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 == NULL) 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 == NULL) { 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 == NULL) 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 == NULL) 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 == NULL) 578 goto errout; 579 in6_dev = __in6_dev_get(dev); 580 if (in6_dev == NULL) 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 == NULL) 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 == NULL) { 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 == NULL || 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 == NULL || 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 == NULL || 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 inet6_dev *idev = ifp->idev; 1714 1715 if (addrconf_dad_end(ifp)) { 1716 in6_ifa_put(ifp); 1717 return; 1718 } 1719 1720 net_info_ratelimited("%s: IPv6 duplicate address %pI6c detected!\n", 1721 ifp->idev->dev->name, &ifp->addr); 1722 1723 if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6) { 1724 struct in6_addr addr; 1725 1726 addr.s6_addr32[0] = htonl(0xfe800000); 1727 addr.s6_addr32[1] = 0; 1728 1729 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) && 1730 ipv6_addr_equal(&ifp->addr, &addr)) { 1731 /* DAD failed for link-local based on MAC address */ 1732 idev->cnf.disable_ipv6 = 1; 1733 1734 pr_info("%s: IPv6 being disabled!\n", 1735 ifp->idev->dev->name); 1736 } 1737 } 1738 1739 spin_lock_bh(&ifp->lock); 1740 /* transition from _POSTDAD to _ERRDAD */ 1741 ifp->state = INET6_IFADDR_STATE_ERRDAD; 1742 spin_unlock_bh(&ifp->lock); 1743 1744 addrconf_mod_dad_work(ifp, 0); 1745 } 1746 1747 /* Join to solicited addr multicast group. 1748 * caller must hold RTNL */ 1749 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr) 1750 { 1751 struct in6_addr maddr; 1752 1753 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP)) 1754 return; 1755 1756 addrconf_addr_solict_mult(addr, &maddr); 1757 ipv6_dev_mc_inc(dev, &maddr); 1758 } 1759 1760 /* caller must hold RTNL */ 1761 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr) 1762 { 1763 struct in6_addr maddr; 1764 1765 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP)) 1766 return; 1767 1768 addrconf_addr_solict_mult(addr, &maddr); 1769 __ipv6_dev_mc_dec(idev, &maddr); 1770 } 1771 1772 /* caller must hold RTNL */ 1773 static void addrconf_join_anycast(struct inet6_ifaddr *ifp) 1774 { 1775 struct in6_addr addr; 1776 1777 if (ifp->prefix_len >= 127) /* RFC 6164 */ 1778 return; 1779 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len); 1780 if (ipv6_addr_any(&addr)) 1781 return; 1782 __ipv6_dev_ac_inc(ifp->idev, &addr); 1783 } 1784 1785 /* caller must hold RTNL */ 1786 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp) 1787 { 1788 struct in6_addr addr; 1789 1790 if (ifp->prefix_len >= 127) /* RFC 6164 */ 1791 return; 1792 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len); 1793 if (ipv6_addr_any(&addr)) 1794 return; 1795 __ipv6_dev_ac_dec(ifp->idev, &addr); 1796 } 1797 1798 static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev) 1799 { 1800 if (dev->addr_len != ETH_ALEN) 1801 return -1; 1802 memcpy(eui, dev->dev_addr, 3); 1803 memcpy(eui + 5, dev->dev_addr + 3, 3); 1804 1805 /* 1806 * The zSeries OSA network cards can be shared among various 1807 * OS instances, but the OSA cards have only one MAC address. 1808 * This leads to duplicate address conflicts in conjunction 1809 * with IPv6 if more than one instance uses the same card. 1810 * 1811 * The driver for these cards can deliver a unique 16-bit 1812 * identifier for each instance sharing the same card. It is 1813 * placed instead of 0xFFFE in the interface identifier. The 1814 * "u" bit of the interface identifier is not inverted in this 1815 * case. Hence the resulting interface identifier has local 1816 * scope according to RFC2373. 1817 */ 1818 if (dev->dev_id) { 1819 eui[3] = (dev->dev_id >> 8) & 0xFF; 1820 eui[4] = dev->dev_id & 0xFF; 1821 } else { 1822 eui[3] = 0xFF; 1823 eui[4] = 0xFE; 1824 eui[0] ^= 2; 1825 } 1826 return 0; 1827 } 1828 1829 static int addrconf_ifid_eui64(u8 *eui, struct net_device *dev) 1830 { 1831 if (dev->addr_len != IEEE802154_ADDR_LEN) 1832 return -1; 1833 memcpy(eui, dev->dev_addr, 8); 1834 eui[0] ^= 2; 1835 return 0; 1836 } 1837 1838 static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev) 1839 { 1840 union fwnet_hwaddr *ha; 1841 1842 if (dev->addr_len != FWNET_ALEN) 1843 return -1; 1844 1845 ha = (union fwnet_hwaddr *)dev->dev_addr; 1846 1847 memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id)); 1848 eui[0] ^= 2; 1849 return 0; 1850 } 1851 1852 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev) 1853 { 1854 /* XXX: inherit EUI-64 from other interface -- yoshfuji */ 1855 if (dev->addr_len != ARCNET_ALEN) 1856 return -1; 1857 memset(eui, 0, 7); 1858 eui[7] = *(u8 *)dev->dev_addr; 1859 return 0; 1860 } 1861 1862 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev) 1863 { 1864 if (dev->addr_len != INFINIBAND_ALEN) 1865 return -1; 1866 memcpy(eui, dev->dev_addr + 12, 8); 1867 eui[0] |= 2; 1868 return 0; 1869 } 1870 1871 static int __ipv6_isatap_ifid(u8 *eui, __be32 addr) 1872 { 1873 if (addr == 0) 1874 return -1; 1875 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) || 1876 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) || 1877 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) || 1878 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) || 1879 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) || 1880 ipv4_is_lbcast(addr)) ? 0x00 : 0x02; 1881 eui[1] = 0; 1882 eui[2] = 0x5E; 1883 eui[3] = 0xFE; 1884 memcpy(eui + 4, &addr, 4); 1885 return 0; 1886 } 1887 1888 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev) 1889 { 1890 if (dev->priv_flags & IFF_ISATAP) 1891 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr); 1892 return -1; 1893 } 1894 1895 static int addrconf_ifid_gre(u8 *eui, struct net_device *dev) 1896 { 1897 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr); 1898 } 1899 1900 static int addrconf_ifid_ip6tnl(u8 *eui, struct net_device *dev) 1901 { 1902 memcpy(eui, dev->perm_addr, 3); 1903 memcpy(eui + 5, dev->perm_addr + 3, 3); 1904 eui[3] = 0xFF; 1905 eui[4] = 0xFE; 1906 eui[0] ^= 2; 1907 return 0; 1908 } 1909 1910 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev) 1911 { 1912 switch (dev->type) { 1913 case ARPHRD_ETHER: 1914 case ARPHRD_FDDI: 1915 return addrconf_ifid_eui48(eui, dev); 1916 case ARPHRD_ARCNET: 1917 return addrconf_ifid_arcnet(eui, dev); 1918 case ARPHRD_INFINIBAND: 1919 return addrconf_ifid_infiniband(eui, dev); 1920 case ARPHRD_SIT: 1921 return addrconf_ifid_sit(eui, dev); 1922 case ARPHRD_IPGRE: 1923 return addrconf_ifid_gre(eui, dev); 1924 case ARPHRD_6LOWPAN: 1925 case ARPHRD_IEEE802154: 1926 return addrconf_ifid_eui64(eui, dev); 1927 case ARPHRD_IEEE1394: 1928 return addrconf_ifid_ieee1394(eui, dev); 1929 case ARPHRD_TUNNEL6: 1930 return addrconf_ifid_ip6tnl(eui, dev); 1931 } 1932 return -1; 1933 } 1934 1935 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev) 1936 { 1937 int err = -1; 1938 struct inet6_ifaddr *ifp; 1939 1940 read_lock_bh(&idev->lock); 1941 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) { 1942 if (ifp->scope > IFA_LINK) 1943 break; 1944 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) { 1945 memcpy(eui, ifp->addr.s6_addr+8, 8); 1946 err = 0; 1947 break; 1948 } 1949 } 1950 read_unlock_bh(&idev->lock); 1951 return err; 1952 } 1953 1954 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */ 1955 static void __ipv6_regen_rndid(struct inet6_dev *idev) 1956 { 1957 regen: 1958 get_random_bytes(idev->rndid, sizeof(idev->rndid)); 1959 idev->rndid[0] &= ~0x02; 1960 1961 /* 1962 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>: 1963 * check if generated address is not inappropriate 1964 * 1965 * - Reserved subnet anycast (RFC 2526) 1966 * 11111101 11....11 1xxxxxxx 1967 * - ISATAP (RFC4214) 6.1 1968 * 00-00-5E-FE-xx-xx-xx-xx 1969 * - value 0 1970 * - XXX: already assigned to an address on the device 1971 */ 1972 if (idev->rndid[0] == 0xfd && 1973 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff && 1974 (idev->rndid[7]&0x80)) 1975 goto regen; 1976 if ((idev->rndid[0]|idev->rndid[1]) == 0) { 1977 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe) 1978 goto regen; 1979 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00) 1980 goto regen; 1981 } 1982 } 1983 1984 static void ipv6_regen_rndid(unsigned long data) 1985 { 1986 struct inet6_dev *idev = (struct inet6_dev *) data; 1987 unsigned long expires; 1988 1989 rcu_read_lock_bh(); 1990 write_lock_bh(&idev->lock); 1991 1992 if (idev->dead) 1993 goto out; 1994 1995 __ipv6_regen_rndid(idev); 1996 1997 expires = jiffies + 1998 idev->cnf.temp_prefered_lft * HZ - 1999 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * 2000 NEIGH_VAR(idev->nd_parms, RETRANS_TIME) - 2001 idev->cnf.max_desync_factor * HZ; 2002 if (time_before(expires, jiffies)) { 2003 pr_warn("%s: too short regeneration interval; timer disabled for %s\n", 2004 __func__, idev->dev->name); 2005 goto out; 2006 } 2007 2008 if (!mod_timer(&idev->regen_timer, expires)) 2009 in6_dev_hold(idev); 2010 2011 out: 2012 write_unlock_bh(&idev->lock); 2013 rcu_read_unlock_bh(); 2014 in6_dev_put(idev); 2015 } 2016 2017 static void __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) 2018 { 2019 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0) 2020 __ipv6_regen_rndid(idev); 2021 } 2022 2023 /* 2024 * Add prefix route. 2025 */ 2026 2027 static void 2028 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev, 2029 unsigned long expires, u32 flags) 2030 { 2031 struct fib6_config cfg = { 2032 .fc_table = RT6_TABLE_PREFIX, 2033 .fc_metric = IP6_RT_PRIO_ADDRCONF, 2034 .fc_ifindex = dev->ifindex, 2035 .fc_expires = expires, 2036 .fc_dst_len = plen, 2037 .fc_flags = RTF_UP | flags, 2038 .fc_nlinfo.nl_net = dev_net(dev), 2039 .fc_protocol = RTPROT_KERNEL, 2040 }; 2041 2042 cfg.fc_dst = *pfx; 2043 2044 /* Prevent useless cloning on PtP SIT. 2045 This thing is done here expecting that the whole 2046 class of non-broadcast devices need not cloning. 2047 */ 2048 #if IS_ENABLED(CONFIG_IPV6_SIT) 2049 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT)) 2050 cfg.fc_flags |= RTF_NONEXTHOP; 2051 #endif 2052 2053 ip6_route_add(&cfg); 2054 } 2055 2056 2057 static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx, 2058 int plen, 2059 const struct net_device *dev, 2060 u32 flags, u32 noflags) 2061 { 2062 struct fib6_node *fn; 2063 struct rt6_info *rt = NULL; 2064 struct fib6_table *table; 2065 2066 table = fib6_get_table(dev_net(dev), RT6_TABLE_PREFIX); 2067 if (table == NULL) 2068 return NULL; 2069 2070 read_lock_bh(&table->tb6_lock); 2071 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0); 2072 if (!fn) 2073 goto out; 2074 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) { 2075 if (rt->dst.dev->ifindex != dev->ifindex) 2076 continue; 2077 if ((rt->rt6i_flags & flags) != flags) 2078 continue; 2079 if ((rt->rt6i_flags & noflags) != 0) 2080 continue; 2081 dst_hold(&rt->dst); 2082 break; 2083 } 2084 out: 2085 read_unlock_bh(&table->tb6_lock); 2086 return rt; 2087 } 2088 2089 2090 /* Create "default" multicast route to the interface */ 2091 2092 static void addrconf_add_mroute(struct net_device *dev) 2093 { 2094 struct fib6_config cfg = { 2095 .fc_table = RT6_TABLE_LOCAL, 2096 .fc_metric = IP6_RT_PRIO_ADDRCONF, 2097 .fc_ifindex = dev->ifindex, 2098 .fc_dst_len = 8, 2099 .fc_flags = RTF_UP, 2100 .fc_nlinfo.nl_net = dev_net(dev), 2101 }; 2102 2103 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0); 2104 2105 ip6_route_add(&cfg); 2106 } 2107 2108 static struct inet6_dev *addrconf_add_dev(struct net_device *dev) 2109 { 2110 struct inet6_dev *idev; 2111 2112 ASSERT_RTNL(); 2113 2114 idev = ipv6_find_idev(dev); 2115 if (!idev) 2116 return ERR_PTR(-ENOBUFS); 2117 2118 if (idev->cnf.disable_ipv6) 2119 return ERR_PTR(-EACCES); 2120 2121 /* Add default multicast route */ 2122 if (!(dev->flags & IFF_LOOPBACK)) 2123 addrconf_add_mroute(dev); 2124 2125 return idev; 2126 } 2127 2128 static void manage_tempaddrs(struct inet6_dev *idev, 2129 struct inet6_ifaddr *ifp, 2130 __u32 valid_lft, __u32 prefered_lft, 2131 bool create, unsigned long now) 2132 { 2133 u32 flags; 2134 struct inet6_ifaddr *ift; 2135 2136 read_lock_bh(&idev->lock); 2137 /* update all temporary addresses in the list */ 2138 list_for_each_entry(ift, &idev->tempaddr_list, tmp_list) { 2139 int age, max_valid, max_prefered; 2140 2141 if (ifp != ift->ifpub) 2142 continue; 2143 2144 /* RFC 4941 section 3.3: 2145 * If a received option will extend the lifetime of a public 2146 * address, the lifetimes of temporary addresses should 2147 * be extended, subject to the overall constraint that no 2148 * temporary addresses should ever remain "valid" or "preferred" 2149 * for a time longer than (TEMP_VALID_LIFETIME) or 2150 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), respectively. 2151 */ 2152 age = (now - ift->cstamp) / HZ; 2153 max_valid = idev->cnf.temp_valid_lft - age; 2154 if (max_valid < 0) 2155 max_valid = 0; 2156 2157 max_prefered = idev->cnf.temp_prefered_lft - 2158 idev->cnf.max_desync_factor - age; 2159 if (max_prefered < 0) 2160 max_prefered = 0; 2161 2162 if (valid_lft > max_valid) 2163 valid_lft = max_valid; 2164 2165 if (prefered_lft > max_prefered) 2166 prefered_lft = max_prefered; 2167 2168 spin_lock(&ift->lock); 2169 flags = ift->flags; 2170 ift->valid_lft = valid_lft; 2171 ift->prefered_lft = prefered_lft; 2172 ift->tstamp = now; 2173 if (prefered_lft > 0) 2174 ift->flags &= ~IFA_F_DEPRECATED; 2175 2176 spin_unlock(&ift->lock); 2177 if (!(flags&IFA_F_TENTATIVE)) 2178 ipv6_ifa_notify(0, ift); 2179 } 2180 2181 if ((create || list_empty(&idev->tempaddr_list)) && 2182 idev->cnf.use_tempaddr > 0) { 2183 /* When a new public address is created as described 2184 * in [ADDRCONF], also create a new temporary address. 