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/in6.h> 50 #include <linux/netdevice.h> 51 #include <linux/if_addr.h> 52 #include <linux/if_arp.h> 53 #include <linux/if_arcnet.h> 54 #include <linux/if_infiniband.h> 55 #include <linux/route.h> 56 #include <linux/inetdevice.h> 57 #include <linux/init.h> 58 #include <linux/slab.h> 59 #ifdef CONFIG_SYSCTL 60 #include <linux/sysctl.h> 61 #endif 62 #include <linux/capability.h> 63 #include <linux/delay.h> 64 #include <linux/notifier.h> 65 #include <linux/string.h> 66 #include <linux/hash.h> 67 68 #include <net/net_namespace.h> 69 #include <net/sock.h> 70 #include <net/snmp.h> 71 72 #include <net/af_ieee802154.h> 73 #include <net/firewire.h> 74 #include <net/ipv6.h> 75 #include <net/protocol.h> 76 #include <net/ndisc.h> 77 #include <net/ip6_route.h> 78 #include <net/addrconf.h> 79 #include <net/tcp.h> 80 #include <net/ip.h> 81 #include <net/netlink.h> 82 #include <net/pkt_sched.h> 83 #include <linux/if_tunnel.h> 84 #include <linux/rtnetlink.h> 85 #include <linux/netconf.h> 86 #include <linux/random.h> 87 #include <linux/uaccess.h> 88 #include <asm/unaligned.h> 89 90 #include <linux/proc_fs.h> 91 #include <linux/seq_file.h> 92 #include <linux/export.h> 93 94 /* Set to 3 to get tracing... */ 95 #define ACONF_DEBUG 2 96 97 #if ACONF_DEBUG >= 3 98 #define ADBG(fmt, ...) printk(fmt, ##__VA_ARGS__) 99 #else 100 #define ADBG(fmt, ...) do { if (0) printk(fmt, ##__VA_ARGS__); } while (0) 101 #endif 102 103 #define INFINITY_LIFE_TIME 0xFFFFFFFF 104 105 static inline u32 cstamp_delta(unsigned long cstamp) 106 { 107 return (cstamp - INITIAL_JIFFIES) * 100UL / HZ; 108 } 109 110 #ifdef CONFIG_SYSCTL 111 static void addrconf_sysctl_register(struct inet6_dev *idev); 112 static void addrconf_sysctl_unregister(struct inet6_dev *idev); 113 #else 114 static inline void addrconf_sysctl_register(struct inet6_dev *idev) 115 { 116 } 117 118 static inline void addrconf_sysctl_unregister(struct inet6_dev *idev) 119 { 120 } 121 #endif 122 123 static void __ipv6_regen_rndid(struct inet6_dev *idev); 124 static void __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr); 125 static void ipv6_regen_rndid(unsigned long data); 126 127 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev); 128 static int ipv6_count_addresses(struct inet6_dev *idev); 129 130 /* 131 * Configured unicast address hash table 132 */ 133 static struct hlist_head inet6_addr_lst[IN6_ADDR_HSIZE]; 134 static DEFINE_SPINLOCK(addrconf_hash_lock); 135 136 static void addrconf_verify(unsigned long); 137 138 static DEFINE_TIMER(addr_chk_timer, addrconf_verify, 0, 0); 139 static DEFINE_SPINLOCK(addrconf_verify_lock); 140 141 static void addrconf_join_anycast(struct inet6_ifaddr *ifp); 142 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp); 143 144 static void addrconf_type_change(struct net_device *dev, 145 unsigned long event); 146 static int addrconf_ifdown(struct net_device *dev, int how); 147 148 static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx, 149 int plen, 150 const struct net_device *dev, 151 u32 flags, u32 noflags); 152 153 static void addrconf_dad_start(struct inet6_ifaddr *ifp); 154 static void addrconf_dad_timer(unsigned long data); 155 static void addrconf_dad_completed(struct inet6_ifaddr *ifp); 156 static void addrconf_dad_run(struct inet6_dev *idev); 157 static void addrconf_rs_timer(unsigned long data); 158 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa); 159 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa); 160 161 static void inet6_prefix_notify(int event, struct inet6_dev *idev, 162 struct prefix_info *pinfo); 163 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr, 164 struct net_device *dev); 165 166 static struct ipv6_devconf ipv6_devconf __read_mostly = { 167 .forwarding = 0, 168 .hop_limit = IPV6_DEFAULT_HOPLIMIT, 169 .mtu6 = IPV6_MIN_MTU, 170 .accept_ra = 1, 171 .accept_redirects = 1, 172 .autoconf = 1, 173 .force_mld_version = 0, 174 .mldv1_unsolicited_report_interval = 10 * HZ, 175 .mldv2_unsolicited_report_interval = HZ, 176 .dad_transmits = 1, 177 .rtr_solicits = MAX_RTR_SOLICITATIONS, 178 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL, 179 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY, 180 .use_tempaddr = 0, 181 .temp_valid_lft = TEMP_VALID_LIFETIME, 182 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME, 183 .regen_max_retry = REGEN_MAX_RETRY, 184 .max_desync_factor = MAX_DESYNC_FACTOR, 185 .max_addresses = IPV6_MAX_ADDRESSES, 186 .accept_ra_defrtr = 1, 187 .accept_ra_pinfo = 1, 188 #ifdef CONFIG_IPV6_ROUTER_PREF 189 .accept_ra_rtr_pref = 1, 190 .rtr_probe_interval = 60 * HZ, 191 #ifdef CONFIG_IPV6_ROUTE_INFO 192 .accept_ra_rt_info_max_plen = 0, 193 #endif 194 #endif 195 .proxy_ndp = 0, 196 .accept_source_route = 0, /* we do not accept RH0 by default. */ 197 .disable_ipv6 = 0, 198 .accept_dad = 1, 199 .suppress_frag_ndisc = 1, 200 }; 201 202 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = { 203 .forwarding = 0, 204 .hop_limit = IPV6_DEFAULT_HOPLIMIT, 205 .mtu6 = IPV6_MIN_MTU, 206 .accept_ra = 1, 207 .accept_redirects = 1, 208 .autoconf = 1, 209 .force_mld_version = 0, 210 .mldv1_unsolicited_report_interval = 10 * HZ, 211 .mldv2_unsolicited_report_interval = HZ, 212 .dad_transmits = 1, 213 .rtr_solicits = MAX_RTR_SOLICITATIONS, 214 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL, 215 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY, 216 .use_tempaddr = 0, 217 .temp_valid_lft = TEMP_VALID_LIFETIME, 218 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME, 219 .regen_max_retry = REGEN_MAX_RETRY, 220 .max_desync_factor = MAX_DESYNC_FACTOR, 221 .max_addresses = IPV6_MAX_ADDRESSES, 222 .accept_ra_defrtr = 1, 223 .accept_ra_pinfo = 1, 224 #ifdef CONFIG_IPV6_ROUTER_PREF 225 .accept_ra_rtr_pref = 1, 226 .rtr_probe_interval = 60 * HZ, 227 #ifdef CONFIG_IPV6_ROUTE_INFO 228 .accept_ra_rt_info_max_plen = 0, 229 #endif 230 #endif 231 .proxy_ndp = 0, 232 .accept_source_route = 0, /* we do not accept RH0 by default. */ 233 .disable_ipv6 = 0, 234 .accept_dad = 1, 235 .suppress_frag_ndisc = 1, 236 }; 237 238 /* Check if a valid qdisc is available */ 239 static inline bool addrconf_qdisc_ok(const struct net_device *dev) 240 { 241 return !qdisc_tx_is_noop(dev); 242 } 243 244 static void addrconf_del_rs_timer(struct inet6_dev *idev) 245 { 246 if (del_timer(&idev->rs_timer)) 247 __in6_dev_put(idev); 248 } 249 250 static void addrconf_del_dad_timer(struct inet6_ifaddr *ifp) 251 { 252 if (del_timer(&ifp->dad_timer)) 253 __in6_ifa_put(ifp); 254 } 255 256 static void addrconf_mod_rs_timer(struct inet6_dev *idev, 257 unsigned long when) 258 { 259 if (!timer_pending(&idev->rs_timer)) 260 in6_dev_hold(idev); 261 mod_timer(&idev->rs_timer, jiffies + when); 262 } 263 264 static void addrconf_mod_dad_timer(struct inet6_ifaddr *ifp, 265 unsigned long when) 266 { 267 if (!timer_pending(&ifp->dad_timer)) 268 in6_ifa_hold(ifp); 269 mod_timer(&ifp->dad_timer, jiffies + when); 270 } 271 272 static int snmp6_alloc_dev(struct inet6_dev *idev) 273 { 274 int i; 275 276 if (snmp_mib_init((void __percpu **)idev->stats.ipv6, 277 sizeof(struct ipstats_mib), 278 __alignof__(struct ipstats_mib)) < 0) 279 goto err_ip; 280 281 for_each_possible_cpu(i) { 282 struct ipstats_mib *addrconf_stats; 283 addrconf_stats = per_cpu_ptr(idev->stats.ipv6[0], i); 284 u64_stats_init(&addrconf_stats->syncp); 285 #if SNMP_ARRAY_SZ == 2 286 addrconf_stats = per_cpu_ptr(idev->stats.ipv6[1], i); 287 u64_stats_init(&addrconf_stats->syncp); 288 #endif 289 } 290 291 292 idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device), 293 GFP_KERNEL); 294 if (!idev->stats.icmpv6dev) 295 goto err_icmp; 296 idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device), 297 GFP_KERNEL); 298 if (!idev->stats.icmpv6msgdev) 299 goto err_icmpmsg; 300 301 return 0; 302 303 err_icmpmsg: 304 kfree(idev->stats.icmpv6dev); 305 err_icmp: 306 snmp_mib_free((void __percpu **)idev->stats.ipv6); 307 err_ip: 308 return -ENOMEM; 309 } 310 311 static struct inet6_dev *ipv6_add_dev(struct net_device *dev) 312 { 313 struct inet6_dev *ndev; 314 315 ASSERT_RTNL(); 316 317 if (dev->mtu < IPV6_MIN_MTU) 318 return NULL; 319 320 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL); 321 322 if (ndev == NULL) 323 return NULL; 324 325 rwlock_init(&ndev->lock); 326 ndev->dev = dev; 327 INIT_LIST_HEAD(&ndev->addr_list); 328 setup_timer(&ndev->rs_timer, addrconf_rs_timer, 329 (unsigned long)ndev); 330 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf)); 331 ndev->cnf.mtu6 = dev->mtu; 332 ndev->cnf.sysctl = NULL; 333 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl); 334 if (ndev->nd_parms == NULL) { 335 kfree(ndev); 336 return NULL; 337 } 338 if (ndev->cnf.forwarding) 339 dev_disable_lro(dev); 340 /* We refer to the device */ 341 dev_hold(dev); 342 343 if (snmp6_alloc_dev(ndev) < 0) { 344 ADBG(KERN_WARNING 345 "%s: cannot allocate memory for statistics; dev=%s.\n", 346 __func__, dev->name); 347 neigh_parms_release(&nd_tbl, ndev->nd_parms); 348 dev_put(dev); 349 kfree(ndev); 350 return NULL; 351 } 352 353 if (snmp6_register_dev(ndev) < 0) { 354 ADBG(KERN_WARNING 355 "%s: cannot create /proc/net/dev_snmp6/%s\n", 356 __func__, dev->name); 357 neigh_parms_release(&nd_tbl, ndev->nd_parms); 358 ndev->dead = 1; 359 in6_dev_finish_destroy(ndev); 360 return NULL; 361 } 362 363 /* One reference from device. We must do this before 364 * we invoke __ipv6_regen_rndid(). 365 */ 366 in6_dev_hold(ndev); 367 368 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK)) 369 ndev->cnf.accept_dad = -1; 370 371 #if IS_ENABLED(CONFIG_IPV6_SIT) 372 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) { 373 pr_info("%s: Disabled Multicast RS\n", dev->name); 374 ndev->cnf.rtr_solicits = 0; 375 } 376 #endif 377 378 INIT_LIST_HEAD(&ndev->tempaddr_list); 379 setup_timer(&ndev->regen_timer, ipv6_regen_rndid, (unsigned long)ndev); 380 if ((dev->flags&IFF_LOOPBACK) || 381 dev->type == ARPHRD_TUNNEL || 382 dev->type == ARPHRD_TUNNEL6 || 383 dev->type == ARPHRD_SIT || 384 dev->type == ARPHRD_NONE) { 385 ndev->cnf.use_tempaddr = -1; 386 } else { 387 in6_dev_hold(ndev); 388 ipv6_regen_rndid((unsigned long) ndev); 389 } 390 391 ndev->token = in6addr_any; 392 393 if (netif_running(dev) && addrconf_qdisc_ok(dev)) 394 ndev->if_flags |= IF_READY; 395 396 ipv6_mc_init_dev(ndev); 397 ndev->tstamp = jiffies; 398 addrconf_sysctl_register(ndev); 399 /* protected by rtnl_lock */ 400 rcu_assign_pointer(dev->ip6_ptr, ndev); 401 402 /* Join interface-local all-node multicast group */ 403 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allnodes); 404 405 /* Join all-node multicast group */ 406 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes); 407 408 /* Join all-router multicast group if forwarding is set */ 409 if (ndev->cnf.forwarding && (dev->flags & IFF_MULTICAST)) 410 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters); 411 412 return ndev; 413 } 414 415 static struct inet6_dev *ipv6_find_idev(struct net_device *dev) 416 { 417 struct inet6_dev *idev; 418 419 ASSERT_RTNL(); 420 421 idev = __in6_dev_get(dev); 422 if (!idev) { 423 idev = ipv6_add_dev(dev); 424 if (!idev) 425 return NULL; 426 } 427 428 if (dev->flags&IFF_UP) 429 ipv6_mc_up(idev); 430 return idev; 431 } 432 433 static int inet6_netconf_msgsize_devconf(int type) 434 { 435 int size = NLMSG_ALIGN(sizeof(struct netconfmsg)) 436 + nla_total_size(4); /* NETCONFA_IFINDEX */ 437 438 /* type -1 is used for ALL */ 439 if (type == -1 || type == NETCONFA_FORWARDING) 440 size += nla_total_size(4); 441 #ifdef CONFIG_IPV6_MROUTE 442 if (type == -1 || type == NETCONFA_MC_FORWARDING) 443 size += nla_total_size(4); 444 #endif 445 446 return size; 447 } 448 449 static int inet6_netconf_fill_devconf(struct sk_buff *skb, int ifindex, 450 struct ipv6_devconf *devconf, u32 portid, 451 u32 seq, int event, unsigned int flags, 452 int type) 453 { 454 struct nlmsghdr *nlh; 455 struct netconfmsg *ncm; 456 457 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg), 458 flags); 459 if (nlh == NULL) 460 return -EMSGSIZE; 461 462 ncm = nlmsg_data(nlh); 463 ncm->ncm_family = AF_INET6; 464 465 if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0) 466 goto nla_put_failure; 467 468 /* type -1 is used for ALL */ 469 if ((type == -1 || type == NETCONFA_FORWARDING) && 470 nla_put_s32(skb, NETCONFA_FORWARDING, devconf->forwarding) < 0) 471 goto nla_put_failure; 472 #ifdef CONFIG_IPV6_MROUTE 473 if ((type == -1 || type == NETCONFA_MC_FORWARDING) && 474 nla_put_s32(skb, NETCONFA_MC_FORWARDING, 475 devconf->mc_forwarding) < 0) 476 goto nla_put_failure; 477 #endif 478 return nlmsg_end(skb, nlh); 479 480 nla_put_failure: 481 nlmsg_cancel(skb, nlh); 482 return -EMSGSIZE; 483 } 484 485 void inet6_netconf_notify_devconf(struct net *net, int type, int ifindex, 486 struct ipv6_devconf *devconf) 487 { 488 struct sk_buff *skb; 489 int err = -ENOBUFS; 490 491 skb = nlmsg_new(inet6_netconf_msgsize_devconf(type), GFP_ATOMIC); 492 if (skb == NULL) 493 goto errout; 494 495 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 0, 0, 496 RTM_NEWNETCONF, 0, type); 497 if (err < 0) { 498 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */ 499 WARN_ON(err == -EMSGSIZE); 500 kfree_skb(skb); 501 goto errout; 502 } 503 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_NETCONF, NULL, GFP_ATOMIC); 504 return; 505 errout: 506 rtnl_set_sk_err(net, RTNLGRP_IPV6_NETCONF, err); 507 } 508 509 static const struct nla_policy devconf_ipv6_policy[NETCONFA_MAX+1] = { 510 [NETCONFA_IFINDEX] = { .len = sizeof(int) }, 511 [NETCONFA_FORWARDING] = { .len = sizeof(int) }, 512 }; 513 514 static int inet6_netconf_get_devconf(struct sk_buff *in_skb, 515 struct nlmsghdr *nlh) 516 { 517 struct net *net = sock_net(in_skb->sk); 518 struct nlattr *tb[NETCONFA_MAX+1]; 519 struct netconfmsg *ncm; 520 struct sk_buff *skb; 521 struct ipv6_devconf *devconf; 522 struct inet6_dev *in6_dev; 523 struct net_device *dev; 524 int ifindex; 525 int err; 526 527 err = nlmsg_parse(nlh, sizeof(*ncm), tb, NETCONFA_MAX, 528 devconf_ipv6_policy); 529 if (err < 0) 530 goto errout; 531 532 err = EINVAL; 533 if (!tb[NETCONFA_IFINDEX]) 534 goto errout; 535 536 ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]); 537 switch (ifindex) { 538 case NETCONFA_IFINDEX_ALL: 539 devconf = net->ipv6.devconf_all; 540 break; 541 case NETCONFA_IFINDEX_DEFAULT: 542 devconf = net->ipv6.devconf_dflt; 543 break; 544 default: 545 dev = __dev_get_by_index(net, ifindex); 546 if (dev == NULL) 547 goto errout; 548 in6_dev = __in6_dev_get(dev); 549 if (in6_dev == NULL) 550 goto errout; 551 devconf = &in6_dev->cnf; 552 break; 553 } 554 555 err = -ENOBUFS; 556 skb = nlmsg_new(inet6_netconf_msgsize_devconf(-1), GFP_ATOMIC); 557 if (skb == NULL) 558 goto errout; 559 560 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 561 NETLINK_CB(in_skb).portid, 562 nlh->nlmsg_seq, RTM_NEWNETCONF, 0, 563 -1); 564 if (err < 0) { 565 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */ 566 WARN_ON(err == -EMSGSIZE); 567 kfree_skb(skb); 568 goto errout; 569 } 570 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid); 571 errout: 572 return err; 573 } 574 575 static int inet6_netconf_dump_devconf(struct sk_buff *skb, 576 struct netlink_callback *cb) 577 { 578 struct net *net = sock_net(skb->sk); 579 int h, s_h; 580 int idx, s_idx; 581 struct net_device *dev; 582 struct inet6_dev *idev; 583 struct hlist_head *head; 584 585 s_h = cb->args[0]; 586 s_idx = idx = cb->args[1]; 587 588 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 589 idx = 0; 590 head = &net->dev_index_head[h]; 591 rcu_read_lock(); 592 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ 593 net->dev_base_seq; 594 hlist_for_each_entry_rcu(dev, head, index_hlist) { 595 if (idx < s_idx) 596 goto cont; 597 idev = __in6_dev_get(dev); 598 if (!idev) 599 goto cont; 600 601 if (inet6_netconf_fill_devconf(skb, dev->ifindex, 602 &idev->cnf, 603 NETLINK_CB(cb->skb).portid, 604 cb->nlh->nlmsg_seq, 605 RTM_NEWNETCONF, 606 NLM_F_MULTI, 607 -1) <= 0) { 608 rcu_read_unlock(); 609 goto done; 610 } 611 nl_dump_check_consistent(cb, nlmsg_hdr(skb)); 612 cont: 613 idx++; 614 } 615 rcu_read_unlock(); 616 } 617 if (h == NETDEV_HASHENTRIES) { 618 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL, 619 net->ipv6.devconf_all, 620 NETLINK_CB(cb->skb).portid, 621 cb->nlh->nlmsg_seq, 622 RTM_NEWNETCONF, NLM_F_MULTI, 623 -1) <= 0) 624 goto done; 625 else 626 h++; 627 } 628 if (h == NETDEV_HASHENTRIES + 1) { 629 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT, 630 net->ipv6.devconf_dflt, 631 NETLINK_CB(cb->skb).portid, 632 cb->nlh->nlmsg_seq, 633 RTM_NEWNETCONF, NLM_F_MULTI, 634 -1) <= 0) 635 goto done; 636 else 637 h++; 638 } 639 done: 640 cb->args[0] = h; 641 cb->args[1] = idx; 642 643 return skb->len; 644 } 645 646 #ifdef CONFIG_SYSCTL 647 static void dev_forward_change(struct inet6_dev *idev) 648 { 649 struct net_device *dev; 650 struct inet6_ifaddr *ifa; 651 652 if (!idev) 653 return; 654 dev = idev->dev; 655 if (idev->cnf.forwarding) 656 dev_disable_lro(dev); 657 if (dev->flags & IFF_MULTICAST) { 658 if (idev->cnf.forwarding) { 659 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters); 660 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allrouters); 661 ipv6_dev_mc_inc(dev, &in6addr_sitelocal_allrouters); 662 } else { 663 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters); 664 ipv6_dev_mc_dec(dev, &in6addr_interfacelocal_allrouters); 665 ipv6_dev_mc_dec(dev, &in6addr_sitelocal_allrouters); 666 } 667 } 668 669 list_for_each_entry(ifa, &idev->addr_list, if_list) { 670 if (ifa->flags&IFA_F_TENTATIVE) 671 continue; 672 if (idev->cnf.forwarding) 673 addrconf_join_anycast(ifa); 674 else 675 addrconf_leave_anycast(ifa); 676 } 677 inet6_netconf_notify_devconf(dev_net(dev), NETCONFA_FORWARDING, 678 dev->ifindex, &idev->cnf); 679 } 680 681 682 static void addrconf_forward_change(struct net *net, __s32 newf) 683 { 684 struct net_device *dev; 685 struct inet6_dev *idev; 686 687 for_each_netdev(net, dev) { 688 idev = __in6_dev_get(dev); 689 if (idev) { 690 int changed = (!idev->cnf.forwarding) ^ (!newf); 691 idev->cnf.forwarding = newf; 692 if (changed) 693 dev_forward_change(idev); 694 } 695 } 696 } 697 698 static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf) 699 { 700 struct net *net; 701 int old; 702 703 if (!rtnl_trylock()) 704 return restart_syscall(); 705 706 net = (struct net *)table->extra2; 707 old = *p; 708 *p = newf; 709 710 if (p == &net->ipv6.devconf_dflt->forwarding) { 711 if ((!newf) ^ (!old)) 712 inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING, 713 NETCONFA_IFINDEX_DEFAULT, 714 net->ipv6.devconf_dflt); 715 rtnl_unlock(); 716 return 0; 717 } 718 719 if (p == &net->ipv6.devconf_all->forwarding) { 720 net->ipv6.devconf_dflt->forwarding = newf; 721 addrconf_forward_change(net, newf); 722 if ((!newf) ^ (!old)) 723 inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING, 724 NETCONFA_IFINDEX_ALL, 725 net->ipv6.devconf_all); 726 } else if ((!newf) ^ (!old)) 727 dev_forward_change((struct inet6_dev *)table->extra1); 728 rtnl_unlock(); 729 730 if (newf) 731 rt6_purge_dflt_routers(net); 732 return 1; 733 } 734 #endif 735 736 /* Nobody refers to this ifaddr, destroy it */ 737 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp) 738 { 739 WARN_ON(!hlist_unhashed(&ifp->addr_lst)); 740 741 #ifdef NET_REFCNT_DEBUG 742 pr_debug("%s\n", __func__); 743 #endif 744 745 in6_dev_put(ifp->idev); 746 747 if (del_timer(&ifp->dad_timer)) 748 pr_notice("Timer is still running, when freeing ifa=%p\n", ifp); 749 750 if (ifp->state != INET6_IFADDR_STATE_DEAD) { 751 pr_warn("Freeing alive inet6 address %p\n", ifp); 752 return; 753 } 754 ip6_rt_put(ifp->rt); 755 756 kfree_rcu(ifp, rcu); 757 } 758 759 static void 760 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp) 761 { 762 struct list_head *p; 763 int ifp_scope = ipv6_addr_src_scope(&ifp->addr); 764 765 /* 766 * Each device address list is sorted in order of scope - 767 * global before linklocal. 