
LT		 2889{
2890 struct inet6_ifaddr *ifp;
2891 struct inet6_dev *idev;
2892 struct net_device *dev;
93a714d6
MC		 2893 unsigned long timeout;
2894 clock_t expires;
6f704992 2895 u32 flags;
1da177e4
LT		 2896
2897 ASSERT_RTNL();
1ab1457c 2898
19b1518c 2899 if (cfg->plen > 128)
24ef0da7
TG		 2900 return -EINVAL;
2901
0778769d 2902 /* check the lifetime */
19b1518c 2903 if (!cfg->valid_lft || cfg->preferred_lft > cfg->valid_lft)
0778769d
NT		 2904 return -EINVAL;
2905
19b1518c 2906 if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR && cfg->plen != 64)
53bd6749
JP		 2907 return -EINVAL;
2908
af284937
DL		 2909 dev = __dev_get_by_index(net, ifindex);
2910 if (!dev)
1da177e4 2911 return -ENODEV;
1ab1457c 2912
64e724f6
BH		 2913 idev = addrconf_add_dev(dev);
2914 if (IS_ERR(idev))
2915 return PTR_ERR(idev);
1da177e4 2916
19b1518c 2917 if (cfg->ifa_flags & IFA_F_MCAUTOJOIN) {
93a714d6 2918 int ret = ipv6_mc_config(net->ipv6.mc_autojoin_sk,
19b1518c 2919 true, cfg->pfx, ifindex);
93a714d6
MC		 2920
2921 if (ret < 0)
2922 return ret;
2923 }
2924
19b1518c 2925 cfg->scope = ipv6_addr_scope(cfg->pfx);
1da177e4 2926
19b1518c 2927 timeout = addrconf_timeout_fixup(cfg->valid_lft, HZ);
4bed72e4
YH		 2928 if (addrconf_finite_timeout(timeout)) {
2929 expires = jiffies_to_clock_t(timeout * HZ);
19b1518c 2930 cfg->valid_lft = timeout;
6f704992 2931 flags = RTF_EXPIRES;
4bed72e4
YH		 2932 } else {
2933 expires = 0;
2934 flags = 0;
19b1518c 2935 cfg->ifa_flags |= IFA_F_PERMANENT;
6f704992 2936 }
0778769d 2937
19b1518c 2938 timeout = addrconf_timeout_fixup(cfg->preferred_lft, HZ);
4bed72e4
YH		 2939 if (addrconf_finite_timeout(timeout)) {
2940 if (timeout == 0)
19b1518c
DA		 2941 cfg->ifa_flags |= IFA_F_DEPRECATED;
2942 cfg->preferred_lft = timeout;
4bed72e4 2943 }
0778769d 2944
19b1518c 2945 ifp = ipv6_add_addr(idev, cfg, true, extack);
1da177e4 2946 if (!IS_ERR(ifp)) {
19b1518c 2947 if (!(cfg->ifa_flags & IFA_F_NOPREFIXROUTE)) {
8308f3ff
DA		 2948 addrconf_prefix_route(&ifp->addr, ifp->prefix_len,
2949 ifp->rt_priority, dev, expires,
2950 flags, GFP_KERNEL);
761aac73
TH		 2951 }
2952
a2d481b3
LB		 2953 /* Send a netlink notification if DAD is enabled and
2954 * optimistic flag is not set
2955 */
2956 if (!(ifp->flags & (IFA_F_OPTIMISTIC | IFA_F_NODAD)))
2957 ipv6_ifa_notify(0, ifp);
95c385b4
NH		 2958 /*
2959 * Note that section 3.1 of RFC 4429 indicates
2960 * that the Optimistic flag should not be set for
2961 * manually configured addresses
2962 */
cf22f9a2 2963 addrconf_dad_start(ifp);
19b1518c
DA		 2964 if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR)
2965 manage_tempaddrs(idev, ifp, cfg->valid_lft,
2966 cfg->preferred_lft, true, jiffies);
1da177e4 2967 in6_ifa_put(ifp);
c15b1cca 2968 addrconf_verify_rtnl();
1da177e4 2969 return 0;
19b1518c
DA		 2970 } else if (cfg->ifa_flags & IFA_F_MCAUTOJOIN) {
2971 ipv6_mc_config(net->ipv6.mc_autojoin_sk, false,
2972 cfg->pfx, ifindex);
1da177e4
LT		 2973 }
2974
2975 return PTR_ERR(ifp);
2976}
2977
6046d5b4
HK		 2978static int inet6_addr_del(struct net *net, int ifindex, u32 ifa_flags,
2979 const struct in6_addr *pfx, unsigned int plen)
1da177e4
LT		 2980{
2981 struct inet6_ifaddr *ifp;
2982 struct inet6_dev *idev;
2983 struct net_device *dev;
1ab1457c 2984
24ef0da7
TG		 2985 if (plen > 128)
2986 return -EINVAL;
2987
af284937
DL		 2988 dev = __dev_get_by_index(net, ifindex);
2989 if (!dev)
1da177e4
LT		 2990 return -ENODEV;
2991
e5d08d71 2992 idev = __in6_dev_get(dev);
63159f29 2993 if (!idev)
1da177e4
LT		 2994 return -ENXIO;
2995
2996 read_lock_bh(&idev->lock);
502a2ffd 2997 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1da177e4
LT		 2998 if (ifp->prefix_len == plen &&
2999 ipv6_addr_equal(pfx, &ifp->addr)) {
3000 in6_ifa_hold(ifp);
3001 read_unlock_bh(&idev->lock);
1ab1457c 3002
6046d5b4
HK		 3003 if (!(ifp->flags & IFA_F_TEMPORARY) &&
3004 (ifa_flags & IFA_F_MANAGETEMPADDR))
3005 manage_tempaddrs(idev, ifp, 0, 0, false,
3006 jiffies);
1da177e4 3007 ipv6_del_addr(ifp);
6046d5b4 3008 addrconf_verify_rtnl();
93a714d6
MC		 3009 if (ipv6_addr_is_multicast(pfx)) {
3010 ipv6_mc_config(net->ipv6.mc_autojoin_sk,
3011 false, pfx, dev->ifindex);
3012 }
1da177e4
LT		 3013 return 0;
3014 }
3015 }
3016 read_unlock_bh(&idev->lock);
3017 return -EADDRNOTAVAIL;
3018}
3019
3020
af284937 3021int addrconf_add_ifaddr(struct net *net, void __user *arg)
1da177e4 3022{
19b1518c
DA		 3023 struct ifa6_config cfg = {
3024 .ifa_flags = IFA_F_PERMANENT,
3025 .preferred_lft = INFINITY_LIFE_TIME,
3026 .valid_lft = INFINITY_LIFE_TIME,
3027 };
1da177e4
LT		 3028 struct in6_ifreq ireq;
3029 int err;
1ab1457c 3030
af31f412 3031 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1da177e4 3032 return -EPERM;
1ab1457c 3033
1da177e4
LT		 3034 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
3035 return -EFAULT;
3036
19b1518c
DA		 3037 cfg.pfx = &ireq.ifr6_addr;
3038 cfg.plen = ireq.ifr6_prefixlen;
3039
1da177e4 3040 rtnl_lock();
19b1518c 3041 err = inet6_addr_add(net, ireq.ifr6_ifindex, &cfg, NULL);
1da177e4
LT		 3042 rtnl_unlock();
3043 return err;
3044}
3045
af284937 3046int addrconf_del_ifaddr(struct net *net, void __user *arg)
1da177e4
LT		 3047{
3048 struct in6_ifreq ireq;
3049 int err;
1ab1457c 3050
af31f412 3051 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1da177e4
LT		 3052 return -EPERM;
3053
3054 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
3055 return -EFAULT;
3056
3057 rtnl_lock();
6046d5b4 3058 err = inet6_addr_del(net, ireq.ifr6_ifindex, 0, &ireq.ifr6_addr,
af284937 3059 ireq.ifr6_prefixlen);
1da177e4
LT		 3060 rtnl_unlock();
3061 return err;
3062}
3063
b5f348e5
IJ		 3064static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
3065 int plen, int scope)
3066{
3067 struct inet6_ifaddr *ifp;
e6464b8c
DA		 3068 struct ifa6_config cfg = {
3069 .pfx = addr,
3070 .plen = plen,
3071 .ifa_flags = IFA_F_PERMANENT,
3072 .valid_lft = INFINITY_LIFE_TIME,
3073 .preferred_lft = INFINITY_LIFE_TIME,
3074 .scope = scope
3075 };
b5f348e5 3076
e6464b8c 3077 ifp = ipv6_add_addr(idev, &cfg, true, NULL);
b5f348e5
IJ		 3078 if (!IS_ERR(ifp)) {
3079 spin_lock_bh(&ifp->lock);
3080 ifp->flags &= ~IFA_F_TENTATIVE;
3081 spin_unlock_bh(&ifp->lock);
764d3be6 3082 rt_genid_bump_ipv6(dev_net(idev->dev));
b5f348e5
IJ		 3083 ipv6_ifa_notify(RTM_NEWADDR, ifp);
3084 in6_ifa_put(ifp);
3085 }
3086}
3087
07a93626 3088#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4
LT		 3089static void sit_add_v4_addrs(struct inet6_dev *idev)
3090{
1da177e4
LT		 3091 struct in6_addr addr;
3092 struct net_device *dev;
c346dca1 3093 struct net *net = dev_net(idev->dev);
929c9cf3 3094 int scope, plen;
f0e2acfa 3095 u32 pflags = 0;
1da177e4
LT		 3096
3097 ASSERT_RTNL();
3098
3099 memset(&addr, 0, sizeof(struct in6_addr));
3100 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
3101
3102 if (idev->dev->flags&IFF_POINTOPOINT) {
3103 addr.s6_addr32[0] = htonl(0xfe800000);
3104 scope = IFA_LINK;
929c9cf3 3105 plen = 64;
1da177e4
LT		 3106 } else {
3107 scope = IPV6_ADDR_COMPATv4;
929c9cf3 3108 plen = 96;
f0e2acfa 3109 pflags |= RTF_NONEXTHOP;
1da177e4
LT		 3110 }
3111
3112 if (addr.s6_addr32[3]) {
929c9cf3 3113 add_addr(idev, &addr, plen, scope);
8308f3ff 3114 addrconf_prefix_route(&addr, plen, 0, idev->dev, 0, pflags,
e500c6d3 3115 GFP_KERNEL);
1da177e4
LT		 3116 return;
3117 }
3118
6fda7350 3119 for_each_netdev(net, dev) {
8e5e8f30 3120 struct in_device *in_dev = __in_dev_get_rtnl(dev);
1da177e4 3121 if (in_dev && (dev->flags & IFF_UP)) {
8e5e8f30 3122 struct in_ifaddr *ifa;
1da177e4
LT		 3123 int flag = scope;
3124
cd5a411d 3125 in_dev_for_each_ifa_rtnl(ifa, in_dev) {
1da177e4
LT		 3126 addr.s6_addr32[3] = ifa->ifa_local;
3127
3128 if (ifa->ifa_scope == RT_SCOPE_LINK)
3129 continue;
3130 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
3131 if (idev->dev->flags&IFF_POINTOPOINT)
3132 continue;
3133 flag |= IFA_HOST;
3134 }
1da177e4 3135
b5f348e5 3136 add_addr(idev, &addr, plen, flag);
8308f3ff 3137 addrconf_prefix_route(&addr, plen, 0, idev->dev,
e500c6d3 3138 0, pflags, GFP_KERNEL);
1da177e4
LT		 3139 }
3140 }
1ab1457c 3141 }
1da177e4 3142}
0be669bb 3143#endif
1da177e4
LT		 3144
3145static void init_loopback(struct net_device *dev)
3146{
3147 struct inet6_dev *idev;
1da177e4
LT		 3148
3149 /* ::1 */
3150
3151 ASSERT_RTNL();
3152
e5d08d71 3153 idev = ipv6_find_idev(dev);
db0b99f5 3154 if (IS_ERR(idev)) {
91df42be 3155 pr_debug("%s: add_dev failed\n", __func__);
1da177e4
LT		 3156 return;
3157 }
3158
b5f348e5 3159 add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
1da177e4
LT		 3160}
3161
2ad3ed59
AA		 3162void addrconf_add_linklocal(struct inet6_dev *idev,
3163 const struct in6_addr *addr, u32 flags)
1da177e4 3164{
e6464b8c
DA		 3165 struct ifa6_config cfg = {
3166 .pfx = addr,
3167 .plen = 64,
3168 .ifa_flags = flags | IFA_F_PERMANENT,
3169 .valid_lft = INFINITY_LIFE_TIME,
3170 .preferred_lft = INFINITY_LIFE_TIME,
3171 .scope = IFA_LINK
3172 };
8e5e8f30 3173 struct inet6_ifaddr *ifp;
95c385b4
NH		 3174
3175#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
35e015e1
MC		 3176 if ((dev_net(idev->dev)->ipv6.devconf_all->optimistic_dad ||
3177 idev->cnf.optimistic_dad) &&
702beb87 3178 !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
e6464b8c 3179 cfg.ifa_flags |= IFA_F_OPTIMISTIC;
95c385b4 3180#endif
1da177e4 3181
e6464b8c 3182 ifp = ipv6_add_addr(idev, &cfg, true, NULL);
1da177e4 3183 if (!IS_ERR(ifp)) {
8308f3ff 3184 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, 0, idev->dev,
acb54e3c 3185 0, 0, GFP_ATOMIC);
cf22f9a2 3186 addrconf_dad_start(ifp);
1da177e4
LT		 3187 in6_ifa_put(ifp);
3188 }
3189}
2ad3ed59 3190EXPORT_SYMBOL_GPL(addrconf_add_linklocal);
1da177e4 3191
622c81d5
HFS		 3192static bool ipv6_reserved_interfaceid(struct in6_addr address)
3193{
3194 if ((address.s6_addr32[2] | address.s6_addr32[3]) == 0)
3195 return true;
3196
3197 if (address.s6_addr32[2] == htonl(0x02005eff) &&
3198 ((address.s6_addr32[3] & htonl(0xfe000000)) == htonl(0xfe000000)))
3199 return true;
3200
3201 if (address.s6_addr32[2] == htonl(0xfdffffff) &&
3202 ((address.s6_addr32[3] & htonl(0xffffff80)) == htonl(0xffffff80)))
3203 return true;
3204
3205 return false;
3206}
3207
3208static int ipv6_generate_stable_address(struct in6_addr *address,
3209 u8 dad_count,
3210 const struct inet6_dev *idev)
3211{
622c81d5 3212 static DEFINE_SPINLOCK(lock);
6b0b0fa2
EB		 3213 static __u32 digest[SHA1_DIGEST_WORDS];
3214 static __u32 workspace[SHA1_WORKSPACE_WORDS];
622c81d5
HFS		 3215
3216 static union {
6b0b0fa2 3217 char __data[SHA1_BLOCK_SIZE];
622c81d5
HFS		 3218 struct {
3219 struct in6_addr secret;
ff40217e 3220 __be32 prefix[2];
622c81d5
HFS		 3221 unsigned char hwaddr[MAX_ADDR_LEN];
3222 u8 dad_count;
3223 } __packed;
3224 } data;
3225
3226 struct in6_addr secret;
3227 struct in6_addr temp;
3228 struct net *net = dev_net(idev->dev);
3229
3230 BUILD_BUG_ON(sizeof(data.__data) != sizeof(data));
3231
3232 if (idev->cnf.stable_secret.initialized)
3233 secret = idev->cnf.stable_secret.secret;
3234 else if (net->ipv6.devconf_dflt->stable_secret.initialized)
3235 secret = net->ipv6.devconf_dflt->stable_secret.secret;
3236 else
3237 return -1;
3238
3239retry:
3240 spin_lock_bh(&lock);
3241
6b0b0fa2 3242 sha1_init(digest);
622c81d5
HFS		 3243 memset(&data, 0, sizeof(data));
3244 memset(workspace, 0, sizeof(workspace));
3245 memcpy(data.hwaddr, idev->dev->perm_addr, idev->dev->addr_len);
ff40217e
HFS		 3246 data.prefix[0] = address->s6_addr32[0];
3247 data.prefix[1] = address->s6_addr32[1];
622c81d5
HFS		 3248 data.secret = secret;
3249 data.dad_count = dad_count;
3250
6b0b0fa2 3251 sha1_transform(digest, data.__data, workspace);
622c81d5
HFS		 3252
3253 temp = *address;
ff40217e
HFS		 3254 temp.s6_addr32[2] = (__force __be32)digest[0];
3255 temp.s6_addr32[3] = (__force __be32)digest[1];
622c81d5
HFS		 3256
3257 spin_unlock_bh(&lock);
3258
3259 if (ipv6_reserved_interfaceid(temp)) {
3260 dad_count++;
1855b7c3 3261 if (dad_count > dev_net(idev->dev)->ipv6.sysctl.idgen_retries)
622c81d5
HFS		 3262 return -1;
3263 goto retry;
3264 }
3265
3266 *address = temp;
3267 return 0;
3268}
3269
cc9da6cc
BM		 3270static void ipv6_gen_mode_random_init(struct inet6_dev *idev)
3271{
3272 struct ipv6_stable_secret *s = &idev->cnf.stable_secret;
3273
3274 if (s->initialized)
3275 return;
3276 s = &idev->cnf.stable_secret;
3277 get_random_bytes(&s->secret, sizeof(s->secret));
3278 s->initialized = true;
3279}
3280
bc91b0f0
JP		 3281static void addrconf_addr_gen(struct inet6_dev *idev, bool prefix_route)
3282{
622c81d5
HFS		 3283 struct in6_addr addr;
3284
ca254490
DA		 3285 /* no link local addresses on L3 master devices */
3286 if (netif_is_l3_master(idev->dev))
3287 return;
3288
744fdc82
JW		 3289 /* no link local addresses on devices flagged as slaves */
3290 if (idev->dev->flags & IFF_SLAVE)
3291 return;
3292
622c81d5 3293 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
bc91b0f0 3294
d35a00b8 3295 switch (idev->cnf.addr_gen_mode) {
cc9da6cc
BM		 3296 case IN6_ADDR_GEN_MODE_RANDOM:
3297 ipv6_gen_mode_random_init(idev);
a8eceea8 3298 fallthrough;
cc9da6cc 3299 case IN6_ADDR_GEN_MODE_STABLE_PRIVACY:
622c81d5 3300 if (!ipv6_generate_stable_address(&addr, 0, idev))
64236f3f
HFS		 3301 addrconf_add_linklocal(idev, &addr,
3302 IFA_F_STABLE_PRIVACY);
622c81d5 3303 else if (prefix_route)
8308f3ff 3304 addrconf_prefix_route(&addr, 64, 0, idev->dev,
acb54e3c 3305 0, 0, GFP_KERNEL);
cc9da6cc
BM		 3306 break;
3307 case IN6_ADDR_GEN_MODE_EUI64:
bc91b0f0
JP		 3308 /* addrconf_add_linklocal also adds a prefix_route and we
3309 * only need to care about prefix routes if ipv6_generate_eui64
3310 * couldn't generate one.
3311 */
3312 if (ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) == 0)
64236f3f 3313 addrconf_add_linklocal(idev, &addr, 0);
bc91b0f0 3314 else if (prefix_route)
8308f3ff 3315 addrconf_prefix_route(&addr, 64, 0, idev->dev,
27b10608 3316 0, 0, GFP_KERNEL);
cc9da6cc
BM		 3317 break;
3318 case IN6_ADDR_GEN_MODE_NONE:
3319 default:
3320 /* will not add any link local address */
3321 break;
bc91b0f0
JP		 3322 }
3323}
3324
1da177e4
LT		 3325static void addrconf_dev_config(struct net_device *dev)
3326{
8e5e8f30 3327 struct inet6_dev *idev;
1da177e4
LT		 3328
3329 ASSERT_RTNL();
3330
74235a25
HX		 3331 if ((dev->type != ARPHRD_ETHER) &&
3332 (dev->type != ARPHRD_FDDI) &&
74235a25 3333 (dev->type != ARPHRD_ARCNET) &&
06a4c1c5 3334 (dev->type != ARPHRD_INFINIBAND) &&
e837735e 3335 (dev->type != ARPHRD_IEEE1394) &&
e74bccb8 3336 (dev->type != ARPHRD_TUNNEL6) &&
cc9da6cc 3337 (dev->type != ARPHRD_6LOWPAN) &&
45ce0fd1
FJ		 3338 (dev->type != ARPHRD_IP6GRE) &&
3339 (dev->type != ARPHRD_IPGRE) &&
3340 (dev->type != ARPHRD_TUNNEL) &&
9deb441c
SAK		 3341 (dev->type != ARPHRD_NONE) &&
3342 (dev->type != ARPHRD_RAWIP)) {
74235a25 3343 /* Alas, we support only Ethernet autoconfiguration. */
60380488
HL		 3344 idev = __in6_dev_get(dev);
3345 if (!IS_ERR_OR_NULL(idev) && dev->flags & IFF_UP &&
3346 dev->flags & IFF_MULTICAST)
3347 ipv6_mc_up(idev);
74235a25
HX		 3348 return;
3349 }
3350
1da177e4 3351 idev = addrconf_add_dev(dev);
64e724f6 3352 if (IS_ERR(idev))
1da177e4
LT		 3353 return;
3354
cc9da6cc
BM		 3355 /* this device type has no EUI support */
3356 if (dev->type == ARPHRD_NONE &&
d35a00b8
FJ		 3357 idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_EUI64)
3358 idev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_RANDOM;
cc9da6cc 3359
bc91b0f0 3360 addrconf_addr_gen(idev, false);
1da177e4
LT		 3361}
3362
07a93626 3363#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4
LT		 3364static void addrconf_sit_config(struct net_device *dev)
3365{
3366 struct inet6_dev *idev;
3367
3368 ASSERT_RTNL();
3369
1ab1457c
YH		 3370 /*
3371 * Configure the tunnel with one of our IPv4
3372 * addresses... we should configure all of
1da177e4
LT		 3373 * our v4 addrs in the tunnel
3374 */
3375
e5d08d71 3376 idev = ipv6_find_idev(dev);
db0b99f5 3377 if (IS_ERR(idev)) {
91df42be 3378 pr_debug("%s: add_dev failed\n", __func__);
1da177e4
LT		 3379 return;
3380 }
3381
c7dc89c0 3382 if (dev->priv_flags & IFF_ISATAP) {
bc91b0f0 3383 addrconf_addr_gen(idev, false);
c7dc89c0
FT		 3384 return;
3385 }
3386
1da177e4
LT		 3387 sit_add_v4_addrs(idev);
3388
62b54dd9 3389 if (dev->flags&IFF_POINTOPOINT)
1da177e4 3390 addrconf_add_mroute(dev);
1da177e4 3391}
0be669bb 3392#endif
1da177e4 3393
07a93626 3394#if IS_ENABLED(CONFIG_NET_IPGRE)
aee80b54 3395static void addrconf_gre_config(struct net_device *dev)
3396{
3397 struct inet6_dev *idev;
aee80b54 3398
aee80b54 3399 ASSERT_RTNL();
3400
e5d08d71 3401 idev = ipv6_find_idev(dev);
db0b99f5 3402 if (IS_ERR(idev)) {
91df42be 3403 pr_debug("%s: add_dev failed\n", __func__);
aee80b54 3404 return;
3405 }
3406
bc91b0f0 3407 addrconf_addr_gen(idev, true);
d9e4ce65
HFS		 3408 if (dev->flags & IFF_POINTOPOINT)
3409 addrconf_add_mroute(dev);
aee80b54 3410}
3411#endif
3412
afb1d4b5
DA		 3413static int fixup_permanent_addr(struct net *net,
3414 struct inet6_dev *idev,
f1705ec1
DA		 3415 struct inet6_ifaddr *ifp)
3416{
93c2fb25 3417 /* !fib6_node means the host route was removed from the
8048ced9
DA		 3418 * FIB, for example, if 'lo' device is taken down. In that
3419 * case regenerate the host route.