2185 * Also create a temporary address if it's enabled but 2186 * no temporary address currently exists. 2187 */ 2188 read_unlock_bh(&idev->lock); 2189 ipv6_create_tempaddr(ifp, NULL); 2190 } else { 2191 read_unlock_bh(&idev->lock); 2192 } 2193 } 2194 2195 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao) 2196 { 2197 struct prefix_info *pinfo; 2198 __u32 valid_lft; 2199 __u32 prefered_lft; 2200 int addr_type; 2201 u32 addr_flags = 0; 2202 struct inet6_dev *in6_dev; 2203 struct net *net = dev_net(dev); 2204 2205 pinfo = (struct prefix_info *) opt; 2206 2207 if (len < sizeof(struct prefix_info)) { 2208 ADBG("addrconf: prefix option too short\n"); 2209 return; 2210 } 2211 2212 /* 2213 * Validation checks ([ADDRCONF], page 19) 2214 */ 2215 2216 addr_type = ipv6_addr_type(&pinfo->prefix); 2217 2218 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL)) 2219 return; 2220 2221 valid_lft = ntohl(pinfo->valid); 2222 prefered_lft = ntohl(pinfo->prefered); 2223 2224 if (prefered_lft > valid_lft) { 2225 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n"); 2226 return; 2227 } 2228 2229 in6_dev = in6_dev_get(dev); 2230 2231 if (in6_dev == NULL) { 2232 net_dbg_ratelimited("addrconf: device %s not configured\n", 2233 dev->name); 2234 return; 2235 } 2236 2237 /* 2238 * Two things going on here: 2239 * 1) Add routes for on-link prefixes 2240 * 2) Configure prefixes with the auto flag set 2241 */ 2242 2243 if (pinfo->onlink) { 2244 struct rt6_info *rt; 2245 unsigned long rt_expires; 2246 2247 /* Avoid arithmetic overflow. Really, we could 2248 * save rt_expires in seconds, likely valid_lft, 2249 * but it would require division in fib gc, that it 2250 * not good. 2251 */ 2252 if (HZ > USER_HZ) 2253 rt_expires = addrconf_timeout_fixup(valid_lft, HZ); 2254 else 2255 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ); 2256 2257 if (addrconf_finite_timeout(rt_expires)) 2258 rt_expires *= HZ; 2259 2260 rt = addrconf_get_prefix_route(&pinfo->prefix, 2261 pinfo->prefix_len, 2262 dev, 2263 RTF_ADDRCONF | RTF_PREFIX_RT, 2264 RTF_GATEWAY | RTF_DEFAULT); 2265 2266 if (rt) { 2267 /* Autoconf prefix route */ 2268 if (valid_lft == 0) { 2269 ip6_del_rt(rt); 2270 rt = NULL; 2271 } else if (addrconf_finite_timeout(rt_expires)) { 2272 /* not infinity */ 2273 rt6_set_expires(rt, jiffies + rt_expires); 2274 } else { 2275 rt6_clean_expires(rt); 2276 } 2277 } else if (valid_lft) { 2278 clock_t expires = 0; 2279 int flags = RTF_ADDRCONF | RTF_PREFIX_RT; 2280 if (addrconf_finite_timeout(rt_expires)) { 2281 /* not infinity */ 2282 flags |= RTF_EXPIRES; 2283 expires = jiffies_to_clock_t(rt_expires); 2284 } 2285 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len, 2286 dev, expires, flags); 2287 } 2288 ip6_rt_put(rt); 2289 } 2290 2291 /* Try to figure out our local address for this prefix */ 2292 2293 if (pinfo->autoconf && in6_dev->cnf.autoconf) { 2294 struct inet6_ifaddr *ifp; 2295 struct in6_addr addr; 2296 int create = 0, update_lft = 0; 2297 bool tokenized = false; 2298 2299 if (pinfo->prefix_len == 64) { 2300 memcpy(&addr, &pinfo->prefix, 8); 2301 2302 if (!ipv6_addr_any(&in6_dev->token)) { 2303 read_lock_bh(&in6_dev->lock); 2304 memcpy(addr.s6_addr + 8, 2305 in6_dev->token.s6_addr + 8, 8); 2306 read_unlock_bh(&in6_dev->lock); 2307 tokenized = true; 2308 } else if (in6_dev->addr_gen_mode == 2309 IN6_ADDR_GEN_MODE_STABLE_PRIVACY && 2310 !ipv6_generate_stable_address(&addr, 0, 2311 in6_dev)) { 2312 addr_flags |= IFA_F_STABLE_PRIVACY; 2313 goto ok; 2314 } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) && 2315 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) { 2316 in6_dev_put(in6_dev); 2317 return; 2318 } 2319 goto ok; 2320 } 2321 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n", 2322 pinfo->prefix_len); 2323 in6_dev_put(in6_dev); 2324 return; 2325 2326 ok: 2327 2328 ifp = ipv6_get_ifaddr(net, &addr, dev, 1); 2329 2330 if (ifp == NULL && valid_lft) { 2331 int max_addresses = in6_dev->cnf.max_addresses; 2332 2333 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 2334 if (in6_dev->cnf.optimistic_dad && 2335 !net->ipv6.devconf_all->forwarding && sllao) 2336 addr_flags = IFA_F_OPTIMISTIC; 2337 #endif 2338 2339 /* Do not allow to create too much of autoconfigured 2340 * addresses; this would be too easy way to crash kernel. 2341 */ 2342 if (!max_addresses || 2343 ipv6_count_addresses(in6_dev) < max_addresses) 2344 ifp = ipv6_add_addr(in6_dev, &addr, NULL, 2345 pinfo->prefix_len, 2346 addr_type&IPV6_ADDR_SCOPE_MASK, 2347 addr_flags, valid_lft, 2348 prefered_lft); 2349 2350 if (IS_ERR_OR_NULL(ifp)) { 2351 in6_dev_put(in6_dev); 2352 return; 2353 } 2354 2355 update_lft = 0; 2356 create = 1; 2357 spin_lock_bh(&ifp->lock); 2358 ifp->flags |= IFA_F_MANAGETEMPADDR; 2359 ifp->cstamp = jiffies; 2360 ifp->tokenized = tokenized; 2361 spin_unlock_bh(&ifp->lock); 2362 addrconf_dad_start(ifp); 2363 } 2364 2365 if (ifp) { 2366 u32 flags; 2367 unsigned long now; 2368 u32 stored_lft; 2369 2370 /* update lifetime (RFC2462 5.5.3 e) */ 2371 spin_lock_bh(&ifp->lock); 2372 now = jiffies; 2373 if (ifp->valid_lft > (now - ifp->tstamp) / HZ) 2374 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ; 2375 else 2376 stored_lft = 0; 2377 if (!update_lft && !create && stored_lft) { 2378 const u32 minimum_lft = min_t(u32, 2379 stored_lft, MIN_VALID_LIFETIME); 2380 valid_lft = max(valid_lft, minimum_lft); 2381 2382 /* RFC4862 Section 5.5.3e: 2383 * "Note that the preferred lifetime of the 2384 * corresponding address is always reset to 2385 * the Preferred Lifetime in the received 2386 * Prefix Information option, regardless of 2387 * whether the valid lifetime is also reset or 2388 * ignored." 2389 * 2390 * So we should always update prefered_lft here. 2391 */ 2392 update_lft = 1; 2393 } 2394 2395 if (update_lft) { 2396 ifp->valid_lft = valid_lft; 2397 ifp->prefered_lft = prefered_lft; 2398 ifp->tstamp = now; 2399 flags = ifp->flags; 2400 ifp->flags &= ~IFA_F_DEPRECATED; 2401 spin_unlock_bh(&ifp->lock); 2402 2403 if (!(flags&IFA_F_TENTATIVE)) 2404 ipv6_ifa_notify(0, ifp); 2405 } else 2406 spin_unlock_bh(&ifp->lock); 2407 2408 manage_tempaddrs(in6_dev, ifp, valid_lft, prefered_lft, 2409 create, now); 2410 2411 in6_ifa_put(ifp); 2412 addrconf_verify(); 2413 } 2414 } 2415 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo); 2416 in6_dev_put(in6_dev); 2417 } 2418 2419 /* 2420 * Set destination address. 2421 * Special case for SIT interfaces where we create a new "virtual" 2422 * device. 2423 */ 2424 int addrconf_set_dstaddr(struct net *net, void __user *arg) 2425 { 2426 struct in6_ifreq ireq; 2427 struct net_device *dev; 2428 int err = -EINVAL; 2429 2430 rtnl_lock(); 2431 2432 err = -EFAULT; 2433 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2434 goto err_exit; 2435 2436 dev = __dev_get_by_index(net, ireq.ifr6_ifindex); 2437 2438 err = -ENODEV; 2439 if (dev == NULL) 2440 goto err_exit; 2441 2442 #if IS_ENABLED(CONFIG_IPV6_SIT) 2443 if (dev->type == ARPHRD_SIT) { 2444 const struct net_device_ops *ops = dev->netdev_ops; 2445 struct ifreq ifr; 2446 struct ip_tunnel_parm p; 2447 2448 err = -EADDRNOTAVAIL; 2449 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4)) 2450 goto err_exit; 2451 2452 memset(&p, 0, sizeof(p)); 2453 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3]; 2454 p.iph.saddr = 0; 2455 p.iph.version = 4; 2456 p.iph.ihl = 5; 2457 p.iph.protocol = IPPROTO_IPV6; 2458 p.iph.ttl = 64; 2459 ifr.ifr_ifru.ifru_data = (__force void __user *)&p; 2460 2461 if (ops->ndo_do_ioctl) { 2462 mm_segment_t oldfs = get_fs(); 2463 2464 set_fs(KERNEL_DS); 2465 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL); 2466 set_fs(oldfs); 2467 } else 2468 err = -EOPNOTSUPP; 2469 2470 if (err == 0) { 2471 err = -ENOBUFS; 2472 dev = __dev_get_by_name(net, p.name); 2473 if (!dev) 2474 goto err_exit; 2475 err = dev_open(dev); 2476 } 2477 } 2478 #endif 2479 2480 err_exit: 2481 rtnl_unlock(); 2482 return err; 2483 } 2484 2485 static int ipv6_mc_config(struct sock *sk, bool join, 2486 const struct in6_addr *addr, int ifindex) 2487 { 2488 int ret; 2489 2490 ASSERT_RTNL(); 2491 2492 lock_sock(sk); 2493 if (join) 2494 ret = ipv6_sock_mc_join(sk, ifindex, addr); 2495 else 2496 ret = ipv6_sock_mc_drop(sk, ifindex, addr); 2497 release_sock(sk); 2498 2499 return ret; 2500 } 2501 2502 /* 2503 * Manual configuration of address on an interface 2504 */ 2505 static int inet6_addr_add(struct net *net, int ifindex, 2506 const struct in6_addr *pfx, 2507 const struct in6_addr *peer_pfx, 2508 unsigned int plen, __u32 ifa_flags, 2509 __u32 prefered_lft, __u32 valid_lft) 2510 { 2511 struct inet6_ifaddr *ifp; 2512 struct inet6_dev *idev; 2513 struct net_device *dev; 2514 unsigned long timeout; 2515 clock_t expires; 2516 int scope; 2517 u32 flags; 2518 2519 ASSERT_RTNL(); 2520 2521 if (plen > 128) 2522 return -EINVAL; 2523 2524 /* check the lifetime */ 2525 if (!valid_lft || prefered_lft > valid_lft) 2526 return -EINVAL; 2527 2528 if (ifa_flags & IFA_F_MANAGETEMPADDR && plen != 64) 2529 return -EINVAL; 2530 2531 dev = __dev_get_by_index(net, ifindex); 2532 if (!dev) 2533 return -ENODEV; 2534 2535 idev = addrconf_add_dev(dev); 2536 if (IS_ERR(idev)) 2537 return PTR_ERR(idev); 2538 2539 if (ifa_flags & IFA_F_MCAUTOJOIN) { 2540 int ret = ipv6_mc_config(net->ipv6.mc_autojoin_sk, 2541 true, pfx, ifindex); 2542 2543 if (ret < 0) 2544 return ret; 2545 } 2546 2547 scope = ipv6_addr_scope(pfx); 2548 2549 timeout = addrconf_timeout_fixup(valid_lft, HZ); 2550 if (addrconf_finite_timeout(timeout)) { 2551 expires = jiffies_to_clock_t(timeout * HZ); 2552 valid_lft = timeout; 2553 flags = RTF_EXPIRES; 2554 } else { 2555 expires = 0; 2556 flags = 0; 2557 ifa_flags |= IFA_F_PERMANENT; 2558 } 2559 2560 timeout = addrconf_timeout_fixup(prefered_lft, HZ); 2561 if (addrconf_finite_timeout(timeout)) { 2562 if (timeout == 0) 2563 ifa_flags |= IFA_F_DEPRECATED; 2564 prefered_lft = timeout; 2565 } 2566 2567 ifp = ipv6_add_addr(idev, pfx, peer_pfx, plen, scope, ifa_flags, 2568 valid_lft, prefered_lft); 2569 2570 if (!IS_ERR(ifp)) { 2571 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) { 2572 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev, 2573 expires, flags); 2574 } 2575 2576 /* 2577 * Note that section 3.1 of RFC 4429 indicates 2578 * that the Optimistic flag should not be set for 2579 * manually configured addresses 2580 */ 2581 addrconf_dad_start(ifp); 2582 if (ifa_flags & IFA_F_MANAGETEMPADDR) 2583 manage_tempaddrs(idev, ifp, valid_lft, prefered_lft, 2584 true, jiffies); 2585 in6_ifa_put(ifp); 2586 addrconf_verify_rtnl(); 2587 return 0; 2588 } else if (ifa_flags & IFA_F_MCAUTOJOIN) { 2589 ipv6_mc_config(net->ipv6.mc_autojoin_sk, 2590 false, pfx, ifindex); 2591 } 2592 2593 return PTR_ERR(ifp); 2594 } 2595 2596 static int inet6_addr_del(struct net *net, int ifindex, u32 ifa_flags, 2597 const struct in6_addr *pfx, unsigned int plen) 2598 { 2599 struct inet6_ifaddr *ifp; 2600 struct inet6_dev *idev; 2601 struct net_device *dev; 2602 2603 if (plen > 128) 2604 return -EINVAL; 2605 2606 dev = __dev_get_by_index(net, ifindex); 2607 if (!dev) 2608 return -ENODEV; 2609 2610 idev = __in6_dev_get(dev); 2611 if (idev == NULL) 2612 return -ENXIO; 2613 2614 read_lock_bh(&idev->lock); 2615 list_for_each_entry(ifp, &idev->addr_list, if_list) { 2616 if (ifp->prefix_len == plen && 2617 ipv6_addr_equal(pfx, &ifp->addr)) { 2618 in6_ifa_hold(ifp); 2619 read_unlock_bh(&idev->lock); 2620 2621 if (!(ifp->flags & IFA_F_TEMPORARY) && 2622 (ifa_flags & IFA_F_MANAGETEMPADDR)) 2623 manage_tempaddrs(idev, ifp, 0, 0, false, 2624 jiffies); 2625 ipv6_del_addr(ifp); 2626 addrconf_verify_rtnl(); 2627 if (ipv6_addr_is_multicast(pfx)) { 2628 ipv6_mc_config(net->ipv6.mc_autojoin_sk, 2629 false, pfx, dev->ifindex); 2630 } 2631 return 0; 2632 } 2633 } 2634 read_unlock_bh(&idev->lock); 2635 return -EADDRNOTAVAIL; 2636 } 2637 2638 2639 int addrconf_add_ifaddr(struct net *net, void __user *arg) 2640 { 2641 struct in6_ifreq ireq; 2642 int err; 2643 2644 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 2645 return -EPERM; 2646 2647 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2648 return -EFAULT; 2649 2650 rtnl_lock(); 2651 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, NULL, 2652 ireq.ifr6_prefixlen, IFA_F_PERMANENT, 2653 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME); 2654 rtnl_unlock(); 2655 return err; 2656 } 2657 2658 int addrconf_del_ifaddr(struct net *net, void __user *arg) 2659 { 2660 struct in6_ifreq ireq; 2661 int err; 2662 2663 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 2664 return -EPERM; 2665 2666 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2667 return -EFAULT; 2668 2669 rtnl_lock(); 2670 err = inet6_addr_del(net, ireq.ifr6_ifindex, 0, &ireq.ifr6_addr, 2671 ireq.ifr6_prefixlen); 2672 rtnl_unlock(); 2673 return err; 2674 } 2675 2676 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr, 2677 int plen, int scope) 2678 { 2679 struct inet6_ifaddr *ifp; 2680 2681 ifp = ipv6_add_addr(idev, addr, NULL, plen, 2682 scope, IFA_F_PERMANENT, 2683 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME); 2684 if (!IS_ERR(ifp)) { 2685 spin_lock_bh(&ifp->lock); 2686 ifp->flags &= ~IFA_F_TENTATIVE; 2687 spin_unlock_bh(&ifp->lock); 2688 ipv6_ifa_notify(RTM_NEWADDR, ifp); 2689 in6_ifa_put(ifp); 2690 } 2691 } 2692 2693 #if IS_ENABLED(CONFIG_IPV6_SIT) 2694 static void sit_add_v4_addrs(struct inet6_dev *idev) 2695 { 2696 struct in6_addr addr; 2697 struct net_device *dev; 2698 struct net *net = dev_net(idev->dev); 2699 int scope, plen; 2700 u32 pflags = 0; 2701 2702 ASSERT_RTNL(); 2703 2704 memset(&addr, 0, sizeof(struct in6_addr)); 2705 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4); 2706 2707 if (idev->dev->flags&IFF_POINTOPOINT) { 2708 addr.s6_addr32[0] = htonl(0xfe800000); 2709 scope = IFA_LINK; 2710 plen = 64; 2711 } else { 2712 scope = IPV6_ADDR_COMPATv4; 2713 plen = 96; 2714 pflags |= RTF_NONEXTHOP; 2715 } 2716 2717 if (addr.s6_addr32[3]) { 2718 add_addr(idev, &addr, plen, scope); 