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 2125 noflags |= RTF_CACHE; 2126 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) { 2127 if (rt->dst.dev->ifindex != dev->ifindex) 2128 continue; 2129 if ((rt->rt6i_flags & flags) != flags) 2130 continue; 2131 if ((rt->rt6i_flags & noflags) != 0) 2132 continue; 2133 dst_hold(&rt->dst); 2134 break; 2135 } 2136 out: 2137 read_unlock_bh(&table->tb6_lock); 2138 return rt; 2139 } 2140 2141 2142 /* Create "default" multicast route to the interface */ 2143 2144 static void addrconf_add_mroute(struct net_device *dev) 2145 { 2146 struct fib6_config cfg = { 2147 .fc_table = RT6_TABLE_LOCAL, 2148 .fc_metric = IP6_RT_PRIO_ADDRCONF, 2149 .fc_ifindex = dev->ifindex, 2150 .fc_dst_len = 8, 2151 .fc_flags = RTF_UP, 2152 .fc_nlinfo.nl_net = dev_net(dev), 2153 }; 2154 2155 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0); 2156 2157 ip6_route_add(&cfg); 2158 } 2159 2160 static struct inet6_dev *addrconf_add_dev(struct net_device *dev) 2161 { 2162 struct inet6_dev *idev; 2163 2164 ASSERT_RTNL(); 2165 2166 idev = ipv6_find_idev(dev); 2167 if (!idev) 2168 return ERR_PTR(-ENOBUFS); 2169 2170 if (idev->cnf.disable_ipv6) 2171 return ERR_PTR(-EACCES); 2172 2173 /* Add default multicast route */ 2174 if (!(dev->flags & IFF_LOOPBACK)) 2175 addrconf_add_mroute(dev); 2176 2177 return idev; 2178 } 2179 2180 static void manage_tempaddrs(struct inet6_dev *idev, 2181 struct inet6_ifaddr *ifp, 2182 __u32 valid_lft, __u32 prefered_lft, 2183 bool create, unsigned long now) 2184 { 2185 u32 flags; 2186 struct inet6_ifaddr *ift; 2187 2188 read_lock_bh(&idev->lock); 2189 /* update all temporary addresses in the list */ 2190 list_for_each_entry(ift, &idev->tempaddr_list, tmp_list) { 2191 int age, max_valid, max_prefered; 2192 2193 if (ifp != ift->ifpub) 2194 continue; 2195 2196 /* RFC 4941 section 3.3: 2197 * If a received option will extend the lifetime of a public 2198 * address, the lifetimes of temporary addresses should 2199 * be extended, subject to the overall constraint that no 2200 * temporary addresses should ever remain "valid" or "preferred" 2201 * for a time longer than (TEMP_VALID_LIFETIME) or 2202 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), respectively. 2203 */ 2204 age = (now - ift->cstamp) / HZ; 2205 max_valid = idev->cnf.temp_valid_lft - age; 2206 if (max_valid < 0) 2207 max_valid = 0; 2208 2209 max_prefered = idev->cnf.temp_prefered_lft - 2210 idev->cnf.max_desync_factor - age; 2211 if (max_prefered < 0) 2212 max_prefered = 0; 2213 2214 if (valid_lft > max_valid) 2215 valid_lft = max_valid; 2216 2217 if (prefered_lft > max_prefered) 2218 prefered_lft = max_prefered; 2219 2220 spin_lock(&ift->lock); 2221 flags = ift->flags; 2222 ift->valid_lft = valid_lft; 2223 ift->prefered_lft = prefered_lft; 2224 ift->tstamp = now; 2225 if (prefered_lft > 0) 2226 ift->flags &= ~IFA_F_DEPRECATED; 2227 2228 spin_unlock(&ift->lock); 2229 if (!(flags&IFA_F_TENTATIVE)) 2230 ipv6_ifa_notify(0, ift); 2231 } 2232 2233 if ((create || list_empty(&idev->tempaddr_list)) && 2234 idev->cnf.use_tempaddr > 0) { 2235 /* When a new public address is created as described 2236 * in [ADDRCONF], also create a new temporary address. 2237 * Also create a temporary address if it's enabled but 2238 * no temporary address currently exists. 2239 */ 2240 read_unlock_bh(&idev->lock); 2241 ipv6_create_tempaddr(ifp, NULL); 2242 } else { 2243 read_unlock_bh(&idev->lock); 2244 } 2245 } 2246 2247 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao) 2248 { 2249 struct prefix_info *pinfo; 2250 __u32 valid_lft; 2251 __u32 prefered_lft; 2252 int addr_type; 2253 u32 addr_flags = 0; 2254 struct inet6_dev *in6_dev; 2255 struct net *net = dev_net(dev); 2256 2257 pinfo = (struct prefix_info *) opt; 2258 2259 if (len < sizeof(struct prefix_info)) { 2260 ADBG("addrconf: prefix option too short\n"); 2261 return; 2262 } 2263 2264 /* 2265 * Validation checks ([ADDRCONF], page 19) 2266 */ 2267 2268 addr_type = ipv6_addr_type(&pinfo->prefix); 2269 2270 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL)) 2271 return; 2272 2273 valid_lft = ntohl(pinfo->valid); 2274 prefered_lft = ntohl(pinfo->prefered); 2275 2276 if (prefered_lft > valid_lft) { 2277 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n"); 2278 return; 2279 } 2280 2281 in6_dev = in6_dev_get(dev); 2282 2283 if (!in6_dev) { 2284 net_dbg_ratelimited("addrconf: device %s not configured\n", 2285 dev->name); 2286 return; 2287 } 2288 2289 /* 2290 * Two things going on here: 2291 * 1) Add routes for on-link prefixes 2292 * 2) Configure prefixes with the auto flag set 2293 */ 2294 2295 if (pinfo->onlink) { 2296 struct rt6_info *rt; 2297 unsigned long rt_expires; 2298 2299 /* Avoid arithmetic overflow. Really, we could 2300 * save rt_expires in seconds, likely valid_lft, 2301 * but it would require division in fib gc, that it 2302 * not good. 2303 */ 2304 if (HZ > USER_HZ) 2305 rt_expires = addrconf_timeout_fixup(valid_lft, HZ); 2306 else 2307 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ); 2308 2309 if (addrconf_finite_timeout(rt_expires)) 2310 rt_expires *= HZ; 2311 2312 rt = addrconf_get_prefix_route(&pinfo->prefix, 2313 pinfo->prefix_len, 2314 dev, 2315 RTF_ADDRCONF | RTF_PREFIX_RT, 2316 RTF_GATEWAY | RTF_DEFAULT); 2317 2318 if (rt) { 2319 /* Autoconf prefix route */ 2320 if (valid_lft == 0) { 2321 ip6_del_rt(rt); 2322 rt = NULL; 2323 } else if (addrconf_finite_timeout(rt_expires)) { 2324 /* not infinity */ 2325 rt6_set_expires(rt, jiffies + rt_expires); 2326 } else { 2327 rt6_clean_expires(rt); 2328 } 2329 } else if (valid_lft) { 2330 clock_t expires = 0; 2331 int flags = RTF_ADDRCONF | RTF_PREFIX_RT; 2332 if (addrconf_finite_timeout(rt_expires)) { 2333 /* not infinity */ 2334 flags |= RTF_EXPIRES; 2335 expires = jiffies_to_clock_t(rt_expires); 2336 } 2337 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len, 2338 dev, expires, flags); 2339 } 2340 ip6_rt_put(rt); 2341 } 2342 2343 /* Try to figure out our local address for this prefix */ 2344 2345 if (pinfo->autoconf && in6_dev->cnf.autoconf) { 2346 struct inet6_ifaddr *ifp; 2347 struct in6_addr addr; 2348 int create = 0, update_lft = 0; 2349 bool tokenized = false; 2350 2351 if (pinfo->prefix_len == 64) { 2352 memcpy(&addr, &pinfo->prefix, 8); 2353 2354 if (!ipv6_addr_any(&in6_dev->token)) { 2355 read_lock_bh(&in6_dev->lock); 2356 memcpy(addr.s6_addr + 8, 2357 in6_dev->token.s6_addr + 8, 8); 2358 read_unlock_bh(&in6_dev->lock); 2359 tokenized = true; 2360 } else if (in6_dev->addr_gen_mode == 2361 IN6_ADDR_GEN_MODE_STABLE_PRIVACY && 2362 !ipv6_generate_stable_address(&addr, 0, 2363 in6_dev)) { 2364 addr_flags |= IFA_F_STABLE_PRIVACY; 2365 goto ok; 2366 } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) && 2367 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) { 2368 in6_dev_put(in6_dev); 2369 return; 2370 } 2371 goto ok; 2372 } 2373 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n", 2374 pinfo->prefix_len); 2375 in6_dev_put(in6_dev); 2376 return; 2377 2378 ok: 2379 2380 ifp = ipv6_get_ifaddr(net, &addr, dev, 1); 2381 2382 if (!ifp && valid_lft) { 2383 int max_addresses = in6_dev->cnf.max_addresses; 2384 2385 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 2386 if (in6_dev->cnf.optimistic_dad && 2387 !net->ipv6.devconf_all->forwarding && sllao) 2388 addr_flags = IFA_F_OPTIMISTIC; 2389 #endif 2390 2391 /* Do not allow to create too much of autoconfigured 2392 * addresses; this would be too easy way to crash kernel. 2393 */ 2394 if (!max_addresses || 2395 ipv6_count_addresses(in6_dev) < max_addresses) 2396 ifp = ipv6_add_addr(in6_dev, &addr, NULL, 2397 pinfo->prefix_len, 2398 addr_type&IPV6_ADDR_SCOPE_MASK, 2399 addr_flags, valid_lft, 2400 prefered_lft); 2401 2402 if (IS_ERR_OR_NULL(ifp)) { 2403 in6_dev_put(in6_dev); 2404 return; 2405 } 2406 2407 update_lft = 0; 2408 create = 1; 2409 spin_lock_bh(&ifp->lock); 2410 ifp->flags |= IFA_F_MANAGETEMPADDR; 2411 ifp->cstamp = jiffies; 2412 ifp->tokenized = tokenized; 2413 spin_unlock_bh(&ifp->lock); 2414 addrconf_dad_start(ifp); 2415 } 2416 2417 if (ifp) { 2418 u32 flags; 2419 unsigned long now; 2420 u32 stored_lft; 2421 2422 /* update lifetime (RFC2462 5.5.3 e) */ 2423 spin_lock_bh(&ifp->lock); 2424 now = jiffies; 2425 if (ifp->valid_lft > (now - ifp->tstamp) / HZ) 2426 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ; 2427 else 2428 stored_lft = 0; 2429 if (!update_lft && !create && stored_lft) { 2430 const u32 minimum_lft = min_t(u32, 2431 stored_lft, MIN_VALID_LIFETIME); 2432 valid_lft = max(valid_lft, minimum_lft); 2433 2434 /* RFC4862 Section 5.5.3e: 2435 * "Note that the preferred lifetime of the 2436 * corresponding address is always reset to 2437 * the Preferred Lifetime in the received 2438 * Prefix Information option, regardless of 2439 * whether the valid lifetime is also reset or 2440 * ignored." 2441 * 2442 * So we should always update prefered_lft here. 2443 */ 2444 update_lft = 1; 2445 } 2446 2447 if (update_lft) { 2448 ifp->valid_lft = valid_lft; 2449 ifp->prefered_lft = prefered_lft; 2450 ifp->tstamp = now; 2451 flags = ifp->flags; 2452 ifp->flags &= ~IFA_F_DEPRECATED; 2453 spin_unlock_bh(&ifp->lock); 2454 2455 if (!(flags&IFA_F_TENTATIVE)) 2456 ipv6_ifa_notify(0, ifp); 2457 } else 2458 spin_unlock_bh(&ifp->lock); 2459 2460 manage_tempaddrs(in6_dev, ifp, valid_lft, prefered_lft, 2461 create, now); 2462 2463 in6_ifa_put(ifp); 2464 addrconf_verify(); 2465 } 2466 } 2467 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo); 2468 in6_dev_put(in6_dev); 2469 } 2470 2471 /* 2472 * Set destination address. 2473 * Special case for SIT interfaces where we create a new "virtual" 2474 * device. 2475 */ 2476 int addrconf_set_dstaddr(struct net *net, void __user *arg) 2477 { 2478 struct in6_ifreq ireq; 2479 struct net_device *dev; 2480 int err = -EINVAL; 2481 2482 rtnl_lock(); 2483 2484 err = -EFAULT; 2485 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2486 goto err_exit; 2487 2488 dev = __dev_get_by_index(net, ireq.ifr6_ifindex); 2489 2490 err = -ENODEV; 2491 if (!dev) 2492 goto err_exit; 2493 2494 #if IS_ENABLED(CONFIG_IPV6_SIT) 2495 if (dev->type == ARPHRD_SIT) { 2496 const struct net_device_ops *ops = dev->netdev_ops; 2497 struct ifreq ifr; 2498 struct ip_tunnel_parm p; 2499 2500 err = -EADDRNOTAVAIL; 2501 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4)) 2502 goto err_exit; 2503 2504 memset(&p, 0, sizeof(p)); 2505 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3]; 2506 p.iph.saddr = 0; 2507 p.iph.version = 4; 2508 p.iph.ihl = 5; 2509 p.iph.protocol = IPPROTO_IPV6; 2510 p.iph.ttl = 64; 2511 ifr.ifr_ifru.ifru_data = (__force void __user *)&p; 2512 2513 if (ops->ndo_do_ioctl) { 2514 mm_segment_t oldfs = get_fs(); 2515 2516 set_fs(KERNEL_DS); 2517 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL); 2518 set_fs(oldfs); 2519 } else 2520 err = -EOPNOTSUPP; 2521 2522 if (err == 0) { 2523 err = -ENOBUFS; 2524 dev = __dev_get_by_name(net, p.name); 2525 if (!dev) 2526 goto err_exit; 2527 err = dev_open(dev); 2528 } 2529 } 2530 #endif 2531 2532 err_exit: 2533 rtnl_unlock(); 2534 return err; 2535 } 2536 2537 static int ipv6_mc_config(struct sock *sk, bool join, 2538 const struct in6_addr *addr, int ifindex) 2539 { 2540 int ret; 2541 2542 ASSERT_RTNL(); 2543 2544 lock_sock(sk); 2545 if (join) 2546 ret = ipv6_sock_mc_join(sk, ifindex, addr); 2547 else 2548 ret = ipv6_sock_mc_drop(sk, ifindex, addr); 2549 release_sock(sk); 2550 2551 return ret; 2552 } 2553 2554 /* 2555 * Manual configuration of address on an interface 2556 */ 2557 static int inet6_addr_add(struct net *net, int ifindex, 2558 const struct in6_addr *pfx, 2559 const struct in6_addr *peer_pfx, 2560 unsigned int plen, __u32 ifa_flags, 2561 __u32 prefered_lft, __u32 valid_lft) 2562 { 2563 struct inet6_ifaddr *ifp; 2564 struct inet6_dev *idev; 2565 struct net_device *dev; 2566 unsigned long timeout; 2567 clock_t expires; 2568 int scope; 2569 u32 flags; 2570 2571 ASSERT_RTNL(); 2572 2573 if (plen > 128) 2574 return -EINVAL; 2575 2576 /* check the lifetime */ 2577 if (!valid_lft || prefered_lft > valid_lft) 2578 return -EINVAL; 2579 2580 if (ifa_flags & IFA_F_MANAGETEMPADDR && plen != 64) 2581 return -EINVAL; 2582 2583 dev = __dev_get_by_index(net, ifindex); 2584 if (!dev) 2585 return -ENODEV; 2586 2587 idev = addrconf_add_dev(dev); 2588 if (IS_ERR(idev)) 2589 return PTR_ERR(idev); 2590 2591 if (ifa_flags & IFA_F_MCAUTOJOIN) { 2592 int ret = ipv6_mc_config(net->ipv6.mc_autojoin_sk, 2593 true, pfx, ifindex); 2594 2595 if (ret < 0) 2596 return ret; 2597 } 2598 2599 scope = ipv6_addr_scope(pfx); 2600 2601 timeout = addrconf_timeout_fixup(valid_lft, HZ); 2602 if (addrconf_finite_timeout(timeout)) { 2603 expires = jiffies_to_clock_t(timeout * HZ); 2604 valid_lft = timeout; 2605 flags = RTF_EXPIRES; 2606 } else { 2607 expires = 0; 2608 flags = 0; 2609 ifa_flags |= IFA_F_PERMANENT; 2610 } 2611 2612 timeout = addrconf_timeout_fixup(prefered_lft, HZ); 2613 if (addrconf_finite_timeout(timeout)) { 2614 if (timeout == 0) 2615 ifa_flags |= IFA_F_DEPRECATED; 2616 prefered_lft = timeout; 2617 } 2618 2619 ifp = ipv6_add_addr(idev, pfx, peer_pfx, plen, scope, ifa_flags, 2620 valid_lft, prefered_lft); 2621 2622 if (!IS_ERR(ifp)) { 2623 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) { 2624 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev, 2625 expires, flags); 2626 } 2627 2628 /* 2629 * Note that section 3.1 of RFC 4429 indicates 2630 * that the Optimistic flag should not be set for 2631 * manually configured addresses 2632 */ 2633 addrconf_dad_start(ifp); 2634 if (ifa_flags & IFA_F_MANAGETEMPADDR) 2635 manage_tempaddrs(idev, ifp, valid_lft, prefered_lft, 2636 true, jiffies); 2637 in6_ifa_put(ifp); 2638 addrconf_verify_rtnl(); 2639 return 0; 2640 } else if (ifa_flags & IFA_F_MCAUTOJOIN) { 2641 ipv6_mc_config(net->ipv6.mc_autojoin_sk, 2642 false, pfx, ifindex); 2643 } 2644 2645 return PTR_ERR(ifp); 2646 } 2647 2648 static int inet6_addr_del(struct net *net, int ifindex, u32 ifa_flags, 2649 const struct in6_addr *pfx, unsigned int plen) 2650 { 2651 struct inet6_ifaddr *ifp; 2652 struct inet6_dev *idev; 2653 struct net_device *dev; 2654 2655 if (plen > 128) 2656 return -EINVAL; 2657 2658 dev = __dev_get_by_index(net, ifindex); 2659 if (!dev) 2660 return -ENODEV; 2661 2662 idev = __in6_dev_get(dev); 2663 if (!idev) 2664 return -ENXIO; 2665 2666 read_lock_bh(&idev->lock); 2667 list_for_each_entry(ifp, &idev->addr_list, if_list) { 2668 if (ifp->prefix_len == plen && 2669 ipv6_addr_equal(pfx, &ifp->addr)) { 2670 in6_ifa_hold(ifp); 2671 read_unlock_bh(&idev->lock); 2672 2673 if (!(ifp->flags & IFA_F_TEMPORARY) && 2674 (ifa_flags & IFA_F_MANAGETEMPADDR)) 2675 manage_tempaddrs(idev, ifp, 0, 0, false, 2676 jiffies); 2677 ipv6_del_addr(ifp); 2678 addrconf_verify_rtnl(); 2679 if (ipv6_addr_is_multicast(pfx)) { 2680 ipv6_mc_config(net->ipv6.mc_autojoin_sk, 2681 false, pfx, dev->ifindex); 2682 } 2683 return 0; 2684 } 2685 } 2686 read_unlock_bh(&idev->lock); 2687 return -EADDRNOTAVAIL; 2688 } 2689 2690 2691 int addrconf_add_ifaddr(struct net *net, void __user *arg) 2692 { 2693 struct in6_ifreq ireq; 2694 int err; 2695 2696 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 2697 return -EPERM; 2698 2699 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2700 return -EFAULT; 2701 2702 rtnl_lock(); 2703 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, NULL, 2704 ireq.ifr6_prefixlen, IFA_F_PERMANENT, 2705 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME); 2706 rtnl_unlock(); 2707 return err; 2708 } 2709 2710 int addrconf_del_ifaddr(struct net *net, void __user *arg) 2711 { 2712 struct in6_ifreq ireq; 2713 int err; 2714 2715 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 2716 return -EPERM; 2717 2718 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2719 return -EFAULT; 2720 2721 rtnl_lock(); 2722 err = inet6_addr_del(net, ireq.ifr6_ifindex, 0, &ireq.ifr6_addr, 2723 ireq.ifr6_prefixlen); 2724 rtnl_unlock(); 2725 return err; 2726 } 2727 2728 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr, 2729 int plen, int scope) 2730 { 2731 struct inet6_ifaddr *ifp; 2732 2733 ifp = ipv6_add_addr(idev, addr, NULL, plen, 2734 scope, IFA_F_PERMANENT, 2735 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME); 2736 if (!IS_ERR(ifp)) { 2737 spin_lock_bh(&ifp->lock); 2738 ifp->flags &= ~IFA_F_TENTATIVE; 2739 spin_unlock_bh(&ifp->lock); 2740 ipv6_ifa_notify(RTM_NEWADDR, ifp); 2741 in6_ifa_put(ifp); 2742 } 2743 } 2744 2745 #if IS_ENABLED(CONFIG_IPV6_SIT) 2746 static void sit_add_v4_addrs(struct inet6_dev *idev) 2747 { 2748 struct in6_addr addr; 2749 struct net_device *dev; 2750 struct net *net = dev_net(idev->dev); 2751 int scope, plen; 2752 u32 pflags = 0; 2753 2754 ASSERT_RTNL(); 2755 2756 memset(&addr, 0, sizeof(struct in6_addr)); 2757 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4); 2758 2759 if (idev->dev->flags&IFF_POINTOPOINT) { 2760 addr.s6_addr32[0] = htonl(0xfe800000); 2761 scope = IFA_LINK; 2762 plen = 64; 2763 } else { 2764 scope = IPV6_ADDR_COMPATv4; 2765 plen = 96; 2766 pflags |= RTF_NONEXTHOP; 2767 } 2768 2769 if (addr.s6_addr32[3]) { 2770 add_addr(idev, &addr, plen, scope); 2771 addrconf_prefix_route(&addr, plen, idev->dev, 0, pflags); 2772 return; 2773 } 2774 2775 for_each_netdev(net, dev) { 2776 struct in_device *in_dev = __in_dev_get_rtnl(dev); 2777 if (in_dev && (dev->flags & IFF_UP)) { 2778 struct in_ifaddr *ifa; 2779 2780 int flag = scope; 2781 2782 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) { 2783 2784 addr.s6_addr32[3] = ifa->ifa_local; 2785 2786 if (ifa->ifa_scope == RT_SCOPE_LINK) 2787 continue; 2788 if (ifa->ifa_scope >= RT_SCOPE_HOST) { 2789 if (idev->dev->flags&IFF_POINTOPOINT) 2790 continue; 2791 flag |= IFA_HOST; 2792 } 2793 2794 add_addr(idev, &addr, plen, flag); 2795 addrconf_prefix_route(&addr, plen, idev->dev, 0, 2796 pflags); 2797 } 2798 } 2799 } 2800 } 2801 #endif 2802 2803 static void init_loopback(struct net_device *dev) 2804 { 2805 struct inet6_dev *idev; 2806 struct net_device *sp_dev; 2807 struct inet6_ifaddr *sp_ifa; 2808 struct rt6_info *sp_rt; 2809 2810 /* ::1 */ 2811 2812 ASSERT_RTNL(); 2813 2814 idev = ipv6_find_idev(dev); 2815 if (!idev) { 2816 pr_debug("%s: add_dev failed\n", __func__); 2817 return; 2818 } 2819 2820 add_addr(idev, &in6addr_loopback, 128, IFA_HOST); 2821 2822 /* Add routes to other interface's IPv6 addresses */ 2823 for_each_netdev(dev_net(dev), sp_dev) { 2824 if (!strcmp(sp_dev->name, dev->name)) 2825 continue; 2826 2827 idev = __in6_dev_get(sp_dev); 2828 if (!idev) 2829 continue; 2830 2831 read_lock_bh(&idev->lock); 2832 list_for_each_entry(sp_ifa, &idev->addr_list, if_list) { 2833 2834 if (sp_ifa->flags & (IFA_F_DADFAILED | IFA_F_TENTATIVE)) 2835 continue; 2836 2837 if (sp_ifa->rt) { 2838 /* This dst has been added to garbage list when 2839 * lo device down, release this obsolete dst and 2840 * reallocate a new router for ifa. 2841 */ 2842 if (sp_ifa->rt->dst.obsolete > 0) { 2843 ip6_rt_put(sp_ifa->rt); 2844 sp_ifa->rt = NULL; 2845 } else { 2846 continue; 2847 } 2848 } 2849 2850 sp_rt = addrconf_dst_alloc(idev, &sp_ifa->addr, false); 2851 2852 /* Failure cases are ignored */ 2853 if (!IS_ERR(sp_rt)) { 2854 sp_ifa->rt = sp_rt; 2855 ip6_ins_rt(sp_rt); 2856 } 2857 } 2858 read_unlock_bh(&idev->lock); 2859 } 2860 } 2861 2862 static void addrconf_add_linklocal(struct inet6_dev *idev, 2863 const struct in6_addr *addr, u32 flags) 2864 { 2865 struct inet6_ifaddr *ifp; 2866 u32 addr_flags = flags | IFA_F_PERMANENT; 2867 2868 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 2869 if (idev->cnf.optimistic_dad && 2870 !dev_net(idev->dev)->ipv6.devconf_all->forwarding) 2871 addr_flags |= IFA_F_OPTIMISTIC; 2872 #endif 2873 2874 ifp = ipv6_add_addr(idev, addr, NULL, 64, IFA_LINK, addr_flags, 2875 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME); 2876 if (!IS_ERR(ifp)) { 2877 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0); 2878 addrconf_dad_start(ifp); 2879 in6_ifa_put(ifp); 2880 } 2881 } 2882 2883 static bool ipv6_reserved_interfaceid(struct in6_addr address) 2884 { 2885 if ((address.s6_addr32[2] | address.s6_addr32[3]) == 0) 2886 return true; 2887 2888 if (address.s6_addr32[2] == htonl(0x02005eff) && 2889 ((address.s6_addr32[3] & htonl(0xfe000000)) == htonl(0xfe000000))) 2890 return true; 2891 2892 if (address.s6_addr32[2] == htonl(0xfdffffff) && 2893 ((address.s6_addr32[3] & htonl(0xffffff80)) == htonl(0xffffff80))) 2894 return true; 2895 2896 return false; 2897 } 2898 2899 static int ipv6_generate_stable_address(struct in6_addr *address, 2900 u8 dad_count, 2901 const struct inet6_dev *idev) 2902 { 2903 static DEFINE_SPINLOCK(lock); 2904 static __u32 digest[SHA_DIGEST_WORDS]; 2905 static __u32 workspace[SHA_WORKSPACE_WORDS]; 2906 2907 static union { 2908 char __data[SHA_MESSAGE_BYTES]; 2909 struct { 2910 struct in6_addr secret; 2911 __be32 prefix[2]; 2912 unsigned char hwaddr[MAX_ADDR_LEN]; 2913 u8 dad_count; 2914 } __packed; 2915 } data; 2916 2917 struct in6_addr secret; 2918 struct in6_addr temp; 2919 struct net *net = dev_net(idev->dev); 2920 2921 BUILD_BUG_ON(sizeof(data.__data) != sizeof(data)); 2922 2923 if (idev->cnf.stable_secret.initialized) 2924 secret = idev->cnf.stable_secret.secret; 2925 else if (net->ipv6.devconf_dflt->stable_secret.initialized) 2926 secret = net->ipv6.devconf_dflt->stable_secret.secret; 2927 else 2928 return -1; 2929 2930 retry: 2931 spin_lock_bh(&lock); 2932 2933 sha_init(digest); 2934 memset(&data, 0, sizeof(data)); 2935 memset(workspace, 0, sizeof(workspace)); 2936 memcpy(data.hwaddr, idev->dev->perm_addr, idev->dev->addr_len); 2937 data.prefix[0] = address->s6_addr32[0]; 2938 data.prefix[1] = address->s6_addr32[1]; 2939 data.secret = secret; 2940 data.dad_count = dad_count; 2941 2942 sha_transform(digest, data.__data, workspace); 2943 2944 temp = *address; 2945 temp.s6_addr32[2] = (__force __be32)digest[0]; 2946 temp.s6_addr32[3] = (__force __be32)digest[1]; 2947 2948 spin_unlock_bh(&lock); 2949 2950 if (ipv6_reserved_interfaceid(temp)) { 2951 dad_count++; 2952 if (dad_count > dev_net(idev->dev)->ipv6.sysctl.idgen_retries) 2953 return -1; 2954 goto retry; 2955 } 2956 2957 *address = temp; 2958 return 0; 2959 } 2960 2961 static void addrconf_addr_gen(struct inet6_dev *idev, bool prefix_route) 2962 { 2963 struct in6_addr addr; 2964 2965 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0); 2966 2967 if (idev->addr_gen_mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY) { 2968 if (!ipv6_generate_stable_address(&addr, 0, idev)) 2969 addrconf_add_linklocal(idev, &addr, 2970 IFA_F_STABLE_PRIVACY); 2971 else if (prefix_route) 2972 addrconf_prefix_route(&addr, 64, idev->dev, 0, 0); 2973 } else if (idev->addr_gen_mode == IN6_ADDR_GEN_MODE_EUI64) { 2974 /* addrconf_add_linklocal also adds a prefix_route and we 2975 * only need to care about prefix routes if ipv6_generate_eui64 2976 * couldn't generate one. 2977 */ 2978 if (ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) == 0) 2979 addrconf_add_linklocal(idev, &addr, 0); 2980 else if (prefix_route) 2981 addrconf_prefix_route(&addr, 64, idev->dev, 0, 0); 2982 } 2983 } 2984 2985 static void addrconf_dev_config(struct net_device *dev) 2986 { 2987 struct inet6_dev *idev; 2988 2989 ASSERT_RTNL(); 2990 2991 if ((dev->type != ARPHRD_ETHER) && 2992 (dev->type != ARPHRD_FDDI) && 2993 (dev->type != ARPHRD_ARCNET) && 2994 (dev->type != ARPHRD_INFINIBAND) && 2995 (dev->type != ARPHRD_IEEE802154) && 2996 (dev->type != ARPHRD_IEEE1394) && 2997 (dev->type != ARPHRD_TUNNEL6) && 2998 (dev->type != ARPHRD_6LOWPAN)) { 2999 /* Alas, we support only Ethernet autoconfiguration. */ 3000 return; 3001 } 3002 3003 idev = addrconf_add_dev(dev); 3004 if (IS_ERR(idev)) 3005 return; 3006 3007 addrconf_addr_gen(idev, false); 3008 } 3009 3010 #if IS_ENABLED(CONFIG_IPV6_SIT) 3011 static void addrconf_sit_config(struct net_device *dev) 3012 { 3013 struct inet6_dev *idev; 3014 3015 ASSERT_RTNL(); 3016 3017 /* 3018 * Configure the tunnel with one of our IPv4 3019 * addresses... we should configure all of 3020 * our v4 addrs in the tunnel 3021 */ 3022 3023 idev = ipv6_find_idev(dev); 3024 if (!idev) { 3025 pr_debug("%s: add_dev failed\n", __func__); 3026 return; 3027 } 3028 3029 if (dev->priv_flags & IFF_ISATAP) { 3030 addrconf_addr_gen(idev, false); 3031 return; 3032 } 3033 3034 sit_add_v4_addrs(idev); 3035 3036 if (dev->flags&IFF_POINTOPOINT) 3037 addrconf_add_mroute(dev); 3038 } 3039 #endif 3040 3041 #if IS_ENABLED(CONFIG_NET_IPGRE) 3042 static void addrconf_gre_config(struct net_device *dev) 3043 { 3044 struct inet6_dev *idev; 3045 3046 ASSERT_RTNL(); 3047 3048 idev = ipv6_find_idev(dev); 3049 if (!idev) { 3050 pr_debug("%s: add_dev failed\n", __func__); 3051 return; 3052 } 3053 3054 addrconf_addr_gen(idev, true); 3055 } 3056 #endif 3057 3058 static int addrconf_notify(struct notifier_block *this, unsigned long event, 3059 void *ptr) 3060 { 3061 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 3062 struct inet6_dev *idev = __in6_dev_get(dev); 3063 int run_pending = 0; 3064 int err; 3065 3066 switch (event) { 3067 case NETDEV_REGISTER: 3068 if (!idev && dev->mtu >= IPV6_MIN_MTU) { 3069 idev = ipv6_add_dev(dev); 3070 if (IS_ERR(idev)) 3071 return notifier_from_errno(PTR_ERR(idev)); 3072 } 3073 break; 3074 3075 case NETDEV_UP: 3076 case NETDEV_CHANGE: 3077 if (dev->flags & IFF_SLAVE) 3078 break; 3079 3080 if (idev && idev->cnf.disable_ipv6) 3081 break; 3082 3083 if (event == NETDEV_UP) { 3084 if (!addrconf_qdisc_ok(dev)) { 3085 /* device is not ready yet. */ 3086 pr_info("ADDRCONF(NETDEV_UP): %s: link is not ready\n", 3087 dev->name); 3088 break; 3089 } 3090 3091 if (!idev && dev->mtu >= IPV6_MIN_MTU) 3092 idev = ipv6_add_dev(dev); 3093 3094 if (!IS_ERR_OR_NULL(idev)) { 3095 idev->if_flags |= IF_READY; 3096 run_pending = 1; 3097 } 3098 } else { 3099 if (!addrconf_qdisc_ok(dev)) { 3100 /* device is still not ready. */ 3101 break; 3102 } 3103 3104 if (idev) { 3105 if (idev->if_flags & IF_READY) 3106 /* device is already configured. */ 3107 break; 3108 idev->if_flags |= IF_READY; 3109 } 3110 3111 pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n", 3112 dev->name); 3113 3114 run_pending = 1; 3115 } 3116 3117 switch (dev->type) { 3118 #if IS_ENABLED(CONFIG_IPV6_SIT) 3119 case ARPHRD_SIT: 3120 addrconf_sit_config(dev); 3121 break; 3122 #endif 3123 #if IS_ENABLED(CONFIG_NET_IPGRE) 3124 case ARPHRD_IPGRE: 3125 addrconf_gre_config(dev); 3126 break; 3127 #endif 3128 case ARPHRD_LOOPBACK: 3129 init_loopback(dev); 3130 break; 3131 3132 default: 3133 addrconf_dev_config(dev); 3134 break; 3135 } 3136 3137 if (!IS_ERR_OR_NULL(idev)) { 3138 if (run_pending) 3139 addrconf_dad_run(idev); 3140 3141 /* 3142 * If the MTU changed during the interface down, 3143 * when the interface up, the changed MTU must be 3144 * reflected in the idev as well as routers. 