3420 */
93c2fb25 3421 if (!ifp->rt || !ifp->rt->fib6_node) {
360a9887 3422 struct fib6_info *f6i, *prev;
f1705ec1 3423
360a9887
DA		 3424 f6i = addrconf_f6i_alloc(net, idev, &ifp->addr, false,
3425 GFP_ATOMIC);
3426 if (IS_ERR(f6i))
3427 return PTR_ERR(f6i);
f1705ec1 3428
8048ced9
DA		 3429 /* ifp->rt can be accessed outside of rtnl */
3430 spin_lock(&ifp->lock);
3431 prev = ifp->rt;
360a9887 3432 ifp->rt = f6i;
8048ced9
DA		 3433 spin_unlock(&ifp->lock);
3434
93531c67 3435 fib6_info_release(prev);
f1705ec1
DA		 3436 }
3437
3438 if (!(ifp->flags & IFA_F_NOPREFIXROUTE)) {
3439 addrconf_prefix_route(&ifp->addr, ifp->prefix_len,
8308f3ff
DA		 3440 ifp->rt_priority, idev->dev, 0, 0,
3441 GFP_ATOMIC);
f1705ec1
DA		 3442 }
3443
6d717134
DA		 3444 if (ifp->state == INET6_IFADDR_STATE_PREDAD)
3445 addrconf_dad_start(ifp);
f1705ec1
DA		 3446
3447 return 0;
3448}
3449
afb1d4b5 3450static void addrconf_permanent_addr(struct net *net, struct net_device *dev)
f1705ec1
DA		 3451{
3452 struct inet6_ifaddr *ifp, *tmp;
3453 struct inet6_dev *idev;
3454
3455 idev = __in6_dev_get(dev);
3456 if (!idev)
3457 return;
3458
3459 write_lock_bh(&idev->lock);
3460
3461 list_for_each_entry_safe(ifp, tmp, &idev->addr_list, if_list) {
3462 if ((ifp->flags & IFA_F_PERMANENT) &&
afb1d4b5 3463 fixup_permanent_addr(net, idev, ifp) < 0) {
f1705ec1 3464 write_unlock_bh(&idev->lock);
e669b869 3465 in6_ifa_hold(ifp);
f1705ec1
DA		 3466 ipv6_del_addr(ifp);
3467 write_lock_bh(&idev->lock);
3468
3469 net_info_ratelimited("%s: Failed to add prefix route for address %pI6c; dropping\n",
3470 idev->dev->name, &ifp->addr);
3471 }
3472 }
3473
3474 write_unlock_bh(&idev->lock);
3475}
3476
1ab1457c 3477static int addrconf_notify(struct notifier_block *this, unsigned long event,
351638e7 3478 void *ptr)
1da177e4 3479{
351638e7 3480 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
896585d4 3481 struct netdev_notifier_change_info *change_info;
4f7f34ea 3482 struct netdev_notifier_changeupper_info *info;
748e2d93 3483 struct inet6_dev *idev = __in6_dev_get(dev);
60abc0be 3484 struct net *net = dev_net(dev);
c5e33bdd 3485 int run_pending = 0;
b217d616 3486 int err;
1da177e4 3487
e21e8467 3488 switch (event) {
45ba9dd2 3489 case NETDEV_REGISTER:
74235a25 3490 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
45ba9dd2 3491 idev = ipv6_add_dev(dev);
a317a2f1
WC		 3492 if (IS_ERR(idev))
3493 return notifier_from_errno(PTR_ERR(idev));
45ba9dd2
YH		 3494 }
3495 break;
bcdd553f 3496
b7b0b1d2
AD		 3497 case NETDEV_CHANGEMTU:
3498 /* if MTU under IPV6_MIN_MTU stop IPv6 on this interface. */
3499 if (dev->mtu < IPV6_MIN_MTU) {
60abc0be 3500 addrconf_ifdown(dev, dev != net->loopback_dev);
b7b0b1d2
AD		 3501 break;
3502 }
3503
3504 if (idev) {
3505 rt6_mtu_change(dev, dev->mtu);
3506 idev->cnf.mtu6 = dev->mtu;
3507 break;
3508 }
3509
3510 /* allocate new idev */
3511 idev = ipv6_add_dev(dev);
3512 if (IS_ERR(idev))
3513 break;
3514
3515 /* device is still not ready */
3516 if (!(idev->if_flags & IF_READY))
3517 break;
3518
3519 run_pending = 1;
a8eceea8 3520 fallthrough;
1da177e4 3521 case NETDEV_UP:
3c21edbd 3522 case NETDEV_CHANGE:
c2edacf8
JV		 3523 if (dev->flags & IFF_SLAVE)
3524 break;
3525
3ce62a84
WC		 3526 if (idev && idev->cnf.disable_ipv6)
3527 break;
3528
3c21edbd 3529 if (event == NETDEV_UP) {
38bd10c4 3530 /* restore routes for permanent addresses */
afb1d4b5 3531 addrconf_permanent_addr(net, dev);
38bd10c4 3532
1f372c7b 3533 if (!addrconf_link_ready(dev)) {
3c21edbd 3534 /* device is not ready yet. */
7c62b8dd
LR		 3535 pr_debug("ADDRCONF(NETDEV_UP): %s: link is not ready\n",
3536 dev->name);
3c21edbd
YH		 3537 break;
3538 }
99081049 3539
d31c7b8f
EP		 3540 if (!idev && dev->mtu >= IPV6_MIN_MTU)
3541 idev = ipv6_add_dev(dev);
3542
a317a2f1 3543 if (!IS_ERR_OR_NULL(idev)) {
99081049 3544 idev->if_flags |= IF_READY;
e3ec6cfc
BT		 3545 run_pending = 1;
3546 }
b7b0b1d2 3547 } else if (event == NETDEV_CHANGE) {
1f372c7b 3548 if (!addrconf_link_ready(dev)) {
3c21edbd 3549 /* device is still not ready. */
27c6fa73 3550 rt6_sync_down_dev(dev, event);
3c21edbd
YH		 3551 break;
3552 }
3553
896585d4 3554 if (!IS_ERR_OR_NULL(idev)) {
a088d1d7
LL		 3555 if (idev->if_flags & IF_READY) {
3556 /* device is already configured -
3557 * but resend MLD reports, we might
3558 * have roamed and need to update
3559 * multicast snooping switches
3560 */
3561 ipv6_mc_up(idev);
896585d4
HL		 3562 change_info = ptr;
3563 if (change_info->flags_changed & IFF_NOARP)
3564 addrconf_dad_run(idev, true);
27c6fa73 3565 rt6_sync_up(dev, RTNH_F_LINKDOWN);
3c21edbd 3566 break;
a088d1d7 3567 }
3c21edbd
YH		 3568 idev->if_flags |= IF_READY;
3569 }
3570
f3213831
JP		 3571 pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n",
3572 dev->name);
3c21edbd 3573
c5e33bdd 3574 run_pending = 1;
3c21edbd
YH		 3575 }
3576
e21e8467 3577 switch (dev->type) {
07a93626 3578#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4
LT		 3579 case ARPHRD_SIT:
3580 addrconf_sit_config(dev);
3581 break;
aee80b54 3582#endif
07a93626 3583#if IS_ENABLED(CONFIG_NET_IPGRE)
aee80b54 3584 case ARPHRD_IPGRE:
3585 addrconf_gre_config(dev);
3586 break;
0be669bb 3587#endif
1da177e4
LT		 3588 case ARPHRD_LOOPBACK:
3589 init_loopback(dev);
3590 break;
3591
3592 default:
3593 addrconf_dev_config(dev);
3594 break;
3ff50b79 3595 }
bcdd553f 3596
a317a2f1 3597 if (!IS_ERR_OR_NULL(idev)) {
c5e33bdd 3598 if (run_pending)
896585d4 3599 addrconf_dad_run(idev, false);
c5e33bdd 3600
2127d95a
IS		 3601 /* Device has an address by now */
3602 rt6_sync_up(dev, RTNH_F_DEAD);
3603
bcdd553f
SH		 3604 /*
3605 * If the MTU changed during the interface down,
3606 * when the interface up, the changed MTU must be
3607 * reflected in the idev as well as routers.
1da177e4 3608 */
bcdd553f
SH		 3609 if (idev->cnf.mtu6 != dev->mtu &&
3610 dev->mtu >= IPV6_MIN_MTU) {
1da177e4
LT		 3611 rt6_mtu_change(dev, dev->mtu);
3612 idev->cnf.mtu6 = dev->mtu;
3613 }
3614 idev->tstamp = jiffies;
3615 inet6_ifinfo_notify(RTM_NEWLINK, idev);
bcdd553f
SH		 3616
3617 /*
3618 * If the changed mtu during down is lower than
3619 * IPV6_MIN_MTU stop IPv6 on this interface.
1da177e4
LT		 3620 */
3621 if (dev->mtu < IPV6_MIN_MTU)
60abc0be 3622 addrconf_ifdown(dev, dev != net->loopback_dev);
1da177e4
LT		 3623 }
3624 break;
3625
1da177e4
LT		 3626 case NETDEV_DOWN:
3627 case NETDEV_UNREGISTER:
3628 /*
3629 * Remove all addresses from this interface.
3630 */
3631 addrconf_ifdown(dev, event != NETDEV_DOWN);
3632 break;
3c21edbd 3633
1da177e4 3634 case NETDEV_CHANGENAME:
1da177e4 3635 if (idev) {
5632c515 3636 snmp6_unregister_dev(idev);
408c4768 3637 addrconf_sysctl_unregister(idev);
a317a2f1 3638 err = addrconf_sysctl_register(idev);
b217d616
HX		 3639 if (err)
3640 return notifier_from_errno(err);
a317a2f1
WC		 3641 err = snmp6_register_dev(idev);
3642 if (err) {
3643 addrconf_sysctl_unregister(idev);
3644 return notifier_from_errno(err);
3645 }
5632c515 3646 }
1da177e4 3647 break;
bcdd553f 3648
93d9b7d7
JP		 3649 case NETDEV_PRE_TYPE_CHANGE:
3650 case NETDEV_POST_TYPE_CHANGE:
3ef0952c
AL		 3651 if (idev)
3652 addrconf_type_change(dev, event);
75c78500 3653 break;
4f7f34ea
DA		 3654
3655 case NETDEV_CHANGEUPPER:
3656 info = ptr;
3657
3658 /* flush all routes if dev is linked to or unlinked from
3659 * an L3 master device (e.g., VRF)
3660 */
3661 if (info->upper_dev && netif_is_l3_master(info->upper_dev))
ae79dbf6 3662 addrconf_ifdown(dev, false);
3ff50b79 3663 }
1da177e4
LT		 3664
3665 return NOTIFY_OK;
3666}
3667
3668/*
3669 * addrconf module should be notified of a device going up
3670 */
3671static struct notifier_block ipv6_dev_notf = {
3672 .notifier_call = addrconf_notify,
242d3a49 3673 .priority = ADDRCONF_NOTIFY_PRIORITY,
1da177e4
LT		 3674};
3675
93d9b7d7 3676static void addrconf_type_change(struct net_device *dev, unsigned long event)
75c78500
MS		 3677{
3678 struct inet6_dev *idev;
3679 ASSERT_RTNL();
3680
3681 idev = __in6_dev_get(dev);
3682
93d9b7d7 3683 if (event == NETDEV_POST_TYPE_CHANGE)
75c78500 3684 ipv6_mc_remap(idev);
93d9b7d7 3685 else if (event == NETDEV_PRE_TYPE_CHANGE)
75c78500
MS		 3686 ipv6_mc_unmap(idev);
3687}
3688
70af921d
DA		 3689static bool addr_is_local(const struct in6_addr *addr)
3690{
3691 return ipv6_addr_type(addr) &
3692 (IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK);
3693}
3694
ae79dbf6 3695static int addrconf_ifdown(struct net_device *dev, bool unregister)
1da177e4 3696{
ae79dbf6 3697 unsigned long event = unregister ? NETDEV_UNREGISTER : NETDEV_DOWN;
c346dca1 3698 struct net *net = dev_net(dev);
502a2ffd 3699 struct inet6_dev *idev;
f1705ec1 3700 struct inet6_ifaddr *ifa, *tmp;
0aef78aa 3701 bool keep_addr = false;
73a8bd74 3702 int state, i;
1da177e4
LT		 3703
3704 ASSERT_RTNL();
3705
4c981e28 3706 rt6_disable_ip(dev, event);
1da177e4
LT		 3707
3708 idev = __in6_dev_get(dev);
63159f29 3709 if (!idev)
1da177e4
LT		 3710 return -ENODEV;
3711
bcdd553f
SH		 3712 /*
3713 * Step 1: remove reference to ipv6 device from parent device.
3714 * Do not dev_put!
1da177e4 3715 */
ae79dbf6 3716 if (unregister) {
1da177e4 3717 idev->dead = 1;
8814c4b5
YH		 3718
3719 /* protected by rtnl_lock */
a9b3cd7f 3720 RCU_INIT_POINTER(dev->ip6_ptr, NULL);
1da177e4
LT		 3721
3722 /* Step 1.5: remove snmp6 entry */
3723 snmp6_unregister_dev(idev);
3724
3725 }
3726
f1705ec1
DA		 3727 /* combine the user config with event to determine if permanent
3728 * addresses are to be removed from address hash table
3729 */
ae79dbf6 3730 if (!unregister && !idev->cnf.disable_ipv6) {
0aef78aa
IV		 3731 /* aggregate the system setting and interface setting */
3732 int _keep_addr = net->ipv6.devconf_all->keep_addr_on_down;
3733
3734 if (!_keep_addr)
3735 _keep_addr = idev->cnf.keep_addr_on_down;
3736
3737 keep_addr = (_keep_addr > 0);
3738 }
f1705ec1 3739
73a8bd74
DM		 3740 /* Step 2: clear hash table */
3741 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3742 struct hlist_head *h = &inet6_addr_lst[i];
73a8bd74
DM		 3743
3744 spin_lock_bh(&addrconf_hash_lock);
67ba4152 3745restart:
b67bfe0d 3746 hlist_for_each_entry_rcu(ifa, h, addr_lst) {
73a8bd74 3747 if (ifa->idev == idev) {
c15b1cca 3748 addrconf_del_dad_work(ifa);
f1705ec1
DA		 3749 /* combined flag + permanent flag decide if
3750 * address is retained on a down event
3751 */
3752 if (!keep_addr ||
70af921d
DA		 3753 !(ifa->flags & IFA_F_PERMANENT) ||
3754 addr_is_local(&ifa->addr)) {
f1705ec1
DA		 3755 hlist_del_init_rcu(&ifa->addr_lst);
3756 goto restart;
3757 }
73a8bd74
DM		 3758 }
3759 }
3760 spin_unlock_bh(&addrconf_hash_lock);
3761 }
3762
1da177e4
LT		 3763 write_lock_bh(&idev->lock);
3764
b7b1bfce
HFS		 3765 addrconf_del_rs_timer(idev);
3766
bcdd553f 3767 /* Step 2: clear flags for stateless addrconf */
ae79dbf6 3768 if (!unregister)
3c21edbd 3769 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
1da177e4 3770
bcdd553f 3771 /* Step 3: clear tempaddr list */
372e6c8f 3772 while (!list_empty(&idev->tempaddr_list)) {
3773 ifa = list_first_entry(&idev->tempaddr_list,
3774 struct inet6_ifaddr, tmp_list);
3775 list_del(&ifa->tmp_list);
1da177e4
LT		 3776 write_unlock_bh(&idev->lock);
3777 spin_lock_bh(&ifa->lock);
3778
3779 if (ifa->ifpub) {
3780 in6_ifa_put(ifa->ifpub);
3781 ifa->ifpub = NULL;
3782 }
3783 spin_unlock_bh(&ifa->lock);
3784 in6_ifa_put(ifa);
3785 write_lock_bh(&idev->lock);
3786 }
8f37ada5 3787
f1705ec1 3788 list_for_each_entry_safe(ifa, tmp, &idev->addr_list, if_list) {
8d1c802b 3789 struct fib6_info *rt = NULL;
a2d6cbb0 3790 bool keep;
38bd10c4 3791
f1705ec1 3792 addrconf_del_dad_work(ifa);
84e8b803 3793
a2d6cbb0
RV		 3794 keep = keep_addr && (ifa->flags & IFA_F_PERMANENT) &&
3795 !addr_is_local(&ifa->addr);
a2d6cbb0 3796
73a8bd74 3797 write_unlock_bh(&idev->lock);
8e8e676d 3798 spin_lock_bh(&ifa->lock);
f1705ec1 3799
a2d6cbb0 3800 if (keep) {
f1705ec1
DA		 3801 /* set state to skip the notifier below */
3802 state = INET6_IFADDR_STATE_DEAD;
6d717134 3803 ifa->state = INET6_IFADDR_STATE_PREDAD;
f1705ec1
DA		 3804 if (!(ifa->flags & IFA_F_NODAD))
3805 ifa->flags |= IFA_F_TENTATIVE;
38bd10c4
DA		 3806
3807 rt = ifa->rt;
3808 ifa->rt = NULL;
f1705ec1
DA		 3809 } else {
3810 state = ifa->state;
3811 ifa->state = INET6_IFADDR_STATE_DEAD;
f1705ec1
DA		 3812 }
3813
8e8e676d 3814 spin_unlock_bh(&ifa->lock);
9d82ca98 3815
38bd10c4 3816 if (rt)
11dd74b3 3817 ip6_del_rt(net, rt, false);
38bd10c4 3818
73a8bd74
DM		 3819 if (state != INET6_IFADDR_STATE_DEAD) {
3820 __ipv6_ifa_notify(RTM_DELADDR, ifa);
f88c91dd 3821 inet6addr_notifier_call_chain(NETDEV_DOWN, ifa);
ea06f717
MM		 3822 } else {
3823 if (idev->cnf.forwarding)
3824 addrconf_leave_anycast(ifa);
3825 addrconf_leave_solict(ifa->idev, &ifa->addr);
27bdb2ab 3826 }
8f37ada5 3827
73a8bd74 3828 write_lock_bh(&idev->lock);
8ef802aa
ED		 3829 if (!keep) {
3830 list_del_rcu(&ifa->if_list);
3831 in6_ifa_put(ifa);
3832 }
73a8bd74 3833 }
8f37ada5 3834
1da177e4
LT		 3835 write_unlock_bh(&idev->lock);
3836
381f4dca 3837 /* Step 5: Discard anycast and multicast list */
ae79dbf6 3838 if (unregister) {
381f4dca 3839 ipv6_ac_destroy_dev(idev);
1da177e4 3840 ipv6_mc_destroy_dev(idev);
381f4dca 3841 } else {
1da177e4 3842 ipv6_mc_down(idev);
381f4dca 3843 }
1da177e4 3844
1da177e4 3845 idev->tstamp = jiffies;
1ab1457c 3846
bcdd553f 3847 /* Last: Shot the device (if unregistered) */
ae79dbf6 3848 if (unregister) {
408c4768 3849 addrconf_sysctl_unregister(idev);
1da177e4
LT		 3850 neigh_parms_release(&nd_tbl, idev->nd_parms);
3851 neigh_ifdown(&nd_tbl, dev);
3852 in6_dev_put(idev);
3853 }
3854 return 0;
3855}
3856
e99e88a9 3857static void addrconf_rs_timer(struct timer_list *t)
1da177e4 3858{
e99e88a9 3859 struct inet6_dev *idev = from_timer(idev, t, rs_timer);
caf92bc4 3860 struct net_device *dev = idev->dev;
b7b1bfce 3861 struct in6_addr lladdr;
1da177e4 3862
b7b1bfce 3863 write_lock(&idev->lock);
5b2a1953 3864 if (idev->dead || !(idev->if_flags & IF_READY))
1da177e4
LT		 3865 goto out;
3866
9ba2add3 3867 if (!ipv6_accept_ra(idev))
5b2a1953 3868 goto out;
3869
3870 /* Announcement received after solicitation was sent */
3871 if (idev->if_flags & IF_RA_RCVD)
1da177e4 3872 goto out;
1da177e4 3873
bd11f074 3874 if (idev->rs_probes++ < idev->cnf.rtr_solicits || idev->cnf.rtr_solicits < 0) {
caf92bc4
CW		 3875 write_unlock(&idev->lock);
3876 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
3877 ndisc_send_rs(dev, &lladdr,
b7b1bfce
HFS		 3878 &in6addr_linklocal_allrouters);
3879 else
caf92bc4 3880 goto put;
1da177e4 3881
caf92bc4 3882 write_lock(&idev->lock);
bd11f074
MŻ		 3883 idev->rs_interval = rfc3315_s14_backoff_update(
3884 idev->rs_interval, idev->cnf.rtr_solicit_max_interval);
b7b1bfce
HFS		 3885 /* The wait after the last probe can be shorter */
3886 addrconf_mod_rs_timer(idev, (idev->rs_probes ==
3887 idev->cnf.rtr_solicits) ?
3888 idev->cnf.rtr_solicit_delay :
bd11f074 3889 idev->rs_interval);
1da177e4 3890 } else {
1da177e4
LT		 3891 /*
3892 * Note: we do not support deprecated "all on-link"
3893 * assumption any longer.