768 */ 769 list_for_each(p, &idev->addr_list) { 770 struct inet6_ifaddr *ifa 771 = list_entry(p, struct inet6_ifaddr, if_list); 772 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr)) 773 break; 774 } 775 776 list_add_tail(&ifp->if_list, p); 777 } 778 779 static u32 inet6_addr_hash(const struct in6_addr *addr) 780 { 781 return hash_32(ipv6_addr_hash(addr), IN6_ADDR_HSIZE_SHIFT); 782 } 783 784 /* On success it returns ifp with increased reference count */ 785 786 static struct inet6_ifaddr * 787 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, 788 const struct in6_addr *peer_addr, int pfxlen, 789 int scope, u32 flags, u32 valid_lft, u32 prefered_lft) 790 { 791 struct inet6_ifaddr *ifa = NULL; 792 struct rt6_info *rt; 793 unsigned int hash; 794 int err = 0; 795 int addr_type = ipv6_addr_type(addr); 796 797 if (addr_type == IPV6_ADDR_ANY || 798 addr_type & IPV6_ADDR_MULTICAST || 799 (!(idev->dev->flags & IFF_LOOPBACK) && 800 addr_type & IPV6_ADDR_LOOPBACK)) 801 return ERR_PTR(-EADDRNOTAVAIL); 802 803 rcu_read_lock_bh(); 804 if (idev->dead) { 805 err = -ENODEV; /*XXX*/ 806 goto out2; 807 } 808 809 if (idev->cnf.disable_ipv6) { 810 err = -EACCES; 811 goto out2; 812 } 813 814 spin_lock(&addrconf_hash_lock); 815 816 /* Ignore adding duplicate addresses on an interface */ 817 if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) { 818 ADBG("ipv6_add_addr: already assigned\n"); 819 err = -EEXIST; 820 goto out; 821 } 822 823 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC); 824 825 if (ifa == NULL) { 826 ADBG("ipv6_add_addr: malloc failed\n"); 827 err = -ENOBUFS; 828 goto out; 829 } 830 831 rt = addrconf_dst_alloc(idev, addr, false); 832 if (IS_ERR(rt)) { 833 err = PTR_ERR(rt); 834 goto out; 835 } 836 837 ifa->addr = *addr; 838 if (peer_addr) 839 ifa->peer_addr = *peer_addr; 840 841 spin_lock_init(&ifa->lock); 842 spin_lock_init(&ifa->state_lock); 843 setup_timer(&ifa->dad_timer, addrconf_dad_timer, 844 (unsigned long)ifa); 845 INIT_HLIST_NODE(&ifa->addr_lst); 846 ifa->scope = scope; 847 ifa->prefix_len = pfxlen; 848 ifa->flags = flags | IFA_F_TENTATIVE; 849 ifa->valid_lft = valid_lft; 850 ifa->prefered_lft = prefered_lft; 851 ifa->cstamp = ifa->tstamp = jiffies; 852 ifa->tokenized = false; 853 854 ifa->rt = rt; 855 856 ifa->idev = idev; 857 in6_dev_hold(idev); 858 /* For caller */ 859 in6_ifa_hold(ifa); 860 861 /* Add to big hash table */ 862 hash = inet6_addr_hash(addr); 863 864 hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]); 865 spin_unlock(&addrconf_hash_lock); 866 867 write_lock(&idev->lock); 868 /* Add to inet6_dev unicast addr list. */ 869 ipv6_link_dev_addr(idev, ifa); 870 871 if (ifa->flags&IFA_F_TEMPORARY) { 872 list_add(&ifa->tmp_list, &idev->tempaddr_list); 873 in6_ifa_hold(ifa); 874 } 875 876 in6_ifa_hold(ifa); 877 write_unlock(&idev->lock); 878 out2: 879 rcu_read_unlock_bh(); 880 881 if (likely(err == 0)) 882 inet6addr_notifier_call_chain(NETDEV_UP, ifa); 883 else { 884 kfree(ifa); 885 ifa = ERR_PTR(err); 886 } 887 888 return ifa; 889 out: 890 spin_unlock(&addrconf_hash_lock); 891 goto out2; 892 } 893 894 /* This function wants to get referenced ifp and releases it before return */ 895 896 static void ipv6_del_addr(struct inet6_ifaddr *ifp) 897 { 898 struct inet6_ifaddr *ifa, *ifn; 899 struct inet6_dev *idev = ifp->idev; 900 int state; 901 int deleted = 0, onlink = 0; 902 unsigned long expires = jiffies; 903 904 spin_lock_bh(&ifp->state_lock); 905 state = ifp->state; 906 ifp->state = INET6_IFADDR_STATE_DEAD; 907 spin_unlock_bh(&ifp->state_lock); 908 909 if (state == INET6_IFADDR_STATE_DEAD) 910 goto out; 911 912 spin_lock_bh(&addrconf_hash_lock); 913 hlist_del_init_rcu(&ifp->addr_lst); 914 spin_unlock_bh(&addrconf_hash_lock); 915 916 write_lock_bh(&idev->lock); 917 918 if (ifp->flags&IFA_F_TEMPORARY) { 919 list_del(&ifp->tmp_list); 920 if (ifp->ifpub) { 921 in6_ifa_put(ifp->ifpub); 922 ifp->ifpub = NULL; 923 } 924 __in6_ifa_put(ifp); 925 } 926 927 list_for_each_entry_safe(ifa, ifn, &idev->addr_list, if_list) { 928 if (ifa == ifp) { 929 list_del_init(&ifp->if_list); 930 __in6_ifa_put(ifp); 931 932 if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0) 933 break; 934 deleted = 1; 935 continue; 936 } else if (ifp->flags & IFA_F_PERMANENT) { 937 if (ipv6_prefix_equal(&ifa->addr, &ifp->addr, 938 ifp->prefix_len)) { 939 if (ifa->flags & IFA_F_PERMANENT) { 940 onlink = 1; 941 if (deleted) 942 break; 943 } else { 944 unsigned long lifetime; 945 946 if (!onlink) 947 onlink = -1; 948 949 spin_lock(&ifa->lock); 950 951 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ); 952 /* 953 * Note: Because this address is 954 * not permanent, lifetime < 955 * LONG_MAX / HZ here. 956 */ 957 if (time_before(expires, 958 ifa->tstamp + lifetime * HZ)) 959 expires = ifa->tstamp + lifetime * HZ; 960 spin_unlock(&ifa->lock); 961 } 962 } 963 } 964 } 965 write_unlock_bh(&idev->lock); 966 967 addrconf_del_dad_timer(ifp); 968 969 ipv6_ifa_notify(RTM_DELADDR, ifp); 970 971 inet6addr_notifier_call_chain(NETDEV_DOWN, ifp); 972 973 /* 974 * Purge or update corresponding prefix 975 * 976 * 1) we don't purge prefix here if address was not permanent. 977 * prefix is managed by its own lifetime. 978 * 2) if there're no addresses, delete prefix. 979 * 3) if there're still other permanent address(es), 980 * corresponding prefix is still permanent. 981 * 4) otherwise, update prefix lifetime to the 982 * longest valid lifetime among the corresponding 983 * addresses on the device. 984 * Note: subsequent RA will update lifetime. 985 * 986 * --yoshfuji 987 */ 988 if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) { 989 struct in6_addr prefix; 990 struct rt6_info *rt; 991 992 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len); 993 994 rt = addrconf_get_prefix_route(&prefix, 995 ifp->prefix_len, 996 ifp->idev->dev, 997 0, RTF_GATEWAY | RTF_DEFAULT); 998 999 if (rt) { 1000 if (onlink == 0) { 1001 ip6_del_rt(rt); 1002 rt = NULL; 1003 } else if (!(rt->rt6i_flags & RTF_EXPIRES)) { 1004 rt6_set_expires(rt, expires); 1005 } 1006 } 1007 ip6_rt_put(rt); 1008 } 1009 1010 /* clean up prefsrc entries */ 1011 rt6_remove_prefsrc(ifp); 1012 out: 1013 in6_ifa_put(ifp); 1014 } 1015 1016 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift) 1017 { 1018 struct inet6_dev *idev = ifp->idev; 1019 struct in6_addr addr, *tmpaddr; 1020 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_tstamp, age; 1021 unsigned long regen_advance; 1022 int tmp_plen; 1023 int ret = 0; 1024 u32 addr_flags; 1025 unsigned long now = jiffies; 1026 1027 write_lock(&idev->lock); 1028 if (ift) { 1029 spin_lock_bh(&ift->lock); 1030 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8); 1031 spin_unlock_bh(&ift->lock); 1032 tmpaddr = &addr; 1033 } else { 1034 tmpaddr = NULL; 1035 } 1036 retry: 1037 in6_dev_hold(idev); 1038 if (idev->cnf.use_tempaddr <= 0) { 1039 write_unlock(&idev->lock); 1040 pr_info("%s: use_tempaddr is disabled\n", __func__); 1041 in6_dev_put(idev); 1042 ret = -1; 1043 goto out; 1044 } 1045 spin_lock_bh(&ifp->lock); 1046 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) { 1047 idev->cnf.use_tempaddr = -1; /*XXX*/ 1048 spin_unlock_bh(&ifp->lock); 1049 write_unlock(&idev->lock); 1050 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n", 1051 __func__); 1052 in6_dev_put(idev); 1053 ret = -1; 1054 goto out; 1055 } 1056 in6_ifa_hold(ifp); 1057 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8); 1058 __ipv6_try_regen_rndid(idev, tmpaddr); 1059 memcpy(&addr.s6_addr[8], idev->rndid, 8); 1060 age = (now - ifp->tstamp) / HZ; 1061 tmp_valid_lft = min_t(__u32, 1062 ifp->valid_lft, 1063 idev->cnf.temp_valid_lft + age); 1064 tmp_prefered_lft = min_t(__u32, 1065 ifp->prefered_lft, 1066 idev->cnf.temp_prefered_lft + age - 1067 idev->cnf.max_desync_factor); 1068 tmp_plen = ifp->prefix_len; 1069 tmp_tstamp = ifp->tstamp; 1070 spin_unlock_bh(&ifp->lock); 1071 1072 regen_advance = idev->cnf.regen_max_retry * 1073 idev->cnf.dad_transmits * 1074 idev->nd_parms->retrans_time / HZ; 1075 write_unlock(&idev->lock); 1076 1077 /* A temporary address is created only if this calculated Preferred 1078 * Lifetime is greater than REGEN_ADVANCE time units. In particular, 1079 * an implementation must not create a temporary address with a zero 1080 * Preferred Lifetime. 1081 */ 1082 if (tmp_prefered_lft <= regen_advance) { 1083 in6_ifa_put(ifp); 1084 in6_dev_put(idev); 1085 ret = -1; 1086 goto out; 1087 } 1088 1089 addr_flags = IFA_F_TEMPORARY; 1090 /* set in addrconf_prefix_rcv() */ 1091 if (ifp->flags & IFA_F_OPTIMISTIC) 1092 addr_flags |= IFA_F_OPTIMISTIC; 1093 1094 ift = ipv6_add_addr(idev, &addr, NULL, tmp_plen, 1095 ipv6_addr_scope(&addr), addr_flags, 1096 tmp_valid_lft, tmp_prefered_lft); 1097 if (IS_ERR(ift)) { 1098 in6_ifa_put(ifp); 1099 in6_dev_put(idev); 1100 pr_info("%s: retry temporary address regeneration\n", __func__); 1101 tmpaddr = &addr; 1102 write_lock(&idev->lock); 1103 goto retry; 1104 } 1105 1106 spin_lock_bh(&ift->lock); 1107 ift->ifpub = ifp; 1108 ift->cstamp = now; 1109 ift->tstamp = tmp_tstamp; 1110 spin_unlock_bh(&ift->lock); 1111 1112 addrconf_dad_start(ift); 1113 in6_ifa_put(ift); 1114 in6_dev_put(idev); 1115 out: 1116 return ret; 1117 } 1118 1119 /* 1120 * Choose an appropriate source address (RFC3484) 1121 */ 1122 enum { 1123 IPV6_SADDR_RULE_INIT = 0, 1124 IPV6_SADDR_RULE_LOCAL, 1125 IPV6_SADDR_RULE_SCOPE, 1126 IPV6_SADDR_RULE_PREFERRED, 1127 #ifdef CONFIG_IPV6_MIP6 1128 IPV6_SADDR_RULE_HOA, 1129 #endif 1130 IPV6_SADDR_RULE_OIF, 1131 IPV6_SADDR_RULE_LABEL, 1132 IPV6_SADDR_RULE_PRIVACY, 1133 IPV6_SADDR_RULE_ORCHID, 1134 IPV6_SADDR_RULE_PREFIX, 1135 IPV6_SADDR_RULE_MAX 1136 }; 1137 1138 struct ipv6_saddr_score { 1139 int rule; 1140 int addr_type; 1141 struct inet6_ifaddr *ifa; 1142 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX); 1143 int scopedist; 1144 int matchlen; 1145 }; 1146 1147 struct ipv6_saddr_dst { 1148 const struct in6_addr *addr; 1149 int ifindex; 1150 int scope; 1151 int label; 1152 unsigned int prefs; 1153 }; 1154 1155 static inline int ipv6_saddr_preferred(int type) 1156 { 1157 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK)) 1158 return 1; 1159 return 0; 1160 } 1161 1162 static int ipv6_get_saddr_eval(struct net *net, 1163 struct ipv6_saddr_score *score, 1164 struct ipv6_saddr_dst *dst, 1165 int i) 1166 { 1167 int ret; 1168 1169 if (i <= score->rule) { 1170 switch (i) { 1171 case IPV6_SADDR_RULE_SCOPE: 1172 ret = score->scopedist; 1173 break; 1174 case IPV6_SADDR_RULE_PREFIX: 1175 ret = score->matchlen; 1176 break; 1177 default: 1178 ret = !!test_bit(i, score->scorebits); 1179 } 1180 goto out; 1181 } 1182 1183 switch (i) { 1184 case IPV6_SADDR_RULE_INIT: 1185 /* Rule 0: remember if hiscore is not ready yet */ 1186 ret = !!score->ifa; 1187 break; 1188 case IPV6_SADDR_RULE_LOCAL: 1189 /* Rule 1: Prefer same address */ 1190 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr); 1191 break; 1192 case IPV6_SADDR_RULE_SCOPE: 1193 /* Rule 2: Prefer appropriate scope 1194 * 1195 * ret 1196 * ^ 1197 * -1 | d 15 1198 * ---+--+-+---> scope 1199 * | 1200 * | d is scope of the destination. 1201 * B-d | \ 1202 * | \ <- smaller scope is better if 1203 * B-15 | \ if scope is enough for destinaion. 1204 * | ret = B - scope (-1 <= scope >= d <= 15). 1205 * d-C-1 | / 1206 * |/ <- greater is better 1207 * -C / if scope is not enough for destination. 1208 * /| ret = scope - C (-1 <= d < scope <= 15). 1209 * 1210 * d - C - 1 < B -15 (for all -1 <= d <= 15). 1211 * C > d + 14 - B >= 15 + 14 - B = 29 - B. 1212 * Assume B = 0 and we get C > 29. 1213 */ 1214 ret = __ipv6_addr_src_scope(score->addr_type); 1215 if (ret >= dst->scope) 1216 ret = -ret; 1217 else 1218 ret -= 128; /* 30 is enough */ 1219 score->scopedist = ret; 1220 break; 1221 case IPV6_SADDR_RULE_PREFERRED: 1222 /* Rule 3: Avoid deprecated and optimistic addresses */ 1223 ret = ipv6_saddr_preferred(score->addr_type) || 1224 !(score->ifa->flags & (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC)); 1225 break; 1226 #ifdef CONFIG_IPV6_MIP6 1227 case IPV6_SADDR_RULE_HOA: 1228 { 1229 /* Rule 4: Prefer home address */ 1230 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA); 1231 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome; 1232 break; 1233 } 1234 #endif 1235 case IPV6_SADDR_RULE_OIF: 1236 /* Rule 5: Prefer outgoing interface */ 1237 ret = (!dst->ifindex || 1238 dst->ifindex == score->ifa->idev->dev->ifindex); 1239 break; 1240 case IPV6_SADDR_RULE_LABEL: 1241 /* Rule 6: Prefer matching label */ 1242 ret = ipv6_addr_label(net, 1243 &score->ifa->addr, score->addr_type, 1244 score->ifa->idev->dev->ifindex) == dst->label; 1245 break; 1246 case IPV6_SADDR_RULE_PRIVACY: 1247 { 1248 /* Rule 7: Prefer public address 1249 * Note: prefer temporary address if use_tempaddr >= 2 1250 */ 1251 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ? 1252 !!(dst->prefs & IPV6_PREFER_SRC_TMP) : 1253 score->ifa->idev->cnf.use_tempaddr >= 2; 1254 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp; 1255 break; 1256 } 1257 case IPV6_SADDR_RULE_ORCHID: 1258 /* Rule 8-: Prefer ORCHID vs ORCHID or 1259 * non-ORCHID vs non-ORCHID 1260 */ 1261 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^ 1262 ipv6_addr_orchid(dst->addr)); 1263 break; 1264 case IPV6_SADDR_RULE_PREFIX: 1265 /* Rule 8: Use longest matching prefix */ 1266 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr); 1267 if (ret > score->ifa->prefix_len) 1268 ret = score->ifa->prefix_len; 1269 score->matchlen = ret; 1270 break; 1271 default: 1272 ret = 0; 1273 } 1274 1275 if (ret) 1276 __set_bit(i, score->scorebits); 1277 score->rule = i; 1278 out: 1279 return ret; 1280 } 1281 1282 int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev, 1283 const struct in6_addr *daddr, unsigned int prefs, 1284 struct in6_addr *saddr) 1285 { 1286 struct ipv6_saddr_score scores[2], 1287 *score = &scores[0], *hiscore = &scores[1]; 1288 struct ipv6_saddr_dst dst; 1289 struct net_device *dev; 1290 int dst_type; 1291 1292 dst_type = __ipv6_addr_type(daddr); 1293 dst.addr = daddr; 1294 dst.ifindex = dst_dev ? dst_dev->ifindex : 0; 1295 dst.scope = __ipv6_addr_src_scope(dst_type); 1296 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex); 1297 dst.prefs = prefs; 1298 1299 hiscore->rule = -1; 1300 hiscore->ifa = NULL; 1301 1302 rcu_read_lock(); 1303 1304 for_each_netdev_rcu(net, dev) { 1305 struct inet6_dev *idev; 1306 1307 /* Candidate Source Address (section 4) 1308 * - multicast and link-local destination address, 1309 * the set of candidate source address MUST only 1310 * include addresses assigned to interfaces 1311 * belonging to the same link as the outgoing 1312 * interface. 1313 * (- For site-local destination addresses, the 1314 * set of candidate source addresses MUST only 1315 * include addresses assigned to interfaces 1316 * belonging to the same site as the outgoing 1317 * interface.) 