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 in6_addr addr; 1714 struct inet6_dev *idev = ifp->idev; 1715 1716 if (addrconf_dad_end(ifp)) { 1717 in6_ifa_put(ifp); 1718 return; 1719 } 1720 1721 net_info_ratelimited("%s: IPv6 duplicate address %pI6c detected!\n", 1722 ifp->idev->dev->name, &ifp->addr); 1723 1724 spin_lock_bh(&ifp->lock); 1725 1726 if (ifp->flags & IFA_F_STABLE_PRIVACY) { 1727 int scope = ifp->scope; 1728 u32 flags = ifp->flags; 1729 struct in6_addr new_addr; 1730 struct inet6_ifaddr *ifp2; 1731 u32 valid_lft, preferred_lft; 1732 int pfxlen = ifp->prefix_len; 1733 const unsigned int idgen_retries = 3; 1734 const unsigned int idgen_delay = 1 * HZ; 1735 int retries = ifp->stable_privacy_retry + 1; 1736 1737 if (retries > idgen_retries) { 1738 net_info_ratelimited("%s: privacy stable address generation failed because of DAD conflicts!\n", 1739 ifp->idev->dev->name); 1740 goto errdad; 1741 } 1742 1743 new_addr = ifp->addr; 1744 if (ipv6_generate_stable_address(&new_addr, retries, 1745 idev)) 1746 goto errdad; 1747 1748 valid_lft = ifp->valid_lft; 1749 preferred_lft = ifp->prefered_lft; 1750 1751 spin_unlock_bh(&ifp->lock); 1752 1753 if (idev->cnf.max_addresses && 1754 ipv6_count_addresses(idev) >= 1755 idev->cnf.max_addresses) 1756 goto lock_errdad; 1757 1758 net_info_ratelimited("%s: generating new stable privacy address because of DAD conflict\n", 1759 ifp->idev->dev->name); 1760 1761 ifp2 = ipv6_add_addr(idev, &new_addr, NULL, pfxlen, 1762 scope, flags, valid_lft, 1763 preferred_lft); 1764 if (IS_ERR(ifp2)) 1765 goto lock_errdad; 1766 1767 spin_lock_bh(&ifp2->lock); 1768 ifp2->stable_privacy_retry = retries; 1769 ifp2->state = INET6_IFADDR_STATE_PREDAD; 1770 spin_unlock_bh(&ifp2->lock); 1771 1772 addrconf_mod_dad_work(ifp2, idgen_delay); 1773 in6_ifa_put(ifp2); 1774 lock_errdad: 1775 spin_lock_bh(&ifp->lock); 1776 } else if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6) { 1777 addr.s6_addr32[0] = htonl(0xfe800000); 1778 addr.s6_addr32[1] = 0; 1779 1780 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) && 1781 ipv6_addr_equal(&ifp->addr, &addr)) { 1782 /* DAD failed for link-local based on MAC address */ 1783 idev->cnf.disable_ipv6 = 1; 1784 1785 pr_info("%s: IPv6 being disabled!\n", 1786 ifp->idev->dev->name); 1787 } 1788 } 1789 1790 errdad: 1791 /* transition from _POSTDAD to _ERRDAD */ 1792 ifp->state = INET6_IFADDR_STATE_ERRDAD; 1793 spin_unlock_bh(&ifp->lock); 1794 1795 addrconf_mod_dad_work(ifp, 0); 1796 } 1797 1798 /* Join to solicited addr multicast group. 1799 * caller must hold RTNL */ 1800 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr) 1801 { 1802 struct in6_addr maddr; 1803 1804 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP)) 1805 return; 1806 1807 addrconf_addr_solict_mult(addr, &maddr); 1808 ipv6_dev_mc_inc(dev, &maddr); 1809 } 1810 1811 /* caller must hold RTNL */ 1812 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr) 1813 { 1814 struct in6_addr maddr; 1815 1816 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP)) 1817 return; 1818 1819 addrconf_addr_solict_mult(addr, &maddr); 1820 __ipv6_dev_mc_dec(idev, &maddr); 1821 } 1822 1823 /* caller must hold RTNL */ 1824 static void addrconf_join_anycast(struct inet6_ifaddr *ifp) 1825 { 1826 struct in6_addr addr; 1827 1828 if (ifp->prefix_len >= 127) /* RFC 6164 */ 1829 return; 1830 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len); 1831 if (ipv6_addr_any(&addr)) 1832 return; 1833 __ipv6_dev_ac_inc(ifp->idev, &addr); 1834 } 1835 1836 /* caller must hold RTNL */ 1837 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp) 1838 { 1839 struct in6_addr addr; 1840 1841 if (ifp->prefix_len >= 127) /* RFC 6164 */ 1842 return; 1843 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len); 1844 if (ipv6_addr_any(&addr)) 1845 return; 1846 __ipv6_dev_ac_dec(ifp->idev, &addr); 1847 } 1848 1849 static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev) 1850 { 1851 if (dev->addr_len != ETH_ALEN) 1852 return -1; 1853 memcpy(eui, dev->dev_addr, 3); 1854 memcpy(eui + 5, dev->dev_addr + 3, 3); 1855 1856 /* 1857 * The zSeries OSA network cards can be shared among various 1858 * OS instances, but the OSA cards have only one MAC address. 1859 * This leads to duplicate address conflicts in conjunction 1860 * with IPv6 if more than one instance uses the same card. 1861 * 1862 * The driver for these cards can deliver a unique 16-bit 1863 * identifier for each instance sharing the same card. It is 1864 * placed instead of 0xFFFE in the interface identifier. The 1865 * "u" bit of the interface identifier is not inverted in this 1866 * case. Hence the resulting interface identifier has local 1867 * scope according to RFC2373. 1868 */ 1869 if (dev->dev_id) { 1870 eui[3] = (dev->dev_id >> 8) & 0xFF; 1871 eui[4] = dev->dev_id & 0xFF; 1872 } else { 1873 eui[3] = 0xFF; 1874 eui[4] = 0xFE; 1875 eui[0] ^= 2; 1876 } 1877 return 0; 1878 } 1879 1880 static int addrconf_ifid_eui64(u8 *eui, struct net_device *dev) 1881 { 1882 if (dev->addr_len != IEEE802154_ADDR_LEN) 1883 return -1; 1884 memcpy(eui, dev->dev_addr, 8); 1885 eui[0] ^= 2; 1886 return 0; 1887 } 1888 1889 static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev) 1890 { 1891 union fwnet_hwaddr *ha; 1892 1893 if (dev->addr_len != FWNET_ALEN) 1894 return -1; 1895 1896 ha = (union fwnet_hwaddr *)dev->dev_addr; 1897 1898 memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id)); 1899 eui[0] ^= 2; 1900 return 0; 1901 } 1902 1903 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev) 1904 { 1905 /* XXX: inherit EUI-64 from other interface -- yoshfuji */ 1906 if (dev->addr_len != ARCNET_ALEN) 1907 return -1; 1908 memset(eui, 0, 7); 1909 eui[7] = *(u8 *)dev->dev_addr; 1910 return 0; 1911 } 1912 1913 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev) 1914 { 1915 if (dev->addr_len != INFINIBAND_ALEN) 1916 return -1; 1917 memcpy(eui, dev->dev_addr + 12, 8); 1918 eui[0] |= 2; 1919 return 0; 1920 } 1921 1922 static int __ipv6_isatap_ifid(u8 *eui, __be32 addr) 1923 { 1924 if (addr == 0) 1925 return -1; 1926 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) || 1927 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) || 1928 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) || 1929 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) || 1930 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) || 1931 ipv4_is_lbcast(addr)) ? 0x00 : 0x02; 1932 eui[1] = 0; 1933 eui[2] = 0x5E; 1934 eui[3] = 0xFE; 1935 memcpy(eui + 4, &addr, 4); 1936 return 0; 1937 } 1938 1939 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev) 1940 { 1941 if (dev->priv_flags & IFF_ISATAP) 1942 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr); 1943 return -1; 1944 } 1945 1946 static int addrconf_ifid_gre(u8 *eui, struct net_device *dev) 1947 { 1948 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr); 1949 } 1950 1951 static int addrconf_ifid_ip6tnl(u8 *eui, struct net_device *dev) 1952 { 1953 memcpy(eui, dev->perm_addr, 3); 1954 memcpy(eui + 5, dev->perm_addr + 3, 3); 1955 eui[3] = 0xFF; 1956 eui[4] = 0xFE; 1957 eui[0] ^= 2; 1958 return 0; 1959 } 1960 1961 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev) 1962 { 1963 switch (dev->type) { 1964 case ARPHRD_ETHER: 1965 case ARPHRD_FDDI: 1966 return addrconf_ifid_eui48(eui, dev); 1967 case ARPHRD_ARCNET: 1968 return addrconf_ifid_arcnet(eui, dev); 1969 case ARPHRD_INFINIBAND: 1970 return addrconf_ifid_infiniband(eui, dev); 1971 case ARPHRD_SIT: 1972 return addrconf_ifid_sit(eui, dev); 1973 case ARPHRD_IPGRE: 1974 return addrconf_ifid_gre(eui, dev); 1975 case ARPHRD_6LOWPAN: 1976 case ARPHRD_IEEE802154: 1977 return addrconf_ifid_eui64(eui, dev); 1978 case ARPHRD_IEEE1394: 1979 return addrconf_ifid_ieee1394(eui, dev); 1980 case ARPHRD_TUNNEL6: 1981 return addrconf_ifid_ip6tnl(eui, dev); 1982 } 1983 return -1; 1984 } 1985 1986 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev) 1987 { 1988 int err = -1; 1989 struct inet6_ifaddr *ifp; 1990 1991 read_lock_bh(&idev->lock); 1992 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) { 1993 if (ifp->scope > IFA_LINK) 1994 break; 1995 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) { 1996 memcpy(eui, ifp->addr.s6_addr+8, 8); 1997 err = 0; 1998 break; 1999 } 2000 } 2001 read_unlock_bh(&idev->lock); 2002 return err; 2003 } 2004 2005 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */ 2006 static void __ipv6_regen_rndid(struct inet6_dev *idev) 2007 { 2008 regen: 2009 get_random_bytes(idev->rndid, sizeof(idev->rndid)); 2010 idev->rndid[0] &= ~0x02; 2011 2012 /* 2013 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>: 2014 * check if generated address is not inappropriate 2015 * 2016 * - Reserved subnet anycast (RFC 2526) 2017 * 11111101 11....11 1xxxxxxx 2018 * - ISATAP (RFC4214) 6.1 2019 * 00-00-5E-FE-xx-xx-xx-xx 2020 * - value 0 2021 * - XXX: already assigned to an address on the device 2022 */ 2023 if (idev->rndid[0] == 0xfd && 2024 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff && 2025 (idev->rndid[7]&0x80)) 2026 goto regen; 2027 if ((idev->rndid[0]|idev->rndid[1]) == 0) { 2028 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe) 2029 goto regen; 2030 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00) 2031 goto regen; 2032 } 2033 } 2034 2035 static void ipv6_regen_rndid(unsigned long data) 2036 { 2037 struct inet6_dev *idev = (struct inet6_dev *) data; 2038 unsigned long expires; 2039 2040 rcu_read_lock_bh(); 2041 write_lock_bh(&idev->lock); 2042 2043 if (idev->dead) 2044 goto out; 2045 2046 __ipv6_regen_rndid(idev); 2047 2048 expires = jiffies + 2049 idev->cnf.temp_prefered_lft * HZ - 2050 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * 2051 NEIGH_VAR(idev->nd_parms, RETRANS_TIME) - 2052 idev->cnf.max_desync_factor * HZ; 2053 if (time_before(expires, jiffies)) { 2054 pr_warn("%s: too short regeneration interval; timer disabled for %s\n", 2055 __func__, idev->dev->name); 2056 goto out; 2057 } 2058 2059 if (!mod_timer(&idev->regen_timer, expires)) 2060 in6_dev_hold(idev); 2061 2062 out: 2063 write_unlock_bh(&idev->lock); 2064 rcu_read_unlock_bh(); 2065 in6_dev_put(idev); 2066 } 2067 2068 static void __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) 2069 { 2070 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0) 2071 __ipv6_regen_rndid(idev); 2072 } 2073 2074 /* 2075 * Add prefix route. 2076 */ 2077 2078 static void 2079 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev, 2080 unsigned long expires, u32 flags) 2081 { 2082 struct fib6_config cfg = { 2083 .fc_table = RT6_TABLE_PREFIX, 2084 .fc_metric = IP6_RT_PRIO_ADDRCONF, 2085 .fc_ifindex = dev->ifindex, 2086 .fc_expires = expires, 2087 .fc_dst_len = plen, 2088 .fc_flags = RTF_UP | flags, 2089 .fc_nlinfo.nl_net = dev_net(dev), 2090 .fc_protocol = RTPROT_KERNEL, 2091 }; 2092 2093 cfg.fc_dst = *pfx; 2094 2095 /* Prevent useless cloning on PtP SIT. 2096 This thing is done here expecting that the whole 2097 class of non-broadcast devices need not cloning. 2098 */ 2099 #if IS_ENABLED(CONFIG_IPV6_SIT) 2100 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT)) 2101 cfg.fc_flags |= RTF_NONEXTHOP; 2102 #endif 2103 2104 ip6_route_add(&cfg); 2105 } 2106 2107 2108 static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx, 2109 int plen, 2110 const struct net_device *dev, 2111 u32 flags, u32 noflags) 2112 { 2113 struct fib6_node *fn; 2114 struct rt6_info *rt = NULL; 2115 struct fib6_table *table; 2116 2117 table = fib6_get_table(dev_net(dev), RT6_TABLE_PREFIX); 2118 if (table == NULL) 2119 return NULL; 2120 2121 read_lock_bh(&table->tb6_lock); 2122 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0); 2123 if (!fn) 2124 goto out; 2125 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) { 2126 if (rt->dst.dev->ifindex != dev->ifindex) 2127 continue; 2128 if ((rt->rt6i_flags & flags) != flags) 2129 continue; 2130 if ((rt->rt6i_flags & noflags) != 0) 2131 continue; 2132 dst_hold(&rt->dst); 2133 break; 2134 } 2135 out: 2136 read_unlock_bh(&table->tb6_lock); 2137 return rt; 2138 } 2139 2140 2141 /* Create "default" multicast route to the interface */ 2142 2143 static void addrconf_add_mroute(struct net_device *dev) 2144 { 2145 struct fib6_config cfg = { 2146 .fc_table = RT6_TABLE_LOCAL, 2147 .fc_metric = IP6_RT_PRIO_ADDRCONF, 2148 .fc_ifindex = dev->ifindex, 2149 .fc_dst_len = 8, 2150 .fc_flags = RTF_UP, 2151 .fc_nlinfo.nl_net = dev_net(dev), 2152 }; 2153 2154 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0); 2155 2156 ip6_route_add(&cfg); 2157 } 2158 2159 static struct inet6_dev *addrconf_add_dev(struct net_device *dev) 2160 { 2161 struct inet6_dev *idev; 2162 2163 ASSERT_RTNL(); 2164 2165 idev = ipv6_find_idev(dev); 2166 if (!idev) 2167 return ERR_PTR(-ENOBUFS); 2168 2169 if (idev->cnf.disable_ipv6) 2170 return ERR_PTR(-EACCES); 2171 2172 /* Add default multicast route */ 2173 if (!(dev->flags & IFF_LOOPBACK)) 2174 addrconf_add_mroute(dev); 2175 2176 return idev; 2177 } 2178 2179 static void manage_tempaddrs(struct inet6_dev *idev, 2180 struct inet6_ifaddr *ifp, 2181 __u32 valid_lft, __u32 prefered_lft, 2182 bool create, unsigned long now) 2183 { 2184 u32 flags; 2185 struct inet6_ifaddr *ift; 2186 2187 read_lock_bh(&idev->lock); 2188 /* update all temporary addresses in the list */ 2189 list_for_each_entry(ift, &idev->tempaddr_list, tmp_list) { 2190 int age, max_valid, max_prefered; 2191 2192 if (ifp != ift->ifpub) 2193 continue; 2194 2195 /* RFC 4941 section 3.3: 2196 * If a received option will extend the lifetime of a public 2197 * address, the lifetimes of temporary addresses should 2198 * be extended, subject to the overall constraint that no 2199 * temporary addresses should ever remain "valid" or "preferred" 2200 * for a time longer than (TEMP_VALID_LIFETIME) or 2201 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), respectively. 