3145 */ 3146 if (idev->cnf.mtu6 != dev->mtu && 3147 dev->mtu >= IPV6_MIN_MTU) { 3148 rt6_mtu_change(dev, dev->mtu); 3149 idev->cnf.mtu6 = dev->mtu; 3150 } 3151 idev->tstamp = jiffies; 3152 inet6_ifinfo_notify(RTM_NEWLINK, idev); 3153 3154 /* 3155 * If the changed mtu during down is lower than 3156 * IPV6_MIN_MTU stop IPv6 on this interface. 3157 */ 3158 if (dev->mtu < IPV6_MIN_MTU) 3159 addrconf_ifdown(dev, 1); 3160 } 3161 break; 3162 3163 case NETDEV_CHANGEMTU: 3164 if (idev && dev->mtu >= IPV6_MIN_MTU) { 3165 rt6_mtu_change(dev, dev->mtu); 3166 idev->cnf.mtu6 = dev->mtu; 3167 break; 3168 } 3169 3170 if (!idev && dev->mtu >= IPV6_MIN_MTU) { 3171 idev = ipv6_add_dev(dev); 3172 if (!IS_ERR(idev)) 3173 break; 3174 } 3175 3176 /* 3177 * if MTU under IPV6_MIN_MTU. 3178 * Stop IPv6 on this interface. 3179 */ 3180 3181 case NETDEV_DOWN: 3182 case NETDEV_UNREGISTER: 3183 /* 3184 * Remove all addresses from this interface. 3185 */ 3186 addrconf_ifdown(dev, event != NETDEV_DOWN); 3187 break; 3188 3189 case NETDEV_CHANGENAME: 3190 if (idev) { 3191 snmp6_unregister_dev(idev); 3192 addrconf_sysctl_unregister(idev); 3193 err = addrconf_sysctl_register(idev); 3194 if (err) 3195 return notifier_from_errno(err); 3196 err = snmp6_register_dev(idev); 3197 if (err) { 3198 addrconf_sysctl_unregister(idev); 3199 return notifier_from_errno(err); 3200 } 3201 } 3202 break; 3203 3204 case NETDEV_PRE_TYPE_CHANGE: 3205 case NETDEV_POST_TYPE_CHANGE: 3206 addrconf_type_change(dev, event); 3207 break; 3208 } 3209 3210 return NOTIFY_OK; 3211 } 3212 3213 /* 3214 * addrconf module should be notified of a device going up 3215 */ 3216 static struct notifier_block ipv6_dev_notf = { 3217 .notifier_call = addrconf_notify, 3218 }; 3219 3220 static void addrconf_type_change(struct net_device *dev, unsigned long event) 3221 { 3222 struct inet6_dev *idev; 3223 ASSERT_RTNL(); 3224 3225 idev = __in6_dev_get(dev); 3226 3227 if (event == NETDEV_POST_TYPE_CHANGE) 3228 ipv6_mc_remap(idev); 3229 else if (event == NETDEV_PRE_TYPE_CHANGE) 3230 ipv6_mc_unmap(idev); 3231 } 3232 3233 static int addrconf_ifdown(struct net_device *dev, int how) 3234 { 3235 struct net *net = dev_net(dev); 3236 struct inet6_dev *idev; 3237 struct inet6_ifaddr *ifa; 3238 int state, i; 3239 3240 ASSERT_RTNL(); 3241 3242 rt6_ifdown(net, dev); 3243 neigh_ifdown(&nd_tbl, dev); 3244 3245 idev = __in6_dev_get(dev); 3246 if (!idev) 3247 return -ENODEV; 3248 3249 /* 3250 * Step 1: remove reference to ipv6 device from parent device. 3251 * Do not dev_put! 3252 */ 3253 if (how) { 3254 idev->dead = 1; 3255 3256 /* protected by rtnl_lock */ 3257 RCU_INIT_POINTER(dev->ip6_ptr, NULL); 3258 3259 /* Step 1.5: remove snmp6 entry */ 3260 snmp6_unregister_dev(idev); 3261 3262 } 3263 3264 /* Step 2: clear hash table */ 3265 for (i = 0; i < IN6_ADDR_HSIZE; i++) { 3266 struct hlist_head *h = &inet6_addr_lst[i]; 3267 3268 spin_lock_bh(&addrconf_hash_lock); 3269 restart: 3270 hlist_for_each_entry_rcu(ifa, h, addr_lst) { 3271 if (ifa->idev == idev) { 3272 hlist_del_init_rcu(&ifa->addr_lst); 3273 addrconf_del_dad_work(ifa); 3274 goto restart; 3275 } 3276 } 3277 spin_unlock_bh(&addrconf_hash_lock); 3278 } 3279 3280 write_lock_bh(&idev->lock); 3281 3282 addrconf_del_rs_timer(idev); 3283 3284 /* Step 2: clear flags for stateless addrconf */ 3285 if (!how) 3286 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY); 3287 3288 if (how && del_timer(&idev->regen_timer)) 3289 in6_dev_put(idev); 3290 3291 /* Step 3: clear tempaddr list */ 3292 while (!list_empty(&idev->tempaddr_list)) { 3293 ifa = list_first_entry(&idev->tempaddr_list, 3294 struct inet6_ifaddr, tmp_list); 3295 list_del(&ifa->tmp_list); 3296 write_unlock_bh(&idev->lock); 3297 spin_lock_bh(&ifa->lock); 3298 3299 if (ifa->ifpub) { 3300 in6_ifa_put(ifa->ifpub); 3301 ifa->ifpub = NULL; 3302 } 3303 spin_unlock_bh(&ifa->lock); 3304 in6_ifa_put(ifa); 3305 write_lock_bh(&idev->lock); 3306 } 3307 3308 while (!list_empty(&idev->addr_list)) { 3309 ifa = list_first_entry(&idev->addr_list, 3310 struct inet6_ifaddr, if_list); 3311 addrconf_del_dad_work(ifa); 3312 3313 list_del(&ifa->if_list); 3314 3315 write_unlock_bh(&idev->lock); 3316 3317 spin_lock_bh(&ifa->lock); 3318 state = ifa->state; 3319 ifa->state = INET6_IFADDR_STATE_DEAD; 3320 spin_unlock_bh(&ifa->lock); 3321 3322 if (state != INET6_IFADDR_STATE_DEAD) { 3323 __ipv6_ifa_notify(RTM_DELADDR, ifa); 3324 inet6addr_notifier_call_chain(NETDEV_DOWN, ifa); 3325 } 3326 in6_ifa_put(ifa); 3327 3328 write_lock_bh(&idev->lock); 3329 } 3330 3331 write_unlock_bh(&idev->lock); 3332 3333 /* Step 5: Discard anycast and multicast list */ 3334 if (how) { 3335 ipv6_ac_destroy_dev(idev); 3336 ipv6_mc_destroy_dev(idev); 3337 } else { 3338 ipv6_mc_down(idev); 3339 } 3340 3341 idev->tstamp = jiffies; 3342 3343 /* Last: Shot the device (if unregistered) */ 3344 if (how) { 3345 addrconf_sysctl_unregister(idev); 3346 neigh_parms_release(&nd_tbl, idev->nd_parms); 3347 neigh_ifdown(&nd_tbl, dev); 3348 in6_dev_put(idev); 3349 } 3350 return 0; 3351 } 3352 3353 static void addrconf_rs_timer(unsigned long data) 3354 { 3355 struct inet6_dev *idev = (struct inet6_dev *)data; 3356 struct net_device *dev = idev->dev; 3357 struct in6_addr lladdr; 3358 3359 write_lock(&idev->lock); 3360 if (idev->dead || !(idev->if_flags & IF_READY)) 3361 goto out; 3362 3363 if (!ipv6_accept_ra(idev)) 3364 goto out; 3365 3366 /* Announcement received after solicitation was sent */ 3367 if (idev->if_flags & IF_RA_RCVD) 3368 goto out; 3369 3370 if (idev->rs_probes++ < idev->cnf.rtr_solicits) { 3371 write_unlock(&idev->lock); 3372 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE)) 3373 ndisc_send_rs(dev, &lladdr, 3374 &in6addr_linklocal_allrouters); 3375 else 3376 goto put; 3377 3378 write_lock(&idev->lock); 3379 /* The wait after the last probe can be shorter */ 3380 addrconf_mod_rs_timer(idev, (idev->rs_probes == 3381 idev->cnf.rtr_solicits) ? 3382 idev->cnf.rtr_solicit_delay : 3383 idev->cnf.rtr_solicit_interval); 3384 } else { 3385 /* 3386 * Note: we do not support deprecated "all on-link" 3387 * assumption any longer. 3388 */ 3389 pr_debug("%s: no IPv6 routers present\n", idev->dev->name); 3390 } 3391 3392 out: 3393 write_unlock(&idev->lock); 3394 put: 3395 in6_dev_put(idev); 3396 } 3397 3398 /* 3399 * Duplicate Address Detection 3400 */ 3401 static void addrconf_dad_kick(struct inet6_ifaddr *ifp) 3402 { 3403 unsigned long rand_num; 3404 struct inet6_dev *idev = ifp->idev; 3405 3406 if (ifp->flags & IFA_F_OPTIMISTIC) 3407 rand_num = 0; 3408 else 3409 rand_num = prandom_u32() % (idev->cnf.rtr_solicit_delay ? : 1); 3410 3411 ifp->dad_probes = idev->cnf.dad_transmits; 3412 addrconf_mod_dad_work(ifp, rand_num); 3413 } 3414 3415 static void addrconf_dad_begin(struct inet6_ifaddr *ifp) 3416 { 3417 struct inet6_dev *idev = ifp->idev; 3418 struct net_device *dev = idev->dev; 3419 3420 addrconf_join_solict(dev, &ifp->addr); 3421 3422 prandom_seed((__force u32) ifp->addr.s6_addr32[3]); 3423 3424 read_lock_bh(&idev->lock); 3425 spin_lock(&ifp->lock); 3426 if (ifp->state == INET6_IFADDR_STATE_DEAD) 3427 goto out; 3428 3429 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) || 3430 idev->cnf.accept_dad < 1 || 3431 !(ifp->flags&IFA_F_TENTATIVE) || 3432 ifp->flags & IFA_F_NODAD) { 3433 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED); 3434 spin_unlock(&ifp->lock); 3435 read_unlock_bh(&idev->lock); 3436 3437 addrconf_dad_completed(ifp); 3438 return; 3439 } 3440 3441 if (!(idev->if_flags & IF_READY)) { 3442 spin_unlock(&ifp->lock); 3443 read_unlock_bh(&idev->lock); 3444 /* 3445 * If the device is not ready: 3446 * - keep it tentative if it is a permanent address. 3447 * - otherwise, kill it. 3448 */ 3449 in6_ifa_hold(ifp); 3450 addrconf_dad_stop(ifp, 0); 3451 return; 3452 } 3453 3454 /* 3455 * Optimistic nodes can start receiving 3456 * Frames right away 3457 */ 3458 if (ifp->flags & IFA_F_OPTIMISTIC) { 3459 ip6_ins_rt(ifp->rt); 3460 if (ipv6_use_optimistic_addr(idev)) { 3461 /* Because optimistic nodes can use this address, 3462 * notify listeners. If DAD fails, RTM_DELADDR is sent. 3463 */ 3464 ipv6_ifa_notify(RTM_NEWADDR, ifp); 3465 } 3466 } 3467 3468 addrconf_dad_kick(ifp); 3469 out: 3470 spin_unlock(&ifp->lock); 3471 read_unlock_bh(&idev->lock); 3472 } 3473 3474 static void addrconf_dad_start(struct inet6_ifaddr *ifp) 3475 { 3476 bool begin_dad = false; 3477 3478 spin_lock_bh(&ifp->lock); 3479 if (ifp->state != INET6_IFADDR_STATE_DEAD) { 3480 ifp->state = INET6_IFADDR_STATE_PREDAD; 3481 begin_dad = true; 3482 } 3483 spin_unlock_bh(&ifp->lock); 3484 3485 if (begin_dad) 3486 addrconf_mod_dad_work(ifp, 0); 3487 } 3488 3489 static void addrconf_dad_work(struct work_struct *w) 3490 { 3491 struct inet6_ifaddr *ifp = container_of(to_delayed_work(w), 3492 struct inet6_ifaddr, 3493 dad_work); 3494 struct inet6_dev *idev = ifp->idev; 3495 struct in6_addr mcaddr; 3496 3497 enum { 3498 DAD_PROCESS, 3499 DAD_BEGIN, 3500 DAD_ABORT, 3501 } action = DAD_PROCESS; 3502 3503 rtnl_lock(); 3504 3505 spin_lock_bh(&ifp->lock); 3506 if (ifp->state == INET6_IFADDR_STATE_PREDAD) { 3507 action = DAD_BEGIN; 3508 ifp->state = INET6_IFADDR_STATE_DAD; 3509 } else if (ifp->state == INET6_IFADDR_STATE_ERRDAD) { 3510 action = DAD_ABORT; 3511 ifp->state = INET6_IFADDR_STATE_POSTDAD; 3512 } 3513 spin_unlock_bh(&ifp->lock); 3514 3515 if (action == DAD_BEGIN) { 3516 addrconf_dad_begin(ifp); 3517 goto out; 3518 } else if (action == DAD_ABORT) { 3519 addrconf_dad_stop(ifp, 1); 3520 goto out; 3521 } 3522 3523 if (!ifp->dad_probes && addrconf_dad_end(ifp)) 3524 goto out; 3525 3526 write_lock_bh(&idev->lock); 3527 if (idev->dead || !(idev->if_flags & IF_READY)) { 3528 write_unlock_bh(&idev->lock); 3529 goto out; 3530 } 3531 3532 spin_lock(&ifp->lock); 3533 if (ifp->state == INET6_IFADDR_STATE_DEAD) { 3534 spin_unlock(&ifp->lock); 3535 write_unlock_bh(&idev->lock); 3536 goto out; 3537 } 3538 3539 if (ifp->dad_probes == 0) { 3540 /* 3541 * DAD was successful 3542 */ 3543 3544 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED); 3545 spin_unlock(&ifp->lock); 3546 write_unlock_bh(&idev->lock); 3547 3548 addrconf_dad_completed(ifp); 3549 3550 goto out; 3551 } 3552 3553 ifp->dad_probes--; 3554 addrconf_mod_dad_work(ifp, 3555 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME)); 3556 spin_unlock(&ifp->lock); 3557 write_unlock_bh(&idev->lock); 3558 3559 /* send a neighbour solicitation for our addr */ 3560 addrconf_addr_solict_mult(&ifp->addr, &mcaddr); 3561 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &in6addr_any); 3562 out: 3563 in6_ifa_put(ifp); 3564 rtnl_unlock(); 3565 } 3566 3567 /* ifp->idev must be at least read locked */ 3568 static bool ipv6_lonely_lladdr(struct inet6_ifaddr *ifp) 3569 { 3570 struct inet6_ifaddr *ifpiter; 3571 struct inet6_dev *idev = ifp->idev; 3572 3573 list_for_each_entry_reverse(ifpiter, &idev->addr_list, if_list) { 3574 if (ifpiter->scope > IFA_LINK) 3575 break; 3576 if (ifp != ifpiter && ifpiter->scope == IFA_LINK && 3577 (ifpiter->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE| 3578 IFA_F_OPTIMISTIC|IFA_F_DADFAILED)) == 3579 IFA_F_PERMANENT) 3580 return false; 3581 } 3582 return true; 3583 } 3584 3585 static void addrconf_dad_completed(struct inet6_ifaddr *ifp) 3586 { 3587 struct net_device *dev = ifp->idev->dev; 3588 struct in6_addr lladdr; 3589 bool send_rs, send_mld; 3590 3591 addrconf_del_dad_work(ifp); 3592 3593 /* 3594 * Configure the address for reception. Now it is valid. 