3894 */
91df42be 3895 pr_debug("%s: no IPv6 routers present\n", idev->dev->name);
1da177e4
LT		 3896 }
3897
3898out:
b7b1bfce 3899 write_unlock(&idev->lock);
caf92bc4 3900put:
b7b1bfce 3901 in6_dev_put(idev);
1da177e4
LT		 3902}
3903
3904/*
3905 * Duplicate Address Detection
3906 */
3c21edbd
YH		 3907static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
3908{
3909 unsigned long rand_num;
3910 struct inet6_dev *idev = ifp->idev;
adc176c5 3911 u64 nonce;
3c21edbd 3912
95c385b4
NH		 3913 if (ifp->flags & IFA_F_OPTIMISTIC)
3914 rand_num = 0;
3915 else
63862b5b 3916 rand_num = prandom_u32() % (idev->cnf.rtr_solicit_delay ? : 1);
95c385b4 3917
adc176c5
EN		 3918 nonce = 0;
3919 if (idev->cnf.enhanced_dad ||
3920 dev_net(idev->dev)->ipv6.devconf_all->enhanced_dad) {
3921 do
3922 get_random_bytes(&nonce, 6);
3923 while (nonce == 0);
3924 }
3925 ifp->dad_nonce = nonce;
b7b1bfce 3926 ifp->dad_probes = idev->cnf.dad_transmits;
c15b1cca 3927 addrconf_mod_dad_work(ifp, rand_num);
3c21edbd
YH		 3928}
3929
c15b1cca 3930static void addrconf_dad_begin(struct inet6_ifaddr *ifp)
1da177e4
LT		 3931{
3932 struct inet6_dev *idev = ifp->idev;
3933 struct net_device *dev = idev->dev;
764d3be6 3934 bool bump_id, notify = false;
afb1d4b5 3935 struct net *net;
1da177e4
LT		 3936
3937 addrconf_join_solict(dev, &ifp->addr);
3938
63862b5b 3939 prandom_seed((__force u32) ifp->addr.s6_addr32[3]);
1da177e4
LT		 3940
3941 read_lock_bh(&idev->lock);
622ccdf1 3942 spin_lock(&ifp->lock);
e9d3e084 3943 if (ifp->state == INET6_IFADDR_STATE_DEAD)
1da177e4 3944 goto out;
1da177e4 3945
afb1d4b5 3946 net = dev_net(dev);
1da177e4 3947 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
afb1d4b5 3948 (net->ipv6.devconf_all->accept_dad < 1 &&
a2d3f3e3 3949 idev->cnf.accept_dad < 1) ||
55ebaef1
NT		 3950 !(ifp->flags&IFA_F_TENTATIVE) ||
3951 ifp->flags & IFA_F_NODAD) {
c76fe2d9
DA		 3952 bool send_na = false;
3953
3954 if (ifp->flags & IFA_F_TENTATIVE &&
3955 !(ifp->flags & IFA_F_OPTIMISTIC))
3956 send_na = true;
764d3be6 3957 bump_id = ifp->flags & IFA_F_TENTATIVE;
cc411d0b 3958 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
21809faf 3959 spin_unlock(&ifp->lock);
1da177e4
LT		 3960 read_unlock_bh(&idev->lock);
3961
c76fe2d9 3962 addrconf_dad_completed(ifp, bump_id, send_na);
1da177e4
LT		 3963 return;
3964 }
3965
6732bade 3966 if (!(idev->if_flags & IF_READY)) {
21809faf 3967 spin_unlock(&ifp->lock);
6732bade 3968 read_unlock_bh(&idev->lock);
3c21edbd 3969 /*
590a9887 3970 * If the device is not ready:
3c21edbd
YH		 3971 * - keep it tentative if it is a permanent address.
3972 * - otherwise, kill it.
3973 */
3974 in6_ifa_hold(ifp);
cc411d0b 3975 addrconf_dad_stop(ifp, 0);
6732bade 3976 return;
3c21edbd 3977 }
95c385b4
NH		 3978
3979 /*
3980 * Optimistic nodes can start receiving
3981 * Frames right away
3982 */
7fd2561e 3983 if (ifp->flags & IFA_F_OPTIMISTIC) {
afb1d4b5
DA		 3984 ip6_ins_rt(net, ifp->rt);
3985 if (ipv6_use_optimistic_addr(net, idev)) {
7fd2561e
EK		 3986 /* Because optimistic nodes can use this address,
3987 * notify listeners. If DAD fails, RTM_DELADDR is sent.
3988 */
16186a82 3989 notify = true;
7fd2561e
EK		 3990 }
3991 }
95c385b4 3992
6732bade 3993 addrconf_dad_kick(ifp);
1da177e4 3994out:
622ccdf1 3995 spin_unlock(&ifp->lock);
1da177e4 3996 read_unlock_bh(&idev->lock);
16186a82 3997 if (notify)
3998 ipv6_ifa_notify(RTM_NEWADDR, ifp);
1da177e4
LT		 3999}
4000
c15b1cca 4001static void addrconf_dad_start(struct inet6_ifaddr *ifp)
1da177e4 4002{
c15b1cca
HFS		 4003 bool begin_dad = false;
4004
8e8e676d 4005 spin_lock_bh(&ifp->lock);
c15b1cca
HFS		 4006 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
4007 ifp->state = INET6_IFADDR_STATE_PREDAD;
4008 begin_dad = true;
4009 }
8e8e676d 4010 spin_unlock_bh(&ifp->lock);
c15b1cca
HFS		 4011
4012 if (begin_dad)
4013 addrconf_mod_dad_work(ifp, 0);
4014}
4015
4016static void addrconf_dad_work(struct work_struct *w)
4017{
4018 struct inet6_ifaddr *ifp = container_of(to_delayed_work(w),
4019 struct inet6_ifaddr,
4020 dad_work);
1da177e4 4021 struct inet6_dev *idev = ifp->idev;
764d3be6 4022 bool bump_id, disable_ipv6 = false;
1da177e4
LT		 4023 struct in6_addr mcaddr;
4024
c15b1cca
HFS		 4025 enum {
4026 DAD_PROCESS,
4027 DAD_BEGIN,
4028 DAD_ABORT,
4029 } action = DAD_PROCESS;
4030
4031 rtnl_lock();
4032
8e8e676d 4033 spin_lock_bh(&ifp->lock);
c15b1cca
HFS		 4034 if (ifp->state == INET6_IFADDR_STATE_PREDAD) {
4035 action = DAD_BEGIN;
4036 ifp->state = INET6_IFADDR_STATE_DAD;
4037 } else if (ifp->state == INET6_IFADDR_STATE_ERRDAD) {
4038 action = DAD_ABORT;
4039 ifp->state = INET6_IFADDR_STATE_POSTDAD;
85b51b12 4040
35e015e1
MC		 4041 if ((dev_net(idev->dev)->ipv6.devconf_all->accept_dad > 1 ||
4042 idev->cnf.accept_dad > 1) &&
4043 !idev->cnf.disable_ipv6 &&
85b51b12
MM		 4044 !(ifp->flags & IFA_F_STABLE_PRIVACY)) {
4045 struct in6_addr addr;
4046
4047 addr.s6_addr32[0] = htonl(0xfe800000);
4048 addr.s6_addr32[1] = 0;
4049
4050 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
4051 ipv6_addr_equal(&ifp->addr, &addr)) {
4052 /* DAD failed for link-local based on MAC */
4053 idev->cnf.disable_ipv6 = 1;
4054
4055 pr_info("%s: IPv6 being disabled!\n",
4056 ifp->idev->dev->name);
4057 disable_ipv6 = true;
4058 }
4059 }
c15b1cca 4060 }
8e8e676d 4061 spin_unlock_bh(&ifp->lock);
c15b1cca
HFS		 4062
4063 if (action == DAD_BEGIN) {
4064 addrconf_dad_begin(ifp);
4065 goto out;
4066 } else if (action == DAD_ABORT) {
751eb6b6 4067 in6_ifa_hold(ifp);
c15b1cca 4068 addrconf_dad_stop(ifp, 1);
85b51b12 4069 if (disable_ipv6)
ae79dbf6 4070 addrconf_ifdown(idev->dev, false);
c15b1cca
HFS		 4071 goto out;
4072 }
4073
b7b1bfce 4074 if (!ifp->dad_probes && addrconf_dad_end(ifp))
f2344a13
HX		 4075 goto out;
4076
c15b1cca 4077 write_lock_bh(&idev->lock);
122e4519 4078 if (idev->dead || !(idev->if_flags & IF_READY)) {
c15b1cca 4079 write_unlock_bh(&idev->lock);
1da177e4
LT		 4080 goto out;
4081 }
21809faf 4082
4083 spin_lock(&ifp->lock);
622ccdf1
HX		 4084 if (ifp->state == INET6_IFADDR_STATE_DEAD) {
4085 spin_unlock(&ifp->lock);
c15b1cca 4086 write_unlock_bh(&idev->lock);
622ccdf1
HX		 4087 goto out;
4088 }
4089
b7b1bfce 4090 if (ifp->dad_probes == 0) {
c76fe2d9
DA		 4091 bool send_na = false;
4092
1da177e4
LT		 4093 /*
4094 * DAD was successful
4095 */
4096
c76fe2d9
DA		 4097 if (ifp->flags & IFA_F_TENTATIVE &&
4098 !(ifp->flags & IFA_F_OPTIMISTIC))
4099 send_na = true;
764d3be6 4100 bump_id = ifp->flags & IFA_F_TENTATIVE;
cc411d0b 4101 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
21809faf 4102 spin_unlock(&ifp->lock);
c15b1cca 4103 write_unlock_bh(&idev->lock);
1da177e4 4104
c76fe2d9 4105 addrconf_dad_completed(ifp, bump_id, send_na);
1da177e4
LT		 4106
4107 goto out;
4108 }
4109
b7b1bfce 4110 ifp->dad_probes--;
c15b1cca 4111 addrconf_mod_dad_work(ifp,
19e16d22
HL		 4112 max(NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME),
4113 HZ/100));
21809faf 4114 spin_unlock(&ifp->lock);
c15b1cca 4115 write_unlock_bh(&idev->lock);
1da177e4
LT		 4116
4117 /* send a neighbour solicitation for our addr */
1da177e4 4118 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
adc176c5
EN		 4119 ndisc_send_ns(ifp->idev->dev, &ifp->addr, &mcaddr, &in6addr_any,
4120 ifp->dad_nonce);
1da177e4
LT		 4121out:
4122 in6_ifa_put(ifp);
c15b1cca 4123 rtnl_unlock();
1da177e4
LT		 4124}
4125
11ffff75
HFS		 4126/* ifp->idev must be at least read locked */
4127static bool ipv6_lonely_lladdr(struct inet6_ifaddr *ifp)
4128{
4129 struct inet6_ifaddr *ifpiter;
4130 struct inet6_dev *idev = ifp->idev;
4131
602582ca
HFS		 4132 list_for_each_entry_reverse(ifpiter, &idev->addr_list, if_list) {
4133 if (ifpiter->scope > IFA_LINK)
4134 break;
11ffff75
HFS		 4135 if (ifp != ifpiter && ifpiter->scope == IFA_LINK &&
4136 (ifpiter->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE|
4137 IFA_F_OPTIMISTIC|IFA_F_DADFAILED)) ==
4138 IFA_F_PERMANENT)
4139 return false;
4140 }
4141 return true;
4142}
4143
c76fe2d9
DA		 4144static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id,
4145 bool send_na)
1da177e4 4146{
e21e8467 4147 struct net_device *dev = ifp->idev->dev;
b7b1bfce 4148 struct in6_addr lladdr;
b173ee48 4149 bool send_rs, send_mld;
b7b1bfce 4150
c15b1cca 4151 addrconf_del_dad_work(ifp);
1da177e4
LT		 4152
4153 /*
4154 * Configure the address for reception. Now it is valid.
4155 */
4156
4157 ipv6_ifa_notify(RTM_NEWADDR, ifp);
4158
026359bc
TA		 4159 /* If added prefix is link local and we are prepared to process
4160 router advertisements, start sending router solicitations.
1da177e4
LT		 4161 */
4162
1ec047eb 4163 read_lock_bh(&ifp->idev->lock);
11ffff75 4164 send_mld = ifp->scope == IFA_LINK && ipv6_lonely_lladdr(ifp);
b173ee48
HFS		 4165 send_rs = send_mld &&
4166 ipv6_accept_ra(ifp->idev) &&
bd11f074 4167 ifp->idev->cnf.rtr_solicits != 0 &&
b173ee48 4168 (dev->flags&IFF_LOOPBACK) == 0;
1ec047eb
HFS		 4169 read_unlock_bh(&ifp->idev->lock);
4170
b173ee48
HFS		 4171 /* While dad is in progress mld report's source address is in6_addrany.
4172 * Resend with proper ll now.
4173 */
4174 if (send_mld)
4175 ipv6_mc_dad_complete(ifp->idev);
4176
c76fe2d9
DA		 4177 /* send unsolicited NA if enabled */
4178 if (send_na &&
4179 (ifp->idev->cnf.ndisc_notify ||
4180 dev_net(dev)->ipv6.devconf_all->ndisc_notify)) {
4181 ndisc_send_na(dev, &in6addr_linklocal_allnodes, &ifp->addr,
4182 /*router=*/ !!ifp->idev->cnf.forwarding,
4183 /*solicited=*/ false, /*override=*/ true,
4184 /*inc_opt=*/ true);
4185 }
4186
1ec047eb 4187 if (send_rs) {
1da177e4
LT		 4188 /*
4189 * If a host as already performed a random delay
4190 * [...] as part of DAD [...] there is no need
4191 * to delay again before sending the first RS
4192 */
1ec047eb 4193 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
b7b1bfce 4194 return;
1ec047eb 4195 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters);
1da177e4 4196
b7b1bfce
HFS		 4197 write_lock_bh(&ifp->idev->lock);
4198 spin_lock(&ifp->lock);
bd11f074
MŻ		 4199 ifp->idev->rs_interval = rfc3315_s14_backoff_init(
4200 ifp->idev->cnf.rtr_solicit_interval);
b7b1bfce 4201 ifp->idev->rs_probes = 1;
1da177e4 4202 ifp->idev->if_flags |= IF_RS_SENT;
bd11f074 4203 addrconf_mod_rs_timer(ifp->idev, ifp->idev->rs_interval);
b7b1bfce
HFS		 4204 spin_unlock(&ifp->lock);
4205 write_unlock_bh(&ifp->idev->lock);
1da177e4 4206 }
764d3be6
PA		 4207
4208 if (bump_id)
4209 rt_genid_bump_ipv6(dev_net(dev));
a11a7f71
MH		 4210
4211 /* Make sure that a new temporary address will be created
4212 * before this temporary address becomes deprecated.
4213 */
4214 if (ifp->flags & IFA_F_TEMPORARY)
4215 addrconf_verify_rtnl();
1da177e4
LT		 4216}
4217
896585d4 4218static void addrconf_dad_run(struct inet6_dev *idev, bool restart)
e21e8467 4219{
c5e33bdd
YH		 4220 struct inet6_ifaddr *ifp;
4221
4222 read_lock_bh(&idev->lock);
502a2ffd 4223 list_for_each_entry(ifp, &idev->addr_list, if_list) {
21809faf 4224 spin_lock(&ifp->lock);
896585d4
HL		 4225 if ((ifp->flags & IFA_F_TENTATIVE &&
4226 ifp->state == INET6_IFADDR_STATE_DAD) || restart) {
4227 if (restart)
4228 ifp->state = INET6_IFADDR_STATE_PREDAD;
f2344a13 4229 addrconf_dad_kick(ifp);
896585d4 4230 }
21809faf 4231 spin_unlock(&ifp->lock);
c5e33bdd
YH		 4232 }
4233 read_unlock_bh(&idev->lock);
4234}
4235
1da177e4
LT		 4236#ifdef CONFIG_PROC_FS
4237struct if6_iter_state {
3c40090a 4238 struct seq_net_private p;
1da177e4 4239 int bucket;
1d578303 4240 int offset;
1da177e4
LT		 4241};
4242
1d578303 4243static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos)
1da177e4 4244{
1da177e4 4245 struct if6_iter_state *state = seq->private;
1218854a 4246 struct net *net = seq_file_net(seq);
a5c1d98f 4247 struct inet6_ifaddr *ifa = NULL;
1d578303 4248 int p = 0;
1da177e4 4249
1d578303
MM		 4250 /* initial bucket if pos is 0 */
4251 if (pos == 0) {
4252 state->bucket = 0;
4253 state->offset = 0;
4254 }
4255
4256 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
a5c1d98f 4257 hlist_for_each_entry_rcu(ifa, &inet6_addr_lst[state->bucket],
1d578303 4258 addr_lst) {
9f0d3c27
ED		 4259 if (!net_eq(dev_net(ifa->idev->dev), net))
4260 continue;
1d578303
MM		 4261 /* sync with offset */
4262 if (p < state->offset) {
4263 p++;
4264 continue;
4265 }
9f0d3c27 4266 return ifa;
1d578303
MM		 4267 }
4268
4269 /* prepare for next bucket */
4270 state->offset = 0;
4271 p = 0;
1da177e4 4272 }
c2e21293 4273 return NULL;
1da177e4
LT		 4274}
4275
c2e21293 4276static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
4277 struct inet6_ifaddr *ifa)
1da177e4
LT		 4278{
4279 struct if6_iter_state *state = seq->private;
1218854a 4280 struct net *net = seq_file_net(seq);
1da177e4 4281
a5c1d98f 4282 hlist_for_each_entry_continue_rcu(ifa, addr_lst) {
9f0d3c27
ED		 4283 if (!net_eq(dev_net(ifa->idev->dev), net))
4284 continue;
1d578303 4285 state->offset++;
9f0d3c27 4286 return ifa;
1d578303 4287 }
3c40090a 4288
86f9bd1f 4289 state->offset = 0;
c2e21293 4290 while (++state->bucket < IN6_ADDR_HSIZE) {
a5c1d98f 4291 hlist_for_each_entry_rcu(ifa,
c2e21293 4292 &inet6_addr_lst[state->bucket], addr_lst) {
9f0d3c27
ED		 4293 if (!net_eq(dev_net(ifa->idev->dev), net))
4294 continue;
9f0d3c27 4295 return ifa;
c2e21293 4296 }
1da177e4 4297 }
3c40090a 4298
c2e21293 4299 return NULL;
1da177e4
LT		 4300}
4301
1da177e4 4302static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
a5c1d98f 4303 __acquires(rcu)
1da177e4 4304{
a5c1d98f 4305 rcu_read_lock();
1d578303 4306 return if6_get_first(seq, *pos);
1da177e4
LT		 4307}
4308
4309static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
4310{
4311 struct inet6_ifaddr *ifa;
4312
4313 ifa = if6_get_next(seq, v);
4314 ++*pos;
4315 return ifa;
4316}
4317
4318static void if6_seq_stop(struct seq_file *seq, void *v)
a5c1d98f 4319 __releases(rcu)
1da177e4 4320{
a5c1d98f 4321 rcu_read_unlock();
1da177e4
LT		 4322}
4323
4324static int if6_seq_show(struct seq_file *seq, void *v)
4325{
4326 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
971a351c 4327 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
b071195d 4328 &ifp->addr,
1da177e4
LT		 4329 ifp->idev->dev->ifindex,
4330 ifp->prefix_len,
4331 ifp->scope,
971a351c 4332 (u8) ifp->flags,
1da177e4
LT		 4333 ifp->idev->dev->name);
4334 return 0;
4335}
4336
56b3d975 4337static const struct seq_operations if6_seq_ops = {
1da177e4
LT		 4338 .start = if6_seq_start,
4339 .next = if6_seq_next,
4340 .show = if6_seq_show,
4341 .stop = if6_seq_stop,
4342};
4343
2c8c1e72 4344static int __net_init if6_proc_net_init(struct net *net)
1da177e4 4345{
c3506372
CH		 4346 if (!proc_create_net("if_inet6", 0444, net->proc_net, &if6_seq_ops,
4347 sizeof(struct if6_iter_state)))
1da177e4
LT		 4348 return -ENOMEM;
4349 return 0;
4350}
4351
2c8c1e72 4352static void __net_exit if6_proc_net_exit(struct net *net)
3c40090a 4353{
ece31ffd 4354 remove_proc_entry("if_inet6", net->proc_net);
3c40090a
DL		 4355}
4356
4357static struct pernet_operations if6_proc_net_ops = {
67ba4152
IM		 4358 .init = if6_proc_net_init,
4359 .exit = if6_proc_net_exit,
3c40090a
DL		 4360};
4361
4362int __init if6_proc_init(void)
4363{
4364 return register_pernet_subsys(&if6_proc_net_ops);
4365}
4366
1da177e4
LT		 4367void if6_proc_exit(void)
4368{
3c40090a 4369 unregister_pernet_subsys(&if6_proc_net_ops);
1da177e4
LT		 4370}
4371#endif /* CONFIG_PROC_FS */
4372
07a93626 4373#if IS_ENABLED(CONFIG_IPV6_MIP6)
3b9f9a1c 4374/* Check if address is a home address configured on any interface. */
b71d1d42 4375int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr)
3b9f9a1c 4376{
3f27fb23 4377 unsigned int hash = inet6_addr_hash(net, addr);
c2e21293 4378 struct inet6_ifaddr *ifp = NULL;
3f27fb23 4379 int ret = 0;
c2e21293 4380
4e5f47ab
ED		 4381 rcu_read_lock();
4382 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
878628fb 4383 if (!net_eq(dev_net(ifp->idev->dev), net))
389f6612 4384 continue;
caad295f 4385 if (ipv6_addr_equal(&ifp->addr, addr) &&
3b9f9a1c
NT		 4386 (ifp->flags & IFA_F_HOMEADDRESS)) {
4387 ret = 1;
4388 break;
4389 }
4390 }
4e5f47ab 4391 rcu_read_unlock();
3b9f9a1c
NT		 4392 return ret;
4393}
4394#endif
4395
f37c6059
AA		 4396/* RFC6554 has some algorithm to avoid loops in segment routing by
4397 * checking if the segments contains any of a local interface address.
4398 *
4399 * Quote:
4400 *
4401 * To detect loops in the SRH, a router MUST determine if the SRH
4402 * includes multiple addresses assigned to any interface on that router.
4403 * If such addresses appear more than once and are separated by at least
4404 * one address not assigned to that router.
4405 */
4406int ipv6_chk_rpl_srh_loop(struct net *net, const struct in6_addr *segs,
4407 unsigned char nsegs)
4408{
4409 const struct in6_addr *addr;
4410 int i, ret = 0, found = 0;
4411 struct inet6_ifaddr *ifp;
4412 bool separated = false;
4413 unsigned int hash;
4414 bool hash_found;
4415
4416 rcu_read_lock();
4417 for (i = 0; i < nsegs; i++) {
4418 addr = &segs[i];
4419 hash = inet6_addr_hash(net, addr);
4420
4421 hash_found = false;
4422 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
4423 if (!net_eq(dev_net(ifp->idev->dev), net))
4424 continue;
4425
4426 if (ipv6_addr_equal(&ifp->addr, addr)) {
4427 hash_found = true;
4428 break;
4429 }
4430 }
4431
4432 if (hash_found) {
4433 if (found > 1 && separated) {
4434 ret = 1;
4435 break;
4436 }
4437
4438 separated = false;
4439 found++;
4440 } else {
4441 separated = true;
4442 }
4443 }
4444 rcu_read_unlock();
4445
4446 return ret;
4447}
4448
1da177e4
LT		 4449/*
4450 * Periodic address status verification
4451 */
4452
c15b1cca 4453static void addrconf_verify_rtnl(void)
1da177e4 4454{
b2db7564 4455 unsigned long now, next, next_sec, next_sched;
1da177e4 4456 struct inet6_ifaddr *ifp;
1da177e4
LT		 4457 int i;
4458
c15b1cca
HFS		 4459 ASSERT_RTNL();
4460
5c578aed 4461 rcu_read_lock_bh();
1da177e4 4462 now = jiffies;
b2db7564 4463 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
1da177e4 4464
c15b1cca 4465 cancel_delayed_work(&addr_chk_work);
1da177e4 4466
bcdd553f 4467 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
1da177e4 4468restart:
c15b1cca 4469 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[i], addr_lst) {
1da177e4 4470 unsigned long age;
1da177e4 4471
fad8da3e
YA		 4472 /* When setting preferred_lft to a value not zero or
4473 * infinity, while valid_lft is infinity
4474 * IFA_F_PERMANENT has a non-infinity life time.