2202 */ 2203 age = (now - ift->cstamp) / HZ; 2204 max_valid = idev->cnf.temp_valid_lft - age; 2205 if (max_valid < 0) 2206 max_valid = 0; 2207 2208 max_prefered = idev->cnf.temp_prefered_lft - 2209 idev->cnf.max_desync_factor - age; 2210 if (max_prefered < 0) 2211 max_prefered = 0; 2212 2213 if (valid_lft > max_valid) 2214 valid_lft = max_valid; 2215 2216 if (prefered_lft > max_prefered) 2217 prefered_lft = max_prefered; 2218 2219 spin_lock(&ift->lock); 2220 flags = ift->flags; 2221 ift->valid_lft = valid_lft; 2222 ift->prefered_lft = prefered_lft; 2223 ift->tstamp = now; 2224 if (prefered_lft > 0) 2225 ift->flags &= ~IFA_F_DEPRECATED; 2226 2227 spin_unlock(&ift->lock); 2228 if (!(flags&IFA_F_TENTATIVE)) 2229 ipv6_ifa_notify(0, ift); 2230 } 2231 2232 if ((create || list_empty(&idev->tempaddr_list)) && 2233 idev->cnf.use_tempaddr > 0) { 2234 /* When a new public address is created as described 2235 * in [ADDRCONF], also create a new temporary address. 2236 * Also create a temporary address if it's enabled but 2237 * no temporary address currently exists. 2238 */ 2239 read_unlock_bh(&idev->lock); 2240 ipv6_create_tempaddr(ifp, NULL); 2241 } else { 2242 read_unlock_bh(&idev->lock); 2243 } 2244 } 2245 2246 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao) 2247 { 2248 struct prefix_info *pinfo; 2249 __u32 valid_lft; 2250 __u32 prefered_lft; 2251 int addr_type; 2252 u32 addr_flags = 0; 2253 struct inet6_dev *in6_dev; 2254 struct net *net = dev_net(dev); 2255 2256 pinfo = (struct prefix_info *) opt; 2257 2258 if (len < sizeof(struct prefix_info)) { 2259 ADBG("addrconf: prefix option too short\n"); 2260 return; 2261 } 2262 2263 /* 2264 * Validation checks ([ADDRCONF], page 19) 2265 */ 2266 2267 addr_type = ipv6_addr_type(&pinfo->prefix); 2268 2269 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL)) 2270 return; 2271 2272 valid_lft = ntohl(pinfo->valid); 2273 prefered_lft = ntohl(pinfo->prefered); 2274 2275 if (prefered_lft > valid_lft) { 2276 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n"); 2277 return; 2278 } 2279 2280 in6_dev = in6_dev_get(dev); 2281 2282 if (in6_dev == NULL) { 2283 net_dbg_ratelimited("addrconf: device %s not configured\n", 2284 dev->name); 2285 return; 2286 } 2287 2288 /* 2289 * Two things going on here: 2290 * 1) Add routes for on-link prefixes 2291 * 2) Configure prefixes with the auto flag set 2292 */ 2293 2294 if (pinfo->onlink) { 2295 struct rt6_info *rt; 2296 unsigned long rt_expires; 2297 2298 /* Avoid arithmetic overflow. Really, we could 2299 * save rt_expires in seconds, likely valid_lft, 2300 * but it would require division in fib gc, that it 2301 * not good. 2302 */ 2303 if (HZ > USER_HZ) 2304 rt_expires = addrconf_timeout_fixup(valid_lft, HZ); 2305 else 2306 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ); 2307 2308 if (addrconf_finite_timeout(rt_expires)) 2309 rt_expires *= HZ; 2310 2311 rt = addrconf_get_prefix_route(&pinfo->prefix, 2312 pinfo->prefix_len, 2313 dev, 2314 RTF_ADDRCONF | RTF_PREFIX_RT, 2315 RTF_GATEWAY | RTF_DEFAULT); 2316 2317 if (rt) { 2318 /* Autoconf prefix route */ 2319 if (valid_lft == 0) { 2320 ip6_del_rt(rt); 2321 rt = NULL; 2322 } else if (addrconf_finite_timeout(rt_expires)) { 2323 /* not infinity */ 2324 rt6_set_expires(rt, jiffies + rt_expires); 2325 } else { 2326 rt6_clean_expires(rt); 2327 } 2328 } else if (valid_lft) { 2329 clock_t expires = 0; 2330 int flags = RTF_ADDRCONF | RTF_PREFIX_RT; 2331 if (addrconf_finite_timeout(rt_expires)) { 2332 /* not infinity */ 2333 flags |= RTF_EXPIRES; 2334 expires = jiffies_to_clock_t(rt_expires); 2335 } 2336 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len, 2337 dev, expires, flags); 2338 } 2339 ip6_rt_put(rt); 2340 } 2341 2342 /* Try to figure out our local address for this prefix */ 2343 2344 if (pinfo->autoconf && in6_dev->cnf.autoconf) { 2345 struct inet6_ifaddr *ifp; 2346 struct in6_addr addr; 2347 int create = 0, update_lft = 0; 2348 bool tokenized = false; 2349 2350 if (pinfo->prefix_len == 64) { 2351 memcpy(&addr, &pinfo->prefix, 8); 2352 2353 if (!ipv6_addr_any(&in6_dev->token)) { 2354 read_lock_bh(&in6_dev->lock); 2355 memcpy(addr.s6_addr + 8, 2356 in6_dev->token.s6_addr + 8, 8); 2357 read_unlock_bh(&in6_dev->lock); 2358 tokenized = true; 2359 } else if (in6_dev->addr_gen_mode == 2360 IN6_ADDR_GEN_MODE_STABLE_PRIVACY && 2361 !ipv6_generate_stable_address(&addr, 0, 2362 in6_dev)) { 2363 addr_flags |= IFA_F_STABLE_PRIVACY; 2364 goto ok; 2365 } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) && 2366 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) { 2367 in6_dev_put(in6_dev); 2368 return; 2369 } 2370 goto ok; 2371 } 2372 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n", 2373 pinfo->prefix_len); 2374 in6_dev_put(in6_dev); 2375 return; 2376 2377 ok: 2378 2379 ifp = ipv6_get_ifaddr(net, &addr, dev, 1); 2380 2381 if (ifp == NULL && valid_lft) { 2382 int max_addresses = in6_dev->cnf.max_addresses; 2383 2384 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 2385 if (in6_dev->cnf.optimistic_dad && 2386 !net->ipv6.devconf_all->forwarding && sllao) 2387 addr_flags = IFA_F_OPTIMISTIC; 2388 #endif 2389 2390 /* Do not allow to create too much of autoconfigured 2391 * addresses; this would be too easy way to crash kernel. 2392 */ 2393 if (!max_addresses || 2394 ipv6_count_addresses(in6_dev) < max_addresses) 2395 ifp = ipv6_add_addr(in6_dev, &addr, NULL, 2396 pinfo->prefix_len, 2397 addr_type&IPV6_ADDR_SCOPE_MASK, 2398 addr_flags, valid_lft, 2399 prefered_lft); 2400 2401 if (IS_ERR_OR_NULL(ifp)) { 2402 in6_dev_put(in6_dev); 2403 return; 2404 } 2405 2406 update_lft = 0; 2407 create = 1; 2408 spin_lock_bh(&ifp->lock); 2409 ifp->flags |= IFA_F_MANAGETEMPADDR; 2410 ifp->cstamp = jiffies; 2411 ifp->tokenized = tokenized; 2412 spin_unlock_bh(&ifp->lock); 2413 addrconf_dad_start(ifp); 2414 } 2415 2416 if (ifp) { 2417 u32 flags; 2418 unsigned long now; 2419 u32 stored_lft; 2420 2421 /* update lifetime (RFC2462 5.5.3 e) */ 2422 spin_lock_bh(&ifp->lock); 2423 now = jiffies; 2424 if (ifp->valid_lft > (now - ifp->tstamp) / HZ) 2425 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ; 2426 else 2427 stored_lft = 0; 2428 if (!update_lft && !create && stored_lft) { 2429 const u32 minimum_lft = min_t(u32, 2430 stored_lft, MIN_VALID_LIFETIME); 2431 valid_lft = max(valid_lft, minimum_lft); 2432 2433 /* RFC4862 Section 5.5.3e: 2434 * "Note that the preferred lifetime of the 2435 * corresponding address is always reset to 2436 * the Preferred Lifetime in the received 2437 * Prefix Information option, regardless of 2438 * whether the valid lifetime is also reset or 2439 * ignored." 2440 * 2441 * So we should always update prefered_lft here. 2442 */ 2443 update_lft = 1; 2444 } 2445 2446 if (update_lft) { 2447 ifp->valid_lft = valid_lft; 2448 ifp->prefered_lft = prefered_lft; 2449 ifp->tstamp = now; 2450 flags = ifp->flags; 2451 ifp->flags &= ~IFA_F_DEPRECATED; 2452 spin_unlock_bh(&ifp->lock); 2453 2454 if (!(flags&IFA_F_TENTATIVE)) 2455 ipv6_ifa_notify(0, ifp); 2456 } else 2457 spin_unlock_bh(&ifp->lock); 2458 2459 manage_tempaddrs(in6_dev, ifp, valid_lft, prefered_lft, 2460 create, now); 2461 2462 in6_ifa_put(ifp); 2463 addrconf_verify(); 2464 } 2465 } 2466 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo); 2467 in6_dev_put(in6_dev); 2468 } 2469 2470 /* 2471 * Set destination address. 2472 * Special case for SIT interfaces where we create a new "virtual" 2473 * device. 2474 */ 2475 int addrconf_set_dstaddr(struct net *net, void __user *arg) 2476 { 2477 struct in6_ifreq ireq; 2478 struct net_device *dev; 2479 int err = -EINVAL; 2480 2481 rtnl_lock(); 2482 2483 err = -EFAULT; 2484 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2485 goto err_exit; 2486 2487 dev = __dev_get_by_index(net, ireq.ifr6_ifindex); 2488 2489 err = -ENODEV; 2490 if (dev == NULL) 2491 goto err_exit; 2492 2493 #if IS_ENABLED(CONFIG_IPV6_SIT) 2494 if (dev->type == ARPHRD_SIT) { 2495 const struct net_device_ops *ops = dev->netdev_ops; 2496 struct ifreq ifr; 2497 struct ip_tunnel_parm p; 2498 2499 err = -EADDRNOTAVAIL; 2500 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4)) 2501 goto err_exit; 2502 2503 memset(&p, 0, sizeof(p)); 2504 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3]; 2505 p.iph.saddr = 0; 2506 p.iph.version = 4; 2507 p.iph.ihl = 5; 2508 p.iph.protocol = IPPROTO_IPV6; 2509 p.iph.ttl = 64; 2510 ifr.ifr_ifru.ifru_data = (__force void __user *)&p; 2511 2512 if (ops->ndo_do_ioctl) { 2513 mm_segment_t oldfs = get_fs(); 2514 2515 set_fs(KERNEL_DS); 2516 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL); 2517 set_fs(oldfs); 2518 } else 2519 err = -EOPNOTSUPP; 2520 2521 if (err == 0) { 2522 err = -ENOBUFS; 2523 dev = __dev_get_by_name(net, p.name); 2524 if (!dev) 2525 goto err_exit; 2526 err = dev_open(dev); 2527 } 2528 } 2529 #endif 2530 2531 err_exit: 2532 rtnl_unlock(); 2533 return err; 2534 } 2535 2536 static int ipv6_mc_config(struct sock *sk, bool join, 2537 const struct in6_addr *addr, int ifindex) 2538 { 2539 int ret; 2540 2541 ASSERT_RTNL(); 2542 2543 lock_sock(sk); 2544 if (join) 2545 ret = ipv6_sock_mc_join(sk, ifindex, addr); 2546 else 2547 ret = ipv6_sock_mc_drop(sk, ifindex, addr); 2548 release_sock(sk); 2549 2550 return ret; 2551 } 2552 2553 /* 2554 * Manual configuration of address on an interface 2555 */ 2556 static int inet6_addr_add(struct net *net, int ifindex, 2557 const struct in6_addr *pfx, 2558 const struct in6_addr *peer_pfx, 2559 unsigned int plen, __u32 ifa_flags, 2560 __u32 prefered_lft, __u32 valid_lft) 2561 { 2562 struct inet6_ifaddr *ifp; 2563 struct inet6_dev *idev; 2564 struct net_device *dev; 2565 unsigned long timeout; 2566 clock_t expires; 2567 int scope; 2568 u32 flags; 2569 2570 ASSERT_RTNL(); 2571 2572 if (plen > 128) 2573 return -EINVAL; 2574 2575 /* check the lifetime */ 2576 if (!valid_lft || prefered_lft > valid_lft) 2577 return -EINVAL; 2578 2579 if (ifa_flags & IFA_F_MANAGETEMPADDR && plen != 64) 2580 return -EINVAL; 2581 2582 dev = __dev_get_by_index(net, ifindex); 2583 if (!dev) 2584 return -ENODEV; 2585 2586 idev = addrconf_add_dev(dev); 2587 if (IS_ERR(idev)) 2588 return PTR_ERR(idev); 2589 2590 if (ifa_flags & IFA_F_MCAUTOJOIN) { 2591 int ret = ipv6_mc_config(net->ipv6.mc_autojoin_sk, 2592 true, pfx, ifindex); 2593 2594 if (ret < 0) 2595 return ret; 2596 } 2597 2598 scope = ipv6_addr_scope(pfx); 2599 2600 timeout = addrconf_timeout_fixup(valid_lft, HZ); 2601 if (addrconf_finite_timeout(timeout)) { 2602 expires = jiffies_to_clock_t(timeout * HZ); 2603 valid_lft = timeout; 2604 flags = RTF_EXPIRES; 2605 } else { 2606 expires = 0; 2607 flags = 0; 2608 ifa_flags |= IFA_F_PERMANENT; 2609 } 2610 2611 timeout = addrconf_timeout_fixup(prefered_lft, HZ); 2612 if (addrconf_finite_timeout(timeout)) { 2613 if (timeout == 0) 2614 ifa_flags |= IFA_F_DEPRECATED; 2615 prefered_lft = timeout; 2616 } 2617 2618 ifp = ipv6_add_addr(idev, pfx, peer_pfx, plen, scope, ifa_flags, 2619 valid_lft, prefered_lft); 2620 2621 if (!IS_ERR(ifp)) { 2622 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) { 2623 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev, 2624 expires, flags); 2625 } 2626 2627 /* 2628 * Note that section 3.1 of RFC 4429 indicates 2629 * that the Optimistic flag should not be set for 2630 * manually configured addresses 2631 */ 2632 addrconf_dad_start(ifp); 2633 if (ifa_flags & IFA_F_MANAGETEMPADDR) 2634 manage_tempaddrs(idev, ifp, valid_lft, prefered_lft, 2635 true, jiffies); 2636 in6_ifa_put(ifp); 2637 addrconf_verify_rtnl(); 2638 return 0; 2639 } else if (ifa_flags & IFA_F_MCAUTOJOIN) { 2640 ipv6_mc_config(net->ipv6.mc_autojoin_sk, 2641 false, pfx, ifindex); 2642 } 2643 2644 return PTR_ERR(ifp); 2645 } 2646 2647 static int inet6_addr_del(struct net *net, int ifindex, u32 ifa_flags, 2648 const struct in6_addr *pfx, unsigned int plen) 2649 { 2650 struct inet6_ifaddr *ifp; 2651 struct inet6_dev *idev; 2652 struct net_device *dev; 2653 2654 if (plen > 128) 2655 return -EINVAL; 2656 2657 dev = __dev_get_by_index(net, ifindex); 2658 if (!dev) 2659 return -ENODEV; 2660 2661 idev = __in6_dev_get(dev); 2662 if (idev == NULL) 2663 return -ENXIO; 2664 2665 read_lock_bh(&idev->lock); 2666 list_for_each_entry(ifp, &idev->addr_list, if_list) { 2667 if (ifp->prefix_len == plen && 2668 ipv6_addr_equal(pfx, &ifp->addr)) { 2669 in6_ifa_hold(ifp); 2670 read_unlock_bh(&idev->lock); 2671 2672 if (!