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, 2513 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME); 2514 if (!IS_ERR(ifp)) { 2515 spin_lock_bh(&ifp->lock); 2516 ifp->flags &= ~IFA_F_TENTATIVE; 2517 spin_unlock_bh(&ifp->lock); 2518 ipv6_ifa_notify(RTM_NEWADDR, ifp); 2519 in6_ifa_put(ifp); 2520 } 2521 } 2522 2523 #if IS_ENABLED(CONFIG_IPV6_SIT) 2524 static void sit_add_v4_addrs(struct inet6_dev *idev) 2525 { 2526 struct in6_addr addr; 2527 struct net_device *dev; 2528 struct net *net = dev_net(idev->dev); 2529 int scope, plen; 2530 u32 pflags = 0; 2531 2532 ASSERT_RTNL(); 2533 2534 memset(&addr, 0, sizeof(struct in6_addr)); 2535 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4); 2536 2537 if (idev->dev->flags&IFF_POINTOPOINT) { 2538 addr.s6_addr32[0] = htonl(0xfe800000); 2539 scope = IFA_LINK; 2540 plen = 64; 2541 } else { 2542 scope = IPV6_ADDR_COMPATv4; 2543 plen = 96; 2544 pflags |= RTF_NONEXTHOP; 2545 } 2546 2547 if (addr.s6_addr32[3]) { 2548 add_addr(idev, &addr, plen, scope); 2549 addrconf_prefix_route(&addr, plen, idev->dev, 0, pflags); 2550 return; 2551 } 2552 2553 for_each_netdev(net, dev) { 2554 struct in_device *in_dev = __in_dev_get_rtnl(dev); 2555 if (in_dev && (dev->flags & IFF_UP)) { 2556 struct in_ifaddr *ifa; 2557 2558 int flag = scope; 2559 2560 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) { 2561 2562 addr.s6_addr32[3] = ifa->ifa_local; 2563 2564 if (ifa->ifa_scope == RT_SCOPE_LINK) 2565 continue; 2566 if (ifa->ifa_scope >= RT_SCOPE_HOST) { 2567 if (idev->dev->flags&IFF_POINTOPOINT) 2568 continue; 2569 flag |= IFA_HOST; 2570 } 2571 2572 add_addr(idev, &addr, plen, flag); 2573 addrconf_prefix_route(&addr, plen, idev->dev, 0, 2574 pflags); 2575 } 2576 } 2577 } 2578 } 2579 #endif 2580 2581 static void init_loopback(struct net_device *dev) 2582 { 2583 struct inet6_dev *idev; 2584 struct net_device *sp_dev; 2585 struct inet6_ifaddr *sp_ifa; 2586 struct rt6_info *sp_rt; 2587 2588 /* ::1 */ 2589 2590 ASSERT_RTNL(); 2591 2592 if ((idev = ipv6_find_idev(dev)) == NULL) { 2593 pr_debug("%s: add_dev failed\n", __func__); 2594 return; 2595 } 2596 2597 add_addr(idev, &in6addr_loopback, 128, IFA_HOST); 2598 2599 /* Add routes to other interface's IPv6 addresses */ 2600 for_each_netdev(dev_net(dev), sp_dev) { 2601 if (!strcmp(sp_dev->name, dev->name)) 2602 continue; 2603 2604 idev = __in6_dev_get(sp_dev); 2605 if (!idev) 2606 continue; 2607 2608 read_lock_bh(&idev->lock); 2609 list_for_each_entry(sp_ifa, &idev->addr_list, if_list) { 2610 2611 if (sp_ifa->flags & (IFA_F_DADFAILED | IFA_F_TENTATIVE)) 2612 continue; 2613 2614 if (sp_ifa->rt) 2615 continue; 2616 2617 sp_rt = addrconf_dst_alloc(idev, &sp_ifa->addr, false); 2618 2619 /* Failure cases are ignored */ 2620 if (!IS_ERR(sp_rt)) { 2621 sp_ifa->rt = sp_rt; 2622 ip6_ins_rt(sp_rt); 2623 } 2624 } 2625 read_unlock_bh(&idev->lock); 2626 } 2627 } 2628 2629 static void addrconf_add_linklocal(struct inet6_dev *idev, const struct in6_addr *addr) 2630 { 2631 struct inet6_ifaddr *ifp; 2632 u32 addr_flags = IFA_F_PERMANENT; 2633 2634 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 2635 if (idev->cnf.optimistic_dad && 2636 !dev_net(idev->dev)->ipv6.devconf_all->forwarding) 2637 addr_flags |= IFA_F_OPTIMISTIC; 2638 #endif 2639 2640 2641 ifp = ipv6_add_addr(idev, addr, NULL, 64, IFA_LINK, addr_flags, 2642 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME); 2643 if (!IS_ERR(ifp)) { 2644 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0); 2645 addrconf_dad_start(ifp); 2646 in6_ifa_put(ifp); 2647 } 2648 } 2649 2650 static void addrconf_dev_config(struct net_device *dev) 2651 { 2652 struct in6_addr addr; 2653 struct inet6_dev *idev; 2654 2655 ASSERT_RTNL(); 2656 2657 if ((dev->type != ARPHRD_ETHER) && 2658 (dev->type != ARPHRD_FDDI) && 2659 (dev->type != ARPHRD_ARCNET) && 2660 (dev->type != ARPHRD_INFINIBAND) && 2661 (dev->type != ARPHRD_IEEE802154) && 2662 (dev->type != ARPHRD_IEEE1394) && 2663 (dev->type != ARPHRD_TUNNEL6)) { 2664 /* Alas, we support only Ethernet autoconfiguration. */ 2665 return; 2666 } 2667 2668 idev = addrconf_add_dev(dev); 2669 if (IS_ERR(idev)) 2670 return; 2671 2672 memset(&addr, 0, sizeof(struct in6_addr)); 2673 addr.s6_addr32[0] = htonl(0xFE800000); 2674 2675 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0) 2676 addrconf_add_linklocal(idev, &addr); 2677 } 2678 2679 #if IS_ENABLED(CONFIG_IPV6_SIT) 2680 static void addrconf_sit_config(struct net_device *dev) 2681 { 2682 struct inet6_dev *idev; 2683 2684 ASSERT_RTNL(); 2685 2686 /* 2687 * Configure the tunnel with one of our IPv4 2688 * addresses... we should configure all of 2689 * our v4 addrs in the tunnel 2690 */ 2691 2692 if ((idev = ipv6_find_idev(dev)) == NULL) { 2693 pr_debug("%s: add_dev failed\n", __func__); 2694 return; 2695 } 2696 2697 if (dev->priv_flags & IFF_ISATAP) { 2698 struct in6_addr addr; 2699 2700 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0); 2701 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev)) 2702 addrconf_add_linklocal(idev, &addr); 2703 return; 2704 } 2705 2706 sit_add_v4_addrs(idev); 2707 2708 if (dev->flags&IFF_POINTOPOINT) 2709 addrconf_add_mroute(dev); 2710 } 2711 #endif 2712 2713 #if IS_ENABLED(CONFIG_NET_IPGRE) 2714 static void addrconf_gre_config(struct net_device *dev) 2715 { 2716 struct inet6_dev *idev; 2717 struct in6_addr addr; 2718 2719 ASSERT_RTNL(); 2720 2721 if ((idev = ipv6_find_idev(dev)) == NULL) { 2722 pr_debug("%s: add_dev failed\n", __func__); 2723 return; 2724 } 2725 2726 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0); 2727 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev)) 2728 addrconf_add_linklocal(idev, &addr); 2729 } 2730 #endif 2731 2732 static inline int 2733 ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev) 2734 { 2735 struct in6_addr lladdr; 2736 2737 if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) { 2738 addrconf_add_linklocal(idev, &lladdr); 2739 return 0; 2740 } 2741 return -1; 2742 } 2743 2744 static int addrconf_notify(struct notifier_block *this, unsigned long event, 2745 void *ptr) 2746 { 2747 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 2748 struct inet6_dev *idev = __in6_dev_get(dev); 2749 int run_pending = 0; 2750 int err; 2751 2752 switch (event) { 2753 case NETDEV_REGISTER: 2754 if (!idev && dev->mtu >= IPV6_MIN_MTU) { 2755 idev = ipv6_add_dev(dev); 2756 if (!idev) 2757 return notifier_from_errno(-ENOMEM); 2758 } 2759 break; 2760 2761 case NETDEV_UP: 2762 case NETDEV_CHANGE: 2763 if (dev->flags & IFF_SLAVE) 2764 break; 2765 2766 if (event == NETDEV_UP) { 2767 if (!addrconf_qdisc_ok(dev)) { 2768 /* device is not ready yet. */ 2769 pr_info("ADDRCONF(NETDEV_UP): %s: link is not ready\n", 2770 dev->name); 2771 break; 2772 } 2773 2774 if (!idev && dev->mtu >= IPV6_MIN_MTU) 2775 idev = ipv6_add_dev(dev); 2776 2777 if (idev) { 2778 idev->if_flags |= IF_READY; 2779 run_pending = 1; 2780 } 2781 } else { 2782 if (!addrconf_qdisc_ok(dev)) { 2783 /* device is still not ready. */ 2784 break; 2785 } 2786 2787 if (idev) { 2788 if (idev->if_flags & IF_READY) 2789 /* device is already configured. */ 2790 break; 2791 idev->if_flags |= IF_READY; 2792 } 2793 2794 pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n", 2795 dev->name); 2796 2797 run_pending = 1; 2798 } 2799 2800 switch (dev->type) { 2801 #if IS_ENABLED(CONFIG_IPV6_SIT) 2802 case ARPHRD_SIT: 2803 addrconf_sit_config(dev); 2804 break; 2805 #endif 2806 #if IS_ENABLED(CONFIG_NET_IPGRE) 2807 case ARPHRD_IPGRE: 2808 addrconf_gre_config(dev); 2809 break; 2810 #endif 2811 case ARPHRD_LOOPBACK: 2812 init_loopback(dev); 2813 break; 2814 2815 default: 2816 addrconf_dev_config(dev); 2817 break; 2818 } 2819 2820 if (idev) { 2821 if (run_pending) 2822 addrconf_dad_run(idev); 2823 2824 /* 2825 * If the MTU changed during the interface down, 2826 * when the interface up, the changed MTU must be 2827 * reflected in the idev as well as routers. 2828 */ 2829 if (idev->cnf.mtu6 != dev->mtu && 2830 dev->mtu >= IPV6_MIN_MTU) { 2831 rt6_mtu_change(dev, dev->mtu); 2832 idev->cnf.mtu6 = dev->mtu; 2833 } 2834 idev->tstamp = jiffies; 2835 inet6_ifinfo_notify(RTM_NEWLINK, idev); 2836 2837 /* 2838 * If the changed mtu during down is lower than 2839 * IPV6_MIN_MTU stop IPv6 on this interface. 2840 */ 2841 if (dev->mtu < IPV6_MIN_MTU) 2842 addrconf_ifdown(dev, 1); 2843 } 2844 break; 2845 2846 case NETDEV_CHANGEMTU: 2847 if (idev && dev->mtu >= IPV6_MIN_MTU) { 2848 rt6_mtu_change(dev, dev->mtu); 2849 idev->cnf.mtu6 = dev->mtu; 2850 break; 2851 } 2852 2853 if (!idev && dev->mtu >= IPV6_MIN_MTU) { 2854 idev = ipv6_add_dev(dev); 2855 if (idev) 2856 break; 2857 } 2858 2859 /* 2860 * MTU falled under IPV6_MIN_MTU. 2861 * Stop IPv6 on this interface. 2862 */ 2863 2864 case NETDEV_DOWN: 2865 case NETDEV_UNREGISTER: 2866 /* 2867 * Remove all addresses from this interface. 