1 /* 2 * IPv6 Address [auto]configuration 3 * Linux INET6 implementation 4 * 5 * Authors: 6 * Pedro Roque <roque@di.fc.ul.pt> 7 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru> 8 * 9 * This program is free software; you can redistribute it and/or 10 * modify it under the terms of the GNU General Public License 11 * as published by the Free Software Foundation; either version 12 * 2 of the License, or (at your option) any later version. 13 */ 14 15 /* 16 * Changes: 17 * 18 * Janos Farkas : delete timer on ifdown 19 * <chexum@bankinf.banki.hu> 20 * Andi Kleen : kill double kfree on module 21 * unload. 22 * Maciej W. Rozycki : FDDI support 23 * sekiya@USAGI : Don't send too many RS 24 * packets. 25 * yoshfuji@USAGI : Fixed interval between DAD 26 * packets. 27 * YOSHIFUJI Hideaki @USAGI : improved accuracy of 28 * address validation timer. 29 * YOSHIFUJI Hideaki @USAGI : Privacy Extensions (RFC3041) 30 * support. 31 * Yuji SEKIYA @USAGI : Don't assign a same IPv6 32 * address on a same interface. 33 * YOSHIFUJI Hideaki @USAGI : ARCnet support 34 * YOSHIFUJI Hideaki @USAGI : convert /proc/net/if_inet6 to 35 * seq_file. 36 * YOSHIFUJI Hideaki @USAGI : improved source address 37 * selection; consider scope, 38 * status etc. 39 */ 40 41 #define pr_fmt(fmt) "IPv6: " fmt 42 43 #include <linux/errno.h> 44 #include <linux/types.h> 45 #include <linux/kernel.h> 46 #include <linux/socket.h> 47 #include <linux/sockios.h> 48 #include <linux/net.h> 49 #include <linux/in6.h> 50 #include <linux/netdevice.h> 51 #include <linux/if_addr.h> 52 #include <linux/if_arp.h> 53 #include <linux/if_arcnet.h> 54 #include <linux/if_infiniband.h> 55 #include <linux/route.h> 56 #include <linux/inetdevice.h> 57 #include <linux/init.h> 58 #include <linux/slab.h> 59 #ifdef CONFIG_SYSCTL 60 #include <linux/sysctl.h> 61 #endif 62 #include <linux/capability.h> 63 #include <linux/delay.h> 64 #include <linux/notifier.h> 65 #include <linux/string.h> 66 #include <linux/hash.h> 67 68 #include <net/net_namespace.h> 69 #include <net/sock.h> 70 #include <net/snmp.h> 71 72 #include <net/af_ieee802154.h> 73 #include <net/firewire.h> 74 #include <net/ipv6.h> 75 #include <net/protocol.h> 76 #include <net/ndisc.h> 77 #include <net/ip6_route.h> 78 #include <net/addrconf.h> 79 #include <net/tcp.h> 80 #include <net/ip.h> 81 #include <net/netlink.h> 82 #include <net/pkt_sched.h> 83 #include <linux/if_tunnel.h> 84 #include <linux/rtnetlink.h> 85 #include <linux/netconf.h> 86 87 #ifdef CONFIG_IPV6_PRIVACY 88 #include <linux/random.h> 89 #endif 90 91 #include <linux/uaccess.h> 92 #include <asm/unaligned.h> 93 94 #include <linux/proc_fs.h> 95 #include <linux/seq_file.h> 96 #include <linux/export.h> 97 98 /* Set to 3 to get tracing... */ 99 #define ACONF_DEBUG 2 100 101 #if ACONF_DEBUG >= 3 102 #define ADBG(fmt, ...) printk(fmt, ##__VA_ARGS__) 103 #else 104 #define ADBG(fmt, ...) do { if (0) printk(fmt, ##__VA_ARGS__); } while (0) 105 #endif 106 107 #define INFINITY_LIFE_TIME 0xFFFFFFFF 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 void addrconf_sysctl_register(struct inet6_dev *idev); 116 static void addrconf_sysctl_unregister(struct inet6_dev *idev); 117 #else 118 static inline void addrconf_sysctl_register(struct inet6_dev *idev) 119 { 120 } 121 122 static inline void addrconf_sysctl_unregister(struct inet6_dev *idev) 123 { 124 } 125 #endif 126 127 #ifdef CONFIG_IPV6_PRIVACY 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 #endif 132 133 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev); 134 static int ipv6_count_addresses(struct inet6_dev *idev); 135 136 /* 137 * Configured unicast address hash table 138 */ 139 static struct hlist_head inet6_addr_lst[IN6_ADDR_HSIZE]; 140 static DEFINE_SPINLOCK(addrconf_hash_lock); 141 142 static void addrconf_verify(unsigned long); 143 144 static DEFINE_TIMER(addr_chk_timer, addrconf_verify, 0, 0); 145 static DEFINE_SPINLOCK(addrconf_verify_lock); 146 147 static void addrconf_join_anycast(struct inet6_ifaddr *ifp); 148 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp); 149 150 static void addrconf_type_change(struct net_device *dev, 151 unsigned long event); 152 static int addrconf_ifdown(struct net_device *dev, int how); 153 154 static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx, 155 int plen, 156 const struct net_device *dev, 157 u32 flags, u32 noflags); 158 159 static void addrconf_dad_start(struct inet6_ifaddr *ifp); 160 static void addrconf_dad_timer(unsigned long data); 161 static void addrconf_dad_completed(struct inet6_ifaddr *ifp); 162 static void addrconf_dad_run(struct inet6_dev *idev); 163 static void addrconf_rs_timer(unsigned long data); 164 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa); 165 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa); 166 167 static void inet6_prefix_notify(int event, struct inet6_dev *idev, 168 struct prefix_info *pinfo); 169 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr, 170 struct net_device *dev); 171 172 static struct ipv6_devconf ipv6_devconf __read_mostly = { 173 .forwarding = 0, 174 .hop_limit = IPV6_DEFAULT_HOPLIMIT, 175 .mtu6 = IPV6_MIN_MTU, 176 .accept_ra = 1, 177 .accept_redirects = 1, 178 .autoconf = 1, 179 .force_mld_version = 0, 180 .mldv1_unsolicited_report_interval = 10 * HZ, 181 .mldv2_unsolicited_report_interval = HZ, 182 .dad_transmits = 1, 183 .rtr_solicits = MAX_RTR_SOLICITATIONS, 184 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL, 185 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY, 186 #ifdef CONFIG_IPV6_PRIVACY 187 .use_tempaddr = 0, 188 .temp_valid_lft = TEMP_VALID_LIFETIME, 189 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME, 190 .regen_max_retry = REGEN_MAX_RETRY, 191 .max_desync_factor = MAX_DESYNC_FACTOR, 192 #endif 193 .max_addresses = IPV6_MAX_ADDRESSES, 194 .accept_ra_defrtr = 1, 195 .accept_ra_pinfo = 1, 196 #ifdef CONFIG_IPV6_ROUTER_PREF 197 .accept_ra_rtr_pref = 1, 198 .rtr_probe_interval = 60 * HZ, 199 #ifdef CONFIG_IPV6_ROUTE_INFO 200 .accept_ra_rt_info_max_plen = 0, 201 #endif 202 #endif 203 .proxy_ndp = 0, 204 .accept_source_route = 0, /* we do not accept RH0 by default. */ 205 .disable_ipv6 = 0, 206 .accept_dad = 1, 207 .suppress_frag_ndisc = 1, 208 }; 209 210 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = { 211 .forwarding = 0, 212 .hop_limit = IPV6_DEFAULT_HOPLIMIT, 213 .mtu6 = IPV6_MIN_MTU, 214 .accept_ra = 1, 215 .accept_redirects = 1, 216 .autoconf = 1, 217 .force_mld_version = 0, 218 .mldv1_unsolicited_report_interval = 10 * HZ, 219 .mldv2_unsolicited_report_interval = HZ, 220 .dad_transmits = 1, 221 .rtr_solicits = MAX_RTR_SOLICITATIONS, 222 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL, 223 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY, 224 #ifdef CONFIG_IPV6_PRIVACY 225 .use_tempaddr = 0, 226 .temp_valid_lft = TEMP_VALID_LIFETIME, 227 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME, 228 .regen_max_retry = REGEN_MAX_RETRY, 229 .max_desync_factor = MAX_DESYNC_FACTOR, 230 #endif 231 .max_addresses = IPV6_MAX_ADDRESSES, 232 .accept_ra_defrtr = 1, 233 .accept_ra_pinfo = 1, 234 #ifdef CONFIG_IPV6_ROUTER_PREF 235 .accept_ra_rtr_pref = 1, 236 .rtr_probe_interval = 60 * HZ, 237 #ifdef CONFIG_IPV6_ROUTE_INFO 238 .accept_ra_rt_info_max_plen = 0, 239 #endif 240 #endif 241 .proxy_ndp = 0, 242 .accept_source_route = 0, /* we do not accept RH0 by default. */ 243 .disable_ipv6 = 0, 244 .accept_dad = 1, 245 .suppress_frag_ndisc = 1, 246 }; 247 248 /* Check if a valid qdisc is available */ 249 static inline bool addrconf_qdisc_ok(const struct net_device *dev) 250 { 251 return !qdisc_tx_is_noop(dev); 252 } 253 254 static void addrconf_del_rs_timer(struct inet6_dev *idev) 255 { 256 if (del_timer(&idev->rs_timer)) 257 __in6_dev_put(idev); 258 } 259 260 static void addrconf_del_dad_timer(struct inet6_ifaddr *ifp) 261 { 262 if (del_timer(&ifp->dad_timer)) 263 __in6_ifa_put(ifp); 264 } 265 266 static void addrconf_mod_rs_timer(struct inet6_dev *idev, 267 unsigned long when) 268 { 269 if (!timer_pending(&idev->rs_timer)) 270 in6_dev_hold(idev); 271 mod_timer(&idev->rs_timer, jiffies + when); 272 } 273 274 static void addrconf_mod_dad_timer(struct inet6_ifaddr *ifp, 275 unsigned long when) 276 { 277 if (!timer_pending(&ifp->dad_timer)) 278 in6_ifa_hold(ifp); 279 mod_timer(&ifp->dad_timer, jiffies + when); 280 } 281 282 static int snmp6_alloc_dev(struct inet6_dev *idev) 283 { 284 if (snmp_mib_init((void __percpu **)idev->stats.ipv6, 285 sizeof(struct ipstats_mib), 286 __alignof__(struct ipstats_mib)) < 0) 287 goto err_ip; 288 idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device), 289 GFP_KERNEL); 290 if (!idev->stats.icmpv6dev) 291 goto err_icmp; 292 idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device), 293 GFP_KERNEL); 294 if (!idev->stats.icmpv6msgdev) 295 goto err_icmpmsg; 296 297 return 0; 298 299 err_icmpmsg: 300 kfree(idev->stats.icmpv6dev); 301 err_icmp: 302 snmp_mib_free((void __percpu **)idev->stats.ipv6); 303 err_ip: 304 return -ENOMEM; 305 } 306 307 static struct inet6_dev *ipv6_add_dev(struct net_device *dev) 308 { 309 struct inet6_dev *ndev; 310 311 ASSERT_RTNL(); 312 313 if (dev->mtu < IPV6_MIN_MTU) 314 return NULL; 315 316 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL); 317 318 if (ndev == NULL) 319 return NULL; 320 321 rwlock_init(&ndev->lock); 322 ndev->dev = dev; 323 INIT_LIST_HEAD(&ndev->addr_list); 324 setup_timer(&ndev->rs_timer, addrconf_rs_timer, 325 (unsigned long)ndev); 326 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf)); 327 ndev->cnf.mtu6 = dev->mtu; 328 ndev->cnf.sysctl = NULL; 329 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl); 330 if (ndev->nd_parms == NULL) { 331 kfree(ndev); 332 return NULL; 333 } 334 if (ndev->cnf.forwarding) 335 dev_disable_lro(dev); 336 /* We refer to the device */ 337 dev_hold(dev); 338 339 if (snmp6_alloc_dev(ndev) < 0) { 340 ADBG(KERN_WARNING 341 "%s: cannot allocate memory for statistics; dev=%s.\n", 342 __func__, dev->name); 343 neigh_parms_release(&nd_tbl, ndev->nd_parms); 344 dev_put(dev); 345 kfree(ndev); 346 return NULL; 347 } 348 349 if (snmp6_register_dev(ndev) < 0) { 350 ADBG(KERN_WARNING 351 "%s: cannot create /proc/net/dev_snmp6/%s\n", 352 __func__, dev->name); 353 neigh_parms_release(&nd_tbl, ndev->nd_parms); 354 ndev->dead = 1; 355 in6_dev_finish_destroy(ndev); 356 return NULL; 357 } 358 359 /* One reference from device. We must do this before 360 * we invoke __ipv6_regen_rndid(). 