4475 */
4476 if ((ifp->flags & IFA_F_PERMANENT) &&
4477 (ifp->prefered_lft == INFINITY_LIFE_TIME))
1da177e4
LT		 4478 continue;
4479
4480 spin_lock(&ifp->lock);
b2db7564
YH		 4481 /* We try to batch several events at once. */
4482 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
1da177e4 4483
8f27ebb9
YH		 4484 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
4485 age >= ifp->valid_lft) {
1da177e4
LT		 4486 spin_unlock(&ifp->lock);
4487 in6_ifa_hold(ifp);
aa8caa76 4488 rcu_read_unlock_bh();
1da177e4 4489 ipv6_del_addr(ifp);
aa8caa76 4490 rcu_read_lock_bh();
1da177e4 4491 goto restart;
8f27ebb9
YH		 4492 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
4493 spin_unlock(&ifp->lock);
4494 continue;
1da177e4 4495 } else if (age >= ifp->prefered_lft) {
a1ed0526 4496 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
1da177e4
LT		 4497 int deprecate = 0;
4498
4499 if (!(ifp->flags&IFA_F_DEPRECATED)) {
4500 deprecate = 1;
4501 ifp->flags |= IFA_F_DEPRECATED;
4502 }
4503
fad8da3e
YA		 4504 if ((ifp->valid_lft != INFINITY_LIFE_TIME) &&
4505 (time_before(ifp->tstamp + ifp->valid_lft * HZ, next)))
1da177e4
LT		 4506 next = ifp->tstamp + ifp->valid_lft * HZ;
4507
4508 spin_unlock(&ifp->lock);
4509
4510 if (deprecate) {
4511 in6_ifa_hold(ifp);
1da177e4
LT		 4512
4513 ipv6_ifa_notify(0, ifp);
4514 in6_ifa_put(ifp);
4515 goto restart;
4516 }
1da177e4
LT		 4517 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
4518 !(ifp->flags&IFA_F_TENTATIVE)) {
88949cf4 4519 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
4520 ifp->idev->cnf.dad_transmits *
19e16d22 4521 max(NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME), HZ/100) / HZ;
88949cf4 4522
1da177e4
LT		 4523 if (age >= ifp->prefered_lft - regen_advance) {
4524 struct inet6_ifaddr *ifpub = ifp->ifpub;
4525 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
4526 next = ifp->tstamp + ifp->prefered_lft * HZ;
4527 if (!ifp->regen_count && ifpub) {
4528 ifp->regen_count++;
4529 in6_ifa_hold(ifp);
4530 in6_ifa_hold(ifpub);
4531 spin_unlock(&ifp->lock);
5c578aed 4532
291d809b
HY		 4533 spin_lock(&ifpub->lock);
4534 ifpub->regen_count = 0;
4535 spin_unlock(&ifpub->lock);
e64e469b 4536 rcu_read_unlock_bh();
969c5464 4537 ipv6_create_tempaddr(ifpub, true);
1da177e4
LT		 4538 in6_ifa_put(ifpub);
4539 in6_ifa_put(ifp);
e64e469b 4540 rcu_read_lock_bh();
1da177e4
LT		 4541 goto restart;
4542 }
4543 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
4544 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
4545 spin_unlock(&ifp->lock);
1da177e4
LT		 4546 } else {
4547 /* ifp->prefered_lft <= ifp->valid_lft */
4548 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
4549 next = ifp->tstamp + ifp->prefered_lft * HZ;
4550 spin_unlock(&ifp->lock);
4551 }
4552 }
1da177e4
LT		 4553 }
4554
b2db7564
YH		 4555 next_sec = round_jiffies_up(next);
4556 next_sched = next;
4557
4558 /* If rounded timeout is accurate enough, accept it. */
4559 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
4560 next_sched = next_sec;
4561
4562 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
4563 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
4564 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
4565
e32ac250
JP		 4566 pr_debug("now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
4567 now, next, next_sec, next_sched);
c15b1cca 4568 mod_delayed_work(addrconf_wq, &addr_chk_work, next_sched - now);
5c578aed 4569 rcu_read_unlock_bh();
1da177e4
LT		 4570}
4571
c15b1cca
HFS		 4572static void addrconf_verify_work(struct work_struct *w)
4573{
4574 rtnl_lock();
4575 addrconf_verify_rtnl();
4576 rtnl_unlock();
4577}
4578
4579static void addrconf_verify(void)
4580{
4581 mod_delayed_work(addrconf_wq, &addr_chk_work, 0);
4582}
4583
caeaba79
ND		 4584static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local,
4585 struct in6_addr **peer_pfx)
461d8837
TG		 4586{
4587 struct in6_addr *pfx = NULL;
4588
caeaba79
ND		 4589 *peer_pfx = NULL;
4590
461d8837
TG		 4591 if (addr)
4592 pfx = nla_data(addr);
4593
4594 if (local) {
4595 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
caeaba79
ND		 4596 *peer_pfx = pfx;
4597 pfx = nla_data(local);
461d8837
TG		 4598 }
4599
4600 return pfx;
4601}
4602
ef7c79ed 4603static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
461d8837
TG		 4604 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
4605 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
4606 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
479840ff 4607 [IFA_FLAGS] = { .len = sizeof(u32) },
8308f3ff 4608 [IFA_RT_PRIORITY] = { .len = sizeof(u32) },
6ecf4c37 4609 [IFA_TARGET_NETNSID] = { .type = NLA_S32 },
461d8837
TG		 4610};
4611
1da177e4 4612static int
c21ef3e3
DA		 4613inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh,
4614 struct netlink_ext_ack *extack)
1da177e4 4615{
3b1e0a65 4616 struct net *net = sock_net(skb->sk);
b933f716
TG		 4617 struct ifaddrmsg *ifm;
4618 struct nlattr *tb[IFA_MAX+1];
caeaba79 4619 struct in6_addr *pfx, *peer_pfx;
6046d5b4 4620 u32 ifa_flags;
b933f716 4621 int err;
1da177e4 4622
8cb08174
JB		 4623 err = nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX,
4624 ifa_ipv6_policy, extack);
b933f716
TG		 4625 if (err < 0)
4626 return err;
4627
4628 ifm = nlmsg_data(nlh);
caeaba79 4629 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
63159f29 4630 if (!pfx)
1da177e4
LT		 4631 return -EINVAL;
4632
6046d5b4
HK		 4633 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
4634
4635 /* We ignore other flags so far. */
4636 ifa_flags &= IFA_F_MANAGETEMPADDR;
4637
4638 return inet6_addr_del(net, ifm->ifa_index, ifa_flags, pfx,
4639 ifm->ifa_prefixlen);
1da177e4
LT		 4640}
4641
8308f3ff 4642static int modify_prefix_route(struct inet6_ifaddr *ifp,
61794012
HL		 4643 unsigned long expires, u32 flags,
4644 bool modify_peer)
8308f3ff
DA		 4645{
4646 struct fib6_info *f6i;
e7c7faa9 4647 u32 prio;
8308f3ff 4648
61794012
HL		 4649 f6i = addrconf_get_prefix_route(modify_peer ? &ifp->peer_addr : &ifp->addr,
4650 ifp->prefix_len,
2b2450ca 4651 ifp->idev->dev, 0, RTF_DEFAULT, true);
8308f3ff
DA		 4652 if (!f6i)
4653 return -ENOENT;
4654
e7c7faa9
DA		 4655 prio = ifp->rt_priority ? : IP6_RT_PRIO_ADDRCONF;
4656 if (f6i->fib6_metric != prio) {
4657 /* delete old one */
11dd74b3 4658 ip6_del_rt(dev_net(ifp->idev->dev), f6i, false);
e7c7faa9 4659
8308f3ff 4660 /* add new one */
61794012
HL		 4661 addrconf_prefix_route(modify_peer ? &ifp->peer_addr : &ifp->addr,
4662 ifp->prefix_len,
8308f3ff
DA		 4663 ifp->rt_priority, ifp->idev->dev,
4664 expires, flags, GFP_KERNEL);
8308f3ff
DA		 4665 } else {
4666 if (!expires)
4667 fib6_clean_expires(f6i);
4668 else
4669 fib6_set_expires(f6i, expires);
4670
4671 fib6_info_release(f6i);
4672 }
4673
4674 return 0;
4675}
4676
d169a1f8 4677static int inet6_addr_modify(struct inet6_ifaddr *ifp, struct ifa6_config *cfg)
081bba5b 4678{
6f704992
YH		 4679 u32 flags;
4680 clock_t expires;
4bed72e4 4681 unsigned long timeout;
53bd6749 4682 bool was_managetempaddr;
5b84efec 4683 bool had_prefixroute;
d0098e4c 4684 bool new_peer = false;
46d48046 4685
c15b1cca
HFS		 4686 ASSERT_RTNL();
4687
d169a1f8 4688 if (!cfg->valid_lft || cfg->preferred_lft > cfg->valid_lft)
081bba5b
NT		 4689 return -EINVAL;
4690
d169a1f8 4691 if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR &&
53bd6749
JP		 4692 (ifp->flags & IFA_F_TEMPORARY || ifp->prefix_len != 64))
4693 return -EINVAL;
4694
f1c02cfb 4695 if (!(ifp->flags & IFA_F_TENTATIVE) || ifp->flags & IFA_F_DADFAILED)
d169a1f8 4696 cfg->ifa_flags &= ~IFA_F_OPTIMISTIC;
f1c02cfb 4697
d169a1f8 4698 timeout = addrconf_timeout_fixup(cfg->valid_lft, HZ);
4bed72e4
YH		 4699 if (addrconf_finite_timeout(timeout)) {
4700 expires = jiffies_to_clock_t(timeout * HZ);
d169a1f8 4701 cfg->valid_lft = timeout;
6f704992 4702 flags = RTF_EXPIRES;
4bed72e4
YH		 4703 } else {
4704 expires = 0;
4705 flags = 0;
d169a1f8 4706 cfg->ifa_flags |= IFA_F_PERMANENT;
6f704992 4707 }
081bba5b 4708
d169a1f8 4709 timeout = addrconf_timeout_fixup(cfg->preferred_lft, HZ);
4bed72e4
YH		 4710 if (addrconf_finite_timeout(timeout)) {
4711 if (timeout == 0)
d169a1f8
DA		 4712 cfg->ifa_flags |= IFA_F_DEPRECATED;
4713 cfg->preferred_lft = timeout;
4bed72e4 4714 }
081bba5b 4715
d0098e4c
HL		 4716 if (cfg->peer_pfx &&
4717 memcmp(&ifp->peer_addr, cfg->peer_pfx, sizeof(struct in6_addr))) {
4718 if (!ipv6_addr_any(&ifp->peer_addr))
4719 cleanup_prefix_route(ifp, expires, true, true);
4720 new_peer = true;
4721 }
4722
081bba5b 4723 spin_lock_bh(&ifp->lock);
53bd6749 4724 was_managetempaddr = ifp->flags & IFA_F_MANAGETEMPADDR;
5b84efec
TH		 4725 had_prefixroute = ifp->flags & IFA_F_PERMANENT &&
4726 !(ifp->flags & IFA_F_NOPREFIXROUTE);
53bd6749 4727 ifp->flags &= ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD |
761aac73
TH		 4728 IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
4729 IFA_F_NOPREFIXROUTE);
d169a1f8 4730 ifp->flags |= cfg->ifa_flags;
081bba5b 4731 ifp->tstamp = jiffies;
d169a1f8
DA		 4732 ifp->valid_lft = cfg->valid_lft;
4733 ifp->prefered_lft = cfg->preferred_lft;
081bba5b 4734
8308f3ff
DA		 4735 if (cfg->rt_priority && cfg->rt_priority != ifp->rt_priority)
4736 ifp->rt_priority = cfg->rt_priority;
081bba5b 4737
d0098e4c
HL		 4738 if (new_peer)
4739 ifp->peer_addr = *cfg->peer_pfx;
4740
081bba5b
NT		 4741 spin_unlock_bh(&ifp->lock);
4742 if (!(ifp->flags&IFA_F_TENTATIVE))
4743 ipv6_ifa_notify(0, ifp);
081bba5b 4744
d169a1f8 4745 if (!(cfg->ifa_flags & IFA_F_NOPREFIXROUTE)) {
8308f3ff
DA		 4746 int rc = -ENOENT;
4747
4748 if (had_prefixroute)
61794012 4749 rc = modify_prefix_route(ifp, expires, flags, false);
8308f3ff
DA		 4750
4751 /* prefix route could have been deleted; if so restore it */
4752 if (rc == -ENOENT) {
4753 addrconf_prefix_route(&ifp->addr, ifp->prefix_len,
4754 ifp->rt_priority, ifp->idev->dev,
4755 expires, flags, GFP_KERNEL);
4756 }
61794012
HL		 4757
4758 if (had_prefixroute && !ipv6_addr_any(&ifp->peer_addr))
4759 rc = modify_prefix_route(ifp, expires, flags, true);
4760
4761 if (rc == -ENOENT && !ipv6_addr_any(&ifp->peer_addr)) {
4762 addrconf_prefix_route(&ifp->peer_addr, ifp->prefix_len,
4763 ifp->rt_priority, ifp->idev->dev,
4764 expires, flags, GFP_KERNEL);
4765 }
5b84efec
TH		 4766 } else if (had_prefixroute) {
4767 enum cleanup_prefix_rt_t action;
4768 unsigned long rt_expires;
4769
4770 write_lock_bh(&ifp->idev->lock);
4771 action = check_cleanup_prefix_route(ifp, &rt_expires);
4772 write_unlock_bh(&ifp->idev->lock);
4773
4774 if (action != CLEANUP_PREFIX_RT_NOP) {
4775 cleanup_prefix_route(ifp, rt_expires,
d0098e4c 4776 action == CLEANUP_PREFIX_RT_DEL, false);
5b84efec 4777 }
761aac73 4778 }
53bd6749
JP		 4779
4780 if (was_managetempaddr || ifp->flags & IFA_F_MANAGETEMPADDR) {
d169a1f8
DA		 4781 if (was_managetempaddr &&
4782 !(ifp->flags & IFA_F_MANAGETEMPADDR)) {
4783 cfg->valid_lft = 0;
4784 cfg->preferred_lft = 0;
4785 }
4786 manage_tempaddrs(ifp->idev, ifp, cfg->valid_lft,
4787 cfg->preferred_lft, !was_managetempaddr,
4788 jiffies);
53bd6749
JP		 4789 }
4790
c15b1cca 4791 addrconf_verify_rtnl();
081bba5b
NT		 4792
4793 return 0;
4794}
4795
1da177e4 4796static int
c21ef3e3
DA		 4797inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh,
4798 struct netlink_ext_ack *extack)
1da177e4 4799{
3b1e0a65 4800 struct net *net = sock_net(skb->sk);
461d8837
TG		 4801 struct ifaddrmsg *ifm;
4802 struct nlattr *tb[IFA_MAX+1];
19b1518c 4803 struct in6_addr *peer_pfx;
7198f8ce
TG		 4804 struct inet6_ifaddr *ifa;
4805 struct net_device *dev;
f1c02cfb 4806 struct inet6_dev *idev;
19b1518c 4807 struct ifa6_config cfg;
461d8837 4808 int err;
1da177e4 4809
8cb08174
JB		 4810 err = nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX,
4811 ifa_ipv6_policy, extack);
461d8837
TG		 4812 if (err < 0)
4813 return err;
4814
19b1518c
DA		 4815 memset(&cfg, 0, sizeof(cfg));
4816
461d8837 4817 ifm = nlmsg_data(nlh);
19b1518c
DA		 4818 cfg.pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
4819 if (!cfg.pfx)
1da177e4
LT		 4820 return -EINVAL;
4821
19b1518c
DA		 4822 cfg.peer_pfx = peer_pfx;
4823 cfg.plen = ifm->ifa_prefixlen;
8308f3ff
DA		 4824 if (tb[IFA_RT_PRIORITY])
4825 cfg.rt_priority = nla_get_u32(tb[IFA_RT_PRIORITY]);
4826
19b1518c
DA		 4827 cfg.valid_lft = INFINITY_LIFE_TIME;
4828 cfg.preferred_lft = INFINITY_LIFE_TIME;
4829
461d8837 4830 if (tb[IFA_CACHEINFO]) {
0778769d 4831 struct ifa_cacheinfo *ci;
461d8837
TG		 4832
4833 ci = nla_data(tb[IFA_CACHEINFO]);
19b1518c
DA		 4834 cfg.valid_lft = ci->ifa_valid;
4835 cfg.preferred_lft = ci->ifa_prefered;
0778769d
NT		 4836 }
4837
af284937 4838 dev = __dev_get_by_index(net, ifm->ifa_index);
63159f29 4839 if (!dev)
7198f8ce
TG		 4840 return -ENODEV;
4841
19b1518c
DA		 4842 if (tb[IFA_FLAGS])
4843 cfg.ifa_flags = nla_get_u32(tb[IFA_FLAGS]);
4844 else
4845 cfg.ifa_flags = ifm->ifa_flags;
479840ff 4846
55ebaef1 4847 /* We ignore other flags so far. */
19b1518c
DA		 4848 cfg.ifa_flags &= IFA_F_NODAD | IFA_F_HOMEADDRESS |
4849 IFA_F_MANAGETEMPADDR | IFA_F_NOPREFIXROUTE |
4850 IFA_F_MCAUTOJOIN | IFA_F_OPTIMISTIC;
f1c02cfb
SD		 4851
4852 idev = ipv6_find_idev(dev);
db0b99f5
SD		 4853 if (IS_ERR(idev))
4854 return PTR_ERR(idev);
f1c02cfb
SD		 4855
4856 if (!ipv6_allow_optimistic_dad(net, idev))
19b1518c 4857 cfg.ifa_flags &= ~IFA_F_OPTIMISTIC;
f1c02cfb 4858
19b1518c
DA		 4859 if (cfg.ifa_flags & IFA_F_NODAD &&
4860 cfg.ifa_flags & IFA_F_OPTIMISTIC) {
f1c02cfb
SD		 4861 NL_SET_ERR_MSG(extack, "IFA_F_NODAD and IFA_F_OPTIMISTIC are mutually exclusive");
4862 return -EINVAL;
4863 }
55ebaef1 4864
19b1518c 4865 ifa = ipv6_get_ifaddr(net, cfg.pfx, dev, 1);
63159f29 4866 if (!ifa) {
7198f8ce
TG		 4867 /*
4868 * It would be best to check for !NLM_F_CREATE here but
db9c7c39 4869 * userspace already relies on not having to provide this.