2868 */ 2869 addrconf_ifdown(dev, event != NETDEV_DOWN); 2870 break; 2871 2872 case NETDEV_CHANGENAME: 2873 if (idev) { 2874 snmp6_unregister_dev(idev); 2875 addrconf_sysctl_unregister(idev); 2876 addrconf_sysctl_register(idev); 2877 err = snmp6_register_dev(idev); 2878 if (err) 2879 return notifier_from_errno(err); 2880 } 2881 break; 2882 2883 case NETDEV_PRE_TYPE_CHANGE: 2884 case NETDEV_POST_TYPE_CHANGE: 2885 addrconf_type_change(dev, event); 2886 break; 2887 } 2888 2889 return NOTIFY_OK; 2890 } 2891 2892 /* 2893 * addrconf module should be notified of a device going up 2894 */ 2895 static struct notifier_block ipv6_dev_notf = { 2896 .notifier_call = addrconf_notify, 2897 }; 2898 2899 static void addrconf_type_change(struct net_device *dev, unsigned long event) 2900 { 2901 struct inet6_dev *idev; 2902 ASSERT_RTNL(); 2903 2904 idev = __in6_dev_get(dev); 2905 2906 if (event == NETDEV_POST_TYPE_CHANGE) 2907 ipv6_mc_remap(idev); 2908 else if (event == NETDEV_PRE_TYPE_CHANGE) 2909 ipv6_mc_unmap(idev); 2910 } 2911 2912 static int addrconf_ifdown(struct net_device *dev, int how) 2913 { 2914 struct net *net = dev_net(dev); 2915 struct inet6_dev *idev; 2916 struct inet6_ifaddr *ifa; 2917 int state, i; 2918 2919 ASSERT_RTNL(); 2920 2921 rt6_ifdown(net, dev); 2922 neigh_ifdown(&nd_tbl, dev); 2923 2924 idev = __in6_dev_get(dev); 2925 if (idev == NULL) 2926 return -ENODEV; 2927 2928 /* 2929 * Step 1: remove reference to ipv6 device from parent device. 2930 * Do not dev_put! 2931 */ 2932 if (how) { 2933 idev->dead = 1; 2934 2935 /* protected by rtnl_lock */ 2936 RCU_INIT_POINTER(dev->ip6_ptr, NULL); 2937 2938 /* Step 1.5: remove snmp6 entry */ 2939 snmp6_unregister_dev(idev); 2940 2941 } 2942 2943 /* Step 2: clear hash table */ 2944 for (i = 0; i < IN6_ADDR_HSIZE; i++) { 2945 struct hlist_head *h = &inet6_addr_lst[i]; 2946 2947 spin_lock_bh(&addrconf_hash_lock); 2948 restart: 2949 hlist_for_each_entry_rcu(ifa, h, addr_lst) { 2950 if (ifa->idev == idev) { 2951 hlist_del_init_rcu(&ifa->addr_lst); 2952 addrconf_del_dad_timer(ifa); 2953 goto restart; 2954 } 2955 } 2956 spin_unlock_bh(&addrconf_hash_lock); 2957 } 2958 2959 write_lock_bh(&idev->lock); 2960 2961 addrconf_del_rs_timer(idev); 2962 2963 /* Step 2: clear flags for stateless addrconf */ 2964 if (!how) 2965 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY); 2966 2967 if (how && del_timer(&idev->regen_timer)) 2968 in6_dev_put(idev); 2969 2970 /* Step 3: clear tempaddr list */ 2971 while (!list_empty(&idev->tempaddr_list)) { 2972 ifa = list_first_entry(&idev->tempaddr_list, 2973 struct inet6_ifaddr, tmp_list); 2974 list_del(&ifa->tmp_list); 2975 write_unlock_bh(&idev->lock); 2976 spin_lock_bh(&ifa->lock); 2977 2978 if (ifa->ifpub) { 2979 in6_ifa_put(ifa->ifpub); 2980 ifa->ifpub = NULL; 2981 } 2982 spin_unlock_bh(&ifa->lock); 2983 in6_ifa_put(ifa); 2984 write_lock_bh(&idev->lock); 2985 } 2986 2987 while (!list_empty(&idev->addr_list)) { 2988 ifa = list_first_entry(&idev->addr_list, 2989 struct inet6_ifaddr, if_list); 2990 addrconf_del_dad_timer(ifa); 2991 2992 list_del(&ifa->if_list); 2993 2994 write_unlock_bh(&idev->lock); 2995 2996 spin_lock_bh(&ifa->state_lock); 2997 state = ifa->state; 2998 ifa->state = INET6_IFADDR_STATE_DEAD; 2999 spin_unlock_bh(&ifa->state_lock); 3000 3001 if (state != INET6_IFADDR_STATE_DEAD) { 3002 __ipv6_ifa_notify(RTM_DELADDR, ifa); 3003 inet6addr_notifier_call_chain(NETDEV_DOWN, ifa); 3004 } 3005 in6_ifa_put(ifa); 3006 3007 write_lock_bh(&idev->lock); 3008 } 3009 3010 write_unlock_bh(&idev->lock); 3011 3012 /* Step 5: Discard multicast list */ 3013 if (how) 3014 ipv6_mc_destroy_dev(idev); 3015 else 3016 ipv6_mc_down(idev); 3017 3018 idev->tstamp = jiffies; 3019 3020 /* Last: Shot the device (if unregistered) */ 3021 if (how) { 3022 addrconf_sysctl_unregister(idev); 3023 neigh_parms_release(&nd_tbl, idev->nd_parms); 3024 neigh_ifdown(&nd_tbl, dev); 3025 in6_dev_put(idev); 3026 } 3027 return 0; 3028 } 3029 3030 static void addrconf_rs_timer(unsigned long data) 3031 { 3032 struct inet6_dev *idev = (struct inet6_dev *)data; 3033 struct net_device *dev = idev->dev; 3034 struct in6_addr lladdr; 3035 3036 write_lock(&idev->lock); 3037 if (idev->dead || !(idev->if_flags & IF_READY)) 3038 goto out; 3039 3040 if (!ipv6_accept_ra(idev)) 3041 goto out; 3042 3043 /* Announcement received after solicitation was sent */ 3044 if (idev->if_flags & IF_RA_RCVD) 3045 goto out; 3046 3047 if (idev->rs_probes++ < idev->cnf.rtr_solicits) { 3048 write_unlock(&idev->lock); 3049 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE)) 3050 ndisc_send_rs(dev, &lladdr, 3051 &in6addr_linklocal_allrouters); 3052 else 3053 goto put; 3054 3055 write_lock(&idev->lock); 3056 /* The wait after the last probe can be shorter */ 3057 addrconf_mod_rs_timer(idev, (idev->rs_probes == 3058 idev->cnf.rtr_solicits) ? 3059 idev->cnf.rtr_solicit_delay : 3060 idev->cnf.rtr_solicit_interval); 3061 } else { 3062 /* 3063 * Note: we do not support deprecated "all on-link" 3064 * assumption any longer. 3065 */ 3066 pr_debug("%s: no IPv6 routers present\n", idev->dev->name); 3067 } 3068 3069 out: 3070 write_unlock(&idev->lock); 3071 put: 3072 in6_dev_put(idev); 3073 } 3074 3075 /* 3076 * Duplicate Address Detection 3077 */ 3078 static void addrconf_dad_kick(struct inet6_ifaddr *ifp) 3079 { 3080 unsigned long rand_num; 3081 struct inet6_dev *idev = ifp->idev; 3082 3083 if (ifp->flags & IFA_F_OPTIMISTIC) 3084 rand_num = 0; 3085 else 3086 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1); 3087 3088 ifp->dad_probes = idev->cnf.dad_transmits; 3089 addrconf_mod_dad_timer(ifp, rand_num); 3090 } 3091 3092 static void addrconf_dad_start(struct inet6_ifaddr *ifp) 3093 { 3094 struct inet6_dev *idev = ifp->idev; 3095 struct net_device *dev = idev->dev; 3096 3097 addrconf_join_solict(dev, &ifp->addr); 3098 3099 net_srandom(ifp->addr.s6_addr32[3]); 3100 3101 read_lock_bh(&idev->lock); 3102 spin_lock(&ifp->lock); 3103 if (ifp->state == INET6_IFADDR_STATE_DEAD) 3104 goto out; 3105 3106 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) || 3107 idev->cnf.accept_dad < 1 || 3108 !(ifp->flags&IFA_F_TENTATIVE) || 3109 ifp->flags & IFA_F_NODAD) { 3110 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED); 3111 spin_unlock(&ifp->lock); 3112 read_unlock_bh(&idev->lock); 3113 3114 addrconf_dad_completed(ifp); 3115 return; 3116 } 3117 3118 if (!(idev->if_flags & IF_READY)) { 3119 spin_unlock(&ifp->lock); 3120 read_unlock_bh(&idev->lock); 3121 /* 3122 * If the device is not ready: 3123 * - keep it tentative if it is a permanent address. 3124 * - otherwise, kill it. 3125 */ 3126 in6_ifa_hold(ifp); 3127 addrconf_dad_stop(ifp, 0); 3128 return; 3129 } 3130 3131 /* 3132 * Optimistic nodes can start receiving 3133 * Frames right away 3134 */ 3135 if (ifp->flags & IFA_F_OPTIMISTIC) 3136 ip6_ins_rt(ifp->rt); 3137 3138 addrconf_dad_kick(ifp); 3139 out: 3140 spin_unlock(&ifp->lock); 3141 read_unlock_bh(&idev->lock); 3142 } 3143 3144 static void addrconf_dad_timer(unsigned long data) 3145 { 3146 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data; 3147 struct inet6_dev *idev = ifp->idev; 3148 struct in6_addr mcaddr; 3149 3150 if (!ifp->dad_probes && addrconf_dad_end(ifp)) 3151 goto out; 3152 3153 write_lock(&idev->lock); 3154 if (idev->dead || !(idev->if_flags & IF_READY)) { 3155 write_unlock(&idev->lock); 3156 goto out; 3157 } 3158 3159 spin_lock(&ifp->lock); 3160 if (ifp->state == INET6_IFADDR_STATE_DEAD) { 3161 spin_unlock(&ifp->lock); 3162 write_unlock(&idev->lock); 3163 goto out; 3164 } 3165 3166 if (ifp->dad_probes == 0) { 3167 /* 3168 * DAD was successful 3169 */ 3170 3171 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED); 3172 spin_unlock(&ifp->lock); 3173 write_unlock(&idev->lock); 3174 3175 addrconf_dad_completed(ifp); 3176 3177 goto out; 3178 } 3179 3180 ifp->dad_probes--; 3181 addrconf_mod_dad_timer(ifp, ifp->idev->nd_parms->retrans_time); 3182 spin_unlock(&ifp->lock); 3183 write_unlock(&idev->lock); 3184 3185 /* send a neighbour solicitation for our addr */ 3186 addrconf_addr_solict_mult(&ifp->addr, &mcaddr); 3187 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &in6addr_any); 3188 out: 3189 in6_ifa_put(ifp); 3190 } 3191 3192 static void addrconf_dad_completed(struct inet6_ifaddr *ifp) 3193 { 3194 struct net_device *dev = ifp->idev->dev; 3195 struct in6_addr lladdr; 3196 bool send_rs, send_mld; 3197 3198 addrconf_del_dad_timer(ifp); 3199 3200 /* 3201 * Configure the address for reception. Now it is valid. 3202 */ 3203 3204 ipv6_ifa_notify(RTM_NEWADDR, ifp); 3205 3206 /* If added prefix is link local and we are prepared to process 3207 router advertisements, start sending router solicitations. 3208 */ 3209 3210 read_lock_bh(&ifp->idev->lock); 3211 spin_lock(&ifp->lock); 3212 send_mld = ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL && 3213 ifp->idev->valid_ll_addr_cnt == 1; 3214 send_rs = send_mld && 3215 ipv6_accept_ra(ifp->idev) && 3216 ifp->idev->cnf.rtr_solicits > 0 && 3217 (dev->flags&IFF_LOOPBACK) == 0; 3218 spin_unlock(&ifp->lock); 3219 read_unlock_bh(&ifp->idev->lock); 3220 3221 /* While dad is in progress mld report's source address is in6_addrany. 