361 */ 362 in6_dev_hold(ndev); 363 364 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK)) 365 ndev->cnf.accept_dad = -1; 366 367 #if IS_ENABLED(CONFIG_IPV6_SIT) 368 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) { 369 pr_info("%s: Disabled Multicast RS\n", dev->name); 370 ndev->cnf.rtr_solicits = 0; 371 } 372 #endif 373 374 #ifdef CONFIG_IPV6_PRIVACY 375 INIT_LIST_HEAD(&ndev->tempaddr_list); 376 setup_timer(&ndev->regen_timer, ipv6_regen_rndid, (unsigned long)ndev); 377 if ((dev->flags&IFF_LOOPBACK) || 378 dev->type == ARPHRD_TUNNEL || 379 dev->type == ARPHRD_TUNNEL6 || 380 dev->type == ARPHRD_SIT || 381 dev->type == ARPHRD_NONE) { 382 ndev->cnf.use_tempaddr = -1; 383 } else { 384 in6_dev_hold(ndev); 385 ipv6_regen_rndid((unsigned long) ndev); 386 } 387 #endif 388 ndev->token = in6addr_any; 389 390 if (netif_running(dev) && addrconf_qdisc_ok(dev)) 391 ndev->if_flags |= IF_READY; 392 393 ipv6_mc_init_dev(ndev); 394 ndev->tstamp = jiffies; 395 addrconf_sysctl_register(ndev); 396 /* protected by rtnl_lock */ 397 rcu_assign_pointer(dev->ip6_ptr, ndev); 398 399 /* Join interface-local all-node multicast group */ 400 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allnodes); 401 402 /* Join all-node multicast group */ 403 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes); 404 405 /* Join all-router multicast group if forwarding is set */ 406 if (ndev->cnf.forwarding && (dev->flags & IFF_MULTICAST)) 407 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters); 408 409 return ndev; 410 } 411 412 static struct inet6_dev *ipv6_find_idev(struct net_device *dev) 413 { 414 struct inet6_dev *idev; 415 416 ASSERT_RTNL(); 417 418 idev = __in6_dev_get(dev); 419 if (!idev) { 420 idev = ipv6_add_dev(dev); 421 if (!idev) 422 return NULL; 423 } 424 425 if (dev->flags&IFF_UP) 426 ipv6_mc_up(idev); 427 return idev; 428 } 429 430 static int inet6_netconf_msgsize_devconf(int type) 431 { 432 int size = NLMSG_ALIGN(sizeof(struct netconfmsg)) 433 + nla_total_size(4); /* NETCONFA_IFINDEX */ 434 435 /* type -1 is used for ALL */ 436 if (type == -1 || type == NETCONFA_FORWARDING) 437 size += nla_total_size(4); 438 #ifdef CONFIG_IPV6_MROUTE 439 if (type == -1 || type == NETCONFA_MC_FORWARDING) 440 size += nla_total_size(4); 441 #endif 442 443 return size; 444 } 445 446 static int inet6_netconf_fill_devconf(struct sk_buff *skb, int ifindex, 447 struct ipv6_devconf *devconf, u32 portid, 448 u32 seq, int event, unsigned int flags, 449 int type) 450 { 451 struct nlmsghdr *nlh; 452 struct netconfmsg *ncm; 453 454 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg), 455 flags); 456 if (nlh == NULL) 457 return -EMSGSIZE; 458 459 ncm = nlmsg_data(nlh); 460 ncm->ncm_family = AF_INET6; 461 462 if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0) 463 goto nla_put_failure; 464 465 /* type -1 is used for ALL */ 466 if ((type == -1 || type == NETCONFA_FORWARDING) && 467 nla_put_s32(skb, NETCONFA_FORWARDING, devconf->forwarding) < 0) 468 goto nla_put_failure; 469 #ifdef CONFIG_IPV6_MROUTE 470 if ((type == -1 || type == NETCONFA_MC_FORWARDING) && 471 nla_put_s32(skb, NETCONFA_MC_FORWARDING, 472 devconf->mc_forwarding) < 0) 473 goto nla_put_failure; 474 #endif 475 return nlmsg_end(skb, nlh); 476 477 nla_put_failure: 478 nlmsg_cancel(skb, nlh); 479 return -EMSGSIZE; 480 } 481 482 void inet6_netconf_notify_devconf(struct net *net, int type, int ifindex, 483 struct ipv6_devconf *devconf) 484 { 485 struct sk_buff *skb; 486 int err = -ENOBUFS; 487 488 skb = nlmsg_new(inet6_netconf_msgsize_devconf(type), GFP_ATOMIC); 489 if (skb == NULL) 490 goto errout; 491 492 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 0, 0, 493 RTM_NEWNETCONF, 0, type); 494 if (err < 0) { 495 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */ 496 WARN_ON(err == -EMSGSIZE); 497 kfree_skb(skb); 498 goto errout; 499 } 500 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_NETCONF, NULL, GFP_ATOMIC); 501 return; 502 errout: 503 rtnl_set_sk_err(net, RTNLGRP_IPV6_NETCONF, err); 504 } 505 506 static const struct nla_policy devconf_ipv6_policy[NETCONFA_MAX+1] = { 507 [NETCONFA_IFINDEX] = { .len = sizeof(int) }, 508 [NETCONFA_FORWARDING] = { .len = sizeof(int) }, 509 }; 510 511 static int inet6_netconf_get_devconf(struct sk_buff *in_skb, 512 struct nlmsghdr *nlh) 513 { 514 struct net *net = sock_net(in_skb->sk); 515 struct nlattr *tb[NETCONFA_MAX+1]; 516 struct netconfmsg *ncm; 517 struct sk_buff *skb; 518 struct ipv6_devconf *devconf; 519 struct inet6_dev *in6_dev; 520 struct net_device *dev; 521 int ifindex; 522 int err; 523 524 err = nlmsg_parse(nlh, sizeof(*ncm), tb, NETCONFA_MAX, 525 devconf_ipv6_policy); 526 if (err < 0) 527 goto errout; 528 529 err = EINVAL; 530 if (!tb[NETCONFA_IFINDEX]) 531 goto errout; 532 533 ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]); 534 switch (ifindex) { 535 case NETCONFA_IFINDEX_ALL: 536 devconf = net->ipv6.devconf_all; 537 break; 538 case NETCONFA_IFINDEX_DEFAULT: 539 devconf = net->ipv6.devconf_dflt; 540 break; 541 default: 542 dev = __dev_get_by_index(net, ifindex); 543 if (dev == NULL) 544 goto errout; 545 in6_dev = __in6_dev_get(dev); 546 if (in6_dev == NULL) 547 goto errout; 548 devconf = &in6_dev->cnf; 549 break; 550 } 551 552 err = -ENOBUFS; 553 skb = nlmsg_new(inet6_netconf_msgsize_devconf(-1), GFP_ATOMIC); 554 if (skb == NULL) 555 goto errout; 556 557 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 558 NETLINK_CB(in_skb).portid, 559 nlh->nlmsg_seq, RTM_NEWNETCONF, 0, 560 -1); 561 if (err < 0) { 562 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */ 563 WARN_ON(err == -EMSGSIZE); 564 kfree_skb(skb); 565 goto errout; 566 } 567 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid); 568 errout: 569 return err; 570 } 571 572 static int inet6_netconf_dump_devconf(struct sk_buff *skb, 573 struct netlink_callback *cb) 574 { 575 struct net *net = sock_net(skb->sk); 576 int h, s_h; 577 int idx, s_idx; 578 struct net_device *dev; 579 struct inet6_dev *idev; 580 struct hlist_head *head; 581 582 s_h = cb->args[0]; 583 s_idx = idx = cb->args[1]; 584 585 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 586 idx = 0; 587 head = &net->dev_index_head[h]; 588 rcu_read_lock(); 589 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ 590 net->dev_base_seq; 591 hlist_for_each_entry_rcu(dev, head, index_hlist) { 592 if (idx < s_idx) 593 goto cont; 594 idev = __in6_dev_get(dev); 595 if (!idev) 596 goto cont; 597 598 if (inet6_netconf_fill_devconf(skb, dev->ifindex, 599 &idev->cnf, 600 NETLINK_CB(cb->skb).portid, 601 cb->nlh->nlmsg_seq, 602 RTM_NEWNETCONF, 603 NLM_F_MULTI, 604 -1) <= 0) { 605 rcu_read_unlock(); 606 goto done; 607 } 608 nl_dump_check_consistent(cb, nlmsg_hdr(skb)); 609 cont: 610 idx++; 611 } 612 rcu_read_unlock(); 613 } 614 if (h == NETDEV_HASHENTRIES) { 615 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL, 616 net->ipv6.devconf_all, 617 NETLINK_CB(cb->skb).portid, 618 cb->nlh->nlmsg_seq, 619 RTM_NEWNETCONF, NLM_F_MULTI, 620 -1) <= 0) 621 goto done; 622 else 623 h++; 624 } 625 if (h == NETDEV_HASHENTRIES + 1) { 626 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT, 627 net->ipv6.devconf_dflt, 628 NETLINK_CB(cb->skb).portid, 629 cb->nlh->nlmsg_seq, 630 RTM_NEWNETCONF, NLM_F_MULTI, 631 -1) <= 0) 632 goto done; 633 else 634 h++; 635 } 636 done: 637 cb->args[0] = h; 638 cb->args[1] = idx; 639 640 return skb->len; 641 } 642 643 #ifdef CONFIG_SYSCTL 644 static void dev_forward_change(struct inet6_dev *idev) 645 { 646 struct net_device *dev; 647 struct inet6_ifaddr *ifa; 648 649 if (!idev) 650 return; 651 dev = idev->dev; 652 if (idev->cnf.forwarding) 653 dev_disable_lro(dev); 654 if (dev->flags & IFF_MULTICAST) { 655 if (idev->cnf.forwarding) { 656 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters); 657 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allrouters); 658 ipv6_dev_mc_inc(dev, &in6addr_sitelocal_allrouters); 659 } else { 660 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters); 661 ipv6_dev_mc_dec(dev, &in6addr_interfacelocal_allrouters); 662 ipv6_dev_mc_dec(dev, &in6addr_sitelocal_allrouters); 663 } 664 } 665 666 list_for_each_entry(ifa, &idev->addr_list, if_list) { 667 if (ifa->flags&IFA_F_TENTATIVE) 668 continue; 669 if (idev->cnf.forwarding) 670 addrconf_join_anycast(ifa); 671 else 672 addrconf_leave_anycast(ifa); 673 } 674 inet6_netconf_notify_devconf(dev_net(dev), NETCONFA_FORWARDING, 675 dev->ifindex, &idev->cnf); 676 } 677 678 679 static void addrconf_forward_change(struct net *net, __s32 newf) 680 { 681 struct net_device *dev; 682 struct inet6_dev *idev; 683 684 for_each_netdev(net, dev) { 685 idev = __in6_dev_get(dev); 686 if (idev) { 687 int changed = (!idev->cnf.forwarding) ^ (!newf); 688 idev->cnf.forwarding = newf; 689 if (changed) 690 dev_forward_change(idev); 691 } 692 } 693 } 694 695 static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf) 696 { 697 struct net *net; 698 int old; 699 700 if (!rtnl_trylock()) 701 return restart_syscall(); 702 703 net = (struct net *)table->extra2; 704 old = *p; 705 *p = newf; 706 707 if (p == &net->ipv6.devconf_dflt->forwarding) { 708 if ((!newf) ^ (!old)) 709 inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING, 710 NETCONFA_IFINDEX_DEFAULT, 711 net->ipv6.devconf_dflt); 712 rtnl_unlock(); 713 return 0; 714 } 715 716 if (p == &net->ipv6.devconf_all->forwarding) { 717 net->ipv6.devconf_dflt->forwarding = newf; 718 addrconf_forward_change(net, newf); 719 if ((!newf) ^ (!old)) 720 inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING, 721 NETCONFA_IFINDEX_ALL, 722 net->ipv6.devconf_all); 723 } else if ((!newf) ^ (!old)) 724 dev_forward_change((struct inet6_dev *)table->extra1); 725 rtnl_unlock(); 726 727 if (newf) 728 rt6_purge_dflt_routers(net); 729 return 1; 730 } 731 #endif 732 733 /* Nobody refers to this ifaddr, destroy it */ 734 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp) 735 { 736 WARN_ON(!hlist_unhashed(&ifp->addr_lst)); 737 738 #ifdef NET_REFCNT_DEBUG 739 pr_debug("%s\n", __func__); 740 #endif 741 742 in6_dev_put(ifp->idev); 743 744 if (del_timer(&ifp->dad_timer)) 745 pr_notice("Timer is still running, when freeing ifa=%p\n", ifp); 746 747 if (ifp->state != INET6_IFADDR_STATE_DEAD) { 748 pr_warn("Freeing alive inet6 address %p\n", ifp); 749 return; 750 } 751 ip6_rt_put(ifp->rt); 752 753 kfree_rcu(ifp, rcu); 754 } 755 756 static void 757 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp) 758 { 759 struct list_head *p; 760 int ifp_scope = ipv6_addr_src_scope(&ifp->addr); 761 762 /* 763 * Each device address list is sorted in order of scope - 764 * global before linklocal. 765 */ 766 list_for_each(p, &idev->addr_list) { 767 struct inet6_ifaddr *ifa 768 = list_entry(p, struct inet6_ifaddr, if_list); 769 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr)) 770 break; 771 } 772 773 list_add_tail(&ifp->if_list, p); 774 } 775 776 static u32 inet6_addr_hash(const struct in6_addr *addr) 777 { 778 return hash_32(ipv6_addr_hash(addr), IN6_ADDR_HSIZE_SHIFT); 779 } 780 781 /* On success it returns ifp with increased reference count */ 782 783 static struct inet6_ifaddr * 784 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, 785 const struct in6_addr *peer_addr, int pfxlen, 786 int scope, u32 flags, u32 valid_lft, u32 prefered_lft) 787 { 788 struct inet6_ifaddr *ifa = NULL; 789 struct rt6_info *rt; 790 unsigned int hash; 791 int err = 0; 792 int addr_type = ipv6_addr_type(addr); 793 794 if (addr_type == IPV6_ADDR_ANY || 795 addr_type & IPV6_ADDR_MULTICAST || 796 (!