1 /* 2 * IPv6 Address [auto]configuration 3 * Linux INET6 implementation 4 * 5 * Authors: 6 * Pedro Roque <roque@di.fc.ul.pt> 7 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru> 8 * 9 * This program is free software; you can redistribute it and/or 10 * modify it under the terms of the GNU General Public License 11 * as published by the Free Software Foundation; either version 12 * 2 of the License, or (at your option) any later version. 13 */ 14 15 /* 16 * Changes: 17 * 18 * Janos Farkas : delete timer on ifdown 19 * <chexum@bankinf.banki.hu> 20 * Andi Kleen : kill double kfree on module 21 * unload. 22 * Maciej W. Rozycki : FDDI support 23 * sekiya@USAGI : Don't send too many RS 24 * packets. 25 * yoshfuji@USAGI : Fixed interval between DAD 26 * packets. 27 * YOSHIFUJI Hideaki @USAGI : improved accuracy of 28 * address validation timer. 29 * YOSHIFUJI Hideaki @USAGI : Privacy Extensions (RFC3041) 30 * support. 31 * Yuji SEKIYA @USAGI : Don't assign a same IPv6 32 * address on a same interface. 33 * YOSHIFUJI Hideaki @USAGI : ARCnet support 34 * YOSHIFUJI Hideaki @USAGI : convert /proc/net/if_inet6 to 35 * seq_file. 36 * YOSHIFUJI Hideaki @USAGI : improved source address 37 * selection; consider scope, 38 * status etc. 39 */ 40 41 #define pr_fmt(fmt) "IPv6: " fmt 42 43 #include <linux/errno.h> 44 #include <linux/types.h> 45 #include <linux/kernel.h> 46 #include <linux/socket.h> 47 #include <linux/sockios.h> 48 #include <linux/net.h> 49 #include <linux/inet.h> 50 #include <linux/in6.h> 51 #include <linux/netdevice.h> 52 #include <linux/if_addr.h> 53 #include <linux/if_arp.h> 54 #include <linux/if_arcnet.h> 55 #include <linux/if_infiniband.h> 56 #include <linux/route.h> 57 #include <linux/inetdevice.h> 58 #include <linux/init.h> 59 #include <linux/slab.h> 60 #ifdef CONFIG_SYSCTL 61 #include <linux/sysctl.h> 62 #endif 63 #include <linux/capability.h> 64 #include <linux/delay.h> 65 #include <linux/notifier.h> 66 #include <linux/string.h> 67 #include <linux/hash.h> 68 69 #include <net/net_namespace.h> 70 #include <net/sock.h> 71 #include <net/snmp.h> 72 73 #include <net/6lowpan.h> 74 #include <net/firewire.h> 75 #include <net/ipv6.h> 76 #include <net/protocol.h> 77 #include <net/ndisc.h> 78 #include <net/ip6_route.h> 79 #include <net/addrconf.h> 80 #include <net/tcp.h> 81 #include <net/ip.h> 82 #include <net/netlink.h> 83 #include <net/pkt_sched.h> 84 #include <net/l3mdev.h> 85 #include <linux/if_tunnel.h> 86 #include <linux/rtnetlink.h> 87 #include <linux/netconf.h> 88 #include <linux/random.h> 89 #include <linux/uaccess.h> 90 #include <asm/unaligned.h> 91 92 #include <linux/proc_fs.h> 93 #include <linux/seq_file.h> 94 #include <linux/export.h> 95 96 /* Set to 3 to get tracing... */ 97 #define ACONF_DEBUG 2 98 99 #if ACONF_DEBUG >= 3 100 #define ADBG(fmt, ...) printk(fmt, ##__VA_ARGS__) 101 #else 102 #define ADBG(fmt, ...) do { if (0) printk(fmt, ##__VA_ARGS__); } while (0) 103 #endif 104 105 #define INFINITY_LIFE_TIME 0xFFFFFFFF 106 107 #define IPV6_MAX_STRLEN \ 108 sizeof("ffff:ffff:ffff:ffff:ffff:ffff:255.255.255.255") 109 110 static inline u32 cstamp_delta(unsigned long cstamp) 111 { 112 return (cstamp - INITIAL_JIFFIES) * 100UL / HZ; 113 } 114 115 static inline s32 rfc3315_s14_backoff_init(s32 irt) 116 { 117 /* multiply 'initial retransmission time' by 0.9 .. 1.1 */ 118 u64 tmp = (900000 + prandom_u32() % 200001) * (u64)irt; 119 do_div(tmp, 1000000); 120 return (s32)tmp; 121 } 122 123 static inline s32 rfc3315_s14_backoff_update(s32 rt, s32 mrt) 124 { 125 /* multiply 'retransmission timeout' by 1.9 .. 2.1 */ 126 u64 tmp = (1900000 + prandom_u32() % 200001) * (u64)rt; 127 do_div(tmp, 1000000); 128 if ((s32)tmp > mrt) { 129 /* multiply 'maximum retransmission time' by 0.9 .. 1.1 */ 130 tmp = (900000 + prandom_u32() % 200001) * (u64)mrt; 131 do_div(tmp, 1000000); 132 } 133 return (s32)tmp; 134 } 135 136 #ifdef CONFIG_SYSCTL 137 static int addrconf_sysctl_register(struct inet6_dev *idev); 138 static void addrconf_sysctl_unregister(struct inet6_dev *idev); 139 #else 140 static inline int addrconf_sysctl_register(struct inet6_dev *idev) 141 { 142 return 0; 143 } 144 145 static inline void addrconf_sysctl_unregister(struct inet6_dev *idev) 146 { 147 } 148 #endif 149 150 static void ipv6_regen_rndid(struct inet6_dev *idev); 151 static void ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr); 152 153 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev); 154 static int ipv6_count_addresses(struct inet6_dev *idev); 155 static int ipv6_generate_stable_address(struct in6_addr *addr, 156 u8 dad_count, 157 const struct inet6_dev *idev); 158 159 /* 160 * Configured unicast address hash table 161 */ 162 static struct hlist_head inet6_addr_lst[IN6_ADDR_HSIZE]; 163 static DEFINE_SPINLOCK(addrconf_hash_lock); 164 165 static void addrconf_verify(void); 166 static void addrconf_verify_rtnl(void); 167 static void addrconf_verify_work(struct work_struct *); 168 169 static struct workqueue_struct *addrconf_wq; 170 static DECLARE_DELAYED_WORK(addr_chk_work, addrconf_verify_work); 171 172 static void addrconf_join_anycast(struct inet6_ifaddr *ifp); 173 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp); 174 175 static void addrconf_type_change(struct net_device *dev, 176 unsigned long event); 177 static int addrconf_ifdown(struct net_device *dev, int how); 178 179 static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx, 180 int plen, 181 const struct net_device *dev, 182 u32 flags, u32 noflags); 183 184 static void addrconf_dad_start(struct inet6_ifaddr *ifp); 185 static void addrconf_dad_work(struct work_struct *w); 186 static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id); 187 static void addrconf_dad_run(struct inet6_dev *idev); 188 static void addrconf_rs_timer(unsigned long data); 189 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa); 190 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa); 191 192 static void inet6_prefix_notify(int event, struct inet6_dev *idev, 193 struct prefix_info *pinfo); 194 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr, 195 struct net_device *dev); 196 197 static struct ipv6_devconf ipv6_devconf __read_mostly = { 198 .forwarding = 0, 199 .hop_limit = IPV6_DEFAULT_HOPLIMIT, 200 .mtu6 = IPV6_MIN_MTU, 201 .accept_ra = 1, 202 .accept_redirects = 1, 203 .autoconf = 1, 204 .force_mld_version = 0, 205 .mldv1_unsolicited_report_interval = 10 * HZ, 206 .mldv2_unsolicited_report_interval = HZ, 207 .dad_transmits = 1, 208 .rtr_solicits = MAX_RTR_SOLICITATIONS, 209 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL, 210 .rtr_solicit_max_interval = RTR_SOLICITATION_MAX_INTERVAL, 211 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY, 212 .use_tempaddr = 0, 213 .temp_valid_lft = TEMP_VALID_LIFETIME, 214 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME, 215 .regen_max_retry = REGEN_MAX_RETRY, 216 .max_desync_factor = MAX_DESYNC_FACTOR, 217 .max_addresses = IPV6_MAX_ADDRESSES, 218 .accept_ra_defrtr = 1, 219 .accept_ra_from_local = 0, 220 .accept_ra_min_hop_limit= 1, 221 .accept_ra_pinfo = 1, 222 #ifdef CONFIG_IPV6_ROUTER_PREF 223 .accept_ra_rtr_pref = 1, 224 .rtr_probe_interval = 60 * HZ, 225 #ifdef CONFIG_IPV6_ROUTE_INFO 226 .accept_ra_rt_info_max_plen = 0, 227 #endif 228 #endif 229 .proxy_ndp = 0, 230 .accept_source_route = 0, /* we do not accept RH0 by default. */ 231 .disable_ipv6 = 0, 232 .accept_dad = 1, 233 .suppress_frag_ndisc = 1, 234 .accept_ra_mtu = 1, 235 .stable_secret = { 236 .initialized = false, 237 }, 238 .use_oif_addrs_only = 0, 239 .ignore_routes_with_linkdown = 0, 240 .keep_addr_on_down = 0, 241 .seg6_enabled = 0, 242 #ifdef CONFIG_IPV6_SEG6_HMAC 243 .seg6_require_hmac = 0, 244 #endif 245 }; 246 247 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = { 248 .forwarding = 0, 249 .hop_limit = IPV6_DEFAULT_HOPLIMIT, 250 .mtu6 = IPV6_MIN_MTU, 251 .accept_ra = 1, 252 .accept_redirects = 1, 253 .autoconf = 1, 254 .force_mld_version = 0, 255 .mldv1_unsolicited_report_interval = 10 * HZ, 256 .mldv2_unsolicited_report_interval = HZ, 257 .dad_transmits = 1, 258 .rtr_solicits = MAX_RTR_SOLICITATIONS, 259 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL, 260 .rtr_solicit_max_interval = RTR_SOLICITATION_MAX_INTERVAL, 261 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY, 262 .use_tempaddr = 0, 263 .temp_valid_lft = TEMP_VALID_LIFETIME, 264 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME, 265 .regen_max_retry = REGEN_MAX_RETRY, 266 .max_desync_factor = MAX_DESYNC_FACTOR, 267 .max_addresses = IPV6_MAX_ADDRESSES, 268 .accept_ra_defrtr = 1, 269 .accept_ra_from_local = 0, 270 .accept_ra_min_hop_limit= 1, 271 .accept_ra_pinfo = 1, 272 #ifdef CONFIG_IPV6_ROUTER_PREF 273 .accept_ra_rtr_pref = 1, 274 .rtr_probe_interval = 60 * HZ, 275 #ifdef CONFIG_IPV6_ROUTE_INFO 276 .accept_ra_rt_info_max_plen = 0, 277 #endif 278 #endif 279 .proxy_ndp = 0, 280 .accept_source_route = 0, /* we do not accept RH0 by default. */ 281 .disable_ipv6 = 0, 282 .accept_dad = 1, 283 .suppress_frag_ndisc = 1, 284 .accept_ra_mtu = 1, 285 .stable_secret = { 286 .initialized = false, 287 }, 288 .use_oif_addrs_only = 0, 289 .ignore_routes_with_linkdown = 0, 290 .keep_addr_on_down = 0, 291 .seg6_enabled = 0, 292 #ifdef CONFIG_IPV6_SEG6_HMAC 293 .seg6_require_hmac = 0, 294 #endif 295 }; 296 297 /* Check if a valid qdisc is available */ 298 static inline bool addrconf_qdisc_ok(const struct net_device *dev) 299 { 300 return !qdisc_tx_is_noop(dev); 301 } 302 303 static void addrconf_del_rs_timer(struct inet6_dev *idev) 304 { 305 if (del_timer(&idev->rs_timer)) 306 __in6_dev_put(idev); 307 } 308 309 static void addrconf_del_dad_work(struct inet6_ifaddr *ifp) 310 { 311 if (cancel_delayed_work(&ifp->dad_work)) 312 __in6_ifa_put(ifp); 313 } 314 315 static void addrconf_mod_rs_timer(struct inet6_dev *idev, 316 unsigned long when) 317 { 318 if (!timer_pending(&idev->rs_timer)) 319 in6_dev_hold(idev); 320 mod_timer(&idev->rs_timer, jiffies + when); 321 } 322 323 static void addrconf_mod_dad_work(struct inet6_ifaddr *ifp, 324 unsigned long delay) 325 { 326 if (!delayed_work_pending(&ifp->dad_work)) 327 in6_ifa_hold(ifp); 328 mod_delayed_work(addrconf_wq, &ifp->dad_work, delay); 329 } 330 331 static int snmp6_alloc_dev(struct inet6_dev *idev) 332 { 333 int i; 334 335 idev->stats.ipv6 = alloc_percpu(struct ipstats_mib); 336 if (!idev->stats.ipv6) 337 goto err_ip; 338 339 for_each_possible_cpu(i) { 340 struct ipstats_mib *addrconf_stats; 341 addrconf_stats = per_cpu_ptr(idev->stats.ipv6, i); 342 u64_stats_init(&addrconf_stats->syncp); 343 } 344 345 346 idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device), 347 GFP_KERNEL); 348 if (!idev->stats.icmpv6dev) 349 goto err_icmp; 350 idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device), 351 GFP_KERNEL); 352 if (!idev->stats.icmpv6msgdev) 353 goto err_icmpmsg; 354 355 return 0; 356 357 err_icmpmsg: 358 kfree(idev->stats.icmpv6dev); 359 err_icmp: 360 free_percpu(idev->stats.ipv6); 361 err_ip: 362 return -ENOMEM; 363 } 364 365 static struct inet6_dev *ipv6_add_dev(struct net_device *dev) 366 { 367 struct inet6_dev *ndev; 368 int err = -ENOMEM; 369 370 ASSERT_RTNL(); 371 372 if (dev->mtu < IPV6_MIN_MTU) 373 return ERR_PTR(-EINVAL); 374 375 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL); 376 if (!ndev) 377 return ERR_PTR(err); 378 379 rwlock_init(&ndev->lock); 380 ndev->dev = dev; 381 INIT_LIST_HEAD(&ndev->addr_list); 382 setup_timer(&ndev->rs_timer, addrconf_rs_timer, 383 (unsigned long)ndev); 384 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf)); 385 386 if (ndev->cnf.stable_secret.initialized) 387 ndev->addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY; 388 else 389 ndev->addr_gen_mode = IN6_ADDR_GEN_MODE_EUI64; 390 391 ndev->cnf.mtu6 = dev->mtu; 392 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl); 393 if (!ndev->nd_parms) { 394 kfree(ndev); 395 return ERR_PTR(err); 396 } 397 if (ndev->cnf.forwarding) 398 dev_disable_lro(dev); 399 /* We refer to the device */ 400 dev_hold(dev); 401 402 if (snmp6_alloc_dev(ndev) < 0) { 403 ADBG(KERN_WARNING 404 "%s: cannot allocate memory for statistics; dev=%s.\n", 405 __func__, dev->name); 406 neigh_parms_release(&nd_tbl, ndev->nd_parms); 407 dev_put(dev); 408 kfree(ndev); 409 return ERR_PTR(err); 410 } 411 412 if (snmp6_register_dev(ndev) < 0) { 413 ADBG(KERN_WARNING 414 "%s: cannot create /proc/net/dev_snmp6/%s\n", 415 __func__, dev->name); 416 goto err_release; 417 } 418 419 /* One reference from device. */ 420 in6_dev_hold(ndev); 421 422 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK)) 423 ndev->cnf.accept_dad = -1; 424 425 #if IS_ENABLED(CONFIG_IPV6_SIT) 426 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) { 427 pr_info("%s: Disabled Multicast RS\n", dev->name); 428 ndev->cnf.rtr_solicits = 0; 429 } 430 #endif 431 432 INIT_LIST_HEAD(&ndev->tempaddr_list); 433 ndev->desync_factor = U32_MAX; 434 if ((dev->flags&IFF_LOOPBACK) || 435 dev->type == ARPHRD_TUNNEL || 436 dev->type == ARPHRD_TUNNEL6 || 437 dev->type == ARPHRD_SIT || 438 dev->type == ARPHRD_NONE) { 439 ndev->cnf.use_tempaddr = -1; 440 } else 441 ipv6_regen_rndid(ndev); 442 443 ndev->token = in6addr_any; 444 445 if (netif_running(dev) && addrconf_qdisc_ok(dev)) 446 ndev->if_flags |= IF_READY; 447 448 ipv6_mc_init_dev(ndev); 449 ndev->tstamp = jiffies; 450 err = addrconf_sysctl_register(ndev); 451 if (err) { 452 ipv6_mc_destroy_dev(ndev); 453 snmp6_unregister_dev(ndev); 454 goto err_release; 455 } 456 /* protected by rtnl_lock */ 457 rcu_assign_pointer(dev->ip6_ptr, ndev); 458 459 /* Join interface-local all-node multicast group */ 460 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allnodes); 461 462 /* Join all-node multicast group */ 463 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes); 464 465 /* Join all-router multicast group if forwarding is set */ 466 if (ndev->cnf.forwarding && (dev->flags & IFF_MULTICAST)) 467 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters); 468 469 return ndev; 470 471 err_release: 472 neigh_parms_release(&nd_tbl, ndev->nd_parms); 473 ndev->dead = 1; 474 in6_dev_finish_destroy(ndev); 475 return ERR_PTR(err); 476 } 477 478 static struct inet6_dev *ipv6_find_idev(struct net_device *dev) 479 { 480 struct inet6_dev *idev; 481 482 ASSERT_RTNL(); 483 484 idev = __in6_dev_get(dev); 485 if (!idev) { 486 idev = ipv6_add_dev(dev); 487 if (IS_ERR(idev)) 488 return NULL; 489 } 490 491 if (dev->flags&IFF_UP) 492 ipv6_mc_up(idev); 493 return idev; 494 } 495 496 static int inet6_netconf_msgsize_devconf(int type) 497 { 498 int size = NLMSG_ALIGN(sizeof(struct netconfmsg)) 499 + nla_total_size(4); /* NETCONFA_IFINDEX */ 500 bool all = false; 501 502 if (type == NETCONFA_ALL) 503 all = true; 504 505 if (all || type == NETCONFA_FORWARDING) 506 size += nla_total_size(4); 507 #ifdef CONFIG_IPV6_MROUTE 508 if (all || type == NETCONFA_MC_FORWARDING) 509 size += nla_total_size(4); 510 #endif 511 if (all || type == NETCONFA_PROXY_NEIGH) 512 size += nla_total_size(4); 513 514 if (all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN) 515 size += nla_total_size(4); 516 517 return size; 518 } 519 520 static int inet6_netconf_fill_devconf(struct sk_buff *skb, int ifindex, 521 struct ipv6_devconf *devconf, u32 portid, 522 u32 seq, int event, unsigned int flags, 523 int type) 524 { 525 struct nlmsghdr *nlh; 526 struct netconfmsg *ncm; 527 bool all = false; 528 529 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg), 530 flags); 531 if (!nlh) 532 return -EMSGSIZE; 533 534 if (type == NETCONFA_ALL) 535 all = true; 536 537 ncm = nlmsg_data(nlh); 538 ncm->ncm_family = AF_INET6; 539 540 if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0) 541 goto nla_put_failure; 542 543 if ((all || type == NETCONFA_FORWARDING) && 544 nla_put_s32(skb, NETCONFA_FORWARDING, devconf->forwarding) < 0) 545 goto nla_put_failure; 546 #ifdef CONFIG_IPV6_MROUTE 547 if ((all || type == NETCONFA_MC_FORWARDING) && 548 nla_put_s32(skb, NETCONFA_MC_FORWARDING, 549 devconf->mc_forwarding) < 0) 550 goto nla_put_failure; 551 #endif 552 if ((all || type == NETCONFA_PROXY_NEIGH) && 553 nla_put_s32(skb, NETCONFA_PROXY_NEIGH, devconf->proxy_ndp) < 0) 554 goto nla_put_failure; 555 556 if ((all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN) && 557 nla_put_s32(skb, NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN, 558 devconf->ignore_routes_with_linkdown) < 0) 559 goto nla_put_failure; 560 561 nlmsg_end(skb, nlh); 562 return 0; 563 564 nla_put_failure: 565 nlmsg_cancel(skb, nlh); 566 return -EMSGSIZE; 567 } 568 569 void inet6_netconf_notify_devconf(struct net *net, int type, int ifindex, 570 struct ipv6_devconf *devconf) 571 { 572 struct sk_buff *skb; 573 int err = -ENOBUFS; 574 575 skb = nlmsg_new(inet6_netconf_msgsize_devconf(type), GFP_KERNEL); 576 if (!skb) 577 goto errout; 578 579 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 0, 0, 580 RTM_NEWNETCONF, 0, type); 581 if (err < 0) { 582 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */ 583 WARN_ON(err == -EMSGSIZE); 584 kfree_skb(skb); 585 goto errout; 586 } 587 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_NETCONF, NULL, GFP_KERNEL); 588 return; 589 errout: 590 rtnl_set_sk_err(net, RTNLGRP_IPV6_NETCONF, err); 591 } 592 593 static const struct nla_policy devconf_ipv6_policy[NETCONFA_MAX+1] = { 594 [NETCONFA_IFINDEX] = { .len = sizeof(int) }, 595 [NETCONFA_FORWARDING] = { .len = sizeof(int) }, 596 [NETCONFA_PROXY_NEIGH] = { .len = sizeof(int) }, 597 [NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN] = { .len = sizeof(int) }, 598 }; 599 600 static int inet6_netconf_get_devconf(struct sk_buff *in_skb, 601 struct nlmsghdr *nlh) 602 { 603 struct net *net = sock_net(in_skb->sk); 604 struct nlattr *tb[NETCONFA_MAX+1]; 605 struct netconfmsg *ncm; 606 struct sk_buff *skb; 607 struct ipv6_devconf *devconf; 608 struct inet6_dev *in6_dev; 609 struct net_device *dev; 610 int ifindex; 611 int err; 612 613 err = nlmsg_parse(nlh, sizeof(*ncm), tb, NETCONFA_MAX, 614 devconf_ipv6_policy); 615 if (err < 0) 616 goto errout; 617 618 err = -EINVAL; 619 if (!tb[NETCONFA_IFINDEX]) 620 goto errout; 621 622 ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]); 623 switch (ifindex) { 624 case NETCONFA_IFINDEX_ALL: 625 devconf = net->ipv6.devconf_all; 626 break; 627 case NETCONFA_IFINDEX_DEFAULT: 628 devconf = net->ipv6.devconf_dflt; 629 break; 630 default: 631 dev = __dev_get_by_index(net, ifindex); 632 if (!dev) 633 goto errout; 634 in6_dev = __in6_dev_get(dev); 635 if (!in6_dev) 636 goto errout; 637 devconf = &in6_dev->cnf; 638 break; 639 } 640 641 err = -ENOBUFS; 642 skb = nlmsg_new(inet6_netconf_msgsize_devconf(NETCONFA_ALL), GFP_ATOMIC); 643 if (!skb) 644 goto errout; 645 646 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 647 NETLINK_CB(in_skb).portid, 648 nlh->nlmsg_seq, RTM_NEWNETCONF, 0, 649 NETCONFA_ALL); 650 if (err < 0) { 651 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */ 652 WARN_ON(err == -EMSGSIZE); 653 kfree_skb(skb); 654 goto errout; 655 } 656 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid); 657 errout: 658 return err; 659 } 660 661 static int inet6_netconf_dump_devconf(struct sk_buff *skb, 662 struct netlink_callback *cb) 663 { 664 struct net *net = sock_net(skb->sk); 665 int h, s_h; 666 int idx, s_idx; 667 struct net_device *dev; 668 struct inet6_dev *idev; 669 struct hlist_head *head; 670 671 s_h = cb->args[0]; 672 s_idx = idx = cb->args[1]; 673 674 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 675 idx = 0; 676 head = &net->dev_index_head[h]; 677 rcu_read_lock(); 678 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ 679 net->dev_base_seq; 680 hlist_for_each_entry_rcu(dev, head, index_hlist) { 681 if (idx < s_idx) 682 goto cont; 683 idev = __in6_dev_get(dev); 684 if (!idev) 685 goto cont; 686 687 if (inet6_netconf_fill_devconf(skb, dev->ifindex, 688 &idev->cnf, 689 NETLINK_CB(cb->skb).portid, 690 cb->nlh->nlmsg_seq, 691 RTM_NEWNETCONF, 692 NLM_F_MULTI, 693 NETCONFA_ALL) < 0) { 694 rcu_read_unlock(); 695 goto done; 696 } 697 nl_dump_check_consistent(cb, nlmsg_hdr(skb)); 698 cont: 699 idx++; 700 } 701 rcu_read_unlock(); 702 } 703 if (h == NETDEV_HASHENTRIES) { 704 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL, 705 net->ipv6.devconf_all, 706 NETLINK_CB(cb->skb).portid, 707 cb->nlh->nlmsg_seq, 708 RTM_NEWNETCONF, NLM_F_MULTI, 709 NETCONFA_ALL) < 0) 710 goto done; 711 else 712 h++; 713 } 714 if (h == NETDEV_HASHENTRIES + 1) { 715 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT, 716 net->ipv6.devconf_dflt, 717 NETLINK_CB(cb->skb).portid, 718 cb->nlh->nlmsg_seq, 719 RTM_NEWNETCONF, NLM_F_MULTI, 720 NETCONFA_ALL) < 0) 721 goto done; 722 else 723 h++; 724 } 725 done: 726 cb->args[0] = h; 727 cb->args[1] = idx; 728 729 return skb->len; 730 } 731 732 #ifdef CONFIG_SYSCTL 733 static void dev_forward_change(struct inet6_dev *idev) 734 { 735 struct net_device *dev; 736 struct inet6_ifaddr *ifa; 737 738 if (!idev) 739 return; 740 dev = idev->dev; 741 if (idev->cnf.forwarding) 742 dev_disable_lro(dev); 743 if (dev->flags & IFF_MULTICAST) { 744 if (idev->cnf.forwarding) { 745 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters); 746 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allrouters); 747 ipv6_dev_mc_inc(dev, &in6addr_sitelocal_allrouters); 748 } else { 749 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters); 750 ipv6_dev_mc_dec(dev, &in6addr_interfacelocal_allrouters); 751 ipv6_dev_mc_dec(dev, &in6addr_sitelocal_allrouters); 752 } 753 } 754 755 list_for_each_entry(ifa, &idev->addr_list, if_list) { 756 if (ifa->flags&IFA_F_TENTATIVE) 757 continue; 758 if (idev->cnf.forwarding) 759 addrconf_join_anycast(ifa); 760 else 761 addrconf_leave_anycast(ifa); 762 } 763 inet6_netconf_notify_devconf(dev_net(dev), NETCONFA_FORWARDING, 764 dev->ifindex, &idev->cnf); 765 } 766 767 768 static void addrconf_forward_change(struct