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 87 #ifdef CONFIG_IPV6_PRIVACY 88 #include <linux/random.h> 89 #endif 90 91 #include <linux/uaccess.h> 92 #include <asm/unaligned.h> 93 94 #include <linux/proc_fs.h> 95 #include <linux/seq_file.h> 96 #include <linux/export.h> 97 98 /* Set to 3 to get tracing... */ 99 #define ACONF_DEBUG 2 100 101 #if ACONF_DEBUG >= 3 102 #define ADBG(x) printk x 103 #else 104 #define ADBG(x) 105 #endif 106 107 #define INFINITY_LIFE_TIME 0xFFFFFFFF 108 109 static inline u32 cstamp_delta(unsigned long cstamp) 110 { 111 return (cstamp - INITIAL_JIFFIES) * 100UL / HZ; 112 } 113 114 #ifdef CONFIG_SYSCTL 115 static void addrconf_sysctl_register(struct inet6_dev *idev); 116 static void addrconf_sysctl_unregister(struct inet6_dev *idev); 117 #else 118 static inline void addrconf_sysctl_register(struct inet6_dev *idev) 119 { 120 } 121 122 static inline void addrconf_sysctl_unregister(struct inet6_dev *idev) 123 { 124 } 125 #endif 126 127 #ifdef CONFIG_IPV6_PRIVACY 128 static void __ipv6_regen_rndid(struct inet6_dev *idev); 129 static void __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr); 130 static void ipv6_regen_rndid(unsigned long data); 131 #endif 132 133 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev); 134 static int ipv6_count_addresses(struct inet6_dev *idev); 135 136 /* 137 * Configured unicast address hash table 138 */ 139 static struct hlist_head inet6_addr_lst[IN6_ADDR_HSIZE]; 140 static DEFINE_SPINLOCK(addrconf_hash_lock); 141 142 static void addrconf_verify(unsigned long); 143 144 static DEFINE_TIMER(addr_chk_timer, addrconf_verify, 0, 0); 145 static DEFINE_SPINLOCK(addrconf_verify_lock); 146 147 static void addrconf_join_anycast(struct inet6_ifaddr *ifp); 148 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp); 149 150 static void addrconf_type_change(struct net_device *dev, 151 unsigned long event); 152 static int addrconf_ifdown(struct net_device *dev, int how); 153 154 static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx, 155 int plen, 156 const struct net_device *dev, 157 u32 flags, u32 noflags); 158 159 static void addrconf_dad_start(struct inet6_ifaddr *ifp); 160 static void addrconf_dad_timer(unsigned long data); 161 static void addrconf_dad_completed(struct inet6_ifaddr *ifp); 162 static void addrconf_dad_run(struct inet6_dev *idev); 163 static void addrconf_rs_timer(unsigned long data); 164 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa); 165 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa); 166 167 static void inet6_prefix_notify(int event, struct inet6_dev *idev, 168 struct prefix_info *pinfo); 169 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr, 170 struct net_device *dev); 171 172 static struct ipv6_devconf ipv6_devconf __read_mostly = { 173 .forwarding = 0, 174 .hop_limit = IPV6_DEFAULT_HOPLIMIT, 175 .mtu6 = IPV6_MIN_MTU, 176 .accept_ra = 1, 177 .accept_redirects = 1, 178 .autoconf = 1, 179 .force_mld_version = 0, 180 .dad_transmits = 1, 181 .rtr_solicits = MAX_RTR_SOLICITATIONS, 182 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL, 183 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY, 184 #ifdef CONFIG_IPV6_PRIVACY 185 .use_tempaddr = 0, 186 .temp_valid_lft = TEMP_VALID_LIFETIME, 187 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME, 188 .regen_max_retry = REGEN_MAX_RETRY, 189 .max_desync_factor = MAX_DESYNC_FACTOR, 190 #endif 191 .max_addresses = IPV6_MAX_ADDRESSES, 192 .accept_ra_defrtr = 1, 193 .accept_ra_pinfo = 1, 194 #ifdef CONFIG_IPV6_ROUTER_PREF 195 .accept_ra_rtr_pref = 1, 196 .rtr_probe_interval = 60 * HZ, 197 #ifdef CONFIG_IPV6_ROUTE_INFO 198 .accept_ra_rt_info_max_plen = 0, 199 #endif 200 #endif 201 .proxy_ndp = 0, 202 .accept_source_route = 0, /* we do not accept RH0 by default. */ 203 .disable_ipv6 = 0, 204 .accept_dad = 1, 205 }; 206 207 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = { 208 .forwarding = 0, 209 .hop_limit = IPV6_DEFAULT_HOPLIMIT, 210 .mtu6 = IPV6_MIN_MTU, 211 .accept_ra = 1, 212 .accept_redirects = 1, 213 .autoconf = 1, 214 .dad_transmits = 1, 215 .rtr_solicits = MAX_RTR_SOLICITATIONS, 216 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL, 217 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY, 218 #ifdef CONFIG_IPV6_PRIVACY 219 .use_tempaddr = 0, 220 .temp_valid_lft = TEMP_VALID_LIFETIME, 221 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME, 222 .regen_max_retry = REGEN_MAX_RETRY, 223 .max_desync_factor = MAX_DESYNC_FACTOR, 224 #endif 225 .max_addresses = IPV6_MAX_ADDRESSES, 226 .accept_ra_defrtr = 1, 227 .accept_ra_pinfo = 1, 228 #ifdef CONFIG_IPV6_ROUTER_PREF 229 .accept_ra_rtr_pref = 1, 230 .rtr_probe_interval = 60 * HZ, 231 #ifdef CONFIG_IPV6_ROUTE_INFO 232 .accept_ra_rt_info_max_plen = 0, 233 #endif 234 #endif 235 .proxy_ndp = 0, 236 .accept_source_route = 0, /* we do not accept RH0 by default. */ 237 .disable_ipv6 = 0, 238 .accept_dad = 1, 239 }; 240 241 /* IPv6 Wildcard Address and Loopback Address defined by RFC2553 */ 242 const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT; 243 const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT; 244 const struct in6_addr in6addr_linklocal_allnodes = IN6ADDR_LINKLOCAL_ALLNODES_INIT; 245 const struct in6_addr in6addr_linklocal_allrouters = IN6ADDR_LINKLOCAL_ALLROUTERS_INIT; 246 const struct in6_addr in6addr_interfacelocal_allnodes = IN6ADDR_INTERFACELOCAL_ALLNODES_INIT; 247 const struct in6_addr in6addr_interfacelocal_allrouters = IN6ADDR_INTERFACELOCAL_ALLROUTERS_INIT; 248 const struct in6_addr in6addr_sitelocal_allrouters = IN6ADDR_SITELOCAL_ALLROUTERS_INIT; 249 250 /* Check if a valid qdisc is available */ 251 static inline bool addrconf_qdisc_ok(const struct net_device *dev) 252 { 253 return !qdisc_tx_is_noop(dev); 254 } 255 256 static void addrconf_del_timer(struct inet6_ifaddr *ifp) 257 { 258 if (del_timer(&ifp->timer)) 259 __in6_ifa_put(ifp); 260 } 261 262 enum addrconf_timer_t { 263 AC_NONE, 264 AC_DAD, 265 AC_RS, 266 }; 267 268 static void addrconf_mod_timer(struct inet6_ifaddr *ifp, 269 enum addrconf_timer_t what, 270 unsigned long when) 271 { 272 if (!del_timer(&ifp->timer)) 273 in6_ifa_hold(ifp); 274 275 switch (what) { 276 case AC_DAD: 277 ifp->timer.function = addrconf_dad_timer; 278 break; 279 case AC_RS: 280 ifp->timer.function = addrconf_rs_timer; 281 break; 282 default: 283 break; 284 } 285 ifp->timer.expires = jiffies + when; 286 add_timer(&ifp->timer); 287 } 288 289 static int snmp6_alloc_dev(struct inet6_dev *idev) 290 { 291 if (snmp_mib_init((void __percpu **)idev->stats.ipv6, 292 sizeof(struct ipstats_mib), 293 __alignof__(struct ipstats_mib)) < 0) 294 goto err_ip; 295 idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device), 296 GFP_KERNEL); 297 if (!idev->stats.icmpv6dev) 298 goto err_icmp; 299 idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device), 300 GFP_KERNEL); 301 if (!idev->stats.icmpv6msgdev) 302 goto err_icmpmsg; 303 304 return 0; 305 306 err_icmpmsg: 307 kfree(idev->stats.icmpv6dev); 308 err_icmp: 309 snmp_mib_free((void __percpu **)idev->stats.ipv6); 310 err_ip: 311 return -ENOMEM; 312 } 313 314 static void snmp6_free_dev(struct inet6_dev *idev) 315 { 316 kfree(idev->stats.icmpv6msgdev); 317 kfree(idev->stats.icmpv6dev); 318 snmp_mib_free((void __percpu **)idev->stats.ipv6); 319 } 320 321 /* Nobody refers to this device, we may destroy it. */ 322 323 void in6_dev_finish_destroy(struct inet6_dev *idev) 324 { 325 struct net_device *dev = idev->dev; 326 327 WARN_ON(!list_empty(&idev->addr_list)); 328 WARN_ON(idev->mc_list != NULL); 329 330 #ifdef NET_REFCNT_DEBUG 331 pr_debug("%s: %s\n", __func__, dev ? dev->name : "NIL"); 332 #endif 333 dev_put(dev); 334 if (!idev->dead) { 335 pr_warn("Freeing alive inet6 device %p\n", idev); 336 return; 337 } 338 snmp6_free_dev(idev); 339 kfree_rcu(idev, rcu); 340 } 341 EXPORT_SYMBOL(in6_dev_finish_destroy); 342 343 static struct inet6_dev *ipv6_add_dev(struct net_device *dev) 344 { 345 struct inet6_dev *ndev; 346 347 ASSERT_RTNL(); 348 349 if (dev->mtu < IPV6_MIN_MTU) 350 return NULL; 351 352 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL); 353 354 if (ndev == NULL) 355 return NULL; 356 357 rwlock_init(&ndev->lock); 358 ndev->dev = dev; 359 INIT_LIST_HEAD(&ndev->addr_list); 360 361 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf)); 362 ndev->cnf.mtu6 = dev->mtu; 363 ndev->cnf.sysctl = NULL; 364 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl); 365 if (ndev->nd_parms == NULL) { 366 kfree(ndev); 367 return NULL; 368 } 369 if (ndev->cnf.forwarding) 370 dev_disable_lro(dev); 371 /* We refer to the device */ 372 dev_hold(dev); 373 374 if (snmp6_alloc_dev(ndev) < 0) { 375 ADBG((KERN_WARNING 376 "%s: cannot allocate memory for statistics; dev=%s.\n", 377 __func__, dev->name)); 378 neigh_parms_release(&nd_tbl, ndev->nd_parms); 379 dev_put(dev); 380 kfree(ndev); 381 return NULL; 382 } 383 384 if (snmp6_register_dev(ndev) < 0) { 385 ADBG((KERN_WARNING 386 "%s: cannot create /proc/net/dev_snmp6/%s\n", 387 __func__, dev->name)); 388 neigh_parms_release(&nd_tbl, ndev->nd_parms); 389 ndev->dead = 1; 390 in6_dev_finish_destroy(ndev); 391 return NULL; 392 } 393 394 /* One reference from device. We must do this before 395 * we invoke __ipv6_regen_rndid(). 396 */ 397 in6_dev_hold(ndev); 398 399 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK)) 400 ndev->cnf.accept_dad = -1; 401 402 #if IS_ENABLED(CONFIG_IPV6_SIT) 403 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) { 404 pr_info("%s: Disabled Multicast RS\n", dev->name); 405 ndev->cnf.rtr_solicits = 0; 406 } 407 #endif 408 409 #ifdef CONFIG_IPV6_PRIVACY 410 INIT_LIST_HEAD(&ndev->tempaddr_list); 411 setup_timer(&ndev->regen_timer, ipv6_regen_rndid, (unsigned long)ndev); 412 if ((dev->flags&IFF_LOOPBACK) || 413 dev->type == ARPHRD_TUNNEL || 414 dev->type == ARPHRD_TUNNEL6 || 415 dev->type == ARPHRD_SIT || 416 dev->type == ARPHRD_NONE) { 417 ndev->cnf.use_tempaddr = -1; 418 } else { 419 in6_dev_hold(ndev); 420 ipv6_regen_rndid((unsigned long) ndev); 421 } 422 #endif 423 ndev->token = in6addr_any; 424 425 if (netif_running(dev) && addrconf_qdisc_ok(dev)) 426 ndev->if_flags |= IF_READY; 427 428 ipv6_mc_init_dev(ndev); 429 ndev->tstamp = jiffies; 430 addrconf_sysctl_register(ndev); 431 /* protected by rtnl_lock */ 432 rcu_assign_pointer(dev->ip6_ptr, ndev); 433 434 /* Join interface-local all-node multicast group */ 435 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allnodes); 436 437 /* Join all-node multicast group */ 438 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes); 439 440 /* Join all-router multicast group if forwarding is set */ 441 if (ndev->cnf.forwarding && (dev->flags & IFF_MULTICAST)) 442 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters); 443 444 return ndev; 445 } 446 447 static struct inet6_dev *ipv6_find_idev(struct net_device *dev) 448 { 449 struct inet6_dev *idev; 450 451 ASSERT_RTNL(); 452 453 idev = __in6_dev_get(dev); 454 if (!idev) { 455 idev = ipv6_add_dev(dev); 456 if (!idev) 457 return NULL; 458 } 459 460 if (dev->flags&IFF_UP) 461 ipv6_mc_up(idev); 462 return idev; 463 } 464 465 static int inet6_netconf_msgsize_devconf(int type) 466 { 467 int size = NLMSG_ALIGN(sizeof(struct netconfmsg)) 468 + nla_total_size(4); /* NETCONFA_IFINDEX */ 469 470 /* type -1 is used for ALL */ 471 if (type == -1 || type == NETCONFA_FORWARDING) 472 size += nla_total_size(4); 473 #ifdef CONFIG_IPV6_MROUTE 474 if (type == -1 || type == NETCONFA_MC_FORWARDING) 475 size += nla_total_size(4); 476 #endif 477 478 return size; 479 } 480 481 static int inet6_netconf_fill_devconf(struct sk_buff *skb, int ifindex, 482 struct ipv6_devconf *devconf, u32 portid, 483 u32 seq, int event, unsigned int flags, 484 int type) 485 { 486 struct nlmsghdr *nlh; 487 struct netconfmsg *ncm; 488 489 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg), 490 flags); 491 if (nlh == NULL) 492 return -EMSGSIZE; 493 494 ncm = nlmsg_data(nlh); 495 ncm->ncm_family = AF_INET6; 496 497 if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0) 498 goto nla_put_failure; 499 500 /* type -1 is used for ALL */ 501 if ((type == -1 || type == NETCONFA_FORWARDING) && 502 nla_put_s32(skb, NETCONFA_FORWARDING, devconf->forwarding) < 0) 503 goto nla_put_failure; 504 #ifdef CONFIG_IPV6_MROUTE 505 if ((type == -1 || type == NETCONFA_MC_FORWARDING) && 506 nla_put_s32(skb, NETCONFA_MC_FORWARDING, 507 devconf->mc_forwarding) < 0) 508 goto nla_put_failure; 509 #endif 510 return nlmsg_end(skb, nlh); 511 512 nla_put_failure: 513 nlmsg_cancel(skb, nlh); 514 return -EMSGSIZE; 515 } 516 517 void inet6_netconf_notify_devconf(struct net *net, int type, int ifindex, 518 struct ipv6_devconf *devconf) 519 { 520 struct sk_buff *skb; 521 int err = -ENOBUFS; 522 523 skb = nlmsg_new(inet6_netconf_msgsize_devconf(type), GFP_ATOMIC); 524 if (skb == NULL) 525 goto errout; 526 527 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 0, 0, 528 RTM_NEWNETCONF, 0, type); 529 if (err < 0) { 530 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */ 531 WARN_ON(err == -EMSGSIZE); 532 kfree_skb(skb); 533 goto errout; 534 } 535 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_NETCONF, NULL, GFP_ATOMIC); 536 return; 537 errout: 538 rtnl_set_sk_err(net, RTNLGRP_IPV6_NETCONF, err); 539 } 540 541 static const struct nla_policy devconf_ipv6_policy[NETCONFA_MAX+1] = { 542 [NETCONFA_IFINDEX] = { .len = sizeof(int) }, 543 [NETCONFA_FORWARDING] = { .len = sizeof(int) }, 544 }; 545 546 static int inet6_netconf_get_devconf(struct sk_buff *in_skb, 547 struct nlmsghdr *nlh) 548 { 549 struct net *net = sock_net(in_skb->sk); 550 struct nlattr *tb[NETCONFA_MAX+1]; 551 struct netconfmsg *ncm; 552 struct sk_buff *skb; 553 struct ipv6_devconf *devconf; 554 struct inet6_dev *in6_dev; 555 struct net_device *dev; 556 int ifindex; 557 int err; 558 559 err = nlmsg_parse(nlh, sizeof(*ncm), tb, NETCONFA_MAX, 560 devconf_ipv6_policy); 561 if (err < 0) 562 goto errout; 563 564 err = EINVAL; 565 if (!tb[NETCONFA_IFINDEX]) 566 goto errout; 567 568 ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]); 569 switch (ifindex) { 570 case NETCONFA_IFINDEX_ALL: 571 devconf = net->ipv6.devconf_all; 572 break; 573 case NETCONFA_IFINDEX_DEFAULT: 574 devconf = net->ipv6.devconf_dflt; 575 break; 576 default: 577 dev = __dev_get_by_index(net, ifindex); 578 if (dev == NULL) 579 goto errout; 580 in6_dev = __in6_dev_get(dev); 581 if (in6_dev == NULL) 582 goto errout; 583 devconf = &in6_dev->cnf; 584 break; 585 } 586 587 err = -ENOBUFS; 588 skb = nlmsg_new(inet6_netconf_msgsize_devconf(-1), GFP_ATOMIC); 589 if (skb == NULL) 590 goto errout; 591 592 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 593 NETLINK_CB(in_skb).portid, 594 nlh->nlmsg_seq, RTM_NEWNETCONF, 0, 595 -1); 596 if (err < 0) { 597 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */ 598 WARN_ON(err == -EMSGSIZE); 599 kfree_skb(skb); 600 goto errout; 601 } 602 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid); 603 errout: 604 return err; 605 } 606 607 static int inet6_netconf_dump_devconf(struct sk_buff *skb, 608 struct netlink_callback *cb) 609 { 610 struct net *net = sock_net(skb->sk); 611 int h, s_h; 612 int idx, s_idx; 613 struct net_device *dev; 614 struct inet6_dev *idev; 615 struct hlist_head *head; 616 617 s_h = cb->args[0]; 618 s_idx = idx = cb->args[1]; 619 620 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 621 idx = 0; 622 head = &net->dev_index_head[h]; 623 rcu_read_lock(); 624 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ 625 net->dev_base_seq; 626 hlist_for_each_entry_rcu(dev, head, index_hlist) { 627 if (idx < s_idx) 628 goto cont; 629 idev = __in6_dev_get(dev); 630 if (!idev) 631 goto cont; 632 633 if (inet6_netconf_fill_devconf(skb, dev->ifindex, 634 &idev->cnf, 635 NETLINK_CB(cb->skb).portid, 636 cb->nlh->nlmsg_seq, 637 RTM_NEWNETCONF, 638 NLM_F_MULTI, 639 -1) <= 0) { 640 rcu_read_unlock(); 641 goto done; 642 } 643 nl_dump_check_consistent(cb, nlmsg_hdr(skb)); 644 cont: 645 idx++; 646 } 647 rcu_read_unlock(); 648 } 649 if (h == NETDEV_HASHENTRIES) { 650 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL, 651 net->ipv6.devconf_all, 652 NETLINK_CB(cb->skb).portid, 653 cb->nlh->nlmsg_seq, 654 RTM_NEWNETCONF, NLM_F_MULTI, 655 -1) <= 0) 656 goto done; 657 else 658 h++; 659 } 660 if (h == NETDEV_HASHENTRIES + 1) { 661 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT, 662 net->ipv6.devconf_dflt, 663 NETLINK_CB(cb->skb).portid, 664 cb->nlh->nlmsg_seq, 665 RTM_NEWNETCONF, NLM_F_MULTI, 666 -1) <= 0) 667 goto done; 668 else 669 h++; 670 } 671 done: 672 cb->args[0] = h; 673 cb->args[1] = idx; 674 675 return skb->len; 676 } 677 678 #ifdef CONFIG_SYSCTL 679 static void dev_forward_change(struct inet6_dev *idev) 680 { 681 struct net_device *dev; 682 struct inet6_ifaddr *ifa; 683 684 if (!idev) 685 return; 686 dev = idev->dev; 687 if (idev->cnf.forwarding) 688 dev_disable_lro(dev); 689 if (dev->flags & IFF_MULTICAST) { 690 if (idev->cnf.forwarding) { 691 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters); 692 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allrouters); 693 ipv6_dev_mc_inc(dev, &in6addr_sitelocal_allrouters); 694 } else { 695 