2719 addrconf_prefix_route(&addr, plen, idev->dev, 0, pflags); 2720 return; 2721 } 2722 2723 for_each_netdev(net, dev) { 2724 struct in_device *in_dev = __in_dev_get_rtnl(dev); 2725 if (in_dev && (dev->flags & IFF_UP)) { 2726 struct in_ifaddr *ifa; 2727 2728 int flag = scope; 2729 2730 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) { 2731 2732 addr.s6_addr32[3] = ifa->ifa_local; 2733 2734 if (ifa->ifa_scope == RT_SCOPE_LINK) 2735 continue; 2736 if (ifa->ifa_scope >= RT_SCOPE_HOST) { 2737 if (idev->dev->flags&IFF_POINTOPOINT) 2738 continue; 2739 flag |= IFA_HOST; 2740 } 2741 2742 add_addr(idev, &addr, plen, flag); 2743 addrconf_prefix_route(&addr, plen, idev->dev, 0, 2744 pflags); 2745 } 2746 } 2747 } 2748 } 2749 #endif 2750 2751 static void init_loopback(struct net_device *dev) 2752 { 2753 struct inet6_dev *idev; 2754 struct net_device *sp_dev; 2755 struct inet6_ifaddr *sp_ifa; 2756 struct rt6_info *sp_rt; 2757 2758 /* ::1 */ 2759 2760 ASSERT_RTNL(); 2761 2762 idev = ipv6_find_idev(dev); 2763 if (idev == NULL) { 2764 pr_debug("%s: add_dev failed\n", __func__); 2765 return; 2766 } 2767 2768 add_addr(idev, &in6addr_loopback, 128, IFA_HOST); 2769 2770 /* Add routes to other interface's IPv6 addresses */ 2771 for_each_netdev(dev_net(dev), sp_dev) { 2772 if (!strcmp(sp_dev->name, dev->name)) 2773 continue; 2774 2775 idev = __in6_dev_get(sp_dev); 2776 if (!idev) 2777 continue; 2778 2779 read_lock_bh(&idev->lock); 2780 list_for_each_entry(sp_ifa, &idev->addr_list, if_list) { 2781 2782 if (sp_ifa->flags & (IFA_F_DADFAILED | IFA_F_TENTATIVE)) 2783 continue; 2784 2785 if (sp_ifa->rt) { 2786 /* This dst has been added to garbage list when 2787 * lo device down, release this obsolete dst and 2788 * reallocate a new router for ifa. 2789 */ 2790 if (sp_ifa->rt->dst.obsolete > 0) { 2791 ip6_rt_put(sp_ifa->rt); 2792 sp_ifa->rt = NULL; 2793 } else { 2794 continue; 2795 } 2796 } 2797 2798 sp_rt = addrconf_dst_alloc(idev, &sp_ifa->addr, false); 2799 2800 /* Failure cases are ignored */ 2801 if (!IS_ERR(sp_rt)) { 2802 sp_ifa->rt = sp_rt; 2803 ip6_ins_rt(sp_rt); 2804 } 2805 } 2806 read_unlock_bh(&idev->lock); 2807 } 2808 } 2809 2810 static void addrconf_add_linklocal(struct inet6_dev *idev, 2811 const struct in6_addr *addr, u32 flags) 2812 { 2813 struct inet6_ifaddr *ifp; 2814 u32 addr_flags = flags | IFA_F_PERMANENT; 2815 2816 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 2817 if (idev->cnf.optimistic_dad && 2818 !dev_net(idev->dev)->ipv6.devconf_all->forwarding) 2819 addr_flags |= IFA_F_OPTIMISTIC; 2820 #endif 2821 2822 ifp = ipv6_add_addr(idev, addr, NULL, 64, IFA_LINK, addr_flags, 2823 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME); 2824 if (!IS_ERR(ifp)) { 2825 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0); 2826 addrconf_dad_start(ifp); 2827 in6_ifa_put(ifp); 2828 } 2829 } 2830 2831 static bool ipv6_reserved_interfaceid(struct in6_addr address) 2832 { 2833 if ((address.s6_addr32[2] | address.s6_addr32[3]) == 0) 2834 return true; 2835 2836 if (address.s6_addr32[2] == htonl(0x02005eff) && 2837 ((address.s6_addr32[3] & htonl(0xfe000000)) == htonl(0xfe000000))) 2838 return true; 2839 2840 if (address.s6_addr32[2] == htonl(0xfdffffff) && 2841 ((address.s6_addr32[3] & htonl(0xffffff80)) == htonl(0xffffff80))) 2842 return true; 2843 2844 return false; 2845 } 2846 2847 static int ipv6_generate_stable_address(struct in6_addr *address, 2848 u8 dad_count, 2849 const struct inet6_dev *idev) 2850 { 2851 static const int idgen_retries = 3; 2852 2853 static DEFINE_SPINLOCK(lock); 2854 static __u32 digest[SHA_DIGEST_WORDS]; 2855 static __u32 workspace[SHA_WORKSPACE_WORDS]; 2856 2857 static union { 2858 char __data[SHA_MESSAGE_BYTES]; 2859 struct { 2860 struct in6_addr secret; 2861 __be64 prefix; 2862 unsigned char hwaddr[MAX_ADDR_LEN]; 2863 u8 dad_count; 2864 } __packed; 2865 } data; 2866 2867 struct in6_addr secret; 2868 struct in6_addr temp; 2869 struct net *net = dev_net(idev->dev); 2870 2871 BUILD_BUG_ON(sizeof(data.__data) != sizeof(data)); 2872 2873 if (idev->cnf.stable_secret.initialized) 2874 secret = idev->cnf.stable_secret.secret; 2875 else if (net->ipv6.devconf_dflt->stable_secret.initialized) 2876 secret = net->ipv6.devconf_dflt->stable_secret.secret; 2877 else 2878 return -1; 2879 2880 retry: 2881 spin_lock_bh(&lock); 2882 2883 sha_init(digest); 2884 memset(&data, 0, sizeof(data)); 2885 memset(workspace, 0, sizeof(workspace)); 2886 memcpy(data.hwaddr, idev->dev->perm_addr, idev->dev->addr_len); 2887 data.prefix = ((__be64)address->s6_addr32[0] << 32) | 2888 (__be64)address->s6_addr32[1]; 2889 data.secret = secret; 2890 data.dad_count = dad_count; 2891 2892 sha_transform(digest, data.__data, workspace); 2893 2894 temp = *address; 2895 temp.s6_addr32[2] = digest[0]; 2896 temp.s6_addr32[3] = digest[1]; 2897 2898 spin_unlock_bh(&lock); 2899 2900 if (ipv6_reserved_interfaceid(temp)) { 2901 dad_count++; 2902 if (dad_count > idgen_retries) 2903 return -1; 2904 goto retry; 2905 } 2906 2907 *address = temp; 2908 return 0; 2909 } 2910 2911 static void addrconf_addr_gen(struct inet6_dev *idev, bool prefix_route) 2912 { 2913 struct in6_addr addr; 2914 2915 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0); 2916 2917 if (idev->addr_gen_mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY) { 2918 if (!ipv6_generate_stable_address(&addr, 0, idev)) 2919 addrconf_add_linklocal(idev, &addr, 2920 IFA_F_STABLE_PRIVACY); 2921 else if (prefix_route) 2922 addrconf_prefix_route(&addr, 64, idev->dev, 0, 0); 2923 } else if (idev->addr_gen_mode == IN6_ADDR_GEN_MODE_EUI64) { 2924 /* addrconf_add_linklocal also adds a prefix_route and we 2925 * only need to care about prefix routes if ipv6_generate_eui64 2926 * couldn't generate one. 2927 */ 2928 if (ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) == 0) 2929 addrconf_add_linklocal(idev, &addr, 0); 2930 else if (prefix_route) 2931 addrconf_prefix_route(&addr, 64, idev->dev, 0, 0); 2932 } 2933 } 2934 2935 static void addrconf_dev_config(struct net_device *dev) 2936 { 2937 struct inet6_dev *idev; 2938 2939 ASSERT_RTNL(); 2940 2941 if ((dev->type != ARPHRD_ETHER) && 2942 (dev->type != ARPHRD_FDDI) && 2943 (dev->type != ARPHRD_ARCNET) && 2944 (dev->type != ARPHRD_INFINIBAND) && 2945 (dev->type != ARPHRD_IEEE802154) && 2946 (dev->type != ARPHRD_IEEE1394) && 2947 (dev->type != ARPHRD_TUNNEL6) && 2948 (dev->type != ARPHRD_6LOWPAN)) { 2949 /* Alas, we support only Ethernet autoconfiguration. */ 2950 return; 2951 } 2952 2953 idev = addrconf_add_dev(dev); 2954 if (IS_ERR(idev)) 2955 return; 2956 2957 addrconf_addr_gen(idev, false); 2958 } 2959 2960 #if IS_ENABLED(CONFIG_IPV6_SIT) 2961 static void addrconf_sit_config(struct net_device *dev) 2962 { 2963 struct inet6_dev *idev; 2964 2965 ASSERT_RTNL(); 2966 2967 /* 2968 * Configure the tunnel with one of our IPv4 2969 * addresses... we should configure all of 2970 * our v4 addrs in the tunnel 2971 */ 2972 2973 idev = ipv6_find_idev(dev); 2974 if (idev == NULL) { 2975 pr_debug("%s: add_dev failed\n", __func__); 2976 return; 2977 } 2978 2979 if (dev->priv_flags & IFF_ISATAP) { 2980 addrconf_addr_gen(idev, false); 2981 return; 2982 } 2983 2984 sit_add_v4_addrs(idev); 2985 2986 if (dev->flags&IFF_POINTOPOINT) 2987 addrconf_add_mroute(dev); 2988 } 2989 #endif 2990 2991 #if IS_ENABLED(CONFIG_NET_IPGRE) 2992 static void addrconf_gre_config(struct net_device *dev) 2993 { 2994 struct inet6_dev *idev; 2995 2996 ASSERT_RTNL(); 2997 2998 idev = ipv6_find_idev(dev); 2999 if (idev == NULL) { 3000 pr_debug("%s: add_dev failed\n", __func__); 3001 return; 3002 } 3003 3004 addrconf_addr_gen(idev, true); 3005 } 3006 #endif 3007 3008 static int addrconf_notify(struct notifier_block *this, unsigned long event, 3009 void *ptr) 3010 { 3011 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 3012 struct inet6_dev *idev = __in6_dev_get(dev); 3013 int run_pending = 0; 3014 int err; 3015 3016 switch (event) { 3017 case NETDEV_REGISTER: 3018 if (!idev && dev->mtu >= IPV6_MIN_MTU) { 3019 idev = ipv6_add_dev(dev); 3020 if (IS_ERR(idev)) 3021 return notifier_from_errno(PTR_ERR(idev)); 3022 } 3023 break; 3024 3025 case NETDEV_UP: 3026 case NETDEV_CHANGE: 3027 if (dev->flags & IFF_SLAVE) 3028 break; 3029 3030 if (idev && idev->cnf.disable_ipv6) 3031 break; 3032 3033 if (event == NETDEV_UP) { 3034 if (!addrconf_qdisc_ok(dev)) { 3035 /* device is not ready yet. */ 3036 pr_info("ADDRCONF(NETDEV_UP): %s: link is not ready\n", 3037 dev->name); 3038 break; 3039 } 3040 3041 if (!idev && dev->mtu >= IPV6_MIN_MTU) 3042 idev = ipv6_add_dev(dev); 3043 3044 if (!IS_ERR_OR_NULL(idev)) { 3045 idev->if_flags |= IF_READY; 3046 run_pending = 1; 3047 } 3048 } else { 3049 if (!addrconf_qdisc_ok(dev)) { 3050 /* device is still not ready. */ 3051 break; 3052 } 3053 3054 if (idev) { 3055 if (idev->if_flags & IF_READY) 3056 /* device is already configured. */ 3057 break; 3058 idev->if_flags |= IF_READY; 3059 } 3060 3061 pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n", 3062 dev->name); 3063 3064 run_pending = 1; 3065 } 3066 3067 switch (dev->type) { 3068 #if IS_ENABLED(CONFIG_IPV6_SIT) 3069 case ARPHRD_SIT: 3070 addrconf_sit_config(dev); 3071 break; 3072 #endif 3073 #if IS_ENABLED(CONFIG_NET_IPGRE) 3074 case ARPHRD_IPGRE: 3075 addrconf_gre_config(dev); 3076 break; 3077 #endif 3078 case ARPHRD_LOOPBACK: 3079 init_loopback(dev); 3080 break; 3081 3082 default: 3083 addrconf_dev_config(dev); 3084 break; 3085 } 3086 3087 if (!IS_ERR_OR_NULL(idev)) { 3088 if (run_pending) 3089 addrconf_dad_run(idev); 3090 3091 /* 3092 * If the MTU changed during the interface down, 3093 * when the interface up, the changed MTU must be 3094 * reflected in the idev as well as routers. 3095 */ 3096 if (idev->cnf.mtu6 != dev->mtu && 3097 dev->mtu >= IPV6_MIN_MTU) { 3098 rt6_mtu_change(dev, dev->mtu); 3099 idev->cnf.mtu6 = dev->mtu; 3100 } 3101 idev->tstamp = jiffies; 3102 inet6_ifinfo_notify(RTM_NEWLINK, idev); 3103 3104 /* 3105 * If the changed mtu during down is lower than 3106 * IPV6_MIN_MTU stop IPv6 on this interface. 3107 */ 3108 if (dev->mtu < IPV6_MIN_MTU) 3109 addrconf_ifdown(dev, 1); 3110 } 3111 break; 3112 3113 case NETDEV_CHANGEMTU: 3114 if (idev && dev->mtu >= IPV6_MIN_MTU) { 3115 rt6_mtu_change(dev, dev->mtu); 3116 idev->cnf.mtu6 = dev->mtu; 3117 break; 3118 } 3119 3120 if (!idev && dev->mtu >= IPV6_MIN_MTU) { 3121 idev = ipv6_add_dev(dev); 3122 if (!IS_ERR(idev)) 3123 break; 3124 } 3125 3126 /* 3127 * if MTU under IPV6_MIN_MTU. 3128 * Stop IPv6 on this interface. 3129 */ 3130 3131 case NETDEV_DOWN: 3132 case NETDEV_UNREGISTER: 3133 /* 3134 * Remove all addresses from this interface. 3135 */ 3136 addrconf_ifdown(dev, event != NETDEV_DOWN); 3137 break; 3138 3139 case NETDEV_CHANGENAME: 3140 if (idev) { 3141 snmp6_unregister_dev(idev); 3142 addrconf_sysctl_unregister(idev); 3143 err = addrconf_sysctl_register(idev); 3144 if (err) 3145 return notifier_from_errno(err); 3146 err = snmp6_register_dev(idev); 3147 if (err) { 3148 addrconf_sysctl_unregister(idev); 3149 return notifier_from_errno(err); 3150 } 3151 } 3152 break; 3153 3154 case NETDEV_PRE_TYPE_CHANGE: 3155 case NETDEV_POST_TYPE_CHANGE: 3156 addrconf_type_change(dev, event); 3157 break; 3158 } 3159 3160 return NOTIFY_OK; 3161 } 3162 3163 /* 3164 * addrconf module should be notified of a device going up 3165 */ 3166 static struct notifier_block ipv6_dev_notf = { 3167 .notifier_call = addrconf_notify, 3168 }; 3169 3170 static void addrconf_type_change(struct net_device *dev, unsigned long event) 3171 { 3172 struct inet6_dev *idev; 3173 ASSERT_RTNL(); 3174 3175 idev = __in6_dev_get(dev); 3176 3177 if (event == NETDEV_POST_TYPE_CHANGE) 3178 ipv6_mc_remap(idev); 3179 else if (event == NETDEV_PRE_TYPE_CHANGE) 3180 ipv6_mc_unmap(idev); 3181 } 3182 3183 static int addrconf_ifdown(struct net_device *dev, int how) 3184 { 3185 struct net *net = dev_net(dev); 3186 struct inet6_dev *idev; 3187 struct inet6_ifaddr *ifa; 3188 int state, i; 3189 3190 ASSERT_RTNL(); 3191 3192 rt6_ifdown(net, dev); 3193 neigh_ifdown(&nd_tbl, dev); 3194 3195 idev = __in6_dev_get(dev); 3196 if (idev == NULL) 3197 return -ENODEV; 3198 3199 /* 3200 * Step 1: remove reference to ipv6 device from parent device. 3201 * Do not dev_put! 3202 */ 3203 if (how) { 3204 idev->dead = 1; 3205 3206 /* protected by rtnl_lock */ 3207 RCU_INIT_POINTER(dev->ip6_ptr, NULL); 3208 3209 /* Step 1.5: remove snmp6 entry */ 3210 snmp6_unregister_dev(idev); 3211 3212 } 3213 3214 /* Step 2: clear hash table */ 3215 for (i = 0; i < IN6_ADDR_HSIZE; i++) { 3216 struct hlist_head *h = &inet6_addr_lst[i]; 3217 3218 spin_lock_bh(&addrconf_hash_lock); 3219 restart: 3220 hlist_for_each_entry_rcu(ifa, h, addr_lst) { 3221 if (ifa->idev == idev) { 3222 hlist_del_init_rcu(&ifa->addr_lst); 3223 addrconf_del_dad_work(ifa); 3224 goto restart; 3225 } 3226 } 3227 spin_unlock_bh(&addrconf_hash_lock); 3228 } 3229 3230 write_lock_bh(&idev->lock); 3231 3232 addrconf_del_rs_timer(idev); 3233 3234 /* Step 2: clear flags for stateless addrconf */ 3235 if (!how) 3236 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY); 3237 3238 if (how && del_timer(&idev->regen_timer)) 3239 in6_dev_put(idev); 3240 3241 /* Step 3: clear tempaddr list */ 3242 while (!list_empty(&idev->tempaddr_list)) { 3243 ifa = list_first_entry(&idev->tempaddr_list, 3244 struct inet6_ifaddr, tmp_list); 3245 list_del(&ifa->tmp_list); 3246 write_unlock_bh(&idev->lock); 3247 spin_lock_bh(&ifa->lock); 3248 3249 if (ifa->ifpub) { 3250 in6_ifa_put(ifa->ifpub); 3251 ifa->ifpub = NULL; 3252 } 3253 spin_unlock_bh(&ifa->lock); 3254 in6_ifa_put(ifa); 3255 write_lock_bh(&idev->lock); 3256 } 3257 3258 while (!list_empty(&idev->addr_list)) { 3259 ifa = list_first_entry(&idev->addr_list, 3260 struct inet6_ifaddr, if_list); 3261 addrconf_del_dad_work(ifa); 3262 3263 list_del(&ifa->if_list); 3264 3265 write_unlock_bh(&idev->lock); 3266 3267 spin_lock_bh(&ifa->lock); 3268 state = ifa->state; 3269 ifa->state = INET6_IFADDR_STATE_DEAD; 3270 spin_unlock_bh(&ifa->lock); 3271 3272 if (state != INET6_IFADDR_STATE_DEAD) { 3273 __ipv6_ifa_notify(RTM_DELADDR, ifa); 3274 inet6addr_notifier_call_chain(NETDEV_DOWN, ifa); 3275 } 3276 in6_ifa_put(ifa); 3277 3278 write_lock_bh(&idev->lock); 3279 } 3280 3281 write_unlock_bh(&idev->lock); 3282 3283 /* Step 5: Discard anycast and multicast list */ 3284 if (how) { 3285 ipv6_ac_destroy_dev(idev); 3286 ipv6_mc_destroy_dev(idev); 3287 } else { 3288 ipv6_mc_down(idev); 3289 } 3290 3291 idev->tstamp = jiffies; 3292 3293 /* Last: Shot the device (if unregistered) */ 3294 if (how) { 3295 addrconf_sysctl_unregister(idev); 3296 neigh_parms_release(&nd_tbl, idev->nd_parms); 3297 neigh_ifdown(&nd_tbl, dev); 3298 in6_dev_put(idev); 3299 } 3300 return 0; 3301 } 3302 3303 static void addrconf_rs_timer(unsigned long data) 3304 { 3305 struct inet6_dev *idev = (struct inet6_dev *)data; 3306 struct net_device *dev = idev->dev; 3307 struct in6_addr lladdr; 3308 3309 write_lock(&idev->lock); 3310 if (idev->dead || !