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 static int __ipv6_dev_get_saddr(struct net *net, 1362 struct ipv6_saddr_dst *dst, 1363 struct inet6_dev *idev, 1364 struct ipv6_saddr_score *scores, 1365 int hiscore_idx) 1366 { 1367 struct ipv6_saddr_score *score = &scores[1 - hiscore_idx], *hiscore = &scores[hiscore_idx]; 1368 1369 read_lock_bh(&idev->lock); 1370 list_for_each_entry(score->ifa, &idev->addr_list, if_list) { 1371 int i; 1372 1373 /* 1374 * - Tentative Address (RFC2462 section 5.4) 1375 * - A tentative address is not considered 1376 * "assigned to an interface" in the traditional 1377 * sense, unless it is also flagged as optimistic. 1378 * - Candidate Source Address (section 4) 1379 * - In any case, anycast addresses, multicast 1380 * addresses, and the unspecified address MUST 1381 * NOT be included in a candidate set. 1382 */ 1383 if ((score->ifa->flags & IFA_F_TENTATIVE) && 1384 (!(score->ifa->flags & IFA_F_OPTIMISTIC))) 1385 continue; 1386 1387 score->addr_type = __ipv6_addr_type(&score->ifa->addr); 1388 1389 if (unlikely(score->addr_type == IPV6_ADDR_ANY || 1390 score->addr_type & IPV6_ADDR_MULTICAST)) { 1391 net_dbg_ratelimited("ADDRCONF: unspecified / multicast address assigned as unicast address on %s", 1392 idev->dev->name); 1393 continue; 1394 } 1395 1396 score->rule = -1; 1397 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX); 1398 1399 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) { 1400 int minihiscore, miniscore; 1401 1402 minihiscore = ipv6_get_saddr_eval(net, hiscore, dst, i); 1403 miniscore = ipv6_get_saddr_eval(net, score, dst, i); 1404 1405 if (minihiscore > miniscore) { 1406 if (i == IPV6_SADDR_RULE_SCOPE && 1407 score->scopedist > 0) { 1408 /* 1409 * special case: 1410 * each remaining entry 1411 * has too small (not enough) 1412 * scope, because ifa entries 1413 * are sorted by their scope 1414 * values. 1415 */ 1416 goto out; 1417 } 1418 break; 1419 } else if (minihiscore < miniscore) { 1420 if (hiscore->ifa) 1421 in6_ifa_put(hiscore->ifa); 1422 1423 in6_ifa_hold(score->ifa); 1424 1425 swap(hiscore, score); 1426 hiscore_idx = 1 - hiscore_idx; 1427 1428 /* restore our iterator */ 1429 score->ifa = hiscore->ifa; 1430 1431 break; 1432 } 1433 } 1434 } 1435 out: 1436 read_unlock_bh(&idev->lock); 1437 return hiscore_idx; 1438 } 1439 1440 int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev, 1441 const struct in6_addr *daddr, unsigned int prefs, 1442 struct in6_addr *saddr) 1443 { 1444 struct ipv6_saddr_score scores[2], *hiscore; 1445 struct ipv6_saddr_dst dst; 1446 struct inet6_dev *idev; 1447 struct net_device *dev; 1448 int dst_type; 1449 bool use_oif_addr = false; 1450 int hiscore_idx = 0; 1451 1452 dst_type = __ipv6_addr_type(daddr); 1453 dst.addr = daddr; 1454 dst.ifindex = dst_dev ? dst_dev->ifindex : 0; 1455 dst.scope = __ipv6_addr_src_scope(dst_type); 1456 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex); 1457 dst.prefs = prefs; 1458 1459 scores[hiscore_idx].rule = -1; 1460 scores[hiscore_idx].ifa = NULL; 1461 1462 rcu_read_lock(); 1463 1464 /* Candidate Source Address (section 4) 1465 * - multicast and link-local destination address, 1466 * the set of candidate source address MUST only 1467 * include addresses assigned to interfaces 1468 * belonging to the same link as the outgoing 1469 * interface. 1470 * (- For site-local destination addresses, the 1471 * set of candidate source addresses MUST only 1472 * include addresses assigned to interfaces 1473 * belonging to the same site as the outgoing 1474 * interface.) 1475 */ 1476 if (dst_dev) { 1477 if ((dst_type & IPV6_ADDR_MULTICAST) || 1478 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL) { 1479 idev = __in6_dev_get(dst_dev); 1480 use_oif_addr = true; 1481 } 1482 } 1483 1484 if (use_oif_addr) { 1485 if (idev) 1486 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx); 1487 } else { 1488 for_each_netdev_rcu(net, dev) { 1489 idev = __in6_dev_get(dev); 1490 if (!idev) 1491 continue; 1492 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx); 1493 } 1494 } 1495 rcu_read_unlock(); 1496 1497 hiscore = &scores[hiscore_idx]; 1498 if (!hiscore->ifa) 1499 return -EADDRNOTAVAIL; 1500 1501 *saddr = hiscore->ifa->addr; 1502 in6_ifa_put(hiscore->ifa); 1503 return 0; 1504 } 1505 EXPORT_SYMBOL(ipv6_dev_get_saddr); 1506 1507 int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr, 1508 u32 banned_flags) 1509 { 1510 struct inet6_ifaddr *ifp; 1511 int err = -EADDRNOTAVAIL; 1512 1513 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) { 1514 if (ifp->scope > IFA_LINK) 1515 break; 1516 if (ifp->scope == IFA_LINK && 1517 !(ifp->flags & banned_flags)) { 1518 *addr = ifp->addr; 1519 err = 0; 1520 break; 1521 } 1522 } 1523 return err; 1524 } 1525 1526 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr, 1527 u32 banned_flags) 1528 { 1529 struct inet6_dev *idev; 1530 int err = -EADDRNOTAVAIL; 1531 1532 rcu_read_lock(); 1533 idev = __in6_dev_get(dev); 1534 if (idev) { 1535 read_lock_bh(&idev->lock); 1536 err = __ipv6_get_lladdr(idev, addr, banned_flags); 1537 read_unlock_bh(&idev->lock); 1538 } 1539 rcu_read_unlock(); 1540 return err; 1541 } 1542 1543 static int ipv6_count_addresses(struct inet6_dev *idev) 1544 { 1545 int cnt = 0; 1546 struct inet6_ifaddr *ifp; 1547 1548 read_lock_bh(&idev->lock); 1549 list_for_each_entry(ifp, &idev->addr_list, if_list) 1550 cnt++; 1551 read_unlock_bh(&idev->lock); 1552 return cnt; 1553 } 1554 1555 int ipv6_chk_addr(struct net *net, const struct in6_addr *addr, 1556 const struct net_device *dev, int strict) 1557 { 1558 return ipv6_chk_addr_and_flags(net, addr, dev, strict, IFA_F_TENTATIVE); 1559 } 1560 EXPORT_SYMBOL(ipv6_chk_addr); 1561 1562 int ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr, 1563 const struct net_device *dev, int strict, 1564 u32 banned_flags) 1565 { 1566 struct inet6_ifaddr *ifp; 1567 unsigned int hash = inet6_addr_hash(addr); 1568 u32 ifp_flags; 1569 1570 rcu_read_lock_bh(); 1571 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) { 1572 if (!net_eq(dev_net(ifp->idev->dev), net)) 1573 continue; 1574 /* Decouple optimistic from tentative for evaluation here. 1575 * Ban optimistic addresses explicitly, when required. 1576 */ 1577 ifp_flags = (ifp->flags&IFA_F_OPTIMISTIC) 1578 ? (ifp->flags&~IFA_F_TENTATIVE) 1579 : ifp->flags; 1580 if (ipv6_addr_equal(&ifp->addr, addr) && 1581 !(ifp_flags&banned_flags) && 1582 (!dev || ifp->idev->dev == dev || 1583 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) { 1584 rcu_read_unlock_bh(); 1585 return 1; 1586 } 1587 } 1588 1589 rcu_read_unlock_bh(); 1590 return 0; 1591 } 1592 EXPORT_SYMBOL(ipv6_chk_addr_and_flags); 1593 1594 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr, 1595 struct net_device *dev) 1596 { 1597 unsigned int hash = inet6_addr_hash(addr); 1598 struct inet6_ifaddr *ifp; 1599 1600 hlist_for_each_entry(ifp, &inet6_addr_lst[hash], addr_lst) { 1601 if (!net_eq(dev_net(ifp->idev->dev), net)) 1602 continue; 1603 if (ipv6_addr_equal(&ifp->addr, addr)) { 1604 if (!dev || ifp->idev->dev == dev) 1605 return true; 1606 } 1607 } 1608 return false; 1609 } 1610 1611 /* Compares an address/prefix_len with addresses on device @dev. 1612 * If one is found it returns true. 1613 */ 1614 bool ipv6_chk_custom_prefix(const struct in6_addr *addr, 1615 const unsigned int prefix_len, struct net_device *dev) 1616 { 1617 struct inet6_dev *idev; 1618 struct inet6_ifaddr *ifa; 1619 bool ret = false; 1620 1621 rcu_read_lock(); 1622 idev = __in6_dev_get(dev); 1623 if (idev) { 1624 read_lock_bh(&idev->lock); 1625 list_for_each_entry(ifa, &idev->addr_list, if_list) { 1626 ret = ipv6_prefix_equal(addr, &ifa->addr, prefix_len); 1627 if (ret) 1628 break; 1629 } 1630 read_unlock_bh(&idev->lock); 1631 } 1632 rcu_read_unlock(); 1633 1634 return ret; 1635 } 1636 EXPORT_SYMBOL(ipv6_chk_custom_prefix); 1637 1638 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev) 1639 { 1640 struct inet6_dev *idev; 1641 struct inet6_ifaddr *ifa; 1642 int onlink; 1643 1644 onlink = 0; 1645 rcu_read_lock(); 1646 idev = __in6_dev_get(dev); 1647 if (idev) { 1648 read_lock_bh(&idev->lock); 1649 list_for_each_entry(ifa, &idev->addr_list, if_list) { 1650 onlink = ipv6_prefix_equal(addr, &ifa->addr, 1651 ifa->prefix_len); 1652 if (onlink) 1653 break; 1654 } 1655 read_unlock_bh(&idev->lock); 1656 } 1657 rcu_read_unlock(); 1658 return onlink; 1659 } 1660 EXPORT_SYMBOL(ipv6_chk_prefix); 1661 1662 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr, 1663 struct net_device *dev, int strict) 1664 { 1665 struct inet6_ifaddr *ifp, *result = NULL; 1666 unsigned int hash = inet6_addr_hash(addr); 1667 1668 rcu_read_lock_bh(); 1669 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) { 1670 if (!net_eq(dev_net(ifp->idev->dev), net)) 1671 continue; 1672 if (ipv6_addr_equal(&ifp->addr, addr)) { 1673 if (!dev || ifp->idev->dev == dev || 1674 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) { 1675 result = ifp; 1676 in6_ifa_hold(ifp); 1677 break; 1678 } 1679 } 1680 } 1681 rcu_read_unlock_bh(); 1682 1683 return result; 1684 } 1685 1686 /* Gets referenced address, destroys ifaddr */ 1687 1688 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed) 1689 { 1690 if (ifp->flags&IFA_F_PERMANENT) { 1691 spin_lock_bh(&ifp->lock); 1692 addrconf_del_dad_work(ifp); 1693 ifp->flags |= IFA_F_TENTATIVE; 1694 if (dad_failed) 1695 ifp->flags |= IFA_F_DADFAILED; 1696 spin_unlock_bh(&ifp->lock); 1697 if (dad_failed) 1698 ipv6_ifa_notify(0, ifp); 1699 in6_ifa_put(ifp); 1700 } else if (ifp->flags&IFA_F_TEMPORARY) { 1701 struct inet6_ifaddr *ifpub; 1702 spin_lock_bh(&ifp->lock); 1703 ifpub = ifp->ifpub; 1704 if (ifpub) { 1705 in6_ifa_hold(ifpub); 1706 spin_unlock_bh(&ifp->lock); 1707 ipv6_create_tempaddr(ifpub, ifp); 1708 in6_ifa_put(ifpub); 1709 } else { 1710 spin_unlock_bh(&ifp->lock); 1711 } 1712 ipv6_del_addr(ifp); 1713 } else { 1714 ipv6_del_addr(ifp); 1715 } 1716 } 1717 1718 static int addrconf_dad_end(struct inet6_ifaddr *ifp) 1719 { 1720 int err = -ENOENT; 1721 1722 spin_lock_bh(&ifp->lock); 1723 if (ifp->state == INET6_IFADDR_STATE_DAD) { 1724 ifp->state = INET6_IFADDR_STATE_POSTDAD; 1725 err = 0; 1726 } 1727 spin_unlock_bh(&ifp->lock); 1728 1729 return err; 1730 } 1731 1732 void addrconf_dad_failure(struct inet6_ifaddr *ifp) 1733 { 1734 struct in6_addr addr; 1735 struct inet6_dev *idev = ifp->idev; 1736 struct net *net = dev_net(ifp->idev->dev); 1737 1738 if (addrconf_dad_end(ifp)) { 1739 in6_ifa_put(ifp); 1740 return; 1741 } 1742 1743 net_info_ratelimited("%s: IPv6 duplicate address %pI6c detected!\n", 1744 ifp->idev->dev->name, &ifp->addr); 1745 1746 spin_lock_bh(&ifp->lock); 1747 1748 if (ifp->flags & IFA_F_STABLE_PRIVACY) { 1749 int scope = ifp->scope; 1750 u32 flags = ifp->flags; 1751 struct in6_addr new_addr; 1752 struct inet6_ifaddr *ifp2; 1753 u32 valid_lft, preferred_lft; 1754 int pfxlen = ifp->prefix_len; 1755 int retries = ifp->stable_privacy_retry + 1; 1756 1757 if (retries > net->ipv6.sysctl.idgen_retries) { 1758 net_info_ratelimited("%s: privacy stable address generation failed because of DAD conflicts!\n", 1759 ifp->idev->dev->name); 1760 goto errdad; 1761 } 1762 1763 new_addr = ifp->addr; 1764 if (ipv6_generate_stable_address(&new_addr, retries, 1765 idev)) 1766 goto errdad; 1767 1768 valid_lft = ifp->valid_lft; 1769 preferred_lft = ifp->prefered_lft; 1770 1771 spin_unlock_bh(&ifp->lock); 1772 1773 if (idev->cnf.max_addresses && 1774 ipv6_count_addresses(idev) >= 1775 idev->cnf.max_addresses) 1776 goto lock_errdad; 1777 1778 net_info_ratelimited("%s: generating new stable privacy address because of DAD conflict\n", 1779 ifp->idev->dev->name); 1780 1781 ifp2 = ipv6_add_addr(idev, &new_addr, NULL, pfxlen, 1782 scope, flags, valid_lft, 1783 preferred_lft); 1784 if (IS_ERR(ifp2)) 1785 goto lock_errdad; 1786 1787 spin_lock_bh(&ifp2->lock); 1788 ifp2->stable_privacy_retry = retries; 1789 ifp2->state = INET6_IFADDR_STATE_PREDAD; 1790 spin_unlock_bh(&ifp2->lock); 1791 1792 addrconf_mod_dad_work(ifp2, net->ipv6.sysctl.idgen_delay); 1793 in6_ifa_put(ifp2); 1794 lock_errdad: 1795 spin_lock_bh(&ifp->lock); 1796 } else if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6) { 1797 addr.s6_addr32[0] = htonl(0xfe800000); 1798 addr.s6_addr32[1] = 0; 1799 1800 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) && 1801 ipv6_addr_equal(&ifp->addr, &addr)) { 1802 /* DAD failed for link-local based on MAC address */ 1803 idev->cnf.disable_ipv6 = 1; 1804 1805 pr_info("%s: IPv6 being disabled!\n", 1806 ifp->idev->dev->name); 1807 } 1808 } 1809 1810 errdad: 1811 /* transition from _POSTDAD to _ERRDAD */ 1812 ifp->state = INET6_IFADDR_STATE_ERRDAD; 1813 spin_unlock_bh(&ifp->lock); 1814 1815 addrconf_mod_dad_work(ifp, 0); 1816 } 1817 1818 /* Join to solicited addr multicast group. 1819 * caller must hold RTNL */ 1820 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr) 1821 { 1822 struct in6_addr maddr; 1823 1824 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP)) 1825 return; 1826 1827 addrconf_addr_solict_mult(addr, &maddr); 1828 ipv6_dev_mc_inc(dev, &maddr); 1829 } 1830 1831 /* caller must hold RTNL */ 1832 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr) 1833 { 1834 struct in6_addr maddr; 1835 1836 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP)) 1837 return; 1838 1839 addrconf_addr_solict_mult(addr, &maddr); 1840 __ipv6_dev_mc_dec(idev, &maddr); 1841 } 1842 1843 /* caller must hold RTNL */ 1844 static void addrconf_join_anycast(struct inet6_ifaddr *ifp) 1845 { 1846 struct in6_addr addr; 1847 1848 if (ifp->prefix_len >= 127) /* RFC 6164 */ 1849 return; 1850 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len); 1851 if (ipv6_addr_any(&addr)) 1852 return; 1853 __ipv6_dev_ac_inc(ifp->idev, &addr); 1854 } 1855 1856 /* caller must hold RTNL */ 1857 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp) 1858 { 1859 struct in6_addr addr; 1860 1861 if (ifp->prefix_len >= 127) /* RFC 6164 */ 1862 return; 1863 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len); 1864 if (ipv6_addr_any(&addr)) 1865 return; 1866 __ipv6_dev_ac_dec(ifp->idev, &addr); 1867 } 1868 1869 static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev) 1870 { 1871 if (dev->addr_len != ETH_ALEN) 1872 return -1; 1873 memcpy(eui, dev->dev_addr, 3); 1874 memcpy(eui + 5, dev->dev_addr + 3, 3); 1875 1876 /* 1877 * The zSeries OSA network cards can be shared among various 1878 * OS instances, but the OSA cards have only one MAC address. 1879 * This leads to duplicate address conflicts in conjunction 1880 * with IPv6 if more than one instance uses the same card. 1881 * 1882 * The driver for these cards can deliver a unique 16-bit 1883 * identifier for each instance sharing the same card. It is 1884 * placed instead of 0xFFFE in the interface identifier. The 1885 * "u" bit of the interface identifier is not inverted in this 1886 * case. Hence the resulting interface identifier has local 1887 * scope according to RFC2373. 