(ifp->flags & IFA_F_TEMPORARY) && 2673 (ifa_flags & IFA_F_MANAGETEMPADDR)) 2674 manage_tempaddrs(idev, ifp, 0, 0, false, 2675 jiffies); 2676 ipv6_del_addr(ifp); 2677 addrconf_verify_rtnl(); 2678 if (ipv6_addr_is_multicast(pfx)) { 2679 ipv6_mc_config(net->ipv6.mc_autojoin_sk, 2680 false, pfx, dev->ifindex); 2681 } 2682 return 0; 2683 } 2684 } 2685 read_unlock_bh(&idev->lock); 2686 return -EADDRNOTAVAIL; 2687 } 2688 2689 2690 int addrconf_add_ifaddr(struct net *net, void __user *arg) 2691 { 2692 struct in6_ifreq ireq; 2693 int err; 2694 2695 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 2696 return -EPERM; 2697 2698 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2699 return -EFAULT; 2700 2701 rtnl_lock(); 2702 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, NULL, 2703 ireq.ifr6_prefixlen, IFA_F_PERMANENT, 2704 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME); 2705 rtnl_unlock(); 2706 return err; 2707 } 2708 2709 int addrconf_del_ifaddr(struct net *net, void __user *arg) 2710 { 2711 struct in6_ifreq ireq; 2712 int err; 2713 2714 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 2715 return -EPERM; 2716 2717 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2718 return -EFAULT; 2719 2720 rtnl_lock(); 2721 err = inet6_addr_del(net, ireq.ifr6_ifindex, 0, &ireq.ifr6_addr, 2722 ireq.ifr6_prefixlen); 2723 rtnl_unlock(); 2724 return err; 2725 } 2726 2727 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr, 2728 int plen, int scope) 2729 { 2730 struct inet6_ifaddr *ifp; 2731 2732 ifp = ipv6_add_addr(idev, addr, NULL, plen, 2733 scope, IFA_F_PERMANENT, 2734 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME); 2735 if (!IS_ERR(ifp)) { 2736 spin_lock_bh(&ifp->lock); 2737 ifp->flags &= ~IFA_F_TENTATIVE; 2738 spin_unlock_bh(&ifp->lock); 2739 ipv6_ifa_notify(RTM_NEWADDR, ifp); 2740 in6_ifa_put(ifp); 2741 } 2742 } 2743 2744 #if IS_ENABLED(CONFIG_IPV6_SIT) 2745 static void sit_add_v4_addrs(struct inet6_dev *idev) 2746 { 2747 struct in6_addr addr; 2748 struct net_device *dev; 2749 struct net *net = dev_net(idev->dev); 2750 int scope, plen; 2751 u32 pflags = 0; 2752 2753 ASSERT_RTNL(); 2754 2755 memset(&addr, 0, sizeof(struct in6_addr)); 2756 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4); 2757 2758 if (idev->dev->flags&IFF_POINTOPOINT) { 2759 addr.s6_addr32[0] = htonl(0xfe800000); 2760 scope = IFA_LINK; 2761 plen = 64; 2762 } else { 2763 scope = IPV6_ADDR_COMPATv4; 2764 plen = 96; 2765 pflags |= RTF_NONEXTHOP; 2766 } 2767 2768 if (addr.s6_addr32[3]) { 2769 add_addr(idev, &addr, plen, scope); 2770 addrconf_prefix_route(&addr, plen, idev->dev, 0, pflags); 2771 return; 2772 } 2773 2774 for_each_netdev(net, dev) { 2775 struct in_device *in_dev = __in_dev_get_rtnl(dev); 2776 if (in_dev && (dev->flags & IFF_UP)) { 2777 struct in_ifaddr *ifa; 2778 2779 int flag = scope; 2780 2781 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) { 2782 2783 addr.s6_addr32[3] = ifa->ifa_local; 2784 2785 if (ifa->ifa_scope == RT_SCOPE_LINK) 2786 continue; 2787 if (ifa->ifa_scope >= RT_SCOPE_HOST) { 2788 if (idev->dev->flags&IFF_POINTOPOINT) 2789 continue; 2790 flag |= IFA_HOST; 2791 } 2792 2793 add_addr(idev, &addr, plen, flag); 2794 addrconf_prefix_route(&addr, plen, idev->dev, 0, 2795 pflags); 2796 } 2797 } 2798 } 2799 } 2800 #endif 2801 2802 static void init_loopback(struct net_device *dev) 2803 { 2804 struct inet6_dev *idev; 2805 struct net_device *sp_dev; 2806 struct inet6_ifaddr *sp_ifa; 2807 struct rt6_info *sp_rt; 2808 2809 /* ::1 */ 2810 2811 ASSERT_RTNL(); 2812 2813 idev = ipv6_find_idev(dev); 2814 if (idev == NULL) { 2815 pr_debug("%s: add_dev failed\n", __func__); 2816 return; 2817 } 2818 2819 add_addr(idev, &in6addr_loopback, 128, IFA_HOST); 2820 2821 /* Add routes to other interface's IPv6 addresses */ 2822 for_each_netdev(dev_net(dev), sp_dev) { 2823 if (!strcmp(sp_dev->name, dev->name)) 2824 continue; 2825 2826 idev = __in6_dev_get(sp_dev); 2827 if (!idev) 2828 continue; 2829 2830 read_lock_bh(&idev->lock); 2831 list_for_each_entry(sp_ifa, &idev->addr_list, if_list) { 2832 2833 if (sp_ifa->flags & (IFA_F_DADFAILED | IFA_F_TENTATIVE)) 2834 continue; 2835 2836 if (sp_ifa->rt) { 2837 /* This dst has been added to garbage list when 2838 * lo device down, release this obsolete dst and 2839 * reallocate a new router for ifa. 2840 */ 2841 if (sp_ifa->rt->dst.obsolete > 0) { 2842 ip6_rt_put(sp_ifa->rt); 2843 sp_ifa->rt = NULL; 2844 } else { 2845 continue; 2846 } 2847 } 2848 2849 sp_rt = addrconf_dst_alloc(idev, &sp_ifa->addr, false); 2850 2851 /* Failure cases are ignored */ 2852 if (!IS_ERR(sp_rt)) { 2853 sp_ifa->rt = sp_rt; 2854 ip6_ins_rt(sp_rt); 2855 } 2856 } 2857 read_unlock_bh(&idev->lock); 2858 } 2859 } 2860 2861 static void addrconf_add_linklocal(struct inet6_dev *idev, 2862 const struct in6_addr *addr, u32 flags) 2863 { 2864 struct inet6_ifaddr *ifp; 2865 u32 addr_flags = flags | IFA_F_PERMANENT; 2866 2867 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 2868 if (idev->cnf.optimistic_dad && 2869 !dev_net(idev->dev)->ipv6.devconf_all->forwarding) 2870 addr_flags |= IFA_F_OPTIMISTIC; 2871 #endif 2872 2873 ifp = ipv6_add_addr(idev, addr, NULL, 64, IFA_LINK, addr_flags, 2874 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME); 2875 if (!IS_ERR(ifp)) { 2876 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0); 2877 addrconf_dad_start(ifp); 2878 in6_ifa_put(ifp); 2879 } 2880 } 2881 2882 static bool ipv6_reserved_interfaceid(struct in6_addr address) 2883 { 2884 if ((address.s6_addr32[2] | address.s6_addr32[3]) == 0) 2885 return true; 2886 2887 if (address.s6_addr32[2] == htonl(0x02005eff) && 2888 ((address.s6_addr32[3] & htonl(0xfe000000)) == htonl(0xfe000000))) 2889 return true; 2890 2891 if (address.s6_addr32[2] == htonl(0xfdffffff) && 2892 ((address.s6_addr32[3] & htonl(0xffffff80)) == htonl(0xffffff80))) 2893 return true; 2894 2895 return false; 2896 } 2897 2898 static int ipv6_generate_stable_address(struct in6_addr *address, 2899 u8 dad_count, 2900 const struct inet6_dev *idev) 2901 { 2902 static const int idgen_retries = 3; 2903 2904 static DEFINE_SPINLOCK(lock); 2905 static __u32 digest[SHA_DIGEST_WORDS]; 2906 static __u32 workspace[SHA_WORKSPACE_WORDS]; 2907 2908 static union { 2909 char __data[SHA_MESSAGE_BYTES]; 2910 struct { 2911 struct in6_addr secret; 2912 __be64 prefix; 2913 unsigned char hwaddr[MAX_ADDR_LEN]; 2914 u8 dad_count; 2915 } __packed; 2916 } data; 2917 2918 struct in6_addr secret; 2919 struct in6_addr temp; 2920 struct net *net = dev_net(idev->dev); 2921 2922 BUILD_BUG_ON(sizeof(data.__data) != sizeof(data)); 2923 2924 if (idev->cnf.stable_secret.initialized) 2925 secret = idev->cnf.stable_secret.secret; 2926 else if (net->ipv6.devconf_dflt->stable_secret.initialized) 2927 secret = net->ipv6.devconf_dflt->stable_secret.secret; 2928 else 2929 return -1; 2930 2931 retry: 2932 spin_lock_bh(&lock); 2933 2934 sha_init(digest); 2935 memset(&data, 0, sizeof(data)); 2936 memset(workspace, 0, sizeof(workspace)); 2937 memcpy(data.hwaddr, idev->dev->perm_addr, idev->dev->addr_len); 2938 data.prefix = ((__be64)address->s6_addr32[0] << 32) | 2939 (__be64)address->s6_addr32[1]; 2940 data.secret = secret; 2941 data.dad_count = dad_count; 2942 2943 sha_transform(digest, data.__data, workspace); 2944 2945 temp = *address; 2946 temp.s6_addr32[2] = digest[0]; 2947 temp.s6_addr32[3] = digest[1]; 2948 2949 spin_unlock_bh(&lock); 2950 2951 if (ipv6_reserved_interfaceid(temp)) { 2952 dad_count++; 2953 if (dad_count > idgen_retries) 2954 return -1; 2955 goto retry; 2956 } 2957 2958 *address = temp; 2959 return 0; 2960 } 2961 2962 static void addrconf_addr_gen(struct inet6_dev *idev, bool prefix_route) 2963 { 2964 struct in6_addr addr; 2965 2966 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0); 2967 2968 if (idev->addr_gen_mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY) { 2969 if (!ipv6_generate_stable_address(&addr, 0, idev)) 2970 addrconf_add_linklocal(idev, &addr, 2971 IFA_F_STABLE_PRIVACY); 2972 else if (prefix_route) 2973 addrconf_prefix_route(&addr, 64, idev->dev, 0, 0); 2974 } else if (idev->addr_gen_mode == IN6_ADDR_GEN_MODE_EUI64) { 2975 /* addrconf_add_linklocal also adds a prefix_route and we 2976 * only need to care about prefix routes if ipv6_generate_eui64 2977 * couldn't generate one. 2978 */ 2979 if (ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) == 0) 2980 addrconf_add_linklocal(idev, &addr, 0); 2981 else if (prefix_route) 2982 addrconf_prefix_route(&addr, 64, idev->dev, 0, 0); 2983 } 2984 } 2985 2986 static void addrconf_dev_config(struct net_device *dev) 2987 { 2988 struct inet6_dev *idev; 2989 2990 ASSERT_RTNL(); 2991 2992 if ((dev->type != ARPHRD_ETHER) && 2993 (dev->type != ARPHRD_FDDI) && 2994 (dev->type != ARPHRD_ARCNET) && 2995 (dev->type != ARPHRD_INFINIBAND) && 2996 (dev->type != ARPHRD_IEEE802154) && 2997 (dev->type != ARPHRD_IEEE1394) && 2998 (dev->type != ARPHRD_TUNNEL6) && 2999 (dev->type != ARPHRD_6LOWPAN)) { 3000 /* Alas, we support only Ethernet autoconfiguration. */ 3001 return; 3002 } 3003 3004 idev = addrconf_add_dev(dev); 3005 if (IS_ERR(idev)) 3006 return; 3007 3008 addrconf_addr_gen(idev, false); 3009 } 3010 3011 #if IS_ENABLED(CONFIG_IPV6_SIT) 3012 static void addrconf_sit_config(struct net_device *dev) 3013 { 3014 struct inet6_dev *idev; 3015 3016 ASSERT_RTNL(); 3017 3018 /* 3019 * Configure the tunnel with one of our IPv4 3020 * addresses... we should configure all of 3021 * our v4 addrs in the tunnel 3022 */ 3023 3024 idev = ipv6_find_idev(dev); 3025 if (idev == NULL) { 3026 pr_debug("%s: add_dev failed\n", __func__); 3027 return; 3028 } 3029 3030 if (dev->priv_flags & IFF_ISATAP) { 3031 addrconf_addr_gen(idev, false); 3032 return; 3033 } 3034 3035 sit_add_v4_addrs(idev); 3036 3037 if (dev->flags&IFF_POINTOPOINT) 3038 addrconf_add_mroute(dev); 3039 } 3040 #endif 3041 3042 #if IS_ENABLED(CONFIG_NET_IPGRE) 3043 static void addrconf_gre_config(struct net_device *dev) 3044 { 3045 struct inet6_dev *idev; 3046 3047 ASSERT_RTNL(); 3048 3049 idev = ipv6_find_idev(dev); 3050 if (idev == NULL) { 3051 pr_debug("%s: add_dev failed\n", __func__); 3052 return; 3053 } 3054 3055 addrconf_addr_gen(idev, true); 3056 } 3057 #endif 3058 3059 static int addrconf_notify(struct notifier_block *this, unsigned long event, 3060 void *ptr) 3061 { 3062 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 3063 struct inet6_dev *idev = __in6_dev_get(dev); 3064 int run_pending = 0; 3065 int err; 3066 3067 switch (event) { 3068 case NETDEV_REGISTER: 3069 if (!idev && dev->mtu >= IPV6_MIN_MTU) { 3070 idev = ipv6_add_dev(dev); 3071 if (IS_ERR(idev)) 3072 return notifier_from_errno(PTR_ERR(idev)); 3073 } 3074 break; 3075 3076 case NETDEV_UP: 3077 case NETDEV_CHANGE: 3078 if (dev->flags & IFF_SLAVE) 3079 break; 3080 3081 if (idev && idev->cnf.disable_ipv6) 3082 break; 3083 3084 if (event == NETDEV_UP) { 3085 if (!addrconf_qdisc_ok(dev)) { 3086 /* device is not ready yet. */ 3087 pr_info("ADDRCONF(NETDEV_UP): %s: link is not ready\n", 3088 dev->name); 3089 break; 3090 } 3091 3092 if (!idev && dev->mtu >= IPV6_MIN_MTU) 3093 idev = ipv6_add_dev(dev); 3094 3095 if (!IS_ERR_OR_NULL(idev)) { 3096 idev->if_flags |= IF_READY; 3097 run_pending = 1; 3098 } 3099 } else { 3100 if (!addrconf_qdisc_ok(dev)) { 3101 /* device is still not ready. */ 3102 break; 3103 } 3104 3105 if (idev) { 3106 if (idev->if_flags & IF_READY) 3107 /* device is already configured. */ 3108 break; 3109 idev->if_flags |= IF_READY; 3110 } 3111 3112 pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n", 3113 dev->name); 3114 3115 run_pending = 1; 3116 } 3117 3118 switch (dev->type) { 3119 #if IS_ENABLED(CONFIG_IPV6_SIT) 3120 case ARPHRD_SIT: 3121 addrconf_sit_config(dev); 3122 break; 3123 #endif 3124 #if IS_ENABLED(CONFIG_NET_IPGRE) 3125 case ARPHRD_IPGRE: 3126 addrconf_gre_config(dev); 3127 break; 3128 #endif 3129 case ARPHRD_LOOPBACK: 3130 init_loopback(dev); 3131 break; 3132 3133 default: 3134 addrconf_dev_config(dev); 3135 break; 3136 } 3137 3138 if (!IS_ERR_OR_NULL(idev)) { 3139 if (run_pending) 3140 addrconf_dad_run(idev); 3141 3142 /* 3143 * If the MTU changed during the interface down, 3144 * when the interface up, the changed MTU must be 3145 * reflected in the idev as well as routers. 3146 */ 3147 if (idev->cnf.mtu6 != dev->mtu && 3148 dev->mtu >= IPV6_MIN_MTU) { 3149 rt6_mtu_change(dev, dev->mtu); 3150 idev->cnf.mtu6 = dev->mtu; 3151 } 3152 idev->tstamp = jiffies; 3153 inet6_ifinfo_notify(RTM_NEWLINK, idev); 3154 3155 /* 3156 * If the changed mtu during down is lower than 3157 * IPV6_MIN_MTU stop IPv6 on this interface. 3158 */ 3159 if (dev->mtu < IPV6_MIN_MTU) 3160 addrconf_ifdown(dev, 1); 3161 } 3162 break; 3163 3164 case NETDEV_CHANGEMTU: 3165 if (idev && dev->mtu >= IPV6_MIN_MTU) { 3166 rt6_mtu_change(dev, dev->mtu); 3167 idev->cnf.mtu6 = dev->mtu; 3168 break; 3169 } 3170 3171 if (!idev && dev->mtu >= IPV6_MIN_MTU) { 3172 idev = ipv6_add_dev(dev); 3173 if (!IS_ERR(idev)) 3174 break; 3175 } 3176 3177 /* 3178 * if MTU under IPV6_MIN_MTU. 3179 * Stop IPv6 on this interface. 3180 */ 3181 3182 case NETDEV_DOWN: 3183 case NETDEV_UNREGISTER: 3184 /* 3185 * Remove all addresses from this interface. 3186 */ 3187 addrconf_ifdown(dev, event != NETDEV_DOWN); 3188 break; 3189 3190 case NETDEV_CHANGENAME: 3191 if (idev) { 3192 snmp6_unregister_dev(idev); 3193 addrconf_sysctl_unregister(idev); 3194 err = addrconf_sysctl_register(idev); 3195 if (err) 3196 return notifier_from_errno(err); 3197 err = snmp6_register_dev(idev); 3198 if (err) { 3199 addrconf_sysctl_unregister(idev); 3200 return notifier_from_errno(err); 3201 } 3202 } 3203 break; 3204 3205 case NETDEV_PRE_TYPE_CHANGE: 3206 case NETDEV_POST_TYPE_CHANGE: 3207 addrconf_type_change(dev, event); 3208 break; 3209 } 3210 3211 return NOTIFY_OK; 3212 } 3213 3214 /* 3215 * addrconf module should be notified of a device going up 3216 */ 3217 static struct notifier_block ipv6_dev_notf = { 3218 .notifier_call = addrconf_notify, 3219 }; 3220 3221 static void addrconf_type_change(struct net_device *dev, unsigned long event) 3222 { 3223 struct inet6_dev *idev; 3224 ASSERT_RTNL(); 3225 3226 idev = __in6_dev_get(dev); 3227 3228 if (event == NETDEV_POST_TYPE_CHANGE) 3229 ipv6_mc_remap(idev); 3230 else if (event == NETDEV_PRE_TYPE_CHANGE) 3231 ipv6_mc_unmap(idev); 3232 } 3233 3234 static int addrconf_ifdown(struct net_device *dev, int how) 3235 { 3236 struct net *net = dev_net(dev); 3237 struct inet6_dev *idev; 3238 struct inet6_ifaddr *ifa; 3239 int state, i; 3240 3241 ASSERT_RTNL(); 3242 3243 rt6_ifdown(net, dev); 3244 neigh_ifdown(&nd_tbl, dev); 3245 3246 idev = __in6_dev_get(dev); 3247 if (idev == NULL) 3248 return -ENODEV; 3249 3250 /* 3251 * Step 1: remove reference to ipv6 device from parent device. 