1318 */ 1319 if (((dst_type & IPV6_ADDR_MULTICAST) || 1320 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL) && 1321 dst.ifindex && dev->ifindex != dst.ifindex) 1322 continue; 1323 1324 idev = __in6_dev_get(dev); 1325 if (!idev) 1326 continue; 1327 1328 read_lock_bh(&idev->lock); 1329 list_for_each_entry(score->ifa, &idev->addr_list, if_list) { 1330 int i; 1331 1332 /* 1333 * - Tentative Address (RFC2462 section 5.4) 1334 * - A tentative address is not considered 1335 * "assigned to an interface" in the traditional 1336 * sense, unless it is also flagged as optimistic. 1337 * - Candidate Source Address (section 4) 1338 * - In any case, anycast addresses, multicast 1339 * addresses, and the unspecified address MUST 1340 * NOT be included in a candidate set. 1341 */ 1342 if ((score->ifa->flags & IFA_F_TENTATIVE) && 1343 (!(score->ifa->flags & IFA_F_OPTIMISTIC))) 1344 continue; 1345 1346 score->addr_type = __ipv6_addr_type(&score->ifa->addr); 1347 1348 if (unlikely(score->addr_type == IPV6_ADDR_ANY || 1349 score->addr_type & IPV6_ADDR_MULTICAST)) { 1350 LIMIT_NETDEBUG(KERN_DEBUG 1351 "ADDRCONF: unspecified / multicast address " 1352 "assigned as unicast address on %s", 1353 dev->name); 1354 continue; 1355 } 1356 1357 score->rule = -1; 1358 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX); 1359 1360 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) { 1361 int minihiscore, miniscore; 1362 1363 minihiscore = ipv6_get_saddr_eval(net, hiscore, &dst, i); 1364 miniscore = ipv6_get_saddr_eval(net, score, &dst, i); 1365 1366 if (minihiscore > miniscore) { 1367 if (i == IPV6_SADDR_RULE_SCOPE && 1368 score->scopedist > 0) { 1369 /* 1370 * special case: 1371 * each remaining entry 1372 * has too small (not enough) 1373 * scope, because ifa entries 1374 * are sorted by their scope 1375 * values. 1376 */ 1377 goto try_nextdev; 1378 } 1379 break; 1380 } else if (minihiscore < miniscore) { 1381 if (hiscore->ifa) 1382 in6_ifa_put(hiscore->ifa); 1383 1384 in6_ifa_hold(score->ifa); 1385 1386 swap(hiscore, score); 1387 1388 /* restore our iterator */ 1389 score->ifa = hiscore->ifa; 1390 1391 break; 1392 } 1393 } 1394 } 1395 try_nextdev: 1396 read_unlock_bh(&idev->lock); 1397 } 1398 rcu_read_unlock(); 1399 1400 if (!hiscore->ifa) 1401 return -EADDRNOTAVAIL; 1402 1403 *saddr = hiscore->ifa->addr; 1404 in6_ifa_put(hiscore->ifa); 1405 return 0; 1406 } 1407 EXPORT_SYMBOL(ipv6_dev_get_saddr); 1408 1409 int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr, 1410 unsigned char banned_flags) 1411 { 1412 struct inet6_ifaddr *ifp; 1413 int err = -EADDRNOTAVAIL; 1414 1415 list_for_each_entry(ifp, &idev->addr_list, if_list) { 1416 if (ifp->scope == IFA_LINK && 1417 !(ifp->flags & banned_flags)) { 1418 *addr = ifp->addr; 1419 err = 0; 1420 break; 1421 } 1422 } 1423 return err; 1424 } 1425 1426 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr, 1427 unsigned char banned_flags) 1428 { 1429 struct inet6_dev *idev; 1430 int err = -EADDRNOTAVAIL; 1431 1432 rcu_read_lock(); 1433 idev = __in6_dev_get(dev); 1434 if (idev) { 1435 read_lock_bh(&idev->lock); 1436 err = __ipv6_get_lladdr(idev, addr, banned_flags); 1437 read_unlock_bh(&idev->lock); 1438 } 1439 rcu_read_unlock(); 1440 return err; 1441 } 1442 1443 static int ipv6_count_addresses(struct inet6_dev *idev) 1444 { 1445 int cnt = 0; 1446 struct inet6_ifaddr *ifp; 1447 1448 read_lock_bh(&idev->lock); 1449 list_for_each_entry(ifp, &idev->addr_list, if_list) 1450 cnt++; 1451 read_unlock_bh(&idev->lock); 1452 return cnt; 1453 } 1454 1455 int ipv6_chk_addr(struct net *net, const struct in6_addr *addr, 1456 const struct net_device *dev, int strict) 1457 { 1458 struct inet6_ifaddr *ifp; 1459 unsigned int hash = inet6_addr_hash(addr); 1460 1461 rcu_read_lock_bh(); 1462 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) { 1463 if (!net_eq(dev_net(ifp->idev->dev), net)) 1464 continue; 1465 if (ipv6_addr_equal(&ifp->addr, addr) && 1466 !(ifp->flags&IFA_F_TENTATIVE) && 1467 (dev == NULL || ifp->idev->dev == dev || 1468 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) { 1469 rcu_read_unlock_bh(); 1470 return 1; 1471 } 1472 } 1473 1474 rcu_read_unlock_bh(); 1475 return 0; 1476 } 1477 EXPORT_SYMBOL(ipv6_chk_addr); 1478 1479 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr, 1480 struct net_device *dev) 1481 { 1482 unsigned int hash = inet6_addr_hash(addr); 1483 struct inet6_ifaddr *ifp; 1484 1485 hlist_for_each_entry(ifp, &inet6_addr_lst[hash], addr_lst) { 1486 if (!net_eq(dev_net(ifp->idev->dev), net)) 1487 continue; 1488 if (ipv6_addr_equal(&ifp->addr, addr)) { 1489 if (dev == NULL || ifp->idev->dev == dev) 1490 return true; 1491 } 1492 } 1493 return false; 1494 } 1495 1496 /* Compares an address/prefix_len with addresses on device @dev. 1497 * If one is found it returns true. 1498 */ 1499 bool ipv6_chk_custom_prefix(const struct in6_addr *addr, 1500 const unsigned int prefix_len, struct net_device *dev) 1501 { 1502 struct inet6_dev *idev; 1503 struct inet6_ifaddr *ifa; 1504 bool ret = false; 1505 1506 rcu_read_lock(); 1507 idev = __in6_dev_get(dev); 1508 if (idev) { 1509 read_lock_bh(&idev->lock); 1510 list_for_each_entry(ifa, &idev->addr_list, if_list) { 1511 ret = ipv6_prefix_equal(addr, &ifa->addr, prefix_len); 1512 if (ret) 1513 break; 1514 } 1515 read_unlock_bh(&idev->lock); 1516 } 1517 rcu_read_unlock(); 1518 1519 return ret; 1520 } 1521 EXPORT_SYMBOL(ipv6_chk_custom_prefix); 1522 1523 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev) 1524 { 1525 struct inet6_dev *idev; 1526 struct inet6_ifaddr *ifa; 1527 int onlink; 1528 1529 onlink = 0; 1530 rcu_read_lock(); 1531 idev = __in6_dev_get(dev); 1532 if (idev) { 1533 read_lock_bh(&idev->lock); 1534 list_for_each_entry(ifa, &idev->addr_list, if_list) { 1535 onlink = ipv6_prefix_equal(addr, &ifa->addr, 1536 ifa->prefix_len); 1537 if (onlink) 1538 break; 1539 } 1540 read_unlock_bh(&idev->lock); 1541 } 1542 rcu_read_unlock(); 1543 return onlink; 1544 } 1545 EXPORT_SYMBOL(ipv6_chk_prefix); 1546 1547 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr, 1548 struct net_device *dev, int strict) 1549 { 1550 struct inet6_ifaddr *ifp, *result = NULL; 1551 unsigned int hash = inet6_addr_hash(addr); 1552 1553 rcu_read_lock_bh(); 1554 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) { 1555 if (!net_eq(dev_net(ifp->idev->dev), net)) 1556 continue; 1557 if (ipv6_addr_equal(&ifp->addr, addr)) { 1558 if (dev == NULL || ifp->idev->dev == dev || 1559 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) { 1560 result = ifp; 1561 in6_ifa_hold(ifp); 1562 break; 1563 } 1564 } 1565 } 1566 rcu_read_unlock_bh(); 1567 1568 return result; 1569 } 1570 1571 /* Gets referenced address, destroys ifaddr */ 1572 1573 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed) 1574 { 1575 if (ifp->flags&IFA_F_PERMANENT) { 1576 spin_lock_bh(&ifp->lock); 1577 addrconf_del_dad_timer(ifp); 1578 ifp->flags |= IFA_F_TENTATIVE; 1579 if (dad_failed) 1580 ifp->flags |= IFA_F_DADFAILED; 1581 spin_unlock_bh(&ifp->lock); 1582 if (dad_failed) 1583 ipv6_ifa_notify(0, ifp); 1584 in6_ifa_put(ifp); 1585 } else if (ifp->flags&IFA_F_TEMPORARY) { 1586 struct inet6_ifaddr *ifpub; 1587 spin_lock_bh(&ifp->lock); 1588 ifpub = ifp->ifpub; 1589 if (ifpub) { 1590 in6_ifa_hold(ifpub); 1591 spin_unlock_bh(&ifp->lock); 1592 ipv6_create_tempaddr(ifpub, ifp); 1593 in6_ifa_put(ifpub); 1594 } else { 1595 spin_unlock_bh(&ifp->lock); 1596 } 1597 ipv6_del_addr(ifp); 1598 } else 1599 ipv6_del_addr(ifp); 1600 } 1601 1602 static int addrconf_dad_end(struct inet6_ifaddr *ifp) 1603 { 1604 int err = -ENOENT; 1605 1606 spin_lock(&ifp->state_lock); 1607 if (ifp->state == INET6_IFADDR_STATE_DAD) { 1608 ifp->state = INET6_IFADDR_STATE_POSTDAD; 1609 err = 0; 1610 } 1611 spin_unlock(&ifp->state_lock); 1612 1613 return err; 1614 } 1615 1616 void addrconf_dad_failure(struct inet6_ifaddr *ifp) 1617 { 1618 struct inet6_dev *idev = ifp->idev; 1619 1620 if (addrconf_dad_end(ifp)) { 1621 in6_ifa_put(ifp); 1622 return; 1623 } 1624 1625 net_info_ratelimited("%s: IPv6 duplicate address %pI6c detected!\n", 1626 ifp->idev->dev->name, &ifp->addr); 1627 1628 if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6) { 1629 struct in6_addr addr; 1630 1631 addr.s6_addr32[0] = htonl(0xfe800000); 1632 addr.s6_addr32[1] = 0; 1633 1634 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) && 1635 ipv6_addr_equal(&ifp->addr, &addr)) { 1636 /* DAD failed for link-local based on MAC address */ 1637 idev->cnf.disable_ipv6 = 1; 1638 1639 pr_info("%s: IPv6 being disabled!\n", 1640 ifp->idev->dev->name); 1641 } 1642 } 1643 1644 addrconf_dad_stop(ifp, 1); 1645 } 1646 1647 /* Join to solicited addr multicast group. */ 1648 1649 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr) 1650 { 1651 struct in6_addr maddr; 1652 1653 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP)) 1654 return; 1655 1656 addrconf_addr_solict_mult(addr, &maddr); 1657 ipv6_dev_mc_inc(dev, &maddr); 1658 } 1659 1660 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr) 1661 { 1662 struct in6_addr maddr; 1663 1664 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP)) 1665 return; 1666 1667 addrconf_addr_solict_mult(addr, &maddr); 1668 __ipv6_dev_mc_dec(idev, &maddr); 1669 } 1670 1671 static void addrconf_join_anycast(struct inet6_ifaddr *ifp) 1672 { 1673 struct in6_addr addr; 1674 if (ifp->prefix_len == 127) /* RFC 6164 */ 1675 return; 1676 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len); 1677 if (ipv6_addr_any(&addr)) 1678 return; 1679 ipv6_dev_ac_inc(ifp->idev->dev, &addr); 1680 } 1681 1682 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp) 1683 { 1684 struct in6_addr addr; 1685 if (ifp->prefix_len == 127) /* RFC 6164 */ 1686 return; 1687 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len); 1688 if (ipv6_addr_any(&addr)) 1689 return; 1690 __ipv6_dev_ac_dec(ifp->idev, &addr); 1691 } 1692 1693 static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev) 1694 { 1695 if (dev->addr_len != ETH_ALEN) 1696 return -1; 1697 memcpy(eui, dev->dev_addr, 3); 1698 memcpy(eui + 5, dev->dev_addr + 3, 3); 1699 1700 /* 1701 * The zSeries OSA network cards can be shared among various 1702 * OS instances, but the OSA cards have only one MAC address. 1703 * This leads to duplicate address conflicts in conjunction 1704 * with IPv6 if more than one instance uses the same card. 1705 * 1706 * The driver for these cards can deliver a unique 16-bit 1707 * identifier for each instance sharing the same card. It is 1708 * placed instead of 0xFFFE in the interface identifier. The 1709 * "u" bit of the interface identifier is not inverted in this 1710 * case. Hence the resulting interface identifier has local 1711 * scope according to RFC2373. 1712 */ 1713 if (dev->dev_id) { 1714 eui[3] = (dev->dev_id >> 8) & 0xFF; 1715 eui[4] = dev->dev_id & 0xFF; 1716 } else { 1717 eui[3] = 0xFF; 1718 eui[4] = 0xFE; 1719 eui[0] ^= 2; 1720 } 1721 return 0; 1722 } 1723 1724 static int addrconf_ifid_eui64(u8 *eui, struct net_device *dev) 1725 { 1726 if (dev->addr_len != IEEE802154_ADDR_LEN) 1727 return -1; 1728 memcpy(eui, dev->dev_addr, 8); 1729 eui[0] ^= 2; 1730 return 0; 1731 } 1732 1733 static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev) 1734 { 1735 union fwnet_hwaddr *ha; 1736 1737 if (dev->addr_len != FWNET_ALEN) 1738 return -1; 1739 1740 ha = (union fwnet_hwaddr *)dev->dev_addr; 1741 1742 memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id)); 1743 eui[0] ^= 2; 1744 return 0; 1745 } 1746 1747 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev) 1748 { 1749 /* XXX: inherit EUI-64 from other interface -- yoshfuji */ 1750 if (dev->addr_len != ARCNET_ALEN) 1751 return -1; 1752 memset(eui, 0, 7); 1753 eui[7] = *(u8 *)dev->dev_addr; 1754 return 0; 1755 } 1756 1757 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev) 1758 { 1759 if (dev->addr_len != INFINIBAND_ALEN) 1760 return -1; 1761 memcpy(eui, dev->dev_addr + 12, 8); 1762 eui[0] |= 2; 1763 return 0; 1764 } 1765 1766 static int __ipv6_isatap_ifid(u8 *eui, __be32 addr) 1767 { 1768 if (addr == 0) 1769 return -1; 1770 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) || 1771 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) || 1772 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) || 1773 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) || 1774 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) || 1775 ipv4_is_lbcast(addr)) ? 0x00 : 0x02; 1776 eui[1] = 0; 1777 eui[2] = 0x5E; 1778 eui[3] = 0xFE; 1779 memcpy(eui + 4, &addr, 4); 1780 return 0; 1781 } 1782 1783 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev) 1784 { 1785 if (dev->priv_flags & IFF_ISATAP) 1786 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr); 1787 return -1; 1788 } 1789 1790 static int addrconf_ifid_gre(u8 *eui, struct net_device *dev) 1791 { 1792 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr); 1793 } 1794 1795 static int addrconf_ifid_ip6tnl(u8 *eui, struct net_device *dev) 1796 { 1797 memcpy(eui, dev->perm_addr, 3); 1798 memcpy(eui + 5, dev->perm_addr + 3, 3); 1799 eui[3] = 0xFF; 1800 eui[4] = 0xFE; 1801 eui[0] ^= 2; 1802 return 0; 1803 } 1804 1805 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev) 1806 { 1807 switch (dev->type) { 1808 case ARPHRD_ETHER: 1809 case ARPHRD_FDDI: 1810 return addrconf_ifid_eui48(eui, dev); 1811 case ARPHRD_ARCNET: 1812 return addrconf_ifid_arcnet(eui, dev); 1813 case ARPHRD_INFINIBAND: 1814 return addrconf_ifid_infiniband(eui, dev); 1815 case ARPHRD_SIT: 1816 return addrconf_ifid_sit(eui, dev); 1817 case ARPHRD_IPGRE: 1818 return addrconf_ifid_gre(eui, dev); 1819 case ARPHRD_IEEE802154: 1820 return addrconf_ifid_eui64(eui, dev); 1821 case ARPHRD_IEEE1394: 1822 return addrconf_ifid_ieee1394(eui, dev); 1823 case ARPHRD_TUNNEL6: 1824 return addrconf_ifid_ip6tnl(eui, dev); 1825 } 1826 return -1; 1827 } 1828 1829 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev) 1830 { 1831 int err = -1; 1832 struct inet6_ifaddr *ifp; 1833 1834 read_lock_bh(&idev->lock); 1835 list_for_each_entry(ifp, &idev->addr_list, if_list) { 1836 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) { 1837 memcpy(eui, ifp->addr.s6_addr+8, 8); 1838 err = 0; 1839 break; 1840 } 1841 } 1842 read_unlock_bh(&idev->lock); 1843 return err; 1844 } 1845 1846 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */ 1847 static void __ipv6_regen_rndid(struct inet6_dev *idev) 1848 { 1849 regen: 1850 get_random_bytes(idev->rndid, sizeof(idev->rndid)); 1851 idev->rndid[0] &= ~0x02; 1852 1853 /* 1854 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>: 1855 * check if generated address is not inappropriate 1856 * 1857 * - Reserved subnet anycast (RFC 2526) 1858 * 11111101 11....11 1xxxxxxx 1859 * - ISATAP (RFC4214) 6.1 1860 * 00-00-5E-FE-xx-xx-xx-xx 1861 * - value 0 1862 * - XXX: already assigned to an address on the device 1863 */ 1864 if (idev->rndid[0] == 0xfd && 1865 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff && 1866 (idev->rndid[7]&0x80)) 1867 goto regen; 1868 if ((idev->rndid[0]|idev->rndid[1]) == 0) { 1869 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe) 1870 goto regen; 1871 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00) 1872 goto regen; 1873 } 1874 } 1875 1876 static void ipv6_regen_rndid(unsigned long data) 1877 { 1878 struct inet6_dev *idev = (struct inet6_dev *) data; 1879 unsigned long expires; 1880 1881 rcu_read_lock_bh(); 1882 write_lock_bh(&idev->lock); 1883 1884 if (idev->dead) 1885 goto out; 1886 1887 __ipv6_regen_rndid(idev); 1888 1889 expires = jiffies + 1890 idev->cnf.temp_prefered_lft * HZ - 1891 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time - 1892 idev->cnf.max_desync_factor * HZ; 1893 if (time_before(expires, jiffies)) { 1894 pr_warn("%s: too short regeneration interval; timer disabled for %s\n", 1895 __func__, idev->dev->name); 1896 goto out; 1897 } 1898 1899 if (!mod_timer(&idev->regen_timer, expires)) 1900 in6_dev_hold(idev); 1901 1902 out: 1903 write_unlock_bh(&idev->lock); 1904 rcu_read_unlock_bh(); 1905 in6_dev_put(idev); 1906 } 1907 1908 static void __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) 1909 { 1910 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0) 1911 __ipv6_regen_rndid(idev); 1912 } 1913 1914 /* 1915 * Add prefix route. 1916 */ 1917 1918 static void 1919 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev, 1920 unsigned long expires, u32 flags) 1921 { 1922 struct fib6_config cfg = { 1923 .fc_table = RT6_TABLE_PREFIX, 1924 .fc_metric = IP6_RT_PRIO_ADDRCONF, 1925 .fc_ifindex = dev->ifindex, 1926 .fc_expires = expires, 1927 .fc_dst_len = plen, 1928 .fc_flags = RTF_UP | flags, 1929 .fc_nlinfo.nl_net = dev_net(dev), 1930 .fc_protocol = RTPROT_KERNEL, 1931 }; 1932 1933 cfg.fc_dst = *pfx; 1934 1935 /* Prevent useless cloning on PtP SIT. 1936 This thing is done here expecting that the whole 1937 class of non-broadcast devices need not cloning. 