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters); 696 ipv6_dev_mc_dec(dev, &in6addr_interfacelocal_allrouters); 697 ipv6_dev_mc_dec(dev, &in6addr_sitelocal_allrouters); 698 } 699 } 700 701 list_for_each_entry(ifa, &idev->addr_list, if_list) { 702 if (ifa->flags&IFA_F_TENTATIVE) 703 continue; 704 if (idev->cnf.forwarding) 705 addrconf_join_anycast(ifa); 706 else 707 addrconf_leave_anycast(ifa); 708 } 709 inet6_netconf_notify_devconf(dev_net(dev), NETCONFA_FORWARDING, 710 dev->ifindex, &idev->cnf); 711 } 712 713 714 static void addrconf_forward_change(struct net *net, __s32 newf) 715 { 716 struct net_device *dev; 717 struct inet6_dev *idev; 718 719 for_each_netdev(net, dev) { 720 idev = __in6_dev_get(dev); 721 if (idev) { 722 int changed = (!idev->cnf.forwarding) ^ (!newf); 723 idev->cnf.forwarding = newf; 724 if (changed) 725 dev_forward_change(idev); 726 } 727 } 728 } 729 730 static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf) 731 { 732 struct net *net; 733 int old; 734 735 if (!rtnl_trylock()) 736 return restart_syscall(); 737 738 net = (struct net *)table->extra2; 739 old = *p; 740 *p = newf; 741 742 if (p == &net->ipv6.devconf_dflt->forwarding) { 743 if ((!newf) ^ (!old)) 744 inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING, 745 NETCONFA_IFINDEX_DEFAULT, 746 net->ipv6.devconf_dflt); 747 rtnl_unlock(); 748 return 0; 749 } 750 751 if (p == &net->ipv6.devconf_all->forwarding) { 752 net->ipv6.devconf_dflt->forwarding = newf; 753 addrconf_forward_change(net, newf); 754 if ((!newf) ^ (!old)) 755 inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING, 756 NETCONFA_IFINDEX_ALL, 757 net->ipv6.devconf_all); 758 } else if ((!newf) ^ (!old)) 759 dev_forward_change((struct inet6_dev *)table->extra1); 760 rtnl_unlock(); 761 762 if (newf) 763 rt6_purge_dflt_routers(net); 764 return 1; 765 } 766 #endif 767 768 /* Nobody refers to this ifaddr, destroy it */ 769 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp) 770 { 771 WARN_ON(!hlist_unhashed(&ifp->addr_lst)); 772 773 #ifdef NET_REFCNT_DEBUG 774 pr_debug("%s\n", __func__); 775 #endif 776 777 in6_dev_put(ifp->idev); 778 779 if (del_timer(&ifp->timer)) 780 pr_notice("Timer is still running, when freeing ifa=%p\n", ifp); 781 782 if (ifp->state != INET6_IFADDR_STATE_DEAD) { 783 pr_warn("Freeing alive inet6 address %p\n", ifp); 784 return; 785 } 786 ip6_rt_put(ifp->rt); 787 788 kfree_rcu(ifp, rcu); 789 } 790 791 static void 792 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp) 793 { 794 struct list_head *p; 795 int ifp_scope = ipv6_addr_src_scope(&ifp->addr); 796 797 /* 798 * Each device address list is sorted in order of scope - 799 * global before linklocal. 800 */ 801 list_for_each(p, &idev->addr_list) { 802 struct inet6_ifaddr *ifa 803 = list_entry(p, struct inet6_ifaddr, if_list); 804 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr)) 805 break; 806 } 807 808 list_add_tail(&ifp->if_list, p); 809 } 810 811 static u32 inet6_addr_hash(const struct in6_addr *addr) 812 { 813 return hash_32(ipv6_addr_hash(addr), IN6_ADDR_HSIZE_SHIFT); 814 } 815 816 /* On success it returns ifp with increased reference count */ 817 818 static struct inet6_ifaddr * 819 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, int pfxlen, 820 int scope, u32 flags) 821 { 822 struct inet6_ifaddr *ifa = NULL; 823 struct rt6_info *rt; 824 unsigned int hash; 825 int err = 0; 826 int addr_type = ipv6_addr_type(addr); 827 828 if (addr_type == IPV6_ADDR_ANY || 829 addr_type & IPV6_ADDR_MULTICAST || 830 (!(idev->dev->flags & IFF_LOOPBACK) && 831 addr_type & IPV6_ADDR_LOOPBACK)) 832 return ERR_PTR(-EADDRNOTAVAIL); 833 834 rcu_read_lock_bh(); 835 if (idev->dead) { 836 err = -ENODEV; /*XXX*/ 837 goto out2; 838 } 839 840 if (idev->cnf.disable_ipv6) { 841 err = -EACCES; 842 goto out2; 843 } 844 845 spin_lock(&addrconf_hash_lock); 846 847 /* Ignore adding duplicate addresses on an interface */ 848 if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) { 849 ADBG(("ipv6_add_addr: already assigned\n")); 850 err = -EEXIST; 851 goto out; 852 } 853 854 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC); 855 856 if (ifa == NULL) { 857 ADBG(("ipv6_add_addr: malloc failed\n")); 858 err = -ENOBUFS; 859 goto out; 860 } 861 862 rt = addrconf_dst_alloc(idev, addr, false); 863 if (IS_ERR(rt)) { 864 err = PTR_ERR(rt); 865 goto out; 866 } 867 868 ifa->addr = *addr; 869 870 spin_lock_init(&ifa->lock); 871 spin_lock_init(&ifa->state_lock); 872 init_timer(&ifa->timer); 873 INIT_HLIST_NODE(&ifa->addr_lst); 874 ifa->timer.data = (unsigned long) ifa; 875 ifa->scope = scope; 876 ifa->prefix_len = pfxlen; 877 ifa->flags = flags | IFA_F_TENTATIVE; 878 ifa->cstamp = ifa->tstamp = jiffies; 879 ifa->tokenized = false; 880 881 ifa->rt = rt; 882 883 ifa->idev = idev; 884 in6_dev_hold(idev); 885 /* For caller */ 886 in6_ifa_hold(ifa); 887 888 /* Add to big hash table */ 889 hash = inet6_addr_hash(addr); 890 891 hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]); 892 spin_unlock(&addrconf_hash_lock); 893 894 write_lock(&idev->lock); 895 /* Add to inet6_dev unicast addr list. */ 896 ipv6_link_dev_addr(idev, ifa); 897 898 #ifdef CONFIG_IPV6_PRIVACY 899 if (ifa->flags&IFA_F_TEMPORARY) { 900 list_add(&ifa->tmp_list, &idev->tempaddr_list); 901 in6_ifa_hold(ifa); 902 } 903 #endif 904 905 in6_ifa_hold(ifa); 906 write_unlock(&idev->lock); 907 out2: 908 rcu_read_unlock_bh(); 909 910 if (likely(err == 0)) 911 inet6addr_notifier_call_chain(NETDEV_UP, ifa); 912 else { 913 kfree(ifa); 914 ifa = ERR_PTR(err); 915 } 916 917 return ifa; 918 out: 919 spin_unlock(&addrconf_hash_lock); 920 goto out2; 921 } 922 923 /* This function wants to get referenced ifp and releases it before return */ 924 925 static void ipv6_del_addr(struct inet6_ifaddr *ifp) 926 { 927 struct inet6_ifaddr *ifa, *ifn; 928 struct inet6_dev *idev = ifp->idev; 929 int state; 930 int deleted = 0, onlink = 0; 931 unsigned long expires = jiffies; 932 933 spin_lock_bh(&ifp->state_lock); 934 state = ifp->state; 935 ifp->state = INET6_IFADDR_STATE_DEAD; 936 spin_unlock_bh(&ifp->state_lock); 937 938 if (state == INET6_IFADDR_STATE_DEAD) 939 goto out; 940 941 spin_lock_bh(&addrconf_hash_lock); 942 hlist_del_init_rcu(&ifp->addr_lst); 943 spin_unlock_bh(&addrconf_hash_lock); 944 945 write_lock_bh(&idev->lock); 946 #ifdef CONFIG_IPV6_PRIVACY 947 if (ifp->flags&IFA_F_TEMPORARY) { 948 list_del(&ifp->tmp_list); 949 if (ifp->ifpub) { 950 in6_ifa_put(ifp->ifpub); 951 ifp->ifpub = NULL; 952 } 953 __in6_ifa_put(ifp); 954 } 955 #endif 956 957 list_for_each_entry_safe(ifa, ifn, &idev->addr_list, if_list) { 958 if (ifa == ifp) { 959 list_del_init(&ifp->if_list); 960 __in6_ifa_put(ifp); 961 962 if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0) 963 break; 964 deleted = 1; 965 continue; 966 } else if (ifp->flags & IFA_F_PERMANENT) { 967 if (ipv6_prefix_equal(&ifa->addr, &ifp->addr, 968 ifp->prefix_len)) { 969 if (ifa->flags & IFA_F_PERMANENT) { 970 onlink = 1; 971 if (deleted) 972 break; 973 } else { 974 unsigned long lifetime; 975 976 if (!onlink) 977 onlink = -1; 978 979 spin_lock(&ifa->lock); 980 981 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ); 982 /* 983 * Note: Because this address is 984 * not permanent, lifetime < 985 * LONG_MAX / HZ here. 986 */ 987 if (time_before(expires, 988 ifa->tstamp + lifetime * HZ)) 989 expires = ifa->tstamp + lifetime * HZ; 990 spin_unlock(&ifa->lock); 991 } 992 } 993 } 994 } 995 write_unlock_bh(&idev->lock); 996 997 addrconf_del_timer(ifp); 998 999 ipv6_ifa_notify(RTM_DELADDR, ifp); 1000 1001 inet6addr_notifier_call_chain(NETDEV_DOWN, ifp); 1002 1003 /* 1004 * Purge or update corresponding prefix 1005 * 1006 * 1) we don't purge prefix here if address was not permanent. 1007 * prefix is managed by its own lifetime. 1008 * 2) if there're no addresses, delete prefix. 1009 * 3) if there're still other permanent address(es), 1010 * corresponding prefix is still permanent. 1011 * 4) otherwise, update prefix lifetime to the 1012 * longest valid lifetime among the corresponding 1013 * addresses on the device. 1014 * Note: subsequent RA will update lifetime. 1015 * 1016 * --yoshfuji 1017 */ 1018 if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) { 1019 struct in6_addr prefix; 1020 struct rt6_info *rt; 1021 1022 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len); 1023 1024 rt = addrconf_get_prefix_route(&prefix, 1025 ifp->prefix_len, 1026 ifp->idev->dev, 1027 0, RTF_GATEWAY | RTF_DEFAULT); 1028 1029 if (rt) { 1030 if (onlink == 0) { 1031 ip6_del_rt(rt); 1032 rt = NULL; 1033 } else if (!(rt->rt6i_flags & RTF_EXPIRES)) { 1034 rt6_set_expires(rt, expires); 1035 } 1036 } 1037 ip6_rt_put(rt); 1038 } 1039 1040 /* clean up prefsrc entries */ 1041 rt6_remove_prefsrc(ifp); 1042 out: 1043 in6_ifa_put(ifp); 1044 } 1045 1046 #ifdef CONFIG_IPV6_PRIVACY 1047 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift) 1048 { 1049 struct inet6_dev *idev = ifp->idev; 1050 struct in6_addr addr, *tmpaddr; 1051 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_tstamp, age; 1052 unsigned long regen_advance; 1053 int tmp_plen; 1054 int ret = 0; 1055 int max_addresses; 1056 u32 addr_flags; 1057 unsigned long now = jiffies; 1058 1059 write_lock(&idev->lock); 1060 if (ift) { 1061 spin_lock_bh(&ift->lock); 1062 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8); 1063 spin_unlock_bh(&ift->lock); 1064 tmpaddr = &addr; 1065 } else { 1066 tmpaddr = NULL; 1067 } 1068 retry: 1069 in6_dev_hold(idev); 1070 if (idev->cnf.use_tempaddr <= 0) { 1071 write_unlock(&idev->lock); 1072 pr_info("%s: use_tempaddr is disabled\n", __func__); 1073 in6_dev_put(idev); 1074 ret = -1; 1075 goto out; 1076 } 1077 spin_lock_bh(&ifp->lock); 1078 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) { 1079 idev->cnf.use_tempaddr = -1; /*XXX*/ 1080 spin_unlock_bh(&ifp->lock); 1081 write_unlock(&idev->lock); 1082 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n", 1083 __func__); 1084 in6_dev_put(idev); 1085 ret = -1; 1086 goto out; 1087 } 1088 in6_ifa_hold(ifp); 1089 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8); 1090 __ipv6_try_regen_rndid(idev, tmpaddr); 1091 memcpy(&addr.s6_addr[8], idev->rndid, 8); 1092 age = (now - ifp->tstamp) / HZ; 1093 tmp_valid_lft = min_t(__u32, 1094 ifp->valid_lft, 1095 idev->cnf.temp_valid_lft + age); 1096 tmp_prefered_lft = min_t(__u32, 1097 ifp->prefered_lft, 1098 idev->cnf.temp_prefered_lft + age - 1099 idev->cnf.max_desync_factor); 1100 tmp_plen = ifp->prefix_len; 1101 max_addresses = idev->cnf.max_addresses; 1102 tmp_tstamp = ifp->tstamp; 1103 spin_unlock_bh(&ifp->lock); 1104 1105 regen_advance = idev->cnf.regen_max_retry * 1106 idev->cnf.dad_transmits * 1107 idev->nd_parms->retrans_time / HZ; 1108 write_unlock(&idev->lock); 1109 1110 /* A temporary address is created only if this calculated Preferred 1111 * Lifetime is greater than REGEN_ADVANCE time units. In particular, 1112 * an implementation must not create a temporary address with a zero 1113 * Preferred Lifetime. 1114 */ 1115 if (tmp_prefered_lft <= regen_advance) { 1116 in6_ifa_put(ifp); 1117 in6_dev_put(idev); 1118 ret = -1; 1119 goto out; 1120 } 1121 1122 addr_flags = IFA_F_TEMPORARY; 1123 /* set in addrconf_prefix_rcv() */ 1124 if (ifp->flags & IFA_F_OPTIMISTIC) 1125 addr_flags |= IFA_F_OPTIMISTIC; 1126 1127 ift = !max_addresses || 1128 ipv6_count_addresses(idev) < max_addresses ? 1129 ipv6_add_addr(idev, &addr, tmp_plen, 1130 ipv6_addr_type(&addr)&IPV6_ADDR_SCOPE_MASK, 1131 addr_flags) : NULL; 1132 if (IS_ERR_OR_NULL(ift)) { 1133 in6_ifa_put(ifp); 1134 in6_dev_put(idev); 1135 pr_info("%s: retry temporary address regeneration\n", __func__); 1136 tmpaddr = &addr; 1137 write_lock(&idev->lock); 1138 goto retry; 1139 } 1140 1141 spin_lock_bh(&ift->lock); 1142 ift->ifpub = ifp; 1143 ift->valid_lft = tmp_valid_lft; 1144 ift->prefered_lft = tmp_prefered_lft; 1145 ift->cstamp = now; 1146 ift->tstamp = tmp_tstamp; 1147 spin_unlock_bh(&ift->lock); 1148 1149 addrconf_dad_start(ift); 1150 in6_ifa_put(ift); 1151 in6_dev_put(idev); 1152 out: 1153 return ret; 1154 } 1155 #endif 1156 1157 /* 1158 * Choose an appropriate source address (RFC3484) 1159 */ 1160 enum { 1161 IPV6_SADDR_RULE_INIT = 0, 1162 IPV6_SADDR_RULE_LOCAL, 1163 IPV6_SADDR_RULE_SCOPE, 1164 IPV6_SADDR_RULE_PREFERRED, 1165 #ifdef CONFIG_IPV6_MIP6 1166 IPV6_SADDR_RULE_HOA, 1167 #endif 1168 IPV6_SADDR_RULE_OIF, 1169 IPV6_SADDR_RULE_LABEL, 1170 #ifdef CONFIG_IPV6_PRIVACY 1171 IPV6_SADDR_RULE_PRIVACY, 1172 #endif 1173 IPV6_SADDR_RULE_ORCHID, 1174 IPV6_SADDR_RULE_PREFIX, 1175 IPV6_SADDR_RULE_MAX 1176 }; 1177 1178 struct ipv6_saddr_score { 1179 int rule; 1180 int addr_type; 1181 struct inet6_ifaddr *ifa; 1182 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX); 1183 int scopedist; 1184 int matchlen; 1185 }; 1186 1187 struct ipv6_saddr_dst { 1188 const struct in6_addr *addr; 1189 int ifindex; 1190 int scope; 1191 int label; 1192 unsigned int prefs; 1193 }; 1194 1195 static inline int ipv6_saddr_preferred(int type) 1196 { 1197 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK)) 1198 return 1; 1199 return 0; 1200 } 1201 1202 static int ipv6_get_saddr_eval(struct net *net, 1203 struct ipv6_saddr_score *score, 1204 struct ipv6_saddr_dst *dst, 1205 int i) 1206 { 1207 int ret; 1208 1209 if (i <= score->rule) { 1210 switch (i) { 1211 case IPV6_SADDR_RULE_SCOPE: 1212 ret = score->scopedist; 1213 break; 1214 case IPV6_SADDR_RULE_PREFIX: 1215 ret = score->matchlen; 1216 break; 1217 default: 1218 ret = !!test_bit(i, score->scorebits); 1219 } 1220 goto out; 1221 } 1222 1223 switch (i) { 1224 case IPV6_SADDR_RULE_INIT: 1225 /* Rule 0: remember if hiscore is not ready yet */ 1226 ret = !!score->ifa; 1227 break; 1228 case IPV6_SADDR_RULE_LOCAL: 1229 /* Rule 1: Prefer same address */ 1230 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr); 1231 break; 1232 case IPV6_SADDR_RULE_SCOPE: 1233 /* Rule 2: Prefer appropriate scope 1234 * 1235 * ret 1236 * ^ 1237 * -1 | d 15 1238 * ---+--+-+---> scope 1239 * | 1240 * | d is scope of the destination. 1241 * B-d | \ 1242 * | \ <- smaller scope is better if 1243 * B-15 | \ if scope is enough for destinaion. 1244 * | ret = B - scope (-1 <= scope >= d <= 15). 1245 * d-C-1 | / 1246 * |/ <- greater is better 1247 * -C / if scope is not enough for destination. 1248 * /| ret = scope - C (-1 <= d < scope <= 15). 1249 * 1250 * d - C - 1 < B -15 (for all -1 <= d <= 15). 1251 * C > d + 14 - B >= 15 + 14 - B = 29 - B. 1252 * Assume B = 0 and we get C > 29. 1253 */ 1254 ret = __ipv6_addr_src_scope(score->addr_type); 1255 if (ret >= dst->scope) 1256 ret = -ret; 1257 else 1258 ret -= 128; /* 30 is enough */ 1259 score->scopedist = ret; 1260 break; 1261 case IPV6_SADDR_RULE_PREFERRED: 1262 /* Rule 3: Avoid deprecated and optimistic addresses */ 1263 ret = ipv6_saddr_preferred(score->addr_type) || 1264 !(score->ifa->flags & (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC)); 1265 break; 1266 #ifdef CONFIG_IPV6_MIP6 1267 case IPV6_SADDR_RULE_HOA: 1268 { 1269 /* Rule 4: Prefer home address */ 1270 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA); 1271 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome; 1272 break; 1273 } 1274 #endif 1275 case IPV6_SADDR_RULE_OIF: 1276 /* Rule 5: Prefer outgoing interface */ 1277 ret = (!dst->ifindex || 1278 dst->ifindex == score->ifa->idev->dev->ifindex); 1279 break; 1280 case IPV6_SADDR_RULE_LABEL: 1281 /* Rule 6: Prefer matching label */ 1282 ret = ipv6_addr_label(net, 1283 &score->ifa->addr, score->addr_type, 1284 score->ifa->idev->dev->ifindex) == dst->label; 1285 break; 1286 #ifdef CONFIG_IPV6_PRIVACY 1287 case IPV6_SADDR_RULE_PRIVACY: 1288 { 1289 /* Rule 7: Prefer public address 1290 * Note: prefer temporary address if use_tempaddr >= 2 1291 */ 1292 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ? 1293 !!(dst->prefs & IPV6_PREFER_SRC_TMP) : 1294 score->ifa->idev->cnf.use_tempaddr >= 2; 1295 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp; 1296 break; 1297 } 1298 #endif 1299 case IPV6_SADDR_RULE_ORCHID: 1300 /* Rule 8-: Prefer ORCHID vs ORCHID or 1301 * non-ORCHID vs non-ORCHID 1302 */ 1303 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^ 1304 ipv6_addr_orchid(dst->addr)); 1305 break; 1306 case IPV6_SADDR_RULE_PREFIX: 1307 /* Rule 8: Use longest matching prefix */ 1308 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr); 1309 if (ret > score->ifa->prefix_len) 1310 ret = score->ifa->prefix_len; 1311 score->matchlen = ret; 1312 break; 1313 default: 1314 ret = 0; 1315 } 1316 1317 if (ret) 1318 __set_bit(i, score->scorebits); 1319 score->rule = i; 1320 out: 1321 return ret; 1322 } 1323 1324 int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev, 1325 const struct in6_addr *daddr, unsigned int prefs, 1326 struct in6_addr *saddr) 1327 { 1328 struct ipv6_saddr_score scores[2], 1329 *score = &scores[0], *hiscore = &scores[1]; 1330 struct ipv6_saddr_dst dst; 1331 struct net_device *dev; 1332 int dst_type; 1333 1334 dst_type = __ipv6_addr_type(daddr); 1335 dst.addr = daddr; 1336 dst.ifindex = dst_dev ? dst_dev->ifindex : 0; 1337 dst.scope = __ipv6_addr_src_scope(dst_type); 1338 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex); 1339 dst.prefs = prefs; 1340 1341 hiscore->rule = -1; 1342 hiscore->ifa = NULL; 1343 1344 rcu_read_lock(); 1345 1346 for_each_netdev_rcu(net, dev) { 1347 struct inet6_dev *idev; 1348 1349 /* Candidate Source Address (section 4) 1350 * - multicast and link-local destination address, 1351 * the set of candidate source address MUST only 1352 * include addresses assigned to interfaces 1353 * belonging to the same link as the outgoing 1354 * interface. 