3252 * Do not dev_put! 3253 */ 3254 if (how) { 3255 idev->dead = 1; 3256 3257 /* protected by rtnl_lock */ 3258 RCU_INIT_POINTER(dev->ip6_ptr, NULL); 3259 3260 /* Step 1.5: remove snmp6 entry */ 3261 snmp6_unregister_dev(idev); 3262 3263 } 3264 3265 /* Step 2: clear hash table */ 3266 for (i = 0; i < IN6_ADDR_HSIZE; i++) { 3267 struct hlist_head *h = &inet6_addr_lst[i]; 3268 3269 spin_lock_bh(&addrconf_hash_lock); 3270 restart: 3271 hlist_for_each_entry_rcu(ifa, h, addr_lst) { 3272 if (ifa->idev == idev) { 3273 hlist_del_init_rcu(&ifa->addr_lst); 3274 addrconf_del_dad_work(ifa); 3275 goto restart; 3276 } 3277 } 3278 spin_unlock_bh(&addrconf_hash_lock); 3279 } 3280 3281 write_lock_bh(&idev->lock); 3282 3283 addrconf_del_rs_timer(idev); 3284 3285 /* Step 2: clear flags for stateless addrconf */ 3286 if (!how) 3287 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY); 3288 3289 if (how && del_timer(&idev->regen_timer)) 3290 in6_dev_put(idev); 3291 3292 /* Step 3: clear tempaddr list */ 3293 while (!list_empty(&idev->tempaddr_list)) { 3294 ifa = list_first_entry(&idev->tempaddr_list, 3295 struct inet6_ifaddr, tmp_list); 3296 list_del(&ifa->tmp_list); 3297 write_unlock_bh(&idev->lock); 3298 spin_lock_bh(&ifa->lock); 3299 3300 if (ifa->ifpub) { 3301 in6_ifa_put(ifa->ifpub); 3302 ifa->ifpub = NULL; 3303 } 3304 spin_unlock_bh(&ifa->lock); 3305 in6_ifa_put(ifa); 3306 write_lock_bh(&idev->lock); 3307 } 3308 3309 while (!list_empty(&idev->addr_list)) { 3310 ifa = list_first_entry(&idev->addr_list, 3311 struct inet6_ifaddr, if_list); 3312 addrconf_del_dad_work(ifa); 3313 3314 list_del(&ifa->if_list); 3315 3316 write_unlock_bh(&idev->lock); 3317 3318 spin_lock_bh(&ifa->lock); 3319 state = ifa->state; 3320 ifa->state = INET6_IFADDR_STATE_DEAD; 3321 spin_unlock_bh(&ifa->lock); 3322 3323 if (state != INET6_IFADDR_STATE_DEAD) { 3324 __ipv6_ifa_notify(RTM_DELADDR, ifa); 3325 inet6addr_notifier_call_chain(NETDEV_DOWN, ifa); 3326 } 3327 in6_ifa_put(ifa); 3328 3329 write_lock_bh(&idev->lock); 3330 } 3331 3332 write_unlock_bh(&idev->lock); 3333 3334 /* Step 5: Discard anycast and multicast list */ 3335 if (how) { 3336 ipv6_ac_destroy_dev(idev); 3337 ipv6_mc_destroy_dev(idev); 3338 } else { 3339 ipv6_mc_down(idev); 3340 } 3341 3342 idev->tstamp = jiffies; 3343 3344 /* Last: Shot the device (if unregistered) */ 3345 if (how) { 3346 addrconf_sysctl_unregister(idev); 3347 neigh_parms_release(&nd_tbl, idev->nd_parms); 3348 neigh_ifdown(&nd_tbl, dev); 3349 in6_dev_put(idev); 3350 } 3351 return 0; 3352 } 3353 3354 static void addrconf_rs_timer(unsigned long data) 3355 { 3356 struct inet6_dev *idev = (struct inet6_dev *)data; 3357 struct net_device *dev = idev->dev; 3358 struct in6_addr lladdr; 3359 3360 write_lock(&idev->lock); 3361 if (idev->dead || !(idev->if_flags & IF_READY)) 3362 goto out; 3363 3364 if (!ipv6_accept_ra(idev)) 3365 goto out; 3366 3367 /* Announcement received after solicitation was sent */ 3368 if (idev->if_flags & IF_RA_RCVD) 3369 goto out; 3370 3371 if (idev->rs_probes++ < idev->cnf.rtr_solicits) { 3372 write_unlock(&idev->lock); 3373 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE)) 3374 ndisc_send_rs(dev, &lladdr, 3375 &in6addr_linklocal_allrouters); 3376 else 3377 goto put; 3378 3379 write_lock(&idev->lock); 3380 /* The wait after the last probe can be shorter */ 3381 addrconf_mod_rs_timer(idev, (idev->rs_probes == 3382 idev->cnf.rtr_solicits) ? 3383 idev->cnf.rtr_solicit_delay : 3384 idev->cnf.rtr_solicit_interval); 3385 } else { 3386 /* 3387 * Note: we do not support deprecated "all on-link" 3388 * assumption any longer. 3389 */ 3390 pr_debug("%s: no IPv6 routers present\n", idev->dev->name); 3391 } 3392 3393 out: 3394 write_unlock(&idev->lock); 3395 put: 3396 in6_dev_put(idev); 3397 } 3398 3399 /* 3400 * Duplicate Address Detection 3401 */ 3402 static void addrconf_dad_kick(struct inet6_ifaddr *ifp) 3403 { 3404 unsigned long rand_num; 3405 struct inet6_dev *idev = ifp->idev; 3406 3407 if (ifp->flags & IFA_F_OPTIMISTIC) 3408 rand_num = 0; 3409 else 3410 rand_num = prandom_u32() % (idev->cnf.rtr_solicit_delay ? : 1); 3411 3412 ifp->dad_probes = idev->cnf.dad_transmits; 3413 addrconf_mod_dad_work(ifp, rand_num); 3414 } 3415 3416 static void addrconf_dad_begin(struct inet6_ifaddr *ifp) 3417 { 3418 struct inet6_dev *idev = ifp->idev; 3419 struct net_device *dev = idev->dev; 3420 3421 addrconf_join_solict(dev, &ifp->addr); 3422 3423 prandom_seed((__force u32) ifp->addr.s6_addr32[3]); 3424 3425 read_lock_bh(&idev->lock); 3426 spin_lock(&ifp->lock); 3427 if (ifp->state == INET6_IFADDR_STATE_DEAD) 3428 goto out; 3429 3430 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) || 3431 idev->cnf.accept_dad < 1 || 3432 !(ifp->flags&IFA_F_TENTATIVE) || 3433 ifp->flags & IFA_F_NODAD) { 3434 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED); 3435 spin_unlock(&ifp->lock); 3436 read_unlock_bh(&idev->lock); 3437 3438 addrconf_dad_completed(ifp); 3439 return; 3440 } 3441 3442 if (!(idev->if_flags & IF_READY)) { 3443 spin_unlock(&ifp->lock); 3444 read_unlock_bh(&idev->lock); 3445 /* 3446 * If the device is not ready: 3447 * - keep it tentative if it is a permanent address. 3448 * - otherwise, kill it. 3449 */ 3450 in6_ifa_hold(ifp); 3451 addrconf_dad_stop(ifp, 0); 3452 return; 3453 } 3454 3455 /* 3456 * Optimistic nodes can start receiving 3457 * Frames right away 3458 */ 3459 if (ifp->flags & IFA_F_OPTIMISTIC) { 3460 ip6_ins_rt(ifp->rt); 3461 if (ipv6_use_optimistic_addr(idev)) { 3462 /* Because optimistic nodes can use this address, 3463 * notify listeners. If DAD fails, RTM_DELADDR is sent. 3464 */ 3465 ipv6_ifa_notify(RTM_NEWADDR, ifp); 3466 } 3467 } 3468 3469 addrconf_dad_kick(ifp); 3470 out: 3471 spin_unlock(&ifp->lock); 3472 read_unlock_bh(&idev->lock); 3473 } 3474 3475 static void addrconf_dad_start(struct inet6_ifaddr *ifp) 3476 { 3477 bool begin_dad = false; 3478 3479 spin_lock_bh(&ifp->lock); 3480 if (ifp->state != INET6_IFADDR_STATE_DEAD) { 3481 ifp->state = INET6_IFADDR_STATE_PREDAD; 3482 begin_dad = true; 3483 } 3484 spin_unlock_bh(&ifp->lock); 3485 3486 if (begin_dad) 3487 addrconf_mod_dad_work(ifp, 0); 3488 } 3489 3490 static void addrconf_dad_work(struct work_struct *w) 3491 { 3492 struct inet6_ifaddr *ifp = container_of(to_delayed_work(w), 3493 struct inet6_ifaddr, 3494 dad_work); 3495 struct inet6_dev *idev = ifp->idev; 3496 struct in6_addr mcaddr; 3497 3498 enum { 3499 DAD_PROCESS, 3500 DAD_BEGIN, 3501 DAD_ABORT, 3502 } action = DAD_PROCESS; 3503 3504 rtnl_lock(); 3505 3506 spin_lock_bh(&ifp->lock); 3507 if (ifp->state == INET6_IFADDR_STATE_PREDAD) { 3508 action = DAD_BEGIN; 3509 ifp->state = INET6_IFADDR_STATE_DAD; 3510 } else if (ifp->state == INET6_IFADDR_STATE_ERRDAD) { 3511 action = DAD_ABORT; 3512 ifp->state = INET6_IFADDR_STATE_POSTDAD; 3513 } 3514 spin_unlock_bh(&ifp->lock); 3515 3516 if (action == DAD_BEGIN) { 3517 addrconf_dad_begin(ifp); 3518 goto out; 3519 } else if (action == DAD_ABORT) { 3520 addrconf_dad_stop(ifp, 1); 3521 goto out; 3522 } 3523 3524 if (!ifp->dad_probes && addrconf_dad_end(ifp)) 3525 goto out; 3526 3527 write_lock_bh(&idev->lock); 3528 if (idev->dead || !(idev->if_flags & IF_READY)) { 3529 write_unlock_bh(&idev->lock); 3530 goto out; 3531 } 3532 3533 spin_lock(&ifp->lock); 3534 if (ifp->state == INET6_IFADDR_STATE_DEAD) { 3535 spin_unlock(&ifp->lock); 3536 write_unlock_bh(&idev->lock); 3537 goto out; 3538 } 3539 3540 if (ifp->dad_probes == 0) { 3541 /* 3542 * DAD was successful 3543 */ 3544 3545 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED); 3546 spin_unlock(&ifp->lock); 3547 write_unlock_bh(&idev->lock); 3548 3549 addrconf_dad_completed(ifp); 3550 3551 goto out; 3552 } 3553 3554 ifp->dad_probes--; 3555 addrconf_mod_dad_work(ifp, 3556 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME)); 3557 spin_unlock(&ifp->lock); 3558 write_unlock_bh(&idev->lock); 3559 3560 /* send a neighbour solicitation for our addr */ 3561 addrconf_addr_solict_mult(&ifp->addr, &mcaddr); 3562 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &in6addr_any); 3563 out: 3564 in6_ifa_put(ifp); 3565 rtnl_unlock(); 3566 } 3567 3568 /* ifp->idev must be at least read locked */ 3569 static bool ipv6_lonely_lladdr(struct inet6_ifaddr *ifp) 3570 { 3571 struct inet6_ifaddr *ifpiter; 3572 struct inet6_dev *idev = ifp->idev; 3573 3574 list_for_each_entry_reverse(ifpiter, &idev->addr_list, if_list) { 3575 if (ifpiter->scope > IFA_LINK) 3576 break; 3577 if (ifp != ifpiter && ifpiter->scope == IFA_LINK && 3578 (ifpiter->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE| 3579 IFA_F_OPTIMISTIC|IFA_F_DADFAILED)) == 3580 IFA_F_PERMANENT) 3581 return false; 3582 } 3583 return true; 3584 } 3585 3586 static void addrconf_dad_completed(struct inet6_ifaddr *ifp) 3587 { 3588 struct net_device *dev = ifp->idev->dev; 3589 struct in6_addr lladdr; 3590 bool send_rs, send_mld; 3591 3592 addrconf_del_dad_work(ifp); 3593 3594 /* 3595 * Configure the address for reception. Now it is valid. 3596 */ 3597 3598 ipv6_ifa_notify(RTM_NEWADDR, ifp); 3599 3600 /* If added prefix is link local and we are prepared to process 3601 router advertisements, start sending router solicitations. 3602 */ 3603 3604 read_lock_bh(&ifp->idev->lock); 3605 send_mld = ifp->scope == IFA_LINK && ipv6_lonely_lladdr(ifp); 3606 send_rs = send_mld && 3607 ipv6_accept_ra(ifp->idev) && 3608 ifp->idev->cnf.rtr_solicits > 0 && 3609 (dev->flags&IFF_LOOPBACK) == 0; 3610 read_unlock_bh(&ifp->idev->lock); 3611 3612 /* While dad is in progress mld report's source address is in6_addrany. 3613 * Resend with proper ll now. 3614 */ 3615 if (send_mld) 3616 ipv6_mc_dad_complete(ifp->idev); 3617 3618 if (send_rs) { 3619 /* 3620 * If a host as already performed a random delay 3621 * [...] as part of DAD [...] there is no need 3622 * to delay again before sending the first RS 3623 */ 3624 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE)) 3625 return; 3626 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters); 3627 3628 write_lock_bh(&ifp->idev->lock); 3629 spin_lock(&ifp->lock); 3630 ifp->idev->rs_probes = 1; 3631 ifp->idev->if_flags |= IF_RS_SENT; 3632 addrconf_mod_rs_timer(ifp->idev, 3633 ifp->idev->cnf.rtr_solicit_interval); 3634 spin_unlock(&ifp->lock); 3635 write_unlock_bh(&ifp->idev->lock); 3636 } 3637 } 3638 3639 static void addrconf_dad_run(struct inet6_dev *idev) 3640 { 3641 struct inet6_ifaddr *ifp; 3642 3643 read_lock_bh(&idev->lock); 3644 list_for_each_entry(ifp, &idev->addr_list, if_list) { 3645 spin_lock(&ifp->lock); 3646 if (ifp->flags & IFA_F_TENTATIVE && 3647 ifp->state == INET6_IFADDR_STATE_DAD) 3648 addrconf_dad_kick(ifp); 3649 spin_unlock(&ifp->lock); 3650 } 3651 read_unlock_bh(&idev->lock); 3652 } 3653 3654 #ifdef CONFIG_PROC_FS 3655 struct if6_iter_state { 3656 struct seq_net_private p; 3657 int bucket; 3658 int offset; 3659 }; 3660 3661 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos) 3662 { 3663 struct inet6_ifaddr *ifa = NULL; 3664 struct if6_iter_state *state = seq->private; 3665 struct net *net = seq_file_net(seq); 3666 int p = 0; 3667 3668 /* initial bucket if pos is 0 */ 3669 if (pos == 0) { 3670 state->bucket = 0; 3671 state->offset = 0; 3672 } 3673 3674 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) { 3675 hlist_for_each_entry_rcu_bh(ifa, &inet6_addr_lst[state->bucket], 3676 addr_lst) { 3677 if (!net_eq(dev_net(ifa->idev->dev), net)) 3678 continue; 3679 /* sync with offset */ 3680 if (p < state->offset) { 3681 p++; 3682 continue; 3683 } 3684 state->offset++; 3685 return ifa; 3686 } 3687 3688 /* prepare for next bucket */ 3689 state->offset = 0; 3690 p = 0; 3691 } 3692 return NULL; 3693 } 3694 3695 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, 3696 struct inet6_ifaddr *ifa) 3697 { 3698 struct if6_iter_state *state = seq->private; 3699 struct net *net = seq_file_net(seq); 3700 3701 hlist_for_each_entry_continue_rcu_bh(ifa, addr_lst) { 3702 if (!net_eq(dev_net(ifa->idev->dev), net)) 3703 continue; 3704 state->offset++; 3705 return ifa; 3706 } 3707 3708 while (++state->bucket < IN6_ADDR_HSIZE) { 3709 state->offset = 0; 3710 hlist_for_each_entry_rcu_bh(ifa, 3711 &inet6_addr_lst[state->bucket], addr_lst) { 3712 if (!net_eq(dev_net(ifa->idev->dev), net)) 3713 continue; 3714 state->offset++; 3715 return ifa; 3716 } 3717 } 3718 3719 return NULL; 3720 } 3721 3722 static void *if6_seq_start(struct seq_file *seq, loff_t *pos) 3723 __acquires(rcu_bh) 3724 { 3725 rcu_read_lock_bh(); 3726 return if6_get_first(seq, *pos); 3727 } 3728 3729 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos) 3730 { 3731 struct inet6_ifaddr *ifa; 3732 3733 ifa = if6_get_next(seq, v); 3734 ++*pos; 3735 return ifa; 3736 } 3737 3738 static void if6_seq_stop(struct seq_file *seq, void *v) 3739 __releases(rcu_bh) 3740 { 3741 rcu_read_unlock_bh(); 3742 } 3743 3744 static int if6_seq_show(struct seq_file *seq, void *v) 3745 { 3746 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v; 3747 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n", 3748 &ifp->addr, 3749 ifp->idev->dev->ifindex, 3750 ifp->prefix_len, 3751 ifp->scope, 3752 (u8) ifp->flags, 3753 ifp->idev->dev->name); 3754 return 0; 3755 } 3756 3757 static const struct seq_operations if6_seq_ops = { 3758 .start = if6_seq_start, 3759 .next = if6_seq_next, 3760 .show = if6_seq_show, 3761 .stop = if6_seq_stop, 3762 }; 3763 3764 static int if6_seq_open(struct inode *inode, struct file *file) 3765 { 3766 return seq_open_net(inode, file, &if6_seq_ops, 3767 sizeof(struct if6_iter_state)); 3768 } 3769 3770 static const struct file_operations if6_fops = { 3771 .owner = THIS_MODULE, 3772 .open = if6_seq_open, 3773 .read = seq_read, 3774 .llseek = seq_lseek, 3775 .release = seq_release_net, 3776 }; 3777 3778 static int __net_init if6_proc_net_init(struct net *net) 3779 { 3780 if (!proc_create("if_inet6", S_IRUGO, net->proc_net, &if6_fops)) 3781 return -ENOMEM; 3782 return 0; 3783 } 3784 3785 static void __net_exit if6_proc_net_exit(struct net *net) 3786 { 3787 remove_proc_entry("if_inet6", net->proc_net); 3788 } 3789 3790 static struct pernet_operations if6_proc_net_ops = { 3791 .init = if6_proc_net_init, 3792 .exit = if6_proc_net_exit, 3793 }; 3794 3795 int __init if6_proc_init(void) 3796 { 3797 return register_pernet_subsys(&if6_proc_net_ops); 3798 } 3799 3800 void if6_proc_exit(void) 3801 { 3802 unregister_pernet_subsys(&if6_proc_net_ops); 3803 } 3804 #endif /* CONFIG_PROC_FS */ 3805 3806 #if IS_ENABLED(CONFIG_IPV6_MIP6) 3807 /* Check if address is a home address configured on any interface. */ 3808 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr) 3809 { 3810 int ret = 0; 3811 struct inet6_ifaddr *ifp = NULL; 3812 unsigned int hash = inet6_addr_hash(addr); 3813 3814 rcu_read_lock_bh(); 3815 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) { 3816 if (!net_eq(dev_net(ifp->idev->dev), net)) 3817 continue; 3818 if (ipv6_addr_equal(&ifp->addr, addr) && 3819 (ifp->flags & IFA_F_HOMEADDRESS)) { 3820 ret = 1; 3821 break; 3822 } 3823 } 3824 rcu_read_unlock_bh(); 3825 return ret; 3826 } 3827 #endif 3828 3829 /* 3830 * Periodic address status verification 3831 */ 3832 3833 static void addrconf_verify_rtnl(void) 3834 { 3835 unsigned long now, next, next_sec, next_sched; 3836 struct inet6_ifaddr *ifp; 3837 int i; 3838 3839 ASSERT_RTNL(); 3840 3841 rcu_read_lock_bh(); 3842 now = jiffies; 3843 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY); 3844 3845 cancel_delayed_work(&addr_chk_work); 3846 3847 for (i = 0; i < IN6_ADDR_HSIZE; i++) { 3848 restart: 3849 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[i], addr_lst) { 3850 unsigned long age; 3851 3852 /* When setting preferred_lft to a value not zero or 3853 * infinity, while valid_lft is infinity 3854 * IFA_F_PERMANENT has a non-infinity life time. 3855 */ 3856 if ((ifp->flags & IFA_F_PERMANENT) && 3857 (ifp->prefered_lft == INFINITY_LIFE_TIME)) 3858 continue; 3859 3860 spin_lock(&ifp->lock); 3861 /* We try to batch several events at once. */ 3862 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ; 3863 3864 if (ifp->valid_lft != INFINITY_LIFE_TIME && 3865 age >= ifp->valid_lft) { 3866 spin_unlock(&ifp->lock); 3867 in6_ifa_hold(ifp); 3868 ipv6_del_addr(ifp); 3869 goto restart; 3870 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) { 3871 spin_unlock(&ifp->lock); 3872 continue; 3873 } else if (age >= ifp->prefered_lft) { 3874 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */ 3875 int deprecate = 0; 3876 3877 if (!