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