net *net, __s32 newf) 769 { 770 struct net_device *dev; 771 struct inet6_dev *idev; 772 773 for_each_netdev(net, dev) { 774 idev = __in6_dev_get(dev); 775 if (idev) { 776 int changed = (!idev->cnf.forwarding) ^ (!newf); 777 idev->cnf.forwarding = newf; 778 if (changed) 779 dev_forward_change(idev); 780 } 781 } 782 } 783 784 static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf) 785 { 786 struct net *net; 787 int old; 788 789 if (!rtnl_trylock()) 790 return restart_syscall(); 791 792 net = (struct net *)table->extra2; 793 old = *p; 794 *p = newf; 795 796 if (p == &net->ipv6.devconf_dflt->forwarding) { 797 if ((!newf) ^ (!old)) 798 inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING, 799 NETCONFA_IFINDEX_DEFAULT, 800 net->ipv6.devconf_dflt); 801 rtnl_unlock(); 802 return 0; 803 } 804 805 if (p == &net->ipv6.devconf_all->forwarding) { 806 int old_dflt = net->ipv6.devconf_dflt->forwarding; 807 808 net->ipv6.devconf_dflt->forwarding = newf; 809 if ((!newf) ^ (!old_dflt)) 810 inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING, 811 NETCONFA_IFINDEX_DEFAULT, 812 net->ipv6.devconf_dflt); 813 814 addrconf_forward_change(net, newf); 815 if ((!newf) ^ (!old)) 816 inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING, 817 NETCONFA_IFINDEX_ALL, 818 net->ipv6.devconf_all); 819 } else if ((!newf) ^ (!old)) 820 dev_forward_change((struct inet6_dev *)table->extra1); 821 rtnl_unlock(); 822 823 if (newf) 824 rt6_purge_dflt_routers(net); 825 return 1; 826 } 827 828 static void addrconf_linkdown_change(struct net *net, __s32 newf) 829 { 830 struct net_device *dev; 831 struct inet6_dev *idev; 832 833 for_each_netdev(net, dev) { 834 idev = __in6_dev_get(dev); 835 if (idev) { 836 int changed = (!idev->cnf.ignore_routes_with_linkdown) ^ (!newf); 837 838 idev->cnf.ignore_routes_with_linkdown = newf; 839 if (changed) 840 inet6_netconf_notify_devconf(dev_net(dev), 841 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN, 842 dev->ifindex, 843 &idev->cnf); 844 } 845 } 846 } 847 848 static int addrconf_fixup_linkdown(struct ctl_table *table, int *p, int newf) 849 { 850 struct net *net; 851 int old; 852 853 if (!rtnl_trylock()) 854 return restart_syscall(); 855 856 net = (struct net *)table->extra2; 857 old = *p; 858 *p = newf; 859 860 if (p == &net->ipv6.devconf_dflt->ignore_routes_with_linkdown) { 861 if ((!newf) ^ (!old)) 862 inet6_netconf_notify_devconf(net, 863 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN, 864 NETCONFA_IFINDEX_DEFAULT, 865 net->ipv6.devconf_dflt); 866 rtnl_unlock(); 867 return 0; 868 } 869 870 if (p == &net->ipv6.devconf_all->ignore_routes_with_linkdown) { 871 net->ipv6.devconf_dflt->ignore_routes_with_linkdown = newf; 872 addrconf_linkdown_change(net, newf); 873 if ((!newf) ^ (!old)) 874 inet6_netconf_notify_devconf(net, 875 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN, 876 NETCONFA_IFINDEX_ALL, 877 net->ipv6.devconf_all); 878 } 879 rtnl_unlock(); 880 881 return 1; 882 } 883 884 #endif 885 886 /* Nobody refers to this ifaddr, destroy it */ 887 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp) 888 { 889 WARN_ON(!hlist_unhashed(&ifp->addr_lst)); 890 891 #ifdef NET_REFCNT_DEBUG 892 pr_debug("%s\n", __func__); 893 #endif 894 895 in6_dev_put(ifp->idev); 896 897 if (cancel_delayed_work(&ifp->dad_work)) 898 pr_notice("delayed DAD work was pending while freeing ifa=%p\n", 899 ifp); 900 901 if (ifp->state != INET6_IFADDR_STATE_DEAD) { 902 pr_warn("Freeing alive inet6 address %p\n", ifp); 903 return; 904 } 905 ip6_rt_put(ifp->rt); 906 907 kfree_rcu(ifp, rcu); 908 } 909 910 static void 911 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp) 912 { 913 struct list_head *p; 914 int ifp_scope = ipv6_addr_src_scope(&ifp->addr); 915 916 /* 917 * Each device address list is sorted in order of scope - 918 * global before linklocal. 919 */ 920 list_for_each(p, &idev->addr_list) { 921 struct inet6_ifaddr *ifa 922 = list_entry(p, struct inet6_ifaddr, if_list); 923 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr)) 924 break; 925 } 926 927 list_add_tail(&ifp->if_list, p); 928 } 929 930 static u32 inet6_addr_hash(const struct in6_addr *addr) 931 { 932 return hash_32(ipv6_addr_hash(addr), IN6_ADDR_HSIZE_SHIFT); 933 } 934 935 /* On success it returns ifp with increased reference count */ 936 937 static struct inet6_ifaddr * 938 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, 939 const struct in6_addr *peer_addr, int pfxlen, 940 int scope, u32 flags, u32 valid_lft, u32 prefered_lft) 941 { 942 struct inet6_ifaddr *ifa = NULL; 943 struct rt6_info *rt; 944 unsigned int hash; 945 int err = 0; 946 int addr_type = ipv6_addr_type(addr); 947 948 if (addr_type == IPV6_ADDR_ANY || 949 addr_type & IPV6_ADDR_MULTICAST || 950 (!(idev->dev->flags & IFF_LOOPBACK) && 951 addr_type & IPV6_ADDR_LOOPBACK)) 952 return ERR_PTR(-EADDRNOTAVAIL); 953 954 rcu_read_lock_bh(); 955 if (idev->dead) { 956 err = -ENODEV; /*XXX*/ 957 goto out2; 958 } 959 960 if (idev->cnf.disable_ipv6) { 961 err = -EACCES; 962 goto out2; 963 } 964 965 spin_lock(&addrconf_hash_lock); 966 967 /* Ignore adding duplicate addresses on an interface */ 968 if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) { 969 ADBG("ipv6_add_addr: already assigned\n"); 970 err = -EEXIST; 971 goto out; 972 } 973 974 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC); 975 976 if (!ifa) { 977 ADBG("ipv6_add_addr: malloc failed\n"); 978 err = -ENOBUFS; 979 goto out; 980 } 981 982 rt = addrconf_dst_alloc(idev, addr, false); 983 if (IS_ERR(rt)) { 984 err = PTR_ERR(rt); 985 goto out; 986 } 987 988 neigh_parms_data_state_setall(idev->nd_parms); 989 990 ifa->addr = *addr; 991 if (peer_addr) 992 ifa->peer_addr = *peer_addr; 993 994 spin_lock_init(&ifa->lock); 995 INIT_DELAYED_WORK(&ifa->dad_work, addrconf_dad_work); 996 INIT_HLIST_NODE(&ifa->addr_lst); 997 ifa->scope = scope; 998 ifa->prefix_len = pfxlen; 999 ifa->flags = flags | IFA_F_TENTATIVE; 1000 ifa->valid_lft = valid_lft; 1001 ifa->prefered_lft = prefered_lft; 1002 ifa->cstamp = ifa->tstamp = jiffies; 1003 ifa->tokenized = false; 1004 1005 ifa->rt = rt; 1006 1007 ifa->idev = idev; 1008 in6_dev_hold(idev); 1009 /* For caller */ 1010 in6_ifa_hold(ifa); 1011 1012 /* Add to big hash table */ 1013 hash = inet6_addr_hash(addr); 1014 1015 hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]); 1016 spin_unlock(&addrconf_hash_lock); 1017 1018 write_lock(&idev->lock); 1019 /* Add to inet6_dev unicast addr list. */ 1020 ipv6_link_dev_addr(idev, ifa); 1021 1022 if (ifa->flags&IFA_F_TEMPORARY) { 1023 list_add(&ifa->tmp_list, &idev->tempaddr_list); 1024 in6_ifa_hold(ifa); 1025 } 1026 1027 in6_ifa_hold(ifa); 1028 write_unlock(&idev->lock); 1029 out2: 1030 rcu_read_unlock_bh(); 1031 1032 if (likely(err == 0)) 1033 inet6addr_notifier_call_chain(NETDEV_UP, ifa); 1034 else { 1035 kfree(ifa); 1036 ifa = ERR_PTR(err); 1037 } 1038 1039 return ifa; 1040 out: 1041 spin_unlock(&addrconf_hash_lock); 1042 goto out2; 1043 } 1044 1045 enum cleanup_prefix_rt_t { 1046 CLEANUP_PREFIX_RT_NOP, /* no cleanup action for prefix route */ 1047 CLEANUP_PREFIX_RT_DEL, /* delete the prefix route */ 1048 CLEANUP_PREFIX_RT_EXPIRE, /* update the lifetime of the prefix route */ 1049 }; 1050 1051 /* 1052 * Check, whether the prefix for ifp would still need a prefix route 1053 * after deleting ifp. The function returns one of the CLEANUP_PREFIX_RT_* 1054 * constants. 1055 * 1056 * 1) we don't purge prefix if address was not permanent. 1057 * prefix is managed by its own lifetime. 1058 * 2) we also don't purge, if the address was IFA_F_NOPREFIXROUTE. 1059 * 3) if there are no addresses, delete prefix. 1060 * 4) if there are still other permanent address(es), 1061 * corresponding prefix is still permanent. 1062 * 5) if there are still other addresses with IFA_F_NOPREFIXROUTE, 1063 * don't purge the prefix, assume user space is managing it. 1064 * 6) otherwise, update prefix lifetime to the 1065 * longest valid lifetime among the corresponding 1066 * addresses on the device. 1067 * Note: subsequent RA will update lifetime. 1068 **/ 1069 static enum cleanup_prefix_rt_t 1070 check_cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long *expires) 1071 { 1072 struct inet6_ifaddr *ifa; 1073 struct inet6_dev *idev = ifp->idev; 1074 unsigned long lifetime; 1075 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_DEL; 1076 1077 *expires = jiffies; 1078 1079 list_for_each_entry(ifa, &idev->addr_list, if_list) { 1080 if (ifa == ifp) 1081 continue; 1082 if (!ipv6_prefix_equal(&ifa->addr, &ifp->addr, 1083 ifp->prefix_len)) 1084 continue; 1085 if (ifa->flags & (IFA_F_PERMANENT | IFA_F_NOPREFIXROUTE)) 1086 return CLEANUP_PREFIX_RT_NOP; 1087 1088 action = CLEANUP_PREFIX_RT_EXPIRE; 1089 1090 spin_lock(&ifa->lock); 1091 1092 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ); 1093 /* 1094 * Note: Because this address is 1095 * not permanent, lifetime < 1096 * LONG_MAX / HZ here. 1097 */ 1098 if (time_before(*expires, ifa->tstamp + lifetime * HZ)) 1099 *expires = ifa->tstamp + lifetime * HZ; 1100 spin_unlock(&ifa->lock); 1101 } 1102 1103 return action; 1104 } 1105 1106 static void 1107 cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long expires, bool del_rt) 1108 { 1109 struct rt6_info *rt; 1110 1111 rt = addrconf_get_prefix_route(&ifp->addr, 1112 ifp->prefix_len, 1113 ifp->idev->dev, 1114 0, RTF_GATEWAY | RTF_DEFAULT); 1115 if (rt) { 1116 if (del_rt) 1117 ip6_del_rt(rt); 1118 else { 1119 if (!(rt->rt6i_flags & RTF_EXPIRES)) 1120 rt6_set_expires(rt, expires); 1121 ip6_rt_put(rt); 1122 } 1123 } 1124 } 1125 1126 1127 /* This function wants to get referenced ifp and releases it before return */ 1128 1129 static void ipv6_del_addr(struct inet6_ifaddr *ifp) 1130 { 1131 int state; 1132 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_NOP; 1133 unsigned long expires; 1134 1135 ASSERT_RTNL(); 1136 1137 spin_lock_bh(&ifp->lock); 1138 state = ifp->state; 1139 ifp->state = INET6_IFADDR_STATE_DEAD; 1140 spin_unlock_bh(&ifp->lock); 1141 1142 if (state == INET6_IFADDR_STATE_DEAD) 1143 goto out; 1144 1145 spin_lock_bh(&addrconf_hash_lock); 1146 hlist_del_init_rcu(&ifp->addr_lst); 1147 spin_unlock_bh(&addrconf_hash_lock); 1148 1149 write_lock_bh(&ifp->idev->lock); 1150 1151 if (ifp->flags&IFA_F_TEMPORARY) { 1152 list_del(&ifp->tmp_list); 1153 if (ifp->ifpub) { 1154 in6_ifa_put(ifp->ifpub); 1155 ifp->ifpub = NULL; 1156 } 1157 __in6_ifa_put(ifp); 1158 } 1159 1160 if (ifp->flags & IFA_F_PERMANENT && !(ifp->flags & IFA_F_NOPREFIXROUTE)) 1161 action = check_cleanup_prefix_route(ifp, &expires); 1162 1163 list_del_init(&ifp->if_list); 1164 __in6_ifa_put(ifp); 1165 1166 write_unlock_bh(&ifp->idev->lock); 1167 1168 addrconf_del_dad_work(ifp); 1169 1170 ipv6_ifa_notify(RTM_DELADDR, ifp); 1171 1172 inet6addr_notifier_call_chain(NETDEV_DOWN, ifp); 1173 1174 if (action != CLEANUP_PREFIX_RT_NOP) { 1175 cleanup_prefix_route(ifp, expires, 1176 action == CLEANUP_PREFIX_RT_DEL); 1177 } 1178 1179 /* clean up prefsrc entries */ 1180 rt6_remove_prefsrc(ifp); 1181 out: 1182 in6_ifa_put(ifp); 1183 } 1184 1185 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift) 1186 { 1187 struct inet6_dev *idev = ifp->idev; 1188 struct in6_addr addr, *tmpaddr; 1189 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_tstamp, age; 1190 unsigned long regen_advance; 1191 int tmp_plen; 1192 int ret = 0; 1193 u32 addr_flags; 1194 unsigned long now = jiffies; 1195 long max_desync_factor; 1196 s32 cnf_temp_preferred_lft; 1197 1198 write_lock_bh(&idev->lock); 1199 if (ift) { 1200 spin_lock_bh(&ift->lock); 1201 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8); 1202 spin_unlock_bh(&ift->lock); 1203 tmpaddr = &addr; 1204 } else { 1205 tmpaddr = NULL; 1206 } 1207 retry: 1208 in6_dev_hold(idev); 1209 if (idev->cnf.use_tempaddr <= 0) { 1210 write_unlock_bh(&idev->lock); 1211 pr_info("%s: use_tempaddr is disabled\n", __func__); 1212 in6_dev_put(idev); 1213 ret = -1; 1214 goto out; 1215 } 1216 spin_lock_bh(&ifp->lock); 1217 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) { 1218 idev->cnf.use_tempaddr = -1; /*XXX*/ 1219 spin_unlock_bh(&ifp->lock); 1220 write_unlock_bh(&idev->lock); 1221 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n", 1222 __func__); 1223 in6_dev_put(idev); 1224 ret = -1; 1225 goto out; 1226 } 1227 in6_ifa_hold(ifp); 1228 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8); 1229 ipv6_try_regen_rndid(idev, tmpaddr); 1230 memcpy(&addr.s6_addr[8], idev->rndid, 8); 1231 age = (now - ifp->tstamp) / HZ; 1232 1233 regen_advance = idev->cnf.regen_max_retry * 1234 idev->cnf.dad_transmits * 1235 NEIGH_VAR(idev->nd_parms, RETRANS_TIME) / HZ; 1236 1237 /* recalculate max_desync_factor each time and update 1238 * idev->desync_factor if it's larger 1239 */ 1240 cnf_temp_preferred_lft = READ_ONCE(idev->cnf.temp_prefered_lft); 1241 max_desync_factor = min_t(__u32, 1242 idev->cnf.max_desync_factor, 1243 cnf_temp_preferred_lft - regen_advance); 1244 1245 if (unlikely(idev->desync_factor > max_desync_factor)) { 1246 if (max_desync_factor > 0) { 1247 get_random_bytes(&idev->desync_factor, 1248 sizeof(idev->desync_factor)); 1249 idev->desync_factor %= max_desync_factor; 1250 } else { 1251 idev->desync_factor = 0; 1252 } 1253 } 1254 1255 tmp_valid_lft = min_t(__u32, 1256 ifp->valid_lft, 1257 idev->cnf.temp_valid_lft + age); 1258 tmp_prefered_lft = cnf_temp_preferred_lft + age - 1259 idev->desync_factor; 1260 tmp_prefered_lft = min_t(__u32, ifp->prefered_lft, tmp_prefered_lft); 1261 tmp_plen = ifp->prefix_len; 1262 tmp_tstamp = ifp->tstamp; 1263 spin_unlock_bh(&ifp->lock); 1264 1265 write_unlock_bh(&idev->lock); 1266 1267 /* A temporary address is created only if this calculated Preferred 1268 * Lifetime is greater than REGEN_ADVANCE time units. In particular, 1269 * an implementation must not create a temporary address with a zero 1270 * Preferred Lifetime. 1271 * Use age calculation as in addrconf_verify to avoid unnecessary 1272 * temporary addresses being generated. 1273 */ 1274 age = (now - tmp_tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ; 1275 if (tmp_prefered_lft <= regen_advance + age) { 1276 in6_ifa_put(ifp); 1277 in6_dev_put(idev); 1278 ret = -1; 1279 goto out; 1280 } 1281 1282 addr_flags = IFA_F_TEMPORARY; 1283 /* set in addrconf_prefix_rcv() */ 1284 if (ifp->flags & IFA_F_OPTIMISTIC) 1285 addr_flags |= IFA_F_OPTIMISTIC; 1286 1287 ift = ipv6_add_addr(idev, &addr, NULL, tmp_plen, 1288 ipv6_addr_scope(&addr), addr_flags, 1289 tmp_valid_lft, tmp_prefered_lft); 1290 if (IS_ERR(ift)) { 1291 in6_ifa_put(ifp); 1292 in6_dev_put(idev); 1293 pr_info("%s: retry temporary address regeneration\n", __func__); 1294 tmpaddr = &addr; 1295 write_lock_bh(&idev->lock); 1296 goto retry; 1297 } 1298 1299 spin_lock_bh(&ift->lock); 1300 ift->ifpub = ifp; 1301 ift->cstamp = now; 1302 ift->tstamp = tmp_tstamp; 1303 spin_unlock_bh(&ift->lock); 1304 1305 addrconf_dad_start(ift); 1306 in6_ifa_put(ift); 1307 in6_dev_put(idev); 1308 out: 1309 return ret; 1310 } 1311 1312 /* 1313 * Choose an appropriate source address (RFC3484) 1314 */ 1315 enum { 1316 IPV6_SADDR_RULE_INIT = 0, 1317 IPV6_SADDR_RULE_LOCAL, 1318 IPV6_SADDR_RULE_SCOPE, 1319 IPV6_SADDR_RULE_PREFERRED, 1320 #ifdef CONFIG_IPV6_MIP6 1321 IPV6_SADDR_RULE_HOA, 1322 #endif 1323 IPV6_SADDR_RULE_OIF, 1324 IPV6_SADDR_RULE_LABEL, 1325 IPV6_SADDR_RULE_PRIVACY, 1326 IPV6_SADDR_RULE_ORCHID, 1327 IPV6_SADDR_RULE_PREFIX, 1328 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1329 IPV6_SADDR_RULE_NOT_OPTIMISTIC, 1330 #endif 1331 IPV6_SADDR_RULE_MAX 1332 }; 1333 1334 struct ipv6_saddr_score { 1335 int rule; 1336 int addr_type; 1337 struct inet6_ifaddr *ifa; 1338 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX); 1339 int scopedist; 1340 int matchlen; 1341 }; 1342 1343 struct ipv6_saddr_dst { 1344 const struct in6_addr *addr; 1345 int ifindex; 1346 int scope; 1347 int label; 1348 unsigned int prefs; 1349 }; 1350 1351 static inline int ipv6_saddr_preferred(int type) 1352 { 1353 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK)) 1354 return 1; 1355 return 0; 1356 } 1357 1358 static inline bool ipv6_use_optimistic_addr(struct inet6_dev *idev) 1359 { 1360 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1361 return idev && idev->cnf.optimistic_dad && idev->cnf.use_optimistic; 1362 #else 1363 return false; 1364 #endif 1365 } 1366 1367 static int ipv6_get_saddr_eval(struct net *net, 1368 struct ipv6_saddr_score *score, 1369 struct ipv6_saddr_dst *dst, 1370 int i) 1371 { 1372 int ret; 1373 1374 if (i <= score->rule) { 1375 switch (i) { 1376 case IPV6_SADDR_RULE_SCOPE: 1377 ret = score->scopedist; 1378 break; 1379 case IPV6_SADDR_RULE_PREFIX: 1380 ret = score->matchlen; 1381 break; 1382 default: 1383 ret = !!test_bit(i, score->scorebits); 1384 } 1385 goto out; 1386 } 1387 1388 switch (i) { 1389 case IPV6_SADDR_RULE_INIT: 1390 /* Rule 0: remember if hiscore is not ready yet */ 1391 ret = !!score->ifa; 1392 break; 1393 case IPV6_SADDR_RULE_LOCAL: 1394 /* Rule 1: Prefer same address */ 1395 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr); 1396 break; 1397 case IPV6_SADDR_RULE_SCOPE: 1398 /* Rule 2: Prefer appropriate scope 1399 * 1400 * ret 1401 * ^ 1402 * -1 | d 15 1403 * ---+--+-+---> scope 1404 * | 1405 * | d is scope of the destination. 1406 * B-d | \ 1407 * | \ <- smaller scope is better if 1408 * B-15 | \ if scope is enough for destination. 1409 * | ret = B - scope (-1 <= scope >= d <= 15). 1410 * d-C-1 | / 1411 * |/ <- greater is better 1412 * -C / if scope is not enough for destination. 1413 * /| ret = scope - C (-1 <= d < scope <= 15). 1414 * 1415 * d - C - 1 < B -15 (for all -1 <= d <= 15). 1416 * C > d + 14 - B >= 15 + 14 - B = 29 - B. 1417 * Assume B = 0 and we get C > 29. 1418 */ 1419 ret = __ipv6_addr_src_scope(score->addr_type); 1420 if (ret >= dst->scope) 1421 ret = -ret; 1422 else 1423 ret -= 128; /* 30 is enough */ 1424 score->scopedist = ret; 1425 break; 1426 case IPV6_SADDR_RULE_PREFERRED: 1427 { 1428 /* Rule 3: Avoid deprecated and optimistic addresses */ 1429 u8 avoid = IFA_F_DEPRECATED; 1430 1431 if (!ipv6_use_optimistic_addr(score->ifa->idev)) 1432 avoid |= IFA_F_OPTIMISTIC; 1433 ret = ipv6_saddr_preferred(score->addr_type) || 1434 !(score->ifa->flags & avoid); 1435 break; 1436 } 1437 #ifdef CONFIG_IPV6_MIP6 1438 case IPV6_SADDR_RULE_HOA: 1439 { 1440 /* Rule 4: Prefer home address */ 1441 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA); 1442 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome; 1443 break; 1444 } 1445 #endif 1446 case IPV6_SADDR_RULE_OIF: 1447 /* Rule 5: Prefer outgoing interface */ 1448 ret = (!dst->ifindex || 1449 dst->ifindex == score->ifa->idev->dev->ifindex); 1450 break; 1451 case IPV6_SADDR_RULE_LABEL: 1452 /* Rule 6: Prefer matching label */ 1453 ret = ipv6_addr_label(net, 1454 &score->ifa->addr, score->addr_type, 1455 score->ifa->idev->dev->ifindex) == dst->label; 1456 break; 1457 case IPV6_SADDR_RULE_PRIVACY: 1458 { 1459 /* Rule 7: Prefer public address 1460 * Note: prefer temporary address if use_tempaddr >= 2 1461 */ 1462 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ? 1463 !!(dst->prefs & IPV6_PREFER_SRC_TMP) : 1464 score->ifa->idev->cnf.use_tempaddr >= 2; 1465 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp; 1466 break; 1467 } 1468 case IPV6_SADDR_RULE_ORCHID: 1469 /* Rule 8-: Prefer ORCHID vs ORCHID or 1470 * non-ORCHID vs non-ORCHID 1471 */ 1472 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^ 1473 ipv6_addr_orchid(dst->addr)); 1474 break; 1475 case IPV6_SADDR_RULE_PREFIX: 1476 /* Rule 8: Use longest matching prefix */ 1477 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr); 1478 if (ret > score->ifa->prefix_len) 1479 ret = score->ifa->prefix_len; 1480 score->matchlen = ret; 1481 break; 1482 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1483 case IPV6_SADDR_RULE_NOT_OPTIMISTIC: 1484 /* Optimistic addresses still have lower precedence than other 1485 * preferred addresses. 1486 */ 1487 ret = !(score->ifa->flags & IFA_F_OPTIMISTIC); 1488 break; 1489 #endif 1490 default: 1491 ret = 0; 1492 } 1493 1494 if (ret) 1495 __set_bit(i, score->scorebits); 1496 score->rule = i; 1497 out: 1498 return ret; 1499 } 1500 1501 static int __ipv6_dev_get_saddr(struct net *net, 1502 struct ipv6_saddr_dst *dst, 1503 struct inet6_dev *idev, 1504 struct ipv6_saddr_score *scores, 1505 int hiscore_idx) 1506 { 1507 struct ipv6_saddr_score *score = &scores[1 - hiscore_idx], *hiscore = &scores[hiscore_idx]; 1508 1509 read_lock_bh(&idev->lock); 1510 list_for_each_entry(score->ifa, &idev->addr_list, if_list) { 1511 int i; 1512 1513 /* 1514 * - Tentative Address (RFC2462 section 5.4) 1515 * - A tentative address is not considered 1516 * "assigned to an interface" in the traditional 1517 * sense, unless it is also flagged as optimistic. 1518 * - Candidate Source Address (section 4) 1519 * - In any case, anycast addresses, multicast 1520 * addresses, and the unspecified address MUST 1521 * NOT be included in a candidate set. 1522 */ 1523 if ((score->ifa->flags & IFA_F_TENTATIVE) && 1524 (!(score->ifa->flags & IFA_F_OPTIMISTIC))) 1525 continue; 1526 1527 score->addr_type = __ipv6_addr_type(&score->ifa->addr); 1528 1529 if (unlikely(score->addr_type == IPV6_ADDR_ANY || 1530 score->addr_type & IPV6_ADDR_MULTICAST)) { 1531 net_dbg_ratelimited("ADDRCONF: unspecified / multicast address assigned as unicast address on %s", 1532 idev->dev->name); 1533 continue; 1534 } 1535 1536 score->rule = -1; 1537 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX); 1538 1539 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) { 1540 int minihiscore, miniscore; 1541 1542 minihiscore = ipv6_get_saddr_eval(net, hiscore, dst, i); 1543 miniscore = ipv6_get_saddr_eval(net, score, dst, i); 1544 1545 if (minihiscore > miniscore) { 1546 if (i == IPV6_SADDR_RULE_SCOPE && 1547 score->scopedist > 0) { 1548 /* 1549 * special case: 1550 * each remaining entry 1551 * has too small (not enough) 1552 * scope, because ifa entries 1553 * are sorted by their scope 1554 * values. 