1888 */ 1889 if (dev->dev_id) { 1890 eui[3] = (dev->dev_id >> 8) & 0xFF; 1891 eui[4] = dev->dev_id & 0xFF; 1892 } else { 1893 eui[3] = 0xFF; 1894 eui[4] = 0xFE; 1895 eui[0] ^= 2; 1896 } 1897 return 0; 1898 } 1899 1900 static int addrconf_ifid_eui64(u8 *eui, struct net_device *dev) 1901 { 1902 if (dev->addr_len != IEEE802154_ADDR_LEN) 1903 return -1; 1904 memcpy(eui, dev->dev_addr, 8); 1905 eui[0] ^= 2; 1906 return 0; 1907 } 1908 1909 static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev) 1910 { 1911 union fwnet_hwaddr *ha; 1912 1913 if (dev->addr_len != FWNET_ALEN) 1914 return -1; 1915 1916 ha = (union fwnet_hwaddr *)dev->dev_addr; 1917 1918 memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id)); 1919 eui[0] ^= 2; 1920 return 0; 1921 } 1922 1923 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev) 1924 { 1925 /* XXX: inherit EUI-64 from other interface -- yoshfuji */ 1926 if (dev->addr_len != ARCNET_ALEN) 1927 return -1; 1928 memset(eui, 0, 7); 1929 eui[7] = *(u8 *)dev->dev_addr; 1930 return 0; 1931 } 1932 1933 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev) 1934 { 1935 if (dev->addr_len != INFINIBAND_ALEN) 1936 return -1; 1937 memcpy(eui, dev->dev_addr + 12, 8); 1938 eui[0] |= 2; 1939 return 0; 1940 } 1941 1942 static int __ipv6_isatap_ifid(u8 *eui, __be32 addr) 1943 { 1944 if (addr == 0) 1945 return -1; 1946 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) || 1947 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) || 1948 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) || 1949 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) || 1950 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) || 1951 ipv4_is_lbcast(addr)) ? 0x00 : 0x02; 1952 eui[1] = 0; 1953 eui[2] = 0x5E; 1954 eui[3] = 0xFE; 1955 memcpy(eui + 4, &addr, 4); 1956 return 0; 1957 } 1958 1959 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev) 1960 { 1961 if (dev->priv_flags & IFF_ISATAP) 1962 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr); 1963 return -1; 1964 } 1965 1966 static int addrconf_ifid_gre(u8 *eui, struct net_device *dev) 1967 { 1968 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr); 1969 } 1970 1971 static int addrconf_ifid_ip6tnl(u8 *eui, struct net_device *dev) 1972 { 1973 memcpy(eui, dev->perm_addr, 3); 1974 memcpy(eui + 5, dev->perm_addr + 3, 3); 1975 eui[3] = 0xFF; 1976 eui[4] = 0xFE; 1977 eui[0] ^= 2; 1978 return 0; 1979 } 1980 1981 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev) 1982 { 1983 switch (dev->type) { 1984 case ARPHRD_ETHER: 1985 case ARPHRD_FDDI: 1986 return addrconf_ifid_eui48(eui, dev); 1987 case ARPHRD_ARCNET: 1988 return addrconf_ifid_arcnet(eui, dev); 1989 case ARPHRD_INFINIBAND: 1990 return addrconf_ifid_infiniband(eui, dev); 1991 case ARPHRD_SIT: 1992 return addrconf_ifid_sit(eui, dev); 1993 case ARPHRD_IPGRE: 1994 return addrconf_ifid_gre(eui, dev); 1995 case ARPHRD_6LOWPAN: 1996 case ARPHRD_IEEE802154: 1997 return addrconf_ifid_eui64(eui, dev); 1998 case ARPHRD_IEEE1394: 1999 return addrconf_ifid_ieee1394(eui, dev); 2000 case ARPHRD_TUNNEL6: 2001 return addrconf_ifid_ip6tnl(eui, dev); 2002 } 2003 return -1; 2004 } 2005 2006 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev) 2007 { 2008 int err = -1; 2009 struct inet6_ifaddr *ifp; 2010 2011 read_lock_bh(&idev->lock); 2012 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) { 2013 if (ifp->scope > IFA_LINK) 2014 break; 2015 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) { 2016 memcpy(eui, ifp->addr.s6_addr+8, 8); 2017 err = 0; 2018 break; 2019 } 2020 } 2021 read_unlock_bh(&idev->lock); 2022 return err; 2023 } 2024 2025 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */ 2026 static void __ipv6_regen_rndid(struct inet6_dev *idev) 2027 { 2028 regen: 2029 get_random_bytes(idev->rndid, sizeof(idev->rndid)); 2030 idev->rndid[0] &= ~0x02; 2031 2032 /* 2033 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>: 2034 * check if generated address is not inappropriate 2035 * 2036 * - Reserved subnet anycast (RFC 2526) 2037 * 11111101 11....11 1xxxxxxx 2038 * - ISATAP (RFC4214) 6.1 2039 * 00-00-5E-FE-xx-xx-xx-xx 2040 * - value 0 2041 * - XXX: already assigned to an address on the device 2042 */ 2043 if (idev->rndid[0] == 0xfd && 2044 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff && 2045 (idev->rndid[7]&0x80)) 2046 goto regen; 2047 if ((idev->rndid[0]|idev->rndid[1]) == 0) { 2048 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe) 2049 goto regen; 2050 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00) 2051 goto regen; 2052 } 2053 } 2054 2055 static void ipv6_regen_rndid(unsigned long data) 2056 { 2057 struct inet6_dev *idev = (struct inet6_dev *) data; 2058 unsigned long expires; 2059 2060 rcu_read_lock_bh(); 2061 write_lock_bh(&idev->lock); 2062 2063 if (idev->dead) 2064 goto out; 2065 2066 __ipv6_regen_rndid(idev); 2067 2068 expires = jiffies + 2069 idev->cnf.temp_prefered_lft * HZ - 2070 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * 2071 NEIGH_VAR(idev->nd_parms, RETRANS_TIME) - 2072 idev->cnf.max_desync_factor * HZ; 2073 if (time_before(expires, jiffies)) { 2074 pr_warn("%s: too short regeneration interval; timer disabled for %s\n", 2075 __func__, idev->dev->name); 2076 goto out; 2077 } 2078 2079 if (!mod_timer(&idev->regen_timer, expires)) 2080 in6_dev_hold(idev); 2081 2082 out: 2083 write_unlock_bh(&idev->lock); 2084 rcu_read_unlock_bh(); 2085 in6_dev_put(idev); 2086 } 2087 2088 static void __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) 2089 { 2090 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0) 2091 __ipv6_regen_rndid(idev); 2092 } 2093 2094 /* 2095 * Add prefix route. 2096 */ 2097 2098 static void 2099 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev, 2100 unsigned long expires, u32 flags) 2101 { 2102 struct fib6_config cfg = { 2103 .fc_table = RT6_TABLE_PREFIX, 2104 .fc_metric = IP6_RT_PRIO_ADDRCONF, 2105 .fc_ifindex = dev->ifindex, 2106 .fc_expires = expires, 2107 .fc_dst_len = plen, 2108 .fc_flags = RTF_UP | flags, 2109 .fc_nlinfo.nl_net = dev_net(dev), 2110 .fc_protocol = RTPROT_KERNEL, 2111 }; 2112 2113 cfg.fc_dst = *pfx; 2114 2115 /* Prevent useless cloning on PtP SIT. 2116 This thing is done here expecting that the whole 2117 class of non-broadcast devices need not cloning. 2118 */ 2119 #if IS_ENABLED(CONFIG_IPV6_SIT) 2120 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT)) 2121 cfg.fc_flags |= RTF_NONEXTHOP; 2122 #endif 2123 2124 ip6_route_add(&cfg); 2125 } 2126 2127 2128 static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx, 2129 int plen, 2130 const struct net_device *dev, 2131 u32 flags, u32 noflags) 2132 { 2133 struct fib6_node *fn; 2134 struct rt6_info *rt = NULL; 2135 struct fib6_table *table; 2136 2137 table = fib6_get_table(dev_net(dev), RT6_TABLE_PREFIX); 2138 if (!table) 2139 return NULL; 2140 2141 read_lock_bh(&table->tb6_lock); 2142 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0); 2143 if (!fn) 2144 goto out; 2145 2146 noflags |= RTF_CACHE; 2147 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) { 2148 if (rt->dst.dev->ifindex != dev->ifindex) 2149 continue; 2150 if ((rt->rt6i_flags & flags) != flags) 2151 continue; 2152 if ((rt->rt6i_flags & noflags) != 0) 2153 continue; 2154 dst_hold(&rt->dst); 2155 break; 2156 } 2157 out: 2158 read_unlock_bh(&table->tb6_lock); 2159 return rt; 2160 } 2161 2162 2163 /* Create "default" multicast route to the interface */ 2164 2165 static void addrconf_add_mroute(struct net_device *dev) 2166 { 2167 struct fib6_config cfg = { 2168 .fc_table = RT6_TABLE_LOCAL, 2169 .fc_metric = IP6_RT_PRIO_ADDRCONF, 2170 .fc_ifindex = dev->ifindex, 2171 .fc_dst_len = 8, 2172 .fc_flags = RTF_UP, 2173 .fc_nlinfo.nl_net = dev_net(dev), 2174 }; 2175 2176 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0); 2177 2178 ip6_route_add(&cfg); 2179 } 2180 2181 static struct inet6_dev *addrconf_add_dev(struct net_device *dev) 2182 { 2183 struct inet6_dev *idev; 2184 2185 ASSERT_RTNL(); 2186 2187 idev = ipv6_find_idev(dev); 2188 if (!idev) 2189 return ERR_PTR(-ENOBUFS); 2190 2191 if (idev->cnf.disable_ipv6) 2192 return ERR_PTR(-EACCES); 2193 2194 /* Add default multicast route */ 2195 if (!(dev->flags & IFF_LOOPBACK)) 2196 addrconf_add_mroute(dev); 2197 2198 return idev; 2199 } 2200 2201 static void manage_tempaddrs(struct inet6_dev *idev, 2202 struct inet6_ifaddr *ifp, 2203 __u32 valid_lft, __u32 prefered_lft, 2204 bool create, unsigned long now) 2205 { 2206 u32 flags; 2207 struct inet6_ifaddr *ift; 2208 2209 read_lock_bh(&idev->lock); 2210 /* update all temporary addresses in the list */ 2211 list_for_each_entry(ift, &idev->tempaddr_list, tmp_list) { 2212 int age, max_valid, max_prefered; 2213 2214 if (ifp != ift->ifpub) 2215 continue; 2216 2217 /* RFC 4941 section 3.3: 2218 * If a received option will extend the lifetime of a public 2219 * address, the lifetimes of temporary addresses should 2220 * be extended, subject to the overall constraint that no 2221 * temporary addresses should ever remain "valid" or "preferred" 2222 * for a time longer than (TEMP_VALID_LIFETIME) or 2223 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), respectively. 2224 */ 2225 age = (now - ift->cstamp) / HZ; 2226 max_valid = idev->cnf.temp_valid_lft - age; 2227 if (max_valid < 0) 2228 max_valid = 0; 2229 2230 max_prefered = idev->cnf.temp_prefered_lft - 2231 idev->cnf.max_desync_factor - age; 2232 if (max_prefered < 0) 2233 max_prefered = 0; 2234 2235 if (valid_lft > max_valid) 2236 valid_lft = max_valid; 2237 2238 if (prefered_lft > max_prefered) 2239 prefered_lft = max_prefered; 2240 2241 spin_lock(&ift->lock); 2242 flags = ift->flags; 2243 ift->valid_lft = valid_lft; 2244 ift->prefered_lft = prefered_lft; 2245 ift->tstamp = now; 2246 if (prefered_lft > 0) 2247 ift->flags &= ~IFA_F_DEPRECATED; 2248 2249 spin_unlock(&ift->lock); 2250 if (!(flags&IFA_F_TENTATIVE)) 2251 ipv6_ifa_notify(0, ift); 2252 } 2253 2254 if ((create || list_empty(&idev->tempaddr_list)) && 2255 idev->cnf.use_tempaddr > 0) { 2256 /* When a new public address is created as described 2257 * in [ADDRCONF], also create a new temporary address. 2258 * Also create a temporary address if it's enabled but 2259 * no temporary address currently exists. 2260 */ 2261 read_unlock_bh(&idev->lock); 2262 ipv6_create_tempaddr(ifp, NULL); 2263 } else { 2264 read_unlock_bh(&idev->lock); 2265 } 2266 } 2267 2268 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao) 2269 { 2270 struct prefix_info *pinfo; 2271 __u32 valid_lft; 2272 __u32 prefered_lft; 2273 int addr_type; 2274 u32 addr_flags = 0; 2275 struct inet6_dev *in6_dev; 2276 struct net *net = dev_net(dev); 2277 2278 pinfo = (struct prefix_info *) opt; 2279 2280 if (len < sizeof(struct prefix_info)) { 2281 ADBG("addrconf: prefix option too short\n"); 2282 return; 2283 } 2284 2285 /* 2286 * Validation checks ([ADDRCONF], page 19) 2287 */ 2288 2289 addr_type = ipv6_addr_type(&pinfo->prefix); 2290 2291 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL)) 2292 return; 2293 2294 valid_lft = ntohl(pinfo->valid); 2295 prefered_lft = ntohl(pinfo->prefered); 2296 2297 if (prefered_lft > valid_lft) { 2298 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n"); 2299 return; 2300 } 2301 2302 in6_dev = in6_dev_get(dev); 2303 2304 if (!in6_dev) { 2305 net_dbg_ratelimited("addrconf: device %s not configured\n", 2306 dev->name); 2307 return; 2308 } 2309 2310 /* 2311 * Two things going on here: 2312 * 1) Add routes for on-link prefixes 2313 * 2) Configure prefixes with the auto flag set 2314 */ 2315 2316 if (pinfo->onlink) { 2317 struct rt6_info *rt; 2318 unsigned long rt_expires; 2319 2320 /* Avoid arithmetic overflow. Really, we could 2321 * save rt_expires in seconds, likely valid_lft, 2322 * but it would require division in fib gc, that it 2323 * not good. 2324 */ 2325 if (HZ > USER_HZ) 2326 rt_expires = addrconf_timeout_fixup(valid_lft, HZ); 2327 else 2328 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ); 2329 2330 if (addrconf_finite_timeout(rt_expires)) 2331 rt_expires *= HZ; 2332 2333 rt = addrconf_get_prefix_route(&pinfo->prefix, 2334 pinfo->prefix_len, 2335 dev, 2336 RTF_ADDRCONF | RTF_PREFIX_RT, 2337 RTF_GATEWAY | RTF_DEFAULT); 2338 2339 if (rt) { 2340 /* Autoconf prefix route */ 2341 if (valid_lft == 0) { 2342 ip6_del_rt(rt); 2343 rt = NULL; 2344 } else if (addrconf_finite_timeout(rt_expires)) { 2345 /* not infinity */ 2346 rt6_set_expires(rt, jiffies + rt_expires); 2347 } else { 2348 rt6_clean_expires(rt); 2349 } 2350 } else if (valid_lft) { 2351 clock_t expires = 0; 2352 int flags = RTF_ADDRCONF | RTF_PREFIX_RT; 2353 if (addrconf_finite_timeout(rt_expires)) { 2354 /* not infinity */ 2355 flags |= RTF_EXPIRES; 2356 expires = jiffies_to_clock_t(rt_expires); 2357 } 2358 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len, 2359 dev, expires, flags); 2360 } 2361 ip6_rt_put(rt); 2362 } 2363 2364 /* Try to figure out our local address for this prefix */ 2365 2366 if (pinfo->autoconf && in6_dev->cnf.autoconf) { 2367 struct inet6_ifaddr *ifp; 2368 struct in6_addr addr; 2369 int create = 0, update_lft = 0; 2370 bool tokenized = false; 2371 2372 if (pinfo->prefix_len == 64) { 2373 memcpy(&addr, &pinfo->prefix, 8); 2374 2375 if (!ipv6_addr_any(&in6_dev->token)) { 2376 read_lock_bh(&in6_dev->lock); 2377 memcpy(addr.s6_addr + 8, 2378 in6_dev->token.s6_addr + 8, 8); 2379 read_unlock_bh(&in6_dev->lock); 2380 tokenized = true; 2381 } else if (in6_dev->addr_gen_mode == 2382 IN6_ADDR_GEN_MODE_STABLE_PRIVACY && 2383 !ipv6_generate_stable_address(&addr, 0, 2384 in6_dev)) { 2385 addr_flags |= IFA_F_STABLE_PRIVACY; 2386 goto ok; 2387 } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) && 2388 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) { 2389 in6_dev_put(in6_dev); 2390 return; 2391 } 2392 goto ok; 2393 } 2394 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n", 2395 pinfo->prefix_len); 2396 in6_dev_put(in6_dev); 2397 return; 2398 2399 ok: 2400 2401 ifp = ipv6_get_ifaddr(net, &addr, dev, 1); 2402 2403 if (!ifp && valid_lft) { 2404 int max_addresses = in6_dev->cnf.max_addresses; 2405 2406 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 2407 if (in6_dev->cnf.optimistic_dad && 2408 !net->ipv6.devconf_all->forwarding && sllao) 2409 addr_flags = IFA_F_OPTIMISTIC; 2410 #endif 2411 2412 /* Do not allow to create too much of autoconfigured 2413 * addresses; this would be too easy way to crash kernel. 2414 */ 2415 if (!max_addresses || 2416 ipv6_count_addresses(in6_dev) < max_addresses) 2417 ifp = ipv6_add_addr(in6_dev, &addr, NULL, 2418 pinfo->prefix_len, 2419 addr_type&IPV6_ADDR_SCOPE_MASK, 2420 addr_flags, valid_lft, 2421 prefered_lft); 2422 2423 if (IS_ERR_OR_NULL(ifp)) { 2424 in6_dev_put(in6_dev); 2425 return; 2426 } 2427 2428 update_lft = 0; 2429 create = 1; 2430 spin_lock_bh(&ifp->lock); 2431 ifp->flags |= IFA_F_MANAGETEMPADDR; 2432 ifp->cstamp = jiffies; 2433 ifp->tokenized = tokenized; 2434 spin_unlock_bh(&ifp->lock); 2435 addrconf_dad_start(ifp); 2436 } 2437 2438 if (ifp) { 2439 u32 flags; 2440 unsigned long now; 2441 u32 stored_lft; 2442 2443 /* update lifetime (RFC2462 5.5.3 e) */ 2444 spin_lock_bh(&ifp->lock); 2445 now = jiffies; 2446 if (ifp->valid_lft > (now - ifp->tstamp) / HZ) 2447 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ; 2448 else 2449 stored_lft = 0; 2450 if (!update_lft && !create && stored_lft) { 2451 const u32 minimum_lft = min_t(u32, 2452 stored_lft, MIN_VALID_LIFETIME); 2453 valid_lft = max(valid_lft, minimum_lft); 2454 2455 /* RFC4862 Section 5.5.3e: 2456 * "Note that the preferred lifetime of the 2457 * corresponding address is always reset to 2458 * the Preferred Lifetime in the received 2459 * Prefix Information option, regardless of 2460 * whether the valid lifetime is also reset or 2461 * ignored." 