1 /* 2 * IPv6 Address [auto]configuration 3 * Linux INET6 implementation 4 * 5 * Authors: 6 * Pedro Roque <roque@di.fc.ul.pt> 7 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru> 8 * 9 * This program is free software; you can redistribute it and/or 10 * modify it under the terms of the GNU General Public License 11 * as published by the Free Software Foundation; either version 12 * 2 of the License, or (at your option) any later version. 13 */ 14 15 /* 16 * Changes: 17 * 18 * Janos Farkas : delete timer on ifdown 19 * <chexum@bankinf.banki.hu> 20 * Andi Kleen : kill double kfree on module 21 * unload. 22 * Maciej W. Rozycki : FDDI support 23 * sekiya@USAGI : Don't send too many RS 24 * packets. 25 * yoshfuji@USAGI : Fixed interval between DAD 26 * packets. 27 * YOSHIFUJI Hideaki @USAGI : improved accuracy of 28 * address validation timer. 29 * YOSHIFUJI Hideaki @USAGI : Privacy Extensions (RFC3041) 30 * support. 31 * Yuji SEKIYA @USAGI : Don't assign a same IPv6 32 * address on a same interface. 33 * YOSHIFUJI Hideaki @USAGI : ARCnet support 34 * YOSHIFUJI Hideaki @USAGI : convert /proc/net/if_inet6 to 35 * seq_file. 36 * YOSHIFUJI Hideaki @USAGI : improved source address 37 * selection; consider scope, 38 * status etc. 39 */ 40 41 #define pr_fmt(fmt) "IPv6: " fmt 42 43 #include <linux/errno.h> 44 #include <linux/types.h> 45 #include <linux/kernel.h> 46 #include <linux/socket.h> 47 #include <linux/sockios.h> 48 #include <linux/net.h> 49 #include <linux/in6.h> 50 #include <linux/netdevice.h> 51 #include <linux/if_addr.h> 52 #include <linux/if_arp.h> 53 #include <linux/if_arcnet.h> 54 #include <linux/if_infiniband.h> 55 #include <linux/route.h> 56 #include <linux/inetdevice.h> 57 #include <linux/init.h> 58 #include <linux/slab.h> 59 #ifdef CONFIG_SYSCTL 60 #include <linux/sysctl.h> 61 #endif 62 #include <linux/capability.h> 63 #include <linux/delay.h> 64 #include <linux/notifier.h> 65 #include <linux/string.h> 66 #include <linux/hash.h> 67 68 #include <net/net_namespace.h> 69 #include <net/sock.h> 70 #include <net/snmp.h> 71 72 #include <net/af_ieee802154.h> 73 #include <net/firewire.h> 74 #include <net/ipv6.h> 75 #include <net/protocol.h> 76 #include <net/ndisc.h> 77 #include <net/ip6_route.h> 78 #include <net/addrconf.h> 79 #include <net/tcp.h> 80 #include <net/ip.h> 81 #include <net/netlink.h> 82 #include <net/pkt_sched.h> 83 #include <linux/if_tunnel.h> 84 #include <linux/rtnetlink.h> 85 #include <linux/netconf.h> 86 #include <linux/random.h> 87 #include <linux/uaccess.h> 88 #include <asm/unaligned.h> 89 90 #include <linux/proc_fs.h> 91 #include <linux/seq_file.h> 92 #include <linux/export.h> 93 94 /* Set to 3 to get tracing... */ 95 #define ACONF_DEBUG 2 96 97 #if ACONF_DEBUG >= 3 98 #define ADBG(fmt, ...) printk(fmt, ##__VA_ARGS__) 99 #else 100 #define ADBG(fmt, ...) do { if (0) printk(fmt, ##__VA_ARGS__); } while (0) 101 #endif 102 103 #define INFINITY_LIFE_TIME 0xFFFFFFFF 104 105 static inline u32 cstamp_delta(unsigned long cstamp) 106 { 107 return (cstamp - INITIAL_JIFFIES) * 100UL / HZ; 108 } 109 110 #ifdef CONFIG_SYSCTL 111 static void addrconf_sysctl_register(struct inet6_dev *idev); 112 static void addrconf_sysctl_unregister(struct inet6_dev *idev); 113 #else 114 static inline void addrconf_sysctl_register(struct inet6_dev *idev) 115 { 116 } 117 118 static inline void addrconf_sysctl_unregister(struct inet6_dev *idev) 119 { 120 } 121 #endif 122 123 static void __ipv6_regen_rndid(struct inet6_dev *idev); 124 static void __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr); 125 static void ipv6_regen_rndid(unsigned long data); 126 127 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev); 128 static int ipv6_count_addresses(struct inet6_dev *idev); 129 130 /* 131 * Configured unicast address hash table 132 */ 133 static struct hlist_head inet6_addr_lst[IN6_ADDR_HSIZE]; 134 static DEFINE_SPINLOCK(addrconf_hash_lock); 135 136 static void addrconf_verify(unsigned long); 137 138 static DEFINE_TIMER(addr_chk_timer, addrconf_verify, 0, 0); 139 static DEFINE_SPINLOCK(addrconf_verify_lock); 140 141 static void addrconf_join_anycast(struct inet6_ifaddr *ifp); 142 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp); 143 144 static void addrconf_type_change(struct net_device *dev, 145 unsigned long event); 146 static int addrconf_ifdown(struct net_device *dev, int how); 147 148 static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx, 149 int plen, 150 const struct net_device *dev, 151 u32 flags, u32 noflags); 152 153 static void addrconf_dad_start(struct inet6_ifaddr *ifp); 154 static void addrconf_dad_timer(unsigned long data); 155 static void addrconf_dad_completed(struct inet6_ifaddr *ifp); 156 static void addrconf_dad_run(struct inet6_dev *idev); 157 static void addrconf_rs_timer(unsigned long data); 158 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa); 159 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa); 160 161 static void inet6_prefix_notify(int event, struct inet6_dev *idev, 162 struct prefix_info *pinfo); 163 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr, 164 struct net_device *dev); 165 166 static struct ipv6_devconf ipv6_devconf __read_mostly = { 167 .forwarding = 0, 168 .hop_limit = IPV6_DEFAULT_HOPLIMIT, 169 .mtu6 = IPV6_MIN_MTU, 170 .accept_ra = 1, 171 .accept_redirects = 1, 172 .autoconf = 1, 173 .force_mld_version = 0, 174 .mldv1_unsolicited_report_interval = 10 * HZ, 175 .mldv2_unsolicited_report_interval = HZ, 176 .dad_transmits = 1, 177 .rtr_solicits = MAX_RTR_SOLICITATIONS, 178 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL, 179 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY, 180 .use_tempaddr = 0, 181 .temp_valid_lft = TEMP_VALID_LIFETIME, 182 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME, 183 .regen_max_retry = REGEN_MAX_RETRY, 184 .max_desync_factor = MAX_DESYNC_FACTOR, 185 .max_addresses = IPV6_MAX_ADDRESSES, 186 .accept_ra_defrtr = 1, 187 .accept_ra_pinfo = 1, 188 #ifdef CONFIG_IPV6_ROUTER_PREF 189 .accept_ra_rtr_pref = 1, 190 .rtr_probe_interval = 60 * HZ, 191 #ifdef CONFIG_IPV6_ROUTE_INFO 192 .accept_ra_rt_info_max_plen = 0, 193 #endif 194 #endif 195 .proxy_ndp = 0, 196 .accept_source_route = 0, /* we do not accept RH0 by default. */ 197 .disable_ipv6 = 0, 198 .accept_dad = 1, 199 .suppress_frag_ndisc = 1, 200 }; 201 202 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = { 203 .forwarding = 0, 204 .hop_limit = IPV6_DEFAULT_HOPLIMIT, 205 .mtu6 = IPV6_MIN_MTU, 206 .accept_ra = 1, 207 .accept_redirects = 1, 208 .autoconf = 1, 209 .force_mld_version = 0, 210 .mldv1_unsolicited_report_interval = 10 * HZ, 211 .mldv2_unsolicited_report_interval = HZ, 212 .dad_transmits = 1, 213 .rtr_solicits = MAX_RTR_SOLICITATIONS, 214 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL, 215 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY, 216 .use_tempaddr = 0, 217 .temp_valid_lft = TEMP_VALID_LIFETIME, 218 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME, 219 .regen_max_retry = REGEN_MAX_RETRY, 220 .max_desync_factor = MAX_DESYNC_FACTOR, 221 .max_addresses = IPV6_MAX_ADDRESSES, 222 .accept_ra_defrtr = 1, 223 .accept_ra_pinfo = 1, 224 #ifdef CONFIG_IPV6_ROUTER_PREF 225 .accept_ra_rtr_pref = 1, 226 .rtr_probe_interval = 60 * HZ, 227 #ifdef CONFIG_IPV6_ROUTE_INFO 228 .accept_ra_rt_info_max_plen = 0, 229 #endif 230 #endif 231 .proxy_ndp = 0, 232 .accept_source_route = 0, /* we do not accept RH0 by default. */ 233 .disable_ipv6 = 0, 234 .accept_dad = 1, 235 .suppress_frag_ndisc = 1, 236 }; 237 238 /* Check if a valid qdisc is available */ 239 static inline bool addrconf_qdisc_ok(const struct net_device *dev) 240 { 241 return !qdisc_tx_is_noop(dev); 242 } 243 244 static void addrconf_del_rs_timer(struct inet6_dev *idev) 245 { 246 if (del_timer(&idev->rs_timer)) 247 __in6_dev_put(idev); 248 } 249 250 static void addrconf_del_dad_timer(struct inet6_ifaddr *ifp) 251 { 252 if (del_timer(&ifp->dad_timer)) 253 __in6_ifa_put(ifp); 254 } 255 256 static void addrconf_mod_rs_timer(struct inet6_dev *idev, 257 unsigned long when) 258 { 259 if (!timer_pending(&idev->rs_timer)) 260 in6_dev_hold(idev); 261 mod_timer(&idev->rs_timer, jiffies + when); 262 } 263 264 static void addrconf_mod_dad_timer(struct inet6_ifaddr *ifp, 265 unsigned long when) 266 { 267 if (!timer_pending(&ifp->dad_timer)) 268 in6_ifa_hold(ifp); 269 mod_timer(&ifp->dad_timer, jiffies + when); 270 } 271 272 static int snmp6_alloc_dev(struct inet6_dev *idev) 273 { 274 int i; 275 276 if (snmp_mib_init((void __percpu **)idev->stats.ipv6, 277 sizeof(struct ipstats_mib), 278 __alignof__(struct ipstats_mib)) < 0) 279 goto err_ip; 280 281 for_each_possible_cpu(i) { 282 struct ipstats_mib *addrconf_stats; 283 addrconf_stats = per_cpu_ptr(idev->stats.ipv6[0], i); 284 u64_stats_init(&addrconf_stats->syncp); 285 #if SNMP_ARRAY_SZ == 2 286 addrconf_stats = per_cpu_ptr(idev->stats.ipv6[1], i); 287 u64_stats_init(&addrconf_stats->syncp); 288 #endif 289 } 290 291 292 idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device), 293 GFP_KERNEL); 294 if (!idev->stats.icmpv6dev) 295 goto err_icmp; 296 idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device), 297 GFP_KERNEL); 298 if (!idev->stats.icmpv6msgdev) 299 goto err_icmpmsg; 300 301 return 0; 302 303 err_icmpmsg: 304 kfree(idev->stats.icmpv6dev); 305 err_icmp: 306 snmp_mib_free((void __percpu **)idev->stats.ipv6); 307 err_ip: 308 return -ENOMEM; 309 } 310 311 static struct inet6_dev *ipv6_add_dev(struct net_device *dev) 312 { 313 struct inet6_dev *ndev; 314 315 ASSERT_RTNL(); 316 317 if (dev->mtu < IPV6_MIN_MTU) 318 return NULL; 319 320 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL); 321 322 if (ndev == NULL) 323 return NULL; 324 325 rwlock_init(&ndev->lock); 326 ndev->dev = dev; 327 INIT_LIST_HEAD(&ndev->addr_list); 328 setup_timer(&ndev->rs_timer, addrconf_rs_timer, 329 (unsigned long)ndev); 330 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf)); 331 ndev->cnf.mtu6 = dev->mtu; 332 ndev->cnf.sysctl = NULL; 333 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl); 334 if (ndev->nd_parms == NULL) { 335 kfree(ndev); 336 return NULL; 337 } 338 if (ndev->cnf.forwarding) 339 dev_disable_lro(dev); 340 /* We refer to the device */ 341 dev_hold(dev); 342 343 if (snmp6_alloc_dev(ndev) < 0) { 344 ADBG(KERN_WARNING 345 "%s: cannot allocate memory for statistics; dev=%s.\n", 346 __func__, dev->name); 347 neigh_parms_release(&nd_tbl, ndev->nd_parms); 348 dev_put(dev); 349 kfree(ndev); 350 return NULL; 351 } 352 353 if (snmp6_register_dev(ndev) < 0) { 354 ADBG(KERN_WARNING 355 "%s: cannot create /proc/net/dev_snmp6/%s\n", 356 __func__, dev->name); 357 neigh_parms_release(&nd_tbl, ndev->nd_parms); 358 ndev->dead = 1; 359 in6_dev_finish_destroy(ndev); 360 return NULL; 361 } 362 363 /* One reference from device. We must do this before 364 * we invoke __ipv6_regen_rndid(). 365 */ 366 in6_dev_hold(ndev); 367 368 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK)) 369 ndev->cnf.accept_dad = -1; 370 371 #if IS_ENABLED(CONFIG_IPV6_SIT) 372 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) { 373 pr_info("%s: Disabled Multicast RS\n", dev->name); 374 ndev->cnf.rtr_solicits = 0; 375 } 376 #endif 377 378 INIT_LIST_HEAD(&ndev->tempaddr_list); 379 setup_timer(&ndev->regen_timer, ipv6_regen_rndid, (unsigned long)ndev); 380 if ((dev->flags&IFF_LOOPBACK) || 381 dev->type == ARPHRD_TUNNEL || 382 dev->type == ARPHRD_TUNNEL6 || 383 dev->type == ARPHRD_SIT || 384 dev->type == ARPHRD_NONE) { 385 ndev->cnf.use_tempaddr = -1; 386 } else { 387 in6_dev_hold(ndev); 388 ipv6_regen_rndid((unsigned long) ndev); 389 } 390 391 ndev->token = in6addr_any; 392 393 if (netif_running(dev) && addrconf_qdisc_ok(dev)) 394 ndev->if_flags |= IF_READY; 395 396 ipv6_mc_init_dev(ndev); 397 ndev->tstamp = jiffies; 398 addrconf_sysctl_register(ndev); 399 /* protected by rtnl_lock */ 400 rcu_assign_pointer(dev->ip6_ptr, ndev); 401 402 /* Join interface-local all-node multicast group */ 403 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allnodes); 404 405 /* Join all-node multicast group */ 406 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes); 407 408 /* Join all-router multicast group if forwarding is set */ 409 if (ndev->cnf.forwarding && (dev->flags & IFF_MULTICAST)) 410 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters); 411 412 return ndev; 413 } 414 415 static struct inet6_dev *ipv6_find_idev(struct net_device *dev) 416 { 417 struct inet6_dev *idev; 418 419 ASSERT_RTNL(); 420 421 idev = __in6_dev_get(dev); 422 if (!idev) { 423 idev = ipv6_add_dev(dev); 424 if (!idev) 425 return NULL; 426 } 427 428 if (dev->flags&IFF_UP) 429 ipv6_mc_up(idev); 430 return idev; 431 } 432 433 static int inet6_netconf_msgsize_devconf(int type) 434 { 435 int size = NLMSG_ALIGN(sizeof(struct netconfmsg)) 436 + nla_total_size(4); /* NETCONFA_IFINDEX */ 437 438 /* type -1 is used for ALL */ 439 if (type == -1 || type == NETCONFA_FORWARDING) 440 size += nla_total_size(4); 441 #ifdef CONFIG_IPV6_MROUTE 442 if (type == -1 || type == NETCONFA_MC_FORWARDING) 443 size += nla_total_size(4); 444 #endif 445 if (type == -1 || type == NETCONFA_PROXY_NEIGH) 446 size += nla_total_size(4); 447 448 return size; 449 } 450 451 static int inet6_netconf_fill_devconf(struct sk_buff *skb, int ifindex, 452 struct ipv6_devconf *devconf, u32 portid, 453 u32 seq, int event, unsigned int flags, 454 int type) 455 { 456 struct nlmsghdr *nlh; 457 struct netconfmsg *ncm; 458 459 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg), 460 flags); 461 if (nlh == NULL) 462 return -EMSGSIZE; 463 464 ncm = nlmsg_data(nlh); 465 ncm->ncm_family = AF_INET6; 466 467 if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0) 468 goto nla_put_failure; 469 470 /* type -1 is used for ALL */ 471 if ((type == -1 || type == NETCONFA_FORWARDING) && 472 nla_put_s32(skb, NETCONFA_FORWARDING, devconf->forwarding) < 0) 473 goto nla_put_failure; 474 #ifdef CONFIG_IPV6_MROUTE 475 if ((type == -1 || type == NETCONFA_MC_FORWARDING) && 476 nla_put_s32(skb, NETCONFA_MC_FORWARDING, 477 devconf->mc_forwarding) < 0) 478 goto nla_put_failure; 479 #endif 480 if ((type == -1 || type == NETCONFA_PROXY_NEIGH) && 481 nla_put_s32(skb, NETCONFA_PROXY_NEIGH, devconf->proxy_ndp) < 0) 482 goto nla_put_failure; 483 484 return nlmsg_end(skb, nlh); 485 486 nla_put_failure: 487 nlmsg_cancel(skb, nlh); 488 return -EMSGSIZE; 489 } 490 491 void inet6_netconf_notify_devconf(struct net *net, int type, int ifindex, 492 struct ipv6_devconf *devconf) 493 { 494 struct sk_buff *skb; 495 int err = -ENOBUFS; 496 497 skb = nlmsg_new(inet6_netconf_msgsize_devconf(type), GFP_ATOMIC); 498 if (skb == NULL) 499 goto errout; 500 501 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 0, 0, 502 RTM_NEWNETCONF, 0, type); 503 if (err < 0) { 504 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */ 505 WARN_ON(err == -EMSGSIZE); 506 kfree_skb(skb); 507 goto errout; 508 } 509 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_NETCONF, NULL, GFP_ATOMIC); 510 return; 511 errout: 512 rtnl_set_sk_err(net, RTNLGRP_IPV6_NETCONF, err); 513 } 514 515 static const struct nla_policy devconf_ipv6_policy[NETCONFA_MAX+1] = { 516 [NETCONFA_IFINDEX] = { .len = sizeof(int) }, 517 [NETCONFA_FORWARDING] = { .len = sizeof(int) }, 518 [NETCONFA_PROXY_NEIGH] = { .len = sizeof(int) }, 519 }; 520 521 static int inet6_netconf_get_devconf(struct sk_buff *in_skb, 522 struct nlmsghdr *nlh) 523 { 524 struct net *net = sock_net(in_skb->sk); 525 struct nlattr *tb[NETCONFA_MAX+1]; 526 struct netconfmsg *ncm; 527 struct sk_buff *skb; 528 struct ipv6_devconf *devconf; 529 struct inet6_dev *in6_dev; 530 struct net_device *dev; 531 int ifindex; 532 int err; 533 534 err = nlmsg_parse(nlh, sizeof(*ncm), tb, NETCONFA_MAX, 535 devconf_ipv6_policy); 536 if (err < 0) 537 goto errout; 538 539 err = EINVAL; 540 if (!tb[NETCONFA_IFINDEX]) 541 goto errout; 542 543 ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]); 544 switch (ifindex) { 545 case NETCONFA_IFINDEX_ALL: 546 devconf = net->ipv6.devconf_all; 547 break; 548 case NETCONFA_IFINDEX_DEFAULT: 549 devconf = net->ipv6.devconf_dflt; 550 break; 551 default: 552 dev = __dev_get_by_index(net, ifindex); 553 if (dev == NULL) 554 goto errout; 555 in6_dev = __in6_dev_get(dev); 556 if (in6_dev == NULL) 557 goto errout; 558 devconf = &in6_dev->cnf; 559 break; 560 } 561 562 err = -ENOBUFS; 563 skb = nlmsg_new(inet6_netconf_msgsize_devconf(-1), GFP_ATOMIC); 564 if (skb == NULL) 565 goto errout; 566 567 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 568 NETLINK_CB(in_skb).portid, 569 nlh->nlmsg_seq, RTM_NEWNETCONF, 0, 570 -1); 571 if (err < 0) { 572 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */ 573 WARN_ON(err == -EMSGSIZE); 574 kfree_skb(skb); 575 goto errout; 576 } 577 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid); 578 errout: 579 return err; 580 } 581 582 static int inet6_netconf_dump_devconf(struct sk_buff *skb, 583 struct netlink_callback *cb) 584 { 585 struct net *net = sock_net(skb->sk); 586 int h, s_h; 587 int idx, s_idx; 588 struct net_device *dev; 589 struct inet6_dev *idev; 590 struct hlist_head *head; 591 592 s_h = cb->args[0]; 593 s_idx = idx = cb->args[1]; 594 595 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 596 idx = 0; 597 head = &net->dev_index_head[h]; 598 rcu_read_lock(); 599 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ 600 net->dev_base_seq; 601 hlist_for_each_entry_rcu(dev, head, index_hlist) { 602 if (idx < s_idx) 603 goto cont; 604 idev = __in6_dev_get(dev); 605 if (!idev) 606 goto cont; 607 608 if (inet6_netconf_fill_devconf(skb, dev->ifindex, 609 &idev->cnf, 610 NETLINK_CB(cb->skb).portid, 611 cb->nlh->nlmsg_seq, 612 RTM_NEWNETCONF, 613 NLM_F_MULTI, 614 -1) <= 0) { 615 rcu_read_unlock(); 616 goto done; 617 } 618 nl_dump_check_consistent(cb, nlmsg_hdr(skb)); 619 cont: 620 idx++; 621 } 622 rcu_read_unlock(); 623 } 624 if (h == NETDEV_HASHENTRIES) { 625 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL, 626 net->ipv6.devconf_all, 627 NETLINK_CB(cb->skb).portid, 628 cb->nlh->nlmsg_seq, 629 RTM_NEWNETCONF, NLM_F_MULTI, 630 -1) <= 0) 631 goto done; 632 else 633 h++; 634 } 635 if (h == NETDEV_HASHENTRIES + 1) { 636 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT, 637 net->ipv6.devconf_dflt, 