1 /* 2 * IPv6 Address [auto]configuration 3 * Linux INET6 implementation 4 * 5 * Authors: 6 * Pedro Roque <roque@di.fc.ul.pt> 7 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru> 8 * 9 * This program is free software; you can redistribute it and/or 10 * modify it under the terms of the GNU General Public License 11 * as published by the Free Software Foundation; either version 12 * 2 of the License, or (at your option) any later version. 13 */ 14 15 /* 16 * Changes: 17 * 18 * Janos Farkas : delete timer on ifdown 19 * <chexum@bankinf.banki.hu> 20 * Andi Kleen : kill double kfree on module 21 * unload. 22 * Maciej W. Rozycki : FDDI support 23 * sekiya@USAGI : Don't send too many RS 24 * packets. 25 * yoshfuji@USAGI : Fixed interval between DAD 26 * packets. 27 * YOSHIFUJI Hideaki @USAGI : improved accuracy of 28 * address validation timer. 29 * YOSHIFUJI Hideaki @USAGI : Privacy Extensions (RFC3041) 30 * support. 31 * Yuji SEKIYA @USAGI : Don't assign a same IPv6 32 * address on a same interface. 33 * YOSHIFUJI Hideaki @USAGI : ARCnet support 34 * YOSHIFUJI Hideaki @USAGI : convert /proc/net/if_inet6 to 35 * seq_file. 36 * YOSHIFUJI Hideaki @USAGI : improved source address 37 * selection; consider scope, 38 * status etc. 39 */ 40 41 #define pr_fmt(fmt) "IPv6: " fmt 42 43 #include <linux/errno.h> 44 #include <linux/types.h> 45 #include <linux/kernel.h> 46 #include <linux/socket.h> 47 #include <linux/sockios.h> 48 #include <linux/net.h> 49 #include <linux/inet.h> 50 #include <linux/in6.h> 51 #include <linux/netdevice.h> 52 #include <linux/if_addr.h> 53 #include <linux/if_arp.h> 54 #include <linux/if_arcnet.h> 55 #include <linux/if_infiniband.h> 56 #include <linux/route.h> 57 #include <linux/inetdevice.h> 58 #include <linux/init.h> 59 #include <linux/slab.h> 60 #ifdef CONFIG_SYSCTL 61 #include <linux/sysctl.h> 62 #endif 63 #include <linux/capability.h> 64 #include <linux/delay.h> 65 #include <linux/notifier.h> 66 #include <linux/string.h> 67 #include <linux/hash.h> 68 69 #include <net/net_namespace.h> 70 #include <net/sock.h> 71 #include <net/snmp.h> 72 73 #include <net/af_ieee802154.h> 74 #include <net/firewire.h> 75 #include <net/ipv6.h> 76 #include <net/protocol.h> 77 #include <net/ndisc.h> 78 #include <net/ip6_route.h> 79 #include <net/addrconf.h> 80 #include <net/tcp.h> 81 #include <net/ip.h> 82 #include <net/netlink.h> 83 #include <net/pkt_sched.h> 84 #include <linux/if_tunnel.h> 85 #include <linux/rtnetlink.h> 86 #include <linux/netconf.h> 87 #include <linux/random.h> 88 #include <linux/uaccess.h> 89 #include <asm/unaligned.h> 90 91 #include <linux/proc_fs.h> 92 #include <linux/seq_file.h> 93 #include <linux/export.h> 94 95 /* Set to 3 to get tracing... */ 96 #define ACONF_DEBUG 2 97 98 #if ACONF_DEBUG >= 3 99 #define ADBG(fmt, ...) printk(fmt, ##__VA_ARGS__) 100 #else 101 #define ADBG(fmt, ...) do { if (0) printk(fmt, ##__VA_ARGS__); } while (0) 102 #endif 103 104 #define INFINITY_LIFE_TIME 0xFFFFFFFF 105 106 #define IPV6_MAX_STRLEN \ 107 sizeof("ffff:ffff:ffff:ffff:ffff:ffff:255.255.255.255") 108 109 static inline u32 cstamp_delta(unsigned long cstamp) 110 { 111 return (cstamp - INITIAL_JIFFIES) * 100UL / HZ; 112 } 113 114 #ifdef CONFIG_SYSCTL 115 static int addrconf_sysctl_register(struct inet6_dev *idev); 116 static void addrconf_sysctl_unregister(struct inet6_dev *idev); 117 #else 118 static inline int addrconf_sysctl_register(struct inet6_dev *idev) 119 { 120 return 0; 121 } 122 123 static inline void addrconf_sysctl_unregister(struct inet6_dev *idev) 124 { 125 } 126 #endif 127 128 static void __ipv6_regen_rndid(struct inet6_dev *idev); 129 static void __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr); 130 static void ipv6_regen_rndid(unsigned long data); 131 132 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev); 133 static int ipv6_count_addresses(struct inet6_dev *idev); 134 static int ipv6_generate_stable_address(struct in6_addr *addr, 135 u8 dad_count, 136 const struct inet6_dev *idev); 137 138 /* 139 * Configured unicast address hash table 140 */ 141 static struct hlist_head inet6_addr_lst[IN6_ADDR_HSIZE]; 142 static DEFINE_SPINLOCK(addrconf_hash_lock); 143 144 static void addrconf_verify(void); 145 static void addrconf_verify_rtnl(void); 146 static void addrconf_verify_work(struct work_struct *); 147 148 static struct workqueue_struct *addrconf_wq; 149 static DECLARE_DELAYED_WORK(addr_chk_work, addrconf_verify_work); 150 151 static void addrconf_join_anycast(struct inet6_ifaddr *ifp); 152 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp); 153 154 static void addrconf_type_change(struct net_device *dev, 155 unsigned long event); 156 static int addrconf_ifdown(struct net_device *dev, int how); 157 158 static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx, 159 int plen, 160 const struct net_device *dev, 161 u32 flags, u32 noflags); 162 163 static void addrconf_dad_start(struct inet6_ifaddr *ifp); 164 static void addrconf_dad_work(struct work_struct *w); 165 static void addrconf_dad_completed(struct inet6_ifaddr *ifp); 166 static void addrconf_dad_run(struct inet6_dev *idev); 167 static void addrconf_rs_timer(unsigned long data); 168 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa); 169 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa); 170 171 static void inet6_prefix_notify(int event, struct inet6_dev *idev, 172 struct prefix_info *pinfo); 173 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr, 174 struct net_device *dev); 175 176 static struct ipv6_devconf ipv6_devconf __read_mostly = { 177 .forwarding = 0, 178 .hop_limit = IPV6_DEFAULT_HOPLIMIT, 179 .mtu6 = IPV6_MIN_MTU, 180 .accept_ra = 1, 181 .accept_redirects = 1, 182 .autoconf = 1, 183 .force_mld_version = 0, 184 .mldv1_unsolicited_report_interval = 10 * HZ, 185 .mldv2_unsolicited_report_interval = HZ, 186 .dad_transmits = 1, 187 .rtr_solicits = MAX_RTR_SOLICITATIONS, 188 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL, 189 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY, 190 .use_tempaddr = 0, 191 .temp_valid_lft = TEMP_VALID_LIFETIME, 192 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME, 193 .regen_max_retry = REGEN_MAX_RETRY, 194 .max_desync_factor = MAX_DESYNC_FACTOR, 195 .max_addresses = IPV6_MAX_ADDRESSES, 196 .accept_ra_defrtr = 1, 197 .accept_ra_from_local = 0, 198 .accept_ra_pinfo = 1, 199 #ifdef CONFIG_IPV6_ROUTER_PREF 200 .accept_ra_rtr_pref = 1, 201 .rtr_probe_interval = 60 * HZ, 202 #ifdef CONFIG_IPV6_ROUTE_INFO 203 .accept_ra_rt_info_max_plen = 0, 204 #endif 205 #endif 206 .proxy_ndp = 0, 207 .accept_source_route = 0, /* we do not accept RH0 by default. */ 208 .disable_ipv6 = 0, 209 .accept_dad = 1, 210 .suppress_frag_ndisc = 1, 211 .accept_ra_mtu = 1, 212 .stable_secret = { 213 .initialized = false, 214 } 215 }; 216 217 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = { 218 .forwarding = 0, 219 .hop_limit = IPV6_DEFAULT_HOPLIMIT, 220 .mtu6 = IPV6_MIN_MTU, 221 .accept_ra = 1, 222 .accept_redirects = 1, 223 .autoconf = 1, 224 .force_mld_version = 0, 225 .mldv1_unsolicited_report_interval = 10 * HZ, 226 .mldv2_unsolicited_report_interval = HZ, 227 .dad_transmits = 1, 228 .rtr_solicits = MAX_RTR_SOLICITATIONS, 229 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL, 230 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY, 231 .use_tempaddr = 0, 232 .temp_valid_lft = TEMP_VALID_LIFETIME, 233 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME, 234 .regen_max_retry = REGEN_MAX_RETRY, 235 .max_desync_factor = MAX_DESYNC_FACTOR, 236 .max_addresses = IPV6_MAX_ADDRESSES, 237 .accept_ra_defrtr = 1, 238 .accept_ra_from_local = 0, 239 .accept_ra_pinfo = 1, 240 #ifdef CONFIG_IPV6_ROUTER_PREF 241 .accept_ra_rtr_pref = 1, 242 .rtr_probe_interval = 60 * HZ, 243 #ifdef CONFIG_IPV6_ROUTE_INFO 244 .accept_ra_rt_info_max_plen = 0, 245 #endif 246 #endif 247 .proxy_ndp = 0, 248 .accept_source_route = 0, /* we do not accept RH0 by default. */ 249 .disable_ipv6 = 0, 250 .accept_dad = 1, 251 .suppress_frag_ndisc = 1, 252 .accept_ra_mtu = 1, 253 .stable_secret = { 254 .initialized = false, 255 }, 256 }; 257 258 /* Check if a valid qdisc is available */ 259 static inline bool addrconf_qdisc_ok(const struct net_device *dev) 260 { 261 return !qdisc_tx_is_noop(dev); 262 } 263 264 static void addrconf_del_rs_timer(struct inet6_dev *idev) 265 { 266 if (del_timer(&idev->rs_timer)) 267 __in6_dev_put(idev); 268 } 269 270 static void addrconf_del_dad_work(struct inet6_ifaddr *ifp) 271 { 272 if (cancel_delayed_work(&ifp->dad_work)) 273 __in6_ifa_put(ifp); 274 } 275 276 static void addrconf_mod_rs_timer(struct inet6_dev *idev, 277 unsigned long when) 278 { 279 if (!timer_pending(&idev->rs_timer)) 280 in6_dev_hold(idev); 281 mod_timer(&idev->rs_timer, jiffies + when); 282 } 283 284 static void addrconf_mod_dad_work(struct inet6_ifaddr *ifp, 285 unsigned long delay) 286 { 287 if (!delayed_work_pending(&ifp->dad_work)) 288 in6_ifa_hold(ifp); 289 mod_delayed_work(addrconf_wq, &ifp->dad_work, delay); 290 } 291 292 static int snmp6_alloc_dev(struct inet6_dev *idev) 293 { 294 int i; 295 296 idev->stats.ipv6 = alloc_percpu(struct ipstats_mib); 297 if (!idev->stats.ipv6) 298 goto err_ip; 299 300 for_each_possible_cpu(i) { 301 struct ipstats_mib *addrconf_stats; 302 addrconf_stats = per_cpu_ptr(idev->stats.ipv6, i); 303 u64_stats_init(&addrconf_stats->syncp); 304 } 305 306 307 idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device), 308 GFP_KERNEL); 309 if (!idev->stats.icmpv6dev) 310 goto err_icmp; 311 idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device), 312 GFP_KERNEL); 313 if (!idev->stats.icmpv6msgdev) 314 goto err_icmpmsg; 315 316 return 0; 317 318 err_icmpmsg: 319 kfree(idev->stats.icmpv6dev); 320 err_icmp: 321 free_percpu(idev->stats.ipv6); 322 err_ip: 323 return -ENOMEM; 324 } 325 326 static struct inet6_dev *ipv6_add_dev(struct net_device *dev) 327 { 328 struct inet6_dev *ndev; 329 int err = -ENOMEM; 330 331 ASSERT_RTNL(); 332 333 if (dev->mtu < IPV6_MIN_MTU) 334 return ERR_PTR(-EINVAL); 335 336 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL); 337 if (!ndev) 338 return ERR_PTR(err); 339 340 rwlock_init(&ndev->lock); 341 ndev->dev = dev; 342 INIT_LIST_HEAD(&ndev->addr_list); 343 setup_timer(&ndev->rs_timer, addrconf_rs_timer, 344 (unsigned long)ndev); 345 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf)); 346 ndev->cnf.mtu6 = dev->mtu; 347 ndev->cnf.sysctl = NULL; 348 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl); 349 if (!ndev->nd_parms) { 350 kfree(ndev); 351 return ERR_PTR(err); 352 } 353 if (ndev->cnf.forwarding) 354 dev_disable_lro(dev); 355 /* We refer to the device */ 356 dev_hold(dev); 357 358 if (snmp6_alloc_dev(ndev) < 0) { 359 ADBG(KERN_WARNING 360 "%s: cannot allocate memory for statistics; dev=%s.\n", 361 __func__, dev->name); 362 neigh_parms_release(&nd_tbl, ndev->nd_parms); 363 dev_put(dev); 364 kfree(ndev); 365 return ERR_PTR(err); 366 } 367 368 if (snmp6_register_dev(ndev) < 0) { 369 ADBG(KERN_WARNING 370 "%s: cannot create /proc/net/dev_snmp6/%s\n", 371 __func__, dev->name); 372 goto err_release; 373 } 374 375 /* One reference from device. We must do this before 376 * we invoke __ipv6_regen_rndid(). 377 */ 378 in6_dev_hold(ndev); 379 380 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK)) 381 ndev->cnf.accept_dad = -1; 382 383 #if IS_ENABLED(CONFIG_IPV6_SIT) 384 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) { 385 pr_info("%s: Disabled Multicast RS\n", dev->name); 386 ndev->cnf.rtr_solicits = 0; 387 } 388 #endif 389 390 INIT_LIST_HEAD(&ndev->tempaddr_list); 391 setup_timer(&ndev->regen_timer, ipv6_regen_rndid, (unsigned long)ndev); 392 if ((dev->flags&IFF_LOOPBACK) || 393 dev->type == ARPHRD_TUNNEL || 394 dev->type == ARPHRD_TUNNEL6 || 395 dev->type == ARPHRD_SIT || 396 dev->type == ARPHRD_NONE) { 397 ndev->cnf.use_tempaddr = -1; 398 } else { 399 in6_dev_hold(ndev); 400 ipv6_regen_rndid((unsigned long) ndev); 401 } 402 403 ndev->token = in6addr_any; 404 405 if (netif_running(dev) && addrconf_qdisc_ok(dev)) 406 ndev->if_flags |= IF_READY; 407 408 ipv6_mc_init_dev(ndev); 409 ndev->tstamp = jiffies; 410 err = addrconf_sysctl_register(ndev); 411 if (err) { 412 ipv6_mc_destroy_dev(ndev); 413 del_timer(&ndev->regen_timer); 414 goto err_release; 415 } 416 /* protected by rtnl_lock */ 417 rcu_assign_pointer(dev->ip6_ptr, ndev); 418 419 /* Join interface-local all-node multicast group */ 420 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allnodes); 421 422 /* Join all-node multicast group */ 423 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes); 424 425 /* Join all-router multicast group if forwarding is set */ 426 if (ndev->cnf.forwarding && (dev->flags & IFF_MULTICAST)) 427 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters); 428 429 return ndev; 430 431 err_release: 432 neigh_parms_release(&nd_tbl, ndev->nd_parms); 433 ndev->dead = 1; 434 in6_dev_finish_destroy(ndev); 435 return ERR_PTR(err); 436 } 437 438 static struct inet6_dev *ipv6_find_idev(struct net_device *dev) 439 { 440 struct inet6_dev *idev; 441 442 ASSERT_RTNL(); 443 444 idev = __in6_dev_get(dev); 445 if (!idev) { 446 idev = ipv6_add_dev(dev); 447 if (IS_ERR(idev)) 448 return NULL; 449 } 450 451 if (dev->flags&IFF_UP) 452 ipv6_mc_up(idev); 453 return idev; 454 } 455 456 static int inet6_netconf_msgsize_devconf(int type) 457 { 458 int size = NLMSG_ALIGN(sizeof(struct netconfmsg)) 459 + nla_total_size(4); /* NETCONFA_IFINDEX */ 460 461 /* type -1 is used for ALL */ 462 if (type == -1 || type == NETCONFA_FORWARDING) 463 size += nla_total_size(4); 464 #ifdef CONFIG_IPV6_MROUTE 465 if (type == -1 || type == NETCONFA_MC_FORWARDING) 466 size += nla_total_size(4); 467 #endif 468 if (type == -1 || type == NETCONFA_PROXY_NEIGH) 469 size += nla_total_size(4); 470 471 return size; 472 } 473 474 static int inet6_netconf_fill_devconf(struct sk_buff *skb, int ifindex, 475 struct ipv6_devconf *devconf, u32 portid, 476 u32 seq, int event, unsigned int flags, 477 int type) 478 { 479 struct nlmsghdr *nlh; 480 struct netconfmsg *ncm; 481 482 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg), 483 flags); 484 if (!nlh) 485 return -EMSGSIZE; 486 487 ncm = nlmsg_data(nlh); 488 ncm->ncm_family = AF_INET6; 489 490 if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0) 491 goto nla_put_failure; 492 493 /* type -1 is used for ALL */ 494 if ((type == -1 || type == NETCONFA_FORWARDING) && 495 nla_put_s32(skb, NETCONFA_FORWARDING, devconf->forwarding) < 0) 496 goto nla_put_failure; 497 #ifdef CONFIG_IPV6_MROUTE 498 if ((type == -1 || type == NETCONFA_MC_FORWARDING) && 499 nla_put_s32(skb, NETCONFA_MC_FORWARDING, 500 devconf->mc_forwarding) < 0) 501 goto nla_put_failure; 502 #endif 503 if ((type == -1 || type == NETCONFA_PROXY_NEIGH) && 504 nla_put_s32(skb, NETCONFA_PROXY_NEIGH, devconf->proxy_ndp) < 0) 505 goto nla_put_failure; 506 507 nlmsg_end(skb, nlh); 508 return 0; 509 510 nla_put_failure: 511 nlmsg_cancel(skb, nlh); 512 return -EMSGSIZE; 513 } 514 515 void inet6_netconf_notify_devconf(struct net *net, int type, int ifindex, 516 struct ipv6_devconf *devconf) 517 { 518 struct sk_buff *skb; 519 int err = -ENOBUFS; 520 521 skb = nlmsg_new(inet6_netconf_msgsize_devconf(type), GFP_ATOMIC); 522 if (!skb) 523 goto errout; 524 525 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 0, 0, 526 RTM_NEWNETCONF, 0, type); 527 if (err < 0) { 528 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */ 529 WARN_ON(err == -EMSGSIZE); 530 kfree_skb(skb); 531 goto errout; 532 } 533 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_NETCONF, NULL, GFP_ATOMIC); 534 return; 535 errout: 536 rtnl_set_sk_err(net, RTNLGRP_IPV6_NETCONF, err); 537 } 538 539 static const struct nla_policy devconf_ipv6_policy[NETCONFA_MAX+1] = { 540 [NETCONFA_IFINDEX] = { .len = sizeof(int) }, 541 [NETCONFA_FORWARDING] = { .len = sizeof(int) }, 542 [NETCONFA_PROXY_NEIGH] = { .len = sizeof(int) }, 543 }; 544 545 static int inet6_netconf_get_devconf(struct sk_buff *in_skb, 546 struct nlmsghdr *nlh) 547 { 548 struct net *net = sock_net(in_skb->sk); 549 struct nlattr *tb[NETCONFA_MAX+1]; 550 struct netconfmsg *ncm; 551 struct sk_buff *skb; 552 struct ipv6_devconf *devconf; 553 struct inet6_dev *in6_dev; 554 struct net_device *dev; 555 int ifindex; 556 int err; 557 558 err = nlmsg_parse(nlh, sizeof(*ncm), tb, NETCONFA_MAX, 559 devconf_ipv6_policy); 560 if (err < 0) 561 goto errout; 562 563 err = EINVAL; 564 if (!tb[NETCONFA_IFINDEX]) 565 goto errout; 566 567 ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]); 568 switch (ifindex) { 569 case NETCONFA_IFINDEX_ALL: 570 devconf = net->ipv6.devconf_all; 571 break; 572 case NETCONFA_IFINDEX_DEFAULT: 573 devconf = net->ipv6.devconf_dflt; 574 break; 575 default: 576 dev = __dev_get_by_index(net, ifindex); 577 if (!dev) 578 goto errout; 579 in6_dev = __in6_dev_get(dev); 580 if (!in6_dev) 581 goto errout; 582 devconf = &in6_dev->cnf; 583 break; 584 } 585 586 err = -ENOBUFS; 587 skb = nlmsg_new(inet6_netconf_msgsize_devconf(-1), GFP_ATOMIC); 588 if (!skb) 589 goto errout; 590 591 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 592 NETLINK_CB(in_skb).portid, 593 nlh->nlmsg_seq, RTM_NEWNETCONF, 0, 594 -1); 595 if (err < 0) { 596 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */ 597 WARN_ON(err == -EMSGSIZE); 598 kfree_skb(skb); 599 goto errout; 600 } 601 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid); 602 errout: 603 return err; 604 } 605 606 static int inet6_netconf_dump_devconf(struct sk_buff *skb, 607 struct netlink_callback *cb) 608 { 609 struct net *net = sock_net(skb->sk); 610 int h, s_h; 611 int idx, s_idx; 612 struct net_device *dev; 613 struct inet6_dev *idev; 614 struct hlist_head *head; 615 616 s_h = cb->args[0]; 617 s_idx = idx = cb->args[1]; 618 619 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 620 idx = 0; 621 head = &net->dev_index_head[h]; 622 rcu_read_lock(); 623 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ 624 net->dev_base_seq; 625 hlist_for_each_entry_rcu(dev, head, index_hlist) { 626 if (idx < s_idx) 627 goto cont; 628 idev = __in6_dev_get(dev); 629 if (!idev) 630 goto cont; 631 632 if (inet6_netconf_fill_devconf(skb, dev->ifindex, 633 &idev->cnf, 634 NETLINK_CB(cb->skb).portid, 635 cb->nlh->nlmsg_seq, 636 RTM_NEWNETCONF, 637 NLM_F_MULTI, 638 -1) < 0) { 639 rcu_read_unlock(); 640 goto done; 641 } 642 nl_dump_check_consistent(cb, nlmsg_hdr(skb)); 643 cont: 644 idx++; 645 } 646 rcu_read_unlock(); 647 } 648 if (h == NETDEV_HASHENTRIES) { 649 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL, 650 net->ipv6.devconf_all, 651 NETLINK_CB(cb->skb).portid, 652 cb->nlh->nlmsg_seq, 653 RTM_NEWNETCONF, NLM_F_MULTI, 654 -1) < 0) 655 goto done; 656 else 657 h++; 658 } 659 if (h == NETDEV_HASHENTRIES + 1) { 660 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT, 661 net->ipv6.devconf_dflt, 662 NETLINK_CB(cb->skb).portid, 663 cb->nlh->nlmsg_seq, 664 RTM_NEWNETCONF, NLM_F_MULTI, 665 -1) < 0) 666 goto done; 667 else 668 h++; 669 } 670 done: 671 cb->args[0] = h; 672 cb->args[1] = idx; 673 674 return skb->len; 675 } 676 677 #ifdef CONFIG_SYSCTL 678 static void dev_forward_change(struct inet6_dev *idev) 679 { 680 struct net_device *dev; 681 struct inet6_ifaddr *ifa; 682 683 if (!idev) 684 return; 685 dev = idev->dev; 686 if (idev->cnf.forwarding) 687 dev_disable_lro(dev); 688 if (dev->flags & IFF_MULTICAST) { 689 if (idev->cnf.forwarding) { 690 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters); 691 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allrouters); 692 ipv6_dev_mc_inc(dev, &in6addr_sitelocal_allrouters); 693 } else { 694 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters); 695 ipv6_dev_mc_dec(dev, &in6addr_interfacelocal_allrouters); 696 ipv6_dev_mc_dec(dev, &in6addr_sitelocal_allrouters); 697 } 698 } 699 700 list_for_each_entry(ifa, &idev->addr_list, if_list) { 701 if (ifa->flags&IFA_F_TENTATIVE) 702 continue; 703 if (idev->cnf.forwarding) 704 addrconf_join_anycast(ifa); 705 else 706 addrconf_leave_anycast(ifa); 707 } 708 inet6_netconf_notify_devconf(dev_net(dev), NETCONFA_FORWARDING, 709 dev->ifindex, &idev->cnf); 710 } 711 712 713 static void addrconf_forward_change(struct net *net, __s32 newf) 714 { 715 struct net_device *dev; 716 struct inet6_dev *idev; 717 718 for_each_netdev(net, dev) { 719 idev = __in6_dev_get(dev); 720 if (idev) { 721 int changed = (!idev->cnf.forwarding) ^ (!newf); 722 idev->cnf.forwarding = newf; 723 if (changed) 724 dev_forward_change(idev); 725 } 726 } 727 } 728 729 static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf) 730 { 731 struct net *net; 732 int old; 733 734 if (!rtnl_trylock()) 735 return restart_syscall(); 736 737 net = (struct net *)table->extra2; 738 old = *p; 739 *p = newf; 740 741 if (p == &net->ipv6.devconf_dflt->forwarding) { 742 if ((!newf) ^ (!old)) 743 inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING, 744 NETCONFA_IFINDEX_DEFAULT, 745 net->ipv6.devconf_dflt); 746 rtnl_unlock(); 747 return 0; 748 } 749 750 if (p == &net->ipv6.devconf_all->forwarding) { 751 net->ipv6.devconf_dflt->forwarding = newf; 752 addrconf_forward_change(net, newf); 753 if ((!newf) ^ (!old)) 754 inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING, 755 NETCONFA_IFINDEX_ALL, 756 net->ipv6.devconf_all); 757 } else if ((!newf) ^ (!old)) 758 dev_forward_change((struct inet6_dev *)table->extra1); 759 rtnl_unlock(); 760 761 if (newf) 762 rt6_purge_dflt_routers(net); 763 return 1; 764 } 765 #endif 766 767 /* Nobody refers to this ifaddr, destroy it */ 768 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp) 769 { 770 WARN_ON(!hlist_unhashed(&ifp->addr_lst)); 771 772 #ifdef NET_REFCNT_DEBUG 773 pr_debug("%s\n", __func__); 774 #endif 775 776 in6_dev_put(ifp->idev); 777 778 if (cancel_delayed_work(&ifp->dad_work)) 779 pr_notice("delayed DAD work was pending while freeing ifa=%p\n", 780 ifp); 781 782 if (ifp->state != INET6_IFADDR_STATE_DEAD) { 783 pr_warn("Freeing alive inet6 address %p\n", ifp); 784 return; 785 } 786 ip6_rt_put(ifp->rt); 787 788 kfree_rcu(ifp, rcu); 789 } 790 791 static void 792 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp) 793 { 794 struct list_head *p; 795 int ifp_scope = ipv6_addr_src_scope(&ifp->addr); 796 797 /* 798 * Each device address list is sorted in order of scope - 799 * global before linklocal. 