3595 */ 3596 3597 ipv6_ifa_notify(RTM_NEWADDR, ifp); 3598 3599 /* If added prefix is link local and we are prepared to process 3600 router advertisements, start sending router solicitations. 3601 */ 3602 3603 read_lock_bh(&ifp->idev->lock); 3604 send_mld = ifp->scope == IFA_LINK && ipv6_lonely_lladdr(ifp); 3605 send_rs = send_mld && 3606 ipv6_accept_ra(ifp->idev) && 3607 ifp->idev->cnf.rtr_solicits > 0 && 3608 (dev->flags&IFF_LOOPBACK) == 0; 3609 read_unlock_bh(&ifp->idev->lock); 3610 3611 /* While dad is in progress mld report's source address is in6_addrany. 3612 * Resend with proper ll now. 3613 */ 3614 if (send_mld) 3615 ipv6_mc_dad_complete(ifp->idev); 3616 3617 if (send_rs) { 3618 /* 3619 * If a host as already performed a random delay 3620 * [...] as part of DAD [...] there is no need 3621 * to delay again before sending the first RS 3622 */ 3623 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE)) 3624 return; 3625 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters); 3626 3627 write_lock_bh(&ifp->idev->lock); 3628 spin_lock(&ifp->lock); 3629 ifp->idev->rs_probes = 1; 3630 ifp->idev->if_flags |= IF_RS_SENT; 3631 addrconf_mod_rs_timer(ifp->idev, 3632 ifp->idev->cnf.rtr_solicit_interval); 3633 spin_unlock(&ifp->lock); 3634 write_unlock_bh(&ifp->idev->lock); 3635 } 3636 } 3637 3638 static void addrconf_dad_run(struct inet6_dev *idev) 3639 { 3640 struct inet6_ifaddr *ifp; 3641 3642 read_lock_bh(&idev->lock); 3643 list_for_each_entry(ifp, &idev->addr_list, if_list) { 3644 spin_lock(&ifp->lock); 3645 if (ifp->flags & IFA_F_TENTATIVE && 3646 ifp->state == INET6_IFADDR_STATE_DAD) 3647 addrconf_dad_kick(ifp); 3648 spin_unlock(&ifp->lock); 3649 } 3650 read_unlock_bh(&idev->lock); 3651 } 3652 3653 #ifdef CONFIG_PROC_FS 3654 struct if6_iter_state { 3655 struct seq_net_private p; 3656 int bucket; 3657 int offset; 3658 }; 3659 3660 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos) 3661 { 3662 struct inet6_ifaddr *ifa = NULL; 3663 struct if6_iter_state *state = seq->private; 3664 struct net *net = seq_file_net(seq); 3665 int p = 0; 3666 3667 /* initial bucket if pos is 0 */ 3668 if (pos == 0) { 3669 state->bucket = 0; 3670 state->offset = 0; 3671 } 3672 3673 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) { 3674 hlist_for_each_entry_rcu_bh(ifa, &inet6_addr_lst[state->bucket], 3675 addr_lst) { 3676 if (!net_eq(dev_net(ifa->idev->dev), net)) 3677 continue; 3678 /* sync with offset */ 3679 if (p < state->offset) { 3680 p++; 3681 continue; 3682 } 3683 state->offset++; 3684 return ifa; 3685 } 3686 3687 /* prepare for next bucket */ 3688 state->offset = 0; 3689 p = 0; 3690 } 3691 return NULL; 3692 } 3693 3694 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, 3695 struct inet6_ifaddr *ifa) 3696 { 3697 struct if6_iter_state *state = seq->private; 3698 struct net *net = seq_file_net(seq); 3699 3700 hlist_for_each_entry_continue_rcu_bh(ifa, addr_lst) { 3701 if (!net_eq(dev_net(ifa->idev->dev), net)) 3702 continue; 3703 state->offset++; 3704 return ifa; 3705 } 3706 3707 while (++state->bucket < IN6_ADDR_HSIZE) { 3708 state->offset = 0; 3709 hlist_for_each_entry_rcu_bh(ifa, 3710 &inet6_addr_lst[state->bucket], addr_lst) { 3711 if (!net_eq(dev_net(ifa->idev->dev), net)) 3712 continue; 3713 state->offset++; 3714 return ifa; 3715 } 3716 } 3717 3718 return NULL; 3719 } 3720 3721 static void *if6_seq_start(struct seq_file *seq, loff_t *pos) 3722 __acquires(rcu_bh) 3723 { 3724 rcu_read_lock_bh(); 3725 return if6_get_first(seq, *pos); 3726 } 3727 3728 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos) 3729 { 3730 struct inet6_ifaddr *ifa; 3731 3732 ifa = if6_get_next(seq, v); 3733 ++*pos; 3734 return ifa; 3735 } 3736 3737 static void if6_seq_stop(struct seq_file *seq, void *v) 3738 __releases(rcu_bh) 3739 { 3740 rcu_read_unlock_bh(); 3741 } 3742 3743 static int if6_seq_show(struct seq_file *seq, void *v) 3744 { 3745 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v; 3746 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n", 3747 &ifp->addr, 3748 ifp->idev->dev->ifindex, 3749 ifp->prefix_len, 3750 ifp->scope, 3751 (u8) ifp->flags, 3752 ifp->idev->dev->name); 3753 return 0; 3754 } 3755 3756 static const struct seq_operations if6_seq_ops = { 3757 .start = if6_seq_start, 3758 .next = if6_seq_next, 3759 .show = if6_seq_show, 3760 .stop = if6_seq_stop, 3761 }; 3762 3763 static int if6_seq_open(struct inode *inode, struct file *file) 3764 { 3765 return seq_open_net(inode, file, &if6_seq_ops, 3766 sizeof(struct if6_iter_state)); 3767 } 3768 3769 static const struct file_operations if6_fops = { 3770 .owner = THIS_MODULE, 3771 .open = if6_seq_open, 3772 .read = seq_read, 3773 .llseek = seq_lseek, 3774 .release = seq_release_net, 3775 }; 3776 3777 static int __net_init if6_proc_net_init(struct net *net) 3778 { 3779 if (!proc_create("if_inet6", S_IRUGO, net->proc_net, &if6_fops)) 3780 return -ENOMEM; 3781 return 0; 3782 } 3783 3784 static void __net_exit if6_proc_net_exit(struct net *net) 3785 { 3786 remove_proc_entry("if_inet6", net->proc_net); 3787 } 3788 3789 static struct pernet_operations if6_proc_net_ops = { 3790 .init = if6_proc_net_init, 3791 .exit = if6_proc_net_exit, 3792 }; 3793 3794 int __init if6_proc_init(void) 3795 { 3796 return register_pernet_subsys(&if6_proc_net_ops); 3797 } 3798 3799 void if6_proc_exit(void) 3800 { 3801 unregister_pernet_subsys(&if6_proc_net_ops); 3802 } 3803 #endif /* CONFIG_PROC_FS */ 3804 3805 #if IS_ENABLED(CONFIG_IPV6_MIP6) 3806 /* Check if address is a home address configured on any interface. */ 3807 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr) 3808 { 3809 int ret = 0; 3810 struct inet6_ifaddr *ifp = NULL; 3811 unsigned int hash = inet6_addr_hash(addr); 3812 3813 rcu_read_lock_bh(); 3814 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) { 3815 if (!net_eq(dev_net(ifp->idev->dev), net)) 3816 continue; 3817 if (ipv6_addr_equal(&ifp->addr, addr) && 3818 (ifp->flags & IFA_F_HOMEADDRESS)) { 3819 ret = 1; 3820 break; 3821 } 3822 } 3823 rcu_read_unlock_bh(); 3824 return ret; 3825 } 3826 #endif 3827 3828 /* 3829 * Periodic address status verification 3830 */ 3831 3832 static void addrconf_verify_rtnl(void) 3833 { 3834 unsigned long now, next, next_sec, next_sched; 3835 struct inet6_ifaddr *ifp; 3836 int i; 3837 3838 ASSERT_RTNL(); 3839 3840 rcu_read_lock_bh(); 3841 now = jiffies; 3842 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY); 3843 3844 cancel_delayed_work(&addr_chk_work); 3845 3846 for (i = 0; i < IN6_ADDR_HSIZE; i++) { 3847 restart: 3848 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[i], addr_lst) { 3849 unsigned long age; 3850 3851 /* When setting preferred_lft to a value not zero or 3852 * infinity, while valid_lft is infinity 3853 * IFA_F_PERMANENT has a non-infinity life time. 3854 */ 3855 if ((ifp->flags & IFA_F_PERMANENT) && 3856 (ifp->prefered_lft == INFINITY_LIFE_TIME)) 3857 continue; 3858 3859 spin_lock(&ifp->lock); 3860 /* We try to batch several events at once. */ 3861 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ; 3862 3863 if (ifp->valid_lft != INFINITY_LIFE_TIME && 3864 age >= ifp->valid_lft) { 3865 spin_unlock(&ifp->lock); 3866 in6_ifa_hold(ifp); 3867 ipv6_del_addr(ifp); 3868 goto restart; 3869 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) { 3870 spin_unlock(&ifp->lock); 3871 continue; 3872 } else if (age >= ifp->prefered_lft) { 3873 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */ 3874 int deprecate = 0; 3875 3876 if (!(ifp->flags&IFA_F_DEPRECATED)) { 3877 deprecate = 1; 3878 ifp->flags |= IFA_F_DEPRECATED; 3879 } 3880 3881 if ((ifp->valid_lft != INFINITY_LIFE_TIME) && 3882 (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))) 3883 next = ifp->tstamp + ifp->valid_lft * HZ; 3884 3885 spin_unlock(&ifp->lock); 3886 3887 if (deprecate) { 3888 in6_ifa_hold(ifp); 3889 3890 ipv6_ifa_notify(0, ifp); 3891 in6_ifa_put(ifp); 3892 goto restart; 3893 } 3894 } else if ((ifp->flags&IFA_F_TEMPORARY) && 3895 !(ifp->flags&IFA_F_TENTATIVE)) { 3896 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry * 3897 ifp->idev->cnf.dad_transmits * 3898 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME) / HZ; 3899 3900 if (age >= ifp->prefered_lft - regen_advance) { 3901 struct inet6_ifaddr *ifpub = ifp->ifpub; 3902 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 3903 next = ifp->tstamp + ifp->prefered_lft * HZ; 3904 if (!ifp->regen_count && ifpub) { 3905 ifp->regen_count++; 3906 in6_ifa_hold(ifp); 3907 in6_ifa_hold(ifpub); 3908 spin_unlock(&ifp->lock); 3909 3910 spin_lock(&ifpub->lock); 3911 ifpub->regen_count = 0; 3912 spin_unlock(&ifpub->lock); 3913 ipv6_create_tempaddr(ifpub, ifp); 3914 in6_ifa_put(ifpub); 3915 in6_ifa_put(ifp); 3916 goto restart; 3917 } 3918 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next)) 3919 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ; 3920 spin_unlock(&ifp->lock); 3921 } else { 3922 /* ifp->prefered_lft <= ifp->valid_lft */ 3923 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 3924 next = ifp->tstamp + ifp->prefered_lft * HZ; 3925 spin_unlock(&ifp->lock); 3926 } 3927 } 3928 } 3929 3930 next_sec = round_jiffies_up(next); 3931 next_sched = next; 3932 3933 /* If rounded timeout is accurate enough, accept it. */ 3934 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ)) 3935 next_sched = next_sec; 3936 3937 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */ 3938 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX)) 3939 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX; 3940 3941 ADBG(KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n", 3942 now, next, next_sec, next_sched); 3943 mod_delayed_work(addrconf_wq, &addr_chk_work, next_sched - now); 3944 rcu_read_unlock_bh(); 3945 } 3946 3947 static void addrconf_verify_work(struct work_struct *w) 3948 { 3949 rtnl_lock(); 3950 addrconf_verify_rtnl(); 3951 rtnl_unlock(); 3952 } 3953 3954 static void addrconf_verify(void) 3955 { 3956 mod_delayed_work(addrconf_wq, &addr_chk_work, 0); 3957 } 3958 3959 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local, 3960 struct in6_addr **peer_pfx) 3961 { 3962 struct in6_addr *pfx = NULL; 3963 3964 *peer_pfx = NULL; 3965 3966 if (addr) 3967 pfx = nla_data(addr); 3968 3969 if (local) { 3970 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx))) 3971 *peer_pfx = pfx; 3972 pfx = nla_data(local); 3973 } 3974 3975 return pfx; 3976 } 3977 3978 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = { 3979 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) }, 3980 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) }, 3981 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) }, 3982 [IFA_FLAGS] = { .len = sizeof(u32) }, 3983 }; 3984 3985 static int 3986 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh) 3987 { 3988 struct net *net = sock_net(skb->sk); 3989 struct ifaddrmsg *ifm; 3990 struct nlattr *tb[IFA_MAX+1]; 3991 struct in6_addr *pfx, *peer_pfx; 3992 u32 ifa_flags; 3993 int err; 3994 3995 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy); 3996 if (err < 0) 3997 return err; 3998 3999 ifm = nlmsg_data(nlh); 4000 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx); 4001 if (!pfx) 4002 return -EINVAL; 4003 4004 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags; 4005 4006 /* We ignore other flags so far. */ 4007 ifa_flags &= IFA_F_MANAGETEMPADDR; 4008 4009 return inet6_addr_del(net, ifm->ifa_index, ifa_flags, pfx, 4010 ifm->ifa_prefixlen); 4011 } 4012 4013 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u32 ifa_flags, 4014 u32 prefered_lft, u32 valid_lft) 4015 { 4016 u32 flags; 4017 clock_t expires; 4018 unsigned long timeout; 4019 bool was_managetempaddr; 4020 bool had_prefixroute; 4021 4022 ASSERT_RTNL(); 4023 4024 if (!valid_lft || (prefered_lft > valid_lft)) 4025 return -EINVAL; 4026 4027 if (ifa_flags & IFA_F_MANAGETEMPADDR && 4028 (ifp->flags & IFA_F_TEMPORARY || ifp->prefix_len != 64)) 4029 return -EINVAL; 4030 4031 timeout = addrconf_timeout_fixup(valid_lft, HZ); 4032 if (addrconf_finite_timeout(timeout)) { 4033 expires = jiffies_to_clock_t(timeout * HZ); 4034 valid_lft = timeout; 4035 flags = RTF_EXPIRES; 4036 } else { 4037 expires = 0; 4038 flags = 0; 4039 ifa_flags |= IFA_F_PERMANENT; 4040 } 4041 4042 timeout = addrconf_timeout_fixup(prefered_lft, HZ); 4043 if (addrconf_finite_timeout(timeout)) { 4044 if (timeout == 0) 4045 ifa_flags |= IFA_F_DEPRECATED; 4046 prefered_lft = timeout; 4047 } 4048 4049 spin_lock_bh(&ifp->lock); 4050 was_managetempaddr = ifp->flags & IFA_F_MANAGETEMPADDR; 4051 had_prefixroute = ifp->flags & IFA_F_PERMANENT && 4052 !