1938 */ 1939 #if IS_ENABLED(CONFIG_IPV6_SIT) 1940 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT)) 1941 cfg.fc_flags |= RTF_NONEXTHOP; 1942 #endif 1943 1944 ip6_route_add(&cfg); 1945 } 1946 1947 1948 static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx, 1949 int plen, 1950 const struct net_device *dev, 1951 u32 flags, u32 noflags) 1952 { 1953 struct fib6_node *fn; 1954 struct rt6_info *rt = NULL; 1955 struct fib6_table *table; 1956 1957 table = fib6_get_table(dev_net(dev), RT6_TABLE_PREFIX); 1958 if (table == NULL) 1959 return NULL; 1960 1961 read_lock_bh(&table->tb6_lock); 1962 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0); 1963 if (!fn) 1964 goto out; 1965 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) { 1966 if (rt->dst.dev->ifindex != dev->ifindex) 1967 continue; 1968 if ((rt->rt6i_flags & flags) != flags) 1969 continue; 1970 if ((rt->rt6i_flags & noflags) != 0) 1971 continue; 1972 dst_hold(&rt->dst); 1973 break; 1974 } 1975 out: 1976 read_unlock_bh(&table->tb6_lock); 1977 return rt; 1978 } 1979 1980 1981 /* Create "default" multicast route to the interface */ 1982 1983 static void addrconf_add_mroute(struct net_device *dev) 1984 { 1985 struct fib6_config cfg = { 1986 .fc_table = RT6_TABLE_LOCAL, 1987 .fc_metric = IP6_RT_PRIO_ADDRCONF, 1988 .fc_ifindex = dev->ifindex, 1989 .fc_dst_len = 8, 1990 .fc_flags = RTF_UP, 1991 .fc_nlinfo.nl_net = dev_net(dev), 1992 }; 1993 1994 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0); 1995 1996 ip6_route_add(&cfg); 1997 } 1998 1999 static struct inet6_dev *addrconf_add_dev(struct net_device *dev) 2000 { 2001 struct inet6_dev *idev; 2002 2003 ASSERT_RTNL(); 2004 2005 idev = ipv6_find_idev(dev); 2006 if (!idev) 2007 return ERR_PTR(-ENOBUFS); 2008 2009 if (idev->cnf.disable_ipv6) 2010 return ERR_PTR(-EACCES); 2011 2012 /* Add default multicast route */ 2013 if (!(dev->flags & IFF_LOOPBACK)) 2014 addrconf_add_mroute(dev); 2015 2016 return idev; 2017 } 2018 2019 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao) 2020 { 2021 struct prefix_info *pinfo; 2022 __u32 valid_lft; 2023 __u32 prefered_lft; 2024 int addr_type; 2025 struct inet6_dev *in6_dev; 2026 struct net *net = dev_net(dev); 2027 2028 pinfo = (struct prefix_info *) opt; 2029 2030 if (len < sizeof(struct prefix_info)) { 2031 ADBG("addrconf: prefix option too short\n"); 2032 return; 2033 } 2034 2035 /* 2036 * Validation checks ([ADDRCONF], page 19) 2037 */ 2038 2039 addr_type = ipv6_addr_type(&pinfo->prefix); 2040 2041 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL)) 2042 return; 2043 2044 valid_lft = ntohl(pinfo->valid); 2045 prefered_lft = ntohl(pinfo->prefered); 2046 2047 if (prefered_lft > valid_lft) { 2048 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n"); 2049 return; 2050 } 2051 2052 in6_dev = in6_dev_get(dev); 2053 2054 if (in6_dev == NULL) { 2055 net_dbg_ratelimited("addrconf: device %s not configured\n", 2056 dev->name); 2057 return; 2058 } 2059 2060 /* 2061 * Two things going on here: 2062 * 1) Add routes for on-link prefixes 2063 * 2) Configure prefixes with the auto flag set 2064 */ 2065 2066 if (pinfo->onlink) { 2067 struct rt6_info *rt; 2068 unsigned long rt_expires; 2069 2070 /* Avoid arithmetic overflow. Really, we could 2071 * save rt_expires in seconds, likely valid_lft, 2072 * but it would require division in fib gc, that it 2073 * not good. 2074 */ 2075 if (HZ > USER_HZ) 2076 rt_expires = addrconf_timeout_fixup(valid_lft, HZ); 2077 else 2078 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ); 2079 2080 if (addrconf_finite_timeout(rt_expires)) 2081 rt_expires *= HZ; 2082 2083 rt = addrconf_get_prefix_route(&pinfo->prefix, 2084 pinfo->prefix_len, 2085 dev, 2086 RTF_ADDRCONF | RTF_PREFIX_RT, 2087 RTF_GATEWAY | RTF_DEFAULT); 2088 2089 if (rt) { 2090 /* Autoconf prefix route */ 2091 if (valid_lft == 0) { 2092 ip6_del_rt(rt); 2093 rt = NULL; 2094 } else if (addrconf_finite_timeout(rt_expires)) { 2095 /* not infinity */ 2096 rt6_set_expires(rt, jiffies + rt_expires); 2097 } else { 2098 rt6_clean_expires(rt); 2099 } 2100 } else if (valid_lft) { 2101 clock_t expires = 0; 2102 int flags = RTF_ADDRCONF | RTF_PREFIX_RT; 2103 if (addrconf_finite_timeout(rt_expires)) { 2104 /* not infinity */ 2105 flags |= RTF_EXPIRES; 2106 expires = jiffies_to_clock_t(rt_expires); 2107 } 2108 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len, 2109 dev, expires, flags); 2110 } 2111 ip6_rt_put(rt); 2112 } 2113 2114 /* Try to figure out our local address for this prefix */ 2115 2116 if (pinfo->autoconf && in6_dev->cnf.autoconf) { 2117 struct inet6_ifaddr *ifp; 2118 struct in6_addr addr; 2119 int create = 0, update_lft = 0; 2120 bool tokenized = false; 2121 2122 if (pinfo->prefix_len == 64) { 2123 memcpy(&addr, &pinfo->prefix, 8); 2124 2125 if (!ipv6_addr_any(&in6_dev->token)) { 2126 read_lock_bh(&in6_dev->lock); 2127 memcpy(addr.s6_addr + 8, 2128 in6_dev->token.s6_addr + 8, 8); 2129 read_unlock_bh(&in6_dev->lock); 2130 tokenized = true; 2131 } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) && 2132 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) { 2133 in6_dev_put(in6_dev); 2134 return; 2135 } 2136 goto ok; 2137 } 2138 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n", 2139 pinfo->prefix_len); 2140 in6_dev_put(in6_dev); 2141 return; 2142 2143 ok: 2144 2145 ifp = ipv6_get_ifaddr(net, &addr, dev, 1); 2146 2147 if (ifp == NULL && valid_lft) { 2148 int max_addresses = in6_dev->cnf.max_addresses; 2149 u32 addr_flags = 0; 2150 2151 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 2152 if (in6_dev->cnf.optimistic_dad && 2153 !net->ipv6.devconf_all->forwarding && sllao) 2154 addr_flags = IFA_F_OPTIMISTIC; 2155 #endif 2156 2157 /* Do not allow to create too much of autoconfigured 2158 * addresses; this would be too easy way to crash kernel. 2159 */ 2160 if (!max_addresses || 2161 ipv6_count_addresses(in6_dev) < max_addresses) 2162 ifp = ipv6_add_addr(in6_dev, &addr, NULL, 2163 pinfo->prefix_len, 2164 addr_type&IPV6_ADDR_SCOPE_MASK, 2165 addr_flags, valid_lft, 2166 prefered_lft); 2167 2168 if (IS_ERR_OR_NULL(ifp)) { 2169 in6_dev_put(in6_dev); 2170 return; 2171 } 2172 2173 update_lft = 0; 2174 create = 1; 2175 ifp->cstamp = jiffies; 2176 ifp->tokenized = tokenized; 2177 addrconf_dad_start(ifp); 2178 } 2179 2180 if (ifp) { 2181 int flags; 2182 unsigned long now; 2183 struct inet6_ifaddr *ift; 2184 u32 stored_lft; 2185 2186 /* update lifetime (RFC2462 5.5.3 e) */ 2187 spin_lock(&ifp->lock); 2188 now = jiffies; 2189 if (ifp->valid_lft > (now - ifp->tstamp) / HZ) 2190 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ; 2191 else 2192 stored_lft = 0; 2193 if (!update_lft && !create && stored_lft) { 2194 const u32 minimum_lft = min( 2195 stored_lft, (u32)MIN_VALID_LIFETIME); 2196 valid_lft = max(valid_lft, minimum_lft); 2197 2198 /* RFC4862 Section 5.5.3e: 2199 * "Note that the preferred lifetime of the 2200 * corresponding address is always reset to 2201 * the Preferred Lifetime in the received 2202 * Prefix Information option, regardless of 2203 * whether the valid lifetime is also reset or 2204 * ignored." 2205 * 2206 * So we should always update prefered_lft here. 2207 */ 2208 update_lft = 1; 2209 } 2210 2211 if (update_lft) { 2212 ifp->valid_lft = valid_lft; 2213 ifp->prefered_lft = prefered_lft; 2214 ifp->tstamp = now; 2215 flags = ifp->flags; 2216 ifp->flags &= ~IFA_F_DEPRECATED; 2217 spin_unlock(&ifp->lock); 2218 2219 if (!(flags&IFA_F_TENTATIVE)) 2220 ipv6_ifa_notify(0, ifp); 2221 } else 2222 spin_unlock(&ifp->lock); 2223 2224 read_lock_bh(&in6_dev->lock); 2225 /* update all temporary addresses in the list */ 2226 list_for_each_entry(ift, &in6_dev->tempaddr_list, 2227 tmp_list) { 2228 int age, max_valid, max_prefered; 2229 2230 if (ifp != ift->ifpub) 2231 continue; 2232 2233 /* 2234 * RFC 4941 section 3.3: 2235 * If a received option will extend the lifetime 2236 * of a public address, the lifetimes of 2237 * temporary addresses should be extended, 2238 * subject to the overall constraint that no 2239 * temporary addresses should ever remain 2240 * "valid" or "preferred" for a time longer than 2241 * (TEMP_VALID_LIFETIME) or 2242 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), 2243 * respectively. 2244 */ 2245 age = (now - ift->cstamp) / HZ; 2246 max_valid = in6_dev->cnf.temp_valid_lft - age; 2247 if (max_valid < 0) 2248 max_valid = 0; 2249 2250 max_prefered = in6_dev->cnf.temp_prefered_lft - 2251 in6_dev->cnf.max_desync_factor - 2252 age; 2253 if (max_prefered < 0) 2254 max_prefered = 0; 2255 2256 if (valid_lft > max_valid) 2257 valid_lft = max_valid; 2258 2259 if (prefered_lft > max_prefered) 2260 prefered_lft = max_prefered; 2261 2262 spin_lock(&ift->lock); 2263 flags = ift->flags; 2264 ift->valid_lft = valid_lft; 2265 ift->prefered_lft = prefered_lft; 2266 ift->tstamp = now; 2267 if (prefered_lft > 0) 2268 ift->flags &= ~IFA_F_DEPRECATED; 2269 2270 spin_unlock(&ift->lock); 2271 if (!(flags&IFA_F_TENTATIVE)) 2272 ipv6_ifa_notify(0, ift); 2273 } 2274 2275 if ((create || list_empty(&in6_dev->tempaddr_list)) && in6_dev->cnf.use_tempaddr > 0) { 2276 /* 2277 * When a new public address is created as 2278 * described in [ADDRCONF], also create a new 2279 * temporary address. Also create a temporary 2280 * address if it's enabled but no temporary 2281 * address currently exists. 2282 */ 2283 read_unlock_bh(&in6_dev->lock); 2284 ipv6_create_tempaddr(ifp, NULL); 2285 } else { 2286 read_unlock_bh(&in6_dev->lock); 2287 } 2288 2289 in6_ifa_put(ifp); 2290 addrconf_verify(0); 2291 } 2292 } 2293 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo); 2294 in6_dev_put(in6_dev); 2295 } 2296 2297 /* 2298 * Set destination address. 2299 * Special case for SIT interfaces where we create a new "virtual" 2300 * device. 2301 */ 2302 int addrconf_set_dstaddr(struct net *net, void __user *arg) 2303 { 2304 struct in6_ifreq ireq; 2305 struct net_device *dev; 2306 int err = -EINVAL; 2307 2308 rtnl_lock(); 2309 2310 err = -EFAULT; 2311 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2312 goto err_exit; 2313 2314 dev = __dev_get_by_index(net, ireq.ifr6_ifindex); 2315 2316 err = -ENODEV; 2317 if (dev == NULL) 2318 goto err_exit; 2319 2320 #if IS_ENABLED(CONFIG_IPV6_SIT) 2321 if (dev->type == ARPHRD_SIT) { 2322 const struct net_device_ops *ops = dev->netdev_ops; 2323 struct ifreq ifr; 2324 struct ip_tunnel_parm p; 2325 2326 err = -EADDRNOTAVAIL; 2327 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4)) 2328 goto err_exit; 2329 2330 memset(&p, 0, sizeof(p)); 2331 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3]; 2332 p.iph.saddr = 0; 2333 p.iph.version = 4; 2334 p.iph.ihl = 5; 2335 p.iph.protocol = IPPROTO_IPV6; 2336 p.iph.ttl = 64; 2337 ifr.ifr_ifru.ifru_data = (__force void __user *)&p; 2338 2339 if (ops->ndo_do_ioctl) { 2340 mm_segment_t oldfs = get_fs(); 2341 2342 set_fs(KERNEL_DS); 2343 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL); 2344 set_fs(oldfs); 2345 } else 2346 err = -EOPNOTSUPP; 2347 2348 if (err == 0) { 2349 err = -ENOBUFS; 2350 dev = __dev_get_by_name(net, p.name); 2351 if (!dev) 2352 goto err_exit; 2353 err = dev_open(dev); 2354 } 2355 } 2356 #endif 2357 2358 err_exit: 2359 rtnl_unlock(); 2360 return err; 2361 } 2362 2363 /* 2364 * Manual configuration of address on an interface 2365 */ 2366 static int inet6_addr_add(struct net *net, int ifindex, const struct in6_addr *pfx, 2367 const struct in6_addr *peer_pfx, 2368 unsigned int plen, __u8 ifa_flags, __u32 prefered_lft, 2369 __u32 valid_lft) 2370 { 2371 struct inet6_ifaddr *ifp; 2372 struct inet6_dev *idev; 2373 struct net_device *dev; 2374 int scope; 2375 u32 flags; 2376 clock_t expires; 2377 unsigned long timeout; 2378 2379 ASSERT_RTNL(); 2380 2381 if (plen > 128) 2382 return -EINVAL; 2383 2384 /* check the lifetime */ 2385 if (!valid_lft || prefered_lft > valid_lft) 2386 return -EINVAL; 2387 2388 dev = __dev_get_by_index(net, ifindex); 2389 if (!dev) 2390 return -ENODEV; 2391 2392 idev = addrconf_add_dev(dev); 2393 if (IS_ERR(idev)) 2394 return PTR_ERR(idev); 2395 2396 scope = ipv6_addr_scope(pfx); 2397 2398 timeout = addrconf_timeout_fixup(valid_lft, HZ); 2399 if (addrconf_finite_timeout(timeout)) { 2400 expires = jiffies_to_clock_t(timeout * HZ); 2401 valid_lft = timeout; 2402 flags = RTF_EXPIRES; 2403 } else { 2404 expires = 0; 2405 flags = 0; 2406 ifa_flags |= IFA_F_PERMANENT; 2407 } 2408 2409 timeout = addrconf_timeout_fixup(prefered_lft, HZ); 2410 if (addrconf_finite_timeout(timeout)) { 2411 if (timeout == 0) 2412 ifa_flags |= IFA_F_DEPRECATED; 2413 prefered_lft = timeout; 2414 } 2415 2416 ifp = ipv6_add_addr(idev, pfx, peer_pfx, plen, scope, ifa_flags, 2417 valid_lft, prefered_lft); 2418 2419 if (!IS_ERR(ifp)) { 2420 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev, 2421 expires, flags); 2422 /* 2423 * Note that section 3.1 of RFC 4429 indicates 2424 * that the Optimistic flag should not be set for 2425 * manually configured addresses 2426 */ 2427 addrconf_dad_start(ifp); 2428 in6_ifa_put(ifp); 2429 addrconf_verify(0); 2430 return 0; 2431 } 2432 2433 return PTR_ERR(ifp); 2434 } 2435 2436 static int inet6_addr_del(struct net *net, int ifindex, const struct in6_addr *pfx, 2437 unsigned int plen) 2438 { 2439 struct inet6_ifaddr *ifp; 2440 struct inet6_dev *idev; 2441 struct net_device *dev; 2442 2443 if (plen > 128) 2444 return -EINVAL; 2445 2446 dev = __dev_get_by_index(net, ifindex); 2447 if (!dev) 2448 return -ENODEV; 2449 2450 if ((idev = __in6_dev_get(dev)) == NULL) 2451 return -ENXIO; 2452 2453 read_lock_bh(&idev->lock); 2454 list_for_each_entry(ifp, &idev->addr_list, if_list) { 2455 if (ifp->prefix_len == plen && 2456 ipv6_addr_equal(pfx, &ifp->addr)) { 2457 in6_ifa_hold(ifp); 2458 read_unlock_bh(&idev->lock); 2459 2460 ipv6_del_addr(ifp); 2461 return 0; 2462 } 2463 } 2464 read_unlock_bh(&idev->lock); 2465 return -EADDRNOTAVAIL; 2466 } 2467 2468 2469 int addrconf_add_ifaddr(struct net *net, void __user *arg) 2470 { 2471 struct in6_ifreq ireq; 2472 int err; 2473 2474 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 2475 return -EPERM; 2476 2477 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2478 return -EFAULT; 2479 2480 rtnl_lock(); 2481 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, NULL, 2482 ireq.ifr6_prefixlen, IFA_F_PERMANENT, 2483 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME); 2484 rtnl_unlock(); 2485 return err; 2486 } 2487 2488 int addrconf_del_ifaddr(struct net *net, void __user *arg) 2489 { 2490 struct in6_ifreq ireq; 2491 int err; 2492 2493 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 2494 return -EPERM; 2495 2496 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2497 return -EFAULT; 2498 2499 rtnl_lock(); 2500 err = inet6_addr_del(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, 2501 ireq.ifr6_prefixlen); 2502 rtnl_unlock(); 2503 return err; 2504 } 2505 2506 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr, 2507 int plen, int scope) 2508 { 2509 struct inet6_ifaddr *ifp; 2510 2511 ifp = ipv6_add_addr(idev, addr, NULL, plen, 2512 scope, IFA_F_PERMANENT, 0, 0); 2513 if (!IS_ERR(ifp)) { 2514 spin_lock_bh(&ifp->lock); 2515 ifp->flags &= ~IFA_F_TENTATIVE; 2516 spin_unlock_bh(&ifp->lock); 2517 ipv6_ifa_notify(RTM_NEWADDR, ifp); 2518 in6_ifa_put(ifp); 2519 } 2520 } 2521 2522 #if IS_ENABLED(CONFIG_IPV6_SIT) 2523 static void sit_add_v4_addrs(struct inet6_dev *idev) 2524 { 2525 struct in6_addr addr; 2526 struct net_device *dev; 2527 struct net *net = dev_net(idev->dev); 2528 int scope, plen; 2529 u32 pflags = 0; 2530 2531 ASSERT_RTNL(); 2532 2533 memset(&addr, 0, sizeof(struct in6_addr)); 2534 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4); 2535 2536 if (idev->dev->flags&IFF_POINTOPOINT) { 2537 addr.s6_addr32[0] = htonl(0xfe800000); 2538 scope = IFA_LINK; 2539 plen = 64; 2540 } else { 2541 scope = IPV6_ADDR_COMPATv4; 2542 plen = 96; 2543 pflags |= RTF_NONEXTHOP; 2544 } 2545 2546 if (addr.s6_addr32[3]) { 2547 add_addr(idev, &addr, plen, scope); 2548 addrconf_prefix_route(&addr, plen, idev->dev, 0, pflags); 2549 return; 2550 } 2551 2552 for_each_netdev(net, dev) { 2553 struct in_device *in_dev = __in_dev_get_rtnl(dev); 2554 if (in_dev && (dev->flags & IFF_UP)) { 2555 struct in_ifaddr *ifa; 2556 2557 int flag = scope; 2558 2559 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) { 2560 2561 addr.s6_addr32[3] = ifa->ifa_local; 2562 2563 if (ifa->ifa_scope == RT_SCOPE_LINK) 2564 continue; 2565 if (ifa->ifa_scope >= RT_SCOPE_HOST) { 2566 if (idev->dev->flags&IFF_POINTOPOINT) 2567 continue; 2568 flag |= IFA_HOST; 2569 } 2570 2571 add_addr(idev, &addr, plen, flag); 2572 addrconf_prefix_route(&addr, plen, idev->dev, 0, 2573 pflags); 2574 } 2575 } 2576 } 2577 } 2578 #endif 2579 2580 static void init_loopback(struct net_device *dev) 2581 { 2582 struct inet6_dev *idev; 2583 struct net_device *sp_dev; 2584 struct inet6_ifaddr *sp_ifa; 2585 struct rt6_info *sp_rt; 2586 2587 /* ::1 */ 2588 2589 ASSERT_RTNL(); 2590 2591 if ((idev = ipv6_find_idev(dev)) == NULL) { 2592 pr_debug("%s: add_dev failed\n", __func__); 2593 return; 2594 } 2595 2596 add_addr(idev, &in6addr_loopback, 128, IFA_HOST); 2597 2598 /* Add routes to other interface's IPv6 addresses */ 2599 for_each_netdev(dev_net(dev), sp_dev) { 2600 if (!strcmp(sp_dev->name, dev->name)) 2601 continue; 2602 2603 idev = __in6_dev_get(sp_dev); 2604 if (!idev) 2605 continue; 2606 2607 read_lock_bh(&idev->lock); 2608 list_for_each_entry(sp_ifa, &idev->addr_list, if_list) { 2609 2610 if (sp_ifa->flags & (IFA_F_DADFAILED | IFA_F_TENTATIVE)) 2611 continue; 2612 2613 if (sp_ifa->rt) 2614 continue; 2615 2616 sp_rt = addrconf_dst_alloc(idev, &sp_ifa->addr, 0); 2617 2618 /* Failure cases are ignored */ 2619 if (!IS_ERR(sp_rt)) { 2620 sp_ifa->rt = sp_rt; 2621 ip6_ins_rt(sp_rt); 2622 } 2623 } 2624 read_unlock_bh(&idev->lock); 2625 } 2626 } 2627 2628 static void addrconf_add_linklocal(struct inet6_dev *idev, const struct in6_addr *addr) 2629 { 2630 struct inet6_ifaddr *ifp; 2631 u32 addr_flags = IFA_F_PERMANENT; 2632 2633 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 2634 if (idev->cnf.optimistic_dad && 2635 !dev_net(idev->dev)->ipv6.devconf_all->forwarding) 2636 addr_flags |= IFA_F_OPTIMISTIC; 2637 #endif 2638 2639 2640 ifp = ipv6_add_addr(idev, addr, NULL, 64, IFA_LINK, addr_flags, 0, 0); 2641 if (!IS_ERR(ifp)) { 2642 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0); 2643 addrconf_dad_start(ifp); 2644 in6_ifa_put(ifp); 2645 } 2646 } 2647 2648 static void addrconf_dev_config(struct net_device *dev) 2649 { 2650 struct in6_addr addr; 2651 struct inet6_dev *idev; 2652 2653 ASSERT_RTNL(); 2654 2655 if ((dev->type != ARPHRD_ETHER) && 2656 (dev->type != ARPHRD_FDDI) && 2657 (dev->type != ARPHRD_ARCNET) && 2658 (dev->type != ARPHRD_INFINIBAND) && 2659 (dev->type != ARPHRD_IEEE802154) && 2660 (dev->type != ARPHRD_IEEE1394) && 2661 (dev->type != ARPHRD_TUNNEL6)) { 2662 /* Alas, we support only Ethernet autoconfiguration. */ 2663 return; 2664 } 2665 2666 idev = addrconf_add_dev(dev); 2667 if (IS_ERR(idev)) 2668 return; 2669 2670 memset(&addr, 0, sizeof(struct in6_addr)); 2671 addr.s6_addr32[0] = htonl(0xFE800000); 2672 2673 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0) 2674 addrconf_add_linklocal(idev, &addr); 2675 } 2676 2677 #if IS_ENABLED(CONFIG_IPV6_SIT) 2678 static void addrconf_sit_config(struct net_device *dev) 2679 { 2680 struct inet6_dev *idev; 2681 2682 ASSERT_RTNL(); 2683 2684 /* 2685 * Configure the tunnel with one of our IPv4 2686 * addresses... we should configure all of 2687 * our v4 addrs in the tunnel 2688 */ 2689 2690 if ((idev = ipv6_find_idev(dev)) == NULL) { 2691 pr_debug("%s: add_dev failed\n", __func__); 2692 return; 2693 } 2694 2695 if (dev->priv_flags & IFF_ISATAP) { 2696 struct in6_addr addr; 2697 2698 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0); 2699 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev)) 2700 addrconf_add_linklocal(idev, &addr); 2701 return; 2702 } 2703 2704 sit_add_v4_addrs(idev); 2705 2706 if (dev->flags&IFF_POINTOPOINT) 2707 addrconf_add_mroute(dev); 2708 } 2709 #endif 2710 2711 #if IS_ENABLED(CONFIG_NET_IPGRE) 2712 static void addrconf_gre_config(struct net_device *dev) 2713 { 2714 struct inet6_dev *idev; 2715 struct in6_addr addr; 2716 2717 ASSERT_RTNL(); 2718 2719 if ((idev = ipv6_find_idev(dev)) == NULL) { 2720 pr_debug("%s: add_dev failed\n", __func__); 2721 return; 2722 } 2723 2724 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0); 2725 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev)) 2726 addrconf_add_linklocal(idev, &addr); 2727 } 2728 #endif 2729 2730 static inline int 2731 ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev) 2732 { 2733 struct in6_addr lladdr; 2734 2735 if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) { 2736 addrconf_add_linklocal(idev, &lladdr); 2737 return 0; 2738 } 2739 return -1; 2740 } 2741 2742 static int addrconf_notify(struct notifier_block *this, unsigned long event, 2743 void *ptr) 2744 { 2745 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 2746 struct inet6_dev *idev = __in6_dev_get(dev); 2747 int run_pending = 0; 2748 int err; 2749 2750 switch (event) { 2751 case NETDEV_REGISTER: 2752 if (!idev && dev->mtu >= IPV6_MIN_MTU) { 2753 idev = ipv6_add_dev(dev); 2754 if (!idev) 2755 return notifier_from_errno(-ENOMEM); 2756 } 2757 break; 2758 2759 case NETDEV_UP: 2760 case NETDEV_CHANGE: 2761 if (dev->flags & IFF_SLAVE) 2762 break; 2763 2764 if (event == NETDEV_UP) { 2765 if (!addrconf_qdisc_ok(dev)) { 2766 /* device is not ready yet. */ 2767 pr_info("ADDRCONF(NETDEV_UP): %s: link is not ready\n", 2768 dev->name); 2769 break; 2770 } 2771 2772 if (!idev && dev->mtu >= IPV6_MIN_MTU) 2773 idev = ipv6_add_dev(dev); 2774 2775 if (idev) { 2776 idev->if_flags |= IF_READY; 2777 run_pending = 1; 2778 } 2779 } else { 2780 if (!addrconf_qdisc_ok(dev)) { 2781 /* device is still not ready. */ 2782 break; 2783 } 2784 2785 if (idev) { 2786 if (idev->if_flags & IF_READY) 2787 /* device is already configured. */ 2788 break; 2789 idev->if_flags |= IF_READY; 2790 } 2791 2792 pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n", 2793 dev->name); 2794 2795 run_pending = 1; 2796 } 2797 2798 switch (dev->type) { 2799 #if IS_ENABLED(CONFIG_IPV6_SIT) 2800 case ARPHRD_SIT: 2801 addrconf_sit_config(dev); 2802 break; 2803 #endif 2804 #if IS_ENABLED(CONFIG_NET_IPGRE) 2805 case ARPHRD_IPGRE: 2806 addrconf_gre_config(dev); 2807 break; 2808 #endif 2809 case ARPHRD_LOOPBACK: 2810 init_loopback(dev); 2811 break; 2812 2813 default: 2814 addrconf_dev_config(dev); 2815 break; 2816 } 2817 2818 if (idev) { 2819 if (run_pending) 2820 addrconf_dad_run(idev); 2821 2822 /* 2823 * If the MTU changed during the interface down, 2824 * when the interface up, the changed MTU must be 2825 * reflected in the idev as well as routers. 2826 */ 2827 if (idev->cnf.mtu6 != dev->mtu && 2828 dev->mtu >= IPV6_MIN_MTU) { 2829 rt6_mtu_change(dev, dev->mtu); 2830 idev->cnf.mtu6 = dev->mtu; 2831 } 2832 idev->tstamp = jiffies; 2833 inet6_ifinfo_notify(RTM_NEWLINK, idev); 2834 2835 /* 2836 * If the changed mtu during down is lower than 2837 * IPV6_MIN_MTU stop IPv6 on this interface. 2838 */ 2839 if (dev->mtu < IPV6_MIN_MTU) 2840 addrconf_ifdown(dev, 1); 2841 } 2842 break; 2843 2844 case NETDEV_CHANGEMTU: 2845 if (idev && dev->mtu >= IPV6_MIN_MTU) { 2846 rt6_mtu_change(dev, dev->mtu); 2847 idev->cnf.mtu6 = dev->mtu; 2848 break; 2849 } 2850 2851 if (!idev && dev->mtu >= IPV6_MIN_MTU) { 2852 idev = ipv6_add_dev(dev); 2853 if (idev) 2854 break; 2855 } 2856 2857 /* 2858 * MTU falled under IPV6_MIN_MTU. 2859 * Stop IPv6 on this interface. 2860 */ 2861 2862 case NETDEV_DOWN: 2863 case NETDEV_UNREGISTER: 2864 /* 2865 * Remove all addresses from this interface. 2866 */ 2867 addrconf_ifdown(dev, event != NETDEV_DOWN); 2868 break; 2869 2870 case NETDEV_CHANGENAME: 2871 if (idev) { 2872 snmp6_unregister_dev(idev); 2873 addrconf_sysctl_unregister(idev); 2874 addrconf_sysctl_register(idev); 2875 err = snmp6_register_dev(idev); 2876 if (err) 2877 return notifier_from_errno(err); 2878 } 2879 break; 2880 2881 case NETDEV_PRE_TYPE_CHANGE: 2882 case NETDEV_POST_TYPE_CHANGE: 2883 addrconf_type_change(dev, event); 2884 break; 2885 } 2886 2887 return NOTIFY_OK; 2888 } 2889 2890 /* 2891 * addrconf module should be notified of a device going up 2892 */ 2893 static struct notifier_block ipv6_dev_notf = { 2894 .notifier_call = addrconf_notify, 2895 }; 2896 2897 static void addrconf_type_change(struct net_device *dev, unsigned long event) 2898 { 2899 struct inet6_dev *idev; 2900 ASSERT_RTNL(); 2901 2902 idev = __in6_dev_get(dev); 2903 2904 if (event == NETDEV_POST_TYPE_CHANGE) 2905 ipv6_mc_remap(idev); 2906 else if (event == NETDEV_PRE_TYPE_CHANGE) 2907 ipv6_mc_unmap(idev); 2908 } 2909 2910 static int addrconf_ifdown(struct net_device *dev, int how) 2911 { 2912 struct net *net = dev_net(dev); 2913 struct inet6_dev *idev; 2914 struct inet6_ifaddr *ifa; 2915 int state, i; 2916 2917 ASSERT_RTNL(); 2918 2919 rt6_ifdown(net, dev); 2920 neigh_ifdown(&nd_tbl, dev); 2921 2922 idev = __in6_dev_get(dev); 2923 if (idev == NULL) 2924 return -ENODEV; 2925 2926 /* 2927 * Step 1: remove reference to ipv6 device from parent device. 2928 * Do not dev_put! 2929 */ 2930 if (how) { 2931 idev->dead = 1; 2932 2933 /* protected by rtnl_lock */ 2934 RCU_INIT_POINTER(dev->ip6_ptr, NULL); 2935 2936 /* Step 1.5: remove snmp6 entry */ 2937 snmp6_unregister_dev(idev); 2938 2939 } 2940 2941 /* Step 2: clear hash table */ 2942 for (i = 0; i < IN6_ADDR_HSIZE; i++) { 2943 struct hlist_head *h = &inet6_addr_lst[i]; 2944 2945 spin_lock_bh(&addrconf_hash_lock); 2946 restart: 2947 hlist_for_each_entry_rcu(ifa, h, addr_lst) { 2948 if (ifa->idev == idev) { 2949 hlist_del_init_rcu(&ifa->addr_lst); 2950 addrconf_del_dad_timer(ifa); 2951 goto restart; 2952 } 2953 } 2954 spin_unlock_bh(&addrconf_hash_lock); 2955 } 2956 2957 write_lock_bh(&idev->lock); 2958 2959 addrconf_del_rs_timer(idev); 2960 2961 /* Step 2: clear flags for stateless addrconf */ 2962 if (!how) 2963 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY); 2964 2965 if (how && del_timer(&idev->regen_timer)) 2966 in6_dev_put(idev); 2967 2968 /* Step 3: clear tempaddr list */ 2969 while (!list_empty(&idev->tempaddr_list)) { 2970 ifa = list_first_entry(&idev->tempaddr_list, 2971 struct inet6_ifaddr, tmp_list); 2972 list_del(&ifa->tmp_list); 2973 write_unlock_bh(&idev->lock); 2974 spin_lock_bh(&ifa->lock); 2975 2976 if (ifa->ifpub) { 2977 in6_ifa_put(ifa->ifpub); 2978 ifa->ifpub = NULL; 2979 } 2980 spin_unlock_bh(&ifa->lock); 2981 in6_ifa_put(ifa); 2982 write_lock_bh(&idev->lock); 2983 } 2984 2985 while (!list_empty(&idev->addr_list)) { 2986 ifa = list_first_entry(&idev->addr_list, 2987 struct inet6_ifaddr, if_list); 2988 addrconf_del_dad_timer(ifa); 2989 2990 list_del(&ifa->if_list); 2991 2992 write_unlock_bh(&idev->lock); 2993 2994 spin_lock_bh(&ifa->state_lock); 2995 state = ifa->state; 2996 ifa->state = INET6_IFADDR_STATE_DEAD; 2997 spin_unlock_bh(&ifa->state_lock); 2998 2999 if (state != INET6_IFADDR_STATE_DEAD) { 3000 __ipv6_ifa_notify(RTM_DELADDR, ifa); 3001 inet6addr_notifier_call_chain(NETDEV_DOWN, ifa); 3002 } 3003 in6_ifa_put(ifa); 3004 3005 write_lock_bh(&idev->lock); 3006 } 3007 3008 write_unlock_bh(&idev->lock); 3009 3010 /* Step 5: Discard multicast list */ 3011 if (how) 3012 ipv6_mc_destroy_dev(idev); 3013 else 3014 ipv6_mc_down(idev); 3015 3016 idev->tstamp = jiffies; 3017 3018 /* Last: Shot the device (if unregistered) */ 3019 if (how) { 3020 addrconf_sysctl_unregister(idev); 3021 neigh_parms_release(&nd_tbl, idev->nd_parms); 3022 neigh_ifdown(&nd_tbl, dev); 3023 in6_dev_put(idev); 3024 } 3025 return 0; 3026 } 3027 3028 static void addrconf_rs_timer(unsigned long data) 3029 { 3030 struct inet6_dev *idev = (struct inet6_dev *)data; 3031 struct net_device *dev = idev->dev; 3032 struct in6_addr lladdr; 3033 3034 write_lock(&idev->lock); 3035 if (idev->dead || !(idev->if_flags & IF_READY)) 3036 goto out; 3037 3038 if (!ipv6_accept_ra(idev)) 3039 goto out; 3040 3041 /* Announcement received after solicitation was sent */ 3042 if (idev->if_flags & IF_RA_RCVD) 3043 goto out; 3044 3045 if (idev->rs_probes++ < idev->cnf.rtr_solicits) { 3046 write_unlock(&idev->lock); 3047 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE)) 3048 ndisc_send_rs(dev, &lladdr, 3049 &in6addr_linklocal_allrouters); 3050 else 3051 goto put; 3052 3053 write_lock(&idev->lock); 3054 /* The wait after the last probe can be shorter */ 3055 addrconf_mod_rs_timer(idev, (idev->rs_probes == 3056 idev->cnf.rtr_solicits) ? 3057 idev->cnf.rtr_solicit_delay : 3058 idev->cnf.rtr_solicit_interval); 3059 } else { 3060 /* 3061 * Note: we do not support deprecated "all on-link" 3062 * assumption any longer. 3063 */ 3064 pr_debug("%s: no IPv6 routers present\n", idev->dev->name); 3065 } 3066 3067 out: 3068 write_unlock(&idev->lock); 3069 put: 3070 in6_dev_put(idev); 3071 } 3072 3073 /* 3074 * Duplicate Address Detection 3075 */ 3076 static void addrconf_dad_kick(struct inet6_ifaddr *ifp) 3077 { 3078 unsigned long rand_num; 3079 struct inet6_dev *idev = ifp->idev; 3080 3081 if (ifp->flags & IFA_F_OPTIMISTIC) 3082 rand_num = 0; 3083 else 3084 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1); 3085 3086 ifp->dad_probes = idev->cnf.dad_transmits; 3087 addrconf_mod_dad_timer(ifp, rand_num); 3088 } 3089 3090 static void addrconf_dad_start(struct inet6_ifaddr *ifp) 3091 { 3092 struct inet6_dev *idev = ifp->idev; 3093 struct net_device *dev = idev->dev; 3094 3095 addrconf_join_solict(dev, &ifp->addr); 3096 3097 net_srandom(ifp->addr.s6_addr32[3]); 3098 3099 read_lock_bh(&idev->lock); 3100 spin_lock(&ifp->lock); 3101 if (ifp->state == INET6_IFADDR_STATE_DEAD) 3102 goto out; 3103 3104 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) || 3105 idev->cnf.accept_dad < 1 || 3106 !(ifp->flags&IFA_F_TENTATIVE) || 3107 ifp->flags & IFA_F_NODAD) { 3108 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED); 3109 spin_unlock(&ifp->lock); 3110 read_unlock_bh(&idev->lock); 3111 3112 addrconf_dad_completed(ifp); 3113 return; 3114 } 3115 3116 if (!(idev->if_flags & IF_READY)) { 3117 spin_unlock(&ifp->lock); 3118 read_unlock_bh(&idev->lock); 3119 /* 3120 * If the device is not ready: 3121 * - keep it tentative if it is a permanent address. 3122 * - otherwise, kill it. 3123 */ 3124 in6_ifa_hold(ifp); 3125 addrconf_dad_stop(ifp, 0); 3126 return; 3127 } 3128 3129 /* 3130 * Optimistic nodes can start receiving 3131 * Frames right away 3132 */ 3133 if (ifp->flags & IFA_F_OPTIMISTIC) 3134 ip6_ins_rt(ifp->rt); 3135 3136 addrconf_dad_kick(ifp); 3137 out: 3138 spin_unlock(&ifp->lock); 3139 read_unlock_bh(&idev->lock); 3140 } 3141 3142 static void addrconf_dad_timer(unsigned long data) 3143 { 3144 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data; 3145 struct inet6_dev *idev = ifp->idev; 3146 struct in6_addr mcaddr; 3147 3148 if (!ifp->dad_probes && addrconf_dad_end(ifp)) 3149 goto out; 3150 3151 write_lock(&idev->lock); 3152 if (idev->dead || !(idev->if_flags & IF_READY)) { 3153 write_unlock(&idev->lock); 3154 goto out; 3155 } 3156 3157 spin_lock(&ifp->lock); 3158 if (ifp->state == INET6_IFADDR_STATE_DEAD) { 3159 spin_unlock(&ifp->lock); 3160 write_unlock(&idev->lock); 3161 goto out; 3162 } 3163 3164 if (ifp->dad_probes == 0) { 3165 /* 3166 * DAD was successful 3167 */ 3168 3169 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED); 3170 spin_unlock(&ifp->lock); 3171 write_unlock(&idev->lock); 3172 3173 addrconf_dad_completed(ifp); 3174 3175 goto out; 3176 } 3177 3178 ifp->dad_probes--; 3179 addrconf_mod_dad_timer(ifp, ifp->idev->nd_parms->retrans_time); 3180 spin_unlock(&ifp->lock); 3181 write_unlock(&idev->lock); 3182 3183 /* send a neighbour solicitation for our addr */ 3184 addrconf_addr_solict_mult(&ifp->addr, &mcaddr); 3185 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &in6addr_any); 3186 out: 3187 in6_ifa_put(ifp); 3188 } 3189 3190 static void addrconf_dad_completed(struct inet6_ifaddr *ifp) 3191 { 3192 struct net_device *dev = ifp->idev->dev; 3193 struct in6_addr lladdr; 3194 bool send_rs, send_mld; 3195 3196 addrconf_del_dad_timer(ifp); 3197 3198 /* 3199 * Configure the address for reception. Now it is valid. 3200 */ 3201 3202 ipv6_ifa_notify(RTM_NEWADDR, ifp); 3203 3204 /* If added prefix is link local and we are prepared to process 3205 router advertisements, start sending router solicitations. 3206 */ 3207 3208 read_lock_bh(&ifp->idev->lock); 3209 spin_lock(&ifp->lock); 3210 send_mld = ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL && 3211 ifp->idev->valid_ll_addr_cnt == 1; 3212 send_rs = send_mld && 3213 ipv6_accept_ra(ifp->idev) && 3214 ifp->idev->cnf.rtr_solicits > 0 && 3215 (dev->flags&IFF_LOOPBACK) == 0; 3216 spin_unlock(&ifp->lock); 3217 read_unlock_bh(&ifp->idev->lock); 3218 3219 /* While dad is in progress mld report's source address is in6_addrany. 