800 */ 801 list_for_each(p, &idev->addr_list) { 802 struct inet6_ifaddr *ifa 803 = list_entry(p, struct inet6_ifaddr, if_list); 804 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr)) 805 break; 806 } 807 808 list_add_tail(&ifp->if_list, p); 809 } 810 811 static u32 inet6_addr_hash(const struct in6_addr *addr) 812 { 813 return hash_32(ipv6_addr_hash(addr), IN6_ADDR_HSIZE_SHIFT); 814 } 815 816 /* On success it returns ifp with increased reference count */ 817 818 static struct inet6_ifaddr * 819 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, 820 const struct in6_addr *peer_addr, int pfxlen, 821 int scope, u32 flags, u32 valid_lft, u32 prefered_lft) 822 { 823 struct inet6_ifaddr *ifa = NULL; 824 struct rt6_info *rt; 825 unsigned int hash; 826 int err = 0; 827 int addr_type = ipv6_addr_type(addr); 828 829 if (addr_type == IPV6_ADDR_ANY || 830 addr_type & IPV6_ADDR_MULTICAST || 831 (!(idev->dev->flags & IFF_LOOPBACK) && 832 addr_type & IPV6_ADDR_LOOPBACK)) 833 return ERR_PTR(-EADDRNOTAVAIL); 834 835 rcu_read_lock_bh(); 836 if (idev->dead) { 837 err = -ENODEV; /*XXX*/ 838 goto out2; 839 } 840 841 if (idev->cnf.disable_ipv6) { 842 err = -EACCES; 843 goto out2; 844 } 845 846 spin_lock(&addrconf_hash_lock); 847 848 /* Ignore adding duplicate addresses on an interface */ 849 if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) { 850 ADBG("ipv6_add_addr: already assigned\n"); 851 err = -EEXIST; 852 goto out; 853 } 854 855 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC); 856 857 if (!ifa) { 858 ADBG("ipv6_add_addr: malloc failed\n"); 859 err = -ENOBUFS; 860 goto out; 861 } 862 863 rt = addrconf_dst_alloc(idev, addr, false); 864 if (IS_ERR(rt)) { 865 err = PTR_ERR(rt); 866 goto out; 867 } 868 869 neigh_parms_data_state_setall(idev->nd_parms); 870 871 ifa->addr = *addr; 872 if (peer_addr) 873 ifa->peer_addr = *peer_addr; 874 875 spin_lock_init(&ifa->lock); 876 INIT_DELAYED_WORK(&ifa->dad_work, addrconf_dad_work); 877 INIT_HLIST_NODE(&ifa->addr_lst); 878 ifa->scope = scope; 879 ifa->prefix_len = pfxlen; 880 ifa->flags = flags | IFA_F_TENTATIVE; 881 ifa->valid_lft = valid_lft; 882 ifa->prefered_lft = prefered_lft; 883 ifa->cstamp = ifa->tstamp = jiffies; 884 ifa->tokenized = false; 885 886 ifa->rt = rt; 887 888 ifa->idev = idev; 889 in6_dev_hold(idev); 890 /* For caller */ 891 in6_ifa_hold(ifa); 892 893 /* Add to big hash table */ 894 hash = inet6_addr_hash(addr); 895 896 hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]); 897 spin_unlock(&addrconf_hash_lock); 898 899 write_lock(&idev->lock); 900 /* Add to inet6_dev unicast addr list. */ 901 ipv6_link_dev_addr(idev, ifa); 902 903 if (ifa->flags&IFA_F_TEMPORARY) { 904 list_add(&ifa->tmp_list, &idev->tempaddr_list); 905 in6_ifa_hold(ifa); 906 } 907 908 in6_ifa_hold(ifa); 909 write_unlock(&idev->lock); 910 out2: 911 rcu_read_unlock_bh(); 912 913 if (likely(err == 0)) 914 inet6addr_notifier_call_chain(NETDEV_UP, ifa); 915 else { 916 kfree(ifa); 917 ifa = ERR_PTR(err); 918 } 919 920 return ifa; 921 out: 922 spin_unlock(&addrconf_hash_lock); 923 goto out2; 924 } 925 926 enum cleanup_prefix_rt_t { 927 CLEANUP_PREFIX_RT_NOP, /* no cleanup action for prefix route */ 928 CLEANUP_PREFIX_RT_DEL, /* delete the prefix route */ 929 CLEANUP_PREFIX_RT_EXPIRE, /* update the lifetime of the prefix route */ 930 }; 931 932 /* 933 * Check, whether the prefix for ifp would still need a prefix route 934 * after deleting ifp. The function returns one of the CLEANUP_PREFIX_RT_* 935 * constants. 936 * 937 * 1) we don't purge prefix if address was not permanent. 938 * prefix is managed by its own lifetime. 939 * 2) we also don't purge, if the address was IFA_F_NOPREFIXROUTE. 940 * 3) if there are no addresses, delete prefix. 941 * 4) if there are still other permanent address(es), 942 * corresponding prefix is still permanent. 943 * 5) if there are still other addresses with IFA_F_NOPREFIXROUTE, 944 * don't purge the prefix, assume user space is managing it. 945 * 6) otherwise, update prefix lifetime to the 946 * longest valid lifetime among the corresponding 947 * addresses on the device. 948 * Note: subsequent RA will update lifetime. 949 **/ 950 static enum cleanup_prefix_rt_t 951 check_cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long *expires) 952 { 953 struct inet6_ifaddr *ifa; 954 struct inet6_dev *idev = ifp->idev; 955 unsigned long lifetime; 956 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_DEL; 957 958 *expires = jiffies; 959 960 list_for_each_entry(ifa, &idev->addr_list, if_list) { 961 if (ifa == ifp) 962 continue; 963 if (!ipv6_prefix_equal(&ifa->addr, &ifp->addr, 964 ifp->prefix_len)) 965 continue; 966 if (ifa->flags & (IFA_F_PERMANENT | IFA_F_NOPREFIXROUTE)) 967 return CLEANUP_PREFIX_RT_NOP; 968 969 action = CLEANUP_PREFIX_RT_EXPIRE; 970 971 spin_lock(&ifa->lock); 972 973 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ); 974 /* 975 * Note: Because this address is 976 * not permanent, lifetime < 977 * LONG_MAX / HZ here. 978 */ 979 if (time_before(*expires, ifa->tstamp + lifetime * HZ)) 980 *expires = ifa->tstamp + lifetime * HZ; 981 spin_unlock(&ifa->lock); 982 } 983 984 return action; 985 } 986 987 static void 988 cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long expires, bool del_rt) 989 { 990 struct rt6_info *rt; 991 992 rt = addrconf_get_prefix_route(&ifp->addr, 993 ifp->prefix_len, 994 ifp->idev->dev, 995 0, RTF_GATEWAY | RTF_DEFAULT); 996 if (rt) { 997 if (del_rt) 998 ip6_del_rt(rt); 999 else { 1000 if (!(rt->rt6i_flags & RTF_EXPIRES)) 1001 rt6_set_expires(rt, expires); 1002 ip6_rt_put(rt); 1003 } 1004 } 1005 } 1006 1007 1008 /* This function wants to get referenced ifp and releases it before return */ 1009 1010 static void ipv6_del_addr(struct inet6_ifaddr *ifp) 1011 { 1012 int state; 1013 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_NOP; 1014 unsigned long expires; 1015 1016 ASSERT_RTNL(); 1017 1018 spin_lock_bh(&ifp->lock); 1019 state = ifp->state; 1020 ifp->state = INET6_IFADDR_STATE_DEAD; 1021 spin_unlock_bh(&ifp->lock); 1022 1023 if (state == INET6_IFADDR_STATE_DEAD) 1024 goto out; 1025 1026 spin_lock_bh(&addrconf_hash_lock); 1027 hlist_del_init_rcu(&ifp->addr_lst); 1028 spin_unlock_bh(&addrconf_hash_lock); 1029 1030 write_lock_bh(&ifp->idev->lock); 1031 1032 if (ifp->flags&IFA_F_TEMPORARY) { 1033 list_del(&ifp->tmp_list); 1034 if (ifp->ifpub) { 1035 in6_ifa_put(ifp->ifpub); 1036 ifp->ifpub = NULL; 1037 } 1038 __in6_ifa_put(ifp); 1039 } 1040 1041 if (ifp->flags & IFA_F_PERMANENT && !(ifp->flags & IFA_F_NOPREFIXROUTE)) 1042 action = check_cleanup_prefix_route(ifp, &expires); 1043 1044 list_del_init(&ifp->if_list); 1045 __in6_ifa_put(ifp); 1046 1047 write_unlock_bh(&ifp->idev->lock); 1048 1049 addrconf_del_dad_work(ifp); 1050 1051 ipv6_ifa_notify(RTM_DELADDR, ifp); 1052 1053 inet6addr_notifier_call_chain(NETDEV_DOWN, ifp); 1054 1055 if (action != CLEANUP_PREFIX_RT_NOP) { 1056 cleanup_prefix_route(ifp, expires, 1057 action == CLEANUP_PREFIX_RT_DEL); 1058 } 1059 1060 /* clean up prefsrc entries */ 1061 rt6_remove_prefsrc(ifp); 1062 out: 1063 in6_ifa_put(ifp); 1064 } 1065 1066 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift) 1067 { 1068 struct inet6_dev *idev = ifp->idev; 1069 struct in6_addr addr, *tmpaddr; 1070 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_tstamp, age; 1071 unsigned long regen_advance; 1072 int tmp_plen; 1073 int ret = 0; 1074 u32 addr_flags; 1075 unsigned long now = jiffies; 1076 1077 write_lock_bh(&idev->lock); 1078 if (ift) { 1079 spin_lock_bh(&ift->lock); 1080 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8); 1081 spin_unlock_bh(&ift->lock); 1082 tmpaddr = &addr; 1083 } else { 1084 tmpaddr = NULL; 1085 } 1086 retry: 1087 in6_dev_hold(idev); 1088 if (idev->cnf.use_tempaddr <= 0) { 1089 write_unlock_bh(&idev->lock); 1090 pr_info("%s: use_tempaddr is disabled\n", __func__); 1091 in6_dev_put(idev); 1092 ret = -1; 1093 goto out; 1094 } 1095 spin_lock_bh(&ifp->lock); 1096 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) { 1097 idev->cnf.use_tempaddr = -1; /*XXX*/ 1098 spin_unlock_bh(&ifp->lock); 1099 write_unlock_bh(&idev->lock); 1100 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n", 1101 __func__); 1102 in6_dev_put(idev); 1103 ret = -1; 1104 goto out; 1105 } 1106 in6_ifa_hold(ifp); 1107 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8); 1108 __ipv6_try_regen_rndid(idev, tmpaddr); 1109 memcpy(&addr.s6_addr[8], idev->rndid, 8); 1110 age = (now - ifp->tstamp) / HZ; 1111 tmp_valid_lft = min_t(__u32, 1112 ifp->valid_lft, 1113 idev->cnf.temp_valid_lft + age); 1114 tmp_prefered_lft = min_t(__u32, 1115 ifp->prefered_lft, 1116 idev->cnf.temp_prefered_lft + age - 1117 idev->cnf.max_desync_factor); 1118 tmp_plen = ifp->prefix_len; 1119 tmp_tstamp = ifp->tstamp; 1120 spin_unlock_bh(&ifp->lock); 1121 1122 regen_advance = idev->cnf.regen_max_retry * 1123 idev->cnf.dad_transmits * 1124 NEIGH_VAR(idev->nd_parms, RETRANS_TIME) / HZ; 1125 write_unlock_bh(&idev->lock); 1126 1127 /* A temporary address is created only if this calculated Preferred 1128 * Lifetime is greater than REGEN_ADVANCE time units. In particular, 1129 * an implementation must not create a temporary address with a zero 1130 * Preferred Lifetime. 1131 * Use age calculation as in addrconf_verify to avoid unnecessary 1132 * temporary addresses being generated. 1133 */ 1134 age = (now - tmp_tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ; 1135 if (tmp_prefered_lft <= regen_advance + age) { 1136 in6_ifa_put(ifp); 1137 in6_dev_put(idev); 1138 ret = -1; 1139 goto out; 1140 } 1141 1142 addr_flags = IFA_F_TEMPORARY; 1143 /* set in addrconf_prefix_rcv() */ 1144 if (ifp->flags & IFA_F_OPTIMISTIC) 1145 addr_flags |= IFA_F_OPTIMISTIC; 1146 1147 ift = ipv6_add_addr(idev, &addr, NULL, tmp_plen, 1148 ipv6_addr_scope(&addr), addr_flags, 1149 tmp_valid_lft, tmp_prefered_lft); 1150 if (IS_ERR(ift)) { 1151 in6_ifa_put(ifp); 1152 in6_dev_put(idev); 1153 pr_info("%s: retry temporary address regeneration\n", __func__); 1154 tmpaddr = &addr; 1155 write_lock_bh(&idev->lock); 1156 goto retry; 1157 } 1158 1159 spin_lock_bh(&ift->lock); 1160 ift->ifpub = ifp; 1161 ift->cstamp = now; 1162 ift->tstamp = tmp_tstamp; 1163 spin_unlock_bh(&ift->lock); 1164 1165 addrconf_dad_start(ift); 1166 in6_ifa_put(ift); 1167 in6_dev_put(idev); 1168 out: 1169 return ret; 1170 } 1171 1172 /* 1173 * Choose an appropriate source address (RFC3484) 1174 */ 1175 enum { 1176 IPV6_SADDR_RULE_INIT = 0, 1177 IPV6_SADDR_RULE_LOCAL, 1178 IPV6_SADDR_RULE_SCOPE, 1179 IPV6_SADDR_RULE_PREFERRED, 1180 #ifdef CONFIG_IPV6_MIP6 1181 IPV6_SADDR_RULE_HOA, 1182 #endif 1183 IPV6_SADDR_RULE_OIF, 1184 IPV6_SADDR_RULE_LABEL, 1185 IPV6_SADDR_RULE_PRIVACY, 1186 IPV6_SADDR_RULE_ORCHID, 1187 IPV6_SADDR_RULE_PREFIX, 1188 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1189 IPV6_SADDR_RULE_NOT_OPTIMISTIC, 1190 #endif 1191 IPV6_SADDR_RULE_MAX 1192 }; 1193 1194 struct ipv6_saddr_score { 1195 int rule; 1196 int addr_type; 1197 struct inet6_ifaddr *ifa; 1198 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX); 1199 int scopedist; 1200 int matchlen; 1201 }; 1202 1203 struct ipv6_saddr_dst { 1204 const struct in6_addr *addr; 1205 int ifindex; 1206 int scope; 1207 int label; 1208 unsigned int prefs; 1209 }; 1210 1211 static inline int ipv6_saddr_preferred(int type) 1212 { 1213 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK)) 1214 return 1; 1215 return 0; 1216 } 1217 1218 static inline bool ipv6_use_optimistic_addr(struct inet6_dev *idev) 1219 { 1220 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1221 return idev && idev->cnf.optimistic_dad && idev->cnf.use_optimistic; 1222 #else 1223 return false; 1224 #endif 1225 } 1226 1227 static int ipv6_get_saddr_eval(struct net *net, 1228 struct ipv6_saddr_score *score, 1229 struct ipv6_saddr_dst *dst, 1230 int i) 1231 { 1232 int ret; 1233 1234 if (i <= score->rule) { 1235 switch (i) { 1236 case IPV6_SADDR_RULE_SCOPE: 1237 ret = score->scopedist; 1238 break; 1239 case IPV6_SADDR_RULE_PREFIX: 1240 ret = score->matchlen; 1241 break; 1242 default: 1243 ret = !!test_bit(i, score->scorebits); 1244 } 1245 goto out; 1246 } 1247 1248 switch (i) { 1249 case IPV6_SADDR_RULE_INIT: 1250 /* Rule 0: remember if hiscore is not ready yet */ 1251 ret = !!score->ifa; 1252 break; 1253 case IPV6_SADDR_RULE_LOCAL: 1254 /* Rule 1: Prefer same address */ 1255 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr); 1256 break; 1257 case IPV6_SADDR_RULE_SCOPE: 1258 /* Rule 2: Prefer appropriate scope 1259 * 1260 * ret 1261 * ^ 1262 * -1 | d 15 1263 * ---+--+-+---> scope 1264 * | 1265 * | d is scope of the destination. 1266 * B-d | \ 1267 * | \ <- smaller scope is better if 1268 * B-15 | \ if scope is enough for destination. 1269 * | ret = B - scope (-1 <= scope >= d <= 15). 1270 * d-C-1 | / 1271 * |/ <- greater is better 1272 * -C / if scope is not enough for destination. 1273 * /| ret = scope - C (-1 <= d < scope <= 15). 1274 * 1275 * d - C - 1 < B -15 (for all -1 <= d <= 15). 1276 * C > d + 14 - B >= 15 + 14 - B = 29 - B. 1277 * Assume B = 0 and we get C > 29. 1278 */ 1279 ret = __ipv6_addr_src_scope(score->addr_type); 1280 if (ret >= dst->scope) 1281 ret = -ret; 1282 else 1283 ret -= 128; /* 30 is enough */ 1284 score->scopedist = ret; 1285 break; 1286 case IPV6_SADDR_RULE_PREFERRED: 1287 { 1288 /* Rule 3: Avoid deprecated and optimistic addresses */ 1289 u8 avoid = IFA_F_DEPRECATED; 1290 1291 if (!ipv6_use_optimistic_addr(score->ifa->idev)) 1292 avoid |= IFA_F_OPTIMISTIC; 1293 ret = ipv6_saddr_preferred(score->addr_type) || 1294 !(score->ifa->flags & avoid); 1295 break; 1296 } 1297 #ifdef CONFIG_IPV6_MIP6 1298 case IPV6_SADDR_RULE_HOA: 1299 { 1300 /* Rule 4: Prefer home address */ 1301 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA); 1302 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome; 1303 break; 1304 } 1305 #endif 1306 case IPV6_SADDR_RULE_OIF: 1307 /* Rule 5: Prefer outgoing interface */ 1308 ret = (!dst->ifindex || 1309 dst->ifindex == score->ifa->idev->dev->ifindex); 1310 break; 1311 case IPV6_SADDR_RULE_LABEL: 1312 /* Rule 6: Prefer matching label */ 1313 ret = ipv6_addr_label(net, 1314 &score->ifa->addr, score->addr_type, 1315 score->ifa->idev->dev->ifindex) == dst->label; 1316 break; 1317 case IPV6_SADDR_RULE_PRIVACY: 1318 { 1319 /* Rule 7: Prefer public address 1320 * Note: prefer temporary address if use_tempaddr >= 2 1321 */ 1322 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ? 1323 !!(dst->prefs & IPV6_PREFER_SRC_TMP) : 1324 score->ifa->idev->cnf.use_tempaddr >= 2; 1325 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp; 1326 break; 1327 } 1328 case IPV6_SADDR_RULE_ORCHID: 1329 /* Rule 8-: Prefer ORCHID vs ORCHID or 1330 * non-ORCHID vs non-ORCHID 1331 */ 1332 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^ 1333 ipv6_addr_orchid(dst->addr)); 1334 break; 1335 case IPV6_SADDR_RULE_PREFIX: 1336 /* Rule 8: Use longest matching prefix */ 1337 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr); 1338 if (ret > score->ifa->prefix_len) 1339 ret = score->ifa->prefix_len; 1340 score->matchlen = ret; 1341 break; 1342 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1343 case IPV6_SADDR_RULE_NOT_OPTIMISTIC: 1344 /* Optimistic addresses still have lower precedence than other 1345 * preferred addresses. 1346 */ 1347 ret = !(score->ifa->flags & IFA_F_OPTIMISTIC); 1348 break; 1349 #endif 1350 default: 1351 ret = 0; 1352 } 1353 1354 if (ret) 1355 __set_bit(i, score->scorebits); 1356 score->rule = i; 1357 out: 1358 return ret; 1359 } 1360 1361 int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev, 1362 const struct in6_addr *daddr, unsigned int prefs, 1363 struct in6_addr *saddr) 1364 { 1365 struct ipv6_saddr_score scores[2], 1366 *score = &scores[0], *hiscore = &scores[1]; 1367 struct ipv6_saddr_dst dst; 1368 struct net_device *dev; 1369 int dst_type; 1370 1371 dst_type = __ipv6_addr_type(daddr); 1372 dst.addr = daddr; 1373 dst.ifindex = dst_dev ? dst_dev->ifindex : 0; 1374 dst.scope = __ipv6_addr_src_scope(dst_type); 1375 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex); 1376 dst.prefs = prefs; 1377 1378 hiscore->rule = -1; 1379 hiscore->ifa = NULL; 1380 1381 rcu_read_lock(); 1382 1383 for_each_netdev_rcu(net, dev) { 1384 struct inet6_dev *idev; 1385 1386 /* Candidate Source Address (section 4) 1387 * - multicast and link-local destination address, 1388 * the set of candidate source address MUST only 1389 * include addresses assigned to interfaces 1390 * belonging to the same link as the outgoing 1391 * interface. 1392 * (- For site-local destination addresses, the 1393 * set of candidate source addresses MUST only 1394 * include addresses assigned to interfaces 1395 * belonging to the same site as the outgoing 1396 * interface.) 1397 */ 1398 if (((dst_type & IPV6_ADDR_MULTICAST) || 1399 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL) && 1400 dst.ifindex && dev->ifindex != dst.ifindex) 1401 continue; 1402 1403 idev = __in6_dev_get(dev); 1404 if (!idev) 1405 continue; 1406 1407 read_lock_bh(&idev->lock); 1408 list_for_each_entry(score->ifa, &idev->addr_list, if_list) { 1409 int i; 1410 1411 /* 1412 * - Tentative Address (RFC2462 section 5.4) 1413 * - A tentative address is not considered 1414 * "assigned to an interface" in the traditional 1415 * sense, unless it is also flagged as optimistic. 1416 * - Candidate Source Address (section 4) 1417 * - In any case, anycast addresses, multicast 1418 * addresses, and the unspecified address MUST 1419 * NOT be included in a candidate set. 1420 */ 1421 if ((score->ifa->flags & IFA_F_TENTATIVE) && 1422 (!