(idev->dev->flags & IFF_LOOPBACK) && 797 addr_type & IPV6_ADDR_LOOPBACK)) 798 return ERR_PTR(-EADDRNOTAVAIL); 799 800 rcu_read_lock_bh(); 801 if (idev->dead) { 802 err = -ENODEV; /*XXX*/ 803 goto out2; 804 } 805 806 if (idev->cnf.disable_ipv6) { 807 err = -EACCES; 808 goto out2; 809 } 810 811 spin_lock(&addrconf_hash_lock); 812 813 /* Ignore adding duplicate addresses on an interface */ 814 if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) { 815 ADBG("ipv6_add_addr: already assigned\n"); 816 err = -EEXIST; 817 goto out; 818 } 819 820 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC); 821 822 if (ifa == NULL) { 823 ADBG("ipv6_add_addr: malloc failed\n"); 824 err = -ENOBUFS; 825 goto out; 826 } 827 828 rt = addrconf_dst_alloc(idev, addr, false); 829 if (IS_ERR(rt)) { 830 err = PTR_ERR(rt); 831 goto out; 832 } 833 834 ifa->addr = *addr; 835 if (peer_addr) 836 ifa->peer_addr = *peer_addr; 837 838 spin_lock_init(&ifa->lock); 839 spin_lock_init(&ifa->state_lock); 840 setup_timer(&ifa->dad_timer, addrconf_dad_timer, 841 (unsigned long)ifa); 842 INIT_HLIST_NODE(&ifa->addr_lst); 843 ifa->scope = scope; 844 ifa->prefix_len = pfxlen; 845 ifa->flags = flags | IFA_F_TENTATIVE; 846 ifa->valid_lft = valid_lft; 847 ifa->prefered_lft = prefered_lft; 848 ifa->cstamp = ifa->tstamp = jiffies; 849 ifa->tokenized = false; 850 851 ifa->rt = rt; 852 853 ifa->idev = idev; 854 in6_dev_hold(idev); 855 /* For caller */ 856 in6_ifa_hold(ifa); 857 858 /* Add to big hash table */ 859 hash = inet6_addr_hash(addr); 860 861 hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]); 862 spin_unlock(&addrconf_hash_lock); 863 864 write_lock(&idev->lock); 865 /* Add to inet6_dev unicast addr list. */ 866 ipv6_link_dev_addr(idev, ifa); 867 868 #ifdef CONFIG_IPV6_PRIVACY 869 if (ifa->flags&IFA_F_TEMPORARY) { 870 list_add(&ifa->tmp_list, &idev->tempaddr_list); 871 in6_ifa_hold(ifa); 872 } 873 #endif 874 875 in6_ifa_hold(ifa); 876 write_unlock(&idev->lock); 877 out2: 878 rcu_read_unlock_bh(); 879 880 if (likely(err == 0)) 881 inet6addr_notifier_call_chain(NETDEV_UP, ifa); 882 else { 883 kfree(ifa); 884 ifa = ERR_PTR(err); 885 } 886 887 return ifa; 888 out: 889 spin_unlock(&addrconf_hash_lock); 890 goto out2; 891 } 892 893 /* This function wants to get referenced ifp and releases it before return */ 894 895 static void ipv6_del_addr(struct inet6_ifaddr *ifp) 896 { 897 struct inet6_ifaddr *ifa, *ifn; 898 struct inet6_dev *idev = ifp->idev; 899 int state; 900 int deleted = 0, onlink = 0; 901 unsigned long expires = jiffies; 902 903 spin_lock_bh(&ifp->state_lock); 904 state = ifp->state; 905 ifp->state = INET6_IFADDR_STATE_DEAD; 906 spin_unlock_bh(&ifp->state_lock); 907 908 if (state == INET6_IFADDR_STATE_DEAD) 909 goto out; 910 911 spin_lock_bh(&addrconf_hash_lock); 912 hlist_del_init_rcu(&ifp->addr_lst); 913 spin_unlock_bh(&addrconf_hash_lock); 914 915 write_lock_bh(&idev->lock); 916 #ifdef CONFIG_IPV6_PRIVACY 917 if (ifp->flags&IFA_F_TEMPORARY) { 918 list_del(&ifp->tmp_list); 919 if (ifp->ifpub) { 920 in6_ifa_put(ifp->ifpub); 921 ifp->ifpub = NULL; 922 } 923 __in6_ifa_put(ifp); 924 } 925 #endif 926 927 list_for_each_entry_safe(ifa, ifn, &idev->addr_list, if_list) { 928 if (ifa == ifp) { 929 list_del_init(&ifp->if_list); 930 __in6_ifa_put(ifp); 931 932 if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0) 933 break; 934 deleted = 1; 935 continue; 936 } else if (ifp->flags & IFA_F_PERMANENT) { 937 if (ipv6_prefix_equal(&ifa->addr, &ifp->addr, 938 ifp->prefix_len)) { 939 if (ifa->flags & IFA_F_PERMANENT) { 940 onlink = 1; 941 if (deleted) 942 break; 943 } else { 944 unsigned long lifetime; 945 946 if (!onlink) 947 onlink = -1; 948 949 spin_lock(&ifa->lock); 950 951 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ); 952 /* 953 * Note: Because this address is 954 * not permanent, lifetime < 955 * LONG_MAX / HZ here. 956 */ 957 if (time_before(expires, 958 ifa->tstamp + lifetime * HZ)) 959 expires = ifa->tstamp + lifetime * HZ; 960 spin_unlock(&ifa->lock); 961 } 962 } 963 } 964 } 965 write_unlock_bh(&idev->lock); 966 967 addrconf_del_dad_timer(ifp); 968 969 ipv6_ifa_notify(RTM_DELADDR, ifp); 970 971 inet6addr_notifier_call_chain(NETDEV_DOWN, ifp); 972 973 /* 974 * Purge or update corresponding prefix 975 * 976 * 1) we don't purge prefix here if address was not permanent. 977 * prefix is managed by its own lifetime. 978 * 2) if there're no addresses, delete prefix. 979 * 3) if there're still other permanent address(es), 980 * corresponding prefix is still permanent. 981 * 4) otherwise, update prefix lifetime to the 982 * longest valid lifetime among the corresponding 983 * addresses on the device. 984 * Note: subsequent RA will update lifetime. 985 * 986 * --yoshfuji 987 */ 988 if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) { 989 struct in6_addr prefix; 990 struct rt6_info *rt; 991 992 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len); 993 994 rt = addrconf_get_prefix_route(&prefix, 995 ifp->prefix_len, 996 ifp->idev->dev, 997 0, RTF_GATEWAY | RTF_DEFAULT); 998 999 if (rt) { 1000 if (onlink == 0) { 1001 ip6_del_rt(rt); 1002 rt = NULL; 1003 } else if (!(rt->rt6i_flags & RTF_EXPIRES)) { 1004 rt6_set_expires(rt, expires); 1005 } 1006 } 1007 ip6_rt_put(rt); 1008 } 1009 1010 /* clean up prefsrc entries */ 1011 rt6_remove_prefsrc(ifp); 1012 out: 1013 in6_ifa_put(ifp); 1014 } 1015 1016 #ifdef CONFIG_IPV6_PRIVACY 1017 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift) 1018 { 1019 struct inet6_dev *idev = ifp->idev; 1020 struct in6_addr addr, *tmpaddr; 1021 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_tstamp, age; 1022 unsigned long regen_advance; 1023 int tmp_plen; 1024 int ret = 0; 1025 u32 addr_flags; 1026 unsigned long now = jiffies; 1027 1028 write_lock(&idev->lock); 1029 if (ift) { 1030 spin_lock_bh(&ift->lock); 1031 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8); 1032 spin_unlock_bh(&ift->lock); 1033 tmpaddr = &addr; 1034 } else { 1035 tmpaddr = NULL; 1036 } 1037 retry: 1038 in6_dev_hold(idev); 1039 if (idev->cnf.use_tempaddr <= 0) { 1040 write_unlock(&idev->lock); 1041 pr_info("%s: use_tempaddr is disabled\n", __func__); 1042 in6_dev_put(idev); 1043 ret = -1; 1044 goto out; 1045 } 1046 spin_lock_bh(&ifp->lock); 1047 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) { 1048 idev->cnf.use_tempaddr = -1; /*XXX*/ 1049 spin_unlock_bh(&ifp->lock); 1050 write_unlock(&idev->lock); 1051 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n", 1052 __func__); 1053 in6_dev_put(idev); 1054 ret = -1; 1055 goto out; 1056 } 1057 in6_ifa_hold(ifp); 1058 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8); 1059 __ipv6_try_regen_rndid(idev, tmpaddr); 1060 memcpy(&addr.s6_addr[8], idev->rndid, 8); 1061 age = (now - ifp->tstamp) / HZ; 1062 tmp_valid_lft = min_t(__u32, 1063 ifp->valid_lft, 1064 idev->cnf.temp_valid_lft + age); 1065 tmp_prefered_lft = min_t(__u32, 1066 ifp->prefered_lft, 1067 idev->cnf.temp_prefered_lft + age - 1068 idev->cnf.max_desync_factor); 1069 tmp_plen = ifp->prefix_len; 1070 tmp_tstamp = ifp->tstamp; 1071 spin_unlock_bh(&ifp->lock); 1072 1073 regen_advance = idev->cnf.regen_max_retry * 1074 idev->cnf.dad_transmits * 1075 idev->nd_parms->retrans_time / HZ; 1076 write_unlock(&idev->lock); 1077 1078 /* A temporary address is created only if this calculated Preferred 1079 * Lifetime is greater than REGEN_ADVANCE time units. In particular, 1080 * an implementation must not create a temporary address with a zero 1081 * Preferred Lifetime. 1082 */ 1083 if (tmp_prefered_lft <= regen_advance) { 1084 in6_ifa_put(ifp); 1085 in6_dev_put(idev); 1086 ret = -1; 1087 goto out; 1088 } 1089 1090 addr_flags = IFA_F_TEMPORARY; 1091 /* set in addrconf_prefix_rcv() */ 1092 if (ifp->flags & IFA_F_OPTIMISTIC) 1093 addr_flags |= IFA_F_OPTIMISTIC; 1094 1095 ift = ipv6_add_addr(idev, &addr, NULL, tmp_plen, 1096 ipv6_addr_scope(&addr), addr_flags, 1097 tmp_valid_lft, tmp_prefered_lft); 1098 if (IS_ERR(ift)) { 1099 in6_ifa_put(ifp); 1100 in6_dev_put(idev); 1101 pr_info("%s: retry temporary address regeneration\n", __func__); 1102 tmpaddr = &addr; 1103 write_lock(&idev->lock); 1104 goto retry; 1105 } 1106 1107 spin_lock_bh(&ift->lock); 1108 ift->ifpub = ifp; 1109 ift->cstamp = now; 1110 ift->tstamp = tmp_tstamp; 1111 spin_unlock_bh(&ift->lock); 1112 1113 addrconf_dad_start(ift); 1114 in6_ifa_put(ift); 1115 in6_dev_put(idev); 1116 out: 1117 return ret; 1118 } 1119 #endif 1120 1121 /* 1122 * Choose an appropriate source address (RFC3484) 1123 */ 1124 enum { 1125 IPV6_SADDR_RULE_INIT = 0, 1126 IPV6_SADDR_RULE_LOCAL, 1127 IPV6_SADDR_RULE_SCOPE, 1128 IPV6_SADDR_RULE_PREFERRED, 1129 #ifdef CONFIG_IPV6_MIP6 1130 IPV6_SADDR_RULE_HOA, 1131 #endif 1132 IPV6_SADDR_RULE_OIF, 1133 IPV6_SADDR_RULE_LABEL, 1134 #ifdef CONFIG_IPV6_PRIVACY 1135 IPV6_SADDR_RULE_PRIVACY, 1136 #endif 1137 IPV6_SADDR_RULE_ORCHID, 1138 IPV6_SADDR_RULE_PREFIX, 1139 IPV6_SADDR_RULE_MAX 1140 }; 1141 1142 struct ipv6_saddr_score { 1143 int rule; 1144 int addr_type; 1145 struct inet6_ifaddr *ifa; 1146 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX); 1147 int scopedist; 1148 int matchlen; 1149 }; 1150 1151 struct ipv6_saddr_dst { 1152 const struct in6_addr *addr; 1153 int ifindex; 1154 int scope; 1155 int label; 1156 unsigned int prefs; 1157 }; 1158 1159 static inline int ipv6_saddr_preferred(int type) 1160 { 1161 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK)) 1162 return 1; 1163 return 0; 1164 } 1165 1166 static int ipv6_get_saddr_eval(struct net *net, 1167 struct ipv6_saddr_score *score, 1168 struct ipv6_saddr_dst *dst, 1169 int i) 1170 { 1171 int ret; 1172 1173 if (i <= score->rule) { 1174 switch (i) { 1175 case IPV6_SADDR_RULE_SCOPE: 1176 ret = score->scopedist; 1177 break; 1178 case IPV6_SADDR_RULE_PREFIX: 1179 ret = score->matchlen; 1180 break; 1181 default: 1182 ret = !!test_bit(i, score->scorebits); 1183 } 1184 goto out; 1185 } 1186 1187 switch (i) { 1188 case IPV6_SADDR_RULE_INIT: 1189 /* Rule 0: remember if hiscore is not ready yet */ 1190 ret = !!score->ifa; 1191 break; 1192 case IPV6_SADDR_RULE_LOCAL: 1193 /* Rule 1: Prefer same address */ 1194 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr); 1195 break; 1196 case IPV6_SADDR_RULE_SCOPE: 1197 /* Rule 2: Prefer appropriate scope 1198 * 1199 * ret 1200 * ^ 1201 * -1 | d 15 1202 * ---+--+-+---> scope 1203 * | 1204 * | d is scope of the destination. 1205 * B-d | \ 1206 * | \ <- smaller scope is better if 1207 * B-15 | \ if scope is enough for destinaion. 1208 * | ret = B - scope (-1 <= scope >= d <= 15). 1209 * d-C-1 | / 1210 * |/ <- greater is better 1211 * -C / if scope is not enough for destination. 1212 * /| ret = scope - C (-1 <= d < scope <= 15). 1213 * 1214 * d - C - 1 < B -15 (for all -1 <= d <= 15). 1215 * C > d + 14 - B >= 15 + 14 - B = 29 - B. 1216 * Assume B = 0 and we get C > 29. 1217 */ 1218 ret = __ipv6_addr_src_scope(score->addr_type); 1219 if (ret >= dst->scope) 1220 ret = -ret; 1221 else 1222 ret -= 128; /* 30 is enough */ 1223 score->scopedist = ret; 1224 break; 1225 case IPV6_SADDR_RULE_PREFERRED: 1226 /* Rule 3: Avoid deprecated and optimistic addresses */ 1227 ret = ipv6_saddr_preferred(score->addr_type) || 1228 !(score->ifa->flags & (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC)); 1229 break; 1230 #ifdef CONFIG_IPV6_MIP6 1231 case IPV6_SADDR_RULE_HOA: 1232 { 1233 /* Rule 4: Prefer home address */ 1234 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA); 1235 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome; 1236 break; 1237 } 1238 #endif 1239 case IPV6_SADDR_RULE_OIF: 1240 /* Rule 5: Prefer outgoing interface */ 1241 ret = (!dst->ifindex || 1242 dst->ifindex == score->ifa->idev->dev->ifindex); 1243 break; 1244 case IPV6_SADDR_RULE_LABEL: 1245 /* Rule 6: Prefer matching label */ 1246 ret = ipv6_addr_label(net, 1247 &score->ifa->addr, score->addr_type, 1248 score->ifa->idev->dev->ifindex) == dst->label; 1249 break; 1250 #ifdef CONFIG_IPV6_PRIVACY 1251 case IPV6_SADDR_RULE_PRIVACY: 1252 { 1253 /* Rule 7: Prefer public address 1254 * Note: prefer temporary address if use_tempaddr >= 2 1255 */ 1256 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ? 1257 !!(dst->prefs & IPV6_PREFER_SRC_TMP) : 1258 score->ifa->idev->cnf.use_tempaddr >= 2; 1259 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp; 1260 break; 1261 } 1262 #endif 1263 case IPV6_SADDR_RULE_ORCHID: 1264 /* Rule 8-: Prefer ORCHID vs ORCHID or 1265 * non-ORCHID vs non-ORCHID 1266 */ 1267 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^ 1268 ipv6_addr_orchid(dst->addr)); 1269 break; 1270 case IPV6_SADDR_RULE_PREFIX: 1271 /* Rule 8: Use longest matching prefix */ 1272 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr); 1273 if (ret > score->ifa->prefix_len) 1274 ret = score->ifa->prefix_len; 1275 score->matchlen = ret; 1276 break; 1277 default: 1278 ret = 0; 1279 } 1280 1281 if (ret) 1282 __set_bit(i, score->scorebits); 1283 score->rule = i; 1284 out: 1285 return ret; 1286 } 1287 1288 int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev, 1289 const struct in6_addr *daddr, unsigned int prefs, 1290 struct in6_addr *saddr) 1291 { 1292 struct ipv6_saddr_score scores[2], 1293 *score = &scores[0], *hiscore = &scores[1]; 1294 struct ipv6_saddr_dst dst; 1295 struct net_device *dev; 1296 int dst_type; 1297 1298 dst_type = __ipv6_addr_type(daddr); 1299 dst.addr = daddr; 1300 dst.ifindex = dst_dev ? dst_dev->ifindex : 0; 1301 dst.scope = __ipv6_addr_src_scope(dst_type); 1302 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex); 1303 dst.prefs = prefs; 1304 1305 hiscore->rule = -1; 1306 hiscore->ifa = NULL; 1307 1308 rcu_read_lock(); 1309 1310 for_each_netdev_rcu(net, dev) { 1311 struct inet6_dev *idev; 1312 1313 /* Candidate Source Address (section 4) 1314 * - multicast and link-local destination address, 1315 * the set of candidate source address MUST only 1316 * include addresses assigned to interfaces 1317 * belonging to the same link as the outgoing 1318 * interface. 