1355 * (- For site-local destination addresses, the 1356 * set of candidate source addresses MUST only 1357 * include addresses assigned to interfaces 1358 * belonging to the same site as the outgoing 1359 * interface.) 1360 */ 1361 if (((dst_type & IPV6_ADDR_MULTICAST) || 1362 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL) && 1363 dst.ifindex && dev->ifindex != dst.ifindex) 1364 continue; 1365 1366 idev = __in6_dev_get(dev); 1367 if (!idev) 1368 continue; 1369 1370 read_lock_bh(&idev->lock); 1371 list_for_each_entry(score->ifa, &idev->addr_list, if_list) { 1372 int i; 1373 1374 /* 1375 * - Tentative Address (RFC2462 section 5.4) 1376 * - A tentative address is not considered 1377 * "assigned to an interface" in the traditional 1378 * sense, unless it is also flagged as optimistic. 1379 * - Candidate Source Address (section 4) 1380 * - In any case, anycast addresses, multicast 1381 * addresses, and the unspecified address MUST 1382 * NOT be included in a candidate set. 1383 */ 1384 if ((score->ifa->flags & IFA_F_TENTATIVE) && 1385 (!(score->ifa->flags & IFA_F_OPTIMISTIC))) 1386 continue; 1387 1388 score->addr_type = __ipv6_addr_type(&score->ifa->addr); 1389 1390 if (unlikely(score->addr_type == IPV6_ADDR_ANY || 1391 score->addr_type & IPV6_ADDR_MULTICAST)) { 1392 LIMIT_NETDEBUG(KERN_DEBUG 1393 "ADDRCONF: unspecified / multicast address " 1394 "assigned as unicast address on %s", 1395 dev->name); 1396 continue; 1397 } 1398 1399 score->rule = -1; 1400 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX); 1401 1402 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) { 1403 int minihiscore, miniscore; 1404 1405 minihiscore = ipv6_get_saddr_eval(net, hiscore, &dst, i); 1406 miniscore = ipv6_get_saddr_eval(net, score, &dst, i); 1407 1408 if (minihiscore > miniscore) { 1409 if (i == IPV6_SADDR_RULE_SCOPE && 1410 score->scopedist > 0) { 1411 /* 1412 * special case: 1413 * each remaining entry 1414 * has too small (not enough) 1415 * scope, because ifa entries 1416 * are sorted by their scope 1417 * values. 1418 */ 1419 goto try_nextdev; 1420 } 1421 break; 1422 } else if (minihiscore < miniscore) { 1423 if (hiscore->ifa) 1424 in6_ifa_put(hiscore->ifa); 1425 1426 in6_ifa_hold(score->ifa); 1427 1428 swap(hiscore, score); 1429 1430 /* restore our iterator */ 1431 score->ifa = hiscore->ifa; 1432 1433 break; 1434 } 1435 } 1436 } 1437 try_nextdev: 1438 read_unlock_bh(&idev->lock); 1439 } 1440 rcu_read_unlock(); 1441 1442 if (!hiscore->ifa) 1443 return -EADDRNOTAVAIL; 1444 1445 *saddr = hiscore->ifa->addr; 1446 in6_ifa_put(hiscore->ifa); 1447 return 0; 1448 } 1449 EXPORT_SYMBOL(ipv6_dev_get_saddr); 1450 1451 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr, 1452 unsigned char banned_flags) 1453 { 1454 struct inet6_dev *idev; 1455 int err = -EADDRNOTAVAIL; 1456 1457 rcu_read_lock(); 1458 idev = __in6_dev_get(dev); 1459 if (idev) { 1460 struct inet6_ifaddr *ifp; 1461 1462 read_lock_bh(&idev->lock); 1463 list_for_each_entry(ifp, &idev->addr_list, if_list) { 1464 if (ifp->scope == IFA_LINK && 1465 !(ifp->flags & banned_flags)) { 1466 *addr = ifp->addr; 1467 err = 0; 1468 break; 1469 } 1470 } 1471 read_unlock_bh(&idev->lock); 1472 } 1473 rcu_read_unlock(); 1474 return err; 1475 } 1476 1477 static int ipv6_count_addresses(struct inet6_dev *idev) 1478 { 1479 int cnt = 0; 1480 struct inet6_ifaddr *ifp; 1481 1482 read_lock_bh(&idev->lock); 1483 list_for_each_entry(ifp, &idev->addr_list, if_list) 1484 cnt++; 1485 read_unlock_bh(&idev->lock); 1486 return cnt; 1487 } 1488 1489 int ipv6_chk_addr(struct net *net, const struct in6_addr *addr, 1490 struct net_device *dev, int strict) 1491 { 1492 struct inet6_ifaddr *ifp; 1493 unsigned int hash = inet6_addr_hash(addr); 1494 1495 rcu_read_lock_bh(); 1496 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) { 1497 if (!net_eq(dev_net(ifp->idev->dev), net)) 1498 continue; 1499 if (ipv6_addr_equal(&ifp->addr, addr) && 1500 !(ifp->flags&IFA_F_TENTATIVE) && 1501 (dev == NULL || ifp->idev->dev == dev || 1502 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) { 1503 rcu_read_unlock_bh(); 1504 return 1; 1505 } 1506 } 1507 1508 rcu_read_unlock_bh(); 1509 return 0; 1510 } 1511 EXPORT_SYMBOL(ipv6_chk_addr); 1512 1513 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr, 1514 struct net_device *dev) 1515 { 1516 unsigned int hash = inet6_addr_hash(addr); 1517 struct inet6_ifaddr *ifp; 1518 1519 hlist_for_each_entry(ifp, &inet6_addr_lst[hash], addr_lst) { 1520 if (!net_eq(dev_net(ifp->idev->dev), net)) 1521 continue; 1522 if (ipv6_addr_equal(&ifp->addr, addr)) { 1523 if (dev == NULL || ifp->idev->dev == dev) 1524 return true; 1525 } 1526 } 1527 return false; 1528 } 1529 1530 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev) 1531 { 1532 struct inet6_dev *idev; 1533 struct inet6_ifaddr *ifa; 1534 int onlink; 1535 1536 onlink = 0; 1537 rcu_read_lock(); 1538 idev = __in6_dev_get(dev); 1539 if (idev) { 1540 read_lock_bh(&idev->lock); 1541 list_for_each_entry(ifa, &idev->addr_list, if_list) { 1542 onlink = ipv6_prefix_equal(addr, &ifa->addr, 1543 ifa->prefix_len); 1544 if (onlink) 1545 break; 1546 } 1547 read_unlock_bh(&idev->lock); 1548 } 1549 rcu_read_unlock(); 1550 return onlink; 1551 } 1552 EXPORT_SYMBOL(ipv6_chk_prefix); 1553 1554 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr, 1555 struct net_device *dev, int strict) 1556 { 1557 struct inet6_ifaddr *ifp, *result = NULL; 1558 unsigned int hash = inet6_addr_hash(addr); 1559 1560 rcu_read_lock_bh(); 1561 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) { 1562 if (!net_eq(dev_net(ifp->idev->dev), net)) 1563 continue; 1564 if (ipv6_addr_equal(&ifp->addr, addr)) { 1565 if (dev == NULL || ifp->idev->dev == dev || 1566 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) { 1567 result = ifp; 1568 in6_ifa_hold(ifp); 1569 break; 1570 } 1571 } 1572 } 1573 rcu_read_unlock_bh(); 1574 1575 return result; 1576 } 1577 1578 /* Gets referenced address, destroys ifaddr */ 1579 1580 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed) 1581 { 1582 if (ifp->flags&IFA_F_PERMANENT) { 1583 spin_lock_bh(&ifp->lock); 1584 addrconf_del_timer(ifp); 1585 ifp->flags |= IFA_F_TENTATIVE; 1586 if (dad_failed) 1587 ifp->flags |= IFA_F_DADFAILED; 1588 spin_unlock_bh(&ifp->lock); 1589 if (dad_failed) 1590 ipv6_ifa_notify(0, ifp); 1591 in6_ifa_put(ifp); 1592 #ifdef CONFIG_IPV6_PRIVACY 1593 } else if (ifp->flags&IFA_F_TEMPORARY) { 1594 struct inet6_ifaddr *ifpub; 1595 spin_lock_bh(&ifp->lock); 1596 ifpub = ifp->ifpub; 1597 if (ifpub) { 1598 in6_ifa_hold(ifpub); 1599 spin_unlock_bh(&ifp->lock); 1600 ipv6_create_tempaddr(ifpub, ifp); 1601 in6_ifa_put(ifpub); 1602 } else { 1603 spin_unlock_bh(&ifp->lock); 1604 } 1605 ipv6_del_addr(ifp); 1606 #endif 1607 } else 1608 ipv6_del_addr(ifp); 1609 } 1610 1611 static int addrconf_dad_end(struct inet6_ifaddr *ifp) 1612 { 1613 int err = -ENOENT; 1614 1615 spin_lock(&ifp->state_lock); 1616 if (ifp->state == INET6_IFADDR_STATE_DAD) { 1617 ifp->state = INET6_IFADDR_STATE_POSTDAD; 1618 err = 0; 1619 } 1620 spin_unlock(&ifp->state_lock); 1621 1622 return err; 1623 } 1624 1625 void addrconf_dad_failure(struct inet6_ifaddr *ifp) 1626 { 1627 struct inet6_dev *idev = ifp->idev; 1628 1629 if (addrconf_dad_end(ifp)) { 1630 in6_ifa_put(ifp); 1631 return; 1632 } 1633 1634 net_info_ratelimited("%s: IPv6 duplicate address %pI6c detected!\n", 1635 ifp->idev->dev->name, &ifp->addr); 1636 1637 if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6) { 1638 struct in6_addr addr; 1639 1640 addr.s6_addr32[0] = htonl(0xfe800000); 1641 addr.s6_addr32[1] = 0; 1642 1643 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) && 1644 ipv6_addr_equal(&ifp->addr, &addr)) { 1645 /* DAD failed for link-local based on MAC address */ 1646 idev->cnf.disable_ipv6 = 1; 1647 1648 pr_info("%s: IPv6 being disabled!\n", 1649 ifp->idev->dev->name); 1650 } 1651 } 1652 1653 addrconf_dad_stop(ifp, 1); 1654 } 1655 1656 /* Join to solicited addr multicast group. */ 1657 1658 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr) 1659 { 1660 struct in6_addr maddr; 1661 1662 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP)) 1663 return; 1664 1665 addrconf_addr_solict_mult(addr, &maddr); 1666 ipv6_dev_mc_inc(dev, &maddr); 1667 } 1668 1669 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr) 1670 { 1671 struct in6_addr maddr; 1672 1673 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP)) 1674 return; 1675 1676 addrconf_addr_solict_mult(addr, &maddr); 1677 __ipv6_dev_mc_dec(idev, &maddr); 1678 } 1679 1680 static void addrconf_join_anycast(struct inet6_ifaddr *ifp) 1681 { 1682 struct in6_addr addr; 1683 if (ifp->prefix_len == 127) /* RFC 6164 */ 1684 return; 1685 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len); 1686 if (ipv6_addr_any(&addr)) 1687 return; 1688 ipv6_dev_ac_inc(ifp->idev->dev, &addr); 1689 } 1690 1691 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp) 1692 { 1693 struct in6_addr addr; 1694 if (ifp->prefix_len == 127) /* RFC 6164 */ 1695 return; 1696 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len); 1697 if (ipv6_addr_any(&addr)) 1698 return; 1699 __ipv6_dev_ac_dec(ifp->idev, &addr); 1700 } 1701 1702 static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev) 1703 { 1704 if (dev->addr_len != ETH_ALEN) 1705 return -1; 1706 memcpy(eui, dev->dev_addr, 3); 1707 memcpy(eui + 5, dev->dev_addr + 3, 3); 1708 1709 /* 1710 * The zSeries OSA network cards can be shared among various 1711 * OS instances, but the OSA cards have only one MAC address. 1712 * This leads to duplicate address conflicts in conjunction 1713 * with IPv6 if more than one instance uses the same card. 1714 * 1715 * The driver for these cards can deliver a unique 16-bit 1716 * identifier for each instance sharing the same card. It is 1717 * placed instead of 0xFFFE in the interface identifier. The 1718 * "u" bit of the interface identifier is not inverted in this 1719 * case. Hence the resulting interface identifier has local 1720 * scope according to RFC2373. 1721 */ 1722 if (dev->dev_id) { 1723 eui[3] = (dev->dev_id >> 8) & 0xFF; 1724 eui[4] = dev->dev_id & 0xFF; 1725 } else { 1726 eui[3] = 0xFF; 1727 eui[4] = 0xFE; 1728 eui[0] ^= 2; 1729 } 1730 return 0; 1731 } 1732 1733 static int addrconf_ifid_eui64(u8 *eui, struct net_device *dev) 1734 { 1735 if (dev->addr_len != IEEE802154_ADDR_LEN) 1736 return -1; 1737 memcpy(eui, dev->dev_addr, 8); 1738 eui[0] ^= 2; 1739 return 0; 1740 } 1741 1742 static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev) 1743 { 1744 union fwnet_hwaddr *ha; 1745 1746 if (dev->addr_len != FWNET_ALEN) 1747 return -1; 1748 1749 ha = (union fwnet_hwaddr *)dev->dev_addr; 1750 1751 memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id)); 1752 eui[0] ^= 2; 1753 return 0; 1754 } 1755 1756 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev) 1757 { 1758 /* XXX: inherit EUI-64 from other interface -- yoshfuji */ 1759 if (dev->addr_len != ARCNET_ALEN) 1760 return -1; 1761 memset(eui, 0, 7); 1762 eui[7] = *(u8 *)dev->dev_addr; 1763 return 0; 1764 } 1765 1766 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev) 1767 { 1768 if (dev->addr_len != INFINIBAND_ALEN) 1769 return -1; 1770 memcpy(eui, dev->dev_addr + 12, 8); 1771 eui[0] |= 2; 1772 return 0; 1773 } 1774 1775 static int __ipv6_isatap_ifid(u8 *eui, __be32 addr) 1776 { 1777 if (addr == 0) 1778 return -1; 1779 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) || 1780 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) || 1781 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) || 1782 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) || 1783 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) || 1784 ipv4_is_lbcast(addr)) ? 0x00 : 0x02; 1785 eui[1] = 0; 1786 eui[2] = 0x5E; 1787 eui[3] = 0xFE; 1788 memcpy(eui + 4, &addr, 4); 1789 return 0; 1790 } 1791 1792 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev) 1793 { 1794 if (dev->priv_flags & IFF_ISATAP) 1795 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr); 1796 return -1; 1797 } 1798 1799 static int addrconf_ifid_gre(u8 *eui, struct net_device *dev) 1800 { 1801 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr); 1802 } 1803 1804 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev) 1805 { 1806 switch (dev->type) { 1807 case ARPHRD_ETHER: 1808 case ARPHRD_FDDI: 1809 return addrconf_ifid_eui48(eui, dev); 1810 case ARPHRD_ARCNET: 1811 return addrconf_ifid_arcnet(eui, dev); 1812 case ARPHRD_INFINIBAND: 1813 return addrconf_ifid_infiniband(eui, dev); 1814 case ARPHRD_SIT: 1815 return addrconf_ifid_sit(eui, dev); 1816 case ARPHRD_IPGRE: 1817 return addrconf_ifid_gre(eui, dev); 1818 case ARPHRD_IEEE802154: 1819 return addrconf_ifid_eui64(eui, dev); 1820 case ARPHRD_IEEE1394: 1821 return addrconf_ifid_ieee1394(eui, dev); 1822 } 1823 return -1; 1824 } 1825 1826 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev) 1827 { 1828 int err = -1; 1829 struct inet6_ifaddr *ifp; 1830 1831 read_lock_bh(&idev->lock); 1832 list_for_each_entry(ifp, &idev->addr_list, if_list) { 1833 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) { 1834 memcpy(eui, ifp->addr.s6_addr+8, 8); 1835 err = 0; 1836 break; 1837 } 1838 } 1839 read_unlock_bh(&idev->lock); 1840 return err; 1841 } 1842 1843 #ifdef CONFIG_IPV6_PRIVACY 1844 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */ 1845 static void __ipv6_regen_rndid(struct inet6_dev *idev) 1846 { 1847 regen: 1848 get_random_bytes(idev->rndid, sizeof(idev->rndid)); 1849 idev->rndid[0] &= ~0x02; 1850 1851 /* 1852 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>: 1853 * check if generated address is not inappropriate 1854 * 1855 * - Reserved subnet anycast (RFC 2526) 1856 * 11111101 11....11 1xxxxxxx 1857 * - ISATAP (RFC4214) 6.1 1858 * 00-00-5E-FE-xx-xx-xx-xx 1859 * - value 0 1860 * - XXX: already assigned to an address on the device 1861 */ 1862 if (idev->rndid[0] == 0xfd && 1863 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff && 1864 (idev->rndid[7]&0x80)) 1865 goto regen; 1866 if ((idev->rndid[0]|idev->rndid[1]) == 0) { 1867 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe) 1868 goto regen; 1869 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00) 1870 goto regen; 1871 } 1872 } 1873 1874 static void ipv6_regen_rndid(unsigned long data) 1875 { 1876 struct inet6_dev *idev = (struct inet6_dev *) data; 1877 unsigned long expires; 1878 1879 rcu_read_lock_bh(); 1880 write_lock_bh(&idev->lock); 1881 1882 if (idev->dead) 1883 goto out; 1884 1885 __ipv6_regen_rndid(idev); 1886 1887 expires = jiffies + 1888 idev->cnf.temp_prefered_lft * HZ - 1889 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time - 1890 idev->cnf.max_desync_factor * HZ; 1891 if (time_before(expires, jiffies)) { 1892 pr_warn("%s: too short regeneration interval; timer disabled for %s\n", 1893 __func__, idev->dev->name); 1894 goto out; 1895 } 1896 1897 if (!mod_timer(&idev->regen_timer, expires)) 1898 in6_dev_hold(idev); 1899 1900 out: 1901 write_unlock_bh(&idev->lock); 1902 rcu_read_unlock_bh(); 1903 in6_dev_put(idev); 1904 } 1905 1906 static void __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) 1907 { 1908 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0) 1909 __ipv6_regen_rndid(idev); 1910 } 1911 #endif 1912 1913 /* 1914 * Add prefix route. 1915 */ 1916 1917 static void 1918 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev, 1919 unsigned long expires, u32 flags) 1920 { 1921 struct fib6_config cfg = { 1922 .fc_table = RT6_TABLE_PREFIX, 1923 .fc_metric = IP6_RT_PRIO_ADDRCONF, 1924 .fc_ifindex = dev->ifindex, 1925 .fc_expires = expires, 1926 .fc_dst_len = plen, 1927 .fc_flags = RTF_UP | flags, 1928 .fc_nlinfo.nl_net = dev_net(dev), 1929 .fc_protocol = RTPROT_KERNEL, 1930 }; 1931 1932 cfg.fc_dst = *pfx; 1933 1934 /* Prevent useless cloning on PtP SIT. 1935 This thing is done here expecting that the whole 1936 class of non-broadcast devices need not cloning. 