638 NETLINK_CB(cb->skb).portid, 639 cb->nlh->nlmsg_seq, 640 RTM_NEWNETCONF, NLM_F_MULTI, 641 -1) <= 0) 642 goto done; 643 else 644 h++; 645 } 646 done: 647 cb->args[0] = h; 648 cb->args[1] = idx; 649 650 return skb->len; 651 } 652 653 #ifdef CONFIG_SYSCTL 654 static void dev_forward_change(struct inet6_dev *idev) 655 { 656 struct net_device *dev; 657 struct inet6_ifaddr *ifa; 658 659 if (!idev) 660 return; 661 dev = idev->dev; 662 if (idev->cnf.forwarding) 663 dev_disable_lro(dev); 664 if (dev->flags & IFF_MULTICAST) { 665 if (idev->cnf.forwarding) { 666 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters); 667 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allrouters); 668 ipv6_dev_mc_inc(dev, &in6addr_sitelocal_allrouters); 669 } else { 670 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters); 671 ipv6_dev_mc_dec(dev, &in6addr_interfacelocal_allrouters); 672 ipv6_dev_mc_dec(dev, &in6addr_sitelocal_allrouters); 673 } 674 } 675 676 list_for_each_entry(ifa, &idev->addr_list, if_list) { 677 if (ifa->flags&IFA_F_TENTATIVE) 678 continue; 679 if (idev->cnf.forwarding) 680 addrconf_join_anycast(ifa); 681 else 682 addrconf_leave_anycast(ifa); 683 } 684 inet6_netconf_notify_devconf(dev_net(dev), NETCONFA_FORWARDING, 685 dev->ifindex, &idev->cnf); 686 } 687 688 689 static void addrconf_forward_change(struct net *net, __s32 newf) 690 { 691 struct net_device *dev; 692 struct inet6_dev *idev; 693 694 for_each_netdev(net, dev) { 695 idev = __in6_dev_get(dev); 696 if (idev) { 697 int changed = (!idev->cnf.forwarding) ^ (!newf); 698 idev->cnf.forwarding = newf; 699 if (changed) 700 dev_forward_change(idev); 701 } 702 } 703 } 704 705 static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf) 706 { 707 struct net *net; 708 int old; 709 710 if (!rtnl_trylock()) 711 return restart_syscall(); 712 713 net = (struct net *)table->extra2; 714 old = *p; 715 *p = newf; 716 717 if (p == &net->ipv6.devconf_dflt->forwarding) { 718 if ((!newf) ^ (!old)) 719 inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING, 720 NETCONFA_IFINDEX_DEFAULT, 721 net->ipv6.devconf_dflt); 722 rtnl_unlock(); 723 return 0; 724 } 725 726 if (p == &net->ipv6.devconf_all->forwarding) { 727 net->ipv6.devconf_dflt->forwarding = newf; 728 addrconf_forward_change(net, newf); 729 if ((!newf) ^ (!old)) 730 inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING, 731 NETCONFA_IFINDEX_ALL, 732 net->ipv6.devconf_all); 733 } else if ((!newf) ^ (!old)) 734 dev_forward_change((struct inet6_dev *)table->extra1); 735 rtnl_unlock(); 736 737 if (newf) 738 rt6_purge_dflt_routers(net); 739 return 1; 740 } 741 #endif 742 743 /* Nobody refers to this ifaddr, destroy it */ 744 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp) 745 { 746 WARN_ON(!hlist_unhashed(&ifp->addr_lst)); 747 748 #ifdef NET_REFCNT_DEBUG 749 pr_debug("%s\n", __func__); 750 #endif 751 752 in6_dev_put(ifp->idev); 753 754 if (del_timer(&ifp->dad_timer)) 755 pr_notice("Timer is still running, when freeing ifa=%p\n", ifp); 756 757 if (ifp->state != INET6_IFADDR_STATE_DEAD) { 758 pr_warn("Freeing alive inet6 address %p\n", ifp); 759 return; 760 } 761 ip6_rt_put(ifp->rt); 762 763 kfree_rcu(ifp, rcu); 764 } 765 766 static void 767 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp) 768 { 769 struct list_head *p; 770 int ifp_scope = ipv6_addr_src_scope(&ifp->addr); 771 772 /* 773 * Each device address list is sorted in order of scope - 774 * global before linklocal. 775 */ 776 list_for_each(p, &idev->addr_list) { 777 struct inet6_ifaddr *ifa 778 = list_entry(p, struct inet6_ifaddr, if_list); 779 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr)) 780 break; 781 } 782 783 list_add_tail(&ifp->if_list, p); 784 } 785 786 static u32 inet6_addr_hash(const struct in6_addr *addr) 787 { 788 return hash_32(ipv6_addr_hash(addr), IN6_ADDR_HSIZE_SHIFT); 789 } 790 791 /* On success it returns ifp with increased reference count */ 792 793 static struct inet6_ifaddr * 794 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, 795 const struct in6_addr *peer_addr, int pfxlen, 796 int scope, u32 flags, u32 valid_lft, u32 prefered_lft) 797 { 798 struct inet6_ifaddr *ifa = NULL; 799 struct rt6_info *rt; 800 unsigned int hash; 801 int err = 0; 802 int addr_type = ipv6_addr_type(addr); 803 804 if (addr_type == IPV6_ADDR_ANY || 805 addr_type & IPV6_ADDR_MULTICAST || 806 (!(idev->dev->flags & IFF_LOOPBACK) && 807 addr_type & IPV6_ADDR_LOOPBACK)) 808 return ERR_PTR(-EADDRNOTAVAIL); 809 810 rcu_read_lock_bh(); 811 if (idev->dead) { 812 err = -ENODEV; /*XXX*/ 813 goto out2; 814 } 815 816 if (idev->cnf.disable_ipv6) { 817 err = -EACCES; 818 goto out2; 819 } 820 821 spin_lock(&addrconf_hash_lock); 822 823 /* Ignore adding duplicate addresses on an interface */ 824 if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) { 825 ADBG("ipv6_add_addr: already assigned\n"); 826 err = -EEXIST; 827 goto out; 828 } 829 830 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC); 831 832 if (ifa == NULL) { 833 ADBG("ipv6_add_addr: malloc failed\n"); 834 err = -ENOBUFS; 835 goto out; 836 } 837 838 rt = addrconf_dst_alloc(idev, addr, false); 839 if (IS_ERR(rt)) { 840 err = PTR_ERR(rt); 841 goto out; 842 } 843 844 neigh_parms_data_state_setall(idev->nd_parms); 845 846 ifa->addr = *addr; 847 if (peer_addr) 848 ifa->peer_addr = *peer_addr; 849 850 spin_lock_init(&ifa->lock); 851 spin_lock_init(&ifa->state_lock); 852 setup_timer(&ifa->dad_timer, addrconf_dad_timer, 853 (unsigned long)ifa); 854 INIT_HLIST_NODE(&ifa->addr_lst); 855 ifa->scope = scope; 856 ifa->prefix_len = pfxlen; 857 ifa->flags = flags | IFA_F_TENTATIVE; 858 ifa->valid_lft = valid_lft; 859 ifa->prefered_lft = prefered_lft; 860 ifa->cstamp = ifa->tstamp = jiffies; 861 ifa->tokenized = false; 862 863 ifa->rt = rt; 864 865 ifa->idev = idev; 866 in6_dev_hold(idev); 867 /* For caller */ 868 in6_ifa_hold(ifa); 869 870 /* Add to big hash table */ 871 hash = inet6_addr_hash(addr); 872 873 hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]); 874 spin_unlock(&addrconf_hash_lock); 875 876 write_lock(&idev->lock); 877 /* Add to inet6_dev unicast addr list. */ 878 ipv6_link_dev_addr(idev, ifa); 879 880 if (ifa->flags&IFA_F_TEMPORARY) { 881 list_add(&ifa->tmp_list, &idev->tempaddr_list); 882 in6_ifa_hold(ifa); 883 } 884 885 in6_ifa_hold(ifa); 886 write_unlock(&idev->lock); 887 out2: 888 rcu_read_unlock_bh(); 889 890 if (likely(err == 0)) 891 inet6addr_notifier_call_chain(NETDEV_UP, ifa); 892 else { 893 kfree(ifa); 894 ifa = ERR_PTR(err); 895 } 896 897 return ifa; 898 out: 899 spin_unlock(&addrconf_hash_lock); 900 goto out2; 901 } 902 903 enum cleanup_prefix_rt_t { 904 CLEANUP_PREFIX_RT_NOP, /* no cleanup action for prefix route */ 905 CLEANUP_PREFIX_RT_DEL, /* delete the prefix route */ 906 CLEANUP_PREFIX_RT_EXPIRE, /* update the lifetime of the prefix route */ 907 }; 908 909 /* 910 * Check, whether the prefix for ifp would still need a prefix route 911 * after deleting ifp. The function returns one of the CLEANUP_PREFIX_RT_* 912 * constants. 913 * 914 * 1) we don't purge prefix if address was not permanent. 915 * prefix is managed by its own lifetime. 916 * 2) we also don't purge, if the address was IFA_F_NOPREFIXROUTE. 917 * 3) if there are no addresses, delete prefix. 918 * 4) if there are still other permanent address(es), 919 * corresponding prefix is still permanent. 920 * 5) if there are still other addresses with IFA_F_NOPREFIXROUTE, 921 * don't purge the prefix, assume user space is managing it. 922 * 6) otherwise, update prefix lifetime to the 923 * longest valid lifetime among the corresponding 924 * addresses on the device. 925 * Note: subsequent RA will update lifetime. 926 **/ 927 static enum cleanup_prefix_rt_t 928 check_cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long *expires) 929 { 930 struct inet6_ifaddr *ifa; 931 struct inet6_dev *idev = ifp->idev; 932 unsigned long lifetime; 933 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_DEL; 934 935 *expires = jiffies; 936 937 list_for_each_entry(ifa, &idev->addr_list, if_list) { 938 if (ifa == ifp) 939 continue; 940 if (!ipv6_prefix_equal(&ifa->addr, &ifp->addr, 941 ifp->prefix_len)) 942 continue; 943 if (ifa->flags & (IFA_F_PERMANENT | IFA_F_NOPREFIXROUTE)) 944 return CLEANUP_PREFIX_RT_NOP; 945 946 action = CLEANUP_PREFIX_RT_EXPIRE; 947 948 spin_lock(&ifa->lock); 949 950 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ); 951 /* 952 * Note: Because this address is 953 * not permanent, lifetime < 954 * LONG_MAX / HZ here. 955 */ 956 if (time_before(*expires, ifa->tstamp + lifetime * HZ)) 957 *expires = ifa->tstamp + lifetime * HZ; 958 spin_unlock(&ifa->lock); 959 } 960 961 return action; 962 } 963 964 static void 965 cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long expires, bool del_rt) 966 { 967 struct rt6_info *rt; 968 969 rt = addrconf_get_prefix_route(&ifp->addr, 970 ifp->prefix_len, 971 ifp->idev->dev, 972 0, RTF_GATEWAY | RTF_DEFAULT); 973 if (rt) { 974 if (del_rt) 975 ip6_del_rt(rt); 976 else { 977 if (!(rt->rt6i_flags & RTF_EXPIRES)) 978 rt6_set_expires(rt, expires); 979 ip6_rt_put(rt); 980 } 981 } 982 } 983 984 985 /* This function wants to get referenced ifp and releases it before return */ 986 987 static void ipv6_del_addr(struct inet6_ifaddr *ifp) 988 { 989 int state; 990 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_NOP; 991 unsigned long expires; 992 993 spin_lock_bh(&ifp->state_lock); 994 state = ifp->state; 995 ifp->state = INET6_IFADDR_STATE_DEAD; 996 spin_unlock_bh(&ifp->state_lock); 997 998 if (state == INET6_IFADDR_STATE_DEAD) 999 goto out; 1000 1001 spin_lock_bh(&addrconf_hash_lock); 1002 hlist_del_init_rcu(&ifp->addr_lst); 1003 spin_unlock_bh(&addrconf_hash_lock); 1004 1005 write_lock_bh(&ifp->idev->lock); 1006 1007 if (ifp->flags&IFA_F_TEMPORARY) { 1008 list_del(&ifp->tmp_list); 1009 if (ifp->ifpub) { 1010 in6_ifa_put(ifp->ifpub); 1011 ifp->ifpub = NULL; 1012 } 1013 __in6_ifa_put(ifp); 1014 } 1015 1016 if (ifp->flags & IFA_F_PERMANENT && !(ifp->flags & IFA_F_NOPREFIXROUTE)) 1017 action = check_cleanup_prefix_route(ifp, &expires); 1018 1019 list_del_init(&ifp->if_list); 1020 __in6_ifa_put(ifp); 1021 1022 write_unlock_bh(&ifp->idev->lock); 1023 1024 addrconf_del_dad_timer(ifp); 1025 1026 ipv6_ifa_notify(RTM_DELADDR, ifp); 1027 1028 inet6addr_notifier_call_chain(NETDEV_DOWN, ifp); 1029 1030 if (action != CLEANUP_PREFIX_RT_NOP) { 1031 cleanup_prefix_route(ifp, expires, 1032 action == CLEANUP_PREFIX_RT_DEL); 1033 } 1034 1035 /* clean up prefsrc entries */ 1036 rt6_remove_prefsrc(ifp); 1037 out: 1038 in6_ifa_put(ifp); 1039 } 1040 1041 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift) 1042 { 1043 struct inet6_dev *idev = ifp->idev; 1044 struct in6_addr addr, *tmpaddr; 1045 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_tstamp, age; 1046 unsigned long regen_advance; 1047 int tmp_plen; 1048 int ret = 0; 1049 u32 addr_flags; 1050 unsigned long now = jiffies; 1051 1052 write_lock_bh(&idev->lock); 1053 if (ift) { 1054 spin_lock_bh(&ift->lock); 1055 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8); 1056 spin_unlock_bh(&ift->lock); 1057 tmpaddr = &addr; 1058 } else { 1059 tmpaddr = NULL; 1060 } 1061 retry: 1062 in6_dev_hold(idev); 1063 if (idev->cnf.use_tempaddr <= 0) { 1064 write_unlock_bh(&idev->lock); 1065 pr_info("%s: use_tempaddr is disabled\n", __func__); 1066 in6_dev_put(idev); 1067 ret = -1; 1068 goto out; 1069 } 1070 spin_lock_bh(&ifp->lock); 1071 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) { 1072 idev->cnf.use_tempaddr = -1; /*XXX*/ 1073 spin_unlock_bh(&ifp->lock); 1074 write_unlock_bh(&idev->lock); 1075 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n", 1076 __func__); 1077 in6_dev_put(idev); 1078 ret = -1; 1079 goto out; 1080 } 1081 in6_ifa_hold(ifp); 1082 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8); 1083 __ipv6_try_regen_rndid(idev, tmpaddr); 1084 memcpy(&addr.s6_addr[8], idev->rndid, 8); 1085 age = (now - ifp->tstamp) / HZ; 1086 tmp_valid_lft = min_t(__u32, 1087 ifp->valid_lft, 1088 idev->cnf.temp_valid_lft + age); 1089 tmp_prefered_lft = min_t(__u32, 1090 ifp->prefered_lft, 1091 idev->cnf.temp_prefered_lft + age - 1092 idev->cnf.max_desync_factor); 1093 tmp_plen = ifp->prefix_len; 1094 tmp_tstamp = ifp->tstamp; 1095 spin_unlock_bh(&ifp->lock); 1096 1097 regen_advance = idev->cnf.regen_max_retry * 1098 idev->cnf.dad_transmits * 1099 NEIGH_VAR(idev->nd_parms, RETRANS_TIME) / HZ; 1100 write_unlock_bh(&idev->lock); 1101 1102 /* A temporary address is created only if this calculated Preferred 1103 * Lifetime is greater than REGEN_ADVANCE time units. In particular, 1104 * an implementation must not create a temporary address with a zero 1105 * Preferred Lifetime. 1106 * Use age calculation as in addrconf_verify to avoid unnecessary 1107 * temporary addresses being generated. 1108 */ 1109 age = (now - tmp_tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ; 1110 if (tmp_prefered_lft <= regen_advance + age) { 1111 in6_ifa_put(ifp); 1112 in6_dev_put(idev); 1113 ret = -1; 1114 goto out; 1115 } 1116 1117 addr_flags = IFA_F_TEMPORARY; 1118 /* set in addrconf_prefix_rcv() */ 1119 if (ifp->flags & IFA_F_OPTIMISTIC) 1120 addr_flags |= IFA_F_OPTIMISTIC; 1121 1122 ift = ipv6_add_addr(idev, &addr, NULL, tmp_plen, 1123 ipv6_addr_scope(&addr), addr_flags, 1124 tmp_valid_lft, tmp_prefered_lft); 1125 if (IS_ERR(ift)) { 1126 in6_ifa_put(ifp); 1127 in6_dev_put(idev); 1128 pr_info("%s: retry temporary address regeneration\n", __func__); 1129 tmpaddr = &addr; 1130 write_lock_bh(&idev->lock); 1131 goto retry; 1132 } 1133 1134 spin_lock_bh(&ift->lock); 1135 ift->ifpub = ifp; 1136 ift->cstamp = now; 1137 ift->tstamp = tmp_tstamp; 1138 spin_unlock_bh(&ift->lock); 1139 1140 addrconf_dad_start(ift); 1141 in6_ifa_put(ift); 1142 in6_dev_put(idev); 1143 out: 1144 return ret; 1145 } 1146 1147 /* 1148 * Choose an appropriate source address (RFC3484) 1149 */ 1150 enum { 1151 IPV6_SADDR_RULE_INIT = 0, 1152 IPV6_SADDR_RULE_LOCAL, 1153 IPV6_SADDR_RULE_SCOPE, 1154 IPV6_SADDR_RULE_PREFERRED, 1155 #ifdef CONFIG_IPV6_MIP6 1156 IPV6_SADDR_RULE_HOA, 1157 #endif 1158 IPV6_SADDR_RULE_OIF, 1159 IPV6_SADDR_RULE_LABEL, 1160 IPV6_SADDR_RULE_PRIVACY, 1161 IPV6_SADDR_RULE_ORCHID, 1162 IPV6_SADDR_RULE_PREFIX, 1163 IPV6_SADDR_RULE_MAX 1164 }; 1165 1166 struct ipv6_saddr_score { 1167 int rule; 1168 int addr_type; 1169 struct inet6_ifaddr *ifa; 1170 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX); 1171 int scopedist; 1172 int matchlen; 1173 }; 1174 1175 struct ipv6_saddr_dst { 1176 const struct in6_addr *addr; 1177 int ifindex; 1178 int scope; 1179 int label; 1180 unsigned int prefs; 1181 }; 1182 1183 static inline int ipv6_saddr_preferred(int type) 1184 { 1185 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK)) 1186 return 1; 1187 return 0; 1188 } 1189 1190 static int ipv6_get_saddr_eval(struct net *net, 1191 struct ipv6_saddr_score *score, 1192 struct ipv6_saddr_dst *dst, 1193 int i) 1194 { 1195 int ret; 1196 1197 if (i <= score->rule) { 1198 switch (i) { 1199 case IPV6_SADDR_RULE_SCOPE: 1200 ret = score->scopedist; 1201 break; 1202 case IPV6_SADDR_RULE_PREFIX: 1203 ret = score->matchlen; 1204 break; 1205 default: 1206 ret = !!test_bit(i, score->scorebits); 1207 } 1208 goto out; 1209 } 1210 1211 switch (i) { 1212 case IPV6_SADDR_RULE_INIT: 1213 /* Rule 0: remember if hiscore is not ready yet */ 1214 ret = !!score->ifa; 1215 break; 1216 case IPV6_SADDR_RULE_LOCAL: 1217 /* Rule 1: Prefer same address */ 1218 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr); 1219 break; 1220 case IPV6_SADDR_RULE_SCOPE: 1221 /* Rule 2: Prefer appropriate scope 1222 * 1223 * ret 1224 * ^ 1225 * -1 | d 15 1226 * ---+--+-+---> scope 1227 * | 1228 * | d is scope of the destination. 1229 * B-d | \ 1230 * | \ <- smaller scope is better if 1231 * B-15 | \ if scope is enough for destination. 1232 * | ret = B - scope (-1 <= scope >= d <= 15). 1233 * d-C-1 | / 1234 * |/ <- greater is better 1235 * -C / if scope is not enough for destination. 1236 * /| ret = scope - C (-1 <= d < scope <= 15). 1237 * 1238 * d - C - 1 < B -15 (for all -1 <= d <= 15). 1239 * C > d + 14 - B >= 15 + 14 - B = 29 - B. 1240 * Assume B = 0 and we get C > 29. 1241 */ 1242 ret = __ipv6_addr_src_scope(score->addr_type); 1243 if (ret >= dst->scope) 1244 ret = -ret; 1245 else 1246 ret -= 128; /* 30 is enough */ 1247 score->scopedist = ret; 1248 break; 1249 case IPV6_SADDR_RULE_PREFERRED: 1250 /* Rule 3: Avoid deprecated and optimistic addresses */ 1251 ret = ipv6_saddr_preferred(score->addr_type) || 1252 !(score->ifa->flags & (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC)); 1253 break; 1254 #ifdef CONFIG_IPV6_MIP6 1255 case IPV6_SADDR_RULE_HOA: 1256 { 1257 /* Rule 4: Prefer home address */ 1258 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA); 1259 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome; 1260 break; 1261 } 1262 #endif 1263 case IPV6_SADDR_RULE_OIF: 1264 /* Rule 5: Prefer outgoing interface */ 1265 ret = (!dst->ifindex || 1266 dst->ifindex == score->ifa->idev->dev->ifindex); 1267 break; 1268 case IPV6_SADDR_RULE_LABEL: 1269 /* Rule 6: Prefer matching label */ 1270 ret = ipv6_addr_label(net, 1271 &score->ifa->addr, score->addr_type, 1272 score->ifa->idev->dev->ifindex) == dst->label; 1273 break; 1274 case IPV6_SADDR_RULE_PRIVACY: 1275 { 1276 /* Rule 7: Prefer public address 1277 * Note: prefer temporary address if use_tempaddr >= 2 1278 */ 1279 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ? 1280 !!