1555 */ 1556 goto out; 1557 } 1558 break; 1559 } else if (minihiscore < miniscore) { 1560 if (hiscore->ifa) 1561 in6_ifa_put(hiscore->ifa); 1562 1563 in6_ifa_hold(score->ifa); 1564 1565 swap(hiscore, score); 1566 hiscore_idx = 1 - hiscore_idx; 1567 1568 /* restore our iterator */ 1569 score->ifa = hiscore->ifa; 1570 1571 break; 1572 } 1573 } 1574 } 1575 out: 1576 read_unlock_bh(&idev->lock); 1577 return hiscore_idx; 1578 } 1579 1580 static int ipv6_get_saddr_master(struct net *net, 1581 const struct net_device *dst_dev, 1582 const struct net_device *master, 1583 struct ipv6_saddr_dst *dst, 1584 struct ipv6_saddr_score *scores, 1585 int hiscore_idx) 1586 { 1587 struct inet6_dev *idev; 1588 1589 idev = __in6_dev_get(dst_dev); 1590 if (idev) 1591 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev, 1592 scores, hiscore_idx); 1593 1594 idev = __in6_dev_get(master); 1595 if (idev) 1596 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev, 1597 scores, hiscore_idx); 1598 1599 return hiscore_idx; 1600 } 1601 1602 int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev, 1603 const struct in6_addr *daddr, unsigned int prefs, 1604 struct in6_addr *saddr) 1605 { 1606 struct ipv6_saddr_score scores[2], *hiscore; 1607 struct ipv6_saddr_dst dst; 1608 struct inet6_dev *idev; 1609 struct net_device *dev; 1610 int dst_type; 1611 bool use_oif_addr = false; 1612 int hiscore_idx = 0; 1613 1614 dst_type = __ipv6_addr_type(daddr); 1615 dst.addr = daddr; 1616 dst.ifindex = dst_dev ? dst_dev->ifindex : 0; 1617 dst.scope = __ipv6_addr_src_scope(dst_type); 1618 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex); 1619 dst.prefs = prefs; 1620 1621 scores[hiscore_idx].rule = -1; 1622 scores[hiscore_idx].ifa = NULL; 1623 1624 rcu_read_lock(); 1625 1626 /* Candidate Source Address (section 4) 1627 * - multicast and link-local destination address, 1628 * the set of candidate source address MUST only 1629 * include addresses assigned to interfaces 1630 * belonging to the same link as the outgoing 1631 * interface. 1632 * (- For site-local destination addresses, the 1633 * set of candidate source addresses MUST only 1634 * include addresses assigned to interfaces 1635 * belonging to the same site as the outgoing 1636 * interface.) 1637 * - "It is RECOMMENDED that the candidate source addresses 1638 * be the set of unicast addresses assigned to the 1639 * interface that will be used to send to the destination 1640 * (the 'outgoing' interface)." (RFC 6724) 1641 */ 1642 if (dst_dev) { 1643 idev = __in6_dev_get(dst_dev); 1644 if ((dst_type & IPV6_ADDR_MULTICAST) || 1645 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL || 1646 (idev && idev->cnf.use_oif_addrs_only)) { 1647 use_oif_addr = true; 1648 } 1649 } 1650 1651 if (use_oif_addr) { 1652 if (idev) 1653 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx); 1654 } else { 1655 const struct net_device *master; 1656 int master_idx = 0; 1657 1658 /* if dst_dev exists and is enslaved to an L3 device, then 1659 * prefer addresses from dst_dev and then the master over 1660 * any other enslaved devices in the L3 domain. 1661 */ 1662 master = l3mdev_master_dev_rcu(dst_dev); 1663 if (master) { 1664 master_idx = master->ifindex; 1665 1666 hiscore_idx = ipv6_get_saddr_master(net, dst_dev, 1667 master, &dst, 1668 scores, hiscore_idx); 1669 1670 if (scores[hiscore_idx].ifa) 1671 goto out; 1672 } 1673 1674 for_each_netdev_rcu(net, dev) { 1675 /* only consider addresses on devices in the 1676 * same L3 domain 1677 */ 1678 if (l3mdev_master_ifindex_rcu(dev) != master_idx) 1679 continue; 1680 idev = __in6_dev_get(dev); 1681 if (!idev) 1682 continue; 1683 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx); 1684 } 1685 } 1686 1687 out: 1688 rcu_read_unlock(); 1689 1690 hiscore = &scores[hiscore_idx]; 1691 if (!hiscore->ifa) 1692 return -EADDRNOTAVAIL; 1693 1694 *saddr = hiscore->ifa->addr; 1695 in6_ifa_put(hiscore->ifa); 1696 return 0; 1697 } 1698 EXPORT_SYMBOL(ipv6_dev_get_saddr); 1699 1700 int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr, 1701 u32 banned_flags) 1702 { 1703 struct inet6_ifaddr *ifp; 1704 int err = -EADDRNOTAVAIL; 1705 1706 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) { 1707 if (ifp->scope > IFA_LINK) 1708 break; 1709 if (ifp->scope == IFA_LINK && 1710 !(ifp->flags & banned_flags)) { 1711 *addr = ifp->addr; 1712 err = 0; 1713 break; 1714 } 1715 } 1716 return err; 1717 } 1718 1719 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr, 1720 u32 banned_flags) 1721 { 1722 struct inet6_dev *idev; 1723 int err = -EADDRNOTAVAIL; 1724 1725 rcu_read_lock(); 1726 idev = __in6_dev_get(dev); 1727 if (idev) { 1728 read_lock_bh(&idev->lock); 1729 err = __ipv6_get_lladdr(idev, addr, banned_flags); 1730 read_unlock_bh(&idev->lock); 1731 } 1732 rcu_read_unlock(); 1733 return err; 1734 } 1735 1736 static int ipv6_count_addresses(struct inet6_dev *idev) 1737 { 1738 int cnt = 0; 1739 struct inet6_ifaddr *ifp; 1740 1741 read_lock_bh(&idev->lock); 1742 list_for_each_entry(ifp, &idev->addr_list, if_list) 1743 cnt++; 1744 read_unlock_bh(&idev->lock); 1745 return cnt; 1746 } 1747 1748 int ipv6_chk_addr(struct net *net, const struct in6_addr *addr, 1749 const struct net_device *dev, int strict) 1750 { 1751 return ipv6_chk_addr_and_flags(net, addr, dev, strict, IFA_F_TENTATIVE); 1752 } 1753 EXPORT_SYMBOL(ipv6_chk_addr); 1754 1755 int ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr, 1756 const struct net_device *dev, int strict, 1757 u32 banned_flags) 1758 { 1759 struct inet6_ifaddr *ifp; 1760 unsigned int hash = inet6_addr_hash(addr); 1761 u32 ifp_flags; 1762 1763 rcu_read_lock_bh(); 1764 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) { 1765 if (!net_eq(dev_net(ifp->idev->dev), net)) 1766 continue; 1767 /* Decouple optimistic from tentative for evaluation here. 1768 * Ban optimistic addresses explicitly, when required. 1769 */ 1770 ifp_flags = (ifp->flags&IFA_F_OPTIMISTIC) 1771 ? (ifp->flags&~IFA_F_TENTATIVE) 1772 : ifp->flags; 1773 if (ipv6_addr_equal(&ifp->addr, addr) && 1774 !(ifp_flags&banned_flags) && 1775 (!dev || ifp->idev->dev == dev || 1776 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) { 1777 rcu_read_unlock_bh(); 1778 return 1; 1779 } 1780 } 1781 1782 rcu_read_unlock_bh(); 1783 return 0; 1784 } 1785 EXPORT_SYMBOL(ipv6_chk_addr_and_flags); 1786 1787 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr, 1788 struct net_device *dev) 1789 { 1790 unsigned int hash = inet6_addr_hash(addr); 1791 struct inet6_ifaddr *ifp; 1792 1793 hlist_for_each_entry(ifp, &inet6_addr_lst[hash], addr_lst) { 1794 if (!net_eq(dev_net(ifp->idev->dev), net)) 1795 continue; 1796 if (ipv6_addr_equal(&ifp->addr, addr)) { 1797 if (!dev || ifp->idev->dev == dev) 1798 return true; 1799 } 1800 } 1801 return false; 1802 } 1803 1804 /* Compares an address/prefix_len with addresses on device @dev. 1805 * If one is found it returns true. 1806 */ 1807 bool ipv6_chk_custom_prefix(const struct in6_addr *addr, 1808 const unsigned int prefix_len, struct net_device *dev) 1809 { 1810 struct inet6_dev *idev; 1811 struct inet6_ifaddr *ifa; 1812 bool ret = false; 1813 1814 rcu_read_lock(); 1815 idev = __in6_dev_get(dev); 1816 if (idev) { 1817 read_lock_bh(&idev->lock); 1818 list_for_each_entry(ifa, &idev->addr_list, if_list) { 1819 ret = ipv6_prefix_equal(addr, &ifa->addr, prefix_len); 1820 if (ret) 1821 break; 1822 } 1823 read_unlock_bh(&idev->lock); 1824 } 1825 rcu_read_unlock(); 1826 1827 return ret; 1828 } 1829 EXPORT_SYMBOL(ipv6_chk_custom_prefix); 1830 1831 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev) 1832 { 1833 struct inet6_dev *idev; 1834 struct inet6_ifaddr *ifa; 1835 int onlink; 1836 1837 onlink = 0; 1838 rcu_read_lock(); 1839 idev = __in6_dev_get(dev); 1840 if (idev) { 1841 read_lock_bh(&idev->lock); 1842 list_for_each_entry(ifa, &idev->addr_list, if_list) { 1843 onlink = ipv6_prefix_equal(addr, &ifa->addr, 1844 ifa->prefix_len); 1845 if (onlink) 1846 break; 1847 } 1848 read_unlock_bh(&idev->lock); 1849 } 1850 rcu_read_unlock(); 1851 return onlink; 1852 } 1853 EXPORT_SYMBOL(ipv6_chk_prefix); 1854 1855 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr, 1856 struct net_device *dev, int strict) 1857 { 1858 struct inet6_ifaddr *ifp, *result = NULL; 1859 unsigned int hash = inet6_addr_hash(addr); 1860 1861 rcu_read_lock_bh(); 1862 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) { 1863 if (!net_eq(dev_net(ifp->idev->dev), net)) 1864 continue; 1865 if (ipv6_addr_equal(&ifp->addr, addr)) { 1866 if (!dev || ifp->idev->dev == dev || 1867 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) { 1868 result = ifp; 1869 in6_ifa_hold(ifp); 1870 break; 1871 } 1872 } 1873 } 1874 rcu_read_unlock_bh(); 1875 1876 return result; 1877 } 1878 1879 /* Gets referenced address, destroys ifaddr */ 1880 1881 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed) 1882 { 1883 if (dad_failed) 1884 ifp->flags |= IFA_F_DADFAILED; 1885 1886 if (ifp->flags&IFA_F_PERMANENT) { 1887 spin_lock_bh(&ifp->lock); 1888 addrconf_del_dad_work(ifp); 1889 ifp->flags |= IFA_F_TENTATIVE; 1890 spin_unlock_bh(&ifp->lock); 1891 if (dad_failed) 1892 ipv6_ifa_notify(0, ifp); 1893 in6_ifa_put(ifp); 1894 } else if (ifp->flags&IFA_F_TEMPORARY) { 1895 struct inet6_ifaddr *ifpub; 1896 spin_lock_bh(&ifp->lock); 1897 ifpub = ifp->ifpub; 1898 if (ifpub) { 1899 in6_ifa_hold(ifpub); 1900 spin_unlock_bh(&ifp->lock); 1901 ipv6_create_tempaddr(ifpub, ifp); 1902 in6_ifa_put(ifpub); 1903 } else { 1904 spin_unlock_bh(&ifp->lock); 1905 } 1906 ipv6_del_addr(ifp); 1907 } else { 1908 ipv6_del_addr(ifp); 1909 } 1910 } 1911 1912 static int addrconf_dad_end(struct inet6_ifaddr *ifp) 1913 { 1914 int err = -ENOENT; 1915 1916 spin_lock_bh(&ifp->lock); 1917 if (ifp->state == INET6_IFADDR_STATE_DAD) { 1918 ifp->state = INET6_IFADDR_STATE_POSTDAD; 1919 err = 0; 1920 } 1921 spin_unlock_bh(&ifp->lock); 1922 1923 return err; 1924 } 1925 1926 void addrconf_dad_failure(struct inet6_ifaddr *ifp) 1927 { 1928 struct inet6_dev *idev = ifp->idev; 1929 struct net *net = dev_net(ifp->idev->dev); 1930 1931 if (addrconf_dad_end(ifp)) { 1932 in6_ifa_put(ifp); 1933 return; 1934 } 1935 1936 net_info_ratelimited("%s: IPv6 duplicate address %pI6c detected!\n", 1937 ifp->idev->dev->name, &ifp->addr); 1938 1939 spin_lock_bh(&ifp->lock); 1940 1941 if (ifp->flags & IFA_F_STABLE_PRIVACY) { 1942 int scope = ifp->scope; 1943 u32 flags = ifp->flags; 1944 struct in6_addr new_addr; 1945 struct inet6_ifaddr *ifp2; 1946 u32 valid_lft, preferred_lft; 1947 int pfxlen = ifp->prefix_len; 1948 int retries = ifp->stable_privacy_retry + 1; 1949 1950 if (retries > net->ipv6.sysctl.idgen_retries) { 1951 net_info_ratelimited("%s: privacy stable address generation failed because of DAD conflicts!\n", 1952 ifp->idev->dev->name); 1953 goto errdad; 1954 } 1955 1956 new_addr = ifp->addr; 1957 if (ipv6_generate_stable_address(&new_addr, retries, 1958 idev)) 1959 goto errdad; 1960 1961 valid_lft = ifp->valid_lft; 1962 preferred_lft = ifp->prefered_lft; 1963 1964 spin_unlock_bh(&ifp->lock); 1965 1966 if (idev->cnf.max_addresses && 1967 ipv6_count_addresses(idev) >= 1968 idev->cnf.max_addresses) 1969 goto lock_errdad; 1970 1971 net_info_ratelimited("%s: generating new stable privacy address because of DAD conflict\n", 1972 ifp->idev->dev->name); 1973 1974 ifp2 = ipv6_add_addr(idev, &new_addr, NULL, pfxlen, 1975 scope, flags, valid_lft, 1976 preferred_lft); 1977 if (IS_ERR(ifp2)) 1978 goto lock_errdad; 1979 1980 spin_lock_bh(&ifp2->lock); 1981 ifp2->stable_privacy_retry = retries; 1982 ifp2->state = INET6_IFADDR_STATE_PREDAD; 1983 spin_unlock_bh(&ifp2->lock); 1984 1985 addrconf_mod_dad_work(ifp2, net->ipv6.sysctl.idgen_delay); 1986 in6_ifa_put(ifp2); 1987 lock_errdad: 1988 spin_lock_bh(&ifp->lock); 1989 } 1990 1991 errdad: 1992 /* transition from _POSTDAD to _ERRDAD */ 1993 ifp->state = INET6_IFADDR_STATE_ERRDAD; 1994 spin_unlock_bh(&ifp->lock); 1995 1996 addrconf_mod_dad_work(ifp, 0); 1997 in6_ifa_put(ifp); 1998 } 1999 2000 /* Join to solicited addr multicast group. 2001 * caller must hold RTNL */ 2002 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr) 2003 { 2004 struct in6_addr maddr; 2005 2006 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP)) 2007 return; 2008 2009 addrconf_addr_solict_mult(addr, &maddr); 2010 ipv6_dev_mc_inc(dev, &maddr); 2011 } 2012 2013 /* caller must hold RTNL */ 2014 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr) 2015 { 2016 struct in6_addr maddr; 2017 2018 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP)) 2019 return; 2020 2021 addrconf_addr_solict_mult(addr, &maddr); 2022 __ipv6_dev_mc_dec(idev, &maddr); 2023 } 2024 2025 /* caller must hold RTNL */ 2026 static void addrconf_join_anycast(struct inet6_ifaddr *ifp) 2027 { 2028 struct in6_addr addr; 2029 2030 if (ifp->prefix_len >= 127) /* RFC 6164 */ 2031 return; 2032 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len); 2033 if (ipv6_addr_any(&addr)) 2034 return; 2035 __ipv6_dev_ac_inc(ifp->idev, &addr); 2036 } 2037 2038 /* caller must hold RTNL */ 2039 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp) 2040 { 2041 struct in6_addr addr; 2042 2043 if (ifp->prefix_len >= 127) /* RFC 6164 */ 2044 return; 2045 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len); 2046 if (ipv6_addr_any(&addr)) 2047 return; 2048 __ipv6_dev_ac_dec(ifp->idev, &addr); 2049 } 2050 2051 static int addrconf_ifid_eui64(u8 *eui, struct net_device *dev) 2052 { 2053 if (dev->addr_len != EUI64_ADDR_LEN) 2054 return -1; 2055 memcpy(eui, dev->dev_addr, EUI64_ADDR_LEN); 2056 eui[0] ^= 2; 2057 return 0; 2058 } 2059 2060 static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev) 2061 { 2062 union fwnet_hwaddr *ha; 2063 2064 if (dev->addr_len != FWNET_ALEN) 2065 return -1; 2066 2067 ha = (union fwnet_hwaddr *)dev->dev_addr; 2068 2069 memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id)); 2070 eui[0] ^= 2; 2071 return 0; 2072 } 2073 2074 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev) 2075 { 2076 /* XXX: inherit EUI-64 from other interface -- yoshfuji */ 2077 if (dev->addr_len != ARCNET_ALEN) 2078 return -1; 2079 memset(eui, 0, 7); 2080 eui[7] = *(u8 *)dev->dev_addr; 2081 return 0; 2082 } 2083 2084 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev) 2085 { 2086 if (dev->addr_len != INFINIBAND_ALEN) 2087 return -1; 2088 memcpy(eui, dev->dev_addr + 12, 8); 2089 eui[0] |= 2; 2090 return 0; 2091 } 2092 2093 static int __ipv6_isatap_ifid(u8 *eui, __be32 addr) 2094 { 2095 if (addr == 0) 2096 return -1; 2097 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) || 2098 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) || 2099 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) || 2100 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) || 2101 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) || 2102 ipv4_is_lbcast(addr)) ? 0x00 : 0x02; 2103 eui[1] = 0; 2104 eui[2] = 0x5E; 2105 eui[3] = 0xFE; 2106 memcpy(eui + 4, &addr, 4); 2107 return 0; 2108 } 2109 2110 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev) 2111 { 2112 if (dev->priv_flags & IFF_ISATAP) 2113 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr); 2114 return -1; 2115 } 2116 2117 static int addrconf_ifid_gre(u8 *eui, struct net_device *dev) 2118 { 2119 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr); 2120 } 2121 2122 static int addrconf_ifid_ip6tnl(u8 *eui, struct net_device *dev) 2123 { 2124 memcpy(eui, dev->perm_addr, 3); 2125 memcpy(eui + 5, dev->perm_addr + 3, 3); 2126 eui[3] = 0xFF; 2127 eui[4] = 0xFE; 2128 eui[0] ^= 2; 2129 return 0; 2130 } 2131 2132 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev) 2133 { 2134 switch (dev->type) { 2135 case ARPHRD_ETHER: 2136 case ARPHRD_FDDI: 2137 return addrconf_ifid_eui48(eui, dev); 2138 case ARPHRD_ARCNET: 2139 return addrconf_ifid_arcnet(eui, dev); 2140 case ARPHRD_INFINIBAND: 2141 return addrconf_ifid_infiniband(eui, dev); 2142 case ARPHRD_SIT: 2143 return addrconf_ifid_sit(eui, dev); 2144 case ARPHRD_IPGRE: 2145 return addrconf_ifid_gre(eui, dev); 2146 case ARPHRD_6LOWPAN: 2147 return addrconf_ifid_eui64(eui, dev); 2148 case ARPHRD_IEEE1394: 2149 return addrconf_ifid_ieee1394(eui, dev); 2150 case ARPHRD_TUNNEL6: 2151 return addrconf_ifid_ip6tnl(eui, dev); 2152 } 2153 return -1; 2154 } 2155 2156 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev) 2157 { 2158 int err = -1; 2159 struct inet6_ifaddr *ifp; 2160 2161 read_lock_bh(&idev->lock); 2162 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) { 2163 if (ifp->scope > IFA_LINK) 2164 break; 2165 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) { 2166 memcpy(eui, ifp->addr.s6_addr+8, 8); 2167 err = 0; 2168 break; 2169 } 2170 } 2171 read_unlock_bh(&idev->lock); 2172 return err; 2173 } 2174 2175 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */ 2176 static void ipv6_regen_rndid(struct inet6_dev *idev) 2177 { 2178 regen: 2179 get_random_bytes(idev->rndid, sizeof(idev->rndid)); 2180 idev->rndid[0] &= ~0x02; 2181 2182 /* 2183 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>: 2184 * check if generated address is not inappropriate 2185 * 2186 * - Reserved subnet anycast (RFC 2526) 2187 * 11111101 11....11 1xxxxxxx 2188 * - ISATAP (RFC4214) 6.1 2189 * 00-00-5E-FE-xx-xx-xx-xx 2190 * - value 0 2191 * - XXX: already assigned to an address on the device 2192 */ 2193 if (idev->rndid[0] == 0xfd && 2194 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff && 2195 (idev->rndid[7]&0x80)) 2196 goto regen; 2197 if ((idev->rndid[0]|idev->rndid[1]) == 0) { 2198 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe) 2199 goto regen; 2200 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00) 2201 goto regen; 2202 } 2203 } 2204 2205 static void ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) 2206 { 2207 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0) 2208 ipv6_regen_rndid(idev); 2209 } 2210 2211 /* 2212 * Add prefix route. 2213 */ 2214 2215 static void 2216 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev, 2217 unsigned long expires, u32 flags) 2218 { 2219 struct fib6_config cfg = { 2220 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX, 2221 .fc_metric = IP6_RT_PRIO_ADDRCONF, 2222 .fc_ifindex = dev->ifindex, 2223 .fc_expires = expires, 2224 .fc_dst_len = plen, 2225 .fc_flags = RTF_UP | flags, 2226 .fc_nlinfo.nl_net = dev_net(dev), 2227 .fc_protocol = RTPROT_KERNEL, 2228 }; 2229 2230 cfg.fc_dst = *pfx; 2231 2232 /* Prevent useless cloning on PtP SIT. 2233 This thing is done here expecting that the whole 2234 class of non-broadcast devices need not cloning. 2235 */ 2236 #if IS_ENABLED(CONFIG_IPV6_SIT) 2237 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT)) 2238 cfg.fc_flags |= RTF_NONEXTHOP; 2239 #endif 2240 2241 ip6_route_add(&cfg); 2242 } 2243 2244 2245 static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx, 2246 int plen, 2247 const struct net_device *dev, 2248 u32 flags, u32 noflags) 2249 { 2250 struct fib6_node *fn; 2251 struct rt6_info *rt = NULL; 2252 struct fib6_table *table; 2253 u32 tb_id = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX; 2254 2255 table = fib6_get_table(dev_net(dev), tb_id); 2256 if (!table) 2257 return NULL; 2258 2259 read_lock_bh(&table->tb6_lock); 2260 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0); 2261 if (!fn) 2262 goto out; 2263 2264 noflags |= RTF_CACHE; 2265 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) { 2266 if (rt->dst.dev->ifindex != dev->ifindex) 2267 continue; 2268 if ((rt->rt6i_flags & flags) != flags) 2269 continue; 2270 if ((rt->rt6i_flags & noflags) != 0) 2271 continue; 2272 dst_hold(&rt->dst); 2273 break; 2274 } 2275 out: 2276 read_unlock_bh(&table->tb6_lock); 2277 return rt; 2278 } 2279 2280 2281 /* Create "default" multicast route to the interface */ 2282 2283 static void addrconf_add_mroute(struct net_device *dev) 2284 { 2285 struct fib6_config cfg = { 2286 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_LOCAL, 2287 .fc_metric = IP6_RT_PRIO_ADDRCONF, 2288 .fc_ifindex = dev->ifindex, 2289 .fc_dst_len = 8, 2290 .fc_flags = RTF_UP, 2291 .fc_nlinfo.nl_net = dev_net(dev), 2292 }; 2293 2294 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0); 2295 2296 ip6_route_add(&cfg); 2297 } 2298 2299 static struct inet6_dev *addrconf_add_dev(struct net_device *dev) 2300 { 2301 struct inet6_dev *idev; 2302 2303 ASSERT_RTNL(); 2304 2305 idev = ipv6_find_idev(dev); 2306 if (!idev) 2307 return ERR_PTR(-ENOBUFS); 2308 2309 if (idev->cnf.disable_ipv6) 2310 return ERR_PTR(-EACCES); 2311 2312 /* Add default multicast route */ 2313 if (!(dev->flags & IFF_LOOPBACK) && !netif_is_l3_master(dev)) 2314 addrconf_add_mroute(dev); 2315 2316 return idev; 2317 } 2318 2319 static void manage_tempaddrs(struct inet6_dev *idev, 2320 struct inet6_ifaddr *ifp, 2321 __u32 valid_lft, __u32 prefered_lft, 2322 bool create, unsigned long now) 2323 { 2324 u32 flags; 2325 struct inet6_ifaddr *ift; 2326 2327 read_lock_bh(&idev->lock); 2328 /* update all temporary addresses in the list */ 2329 list_for_each_entry(ift, &idev->tempaddr_list, tmp_list) { 2330 int age, max_valid, max_prefered; 2331 2332 if (ifp != ift->ifpub) 2333 continue; 2334 2335 /* RFC 4941 section 3.3: 2336 * If a received option will extend the lifetime of a public 2337 * address, the lifetimes of temporary addresses should 2338 * be extended, subject to the overall constraint that no 2339 * temporary addresses should ever remain "valid" or "preferred" 2340 * for a time longer than (TEMP_VALID_LIFETIME) or 2341 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), respectively. 