(ifp->flags&IFA_F_DEPRECATED)) { 3878 deprecate = 1; 3879 ifp->flags |= IFA_F_DEPRECATED; 3880 } 3881 3882 if ((ifp->valid_lft != INFINITY_LIFE_TIME) && 3883 (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))) 3884 next = ifp->tstamp + ifp->valid_lft * HZ; 3885 3886 spin_unlock(&ifp->lock); 3887 3888 if (deprecate) { 3889 in6_ifa_hold(ifp); 3890 3891 ipv6_ifa_notify(0, ifp); 3892 in6_ifa_put(ifp); 3893 goto restart; 3894 } 3895 } else if ((ifp->flags&IFA_F_TEMPORARY) && 3896 !(ifp->flags&IFA_F_TENTATIVE)) { 3897 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry * 3898 ifp->idev->cnf.dad_transmits * 3899 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME) / HZ; 3900 3901 if (age >= ifp->prefered_lft - regen_advance) { 3902 struct inet6_ifaddr *ifpub = ifp->ifpub; 3903 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 3904 next = ifp->tstamp + ifp->prefered_lft * HZ; 3905 if (!ifp->regen_count && ifpub) { 3906 ifp->regen_count++; 3907 in6_ifa_hold(ifp); 3908 in6_ifa_hold(ifpub); 3909 spin_unlock(&ifp->lock); 3910 3911 spin_lock(&ifpub->lock); 3912 ifpub->regen_count = 0; 3913 spin_unlock(&ifpub->lock); 3914 ipv6_create_tempaddr(ifpub, ifp); 3915 in6_ifa_put(ifpub); 3916 in6_ifa_put(ifp); 3917 goto restart; 3918 } 3919 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next)) 3920 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ; 3921 spin_unlock(&ifp->lock); 3922 } else { 3923 /* ifp->prefered_lft <= ifp->valid_lft */ 3924 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 3925 next = ifp->tstamp + ifp->prefered_lft * HZ; 3926 spin_unlock(&ifp->lock); 3927 } 3928 } 3929 } 3930 3931 next_sec = round_jiffies_up(next); 3932 next_sched = next; 3933 3934 /* If rounded timeout is accurate enough, accept it. */ 3935 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ)) 3936 next_sched = next_sec; 3937 3938 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */ 3939 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX)) 3940 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX; 3941 3942 ADBG(KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n", 3943 now, next, next_sec, next_sched); 3944 mod_delayed_work(addrconf_wq, &addr_chk_work, next_sched - now); 3945 rcu_read_unlock_bh(); 3946 } 3947 3948 static void addrconf_verify_work(struct work_struct *w) 3949 { 3950 rtnl_lock(); 3951 addrconf_verify_rtnl(); 3952 rtnl_unlock(); 3953 } 3954 3955 static void addrconf_verify(void) 3956 { 3957 mod_delayed_work(addrconf_wq, &addr_chk_work, 0); 3958 } 3959 3960 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local, 3961 struct in6_addr **peer_pfx) 3962 { 3963 struct in6_addr *pfx = NULL; 3964 3965 *peer_pfx = NULL; 3966 3967 if (addr) 3968 pfx = nla_data(addr); 3969 3970 if (local) { 3971 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx))) 3972 *peer_pfx = pfx; 3973 pfx = nla_data(local); 3974 } 3975 3976 return pfx; 3977 } 3978 3979 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = { 3980 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) }, 3981 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) }, 3982 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) }, 3983 [IFA_FLAGS] = { .len = sizeof(u32) }, 3984 }; 3985 3986 static int 3987 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh) 3988 { 3989 struct net *net = sock_net(skb->sk); 3990 struct ifaddrmsg *ifm; 3991 struct nlattr *tb[IFA_MAX+1]; 3992 struct in6_addr *pfx, *peer_pfx; 3993 u32 ifa_flags; 3994 int err; 3995 3996 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy); 3997 if (err < 0) 3998 return err; 3999 4000 ifm = nlmsg_data(nlh); 4001 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx); 4002 if (pfx == NULL) 4003 return -EINVAL; 4004 4005 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags; 4006 4007 /* We ignore other flags so far. */ 4008 ifa_flags &= IFA_F_MANAGETEMPADDR; 4009 4010 return inet6_addr_del(net, ifm->ifa_index, ifa_flags, pfx, 4011 ifm->ifa_prefixlen); 4012 } 4013 4014 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u32 ifa_flags, 4015 u32 prefered_lft, u32 valid_lft) 4016 { 4017 u32 flags; 4018 clock_t expires; 4019 unsigned long timeout; 4020 bool was_managetempaddr; 4021 bool had_prefixroute; 4022 4023 ASSERT_RTNL(); 4024 4025 if (!valid_lft || (prefered_lft > valid_lft)) 4026 return -EINVAL; 4027 4028 if (ifa_flags & IFA_F_MANAGETEMPADDR && 4029 (ifp->flags & IFA_F_TEMPORARY || ifp->prefix_len != 64)) 4030 return -EINVAL; 4031 4032 timeout = addrconf_timeout_fixup(valid_lft, HZ); 4033 if (addrconf_finite_timeout(timeout)) { 4034 expires = jiffies_to_clock_t(timeout * HZ); 4035 valid_lft = timeout; 4036 flags = RTF_EXPIRES; 4037 } else { 4038 expires = 0; 4039 flags = 0; 4040 ifa_flags |= IFA_F_PERMANENT; 4041 } 4042 4043 timeout = addrconf_timeout_fixup(prefered_lft, HZ); 4044 if (addrconf_finite_timeout(timeout)) { 4045 if (timeout == 0) 4046 ifa_flags |= IFA_F_DEPRECATED; 4047 prefered_lft = timeout; 4048 } 4049 4050 spin_lock_bh(&ifp->lock); 4051 was_managetempaddr = ifp->flags & IFA_F_MANAGETEMPADDR; 4052 had_prefixroute = ifp->flags & IFA_F_PERMANENT && 4053 !(ifp->flags & IFA_F_NOPREFIXROUTE); 4054 ifp->flags &= ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | 4055 IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR | 4056 IFA_F_NOPREFIXROUTE); 4057 ifp->flags |= ifa_flags; 4058 ifp->tstamp = jiffies; 4059 ifp->valid_lft = valid_lft; 4060 ifp->prefered_lft = prefered_lft; 4061 4062 spin_unlock_bh(&ifp->lock); 4063 if (!(ifp->flags&IFA_F_TENTATIVE)) 4064 ipv6_ifa_notify(0, ifp); 4065 4066 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) { 4067 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev, 4068 expires, flags); 4069 } else if (had_prefixroute) { 4070 enum cleanup_prefix_rt_t action; 4071 unsigned long rt_expires; 4072 4073 write_lock_bh(&ifp->idev->lock); 4074 action = check_cleanup_prefix_route(ifp, &rt_expires); 4075 write_unlock_bh(&ifp->idev->lock); 4076 4077 if (action != CLEANUP_PREFIX_RT_NOP) { 4078 cleanup_prefix_route(ifp, rt_expires, 4079 action == CLEANUP_PREFIX_RT_DEL); 4080 } 4081 } 4082 4083 if (was_managetempaddr || ifp->flags & IFA_F_MANAGETEMPADDR) { 4084 if (was_managetempaddr && !(ifp->flags & IFA_F_MANAGETEMPADDR)) 4085 valid_lft = prefered_lft = 0; 4086 manage_tempaddrs(ifp->idev, ifp, valid_lft, prefered_lft, 4087 !was_managetempaddr, jiffies); 4088 } 4089 4090 addrconf_verify_rtnl(); 4091 4092 return 0; 4093 } 4094 4095 static int 4096 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh) 4097 { 4098 struct net *net = sock_net(skb->sk); 4099 struct ifaddrmsg *ifm; 4100 struct nlattr *tb[IFA_MAX+1]; 4101 struct in6_addr *pfx, *peer_pfx; 4102 struct inet6_ifaddr *ifa; 4103 struct net_device *dev; 4104 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME; 4105 u32 ifa_flags; 4106 int err; 4107 4108 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy); 4109 if (err < 0) 4110 return err; 4111 4112 ifm = nlmsg_data(nlh); 4113 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx); 4114 if (pfx == NULL) 4115 return -EINVAL; 4116 4117 if (tb[IFA_CACHEINFO]) { 4118 struct ifa_cacheinfo *ci; 4119 4120 ci = nla_data(tb[IFA_CACHEINFO]); 4121 valid_lft = ci->ifa_valid; 4122 preferred_lft = ci->ifa_prefered; 4123 } else { 4124 preferred_lft = INFINITY_LIFE_TIME; 4125 valid_lft = INFINITY_LIFE_TIME; 4126 } 4127 4128 dev = __dev_get_by_index(net, ifm->ifa_index); 4129 if (dev == NULL) 4130 return -ENODEV; 4131 4132 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags; 4133 4134 /* We ignore other flags so far. */ 4135 ifa_flags &= IFA_F_NODAD | IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR | 4136 IFA_F_NOPREFIXROUTE | IFA_F_MCAUTOJOIN; 4137 4138 ifa = ipv6_get_ifaddr(net, pfx, dev, 1); 4139 if (ifa == NULL) { 4140 /* 4141 * It would be best to check for !NLM_F_CREATE here but 4142 * userspace already relies on not having to provide this. 4143 */ 4144 return inet6_addr_add(net, ifm->ifa_index, pfx, peer_pfx, 4145 ifm->ifa_prefixlen, ifa_flags, 4146 preferred_lft, valid_lft); 4147 } 4148 4149 if (nlh->nlmsg_flags & NLM_F_EXCL || 4150 !(nlh->nlmsg_flags & NLM_F_REPLACE)) 4151 err = -EEXIST; 4152 else 4153 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft); 4154 4155 in6_ifa_put(ifa); 4156 4157 return err; 4158 } 4159 4160 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u32 flags, 4161 u8 scope, int ifindex) 4162 { 4163 struct ifaddrmsg *ifm; 4164 4165 ifm = nlmsg_data(nlh); 4166 ifm->ifa_family = AF_INET6; 4167 ifm->ifa_prefixlen = prefixlen; 4168 ifm->ifa_flags = flags; 4169 ifm->ifa_scope = scope; 4170 ifm->ifa_index = ifindex; 4171 } 4172 4173 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp, 4174 unsigned long tstamp, u32 preferred, u32 valid) 4175 { 4176 struct ifa_cacheinfo ci; 4177 4178 ci.cstamp = cstamp_delta(cstamp); 4179 ci.tstamp = cstamp_delta(tstamp); 4180 ci.ifa_prefered = preferred; 4181 ci.ifa_valid = valid; 4182 4183 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci); 4184 } 4185 4186 static inline int rt_scope(int ifa_scope) 4187 { 4188 if (ifa_scope & IFA_HOST) 4189 return RT_SCOPE_HOST; 4190 else if (ifa_scope & IFA_LINK) 4191 return RT_SCOPE_LINK; 4192 else if (ifa_scope & IFA_SITE) 4193 return RT_SCOPE_SITE; 4194 else 4195 return RT_SCOPE_UNIVERSE; 4196 } 4197 4198 static inline int inet6_ifaddr_msgsize(void) 4199 { 4200 return NLMSG_ALIGN(sizeof(struct ifaddrmsg)) 4201 + nla_total_size(16) /* IFA_LOCAL */ 4202 + nla_total_size(16) /* IFA_ADDRESS */ 4203 + nla_total_size(sizeof(struct ifa_cacheinfo)) 4204 + nla_total_size(4) /* IFA_FLAGS */; 4205 } 4206 4207 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa, 4208 u32 portid, u32 seq, int event, unsigned int flags) 4209 { 4210 struct nlmsghdr *nlh; 4211 u32 preferred, valid; 4212 4213 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags); 4214 if (nlh == NULL) 4215 return -EMSGSIZE; 4216 4217 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope), 4218 ifa->idev->dev->ifindex); 4219 4220 if (!((ifa->flags&IFA_F_PERMANENT) && 4221 (ifa->prefered_lft == INFINITY_LIFE_TIME))) { 4222 preferred = ifa->prefered_lft; 4223 valid = ifa->valid_lft; 4224 if (preferred != INFINITY_LIFE_TIME) { 4225 long tval = (jiffies - ifa->tstamp)/HZ; 4226 if (preferred > tval) 4227 preferred -= tval; 4228 else 4229 preferred = 0; 4230 if (valid != INFINITY_LIFE_TIME) { 4231 if (valid > tval) 4232 valid -= tval; 4233 else 4234 valid = 0; 4235 } 4236 } 4237 } else { 4238 preferred = INFINITY_LIFE_TIME; 4239 valid = INFINITY_LIFE_TIME; 4240 } 4241 4242 if (!ipv6_addr_any(&ifa->peer_addr)) { 4243 if (nla_put(skb, IFA_LOCAL, 16, &ifa->addr) < 0 || 4244 nla_put(skb, IFA_ADDRESS, 16, &ifa->peer_addr) < 0) 4245 goto error; 4246 } else 4247 if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0) 4248 goto error; 4249 4250 if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) 4251 goto error; 4252 4253 if (nla_put_u32(skb, IFA_FLAGS, ifa->flags) < 0) 4254 goto error; 4255 4256 nlmsg_end(skb, nlh); 4257 return 0; 4258 4259 error: 4260 nlmsg_cancel(skb, nlh); 4261 return -EMSGSIZE; 4262 } 4263 4264 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca, 4265 u32 portid, u32 seq, int event, u16 flags) 4266 { 4267 struct nlmsghdr *nlh; 4268 u8 scope = RT_SCOPE_UNIVERSE; 4269 int ifindex = ifmca->idev->dev->ifindex; 4270 4271 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE) 4272 scope = RT_SCOPE_SITE; 4273 4274 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags); 4275 if (nlh == NULL) 4276 return -EMSGSIZE; 4277 4278 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 4279 if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 || 4280 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp, 4281 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 4282 nlmsg_cancel(skb, nlh); 4283 return -EMSGSIZE; 4284 } 4285 4286 nlmsg_end(skb, nlh); 4287 return 0; 4288 } 4289 4290 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca, 4291 u32 portid, u32 seq, int event, unsigned int flags) 4292 { 4293 struct nlmsghdr *nlh; 4294 u8 scope = RT_SCOPE_UNIVERSE; 4295 int ifindex = ifaca->aca_idev->dev->ifindex; 4296 4297 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE) 4298 scope = RT_SCOPE_SITE; 4299 4300 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags); 4301 if (nlh == NULL) 4302 return -EMSGSIZE; 4303 4304 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 4305 if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 || 4306 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp, 4307 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 4308 nlmsg_cancel(skb, nlh); 4309 return -EMSGSIZE; 4310 } 4311 4312 nlmsg_end(skb, nlh); 4313 return 0; 4314 } 4315 4316 enum addr_type_t { 4317 UNICAST_ADDR, 4318 MULTICAST_ADDR, 4319 ANYCAST_ADDR, 4320 }; 4321 4322 /* called with rcu_read_lock() */ 4323 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb, 4324 struct netlink_callback *cb, enum addr_type_t type, 4325 int s_ip_idx, int *p_ip_idx) 4326 { 4327 struct ifmcaddr6 *ifmca; 4328 