7198f8ce 4870 */
19b1518c 4871 return inet6_addr_add(net, ifm->ifa_index, &cfg, extack);
081bba5b
NT		 4872 }
4873
7198f8ce
TG		 4874 if (nlh->nlmsg_flags & NLM_F_EXCL ||
4875 !(nlh->nlmsg_flags & NLM_F_REPLACE))
4876 err = -EEXIST;
4877 else
d169a1f8 4878 err = inet6_addr_modify(ifa, &cfg);
7198f8ce
TG		 4879
4880 in6_ifa_put(ifa);
4881
4882 return err;
1da177e4
LT		 4883}
4884
479840ff 4885static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u32 flags,
101bb229
TG		 4886 u8 scope, int ifindex)
4887{
4888 struct ifaddrmsg *ifm;
4889
4890 ifm = nlmsg_data(nlh);
4891 ifm->ifa_family = AF_INET6;
4892 ifm->ifa_prefixlen = prefixlen;
4893 ifm->ifa_flags = flags;
4894 ifm->ifa_scope = scope;
4895 ifm->ifa_index = ifindex;
4896}
4897
85486af0
TG		 4898static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
4899 unsigned long tstamp, u32 preferred, u32 valid)
4900{
4901 struct ifa_cacheinfo ci;
4902
18a31e1e
TG		 4903 ci.cstamp = cstamp_delta(cstamp);
4904 ci.tstamp = cstamp_delta(tstamp);
85486af0
TG		 4905 ci.ifa_prefered = preferred;
4906 ci.ifa_valid = valid;
4907
4908 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
4909}
4910
101bb229
TG		 4911static inline int rt_scope(int ifa_scope)
4912{
4913 if (ifa_scope & IFA_HOST)
4914 return RT_SCOPE_HOST;
4915 else if (ifa_scope & IFA_LINK)
4916 return RT_SCOPE_LINK;
4917 else if (ifa_scope & IFA_SITE)
4918 return RT_SCOPE_SITE;
4919 else
4920 return RT_SCOPE_UNIVERSE;
4921}
4922
0ab6803b
TG		 4923static inline int inet6_ifaddr_msgsize(void)
4924{
339bf98f 4925 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
caeaba79 4926 + nla_total_size(16) /* IFA_LOCAL */
339bf98f 4927 + nla_total_size(16) /* IFA_ADDRESS */
479840ff 4928 + nla_total_size(sizeof(struct ifa_cacheinfo))
8308f3ff
DA		 4929 + nla_total_size(4) /* IFA_FLAGS */
4930 + nla_total_size(4) /* IFA_RT_PRIORITY */;
0ab6803b 4931}
c5396a31 4932
6ba1e6e8
DA		 4933enum addr_type_t {
4934 UNICAST_ADDR,
4935 MULTICAST_ADDR,
4936 ANYCAST_ADDR,
4937};
4938
203651b6
CB		 4939struct inet6_fill_args {
4940 u32 portid;
4941 u32 seq;
4942 int event;
4943 unsigned int flags;
4944 int netnsid;
6371a71f 4945 int ifindex;
6ba1e6e8 4946 enum addr_type_t type;
203651b6
CB		 4947};
4948
1da177e4 4949static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
203651b6 4950 struct inet6_fill_args *args)
1da177e4 4951{
1da177e4 4952 struct nlmsghdr *nlh;
85486af0 4953 u32 preferred, valid;
1da177e4 4954
203651b6
CB		 4955 nlh = nlmsg_put(skb, args->portid, args->seq, args->event,
4956 sizeof(struct ifaddrmsg), args->flags);
63159f29 4957 if (!nlh)
26932566 4958 return -EMSGSIZE;
0ab6803b 4959
101bb229
TG		 4960 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
4961 ifa->idev->dev->ifindex);
4962
203651b6
CB		 4963 if (args->netnsid >= 0 &&
4964 nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid))
6ecf4c37
CB		 4965 goto error;
4966
fad8da3e
YA		 4967 if (!((ifa->flags&IFA_F_PERMANENT) &&
4968 (ifa->prefered_lft == INFINITY_LIFE_TIME))) {
85486af0
TG		 4969 preferred = ifa->prefered_lft;
4970 valid = ifa->valid_lft;
4971 if (preferred != INFINITY_LIFE_TIME) {
1da177e4 4972 long tval = (jiffies - ifa->tstamp)/HZ;
a1faa698
JR		 4973 if (preferred > tval)
4974 preferred -= tval;
4975 else
4976 preferred = 0;
f56619fc
BH		 4977 if (valid != INFINITY_LIFE_TIME) {
4978 if (valid > tval)
4979 valid -= tval;
4980 else
4981 valid = 0;
4982 }
1da177e4
LT		 4983 }
4984 } else {
85486af0
TG		 4985 preferred = INFINITY_LIFE_TIME;
4986 valid = INFINITY_LIFE_TIME;
4987 }
4988
7996c799 4989 if (!ipv6_addr_any(&ifa->peer_addr)) {
930345ea
JB		 4990 if (nla_put_in6_addr(skb, IFA_LOCAL, &ifa->addr) < 0 ||
4991 nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->peer_addr) < 0)
caeaba79
ND		 4992 goto error;
4993 } else
930345ea 4994 if (nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->addr) < 0)
caeaba79
ND		 4995 goto error;
4996
8308f3ff
DA		 4997 if (ifa->rt_priority &&
4998 nla_put_u32(skb, IFA_RT_PRIORITY, ifa->rt_priority))
4999 goto error;
5000
caeaba79
ND		 5001 if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0)
5002 goto error;
1da177e4 5003
479840ff
JP		 5004 if (nla_put_u32(skb, IFA_FLAGS, ifa->flags) < 0)
5005 goto error;
5006
053c095a
JB		 5007 nlmsg_end(skb, nlh);
5008 return 0;
caeaba79
ND		 5009
5010error:
5011 nlmsg_cancel(skb, nlh);
5012 return -EMSGSIZE;
1da177e4
LT		 5013}
5014
5015static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
203651b6 5016 struct inet6_fill_args *args)
1da177e4 5017{
1da177e4 5018 struct nlmsghdr *nlh;
101bb229
TG		 5019 u8 scope = RT_SCOPE_UNIVERSE;
5020 int ifindex = ifmca->idev->dev->ifindex;
5021
5022 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
5023 scope = RT_SCOPE_SITE;
1da177e4 5024
203651b6
CB		 5025 nlh = nlmsg_put(skb, args->portid, args->seq, args->event,
5026 sizeof(struct ifaddrmsg), args->flags);
63159f29 5027 if (!nlh)
26932566 5028 return -EMSGSIZE;
85486af0 5029
203651b6 5030 if (args->netnsid >= 0 &&
ceb736e1
ZQ		 5031 nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid)) {
5032 nlmsg_cancel(skb, nlh);
6ecf4c37 5033 return -EMSGSIZE;
ceb736e1 5034 }
6ecf4c37 5035
0ab6803b 5036 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
930345ea 5037 if (nla_put_in6_addr(skb, IFA_MULTICAST, &ifmca->mca_addr) < 0 ||
0ab6803b 5038 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
26932566
PM		 5039 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
5040 nlmsg_cancel(skb, nlh);
5041 return -EMSGSIZE;
5042 }
85486af0 5043
053c095a
JB		 5044 nlmsg_end(skb, nlh);
5045 return 0;
1da177e4
LT		 5046}
5047
5048static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
203651b6 5049 struct inet6_fill_args *args)
1da177e4 5050{
9ee8cbb2
DA		 5051 struct net_device *dev = fib6_info_nh_dev(ifaca->aca_rt);
5052 int ifindex = dev ? dev->ifindex : 1;
1da177e4 5053 struct nlmsghdr *nlh;
101bb229 5054 u8 scope = RT_SCOPE_UNIVERSE;
101bb229
TG		 5055
5056 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
5057 scope = RT_SCOPE_SITE;
1da177e4 5058
203651b6
CB		 5059 nlh = nlmsg_put(skb, args->portid, args->seq, args->event,
5060 sizeof(struct ifaddrmsg), args->flags);
63159f29 5061 if (!nlh)
26932566 5062 return -EMSGSIZE;
85486af0 5063
203651b6 5064 if (args->netnsid >= 0 &&
ceb736e1
ZQ		 5065 nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid)) {
5066 nlmsg_cancel(skb, nlh);
6ecf4c37 5067 return -EMSGSIZE;
ceb736e1 5068 }
6ecf4c37 5069
0ab6803b 5070 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
930345ea 5071 if (nla_put_in6_addr(skb, IFA_ANYCAST, &ifaca->aca_addr) < 0 ||
0ab6803b 5072 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
26932566
PM		 5073 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
5074 nlmsg_cancel(skb, nlh);
5075 return -EMSGSIZE;
5076 }
1da177e4 5077
053c095a
JB		 5078 nlmsg_end(skb, nlh);
5079 return 0;
1da177e4
LT		 5080}
5081
234b27c3
ED		 5082/* called with rcu_read_lock() */
5083static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
fe884c2b 5084 struct netlink_callback *cb, int s_ip_idx,
6ba1e6e8 5085 struct inet6_fill_args *fillargs)
234b27c3 5086{
234b27c3
ED		 5087 struct ifmcaddr6 *ifmca;
5088 struct ifacaddr6 *ifaca;
fe884c2b 5089 int ip_idx = 0;
234b27c3 5090 int err = 1;
234b27c3
ED		 5091
5092 read_lock_bh(&idev->lock);
6ba1e6e8 5093 switch (fillargs->type) {
502a2ffd 5094 case UNICAST_ADDR: {
5095 struct inet6_ifaddr *ifa;
6ba1e6e8 5096 fillargs->event = RTM_NEWADDR;
502a2ffd 5097
234b27c3 5098 /* unicast address incl. temp addr */
502a2ffd 5099 list_for_each_entry(ifa, &idev->addr_list, if_list) {
4ba4c566
DA		 5100 if (ip_idx < s_ip_idx)
5101 goto next;
6ba1e6e8 5102 err = inet6_fill_ifaddr(skb, ifa, fillargs);
053c095a 5103 if (err < 0)
234b27c3 5104 break;
63998ac2 5105 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
4ba4c566
DA		 5106next:
5107 ip_idx++;
234b27c3
ED		 5108 }
5109 break;
502a2ffd 5110 }
234b27c3 5111 case MULTICAST_ADDR:
88e2ca30 5112 read_unlock_bh(&idev->lock);
6ba1e6e8 5113 fillargs->event = RTM_GETMULTICAST;
203651b6 5114
234b27c3 5115 /* multicast address */
88e2ca30
TY		 5116 for (ifmca = rcu_dereference(idev->mc_list);
5117 ifmca;
5118 ifmca = rcu_dereference(ifmca->next), ip_idx++) {
234b27c3
ED		 5119 if (ip_idx < s_ip_idx)
5120 continue;
6ba1e6e8 5121 err = inet6_fill_ifmcaddr(skb, ifmca, fillargs);
053c095a 5122 if (err < 0)
234b27c3
ED		 5123 break;
5124 }
88e2ca30 5125 read_lock_bh(&idev->lock);
234b27c3
ED		 5126 break;
5127 case ANYCAST_ADDR:
6ba1e6e8 5128 fillargs->event = RTM_GETANYCAST;
234b27c3
ED		 5129 /* anycast address */
5130 for (ifaca = idev->ac_list; ifaca;
5131 ifaca = ifaca->aca_next, ip_idx++) {
5132 if (ip_idx < s_ip_idx)
5133 continue;
6ba1e6e8 5134 err = inet6_fill_ifacaddr(skb, ifaca, fillargs);
053c095a 5135 if (err < 0)
234b27c3
ED		 5136 break;
5137 }
5138 break;
5139 default:
5140 break;
5141 }
5142 read_unlock_bh(&idev->lock);
fe884c2b 5143 cb->args[2] = ip_idx;
234b27c3
ED		 5144 return err;
5145}
5146
ed6eff11
DA		 5147static int inet6_valid_dump_ifaddr_req(const struct nlmsghdr *nlh,
5148 struct inet6_fill_args *fillargs,
5149 struct net **tgt_net, struct sock *sk,
6371a71f 5150 struct netlink_callback *cb)
ed6eff11 5151{
6371a71f 5152 struct netlink_ext_ack *extack = cb->extack;
ed6eff11
DA		 5153 struct nlattr *tb[IFA_MAX+1];
5154 struct ifaddrmsg *ifm;
5155 int err, i;
5156
5157 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) {
5158 NL_SET_ERR_MSG_MOD(extack, "Invalid header for address dump request");
5159 return -EINVAL;
5160 }
5161
5162 ifm = nlmsg_data(nlh);
5163 if (ifm->ifa_prefixlen || ifm->ifa_flags || ifm->ifa_scope) {
5164 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for address dump request");
5165 return -EINVAL;
5166 }
6371a71f
DA		 5167
5168 fillargs->ifindex = ifm->ifa_index;
5169 if (fillargs->ifindex) {
5170 cb->answer_flags |= NLM_F_DUMP_FILTERED;
5171 fillargs->flags |= NLM_F_DUMP_FILTERED;
ed6eff11
DA		 5172 }
5173
8cb08174
JB		 5174 err = nlmsg_parse_deprecated_strict(nlh, sizeof(*ifm), tb, IFA_MAX,
5175 ifa_ipv6_policy, extack);
ed6eff11
DA		 5176 if (err < 0)
5177 return err;
5178
5179 for (i = 0; i <= IFA_MAX; ++i) {
5180 if (!tb[i])
5181 continue;
5182
5183 if (i == IFA_TARGET_NETNSID) {
5184 struct net *net;
5185
5186 fillargs->netnsid = nla_get_s32(tb[i]);
5187 net = rtnl_get_net_ns_capable(sk, fillargs->netnsid);
5188 if (IS_ERR(net)) {
bf4cc40e 5189 fillargs->netnsid = -1;
ed6eff11
DA		 5190 NL_SET_ERR_MSG_MOD(extack, "Invalid target network namespace id");
5191 return PTR_ERR(net);
5192 }
5193 *tgt_net = net;
5194 } else {
5195 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in dump request");
5196 return -EINVAL;
5197 }
5198 }
5199
5200 return 0;
5201}
5202
1da177e4
LT		 5203static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
5204 enum addr_type_t type)
5205{
ed6eff11 5206 const struct nlmsghdr *nlh = cb->nlh;
6ba1e6e8
DA		 5207 struct inet6_fill_args fillargs = {
5208 .portid = NETLINK_CB(cb->skb).portid,
5209 .seq = cb->nlh->nlmsg_seq,
5210 .flags = NLM_F_MULTI,
5211 .netnsid = -1,
5212 .type = type,
5213 };
234b27c3 5214 struct net *net = sock_net(skb->sk);
6ecf4c37 5215 struct net *tgt_net = net;
fe884c2b 5216 int idx, s_idx, s_ip_idx;
234b27c3 5217 int h, s_h;
1da177e4 5218 struct net_device *dev;
234b27c3
ED		 5219 struct inet6_dev *idev;
5220 struct hlist_head *head;
242afaa6 5221 int err = 0;
1ab1457c 5222
234b27c3
ED		 5223 s_h = cb->args[0];
5224 s_idx = idx = cb->args[1];
fe884c2b 5225 s_ip_idx = cb->args[2];
5d5619b4 5226
ed6eff11 5227 if (cb->strict_check) {
ed6eff11 5228 err = inet6_valid_dump_ifaddr_req(nlh, &fillargs, &tgt_net,
6371a71f 5229 skb->sk, cb);
ed6eff11 5230 if (err < 0)
242afaa6 5231 goto put_tgt_net;
6371a71f 5232
242afaa6 5233 err = 0;
6371a71f
DA		 5234 if (fillargs.ifindex) {
5235 dev = __dev_get_by_index(tgt_net, fillargs.ifindex);
242afaa6
DA		 5236 if (!dev) {
5237 err = -ENODEV;
5238 goto put_tgt_net;
5239 }
6371a71f
DA		 5240 idev = __in6_dev_get(dev);
5241 if (idev) {
5242 err = in6_dump_addrs(idev, skb, cb, s_ip_idx,
5243 &fillargs);
1518039f
JK		 5244 if (err > 0)
5245 err = 0;
6371a71f
DA		 5246 }
5247 goto put_tgt_net;
5248 }
6ecf4c37
CB		 5249 }
5250
234b27c3 5251 rcu_read_lock();
6ecf4c37 5252 cb->seq = atomic_read(&tgt_net->ipv6.dev_addr_genid) ^ tgt_net->dev_base_seq;
234b27c3
ED		 5253 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
5254 idx = 0;
6ecf4c37 5255 head = &tgt_net->dev_index_head[h];
b67bfe0d 5256 hlist_for_each_entry_rcu(dev, head, index_hlist) {
234b27c3
ED		 5257 if (idx < s_idx)
5258 goto cont;
4b97efdf 5259 if (h > s_h || idx > s_idx)
234b27c3 5260 s_ip_idx = 0;
e21e8467
SH		 5261 idev = __in6_dev_get(dev);
5262 if (!idev)
234b27c3
ED		 5263 goto cont;
5264
fe884c2b 5265 if (in6_dump_addrs(idev, skb, cb, s_ip_idx,
6ba1e6e8 5266 &fillargs) < 0)
234b27c3 5267 goto done;
7562f876 5268cont:
234b27c3
ED		 5269 idx++;
5270 }
1da177e4 5271 }
234b27c3
ED		 5272done:
5273 rcu_read_unlock();
5274 cb->args[0] = h;
5275 cb->args[1] = idx;
6371a71f 5276put_tgt_net:
6ba1e6e8 5277 if (fillargs.netnsid >= 0)
6ecf4c37 5278 put_net(tgt_net);
234b27c3 5279
7c1e8a38 5280 return skb->len ? : err;
1da177e4
LT		 5281}
5282
5283static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
5284{
5285 enum addr_type_t type = UNICAST_ADDR;
b854272b 5286
1da177e4
LT		 5287 return inet6_dump_addr(skb, cb, type);
5288}
5289
5290static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
5291{
5292 enum addr_type_t type = MULTICAST_ADDR;
b854272b 5293
1da177e4
LT		 5294 return inet6_dump_addr(skb, cb, type);
5295}
5296
5297
5298static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
5299{
5300 enum addr_type_t type = ANYCAST_ADDR;
b854272b 5301
1da177e4
LT		 5302 return inet6_dump_addr(skb, cb, type);
5303}
5304
4b1373de
JK		 5305static int inet6_rtm_valid_getaddr_req(struct sk_buff *skb,
5306 const struct nlmsghdr *nlh,
5307 struct nlattr **tb,
5308 struct netlink_ext_ack *extack)
5309{
5310 struct ifaddrmsg *ifm;
5311 int i, err;
5312
5313 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) {
5314 NL_SET_ERR_MSG_MOD(extack, "Invalid header for get address request");
5315 return -EINVAL;
5316 }
5317
2beb6d29
HL		 5318 if (!netlink_strict_get_check(skb))
5319 return nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX,
5320 ifa_ipv6_policy, extack);
5321
4b1373de
JK		 5322 ifm = nlmsg_data(nlh);
5323 if (ifm->ifa_prefixlen || ifm->ifa_flags || ifm->ifa_scope) {
5324 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for get address request");
5325 return -EINVAL;
5326 }
5327
8cb08174
JB		 5328 err = nlmsg_parse_deprecated_strict(nlh, sizeof(*ifm), tb, IFA_MAX,
5329 ifa_ipv6_policy, extack);
4b1373de
JK		 5330 if (err)
5331 return err;
5332
5333 for (i = 0; i <= IFA_MAX; i++) {
5334 if (!tb[i])
5335 continue;
5336
5337 switch (i) {
5338 case IFA_TARGET_NETNSID:
5339 case IFA_ADDRESS:
5340 case IFA_LOCAL:
5341 break;
5342 default:
5343 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in get address request");
5344 return -EINVAL;
5345 }
5346 }
5347
5348 return 0;
5349}
5350
c21ef3e3
DA		 5351static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh,
5352 struct netlink_ext_ack *extack)
6c223828 5353{
3b1e0a65 5354 struct net *net = sock_net(in_skb->sk);
203651b6
CB		 5355 struct inet6_fill_args fillargs = {
5356 .portid = NETLINK_CB(in_skb).portid,
5357 .seq = nlh->nlmsg_seq,
5358 .event = RTM_NEWADDR,
5359 .flags = 0,
5360 .netnsid = -1,
5361 };
6ecf4c37 5362 struct net *tgt_net = net;
1b29fc2c
TG		 5363 struct ifaddrmsg *ifm;
5364 struct nlattr *tb[IFA_MAX+1];
caeaba79 5365 struct in6_addr *addr = NULL, *peer;
6c223828
NT		 5366 struct net_device *dev = NULL;
5367 struct inet6_ifaddr *ifa;
5368 struct sk_buff *skb;
6c223828
NT		 5369 int err;
5370
4b1373de 5371 err = inet6_rtm_valid_getaddr_req(in_skb, nlh, tb, extack);
1b29fc2c 5372 if (err < 0)
c24675f8 5373 return err;
1b29fc2c 5374
6ecf4c37 5375 if (tb[IFA_TARGET_NETNSID]) {
203651b6 5376 fillargs.netnsid = nla_get_s32(tb[IFA_TARGET_NETNSID]);
6ecf4c37
CB		 5377
5378 tgt_net = rtnl_get_net_ns_capable(NETLINK_CB(in_skb).sk,
203651b6 5379 fillargs.netnsid);
6ecf4c37
CB		 5380 if (IS_ERR(tgt_net))
5381 return PTR_ERR(tgt_net);
5382 }
5383
caeaba79 5384 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer);
c24675f8
FW		 5385 if (!addr)
5386 return -EINVAL;
6c223828 5387
1b29fc2c 5388 ifm = nlmsg_data(nlh);
6c223828 5389 if (ifm->ifa_index)
6ecf4c37 5390 dev = dev_get_by_index(tgt_net, ifm->ifa_index);
6c223828 5391
6ecf4c37 5392 ifa = ipv6_get_ifaddr(tgt_net, addr, dev, 1);
e21e8467 5393 if (!ifa) {
1b29fc2c
TG		 5394 err = -EADDRNOTAVAIL;
5395 goto errout;
5396 }
6c223828 5397
e21e8467
SH		 5398 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
5399 if (!skb) {
6c223828 5400 err = -ENOBUFS;
1b29fc2c 5401 goto errout_ifa;
6c223828
NT		 5402 }
5403
203651b6 5404 err = inet6_fill_ifaddr(skb, ifa, &fillargs);
26932566
PM		 5405 if (err < 0) {
5406 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
5407 WARN_ON(err == -EMSGSIZE);
5408 kfree_skb(skb);
5409 goto errout_ifa;
5410 }
6ecf4c37 5411 err = rtnl_unicast(skb, tgt_net, NETLINK_CB(in_skb).portid);
1b29fc2c 5412errout_ifa:
6c223828 5413 in6_ifa_put(ifa);
1b29fc2c 5414errout:
c24675f8
FW		 5415 if (dev)
5416 dev_put(dev);
203651b6 5417 if (fillargs.netnsid >= 0)
6ecf4c37
CB		 5418 put_net(tgt_net);
5419
6c223828 5420 return err;
6c223828
NT		 5421}
5422
1da177e4
LT		 5423static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
5424{
5425 struct sk_buff *skb;
c346dca1 5426 struct net *net = dev_net(ifa->idev->dev);
203651b6
CB		 5427 struct inet6_fill_args fillargs = {
5428 .portid = 0,
5429 .seq = 0,
5430 .event = event,
5431 .flags = 0,
5432 .netnsid = -1,
5433 };
5d620266 5434 int err = -ENOBUFS;
1da177e4 5435
0ab6803b 5436 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
63159f29 5437 if (!skb)
5d620266
TG		 5438 goto errout;
5439
203651b6 5440 err = inet6_fill_ifaddr(skb, ifa, &fillargs);
26932566
PM		 5441 if (err < 0) {
5442 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
5443 WARN_ON(err == -EMSGSIZE);
5444 kfree_skb(skb);
5445 goto errout;
5446 }
1ce85fe4
PNA		 5447 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
5448 return;
5d620266
TG		 5449errout:
5450 if (err < 0)
6fda7350 5451 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
1da177e4
LT		 5452}
5453
b6f99a21 5454static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
1da177e4
LT		 5455 __s32 *array, int bytes)
5456{
04561c1f
TG		 5457 BUG_ON(bytes < (DEVCONF_MAX * 4));
5458
1da177e4
LT		 5459 memset(array, 0, bytes);
5460 array[DEVCONF_FORWARDING] = cnf->forwarding;
5461 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
5462 array[DEVCONF_MTU6] = cnf->mtu6;
5463 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
5464 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
5465 array[DEVCONF_AUTOCONF] = cnf->autoconf;
5466 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
5467 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
93908d19
TG		 5468 array[DEVCONF_RTR_SOLICIT_INTERVAL] =
5469 jiffies_to_msecs(cnf->rtr_solicit_interval);
bd11f074
MŻ		 5470 array[DEVCONF_RTR_SOLICIT_MAX_INTERVAL] =
5471 jiffies_to_msecs(cnf->rtr_solicit_max_interval);
93908d19
TG		 5472 array[DEVCONF_RTR_SOLICIT_DELAY] =
5473 jiffies_to_msecs(cnf->rtr_solicit_delay);
1da177e4 5474 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
fc4eba58
HFS		 5475 array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] =
5476 jiffies_to_msecs(cnf->mldv1_unsolicited_report_interval);
5477 array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] =
5478 jiffies_to_msecs(cnf->mldv2_unsolicited_report_interval);
1da177e4
LT		 5479 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
5480 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
5481 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
5482 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
5483 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
1da177e4 5484 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
65f5c7c1 5485 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
6b2e04bc 5486 array[DEVCONF_RA_DEFRTR_METRIC] = cnf->ra_defrtr_metric;
8013d1d7 5487 array[DEVCONF_ACCEPT_RA_MIN_HOP_LIMIT] = cnf->accept_ra_min_hop_limit;
c4fd30eb 5488 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
930d6ff2
YH		 5489#ifdef CONFIG_IPV6_ROUTER_PREF
5490 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
93908d19
TG		 5491 array[DEVCONF_RTR_PROBE_INTERVAL] =