2342 */ 2343 age = (now - ift->cstamp) / HZ; 2344 max_valid = idev->cnf.temp_valid_lft - age; 2345 if (max_valid < 0) 2346 max_valid = 0; 2347 2348 max_prefered = idev->cnf.temp_prefered_lft - 2349 idev->desync_factor - age; 2350 if (max_prefered < 0) 2351 max_prefered = 0; 2352 2353 if (valid_lft > max_valid) 2354 valid_lft = max_valid; 2355 2356 if (prefered_lft > max_prefered) 2357 prefered_lft = max_prefered; 2358 2359 spin_lock(&ift->lock); 2360 flags = ift->flags; 2361 ift->valid_lft = valid_lft; 2362 ift->prefered_lft = prefered_lft; 2363 ift->tstamp = now; 2364 if (prefered_lft > 0) 2365 ift->flags &= ~IFA_F_DEPRECATED; 2366 2367 spin_unlock(&ift->lock); 2368 if (!(flags&IFA_F_TENTATIVE)) 2369 ipv6_ifa_notify(0, ift); 2370 } 2371 2372 if ((create || list_empty(&idev->tempaddr_list)) && 2373 idev->cnf.use_tempaddr > 0) { 2374 /* When a new public address is created as described 2375 * in [ADDRCONF], also create a new temporary address. 2376 * Also create a temporary address if it's enabled but 2377 * no temporary address currently exists. 2378 */ 2379 read_unlock_bh(&idev->lock); 2380 ipv6_create_tempaddr(ifp, NULL); 2381 } else { 2382 read_unlock_bh(&idev->lock); 2383 } 2384 } 2385 2386 static bool is_addr_mode_generate_stable(struct inet6_dev *idev) 2387 { 2388 return idev->addr_gen_mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY || 2389 idev->addr_gen_mode == IN6_ADDR_GEN_MODE_RANDOM; 2390 } 2391 2392 int addrconf_prefix_rcv_add_addr(struct net *net, struct net_device *dev, 2393 const struct prefix_info *pinfo, 2394 struct inet6_dev *in6_dev, 2395 const struct in6_addr *addr, int addr_type, 2396 u32 addr_flags, bool sllao, bool tokenized, 2397 __u32 valid_lft, u32 prefered_lft) 2398 { 2399 struct inet6_ifaddr *ifp = ipv6_get_ifaddr(net, addr, dev, 1); 2400 int create = 0, update_lft = 0; 2401 2402 if (!ifp && valid_lft) { 2403 int max_addresses = in6_dev->cnf.max_addresses; 2404 2405 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 2406 if (in6_dev->cnf.optimistic_dad && 2407 !net->ipv6.devconf_all->forwarding && sllao) 2408 addr_flags |= IFA_F_OPTIMISTIC; 2409 #endif 2410 2411 /* Do not allow to create too much of autoconfigured 2412 * addresses; this would be too easy way to crash kernel. 2413 */ 2414 if (!max_addresses || 2415 ipv6_count_addresses(in6_dev) < max_addresses) 2416 ifp = ipv6_add_addr(in6_dev, addr, NULL, 2417 pinfo->prefix_len, 2418 addr_type&IPV6_ADDR_SCOPE_MASK, 2419 addr_flags, valid_lft, 2420 prefered_lft); 2421 2422 if (IS_ERR_OR_NULL(ifp)) 2423 return -1; 2424 2425 update_lft = 0; 2426 create = 1; 2427 spin_lock_bh(&ifp->lock); 2428 ifp->flags |= IFA_F_MANAGETEMPADDR; 2429 ifp->cstamp = jiffies; 2430 ifp->tokenized = tokenized; 2431 spin_unlock_bh(&ifp->lock); 2432 addrconf_dad_start(ifp); 2433 } 2434 2435 if (ifp) { 2436 u32 flags; 2437 unsigned long now; 2438 u32 stored_lft; 2439 2440 /* update lifetime (RFC2462 5.5.3 e) */ 2441 spin_lock_bh(&ifp->lock); 2442 now = jiffies; 2443 if (ifp->valid_lft > (now - ifp->tstamp) / HZ) 2444 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ; 2445 else 2446 stored_lft = 0; 2447 if (!update_lft && !create && stored_lft) { 2448 const u32 minimum_lft = min_t(u32, 2449 stored_lft, MIN_VALID_LIFETIME); 2450 valid_lft = max(valid_lft, minimum_lft); 2451 2452 /* RFC4862 Section 5.5.3e: 2453 * "Note that the preferred lifetime of the 2454 * corresponding address is always reset to 2455 * the Preferred Lifetime in the received 2456 * Prefix Information option, regardless of 2457 * whether the valid lifetime is also reset or 2458 * ignored." 2459 * 2460 * So we should always update prefered_lft here. 2461 */ 2462 update_lft = 1; 2463 } 2464 2465 if (update_lft) { 2466 ifp->valid_lft = valid_lft; 2467 ifp->prefered_lft = prefered_lft; 2468 ifp->tstamp = now; 2469 flags = ifp->flags; 2470 ifp->flags &= ~IFA_F_DEPRECATED; 2471 spin_unlock_bh(&ifp->lock); 2472 2473 if (!(flags&IFA_F_TENTATIVE)) 2474 ipv6_ifa_notify(0, ifp); 2475 } else 2476 spin_unlock_bh(&ifp->lock); 2477 2478 manage_tempaddrs(in6_dev, ifp, valid_lft, prefered_lft, 2479 create, now); 2480 2481 in6_ifa_put(ifp); 2482 addrconf_verify(); 2483 } 2484 2485 return 0; 2486 } 2487 EXPORT_SYMBOL_GPL(addrconf_prefix_rcv_add_addr); 2488 2489 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao) 2490 { 2491 struct prefix_info *pinfo; 2492 __u32 valid_lft; 2493 __u32 prefered_lft; 2494 int addr_type, err; 2495 u32 addr_flags = 0; 2496 struct inet6_dev *in6_dev; 2497 struct net *net = dev_net(dev); 2498 2499 pinfo = (struct prefix_info *) opt; 2500 2501 if (len < sizeof(struct prefix_info)) { 2502 ADBG("addrconf: prefix option too short\n"); 2503 return; 2504 } 2505 2506 /* 2507 * Validation checks ([ADDRCONF], page 19) 2508 */ 2509 2510 addr_type = ipv6_addr_type(&pinfo->prefix); 2511 2512 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL)) 2513 return; 2514 2515 valid_lft = ntohl(pinfo->valid); 2516 prefered_lft = ntohl(pinfo->prefered); 2517 2518 if (prefered_lft > valid_lft) { 2519 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n"); 2520 return; 2521 } 2522 2523 in6_dev = in6_dev_get(dev); 2524 2525 if (!in6_dev) { 2526 net_dbg_ratelimited("addrconf: device %s not configured\n", 2527 dev->name); 2528 return; 2529 } 2530 2531 /* 2532 * Two things going on here: 2533 * 1) Add routes for on-link prefixes 2534 * 2) Configure prefixes with the auto flag set 2535 */ 2536 2537 if (pinfo->onlink) { 2538 struct rt6_info *rt; 2539 unsigned long rt_expires; 2540 2541 /* Avoid arithmetic overflow. Really, we could 2542 * save rt_expires in seconds, likely valid_lft, 2543 * but it would require division in fib gc, that it 2544 * not good. 2545 */ 2546 if (HZ > USER_HZ) 2547 rt_expires = addrconf_timeout_fixup(valid_lft, HZ); 2548 else 2549 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ); 2550 2551 if (addrconf_finite_timeout(rt_expires)) 2552 rt_expires *= HZ; 2553 2554 rt = addrconf_get_prefix_route(&pinfo->prefix, 2555 pinfo->prefix_len, 2556 dev, 2557 RTF_ADDRCONF | RTF_PREFIX_RT, 2558 RTF_GATEWAY | RTF_DEFAULT); 2559 2560 if (rt) { 2561 /* Autoconf prefix route */ 2562 if (valid_lft == 0) { 2563 ip6_del_rt(rt); 2564 rt = NULL; 2565 } else if (addrconf_finite_timeout(rt_expires)) { 2566 /* not infinity */ 2567 rt6_set_expires(rt, jiffies + rt_expires); 2568 } else { 2569 rt6_clean_expires(rt); 2570 } 2571 } else if (valid_lft) { 2572 clock_t expires = 0; 2573 int flags = RTF_ADDRCONF | RTF_PREFIX_RT; 2574 if (addrconf_finite_timeout(rt_expires)) { 2575 /* not infinity */ 2576 flags |= RTF_EXPIRES; 2577 expires = jiffies_to_clock_t(rt_expires); 2578 } 2579 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len, 2580 dev, expires, flags); 2581 } 2582 ip6_rt_put(rt); 2583 } 2584 2585 /* Try to figure out our local address for this prefix */ 2586 2587 if (pinfo->autoconf && in6_dev->cnf.autoconf) { 2588 struct in6_addr addr; 2589 bool tokenized = false, dev_addr_generated = false; 2590 2591 if (pinfo->prefix_len == 64) { 2592 memcpy(&addr, &pinfo->prefix, 8); 2593 2594 if (!ipv6_addr_any(&in6_dev->token)) { 2595 read_lock_bh(&in6_dev->lock); 2596 memcpy(addr.s6_addr + 8, 2597 in6_dev->token.s6_addr + 8, 8); 2598 read_unlock_bh(&in6_dev->lock); 2599 tokenized = true; 2600 } else if (is_addr_mode_generate_stable(in6_dev) && 2601 !ipv6_generate_stable_address(&addr, 0, 2602 in6_dev)) { 2603 addr_flags |= IFA_F_STABLE_PRIVACY; 2604 goto ok; 2605 } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) && 2606 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) { 2607 goto put; 2608 } else { 2609 dev_addr_generated = true; 2610 } 2611 goto ok; 2612 } 2613 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n", 2614 pinfo->prefix_len); 2615 goto put; 2616 2617 ok: 2618 err = addrconf_prefix_rcv_add_addr(net, dev, pinfo, in6_dev, 2619 &addr, addr_type, 2620 addr_flags, sllao, 2621 tokenized, valid_lft, 2622 prefered_lft); 2623 if (err) 2624 goto put; 2625 2626 /* Ignore error case here because previous prefix add addr was 2627 * successful which will be notified. 2628 */ 2629 ndisc_ops_prefix_rcv_add_addr(net, dev, pinfo, in6_dev, &addr, 2630 addr_type, addr_flags, sllao, 2631 tokenized, valid_lft, 2632 prefered_lft, 2633 dev_addr_generated); 2634 } 2635 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo); 2636 put: 2637 in6_dev_put(in6_dev); 2638 } 2639 2640 /* 2641 * Set destination address. 2642 * Special case for SIT interfaces where we create a new "virtual" 2643 * device. 2644 */ 2645 int addrconf_set_dstaddr(struct net *net, void __user *arg) 2646 { 2647 struct in6_ifreq ireq; 2648 struct net_device *dev; 2649 int err = -EINVAL; 2650 2651 rtnl_lock(); 2652 2653 err = -EFAULT; 2654 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2655 goto err_exit; 2656 2657 dev = __dev_get_by_index(net, ireq.ifr6_ifindex); 2658 2659 err = -ENODEV; 2660 if (!dev) 2661 goto err_exit; 2662 2663 #if IS_ENABLED(CONFIG_IPV6_SIT) 2664 if (dev->type == ARPHRD_SIT) { 2665 const struct net_device_ops *ops = dev->netdev_ops; 2666 struct ifreq ifr; 2667 struct ip_tunnel_parm p; 2668 2669 err = -EADDRNOTAVAIL; 2670 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4)) 2671 goto err_exit; 2672 2673 memset(&p, 0, sizeof(p)); 2674 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3]; 2675 p.iph.saddr = 0; 2676 p.iph.version = 4; 2677 p.iph.ihl = 5; 2678 p.iph.protocol = IPPROTO_IPV6; 2679 p.iph.ttl = 64; 2680 ifr.ifr_ifru.ifru_data = (__force void __user *)&p; 2681 2682 if (ops->ndo_do_ioctl) { 2683 mm_segment_t oldfs = get_fs(); 2684 2685 set_fs(KERNEL_DS); 2686 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL); 2687 set_fs(oldfs); 2688 } else 2689 err = -EOPNOTSUPP; 2690 2691 if (err == 0) { 2692 err = -ENOBUFS; 2693 dev = __dev_get_by_name(net, p.name); 2694 if (!dev) 2695 goto err_exit; 2696 err = dev_open(dev); 2697 } 2698 } 2699 #endif 2700 2701 err_exit: 2702 rtnl_unlock(); 2703 return err; 2704 } 2705 2706 static int ipv6_mc_config(struct sock *sk, bool join, 2707 const struct in6_addr *addr, int ifindex) 2708 { 2709 int ret; 2710 2711 ASSERT_RTNL(); 2712 2713 lock_sock(sk); 2714 if (join) 2715 ret = ipv6_sock_mc_join(sk, ifindex, addr); 2716 else 2717 ret = ipv6_sock_mc_drop(sk, ifindex, addr); 2718 release_sock(sk); 2719 2720 return ret; 2721 } 2722 2723 /* 2724 * Manual configuration of address on an interface 2725 */ 2726 static int inet6_addr_add(struct net *net, int ifindex, 2727 const struct in6_addr *pfx, 2728 const struct in6_addr *peer_pfx, 2729 unsigned int plen, __u32 ifa_flags, 2730 __u32 prefered_lft, __u32 valid_lft) 2731 { 2732 struct inet6_ifaddr *ifp; 2733 struct inet6_dev *idev; 2734 struct net_device *dev; 2735 unsigned long timeout; 2736 clock_t expires; 2737 int scope; 2738 u32 flags; 2739 2740 ASSERT_RTNL(); 2741 2742 if (plen > 128) 2743 return -EINVAL; 2744 2745 /* check the lifetime */ 2746 if (!valid_lft || prefered_lft > valid_lft) 2747 return -EINVAL; 2748 2749 if (ifa_flags & IFA_F_MANAGETEMPADDR && plen != 64) 2750 return -EINVAL; 2751 2752 dev = __dev_get_by_index(net, ifindex); 2753 if (!dev) 2754 return -ENODEV; 2755 2756 idev = addrconf_add_dev(dev); 2757 if (IS_ERR(idev)) 2758 return PTR_ERR(idev); 2759 2760 if (ifa_flags & IFA_F_MCAUTOJOIN) { 2761 int ret = ipv6_mc_config(net->ipv6.mc_autojoin_sk, 2762 true, pfx, ifindex); 2763 2764 if (ret < 0) 2765 return ret; 2766 } 2767 2768 scope = ipv6_addr_scope(pfx); 2769 2770 timeout = addrconf_timeout_fixup(valid_lft, HZ); 2771 if (addrconf_finite_timeout(timeout)) { 2772 expires = jiffies_to_clock_t(timeout * HZ); 2773 valid_lft = timeout; 2774 flags = RTF_EXPIRES; 2775 } else { 2776 expires = 0; 2777 flags = 0; 2778 ifa_flags |= IFA_F_PERMANENT; 2779 } 2780 2781 timeout = addrconf_timeout_fixup(prefered_lft, HZ); 2782 if (addrconf_finite_timeout(timeout)) { 2783 if (timeout == 0) 2784 ifa_flags |= IFA_F_DEPRECATED; 2785 prefered_lft = timeout; 2786 } 2787 2788 ifp = ipv6_add_addr(idev, pfx, peer_pfx, plen, scope, ifa_flags, 2789 valid_lft, prefered_lft); 2790 2791 if (!IS_ERR(ifp)) { 2792 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) { 2793 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev, 2794 expires, flags); 2795 } 2796 2797 /* 2798 * Note that section 3.1 of RFC 4429 indicates 2799 * that the Optimistic flag should not be set for 2800 * manually configured addresses 2801 */ 2802 addrconf_dad_start(ifp); 2803 if (ifa_flags & IFA_F_MANAGETEMPADDR) 2804 manage_tempaddrs(idev, ifp, valid_lft, prefered_lft, 2805 true, jiffies); 2806 in6_ifa_put(ifp); 2807 addrconf_verify_rtnl(); 2808 return 0; 2809 } else if (ifa_flags & IFA_F_MCAUTOJOIN) { 2810 ipv6_mc_config(net->ipv6.mc_autojoin_sk, 2811 false, pfx, ifindex); 2812 } 2813 2814 return PTR_ERR(ifp); 2815 } 2816 2817 static int inet6_addr_del(struct net *net, int ifindex, u32 ifa_flags, 2818 const struct in6_addr *pfx, unsigned int plen) 2819 { 2820 struct inet6_ifaddr *ifp; 2821 struct inet6_dev *idev; 2822 struct net_device *dev; 2823 2824 if (plen > 128) 2825 return -EINVAL; 2826 2827 dev = __dev_get_by_index(net, ifindex); 2828 if (!dev) 2829 return -ENODEV; 2830 2831 idev = __in6_dev_get(dev); 2832 if (!idev) 2833 return -ENXIO; 2834 2835 read_lock_bh(&idev->lock); 2836 list_for_each_entry(ifp, &idev->addr_list, if_list) { 2837 if (ifp->prefix_len == plen && 2838 ipv6_addr_equal(pfx, &ifp->addr)) { 2839 in6_ifa_hold(ifp); 2840 read_unlock_bh(&idev->lock); 2841 2842 if (!(ifp->flags & IFA_F_TEMPORARY) && 2843 (ifa_flags & IFA_F_MANAGETEMPADDR)) 2844 manage_tempaddrs(idev, ifp, 0, 0, false, 2845 jiffies); 2846 ipv6_del_addr(ifp); 2847 addrconf_verify_rtnl(); 2848 if (ipv6_addr_is_multicast(pfx)) { 2849 ipv6_mc_config(net->ipv6.mc_autojoin_sk, 2850 false, pfx, dev->ifindex); 2851 } 2852 return 0; 2853 } 2854 } 2855 read_unlock_bh(&idev->lock); 2856 return -EADDRNOTAVAIL; 2857 } 2858 2859 2860 int addrconf_add_ifaddr(struct net *net, void __user *arg) 2861 { 2862 struct in6_ifreq ireq; 2863 int err; 2864 2865 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 2866 return -EPERM; 2867 2868 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2869 return -EFAULT; 2870 2871 rtnl_lock(); 2872 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, NULL, 2873 ireq.ifr6_prefixlen, IFA_F_PERMANENT, 2874 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME); 2875 rtnl_unlock(); 2876 return err; 2877 } 2878 2879 int addrconf_del_ifaddr(struct net *net, void __user *arg) 2880 { 2881 struct in6_ifreq ireq; 2882 int err; 2883 2884 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 2885 return -EPERM; 2886 2887 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2888 return -EFAULT; 2889 2890 rtnl_lock(); 2891 err = inet6_addr_del(net, ireq.ifr6_ifindex, 0, &ireq.ifr6_addr, 2892 ireq.ifr6_prefixlen); 2893 rtnl_unlock(); 2894 return err; 2895 } 2896 2897 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr, 2898 int plen, int scope) 2899 { 2900 struct inet6_ifaddr *ifp; 2901 2902 ifp = ipv6_add_addr(idev, addr, NULL, plen, 2903 scope, IFA_F_PERMANENT, 2904 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME); 2905 if (!IS_ERR(ifp)) { 2906 spin_lock_bh(&ifp->lock); 2907 ifp->flags &= ~IFA_F_TENTATIVE; 2908 spin_unlock_bh(&ifp->lock); 2909 rt_genid_bump_ipv6(dev_net(idev->dev)); 2910 ipv6_ifa_notify(RTM_NEWADDR, ifp); 2911 in6_ifa_put(ifp); 2912 } 2913 } 2914 2915 #if IS_ENABLED(CONFIG_IPV6_SIT) 2916 static void sit_add_v4_addrs(struct inet6_dev *idev) 2917 { 2918 struct in6_addr addr; 2919 struct net_device *dev; 2920 struct net *net = dev_net(idev->dev); 2921 int scope, plen; 2922 u32 pflags = 0; 2923 2924 ASSERT_RTNL(); 2925 2926 memset(&addr, 0, sizeof(struct in6_addr)); 2927 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4); 2928 2929 if (idev->dev->flags&IFF_POINTOPOINT) { 2930 addr.s6_addr32[0] = htonl(0xfe800000); 2931 scope = IFA_LINK; 2932 plen = 64; 2933 } else { 2934 scope = IPV6_ADDR_COMPATv4; 2935 plen = 96; 2936 pflags |= RTF_NONEXTHOP; 2937 } 2938 2939 if (addr.s6_addr32[3]) { 2940 add_addr(idev, &addr, plen, scope); 2941 addrconf_prefix_route(&addr, plen, idev->dev, 0, pflags); 2942 return; 2943 } 2944 2945 for_each_netdev(net, dev) { 2946 struct in_device *in_dev = __in_dev_get_rtnl(dev); 2947 if (in_dev && (dev->flags & IFF_UP)) { 2948 struct in_ifaddr *ifa; 2949 2950 int flag = scope; 2951 2952 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) { 2953 2954 addr.s6_addr32[3] = ifa->ifa_local; 2955 2956 if (ifa->ifa_scope == RT_SCOPE_LINK) 2957 continue; 2958 if (ifa->ifa_scope >= RT_SCOPE_HOST) { 2959 if (idev->dev->flags&IFF_POINTOPOINT) 2960 continue; 2961 flag |= IFA_HOST; 2962 } 2963 2964 add_addr(idev, &addr, plen, flag); 2965 addrconf_prefix_route(&addr, plen, idev->dev, 0, 2966 pflags); 2967 } 2968 } 2969 } 2970 } 2971 #endif 2972 2973 static void init_loopback(struct net_device *dev) 2974 { 2975 struct inet6_dev *idev; 2976 struct net_device *sp_dev; 2977 struct inet6_ifaddr *sp_ifa; 2978 struct rt6_info *sp_rt; 2979 2980 /* ::1 */ 2981 2982 ASSERT_RTNL(); 2983 2984 idev = ipv6_find_idev(dev); 2985 if (!idev) { 2986 pr_debug("%s: add_dev failed\n", __func__); 2987 return; 2988 } 2989 2990 add_addr(idev, &in6addr_loopback, 128, IFA_HOST); 2991 2992 /* Add routes to other interface's IPv6 addresses */ 2993 for_each_netdev(dev_net(dev), sp_dev) { 2994 if (!strcmp(sp_dev->name, dev->name)) 2995 continue; 2996 2997 idev = __in6_dev_get(sp_dev); 2998 if (!idev) 2999 continue; 3000 3001 read_lock_bh(&idev->lock); 3002 list_for_each_entry(sp_ifa, &idev->addr_list, if_list) { 3003 3004 if (sp_ifa->flags & (IFA_F_DADFAILED | IFA_F_TENTATIVE)) 3005 continue; 3006 3007 if (sp_ifa->rt) { 3008 /* This dst has been added to garbage list when 3009 * lo device down, release this obsolete dst and 3010 * reallocate a new router for ifa. 3011 */ 3012 if (!atomic_read(&sp_ifa->rt->rt6i_ref)) { 3013 ip6_rt_put(sp_ifa->rt); 3014 sp_ifa->rt = NULL; 3015 } else { 3016 continue; 3017 } 3018 } 3019 3020 sp_rt = addrconf_dst_alloc(idev, &sp_ifa->addr, false); 3021 3022 /* Failure cases are ignored */ 3023 if (!IS_ERR(sp_rt)) { 3024 sp_ifa->rt = sp_rt; 3025 ip6_ins_rt(sp_rt); 3026 } 3027 } 3028 read_unlock_bh(&idev->lock); 3029 } 3030 } 3031 3032 void addrconf_add_linklocal(struct inet6_dev *idev, 3033 const struct in6_addr *addr, u32 flags) 3034 { 3035 struct inet6_ifaddr *ifp; 3036 u32 addr_flags = flags | IFA_F_PERMANENT; 3037 3038 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 3039 if (idev->cnf.optimistic_dad && 3040 !dev_net(idev->dev)->ipv6.devconf_all->forwarding) 3041 addr_flags |= IFA_F_OPTIMISTIC; 3042 #endif 3043 3044 ifp = ipv6_add_addr(idev, addr, NULL, 64, IFA_LINK, addr_flags, 3045 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME); 3046 if (!IS_ERR(ifp)) { 3047 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0); 3048 addrconf_dad_start(ifp); 3049 in6_ifa_put(ifp); 3050 } 3051 } 3052 EXPORT_SYMBOL_GPL(addrconf_add_linklocal); 3053 3054 static bool ipv6_reserved_interfaceid(struct in6_addr address) 3055 { 3056 if ((address.s6_addr32[2] | address.s6_addr32[3]) == 0) 3057 return true; 3058 3059 if (address.s6_addr32[2] == htonl(0x02005eff) && 3060 ((address.s6_addr32[3] & htonl(0xfe000000)) == htonl(0xfe000000))) 3061 return true; 3062 3063 if (address.s6_addr32[2] == htonl(0xfdffffff) && 3064 ((address.s6_addr32[3] & htonl(0xffffff80)) == htonl(0xffffff80))) 3065 return true; 3066 3067 return false; 3068 } 3069 3070 static int ipv6_generate_stable_address(struct in6_addr *address, 3071 u8 dad_count, 3072 const struct inet6_dev *idev) 3073 { 3074 static DEFINE_SPINLOCK(lock); 3075 static __u32 digest[SHA_DIGEST_WORDS]; 3076 static __u32 workspace[SHA_WORKSPACE_WORDS]; 3077 3078 static union { 3079 char __data[SHA_MESSAGE_BYTES]; 3080 struct { 3081 struct in6_addr secret; 3082 __be32 prefix[2]; 3083 unsigned char hwaddr[MAX_ADDR_LEN]; 3084 u8 dad_count; 3085 } __packed; 3086 } data; 3087 3088 struct in6_addr secret; 3089 struct in6_addr temp; 3090 struct net *net = dev_net(idev->dev); 3091 3092 BUILD_BUG_ON(sizeof(data.__data) != sizeof(data)); 3093 3094 if (idev->cnf.stable_secret.initialized) 3095 secret = idev->cnf.stable_secret.secret; 3096 else if (net->ipv6.devconf_dflt->stable_secret.initialized) 3097 secret = net->ipv6.devconf_dflt->stable_secret.secret; 3098 else 3099 return -1; 3100 3101 retry: 3102 spin_lock_bh(&lock); 3103 3104 sha_init(digest); 3105 memset(&data, 0, sizeof(data)); 3106 memset(workspace, 0, sizeof(workspace)); 3107 memcpy(data.hwaddr, idev->dev->perm_addr, idev->dev->addr_len); 3108 data.prefix[0] = address->s6_addr32[0]; 3109 data.prefix[1] = address->s6_addr32[1]; 3110 data.secret = secret; 3111 data.dad_count = dad_count; 3112 3113 sha_transform(digest, data.