(idev->if_flags & IF_READY)) 3311 goto out; 3312 3313 if (!ipv6_accept_ra(idev)) 3314 goto out; 3315 3316 /* Announcement received after solicitation was sent */ 3317 if (idev->if_flags & IF_RA_RCVD) 3318 goto out; 3319 3320 if (idev->rs_probes++ < idev->cnf.rtr_solicits) { 3321 write_unlock(&idev->lock); 3322 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE)) 3323 ndisc_send_rs(dev, &lladdr, 3324 &in6addr_linklocal_allrouters); 3325 else 3326 goto put; 3327 3328 write_lock(&idev->lock); 3329 /* The wait after the last probe can be shorter */ 3330 addrconf_mod_rs_timer(idev, (idev->rs_probes == 3331 idev->cnf.rtr_solicits) ? 3332 idev->cnf.rtr_solicit_delay : 3333 idev->cnf.rtr_solicit_interval); 3334 } else { 3335 /* 3336 * Note: we do not support deprecated "all on-link" 3337 * assumption any longer. 3338 */ 3339 pr_debug("%s: no IPv6 routers present\n", idev->dev->name); 3340 } 3341 3342 out: 3343 write_unlock(&idev->lock); 3344 put: 3345 in6_dev_put(idev); 3346 } 3347 3348 /* 3349 * Duplicate Address Detection 3350 */ 3351 static void addrconf_dad_kick(struct inet6_ifaddr *ifp) 3352 { 3353 unsigned long rand_num; 3354 struct inet6_dev *idev = ifp->idev; 3355 3356 if (ifp->flags & IFA_F_OPTIMISTIC) 3357 rand_num = 0; 3358 else 3359 rand_num = prandom_u32() % (idev->cnf.rtr_solicit_delay ? : 1); 3360 3361 ifp->dad_probes = idev->cnf.dad_transmits; 3362 addrconf_mod_dad_work(ifp, rand_num); 3363 } 3364 3365 static void addrconf_dad_begin(struct inet6_ifaddr *ifp) 3366 { 3367 struct inet6_dev *idev = ifp->idev; 3368 struct net_device *dev = idev->dev; 3369 3370 addrconf_join_solict(dev, &ifp->addr); 3371 3372 prandom_seed((__force u32) ifp->addr.s6_addr32[3]); 3373 3374 read_lock_bh(&idev->lock); 3375 spin_lock(&ifp->lock); 3376 if (ifp->state == INET6_IFADDR_STATE_DEAD) 3377 goto out; 3378 3379 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) || 3380 idev->cnf.accept_dad < 1 || 3381 !(ifp->flags&IFA_F_TENTATIVE) || 3382 ifp->flags & IFA_F_NODAD) { 3383 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED); 3384 spin_unlock(&ifp->lock); 3385 read_unlock_bh(&idev->lock); 3386 3387 addrconf_dad_completed(ifp); 3388 return; 3389 } 3390 3391 if (!(idev->if_flags & IF_READY)) { 3392 spin_unlock(&ifp->lock); 3393 read_unlock_bh(&idev->lock); 3394 /* 3395 * If the device is not ready: 3396 * - keep it tentative if it is a permanent address. 3397 * - otherwise, kill it. 3398 */ 3399 in6_ifa_hold(ifp); 3400 addrconf_dad_stop(ifp, 0); 3401 return; 3402 } 3403 3404 /* 3405 * Optimistic nodes can start receiving 3406 * Frames right away 3407 */ 3408 if (ifp->flags & IFA_F_OPTIMISTIC) { 3409 ip6_ins_rt(ifp->rt); 3410 if (ipv6_use_optimistic_addr(idev)) { 3411 /* Because optimistic nodes can use this address, 3412 * notify listeners. If DAD fails, RTM_DELADDR is sent. 3413 */ 3414 ipv6_ifa_notify(RTM_NEWADDR, ifp); 3415 } 3416 } 3417 3418 addrconf_dad_kick(ifp); 3419 out: 3420 spin_unlock(&ifp->lock); 3421 read_unlock_bh(&idev->lock); 3422 } 3423 3424 static void addrconf_dad_start(struct inet6_ifaddr *ifp) 3425 { 3426 bool begin_dad = false; 3427 3428 spin_lock_bh(&ifp->lock); 3429 if (ifp->state != INET6_IFADDR_STATE_DEAD) { 3430 ifp->state = INET6_IFADDR_STATE_PREDAD; 3431 begin_dad = true; 3432 } 3433 spin_unlock_bh(&ifp->lock); 3434 3435 if (begin_dad) 3436 addrconf_mod_dad_work(ifp, 0); 3437 } 3438 3439 static void addrconf_dad_work(struct work_struct *w) 3440 { 3441 struct inet6_ifaddr *ifp = container_of(to_delayed_work(w), 3442 struct inet6_ifaddr, 3443 dad_work); 3444 struct inet6_dev *idev = ifp->idev; 3445 struct in6_addr mcaddr; 3446 3447 enum { 3448 DAD_PROCESS, 3449 DAD_BEGIN, 3450 DAD_ABORT, 3451 } action = DAD_PROCESS; 3452 3453 rtnl_lock(); 3454 3455 spin_lock_bh(&ifp->lock); 3456 if (ifp->state == INET6_IFADDR_STATE_PREDAD) { 3457 action = DAD_BEGIN; 3458 ifp->state = INET6_IFADDR_STATE_DAD; 3459 } else if (ifp->state == INET6_IFADDR_STATE_ERRDAD) { 3460 action = DAD_ABORT; 3461 ifp->state = INET6_IFADDR_STATE_POSTDAD; 3462 } 3463 spin_unlock_bh(&ifp->lock); 3464 3465 if (action == DAD_BEGIN) { 3466 addrconf_dad_begin(ifp); 3467 goto out; 3468 } else if (action == DAD_ABORT) { 3469 addrconf_dad_stop(ifp, 1); 3470 goto out; 3471 } 3472 3473 if (!ifp->dad_probes && addrconf_dad_end(ifp)) 3474 goto out; 3475 3476 write_lock_bh(&idev->lock); 3477 if (idev->dead || !(idev->if_flags & IF_READY)) { 3478 write_unlock_bh(&idev->lock); 3479 goto out; 3480 } 3481 3482 spin_lock(&ifp->lock); 3483 if (ifp->state == INET6_IFADDR_STATE_DEAD) { 3484 spin_unlock(&ifp->lock); 3485 write_unlock_bh(&idev->lock); 3486 goto out; 3487 } 3488 3489 if (ifp->dad_probes == 0) { 3490 /* 3491 * DAD was successful 3492 */ 3493 3494 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED); 3495 spin_unlock(&ifp->lock); 3496 write_unlock_bh(&idev->lock); 3497 3498 addrconf_dad_completed(ifp); 3499 3500 goto out; 3501 } 3502 3503 ifp->dad_probes--; 3504 addrconf_mod_dad_work(ifp, 3505 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME)); 3506 spin_unlock(&ifp->lock); 3507 write_unlock_bh(&idev->lock); 3508 3509 /* send a neighbour solicitation for our addr */ 3510 addrconf_addr_solict_mult(&ifp->addr, &mcaddr); 3511 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &in6addr_any); 3512 out: 3513 in6_ifa_put(ifp); 3514 rtnl_unlock(); 3515 } 3516 3517 /* ifp->idev must be at least read locked */ 3518 static bool ipv6_lonely_lladdr(struct inet6_ifaddr *ifp) 3519 { 3520 struct inet6_ifaddr *ifpiter; 3521 struct inet6_dev *idev = ifp->idev; 3522 3523 list_for_each_entry_reverse(ifpiter, &idev->addr_list, if_list) { 3524 if (ifpiter->scope > IFA_LINK) 3525 break; 3526 if (ifp != ifpiter && ifpiter->scope == IFA_LINK && 3527 (ifpiter->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE| 3528 IFA_F_OPTIMISTIC|IFA_F_DADFAILED)) == 3529 IFA_F_PERMANENT) 3530 return false; 3531 } 3532 return true; 3533 } 3534 3535 static void addrconf_dad_completed(struct inet6_ifaddr *ifp) 3536 { 3537 struct net_device *dev = ifp->idev->dev; 3538 struct in6_addr lladdr; 3539 bool send_rs, send_mld; 3540 3541 addrconf_del_dad_work(ifp); 3542 3543 /* 3544 * Configure the address for reception. Now it is valid. 3545 */ 3546 3547 ipv6_ifa_notify(RTM_NEWADDR, ifp); 3548 3549 /* If added prefix is link local and we are prepared to process 3550 router advertisements, start sending router solicitations. 3551 */ 3552 3553 read_lock_bh(&ifp->idev->lock); 3554 send_mld = ifp->scope == IFA_LINK && ipv6_lonely_lladdr(ifp); 3555 send_rs = send_mld && 3556 ipv6_accept_ra(ifp->idev) && 3557 ifp->idev->cnf.rtr_solicits > 0 && 3558 (dev->flags&IFF_LOOPBACK) == 0; 3559 read_unlock_bh(&ifp->idev->lock); 3560 3561 /* While dad is in progress mld report's source address is in6_addrany. 3562 * Resend with proper ll now. 3563 */ 3564 if (send_mld) 3565 ipv6_mc_dad_complete(ifp->idev); 3566 3567 if (send_rs) { 3568 /* 3569 * If a host as already performed a random delay 3570 * [...] as part of DAD [...] there is no need 3571 * to delay again before sending the first RS 3572 */ 3573 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE)) 3574 return; 3575 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters); 3576 3577 write_lock_bh(&ifp->idev->lock); 3578 spin_lock(&ifp->lock); 3579 ifp->idev->rs_probes = 1; 3580 ifp->idev->if_flags |= IF_RS_SENT; 3581 addrconf_mod_rs_timer(ifp->idev, 3582 ifp->idev->cnf.rtr_solicit_interval); 3583 spin_unlock(&ifp->lock); 3584 write_unlock_bh(&ifp->idev->lock); 3585 } 3586 } 3587 3588 static void addrconf_dad_run(struct inet6_dev *idev) 3589 { 3590 struct inet6_ifaddr *ifp; 3591 3592 read_lock_bh(&idev->lock); 3593 list_for_each_entry(ifp, &idev->addr_list, if_list) { 3594 spin_lock(&ifp->lock); 3595 if (ifp->flags & IFA_F_TENTATIVE && 3596 ifp->state == INET6_IFADDR_STATE_DAD) 3597 addrconf_dad_kick(ifp); 3598 spin_unlock(&ifp->lock); 3599 } 3600 read_unlock_bh(&idev->lock); 3601 } 3602 3603 #ifdef CONFIG_PROC_FS 3604 struct if6_iter_state { 3605 struct seq_net_private p; 3606 int bucket; 3607 int offset; 3608 }; 3609 3610 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos) 3611 { 3612 struct inet6_ifaddr *ifa = NULL; 3613 struct if6_iter_state *state = seq->private; 3614 struct net *net = seq_file_net(seq); 3615 int p = 0; 3616 3617 /* initial bucket if pos is 0 */ 3618 if (pos == 0) { 3619 state->bucket = 0; 3620 state->offset = 0; 3621 } 3622 3623 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) { 3624 hlist_for_each_entry_rcu_bh(ifa, &inet6_addr_lst[state->bucket], 3625 addr_lst) { 3626 if (!net_eq(dev_net(ifa->idev->dev), net)) 3627 continue; 3628 /* sync with offset */ 3629 if (p < state->offset) { 3630 p++; 3631 continue; 3632 } 3633 state->offset++; 3634 return ifa; 3635 } 3636 3637 /* prepare for next bucket */ 3638 state->offset = 0; 3639 p = 0; 3640 } 3641 return NULL; 3642 } 3643 3644 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, 3645 struct inet6_ifaddr *ifa) 3646 { 3647 struct if6_iter_state *state = seq->private; 3648 struct net *net = seq_file_net(seq); 3649 3650 hlist_for_each_entry_continue_rcu_bh(ifa, addr_lst) { 3651 if (!net_eq(dev_net(ifa->idev->dev), net)) 3652 continue; 3653 state->offset++; 3654 return ifa; 3655 } 3656 3657 while (++state->bucket < IN6_ADDR_HSIZE) { 3658 state->offset = 0; 3659 hlist_for_each_entry_rcu_bh(ifa, 3660 &inet6_addr_lst[state->bucket], addr_lst) { 3661 if (!net_eq(dev_net(ifa->idev->dev), net)) 3662 continue; 3663 state->offset++; 3664 return ifa; 3665 } 3666 } 3667 3668 return NULL; 3669 } 3670 3671 static void *if6_seq_start(struct seq_file *seq, loff_t *pos) 3672 __acquires(rcu_bh) 3673 { 3674 rcu_read_lock_bh(); 3675 return if6_get_first(seq, *pos); 3676 } 3677 3678 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos) 3679 { 3680 struct inet6_ifaddr *ifa; 3681 3682 ifa = if6_get_next(seq, v); 3683 ++*pos; 3684 return ifa; 3685 } 3686 3687 static void if6_seq_stop(struct seq_file *seq, void *v) 3688 __releases(rcu_bh) 3689 { 3690 rcu_read_unlock_bh(); 3691 } 3692 3693 static int if6_seq_show(struct seq_file *seq, void *v) 3694 { 3695 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v; 3696 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n", 3697 &ifp->addr, 3698 ifp->idev->dev->ifindex, 3699 ifp->prefix_len, 3700 ifp->scope, 3701 (u8) ifp->flags, 3702 ifp->idev->dev->name); 3703 return 0; 3704 } 3705 3706 static const struct seq_operations if6_seq_ops = { 3707 .start = if6_seq_start, 3708 .next = if6_seq_next, 3709 .show = if6_seq_show, 3710 .stop = if6_seq_stop, 3711 }; 3712 3713 static int if6_seq_open(struct inode *inode, struct file *file) 3714 { 3715 return seq_open_net(inode, file, &if6_seq_ops, 3716 sizeof(struct if6_iter_state)); 3717 } 3718 3719 static const struct file_operations if6_fops = { 3720 .owner = THIS_MODULE, 3721 .open = if6_seq_open, 3722 .read = seq_read, 3723 .llseek = seq_lseek, 3724 .release = seq_release_net, 3725 }; 3726 3727 static int __net_init if6_proc_net_init(struct net *net) 3728 { 3729 if (!proc_create("if_inet6", S_IRUGO, net->proc_net, &if6_fops)) 3730 return -ENOMEM; 3731 return 0; 3732 } 3733 3734 static void __net_exit if6_proc_net_exit(struct net *net) 3735 { 3736 remove_proc_entry("if_inet6", net->proc_net); 3737 } 3738 3739 static struct pernet_operations if6_proc_net_ops = { 3740 .init = if6_proc_net_init, 3741 .exit = if6_proc_net_exit, 3742 }; 3743 3744 int __init if6_proc_init(void) 3745 { 3746 return register_pernet_subsys(&if6_proc_net_ops); 3747 } 3748 3749 void if6_proc_exit(void) 3750 { 3751 unregister_pernet_subsys(&if6_proc_net_ops); 3752 } 3753 #endif /* CONFIG_PROC_FS */ 3754 3755 #if IS_ENABLED(CONFIG_IPV6_MIP6) 3756 /* Check if address is a home address configured on any interface. */ 3757 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr) 3758 { 3759 int ret = 0; 3760 struct inet6_ifaddr *ifp = NULL; 3761 unsigned int hash = inet6_addr_hash(addr); 3762 3763 rcu_read_lock_bh(); 3764 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) { 3765 if (!net_eq(dev_net(ifp->idev->dev), net)) 3766 continue; 3767 if (ipv6_addr_equal(&ifp->addr, addr) && 3768 (ifp->flags & IFA_F_HOMEADDRESS)) { 3769 ret = 1; 3770 break; 3771 } 3772 } 3773 rcu_read_unlock_bh(); 3774 return ret; 3775 } 3776 #endif 3777 3778 /* 3779 * Periodic address status verification 3780 */ 3781 3782 static void addrconf_verify_rtnl(void) 3783 { 3784 unsigned long now, next, next_sec, next_sched; 3785 struct inet6_ifaddr *ifp; 3786 int i; 3787 3788 ASSERT_RTNL(); 3789 3790 rcu_read_lock_bh(); 3791 now = jiffies; 3792 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY); 3793 3794 cancel_delayed_work(&addr_chk_work); 3795 3796 for (i = 0; i < IN6_ADDR_HSIZE; i++) { 3797 restart: 3798 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[i], addr_lst) { 3799 unsigned long age; 3800 3801 /* When setting preferred_lft to a value not zero or 3802 * infinity, while valid_lft is infinity 3803 * IFA_F_PERMANENT has a non-infinity life time. 3804 */ 3805 if ((ifp->flags & IFA_F_PERMANENT) && 3806 (ifp->prefered_lft == INFINITY_LIFE_TIME)) 3807 continue; 3808 3809 spin_lock(&ifp->lock); 3810 /* We try to batch several events at once. */ 3811 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ; 3812 3813 if (ifp->valid_lft != INFINITY_LIFE_TIME && 3814 age >= ifp->valid_lft) { 3815 spin_unlock(&ifp->lock); 3816 in6_ifa_hold(ifp); 3817 ipv6_del_addr(ifp); 3818 goto restart; 3819 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) { 3820 spin_unlock(&ifp->lock); 3821 continue; 3822 } else if (age >= ifp->prefered_lft) { 3823 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */ 3824 int deprecate = 0; 3825 3826 if (!