3222 * Resend with proper ll now. 3223 */ 3224 if (send_mld) 3225 ipv6_mc_dad_complete(ifp->idev); 3226 3227 if (send_rs) { 3228 /* 3229 * If a host as already performed a random delay 3230 * [...] as part of DAD [...] there is no need 3231 * to delay again before sending the first RS 3232 */ 3233 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE)) 3234 return; 3235 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters); 3236 3237 write_lock_bh(&ifp->idev->lock); 3238 spin_lock(&ifp->lock); 3239 ifp->idev->rs_probes = 1; 3240 ifp->idev->if_flags |= IF_RS_SENT; 3241 addrconf_mod_rs_timer(ifp->idev, 3242 ifp->idev->cnf.rtr_solicit_interval); 3243 spin_unlock(&ifp->lock); 3244 write_unlock_bh(&ifp->idev->lock); 3245 } 3246 } 3247 3248 static void addrconf_dad_run(struct inet6_dev *idev) 3249 { 3250 struct inet6_ifaddr *ifp; 3251 3252 read_lock_bh(&idev->lock); 3253 list_for_each_entry(ifp, &idev->addr_list, if_list) { 3254 spin_lock(&ifp->lock); 3255 if (ifp->flags & IFA_F_TENTATIVE && 3256 ifp->state == INET6_IFADDR_STATE_DAD) 3257 addrconf_dad_kick(ifp); 3258 spin_unlock(&ifp->lock); 3259 } 3260 read_unlock_bh(&idev->lock); 3261 } 3262 3263 #ifdef CONFIG_PROC_FS 3264 struct if6_iter_state { 3265 struct seq_net_private p; 3266 int bucket; 3267 int offset; 3268 }; 3269 3270 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos) 3271 { 3272 struct inet6_ifaddr *ifa = NULL; 3273 struct if6_iter_state *state = seq->private; 3274 struct net *net = seq_file_net(seq); 3275 int p = 0; 3276 3277 /* initial bucket if pos is 0 */ 3278 if (pos == 0) { 3279 state->bucket = 0; 3280 state->offset = 0; 3281 } 3282 3283 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) { 3284 hlist_for_each_entry_rcu_bh(ifa, &inet6_addr_lst[state->bucket], 3285 addr_lst) { 3286 if (!net_eq(dev_net(ifa->idev->dev), net)) 3287 continue; 3288 /* sync with offset */ 3289 if (p < state->offset) { 3290 p++; 3291 continue; 3292 } 3293 state->offset++; 3294 return ifa; 3295 } 3296 3297 /* prepare for next bucket */ 3298 state->offset = 0; 3299 p = 0; 3300 } 3301 return NULL; 3302 } 3303 3304 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, 3305 struct inet6_ifaddr *ifa) 3306 { 3307 struct if6_iter_state *state = seq->private; 3308 struct net *net = seq_file_net(seq); 3309 3310 hlist_for_each_entry_continue_rcu_bh(ifa, addr_lst) { 3311 if (!net_eq(dev_net(ifa->idev->dev), net)) 3312 continue; 3313 state->offset++; 3314 return ifa; 3315 } 3316 3317 while (++state->bucket < IN6_ADDR_HSIZE) { 3318 state->offset = 0; 3319 hlist_for_each_entry_rcu_bh(ifa, 3320 &inet6_addr_lst[state->bucket], addr_lst) { 3321 if (!net_eq(dev_net(ifa->idev->dev), net)) 3322 continue; 3323 state->offset++; 3324 return ifa; 3325 } 3326 } 3327 3328 return NULL; 3329 } 3330 3331 static void *if6_seq_start(struct seq_file *seq, loff_t *pos) 3332 __acquires(rcu_bh) 3333 { 3334 rcu_read_lock_bh(); 3335 return if6_get_first(seq, *pos); 3336 } 3337 3338 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos) 3339 { 3340 struct inet6_ifaddr *ifa; 3341 3342 ifa = if6_get_next(seq, v); 3343 ++*pos; 3344 return ifa; 3345 } 3346 3347 static void if6_seq_stop(struct seq_file *seq, void *v) 3348 __releases(rcu_bh) 3349 { 3350 rcu_read_unlock_bh(); 3351 } 3352 3353 static int if6_seq_show(struct seq_file *seq, void *v) 3354 { 3355 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v; 3356 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n", 3357 &ifp->addr, 3358 ifp->idev->dev->ifindex, 3359 ifp->prefix_len, 3360 ifp->scope, 3361 ifp->flags, 3362 ifp->idev->dev->name); 3363 return 0; 3364 } 3365 3366 static const struct seq_operations if6_seq_ops = { 3367 .start = if6_seq_start, 3368 .next = if6_seq_next, 3369 .show = if6_seq_show, 3370 .stop = if6_seq_stop, 3371 }; 3372 3373 static int if6_seq_open(struct inode *inode, struct file *file) 3374 { 3375 return seq_open_net(inode, file, &if6_seq_ops, 3376 sizeof(struct if6_iter_state)); 3377 } 3378 3379 static const struct file_operations if6_fops = { 3380 .owner = THIS_MODULE, 3381 .open = if6_seq_open, 3382 .read = seq_read, 3383 .llseek = seq_lseek, 3384 .release = seq_release_net, 3385 }; 3386 3387 static int __net_init if6_proc_net_init(struct net *net) 3388 { 3389 if (!proc_create("if_inet6", S_IRUGO, net->proc_net, &if6_fops)) 3390 return -ENOMEM; 3391 return 0; 3392 } 3393 3394 static void __net_exit if6_proc_net_exit(struct net *net) 3395 { 3396 remove_proc_entry("if_inet6", net->proc_net); 3397 } 3398 3399 static struct pernet_operations if6_proc_net_ops = { 3400 .init = if6_proc_net_init, 3401 .exit = if6_proc_net_exit, 3402 }; 3403 3404 int __init if6_proc_init(void) 3405 { 3406 return register_pernet_subsys(&if6_proc_net_ops); 3407 } 3408 3409 void if6_proc_exit(void) 3410 { 3411 unregister_pernet_subsys(&if6_proc_net_ops); 3412 } 3413 #endif /* CONFIG_PROC_FS */ 3414 3415 #if IS_ENABLED(CONFIG_IPV6_MIP6) 3416 /* Check if address is a home address configured on any interface. */ 3417 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr) 3418 { 3419 int ret = 0; 3420 struct inet6_ifaddr *ifp = NULL; 3421 unsigned int hash = inet6_addr_hash(addr); 3422 3423 rcu_read_lock_bh(); 3424 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) { 3425 if (!net_eq(dev_net(ifp->idev->dev), net)) 3426 continue; 3427 if (ipv6_addr_equal(&ifp->addr, addr) && 3428 (ifp->flags & IFA_F_HOMEADDRESS)) { 3429 ret = 1; 3430 break; 3431 } 3432 } 3433 rcu_read_unlock_bh(); 3434 return ret; 3435 } 3436 #endif 3437 3438 /* 3439 * Periodic address status verification 3440 */ 3441 3442 static void addrconf_verify(unsigned long foo) 3443 { 3444 unsigned long now, next, next_sec, next_sched; 3445 struct inet6_ifaddr *ifp; 3446 int i; 3447 3448 rcu_read_lock_bh(); 3449 spin_lock(&addrconf_verify_lock); 3450 now = jiffies; 3451 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY); 3452 3453 del_timer(&addr_chk_timer); 3454 3455 for (i = 0; i < IN6_ADDR_HSIZE; i++) { 3456 restart: 3457 hlist_for_each_entry_rcu_bh(ifp, 3458 &inet6_addr_lst[i], addr_lst) { 3459 unsigned long age; 3460 3461 /* When setting preferred_lft to a value not zero or 3462 * infinity, while valid_lft is infinity 3463 * IFA_F_PERMANENT has a non-infinity life time. 3464 */ 3465 if ((ifp->flags & IFA_F_PERMANENT) && 3466 (ifp->prefered_lft == INFINITY_LIFE_TIME)) 3467 continue; 3468 3469 spin_lock(&ifp->lock); 3470 /* We try to batch several events at once. */ 3471 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ; 3472 3473 if (ifp->valid_lft != INFINITY_LIFE_TIME && 3474 age >= ifp->valid_lft) { 3475 spin_unlock(&ifp->lock); 3476 in6_ifa_hold(ifp); 3477 ipv6_del_addr(ifp); 3478 goto restart; 3479 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) { 3480 spin_unlock(&ifp->lock); 3481 continue; 3482 } else if (age >= ifp->prefered_lft) { 3483 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */ 3484 int deprecate = 0; 3485 3486 if (!(ifp->flags&IFA_F_DEPRECATED)) { 3487 deprecate = 1; 3488 ifp->flags |= IFA_F_DEPRECATED; 3489 } 3490 3491 if ((ifp->valid_lft != INFINITY_LIFE_TIME) && 3492 (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))) 3493 next = ifp->tstamp + ifp->valid_lft * HZ; 3494 3495 spin_unlock(&ifp->lock); 3496 3497 if (deprecate) { 3498 in6_ifa_hold(ifp); 3499 3500 ipv6_ifa_notify(0, ifp); 3501 in6_ifa_put(ifp); 3502 goto restart; 3503 } 3504 } else if ((ifp->flags&IFA_F_TEMPORARY) && 3505 !(ifp->flags&IFA_F_TENTATIVE)) { 3506 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry * 3507 ifp->idev->cnf.dad_transmits * 3508 ifp->idev->nd_parms->retrans_time / HZ; 3509 3510 if (age >= ifp->prefered_lft - regen_advance) { 3511 struct inet6_ifaddr *ifpub = ifp->ifpub; 3512 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 3513 next = ifp->tstamp + ifp->prefered_lft * HZ; 3514 if (!ifp->regen_count && ifpub) { 3515 ifp->regen_count++; 3516 in6_ifa_hold(ifp); 3517 in6_ifa_hold(ifpub); 3518 spin_unlock(&ifp->lock); 3519 3520 spin_lock(&ifpub->lock); 3521 ifpub->regen_count = 0; 3522 spin_unlock(&ifpub->lock); 3523 ipv6_create_tempaddr(ifpub, ifp); 3524 in6_ifa_put(ifpub); 3525 in6_ifa_put(ifp); 3526 goto restart; 3527 } 3528 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next)) 3529 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ; 3530 spin_unlock(&ifp->lock); 3531 } else { 3532 /* ifp->prefered_lft <= ifp->valid_lft */ 3533 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 3534 next = ifp->tstamp + ifp->prefered_lft * HZ; 3535 spin_unlock(&ifp->lock); 3536 } 3537 } 3538 } 3539 3540 next_sec = round_jiffies_up(next); 3541 next_sched = next; 3542 3543 /* If rounded timeout is accurate enough, accept it. */ 3544 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ)) 3545 next_sched = next_sec; 3546 3547 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */ 3548 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX)) 3549 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX; 3550 3551 ADBG(KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n", 3552 now, next, next_sec, next_sched); 3553 3554 addr_chk_timer.expires = next_sched; 3555 add_timer(&addr_chk_timer); 3556 spin_unlock(&addrconf_verify_lock); 3557 rcu_read_unlock_bh(); 3558 } 3559 3560 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local, 3561 struct in6_addr **peer_pfx) 3562 { 3563 struct in6_addr *pfx = NULL; 3564 3565 *peer_pfx = NULL; 3566 