__data, workspace); 3114 3115 temp = *address; 3116 temp.s6_addr32[2] = (__force __be32)digest[0]; 3117 temp.s6_addr32[3] = (__force __be32)digest[1]; 3118 3119 spin_unlock_bh(&lock); 3120 3121 if (ipv6_reserved_interfaceid(temp)) { 3122 dad_count++; 3123 if (dad_count > dev_net(idev->dev)->ipv6.sysctl.idgen_retries) 3124 return -1; 3125 goto retry; 3126 } 3127 3128 *address = temp; 3129 return 0; 3130 } 3131 3132 static void ipv6_gen_mode_random_init(struct inet6_dev *idev) 3133 { 3134 struct ipv6_stable_secret *s = &idev->cnf.stable_secret; 3135 3136 if (s->initialized) 3137 return; 3138 s = &idev->cnf.stable_secret; 3139 get_random_bytes(&s->secret, sizeof(s->secret)); 3140 s->initialized = true; 3141 } 3142 3143 static void addrconf_addr_gen(struct inet6_dev *idev, bool prefix_route) 3144 { 3145 struct in6_addr addr; 3146 3147 /* no link local addresses on L3 master devices */ 3148 if (netif_is_l3_master(idev->dev)) 3149 return; 3150 3151 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0); 3152 3153 switch (idev->addr_gen_mode) { 3154 case IN6_ADDR_GEN_MODE_RANDOM: 3155 ipv6_gen_mode_random_init(idev); 3156 /* fallthrough */ 3157 case IN6_ADDR_GEN_MODE_STABLE_PRIVACY: 3158 if (!ipv6_generate_stable_address(&addr, 0, idev)) 3159 addrconf_add_linklocal(idev, &addr, 3160 IFA_F_STABLE_PRIVACY); 3161 else if (prefix_route) 3162 addrconf_prefix_route(&addr, 64, idev->dev, 0, 0); 3163 break; 3164 case IN6_ADDR_GEN_MODE_EUI64: 3165 /* addrconf_add_linklocal also adds a prefix_route and we 3166 * only need to care about prefix routes if ipv6_generate_eui64 3167 * couldn't generate one. 3168 */ 3169 if (ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) == 0) 3170 addrconf_add_linklocal(idev, &addr, 0); 3171 else if (prefix_route) 3172 addrconf_prefix_route(&addr, 64, idev->dev, 0, 0); 3173 break; 3174 case IN6_ADDR_GEN_MODE_NONE: 3175 default: 3176 /* will not add any link local address */ 3177 break; 3178 } 3179 } 3180 3181 static void addrconf_dev_config(struct net_device *dev) 3182 { 3183 struct inet6_dev *idev; 3184 3185 ASSERT_RTNL(); 3186 3187 if ((dev->type != ARPHRD_ETHER) && 3188 (dev->type != ARPHRD_FDDI) && 3189 (dev->type != ARPHRD_ARCNET) && 3190 (dev->type != ARPHRD_INFINIBAND) && 3191 (dev->type != ARPHRD_IEEE1394) && 3192 (dev->type != ARPHRD_TUNNEL6) && 3193 (dev->type != ARPHRD_6LOWPAN) && 3194 (dev->type != ARPHRD_NONE)) { 3195 /* Alas, we support only Ethernet autoconfiguration. */ 3196 return; 3197 } 3198 3199 idev = addrconf_add_dev(dev); 3200 if (IS_ERR(idev)) 3201 return; 3202 3203 /* this device type has no EUI support */ 3204 if (dev->type == ARPHRD_NONE && 3205 idev->addr_gen_mode == IN6_ADDR_GEN_MODE_EUI64) 3206 idev->addr_gen_mode = IN6_ADDR_GEN_MODE_RANDOM; 3207 3208 addrconf_addr_gen(idev, false); 3209 } 3210 3211 #if IS_ENABLED(CONFIG_IPV6_SIT) 3212 static void addrconf_sit_config(struct net_device *dev) 3213 { 3214 struct inet6_dev *idev; 3215 3216 ASSERT_RTNL(); 3217 3218 /* 3219 * Configure the tunnel with one of our IPv4 3220 * addresses... we should configure all of 3221 * our v4 addrs in the tunnel 3222 */ 3223 3224 idev = ipv6_find_idev(dev); 3225 if (!idev) { 3226 pr_debug("%s: add_dev failed\n", __func__); 3227 return; 3228 } 3229 3230 if (dev->priv_flags & IFF_ISATAP) { 3231 addrconf_addr_gen(idev, false); 3232 return; 3233 } 3234 3235 sit_add_v4_addrs(idev); 3236 3237 if (dev->flags&IFF_POINTOPOINT) 3238 addrconf_add_mroute(dev); 3239 } 3240 #endif 3241 3242 #if IS_ENABLED(CONFIG_NET_IPGRE) 3243 static void addrconf_gre_config(struct net_device *dev) 3244 { 3245 struct inet6_dev *idev; 3246 3247 ASSERT_RTNL(); 3248 3249 idev = ipv6_find_idev(dev); 3250 if (!idev) { 3251 pr_debug("%s: add_dev failed\n", __func__); 3252 return; 3253 } 3254 3255 addrconf_addr_gen(idev, true); 3256 if (dev->flags & IFF_POINTOPOINT) 3257 addrconf_add_mroute(dev); 3258 } 3259 #endif 3260 3261 static int fixup_permanent_addr(struct inet6_dev *idev, 3262 struct inet6_ifaddr *ifp) 3263 { 3264 if (!ifp->rt) { 3265 struct rt6_info *rt; 3266 3267 rt = addrconf_dst_alloc(idev, &ifp->addr, false); 3268 if (unlikely(IS_ERR(rt))) 3269 return PTR_ERR(rt); 3270 3271 ifp->rt = rt; 3272 } 3273 3274 if (!(ifp->flags & IFA_F_NOPREFIXROUTE)) { 3275 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, 3276 idev->dev, 0, 0); 3277 } 3278 3279 addrconf_dad_start(ifp); 3280 3281 return 0; 3282 } 3283 3284 static void addrconf_permanent_addr(struct net_device *dev) 3285 { 3286 struct inet6_ifaddr *ifp, *tmp; 3287 struct inet6_dev *idev; 3288 3289 idev = __in6_dev_get(dev); 3290 if (!idev) 3291 return; 3292 3293 write_lock_bh(&idev->lock); 3294 3295 list_for_each_entry_safe(ifp, tmp, &idev->addr_list, if_list) { 3296 if ((ifp->flags & IFA_F_PERMANENT) && 3297 fixup_permanent_addr(idev, ifp) < 0) { 3298 write_unlock_bh(&idev->lock); 3299 ipv6_del_addr(ifp); 3300 write_lock_bh(&idev->lock); 3301 3302 net_info_ratelimited("%s: Failed to add prefix route for address %pI6c; dropping\n", 3303 idev->dev->name, &ifp->addr); 3304 } 3305 } 3306 3307 write_unlock_bh(&idev->lock); 3308 } 3309 3310 static int addrconf_notify(struct notifier_block *this, unsigned long event, 3311 void *ptr) 3312 { 3313 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 3314 struct netdev_notifier_changeupper_info *info; 3315 struct inet6_dev *idev = __in6_dev_get(dev); 3316 int run_pending = 0; 3317 int err; 3318 3319 switch (event) { 3320 case NETDEV_REGISTER: 3321 if (!idev && dev->mtu >= IPV6_MIN_MTU) { 3322 idev = ipv6_add_dev(dev); 3323 if (IS_ERR(idev)) 3324 return notifier_from_errno(PTR_ERR(idev)); 3325 } 3326 break; 3327 3328 case NETDEV_CHANGEMTU: 3329 /* if MTU under IPV6_MIN_MTU stop IPv6 on this interface. */ 3330 if (dev->mtu < IPV6_MIN_MTU) { 3331 addrconf_ifdown(dev, 1); 3332 break; 3333 } 3334 3335 if (idev) { 3336 rt6_mtu_change(dev, dev->mtu); 3337 idev->cnf.mtu6 = dev->mtu; 3338 break; 3339 } 3340 3341 /* allocate new idev */ 3342 idev = ipv6_add_dev(dev); 3343 if (IS_ERR(idev)) 3344 break; 3345 3346 /* device is still not ready */ 3347 if (!(idev->if_flags & IF_READY)) 3348 break; 3349 3350 run_pending = 1; 3351 3352 /* fall through */ 3353 3354 case NETDEV_UP: 3355 case NETDEV_CHANGE: 3356 if (dev->flags & IFF_SLAVE) 3357 break; 3358 3359 if (idev && idev->cnf.disable_ipv6) 3360 break; 3361 3362 if (event == NETDEV_UP) { 3363 /* restore routes for permanent addresses */ 3364 addrconf_permanent_addr(dev); 3365 3366 if (!addrconf_qdisc_ok(dev)) { 3367 /* device is not ready yet. */ 3368 pr_info("ADDRCONF(NETDEV_UP): %s: link is not ready\n", 3369 dev->name); 3370 break; 3371 } 3372 3373 if (!idev && dev->mtu >= IPV6_MIN_MTU) 3374 idev = ipv6_add_dev(dev); 3375 3376 if (!IS_ERR_OR_NULL(idev)) { 3377 idev->if_flags |= IF_READY; 3378 run_pending = 1; 3379 } 3380 } else if (event == NETDEV_CHANGE) { 3381 if (!addrconf_qdisc_ok(dev)) { 3382 /* device is still not ready. */ 3383 break; 3384 } 3385 3386 if (idev) { 3387 if (idev->if_flags & IF_READY) 3388 /* device is already configured. */ 3389 break; 3390 idev->if_flags |= IF_READY; 3391 } 3392 3393 pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n", 3394 dev->name); 3395 3396 run_pending = 1; 3397 } 3398 3399 switch (dev->type) { 3400 #if IS_ENABLED(CONFIG_IPV6_SIT) 3401 case ARPHRD_SIT: 3402 addrconf_sit_config(dev); 3403 break; 3404 #endif 3405 #if IS_ENABLED(CONFIG_NET_IPGRE) 3406 case ARPHRD_IPGRE: 3407 addrconf_gre_config(dev); 3408 break; 3409 #endif 3410 case ARPHRD_LOOPBACK: 3411 init_loopback(dev); 3412 break; 3413 3414 default: 3415 addrconf_dev_config(dev); 3416 break; 3417 } 3418 3419 if (!IS_ERR_OR_NULL(idev)) { 3420 if (run_pending) 3421 addrconf_dad_run(idev); 3422 3423 /* 3424 * If the MTU changed during the interface down, 3425 * when the interface up, the changed MTU must be 3426 * reflected in the idev as well as routers. 3427 */ 3428 if (idev->cnf.mtu6 != dev->mtu && 3429 dev->mtu >= IPV6_MIN_MTU) { 3430 rt6_mtu_change(dev, dev->mtu); 3431 idev->cnf.mtu6 = dev->mtu; 3432 } 3433 idev->tstamp = jiffies; 3434 inet6_ifinfo_notify(RTM_NEWLINK, idev); 3435 3436 /* 3437 * If the changed mtu during down is lower than 3438 * IPV6_MIN_MTU stop IPv6 on this interface. 3439 */ 3440 if (dev->mtu < IPV6_MIN_MTU) 3441 addrconf_ifdown(dev, 1); 3442 } 3443 break; 3444 3445 case NETDEV_DOWN: 3446 case NETDEV_UNREGISTER: 3447 /* 3448 * Remove all addresses from this interface. 3449 */ 3450 addrconf_ifdown(dev, event != NETDEV_DOWN); 3451 break; 3452 3453 case NETDEV_CHANGENAME: 3454 if (idev) { 3455 snmp6_unregister_dev(idev); 3456 addrconf_sysctl_unregister(idev); 3457 err = addrconf_sysctl_register(idev); 3458 if (err) 3459 return notifier_from_errno(err); 3460 err = snmp6_register_dev(idev); 3461 if (err) { 3462 addrconf_sysctl_unregister(idev); 3463 return notifier_from_errno(err); 3464 } 3465 } 3466 break; 3467 3468 case NETDEV_PRE_TYPE_CHANGE: 3469 case NETDEV_POST_TYPE_CHANGE: 3470 if (idev) 3471 addrconf_type_change(dev, event); 3472 break; 3473 3474 case NETDEV_CHANGEUPPER: 3475 info = ptr; 3476 3477 /* flush all routes if dev is linked to or unlinked from 3478 * an L3 master device (e.g., VRF) 3479 */ 3480 if (info->upper_dev && netif_is_l3_master(info->upper_dev)) 3481 addrconf_ifdown(dev, 0); 3482 } 3483 3484 return NOTIFY_OK; 3485 } 3486 3487 /* 3488 * addrconf module should be notified of a device going up 3489 */ 3490 static struct notifier_block ipv6_dev_notf = { 3491 .notifier_call = addrconf_notify, 3492 }; 3493 3494 static void addrconf_type_change(struct net_device *dev, unsigned long event) 3495 { 3496 struct inet6_dev *idev; 3497 ASSERT_RTNL(); 3498 3499 idev = __in6_dev_get(dev); 3500 3501 if (event == NETDEV_POST_TYPE_CHANGE) 3502 ipv6_mc_remap(idev); 3503 else if (event == NETDEV_PRE_TYPE_CHANGE) 3504 ipv6_mc_unmap(idev); 3505 } 3506 3507 static bool addr_is_local(const struct in6_addr *addr) 3508 { 3509 return ipv6_addr_type(addr) & 3510 (IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK); 3511 } 3512 3513 static int addrconf_ifdown(struct net_device *dev, int how) 3514 { 3515 struct net *net = dev_net(dev); 3516 struct inet6_dev *idev; 3517 struct inet6_ifaddr *ifa, *tmp; 3518 struct list_head del_list; 3519 int _keep_addr; 3520 bool keep_addr; 3521 int state, i; 3522 3523 ASSERT_RTNL(); 3524 3525 rt6_ifdown(net, dev); 3526 neigh_ifdown(&nd_tbl, dev); 3527 3528 idev = __in6_dev_get(dev); 3529 if (!idev) 3530 return -ENODEV; 3531 3532 /* 3533 * Step 1: remove reference to ipv6 device from parent device. 3534 * Do not dev_put! 3535 */ 3536 if (how) { 3537 idev->dead = 1; 3538 3539 /* protected by rtnl_lock */ 3540 RCU_INIT_POINTER(dev->ip6_ptr, NULL); 3541 3542 /* Step 1.5: remove snmp6 entry */ 3543 snmp6_unregister_dev(idev); 3544 3545 } 3546 3547 /* aggregate the system setting and interface setting */ 3548 _keep_addr = net->ipv6.devconf_all->keep_addr_on_down; 3549 if (!_keep_addr) 3550 _keep_addr = idev->cnf.keep_addr_on_down; 3551 3552 /* combine the user config with event to determine if permanent 3553 * addresses are to be removed from address hash table 3554 */ 3555 keep_addr = !(how || _keep_addr <= 0 || idev->cnf.disable_ipv6); 3556 3557 /* Step 2: clear hash table */ 3558 for (i = 0; i < IN6_ADDR_HSIZE; i++) { 3559 struct hlist_head *h = &inet6_addr_lst[i]; 3560 3561 spin_lock_bh(&addrconf_hash_lock); 3562 restart: 3563 hlist_for_each_entry_rcu(ifa, h, addr_lst) { 3564 if (ifa->idev == idev) { 3565 addrconf_del_dad_work(ifa); 3566 /* combined flag + permanent flag decide if 3567 * address is retained on a down event 3568 */ 3569 if (!keep_addr || 3570 !(ifa->flags & IFA_F_PERMANENT) || 3571 addr_is_local(&ifa->addr)) { 3572 hlist_del_init_rcu(&ifa->addr_lst); 3573 goto restart; 3574 } 3575 } 3576 } 3577 spin_unlock_bh(&addrconf_hash_lock); 3578 } 3579 3580 write_lock_bh(&idev->lock); 3581 3582 addrconf_del_rs_timer(idev); 3583 3584 /* Step 2: clear flags for stateless addrconf */ 3585 if (!how) 3586 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY); 3587 3588 /* Step 3: clear tempaddr list */ 3589 while (!list_empty(&idev->tempaddr_list)) { 3590 ifa = list_first_entry(&idev->tempaddr_list, 3591 struct inet6_ifaddr, tmp_list); 3592 list_del(&ifa->tmp_list); 3593 write_unlock_bh(&idev->lock); 3594 spin_lock_bh(&ifa->lock); 3595 3596 if (ifa->ifpub) { 3597 in6_ifa_put(ifa->ifpub); 3598 ifa->ifpub = NULL; 3599 } 3600 spin_unlock_bh(&ifa->lock); 3601 in6_ifa_put(ifa); 3602 write_lock_bh(&idev->lock); 3603 } 3604 3605 /* re-combine the user config with event to determine if permanent 3606 * addresses are to be removed from the interface list 3607 */ 3608 keep_addr = (!how && _keep_addr > 0 && !idev->cnf.disable_ipv6); 3609 3610 INIT_LIST_HEAD(&del_list); 3611 list_for_each_entry_safe(ifa, tmp, &idev->addr_list, if_list) { 3612 struct rt6_info *rt = NULL; 3613 3614 addrconf_del_dad_work(ifa); 3615 3616 write_unlock_bh(&idev->lock); 3617 spin_lock_bh(&ifa->lock); 3618 3619 if (keep_addr && (ifa->flags & IFA_F_PERMANENT) && 3620 !addr_is_local(&ifa->addr)) { 3621 /* set state to skip the notifier below */ 3622 state = INET6_IFADDR_STATE_DEAD; 3623 ifa->state = 0; 3624 if (!(ifa->flags & IFA_F_NODAD)) 3625 ifa->flags |= IFA_F_TENTATIVE; 3626 3627 rt = ifa->rt; 3628 ifa->rt = NULL; 3629 } else { 3630 state = ifa->state; 3631 ifa->state = INET6_IFADDR_STATE_DEAD; 3632 3633 list_move(&ifa->if_list, &del_list); 3634 } 3635 3636 spin_unlock_bh(&ifa->lock); 3637 3638 if (rt) 3639 ip6_del_rt(rt); 3640 3641 if (state != INET6_IFADDR_STATE_DEAD) { 3642 __ipv6_ifa_notify(RTM_DELADDR, ifa); 3643 inet6addr_notifier_call_chain(NETDEV_DOWN, ifa); 3644 } else { 3645 if (idev->cnf.forwarding) 3646 addrconf_leave_anycast(ifa); 3647 addrconf_leave_solict(ifa->idev, &ifa->addr); 3648 } 3649 3650 write_lock_bh(&idev->lock); 3651 } 3652 3653 write_unlock_bh(&idev->lock); 3654 3655 /* now clean up addresses to be removed */ 3656 while (!list_empty(&del_list)) { 3657 ifa = list_first_entry(&del_list, 3658 struct inet6_ifaddr, if_list); 3659 list_del(&ifa->if_list); 3660 3661 in6_ifa_put(ifa); 3662 } 3663 3664 /* Step 5: Discard anycast and multicast list */ 3665 if (how) { 3666 ipv6_ac_destroy_dev(idev); 3667 ipv6_mc_destroy_dev(idev); 3668 } else { 3669 ipv6_mc_down(idev); 3670 } 3671 3672 idev->tstamp = jiffies; 3673 3674 /* Last: Shot the device (if unregistered) */ 3675 if (how) { 3676 addrconf_sysctl_unregister(idev); 3677 neigh_parms_release(&nd_tbl, idev->nd_parms); 3678 neigh_ifdown(&nd_tbl, dev); 3679 in6_dev_put(idev); 3680 } 3681 return 0; 3682 } 3683 3684 static void addrconf_rs_timer(unsigned long data) 3685 { 3686 struct inet6_dev *idev = (struct inet6_dev *)data; 3687 struct net_device *dev = idev->dev; 3688 struct in6_addr lladdr; 3689 3690 write_lock(&idev->lock); 3691 if (idev->dead || !(idev->if_flags & IF_READY)) 3692 goto out; 3693 3694 if (!ipv6_accept_ra(idev)) 3695 goto out; 3696 3697 /* Announcement received after solicitation was sent */ 3698 if (idev->if_flags & IF_RA_RCVD) 3699 goto out; 3700 3701 if (idev->rs_probes++ < idev->cnf.rtr_solicits || idev->cnf.rtr_solicits < 0) { 3702 write_unlock(&idev->lock); 3703 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE)) 3704 ndisc_send_rs(dev, &lladdr, 3705 &in6addr_linklocal_allrouters); 3706 else 3707 goto put; 3708 3709 write_lock(&idev->lock); 3710 idev->rs_interval = rfc3315_s14_backoff_update( 3711 idev->rs_interval, idev->cnf.rtr_solicit_max_interval); 3712 /* The wait after the last probe can be shorter */ 3713 addrconf_mod_rs_timer(idev, (idev->rs_probes == 3714 idev->cnf.rtr_solicits) ? 3715 idev->cnf.rtr_solicit_delay : 3716 idev->rs_interval); 3717 } else { 3718 /* 3719 * Note: we do not support deprecated "all on-link" 3720 * assumption any longer. 3721 */ 3722 pr_debug("%s: no IPv6 routers present\n", idev->dev->name); 3723 } 3724 3725 out: 3726 write_unlock(&idev->lock); 3727 put: 3728 in6_dev_put(idev); 3729 } 3730 3731 /* 3732 * Duplicate Address Detection 3733 */ 3734 static void addrconf_dad_kick(struct inet6_ifaddr *ifp) 3735 { 3736 unsigned long rand_num; 3737 struct inet6_dev *idev = ifp->idev; 3738 3739 if (ifp->flags & IFA_F_OPTIMISTIC) 3740 rand_num = 0; 3741 else 3742 rand_num = prandom_u32() % (idev->cnf.rtr_solicit_delay ? : 1); 3743 3744 ifp->dad_probes = idev->cnf.dad_transmits; 3745 addrconf_mod_dad_work(ifp, rand_num); 3746 } 3747 3748 static void addrconf_dad_begin(struct inet6_ifaddr *ifp) 3749 { 3750 struct inet6_dev *idev = ifp->idev; 3751 struct net_device *dev = idev->dev; 3752 bool bump_id, notify = false; 3753 3754 addrconf_join_solict(dev, &ifp->addr); 3755 3756 prandom_seed((__force u32) ifp->addr.s6_addr32[3]); 3757 3758 read_lock_bh(&idev->lock); 3759 spin_lock(&ifp->lock); 3760 if (ifp->state == INET6_IFADDR_STATE_DEAD) 3761 goto out; 3762 3763 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) || 3764 idev->cnf.accept_dad < 1 || 3765 !(ifp->flags&IFA_F_TENTATIVE) || 3766 ifp->flags & IFA_F_NODAD) { 3767 bump_id = ifp->flags & IFA_F_TENTATIVE; 3768 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED); 3769 spin_unlock(&ifp->lock); 3770 read_unlock_bh(&idev->lock); 3771 3772 addrconf_dad_completed(ifp, bump_id); 3773 return; 3774 } 3775 3776 if (!(idev->if_flags & IF_READY)) { 3777 spin_unlock(&ifp->lock); 3778 read_unlock_bh(&idev->lock); 3779 /* 3780 * If the device is not ready: 3781 * - keep it tentative if it is a permanent address. 3782 * - otherwise, kill it. 3783 */ 3784 in6_ifa_hold(ifp); 3785 addrconf_dad_stop(ifp, 0); 3786 return; 3787 } 3788 3789 /* 3790 * Optimistic nodes can start receiving 3791 * Frames right away 3792 */ 3793 if (ifp->flags & IFA_F_OPTIMISTIC) { 3794 ip6_ins_rt(ifp->rt); 3795 if (ipv6_use_optimistic_addr(idev)) { 3796 /* Because optimistic nodes can use this address, 3797 * notify listeners. If DAD fails, RTM_DELADDR is sent. 3798 */ 3799 notify = true; 3800 } 3801 } 3802 3803 addrconf_dad_kick(ifp); 3804 out: 3805 spin_unlock(&ifp->lock); 3806 read_unlock_bh(&idev->lock); 3807 if (notify) 3808 ipv6_ifa_notify(RTM_NEWADDR, ifp); 3809 } 3810 3811 static void addrconf_dad_start(struct inet6_ifaddr *ifp) 3812 { 3813 bool begin_dad = false; 3814 3815 spin_lock_bh(&ifp->lock); 3816 if (ifp->state != INET6_IFADDR_STATE_DEAD) { 3817 ifp->state = INET6_IFADDR_STATE_PREDAD; 3818 begin_dad = true; 3819 } 3820 spin_unlock_bh(&ifp->lock); 3821 3822 if (begin_dad) 3823 addrconf_mod_dad_work(ifp, 0); 3824 } 3825 3826 static void addrconf_dad_work(struct work_struct *w) 3827 { 3828 struct inet6_ifaddr *ifp = container_of(to_delayed_work(w), 3829 struct inet6_ifaddr, 3830 dad_work); 3831 struct inet6_dev *idev = ifp->idev; 3832 bool bump_id, disable_ipv6 = false; 3833 struct in6_addr mcaddr; 3834 3835 enum { 3836 DAD_PROCESS, 3837 DAD_BEGIN, 3838 DAD_ABORT, 3839 } action = DAD_PROCESS; 3840 3841 rtnl_lock(); 3842 3843 spin_lock_bh(&ifp->lock); 3844 if (ifp->state == INET6_IFADDR_STATE_PREDAD) { 3845 action = DAD_BEGIN; 3846 ifp->state = INET6_IFADDR_STATE_DAD; 3847 } else if (ifp->state == INET6_IFADDR_STATE_ERRDAD) { 3848 action = DAD_ABORT; 3849 ifp->state = INET6_IFADDR_STATE_POSTDAD; 3850 3851 if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6 && 3852 !(ifp->flags & IFA_F_STABLE_PRIVACY)) { 3853 struct in6_addr addr; 3854 3855 addr.s6_addr32[0] = htonl(0xfe800000); 3856 addr.s6_addr32[1] = 0; 3857 3858 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) && 3859 ipv6_addr_equal(&ifp->addr, &addr)) { 3860 /* DAD failed for link-local based on MAC */ 3861 idev->cnf.disable_ipv6 = 1; 3862 3863 pr_info("%s: IPv6 being disabled!\n", 3864 ifp->idev->dev->name); 3865 disable_ipv6 = true; 3866 } 3867 } 3868 } 3869 spin_unlock_bh(&ifp->lock); 3870 3871 if (action == DAD_BEGIN) { 3872 addrconf_dad_begin(ifp); 3873 goto out; 3874 } else if (action == DAD_ABORT) { 3875 in6_ifa_hold(ifp); 3876 addrconf_dad_stop(ifp, 1); 3877 if (disable_ipv6) 3878 addrconf_ifdown(idev->dev, 0); 3879 goto out; 3880 } 3881 3882 if (!ifp->dad_probes && addrconf_dad_end(ifp)) 3883 goto out; 3884 3885 write_lock_bh(&idev->lock); 3886 if (idev->dead || !(idev->if_flags & IF_READY)) { 3887 write_unlock_bh(&idev->lock); 3888 goto out; 3889 } 3890 3891 spin_lock(&ifp->lock); 3892 if (ifp->state == INET6_IFADDR_STATE_DEAD) { 3893 spin_unlock(&ifp->lock); 3894 write_unlock_bh(&idev->lock); 3895 goto out; 3896 } 3897 3898 if (ifp->dad_probes == 0) { 3899 /* 3900 * DAD was successful 3901 */ 3902 3903 bump_id = ifp->flags & IFA_F_TENTATIVE; 3904 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED); 3905 spin_unlock(&ifp->lock); 3906 write_unlock_bh(&idev->lock); 3907 3908 addrconf_dad_completed(ifp, bump_id); 3909 3910 goto out; 3911 } 3912 3913 ifp->dad_probes--; 3914 addrconf_mod_dad_work(ifp, 3915 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME)); 3916 spin_unlock(&ifp->lock); 3917 write_unlock_bh(&idev->lock); 3918 3919 /* send a neighbour solicitation for our addr */ 3920 addrconf_addr_solict_mult(&ifp->addr, &mcaddr); 3921 ndisc_send_ns(ifp->idev->dev, &ifp->addr, &mcaddr, &in6addr_any); 3922 out: 3923 in6_ifa_put(ifp); 3924 rtnl_unlock(); 3925 } 3926 3927 /* ifp->idev must be at least read locked */ 3928 static bool ipv6_lonely_lladdr(struct inet6_ifaddr *ifp) 3929 { 3930 struct inet6_ifaddr *ifpiter; 3931 struct inet6_dev *idev = ifp->idev; 3932 3933 list_for_each_entry_reverse(ifpiter, &idev->addr_list, if_list) { 3934 if (ifpiter->scope > IFA_LINK) 3935 break; 3936 if (ifp != ifpiter && ifpiter->scope == IFA_LINK && 3937 (ifpiter->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE| 3938 IFA_F_OPTIMISTIC|IFA_F_DADFAILED)) == 3939 IFA_F_PERMANENT) 3940 return false; 3941 } 3942 return true; 3943 } 3944 3945 static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id) 3946 { 3947 struct net_device *dev = ifp->idev->dev; 3948 struct in6_addr lladdr; 3949 bool send_rs, send_mld; 3950 3951 addrconf_del_dad_work(ifp); 3952 3953 /* 3954 * Configure the address for reception. Now it is valid. 3955 */ 3956 3957 ipv6_ifa_notify(RTM_NEWADDR, ifp); 3958 3959 /* If added prefix is link local and we are prepared to process 3960 router advertisements, start sending router solicitations. 3961 */ 3962 3963 read_lock_bh(&ifp->idev->lock); 3964 send_mld = ifp->scope == IFA_LINK && ipv6_lonely_lladdr(ifp); 3965 send_rs = send_mld && 3966 ipv6_accept_ra(ifp->idev) && 3967 ifp->idev->cnf.rtr_solicits != 0 && 3968 (dev->flags&IFF_LOOPBACK) == 0; 3969 read_unlock_bh(&ifp->idev->lock); 3970 3971 /* While dad is in progress mld report's source address is in6_addrany. 