1937 */ 1938 #if IS_ENABLED(CONFIG_IPV6_SIT) 1939 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT)) 1940 cfg.fc_flags |= RTF_NONEXTHOP; 1941 #endif 1942 1943 ip6_route_add(&cfg); 1944 } 1945 1946 1947 static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx, 1948 int plen, 1949 const struct net_device *dev, 1950 u32 flags, u32 noflags) 1951 { 1952 struct fib6_node *fn; 1953 struct rt6_info *rt = NULL; 1954 struct fib6_table *table; 1955 1956 table = fib6_get_table(dev_net(dev), RT6_TABLE_PREFIX); 1957 if (table == NULL) 1958 return NULL; 1959 1960 read_lock_bh(&table->tb6_lock); 1961 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0); 1962 if (!fn) 1963 goto out; 1964 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) { 1965 if (rt->dst.dev->ifindex != dev->ifindex) 1966 continue; 1967 if ((rt->rt6i_flags & flags) != flags) 1968 continue; 1969 if ((rt->rt6i_flags & noflags) != 0) 1970 continue; 1971 dst_hold(&rt->dst); 1972 break; 1973 } 1974 out: 1975 read_unlock_bh(&table->tb6_lock); 1976 return rt; 1977 } 1978 1979 1980 /* Create "default" multicast route to the interface */ 1981 1982 static void addrconf_add_mroute(struct net_device *dev) 1983 { 1984 struct fib6_config cfg = { 1985 .fc_table = RT6_TABLE_LOCAL, 1986 .fc_metric = IP6_RT_PRIO_ADDRCONF, 1987 .fc_ifindex = dev->ifindex, 1988 .fc_dst_len = 8, 1989 .fc_flags = RTF_UP, 1990 .fc_nlinfo.nl_net = dev_net(dev), 1991 }; 1992 1993 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0); 1994 1995 ip6_route_add(&cfg); 1996 } 1997 1998 #if IS_ENABLED(CONFIG_IPV6_SIT) 1999 static void sit_route_add(struct net_device *dev) 2000 { 2001 struct fib6_config cfg = { 2002 .fc_table = RT6_TABLE_MAIN, 2003 .fc_metric = IP6_RT_PRIO_ADDRCONF, 2004 .fc_ifindex = dev->ifindex, 2005 .fc_dst_len = 96, 2006 .fc_flags = RTF_UP | RTF_NONEXTHOP, 2007 .fc_nlinfo.nl_net = dev_net(dev), 2008 }; 2009 2010 /* prefix length - 96 bits "::d.d.d.d" */ 2011 ip6_route_add(&cfg); 2012 } 2013 #endif 2014 2015 static struct inet6_dev *addrconf_add_dev(struct net_device *dev) 2016 { 2017 struct inet6_dev *idev; 2018 2019 ASSERT_RTNL(); 2020 2021 idev = ipv6_find_idev(dev); 2022 if (!idev) 2023 return ERR_PTR(-ENOBUFS); 2024 2025 if (idev->cnf.disable_ipv6) 2026 return ERR_PTR(-EACCES); 2027 2028 /* Add default multicast route */ 2029 if (!(dev->flags & IFF_LOOPBACK)) 2030 addrconf_add_mroute(dev); 2031 2032 return idev; 2033 } 2034 2035 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao) 2036 { 2037 struct prefix_info *pinfo; 2038 __u32 valid_lft; 2039 __u32 prefered_lft; 2040 int addr_type; 2041 struct inet6_dev *in6_dev; 2042 struct net *net = dev_net(dev); 2043 2044 pinfo = (struct prefix_info *) opt; 2045 2046 if (len < sizeof(struct prefix_info)) { 2047 ADBG(("addrconf: prefix option too short\n")); 2048 return; 2049 } 2050 2051 /* 2052 * Validation checks ([ADDRCONF], page 19) 2053 */ 2054 2055 addr_type = ipv6_addr_type(&pinfo->prefix); 2056 2057 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL)) 2058 return; 2059 2060 valid_lft = ntohl(pinfo->valid); 2061 prefered_lft = ntohl(pinfo->prefered); 2062 2063 if (prefered_lft > valid_lft) { 2064 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n"); 2065 return; 2066 } 2067 2068 in6_dev = in6_dev_get(dev); 2069 2070 if (in6_dev == NULL) { 2071 net_dbg_ratelimited("addrconf: device %s not configured\n", 2072 dev->name); 2073 return; 2074 } 2075 2076 /* 2077 * Two things going on here: 2078 * 1) Add routes for on-link prefixes 2079 * 2) Configure prefixes with the auto flag set 2080 */ 2081 2082 if (pinfo->onlink) { 2083 struct rt6_info *rt; 2084 unsigned long rt_expires; 2085 2086 /* Avoid arithmetic overflow. Really, we could 2087 * save rt_expires in seconds, likely valid_lft, 2088 * but it would require division in fib gc, that it 2089 * not good. 2090 */ 2091 if (HZ > USER_HZ) 2092 rt_expires = addrconf_timeout_fixup(valid_lft, HZ); 2093 else 2094 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ); 2095 2096 if (addrconf_finite_timeout(rt_expires)) 2097 rt_expires *= HZ; 2098 2099 rt = addrconf_get_prefix_route(&pinfo->prefix, 2100 pinfo->prefix_len, 2101 dev, 2102 RTF_ADDRCONF | RTF_PREFIX_RT, 2103 RTF_GATEWAY | RTF_DEFAULT); 2104 2105 if (rt) { 2106 /* Autoconf prefix route */ 2107 if (valid_lft == 0) { 2108 ip6_del_rt(rt); 2109 rt = NULL; 2110 } else if (addrconf_finite_timeout(rt_expires)) { 2111 /* not infinity */ 2112 rt6_set_expires(rt, jiffies + rt_expires); 2113 } else { 2114 rt6_clean_expires(rt); 2115 } 2116 } else if (valid_lft) { 2117 clock_t expires = 0; 2118 int flags = RTF_ADDRCONF | RTF_PREFIX_RT; 2119 if (addrconf_finite_timeout(rt_expires)) { 2120 /* not infinity */ 2121 flags |= RTF_EXPIRES; 2122 expires = jiffies_to_clock_t(rt_expires); 2123 } 2124 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len, 2125 dev, expires, flags); 2126 } 2127 ip6_rt_put(rt); 2128 } 2129 2130 /* Try to figure out our local address for this prefix */ 2131 2132 if (pinfo->autoconf && in6_dev->cnf.autoconf) { 2133 struct inet6_ifaddr *ifp; 2134 struct in6_addr addr; 2135 int create = 0, update_lft = 0; 2136 bool tokenized = false; 2137 2138 if (pinfo->prefix_len == 64) { 2139 memcpy(&addr, &pinfo->prefix, 8); 2140 2141 if (!ipv6_addr_any(&in6_dev->token)) { 2142 read_lock_bh(&in6_dev->lock); 2143 memcpy(addr.s6_addr + 8, 2144 in6_dev->token.s6_addr + 8, 8); 2145 read_unlock_bh(&in6_dev->lock); 2146 tokenized = true; 2147 } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) && 2148 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) { 2149 in6_dev_put(in6_dev); 2150 return; 2151 } 2152 goto ok; 2153 } 2154 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n", 2155 pinfo->prefix_len); 2156 in6_dev_put(in6_dev); 2157 return; 2158 2159 ok: 2160 2161 ifp = ipv6_get_ifaddr(net, &addr, dev, 1); 2162 2163 if (ifp == NULL && valid_lft) { 2164 int max_addresses = in6_dev->cnf.max_addresses; 2165 u32 addr_flags = 0; 2166 2167 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 2168 if (in6_dev->cnf.optimistic_dad && 2169 !net->ipv6.devconf_all->forwarding && sllao) 2170 addr_flags = IFA_F_OPTIMISTIC; 2171 #endif 2172 2173 /* Do not allow to create too much of autoconfigured 2174 * addresses; this would be too easy way to crash kernel. 2175 */ 2176 if (!max_addresses || 2177 ipv6_count_addresses(in6_dev) < max_addresses) 2178 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len, 2179 addr_type&IPV6_ADDR_SCOPE_MASK, 2180 addr_flags); 2181 2182 if (IS_ERR_OR_NULL(ifp)) { 2183 in6_dev_put(in6_dev); 2184 return; 2185 } 2186 2187 update_lft = create = 1; 2188 ifp->cstamp = jiffies; 2189 ifp->tokenized = tokenized; 2190 addrconf_dad_start(ifp); 2191 } 2192 2193 if (ifp) { 2194 int flags; 2195 unsigned long now; 2196 #ifdef CONFIG_IPV6_PRIVACY 2197 struct inet6_ifaddr *ift; 2198 #endif 2199 u32 stored_lft; 2200 2201 /* update lifetime (RFC2462 5.5.3 e) */ 2202 spin_lock(&ifp->lock); 2203 now = jiffies; 2204 if (ifp->valid_lft > (now - ifp->tstamp) / HZ) 2205 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ; 2206 else 2207 stored_lft = 0; 2208 if (!update_lft && stored_lft) { 2209 if (valid_lft > MIN_VALID_LIFETIME || 2210 valid_lft > stored_lft) 2211 update_lft = 1; 2212 else if (stored_lft <= MIN_VALID_LIFETIME) { 2213 /* valid_lft <= stored_lft is always true */ 2214 /* 2215 * RFC 4862 Section 5.5.3e: 2216 * "Note that the preferred lifetime of 2217 * the corresponding address is always 2218 * reset to the Preferred Lifetime in 2219 * the received Prefix Information 2220 * option, regardless of whether the 2221 * valid lifetime is also reset or 2222 * ignored." 2223 * 2224 * So if the preferred lifetime in 2225 * this advertisement is different 2226 * than what we have stored, but the 2227 * valid lifetime is invalid, just 2228 * reset prefered_lft. 2229 * 2230 * We must set the valid lifetime 2231 * to the stored lifetime since we'll 2232 * be updating the timestamp below, 2233 * else we'll set it back to the 2234 * minimum. 2235 */ 2236 if (prefered_lft != ifp->prefered_lft) { 2237 valid_lft = stored_lft; 2238 update_lft = 1; 2239 } 2240 } else { 2241 valid_lft = MIN_VALID_LIFETIME; 2242 if (valid_lft < prefered_lft) 2243 prefered_lft = valid_lft; 2244 update_lft = 1; 2245 } 2246 } 2247 2248 if (update_lft) { 2249 ifp->valid_lft = valid_lft; 2250 ifp->prefered_lft = prefered_lft; 2251 ifp->tstamp = now; 2252 flags = ifp->flags; 2253 ifp->flags &= ~IFA_F_DEPRECATED; 2254 spin_unlock(&ifp->lock); 2255 2256 if (!(flags&IFA_F_TENTATIVE)) 2257 ipv6_ifa_notify(0, ifp); 2258 } else 2259 spin_unlock(&ifp->lock); 2260 2261 #ifdef CONFIG_IPV6_PRIVACY 2262 read_lock_bh(&in6_dev->lock); 2263 /* update all temporary addresses in the list */ 2264 list_for_each_entry(ift, &in6_dev->tempaddr_list, 2265 tmp_list) { 2266 int age, max_valid, max_prefered; 2267 2268 if (ifp != ift->ifpub) 2269 continue; 2270 2271 /* 2272 * RFC 4941 section 3.3: 2273 * If a received option will extend the lifetime 2274 * of a public address, the lifetimes of 2275 * temporary addresses should be extended, 2276 * subject to the overall constraint that no 2277 * temporary addresses should ever remain 2278 * "valid" or "preferred" for a time longer than 2279 * (TEMP_VALID_LIFETIME) or 2280 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), 2281 * respectively. 2282 */ 2283 age = (now - ift->cstamp) / HZ; 2284 max_valid = in6_dev->cnf.temp_valid_lft - age; 2285 if (max_valid < 0) 2286 max_valid = 0; 2287 2288 max_prefered = in6_dev->cnf.temp_prefered_lft - 2289 in6_dev->cnf.max_desync_factor - 2290 age; 2291 if (max_prefered < 0) 2292 max_prefered = 0; 2293 2294 if (valid_lft > max_valid) 2295 valid_lft = max_valid; 2296 2297 if (prefered_lft > max_prefered) 2298 prefered_lft = max_prefered; 2299 2300 spin_lock(&ift->lock); 2301 flags = ift->flags; 2302 ift->valid_lft = valid_lft; 2303 ift->prefered_lft = prefered_lft; 2304 ift->tstamp = now; 2305 if (prefered_lft > 0) 2306 ift->flags &= ~IFA_F_DEPRECATED; 2307 2308 spin_unlock(&ift->lock); 2309 if (!(flags&IFA_F_TENTATIVE)) 2310 ipv6_ifa_notify(0, ift); 2311 } 2312 2313 if ((create || list_empty(&in6_dev->tempaddr_list)) && in6_dev->cnf.use_tempaddr > 0) { 2314 /* 2315 * When a new public address is created as 2316 * described in [ADDRCONF], also create a new 2317 * temporary address. Also create a temporary 2318 * address if it's enabled but no temporary 2319 * address currently exists. 2320 */ 2321 read_unlock_bh(&in6_dev->lock); 2322 ipv6_create_tempaddr(ifp, NULL); 2323 } else { 2324 read_unlock_bh(&in6_dev->lock); 2325 } 2326 #endif 2327 in6_ifa_put(ifp); 2328 addrconf_verify(0); 2329 } 2330 } 2331 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo); 2332 in6_dev_put(in6_dev); 2333 } 2334 2335 /* 2336 * Set destination address. 2337 * Special case for SIT interfaces where we create a new "virtual" 2338 * device. 2339 */ 2340 int addrconf_set_dstaddr(struct net *net, void __user *arg) 2341 { 2342 struct in6_ifreq ireq; 2343 struct net_device *dev; 2344 int err = -EINVAL; 2345 2346 rtnl_lock(); 2347 2348 err = -EFAULT; 2349 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2350 goto err_exit; 2351 2352 dev = __dev_get_by_index(net, ireq.ifr6_ifindex); 2353 2354 err = -ENODEV; 2355 if (dev == NULL) 2356 goto err_exit; 2357 2358 #if IS_ENABLED(CONFIG_IPV6_SIT) 2359 if (dev->type == ARPHRD_SIT) { 2360 const struct net_device_ops *ops = dev->netdev_ops; 2361 struct ifreq ifr; 2362 struct ip_tunnel_parm p; 2363 2364 err = -EADDRNOTAVAIL; 2365 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4)) 2366 goto err_exit; 2367 2368 memset(&p, 0, sizeof(p)); 2369 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3]; 2370 p.iph.saddr = 0; 2371 p.iph.version = 4; 2372 p.iph.ihl = 5; 2373 p.iph.protocol = IPPROTO_IPV6; 2374 p.iph.ttl = 64; 2375 ifr.ifr_ifru.ifru_data = (__force void __user *)&p; 2376 2377 if (ops->ndo_do_ioctl) { 2378 mm_segment_t oldfs = get_fs(); 2379 2380 set_fs(KERNEL_DS); 2381 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL); 2382 set_fs(oldfs); 2383 } else 2384 err = -EOPNOTSUPP; 2385 2386 if (err == 0) { 2387 err = -ENOBUFS; 2388 dev = __dev_get_by_name(net, p.name); 2389 if (!dev) 2390 goto err_exit; 2391 err = dev_open(dev); 2392 } 2393 } 2394 #endif 2395 2396 err_exit: 2397 rtnl_unlock(); 2398 return err; 2399 } 2400 2401 /* 2402 * Manual configuration of address on an interface 2403 */ 2404 static int inet6_addr_add(struct net *net, int ifindex, const struct in6_addr *pfx, 2405 unsigned int plen, __u8 ifa_flags, __u32 prefered_lft, 2406 __u32 valid_lft) 2407 { 2408 struct inet6_ifaddr *ifp; 2409 struct inet6_dev *idev; 2410 struct net_device *dev; 2411 int scope; 2412 u32 flags; 2413 clock_t expires; 2414 unsigned long timeout; 2415 2416 ASSERT_RTNL(); 2417 2418 if (plen > 128) 2419 return -EINVAL; 2420 2421 /* check the lifetime */ 2422 if (!valid_lft || prefered_lft > valid_lft) 2423 return -EINVAL; 2424 2425 dev = __dev_get_by_index(net, ifindex); 2426 if (!dev) 2427 return -ENODEV; 2428 2429 idev = addrconf_add_dev(dev); 2430 if (IS_ERR(idev)) 2431 return PTR_ERR(idev); 2432 2433 scope = ipv6_addr_scope(pfx); 2434 2435 timeout = addrconf_timeout_fixup(valid_lft, HZ); 2436 if (addrconf_finite_timeout(timeout)) { 2437 expires = jiffies_to_clock_t(timeout * HZ); 2438 valid_lft = timeout; 2439 flags = RTF_EXPIRES; 2440 } else { 2441 expires = 0; 2442 flags = 0; 2443 ifa_flags |= IFA_F_PERMANENT; 2444 } 2445 2446 timeout = addrconf_timeout_fixup(prefered_lft, HZ); 2447 if (addrconf_finite_timeout(timeout)) { 2448 if (timeout == 0) 2449 ifa_flags |= IFA_F_DEPRECATED; 2450 prefered_lft = timeout; 2451 } 2452 2453 ifp = ipv6_add_addr(idev, pfx, plen, scope, ifa_flags); 2454 2455 if (!IS_ERR(ifp)) { 2456 spin_lock_bh(&ifp->lock); 2457 ifp->valid_lft = valid_lft; 2458 ifp->prefered_lft = prefered_lft; 2459 ifp->tstamp = jiffies; 2460 spin_unlock_bh(&ifp->lock); 2461 2462 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev, 2463 expires, flags); 2464 /* 2465 * Note that section 3.1 of RFC 4429 indicates 2466 * that the Optimistic flag should not be set for 2467 * manually configured addresses 2468 */ 2469 addrconf_dad_start(ifp); 2470 in6_ifa_put(ifp); 2471 addrconf_verify(0); 2472 return 0; 2473 } 2474 2475 return PTR_ERR(ifp); 2476 } 2477 2478 static int inet6_addr_del(struct net *net, int ifindex, const struct in6_addr *pfx, 2479 unsigned int plen) 2480 { 2481 struct inet6_ifaddr *ifp; 2482 struct inet6_dev *idev; 2483 struct net_device *dev; 2484 2485 if (plen > 128) 2486 return -EINVAL; 2487 2488 dev = __dev_get_by_index(net, ifindex); 2489 if (!dev) 2490 return -ENODEV; 2491 2492 if ((idev = __in6_dev_get(dev)) == NULL) 2493 return -ENXIO; 2494 2495 read_lock_bh(&idev->lock); 2496 list_for_each_entry(ifp, &idev->addr_list, if_list) { 2497 if (ifp->prefix_len == plen && 2498 ipv6_addr_equal(pfx, &ifp->addr)) { 2499 in6_ifa_hold(ifp); 2500 read_unlock_bh(&idev->lock); 2501 2502 ipv6_del_addr(ifp); 2503 2504 /* If the last address is deleted administratively, 2505 disable IPv6 on this interface. 2506 */ 2507 if (list_empty(&idev->addr_list)) 2508 addrconf_ifdown(idev->dev, 1); 2509 return 0; 2510 } 2511 } 2512 read_unlock_bh(&idev->lock); 2513 return -EADDRNOTAVAIL; 2514 } 2515 2516 2517 int addrconf_add_ifaddr(struct net *net, void __user *arg) 2518 { 2519 struct in6_ifreq ireq; 2520 int err; 2521 2522 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 2523 return -EPERM; 2524 2525 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2526 return -EFAULT; 2527 2528 rtnl_lock(); 2529 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, 2530 ireq.ifr6_prefixlen, IFA_F_PERMANENT, 2531 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME); 2532 rtnl_unlock(); 2533 return err; 2534 } 2535 2536 int addrconf_del_ifaddr(struct net *net, void __user *arg) 2537 { 2538 struct in6_ifreq ireq; 2539 int err; 2540 2541 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 2542 return -EPERM; 2543 2544 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2545 return -EFAULT; 2546 2547 rtnl_lock(); 2548 err = inet6_addr_del(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, 2549 ireq.ifr6_prefixlen); 2550 rtnl_unlock(); 2551 return err; 2552 } 2553 2554 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr, 2555 int plen, int scope) 2556 { 2557 struct inet6_ifaddr *ifp; 2558 2559 ifp = ipv6_add_addr(idev, addr, plen, scope, IFA_F_PERMANENT); 2560 if (!IS_ERR(ifp)) { 2561 spin_lock_bh(&ifp->lock); 2562 ifp->flags &= ~IFA_F_TENTATIVE; 2563 spin_unlock_bh(&ifp->lock); 2564 ipv6_ifa_notify(RTM_NEWADDR, ifp); 2565 in6_ifa_put(ifp); 2566 } 2567 } 2568 2569 #if IS_ENABLED(CONFIG_IPV6_SIT) 2570 static void sit_add_v4_addrs(struct inet6_dev *idev) 2571 { 2572 struct in6_addr addr; 2573 struct net_device *dev; 2574 struct net *net = dev_net(idev->dev); 2575 int scope; 2576 2577 ASSERT_RTNL(); 2578 2579 memset(&addr, 0, sizeof(struct in6_addr)); 2580 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4); 2581 2582 if (idev->dev->flags&IFF_POINTOPOINT) { 2583 addr.s6_addr32[0] = htonl(0xfe800000); 2584 scope = IFA_LINK; 2585 } else { 2586 scope = IPV6_ADDR_COMPATv4; 2587 } 2588 2589 if (addr.s6_addr32[3]) { 2590 add_addr(idev, &addr, 128, scope); 2591 return; 2592 } 2593 2594 for_each_netdev(net, dev) { 2595 struct in_device *in_dev = __in_dev_get_rtnl(dev); 2596 if (in_dev && (dev->flags & IFF_UP)) { 2597 struct in_ifaddr *ifa; 2598 2599 int flag = scope; 2600 2601 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) { 2602 int plen; 2603 2604 addr.s6_addr32[3] = ifa->ifa_local; 2605 2606 if (ifa->ifa_scope == RT_SCOPE_LINK) 2607 continue; 2608 if (ifa->ifa_scope >= RT_SCOPE_HOST) { 2609 if (idev->dev->flags&IFF_POINTOPOINT) 2610 continue; 2611 flag |= IFA_HOST; 2612 } 2613 if (idev->dev->flags&IFF_POINTOPOINT) 2614 plen = 64; 2615 else 2616 plen = 96; 2617 2618 add_addr(idev, &addr, plen, flag); 2619 } 2620 } 2621 } 2622 } 2623 #endif 2624 2625 static void init_loopback(struct net_device *dev) 2626 { 2627 struct