3220 * Resend with proper ll now. 3221 */ 3222 if (send_mld) 3223 ipv6_mc_dad_complete(ifp->idev); 3224 3225 if (send_rs) { 3226 /* 3227 * If a host as already performed a random delay 3228 * [...] as part of DAD [...] there is no need 3229 * to delay again before sending the first RS 3230 */ 3231 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE)) 3232 return; 3233 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters); 3234 3235 write_lock_bh(&ifp->idev->lock); 3236 spin_lock(&ifp->lock); 3237 ifp->idev->rs_probes = 1; 3238 ifp->idev->if_flags |= IF_RS_SENT; 3239 addrconf_mod_rs_timer(ifp->idev, 3240 ifp->idev->cnf.rtr_solicit_interval); 3241 spin_unlock(&ifp->lock); 3242 write_unlock_bh(&ifp->idev->lock); 3243 } 3244 } 3245 3246 static void addrconf_dad_run(struct inet6_dev *idev) 3247 { 3248 struct inet6_ifaddr *ifp; 3249 3250 read_lock_bh(&idev->lock); 3251 list_for_each_entry(ifp, &idev->addr_list, if_list) { 3252 spin_lock(&ifp->lock); 3253 if (ifp->flags & IFA_F_TENTATIVE && 3254 ifp->state == INET6_IFADDR_STATE_DAD) 3255 addrconf_dad_kick(ifp); 3256 spin_unlock(&ifp->lock); 3257 } 3258 read_unlock_bh(&idev->lock); 3259 } 3260 3261 #ifdef CONFIG_PROC_FS 3262 struct if6_iter_state { 3263 struct seq_net_private p; 3264 int bucket; 3265 int offset; 3266 }; 3267 3268 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos) 3269 { 3270 struct inet6_ifaddr *ifa = NULL; 3271 struct if6_iter_state *state = seq->private; 3272 struct net *net = seq_file_net(seq); 3273 int p = 0; 3274 3275 /* initial bucket if pos is 0 */ 3276 if (pos == 0) { 3277 state->bucket = 0; 3278 state->offset = 0; 3279 } 3280 3281 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) { 3282 hlist_for_each_entry_rcu_bh(ifa, &inet6_addr_lst[state->bucket], 3283 addr_lst) { 3284 if (!net_eq(dev_net(ifa->idev->dev), net)) 3285 continue; 3286 /* sync with offset */ 3287 if (p < state->offset) { 3288 p++; 3289 continue; 3290 } 3291 state->offset++; 3292 return ifa; 3293 } 3294 3295 /* prepare for next bucket */ 3296 state->offset = 0; 3297 p = 0; 3298 } 3299 return NULL; 3300 } 3301 3302 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, 3303 struct inet6_ifaddr *ifa) 3304 { 3305 struct if6_iter_state *state = seq->private; 3306 struct net *net = seq_file_net(seq); 3307 3308 hlist_for_each_entry_continue_rcu_bh(ifa, addr_lst) { 3309 if (!net_eq(dev_net(ifa->idev->dev), net)) 3310 continue; 3311 state->offset++; 3312 return ifa; 3313 } 3314 3315 while (++state->bucket < IN6_ADDR_HSIZE) { 3316 state->offset = 0; 3317 hlist_for_each_entry_rcu_bh(ifa, 3318 &inet6_addr_lst[state->bucket], addr_lst) { 3319 if (!net_eq(dev_net(ifa->idev->dev), net)) 3320 continue; 3321 state->offset++; 3322 return ifa; 3323 } 3324 } 3325 3326 return NULL; 3327 } 3328 3329 static void *if6_seq_start(struct seq_file *seq, loff_t *pos) 3330 __acquires(rcu_bh) 3331 { 3332 rcu_read_lock_bh(); 3333 return if6_get_first(seq, *pos); 3334 } 3335 3336 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos) 3337 { 3338 struct inet6_ifaddr *ifa; 3339 3340 ifa = if6_get_next(seq, v); 3341 ++*pos; 3342 return ifa; 3343 } 3344 3345 static void if6_seq_stop(struct seq_file *seq, void *v) 3346 __releases(rcu_bh) 3347 { 3348 rcu_read_unlock_bh(); 3349 } 3350 3351 static int if6_seq_show(struct seq_file *seq, void *v) 3352 { 3353 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v; 3354 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n", 3355 &ifp->addr, 3356 ifp->idev->dev->ifindex, 3357 ifp->prefix_len, 3358 ifp->scope, 3359 ifp->flags, 3360 ifp->idev->dev->name); 3361 return 0; 3362 } 3363 3364 static const struct seq_operations if6_seq_ops = { 3365 .start = if6_seq_start, 3366 .next = if6_seq_next, 3367 .show = if6_seq_show, 3368 .stop = if6_seq_stop, 3369 }; 3370 3371 static int if6_seq_open(struct inode *inode, struct file *file) 3372 { 3373 return seq_open_net(inode, file, &if6_seq_ops, 3374 sizeof(struct if6_iter_state)); 3375 } 3376 3377 static const struct file_operations if6_fops = { 3378 .owner = THIS_MODULE, 3379 .open = if6_seq_open, 3380 .read = seq_read, 3381 .llseek = seq_lseek, 3382 .release = seq_release_net, 3383 }; 3384 3385 static int __net_init if6_proc_net_init(struct net *net) 3386 { 3387 if (!proc_create("if_inet6", S_IRUGO, net->proc_net, &if6_fops)) 3388 return -ENOMEM; 3389 return 0; 3390 } 3391 3392 static void __net_exit if6_proc_net_exit(struct net *net) 3393 { 3394 remove_proc_entry("if_inet6", net->proc_net); 3395 } 3396 3397 static struct pernet_operations if6_proc_net_ops = { 3398 .init = if6_proc_net_init, 3399 .exit = if6_proc_net_exit, 3400 }; 3401 3402 int __init if6_proc_init(void) 3403 { 3404 return register_pernet_subsys(&if6_proc_net_ops); 3405 } 3406 3407 void if6_proc_exit(void) 3408 { 3409 unregister_pernet_subsys(&if6_proc_net_ops); 3410 } 3411 #endif /* CONFIG_PROC_FS */ 3412 3413 #if IS_ENABLED(CONFIG_IPV6_MIP6) 3414 /* Check if address is a home address configured on any interface. */ 3415 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr) 3416 { 3417 int ret = 0; 3418 struct inet6_ifaddr *ifp = NULL; 3419 unsigned int hash = inet6_addr_hash(addr); 3420 3421 rcu_read_lock_bh(); 3422 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) { 3423 if (!net_eq(dev_net(ifp->idev->dev), net)) 3424 continue; 3425 if (ipv6_addr_equal(&ifp->addr, addr) && 3426 (ifp->flags & IFA_F_HOMEADDRESS)) { 3427 ret = 1; 3428 break; 3429 } 3430 } 3431 rcu_read_unlock_bh(); 3432 return ret; 3433 } 3434 #endif 3435 3436 /* 3437 * Periodic address status verification 3438 */ 3439 3440 static void addrconf_verify(unsigned long foo) 3441 { 3442 unsigned long now, next, next_sec, next_sched; 3443 struct inet6_ifaddr *ifp; 3444 int i; 3445 3446 rcu_read_lock_bh(); 3447 spin_lock(&addrconf_verify_lock); 3448 now = jiffies; 3449 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY); 3450 3451 del_timer(&addr_chk_timer); 3452 3453 for (i = 0; i < IN6_ADDR_HSIZE; i++) { 3454 restart: 3455 hlist_for_each_entry_rcu_bh(ifp, 3456 &inet6_addr_lst[i], addr_lst) { 3457 unsigned long age; 3458 3459 if (ifp->flags & IFA_F_PERMANENT) 3460 continue; 3461 3462 spin_lock(&ifp->lock); 3463 /* We try to batch several events at once. */ 3464 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ; 3465 3466 if (ifp->valid_lft != INFINITY_LIFE_TIME && 3467 age >= ifp->valid_lft) { 3468 spin_unlock(&ifp->lock); 3469 in6_ifa_hold(ifp); 3470 ipv6_del_addr(ifp); 3471 goto restart; 3472 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) { 3473 spin_unlock(&ifp->lock); 3474 continue; 3475 } else if (age >= ifp->prefered_lft) { 3476 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */ 3477 int deprecate = 0; 3478 3479 if (!(ifp->flags&IFA_F_DEPRECATED)) { 3480 deprecate = 1; 3481 ifp->flags |= IFA_F_DEPRECATED; 3482 } 3483 3484 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next)) 3485 next = ifp->tstamp + ifp->valid_lft * HZ; 3486 3487 spin_unlock(&ifp->lock); 3488 3489 if (deprecate) { 3490 in6_ifa_hold(ifp); 3491 3492 ipv6_ifa_notify(0, ifp); 3493 in6_ifa_put(ifp); 3494 goto restart; 3495 } 3496 } else if ((ifp->flags&IFA_F_TEMPORARY) && 3497 !(ifp->flags&IFA_F_TENTATIVE)) { 3498 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry * 3499 ifp->idev->cnf.dad_transmits * 3500 ifp->idev->nd_parms->retrans_time / HZ; 3501 3502 if (age >= ifp->prefered_lft - regen_advance) { 3503 struct inet6_ifaddr *ifpub = ifp->ifpub; 3504 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 3505 next = ifp->tstamp + ifp->prefered_lft * HZ; 3506 if (!ifp->regen_count && ifpub) { 3507 ifp->regen_count++; 3508 in6_ifa_hold(ifp); 3509 in6_ifa_hold(ifpub); 3510 spin_unlock(&ifp->lock); 3511 3512 spin_lock(&ifpub->lock); 3513 ifpub->regen_count = 0; 3514 spin_unlock(&ifpub->lock); 3515 ipv6_create_tempaddr(ifpub, ifp); 3516 in6_ifa_put(ifpub); 3517 in6_ifa_put(ifp); 3518 goto restart; 3519 } 3520 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next)) 3521 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ; 3522 spin_unlock(&ifp->lock); 3523 } else { 3524 /* ifp->prefered_lft <= ifp->valid_lft */ 3525 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 3526 next = ifp->tstamp + ifp->prefered_lft * HZ; 3527 spin_unlock(&ifp->lock); 3528 } 3529 } 3530 } 3531 3532 next_sec = round_jiffies_up(next); 3533 next_sched = next; 3534 3535 /* If rounded timeout is accurate enough, accept it. */ 3536 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ)) 3537 next_sched = next_sec; 3538 3539 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */ 3540 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX)) 3541 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX; 3542 3543 ADBG(KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n", 3544 now, next, next_sec, next_sched); 3545 3546 addr_chk_timer.expires = next_sched; 3547 add_timer(&addr_chk_timer); 3548 spin_unlock(&addrconf_verify_lock); 3549 rcu_read_unlock_bh(); 3550 } 3551 3552 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local, 3553 struct in6_addr **peer_pfx) 3554 { 3555 struct in6_addr *pfx = NULL; 3556 3557 *peer_pfx = NULL; 3558 3559 if (addr) 3560 pfx = nla_data(addr); 3561 3562 if (local) { 3563 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx))) 3564 *peer_pfx = pfx; 3565 pfx = nla_data(local); 3566 } 3567 3568 return pfx; 3569 } 3570 3571 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = { 3572 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) }, 3573 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) }, 3574 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) }, 3575 }; 3576 3577 static int 3578 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh) 3579 { 3580 struct net *net = sock_net(skb->sk); 3581 struct ifaddrmsg *ifm; 3582 struct nlattr *tb[IFA_MAX+1]; 3583 struct in6_addr *pfx, *peer_pfx; 3584 int err; 3585 3586 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy); 3587 if (err < 0) 3588 return err; 3589 3590 ifm = nlmsg_data(nlh); 3591 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx); 3592 if (pfx == NULL) 3593 return -EINVAL; 3594 3595 return inet6_addr_del(net, ifm->ifa_index, pfx, ifm->ifa_prefixlen); 3596 } 3597 3598 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags, 3599 u32 prefered_lft, u32 valid_lft) 3600 { 3601 u32 flags; 3602 clock_t expires; 3603 unsigned long timeout; 3604 3605 if (!valid_lft || (prefered_lft > valid_lft)) 3606 return -EINVAL; 3607 3608 timeout = addrconf_timeout_fixup(valid_lft, HZ); 3609 if (addrconf_finite_timeout(timeout)) { 3610 expires = jiffies_to_clock_t(timeout * HZ); 3611 valid_lft = timeout; 3612 flags = RTF_EXPIRES; 3613 } else { 3614 expires = 0; 3615 flags = 0; 3616 ifa_flags |= IFA_F_PERMANENT; 3617 } 3618 3619 timeout = addrconf_timeout_fixup(prefered_lft, HZ); 3620 if (addrconf_finite_timeout(timeout)) { 3621 if (timeout == 0) 3622 ifa_flags |= IFA_F_DEPRECATED; 3623 prefered_lft = timeout; 3624 } 3625 3626 spin_lock_bh(&ifp->lock); 3627 ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags; 3628 ifp->tstamp = jiffies; 3629 ifp->valid_lft = valid_lft; 3630 ifp->prefered_lft = prefered_lft; 3631 3632 spin_unlock_bh(&ifp->lock); 3633 if (!(ifp->flags&IFA_F_TENTATIVE)) 3634 ipv6_ifa_notify(0, ifp); 3635 3636 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev, 3637 expires, flags); 3638 addrconf_verify(0); 3639 3640 return 0; 3641 } 3642 3643 static int 3644 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh) 3645 { 3646 struct net *net = sock_net(skb->sk); 3647 struct ifaddrmsg *ifm; 3648 struct nlattr *tb[IFA_MAX+1]; 3649 struct in6_addr *pfx, *peer_pfx; 3650 struct inet6_ifaddr *ifa; 3651 struct net_device *dev; 3652 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME; 3653 u8 ifa_flags; 3654 int err; 3655 3656 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy); 3657 if (err < 0) 3658 return err; 3659 3660 ifm = nlmsg_data(nlh); 3661 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx); 3662 if (pfx == NULL) 3663 return -EINVAL; 3664 3665 if (tb[IFA_CACHEINFO]) { 3666 struct ifa_cacheinfo *ci; 3667 3668 ci = nla_data(tb[IFA_CACHEINFO]); 3669 valid_lft = ci->ifa_valid; 3670 preferred_lft = ci->ifa_prefered; 3671 } else { 3672 preferred_lft = INFINITY_LIFE_TIME; 3673 valid_lft = INFINITY_LIFE_TIME; 3674 } 3675 3676 dev = __dev_get_by_index(net, ifm->ifa_index); 3677 if (dev == NULL) 3678 return -ENODEV; 3679 3680 /* We ignore other flags so far. */ 3681 ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS); 3682 3683 ifa = ipv6_get_ifaddr(net, pfx, dev, 1); 3684 if (ifa == NULL) { 3685 /* 3686 * It would be best to check for !NLM_F_CREATE here but 3687 * userspace alreay relies on not having to provide this. 3688 */ 3689 return inet6_addr_add(net, ifm->ifa_index, pfx, peer_pfx, 3690 ifm->ifa_prefixlen, ifa_flags, 3691 preferred_lft, valid_lft); 3692 } 3693 3694 if (nlh->nlmsg_flags & NLM_F_EXCL || 3695 !(nlh->nlmsg_flags & NLM_F_REPLACE)) 3696 err = -EEXIST; 3697 else 3698 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft); 3699 3700 in6_ifa_put(ifa); 3701 3702 return err; 3703 } 3704 3705 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags, 3706 u8 scope, int ifindex) 3707 { 3708 struct ifaddrmsg *ifm; 3709 3710 ifm = nlmsg_data(nlh); 3711 ifm->ifa_family = AF_INET6; 3712 ifm->ifa_prefixlen = prefixlen; 3713 ifm->ifa_flags = flags; 3714 ifm->ifa_scope = scope; 3715 ifm->ifa_index = ifindex; 3716 } 3717 3718 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp, 3719 unsigned long tstamp, u32 preferred, u32 valid) 3720 { 3721 struct ifa_cacheinfo ci; 3722 3723 ci.cstamp = cstamp_delta(cstamp); 3724 ci.tstamp = cstamp_delta(tstamp); 3725 ci.ifa_prefered = preferred; 3726 ci.ifa_valid = valid; 3727 3728 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci); 3729 } 3730 3731 static inline int rt_scope(int ifa_scope) 3732 { 3733 if (ifa_scope & IFA_HOST) 3734 return RT_SCOPE_HOST; 3735 else if (ifa_scope & IFA_LINK) 3736 return RT_SCOPE_LINK; 3737 else if (ifa_scope & IFA_SITE) 3738 return RT_SCOPE_SITE; 3739 else 3740 return RT_SCOPE_UNIVERSE; 3741 } 3742 3743 static inline int inet6_ifaddr_msgsize(void) 3744 { 3745 return NLMSG_ALIGN(sizeof(struct ifaddrmsg)) 3746 + nla_total_size(16) /* IFA_LOCAL */ 3747 + nla_total_size(16) /* IFA_ADDRESS */ 3748 + nla_total_size(sizeof(struct ifa_cacheinfo)); 3749 } 3750 3751 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa, 3752 u32 portid, u32 seq, int event, unsigned int flags) 3753 { 3754 struct nlmsghdr *nlh; 3755 u32 preferred, valid; 3756 3757 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags); 3758 if (nlh == NULL) 3759 return -EMSGSIZE; 3760 3761 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope), 3762 ifa->idev->dev->ifindex); 3763 3764 if (!(ifa->flags&IFA_F_PERMANENT)) { 3765 preferred = ifa->prefered_lft; 3766 valid = ifa->valid_lft; 3767 if (preferred != INFINITY_LIFE_TIME) { 3768 long tval = (jiffies - ifa->tstamp)/HZ; 3769 if (preferred > tval) 3770 preferred -= tval; 3771 else 3772 preferred = 0; 3773 if (valid != INFINITY_LIFE_TIME) { 3774 if (valid > tval) 3775 valid -= tval; 3776 else 3777 valid = 0; 3778 } 3779 } 3780 } else { 3781 preferred = INFINITY_LIFE_TIME; 3782 valid = INFINITY_LIFE_TIME; 3783 } 3784 3785 if (!ipv6_addr_any(&ifa->peer_addr)) { 3786 if (nla_put(skb, IFA_LOCAL, 16, &ifa->addr) < 0 || 3787 nla_put(skb, IFA_ADDRESS, 16, &ifa->peer_addr) < 0) 3788 goto error; 3789 } else 3790 if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0) 3791 goto error; 3792 3793 if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) 3794 goto error; 3795 3796 return nlmsg_end(skb, nlh); 3797 3798 error: 3799 nlmsg_cancel(skb, nlh); 3800 return -EMSGSIZE; 3801 } 3802 3803 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca, 3804 u32 portid, u32 seq, int event, u16 flags) 3805 { 3806 struct nlmsghdr *nlh; 3807 u8 scope = RT_SCOPE_UNIVERSE; 3808 int ifindex = ifmca->idev->dev->ifindex; 3809 3810 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE) 3811 scope = RT_SCOPE_SITE; 3812 3813 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags); 3814 if (nlh == NULL) 3815 return -EMSGSIZE; 3816 3817 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 3818 if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 || 3819 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp, 3820 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 3821 nlmsg_cancel(skb, nlh); 3822 return -EMSGSIZE; 3823 } 3824 3825 return nlmsg_end(skb, nlh); 3826 } 3827 3828 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca, 3829 u32 portid, u32 seq, int event, unsigned int flags) 3830 { 3831 struct nlmsghdr *nlh; 3832 u8 scope = RT_SCOPE_UNIVERSE; 3833 int ifindex = ifaca->aca_idev->dev->ifindex; 3834 3835 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE) 3836 scope = RT_SCOPE_SITE; 3837 3838 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags); 3839 if (nlh == NULL) 3840 return -EMSGSIZE; 3841 3842 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 3843 if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 || 3844 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp, 3845 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 3846 nlmsg_cancel(skb, nlh); 3847 return -EMSGSIZE; 3848 } 3849 3850 return nlmsg_end(skb, nlh); 3851 } 3852 3853 enum addr_type_t { 3854 UNICAST_ADDR, 3855 MULTICAST_ADDR, 3856 ANYCAST_ADDR, 3857 }; 3858 3859 /* called with rcu_read_lock() */ 3860 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb, 3861 struct netlink_callback *cb, enum addr_type_t type, 3862 int s_ip_idx, int *p_ip_idx) 3863 { 3864 struct ifmcaddr6 *ifmca; 3865 struct ifacaddr6 *ifaca; 3866 int err = 1; 3867 int ip_idx = *p_ip_idx; 3868 3869 read_lock_bh(&idev->lock); 3870 switch (type) { 3871 case UNICAST_ADDR: { 3872 struct inet6_ifaddr *ifa; 3873 3874 /* unicast address incl. temp addr */ 3875 list_for_each_entry(ifa, &idev->addr_list, if_list) { 3876 if (++ip_idx < s_ip_idx) 3877 continue; 3878 err = inet6_fill_ifaddr(skb, ifa, 3879 NETLINK_CB(cb->skb).portid, 3880 cb->nlh->nlmsg_seq, 3881 RTM_NEWADDR, 3882 NLM_F_MULTI); 3883 if (err <= 0) 3884 break; 3885 nl_dump_check_consistent(cb, nlmsg_hdr(skb)); 3886 } 3887 break; 3888 } 3889 case MULTICAST_ADDR: 3890 /* multicast address */ 3891 for (ifmca = idev->mc_list; ifmca; 3892 ifmca = ifmca->next, ip_idx++) { 3893 if (ip_idx < s_ip_idx) 3894 continue; 3895 err = inet6_fill_ifmcaddr(skb, ifmca, 3896 NETLINK_CB(cb->skb).portid, 3897 cb->nlh->nlmsg_seq, 3898 RTM_GETMULTICAST, 3899 NLM_F_MULTI); 3900 if (err <= 0) 3901 break; 3902 } 3903 break; 3904 case ANYCAST_ADDR: 3905 /* anycast address */ 3906 for (ifaca = idev->ac_list; ifaca; 3907 ifaca = ifaca->aca_next, ip_idx++) { 3908 if (ip_idx < s_ip_idx) 3909 continue; 3910 err = inet6_fill_ifacaddr(skb, ifaca, 3911 NETLINK_CB(cb->skb).portid, 3912 cb->nlh->nlmsg_seq, 3913 RTM_GETANYCAST, 3914 NLM_F_MULTI); 3915 if (err <= 0) 3916 break; 3917 } 3918 break; 3919 default: 3920 break; 3921 } 3922 read_unlock_bh(&idev->lock); 3923 *p_ip_idx = ip_idx; 3924 return err; 3925 } 3926 3927 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb, 3928 enum addr_type_t type) 3929 { 3930 struct net *net = sock_net(skb->sk); 3931 int h, s_h; 3932 int idx, ip_idx; 3933 int s_idx, s_ip_idx; 3934 struct net_device *dev; 3935 struct inet6_dev *idev; 3936 struct hlist_head *head; 3937 3938 s_h = cb->args[0]; 3939 s_idx = idx = cb->args[1]; 3940 s_ip_idx = ip_idx = cb->args[2]; 3941 3942 rcu_read_lock(); 3943 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ net->dev_base_seq; 3944 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 3945 idx = 0; 3946 head = &net->dev_index_head[h]; 3947 hlist_for_each_entry_rcu(dev, head, index_hlist) { 3948 if (idx < s_idx) 3949 goto cont; 3950 if (h > s_h || idx > s_idx) 3951 s_ip_idx = 0; 3952 ip_idx = 0; 3953 idev = __in6_dev_get(dev); 