(score->ifa->flags & IFA_F_OPTIMISTIC))) 1423 continue; 1424 1425 score->addr_type = __ipv6_addr_type(&score->ifa->addr); 1426 1427 if (unlikely(score->addr_type == IPV6_ADDR_ANY || 1428 score->addr_type & IPV6_ADDR_MULTICAST)) { 1429 net_dbg_ratelimited("ADDRCONF: unspecified / multicast address assigned as unicast address on %s", 1430 dev->name); 1431 continue; 1432 } 1433 1434 score->rule = -1; 1435 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX); 1436 1437 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) { 1438 int minihiscore, miniscore; 1439 1440 minihiscore = ipv6_get_saddr_eval(net, hiscore, &dst, i); 1441 miniscore = ipv6_get_saddr_eval(net, score, &dst, i); 1442 1443 if (minihiscore > miniscore) { 1444 if (i == IPV6_SADDR_RULE_SCOPE && 1445 score->scopedist > 0) { 1446 /* 1447 * special case: 1448 * each remaining entry 1449 * has too small (not enough) 1450 * scope, because ifa entries 1451 * are sorted by their scope 1452 * values. 1453 */ 1454 goto try_nextdev; 1455 } 1456 break; 1457 } else if (minihiscore < miniscore) { 1458 if (hiscore->ifa) 1459 in6_ifa_put(hiscore->ifa); 1460 1461 in6_ifa_hold(score->ifa); 1462 1463 swap(hiscore, score); 1464 1465 /* restore our iterator */ 1466 score->ifa = hiscore->ifa; 1467 1468 break; 1469 } 1470 } 1471 } 1472 try_nextdev: 1473 read_unlock_bh(&idev->lock); 1474 } 1475 rcu_read_unlock(); 1476 1477 if (!hiscore->ifa) 1478 return -EADDRNOTAVAIL; 1479 1480 *saddr = hiscore->ifa->addr; 1481 in6_ifa_put(hiscore->ifa); 1482 return 0; 1483 } 1484 EXPORT_SYMBOL(ipv6_dev_get_saddr); 1485 1486 int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr, 1487 u32 banned_flags) 1488 { 1489 struct inet6_ifaddr *ifp; 1490 int err = -EADDRNOTAVAIL; 1491 1492 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) { 1493 if (ifp->scope > IFA_LINK) 1494 break; 1495 if (ifp->scope == IFA_LINK && 1496 !(ifp->flags & banned_flags)) { 1497 *addr = ifp->addr; 1498 err = 0; 1499 break; 1500 } 1501 } 1502 return err; 1503 } 1504 1505 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr, 1506 u32 banned_flags) 1507 { 1508 struct inet6_dev *idev; 1509 int err = -EADDRNOTAVAIL; 1510 1511 rcu_read_lock(); 1512 idev = __in6_dev_get(dev); 1513 if (idev) { 1514 read_lock_bh(&idev->lock); 1515 err = __ipv6_get_lladdr(idev, addr, banned_flags); 1516 read_unlock_bh(&idev->lock); 1517 } 1518 rcu_read_unlock(); 1519 return err; 1520 } 1521 1522 static int ipv6_count_addresses(struct inet6_dev *idev) 1523 { 1524 int cnt = 0; 1525 struct inet6_ifaddr *ifp; 1526 1527 read_lock_bh(&idev->lock); 1528 list_for_each_entry(ifp, &idev->addr_list, if_list) 1529 cnt++; 1530 read_unlock_bh(&idev->lock); 1531 return cnt; 1532 } 1533 1534 int ipv6_chk_addr(struct net *net, const struct in6_addr *addr, 1535 const struct net_device *dev, int strict) 1536 { 1537 return ipv6_chk_addr_and_flags(net, addr, dev, strict, IFA_F_TENTATIVE); 1538 } 1539 EXPORT_SYMBOL(ipv6_chk_addr); 1540 1541 int ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr, 1542 const struct net_device *dev, int strict, 1543 u32 banned_flags) 1544 { 1545 struct inet6_ifaddr *ifp; 1546 unsigned int hash = inet6_addr_hash(addr); 1547 u32 ifp_flags; 1548 1549 rcu_read_lock_bh(); 1550 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) { 1551 if (!net_eq(dev_net(ifp->idev->dev), net)) 1552 continue; 1553 /* Decouple optimistic from tentative for evaluation here. 1554 * Ban optimistic addresses explicitly, when required. 1555 */ 1556 ifp_flags = (ifp->flags&IFA_F_OPTIMISTIC) 1557 ? (ifp->flags&~IFA_F_TENTATIVE) 1558 : ifp->flags; 1559 if (ipv6_addr_equal(&ifp->addr, addr) && 1560 !(ifp_flags&banned_flags) && 1561 (!dev || ifp->idev->dev == dev || 1562 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) { 1563 rcu_read_unlock_bh(); 1564 return 1; 1565 } 1566 } 1567 1568 rcu_read_unlock_bh(); 1569 return 0; 1570 } 1571 EXPORT_SYMBOL(ipv6_chk_addr_and_flags); 1572 1573 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr, 1574 struct net_device *dev) 1575 { 1576 unsigned int hash = inet6_addr_hash(addr); 1577 struct inet6_ifaddr *ifp; 1578 1579 hlist_for_each_entry(ifp, &inet6_addr_lst[hash], addr_lst) { 1580 if (!net_eq(dev_net(ifp->idev->dev), net)) 1581 continue; 1582 if (ipv6_addr_equal(&ifp->addr, addr)) { 1583 if (!dev || ifp->idev->dev == dev) 1584 return true; 1585 } 1586 } 1587 return false; 1588 } 1589 1590 /* Compares an address/prefix_len with addresses on device @dev. 1591 * If one is found it returns true. 1592 */ 1593 bool ipv6_chk_custom_prefix(const struct in6_addr *addr, 1594 const unsigned int prefix_len, struct net_device *dev) 1595 { 1596 struct inet6_dev *idev; 1597 struct inet6_ifaddr *ifa; 1598 bool ret = false; 1599 1600 rcu_read_lock(); 1601 idev = __in6_dev_get(dev); 1602 if (idev) { 1603 read_lock_bh(&idev->lock); 1604 list_for_each_entry(ifa, &idev->addr_list, if_list) { 1605 ret = ipv6_prefix_equal(addr, &ifa->addr, prefix_len); 1606 if (ret) 1607 break; 1608 } 1609 read_unlock_bh(&idev->lock); 1610 } 1611 rcu_read_unlock(); 1612 1613 return ret; 1614 } 1615 EXPORT_SYMBOL(ipv6_chk_custom_prefix); 1616 1617 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev) 1618 { 1619 struct inet6_dev *idev; 1620 struct inet6_ifaddr *ifa; 1621 int onlink; 1622 1623 onlink = 0; 1624 rcu_read_lock(); 1625 idev = __in6_dev_get(dev); 1626 if (idev) { 1627 read_lock_bh(&idev->lock); 1628 list_for_each_entry(ifa, &idev->addr_list, if_list) { 1629 onlink = ipv6_prefix_equal(addr, &ifa->addr, 1630 ifa->prefix_len); 1631 if (onlink) 1632 break; 1633 } 1634 read_unlock_bh(&idev->lock); 1635 } 1636 rcu_read_unlock(); 1637 return onlink; 1638 } 1639 EXPORT_SYMBOL(ipv6_chk_prefix); 1640 1641 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr, 1642 struct net_device *dev, int strict) 1643 { 1644 struct inet6_ifaddr *ifp, *result = NULL; 1645 unsigned int hash = inet6_addr_hash(addr); 1646 1647 rcu_read_lock_bh(); 1648 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) { 1649 if (!net_eq(dev_net(ifp->idev->dev), net)) 1650 continue; 1651 if (ipv6_addr_equal(&ifp->addr, addr)) { 1652 if (!dev || ifp->idev->dev == dev || 1653 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) { 1654 result = ifp; 1655 in6_ifa_hold(ifp); 1656 break; 1657 } 1658 } 1659 } 1660 rcu_read_unlock_bh(); 1661 1662 return result; 1663 } 1664 1665 /* Gets referenced address, destroys ifaddr */ 1666 1667 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed) 1668 { 1669 if (ifp->flags&IFA_F_PERMANENT) { 1670 spin_lock_bh(&ifp->lock); 1671 addrconf_del_dad_work(ifp); 1672 ifp->flags |= IFA_F_TENTATIVE; 1673 if (dad_failed) 1674 ifp->flags |= IFA_F_DADFAILED; 1675 spin_unlock_bh(&ifp->lock); 1676 if (dad_failed) 1677 ipv6_ifa_notify(0, ifp); 1678 in6_ifa_put(ifp); 1679 } else if (ifp->flags&IFA_F_TEMPORARY) { 1680 struct inet6_ifaddr *ifpub; 1681 spin_lock_bh(&ifp->lock); 1682 ifpub = ifp->ifpub; 1683 if (ifpub) { 1684 in6_ifa_hold(ifpub); 1685 spin_unlock_bh(&ifp->lock); 1686 ipv6_create_tempaddr(ifpub, ifp); 1687 in6_ifa_put(ifpub); 1688 } else { 1689 spin_unlock_bh(&ifp->lock); 1690 } 1691 ipv6_del_addr(ifp); 1692 } else { 1693 ipv6_del_addr(ifp); 1694 } 1695 } 1696 1697 static int addrconf_dad_end(struct inet6_ifaddr *ifp) 1698 { 1699 int err = -ENOENT; 1700 1701 spin_lock_bh(&ifp->lock); 1702 if (ifp->state == INET6_IFADDR_STATE_DAD) { 1703 ifp->state = INET6_IFADDR_STATE_POSTDAD; 1704 err = 0; 1705 } 1706 spin_unlock_bh(&ifp->lock); 1707 1708 return err; 1709 } 1710 1711 void addrconf_dad_failure(struct inet6_ifaddr *ifp) 1712 { 1713 struct in6_addr addr; 1714 struct inet6_dev *idev = ifp->idev; 1715 struct net *net = dev_net(ifp->idev->dev); 1716 1717 if (addrconf_dad_end(ifp)) { 1718 in6_ifa_put(ifp); 1719 return; 1720 } 1721 1722 net_info_ratelimited("%s: IPv6 duplicate address %pI6c detected!\n", 1723 ifp->idev->dev->name, &ifp->addr); 1724 1725 spin_lock_bh(&ifp->lock); 1726 1727 if (ifp->flags & IFA_F_STABLE_PRIVACY) { 1728 int scope = ifp->scope; 1729 u32 flags = ifp->flags; 1730 struct in6_addr new_addr; 1731 struct inet6_ifaddr *ifp2; 1732 u32 valid_lft, preferred_lft; 1733 int pfxlen = ifp->prefix_len; 1734 int retries = ifp->stable_privacy_retry + 1; 1735 1736 if (retries > net->ipv6.sysctl.idgen_retries) { 1737 net_info_ratelimited("%s: privacy stable address generation failed because of DAD conflicts!\n", 1738 ifp->idev->dev->name); 1739 goto errdad; 1740 } 1741 1742 new_addr = ifp->addr; 1743 if (ipv6_generate_stable_address(&new_addr, retries, 1744 idev)) 1745 goto errdad; 1746 1747 valid_lft = ifp->valid_lft; 1748 preferred_lft = ifp->prefered_lft; 1749 1750 spin_unlock_bh(&ifp->lock); 1751 1752 if (idev->cnf.max_addresses && 1753 ipv6_count_addresses(idev) >= 1754 idev->cnf.max_addresses) 1755 goto lock_errdad; 1756 1757 net_info_ratelimited("%s: generating new stable privacy address because of DAD conflict\n", 1758 ifp->idev->dev->name); 1759 1760 ifp2 = ipv6_add_addr(idev, &new_addr, NULL, pfxlen, 1761 scope, flags, valid_lft, 1762 preferred_lft); 1763 if (IS_ERR(ifp2)) 1764 goto lock_errdad; 1765 1766 spin_lock_bh(&ifp2->lock); 1767 ifp2->stable_privacy_retry = retries; 1768 ifp2->state = INET6_IFADDR_STATE_PREDAD; 1769 spin_unlock_bh(&ifp2->lock); 1770 1771 addrconf_mod_dad_work(ifp2, net->ipv6.sysctl.idgen_delay); 1772 in6_ifa_put(ifp2); 1773 lock_errdad: 1774 spin_lock_bh(&ifp->lock); 1775 } else if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6) { 1776 addr.s6_addr32[0] = htonl(0xfe800000); 1777 addr.s6_addr32[1] = 0; 1778 1779 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) && 1780 ipv6_addr_equal(&ifp->addr, &addr)) { 1781 /* DAD failed for link-local based on MAC address */ 1782 idev->cnf.disable_ipv6 = 1; 1783 1784 pr_info("%s: IPv6 being disabled!\n", 1785 ifp->idev->dev->name); 1786 } 1787 } 1788 1789 errdad: 1790 /* transition from _POSTDAD to _ERRDAD */ 1791 ifp->state = INET6_IFADDR_STATE_ERRDAD; 1792 spin_unlock_bh(&ifp->lock); 1793 1794 addrconf_mod_dad_work(ifp, 0); 1795 } 1796 1797 /* Join to solicited addr multicast group. 1798 * caller must hold RTNL */ 1799 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr) 1800 { 1801 struct in6_addr maddr; 1802 1803 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP)) 1804 return; 1805 1806 addrconf_addr_solict_mult(addr, &maddr); 1807 ipv6_dev_mc_inc(dev, &maddr); 1808 } 1809 1810 /* caller must hold RTNL */ 1811 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr) 1812 { 1813 struct in6_addr maddr; 1814 1815 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP)) 1816 return; 1817 1818 addrconf_addr_solict_mult(addr, &maddr); 1819 __ipv6_dev_mc_dec(idev, &maddr); 1820 } 1821 1822 /* caller must hold RTNL */ 1823 static void addrconf_join_anycast(struct inet6_ifaddr *ifp) 1824 { 1825 struct in6_addr addr; 1826 1827 if (ifp->prefix_len >= 127) /* RFC 6164 */ 1828 return; 1829 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len); 1830 if (ipv6_addr_any(&addr)) 1831 return; 1832 __ipv6_dev_ac_inc(ifp->idev, &addr); 1833 } 1834 1835 /* caller must hold RTNL */ 1836 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp) 1837 { 1838 struct in6_addr addr; 1839 1840 if (ifp->prefix_len >= 127) /* RFC 6164 */ 1841 return; 1842 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len); 1843 if (ipv6_addr_any(&addr)) 1844 return; 1845 __ipv6_dev_ac_dec(ifp->idev, &addr); 1846 } 1847 1848 static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev) 1849 { 1850 if (dev->addr_len != ETH_ALEN) 1851 return -1; 1852 memcpy(eui, dev->dev_addr, 3); 1853 memcpy(eui + 5, dev->dev_addr + 3, 3); 1854 1855 /* 1856 * The zSeries OSA network cards can be shared among various 1857 * OS instances, but the OSA cards have only one MAC address. 1858 * This leads to duplicate address conflicts in conjunction 1859 * with IPv6 if more than one instance uses the same card. 1860 * 1861 * The driver for these cards can deliver a unique 16-bit 1862 * identifier for each instance sharing the same card. It is 1863 * placed instead of 0xFFFE in the interface identifier. The 1864 * "u" bit of the interface identifier is not inverted in this 1865 * case. Hence the resulting interface identifier has local 1866 * scope according to RFC2373. 1867 */ 1868 if (dev->dev_id) { 1869 eui[3] = (dev->dev_id >> 8) & 0xFF; 1870 eui[4] = dev->dev_id & 0xFF; 1871 } else { 1872 eui[3] = 0xFF; 1873 eui[4] = 0xFE; 1874 eui[0] ^= 2; 1875 } 1876 return 0; 1877 } 1878 1879 static int addrconf_ifid_eui64(u8 *eui, struct net_device *dev) 1880 { 1881 if (dev->addr_len != IEEE802154_ADDR_LEN) 1882 return -1; 1883 memcpy(eui, dev->dev_addr, 8); 1884 eui[0] ^= 2; 1885 return 0; 1886 } 1887 1888 static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev) 1889 { 1890 union fwnet_hwaddr *ha; 1891 1892 if (dev->addr_len != FWNET_ALEN) 1893 return -1; 1894 1895 ha = (union fwnet_hwaddr *)dev->dev_addr; 1896 1897 memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id)); 1898 eui[0] ^= 2; 1899 return 0; 1900 } 1901 1902 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev) 1903 { 1904 /* XXX: inherit EUI-64 from other interface -- yoshfuji */ 1905 if (dev->addr_len != ARCNET_ALEN) 1906 return -1; 1907 memset(eui, 0, 7); 1908 eui[7] = *(u8 *)dev->dev_addr; 1909 return 0; 1910 } 1911 1912 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev) 1913 { 1914 if (dev->addr_len != INFINIBAND_ALEN) 1915 return -1; 1916 memcpy(eui, dev->dev_addr + 12, 8); 1917 eui[0] |= 2; 1918 return 0; 1919 } 1920 1921 static int __ipv6_isatap_ifid(u8 *eui, __be32 addr) 1922 { 1923 if (addr == 0) 1924 return -1; 1925 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) || 1926 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) || 1927 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) || 1928 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) || 1929 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) || 1930 ipv4_is_lbcast(addr)) ? 0x00 : 0x02; 1931 eui[1] = 0; 1932 eui[2] = 0x5E; 1933 eui[3] = 0xFE; 1934 memcpy(eui + 4, &addr, 4); 1935 return 0; 1936 } 1937 1938 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev) 1939 { 1940 if (dev->priv_flags & IFF_ISATAP) 1941 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr); 1942 return -1; 1943 } 1944 1945 static int addrconf_ifid_gre(u8 *eui, struct net_device *dev) 1946 { 1947 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr); 1948 } 1949 1950 static int addrconf_ifid_ip6tnl(u8 *eui, struct net_device *dev) 1951 { 1952 memcpy(eui, dev->perm_addr, 3); 1953 memcpy(eui + 5, dev->perm_addr + 3, 3); 1954 eui[3] = 0xFF; 1955 eui[4] = 0xFE; 1956 eui[0] ^= 2; 1957 return 0; 1958 } 1959 1960 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev) 1961 { 1962 switch (dev->type) { 1963 case ARPHRD_ETHER: 1964 case ARPHRD_FDDI: 1965 return addrconf_ifid_eui48(eui, dev); 1966 case ARPHRD_ARCNET: 1967 return addrconf_ifid_arcnet(eui, dev); 1968 case ARPHRD_INFINIBAND: 1969 return addrconf_ifid_infiniband(eui, dev); 1970 case ARPHRD_SIT: 1971 return addrconf_ifid_sit(eui, dev); 1972 case ARPHRD_IPGRE: 1973 return addrconf_ifid_gre(eui, dev); 1974 case ARPHRD_6LOWPAN: 1975 case ARPHRD_IEEE802154: 1976 return addrconf_ifid_eui64(eui, dev); 1977 case ARPHRD_IEEE1394: 1978 return addrconf_ifid_ieee1394(eui, dev); 1979 case ARPHRD_TUNNEL6: 1980 return addrconf_ifid_ip6tnl(eui, dev); 1981 } 1982 return -1; 1983 } 1984 1985 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev) 1986 { 1987 int err = -1; 1988 struct inet6_ifaddr *ifp; 1989 1990 read_lock_bh(&idev->lock); 1991 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) { 1992 if (ifp->scope > IFA_LINK) 1993 break; 1994 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) { 1995 memcpy(eui, ifp->addr.s6_addr+8, 8); 1996 err = 0; 1997 break; 1998 } 1999 } 2000 read_unlock_bh(&idev->lock); 2001 return err; 2002 } 2003 2004 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */ 2005 static void __ipv6_regen_rndid(struct inet6_dev *idev) 2006 { 2007 regen: 2008 get_random_bytes(idev->rndid, sizeof(idev->rndid)); 2009 idev->rndid[0] &= ~0x02; 2010 2011 /* 2012 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>: 2013 * check if generated address is not inappropriate 2014 * 2015 * - Reserved subnet anycast (RFC 2526) 2016 * 11111101 11....11 1xxxxxxx 2017 * - ISATAP (RFC4214) 6.1 2018 * 00-00-5E-FE-xx-xx-xx-xx 2019 * - value 0 2020 * - XXX: already assigned to an address on the device 2021 */ 2022 if (idev->rndid[0] == 0xfd && 2023 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff && 2024 (idev->rndid[7]&0x80)) 2025 goto regen; 2026 if ((idev->rndid[0]|idev->rndid[1]) == 0) { 2027 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe) 2028 goto regen; 2029 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00) 2030 goto regen; 2031 } 2032 } 2033 2034 static void ipv6_regen_rndid(unsigned long data) 2035 { 2036 struct inet6_dev *idev = (struct inet6_dev *) data; 2037 unsigned long expires; 2038 2039 rcu_read_lock_bh(); 2040 write_lock_bh(&idev->lock); 2041 2042 if (idev->dead) 2043 goto out; 2044 2045 __ipv6_regen_rndid(idev); 2046 2047 expires = jiffies + 2048 idev->cnf.temp_prefered_lft * HZ - 2049 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * 2050 NEIGH_VAR(idev->nd_parms, RETRANS_TIME) - 2051 idev->cnf.max_desync_factor * HZ; 2052 if (time_before(expires, jiffies)) { 2053 pr_warn("%s: too short regeneration interval; timer disabled for %s\n", 2054 __func__, idev->dev->name); 2055 goto out; 2056 } 2057 2058 if (!mod_timer(&idev->regen_timer, expires)) 2059 in6_dev_hold(idev); 2060 2061 out: 2062 write_unlock_bh(&idev->lock); 2063 rcu_read_unlock_bh(); 2064 in6_dev_put(idev); 2065 } 2066 2067 static void __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) 2068 { 2069 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0) 2070 __ipv6_regen_rndid(idev); 2071 } 2072 2073 /* 2074 * Add prefix route. 2075 */ 2076 2077 static void 2078 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev, 2079 unsigned long expires, u32 flags) 2080 { 2081 struct fib6_config cfg = { 2082 .fc_table = RT6_TABLE_PREFIX, 2083 .fc_metric = IP6_RT_PRIO_ADDRCONF, 2084 .fc_ifindex = dev->ifindex, 2085 .fc_expires = expires, 2086 .fc_dst_len = plen, 2087 .fc_flags = RTF_UP | flags, 2088 .fc_nlinfo.nl_net = dev_net(dev), 2089 .fc_protocol = RTPROT_KERNEL, 2090 }; 2091 2092 cfg.fc_dst = *pfx; 2093 2094 /* Prevent useless cloning on PtP SIT. 2095 This thing is done here expecting that the whole 2096 class of non-broadcast devices need not cloning. 2097 */ 2098 #if IS_ENABLED(CONFIG_IPV6_SIT) 2099 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT)) 2100 cfg.fc_flags |= RTF_NONEXTHOP; 2101 #endif 2102 2103 ip6_route_add(&cfg); 2104 } 2105 2106 2107 static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx, 2108 int plen, 2109 const struct net_device *dev, 2110 u32 flags, u32 noflags) 2111 { 2112 struct fib6_node *fn; 2113 struct rt6_info *rt = NULL; 2114 struct fib6_table *table; 2115 2116 table = fib6_get_table(dev_net(dev), RT6_TABLE_PREFIX); 2117 if (!table) 2118 return NULL; 2119 2120 read_lock_bh(&table->tb6_lock); 2121 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0); 2122 if (!fn) 2123 goto out; 2124 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) { 2125 if (rt->dst.dev->ifindex != dev->ifindex) 2126 continue; 2127 if ((rt->rt6i_flags & flags) != flags) 2128 continue; 2129 if ((rt->rt6i_flags & noflags) != 0) 2130 continue; 2131 dst_hold(&rt->dst); 2132 break; 2133 } 2134 out: 2135 read_unlock_bh(&table->tb6_lock); 2136 return rt; 2137 } 2138 2139 2140 /* Create "default" multicast route to the interface */ 2141 2142 static void addrconf_add_mroute(struct net_device *dev) 2143 { 2144 struct fib6_config cfg = { 2145 .fc_table = RT6_TABLE_LOCAL, 2146 .fc_metric = IP6_RT_PRIO_ADDRCONF, 2147 .fc_ifindex = dev->ifindex, 2148 .fc_dst_len = 8, 2149 .fc_flags = RTF_UP, 2150 .fc_nlinfo.nl_net = dev_net(dev), 2151 }; 2152 2153 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0); 2154 2155 ip6_route_add(&cfg); 2156 } 2157 2158 static struct inet6_dev *addrconf_add_dev(struct net_device *dev) 2159 { 2160 struct inet6_dev *idev; 2161 2162 ASSERT_RTNL(); 2163 2164 idev = ipv6_find_idev(dev); 2165 if (!idev) 2166 return ERR_PTR(-ENOBUFS); 2167 2168 if (idev->cnf.disable_ipv6) 2169 return ERR_PTR(-EACCES); 2170 2171 /* Add default multicast route */ 2172 if (!