3972 * Resend with proper ll now. 3973 */ 3974 if (send_mld) 3975 ipv6_mc_dad_complete(ifp->idev); 3976 3977 if (send_rs) { 3978 /* 3979 * If a host as already performed a random delay 3980 * [...] as part of DAD [...] there is no need 3981 * to delay again before sending the first RS 3982 */ 3983 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE)) 3984 return; 3985 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters); 3986 3987 write_lock_bh(&ifp->idev->lock); 3988 spin_lock(&ifp->lock); 3989 ifp->idev->rs_interval = rfc3315_s14_backoff_init( 3990 ifp->idev->cnf.rtr_solicit_interval); 3991 ifp->idev->rs_probes = 1; 3992 ifp->idev->if_flags |= IF_RS_SENT; 3993 addrconf_mod_rs_timer(ifp->idev, ifp->idev->rs_interval); 3994 spin_unlock(&ifp->lock); 3995 write_unlock_bh(&ifp->idev->lock); 3996 } 3997 3998 if (bump_id) 3999 rt_genid_bump_ipv6(dev_net(dev)); 4000 } 4001 4002 static void addrconf_dad_run(struct inet6_dev *idev) 4003 { 4004 struct inet6_ifaddr *ifp; 4005 4006 read_lock_bh(&idev->lock); 4007 list_for_each_entry(ifp, &idev->addr_list, if_list) { 4008 spin_lock(&ifp->lock); 4009 if (ifp->flags & IFA_F_TENTATIVE && 4010 ifp->state == INET6_IFADDR_STATE_DAD) 4011 addrconf_dad_kick(ifp); 4012 spin_unlock(&ifp->lock); 4013 } 4014 read_unlock_bh(&idev->lock); 4015 } 4016 4017 #ifdef CONFIG_PROC_FS 4018 struct if6_iter_state { 4019 struct seq_net_private p; 4020 int bucket; 4021 int offset; 4022 }; 4023 4024 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos) 4025 { 4026 struct inet6_ifaddr *ifa = NULL; 4027 struct if6_iter_state *state = seq->private; 4028 struct net *net = seq_file_net(seq); 4029 int p = 0; 4030 4031 /* initial bucket if pos is 0 */ 4032 if (pos == 0) { 4033 state->bucket = 0; 4034 state->offset = 0; 4035 } 4036 4037 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) { 4038 hlist_for_each_entry_rcu_bh(ifa, &inet6_addr_lst[state->bucket], 4039 addr_lst) { 4040 if (!net_eq(dev_net(ifa->idev->dev), net)) 4041 continue; 4042 /* sync with offset */ 4043 if (p < state->offset) { 4044 p++; 4045 continue; 4046 } 4047 state->offset++; 4048 return ifa; 4049 } 4050 4051 /* prepare for next bucket */ 4052 state->offset = 0; 4053 p = 0; 4054 } 4055 return NULL; 4056 } 4057 4058 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, 4059 struct inet6_ifaddr *ifa) 4060 { 4061 struct if6_iter_state *state = seq->private; 4062 struct net *net = seq_file_net(seq); 4063 4064 hlist_for_each_entry_continue_rcu_bh(ifa, addr_lst) { 4065 if (!net_eq(dev_net(ifa->idev->dev), net)) 4066 continue; 4067 state->offset++; 4068 return ifa; 4069 } 4070 4071 while (++state->bucket < IN6_ADDR_HSIZE) { 4072 state->offset = 0; 4073 hlist_for_each_entry_rcu_bh(ifa, 4074 &inet6_addr_lst[state->bucket], addr_lst) { 4075 if (!net_eq(dev_net(ifa->idev->dev), net)) 4076 continue; 4077 state->offset++; 4078 return ifa; 4079 } 4080 } 4081 4082 return NULL; 4083 } 4084 4085 static void *if6_seq_start(struct seq_file *seq, loff_t *pos) 4086 __acquires(rcu_bh) 4087 { 4088 rcu_read_lock_bh(); 4089 return if6_get_first(seq, *pos); 4090 } 4091 4092 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos) 4093 { 4094 struct inet6_ifaddr *ifa; 4095 4096 ifa = if6_get_next(seq, v); 4097 ++*pos; 4098 return ifa; 4099 } 4100 4101 static void if6_seq_stop(struct seq_file *seq, void *v) 4102 __releases(rcu_bh) 4103 { 4104 rcu_read_unlock_bh(); 4105 } 4106 4107 static int if6_seq_show(struct seq_file *seq, void *v) 4108 { 4109 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v; 4110 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n", 4111 &ifp->addr, 4112 ifp->idev->dev->ifindex, 4113 ifp->prefix_len, 4114 ifp->scope, 4115 (u8) ifp->flags, 4116 ifp->idev->dev->name); 4117 return 0; 4118 } 4119 4120 static const struct seq_operations if6_seq_ops = { 4121 .start = if6_seq_start, 4122 .next = if6_seq_next, 4123 .show = if6_seq_show, 4124 .stop = if6_seq_stop, 4125 }; 4126 4127 static int if6_seq_open(struct inode *inode, struct file *file) 4128 { 4129 return seq_open_net(inode, file, &if6_seq_ops, 4130 sizeof(struct if6_iter_state)); 4131 } 4132 4133 static const struct file_operations if6_fops = { 4134 .owner = THIS_MODULE, 4135 .open = if6_seq_open, 4136 .read = seq_read, 4137 .llseek = seq_lseek, 4138 .release = seq_release_net, 4139 }; 4140 4141 static int __net_init if6_proc_net_init(struct net *net) 4142 { 4143 if (!proc_create("if_inet6", S_IRUGO, net->proc_net, &if6_fops)) 4144 return -ENOMEM; 4145 return 0; 4146 } 4147 4148 static void __net_exit if6_proc_net_exit(struct net *net) 4149 { 4150 remove_proc_entry("if_inet6", net->proc_net); 4151 } 4152 4153 static struct pernet_operations if6_proc_net_ops = { 4154 .init = if6_proc_net_init, 4155 .exit = if6_proc_net_exit, 4156 }; 4157 4158 int __init if6_proc_init(void) 4159 { 4160 return register_pernet_subsys(&if6_proc_net_ops); 4161 } 4162 4163 void if6_proc_exit(void) 4164 { 4165 unregister_pernet_subsys(&if6_proc_net_ops); 4166 } 4167 #endif /* CONFIG_PROC_FS */ 4168 4169 #if IS_ENABLED(CONFIG_IPV6_MIP6) 4170 /* Check if address is a home address configured on any interface. */ 4171 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr) 4172 { 4173 int ret = 0; 4174 struct inet6_ifaddr *ifp = NULL; 4175 unsigned int hash = inet6_addr_hash(addr); 4176 4177 rcu_read_lock_bh(); 4178 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) { 4179 if (!net_eq(dev_net(ifp->idev->dev), net)) 4180 continue; 4181 if (ipv6_addr_equal(&ifp->addr, addr) && 4182 (ifp->flags & IFA_F_HOMEADDRESS)) { 4183 ret = 1; 4184 break; 4185 } 4186 } 4187 rcu_read_unlock_bh(); 4188 return ret; 4189 } 4190 #endif 4191 4192 /* 4193 * Periodic address status verification 4194 */ 4195 4196 static void addrconf_verify_rtnl(void) 4197 { 4198 unsigned long now, next, next_sec, next_sched; 4199 struct inet6_ifaddr *ifp; 4200 int i; 4201 4202 ASSERT_RTNL(); 4203 4204 rcu_read_lock_bh(); 4205 now = jiffies; 4206 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY); 4207 4208 cancel_delayed_work(&addr_chk_work); 4209 4210 for (i = 0; i < IN6_ADDR_HSIZE; i++) { 4211 restart: 4212 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[i], addr_lst) { 4213 unsigned long age; 4214 4215 /* When setting preferred_lft to a value not zero or 4216 * infinity, while valid_lft is infinity 4217 * IFA_F_PERMANENT has a non-infinity life time. 4218 */ 4219 if ((ifp->flags & IFA_F_PERMANENT) && 4220 (ifp->prefered_lft == INFINITY_LIFE_TIME)) 4221 continue; 4222 4223 spin_lock(&ifp->lock); 4224 /* We try to batch several events at once. */ 4225 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ; 4226 4227 if (ifp->valid_lft != INFINITY_LIFE_TIME && 4228 age >= ifp->valid_lft) { 4229 spin_unlock(&ifp->lock); 4230 in6_ifa_hold(ifp); 4231 ipv6_del_addr(ifp); 4232 goto restart; 4233 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) { 4234 spin_unlock(&ifp->lock); 4235 continue; 4236 } else if (age >= ifp->prefered_lft) { 4237 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */ 4238 int deprecate = 0; 4239 4240 if (!(ifp->flags&IFA_F_DEPRECATED)) { 4241 deprecate = 1; 4242 ifp->flags |= IFA_F_DEPRECATED; 4243 } 4244 4245 if ((ifp->valid_lft != INFINITY_LIFE_TIME) && 4246 (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))) 4247 next = ifp->tstamp + ifp->valid_lft * HZ; 4248 4249 spin_unlock(&ifp->lock); 4250 4251 if (deprecate) { 4252 in6_ifa_hold(ifp); 4253 4254 ipv6_ifa_notify(0, ifp); 4255 in6_ifa_put(ifp); 4256 goto restart; 4257 } 4258 } else if ((ifp->flags&IFA_F_TEMPORARY) && 4259 !(ifp->flags&IFA_F_TENTATIVE)) { 4260 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry * 4261 ifp->idev->cnf.dad_transmits * 4262 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME) / HZ; 4263 4264 if (age >= ifp->prefered_lft - regen_advance) { 4265 struct inet6_ifaddr *ifpub = ifp->ifpub; 4266 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 4267 next = ifp->tstamp + ifp->prefered_lft * HZ; 4268 if (!ifp->regen_count && ifpub) { 4269 ifp->regen_count++; 4270 in6_ifa_hold(ifp); 4271 in6_ifa_hold(ifpub); 4272 spin_unlock(&ifp->lock); 4273 4274 spin_lock(&ifpub->lock); 4275 ifpub->regen_count = 0; 4276 spin_unlock(&ifpub->lock); 4277 ipv6_create_tempaddr(ifpub, ifp); 4278 in6_ifa_put(ifpub); 4279 in6_ifa_put(ifp); 4280 goto restart; 4281 } 4282 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next)) 4283 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ; 4284 spin_unlock(&ifp->lock); 4285 } else { 4286 /* ifp->prefered_lft <= ifp->valid_lft */ 4287 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 4288 next = ifp->tstamp + ifp->prefered_lft * HZ; 4289 spin_unlock(&ifp->lock); 4290 } 4291 } 4292 } 4293 4294 next_sec = round_jiffies_up(next); 4295 next_sched = next; 4296 4297 /* If rounded timeout is accurate enough, accept it. */ 4298 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ)) 4299 next_sched = next_sec; 4300 4301 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */ 4302 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX)) 4303 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX; 4304 4305 ADBG(KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n", 4306 now, next, next_sec, next_sched); 4307 mod_delayed_work(addrconf_wq, &addr_chk_work, next_sched - now); 4308 rcu_read_unlock_bh(); 4309 } 4310 4311 static void addrconf_verify_work(struct work_struct *w) 4312 { 4313 rtnl_lock(); 4314 addrconf_verify_rtnl(); 4315 rtnl_unlock(); 4316 } 4317 4318 static void addrconf_verify(void) 4319 { 4320 mod_delayed_work(addrconf_wq, &addr_chk_work, 0); 4321 } 4322 4323 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local, 4324 struct in6_addr **peer_pfx) 4325 { 4326 struct in6_addr *pfx = NULL; 4327 4328 *peer_pfx = NULL; 4329 4330 if (addr) 4331 pfx = nla_data(addr); 4332 4333 if (local) { 4334 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx))) 4335 *peer_pfx = pfx; 4336 pfx = nla_data(local); 4337 } 4338 4339 return pfx; 4340 } 4341 4342 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = { 4343 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) }, 4344 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) }, 4345 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) }, 4346 [IFA_FLAGS] = { .len = sizeof(u32) }, 4347 }; 4348 4349 static int 4350 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh) 4351 { 4352 struct net *net = sock_net(skb->sk); 4353 struct ifaddrmsg *ifm; 4354 struct nlattr *tb[IFA_MAX+1]; 4355 struct in6_addr *pfx, *peer_pfx; 4356 u32 ifa_flags; 4357 int err; 4358 4359 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy); 4360 if (err < 0) 4361 return err; 4362 4363 ifm = nlmsg_data(nlh); 4364 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx); 4365 if (!pfx) 4366 return -EINVAL; 4367 4368 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags; 4369 4370 /* We ignore other flags so far. */ 4371 ifa_flags &= IFA_F_MANAGETEMPADDR; 4372 4373 return inet6_addr_del(net, ifm->ifa_index, ifa_flags, pfx, 4374 ifm->ifa_prefixlen); 4375 } 4376 4377 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u32 ifa_flags, 4378 u32 prefered_lft, u32 valid_lft) 4379 { 4380 u32 flags; 4381 clock_t expires; 4382 unsigned long timeout; 4383 bool was_managetempaddr; 4384 bool had_prefixroute; 4385 4386 ASSERT_RTNL(); 4387 4388 if (!valid_lft || (prefered_lft > valid_lft)) 4389 return -EINVAL; 4390 4391 if (ifa_flags & IFA_F_MANAGETEMPADDR && 4392 (ifp->flags & IFA_F_TEMPORARY || ifp->prefix_len != 64)) 4393 return -EINVAL; 4394 4395 timeout = addrconf_timeout_fixup(valid_lft, HZ); 4396 if (addrconf_finite_timeout(timeout)) { 4397 expires = jiffies_to_clock_t(timeout * HZ); 4398 valid_lft = timeout; 4399 flags = RTF_EXPIRES; 4400 } else { 4401 expires = 0; 4402 flags = 0; 4403 ifa_flags |= IFA_F_PERMANENT; 4404 } 4405 4406 timeout = addrconf_timeout_fixup(prefered_lft, HZ); 4407 if (addrconf_finite_timeout(timeout)) { 4408 if (timeout == 0) 4409 ifa_flags |= IFA_F_DEPRECATED; 4410 prefered_lft = timeout; 4411 } 4412 4413 spin_lock_bh(&ifp->lock); 4414 was_managetempaddr = ifp->flags & IFA_F_MANAGETEMPADDR; 4415 had_prefixroute = ifp->flags & IFA_F_PERMANENT && 4416 !(ifp->flags & IFA_F_NOPREFIXROUTE); 4417 ifp->flags &= ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | 4418 IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR | 4419 IFA_F_NOPREFIXROUTE); 4420 ifp->flags |= ifa_flags; 4421 ifp->tstamp = jiffies; 4422 ifp->valid_lft = valid_lft; 4423 ifp->prefered_lft = prefered_lft; 4424 4425 spin_unlock_bh(&ifp->lock); 4426 if (!(ifp->flags&IFA_F_TENTATIVE)) 4427 ipv6_ifa_notify(0, ifp); 4428 4429 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) { 4430 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev, 4431 expires, flags); 4432 } else if (had_prefixroute) { 4433 enum cleanup_prefix_rt_t action; 4434 unsigned long rt_expires; 4435 4436 write_lock_bh(&ifp->idev->lock); 4437 action = check_cleanup_prefix_route(ifp, &rt_expires); 4438 write_unlock_bh(&ifp->idev->lock); 4439 4440 if (action != CLEANUP_PREFIX_RT_NOP) { 4441 cleanup_prefix_route(ifp, rt_expires, 4442 action == CLEANUP_PREFIX_RT_DEL); 4443 } 4444 } 4445 4446 if (was_managetempaddr || ifp->flags & IFA_F_MANAGETEMPADDR) { 4447 if (was_managetempaddr && !(ifp->flags & IFA_F_MANAGETEMPADDR)) 4448 valid_lft = prefered_lft = 0; 4449 manage_tempaddrs(ifp->idev, ifp, valid_lft, prefered_lft, 4450 !was_managetempaddr, jiffies); 4451 } 4452 4453 addrconf_verify_rtnl(); 4454 4455 return 0; 4456 } 4457 4458 static int 4459 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh) 4460 { 4461 struct net *net = sock_net(skb->sk); 4462 struct ifaddrmsg *ifm; 4463 struct nlattr *tb[IFA_MAX+1]; 4464 struct in6_addr *pfx, *peer_pfx; 4465 struct inet6_ifaddr *ifa; 4466 struct net_device *dev; 4467 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME; 4468 u32 ifa_flags; 4469 int err; 4470 4471 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy); 4472 if (err < 0) 4473 return err; 4474 4475 ifm = nlmsg_data(nlh); 4476 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx); 4477 if (!pfx) 4478 return -EINVAL; 4479 4480 if (tb[IFA_CACHEINFO]) { 4481 struct ifa_cacheinfo *ci; 4482 4483 ci = nla_data(tb[IFA_CACHEINFO]); 4484 valid_lft = ci->ifa_valid; 4485 preferred_lft = ci->ifa_prefered; 4486 } else { 4487 preferred_lft = INFINITY_LIFE_TIME; 4488 valid_lft = INFINITY_LIFE_TIME; 4489 } 4490 4491 dev = __dev_get_by_index(net, ifm->ifa_index); 4492 if (!dev) 4493 return -ENODEV; 4494 4495 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags; 4496 4497 /* We ignore other flags so far. */ 4498 ifa_flags &= IFA_F_NODAD | IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR | 4499 IFA_F_NOPREFIXROUTE | IFA_F_MCAUTOJOIN; 4500 4501 ifa = ipv6_get_ifaddr(net, pfx, dev, 1); 4502 if (!ifa) { 4503 /* 4504 * It would be best to check for !NLM_F_CREATE here but 4505 * userspace already relies on not having to provide this. 4506 */ 4507 return inet6_addr_add(net, ifm->ifa_index, pfx, peer_pfx, 4508 ifm->ifa_prefixlen, ifa_flags, 4509 preferred_lft, valid_lft); 4510 } 4511 4512 if (nlh->nlmsg_flags & NLM_F_EXCL || 4513 !(nlh->nlmsg_flags & NLM_F_REPLACE)) 4514 err = -EEXIST; 4515 else 4516 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft); 4517 4518 in6_ifa_put(ifa); 4519 4520 return err; 4521 } 4522 4523 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u32 flags, 4524 u8 scope, int ifindex) 4525 { 4526 struct ifaddrmsg *ifm; 4527 4528 ifm = nlmsg_data(nlh); 4529 ifm->ifa_family = AF_INET6; 4530 ifm->ifa_prefixlen = prefixlen; 4531 ifm->ifa_flags = flags; 4532 ifm->ifa_scope = scope; 4533 ifm->ifa_index = ifindex; 4534 } 4535 4536 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp, 4537 unsigned long tstamp, u32 preferred, u32 valid) 4538 { 4539 struct ifa_cacheinfo ci; 4540 4541 ci.cstamp = cstamp_delta(cstamp); 4542 ci.tstamp = cstamp_delta(tstamp); 4543 ci.ifa_prefered = preferred; 4544 ci.ifa_valid = valid; 4545 4546 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci); 4547 } 4548 4549 static inline int rt_scope(int ifa_scope) 4550 { 4551 if (ifa_scope & IFA_HOST) 4552 return RT_SCOPE_HOST; 4553 else if (ifa_scope & IFA_LINK) 4554 return RT_SCOPE_LINK; 4555 else if (ifa_scope & IFA_SITE) 4556 return RT_SCOPE_SITE; 4557 else 4558 return RT_SCOPE_UNIVERSE; 4559 } 4560 4561 static inline int inet6_ifaddr_msgsize(void) 4562 { 4563 return NLMSG_ALIGN(sizeof(struct ifaddrmsg)) 4564 + nla_total_size(16) /* IFA_LOCAL */ 4565 + nla_total_size(16) /* IFA_ADDRESS */ 4566 + nla_total_size(sizeof(struct ifa_cacheinfo)) 4567 + nla_total_size(4) /* IFA_FLAGS */; 4568 } 4569 4570 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa, 4571 u32 portid, u32 seq, int event, unsigned int flags) 4572 { 4573 struct nlmsghdr *nlh; 4574 u32 preferred, valid; 4575 4576 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags); 4577 if (!nlh) 4578 return -EMSGSIZE; 4579 4580 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope), 4581 ifa->idev->dev->ifindex); 4582 4583 if (!((ifa->flags&IFA_F_PERMANENT) && 4584 (ifa->prefered_lft == INFINITY_LIFE_TIME))) { 4585 preferred = ifa->prefered_lft; 4586 valid = ifa->valid_lft; 4587 if (preferred != INFINITY_LIFE_TIME) { 4588 long tval = (jiffies - ifa->tstamp)/HZ; 4589 if (preferred > tval) 4590 preferred -= tval; 4591 else 4592 preferred = 0; 4593 if (valid != INFINITY_LIFE_TIME) { 4594 if (valid > tval) 4595 valid -= tval; 4596 else 4597 valid = 0; 4598 } 4599 } 4600 } else { 4601 preferred = INFINITY_LIFE_TIME; 4602 valid = INFINITY_LIFE_TIME; 4603 } 4604 4605 if (!ipv6_addr_any(&ifa->peer_addr)) { 4606 if (nla_put_in6_addr(skb, IFA_LOCAL, &ifa->addr) < 0 || 4607 nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->peer_addr) < 0) 4608 goto error; 4609 } else 4610 if (nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->addr) < 0) 4611 goto error; 4612 4613 if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) 4614 goto error; 4615 4616 if (nla_put_u32(skb, IFA_FLAGS, ifa->flags) < 0) 4617 goto error; 4618 4619 nlmsg_end(skb, nlh); 4620 return 0; 4621 4622 error: 4623 nlmsg_cancel(skb, nlh); 4624 return -EMSGSIZE; 4625 } 4626 4627 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca, 4628 u32 portid, u32 seq, int event, u16 flags) 4629 { 4630 struct nlmsghdr *nlh; 4631 u8 scope = RT_SCOPE_UNIVERSE; 4632 int ifindex = ifmca->idev->dev->ifindex; 4633 4634 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE) 4635 scope = RT_SCOPE_SITE; 4636 4637 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags); 4638 if (!nlh) 4639 return -EMSGSIZE; 4640 4641 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 4642 if (nla_put_in6_addr(skb, IFA_MULTICAST, &ifmca->mca_addr) < 0 || 4643 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp, 4644 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 4645 nlmsg_cancel(skb, nlh); 4646 return -EMSGSIZE; 4647 } 4648 4649 nlmsg_end(skb, nlh); 4650 return 0; 4651 } 4652 4653 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca, 4654 u32 portid, u32 seq, int event, unsigned int flags) 4655 { 4656 struct nlmsghdr *nlh; 4657 u8 scope = RT_SCOPE_UNIVERSE; 4658 int ifindex = ifaca->aca_idev->dev->ifindex; 4659 4660 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE) 4661 scope = RT_SCOPE_SITE; 4662 4663 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags); 4664 if (!nlh) 4665 return -EMSGSIZE; 4666 4667 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 4668 if (nla_put_in6_addr(skb, IFA_ANYCAST, &ifaca->aca_addr) < 0 || 4669 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp, 4670 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 4671 nlmsg_cancel(skb, nlh); 4672 return -EMSGSIZE; 4673 } 4674 4675 nlmsg_end(skb, nlh); 4676 return 0; 4677 } 4678 4679 enum addr_type_t { 4680 UNICAST_ADDR, 4681 MULTICAST_ADDR, 4682 ANYCAST_ADDR, 4683 }; 4684 4685 /* called with rcu_read_lock() */ 4686 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb, 4687 struct netlink_callback *cb, enum addr_type_t type, 4688 int s_ip_idx, int *p_ip_idx) 4689 { 4690 struct ifmcaddr6 *ifmca; 4691 struct ifacaddr6 *ifaca; 4692 int err = 1; 4693 int ip_idx = *p_ip_idx; 4694 4695 read_lock_bh(&idev->lock); 4696 switch (type) { 4697 case UNICAST_ADDR: { 4698 struct inet6_ifaddr *ifa; 4699 4700 /* unicast address incl. temp addr */ 4701 list_for_each_entry(ifa, &idev->addr_list, if_list) { 4702 if (++ip_idx < s_ip_idx) 4703 continue; 4704 err = inet6_fill_ifaddr(skb, ifa, 4705 NETLINK_CB(cb->skb).portid, 4706 cb->nlh->nlmsg_seq, 4707 RTM_NEWADDR, 4708 NLM_F_MULTI); 4709 if (err < 0) 4710 break; 4711 nl_dump_check_consistent(cb, nlmsg_hdr(skb)); 4712 } 4713 break; 4714 } 4715 case MULTICAST_ADDR: 4716 /* multicast address */ 4717 for (ifmca = idev->mc_list; ifmca; 4718 ifmca = ifmca->next, ip_idx++) { 4719 if (ip_idx < s_ip_idx) 4720 continue; 4721 err = inet6_fill_ifmcaddr(skb, ifmca, 4722 NETLINK_CB(cb->skb).portid, 4723 cb->nlh->nlmsg_seq, 4724 RTM_GETMULTICAST, 4725 NLM_F_MULTI); 4726 if (err < 0) 4727 break; 4728 } 4729 break; 4730 case ANYCAST_ADDR: 4731 /* anycast address */ 4732 for (ifaca = idev->ac_list; ifaca; 4733 ifaca = ifaca->aca_next, ip_idx++) { 4734 if (ip_idx < s_ip_idx) 4735 continue; 4736 err = inet6_fill_ifacaddr(skb, ifaca, 4737 NETLINK_CB(cb->skb).portid, 4738 cb->nlh->nlmsg_seq, 4739 RTM_GETANYCAST, 4740 NLM_F_MULTI); 4741 if (err < 0) 4742 break; 4743 } 4744 break; 4745 default: 4746 break; 4747 } 4748 read_unlock_bh(&idev->lock); 4749 *p_ip_idx = ip_idx; 4750 return err; 4751 } 4752 4753 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb, 4754 enum addr_type_t type) 4755 { 4756 struct net *net = sock_net(skb->sk); 4757 int h, s_h; 4758 int idx, ip_idx; 4759 int s_idx, s_ip_idx; 4760 struct net_device *dev; 4761 struct inet6_dev *idev; 4762 struct hlist_head *head; 4763 4764 s_h = cb->args[0]; 4765 s_idx = idx = cb->args[1]; 4766 s_ip_idx = ip_idx = cb->args[2]; 4767 4768 rcu_read_lock(); 4769 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ net->dev_base_seq; 4770 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 4771 idx = 0; 4772 head = &net->dev_index_head[h]; 4773 hlist_for_each_entry_rcu(dev, head, index_hlist) { 4774 if (idx < s_idx) 4775 goto cont; 4776 if (h > s_h || idx > s_idx) 4777 s_ip_idx = 0; 4778 ip_idx = 0; 4779 idev = __in6_dev_get(dev); 4780 if (!idev) 4781 goto cont; 4782 4783 if (in6_dump_addrs(idev, skb, cb, type, 4784 s_ip_idx, &ip_idx) < 0) 4785 goto done; 4786 cont: 4787 idx++; 4788 } 4789 } 4790 done: 4791 rcu_read_unlock(); 4792 cb->args[0] = h; 4793 cb->args[1] = idx; 4794 cb->args[2] = ip_idx; 4795 4796 return skb->len; 4797 } 4798 4799 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb) 