3954 if (!idev) 3955 goto cont; 3956 3957 if (in6_dump_addrs(idev, skb, cb, type, 3958 s_ip_idx, &ip_idx) <= 0) 3959 goto done; 3960 cont: 3961 idx++; 3962 } 3963 } 3964 done: 3965 rcu_read_unlock(); 3966 cb->args[0] = h; 3967 cb->args[1] = idx; 3968 cb->args[2] = ip_idx; 3969 3970 return skb->len; 3971 } 3972 3973 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb) 3974 { 3975 enum addr_type_t type = UNICAST_ADDR; 3976 3977 return inet6_dump_addr(skb, cb, type); 3978 } 3979 3980 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb) 3981 { 3982 enum addr_type_t type = MULTICAST_ADDR; 3983 3984 return inet6_dump_addr(skb, cb, type); 3985 } 3986 3987 3988 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb) 3989 { 3990 enum addr_type_t type = ANYCAST_ADDR; 3991 3992 return inet6_dump_addr(skb, cb, type); 3993 } 3994 3995 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh) 3996 { 3997 struct net *net = sock_net(in_skb->sk); 3998 struct ifaddrmsg *ifm; 3999 struct nlattr *tb[IFA_MAX+1]; 4000 struct in6_addr *addr = NULL, *peer; 4001 struct net_device *dev = NULL; 4002 struct inet6_ifaddr *ifa; 4003 struct sk_buff *skb; 4004 int err; 4005 4006 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy); 4007 if (err < 0) 4008 goto errout; 4009 4010 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer); 4011 if (addr == NULL) { 4012 err = -EINVAL; 4013 goto errout; 4014 } 4015 4016 ifm = nlmsg_data(nlh); 4017 if (ifm->ifa_index) 4018 dev = __dev_get_by_index(net, ifm->ifa_index); 4019 4020 ifa = ipv6_get_ifaddr(net, addr, dev, 1); 4021 if (!ifa) { 4022 err = -EADDRNOTAVAIL; 4023 goto errout; 4024 } 4025 4026 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL); 4027 if (!skb) { 4028 err = -ENOBUFS; 4029 goto errout_ifa; 4030 } 4031 4032 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).portid, 4033 nlh->nlmsg_seq, RTM_NEWADDR, 0); 4034 if (err < 0) { 4035 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 4036 WARN_ON(err == -EMSGSIZE); 4037 kfree_skb(skb); 4038 goto errout_ifa; 4039 } 4040 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid); 4041 errout_ifa: 4042 in6_ifa_put(ifa); 4043 errout: 4044 return err; 4045 } 4046 4047 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa) 4048 { 4049 struct sk_buff *skb; 4050 struct net *net = dev_net(ifa->idev->dev); 4051 int err = -ENOBUFS; 4052 4053 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC); 4054 if (skb == NULL) 4055 goto errout; 4056 4057 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0); 4058 if (err < 0) { 4059 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 4060 WARN_ON(err == -EMSGSIZE); 4061 kfree_skb(skb); 4062 goto errout; 4063 } 4064 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC); 4065 return; 4066 errout: 4067 if (err < 0) 4068 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err); 4069 } 4070 4071 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf, 4072 __s32 *array, int bytes) 4073 { 4074 BUG_ON(bytes < (DEVCONF_MAX * 4)); 4075 4076 memset(array, 0, bytes); 4077 array[DEVCONF_FORWARDING] = cnf->forwarding; 4078 array[DEVCONF_HOPLIMIT] = cnf->hop_limit; 4079 array[DEVCONF_MTU6] = cnf->mtu6; 4080 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra; 4081 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects; 4082 array[DEVCONF_AUTOCONF] = cnf->autoconf; 4083 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits; 4084 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits; 4085 array[DEVCONF_RTR_SOLICIT_INTERVAL] = 4086 jiffies_to_msecs(cnf->rtr_solicit_interval); 4087 array[DEVCONF_RTR_SOLICIT_DELAY] = 4088 jiffies_to_msecs(cnf->rtr_solicit_delay); 4089 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version; 4090 array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] = 4091 jiffies_to_msecs(cnf->mldv1_unsolicited_report_interval); 4092 array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] = 4093 jiffies_to_msecs(cnf->mldv2_unsolicited_report_interval); 4094 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr; 4095 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft; 4096 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft; 4097 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry; 4098 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor; 4099 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses; 4100 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr; 4101 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo; 4102 #ifdef CONFIG_IPV6_ROUTER_PREF 4103 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref; 4104 array[DEVCONF_RTR_PROBE_INTERVAL] = 4105 jiffies_to_msecs(cnf->rtr_probe_interval); 4106 #ifdef CONFIG_IPV6_ROUTE_INFO 4107 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen; 4108 #endif 4109 #endif 4110 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp; 4111 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route; 4112 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 4113 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad; 4114 #endif 4115 #ifdef CONFIG_IPV6_MROUTE 4116 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding; 4117 #endif 4118 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6; 4119 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad; 4120 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao; 4121 array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify; 4122 array[DEVCONF_SUPPRESS_FRAG_NDISC] = cnf->suppress_frag_ndisc; 4123 } 4124 4125 static inline size_t inet6_ifla6_size(void) 4126 { 4127 return nla_total_size(4) /* IFLA_INET6_FLAGS */ 4128 + nla_total_size(sizeof(struct ifla_cacheinfo)) 4129 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */ 4130 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */ 4131 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */ 4132 + nla_total_size(sizeof(struct in6_addr)); /* IFLA_INET6_TOKEN */ 4133 } 4134 4135 static inline size_t inet6_if_nlmsg_size(void) 4136 { 4137 return NLMSG_ALIGN(sizeof(struct ifinfomsg)) 4138 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */ 4139 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */ 4140 + nla_total_size(4) /* IFLA_MTU */ 4141 + nla_total_size(4) /* IFLA_LINK */ 4142 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */ 4143 } 4144 4145 static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib, 4146 int items, int bytes) 4147 { 4148 int i; 4149 int pad = bytes - sizeof(u64) * items; 4150 BUG_ON(pad < 0); 4151 4152 /* Use put_unaligned() because stats may not be aligned for u64. */ 4153 put_unaligned(items, &stats[0]); 4154 for (i = 1; i < items; i++) 4155 put_unaligned(atomic_long_read(&mib[i]), &stats[i]); 4156 4157 memset(&stats[items], 0, pad); 4158 } 4159 4160 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu **mib, 4161 int items, int bytes, size_t syncpoff) 4162 { 4163 int i; 4164 int pad = bytes - sizeof(u64) * items; 4165 BUG_ON(pad < 0); 4166 4167 /* Use put_unaligned() because stats may not be aligned for u64. */ 4168 put_unaligned(items, &stats[0]); 4169 for (i = 1; i < items; i++) 4170 put_unaligned(snmp_fold_field64(mib, i, syncpoff), &stats[i]); 4171 4172 memset(&stats[items], 0, pad); 4173 } 4174 4175 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype, 4176 int bytes) 4177 { 4178 switch (attrtype) { 4179 case IFLA_INET6_STATS: 4180 __snmp6_fill_stats64(stats, (void __percpu **)idev->stats.ipv6, 4181 IPSTATS_MIB_MAX, bytes, offsetof(struct ipstats_mib, syncp)); 4182 break; 4183 case IFLA_INET6_ICMP6STATS: 4184 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, ICMP6_MIB_MAX, bytes); 4185 break; 4186 } 4187 } 4188 4189 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev) 4190 { 4191 struct nlattr *nla; 4192 struct ifla_cacheinfo ci; 4193 4194 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags)) 4195 goto nla_put_failure; 4196 ci.max_reasm_len = IPV6_MAXPLEN; 4197 ci.tstamp = cstamp_delta(idev->tstamp); 4198 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time); 4199 ci.retrans_time = jiffies_to_msecs(idev->nd_parms->retrans_time); 4200 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci)) 4201 goto nla_put_failure; 4202 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32)); 4203 if (nla == NULL) 4204 goto nla_put_failure; 4205 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla)); 4206 4207 /* XXX - MC not implemented */ 4208 4209 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64)); 4210 if (nla == NULL) 4211 goto nla_put_failure; 4212 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla)); 4213 4214 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64)); 4215 if (nla == NULL) 4216 goto nla_put_failure; 4217 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla)); 4218 4219 nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr)); 4220 if (nla == NULL) 4221 goto nla_put_failure; 4222 read_lock_bh(&idev->lock); 4223 memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla)); 4224 read_unlock_bh(&idev->lock); 4225 4226 return 0; 4227 4228 nla_put_failure: 4229 return -EMSGSIZE; 4230 } 4231 4232 static size_t inet6_get_link_af_size(const struct net_device *dev) 4233 { 4234 if (!__in6_dev_get(dev)) 4235 return 0; 4236 4237 return inet6_ifla6_size(); 4238 } 4239 4240 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev) 4241 { 4242 struct inet6_dev *idev = __in6_dev_get(dev); 4243 4244 if (!idev) 4245 return -ENODATA; 4246 4247 if (inet6_fill_ifla6_attrs(skb, idev) < 0) 4248 return -EMSGSIZE; 4249 4250 return 0; 4251 } 4252 4253 static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token) 4254 { 4255 struct inet6_ifaddr *ifp; 4256 struct net_device *dev = idev->dev; 4257 bool update_rs = false; 4258 struct in6_addr ll_addr; 4259 4260 if (token == NULL) 4261 return -EINVAL; 4262 if (ipv6_addr_any(token)) 4263 return -EINVAL; 4264 if (dev->flags & (IFF_LOOPBACK | IFF_NOARP)) 4265 return -EINVAL; 4266 if (!ipv6_accept_ra(idev)) 4267 return -EINVAL; 4268 if (idev->cnf.rtr_solicits <= 0) 4269 return -EINVAL; 4270 4271 write_lock_bh(&idev->lock); 4272 4273 BUILD_BUG_ON(sizeof(token->s6_addr) != 16); 4274 memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8); 4275 4276 write_unlock_bh(&idev->lock); 4277 4278 if (!idev->dead && (idev->if_flags & IF_READY) && 4279 !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE | 4280 IFA_F_OPTIMISTIC)) { 4281 4282 /* If we're not ready, then normal ifup will take care 4283 * of this. Otherwise, we need to request our rs here. 4284 */ 4285 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters); 4286 update_rs = true; 4287 } 4288 4289 write_lock_bh(&idev->lock); 4290 4291 if (update_rs) { 4292 idev->if_flags |= IF_RS_SENT; 4293 idev->rs_probes = 1; 4294 addrconf_mod_rs_timer(idev, idev->cnf.rtr_solicit_interval); 4295 } 4296 4297 /* Well, that's kinda nasty ... */ 4298 list_for_each_entry(ifp, &idev->addr_list, if_list) { 4299 spin_lock(&ifp->lock); 4300 if (ifp->tokenized) { 4301 ifp->valid_lft = 0; 4302 ifp->prefered_lft = 0; 4303 } 4304 spin_unlock(&ifp->lock); 4305 } 4306 4307 write_unlock_bh(&idev->lock); 4308 addrconf_verify(0); 4309 return 0; 4310 } 4311 4312 static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla) 4313 { 4314 int err = -EINVAL; 4315 struct inet6_dev *idev = __in6_dev_get(dev); 4316 struct nlattr *tb[IFLA_INET6_MAX + 1]; 4317 4318 if (!idev) 4319 return -EAFNOSUPPORT; 4320 4321 if (nla_parse_nested(tb, IFLA_INET6_MAX, nla, NULL) < 0) 4322 BUG(); 4323 4324 if (tb[IFLA_INET6_TOKEN]) 4325 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN])); 4326 4327 return err; 4328 } 4329 4330 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev, 4331 u32 portid, u32 seq, int event, unsigned int flags) 4332 { 4333 struct net_device *dev = idev->dev; 4334 struct ifinfomsg *hdr; 4335 struct nlmsghdr *nlh; 4336 void *protoinfo; 4337 4338 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags); 4339 if (nlh == NULL) 4340 return -EMSGSIZE; 4341 4342 hdr = nlmsg_data(nlh); 4343 hdr->ifi_family = AF_INET6; 4344 hdr->__ifi_pad = 0; 4345 hdr->ifi_type = dev->type; 4346 hdr->ifi_index = dev->ifindex; 4347 hdr->ifi_flags = dev_get_flags(dev); 4348 hdr->ifi_change = 0; 4349 4350 if (nla_put_string(skb, IFLA_IFNAME, dev->name) || 4351 (dev->addr_len && 4352 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) || 4353 nla_put_u32(skb, IFLA_MTU, dev->mtu) || 4354 (dev->ifindex != dev->iflink && 4355 nla_put_u32(skb, IFLA_LINK, dev->iflink))) 4356 goto nla_put_failure; 4357 protoinfo = nla_nest_start(skb, IFLA_PROTINFO); 4358 if (protoinfo == NULL) 4359 goto nla_put_failure; 4360 4361 if (inet6_fill_ifla6_attrs(skb, idev) < 0) 4362 goto nla_put_failure; 4363 4364 nla_nest_end(skb, protoinfo); 4365 return nlmsg_end(skb, nlh); 4366 4367 nla_put_failure: 4368 nlmsg_cancel(skb, nlh); 4369 return -EMSGSIZE; 4370 } 4371 4372 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb) 4373 { 4374 struct net *net = sock_net(skb->sk); 4375 int h, s_h; 4376 int idx = 0, s_idx; 4377 struct net_device *dev; 4378 struct inet6_dev *idev; 4379 struct hlist_head *head; 4380 4381 s_h = cb->args[0]; 4382 s_idx = cb->args[1]; 4383 4384 rcu_read_lock(); 4385 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 4386 idx = 0; 4387 head = &net->dev_index_head[h]; 4388 hlist_for_each_entry_rcu(dev, head, index_hlist) { 4389 if (idx < s_idx) 4390 goto cont; 4391 idev = __in6_dev_get(dev); 4392 if (!idev) 4393 goto cont; 4394 if (inet6_fill_ifinfo(skb, idev, 4395 NETLINK_CB(cb->skb).portid, 4396 cb->nlh->nlmsg_seq, 4397 RTM_NEWLINK, NLM_F_MULTI) <= 0) 4398 goto out; 4399 cont: 4400 idx++; 4401 } 4402 } 4403 out: 4404 rcu_read_unlock(); 4405 cb->args[1] = idx; 4406 cb->args[0] = h; 4407 4408 return skb->len; 4409 } 4410 4411 void inet6_ifinfo_notify(int event, struct inet6_dev *idev) 4412 { 4413 struct sk_buff *skb; 4414 struct net *net = dev_net(idev->dev); 4415 int err = -ENOBUFS; 4416 4417 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC); 4418 if (skb == NULL) 4419 goto errout; 4420 4421 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0); 4422 if (err < 0) { 4423 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */ 4424 WARN_ON(err == -EMSGSIZE); 4425 kfree_skb(skb); 4426 goto errout; 4427 } 4428 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC); 4429 return; 4430 errout: 4431 if (err < 0) 4432 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err); 4433 } 4434 4435 static inline size_t inet6_prefix_nlmsg_size(void) 4436 { 4437 return NLMSG_ALIGN(sizeof(struct prefixmsg)) 4438 + nla_total_size(sizeof(struct in6_addr)) 4439 + nla_total_size(sizeof(struct prefix_cacheinfo)); 4440 } 4441 4442 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev, 4443 struct prefix_info *pinfo, u32 portid, u32 seq, 4444 int event, unsigned int flags) 4445 { 4446 struct prefixmsg *pmsg; 4447 struct nlmsghdr *nlh; 4448 struct prefix_cacheinfo ci; 4449 4450 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags); 4451 if (nlh == NULL) 4452 return -EMSGSIZE; 4453 4454 pmsg = nlmsg_data(nlh); 4455 pmsg->prefix_family = AF_INET6; 4456 pmsg->prefix_pad1 = 0; 4457 pmsg->prefix_pad2 = 0; 4458 pmsg->prefix_ifindex = idev->dev->ifindex; 4459 pmsg->prefix_len = pinfo->prefix_len; 4460 pmsg->prefix_type = pinfo->type; 4461 pmsg->prefix_pad3 = 0; 4462 pmsg->prefix_flags = 0; 4463 if (pinfo->onlink) 4464 pmsg->prefix_flags |= IF_PREFIX_ONLINK; 4465 if (pinfo->autoconf) 4466 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF; 4467 4468 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix)) 4469 goto nla_put_failure; 4470 ci.preferred_time = ntohl(pinfo->prefered); 4471 ci.valid_time = ntohl(pinfo->valid); 4472 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci)) 4473 goto nla_put_failure; 4474 return nlmsg_end(skb, nlh); 4475 4476 nla_put_failure: 4477 nlmsg_cancel(skb, nlh); 4478 return -EMSGSIZE; 4479 } 4480 4481 static void inet6_prefix_notify(int event, struct inet6_dev *idev, 4482 struct prefix_info *pinfo) 4483 { 4484 struct sk_buff *skb; 4485 struct net *net = dev_net(idev->dev); 4486 int err = -ENOBUFS; 4487 4488 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC); 4489 if (skb == NULL) 4490 goto errout; 4491 4492 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0); 4493 if (err < 0) { 4494 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */ 4495 WARN_ON(err == -EMSGSIZE); 4496 kfree_skb(skb); 4497 goto errout; 4498 } 4499 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC); 4500 return; 4501 errout: 4502 if (err < 0) 4503 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err); 4504 } 4505 4506 static void update_valid_ll_addr_cnt(struct inet6_ifaddr *ifp, int count) 4507 { 4508 write_lock_bh(&ifp->idev->lock); 4509 spin_lock(&ifp->lock); 4510 if (((ifp->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE|IFA_F_OPTIMISTIC| 4511 IFA_F_DADFAILED)) == IFA_F_PERMANENT) && 4512 (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) 4513 ifp->idev->valid_ll_addr_cnt += count; 4514 WARN_ON(ifp->idev->valid_ll_addr_cnt < 0); 4515 spin_unlock(&ifp->lock); 4516 write_unlock_bh(&ifp->idev->lock); 4517 } 4518 4519 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 4520 { 4521 struct net *net = dev_net(ifp->idev->dev); 4522 4523 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp); 4524 4525 switch (event) { 4526 case RTM_NEWADDR: 4527 update_valid_ll_addr_cnt(ifp, 1); 4528 4529 /* 4530 * If the address was optimistic 4531 * we inserted the route at the start of 4532 * our DAD process, so we don't need 4533 * to do it again 4534 */ 4535 if (!