(dev->flags & IFF_LOOPBACK)) 2173 addrconf_add_mroute(dev); 2174 2175 return idev; 2176 } 2177 2178 static void manage_tempaddrs(struct inet6_dev *idev, 2179 struct inet6_ifaddr *ifp, 2180 __u32 valid_lft, __u32 prefered_lft, 2181 bool create, unsigned long now) 2182 { 2183 u32 flags; 2184 struct inet6_ifaddr *ift; 2185 2186 read_lock_bh(&idev->lock); 2187 /* update all temporary addresses in the list */ 2188 list_for_each_entry(ift, &idev->tempaddr_list, tmp_list) { 2189 int age, max_valid, max_prefered; 2190 2191 if (ifp != ift->ifpub) 2192 continue; 2193 2194 /* RFC 4941 section 3.3: 2195 * If a received option will extend the lifetime of a public 2196 * address, the lifetimes of temporary addresses should 2197 * be extended, subject to the overall constraint that no 2198 * temporary addresses should ever remain "valid" or "preferred" 2199 * for a time longer than (TEMP_VALID_LIFETIME) or 2200 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), respectively. 2201 */ 2202 age = (now - ift->cstamp) / HZ; 2203 max_valid = idev->cnf.temp_valid_lft - age; 2204 if (max_valid < 0) 2205 max_valid = 0; 2206 2207 max_prefered = idev->cnf.temp_prefered_lft - 2208 idev->cnf.max_desync_factor - age; 2209 if (max_prefered < 0) 2210 max_prefered = 0; 2211 2212 if (valid_lft > max_valid) 2213 valid_lft = max_valid; 2214 2215 if (prefered_lft > max_prefered) 2216 prefered_lft = max_prefered; 2217 2218 spin_lock(&ift->lock); 2219 flags = ift->flags; 2220 ift->valid_lft = valid_lft; 2221 ift->prefered_lft = prefered_lft; 2222 ift->tstamp = now; 2223 if (prefered_lft > 0) 2224 ift->flags &= ~IFA_F_DEPRECATED; 2225 2226 spin_unlock(&ift->lock); 2227 if (!(flags&IFA_F_TENTATIVE)) 2228 ipv6_ifa_notify(0, ift); 2229 } 2230 2231 if ((create || list_empty(&idev->tempaddr_list)) && 2232 idev->cnf.use_tempaddr > 0) { 2233 /* When a new public address is created as described 2234 * in [ADDRCONF], also create a new temporary address. 2235 * Also create a temporary address if it's enabled but 2236 * no temporary address currently exists. 2237 */ 2238 read_unlock_bh(&idev->lock); 2239 ipv6_create_tempaddr(ifp, NULL); 2240 } else { 2241 read_unlock_bh(&idev->lock); 2242 } 2243 } 2244 2245 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao) 2246 { 2247 struct prefix_info *pinfo; 2248 __u32 valid_lft; 2249 __u32 prefered_lft; 2250 int addr_type; 2251 u32 addr_flags = 0; 2252 struct inet6_dev *in6_dev; 2253 struct net *net = dev_net(dev); 2254 2255 pinfo = (struct prefix_info *) opt; 2256 2257 if (len < sizeof(struct prefix_info)) { 2258 ADBG("addrconf: prefix option too short\n"); 2259 return; 2260 } 2261 2262 /* 2263 * Validation checks ([ADDRCONF], page 19) 2264 */ 2265 2266 addr_type = ipv6_addr_type(&pinfo->prefix); 2267 2268 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL)) 2269 return; 2270 2271 valid_lft = ntohl(pinfo->valid); 2272 prefered_lft = ntohl(pinfo->prefered); 2273 2274 if (prefered_lft > valid_lft) { 2275 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n"); 2276 return; 2277 } 2278 2279 in6_dev = in6_dev_get(dev); 2280 2281 if (!in6_dev) { 2282 net_dbg_ratelimited("addrconf: device %s not configured\n", 2283 dev->name); 2284 return; 2285 } 2286 2287 /* 2288 * Two things going on here: 2289 * 1) Add routes for on-link prefixes 2290 * 2) Configure prefixes with the auto flag set 2291 */ 2292 2293 if (pinfo->onlink) { 2294 struct rt6_info *rt; 2295 unsigned long rt_expires; 2296 2297 /* Avoid arithmetic overflow. Really, we could 2298 * save rt_expires in seconds, likely valid_lft, 2299 * but it would require division in fib gc, that it 2300 * not good. 2301 */ 2302 if (HZ > USER_HZ) 2303 rt_expires = addrconf_timeout_fixup(valid_lft, HZ); 2304 else 2305 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ); 2306 2307 if (addrconf_finite_timeout(rt_expires)) 2308 rt_expires *= HZ; 2309 2310 rt = addrconf_get_prefix_route(&pinfo->prefix, 2311 pinfo->prefix_len, 2312 dev, 2313 RTF_ADDRCONF | RTF_PREFIX_RT, 2314 RTF_GATEWAY | RTF_DEFAULT); 2315 2316 if (rt) { 2317 /* Autoconf prefix route */ 2318 if (valid_lft == 0) { 2319 ip6_del_rt(rt); 2320 rt = NULL; 2321 } else if (addrconf_finite_timeout(rt_expires)) { 2322 /* not infinity */ 2323 rt6_set_expires(rt, jiffies + rt_expires); 2324 } else { 2325 rt6_clean_expires(rt); 2326 } 2327 } else if (valid_lft) { 2328 clock_t expires = 0; 2329 int flags = RTF_ADDRCONF | RTF_PREFIX_RT; 2330 if (addrconf_finite_timeout(rt_expires)) { 2331 /* not infinity */ 2332 flags |= RTF_EXPIRES; 2333 expires = jiffies_to_clock_t(rt_expires); 2334 } 2335 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len, 2336 dev, expires, flags); 2337 } 2338 ip6_rt_put(rt); 2339 } 2340 2341 /* Try to figure out our local address for this prefix */ 2342 2343 if (pinfo->autoconf && in6_dev->cnf.autoconf) { 2344 struct inet6_ifaddr *ifp; 2345 struct in6_addr addr; 2346 int create = 0, update_lft = 0; 2347 bool tokenized = false; 2348 2349 if (pinfo->prefix_len == 64) { 2350 memcpy(&addr, &pinfo->prefix, 8); 2351 2352 if (!ipv6_addr_any(&in6_dev->token)) { 2353 read_lock_bh(&in6_dev->lock); 2354 memcpy(addr.s6_addr + 8, 2355 in6_dev->token.s6_addr + 8, 8); 2356 read_unlock_bh(&in6_dev->lock); 2357 tokenized = true; 2358 } else if (in6_dev->addr_gen_mode == 2359 IN6_ADDR_GEN_MODE_STABLE_PRIVACY && 2360 !ipv6_generate_stable_address(&addr, 0, 2361 in6_dev)) { 2362 addr_flags |= IFA_F_STABLE_PRIVACY; 2363 goto ok; 2364 } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) && 2365 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) { 2366 in6_dev_put(in6_dev); 2367 return; 2368 } 2369 goto ok; 2370 } 2371 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n", 2372 pinfo->prefix_len); 2373 in6_dev_put(in6_dev); 2374 return; 2375 2376 ok: 2377 2378 ifp = ipv6_get_ifaddr(net, &addr, dev, 1); 2379 2380 if (!ifp && valid_lft) { 2381 int max_addresses = in6_dev->cnf.max_addresses; 2382 2383 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 2384 if (in6_dev->cnf.optimistic_dad && 2385 !net->ipv6.devconf_all->forwarding && sllao) 2386 addr_flags = IFA_F_OPTIMISTIC; 2387 #endif 2388 2389 /* Do not allow to create too much of autoconfigured 2390 * addresses; this would be too easy way to crash kernel. 2391 */ 2392 if (!max_addresses || 2393 ipv6_count_addresses(in6_dev) < max_addresses) 2394 ifp = ipv6_add_addr(in6_dev, &addr, NULL, 2395 pinfo->prefix_len, 2396 addr_type&IPV6_ADDR_SCOPE_MASK, 2397 addr_flags, valid_lft, 2398 prefered_lft); 2399 2400 if (IS_ERR_OR_NULL(ifp)) { 2401 in6_dev_put(in6_dev); 2402 return; 2403 } 2404 2405 update_lft = 0; 2406 create = 1; 2407 spin_lock_bh(&ifp->lock); 2408 ifp->flags |= IFA_F_MANAGETEMPADDR; 2409 ifp->cstamp = jiffies; 2410 ifp->tokenized = tokenized; 2411 spin_unlock_bh(&ifp->lock); 2412 addrconf_dad_start(ifp); 2413 } 2414 2415 if (ifp) { 2416 u32 flags; 2417 unsigned long now; 2418 u32 stored_lft; 2419 2420 /* update lifetime (RFC2462 5.5.3 e) */ 2421 spin_lock_bh(&ifp->lock); 2422 now = jiffies; 2423 if (ifp->valid_lft > (now - ifp->tstamp) / HZ) 2424 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ; 2425 else 2426 stored_lft = 0; 2427 if (!update_lft && !create && stored_lft) { 2428 const u32 minimum_lft = min_t(u32, 2429 stored_lft, MIN_VALID_LIFETIME); 2430 valid_lft = max(valid_lft, minimum_lft); 2431 2432 /* RFC4862 Section 5.5.3e: 2433 * "Note that the preferred lifetime of the 2434 * corresponding address is always reset to 2435 * the Preferred Lifetime in the received 2436 * Prefix Information option, regardless of 2437 * whether the valid lifetime is also reset or 2438 * ignored." 2439 * 2440 * So we should always update prefered_lft here. 2441 */ 2442 update_lft = 1; 2443 } 2444 2445 if (update_lft) { 2446 ifp->valid_lft = valid_lft; 2447 ifp->prefered_lft = prefered_lft; 2448 ifp->tstamp = now; 2449 flags = ifp->flags; 2450 ifp->flags &= ~IFA_F_DEPRECATED; 2451 spin_unlock_bh(&ifp->lock); 2452 2453 if (!(flags&IFA_F_TENTATIVE)) 2454 ipv6_ifa_notify(0, ifp); 2455 } else 2456 spin_unlock_bh(&ifp->lock); 2457 2458 manage_tempaddrs(in6_dev, ifp, valid_lft, prefered_lft, 2459 create, now); 2460 2461 in6_ifa_put(ifp); 2462 addrconf_verify(); 2463 } 2464 } 2465 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo); 2466 in6_dev_put(in6_dev); 2467 } 2468 2469 /* 2470 * Set destination address. 2471 * Special case for SIT interfaces where we create a new "virtual" 2472 * device. 2473 */ 2474 int addrconf_set_dstaddr(struct net *net, void __user *arg) 2475 { 2476 struct in6_ifreq ireq; 2477 struct net_device *dev; 2478 int err = -EINVAL; 2479 2480 rtnl_lock(); 2481 2482 err = -EFAULT; 2483 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2484 goto err_exit; 2485 2486 dev = __dev_get_by_index(net, ireq.ifr6_ifindex); 2487 2488 err = -ENODEV; 2489 if (!dev) 2490 goto err_exit; 2491 2492 #if IS_ENABLED(CONFIG_IPV6_SIT) 2493 if (dev->type == ARPHRD_SIT) { 2494 const struct net_device_ops *ops = dev->netdev_ops; 2495 struct ifreq ifr; 2496 struct ip_tunnel_parm p; 2497 2498 err = -EADDRNOTAVAIL; 2499 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4)) 2500 goto err_exit; 2501 2502 memset(&p, 0, sizeof(p)); 2503 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3]; 2504 p.iph.saddr = 0; 2505 p.iph.version = 4; 2506 p.iph.ihl = 5; 2507 p.iph.protocol = IPPROTO_IPV6; 2508 p.iph.ttl = 64; 2509 ifr.ifr_ifru.ifru_data = (__force void __user *)&p; 2510 2511 if (ops->ndo_do_ioctl) { 2512 mm_segment_t oldfs = get_fs(); 2513 2514 set_fs(KERNEL_DS); 2515 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL); 2516 set_fs(oldfs); 2517 } else 2518 err = -EOPNOTSUPP; 2519 2520 if (err == 0) { 2521 err = -ENOBUFS; 2522 dev = __dev_get_by_name(net, p.name); 2523 if (!dev) 2524 goto err_exit; 2525 err = dev_open(dev); 2526 } 2527 } 2528 #endif 2529 2530 err_exit: 2531 rtnl_unlock(); 2532 return err; 2533 } 2534 2535 static int ipv6_mc_config(struct sock *sk, bool join, 2536 const struct in6_addr *addr, int ifindex) 2537 { 2538 int ret; 2539 2540 ASSERT_RTNL(); 2541 2542 lock_sock(sk); 2543 if (join) 2544 ret = ipv6_sock_mc_join(sk, ifindex, addr); 2545 else 2546 ret = ipv6_sock_mc_drop(sk, ifindex, addr); 2547 release_sock(sk); 2548 2549 return ret; 2550 } 2551 2552 /* 2553 * Manual configuration of address on an interface 2554 */ 2555 static int inet6_addr_add(struct net *net, int ifindex, 2556 const struct in6_addr *pfx, 2557 const struct in6_addr *peer_pfx, 2558 unsigned int plen, __u32 ifa_flags, 2559 __u32 prefered_lft, __u32 valid_lft) 2560 { 2561 struct inet6_ifaddr *ifp; 2562 struct inet6_dev *idev; 2563 struct net_device *dev; 2564 unsigned long timeout; 2565 clock_t expires; 2566 int scope; 2567 u32 flags; 2568 2569 ASSERT_RTNL(); 2570 2571 if (plen > 128) 2572 return -EINVAL; 2573 2574 /* check the lifetime */ 2575 if (!valid_lft || prefered_lft > valid_lft) 2576 return -EINVAL; 2577 2578 if (ifa_flags & IFA_F_MANAGETEMPADDR && plen != 64) 2579 return -EINVAL; 2580 2581 dev = __dev_get_by_index(net, ifindex); 2582 if (!dev) 2583 return -ENODEV; 2584 2585 idev = addrconf_add_dev(dev); 2586 if (IS_ERR(idev)) 2587 return PTR_ERR(idev); 2588 2589 if (ifa_flags & IFA_F_MCAUTOJOIN) { 2590 int ret = ipv6_mc_config(net->ipv6.mc_autojoin_sk, 2591 true, pfx, ifindex); 2592 2593 if (ret < 0) 2594 return ret; 2595 } 2596 2597 scope = ipv6_addr_scope(pfx); 2598 2599 timeout = addrconf_timeout_fixup(valid_lft, HZ); 2600 if (addrconf_finite_timeout(timeout)) { 2601 expires = jiffies_to_clock_t(timeout * HZ); 2602 valid_lft = timeout; 2603 flags = RTF_EXPIRES; 2604 } else { 2605 expires = 0; 2606 flags = 0; 2607 ifa_flags |= IFA_F_PERMANENT; 2608 } 2609 2610 timeout = addrconf_timeout_fixup(prefered_lft, HZ); 2611 if (addrconf_finite_timeout(timeout)) { 2612 if (timeout == 0) 2613 ifa_flags |= IFA_F_DEPRECATED; 2614 prefered_lft = timeout; 2615 } 2616 2617 ifp = ipv6_add_addr(idev, pfx, peer_pfx, plen, scope, ifa_flags, 2618 valid_lft, prefered_lft); 2619 2620 if (!IS_ERR(ifp)) { 2621 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) { 2622 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev, 2623 expires, flags); 2624 } 2625 2626 /* 2627 * Note that section 3.1 of RFC 4429 indicates 2628 * that the Optimistic flag should not be set for 2629 * manually configured addresses 2630 */ 2631 addrconf_dad_start(ifp); 2632 if (ifa_flags & IFA_F_MANAGETEMPADDR) 2633 manage_tempaddrs(idev, ifp, valid_lft, prefered_lft, 2634 true, jiffies); 2635 in6_ifa_put(ifp); 2636 addrconf_verify_rtnl(); 2637 return 0; 2638 } else if (ifa_flags & IFA_F_MCAUTOJOIN) { 2639 ipv6_mc_config(net->ipv6.mc_autojoin_sk, 2640 false, pfx, ifindex); 2641 } 2642 2643 return PTR_ERR(ifp); 2644 } 2645 2646 static int inet6_addr_del(struct net *net, int ifindex, u32 ifa_flags, 2647 const struct in6_addr *pfx, unsigned int plen) 2648 { 2649 struct inet6_ifaddr *ifp; 2650 struct inet6_dev *idev; 2651 struct net_device *dev; 2652 2653 if (plen > 128) 2654 return -EINVAL; 2655 2656 dev = __dev_get_by_index(net, ifindex); 2657 if (!dev) 2658 return -ENODEV; 2659 2660 idev = __in6_dev_get(dev); 2661 if (!idev) 2662 return -ENXIO; 2663 2664 read_lock_bh(&idev->lock); 2665 list_for_each_entry(ifp, &idev->addr_list, if_list) { 2666 if (ifp->prefix_len == plen && 2667 ipv6_addr_equal(pfx, &ifp->addr)) { 2668 in6_ifa_hold(ifp); 2669 read_unlock_bh(&idev->lock); 2670 2671 if (!(ifp->flags & IFA_F_TEMPORARY) && 2672 (ifa_flags & IFA_F_MANAGETEMPADDR)) 2673 manage_tempaddrs(idev, ifp, 0, 0, false, 2674 jiffies); 2675 ipv6_del_addr(ifp); 2676 addrconf_verify_rtnl(); 2677 if (ipv6_addr_is_multicast(pfx)) { 2678 ipv6_mc_config(net->ipv6.mc_autojoin_sk, 2679 false, pfx, dev->ifindex); 2680 } 2681 return 0; 2682 } 2683 } 2684 read_unlock_bh(&idev->lock); 2685 return -EADDRNOTAVAIL; 2686 } 2687 2688 2689 int addrconf_add_ifaddr(struct net *net, void __user *arg) 2690 { 2691 struct in6_ifreq ireq; 2692 int err; 2693 2694 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 2695 return -EPERM; 2696 2697 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2698 return -EFAULT; 2699 2700 rtnl_lock(); 2701 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, NULL, 2702 ireq.ifr6_prefixlen, IFA_F_PERMANENT, 2703 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME); 2704 rtnl_unlock(); 2705 return err; 2706 } 2707 2708 int addrconf_del_ifaddr(struct net *net, void __user *arg) 2709 { 2710 struct in6_ifreq ireq; 2711 int err; 2712 2713 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 2714 return -EPERM; 2715 2716 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2717 return -EFAULT; 2718 2719 rtnl_lock(); 2720 err = inet6_addr_del(net, ireq.ifr6_ifindex, 0, &ireq.ifr6_addr, 2721 ireq.ifr6_prefixlen); 2722 rtnl_unlock(); 2723 return err; 2724 } 2725 2726 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr, 2727 int plen, int scope) 2728 { 2729 struct inet6_ifaddr *ifp; 2730 2731 ifp = ipv6_add_addr(idev, addr, NULL, plen, 2732 scope, IFA_F_PERMANENT, 2733 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME); 2734 if (!IS_ERR(ifp)) { 2735 spin_lock_bh(&ifp->lock); 2736 ifp->flags &= ~IFA_F_TENTATIVE; 2737 spin_unlock_bh(&ifp->lock); 2738 ipv6_ifa_notify(RTM_NEWADDR, ifp); 2739 in6_ifa_put(ifp); 2740 } 2741 } 2742 2743 #if IS_ENABLED(CONFIG_IPV6_SIT) 2744 static void sit_add_v4_addrs(struct inet6_dev *idev) 2745 { 2746 struct in6_addr addr; 2747 struct net_device *dev; 2748 struct net *net = dev_net(idev->dev); 2749 int scope, plen; 2750 u32 pflags = 0; 2751 2752 ASSERT_RTNL(); 2753 2754 memset(&addr, 0, sizeof(struct in6_addr)); 2755 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4); 2756 2757 if (idev->dev->flags&IFF_POINTOPOINT) { 2758 addr.s6_addr32[0] = htonl(0xfe800000); 2759 scope = IFA_LINK; 2760 plen = 64; 2761 } else { 2762 scope = IPV6_ADDR_COMPATv4; 2763 plen = 96; 2764 pflags |= RTF_NONEXTHOP; 2765 } 2766 2767 if (addr.s6_addr32[3]) { 2768 add_addr(idev, &addr, plen, scope); 2769 addrconf_prefix_route(&addr, plen, idev->dev, 0, pflags); 2770 return; 2771 } 2772 2773 for_each_netdev(net, dev) { 2774 struct in_device *in_dev = __in_dev_get_rtnl(dev); 2775 if (in_dev && (dev->flags & IFF_UP)) { 2776 struct in_ifaddr *ifa; 2777 2778 int flag = scope; 2779 2780 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) { 2781 2782 addr.s6_addr32[3] = ifa->ifa_local; 2783 2784 if (ifa->ifa_scope == RT_SCOPE_LINK) 2785 continue; 2786 if (ifa->ifa_scope >= RT_SCOPE_HOST) { 2787 if (idev->dev->flags&IFF_POINTOPOINT) 2788 continue; 2789 flag |= IFA_HOST; 2790 } 2791 2792 add_addr(idev, &addr, plen, flag); 2793 addrconf_prefix_route(&addr, plen, idev->dev, 0, 2794 pflags); 2795 } 2796 } 2797 } 2798 } 2799 #endif 2800 2801 static void init_loopback(struct net_device *dev) 2802 { 2803 struct inet6_dev *idev; 2804 struct net_device *sp_dev; 2805 struct inet6_ifaddr *sp_ifa; 2806 struct rt6_info *sp_rt; 2807 2808 /* ::1 */ 2809 2810 ASSERT_RTNL(); 2811 2812 idev = ipv6_find_idev(dev); 2813 if (!idev) { 2814 pr_debug("%s: add_dev failed\n", __func__); 2815 return; 2816 } 2817 2818 add_addr(idev, &in6addr_loopback, 128, IFA_HOST); 2819 2820 /* Add routes to other interface's IPv6 addresses */ 2821 for_each_netdev(dev_net(dev), sp_dev) { 2822 if (!strcmp(sp_dev->name, dev->name)) 2823 continue; 2824 2825 idev = __in6_dev_get(sp_dev); 2826 if (!idev) 2827 continue; 2828 2829 read_lock_bh(&idev->lock); 2830 list_for_each_entry(sp_ifa, &idev->addr_list, if_list) { 2831 2832 if (sp_ifa->flags & (IFA_F_DADFAILED | IFA_F_TENTATIVE)) 2833 continue; 2834 2835 if (sp_ifa->rt) { 2836 /* This dst has been added to garbage list when 2837 * lo device down, release this obsolete dst and 2838 * reallocate a new router for ifa. 2839 */ 2840 if (sp_ifa->rt->dst.obsolete > 0) { 2841 ip6_rt_put(sp_ifa->rt); 2842 sp_ifa->rt = NULL; 2843 } else { 2844 continue; 2845 } 2846 } 2847 2848 sp_rt = addrconf_dst_alloc(idev, &sp_ifa->addr, false); 2849 2850 /* Failure cases are ignored */ 2851 if (!IS_ERR(sp_rt)) { 2852 sp_ifa->rt = sp_rt; 2853 ip6_ins_rt(sp_rt); 2854 } 2855 } 2856 read_unlock_bh(&idev->lock); 2857 } 2858 } 2859 2860 static void addrconf_add_linklocal(struct inet6_dev *idev, 2861 const struct in6_addr *addr, u32 flags) 2862 { 2863 struct inet6_ifaddr *ifp; 2864 u32 addr_flags = flags | IFA_F_PERMANENT; 2865 2866 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 2867 if (idev->cnf.optimistic_dad && 2868 !dev_net(idev->dev)->ipv6.devconf_all->forwarding) 2869 addr_flags |= IFA_F_OPTIMISTIC; 2870 #endif 2871 2872 ifp = ipv6_add_addr(idev, addr, NULL, 64, IFA_LINK, addr_flags, 2873 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME); 2874 if (!IS_ERR(ifp)) { 2875 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0); 2876 addrconf_dad_start(ifp); 2877 in6_ifa_put(ifp); 2878 } 2879 } 2880 2881 static bool ipv6_reserved_interfaceid(struct in6_addr address) 2882 { 2883 if ((address.s6_addr32[2] | address.s6_addr32[3]) == 0) 2884 return true; 2885 2886 if (address.s6_addr32[2] == htonl(0x02005eff) && 2887 ((address.s6_addr32[3] & htonl(0xfe000000)) == htonl(0xfe000000))) 2888 return true; 2889 2890 if (address.s6_addr32[2] == htonl(0xfdffffff) && 2891 ((address.s6_addr32[3] & htonl(0xffffff80)) == htonl(0xffffff80))) 2892 return true; 2893 2894 return false; 2895 } 2896 2897 static int ipv6_generate_stable_address(struct in6_addr *address, 2898 u8 dad_count, 2899 const struct inet6_dev *idev) 2900 { 2901 static DEFINE_SPINLOCK(lock); 2902 static __u32 digest[SHA_DIGEST_WORDS]; 2903 static __u32 workspace[SHA_WORKSPACE_WORDS]; 2904 2905 static union { 2906 char __data[SHA_MESSAGE_BYTES]; 2907 struct { 2908 struct in6_addr secret; 2909 __be32 prefix[2]; 2910 unsigned char hwaddr[MAX_ADDR_LEN]; 2911 u8 dad_count; 2912 } __packed; 2913 } data; 2914 2915 struct in6_addr secret; 2916 struct in6_addr temp; 2917 struct net *net = dev_net(idev->dev); 2918 2919 BUILD_BUG_ON(sizeof(data.