3567 if (addr) 3568 pfx = nla_data(addr); 3569 3570 if (local) { 3571 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx))) 3572 *peer_pfx = pfx; 3573 pfx = nla_data(local); 3574 } 3575 3576 return pfx; 3577 } 3578 3579 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = { 3580 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) }, 3581 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) }, 3582 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) }, 3583 }; 3584 3585 static int 3586 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh) 3587 { 3588 struct net *net = sock_net(skb->sk); 3589 struct ifaddrmsg *ifm; 3590 struct nlattr *tb[IFA_MAX+1]; 3591 struct in6_addr *pfx, *peer_pfx; 3592 int err; 3593 3594 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy); 3595 if (err < 0) 3596 return err; 3597 3598 ifm = nlmsg_data(nlh); 3599 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx); 3600 if (pfx == NULL) 3601 return -EINVAL; 3602 3603 return inet6_addr_del(net, ifm->ifa_index, pfx, ifm->ifa_prefixlen); 3604 } 3605 3606 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags, 3607 u32 prefered_lft, u32 valid_lft) 3608 { 3609 u32 flags; 3610 clock_t expires; 3611 unsigned long timeout; 3612 3613 if (!valid_lft || (prefered_lft > valid_lft)) 3614 return -EINVAL; 3615 3616 timeout = addrconf_timeout_fixup(valid_lft, HZ); 3617 if (addrconf_finite_timeout(timeout)) { 3618 expires = jiffies_to_clock_t(timeout * HZ); 3619 valid_lft = timeout; 3620 flags = RTF_EXPIRES; 3621 } else { 3622 expires = 0; 3623 flags = 0; 3624 ifa_flags |= IFA_F_PERMANENT; 3625 } 3626 3627 timeout = addrconf_timeout_fixup(prefered_lft, HZ); 3628 if (addrconf_finite_timeout(timeout)) { 3629 if (timeout == 0) 3630 ifa_flags |= IFA_F_DEPRECATED; 3631 prefered_lft = timeout; 3632 } 3633 3634 spin_lock_bh(&ifp->lock); 3635 ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags; 3636 ifp->tstamp = jiffies; 3637 ifp->valid_lft = valid_lft; 3638 ifp->prefered_lft = prefered_lft; 3639 3640 spin_unlock_bh(&ifp->lock); 3641 if (!(ifp->flags&IFA_F_TENTATIVE)) 3642 ipv6_ifa_notify(0, ifp); 3643 3644 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev, 3645 expires, flags); 3646 addrconf_verify(0); 3647 3648 return 0; 3649 } 3650 3651 static int 3652 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh) 3653 { 3654 struct net *net = sock_net(skb->sk); 3655 struct ifaddrmsg *ifm; 3656 struct nlattr *tb[IFA_MAX+1]; 3657 struct in6_addr *pfx, *peer_pfx; 3658 struct inet6_ifaddr *ifa; 3659 struct net_device *dev; 3660 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME; 3661 u8 ifa_flags; 3662 int err; 3663 3664 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy); 3665 if (err < 0) 3666 return err; 3667 3668 ifm = nlmsg_data(nlh); 3669 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx); 3670 if (pfx == NULL) 3671 return -EINVAL; 3672 3673 if (tb[IFA_CACHEINFO]) { 3674 struct ifa_cacheinfo *ci; 3675 3676 ci = nla_data(tb[IFA_CACHEINFO]); 3677 valid_lft = ci->ifa_valid; 3678 preferred_lft = ci->ifa_prefered; 3679 } else { 3680 preferred_lft = INFINITY_LIFE_TIME; 3681 valid_lft = INFINITY_LIFE_TIME; 3682 } 3683 3684 dev = __dev_get_by_index(net, ifm->ifa_index); 3685 if (dev == NULL) 3686 return -ENODEV; 3687 3688 /* We ignore other flags so far. */ 3689 ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS); 3690 3691 ifa = ipv6_get_ifaddr(net, pfx, dev, 1); 3692 if (ifa == NULL) { 3693 /* 3694 * It would be best to check for !NLM_F_CREATE here but 3695 * userspace alreay relies on not having to provide this. 3696 */ 3697 return inet6_addr_add(net, ifm->ifa_index, pfx, peer_pfx, 3698 ifm->ifa_prefixlen, ifa_flags, 3699 preferred_lft, valid_lft); 3700 } 3701 3702 if (nlh->nlmsg_flags & NLM_F_EXCL || 3703 !(nlh->nlmsg_flags & NLM_F_REPLACE)) 3704 err = -EEXIST; 3705 else 3706 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft); 3707 3708 in6_ifa_put(ifa); 3709 3710 return err; 3711 } 3712 3713 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags, 3714 u8 scope, int ifindex) 3715 { 3716 struct ifaddrmsg *ifm; 3717 3718 ifm = nlmsg_data(nlh); 3719 ifm->ifa_family = AF_INET6; 3720 ifm->ifa_prefixlen = prefixlen; 3721 ifm->ifa_flags = flags; 3722 ifm->ifa_scope = scope; 3723 ifm->ifa_index = ifindex; 3724 } 3725 3726 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp, 3727 unsigned long tstamp, u32 preferred, u32 valid) 3728 { 3729 struct ifa_cacheinfo ci; 3730 3731 ci.cstamp = cstamp_delta(cstamp); 3732 ci.tstamp = cstamp_delta(tstamp); 3733 ci.ifa_prefered = preferred; 3734 ci.ifa_valid = valid; 3735 3736 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci); 3737 } 3738 3739 static inline int rt_scope(int ifa_scope) 3740 { 3741 if (ifa_scope & IFA_HOST) 3742 return RT_SCOPE_HOST; 3743 else if (ifa_scope & IFA_LINK) 3744 return RT_SCOPE_LINK; 3745 else if (ifa_scope & IFA_SITE) 3746 return RT_SCOPE_SITE; 3747 else 3748 return RT_SCOPE_UNIVERSE; 3749 } 3750 3751 static inline int inet6_ifaddr_msgsize(void) 3752 { 3753 return NLMSG_ALIGN(sizeof(struct ifaddrmsg)) 3754 + nla_total_size(16) /* IFA_LOCAL */ 3755 + nla_total_size(16) /* IFA_ADDRESS */ 3756 + nla_total_size(sizeof(struct ifa_cacheinfo)); 3757 } 3758 3759 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa, 3760 u32 portid, u32 seq, int event, unsigned int flags) 3761 { 3762 struct nlmsghdr *nlh; 3763 u32 preferred, valid; 3764 3765 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags); 3766 if (nlh == NULL) 3767 return -EMSGSIZE; 3768 3769 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope), 3770 ifa->idev->dev->ifindex); 3771 3772 if (!((ifa->flags&IFA_F_PERMANENT) && 3773 (ifa->prefered_lft == INFINITY_LIFE_TIME))) { 3774 preferred = ifa->prefered_lft; 3775 valid = ifa->valid_lft; 3776 if (preferred != INFINITY_LIFE_TIME) { 3777 long tval = (jiffies - ifa->tstamp)/HZ; 3778 if (preferred > tval) 3779 preferred -= tval; 3780 else 3781 preferred = 0; 3782 if (valid != INFINITY_LIFE_TIME) { 3783 if (valid > tval) 3784 valid -= tval; 3785 else 3786 valid = 0; 3787 } 3788 } 3789 } else { 3790 preferred = INFINITY_LIFE_TIME; 3791 valid = INFINITY_LIFE_TIME; 3792 } 3793 3794 if (!ipv6_addr_any(&ifa->peer_addr)) { 3795 if (nla_put(skb, IFA_LOCAL, 16, &ifa->addr) < 0 || 3796 nla_put(skb, IFA_ADDRESS, 16, &ifa->peer_addr) < 0) 3797 goto error; 3798 } else 3799 if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0) 3800 goto error; 3801 3802 if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) 3803 goto error; 3804 3805 return nlmsg_end(skb, nlh); 3806 3807 error: 3808 nlmsg_cancel(skb, nlh); 3809 return -EMSGSIZE; 3810 } 3811 3812 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca, 3813 u32 portid, u32 seq, int event, u16 flags) 3814 { 3815 struct nlmsghdr *nlh; 3816 u8 scope = RT_SCOPE_UNIVERSE; 3817 int ifindex = ifmca->idev->dev->ifindex; 3818 3819 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE) 3820 scope = RT_SCOPE_SITE; 3821 3822 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags); 3823 if (nlh == NULL) 3824 return -EMSGSIZE; 3825 3826 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 3827 if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 || 3828 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp, 3829 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 3830 nlmsg_cancel(skb, nlh); 3831 return -EMSGSIZE; 3832 } 3833 3834 return nlmsg_end(skb, nlh); 3835 } 3836 3837 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca, 3838 u32 portid, u32 seq, int event, unsigned int flags) 3839 { 3840 struct nlmsghdr *nlh; 3841 u8 scope = RT_SCOPE_UNIVERSE; 3842 int ifindex = ifaca->aca_idev->dev->ifindex; 3843 3844 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE) 3845 scope = RT_SCOPE_SITE; 3846 3847 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags); 3848 if (nlh == NULL) 3849 return -EMSGSIZE; 3850 3851 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 3852 if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 || 3853 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp, 3854 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 3855 nlmsg_cancel(skb, nlh); 3856 return -EMSGSIZE; 3857 } 3858 3859 return nlmsg_end(skb, nlh); 3860 } 3861 3862 enum addr_type_t { 3863 UNICAST_ADDR, 3864 MULTICAST_ADDR, 3865 ANYCAST_ADDR, 3866 }; 3867 3868 /* called with rcu_read_lock() */ 3869 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb, 3870 struct netlink_callback *cb, enum addr_type_t type, 3871 int s_ip_idx, int *p_ip_idx) 3872 { 3873 struct ifmcaddr6 *ifmca; 3874 struct ifacaddr6 *ifaca; 3875 int err = 1; 3876 int ip_idx = *p_ip_idx; 3877 3878 read_lock_bh(&idev->lock); 3879 switch (type) { 3880 case UNICAST_ADDR: { 3881 struct inet6_ifaddr *ifa; 3882 3883 /* unicast address incl. temp addr */ 3884 list_for_each_entry(ifa, &idev->addr_list, if_list) { 3885 if (++ip_idx < s_ip_idx) 3886 continue; 3887 err = inet6_fill_ifaddr(skb, ifa, 3888 NETLINK_CB(cb->skb).portid, 3889 cb->nlh->nlmsg_seq, 3890 RTM_NEWADDR, 3891 NLM_F_MULTI); 3892 if (err <= 0) 3893 break; 3894 nl_dump_check_consistent(cb, nlmsg_hdr(skb)); 3895 } 3896 break; 3897 } 3898 case MULTICAST_ADDR: 3899 /* multicast address */ 3900 for (ifmca = idev->mc_list; ifmca; 3901 ifmca = ifmca->next, ip_idx++) { 3902 if (ip_idx < s_ip_idx) 3903 continue; 3904 err = inet6_fill_ifmcaddr(skb, ifmca, 3905 NETLINK_CB(cb->skb).portid, 3906 cb->nlh->nlmsg_seq, 3907 RTM_GETMULTICAST, 3908 NLM_F_MULTI); 3909 if (err <= 0) 3910 break; 3911 } 3912 break; 3913 case ANYCAST_ADDR: 3914 /* anycast address */ 3915 for (ifaca = idev->ac_list; ifaca; 3916 ifaca = ifaca->aca_next, ip_idx++) { 3917 if (ip_idx < s_ip_idx) 3918 continue; 3919 err = inet6_fill_ifacaddr(skb, ifaca, 3920 NETLINK_CB(cb->skb).portid, 3921 cb->nlh->nlmsg_seq, 3922 RTM_GETANYCAST, 3923 NLM_F_MULTI); 3924 if (err <= 0) 3925 break; 3926 } 3927 break; 3928 default: 3929 break; 3930 } 3931 read_unlock_bh(&idev->lock); 3932 *p_ip_idx = ip_idx; 3933 return err; 3934 } 3935 3936 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb, 3937 enum addr_type_t type) 3938 { 3939 struct net *net = sock_net(skb->sk); 3940 int h, s_h; 3941 int idx, ip_idx; 3942 int s_idx, s_ip_idx; 3943 struct net_device *dev; 3944 struct inet6_dev *idev; 3945 struct hlist_head *head; 3946 3947 s_h = cb->args[0]; 3948 s_idx = idx = cb->args[1]; 3949 s_ip_idx = ip_idx = cb->args[2]; 3950 3951 rcu_read_lock(); 3952 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ net->dev_base_seq; 3953 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 3954 idx = 0; 3955 head = &net->dev_index_head[h]; 3956 hlist_for_each_entry_rcu(dev, head, index_hlist) { 3957 if (idx < s_idx) 3958 goto cont; 3959 if (h > s_h || idx > s_idx) 3960 s_ip_idx = 0; 3961 ip_idx = 0; 3962 idev = __in6_dev_get(dev); 3963 if (!idev) 3964 goto cont; 3965 3966 if (in6_dump_addrs(idev, skb, cb, type, 3967 s_ip_idx, &ip_idx) <= 0) 3968 goto done; 3969 cont: 3970 idx++; 3971 } 3972 } 3973 done: 3974 rcu_read_unlock(); 3975 cb->args[0] = h; 3976 cb->args[1] = idx; 3977 cb->args[2] = ip_idx; 3978 3979 return skb->len; 3980 } 3981 3982 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb) 3983 { 3984 enum addr_type_t type = UNICAST_ADDR; 3985 3986 return inet6_dump_addr(skb, cb, type); 3987 } 3988 3989 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb) 3990 { 3991 enum addr_type_t type = MULTICAST_ADDR; 3992 3993 return inet6_dump_addr(skb, cb, type); 3994 } 3995 3996 3997 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb) 3998 { 3999 enum addr_type_t type = ANYCAST_ADDR; 4000 4001 return inet6_dump_addr(skb, cb, type); 4002 } 4003 4004 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh) 4005 { 4006 struct net *net = sock_net(in_skb->sk); 4007 struct ifaddrmsg *ifm; 4008 struct nlattr *tb[IFA_MAX+1]; 4009 struct in6_addr *addr = NULL, *peer; 4010 struct net_device *dev = NULL; 4011 struct inet6_ifaddr *ifa; 4012 struct sk_buff *skb; 4013 int err; 4014 4015 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy); 4016 if (err < 0) 4017 goto errout; 4018 4019 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer); 4020 if (addr == NULL) { 4021 err = -EINVAL; 4022 goto errout; 4023 } 4024 4025 ifm = nlmsg_data(nlh); 4026 if (ifm->ifa_index) 4027 dev = __dev_get_by_index(net, ifm->ifa_index); 4028 4029 ifa = ipv6_get_ifaddr(net, addr, dev, 1); 4030 if (!ifa) { 4031 err = -EADDRNOTAVAIL; 4032 goto errout; 4033 } 4034 4035 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL); 4036 if (!skb) { 4037 err = -ENOBUFS; 4038 goto errout_ifa; 4039 } 4040 4041 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).portid, 4042 nlh->nlmsg_seq, RTM_NEWADDR, 0); 4043 if (err < 0) { 4044 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 4045 WARN_ON(err == -EMSGSIZE); 4046 kfree_skb(skb); 4047 goto errout_ifa; 4048 } 4049 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid); 4050 errout_ifa: 4051 in6_ifa_put(ifa); 4052 errout: 4053 return err; 4054 } 4055 4056 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa) 4057 { 4058 struct sk_buff *skb; 4059 struct net *net = dev_net(ifa->idev->dev); 4060 int err = -ENOBUFS; 4061 4062 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC); 4063 if (skb == NULL) 4064 goto errout; 4065 4066 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0); 4067 if (err < 0) { 4068 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 4069 WARN_ON(err == -EMSGSIZE); 4070 kfree_skb(skb); 4071 goto errout; 4072 } 4073 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC); 4074 return; 4075 errout: 4076 if (err < 0) 4077 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err); 4078 } 4079 4080 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf, 4081 __s32 *array, int bytes) 4082 { 4083 BUG_ON(bytes < (DEVCONF_MAX * 4)); 4084 4085 memset(array, 0, bytes); 4086 array[DEVCONF_FORWARDING] = cnf->forwarding; 4087 array[DEVCONF_HOPLIMIT] = cnf->hop_limit; 4088 array[DEVCONF_MTU6] = cnf->mtu6; 4089 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra; 4090 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects; 4091 array[DEVCONF_AUTOCONF] = cnf->autoconf; 4092 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits; 4093 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits; 4094 array[DEVCONF_RTR_SOLICIT_INTERVAL] = 4095 jiffies_to_msecs(cnf->rtr_solicit_interval); 4096 array[DEVCONF_RTR_SOLICIT_DELAY] = 4097 jiffies_to_msecs(cnf->rtr_solicit_delay); 4098 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version; 4099 array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] = 4100 jiffies_to_msecs(cnf->mldv1_unsolicited_report_interval); 4101 array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] = 4102 jiffies_to_msecs(cnf->mldv2_unsolicited_report_interval); 4103 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr; 4104 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft; 4105 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft; 4106 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry; 4107 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor; 4108 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses; 4109 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr; 4110 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo; 4111 #ifdef CONFIG_IPV6_ROUTER_PREF 4112 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref; 4113 array[DEVCONF_RTR_PROBE_INTERVAL] = 4114 jiffies_to_msecs(cnf->rtr_probe_interval); 4115 #ifdef CONFIG_IPV6_ROUTE_INFO 4116 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen; 4117 #endif 4118 #endif 4119 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp; 4120 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route; 4121 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 4122 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad; 4123 #endif 4124 #ifdef CONFIG_IPV6_MROUTE 4125 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding; 4126 #endif 4127 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6; 4128 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad; 4129 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao; 4130 array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify; 4131 array[DEVCONF_SUPPRESS_FRAG_NDISC] = cnf->suppress_frag_ndisc; 4132 } 4133 4134 static inline size_t inet6_ifla6_size(void) 4135 { 4136 return nla_total_size(4) /* IFLA_INET6_FLAGS */ 4137 + nla_total_size(sizeof(struct ifla_cacheinfo)) 4138 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */ 4139 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */ 4140 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */ 4141 + nla_total_size(sizeof(struct in6_addr)); /* IFLA_INET6_TOKEN */ 4142 } 4143 4144 static inline size_t inet6_if_nlmsg_size(void) 4145 { 4146 return NLMSG_ALIGN(sizeof(struct ifinfomsg)) 4147 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */ 4148 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */ 4149 + nla_total_size(4) /* IFLA_MTU */ 4150 + nla_total_size(4) /* IFLA_LINK */ 4151 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */ 4152 } 4153 4154 static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib, 4155 int items, int bytes) 4156 { 4157 int i; 4158 int pad = bytes - sizeof(u64) * items; 4159 BUG_ON(pad < 0); 4160 4161 /* Use put_unaligned() because stats may not be aligned for u64. */ 4162 put_unaligned(items, &stats[0]); 4163 for (i = 1; i < items; i++) 4164 put_unaligned(atomic_long_read(&mib[i]), &stats[i]); 4165 4166 memset(&stats[items], 0, pad); 4167 } 4168 4169 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu **mib, 4170 int items, int bytes, size_t syncpoff) 4171 { 4172 int i; 4173 int pad = bytes - sizeof(u64) * items; 4174 BUG_ON(pad < 0); 4175 4176 /* Use put_unaligned() because stats may not be aligned for u64. */ 4177 put_unaligned(items, &stats[0]); 4178 for (i = 1; i < items; i++) 4179 put_unaligned(snmp_fold_field64(mib, i, syncpoff), &stats[i]); 4180 4181 memset(&stats[items], 0, pad); 4182 } 4183 4184 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype, 4185 int bytes) 4186 { 4187 switch (attrtype) { 4188 case IFLA_INET6_STATS: 4189 __snmp6_fill_stats64(stats, (void __percpu **)idev->stats.ipv6, 4190 IPSTATS_MIB_MAX, bytes, offsetof(struct ipstats_mib, syncp)); 