4800 { 4801 enum addr_type_t type = UNICAST_ADDR; 4802 4803 return inet6_dump_addr(skb, cb, type); 4804 } 4805 4806 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb) 4807 { 4808 enum addr_type_t type = MULTICAST_ADDR; 4809 4810 return inet6_dump_addr(skb, cb, type); 4811 } 4812 4813 4814 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb) 4815 { 4816 enum addr_type_t type = ANYCAST_ADDR; 4817 4818 return inet6_dump_addr(skb, cb, type); 4819 } 4820 4821 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh) 4822 { 4823 struct net *net = sock_net(in_skb->sk); 4824 struct ifaddrmsg *ifm; 4825 struct nlattr *tb[IFA_MAX+1]; 4826 struct in6_addr *addr = NULL, *peer; 4827 struct net_device *dev = NULL; 4828 struct inet6_ifaddr *ifa; 4829 struct sk_buff *skb; 4830 int err; 4831 4832 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy); 4833 if (err < 0) 4834 goto errout; 4835 4836 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer); 4837 if (!addr) { 4838 err = -EINVAL; 4839 goto errout; 4840 } 4841 4842 ifm = nlmsg_data(nlh); 4843 if (ifm->ifa_index) 4844 dev = __dev_get_by_index(net, ifm->ifa_index); 4845 4846 ifa = ipv6_get_ifaddr(net, addr, dev, 1); 4847 if (!ifa) { 4848 err = -EADDRNOTAVAIL; 4849 goto errout; 4850 } 4851 4852 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL); 4853 if (!skb) { 4854 err = -ENOBUFS; 4855 goto errout_ifa; 4856 } 4857 4858 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).portid, 4859 nlh->nlmsg_seq, RTM_NEWADDR, 0); 4860 if (err < 0) { 4861 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 4862 WARN_ON(err == -EMSGSIZE); 4863 kfree_skb(skb); 4864 goto errout_ifa; 4865 } 4866 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid); 4867 errout_ifa: 4868 in6_ifa_put(ifa); 4869 errout: 4870 return err; 4871 } 4872 4873 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa) 4874 { 4875 struct sk_buff *skb; 4876 struct net *net = dev_net(ifa->idev->dev); 4877 int err = -ENOBUFS; 4878 4879 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC); 4880 if (!skb) 4881 goto errout; 4882 4883 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0); 4884 if (err < 0) { 4885 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 4886 WARN_ON(err == -EMSGSIZE); 4887 kfree_skb(skb); 4888 goto errout; 4889 } 4890 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC); 4891 return; 4892 errout: 4893 if (err < 0) 4894 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err); 4895 } 4896 4897 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf, 4898 __s32 *array, int bytes) 4899 { 4900 BUG_ON(bytes < (DEVCONF_MAX * 4)); 4901 4902 memset(array, 0, bytes); 4903 array[DEVCONF_FORWARDING] = cnf->forwarding; 4904 array[DEVCONF_HOPLIMIT] = cnf->hop_limit; 4905 array[DEVCONF_MTU6] = cnf->mtu6; 4906 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra; 4907 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects; 4908 array[DEVCONF_AUTOCONF] = cnf->autoconf; 4909 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits; 4910 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits; 4911 array[DEVCONF_RTR_SOLICIT_INTERVAL] = 4912 jiffies_to_msecs(cnf->rtr_solicit_interval); 4913 array[DEVCONF_RTR_SOLICIT_MAX_INTERVAL] = 4914 jiffies_to_msecs(cnf->rtr_solicit_max_interval); 4915 array[DEVCONF_RTR_SOLICIT_DELAY] = 4916 jiffies_to_msecs(cnf->rtr_solicit_delay); 4917 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version; 4918 array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] = 4919 jiffies_to_msecs(cnf->mldv1_unsolicited_report_interval); 4920 array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] = 4921 jiffies_to_msecs(cnf->mldv2_unsolicited_report_interval); 4922 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr; 4923 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft; 4924 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft; 4925 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry; 4926 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor; 4927 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses; 4928 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr; 4929 array[DEVCONF_ACCEPT_RA_MIN_HOP_LIMIT] = cnf->accept_ra_min_hop_limit; 4930 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo; 4931 #ifdef CONFIG_IPV6_ROUTER_PREF 4932 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref; 4933 array[DEVCONF_RTR_PROBE_INTERVAL] = 4934 jiffies_to_msecs(cnf->rtr_probe_interval); 4935 #ifdef CONFIG_IPV6_ROUTE_INFO 4936 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen; 4937 #endif 4938 #endif 4939 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp; 4940 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route; 4941 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 4942 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad; 4943 array[DEVCONF_USE_OPTIMISTIC] = cnf->use_optimistic; 4944 #endif 4945 #ifdef CONFIG_IPV6_MROUTE 4946 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding; 4947 #endif 4948 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6; 4949 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad; 4950 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao; 4951 array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify; 4952 array[DEVCONF_SUPPRESS_FRAG_NDISC] = cnf->suppress_frag_ndisc; 4953 array[DEVCONF_ACCEPT_RA_FROM_LOCAL] = cnf->accept_ra_from_local; 4954 array[DEVCONF_ACCEPT_RA_MTU] = cnf->accept_ra_mtu; 4955 array[DEVCONF_IGNORE_ROUTES_WITH_LINKDOWN] = cnf->ignore_routes_with_linkdown; 4956 /* we omit DEVCONF_STABLE_SECRET for now */ 4957 array[DEVCONF_USE_OIF_ADDRS_ONLY] = cnf->use_oif_addrs_only; 4958 array[DEVCONF_DROP_UNICAST_IN_L2_MULTICAST] = cnf->drop_unicast_in_l2_multicast; 4959 array[DEVCONF_DROP_UNSOLICITED_NA] = cnf->drop_unsolicited_na; 4960 array[DEVCONF_KEEP_ADDR_ON_DOWN] = cnf->keep_addr_on_down; 4961 array[DEVCONF_SEG6_ENABLED] = cnf->seg6_enabled; 4962 #ifdef CONFIG_IPV6_SEG6_HMAC 4963 array[DEVCONF_SEG6_REQUIRE_HMAC] = cnf->seg6_require_hmac; 4964 #endif 4965 } 4966 4967 static inline size_t inet6_ifla6_size(void) 4968 { 4969 return nla_total_size(4) /* IFLA_INET6_FLAGS */ 4970 + nla_total_size(sizeof(struct ifla_cacheinfo)) 4971 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */ 4972 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */ 4973 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */ 4974 + nla_total_size(sizeof(struct in6_addr)); /* IFLA_INET6_TOKEN */ 4975 } 4976 4977 static inline size_t inet6_if_nlmsg_size(void) 4978 { 4979 return NLMSG_ALIGN(sizeof(struct ifinfomsg)) 4980 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */ 4981 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */ 4982 + nla_total_size(4) /* IFLA_MTU */ 4983 + nla_total_size(4) /* IFLA_LINK */ 4984 + nla_total_size(1) /* IFLA_OPERSTATE */ 4985 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */ 4986 } 4987 4988 static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib, 4989 int bytes) 4990 { 4991 int i; 4992 int pad = bytes - sizeof(u64) * ICMP6_MIB_MAX; 4993 BUG_ON(pad < 0); 4994 4995 /* Use put_unaligned() because stats may not be aligned for u64. */ 4996 put_unaligned(ICMP6_MIB_MAX, &stats[0]); 4997 for (i = 1; i < ICMP6_MIB_MAX; i++) 4998 put_unaligned(atomic_long_read(&mib[i]), &stats[i]); 4999 5000 memset(&stats[ICMP6_MIB_MAX], 0, pad); 5001 } 5002 5003 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu *mib, 5004 int bytes, size_t syncpoff) 5005 { 5006 int i, c; 5007 u64 buff[IPSTATS_MIB_MAX]; 5008 int pad = bytes - sizeof(u64) * IPSTATS_MIB_MAX; 5009 5010 BUG_ON(pad < 0); 5011 5012 memset(buff, 0, sizeof(buff)); 5013 buff[0] = IPSTATS_MIB_MAX; 5014 5015 for_each_possible_cpu(c) { 5016 for (i = 1; i < IPSTATS_MIB_MAX; i++) 5017 buff[i] += snmp_get_cpu_field64(mib, c, i, syncpoff); 5018 } 5019 5020 memcpy(stats, buff, IPSTATS_MIB_MAX * sizeof(u64)); 5021 memset(&stats[IPSTATS_MIB_MAX], 0, pad); 5022 } 5023 5024 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype, 5025 int bytes) 5026 { 5027 switch (attrtype) { 5028 case IFLA_INET6_STATS: 5029 __snmp6_fill_stats64(stats, idev->stats.ipv6, bytes, 5030 offsetof(struct ipstats_mib, syncp)); 5031 break; 5032 case IFLA_INET6_ICMP6STATS: 5033 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, bytes); 5034 break; 5035 } 5036 } 5037 5038 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev, 5039 u32 ext_filter_mask) 5040 { 5041 struct nlattr *nla; 5042 struct ifla_cacheinfo ci; 5043 5044 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags)) 5045 goto nla_put_failure; 5046 ci.max_reasm_len = IPV6_MAXPLEN; 5047 ci.tstamp = cstamp_delta(idev->tstamp); 5048 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time); 5049 ci.retrans_time = jiffies_to_msecs(NEIGH_VAR(idev->nd_parms, RETRANS_TIME)); 5050 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci)) 5051 goto nla_put_failure; 5052 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32)); 5053 if (!nla) 5054 goto nla_put_failure; 5055 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla)); 5056 5057 /* XXX - MC not implemented */ 5058 5059 if (ext_filter_mask & RTEXT_FILTER_SKIP_STATS) 5060 return 0; 5061 5062 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64)); 5063 if (!nla) 5064 goto nla_put_failure; 5065 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla)); 5066 5067 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64)); 5068 if (!nla) 5069 goto nla_put_failure; 5070 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla)); 5071 5072 nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr)); 5073 if (!nla) 5074 goto nla_put_failure; 5075 5076 if (nla_put_u8(skb, IFLA_INET6_ADDR_GEN_MODE, idev->addr_gen_mode)) 5077 goto nla_put_failure; 5078 5079 read_lock_bh(&idev->lock); 5080 memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla)); 5081 read_unlock_bh(&idev->lock); 5082 5083 return 0; 5084 5085 nla_put_failure: 5086 return -EMSGSIZE; 5087 } 5088 5089 static size_t inet6_get_link_af_size(const struct net_device *dev, 5090 u32 ext_filter_mask) 5091 { 5092 if (!__in6_dev_get(dev)) 5093 return 0; 5094 5095 return inet6_ifla6_size(); 5096 } 5097 5098 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev, 5099 u32 ext_filter_mask) 5100 { 5101 struct inet6_dev *idev = __in6_dev_get(dev); 5102 5103 if (!idev) 5104 return -ENODATA; 5105 5106 if (inet6_fill_ifla6_attrs(skb, idev, ext_filter_mask) < 0) 5107 return -EMSGSIZE; 5108 5109 return 0; 5110 } 5111 5112 static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token) 5113 { 5114 struct inet6_ifaddr *ifp; 5115 struct net_device *dev = idev->dev; 5116 bool clear_token, update_rs = false; 5117 struct in6_addr ll_addr; 5118 5119 ASSERT_RTNL(); 5120 5121 if (!token) 5122 return -EINVAL; 5123 if (dev->flags & (IFF_LOOPBACK | IFF_NOARP)) 5124 return -EINVAL; 5125 if (!ipv6_accept_ra(idev)) 5126 return -EINVAL; 5127 if (idev->cnf.rtr_solicits == 0) 5128 return -EINVAL; 5129 5130 write_lock_bh(&idev->lock); 5131 5132 BUILD_BUG_ON(sizeof(token->s6_addr) != 16); 5133 memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8); 5134 5135 write_unlock_bh(&idev->lock); 5136 5137 clear_token = ipv6_addr_any(token); 5138 if (clear_token) 5139 goto update_lft; 5140 5141 if (!idev->dead && (idev->if_flags & IF_READY) && 5142 !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE | 5143 IFA_F_OPTIMISTIC)) { 5144 /* If we're not ready, then normal ifup will take care 5145 * of this. Otherwise, we need to request our rs here. 5146 */ 5147 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters); 5148 update_rs = true; 5149 } 5150 5151 update_lft: 5152 write_lock_bh(&idev->lock); 5153 5154 if (update_rs) { 5155 idev->if_flags |= IF_RS_SENT; 5156 idev->rs_interval = rfc3315_s14_backoff_init( 5157 idev->cnf.rtr_solicit_interval); 5158 idev->rs_probes = 1; 5159 addrconf_mod_rs_timer(idev, idev->rs_interval); 5160 } 5161 5162 /* Well, that's kinda nasty ... */ 5163 list_for_each_entry(ifp, &idev->addr_list, if_list) { 5164 spin_lock(&ifp->lock); 5165 if (ifp->tokenized) { 5166 ifp->valid_lft = 0; 5167 ifp->prefered_lft = 0; 5168 } 5169 spin_unlock(&ifp->lock); 5170 } 5171 5172 write_unlock_bh(&idev->lock); 5173 inet6_ifinfo_notify(RTM_NEWLINK, idev); 5174 addrconf_verify_rtnl(); 5175 return 0; 5176 } 5177 5178 static const struct nla_policy inet6_af_policy[IFLA_INET6_MAX + 1] = { 5179 [IFLA_INET6_ADDR_GEN_MODE] = { .type = NLA_U8 }, 5180 [IFLA_INET6_TOKEN] = { .len = sizeof(struct in6_addr) }, 5181 }; 5182 5183 static int inet6_validate_link_af(const struct net_device *dev, 5184 const struct nlattr *nla) 5185 { 5186 struct nlattr *tb[IFLA_INET6_MAX + 1]; 5187 5188 if (dev && !__in6_dev_get(dev)) 5189 return -EAFNOSUPPORT; 5190 5191 return nla_parse_nested(tb, IFLA_INET6_MAX, nla, inet6_af_policy); 5192 } 5193 5194 static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla) 5195 { 5196 int err = -EINVAL; 5197 struct inet6_dev *idev = __in6_dev_get(dev); 5198 struct nlattr *tb[IFLA_INET6_MAX + 1]; 5199 5200 if (!idev) 5201 return -EAFNOSUPPORT; 5202 5203 if (nla_parse_nested(tb, IFLA_INET6_MAX, nla, NULL) < 0) 5204 BUG(); 5205 5206 if (tb[IFLA_INET6_TOKEN]) { 5207 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN])); 5208 if (err) 5209 return err; 5210 } 5211 5212 if (tb[IFLA_INET6_ADDR_GEN_MODE]) { 5213 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]); 5214 5215 if (mode != IN6_ADDR_GEN_MODE_EUI64 && 5216 mode != IN6_ADDR_GEN_MODE_NONE && 5217 mode != IN6_ADDR_GEN_MODE_STABLE_PRIVACY && 5218 mode != IN6_ADDR_GEN_MODE_RANDOM) 5219 return -EINVAL; 5220 5221 if (mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY && 5222 !idev->cnf.stable_secret.initialized && 5223 !dev_net(dev)->ipv6.devconf_dflt->stable_secret.initialized) 5224 return -EINVAL; 5225 5226 idev->addr_gen_mode = mode; 5227 err = 0; 5228 } 5229 5230 return err; 5231 } 5232 5233 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev, 5234 u32 portid, u32 seq, int event, unsigned int flags) 5235 { 5236 struct net_device *dev = idev->dev; 5237 struct ifinfomsg *hdr; 5238 struct nlmsghdr *nlh; 5239 void *protoinfo; 5240 5241 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags); 5242 if (!nlh) 5243 return -EMSGSIZE; 5244 5245 hdr = nlmsg_data(nlh); 5246 hdr->ifi_family = AF_INET6; 5247 hdr->__ifi_pad = 0; 5248 hdr->ifi_type = dev->type; 5249 hdr->ifi_index = dev->ifindex; 5250 hdr->ifi_flags = dev_get_flags(dev); 5251 hdr->ifi_change = 0; 5252 5253 if (nla_put_string(skb, IFLA_IFNAME, dev->name) || 5254 (dev->addr_len && 5255 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) || 5256 nla_put_u32(skb, IFLA_MTU, dev->mtu) || 5257 (dev->ifindex != dev_get_iflink(dev) && 5258 nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))) || 5259 nla_put_u8(skb, IFLA_OPERSTATE, 5260 netif_running(dev) ? dev->operstate : IF_OPER_DOWN)) 5261 goto nla_put_failure; 5262 protoinfo = nla_nest_start(skb, IFLA_PROTINFO); 5263 if (!protoinfo) 5264 goto nla_put_failure; 5265 5266 if (inet6_fill_ifla6_attrs(skb, idev, 0) < 0) 5267 goto nla_put_failure; 5268 5269 nla_nest_end(skb, protoinfo); 5270 nlmsg_end(skb, nlh); 5271 return 0; 5272 5273 nla_put_failure: 5274 nlmsg_cancel(skb, nlh); 5275 return -EMSGSIZE; 5276 } 5277 5278 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb) 5279 { 5280 struct net *net = sock_net(skb->sk); 5281 int h, s_h; 5282 int idx = 0, s_idx; 5283 struct net_device *dev; 5284 struct inet6_dev *idev; 5285 struct hlist_head *head; 5286 5287 s_h = cb->args[0]; 5288 s_idx = cb->args[1]; 5289 5290 rcu_read_lock(); 5291 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 5292 idx = 0; 5293 head = &net->dev_index_head[h]; 5294 hlist_for_each_entry_rcu(dev, head, index_hlist) { 5295 if (idx < s_idx) 5296 goto cont; 5297 idev = __in6_dev_get(dev); 5298 if (!idev) 5299 goto cont; 5300 if (inet6_fill_ifinfo(skb, idev, 5301 NETLINK_CB(cb->skb).portid, 5302 cb->nlh->nlmsg_seq, 5303 RTM_NEWLINK, NLM_F_MULTI) < 0) 5304 goto out; 5305 cont: 5306 idx++; 5307 } 5308 } 5309 out: 5310 rcu_read_unlock(); 5311 cb->args[1] = idx; 5312 cb->args[0] = h; 5313 5314 return skb->len; 5315 } 5316 5317 void inet6_ifinfo_notify(int event, struct inet6_dev *idev) 5318 { 5319 struct sk_buff *skb; 5320 struct net *net = dev_net(idev->dev); 5321 int err = -ENOBUFS; 5322 5323 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC); 5324 if (!skb) 5325 goto errout; 5326 5327 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0); 5328 if (err < 0) { 5329 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */ 5330 WARN_ON(err == -EMSGSIZE); 5331 kfree_skb(skb); 5332 goto errout; 5333 } 5334 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC); 5335 return; 5336 errout: 5337 if (err < 0) 5338 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err); 5339 } 5340 5341 static inline size_t inet6_prefix_nlmsg_size(void) 5342 { 5343 return NLMSG_ALIGN(sizeof(struct prefixmsg)) 5344 + nla_total_size(sizeof(struct in6_addr)) 5345 + nla_total_size(sizeof(struct prefix_cacheinfo)); 5346 } 5347 5348 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev, 5349 struct prefix_info *pinfo, u32 portid, u32 seq, 5350 int event, unsigned int flags) 5351 { 5352 struct prefixmsg *pmsg; 5353 struct nlmsghdr *nlh; 5354 struct prefix_cacheinfo ci; 5355 5356 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags); 5357 if (!nlh) 5358 return -EMSGSIZE; 5359 5360 pmsg = nlmsg_data(nlh); 5361 pmsg->prefix_family = AF_INET6; 5362 pmsg->prefix_pad1 = 0; 5363 pmsg->prefix_pad2 = 0; 5364 pmsg->prefix_ifindex = idev->dev->ifindex; 5365 pmsg->prefix_len = pinfo->prefix_len; 5366 pmsg->prefix_type = pinfo->type; 5367 pmsg->prefix_pad3 = 0; 5368 pmsg->prefix_flags = 0; 5369 if (pinfo->onlink) 5370 pmsg->prefix_flags |= IF_PREFIX_ONLINK; 5371 if (pinfo->autoconf) 5372 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF; 5373 5374 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix)) 5375 goto nla_put_failure; 5376 ci.preferred_time = ntohl(pinfo->prefered); 5377 ci.valid_time = ntohl(pinfo->valid); 5378 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci)) 5379 goto nla_put_failure; 5380 nlmsg_end(skb, nlh); 5381 return 0; 5382 5383 nla_put_failure: 5384 nlmsg_cancel(skb, nlh); 5385 return -EMSGSIZE; 5386 } 5387 5388 static void inet6_prefix_notify(int event, struct inet6_dev *idev, 5389 struct prefix_info *pinfo) 5390 { 5391 struct sk_buff *skb; 5392 struct net *net = dev_net(idev->dev); 5393 int err = -ENOBUFS; 5394 5395 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC); 5396 if (!skb) 5397 goto errout; 5398 5399 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0); 5400 if (err < 0) { 5401 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */ 5402 WARN_ON(err == -EMSGSIZE); 5403 kfree_skb(skb); 5404 goto errout; 5405 } 5406 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC); 5407 return; 5408 errout: 5409 if (err < 0) 5410 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err); 5411 } 5412 5413 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 5414 { 5415 struct net *net = dev_net(ifp->idev->dev); 5416 5417 if (event) 5418 ASSERT_RTNL(); 5419 5420 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp); 5421 5422 switch (event) { 5423 case RTM_NEWADDR: 5424 /* 5425 * If the address was optimistic 5426 * we inserted the route at the start of 5427 * our DAD process, so we don't need 5428 * to do it again 5429 */ 5430 if (!