__data) != sizeof(data)); 2920 2921 if (idev->cnf.stable_secret.initialized) 2922 secret = idev->cnf.stable_secret.secret; 2923 else if (net->ipv6.devconf_dflt->stable_secret.initialized) 2924 secret = net->ipv6.devconf_dflt->stable_secret.secret; 2925 else 2926 return -1; 2927 2928 retry: 2929 spin_lock_bh(&lock); 2930 2931 sha_init(digest); 2932 memset(&data, 0, sizeof(data)); 2933 memset(workspace, 0, sizeof(workspace)); 2934 memcpy(data.hwaddr, idev->dev->perm_addr, idev->dev->addr_len); 2935 data.prefix[0] = address->s6_addr32[0]; 2936 data.prefix[1] = address->s6_addr32[1]; 2937 data.secret = secret; 2938 data.dad_count = dad_count; 2939 2940 sha_transform(digest, data.__data, workspace); 2941 2942 temp = *address; 2943 temp.s6_addr32[2] = (__force __be32)digest[0]; 2944 temp.s6_addr32[3] = (__force __be32)digest[1]; 2945 2946 spin_unlock_bh(&lock); 2947 2948 if (ipv6_reserved_interfaceid(temp)) { 2949 dad_count++; 2950 if (dad_count > dev_net(idev->dev)->ipv6.sysctl.idgen_retries) 2951 return -1; 2952 goto retry; 2953 } 2954 2955 *address = temp; 2956 return 0; 2957 } 2958 2959 static void addrconf_addr_gen(struct inet6_dev *idev, bool prefix_route) 2960 { 2961 struct in6_addr addr; 2962 2963 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0); 2964 2965 if (idev->addr_gen_mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY) { 2966 if (!ipv6_generate_stable_address(&addr, 0, idev)) 2967 addrconf_add_linklocal(idev, &addr, 2968 IFA_F_STABLE_PRIVACY); 2969 else if (prefix_route) 2970 addrconf_prefix_route(&addr, 64, idev->dev, 0, 0); 2971 } else if (idev->addr_gen_mode == IN6_ADDR_GEN_MODE_EUI64) { 2972 /* addrconf_add_linklocal also adds a prefix_route and we 2973 * only need to care about prefix routes if ipv6_generate_eui64 2974 * couldn't generate one. 2975 */ 2976 if (ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) == 0) 2977 addrconf_add_linklocal(idev, &addr, 0); 2978 else if (prefix_route) 2979 addrconf_prefix_route(&addr, 64, idev->dev, 0, 0); 2980 } 2981 } 2982 2983 static void addrconf_dev_config(struct net_device *dev) 2984 { 2985 struct inet6_dev *idev; 2986 2987 ASSERT_RTNL(); 2988 2989 if ((dev->type != ARPHRD_ETHER) && 2990 (dev->type != ARPHRD_FDDI) && 2991 (dev->type != ARPHRD_ARCNET) && 2992 (dev->type != ARPHRD_INFINIBAND) && 2993 (dev->type != ARPHRD_IEEE802154) && 2994 (dev->type != ARPHRD_IEEE1394) && 2995 (dev->type != ARPHRD_TUNNEL6) && 2996 (dev->type != ARPHRD_6LOWPAN)) { 2997 /* Alas, we support only Ethernet autoconfiguration. */ 2998 return; 2999 } 3000 3001 idev = addrconf_add_dev(dev); 3002 if (IS_ERR(idev)) 3003 return; 3004 3005 addrconf_addr_gen(idev, false); 3006 } 3007 3008 #if IS_ENABLED(CONFIG_IPV6_SIT) 3009 static void addrconf_sit_config(struct net_device *dev) 3010 { 3011 struct inet6_dev *idev; 3012 3013 ASSERT_RTNL(); 3014 3015 /* 3016 * Configure the tunnel with one of our IPv4 3017 * addresses... we should configure all of 3018 * our v4 addrs in the tunnel 3019 */ 3020 3021 idev = ipv6_find_idev(dev); 3022 if (!idev) { 3023 pr_debug("%s: add_dev failed\n", __func__); 3024 return; 3025 } 3026 3027 if (dev->priv_flags & IFF_ISATAP) { 3028 addrconf_addr_gen(idev, false); 3029 return; 3030 } 3031 3032 sit_add_v4_addrs(idev); 3033 3034 if (dev->flags&IFF_POINTOPOINT) 3035 addrconf_add_mroute(dev); 3036 } 3037 #endif 3038 3039 #if IS_ENABLED(CONFIG_NET_IPGRE) 3040 static void addrconf_gre_config(struct net_device *dev) 3041 { 3042 struct inet6_dev *idev; 3043 3044 ASSERT_RTNL(); 3045 3046 idev = ipv6_find_idev(dev); 3047 if (!idev) { 3048 pr_debug("%s: add_dev failed\n", __func__); 3049 return; 3050 } 3051 3052 addrconf_addr_gen(idev, true); 3053 } 3054 #endif 3055 3056 static int addrconf_notify(struct notifier_block *this, unsigned long event, 3057 void *ptr) 3058 { 3059 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 3060 struct inet6_dev *idev = __in6_dev_get(dev); 3061 int run_pending = 0; 3062 int err; 3063 3064 switch (event) { 3065 case NETDEV_REGISTER: 3066 if (!idev && dev->mtu >= IPV6_MIN_MTU) { 3067 idev = ipv6_add_dev(dev); 3068 if (IS_ERR(idev)) 3069 return notifier_from_errno(PTR_ERR(idev)); 3070 } 3071 break; 3072 3073 case NETDEV_UP: 3074 case NETDEV_CHANGE: 3075 if (dev->flags & IFF_SLAVE) 3076 break; 3077 3078 if (idev && idev->cnf.disable_ipv6) 3079 break; 3080 3081 if (event == NETDEV_UP) { 3082 if (!addrconf_qdisc_ok(dev)) { 3083 /* device is not ready yet. */ 3084 pr_info("ADDRCONF(NETDEV_UP): %s: link is not ready\n", 3085 dev->name); 3086 break; 3087 } 3088 3089 if (!idev && dev->mtu >= IPV6_MIN_MTU) 3090 idev = ipv6_add_dev(dev); 3091 3092 if (!IS_ERR_OR_NULL(idev)) { 3093 idev->if_flags |= IF_READY; 3094 run_pending = 1; 3095 } 3096 } else { 3097 if (!addrconf_qdisc_ok(dev)) { 3098 /* device is still not ready. */ 3099 break; 3100 } 3101 3102 if (idev) { 3103 if (idev->if_flags & IF_READY) 3104 /* device is already configured. */ 3105 break; 3106 idev->if_flags |= IF_READY; 3107 } 3108 3109 pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n", 3110 dev->name); 3111 3112 run_pending = 1; 3113 } 3114 3115 switch (dev->type) { 3116 #if IS_ENABLED(CONFIG_IPV6_SIT) 3117 case ARPHRD_SIT: 3118 addrconf_sit_config(dev); 3119 break; 3120 #endif 3121 #if IS_ENABLED(CONFIG_NET_IPGRE) 3122 case ARPHRD_IPGRE: 3123 addrconf_gre_config(dev); 3124 break; 3125 #endif 3126 case ARPHRD_LOOPBACK: 3127 init_loopback(dev); 3128 break; 3129 3130 default: 3131 addrconf_dev_config(dev); 3132 break; 3133 } 3134 3135 if (!IS_ERR_OR_NULL(idev)) { 3136 if (run_pending) 3137 addrconf_dad_run(idev); 3138 3139 /* 3140 * If the MTU changed during the interface down, 3141 * when the interface up, the changed MTU must be 3142 * reflected in the idev as well as routers. 3143 */ 3144 if (idev->cnf.mtu6 != dev->mtu && 3145 dev->mtu >= IPV6_MIN_MTU) { 3146 rt6_mtu_change(dev, dev->mtu); 3147 idev->cnf.mtu6 = dev->mtu; 3148 } 3149 idev->tstamp = jiffies; 3150 inet6_ifinfo_notify(RTM_NEWLINK, idev); 3151 3152 /* 3153 * If the changed mtu during down is lower than 3154 * IPV6_MIN_MTU stop IPv6 on this interface. 3155 */ 3156 if (dev->mtu < IPV6_MIN_MTU) 3157 addrconf_ifdown(dev, 1); 3158 } 3159 break; 3160 3161 case NETDEV_CHANGEMTU: 3162 if (idev && dev->mtu >= IPV6_MIN_MTU) { 3163 rt6_mtu_change(dev, dev->mtu); 3164 idev->cnf.mtu6 = dev->mtu; 3165 break; 3166 } 3167 3168 if (!idev && dev->mtu >= IPV6_MIN_MTU) { 3169 idev = ipv6_add_dev(dev); 3170 if (!IS_ERR(idev)) 3171 break; 3172 } 3173 3174 /* 3175 * if MTU under IPV6_MIN_MTU. 3176 * Stop IPv6 on this interface. 3177 */ 3178 3179 case NETDEV_DOWN: 3180 case NETDEV_UNREGISTER: 3181 /* 3182 * Remove all addresses from this interface. 3183 */ 3184 addrconf_ifdown(dev, event != NETDEV_DOWN); 3185 break; 3186 3187 case NETDEV_CHANGENAME: 3188 if (idev) { 3189 snmp6_unregister_dev(idev); 3190 addrconf_sysctl_unregister(idev); 3191 err = addrconf_sysctl_register(idev); 3192 if (err) 3193 return notifier_from_errno(err); 3194 err = snmp6_register_dev(idev); 3195 if (err) { 3196 addrconf_sysctl_unregister(idev); 3197 return notifier_from_errno(err); 3198 } 3199 } 3200 break; 3201 3202 case NETDEV_PRE_TYPE_CHANGE: 3203 case NETDEV_POST_TYPE_CHANGE: 3204 addrconf_type_change(dev, event); 3205 break; 3206 } 3207 3208 return NOTIFY_OK; 3209 } 3210 3211 /* 3212 * addrconf module should be notified of a device going up 3213 */ 3214 static struct notifier_block ipv6_dev_notf = { 3215 .notifier_call = addrconf_notify, 3216 }; 3217 3218 static void addrconf_type_change(struct net_device *dev, unsigned long event) 3219 { 3220 struct inet6_dev *idev; 3221 ASSERT_RTNL(); 3222 3223 idev = __in6_dev_get(dev); 3224 3225 if (event == NETDEV_POST_TYPE_CHANGE) 3226 ipv6_mc_remap(idev); 3227 else if (event == NETDEV_PRE_TYPE_CHANGE) 3228 ipv6_mc_unmap(idev); 3229 } 3230 3231 static int addrconf_ifdown(struct net_device *dev, int how) 3232 { 3233 struct net *net = dev_net(dev); 3234 struct inet6_dev *idev; 3235 struct inet6_ifaddr *ifa; 3236 int state, i; 3237 3238 ASSERT_RTNL(); 3239 3240 rt6_ifdown(net, dev); 3241 neigh_ifdown(&nd_tbl, dev); 3242 3243 idev = __in6_dev_get(dev); 3244 if (!idev) 3245 return -ENODEV; 3246 3247 /* 3248 * Step 1: remove reference to ipv6 device from parent device. 3249 * Do not dev_put! 3250 */ 3251 if (how) { 3252 idev->dead = 1; 3253 3254 /* protected by rtnl_lock */ 3255 RCU_INIT_POINTER(dev->ip6_ptr, NULL); 3256 3257 /* Step 1.5: remove snmp6 entry */ 3258 snmp6_unregister_dev(idev); 3259 3260 } 3261 3262 /* Step 2: clear hash table */ 3263 for (i = 0; i < IN6_ADDR_HSIZE; i++) { 3264 struct hlist_head *h = &inet6_addr_lst[i]; 3265 3266 spin_lock_bh(&addrconf_hash_lock); 3267 restart: 3268 hlist_for_each_entry_rcu(ifa, h, addr_lst) { 3269 if (ifa->idev == idev) { 3270 hlist_del_init_rcu(&ifa->addr_lst); 3271 addrconf_del_dad_work(ifa); 3272 goto restart; 3273 } 3274 } 3275 spin_unlock_bh(&addrconf_hash_lock); 3276 } 3277 3278 write_lock_bh(&idev->lock); 3279 3280 addrconf_del_rs_timer(idev); 3281 3282 /* Step 2: clear flags for stateless addrconf */ 3283 if (!how) 3284 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY); 3285 3286 if (how && del_timer(&idev->regen_timer)) 3287 in6_dev_put(idev); 3288 3289 /* Step 3: clear tempaddr list */ 3290 while (!list_empty(&idev->tempaddr_list)) { 3291 ifa = list_first_entry(&idev->tempaddr_list, 3292 struct inet6_ifaddr, tmp_list); 3293 list_del(&ifa->tmp_list); 3294 write_unlock_bh(&idev->lock); 3295 spin_lock_bh(&ifa->lock); 3296 3297 if (ifa->ifpub) { 3298 in6_ifa_put(ifa->ifpub); 3299 ifa->ifpub = NULL; 3300 } 3301 spin_unlock_bh(&ifa->lock); 3302 in6_ifa_put(ifa); 3303 write_lock_bh(&idev->lock); 3304 } 3305 3306 while (!list_empty(&idev->addr_list)) { 3307 ifa = list_first_entry(&idev->addr_list, 3308 struct inet6_ifaddr, if_list); 3309 addrconf_del_dad_work(ifa); 3310 3311 list_del(&ifa->if_list); 3312 3313 write_unlock_bh(&idev->lock); 3314 3315 spin_lock_bh(&ifa->lock); 3316 state = ifa->state; 3317 ifa->state = INET6_IFADDR_STATE_DEAD; 3318 spin_unlock_bh(&ifa->lock); 3319 3320 if (state != INET6_IFADDR_STATE_DEAD) { 3321 __ipv6_ifa_notify(RTM_DELADDR, ifa); 3322 inet6addr_notifier_call_chain(NETDEV_DOWN, ifa); 3323 } 3324 in6_ifa_put(ifa); 3325 3326 write_lock_bh(&idev->lock); 3327 } 3328 3329 write_unlock_bh(&idev->lock); 3330 3331 /* Step 5: Discard anycast and multicast list */ 3332 if (how) { 3333 ipv6_ac_destroy_dev(idev); 3334 ipv6_mc_destroy_dev(idev); 3335 } else { 3336 ipv6_mc_down(idev); 3337 } 3338 3339 idev->tstamp = jiffies; 3340 3341 /* Last: Shot the device (if unregistered) */ 3342 if (how) { 3343 addrconf_sysctl_unregister(idev); 3344 neigh_parms_release(&nd_tbl, idev->nd_parms); 3345 neigh_ifdown(&nd_tbl, dev); 3346 in6_dev_put(idev); 3347 } 3348 return 0; 3349 } 3350 3351 static void addrconf_rs_timer(unsigned long data) 3352 { 3353 struct inet6_dev *idev = (struct inet6_dev *)data; 3354 struct net_device *dev = idev->dev; 3355 struct in6_addr lladdr; 3356 3357 write_lock(&idev->lock); 3358 if (idev->dead || !(idev->if_flags & IF_READY)) 3359 goto out; 3360 3361 if (!ipv6_accept_ra(idev)) 3362 goto out; 3363 3364 /* Announcement received after solicitation was sent */ 3365 if (idev->if_flags & IF_RA_RCVD) 3366 goto out; 3367 3368 if (idev->rs_probes++ < idev->cnf.rtr_solicits) { 3369 write_unlock(&idev->lock); 3370 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE)) 3371 ndisc_send_rs(dev, &lladdr, 3372 &in6addr_linklocal_allrouters); 3373 else 3374 goto put; 3375 3376 write_lock(&idev->lock); 3377 /* The wait after the last probe can be shorter */ 3378 addrconf_mod_rs_timer(idev, (idev->rs_probes == 3379 idev->cnf.rtr_solicits) ? 3380 idev->cnf.rtr_solicit_delay : 3381 idev->cnf.rtr_solicit_interval); 3382 } else { 3383 /* 3384 * Note: we do not support deprecated "all on-link" 3385 * assumption any longer. 3386 */ 3387 pr_debug("%s: no IPv6 routers present\n", idev->dev->name); 3388 } 3389 3390 out: 3391 write_unlock(&idev->lock); 3392 put: 3393 in6_dev_put(idev); 3394 } 3395 3396 /* 3397 * Duplicate Address Detection 3398 */ 3399 static void addrconf_dad_kick(struct inet6_ifaddr *ifp) 3400 { 3401 unsigned long rand_num; 3402 struct inet6_dev *idev = ifp->idev; 3403 3404 if (ifp->flags & IFA_F_OPTIMISTIC) 3405 rand_num = 0; 3406 else 3407 rand_num = prandom_u32() % (idev->cnf.rtr_solicit_delay ? : 1); 3408 3409 ifp->dad_probes = idev->cnf.dad_transmits; 3410 addrconf_mod_dad_work(ifp, rand_num); 3411 } 3412 3413 static void addrconf_dad_begin(struct inet6_ifaddr *ifp) 3414 { 3415 struct inet6_dev *idev = ifp->idev; 3416 struct net_device *dev = idev->dev; 3417 3418 addrconf_join_solict(dev, &ifp->addr); 3419 3420 prandom_seed((__force u32) ifp->addr.s6_addr32[3]); 3421 3422 read_lock_bh(&idev->lock); 3423 spin_lock(&ifp->lock); 3424 if (ifp->state == INET6_IFADDR_STATE_DEAD) 3425 goto out; 3426 3427 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) || 3428 idev->cnf.accept_dad < 1 || 3429 !(ifp->flags&IFA_F_TENTATIVE) || 3430 ifp->flags & IFA_F_NODAD) { 3431 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED); 3432 spin_unlock(&ifp->lock); 3433 read_unlock_bh(&idev->lock); 3434 3435 addrconf_dad_completed(ifp); 3436 return; 3437 } 3438 3439 if (!(idev->if_flags & IF_READY)) { 3440 spin_unlock(&ifp->lock); 3441 read_unlock_bh(&idev->lock); 3442 /* 3443 * If the device is not ready: 3444 * - keep it tentative if it is a permanent address. 3445 * - otherwise, kill it. 3446 */ 3447 in6_ifa_hold(ifp); 3448 addrconf_dad_stop(ifp, 0); 3449 return; 3450 } 3451 3452 /* 3453 * Optimistic nodes can start receiving 3454 * Frames right away 3455 */ 3456 if (ifp->flags & IFA_F_OPTIMISTIC) { 3457 ip6_ins_rt(ifp->rt); 3458 if (ipv6_use_optimistic_addr(idev)) { 3459 /* Because optimistic nodes can use this address, 3460 * notify listeners. If DAD fails, RTM_DELADDR is sent. 3461 */ 3462 ipv6_ifa_notify(RTM_NEWADDR, ifp); 3463 } 3464 } 3465 3466 addrconf_dad_kick(ifp); 3467 out: 3468 spin_unlock(&ifp->lock); 3469 read_unlock_bh(&idev->lock); 3470 } 3471 3472 static void addrconf_dad_start(struct inet6_ifaddr *ifp) 3473 { 3474 bool begin_dad = false; 3475 3476 spin_lock_bh(&ifp->lock); 3477 if (ifp->state != INET6_IFADDR_STATE_DEAD) { 3478 ifp->state = INET6_IFADDR_STATE_PREDAD; 3479 begin_dad = true; 3480 } 3481 spin_unlock_bh(&ifp->lock); 3482 3483 if (begin_dad) 3484 addrconf_mod_dad_work(ifp, 0); 3485 } 3486 3487 static void addrconf_dad_work(struct work_struct *w) 3488 { 3489 struct inet6_ifaddr *ifp = container_of(to_delayed_work(w), 3490 struct inet6_ifaddr, 3491 dad_work); 3492 struct inet6_dev *idev = ifp->idev; 3493 struct in6_addr mcaddr; 3494 3495 enum { 3496 DAD_PROCESS, 3497 DAD_BEGIN, 3498 DAD_ABORT, 3499 } action = DAD_PROCESS; 3500 3501 rtnl_lock(); 3502 3503 spin_lock_bh(&ifp->lock); 3504 if (ifp->state == INET6_IFADDR_STATE_PREDAD) { 3505 action = DAD_BEGIN; 3506 ifp->state = INET6_IFADDR_STATE_DAD; 3507 } else if (ifp->state == INET6_IFADDR_STATE_ERRDAD) { 3508 action = DAD_ABORT; 3509 ifp->state = INET6_IFADDR_STATE_POSTDAD; 3510 } 3511 spin_unlock_bh(&ifp->lock); 3512 3513 if (action == DAD_BEGIN) { 3514 addrconf_dad_begin(ifp); 3515 goto out; 3516 } else if (action == DAD_ABORT) { 3517 addrconf_dad_stop(ifp, 1); 3518 goto out; 3519 } 3520 3521 if (!ifp->dad_probes && addrconf_dad_end(ifp)) 3522 goto out; 3523 3524 write_lock_bh(&idev->lock); 3525 if (idev->dead || !(idev->if_flags & IF_READY)) { 3526 write_unlock_bh(&idev->lock); 3527 goto out; 3528 } 3529 3530 spin_lock(&ifp->lock); 3531 if (ifp->state == INET6_IFADDR_STATE_DEAD) { 3532 spin_unlock(&ifp->lock); 3533 write_unlock_bh(&idev->lock); 3534 goto out; 3535 } 3536 3537 if (ifp->dad_probes == 0) { 3538 /* 3539 * DAD was successful 3540 */ 3541 3542 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED); 3543 spin_unlock(&ifp->lock); 3544 write_unlock_bh(&idev->lock); 3545 3546 addrconf_dad_completed(ifp); 3547 3548 goto out; 3549 } 3550 3551 ifp->dad_probes--; 3552 addrconf_mod_dad_work(ifp, 3553 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME)); 3554 spin_unlock(&ifp->lock); 3555 write_unlock_bh(&idev->lock); 3556 3557 /* send a neighbour solicitation for our addr */ 3558 addrconf_addr_solict_mult(&ifp->addr, &mcaddr); 3559 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &in6addr_any); 3560 out: 3561 in6_ifa_put(ifp); 3562 rtnl_unlock(); 3563 } 3564 3565 /* ifp->idev must be at least read locked */ 3566 static bool ipv6_lonely_lladdr(struct inet6_ifaddr *ifp) 3567 { 3568 struct inet6_ifaddr *ifpiter; 3569 struct inet6_dev *idev = ifp->idev; 3570 3571 list_for_each_entry_reverse(ifpiter, &idev->addr_list, if_list) { 3572 if (ifpiter->scope > IFA_LINK) 3573 break; 3574 if (ifp != ifpiter && ifpiter->scope == IFA_LINK && 3575 (ifpiter->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE| 3576 IFA_F_OPTIMISTIC|IFA_F_DADFAILED)) == 3577 IFA_F_PERMANENT) 3578 return false; 3579 } 3580 return true; 3581 } 3582 3583 static void addrconf_dad_completed(struct inet6_ifaddr *ifp) 3584 { 3585 struct net_device *dev = ifp->idev->dev; 3586 struct in6_addr lladdr; 3587 bool send_rs, send_mld; 3588 3589 addrconf_del_dad_work(ifp); 3590 3591 /* 3592 * Configure the address for reception. Now it is valid. 3593 */ 3594 3595 ipv6_ifa_notify(RTM_NEWADDR, ifp); 3596 3597 /* If added prefix is link local and we are prepared to process 3598 router advertisements, start sending router solicitations. 3599 */ 3600 3601 read_lock_bh(&ifp->idev->lock); 3602 send_mld = ifp->scope == IFA_LINK && ipv6_lonely_lladdr(ifp); 3603 send_rs = send_mld && 3604 ipv6_accept_ra(ifp->idev) && 3605 ifp->idev->cnf.rtr_solicits > 0 && 3606 (dev->flags&IFF_LOOPBACK) == 0; 3607 read_unlock_bh(&ifp->idev->lock); 3608 3609 /* While dad is in progress mld report's source address is in6_addrany. 