(dst->prefs & IPV6_PREFER_SRC_TMP) : 1281 score->ifa->idev->cnf.use_tempaddr >= 2; 1282 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp; 1283 break; 1284 } 1285 case IPV6_SADDR_RULE_ORCHID: 1286 /* Rule 8-: Prefer ORCHID vs ORCHID or 1287 * non-ORCHID vs non-ORCHID 1288 */ 1289 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^ 1290 ipv6_addr_orchid(dst->addr)); 1291 break; 1292 case IPV6_SADDR_RULE_PREFIX: 1293 /* Rule 8: Use longest matching prefix */ 1294 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr); 1295 if (ret > score->ifa->prefix_len) 1296 ret = score->ifa->prefix_len; 1297 score->matchlen = ret; 1298 break; 1299 default: 1300 ret = 0; 1301 } 1302 1303 if (ret) 1304 __set_bit(i, score->scorebits); 1305 score->rule = i; 1306 out: 1307 return ret; 1308 } 1309 1310 int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev, 1311 const struct in6_addr *daddr, unsigned int prefs, 1312 struct in6_addr *saddr) 1313 { 1314 struct ipv6_saddr_score scores[2], 1315 *score = &scores[0], *hiscore = &scores[1]; 1316 struct ipv6_saddr_dst dst; 1317 struct net_device *dev; 1318 int dst_type; 1319 1320 dst_type = __ipv6_addr_type(daddr); 1321 dst.addr = daddr; 1322 dst.ifindex = dst_dev ? dst_dev->ifindex : 0; 1323 dst.scope = __ipv6_addr_src_scope(dst_type); 1324 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex); 1325 dst.prefs = prefs; 1326 1327 hiscore->rule = -1; 1328 hiscore->ifa = NULL; 1329 1330 rcu_read_lock(); 1331 1332 for_each_netdev_rcu(net, dev) { 1333 struct inet6_dev *idev; 1334 1335 /* Candidate Source Address (section 4) 1336 * - multicast and link-local destination address, 1337 * the set of candidate source address MUST only 1338 * include addresses assigned to interfaces 1339 * belonging to the same link as the outgoing 1340 * interface. 1341 * (- For site-local destination addresses, the 1342 * set of candidate source addresses MUST only 1343 * include addresses assigned to interfaces 1344 * belonging to the same site as the outgoing 1345 * interface.) 1346 */ 1347 if (((dst_type & IPV6_ADDR_MULTICAST) || 1348 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL) && 1349 dst.ifindex && dev->ifindex != dst.ifindex) 1350 continue; 1351 1352 idev = __in6_dev_get(dev); 1353 if (!idev) 1354 continue; 1355 1356 read_lock_bh(&idev->lock); 1357 list_for_each_entry(score->ifa, &idev->addr_list, if_list) { 1358 int i; 1359 1360 /* 1361 * - Tentative Address (RFC2462 section 5.4) 1362 * - A tentative address is not considered 1363 * "assigned to an interface" in the traditional 1364 * sense, unless it is also flagged as optimistic. 1365 * - Candidate Source Address (section 4) 1366 * - In any case, anycast addresses, multicast 1367 * addresses, and the unspecified address MUST 1368 * NOT be included in a candidate set. 1369 */ 1370 if ((score->ifa->flags & IFA_F_TENTATIVE) && 1371 (!(score->ifa->flags & IFA_F_OPTIMISTIC))) 1372 continue; 1373 1374 score->addr_type = __ipv6_addr_type(&score->ifa->addr); 1375 1376 if (unlikely(score->addr_type == IPV6_ADDR_ANY || 1377 score->addr_type & IPV6_ADDR_MULTICAST)) { 1378 LIMIT_NETDEBUG(KERN_DEBUG 1379 "ADDRCONF: unspecified / multicast address " 1380 "assigned as unicast address on %s", 1381 dev->name); 1382 continue; 1383 } 1384 1385 score->rule = -1; 1386 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX); 1387 1388 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) { 1389 int minihiscore, miniscore; 1390 1391 minihiscore = ipv6_get_saddr_eval(net, hiscore, &dst, i); 1392 miniscore = ipv6_get_saddr_eval(net, score, &dst, i); 1393 1394 if (minihiscore > miniscore) { 1395 if (i == IPV6_SADDR_RULE_SCOPE && 1396 score->scopedist > 0) { 1397 /* 1398 * special case: 1399 * each remaining entry 1400 * has too small (not enough) 1401 * scope, because ifa entries 1402 * are sorted by their scope 1403 * values. 1404 */ 1405 goto try_nextdev; 1406 } 1407 break; 1408 } else if (minihiscore < miniscore) { 1409 if (hiscore->ifa) 1410 in6_ifa_put(hiscore->ifa); 1411 1412 in6_ifa_hold(score->ifa); 1413 1414 swap(hiscore, score); 1415 1416 /* restore our iterator */ 1417 score->ifa = hiscore->ifa; 1418 1419 break; 1420 } 1421 } 1422 } 1423 try_nextdev: 1424 read_unlock_bh(&idev->lock); 1425 } 1426 rcu_read_unlock(); 1427 1428 if (!hiscore->ifa) 1429 return -EADDRNOTAVAIL; 1430 1431 *saddr = hiscore->ifa->addr; 1432 in6_ifa_put(hiscore->ifa); 1433 return 0; 1434 } 1435 EXPORT_SYMBOL(ipv6_dev_get_saddr); 1436 1437 int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr, 1438 u32 banned_flags) 1439 { 1440 struct inet6_ifaddr *ifp; 1441 int err = -EADDRNOTAVAIL; 1442 1443 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) { 1444 if (ifp->scope > IFA_LINK) 1445 break; 1446 if (ifp->scope == IFA_LINK && 1447 !(ifp->flags & banned_flags)) { 1448 *addr = ifp->addr; 1449 err = 0; 1450 break; 1451 } 1452 } 1453 return err; 1454 } 1455 1456 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr, 1457 u32 banned_flags) 1458 { 1459 struct inet6_dev *idev; 1460 int err = -EADDRNOTAVAIL; 1461 1462 rcu_read_lock(); 1463 idev = __in6_dev_get(dev); 1464 if (idev) { 1465 read_lock_bh(&idev->lock); 1466 err = __ipv6_get_lladdr(idev, addr, banned_flags); 1467 read_unlock_bh(&idev->lock); 1468 } 1469 rcu_read_unlock(); 1470 return err; 1471 } 1472 1473 static int ipv6_count_addresses(struct inet6_dev *idev) 1474 { 1475 int cnt = 0; 1476 struct inet6_ifaddr *ifp; 1477 1478 read_lock_bh(&idev->lock); 1479 list_for_each_entry(ifp, &idev->addr_list, if_list) 1480 cnt++; 1481 read_unlock_bh(&idev->lock); 1482 return cnt; 1483 } 1484 1485 int ipv6_chk_addr(struct net *net, const struct in6_addr *addr, 1486 const struct net_device *dev, int strict) 1487 { 1488 struct inet6_ifaddr *ifp; 1489 unsigned int hash = inet6_addr_hash(addr); 1490 1491 rcu_read_lock_bh(); 1492 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) { 1493 if (!net_eq(dev_net(ifp->idev->dev), net)) 1494 continue; 1495 if (ipv6_addr_equal(&ifp->addr, addr) && 1496 !(ifp->flags&IFA_F_TENTATIVE) && 1497 (dev == NULL || ifp->idev->dev == dev || 1498 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) { 1499 rcu_read_unlock_bh(); 1500 return 1; 1501 } 1502 } 1503 1504 rcu_read_unlock_bh(); 1505 return 0; 1506 } 1507 EXPORT_SYMBOL(ipv6_chk_addr); 1508 1509 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr, 1510 struct net_device *dev) 1511 { 1512 unsigned int hash = inet6_addr_hash(addr); 1513 struct inet6_ifaddr *ifp; 1514 1515 hlist_for_each_entry(ifp, &inet6_addr_lst[hash], addr_lst) { 1516 if (!net_eq(dev_net(ifp->idev->dev), net)) 1517 continue; 1518 if (ipv6_addr_equal(&ifp->addr, addr)) { 1519 if (dev == NULL || ifp->idev->dev == dev) 1520 return true; 1521 } 1522 } 1523 return false; 1524 } 1525 1526 /* Compares an address/prefix_len with addresses on device @dev. 1527 * If one is found it returns true. 1528 */ 1529 bool ipv6_chk_custom_prefix(const struct in6_addr *addr, 1530 const unsigned int prefix_len, struct net_device *dev) 1531 { 1532 struct inet6_dev *idev; 1533 struct inet6_ifaddr *ifa; 1534 bool ret = false; 1535 1536 rcu_read_lock(); 1537 idev = __in6_dev_get(dev); 1538 if (idev) { 1539 read_lock_bh(&idev->lock); 1540 list_for_each_entry(ifa, &idev->addr_list, if_list) { 1541 ret = ipv6_prefix_equal(addr, &ifa->addr, prefix_len); 1542 if (ret) 1543 break; 1544 } 1545 read_unlock_bh(&idev->lock); 1546 } 1547 rcu_read_unlock(); 1548 1549 return ret; 1550 } 1551 EXPORT_SYMBOL(ipv6_chk_custom_prefix); 1552 1553 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev) 1554 { 1555 struct inet6_dev *idev; 1556 struct inet6_ifaddr *ifa; 1557 int onlink; 1558 1559 onlink = 0; 1560 rcu_read_lock(); 1561 idev = __in6_dev_get(dev); 1562 if (idev) { 1563 read_lock_bh(&idev->lock); 1564 list_for_each_entry(ifa, &idev->addr_list, if_list) { 1565 onlink = ipv6_prefix_equal(addr, &ifa->addr, 1566 ifa->prefix_len); 1567 if (onlink) 1568 break; 1569 } 1570 read_unlock_bh(&idev->lock); 1571 } 1572 rcu_read_unlock(); 1573 return onlink; 1574 } 1575 EXPORT_SYMBOL(ipv6_chk_prefix); 1576 1577 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr, 1578 struct net_device *dev, int strict) 1579 { 1580 struct inet6_ifaddr *ifp, *result = NULL; 1581 unsigned int hash = inet6_addr_hash(addr); 1582 1583 rcu_read_lock_bh(); 1584 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) { 1585 if (!net_eq(dev_net(ifp->idev->dev), net)) 1586 continue; 1587 if (ipv6_addr_equal(&ifp->addr, addr)) { 1588 if (dev == NULL || ifp->idev->dev == dev || 1589 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) { 1590 result = ifp; 1591 in6_ifa_hold(ifp); 1592 break; 1593 } 1594 } 1595 } 1596 rcu_read_unlock_bh(); 1597 1598 return result; 1599 } 1600 1601 /* Gets referenced address, destroys ifaddr */ 1602 1603 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed) 1604 { 1605 if (ifp->flags&IFA_F_PERMANENT) { 1606 spin_lock_bh(&ifp->lock); 1607 addrconf_del_dad_timer(ifp); 1608 ifp->flags |= IFA_F_TENTATIVE; 1609 if (dad_failed) 1610 ifp->flags |= IFA_F_DADFAILED; 1611 spin_unlock_bh(&ifp->lock); 1612 if (dad_failed) 1613 ipv6_ifa_notify(0, ifp); 1614 in6_ifa_put(ifp); 1615 } else if (ifp->flags&IFA_F_TEMPORARY) { 1616 struct inet6_ifaddr *ifpub; 1617 spin_lock_bh(&ifp->lock); 1618 ifpub = ifp->ifpub; 1619 if (ifpub) { 1620 in6_ifa_hold(ifpub); 1621 spin_unlock_bh(&ifp->lock); 1622 ipv6_create_tempaddr(ifpub, ifp); 1623 in6_ifa_put(ifpub); 1624 } else { 1625 spin_unlock_bh(&ifp->lock); 1626 } 1627 ipv6_del_addr(ifp); 1628 } else 1629 ipv6_del_addr(ifp); 1630 } 1631 1632 static int addrconf_dad_end(struct inet6_ifaddr *ifp) 1633 { 1634 int err = -ENOENT; 1635 1636 spin_lock(&ifp->state_lock); 1637 if (ifp->state == INET6_IFADDR_STATE_DAD) { 1638 ifp->state = INET6_IFADDR_STATE_POSTDAD; 1639 err = 0; 1640 } 1641 spin_unlock(&ifp->state_lock); 1642 1643 return err; 1644 } 1645 1646 void addrconf_dad_failure(struct inet6_ifaddr *ifp) 1647 { 1648 struct inet6_dev *idev = ifp->idev; 1649 1650 if (addrconf_dad_end(ifp)) { 1651 in6_ifa_put(ifp); 1652 return; 1653 } 1654 1655 net_info_ratelimited("%s: IPv6 duplicate address %pI6c detected!\n", 1656 ifp->idev->dev->name, &ifp->addr); 1657 1658 if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6) { 1659 struct in6_addr addr; 1660 1661 addr.s6_addr32[0] = htonl(0xfe800000); 1662 addr.s6_addr32[1] = 0; 1663 1664 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) && 1665 ipv6_addr_equal(&ifp->addr, &addr)) { 1666 /* DAD failed for link-local based on MAC address */ 1667 idev->cnf.disable_ipv6 = 1; 1668 1669 pr_info("%s: IPv6 being disabled!\n", 1670 ifp->idev->dev->name); 1671 } 1672 } 1673 1674 addrconf_dad_stop(ifp, 1); 1675 } 1676 1677 /* Join to solicited addr multicast group. */ 1678 1679 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr) 1680 { 1681 struct in6_addr maddr; 1682 1683 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP)) 1684 return; 1685 1686 addrconf_addr_solict_mult(addr, &maddr); 1687 ipv6_dev_mc_inc(dev, &maddr); 1688 } 1689 1690 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr) 1691 { 1692 struct in6_addr maddr; 1693 1694 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP)) 1695 return; 1696 1697 addrconf_addr_solict_mult(addr, &maddr); 1698 __ipv6_dev_mc_dec(idev, &maddr); 1699 } 1700 1701 static void addrconf_join_anycast(struct inet6_ifaddr *ifp) 1702 { 1703 struct in6_addr addr; 1704 if (ifp->prefix_len >= 127) /* RFC 6164 */ 1705 return; 1706 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len); 1707 if (ipv6_addr_any(&addr)) 1708 return; 1709 ipv6_dev_ac_inc(ifp->idev->dev, &addr); 1710 } 1711 1712 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp) 1713 { 1714 struct in6_addr addr; 1715 if (ifp->prefix_len >= 127) /* RFC 6164 */ 1716 return; 1717 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len); 1718 if (ipv6_addr_any(&addr)) 1719 return; 1720 __ipv6_dev_ac_dec(ifp->idev, &addr); 1721 } 1722 1723 static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev) 1724 { 1725 if (dev->addr_len != ETH_ALEN) 1726 return -1; 1727 memcpy(eui, dev->dev_addr, 3); 1728 memcpy(eui + 5, dev->dev_addr + 3, 3); 1729 1730 /* 1731 * The zSeries OSA network cards can be shared among various 1732 * OS instances, but the OSA cards have only one MAC address. 1733 * This leads to duplicate address conflicts in conjunction 1734 * with IPv6 if more than one instance uses the same card. 1735 * 1736 * The driver for these cards can deliver a unique 16-bit 1737 * identifier for each instance sharing the same card. It is 1738 * placed instead of 0xFFFE in the interface identifier. The 1739 * "u" bit of the interface identifier is not inverted in this 1740 * case. Hence the resulting interface identifier has local 1741 * scope according to RFC2373. 1742 */ 1743 if (dev->dev_id) { 1744 eui[3] = (dev->dev_id >> 8) & 0xFF; 1745 eui[4] = dev->dev_id & 0xFF; 1746 } else { 1747 eui[3] = 0xFF; 1748 eui[4] = 0xFE; 1749 eui[0] ^= 2; 1750 } 1751 return 0; 1752 } 1753 1754 static int addrconf_ifid_eui64(u8 *eui, struct net_device *dev) 1755 { 1756 if (dev->addr_len != IEEE802154_ADDR_LEN) 1757 return -1; 1758 memcpy(eui, dev->dev_addr, 8); 1759 eui[0] ^= 2; 1760 return 0; 1761 } 1762 1763 static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev) 1764 { 1765 union fwnet_hwaddr *ha; 1766 1767 if (dev->addr_len != FWNET_ALEN) 1768 return -1; 1769 1770 ha = (union fwnet_hwaddr *)dev->dev_addr; 1771 1772 memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id)); 1773 eui[0] ^= 2; 1774 return 0; 1775 } 1776 1777 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev) 1778 { 1779 /* XXX: inherit EUI-64 from other interface -- yoshfuji */ 1780 if (dev->addr_len != ARCNET_ALEN) 1781 return -1; 1782 memset(eui, 0, 7); 1783 eui[7] = *(u8 *)dev->dev_addr; 1784 return 0; 1785 } 1786 1787 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev) 1788 { 1789 if (dev->addr_len != INFINIBAND_ALEN) 1790 return -1; 1791 memcpy(eui, dev->dev_addr + 12, 8); 1792 eui[0] |= 2; 1793 return 0; 1794 } 1795 1796 static int __ipv6_isatap_ifid(u8 *eui, __be32 addr) 1797 { 1798 if (addr == 0) 1799 return -1; 1800 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) || 1801 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) || 1802 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) || 1803 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) || 1804 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) || 1805 ipv4_is_lbcast(addr)) ? 0x00 : 0x02; 1806 eui[1] = 0; 1807 eui[2] = 0x5E; 1808 eui[3] = 0xFE; 1809 memcpy(eui + 4, &addr, 4); 1810 return 0; 1811 } 1812 1813 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev) 1814 { 1815 if (dev->priv_flags & IFF_ISATAP) 1816 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr); 1817 return -1; 1818 } 1819 1820 static int addrconf_ifid_gre(u8 *eui, struct net_device *dev) 1821 { 1822 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr); 1823 } 1824 1825 static int addrconf_ifid_ip6tnl(u8 *eui, struct net_device *dev) 1826 { 1827 memcpy(eui, dev->perm_addr, 3); 1828 memcpy(eui + 5, dev->perm_addr + 3, 3); 1829 eui[3] = 0xFF; 1830 eui[4] = 0xFE; 1831 eui[0] ^= 2; 1832 return 0; 1833 } 1834 1835 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev) 1836 { 1837 switch (dev->type) { 1838 case ARPHRD_ETHER: 1839 case ARPHRD_FDDI: 1840 return addrconf_ifid_eui48(eui, dev); 1841 case ARPHRD_ARCNET: 1842 return addrconf_ifid_arcnet(eui, dev); 1843 case ARPHRD_INFINIBAND: 1844 return addrconf_ifid_infiniband(eui, dev); 1845 case ARPHRD_SIT: 1846 return addrconf_ifid_sit(eui, dev); 1847 case ARPHRD_IPGRE: 1848 return addrconf_ifid_gre(eui, dev); 1849 case ARPHRD_6LOWPAN: 1850 case ARPHRD_IEEE802154: 1851 return addrconf_ifid_eui64(eui, dev); 1852 case ARPHRD_IEEE1394: 1853 return addrconf_ifid_ieee1394(eui, dev); 1854 case ARPHRD_TUNNEL6: 1855 return addrconf_ifid_ip6tnl(eui, dev); 1856 } 1857 return -1; 1858 } 1859 1860 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev) 1861 { 1862 int err = -1; 1863 struct inet6_ifaddr *ifp; 1864 1865 read_lock_bh(&idev->lock); 1866 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) { 1867 if (ifp->scope > IFA_LINK) 1868 break; 1869 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) { 1870 memcpy(eui, ifp->addr.s6_addr+8, 8); 1871 err = 0; 1872 break; 1873 } 1874 } 1875 read_unlock_bh(&idev->lock); 1876 return err; 1877 } 1878 1879 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */ 1880 static void __ipv6_regen_rndid(struct inet6_dev *idev) 1881 { 1882 regen: 1883 get_random_bytes(idev->rndid, sizeof(idev->rndid)); 1884 idev->rndid[0] &= ~0x02; 1885 1886 /* 1887 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>: 1888 * check if generated address is not inappropriate 1889 * 1890 * - Reserved subnet anycast (RFC 2526) 1891 * 11111101 11....11 1xxxxxxx 1892 * - ISATAP (RFC4214) 6.1 1893 * 00-00-5E-FE-xx-xx-xx-xx 1894 * - value 0 1895 * - XXX: already assigned to an address on the device 1896 */ 1897 if (idev->rndid[0] == 0xfd && 1898 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff && 1899 (idev->rndid[7]&0x80)) 1900 goto regen; 1901 if ((idev->rndid[0]|idev->rndid[1]) == 0) { 1902 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe) 1903 goto regen; 1904 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00) 1905 goto regen; 1906 } 1907 } 1908 1909 static void ipv6_regen_rndid(unsigned long data) 1910 { 1911 struct inet6_dev *idev = (struct inet6_dev *) data; 1912 unsigned long expires; 1913 1914 rcu_read_lock_bh(); 1915 write_lock_bh(&idev->lock); 1916 1917 if (idev->dead) 1918 goto out; 1919 1920 __ipv6_regen_rndid(idev); 1921 1922 expires = jiffies + 1923 idev->cnf.temp_prefered_lft * HZ - 1924 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * 1925 NEIGH_VAR(idev->nd_parms, RETRANS_TIME) - 1926 idev->cnf.max_desync_factor * HZ; 1927 if (time_before(expires, jiffies)) { 1928 pr_warn("%s: too short regeneration interval; timer disabled for %s\n", 1929 __func__, idev->dev->name); 1930 goto out; 1931 } 1932 1933 if (!mod_timer(&idev->regen_timer, expires)) 1934 in6_dev_hold(idev); 1935 1936 out: 1937 write_unlock_bh(&idev->lock); 1938 rcu_read_unlock_bh(); 1939 in6_dev_put(idev); 1940 } 1941 1942 static void __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) 1943 { 1944 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0) 1945 __ipv6_regen_rndid(idev); 1946 } 1947 1948 /* 1949 * Add prefix route. 1950 */ 1951 1952 static void 1953 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev, 1954 unsigned long expires, u32 flags) 1955 { 1956 struct fib6_config cfg = { 1957 .fc_table = RT6_TABLE_PREFIX, 1958 .fc_metric = IP6_RT_PRIO_ADDRCONF, 1959 .fc_ifindex = dev->ifindex, 1960 .fc_expires = expires, 1961 .fc_dst_len = plen, 1962 .fc_flags = RTF_UP | flags, 1963 .fc_nlinfo.nl_net = dev_net(dev), 1964 .fc_protocol = RTPROT_KERNEL, 1965 }; 1966 1967 cfg.fc_dst = *pfx; 1968 1969 /* Prevent useless cloning on PtP SIT. 1970 This thing is done here expecting that the whole 1971 class of non-broadcast devices need not cloning. 