inet6_dev *idev; 2628 struct net_device *sp_dev; 2629 struct inet6_ifaddr *sp_ifa; 2630 struct rt6_info *sp_rt; 2631 2632 /* ::1 */ 2633 2634 ASSERT_RTNL(); 2635 2636 if ((idev = ipv6_find_idev(dev)) == NULL) { 2637 pr_debug("%s: add_dev failed\n", __func__); 2638 return; 2639 } 2640 2641 add_addr(idev, &in6addr_loopback, 128, IFA_HOST); 2642 2643 /* Add routes to other interface's IPv6 addresses */ 2644 for_each_netdev(dev_net(dev), sp_dev) { 2645 if (!strcmp(sp_dev->name, dev->name)) 2646 continue; 2647 2648 idev = __in6_dev_get(sp_dev); 2649 if (!idev) 2650 continue; 2651 2652 read_lock_bh(&idev->lock); 2653 list_for_each_entry(sp_ifa, &idev->addr_list, if_list) { 2654 2655 if (sp_ifa->flags & (IFA_F_DADFAILED | IFA_F_TENTATIVE)) 2656 continue; 2657 2658 sp_rt = addrconf_dst_alloc(idev, &sp_ifa->addr, 0); 2659 2660 /* Failure cases are ignored */ 2661 if (!IS_ERR(sp_rt)) 2662 ip6_ins_rt(sp_rt); 2663 } 2664 read_unlock_bh(&idev->lock); 2665 } 2666 } 2667 2668 static void addrconf_add_linklocal(struct inet6_dev *idev, const struct in6_addr *addr) 2669 { 2670 struct inet6_ifaddr *ifp; 2671 u32 addr_flags = IFA_F_PERMANENT; 2672 2673 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 2674 if (idev->cnf.optimistic_dad && 2675 !dev_net(idev->dev)->ipv6.devconf_all->forwarding) 2676 addr_flags |= IFA_F_OPTIMISTIC; 2677 #endif 2678 2679 2680 ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, addr_flags); 2681 if (!IS_ERR(ifp)) { 2682 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0); 2683 addrconf_dad_start(ifp); 2684 in6_ifa_put(ifp); 2685 } 2686 } 2687 2688 static void addrconf_dev_config(struct net_device *dev) 2689 { 2690 struct in6_addr addr; 2691 struct inet6_dev *idev; 2692 2693 ASSERT_RTNL(); 2694 2695 if ((dev->type != ARPHRD_ETHER) && 2696 (dev->type != ARPHRD_FDDI) && 2697 (dev->type != ARPHRD_ARCNET) && 2698 (dev->type != ARPHRD_INFINIBAND) && 2699 (dev->type != ARPHRD_IEEE802154) && 2700 (dev->type != ARPHRD_IEEE1394)) { 2701 /* Alas, we support only Ethernet autoconfiguration. */ 2702 return; 2703 } 2704 2705 idev = addrconf_add_dev(dev); 2706 if (IS_ERR(idev)) 2707 return; 2708 2709 memset(&addr, 0, sizeof(struct in6_addr)); 2710 addr.s6_addr32[0] = htonl(0xFE800000); 2711 2712 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0) 2713 addrconf_add_linklocal(idev, &addr); 2714 } 2715 2716 #if IS_ENABLED(CONFIG_IPV6_SIT) 2717 static void addrconf_sit_config(struct net_device *dev) 2718 { 2719 struct inet6_dev *idev; 2720 2721 ASSERT_RTNL(); 2722 2723 /* 2724 * Configure the tunnel with one of our IPv4 2725 * addresses... we should configure all of 2726 * our v4 addrs in the tunnel 2727 */ 2728 2729 if ((idev = ipv6_find_idev(dev)) == NULL) { 2730 pr_debug("%s: add_dev failed\n", __func__); 2731 return; 2732 } 2733 2734 if (dev->priv_flags & IFF_ISATAP) { 2735 struct in6_addr addr; 2736 2737 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0); 2738 addrconf_prefix_route(&addr, 64, dev, 0, 0); 2739 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev)) 2740 addrconf_add_linklocal(idev, &addr); 2741 return; 2742 } 2743 2744 sit_add_v4_addrs(idev); 2745 2746 if (dev->flags&IFF_POINTOPOINT) 2747 addrconf_add_mroute(dev); 2748 else 2749 sit_route_add(dev); 2750 } 2751 #endif 2752 2753 #if IS_ENABLED(CONFIG_NET_IPGRE) 2754 static void addrconf_gre_config(struct net_device *dev) 2755 { 2756 struct inet6_dev *idev; 2757 struct in6_addr addr; 2758 2759 pr_info("%s(%s)\n", __func__, dev->name); 2760 2761 ASSERT_RTNL(); 2762 2763 if ((idev = ipv6_find_idev(dev)) == NULL) { 2764 pr_debug("%s: add_dev failed\n", __func__); 2765 return; 2766 } 2767 2768 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0); 2769 addrconf_prefix_route(&addr, 64, dev, 0, 0); 2770 2771 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev)) 2772 addrconf_add_linklocal(idev, &addr); 2773 } 2774 #endif 2775 2776 static inline int 2777 ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev) 2778 { 2779 struct in6_addr lladdr; 2780 2781 if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) { 2782 addrconf_add_linklocal(idev, &lladdr); 2783 return 0; 2784 } 2785 return -1; 2786 } 2787 2788 static void ip6_tnl_add_linklocal(struct inet6_dev *idev) 2789 { 2790 struct net_device *link_dev; 2791 struct net *net = dev_net(idev->dev); 2792 2793 /* first try to inherit the link-local address from the link device */ 2794 if (idev->dev->iflink && 2795 (link_dev = __dev_get_by_index(net, idev->dev->iflink))) { 2796 if (!ipv6_inherit_linklocal(idev, link_dev)) 2797 return; 2798 } 2799 /* then try to inherit it from any device */ 2800 for_each_netdev(net, link_dev) { 2801 if (!ipv6_inherit_linklocal(idev, link_dev)) 2802 return; 2803 } 2804 pr_debug("init ip6-ip6: add_linklocal failed\n"); 2805 } 2806 2807 /* 2808 * Autoconfigure tunnel with a link-local address so routing protocols, 2809 * DHCPv6, MLD etc. can be run over the virtual link 2810 */ 2811 2812 static void addrconf_ip6_tnl_config(struct net_device *dev) 2813 { 2814 struct inet6_dev *idev; 2815 2816 ASSERT_RTNL(); 2817 2818 idev = addrconf_add_dev(dev); 2819 if (IS_ERR(idev)) { 2820 pr_debug("init ip6-ip6: add_dev failed\n"); 2821 return; 2822 } 2823 ip6_tnl_add_linklocal(idev); 2824 } 2825 2826 static int addrconf_notify(struct notifier_block *this, unsigned long event, 2827 void *data) 2828 { 2829 struct net_device *dev = (struct net_device *) data; 2830 struct inet6_dev *idev = __in6_dev_get(dev); 2831 int run_pending = 0; 2832 int err; 2833 2834 switch (event) { 2835 case NETDEV_REGISTER: 2836 if (!idev && dev->mtu >= IPV6_MIN_MTU) { 2837 idev = ipv6_add_dev(dev); 2838 if (!idev) 2839 return notifier_from_errno(-ENOMEM); 2840 } 2841 break; 2842 2843 case NETDEV_UP: 2844 case NETDEV_CHANGE: 2845 if (dev->flags & IFF_SLAVE) 2846 break; 2847 2848 if (event == NETDEV_UP) { 2849 if (!addrconf_qdisc_ok(dev)) { 2850 /* device is not ready yet. */ 2851 pr_info("ADDRCONF(NETDEV_UP): %s: link is not ready\n", 2852 dev->name); 2853 break; 2854 } 2855 2856 if (!idev && dev->mtu >= IPV6_MIN_MTU) 2857 idev = ipv6_add_dev(dev); 2858 2859 if (idev) { 2860 idev->if_flags |= IF_READY; 2861 run_pending = 1; 2862 } 2863 } else { 2864 if (!addrconf_qdisc_ok(dev)) { 2865 /* device is still not ready. */ 2866 break; 2867 } 2868 2869 if (idev) { 2870 if (idev->if_flags & IF_READY) 2871 /* device is already configured. */ 2872 break; 2873 idev->if_flags |= IF_READY; 2874 } 2875 2876 pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n", 2877 dev->name); 2878 2879 run_pending = 1; 2880 } 2881 2882 switch (dev->type) { 2883 #if IS_ENABLED(CONFIG_IPV6_SIT) 2884 case ARPHRD_SIT: 2885 addrconf_sit_config(dev); 2886 break; 2887 #endif 2888 #if IS_ENABLED(CONFIG_NET_IPGRE) 2889 case ARPHRD_IPGRE: 2890 addrconf_gre_config(dev); 2891 break; 2892 #endif 2893 case ARPHRD_TUNNEL6: 2894 addrconf_ip6_tnl_config(dev); 2895 break; 2896 case ARPHRD_LOOPBACK: 2897 init_loopback(dev); 2898 break; 2899 2900 default: 2901 addrconf_dev_config(dev); 2902 break; 2903 } 2904 2905 if (idev) { 2906 if (run_pending) 2907 addrconf_dad_run(idev); 2908 2909 /* 2910 * If the MTU changed during the interface down, 2911 * when the interface up, the changed MTU must be 2912 * reflected in the idev as well as routers. 2913 */ 2914 if (idev->cnf.mtu6 != dev->mtu && 2915 dev->mtu >= IPV6_MIN_MTU) { 2916 rt6_mtu_change(dev, dev->mtu); 2917 idev->cnf.mtu6 = dev->mtu; 2918 } 2919 idev->tstamp = jiffies; 2920 inet6_ifinfo_notify(RTM_NEWLINK, idev); 2921 2922 /* 2923 * If the changed mtu during down is lower than 2924 * IPV6_MIN_MTU stop IPv6 on this interface. 2925 */ 2926 if (dev->mtu < IPV6_MIN_MTU) 2927 addrconf_ifdown(dev, 1); 2928 } 2929 break; 2930 2931 case NETDEV_CHANGEMTU: 2932 if (idev && dev->mtu >= IPV6_MIN_MTU) { 2933 rt6_mtu_change(dev, dev->mtu); 2934 idev->cnf.mtu6 = dev->mtu; 2935 break; 2936 } 2937 2938 if (!idev && dev->mtu >= IPV6_MIN_MTU) { 2939 idev = ipv6_add_dev(dev); 2940 if (idev) 2941 break; 2942 } 2943 2944 /* 2945 * MTU falled under IPV6_MIN_MTU. 2946 * Stop IPv6 on this interface. 2947 */ 2948 2949 case NETDEV_DOWN: 2950 case NETDEV_UNREGISTER: 2951 /* 2952 * Remove all addresses from this interface. 2953 */ 2954 addrconf_ifdown(dev, event != NETDEV_DOWN); 2955 break; 2956 2957 case NETDEV_CHANGENAME: 2958 if (idev) { 2959 snmp6_unregister_dev(idev); 2960 addrconf_sysctl_unregister(idev); 2961 addrconf_sysctl_register(idev); 2962 err = snmp6_register_dev(idev); 2963 if (err) 2964 return notifier_from_errno(err); 2965 } 2966 break; 2967 2968 case NETDEV_PRE_TYPE_CHANGE: 2969 case NETDEV_POST_TYPE_CHANGE: 2970 addrconf_type_change(dev, event); 2971 break; 2972 } 2973 2974 return NOTIFY_OK; 2975 } 2976 2977 /* 2978 * addrconf module should be notified of a device going up 2979 */ 2980 static struct notifier_block ipv6_dev_notf = { 2981 .notifier_call = addrconf_notify, 2982 }; 2983 2984 static void addrconf_type_change(struct net_device *dev, unsigned long event) 2985 { 2986 struct inet6_dev *idev; 2987 ASSERT_RTNL(); 2988 2989 idev = __in6_dev_get(dev); 2990 2991 if (event == NETDEV_POST_TYPE_CHANGE) 2992 ipv6_mc_remap(idev); 2993 else if (event == NETDEV_PRE_TYPE_CHANGE) 2994 ipv6_mc_unmap(idev); 2995 } 2996 2997 static int addrconf_ifdown(struct net_device *dev, int how) 2998 { 2999 struct net *net = dev_net(dev); 3000 struct inet6_dev *idev; 3001 struct inet6_ifaddr *ifa; 3002 int state, i; 3003 3004 ASSERT_RTNL(); 3005 3006 rt6_ifdown(net, dev); 3007 neigh_ifdown(&nd_tbl, dev); 3008 3009 idev = __in6_dev_get(dev); 3010 if (idev == NULL) 3011 return -ENODEV; 3012 3013 /* 3014 * Step 1: remove reference to ipv6 device from parent device. 3015 * Do not dev_put! 3016 */ 3017 if (how) { 3018 idev->dead = 1; 3019 3020 /* protected by rtnl_lock */ 3021 RCU_INIT_POINTER(dev->ip6_ptr, NULL); 3022 3023 /* Step 1.5: remove snmp6 entry */ 3024 snmp6_unregister_dev(idev); 3025 3026 } 3027 3028 /* Step 2: clear hash table */ 3029 for (i = 0; i < IN6_ADDR_HSIZE; i++) { 3030 struct hlist_head *h = &inet6_addr_lst[i]; 3031 3032 spin_lock_bh(&addrconf_hash_lock); 3033 restart: 3034 hlist_for_each_entry_rcu(ifa, h, addr_lst) { 3035 if (ifa->idev == idev) { 3036 hlist_del_init_rcu(&ifa->addr_lst); 3037 addrconf_del_timer(ifa); 3038 goto restart; 3039 } 3040 } 3041 spin_unlock_bh(&addrconf_hash_lock); 3042 } 3043 3044 write_lock_bh(&idev->lock); 3045 3046 /* Step 2: clear flags for stateless addrconf */ 3047 if (!how) 3048 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY); 3049 3050 #ifdef CONFIG_IPV6_PRIVACY 3051 if (how && del_timer(&idev->regen_timer)) 3052 in6_dev_put(idev); 3053 3054 /* Step 3: clear tempaddr list */ 3055 while (!list_empty(&idev->tempaddr_list)) { 3056 ifa = list_first_entry(&idev->tempaddr_list, 3057 struct inet6_ifaddr, tmp_list); 3058 list_del(&ifa->tmp_list); 3059 write_unlock_bh(&idev->lock); 3060 spin_lock_bh(&ifa->lock); 3061 3062 if (ifa->ifpub) { 3063 in6_ifa_put(ifa->ifpub); 3064 ifa->ifpub = NULL; 3065 } 3066 spin_unlock_bh(&ifa->lock); 3067 in6_ifa_put(ifa); 3068 write_lock_bh(&idev->lock); 3069 } 3070 #endif 3071 3072 while (!list_empty(&idev->addr_list)) { 3073 ifa = list_first_entry(&idev->addr_list, 3074 struct inet6_ifaddr, if_list); 3075 addrconf_del_timer(ifa); 3076 3077 list_del(&ifa->if_list); 3078 3079 write_unlock_bh(&idev->lock); 3080 3081 spin_lock_bh(&ifa->state_lock); 3082 state = ifa->state; 3083 ifa->state = INET6_IFADDR_STATE_DEAD; 3084 spin_unlock_bh(&ifa->state_lock); 3085 3086 if (state != INET6_IFADDR_STATE_DEAD) { 3087 __ipv6_ifa_notify(RTM_DELADDR, ifa); 3088 inet6addr_notifier_call_chain(NETDEV_DOWN, ifa); 3089 } 3090 in6_ifa_put(ifa); 3091 3092 write_lock_bh(&idev->lock); 3093 } 3094 3095 write_unlock_bh(&idev->lock); 3096 3097 /* Step 5: Discard multicast list */ 3098 if (how) 3099 ipv6_mc_destroy_dev(idev); 3100 else 3101 ipv6_mc_down(idev); 3102 3103 idev->tstamp = jiffies; 3104 3105 /* Last: Shot the device (if unregistered) */ 3106 if (how) { 3107 addrconf_sysctl_unregister(idev); 3108 neigh_parms_release(&nd_tbl, idev->nd_parms); 3109 neigh_ifdown(&nd_tbl, dev); 3110 in6_dev_put(idev); 3111 } 3112 return 0; 3113 } 3114 3115 static void addrconf_rs_timer(unsigned long data) 3116 { 3117 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data; 3118 struct inet6_dev *idev = ifp->idev; 3119 3120 read_lock(&idev->lock); 3121 if (idev->dead || !(idev->if_flags & IF_READY)) 3122 goto out; 3123 3124 if (!ipv6_accept_ra(idev)) 3125 goto out; 3126 3127 /* Announcement received after solicitation was sent */ 3128 if (idev->if_flags & IF_RA_RCVD) 3129 goto out; 3130 3131 spin_lock(&ifp->lock); 3132 if (ifp->probes++ < idev->cnf.rtr_solicits) { 3133 /* The wait after the last probe can be shorter */ 3134 addrconf_mod_timer(ifp, AC_RS, 3135 (ifp->probes == idev->cnf.rtr_solicits) ? 3136 idev->cnf.rtr_solicit_delay : 3137 idev->cnf.rtr_solicit_interval); 3138 spin_unlock(&ifp->lock); 3139 3140 ndisc_send_rs(idev->dev, &ifp->addr, &in6addr_linklocal_allrouters); 3141 } else { 3142 spin_unlock(&ifp->lock); 3143 /* 3144 * Note: we do not support deprecated "all on-link" 3145 * assumption any longer. 3146 */ 3147 pr_debug("%s: no IPv6 routers present\n", idev->dev->name); 3148 } 3149 3150 out: 3151 read_unlock(&idev->lock); 3152 in6_ifa_put(ifp); 3153 } 3154 3155 /* 3156 * Duplicate Address Detection 3157 */ 3158 static void addrconf_dad_kick(struct inet6_ifaddr *ifp) 3159 { 3160 unsigned long rand_num; 3161 struct inet6_dev *idev = ifp->idev; 3162 3163 if (ifp->flags & IFA_F_OPTIMISTIC) 3164 rand_num = 0; 3165 else 3166 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1); 3167 3168 ifp->probes = idev->cnf.dad_transmits; 3169 addrconf_mod_timer(ifp, AC_DAD, rand_num); 3170 } 3171 3172 static void addrconf_dad_start(struct inet6_ifaddr *ifp) 3173 { 3174 struct inet6_dev *idev = ifp->idev; 3175 struct net_device *dev = idev->dev; 3176 3177 addrconf_join_solict(dev, &ifp->addr); 3178 3179 net_srandom(ifp->addr.s6_addr32[3]); 3180 3181 read_lock_bh(&idev->lock); 3182 spin_lock(&ifp->lock); 3183 if (ifp->state == INET6_IFADDR_STATE_DEAD) 3184 goto out; 3185 3186 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) || 3187 idev->cnf.accept_dad < 1 || 3188 !(ifp->flags&IFA_F_TENTATIVE) || 3189 ifp->flags & IFA_F_NODAD) { 3190 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED); 3191 spin_unlock(&ifp->lock); 3192 read_unlock_bh(&idev->lock); 3193 3194 addrconf_dad_completed(ifp); 3195 return; 3196 } 3197 3198 if (!(idev->if_flags & IF_READY)) { 3199 spin_unlock(&ifp->lock); 3200 read_unlock_bh(&idev->lock); 3201 /* 3202 * If the device is not ready: 3203 * - keep it tentative if it is a permanent address. 3204 * - otherwise, kill it. 3205 */ 3206 in6_ifa_hold(ifp); 3207 addrconf_dad_stop(ifp, 0); 3208 return; 3209 } 3210 3211 /* 3212 * Optimistic nodes can start receiving 3213 * Frames right away 3214 */ 3215 if (ifp->flags & IFA_F_OPTIMISTIC) 3216 ip6_ins_rt(ifp->rt); 3217 3218 addrconf_dad_kick(ifp); 3219 out: 3220 spin_unlock(&ifp->lock); 3221 read_unlock_bh(&idev->lock); 3222 } 3223 3224 static void addrconf_dad_timer(unsigned long data) 3225 { 3226 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data; 3227 struct inet6_dev *idev = ifp->idev; 3228 struct in6_addr mcaddr; 3229 3230 if (!ifp->probes && addrconf_dad_end(ifp)) 3231 goto out; 3232 3233 read_lock(&idev->lock); 3234 if (idev->dead || !(idev->if_flags & IF_READY)) { 3235 read_unlock(&idev->lock); 3236 goto out; 3237 } 3238 3239 spin_lock(&ifp->lock); 3240 if (ifp->state == INET6_IFADDR_STATE_DEAD) { 3241 spin_unlock(&ifp->lock); 3242 read_unlock(&idev->lock); 3243 goto out; 3244 } 3245 3246 if (ifp->probes == 0) { 3247 /* 3248 * DAD was successful 3249 */ 3250 3251 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED); 3252 spin_unlock(&ifp->lock); 3253 read_unlock(&idev->lock); 3254 3255 addrconf_dad_completed(ifp); 3256 3257 goto out; 3258 } 3259 3260 ifp->probes--; 3261 addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time); 3262 spin_unlock(&ifp->lock); 3263 read_unlock(&idev->lock); 3264 3265 /* send a neighbour solicitation for our addr */ 3266 addrconf_addr_solict_mult(&ifp->addr, &mcaddr); 3267 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &in6addr_any); 3268 out: 3269 in6_ifa_put(ifp); 3270 } 3271 3272 static void addrconf_dad_completed(struct inet6_ifaddr *ifp) 3273 { 3274 struct net_device *dev = ifp->idev->dev; 3275 3276 /* 3277 * Configure the address for reception. Now it is valid. 3278 */ 3279 3280 ipv6_ifa_notify(RTM_NEWADDR, ifp); 3281 3282 /* If added prefix is link local and we are prepared to process 3283 router advertisements, start sending router solicitations. 