(ifp->flags & IFA_F_NOPREFIXROUTE); 4053 ifp->flags &= ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | 4054 IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR | 4055 IFA_F_NOPREFIXROUTE); 4056 ifp->flags |= ifa_flags; 4057 ifp->tstamp = jiffies; 4058 ifp->valid_lft = valid_lft; 4059 ifp->prefered_lft = prefered_lft; 4060 4061 spin_unlock_bh(&ifp->lock); 4062 if (!(ifp->flags&IFA_F_TENTATIVE)) 4063 ipv6_ifa_notify(0, ifp); 4064 4065 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) { 4066 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev, 4067 expires, flags); 4068 } else if (had_prefixroute) { 4069 enum cleanup_prefix_rt_t action; 4070 unsigned long rt_expires; 4071 4072 write_lock_bh(&ifp->idev->lock); 4073 action = check_cleanup_prefix_route(ifp, &rt_expires); 4074 write_unlock_bh(&ifp->idev->lock); 4075 4076 if (action != CLEANUP_PREFIX_RT_NOP) { 4077 cleanup_prefix_route(ifp, rt_expires, 4078 action == CLEANUP_PREFIX_RT_DEL); 4079 } 4080 } 4081 4082 if (was_managetempaddr || ifp->flags & IFA_F_MANAGETEMPADDR) { 4083 if (was_managetempaddr && !(ifp->flags & IFA_F_MANAGETEMPADDR)) 4084 valid_lft = prefered_lft = 0; 4085 manage_tempaddrs(ifp->idev, ifp, valid_lft, prefered_lft, 4086 !was_managetempaddr, jiffies); 4087 } 4088 4089 addrconf_verify_rtnl(); 4090 4091 return 0; 4092 } 4093 4094 static int 4095 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh) 4096 { 4097 struct net *net = sock_net(skb->sk); 4098 struct ifaddrmsg *ifm; 4099 struct nlattr *tb[IFA_MAX+1]; 4100 struct in6_addr *pfx, *peer_pfx; 4101 struct inet6_ifaddr *ifa; 4102 struct net_device *dev; 4103 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME; 4104 u32 ifa_flags; 4105 int err; 4106 4107 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy); 4108 if (err < 0) 4109 return err; 4110 4111 ifm = nlmsg_data(nlh); 4112 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx); 4113 if (!pfx) 4114 return -EINVAL; 4115 4116 if (tb[IFA_CACHEINFO]) { 4117 struct ifa_cacheinfo *ci; 4118 4119 ci = nla_data(tb[IFA_CACHEINFO]); 4120 valid_lft = ci->ifa_valid; 4121 preferred_lft = ci->ifa_prefered; 4122 } else { 4123 preferred_lft = INFINITY_LIFE_TIME; 4124 valid_lft = INFINITY_LIFE_TIME; 4125 } 4126 4127 dev = __dev_get_by_index(net, ifm->ifa_index); 4128 if (!dev) 4129 return -ENODEV; 4130 4131 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags; 4132 4133 /* We ignore other flags so far. */ 4134 ifa_flags &= IFA_F_NODAD | IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR | 4135 IFA_F_NOPREFIXROUTE | IFA_F_MCAUTOJOIN; 4136 4137 ifa = ipv6_get_ifaddr(net, pfx, dev, 1); 4138 if (!ifa) { 4139 /* 4140 * It would be best to check for !NLM_F_CREATE here but 4141 * userspace already relies on not having to provide this. 4142 */ 4143 return inet6_addr_add(net, ifm->ifa_index, pfx, peer_pfx, 4144 ifm->ifa_prefixlen, ifa_flags, 4145 preferred_lft, valid_lft); 4146 } 4147 4148 if (nlh->nlmsg_flags & NLM_F_EXCL || 4149 !(nlh->nlmsg_flags & NLM_F_REPLACE)) 4150 err = -EEXIST; 4151 else 4152 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft); 4153 4154 in6_ifa_put(ifa); 4155 4156 return err; 4157 } 4158 4159 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u32 flags, 4160 u8 scope, int ifindex) 4161 { 4162 struct ifaddrmsg *ifm; 4163 4164 ifm = nlmsg_data(nlh); 4165 ifm->ifa_family = AF_INET6; 4166 ifm->ifa_prefixlen = prefixlen; 4167 ifm->ifa_flags = flags; 4168 ifm->ifa_scope = scope; 4169 ifm->ifa_index = ifindex; 4170 } 4171 4172 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp, 4173 unsigned long tstamp, u32 preferred, u32 valid) 4174 { 4175 struct ifa_cacheinfo ci; 4176 4177 ci.cstamp = cstamp_delta(cstamp); 4178 ci.tstamp = cstamp_delta(tstamp); 4179 ci.ifa_prefered = preferred; 4180 ci.ifa_valid = valid; 4181 4182 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci); 4183 } 4184 4185 static inline int rt_scope(int ifa_scope) 4186 { 4187 if (ifa_scope & IFA_HOST) 4188 return RT_SCOPE_HOST; 4189 else if (ifa_scope & IFA_LINK) 4190 return RT_SCOPE_LINK; 4191 else if (ifa_scope & IFA_SITE) 4192 return RT_SCOPE_SITE; 4193 else 4194 return RT_SCOPE_UNIVERSE; 4195 } 4196 4197 static inline int inet6_ifaddr_msgsize(void) 4198 { 4199 return NLMSG_ALIGN(sizeof(struct ifaddrmsg)) 4200 + nla_total_size(16) /* IFA_LOCAL */ 4201 + nla_total_size(16) /* IFA_ADDRESS */ 4202 + nla_total_size(sizeof(struct ifa_cacheinfo)) 4203 + nla_total_size(4) /* IFA_FLAGS */; 4204 } 4205 4206 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa, 4207 u32 portid, u32 seq, int event, unsigned int flags) 4208 { 4209 struct nlmsghdr *nlh; 4210 u32 preferred, valid; 4211 4212 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags); 4213 if (!nlh) 4214 return -EMSGSIZE; 4215 4216 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope), 4217 ifa->idev->dev->ifindex); 4218 4219 if (!((ifa->flags&IFA_F_PERMANENT) && 4220 (ifa->prefered_lft == INFINITY_LIFE_TIME))) { 4221 preferred = ifa->prefered_lft; 4222 valid = ifa->valid_lft; 4223 if (preferred != INFINITY_LIFE_TIME) { 4224 long tval = (jiffies - ifa->tstamp)/HZ; 4225 if (preferred > tval) 4226 preferred -= tval; 4227 else 4228 preferred = 0; 4229 if (valid != INFINITY_LIFE_TIME) { 4230 if (valid > tval) 4231 valid -= tval; 4232 else 4233 valid = 0; 4234 } 4235 } 4236 } else { 4237 preferred = INFINITY_LIFE_TIME; 4238 valid = INFINITY_LIFE_TIME; 4239 } 4240 4241 if (!ipv6_addr_any(&ifa->peer_addr)) { 4242 if (nla_put_in6_addr(skb, IFA_LOCAL, &ifa->addr) < 0 || 4243 nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->peer_addr) < 0) 4244 goto error; 4245 } else 4246 if (nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->addr) < 0) 4247 goto error; 4248 4249 if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) 4250 goto error; 4251 4252 if (nla_put_u32(skb, IFA_FLAGS, ifa->flags) < 0) 4253 goto error; 4254 4255 nlmsg_end(skb, nlh); 4256 return 0; 4257 4258 error: 4259 nlmsg_cancel(skb, nlh); 4260 return -EMSGSIZE; 4261 } 4262 4263 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca, 4264 u32 portid, u32 seq, int event, u16 flags) 4265 { 4266 struct nlmsghdr *nlh; 4267 u8 scope = RT_SCOPE_UNIVERSE; 4268 int ifindex = ifmca->idev->dev->ifindex; 4269 4270 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE) 4271 scope = RT_SCOPE_SITE; 4272 4273 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags); 4274 if (!nlh) 4275 return -EMSGSIZE; 4276 4277 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 4278 if (nla_put_in6_addr(skb, IFA_MULTICAST, &ifmca->mca_addr) < 0 || 4279 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp, 4280 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 4281 nlmsg_cancel(skb, nlh); 4282 return -EMSGSIZE; 4283 } 4284 4285 nlmsg_end(skb, nlh); 4286 return 0; 4287 } 4288 4289 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca, 4290 u32 portid, u32 seq, int event, unsigned int flags) 4291 { 4292 struct nlmsghdr *nlh; 4293 u8 scope = RT_SCOPE_UNIVERSE; 4294 int ifindex = ifaca->aca_idev->dev->ifindex; 4295 4296 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE) 4297 scope = RT_SCOPE_SITE; 4298 4299 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags); 4300 if (!nlh) 4301 return -EMSGSIZE; 4302 4303 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 4304 if (nla_put_in6_addr(skb, IFA_ANYCAST, &ifaca->aca_addr) < 0 || 4305 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp, 4306 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 4307 nlmsg_cancel(skb, nlh); 4308 return -EMSGSIZE; 4309 } 4310 4311 nlmsg_end(skb, nlh); 4312 return 0; 4313 } 4314 4315 enum addr_type_t { 4316 UNICAST_ADDR, 4317 MULTICAST_ADDR, 4318 ANYCAST_ADDR, 4319 }; 4320 4321 /* called with rcu_read_lock() */ 4322 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb, 4323 struct netlink_callback *cb, enum addr_type_t type, 4324 int s_ip_idx, int *p_ip_idx) 4325 { 4326 struct ifmcaddr6 *ifmca; 4327 struct ifacaddr6 *ifaca; 4328 int err = 1; 4329 int ip_idx = *p_ip_idx; 4330 4331 read_lock_bh(&idev->lock); 4332 switch (type) { 4333 case UNICAST_ADDR: { 4334 struct inet6_ifaddr *ifa; 4335 4336 /* unicast address incl. temp addr */ 4337 list_for_each_entry(ifa, &idev->addr_list, if_list) { 4338 if (++ip_idx < s_ip_idx) 4339 continue; 4340 err = inet6_fill_ifaddr(skb, ifa, 4341 NETLINK_CB(cb->skb).portid, 4342 cb->nlh->nlmsg_seq, 4343 RTM_NEWADDR, 4344 NLM_F_MULTI); 4345 if (err < 0) 4346 break; 4347 nl_dump_check_consistent(cb, nlmsg_hdr(skb)); 4348 } 4349 break; 4350 } 4351 case MULTICAST_ADDR: 4352 /* multicast address */ 4353 for (ifmca = idev->mc_list; ifmca; 4354 ifmca = ifmca->next, ip_idx++) { 4355 if (ip_idx < s_ip_idx) 4356 continue; 4357 err = inet6_fill_ifmcaddr(skb, ifmca, 4358 NETLINK_CB(cb->skb).portid, 4359 cb->nlh->nlmsg_seq, 4360 RTM_GETMULTICAST, 4361 NLM_F_MULTI); 4362 if (err < 0) 4363 break; 4364 } 4365 break; 4366 case ANYCAST_ADDR: 4367 /* anycast address */ 4368 for (ifaca = idev->ac_list; ifaca; 4369 ifaca = ifaca->aca_next, ip_idx++) { 4370 if (ip_idx < s_ip_idx) 4371 continue; 4372 err = inet6_fill_ifacaddr(skb, ifaca, 4373 NETLINK_CB(cb->skb).portid, 4374 cb->nlh->nlmsg_seq, 4375 RTM_GETANYCAST, 4376 NLM_F_MULTI); 4377 if (err < 0) 4378 break; 4379 } 4380 break; 4381 default: 4382 break; 4383 } 4384 read_unlock_bh(&idev->lock); 4385 *p_ip_idx = ip_idx; 4386 return err; 4387 } 4388 4389 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb, 4390 enum addr_type_t type) 4391 { 4392 struct net *net = sock_net(skb->sk); 4393 int h, s_h; 4394 int idx, ip_idx; 4395 int s_idx, s_ip_idx; 4396 struct net_device *dev; 4397 struct inet6_dev *idev; 4398 struct hlist_head *head; 4399 4400 s_h = cb->args[0]; 4401 s_idx = idx = cb->args[1]; 4402 s_ip_idx = ip_idx = cb->args[2]; 4403 4404 rcu_read_lock(); 4405 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ net->dev_base_seq; 4406 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 4407 idx = 0; 4408 head = &net->dev_index_head[h]; 4409 hlist_for_each_entry_rcu(dev, head, index_hlist) { 4410 if (idx < s_idx) 4411 goto cont; 4412 if (h > s_h || idx > s_idx) 4413 s_ip_idx = 0; 4414 ip_idx = 0; 4415 idev = __in6_dev_get(dev); 4416 if (!idev) 4417 goto cont; 4418 4419 if (in6_dump_addrs(idev, skb, cb, type, 4420 s_ip_idx, &ip_idx) < 0) 4421 goto done; 4422 cont: 4423 idx++; 4424 } 4425 } 4426 done: 4427 rcu_read_unlock(); 4428 cb->args[0] = h; 4429 cb->args[1] = idx; 4430 cb->args[2] = ip_idx; 4431 4432 return skb->len; 4433 } 4434 4435 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb) 4436 { 4437 enum addr_type_t type = UNICAST_ADDR; 4438 4439 return inet6_dump_addr(skb, cb, type); 4440 } 4441 4442 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb) 4443 { 4444 enum addr_type_t type = MULTICAST_ADDR; 4445 4446 return inet6_dump_addr(skb, cb, type); 4447 } 4448 4449 4450 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb) 4451 { 4452 enum addr_type_t type = ANYCAST_ADDR; 4453 4454 return inet6_dump_addr(skb, cb, type); 4455 } 4456 4457 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh) 4458 { 4459 struct net *net = sock_net(in_skb->sk); 4460 struct ifaddrmsg *ifm; 4461 struct nlattr *tb[IFA_MAX+1]; 4462 struct in6_addr *addr = NULL, *peer; 4463 struct net_device *dev = NULL; 4464 struct inet6_ifaddr *ifa; 4465 struct sk_buff *skb; 4466 int err; 4467 4468 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy); 4469 if (err < 0) 4470 goto errout; 4471 4472 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer); 4473 if (!addr) { 4474 err = -EINVAL; 4475 goto errout; 4476 } 4477 4478 ifm = nlmsg_data(nlh); 4479 if (ifm->ifa_index) 4480 dev = __dev_get_by_index(net, ifm->ifa_index); 4481 4482 ifa = ipv6_get_ifaddr(net, addr, dev, 1); 4483 if (!ifa) { 4484 err = -EADDRNOTAVAIL; 4485 goto errout; 4486 } 4487 4488 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL); 4489 if (!skb) { 4490 err = -ENOBUFS; 4491 goto errout_ifa; 4492 } 4493 4494 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).portid, 4495 nlh->nlmsg_seq, RTM_NEWADDR, 0); 4496 if (err < 0) { 4497 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 4498 WARN_ON(err == -EMSGSIZE); 4499 kfree_skb(skb); 4500 goto errout_ifa; 4501 } 4502 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid); 