struct ifacaddr6 *ifaca; 4329 int err = 1; 4330 int ip_idx = *p_ip_idx; 4331 4332 read_lock_bh(&idev->lock); 4333 switch (type) { 4334 case UNICAST_ADDR: { 4335 struct inet6_ifaddr *ifa; 4336 4337 /* unicast address incl. temp addr */ 4338 list_for_each_entry(ifa, &idev->addr_list, if_list) { 4339 if (++ip_idx < s_ip_idx) 4340 continue; 4341 err = inet6_fill_ifaddr(skb, ifa, 4342 NETLINK_CB(cb->skb).portid, 4343 cb->nlh->nlmsg_seq, 4344 RTM_NEWADDR, 4345 NLM_F_MULTI); 4346 if (err < 0) 4347 break; 4348 nl_dump_check_consistent(cb, nlmsg_hdr(skb)); 4349 } 4350 break; 4351 } 4352 case MULTICAST_ADDR: 4353 /* multicast address */ 4354 for (ifmca = idev->mc_list; ifmca; 4355 ifmca = ifmca->next, ip_idx++) { 4356 if (ip_idx < s_ip_idx) 4357 continue; 4358 err = inet6_fill_ifmcaddr(skb, ifmca, 4359 NETLINK_CB(cb->skb).portid, 4360 cb->nlh->nlmsg_seq, 4361 RTM_GETMULTICAST, 4362 NLM_F_MULTI); 4363 if (err < 0) 4364 break; 4365 } 4366 break; 4367 case ANYCAST_ADDR: 4368 /* anycast address */ 4369 for (ifaca = idev->ac_list; ifaca; 4370 ifaca = ifaca->aca_next, ip_idx++) { 4371 if (ip_idx < s_ip_idx) 4372 continue; 4373 err = inet6_fill_ifacaddr(skb, ifaca, 4374 NETLINK_CB(cb->skb).portid, 4375 cb->nlh->nlmsg_seq, 4376 RTM_GETANYCAST, 4377 NLM_F_MULTI); 4378 if (err < 0) 4379 break; 4380 } 4381 break; 4382 default: 4383 break; 4384 } 4385 read_unlock_bh(&idev->lock); 4386 *p_ip_idx = ip_idx; 4387 return err; 4388 } 4389 4390 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb, 4391 enum addr_type_t type) 4392 { 4393 struct net *net = sock_net(skb->sk); 4394 int h, s_h; 4395 int idx, ip_idx; 4396 int s_idx, s_ip_idx; 4397 struct net_device *dev; 4398 struct inet6_dev *idev; 4399 struct hlist_head *head; 4400 4401 s_h = cb->args[0]; 4402 s_idx = idx = cb->args[1]; 4403 s_ip_idx = ip_idx = cb->args[2]; 4404 4405 rcu_read_lock(); 4406 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ net->dev_base_seq; 4407 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 4408 idx = 0; 4409 head = &net->dev_index_head[h]; 4410 hlist_for_each_entry_rcu(dev, head, index_hlist) { 4411 if (idx < s_idx) 4412 goto cont; 4413 if (h > s_h || idx > s_idx) 4414 s_ip_idx = 0; 4415 ip_idx = 0; 4416 idev = __in6_dev_get(dev); 4417 if (!idev) 4418 goto cont; 4419 4420 if (in6_dump_addrs(idev, skb, cb, type, 4421 s_ip_idx, &ip_idx) < 0) 4422 goto done; 4423 cont: 4424 idx++; 4425 } 4426 } 4427 done: 4428 rcu_read_unlock(); 4429 cb->args[0] = h; 4430 cb->args[1] = idx; 4431 cb->args[2] = ip_idx; 4432 4433 return skb->len; 4434 } 4435 4436 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb) 4437 { 4438 enum addr_type_t type = UNICAST_ADDR; 4439 4440 return inet6_dump_addr(skb, cb, type); 4441 } 4442 4443 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb) 4444 { 4445 enum addr_type_t type = MULTICAST_ADDR; 4446 4447 return inet6_dump_addr(skb, cb, type); 4448 } 4449 4450 4451 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb) 4452 { 4453 enum addr_type_t type = ANYCAST_ADDR; 4454 4455 return inet6_dump_addr(skb, cb, type); 4456 } 4457 4458 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh) 4459 { 4460 struct net *net = sock_net(in_skb->sk); 4461 struct ifaddrmsg *ifm; 4462 struct nlattr *tb[IFA_MAX+1]; 4463 struct in6_addr *addr = NULL, *peer; 4464 struct net_device *dev = NULL; 4465 struct inet6_ifaddr *ifa; 4466 struct sk_buff *skb; 4467 int err; 4468 4469 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy); 4470 if (err < 0) 4471 goto errout; 4472 4473 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer); 4474 if (addr == NULL) { 4475 err = -EINVAL; 4476 goto errout; 4477 } 4478 4479 ifm = nlmsg_data(nlh); 4480 if (ifm->ifa_index) 4481 dev = __dev_get_by_index(net, ifm->ifa_index); 4482 4483 ifa = ipv6_get_ifaddr(net, addr, dev, 1); 4484 if (!ifa) { 4485 err = -EADDRNOTAVAIL; 4486 goto errout; 4487 } 4488 4489 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL); 4490 if (!skb) { 4491 err = -ENOBUFS; 4492 goto errout_ifa; 4493 } 4494 4495 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).portid, 4496 nlh->nlmsg_seq, RTM_NEWADDR, 0); 4497 if (err < 0) { 4498 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 4499 WARN_ON(err == -EMSGSIZE); 4500 kfree_skb(skb); 4501 goto errout_ifa; 4502 } 4503 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid); 4504 errout_ifa: 4505 in6_ifa_put(ifa); 4506 errout: 4507 return err; 4508 } 4509 4510 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa) 4511 { 4512 struct sk_buff *skb; 4513 struct net *net = dev_net(ifa->idev->dev); 4514 int err = -ENOBUFS; 4515 4516 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC); 4517 if (skb == NULL) 4518 goto errout; 4519 4520 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0); 4521 if (err < 0) { 4522 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 4523 WARN_ON(err == -EMSGSIZE); 4524 kfree_skb(skb); 4525 goto errout; 4526 } 4527 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC); 4528 return; 4529 errout: 4530 if (err < 0) 4531 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err); 4532 } 4533 4534 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf, 4535 __s32 *array, int bytes) 4536 { 4537 BUG_ON(bytes < (DEVCONF_MAX * 4)); 4538 4539 memset(array, 0, bytes); 4540 array[DEVCONF_FORWARDING] = cnf->forwarding; 4541 array[DEVCONF_HOPLIMIT] = cnf->hop_limit; 4542 array[DEVCONF_MTU6] = cnf->mtu6; 4543 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra; 4544 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects; 4545 array[DEVCONF_AUTOCONF] = cnf->autoconf; 4546 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits; 4547 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits; 4548 array[DEVCONF_RTR_SOLICIT_INTERVAL] = 4549 jiffies_to_msecs(cnf->rtr_solicit_interval); 4550 array[DEVCONF_RTR_SOLICIT_DELAY] = 4551 jiffies_to_msecs(cnf->rtr_solicit_delay); 4552 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version; 4553 array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] = 4554 jiffies_to_msecs(cnf->mldv1_unsolicited_report_interval); 4555 array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] = 4556 jiffies_to_msecs(cnf->mldv2_unsolicited_report_interval); 4557 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr; 4558 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft; 4559 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft; 4560 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry; 4561 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor; 4562 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses; 4563 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr; 4564 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo; 4565 #ifdef CONFIG_IPV6_ROUTER_PREF 4566 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref; 4567 array[DEVCONF_RTR_PROBE_INTERVAL] = 4568 jiffies_to_msecs(cnf->rtr_probe_interval); 4569 #ifdef CONFIG_IPV6_ROUTE_INFO 4570 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen; 4571 #endif 4572 #endif 4573 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp; 4574 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route; 4575 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 4576 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad; 4577 array[DEVCONF_USE_OPTIMISTIC] = cnf->use_optimistic; 4578 #endif 4579 #ifdef CONFIG_IPV6_MROUTE 4580 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding; 4581 #endif 4582 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6; 4583 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad; 4584 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao; 4585 array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify; 4586 array[DEVCONF_SUPPRESS_FRAG_NDISC] = cnf->suppress_frag_ndisc; 4587 array[DEVCONF_ACCEPT_RA_FROM_LOCAL] = cnf->accept_ra_from_local; 4588 array[DEVCONF_ACCEPT_RA_MTU] = cnf->accept_ra_mtu; 4589 /* we omit DEVCONF_STABLE_SECRET for now */ 4590 } 4591 4592 static inline size_t inet6_ifla6_size(void) 4593 { 4594 return nla_total_size(4) /* IFLA_INET6_FLAGS */ 4595 + nla_total_size(sizeof(struct ifla_cacheinfo)) 4596 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */ 4597 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */ 4598 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */ 4599 + nla_total_size(sizeof(struct in6_addr)); /* IFLA_INET6_TOKEN */ 4600 } 4601 4602 static inline size_t inet6_if_nlmsg_size(void) 4603 { 4604 return NLMSG_ALIGN(sizeof(struct ifinfomsg)) 4605 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */ 4606 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */ 4607 + nla_total_size(4) /* IFLA_MTU */ 4608 + nla_total_size(4) /* IFLA_LINK */ 4609 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */ 4610 } 4611 4612 static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib, 4613 int items, int bytes) 4614 { 4615 int i; 4616 int pad = bytes - sizeof(u64) * items; 4617 BUG_ON(pad < 0); 4618 4619 /* Use put_unaligned() because stats may not be aligned for u64. */ 4620 put_unaligned(items, &stats[0]); 4621 for (i = 1; i < items; i++) 4622 put_unaligned(atomic_long_read(&mib[i]), &stats[i]); 4623 4624 memset(&stats[items], 0, pad); 4625 } 4626 4627 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu *mib, 4628 int items, int bytes, size_t syncpoff) 4629 { 4630 int i; 4631 int pad = bytes - sizeof(u64) * items; 4632 BUG_ON(pad < 0); 4633 4634 /* Use put_unaligned() because stats may not be aligned for u64. */ 4635 put_unaligned(items, &stats[0]); 4636 for (i = 1; i < items; i++) 4637 put_unaligned(snmp_fold_field64(mib, i, syncpoff), &stats[i]); 4638 4639 memset(&stats[items], 0, pad); 4640 } 4641 4642 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype, 4643 int bytes) 4644 { 4645 switch (attrtype) { 4646 case IFLA_INET6_STATS: 4647 __snmp6_fill_stats64(stats, idev->stats.ipv6, 4648 IPSTATS_MIB_MAX, bytes, offsetof(struct ipstats_mib, syncp)); 4649 break; 4650 case IFLA_INET6_ICMP6STATS: 4651 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, ICMP6_MIB_MAX, bytes); 4652 break; 4653 } 4654 } 4655 4656 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev) 4657 { 4658 struct nlattr *nla; 4659 struct ifla_cacheinfo ci; 4660 4661 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags)) 4662 goto nla_put_failure; 4663 ci.max_reasm_len = IPV6_MAXPLEN; 4664 ci.tstamp = cstamp_delta(idev->tstamp); 4665 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time); 4666 ci.retrans_time = jiffies_to_msecs(NEIGH_VAR(idev->nd_parms, RETRANS_TIME)); 4667 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci)) 4668 goto nla_put_failure; 4669 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32)); 4670 if (nla == NULL) 4671 goto nla_put_failure; 4672 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla)); 4673 4674 /* XXX - MC not implemented */ 4675 4676 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64)); 4677 if (nla == NULL) 4678 goto nla_put_failure; 4679 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla)); 4680 4681 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64)); 4682 if (nla == NULL) 4683 goto nla_put_failure; 4684 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla)); 4685 4686 nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr)); 4687 if (nla == NULL) 4688 goto nla_put_failure; 4689 4690 if (nla_put_u8(skb, IFLA_INET6_ADDR_GEN_MODE, idev->addr_gen_mode)) 4691 goto nla_put_failure; 4692 4693 read_lock_bh(&idev->lock); 4694 memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla)); 4695 read_unlock_bh(&idev->lock); 4696 4697 return 0; 4698 4699 nla_put_failure: 4700 return -EMSGSIZE; 4701 } 4702 4703 static size_t inet6_get_link_af_size(const struct net_device *dev) 4704 { 4705 if (!__in6_dev_get(dev)) 4706 return 0; 4707 4708 return inet6_ifla6_size(); 4709 } 4710 4711 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev) 4712 { 4713 struct inet6_dev *idev = __in6_dev_get(dev); 4714 4715 if (!idev) 4716 return -ENODATA; 4717 4718 if (inet6_fill_ifla6_attrs(skb, idev) < 0) 4719 return -EMSGSIZE; 4720 4721 return 0; 4722 } 4723 4724 static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token) 4725 { 4726 struct inet6_ifaddr *ifp; 4727 struct net_device *dev = idev->dev; 4728 bool update_rs = false; 4729 struct in6_addr ll_addr; 4730 4731 ASSERT_RTNL(); 4732 4733 if (token == NULL) 4734 return -EINVAL; 4735 if (ipv6_addr_any(token)) 4736 return -EINVAL; 4737 if (dev->flags & (IFF_LOOPBACK | IFF_NOARP)) 4738 return -EINVAL; 4739 if (!ipv6_accept_ra(idev)) 4740 return -EINVAL; 4741 if (idev->cnf.rtr_solicits <= 0) 4742 return -EINVAL; 4743 4744 write_lock_bh(&idev->lock); 4745 4746 BUILD_BUG_ON(sizeof(token->s6_addr) != 16); 4747 memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8); 4748 4749 write_unlock_bh(&idev->lock); 4750 4751 if (!idev->dead && (idev->if_flags & IF_READY) && 4752 !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE | 4753 IFA_F_OPTIMISTIC)) { 4754 4755 /* If we're not ready, then normal ifup will take care 4756 * of this. Otherwise, we need to request our rs here. 4757 */ 4758 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters); 4759 update_rs = true; 4760 } 4761 4762 write_lock_bh(&idev->lock); 4763 4764 if (update_rs) { 4765 idev->if_flags |= IF_RS_SENT; 4766 idev->rs_probes = 1; 4767 addrconf_mod_rs_timer(idev, idev->cnf.rtr_solicit_interval); 4768 } 4769 4770 /* Well, that's kinda nasty ... */ 4771 list_for_each_entry(ifp, &idev->addr_list, if_list) { 4772 spin_lock(&ifp->lock); 4773 if (ifp->tokenized) { 4774 ifp->valid_lft = 0; 4775 ifp->prefered_lft = 0; 4776 } 4777 spin_unlock(&ifp->lock); 4778 } 4779 4780 write_unlock_bh(&idev->lock); 4781 inet6_ifinfo_notify(RTM_NEWLINK, idev); 4782 addrconf_verify_rtnl(); 4783 return 0; 4784 } 4785 4786 static const struct nla_policy inet6_af_policy[IFLA_INET6_MAX + 1] = { 4787 [IFLA_INET6_ADDR_GEN_MODE] = { .type = NLA_U8 }, 4788 [IFLA_INET6_TOKEN] = { .len = sizeof(struct in6_addr) }, 4789 }; 4790 4791 static int inet6_validate_link_af(const struct net_device *dev, 4792 const struct nlattr *nla) 4793 { 4794 struct nlattr *tb[IFLA_INET6_MAX + 1]; 4795 4796 if (dev && !