4191 break; 4192 case IFLA_INET6_ICMP6STATS: 4193 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, ICMP6_MIB_MAX, bytes); 4194 break; 4195 } 4196 } 4197 4198 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev) 4199 { 4200 struct nlattr *nla; 4201 struct ifla_cacheinfo ci; 4202 4203 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags)) 4204 goto nla_put_failure; 4205 ci.max_reasm_len = IPV6_MAXPLEN; 4206 ci.tstamp = cstamp_delta(idev->tstamp); 4207 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time); 4208 ci.retrans_time = jiffies_to_msecs(idev->nd_parms->retrans_time); 4209 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci)) 4210 goto nla_put_failure; 4211 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32)); 4212 if (nla == NULL) 4213 goto nla_put_failure; 4214 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla)); 4215 4216 /* XXX - MC not implemented */ 4217 4218 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64)); 4219 if (nla == NULL) 4220 goto nla_put_failure; 4221 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla)); 4222 4223 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64)); 4224 if (nla == NULL) 4225 goto nla_put_failure; 4226 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla)); 4227 4228 nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr)); 4229 if (nla == NULL) 4230 goto nla_put_failure; 4231 read_lock_bh(&idev->lock); 4232 memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla)); 4233 read_unlock_bh(&idev->lock); 4234 4235 return 0; 4236 4237 nla_put_failure: 4238 return -EMSGSIZE; 4239 } 4240 4241 static size_t inet6_get_link_af_size(const struct net_device *dev) 4242 { 4243 if (!__in6_dev_get(dev)) 4244 return 0; 4245 4246 return inet6_ifla6_size(); 4247 } 4248 4249 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev) 4250 { 4251 struct inet6_dev *idev = __in6_dev_get(dev); 4252 4253 if (!idev) 4254 return -ENODATA; 4255 4256 if (inet6_fill_ifla6_attrs(skb, idev) < 0) 4257 return -EMSGSIZE; 4258 4259 return 0; 4260 } 4261 4262 static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token) 4263 { 4264 struct inet6_ifaddr *ifp; 4265 struct net_device *dev = idev->dev; 4266 bool update_rs = false; 4267 struct in6_addr ll_addr; 4268 4269 if (token == NULL) 4270 return -EINVAL; 4271 if (ipv6_addr_any(token)) 4272 return -EINVAL; 4273 if (dev->flags & (IFF_LOOPBACK | IFF_NOARP)) 4274 return -EINVAL; 4275 if (!ipv6_accept_ra(idev)) 4276 return -EINVAL; 4277 if (idev->cnf.rtr_solicits <= 0) 4278 return -EINVAL; 4279 4280 write_lock_bh(&idev->lock); 4281 4282 BUILD_BUG_ON(sizeof(token->s6_addr) != 16); 4283 memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8); 4284 4285 write_unlock_bh(&idev->lock); 4286 4287 if (!idev->dead && (idev->if_flags & IF_READY) && 4288 !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE | 4289 IFA_F_OPTIMISTIC)) { 4290 4291 /* If we're not ready, then normal ifup will take care 4292 * of this. Otherwise, we need to request our rs here. 4293 */ 4294 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters); 4295 update_rs = true; 4296 } 4297 4298 write_lock_bh(&idev->lock); 4299 4300 if (update_rs) { 4301 idev->if_flags |= IF_RS_SENT; 4302 idev->rs_probes = 1; 4303 addrconf_mod_rs_timer(idev, idev->cnf.rtr_solicit_interval); 4304 } 4305 4306 /* Well, that's kinda nasty ... */ 4307 list_for_each_entry(ifp, &idev->addr_list, if_list) { 4308 spin_lock(&ifp->lock); 4309 if (ifp->tokenized) { 4310 ifp->valid_lft = 0; 4311 ifp->prefered_lft = 0; 4312 } 4313 spin_unlock(&ifp->lock); 4314 } 4315 4316 write_unlock_bh(&idev->lock); 4317 addrconf_verify(0); 4318 return 0; 4319 } 4320 4321 static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla) 4322 { 4323 int err = -EINVAL; 4324 struct inet6_dev *idev = __in6_dev_get(dev); 4325 struct nlattr *tb[IFLA_INET6_MAX + 1]; 4326 4327 if (!idev) 4328 return -EAFNOSUPPORT; 4329 4330 if (nla_parse_nested(tb, IFLA_INET6_MAX, nla, NULL) < 0) 4331 BUG(); 4332 4333 if (tb[IFLA_INET6_TOKEN]) 4334 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN])); 4335 4336 return err; 4337 } 4338 4339 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev, 4340 u32 portid, u32 seq, int event, unsigned int flags) 4341 { 4342 struct net_device *dev = idev->dev; 4343 struct ifinfomsg *hdr; 4344 struct nlmsghdr *nlh; 4345 void *protoinfo; 4346 4347 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags); 4348 if (nlh == NULL) 4349 return -EMSGSIZE; 4350 4351 hdr = nlmsg_data(nlh); 4352 hdr->ifi_family = AF_INET6; 4353 hdr->__ifi_pad = 0; 4354 hdr->ifi_type = dev->type; 4355 hdr->ifi_index = dev->ifindex; 4356 hdr->ifi_flags = dev_get_flags(dev); 4357 hdr->ifi_change = 0; 4358 4359 if (nla_put_string(skb, IFLA_IFNAME, dev->name) || 4360 (dev->addr_len && 4361 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) || 4362 nla_put_u32(skb, IFLA_MTU, dev->mtu) || 4363 (dev->ifindex != dev->iflink && 4364 nla_put_u32(skb, IFLA_LINK, dev->iflink))) 4365 goto nla_put_failure; 4366 protoinfo = nla_nest_start(skb, IFLA_PROTINFO); 4367 if (protoinfo == NULL) 4368 goto nla_put_failure; 4369 4370 if (inet6_fill_ifla6_attrs(skb, idev) < 0) 4371 goto nla_put_failure; 4372 4373 nla_nest_end(skb, protoinfo); 4374 return nlmsg_end(skb, nlh); 4375 4376 nla_put_failure: 4377 nlmsg_cancel(skb, nlh); 4378 return -EMSGSIZE; 4379 } 4380 4381 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb) 4382 { 4383 struct net *net = sock_net(skb->sk); 4384 int h, s_h; 4385 int idx = 0, s_idx; 4386 struct net_device *dev; 4387 struct inet6_dev *idev; 4388 struct hlist_head *head; 4389 4390 s_h = cb->args[0]; 4391 s_idx = cb->args[1]; 4392 4393 rcu_read_lock(); 4394 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 4395 idx = 0; 4396 head = &net->dev_index_head[h]; 4397 hlist_for_each_entry_rcu(dev, head, index_hlist) { 4398 if (idx < s_idx) 4399 goto cont; 4400 idev = __in6_dev_get(dev); 4401 if (!idev) 4402 goto cont; 4403 if (inet6_fill_ifinfo(skb, idev, 4404 NETLINK_CB(cb->skb).portid, 4405 cb->nlh->nlmsg_seq, 4406 RTM_NEWLINK, NLM_F_MULTI) <= 0) 4407 goto out; 4408 cont: 4409 idx++; 4410 } 4411 } 4412 out: 4413 rcu_read_unlock(); 4414 cb->args[1] = idx; 4415 cb->args[0] = h; 4416 4417 return skb->len; 4418 } 4419 4420 void inet6_ifinfo_notify(int event, struct inet6_dev *idev) 4421 { 4422 struct sk_buff *skb; 4423 struct net *net = dev_net(idev->dev); 4424 int err = -ENOBUFS; 4425 4426 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC); 4427 if (skb == NULL) 4428 goto errout; 4429 4430 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0); 4431 if (err < 0) { 4432 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */ 4433 WARN_ON(err == -EMSGSIZE); 4434 kfree_skb(skb); 4435 goto errout; 4436 } 4437 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC); 4438 return; 4439 errout: 4440 if (err < 0) 4441 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err); 4442 } 4443 4444 static inline size_t inet6_prefix_nlmsg_size(void) 4445 { 4446 return NLMSG_ALIGN(sizeof(struct prefixmsg)) 4447 + nla_total_size(sizeof(struct in6_addr)) 4448 + nla_total_size(sizeof(struct prefix_cacheinfo)); 4449 } 4450 4451 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev, 4452 struct prefix_info *pinfo, u32 portid, u32 seq, 4453 int event, unsigned int flags) 4454 { 4455 struct prefixmsg *pmsg; 4456 struct nlmsghdr *nlh; 4457 struct prefix_cacheinfo ci; 4458 4459 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags); 4460 if (nlh == NULL) 4461 return -EMSGSIZE; 4462 4463 pmsg = nlmsg_data(nlh); 4464 pmsg->prefix_family = AF_INET6; 4465 pmsg->prefix_pad1 = 0; 4466 pmsg->prefix_pad2 = 0; 4467 pmsg->prefix_ifindex = idev->dev->ifindex; 4468 pmsg->prefix_len = pinfo->prefix_len; 4469 pmsg->prefix_type = pinfo->type; 4470 pmsg->prefix_pad3 = 0; 4471 pmsg->prefix_flags = 0; 4472 if (pinfo->onlink) 4473 pmsg->prefix_flags |= IF_PREFIX_ONLINK; 4474 if (pinfo->autoconf) 4475 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF; 4476 4477 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix)) 4478 goto nla_put_failure; 4479 ci.preferred_time = ntohl(pinfo->prefered); 4480 ci.valid_time = ntohl(pinfo->valid); 4481 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci)) 4482 goto nla_put_failure; 4483 return nlmsg_end(skb, nlh); 4484 4485 nla_put_failure: 4486 nlmsg_cancel(skb, nlh); 4487 return -EMSGSIZE; 4488 } 4489 4490 static void inet6_prefix_notify(int event, struct inet6_dev *idev, 4491 struct prefix_info *pinfo) 4492 { 4493 struct sk_buff *skb; 4494 struct net *net = dev_net(idev->dev); 4495 int err = -ENOBUFS; 4496 4497 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC); 4498 if (skb == NULL) 4499 goto errout; 4500 4501 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0); 4502 if (err < 0) { 4503 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */ 4504 WARN_ON(err == -EMSGSIZE); 4505 kfree_skb(skb); 4506 goto errout; 4507 } 4508 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC); 4509 return; 4510 errout: 4511 if (err < 0) 4512 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err); 4513 } 4514 4515 static void update_valid_ll_addr_cnt(struct inet6_ifaddr *ifp, int count) 4516 { 4517 write_lock_bh(&ifp->idev->lock); 4518 spin_lock(&ifp->lock); 4519 if (((ifp->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE|IFA_F_OPTIMISTIC| 4520 IFA_F_DADFAILED)) == IFA_F_PERMANENT) && 4521 (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) 4522 ifp->idev->valid_ll_addr_cnt += count; 4523 WARN_ON(ifp->idev->valid_ll_addr_cnt < 0); 4524 spin_unlock(&ifp->lock); 4525 write_unlock_bh(&ifp->idev->lock); 4526 } 4527 4528 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 4529 { 4530 struct net *net = dev_net(ifp->idev->dev); 4531 4532 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp); 4533 4534 switch (event) { 4535 case RTM_NEWADDR: 4536 update_valid_ll_addr_cnt(ifp, 1); 4537 4538 /* 4539 * If the address was optimistic 4540 * we inserted the route at the start of 4541 * our DAD process, so we don't need 4542 * to do it again 4543 */ 4544 if (!