4503 errout_ifa: 4504 in6_ifa_put(ifa); 4505 errout: 4506 return err; 4507 } 4508 4509 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa) 4510 { 4511 struct sk_buff *skb; 4512 struct net *net = dev_net(ifa->idev->dev); 4513 int err = -ENOBUFS; 4514 4515 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC); 4516 if (!skb) 4517 goto errout; 4518 4519 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0); 4520 if (err < 0) { 4521 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 4522 WARN_ON(err == -EMSGSIZE); 4523 kfree_skb(skb); 4524 goto errout; 4525 } 4526 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC); 4527 return; 4528 errout: 4529 if (err < 0) 4530 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err); 4531 } 4532 4533 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf, 4534 __s32 *array, int bytes) 4535 { 4536 BUG_ON(bytes < (DEVCONF_MAX * 4)); 4537 4538 memset(array, 0, bytes); 4539 array[DEVCONF_FORWARDING] = cnf->forwarding; 4540 array[DEVCONF_HOPLIMIT] = cnf->hop_limit; 4541 array[DEVCONF_MTU6] = cnf->mtu6; 4542 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra; 4543 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects; 4544 array[DEVCONF_AUTOCONF] = cnf->autoconf; 4545 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits; 4546 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits; 4547 array[DEVCONF_RTR_SOLICIT_INTERVAL] = 4548 jiffies_to_msecs(cnf->rtr_solicit_interval); 4549 array[DEVCONF_RTR_SOLICIT_DELAY] = 4550 jiffies_to_msecs(cnf->rtr_solicit_delay); 4551 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version; 4552 array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] = 4553 jiffies_to_msecs(cnf->mldv1_unsolicited_report_interval); 4554 array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] = 4555 jiffies_to_msecs(cnf->mldv2_unsolicited_report_interval); 4556 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr; 4557 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft; 4558 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft; 4559 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry; 4560 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor; 4561 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses; 4562 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr; 4563 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo; 4564 #ifdef CONFIG_IPV6_ROUTER_PREF 4565 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref; 4566 array[DEVCONF_RTR_PROBE_INTERVAL] = 4567 jiffies_to_msecs(cnf->rtr_probe_interval); 4568 #ifdef CONFIG_IPV6_ROUTE_INFO 4569 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen; 4570 #endif 4571 #endif 4572 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp; 4573 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route; 4574 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 4575 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad; 4576 array[DEVCONF_USE_OPTIMISTIC] = cnf->use_optimistic; 4577 #endif 4578 #ifdef CONFIG_IPV6_MROUTE 4579 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding; 4580 #endif 4581 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6; 4582 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad; 4583 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao; 4584 array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify; 4585 array[DEVCONF_SUPPRESS_FRAG_NDISC] = cnf->suppress_frag_ndisc; 4586 array[DEVCONF_ACCEPT_RA_FROM_LOCAL] = cnf->accept_ra_from_local; 4587 array[DEVCONF_ACCEPT_RA_MTU] = cnf->accept_ra_mtu; 4588 /* we omit DEVCONF_STABLE_SECRET for now */ 4589 } 4590 4591 static inline size_t inet6_ifla6_size(void) 4592 { 4593 return nla_total_size(4) /* IFLA_INET6_FLAGS */ 4594 + nla_total_size(sizeof(struct ifla_cacheinfo)) 4595 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */ 4596 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */ 4597 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */ 4598 + nla_total_size(sizeof(struct in6_addr)); /* IFLA_INET6_TOKEN */ 4599 } 4600 4601 static inline size_t inet6_if_nlmsg_size(void) 4602 { 4603 return NLMSG_ALIGN(sizeof(struct ifinfomsg)) 4604 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */ 4605 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */ 4606 + nla_total_size(4) /* IFLA_MTU */ 4607 + nla_total_size(4) /* IFLA_LINK */ 4608 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */ 4609 } 4610 4611 static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib, 4612 int items, int bytes) 4613 { 4614 int i; 4615 int pad = bytes - sizeof(u64) * items; 4616 BUG_ON(pad < 0); 4617 4618 /* Use put_unaligned() because stats may not be aligned for u64. */ 4619 put_unaligned(items, &stats[0]); 4620 for (i = 1; i < items; i++) 4621 put_unaligned(atomic_long_read(&mib[i]), &stats[i]); 4622 4623 memset(&stats[items], 0, pad); 4624 } 4625 4626 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu *mib, 4627 int items, int bytes, size_t syncpoff) 4628 { 4629 int i; 4630 int pad = bytes - sizeof(u64) * items; 4631 BUG_ON(pad < 0); 4632 4633 /* Use put_unaligned() because stats may not be aligned for u64. */ 4634 put_unaligned(items, &stats[0]); 4635 for (i = 1; i < items; i++) 4636 put_unaligned(snmp_fold_field64(mib, i, syncpoff), &stats[i]); 4637 4638 memset(&stats[items], 0, pad); 4639 } 4640 4641 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype, 4642 int bytes) 4643 { 4644 switch (attrtype) { 4645 case IFLA_INET6_STATS: 4646 __snmp6_fill_stats64(stats, idev->stats.ipv6, 4647 IPSTATS_MIB_MAX, bytes, offsetof(struct ipstats_mib, syncp)); 4648 break; 4649 case IFLA_INET6_ICMP6STATS: 4650 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, ICMP6_MIB_MAX, bytes); 4651 break; 4652 } 4653 } 4654 4655 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev) 4656 { 4657 struct nlattr *nla; 4658 struct ifla_cacheinfo ci; 4659 4660 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags)) 4661 goto nla_put_failure; 4662 ci.max_reasm_len = IPV6_MAXPLEN; 4663 ci.tstamp = cstamp_delta(idev->tstamp); 4664 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time); 4665 ci.retrans_time = jiffies_to_msecs(NEIGH_VAR(idev->nd_parms, RETRANS_TIME)); 4666 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci)) 4667 goto nla_put_failure; 4668 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32)); 4669 if (!nla) 4670 goto nla_put_failure; 4671 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla)); 4672 4673 /* XXX - MC not implemented */ 4674 4675 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64)); 4676 if (!nla) 4677 goto nla_put_failure; 4678 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla)); 4679 4680 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64)); 4681 if (!nla) 4682 goto nla_put_failure; 4683 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla)); 4684 4685 nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr)); 4686 if (!nla) 4687 goto nla_put_failure; 4688 4689 if (nla_put_u8(skb, IFLA_INET6_ADDR_GEN_MODE, idev->addr_gen_mode)) 4690 goto nla_put_failure; 4691 4692 read_lock_bh(&idev->lock); 4693 memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla)); 4694 read_unlock_bh(&idev->lock); 4695 4696 return 0; 4697 4698 nla_put_failure: 4699 return -EMSGSIZE; 4700 } 4701 4702 static size_t inet6_get_link_af_size(const struct net_device *dev) 4703 { 4704 if (!__in6_dev_get(dev)) 4705 return 0; 4706 4707 return inet6_ifla6_size(); 4708 } 4709 4710 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev) 4711 { 4712 struct inet6_dev *idev = __in6_dev_get(dev); 4713 4714 if (!idev) 4715 return -ENODATA; 4716 4717 if (inet6_fill_ifla6_attrs(skb, idev) < 0) 4718 return -EMSGSIZE; 4719 4720 return 0; 4721 } 4722 4723 static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token) 4724 { 4725 struct inet6_ifaddr *ifp; 4726 struct net_device *dev = idev->dev; 4727 bool update_rs = false; 4728 struct in6_addr ll_addr; 4729 4730 ASSERT_RTNL(); 4731 4732 if (!token) 4733 return -EINVAL; 4734 if (ipv6_addr_any(token)) 4735 return -EINVAL; 4736 if (dev->flags & (IFF_LOOPBACK | IFF_NOARP)) 4737 return -EINVAL; 4738 if (!ipv6_accept_ra(idev)) 4739 return -EINVAL; 4740 if (idev->cnf.rtr_solicits <= 0) 4741 return -EINVAL; 4742 4743 write_lock_bh(&idev->lock); 4744 4745 BUILD_BUG_ON(sizeof(token->s6_addr) != 16); 4746 memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8); 4747 4748 write_unlock_bh(&idev->lock); 4749 4750 if (!idev->dead && (idev->if_flags & IF_READY) && 4751 !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE | 4752 IFA_F_OPTIMISTIC)) { 4753 4754 /* If we're not ready, then normal ifup will take care 4755 * of this. Otherwise, we need to request our rs here. 4756 */ 4757 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters); 4758 update_rs = true; 4759 } 4760 4761 write_lock_bh(&idev->lock); 4762 4763 if (update_rs) { 4764 idev->if_flags |= IF_RS_SENT; 4765 idev->rs_probes = 1; 4766 addrconf_mod_rs_timer(idev, idev->cnf.rtr_solicit_interval); 4767 } 4768 4769 /* Well, that's kinda nasty ... */ 4770 list_for_each_entry(ifp, &idev->addr_list, if_list) { 4771 spin_lock(&ifp->lock); 4772 if (ifp->tokenized) { 4773 ifp->valid_lft = 0; 4774 ifp->prefered_lft = 0; 4775 } 4776 spin_unlock(&ifp->lock); 4777 } 4778 4779 write_unlock_bh(&idev->lock); 4780 inet6_ifinfo_notify(RTM_NEWLINK, idev); 4781 addrconf_verify_rtnl(); 4782 return 0; 4783 } 4784 4785 static const struct nla_policy inet6_af_policy[IFLA_INET6_MAX + 1] = { 4786 [IFLA_INET6_ADDR_GEN_MODE] = { .type = NLA_U8 }, 4787 [IFLA_INET6_TOKEN] = { .len = sizeof(struct in6_addr) }, 4788 }; 4789 4790 static int inet6_validate_link_af(const struct net_device *dev, 4791 const struct nlattr *nla) 4792 { 4793 struct nlattr *tb[IFLA_INET6_MAX + 1]; 4794 4795 if (dev && !__in6_dev_get(dev)) 4796 return -EAFNOSUPPORT; 4797 4798 return nla_parse_nested(tb, IFLA_INET6_MAX, nla, inet6_af_policy); 4799 } 4800 4801 static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla) 4802 { 4803 int err = -EINVAL; 4804 struct inet6_dev *idev = __in6_dev_get(dev); 4805 struct nlattr *tb[IFLA_INET6_MAX + 1]; 4806 4807 if (!idev) 4808 return -EAFNOSUPPORT; 4809 4810 if (nla_parse_nested(tb, IFLA_INET6_MAX, nla, NULL) < 0) 4811 BUG(); 4812 4813 if (tb[IFLA_INET6_TOKEN]) { 4814 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN])); 4815 if (err) 4816 return err; 4817 } 4818 4819 if (tb[IFLA_INET6_ADDR_GEN_MODE]) { 4820 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]); 4821 4822 if (mode != IN6_ADDR_GEN_MODE_EUI64 && 4823 mode != IN6_ADDR_GEN_MODE_NONE && 4824 mode != IN6_ADDR_GEN_MODE_STABLE_PRIVACY) 4825 return -EINVAL; 4826 4827 if (mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY && 4828 !idev->cnf.stable_secret.initialized && 4829 !dev_net(dev)->ipv6.devconf_dflt->stable_secret.initialized) 4830 return -EINVAL; 4831 4832 idev->addr_gen_mode = mode; 4833 err = 0; 4834 } 4835 4836 return err; 4837 } 4838 4839 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev, 4840 u32 portid, u32 seq, int event, unsigned int flags) 4841 { 4842 struct net_device *dev = idev->dev; 4843 struct ifinfomsg *hdr; 4844 struct nlmsghdr *nlh; 4845 void *protoinfo; 4846 4847 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags); 4848 if (!nlh) 4849 return -EMSGSIZE; 4850 4851 hdr = nlmsg_data(nlh); 4852 hdr->ifi_family = AF_INET6; 4853 hdr->__ifi_pad = 0; 4854 hdr->ifi_type = dev->type; 4855 hdr->ifi_index = dev->ifindex; 4856 hdr->ifi_flags = dev_get_flags(dev); 4857 hdr->ifi_change = 0; 4858 4859 if (nla_put_string(skb, IFLA_IFNAME, dev->name) || 4860 (dev->addr_len && 4861 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) || 4862 nla_put_u32(skb, IFLA_MTU, dev->mtu) || 4863 (dev->ifindex != dev_get_iflink(dev) && 4864 nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev)))) 4865 goto nla_put_failure; 4866 protoinfo = nla_nest_start(skb, IFLA_PROTINFO); 4867 if (!protoinfo) 4868 goto nla_put_failure; 4869 4870 if (inet6_fill_ifla6_attrs(skb, idev) < 0) 4871 goto nla_put_failure; 4872 4873 nla_nest_end(skb, protoinfo); 4874 nlmsg_end(skb, nlh); 4875 return 0; 4876 4877 nla_put_failure: 4878 nlmsg_cancel(skb, nlh); 4879 return -EMSGSIZE; 4880 } 4881 4882 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb) 4883 { 4884 struct net *net = sock_net(skb->sk); 4885 int h, s_h; 4886 int idx = 0, s_idx; 4887 struct net_device *dev; 4888 struct inet6_dev *idev; 4889 struct hlist_head *head; 4890 4891 s_h = cb->args[0]; 4892 s_idx = cb->args[1]; 4893 4894 rcu_read_lock(); 4895 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 4896 idx = 0; 4897 head = &net->dev_index_head[h]; 