__in6_dev_get(dev)) 4797 return -EAFNOSUPPORT; 4798 4799 return nla_parse_nested(tb, IFLA_INET6_MAX, nla, inet6_af_policy); 4800 } 4801 4802 static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla) 4803 { 4804 int err = -EINVAL; 4805 struct inet6_dev *idev = __in6_dev_get(dev); 4806 struct nlattr *tb[IFLA_INET6_MAX + 1]; 4807 4808 if (!idev) 4809 return -EAFNOSUPPORT; 4810 4811 if (nla_parse_nested(tb, IFLA_INET6_MAX, nla, NULL) < 0) 4812 BUG(); 4813 4814 if (tb[IFLA_INET6_TOKEN]) { 4815 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN])); 4816 if (err) 4817 return err; 4818 } 4819 4820 if (tb[IFLA_INET6_ADDR_GEN_MODE]) { 4821 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]); 4822 4823 if (mode != IN6_ADDR_GEN_MODE_EUI64 && 4824 mode != IN6_ADDR_GEN_MODE_NONE && 4825 mode != IN6_ADDR_GEN_MODE_STABLE_PRIVACY) 4826 return -EINVAL; 4827 4828 if (mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY && 4829 !idev->cnf.stable_secret.initialized && 4830 !dev_net(dev)->ipv6.devconf_dflt->stable_secret.initialized) 4831 return -EINVAL; 4832 4833 idev->addr_gen_mode = mode; 4834 err = 0; 4835 } 4836 4837 return err; 4838 } 4839 4840 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev, 4841 u32 portid, u32 seq, int event, unsigned int flags) 4842 { 4843 struct net_device *dev = idev->dev; 4844 struct ifinfomsg *hdr; 4845 struct nlmsghdr *nlh; 4846 void *protoinfo; 4847 4848 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags); 4849 if (nlh == NULL) 4850 return -EMSGSIZE; 4851 4852 hdr = nlmsg_data(nlh); 4853 hdr->ifi_family = AF_INET6; 4854 hdr->__ifi_pad = 0; 4855 hdr->ifi_type = dev->type; 4856 hdr->ifi_index = dev->ifindex; 4857 hdr->ifi_flags = dev_get_flags(dev); 4858 hdr->ifi_change = 0; 4859 4860 if (nla_put_string(skb, IFLA_IFNAME, dev->name) || 4861 (dev->addr_len && 4862 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) || 4863 nla_put_u32(skb, IFLA_MTU, dev->mtu) || 4864 (dev->ifindex != dev->iflink && 4865 nla_put_u32(skb, IFLA_LINK, dev->iflink))) 4866 goto nla_put_failure; 4867 protoinfo = nla_nest_start(skb, IFLA_PROTINFO); 4868 if (protoinfo == NULL) 4869 goto nla_put_failure; 4870 4871 if (inet6_fill_ifla6_attrs(skb, idev) < 0) 4872 goto nla_put_failure; 4873 4874 nla_nest_end(skb, protoinfo); 4875 nlmsg_end(skb, nlh); 4876 return 0; 4877 4878 nla_put_failure: 4879 nlmsg_cancel(skb, nlh); 4880 return -EMSGSIZE; 4881 } 4882 4883 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb) 4884 { 4885 struct net *net = sock_net(skb->sk); 4886 int h, s_h; 4887 int idx = 0, s_idx; 4888 struct net_device *dev; 4889 struct inet6_dev *idev; 4890 struct hlist_head *head; 4891 4892 s_h = cb->args[0]; 4893 s_idx = cb->args[1]; 4894 4895 rcu_read_lock(); 4896 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 4897 idx = 0; 4898 head = &net->dev_index_head[h]; 4899 hlist_for_each_entry_rcu(dev, head, index_hlist) { 4900 if (idx < s_idx) 4901 goto cont; 4902 idev = __in6_dev_get(dev); 4903 if (!idev) 4904 goto cont; 4905 if (inet6_fill_ifinfo(skb, idev, 4906 NETLINK_CB(cb->skb).portid, 4907 cb->nlh->nlmsg_seq, 4908 RTM_NEWLINK, NLM_F_MULTI) < 0) 4909 goto out; 4910 cont: 4911 idx++; 4912 } 4913 } 4914 out: 4915 rcu_read_unlock(); 4916 cb->args[1] = idx; 4917 cb->args[0] = h; 4918 4919 return skb->len; 4920 } 4921 4922 void inet6_ifinfo_notify(int event, struct inet6_dev *idev) 4923 { 4924 struct sk_buff *skb; 4925 struct net *net = dev_net(idev->dev); 4926 int err = -ENOBUFS; 4927 4928 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC); 4929 if (skb == NULL) 4930 goto errout; 4931 4932 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0); 4933 if (err < 0) { 4934 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */ 4935 WARN_ON(err == -EMSGSIZE); 4936 kfree_skb(skb); 4937 goto errout; 4938 } 4939 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC); 4940 return; 4941 errout: 4942 if (err < 0) 4943 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err); 4944 } 4945 4946 static inline size_t inet6_prefix_nlmsg_size(void) 4947 { 4948 return NLMSG_ALIGN(sizeof(struct prefixmsg)) 4949 + nla_total_size(sizeof(struct in6_addr)) 4950 + nla_total_size(sizeof(struct prefix_cacheinfo)); 4951 } 4952 4953 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev, 4954 struct prefix_info *pinfo, u32 portid, u32 seq, 4955 int event, unsigned int flags) 4956 { 4957 struct prefixmsg *pmsg; 4958 struct nlmsghdr *nlh; 4959 struct prefix_cacheinfo ci; 4960 4961 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags); 4962 if (nlh == NULL) 4963 return -EMSGSIZE; 4964 4965 pmsg = nlmsg_data(nlh); 4966 pmsg->prefix_family = AF_INET6; 4967 pmsg->prefix_pad1 = 0; 4968 pmsg->prefix_pad2 = 0; 4969 pmsg->prefix_ifindex = idev->dev->ifindex; 4970 pmsg->prefix_len = pinfo->prefix_len; 4971 pmsg->prefix_type = pinfo->type; 4972 pmsg->prefix_pad3 = 0; 4973 pmsg->prefix_flags = 0; 4974 if (pinfo->onlink) 4975 pmsg->prefix_flags |= IF_PREFIX_ONLINK; 4976 if (pinfo->autoconf) 4977 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF; 4978 4979 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix)) 4980 goto nla_put_failure; 4981 ci.preferred_time = ntohl(pinfo->prefered); 4982 ci.valid_time = ntohl(pinfo->valid); 4983 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci)) 4984 goto nla_put_failure; 4985 nlmsg_end(skb, nlh); 4986 return 0; 4987 4988 nla_put_failure: 4989 nlmsg_cancel(skb, nlh); 4990 return -EMSGSIZE; 4991 } 4992 4993 static void inet6_prefix_notify(int event, struct inet6_dev *idev, 4994 struct prefix_info *pinfo) 4995 { 4996 struct sk_buff *skb; 4997 struct net *net = dev_net(idev->dev); 4998 int err = -ENOBUFS; 4999 5000 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC); 5001 if (skb == NULL) 5002 goto errout; 5003 5004 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0); 5005 if (err < 0) { 5006 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */ 5007 WARN_ON(err == -EMSGSIZE); 5008 kfree_skb(skb); 5009 goto errout; 5010 } 5011 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC); 5012 return; 5013 errout: 5014 if (err < 0) 5015 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err); 5016 } 5017 5018 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 5019 { 5020 struct net *net = dev_net(ifp->idev->dev); 5021 5022 if (event) 5023 ASSERT_RTNL(); 5024 5025 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp); 5026 5027 switch (event) { 5028 case RTM_NEWADDR: 5029 /* 5030 * If the address was optimistic 5031 * we inserted the route at the start of 5032 * our DAD process, so we don't need 5033 * to do it again 5034 */ 5035 if (!(ifp->rt->rt6i_node)) 5036 ip6_ins_rt(ifp->rt); 5037 if (ifp->idev->cnf.forwarding) 5038 addrconf_join_anycast(ifp); 5039 if (!ipv6_addr_any(&ifp->peer_addr)) 5040 addrconf_prefix_route(&ifp->peer_addr, 128, 5041 ifp->idev->dev, 0, 0); 5042 break; 5043 case RTM_DELADDR: 5044 if (ifp->idev->cnf.forwarding) 5045 addrconf_leave_anycast(ifp); 5046 addrconf_leave_solict(ifp->idev, &ifp->addr); 5047 if (!ipv6_addr_any(&ifp->peer_addr)) { 5048 struct rt6_info *rt; 5049 5050 rt = addrconf_get_prefix_route(&ifp->peer_addr, 128, 5051 ifp->idev->dev, 0, 0); 5052 if (rt && ip6_del_rt(rt)) 5053 dst_free(&rt->dst); 5054 } 5055 dst_hold(&ifp->rt->dst); 5056 5057 if (ip6_del_rt(ifp->rt)) 5058 dst_free(&ifp->rt->dst); 5059 5060 rt_genid_bump_ipv6(net); 5061 break; 5062 } 5063 atomic_inc(&net->ipv6.dev_addr_genid); 5064 } 5065 5066 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 5067 { 5068 rcu_read_lock_bh(); 5069 if (likely(ifp->idev->dead == 0)) 5070 __ipv6_ifa_notify(event, ifp); 5071 rcu_read_unlock_bh(); 5072 } 5073 5074 #ifdef CONFIG_SYSCTL 5075 5076 static 5077 int addrconf_sysctl_forward(struct ctl_table *ctl, int write, 5078 void __user *buffer, size_t *lenp, loff_t *ppos) 5079 { 5080 int *valp = ctl->data; 5081 int val = *valp; 5082 loff_t pos = *ppos; 5083 struct ctl_table lctl; 5084 int ret; 5085 5086 /* 5087 * ctl->data points to idev->cnf.forwarding, we should 5088 * not modify it until we get the rtnl lock. 5089 */ 5090 lctl = *ctl; 5091 lctl.data = &val; 5092 5093 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 5094 5095 if (write) 5096 ret = addrconf_fixup_forwarding(ctl, valp, val); 5097 if (ret) 5098 *ppos = pos; 5099 return ret; 5100 } 5101 5102 static 5103 int addrconf_sysctl_mtu(struct ctl_table *ctl, int write, 5104 void __user *buffer, size_t *lenp, loff_t *ppos) 5105 { 5106 struct inet6_dev *idev = ctl->extra1; 5107 int min_mtu = IPV6_MIN_MTU; 5108 struct ctl_table lctl; 5109 5110 lctl = *ctl; 5111 lctl.extra1 = &min_mtu; 5112 lctl.extra2 = idev ? &idev->dev->mtu : NULL; 5113 5114 return proc_dointvec_minmax(&lctl, write, buffer, lenp, ppos); 5115 } 5116 5117 static void dev_disable_change(struct inet6_dev *idev) 5118 { 5119 struct netdev_notifier_info info; 5120 5121 if (!idev || !idev->dev) 5122 return; 5123 5124 netdev_notifier_info_init(&info, idev->dev); 5125 if (idev->cnf.disable_ipv6) 5126 addrconf_notify(NULL, NETDEV_DOWN, &info); 5127 else 5128 addrconf_notify(NULL, NETDEV_UP, &info); 5129 } 5130 5131 static void addrconf_disable_change(struct net *net, __s32 newf) 5132 { 5133 struct net_device *dev; 5134 struct inet6_dev *idev; 5135 5136 rcu_read_lock(); 5137 for_each_netdev_rcu(net, dev) { 5138 idev = __in6_dev_get(dev); 5139 if (idev) { 5140 int changed = (!idev->cnf.disable_ipv6) ^ (!newf); 5141 idev->cnf.disable_ipv6 = newf; 5142 if (changed) 5143 dev_disable_change(idev); 5144 } 5145 } 5146 rcu_read_unlock(); 5147 } 5148 5149 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf) 5150 { 5151 struct net *net; 5152 int old; 5153 5154 if (!rtnl_trylock()) 5155 return restart_syscall(); 5156 5157 net = (struct net *)table->extra2; 5158 old = *p; 5159 *p = newf; 5160 5161 if (p == &net->ipv6.devconf_dflt->disable_ipv6) { 5162 rtnl_unlock(); 5163 return 0; 5164 } 5165 5166 if (p == &net->ipv6.devconf_all->disable_ipv6) { 5167 net->ipv6.devconf_dflt->disable_ipv6 = newf; 5168 addrconf_disable_change(net, newf); 5169 } else if ((!newf) ^ (!old)) 5170 dev_disable_change((struct inet6_dev *)table->extra1); 5171 5172 rtnl_unlock(); 5173 return 0; 5174 } 5175 5176 static 5177 int addrconf_sysctl_disable(struct ctl_table *ctl, int write, 5178 void __user *buffer, size_t *lenp, loff_t *ppos) 5179 { 5180 int *valp = ctl->data; 5181 int val = *valp; 5182 loff_t pos = *ppos; 5183 struct ctl_table lctl; 5184 int ret; 5185 5186 /* 5187 * ctl->data points to idev->cnf.disable_ipv6, we should 5188 * not modify it until we get the rtnl lock. 5189 */ 5190 lctl = *ctl; 5191 lctl.data = &val; 5192 5193 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 5194 5195 if (write) 5196 ret = addrconf_disable_ipv6(ctl, valp, val); 5197 if (ret) 5198 *ppos = pos; 5199 return ret; 5200 } 5201 5202 static 5203 int addrconf_sysctl_proxy_ndp(struct ctl_table *ctl, int write, 5204 void __user *buffer, size_t *lenp, loff_t *ppos) 5205 { 5206 int *valp = ctl->data; 5207 int ret; 5208 int old, new; 5209 5210 old = *valp; 5211 ret = proc_dointvec(ctl, write, buffer, lenp, ppos); 5212 new = *valp; 5213 5214 if (write && old != new) { 5215 struct net *net = ctl->extra2; 5216 5217 if (!rtnl_trylock()) 5218 return restart_syscall(); 5219 5220 if (valp == &net->ipv6.devconf_dflt->proxy_ndp) 5221 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH, 5222 NETCONFA_IFINDEX_DEFAULT, 5223 net->ipv6.devconf_dflt); 5224 else if (valp == &net->ipv6.devconf_all->proxy_ndp) 5225 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH, 5226 NETCONFA_IFINDEX_ALL, 5227 net->ipv6.devconf_all); 5228 else { 5229 struct inet6_dev *idev = ctl->extra1; 5230 5231 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH, 5232 idev->dev->ifindex, 5233 &idev->cnf); 5234 } 5235 rtnl_unlock(); 5236 } 5237 5238 return ret; 5239 } 5240 5241 static int addrconf_sysctl_stable_secret(struct ctl_table *ctl, int write, 5242 void __user *buffer, size_t *lenp, 5243 loff_t *ppos) 5244 { 5245 int err; 5246 struct in6_addr addr; 5247 char str[IPV6_MAX_STRLEN]; 5248 struct ctl_table lctl = *ctl; 5249 struct net *net = ctl->extra2; 5250 struct ipv6_stable_secret *secret = ctl->data; 5251 5252 if (&net->ipv6.devconf_all->stable_secret == ctl->data) 5253 return -EIO; 5254 5255 lctl.maxlen = IPV6_MAX_STRLEN; 5256 lctl.data = str; 5257 5258 if (!rtnl_trylock()) 5259 return restart_syscall(); 5260 5261 if (!write && !secret->initialized) { 5262 err = -EIO; 5263 goto out; 5264 } 5265 5266 if (!write) { 5267 err = snprintf(str, sizeof(str), "%pI6", 5268 &secret->secret); 5269 if (err >= sizeof(str)) { 5270 err = -EIO; 5271 goto out; 5272 } 5273 } 5274 5275 err = proc_dostring(&lctl, write, buffer, lenp, ppos); 5276 if (err || !write) 5277 goto out; 5278 5279 if (in6_pton(str, -1, addr.in6_u.u6_addr8, -1, NULL) != 1) { 5280 err = -EIO; 5281 goto out; 5282 } 5283 5284 secret->initialized = true; 5285 secret->secret = addr; 5286 5287 if (&net->ipv6.devconf_dflt->stable_secret == ctl->data) { 5288 struct net_device *dev; 5289 5290 for_each_netdev(net, dev) { 5291 struct inet6_dev *idev = __in6_dev_get(dev); 5292 5293 if (idev) { 5294 idev->addr_gen_mode = 5295 IN6_ADDR_GEN_MODE_STABLE_PRIVACY; 5296 } 5297 } 5298 } else { 5299 struct inet6_dev *idev = ctl->extra1; 5300 5301 idev->addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY; 5302 } 5303 5304 out: 5305 rtnl_unlock(); 5306 5307 return err; 5308 } 5309 5310 static struct addrconf_sysctl_table 5311 { 5312 struct ctl_table_header *sysctl_header; 5313 struct ctl_table addrconf_vars[DEVCONF_MAX+1]; 5314 } addrconf_sysctl __read_mostly = { 5315 .sysctl_header = NULL, 5316 .addrconf_vars = { 5317 { 5318 .procname = "forwarding", 5319 .data = &ipv6_devconf.forwarding, 5320 .maxlen = sizeof(int), 5321 .mode = 0644, 5322 .proc_handler = addrconf_sysctl_forward, 5323 }, 5324 { 5325 .procname = "hop_limit", 5326 .data = &ipv6_devconf.hop_limit, 5327 .maxlen = sizeof(int), 5328 .mode = 0644, 5329 .proc_handler = proc_dointvec, 5330 }, 5331 { 5332 .procname = "mtu", 5333 .data = &ipv6_devconf.mtu6, 5334 .maxlen = sizeof(int), 5335 .mode = 0644, 5336 .proc_handler = addrconf_sysctl_mtu, 5337 }, 5338 { 5339 .procname = "accept_ra", 5340 .data = &ipv6_devconf.accept_ra, 5341 .maxlen = sizeof(int), 5342 .mode = 0644, 5343 .proc_handler = proc_dointvec, 5344 }, 5345 { 5346 .procname = "accept_redirects", 5347 .data = &ipv6_devconf.accept_redirects, 5348 .maxlen = sizeof(int), 5349 .mode = 0644, 5350 .proc_handler = proc_dointvec, 5351 }, 5352 { 5353 .procname = "autoconf", 5354 .data = &ipv6_devconf.autoconf, 5355 .maxlen = sizeof(int), 5356 .mode = 0644, 5357 .proc_handler = proc_dointvec, 5358 }, 5359 { 5360 .procname = "dad_transmits", 5361 .data = &ipv6_devconf.dad_transmits, 5362 .maxlen = sizeof(int), 5363 .mode = 0644, 5364 .proc_handler = proc_dointvec, 5365 }, 5366 { 5367 .procname = "router_solicitations", 5368 .data = &ipv6_devconf.rtr_solicits, 5369 .maxlen = sizeof(int), 5370 .mode = 0644, 5371 .proc_handler = proc_dointvec, 5372 }, 5373 { 5374 .procname = "router_solicitation_interval", 5375 .data = &ipv6_devconf.rtr_solicit_interval, 5376 .maxlen = sizeof(int), 5377 .mode = 0644, 5378 .proc_handler = proc_dointvec_jiffies, 5379 }, 5380 { 5381 .procname = "router_solicitation_delay", 5382 .data = &ipv6_devconf.rtr_solicit_delay, 5383 .maxlen = sizeof(int), 5384 .mode = 0644, 5385 .proc_handler = proc_dointvec_jiffies, 5386 }, 5387 { 5388 .procname = "force_mld_version", 5389 .data = &ipv6_devconf.force_mld_version, 5390 .maxlen = sizeof(int), 5391 .mode = 0644, 5392 .proc_handler = proc_dointvec, 5393 }, 5394 { 5395 .procname = "mldv1_unsolicited_report_interval", 5396 .data = 5397 &ipv6_devconf.mldv1_unsolicited_report_interval, 5398 .maxlen = sizeof(int), 5399 .mode = 0644, 5400 .proc_handler = proc_dointvec_ms_jiffies, 5401 }, 5402 { 5403 .procname = "mldv2_unsolicited_report_interval", 5404 .data = 5405 &ipv6_devconf.mldv2_unsolicited_report_interval, 5406 .maxlen = sizeof(int), 5407 .mode = 0644, 5408 .proc_handler = proc_dointvec_ms_jiffies, 5409 }, 5410 { 5411 .procname = "use_tempaddr", 5412 .data = &ipv6_devconf.use_tempaddr, 5413 .maxlen = sizeof(int), 5414 .mode = 0644, 5415 .proc_handler = proc_dointvec, 5416 }, 5417 { 5418 .procname = "temp_valid_lft", 5419 .data = &ipv6_devconf.temp_valid_lft, 5420 .maxlen = sizeof(int), 5421 .mode = 0644, 5422 .proc_handler = proc_dointvec, 5423 }, 5424 { 5425 .procname = "temp_prefered_lft", 5426 .data = &ipv6_devconf.temp_prefered_lft, 5427 .maxlen = sizeof(int), 5428 .mode = 0644, 5429 .proc_handler = proc_dointvec, 5430 }, 5431 { 5432 .procname = "regen_max_retry", 5433 .data = &ipv6_devconf.regen_max_retry, 5434 .maxlen = sizeof(int), 5435 .mode = 0644, 5436 .proc_handler = proc_dointvec, 5437 }, 5438 { 5439 .procname = "max_desync_factor", 5440 .data = &ipv6_devconf.max_desync_factor, 5441 .maxlen = sizeof(int), 5442 .mode = 0644, 5443 .proc_handler = proc_dointvec, 5444 }, 5445 { 5446 .procname = "max_addresses", 5447 .data = &ipv6_devconf.max_addresses, 5448 .maxlen = sizeof(int), 5449 .mode = 0644, 5450 .proc_handler = proc_dointvec, 5451 }, 5452 { 5453 .procname = "accept_ra_defrtr", 5454 .data = &ipv6_devconf.accept_ra_defrtr, 5455 .maxlen = sizeof(int), 5456 .mode = 0644, 5457 .proc_handler = proc_dointvec, 5458 }, 5459 { 5460 .procname = "accept_ra_pinfo", 5461 .data = &ipv6_devconf.accept_ra_pinfo, 5462 .maxlen = sizeof(int), 5463 .mode = 0644, 5464 .proc_handler = proc_dointvec, 5465 }, 5466 #ifdef CONFIG_IPV6_ROUTER_PREF 5467 { 5468 .procname = "accept_ra_rtr_pref", 5469 .data = &ipv6_devconf.accept_ra_rtr_pref, 5470 .maxlen = sizeof(int), 5471 .mode = 0644, 5472 .proc_handler = proc_dointvec, 5473 }, 5474 { 5475 .procname = "router_probe_interval", 5476 .data = &ipv6_devconf.rtr_probe_interval, 5477 .maxlen = sizeof(int), 5478 .mode = 0644, 5479 .proc_handler = proc_dointvec_jiffies, 5480 }, 5481 #ifdef CONFIG_IPV6_ROUTE_INFO 5482 { 5483 .procname = "accept_ra_rt_info_max_plen", 5484 .data = &ipv6_devconf.accept_ra_rt_info_max_plen, 5485 .maxlen = sizeof(int), 5486 .mode = 0644, 5487 .proc_handler = proc_dointvec, 5488 }, 5489 #endif 5490 #endif 5491 { 5492 .procname = "proxy_ndp", 5493 .data = &ipv6_devconf.proxy_ndp, 5494 .maxlen = sizeof(int), 5495 .mode = 0644, 5496 .proc_handler = addrconf_sysctl_proxy_ndp, 5497 }, 5498 { 5499 .procname = "accept_source_route", 5500 .data = &ipv6_devconf.accept_source_route, 5501 .maxlen = sizeof(int), 5502 .mode = 0644, 5503 .proc_handler = proc_dointvec, 5504 }, 5505 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 5506 { 5507 .procname = "optimistic_dad", 5508 .data = &ipv6_devconf.optimistic_dad, 5509 .maxlen = sizeof(int), 5510 .mode = 0644, 5511 .proc_handler = proc_dointvec, 5512 5513 }, 5514 { 5515 .procname = "use_optimistic", 5516 .data = &ipv6_devconf.use_optimistic, 5517 .maxlen = sizeof(int), 5518 .mode = 0644, 5519 .proc_handler = proc_dointvec, 5520 5521 }, 5522 #endif 5523 #ifdef CONFIG_IPV6_MROUTE 5524 { 5525 .procname = "mc_forwarding", 5526 .data = &ipv6_devconf.mc_forwarding, 5527 .maxlen = sizeof(int), 5528 .mode = 0444, 5529 .proc_handler = proc_dointvec, 5530 }, 5531 #endif 5532 { 5533 .procname = "disable_ipv6", 5534 .data = &ipv6_devconf.disable_ipv6, 5535 .maxlen = sizeof(int), 5536 .mode = 0644, 5537 .proc_handler = addrconf_sysctl_disable, 5538 }, 5539 { 5540 .procname = "accept_dad", 5541 .data = &ipv6_devconf.accept_dad, 5542 .maxlen = sizeof(int), 5543 .mode = 0644, 5544 .proc_handler = proc_dointvec, 5545 }, 5546 { 5547 .procname = "force_tllao", 5548 .data = &ipv6_devconf.force_tllao, 5549 .maxlen = sizeof(int), 5550 .mode = 0644, 5551 .proc_handler = proc_dointvec 5552 }, 5553 { 5554 .procname = "ndisc_notify", 5555 .data = &ipv6_devconf.ndisc_notify, 5556 .maxlen = sizeof(int), 5557 .mode = 0644, 5558 .proc_handler = proc_dointvec 5559 }, 5560 { 5561 .procname = "suppress_frag_ndisc", 5562 .data = &ipv6_devconf.suppress_frag_ndisc, 5563 .maxlen = sizeof(int), 5564 .mode = 0644, 5565 .proc_handler = proc_dointvec 5566 }, 5567 { 5568 .procname = "accept_ra_from_local", 5569 .data = &ipv6_devconf.accept_ra_from_local, 5570 .maxlen = sizeof(int), 5571 .mode = 0644, 5572 .proc_handler = proc_dointvec, 5573 }, 5574 { 5575 .procname = "accept_ra_mtu", 5576 .data = &ipv6_devconf.accept_ra_mtu, 5577 .maxlen = sizeof(int), 5578 .mode = 0644, 5579 .proc_handler = proc_dointvec, 5580 }, 5581 { 5582 .procname = "stable_secret", 5583 .data = &ipv6_devconf.stable_secret, 5584 .maxlen = IPV6_MAX_STRLEN, 5585 .mode = 0600, 5586 .proc_handler = addrconf_sysctl_stable_secret, 5587 }, 5588 { 5589 /* sentinel */ 5590 } 5591 }, 5592 }; 5593 5594 static int __addrconf_sysctl_register(struct net *net, char *dev_name, 5595 struct inet6_dev *idev, struct ipv6_devconf *p) 5596 { 5597 int i; 5598 struct addrconf_sysctl_table *t; 5599 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ]; 5600 5601 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL); 5602 if (t == NULL) 5603 goto out; 5604 5605 for (i = 0; t->addrconf_vars[i].data; i++) { 5606 t->addrconf_vars[i].data += (char *)p - (char *)&ipv6_devconf; 5607 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */ 5608 t->addrconf_vars[i].extra2 = net; 5609 } 5610 5611 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name); 5612 5613 t->sysctl_header = register_net_sysctl(net, path, t->addrconf_vars); 5614 if (t->sysctl_header == NULL) 5615 goto free; 5616 5617 p->sysctl = t; 5618 return 0; 5619 5620 free: 5621 kfree(t); 5622 out: 5623 return -ENOBUFS; 5624 } 5625 5626 static void __addrconf_sysctl_unregister(struct ipv6_devconf *p) 5627 { 5628 struct addrconf_sysctl_table *t; 5629 5630 if (p->sysctl == NULL) 5631 return; 5632 5633 t = p->sysctl; 5634 p->sysctl = NULL; 5635 unregister_net_sysctl_table(t->sysctl_header); 5636 kfree(t); 5637 } 5638 5639 static int addrconf_sysctl_register(struct inet6_dev *idev) 5640 { 5641 int err; 5642 5643 if (!sysctl_dev_name_is_allowed(idev->dev->name)) 5644 return -EINVAL; 5645 5646 err = neigh_sysctl_register(idev->dev, idev->nd_parms, 5647 &ndisc_ifinfo_sysctl_change); 5648 if (err) 5649 return err; 5650 err = __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name, 5651 idev, &idev->cnf); 5652 if (err) 5653 neigh_sysctl_unregister(idev->nd_parms); 5654 5655 return err; 5656 } 5657 5658 static void addrconf_sysctl_unregister(struct inet6_dev *idev) 5659 { 5660 __addrconf_sysctl_unregister(&idev->cnf); 5661 neigh_sysctl_unregister(idev->nd_parms); 5662 } 5663 5664 5665 #endif 5666 5667 static int __net_init addrconf_init_net(struct net *net) 5668 { 5669 int err = -ENOMEM; 5670 struct ipv6_devconf *all, *dflt; 5671 5672 all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL); 5673 if (all == NULL) 5674 goto err_alloc_all; 5675 5676 dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL); 5677 if (dflt == NULL) 5678 goto err_alloc_dflt; 5679 5680 /* these will be inherited by all namespaces */ 5681 dflt->autoconf = ipv6_defaults.autoconf; 5682 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6; 5683 5684 dflt->stable_secret.initialized = false; 5685 all->stable_secret.initialized = false; 5686 5687 net->ipv6.devconf_all = all; 5688 net->ipv6.devconf_dflt = dflt; 5689 5690 #ifdef CONFIG_SYSCTL 5691 err = __addrconf_sysctl_register(net, "all", NULL, all); 5692 if (err < 0) 5693 goto err_reg_all; 5694 5695 err = __addrconf_sysctl_register(net, "default", NULL, dflt); 5696 if (err < 0) 5697 goto err_reg_dflt; 5698 #endif 5699 return 0; 5700 5701 #ifdef CONFIG_SYSCTL 5702 err_reg_dflt: 5703 __addrconf_sysctl_unregister(all); 5704 err_reg_all: 5705 kfree(dflt); 5706 #endif 5707 err_alloc_dflt: 5708 kfree(all); 5709 err_alloc_all: 5710 return err; 5711 } 5712 5713 static void __net_exit addrconf_exit_net(struct net *net) 5714 { 5715 #ifdef CONFIG_SYSCTL 5716 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt); 5717 __addrconf_sysctl_unregister(net->ipv6.devconf_all); 5718 #endif 5719 kfree(net->ipv6.devconf_dflt); 5720 kfree(net->ipv6.devconf_all); 5721 } 5722 5723 static struct pernet_operations addrconf_ops = { 5724 .init = addrconf_init_net, 5725 .exit = addrconf_exit_net, 5726 }; 5727 5728 static struct rtnl_af_ops inet6_ops __read_mostly = { 5729 .family = AF_INET6, 5730 .fill_link_af = inet6_fill_link_af, 5731 .get_link_af_size = inet6_get_link_af_size, 5732 .validate_link_af = inet6_validate_link_af, 5733 .set_link_af = inet6_set_link_af, 5734 }; 5735 5736 /* 5737 * Init / cleanup code 5738 */ 5739 5740 int __init addrconf_init(void) 5741 { 5742 struct inet6_dev *idev; 5743 int i, err; 5744 5745 err = ipv6_addr_label_init(); 5746 if (err < 0) { 5747 pr_crit("%s: cannot initialize default policy table: %d\n", 5748 __func__, err); 5749 goto out; 5750 } 5751 5752 err = register_pernet_subsys(&addrconf_ops); 5753 if (err < 0) 5754 goto out_addrlabel; 5755 5756 addrconf_wq = create_workqueue("ipv6_addrconf"); 5757 if (!addrconf_wq) { 5758 err = -ENOMEM; 5759 goto out_nowq; 5760 } 5761 5762 /* The addrconf netdev notifier requires that loopback_dev 5763 * has it's ipv6 private information allocated and setup 5764 * before it can bring up and give link-local addresses 5765 * to other devices which are up. 5766 * 5767 * Unfortunately, loopback_dev is not necessarily the first 5768 * entry in the global dev_base list of net devices. In fact, 5769 * it is likely to be the very last entry on that list. 5770 * So this causes the notifier registry below to try and 5771 * give link-local addresses to all devices besides loopback_dev 5772 * first, then loopback_dev, which cases all the non-loopback_dev 5773 * devices to fail to get a link-local address. 5774 * 5775 * So, as a temporary fix, allocate the ipv6 structure for 5776 * loopback_dev first by hand. 5777 * Longer term, all of the dependencies ipv6 has upon the loopback 5778 * device and it being up should be removed. 5779 */ 5780 rtnl_lock(); 5781 idev = ipv6_add_dev(init_net.loopback_dev); 5782 rtnl_unlock(); 5783 if (IS_ERR(idev)) { 5784 err = PTR_ERR(idev); 5785 goto errlo; 5786 } 5787 5788 for (i = 0; i < IN6_ADDR_HSIZE; i++) 5789 INIT_HLIST_HEAD(&inet6_addr_lst[i]); 5790 5791 register_netdevice_notifier(&ipv6_dev_notf); 5792 5793 addrconf_verify(); 5794 5795 rtnl_af_register(&inet6_ops); 5796 5797 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo, 5798 NULL); 5799 if (err < 0) 5800 goto errout; 5801 5802 /* Only the first call to __rtnl_register can fail */ 5803 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL, NULL); 5804 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL, NULL); 5805 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr, 5806 inet6_dump_ifaddr, NULL); 5807 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL, 5808 inet6_dump_ifmcaddr, NULL); 5809 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL, 5810 inet6_dump_ifacaddr, NULL); 5811 __rtnl_register(PF_INET6, RTM_GETNETCONF, inet6_netconf_get_devconf, 5812 inet6_netconf_dump_devconf, NULL); 5813 5814 ipv6_addr_label_rtnl_register(); 5815 5816 return 0; 5817 errout: 5818 rtnl_af_unregister(&inet6_ops); 5819 unregister_netdevice_notifier(&ipv6_dev_notf); 5820 errlo: 5821 destroy_workqueue(addrconf_wq); 5822 out_nowq: 5823 unregister_pernet_subsys(&addrconf_ops); 5824 out_addrlabel: 5825 ipv6_addr_label_cleanup(); 5826 out: 5827 return err; 5828 } 5829 5830 void addrconf_cleanup(void) 5831 { 5832 struct net_device *dev; 5833 int i; 5834 5835 unregister_netdevice_notifier(&ipv6_dev_notf); 5836 unregister_pernet_subsys(&addrconf_ops); 5837 ipv6_addr_label_cleanup(); 5838 5839 rtnl_lock(); 5840 5841 __rtnl_af_unregister(&inet6_ops); 5842 5843 /* clean dev list */ 5844 for_each_netdev(&init_net, dev) { 5845 if (__in6_dev_get(dev) == NULL) 5846 continue; 5847 addrconf_ifdown(dev, 1); 5848 } 5849 addrconf_ifdown(init_net.loopback_dev, 2); 5850 5851 /* 5852 * Check hash table. 5853 */ 5854 spin_lock_bh(&addrconf_hash_lock); 5855 for (i = 0; i < IN6_ADDR_HSIZE; i++) 5856 WARN_ON(!hlist_empty(&inet6_addr_lst[i])); 5857 spin_unlock_bh(&addrconf_hash_lock); 5858 cancel_delayed_work(&addr_chk_work); 5859 rtnl_unlock(); 5860 5861 destroy_workqueue(addrconf_wq); 5862 } 5863