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