2462 * 2463 * So we should always update prefered_lft here. 2464 */ 2465 update_lft = 1; 2466 } 2467 2468 if (update_lft) { 2469 ifp->valid_lft = valid_lft; 2470 ifp->prefered_lft = prefered_lft; 2471 ifp->tstamp = now; 2472 flags = ifp->flags; 2473 ifp->flags &= ~IFA_F_DEPRECATED; 2474 spin_unlock_bh(&ifp->lock); 2475 2476 if (!(flags&IFA_F_TENTATIVE)) 2477 ipv6_ifa_notify(0, ifp); 2478 } else 2479 spin_unlock_bh(&ifp->lock); 2480 2481 manage_tempaddrs(in6_dev, ifp, valid_lft, prefered_lft, 2482 create, now); 2483 2484 in6_ifa_put(ifp); 2485 addrconf_verify(); 2486 } 2487 } 2488 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo); 2489 in6_dev_put(in6_dev); 2490 } 2491 2492 /* 2493 * Set destination address. 2494 * Special case for SIT interfaces where we create a new "virtual" 2495 * device. 2496 */ 2497 int addrconf_set_dstaddr(struct net *net, void __user *arg) 2498 { 2499 struct in6_ifreq ireq; 2500 struct net_device *dev; 2501 int err = -EINVAL; 2502 2503 rtnl_lock(); 2504 2505 err = -EFAULT; 2506 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2507 goto err_exit; 2508 2509 dev = __dev_get_by_index(net, ireq.ifr6_ifindex); 2510 2511 err = -ENODEV; 2512 if (!dev) 2513 goto err_exit; 2514 2515 #if IS_ENABLED(CONFIG_IPV6_SIT) 2516 if (dev->type == ARPHRD_SIT) { 2517 const struct net_device_ops *ops = dev->netdev_ops; 2518 struct ifreq ifr; 2519 struct ip_tunnel_parm p; 2520 2521 err = -EADDRNOTAVAIL; 2522 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4)) 2523 goto err_exit; 2524 2525 memset(&p, 0, sizeof(p)); 2526 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3]; 2527 p.iph.saddr = 0; 2528 p.iph.version = 4; 2529 p.iph.ihl = 5; 2530 p.iph.protocol = IPPROTO_IPV6; 2531 p.iph.ttl = 64; 2532 ifr.ifr_ifru.ifru_data = (__force void __user *)&p; 2533 2534 if (ops->ndo_do_ioctl) { 2535 mm_segment_t oldfs = get_fs(); 2536 2537 set_fs(KERNEL_DS); 2538 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL); 2539 set_fs(oldfs); 2540 } else 2541 err = -EOPNOTSUPP; 2542 2543 if (err == 0) { 2544 err = -ENOBUFS; 2545 dev = __dev_get_by_name(net, p.name); 2546 if (!dev) 2547 goto err_exit; 2548 err = dev_open(dev); 2549 } 2550 } 2551 #endif 2552 2553 err_exit: 2554 rtnl_unlock(); 2555 return err; 2556 } 2557 2558 static int ipv6_mc_config(struct sock *sk, bool join, 2559 const struct in6_addr *addr, int ifindex) 2560 { 2561 int ret; 2562 2563 ASSERT_RTNL(); 2564 2565 lock_sock(sk); 2566 if (join) 2567 ret = ipv6_sock_mc_join(sk, ifindex, addr); 2568 else 2569 ret = ipv6_sock_mc_drop(sk, ifindex, addr); 2570 release_sock(sk); 2571 2572 return ret; 2573 } 2574 2575 /* 2576 * Manual configuration of address on an interface 2577 */ 2578 static int inet6_addr_add(struct net *net, int ifindex, 2579 const struct in6_addr *pfx, 2580 const struct in6_addr *peer_pfx, 2581 unsigned int plen, __u32 ifa_flags, 2582 __u32 prefered_lft, __u32 valid_lft) 2583 { 2584 struct inet6_ifaddr *ifp; 2585 struct inet6_dev *idev; 2586 struct net_device *dev; 2587 unsigned long timeout; 2588 clock_t expires; 2589 int scope; 2590 u32 flags; 2591 2592 ASSERT_RTNL(); 2593 2594 if (plen > 128) 2595 return -EINVAL; 2596 2597 /* check the lifetime */ 2598 if (!valid_lft || prefered_lft > valid_lft) 2599 return -EINVAL; 2600 2601 if (ifa_flags & IFA_F_MANAGETEMPADDR && plen != 64) 2602 return -EINVAL; 2603 2604 dev = __dev_get_by_index(net, ifindex); 2605 if (!dev) 2606 return -ENODEV; 2607 2608 idev = addrconf_add_dev(dev); 2609 if (IS_ERR(idev)) 2610 return PTR_ERR(idev); 2611 2612 if (ifa_flags & IFA_F_MCAUTOJOIN) { 2613 int ret = ipv6_mc_config(net->ipv6.mc_autojoin_sk, 2614 true, pfx, ifindex); 2615 2616 if (ret < 0) 2617 return ret; 2618 } 2619 2620 scope = ipv6_addr_scope(pfx); 2621 2622 timeout = addrconf_timeout_fixup(valid_lft, HZ); 2623 if (addrconf_finite_timeout(timeout)) { 2624 expires = jiffies_to_clock_t(timeout * HZ); 2625 valid_lft = timeout; 2626 flags = RTF_EXPIRES; 2627 } else { 2628 expires = 0; 2629 flags = 0; 2630 ifa_flags |= IFA_F_PERMANENT; 2631 } 2632 2633 timeout = addrconf_timeout_fixup(prefered_lft, HZ); 2634 if (addrconf_finite_timeout(timeout)) { 2635 if (timeout == 0) 2636 ifa_flags |= IFA_F_DEPRECATED; 2637 prefered_lft = timeout; 2638 } 2639 2640 ifp = ipv6_add_addr(idev, pfx, peer_pfx, plen, scope, ifa_flags, 2641 valid_lft, prefered_lft); 2642 2643 if (!IS_ERR(ifp)) { 2644 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) { 2645 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev, 2646 expires, flags); 2647 } 2648 2649 /* 2650 * Note that section 3.1 of RFC 4429 indicates 2651 * that the Optimistic flag should not be set for 2652 * manually configured addresses 2653 */ 2654 addrconf_dad_start(ifp); 2655 if (ifa_flags & IFA_F_MANAGETEMPADDR) 2656 manage_tempaddrs(idev, ifp, valid_lft, prefered_lft, 2657 true, jiffies); 2658 in6_ifa_put(ifp); 2659 addrconf_verify_rtnl(); 2660 return 0; 2661 } else if (ifa_flags & IFA_F_MCAUTOJOIN) { 2662 ipv6_mc_config(net->ipv6.mc_autojoin_sk, 2663 false, pfx, ifindex); 2664 } 2665 2666 return PTR_ERR(ifp); 2667 } 2668 2669 static int inet6_addr_del(struct net *net, int ifindex, u32 ifa_flags, 2670 const struct in6_addr *pfx, unsigned int plen) 2671 { 2672 struct inet6_ifaddr *ifp; 2673 struct inet6_dev *idev; 2674 struct net_device *dev; 2675 2676 if (plen > 128) 2677 return -EINVAL; 2678 2679 dev = __dev_get_by_index(net, ifindex); 2680 if (!dev) 2681 return -ENODEV; 2682 2683 idev = __in6_dev_get(dev); 2684 if (!idev) 2685 return -ENXIO; 2686 2687 read_lock_bh(&idev->lock); 2688 list_for_each_entry(ifp, &idev->addr_list, if_list) { 2689 if (ifp->prefix_len == plen && 2690 ipv6_addr_equal(pfx, &ifp->addr)) { 2691 in6_ifa_hold(ifp); 2692 read_unlock_bh(&idev->lock); 2693 2694 if (!(ifp->flags & IFA_F_TEMPORARY) && 2695 (ifa_flags & IFA_F_MANAGETEMPADDR)) 2696 manage_tempaddrs(idev, ifp, 0, 0, false, 2697 jiffies); 2698 ipv6_del_addr(ifp); 2699 addrconf_verify_rtnl(); 2700 if (ipv6_addr_is_multicast(pfx)) { 2701 ipv6_mc_config(net->ipv6.mc_autojoin_sk, 2702 false, pfx, dev->ifindex); 2703 } 2704 return 0; 2705 } 2706 } 2707 read_unlock_bh(&idev->lock); 2708 return -EADDRNOTAVAIL; 2709 } 2710 2711 2712 int addrconf_add_ifaddr(struct net *net, void __user *arg) 2713 { 2714 struct in6_ifreq ireq; 2715 int err; 2716 2717 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 2718 return -EPERM; 2719 2720 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2721 return -EFAULT; 2722 2723 rtnl_lock(); 2724 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, NULL, 2725 ireq.ifr6_prefixlen, IFA_F_PERMANENT, 2726 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME); 2727 rtnl_unlock(); 2728 return err; 2729 } 2730 2731 int addrconf_del_ifaddr(struct net *net, void __user *arg) 2732 { 2733 struct in6_ifreq ireq; 2734 int err; 2735 2736 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 2737 return -EPERM; 2738 2739 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2740 return -EFAULT; 2741 2742 rtnl_lock(); 2743 err = inet6_addr_del(net, ireq.ifr6_ifindex, 0, &ireq.ifr6_addr, 2744 ireq.ifr6_prefixlen); 2745 rtnl_unlock(); 2746 return err; 2747 } 2748 2749 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr, 2750 int plen, int scope) 2751 { 2752 struct inet6_ifaddr *ifp; 2753 2754 ifp = ipv6_add_addr(idev, addr, NULL, plen, 2755 scope, IFA_F_PERMANENT, 2756 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME); 2757 if (!IS_ERR(ifp)) { 2758 spin_lock_bh(&ifp->lock); 2759 ifp->flags &= ~IFA_F_TENTATIVE; 2760 spin_unlock_bh(&ifp->lock); 2761 ipv6_ifa_notify(RTM_NEWADDR, ifp); 2762 in6_ifa_put(ifp); 2763 } 2764 } 2765 2766 #if IS_ENABLED(CONFIG_IPV6_SIT) 2767 static void sit_add_v4_addrs(struct inet6_dev *idev) 2768 { 2769 struct in6_addr addr; 2770 struct net_device *dev; 2771 struct net *net = dev_net(idev->dev); 2772 int scope, plen; 2773 u32 pflags = 0; 2774 2775 ASSERT_RTNL(); 2776 2777 memset(&addr, 0, sizeof(struct in6_addr)); 2778 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4); 2779 2780 if (idev->dev->flags&IFF_POINTOPOINT) { 2781 addr.s6_addr32[0] = htonl(0xfe800000); 2782 scope = IFA_LINK; 2783 plen = 64; 2784 } else { 2785 scope = IPV6_ADDR_COMPATv4; 2786 plen = 96; 2787 pflags |= RTF_NONEXTHOP; 2788 } 2789 2790 if (addr.s6_addr32[3]) { 2791 add_addr(idev, &addr, plen, scope); 2792 addrconf_prefix_route(&addr, plen, idev->dev, 0, pflags); 2793 return; 2794 } 2795 2796 for_each_netdev(net, dev) { 2797 struct in_device *in_dev = __in_dev_get_rtnl(dev); 2798 if (in_dev && (dev->flags & IFF_UP)) { 2799 struct in_ifaddr *ifa; 2800 2801 int flag = scope; 2802 2803 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) { 2804 2805 addr.s6_addr32[3] = ifa->ifa_local; 2806 2807 if (ifa->ifa_scope == RT_SCOPE_LINK) 2808 continue; 2809 if (ifa->ifa_scope >= RT_SCOPE_HOST) { 2810 if (idev->dev->flags&IFF_POINTOPOINT) 2811 continue; 2812 flag |= IFA_HOST; 2813 } 2814 2815 add_addr(idev, &addr, plen, flag); 2816 addrconf_prefix_route(&addr, plen, idev->dev, 0, 2817 pflags); 2818 } 2819 } 2820 } 2821 } 2822 #endif 2823 2824 static void init_loopback(struct net_device *dev) 2825 { 2826 struct inet6_dev *idev; 2827 struct net_device *sp_dev; 2828 struct inet6_ifaddr *sp_ifa; 2829 struct rt6_info *sp_rt; 2830 2831 /* ::1 */ 2832 2833 ASSERT_RTNL(); 2834 2835 idev = ipv6_find_idev(dev); 2836 if (!idev) { 2837 pr_debug("%s: add_dev failed\n", __func__); 2838 return; 2839 } 2840 2841 add_addr(idev, &in6addr_loopback, 128, IFA_HOST); 2842 2843 /* Add routes to other interface's IPv6 addresses */ 2844 for_each_netdev(dev_net(dev), sp_dev) { 2845 if (!strcmp(sp_dev->name, dev->name)) 2846 continue; 2847 2848 idev = __in6_dev_get(sp_dev); 2849 if (!idev) 2850 continue; 2851 2852 read_lock_bh(&idev->lock); 2853 list_for_each_entry(sp_ifa, &idev->addr_list, if_list) { 2854 2855 if (sp_ifa->flags & (IFA_F_DADFAILED | IFA_F_TENTATIVE)) 2856 continue; 2857 2858 if (sp_ifa->rt) { 2859 /* This dst has been added to garbage list when 2860 * lo device down, release this obsolete dst and 2861 * reallocate a new router for ifa. 2862 */ 2863 if (sp_ifa->rt->dst.obsolete > 0) { 2864 ip6_rt_put(sp_ifa->rt); 2865 sp_ifa->rt = NULL; 2866 } else { 2867 continue; 2868 } 2869 } 2870 2871 sp_rt = addrconf_dst_alloc(idev, &sp_ifa->addr, false); 2872 2873 /* Failure cases are ignored */ 2874 if (!IS_ERR(sp_rt)) { 2875 sp_ifa->rt = sp_rt; 2876 ip6_ins_rt(sp_rt); 2877 } 2878 } 2879 read_unlock_bh(&idev->lock); 2880 } 2881 } 2882 2883 static void addrconf_add_linklocal(struct inet6_dev *idev, 2884 const struct in6_addr *addr, u32 flags) 2885 { 2886 struct inet6_ifaddr *ifp; 2887 u32 addr_flags = flags | IFA_F_PERMANENT; 2888 2889 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 2890 if (idev->cnf.optimistic_dad && 2891 !dev_net(idev->dev)->ipv6.devconf_all->forwarding) 2892 addr_flags |= IFA_F_OPTIMISTIC; 2893 #endif 2894 2895 ifp = ipv6_add_addr(idev, addr, NULL, 64, IFA_LINK, addr_flags, 2896 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME); 2897 if (!IS_ERR(ifp)) { 2898 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0); 2899 addrconf_dad_start(ifp); 2900 in6_ifa_put(ifp); 2901 } 2902 } 2903 2904 static bool ipv6_reserved_interfaceid(struct in6_addr address) 2905 { 2906 if ((address.s6_addr32[2] | address.s6_addr32[3]) == 0) 2907 return true; 2908 2909 if (address.s6_addr32[2] == htonl(0x02005eff) && 2910 ((address.s6_addr32[3] & htonl(0xfe000000)) == htonl(0xfe000000))) 2911 return true; 2912 2913 if (address.s6_addr32[2] == htonl(0xfdffffff) && 2914 ((address.s6_addr32[3] & htonl(0xffffff80)) == htonl(0xffffff80))) 2915 return true; 2916 2917 return false; 2918 } 2919 2920 static int ipv6_generate_stable_address(struct in6_addr *address, 2921 u8 dad_count, 2922 const struct inet6_dev *idev) 2923 { 2924 static DEFINE_SPINLOCK(lock); 2925 static __u32 digest[SHA_DIGEST_WORDS]; 2926 static __u32 workspace[SHA_WORKSPACE_WORDS]; 2927 2928 static union { 2929 char __data[SHA_MESSAGE_BYTES]; 2930 struct { 2931 struct in6_addr secret; 2932 __be32 prefix[2]; 2933 unsigned char hwaddr[MAX_ADDR_LEN]; 2934 u8 dad_count; 2935 } __packed; 2936 } data; 2937 2938 struct in6_addr secret; 2939 struct in6_addr temp; 2940 struct net *net = dev_net(idev->dev); 2941 2942 BUILD_BUG_ON(sizeof(data.__data) != sizeof(data)); 2943 2944 if (idev->cnf.stable_secret.initialized) 2945 secret = idev->cnf.stable_secret.secret; 2946 else if (net->ipv6.devconf_dflt->stable_secret.initialized) 2947 secret = net->ipv6.devconf_dflt->stable_secret.secret; 2948 else 2949 return -1; 2950 2951 retry: 2952 spin_lock_bh(&lock); 2953 2954 sha_init(digest); 2955 memset(&data, 0, sizeof(data)); 2956 memset(workspace, 0, sizeof(workspace)); 2957 memcpy(data.hwaddr, idev->dev->perm_addr, idev->dev->addr_len); 2958 data.prefix[0] = address->s6_addr32[0]; 2959 data.prefix[1] = address->s6_addr32[1]; 2960 data.secret = secret; 2961 data.dad_count = dad_count; 2962 2963 sha_transform(digest, data.__data, workspace); 2964 2965 temp = *address; 2966 temp.s6_addr32[2] = (__force __be32)digest[0]; 2967 temp.s6_addr32[3] = (__force __be32)digest[1]; 2968 2969 spin_unlock_bh(&lock); 2970 2971 if (ipv6_reserved_interfaceid(temp)) { 2972 dad_count++; 2973 if (dad_count > dev_net(idev->dev)->ipv6.sysctl.idgen_retries) 2974 return -1; 2975 goto retry; 2976 } 2977 2978 *address = temp; 2979 return 0; 2980 } 2981 2982 static void addrconf_addr_gen(struct inet6_dev *idev, bool prefix_route) 2983 { 2984 struct in6_addr addr; 2985 2986 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0); 2987 2988 if (idev->addr_gen_mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY) { 2989 if (!ipv6_generate_stable_address(&addr, 0, idev)) 2990 addrconf_add_linklocal(idev, &addr, 2991 IFA_F_STABLE_PRIVACY); 2992 else if (prefix_route) 2993 addrconf_prefix_route(&addr, 64, idev->dev, 0, 0); 2994 } else if (idev->addr_gen_mode == IN6_ADDR_GEN_MODE_EUI64) { 2995 /* addrconf_add_linklocal also adds a prefix_route and we 2996 * only need to care about prefix routes if ipv6_generate_eui64 2997 * couldn't generate one. 2998 */ 2999 if (ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) == 0) 3000 addrconf_add_linklocal(idev, &addr, 0); 3001 else if (prefix_route) 3002 addrconf_prefix_route(&addr, 64, idev->dev, 0, 0); 3003 } 3004 } 3005 3006 static void addrconf_dev_config(struct net_device *dev) 3007 { 3008 struct inet6_dev *idev; 3009 3010 ASSERT_RTNL(); 3011 3012 if ((dev->type != ARPHRD_ETHER) && 3013 (dev->type != ARPHRD_FDDI) && 3014 (dev->type != ARPHRD_ARCNET) && 3015 (dev->type != ARPHRD_INFINIBAND) && 3016 (dev->type != ARPHRD_IEEE802154) && 3017 (dev->type != ARPHRD_IEEE1394) && 3018 (dev->type != ARPHRD_TUNNEL6) && 3019 (dev->type != ARPHRD_6LOWPAN)) { 3020 /* Alas, we support only Ethernet autoconfiguration. */ 3021 return; 3022 } 3023 3024 idev = addrconf_add_dev(dev); 3025 if (IS_ERR(idev)) 3026 return; 3027 3028 addrconf_addr_gen(idev, false); 3029 } 3030 3031 #if IS_ENABLED(CONFIG_IPV6_SIT) 3032 static void addrconf_sit_config(struct net_device *dev) 3033 { 3034 struct inet6_dev *idev; 3035 3036 ASSERT_RTNL(); 3037 3038 /* 3039 * Configure the tunnel with one of our IPv4 3040 * addresses... we should configure all of 3041 * our v4 addrs in the tunnel 3042 */ 3043 3044 idev = ipv6_find_idev(dev); 3045 if (!idev) { 3046 pr_debug("%s: add_dev failed\n", __func__); 