5492 jiffies_to_msecs(cnf->rtr_probe_interval);
fa03ef38 5493#ifdef CONFIG_IPV6_ROUTE_INFO
bbea124b 5494 array[DEVCONF_ACCEPT_RA_RT_INFO_MIN_PLEN] = cnf->accept_ra_rt_info_min_plen;
09c884d4
YH		 5495 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
5496#endif
930d6ff2 5497#endif
fbea49e1 5498 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
0bcbc926 5499 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
95c385b4
NH		 5500#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
5501 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
7fd2561e 5502 array[DEVCONF_USE_OPTIMISTIC] = cnf->use_optimistic;
95c385b4 5503#endif
7bc570c8
YH		 5504#ifdef CONFIG_IPV6_MROUTE
5505 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
5506#endif
778d80be 5507 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
1b34be74 5508 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
c3faca05 5509 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
5cb04436 5510 array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify;
b800c3b9 5511 array[DEVCONF_SUPPRESS_FRAG_NDISC] = cnf->suppress_frag_ndisc;
d9333196 5512 array[DEVCONF_ACCEPT_RA_FROM_LOCAL] = cnf->accept_ra_from_local;
c2943f14 5513 array[DEVCONF_ACCEPT_RA_MTU] = cnf->accept_ra_mtu;
35103d11 5514 array[DEVCONF_IGNORE_ROUTES_WITH_LINKDOWN] = cnf->ignore_routes_with_linkdown;
3d1bec99 5515 /* we omit DEVCONF_STABLE_SECRET for now */
3985e8a3 5516 array[DEVCONF_USE_OIF_ADDRS_ONLY] = cnf->use_oif_addrs_only;
abbc3043 5517 array[DEVCONF_DROP_UNICAST_IN_L2_MULTICAST] = cnf->drop_unicast_in_l2_multicast;
7a02bf89 5518 array[DEVCONF_DROP_UNSOLICITED_NA] = cnf->drop_unsolicited_na;
f1705ec1 5519 array[DEVCONF_KEEP_ADDR_ON_DOWN] = cnf->keep_addr_on_down;
1ababeba 5520 array[DEVCONF_SEG6_ENABLED] = cnf->seg6_enabled;
bf355b8d
DL		 5521#ifdef CONFIG_IPV6_SEG6_HMAC
5522 array[DEVCONF_SEG6_REQUIRE_HMAC] = cnf->seg6_require_hmac;
5523#endif
adc176c5 5524 array[DEVCONF_ENHANCED_DAD] = cnf->enhanced_dad;
d35a00b8 5525 array[DEVCONF_ADDR_GEN_MODE] = cnf->addr_gen_mode;
df789fe7 5526 array[DEVCONF_DISABLE_POLICY] = cnf->disable_policy;
2210d6b2 5527 array[DEVCONF_NDISC_TCLASS] = cnf->ndisc_tclass;
8610c7c6 5528 array[DEVCONF_RPL_SEG_ENABLED] = cnf->rpl_seg_enabled;
1da177e4
LT		 5529}
5530
b382b191
TG		 5531static inline size_t inet6_ifla6_size(void)
5532{
5533 return nla_total_size(4) /* IFLA_INET6_FLAGS */
5534 + nla_total_size(sizeof(struct ifla_cacheinfo))
5535 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
5536 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
f53adae4 5537 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
bdd72f41
SD		 5538 + nla_total_size(sizeof(struct in6_addr)) /* IFLA_INET6_TOKEN */
5539 + nla_total_size(1) /* IFLA_INET6_ADDR_GEN_MODE */
5540 + 0;
b382b191
TG		 5541}
5542
339bf98f
TG		 5543static inline size_t inet6_if_nlmsg_size(void)
5544{
5545 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
5546 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
5547 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
5548 + nla_total_size(4) /* IFLA_MTU */
5549 + nla_total_size(4) /* IFLA_LINK */
0344338b 5550 + nla_total_size(1) /* IFLA_OPERSTATE */
b382b191 5551 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */
339bf98f 5552}
c5396a31 5553
be281e55 5554static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib,
aca05671 5555 int bytes)
7f7d9a6b
HX		 5556{
5557 int i;
aca05671 5558 int pad = bytes - sizeof(u64) * ICMP6_MIB_MAX;
7f7d9a6b
HX		 5559 BUG_ON(pad < 0);
5560
5561 /* Use put_unaligned() because stats may not be aligned for u64. */
aca05671
JH		 5562 put_unaligned(ICMP6_MIB_MAX, &stats[0]);
5563 for (i = 1; i < ICMP6_MIB_MAX; i++)
be281e55 5564 put_unaligned(atomic_long_read(&mib[i]), &stats[i]);
7f7d9a6b 5565
aca05671 5566 memset(&stats[ICMP6_MIB_MAX], 0, pad);
7f7d9a6b
HX		 5567}
5568
698365fa 5569static inline void __snmp6_fill_stats64(u64 *stats, void __percpu *mib,
a3a77372 5570 int bytes, size_t syncpoff)
4ce3c183 5571{
a3a77372
R		 5572 int i, c;
5573 u64 buff[IPSTATS_MIB_MAX];
5574 int pad = bytes - sizeof(u64) * IPSTATS_MIB_MAX;
5575
4ce3c183
ED		 5576 BUG_ON(pad < 0);
5577
a3a77372
R		 5578 memset(buff, 0, sizeof(buff));
5579 buff[0] = IPSTATS_MIB_MAX;
4ce3c183 5580
a3a77372
R		 5581 for_each_possible_cpu(c) {
5582 for (i = 1; i < IPSTATS_MIB_MAX; i++)
5583 buff[i] += snmp_get_cpu_field64(mib, c, i, syncpoff);
5584 }
5585
5586 memcpy(stats, buff, IPSTATS_MIB_MAX * sizeof(u64));
5587 memset(&stats[IPSTATS_MIB_MAX], 0, pad);
4ce3c183
ED		 5588}
5589
7f7d9a6b
HX		 5590static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
5591 int bytes)
5592{
e21e8467 5593 switch (attrtype) {
7f7d9a6b 5594 case IFLA_INET6_STATS:
a3a77372
R		 5595 __snmp6_fill_stats64(stats, idev->stats.ipv6, bytes,
5596 offsetof(struct ipstats_mib, syncp));
7f7d9a6b
HX		 5597 break;
5598 case IFLA_INET6_ICMP6STATS:
aca05671 5599 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, bytes);
7f7d9a6b
HX		 5600 break;
5601 }
5602}
5603
d5566fd7
SV		 5604static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev,
5605 u32 ext_filter_mask)
b382b191
TG		 5606{
5607 struct nlattr *nla;
5608 struct ifla_cacheinfo ci;
5609
c78679e8
DM		 5610 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags))
5611 goto nla_put_failure;
b382b191 5612 ci.max_reasm_len = IPV6_MAXPLEN;
24912420
DM		 5613 ci.tstamp = cstamp_delta(idev->tstamp);
5614 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time);
1f9248e5 5615 ci.retrans_time = jiffies_to_msecs(NEIGH_VAR(idev->nd_parms, RETRANS_TIME));
c78679e8
DM		 5616 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci))
5617 goto nla_put_failure;
b382b191 5618 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
63159f29 5619 if (!nla)
b382b191
TG		 5620 goto nla_put_failure;
5621 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
5622
5623 /* XXX - MC not implemented */
5624
d5566fd7
SV		 5625 if (ext_filter_mask & RTEXT_FILTER_SKIP_STATS)
5626 return 0;
5627
b382b191 5628 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
63159f29 5629 if (!nla)
b382b191
TG		 5630 goto nla_put_failure;
5631 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
5632
5633 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
63159f29 5634 if (!nla)
b382b191
TG		 5635 goto nla_put_failure;
5636 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
5637
f53adae4 5638 nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr));
63159f29 5639 if (!nla)
f53adae4
DB		 5640 goto nla_put_failure;
5641 read_lock_bh(&idev->lock);
5642 memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla));
5643 read_unlock_bh(&idev->lock);
5644
0d7982ce
ND		 5645 if (nla_put_u8(skb, IFLA_INET6_ADDR_GEN_MODE, idev->cnf.addr_gen_mode))
5646 goto nla_put_failure;
5647
b382b191
TG		 5648 return 0;
5649
5650nla_put_failure:
5651 return -EMSGSIZE;
5652}
5653
b1974ed0
AR		 5654static size_t inet6_get_link_af_size(const struct net_device *dev,
5655 u32 ext_filter_mask)
b382b191
TG		 5656{
5657 if (!__in6_dev_get(dev))
5658 return 0;
5659
5660 return inet6_ifla6_size();
5661}
5662
d5566fd7
SV		 5663static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev,
5664 u32 ext_filter_mask)
b382b191
TG		 5665{
5666 struct inet6_dev *idev = __in6_dev_get(dev);
5667
5668 if (!idev)
5669 return -ENODATA;
5670
d5566fd7 5671 if (inet6_fill_ifla6_attrs(skb, idev, ext_filter_mask) < 0)
b382b191
TG		 5672 return -EMSGSIZE;
5673
5674 return 0;
5675}
5676
3583a4e8
SH		 5677static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token,
5678 struct netlink_ext_ack *extack)
f53adae4 5679{
f53adae4
DB		 5680 struct inet6_ifaddr *ifp;
5681 struct net_device *dev = idev->dev;
47e27d5e 5682 bool clear_token, update_rs = false;
dc848292 5683 struct in6_addr ll_addr;
f53adae4 5684
c15b1cca
HFS		 5685 ASSERT_RTNL();
5686
63159f29 5687 if (!token)
f53adae4 5688 return -EINVAL;
3583a4e8
SH		 5689
5690 if (dev->flags & IFF_LOOPBACK) {
5691 NL_SET_ERR_MSG_MOD(extack, "Device is loopback");
f53adae4 5692 return -EINVAL;
3583a4e8
SH		 5693 }
5694
5695 if (dev->flags & IFF_NOARP) {
5696 NL_SET_ERR_MSG_MOD(extack,
5697 "Device does not do neighbour discovery");
5698 return -EINVAL;
5699 }
5700
5701 if (!ipv6_accept_ra(idev)) {
5702 NL_SET_ERR_MSG_MOD(extack,
5703 "Router advertisement is disabled on device");
f53adae4 5704 return -EINVAL;
3583a4e8
SH		 5705 }
5706
5707 if (idev->cnf.rtr_solicits == 0) {
5708 NL_SET_ERR_MSG(extack,
5709 "Router solicitation is disabled on device");
f53adae4 5710 return -EINVAL;
3583a4e8 5711 }
f53adae4
DB		 5712
5713 write_lock_bh(&idev->lock);
5714
5715 BUILD_BUG_ON(sizeof(token->s6_addr) != 16);
5716 memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8);
5717
5718 write_unlock_bh(&idev->lock);
5719
47e27d5e
DB		 5720 clear_token = ipv6_addr_any(token);
5721 if (clear_token)
5722 goto update_lft;
5723
dc848292
HFS		 5724 if (!idev->dead && (idev->if_flags & IF_READY) &&
5725 !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE |
5726 IFA_F_OPTIMISTIC)) {
fc403832
DB		 5727 /* If we're not ready, then normal ifup will take care
5728 * of this. Otherwise, we need to request our rs here.
5729 */
5730 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters);
5731 update_rs = true;
5732 }
f53adae4 5733
47e27d5e 5734update_lft:
f53adae4 5735 write_lock_bh(&idev->lock);
fc403832 5736
77ecaace 5737 if (update_rs) {
fc403832 5738 idev->if_flags |= IF_RS_SENT;
bd11f074
MŻ		 5739 idev->rs_interval = rfc3315_s14_backoff_init(
5740 idev->cnf.rtr_solicit_interval);
77ecaace 5741 idev->rs_probes = 1;
bd11f074 5742 addrconf_mod_rs_timer(idev, idev->rs_interval);
77ecaace 5743 }
f53adae4
DB		 5744
5745 /* Well, that's kinda nasty ... */
5746 list_for_each_entry(ifp, &idev->addr_list, if_list) {
5747 spin_lock(&ifp->lock);
617fe29d 5748 if (ifp->tokenized) {
f53adae4
DB		 5749 ifp->valid_lft = 0;
5750 ifp->prefered_lft = 0;
5751 }
5752 spin_unlock(&ifp->lock);
5753 }
5754
5755 write_unlock_bh(&idev->lock);
b2ed64a9 5756 inet6_ifinfo_notify(RTM_NEWLINK, idev);
c15b1cca 5757 addrconf_verify_rtnl();
f53adae4
DB		 5758 return 0;
5759}
5760
11b1f828
DB		 5761static const struct nla_policy inet6_af_policy[IFLA_INET6_MAX + 1] = {
5762 [IFLA_INET6_ADDR_GEN_MODE] = { .type = NLA_U8 },
5763 [IFLA_INET6_TOKEN] = { .len = sizeof(struct in6_addr) },
5764};
5765
d35a00b8
FJ		 5766static int check_addr_gen_mode(int mode)
5767{
5768 if (mode != IN6_ADDR_GEN_MODE_EUI64 &&
5769 mode != IN6_ADDR_GEN_MODE_NONE &&
5770 mode != IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
5771 mode != IN6_ADDR_GEN_MODE_RANDOM)
5772 return -EINVAL;
5773 return 1;
5774}
5775
5776static int check_stable_privacy(struct inet6_dev *idev, struct net *net,
5777 int mode)
5778{
5779 if (mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
5780 !idev->cnf.stable_secret.initialized &&
5781 !net->ipv6.devconf_dflt->stable_secret.initialized)
5782 return -EINVAL;
5783 return 1;
5784}
5785
7dc2bcca
MM		 5786static int inet6_validate_link_af(const struct net_device *dev,
5787 const struct nlattr *nla)
5788{
5789 struct nlattr *tb[IFLA_INET6_MAX + 1];
5790 struct inet6_dev *idev = NULL;
5791 int err;
5792
5793 if (dev) {
5794 idev = __in6_dev_get(dev);
5795 if (!idev)
5796 return -EAFNOSUPPORT;
5797 }
5798
5799 err = nla_parse_nested_deprecated(tb, IFLA_INET6_MAX, nla,
5800 inet6_af_policy, NULL);
5801 if (err)
5802 return err;
5803
5804 if (!tb[IFLA_INET6_TOKEN] && !tb[IFLA_INET6_ADDR_GEN_MODE])
5805 return -EINVAL;
5806
5807 if (tb[IFLA_INET6_ADDR_GEN_MODE]) {
5808 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]);
5809
5810 if (check_addr_gen_mode(mode) < 0)
5811 return -EINVAL;
5812 if (dev && check_stable_privacy(idev, dev_net(dev), mode) < 0)
5813 return -EINVAL;
5814 }
5815
5816 return 0;
5817}
5818
3583a4e8
SH		 5819static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla,
5820 struct netlink_ext_ack *extack)
f53adae4 5821{
f53adae4
DB		 5822 struct inet6_dev *idev = __in6_dev_get(dev);
5823 struct nlattr *tb[IFLA_INET6_MAX + 1];
7dc2bcca 5824 int err;
f53adae4 5825
db3fa271
ED		 5826 if (!idev)
5827 return -EAFNOSUPPORT;
5828
8cb08174 5829 if (nla_parse_nested_deprecated(tb, IFLA_INET6_MAX, nla, NULL, NULL) < 0)
f53adae4
DB		 5830 BUG();
5831
bc91b0f0 5832 if (tb[IFLA_INET6_TOKEN]) {
3583a4e8
SH		 5833 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN]),
5834 extack);
bc91b0f0
JP		 5835 if (err)
5836 return err;
5837 }
5838
5839 if (tb[IFLA_INET6_ADDR_GEN_MODE]) {
5840 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]);
5841
d35a00b8 5842 idev->cnf.addr_gen_mode = mode;
bc91b0f0 5843 }
f53adae4 5844
7dc2bcca 5845 return 0;
f53adae4
DB		 5846}
5847
1ab1457c 5848static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
15e47304 5849 u32 portid, u32 seq, int event, unsigned int flags)
1da177e4 5850{
04561c1f 5851 struct net_device *dev = idev->dev;
04561c1f
TG		 5852 struct ifinfomsg *hdr;
5853 struct nlmsghdr *nlh;
5854 void *protoinfo;
04561c1f 5855
15e47304 5856 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags);
63159f29 5857 if (!nlh)
26932566 5858 return -EMSGSIZE;
04561c1f
TG		 5859
5860 hdr = nlmsg_data(nlh);
5861 hdr->ifi_family = AF_INET6;
5862 hdr->__ifi_pad = 0;
5863 hdr->ifi_type = dev->type;
5864 hdr->ifi_index = dev->ifindex;
5865 hdr->ifi_flags = dev_get_flags(dev);
5866 hdr->ifi_change = 0;
5867
c78679e8
DM		 5868 if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
5869 (dev->addr_len &&
5870 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
5871 nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
a54acb3a 5872 (dev->ifindex != dev_get_iflink(dev) &&
0344338b
AG		 5873 nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))) ||
5874 nla_put_u8(skb, IFLA_OPERSTATE,
5875 netif_running(dev) ? dev->operstate : IF_OPER_DOWN))
c78679e8 5876 goto nla_put_failure;
ae0be8de 5877 protoinfo = nla_nest_start_noflag(skb, IFLA_PROTINFO);
63159f29 5878 if (!protoinfo)
04561c1f 5879 goto nla_put_failure;
1da177e4 5880
d5566fd7 5881 if (inet6_fill_ifla6_attrs(skb, idev, 0) < 0)
bf99f1bd 5882 goto nla_put_failure;
1da177e4 5883
04561c1f 5884 nla_nest_end(skb, protoinfo);
053c095a
JB		 5885 nlmsg_end(skb, nlh);
5886 return 0;
1da177e4 5887
04561c1f 5888nla_put_failure:
26932566
PM		 5889 nlmsg_cancel(skb, nlh);
5890 return -EMSGSIZE;
1da177e4
LT		 5891}
5892
786e0007
DA		 5893static int inet6_valid_dump_ifinfo(const struct nlmsghdr *nlh,
5894 struct netlink_ext_ack *extack)
5895{
5896 struct ifinfomsg *ifm;
5897
5898 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) {
5899 NL_SET_ERR_MSG_MOD(extack, "Invalid header for link dump request");
5900 return -EINVAL;
5901 }
5902
5903 if (nlmsg_attrlen(nlh, sizeof(*ifm))) {
5904 NL_SET_ERR_MSG_MOD(extack, "Invalid data after header");
5905 return -EINVAL;
5906 }
5907
5908 ifm = nlmsg_data(nlh);
5909 if (ifm->__ifi_pad || ifm->ifi_type || ifm->ifi_flags ||
5910 ifm->ifi_change || ifm->ifi_index) {
5911 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for dump request");
5912 return -EINVAL;
5913 }
5914
5915 return 0;
5916}
5917
1da177e4
LT		 5918static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
5919{
3b1e0a65 5920 struct net *net = sock_net(skb->sk);
84d2697d 5921 int h, s_h;
434a8a58 5922 int idx = 0, s_idx;
1da177e4
LT		 5923 struct net_device *dev;
5924 struct inet6_dev *idev;
84d2697d 5925 struct hlist_head *head;
1da177e4 5926
786e0007
DA		 5927 /* only requests using strict checking can pass data to
5928 * influence the dump
5929 */
5930 if (cb->strict_check) {
5931 int err = inet6_valid_dump_ifinfo(cb->nlh, cb->extack);
5932
5933 if (err < 0)
5934 return err;
5935 }
5936
84d2697d
ED		 5937 s_h = cb->args[0];
5938 s_idx = cb->args[1];
5939
5940 rcu_read_lock();
5941 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
5942 idx = 0;
5943 head = &net->dev_index_head[h];
b67bfe0d 5944 hlist_for_each_entry_rcu(dev, head, index_hlist) {
84d2697d
ED		 5945 if (idx < s_idx)
5946 goto cont;
5947 idev = __in6_dev_get(dev);
5948 if (!idev)
5949 goto cont;
5950 if (inet6_fill_ifinfo(skb, idev,
15e47304 5951 NETLINK_CB(cb->skb).portid,
84d2697d 5952 cb->nlh->nlmsg_seq,
053c095a 5953 RTM_NEWLINK, NLM_F_MULTI) < 0)
84d2697d 5954 goto out;
7562f876 5955cont:
84d2697d
ED		 5956 idx++;
5957 }
1da177e4 5958 }
84d2697d
ED		 5959out:
5960 rcu_read_unlock();
5961 cb->args[1] = idx;
5962 cb->args[0] = h;
1da177e4
LT		 5963
5964 return skb->len;
5965}
5966
5967void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
5968{
5969 struct sk_buff *skb;
c346dca1 5970 struct net *net = dev_net(idev->dev);
8d7a76c9 5971 int err = -ENOBUFS;
1ab1457c 5972
339bf98f 5973 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
63159f29 5974 if (!skb)
8d7a76c9
TG		 5975 goto errout;
5976
5977 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
26932566
PM		 5978 if (err < 0) {
5979 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
5980 WARN_ON(err == -EMSGSIZE);
5981 kfree_skb(skb);
5982 goto errout;
5983 }
5f75a104 5984 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC);
1ce85fe4 5985 return;
8d7a76c9
TG		 5986errout:
5987 if (err < 0)
5f75a104 5988 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err);
1da177e4
LT		 5989}
5990
339bf98f
TG		 5991static inline size_t inet6_prefix_nlmsg_size(void)
5992{
5993 return NLMSG_ALIGN(sizeof(struct prefixmsg))
5994 + nla_total_size(sizeof(struct in6_addr))
5995 + nla_total_size(sizeof(struct prefix_cacheinfo));
5996}
c5396a31 5997
1da177e4 5998static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
15e47304 5999 struct prefix_info *pinfo, u32 portid, u32 seq,
6051e2f4 6000 int event, unsigned int flags)
1da177e4 6001{
6051e2f4
TG		 6002 struct prefixmsg *pmsg;
6003 struct nlmsghdr *nlh;
1da177e4
LT		 6004 struct prefix_cacheinfo ci;
6005
15e47304 6006 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags);
63159f29 6007 if (!nlh)
26932566 6008 return -EMSGSIZE;
6051e2f4
TG		 6009
6010 pmsg = nlmsg_data(nlh);
1da177e4 6011 pmsg->prefix_family = AF_INET6;
8a47077a
PM		 6012 pmsg->prefix_pad1 = 0;
6013 pmsg->prefix_pad2 = 0;
1da177e4
LT		 6014 pmsg->prefix_ifindex = idev->dev->ifindex;
6015 pmsg->prefix_len = pinfo->prefix_len;
6016 pmsg->prefix_type = pinfo->type;
8a47077a 6017 pmsg->prefix_pad3 = 0;
1da177e4
LT		 6018 pmsg->prefix_flags = 0;
6019 if (pinfo->onlink)
6020 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
6021 if (pinfo->autoconf)
6022 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
6023
c78679e8
DM		 6024 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix))
6025 goto nla_put_failure;
1da177e4
LT		 6026 ci.preferred_time = ntohl(pinfo->prefered);
6027 ci.valid_time = ntohl(pinfo->valid);
c78679e8
DM		 6028 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci))
6029 goto nla_put_failure;
053c095a
JB		 6030 nlmsg_end(skb, nlh);
6031 return 0;
1da177e4 6032
6051e2f4 6033nla_put_failure:
26932566
PM		 6034 nlmsg_cancel(skb, nlh);
6035 return -EMSGSIZE;
1da177e4
LT		 6036}
6037
1ab1457c 6038static void inet6_prefix_notify(int event, struct inet6_dev *idev,
1da177e4
LT		 6039 struct prefix_info *pinfo)
6040{
6041 struct sk_buff *skb;
c346dca1 6042 struct net *net = dev_net(idev->dev);
8c384bfa 6043 int err = -ENOBUFS;
1da177e4 6044
339bf98f 6045 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
63159f29 6046 if (!skb)
8c384bfa
TG		 6047 goto errout;
6048
6049 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
26932566
PM		 6050 if (err < 0) {
6051 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
6052 WARN_ON(err == -EMSGSIZE);
6053 kfree_skb(skb);
6054 goto errout;
6055 }
1ce85fe4
PNA		 6056 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
6057 return;
8c384bfa
TG		 6058errout:
6059 if (err < 0)
6fda7350 6060 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
1da177e4
LT		 6061}
6062
1da177e4
LT		 6063static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
6064{
63998ac2
ND		 6065 struct net *net = dev_net(ifp->idev->dev);
6066
c15b1cca
HFS		 6067 if (event)
6068 ASSERT_RTNL();
6069
1da177e4
LT		 6070 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
6071
6072 switch (event) {
6073 case RTM_NEWADDR:
95c385b4 6074 /*
2d819d25
DA		 6075 * If the address was optimistic we inserted the route at the
6076 * start of our DAD process, so we don't need to do it again.
6077 * If the device was taken down in the middle of the DAD
6078 * cycle there is a race where we could get here without a
6079 * host route, so nothing to insert. That will be fixed when
6080 * the device is brought up.