1972 */ 1973 #if IS_ENABLED(CONFIG_IPV6_SIT) 1974 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT)) 1975 cfg.fc_flags |= RTF_NONEXTHOP; 1976 #endif 1977 1978 ip6_route_add(&cfg); 1979 } 1980 1981 1982 static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx, 1983 int plen, 1984 const struct net_device *dev, 1985 u32 flags, u32 noflags) 1986 { 1987 struct fib6_node *fn; 1988 struct rt6_info *rt = NULL; 1989 struct fib6_table *table; 1990 1991 table = fib6_get_table(dev_net(dev), RT6_TABLE_PREFIX); 1992 if (table == NULL) 1993 return NULL; 1994 1995 read_lock_bh(&table->tb6_lock); 1996 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0); 1997 if (!fn) 1998 goto out; 1999 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) { 2000 if (rt->dst.dev->ifindex != dev->ifindex) 2001 continue; 2002 if ((rt->rt6i_flags & flags) != flags) 2003 continue; 2004 if ((rt->rt6i_flags & noflags) != 0) 2005 continue; 2006 dst_hold(&rt->dst); 2007 break; 2008 } 2009 out: 2010 read_unlock_bh(&table->tb6_lock); 2011 return rt; 2012 } 2013 2014 2015 /* Create "default" multicast route to the interface */ 2016 2017 static void addrconf_add_mroute(struct net_device *dev) 2018 { 2019 struct fib6_config cfg = { 2020 .fc_table = RT6_TABLE_LOCAL, 2021 .fc_metric = IP6_RT_PRIO_ADDRCONF, 2022 .fc_ifindex = dev->ifindex, 2023 .fc_dst_len = 8, 2024 .fc_flags = RTF_UP, 2025 .fc_nlinfo.nl_net = dev_net(dev), 2026 }; 2027 2028 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0); 2029 2030 ip6_route_add(&cfg); 2031 } 2032 2033 static struct inet6_dev *addrconf_add_dev(struct net_device *dev) 2034 { 2035 struct inet6_dev *idev; 2036 2037 ASSERT_RTNL(); 2038 2039 idev = ipv6_find_idev(dev); 2040 if (!idev) 2041 return ERR_PTR(-ENOBUFS); 2042 2043 if (idev->cnf.disable_ipv6) 2044 return ERR_PTR(-EACCES); 2045 2046 /* Add default multicast route */ 2047 if (!(dev->flags & IFF_LOOPBACK)) 2048 addrconf_add_mroute(dev); 2049 2050 return idev; 2051 } 2052 2053 static void manage_tempaddrs(struct inet6_dev *idev, 2054 struct inet6_ifaddr *ifp, 2055 __u32 valid_lft, __u32 prefered_lft, 2056 bool create, unsigned long now) 2057 { 2058 u32 flags; 2059 struct inet6_ifaddr *ift; 2060 2061 read_lock_bh(&idev->lock); 2062 /* update all temporary addresses in the list */ 2063 list_for_each_entry(ift, &idev->tempaddr_list, tmp_list) { 2064 int age, max_valid, max_prefered; 2065 2066 if (ifp != ift->ifpub) 2067 continue; 2068 2069 /* RFC 4941 section 3.3: 2070 * If a received option will extend the lifetime of a public 2071 * address, the lifetimes of temporary addresses should 2072 * be extended, subject to the overall constraint that no 2073 * temporary addresses should ever remain "valid" or "preferred" 2074 * for a time longer than (TEMP_VALID_LIFETIME) or 2075 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), respectively. 2076 */ 2077 age = (now - ift->cstamp) / HZ; 2078 max_valid = idev->cnf.temp_valid_lft - age; 2079 if (max_valid < 0) 2080 max_valid = 0; 2081 2082 max_prefered = idev->cnf.temp_prefered_lft - 2083 idev->cnf.max_desync_factor - age; 2084 if (max_prefered < 0) 2085 max_prefered = 0; 2086 2087 if (valid_lft > max_valid) 2088 valid_lft = max_valid; 2089 2090 if (prefered_lft > max_prefered) 2091 prefered_lft = max_prefered; 2092 2093 spin_lock(&ift->lock); 2094 flags = ift->flags; 2095 ift->valid_lft = valid_lft; 2096 ift->prefered_lft = prefered_lft; 2097 ift->tstamp = now; 2098 if (prefered_lft > 0) 2099 ift->flags &= ~IFA_F_DEPRECATED; 2100 2101 spin_unlock(&ift->lock); 2102 if (!(flags&IFA_F_TENTATIVE)) 2103 ipv6_ifa_notify(0, ift); 2104 } 2105 2106 if ((create || list_empty(&idev->tempaddr_list)) && 2107 idev->cnf.use_tempaddr > 0) { 2108 /* When a new public address is created as described 2109 * in [ADDRCONF], also create a new temporary address. 2110 * Also create a temporary address if it's enabled but 2111 * no temporary address currently exists. 2112 */ 2113 read_unlock_bh(&idev->lock); 2114 ipv6_create_tempaddr(ifp, NULL); 2115 } else { 2116 read_unlock_bh(&idev->lock); 2117 } 2118 } 2119 2120 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao) 2121 { 2122 struct prefix_info *pinfo; 2123 __u32 valid_lft; 2124 __u32 prefered_lft; 2125 int addr_type; 2126 struct inet6_dev *in6_dev; 2127 struct net *net = dev_net(dev); 2128 2129 pinfo = (struct prefix_info *) opt; 2130 2131 if (len < sizeof(struct prefix_info)) { 2132 ADBG("addrconf: prefix option too short\n"); 2133 return; 2134 } 2135 2136 /* 2137 * Validation checks ([ADDRCONF], page 19) 2138 */ 2139 2140 addr_type = ipv6_addr_type(&pinfo->prefix); 2141 2142 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL)) 2143 return; 2144 2145 valid_lft = ntohl(pinfo->valid); 2146 prefered_lft = ntohl(pinfo->prefered); 2147 2148 if (prefered_lft > valid_lft) { 2149 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n"); 2150 return; 2151 } 2152 2153 in6_dev = in6_dev_get(dev); 2154 2155 if (in6_dev == NULL) { 2156 net_dbg_ratelimited("addrconf: device %s not configured\n", 2157 dev->name); 2158 return; 2159 } 2160 2161 /* 2162 * Two things going on here: 2163 * 1) Add routes for on-link prefixes 2164 * 2) Configure prefixes with the auto flag set 2165 */ 2166 2167 if (pinfo->onlink) { 2168 struct rt6_info *rt; 2169 unsigned long rt_expires; 2170 2171 /* Avoid arithmetic overflow. Really, we could 2172 * save rt_expires in seconds, likely valid_lft, 2173 * but it would require division in fib gc, that it 2174 * not good. 2175 */ 2176 if (HZ > USER_HZ) 2177 rt_expires = addrconf_timeout_fixup(valid_lft, HZ); 2178 else 2179 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ); 2180 2181 if (addrconf_finite_timeout(rt_expires)) 2182 rt_expires *= HZ; 2183 2184 rt = addrconf_get_prefix_route(&pinfo->prefix, 2185 pinfo->prefix_len, 2186 dev, 2187 RTF_ADDRCONF | RTF_PREFIX_RT, 2188 RTF_GATEWAY | RTF_DEFAULT); 2189 2190 if (rt) { 2191 /* Autoconf prefix route */ 2192 if (valid_lft == 0) { 2193 ip6_del_rt(rt); 2194 rt = NULL; 2195 } else if (addrconf_finite_timeout(rt_expires)) { 2196 /* not infinity */ 2197 rt6_set_expires(rt, jiffies + rt_expires); 2198 } else { 2199 rt6_clean_expires(rt); 2200 } 2201 } else if (valid_lft) { 2202 clock_t expires = 0; 2203 int flags = RTF_ADDRCONF | RTF_PREFIX_RT; 2204 if (addrconf_finite_timeout(rt_expires)) { 2205 /* not infinity */ 2206 flags |= RTF_EXPIRES; 2207 expires = jiffies_to_clock_t(rt_expires); 2208 } 2209 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len, 2210 dev, expires, flags); 2211 } 2212 ip6_rt_put(rt); 2213 } 2214 2215 /* Try to figure out our local address for this prefix */ 2216 2217 if (pinfo->autoconf && in6_dev->cnf.autoconf) { 2218 struct inet6_ifaddr *ifp; 2219 struct in6_addr addr; 2220 int create = 0, update_lft = 0; 2221 bool tokenized = false; 2222 2223 if (pinfo->prefix_len == 64) { 2224 memcpy(&addr, &pinfo->prefix, 8); 2225 2226 if (!ipv6_addr_any(&in6_dev->token)) { 2227 read_lock_bh(&in6_dev->lock); 2228 memcpy(addr.s6_addr + 8, 2229 in6_dev->token.s6_addr + 8, 8); 2230 read_unlock_bh(&in6_dev->lock); 2231 tokenized = true; 2232 } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) && 2233 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) { 2234 in6_dev_put(in6_dev); 2235 return; 2236 } 2237 goto ok; 2238 } 2239 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n", 2240 pinfo->prefix_len); 2241 in6_dev_put(in6_dev); 2242 return; 2243 2244 ok: 2245 2246 ifp = ipv6_get_ifaddr(net, &addr, dev, 1); 2247 2248 if (ifp == NULL && valid_lft) { 2249 int max_addresses = in6_dev->cnf.max_addresses; 2250 u32 addr_flags = 0; 2251 2252 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 2253 if (in6_dev->cnf.optimistic_dad && 2254 !net->ipv6.devconf_all->forwarding && sllao) 2255 addr_flags = IFA_F_OPTIMISTIC; 2256 #endif 2257 2258 /* Do not allow to create too much of autoconfigured 2259 * addresses; this would be too easy way to crash kernel. 2260 */ 2261 if (!max_addresses || 2262 ipv6_count_addresses(in6_dev) < max_addresses) 2263 ifp = ipv6_add_addr(in6_dev, &addr, NULL, 2264 pinfo->prefix_len, 2265 addr_type&IPV6_ADDR_SCOPE_MASK, 2266 addr_flags, valid_lft, 2267 prefered_lft); 2268 2269 if (IS_ERR_OR_NULL(ifp)) { 2270 in6_dev_put(in6_dev); 2271 return; 2272 } 2273 2274 ifp->flags |= IFA_F_MANAGETEMPADDR; 2275 update_lft = 0; 2276 create = 1; 2277 ifp->cstamp = jiffies; 2278 ifp->tokenized = tokenized; 2279 addrconf_dad_start(ifp); 2280 } 2281 2282 if (ifp) { 2283 u32 flags; 2284 unsigned long now; 2285 u32 stored_lft; 2286 2287 /* update lifetime (RFC2462 5.5.3 e) */ 2288 spin_lock(&ifp->lock); 2289 now = jiffies; 2290 if (ifp->valid_lft > (now - ifp->tstamp) / HZ) 2291 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ; 2292 else 2293 stored_lft = 0; 2294 if (!update_lft && !create && stored_lft) { 2295 const u32 minimum_lft = min( 2296 stored_lft, (u32)MIN_VALID_LIFETIME); 2297 valid_lft = max(valid_lft, minimum_lft); 2298 2299 /* RFC4862 Section 5.5.3e: 2300 * "Note that the preferred lifetime of the 2301 * corresponding address is always reset to 2302 * the Preferred Lifetime in the received 2303 * Prefix Information option, regardless of 2304 * whether the valid lifetime is also reset or 2305 * ignored." 2306 * 2307 * So we should always update prefered_lft here. 2308 */ 2309 update_lft = 1; 2310 } 2311 2312 if (update_lft) { 2313 ifp->valid_lft = valid_lft; 2314 ifp->prefered_lft = prefered_lft; 2315 ifp->tstamp = now; 2316 flags = ifp->flags; 2317 ifp->flags &= ~IFA_F_DEPRECATED; 2318 spin_unlock(&ifp->lock); 2319 2320 if (!(flags&IFA_F_TENTATIVE)) 2321 ipv6_ifa_notify(0, ifp); 2322 } else 2323 spin_unlock(&ifp->lock); 2324 2325 manage_tempaddrs(in6_dev, ifp, valid_lft, prefered_lft, 2326 create, now); 2327 2328 in6_ifa_put(ifp); 2329 addrconf_verify(0); 2330 } 2331 } 2332 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo); 2333 in6_dev_put(in6_dev); 2334 } 2335 2336 /* 2337 * Set destination address. 2338 * Special case for SIT interfaces where we create a new "virtual" 2339 * device. 2340 */ 2341 int addrconf_set_dstaddr(struct net *net, void __user *arg) 2342 { 2343 struct in6_ifreq ireq; 2344 struct net_device *dev; 2345 int err = -EINVAL; 2346 2347 rtnl_lock(); 2348 2349 err = -EFAULT; 2350 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2351 goto err_exit; 2352 2353 dev = __dev_get_by_index(net, ireq.ifr6_ifindex); 2354 2355 err = -ENODEV; 2356 if (dev == NULL) 2357 goto err_exit; 2358 2359 #if IS_ENABLED(CONFIG_IPV6_SIT) 2360 if (dev->type == ARPHRD_SIT) { 2361 const struct net_device_ops *ops = dev->netdev_ops; 2362 struct ifreq ifr; 2363 struct ip_tunnel_parm p; 2364 2365 err = -EADDRNOTAVAIL; 2366 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4)) 2367 goto err_exit; 2368 2369 memset(&p, 0, sizeof(p)); 2370 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3]; 2371 p.iph.saddr = 0; 2372 p.iph.version = 4; 2373 p.iph.ihl = 5; 2374 p.iph.protocol = IPPROTO_IPV6; 2375 p.iph.ttl = 64; 2376 ifr.ifr_ifru.ifru_data = (__force void __user *)&p; 2377 2378 if (ops->ndo_do_ioctl) { 2379 mm_segment_t oldfs = get_fs(); 2380 2381 set_fs(KERNEL_DS); 2382 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL); 2383 set_fs(oldfs); 2384 } else 2385 err = -EOPNOTSUPP; 2386 2387 if (err == 0) { 2388 err = -ENOBUFS; 2389 dev = __dev_get_by_name(net, p.name); 2390 if (!dev) 2391 goto err_exit; 2392 err = dev_open(dev); 2393 } 2394 } 2395 #endif 2396 2397 err_exit: 2398 rtnl_unlock(); 2399 return err; 2400 } 2401 2402 /* 2403 * Manual configuration of address on an interface 2404 */ 2405 static int inet6_addr_add(struct net *net, int ifindex, 2406 const struct in6_addr *pfx, 2407 const struct in6_addr *peer_pfx, 2408 unsigned int plen, __u32 ifa_flags, 2409 __u32 prefered_lft, __u32 valid_lft) 2410 { 2411 struct inet6_ifaddr *ifp; 2412 struct inet6_dev *idev; 2413 struct net_device *dev; 2414 int scope; 2415 u32 flags; 2416 clock_t expires; 2417 unsigned long timeout; 2418 2419 ASSERT_RTNL(); 2420 2421 if (plen > 128) 2422 return -EINVAL; 2423 2424 /* check the lifetime */ 2425 if (!valid_lft || prefered_lft > valid_lft) 2426 return -EINVAL; 2427 2428 if (ifa_flags & IFA_F_MANAGETEMPADDR && plen != 64) 2429 return -EINVAL; 2430 2431 dev = __dev_get_by_index(net, ifindex); 2432 if (!dev) 2433 return -ENODEV; 2434 2435 idev = addrconf_add_dev(dev); 2436 if (IS_ERR(idev)) 2437 return PTR_ERR(idev); 2438 2439 scope = ipv6_addr_scope(pfx); 2440 2441 timeout = addrconf_timeout_fixup(valid_lft, HZ); 2442 if (addrconf_finite_timeout(timeout)) { 2443 expires = jiffies_to_clock_t(timeout * HZ); 2444 valid_lft = timeout; 2445 flags = RTF_EXPIRES; 2446 } else { 2447 expires = 0; 2448 flags = 0; 2449 ifa_flags |= IFA_F_PERMANENT; 2450 } 2451 2452 timeout = addrconf_timeout_fixup(prefered_lft, HZ); 2453 if (addrconf_finite_timeout(timeout)) { 2454 if (timeout == 0) 2455 ifa_flags |= IFA_F_DEPRECATED; 2456 prefered_lft = timeout; 2457 } 2458 2459 ifp = ipv6_add_addr(idev, pfx, peer_pfx, plen, scope, ifa_flags, 2460 valid_lft, prefered_lft); 2461 2462 if (!IS_ERR(ifp)) { 2463 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) { 2464 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev, 2465 expires, flags); 2466 } 2467 2468 /* 2469 * Note that section 3.1 of RFC 4429 indicates 2470 * that the Optimistic flag should not be set for 2471 * manually configured addresses 2472 */ 2473 addrconf_dad_start(ifp); 2474 if (ifa_flags & IFA_F_MANAGETEMPADDR) 2475 manage_tempaddrs(idev, ifp, valid_lft, prefered_lft, 2476 true, jiffies); 2477 in6_ifa_put(ifp); 2478 addrconf_verify(0); 2479 return 0; 2480 } 2481 2482 return PTR_ERR(ifp); 2483 } 2484 2485 static int inet6_addr_del(struct net *net, int ifindex, const struct in6_addr *pfx, 2486 unsigned int plen) 2487 { 2488 struct inet6_ifaddr *ifp; 2489 struct inet6_dev *idev; 2490 struct net_device *dev; 2491 2492 if (plen > 128) 2493 return -EINVAL; 2494 2495 dev = __dev_get_by_index(net, ifindex); 2496 if (!dev) 2497 return -ENODEV; 2498 2499 if ((idev = __in6_dev_get(dev)) == NULL) 2500 return -ENXIO; 2501 2502 read_lock_bh(&idev->lock); 2503 list_for_each_entry(ifp, &idev->addr_list, if_list) { 2504 if (ifp->prefix_len == plen && 2505 ipv6_addr_equal(pfx, &ifp->addr)) { 2506 in6_ifa_hold(ifp); 2507 read_unlock_bh(&idev->lock); 2508 2509 ipv6_del_addr(ifp); 2510 return 0; 2511 } 2512 } 2513 read_unlock_bh(&idev->lock); 2514 return -EADDRNOTAVAIL; 2515 } 2516 2517 2518 int addrconf_add_ifaddr(struct net *net, void __user *arg) 2519 { 2520 struct in6_ifreq ireq; 2521 int err; 2522 2523 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 2524 return -EPERM; 2525 2526 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2527 return -EFAULT; 2528 2529 rtnl_lock(); 2530 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, NULL, 2531 ireq.ifr6_prefixlen, IFA_F_PERMANENT, 2532 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME); 2533 rtnl_unlock(); 2534 return err; 2535 } 2536 2537 int addrconf_del_ifaddr(struct net *net, void __user *arg) 2538 { 2539 struct in6_ifreq ireq; 2540 int err; 2541 2542 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 2543 return -EPERM; 2544 2545 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2546 return -EFAULT; 2547 2548 rtnl_lock(); 2549 err = inet6_addr_del(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, 2550 ireq.ifr6_prefixlen); 2551 rtnl_unlock(); 2552 return err; 2553 } 2554 2555 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr, 2556 int plen, int scope) 2557 { 2558 struct inet6_ifaddr *ifp; 2559 2560 ifp = ipv6_add_addr(idev, addr, NULL, plen, 2561 scope, IFA_F_PERMANENT, 2562 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME); 2563 if (!IS_ERR(ifp)) { 2564 spin_lock_bh(&ifp->lock); 2565 ifp->flags &= ~IFA_F_TENTATIVE; 2566 spin_unlock_bh(&ifp->lock); 2567 ipv6_ifa_notify(RTM_NEWADDR, ifp); 2568 in6_ifa_put(ifp); 2569 } 2570 } 2571 2572 #if IS_ENABLED(CONFIG_IPV6_SIT) 2573 static void sit_add_v4_addrs(struct inet6_dev *idev) 2574 { 2575 struct in6_addr addr; 2576 struct net_device *dev; 2577 struct net *net = dev_net(idev->dev); 2578 int scope, plen; 2579 u32 pflags = 0; 2580 2581 ASSERT_RTNL(); 2582 2583 memset(&addr, 0, sizeof(struct in6_addr)); 2584 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4); 2585 2586 if (idev->dev->flags&IFF_POINTOPOINT) { 2587 addr.s6_addr32[0] = htonl(0xfe800000); 2588 scope = IFA_LINK; 2589 plen = 64; 2590 } else { 2591 scope = IPV6_ADDR_COMPATv4; 2592 plen = 96; 2593 pflags |= RTF_NONEXTHOP; 2594 } 2595 2596 if (addr.s6_addr32[3]) { 2597 add_addr(idev, &addr, plen, scope); 2598 addrconf_prefix_route(&addr, plen, idev->dev, 0, pflags); 2599 return; 2600 } 2601 2602 for_each_netdev(net, dev) { 2603 struct in_device *in_dev = __in_dev_get_rtnl(dev); 2604 if (in_dev && (dev->flags & IFF_UP)) { 2605 struct in_ifaddr *ifa; 2606 2607 int flag = scope; 2608 2609 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) { 2610 2611 addr.s6_addr32[3] = ifa->ifa_local; 2612 2613 if (ifa->ifa_scope == RT_SCOPE_LINK) 2614 continue; 2615 if (ifa->ifa_scope >= RT_SCOPE_HOST) { 2616 if (idev->dev->flags&IFF_POINTOPOINT) 2617 continue; 2618 flag |= IFA_HOST; 2619 } 2620 2621 add_addr(idev, &addr, plen, flag); 2622 addrconf_prefix_route(&addr, plen, idev->dev, 0, 2623 pflags); 2624 } 2625 } 2626 } 2627 } 2628 #endif 2629 2630 static void init_loopback(struct net_device *dev) 2631 { 2632 struct inet6_dev *idev; 2633 struct net_device *sp_dev; 2634 struct inet6_ifaddr *sp_ifa; 2635 struct rt6_info *sp_rt; 2636 2637 /* ::1 */ 2638 2639 ASSERT_RTNL(); 2640 2641 if ((idev = ipv6_find_idev(dev)) == NULL) { 2642 pr_debug("%s: add_dev failed\n", __func__); 2643 return; 2644 } 2645 2646 add_addr(idev, &in6addr_loopback, 128, IFA_HOST); 2647 2648 /* Add routes to other interface's IPv6 addresses */ 2649 for_each_netdev(dev_net(dev), sp_dev) { 2650 if (!strcmp(sp_dev->name, dev->name)) 2651 continue; 2652 2653 idev = __in6_dev_get(sp_dev); 2654 if (!idev) 2655 continue; 2656 2657 read_lock_bh(&idev->lock); 2658 list_for_each_entry(sp_ifa, &idev->addr_list, if_list) { 2659 2660 if (sp_ifa->flags & (IFA_F_DADFAILED | IFA_F_TENTATIVE)) 2661 continue; 2662 2663 if (sp_ifa->rt) { 2664 /* This dst has been added to garbage list when 2665 * lo device down, release this obsolete