1319 * (- For site-local destination addresses, the 1320 * set of candidate source addresses MUST only 1321 * include addresses assigned to interfaces 1322 * belonging to the same site as the outgoing 1323 * interface.) 1324 */ 1325 if (((dst_type & IPV6_ADDR_MULTICAST) || 1326 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL) && 1327 dst.ifindex && dev->ifindex != dst.ifindex) 1328 continue; 1329 1330 idev = __in6_dev_get(dev); 1331 if (!idev) 1332 continue; 1333 1334 read_lock_bh(&idev->lock); 1335 list_for_each_entry(score->ifa, &idev->addr_list, if_list) { 1336 int i; 1337 1338 /* 1339 * - Tentative Address (RFC2462 section 5.4) 1340 * - A tentative address is not considered 1341 * "assigned to an interface" in the traditional 1342 * sense, unless it is also flagged as optimistic. 1343 * - Candidate Source Address (section 4) 1344 * - In any case, anycast addresses, multicast 1345 * addresses, and the unspecified address MUST 1346 * NOT be included in a candidate set. 1347 */ 1348 if ((score->ifa->flags & IFA_F_TENTATIVE) && 1349 (!(score->ifa->flags & IFA_F_OPTIMISTIC))) 1350 continue; 1351 1352 score->addr_type = __ipv6_addr_type(&score->ifa->addr); 1353 1354 if (unlikely(score->addr_type == IPV6_ADDR_ANY || 1355 score->addr_type & IPV6_ADDR_MULTICAST)) { 1356 LIMIT_NETDEBUG(KERN_DEBUG 1357 "ADDRCONF: unspecified / multicast address " 1358 "assigned as unicast address on %s", 1359 dev->name); 1360 continue; 1361 } 1362 1363 score->rule = -1; 1364 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX); 1365 1366 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) { 1367 int minihiscore, miniscore; 1368 1369 minihiscore = ipv6_get_saddr_eval(net, hiscore, &dst, i); 1370 miniscore = ipv6_get_saddr_eval(net, score, &dst, i); 1371 1372 if (minihiscore > miniscore) { 1373 if (i == IPV6_SADDR_RULE_SCOPE && 1374 score->scopedist > 0) { 1375 /* 1376 * special case: 1377 * each remaining entry 1378 * has too small (not enough) 1379 * scope, because ifa entries 1380 * are sorted by their scope 1381 * values. 1382 */ 1383 goto try_nextdev; 1384 } 1385 break; 1386 } else if (minihiscore < miniscore) { 1387 if (hiscore->ifa) 1388 in6_ifa_put(hiscore->ifa); 1389 1390 in6_ifa_hold(score->ifa); 1391 1392 swap(hiscore, score); 1393 1394 /* restore our iterator */ 1395 score->ifa = hiscore->ifa; 1396 1397 break; 1398 } 1399 } 1400 } 1401 try_nextdev: 1402 read_unlock_bh(&idev->lock); 1403 } 1404 rcu_read_unlock(); 1405 1406 if (!hiscore->ifa) 1407 return -EADDRNOTAVAIL; 1408 1409 *saddr = hiscore->ifa->addr; 1410 in6_ifa_put(hiscore->ifa); 1411 return 0; 1412 } 1413 EXPORT_SYMBOL(ipv6_dev_get_saddr); 1414 1415 int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr, 1416 unsigned char banned_flags) 1417 { 1418 struct inet6_ifaddr *ifp; 1419 int err = -EADDRNOTAVAIL; 1420 1421 list_for_each_entry(ifp, &idev->addr_list, if_list) { 1422 if (ifp->scope == IFA_LINK && 1423 !(ifp->flags & banned_flags)) { 1424 *addr = ifp->addr; 1425 err = 0; 1426 break; 1427 } 1428 } 1429 return err; 1430 } 1431 1432 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr, 1433 unsigned char banned_flags) 1434 { 1435 struct inet6_dev *idev; 1436 int err = -EADDRNOTAVAIL; 1437 1438 rcu_read_lock(); 1439 idev = __in6_dev_get(dev); 1440 if (idev) { 1441 read_lock_bh(&idev->lock); 1442 err = __ipv6_get_lladdr(idev, addr, banned_flags); 1443 read_unlock_bh(&idev->lock); 1444 } 1445 rcu_read_unlock(); 1446 return err; 1447 } 1448 1449 static int ipv6_count_addresses(struct inet6_dev *idev) 1450 { 1451 int cnt = 0; 1452 struct inet6_ifaddr *ifp; 1453 1454 read_lock_bh(&idev->lock); 1455 list_for_each_entry(ifp, &idev->addr_list, if_list) 1456 cnt++; 1457 read_unlock_bh(&idev->lock); 1458 return cnt; 1459 } 1460 1461 int ipv6_chk_addr(struct net *net, const struct in6_addr *addr, 1462 const struct net_device *dev, int strict) 1463 { 1464 struct inet6_ifaddr *ifp; 1465 unsigned int hash = inet6_addr_hash(addr); 1466 1467 rcu_read_lock_bh(); 1468 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) { 1469 if (!net_eq(dev_net(ifp->idev->dev), net)) 1470 continue; 1471 if (ipv6_addr_equal(&ifp->addr, addr) && 1472 !(ifp->flags&IFA_F_TENTATIVE) && 1473 (dev == NULL || ifp->idev->dev == dev || 1474 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) { 1475 rcu_read_unlock_bh(); 1476 return 1; 1477 } 1478 } 1479 1480 rcu_read_unlock_bh(); 1481 return 0; 1482 } 1483 EXPORT_SYMBOL(ipv6_chk_addr); 1484 1485 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr, 1486 struct net_device *dev) 1487 { 1488 unsigned int hash = inet6_addr_hash(addr); 1489 struct inet6_ifaddr *ifp; 1490 1491 hlist_for_each_entry(ifp, &inet6_addr_lst[hash], addr_lst) { 1492 if (!net_eq(dev_net(ifp->idev->dev), net)) 1493 continue; 1494 if (ipv6_addr_equal(&ifp->addr, addr)) { 1495 if (dev == NULL || ifp->idev->dev == dev) 1496 return true; 1497 } 1498 } 1499 return false; 1500 } 1501 1502 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev) 1503 { 1504 struct inet6_dev *idev; 1505 struct inet6_ifaddr *ifa; 1506 int onlink; 1507 1508 onlink = 0; 1509 rcu_read_lock(); 1510 idev = __in6_dev_get(dev); 1511 if (idev) { 1512 read_lock_bh(&idev->lock); 1513 list_for_each_entry(ifa, &idev->addr_list, if_list) { 1514 onlink = ipv6_prefix_equal(addr, &ifa->addr, 1515 ifa->prefix_len); 1516 if (onlink) 1517 break; 1518 } 1519 read_unlock_bh(&idev->lock); 1520 } 1521 rcu_read_unlock(); 1522 return onlink; 1523 } 1524 EXPORT_SYMBOL(ipv6_chk_prefix); 1525 1526 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr, 1527 struct net_device *dev, int strict) 1528 { 1529 struct inet6_ifaddr *ifp, *result = NULL; 1530 unsigned int hash = inet6_addr_hash(addr); 1531 1532 rcu_read_lock_bh(); 1533 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) { 1534 if (!net_eq(dev_net(ifp->idev->dev), net)) 1535 continue; 1536 if (ipv6_addr_equal(&ifp->addr, addr)) { 1537 if (dev == NULL || ifp->idev->dev == dev || 1538 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) { 1539 result = ifp; 1540 in6_ifa_hold(ifp); 1541 break; 1542 } 1543 } 1544 } 1545 rcu_read_unlock_bh(); 1546 1547 return result; 1548 } 1549 1550 /* Gets referenced address, destroys ifaddr */ 1551 1552 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed) 1553 { 1554 if (ifp->flags&IFA_F_PERMANENT) { 1555 spin_lock_bh(&ifp->lock); 1556 addrconf_del_dad_timer(ifp); 1557 ifp->flags |= IFA_F_TENTATIVE; 1558 if (dad_failed) 1559 ifp->flags |= IFA_F_DADFAILED; 1560 spin_unlock_bh(&ifp->lock); 1561 if (dad_failed) 1562 ipv6_ifa_notify(0, ifp); 1563 in6_ifa_put(ifp); 1564 #ifdef CONFIG_IPV6_PRIVACY 1565 } else if (ifp->flags&IFA_F_TEMPORARY) { 1566 struct inet6_ifaddr *ifpub; 1567 spin_lock_bh(&ifp->lock); 1568 ifpub = ifp->ifpub; 1569 if (ifpub) { 1570 in6_ifa_hold(ifpub); 1571 spin_unlock_bh(&ifp->lock); 1572 ipv6_create_tempaddr(ifpub, ifp); 1573 in6_ifa_put(ifpub); 1574 } else { 1575 spin_unlock_bh(&ifp->lock); 1576 } 1577 ipv6_del_addr(ifp); 1578 #endif 1579 } else 1580 ipv6_del_addr(ifp); 1581 } 1582 1583 static int addrconf_dad_end(struct inet6_ifaddr *ifp) 1584 { 1585 int err = -ENOENT; 1586 1587 spin_lock(&ifp->state_lock); 1588 if (ifp->state == INET6_IFADDR_STATE_DAD) { 1589 ifp->state = INET6_IFADDR_STATE_POSTDAD; 1590 err = 0; 1591 } 1592 spin_unlock(&ifp->state_lock); 1593 1594 return err; 1595 } 1596 1597 void addrconf_dad_failure(struct inet6_ifaddr *ifp) 1598 { 1599 struct inet6_dev *idev = ifp->idev; 1600 1601 if (addrconf_dad_end(ifp)) { 1602 in6_ifa_put(ifp); 1603 return; 1604 } 1605 1606 net_info_ratelimited("%s: IPv6 duplicate address %pI6c detected!\n", 1607 ifp->idev->dev->name, &ifp->addr); 1608 1609 if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6) { 1610 struct in6_addr addr; 1611 1612 addr.s6_addr32[0] = htonl(0xfe800000); 1613 addr.s6_addr32[1] = 0; 1614 1615 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) && 1616 ipv6_addr_equal(&ifp->addr, &addr)) { 1617 /* DAD failed for link-local based on MAC address */ 1618 idev->cnf.disable_ipv6 = 1; 1619 1620 pr_info("%s: IPv6 being disabled!\n", 1621 ifp->idev->dev->name); 1622 } 1623 } 1624 1625 addrconf_dad_stop(ifp, 1); 1626 } 1627 1628 /* Join to solicited addr multicast group. */ 1629 1630 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr) 1631 { 1632 struct in6_addr maddr; 1633 1634 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP)) 1635 return; 1636 1637 addrconf_addr_solict_mult(addr, &maddr); 1638 ipv6_dev_mc_inc(dev, &maddr); 1639 } 1640 1641 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr) 1642 { 1643 struct in6_addr maddr; 1644 1645 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP)) 1646 return; 1647 1648 addrconf_addr_solict_mult(addr, &maddr); 1649 __ipv6_dev_mc_dec(idev, &maddr); 1650 } 1651 1652 static void addrconf_join_anycast(struct inet6_ifaddr *ifp) 1653 { 1654 struct in6_addr addr; 1655 if (ifp->prefix_len == 127) /* RFC 6164 */ 1656 return; 1657 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len); 1658 if (ipv6_addr_any(&addr)) 1659 return; 1660 ipv6_dev_ac_inc(ifp->idev->dev, &addr); 1661 } 1662 1663 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp) 1664 { 1665 struct in6_addr addr; 1666 if (ifp->prefix_len == 127) /* RFC 6164 */ 1667 return; 1668 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len); 1669 if (ipv6_addr_any(&addr)) 1670 return; 1671 __ipv6_dev_ac_dec(ifp->idev, &addr); 1672 } 1673 1674 static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev) 1675 { 1676 if (dev->addr_len != ETH_ALEN) 1677 return -1; 1678 memcpy(eui, dev->dev_addr, 3); 1679 memcpy(eui + 5, dev->dev_addr + 3, 3); 1680 1681 /* 1682 * The zSeries OSA network cards can be shared among various 1683 * OS instances, but the OSA cards have only one MAC address. 1684 * This leads to duplicate address conflicts in conjunction 1685 * with IPv6 if more than one instance uses the same card. 1686 * 1687 * The driver for these cards can deliver a unique 16-bit 1688 * identifier for each instance sharing the same card. It is 1689 * placed instead of 0xFFFE in the interface identifier. The 1690 * "u" bit of the interface identifier is not inverted in this 1691 * case. Hence the resulting interface identifier has local 1692 * scope according to RFC2373. 1693 */ 1694 if (dev->dev_id) { 1695 eui[3] = (dev->dev_id >> 8) & 0xFF; 1696 eui[4] = dev->dev_id & 0xFF; 1697 } else { 1698 eui[3] = 0xFF; 1699 eui[4] = 0xFE; 1700 eui[0] ^= 2; 1701 } 1702 return 0; 1703 } 1704 1705 static int addrconf_ifid_eui64(u8 *eui, struct net_device *dev) 1706 { 1707 if (dev->addr_len != IEEE802154_ADDR_LEN) 1708 return -1; 1709 memcpy(eui, dev->dev_addr, 8); 1710 eui[0] ^= 2; 1711 return 0; 1712 } 1713 1714 static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev) 1715 { 1716 union fwnet_hwaddr *ha; 1717 1718 if (dev->addr_len != FWNET_ALEN) 1719 return -1; 1720 1721 ha = (union fwnet_hwaddr *)dev->dev_addr; 1722 1723 memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id)); 1724 eui[0] ^= 2; 1725 return 0; 1726 } 1727 1728 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev) 1729 { 1730 /* XXX: inherit EUI-64 from other interface -- yoshfuji */ 1731 if (dev->addr_len != ARCNET_ALEN) 1732 return -1; 1733 memset(eui, 0, 7); 1734 eui[7] = *(u8 *)dev->dev_addr; 1735 return 0; 1736 } 1737 1738 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev) 1739 { 1740 if (dev->addr_len != INFINIBAND_ALEN) 1741 return -1; 1742 memcpy(eui, dev->dev_addr + 12, 8); 1743 eui[0] |= 2; 1744 return 0; 1745 } 1746 1747 static int __ipv6_isatap_ifid(u8 *eui, __be32 addr) 1748 { 1749 if (addr == 0) 1750 return -1; 1751 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) || 1752 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) || 1753 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) || 1754 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) || 1755 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) || 1756 ipv4_is_lbcast(addr)) ? 