(ifp->flags&IFA_F_DEPRECATED)) { 3827 deprecate = 1; 3828 ifp->flags |= IFA_F_DEPRECATED; 3829 } 3830 3831 if ((ifp->valid_lft != INFINITY_LIFE_TIME) && 3832 (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))) 3833 next = ifp->tstamp + ifp->valid_lft * HZ; 3834 3835 spin_unlock(&ifp->lock); 3836 3837 if (deprecate) { 3838 in6_ifa_hold(ifp); 3839 3840 ipv6_ifa_notify(0, ifp); 3841 in6_ifa_put(ifp); 3842 goto restart; 3843 } 3844 } else if ((ifp->flags&IFA_F_TEMPORARY) && 3845 !(ifp->flags&IFA_F_TENTATIVE)) { 3846 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry * 3847 ifp->idev->cnf.dad_transmits * 3848 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME) / HZ; 3849 3850 if (age >= ifp->prefered_lft - regen_advance) { 3851 struct inet6_ifaddr *ifpub = ifp->ifpub; 3852 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 3853 next = ifp->tstamp + ifp->prefered_lft * HZ; 3854 if (!ifp->regen_count && ifpub) { 3855 ifp->regen_count++; 3856 in6_ifa_hold(ifp); 3857 in6_ifa_hold(ifpub); 3858 spin_unlock(&ifp->lock); 3859 3860 spin_lock(&ifpub->lock); 3861 ifpub->regen_count = 0; 3862 spin_unlock(&ifpub->lock); 3863 ipv6_create_tempaddr(ifpub, ifp); 3864 in6_ifa_put(ifpub); 3865 in6_ifa_put(ifp); 3866 goto restart; 3867 } 3868 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next)) 3869 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ; 3870 spin_unlock(&ifp->lock); 3871 } else { 3872 /* ifp->prefered_lft <= ifp->valid_lft */ 3873 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 3874 next = ifp->tstamp + ifp->prefered_lft * HZ; 3875 spin_unlock(&ifp->lock); 3876 } 3877 } 3878 } 3879 3880 next_sec = round_jiffies_up(next); 3881 next_sched = next; 3882 3883 /* If rounded timeout is accurate enough, accept it. */ 3884 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ)) 3885 next_sched = next_sec; 3886 3887 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */ 3888 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX)) 3889 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX; 3890 3891 ADBG(KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n", 3892 now, next, next_sec, next_sched); 3893 mod_delayed_work(addrconf_wq, &addr_chk_work, next_sched - now); 3894 rcu_read_unlock_bh(); 3895 } 3896 3897 static void addrconf_verify_work(struct work_struct *w) 3898 { 3899 rtnl_lock(); 3900 addrconf_verify_rtnl(); 3901 rtnl_unlock(); 3902 } 3903 3904 static void addrconf_verify(void) 3905 { 3906 mod_delayed_work(addrconf_wq, &addr_chk_work, 0); 3907 } 3908 3909 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local, 3910 struct in6_addr **peer_pfx) 3911 { 3912 struct in6_addr *pfx = NULL; 3913 3914 *peer_pfx = NULL; 3915 3916 if (addr) 3917 pfx = nla_data(addr); 3918 3919 if (local) { 3920 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx))) 3921 *peer_pfx = pfx; 3922 pfx = nla_data(local); 3923 } 3924 3925 return pfx; 3926 } 3927 3928 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = { 3929 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) }, 3930 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) }, 3931 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) }, 3932 [IFA_FLAGS] = { .len = sizeof(u32) }, 3933 }; 3934 3935 static int 3936 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh) 3937 { 3938 struct net *net = sock_net(skb->sk); 3939 struct ifaddrmsg *ifm; 3940 struct nlattr *tb[IFA_MAX+1]; 3941 struct in6_addr *pfx, *peer_pfx; 3942 u32 ifa_flags; 3943 int err; 3944 3945 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy); 3946 if (err < 0) 3947 return err; 3948 3949 ifm = nlmsg_data(nlh); 3950 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx); 3951 if (pfx == NULL) 3952 return -EINVAL; 3953 3954 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags; 3955 3956 /* We ignore other flags so far. */ 3957 ifa_flags &= IFA_F_MANAGETEMPADDR; 3958 3959 return inet6_addr_del(net, ifm->ifa_index, ifa_flags, pfx, 3960 ifm->ifa_prefixlen); 3961 } 3962 3963 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u32 ifa_flags, 3964 u32 prefered_lft, u32 valid_lft) 3965 { 3966 u32 flags; 3967 clock_t expires; 3968 unsigned long timeout; 3969 bool was_managetempaddr; 3970 bool had_prefixroute; 3971 3972 ASSERT_RTNL(); 3973 3974 if (!valid_lft || (prefered_lft > valid_lft)) 3975 return -EINVAL; 3976 3977 if (ifa_flags & IFA_F_MANAGETEMPADDR && 3978 (ifp->flags & IFA_F_TEMPORARY || ifp->prefix_len != 64)) 3979 return -EINVAL; 3980 3981 timeout = addrconf_timeout_fixup(valid_lft, HZ); 3982 if (addrconf_finite_timeout(timeout)) { 3983 expires = jiffies_to_clock_t(timeout * HZ); 3984 valid_lft = timeout; 3985 flags = RTF_EXPIRES; 3986 } else { 3987 expires = 0; 3988 flags = 0; 3989 ifa_flags |= IFA_F_PERMANENT; 3990 } 3991 3992 timeout = addrconf_timeout_fixup(prefered_lft, HZ); 3993 if (addrconf_finite_timeout(timeout)) { 3994 if (timeout == 0) 3995 ifa_flags |= IFA_F_DEPRECATED; 3996 prefered_lft = timeout; 3997 } 3998 3999 spin_lock_bh(&ifp->lock); 4000 was_managetempaddr = ifp->flags & IFA_F_MANAGETEMPADDR; 4001 had_prefixroute = ifp->flags & IFA_F_PERMANENT && 4002 !(ifp->flags & IFA_F_NOPREFIXROUTE); 4003 ifp->flags &= ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | 4004 IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR | 4005 IFA_F_NOPREFIXROUTE); 4006 ifp->flags |= ifa_flags; 4007 ifp->tstamp = jiffies; 4008 ifp->valid_lft = valid_lft; 4009 ifp->prefered_lft = prefered_lft; 4010 4011 spin_unlock_bh(&ifp->lock); 4012 if (!(ifp->flags&IFA_F_TENTATIVE)) 4013 ipv6_ifa_notify(0, ifp); 4014 4015 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) { 4016 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev, 4017 expires, flags); 4018 } else if (had_prefixroute) { 4019 enum cleanup_prefix_rt_t action; 4020 unsigned long rt_expires; 4021 4022 write_lock_bh(&ifp->idev->lock); 4023 action = check_cleanup_prefix_route(ifp, &rt_expires); 4024 write_unlock_bh(&ifp->idev->lock); 4025 4026 if (action != CLEANUP_PREFIX_RT_NOP) { 4027 cleanup_prefix_route(ifp, rt_expires, 4028 action == CLEANUP_PREFIX_RT_DEL); 4029 } 4030 } 4031 4032 if (was_managetempaddr || ifp->flags & IFA_F_MANAGETEMPADDR) { 4033 if (was_managetempaddr && !(ifp->flags & IFA_F_MANAGETEMPADDR)) 4034 valid_lft = prefered_lft = 0; 4035 manage_tempaddrs(ifp->idev, ifp, valid_lft, prefered_lft, 4036 !was_managetempaddr, jiffies); 4037 } 4038 4039 addrconf_verify_rtnl(); 4040 4041 return 0; 4042 } 4043 4044 static int 4045 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh) 4046 { 4047 struct net *net = sock_net(skb->sk); 4048 struct ifaddrmsg *ifm; 4049 struct nlattr *tb[IFA_MAX+1]; 4050 struct in6_addr *pfx, *peer_pfx; 4051 struct inet6_ifaddr *ifa; 4052 struct net_device *dev; 4053 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME; 4054 u32 ifa_flags; 4055 int err; 4056 4057 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy); 4058 if (err < 0) 4059 return err; 4060 4061 ifm = nlmsg_data(nlh); 4062 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx); 4063 if (pfx == NULL) 4064 return -EINVAL; 4065 4066 if (tb[IFA_CACHEINFO]) { 4067 struct ifa_cacheinfo *ci; 4068 4069 ci = nla_data(tb[IFA_CACHEINFO]); 4070 valid_lft = ci->ifa_valid; 4071 preferred_lft = ci->ifa_prefered; 4072 } else { 4073 preferred_lft = INFINITY_LIFE_TIME; 4074 valid_lft = INFINITY_LIFE_TIME; 4075 } 4076 4077 dev = __dev_get_by_index(net, ifm->ifa_index); 4078 if (dev == NULL) 4079 return -ENODEV; 4080 4081 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags; 4082 4083 /* We ignore other flags so far. */ 4084 ifa_flags &= IFA_F_NODAD | IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR | 4085 IFA_F_NOPREFIXROUTE | IFA_F_MCAUTOJOIN; 4086 4087 ifa = ipv6_get_ifaddr(net, pfx, dev, 1); 4088 if (ifa == NULL) { 4089 /* 4090 * It would be best to check for !NLM_F_CREATE here but 4091 * userspace already relies on not having to provide this. 4092 */ 4093 return inet6_addr_add(net, ifm->ifa_index, pfx, peer_pfx, 4094 ifm->ifa_prefixlen, ifa_flags, 4095 preferred_lft, valid_lft); 4096 } 4097 4098 if (nlh->nlmsg_flags & NLM_F_EXCL || 4099 !(nlh->nlmsg_flags & NLM_F_REPLACE)) 4100 err = -EEXIST; 4101 else 4102 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft); 4103 4104 in6_ifa_put(ifa); 4105 4106 return err; 4107 } 4108 4109 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u32 flags, 4110 u8 scope, int ifindex) 4111 { 4112 struct ifaddrmsg *ifm; 4113 4114 ifm = nlmsg_data(nlh); 4115 ifm->ifa_family = AF_INET6; 4116 ifm->ifa_prefixlen = prefixlen; 4117 ifm->ifa_flags = flags; 4118 ifm->ifa_scope = scope; 4119 ifm->ifa_index = ifindex; 4120 } 4121 4122 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp, 4123 unsigned long tstamp, u32 preferred, u32 valid) 4124 { 4125 struct ifa_cacheinfo ci; 4126 4127 ci.cstamp = cstamp_delta(cstamp); 4128 ci.tstamp = cstamp_delta(tstamp); 4129 ci.ifa_prefered = preferred; 4130 ci.ifa_valid = valid; 4131 4132 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci); 4133 } 4134 4135 static inline int rt_scope(int ifa_scope) 4136 { 4137 if (ifa_scope & IFA_HOST) 4138 return RT_SCOPE_HOST; 4139 else if (ifa_scope & IFA_LINK) 4140 return RT_SCOPE_LINK; 4141 else if (ifa_scope & IFA_SITE) 4142 return RT_SCOPE_SITE; 4143 else 4144 return RT_SCOPE_UNIVERSE; 4145 } 4146 4147 static inline int inet6_ifaddr_msgsize(void) 4148 { 4149 return NLMSG_ALIGN(sizeof(struct ifaddrmsg)) 4150 + nla_total_size(16) /* IFA_LOCAL */ 4151 + nla_total_size(16) /* IFA_ADDRESS */ 4152 + nla_total_size(sizeof(struct ifa_cacheinfo)) 4153 + nla_total_size(4) /* IFA_FLAGS */; 4154 } 4155 4156 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa, 4157 u32 portid, u32 seq, int event, unsigned int flags) 4158 { 4159 struct nlmsghdr *nlh; 4160 u32 preferred, valid; 4161 4162 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags); 4163 if (nlh == NULL) 4164 return -EMSGSIZE; 4165 4166 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope), 4167 ifa->idev->dev->ifindex); 4168 4169 if (!((ifa->flags&IFA_F_PERMANENT) && 4170 (ifa->prefered_lft == INFINITY_LIFE_TIME))) { 4171 preferred = ifa->prefered_lft; 4172 valid = ifa->valid_lft; 4173 if (preferred != INFINITY_LIFE_TIME) { 4174 long tval = (jiffies - ifa->tstamp)/HZ; 4175 if (preferred > tval) 4176 preferred -= tval; 4177 else 4178 preferred = 0; 4179 if (valid != INFINITY_LIFE_TIME) { 4180 if (valid > tval) 4181 valid -= tval; 4182 else 4183 valid = 0; 4184 } 4185 } 4186 } else { 4187 preferred = INFINITY_LIFE_TIME; 4188 valid = INFINITY_LIFE_TIME; 4189 } 4190 4191 if (!ipv6_addr_any(&ifa->peer_addr)) { 4192 if (nla_put(skb, IFA_LOCAL, 16, &ifa->addr) < 0 || 4193 nla_put(skb, IFA_ADDRESS, 16, &ifa->peer_addr) < 0) 4194 goto error; 4195 } else 4196 if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0) 4197 goto error; 4198 4199 if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) 4200 goto error; 4201 4202 if (nla_put_u32(skb, IFA_FLAGS, ifa->flags) < 0) 4203 goto error; 4204 4205 nlmsg_end(skb, nlh); 4206 return 0; 4207 4208 error: 4209 nlmsg_cancel(skb, nlh); 4210 return -EMSGSIZE; 4211 } 4212 4213 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca, 4214 u32 portid, u32 seq, int event, u16 flags) 4215 { 4216 struct nlmsghdr *nlh; 4217 u8 scope = RT_SCOPE_UNIVERSE; 4218 int ifindex = ifmca->idev->dev->ifindex; 4219 4220 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE) 4221 scope = RT_SCOPE_SITE; 4222 4223 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags); 4224 if (nlh == NULL) 4225 return -EMSGSIZE; 4226 4227 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 4228 if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 || 4229 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp, 4230 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 4231 nlmsg_cancel(skb, nlh); 4232 return -EMSGSIZE; 4233 } 4234 4235 nlmsg_end(skb, nlh); 4236 return 0; 4237 } 4238 4239 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca, 4240 u32 portid, u32 seq, int event, unsigned int flags) 4241 { 4242 struct nlmsghdr *nlh; 4243 u8 scope = RT_SCOPE_UNIVERSE; 4244 int ifindex = ifaca->aca_idev->dev->ifindex; 4245 4246 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE) 4247 scope = RT_SCOPE_SITE; 4248 4249 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags); 4250 if (nlh == NULL) 4251 return -EMSGSIZE; 4252 4253 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 4254 if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 || 4255 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp, 4256 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 4257 nlmsg_cancel(skb, nlh); 4258 return -EMSGSIZE; 4259 } 4260 4261 nlmsg_end(skb, nlh); 4262 return 0; 4263 } 4264 4265 enum addr_type_t { 4266 UNICAST_ADDR, 4267 MULTICAST_ADDR, 4268 ANYCAST_ADDR, 4269 }; 4270 4271 /* called with rcu_read_lock() */ 4272 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb, 4273 struct netlink_callback *cb, enum addr_type_t type, 4274 int s_ip_idx, int *p_ip_idx) 4275 { 4276 struct ifmcaddr6 *ifmca; 4277 struct ifacaddr6 *ifaca; 4278 int err = 1; 4279 int ip_idx = *p_ip_idx; 4280 4281 read_lock_bh(&idev->lock); 4282 switch (type) { 4283 case UNICAST_ADDR: { 4284 struct inet6_ifaddr *ifa; 4285 4286 /* unicast address incl. temp addr */ 4287 list_for_each_entry(ifa, &idev->addr_list, if_list) { 4288 if (++ip_idx < s_ip_idx) 4289 continue; 4290 err = inet6_fill_ifaddr(skb, ifa, 4291 NETLINK_CB(cb->skb).portid, 4292 cb->nlh->nlmsg_seq, 4293 RTM_NEWADDR, 4294 NLM_F_MULTI); 4295 if (err < 0) 4296 break; 4297 nl_dump_check_consistent(cb, nlmsg_hdr(skb)); 4298 } 4299 break; 4300 } 4301 case MULTICAST_ADDR: 4302 /* multicast address */ 4303 for (ifmca = idev->mc_list; ifmca; 4304 ifmca = ifmca->next, ip_idx++) { 4305 if (ip_idx < s_ip_idx) 4306 continue; 4307 err = inet6_fill_ifmcaddr(skb, ifmca, 4308 NETLINK_CB(cb->skb).portid, 4309 cb->nlh->nlmsg_seq, 4310 RTM_GETMULTICAST, 4311 NLM_F_MULTI); 4312 if (err < 0) 4313 break; 4314 } 4315 break; 4316 case ANYCAST_ADDR: 4317 /* anycast address */ 4318 for (ifaca = idev->ac_list; ifaca; 4319 ifaca = ifaca->aca_next, ip_idx++) { 4320 if (ip_idx < s_ip_idx) 4321 continue; 4322 err = inet6_fill_ifacaddr(skb, ifaca, 4323 NETLINK_CB(cb->skb).portid, 4324 cb->nlh->nlmsg_seq, 4325 RTM_GETANYCAST, 4326 NLM_F_MULTI); 4327 if (err < 0) 4328 break; 4329 } 4330 break; 4331 default: 4332 break; 4333 } 4334 read_unlock_bh(&idev->lock); 4335 *p_ip_idx = ip_idx; 4336 return err; 4337 } 4338 4339 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb, 4340 enum addr_type_t type) 4341 { 4342 struct net *net = sock_net(skb->sk); 4343 int h, s_h; 4344 int idx, ip_idx; 4345 int s_idx, s_ip_idx; 4346 struct net_device *dev; 4347 struct inet6_dev *idev; 4348 struct hlist_head *head; 4349 4350 s_h = cb->args[0]; 4351 s_idx = idx = cb->args[1]; 4352 s_ip_idx = ip_idx = cb->args[2]; 4353 4354 rcu_read_lock(); 4355 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ net->dev_base_seq; 4356 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 4357 idx = 0; 4358 head = &net->dev_index_head[h]; 4359 hlist_for_each_entry_rcu(dev, head, index_hlist) { 4360 if (idx < s_idx) 4361 goto cont; 4362 if (h > s_h || idx > s_idx) 4363 s_ip_idx = 0; 4364 ip_idx = 0; 4365 idev = __in6_dev_get(dev); 4366 if (!idev) 4367 goto cont; 4368 4369 if (in6_dump_addrs(idev, skb, cb, type, 4370 s_ip_idx, &ip_idx) < 0) 4371 goto done; 4372 cont: 4373 idx++; 4374 } 4375 } 4376 done: 4377 rcu_read_unlock(); 4378 cb->args[0] = h; 4379 cb->args[1] = idx; 4380 cb->args[2] = ip_idx; 4381 4382 return skb->len; 4383 } 4384 4385 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb) 4386 { 4387 enum addr_type_t type = UNICAST_ADDR; 4388 4389 return inet6_dump_addr(skb, cb, type); 4390 } 4391 4392 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb) 4393 { 4394 enum addr_type_t type = MULTICAST_ADDR; 4395 4396 return inet6_dump_addr(skb, cb, type); 4397 } 4398 4399 4400 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb) 4401 { 4402 enum addr_type_t type = ANYCAST_ADDR; 4403 4404 return inet6_dump_addr(skb, cb, type); 4405 } 4406 4407 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh) 4408 { 4409 struct net *net = sock_net(in_skb->sk); 4410 struct ifaddrmsg *ifm; 4411 struct nlattr *tb[IFA_MAX+1]; 4412 struct in6_addr *addr = NULL, *peer; 4413 struct net_device *dev = NULL; 4414 struct inet6_ifaddr *ifa; 4415 struct sk_buff *skb; 4416 int err; 4417 4418 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy); 4419 if (err < 0) 4420 goto errout; 4421 4422 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer); 4423 if (addr == NULL) { 4424 err = -EINVAL; 4425 goto errout; 4426 } 4427 4428 ifm = nlmsg_data(nlh); 4429 if (ifm->ifa_index) 4430 dev = __dev_get_by_index(net, ifm->ifa_index); 4431 4432 ifa = ipv6_get_ifaddr(net, addr, dev, 1); 4433 if (!ifa) { 4434 err = -EADDRNOTAVAIL; 4435 goto errout; 4436 } 4437 4438 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL); 4439 if (!skb) { 4440 err = -ENOBUFS; 4441 goto errout_ifa; 4442 } 4443 4444 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).portid, 4445 nlh->nlmsg_seq, RTM_NEWADDR, 0); 4446 if (err < 0) { 4447 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 4448 WARN_ON(err == -EMSGSIZE); 4449 kfree_skb(skb); 4450 goto errout_ifa; 4451 } 4452 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid); 4453 errout_ifa: 4454 in6_ifa_put(ifa); 4455 errout: 4456 return err; 4457 } 4458 4459 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa) 4460 { 4461 struct sk_buff *skb; 4462 struct net *net = dev_net(ifa->idev->dev); 4463 int err = -ENOBUFS; 4464 4465 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC); 4466 if (skb == NULL) 4467 goto errout; 4468 4469 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0); 4470 if (err < 0) { 4471 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 4472 WARN_ON(err == -EMSGSIZE); 4473 kfree_skb(skb); 4474 goto errout; 4475 } 4476 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC); 4477 return; 4478 errout: 4479 if (err < 0) 4480 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err); 4481 } 4482 4483 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf, 4484 __s32 *array, int bytes) 4485 { 4486 BUG_ON(bytes < (DEVCONF_MAX * 4)); 4487 4488 memset(array, 0, bytes); 4489 array[DEVCONF_FORWARDING] = cnf->forwarding; 4490 array[DEVCONF_HOPLIMIT] = cnf->hop_limit; 4491 array[DEVCONF_MTU6] = cnf->mtu6; 4492 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra; 4493 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects; 4494 array[DEVCONF_AUTOCONF] = cnf->autoconf; 4495 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits; 4496 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits; 4497 array[DEVCONF_RTR_SOLICIT_INTERVAL] = 4498 jiffies_to_msecs(cnf->rtr_solicit_interval); 4499 array[DEVCONF_RTR_SOLICIT_DELAY] = 4500 jiffies_to_msecs(cnf->rtr_solicit_delay); 4501 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version; 4502 array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] = 4503 jiffies_to_msecs(cnf->mldv1_unsolicited_report_interval); 4504 array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] = 4505 jiffies_to_msecs(cnf->mldv2_unsolicited_report_interval); 4506 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr; 4507 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft; 4508 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft; 4509 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry; 4510 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor; 4511 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses; 4512 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr; 4513 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo; 4514 #ifdef CONFIG_IPV6_ROUTER_PREF 4515 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref; 4516 array[DEVCONF_RTR_PROBE_INTERVAL] = 4517 jiffies_to_msecs(cnf->rtr_probe_interval); 4518 #ifdef CONFIG_IPV6_ROUTE_INFO 4519 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen; 4520 #endif 4521 #endif 4522 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp; 4523 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route; 4524 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 4525 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad; 4526 array[DEVCONF_USE_OPTIMISTIC] = cnf->use_optimistic; 4527 #endif 4528 #ifdef CONFIG_IPV6_MROUTE 4529 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding; 4530 #endif 4531 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6; 4532 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad; 4533 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao; 4534 array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify; 4535 array[DEVCONF_SUPPRESS_FRAG_NDISC] = cnf->suppress_frag_ndisc; 4536 array[DEVCONF_ACCEPT_RA_FROM_LOCAL] = cnf->accept_ra_from_local; 4537 array[DEVCONF_ACCEPT_RA_MTU] = cnf->accept_ra_mtu; 4538 /* we omit DEVCONF_STABLE_SECRET for now */ 4539 } 4540 4541 static inline size_t inet6_ifla6_size(void) 4542 { 4543 return nla_total_size(4) /* IFLA_INET6_FLAGS */ 4544 + nla_total_size(sizeof(struct ifla_cacheinfo)) 4545 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */ 4546 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */ 4547 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */ 4548 + nla_total_size(sizeof(struct in6_addr)); /* IFLA_INET6_TOKEN */ 4549 } 4550 4551 static inline size_t inet6_if_nlmsg_size(void) 4552 { 4553 return NLMSG_ALIGN(sizeof(struct ifinfomsg)) 4554 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */ 4555 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */ 4556 + nla_total_size(4) /* IFLA_MTU */ 4557 + nla_total_size(4) /* IFLA_LINK */ 4558 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */ 4559 } 4560 4561 static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib, 4562 int items, int bytes) 4563 { 4564 int i; 4565 int pad = bytes - sizeof(u64) * items; 4566 BUG_ON(pad < 0); 4567 4568 /* Use put_unaligned() because stats may not be aligned for u64. */ 4569 put_unaligned(items, &stats[0]); 4570 for (i = 1; i < items; i++) 4571 put_unaligned(atomic_long_read(&mib[i]), &stats[i]); 4572 4573 memset(&stats[items], 0, pad); 4574 } 4575 4576 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu *mib, 4577 int items, int bytes, size_t syncpoff) 4578 { 4579 int i; 4580 int pad = bytes - sizeof(u64) * items; 4581 BUG_ON(pad < 0); 4582 4583 /* Use put_unaligned() because stats may not be aligned for u64. */ 4584 put_unaligned(items, &stats[0]); 4585 for (i = 1; i < items; i++) 4586 put_unaligned(snmp_fold_field64(mib, i, syncpoff), &stats[i]); 4587 4588 memset(&stats[items], 0, pad); 4589 } 4590 4591 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype, 4592 int bytes) 4593 { 4594 switch (attrtype) { 4595 case IFLA_INET6_STATS: 4596 __snmp6_fill_stats64(stats, idev->stats.ipv6, 4597 IPSTATS_MIB_MAX, bytes, offsetof(struct ipstats_mib, syncp)); 4598 break; 4599 case IFLA_INET6_ICMP6STATS: 4600 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, ICMP6_MIB_MAX, bytes); 4601 break; 4602 } 4603 } 4604 4605 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev) 4606 { 4607 struct nlattr *nla; 4608 struct ifla_cacheinfo ci; 4609 4610 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags)) 4611 goto nla_put_failure; 4612 ci.max_reasm_len = IPV6_MAXPLEN; 4613 ci.tstamp = cstamp_delta(idev->tstamp); 4614 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time); 4615 ci.retrans_time = jiffies_to_msecs(NEIGH_VAR(idev->nd_parms, RETRANS_TIME)); 4616 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci)) 4617 goto nla_put_failure; 4618 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32)); 4619 if (nla == NULL) 4620 goto nla_put_failure; 4621 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla)); 4622 4623 /* XXX - MC not implemented */ 4624 4625 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64)); 4626 if (nla == NULL) 4627 goto nla_put_failure; 4628 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla)); 4629 4630 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64)); 4631 if (nla == NULL) 4632 goto nla_put_failure; 4633 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla)); 4634 4635 nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr)); 4636 if (nla == NULL) 4637 goto nla_put_failure; 4638 4639 if (nla_put_u8(skb, IFLA_INET6_ADDR_GEN_MODE, idev->addr_gen_mode)) 4640 goto nla_put_failure; 4641 4642 read_lock_bh(&idev->lock); 4643 memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla)); 4644 read_unlock_bh(&idev->lock); 4645 4646 return 0; 4647 4648 nla_put_failure: 4649 return -EMSGSIZE; 4650 } 4651 4652 static size_t inet6_get_link_af_size(const struct net_device *dev) 4653 { 4654 if (!__in6_dev_get(dev)) 4655 return 0; 4656 4657 return inet6_ifla6_size(); 4658 } 4659 4660 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev) 4661 { 4662 struct inet6_dev *idev = __in6_dev_get(dev); 4663 4664 if (!idev) 4665 return -ENODATA; 4666 4667 if (inet6_fill_ifla6_attrs(skb, idev) < 0) 4668 return -EMSGSIZE; 4669 4670 return 0; 4671 } 4672 4673 static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token) 4674 { 4675 struct inet6_ifaddr *ifp; 4676 struct net_device *dev = idev->dev; 4677 bool update_rs = false; 4678 struct in6_addr ll_addr; 4679 4680 ASSERT_RTNL(); 4681 4682 if (token == NULL) 4683 return -EINVAL; 4684 if (ipv6_addr_any(token)) 4685 return -EINVAL; 4686 if (dev->flags & (IFF_LOOPBACK | IFF_NOARP)) 4687 return -EINVAL; 4688 if (!ipv6_accept_ra(idev)) 4689 return -EINVAL; 4690 if (idev->cnf.rtr_solicits <= 0) 4691 return -EINVAL; 4692 4693 write_lock_bh(&idev->lock); 4694 4695 BUILD_BUG_ON(sizeof(token->s6_addr) != 16); 4696 memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8); 4697 4698 write_unlock_bh(&idev->lock); 4699 4700 if (!idev->dead && (idev->if_flags & IF_READY) && 4701 !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE | 4702 IFA_F_OPTIMISTIC)) { 4703 4704 /* If we're not ready, then normal ifup will take care 4705 * of this. Otherwise, we need to request our rs here. 4706 */ 4707 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters); 4708 update_rs = true; 4709 } 4710 4711 write_lock_bh(&idev->lock); 4712 4713 if (update_rs) { 4714 idev->if_flags |= IF_RS_SENT; 4715 idev->rs_probes = 1; 4716 addrconf_mod_rs_timer(idev, idev->cnf.rtr_solicit_interval); 4717 } 4718 4719 /* Well, that's kinda nasty ... */ 4720 list_for_each_entry(ifp, &idev->addr_list, if_list) { 4721 spin_lock(&ifp->lock); 4722 if (ifp->tokenized) { 4723 ifp->valid_lft = 0; 4724 ifp->prefered_lft = 0; 4725 } 4726 spin_unlock(&ifp->lock); 4727 } 4728 4729 write_unlock_bh(&idev->lock); 4730 inet6_ifinfo_notify(RTM_NEWLINK, idev); 4731 addrconf_verify_rtnl(); 4732 return 0; 4733 } 4734 4735 static const struct nla_policy inet6_af_policy[IFLA_INET6_MAX + 1] = { 4736 [IFLA_INET6_ADDR_GEN_MODE] = { .type = NLA_U8 }, 4737 [IFLA_INET6_TOKEN] = { .len = sizeof(struct in6_addr) }, 4738 }; 4739 4740 static int inet6_validate_link_af(const struct net_device *dev, 4741 const struct nlattr *nla) 4742 { 4743 struct nlattr *tb[IFLA_INET6_MAX + 1]; 4744 4745 if (dev && !