3284 */ 3285 3286 if (ipv6_accept_ra(ifp->idev) && 3287 ifp->idev->cnf.rtr_solicits > 0 && 3288 (dev->flags&IFF_LOOPBACK) == 0 && 3289 (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) { 3290 /* 3291 * If a host as already performed a random delay 3292 * [...] as part of DAD [...] there is no need 3293 * to delay again before sending the first RS 3294 */ 3295 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &in6addr_linklocal_allrouters); 3296 3297 spin_lock_bh(&ifp->lock); 3298 ifp->probes = 1; 3299 ifp->idev->if_flags |= IF_RS_SENT; 3300 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval); 3301 spin_unlock_bh(&ifp->lock); 3302 } 3303 } 3304 3305 static void addrconf_dad_run(struct inet6_dev *idev) 3306 { 3307 struct inet6_ifaddr *ifp; 3308 3309 read_lock_bh(&idev->lock); 3310 list_for_each_entry(ifp, &idev->addr_list, if_list) { 3311 spin_lock(&ifp->lock); 3312 if (ifp->flags & IFA_F_TENTATIVE && 3313 ifp->state == INET6_IFADDR_STATE_DAD) 3314 addrconf_dad_kick(ifp); 3315 spin_unlock(&ifp->lock); 3316 } 3317 read_unlock_bh(&idev->lock); 3318 } 3319 3320 #ifdef CONFIG_PROC_FS 3321 struct if6_iter_state { 3322 struct seq_net_private p; 3323 int bucket; 3324 int offset; 3325 }; 3326 3327 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos) 3328 { 3329 struct inet6_ifaddr *ifa = NULL; 3330 struct if6_iter_state *state = seq->private; 3331 struct net *net = seq_file_net(seq); 3332 int p = 0; 3333 3334 /* initial bucket if pos is 0 */ 3335 if (pos == 0) { 3336 state->bucket = 0; 3337 state->offset = 0; 3338 } 3339 3340 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) { 3341 hlist_for_each_entry_rcu_bh(ifa, &inet6_addr_lst[state->bucket], 3342 addr_lst) { 3343 if (!net_eq(dev_net(ifa->idev->dev), net)) 3344 continue; 3345 /* sync with offset */ 3346 if (p < state->offset) { 3347 p++; 3348 continue; 3349 } 3350 state->offset++; 3351 return ifa; 3352 } 3353 3354 /* prepare for next bucket */ 3355 state->offset = 0; 3356 p = 0; 3357 } 3358 return NULL; 3359 } 3360 3361 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, 3362 struct inet6_ifaddr *ifa) 3363 { 3364 struct if6_iter_state *state = seq->private; 3365 struct net *net = seq_file_net(seq); 3366 3367 hlist_for_each_entry_continue_rcu_bh(ifa, addr_lst) { 3368 if (!net_eq(dev_net(ifa->idev->dev), net)) 3369 continue; 3370 state->offset++; 3371 return ifa; 3372 } 3373 3374 while (++state->bucket < IN6_ADDR_HSIZE) { 3375 state->offset = 0; 3376 hlist_for_each_entry_rcu_bh(ifa, 3377 &inet6_addr_lst[state->bucket], addr_lst) { 3378 if (!net_eq(dev_net(ifa->idev->dev), net)) 3379 continue; 3380 state->offset++; 3381 return ifa; 3382 } 3383 } 3384 3385 return NULL; 3386 } 3387 3388 static void *if6_seq_start(struct seq_file *seq, loff_t *pos) 3389 __acquires(rcu_bh) 3390 { 3391 rcu_read_lock_bh(); 3392 return if6_get_first(seq, *pos); 3393 } 3394 3395 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos) 3396 { 3397 struct inet6_ifaddr *ifa; 3398 3399 ifa = if6_get_next(seq, v); 3400 ++*pos; 3401 return ifa; 3402 } 3403 3404 static void if6_seq_stop(struct seq_file *seq, void *v) 3405 __releases(rcu_bh) 3406 { 3407 rcu_read_unlock_bh(); 3408 } 3409 3410 static int if6_seq_show(struct seq_file *seq, void *v) 3411 { 3412 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v; 3413 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n", 3414 &ifp->addr, 3415 ifp->idev->dev->ifindex, 3416 ifp->prefix_len, 3417 ifp->scope, 3418 ifp->flags, 3419 ifp->idev->dev->name); 3420 return 0; 3421 } 3422 3423 static const struct seq_operations if6_seq_ops = { 3424 .start = if6_seq_start, 3425 .next = if6_seq_next, 3426 .show = if6_seq_show, 3427 .stop = if6_seq_stop, 3428 }; 3429 3430 static int if6_seq_open(struct inode *inode, struct file *file) 3431 { 3432 return seq_open_net(inode, file, &if6_seq_ops, 3433 sizeof(struct if6_iter_state)); 3434 } 3435 3436 static const struct file_operations if6_fops = { 3437 .owner = THIS_MODULE, 3438 .open = if6_seq_open, 3439 .read = seq_read, 3440 .llseek = seq_lseek, 3441 .release = seq_release_net, 3442 }; 3443 3444 static int __net_init if6_proc_net_init(struct net *net) 3445 { 3446 if (!proc_create("if_inet6", S_IRUGO, net->proc_net, &if6_fops)) 3447 return -ENOMEM; 3448 return 0; 3449 } 3450 3451 static void __net_exit if6_proc_net_exit(struct net *net) 3452 { 3453 remove_proc_entry("if_inet6", net->proc_net); 3454 } 3455 3456 static struct pernet_operations if6_proc_net_ops = { 3457 .init = if6_proc_net_init, 3458 .exit = if6_proc_net_exit, 3459 }; 3460 3461 int __init if6_proc_init(void) 3462 { 3463 return register_pernet_subsys(&if6_proc_net_ops); 3464 } 3465 3466 void if6_proc_exit(void) 3467 { 3468 unregister_pernet_subsys(&if6_proc_net_ops); 3469 } 3470 #endif /* CONFIG_PROC_FS */ 3471 3472 #if IS_ENABLED(CONFIG_IPV6_MIP6) 3473 /* Check if address is a home address configured on any interface. */ 3474 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr) 3475 { 3476 int ret = 0; 3477 struct inet6_ifaddr *ifp = NULL; 3478 unsigned int hash = inet6_addr_hash(addr); 3479 3480 rcu_read_lock_bh(); 3481 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) { 3482 if (!net_eq(dev_net(ifp->idev->dev), net)) 3483 continue; 3484 if (ipv6_addr_equal(&ifp->addr, addr) && 3485 (ifp->flags & IFA_F_HOMEADDRESS)) { 3486 ret = 1; 3487 break; 3488 } 3489 } 3490 rcu_read_unlock_bh(); 3491 return ret; 3492 } 3493 #endif 3494 3495 /* 3496 * Periodic address status verification 3497 */ 3498 3499 static void addrconf_verify(unsigned long foo) 3500 { 3501 unsigned long now, next, next_sec, next_sched; 3502 struct inet6_ifaddr *ifp; 3503 int i; 3504 3505 rcu_read_lock_bh(); 3506 spin_lock(&addrconf_verify_lock); 3507 now = jiffies; 3508 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY); 3509 3510 del_timer(&addr_chk_timer); 3511 3512 for (i = 0; i < IN6_ADDR_HSIZE; i++) { 3513 restart: 3514 hlist_for_each_entry_rcu_bh(ifp, 3515 &inet6_addr_lst[i], addr_lst) { 3516 unsigned long age; 3517 3518 if (ifp->flags & IFA_F_PERMANENT) 3519 continue; 3520 3521 spin_lock(&ifp->lock); 3522 /* We try to batch several events at once. */ 3523 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ; 3524 3525 if (ifp->valid_lft != INFINITY_LIFE_TIME && 3526 age >= ifp->valid_lft) { 3527 spin_unlock(&ifp->lock); 3528 in6_ifa_hold(ifp); 3529 ipv6_del_addr(ifp); 3530 goto restart; 3531 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) { 3532 spin_unlock(&ifp->lock); 3533 continue; 3534 } else if (age >= ifp->prefered_lft) { 3535 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */ 3536 int deprecate = 0; 3537 3538 if (!(ifp->flags&IFA_F_DEPRECATED)) { 3539 deprecate = 1; 3540 ifp->flags |= IFA_F_DEPRECATED; 3541 } 3542 3543 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next)) 3544 next = ifp->tstamp + ifp->valid_lft * HZ; 3545 3546 spin_unlock(&ifp->lock); 3547 3548 if (deprecate) { 3549 in6_ifa_hold(ifp); 3550 3551 ipv6_ifa_notify(0, ifp); 3552 in6_ifa_put(ifp); 3553 goto restart; 3554 } 3555 #ifdef CONFIG_IPV6_PRIVACY 3556 } else if ((ifp->flags&IFA_F_TEMPORARY) && 3557 !(ifp->flags&IFA_F_TENTATIVE)) { 3558 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry * 3559 ifp->idev->cnf.dad_transmits * 3560 ifp->idev->nd_parms->retrans_time / HZ; 3561 3562 if (age >= ifp->prefered_lft - regen_advance) { 3563 struct inet6_ifaddr *ifpub = ifp->ifpub; 3564 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 3565 next = ifp->tstamp + ifp->prefered_lft * HZ; 3566 if (!ifp->regen_count && ifpub) { 3567 ifp->regen_count++; 3568 in6_ifa_hold(ifp); 3569 in6_ifa_hold(ifpub); 3570 spin_unlock(&ifp->lock); 3571 3572 spin_lock(&ifpub->lock); 3573 ifpub->regen_count = 0; 3574 spin_unlock(&ifpub->lock); 3575 ipv6_create_tempaddr(ifpub, ifp); 3576 in6_ifa_put(ifpub); 3577 in6_ifa_put(ifp); 3578 goto restart; 3579 } 3580 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next)) 3581 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ; 3582 spin_unlock(&ifp->lock); 3583 #endif 3584 } else { 3585 /* ifp->prefered_lft <= ifp->valid_lft */ 3586 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 3587 next = ifp->tstamp + ifp->prefered_lft * HZ; 3588 spin_unlock(&ifp->lock); 3589 } 3590 } 3591 } 3592 3593 next_sec = round_jiffies_up(next); 3594 next_sched = next; 3595 3596 /* If rounded timeout is accurate enough, accept it. */ 3597 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ)) 3598 next_sched = next_sec; 3599 3600 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */ 3601 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX)) 3602 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX; 3603 3604 ADBG((KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n", 3605 now, next, next_sec, next_sched)); 3606 3607 addr_chk_timer.expires = next_sched; 3608 add_timer(&addr_chk_timer); 3609 spin_unlock(&addrconf_verify_lock); 3610 rcu_read_unlock_bh(); 3611 } 3612 3613 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local) 3614 { 3615 struct in6_addr *pfx = NULL; 3616 3617 if (addr) 3618 pfx = nla_data(addr); 3619 3620 if (local) { 3621 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx))) 3622 pfx = NULL; 3623 else 3624 pfx = nla_data(local); 3625 } 3626 3627 return pfx; 3628 } 3629 3630 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = { 3631 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) }, 3632 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) }, 3633 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) }, 3634 }; 3635 3636 static int 3637 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh) 3638 { 3639 struct net *net = sock_net(skb->sk); 3640 struct ifaddrmsg *ifm; 3641 struct nlattr *tb[IFA_MAX+1]; 3642 struct in6_addr *pfx; 3643 int err; 3644 3645 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy); 3646 if (err < 0) 3647 return err; 3648 3649 ifm = nlmsg_data(nlh); 3650 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]); 3651 if (pfx == NULL) 3652 return -EINVAL; 3653 3654 return inet6_addr_del(net, ifm->ifa_index, pfx, ifm->ifa_prefixlen); 3655 } 3656 3657 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags, 3658 u32 prefered_lft, u32 valid_lft) 3659 { 3660 u32 flags; 3661 clock_t expires; 3662 unsigned long timeout; 3663 3664 if (!valid_lft || (prefered_lft > valid_lft)) 3665 return -EINVAL; 3666 3667 timeout = addrconf_timeout_fixup(valid_lft, HZ); 3668 if (addrconf_finite_timeout(timeout)) { 3669 expires = jiffies_to_clock_t(timeout * HZ); 3670 valid_lft = timeout; 3671 flags = RTF_EXPIRES; 3672 } else { 3673 expires = 0; 3674 flags = 0; 3675 ifa_flags |= IFA_F_PERMANENT; 3676 } 3677 3678 timeout = addrconf_timeout_fixup(prefered_lft, HZ); 3679 if (addrconf_finite_timeout(timeout)) { 3680 if (timeout == 0) 3681 ifa_flags |= IFA_F_DEPRECATED; 3682 prefered_lft = timeout; 3683 } 3684 3685 spin_lock_bh(&ifp->lock); 3686 ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags; 3687 ifp->tstamp = jiffies; 3688 ifp->valid_lft = valid_lft; 3689 ifp->prefered_lft = prefered_lft; 3690 3691 spin_unlock_bh(&ifp->lock); 3692 if (!(ifp->flags&IFA_F_TENTATIVE)) 3693 ipv6_ifa_notify(0, ifp); 3694 3695 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev, 3696 expires, flags); 3697 addrconf_verify(0); 3698 3699 return 0; 3700 } 3701 3702 static int 3703 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh) 3704 { 3705 struct net *net = sock_net(skb->sk); 3706 struct ifaddrmsg *ifm; 3707 struct nlattr *tb[IFA_MAX+1]; 3708 struct in6_addr *pfx; 3709 struct inet6_ifaddr *ifa; 3710 struct net_device *dev; 3711 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME; 3712 u8 ifa_flags; 3713 int err; 3714 3715 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy); 3716 if (err < 0) 3717 return err; 3718 3719 ifm = nlmsg_data(nlh); 3720 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]); 3721 if (pfx == NULL) 3722 return -EINVAL; 3723 3724 if (tb[IFA_CACHEINFO]) { 3725 struct ifa_cacheinfo *ci; 3726 3727 ci = nla_data(tb[IFA_CACHEINFO]); 3728 valid_lft = ci->ifa_valid; 3729 preferred_lft = ci->ifa_prefered; 3730 } else { 3731 preferred_lft = INFINITY_LIFE_TIME; 3732 valid_lft = INFINITY_LIFE_TIME; 3733 } 3734 3735 dev = __dev_get_by_index(net, ifm->ifa_index); 3736 if (dev == NULL) 3737 return -ENODEV; 3738 3739 /* We ignore other flags so far. */ 3740 ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS); 3741 3742 ifa = ipv6_get_ifaddr(net, pfx, dev, 1); 3743 if (ifa == NULL) { 3744 /* 3745 * It would be best to check for !NLM_F_CREATE here but 3746 * userspace alreay relies on not having to provide this. 3747 */ 3748 return inet6_addr_add(net, ifm->ifa_index, pfx, 3749 ifm->ifa_prefixlen, ifa_flags, 3750 preferred_lft, valid_lft); 3751 } 3752 3753 if (nlh->nlmsg_flags & NLM_F_EXCL || 3754 !(nlh->nlmsg_flags & NLM_F_REPLACE)) 3755 err = -EEXIST; 3756 else 3757 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft); 3758 3759 in6_ifa_put(ifa); 3760 3761 return err; 3762 } 3763 3764 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags, 3765 u8 scope, int ifindex) 3766 { 3767 struct ifaddrmsg *ifm; 3768 3769 ifm = nlmsg_data(nlh); 3770 ifm->ifa_family = AF_INET6; 3771 ifm->ifa_prefixlen = prefixlen; 3772 ifm->ifa_flags = flags; 3773 ifm->ifa_scope = scope; 3774 ifm->ifa_index = ifindex; 3775 } 3776 3777 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp, 3778 unsigned long tstamp, u32 preferred, u32 valid) 3779 { 3780 struct ifa_cacheinfo ci; 3781 3782 ci.cstamp = cstamp_delta(cstamp); 3783 ci.tstamp = cstamp_delta(tstamp); 3784 ci.ifa_prefered = preferred; 3785 ci.ifa_valid = valid; 3786 3787 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci); 3788 } 3789 3790 static inline int rt_scope(int ifa_scope) 3791 { 3792 if (ifa_scope & IFA_HOST) 3793 return RT_SCOPE_HOST; 3794 else if (ifa_scope & IFA_LINK) 3795 return RT_SCOPE_LINK; 3796 else if (ifa_scope & IFA_SITE) 3797 return RT_SCOPE_SITE; 3798 else 3799 return RT_SCOPE_UNIVERSE; 3800 } 3801 3802 static inline int inet6_ifaddr_msgsize(void) 3803 { 3804 return NLMSG_ALIGN(sizeof(struct ifaddrmsg)) 3805 + nla_total_size(16) /* IFA_ADDRESS */ 3806 + nla_total_size(sizeof(struct ifa_cacheinfo)); 3807 } 3808 3809 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa, 3810 u32 portid, u32 seq, int event, unsigned int flags) 3811 { 3812 struct nlmsghdr *nlh; 3813 u32 preferred, valid; 3814 3815 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags); 3816 if (nlh == NULL) 3817 return -EMSGSIZE; 3818 3819 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope), 3820 ifa->idev->dev->ifindex); 3821 3822 if (!(ifa->flags&IFA_F_PERMANENT)) { 3823 preferred = ifa->prefered_lft; 3824 valid = ifa->valid_lft; 3825 if (preferred != INFINITY_LIFE_TIME) { 3826 long tval = (jiffies - ifa->tstamp)/HZ; 3827 if (preferred > tval) 3828 preferred -= tval; 3829 else 3830 preferred = 0; 3831 if (valid != INFINITY_LIFE_TIME) { 3832 if (valid > tval) 3833 valid -= tval; 3834 else 3835 valid = 0; 3836 } 3837 } 3838 } else { 3839 preferred = INFINITY_LIFE_TIME; 3840 valid = INFINITY_LIFE_TIME; 3841 } 3842 3843 if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0 || 3844 put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) { 3845 nlmsg_cancel(skb, nlh); 3846 return -EMSGSIZE; 3847 } 3848 3849 return nlmsg_end(skb, nlh); 3850 } 3851 3852 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca, 3853 u32 portid, u32 seq, int event, u16 flags) 3854 { 3855 struct nlmsghdr *nlh; 3856 u8 scope = RT_SCOPE_UNIVERSE; 3857 int ifindex = ifmca->idev->dev->ifindex; 3858 3859 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE) 3860 scope = RT_SCOPE_SITE; 3861 3862 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags); 3863 if (nlh == NULL) 3864 return -EMSGSIZE; 3865 3866 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 3867 if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 || 3868 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp, 3869 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 3870 nlmsg_cancel(skb, nlh); 3871 return -EMSGSIZE; 3872 } 3873 3874 return nlmsg_end(skb, nlh); 3875 } 3876 3877 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca, 3878 u32 portid, u32 seq, int event, unsigned int flags) 3879 { 3880 struct nlmsghdr *nlh; 3881 u8 scope = RT_SCOPE_UNIVERSE; 3882 int ifindex = ifaca->aca_idev->dev->ifindex; 3883 3884 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE) 3885 scope = RT_SCOPE_SITE; 3886 3887 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags); 3888 if (nlh == NULL) 3889 return -EMSGSIZE; 3890 3891 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 3892 if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 || 3893 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp, 3894 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 3895 nlmsg_cancel(skb, nlh); 3896 return -EMSGSIZE; 3897 } 3898 3899 return nlmsg_end(skb, nlh); 3900 } 3901 3902 enum addr_type_t { 3903 UNICAST_ADDR, 3904 MULTICAST_ADDR, 3905 ANYCAST_ADDR, 3906 }; 3907 3908 /* called with rcu_read_lock() */ 3909 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb, 3910 struct netlink_callback *cb, enum addr_type_t type, 3911 int s_ip_idx, int *p_ip_idx) 3912 { 3913 struct ifmcaddr6 *ifmca; 3914 struct ifacaddr6 *ifaca; 3915 int err = 1; 3916 int ip_idx = *p_ip_idx; 3917 3918 read_lock_bh(&idev->lock); 3919 switch (type) { 3920 case UNICAST_ADDR: { 3921 struct inet6_ifaddr *ifa; 3922 3923 /* unicast address incl. temp addr */ 3924 list_for_each_entry(ifa, &idev->addr_list, if_list) { 3925 if (++ip_idx < s_ip_idx) 3926 continue; 3927 err = inet6_fill_ifaddr(skb, ifa, 3928 NETLINK_CB(cb->skb).portid, 3929 cb->nlh->nlmsg_seq, 3930 RTM_NEWADDR, 3931 NLM_F_MULTI); 3932 if (err <= 0) 3933 break; 3934 