0x00 : 0x02; 1757 eui[1] = 0; 1758 eui[2] = 0x5E; 1759 eui[3] = 0xFE; 1760 memcpy(eui + 4, &addr, 4); 1761 return 0; 1762 } 1763 1764 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev) 1765 { 1766 if (dev->priv_flags & IFF_ISATAP) 1767 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr); 1768 return -1; 1769 } 1770 1771 static int addrconf_ifid_gre(u8 *eui, struct net_device *dev) 1772 { 1773 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr); 1774 } 1775 1776 static int addrconf_ifid_ip6tnl(u8 *eui, struct net_device *dev) 1777 { 1778 memcpy(eui, dev->perm_addr, 3); 1779 memcpy(eui + 5, dev->perm_addr + 3, 3); 1780 eui[3] = 0xFF; 1781 eui[4] = 0xFE; 1782 eui[0] ^= 2; 1783 return 0; 1784 } 1785 1786 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev) 1787 { 1788 switch (dev->type) { 1789 case ARPHRD_ETHER: 1790 case ARPHRD_FDDI: 1791 return addrconf_ifid_eui48(eui, dev); 1792 case ARPHRD_ARCNET: 1793 return addrconf_ifid_arcnet(eui, dev); 1794 case ARPHRD_INFINIBAND: 1795 return addrconf_ifid_infiniband(eui, dev); 1796 case ARPHRD_SIT: 1797 return addrconf_ifid_sit(eui, dev); 1798 case ARPHRD_IPGRE: 1799 return addrconf_ifid_gre(eui, dev); 1800 case ARPHRD_IEEE802154: 1801 return addrconf_ifid_eui64(eui, dev); 1802 case ARPHRD_IEEE1394: 1803 return addrconf_ifid_ieee1394(eui, dev); 1804 case ARPHRD_TUNNEL6: 1805 return addrconf_ifid_ip6tnl(eui, dev); 1806 } 1807 return -1; 1808 } 1809 1810 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev) 1811 { 1812 int err = -1; 1813 struct inet6_ifaddr *ifp; 1814 1815 read_lock_bh(&idev->lock); 1816 list_for_each_entry(ifp, &idev->addr_list, if_list) { 1817 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) { 1818 memcpy(eui, ifp->addr.s6_addr+8, 8); 1819 err = 0; 1820 break; 1821 } 1822 } 1823 read_unlock_bh(&idev->lock); 1824 return err; 1825 } 1826 1827 #ifdef CONFIG_IPV6_PRIVACY 1828 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */ 1829 static void __ipv6_regen_rndid(struct inet6_dev *idev) 1830 { 1831 regen: 1832 get_random_bytes(idev->rndid, sizeof(idev->rndid)); 1833 idev->rndid[0] &= ~0x02; 1834 1835 /* 1836 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>: 1837 * check if generated address is not inappropriate 1838 * 1839 * - Reserved subnet anycast (RFC 2526) 1840 * 11111101 11....11 1xxxxxxx 1841 * - ISATAP (RFC4214) 6.1 1842 * 00-00-5E-FE-xx-xx-xx-xx 1843 * - value 0 1844 * - XXX: already assigned to an address on the device 1845 */ 1846 if (idev->rndid[0] == 0xfd && 1847 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff && 1848 (idev->rndid[7]&0x80)) 1849 goto regen; 1850 if ((idev->rndid[0]|idev->rndid[1]) == 0) { 1851 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe) 1852 goto regen; 1853 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00) 1854 goto regen; 1855 } 1856 } 1857 1858 static void ipv6_regen_rndid(unsigned long data) 1859 { 1860 struct inet6_dev *idev = (struct inet6_dev *) data; 1861 unsigned long expires; 1862 1863 rcu_read_lock_bh(); 1864 write_lock_bh(&idev->lock); 1865 1866 if (idev->dead) 1867 goto out; 1868 1869 __ipv6_regen_rndid(idev); 1870 1871 expires = jiffies + 1872 idev->cnf.temp_prefered_lft * HZ - 1873 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time - 1874 idev->cnf.max_desync_factor * HZ; 1875 if (time_before(expires, jiffies)) { 1876 pr_warn("%s: too short regeneration interval; timer disabled for %s\n", 1877 __func__, idev->dev->name); 1878 goto out; 1879 } 1880 1881 if (!mod_timer(&idev->regen_timer, expires)) 1882 in6_dev_hold(idev); 1883 1884 out: 1885 write_unlock_bh(&idev->lock); 1886 rcu_read_unlock_bh(); 1887 in6_dev_put(idev); 1888 } 1889 1890 static void __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) 1891 { 1892 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0) 1893 __ipv6_regen_rndid(idev); 1894 } 1895 #endif 1896 1897 /* 1898 * Add prefix route. 1899 */ 1900 1901 static void 1902 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev, 1903 unsigned long expires, u32 flags) 1904 { 1905 struct fib6_config cfg = { 1906 .fc_table = RT6_TABLE_PREFIX, 1907 .fc_metric = IP6_RT_PRIO_ADDRCONF, 1908 .fc_ifindex = dev->ifindex, 1909 .fc_expires = expires, 1910 .fc_dst_len = plen, 1911 .fc_flags = RTF_UP | flags, 1912 .fc_nlinfo.nl_net = dev_net(dev), 1913 .fc_protocol = RTPROT_KERNEL, 1914 }; 1915 1916 cfg.fc_dst = *pfx; 1917 1918 /* Prevent useless cloning on PtP SIT. 1919 This thing is done here expecting that the whole 1920 class of non-broadcast devices need not cloning. 1921 */ 1922 #if IS_ENABLED(CONFIG_IPV6_SIT) 1923 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT)) 1924 cfg.fc_flags |= RTF_NONEXTHOP; 1925 #endif 1926 1927 ip6_route_add(&cfg); 1928 } 1929 1930 1931 static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx, 1932 int plen, 1933 const struct net_device *dev, 1934 u32 flags, u32 noflags) 1935 { 1936 struct fib6_node *fn; 1937 struct rt6_info *rt = NULL; 1938 struct fib6_table *table; 1939 1940 table = fib6_get_table(dev_net(dev), RT6_TABLE_PREFIX); 1941 if (table == NULL) 1942 return NULL; 1943 1944 read_lock_bh(&table->tb6_lock); 1945 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0); 1946 if (!fn) 1947 goto out; 1948 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) { 1949 if (rt->dst.dev->ifindex != dev->ifindex) 1950 continue; 1951 if ((rt->rt6i_flags & flags) != flags) 1952 continue; 1953 if ((rt->rt6i_flags & noflags) != 0) 1954 continue; 1955 dst_hold(&rt->dst); 1956 break; 1957 } 1958 out: 1959 read_unlock_bh(&table->tb6_lock); 1960 return rt; 1961 } 1962 1963 1964 /* Create "default" multicast route to the interface */ 1965 1966 static void addrconf_add_mroute(struct net_device *dev) 1967 { 1968 struct fib6_config cfg = { 1969 .fc_table = RT6_TABLE_LOCAL, 1970 .fc_metric = IP6_RT_PRIO_ADDRCONF, 1971 .fc_ifindex = dev->ifindex, 1972 .fc_dst_len = 8, 1973 .fc_flags = RTF_UP, 1974 .fc_nlinfo.nl_net = dev_net(dev), 1975 }; 1976 1977 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0); 1978 1979 ip6_route_add(&cfg); 1980 } 1981 1982 #if IS_ENABLED(CONFIG_IPV6_SIT) 1983 static void sit_route_add(struct net_device *dev) 1984 { 1985 struct fib6_config cfg = { 1986 .fc_table = RT6_TABLE_MAIN, 1987 .fc_metric = IP6_RT_PRIO_ADDRCONF, 1988 .fc_ifindex = dev->ifindex, 1989 .fc_dst_len = 96, 1990 .fc_flags = RTF_UP | RTF_NONEXTHOP, 1991 .fc_nlinfo.nl_net = dev_net(dev), 1992 }; 1993 1994 /* prefix length - 96 bits "::d.d.d.d" */ 1995 ip6_route_add(&cfg); 1996 } 1997 #endif 1998 1999 static struct inet6_dev *addrconf_add_dev(struct net_device *dev) 2000 { 2001 struct inet6_dev *idev; 2002 2003 ASSERT_RTNL(); 2004 2005 idev = ipv6_find_idev(dev); 2006 if (!idev) 2007 return ERR_PTR(-ENOBUFS); 2008 2009 if (idev->cnf.disable_ipv6) 2010 return ERR_PTR(-EACCES); 2011 2012 /* Add default multicast route */ 2013 if (!(dev->flags & IFF_LOOPBACK)) 2014 addrconf_add_mroute(dev); 2015 2016 return idev; 2017 } 2018 2019 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao) 2020 { 2021 struct prefix_info *pinfo; 2022 __u32 valid_lft; 2023 __u32 prefered_lft; 2024 int addr_type; 2025 struct inet6_dev *in6_dev; 2026 struct net *net = dev_net(dev); 2027 2028 pinfo = (struct prefix_info *) opt; 2029 2030 if (len < sizeof(struct prefix_info)) { 2031 ADBG("addrconf: prefix option too short\n"); 2032 return; 2033 } 2034 2035 /* 2036 * Validation checks ([ADDRCONF], page 19) 2037 */ 2038 2039 addr_type = ipv6_addr_type(&pinfo->prefix); 2040 2041 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL)) 2042 return; 2043 2044 valid_lft = ntohl(pinfo->valid); 2045 prefered_lft = ntohl(pinfo->prefered); 2046 2047 if (prefered_lft > valid_lft) { 2048 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n"); 2049 return; 2050 } 2051 2052 in6_dev = in6_dev_get(dev); 2053 2054 if (in6_dev == NULL) { 2055 net_dbg_ratelimited("addrconf: device %s not configured\n", 2056 dev->name); 2057 return; 2058 } 2059 2060 /* 2061 * Two things going on here: 2062 * 1) Add routes for on-link prefixes 2063 * 2) Configure prefixes with the auto flag set 2064 */ 2065 2066 if (pinfo->onlink) { 2067 struct rt6_info *rt; 2068 unsigned long rt_expires; 2069 2070 /* Avoid arithmetic overflow. Really, we could 2071 * save rt_expires in seconds, likely valid_lft, 2072 * but it would require division in fib gc, that it 2073 * not good. 2074 */ 2075 if (HZ > USER_HZ) 2076 rt_expires = addrconf_timeout_fixup(valid_lft, HZ); 2077 else 2078 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ); 2079 2080 if (addrconf_finite_timeout(rt_expires)) 2081 rt_expires *= HZ; 2082 2083 rt = addrconf_get_prefix_route(&pinfo->prefix, 2084 pinfo->prefix_len, 2085 dev, 2086 RTF_ADDRCONF | RTF_PREFIX_RT, 2087 RTF_GATEWAY | RTF_DEFAULT); 2088 2089 if (rt) { 2090 /* Autoconf prefix route */ 2091 if (valid_lft == 0) { 2092 ip6_del_rt(rt); 2093 rt = NULL; 2094 } else if (addrconf_finite_timeout(rt_expires)) { 2095 /* not infinity */ 2096 rt6_set_expires(rt, jiffies + rt_expires); 2097 } else { 2098 rt6_clean_expires(rt); 2099 } 2100 } else if (valid_lft) { 2101 clock_t expires = 0; 2102 int flags = RTF_ADDRCONF | RTF_PREFIX_RT; 2103 if (addrconf_finite_timeout(rt_expires)) { 2104 /* not infinity */ 2105 flags |= RTF_EXPIRES; 2106 expires = jiffies_to_clock_t(rt_expires); 2107 } 2108 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len, 2109 dev, expires, flags); 2110 } 2111 ip6_rt_put(rt); 2112 } 2113 2114 /* Try to figure out our local address for this prefix */ 2115 2116 if (pinfo->autoconf && in6_dev->cnf.autoconf) { 2117 struct inet6_ifaddr *ifp; 2118 struct in6_addr addr; 2119 int create = 0, update_lft = 0; 2120 bool tokenized = false; 2121 2122 if (pinfo->prefix_len == 64) { 2123 memcpy(&addr, &pinfo->prefix, 8); 2124 2125 if (!ipv6_addr_any(&in6_dev->token)) { 2126 read_lock_bh(&in6_dev->lock); 2127 memcpy(addr.s6_addr + 8, 2128 in6_dev->token.s6_addr + 8, 8); 2129 read_unlock_bh(&in6_dev->lock); 2130 tokenized = true; 2131 } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) && 2132 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) { 2133 in6_dev_put(in6_dev); 2134 return; 2135 } 2136 goto ok; 2137 } 2138 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n", 2139 pinfo->prefix_len); 2140 in6_dev_put(in6_dev); 2141 return; 2142 2143 ok: 2144 2145 ifp = ipv6_get_ifaddr(net, &addr, dev, 1); 2146 2147 if (ifp == NULL && valid_lft) { 2148 int max_addresses = in6_dev->cnf.max_addresses; 2149 u32 addr_flags = 0; 2150 2151 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 2152 if (in6_dev->cnf.optimistic_dad && 2153 !net->ipv6.devconf_all->forwarding && sllao) 2154 addr_flags = IFA_F_OPTIMISTIC; 2155 #endif 2156 2157 /* Do not allow to create too much of autoconfigured 2158 * addresses; this would be too easy way to crash kernel. 