3047 return; 3048 } 3049 3050 if (dev->priv_flags & IFF_ISATAP) { 3051 addrconf_addr_gen(idev, false); 3052 return; 3053 } 3054 3055 sit_add_v4_addrs(idev); 3056 3057 if (dev->flags&IFF_POINTOPOINT) 3058 addrconf_add_mroute(dev); 3059 } 3060 #endif 3061 3062 #if IS_ENABLED(CONFIG_NET_IPGRE) 3063 static void addrconf_gre_config(struct net_device *dev) 3064 { 3065 struct inet6_dev *idev; 3066 3067 ASSERT_RTNL(); 3068 3069 idev = ipv6_find_idev(dev); 3070 if (!idev) { 3071 pr_debug("%s: add_dev failed\n", __func__); 3072 return; 3073 } 3074 3075 addrconf_addr_gen(idev, true); 3076 } 3077 #endif 3078 3079 static int addrconf_notify(struct notifier_block *this, unsigned long event, 3080 void *ptr) 3081 { 3082 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 3083 struct inet6_dev *idev = __in6_dev_get(dev); 3084 int run_pending = 0; 3085 int err; 3086 3087 switch (event) { 3088 case NETDEV_REGISTER: 3089 if (!idev && dev->mtu >= IPV6_MIN_MTU) { 3090 idev = ipv6_add_dev(dev); 3091 if (IS_ERR(idev)) 3092 return notifier_from_errno(PTR_ERR(idev)); 3093 } 3094 break; 3095 3096 case NETDEV_UP: 3097 case NETDEV_CHANGE: 3098 if (dev->flags & IFF_SLAVE) 3099 break; 3100 3101 if (idev && idev->cnf.disable_ipv6) 3102 break; 3103 3104 if (event == NETDEV_UP) { 3105 if (!addrconf_qdisc_ok(dev)) { 3106 /* device is not ready yet. */ 3107 pr_info("ADDRCONF(NETDEV_UP): %s: link is not ready\n", 3108 dev->name); 3109 break; 3110 } 3111 3112 if (!idev && dev->mtu >= IPV6_MIN_MTU) 3113 idev = ipv6_add_dev(dev); 3114 3115 if (!IS_ERR_OR_NULL(idev)) { 3116 idev->if_flags |= IF_READY; 3117 run_pending = 1; 3118 } 3119 } else { 3120 if (!addrconf_qdisc_ok(dev)) { 3121 /* device is still not ready. */ 3122 break; 3123 } 3124 3125 if (idev) { 3126 if (idev->if_flags & IF_READY) 3127 /* device is already configured. */ 3128 break; 3129 idev->if_flags |= IF_READY; 3130 } 3131 3132 pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n", 3133 dev->name); 3134 3135 run_pending = 1; 3136 } 3137 3138 switch (dev->type) { 3139 #if IS_ENABLED(CONFIG_IPV6_SIT) 3140 case ARPHRD_SIT: 3141 addrconf_sit_config(dev); 3142 break; 3143 #endif 3144 #if IS_ENABLED(CONFIG_NET_IPGRE) 3145 case ARPHRD_IPGRE: 3146 addrconf_gre_config(dev); 3147 break; 3148 #endif 3149 case ARPHRD_LOOPBACK: 3150 init_loopback(dev); 3151 break; 3152 3153 default: 3154 addrconf_dev_config(dev); 3155 break; 3156 } 3157 3158 if (!IS_ERR_OR_NULL(idev)) { 3159 if (run_pending) 3160 addrconf_dad_run(idev); 3161 3162 /* 3163 * If the MTU changed during the interface down, 3164 * when the interface up, the changed MTU must be 3165 * reflected in the idev as well as routers. 3166 */ 3167 if (idev->cnf.mtu6 != dev->mtu && 3168 dev->mtu >= IPV6_MIN_MTU) { 3169 rt6_mtu_change(dev, dev->mtu); 3170 idev->cnf.mtu6 = dev->mtu; 3171 } 3172 idev->tstamp = jiffies; 3173 inet6_ifinfo_notify(RTM_NEWLINK, idev); 3174 3175 /* 3176 * If the changed mtu during down is lower than 3177 * IPV6_MIN_MTU stop IPv6 on this interface. 3178 */ 3179 if (dev->mtu < IPV6_MIN_MTU) 3180 addrconf_ifdown(dev, 1); 3181 } 3182 break; 3183 3184 case NETDEV_CHANGEMTU: 3185 if (idev && dev->mtu >= IPV6_MIN_MTU) { 3186 rt6_mtu_change(dev, dev->mtu); 3187 idev->cnf.mtu6 = dev->mtu; 3188 break; 3189 } 3190 3191 if (!idev && dev->mtu >= IPV6_MIN_MTU) { 3192 idev = ipv6_add_dev(dev); 3193 if (!IS_ERR(idev)) 3194 break; 3195 } 3196 3197 /* 3198 * if MTU under IPV6_MIN_MTU. 3199 * Stop IPv6 on this interface. 3200 */ 3201 3202 case NETDEV_DOWN: 3203 case NETDEV_UNREGISTER: 3204 /* 3205 * Remove all addresses from this interface. 3206 */ 3207 addrconf_ifdown(dev, event != NETDEV_DOWN); 3208 break; 3209 3210 case NETDEV_CHANGENAME: 3211 if (idev) { 3212 snmp6_unregister_dev(idev); 3213 addrconf_sysctl_unregister(idev); 3214 err = addrconf_sysctl_register(idev); 3215 if (err) 3216 return notifier_from_errno(err); 3217 err = snmp6_register_dev(idev); 3218 if (err) { 3219 addrconf_sysctl_unregister(idev); 3220 return notifier_from_errno(err); 3221 } 3222 } 3223 break; 3224 3225 case NETDEV_PRE_TYPE_CHANGE: 3226 case NETDEV_POST_TYPE_CHANGE: 3227 addrconf_type_change(dev, event); 3228 break; 3229 } 3230 3231 return NOTIFY_OK; 3232 } 3233 3234 /* 3235 * addrconf module should be notified of a device going up 3236 */ 3237 static struct notifier_block ipv6_dev_notf = { 3238 .notifier_call = addrconf_notify, 3239 }; 3240 3241 static void addrconf_type_change(struct net_device *dev, unsigned long event) 3242 { 3243 struct inet6_dev *idev; 3244 ASSERT_RTNL(); 3245 3246 idev = __in6_dev_get(dev); 3247 3248 if (event == NETDEV_POST_TYPE_CHANGE) 3249 ipv6_mc_remap(idev); 3250 else if (event == NETDEV_PRE_TYPE_CHANGE) 3251 ipv6_mc_unmap(idev); 3252 } 3253 3254 static int addrconf_ifdown(struct net_device *dev, int how) 3255 { 3256 struct net *net = dev_net(dev); 3257 struct inet6_dev *idev; 3258 struct inet6_ifaddr *ifa; 3259 int state, i; 3260 3261 ASSERT_RTNL(); 3262 3263 rt6_ifdown(net, dev); 3264 neigh_ifdown(&nd_tbl, dev); 3265 3266 idev = __in6_dev_get(dev); 3267 if (!idev) 3268 return -ENODEV; 3269 3270 /* 3271 * Step 1: remove reference to ipv6 device from parent device. 3272 * Do not dev_put! 3273 */ 3274 if (how) { 3275 idev->dead = 1; 3276 3277 /* protected by rtnl_lock */ 3278 RCU_INIT_POINTER(dev->ip6_ptr, NULL); 3279 3280 /* Step 1.5: remove snmp6 entry */ 3281 snmp6_unregister_dev(idev); 3282 3283 } 3284 3285 /* Step 2: clear hash table */ 3286 for (i = 0; i < IN6_ADDR_HSIZE; i++) { 3287 struct hlist_head *h = &inet6_addr_lst[i]; 3288 3289 spin_lock_bh(&addrconf_hash_lock); 3290 restart: 3291 hlist_for_each_entry_rcu(ifa, h, addr_lst) { 3292 if (ifa->idev == idev) { 3293 hlist_del_init_rcu(&ifa->addr_lst); 3294 addrconf_del_dad_work(ifa); 3295 goto restart; 3296 } 3297 } 3298 spin_unlock_bh(&addrconf_hash_lock); 3299 } 3300 3301 write_lock_bh(&idev->lock); 3302 3303 addrconf_del_rs_timer(idev); 3304 3305 /* Step 2: clear flags for stateless addrconf */ 3306 if (!how) 3307 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY); 3308 3309 if (how && del_timer(&idev->regen_timer)) 3310 in6_dev_put(idev); 3311 3312 /* Step 3: clear tempaddr list */ 3313 while (!list_empty(&idev->tempaddr_list)) { 3314 ifa = list_first_entry(&idev->tempaddr_list, 3315 struct inet6_ifaddr, tmp_list); 3316 list_del(&ifa->tmp_list); 3317 write_unlock_bh(&idev->lock); 3318 spin_lock_bh(&ifa->lock); 3319 3320 if (ifa->ifpub) { 3321 in6_ifa_put(ifa->ifpub); 3322 ifa->ifpub = NULL; 3323 } 3324 spin_unlock_bh(&ifa->lock); 3325 in6_ifa_put(ifa); 3326 write_lock_bh(&idev->lock); 3327 } 3328 3329 while (!list_empty(&idev->addr_list)) { 3330 ifa = list_first_entry(&idev->addr_list, 3331 struct inet6_ifaddr, if_list); 3332 addrconf_del_dad_work(ifa); 3333 3334 list_del(&ifa->if_list); 3335 3336 write_unlock_bh(&idev->lock); 3337 3338 spin_lock_bh(&ifa->lock); 3339 state = ifa->state; 3340 ifa->state = INET6_IFADDR_STATE_DEAD; 3341 spin_unlock_bh(&ifa->lock); 3342 3343 if (state != INET6_IFADDR_STATE_DEAD) { 3344 __ipv6_ifa_notify(RTM_DELADDR, ifa); 3345 inet6addr_notifier_call_chain(NETDEV_DOWN, ifa); 3346 } 3347 in6_ifa_put(ifa); 3348 3349 write_lock_bh(&idev->lock); 3350 } 3351 3352 write_unlock_bh(&idev->lock); 3353 3354 /* Step 5: Discard anycast and multicast list */ 3355 if (how) { 3356 ipv6_ac_destroy_dev(idev); 3357 ipv6_mc_destroy_dev(idev); 3358 } else { 3359 ipv6_mc_down(idev); 3360 } 3361 3362 idev->tstamp = jiffies; 3363 3364 /* Last: Shot the device (if unregistered) */ 3365 if (how) { 3366 addrconf_sysctl_unregister(idev); 3367 neigh_parms_release(&nd_tbl, idev->nd_parms); 3368 neigh_ifdown(&nd_tbl, dev); 3369 in6_dev_put(idev); 3370 } 3371 return 0; 3372 } 3373 3374 static void addrconf_rs_timer(unsigned long data) 3375 { 3376 struct inet6_dev *idev = (struct inet6_dev *)data; 3377 struct net_device *dev = idev->dev; 3378 struct in6_addr lladdr; 3379 3380 write_lock(&idev->lock); 3381 if (idev->dead || !(idev->if_flags & IF_READY)) 3382 goto out; 3383 3384 if (!ipv6_accept_ra(idev)) 3385 goto out; 3386 3387 /* Announcement received after solicitation was sent */ 3388 if (idev->if_flags & IF_RA_RCVD) 3389 goto out; 3390 3391 if (idev->rs_probes++ < idev->cnf.rtr_solicits) { 3392 write_unlock(&idev->lock); 3393 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE)) 3394 ndisc_send_rs(dev, &lladdr, 3395 &in6addr_linklocal_allrouters); 3396 else 3397 goto put; 3398 3399 write_lock(&idev->lock); 3400 /* The wait after the last probe can be shorter */ 3401 addrconf_mod_rs_timer(idev, (idev->rs_probes == 3402 idev->cnf.rtr_solicits) ? 3403 idev->cnf.rtr_solicit_delay : 3404 idev->cnf.rtr_solicit_interval); 3405 } else { 3406 /* 3407 * Note: we do not support deprecated "all on-link" 3408 * assumption any longer. 3409 */ 3410 pr_debug("%s: no IPv6 routers present\n", idev->dev->name); 3411 } 3412 3413 out: 3414 write_unlock(&idev->lock); 3415 put: 3416 in6_dev_put(idev); 3417 } 3418 3419 /* 3420 * Duplicate Address Detection 3421 */ 3422 static void addrconf_dad_kick(struct inet6_ifaddr *ifp) 3423 { 3424 unsigned long rand_num; 3425 struct inet6_dev *idev = ifp->idev; 3426 3427 if (ifp->flags & IFA_F_OPTIMISTIC) 3428 rand_num = 0; 3429 else 3430 rand_num = prandom_u32() % (idev->cnf.rtr_solicit_delay ? : 1); 3431 3432 ifp->dad_probes = idev->cnf.dad_transmits; 3433 addrconf_mod_dad_work(ifp, rand_num); 3434 } 3435 3436 static void addrconf_dad_begin(struct inet6_ifaddr *ifp) 3437 { 3438 struct inet6_dev *idev = ifp->idev; 3439 struct net_device *dev = idev->dev; 3440 3441 addrconf_join_solict(dev, &ifp->addr); 3442 3443 prandom_seed((__force u32) ifp->addr.s6_addr32[3]); 3444 3445 read_lock_bh(&idev->lock); 3446 spin_lock(&ifp->lock); 3447 if (ifp->state == INET6_IFADDR_STATE_DEAD) 3448 goto out; 3449 3450 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) || 3451 idev->cnf.accept_dad < 1 || 3452 !(ifp->flags&IFA_F_TENTATIVE) || 3453 ifp->flags & IFA_F_NODAD) { 3454 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED); 3455 spin_unlock(&ifp->lock); 3456 read_unlock_bh(&idev->lock); 3457 3458 addrconf_dad_completed(ifp); 3459 return; 3460 } 3461 3462 if (!(idev->if_flags & IF_READY)) { 3463 spin_unlock(&ifp->lock); 3464 read_unlock_bh(&idev->lock); 3465 /* 3466 * If the device is not ready: 3467 * - keep it tentative if it is a permanent address. 3468 * - otherwise, kill it. 3469 */ 3470 in6_ifa_hold(ifp); 3471 addrconf_dad_stop(ifp, 0); 3472 return; 3473 } 3474 3475 /* 3476 * Optimistic nodes can start receiving 3477 * Frames right away 3478 */ 3479 if (ifp->flags & IFA_F_OPTIMISTIC) { 3480 ip6_ins_rt(ifp->rt); 3481 if (ipv6_use_optimistic_addr(idev)) { 3482 /* Because optimistic nodes can use this address, 3483 * notify listeners. If DAD fails, RTM_DELADDR is sent. 3484 */ 3485 ipv6_ifa_notify(RTM_NEWADDR, ifp); 3486 } 3487 } 3488 3489 addrconf_dad_kick(ifp); 3490 out: 3491 spin_unlock(&ifp->lock); 3492 read_unlock_bh(&idev->lock); 3493 } 3494 3495 static void addrconf_dad_start(struct inet6_ifaddr *ifp) 3496 { 3497 bool begin_dad = false; 3498 3499 spin_lock_bh(&ifp->lock); 3500 if (ifp->state != INET6_IFADDR_STATE_DEAD) { 3501 ifp->state = INET6_IFADDR_STATE_PREDAD; 3502 begin_dad = true; 3503 } 3504 spin_unlock_bh(&ifp->lock); 3505 3506 if (begin_dad) 3507 addrconf_mod_dad_work(ifp, 0); 3508 } 3509 3510 static void addrconf_dad_work(struct work_struct *w) 3511 { 3512 struct inet6_ifaddr *ifp = container_of(to_delayed_work(w), 3513 struct inet6_ifaddr, 3514 dad_work); 3515 struct inet6_dev *idev = ifp->idev; 3516 struct in6_addr mcaddr; 3517 3518 enum { 3519 DAD_PROCESS, 3520 DAD_BEGIN, 3521 DAD_ABORT, 3522 } action = DAD_PROCESS; 3523 3524 rtnl_lock(); 3525 3526 spin_lock_bh(&ifp->lock); 3527 if (ifp->state == INET6_IFADDR_STATE_PREDAD) { 3528 action = DAD_BEGIN; 3529 ifp->state = INET6_IFADDR_STATE_DAD; 3530 } else if (ifp->state == INET6_IFADDR_STATE_ERRDAD) { 3531 action = DAD_ABORT; 3532 ifp->state = INET6_IFADDR_STATE_POSTDAD; 3533 } 3534 spin_unlock_bh(&ifp->lock); 3535 3536 if (action == DAD_BEGIN) { 3537 addrconf_dad_begin(ifp); 3538 goto out; 3539 } else if (action == DAD_ABORT) { 3540 addrconf_dad_stop(ifp, 1); 3541 goto out; 3542 } 3543 3544 if (!ifp->dad_probes && addrconf_dad_end(ifp)) 3545 goto out; 3546 3547 write_lock_bh(&idev->lock); 3548 if (idev->dead || !(idev->if_flags & IF_READY)) { 3549 write_unlock_bh(&idev->lock); 3550 goto out; 3551 } 3552 3553 spin_lock(&ifp->lock); 3554 if (ifp->state == INET6_IFADDR_STATE_DEAD) { 3555 spin_unlock(&ifp->lock); 3556 write_unlock_bh(&idev->lock); 3557 goto out; 3558 } 3559 3560 if (ifp->dad_probes == 0) { 3561 /* 3562 * DAD was successful 3563 */ 3564 3565 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED); 3566 spin_unlock(&ifp->lock); 3567 write_unlock_bh(&idev->lock); 3568 3569 addrconf_dad_completed(ifp); 3570 3571 goto out; 3572 } 3573 3574 ifp->dad_probes--; 3575 addrconf_mod_dad_work(ifp, 3576 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME)); 3577 spin_unlock(&ifp->lock); 3578 write_unlock_bh(&idev->lock); 3579 3580 /* send a neighbour solicitation for our addr */ 3581 addrconf_addr_solict_mult(&ifp->addr, &mcaddr); 3582 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &in6addr_any); 3583 out: 3584 in6_ifa_put(ifp); 3585 rtnl_unlock(); 3586 } 3587 3588 /* ifp->idev must be at least read locked */ 3589 static bool ipv6_lonely_lladdr(struct inet6_ifaddr *ifp) 3590 { 3591 struct inet6_ifaddr *ifpiter; 3592 struct inet6_dev *idev = ifp->idev; 3593 3594 list_for_each_entry_reverse(ifpiter, &idev->addr_list, if_list) { 3595 if (ifpiter->scope > IFA_LINK) 3596 break; 3597 if (ifp != ifpiter && ifpiter->scope == IFA_LINK && 3598 (ifpiter->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE| 3599 IFA_F_OPTIMISTIC|IFA_F_DADFAILED)) == 3600 IFA_F_PERMANENT) 3601 return false; 3602 } 3603 return true; 3604 } 3605 3606 static void addrconf_dad_completed(struct inet6_ifaddr *ifp) 3607 { 3608 struct net_device *dev = ifp->idev->dev; 3609 struct in6_addr lladdr; 3610 bool send_rs, send_mld; 3611 3612 addrconf_del_dad_work(ifp); 3613 3614 /* 3615 * Configure the address for reception. Now it is valid. 3616 */ 3617 3618 ipv6_ifa_notify(RTM_NEWADDR, ifp); 3619 3620 /* If added prefix is link local and we are prepared to process 3621 router advertisements, start sending router solicitations. 3622 */ 3623 3624 read_lock_bh(&ifp->idev->lock); 3625 send_mld = ifp->scope == IFA_LINK && ipv6_lonely_lladdr(ifp); 3626 send_rs = send_mld && 3627 ipv6_accept_ra(ifp->idev) && 3628 ifp->idev->cnf.rtr_solicits > 0 && 3629 (dev->flags&IFF_LOOPBACK) == 0; 3630 read_unlock_bh(&ifp->idev->lock); 3631 3632 /* While dad is in progress mld report's source address is in6_addrany. 