3610 * Resend with proper ll now. 3611 */ 3612 if (send_mld) 3613 ipv6_mc_dad_complete(ifp->idev); 3614 3615 if (send_rs) { 3616 /* 3617 * If a host as already performed a random delay 3618 * [...] as part of DAD [...] there is no need 3619 * to delay again before sending the first RS 3620 */ 3621 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE)) 3622 return; 3623 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters); 3624 3625 write_lock_bh(&ifp->idev->lock); 3626 spin_lock(&ifp->lock); 3627 ifp->idev->rs_probes = 1; 3628 ifp->idev->if_flags |= IF_RS_SENT; 3629 addrconf_mod_rs_timer(ifp->idev, 3630 ifp->idev->cnf.rtr_solicit_interval); 3631 spin_unlock(&ifp->lock); 3632 write_unlock_bh(&ifp->idev->lock); 3633 } 3634 } 3635 3636 static void addrconf_dad_run(struct inet6_dev *idev) 3637 { 3638 struct inet6_ifaddr *ifp; 3639 3640 read_lock_bh(&idev->lock); 3641 list_for_each_entry(ifp, &idev->addr_list, if_list) { 3642 spin_lock(&ifp->lock); 3643 if (ifp->flags & IFA_F_TENTATIVE && 3644 ifp->state == INET6_IFADDR_STATE_DAD) 3645 addrconf_dad_kick(ifp); 3646 spin_unlock(&ifp->lock); 3647 } 3648 read_unlock_bh(&idev->lock); 3649 } 3650 3651 #ifdef CONFIG_PROC_FS 3652 struct if6_iter_state { 3653 struct seq_net_private p; 3654 int bucket; 3655 int offset; 3656 }; 3657 3658 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos) 3659 { 3660 struct inet6_ifaddr *ifa = NULL; 3661 struct if6_iter_state *state = seq->private; 3662 struct net *net = seq_file_net(seq); 3663 int p = 0; 3664 3665 /* initial bucket if pos is 0 */ 3666 if (pos == 0) { 3667 state->bucket = 0; 3668 state->offset = 0; 3669 } 3670 3671 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) { 3672 hlist_for_each_entry_rcu_bh(ifa, &inet6_addr_lst[state->bucket], 3673 addr_lst) { 3674 if (!net_eq(dev_net(ifa->idev->dev), net)) 3675 continue; 3676 /* sync with offset */ 3677 if (p < state->offset) { 3678 p++; 3679 continue; 3680 } 3681 state->offset++; 3682 return ifa; 3683 } 3684 3685 /* prepare for next bucket */ 3686 state->offset = 0; 3687 p = 0; 3688 } 3689 return NULL; 3690 } 3691 3692 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, 3693 struct inet6_ifaddr *ifa) 3694 { 3695 struct if6_iter_state *state = seq->private; 3696 struct net *net = seq_file_net(seq); 3697 3698 hlist_for_each_entry_continue_rcu_bh(ifa, addr_lst) { 3699 if (!net_eq(dev_net(ifa->idev->dev), net)) 3700 continue; 3701 state->offset++; 3702 return ifa; 3703 } 3704 3705 while (++state->bucket < IN6_ADDR_HSIZE) { 3706 state->offset = 0; 3707 hlist_for_each_entry_rcu_bh(ifa, 3708 &inet6_addr_lst[state->bucket], addr_lst) { 3709 if (!net_eq(dev_net(ifa->idev->dev), net)) 3710 continue; 3711 state->offset++; 3712 return ifa; 3713 } 3714 } 3715 3716 return NULL; 3717 } 3718 3719 static void *if6_seq_start(struct seq_file *seq, loff_t *pos) 3720 __acquires(rcu_bh) 3721 { 3722 rcu_read_lock_bh(); 3723 return if6_get_first(seq, *pos); 3724 } 3725 3726 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos) 3727 { 3728 struct inet6_ifaddr *ifa; 3729 3730 ifa = if6_get_next(seq, v); 3731 ++*pos; 3732 return ifa; 3733 } 3734 3735 static void if6_seq_stop(struct seq_file *seq, void *v) 3736 __releases(rcu_bh) 3737 { 3738 rcu_read_unlock_bh(); 3739 } 3740 3741 static int if6_seq_show(struct seq_file *seq, void *v) 3742 { 3743 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v; 3744 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n", 3745 &ifp->addr, 3746 ifp->idev->dev->ifindex, 3747 ifp->prefix_len, 3748 ifp->scope, 3749 (u8) ifp->flags, 3750 ifp->idev->dev->name); 3751 return 0; 3752 } 3753 3754 static const struct seq_operations if6_seq_ops = { 3755 .start = if6_seq_start, 3756 .next = if6_seq_next, 3757 .show = if6_seq_show, 3758 .stop = if6_seq_stop, 3759 }; 3760 3761 static int if6_seq_open(struct inode *inode, struct file *file) 3762 { 3763 return seq_open_net(inode, file, &if6_seq_ops, 3764 sizeof(struct if6_iter_state)); 3765 } 3766 3767 static const struct file_operations if6_fops = { 3768 .owner = THIS_MODULE, 3769 .open = if6_seq_open, 3770 .read = seq_read, 3771 .llseek = seq_lseek, 3772 .release = seq_release_net, 3773 }; 3774 3775 static int __net_init if6_proc_net_init(struct net *net) 3776 { 3777 if (!proc_create("if_inet6", S_IRUGO, net->proc_net, &if6_fops)) 3778 return -ENOMEM; 3779 return 0; 3780 } 3781 3782 static void __net_exit if6_proc_net_exit(struct net *net) 3783 { 3784 remove_proc_entry("if_inet6", net->proc_net); 3785 } 3786 3787 static struct pernet_operations if6_proc_net_ops = { 3788 .init = if6_proc_net_init, 3789 .exit = if6_proc_net_exit, 3790 }; 3791 3792 int __init if6_proc_init(void) 3793 { 3794 return register_pernet_subsys(&if6_proc_net_ops); 3795 } 3796 3797 void if6_proc_exit(void) 3798 { 3799 unregister_pernet_subsys(&if6_proc_net_ops); 3800 } 3801 #endif /* CONFIG_PROC_FS */ 3802 3803 #if IS_ENABLED(CONFIG_IPV6_MIP6) 3804 /* Check if address is a home address configured on any interface. */ 3805 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr) 3806 { 3807 int ret = 0; 3808 struct inet6_ifaddr *ifp = NULL; 3809 unsigned int hash = inet6_addr_hash(addr); 3810 3811 rcu_read_lock_bh(); 3812 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) { 3813 if (!net_eq(dev_net(ifp->idev->dev), net)) 3814 continue; 3815 if (ipv6_addr_equal(&ifp->addr, addr) && 3816 (ifp->flags & IFA_F_HOMEADDRESS)) { 3817 ret = 1; 3818 break; 3819 } 3820 } 3821 rcu_read_unlock_bh(); 3822 return ret; 3823 } 3824 #endif 3825 3826 /* 3827 * Periodic address status verification 3828 */ 3829 3830 static void addrconf_verify_rtnl(void) 3831 { 3832 unsigned long now, next, next_sec, next_sched; 3833 struct inet6_ifaddr *ifp; 3834 int i; 3835 3836 ASSERT_RTNL(); 3837 3838 rcu_read_lock_bh(); 3839 now = jiffies; 3840 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY); 3841 3842 cancel_delayed_work(&addr_chk_work); 3843 3844 for (i = 0; i < IN6_ADDR_HSIZE; i++) { 3845 restart: 3846 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[i], addr_lst) { 3847 unsigned long age; 3848 3849 /* When setting preferred_lft to a value not zero or 3850 * infinity, while valid_lft is infinity 3851 * IFA_F_PERMANENT has a non-infinity life time. 3852 */ 3853 if ((ifp->flags & IFA_F_PERMANENT) && 3854 (ifp->prefered_lft == INFINITY_LIFE_TIME)) 3855 continue; 3856 3857 spin_lock(&ifp->lock); 3858 /* We try to batch several events at once. */ 3859 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ; 3860 3861 if (ifp->valid_lft != INFINITY_LIFE_TIME && 3862 age >= ifp->valid_lft) { 3863 spin_unlock(&ifp->lock); 3864 in6_ifa_hold(ifp); 3865 ipv6_del_addr(ifp); 3866 goto restart; 3867 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) { 3868 spin_unlock(&ifp->lock); 3869 continue; 3870 } else if (age >= ifp->prefered_lft) { 3871 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */ 3872 int deprecate = 0; 3873 3874 if (!(ifp->flags&IFA_F_DEPRECATED)) { 3875 deprecate = 1; 3876 ifp->flags |= IFA_F_DEPRECATED; 3877 } 3878 3879 if ((ifp->valid_lft != INFINITY_LIFE_TIME) && 3880 (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))) 3881 next = ifp->tstamp + ifp->valid_lft * HZ; 3882 3883 spin_unlock(&ifp->lock); 3884 3885 if (deprecate) { 3886 in6_ifa_hold(ifp); 3887 3888 ipv6_ifa_notify(0, ifp); 3889 in6_ifa_put(ifp); 3890 goto restart; 3891 } 3892 } else if ((ifp->flags&IFA_F_TEMPORARY) && 3893 !(ifp->flags&IFA_F_TENTATIVE)) { 3894 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry * 3895 ifp->idev->cnf.dad_transmits * 3896 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME) / HZ; 3897 3898 if (age >= ifp->prefered_lft - regen_advance) { 3899 struct inet6_ifaddr *ifpub = ifp->ifpub; 3900 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 3901 next = ifp->tstamp + ifp->prefered_lft * HZ; 3902 if (!ifp->regen_count && ifpub) { 3903 ifp->regen_count++; 3904 in6_ifa_hold(ifp); 3905 in6_ifa_hold(ifpub); 3906 spin_unlock(&ifp->lock); 3907 3908 spin_lock(&ifpub->lock); 3909 ifpub->regen_count = 0; 3910 spin_unlock(&ifpub->lock); 3911 ipv6_create_tempaddr(ifpub, ifp); 3912 in6_ifa_put(ifpub); 3913 in6_ifa_put(ifp); 3914 goto restart; 3915 } 3916 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next)) 3917 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ; 3918 spin_unlock(&ifp->lock); 3919 } else { 3920 /* ifp->prefered_lft <= ifp->valid_lft */ 3921 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 3922 next = ifp->tstamp + ifp->prefered_lft * HZ; 3923 spin_unlock(&ifp->lock); 3924 } 3925 } 3926 } 3927 3928 next_sec = round_jiffies_up(next); 3929 next_sched = next; 3930 3931 /* If rounded timeout is accurate enough, accept it. */ 3932 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ)) 3933 next_sched = next_sec; 3934 3935 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */ 3936 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX)) 3937 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX; 3938 3939 ADBG(KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n", 3940 now, next, next_sec, next_sched); 3941 mod_delayed_work(addrconf_wq, &addr_chk_work, next_sched - now); 3942 rcu_read_unlock_bh(); 3943 } 3944 3945 static void addrconf_verify_work(struct work_struct *w) 3946 { 3947 rtnl_lock(); 3948 addrconf_verify_rtnl(); 3949 rtnl_unlock(); 3950 } 3951 3952 static void addrconf_verify(void) 3953 { 3954 mod_delayed_work(addrconf_wq, &addr_chk_work, 0); 3955 } 3956 3957 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local, 3958 struct in6_addr **peer_pfx) 3959 { 3960 struct in6_addr *pfx = NULL; 3961 3962 *peer_pfx = NULL; 3963 3964 if (addr) 3965 pfx = nla_data(addr); 3966 3967 if (local) { 3968 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx))) 3969 *peer_pfx = pfx; 3970 pfx = nla_data(local); 3971 } 3972 3973 return pfx; 3974 } 3975 3976 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = { 3977 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) }, 3978 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) }, 3979 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) }, 3980 [IFA_FLAGS] = { .len = sizeof(u32) }, 3981 }; 3982 3983 static int 3984 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh) 3985 { 3986 struct net *net = sock_net(skb->sk); 3987 struct ifaddrmsg *ifm; 3988 struct nlattr *tb[IFA_MAX+1]; 3989 struct in6_addr *pfx, *peer_pfx; 3990 u32 ifa_flags; 3991 int err; 3992 3993 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy); 3994 if (err < 0) 3995 return err; 3996 3997 ifm = nlmsg_data(nlh); 3998 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx); 3999 if (!pfx) 4000 return -EINVAL; 4001 4002 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags; 4003 4004 /* We ignore other flags so far. */ 4005 ifa_flags &= IFA_F_MANAGETEMPADDR; 4006 4007 return inet6_addr_del(net, ifm->ifa_index, ifa_flags, pfx, 4008 ifm->ifa_prefixlen); 4009 } 4010 4011 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u32 ifa_flags, 4012 u32 prefered_lft, u32 valid_lft) 4013 { 4014 u32 flags; 4015 clock_t expires; 4016 unsigned long timeout; 4017 bool was_managetempaddr; 4018 bool had_prefixroute; 4019 4020 ASSERT_RTNL(); 4021 4022 if (!valid_lft || (prefered_lft > valid_lft)) 4023 return -EINVAL; 4024 4025 if (ifa_flags & IFA_F_MANAGETEMPADDR && 4026 (ifp->flags & IFA_F_TEMPORARY || ifp->prefix_len != 64)) 4027 return -EINVAL; 4028 4029 timeout = addrconf_timeout_fixup(valid_lft, HZ); 4030 if (addrconf_finite_timeout(timeout)) { 4031 expires = jiffies_to_clock_t(timeout * HZ); 4032 valid_lft = timeout; 4033 flags = RTF_EXPIRES; 4034 } else { 4035 expires = 0; 4036 flags = 0; 4037 ifa_flags |= IFA_F_PERMANENT; 4038 } 4039 4040 timeout = addrconf_timeout_fixup(prefered_lft, HZ); 4041 if (addrconf_finite_timeout(timeout)) { 4042 if (timeout == 0) 4043 ifa_flags |= IFA_F_DEPRECATED; 4044 prefered_lft = timeout; 4045 } 4046 4047 spin_lock_bh(&ifp->lock); 4048 was_managetempaddr = ifp->flags & IFA_F_MANAGETEMPADDR; 4049 had_prefixroute = ifp->flags & IFA_F_PERMANENT && 4050 !(ifp->flags & IFA_F_NOPREFIXROUTE); 4051 ifp->flags &= ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | 4052 IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR | 4053 IFA_F_NOPREFIXROUTE); 4054 ifp->flags |= ifa_flags; 4055 ifp->tstamp = jiffies; 4056 ifp->valid_lft = valid_lft; 4057 ifp->prefered_lft = prefered_lft; 4058 4059 spin_unlock_bh(&ifp->lock); 4060 if (!(ifp->flags&IFA_F_TENTATIVE)) 4061 ipv6_ifa_notify(0, ifp); 4062 4063 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) { 4064 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev, 4065 expires, flags); 4066 } else if (had_prefixroute) { 4067 enum cleanup_prefix_rt_t action; 4068 unsigned long rt_expires; 4069 4070 write_lock_bh(&ifp->idev->lock); 4071 action = check_cleanup_prefix_route(ifp, &rt_expires); 4072 write_unlock_bh(&ifp->idev->lock); 4073 4074 if (action != CLEANUP_PREFIX_RT_NOP) { 4075 cleanup_prefix_route(ifp, rt_expires, 4076 action == CLEANUP_PREFIX_RT_DEL); 4077 } 4078 } 4079 4080 if (was_managetempaddr || ifp->flags & IFA_F_MANAGETEMPADDR) { 4081 if (was_managetempaddr && !(ifp->flags & IFA_F_MANAGETEMPADDR)) 4082 valid_lft = prefered_lft = 0; 4083 manage_tempaddrs(ifp->idev, ifp, valid_lft, prefered_lft, 4084 !was_managetempaddr, jiffies); 4085 } 4086 4087 addrconf_verify_rtnl(); 4088 4089 return 0; 4090 } 4091 4092 static int 4093 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh) 4094 { 4095 struct net *net = sock_net(skb->sk); 4096 struct ifaddrmsg *ifm; 4097 struct nlattr *tb[IFA_MAX+1]; 4098 struct in6_addr *pfx, *peer_pfx; 4099 struct inet6_ifaddr *ifa; 4100 struct net_device *dev; 4101 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME; 4102 u32 ifa_flags; 4103 int err; 4104 4105 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy); 4106 if (err < 0) 4107 return err; 4108 4109 ifm = nlmsg_data(nlh); 4110 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx); 4111 if (!pfx) 4112 return -EINVAL; 4113 4114 if (tb[IFA_CACHEINFO]) { 4115 struct ifa_cacheinfo *ci; 4116 4117 ci = nla_data(tb[IFA_CACHEINFO]); 4118 valid_lft = ci->ifa_valid; 4119 preferred_lft = ci->ifa_prefered; 4120 } else { 4121 preferred_lft = INFINITY_LIFE_TIME; 4122 valid_lft = INFINITY_LIFE_TIME; 4123 } 4124 4125 dev = __dev_get_by_index(net, ifm->ifa_index); 4126 if (!dev) 4127 return -ENODEV; 4128 4129 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags; 4130 4131 /* We ignore other flags so far. */ 4132 ifa_flags &= IFA_F_NODAD | IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR | 4133 IFA_F_NOPREFIXROUTE | IFA_F_MCAUTOJOIN; 4134 4135 ifa = ipv6_get_ifaddr(net, pfx, dev, 1); 4136 if (!ifa) { 4137 /* 4138 * It would be best to check for !NLM_F_CREATE here but 4139 * userspace already relies on not having to provide this. 4140 */ 4141 return inet6_addr_add(net, ifm->ifa_index, pfx, peer_pfx, 4142 ifm->ifa_prefixlen, ifa_flags, 4143 preferred_lft, valid_lft); 4144 } 4145 4146 if (nlh->nlmsg_flags & NLM_F_EXCL || 4147 !(nlh->nlmsg_flags & NLM_F_REPLACE)) 4148 err = -EEXIST; 4149 else 4150 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft); 4151 4152 in6_ifa_put(ifa); 4153 4154 return err; 4155 } 4156 4157 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u32 flags, 4158 u8 scope, int ifindex) 4159 { 4160 struct ifaddrmsg *ifm; 4161 4162 ifm = nlmsg_data(nlh); 4163 ifm->ifa_family = AF_INET6; 4164 ifm->ifa_prefixlen = prefixlen; 4165 ifm->ifa_flags = flags; 4166 ifm->ifa_scope = scope; 4167 ifm->ifa_index = ifindex; 4168 } 4169 4170 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp, 4171 unsigned long tstamp, u32 preferred, u32 valid) 4172 { 4173 struct ifa_cacheinfo ci; 4174 4175 ci.cstamp = cstamp_delta(cstamp); 4176 ci.tstamp = cstamp_delta(tstamp); 4177 ci.ifa_prefered = preferred; 4178 ci.ifa_valid = valid; 4179 4180 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci); 4181 } 4182 4183 static inline int rt_scope(int ifa_scope) 4184 { 4185 if (ifa_scope & IFA_HOST) 4186 return RT_SCOPE_HOST; 4187 else if (ifa_scope & IFA_LINK) 4188 return RT_SCOPE_LINK; 4189 else if (ifa_scope & IFA_SITE) 4190 return RT_SCOPE_SITE; 4191 else 4192 return RT_SCOPE_UNIVERSE; 4193 } 4194 4195 static inline int inet6_ifaddr_msgsize(void) 4196 { 4197 return NLMSG_ALIGN(sizeof(struct ifaddrmsg)) 4198 + nla_total_size(16) /* IFA_LOCAL */ 4199 + nla_total_size(16) /* IFA_ADDRESS */ 4200 + nla_total_size(sizeof(struct ifa_cacheinfo)) 4201 + nla_total_size(4) /* IFA_FLAGS */; 4202 } 4203 4204 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa, 4205 u32 portid, u32 seq, int event, unsigned int flags) 4206 { 4207 struct nlmsghdr *nlh; 4208 u32 preferred, valid; 4209 4210 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags); 4211 if (!nlh) 4212 return -EMSGSIZE; 4213 4214 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope), 4215 ifa->idev->dev->ifindex); 4216 4217 if (!((ifa->flags&IFA_F_PERMANENT) && 4218 (ifa->prefered_lft == INFINITY_LIFE_TIME))) { 4219 preferred = ifa->prefered_lft; 4220 valid = ifa->valid_lft; 4221 if (preferred != INFINITY_LIFE_TIME) { 4222 long tval = (jiffies - ifa->tstamp)/HZ; 4223 if (preferred > tval) 4224 preferred -= tval; 4225 else 4226 preferred = 0; 4227 if (valid != INFINITY_LIFE_TIME) { 4228 if (valid > tval) 4229 valid -= tval; 4230 else 4231 valid = 0; 4232 } 4233 } 4234 } else { 4235 preferred = INFINITY_LIFE_TIME; 4236 valid = INFINITY_LIFE_TIME; 4237 } 4238 4239 if (!ipv6_addr_any(&ifa->peer_addr)) { 4240 if (nla_put_in6_addr(skb, IFA_LOCAL, &ifa->addr) < 0 || 4241 nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->peer_addr) < 0) 4242 goto error; 4243 } else 4244 if (nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->addr) < 0) 4245 goto error; 4246 4247 if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) 4248 goto error; 4249 4250 if (nla_put_u32(skb, IFA_FLAGS, ifa->flags) < 0) 4251 goto error; 4252 4253 nlmsg_end(skb, nlh); 4254 return 0; 4255 4256 error: 4257 nlmsg_cancel(skb, nlh); 4258 return -EMSGSIZE; 4259 } 4260 4261 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca, 4262 u32 portid, u32 seq, int event, u16 flags) 4263 { 4264 struct nlmsghdr *nlh; 4265 u8 scope = RT_SCOPE_UNIVERSE; 4266 int ifindex = ifmca->idev->dev->ifindex; 4267 4268 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE) 4269 scope = RT_SCOPE_SITE; 4270 4271 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags); 4272 if (!nlh) 4273 return -EMSGSIZE; 4274 4275 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 4276 if (nla_put_in6_addr(skb, IFA_MULTICAST, &ifmca->mca_addr) < 0 || 4277 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp, 4278 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 4279 nlmsg_cancel(skb, nlh); 4280 return -EMSGSIZE; 4281 } 4282 4283 nlmsg_end(skb, nlh); 4284 return 0; 4285 } 4286 4287 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca, 4288 u32 portid, u32 seq, int event, unsigned int flags) 4289 { 4290 struct nlmsghdr *nlh; 4291 u8 scope = RT_SCOPE_UNIVERSE; 4292 int ifindex = ifaca->aca_idev->dev->ifindex; 4293 4294 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE) 4295 scope = RT_SCOPE_SITE; 4296 4297 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags); 4298 if (!nlh) 4299 return -EMSGSIZE; 4300 4301 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 4302 if (nla_put_in6_addr(skb, IFA_ANYCAST, &ifaca->aca_addr) < 0 || 4303 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp, 4304 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 4305 nlmsg_cancel(skb, nlh); 4306 return -EMSGSIZE; 4307 } 4308 4309 nlmsg_end(skb, nlh); 4310 return 0; 4311 } 4312 4313 enum addr_type_t { 4314 UNICAST_ADDR, 4315 MULTICAST_ADDR, 4316 ANYCAST_ADDR, 4317 }; 4318 4319 /* called with rcu_read_lock() */ 4320 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb, 4321 struct netlink_callback *cb, enum addr_type_t type, 4322 int s_ip_idx, int *p_ip_idx) 4323 { 4324 struct ifmcaddr6 *ifmca; 4325 struct ifacaddr6 *ifaca; 4326 int err = 1; 4327 int ip_idx = *p_ip_idx; 4328 4329 read_lock_bh(&idev->lock); 4330 switch (type) { 4331 case UNICAST_ADDR: { 4332 struct inet6_ifaddr *ifa; 4333 4334 /* unicast address incl. temp addr */ 4335 list_for_each_entry(ifa, &idev->addr_list, if_list) { 4336 if (++ip_idx < s_ip_idx) 4337 continue; 4338 err = inet6_fill_ifaddr(skb, ifa, 4339 NETLINK_CB(cb->skb).portid, 4340 cb->nlh->nlmsg_seq, 4341 RTM_NEWADDR, 4342 NLM_F_MULTI); 4343 if (err < 0) 4344 break; 4345 nl_dump_check_consistent(cb, nlmsg_hdr(skb)); 4346 } 4347 break; 4348 } 4349 case MULTICAST_ADDR: 4350 /* multicast address */ 4351 for (ifmca = idev->mc_list; ifmca; 4352 ifmca = ifmca->next, ip_idx++) { 4353 if (ip_idx < s_ip_idx) 4354 continue; 4355 err = inet6_fill_ifmcaddr(skb, ifmca, 4356 NETLINK_CB(cb->skb).portid, 4357 cb->nlh->nlmsg_seq, 4358 RTM_GETMULTICAST, 4359 NLM_F_MULTI); 4360 if (err < 0) 4361 break; 4362 } 4363 break; 4364 case ANYCAST_ADDR: 4365 /* anycast address */ 4366 for (ifaca = idev->ac_list; ifaca; 4367 ifaca = ifaca->aca_next, ip_idx++) { 4368 if (ip_idx < s_ip_idx) 4369 continue; 4370 err = inet6_fill_ifacaddr(skb, ifaca, 4371 NETLINK_CB(cb->skb).portid, 4372 cb->nlh->nlmsg_seq, 4373 RTM_GETANYCAST, 4374 NLM_F_MULTI); 4375 if (err < 0) 4376 break; 4377 } 4378 break; 4379 default: 4380 break; 4381 } 4382 read_unlock_bh(&idev->lock); 4383 *p_ip_idx = ip_idx; 4384 return err; 4385 } 4386 4387 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb, 4388 enum addr_type_t type) 4389 { 4390 struct net *net = sock_net(skb->sk); 4391 int h, s_h; 4392 int idx, ip_idx; 4393 int s_idx, s_ip_idx; 4394 struct net_device *dev; 4395 struct inet6_dev *idev; 4396 struct hlist_head *head; 4397 4398 s_h = cb->args[0]; 4399 s_idx = idx = cb->args[1]; 4400 s_ip_idx = ip_idx = cb->args[2]; 4401 4402 rcu_read_lock(); 4403 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ net->dev_base_seq; 4404 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 4405 idx = 0; 4406 head = &net->dev_index_head[h]; 4407 hlist_for_each_entry_rcu(dev, head, index_hlist) { 4408 if (idx < s_idx) 4409 goto cont; 4410 if (h > s_h || idx > s_idx) 4411 