(ifp->rt->rt6i_node)) 4536 ip6_ins_rt(ifp->rt); 4537 if (ifp->idev->cnf.forwarding) 4538 addrconf_join_anycast(ifp); 4539 if (!ipv6_addr_any(&ifp->peer_addr)) 4540 addrconf_prefix_route(&ifp->peer_addr, 128, 4541 ifp->idev->dev, 0, 0); 4542 break; 4543 case RTM_DELADDR: 4544 update_valid_ll_addr_cnt(ifp, -1); 4545 4546 if (ifp->idev->cnf.forwarding) 4547 addrconf_leave_anycast(ifp); 4548 addrconf_leave_solict(ifp->idev, &ifp->addr); 4549 if (!ipv6_addr_any(&ifp->peer_addr)) { 4550 struct rt6_info *rt; 4551 struct net_device *dev = ifp->idev->dev; 4552 4553 rt = rt6_lookup(dev_net(dev), &ifp->peer_addr, NULL, 4554 dev->ifindex, 1); 4555 if (rt) { 4556 dst_hold(&rt->dst); 4557 if (ip6_del_rt(rt)) 4558 dst_free(&rt->dst); 4559 } 4560 } 4561 dst_hold(&ifp->rt->dst); 4562 4563 if (ip6_del_rt(ifp->rt)) 4564 dst_free(&ifp->rt->dst); 4565 break; 4566 } 4567 atomic_inc(&net->ipv6.dev_addr_genid); 4568 rt_genid_bump_ipv6(net); 4569 } 4570 4571 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 4572 { 4573 rcu_read_lock_bh(); 4574 if (likely(ifp->idev->dead == 0)) 4575 __ipv6_ifa_notify(event, ifp); 4576 rcu_read_unlock_bh(); 4577 } 4578 4579 #ifdef CONFIG_SYSCTL 4580 4581 static 4582 int addrconf_sysctl_forward(struct ctl_table *ctl, int write, 4583 void __user *buffer, size_t *lenp, loff_t *ppos) 4584 { 4585 int *valp = ctl->data; 4586 int val = *valp; 4587 loff_t pos = *ppos; 4588 struct ctl_table lctl; 4589 int ret; 4590 4591 /* 4592 * ctl->data points to idev->cnf.forwarding, we should 4593 * not modify it until we get the rtnl lock. 4594 */ 4595 lctl = *ctl; 4596 lctl.data = &val; 4597 4598 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 4599 4600 if (write) 4601 ret = addrconf_fixup_forwarding(ctl, valp, val); 4602 if (ret) 4603 *ppos = pos; 4604 return ret; 4605 } 4606 4607 static void dev_disable_change(struct inet6_dev *idev) 4608 { 4609 struct netdev_notifier_info info; 4610 4611 if (!idev || !idev->dev) 4612 return; 4613 4614 netdev_notifier_info_init(&info, idev->dev); 4615 if (idev->cnf.disable_ipv6) 4616 addrconf_notify(NULL, NETDEV_DOWN, &info); 4617 else 4618 addrconf_notify(NULL, NETDEV_UP, &info); 4619 } 4620 4621 static void addrconf_disable_change(struct net *net, __s32 newf) 4622 { 4623 struct net_device *dev; 4624 struct inet6_dev *idev; 4625 4626 rcu_read_lock(); 4627 for_each_netdev_rcu(net, dev) { 4628 idev = __in6_dev_get(dev); 4629 if (idev) { 4630 int changed = (!idev->cnf.disable_ipv6) ^ (!newf); 4631 idev->cnf.disable_ipv6 = newf; 4632 if (changed) 4633 dev_disable_change(idev); 4634 } 4635 } 4636 rcu_read_unlock(); 4637 } 4638 4639 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf) 4640 { 4641 struct net *net; 4642 int old; 4643 4644 if (!rtnl_trylock()) 4645 return restart_syscall(); 4646 4647 net = (struct net *)table->extra2; 4648 old = *p; 4649 *p = newf; 4650 4651 if (p == &net->ipv6.devconf_dflt->disable_ipv6) { 4652 rtnl_unlock(); 4653 return 0; 4654 } 4655 4656 if (p == &net->ipv6.devconf_all->disable_ipv6) { 4657 net->ipv6.devconf_dflt->disable_ipv6 = newf; 4658 addrconf_disable_change(net, newf); 4659 } else if ((!newf) ^ (!old)) 4660 dev_disable_change((struct inet6_dev *)table->extra1); 4661 4662 rtnl_unlock(); 4663 return 0; 4664 } 4665 4666 static 4667 int addrconf_sysctl_disable(struct ctl_table *ctl, int write, 4668 void __user *buffer, size_t *lenp, loff_t *ppos) 4669 { 4670 int *valp = ctl->data; 4671 int val = *valp; 4672 loff_t pos = *ppos; 4673 struct ctl_table lctl; 4674 int ret; 4675 4676 /* 4677 * ctl->data points to idev->cnf.disable_ipv6, we should 4678 * not modify it until we get the rtnl lock. 4679 */ 4680 lctl = *ctl; 4681 lctl.data = &val; 4682 4683 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 4684 4685 if (write) 4686 ret = addrconf_disable_ipv6(ctl, valp, val); 4687 if (ret) 4688 *ppos = pos; 4689 return ret; 4690 } 4691 4692 static struct addrconf_sysctl_table 4693 { 4694 struct ctl_table_header *sysctl_header; 4695 struct ctl_table addrconf_vars[DEVCONF_MAX+1]; 4696 } addrconf_sysctl __read_mostly = { 4697 .sysctl_header = NULL, 4698 .addrconf_vars = { 4699 { 4700 .procname = "forwarding", 4701 .data = &ipv6_devconf.forwarding, 4702 .maxlen = sizeof(int), 4703 .mode = 0644, 4704 .proc_handler = addrconf_sysctl_forward, 4705 }, 4706 { 4707 .procname = "hop_limit", 4708 .data = &ipv6_devconf.hop_limit, 4709 .maxlen = sizeof(int), 4710 .mode = 0644, 4711 .proc_handler = proc_dointvec, 4712 }, 4713 { 4714 .procname = "mtu", 4715 .data = &ipv6_devconf.mtu6, 4716 .maxlen = sizeof(int), 4717 .mode = 0644, 4718 .proc_handler = proc_dointvec, 4719 }, 4720 { 4721 .procname = "accept_ra", 4722 .data = &ipv6_devconf.accept_ra, 4723 .maxlen = sizeof(int), 4724 .mode = 0644, 4725 .proc_handler = proc_dointvec, 4726 }, 4727 { 4728 .procname = "accept_redirects", 4729 .data = &ipv6_devconf.accept_redirects, 4730 .maxlen = sizeof(int), 4731 .mode = 0644, 4732 .proc_handler = proc_dointvec, 4733 }, 4734 { 4735 .procname = "autoconf", 4736 .data = &ipv6_devconf.autoconf, 4737 .maxlen = sizeof(int), 4738 .mode = 0644, 4739 .proc_handler = proc_dointvec, 4740 }, 4741 { 4742 .procname = "dad_transmits", 4743 .data = &ipv6_devconf.dad_transmits, 4744 .maxlen = sizeof(int), 4745 .mode = 0644, 4746 .proc_handler = proc_dointvec, 4747 }, 4748 { 4749 .procname = "router_solicitations", 4750 .data = &ipv6_devconf.rtr_solicits, 4751 .maxlen = sizeof(int), 4752 .mode = 0644, 4753 .proc_handler = proc_dointvec, 4754 }, 4755 { 4756 .procname = "router_solicitation_interval", 4757 .data = &ipv6_devconf.rtr_solicit_interval, 4758 .maxlen = sizeof(int), 4759 .mode = 0644, 4760 .proc_handler = proc_dointvec_jiffies, 4761 }, 4762 { 4763 .procname = "router_solicitation_delay", 4764 .data = &ipv6_devconf.rtr_solicit_delay, 4765 .maxlen = sizeof(int), 4766 .mode = 0644, 4767 .proc_handler = proc_dointvec_jiffies, 4768 }, 4769 { 4770 .procname = "force_mld_version", 4771 .data = &ipv6_devconf.force_mld_version, 4772 .maxlen = sizeof(int), 4773 .mode = 0644, 4774 .proc_handler = proc_dointvec, 4775 }, 4776 { 4777 .procname = "mldv1_unsolicited_report_interval", 4778 .data = 4779 &ipv6_devconf.mldv1_unsolicited_report_interval, 4780 .maxlen = sizeof(int), 4781 .mode = 0644, 4782 .proc_handler = proc_dointvec_ms_jiffies, 4783 }, 4784 { 4785 .procname = "mldv2_unsolicited_report_interval", 4786 .data = 4787 &ipv6_devconf.mldv2_unsolicited_report_interval, 4788 .maxlen = sizeof(int), 4789 .mode = 0644, 4790 .proc_handler = proc_dointvec_ms_jiffies, 4791 }, 4792 { 4793 .procname = "use_tempaddr", 4794 .data = &ipv6_devconf.use_tempaddr, 4795 .maxlen = sizeof(int), 4796 .mode = 0644, 4797 .proc_handler = proc_dointvec, 4798 }, 4799 { 4800 .procname = "temp_valid_lft", 4801 .data = &ipv6_devconf.temp_valid_lft, 4802 .maxlen = sizeof(int), 4803 .mode = 0644, 4804 .proc_handler = proc_dointvec, 4805 }, 4806 { 4807 .procname = "temp_prefered_lft", 4808 .data = &ipv6_devconf.temp_prefered_lft, 4809 .maxlen = sizeof(int), 4810 .mode = 0644, 4811 .proc_handler = proc_dointvec, 4812 }, 4813 { 4814 .procname = "regen_max_retry", 4815 .data = &ipv6_devconf.regen_max_retry, 4816 .maxlen = sizeof(int), 4817 .mode = 0644, 4818 .proc_handler = proc_dointvec, 4819 }, 4820 { 4821 .procname = "max_desync_factor", 4822 .data = &ipv6_devconf.max_desync_factor, 4823 .maxlen = sizeof(int), 4824 .mode = 0644, 4825 .proc_handler = proc_dointvec, 4826 }, 4827 { 4828 .procname = "max_addresses", 4829 .data = &ipv6_devconf.max_addresses, 4830 .maxlen = sizeof(int), 4831 .mode = 0644, 4832 .proc_handler = proc_dointvec, 4833 }, 4834 { 4835 .procname = "accept_ra_defrtr", 4836 .data = &ipv6_devconf.accept_ra_defrtr, 4837 .maxlen = sizeof(int), 4838 .mode = 0644, 4839 .proc_handler = proc_dointvec, 4840 }, 4841 { 4842 .procname = "accept_ra_pinfo", 4843 .data = &ipv6_devconf.accept_ra_pinfo, 4844 .maxlen = sizeof(int), 4845 .mode = 0644, 4846 .proc_handler = proc_dointvec, 4847 }, 4848 #ifdef CONFIG_IPV6_ROUTER_PREF 4849 { 4850 .procname = "accept_ra_rtr_pref", 4851 .data = &ipv6_devconf.accept_ra_rtr_pref, 4852 .maxlen = sizeof(int), 4853 .mode = 0644, 4854 .proc_handler = proc_dointvec, 4855 }, 4856 { 4857 .procname = "router_probe_interval", 4858 .data = &ipv6_devconf.rtr_probe_interval, 4859 .maxlen = sizeof(int), 4860 .mode = 0644, 4861 .proc_handler = proc_dointvec_jiffies, 4862 }, 4863 #ifdef CONFIG_IPV6_ROUTE_INFO 4864 { 4865 .procname = "accept_ra_rt_info_max_plen", 4866 .data = &ipv6_devconf.accept_ra_rt_info_max_plen, 4867 .maxlen = sizeof(int), 4868 .mode = 0644, 4869 .proc_handler = proc_dointvec, 4870 }, 4871 #endif 4872 #endif 4873 { 4874 .procname = "proxy_ndp", 4875 .data = &ipv6_devconf.proxy_ndp, 4876 .maxlen = sizeof(int), 4877 .mode = 0644, 4878 .proc_handler = proc_dointvec, 4879 }, 4880 { 4881 .procname = "accept_source_route", 4882 .data = &ipv6_devconf.accept_source_route, 4883 .maxlen = sizeof(int), 4884 .mode = 0644, 4885 .proc_handler = proc_dointvec, 4886 }, 4887 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 4888 { 4889 .procname = "optimistic_dad", 4890 .data = &ipv6_devconf.optimistic_dad, 4891 .maxlen = sizeof(int), 4892 .mode = 0644, 4893 .proc_handler = proc_dointvec, 4894 4895 }, 4896 #endif 4897 #ifdef CONFIG_IPV6_MROUTE 4898 { 4899 .procname = "mc_forwarding", 4900 .data = &ipv6_devconf.mc_forwarding, 4901 .maxlen = sizeof(int), 4902 .mode = 0444, 4903 .proc_handler = proc_dointvec, 4904 }, 4905 #endif 4906 { 4907 .procname = "disable_ipv6", 4908 .data = &ipv6_devconf.disable_ipv6, 4909 .maxlen = sizeof(int), 4910 .mode = 0644, 4911 .proc_handler = addrconf_sysctl_disable, 4912 }, 4913 { 4914 .procname = "accept_dad", 4915 .data = &ipv6_devconf.accept_dad, 4916 .maxlen = sizeof(int), 4917 .mode = 0644, 4918 .proc_handler = proc_dointvec, 4919 }, 4920 { 4921 .procname = "force_tllao", 4922 .data = &ipv6_devconf.force_tllao, 4923 .maxlen = sizeof(int), 4924 .mode = 0644, 4925 .proc_handler = proc_dointvec 4926 }, 4927 { 4928 .procname = "ndisc_notify", 4929 .data = &ipv6_devconf.ndisc_notify, 4930 .maxlen = sizeof(int), 4931 .mode = 0644, 4932 .proc_handler = proc_dointvec 4933 }, 4934 { 4935 .procname = "suppress_frag_ndisc", 4936 .data = &ipv6_devconf.suppress_frag_ndisc, 4937 .maxlen = sizeof(int), 4938 .mode = 0644, 4939 .proc_handler = proc_dointvec 4940 }, 4941 { 4942 /* sentinel */ 4943 } 4944 }, 4945 }; 4946 4947 static int __addrconf_sysctl_register(struct net *net, char *dev_name, 4948 struct inet6_dev *idev, struct ipv6_devconf *p) 4949 { 4950 int i; 4951 struct addrconf_sysctl_table *t; 4952 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ]; 4953 4954 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL); 4955 if (t == NULL) 4956 goto out; 4957 4958 for (i = 0; t->addrconf_vars[i].data; i++) { 4959 t->addrconf_vars[i].data += (char *)p - (char *)&ipv6_devconf; 4960 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */ 4961 t->addrconf_vars[i].extra2 = net; 4962 } 4963 4964 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name); 4965 4966 t->sysctl_header = register_net_sysctl(net, path, t->addrconf_vars); 4967 if (t->sysctl_header == NULL) 4968 goto free; 4969 4970 p->sysctl = t; 4971 return 0; 4972 4973 free: 4974 kfree(t); 4975 out: 4976 return -ENOBUFS; 4977 } 4978 4979 static void __addrconf_sysctl_unregister(struct ipv6_devconf *p) 4980 { 4981 struct addrconf_sysctl_table *t; 4982 4983 if (p->sysctl == NULL) 4984 return; 4985 4986 t = p->sysctl; 4987 p->sysctl = NULL; 4988 unregister_net_sysctl_table(t->sysctl_header); 4989 kfree(t); 4990 } 4991 4992 static void addrconf_sysctl_register(struct inet6_dev *idev) 4993 { 4994 neigh_sysctl_register(idev->dev, idev->nd_parms, "ipv6", 4995 &ndisc_ifinfo_sysctl_change); 4996 __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name, 4997 idev, &idev->cnf); 4998 } 4999 5000 static void addrconf_sysctl_unregister(struct inet6_dev *idev) 5001 { 5002 __addrconf_sysctl_unregister(&idev->cnf); 5003 neigh_sysctl_unregister(idev->nd_parms); 5004 } 5005 5006 5007 #endif 5008 5009 static int __net_init addrconf_init_net(struct net *net) 5010 { 5011 int err = -ENOMEM; 5012 struct ipv6_devconf *all, *dflt; 5013 5014 all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL); 5015 if (all == NULL) 5016 goto err_alloc_all; 5017 5018 dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL); 5019 if (dflt == NULL) 5020 goto err_alloc_dflt; 5021 5022 /* these will be inherited by all namespaces */ 5023 dflt->autoconf = ipv6_defaults.autoconf; 5024 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6; 5025 5026 net->ipv6.devconf_all = all; 5027 net->ipv6.devconf_dflt = dflt; 5028 5029 #ifdef CONFIG_SYSCTL 5030 err = __addrconf_sysctl_register(net, "all", NULL, all); 5031 if (err < 0) 5032 goto err_reg_all; 5033 5034 err = __addrconf_sysctl_register(net, "default", NULL, dflt); 5035 if (err < 0) 5036 goto err_reg_dflt; 5037 #endif 5038 return 0; 5039 5040 #ifdef CONFIG_SYSCTL 5041 err_reg_dflt: 5042 __addrconf_sysctl_unregister(all); 5043 err_reg_all: 5044 kfree(dflt); 5045 #endif 5046 err_alloc_dflt: 5047 kfree(all); 5048 err_alloc_all: 5049 return err; 5050 } 5051 5052 static void __net_exit addrconf_exit_net(struct net *net) 5053 { 5054 #ifdef CONFIG_SYSCTL 5055 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt); 5056 __addrconf_sysctl_unregister(net->ipv6.devconf_all); 5057 #endif 5058 if (!net_eq(net, &init_net)) { 5059 kfree(net->ipv6.devconf_dflt); 5060 kfree(net->ipv6.devconf_all); 5061 } 5062 } 5063 5064 static struct pernet_operations addrconf_ops = { 5065 .init = addrconf_init_net, 5066 .exit = addrconf_exit_net, 5067 }; 5068 5069 static struct rtnl_af_ops inet6_ops = { 5070 .family = AF_INET6, 5071 .fill_link_af = inet6_fill_link_af, 5072 .get_link_af_size = inet6_get_link_af_size, 5073 .set_link_af = inet6_set_link_af, 5074 }; 5075 5076 /* 5077 * Init / cleanup code 5078 */ 5079 5080 int __init addrconf_init(void) 5081 { 5082 int i, err; 5083 5084 err = ipv6_addr_label_init(); 5085 if (err < 0) { 5086 pr_crit("%s: cannot initialize default policy table: %d\n", 5087 __func__, err); 5088 goto out; 5089 } 5090 5091 err = register_pernet_subsys(&addrconf_ops); 5092 if (err < 0) 5093 goto out_addrlabel; 5094 5095 /* The addrconf netdev notifier requires that loopback_dev 5096 * has it's ipv6 private information allocated and setup 5097 * before it can bring up and give link-local addresses 5098 * to other devices which are up. 5099 * 5100 * Unfortunately, loopback_dev is not necessarily the first 5101 * entry in the global dev_base list of net devices. In fact, 5102 * it is likely to be the very last entry on that list. 5103 * So this causes the notifier registry below to try and 5104 * give link-local addresses to all devices besides loopback_dev 5105 * first, then loopback_dev, which cases all the non-loopback_dev 5106 * devices to fail to get a link-local address. 5107 * 5108 * So, as a temporary fix, allocate the ipv6 structure for 5109 * loopback_dev first by hand. 5110 * Longer term, all of the dependencies ipv6 has upon the loopback 5111 * device and it being up should be removed. 5112 */ 5113 rtnl_lock(); 5114 if (!ipv6_add_dev(init_net.loopback_dev)) 5115 err = -ENOMEM; 5116 rtnl_unlock(); 5117 if (err) 5118 goto errlo; 5119 5120 for (i = 0; i < IN6_ADDR_HSIZE; i++) 5121 INIT_HLIST_HEAD(&inet6_addr_lst[i]); 5122 5123 register_netdevice_notifier(&ipv6_dev_notf); 5124 5125 addrconf_verify(0); 5126 5127 err = rtnl_af_register(&inet6_ops); 5128 if (err < 0) 5129 goto errout_af; 5130 5131 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo, 5132 NULL); 5133 if (err < 0) 5134 goto errout; 5135 5136 /* Only the first call to __rtnl_register can fail */ 5137 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL, NULL); 5138 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL, NULL); 5139 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr, 5140 inet6_dump_ifaddr, NULL); 5141 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL, 5142 inet6_dump_ifmcaddr, NULL); 5143 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL, 5144 inet6_dump_ifacaddr, NULL); 5145 __rtnl_register(PF_INET6, RTM_GETNETCONF, inet6_netconf_get_devconf, 5146 inet6_netconf_dump_devconf, NULL); 5147 5148 ipv6_addr_label_rtnl_register(); 5149 5150 return 0; 5151 errout: 5152 rtnl_af_unregister(&inet6_ops); 5153 errout_af: 5154 unregister_netdevice_notifier(&ipv6_dev_notf); 5155 errlo: 5156 unregister_pernet_subsys(&addrconf_ops); 5157 out_addrlabel: 5158 ipv6_addr_label_cleanup(); 5159 out: 5160 return err; 5161 } 5162 5163 void addrconf_cleanup(void) 5164 { 5165 struct net_device *dev; 5166 int i; 5167 5168 unregister_netdevice_notifier(&ipv6_dev_notf); 5169 unregister_pernet_subsys(&addrconf_ops); 5170 ipv6_addr_label_cleanup(); 5171 5172 rtnl_lock(); 5173 5174 __rtnl_af_unregister(&inet6_ops); 5175 5176 /* clean dev list */ 5177 for_each_netdev(&init_net, dev) { 5178 if (__in6_dev_get(dev) == NULL) 5179 continue; 5180 addrconf_ifdown(dev, 1); 5181 } 5182 addrconf_ifdown(init_net.loopback_dev, 2); 5183 5184 /* 5185 * Check hash table. 5186 */ 5187 spin_lock_bh(&addrconf_hash_lock); 5188 for (i = 0; i < IN6_ADDR_HSIZE; i++) 5189 WARN_ON(!hlist_empty(&inet6_addr_lst[i])); 5190 spin_unlock_bh(&addrconf_hash_lock); 5191 5192 del_timer(&addr_chk_timer); 5193 rtnl_unlock(); 5194 } 5195