nl_dump_check_consistent(cb, nlmsg_hdr(skb)); 3935 } 3936 break; 3937 } 3938 case MULTICAST_ADDR: 3939 /* multicast address */ 3940 for (ifmca = idev->mc_list; ifmca; 3941 ifmca = ifmca->next, ip_idx++) { 3942 if (ip_idx < s_ip_idx) 3943 continue; 3944 err = inet6_fill_ifmcaddr(skb, ifmca, 3945 NETLINK_CB(cb->skb).portid, 3946 cb->nlh->nlmsg_seq, 3947 RTM_GETMULTICAST, 3948 NLM_F_MULTI); 3949 if (err <= 0) 3950 break; 3951 } 3952 break; 3953 case ANYCAST_ADDR: 3954 /* anycast address */ 3955 for (ifaca = idev->ac_list; ifaca; 3956 ifaca = ifaca->aca_next, ip_idx++) { 3957 if (ip_idx < s_ip_idx) 3958 continue; 3959 err = inet6_fill_ifacaddr(skb, ifaca, 3960 NETLINK_CB(cb->skb).portid, 3961 cb->nlh->nlmsg_seq, 3962 RTM_GETANYCAST, 3963 NLM_F_MULTI); 3964 if (err <= 0) 3965 break; 3966 } 3967 break; 3968 default: 3969 break; 3970 } 3971 read_unlock_bh(&idev->lock); 3972 *p_ip_idx = ip_idx; 3973 return err; 3974 } 3975 3976 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb, 3977 enum addr_type_t type) 3978 { 3979 struct net *net = sock_net(skb->sk); 3980 int h, s_h; 3981 int idx, ip_idx; 3982 int s_idx, s_ip_idx; 3983 struct net_device *dev; 3984 struct inet6_dev *idev; 3985 struct hlist_head *head; 3986 3987 s_h = cb->args[0]; 3988 s_idx = idx = cb->args[1]; 3989 s_ip_idx = ip_idx = cb->args[2]; 3990 3991 rcu_read_lock(); 3992 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ net->dev_base_seq; 3993 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 3994 idx = 0; 3995 head = &net->dev_index_head[h]; 3996 hlist_for_each_entry_rcu(dev, head, index_hlist) { 3997 if (idx < s_idx) 3998 goto cont; 3999 if (h > s_h || idx > s_idx) 4000 s_ip_idx = 0; 4001 ip_idx = 0; 4002 idev = __in6_dev_get(dev); 4003 if (!idev) 4004 goto cont; 4005 4006 if (in6_dump_addrs(idev, skb, cb, type, 4007 s_ip_idx, &ip_idx) <= 0) 4008 goto done; 4009 cont: 4010 idx++; 4011 } 4012 } 4013 done: 4014 rcu_read_unlock(); 4015 cb->args[0] = h; 4016 cb->args[1] = idx; 4017 cb->args[2] = ip_idx; 4018 4019 return skb->len; 4020 } 4021 4022 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb) 4023 { 4024 enum addr_type_t type = UNICAST_ADDR; 4025 4026 return inet6_dump_addr(skb, cb, type); 4027 } 4028 4029 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb) 4030 { 4031 enum addr_type_t type = MULTICAST_ADDR; 4032 4033 return inet6_dump_addr(skb, cb, type); 4034 } 4035 4036 4037 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb) 4038 { 4039 enum addr_type_t type = ANYCAST_ADDR; 4040 4041 return inet6_dump_addr(skb, cb, type); 4042 } 4043 4044 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh) 4045 { 4046 struct net *net = sock_net(in_skb->sk); 4047 struct ifaddrmsg *ifm; 4048 struct nlattr *tb[IFA_MAX+1]; 4049 struct in6_addr *addr = NULL; 4050 struct net_device *dev = NULL; 4051 struct inet6_ifaddr *ifa; 4052 struct sk_buff *skb; 4053 int err; 4054 4055 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy); 4056 if (err < 0) 4057 goto errout; 4058 4059 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]); 4060 if (addr == NULL) { 4061 err = -EINVAL; 4062 goto errout; 4063 } 4064 4065 ifm = nlmsg_data(nlh); 4066 if (ifm->ifa_index) 4067 dev = __dev_get_by_index(net, ifm->ifa_index); 4068 4069 ifa = ipv6_get_ifaddr(net, addr, dev, 1); 4070 if (!ifa) { 4071 err = -EADDRNOTAVAIL; 4072 goto errout; 4073 } 4074 4075 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL); 4076 if (!skb) { 4077 err = -ENOBUFS; 4078 goto errout_ifa; 4079 } 4080 4081 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).portid, 4082 nlh->nlmsg_seq, RTM_NEWADDR, 0); 4083 if (err < 0) { 4084 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 4085 WARN_ON(err == -EMSGSIZE); 4086 kfree_skb(skb); 4087 goto errout_ifa; 4088 } 4089 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid); 4090 errout_ifa: 4091 in6_ifa_put(ifa); 4092 errout: 4093 return err; 4094 } 4095 4096 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa) 4097 { 4098 struct sk_buff *skb; 4099 struct net *net = dev_net(ifa->idev->dev); 4100 int err = -ENOBUFS; 4101 4102 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC); 4103 if (skb == NULL) 4104 goto errout; 4105 4106 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0); 4107 if (err < 0) { 4108 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 4109 WARN_ON(err == -EMSGSIZE); 4110 kfree_skb(skb); 4111 goto errout; 4112 } 4113 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC); 4114 return; 4115 errout: 4116 if (err < 0) 4117 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err); 4118 } 4119 4120 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf, 4121 __s32 *array, int bytes) 4122 { 4123 BUG_ON(bytes < (DEVCONF_MAX * 4)); 4124 4125 memset(array, 0, bytes); 4126 array[DEVCONF_FORWARDING] = cnf->forwarding; 4127 array[DEVCONF_HOPLIMIT] = cnf->hop_limit; 4128 array[DEVCONF_MTU6] = cnf->mtu6; 4129 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra; 4130 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects; 4131 array[DEVCONF_AUTOCONF] = cnf->autoconf; 4132 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits; 4133 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits; 4134 array[DEVCONF_RTR_SOLICIT_INTERVAL] = 4135 jiffies_to_msecs(cnf->rtr_solicit_interval); 4136 array[DEVCONF_RTR_SOLICIT_DELAY] = 4137 jiffies_to_msecs(cnf->rtr_solicit_delay); 4138 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version; 4139 #ifdef CONFIG_IPV6_PRIVACY 4140 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr; 4141 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft; 4142 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft; 4143 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry; 4144 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor; 4145 #endif 4146 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses; 4147 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr; 4148 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo; 4149 #ifdef CONFIG_IPV6_ROUTER_PREF 4150 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref; 4151 array[DEVCONF_RTR_PROBE_INTERVAL] = 4152 jiffies_to_msecs(cnf->rtr_probe_interval); 4153 #ifdef CONFIG_IPV6_ROUTE_INFO 4154 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen; 4155 #endif 4156 #endif 4157 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp; 4158 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route; 4159 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 4160 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad; 4161 #endif 4162 #ifdef CONFIG_IPV6_MROUTE 4163 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding; 4164 #endif 4165 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6; 4166 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad; 4167 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao; 4168 array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify; 4169 } 4170 4171 static inline size_t inet6_ifla6_size(void) 4172 { 4173 return nla_total_size(4) /* IFLA_INET6_FLAGS */ 4174 + nla_total_size(sizeof(struct ifla_cacheinfo)) 4175 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */ 4176 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */ 4177 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */ 4178 + nla_total_size(sizeof(struct in6_addr)); /* IFLA_INET6_TOKEN */ 4179 } 4180 4181 static inline size_t inet6_if_nlmsg_size(void) 4182 { 4183 return NLMSG_ALIGN(sizeof(struct ifinfomsg)) 4184 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */ 4185 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */ 4186 + nla_total_size(4) /* IFLA_MTU */ 4187 + nla_total_size(4) /* IFLA_LINK */ 4188 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */ 4189 } 4190 4191 static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib, 4192 int items, int bytes) 4193 { 4194 int i; 4195 int pad = bytes - sizeof(u64) * items; 4196 BUG_ON(pad < 0); 4197 4198 /* Use put_unaligned() because stats may not be aligned for u64. */ 4199 put_unaligned(items, &stats[0]); 4200 for (i = 1; i < items; i++) 4201 put_unaligned(atomic_long_read(&mib[i]), &stats[i]); 4202 4203 memset(&stats[items], 0, pad); 4204 } 4205 4206 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu **mib, 4207 int items, int bytes, size_t syncpoff) 4208 { 4209 int i; 4210 int pad = bytes - sizeof(u64) * items; 4211 BUG_ON(pad < 0); 4212 4213 /* Use put_unaligned() because stats may not be aligned for u64. */ 4214 put_unaligned(items, &stats[0]); 4215 for (i = 1; i < items; i++) 4216 put_unaligned(snmp_fold_field64(mib, i, syncpoff), &stats[i]); 4217 4218 memset(&stats[items], 0, pad); 4219 } 4220 4221 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype, 4222 int bytes) 4223 { 4224 switch (attrtype) { 4225 case IFLA_INET6_STATS: 4226 __snmp6_fill_stats64(stats, (void __percpu **)idev->stats.ipv6, 4227 IPSTATS_MIB_MAX, bytes, offsetof(struct ipstats_mib, syncp)); 4228 break; 4229 case IFLA_INET6_ICMP6STATS: 4230 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, ICMP6_MIB_MAX, bytes); 4231 break; 4232 } 4233 } 4234 4235 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev) 4236 { 4237 struct nlattr *nla; 4238 struct ifla_cacheinfo ci; 4239 4240 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags)) 4241 goto nla_put_failure; 4242 ci.max_reasm_len = IPV6_MAXPLEN; 4243 ci.tstamp = cstamp_delta(idev->tstamp); 4244 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time); 4245 ci.retrans_time = jiffies_to_msecs(idev->nd_parms->retrans_time); 4246 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci)) 4247 goto nla_put_failure; 4248 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32)); 4249 if (nla == NULL) 4250 goto nla_put_failure; 4251 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla)); 4252 4253 /* XXX - MC not implemented */ 4254 4255 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64)); 4256 if (nla == NULL) 4257 goto nla_put_failure; 4258 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla)); 4259 4260 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64)); 4261 if (nla == NULL) 4262 goto nla_put_failure; 4263 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla)); 4264 4265 nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr)); 4266 if (nla == NULL) 4267 goto nla_put_failure; 4268 read_lock_bh(&idev->lock); 4269 memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla)); 4270 read_unlock_bh(&idev->lock); 4271 4272 return 0; 4273 4274 nla_put_failure: 4275 return -EMSGSIZE; 4276 } 4277 4278 static size_t inet6_get_link_af_size(const struct net_device *dev) 4279 { 4280 if (!__in6_dev_get(dev)) 4281 return 0; 4282 4283 return inet6_ifla6_size(); 4284 } 4285 4286 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev) 4287 { 4288 struct inet6_dev *idev = __in6_dev_get(dev); 4289 4290 if (!idev) 4291 return -ENODATA; 4292 4293 if (inet6_fill_ifla6_attrs(skb, idev) < 0) 4294 return -EMSGSIZE; 4295 4296 return 0; 4297 } 4298 4299 static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token) 4300 { 4301 struct inet6_ifaddr *ifp; 4302 struct net_device *dev = idev->dev; 4303 bool update_rs = false; 4304 4305 if (token == NULL) 4306 return -EINVAL; 4307 if (ipv6_addr_any(token)) 4308 return -EINVAL; 4309 if (dev->flags & (IFF_LOOPBACK | IFF_NOARP)) 4310 return -EINVAL; 4311 if (!ipv6_accept_ra(idev)) 4312 return -EINVAL; 4313 if (idev->cnf.rtr_solicits <= 0) 4314 return -EINVAL; 4315 4316 write_lock_bh(&idev->lock); 4317 4318 BUILD_BUG_ON(sizeof(token->s6_addr) != 16); 4319 memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8); 4320 4321 write_unlock_bh(&idev->lock); 4322 4323 if (!idev->dead && (idev->if_flags & IF_READY)) { 4324 struct in6_addr ll_addr; 4325 4326 ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE | 4327 IFA_F_OPTIMISTIC); 4328 4329 /* If we're not ready, then normal ifup will take care 4330 * of this. Otherwise, we need to request our rs here. 4331 */ 4332 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters); 4333 update_rs = true; 4334 } 4335 4336 write_lock_bh(&idev->lock); 4337 4338 if (update_rs) 4339 idev->if_flags |= IF_RS_SENT; 4340 4341 /* Well, that's kinda nasty ... */ 4342 list_for_each_entry(ifp, &idev->addr_list, if_list) { 4343 spin_lock(&ifp->lock); 4344 if (ifp->tokenized) { 4345 ifp->valid_lft = 0; 4346 ifp->prefered_lft = 0; 4347 } 4348 spin_unlock(&ifp->lock); 4349 } 4350 4351 write_unlock_bh(&idev->lock); 4352 return 0; 4353 } 4354 4355 static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla) 4356 { 4357 int err = -EINVAL; 4358 struct inet6_dev *idev = __in6_dev_get(dev); 4359 struct nlattr *tb[IFLA_INET6_MAX + 1]; 4360 4361 if (!idev) 4362 return -EAFNOSUPPORT; 4363 4364 if (nla_parse_nested(tb, IFLA_INET6_MAX, nla, NULL) < 0) 4365 BUG(); 4366 4367 if (tb[IFLA_INET6_TOKEN]) 4368 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN])); 4369 4370 return err; 4371 } 4372 4373 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev, 4374 u32 portid, u32 seq, int event, unsigned int flags) 4375 { 4376 struct net_device *dev = idev->dev; 4377 struct ifinfomsg *hdr; 4378 struct nlmsghdr *nlh; 4379 void *protoinfo; 4380 4381 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags); 4382 if (nlh == NULL) 4383 return -EMSGSIZE; 4384 4385 hdr = nlmsg_data(nlh); 4386 hdr->ifi_family = AF_INET6; 4387 hdr->__ifi_pad = 0; 4388 hdr->ifi_type = dev->type; 4389 hdr->ifi_index = dev->ifindex; 4390 hdr->ifi_flags = dev_get_flags(dev); 4391 hdr->ifi_change = 0; 4392 4393 if (nla_put_string(skb, IFLA_IFNAME, dev->name) || 4394 (dev->addr_len && 4395 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) || 4396 nla_put_u32(skb, IFLA_MTU, dev->mtu) || 4397 (dev->ifindex != dev->iflink && 4398 nla_put_u32(skb, IFLA_LINK, dev->iflink))) 4399 goto nla_put_failure; 4400 protoinfo = nla_nest_start(skb, IFLA_PROTINFO); 4401 if (protoinfo == NULL) 4402 goto nla_put_failure; 4403 4404 if (inet6_fill_ifla6_attrs(skb, idev) < 0) 4405 goto nla_put_failure; 4406 4407 nla_nest_end(skb, protoinfo); 4408 return nlmsg_end(skb, nlh); 4409 4410 nla_put_failure: 4411 nlmsg_cancel(skb, nlh); 4412 return -EMSGSIZE; 4413 } 4414 4415 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb) 4416 { 4417 struct net *net = sock_net(skb->sk); 4418 int h, s_h; 4419 int idx = 0, s_idx; 4420 struct net_device *dev; 4421 struct inet6_dev *idev; 4422 struct hlist_head *head; 4423 4424 s_h = cb->args[0]; 4425 s_idx = cb->args[1]; 4426 4427 rcu_read_lock(); 4428 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 4429 idx = 0; 4430 head = &net->dev_index_head[h]; 4431 hlist_for_each_entry_rcu(dev, head, index_hlist) { 4432 if (idx < s_idx) 4433 goto cont; 4434 idev = __in6_dev_get(dev); 4435 if (!idev) 4436 goto cont; 4437 if (inet6_fill_ifinfo(skb, idev, 4438 NETLINK_CB(cb->skb).portid, 4439 cb->nlh->nlmsg_seq, 4440 RTM_NEWLINK, NLM_F_MULTI) <= 0) 4441 goto out; 4442 cont: 4443 idx++; 4444 } 4445 } 4446 out: 4447 rcu_read_unlock(); 4448 cb->args[1] = idx; 4449 cb->args[0] = h; 4450 4451 return skb->len; 4452 } 4453 4454 void inet6_ifinfo_notify(int event, struct inet6_dev *idev) 4455 { 4456 struct sk_buff *skb; 4457 struct net *net = dev_net(idev->dev); 4458 int err = -ENOBUFS; 4459 4460 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC); 4461 if (skb == NULL) 4462 goto errout; 4463 4464 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0); 4465 if (err < 0) { 4466 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */ 4467 WARN_ON(err == -EMSGSIZE); 4468 kfree_skb(skb); 4469 goto errout; 4470 } 4471 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC); 4472 return; 4473 errout: 4474 if (err < 0) 4475 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err); 4476 } 4477 4478 static inline size_t inet6_prefix_nlmsg_size(void) 4479 { 4480 return NLMSG_ALIGN(sizeof(struct prefixmsg)) 4481 + nla_total_size(sizeof(struct in6_addr)) 4482 + nla_total_size(sizeof(struct prefix_cacheinfo)); 4483 } 4484 4485 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev, 4486 struct prefix_info *pinfo, u32 portid, u32 seq, 4487 int event, unsigned int flags) 4488 { 4489 struct prefixmsg *pmsg; 4490 struct nlmsghdr *nlh; 4491 struct prefix_cacheinfo ci; 4492 4493 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags); 4494 if (nlh == NULL) 4495 return -EMSGSIZE; 4496 4497 pmsg = nlmsg_data(nlh); 4498 pmsg->prefix_family = AF_INET6; 4499 pmsg->prefix_pad1 = 0; 4500 pmsg->prefix_pad2 = 0; 4501 pmsg->prefix_ifindex = idev->dev->ifindex; 4502 pmsg->prefix_len = pinfo->prefix_len; 4503 pmsg->prefix_type = pinfo->type; 4504 pmsg->prefix_pad3 = 0; 4505 pmsg->prefix_flags = 0; 4506 if (pinfo->onlink) 4507 pmsg->prefix_flags |= IF_PREFIX_ONLINK; 4508 if (pinfo->autoconf) 4509 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF; 4510 4511 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix)) 4512 goto nla_put_failure; 4513 ci.preferred_time = ntohl(pinfo->prefered); 4514 ci.valid_time = ntohl(pinfo->valid); 4515 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci)) 4516 goto nla_put_failure; 4517 return nlmsg_end(skb, nlh); 4518 4519 nla_put_failure: 4520 nlmsg_cancel(skb, nlh); 4521 return -EMSGSIZE; 4522 } 4523 4524 static void inet6_prefix_notify(int event, struct inet6_dev *idev, 4525 struct prefix_info *pinfo) 4526 { 4527 struct sk_buff *skb; 4528 struct net *net = dev_net(idev->dev); 4529 int err = -ENOBUFS; 4530 4531 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC); 4532 if (skb == NULL) 4533 goto errout; 4534 4535 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0); 4536 if (err < 0) { 4537 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */ 4538 WARN_ON(err == -EMSGSIZE); 4539 kfree_skb(skb); 4540 goto errout; 4541 } 4542 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC); 4543 return; 4544 errout: 4545 if (err < 0) 4546 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err); 4547 } 4548 4549 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 4550 { 4551 struct net *net = dev_net(ifp->idev->dev); 4552 4553 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp); 4554 4555 switch (event) { 4556 case RTM_NEWADDR: 4557 /* 4558 * If the address was optimistic 4559 * we inserted the route at the start of 4560 * our DAD process, so we don't need 4561 * to do it again 4562 */ 4563 if (!