dst and 2666 * reallocate a new router for ifa. 2667 */ 2668 if (sp_ifa->rt->dst.obsolete > 0) { 2669 ip6_rt_put(sp_ifa->rt); 2670 sp_ifa->rt = NULL; 2671 } else { 2672 continue; 2673 } 2674 } 2675 2676 sp_rt = addrconf_dst_alloc(idev, &sp_ifa->addr, false); 2677 2678 /* Failure cases are ignored */ 2679 if (!IS_ERR(sp_rt)) { 2680 sp_ifa->rt = sp_rt; 2681 ip6_ins_rt(sp_rt); 2682 } 2683 } 2684 read_unlock_bh(&idev->lock); 2685 } 2686 } 2687 2688 static void addrconf_add_linklocal(struct inet6_dev *idev, const struct in6_addr *addr) 2689 { 2690 struct inet6_ifaddr *ifp; 2691 u32 addr_flags = IFA_F_PERMANENT; 2692 2693 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 2694 if (idev->cnf.optimistic_dad && 2695 !dev_net(idev->dev)->ipv6.devconf_all->forwarding) 2696 addr_flags |= IFA_F_OPTIMISTIC; 2697 #endif 2698 2699 2700 ifp = ipv6_add_addr(idev, addr, NULL, 64, IFA_LINK, addr_flags, 2701 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME); 2702 if (!IS_ERR(ifp)) { 2703 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0); 2704 addrconf_dad_start(ifp); 2705 in6_ifa_put(ifp); 2706 } 2707 } 2708 2709 static void addrconf_dev_config(struct net_device *dev) 2710 { 2711 struct in6_addr addr; 2712 struct inet6_dev *idev; 2713 2714 ASSERT_RTNL(); 2715 2716 if ((dev->type != ARPHRD_ETHER) && 2717 (dev->type != ARPHRD_FDDI) && 2718 (dev->type != ARPHRD_ARCNET) && 2719 (dev->type != ARPHRD_INFINIBAND) && 2720 (dev->type != ARPHRD_IEEE802154) && 2721 (dev->type != ARPHRD_IEEE1394) && 2722 (dev->type != ARPHRD_TUNNEL6) && 2723 (dev->type != ARPHRD_6LOWPAN)) { 2724 /* Alas, we support only Ethernet autoconfiguration. */ 2725 return; 2726 } 2727 2728 idev = addrconf_add_dev(dev); 2729 if (IS_ERR(idev)) 2730 return; 2731 2732 memset(&addr, 0, sizeof(struct in6_addr)); 2733 addr.s6_addr32[0] = htonl(0xFE800000); 2734 2735 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0) 2736 addrconf_add_linklocal(idev, &addr); 2737 } 2738 2739 #if IS_ENABLED(CONFIG_IPV6_SIT) 2740 static void addrconf_sit_config(struct net_device *dev) 2741 { 2742 struct inet6_dev *idev; 2743 2744 ASSERT_RTNL(); 2745 2746 /* 2747 * Configure the tunnel with one of our IPv4 2748 * addresses... we should configure all of 2749 * our v4 addrs in the tunnel 2750 */ 2751 2752 if ((idev = ipv6_find_idev(dev)) == NULL) { 2753 pr_debug("%s: add_dev failed\n", __func__); 2754 return; 2755 } 2756 2757 if (dev->priv_flags & IFF_ISATAP) { 2758 struct in6_addr addr; 2759 2760 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0); 2761 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev)) 2762 addrconf_add_linklocal(idev, &addr); 2763 return; 2764 } 2765 2766 sit_add_v4_addrs(idev); 2767 2768 if (dev->flags&IFF_POINTOPOINT) 2769 addrconf_add_mroute(dev); 2770 } 2771 #endif 2772 2773 #if IS_ENABLED(CONFIG_NET_IPGRE) 2774 static void addrconf_gre_config(struct net_device *dev) 2775 { 2776 struct inet6_dev *idev; 2777 struct in6_addr addr; 2778 2779 ASSERT_RTNL(); 2780 2781 if ((idev = ipv6_find_idev(dev)) == NULL) { 2782 pr_debug("%s: add_dev failed\n", __func__); 2783 return; 2784 } 2785 2786 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0); 2787 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev)) 2788 addrconf_add_linklocal(idev, &addr); 2789 else 2790 addrconf_prefix_route(&addr, 64, dev, 0, 0); 2791 } 2792 #endif 2793 2794 static inline int 2795 ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev) 2796 { 2797 struct in6_addr lladdr; 2798 2799 if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) { 2800 addrconf_add_linklocal(idev, &lladdr); 2801 return 0; 2802 } 2803 return -1; 2804 } 2805 2806 static int addrconf_notify(struct notifier_block *this, unsigned long event, 2807 void *ptr) 2808 { 2809 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 2810 struct inet6_dev *idev = __in6_dev_get(dev); 2811 int run_pending = 0; 2812 int err; 2813 2814 switch (event) { 2815 case NETDEV_REGISTER: 2816 if (!idev && dev->mtu >= IPV6_MIN_MTU) { 2817 idev = ipv6_add_dev(dev); 2818 if (!idev) 2819 return notifier_from_errno(-ENOMEM); 2820 } 2821 break; 2822 2823 case NETDEV_UP: 2824 case NETDEV_CHANGE: 2825 if (dev->flags & IFF_SLAVE) 2826 break; 2827 2828 if (event == NETDEV_UP) { 2829 if (!addrconf_qdisc_ok(dev)) { 2830 /* device is not ready yet. */ 2831 pr_info("ADDRCONF(NETDEV_UP): %s: link is not ready\n", 2832 dev->name); 2833 break; 2834 } 2835 2836 if (!idev && dev->mtu >= IPV6_MIN_MTU) 2837 idev = ipv6_add_dev(dev); 2838 2839 if (idev) { 2840 idev->if_flags |= IF_READY; 2841 run_pending = 1; 2842 } 2843 } else { 2844 if (!addrconf_qdisc_ok(dev)) { 2845 /* device is still not ready. */ 2846 break; 2847 } 2848 2849 if (idev) { 2850 if (idev->if_flags & IF_READY) 2851 /* device is already configured. */ 2852 break; 2853 idev->if_flags |= IF_READY; 2854 } 2855 2856 pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n", 2857 dev->name); 2858 2859 run_pending = 1; 2860 } 2861 2862 switch (dev->type) { 2863 #if IS_ENABLED(CONFIG_IPV6_SIT) 2864 case ARPHRD_SIT: 2865 addrconf_sit_config(dev); 2866 break; 2867 #endif 2868 #if IS_ENABLED(CONFIG_NET_IPGRE) 2869 case ARPHRD_IPGRE: 2870 addrconf_gre_config(dev); 2871 break; 2872 #endif 2873 case ARPHRD_LOOPBACK: 2874 init_loopback(dev); 2875 break; 2876 2877 default: 2878 addrconf_dev_config(dev); 2879 break; 2880 } 2881 2882 if (idev) { 2883 if (run_pending) 2884 addrconf_dad_run(idev); 2885 2886 /* 2887 * If the MTU changed during the interface down, 2888 * when the interface up, the changed MTU must be 2889 * reflected in the idev as well as routers. 2890 */ 2891 if (idev->cnf.mtu6 != dev->mtu && 2892 dev->mtu >= IPV6_MIN_MTU) { 2893 rt6_mtu_change(dev, dev->mtu); 2894 idev->cnf.mtu6 = dev->mtu; 2895 } 2896 idev->tstamp = jiffies; 2897 inet6_ifinfo_notify(RTM_NEWLINK, idev); 2898 2899 /* 2900 * If the changed mtu during down is lower than 2901 * IPV6_MIN_MTU stop IPv6 on this interface. 2902 */ 2903 if (dev->mtu < IPV6_MIN_MTU) 2904 addrconf_ifdown(dev, 1); 2905 } 2906 break; 2907 2908 case NETDEV_CHANGEMTU: 2909 if (idev && dev->mtu >= IPV6_MIN_MTU) { 2910 rt6_mtu_change(dev, dev->mtu); 2911 idev->cnf.mtu6 = dev->mtu; 2912 break; 2913 } 2914 2915 if (!idev && dev->mtu >= IPV6_MIN_MTU) { 2916 idev = ipv6_add_dev(dev); 2917 if (idev) 2918 break; 2919 } 2920 2921 /* 2922 * if MTU under IPV6_MIN_MTU. 2923 * Stop IPv6 on this interface. 2924 */ 2925 2926 case NETDEV_DOWN: 2927 case NETDEV_UNREGISTER: 2928 /* 2929 * Remove all addresses from this interface. 2930 */ 2931 addrconf_ifdown(dev, event != NETDEV_DOWN); 2932 break; 2933 2934 case NETDEV_CHANGENAME: 2935 if (idev) { 2936 snmp6_unregister_dev(idev); 2937 addrconf_sysctl_unregister(idev); 2938 addrconf_sysctl_register(idev); 2939 err = snmp6_register_dev(idev); 2940 if (err) 2941 return notifier_from_errno(err); 2942 } 2943 break; 2944 2945 case NETDEV_PRE_TYPE_CHANGE: 2946 case NETDEV_POST_TYPE_CHANGE: 2947 addrconf_type_change(dev, event); 2948 break; 2949 } 2950 2951 return NOTIFY_OK; 2952 } 2953 2954 /* 2955 * addrconf module should be notified of a device going up 2956 */ 2957 static struct notifier_block ipv6_dev_notf = { 2958 .notifier_call = addrconf_notify, 2959 }; 2960 2961 static void addrconf_type_change(struct net_device *dev, unsigned long event) 2962 { 2963 struct inet6_dev *idev; 2964 ASSERT_RTNL(); 2965 2966 idev = __in6_dev_get(dev); 2967 2968 if (event == NETDEV_POST_TYPE_CHANGE) 2969 ipv6_mc_remap(idev); 2970 else if (event == NETDEV_PRE_TYPE_CHANGE) 2971 ipv6_mc_unmap(idev); 2972 } 2973 2974 static int addrconf_ifdown(struct net_device *dev, int how) 2975 { 2976 struct net *net = dev_net(dev); 2977 struct inet6_dev *idev; 2978 struct inet6_ifaddr *ifa; 2979 int state, i; 2980 2981 ASSERT_RTNL(); 2982 2983 rt6_ifdown(net, dev); 2984 neigh_ifdown(&nd_tbl, dev); 2985 2986 idev = __in6_dev_get(dev); 2987 if (idev == NULL) 2988 return -ENODEV; 2989 2990 /* 2991 * Step 1: remove reference to ipv6 device from parent device. 2992 * Do not dev_put! 2993 */ 2994 if (how) { 2995 idev->dead = 1; 2996 2997 /* protected by rtnl_lock */ 2998 RCU_INIT_POINTER(dev->ip6_ptr, NULL); 2999 3000 /* Step 1.5: remove snmp6 entry */ 3001 snmp6_unregister_dev(idev); 3002 3003 } 3004 3005 /* Step 2: clear hash table */ 3006 for (i = 0; i < IN6_ADDR_HSIZE; i++) { 3007 struct hlist_head *h = &inet6_addr_lst[i]; 3008 3009 spin_lock_bh(&addrconf_hash_lock); 3010 restart: 3011 hlist_for_each_entry_rcu(ifa, h, addr_lst) { 3012 if (ifa->idev == idev) { 3013 hlist_del_init_rcu(&ifa->addr_lst); 3014 addrconf_del_dad_timer(ifa); 3015 goto restart; 3016 } 3017 } 3018 spin_unlock_bh(&addrconf_hash_lock); 3019 } 3020 3021 write_lock_bh(&idev->lock); 3022 3023 addrconf_del_rs_timer(idev); 3024 3025 /* Step 2: clear flags for stateless addrconf */ 3026 if (!how) 3027 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY); 3028 3029 if (how && del_timer(&idev->regen_timer)) 3030 in6_dev_put(idev); 3031 3032 /* Step 3: clear tempaddr list */ 3033 while (!list_empty(&idev->tempaddr_list)) { 3034 ifa = list_first_entry(&idev->tempaddr_list, 3035 struct inet6_ifaddr, tmp_list); 3036 list_del(&ifa->tmp_list); 3037 write_unlock_bh(&idev->lock); 3038 spin_lock_bh(&ifa->lock); 3039 3040 if (ifa->ifpub) { 3041 in6_ifa_put(ifa->ifpub); 3042 ifa->ifpub = NULL; 3043 } 3044 spin_unlock_bh(&ifa->lock); 3045 in6_ifa_put(ifa); 3046 write_lock_bh(&idev->lock); 3047 } 3048 3049 while (!list_empty(&idev->addr_list)) { 3050 ifa = list_first_entry(&idev->addr_list, 3051 struct inet6_ifaddr, if_list); 3052 addrconf_del_dad_timer(ifa); 3053 3054 list_del(&ifa->if_list); 3055 3056 write_unlock_bh(&idev->lock); 3057 3058 spin_lock_bh(&ifa->state_lock); 3059 state = ifa->state; 3060 ifa->state = INET6_IFADDR_STATE_DEAD; 3061 spin_unlock_bh(&ifa->state_lock); 3062 3063 if (state != INET6_IFADDR_STATE_DEAD) { 3064 __ipv6_ifa_notify(RTM_DELADDR, ifa); 3065 inet6addr_notifier_call_chain(NETDEV_DOWN, ifa); 3066 } 3067 in6_ifa_put(ifa); 3068 3069 write_lock_bh(&idev->lock); 3070 } 3071 3072 write_unlock_bh(&idev->lock); 3073 3074 /* Step 5: Discard multicast list */ 3075 if (how) 3076 ipv6_mc_destroy_dev(idev); 3077 else 3078 ipv6_mc_down(idev); 3079 3080 idev->tstamp = jiffies; 3081 3082 /* Last: Shot the device (if unregistered) */ 3083 if (how) { 3084 addrconf_sysctl_unregister(idev); 3085 neigh_parms_release(&nd_tbl, idev->nd_parms); 3086 neigh_ifdown(&nd_tbl, dev); 3087 in6_dev_put(idev); 3088 } 3089 return 0; 3090 } 3091 3092 static void addrconf_rs_timer(unsigned long data) 3093 { 3094 struct inet6_dev *idev = (struct inet6_dev *)data; 3095 struct net_device *dev = idev->dev; 3096 struct in6_addr lladdr; 3097 3098 write_lock(&idev->lock); 3099 if (idev->dead || !(idev->if_flags & IF_READY)) 3100 goto out; 3101 3102 if (!ipv6_accept_ra(idev)) 3103 goto out; 3104 3105 /* Announcement received after solicitation was sent */ 3106 if (idev->if_flags & IF_RA_RCVD) 3107 goto out; 3108 3109 if (idev->rs_probes++ < idev->cnf.rtr_solicits) { 3110 write_unlock(&idev->lock); 3111 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE)) 3112 ndisc_send_rs(dev, &lladdr, 3113 &in6addr_linklocal_allrouters); 3114 else 3115 goto put; 3116 3117 write_lock(&idev->lock); 3118 /* The wait after the last probe can be shorter */ 3119 addrconf_mod_rs_timer(idev, (idev->rs_probes == 3120 idev->cnf.rtr_solicits) ? 3121 idev->cnf.rtr_solicit_delay : 3122 idev->cnf.rtr_solicit_interval); 3123 } else { 3124 /* 3125 * Note: we do not support deprecated "all on-link" 3126 * assumption any longer. 3127 */ 3128 pr_debug("%s: no IPv6 routers present\n", idev->dev->name); 3129 } 3130 3131 out: 3132 write_unlock(&idev->lock); 3133 put: 3134 in6_dev_put(idev); 3135 } 3136 3137 /* 3138 * Duplicate Address Detection 3139 */ 3140 static void addrconf_dad_kick(struct inet6_ifaddr *ifp) 3141 { 3142 unsigned long rand_num; 3143 struct inet6_dev *idev = ifp->idev; 3144 3145 if (ifp->flags & IFA_F_OPTIMISTIC) 3146 rand_num = 0; 3147 else 3148 rand_num = prandom_u32() % (idev->cnf.rtr_solicit_delay ? : 1); 3149 3150 ifp->dad_probes = idev->cnf.dad_transmits; 3151 addrconf_mod_dad_timer(ifp, rand_num); 3152 } 3153 3154 static void addrconf_dad_start(struct inet6_ifaddr *ifp) 3155 { 3156 struct inet6_dev *idev = ifp->idev; 3157 struct net_device *dev = idev->dev; 3158 3159 addrconf_join_solict(dev, &ifp->addr); 3160 3161 prandom_seed((__force u32) ifp->addr.s6_addr32[3]); 3162 3163 read_lock_bh(&idev->lock); 3164 spin_lock(&ifp->lock); 3165 if (ifp->state == INET6_IFADDR_STATE_DEAD) 3166 goto out; 3167 3168 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) || 3169 idev->cnf.accept_dad < 1 || 3170 !(ifp->flags&IFA_F_TENTATIVE) || 3171 ifp->flags & IFA_F_NODAD) { 3172 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED); 3173 spin_unlock(&ifp->lock); 3174 read_unlock_bh(&idev->lock); 3175 3176 addrconf_dad_completed(ifp); 3177 return; 3178 } 3179 3180 if (!(idev->if_flags & IF_READY)) { 3181 spin_unlock(&ifp->lock); 3182 read_unlock_bh(&idev->lock); 3183 /* 3184 * If the device is not ready: 3185 * - keep it tentative if it is a permanent address. 3186 * - otherwise, kill it. 3187 */ 3188 in6_ifa_hold(ifp); 3189 addrconf_dad_stop(ifp, 0); 3190 return; 3191 } 3192 3193 /* 3194 * Optimistic nodes can start receiving 3195 * Frames right away 3196 */ 3197 if (ifp->flags & IFA_F_OPTIMISTIC) 3198 ip6_ins_rt(ifp->rt); 3199 3200 addrconf_dad_kick(ifp); 3201 out: 3202 spin_unlock(&ifp->lock); 3203 read_unlock_bh(&idev->lock); 3204 } 3205 3206 static void addrconf_dad_timer(unsigned long data) 3207 { 3208 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data; 3209 struct inet6_dev *idev = ifp->idev; 3210 struct in6_addr mcaddr; 3211 3212 if (!ifp->dad_probes && addrconf_dad_end(ifp)) 3213 goto out; 3214 3215 write_lock(&idev->lock); 3216 if (idev->dead || !(idev->if_flags & IF_READY)) { 3217 write_unlock(&idev->lock); 3218 goto out; 3219 } 3220 3221 spin_lock(&ifp->lock); 3222 if (ifp->state == INET6_IFADDR_STATE_DEAD) { 3223 spin_unlock(&ifp->lock); 3224 write_unlock(&idev->lock); 3225 goto out; 3226 } 3227 3228 if (ifp->dad_probes == 0) { 3229 /* 3230 * DAD was successful 3231 */ 3232 3233 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED); 3234 spin_unlock(&ifp->lock); 3235 write_unlock(&idev->lock); 3236 3237 addrconf_dad_completed(ifp); 3238 3239 goto out; 3240 } 3241 3242 ifp->dad_probes--; 3243 addrconf_mod_dad_timer(ifp, 3244 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME)); 3245 spin_unlock(&ifp->lock); 3246 write_unlock(&idev->lock); 3247 3248 /* send a neighbour solicitation for our addr */ 3249 addrconf_addr_solict_mult(&ifp->addr, &mcaddr); 3250 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &in6addr_any); 3251 out: 3252 in6_ifa_put(ifp); 3253 } 3254 3255 /* ifp->idev must be at least read locked */ 3256 static bool ipv6_lonely_lladdr(struct inet6_ifaddr *ifp) 3257 { 3258 struct inet6_ifaddr *ifpiter; 3259 struct inet6_dev *idev = ifp->idev; 3260 3261 list_for_each_entry_reverse(ifpiter, &idev->addr_list, if_list) { 3262 if (ifpiter->scope > IFA_LINK) 3263 break; 3264 if (ifp != ifpiter && ifpiter->scope == IFA_LINK && 3265 (ifpiter->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE| 3266 IFA_F_OPTIMISTIC|IFA_F_DADFAILED)) == 3267 IFA_F_PERMANENT) 3268 return false; 3269 } 3270 return true; 3271 } 3272 3273 static void addrconf_dad_completed(struct inet6_ifaddr *ifp) 3274 { 3275 struct net_device *dev = ifp->idev->dev; 3276 struct in6_addr lladdr; 3277 bool send_rs, send_mld; 3278 3279 addrconf_del_dad_timer(ifp); 3280 3281 /* 3282 * Configure the address for reception. Now it is valid. 3283 */ 3284 3285 ipv6_ifa_notify(RTM_NEWADDR, ifp); 3286 3287 /* If added prefix is link local and we are prepared to process 3288 router advertisements, start sending router solicitations. 3289 */ 3290 3291 read_lock_bh(&ifp->idev->lock); 3292 send_mld = ifp->scope == IFA_LINK && ipv6_lonely_lladdr(ifp); 3293 send_rs = send_mld && 3294 ipv6_accept_ra(ifp->idev) && 3295 ifp->idev->cnf.rtr_solicits > 0 && 3296 (dev->flags&IFF_LOOPBACK) == 0; 3297 read_unlock_bh(&ifp->idev->lock); 3298 3299 /* While dad is in progress mld report's source address is in6_addrany. 