95c385b4 6081 */
2d819d25 6082 if (ifp->rt && !rcu_access_pointer(ifp->rt->fib6_node)) {
afb1d4b5 6083 ip6_ins_rt(net, ifp->rt);
2d819d25
DA		 6084 } else if (!ifp->rt && (ifp->idev->dev->flags & IFF_UP)) {
6085 pr_warn("BUG: Address %pI6c on device %s is missing its host route.\n",
6086 &ifp->addr, ifp->idev->dev->name);
6087 }
6088
1da177e4
LT		 6089 if (ifp->idev->cnf.forwarding)
6090 addrconf_join_anycast(ifp);
7996c799 6091 if (!ipv6_addr_any(&ifp->peer_addr))
07758eb9
HL		 6092 addrconf_prefix_route(&ifp->peer_addr, 128,
6093 ifp->rt_priority, ifp->idev->dev,
6094 0, 0, GFP_ATOMIC);
1da177e4
LT		 6095 break;
6096 case RTM_DELADDR:
6097 if (ifp->idev->cnf.forwarding)
6098 addrconf_leave_anycast(ifp);
6099 addrconf_leave_solict(ifp->idev, &ifp->addr);
7996c799 6100 if (!ipv6_addr_any(&ifp->peer_addr)) {
8d1c802b 6101 struct fib6_info *rt;
caeaba79 6102
e7478dfc 6103 rt = addrconf_get_prefix_route(&ifp->peer_addr, 128,
2b2450ca
DA		 6104 ifp->idev->dev, 0, 0,
6105 false);
8e3d5be7 6106 if (rt)
11dd74b3 6107 ip6_del_rt(net, rt, false);
caeaba79 6108 }
38bd10c4 6109 if (ifp->rt) {
11dd74b3 6110 ip6_del_rt(net, ifp->rt, false);
93531c67 6111 ifp->rt = NULL;
38bd10c4 6112 }
705f1c86 6113 rt_genid_bump_ipv6(net);
1da177e4
LT		 6114 break;
6115 }
63998ac2 6116 atomic_inc(&net->ipv6.dev_addr_genid);
1da177e4
LT		 6117}
6118
6119static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
6120{
1da177e4
LT		 6121 if (likely(ifp->idev->dead == 0))
6122 __ipv6_ifa_notify(event, ifp);
1da177e4
LT		 6123}
6124
6125#ifdef CONFIG_SYSCTL
6126
32927393
CH		 6127static int addrconf_sysctl_forward(struct ctl_table *ctl, int write,
6128 void *buffer, size_t *lenp, loff_t *ppos)
1da177e4
LT		 6129{
6130 int *valp = ctl->data;
6131 int val = *valp;
88af182e 6132 loff_t pos = *ppos;
fe2c6338 6133 struct ctl_table lctl;
1da177e4
LT		 6134 int ret;
6135
013d97e9
FR		 6136 /*
6137 * ctl->data points to idev->cnf.forwarding, we should
6138 * not modify it until we get the rtnl lock.
6139 */
6140 lctl = *ctl;
6141 lctl.data = &val;
6142
6143 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
1da177e4 6144
c8fecf22 6145 if (write)
b325fddb 6146 ret = addrconf_fixup_forwarding(ctl, valp, val);
88af182e
EB		 6147 if (ret)
6148 *ppos = pos;
1ab1457c 6149 return ret;
1da177e4
LT		 6150}
6151
32927393
CH		 6152static int addrconf_sysctl_mtu(struct ctl_table *ctl, int write,
6153 void *buffer, size_t *lenp, loff_t *ppos)
77751427
ML		 6154{
6155 struct inet6_dev *idev = ctl->extra1;
6156 int min_mtu = IPV6_MIN_MTU;
6157 struct ctl_table lctl;
6158
6159 lctl = *ctl;
6160 lctl.extra1 = &min_mtu;
6161 lctl.extra2 = idev ? &idev->dev->mtu : NULL;
6162
6163 return proc_dointvec_minmax(&lctl, write, buffer, lenp, ppos);
6164}
6165
56d417b1
BH		 6166static void dev_disable_change(struct inet6_dev *idev)
6167{
75538c2b
CW		 6168 struct netdev_notifier_info info;
6169
56d417b1
BH		 6170 if (!idev || !idev->dev)
6171 return;
6172
75538c2b 6173 netdev_notifier_info_init(&info, idev->dev);
56d417b1 6174 if (idev->cnf.disable_ipv6)
75538c2b 6175 addrconf_notify(NULL, NETDEV_DOWN, &info);
56d417b1 6176 else
75538c2b 6177 addrconf_notify(NULL, NETDEV_UP, &info);
56d417b1
BH		 6178}
6179
6180static void addrconf_disable_change(struct net *net, __s32 newf)
6181{
6182 struct net_device *dev;
6183 struct inet6_dev *idev;
6184
03e4deff 6185 for_each_netdev(net, dev) {
56d417b1
BH		 6186 idev = __in6_dev_get(dev);
6187 if (idev) {
6188 int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
6189 idev->cnf.disable_ipv6 = newf;
6190 if (changed)
6191 dev_disable_change(idev);
6192 }
56d417b1 6193 }
56d417b1
BH		 6194}
6195
013d97e9 6196static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf)
56d417b1
BH		 6197{
6198 struct net *net;
013d97e9
FR		 6199 int old;
6200
6201 if (!rtnl_trylock())
6202 return restart_syscall();
56d417b1
BH		 6203
6204 net = (struct net *)table->extra2;
013d97e9
FR		 6205 old = *p;
6206 *p = newf;
56d417b1 6207
013d97e9
FR		 6208 if (p == &net->ipv6.devconf_dflt->disable_ipv6) {
6209 rtnl_unlock();
56d417b1 6210 return 0;
88af182e 6211 }
56d417b1
BH		 6212
6213 if (p == &net->ipv6.devconf_all->disable_ipv6) {
56d417b1
BH		 6214 net->ipv6.devconf_dflt->disable_ipv6 = newf;
6215 addrconf_disable_change(net, newf);
013d97e9 6216 } else if ((!newf) ^ (!old))
56d417b1
BH		 6217 dev_disable_change((struct inet6_dev *)table->extra1);
6218
6219 rtnl_unlock();
6220 return 0;
6221}
6222
32927393
CH		 6223static int addrconf_sysctl_disable(struct ctl_table *ctl, int write,
6224 void *buffer, size_t *lenp, loff_t *ppos)
56d417b1
BH		 6225{
6226 int *valp = ctl->data;
6227 int val = *valp;
88af182e 6228 loff_t pos = *ppos;
fe2c6338 6229 struct ctl_table lctl;
56d417b1
BH		 6230 int ret;
6231
013d97e9
FR		 6232 /*
6233 * ctl->data points to idev->cnf.disable_ipv6, we should
6234 * not modify it until we get the rtnl lock.
6235 */
6236 lctl = *ctl;
6237 lctl.data = &val;
6238
6239 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
56d417b1
BH		 6240
6241 if (write)
6242 ret = addrconf_disable_ipv6(ctl, valp, val);
88af182e
EB		 6243 if (ret)
6244 *ppos = pos;
56d417b1
BH		 6245 return ret;
6246}
6247
32927393
CH		 6248static int addrconf_sysctl_proxy_ndp(struct ctl_table *ctl, int write,
6249 void *buffer, size_t *lenp, loff_t *ppos)
c92d5491 6250{
6251 int *valp = ctl->data;
6252 int ret;
6253 int old, new;
6254
6255 old = *valp;
6256 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
6257 new = *valp;
6258
6259 if (write && old != new) {
6260 struct net *net = ctl->extra2;
6261
6262 if (!rtnl_trylock())
6263 return restart_syscall();
6264
6265 if (valp == &net->ipv6.devconf_dflt->proxy_ndp)
85b3daad
DA		 6266 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
6267 NETCONFA_PROXY_NEIGH,
c92d5491 6268 NETCONFA_IFINDEX_DEFAULT,
6269 net->ipv6.devconf_dflt);
6270 else if (valp == &net->ipv6.devconf_all->proxy_ndp)
85b3daad
DA		 6271 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
6272 NETCONFA_PROXY_NEIGH,
c92d5491 6273 NETCONFA_IFINDEX_ALL,
6274 net->ipv6.devconf_all);
6275 else {
6276 struct inet6_dev *idev = ctl->extra1;
6277
85b3daad
DA		 6278 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
6279 NETCONFA_PROXY_NEIGH,
c92d5491 6280 idev->dev->ifindex,
6281 &idev->cnf);
6282 }
6283 rtnl_unlock();
6284 }
6285
6286 return ret;
6287}
6288
d35a00b8 6289static int addrconf_sysctl_addr_gen_mode(struct ctl_table *ctl, int write,
32927393 6290 void *buffer, size_t *lenp,
d35a00b8
FJ		 6291 loff_t *ppos)
6292{
6293 int ret = 0;
c6dbf7aa 6294 u32 new_val;
d35a00b8
FJ		 6295 struct inet6_dev *idev = (struct inet6_dev *)ctl->extra1;
6296 struct net *net = (struct net *)ctl->extra2;
c6dbf7aa
SD		 6297 struct ctl_table tmp = {
6298 .data = &new_val,
6299 .maxlen = sizeof(new_val),
6300 .mode = ctl->mode,
6301 };
d35a00b8 6302
8c171d6c
FJ		 6303 if (!rtnl_trylock())
6304 return restart_syscall();
6305
c6dbf7aa 6306 new_val = *((u32 *)ctl->data);
d35a00b8 6307
c6dbf7aa
SD		 6308 ret = proc_douintvec(&tmp, write, buffer, lenp, ppos);
6309 if (ret != 0)
6310 goto out;
d35a00b8 6311
c6dbf7aa 6312 if (write) {
8c171d6c
FJ		 6313 if (check_addr_gen_mode(new_val) < 0) {
6314 ret = -EINVAL;
6315 goto out;
6316 }
d35a00b8 6317
c6dbf7aa 6318 if (idev) {
8c171d6c
FJ		 6319 if (check_stable_privacy(idev, net, new_val) < 0) {
6320 ret = -EINVAL;
6321 goto out;
6322 }
d35a00b8
FJ		 6323
6324 if (idev->cnf.addr_gen_mode != new_val) {
6325 idev->cnf.addr_gen_mode = new_val;
d35a00b8 6326 addrconf_dev_config(idev->dev);
d35a00b8 6327 }
f24c5987
SD		 6328 } else if (&net->ipv6.devconf_all->addr_gen_mode == ctl->data) {
6329 struct net_device *dev;
6330
6331 net->ipv6.devconf_dflt->addr_gen_mode = new_val;
6332 for_each_netdev(net, dev) {
6333 idev = __in6_dev_get(dev);
6334 if (idev &&
6335 idev->cnf.addr_gen_mode != new_val) {
6336 idev->cnf.addr_gen_mode = new_val;
6337 addrconf_dev_config(idev->dev);
6338 }
6339 }
d35a00b8 6340 }
c6dbf7aa
SD		 6341
6342 *((u32 *)ctl->data) = new_val;
d35a00b8
FJ		 6343 }
6344
8c171d6c
FJ		 6345out:
6346 rtnl_unlock();
6347
d35a00b8
FJ		 6348 return ret;
6349}
6350
3d1bec99 6351static int addrconf_sysctl_stable_secret(struct ctl_table *ctl, int write,
32927393 6352 void *buffer, size_t *lenp,
3d1bec99
HFS		 6353 loff_t *ppos)
6354{
6355 int err;
6356 struct in6_addr addr;
6357 char str[IPV6_MAX_STRLEN];
6358 struct ctl_table lctl = *ctl;
622c81d5 6359 struct net *net = ctl->extra2;
3d1bec99
HFS		 6360 struct ipv6_stable_secret *secret = ctl->data;
6361
622c81d5
HFS		 6362 if (&net->ipv6.devconf_all->stable_secret == ctl->data)
6363 return -EIO;
6364
3d1bec99
HFS		 6365 lctl.maxlen = IPV6_MAX_STRLEN;
6366 lctl.data = str;
6367
6368 if (!rtnl_trylock())
6369 return restart_syscall();
6370
6371 if (!write && !secret->initialized) {
6372 err = -EIO;
6373 goto out;
6374 }
6375
5449a5ca
WC		 6376 err = snprintf(str, sizeof(str), "%pI6", &secret->secret);
6377 if (err >= sizeof(str)) {
6378 err = -EIO;
6379 goto out;
3d1bec99
HFS		 6380 }
6381
6382 err = proc_dostring(&lctl, write, buffer, lenp, ppos);
6383 if (err || !write)
6384 goto out;
6385
6386 if (in6_pton(str, -1, addr.in6_u.u6_addr8, -1, NULL) != 1) {
6387 err = -EIO;
6388 goto out;
6389 }
6390
6391 secret->initialized = true;
6392 secret->secret = addr;
6393
622c81d5
HFS		 6394 if (&net->ipv6.devconf_dflt->stable_secret == ctl->data) {
6395 struct net_device *dev;
6396
6397 for_each_netdev(net, dev) {
6398 struct inet6_dev *idev = __in6_dev_get(dev);
6399
6400 if (idev) {
d35a00b8 6401 idev->cnf.addr_gen_mode =
622c81d5
HFS		 6402 IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
6403 }
6404 }
6405 } else {
6406 struct inet6_dev *idev = ctl->extra1;
6407
d35a00b8 6408 idev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
622c81d5
HFS		 6409 }
6410
3d1bec99
HFS		 6411out:
6412 rtnl_unlock();
6413
6414 return err;
6415}
c92d5491 6416
35103d11
AG		 6417static
6418int addrconf_sysctl_ignore_routes_with_linkdown(struct ctl_table *ctl,
32927393 6419 int write, void *buffer,
35103d11
AG		 6420 size_t *lenp,
6421 loff_t *ppos)
6422{
6423 int *valp = ctl->data;
6424 int val = *valp;
6425 loff_t pos = *ppos;
6426 struct ctl_table lctl;
6427 int ret;
6428
6429 /* ctl->data points to idev->cnf.ignore_routes_when_linkdown
6430 * we should not modify it until we get the rtnl lock.
6431 */
6432 lctl = *ctl;
6433 lctl.data = &val;
6434
6435 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
6436
6437 if (write)
6438 ret = addrconf_fixup_linkdown(ctl, valp, val);
6439 if (ret)
6440 *ppos = pos;
6441 return ret;
6442}
6443
df789fe7
DF		 6444static
6445void addrconf_set_nopolicy(struct rt6_info *rt, int action)
6446{
6447 if (rt) {
6448 if (action)
6449 rt->dst.flags |= DST_NOPOLICY;
6450 else
6451 rt->dst.flags &= ~DST_NOPOLICY;
6452 }
6453}
6454
6455static
6456void addrconf_disable_policy_idev(struct inet6_dev *idev, int val)
6457{
6458 struct inet6_ifaddr *ifa;
6459
6460 read_lock_bh(&idev->lock);
6461 list_for_each_entry(ifa, &idev->addr_list, if_list) {
6462 spin_lock(&ifa->lock);
6463 if (ifa->rt) {
f88d8ea6 6464 /* host routes only use builtin fib6_nh */
1cf844c7 6465 struct fib6_nh *nh = ifa->rt->fib6_nh;
df789fe7
DF		 6466 int cpu;
6467
66f5d6ce 6468 rcu_read_lock();
3b6761d1 6469 ifa->rt->dst_nopolicy = val ? true : false;
f40b6ae2 6470 if (nh->rt6i_pcpu) {
df789fe7
DF		 6471 for_each_possible_cpu(cpu) {
6472 struct rt6_info **rtp;
6473
f40b6ae2 6474 rtp = per_cpu_ptr(nh->rt6i_pcpu, cpu);
df789fe7
DF		 6475 addrconf_set_nopolicy(*rtp, val);
6476 }
6477 }
66f5d6ce 6478 rcu_read_unlock();
df789fe7
DF		 6479 }
6480 spin_unlock(&ifa->lock);
6481 }
6482 read_unlock_bh(&idev->lock);
6483}
6484
6485static
6486int addrconf_disable_policy(struct ctl_table *ctl, int *valp, int val)
6487{
6488 struct inet6_dev *idev;
6489 struct net *net;
6490
6491 if (!rtnl_trylock())
6492 return restart_syscall();
6493
6494 *valp = val;
6495
6496 net = (struct net *)ctl->extra2;
6497 if (valp == &net->ipv6.devconf_dflt->disable_policy) {
6498 rtnl_unlock();
6499 return 0;
6500 }
6501
6502 if (valp == &net->ipv6.devconf_all->disable_policy) {
6503 struct net_device *dev;
6504
6505 for_each_netdev(net, dev) {
6506 idev = __in6_dev_get(dev);
6507 if (idev)
6508 addrconf_disable_policy_idev(idev, val);
6509 }
6510 } else {
6511 idev = (struct inet6_dev *)ctl->extra1;
6512 addrconf_disable_policy_idev(idev, val);
6513 }
6514
6515 rtnl_unlock();
6516 return 0;
6517}
6518
32927393
CH		 6519static int addrconf_sysctl_disable_policy(struct ctl_table *ctl, int write,
6520 void *buffer, size_t *lenp, loff_t *ppos)
df789fe7
DF		 6521{
6522 int *valp = ctl->data;
6523 int val = *valp;
6524 loff_t pos = *ppos;
6525 struct ctl_table lctl;
6526 int ret;
6527
6528 lctl = *ctl;
6529 lctl.data = &val;
6530 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
6531
6532 if (write && (*valp != val))
6533 ret = addrconf_disable_policy(ctl, valp, val);
6534
6535 if (ret)
6536 *ppos = pos;
6537
6538 return ret;
6539}
6540
cb4a4c69 6541static int minus_one = -1;
cb9e684e
MŻ		 6542static const int two_five_five = 255;
6543
607ea7cd 6544static const struct ctl_table addrconf_sysctl[] = {
5df1f77f
KK		 6545 {
6546 .procname = "forwarding",
6547 .data = &ipv6_devconf.forwarding,
6548 .maxlen = sizeof(int),
6549 .mode = 0644,
6550 .proc_handler = addrconf_sysctl_forward,
6551 },
6552 {
6553 .procname = "hop_limit",
6554 .data = &ipv6_devconf.hop_limit,
6555 .maxlen = sizeof(int),
6556 .mode = 0644,
cb9e684e 6557 .proc_handler = proc_dointvec_minmax,
eec4844f 6558 .extra1 = (void *)SYSCTL_ONE,
cb9e684e 6559 .extra2 = (void *)&two_five_five,
5df1f77f
KK		 6560 },
6561 {
6562 .procname = "mtu",
6563 .data = &ipv6_devconf.mtu6,
6564 .maxlen = sizeof(int),
6565 .mode = 0644,
6566 .proc_handler = addrconf_sysctl_mtu,
6567 },
6568 {
6569 .procname = "accept_ra",
6570 .data = &ipv6_devconf.accept_ra,
6571 .maxlen = sizeof(int),
6572 .mode = 0644,
6573 .proc_handler = proc_dointvec,
6574 },
6575 {
6576 .procname = "accept_redirects",
6577 .data = &ipv6_devconf.accept_redirects,
6578 .maxlen = sizeof(int),
6579 .mode = 0644,
6580 .proc_handler = proc_dointvec,
6581 },
6582 {
6583 .procname = "autoconf",
6584 .data = &ipv6_devconf.autoconf,
6585 .maxlen = sizeof(int),
6586 .mode = 0644,
6587 .proc_handler = proc_dointvec,
6588 },
6589 {
6590 .procname = "dad_transmits",
6591 .data = &ipv6_devconf.dad_transmits,
6592 .maxlen = sizeof(int),
6593 .mode = 0644,
6594 .proc_handler = proc_dointvec,
6595 },
6596 {
6597 .procname = "router_solicitations",
6598 .data = &ipv6_devconf.rtr_solicits,
6599 .maxlen = sizeof(int),
6600 .mode = 0644,
cb4a4c69
MŻ		 6601 .proc_handler = proc_dointvec_minmax,
6602 .extra1 = &minus_one,
5df1f77f
KK		 6603 },
6604 {
6605 .procname = "router_solicitation_interval",
6606 .data = &ipv6_devconf.rtr_solicit_interval,
6607 .maxlen = sizeof(int),
6608 .mode = 0644,
6609 .proc_handler = proc_dointvec_jiffies,
6610 },
bd11f074
MŻ		 6611 {
6612 .procname = "router_solicitation_max_interval",
6613 .data = &ipv6_devconf.rtr_solicit_max_interval,
6614 .maxlen = sizeof(int),
6615 .mode = 0644,
6616 .proc_handler = proc_dointvec_jiffies,
6617 },
5df1f77f
KK		 6618 {
6619 .procname = "router_solicitation_delay",
6620 .data = &ipv6_devconf.rtr_solicit_delay,
6621 .maxlen = sizeof(int),
6622 .mode = 0644,
6623 .proc_handler = proc_dointvec_jiffies,
6624 },
6625 {
6626 .procname = "force_mld_version",
6627 .data = &ipv6_devconf.force_mld_version,
6628 .maxlen = sizeof(int),
6629 .mode = 0644,
6630 .proc_handler = proc_dointvec,
6631 },
6632 {
6633 .procname = "mldv1_unsolicited_report_interval",
6634 .data =
6635 &ipv6_devconf.mldv1_unsolicited_report_interval,
6636 .maxlen = sizeof(int),
6637 .mode = 0644,
6638 .proc_handler = proc_dointvec_ms_jiffies,
6639 },
6640 {
6641 .procname = "mldv2_unsolicited_report_interval",
6642 .data =
6643 &ipv6_devconf.mldv2_unsolicited_report_interval,
6644 .maxlen = sizeof(int),
6645 .mode = 0644,
6646 .proc_handler = proc_dointvec_ms_jiffies,
6647 },
6648 {
6649 .procname = "use_tempaddr",
6650 .data = &ipv6_devconf.use_tempaddr,
6651 .maxlen = sizeof(int),
6652 .mode = 0644,
6653 .proc_handler = proc_dointvec,
6654 },
6655 {
6656 .procname = "temp_valid_lft",
6657 .data = &ipv6_devconf.temp_valid_lft,
6658 .maxlen = sizeof(int),
6659 .mode = 0644,
6660 .proc_handler = proc_dointvec,
6661 },
6662 {
6663 .procname = "temp_prefered_lft",
6664 .data = &ipv6_devconf.temp_prefered_lft,
6665 .maxlen = sizeof(int),
6666 .mode = 0644,
6667 .proc_handler = proc_dointvec,
6668 },
6669 {
6670 .procname = "regen_max_retry",
6671 .data = &ipv6_devconf.regen_max_retry,
6672 .maxlen = sizeof(int),
6673 .mode = 0644,
6674 .proc_handler = proc_dointvec,
6675 },
6676 {
6677 .procname = "max_desync_factor",
6678 .data = &ipv6_devconf.max_desync_factor,
6679 .maxlen = sizeof(int),
6680 .mode = 0644,
6681 .proc_handler = proc_dointvec,
6682 },
6683 {
6684 .procname = "max_addresses",
6685 .data = &ipv6_devconf.max_addresses,
6686 .maxlen = sizeof(int),
6687 .mode = 0644,
6688 .proc_handler = proc_dointvec,
6689 },
6690 {
6691 .procname = "accept_ra_defrtr",
6692 .data = &ipv6_devconf.accept_ra_defrtr,
6693 .maxlen = sizeof(int),
6694 .mode = 0644,
6695 .proc_handler = proc_dointvec,
6696 },
6b2e04bc
PC		 6697 {
6698 .procname = "ra_defrtr_metric",
6699 .data = &ipv6_devconf.ra_defrtr_metric,
6700 .maxlen = sizeof(u32),
6701 .mode = 0644,
6702 .proc_handler = proc_douintvec_minmax,