(ifp->rt->rt6i_node)) 4564 ip6_ins_rt(ifp->rt); 4565 if (ifp->idev->cnf.forwarding) 4566 addrconf_join_anycast(ifp); 4567 break; 4568 case RTM_DELADDR: 4569 if (ifp->idev->cnf.forwarding) 4570 addrconf_leave_anycast(ifp); 4571 addrconf_leave_solict(ifp->idev, &ifp->addr); 4572 dst_hold(&ifp->rt->dst); 4573 4574 if (ip6_del_rt(ifp->rt)) 4575 dst_free(&ifp->rt->dst); 4576 break; 4577 } 4578 atomic_inc(&net->ipv6.dev_addr_genid); 4579 } 4580 4581 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 4582 { 4583 rcu_read_lock_bh(); 4584 if (likely(ifp->idev->dead == 0)) 4585 __ipv6_ifa_notify(event, ifp); 4586 rcu_read_unlock_bh(); 4587 } 4588 4589 #ifdef CONFIG_SYSCTL 4590 4591 static 4592 int addrconf_sysctl_forward(ctl_table *ctl, int write, 4593 void __user *buffer, size_t *lenp, loff_t *ppos) 4594 { 4595 int *valp = ctl->data; 4596 int val = *valp; 4597 loff_t pos = *ppos; 4598 ctl_table lctl; 4599 int ret; 4600 4601 /* 4602 * ctl->data points to idev->cnf.forwarding, we should 4603 * not modify it until we get the rtnl lock. 4604 */ 4605 lctl = *ctl; 4606 lctl.data = &val; 4607 4608 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 4609 4610 if (write) 4611 ret = addrconf_fixup_forwarding(ctl, valp, val); 4612 if (ret) 4613 *ppos = pos; 4614 return ret; 4615 } 4616 4617 static void dev_disable_change(struct inet6_dev *idev) 4618 { 4619 if (!idev || !idev->dev) 4620 return; 4621 4622 if (idev->cnf.disable_ipv6) 4623 addrconf_notify(NULL, NETDEV_DOWN, idev->dev); 4624 else 4625 addrconf_notify(NULL, NETDEV_UP, idev->dev); 4626 } 4627 4628 static void addrconf_disable_change(struct net *net, __s32 newf) 4629 { 4630 struct net_device *dev; 4631 struct inet6_dev *idev; 4632 4633 rcu_read_lock(); 4634 for_each_netdev_rcu(net, dev) { 4635 idev = __in6_dev_get(dev); 4636 if (idev) { 4637 int changed = (!idev->cnf.disable_ipv6) ^ (!newf); 4638 idev->cnf.disable_ipv6 = newf; 4639 if (changed) 4640 dev_disable_change(idev); 4641 } 4642 } 4643 rcu_read_unlock(); 4644 } 4645 4646 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf) 4647 { 4648 struct net *net; 4649 int old; 4650 4651 if (!rtnl_trylock()) 4652 return restart_syscall(); 4653 4654 net = (struct net *)table->extra2; 4655 old = *p; 4656 *p = newf; 4657 4658 if (p == &net->ipv6.devconf_dflt->disable_ipv6) { 4659 rtnl_unlock(); 4660 return 0; 4661 } 4662 4663 if (p == &net->ipv6.devconf_all->disable_ipv6) { 4664 net->ipv6.devconf_dflt->disable_ipv6 = newf; 4665 addrconf_disable_change(net, newf); 4666 } else if ((!newf) ^ (!old)) 4667 dev_disable_change((struct inet6_dev *)table->extra1); 4668 4669 rtnl_unlock(); 4670 return 0; 4671 } 4672 4673 static 4674 int addrconf_sysctl_disable(ctl_table *ctl, int write, 4675 void __user *buffer, size_t *lenp, loff_t *ppos) 4676 { 4677 int *valp = ctl->data; 4678 int val = *valp; 4679 loff_t pos = *ppos; 4680 ctl_table lctl; 4681 int ret; 4682 4683 /* 4684 * ctl->data points to idev->cnf.disable_ipv6, we should 4685 * not modify it until we get the rtnl lock. 4686 */ 4687 lctl = *ctl; 4688 lctl.data = &val; 4689 4690 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 4691 4692 if (write) 4693 ret = addrconf_disable_ipv6(ctl, valp, val); 4694 if (ret) 4695 *ppos = pos; 4696 return ret; 4697 } 4698 4699 static struct addrconf_sysctl_table 4700 { 4701 struct ctl_table_header *sysctl_header; 4702 ctl_table addrconf_vars[DEVCONF_MAX+1]; 4703 } addrconf_sysctl __read_mostly = { 4704 .sysctl_header = NULL, 4705 .addrconf_vars = { 4706 { 4707 .procname = "forwarding", 4708 .data = &ipv6_devconf.forwarding, 4709 .maxlen = sizeof(int), 4710 .mode = 0644, 4711 .proc_handler = addrconf_sysctl_forward, 4712 }, 4713 { 4714 .procname = "hop_limit", 4715 .data = &ipv6_devconf.hop_limit, 4716 .maxlen = sizeof(int), 4717 .mode = 0644, 4718 .proc_handler = proc_dointvec, 4719 }, 4720 { 4721 .procname = "mtu", 4722 .data = &ipv6_devconf.mtu6, 4723 .maxlen = sizeof(int), 4724 .mode = 0644, 4725 .proc_handler = proc_dointvec, 4726 }, 4727 { 4728 .procname = "accept_ra", 4729 .data = &ipv6_devconf.accept_ra, 4730 .maxlen = sizeof(int), 4731 .mode = 0644, 4732 .proc_handler = proc_dointvec, 4733 }, 4734 { 4735 .procname = "accept_redirects", 4736 .data = &ipv6_devconf.accept_redirects, 4737 .maxlen = sizeof(int), 4738 .mode = 0644, 4739 .proc_handler = proc_dointvec, 4740 }, 4741 { 4742 .procname = "autoconf", 4743 .data = &ipv6_devconf.autoconf, 4744 .maxlen = sizeof(int), 4745 .mode = 0644, 4746 .proc_handler = proc_dointvec, 4747 }, 4748 { 4749 .procname = "dad_transmits", 4750 .data = &ipv6_devconf.dad_transmits, 4751 .maxlen = sizeof(int), 4752 .mode = 0644, 4753 .proc_handler = proc_dointvec, 4754 }, 4755 { 4756 .procname = "router_solicitations", 4757 .data = &ipv6_devconf.rtr_solicits, 4758 .maxlen = sizeof(int), 4759 .mode = 0644, 4760 .proc_handler = proc_dointvec, 4761 }, 4762 { 4763 .procname = "router_solicitation_interval", 4764 .data = &ipv6_devconf.rtr_solicit_interval, 4765 .maxlen = sizeof(int), 4766 .mode = 0644, 4767 .proc_handler = proc_dointvec_jiffies, 4768 }, 4769 { 4770 .procname = "router_solicitation_delay", 4771 .data = &ipv6_devconf.rtr_solicit_delay, 4772 .maxlen = sizeof(int), 4773 .mode = 0644, 4774 .proc_handler = proc_dointvec_jiffies, 4775 }, 4776 { 4777 .procname = "force_mld_version", 4778 .data = &ipv6_devconf.force_mld_version, 4779 .maxlen = sizeof(int), 4780 .mode = 0644, 4781 .proc_handler = proc_dointvec, 4782 }, 4783 #ifdef CONFIG_IPV6_PRIVACY 4784 { 4785 .procname = "use_tempaddr", 4786 .data = &ipv6_devconf.use_tempaddr, 4787 .maxlen = sizeof(int), 4788 .mode = 0644, 4789 .proc_handler = proc_dointvec, 4790 }, 4791 { 4792 .procname = "temp_valid_lft", 4793 .data = &ipv6_devconf.temp_valid_lft, 4794 .maxlen = sizeof(int), 4795 .mode = 0644, 4796 .proc_handler = proc_dointvec, 4797 }, 4798 { 4799 .procname = "temp_prefered_lft", 4800 .data = &ipv6_devconf.temp_prefered_lft, 4801 .maxlen = sizeof(int), 4802 .mode = 0644, 4803 .proc_handler = proc_dointvec, 4804 }, 4805 { 4806 .procname = "regen_max_retry", 4807 .data = &ipv6_devconf.regen_max_retry, 4808 .maxlen = sizeof(int), 4809 .mode = 0644, 4810 .proc_handler = proc_dointvec, 4811 }, 4812 { 4813 .procname = "max_desync_factor", 4814 .data = &ipv6_devconf.max_desync_factor, 4815 .maxlen = sizeof(int), 4816 .mode = 0644, 4817 .proc_handler = proc_dointvec, 4818 }, 4819 #endif 4820 { 4821 .procname = "max_addresses", 4822 .data = &ipv6_devconf.max_addresses, 4823 .maxlen = sizeof(int), 4824 .mode = 0644, 4825 .proc_handler = proc_dointvec, 4826 }, 4827 { 4828 .procname = "accept_ra_defrtr", 4829 .data = &ipv6_devconf.accept_ra_defrtr, 4830 .maxlen = sizeof(int), 4831 .mode = 0644, 4832 .proc_handler = proc_dointvec, 4833 }, 4834 { 4835 .procname = "accept_ra_pinfo", 4836 .data = &ipv6_devconf.accept_ra_pinfo, 4837 .maxlen = sizeof(int), 4838 .mode = 0644, 4839 .proc_handler = proc_dointvec, 4840 }, 4841 #ifdef CONFIG_IPV6_ROUTER_PREF 4842 { 4843 .procname = "accept_ra_rtr_pref", 4844 .data = &ipv6_devconf.accept_ra_rtr_pref, 4845 .maxlen = sizeof(int), 4846 .mode = 0644, 4847 .proc_handler = proc_dointvec, 4848 }, 4849 { 4850 .procname = "router_probe_interval", 4851 .data = &ipv6_devconf.rtr_probe_interval, 4852 .maxlen = sizeof(int), 4853 .mode = 0644, 4854 .proc_handler = proc_dointvec_jiffies, 4855 }, 4856 #ifdef CONFIG_IPV6_ROUTE_INFO 4857 { 4858 .procname = "accept_ra_rt_info_max_plen", 4859 .data = &ipv6_devconf.accept_ra_rt_info_max_plen, 4860 .maxlen = sizeof(int), 4861 .mode = 0644, 4862 .proc_handler = proc_dointvec, 4863 }, 4864 #endif 4865 #endif 4866 { 4867 .procname = "proxy_ndp", 4868 .data = &ipv6_devconf.proxy_ndp, 4869 .maxlen = sizeof(int), 4870 .mode = 0644, 4871 .proc_handler = proc_dointvec, 4872 }, 4873 { 4874 .procname = "accept_source_route", 4875 .data = &ipv6_devconf.accept_source_route, 4876 .maxlen = sizeof(int), 4877 .mode = 0644, 4878 .proc_handler = proc_dointvec, 4879 }, 4880 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 4881 { 4882 .procname = "optimistic_dad", 4883 .data = &ipv6_devconf.optimistic_dad, 4884 .maxlen = sizeof(int), 4885 .mode = 0644, 4886 .proc_handler = proc_dointvec, 4887 4888 }, 4889 #endif 4890 #ifdef CONFIG_IPV6_MROUTE 4891 { 4892 .procname = "mc_forwarding", 4893 .data = &ipv6_devconf.mc_forwarding, 4894 .maxlen = sizeof(int), 4895 .mode = 0444, 4896 .proc_handler = proc_dointvec, 4897 }, 4898 #endif 4899 { 4900 .procname = "disable_ipv6", 4901 .data = &ipv6_devconf.disable_ipv6, 4902 .maxlen = sizeof(int), 4903 .mode = 0644, 4904 .proc_handler = addrconf_sysctl_disable, 4905 }, 4906 { 4907 .procname = "accept_dad", 4908 .data = &ipv6_devconf.accept_dad, 4909 .maxlen = sizeof(int), 4910 .mode = 0644, 4911 .proc_handler = proc_dointvec, 4912 }, 4913 { 4914 .procname = "force_tllao", 4915 .data = &ipv6_devconf.force_tllao, 4916 .maxlen = sizeof(int), 4917 .mode = 0644, 4918 .proc_handler = proc_dointvec 4919 }, 4920 { 4921 .procname = "ndisc_notify", 4922 .data = &ipv6_devconf.ndisc_notify, 4923 .maxlen = sizeof(int), 4924 .mode = 0644, 4925 .proc_handler = proc_dointvec 4926 }, 4927 { 4928 /* sentinel */ 4929 } 4930 }, 4931 }; 4932 4933 static int __addrconf_sysctl_register(struct net *net, char *dev_name, 4934 struct inet6_dev *idev, struct ipv6_devconf *p) 4935 { 4936 int i; 4937 struct addrconf_sysctl_table *t; 4938 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ]; 4939 4940 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL); 4941 if (t == NULL) 4942 goto out; 4943 4944 for (i = 0; t->addrconf_vars[i].data; i++) { 4945 t->addrconf_vars[i].data += (char *)p - (char *)&ipv6_devconf; 4946 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */ 4947 t->addrconf_vars[i].extra2 = net; 4948 } 4949 4950 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name); 4951 4952 t->sysctl_header = register_net_sysctl(net, path, t->addrconf_vars); 4953 if (t->sysctl_header == NULL) 4954 goto free; 4955 4956 p->sysctl = t; 4957 return 0; 4958 4959 free: 4960 kfree(t); 4961 out: 4962 return -ENOBUFS; 4963 } 4964 4965 static void __addrconf_sysctl_unregister(struct ipv6_devconf *p) 4966 { 4967 struct addrconf_sysctl_table *t; 4968 4969 if (p->sysctl == NULL) 4970 return; 4971 4972 t = p->sysctl; 4973 p->sysctl = NULL; 4974 unregister_net_sysctl_table(t->sysctl_header); 4975 kfree(t); 4976 } 4977 4978 static void addrconf_sysctl_register(struct inet6_dev *idev) 4979 { 4980 neigh_sysctl_register(idev->dev, idev->nd_parms, "ipv6", 4981 &ndisc_ifinfo_sysctl_change); 4982 __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name, 4983 idev, &idev->cnf); 4984 } 4985 4986 static void addrconf_sysctl_unregister(struct inet6_dev *idev) 4987 { 4988 __addrconf_sysctl_unregister(&idev->cnf); 4989 neigh_sysctl_unregister(idev->nd_parms); 4990 } 4991 4992 4993 #endif 4994 4995 static int __net_init addrconf_init_net(struct net *net) 4996 { 4997 int err = -ENOMEM; 4998 struct ipv6_devconf *all, *dflt; 4999 5000 all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL); 5001 if (all == NULL) 5002 goto err_alloc_all; 5003 5004 dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL); 5005 if (dflt == NULL) 5006 goto err_alloc_dflt; 5007 5008 /* these will be inherited by all namespaces */ 5009 dflt->autoconf = ipv6_defaults.autoconf; 5010 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6; 5011 5012 net->ipv6.devconf_all = all; 5013 net->ipv6.devconf_dflt = dflt; 5014 5015 #ifdef CONFIG_SYSCTL 5016 err = __addrconf_sysctl_register(net, "all", NULL, all); 5017 if (err < 0) 5018 goto err_reg_all; 5019 5020 err = __addrconf_sysctl_register(net, "default", NULL, dflt); 5021 if (err < 0) 5022 goto err_reg_dflt; 5023 #endif 5024 return 0; 5025 5026 #ifdef CONFIG_SYSCTL 5027 err_reg_dflt: 5028 __addrconf_sysctl_unregister(all); 5029 err_reg_all: 5030 kfree(dflt); 5031 #endif 5032 err_alloc_dflt: 5033 kfree(all); 5034 err_alloc_all: 5035 return err; 5036 } 5037 5038 static void __net_exit addrconf_exit_net(struct net *net) 5039 { 5040 #ifdef CONFIG_SYSCTL 5041 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt); 5042 __addrconf_sysctl_unregister(net->ipv6.devconf_all); 5043 #endif 5044 if (!net_eq(net, &init_net)) { 5045 kfree(net->ipv6.devconf_dflt); 5046 kfree(net->ipv6.devconf_all); 5047 } 5048 } 5049 5050 static struct pernet_operations addrconf_ops = { 5051 .init = addrconf_init_net, 5052 .exit = addrconf_exit_net, 5053 }; 5054 5055 static struct rtnl_af_ops inet6_ops = { 5056 .family = AF_INET6, 5057 .fill_link_af = inet6_fill_link_af, 5058 .get_link_af_size = inet6_get_link_af_size, 5059 .set_link_af = inet6_set_link_af, 5060 }; 5061 5062 /* 5063 * Init / cleanup code 5064 */ 5065 5066 int __init addrconf_init(void) 5067 { 5068 int i, err; 5069 5070 err = ipv6_addr_label_init(); 5071 if (err < 0) { 5072 pr_crit("%s: cannot initialize default policy table: %d\n", 5073 __func__, err); 5074 goto out; 5075 } 5076 5077 err = register_pernet_subsys(&addrconf_ops); 5078 if (err < 0) 5079 goto out_addrlabel; 5080 5081 /* The addrconf netdev notifier requires that loopback_dev 5082 * has it's ipv6 private information allocated and setup 5083 * before it can bring up and give link-local addresses 5084 * to other devices which are up. 5085 * 5086 * Unfortunately, loopback_dev is not necessarily the first 5087 * entry in the global dev_base list of net devices. In fact, 5088 * it is likely to be the very last entry on that list. 5089 * So this causes the notifier registry below to try and 5090 * give link-local addresses to all devices besides loopback_dev 5091 * first, then loopback_dev, which cases all the non-loopback_dev 5092 * devices to fail to get a link-local address. 5093 * 5094 * So, as a temporary fix, allocate the ipv6 structure for 5095 * loopback_dev first by hand. 5096 * Longer term, all of the dependencies ipv6 has upon the loopback 5097 * device and it being up should be removed. 5098 */ 5099 rtnl_lock(); 5100 if (!ipv6_add_dev(init_net.loopback_dev)) 5101 err = -ENOMEM; 5102 rtnl_unlock(); 5103 if (err) 5104 goto errlo; 5105 5106 for (i = 0; i < IN6_ADDR_HSIZE; i++) 5107 INIT_HLIST_HEAD(&inet6_addr_lst[i]); 5108 5109 register_netdevice_notifier(&ipv6_dev_notf); 5110 5111 addrconf_verify(0); 5112 5113 err = rtnl_af_register(&inet6_ops); 5114 if (err < 0) 5115 goto errout_af; 5116 5117 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo, 5118 NULL); 5119 if (err < 0) 5120 goto errout; 5121 5122 /* Only the first call to __rtnl_register can fail */ 5123 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL, NULL); 5124 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL, NULL); 5125 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr, 5126 inet6_dump_ifaddr, NULL); 5127 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL, 5128 inet6_dump_ifmcaddr, NULL); 5129 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL, 5130 inet6_dump_ifacaddr, NULL); 5131 __rtnl_register(PF_INET6, RTM_GETNETCONF, inet6_netconf_get_devconf, 5132 inet6_netconf_dump_devconf, NULL); 5133 5134 ipv6_addr_label_rtnl_register(); 5135 5136 return 0; 5137 errout: 5138 rtnl_af_unregister(&inet6_ops); 5139 errout_af: 5140 unregister_netdevice_notifier(&ipv6_dev_notf); 5141 errlo: 5142 unregister_pernet_subsys(&addrconf_ops); 5143 out_addrlabel: 5144 ipv6_addr_label_cleanup(); 5145 out: 5146 return err; 5147 } 5148 5149 void addrconf_cleanup(void) 5150 { 5151 struct net_device *dev; 5152 int i; 5153 5154 unregister_netdevice_notifier(&ipv6_dev_notf); 5155 unregister_pernet_subsys(&addrconf_ops); 5156 ipv6_addr_label_cleanup(); 5157 5158 rtnl_lock(); 5159 5160 __rtnl_af_unregister(&inet6_ops); 5161 5162 /* clean dev list */ 5163 for_each_netdev(&init_net, dev) { 5164 if (__in6_dev_get(dev) == NULL) 5165 continue; 5166 addrconf_ifdown(dev, 1); 5167 } 5168 addrconf_ifdown(init_net.loopback_dev, 2); 5169 5170 /* 5171 * Check hash table. 5172 */ 5173 spin_lock_bh(&addrconf_hash_lock); 5174 for (i = 0; i < IN6_ADDR_HSIZE; i++) 5175 WARN_ON(!hlist_empty(&inet6_addr_lst[i])); 5176 spin_unlock_bh(&addrconf_hash_lock); 5177 5178 del_timer(&addr_chk_timer); 5179 rtnl_unlock(); 5180 } 5181