2159 */ 2160 if (!max_addresses || 2161 ipv6_count_addresses(in6_dev) < max_addresses) 2162 ifp = ipv6_add_addr(in6_dev, &addr, NULL, 2163 pinfo->prefix_len, 2164 addr_type&IPV6_ADDR_SCOPE_MASK, 2165 addr_flags, valid_lft, 2166 prefered_lft); 2167 2168 if (IS_ERR_OR_NULL(ifp)) { 2169 in6_dev_put(in6_dev); 2170 return; 2171 } 2172 2173 update_lft = 0; 2174 create = 1; 2175 ifp->cstamp = jiffies; 2176 ifp->tokenized = tokenized; 2177 addrconf_dad_start(ifp); 2178 } 2179 2180 if (ifp) { 2181 int flags; 2182 unsigned long now; 2183 #ifdef CONFIG_IPV6_PRIVACY 2184 struct inet6_ifaddr *ift; 2185 #endif 2186 u32 stored_lft; 2187 2188 /* update lifetime (RFC2462 5.5.3 e) */ 2189 spin_lock(&ifp->lock); 2190 now = jiffies; 2191 if (ifp->valid_lft > (now - ifp->tstamp) / HZ) 2192 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ; 2193 else 2194 stored_lft = 0; 2195 if (!update_lft && !create && stored_lft) { 2196 if (valid_lft > MIN_VALID_LIFETIME || 2197 valid_lft > stored_lft) 2198 update_lft = 1; 2199 else if (stored_lft <= MIN_VALID_LIFETIME) { 2200 /* valid_lft <= stored_lft is always true */ 2201 /* 2202 * RFC 4862 Section 5.5.3e: 2203 * "Note that the preferred lifetime of 2204 * the corresponding address is always 2205 * reset to the Preferred Lifetime in 2206 * the received Prefix Information 2207 * option, regardless of whether the 2208 * valid lifetime is also reset or 2209 * ignored." 2210 * 2211 * So if the preferred lifetime in 2212 * this advertisement is different 2213 * than what we have stored, but the 2214 * valid lifetime is invalid, just 2215 * reset prefered_lft. 2216 * 2217 * We must set the valid lifetime 2218 * to the stored lifetime since we'll 2219 * be updating the timestamp below, 2220 * else we'll set it back to the 2221 * minimum. 2222 */ 2223 if (prefered_lft != ifp->prefered_lft) { 2224 valid_lft = stored_lft; 2225 update_lft = 1; 2226 } 2227 } else { 2228 valid_lft = MIN_VALID_LIFETIME; 2229 if (valid_lft < prefered_lft) 2230 prefered_lft = valid_lft; 2231 update_lft = 1; 2232 } 2233 } 2234 2235 if (update_lft) { 2236 ifp->valid_lft = valid_lft; 2237 ifp->prefered_lft = prefered_lft; 2238 ifp->tstamp = now; 2239 flags = ifp->flags; 2240 ifp->flags &= ~IFA_F_DEPRECATED; 2241 spin_unlock(&ifp->lock); 2242 2243 if (!(flags&IFA_F_TENTATIVE)) 2244 ipv6_ifa_notify(0, ifp); 2245 } else 2246 spin_unlock(&ifp->lock); 2247 2248 #ifdef CONFIG_IPV6_PRIVACY 2249 read_lock_bh(&in6_dev->lock); 2250 /* update all temporary addresses in the list */ 2251 list_for_each_entry(ift, &in6_dev->tempaddr_list, 2252 tmp_list) { 2253 int age, max_valid, max_prefered; 2254 2255 if (ifp != ift->ifpub) 2256 continue; 2257 2258 /* 2259 * RFC 4941 section 3.3: 2260 * If a received option will extend the lifetime 2261 * of a public address, the lifetimes of 2262 * temporary addresses should be extended, 2263 * subject to the overall constraint that no 2264 * temporary addresses should ever remain 2265 * "valid" or "preferred" for a time longer than 2266 * (TEMP_VALID_LIFETIME) or 2267 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), 2268 * respectively. 2269 */ 2270 age = (now - ift->cstamp) / HZ; 2271 max_valid = in6_dev->cnf.temp_valid_lft - age; 2272 if (max_valid < 0) 2273 max_valid = 0; 2274 2275 max_prefered = in6_dev->cnf.temp_prefered_lft - 2276 in6_dev->cnf.max_desync_factor - 2277 age; 2278 if (max_prefered < 0) 2279 max_prefered = 0; 2280 2281 if (valid_lft > max_valid) 2282 valid_lft = max_valid; 2283 2284 if (prefered_lft > max_prefered) 2285 prefered_lft = max_prefered; 2286 2287 spin_lock(&ift->lock); 2288 flags = ift->flags; 2289 ift->valid_lft = valid_lft; 2290 ift->prefered_lft = prefered_lft; 2291 ift->tstamp = now; 2292 if (prefered_lft > 0) 2293 ift->flags &= ~IFA_F_DEPRECATED; 2294 2295 spin_unlock(&ift->lock); 2296 if (!(flags&IFA_F_TENTATIVE)) 2297 ipv6_ifa_notify(0, ift); 2298 } 2299 2300 if ((create || list_empty(&in6_dev->tempaddr_list)) && in6_dev->cnf.use_tempaddr > 0) { 2301 /* 2302 * When a new public address is created as 2303 * described in [ADDRCONF], also create a new 2304 * temporary address. Also create a temporary 2305 * address if it's enabled but no temporary 2306 * address currently exists. 2307 */ 2308 read_unlock_bh(&in6_dev->lock); 2309 ipv6_create_tempaddr(ifp, NULL); 2310 } else { 2311 read_unlock_bh(&in6_dev->lock); 2312 } 2313 #endif 2314 in6_ifa_put(ifp); 2315 addrconf_verify(0); 2316 } 2317 } 2318 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo); 2319 in6_dev_put(in6_dev); 2320 } 2321 2322 /* 2323 * Set destination address. 2324 * Special case for SIT interfaces where we create a new "virtual" 2325 * device. 2326 */ 2327 int addrconf_set_dstaddr(struct net *net, void __user *arg) 2328 { 2329 struct in6_ifreq ireq; 2330 struct net_device *dev; 2331 int err = -EINVAL; 2332 2333 rtnl_lock(); 2334 2335 err = -EFAULT; 2336 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2337 goto err_exit; 2338 2339 dev = __dev_get_by_index(net, ireq.ifr6_ifindex); 2340 2341 err = -ENODEV; 2342 if (dev == NULL) 2343 goto err_exit; 2344 2345 #if IS_ENABLED(CONFIG_IPV6_SIT) 2346 if (dev->type == ARPHRD_SIT) { 2347 const struct net_device_ops *ops = dev->netdev_ops; 2348 struct ifreq ifr; 2349 struct ip_tunnel_parm p; 2350 2351 err = -EADDRNOTAVAIL; 2352 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4)) 2353 goto err_exit; 2354 2355 memset(&p, 0, sizeof(p)); 2356 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3]; 2357 p.iph.saddr = 0; 2358 p.iph.version = 4; 2359 p.iph.ihl = 5; 2360 p.iph.protocol = IPPROTO_IPV6; 2361 p.iph.ttl = 64; 2362 ifr.ifr_ifru.ifru_data = (__force void __user *)&p; 2363 2364 if (ops->ndo_do_ioctl) { 2365 mm_segment_t oldfs = get_fs(); 2366 2367 set_fs(KERNEL_DS); 2368 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL); 2369 set_fs(oldfs); 2370 } else 2371 err = -EOPNOTSUPP; 2372 2373 if (err == 0) { 2374 err = -ENOBUFS; 2375 dev = __dev_get_by_name(net, p.name); 2376 if (!dev) 2377 goto err_exit; 2378 err = dev_open(dev); 2379 } 2380 } 2381 #endif 2382 2383 err_exit: 2384 rtnl_unlock(); 2385 return err; 2386 } 2387 2388 /* 2389 * Manual configuration of address on an interface 2390 */ 2391 static int inet6_addr_add(struct net *net, int ifindex, const struct in6_addr *pfx, 2392 const struct in6_addr *peer_pfx, 2393 unsigned int plen, __u8 ifa_flags, __u32 prefered_lft, 2394 __u32 valid_lft) 2395 { 2396 struct inet6_ifaddr *ifp; 2397 struct inet6_dev *idev; 2398 struct net_device *dev; 2399 int scope; 2400 u32 flags; 2401 clock_t expires; 2402 unsigned long timeout; 2403 2404 ASSERT_RTNL(); 2405 2406 if (plen > 128) 2407 return -EINVAL; 2408 2409 /* check the lifetime */ 2410 if (!valid_lft || prefered_lft > valid_lft) 2411 return -EINVAL; 2412 2413 dev = __dev_get_by_index(net, ifindex); 2414 if (!dev) 2415 return -ENODEV; 2416 2417 idev = addrconf_add_dev(dev); 2418 if (IS_ERR(idev)) 2419 return PTR_ERR(idev); 2420 2421 scope = ipv6_addr_scope(pfx); 2422 2423 timeout = addrconf_timeout_fixup(valid_lft, HZ); 2424 if (addrconf_finite_timeout(timeout)) { 2425 expires = jiffies_to_clock_t(timeout * HZ); 2426 valid_lft = timeout; 2427 flags = RTF_EXPIRES; 2428 } else { 2429 expires = 0; 2430 flags = 0; 2431 ifa_flags |= IFA_F_PERMANENT; 2432 } 2433 2434 timeout = addrconf_timeout_fixup(prefered_lft, HZ); 2435 if (addrconf_finite_timeout(timeout)) { 2436 if (timeout == 0) 2437 ifa_flags |= IFA_F_DEPRECATED; 2438 prefered_lft = timeout; 2439 } 2440 2441 ifp = ipv6_add_addr(idev, pfx, peer_pfx, plen, scope, ifa_flags, 2442 valid_lft, prefered_lft); 2443 2444 if (!IS_ERR(ifp)) { 2445 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev, 2446 expires, flags); 2447 /* 2448 * Note that section 3.1 of RFC 4429 indicates 2449 * that the Optimistic flag should not be set for 2450 * manually configured addresses 2451 */ 2452 addrconf_dad_start(ifp); 2453 in6_ifa_put(ifp); 2454 addrconf_verify(0); 2455 return 0; 2456 } 2457 2458 return PTR_ERR(ifp); 2459 } 2460 2461 static int inet6_addr_del(struct net *net, int ifindex, const struct in6_addr *pfx, 2462 unsigned int plen) 2463 { 2464 struct inet6_ifaddr *ifp; 2465 struct inet6_dev *idev; 2466 struct net_device *dev; 2467 2468 if (plen > 128) 2469 return -EINVAL; 2470 2471 dev = __dev_get_by_index(net, ifindex); 2472 if (!dev) 2473 return -ENODEV; 2474 2475 if ((idev = __in6_dev_get(dev)) == NULL) 2476 return -ENXIO; 2477 2478 read_lock_bh(&idev->lock); 2479 list_for_each_entry(ifp, &idev->addr_list, if_list) { 2480 if (ifp->prefix_len == plen && 2481 ipv6_addr_equal(pfx, &ifp->addr)) { 2482 in6_ifa_hold(ifp); 2483 read_unlock_bh(&idev->lock); 2484 2485 ipv6_del_addr(ifp); 2486 return 0; 2487 } 2488 } 2489 read_unlock_bh(&idev->lock); 2490 return -EADDRNOTAVAIL; 2491 } 2492 2493 2494 int addrconf_add_ifaddr(struct net *net, void __user *arg) 2495 { 2496 struct in6_ifreq ireq; 2497 int err; 2498 2499 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 2500 return -EPERM; 2501 2502 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2503 return -EFAULT; 2504 2505 rtnl_lock(); 2506 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, NULL, 2507 ireq.ifr6_prefixlen, IFA_F_PERMANENT, 2508 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME); 2509 rtnl_unlock(); 2510 return err; 2511 } 2512 2513 int addrconf_del_ifaddr(struct net *net, void __user *arg) 2514 { 2515 struct in6_ifreq ireq; 2516 int err; 2517 2518 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 2519 return -EPERM; 2520 2521 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2522 return -EFAULT; 2523 2524 rtnl_lock(); 2525 err = inet6_addr_del(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, 2526 ireq.ifr6_prefixlen); 2527 rtnl_unlock(); 2528 return err; 2529 } 2530 2531 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr, 2532 int plen, int scope) 2533 { 2534 struct inet6_ifaddr *ifp; 2535 2536 ifp = ipv6_add_addr(idev, addr, NULL, plen, 2537 scope, IFA_F_PERMANENT, 0, 0); 2538 if (!IS_ERR(ifp)) { 2539 spin_lock_bh(&ifp->lock); 2540 ifp->flags &= ~IFA_F_TENTATIVE; 2541 spin_unlock_bh(&ifp->lock); 2542 ipv6_ifa_notify(RTM_NEWADDR, ifp); 2543 in6_ifa_put(ifp); 2544 } 2545 } 2546 2547 #if IS_ENABLED(CONFIG_IPV6_SIT) 2548 static void sit_add_v4_addrs(struct inet6_dev *idev) 2549 { 2550 struct in6_addr addr; 2551 struct net_device *dev; 2552 struct net *net = dev_net(idev->dev); 2553 int scope; 2554 2555 ASSERT_RTNL(); 2556 2557 memset(&addr, 0, sizeof(struct in6_addr)); 2558 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4); 2559 2560 if (idev->dev->flags&IFF_POINTOPOINT) { 2561 addr.s6_addr32[0] = htonl(0xfe800000); 2562 scope = IFA_LINK; 2563 } else { 2564 scope = IPV6_ADDR_COMPATv4; 2565 } 2566 2567 if (addr.s6_addr32[3]) { 2568 add_addr(idev, &addr, 128, scope); 2569 return; 2570 } 2571 2572 for_each_netdev(net, dev) { 2573 struct in_device *in_dev = __in_dev_get_rtnl(dev); 2574 if (in_dev && (dev->flags & IFF_UP)) { 2575 struct in_ifaddr *ifa; 2576 2577 int flag = scope; 2578 2579 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) { 2580 int plen; 2581 2582 addr.s6_addr32[3] = ifa->ifa_local; 2583 2584 if (ifa->ifa_scope == RT_SCOPE_LINK) 2585 continue; 2586 if (ifa->ifa_scope >= RT_SCOPE_HOST) { 2587 if (idev->dev->flags&IFF_POINTOPOINT) 2588 continue; 2589 flag |= IFA_HOST; 2590 } 2591 if (idev->dev->flags&IFF_POINTOPOINT) 2592 plen = 64; 2593 else 2594 plen = 96; 2595 2596 add_addr(idev, &addr, plen, flag); 2597 } 2598 } 2599 } 2600 } 2601 #endif 2602 2603 static void init_loopback(struct net_device *dev) 2604 { 2605 struct inet6_dev *idev; 2606 struct net_device *sp_dev; 2607 struct inet6_ifaddr *sp_ifa; 2608 struct rt6_info *sp_rt; 2609 2610 /* ::1 */ 2611 2612 ASSERT_RTNL(); 2613 2614 if ((idev = ipv6_find_idev(dev)) == NULL) { 2615 pr_debug("%s: add_dev failed\n", __func__); 2616 return; 2617 } 2618 2619 add_addr(idev, &in6addr_loopback, 128, IFA_HOST); 2620 2621 /* Add routes to other interface's IPv6 addresses */ 2622 