4898 hlist_for_each_entry_rcu(dev, head, index_hlist) { 4899 if (idx < s_idx) 4900 goto cont; 4901 idev = __in6_dev_get(dev); 4902 if (!idev) 4903 goto cont; 4904 if (inet6_fill_ifinfo(skb, idev, 4905 NETLINK_CB(cb->skb).portid, 4906 cb->nlh->nlmsg_seq, 4907 RTM_NEWLINK, NLM_F_MULTI) < 0) 4908 goto out; 4909 cont: 4910 idx++; 4911 } 4912 } 4913 out: 4914 rcu_read_unlock(); 4915 cb->args[1] = idx; 4916 cb->args[0] = h; 4917 4918 return skb->len; 4919 } 4920 4921 void inet6_ifinfo_notify(int event, struct inet6_dev *idev) 4922 { 4923 struct sk_buff *skb; 4924 struct net *net = dev_net(idev->dev); 4925 int err = -ENOBUFS; 4926 4927 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC); 4928 if (!skb) 4929 goto errout; 4930 4931 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0); 4932 if (err < 0) { 4933 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */ 4934 WARN_ON(err == -EMSGSIZE); 4935 kfree_skb(skb); 4936 goto errout; 4937 } 4938 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC); 4939 return; 4940 errout: 4941 if (err < 0) 4942 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err); 4943 } 4944 4945 static inline size_t inet6_prefix_nlmsg_size(void) 4946 { 4947 return NLMSG_ALIGN(sizeof(struct prefixmsg)) 4948 + nla_total_size(sizeof(struct in6_addr)) 4949 + nla_total_size(sizeof(struct prefix_cacheinfo)); 4950 } 4951 4952 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev, 4953 struct prefix_info *pinfo, u32 portid, u32 seq, 4954 int event, unsigned int flags) 4955 { 4956 struct prefixmsg *pmsg; 4957 struct nlmsghdr *nlh; 4958 struct prefix_cacheinfo ci; 4959 4960 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags); 4961 if (!nlh) 4962 return -EMSGSIZE; 4963 4964 pmsg = nlmsg_data(nlh); 4965 pmsg->prefix_family = AF_INET6; 4966 pmsg->prefix_pad1 = 0; 4967 pmsg->prefix_pad2 = 0; 4968 pmsg->prefix_ifindex = idev->dev->ifindex; 4969 pmsg->prefix_len = pinfo->prefix_len; 4970 pmsg->prefix_type = pinfo->type; 4971 pmsg->prefix_pad3 = 0; 4972 pmsg->prefix_flags = 0; 4973 if (pinfo->onlink) 4974 pmsg->prefix_flags |= IF_PREFIX_ONLINK; 4975 if (pinfo->autoconf) 4976 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF; 4977 4978 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix)) 4979 goto nla_put_failure; 4980 ci.preferred_time = ntohl(pinfo->prefered); 4981 ci.valid_time = ntohl(pinfo->valid); 4982 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci)) 4983 goto nla_put_failure; 4984 nlmsg_end(skb, nlh); 4985 return 0; 4986 4987 nla_put_failure: 4988 nlmsg_cancel(skb, nlh); 4989 return -EMSGSIZE; 4990 } 4991 4992 static void inet6_prefix_notify(int event, struct inet6_dev *idev, 4993 struct prefix_info *pinfo) 4994 { 4995 struct sk_buff *skb; 4996 struct net *net = dev_net(idev->dev); 4997 int err = -ENOBUFS; 4998 4999 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC); 5000 if (!skb) 5001 goto errout; 5002 5003 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0); 5004 if (err < 0) { 5005 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */ 5006 WARN_ON(err == -EMSGSIZE); 5007 kfree_skb(skb); 5008 goto errout; 5009 } 5010 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC); 5011 return; 5012 errout: 5013 if (err < 0) 5014 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err); 5015 } 5016 5017 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 5018 { 5019 struct net *net = dev_net(ifp->idev->dev); 5020 5021 if (event) 5022 ASSERT_RTNL(); 5023 5024 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp); 5025 5026 switch (event) { 5027 case RTM_NEWADDR: 5028 /* 5029 * If the address was optimistic 5030 * we inserted the route at the start of 5031 * our DAD process, so we don't need 5032 * to do it again 5033 */ 5034 if (!(ifp->rt->rt6i_node)) 5035 ip6_ins_rt(ifp->rt); 5036 if (ifp->idev->cnf.forwarding) 5037 addrconf_join_anycast(ifp); 5038 if (!ipv6_addr_any(&ifp->peer_addr)) 5039 addrconf_prefix_route(&ifp->peer_addr, 128, 5040 ifp->idev->dev, 0, 0); 5041 break; 5042 case RTM_DELADDR: 5043 if (ifp->idev->cnf.forwarding) 5044 addrconf_leave_anycast(ifp); 5045 addrconf_leave_solict(ifp->idev, &ifp->addr); 5046 if (!ipv6_addr_any(&ifp->peer_addr)) { 5047 struct rt6_info *rt; 5048 5049 rt = addrconf_get_prefix_route(&ifp->peer_addr, 128, 5050 ifp->idev->dev, 0, 0); 5051 if (rt && ip6_del_rt(rt)) 5052 dst_free(&rt->dst); 5053 } 5054 dst_hold(&ifp->rt->dst); 5055 5056 if (ip6_del_rt(ifp->rt)) 5057 dst_free(&ifp->rt->dst); 5058 5059 rt_genid_bump_ipv6(net); 5060 break; 5061 } 5062 atomic_inc(&net->ipv6.dev_addr_genid); 5063 } 5064 5065 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 5066 { 5067 rcu_read_lock_bh(); 5068 if (likely(ifp->idev->dead == 0)) 5069 __ipv6_ifa_notify(event, ifp); 5070 rcu_read_unlock_bh(); 5071 } 5072 5073 #ifdef CONFIG_SYSCTL 5074 5075 static 5076 int addrconf_sysctl_forward(struct ctl_table *ctl, int write, 5077 void __user *buffer, size_t *lenp, loff_t *ppos) 5078 { 5079 int *valp = ctl->data; 5080 int val = *valp; 5081 loff_t pos = *ppos; 5082 struct ctl_table lctl; 5083 int ret; 5084 5085 /* 5086 * ctl->data points to idev->cnf.forwarding, we should 5087 * not modify it until we get the rtnl lock. 5088 */ 5089 lctl = *ctl; 5090 lctl.data = &val; 5091 5092 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 5093 5094 if (write) 5095 ret = addrconf_fixup_forwarding(ctl, valp, val); 5096 if (ret) 5097 *ppos = pos; 5098 return ret; 5099 } 5100 5101 static 5102 int addrconf_sysctl_mtu(struct ctl_table *ctl, int write, 5103 void __user *buffer, size_t *lenp, loff_t *ppos) 5104 { 5105 struct inet6_dev *idev = ctl->extra1; 5106 int min_mtu = IPV6_MIN_MTU; 5107 struct ctl_table lctl; 5108 5109 lctl = *ctl; 5110 lctl.extra1 = &min_mtu; 5111 lctl.extra2 = idev ? &idev->dev->mtu : NULL; 5112 5113 return proc_dointvec_minmax(&lctl, write, buffer, lenp, ppos); 5114 } 5115 5116 static void dev_disable_change(struct inet6_dev *idev) 5117 { 5118 struct netdev_notifier_info info; 5119 5120 if (!idev || !idev->dev) 5121 return; 5122 5123 netdev_notifier_info_init(&info, idev->dev); 5124 if (idev->cnf.disable_ipv6) 5125 addrconf_notify(NULL, NETDEV_DOWN, &info); 5126 else 5127 addrconf_notify(NULL, NETDEV_UP, &info); 5128 } 5129 5130 static void addrconf_disable_change(struct net *net, __s32 newf) 5131 { 5132 struct net_device *dev; 5133 struct inet6_dev *idev; 5134 5135 rcu_read_lock(); 5136 for_each_netdev_rcu(net, dev) { 5137 idev = __in6_dev_get(dev); 5138 if (idev) { 5139 int changed = (!idev->cnf.disable_ipv6) ^ (!newf); 5140 idev->cnf.disable_ipv6 = newf; 5141 if (changed) 5142 dev_disable_change(idev); 5143 } 5144 } 5145 rcu_read_unlock(); 5146 } 5147 5148 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf) 5149 { 5150 struct net *net; 5151 int old; 5152 5153 if (!rtnl_trylock()) 5154 return restart_syscall(); 5155 5156 net = (struct net *)table->extra2; 5157 old = *p; 5158 *p = newf; 5159 5160 if (p == &net->ipv6.devconf_dflt->disable_ipv6) { 5161 rtnl_unlock(); 5162 return 0; 5163 } 5164 5165 if (p == &net->ipv6.devconf_all->disable_ipv6) { 5166 net->ipv6.devconf_dflt->disable_ipv6 = newf; 5167 addrconf_disable_change(net, newf); 5168 } else if ((!newf) ^ (!old)) 5169 dev_disable_change((struct inet6_dev *)table->extra1); 5170 5171 rtnl_unlock(); 5172 return 0; 5173 } 5174 5175 static 5176 int addrconf_sysctl_disable(struct ctl_table *ctl, int write, 5177 void __user *buffer, size_t *lenp, loff_t *ppos) 5178 { 5179 int *valp = ctl->data; 5180 int val = *valp; 5181 loff_t pos = *ppos; 5182 struct ctl_table lctl; 5183 int ret; 5184 5185 /* 5186 * ctl->data points to idev->cnf.disable_ipv6, we should 5187 * not modify it until we get the rtnl lock. 5188 */ 5189 lctl = *ctl; 5190 lctl.data = &val; 5191 5192 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 5193 5194 if (write) 5195 ret = addrconf_disable_ipv6(ctl, valp, val); 5196 if (ret) 5197 *ppos = pos; 5198 return ret; 5199 } 5200 5201 static 5202 int addrconf_sysctl_proxy_ndp(struct ctl_table *ctl, int write, 5203 void __user *buffer, size_t *lenp, loff_t *ppos) 5204 { 5205 int *valp = ctl->data; 5206 int ret; 5207 int old, new; 5208 5209 old = *valp; 5210 ret = proc_dointvec(ctl, write, buffer, lenp, ppos); 5211 new = *valp; 5212 5213 if (write && old != new) { 5214 struct net *net = ctl->extra2; 5215 5216 if (!rtnl_trylock()) 5217 return restart_syscall(); 5218 5219 if (valp == &net->ipv6.devconf_dflt->proxy_ndp) 5220 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH, 5221 NETCONFA_IFINDEX_DEFAULT, 5222 net->ipv6.devconf_dflt); 5223 else if (valp == &net->ipv6.devconf_all->proxy_ndp) 5224 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH, 5225 NETCONFA_IFINDEX_ALL, 5226 net->ipv6.devconf_all); 5227 else { 5228 struct inet6_dev *idev = ctl->extra1; 5229 5230 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH, 5231 idev->dev->ifindex, 5232 &idev->cnf); 5233 } 5234 rtnl_unlock(); 5235 } 5236 5237 return ret; 5238 } 5239 5240 static int addrconf_sysctl_stable_secret(struct ctl_table *ctl, int write, 5241 void __user *buffer, size_t *lenp, 5242 loff_t *ppos) 5243 { 5244 int err; 5245 struct in6_addr addr; 5246 char str[IPV6_MAX_STRLEN]; 5247 struct ctl_table lctl = *ctl; 5248 struct net *net = ctl->extra2; 5249 struct ipv6_stable_secret *secret = ctl->data; 5250 5251 if (&net->ipv6.devconf_all->stable_secret == ctl->data) 5252 return -EIO; 5253 5254 lctl.maxlen = IPV6_MAX_STRLEN; 5255 lctl.data = str; 5256 5257 if (!rtnl_trylock()) 5258 return restart_syscall(); 5259 5260 if (!write && !secret->initialized) { 5261 err = -EIO; 5262 goto out; 5263 } 5264 5265 if (!write) { 5266 err = snprintf(str, sizeof(str), "%pI6", 5267 &secret->secret); 5268 if (err >= sizeof(str)) { 5269 err = -EIO; 5270 goto out; 5271 } 5272 } 5273 5274 err = proc_dostring(&lctl, write, buffer, lenp, ppos); 5275 if (err || !write) 5276 goto out; 5277 5278 if (in6_pton(str, -1, addr.in6_u.u6_addr8, -1, NULL) != 1) { 5279 err = -EIO; 5280 goto out; 5281 } 5282 5283 secret->initialized = true; 5284 secret->secret = addr; 5285 5286 if (&net->ipv6.devconf_dflt->stable_secret == ctl->data) { 5287 struct net_device *dev; 5288 5289 for_each_netdev(net, dev) { 5290 struct inet6_dev *idev = __in6_dev_get(dev); 5291 5292 if (idev) { 5293 idev->addr_gen_mode = 5294 IN6_ADDR_GEN_MODE_STABLE_PRIVACY; 5295 } 5296 } 5297 } else { 5298 struct inet6_dev *idev = ctl->extra1; 5299 5300 idev->addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY; 5301 } 5302 5303 out: 5304 rtnl_unlock(); 5305 5306 return err; 5307 } 5308 5309 static struct addrconf_sysctl_table 5310 { 5311 struct ctl_table_header *sysctl_header; 5312 struct ctl_table addrconf_vars[DEVCONF_MAX+1]; 5313 } addrconf_sysctl __read_mostly = { 5314 .sysctl_header = NULL, 5315 .addrconf_vars = { 5316 { 5317 .procname = "forwarding", 5318 .data = &ipv6_devconf.forwarding, 5319 .maxlen = sizeof(int), 5320 .mode = 0644, 5321 .proc_handler = addrconf_sysctl_forward, 5322 }, 5323 { 5324 .procname = "hop_limit", 5325 .data = &ipv6_devconf.hop_limit, 5326 .maxlen = sizeof(int), 5327 .mode = 0644, 5328 .proc_handler = proc_dointvec, 5329 }, 5330 { 5331 .procname = "mtu", 5332 .data = &ipv6_devconf.mtu6, 5333 .maxlen = sizeof(int), 5334 .mode = 0644, 5335 .proc_handler = addrconf_sysctl_mtu, 5336 }, 5337 { 5338 .procname = "accept_ra", 5339 .data = &ipv6_devconf.accept_ra, 5340 .maxlen = sizeof(int), 5341 .mode = 0644, 5342 .proc_handler = proc_dointvec, 5343 }, 5344 { 5345 .procname = "accept_redirects", 5346 .data = &ipv6_devconf.accept_redirects, 5347 .maxlen = sizeof(int), 5348 .mode = 0644, 5349 .proc_handler = proc_dointvec, 5350 }, 5351 { 5352 .procname = "autoconf", 5353 .data = &ipv6_devconf.autoconf, 5354 .maxlen = sizeof(int), 5355 .mode = 0644, 5356 .proc_handler = proc_dointvec, 5357 }, 5358 { 5359 .procname = "dad_transmits", 5360 .data = &ipv6_devconf.dad_transmits, 5361 .maxlen = sizeof(int), 5362 .mode = 0644, 5363 .proc_handler = proc_dointvec, 5364 }, 5365 { 5366 .procname = "router_solicitations", 5367 .data = &ipv6_devconf.rtr_solicits, 5368 .maxlen = sizeof(int), 5369 .mode = 0644, 5370 .proc_handler = proc_dointvec, 5371 }, 5372 { 5373 .procname = "router_solicitation_interval", 5374 .data = &ipv6_devconf.rtr_solicit_interval, 5375 .maxlen = sizeof(int), 5376 .mode = 0644, 5377 .proc_handler = proc_dointvec_jiffies, 5378 }, 5379 { 5380 .procname = "router_solicitation_delay", 5381 .data = &ipv6_devconf.rtr_solicit_delay, 5382 .maxlen = sizeof(int), 5383 .mode = 0644, 5384 .proc_handler = proc_dointvec_jiffies, 5385 }, 5386 { 5387 .procname = "force_mld_version", 5388 .data = &ipv6_devconf.force_mld_version, 