3633 * Resend with proper ll now. 3634 */ 3635 if (send_mld) 3636 ipv6_mc_dad_complete(ifp->idev); 3637 3638 if (send_rs) { 3639 /* 3640 * If a host as already performed a random delay 3641 * [...] as part of DAD [...] there is no need 3642 * to delay again before sending the first RS 3643 */ 3644 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE)) 3645 return; 3646 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters); 3647 3648 write_lock_bh(&ifp->idev->lock); 3649 spin_lock(&ifp->lock); 3650 ifp->idev->rs_probes = 1; 3651 ifp->idev->if_flags |= IF_RS_SENT; 3652 addrconf_mod_rs_timer(ifp->idev, 3653 ifp->idev->cnf.rtr_solicit_interval); 3654 spin_unlock(&ifp->lock); 3655 write_unlock_bh(&ifp->idev->lock); 3656 } 3657 } 3658 3659 static void addrconf_dad_run(struct inet6_dev *idev) 3660 { 3661 struct inet6_ifaddr *ifp; 3662 3663 read_lock_bh(&idev->lock); 3664 list_for_each_entry(ifp, &idev->addr_list, if_list) { 3665 spin_lock(&ifp->lock); 3666 if (ifp->flags & IFA_F_TENTATIVE && 3667 ifp->state == INET6_IFADDR_STATE_DAD) 3668 addrconf_dad_kick(ifp); 3669 spin_unlock(&ifp->lock); 3670 } 3671 read_unlock_bh(&idev->lock); 3672 } 3673 3674 #ifdef CONFIG_PROC_FS 3675 struct if6_iter_state { 3676 struct seq_net_private p; 3677 int bucket; 3678 int offset; 3679 }; 3680 3681 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos) 3682 { 3683 struct inet6_ifaddr *ifa = NULL; 3684 struct if6_iter_state *state = seq->private; 3685 struct net *net = seq_file_net(seq); 3686 int p = 0; 3687 3688 /* initial bucket if pos is 0 */ 3689 if (pos == 0) { 3690 state->bucket = 0; 3691 state->offset = 0; 3692 } 3693 3694 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) { 3695 hlist_for_each_entry_rcu_bh(ifa, &inet6_addr_lst[state->bucket], 3696 addr_lst) { 3697 if (!net_eq(dev_net(ifa->idev->dev), net)) 3698 continue; 3699 /* sync with offset */ 3700 if (p < state->offset) { 3701 p++; 3702 continue; 3703 } 3704 state->offset++; 3705 return ifa; 3706 } 3707 3708 /* prepare for next bucket */ 3709 state->offset = 0; 3710 p = 0; 3711 } 3712 return NULL; 3713 } 3714 3715 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, 3716 struct inet6_ifaddr *ifa) 3717 { 3718 struct if6_iter_state *state = seq->private; 3719 struct net *net = seq_file_net(seq); 3720 3721 hlist_for_each_entry_continue_rcu_bh(ifa, addr_lst) { 3722 if (!net_eq(dev_net(ifa->idev->dev), net)) 3723 continue; 3724 state->offset++; 3725 return ifa; 3726 } 3727 3728 while (++state->bucket < IN6_ADDR_HSIZE) { 3729 state->offset = 0; 3730 hlist_for_each_entry_rcu_bh(ifa, 3731 &inet6_addr_lst[state->bucket], addr_lst) { 3732 if (!net_eq(dev_net(ifa->idev->dev), net)) 3733 continue; 3734 state->offset++; 3735 return ifa; 3736 } 3737 } 3738 3739 return NULL; 3740 } 3741 3742 static void *if6_seq_start(struct seq_file *seq, loff_t *pos) 3743 __acquires(rcu_bh) 3744 { 3745 rcu_read_lock_bh(); 3746 return if6_get_first(seq, *pos); 3747 } 3748 3749 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos) 3750 { 3751 struct inet6_ifaddr *ifa; 3752 3753 ifa = if6_get_next(seq, v); 3754 ++*pos; 3755 return ifa; 3756 } 3757 3758 static void if6_seq_stop(struct seq_file *seq, void *v) 3759 __releases(rcu_bh) 3760 { 3761 rcu_read_unlock_bh(); 3762 } 3763 3764 static int if6_seq_show(struct seq_file *seq, void *v) 3765 { 3766 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v; 3767 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n", 3768 &ifp->addr, 3769 ifp->idev->dev->ifindex, 3770 ifp->prefix_len, 3771 ifp->scope, 3772 (u8) ifp->flags, 3773 ifp->idev->dev->name); 3774 return 0; 3775 } 3776 3777 static const struct seq_operations if6_seq_ops = { 3778 .start = if6_seq_start, 3779 .next = if6_seq_next, 3780 .show = if6_seq_show, 3781 .stop = if6_seq_stop, 3782 }; 3783 3784 static int if6_seq_open(struct inode *inode, struct file *file) 3785 { 3786 return seq_open_net(inode, file, &if6_seq_ops, 3787 sizeof(struct if6_iter_state)); 3788 } 3789 3790 static const struct file_operations if6_fops = { 3791 .owner = THIS_MODULE, 3792 .open = if6_seq_open, 3793 .read = seq_read, 3794 .llseek = seq_lseek, 3795 .release = seq_release_net, 3796 }; 3797 3798 static int __net_init if6_proc_net_init(struct net *net) 3799 { 3800 if (!proc_create("if_inet6", S_IRUGO, net->proc_net, &if6_fops)) 3801 return -ENOMEM; 3802 return 0; 3803 } 3804 3805 static void __net_exit if6_proc_net_exit(struct net *net) 3806 { 3807 remove_proc_entry("if_inet6", net->proc_net); 3808 } 3809 3810 static struct pernet_operations if6_proc_net_ops = { 3811 .init = if6_proc_net_init, 3812 .exit = if6_proc_net_exit, 3813 }; 3814 3815 int __init if6_proc_init(void) 3816 { 3817 return register_pernet_subsys(&if6_proc_net_ops); 3818 } 3819 3820 void if6_proc_exit(void) 3821 { 3822 unregister_pernet_subsys(&if6_proc_net_ops); 3823 } 3824 #endif /* CONFIG_PROC_FS */ 3825 3826 #if IS_ENABLED(CONFIG_IPV6_MIP6) 3827 /* Check if address is a home address configured on any interface. */ 3828 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr) 3829 { 3830 int ret = 0; 3831 struct inet6_ifaddr *ifp = NULL; 3832 unsigned int hash = inet6_addr_hash(addr); 3833 3834 rcu_read_lock_bh(); 3835 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) { 3836 if (!net_eq(dev_net(ifp->idev->dev), net)) 3837 continue; 3838 if (ipv6_addr_equal(&ifp->addr, addr) && 3839 (ifp->flags & IFA_F_HOMEADDRESS)) { 3840 ret = 1; 3841 break; 3842 } 3843 } 3844 rcu_read_unlock_bh(); 3845 return ret; 3846 } 3847 #endif 3848 3849 /* 3850 * Periodic address status verification 3851 */ 3852 3853 static void addrconf_verify_rtnl(void) 3854 { 3855 unsigned long now, next, next_sec, next_sched; 3856 struct inet6_ifaddr *ifp; 3857 int i; 3858 3859 ASSERT_RTNL(); 3860 3861 rcu_read_lock_bh(); 3862 now = jiffies; 3863 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY); 3864 3865 cancel_delayed_work(&addr_chk_work); 3866 3867 for (i = 0; i < IN6_ADDR_HSIZE; i++) { 3868 restart: 3869 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[i], addr_lst) { 3870 unsigned long age; 3871 3872 /* When setting preferred_lft to a value not zero or 3873 * infinity, while valid_lft is infinity 3874 * IFA_F_PERMANENT has a non-infinity life time. 3875 */ 3876 if ((ifp->flags & IFA_F_PERMANENT) && 3877 (ifp->prefered_lft == INFINITY_LIFE_TIME)) 3878 continue; 3879 3880 spin_lock(&ifp->lock); 3881 /* We try to batch several events at once. */ 3882 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ; 3883 3884 if (ifp->valid_lft != INFINITY_LIFE_TIME && 3885 age >= ifp->valid_lft) { 3886 spin_unlock(&ifp->lock); 3887 in6_ifa_hold(ifp); 3888 ipv6_del_addr(ifp); 3889 goto restart; 3890 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) { 3891 spin_unlock(&ifp->lock); 3892 continue; 3893 } else if (age >= ifp->prefered_lft) { 3894 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */ 3895 int deprecate = 0; 3896 3897 if (!(ifp->flags&IFA_F_DEPRECATED)) { 3898 deprecate = 1; 3899 ifp->flags |= IFA_F_DEPRECATED; 3900 } 3901 3902 if ((ifp->valid_lft != INFINITY_LIFE_TIME) && 3903 (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))) 3904 next = ifp->tstamp + ifp->valid_lft * HZ; 3905 3906 spin_unlock(&ifp->lock); 3907 3908 if (deprecate) { 3909 in6_ifa_hold(ifp); 3910 3911 ipv6_ifa_notify(0, ifp); 3912 in6_ifa_put(ifp); 3913 goto restart; 3914 } 3915 } else if ((ifp->flags&IFA_F_TEMPORARY) && 3916 !(ifp->flags&IFA_F_TENTATIVE)) { 3917 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry * 3918 ifp->idev->cnf.dad_transmits * 3919 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME) / HZ; 3920 3921 if (age >= ifp->prefered_lft - regen_advance) { 3922 struct inet6_ifaddr *ifpub = ifp->ifpub; 3923 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 3924 next = ifp->tstamp + ifp->prefered_lft * HZ; 3925 if (!ifp->regen_count && ifpub) { 3926 ifp->regen_count++; 3927 in6_ifa_hold(ifp); 3928 in6_ifa_hold(ifpub); 3929 spin_unlock(&ifp->lock); 3930 3931 spin_lock(&ifpub->lock); 3932 ifpub->regen_count = 0; 3933 spin_unlock(&ifpub->lock); 3934 ipv6_create_tempaddr(ifpub, ifp); 3935 in6_ifa_put(ifpub); 3936 in6_ifa_put(ifp); 3937 goto restart; 3938 } 3939 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next)) 3940 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ; 3941 spin_unlock(&ifp->lock); 3942 } else { 3943 /* ifp->prefered_lft <= ifp->valid_lft */ 3944 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 3945 next = ifp->tstamp + ifp->prefered_lft * HZ; 3946 spin_unlock(&ifp->lock); 3947 } 3948 } 3949 } 3950 3951 next_sec = round_jiffies_up(next); 3952 next_sched = next; 3953 3954 /* If rounded timeout is accurate enough, accept it. */ 3955 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ)) 3956 next_sched = next_sec; 3957 3958 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */ 3959 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX)) 3960 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX; 3961 3962 ADBG(KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n", 3963 now, next, next_sec, next_sched); 3964 mod_delayed_work(addrconf_wq, &addr_chk_work, next_sched - now); 3965 rcu_read_unlock_bh(); 3966 } 3967 3968 static void addrconf_verify_work(struct work_struct *w) 3969 { 3970 rtnl_lock(); 3971 addrconf_verify_rtnl(); 3972 rtnl_unlock(); 3973 } 3974 3975 static void addrconf_verify(void) 3976 { 3977 mod_delayed_work(addrconf_wq, &addr_chk_work, 0); 3978 } 3979 3980 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local, 3981 struct in6_addr **peer_pfx) 3982 { 3983 struct in6_addr *pfx = NULL; 3984 3985 *peer_pfx = NULL; 3986 3987 if (addr) 3988 pfx = nla_data(addr); 3989 3990 if (local) { 3991 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx))) 3992 *peer_pfx = pfx; 3993 pfx = nla_data(local); 3994 } 3995 3996 return pfx; 3997 } 3998 3999 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = { 4000 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) }, 4001 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) }, 4002 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) }, 4003 [IFA_FLAGS] = { .len = sizeof(u32) }, 4004 }; 4005 4006 static int 4007 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh) 4008 { 4009 struct net *net = sock_net(skb->sk); 4010 struct ifaddrmsg *ifm; 4011 struct nlattr *tb[IFA_MAX+1]; 4012 struct in6_addr *pfx, *peer_pfx; 4013 u32 ifa_flags; 4014 int err; 4015 4016 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy); 4017 if (err < 0) 4018 return err; 4019 4020 ifm = nlmsg_data(nlh); 4021 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx); 4022 if (!pfx) 4023 return -EINVAL; 4024 4025 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags; 4026 4027 /* We ignore other flags so far. */ 4028 ifa_flags &= IFA_F_MANAGETEMPADDR; 4029 4030 return inet6_addr_del(net, ifm->ifa_index, ifa_flags, pfx, 4031 ifm->ifa_prefixlen); 4032 } 4033 4034 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u32 ifa_flags, 4035 u32 prefered_lft, u32 valid_lft) 4036 { 4037 u32 flags; 4038 clock_t expires; 4039 unsigned long timeout; 4040 bool was_managetempaddr; 4041 bool had_prefixroute; 4042 4043 ASSERT_RTNL(); 4044 4045 if (!valid_lft || (prefered_lft > valid_lft)) 4046 return -EINVAL; 4047 4048 if (ifa_flags & IFA_F_MANAGETEMPADDR && 4049 (ifp->flags & IFA_F_TEMPORARY || ifp->prefix_len != 64)) 4050 return -EINVAL; 4051 4052 timeout = addrconf_timeout_fixup(valid_lft, HZ); 4053 if (addrconf_finite_timeout(timeout)) { 4054 expires = jiffies_to_clock_t(timeout * HZ); 4055 valid_lft = timeout; 4056 flags = RTF_EXPIRES; 4057 } else { 4058 expires = 0; 4059 flags = 0; 4060 ifa_flags |= IFA_F_PERMANENT; 4061 } 4062 4063 timeout = addrconf_timeout_fixup(prefered_lft, HZ); 4064 if (addrconf_finite_timeout(timeout)) { 4065 if (timeout == 0) 4066 ifa_flags |= IFA_F_DEPRECATED; 4067 prefered_lft = timeout; 4068 } 4069 4070 spin_lock_bh(&ifp->lock); 4071 was_managetempaddr = ifp->flags & IFA_F_MANAGETEMPADDR; 4072 had_prefixroute = ifp->flags & IFA_F_PERMANENT && 4073 !(ifp->flags & IFA_F_NOPREFIXROUTE); 4074 ifp->flags &= ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | 4075 IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR | 4076 IFA_F_NOPREFIXROUTE); 4077 ifp->flags |= ifa_flags; 4078 ifp->tstamp = jiffies; 4079 ifp->valid_lft = valid_lft; 4080 ifp->prefered_lft = prefered_lft; 4081 4082 spin_unlock_bh(&ifp->lock); 4083 if (!(ifp->flags&IFA_F_TENTATIVE)) 4084 ipv6_ifa_notify(0, ifp); 4085 4086 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) { 4087 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev, 4088 expires, flags); 4089 } else if (had_prefixroute) { 4090 enum cleanup_prefix_rt_t action; 4091 unsigned long rt_expires; 4092 4093 write_lock_bh(&ifp->idev->lock); 4094 action = check_cleanup_prefix_route(ifp, &rt_expires); 4095 write_unlock_bh(&ifp->idev->lock); 4096 4097 if (action != CLEANUP_PREFIX_RT_NOP) { 4098 cleanup_prefix_route(ifp, rt_expires, 4099 action == CLEANUP_PREFIX_RT_DEL); 4100 } 4101 } 4102 4103 if (was_managetempaddr || ifp->flags & IFA_F_MANAGETEMPADDR) { 4104 if (was_managetempaddr && !(ifp->flags & IFA_F_MANAGETEMPADDR)) 4105 valid_lft = prefered_lft = 0; 4106 manage_tempaddrs(ifp->idev, ifp, valid_lft, prefered_lft, 4107 !was_managetempaddr, jiffies); 4108 } 4109 4110 addrconf_verify_rtnl(); 4111 4112 return 0; 4113 } 4114 4115 static int 4116 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh) 4117 { 4118 struct net *net = sock_net(skb->sk); 4119 struct ifaddrmsg *ifm; 4120 struct nlattr *tb[IFA_MAX+1]; 4121 struct in6_addr *pfx, *peer_pfx; 4122 struct inet6_ifaddr *ifa; 4123 struct net_device *dev; 4124 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME; 4125 u32 ifa_flags; 4126 int err; 4127 4128 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy); 4129 if (err < 0) 4130 return err; 4131 4132 ifm = nlmsg_data(nlh); 4133 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx); 4134 if (!pfx) 4135 return -EINVAL; 4136 4137 if (tb[IFA_CACHEINFO]) { 4138 struct ifa_cacheinfo *ci; 4139 4140 ci = nla_data(tb[IFA_CACHEINFO]); 4141 valid_lft = ci->ifa_valid; 4142 preferred_lft = ci->ifa_prefered; 4143 } else { 4144 preferred_lft = INFINITY_LIFE_TIME; 4145 valid_lft = INFINITY_LIFE_TIME; 4146 } 4147 4148 dev = __dev_get_by_index(net, ifm->ifa_index); 4149 if (!dev) 4150 return -ENODEV; 4151 4152 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags; 4153 4154 /* We ignore other flags so far. */ 4155 ifa_flags &= IFA_F_NODAD | IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR | 4156 IFA_F_NOPREFIXROUTE | IFA_F_MCAUTOJOIN; 4157 4158 ifa = ipv6_get_ifaddr(net, pfx, dev, 1); 4159 if (!ifa) { 4160 /* 4161 * It would be best to check for !NLM_F_CREATE here but 4162 * userspace already relies on not having to provide this. 4163 */ 4164 return inet6_addr_add(net, ifm->ifa_index, pfx, peer_pfx, 4165 ifm->ifa_prefixlen, ifa_flags, 4166 preferred_lft, valid_lft); 4167 } 4168 4169 if (nlh->nlmsg_flags & NLM_F_EXCL || 4170 !(nlh->nlmsg_flags & NLM_F_REPLACE)) 4171 err = -EEXIST; 4172 else 4173 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft); 4174 4175 in6_ifa_put(ifa); 4176 4177 return err; 4178 } 4179 4180 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u32 flags, 4181 u8 scope, int ifindex) 4182 { 4183 struct ifaddrmsg *ifm; 4184 4185 ifm = nlmsg_data(nlh); 4186 ifm->ifa_family = AF_INET6; 4187 ifm->ifa_prefixlen = prefixlen; 4188 ifm->ifa_flags = flags; 4189 ifm->ifa_scope = scope; 4190 ifm->ifa_index = ifindex; 4191 } 4192 4193 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp, 4194 unsigned long tstamp, u32 preferred, u32 valid) 4195 { 4196 struct ifa_cacheinfo ci; 4197 4198 ci.cstamp = cstamp_delta(cstamp); 4199 ci.tstamp = cstamp_delta(tstamp); 4200 ci.ifa_prefered = preferred; 4201 ci.ifa_valid = valid; 4202 4203 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci); 4204 } 4205 4206 static inline int rt_scope(int ifa_scope) 4207 { 4208 if (ifa_scope & IFA_HOST) 4209 return RT_SCOPE_HOST; 4210 else if (ifa_scope & IFA_LINK) 4211 return RT_SCOPE_LINK; 4212 else if (ifa_scope & IFA_SITE) 4213 return RT_SCOPE_SITE; 4214 else 4215 return RT_SCOPE_UNIVERSE; 4216 } 4217 4218 static inline int inet6_ifaddr_msgsize(void) 4219 { 4220 return NLMSG_ALIGN(sizeof(struct ifaddrmsg)) 4221 + nla_total_size(16) /* IFA_LOCAL */ 4222 + nla_total_size(16) /* IFA_ADDRESS */ 4223 + nla_total_size(sizeof(struct ifa_cacheinfo)) 4224 + nla_total_size(4) /* IFA_FLAGS */; 4225 } 4226 4227 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa, 4228 u32 portid, u32 seq, int event, unsigned int flags) 4229 { 4230 struct nlmsghdr *nlh; 4231 u32 preferred, valid; 4232 4233 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags); 4234 if (!nlh) 4235 return -EMSGSIZE; 4236 4237 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope), 4238 ifa->idev->dev->ifindex); 4239 4240 if (!