__in6_dev_get(dev)) 4746 return -EAFNOSUPPORT; 4747 4748 return nla_parse_nested(tb, IFLA_INET6_MAX, nla, inet6_af_policy); 4749 } 4750 4751 static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla) 4752 { 4753 int err = -EINVAL; 4754 struct inet6_dev *idev = __in6_dev_get(dev); 4755 struct nlattr *tb[IFLA_INET6_MAX + 1]; 4756 4757 if (!idev) 4758 return -EAFNOSUPPORT; 4759 4760 if (nla_parse_nested(tb, IFLA_INET6_MAX, nla, NULL) < 0) 4761 BUG(); 4762 4763 if (tb[IFLA_INET6_TOKEN]) { 4764 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN])); 4765 if (err) 4766 return err; 4767 } 4768 4769 if (tb[IFLA_INET6_ADDR_GEN_MODE]) { 4770 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]); 4771 4772 if (mode != IN6_ADDR_GEN_MODE_EUI64 && 4773 mode != IN6_ADDR_GEN_MODE_NONE && 4774 mode != IN6_ADDR_GEN_MODE_STABLE_PRIVACY) 4775 return -EINVAL; 4776 4777 if (mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY && 4778 !idev->cnf.stable_secret.initialized && 4779 !dev_net(dev)->ipv6.devconf_dflt->stable_secret.initialized) 4780 return -EINVAL; 4781 4782 idev->addr_gen_mode = mode; 4783 err = 0; 4784 } 4785 4786 return err; 4787 } 4788 4789 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev, 4790 u32 portid, u32 seq, int event, unsigned int flags) 4791 { 4792 struct net_device *dev = idev->dev; 4793 struct ifinfomsg *hdr; 4794 struct nlmsghdr *nlh; 4795 void *protoinfo; 4796 4797 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags); 4798 if (nlh == NULL) 4799 return -EMSGSIZE; 4800 4801 hdr = nlmsg_data(nlh); 4802 hdr->ifi_family = AF_INET6; 4803 hdr->__ifi_pad = 0; 4804 hdr->ifi_type = dev->type; 4805 hdr->ifi_index = dev->ifindex; 4806 hdr->ifi_flags = dev_get_flags(dev); 4807 hdr->ifi_change = 0; 4808 4809 if (nla_put_string(skb, IFLA_IFNAME, dev->name) || 4810 (dev->addr_len && 4811 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) || 4812 nla_put_u32(skb, IFLA_MTU, dev->mtu) || 4813 (dev->ifindex != dev->iflink && 4814 nla_put_u32(skb, IFLA_LINK, dev->iflink))) 4815 goto nla_put_failure; 4816 protoinfo = nla_nest_start(skb, IFLA_PROTINFO); 4817 if (protoinfo == NULL) 4818 goto nla_put_failure; 4819 4820 if (inet6_fill_ifla6_attrs(skb, idev) < 0) 4821 goto nla_put_failure; 4822 4823 nla_nest_end(skb, protoinfo); 4824 nlmsg_end(skb, nlh); 4825 return 0; 4826 4827 nla_put_failure: 4828 nlmsg_cancel(skb, nlh); 4829 return -EMSGSIZE; 4830 } 4831 4832 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb) 4833 { 4834 struct net *net = sock_net(skb->sk); 4835 int h, s_h; 4836 int idx = 0, s_idx; 4837 struct net_device *dev; 4838 struct inet6_dev *idev; 4839 struct hlist_head *head; 4840 4841 s_h = cb->args[0]; 4842 s_idx = cb->args[1]; 4843 4844 rcu_read_lock(); 4845 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 4846 idx = 0; 4847 head = &net->dev_index_head[h]; 4848 hlist_for_each_entry_rcu(dev, head, index_hlist) { 4849 if (idx < s_idx) 4850 goto cont; 4851 idev = __in6_dev_get(dev); 4852 if (!idev) 4853 goto cont; 4854 if (inet6_fill_ifinfo(skb, idev, 4855 NETLINK_CB(cb->skb).portid, 4856 cb->nlh->nlmsg_seq, 4857 RTM_NEWLINK, NLM_F_MULTI) < 0) 4858 goto out; 4859 cont: 4860 idx++; 4861 } 4862 } 4863 out: 4864 rcu_read_unlock(); 4865 cb->args[1] = idx; 4866 cb->args[0] = h; 4867 4868 return skb->len; 4869 } 4870 4871 void inet6_ifinfo_notify(int event, struct inet6_dev *idev) 4872 { 4873 struct sk_buff *skb; 4874 struct net *net = dev_net(idev->dev); 4875 int err = -ENOBUFS; 4876 4877 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC); 4878 if (skb == NULL) 4879 goto errout; 4880 4881 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0); 4882 if (err < 0) { 4883 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */ 4884 WARN_ON(err == -EMSGSIZE); 4885 kfree_skb(skb); 4886 goto errout; 4887 } 4888 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC); 4889 return; 4890 errout: 4891 if (err < 0) 4892 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err); 4893 } 4894 4895 static inline size_t inet6_prefix_nlmsg_size(void) 4896 { 4897 return NLMSG_ALIGN(sizeof(struct prefixmsg)) 4898 + nla_total_size(sizeof(struct in6_addr)) 4899 + nla_total_size(sizeof(struct prefix_cacheinfo)); 4900 } 4901 4902 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev, 4903 struct prefix_info *pinfo, u32 portid, u32 seq, 4904 int event, unsigned int flags) 4905 { 4906 struct prefixmsg *pmsg; 4907 struct nlmsghdr *nlh; 4908 struct prefix_cacheinfo ci; 4909 4910 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags); 4911 if (nlh == NULL) 4912 return -EMSGSIZE; 4913 4914 pmsg = nlmsg_data(nlh); 4915 pmsg->prefix_family = AF_INET6; 4916 pmsg->prefix_pad1 = 0; 4917 pmsg->prefix_pad2 = 0; 4918 pmsg->prefix_ifindex = idev->dev->ifindex; 4919 pmsg->prefix_len = pinfo->prefix_len; 4920 pmsg->prefix_type = pinfo->type; 4921 pmsg->prefix_pad3 = 0; 4922 pmsg->prefix_flags = 0; 4923 if (pinfo->onlink) 4924 pmsg->prefix_flags |= IF_PREFIX_ONLINK; 4925 if (pinfo->autoconf) 4926 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF; 4927 4928 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix)) 4929 goto nla_put_failure; 4930 ci.preferred_time = ntohl(pinfo->prefered); 4931 ci.valid_time = ntohl(pinfo->valid); 4932 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci)) 4933 goto nla_put_failure; 4934 nlmsg_end(skb, nlh); 4935 return 0; 4936 4937 nla_put_failure: 4938 nlmsg_cancel(skb, nlh); 4939 return -EMSGSIZE; 4940 } 4941 4942 static void inet6_prefix_notify(int event, struct inet6_dev *idev, 4943 struct prefix_info *pinfo) 4944 { 4945 struct sk_buff *skb; 4946 struct net *net = dev_net(idev->dev); 4947 int err = -ENOBUFS; 4948 4949 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC); 4950 if (skb == NULL) 4951 goto errout; 4952 4953 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0); 4954 if (err < 0) { 4955 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */ 4956 WARN_ON(err == -EMSGSIZE); 4957 kfree_skb(skb); 4958 goto errout; 4959 } 4960 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC); 4961 return; 4962 errout: 4963 if (err < 0) 4964 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err); 4965 } 4966 4967 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 4968 { 4969 struct net *net = dev_net(ifp->idev->dev); 4970 4971 if (event) 4972 ASSERT_RTNL(); 4973 4974 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp); 4975 4976 switch (event) { 4977 case RTM_NEWADDR: 4978 /* 4979 * If the address was optimistic 4980 * we inserted the route at the start of 4981 * our DAD process, so we don't need 4982 * to do it again 4983 */ 4984 if (!(ifp->rt->rt6i_node)) 4985 ip6_ins_rt(ifp->rt); 4986 if (ifp->idev->cnf.forwarding) 4987 addrconf_join_anycast(ifp); 4988 if (!ipv6_addr_any(&ifp->peer_addr)) 4989 addrconf_prefix_route(&ifp->peer_addr, 128, 4990 ifp->idev->dev, 0, 0); 4991 break; 4992 case RTM_DELADDR: 4993 if (ifp->idev->cnf.forwarding) 4994 addrconf_leave_anycast(ifp); 4995 addrconf_leave_solict(ifp->idev, &ifp->addr); 4996 if (!ipv6_addr_any(&ifp->peer_addr)) { 4997 struct rt6_info *rt; 4998 4999 rt = addrconf_get_prefix_route(&ifp->peer_addr, 128, 5000 ifp->idev->dev, 0, 0); 5001 if (rt && ip6_del_rt(rt)) 5002 dst_free(&rt->dst); 5003 } 5004 dst_hold(&ifp->rt->dst); 5005 5006 if (ip6_del_rt(ifp->rt)) 5007 dst_free(&ifp->rt->dst); 5008 5009 rt_genid_bump_ipv6(net); 5010 break; 5011 } 5012 atomic_inc(&net->ipv6.dev_addr_genid); 5013 } 5014 5015 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 5016 { 5017 rcu_read_lock_bh(); 5018 if (likely(ifp->idev->dead == 0)) 5019 __ipv6_ifa_notify(event, ifp); 5020 rcu_read_unlock_bh(); 5021 } 5022 5023 #ifdef CONFIG_SYSCTL 5024 5025 static 5026 int addrconf_sysctl_forward(struct ctl_table *ctl, int write, 5027 void __user *buffer, size_t *lenp, loff_t *ppos) 5028 { 5029 int *valp = ctl->data; 5030 int val = *valp; 5031 loff_t pos = *ppos; 5032 struct ctl_table lctl; 5033 int ret; 5034 5035 /* 5036 * ctl->data points to idev->cnf.forwarding, we should 5037 * not modify it until we get the rtnl lock. 5038 */ 5039 lctl = *ctl; 5040 lctl.data = &val; 5041 5042 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 5043 5044 if (write) 5045 ret = addrconf_fixup_forwarding(ctl, valp, val); 5046 if (ret) 5047 *ppos = pos; 5048 return ret; 5049 } 5050 5051 static 5052 int addrconf_sysctl_mtu(struct ctl_table *ctl, int write, 5053 void __user *buffer, size_t *lenp, loff_t *ppos) 5054 { 5055 struct inet6_dev *idev = ctl->extra1; 5056 int min_mtu = IPV6_MIN_MTU; 5057 struct ctl_table lctl; 5058 5059 lctl = *ctl; 5060 lctl.extra1 = &min_mtu; 5061 lctl.extra2 = idev ? &idev->dev->mtu : NULL; 5062 5063 return proc_dointvec_minmax(&lctl, write, buffer, lenp, ppos); 5064 } 5065 5066 static void dev_disable_change(struct inet6_dev *idev) 5067 { 5068 struct netdev_notifier_info info; 5069 5070 if (!idev || !idev->dev) 5071 return; 5072 5073 netdev_notifier_info_init(&info, idev->dev); 5074 if (idev->cnf.disable_ipv6) 5075 addrconf_notify(NULL, NETDEV_DOWN, &info); 5076 else 5077 addrconf_notify(NULL, NETDEV_UP, &info); 5078 } 5079 5080 static void addrconf_disable_change(struct net *net, __s32 newf) 5081 { 5082 struct net_device *dev; 5083 struct inet6_dev *idev; 5084 5085 rcu_read_lock(); 5086 for_each_netdev_rcu(net, dev) { 5087 idev = __in6_dev_get(dev); 5088 if (idev) { 5089 int changed = (!idev->cnf.disable_ipv6) ^ (!newf); 5090 idev->cnf.disable_ipv6 = newf; 5091 if (changed) 5092 dev_disable_change(idev); 5093 } 5094 } 5095 rcu_read_unlock(); 5096 } 5097 5098 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf) 5099 { 5100 struct net *net; 5101 int old; 5102 5103 if (!rtnl_trylock()) 5104 return restart_syscall(); 5105 5106 net = (struct net *)table->extra2; 5107 old = *p; 5108 *p = newf; 5109 5110 if (p == &net->ipv6.devconf_dflt->disable_ipv6) { 5111 rtnl_unlock(); 5112 return 0; 5113 } 5114 5115 if (p == &net->ipv6.devconf_all->disable_ipv6) { 5116 net->ipv6.devconf_dflt->disable_ipv6 = newf; 5117 addrconf_disable_change(net, newf); 5118 } else if ((!newf) ^ (!old)) 5119 dev_disable_change((struct inet6_dev *)table->extra1); 5120 5121 rtnl_unlock(); 5122 return 0; 5123 } 5124 5125 static 5126 int addrconf_sysctl_disable(struct ctl_table *ctl, int write, 5127 void __user *buffer, size_t *lenp, loff_t *ppos) 5128 { 5129 int *valp = ctl->data; 5130 int val = *valp; 5131 loff_t pos = *ppos; 5132 struct ctl_table lctl; 5133 int ret; 5134 5135 /* 5136 * ctl->data points to idev->cnf.disable_ipv6, we should 5137 * not modify it until we get the rtnl lock. 5138 */ 5139 lctl = *ctl; 5140 lctl.data = &val; 5141 5142 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 5143 5144 if (write) 5145 ret = addrconf_disable_ipv6(ctl, valp, val); 5146 if (ret) 5147 *ppos = pos; 5148 return ret; 5149 } 5150 5151 static 5152 int addrconf_sysctl_proxy_ndp(struct ctl_table *ctl, int write, 5153 void __user *buffer, size_t *lenp, loff_t *ppos) 5154 { 5155 int *valp = ctl->data; 5156 int ret; 5157 int old, new; 5158 5159 old = *valp; 5160 ret = proc_dointvec(ctl, write, buffer, lenp, ppos); 5161 new = *valp; 5162 5163 if (write && old != new) { 5164 struct net *net = ctl->extra2; 5165 5166 if (!rtnl_trylock()) 5167 return restart_syscall(); 5168 5169 if (valp == &net->ipv6.devconf_dflt->proxy_ndp) 5170 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH, 5171 NETCONFA_IFINDEX_DEFAULT, 5172 net->ipv6.devconf_dflt); 5173 else if (valp == &net->ipv6.devconf_all->proxy_ndp) 5174 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH, 5175 NETCONFA_IFINDEX_ALL, 5176 net->ipv6.devconf_all); 5177 else { 5178 struct inet6_dev *idev = ctl->extra1; 5179 5180 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH, 5181 idev->dev->ifindex, 5182 &idev->cnf); 5183 } 5184 rtnl_unlock(); 5185 } 5186 5187 return ret; 5188 } 5189 5190 static int addrconf_sysctl_stable_secret(struct ctl_table *ctl, int write, 5191 void __user *buffer, size_t *lenp, 5192 loff_t *ppos) 5193 { 5194 int err; 5195 struct in6_addr addr; 5196 char str[IPV6_MAX_STRLEN]; 5197 struct ctl_table lctl = *ctl; 5198 struct net *net = ctl->extra2; 5199 struct ipv6_stable_secret *secret = ctl->data; 5200 5201 if (&net->ipv6.devconf_all->stable_secret == ctl->data) 5202 return -EIO; 5203 5204 lctl.maxlen = IPV6_MAX_STRLEN; 5205 lctl.data = str; 5206 5207 if (!rtnl_trylock()) 5208 return restart_syscall(); 5209 5210 if (!write && !secret->initialized) { 5211 err = -EIO; 5212 goto out; 5213 } 5214 5215 if (!write) { 5216 err = snprintf(str, sizeof(str), "%pI6", 5217 &secret->secret); 5218 if (err >= sizeof(str)) { 5219 err = -EIO; 5220 goto out; 5221 } 5222 } 5223 5224 err = proc_dostring(&lctl, write, buffer, lenp, ppos); 5225 if (err || !write) 5226 goto out; 5227 5228 if (in6_pton(str, -1, addr.in6_u.u6_addr8, -1, NULL) != 1) { 5229 err = -EIO; 5230 goto out; 5231 } 5232 5233 secret->initialized = true; 5234 secret->secret = addr; 5235 5236 if (&net->ipv6.devconf_dflt->stable_secret == ctl->data) { 5237 struct net_device *dev; 5238 5239 for_each_netdev(net, dev) { 5240 struct inet6_dev *idev = __in6_dev_get(dev); 5241 5242 if (idev) { 5243 idev->addr_gen_mode = 5244 IN6_ADDR_GEN_MODE_STABLE_PRIVACY; 5245 } 5246 } 5247 } else { 5248 struct inet6_dev *idev = ctl->extra1; 5249 5250 idev->addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY; 5251 } 5252 5253 out: 5254 rtnl_unlock(); 5255 5256 return err; 5257 } 5258 5259 static struct addrconf_sysctl_table 5260 { 5261 struct ctl_table_header *sysctl_header; 5262 struct ctl_table addrconf_vars[DEVCONF_MAX+1]; 5263 } addrconf_sysctl __read_mostly = { 5264 .sysctl_header = NULL, 5265 .addrconf_vars = { 5266 { 5267 .procname = "forwarding", 5268 .data = &ipv6_devconf.forwarding, 5269 .maxlen = sizeof(int), 5270 .mode = 0644, 5271 .proc_handler = addrconf_sysctl_forward, 5272 }, 5273 { 5274 .procname = "hop_limit", 5275 .data = &ipv6_devconf.hop_limit, 5276 .maxlen = sizeof(int), 5277 .mode = 0644, 5278 .proc_handler = proc_dointvec, 5279 }, 5280 { 5281 .procname = "mtu", 5282 .data = &ipv6_devconf.mtu6, 5283 .maxlen = sizeof(int), 5284 .mode = 0644, 5285 .proc_handler = addrconf_sysctl_mtu, 5286 }, 5287 { 5288 .procname = "accept_ra", 5289 .data = &ipv6_devconf.accept_ra, 5290 .maxlen = sizeof(int), 5291 .mode = 0644, 5292 .proc_handler = proc_dointvec, 5293 }, 5294 { 5295 .procname = "accept_redirects", 5296 .data = &ipv6_devconf.accept_redirects, 5297 .maxlen = sizeof(int), 5298 .mode = 0644, 5299 .proc_handler = proc_dointvec, 5300 }, 5301 { 5302 .procname = "autoconf", 5303 .data = &ipv6_devconf.autoconf, 5304 .maxlen = sizeof(int), 5305 .mode = 0644, 5306 .proc_handler = proc_dointvec, 5307 }, 5308 { 5309 .procname = "dad_transmits", 5310 .data = &ipv6_devconf.dad_transmits, 5311 .maxlen = sizeof(int), 5312 .mode = 0644, 5313 .proc_handler = proc_dointvec, 5314 }, 5315 { 5316 .procname = "router_solicitations", 5317 .data = &ipv6_devconf.rtr_solicits, 5318 .maxlen = sizeof(int), 5319 .mode = 0644, 5320 .proc_handler = proc_dointvec, 5321 }, 5322 { 5323 .procname = "router_solicitation_interval", 5324 .data = &ipv6_devconf.rtr_solicit_interval, 5325 .maxlen = sizeof(int), 5326 .mode = 0644, 5327 .proc_handler = proc_dointvec_jiffies, 5328 }, 5329 { 5330 .procname = "router_solicitation_delay", 5331 .data = &ipv6_devconf.rtr_solicit_delay, 5332 .maxlen = sizeof(int), 5333 .mode = 0644, 5334 .proc_handler = proc_dointvec_jiffies, 5335 }, 5336 { 5337 .procname = "force_mld_version", 5338 .data = &ipv6_devconf.force_mld_version, 5339 .maxlen = sizeof(int), 5340 .mode = 0644, 5341 .proc_handler = proc_dointvec, 5342 }, 5343 { 5344 .procname = "mldv1_unsolicited_report_interval", 5345 .data = 5346 &ipv6_devconf.mldv1_unsolicited_report_interval, 5347 .maxlen = sizeof(int), 5348 .mode = 0644, 5349 .proc_handler = proc_dointvec_ms_jiffies, 5350 }, 5351 { 5352 .procname = "mldv2_unsolicited_report_interval", 5353 .data = 5354 &ipv6_devconf.mldv2_unsolicited_report_interval, 5355 .maxlen = sizeof(int), 5356 .mode = 0644, 5357 .proc_handler = proc_dointvec_ms_jiffies, 5358 }, 5359 { 5360 .procname = "use_tempaddr", 5361 .data = &ipv6_devconf.use_tempaddr, 5362 .maxlen = sizeof(int), 5363 .mode = 0644, 5364 .proc_handler = proc_dointvec, 5365 }, 5366 { 5367 .procname = "temp_valid_lft", 5368 .data = &ipv6_devconf.temp_valid_lft, 5369 .maxlen = sizeof(int), 5370 .mode = 0644, 5371 .proc_handler = proc_dointvec, 5372 }, 5373 { 5374 .procname = "temp_prefered_lft", 5375 .data = &ipv6_devconf.temp_prefered_lft, 5376 .maxlen = sizeof(int), 5377 .mode = 0644, 5378 .proc_handler = proc_dointvec, 5379 }, 5380 { 5381 .procname = "regen_max_retry", 5382 .data = &ipv6_devconf.regen_max_retry, 5383 .maxlen = sizeof(int), 5384 .mode = 0644, 5385 .proc_handler = proc_dointvec, 5386 }, 5387 { 5388 .procname = "max_desync_factor", 5389 .data = &ipv6_devconf.max_desync_factor, 5390 .maxlen = sizeof(int), 5391 .mode = 0644, 5392 .proc_handler = proc_dointvec, 5393 }, 5394 { 5395 .procname = "max_addresses", 5396 .data = &ipv6_devconf.max_addresses, 5397 .maxlen = sizeof(int), 5398 .mode = 0644, 5399 .proc_handler = proc_dointvec, 5400 }, 5401 { 5402 .procname = "accept_ra_defrtr", 5403 .data = &ipv6_devconf.accept_ra_defrtr, 5404 .maxlen = sizeof(int), 5405 .mode = 0644, 5406 .proc_handler = proc_dointvec, 5407 }, 5408 { 5409 .procname = "accept_ra_pinfo", 5410 .data = &ipv6_devconf.accept_ra_pinfo, 5411 .maxlen = sizeof(int), 5412 .mode = 0644, 5413 .proc_handler = proc_dointvec, 5414 }, 5415 #ifdef CONFIG_IPV6_ROUTER_PREF 5416 { 5417 .procname = "accept_ra_rtr_pref", 5418 .data = &ipv6_devconf.accept_ra_rtr_pref, 5419 .maxlen = sizeof(int), 5420 .mode = 0644, 5421 .proc_handler = proc_dointvec, 5422 }, 5423 { 5424 .procname = "router_probe_interval", 5425 .data = &ipv6_devconf.rtr_probe_interval, 5426 .maxlen = sizeof(int), 5427 .mode = 0644, 5428 .proc_handler = proc_dointvec_jiffies, 5429 }, 5430 #ifdef CONFIG_IPV6_ROUTE_INFO 5431 { 5432 .procname = "accept_ra_rt_info_max_plen", 5433 .data = &ipv6_devconf.accept_ra_rt_info_max_plen, 5434 .maxlen = sizeof(int), 5435 .mode = 0644, 5436 .proc_handler = proc_dointvec, 5437 }, 5438 #endif 5439 #endif 5440 { 5441 .procname = "proxy_ndp", 5442 .data = &ipv6_devconf.proxy_ndp, 5443 .maxlen = sizeof(int), 5444 .mode = 0644, 5445 .proc_handler = addrconf_sysctl_proxy_ndp, 5446 }, 5447 { 5448 .procname = "accept_source_route", 5449 .data = &ipv6_devconf.accept_source_route, 5450 .maxlen = sizeof(int), 5451 .mode = 0644, 5452 .proc_handler = proc_dointvec, 5453 }, 5454 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 5455 { 5456 .procname = "optimistic_dad", 5457 .data = &ipv6_devconf.optimistic_dad, 5458 .maxlen = sizeof(int), 5459 .mode = 0644, 5460 .proc_handler = proc_dointvec, 5461 5462 }, 5463 { 5464 .procname = "use_optimistic", 5465 .data = &ipv6_devconf.use_optimistic, 5466 .maxlen = sizeof(int), 5467 .mode = 0644, 5468 .proc_handler = proc_dointvec, 5469 5470 }, 5471 #endif 5472 #ifdef CONFIG_IPV6_MROUTE 5473 { 5474 .procname = "mc_forwarding", 5475 .data = &ipv6_devconf.mc_forwarding, 5476 .maxlen = sizeof(int), 5477 .mode = 0444, 5478 .proc_handler = proc_dointvec, 5479 }, 5480 #endif 5481 { 5482 .procname = "disable_ipv6", 5483 .data = &ipv6_devconf.disable_ipv6, 5484 .maxlen = sizeof(int), 5485 .mode = 0644, 5486 .proc_handler = addrconf_sysctl_disable, 5487 }, 5488 { 5489 .procname = "accept_dad", 5490 .data = &ipv6_devconf.accept_dad, 5491 .maxlen = sizeof(int), 5492 .mode = 0644, 5493 .proc_handler = proc_dointvec, 5494 }, 5495 { 5496 .procname = "force_tllao", 5497 .data = &ipv6_devconf.force_tllao, 5498 .maxlen = sizeof(int), 5499 .mode = 0644, 5500 .proc_handler = proc_dointvec 5501 }, 5502 { 5503 .procname = "ndisc_notify", 5504 .data = &ipv6_devconf.ndisc_notify, 5505 .maxlen = sizeof(int), 5506 .mode = 0644, 5507 .proc_handler = proc_dointvec 5508 }, 5509 { 5510 .procname = "suppress_frag_ndisc", 5511 .data = &ipv6_devconf.suppress_frag_ndisc, 5512 .maxlen = sizeof(int), 5513 .mode = 0644, 5514 .proc_handler = proc_dointvec 5515 }, 5516 { 5517 .procname = "accept_ra_from_local", 5518 .data = &ipv6_devconf.accept_ra_from_local, 5519 .maxlen = sizeof(int), 5520 .mode = 0644, 5521 .proc_handler = proc_dointvec, 5522 }, 5523 { 5524 .procname = "accept_ra_mtu", 5525 .data = &ipv6_devconf.accept_ra_mtu, 5526 .maxlen = sizeof(int), 5527 .mode = 0644, 5528 .proc_handler = proc_dointvec, 5529 }, 5530 { 5531 .procname = "stable_secret", 5532 .data = &ipv6_devconf.stable_secret, 5533 .maxlen = IPV6_MAX_STRLEN, 5534 .mode = 0600, 5535 .proc_handler = addrconf_sysctl_stable_secret, 5536 }, 5537 { 5538 /* sentinel */ 5539 } 5540 }, 5541 }; 5542 5543 static int __addrconf_sysctl_register(struct net *net, char *dev_name, 5544 struct inet6_dev *idev, struct ipv6_devconf *p) 5545 { 5546 int i; 5547 struct addrconf_sysctl_table *t; 5548 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ]; 5549 5550 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL); 5551 if (t == NULL) 5552 goto out; 5553 5554 for (i = 0; t->addrconf_vars[i].data; i++) { 5555 t->addrconf_vars[i].data += (char *)p - (char *)&ipv6_devconf; 5556 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */ 5557 t->addrconf_vars[i].extra2 = net; 5558 } 5559 5560 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name); 5561 5562 t->sysctl_header = register_net_sysctl(net, path, t->addrconf_vars); 5563 if (t->sysctl_header == NULL) 5564 goto free; 5565 5566 p->sysctl = t; 5567 return 0; 5568 5569 free: 5570 kfree(t); 5571 out: 5572 return -ENOBUFS; 5573 } 5574 5575 static void __addrconf_sysctl_unregister(struct ipv6_devconf *p) 5576 { 5577 struct addrconf_sysctl_table *t; 5578 5579 if (p->sysctl == NULL) 5580 return; 5581 5582 t = p->sysctl; 5583 p->sysctl = NULL; 5584 unregister_net_sysctl_table(t->sysctl_header); 5585 kfree(t); 5586 } 5587 5588 static int addrconf_sysctl_register(struct inet6_dev *idev) 5589 { 5590 int err; 5591 5592 if (!sysctl_dev_name_is_allowed(idev->dev->name)) 5593 return -EINVAL; 5594 5595 err = neigh_sysctl_register(idev->dev, idev->nd_parms, 5596 &ndisc_ifinfo_sysctl_change); 5597 if (err) 5598 return err; 5599 err = __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name, 5600 idev, &idev->cnf); 5601 if (err) 5602 neigh_sysctl_unregister(idev->nd_parms); 5603 5604 return err; 5605 } 5606 5607 static void addrconf_sysctl_unregister(struct inet6_dev *idev) 5608 { 5609 __addrconf_sysctl_unregister(&idev->cnf); 5610 neigh_sysctl_unregister(idev->nd_parms); 5611 } 5612 5613 5614 #endif 5615 5616 static int __net_init addrconf_init_net(struct net *net) 5617 { 5618 int err = -ENOMEM; 5619 struct ipv6_devconf *all, *dflt; 5620 5621 all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL); 5622 if (all == NULL) 5623 goto err_alloc_all; 5624 5625 dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL); 5626 if (dflt == NULL) 5627 goto err_alloc_dflt; 5628 5629 /* these will be inherited by all namespaces */ 5630 dflt->autoconf = ipv6_defaults.autoconf; 5631 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6; 5632 5633 dflt->stable_secret.initialized = false; 5634 all->stable_secret.initialized = false; 5635 5636 net->ipv6.devconf_all = all; 5637 net->ipv6.devconf_dflt = dflt; 5638 5639 #ifdef CONFIG_SYSCTL 5640 err = __addrconf_sysctl_register(net, "all", NULL, all); 5641 if (err < 0) 5642 goto err_reg_all; 5643 5644 err = __addrconf_sysctl_register(net, "default", NULL, dflt); 5645 if (err < 0) 5646 goto err_reg_dflt; 5647 #endif 5648 return 0; 5649 5650 #ifdef CONFIG_SYSCTL 5651 err_reg_dflt: 5652 __addrconf_sysctl_unregister(all); 5653 err_reg_all: 5654 kfree(dflt); 5655 #endif 5656 err_alloc_dflt: 5657 kfree(all); 5658 err_alloc_all: 5659 return err; 5660 } 5661 5662 static void __net_exit addrconf_exit_net(struct net *net) 5663 { 5664 #ifdef CONFIG_SYSCTL 5665 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt); 5666 __addrconf_sysctl_unregister(net->ipv6.devconf_all); 5667 #endif 5668 kfree(net->ipv6.devconf_dflt); 5669 kfree(net->ipv6.devconf_all); 5670 } 5671 5672 static struct pernet_operations addrconf_ops = { 5673 .init = addrconf_init_net, 5674 .exit = addrconf_exit_net, 5675 }; 5676 5677 static struct rtnl_af_ops inet6_ops __read_mostly = { 5678 .family = AF_INET6, 5679 .fill_link_af = inet6_fill_link_af, 5680 .get_link_af_size = inet6_get_link_af_size, 5681 .validate_link_af = inet6_validate_link_af, 5682 .set_link_af = inet6_set_link_af, 5683 }; 5684 5685 /* 5686 * Init / cleanup code 5687 */ 5688 5689 int __init addrconf_init(void) 5690 { 5691 struct inet6_dev *idev; 5692 int i, err; 5693 5694 err = ipv6_addr_label_init(); 5695 if (err < 0) { 5696 pr_crit("%s: cannot initialize default policy table: %d\n", 5697 __func__, err); 5698 goto out; 5699 } 5700 5701 err = register_pernet_subsys(&addrconf_ops); 5702 if (err < 0) 5703 goto out_addrlabel; 5704 5705 addrconf_wq = create_workqueue("ipv6_addrconf"); 5706 if (!addrconf_wq) { 5707 err = -ENOMEM; 5708 goto out_nowq; 5709 } 5710 5711 /* The addrconf netdev notifier requires that loopback_dev 5712 * has it's ipv6 private information allocated and setup 5713 * before it can bring up and give link-local addresses 5714 * to other devices which are up. 5715 * 5716 * Unfortunately, loopback_dev is not necessarily the first 5717 * entry in the global dev_base list of net devices. In fact, 5718 * it is likely to be the very last entry on that list. 5719 * So this causes the notifier registry below to try and 5720 * give link-local addresses to all devices besides loopback_dev 5721 * first, then loopback_dev, which cases all the non-loopback_dev 5722 * devices to fail to get a link-local address. 5723 * 5724 * So, as a temporary fix, allocate the ipv6 structure for 5725 * loopback_dev first by hand. 5726 * Longer term, all of the dependencies ipv6 has upon the loopback 5727 * device and it being up should be removed. 5728 */ 5729 rtnl_lock(); 5730 idev = ipv6_add_dev(init_net.loopback_dev); 5731 rtnl_unlock(); 5732 if (IS_ERR(idev)) { 5733 err = PTR_ERR(idev); 5734 goto errlo; 5735 } 5736 5737 for (i = 0; i < IN6_ADDR_HSIZE; i++) 5738 INIT_HLIST_HEAD(&inet6_addr_lst[i]); 5739 5740 register_netdevice_notifier(&ipv6_dev_notf); 5741 5742 addrconf_verify(); 5743 5744 rtnl_af_register(&inet6_ops); 5745 5746 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo, 5747 NULL); 5748 if (err < 0) 5749 goto errout; 5750 5751 /* Only the first call to __rtnl_register can fail */ 5752 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL, NULL); 5753 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL, NULL); 5754 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr, 5755 inet6_dump_ifaddr, NULL); 5756 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL, 5757 inet6_dump_ifmcaddr, NULL); 5758 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL, 5759 inet6_dump_ifacaddr, NULL); 5760 __rtnl_register(PF_INET6, RTM_GETNETCONF, inet6_netconf_get_devconf, 5761 inet6_netconf_dump_devconf, NULL); 5762 5763 ipv6_addr_label_rtnl_register(); 5764 5765 return 0; 5766 errout: 5767 rtnl_af_unregister(&inet6_ops); 5768 unregister_netdevice_notifier(&ipv6_dev_notf); 5769 errlo: 5770 destroy_workqueue(addrconf_wq); 5771 out_nowq: 5772 unregister_pernet_subsys(&addrconf_ops); 5773 out_addrlabel: 5774 ipv6_addr_label_cleanup(); 5775 out: 5776 return err; 5777 } 5778 5779 void addrconf_cleanup(void) 5780 { 5781 struct net_device *dev; 5782 int i; 5783 5784 unregister_netdevice_notifier(&ipv6_dev_notf); 5785 unregister_pernet_subsys(&addrconf_ops); 5786 ipv6_addr_label_cleanup(); 5787 5788 rtnl_lock(); 5789 5790 __rtnl_af_unregister(&inet6_ops); 5791 5792 /* clean dev list */ 5793 for_each_netdev(&init_net, dev) { 5794 if (__in6_dev_get(dev) == NULL) 5795 continue; 5796 addrconf_ifdown(dev, 1); 5797 } 5798 addrconf_ifdown(init_net.loopback_dev, 2); 5799 5800 /* 5801 * Check hash table. 5802 */ 5803 spin_lock_bh(&addrconf_hash_lock); 5804 for (i = 0; i < IN6_ADDR_HSIZE; i++) 5805 WARN_ON(!hlist_empty(&inet6_addr_lst[i])); 5806 spin_unlock_bh(&addrconf_hash_lock); 5807 cancel_delayed_work(&addr_chk_work); 5808 rtnl_unlock(); 5809 5810 destroy_workqueue(addrconf_wq); 5811 } 5812