s_ip_idx = 0; 4412 ip_idx = 0; 4413 idev = __in6_dev_get(dev); 4414 if (!idev) 4415 goto cont; 4416 4417 if (in6_dump_addrs(idev, skb, cb, type, 4418 s_ip_idx, &ip_idx) < 0) 4419 goto done; 4420 cont: 4421 idx++; 4422 } 4423 } 4424 done: 4425 rcu_read_unlock(); 4426 cb->args[0] = h; 4427 cb->args[1] = idx; 4428 cb->args[2] = ip_idx; 4429 4430 return skb->len; 4431 } 4432 4433 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb) 4434 { 4435 enum addr_type_t type = UNICAST_ADDR; 4436 4437 return inet6_dump_addr(skb, cb, type); 4438 } 4439 4440 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb) 4441 { 4442 enum addr_type_t type = MULTICAST_ADDR; 4443 4444 return inet6_dump_addr(skb, cb, type); 4445 } 4446 4447 4448 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb) 4449 { 4450 enum addr_type_t type = ANYCAST_ADDR; 4451 4452 return inet6_dump_addr(skb, cb, type); 4453 } 4454 4455 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh) 4456 { 4457 struct net *net = sock_net(in_skb->sk); 4458 struct ifaddrmsg *ifm; 4459 struct nlattr *tb[IFA_MAX+1]; 4460 struct in6_addr *addr = NULL, *peer; 4461 struct net_device *dev = NULL; 4462 struct inet6_ifaddr *ifa; 4463 struct sk_buff *skb; 4464 int err; 4465 4466 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy); 4467 if (err < 0) 4468 goto errout; 4469 4470 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer); 4471 if (!addr) { 4472 err = -EINVAL; 4473 goto errout; 4474 } 4475 4476 ifm = nlmsg_data(nlh); 4477 if (ifm->ifa_index) 4478 dev = __dev_get_by_index(net, ifm->ifa_index); 4479 4480 ifa = ipv6_get_ifaddr(net, addr, dev, 1); 4481 if (!ifa) { 4482 err = -EADDRNOTAVAIL; 4483 goto errout; 4484 } 4485 4486 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL); 4487 if (!skb) { 4488 err = -ENOBUFS; 4489 goto errout_ifa; 4490 } 4491 4492 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).portid, 4493 nlh->nlmsg_seq, RTM_NEWADDR, 0); 4494 if (err < 0) { 4495 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 4496 WARN_ON(err == -EMSGSIZE); 4497 kfree_skb(skb); 4498 goto errout_ifa; 4499 } 4500 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid); 4501 errout_ifa: 4502 in6_ifa_put(ifa); 4503 errout: 4504 return err; 4505 } 4506 4507 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa) 4508 { 4509 struct sk_buff *skb; 4510 struct net *net = dev_net(ifa->idev->dev); 4511 int err = -ENOBUFS; 4512 4513 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC); 4514 if (!skb) 4515 goto errout; 4516 4517 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0); 4518 if (err < 0) { 4519 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 4520 WARN_ON(err == -EMSGSIZE); 4521 kfree_skb(skb); 4522 goto errout; 4523 } 4524 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC); 4525 return; 4526 errout: 4527 if (err < 0) 4528 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err); 4529 } 4530 4531 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf, 4532 __s32 *array, int bytes) 4533 { 4534 BUG_ON(bytes < (DEVCONF_MAX * 4)); 4535 4536 memset(array, 0, bytes); 4537 array[DEVCONF_FORWARDING] = cnf->forwarding; 4538 array[DEVCONF_HOPLIMIT] = cnf->hop_limit; 4539 array[DEVCONF_MTU6] = cnf->mtu6; 4540 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra; 4541 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects; 4542 array[DEVCONF_AUTOCONF] = cnf->autoconf; 4543 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits; 4544 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits; 4545 array[DEVCONF_RTR_SOLICIT_INTERVAL] = 4546 jiffies_to_msecs(cnf->rtr_solicit_interval); 4547 array[DEVCONF_RTR_SOLICIT_DELAY] = 4548 jiffies_to_msecs(cnf->rtr_solicit_delay); 4549 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version; 4550 array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] = 4551 jiffies_to_msecs(cnf->mldv1_unsolicited_report_interval); 4552 array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] = 4553 jiffies_to_msecs(cnf->mldv2_unsolicited_report_interval); 4554 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr; 4555 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft; 4556 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft; 4557 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry; 4558 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor; 4559 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses; 4560 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr; 4561 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo; 4562 #ifdef CONFIG_IPV6_ROUTER_PREF 4563 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref; 4564 array[DEVCONF_RTR_PROBE_INTERVAL] = 4565 jiffies_to_msecs(cnf->rtr_probe_interval); 4566 #ifdef CONFIG_IPV6_ROUTE_INFO 4567 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen; 4568 #endif 4569 #endif 4570 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp; 4571 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route; 4572 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 4573 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad; 4574 array[DEVCONF_USE_OPTIMISTIC] = cnf->use_optimistic; 4575 #endif 4576 #ifdef CONFIG_IPV6_MROUTE 4577 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding; 4578 #endif 4579 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6; 4580 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad; 4581 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao; 4582 array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify; 4583 array[DEVCONF_SUPPRESS_FRAG_NDISC] = cnf->suppress_frag_ndisc; 4584 array[DEVCONF_ACCEPT_RA_FROM_LOCAL] = cnf->accept_ra_from_local; 4585 array[DEVCONF_ACCEPT_RA_MTU] = cnf->accept_ra_mtu; 4586 /* we omit DEVCONF_STABLE_SECRET for now */ 4587 } 4588 4589 static inline size_t inet6_ifla6_size(void) 4590 { 4591 return nla_total_size(4) /* IFLA_INET6_FLAGS */ 4592 + nla_total_size(sizeof(struct ifla_cacheinfo)) 4593 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */ 4594 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */ 4595 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */ 4596 + nla_total_size(sizeof(struct in6_addr)); /* IFLA_INET6_TOKEN */ 4597 } 4598 4599 static inline size_t inet6_if_nlmsg_size(void) 4600 { 4601 return NLMSG_ALIGN(sizeof(struct ifinfomsg)) 4602 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */ 4603 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */ 4604 + nla_total_size(4) /* IFLA_MTU */ 4605 + nla_total_size(4) /* IFLA_LINK */ 4606 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */ 4607 } 4608 4609 static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib, 4610 int items, int bytes) 4611 { 4612 int i; 4613 int pad = bytes - sizeof(u64) * items; 4614 BUG_ON(pad < 0); 4615 4616 /* Use put_unaligned() because stats may not be aligned for u64. */ 4617 put_unaligned(items, &stats[0]); 4618 for (i = 1; i < items; i++) 4619 put_unaligned(atomic_long_read(&mib[i]), &stats[i]); 4620 4621 memset(&stats[items], 0, pad); 4622 } 4623 4624 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu *mib, 4625 int items, int bytes, size_t syncpoff) 4626 { 4627 int i; 4628 int pad = bytes - sizeof(u64) * items; 4629 BUG_ON(pad < 0); 4630 4631 /* Use put_unaligned() because stats may not be aligned for u64. */ 4632 put_unaligned(items, &stats[0]); 4633 for (i = 1; i < items; i++) 4634 put_unaligned(snmp_fold_field64(mib, i, syncpoff), &stats[i]); 4635 4636 memset(&stats[items], 0, pad); 4637 } 4638 4639 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype, 4640 int bytes) 4641 { 4642 switch (attrtype) { 4643 case IFLA_INET6_STATS: 4644 __snmp6_fill_stats64(stats, idev->stats.ipv6, 4645 IPSTATS_MIB_MAX, bytes, offsetof(struct ipstats_mib, syncp)); 4646 break; 4647 case IFLA_INET6_ICMP6STATS: 4648 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, ICMP6_MIB_MAX, bytes); 4649 break; 4650 } 4651 } 4652 4653 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev) 4654 { 4655 struct nlattr *nla; 4656 struct ifla_cacheinfo ci; 4657 4658 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags)) 4659 goto nla_put_failure; 4660 ci.max_reasm_len = IPV6_MAXPLEN; 4661 ci.tstamp = cstamp_delta(idev->tstamp); 4662 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time); 4663 ci.retrans_time = jiffies_to_msecs(NEIGH_VAR(idev->nd_parms, RETRANS_TIME)); 4664 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci)) 4665 goto nla_put_failure; 4666 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32)); 4667 if (!nla) 4668 goto nla_put_failure; 4669 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla)); 4670 4671 /* XXX - MC not implemented */ 4672 4673 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64)); 4674 if (!nla) 4675 goto nla_put_failure; 4676 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla)); 4677 4678 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64)); 4679 if (!nla) 4680 goto nla_put_failure; 4681 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla)); 4682 4683 nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr)); 4684 if (!nla) 4685 goto nla_put_failure; 4686 4687 if (nla_put_u8(skb, IFLA_INET6_ADDR_GEN_MODE, idev->addr_gen_mode)) 4688 goto nla_put_failure; 4689 4690 read_lock_bh(&idev->lock); 4691 memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla)); 4692 read_unlock_bh(&idev->lock); 4693 4694 return 0; 4695 4696 nla_put_failure: 4697 return -EMSGSIZE; 4698 } 4699 4700 static size_t inet6_get_link_af_size(const struct net_device *dev) 4701 { 4702 if (!__in6_dev_get(dev)) 4703 return 0; 4704 4705 return inet6_ifla6_size(); 4706 } 4707 4708 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev) 4709 { 4710 struct inet6_dev *idev = __in6_dev_get(dev); 4711 4712 if (!idev) 4713 return -ENODATA; 4714 4715 if (inet6_fill_ifla6_attrs(skb, idev) < 0) 4716 return -EMSGSIZE; 4717 4718 return 0; 4719 } 4720 4721 static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token) 4722 { 4723 struct inet6_ifaddr *ifp; 4724 struct net_device *dev = idev->dev; 4725 bool update_rs = false; 4726 struct in6_addr ll_addr; 4727 4728 ASSERT_RTNL(); 4729 4730 if (!token) 4731 return -EINVAL; 4732 if (ipv6_addr_any(token)) 4733 return -EINVAL; 4734 if (dev->flags & (IFF_LOOPBACK | IFF_NOARP)) 4735 return -EINVAL; 4736 if (!ipv6_accept_ra(idev)) 4737 return -EINVAL; 4738 if (idev->cnf.rtr_solicits <= 0) 4739 return -EINVAL; 4740 4741 write_lock_bh(&idev->lock); 4742 4743 BUILD_BUG_ON(sizeof(token->s6_addr) != 16); 4744 memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8); 4745 4746 write_unlock_bh(&idev->lock); 4747 4748 if (!idev->dead && (idev->if_flags & IF_READY) && 4749 !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE | 4750 IFA_F_OPTIMISTIC)) { 4751 4752 /* If we're not ready, then normal ifup will take care 4753 * of this. Otherwise, we need to request our rs here. 4754 */ 4755 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters); 4756 update_rs = true; 4757 } 4758 4759 write_lock_bh(&idev->lock); 4760 4761 if (update_rs) { 4762 idev->if_flags |= IF_RS_SENT; 4763 idev->rs_probes = 1; 4764 addrconf_mod_rs_timer(idev, idev->cnf.rtr_solicit_interval); 4765 } 4766 4767 /* Well, that's kinda nasty ... */ 4768 list_for_each_entry(ifp, &idev->addr_list, if_list) { 4769 spin_lock(&ifp->lock); 4770 if (ifp->tokenized) { 4771 ifp->valid_lft = 0; 4772 ifp->prefered_lft = 0; 4773 } 4774 spin_unlock(&ifp->lock); 4775 } 4776 4777 write_unlock_bh(&idev->lock); 4778 inet6_ifinfo_notify(RTM_NEWLINK, idev); 4779 addrconf_verify_rtnl(); 4780 return 0; 4781 } 4782 4783 static const struct nla_policy inet6_af_policy[IFLA_INET6_MAX + 1] = { 4784 [IFLA_INET6_ADDR_GEN_MODE] = { .type = NLA_U8 }, 4785 [IFLA_INET6_TOKEN] = { .len = sizeof(struct in6_addr) }, 4786 }; 4787 4788 static int inet6_validate_link_af(const struct net_device *dev, 4789 const struct nlattr *nla) 4790 { 4791 struct nlattr *tb[IFLA_INET6_MAX + 1]; 4792 4793 if (dev && !__in6_dev_get(dev)) 4794 return -EAFNOSUPPORT; 4795 4796 return nla_parse_nested(tb, IFLA_INET6_MAX, nla, inet6_af_policy); 4797 } 4798 4799 static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla) 4800 { 4801 int err = -EINVAL; 4802 struct inet6_dev *idev = __in6_dev_get(dev); 4803 struct nlattr *tb[IFLA_INET6_MAX + 1]; 4804 4805 if (!idev) 4806 return -EAFNOSUPPORT; 4807 4808 if (nla_parse_nested(tb, IFLA_INET6_MAX, nla, NULL) < 0) 4809 BUG(); 4810 4811 if (tb[IFLA_INET6_TOKEN]) { 4812 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN])); 4813 if (err) 4814 return err; 4815 } 4816 4817 if (tb[IFLA_INET6_ADDR_GEN_MODE]) { 4818 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]); 4819 4820 if (mode != IN6_ADDR_GEN_MODE_EUI64 && 4821 mode != IN6_ADDR_GEN_MODE_NONE && 4822 mode != IN6_ADDR_GEN_MODE_STABLE_PRIVACY) 4823 return -EINVAL; 4824 4825 if (mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY && 4826 !idev->cnf.stable_secret.initialized && 4827 !dev_net(dev)->ipv6.devconf_dflt->stable_secret.initialized) 4828 return -EINVAL; 4829 4830 idev->addr_gen_mode = mode; 4831 err = 0; 4832 } 4833 4834 return err; 4835 } 4836 4837 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev, 4838 u32 portid, u32 seq, int event, unsigned int flags) 4839 { 4840 struct net_device *dev = idev->dev; 4841 struct ifinfomsg *hdr; 4842 struct nlmsghdr *nlh; 4843 void *protoinfo; 4844 4845 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags); 4846 if (!nlh) 4847 return -EMSGSIZE; 4848 4849 hdr = nlmsg_data(nlh); 4850 hdr->ifi_family = AF_INET6; 4851 hdr->__ifi_pad = 0; 4852 hdr->ifi_type = dev->type; 4853 hdr->ifi_index = dev->ifindex; 4854 hdr->ifi_flags = dev_get_flags(dev); 4855 hdr->ifi_change = 0; 4856 4857 if (nla_put_string(skb, IFLA_IFNAME, dev->name) || 4858 (dev->addr_len && 4859 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) || 4860 nla_put_u32(skb, IFLA_MTU, dev->mtu) || 4861 (dev->ifindex != dev_get_iflink(dev) && 4862 nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev)))) 4863 goto nla_put_failure; 4864 protoinfo = nla_nest_start(skb, IFLA_PROTINFO); 4865 if (!protoinfo) 4866 goto nla_put_failure; 4867 4868 if (inet6_fill_ifla6_attrs(skb, idev) < 0) 4869 goto nla_put_failure; 4870 4871 nla_nest_end(skb, protoinfo); 4872 nlmsg_end(skb, nlh); 4873 return 0; 4874 4875 nla_put_failure: 4876 nlmsg_cancel(skb, nlh); 4877 return -EMSGSIZE; 4878 } 4879 4880 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb) 4881 { 4882 struct net *net = sock_net(skb->sk); 4883 int h, s_h; 4884 int idx = 0, s_idx; 4885 struct net_device *dev; 4886 struct inet6_dev *idev; 4887 struct hlist_head *head; 4888 4889 s_h = cb->args[0]; 4890 s_idx = cb->args[1]; 4891 4892 rcu_read_lock(); 4893 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 4894 idx = 0; 4895 head = &net->dev_index_head[h]; 4896 hlist_for_each_entry_rcu(dev, head, index_hlist) { 4897 if (idx < s_idx) 4898 goto cont; 4899 idev = __in6_dev_get(dev); 4900 if (!idev) 4901 goto cont; 4902 if (inet6_fill_ifinfo(skb, idev, 4903 NETLINK_CB(cb->skb).portid, 4904 cb->nlh->nlmsg_seq, 4905 RTM_NEWLINK, NLM_F_MULTI) < 0) 4906 goto out; 4907 cont: 4908 idx++; 4909 } 4910 } 4911 out: 4912 rcu_read_unlock(); 4913 cb->args[1] = idx; 4914 cb->args[0] = h; 4915 4916 return skb->len; 4917 } 4918 4919 void inet6_ifinfo_notify(int event, struct inet6_dev *idev) 4920 { 4921 struct sk_buff *skb; 4922 struct net *net = dev_net(idev->dev); 4923 int err = -ENOBUFS; 4924 4925 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC); 4926 if (!skb) 4927 goto errout; 4928 4929 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0); 4930 if (err < 0) { 4931 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */ 4932 WARN_ON(err == -EMSGSIZE); 4933 kfree_skb(skb); 4934 goto errout; 4935 } 4936 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC); 4937 return; 4938 errout: 4939 if (err < 0) 4940 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err); 4941 } 4942 4943 static inline size_t inet6_prefix_nlmsg_size(void) 4944 { 4945 return NLMSG_ALIGN(sizeof(struct prefixmsg)) 4946 + nla_total_size(sizeof(struct in6_addr)) 4947 + nla_total_size(sizeof(struct prefix_cacheinfo)); 4948 } 4949 4950 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev, 4951 struct prefix_info *pinfo, u32 portid, u32 seq, 4952 int event, unsigned int flags) 4953 { 4954 struct prefixmsg *pmsg; 4955 struct nlmsghdr *nlh; 4956 struct prefix_cacheinfo ci; 4957 4958 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags); 4959 if (!nlh) 4960 return -EMSGSIZE; 4961 4962 pmsg = nlmsg_data(nlh); 4963 pmsg->prefix_family = AF_INET6; 4964 pmsg->prefix_pad1 = 0; 4965 pmsg->prefix_pad2 = 0; 4966 pmsg->prefix_ifindex = idev->dev->ifindex; 4967 pmsg->prefix_len = pinfo->prefix_len; 4968 pmsg->prefix_type = pinfo->type; 4969 pmsg->prefix_pad3 = 0; 4970 pmsg->prefix_flags = 0; 4971 if (pinfo->onlink) 4972 pmsg->prefix_flags |= IF_PREFIX_ONLINK; 4973 if (pinfo->autoconf) 4974 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF; 4975 4976 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix)) 4977 goto nla_put_failure; 4978 ci.preferred_time = ntohl(pinfo->prefered); 4979 ci.valid_time = ntohl(pinfo->valid); 4980 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci)) 4981 goto nla_put_failure; 4982 nlmsg_end(skb, nlh); 4983 return 0; 4984 4985 nla_put_failure: 4986 nlmsg_cancel(skb, nlh); 4987 return -EMSGSIZE; 4988 } 4989 4990 static void inet6_prefix_notify(int event, struct inet6_dev *idev, 4991 struct prefix_info *pinfo) 4992 { 4993 struct sk_buff *skb; 4994 struct net *net = dev_net(idev->dev); 4995 int err = -ENOBUFS; 4996 4997 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC); 4998 if (!skb) 4999 goto errout; 5000 5001 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0); 5002 if (err < 0) { 5003 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */ 5004 WARN_ON(err == -EMSGSIZE); 5005 kfree_skb(skb); 5006 goto errout; 5007 } 5008 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC); 5009 return; 5010 errout: 5011 if (err < 0) 5012 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err); 5013 } 5014 5015 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 5016 { 5017 struct net *net = dev_net(ifp->idev->dev); 5018 5019 if (event) 5020 ASSERT_RTNL(); 5021 5022 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp); 5023 5024 switch (event) { 5025 case RTM_NEWADDR: 5026 /* 5027 * If the address was optimistic 5028 * we inserted the route at the start of 5029 * our DAD process, so we don't need 5030 * to do it again 5031 */ 5032 if (!