((ifa->flags&IFA_F_PERMANENT) && 4241 (ifa->prefered_lft == INFINITY_LIFE_TIME))) { 4242 preferred = ifa->prefered_lft; 4243 valid = ifa->valid_lft; 4244 if (preferred != INFINITY_LIFE_TIME) { 4245 long tval = (jiffies - ifa->tstamp)/HZ; 4246 if (preferred > tval) 4247 preferred -= tval; 4248 else 4249 preferred = 0; 4250 if (valid != INFINITY_LIFE_TIME) { 4251 if (valid > tval) 4252 valid -= tval; 4253 else 4254 valid = 0; 4255 } 4256 } 4257 } else { 4258 preferred = INFINITY_LIFE_TIME; 4259 valid = INFINITY_LIFE_TIME; 4260 } 4261 4262 if (!ipv6_addr_any(&ifa->peer_addr)) { 4263 if (nla_put_in6_addr(skb, IFA_LOCAL, &ifa->addr) < 0 || 4264 nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->peer_addr) < 0) 4265 goto error; 4266 } else 4267 if (nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->addr) < 0) 4268 goto error; 4269 4270 if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) 4271 goto error; 4272 4273 if (nla_put_u32(skb, IFA_FLAGS, ifa->flags) < 0) 4274 goto error; 4275 4276 nlmsg_end(skb, nlh); 4277 return 0; 4278 4279 error: 4280 nlmsg_cancel(skb, nlh); 4281 return -EMSGSIZE; 4282 } 4283 4284 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca, 4285 u32 portid, u32 seq, int event, u16 flags) 4286 { 4287 struct nlmsghdr *nlh; 4288 u8 scope = RT_SCOPE_UNIVERSE; 4289 int ifindex = ifmca->idev->dev->ifindex; 4290 4291 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE) 4292 scope = RT_SCOPE_SITE; 4293 4294 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags); 4295 if (!nlh) 4296 return -EMSGSIZE; 4297 4298 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 4299 if (nla_put_in6_addr(skb, IFA_MULTICAST, &ifmca->mca_addr) < 0 || 4300 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp, 4301 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 4302 nlmsg_cancel(skb, nlh); 4303 return -EMSGSIZE; 4304 } 4305 4306 nlmsg_end(skb, nlh); 4307 return 0; 4308 } 4309 4310 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca, 4311 u32 portid, u32 seq, int event, unsigned int flags) 4312 { 4313 struct nlmsghdr *nlh; 4314 u8 scope = RT_SCOPE_UNIVERSE; 4315 int ifindex = ifaca->aca_idev->dev->ifindex; 4316 4317 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE) 4318 scope = RT_SCOPE_SITE; 4319 4320 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags); 4321 if (!nlh) 4322 return -EMSGSIZE; 4323 4324 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 4325 if (nla_put_in6_addr(skb, IFA_ANYCAST, &ifaca->aca_addr) < 0 || 4326 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp, 4327 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 4328 nlmsg_cancel(skb, nlh); 4329 return -EMSGSIZE; 4330 } 4331 4332 nlmsg_end(skb, nlh); 4333 return 0; 4334 } 4335 4336 enum addr_type_t { 4337 UNICAST_ADDR, 4338 MULTICAST_ADDR, 4339 ANYCAST_ADDR, 4340 }; 4341 4342 /* called with rcu_read_lock() */ 4343 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb, 4344 struct netlink_callback *cb, enum addr_type_t type, 4345 int s_ip_idx, int *p_ip_idx) 4346 { 4347 struct ifmcaddr6 *ifmca; 4348 struct ifacaddr6 *ifaca; 4349 int err = 1; 4350 int ip_idx = *p_ip_idx; 4351 4352 read_lock_bh(&idev->lock); 4353 switch (type) { 4354 case UNICAST_ADDR: { 4355 struct inet6_ifaddr *ifa; 4356 4357 /* unicast address incl. temp addr */ 4358 list_for_each_entry(ifa, &idev->addr_list, if_list) { 4359 if (++ip_idx < s_ip_idx) 4360 continue; 4361 err = inet6_fill_ifaddr(skb, ifa, 4362 NETLINK_CB(cb->skb).portid, 4363 cb->nlh->nlmsg_seq, 4364 RTM_NEWADDR, 4365 NLM_F_MULTI); 4366 if (err < 0) 4367 break; 4368 nl_dump_check_consistent(cb, nlmsg_hdr(skb)); 4369 } 4370 break; 4371 } 4372 case MULTICAST_ADDR: 4373 /* multicast address */ 4374 for (ifmca = idev->mc_list; ifmca; 4375 ifmca = ifmca->next, ip_idx++) { 4376 if (ip_idx < s_ip_idx) 4377 continue; 4378 err = inet6_fill_ifmcaddr(skb, ifmca, 4379 NETLINK_CB(cb->skb).portid, 4380 cb->nlh->nlmsg_seq, 4381 RTM_GETMULTICAST, 4382 NLM_F_MULTI); 4383 if (err < 0) 4384 break; 4385 } 4386 break; 4387 case ANYCAST_ADDR: 4388 /* anycast address */ 4389 for (ifaca = idev->ac_list; ifaca; 4390 ifaca = ifaca->aca_next, ip_idx++) { 4391 if (ip_idx < s_ip_idx) 4392 continue; 4393 err = inet6_fill_ifacaddr(skb, ifaca, 4394 NETLINK_CB(cb->skb).portid, 4395 cb->nlh->nlmsg_seq, 4396 RTM_GETANYCAST, 4397 NLM_F_MULTI); 4398 if (err < 0) 4399 break; 4400 } 4401 break; 4402 default: 4403 break; 4404 } 4405 read_unlock_bh(&idev->lock); 4406 *p_ip_idx = ip_idx; 4407 return err; 4408 } 4409 4410 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb, 4411 enum addr_type_t type) 4412 { 4413 struct net *net = sock_net(skb->sk); 4414 int h, s_h; 4415 int idx, ip_idx; 4416 int s_idx, s_ip_idx; 4417 struct net_device *dev; 4418 struct inet6_dev *idev; 4419 struct hlist_head *head; 4420 4421 s_h = cb->args[0]; 4422 s_idx = idx = cb->args[1]; 4423 s_ip_idx = ip_idx = cb->args[2]; 4424 4425 rcu_read_lock(); 4426 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ net->dev_base_seq; 4427 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 4428 idx = 0; 4429 head = &net->dev_index_head[h]; 4430 hlist_for_each_entry_rcu(dev, head, index_hlist) { 4431 if (idx < s_idx) 4432 goto cont; 4433 if (h > s_h || idx > s_idx) 4434 s_ip_idx = 0; 4435 ip_idx = 0; 4436 idev = __in6_dev_get(dev); 4437 if (!idev) 4438 goto cont; 4439 4440 if (in6_dump_addrs(idev, skb, cb, type, 4441 s_ip_idx, &ip_idx) < 0) 4442 goto done; 4443 cont: 4444 idx++; 4445 } 4446 } 4447 done: 4448 rcu_read_unlock(); 4449 cb->args[0] = h; 4450 cb->args[1] = idx; 4451 cb->args[2] = ip_idx; 4452 4453 return skb->len; 4454 } 4455 4456 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb) 4457 { 4458 enum addr_type_t type = UNICAST_ADDR; 4459 4460 return inet6_dump_addr(skb, cb, type); 4461 } 4462 4463 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb) 4464 { 4465 enum addr_type_t type = MULTICAST_ADDR; 4466 4467 return inet6_dump_addr(skb, cb, type); 4468 } 4469 4470 4471 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb) 4472 { 4473 enum addr_type_t type = ANYCAST_ADDR; 4474 4475 return inet6_dump_addr(skb, cb, type); 4476 } 4477 4478 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh) 4479 { 4480 struct net *net = sock_net(in_skb->sk); 4481 struct ifaddrmsg *ifm; 4482 struct nlattr *tb[IFA_MAX+1]; 4483 struct in6_addr *addr = NULL, *peer; 4484 struct net_device *dev = NULL; 4485 struct inet6_ifaddr *ifa; 4486 struct sk_buff *skb; 4487 int err; 4488 4489 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy); 4490 if (err < 0) 4491 goto errout; 4492 4493 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer); 4494 if (!addr) { 4495 err = -EINVAL; 4496 goto errout; 4497 } 4498 4499 ifm = nlmsg_data(nlh); 4500 if (ifm->ifa_index) 4501 dev = __dev_get_by_index(net, ifm->ifa_index); 4502 4503 ifa = ipv6_get_ifaddr(net, addr, dev, 1); 4504 if (!ifa) { 4505 err = -EADDRNOTAVAIL; 4506 goto errout; 4507 } 4508 4509 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL); 4510 if (!skb) { 4511 err = -ENOBUFS; 4512 goto errout_ifa; 4513 } 4514 4515 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).portid, 4516 nlh->nlmsg_seq, RTM_NEWADDR, 0); 4517 if (err < 0) { 4518 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 4519 WARN_ON(err == -EMSGSIZE); 4520 kfree_skb(skb); 4521 goto errout_ifa; 4522 } 4523 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid); 4524 errout_ifa: 4525 in6_ifa_put(ifa); 4526 errout: 4527 return err; 4528 } 4529 4530 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa) 4531 { 4532 struct sk_buff *skb; 4533 struct net *net = dev_net(ifa->idev->dev); 4534 int err = -ENOBUFS; 4535 4536 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC); 4537 if (!skb) 4538 goto errout; 4539 4540 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0); 4541 if (err < 0) { 4542 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 4543 WARN_ON(err == -EMSGSIZE); 4544 kfree_skb(skb); 4545 goto errout; 4546 } 4547 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC); 4548 return; 4549 errout: 4550 if (err < 0) 4551 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err); 4552 } 4553 4554 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf, 4555 __s32 *array, int bytes) 4556 { 4557 BUG_ON(bytes < (DEVCONF_MAX * 4)); 4558 4559 memset(array, 0, bytes); 4560 array[DEVCONF_FORWARDING] = cnf->forwarding; 4561 array[DEVCONF_HOPLIMIT] = cnf->hop_limit; 4562 array[DEVCONF_MTU6] = cnf->mtu6; 4563 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra; 4564 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects; 4565 array[DEVCONF_AUTOCONF] = cnf->autoconf; 4566 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits; 4567 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits; 4568 array[DEVCONF_RTR_SOLICIT_INTERVAL] = 4569 jiffies_to_msecs(cnf->rtr_solicit_interval); 4570 array[DEVCONF_RTR_SOLICIT_DELAY] = 4571 jiffies_to_msecs(cnf->rtr_solicit_delay); 4572 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version; 4573 array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] = 4574 jiffies_to_msecs(cnf->mldv1_unsolicited_report_interval); 4575 array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] = 4576 jiffies_to_msecs(cnf->mldv2_unsolicited_report_interval); 4577 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr; 4578 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft; 4579 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft; 4580 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry; 4581 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor; 4582 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses; 4583 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr; 4584 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo; 4585 #ifdef CONFIG_IPV6_ROUTER_PREF 4586 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref; 4587 array[DEVCONF_RTR_PROBE_INTERVAL] = 4588 jiffies_to_msecs(cnf->rtr_probe_interval); 4589 #ifdef CONFIG_IPV6_ROUTE_INFO 4590 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen; 4591 #endif 4592 #endif 4593 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp; 4594 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route; 4595 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 4596 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad; 4597 array[DEVCONF_USE_OPTIMISTIC] = cnf->use_optimistic; 4598 #endif 4599 #ifdef CONFIG_IPV6_MROUTE 4600 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding; 4601 #endif 4602 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6; 4603 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad; 4604 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao; 4605 array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify; 4606 array[DEVCONF_SUPPRESS_FRAG_NDISC] = cnf->suppress_frag_ndisc; 4607 array[DEVCONF_ACCEPT_RA_FROM_LOCAL] = cnf->accept_ra_from_local; 4608 array[DEVCONF_ACCEPT_RA_MTU] = cnf->accept_ra_mtu; 4609 /* we omit DEVCONF_STABLE_SECRET for now */ 4610 } 4611 4612 static inline size_t inet6_ifla6_size(void) 4613 { 4614 return nla_total_size(4) /* IFLA_INET6_FLAGS */ 4615 + nla_total_size(sizeof(struct ifla_cacheinfo)) 4616 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */ 4617 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */ 4618 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */ 4619 + nla_total_size(sizeof(struct in6_addr)); /* IFLA_INET6_TOKEN */ 4620 } 4621 4622 static inline size_t inet6_if_nlmsg_size(void) 4623 { 4624 return NLMSG_ALIGN(sizeof(struct ifinfomsg)) 4625 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */ 4626 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */ 4627 + nla_total_size(4) /* IFLA_MTU */ 4628 + nla_total_size(4) /* IFLA_LINK */ 4629 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */ 4630 } 4631 4632 static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib, 4633 int items, int bytes) 4634 { 4635 int i; 4636 int pad = bytes - sizeof(u64) * items; 4637 BUG_ON(pad < 0); 4638 4639 /* Use put_unaligned() because stats may not be aligned for u64. */ 4640 put_unaligned(items, &stats[0]); 4641 for (i = 1; i < items; i++) 4642 put_unaligned(atomic_long_read(&mib[i]), &stats[i]); 4643 4644 memset(&stats[items], 0, pad); 4645 } 4646 4647 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu *mib, 4648 int items, int bytes, size_t syncpoff) 4649 { 4650 int i; 4651 int pad = bytes - sizeof(u64) * items; 4652 BUG_ON(pad < 0); 4653 4654 /* Use put_unaligned() because stats may not be aligned for u64. */ 4655 put_unaligned(items, &stats[0]); 4656 for (i = 1; i < items; i++) 4657 put_unaligned(snmp_fold_field64(mib, i, syncpoff), &stats[i]); 4658 4659 memset(&stats[items], 0, pad); 4660 } 4661 4662 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype, 4663 int bytes) 4664 { 4665 switch (attrtype) { 4666 case IFLA_INET6_STATS: 4667 __snmp6_fill_stats64(stats, idev->stats.ipv6, 4668 IPSTATS_MIB_MAX, bytes, offsetof(struct ipstats_mib, syncp)); 4669 break; 4670 case IFLA_INET6_ICMP6STATS: 4671 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, ICMP6_MIB_MAX, bytes); 4672 break; 4673 } 4674 } 4675 4676 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev) 4677 { 4678 struct nlattr *nla; 4679 struct ifla_cacheinfo ci; 4680 4681 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags)) 4682 goto nla_put_failure; 4683 ci.max_reasm_len = IPV6_MAXPLEN; 4684 ci.tstamp = cstamp_delta(idev->tstamp); 4685 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time); 4686 ci.retrans_time = jiffies_to_msecs(NEIGH_VAR(idev->nd_parms, RETRANS_TIME)); 4687 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci)) 4688 goto nla_put_failure; 4689 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32)); 4690 if (!nla) 4691 goto nla_put_failure; 4692 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla)); 4693 4694 /* XXX - MC not implemented */ 4695 4696 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64)); 4697 if (!nla) 4698 goto nla_put_failure; 4699 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla)); 4700 4701 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64)); 4702 if (!nla) 4703 goto nla_put_failure; 4704 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla)); 4705 4706 nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr)); 4707 if (!nla) 4708 goto nla_put_failure; 4709 4710 if (nla_put_u8(skb, IFLA_INET6_ADDR_GEN_MODE, idev->addr_gen_mode)) 4711 goto nla_put_failure; 4712 4713 read_lock_bh(&idev->lock); 4714 memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla)); 4715 read_unlock_bh(&idev->lock); 4716 4717 return 0; 4718 4719 nla_put_failure: 4720 return -EMSGSIZE; 4721 } 4722 4723 static size_t inet6_get_link_af_size(const struct net_device *dev) 4724 { 4725 if (!