3300 * Resend with proper ll now. 3301 */ 3302 if (send_mld) 3303 ipv6_mc_dad_complete(ifp->idev); 3304 3305 if (send_rs) { 3306 /* 3307 * If a host as already performed a random delay 3308 * [...] as part of DAD [...] there is no need 3309 * to delay again before sending the first RS 3310 */ 3311 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE)) 3312 return; 3313 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters); 3314 3315 write_lock_bh(&ifp->idev->lock); 3316 spin_lock(&ifp->lock); 3317 ifp->idev->rs_probes = 1; 3318 ifp->idev->if_flags |= IF_RS_SENT; 3319 addrconf_mod_rs_timer(ifp->idev, 3320 ifp->idev->cnf.rtr_solicit_interval); 3321 spin_unlock(&ifp->lock); 3322 write_unlock_bh(&ifp->idev->lock); 3323 } 3324 } 3325 3326 static void addrconf_dad_run(struct inet6_dev *idev) 3327 { 3328 struct inet6_ifaddr *ifp; 3329 3330 read_lock_bh(&idev->lock); 3331 list_for_each_entry(ifp, &idev->addr_list, if_list) { 3332 spin_lock(&ifp->lock); 3333 if (ifp->flags & IFA_F_TENTATIVE && 3334 ifp->state == INET6_IFADDR_STATE_DAD) 3335 addrconf_dad_kick(ifp); 3336 spin_unlock(&ifp->lock); 3337 } 3338 read_unlock_bh(&idev->lock); 3339 } 3340 3341 #ifdef CONFIG_PROC_FS 3342 struct if6_iter_state { 3343 struct seq_net_private p; 3344 int bucket; 3345 int offset; 3346 }; 3347 3348 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos) 3349 { 3350 struct inet6_ifaddr *ifa = NULL; 3351 struct if6_iter_state *state = seq->private; 3352 struct net *net = seq_file_net(seq); 3353 int p = 0; 3354 3355 /* initial bucket if pos is 0 */ 3356 if (pos == 0) { 3357 state->bucket = 0; 3358 state->offset = 0; 3359 } 3360 3361 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) { 3362 hlist_for_each_entry_rcu_bh(ifa, &inet6_addr_lst[state->bucket], 3363 addr_lst) { 3364 if (!net_eq(dev_net(ifa->idev->dev), net)) 3365 continue; 3366 /* sync with offset */ 3367 if (p < state->offset) { 3368 p++; 3369 continue; 3370 } 3371 state->offset++; 3372 return ifa; 3373 } 3374 3375 /* prepare for next bucket */ 3376 state->offset = 0; 3377 p = 0; 3378 } 3379 return NULL; 3380 } 3381 3382 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, 3383 struct inet6_ifaddr *ifa) 3384 { 3385 struct if6_iter_state *state = seq->private; 3386 struct net *net = seq_file_net(seq); 3387 3388 hlist_for_each_entry_continue_rcu_bh(ifa, addr_lst) { 3389 if (!net_eq(dev_net(ifa->idev->dev), net)) 3390 continue; 3391 state->offset++; 3392 return ifa; 3393 } 3394 3395 while (++state->bucket < IN6_ADDR_HSIZE) { 3396 state->offset = 0; 3397 hlist_for_each_entry_rcu_bh(ifa, 3398 &inet6_addr_lst[state->bucket], addr_lst) { 3399 if (!net_eq(dev_net(ifa->idev->dev), net)) 3400 continue; 3401 state->offset++; 3402 return ifa; 3403 } 3404 } 3405 3406 return NULL; 3407 } 3408 3409 static void *if6_seq_start(struct seq_file *seq, loff_t *pos) 3410 __acquires(rcu_bh) 3411 { 3412 rcu_read_lock_bh(); 3413 return if6_get_first(seq, *pos); 3414 } 3415 3416 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos) 3417 { 3418 struct inet6_ifaddr *ifa; 3419 3420 ifa = if6_get_next(seq, v); 3421 ++*pos; 3422 return ifa; 3423 } 3424 3425 static void if6_seq_stop(struct seq_file *seq, void *v) 3426 __releases(rcu_bh) 3427 { 3428 rcu_read_unlock_bh(); 3429 } 3430 3431 static int if6_seq_show(struct seq_file *seq, void *v) 3432 { 3433 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v; 3434 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n", 3435 &ifp->addr, 3436 ifp->idev->dev->ifindex, 3437 ifp->prefix_len, 3438 ifp->scope, 3439 (u8) ifp->flags, 3440 ifp->idev->dev->name); 3441 return 0; 3442 } 3443 3444 static const struct seq_operations if6_seq_ops = { 3445 .start = if6_seq_start, 3446 .next = if6_seq_next, 3447 .show = if6_seq_show, 3448 .stop = if6_seq_stop, 3449 }; 3450 3451 static int if6_seq_open(struct inode *inode, struct file *file) 3452 { 3453 return seq_open_net(inode, file, &if6_seq_ops, 3454 sizeof(struct if6_iter_state)); 3455 } 3456 3457 static const struct file_operations if6_fops = { 3458 .owner = THIS_MODULE, 3459 .open = if6_seq_open, 3460 .read = seq_read, 3461 .llseek = seq_lseek, 3462 .release = seq_release_net, 3463 }; 3464 3465 static int __net_init if6_proc_net_init(struct net *net) 3466 { 3467 if (!proc_create("if_inet6", S_IRUGO, net->proc_net, &if6_fops)) 3468 return -ENOMEM; 3469 return 0; 3470 } 3471 3472 static void __net_exit if6_proc_net_exit(struct net *net) 3473 { 3474 remove_proc_entry("if_inet6", net->proc_net); 3475 } 3476 3477 static struct pernet_operations if6_proc_net_ops = { 3478 .init = if6_proc_net_init, 3479 .exit = if6_proc_net_exit, 3480 }; 3481 3482 int __init if6_proc_init(void) 3483 { 3484 return register_pernet_subsys(&if6_proc_net_ops); 3485 } 3486 3487 void if6_proc_exit(void) 3488 { 3489 unregister_pernet_subsys(&if6_proc_net_ops); 3490 } 3491 #endif /* CONFIG_PROC_FS */ 3492 3493 #if IS_ENABLED(CONFIG_IPV6_MIP6) 3494 /* Check if address is a home address configured on any interface. */ 3495 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr) 3496 { 3497 int ret = 0; 3498 struct inet6_ifaddr *ifp = NULL; 3499 unsigned int hash = inet6_addr_hash(addr); 3500 3501 rcu_read_lock_bh(); 3502 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) { 3503 if (!net_eq(dev_net(ifp->idev->dev), net)) 3504 continue; 3505 if (ipv6_addr_equal(&ifp->addr, addr) && 3506 (ifp->flags & IFA_F_HOMEADDRESS)) { 3507 ret = 1; 3508 break; 3509 } 3510 } 3511 rcu_read_unlock_bh(); 3512 return ret; 3513 } 3514 #endif 3515 3516 /* 3517 * Periodic address status verification 3518 */ 3519 3520 static void addrconf_verify(unsigned long foo) 3521 { 3522 unsigned long now, next, next_sec, next_sched; 3523 struct inet6_ifaddr *ifp; 3524 int i; 3525 3526 rcu_read_lock_bh(); 3527 spin_lock(&addrconf_verify_lock); 3528 now = jiffies; 3529 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY); 3530 3531 del_timer(&addr_chk_timer); 3532 3533 for (i = 0; i < IN6_ADDR_HSIZE; i++) { 3534 restart: 3535 hlist_for_each_entry_rcu_bh(ifp, 3536 &inet6_addr_lst[i], addr_lst) { 3537 unsigned long age; 3538 3539 /* When setting preferred_lft to a value not zero or 3540 * infinity, while valid_lft is infinity 3541 * IFA_F_PERMANENT has a non-infinity life time. 3542 */ 3543 if ((ifp->flags & IFA_F_PERMANENT) && 3544 (ifp->prefered_lft == INFINITY_LIFE_TIME)) 3545 continue; 3546 3547 spin_lock(&ifp->lock); 3548 /* We try to batch several events at once. */ 3549 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ; 3550 3551 if (ifp->valid_lft != INFINITY_LIFE_TIME && 3552 age >= ifp->valid_lft) { 3553 spin_unlock(&ifp->lock); 3554 in6_ifa_hold(ifp); 3555 ipv6_del_addr(ifp); 3556 goto restart; 3557 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) { 3558 spin_unlock(&ifp->lock); 3559 continue; 3560 } else if (age >= ifp->prefered_lft) { 3561 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */ 3562 int deprecate = 0; 3563 3564 if (!(ifp->flags&IFA_F_DEPRECATED)) { 3565 deprecate = 1; 3566 ifp->flags |= IFA_F_DEPRECATED; 3567 } 3568 3569 if ((ifp->valid_lft != INFINITY_LIFE_TIME) && 3570 (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))) 3571 next = ifp->tstamp + ifp->valid_lft * HZ; 3572 3573 spin_unlock(&ifp->lock); 3574 3575 if (deprecate) { 3576 in6_ifa_hold(ifp); 3577 3578 ipv6_ifa_notify(0, ifp); 3579 in6_ifa_put(ifp); 3580 goto restart; 3581 } 3582 } else if ((ifp->flags&IFA_F_TEMPORARY) && 3583 !(ifp->flags&IFA_F_TENTATIVE)) { 3584 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry * 3585 ifp->idev->cnf.dad_transmits * 3586 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME) / HZ; 3587 3588 if (age >= ifp->prefered_lft - regen_advance) { 3589 struct inet6_ifaddr *ifpub = ifp->ifpub; 3590 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 3591 next = ifp->tstamp + ifp->prefered_lft * HZ; 3592 if (!ifp->regen_count && ifpub) { 3593 ifp->regen_count++; 3594 in6_ifa_hold(ifp); 3595 in6_ifa_hold(ifpub); 3596 spin_unlock(&ifp->lock); 3597 3598 spin_lock(&ifpub->lock); 3599 ifpub->regen_count = 0; 3600 spin_unlock(&ifpub->lock); 3601 ipv6_create_tempaddr(ifpub, ifp); 3602 in6_ifa_put(ifpub); 3603 in6_ifa_put(ifp); 3604 goto restart; 3605 } 3606 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next)) 3607 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ; 3608 spin_unlock(&ifp->lock); 3609 } else { 3610 /* ifp->prefered_lft <= ifp->valid_lft */ 3611 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 3612 next = ifp->tstamp + ifp->prefered_lft * HZ; 3613 spin_unlock(&ifp->lock); 3614 } 3615 } 3616 } 3617 3618 next_sec = round_jiffies_up(next); 3619 next_sched = next; 3620 3621 /* If rounded timeout is accurate enough, accept it. */ 3622 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ)) 3623 next_sched = next_sec; 3624 3625 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */ 3626 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX)) 3627 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX; 3628 3629 ADBG(KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n", 3630 now, next, next_sec, next_sched); 3631 3632 addr_chk_timer.expires = next_sched; 3633 add_timer(&addr_chk_timer); 3634 spin_unlock(&addrconf_verify_lock); 3635 rcu_read_unlock_bh(); 3636 } 3637 3638 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local, 3639 struct in6_addr **peer_pfx) 3640 { 3641 struct in6_addr *pfx = NULL; 3642 3643 *peer_pfx = NULL; 3644 3645 if (addr) 3646 pfx = nla_data(addr); 3647 3648 if (local) { 3649 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx))) 3650 *peer_pfx = pfx; 3651 pfx = nla_data(local); 3652 } 3653 3654 return pfx; 3655 } 3656 3657 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = { 3658 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) }, 3659 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) }, 3660 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) }, 3661 [IFA_FLAGS] = { .len = sizeof(u32) }, 3662 }; 3663 3664 static int 3665 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh) 3666 { 3667 struct net *net = sock_net(skb->sk); 3668 struct ifaddrmsg *ifm; 3669 struct nlattr *tb[IFA_MAX+1]; 3670 struct in6_addr *pfx, *peer_pfx; 3671 int err; 3672 3673 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy); 3674 if (err < 0) 3675 return err; 3676 3677 ifm = nlmsg_data(nlh); 3678 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx); 3679 if (pfx == NULL) 3680 return -EINVAL; 3681 3682 return inet6_addr_del(net, ifm->ifa_index, pfx, ifm->ifa_prefixlen); 3683 } 3684 3685 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u32 ifa_flags, 3686 u32 prefered_lft, u32 valid_lft) 3687 { 3688 u32 flags; 3689 clock_t expires; 3690 unsigned long timeout; 3691 bool was_managetempaddr; 3692 bool had_prefixroute; 3693 3694 if (!valid_lft || (prefered_lft > valid_lft)) 3695 return -EINVAL; 3696 3697 if (ifa_flags & IFA_F_MANAGETEMPADDR && 3698 (ifp->flags & IFA_F_TEMPORARY || ifp->prefix_len != 64)) 3699 return -EINVAL; 3700 3701 timeout = addrconf_timeout_fixup(valid_lft, HZ); 3702 if (addrconf_finite_timeout(timeout)) { 3703 expires = jiffies_to_clock_t(timeout * HZ); 3704 valid_lft = timeout; 3705 flags = RTF_EXPIRES; 3706 } else { 3707 expires = 0; 3708 flags = 0; 3709 ifa_flags |= IFA_F_PERMANENT; 3710 } 3711 3712 timeout = addrconf_timeout_fixup(prefered_lft, HZ); 3713 if (addrconf_finite_timeout(timeout)) { 3714 if (timeout == 0) 3715 ifa_flags |= IFA_F_DEPRECATED; 3716 prefered_lft = timeout; 3717 } 3718 3719 spin_lock_bh(&ifp->lock); 3720 was_managetempaddr = ifp->flags & IFA_F_MANAGETEMPADDR; 3721 had_prefixroute = ifp->flags & IFA_F_PERMANENT && 3722 !(ifp->flags & IFA_F_NOPREFIXROUTE); 3723 ifp->flags &= ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | 3724 IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR | 3725 IFA_F_NOPREFIXROUTE); 3726 ifp->flags |= ifa_flags; 3727 ifp->tstamp = jiffies; 3728 ifp->valid_lft = valid_lft; 3729 ifp->prefered_lft = prefered_lft; 3730 3731 spin_unlock_bh(&ifp->lock); 3732 if (!(ifp->flags&IFA_F_TENTATIVE)) 3733 ipv6_ifa_notify(0, ifp); 3734 3735 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) { 3736 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev, 3737 expires, flags); 3738 } else if (had_prefixroute) { 3739 enum cleanup_prefix_rt_t action; 3740 unsigned long rt_expires; 3741 3742 write_lock_bh(&ifp->idev->lock); 3743 action = check_cleanup_prefix_route(ifp, &rt_expires); 3744 write_unlock_bh(&ifp->idev->lock); 3745 3746 if (action != CLEANUP_PREFIX_RT_NOP) { 3747 cleanup_prefix_route(ifp, rt_expires, 3748 action == CLEANUP_PREFIX_RT_DEL); 3749 } 3750 } 3751 3752 if (was_managetempaddr || ifp->flags & IFA_F_MANAGETEMPADDR) { 3753 if (was_managetempaddr && !(ifp->flags & IFA_F_MANAGETEMPADDR)) 3754 valid_lft = prefered_lft = 0; 3755 manage_tempaddrs(ifp->idev, ifp, valid_lft, prefered_lft, 3756 !was_managetempaddr, jiffies); 3757 } 3758 3759 addrconf_verify(0); 3760 3761 return 0; 3762 } 3763 3764 static int 3765 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh) 3766 { 3767 struct net *net = sock_net(skb->sk); 3768 struct ifaddrmsg *ifm; 3769 struct nlattr *tb[IFA_MAX+1]; 3770 struct in6_addr *pfx, *peer_pfx; 3771 struct inet6_ifaddr *ifa; 3772 struct net_device *dev; 3773 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME; 3774 u32 ifa_flags; 3775 int err; 3776 3777 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy); 3778 if (err < 0) 3779 return err; 3780 3781 ifm = nlmsg_data(nlh); 3782 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx); 3783 if (pfx == NULL) 3784 return -EINVAL; 3785 3786 if (tb[IFA_CACHEINFO]) { 3787 struct ifa_cacheinfo *ci; 3788 3789 ci = nla_data(tb[IFA_CACHEINFO]); 3790 valid_lft = ci->ifa_valid; 3791 preferred_lft = ci->ifa_prefered; 3792 } else { 3793 preferred_lft = INFINITY_LIFE_TIME; 3794 valid_lft = INFINITY_LIFE_TIME; 3795 } 3796 3797 dev = __dev_get_by_index(net, ifm->ifa_index); 3798 if (dev == NULL) 3799 return -ENODEV; 3800 3801 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags; 3802 3803 /* We ignore other flags so far. */ 3804 ifa_flags &= IFA_F_NODAD | IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR | 3805 IFA_F_NOPREFIXROUTE; 3806 3807 ifa = ipv6_get_ifaddr(net, pfx, dev, 1); 3808 if (ifa == NULL) { 3809 /* 3810 * It would be best to check for !NLM_F_CREATE here but 3811 * userspace already relies on not having to provide this. 3812 */ 3813 return inet6_addr_add(net, ifm->ifa_index, pfx, peer_pfx, 3814 ifm->ifa_prefixlen, ifa_flags, 3815 preferred_lft, valid_lft); 3816 } 3817 3818 if (nlh->nlmsg_flags & NLM_F_EXCL || 3819 !(nlh->nlmsg_flags & NLM_F_REPLACE)) 3820 err = -EEXIST; 3821 else 3822 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft); 3823 3824 in6_ifa_put(ifa); 3825 3826 return err; 3827 } 3828 3829 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u32 flags, 3830 u8 scope, int ifindex) 3831 { 3832 struct ifaddrmsg *ifm; 3833 3834 ifm = nlmsg_data(nlh); 3835 ifm->ifa_family = AF_INET6; 3836 ifm->ifa_prefixlen = prefixlen; 3837 ifm->ifa_flags = flags; 3838 ifm->ifa_scope = scope; 3839 ifm->ifa_index = ifindex; 3840 } 3841 3842 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp, 3843 unsigned long tstamp, u32 preferred, u32 valid) 3844 { 3845 struct ifa_cacheinfo ci; 3846 3847 ci.cstamp = cstamp_delta(cstamp); 3848 ci.tstamp = cstamp_delta(tstamp); 3849 ci.ifa_prefered = preferred; 3850 ci.ifa_valid = valid; 3851 3852 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci); 3853 } 3854 3855 static inline int rt_scope(int ifa_scope) 3856 { 3857 if (ifa_scope & IFA_HOST) 3858 return RT_SCOPE_HOST; 3859 else if (ifa_scope & IFA_LINK) 3860 return RT_SCOPE_LINK; 3861 else if (ifa_scope & IFA_SITE) 3862 return RT_SCOPE_SITE; 3863 else 3864 return RT_SCOPE_UNIVERSE; 3865 } 3866 3867 static inline int inet6_ifaddr_msgsize(void) 3868 { 3869 return NLMSG_ALIGN(sizeof(struct ifaddrmsg)) 3870 + nla_total_size(16) /* IFA_LOCAL */ 3871 + nla_total_size(16) /* IFA_ADDRESS */ 3872 + nla_total_size(sizeof(struct ifa_cacheinfo)) 3873 + nla_total_size(4) /* IFA_FLAGS */; 3874 } 3875 3876 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa, 3877 u32 portid, u32 seq, int event, unsigned int flags) 3878 { 3879 struct nlmsghdr *nlh; 3880 u32 preferred, valid; 3881 3882 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags); 3883 if (nlh == NULL) 3884 return -EMSGSIZE; 3885 3886 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope), 3887 ifa->idev->dev->ifindex); 3888 3889 if (!((ifa->flags&IFA_F_PERMANENT) && 3890 (ifa->prefered_lft == INFINITY_LIFE_TIME))) { 3891 preferred = ifa->prefered_lft; 3892 valid = ifa->valid_lft; 3893 if (preferred != INFINITY_LIFE_TIME) { 3894 long tval = (jiffies - ifa->tstamp)/HZ; 3895 if (preferred > tval) 3896 preferred -= tval; 3897 else 3898 preferred = 0; 3899 if (valid != INFINITY_LIFE_TIME) { 3900 if (valid > tval) 3901 valid -= tval; 3902 else 3903 valid = 0; 3904 } 3905 } 3906 } else { 3907 preferred = INFINITY_LIFE_TIME; 3908 valid = INFINITY_LIFE_TIME; 3909 } 3910 3911 if (!ipv6_addr_any(&ifa->peer_addr)) { 3912 if (nla_put(skb, IFA_LOCAL, 16, &ifa->addr) < 0 || 3913 nla_put(skb, IFA_ADDRESS, 16, &ifa->peer_addr) < 0) 3914 goto error; 3915 } else 3916 if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0) 3917 goto error; 3918 3919 if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) 3920 goto error; 3921 3922 if (nla_put_u32(skb, IFA_FLAGS, ifa->flags) < 0) 3923 goto error; 3924 3925 return nlmsg_end(skb, nlh); 3926 3927 error: 3928 nlmsg_cancel(skb, nlh); 3929 return -EMSGSIZE; 3930 } 3931 3932 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca, 3933 u32 portid, u32 seq, int event, u16 flags) 3934 { 3935 struct nlmsghdr *nlh; 3936 u8 scope = RT_SCOPE_UNIVERSE; 3937 int ifindex = ifmca->idev->dev->ifindex; 3938 3939 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE) 3940 scope = RT_SCOPE_SITE; 3941 3942 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags); 3943 if (nlh == NULL) 3944 return -EMSGSIZE; 3945 3946 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 3947 if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 || 3948 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp, 3949 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 3950 nlmsg_cancel(skb, nlh); 3951 return -EMSGSIZE; 3952 } 3953 3954 return nlmsg_end(skb, nlh); 3955 } 3956 3957 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca, 3958 u32 portid, u32 seq, int event, unsigned int flags) 3959 { 3960 struct nlmsghdr *nlh; 3961 u8 scope = RT_SCOPE_UNIVERSE; 3962 int ifindex = ifaca->aca_idev->dev->ifindex; 3963 3964 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE) 3965 scope = RT_SCOPE_SITE; 3966 3967 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags); 3968 if (nlh == NULL) 3969 return -EMSGSIZE; 3970 3971 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 3972 if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 || 3973 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp, 3974 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 3975 nlmsg_cancel(skb, nlh); 3976 return -EMSGSIZE; 3977 } 3978 3979 return nlmsg_end(skb, nlh); 3980 } 3981 3982 enum addr_type_t { 3983 UNICAST_ADDR, 3984 MULTICAST_ADDR, 3985 ANYCAST_ADDR, 3986 }; 3987 3988 /* called with rcu_read_lock() */ 3989 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb, 3990 struct netlink_callback *cb, enum addr_type_t type, 3991 int s_ip_idx, int *p_ip_idx) 3992 { 3993 struct ifmcaddr6 *ifmca; 3994 struct ifacaddr6 *ifaca; 3995 int err = 1; 3996 int ip_idx = *p_ip_idx; 3997 3998 read_lock_bh(&idev->lock); 3999 switch (type) { 4000 case UNICAST_ADDR: { 4001 struct inet6_ifaddr *ifa; 4002 4003 /* unicast address incl. temp addr */ 4004 list_for_each_entry(ifa, &idev->addr_list, if_list) { 4005 if (++ip_idx < s_ip_idx) 4006 continue; 4007 err = inet6_fill_ifaddr(skb, ifa, 4008 NETLINK_CB(cb->skb).portid, 4009 cb->nlh->nlmsg_seq, 4010 RTM_NEWADDR, 4011 NLM_F_MULTI); 4012 if (err <= 0) 4013 break; 4014 nl_dump_check_consistent(cb, nlmsg_hdr(skb)); 4015 } 4016 break; 4017 } 4018 case MULTICAST_ADDR: 4019 /* multicast address */ 4020 for (ifmca = idev->mc_list; ifmca; 4021 ifmca = ifmca->next, ip_idx++) { 4022 if (ip_idx < s_ip_idx) 4023 continue; 4024 err = inet6_fill_ifmcaddr(skb, ifmca, 4025 NETLINK_CB(cb->skb).portid, 4026 cb->nlh->nlmsg_seq, 4027 RTM_GETMULTICAST, 4028 NLM_F_MULTI); 4029 