(ifp->rt->rt6i_node)) 5033 ip6_ins_rt(ifp->rt); 5034 if (ifp->idev->cnf.forwarding) 5035 addrconf_join_anycast(ifp); 5036 if (!ipv6_addr_any(&ifp->peer_addr)) 5037 addrconf_prefix_route(&ifp->peer_addr, 128, 5038 ifp->idev->dev, 0, 0); 5039 break; 5040 case RTM_DELADDR: 5041 if (ifp->idev->cnf.forwarding) 5042 addrconf_leave_anycast(ifp); 5043 addrconf_leave_solict(ifp->idev, &ifp->addr); 5044 if (!ipv6_addr_any(&ifp->peer_addr)) { 5045 struct rt6_info *rt; 5046 5047 rt = addrconf_get_prefix_route(&ifp->peer_addr, 128, 5048 ifp->idev->dev, 0, 0); 5049 if (rt && ip6_del_rt(rt)) 5050 dst_free(&rt->dst); 5051 } 5052 dst_hold(&ifp->rt->dst); 5053 5054 if (ip6_del_rt(ifp->rt)) 5055 dst_free(&ifp->rt->dst); 5056 5057 rt_genid_bump_ipv6(net); 5058 break; 5059 } 5060 atomic_inc(&net->ipv6.dev_addr_genid); 5061 } 5062 5063 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 5064 { 5065 rcu_read_lock_bh(); 5066 if (likely(ifp->idev->dead == 0)) 5067 __ipv6_ifa_notify(event, ifp); 5068 rcu_read_unlock_bh(); 5069 } 5070 5071 #ifdef CONFIG_SYSCTL 5072 5073 static 5074 int addrconf_sysctl_forward(struct ctl_table *ctl, int write, 5075 void __user *buffer, size_t *lenp, loff_t *ppos) 5076 { 5077 int *valp = ctl->data; 5078 int val = *valp; 5079 loff_t pos = *ppos; 5080 struct ctl_table lctl; 5081 int ret; 5082 5083 /* 5084 * ctl->data points to idev->cnf.forwarding, we should 5085 * not modify it until we get the rtnl lock. 5086 */ 5087 lctl = *ctl; 5088 lctl.data = &val; 5089 5090 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 5091 5092 if (write) 5093 ret = addrconf_fixup_forwarding(ctl, valp, val); 5094 if (ret) 5095 *ppos = pos; 5096 return ret; 5097 } 5098 5099 static 5100 int addrconf_sysctl_mtu(struct ctl_table *ctl, int write, 5101 void __user *buffer, size_t *lenp, loff_t *ppos) 5102 { 5103 struct inet6_dev *idev = ctl->extra1; 5104 int min_mtu = IPV6_MIN_MTU; 5105 struct ctl_table lctl; 5106 5107 lctl = *ctl; 5108 lctl.extra1 = &min_mtu; 5109 lctl.extra2 = idev ? &idev->dev->mtu : NULL; 5110 5111 return proc_dointvec_minmax(&lctl, write, buffer, lenp, ppos); 5112 } 5113 5114 static void dev_disable_change(struct inet6_dev *idev) 5115 { 5116 struct netdev_notifier_info info; 5117 5118 if (!idev || !idev->dev) 5119 return; 5120 5121 netdev_notifier_info_init(&info, idev->dev); 5122 if (idev->cnf.disable_ipv6) 5123 addrconf_notify(NULL, NETDEV_DOWN, &info); 5124 else 5125 addrconf_notify(NULL, NETDEV_UP, &info); 5126 } 5127 5128 static void addrconf_disable_change(struct net *net, __s32 newf) 5129 { 5130 struct net_device *dev; 5131 struct inet6_dev *idev; 5132 5133 rcu_read_lock(); 5134 for_each_netdev_rcu(net, dev) { 5135 idev = __in6_dev_get(dev); 5136 if (idev) { 5137 int changed = (!idev->cnf.disable_ipv6) ^ (!newf); 5138 idev->cnf.disable_ipv6 = newf; 5139 if (changed) 5140 dev_disable_change(idev); 5141 } 5142 } 5143 rcu_read_unlock(); 5144 } 5145 5146 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf) 5147 { 5148 struct net *net; 5149 int old; 5150 5151 if (!rtnl_trylock()) 5152 return restart_syscall(); 5153 5154 net = (struct net *)table->extra2; 5155 old = *p; 5156 *p = newf; 5157 5158 if (p == &net->ipv6.devconf_dflt->disable_ipv6) { 5159 rtnl_unlock(); 5160 return 0; 5161 } 5162 5163 if (p == &net->ipv6.devconf_all->disable_ipv6) { 5164 net->ipv6.devconf_dflt->disable_ipv6 = newf; 5165 addrconf_disable_change(net, newf); 5166 } else if ((!newf) ^ (!old)) 5167 dev_disable_change((struct inet6_dev *)table->extra1); 5168 5169 rtnl_unlock(); 5170 return 0; 5171 } 5172 5173 static 5174 int addrconf_sysctl_disable(struct ctl_table *ctl, int write, 5175 void __user *buffer, size_t *lenp, loff_t *ppos) 5176 { 5177 int *valp = ctl->data; 5178 int val = *valp; 5179 loff_t pos = *ppos; 5180 struct ctl_table lctl; 5181 int ret; 5182 5183 /* 5184 * ctl->data points to idev->cnf.disable_ipv6, we should 5185 * not modify it until we get the rtnl lock. 5186 */ 5187 lctl = *ctl; 5188 lctl.data = &val; 5189 5190 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 5191 5192 if (write) 5193 ret = addrconf_disable_ipv6(ctl, valp, val); 5194 if (ret) 5195 *ppos = pos; 5196 return ret; 5197 } 5198 5199 static 5200 int addrconf_sysctl_proxy_ndp(struct ctl_table *ctl, int write, 5201 void __user *buffer, size_t *lenp, loff_t *ppos) 5202 { 5203 int *valp = ctl->data; 5204 int ret; 5205 int old, new; 5206 5207 old = *valp; 5208 ret = proc_dointvec(ctl, write, buffer, lenp, ppos); 5209 new = *valp; 5210 5211 if (write && old != new) { 5212 struct net *net = ctl->extra2; 5213 5214 if (!rtnl_trylock()) 5215 return restart_syscall(); 5216 5217 if (valp == &net->ipv6.devconf_dflt->proxy_ndp) 5218 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH, 5219 NETCONFA_IFINDEX_DEFAULT, 5220 net->ipv6.devconf_dflt); 5221 else if (valp == &net->ipv6.devconf_all->proxy_ndp) 5222 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH, 5223 NETCONFA_IFINDEX_ALL, 5224 net->ipv6.devconf_all); 5225 else { 5226 struct inet6_dev *idev = ctl->extra1; 5227 5228 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH, 5229 idev->dev->ifindex, 5230 &idev->cnf); 5231 } 5232 rtnl_unlock(); 5233 } 5234 5235 return ret; 5236 } 5237 5238 static int addrconf_sysctl_stable_secret(struct ctl_table *ctl, int write, 5239 void __user *buffer, size_t *lenp, 5240 loff_t *ppos) 5241 { 5242 int err; 5243 struct in6_addr addr; 5244 char str[IPV6_MAX_STRLEN]; 5245 struct ctl_table lctl = *ctl; 5246 struct net *net = ctl->extra2; 5247 struct ipv6_stable_secret *secret = ctl->data; 5248 5249 if (&net->ipv6.devconf_all->stable_secret == ctl->data) 5250 return -EIO; 5251 5252 lctl.maxlen = IPV6_MAX_STRLEN; 5253 lctl.data = str; 5254 5255 if (!rtnl_trylock()) 5256 return restart_syscall(); 5257 5258 if (!write && !secret->initialized) { 5259 err = -EIO; 5260 goto out; 5261 } 5262 5263 if (!write) { 5264 err = snprintf(str, sizeof(str), "%pI6", 5265 &secret->secret); 5266 if (err >= sizeof(str)) { 5267 err = -EIO; 5268 goto out; 5269 } 5270 } 5271 5272 err = proc_dostring(&lctl, write, buffer, lenp, ppos); 5273 if (err || !write) 5274 goto out; 5275 5276 if (in6_pton(str, -1, addr.in6_u.u6_addr8, -1, NULL) != 1) { 5277 err = -EIO; 5278 goto out; 5279 } 5280 5281 secret->initialized = true; 5282 secret->secret = addr; 5283 5284 if (&net->ipv6.devconf_dflt->stable_secret == ctl->data) { 5285 struct net_device *dev; 5286 5287 for_each_netdev(net, dev) { 5288 struct inet6_dev *idev = __in6_dev_get(dev); 5289 5290 if (idev) { 5291 idev->addr_gen_mode = 5292 IN6_ADDR_GEN_MODE_STABLE_PRIVACY; 5293 } 5294 } 5295 } else { 5296 struct inet6_dev *idev = ctl->extra1; 5297 5298 idev->addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY; 5299 } 5300 5301 out: 5302 rtnl_unlock(); 5303 5304 return err; 5305 } 5306 5307 static struct addrconf_sysctl_table 5308 { 5309 struct ctl_table_header *sysctl_header; 5310 struct ctl_table addrconf_vars[DEVCONF_MAX+1]; 5311 } addrconf_sysctl __read_mostly = { 5312 .sysctl_header = NULL, 5313 .addrconf_vars = { 5314 { 5315 .procname = "forwarding", 5316 .data = &ipv6_devconf.forwarding, 5317 .maxlen = sizeof(int), 5318 .mode = 0644, 5319 .proc_handler = addrconf_sysctl_forward, 5320 }, 5321 { 5322 .procname = "hop_limit", 5323 .data = &ipv6_devconf.hop_limit, 5324 .maxlen = sizeof(int), 5325 .mode = 0644, 5326 .proc_handler = proc_dointvec, 5327 }, 5328 { 5329 .procname = "mtu", 5330 .data = &ipv6_devconf.mtu6, 5331 .maxlen = sizeof(int), 5332 .mode = 0644, 5333 .proc_handler = addrconf_sysctl_mtu, 5334 }, 5335 { 5336 .procname = "accept_ra", 5337 .data = &ipv6_devconf.accept_ra, 5338 .maxlen = sizeof(int), 5339 .mode = 0644, 5340 .proc_handler = proc_dointvec, 5341 }, 5342 { 5343 .procname = "accept_redirects", 5344 .data = &ipv6_devconf.accept_redirects, 5345 .maxlen = sizeof(int), 5346 .mode = 0644, 5347 .proc_handler = proc_dointvec, 5348 }, 5349 { 5350 .procname = "autoconf", 5351 .data = &ipv6_devconf.autoconf, 5352 .maxlen = sizeof(int), 5353 .mode = 0644, 5354 .proc_handler = proc_dointvec, 5355 }, 5356 { 5357 .procname = "dad_transmits", 5358 .data = &ipv6_devconf.dad_transmits, 5359 .maxlen = sizeof(int), 5360 .mode = 0644, 5361 .proc_handler = proc_dointvec, 5362 }, 5363 { 5364 .procname = "router_solicitations", 5365 .data = &ipv6_devconf.rtr_solicits, 5366 .maxlen = sizeof(int), 5367 .mode = 0644, 5368 .proc_handler = proc_dointvec, 5369 }, 5370 { 5371 .procname = "router_solicitation_interval", 5372 .data = &ipv6_devconf.rtr_solicit_interval, 5373 .maxlen = sizeof(int), 5374 .mode = 0644, 5375 .proc_handler = proc_dointvec_jiffies, 5376 }, 5377 { 5378 .procname = "router_solicitation_delay", 5379 .data = &ipv6_devconf.rtr_solicit_delay, 5380 .maxlen = sizeof(int), 5381 .mode = 0644, 5382 .proc_handler = proc_dointvec_jiffies, 5383 }, 5384 { 5385 .procname = "force_mld_version", 5386 .data = &ipv6_devconf.force_mld_version, 5387 .maxlen = sizeof(int), 5388 .mode = 0644, 5389 .proc_handler = proc_dointvec, 5390 }, 5391 { 5392 .procname = "mldv1_unsolicited_report_interval", 5393 .data = 5394 &ipv6_devconf.mldv1_unsolicited_report_interval, 5395 .maxlen = sizeof(int), 5396 .mode = 0644, 5397 .proc_handler = proc_dointvec_ms_jiffies, 5398 }, 5399 { 5400 .procname = "mldv2_unsolicited_report_interval", 5401 .data = 5402 &ipv6_devconf.mldv2_unsolicited_report_interval, 5403 .maxlen = sizeof(int), 5404 .mode = 0644, 5405 .proc_handler = proc_dointvec_ms_jiffies, 5406 }, 5407 { 5408 .procname = "use_tempaddr", 5409 .data = &ipv6_devconf.use_tempaddr, 5410 .maxlen = sizeof(int), 5411 .mode = 0644, 5412 .proc_handler = proc_dointvec, 5413 }, 5414 { 5415 .procname = "temp_valid_lft", 5416 .data = &ipv6_devconf.temp_valid_lft, 5417 .maxlen = sizeof(int), 5418 .mode = 0644, 5419 .proc_handler = proc_dointvec, 5420 }, 5421 { 5422 .procname = "temp_prefered_lft", 5423 .data = &ipv6_devconf.temp_prefered_lft, 5424 .maxlen = sizeof(int), 5425 .mode = 0644, 5426 .proc_handler = proc_dointvec, 5427 }, 5428 { 5429 .procname = "regen_max_retry", 5430 .data = &ipv6_devconf.regen_max_retry, 5431 .maxlen = sizeof(int), 5432 .mode = 0644, 5433 .proc_handler = proc_dointvec, 5434 }, 5435 { 5436 .procname = "max_desync_factor", 5437 .data = &ipv6_devconf.max_desync_factor, 5438 .maxlen = sizeof(int), 5439 .mode = 0644, 5440 .proc_handler = proc_dointvec, 5441 }, 5442 { 5443 .procname = "max_addresses", 5444 .data = &ipv6_devconf.max_addresses, 5445 .maxlen = sizeof(int), 5446 .mode = 0644, 5447 .proc_handler = proc_dointvec, 5448 }, 5449 { 5450 .procname = "accept_ra_defrtr", 5451 .data = &ipv6_devconf.accept_ra_defrtr, 5452 .maxlen = sizeof(int), 5453 .mode = 0644, 5454 .proc_handler = proc_dointvec, 5455 }, 5456 { 5457 .procname = "accept_ra_pinfo", 5458 .data = &ipv6_devconf.accept_ra_pinfo, 5459 .maxlen = sizeof(int), 5460 .mode = 0644, 5461 .proc_handler = proc_dointvec, 5462 }, 5463 #ifdef CONFIG_IPV6_ROUTER_PREF 5464 { 5465 .procname = "accept_ra_rtr_pref", 5466 .data = &ipv6_devconf.accept_ra_rtr_pref, 5467 .maxlen = sizeof(int), 5468 .mode = 0644, 5469 .proc_handler = proc_dointvec, 5470 }, 5471 { 5472 .procname = "router_probe_interval", 5473 .data = &ipv6_devconf.rtr_probe_interval, 5474 .maxlen = sizeof(int), 5475 .mode = 0644, 5476 .proc_handler = proc_dointvec_jiffies, 5477 }, 5478 #ifdef CONFIG_IPV6_ROUTE_INFO 5479 { 5480 .procname = "accept_ra_rt_info_max_plen", 5481 .data = &ipv6_devconf.accept_ra_rt_info_max_plen, 5482 .maxlen = sizeof(int), 5483 .mode = 0644, 5484 .proc_handler = proc_dointvec, 5485 }, 5486 #endif 5487 #endif 5488 { 5489 .procname = "proxy_ndp", 5490 .data = &ipv6_devconf.proxy_ndp, 5491 .maxlen = sizeof(int), 5492 .mode = 0644, 5493 .proc_handler = addrconf_sysctl_proxy_ndp, 5494 }, 5495 { 5496 .procname = "accept_source_route", 5497 .data = &ipv6_devconf.accept_source_route, 5498 .maxlen = sizeof(int), 5499 .mode = 0644, 5500 .proc_handler = proc_dointvec, 5501 }, 5502 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 5503 { 5504 .procname = "optimistic_dad", 5505 .data = &ipv6_devconf.optimistic_dad, 5506 .maxlen = sizeof(int), 5507 .mode = 0644, 5508 .proc_handler = proc_dointvec, 5509 5510 }, 5511 { 5512 .procname = "use_optimistic", 5513 .data = &ipv6_devconf.use_optimistic, 5514 .maxlen = sizeof(int), 5515 .mode = 0644, 5516 .proc_handler = proc_dointvec, 5517 5518 }, 5519 #endif 5520 #ifdef CONFIG_IPV6_MROUTE 5521 { 5522 .procname = "mc_forwarding", 5523 .data = &ipv6_devconf.mc_forwarding, 5524 .maxlen = sizeof(int), 5525 .mode = 0444, 5526 .proc_handler = proc_dointvec, 5527 }, 5528 #endif 5529 { 5530 .procname = "disable_ipv6", 5531 .data = &ipv6_devconf.disable_ipv6, 5532 .maxlen = sizeof(int), 5533 .mode = 0644, 5534 .proc_handler = addrconf_sysctl_disable, 5535 }, 5536 { 5537 .procname = "accept_dad", 5538 .data = &ipv6_devconf.accept_dad, 5539 .maxlen = sizeof(int), 5540 .mode = 0644, 5541 .proc_handler = proc_dointvec, 5542 }, 5543 { 5544 .procname = "force_tllao", 5545 .data = &ipv6_devconf.force_tllao, 5546 .maxlen = sizeof(int), 5547 .mode = 0644, 5548 .proc_handler = proc_dointvec 5549 }, 5550 { 5551 .procname = "ndisc_notify", 5552 .data = &ipv6_devconf.ndisc_notify, 5553 .maxlen = sizeof(int), 5554 .mode = 0644, 5555 .proc_handler = proc_dointvec 5556 }, 5557 { 5558 .procname = "suppress_frag_ndisc", 5559 .data = &ipv6_devconf.suppress_frag_ndisc, 5560 .maxlen = sizeof(int), 5561 .mode = 0644, 5562 .proc_handler = proc_dointvec 5563 }, 5564 { 5565 .procname = "accept_ra_from_local", 5566 .data = &ipv6_devconf.accept_ra_from_local, 5567 .maxlen = sizeof(int), 5568 .mode = 0644, 5569 .proc_handler = proc_dointvec, 5570 }, 5571 { 5572 .procname = "accept_ra_mtu", 5573 .data = &ipv6_devconf.accept_ra_mtu, 5574 .maxlen = sizeof(int), 5575 .mode = 0644, 5576 .proc_handler = proc_dointvec, 5577 }, 5578 { 5579 .procname = "stable_secret", 5580 .data = &ipv6_devconf.stable_secret, 5581 .maxlen = IPV6_MAX_STRLEN, 5582 .mode = 0600, 5583 .proc_handler = addrconf_sysctl_stable_secret, 5584 }, 5585 { 5586 /* sentinel */ 5587 } 5588 }, 5589 }; 5590 5591 static int __addrconf_sysctl_register(struct net *net, char *dev_name, 5592 struct inet6_dev *idev, struct ipv6_devconf *p) 5593 { 5594 int i; 5595 struct addrconf_sysctl_table *t; 5596 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ]; 5597 5598 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL); 5599 if (!t) 5600 goto out; 5601 5602 for (i = 0; t->addrconf_vars[i].data; i++) { 5603 t->addrconf_vars[i].data += (char *)p - (char *)&ipv6_devconf; 5604 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */ 5605 t->addrconf_vars[i].extra2 = net; 5606 } 5607 5608 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name); 5609 5610 t->sysctl_header = register_net_sysctl(net, path, t->addrconf_vars); 5611 if (!t->sysctl_header) 5612 goto free; 5613 5614 p->sysctl = t; 5615 return 0; 5616 5617 free: 5618 kfree(t); 5619 out: 5620 return -ENOBUFS; 5621 } 5622 5623 static void __addrconf_sysctl_unregister(struct ipv6_devconf *p) 5624 { 5625 struct addrconf_sysctl_table *t; 5626 5627 if (!p->sysctl) 5628 return; 5629 5630 t = p->sysctl; 5631 p->sysctl = NULL; 5632 unregister_net_sysctl_table(t->sysctl_header); 5633 kfree(t); 5634 } 5635 5636 static int addrconf_sysctl_register(struct inet6_dev *idev) 5637 { 5638 int err; 5639 5640 if (!sysctl_dev_name_is_allowed(idev->dev->name)) 5641 return -EINVAL; 5642 5643 err = neigh_sysctl_register(idev->dev, idev->nd_parms, 5644 &ndisc_ifinfo_sysctl_change); 5645 if (err) 5646 return err; 5647 err = __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name, 5648 idev, &idev->cnf); 5649 if (err) 5650 neigh_sysctl_unregister(idev->nd_parms); 5651 5652 return err; 5653 } 5654 5655 static void addrconf_sysctl_unregister(struct inet6_dev *idev) 5656 { 5657 __addrconf_sysctl_unregister(&idev->cnf); 5658 neigh_sysctl_unregister(idev->nd_parms); 5659 } 5660 5661 5662 #endif 5663 5664 static int __net_init addrconf_init_net(struct net *net) 5665 { 5666 int err = -ENOMEM; 5667 struct ipv6_devconf *all, *dflt; 5668 5669 all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL); 5670 if (!all) 5671 goto err_alloc_all; 5672 5673 dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL); 5674 if (!dflt) 5675 goto err_alloc_dflt; 5676 5677 /* these will be inherited by all namespaces */ 5678 dflt->autoconf = ipv6_defaults.autoconf; 5679 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6; 5680 5681 dflt->stable_secret.initialized = false; 5682 all->stable_secret.initialized = false; 5683 5684 net->ipv6.devconf_all = all; 5685 net->ipv6.devconf_dflt = dflt; 5686 5687 #ifdef CONFIG_SYSCTL 5688 err = __addrconf_sysctl_register(net, "all", NULL, all); 5689 if (err < 0) 5690 goto err_reg_all; 5691 5692 err = __addrconf_sysctl_register(net, "default", NULL, dflt); 5693 if (err < 0) 5694 goto err_reg_dflt; 5695 #endif 5696 return 0; 5697 5698 #ifdef CONFIG_SYSCTL 5699 err_reg_dflt: 5700 __addrconf_sysctl_unregister(all); 5701 err_reg_all: 5702 kfree(dflt); 5703 #endif 5704 err_alloc_dflt: 5705 kfree(all); 5706 err_alloc_all: 5707 return err; 5708 } 5709 5710 static void __net_exit addrconf_exit_net(struct net *net) 5711 { 5712 #ifdef CONFIG_SYSCTL 5713 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt); 5714 __addrconf_sysctl_unregister(net->ipv6.devconf_all); 5715 #endif 5716 kfree(net->ipv6.devconf_dflt); 5717 kfree(net->ipv6.devconf_all); 5718 } 5719 5720 static struct pernet_operations addrconf_ops = { 5721 .init = addrconf_init_net, 5722 .exit = addrconf_exit_net, 5723 }; 5724 5725 static struct rtnl_af_ops inet6_ops __read_mostly = { 5726 .family = AF_INET6, 5727 .fill_link_af = inet6_fill_link_af, 5728 .get_link_af_size = inet6_get_link_af_size, 5729 .validate_link_af = inet6_validate_link_af, 5730 .set_link_af = inet6_set_link_af, 5731 }; 5732 5733 /* 5734 * Init / cleanup code 5735 */ 5736 5737 int __init addrconf_init(void) 5738 { 5739 struct inet6_dev *idev; 5740 int i, err; 5741 5742 err = ipv6_addr_label_init(); 5743 if (err < 0) { 5744 pr_crit("%s: cannot initialize default policy table: %d\n", 5745 __func__, err); 5746 goto out; 5747 } 5748 5749 err = register_pernet_subsys(&addrconf_ops); 5750 if (err < 0) 5751 goto out_addrlabel; 5752 5753 addrconf_wq = create_workqueue("ipv6_addrconf"); 5754 if (!addrconf_wq) { 5755 err = -ENOMEM; 5756 goto out_nowq; 5757 } 5758 5759 /* The addrconf netdev notifier requires that loopback_dev 5760 * has it's ipv6 private information allocated and setup 5761 * before it can bring up and give link-local addresses 5762 * to other devices which are up. 5763 * 5764 * Unfortunately, loopback_dev is not necessarily the first 5765 * entry in the global dev_base list of net devices. In fact, 5766 * it is likely to be the very last entry on that list. 5767 * So this causes the notifier registry below to try and 5768 * give link-local addresses to all devices besides loopback_dev 5769 * first, then loopback_dev, which cases all the non-loopback_dev 5770 * devices to fail to get a link-local address. 5771 * 5772 * So, as a temporary fix, allocate the ipv6 structure for 5773 * loopback_dev first by hand. 5774 * Longer term, all of the dependencies ipv6 has upon the loopback 5775 * device and it being up should be removed. 5776 */ 5777 rtnl_lock(); 5778 idev = ipv6_add_dev(init_net.loopback_dev); 5779 rtnl_unlock(); 5780 if (IS_ERR(idev)) { 5781 err = PTR_ERR(idev); 5782 goto errlo; 5783 } 5784 5785 for (i = 0; i < IN6_ADDR_HSIZE; i++) 5786 INIT_HLIST_HEAD(&inet6_addr_lst[i]); 5787 5788 register_netdevice_notifier(&ipv6_dev_notf); 5789 5790 addrconf_verify(); 5791 5792 rtnl_af_register(&inet6_ops); 5793 5794 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo, 5795 NULL); 5796 if (err < 0) 5797 goto errout; 5798 5799 /* Only the first call to __rtnl_register can fail */ 5800 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL, NULL); 5801 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL, NULL); 5802 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr, 5803 inet6_dump_ifaddr, NULL); 5804 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL, 5805 inet6_dump_ifmcaddr, NULL); 5806 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL, 5807 inet6_dump_ifacaddr, NULL); 5808 __rtnl_register(PF_INET6, RTM_GETNETCONF, inet6_netconf_get_devconf, 5809 inet6_netconf_dump_devconf, NULL); 5810 5811 ipv6_addr_label_rtnl_register(); 5812 5813 return 0; 5814 errout: 5815 rtnl_af_unregister(&inet6_ops); 5816 unregister_netdevice_notifier(&ipv6_dev_notf); 5817 errlo: 5818 destroy_workqueue(addrconf_wq); 5819 out_nowq: 5820 unregister_pernet_subsys(&addrconf_ops); 5821 out_addrlabel: 5822 ipv6_addr_label_cleanup(); 5823 out: 5824 return err; 5825 } 5826 5827 void addrconf_cleanup(void) 5828 { 5829 struct net_device *dev; 5830 int i; 5831 5832 unregister_netdevice_notifier(&ipv6_dev_notf); 5833 unregister_pernet_subsys(&addrconf_ops); 5834 ipv6_addr_label_cleanup(); 5835 5836 rtnl_lock(); 5837 5838 __rtnl_af_unregister(&inet6_ops); 5839 5840 /* clean dev list */ 5841 for_each_netdev(&init_net, dev) { 5842 if (__in6_dev_get(dev) == NULL) 5843 continue; 5844 addrconf_ifdown(dev, 1); 5845 } 5846 addrconf_ifdown(init_net.loopback_dev, 2); 5847 5848 /* 5849 * Check hash table. 5850 */ 5851 spin_lock_bh(&addrconf_hash_lock); 5852 for (i = 0; i < IN6_ADDR_HSIZE; i++) 5853 WARN_ON(!hlist_empty(&inet6_addr_lst[i])); 5854 spin_unlock_bh(&addrconf_hash_lock); 5855 cancel_delayed_work(&addr_chk_work); 5856 rtnl_unlock(); 5857 5858 destroy_workqueue(addrconf_wq); 5859 } 5860