for_each_netdev(dev_net(dev), sp_dev) { 2623 if (!strcmp(sp_dev->name, dev->name)) 2624 continue; 2625 2626 idev = __in6_dev_get(sp_dev); 2627 if (!idev) 2628 continue; 2629 2630 read_lock_bh(&idev->lock); 2631 list_for_each_entry(sp_ifa, &idev->addr_list, if_list) { 2632 2633 if (sp_ifa->flags & (IFA_F_DADFAILED | IFA_F_TENTATIVE)) 2634 continue; 2635 2636 if (sp_ifa->rt) 2637 continue; 2638 2639 sp_rt = addrconf_dst_alloc(idev, &sp_ifa->addr, 0); 2640 2641 /* Failure cases are ignored */ 2642 if (!IS_ERR(sp_rt)) { 2643 sp_ifa->rt = sp_rt; 2644 ip6_ins_rt(sp_rt); 2645 } 2646 } 2647 read_unlock_bh(&idev->lock); 2648 } 2649 } 2650 2651 static void addrconf_add_linklocal(struct inet6_dev *idev, const struct in6_addr *addr) 2652 { 2653 struct inet6_ifaddr *ifp; 2654 u32 addr_flags = IFA_F_PERMANENT; 2655 2656 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 2657 if (idev->cnf.optimistic_dad && 2658 !dev_net(idev->dev)->ipv6.devconf_all->forwarding) 2659 addr_flags |= IFA_F_OPTIMISTIC; 2660 #endif 2661 2662 2663 ifp = ipv6_add_addr(idev, addr, NULL, 64, IFA_LINK, addr_flags, 0, 0); 2664 if (!IS_ERR(ifp)) { 2665 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0); 2666 addrconf_dad_start(ifp); 2667 in6_ifa_put(ifp); 2668 } 2669 } 2670 2671 static void addrconf_dev_config(struct net_device *dev) 2672 { 2673 struct in6_addr addr; 2674 struct inet6_dev *idev; 2675 2676 ASSERT_RTNL(); 2677 2678 if ((dev->type != ARPHRD_ETHER) && 2679 (dev->type != ARPHRD_FDDI) && 2680 (dev->type != ARPHRD_ARCNET) && 2681 (dev->type != ARPHRD_INFINIBAND) && 2682 (dev->type != ARPHRD_IEEE802154) && 2683 (dev->type != ARPHRD_IEEE1394) && 2684 (dev->type != ARPHRD_TUNNEL6)) { 2685 /* Alas, we support only Ethernet autoconfiguration. */ 2686 return; 2687 } 2688 2689 idev = addrconf_add_dev(dev); 2690 if (IS_ERR(idev)) 2691 return; 2692 2693 memset(&addr, 0, sizeof(struct in6_addr)); 2694 addr.s6_addr32[0] = htonl(0xFE800000); 2695 2696 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0) 2697 addrconf_add_linklocal(idev, &addr); 2698 } 2699 2700 #if IS_ENABLED(CONFIG_IPV6_SIT) 2701 static void addrconf_sit_config(struct net_device *dev) 2702 { 2703 struct inet6_dev *idev; 2704 2705 ASSERT_RTNL(); 2706 2707 /* 2708 * Configure the tunnel with one of our IPv4 2709 * addresses... we should configure all of 2710 * our v4 addrs in the tunnel 2711 */ 2712 2713 if ((idev = ipv6_find_idev(dev)) == NULL) { 2714 pr_debug("%s: add_dev failed\n", __func__); 2715 return; 2716 } 2717 2718 if (dev->priv_flags & IFF_ISATAP) { 2719 struct in6_addr addr; 2720 2721 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0); 2722 addrconf_prefix_route(&addr, 64, dev, 0, 0); 2723 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev)) 2724 addrconf_add_linklocal(idev, &addr); 2725 return; 2726 } 2727 2728 sit_add_v4_addrs(idev); 2729 2730 if (dev->flags&IFF_POINTOPOINT) 2731 addrconf_add_mroute(dev); 2732 else 2733 sit_route_add(dev); 2734 } 2735 #endif 2736 2737 #if IS_ENABLED(CONFIG_NET_IPGRE) 2738 static void addrconf_gre_config(struct net_device *dev) 2739 { 2740 struct inet6_dev *idev; 2741 struct in6_addr addr; 2742 2743 ASSERT_RTNL(); 2744 2745 if ((idev = ipv6_find_idev(dev)) == NULL) { 2746 pr_debug("%s: add_dev failed\n", __func__); 2747 return; 2748 } 2749 2750 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0); 2751 addrconf_prefix_route(&addr, 64, dev, 0, 0); 2752 2753 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev)) 2754 addrconf_add_linklocal(idev, &addr); 2755 } 2756 #endif 2757 2758 static inline int 2759 ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev) 2760 { 2761 struct in6_addr lladdr; 2762 2763 if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) { 2764 addrconf_add_linklocal(idev, &lladdr); 2765 return 0; 2766 } 2767 return -1; 2768 } 2769 2770 static int addrconf_notify(struct notifier_block *this, unsigned long event, 2771 void *ptr) 2772 { 2773 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 2774 struct inet6_dev *idev = __in6_dev_get(dev); 2775 int run_pending = 0; 2776 int err; 2777 2778 switch (event) { 2779 case NETDEV_REGISTER: 2780 if (!idev && dev->mtu >= IPV6_MIN_MTU) { 2781 idev = ipv6_add_dev(dev); 2782 if (!idev) 2783 return notifier_from_errno(-ENOMEM); 2784 } 2785 break; 2786 2787 case NETDEV_UP: 2788 case NETDEV_CHANGE: 2789 if (dev->flags & IFF_SLAVE) 2790 break; 2791 2792 if (event == NETDEV_UP) { 2793 if (!addrconf_qdisc_ok(dev)) { 2794 /* device is not ready yet. */ 2795 pr_info("ADDRCONF(NETDEV_UP): %s: link is not ready\n", 2796 dev->name); 2797 break; 2798 } 2799 2800 if (!idev && dev->mtu >= IPV6_MIN_MTU) 2801 idev = ipv6_add_dev(dev); 2802 2803 if (idev) { 2804 idev->if_flags |= IF_READY; 2805 run_pending = 1; 2806 } 2807 } else { 2808 if (!addrconf_qdisc_ok(dev)) { 2809 /* device is still not ready. */ 2810 break; 2811 } 2812 2813 if (idev) { 2814 if (idev->if_flags & IF_READY) 2815 /* device is already configured. */ 2816 break; 2817 idev->if_flags |= IF_READY; 2818 } 2819 2820 pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n", 2821 dev->name); 2822 2823 run_pending = 1; 2824 } 2825 2826 switch (dev->type) { 2827 #if IS_ENABLED(CONFIG_IPV6_SIT) 2828 case ARPHRD_SIT: 2829 addrconf_sit_config(dev); 2830 break; 2831 #endif 2832 #if IS_ENABLED(CONFIG_NET_IPGRE) 2833 case ARPHRD_IPGRE: 2834 addrconf_gre_config(dev); 2835 break; 2836 #endif 2837 case ARPHRD_LOOPBACK: 2838 init_loopback(dev); 2839 break; 2840 2841 default: 2842 addrconf_dev_config(dev); 2843 break; 2844 } 2845 2846 if (idev) { 2847 if (run_pending) 2848 addrconf_dad_run(idev); 2849 2850 /* 2851 * If the MTU changed during the interface down, 2852 * when the interface up, the changed MTU must be 2853 * reflected in the idev as well as routers. 2854 */ 2855 if (idev->cnf.mtu6 != dev->mtu && 2856 dev->mtu >= IPV6_MIN_MTU) { 2857 rt6_mtu_change(dev, dev->mtu); 2858 idev->cnf.mtu6 = dev->mtu; 2859 } 2860 idev->tstamp = jiffies; 2861 inet6_ifinfo_notify(RTM_NEWLINK, idev); 2862 2863 /* 2864 * If the changed mtu during down is lower than 2865 * IPV6_MIN_MTU stop IPv6 on this interface. 2866 */ 2867 if (dev->mtu < IPV6_MIN_MTU) 2868 addrconf_ifdown(dev, 1); 2869 } 2870 break; 2871 2872 case NETDEV_CHANGEMTU: 2873 if (idev && dev->mtu >= IPV6_MIN_MTU) { 2874 rt6_mtu_change(dev, dev->mtu); 2875 idev->cnf.mtu6 = dev->mtu; 2876 break; 2877 } 2878 2879 if (!idev && dev->mtu >= IPV6_MIN_MTU) { 2880 idev = ipv6_add_dev(dev); 2881 if (idev) 2882 break; 2883 } 2884 2885 /* 2886 * MTU falled under IPV6_MIN_MTU. 2887 * Stop IPv6 on this interface. 2888 */ 2889 2890 case NETDEV_DOWN: 2891 case NETDEV_UNREGISTER: 2892 /* 2893 * Remove all addresses from this interface. 2894 */ 2895 addrconf_ifdown(dev, event != NETDEV_DOWN); 2896 break; 2897 2898 case NETDEV_CHANGENAME: 2899 if (idev) { 2900 snmp6_unregister_dev(idev); 2901 addrconf_sysctl_unregister(idev); 2902 addrconf_sysctl_register(idev); 2903 err = snmp6_register_dev(idev); 2904 if (err) 2905 return notifier_from_errno(err); 2906 } 2907 break; 2908 2909 case NETDEV_PRE_TYPE_CHANGE: 2910 case NETDEV_POST_TYPE_CHANGE: 2911 addrconf_type_change(dev, event); 2912 break; 2913 } 2914 2915 return NOTIFY_OK; 2916 } 2917 2918 /* 2919 * addrconf module should be notified of a device going up 2920 */ 2921 static struct notifier_block ipv6_dev_notf = { 2922 .notifier_call = addrconf_notify, 2923 }; 2924 2925 static void addrconf_type_change(struct net_device *dev, unsigned long event) 2926 { 2927 struct inet6_dev *idev; 2928 ASSERT_RTNL(); 2929 2930 idev = __in6_dev_get(dev); 2931 2932 if (event == NETDEV_POST_TYPE_CHANGE) 2933 ipv6_mc_remap(idev); 2934 else if (event == NETDEV_PRE_TYPE_CHANGE) 2935 ipv6_mc_unmap(idev); 2936 } 2937 2938 static int addrconf_ifdown(struct net_device *dev, int how) 2939 { 2940 struct net *net = dev_net(dev); 2941 struct inet6_dev *idev; 2942 struct inet6_ifaddr *ifa; 2943 int state, i; 2944 2945 ASSERT_RTNL(); 2946 2947 rt6_ifdown(net, dev); 2948 neigh_ifdown(&nd_tbl, dev); 2949 2950 idev = __in6_dev_get(dev); 2951 if (idev == NULL) 2952 return -ENODEV; 2953 2954 /* 2955 * Step 1: remove reference to ipv6 device from parent device. 2956 * Do not dev_put! 2957 */ 2958 if (how) { 2959 idev->dead = 1; 2960 2961 /* protected by rtnl_lock */ 2962 RCU_INIT_POINTER(dev->ip6_ptr, NULL); 2963 2964 /* Step 1.5: remove snmp6 entry */ 2965 snmp6_unregister_dev(idev); 2966 2967 } 2968 2969 /* Step 2: clear hash table */ 2970 for (i = 0; i < IN6_ADDR_HSIZE; i++) { 2971 struct hlist_head *h = &inet6_addr_lst[i]; 2972 2973 spin_lock_bh(&addrconf_hash_lock); 2974 restart: 2975 hlist_for_each_entry_rcu(ifa, h, addr_lst) { 2976 if (ifa->idev == idev) { 2977 hlist_del_init_rcu(&ifa->addr_lst); 2978 addrconf_del_dad_timer(ifa); 2979 goto restart; 2980 } 2981 } 2982 spin_unlock_bh(&addrconf_hash_lock); 2983 } 2984 2985 write_lock_bh(&idev->lock); 2986 2987 addrconf_del_rs_timer(idev); 2988 2989 /* Step 2: clear flags for stateless addrconf */ 2990 if (!how) 2991 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY); 2992 2993 #ifdef CONFIG_IPV6_PRIVACY 2994 if (how && del_timer(&idev->regen_timer)) 2995 in6_dev_put(idev); 2996 2997 /* Step 3: clear tempaddr list */ 2998 while (!list_empty(&idev->tempaddr_list)) { 2999 ifa = list_first_entry(&idev->tempaddr_list, 3000 struct inet6_ifaddr, tmp_list); 3001 list_del(&ifa->tmp_list); 3002 write_unlock_bh(&idev->lock); 3003 spin_lock_bh(&ifa->lock); 3004 3005 if (ifa->ifpub) { 3006 in6_ifa_put(ifa->ifpub); 3007 ifa->ifpub = NULL; 3008 } 3009 spin_unlock_bh(&ifa->lock); 3010 in6_ifa_put(ifa); 3011 write_lock_bh(&idev->lock); 3012 } 3013 #endif 3014 3015 while (!list_empty(&idev->addr_list)) { 3016 ifa = list_first_entry(&idev->addr_list, 3017 struct inet6_ifaddr, if_list); 3018 addrconf_del_dad_timer(ifa); 3019 3020 list_del(&ifa->if_list); 3021 3022 write_unlock_bh(&idev->lock); 3023 3024 spin_lock_bh(&ifa->state_lock); 3025 state = ifa->state; 3026 ifa->state = INET6_IFADDR_STATE_DEAD; 3027 spin_unlock_bh(&ifa->state_lock); 3028 3029 if (state != INET6_IFADDR_STATE_DEAD) { 3030 __ipv6_ifa_notify(RTM_DELADDR, ifa); 3031 inet6addr_notifier_call_chain(NETDEV_DOWN, ifa); 3032 } 3033 in6_ifa_put(ifa); 3034 3035 write_lock_bh(&idev->lock); 3036 } 3037 3038 write_unlock_bh(&idev->lock); 3039 3040 /* Step 5: Discard multicast list */ 3041 if (how) 3042 ipv6_mc_destroy_dev(idev); 3043 else 3044 ipv6_mc_down(idev); 3045 3046 idev->tstamp = jiffies; 3047 3048 /* Last: Shot the device (if unregistered) */ 3049 if (how) { 3050 addrconf_sysctl_unregister(idev); 3051 neigh_parms_release(&nd_tbl, idev->nd_parms); 3052 neigh_ifdown(&nd_tbl, dev); 3053 in6_dev_put(idev); 3054 } 3055 return 0; 3056 } 3057 3058 static void addrconf_rs_timer(unsigned long data) 3059 { 3060 struct inet6_dev *idev = (struct inet6_dev *)data; 3061 struct net_device *dev = idev->dev; 3062 struct in6_addr lladdr; 3063 3064 write_lock(&idev->lock); 3065 if (idev->dead || !(idev->if_flags & IF_READY)) 3066 goto out; 3067 3068 if (!ipv6_accept_ra(idev)) 3069 goto out; 3070 3071 /* Announcement received after solicitation was sent */ 3072 if (idev->if_flags & IF_RA_RCVD) 3073 goto out; 3074 3075 if (idev->rs_probes++ < idev->cnf.rtr_solicits) { 3076 write_unlock(&idev->lock); 3077 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE)) 3078 ndisc_send_rs(dev, &lladdr, 3079 &in6addr_linklocal_allrouters); 3080 else 3081 goto put; 3082 3083 write_lock(&idev->lock); 3084 /* The wait after the last probe can be shorter */ 3085 addrconf_mod_rs_timer(idev, (idev->rs_probes == 3086 idev->cnf.rtr_solicits) ? 3087 idev->cnf.rtr_solicit_delay : 3088 idev->cnf.rtr_solicit_interval); 3089 } else { 3090 /* 3091 * Note: we do not support deprecated "all on-link" 3092 * assumption any longer. 