__in6_dev_get(dev)) 4726 return 0; 4727 4728 return inet6_ifla6_size(); 4729 } 4730 4731 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev) 4732 { 4733 struct inet6_dev *idev = __in6_dev_get(dev); 4734 4735 if (!idev) 4736 return -ENODATA; 4737 4738 if (inet6_fill_ifla6_attrs(skb, idev) < 0) 4739 return -EMSGSIZE; 4740 4741 return 0; 4742 } 4743 4744 static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token) 4745 { 4746 struct inet6_ifaddr *ifp; 4747 struct net_device *dev = idev->dev; 4748 bool update_rs = false; 4749 struct in6_addr ll_addr; 4750 4751 ASSERT_RTNL(); 4752 4753 if (!token) 4754 return -EINVAL; 4755 if (ipv6_addr_any(token)) 4756 return -EINVAL; 4757 if (dev->flags & (IFF_LOOPBACK | IFF_NOARP)) 4758 return -EINVAL; 4759 if (!ipv6_accept_ra(idev)) 4760 return -EINVAL; 4761 if (idev->cnf.rtr_solicits <= 0) 4762 return -EINVAL; 4763 4764 write_lock_bh(&idev->lock); 4765 4766 BUILD_BUG_ON(sizeof(token->s6_addr) != 16); 4767 memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8); 4768 4769 write_unlock_bh(&idev->lock); 4770 4771 if (!idev->dead && (idev->if_flags & IF_READY) && 4772 !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE | 4773 IFA_F_OPTIMISTIC)) { 4774 4775 /* If we're not ready, then normal ifup will take care 4776 * of this. Otherwise, we need to request our rs here. 4777 */ 4778 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters); 4779 update_rs = true; 4780 } 4781 4782 write_lock_bh(&idev->lock); 4783 4784 if (update_rs) { 4785 idev->if_flags |= IF_RS_SENT; 4786 idev->rs_probes = 1; 4787 addrconf_mod_rs_timer(idev, idev->cnf.rtr_solicit_interval); 4788 } 4789 4790 /* Well, that's kinda nasty ... */ 4791 list_for_each_entry(ifp, &idev->addr_list, if_list) { 4792 spin_lock(&ifp->lock); 4793 if (ifp->tokenized) { 4794 ifp->valid_lft = 0; 4795 ifp->prefered_lft = 0; 4796 } 4797 spin_unlock(&ifp->lock); 4798 } 4799 4800 write_unlock_bh(&idev->lock); 4801 inet6_ifinfo_notify(RTM_NEWLINK, idev); 4802 addrconf_verify_rtnl(); 4803 return 0; 4804 } 4805 4806 static const struct nla_policy inet6_af_policy[IFLA_INET6_MAX + 1] = { 4807 [IFLA_INET6_ADDR_GEN_MODE] = { .type = NLA_U8 }, 4808 [IFLA_INET6_TOKEN] = { .len = sizeof(struct in6_addr) }, 4809 }; 4810 4811 static int inet6_validate_link_af(const struct net_device *dev, 4812 const struct nlattr *nla) 4813 { 4814 struct nlattr *tb[IFLA_INET6_MAX + 1]; 4815 4816 if (dev && !__in6_dev_get(dev)) 4817 return -EAFNOSUPPORT; 4818 4819 return nla_parse_nested(tb, IFLA_INET6_MAX, nla, inet6_af_policy); 4820 } 4821 4822 static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla) 4823 { 4824 int err = -EINVAL; 4825 struct inet6_dev *idev = __in6_dev_get(dev); 4826 struct nlattr *tb[IFLA_INET6_MAX + 1]; 4827 4828 if (!idev) 4829 return -EAFNOSUPPORT; 4830 4831 if (nla_parse_nested(tb, IFLA_INET6_MAX, nla, NULL) < 0) 4832 BUG(); 4833 4834 if (tb[IFLA_INET6_TOKEN]) { 4835 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN])); 4836 if (err) 4837 return err; 4838 } 4839 4840 if (tb[IFLA_INET6_ADDR_GEN_MODE]) { 4841 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]); 4842 4843 if (mode != IN6_ADDR_GEN_MODE_EUI64 && 4844 mode != IN6_ADDR_GEN_MODE_NONE && 4845 mode != IN6_ADDR_GEN_MODE_STABLE_PRIVACY) 4846 return -EINVAL; 4847 4848 if (mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY && 4849 !idev->cnf.stable_secret.initialized && 4850 !dev_net(dev)->ipv6.devconf_dflt->stable_secret.initialized) 4851 return -EINVAL; 4852 4853 idev->addr_gen_mode = mode; 4854 err = 0; 4855 } 4856 4857 return err; 4858 } 4859 4860 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev, 4861 u32 portid, u32 seq, int event, unsigned int flags) 4862 { 4863 struct net_device *dev = idev->dev; 4864 struct ifinfomsg *hdr; 4865 struct nlmsghdr *nlh; 4866 void *protoinfo; 4867 4868 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags); 4869 if (!nlh) 4870 return -EMSGSIZE; 4871 4872 hdr = nlmsg_data(nlh); 4873 hdr->ifi_family = AF_INET6; 4874 hdr->__ifi_pad = 0; 4875 hdr->ifi_type = dev->type; 4876 hdr->ifi_index = dev->ifindex; 4877 hdr->ifi_flags = dev_get_flags(dev); 4878 hdr->ifi_change = 0; 4879 4880 if (nla_put_string(skb, IFLA_IFNAME, dev->name) || 4881 (dev->addr_len && 4882 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) || 4883 nla_put_u32(skb, IFLA_MTU, dev->mtu) || 4884 (dev->ifindex != dev_get_iflink(dev) && 4885 nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev)))) 4886 goto nla_put_failure; 4887 protoinfo = nla_nest_start(skb, IFLA_PROTINFO); 4888 if (!protoinfo) 4889 goto nla_put_failure; 4890 4891 if (inet6_fill_ifla6_attrs(skb, idev) < 0) 4892 goto nla_put_failure; 4893 4894 nla_nest_end(skb, protoinfo); 4895 nlmsg_end(skb, nlh); 4896 return 0; 4897 4898 nla_put_failure: 4899 nlmsg_cancel(skb, nlh); 4900 return -EMSGSIZE; 4901 } 4902 4903 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb) 4904 { 4905 struct net *net = sock_net(skb->sk); 4906 int h, s_h; 4907 int idx = 0, s_idx; 4908 struct net_device *dev; 4909 struct inet6_dev *idev; 4910 struct hlist_head *head; 4911 4912 s_h = cb->args[0]; 4913 s_idx = cb->args[1]; 4914 4915 rcu_read_lock(); 4916 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 4917 idx = 0; 4918 head = &net->dev_index_head[h]; 4919 hlist_for_each_entry_rcu(dev, head, index_hlist) { 4920 if (idx < s_idx) 4921 goto cont; 4922 idev = __in6_dev_get(dev); 4923 if (!idev) 4924 goto cont; 4925 if (inet6_fill_ifinfo(skb, idev, 4926 NETLINK_CB(cb->skb).portid, 4927 cb->nlh->nlmsg_seq, 4928 RTM_NEWLINK, NLM_F_MULTI) < 0) 4929 goto out; 4930 cont: 4931 idx++; 4932 } 4933 } 4934 out: 4935 rcu_read_unlock(); 4936 cb->args[1] = idx; 4937 cb->args[0] = h; 4938 4939 return skb->len; 4940 } 4941 4942 void inet6_ifinfo_notify(int event, struct inet6_dev *idev) 4943 { 4944 struct sk_buff *skb; 4945 struct net *net = dev_net(idev->dev); 4946 int err = -ENOBUFS; 4947 4948 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC); 4949 if (!skb) 4950 goto errout; 4951 4952 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0); 4953 if (err < 0) { 4954 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */ 4955 WARN_ON(err == -EMSGSIZE); 4956 kfree_skb(skb); 4957 goto errout; 4958 } 4959 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC); 4960 return; 4961 errout: 4962 if (err < 0) 4963 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err); 4964 } 4965 4966 static inline size_t inet6_prefix_nlmsg_size(void) 4967 { 4968 return NLMSG_ALIGN(sizeof(struct prefixmsg)) 4969 + nla_total_size(sizeof(struct in6_addr)) 4970 + nla_total_size(sizeof(struct prefix_cacheinfo)); 4971 } 4972 4973 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev, 4974 struct prefix_info *pinfo, u32 portid, u32 seq, 4975 int event, unsigned int flags) 4976 { 4977 struct prefixmsg *pmsg; 4978 struct nlmsghdr *nlh; 4979 struct prefix_cacheinfo ci; 4980 4981 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags); 4982 if (!nlh) 4983 return -EMSGSIZE; 4984 4985 pmsg = nlmsg_data(nlh); 4986 pmsg->prefix_family = AF_INET6; 4987 pmsg->prefix_pad1 = 0; 4988 pmsg->prefix_pad2 = 0; 4989 pmsg->prefix_ifindex = idev->dev->ifindex; 4990 pmsg->prefix_len = pinfo->prefix_len; 4991 pmsg->prefix_type = pinfo->type; 4992 pmsg->prefix_pad3 = 0; 4993 pmsg->prefix_flags = 0; 4994 if (pinfo->onlink) 4995 pmsg->prefix_flags |= IF_PREFIX_ONLINK; 4996 if (pinfo->autoconf) 4997 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF; 4998 4999 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix)) 5000 goto nla_put_failure; 5001 ci.preferred_time = ntohl(pinfo->prefered); 5002 ci.valid_time = ntohl(pinfo->valid); 5003 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci)) 5004 goto nla_put_failure; 5005 nlmsg_end(skb, nlh); 5006 return 0; 5007 5008 nla_put_failure: 5009 nlmsg_cancel(skb, nlh); 5010 return -EMSGSIZE; 5011 } 5012 5013 static void inet6_prefix_notify(int event, struct inet6_dev *idev, 5014 struct prefix_info *pinfo) 5015 { 5016 struct sk_buff *skb; 5017 struct net *net = dev_net(idev->dev); 5018 int err = -ENOBUFS; 5019 5020 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC); 5021 if (!skb) 5022 goto errout; 5023 5024 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0); 5025 if (err < 0) { 5026 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */ 5027 WARN_ON(err == -EMSGSIZE); 5028 kfree_skb(skb); 5029 goto errout; 5030 } 5031 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC); 5032 return; 5033 errout: 5034 if (err < 0) 5035 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err); 5036 } 5037 5038 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 5039 { 5040 struct net *net = dev_net(ifp->idev->dev); 5041 5042 if (event) 5043 ASSERT_RTNL(); 5044 5045 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp); 5046 5047 switch (event) { 5048 case RTM_NEWADDR: 5049 /* 5050 * If the address was optimistic 5051 * we inserted the route at the start of 5052 * our DAD process, so we don't need 5053 * to do it again 5054 */ 5055 if (!(ifp->rt->rt6i_node)) 5056 ip6_ins_rt(ifp->rt); 5057 if (ifp->idev->cnf.forwarding) 5058 addrconf_join_anycast(ifp); 5059 if (!ipv6_addr_any(&ifp->peer_addr)) 5060 addrconf_prefix_route(&ifp->peer_addr, 128, 5061 ifp->idev->dev, 0, 0); 5062 break; 5063 case RTM_DELADDR: 5064 if (ifp->idev->cnf.forwarding) 5065 addrconf_leave_anycast(ifp); 5066 addrconf_leave_solict(ifp->idev, &ifp->addr); 5067 if (!ipv6_addr_any(&ifp->peer_addr)) { 5068 struct rt6_info *rt; 5069 5070 rt = addrconf_get_prefix_route(&ifp->peer_addr, 128, 5071 ifp->idev->dev, 0, 0); 5072 if (rt && ip6_del_rt(rt)) 5073 dst_free(&rt->dst); 5074 } 5075 dst_hold(&ifp->rt->dst); 5076 5077 if (ip6_del_rt(ifp->rt)) 5078 dst_free(&ifp->rt->dst); 5079 5080 rt_genid_bump_ipv6(net); 5081 break; 5082 } 5083 atomic_inc(&net->ipv6.dev_addr_genid); 5084 } 5085 5086 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 5087 { 5088 rcu_read_lock_bh(); 5089 if (likely(ifp->idev->dead == 0)) 5090 __ipv6_ifa_notify(event, ifp); 5091 rcu_read_unlock_bh(); 5092 } 5093 5094 #ifdef CONFIG_SYSCTL 5095 5096 static 5097 int addrconf_sysctl_forward(struct ctl_table *ctl, int write, 5098 void __user *buffer, size_t *lenp, loff_t *ppos) 5099 { 5100 int *valp = ctl->data; 5101 int val = *valp; 5102 loff_t pos = *ppos; 5103 struct ctl_table lctl; 5104 int ret; 5105 5106 /* 5107 * ctl->data points to idev->cnf.forwarding, we should 5108 * not modify it until we get the rtnl lock. 5109 */ 5110 lctl = *ctl; 5111 lctl.data = &val; 5112 5113 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 5114 5115 if (write) 5116 ret = addrconf_fixup_forwarding(ctl, valp, val); 5117 if (ret) 5118 *ppos = pos; 5119 return ret; 5120 } 5121 5122 static 5123 int addrconf_sysctl_mtu(struct ctl_table *ctl, int write, 5124 void __user *buffer, size_t *lenp, loff_t *ppos) 5125 { 5126 struct inet6_dev *idev = ctl->extra1; 5127 int min_mtu = IPV6_MIN_MTU; 5128 struct ctl_table lctl; 5129 5130 lctl = *ctl; 5131 lctl.extra1 = &min_mtu; 5132 lctl.extra2 = idev ? &idev->dev->mtu : NULL; 5133 5134 return proc_dointvec_minmax(&lctl, write, buffer, lenp, ppos); 5135 } 5136 5137 static void dev_disable_change(struct inet6_dev *idev) 5138 { 5139 struct netdev_notifier_info info; 5140 5141 if (!idev || !idev->dev) 5142 return; 5143 5144 netdev_notifier_info_init(&info, idev->dev); 5145 if (idev->cnf.disable_ipv6) 5146 addrconf_notify(NULL, NETDEV_DOWN, &info); 5147 else 5148 addrconf_notify(NULL, NETDEV_UP, &info); 5149 } 5150 5151 static void addrconf_disable_change(struct net *net, __s32 newf) 5152 { 5153 struct net_device *dev; 5154 struct inet6_dev *idev; 5155 5156 rcu_read_lock(); 5157 for_each_netdev_rcu(net, dev) { 5158 idev = __in6_dev_get(dev); 5159 if (idev) { 5160 int changed = (!idev->cnf.disable_ipv6) ^ (!newf); 5161 idev->cnf.disable_ipv6 = newf; 5162 if (changed) 5163 dev_disable_change(idev); 5164 } 5165 } 5166 rcu_read_unlock(); 5167 } 5168 5169 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf) 5170 { 5171 struct net *net; 5172 int old; 5173 5174 if (!rtnl_trylock()) 5175 return restart_syscall(); 5176 5177 net = (struct net *)table->extra2; 5178 old = *p; 5179 *p = newf; 5180 5181 if (p == &net->ipv6.devconf_dflt->disable_ipv6) { 5182 rtnl_unlock(); 5183 return 0; 5184 } 5185 5186 if (p == &net->ipv6.devconf_all->disable_ipv6) { 5187 net->ipv6.devconf_dflt->disable_ipv6 = newf; 5188 addrconf_disable_change(net, newf); 5189 } else if ((!newf) ^ (!old)) 5190 dev_disable_change((struct inet6_dev *)table->extra1); 5191 5192 rtnl_unlock(); 5193 return 0; 5194 } 5195 5196 static 5197 int addrconf_sysctl_disable(struct ctl_table *ctl, int write, 5198 void __user *buffer, size_t *lenp, loff_t *ppos) 5199 { 5200 int *valp = ctl->data; 5201 int val = *valp; 5202 loff_t pos = *ppos; 5203 struct ctl_table lctl; 5204 int ret; 5205 5206 /* 5207 * ctl->data points to idev->cnf.disable_ipv6, we should 5208 * not modify it until we get the rtnl lock. 5209 */ 5210 lctl = *ctl; 5211 lctl.data = &val; 5212 5213 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 5214 5215 if (write) 5216 ret = addrconf_disable_ipv6(ctl, valp, val); 5217 if (ret) 5218 *ppos = pos; 5219 return ret; 5220 } 5221 5222 static 5223 int addrconf_sysctl_proxy_ndp(struct ctl_table *ctl, int write, 5224 void __user *buffer, size_t *lenp, loff_t *ppos) 5225 { 5226 int *valp = ctl->data; 5227 int ret; 5228 int old, new; 5229 5230 old = *valp; 5231 ret = proc_dointvec(ctl, write, buffer, lenp, ppos); 5232 new = *valp; 5233 5234 if (write && old != new) { 5235 struct net *net = ctl->extra2; 5236 5237 if (!rtnl_trylock()) 5238 return restart_syscall(); 5239 5240 if (valp == &net->ipv6.devconf_dflt->proxy_ndp) 5241 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH, 5242 NETCONFA_IFINDEX_DEFAULT, 5243 net->ipv6.devconf_dflt); 5244 else if (valp == &net->ipv6.devconf_all->proxy_ndp) 5245 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH, 5246 NETCONFA_IFINDEX_ALL, 5247 net->ipv6.devconf_all); 5248 else { 5249 struct inet6_dev *idev = ctl->extra1; 5250 5251 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH, 5252 idev->dev->ifindex, 5253 &idev->cnf); 5254 } 5255 rtnl_unlock(); 5256 } 5257 5258 return ret; 5259 } 5260 5261 static int addrconf_sysctl_stable_secret(struct ctl_table *ctl, int write, 5262 void __user *buffer, size_t *lenp, 5263 loff_t *ppos) 5264 { 5265 int err; 5266 struct in6_addr addr; 5267 char str[IPV6_MAX_STRLEN]; 5268 struct ctl_table lctl = *ctl; 5269 struct net *net = ctl->extra2; 5270 struct ipv6_stable_secret *secret = ctl->data; 5271 5272 if (&net->ipv6.devconf_all->stable_secret == ctl->data) 5273 return -EIO; 5274 5275 lctl.maxlen = IPV6_MAX_STRLEN; 5276 lctl.data = str; 5277 5278 if (!rtnl_trylock()) 5279 return restart_syscall(); 5280 5281 if (!write && !secret->initialized) { 5282 err = -EIO; 5283 goto out; 5284 } 5285 5286 if (!write) { 5287 err = snprintf(str, sizeof(str), "%pI6", 5288 &secret->secret); 5289 if (err >= sizeof(str)) { 5290 err = -EIO; 5291 goto out; 5292 } 5293 } 5294 5295 err = proc_dostring(&lctl, write, buffer, lenp, ppos); 5296 if (err || !write) 5297 goto out; 5298 5299 if (in6_pton(str, -1, addr.in6_u.u6_addr8, -1, NULL) != 1) { 5300 err = -EIO; 5301 goto out; 5302 } 5303 5304 secret->initialized = true; 5305 secret->secret = addr; 5306 5307 if (&net->ipv6.devconf_dflt->stable_secret == ctl->data) { 5308 struct net_device *dev; 5309 5310 for_each_netdev(net, dev) { 5311 struct inet6_dev *idev = __in6_dev_get(dev); 5312 5313 if (idev) { 5314 idev->addr_gen_mode = 5315 IN6_ADDR_GEN_MODE_STABLE_PRIVACY; 5316 } 5317 } 5318 } else { 5319 struct inet6_dev *idev = ctl->extra1; 5320 5321 idev->addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY; 5322 } 5323 5324 out: 5325 rtnl_unlock(); 5326 5327 return err; 5328 } 5329 5330 static struct addrconf_sysctl_table 5331 { 5332 struct ctl_table_header *sysctl_header; 5333 struct ctl_table addrconf_vars[DEVCONF_MAX+1]; 5334 } addrconf_sysctl __read_mostly = { 5335 .sysctl_header = NULL, 5336 .addrconf_vars = { 5337 { 5338 .procname = "forwarding", 5339 .data = &ipv6_devconf.forwarding, 5340 .maxlen = sizeof(int), 5341 .mode = 0644, 5342 .proc_handler = addrconf_sysctl_forward, 5343 }, 5344 { 5345 .procname = "hop_limit", 5346 .data = &ipv6_devconf.hop_limit, 5347 .maxlen = sizeof(int), 5348 .mode = 0644, 5349 .proc_handler = proc_dointvec, 5350 }, 5351 { 5352 .procname = "mtu", 5353 .data = &ipv6_devconf.mtu6, 5354 .maxlen = sizeof(int), 5355 .mode = 0644, 5356 .proc_handler = addrconf_sysctl_mtu, 5357 }, 5358 { 5359 .procname = "accept_ra", 5360 .data = &ipv6_devconf.accept_ra, 5361 .maxlen = sizeof(int), 5362 .mode = 0644, 5363 .proc_handler = proc_dointvec, 5364 }, 5365 { 5366 .procname = "accept_redirects", 5367 .data = &ipv6_devconf.accept_redirects, 5368 .maxlen = sizeof(int), 5369 .mode = 0644, 5370 .proc_handler = proc_dointvec, 5371 }, 5372 { 5373 .procname = "autoconf", 5374 .data = &ipv6_devconf.autoconf, 5375 .maxlen = sizeof(int), 5376 .mode = 0644, 5377 .proc_handler = proc_dointvec, 5378 }, 5379 { 5380 .procname = "dad_transmits", 5381 .data = &ipv6_devconf.dad_transmits, 5382 .maxlen = sizeof(int), 5383 .mode = 0644, 5384 .proc_handler = proc_dointvec, 5385 }, 5386 { 5387 .procname = "router_solicitations", 5388 .data = &ipv6_devconf.rtr_solicits, 5389 .maxlen = sizeof(int), 5390 .mode = 0644, 5391 .proc_handler = proc_dointvec, 5392 }, 5393 { 5394 .procname = "router_solicitation_interval", 5395 .data = &ipv6_devconf.rtr_solicit_interval, 5396 .maxlen = sizeof(int), 5397 .mode = 0644, 5398 .proc_handler = proc_dointvec_jiffies, 5399 }, 5400 { 5401 .procname = "router_solicitation_delay", 5402 .data = &ipv6_devconf.rtr_solicit_delay, 5403 .maxlen = sizeof(int), 5404 .mode = 0644, 5405 .proc_handler = proc_dointvec_jiffies, 5406 }, 5407 { 5408 .procname = "force_mld_version", 5409 .data = &ipv6_devconf.force_mld_version, 5410 .maxlen = sizeof(int), 5411 .mode = 0644, 5412 .proc_handler = proc_dointvec, 5413 }, 5414 { 5415 .procname = "mldv1_unsolicited_report_interval", 5416 .data = 5417 &ipv6_devconf.mldv1_unsolicited_report_interval, 5418 .maxlen = sizeof(int), 5419 .mode = 0644, 5420 .proc_handler = proc_dointvec_ms_jiffies, 5421 }, 5422 { 5423 .procname = "mldv2_unsolicited_report_interval", 5424 .data = 5425 &ipv6_devconf.mldv2_unsolicited_report_interval, 5426 .maxlen = sizeof(int), 5427 .mode = 0644, 5428 .proc_handler = proc_dointvec_ms_jiffies, 5429 }, 5430 { 5431 .procname = "use_tempaddr", 5432 .data = &ipv6_devconf.use_tempaddr, 5433 .maxlen = sizeof(int), 5434 .mode = 0644, 5435 .proc_handler = proc_dointvec, 5436 }, 5437 { 5438 .procname = "temp_valid_lft", 5439 .data = &ipv6_devconf.temp_valid_lft, 5440 .maxlen = sizeof(int), 5441 .mode = 0644, 5442 .proc_handler = proc_dointvec, 5443 }, 5444 { 5445 .procname = "temp_prefered_lft", 5446 .data = &ipv6_devconf.temp_prefered_lft, 5447 .maxlen = sizeof(int), 5448 .mode = 0644, 5449 .proc_handler = proc_dointvec, 5450 }, 5451 { 5452 .procname = "regen_max_retry", 5453 .data = &ipv6_devconf.regen_max_retry, 5454 .maxlen = sizeof(int), 5455 .mode = 0644, 5456 .proc_handler = proc_dointvec, 5457 }, 5458 { 5459 .procname = "max_desync_factor", 5460 .data = &ipv6_devconf.max_desync_factor, 5461 .maxlen = sizeof(int), 5462 .mode = 0644, 5463 .proc_handler = proc_dointvec, 5464 }, 5465 { 5466 .procname = "max_addresses", 5467 .data = &ipv6_devconf.max_addresses, 5468 .maxlen = sizeof(int), 5469 .mode = 0644, 5470 .proc_handler = proc_dointvec, 5471 }, 5472 { 5473 .procname = "accept_ra_defrtr", 5474 .data = &ipv6_devconf.accept_ra_defrtr, 5475 .maxlen = sizeof(int), 5476 .mode = 0644, 5477 .proc_handler = proc_dointvec, 5478 }, 5479 { 5480 .procname = "accept_ra_pinfo", 5481 .data = &ipv6_devconf.accept_ra_pinfo, 5482 .maxlen = sizeof(int), 5483 .mode = 0644, 5484 .proc_handler = proc_dointvec, 5485 }, 5486 #ifdef CONFIG_IPV6_ROUTER_PREF 5487 { 5488 .procname = "accept_ra_rtr_pref", 5489 .data = &ipv6_devconf.accept_ra_rtr_pref, 5490 .maxlen = sizeof(int), 5491 .mode = 0644, 5492 .proc_handler = proc_dointvec, 5493 }, 5494 { 5495 .procname = "router_probe_interval", 5496 .data = &ipv6_devconf.rtr_probe_interval, 5497 .maxlen = sizeof(int), 5498 .mode = 0644, 5499 .proc_handler = proc_dointvec_jiffies, 5500 }, 5501 #ifdef CONFIG_IPV6_ROUTE_INFO 5502 { 5503 .procname = "accept_ra_rt_info_max_plen", 5504 .data = &ipv6_devconf.accept_ra_rt_info_max_plen, 5505 .maxlen = sizeof(int), 5506 .mode = 0644, 5507 .proc_handler = proc_dointvec, 5508 }, 5509 #endif 5510 #endif 5511 { 5512 .procname = "proxy_ndp", 5513 .data = &ipv6_devconf.proxy_ndp, 5514 .maxlen = sizeof(int), 5515 .mode = 0644, 5516 .proc_handler = addrconf_sysctl_proxy_ndp, 5517 }, 5518 { 5519 .procname = "accept_source_route", 5520 .data = &ipv6_devconf.accept_source_route, 5521 .maxlen = sizeof(int), 5522 .mode = 0644, 5523 .proc_handler = proc_dointvec, 5524 }, 5525 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 5526 { 5527 .procname = "optimistic_dad", 5528 .data = &ipv6_devconf.optimistic_dad, 5529 .maxlen = sizeof(int), 5530 .mode = 0644, 5531 .proc_handler = proc_dointvec, 5532 5533 }, 5534 { 5535 .procname = "use_optimistic", 5536 .data = &ipv6_devconf.use_optimistic, 5537 .maxlen = sizeof(int), 5538 .mode = 0644, 5539 .proc_handler = proc_dointvec, 5540 5541 }, 5542 #endif 5543 #ifdef CONFIG_IPV6_MROUTE 5544 { 5545 .procname = "mc_forwarding", 5546 .data = &ipv6_devconf.mc_forwarding, 5547 .maxlen = sizeof(int), 5548 .mode = 0444, 5549 .proc_handler = proc_dointvec, 5550 }, 5551 #endif 5552 { 5553 .procname = "disable_ipv6", 5554 .data = &ipv6_devconf.disable_ipv6, 5555 .maxlen = sizeof(int), 5556 .mode = 0644, 5557 .proc_handler = addrconf_sysctl_disable, 5558 }, 5559 { 5560 .procname = "accept_dad", 5561 .data = &ipv6_devconf.accept_dad, 5562 .maxlen = sizeof(int), 5563 .mode = 0644, 5564 .proc_handler = proc_dointvec, 5565 }, 5566 { 5567 .procname = "force_tllao", 5568 .data = &ipv6_devconf.force_tllao, 5569 .maxlen = sizeof(int), 5570 .mode = 0644, 5571 .proc_handler = proc_dointvec 5572 }, 5573 { 5574 .procname = "ndisc_notify", 5575 .data = &ipv6_devconf.ndisc_notify, 5576 .maxlen = sizeof(int), 5577 .mode = 0644, 5578 .proc_handler = proc_dointvec 5579 }, 5580 { 5581 .procname = "suppress_frag_ndisc", 5582 .data = &ipv6_devconf.suppress_frag_ndisc, 5583 .maxlen = sizeof(int), 5584 .mode = 0644, 5585 .proc_handler = proc_dointvec 5586 }, 5587 { 5588 .procname = "accept_ra_from_local", 5589 .data = &ipv6_devconf.accept_ra_from_local, 5590 .maxlen = sizeof(int), 5591 .mode = 0644, 5592 .proc_handler = proc_dointvec, 5593 }, 5594 { 5595 .procname = "accept_ra_mtu", 5596 .data = &ipv6_devconf.accept_ra_mtu, 5597 .maxlen = sizeof(int), 5598 .mode = 0644, 5599 .proc_handler = proc_dointvec, 5600 }, 5601 { 5602 .procname = "stable_secret", 5603 .data = &ipv6_devconf.stable_secret, 5604 .maxlen = IPV6_MAX_STRLEN, 5605 .mode = 0600, 5606 .proc_handler = addrconf_sysctl_stable_secret, 5607 }, 5608 { 5609 /* sentinel */ 5610 } 5611 }, 5612 }; 5613 5614 static int __addrconf_sysctl_register(struct net *net, char *dev_name, 5615 struct inet6_dev *idev, struct ipv6_devconf *p) 5616 { 5617 int i; 5618 struct addrconf_sysctl_table *t; 5619 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ]; 5620 5621 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL); 5622 if (!t) 5623 goto out; 5624 5625 for (i = 0; t->addrconf_vars[i].data; i++) { 5626 t->addrconf_vars[i].data += (char *)p - (char *)&ipv6_devconf; 5627 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */ 5628 t->addrconf_vars[i].extra2 = net; 5629 } 5630 5631 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name); 5632 5633 t->sysctl_header = register_net_sysctl(net, path, t->addrconf_vars); 5634 if (!t->sysctl_header) 5635 goto free; 5636 5637 p->sysctl = t; 5638 return 0; 5639 5640 free: 5641 kfree(t); 5642 out: 5643 return -ENOBUFS; 5644 } 5645 5646 static void __addrconf_sysctl_unregister(struct ipv6_devconf *p) 5647 { 5648 struct addrconf_sysctl_table *t; 5649 5650 if (!p->sysctl) 5651 return; 5652 5653 t = p->sysctl; 5654 p->sysctl = NULL; 5655 unregister_net_sysctl_table(t->sysctl_header); 5656 kfree(t); 5657 } 5658 5659 static int addrconf_sysctl_register(struct inet6_dev *idev) 5660 { 5661 int err; 5662 5663 if (!sysctl_dev_name_is_allowed(idev->dev->name)) 5664 return -EINVAL; 5665 5666 err = neigh_sysctl_register(idev->dev, idev->nd_parms, 5667 &ndisc_ifinfo_sysctl_change); 5668 if (err) 5669 return err; 5670 err = __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name, 5671 idev, &idev->cnf); 5672 if (err) 5673 neigh_sysctl_unregister(idev->nd_parms); 5674 5675 return err; 5676 } 5677 5678 static void addrconf_sysctl_unregister(struct inet6_dev *idev) 5679 { 5680 __addrconf_sysctl_unregister(&idev->cnf); 5681 neigh_sysctl_unregister(idev->nd_parms); 5682 } 5683 5684 5685 #endif 5686 5687 static int __net_init addrconf_init_net(struct net *net) 5688 { 5689 int err = -ENOMEM; 5690 struct ipv6_devconf *all, *dflt; 5691 5692 all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL); 5693 if (!all) 5694 goto err_alloc_all; 5695 5696 dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL); 5697 if (!dflt) 5698 goto err_alloc_dflt; 5699 5700 /* these will be inherited by all namespaces */ 5701 dflt->autoconf = ipv6_defaults.autoconf; 5702 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6; 5703 5704 dflt->stable_secret.initialized = false; 5705 all->stable_secret.initialized = false; 5706 5707 net->ipv6.devconf_all = all; 5708 net->ipv6.devconf_dflt = dflt; 5709 5710 #ifdef CONFIG_SYSCTL 5711 err = __addrconf_sysctl_register(net, "all", NULL, all); 5712 if (err < 0) 5713 goto err_reg_all; 5714 5715 err = __addrconf_sysctl_register(net, "default", NULL, dflt); 5716 if (err < 0) 5717 goto err_reg_dflt; 5718 #endif 5719 return 0; 5720 5721 #ifdef CONFIG_SYSCTL 5722 err_reg_dflt: 5723 __addrconf_sysctl_unregister(all); 5724 err_reg_all: 5725 kfree(dflt); 5726 #endif 5727 err_alloc_dflt: 5728 kfree(all); 5729 err_alloc_all: 5730 return err; 5731 } 5732 5733 static void __net_exit addrconf_exit_net(struct net *net) 5734 { 5735 #ifdef CONFIG_SYSCTL 5736 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt); 5737 __addrconf_sysctl_unregister(net->ipv6.devconf_all); 5738 #endif 5739 kfree(net->ipv6.devconf_dflt); 5740 kfree(net->ipv6.devconf_all); 5741 } 5742 5743 static struct pernet_operations addrconf_ops = { 5744 .init = addrconf_init_net, 5745 .exit = addrconf_exit_net, 5746 }; 5747 5748 static struct rtnl_af_ops inet6_ops __read_mostly = { 5749 .family = AF_INET6, 5750 .fill_link_af = inet6_fill_link_af, 5751 .get_link_af_size = inet6_get_link_af_size, 5752 .validate_link_af = inet6_validate_link_af, 5753 .set_link_af = inet6_set_link_af, 5754 }; 5755 5756 /* 5757 * Init / cleanup code 5758 */ 5759 5760 int __init addrconf_init(void) 5761 { 5762 struct inet6_dev *idev; 5763 int i, err; 5764 5765 err = ipv6_addr_label_init(); 5766 if (err < 0) { 5767 pr_crit("%s: cannot initialize default policy table: %d\n", 5768 __func__, err); 5769 goto out; 5770 } 5771 5772 err = register_pernet_subsys(&addrconf_ops); 5773 if (err < 0) 5774 goto out_addrlabel; 5775 5776 addrconf_wq = create_workqueue("ipv6_addrconf"); 5777 if (!addrconf_wq) { 5778 err = -ENOMEM; 5779 goto out_nowq; 5780 } 5781 5782 /* The addrconf netdev notifier requires that loopback_dev 5783 * has it's ipv6 private information allocated and setup 5784 * before it can bring up and give link-local addresses 5785 * to other devices which are up. 5786 * 5787 * Unfortunately, loopback_dev is not necessarily the first 5788 * entry in the global dev_base list of net devices. In fact, 5789 * it is likely to be the very last entry on that list. 5790 * So this causes the notifier registry below to try and 5791 * give link-local addresses to all devices besides loopback_dev 5792 * first, then loopback_dev, which cases all the non-loopback_dev 5793 * devices to fail to get a link-local address. 5794 * 5795 * So, as a temporary fix, allocate the ipv6 structure for 5796 * loopback_dev first by hand. 5797 * Longer term, all of the dependencies ipv6 has upon the loopback 5798 * device and it being up should be removed. 5799 */ 5800 rtnl_lock(); 5801 idev = ipv6_add_dev(init_net.loopback_dev); 5802 rtnl_unlock(); 5803 if (IS_ERR(idev)) { 5804 err = PTR_ERR(idev); 5805 goto errlo; 5806 } 5807 5808 for (i = 0; i < IN6_ADDR_HSIZE; i++) 5809 INIT_HLIST_HEAD(&inet6_addr_lst[i]); 5810 5811 register_netdevice_notifier(&ipv6_dev_notf); 5812 5813 addrconf_verify(); 5814 5815 rtnl_af_register(&inet6_ops); 5816 5817 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo, 5818 NULL); 5819 if (err < 0) 5820 goto errout; 5821 5822 /* Only the first call to __rtnl_register can fail */ 5823 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL, NULL); 5824 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL, NULL); 5825 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr, 5826 inet6_dump_ifaddr, NULL); 5827 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL, 5828 inet6_dump_ifmcaddr, NULL); 5829 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL, 5830 inet6_dump_ifacaddr, NULL); 5831 __rtnl_register(PF_INET6, RTM_GETNETCONF, inet6_netconf_get_devconf, 5832 inet6_netconf_dump_devconf, NULL); 5833 5834 ipv6_addr_label_rtnl_register(); 5835 5836 return 0; 5837 errout: 5838 rtnl_af_unregister(&inet6_ops); 5839 unregister_netdevice_notifier(&ipv6_dev_notf); 5840 errlo: 5841 destroy_workqueue(addrconf_wq); 5842 out_nowq: 5843 unregister_pernet_subsys(&addrconf_ops); 5844 out_addrlabel: 5845 ipv6_addr_label_cleanup(); 5846 out: 5847 return err; 5848 } 5849 5850 void addrconf_cleanup(void) 5851 { 5852 struct net_device *dev; 5853 int i; 5854 5855 unregister_netdevice_notifier(&ipv6_dev_notf); 5856 unregister_pernet_subsys(&addrconf_ops); 5857 ipv6_addr_label_cleanup(); 5858 5859 rtnl_lock(); 5860 5861 __rtnl_af_unregister(&inet6_ops); 5862 5863 /* clean dev list */ 5864 for_each_netdev(&init_net, dev) { 5865 if (__in6_dev_get(dev) == NULL) 5866 continue; 5867 addrconf_ifdown(dev, 1); 5868 } 5869 addrconf_ifdown(init_net.loopback_dev, 2); 5870 5871 /* 5872 * Check hash table. 5873 */ 5874 spin_lock_bh(&addrconf_hash_lock); 5875 for (i = 0; i < IN6_ADDR_HSIZE; i++) 5876 WARN_ON(!hlist_empty(&inet6_addr_lst[i])); 5877 spin_unlock_bh(&addrconf_hash_lock); 5878 cancel_delayed_work(&addr_chk_work); 5879 rtnl_unlock(); 5880 5881 destroy_workqueue(addrconf_wq); 5882 } 5883