if (err <= 0) 4030 break; 4031 } 4032 break; 4033 case ANYCAST_ADDR: 4034 /* anycast address */ 4035 for (ifaca = idev->ac_list; ifaca; 4036 ifaca = ifaca->aca_next, ip_idx++) { 4037 if (ip_idx < s_ip_idx) 4038 continue; 4039 err = inet6_fill_ifacaddr(skb, ifaca, 4040 NETLINK_CB(cb->skb).portid, 4041 cb->nlh->nlmsg_seq, 4042 RTM_GETANYCAST, 4043 NLM_F_MULTI); 4044 if (err <= 0) 4045 break; 4046 } 4047 break; 4048 default: 4049 break; 4050 } 4051 read_unlock_bh(&idev->lock); 4052 *p_ip_idx = ip_idx; 4053 return err; 4054 } 4055 4056 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb, 4057 enum addr_type_t type) 4058 { 4059 struct net *net = sock_net(skb->sk); 4060 int h, s_h; 4061 int idx, ip_idx; 4062 int s_idx, s_ip_idx; 4063 struct net_device *dev; 4064 struct inet6_dev *idev; 4065 struct hlist_head *head; 4066 4067 s_h = cb->args[0]; 4068 s_idx = idx = cb->args[1]; 4069 s_ip_idx = ip_idx = cb->args[2]; 4070 4071 rcu_read_lock(); 4072 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ net->dev_base_seq; 4073 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 4074 idx = 0; 4075 head = &net->dev_index_head[h]; 4076 hlist_for_each_entry_rcu(dev, head, index_hlist) { 4077 if (idx < s_idx) 4078 goto cont; 4079 if (h > s_h || idx > s_idx) 4080 s_ip_idx = 0; 4081 ip_idx = 0; 4082 idev = __in6_dev_get(dev); 4083 if (!idev) 4084 goto cont; 4085 4086 if (in6_dump_addrs(idev, skb, cb, type, 4087 s_ip_idx, &ip_idx) <= 0) 4088 goto done; 4089 cont: 4090 idx++; 4091 } 4092 } 4093 done: 4094 rcu_read_unlock(); 4095 cb->args[0] = h; 4096 cb->args[1] = idx; 4097 cb->args[2] = ip_idx; 4098 4099 return skb->len; 4100 } 4101 4102 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb) 4103 { 4104 enum addr_type_t type = UNICAST_ADDR; 4105 4106 return inet6_dump_addr(skb, cb, type); 4107 } 4108 4109 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb) 4110 { 4111 enum addr_type_t type = MULTICAST_ADDR; 4112 4113 return inet6_dump_addr(skb, cb, type); 4114 } 4115 4116 4117 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb) 4118 { 4119 enum addr_type_t type = ANYCAST_ADDR; 4120 4121 return inet6_dump_addr(skb, cb, type); 4122 } 4123 4124 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh) 4125 { 4126 struct net *net = sock_net(in_skb->sk); 4127 struct ifaddrmsg *ifm; 4128 struct nlattr *tb[IFA_MAX+1]; 4129 struct in6_addr *addr = NULL, *peer; 4130 struct net_device *dev = NULL; 4131 struct inet6_ifaddr *ifa; 4132 struct sk_buff *skb; 4133 int err; 4134 4135 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy); 4136 if (err < 0) 4137 goto errout; 4138 4139 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer); 4140 if (addr == NULL) { 4141 err = -EINVAL; 4142 goto errout; 4143 } 4144 4145 ifm = nlmsg_data(nlh); 4146 if (ifm->ifa_index) 4147 dev = __dev_get_by_index(net, ifm->ifa_index); 4148 4149 ifa = ipv6_get_ifaddr(net, addr, dev, 1); 4150 if (!ifa) { 4151 err = -EADDRNOTAVAIL; 4152 goto errout; 4153 } 4154 4155 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL); 4156 if (!skb) { 4157 err = -ENOBUFS; 4158 goto errout_ifa; 4159 } 4160 4161 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).portid, 4162 nlh->nlmsg_seq, RTM_NEWADDR, 0); 4163 if (err < 0) { 4164 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 4165 WARN_ON(err == -EMSGSIZE); 4166 kfree_skb(skb); 4167 goto errout_ifa; 4168 } 4169 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid); 4170 errout_ifa: 4171 in6_ifa_put(ifa); 4172 errout: 4173 return err; 4174 } 4175 4176 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa) 4177 { 4178 struct sk_buff *skb; 4179 struct net *net = dev_net(ifa->idev->dev); 4180 int err = -ENOBUFS; 4181 4182 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC); 4183 if (skb == NULL) 4184 goto errout; 4185 4186 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0); 4187 if (err < 0) { 4188 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 4189 WARN_ON(err == -EMSGSIZE); 4190 kfree_skb(skb); 4191 goto errout; 4192 } 4193 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC); 4194 return; 4195 errout: 4196 if (err < 0) 4197 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err); 4198 } 4199 4200 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf, 4201 __s32 *array, int bytes) 4202 { 4203 BUG_ON(bytes < (DEVCONF_MAX * 4)); 4204 4205 memset(array, 0, bytes); 4206 array[DEVCONF_FORWARDING] = cnf->forwarding; 4207 array[DEVCONF_HOPLIMIT] = cnf->hop_limit; 4208 array[DEVCONF_MTU6] = cnf->mtu6; 4209 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra; 4210 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects; 4211 array[DEVCONF_AUTOCONF] = cnf->autoconf; 4212 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits; 4213 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits; 4214 array[DEVCONF_RTR_SOLICIT_INTERVAL] = 4215 jiffies_to_msecs(cnf->rtr_solicit_interval); 4216 array[DEVCONF_RTR_SOLICIT_DELAY] = 4217 jiffies_to_msecs(cnf->rtr_solicit_delay); 4218 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version; 4219 array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] = 4220 jiffies_to_msecs(cnf->mldv1_unsolicited_report_interval); 4221 array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] = 4222 jiffies_to_msecs(cnf->mldv2_unsolicited_report_interval); 4223 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr; 4224 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft; 4225 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft; 4226 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry; 4227 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor; 4228 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses; 4229 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr; 4230 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo; 4231 #ifdef CONFIG_IPV6_ROUTER_PREF 4232 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref; 4233 array[DEVCONF_RTR_PROBE_INTERVAL] = 4234 jiffies_to_msecs(cnf->rtr_probe_interval); 4235 #ifdef CONFIG_IPV6_ROUTE_INFO 4236 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen; 4237 #endif 4238 #endif 4239 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp; 4240 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route; 4241 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 4242 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad; 4243 #endif 4244 #ifdef CONFIG_IPV6_MROUTE 4245 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding; 4246 #endif 4247 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6; 4248 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad; 4249 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao; 4250 array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify; 4251 array[DEVCONF_SUPPRESS_FRAG_NDISC] = cnf->suppress_frag_ndisc; 4252 } 4253 4254 static inline size_t inet6_ifla6_size(void) 4255 { 4256 return nla_total_size(4) /* IFLA_INET6_FLAGS */ 4257 + nla_total_size(sizeof(struct ifla_cacheinfo)) 4258 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */ 4259 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */ 4260 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */ 4261 + nla_total_size(sizeof(struct in6_addr)); /* IFLA_INET6_TOKEN */ 4262 } 4263 4264 static inline size_t inet6_if_nlmsg_size(void) 4265 { 4266 return NLMSG_ALIGN(sizeof(struct ifinfomsg)) 4267 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */ 4268 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */ 4269 + nla_total_size(4) /* IFLA_MTU */ 4270 + nla_total_size(4) /* IFLA_LINK */ 4271 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */ 4272 } 4273 4274 static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib, 4275 int items, int bytes) 4276 { 4277 int i; 4278 int pad = bytes - sizeof(u64) * items; 4279 BUG_ON(pad < 0); 4280 4281 /* Use put_unaligned() because stats may not be aligned for u64. */ 4282 put_unaligned(items, &stats[0]); 4283 for (i = 1; i < items; i++) 4284 put_unaligned(atomic_long_read(&mib[i]), &stats[i]); 4285 4286 memset(&stats[items], 0, pad); 4287 } 4288 4289 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu **mib, 4290 int items, int bytes, size_t syncpoff) 4291 { 4292 int i; 4293 int pad = bytes - sizeof(u64) * items; 4294 BUG_ON(pad < 0); 4295 4296 /* Use put_unaligned() because stats may not be aligned for u64. */ 4297 put_unaligned(items, &stats[0]); 4298 for (i = 1; i < items; i++) 4299 put_unaligned(snmp_fold_field64(mib, i, syncpoff), &stats[i]); 4300 4301 memset(&stats[items], 0, pad); 4302 } 4303 4304 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype, 4305 int bytes) 4306 { 4307 switch (attrtype) { 4308 case IFLA_INET6_STATS: 4309 __snmp6_fill_stats64(stats, (void __percpu **)idev->stats.ipv6, 4310 IPSTATS_MIB_MAX, bytes, offsetof(struct ipstats_mib, syncp)); 4311 break; 4312 case IFLA_INET6_ICMP6STATS: 4313 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, ICMP6_MIB_MAX, bytes); 4314 break; 4315 } 4316 } 4317 4318 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev) 4319 { 4320 struct nlattr *nla; 4321 struct ifla_cacheinfo ci; 4322 4323 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags)) 4324 goto nla_put_failure; 4325 ci.max_reasm_len = IPV6_MAXPLEN; 4326 ci.tstamp = cstamp_delta(idev->tstamp); 4327 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time); 4328 ci.retrans_time = jiffies_to_msecs(NEIGH_VAR(idev->nd_parms, RETRANS_TIME)); 4329 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci)) 4330 goto nla_put_failure; 4331 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32)); 4332 if (nla == NULL) 4333 goto nla_put_failure; 4334 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla)); 4335 4336 /* XXX - MC not implemented */ 4337 4338 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64)); 4339 if (nla == NULL) 4340 goto nla_put_failure; 4341 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla)); 4342 4343 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64)); 4344 if (nla == NULL) 4345 goto nla_put_failure; 4346 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla)); 4347 4348 nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr)); 4349 if (nla == NULL) 4350 goto nla_put_failure; 4351 read_lock_bh(&idev->lock); 4352 memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla)); 4353 read_unlock_bh(&idev->lock); 4354 4355 return 0; 4356 4357 nla_put_failure: 4358 return -EMSGSIZE; 4359 } 4360 4361 static size_t inet6_get_link_af_size(const struct net_device *dev) 4362 { 4363 if (!__in6_dev_get(dev)) 4364 return 0; 4365 4366 return inet6_ifla6_size(); 4367 } 4368 4369 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev) 4370 { 4371 struct inet6_dev *idev = __in6_dev_get(dev); 4372 4373 if (!idev) 4374 return -ENODATA; 4375 4376 if (inet6_fill_ifla6_attrs(skb, idev) < 0) 4377 return -EMSGSIZE; 4378 4379 return 0; 4380 } 4381 4382 static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token) 4383 { 4384 struct inet6_ifaddr *ifp; 4385 struct net_device *dev = idev->dev; 4386 bool update_rs = false; 4387 struct in6_addr ll_addr; 4388 4389 if (token == NULL) 4390 return -EINVAL; 4391 if (ipv6_addr_any(token)) 4392 return -EINVAL; 4393 if (dev->flags & (IFF_LOOPBACK | IFF_NOARP)) 4394 return -EINVAL; 4395 if (!ipv6_accept_ra(idev)) 4396 return -EINVAL; 4397 if (idev->cnf.rtr_solicits <= 0) 4398 return -EINVAL; 4399 4400 write_lock_bh(&idev->lock); 4401 4402 BUILD_BUG_ON(sizeof(token->s6_addr) != 16); 4403 memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8); 4404 4405 write_unlock_bh(&idev->lock); 4406 4407 if (!idev->dead && (idev->if_flags & IF_READY) && 4408 !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE | 4409 IFA_F_OPTIMISTIC)) { 4410 4411 /* If we're not ready, then normal ifup will take care 4412 * of this. Otherwise, we need to request our rs here. 4413 */ 4414 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters); 4415 update_rs = true; 4416 } 4417 4418 write_lock_bh(&idev->lock); 4419 4420 if (update_rs) { 4421 idev->if_flags |= IF_RS_SENT; 4422 idev->rs_probes = 1; 4423 addrconf_mod_rs_timer(idev, idev->cnf.rtr_solicit_interval); 4424 } 4425 4426 /* Well, that's kinda nasty ... */ 4427 list_for_each_entry(ifp, &idev->addr_list, if_list) { 4428 spin_lock(&ifp->lock); 4429 if (ifp->tokenized) { 4430 ifp->valid_lft = 0; 4431 ifp->prefered_lft = 0; 4432 } 4433 spin_unlock(&ifp->lock); 4434 } 4435 4436 write_unlock_bh(&idev->lock); 4437 addrconf_verify(0); 4438 return 0; 4439 } 4440 4441 static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla) 4442 { 4443 int err = -EINVAL; 4444 struct inet6_dev *idev = __in6_dev_get(dev); 4445 struct nlattr *tb[IFLA_INET6_MAX + 1]; 4446 4447 if (!idev) 4448 return -EAFNOSUPPORT; 4449 4450 if (nla_parse_nested(tb, IFLA_INET6_MAX, nla, NULL) < 0) 4451 BUG(); 4452 4453 if (tb[IFLA_INET6_TOKEN]) 4454 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN])); 4455 4456 return err; 4457 } 4458 4459 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev, 4460 u32 portid, u32 seq, int event, unsigned int flags) 4461 { 4462 struct net_device *dev = idev->dev; 4463 struct ifinfomsg *hdr; 4464 struct nlmsghdr *nlh; 4465 void *protoinfo; 4466 4467 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags); 4468 if (nlh == NULL) 4469 return -EMSGSIZE; 4470 4471 hdr = nlmsg_data(nlh); 4472 hdr->ifi_family = AF_INET6; 4473 hdr->__ifi_pad = 0; 4474 hdr->ifi_type = dev->type; 4475 hdr->ifi_index = dev->ifindex; 4476 hdr->ifi_flags = dev_get_flags(dev); 4477 hdr->ifi_change = 0; 4478 4479 if (nla_put_string(skb, IFLA_IFNAME, dev->name) || 4480 (dev->addr_len && 4481 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) || 4482 nla_put_u32(skb, IFLA_MTU, dev->mtu) || 4483 (dev->ifindex != dev->iflink && 4484 nla_put_u32(skb, IFLA_LINK, dev->iflink))) 4485 goto nla_put_failure; 4486 protoinfo = nla_nest_start(skb, IFLA_PROTINFO); 4487 if (protoinfo == NULL) 4488 goto nla_put_failure; 4489 4490 if (inet6_fill_ifla6_attrs(skb, idev) < 0) 4491 goto nla_put_failure; 4492 4493 nla_nest_end(skb, protoinfo); 4494 return nlmsg_end(skb, nlh); 4495 4496 nla_put_failure: 4497 nlmsg_cancel(skb, nlh); 4498 return -EMSGSIZE; 4499 } 4500 4501 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb) 4502 { 4503 struct net *net = sock_net(skb->sk); 4504 int h, s_h; 4505 int idx = 0, s_idx; 4506 struct net_device *dev; 4507 struct inet6_dev *idev; 4508 struct hlist_head *head; 4509 4510 s_h = cb->args[0]; 4511 s_idx = cb->args[1]; 4512 4513 rcu_read_lock(); 4514 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 4515 idx = 0; 4516 head = &net->dev_index_head[h]; 4517 hlist_for_each_entry_rcu(dev, head, index_hlist) { 4518 if (idx < s_idx) 4519 goto cont; 4520 idev = __in6_dev_get(dev); 4521 if (!idev) 4522 goto cont; 4523 if (inet6_fill_ifinfo(skb, idev, 4524 NETLINK_CB(cb->skb).portid, 4525 cb->nlh->nlmsg_seq, 4526 RTM_NEWLINK, NLM_F_MULTI) <= 0) 4527 goto out; 4528 cont: 4529 idx++; 4530 } 4531 } 4532 out: 4533 rcu_read_unlock(); 4534 cb->args[1] = idx; 4535 cb->args[0] = h; 4536 4537 return skb->len; 4538 } 4539 4540 void inet6_ifinfo_notify(int event, struct inet6_dev *idev) 4541 { 4542 struct sk_buff *skb; 4543 struct net *net = dev_net(idev->dev); 4544 int err = -ENOBUFS; 4545 4546 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC); 4547 if (skb == NULL) 4548 goto errout; 4549 4550 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0); 4551 if (err < 0) { 4552 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */ 4553 WARN_ON(err == -EMSGSIZE); 4554 kfree_skb(skb); 4555 goto errout; 4556 } 4557 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC); 4558 return; 4559 errout: 4560 if (err < 0) 4561 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err); 4562 } 4563 4564 static inline size_t inet6_prefix_nlmsg_size(void) 4565 { 4566 return NLMSG_ALIGN(sizeof(struct prefixmsg)) 4567 + nla_total_size(sizeof(struct in6_addr)) 4568 + nla_total_size(sizeof(struct prefix_cacheinfo)); 4569 } 4570 4571 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev, 4572 struct prefix_info *pinfo, u32 portid, u32 seq, 4573 int event, unsigned int flags) 4574 { 4575 struct prefixmsg *pmsg; 4576 struct nlmsghdr *nlh; 4577 struct prefix_cacheinfo ci; 4578 4579 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags); 4580 if (nlh == NULL) 4581 return -EMSGSIZE; 4582 4583 pmsg = nlmsg_data(nlh); 4584 pmsg->prefix_family = AF_INET6; 4585 pmsg->prefix_pad1 = 0; 4586 pmsg->prefix_pad2 = 0; 4587 pmsg->prefix_ifindex = idev->dev->ifindex; 4588 pmsg->prefix_len = pinfo->prefix_len; 4589 pmsg->prefix_type = pinfo->type; 4590 pmsg->prefix_pad3 = 0; 4591 pmsg->prefix_flags = 0; 4592 if (pinfo->onlink) 4593 pmsg->prefix_flags |= IF_PREFIX_ONLINK; 4594 if (pinfo->autoconf) 4595 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF; 4596 4597 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix)) 4598 goto nla_put_failure; 4599 ci.preferred_time = ntohl(pinfo->prefered); 4600 ci.valid_time = ntohl(pinfo->valid); 4601 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci)) 4602 goto nla_put_failure; 4603 return nlmsg_end(skb, nlh); 4604 4605 nla_put_failure: 4606 nlmsg_cancel(skb, nlh); 4607 return -EMSGSIZE; 4608 } 4609 4610 static void inet6_prefix_notify(int event, struct inet6_dev *idev, 4611 struct prefix_info *pinfo) 4612 { 4613 struct sk_buff *skb; 4614 struct net *net = dev_net(idev->dev); 4615 int err = -ENOBUFS; 4616 4617 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC); 4618 if (skb == NULL) 4619 goto errout; 4620 4621 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0); 4622 if (err < 0) { 4623 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */ 4624 WARN_ON(err == -EMSGSIZE); 4625 kfree_skb(skb); 4626 goto errout; 4627 } 4628 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC); 4629 return; 4630 errout: 4631 if (err < 0) 4632 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err); 4633 } 4634 4635 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 4636 { 4637 struct net *net = dev_net(ifp->idev->dev); 4638 4639 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp); 4640 4641 switch (event) { 4642 case RTM_NEWADDR: 4643 /* 4644 * If the address was optimistic 4645 * we inserted the route at the start of 4646 * our DAD process, so we don't need 4647 * to do it again 4648 */ 4649 if (!