6703 .extra1 = (void *)SYSCTL_ONE,
6704 },
5df1f77f
KK		 6705 {
6706 .procname = "accept_ra_min_hop_limit",
6707 .data = &ipv6_devconf.accept_ra_min_hop_limit,
6708 .maxlen = sizeof(int),
6709 .mode = 0644,
6710 .proc_handler = proc_dointvec,
6711 },
6712 {
6713 .procname = "accept_ra_pinfo",
6714 .data = &ipv6_devconf.accept_ra_pinfo,
6715 .maxlen = sizeof(int),
6716 .mode = 0644,
6717 .proc_handler = proc_dointvec,
6718 },
930d6ff2 6719#ifdef CONFIG_IPV6_ROUTER_PREF
5df1f77f
KK		 6720 {
6721 .procname = "accept_ra_rtr_pref",
6722 .data = &ipv6_devconf.accept_ra_rtr_pref,
6723 .maxlen = sizeof(int),
6724 .mode = 0644,
6725 .proc_handler = proc_dointvec,
6726 },
6727 {
6728 .procname = "router_probe_interval",
6729 .data = &ipv6_devconf.rtr_probe_interval,
6730 .maxlen = sizeof(int),
6731 .mode = 0644,
6732 .proc_handler = proc_dointvec_jiffies,
6733 },
fa03ef38 6734#ifdef CONFIG_IPV6_ROUTE_INFO
bbea124b
JS		 6735 {
6736 .procname = "accept_ra_rt_info_min_plen",
6737 .data = &ipv6_devconf.accept_ra_rt_info_min_plen,
6738 .maxlen = sizeof(int),
6739 .mode = 0644,
6740 .proc_handler = proc_dointvec,
6741 },
5df1f77f
KK		 6742 {
6743 .procname = "accept_ra_rt_info_max_plen",
6744 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
6745 .maxlen = sizeof(int),
6746 .mode = 0644,
6747 .proc_handler = proc_dointvec,
6748 },
09c884d4 6749#endif
930d6ff2 6750#endif
5df1f77f
KK		 6751 {
6752 .procname = "proxy_ndp",
6753 .data = &ipv6_devconf.proxy_ndp,
6754 .maxlen = sizeof(int),
6755 .mode = 0644,
6756 .proc_handler = addrconf_sysctl_proxy_ndp,
6757 },
6758 {
6759 .procname = "accept_source_route",
6760 .data = &ipv6_devconf.accept_source_route,
6761 .maxlen = sizeof(int),
6762 .mode = 0644,
6763 .proc_handler = proc_dointvec,
6764 },
95c385b4 6765#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
5df1f77f
KK		 6766 {
6767 .procname = "optimistic_dad",
6768 .data = &ipv6_devconf.optimistic_dad,
6769 .maxlen = sizeof(int),
6770 .mode = 0644,
6771 .proc_handler = proc_dointvec,
6772 },
6773 {
6774 .procname = "use_optimistic",
6775 .data = &ipv6_devconf.use_optimistic,
6776 .maxlen = sizeof(int),
6777 .mode = 0644,
6778 .proc_handler = proc_dointvec,
6779 },
7bc570c8
YH		 6780#endif
6781#ifdef CONFIG_IPV6_MROUTE
5df1f77f
KK		 6782 {
6783 .procname = "mc_forwarding",
6784 .data = &ipv6_devconf.mc_forwarding,
6785 .maxlen = sizeof(int),
6786 .mode = 0444,
6787 .proc_handler = proc_dointvec,
6788 },
95c385b4 6789#endif
5df1f77f
KK		 6790 {
6791 .procname = "disable_ipv6",
6792 .data = &ipv6_devconf.disable_ipv6,
6793 .maxlen = sizeof(int),
6794 .mode = 0644,
6795 .proc_handler = addrconf_sysctl_disable,
6796 },
6797 {
6798 .procname = "accept_dad",
6799 .data = &ipv6_devconf.accept_dad,
6800 .maxlen = sizeof(int),
6801 .mode = 0644,
6802 .proc_handler = proc_dointvec,
6803 },
6804 {
6805 .procname = "force_tllao",
6806 .data = &ipv6_devconf.force_tllao,
6807 .maxlen = sizeof(int),
6808 .mode = 0644,
6809 .proc_handler = proc_dointvec
6810 },
6811 {
6812 .procname = "ndisc_notify",
6813 .data = &ipv6_devconf.ndisc_notify,
6814 .maxlen = sizeof(int),
6815 .mode = 0644,
6816 .proc_handler = proc_dointvec
6817 },
6818 {
6819 .procname = "suppress_frag_ndisc",
6820 .data = &ipv6_devconf.suppress_frag_ndisc,
6821 .maxlen = sizeof(int),
6822 .mode = 0644,
6823 .proc_handler = proc_dointvec
6824 },
6825 {
6826 .procname = "accept_ra_from_local",
6827 .data = &ipv6_devconf.accept_ra_from_local,
6828 .maxlen = sizeof(int),
6829 .mode = 0644,
6830 .proc_handler = proc_dointvec,
6831 },
6832 {
6833 .procname = "accept_ra_mtu",
6834 .data = &ipv6_devconf.accept_ra_mtu,
6835 .maxlen = sizeof(int),
6836 .mode = 0644,
6837 .proc_handler = proc_dointvec,
6838 },
6839 {
6840 .procname = "stable_secret",
6841 .data = &ipv6_devconf.stable_secret,
6842 .maxlen = IPV6_MAX_STRLEN,
6843 .mode = 0600,
6844 .proc_handler = addrconf_sysctl_stable_secret,
6845 },
6846 {
6847 .procname = "use_oif_addrs_only",
6848 .data = &ipv6_devconf.use_oif_addrs_only,
6849 .maxlen = sizeof(int),
6850 .mode = 0644,
6851 .proc_handler = proc_dointvec,
6852 },
6853 {
6854 .procname = "ignore_routes_with_linkdown",
6855 .data = &ipv6_devconf.ignore_routes_with_linkdown,
6856 .maxlen = sizeof(int),
6857 .mode = 0644,
6858 .proc_handler = addrconf_sysctl_ignore_routes_with_linkdown,
6859 },
6860 {
6861 .procname = "drop_unicast_in_l2_multicast",
6862 .data = &ipv6_devconf.drop_unicast_in_l2_multicast,
6863 .maxlen = sizeof(int),
6864 .mode = 0644,
6865 .proc_handler = proc_dointvec,
6866 },
6867 {
6868 .procname = "drop_unsolicited_na",
6869 .data = &ipv6_devconf.drop_unsolicited_na,
6870 .maxlen = sizeof(int),
6871 .mode = 0644,
6872 .proc_handler = proc_dointvec,
6873 },
6874 {
6875 .procname = "keep_addr_on_down",
6876 .data = &ipv6_devconf.keep_addr_on_down,
6877 .maxlen = sizeof(int),
6878 .mode = 0644,
6879 .proc_handler = proc_dointvec,
6880
6881 },
1ababeba
DL		 6882 {
6883 .procname = "seg6_enabled",
6884 .data = &ipv6_devconf.seg6_enabled,
6885 .maxlen = sizeof(int),
6886 .mode = 0644,
6887 .proc_handler = proc_dointvec,
6888 },
bf355b8d
DL		 6889#ifdef CONFIG_IPV6_SEG6_HMAC
6890 {
6891 .procname = "seg6_require_hmac",
6892 .data = &ipv6_devconf.seg6_require_hmac,
6893 .maxlen = sizeof(int),
6894 .mode = 0644,
6895 .proc_handler = proc_dointvec,
6896 },
6897#endif
adc176c5
EN		 6898 {
6899 .procname = "enhanced_dad",
6900 .data = &ipv6_devconf.enhanced_dad,
6901 .maxlen = sizeof(int),
6902 .mode = 0644,
6903 .proc_handler = proc_dointvec,
6904 },
d35a00b8
FJ		 6905 {
6906 .procname = "addr_gen_mode",
6907 .data = &ipv6_devconf.addr_gen_mode,
6908 .maxlen = sizeof(int),
6909 .mode = 0644,
6910 .proc_handler = addrconf_sysctl_addr_gen_mode,
6911 },
df789fe7
DF		 6912 {
6913 .procname = "disable_policy",
6914 .data = &ipv6_devconf.disable_policy,
6915 .maxlen = sizeof(int),
6916 .mode = 0644,
6917 .proc_handler = addrconf_sysctl_disable_policy,
6918 },
2210d6b2
MŻ		 6919 {
6920 .procname = "ndisc_tclass",
6921 .data = &ipv6_devconf.ndisc_tclass,
6922 .maxlen = sizeof(int),
6923 .mode = 0644,
6924 .proc_handler = proc_dointvec_minmax,
eec4844f 6925 .extra1 = (void *)SYSCTL_ZERO,
2210d6b2
MŻ		 6926 .extra2 = (void *)&two_five_five,
6927 },
8610c7c6
AA		 6928 {
6929 .procname = "rpl_seg_enabled",
6930 .data = &ipv6_devconf.rpl_seg_enabled,
6931 .maxlen = sizeof(int),
6932 .mode = 0644,
6933 .proc_handler = proc_dointvec,
6934 },
5df1f77f
KK		 6935 {
6936 /* sentinel */
6937 }
1da177e4
LT		 6938};
6939
bff16c2f 6940static int __addrconf_sysctl_register(struct net *net, char *dev_name,
f8572d8f 6941 struct inet6_dev *idev, struct ipv6_devconf *p)
1da177e4 6942{
29c994e3 6943 int i, ifindex;
607ea7cd 6944 struct ctl_table *table;
6105e293 6945 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ];
1dab6222 6946
607ea7cd
KK		 6947 table = kmemdup(addrconf_sysctl, sizeof(addrconf_sysctl), GFP_KERNEL);
6948 if (!table)
f68635e6
PE		 6949 goto out;
6950
607ea7cd
KK		 6951 for (i = 0; table[i].data; i++) {
6952 table[i].data += (char *)p - (char *)&ipv6_devconf;
cb9e684e
MŻ		 6953 /* If one of these is already set, then it is not safe to
6954 * overwrite either of them: this makes proc_dointvec_minmax
6955 * usable.
6956 */
6957 if (!table[i].extra1 && !table[i].extra2) {
6958 table[i].extra1 = idev; /* embedded; no ref */
6959 table[i].extra2 = net;
6960 }
1da177e4 6961 }
1da177e4 6962
6105e293 6963 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name);
1da177e4 6964
607ea7cd
KK		 6965 p->sysctl_header = register_net_sysctl(net, path, table);
6966 if (!p->sysctl_header)
6105e293 6967 goto free;
f68635e6 6968
29c994e3
ND		 6969 if (!strcmp(dev_name, "all"))
6970 ifindex = NETCONFA_IFINDEX_ALL;
6971 else if (!strcmp(dev_name, "default"))
6972 ifindex = NETCONFA_IFINDEX_DEFAULT;
6973 else
6974 ifindex = idev->dev->ifindex;
85b3daad
DA		 6975 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, NETCONFA_ALL,
6976 ifindex, p);
95897312 6977 return 0;
1da177e4 6978
f68635e6 6979free:
607ea7cd 6980 kfree(table);
f68635e6 6981out:
95897312 6982 return -ENOBUFS;
1da177e4
LT		 6983}
6984
23452170
DA		 6985static void __addrconf_sysctl_unregister(struct net *net,
6986 struct ipv6_devconf *p, int ifindex)
408c4768 6987{
607ea7cd 6988 struct ctl_table *table;
408c4768 6989
607ea7cd 6990 if (!p->sysctl_header)
408c4768
PE		 6991 return;
6992
607ea7cd
KK		 6993 table = p->sysctl_header->ctl_table_arg;
6994 unregister_net_sysctl_table(p->sysctl_header);
6995 p->sysctl_header = NULL;
6996 kfree(table);
23452170
DA		 6997
6998 inet6_netconf_notify_devconf(net, RTM_DELNETCONF, 0, ifindex, NULL);
408c4768
PE		 6999}
7000
a317a2f1 7001static int addrconf_sysctl_register(struct inet6_dev *idev)
f52295a9 7002{
a317a2f1
WC		 7003 int err;
7004
7005 if (!sysctl_dev_name_is_allowed(idev->dev->name))
7006 return -EINVAL;
7007
7008 err = neigh_sysctl_register(idev->dev, idev->nd_parms,
7009 &ndisc_ifinfo_sysctl_change);
7010 if (err)
7011 return err;
7012 err = __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
7013 idev, &idev->cnf);
7014 if (err)
7015 neigh_sysctl_unregister(idev->nd_parms);
7016
7017 return err;
f52295a9
PE		 7018}
7019
408c4768 7020static void addrconf_sysctl_unregister(struct inet6_dev *idev)
1da177e4 7021{
23452170
DA		 7022 __addrconf_sysctl_unregister(dev_net(idev->dev), &idev->cnf,
7023 idev->dev->ifindex);
408c4768 7024 neigh_sysctl_unregister(idev->nd_parms);
1da177e4
LT		 7025}
7026
7027
7028#endif
7029
2c8c1e72 7030static int __net_init addrconf_init_net(struct net *net)
e0da5a48 7031{
a79ca223 7032 int err = -ENOMEM;
e0da5a48
PE		 7033 struct ipv6_devconf *all, *dflt;
7034
a79ca223 7035 all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL);
63159f29 7036 if (!all)
a79ca223 7037 goto err_alloc_all;
e0da5a48 7038
a79ca223 7039 dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
63159f29 7040 if (!dflt)
a79ca223 7041 goto err_alloc_dflt;
e0da5a48 7042
a154d5d8 7043 if (IS_ENABLED(CONFIG_SYSCTL) &&
9efd6a3c
ND		 7044 !net_eq(net, &init_net)) {
7045 switch (sysctl_devconf_inherit_init_net) {
7046 case 1: /* copy from init_net */
7047 memcpy(all, init_net.ipv6.devconf_all,
7048 sizeof(ipv6_devconf));
7049 memcpy(dflt, init_net.ipv6.devconf_dflt,
7050 sizeof(ipv6_devconf_dflt));
7051 break;
7052 case 3: /* copy from the current netns */
7053 memcpy(all, current->nsproxy->net_ns->ipv6.devconf_all,
7054 sizeof(ipv6_devconf));
7055 memcpy(dflt,
7056 current->nsproxy->net_ns->ipv6.devconf_dflt,
7057 sizeof(ipv6_devconf_dflt));
7058 break;
7059 case 0:
7060 case 2:
7061 /* use compiled values */
7062 break;
7063 }
856c395c
CW		 7064 }
7065
a79ca223
HZ		 7066 /* these will be inherited by all namespaces */
7067 dflt->autoconf = ipv6_defaults.autoconf;
7068 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
e0da5a48 7069
3d1bec99
HFS		 7070 dflt->stable_secret.initialized = false;
7071 all->stable_secret.initialized = false;
7072
e0da5a48
PE		 7073 net->ipv6.devconf_all = all;
7074 net->ipv6.devconf_dflt = dflt;
7075
7076#ifdef CONFIG_SYSCTL
f8572d8f 7077 err = __addrconf_sysctl_register(net, "all", NULL, all);
e0da5a48
PE		 7078 if (err < 0)
7079 goto err_reg_all;
7080
f8572d8f 7081 err = __addrconf_sysctl_register(net, "default", NULL, dflt);
e0da5a48
PE		 7082 if (err < 0)
7083 goto err_reg_dflt;
7084#endif
7085 return 0;
7086
7087#ifdef CONFIG_SYSCTL
7088err_reg_dflt:
23452170 7089 __addrconf_sysctl_unregister(net, all, NETCONFA_IFINDEX_ALL);
e0da5a48
PE		 7090err_reg_all:
7091 kfree(dflt);
7092#endif
7093err_alloc_dflt:
7094 kfree(all);
7095err_alloc_all:
7096 return err;
7097}
7098
2c8c1e72 7099static void __net_exit addrconf_exit_net(struct net *net)
e0da5a48
PE		 7100{
7101#ifdef CONFIG_SYSCTL
23452170
DA		 7102 __addrconf_sysctl_unregister(net, net->ipv6.devconf_dflt,
7103 NETCONFA_IFINDEX_DEFAULT);
7104 __addrconf_sysctl_unregister(net, net->ipv6.devconf_all,
7105 NETCONFA_IFINDEX_ALL);
e0da5a48 7106#endif
73cf0e92 7107 kfree(net->ipv6.devconf_dflt);
7108 kfree(net->ipv6.devconf_all);
e0da5a48
PE		 7109}
7110
7111static struct pernet_operations addrconf_ops = {
7112 .init = addrconf_init_net,
7113 .exit = addrconf_exit_net,
7114};
7115
207895fd 7116static struct rtnl_af_ops inet6_ops __read_mostly = {
b382b191
TG		 7117 .family = AF_INET6,
7118 .fill_link_af = inet6_fill_link_af,
7119 .get_link_af_size = inet6_get_link_af_size,
11b1f828 7120 .validate_link_af = inet6_validate_link_af,
f53adae4 7121 .set_link_af = inet6_set_link_af,
b382b191
TG		 7122};
7123
1da177e4
LT		 7124/*
7125 * Init / cleanup code
7126 */
7127
7128int __init addrconf_init(void)
7129{
a317a2f1 7130 struct inet6_dev *idev;
c2e21293 7131 int i, err;
2a8cc6c8 7132
e21e8467
SH		 7133 err = ipv6_addr_label_init();
7134 if (err < 0) {
f3213831
JP		 7135 pr_crit("%s: cannot initialize default policy table: %d\n",
7136 __func__, err);
2cc6d2bf 7137 goto out;
2a8cc6c8 7138 }
1da177e4 7139
2cc6d2bf
NH		 7140 err = register_pernet_subsys(&addrconf_ops);
7141 if (err < 0)
7142 goto out_addrlabel;
e0da5a48 7143
c15b1cca
HFS		 7144 addrconf_wq = create_workqueue("ipv6_addrconf");
7145 if (!addrconf_wq) {
7146 err = -ENOMEM;
7147 goto out_nowq;
7148 }
7149
1da177e4
LT		 7150 /* The addrconf netdev notifier requires that loopback_dev
7151 * has it's ipv6 private information allocated and setup
7152 * before it can bring up and give link-local addresses
7153 * to other devices which are up.
7154 *
7155 * Unfortunately, loopback_dev is not necessarily the first
7156 * entry in the global dev_base list of net devices. In fact,
7157 * it is likely to be the very last entry on that list.
7158 * So this causes the notifier registry below to try and
7159 * give link-local addresses to all devices besides loopback_dev
7160 * first, then loopback_dev, which cases all the non-loopback_dev
7161 * devices to fail to get a link-local address.
7162 *
7163 * So, as a temporary fix, allocate the ipv6 structure for
7164 * loopback_dev first by hand.
7165 * Longer term, all of the dependencies ipv6 has upon the loopback
7166 * device and it being up should be removed.
7167 */
7168 rtnl_lock();
a317a2f1 7169 idev = ipv6_add_dev(init_net.loopback_dev);
1da177e4 7170 rtnl_unlock();
a317a2f1
WC		 7171 if (IS_ERR(idev)) {
7172 err = PTR_ERR(idev);
e0da5a48 7173 goto errlo;
a317a2f1 7174 }
1da177e4 7175
2f460933
WC		 7176 ip6_route_init_special_entries();
7177
c2e21293 7178 for (i = 0; i < IN6_ADDR_HSIZE; i++)
7179 INIT_HLIST_HEAD(&inet6_addr_lst[i]);
7180
1da177e4
LT		 7181 register_netdevice_notifier(&ipv6_dev_notf);
7182
c15b1cca 7183 addrconf_verify();
c127ea2c 7184
3678a9d8 7185 rtnl_af_register(&inet6_ops);
b382b191 7186
16feebcf
FW		 7187 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETLINK,
7188 NULL, inet6_dump_ifinfo, 0);
c127ea2c
TG		 7189 if (err < 0)
7190 goto errout;
7191
16feebcf
FW		 7192 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_NEWADDR,
7193 inet6_rtm_newaddr, NULL, 0);
7194 if (err < 0)
7195 goto errout;
7196 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_DELADDR,
7197 inet6_rtm_deladdr, NULL, 0);
7198 if (err < 0)
7199 goto errout;
7200 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETADDR,
7201 inet6_rtm_getaddr, inet6_dump_ifaddr,
7202 RTNL_FLAG_DOIT_UNLOCKED);
7203 if (err < 0)
7204 goto errout;
7205 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETMULTICAST,
7206 NULL, inet6_dump_ifmcaddr, 0);
7207 if (err < 0)
7208 goto errout;
7209 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETANYCAST,
7210 NULL, inet6_dump_ifacaddr, 0);
7211 if (err < 0)
7212 goto errout;
7213 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETNETCONF,
7214 inet6_netconf_get_devconf,
7215 inet6_netconf_dump_devconf,
7216 RTNL_FLAG_DOIT_UNLOCKED);
7217 if (err < 0)
7218 goto errout;
a3fde2ad
FW		 7219 err = ipv6_addr_label_rtnl_register();
7220 if (err < 0)
7221 goto errout;
2a8cc6c8 7222
1da177e4 7223 return 0;
c127ea2c 7224errout:
16feebcf 7225 rtnl_unregister_all(PF_INET6);
b382b191 7226 rtnl_af_unregister(&inet6_ops);
c127ea2c 7227 unregister_netdevice_notifier(&ipv6_dev_notf);
e0da5a48 7228errlo:
c15b1cca
HFS		 7229 destroy_workqueue(addrconf_wq);
7230out_nowq:
e0da5a48 7231 unregister_pernet_subsys(&addrconf_ops);
2cc6d2bf
NH		 7232out_addrlabel:
7233 ipv6_addr_label_cleanup();
7234out:
c127ea2c 7235 return err;
1da177e4
LT		 7236}
7237
09f7709f 7238void addrconf_cleanup(void)
1da177e4 7239{
176c39af 7240 struct net_device *dev;
1da177e4
LT		 7241 int i;
7242
7243 unregister_netdevice_notifier(&ipv6_dev_notf);
e0da5a48 7244 unregister_pernet_subsys(&addrconf_ops);
2cc6d2bf 7245 ipv6_addr_label_cleanup();
1da177e4 7246
5c45121d 7247 rtnl_af_unregister(&inet6_ops);
1da177e4 7248
5c45121d 7249 rtnl_lock();
b382b191 7250
176c39af
DL		 7251 /* clean dev list */
7252 for_each_netdev(&init_net, dev) {
7253 if (__in6_dev_get(dev) == NULL)
7254 continue;
ae79dbf6 7255 addrconf_ifdown(dev, true);
176c39af 7256 }
ae79dbf6 7257 addrconf_ifdown(init_net.loopback_dev, true);
176c39af 7258
1da177e4
LT		 7259 /*
7260 * Check hash table.
7261 */
5c578aed 7262 spin_lock_bh(&addrconf_hash_lock);
c2e21293 7263 for (i = 0; i < IN6_ADDR_HSIZE; i++)
7264 WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
5c578aed 7265 spin_unlock_bh(&addrconf_hash_lock);
c15b1cca 7266 cancel_delayed_work(&addr_chk_work);
1da177e4 7267 rtnl_unlock();
c15b1cca
HFS		 7268
7269 destroy_workqueue(addrconf_wq);
1da177e4 7270}
Linux 6.x block layer and io_uring tree(s)