(ifp->rt->rt6i_node)) 4545 ip6_ins_rt(ifp->rt); 4546 if (ifp->idev->cnf.forwarding) 4547 addrconf_join_anycast(ifp); 4548 if (!ipv6_addr_any(&ifp->peer_addr)) 4549 addrconf_prefix_route(&ifp->peer_addr, 128, 4550 ifp->idev->dev, 0, 0); 4551 break; 4552 case RTM_DELADDR: 4553 update_valid_ll_addr_cnt(ifp, -1); 4554 4555 if (ifp->idev->cnf.forwarding) 4556 addrconf_leave_anycast(ifp); 4557 addrconf_leave_solict(ifp->idev, &ifp->addr); 4558 if (!ipv6_addr_any(&ifp->peer_addr)) { 4559 struct rt6_info *rt; 4560 struct net_device *dev = ifp->idev->dev; 4561 4562 rt = rt6_lookup(dev_net(dev), &ifp->peer_addr, NULL, 4563 dev->ifindex, 1); 4564 if (rt) { 4565 dst_hold(&rt->dst); 4566 if (ip6_del_rt(rt)) 4567 dst_free(&rt->dst); 4568 } 4569 } 4570 dst_hold(&ifp->rt->dst); 4571 4572 if (ip6_del_rt(ifp->rt)) 4573 dst_free(&ifp->rt->dst); 4574 break; 4575 } 4576 atomic_inc(&net->ipv6.dev_addr_genid); 4577 rt_genid_bump_ipv6(net); 4578 } 4579 4580 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 4581 { 4582 rcu_read_lock_bh(); 4583 if (likely(ifp->idev->dead == 0)) 4584 __ipv6_ifa_notify(event, ifp); 4585 rcu_read_unlock_bh(); 4586 } 4587 4588 #ifdef CONFIG_SYSCTL 4589 4590 static 4591 int addrconf_sysctl_forward(struct ctl_table *ctl, int write, 4592 void __user *buffer, size_t *lenp, loff_t *ppos) 4593 { 4594 int *valp = ctl->data; 4595 int val = *valp; 4596 loff_t pos = *ppos; 4597 struct ctl_table lctl; 4598 int ret; 4599 4600 /* 4601 * ctl->data points to idev->cnf.forwarding, we should 4602 * not modify it until we get the rtnl lock. 4603 */ 4604 lctl = *ctl; 4605 lctl.data = &val; 4606 4607 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 4608 4609 if (write) 4610 ret = addrconf_fixup_forwarding(ctl, valp, val); 4611 if (ret) 4612 *ppos = pos; 4613 return ret; 4614 } 4615 4616 static void dev_disable_change(struct inet6_dev *idev) 4617 { 4618 struct netdev_notifier_info info; 4619 4620 if (!idev || !idev->dev) 4621 return; 4622 4623 netdev_notifier_info_init(&info, idev->dev); 4624 if (idev->cnf.disable_ipv6) 4625 addrconf_notify(NULL, NETDEV_DOWN, &info); 4626 else 4627 addrconf_notify(NULL, NETDEV_UP, &info); 4628 } 4629 4630 static void addrconf_disable_change(struct net *net, __s32 newf) 4631 { 4632 struct net_device *dev; 4633 struct inet6_dev *idev; 4634 4635 rcu_read_lock(); 4636 for_each_netdev_rcu(net, dev) { 4637 idev = __in6_dev_get(dev); 4638 if (idev) { 4639 int changed = (!idev->cnf.disable_ipv6) ^ (!newf); 4640 idev->cnf.disable_ipv6 = newf; 4641 if (changed) 4642 dev_disable_change(idev); 4643 } 4644 } 4645 rcu_read_unlock(); 4646 } 4647 4648 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf) 4649 { 4650 struct net *net; 4651 int old; 4652 4653 if (!rtnl_trylock()) 4654 return restart_syscall(); 4655 4656 net = (struct net *)table->extra2; 4657 old = *p; 4658 *p = newf; 4659 4660 if (p == &net->ipv6.devconf_dflt->disable_ipv6) { 4661 rtnl_unlock(); 4662 return 0; 4663 } 4664 4665 if (p == &net->ipv6.devconf_all->disable_ipv6) { 4666 net->ipv6.devconf_dflt->disable_ipv6 = newf; 4667 addrconf_disable_change(net, newf); 4668 } else if ((!newf) ^ (!old)) 4669 dev_disable_change((struct inet6_dev *)table->extra1); 4670 4671 rtnl_unlock(); 4672 return 0; 4673 } 4674 4675 static 4676 int addrconf_sysctl_disable(struct ctl_table *ctl, int write, 4677 void __user *buffer, size_t *lenp, loff_t *ppos) 4678 { 4679 int *valp = ctl->data; 4680 int val = *valp; 4681 loff_t pos = *ppos; 4682 struct ctl_table lctl; 4683 int ret; 4684 4685 /* 4686 * ctl->data points to idev->cnf.disable_ipv6, we should 4687 * not modify it until we get the rtnl lock. 4688 */ 4689 lctl = *ctl; 4690 lctl.data = &val; 4691 4692 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 4693 4694 if (write) 4695 ret = addrconf_disable_ipv6(ctl, valp, val); 4696 if (ret) 4697 *ppos = pos; 4698 return ret; 4699 } 4700 4701 static struct addrconf_sysctl_table 4702 { 4703 struct ctl_table_header *sysctl_header; 4704 struct ctl_table addrconf_vars[DEVCONF_MAX+1]; 4705 } addrconf_sysctl __read_mostly = { 4706 .sysctl_header = NULL, 4707 .addrconf_vars = { 4708 { 4709 .procname = "forwarding", 4710 .data = &ipv6_devconf.forwarding, 4711 .maxlen = sizeof(int), 4712 .mode = 0644, 4713 .proc_handler = addrconf_sysctl_forward, 4714 }, 4715 { 4716 .procname = "hop_limit", 4717 .data = &ipv6_devconf.hop_limit, 4718 .maxlen = sizeof(int), 4719 .mode = 0644, 4720 .proc_handler = proc_dointvec, 4721 }, 4722 { 4723 .procname = "mtu", 4724 .data = &ipv6_devconf.mtu6, 4725 .maxlen = sizeof(int), 4726 .mode = 0644, 4727 .proc_handler = proc_dointvec, 4728 }, 4729 { 4730 .procname = "accept_ra", 4731 .data = &ipv6_devconf.accept_ra, 4732 .maxlen = sizeof(int), 4733 .mode = 0644, 4734 .proc_handler = proc_dointvec, 4735 }, 4736 { 4737 .procname = "accept_redirects", 4738 .data = &ipv6_devconf.accept_redirects, 4739 .maxlen = sizeof(int), 4740 .mode = 0644, 4741 .proc_handler = proc_dointvec, 4742 }, 4743 { 4744 .procname = "autoconf", 4745 .data = &ipv6_devconf.autoconf, 4746 .maxlen = sizeof(int), 4747 .mode = 0644, 4748 .proc_handler = proc_dointvec, 4749 }, 4750 { 4751 .procname = "dad_transmits", 4752 .data = &ipv6_devconf.dad_transmits, 4753 .maxlen = sizeof(int), 4754 .mode = 0644, 4755 .proc_handler = proc_dointvec, 4756 }, 4757 { 4758 .procname = "router_solicitations", 4759 .data = &ipv6_devconf.rtr_solicits, 4760 .maxlen = sizeof(int), 4761 .mode = 0644, 4762 .proc_handler = proc_dointvec, 4763 }, 4764 { 4765 .procname = "router_solicitation_interval", 4766 .data = &ipv6_devconf.rtr_solicit_interval, 4767 .maxlen = sizeof(int), 4768 .mode = 0644, 4769 .proc_handler = proc_dointvec_jiffies, 4770 }, 4771 { 4772 .procname = "router_solicitation_delay", 4773 .data = &ipv6_devconf.rtr_solicit_delay, 4774 .maxlen = sizeof(int), 4775 .mode = 0644, 4776 .proc_handler = proc_dointvec_jiffies, 4777 }, 4778 { 4779 .procname = "force_mld_version", 4780 .data = &ipv6_devconf.force_mld_version, 4781 .maxlen = sizeof(int), 4782 .mode = 0644, 4783 .proc_handler = proc_dointvec, 4784 }, 4785 { 4786 .procname = "mldv1_unsolicited_report_interval", 4787 .data = 4788 &ipv6_devconf.mldv1_unsolicited_report_interval, 4789 .maxlen = sizeof(int), 4790 .mode = 0644, 4791 .proc_handler = proc_dointvec_ms_jiffies, 4792 }, 4793 { 4794 .procname = "mldv2_unsolicited_report_interval", 4795 .data = 4796 &ipv6_devconf.mldv2_unsolicited_report_interval, 4797 .maxlen = sizeof(int), 4798 .mode = 0644, 4799 .proc_handler = proc_dointvec_ms_jiffies, 4800 }, 4801 { 4802 .procname = "use_tempaddr", 4803 .data = &ipv6_devconf.use_tempaddr, 4804 .maxlen = sizeof(int), 4805 .mode = 0644, 4806 .proc_handler = proc_dointvec, 4807 }, 4808 { 4809 .procname = "temp_valid_lft", 4810 .data = &ipv6_devconf.temp_valid_lft, 4811 .maxlen = sizeof(int), 4812 .mode = 0644, 4813 .proc_handler = proc_dointvec, 4814 }, 4815 { 4816 .procname = "temp_prefered_lft", 4817 .data = &ipv6_devconf.temp_prefered_lft, 4818 .maxlen = sizeof(int), 4819 .mode = 0644, 4820 .proc_handler = proc_dointvec, 4821 }, 4822 { 4823 .procname = "regen_max_retry", 4824 .data = &ipv6_devconf.regen_max_retry, 4825 .maxlen = sizeof(int), 4826 .mode = 0644, 4827 .proc_handler = proc_dointvec, 4828 }, 4829 { 4830 .procname = "max_desync_factor", 4831 .data = &ipv6_devconf.max_desync_factor, 4832 .maxlen = sizeof(int), 4833 .mode = 0644, 4834 .proc_handler = proc_dointvec, 4835 }, 4836 { 4837 .procname = "max_addresses", 4838 .data = &ipv6_devconf.max_addresses, 4839 .maxlen = sizeof(int), 4840 .mode = 0644, 4841 .proc_handler = proc_dointvec, 4842 }, 4843 { 4844 .procname = "accept_ra_defrtr", 4845 .data = &ipv6_devconf.accept_ra_defrtr, 4846 .maxlen = sizeof(int), 4847 .mode = 0644, 4848 .proc_handler = proc_dointvec, 4849 }, 4850 { 4851 .procname = "accept_ra_pinfo", 4852 .data = &ipv6_devconf.accept_ra_pinfo, 4853 .maxlen = sizeof(int), 4854 .mode = 0644, 4855 .proc_handler = proc_dointvec, 4856 }, 4857 #ifdef CONFIG_IPV6_ROUTER_PREF 4858 { 4859 .procname = "accept_ra_rtr_pref", 4860 .data = &ipv6_devconf.accept_ra_rtr_pref, 4861 .maxlen = sizeof(int), 4862 .mode = 0644, 4863 .proc_handler = proc_dointvec, 4864 }, 4865 { 4866 .procname = "router_probe_interval", 4867 .data = &ipv6_devconf.rtr_probe_interval, 4868 .maxlen = sizeof(int), 4869 .mode = 0644, 4870 .proc_handler = proc_dointvec_jiffies, 4871 }, 4872 #ifdef CONFIG_IPV6_ROUTE_INFO 4873 { 4874 .procname = "accept_ra_rt_info_max_plen", 4875 .data = &ipv6_devconf.accept_ra_rt_info_max_plen, 4876 .maxlen = sizeof(int), 4877 .mode = 0644, 4878 .proc_handler = proc_dointvec, 4879 }, 4880 #endif 4881 #endif 4882 { 4883 .procname = "proxy_ndp", 4884 .data = &ipv6_devconf.proxy_ndp, 4885 .maxlen = sizeof(int), 4886 .mode = 0644, 4887 .proc_handler = proc_dointvec, 4888 }, 4889 { 4890 .procname = "accept_source_route", 4891 .data = &ipv6_devconf.accept_source_route, 4892 .maxlen = sizeof(int), 4893 .mode = 0644, 4894 .proc_handler = proc_dointvec, 4895 }, 4896 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 4897 { 4898 .procname = "optimistic_dad", 4899 .data = &ipv6_devconf.optimistic_dad, 4900 .maxlen = sizeof(int), 4901 .mode = 0644, 4902 .proc_handler = proc_dointvec, 4903 4904 }, 4905 #endif 4906 #ifdef CONFIG_IPV6_MROUTE 4907 { 4908 .procname = "mc_forwarding", 4909 .data = &ipv6_devconf.mc_forwarding, 4910 .maxlen = sizeof(int), 4911 .mode = 0444, 4912 .proc_handler = proc_dointvec, 4913 }, 4914 #endif 4915 { 4916 .procname = "disable_ipv6", 4917 .data = &ipv6_devconf.disable_ipv6, 4918 .maxlen = sizeof(int), 4919 .mode = 0644, 4920 .proc_handler = addrconf_sysctl_disable, 4921 }, 4922 { 4923 .procname = "accept_dad", 4924 .data = &ipv6_devconf.accept_dad, 4925 .maxlen = sizeof(int), 4926 .mode = 0644, 4927 .proc_handler = proc_dointvec, 4928 }, 4929 { 4930 .procname = "force_tllao", 4931 .data = &ipv6_devconf.force_tllao, 4932 .maxlen = sizeof(int), 4933 .mode = 0644, 4934 .proc_handler = proc_dointvec 4935 }, 4936 { 4937 .procname = "ndisc_notify", 4938 .data = &ipv6_devconf.ndisc_notify, 4939 .maxlen = sizeof(int), 4940 .mode = 0644, 4941 .proc_handler = proc_dointvec 4942 }, 4943 { 4944 .procname = "suppress_frag_ndisc", 4945 .data = &ipv6_devconf.suppress_frag_ndisc, 4946 .maxlen = sizeof(int), 4947 .mode = 0644, 4948 .proc_handler = proc_dointvec 4949 }, 4950 { 4951 /* sentinel */ 4952 } 4953 }, 4954 }; 4955 4956 static int __addrconf_sysctl_register(struct net *net, char *dev_name, 4957 struct inet6_dev *idev, struct ipv6_devconf *p) 4958 { 4959 int i; 4960 struct addrconf_sysctl_table *t; 4961 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ]; 4962 4963 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL); 4964 if (t == NULL) 4965 goto out; 4966 4967 for (i = 0; t->addrconf_vars[i].data; i++) { 4968 t->addrconf_vars[i].data += (char *)p - (char *)&ipv6_devconf; 4969 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */ 4970 t->addrconf_vars[i].extra2 = net; 4971 } 4972 4973 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name); 4974 4975 t->sysctl_header = register_net_sysctl(net, path, t->addrconf_vars); 4976 if (t->sysctl_header == NULL) 4977 goto free; 4978 4979 p->sysctl = t; 4980 return 0; 4981 4982 free: 4983 kfree(t); 4984 out: 4985 return -ENOBUFS; 4986 } 4987 4988 static void __addrconf_sysctl_unregister(struct ipv6_devconf *p) 4989 { 4990 struct addrconf_sysctl_table *t; 4991 4992 if (p->sysctl == NULL) 4993 return; 4994 4995 t = p->sysctl; 4996 p->sysctl = NULL; 4997 unregister_net_sysctl_table(t->sysctl_header); 4998 kfree(t); 4999 } 5000 5001 static void addrconf_sysctl_register(struct inet6_dev *idev) 5002 { 5003 neigh_sysctl_register(idev->dev, idev->nd_parms, "ipv6", 5004 &ndisc_ifinfo_sysctl_change); 5005 __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name, 5006 idev, &idev->cnf); 5007 } 5008 5009 static void addrconf_sysctl_unregister(struct inet6_dev *idev) 5010 { 5011 __addrconf_sysctl_unregister(&idev->cnf); 5012 neigh_sysctl_unregister(idev->nd_parms); 5013 } 5014 5015 5016 #endif 5017 5018 static int __net_init addrconf_init_net(struct net *net) 5019 { 5020 int err = -ENOMEM; 5021 struct ipv6_devconf *all, *dflt; 5022 5023 all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL); 5024 if (all == NULL) 5025 goto err_alloc_all; 5026 5027 dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL); 5028 if (dflt == NULL) 5029 goto err_alloc_dflt; 5030 5031 /* these will be inherited by all namespaces */ 5032 dflt->autoconf = ipv6_defaults.autoconf; 5033 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6; 5034 5035 net->ipv6.devconf_all = all; 5036 net->ipv6.devconf_dflt = dflt; 5037 5038 #ifdef CONFIG_SYSCTL 5039 err = __addrconf_sysctl_register(net, "all", NULL, all); 5040 if (err < 0) 5041 goto err_reg_all; 5042 5043 err = __addrconf_sysctl_register(net, "default", NULL, dflt); 5044 if (err < 0) 5045 goto err_reg_dflt; 5046 #endif 5047 return 0; 5048 5049 #ifdef CONFIG_SYSCTL 5050 err_reg_dflt: 5051 __addrconf_sysctl_unregister(all); 5052 err_reg_all: 5053 kfree(dflt); 5054 #endif 5055 err_alloc_dflt: 5056 kfree(all); 5057 err_alloc_all: 5058 return err; 5059 } 5060 5061 static void __net_exit addrconf_exit_net(struct net *net) 5062 { 5063 #ifdef CONFIG_SYSCTL 5064 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt); 5065 __addrconf_sysctl_unregister(net->ipv6.devconf_all); 5066 #endif 5067 if (!net_eq(net, &init_net)) { 5068 kfree(net->ipv6.devconf_dflt); 5069 kfree(net->ipv6.devconf_all); 5070 } 5071 } 5072 5073 static struct pernet_operations addrconf_ops = { 5074 .init = addrconf_init_net, 5075 .exit = addrconf_exit_net, 5076 }; 5077 5078 static struct rtnl_af_ops inet6_ops = { 5079 .family = AF_INET6, 5080 .fill_link_af = inet6_fill_link_af, 5081 .get_link_af_size = inet6_get_link_af_size, 5082 .set_link_af = inet6_set_link_af, 5083 }; 5084 5085 /* 5086 * Init / cleanup code 5087 */ 5088 5089 int __init addrconf_init(void) 5090 { 5091 int i, err; 5092 5093 err = ipv6_addr_label_init(); 5094 if (err < 0) { 5095 pr_crit("%s: cannot initialize default policy table: %d\n", 5096 __func__, err); 5097 goto out; 5098 } 5099 5100 err = register_pernet_subsys(&addrconf_ops); 5101 if (err < 0) 5102 goto out_addrlabel; 5103 5104 /* The addrconf netdev notifier requires that loopback_dev 5105 * has it's ipv6 private information allocated and setup 5106 * before it can bring up and give link-local addresses 5107 * to other devices which are up. 5108 * 5109 * Unfortunately, loopback_dev is not necessarily the first 5110 * entry in the global dev_base list of net devices. In fact, 5111 * it is likely to be the very last entry on that list. 5112 * So this causes the notifier registry below to try and 5113 * give link-local addresses to all devices besides loopback_dev 5114 * first, then loopback_dev, which cases all the non-loopback_dev 5115 * devices to fail to get a link-local address. 5116 * 5117 * So, as a temporary fix, allocate the ipv6 structure for 5118 * loopback_dev first by hand. 5119 * Longer term, all of the dependencies ipv6 has upon the loopback 5120 * device and it being up should be removed. 5121 */ 5122 rtnl_lock(); 5123 if (!ipv6_add_dev(init_net.loopback_dev)) 5124 err = -ENOMEM; 5125 rtnl_unlock(); 5126 if (err) 5127 goto errlo; 5128 5129 for (i = 0; i < IN6_ADDR_HSIZE; i++) 5130 INIT_HLIST_HEAD(&inet6_addr_lst[i]); 5131 5132 register_netdevice_notifier(&ipv6_dev_notf); 5133 5134 addrconf_verify(0); 5135 5136 err = rtnl_af_register(&inet6_ops); 5137 if (err < 0) 5138 goto errout_af; 5139 5140 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo, 5141 NULL); 5142 if (err < 0) 5143 goto errout; 5144 5145 /* Only the first call to __rtnl_register can fail */ 5146 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL, NULL); 5147 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL, NULL); 5148 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr, 5149 inet6_dump_ifaddr, NULL); 5150 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL, 5151 inet6_dump_ifmcaddr, NULL); 5152 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL, 5153 inet6_dump_ifacaddr, NULL); 5154 __rtnl_register(PF_INET6, RTM_GETNETCONF, inet6_netconf_get_devconf, 5155 inet6_netconf_dump_devconf, NULL); 5156 5157 ipv6_addr_label_rtnl_register(); 5158 5159 return 0; 5160 errout: 5161 rtnl_af_unregister(&inet6_ops); 5162 errout_af: 5163 unregister_netdevice_notifier(&ipv6_dev_notf); 5164 errlo: 5165 unregister_pernet_subsys(&addrconf_ops); 5166 out_addrlabel: 5167 ipv6_addr_label_cleanup(); 5168 out: 5169 return err; 5170 } 5171 5172 void addrconf_cleanup(void) 5173 { 5174 struct net_device *dev; 5175 int i; 5176 5177 unregister_netdevice_notifier(&ipv6_dev_notf); 5178 unregister_pernet_subsys(&addrconf_ops); 5179 ipv6_addr_label_cleanup(); 5180 5181 rtnl_lock(); 5182 5183 __rtnl_af_unregister(&inet6_ops); 5184 5185 /* clean dev list */ 5186 for_each_netdev(&init_net, dev) { 5187 if (__in6_dev_get(dev) == NULL) 5188 continue; 5189 addrconf_ifdown(dev, 1); 5190 } 5191 addrconf_ifdown(init_net.loopback_dev, 2); 5192 5193 /* 5194 * Check hash table. 5195 */ 5196 spin_lock_bh(&addrconf_hash_lock); 5197 for (i = 0; i < IN6_ADDR_HSIZE; i++) 5198 WARN_ON(!hlist_empty(&inet6_addr_lst[i])); 5199 spin_unlock_bh(&addrconf_hash_lock); 5200 5201 del_timer(&addr_chk_timer); 5202 rtnl_unlock(); 5203 } 5204