(ifp->rt->rt6i_node)) 4650 ip6_ins_rt(ifp->rt); 4651 if (ifp->idev->cnf.forwarding) 4652 addrconf_join_anycast(ifp); 4653 if (!ipv6_addr_any(&ifp->peer_addr)) 4654 addrconf_prefix_route(&ifp->peer_addr, 128, 4655 ifp->idev->dev, 0, 0); 4656 break; 4657 case RTM_DELADDR: 4658 if (ifp->idev->cnf.forwarding) 4659 addrconf_leave_anycast(ifp); 4660 addrconf_leave_solict(ifp->idev, &ifp->addr); 4661 if (!ipv6_addr_any(&ifp->peer_addr)) { 4662 struct rt6_info *rt; 4663 struct net_device *dev = ifp->idev->dev; 4664 4665 rt = rt6_lookup(dev_net(dev), &ifp->peer_addr, NULL, 4666 dev->ifindex, 1); 4667 if (rt) { 4668 dst_hold(&rt->dst); 4669 if (ip6_del_rt(rt)) 4670 dst_free(&rt->dst); 4671 } 4672 } 4673 dst_hold(&ifp->rt->dst); 4674 4675 if (ip6_del_rt(ifp->rt)) 4676 dst_free(&ifp->rt->dst); 4677 break; 4678 } 4679 atomic_inc(&net->ipv6.dev_addr_genid); 4680 rt_genid_bump_ipv6(net); 4681 } 4682 4683 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 4684 { 4685 rcu_read_lock_bh(); 4686 if (likely(ifp->idev->dead == 0)) 4687 __ipv6_ifa_notify(event, ifp); 4688 rcu_read_unlock_bh(); 4689 } 4690 4691 #ifdef CONFIG_SYSCTL 4692 4693 static 4694 int addrconf_sysctl_forward(struct ctl_table *ctl, int write, 4695 void __user *buffer, size_t *lenp, loff_t *ppos) 4696 { 4697 int *valp = ctl->data; 4698 int val = *valp; 4699 loff_t pos = *ppos; 4700 struct ctl_table lctl; 4701 int ret; 4702 4703 /* 4704 * ctl->data points to idev->cnf.forwarding, we should 4705 * not modify it until we get the rtnl lock. 4706 */ 4707 lctl = *ctl; 4708 lctl.data = &val; 4709 4710 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 4711 4712 if (write) 4713 ret = addrconf_fixup_forwarding(ctl, valp, val); 4714 if (ret) 4715 *ppos = pos; 4716 return ret; 4717 } 4718 4719 static void dev_disable_change(struct inet6_dev *idev) 4720 { 4721 struct netdev_notifier_info info; 4722 4723 if (!idev || !idev->dev) 4724 return; 4725 4726 netdev_notifier_info_init(&info, idev->dev); 4727 if (idev->cnf.disable_ipv6) 4728 addrconf_notify(NULL, NETDEV_DOWN, &info); 4729 else 4730 addrconf_notify(NULL, NETDEV_UP, &info); 4731 } 4732 4733 static void addrconf_disable_change(struct net *net, __s32 newf) 4734 { 4735 struct net_device *dev; 4736 struct inet6_dev *idev; 4737 4738 rcu_read_lock(); 4739 for_each_netdev_rcu(net, dev) { 4740 idev = __in6_dev_get(dev); 4741 if (idev) { 4742 int changed = (!idev->cnf.disable_ipv6) ^ (!newf); 4743 idev->cnf.disable_ipv6 = newf; 4744 if (changed) 4745 dev_disable_change(idev); 4746 } 4747 } 4748 rcu_read_unlock(); 4749 } 4750 4751 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf) 4752 { 4753 struct net *net; 4754 int old; 4755 4756 if (!rtnl_trylock()) 4757 return restart_syscall(); 4758 4759 net = (struct net *)table->extra2; 4760 old = *p; 4761 *p = newf; 4762 4763 if (p == &net->ipv6.devconf_dflt->disable_ipv6) { 4764 rtnl_unlock(); 4765 return 0; 4766 } 4767 4768 if (p == &net->ipv6.devconf_all->disable_ipv6) { 4769 net->ipv6.devconf_dflt->disable_ipv6 = newf; 4770 addrconf_disable_change(net, newf); 4771 } else if ((!newf) ^ (!old)) 4772 dev_disable_change((struct inet6_dev *)table->extra1); 4773 4774 rtnl_unlock(); 4775 return 0; 4776 } 4777 4778 static 4779 int addrconf_sysctl_disable(struct ctl_table *ctl, int write, 4780 void __user *buffer, size_t *lenp, loff_t *ppos) 4781 { 4782 int *valp = ctl->data; 4783 int val = *valp; 4784 loff_t pos = *ppos; 4785 struct ctl_table lctl; 4786 int ret; 4787 4788 /* 4789 * ctl->data points to idev->cnf.disable_ipv6, we should 4790 * not modify it until we get the rtnl lock. 4791 */ 4792 lctl = *ctl; 4793 lctl.data = &val; 4794 4795 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 4796 4797 if (write) 4798 ret = addrconf_disable_ipv6(ctl, valp, val); 4799 if (ret) 4800 *ppos = pos; 4801 return ret; 4802 } 4803 4804 static 4805 int addrconf_sysctl_proxy_ndp(struct ctl_table *ctl, int write, 4806 void __user *buffer, size_t *lenp, loff_t *ppos) 4807 { 4808 int *valp = ctl->data; 4809 int ret; 4810 int old, new; 4811 4812 old = *valp; 4813 ret = proc_dointvec(ctl, write, buffer, lenp, ppos); 4814 new = *valp; 4815 4816 if (write && old != new) { 4817 struct net *net = ctl->extra2; 4818 4819 if (!rtnl_trylock()) 4820 return restart_syscall(); 4821 4822 if (valp == &net->ipv6.devconf_dflt->proxy_ndp) 4823 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH, 4824 NETCONFA_IFINDEX_DEFAULT, 4825 net->ipv6.devconf_dflt); 4826 else if (valp == &net->ipv6.devconf_all->proxy_ndp) 4827 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH, 4828 NETCONFA_IFINDEX_ALL, 4829 net->ipv6.devconf_all); 4830 else { 4831 struct inet6_dev *idev = ctl->extra1; 4832 4833 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH, 4834 idev->dev->ifindex, 4835 &idev->cnf); 4836 } 4837 rtnl_unlock(); 4838 } 4839 4840 return ret; 4841 } 4842 4843 4844 static struct addrconf_sysctl_table 4845 { 4846 struct ctl_table_header *sysctl_header; 4847 struct ctl_table addrconf_vars[DEVCONF_MAX+1]; 4848 } addrconf_sysctl __read_mostly = { 4849 .sysctl_header = NULL, 4850 .addrconf_vars = { 4851 { 4852 .procname = "forwarding", 4853 .data = &ipv6_devconf.forwarding, 4854 .maxlen = sizeof(int), 4855 .mode = 0644, 4856 .proc_handler = addrconf_sysctl_forward, 4857 }, 4858 { 4859 .procname = "hop_limit", 4860 .data = &ipv6_devconf.hop_limit, 4861 .maxlen = sizeof(int), 4862 .mode = 0644, 4863 .proc_handler = proc_dointvec, 4864 }, 4865 { 4866 .procname = "mtu", 4867 .data = &ipv6_devconf.mtu6, 4868 .maxlen = sizeof(int), 4869 .mode = 0644, 4870 .proc_handler = proc_dointvec, 4871 }, 4872 { 4873 .procname = "accept_ra", 4874 .data = &ipv6_devconf.accept_ra, 4875 .maxlen = sizeof(int), 4876 .mode = 0644, 4877 .proc_handler = proc_dointvec, 4878 }, 4879 { 4880 .procname = "accept_redirects", 4881 .data = &ipv6_devconf.accept_redirects, 4882 .maxlen = sizeof(int), 4883 .mode = 0644, 4884 .proc_handler = proc_dointvec, 4885 }, 4886 { 4887 .procname = "autoconf", 4888 .data = &ipv6_devconf.autoconf, 4889 .maxlen = sizeof(int), 4890 .mode = 0644, 4891 .proc_handler = proc_dointvec, 4892 }, 4893 { 4894 .procname = "dad_transmits", 4895 .data = &ipv6_devconf.dad_transmits, 4896 .maxlen = sizeof(int), 4897 .mode = 0644, 4898 .proc_handler = proc_dointvec, 4899 }, 4900 { 4901 .procname = "router_solicitations", 4902 .data = &ipv6_devconf.rtr_solicits, 4903 .maxlen = sizeof(int), 4904 .mode = 0644, 4905 .proc_handler = proc_dointvec, 4906 }, 4907 { 4908 .procname = "router_solicitation_interval", 4909 .data = &ipv6_devconf.rtr_solicit_interval, 4910 .maxlen = sizeof(int), 4911 .mode = 0644, 4912 .proc_handler = proc_dointvec_jiffies, 4913 }, 4914 { 4915 .procname = "router_solicitation_delay", 4916 .data = &ipv6_devconf.rtr_solicit_delay, 4917 .maxlen = sizeof(int), 4918 .mode = 0644, 4919 .proc_handler = proc_dointvec_jiffies, 4920 }, 4921 { 4922 .procname = "force_mld_version", 4923 .data = &ipv6_devconf.force_mld_version, 4924 .maxlen = sizeof(int), 4925 .mode = 0644, 4926 .proc_handler = proc_dointvec, 4927 }, 4928 { 4929 .procname = "mldv1_unsolicited_report_interval", 4930 .data = 4931 &ipv6_devconf.mldv1_unsolicited_report_interval, 4932 .maxlen = sizeof(int), 4933 .mode = 0644, 4934 .proc_handler = proc_dointvec_ms_jiffies, 4935 }, 4936 { 4937 .procname = "mldv2_unsolicited_report_interval", 4938 .data = 4939 &ipv6_devconf.mldv2_unsolicited_report_interval, 4940 .maxlen = sizeof(int), 4941 .mode = 0644, 4942 .proc_handler = proc_dointvec_ms_jiffies, 4943 }, 4944 { 4945 .procname = "use_tempaddr", 4946 .data = &ipv6_devconf.use_tempaddr, 4947 .maxlen = sizeof(int), 4948 .mode = 0644, 4949 .proc_handler = proc_dointvec, 4950 }, 4951 { 4952 .procname = "temp_valid_lft", 4953 .data = &ipv6_devconf.temp_valid_lft, 4954 .maxlen = sizeof(int), 4955 .mode = 0644, 4956 .proc_handler = proc_dointvec, 4957 }, 4958 { 4959 .procname = "temp_prefered_lft", 4960 .data = &ipv6_devconf.temp_prefered_lft, 4961 .maxlen = sizeof(int), 4962 .mode = 0644, 4963 .proc_handler = proc_dointvec, 4964 }, 4965 { 4966 .procname = "regen_max_retry", 4967 .data = &ipv6_devconf.regen_max_retry, 4968 .maxlen = sizeof(int), 4969 .mode = 0644, 4970 .proc_handler = proc_dointvec, 4971 }, 4972 { 4973 .procname = "max_desync_factor", 4974 .data = &ipv6_devconf.max_desync_factor, 4975 .maxlen = sizeof(int), 4976 .mode = 0644, 4977 .proc_handler = proc_dointvec, 4978 }, 4979 { 4980 .procname = "max_addresses", 4981 .data = &ipv6_devconf.max_addresses, 4982 .maxlen = sizeof(int), 4983 .mode = 0644, 4984 .proc_handler = proc_dointvec, 4985 }, 4986 { 4987 .procname = "accept_ra_defrtr", 4988 .data = &ipv6_devconf.accept_ra_defrtr, 4989 .maxlen = sizeof(int), 4990 .mode = 0644, 4991 .proc_handler = proc_dointvec, 4992 }, 4993 { 4994 .procname = "accept_ra_pinfo", 4995 .data = &ipv6_devconf.accept_ra_pinfo, 4996 .maxlen = sizeof(int), 4997 .mode = 0644, 4998 .proc_handler = proc_dointvec, 4999 }, 5000 #ifdef CONFIG_IPV6_ROUTER_PREF 5001 { 5002 .procname = "accept_ra_rtr_pref", 5003 .data = &ipv6_devconf.accept_ra_rtr_pref, 5004 .maxlen = sizeof(int), 5005 .mode = 0644, 5006 .proc_handler = proc_dointvec, 5007 }, 5008 { 5009 .procname = "router_probe_interval", 5010 .data = &ipv6_devconf.rtr_probe_interval, 5011 .maxlen = sizeof(int), 5012 .mode = 0644, 5013 .proc_handler = proc_dointvec_jiffies, 5014 }, 5015 #ifdef CONFIG_IPV6_ROUTE_INFO 5016 { 5017 .procname = "accept_ra_rt_info_max_plen", 5018 .data = &ipv6_devconf.accept_ra_rt_info_max_plen, 5019 .maxlen = sizeof(int), 5020 .mode = 0644, 5021 .proc_handler = proc_dointvec, 5022 }, 5023 #endif 5024 #endif 5025 { 5026 .procname = "proxy_ndp", 5027 .data = &ipv6_devconf.proxy_ndp, 5028 .maxlen = sizeof(int), 5029 .mode = 0644, 5030 .proc_handler = addrconf_sysctl_proxy_ndp, 5031 }, 5032 { 5033 .procname = "accept_source_route", 5034 .data = &ipv6_devconf.accept_source_route, 5035 .maxlen = sizeof(int), 5036 .mode = 0644, 5037 .proc_handler = proc_dointvec, 5038 }, 5039 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 5040 { 5041 .procname = "optimistic_dad", 5042 .data = &ipv6_devconf.optimistic_dad, 5043 .maxlen = sizeof(int), 5044 .mode = 0644, 5045 .proc_handler = proc_dointvec, 5046 5047 }, 5048 #endif 5049 #ifdef CONFIG_IPV6_MROUTE 5050 { 5051 .procname = "mc_forwarding", 5052 .data = &ipv6_devconf.mc_forwarding, 5053 .maxlen = sizeof(int), 5054 .mode = 0444, 5055 .proc_handler = proc_dointvec, 5056 }, 5057 #endif 5058 { 5059 .procname = "disable_ipv6", 5060 .data = &ipv6_devconf.disable_ipv6, 5061 .maxlen = sizeof(int), 5062 .mode = 0644, 5063 .proc_handler = addrconf_sysctl_disable, 5064 }, 5065 { 5066 .procname = "accept_dad", 5067 .data = &ipv6_devconf.accept_dad, 5068 .maxlen = sizeof(int), 5069 .mode = 0644, 5070 .proc_handler = proc_dointvec, 5071 }, 5072 { 5073 .procname = "force_tllao", 5074 .data = &ipv6_devconf.force_tllao, 5075 .maxlen = sizeof(int), 5076 .mode = 0644, 5077 .proc_handler = proc_dointvec 5078 }, 5079 { 5080 .procname = "ndisc_notify", 5081 .data = &ipv6_devconf.ndisc_notify, 5082 .maxlen = sizeof(int), 5083 .mode = 0644, 5084 .proc_handler = proc_dointvec 5085 }, 5086 { 5087 .procname = "suppress_frag_ndisc", 5088 .data = &ipv6_devconf.suppress_frag_ndisc, 5089 .maxlen = sizeof(int), 5090 .mode = 0644, 5091 .proc_handler = proc_dointvec 5092 }, 5093 { 5094 /* sentinel */ 5095 } 5096 }, 5097 }; 5098 5099 static int __addrconf_sysctl_register(struct net *net, char *dev_name, 5100 struct inet6_dev *idev, struct ipv6_devconf *p) 5101 { 5102 int i; 5103 struct addrconf_sysctl_table *t; 5104 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ]; 5105 5106 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL); 5107 if (t == NULL) 5108 goto out; 5109 5110 for (i = 0; t->addrconf_vars[i].data; i++) { 5111 t->addrconf_vars[i].data += (char *)p - (char *)&ipv6_devconf; 5112 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */ 5113 t->addrconf_vars[i].extra2 = net; 5114 } 5115 5116 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name); 5117 5118 t->sysctl_header = register_net_sysctl(net, path, t->addrconf_vars); 5119 if (t->sysctl_header == NULL) 5120 goto free; 5121 5122 p->sysctl = t; 5123 return 0; 5124 5125 free: 5126 kfree(t); 5127 out: 5128 return -ENOBUFS; 5129 } 5130 5131 static void __addrconf_sysctl_unregister(struct ipv6_devconf *p) 5132 { 5133 struct addrconf_sysctl_table *t; 5134 5135 if (p->sysctl == NULL) 5136 return; 5137 5138 t = p->sysctl; 5139 p->sysctl = NULL; 5140 unregister_net_sysctl_table(t->sysctl_header); 5141 kfree(t); 5142 } 5143 5144 static void addrconf_sysctl_register(struct inet6_dev *idev) 5145 { 5146 neigh_sysctl_register(idev->dev, idev->nd_parms, 5147 &ndisc_ifinfo_sysctl_change); 5148 __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name, 5149 idev, &idev->cnf); 5150 } 5151 5152 static void addrconf_sysctl_unregister(struct inet6_dev *idev) 5153 { 5154 __addrconf_sysctl_unregister(&idev->cnf); 5155 neigh_sysctl_unregister(idev->nd_parms); 5156 } 5157 5158 5159 #endif 5160 5161 static int __net_init addrconf_init_net(struct net *net) 5162 { 5163 int err = -ENOMEM; 5164 struct ipv6_devconf *all, *dflt; 5165 5166 all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL); 5167 if (all == NULL) 5168 goto err_alloc_all; 5169 5170 dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL); 5171 if (dflt == NULL) 5172 goto err_alloc_dflt; 5173 5174 /* these will be inherited by all namespaces */ 5175 dflt->autoconf = ipv6_defaults.autoconf; 5176 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6; 5177 5178 net->ipv6.devconf_all = all; 5179 net->ipv6.devconf_dflt = dflt; 5180 5181 #ifdef CONFIG_SYSCTL 5182 err = __addrconf_sysctl_register(net, "all", NULL, all); 5183 if (err < 0) 5184 goto err_reg_all; 5185 5186 err = __addrconf_sysctl_register(net, "default", NULL, dflt); 5187 if (err < 0) 5188 goto err_reg_dflt; 5189 #endif 5190 return 0; 5191 5192 #ifdef CONFIG_SYSCTL 5193 err_reg_dflt: 5194 __addrconf_sysctl_unregister(all); 5195 err_reg_all: 5196 kfree(dflt); 5197 #endif 5198 err_alloc_dflt: 5199 kfree(all); 5200 err_alloc_all: 5201 return err; 5202 } 5203 5204 static void __net_exit addrconf_exit_net(struct net *net) 5205 { 5206 #ifdef CONFIG_SYSCTL 5207 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt); 5208 __addrconf_sysctl_unregister(net->ipv6.devconf_all); 5209 #endif 5210 if (!net_eq(net, &init_net)) { 5211 kfree(net->ipv6.devconf_dflt); 5212 kfree(net->ipv6.devconf_all); 5213 } 5214 } 5215 5216 static struct pernet_operations addrconf_ops = { 5217 .init = addrconf_init_net, 5218 .exit = addrconf_exit_net, 5219 }; 5220 5221 static struct rtnl_af_ops inet6_ops = { 5222 .family = AF_INET6, 5223 .fill_link_af = inet6_fill_link_af, 5224 .get_link_af_size = inet6_get_link_af_size, 5225 .set_link_af = inet6_set_link_af, 5226 }; 5227 5228 /* 5229 * Init / cleanup code 5230 */ 5231 5232 int __init addrconf_init(void) 5233 { 5234 int i, err; 5235 5236 err = ipv6_addr_label_init(); 5237 if (err < 0) { 5238 pr_crit("%s: cannot initialize default policy table: %d\n", 5239 __func__, err); 5240 goto out; 5241 } 5242 5243 err = register_pernet_subsys(&addrconf_ops); 5244 if (err < 0) 5245 goto out_addrlabel; 5246 5247 /* The addrconf netdev notifier requires that loopback_dev 5248 * has it's ipv6 private information allocated and setup 5249 * before it can bring up and give link-local addresses 5250 * to other devices which are up. 5251 * 5252 * Unfortunately, loopback_dev is not necessarily the first 5253 * entry in the global dev_base list of net devices. In fact, 5254 * it is likely to be the very last entry on that list. 5255 * So this causes the notifier registry below to try and 5256 * give link-local addresses to all devices besides loopback_dev 5257 * first, then loopback_dev, which cases all the non-loopback_dev 5258 * devices to fail to get a link-local address. 5259 * 5260 * So, as a temporary fix, allocate the ipv6 structure for 5261 * loopback_dev first by hand. 5262 * Longer term, all of the dependencies ipv6 has upon the loopback 5263 * device and it being up should be removed. 5264 */ 5265 rtnl_lock(); 5266 if (!ipv6_add_dev(init_net.loopback_dev)) 5267 err = -ENOMEM; 5268 rtnl_unlock(); 5269 if (err) 5270 goto errlo; 5271 5272 for (i = 0; i < IN6_ADDR_HSIZE; i++) 5273 INIT_HLIST_HEAD(&inet6_addr_lst[i]); 5274 5275 register_netdevice_notifier(&ipv6_dev_notf); 5276 5277 addrconf_verify(0); 5278 5279 rtnl_af_register(&inet6_ops); 5280 5281 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo, 5282 NULL); 5283 if (err < 0) 5284 goto errout; 5285 5286 /* Only the first call to __rtnl_register can fail */ 5287 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL, NULL); 5288 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL, NULL); 5289 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr, 5290 inet6_dump_ifaddr, NULL); 5291 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL, 5292 inet6_dump_ifmcaddr, NULL); 5293 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL, 5294 inet6_dump_ifacaddr, NULL); 5295 __rtnl_register(PF_INET6, RTM_GETNETCONF, inet6_netconf_get_devconf, 5296 inet6_netconf_dump_devconf, NULL); 5297 5298 ipv6_addr_label_rtnl_register(); 5299 5300 return 0; 5301 errout: 5302 rtnl_af_unregister(&inet6_ops); 5303 unregister_netdevice_notifier(&ipv6_dev_notf); 5304 errlo: 5305 unregister_pernet_subsys(&addrconf_ops); 5306 out_addrlabel: 5307 ipv6_addr_label_cleanup(); 5308 out: 5309 return err; 5310 } 5311 5312 void addrconf_cleanup(void) 5313 { 5314 struct net_device *dev; 5315 int i; 5316 5317 unregister_netdevice_notifier(&ipv6_dev_notf); 5318 unregister_pernet_subsys(&addrconf_ops); 5319 ipv6_addr_label_cleanup(); 5320 5321 rtnl_lock(); 5322 5323 __rtnl_af_unregister(&inet6_ops); 5324 5325 /* clean dev list */ 5326 for_each_netdev(&init_net, dev) { 5327 if (__in6_dev_get(dev) == NULL) 5328 continue; 5329 addrconf_ifdown(dev, 1); 5330 } 5331 addrconf_ifdown(init_net.loopback_dev, 2); 5332 5333 /* 5334 * Check hash table. 5335 */ 5336 spin_lock_bh(&addrconf_hash_lock); 5337 for (i = 0; i < IN6_ADDR_HSIZE; i++) 5338 WARN_ON(!hlist_empty(&inet6_addr_lst[i])); 5339 spin_unlock_bh(&addrconf_hash_lock); 5340 5341 del_timer(&addr_chk_timer); 5342 rtnl_unlock(); 5343 } 5344