(ifp->rt->rt6i_node)) 5431 ip6_ins_rt(ifp->rt); 5432 if (ifp->idev->cnf.forwarding) 5433 addrconf_join_anycast(ifp); 5434 if (!ipv6_addr_any(&ifp->peer_addr)) 5435 addrconf_prefix_route(&ifp->peer_addr, 128, 5436 ifp->idev->dev, 0, 0); 5437 break; 5438 case RTM_DELADDR: 5439 if (ifp->idev->cnf.forwarding) 5440 addrconf_leave_anycast(ifp); 5441 addrconf_leave_solict(ifp->idev, &ifp->addr); 5442 if (!ipv6_addr_any(&ifp->peer_addr)) { 5443 struct rt6_info *rt; 5444 5445 rt = addrconf_get_prefix_route(&ifp->peer_addr, 128, 5446 ifp->idev->dev, 0, 0); 5447 if (rt) 5448 ip6_del_rt(rt); 5449 } 5450 if (ifp->rt) { 5451 dst_hold(&ifp->rt->dst); 5452 ip6_del_rt(ifp->rt); 5453 } 5454 rt_genid_bump_ipv6(net); 5455 break; 5456 } 5457 atomic_inc(&net->ipv6.dev_addr_genid); 5458 } 5459 5460 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 5461 { 5462 rcu_read_lock_bh(); 5463 if (likely(ifp->idev->dead == 0)) 5464 __ipv6_ifa_notify(event, ifp); 5465 rcu_read_unlock_bh(); 5466 } 5467 5468 #ifdef CONFIG_SYSCTL 5469 5470 static 5471 int addrconf_sysctl_forward(struct ctl_table *ctl, int write, 5472 void __user *buffer, size_t *lenp, loff_t *ppos) 5473 { 5474 int *valp = ctl->data; 5475 int val = *valp; 5476 loff_t pos = *ppos; 5477 struct ctl_table lctl; 5478 int ret; 5479 5480 /* 5481 * ctl->data points to idev->cnf.forwarding, we should 5482 * not modify it until we get the rtnl lock. 5483 */ 5484 lctl = *ctl; 5485 lctl.data = &val; 5486 5487 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 5488 5489 if (write) 5490 ret = addrconf_fixup_forwarding(ctl, valp, val); 5491 if (ret) 5492 *ppos = pos; 5493 return ret; 5494 } 5495 5496 static 5497 int addrconf_sysctl_mtu(struct ctl_table *ctl, int write, 5498 void __user *buffer, size_t *lenp, loff_t *ppos) 5499 { 5500 struct inet6_dev *idev = ctl->extra1; 5501 int min_mtu = IPV6_MIN_MTU; 5502 struct ctl_table lctl; 5503 5504 lctl = *ctl; 5505 lctl.extra1 = &min_mtu; 5506 lctl.extra2 = idev ? &idev->dev->mtu : NULL; 5507 5508 return proc_dointvec_minmax(&lctl, write, buffer, lenp, ppos); 5509 } 5510 5511 static void dev_disable_change(struct inet6_dev *idev) 5512 { 5513 struct netdev_notifier_info info; 5514 5515 if (!idev || !idev->dev) 5516 return; 5517 5518 netdev_notifier_info_init(&info, idev->dev); 5519 if (idev->cnf.disable_ipv6) 5520 addrconf_notify(NULL, NETDEV_DOWN, &info); 5521 else 5522 addrconf_notify(NULL, NETDEV_UP, &info); 5523 } 5524 5525 static void addrconf_disable_change(struct net *net, __s32 newf) 5526 { 5527 struct net_device *dev; 5528 struct inet6_dev *idev; 5529 5530 rcu_read_lock(); 5531 for_each_netdev_rcu(net, dev) { 5532 idev = __in6_dev_get(dev); 5533 if (idev) { 5534 int changed = (!idev->cnf.disable_ipv6) ^ (!newf); 5535 idev->cnf.disable_ipv6 = newf; 5536 if (changed) 5537 dev_disable_change(idev); 5538 } 5539 } 5540 rcu_read_unlock(); 5541 } 5542 5543 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf) 5544 { 5545 struct net *net; 5546 int old; 5547 5548 if (!rtnl_trylock()) 5549 return restart_syscall(); 5550 5551 net = (struct net *)table->extra2; 5552 old = *p; 5553 *p = newf; 5554 5555 if (p == &net->ipv6.devconf_dflt->disable_ipv6) { 5556 rtnl_unlock(); 5557 return 0; 5558 } 5559 5560 if (p == &net->ipv6.devconf_all->disable_ipv6) { 5561 net->ipv6.devconf_dflt->disable_ipv6 = newf; 5562 addrconf_disable_change(net, newf); 5563 } else if ((!newf) ^ (!old)) 5564 dev_disable_change((struct inet6_dev *)table->extra1); 5565 5566 rtnl_unlock(); 5567 return 0; 5568 } 5569 5570 static 5571 int addrconf_sysctl_disable(struct ctl_table *ctl, int write, 5572 void __user *buffer, size_t *lenp, loff_t *ppos) 5573 { 5574 int *valp = ctl->data; 5575 int val = *valp; 5576 loff_t pos = *ppos; 5577 struct ctl_table lctl; 5578 int ret; 5579 5580 /* 5581 * ctl->data points to idev->cnf.disable_ipv6, we should 5582 * not modify it until we get the rtnl lock. 5583 */ 5584 lctl = *ctl; 5585 lctl.data = &val; 5586 5587 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 5588 5589 if (write) 5590 ret = addrconf_disable_ipv6(ctl, valp, val); 5591 if (ret) 5592 *ppos = pos; 5593 return ret; 5594 } 5595 5596 static 5597 int addrconf_sysctl_proxy_ndp(struct ctl_table *ctl, int write, 5598 void __user *buffer, size_t *lenp, loff_t *ppos) 5599 { 5600 int *valp = ctl->data; 5601 int ret; 5602 int old, new; 5603 5604 old = *valp; 5605 ret = proc_dointvec(ctl, write, buffer, lenp, ppos); 5606 new = *valp; 5607 5608 if (write && old != new) { 5609 struct net *net = ctl->extra2; 5610 5611 if (!rtnl_trylock()) 5612 return restart_syscall(); 5613 5614 if (valp == &net->ipv6.devconf_dflt->proxy_ndp) 5615 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH, 5616 NETCONFA_IFINDEX_DEFAULT, 5617 net->ipv6.devconf_dflt); 5618 else if (valp == &net->ipv6.devconf_all->proxy_ndp) 5619 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH, 5620 NETCONFA_IFINDEX_ALL, 5621 net->ipv6.devconf_all); 5622 else { 5623 struct inet6_dev *idev = ctl->extra1; 5624 5625 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH, 5626 idev->dev->ifindex, 5627 &idev->cnf); 5628 } 5629 rtnl_unlock(); 5630 } 5631 5632 return ret; 5633 } 5634 5635 static int addrconf_sysctl_stable_secret(struct ctl_table *ctl, int write, 5636 void __user *buffer, size_t *lenp, 5637 loff_t *ppos) 5638 { 5639 int err; 5640 struct in6_addr addr; 5641 char str[IPV6_MAX_STRLEN]; 5642 struct ctl_table lctl = *ctl; 5643 struct net *net = ctl->extra2; 5644 struct ipv6_stable_secret *secret = ctl->data; 5645 5646 if (&net->ipv6.devconf_all->stable_secret == ctl->data) 5647 return -EIO; 5648 5649 lctl.maxlen = IPV6_MAX_STRLEN; 5650 lctl.data = str; 5651 5652 if (!rtnl_trylock()) 5653 return restart_syscall(); 5654 5655 if (!write && !secret->initialized) { 5656 err = -EIO; 5657 goto out; 5658 } 5659 5660 err = snprintf(str, sizeof(str), "%pI6", &secret->secret); 5661 if (err >= sizeof(str)) { 5662 err = -EIO; 5663 goto out; 5664 } 5665 5666 err = proc_dostring(&lctl, write, buffer, lenp, ppos); 5667 if (err || !write) 5668 goto out; 5669 5670 if (in6_pton(str, -1, addr.in6_u.u6_addr8, -1, NULL) != 1) { 5671 err = -EIO; 5672 goto out; 5673 } 5674 5675 secret->initialized = true; 5676 secret->secret = addr; 5677 5678 if (&net->ipv6.devconf_dflt->stable_secret == ctl->data) { 5679 struct net_device *dev; 5680 5681 for_each_netdev(net, dev) { 5682 struct inet6_dev *idev = __in6_dev_get(dev); 5683 5684 if (idev) { 5685 idev->addr_gen_mode = 5686 IN6_ADDR_GEN_MODE_STABLE_PRIVACY; 5687 } 5688 } 5689 } else { 5690 struct inet6_dev *idev = ctl->extra1; 5691 5692 idev->addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY; 5693 } 5694 5695 out: 5696 rtnl_unlock(); 5697 5698 return err; 5699 } 5700 5701 static 5702 int addrconf_sysctl_ignore_routes_with_linkdown(struct ctl_table *ctl, 5703 int write, 5704 void __user *buffer, 5705 size_t *lenp, 5706 loff_t *ppos) 5707 { 5708 int *valp = ctl->data; 5709 int val = *valp; 5710 loff_t pos = *ppos; 5711 struct ctl_table lctl; 5712 int ret; 5713 5714 /* ctl->data points to idev->cnf.ignore_routes_when_linkdown 5715 * we should not modify it until we get the rtnl lock. 5716 */ 5717 lctl = *ctl; 5718 lctl.data = &val; 5719 5720 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 5721 5722 if (write) 5723 ret = addrconf_fixup_linkdown(ctl, valp, val); 5724 if (ret) 5725 *ppos = pos; 5726 return ret; 5727 } 5728 5729 static int minus_one = -1; 5730 static const int one = 1; 5731 static const int two_five_five = 255; 5732 5733 static const struct ctl_table addrconf_sysctl[] = { 5734 { 5735 .procname = "forwarding", 5736 .data = &ipv6_devconf.forwarding, 5737 .maxlen = sizeof(int), 5738 .mode = 0644, 5739 .proc_handler = addrconf_sysctl_forward, 5740 }, 5741 { 5742 .procname = "hop_limit", 5743 .data = &ipv6_devconf.hop_limit, 5744 .maxlen = sizeof(int), 5745 .mode = 0644, 5746 .proc_handler = proc_dointvec_minmax, 5747 .extra1 = (void *)&one, 5748 .extra2 = (void *)&two_five_five, 5749 }, 5750 { 5751 .procname = "mtu", 5752 .data = &ipv6_devconf.mtu6, 5753 .maxlen = sizeof(int), 5754 .mode = 0644, 5755 .proc_handler = addrconf_sysctl_mtu, 5756 }, 5757 { 5758 .procname = "accept_ra", 5759 .data = &ipv6_devconf.accept_ra, 5760 .maxlen = sizeof(int), 5761 .mode = 0644, 5762 .proc_handler = proc_dointvec, 5763 }, 5764 { 5765 .procname = "accept_redirects", 5766 .data = &ipv6_devconf.accept_redirects, 5767 .maxlen = sizeof(int), 5768 .mode = 0644, 5769 .proc_handler = proc_dointvec, 5770 }, 5771 { 5772 .procname = "autoconf", 5773 .data = &ipv6_devconf.autoconf, 5774 .maxlen = sizeof(int), 5775 .mode = 0644, 5776 .proc_handler = proc_dointvec, 5777 }, 5778 { 5779 .procname = "dad_transmits", 5780 .data = &ipv6_devconf.dad_transmits, 5781 .maxlen = sizeof(int), 5782 .mode = 0644, 5783 .proc_handler = proc_dointvec, 5784 }, 5785 { 5786 .procname = "router_solicitations", 5787 .data = &ipv6_devconf.rtr_solicits, 5788 .maxlen = sizeof(int), 5789 .mode = 0644, 5790 .proc_handler = proc_dointvec_minmax, 5791 .extra1 = &minus_one, 5792 }, 5793 { 5794 .procname = "router_solicitation_interval", 5795 .data = &ipv6_devconf.rtr_solicit_interval, 5796 .maxlen = sizeof(int), 5797 .mode = 0644, 5798 .proc_handler = proc_dointvec_jiffies, 5799 }, 5800 { 5801 .procname = "router_solicitation_max_interval", 5802 .data = &ipv6_devconf.rtr_solicit_max_interval, 5803 .maxlen = sizeof(int), 5804 .mode = 0644, 5805 .proc_handler = proc_dointvec_jiffies, 5806 }, 5807 { 5808 .procname = "router_solicitation_delay", 5809 .data = &ipv6_devconf.rtr_solicit_delay, 5810 .maxlen = sizeof(int), 5811 .mode = 0644, 5812 .proc_handler = proc_dointvec_jiffies, 5813 }, 5814 { 5815 .procname = "force_mld_version", 5816 .data = &ipv6_devconf.force_mld_version, 5817 .maxlen = sizeof(int), 5818 .mode = 0644, 5819 .proc_handler = proc_dointvec, 5820 }, 5821 { 5822 .procname = "mldv1_unsolicited_report_interval", 5823 .data = 5824 &ipv6_devconf.mldv1_unsolicited_report_interval, 5825 .maxlen = sizeof(int), 5826 .mode = 0644, 5827 .proc_handler = proc_dointvec_ms_jiffies, 5828 }, 5829 { 5830 .procname = "mldv2_unsolicited_report_interval", 5831 .data = 5832 &ipv6_devconf.mldv2_unsolicited_report_interval, 5833 .maxlen = sizeof(int), 5834 .mode = 0644, 5835 .proc_handler = proc_dointvec_ms_jiffies, 5836 }, 5837 { 5838 .procname = "use_tempaddr", 5839 .data = &ipv6_devconf.use_tempaddr, 5840 .maxlen = sizeof(int), 5841 .mode = 0644, 5842 .proc_handler = proc_dointvec, 5843 }, 5844 { 5845 .procname = "temp_valid_lft", 5846 .data = &ipv6_devconf.temp_valid_lft, 5847 .maxlen = sizeof(int), 5848 .mode = 0644, 5849 .proc_handler = proc_dointvec, 5850 }, 5851 { 5852 .procname = "temp_prefered_lft", 5853 .data = &ipv6_devconf.temp_prefered_lft, 5854 .maxlen = sizeof(int), 5855 .mode = 0644, 5856 .proc_handler = proc_dointvec, 5857 }, 5858 { 5859 .procname = "regen_max_retry", 5860 .data = &ipv6_devconf.regen_max_retry, 5861 .maxlen = sizeof(int), 5862 .mode = 0644, 5863 .proc_handler = proc_dointvec, 5864 }, 5865 { 5866 .procname = "max_desync_factor", 5867 .data = &ipv6_devconf.max_desync_factor, 5868 .maxlen = sizeof(int), 5869 .mode = 0644, 5870 .proc_handler = proc_dointvec, 5871 }, 5872 { 5873 .procname = "max_addresses", 5874 .data = &ipv6_devconf.max_addresses, 5875 .maxlen = sizeof(int), 5876 .mode = 0644, 5877 .proc_handler = proc_dointvec, 5878 }, 5879 { 5880 .procname = "accept_ra_defrtr", 5881 .data = &ipv6_devconf.accept_ra_defrtr, 5882 .maxlen = sizeof(int), 5883 .mode = 0644, 5884 .proc_handler = proc_dointvec, 5885 }, 5886 { 5887 .procname = "accept_ra_min_hop_limit", 5888 .data = &ipv6_devconf.accept_ra_min_hop_limit, 5889 .maxlen = sizeof(int), 5890 .mode = 0644, 5891 .proc_handler = proc_dointvec, 5892 }, 5893 { 5894 .procname = "accept_ra_pinfo", 5895 .data = &ipv6_devconf.accept_ra_pinfo, 5896 .maxlen = sizeof(int), 5897 .mode = 0644, 5898 .proc_handler = proc_dointvec, 5899 }, 5900 #ifdef CONFIG_IPV6_ROUTER_PREF 5901 { 5902 .procname = "accept_ra_rtr_pref", 5903 .data = &ipv6_devconf.accept_ra_rtr_pref, 5904 .maxlen = sizeof(int), 5905 .mode = 0644, 5906 .proc_handler = proc_dointvec, 5907 }, 5908 { 5909 .procname = "router_probe_interval", 5910 .data = &ipv6_devconf.rtr_probe_interval, 5911 .maxlen = sizeof(int), 5912 .mode = 0644, 5913 .proc_handler = proc_dointvec_jiffies, 5914 }, 5915 #ifdef CONFIG_IPV6_ROUTE_INFO 5916 { 5917 .procname = "accept_ra_rt_info_max_plen", 5918 .data = &ipv6_devconf.accept_ra_rt_info_max_plen, 5919 .maxlen = sizeof(int), 5920 .mode = 0644, 5921 .proc_handler = proc_dointvec, 5922 }, 5923 #endif 5924 #endif 5925 { 5926 .procname = "proxy_ndp", 5927 .data = &ipv6_devconf.proxy_ndp, 5928 .maxlen = sizeof(int), 5929 .mode = 0644, 5930 .proc_handler = addrconf_sysctl_proxy_ndp, 5931 }, 5932 { 5933 .procname = "accept_source_route", 5934 .data = &ipv6_devconf.accept_source_route, 5935 .maxlen = sizeof(int), 5936 .mode = 0644, 5937 .proc_handler = proc_dointvec, 5938 }, 5939 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 5940 { 5941 .procname = "optimistic_dad", 5942 .data = &ipv6_devconf.optimistic_dad, 5943 .maxlen = sizeof(int), 5944 .mode = 0644, 5945 .proc_handler = proc_dointvec, 5946 }, 5947 { 5948 .procname = "use_optimistic", 5949 .data = &ipv6_devconf.use_optimistic, 5950 .maxlen = sizeof(int), 5951 .mode = 0644, 5952 .proc_handler = proc_dointvec, 5953 }, 5954 #endif 5955 #ifdef CONFIG_IPV6_MROUTE 5956 { 5957 .procname = "mc_forwarding", 5958 .data = &ipv6_devconf.mc_forwarding, 5959 .maxlen = sizeof(int), 5960 .mode = 0444, 5961 .proc_handler = proc_dointvec, 5962 }, 5963 #endif 5964 { 5965 .procname = "disable_ipv6", 5966 .data = &ipv6_devconf.disable_ipv6, 5967 .maxlen = sizeof(int), 5968 .mode = 0644, 5969 .proc_handler = addrconf_sysctl_disable, 5970 }, 5971 { 5972 .procname = "accept_dad", 5973 .data = &ipv6_devconf.accept_dad, 5974 .maxlen = sizeof(int), 5975 .mode = 0644, 5976 .proc_handler = proc_dointvec, 5977 }, 5978 { 5979 .procname = "force_tllao", 5980 .data = &ipv6_devconf.force_tllao, 5981 .maxlen = sizeof(int), 5982 .mode = 0644, 5983 .proc_handler = proc_dointvec 5984 }, 5985 { 5986 .procname = "ndisc_notify", 5987 .data = &ipv6_devconf.ndisc_notify, 5988 .maxlen = sizeof(int), 5989 .mode = 0644, 5990 .proc_handler = proc_dointvec 5991 }, 5992 { 5993 .procname = "suppress_frag_ndisc", 5994 .data = &ipv6_devconf.suppress_frag_ndisc, 5995 .maxlen = sizeof(int), 5996 .mode = 0644, 5997 .proc_handler = proc_dointvec 5998 }, 5999 { 6000 .procname = "accept_ra_from_local", 6001 .data = &ipv6_devconf.accept_ra_from_local, 6002 .maxlen = sizeof(int), 6003 .mode = 0644, 6004 .proc_handler = proc_dointvec, 6005 }, 6006 { 6007 .procname = "accept_ra_mtu", 6008 .data = &ipv6_devconf.accept_ra_mtu, 6009 .maxlen = sizeof(int), 6010 .mode = 0644, 6011 .proc_handler = proc_dointvec, 6012 }, 6013 { 6014 .procname = "stable_secret", 6015 .data = &ipv6_devconf.stable_secret, 6016 .maxlen = IPV6_MAX_STRLEN, 6017 .mode = 0600, 6018 .proc_handler = addrconf_sysctl_stable_secret, 6019 }, 6020 { 6021 .procname = "use_oif_addrs_only", 6022 .data = &ipv6_devconf.use_oif_addrs_only, 6023 .maxlen = sizeof(int), 6024 .mode = 0644, 6025 .proc_handler = proc_dointvec, 6026 }, 6027 { 6028 .procname = "ignore_routes_with_linkdown", 6029 .data = &ipv6_devconf.ignore_routes_with_linkdown, 6030 .maxlen = sizeof(int), 6031 .mode = 0644, 6032 .proc_handler = addrconf_sysctl_ignore_routes_with_linkdown, 6033 }, 6034 { 6035 .procname = "drop_unicast_in_l2_multicast", 6036 .data = &ipv6_devconf.drop_unicast_in_l2_multicast, 6037 .maxlen = sizeof(int), 6038 .mode = 0644, 6039 .proc_handler = proc_dointvec, 6040 }, 6041 { 6042 .procname = "drop_unsolicited_na", 6043 .data = &ipv6_devconf.drop_unsolicited_na, 6044 .maxlen = sizeof(int), 6045 .mode = 0644, 6046 .proc_handler = proc_dointvec, 6047 }, 6048 { 6049 .procname = "keep_addr_on_down", 6050 .data = &ipv6_devconf.keep_addr_on_down, 6051 .maxlen = sizeof(int), 6052 .mode = 0644, 6053 .proc_handler = proc_dointvec, 6054 6055 }, 6056 { 6057 .procname = "seg6_enabled", 6058 .data = &ipv6_devconf.seg6_enabled, 6059 .maxlen = sizeof(int), 6060 .mode = 0644, 6061 .proc_handler = proc_dointvec, 6062 }, 6063 #ifdef CONFIG_IPV6_SEG6_HMAC 6064 { 6065 .procname = "seg6_require_hmac", 6066 .data = &ipv6_devconf.seg6_require_hmac, 6067 .maxlen = sizeof(int), 6068 .mode = 0644, 6069 .proc_handler = proc_dointvec, 6070 }, 6071 #endif 6072 { 6073 /* sentinel */ 6074 } 6075 }; 6076 6077 static int __addrconf_sysctl_register(struct net *net, char *dev_name, 6078 struct inet6_dev *idev, struct ipv6_devconf *p) 6079 { 6080 int i, ifindex; 6081 struct ctl_table *table; 6082 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ]; 6083 6084 table = kmemdup(addrconf_sysctl, sizeof(addrconf_sysctl), GFP_KERNEL); 6085 if (!table) 6086 goto out; 6087 6088 for (i = 0; table[i].data; i++) { 6089 table[i].data += (char *)p - (char *)&ipv6_devconf; 6090 /* If one of these is already set, then it is not safe to 6091 * overwrite either of them: this makes proc_dointvec_minmax 6092 * usable. 6093 */ 6094 if (!table[i].extra1 && !table[i].extra2) { 6095 table[i].extra1 = idev; /* embedded; no ref */ 6096 table[i].extra2 = net; 6097 } 6098 } 6099 6100 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name); 6101 6102 p->sysctl_header = register_net_sysctl(net, path, table); 6103 if (!p->sysctl_header) 6104 goto free; 6105 6106 if (!strcmp(dev_name, "all")) 6107 ifindex = NETCONFA_IFINDEX_ALL; 6108 else if (!strcmp(dev_name, "default")) 6109 ifindex = NETCONFA_IFINDEX_DEFAULT; 6110 else 6111 ifindex = idev->dev->ifindex; 6112 inet6_netconf_notify_devconf(net, NETCONFA_ALL, ifindex, p); 6113 return 0; 6114 6115 free: 6116 kfree(table); 6117 out: 6118 return -ENOBUFS; 6119 } 6120 6121 static void __addrconf_sysctl_unregister(struct ipv6_devconf *p) 6122 { 6123 struct ctl_table *table; 6124 6125 if (!p->sysctl_header) 6126 return; 6127 6128 table = p->sysctl_header->ctl_table_arg; 6129 unregister_net_sysctl_table(p->sysctl_header); 6130 p->sysctl_header = NULL; 6131 kfree(table); 6132 } 6133 6134 static int addrconf_sysctl_register(struct inet6_dev *idev) 6135 { 6136 int err; 6137 6138 if (!sysctl_dev_name_is_allowed(idev->dev->name)) 6139 return -EINVAL; 6140 6141 err = neigh_sysctl_register(idev->dev, idev->nd_parms, 6142 &ndisc_ifinfo_sysctl_change); 6143 if (err) 6144 return err; 6145 err = __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name, 6146 idev, &idev->cnf); 6147 if (err) 6148 neigh_sysctl_unregister(idev->nd_parms); 6149 6150 return err; 6151 } 6152 6153 static void addrconf_sysctl_unregister(struct inet6_dev *idev) 6154 { 6155 __addrconf_sysctl_unregister(&idev->cnf); 6156 neigh_sysctl_unregister(idev->nd_parms); 6157 } 6158 6159 6160 #endif 6161 6162 static int __net_init addrconf_init_net(struct net *net) 6163 { 6164 int err = -ENOMEM; 6165 struct ipv6_devconf *all, *dflt; 6166 6167 all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL); 6168 if (!all) 6169 goto err_alloc_all; 6170 6171 dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL); 6172 if (!dflt) 6173 goto err_alloc_dflt; 6174 6175 /* these will be inherited by all namespaces */ 6176 dflt->autoconf = ipv6_defaults.autoconf; 6177 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6; 6178 6179 dflt->stable_secret.initialized = false; 6180 all->stable_secret.initialized = false; 6181 6182 net->ipv6.devconf_all = all; 6183 net->ipv6.devconf_dflt = dflt; 6184 6185 #ifdef CONFIG_SYSCTL 6186 err = __addrconf_sysctl_register(net, "all", NULL, all); 6187 if (err < 0) 6188 goto err_reg_all; 6189 6190 err = __addrconf_sysctl_register(net, "default", NULL, dflt); 6191 if (err < 0) 6192 goto err_reg_dflt; 6193 #endif 6194 return 0; 6195 6196 #ifdef CONFIG_SYSCTL 6197 err_reg_dflt: 6198 __addrconf_sysctl_unregister(all); 6199 err_reg_all: 6200 kfree(dflt); 6201 #endif 6202 err_alloc_dflt: 6203 kfree(all); 6204 err_alloc_all: 6205 return err; 6206 } 6207 6208 static void __net_exit addrconf_exit_net(struct net *net) 6209 { 6210 #ifdef CONFIG_SYSCTL 6211 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt); 6212 __addrconf_sysctl_unregister(net->ipv6.devconf_all); 6213 #endif 6214 kfree(net->ipv6.devconf_dflt); 6215 kfree(net->ipv6.devconf_all); 6216 } 6217 6218 static struct pernet_operations addrconf_ops = { 6219 .init = addrconf_init_net, 6220 .exit = addrconf_exit_net, 6221 }; 6222 6223 static struct rtnl_af_ops inet6_ops __read_mostly = { 6224 .family = AF_INET6, 6225 .fill_link_af = inet6_fill_link_af, 6226 .get_link_af_size = inet6_get_link_af_size, 6227 .validate_link_af = inet6_validate_link_af, 6228 .set_link_af = inet6_set_link_af, 6229 }; 6230 6231 /* 6232 * Init / cleanup code 6233 */ 6234 6235 int __init addrconf_init(void) 6236 { 6237 struct inet6_dev *idev; 6238 int i, err; 6239 6240 err = ipv6_addr_label_init(); 6241 if (err < 0) { 6242 pr_crit("%s: cannot initialize default policy table: %d\n", 6243 __func__, err); 6244 goto out; 6245 } 6246 6247 err = register_pernet_subsys(&addrconf_ops); 6248 if (err < 0) 6249 goto out_addrlabel; 6250 6251 addrconf_wq = create_workqueue("ipv6_addrconf"); 6252 if (!addrconf_wq) { 6253 err = -ENOMEM; 6254 goto out_nowq; 6255 } 6256 6257 /* The addrconf netdev notifier requires that loopback_dev 6258 * has it's ipv6 private information allocated and setup 6259 * before it can bring up and give link-local addresses 6260 * to other devices which are up. 6261 * 6262 * Unfortunately, loopback_dev is not necessarily the first 6263 * entry in the global dev_base list of net devices. In fact, 6264 * it is likely to be the very last entry on that list. 6265 * So this causes the notifier registry below to try and 6266 * give link-local addresses to all devices besides loopback_dev 6267 * first, then loopback_dev, which cases all the non-loopback_dev 6268 * devices to fail to get a link-local address. 6269 * 6270 * So, as a temporary fix, allocate the ipv6 structure for 6271 * loopback_dev first by hand. 6272 * Longer term, all of the dependencies ipv6 has upon the loopback 6273 * device and it being up should be removed. 6274 */ 6275 rtnl_lock(); 6276 idev = ipv6_add_dev(init_net.loopback_dev); 6277 rtnl_unlock(); 6278 if (IS_ERR(idev)) { 6279 err = PTR_ERR(idev); 6280 goto errlo; 6281 } 6282 6283 for (i = 0; i < IN6_ADDR_HSIZE; i++) 6284 INIT_HLIST_HEAD(&inet6_addr_lst[i]); 6285 6286 register_netdevice_notifier(&ipv6_dev_notf); 6287 6288 addrconf_verify(); 6289 6290 rtnl_af_register(&inet6_ops); 6291 6292 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo, 6293 NULL); 6294 if (err < 0) 6295 goto errout; 6296 6297 /* Only the first call to __rtnl_register can fail */ 6298 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL, NULL); 6299 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL, NULL); 6300 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr, 6301 inet6_dump_ifaddr, NULL); 6302 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL, 6303 inet6_dump_ifmcaddr, NULL); 6304 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL, 6305 inet6_dump_ifacaddr, NULL); 6306 __rtnl_register(PF_INET6, RTM_GETNETCONF, inet6_netconf_get_devconf, 6307 inet6_netconf_dump_devconf, NULL); 6308 6309 ipv6_addr_label_rtnl_register(); 6310 6311 return 0; 6312 errout: 6313 rtnl_af_unregister(&inet6_ops); 6314 unregister_netdevice_notifier(&ipv6_dev_notf); 6315 errlo: 6316 destroy_workqueue(addrconf_wq); 6317 out_nowq: 6318 unregister_pernet_subsys(&addrconf_ops); 6319 out_addrlabel: 6320 ipv6_addr_label_cleanup(); 6321 out: 6322 return err; 6323 } 6324 6325 void addrconf_cleanup(void) 6326 { 6327 struct net_device *dev; 6328 int i; 6329 6330 unregister_netdevice_notifier(&ipv6_dev_notf); 6331 unregister_pernet_subsys(&addrconf_ops); 6332 ipv6_addr_label_cleanup(); 6333 6334 rtnl_lock(); 6335 6336 __rtnl_af_unregister(&inet6_ops); 6337 6338 /* clean dev list */ 6339 for_each_netdev(&init_net, dev) { 6340 if (__in6_dev_get(dev) == NULL) 6341 continue; 6342 addrconf_ifdown(dev, 1); 6343 } 6344 addrconf_ifdown(init_net.loopback_dev, 2); 6345 6346 /* 6347 * Check hash table. 6348 */ 6349 spin_lock_bh(&addrconf_hash_lock); 6350 for (i = 0; i < IN6_ADDR_HSIZE; i++) 6351 WARN_ON(!hlist_empty(&inet6_addr_lst[i])); 6352 spin_unlock_bh(&addrconf_hash_lock); 6353 cancel_delayed_work(&addr_chk_work); 6354 rtnl_unlock(); 6355 6356 destroy_workqueue(addrconf_wq); 6357 } 6358