5389 .maxlen = sizeof(int), 5390 .mode = 0644, 5391 .proc_handler = proc_dointvec, 5392 }, 5393 { 5394 .procname = "mldv1_unsolicited_report_interval", 5395 .data = 5396 &ipv6_devconf.mldv1_unsolicited_report_interval, 5397 .maxlen = sizeof(int), 5398 .mode = 0644, 5399 .proc_handler = proc_dointvec_ms_jiffies, 5400 }, 5401 { 5402 .procname = "mldv2_unsolicited_report_interval", 5403 .data = 5404 &ipv6_devconf.mldv2_unsolicited_report_interval, 5405 .maxlen = sizeof(int), 5406 .mode = 0644, 5407 .proc_handler = proc_dointvec_ms_jiffies, 5408 }, 5409 { 5410 .procname = "use_tempaddr", 5411 .data = &ipv6_devconf.use_tempaddr, 5412 .maxlen = sizeof(int), 5413 .mode = 0644, 5414 .proc_handler = proc_dointvec, 5415 }, 5416 { 5417 .procname = "temp_valid_lft", 5418 .data = &ipv6_devconf.temp_valid_lft, 5419 .maxlen = sizeof(int), 5420 .mode = 0644, 5421 .proc_handler = proc_dointvec, 5422 }, 5423 { 5424 .procname = "temp_prefered_lft", 5425 .data = &ipv6_devconf.temp_prefered_lft, 5426 .maxlen = sizeof(int), 5427 .mode = 0644, 5428 .proc_handler = proc_dointvec, 5429 }, 5430 { 5431 .procname = "regen_max_retry", 5432 .data = &ipv6_devconf.regen_max_retry, 5433 .maxlen = sizeof(int), 5434 .mode = 0644, 5435 .proc_handler = proc_dointvec, 5436 }, 5437 { 5438 .procname = "max_desync_factor", 5439 .data = &ipv6_devconf.max_desync_factor, 5440 .maxlen = sizeof(int), 5441 .mode = 0644, 5442 .proc_handler = proc_dointvec, 5443 }, 5444 { 5445 .procname = "max_addresses", 5446 .data = &ipv6_devconf.max_addresses, 5447 .maxlen = sizeof(int), 5448 .mode = 0644, 5449 .proc_handler = proc_dointvec, 5450 }, 5451 { 5452 .procname = "accept_ra_defrtr", 5453 .data = &ipv6_devconf.accept_ra_defrtr, 5454 .maxlen = sizeof(int), 5455 .mode = 0644, 5456 .proc_handler = proc_dointvec, 5457 }, 5458 { 5459 .procname = "accept_ra_pinfo", 5460 .data = &ipv6_devconf.accept_ra_pinfo, 5461 .maxlen = sizeof(int), 5462 .mode = 0644, 5463 .proc_handler = proc_dointvec, 5464 }, 5465 #ifdef CONFIG_IPV6_ROUTER_PREF 5466 { 5467 .procname = "accept_ra_rtr_pref", 5468 .data = &ipv6_devconf.accept_ra_rtr_pref, 5469 .maxlen = sizeof(int), 5470 .mode = 0644, 5471 .proc_handler = proc_dointvec, 5472 }, 5473 { 5474 .procname = "router_probe_interval", 5475 .data = &ipv6_devconf.rtr_probe_interval, 5476 .maxlen = sizeof(int), 5477 .mode = 0644, 5478 .proc_handler = proc_dointvec_jiffies, 5479 }, 5480 #ifdef CONFIG_IPV6_ROUTE_INFO 5481 { 5482 .procname = "accept_ra_rt_info_max_plen", 5483 .data = &ipv6_devconf.accept_ra_rt_info_max_plen, 5484 .maxlen = sizeof(int), 5485 .mode = 0644, 5486 .proc_handler = proc_dointvec, 5487 }, 5488 #endif 5489 #endif 5490 { 5491 .procname = "proxy_ndp", 5492 .data = &ipv6_devconf.proxy_ndp, 5493 .maxlen = sizeof(int), 5494 .mode = 0644, 5495 .proc_handler = addrconf_sysctl_proxy_ndp, 5496 }, 5497 { 5498 .procname = "accept_source_route", 5499 .data = &ipv6_devconf.accept_source_route, 5500 .maxlen = sizeof(int), 5501 .mode = 0644, 5502 .proc_handler = proc_dointvec, 5503 }, 5504 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 5505 { 5506 .procname = "optimistic_dad", 5507 .data = &ipv6_devconf.optimistic_dad, 5508 .maxlen = sizeof(int), 5509 .mode = 0644, 5510 .proc_handler = proc_dointvec, 5511 5512 }, 5513 { 5514 .procname = "use_optimistic", 5515 .data = &ipv6_devconf.use_optimistic, 5516 .maxlen = sizeof(int), 5517 .mode = 0644, 5518 .proc_handler = proc_dointvec, 5519 5520 }, 5521 #endif 5522 #ifdef CONFIG_IPV6_MROUTE 5523 { 5524 .procname = "mc_forwarding", 5525 .data = &ipv6_devconf.mc_forwarding, 5526 .maxlen = sizeof(int), 5527 .mode = 0444, 5528 .proc_handler = proc_dointvec, 5529 }, 5530 #endif 5531 { 5532 .procname = "disable_ipv6", 5533 .data = &ipv6_devconf.disable_ipv6, 5534 .maxlen = sizeof(int), 5535 .mode = 0644, 5536 .proc_handler = addrconf_sysctl_disable, 5537 }, 5538 { 5539 .procname = "accept_dad", 5540 .data = &ipv6_devconf.accept_dad, 5541 .maxlen = sizeof(int), 5542 .mode = 0644, 5543 .proc_handler = proc_dointvec, 5544 }, 5545 { 5546 .procname = "force_tllao", 5547 .data = &ipv6_devconf.force_tllao, 5548 .maxlen = sizeof(int), 5549 .mode = 0644, 5550 .proc_handler = proc_dointvec 5551 }, 5552 { 5553 .procname = "ndisc_notify", 5554 .data = &ipv6_devconf.ndisc_notify, 5555 .maxlen = sizeof(int), 5556 .mode = 0644, 5557 .proc_handler = proc_dointvec 5558 }, 5559 { 5560 .procname = "suppress_frag_ndisc", 5561 .data = &ipv6_devconf.suppress_frag_ndisc, 5562 .maxlen = sizeof(int), 5563 .mode = 0644, 5564 .proc_handler = proc_dointvec 5565 }, 5566 { 5567 .procname = "accept_ra_from_local", 5568 .data = &ipv6_devconf.accept_ra_from_local, 5569 .maxlen = sizeof(int), 5570 .mode = 0644, 5571 .proc_handler = proc_dointvec, 5572 }, 5573 { 5574 .procname = "accept_ra_mtu", 5575 .data = &ipv6_devconf.accept_ra_mtu, 5576 .maxlen = sizeof(int), 5577 .mode = 0644, 5578 .proc_handler = proc_dointvec, 5579 }, 5580 { 5581 .procname = "stable_secret", 5582 .data = &ipv6_devconf.stable_secret, 5583 .maxlen = IPV6_MAX_STRLEN, 5584 .mode = 0600, 5585 .proc_handler = addrconf_sysctl_stable_secret, 5586 }, 5587 { 5588 /* sentinel */ 5589 } 5590 }, 5591 }; 5592 5593 static int __addrconf_sysctl_register(struct net *net, char *dev_name, 5594 struct inet6_dev *idev, struct ipv6_devconf *p) 5595 { 5596 int i; 5597 struct addrconf_sysctl_table *t; 5598 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ]; 5599 5600 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL); 5601 if (!t) 5602 goto out; 5603 5604 for (i = 0; t->addrconf_vars[i].data; i++) { 5605 t->addrconf_vars[i].data += (char *)p - (char *)&ipv6_devconf; 5606 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */ 5607 t->addrconf_vars[i].extra2 = net; 5608 } 5609 5610 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name); 5611 5612 t->sysctl_header = register_net_sysctl(net, path, t->addrconf_vars); 5613 if (!t->sysctl_header) 5614 goto free; 5615 5616 p->sysctl = t; 5617 return 0; 5618 5619 free: 5620 kfree(t); 5621 out: 5622 return -ENOBUFS; 5623 } 5624 5625 static void __addrconf_sysctl_unregister(struct ipv6_devconf *p) 5626 { 5627 struct addrconf_sysctl_table *t; 5628 5629 if (!p->sysctl) 5630 return; 5631 5632 t = p->sysctl; 5633 p->sysctl = NULL; 5634 unregister_net_sysctl_table(t->sysctl_header); 5635 kfree(t); 5636 } 5637 5638 static int addrconf_sysctl_register(struct inet6_dev *idev) 5639 { 5640 int err; 5641 5642 if (!sysctl_dev_name_is_allowed(idev->dev->name)) 5643 return -EINVAL; 5644 5645 err = neigh_sysctl_register(idev->dev, idev->nd_parms, 5646 &ndisc_ifinfo_sysctl_change); 5647 if (err) 5648 return err; 5649 err = __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name, 5650 idev, &idev->cnf); 5651 if (err) 5652 neigh_sysctl_unregister(idev->nd_parms); 5653 5654 return err; 5655 } 5656 5657 static void addrconf_sysctl_unregister(struct inet6_dev *idev) 5658 { 5659 __addrconf_sysctl_unregister(&idev->cnf); 5660 neigh_sysctl_unregister(idev->nd_parms); 5661 } 5662 5663 5664 #endif 5665 5666 static int __net_init addrconf_init_net(struct net *net) 5667 { 5668 int err = -ENOMEM; 5669 struct ipv6_devconf *all, *dflt; 5670 5671 all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL); 5672 if (!all) 5673 goto err_alloc_all; 5674 5675 dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL); 5676 if (!dflt) 5677 goto err_alloc_dflt; 5678 5679 /* these will be inherited by all namespaces */ 5680 dflt->autoconf = ipv6_defaults.autoconf; 5681 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6; 5682 5683 dflt->stable_secret.initialized = false; 5684 all->stable_secret.initialized = false; 5685 5686 net->ipv6.devconf_all = all; 5687 net->ipv6.devconf_dflt = dflt; 5688 5689 #ifdef CONFIG_SYSCTL 5690 err = __addrconf_sysctl_register(net, "all", NULL, all); 5691 if (err < 0) 5692 goto err_reg_all; 5693 5694 err = __addrconf_sysctl_register(net, "default", NULL, dflt); 5695 if (err < 0) 5696 goto err_reg_dflt; 5697 #endif 5698 return 0; 5699 5700 #ifdef CONFIG_SYSCTL 5701 err_reg_dflt: 5702 __addrconf_sysctl_unregister(all); 5703 err_reg_all: 5704 kfree(dflt); 5705 #endif 5706 err_alloc_dflt: 5707 kfree(all); 5708 err_alloc_all: 5709 return err; 5710 } 5711 5712 static void __net_exit addrconf_exit_net(struct net *net) 5713 { 5714 #ifdef CONFIG_SYSCTL 5715 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt); 5716 __addrconf_sysctl_unregister(net->ipv6.devconf_all); 5717 #endif 5718 kfree(net->ipv6.devconf_dflt); 5719 kfree(net->ipv6.devconf_all); 5720 } 5721 5722 static struct pernet_operations addrconf_ops = { 5723 .init = addrconf_init_net, 5724 .exit = addrconf_exit_net, 5725 }; 5726 5727 static struct rtnl_af_ops inet6_ops __read_mostly = { 5728 .family = AF_INET6, 5729 .fill_link_af = inet6_fill_link_af, 5730 .get_link_af_size = inet6_get_link_af_size, 5731 .validate_link_af = inet6_validate_link_af, 5732 .set_link_af = inet6_set_link_af, 5733 }; 5734 5735 /* 5736 * Init / cleanup code 5737 */ 5738 5739 int __init addrconf_init(void) 5740 { 5741 struct inet6_dev *idev; 5742 int i, err; 5743 5744 err = ipv6_addr_label_init(); 5745 if (err < 0) { 5746 pr_crit("%s: cannot initialize default policy table: %d\n", 5747 __func__, err); 5748 goto out; 5749 } 5750 5751 err = register_pernet_subsys(&addrconf_ops); 5752 if (err < 0) 5753 goto out_addrlabel; 5754 5755 addrconf_wq = create_workqueue("ipv6_addrconf"); 5756 if (!addrconf_wq) { 5757 err = -ENOMEM; 5758 goto out_nowq; 5759 } 5760 5761 /* The addrconf netdev notifier requires that loopback_dev 5762 * has it's ipv6 private information allocated and setup 5763 * before it can bring up and give link-local addresses 5764 * to other devices which are up. 5765 * 5766 * Unfortunately, loopback_dev is not necessarily the first 5767 * entry in the global dev_base list of net devices. In fact, 5768 * it is likely to be the very last entry on that list. 5769 * So this causes the notifier registry below to try and 5770 * give link-local addresses to all devices besides loopback_dev 5771 * first, then loopback_dev, which cases all the non-loopback_dev 5772 * devices to fail to get a link-local address. 5773 * 5774 * So, as a temporary fix, allocate the ipv6 structure for 5775 * loopback_dev first by hand. 5776 * Longer term, all of the dependencies ipv6 has upon the loopback 5777 * device and it being up should be removed. 5778 */ 5779 rtnl_lock(); 5780 idev = ipv6_add_dev(init_net.loopback_dev); 5781 rtnl_unlock(); 5782 if (IS_ERR(idev)) { 5783 err = PTR_ERR(idev); 5784 goto errlo; 5785 } 5786 5787 for (i = 0; i < IN6_ADDR_HSIZE; i++) 5788 INIT_HLIST_HEAD(&inet6_addr_lst[i]); 5789 5790 register_netdevice_notifier(&ipv6_dev_notf); 5791 5792 addrconf_verify(); 5793 5794 rtnl_af_register(&inet6_ops); 5795 5796 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo, 5797 NULL); 5798 if (err < 0) 5799 goto errout; 5800 5801 /* Only the first call to __rtnl_register can fail */ 5802 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL, NULL); 5803 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL, NULL); 5804 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr, 5805 inet6_dump_ifaddr, NULL); 5806 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL, 5807 inet6_dump_ifmcaddr, NULL); 5808 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL, 5809 inet6_dump_ifacaddr, NULL); 5810 __rtnl_register(PF_INET6, RTM_GETNETCONF, inet6_netconf_get_devconf, 5811 inet6_netconf_dump_devconf, NULL); 5812 5813 ipv6_addr_label_rtnl_register(); 5814 5815 return 0; 5816 errout: 5817 rtnl_af_unregister(&inet6_ops); 5818 unregister_netdevice_notifier(&ipv6_dev_notf); 5819 errlo: 5820 destroy_workqueue(addrconf_wq); 5821 out_nowq: 5822 unregister_pernet_subsys(&addrconf_ops); 5823 out_addrlabel: 5824 ipv6_addr_label_cleanup(); 5825 out: 5826 return err; 5827 } 5828 5829 void addrconf_cleanup(void) 5830 { 5831 struct net_device *dev; 5832 int i; 5833 5834 unregister_netdevice_notifier(&ipv6_dev_notf); 5835 unregister_pernet_subsys(&addrconf_ops); 5836 ipv6_addr_label_cleanup(); 5837 5838 rtnl_lock(); 5839 5840 __rtnl_af_unregister(&inet6_ops); 5841 5842 /* clean dev list */ 5843 for_each_netdev(&init_net, dev) { 5844 if (__in6_dev_get(dev) == NULL) 5845 continue; 5846 addrconf_ifdown(dev, 1); 5847 } 5848 addrconf_ifdown(init_net.loopback_dev, 2); 5849 5850 /* 5851 * Check hash table. 5852 */ 5853 spin_lock_bh(&addrconf_hash_lock); 5854 for (i = 0; i < IN6_ADDR_HSIZE; i++) 5855 WARN_ON(!hlist_empty(&inet6_addr_lst[i])); 5856 spin_unlock_bh(&addrconf_hash_lock); 5857 cancel_delayed_work(&addr_chk_work); 5858 rtnl_unlock(); 5859 5860 destroy_workqueue(addrconf_wq); 5861 } 5862