3093 */ 3094 pr_debug("%s: no IPv6 routers present\n", idev->dev->name); 3095 } 3096 3097 out: 3098 write_unlock(&idev->lock); 3099 put: 3100 in6_dev_put(idev); 3101 } 3102 3103 /* 3104 * Duplicate Address Detection 3105 */ 3106 static void addrconf_dad_kick(struct inet6_ifaddr *ifp) 3107 { 3108 unsigned long rand_num; 3109 struct inet6_dev *idev = ifp->idev; 3110 3111 if (ifp->flags & IFA_F_OPTIMISTIC) 3112 rand_num = 0; 3113 else 3114 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1); 3115 3116 ifp->dad_probes = idev->cnf.dad_transmits; 3117 addrconf_mod_dad_timer(ifp, rand_num); 3118 } 3119 3120 static void addrconf_dad_start(struct inet6_ifaddr *ifp) 3121 { 3122 struct inet6_dev *idev = ifp->idev; 3123 struct net_device *dev = idev->dev; 3124 3125 addrconf_join_solict(dev, &ifp->addr); 3126 3127 net_srandom(ifp->addr.s6_addr32[3]); 3128 3129 read_lock_bh(&idev->lock); 3130 spin_lock(&ifp->lock); 3131 if (ifp->state == INET6_IFADDR_STATE_DEAD) 3132 goto out; 3133 3134 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) || 3135 idev->cnf.accept_dad < 1 || 3136 !(ifp->flags&IFA_F_TENTATIVE) || 3137 ifp->flags & IFA_F_NODAD) { 3138 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED); 3139 spin_unlock(&ifp->lock); 3140 read_unlock_bh(&idev->lock); 3141 3142 addrconf_dad_completed(ifp); 3143 return; 3144 } 3145 3146 if (!(idev->if_flags & IF_READY)) { 3147 spin_unlock(&ifp->lock); 3148 read_unlock_bh(&idev->lock); 3149 /* 3150 * If the device is not ready: 3151 * - keep it tentative if it is a permanent address. 3152 * - otherwise, kill it. 3153 */ 3154 in6_ifa_hold(ifp); 3155 addrconf_dad_stop(ifp, 0); 3156 return; 3157 } 3158 3159 /* 3160 * Optimistic nodes can start receiving 3161 * Frames right away 3162 */ 3163 if (ifp->flags & IFA_F_OPTIMISTIC) 3164 ip6_ins_rt(ifp->rt); 3165 3166 addrconf_dad_kick(ifp); 3167 out: 3168 spin_unlock(&ifp->lock); 3169 read_unlock_bh(&idev->lock); 3170 } 3171 3172 static void addrconf_dad_timer(unsigned long data) 3173 { 3174 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data; 3175 struct inet6_dev *idev = ifp->idev; 3176 struct in6_addr mcaddr; 3177 3178 if (!ifp->dad_probes && addrconf_dad_end(ifp)) 3179 goto out; 3180 3181 write_lock(&idev->lock); 3182 if (idev->dead || !(idev->if_flags & IF_READY)) { 3183 write_unlock(&idev->lock); 3184 goto out; 3185 } 3186 3187 spin_lock(&ifp->lock); 3188 if (ifp->state == INET6_IFADDR_STATE_DEAD) { 3189 spin_unlock(&ifp->lock); 3190 write_unlock(&idev->lock); 3191 goto out; 3192 } 3193 3194 if (ifp->dad_probes == 0) { 3195 /* 3196 * DAD was successful 3197 */ 3198 3199 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED); 3200 spin_unlock(&ifp->lock); 3201 write_unlock(&idev->lock); 3202 3203 addrconf_dad_completed(ifp); 3204 3205 goto out; 3206 } 3207 3208 ifp->dad_probes--; 3209 addrconf_mod_dad_timer(ifp, ifp->idev->nd_parms->retrans_time); 3210 spin_unlock(&ifp->lock); 3211 write_unlock(&idev->lock); 3212 3213 /* send a neighbour solicitation for our addr */ 3214 addrconf_addr_solict_mult(&ifp->addr, &mcaddr); 3215 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &in6addr_any); 3216 out: 3217 in6_ifa_put(ifp); 3218 } 3219 3220 static void addrconf_dad_completed(struct inet6_ifaddr *ifp) 3221 { 3222 struct net_device *dev = ifp->idev->dev; 3223 struct in6_addr lladdr; 3224 bool send_rs, send_mld; 3225 3226 addrconf_del_dad_timer(ifp); 3227 3228 /* 3229 * Configure the address for reception. Now it is valid. 3230 */ 3231 3232 ipv6_ifa_notify(RTM_NEWADDR, ifp); 3233 3234 /* If added prefix is link local and we are prepared to process 3235 router advertisements, start sending router solicitations. 3236 */ 3237 3238 read_lock_bh(&ifp->idev->lock); 3239 spin_lock(&ifp->lock); 3240 send_mld = ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL && 3241 ifp->idev->valid_ll_addr_cnt == 1; 3242 send_rs = send_mld && 3243 ipv6_accept_ra(ifp->idev) && 3244 ifp->idev->cnf.rtr_solicits > 0 && 3245 (dev->flags&IFF_LOOPBACK) == 0; 3246 spin_unlock(&ifp->lock); 3247 read_unlock_bh(&ifp->idev->lock); 3248 3249 /* While dad is in progress mld report's source address is in6_addrany. 3250 * Resend with proper ll now. 3251 */ 3252 if (send_mld) 3253 ipv6_mc_dad_complete(ifp->idev); 3254 3255 if (send_rs) { 3256 /* 3257 * If a host as already performed a random delay 3258 * [...] as part of DAD [...] there is no need 3259 * to delay again before sending the first RS 3260 */ 3261 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE)) 3262 return; 3263 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters); 3264 3265 write_lock_bh(&ifp->idev->lock); 3266 spin_lock(&ifp->lock); 3267 ifp->idev->rs_probes = 1; 3268 ifp->idev->if_flags |= IF_RS_SENT; 3269 addrconf_mod_rs_timer(ifp->idev, 3270 ifp->idev->cnf.rtr_solicit_interval); 3271 spin_unlock(&ifp->lock); 3272 write_unlock_bh(&ifp->idev->lock); 3273 } 3274 } 3275 3276 static void addrconf_dad_run(struct inet6_dev *idev) 3277 { 3278 struct inet6_ifaddr *ifp; 3279 3280 read_lock_bh(&idev->lock); 3281 list_for_each_entry(ifp, &idev->addr_list, if_list) { 3282 spin_lock(&ifp->lock); 3283 if (ifp->flags & IFA_F_TENTATIVE && 3284 ifp->state == INET6_IFADDR_STATE_DAD) 3285 addrconf_dad_kick(ifp); 3286 spin_unlock(&ifp->lock); 3287 } 3288 read_unlock_bh(&idev->lock); 3289 } 3290 3291 #ifdef CONFIG_PROC_FS 3292 struct if6_iter_state { 3293 struct seq_net_private p; 3294 int bucket; 3295 int offset; 3296 }; 3297 3298 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos) 3299 { 3300 struct inet6_ifaddr *ifa = NULL; 3301 struct if6_iter_state *state = seq->private; 3302 struct net *net = seq_file_net(seq); 3303 int p = 0; 3304 3305 /* initial bucket if pos is 0 */ 3306 if (pos == 0) { 3307 state->bucket = 0; 3308 state->offset = 0; 3309 } 3310 3311 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) { 3312 hlist_for_each_entry_rcu_bh(ifa, &inet6_addr_lst[state->bucket], 3313 addr_lst) { 3314 if (!net_eq(dev_net(ifa->idev->dev), net)) 3315 continue; 3316 /* sync with offset */ 3317 if (p < state->offset) { 3318 p++; 3319 continue; 3320 } 3321 state->offset++; 3322 return ifa; 3323 } 3324 3325 /* prepare for next bucket */ 3326 state->offset = 0; 3327 p = 0; 3328 } 3329 return NULL; 3330 } 3331 3332 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, 3333 struct inet6_ifaddr *ifa) 3334 { 3335 struct if6_iter_state *state = seq->private; 3336 struct net *net = seq_file_net(seq); 3337 3338 hlist_for_each_entry_continue_rcu_bh(ifa, addr_lst) { 3339 if (!net_eq(dev_net(ifa->idev->dev), net)) 3340 continue; 3341 state->offset++; 3342 return ifa; 3343 } 3344 3345 while (++state->bucket < IN6_ADDR_HSIZE) { 3346 state->offset = 0; 3347 hlist_for_each_entry_rcu_bh(ifa, 3348 &inet6_addr_lst[state->bucket], addr_lst) { 3349 if (!net_eq(dev_net(ifa->idev->dev), net)) 3350 continue; 3351 state->offset++; 3352 return ifa; 3353 } 3354 } 3355 3356 return NULL; 3357 } 3358 3359 static void *if6_seq_start(struct seq_file *seq, loff_t *pos) 3360 __acquires(rcu_bh) 3361 { 3362 rcu_read_lock_bh(); 3363 return if6_get_first(seq, *pos); 3364 } 3365 3366 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos) 3367 { 3368 struct inet6_ifaddr *ifa; 3369 3370 ifa = if6_get_next(seq, v); 3371 ++*pos; 3372 return ifa; 3373 } 3374 3375 static void if6_seq_stop(struct seq_file *seq, void *v) 3376 __releases(rcu_bh) 3377 { 3378 rcu_read_unlock_bh(); 3379 } 3380 3381 static int if6_seq_show(struct seq_file *seq, void *v) 3382 { 3383 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v; 3384 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n", 3385 &ifp->addr, 3386 ifp->idev->dev->ifindex, 3387 ifp->prefix_len, 3388 ifp->scope, 3389 ifp->flags, 3390 ifp->idev->dev->name); 3391 return 0; 3392 } 3393 3394 static const struct seq_operations if6_seq_ops = { 3395 .start = if6_seq_start, 3396 .next = if6_seq_next, 3397 .show = if6_seq_show, 3398 .stop = if6_seq_stop, 3399 }; 3400 3401 static int if6_seq_open(struct inode *inode, struct file *file) 3402 { 3403 return seq_open_net(inode, file, &if6_seq_ops, 3404 sizeof(struct if6_iter_state)); 3405 } 3406 3407 static const struct file_operations if6_fops = { 3408 .owner = THIS_MODULE, 3409 .open = if6_seq_open, 3410 .read = seq_read, 3411 .llseek = seq_lseek, 3412 .release = seq_release_net, 3413 }; 3414 3415 static int __net_init if6_proc_net_init(struct net *net) 3416 { 3417 if (!proc_create("if_inet6", S_IRUGO, net->proc_net, &if6_fops)) 3418 return -ENOMEM; 3419 return 0; 3420 } 3421 3422 static void __net_exit if6_proc_net_exit(struct net *net) 3423 { 3424 remove_proc_entry("if_inet6", net->proc_net); 3425 } 3426 3427 static struct pernet_operations if6_proc_net_ops = { 3428 .init = if6_proc_net_init, 3429 .exit = if6_proc_net_exit, 3430 }; 3431 3432 int __init if6_proc_init(void) 3433 { 3434 return register_pernet_subsys(&if6_proc_net_ops); 3435 } 3436 3437 void if6_proc_exit(void) 3438 { 3439 unregister_pernet_subsys(&if6_proc_net_ops); 3440 } 3441 #endif /* CONFIG_PROC_FS */ 3442 3443 #if IS_ENABLED(CONFIG_IPV6_MIP6) 3444 /* Check if address is a home address configured on any interface. */ 3445 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr) 3446 { 3447 int ret = 0; 3448 struct inet6_ifaddr *ifp = NULL; 3449 unsigned int hash = inet6_addr_hash(addr); 3450 3451 rcu_read_lock_bh(); 3452 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) { 3453 if (!net_eq(dev_net(ifp->idev->dev), net)) 3454 continue; 3455 if (ipv6_addr_equal(&ifp->addr, addr) && 3456 (ifp->flags & IFA_F_HOMEADDRESS)) { 3457 ret = 1; 3458 break; 3459 } 3460 } 3461 rcu_read_unlock_bh(); 3462 return ret; 3463 } 3464 #endif 3465 3466 /* 3467 * Periodic address status verification 3468 */ 3469 3470 static void addrconf_verify(unsigned long foo) 3471 { 3472 unsigned long now, next, next_sec, next_sched; 3473 struct inet6_ifaddr *ifp; 3474 int i; 3475 3476 rcu_read_lock_bh(); 3477 spin_lock(&addrconf_verify_lock); 3478 now = jiffies; 3479 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY); 3480 3481 del_timer(&addr_chk_timer); 3482 3483 for (i = 0; i < IN6_ADDR_HSIZE; i++) { 3484 restart: 3485 hlist_for_each_entry_rcu_bh(ifp, 3486 &inet6_addr_lst[i], addr_lst) { 3487 unsigned long age; 3488 3489 if (ifp->flags & IFA_F_PERMANENT) 3490 continue; 3491 3492 spin_lock(&ifp->lock); 3493 /* We try to batch several events at once. */ 3494 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ; 3495 3496 if (ifp->valid_lft != INFINITY_LIFE_TIME && 3497 age >= ifp->valid_lft) { 3498 spin_unlock(&ifp->lock); 3499 in6_ifa_hold(ifp); 3500 ipv6_del_addr(ifp); 3501 goto restart; 3502 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) { 3503 spin_unlock(&ifp->lock); 3504 continue; 3505 } else if (age >= ifp->prefered_lft) { 3506 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */ 3507 int deprecate = 0; 3508 3509 if (!(ifp->flags&IFA_F_DEPRECATED)) { 3510 deprecate = 1; 3511 ifp->flags |= IFA_F_DEPRECATED; 3512 } 3513 3514 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next)) 3515 next = ifp->tstamp + ifp->valid_lft * HZ; 3516 3517 spin_unlock(&ifp->lock); 3518 3519 if (deprecate) { 3520 in6_ifa_hold(ifp); 3521 3522 ipv6_ifa_notify(0, ifp); 3523 in6_ifa_put(ifp); 3524 goto restart; 3525 } 3526 #ifdef CONFIG_IPV6_PRIVACY 3527 } else if ((ifp->flags&IFA_F_TEMPORARY) && 3528 !(ifp->flags&IFA_F_TENTATIVE)) { 3529 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry * 3530 ifp->idev->cnf.dad_transmits * 3531 ifp->idev->nd_parms->retrans_time / HZ; 3532 3533 if (age >= ifp->prefered_lft - regen_advance) { 3534 struct inet6_ifaddr *ifpub = ifp->ifpub; 3535 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 3536 next = ifp->tstamp + ifp->prefered_lft * HZ; 3537 if (!ifp->regen_count && ifpub) { 3538 ifp->regen_count++; 3539 in6_ifa_hold(ifp); 3540 in6_ifa_hold(ifpub); 3541 spin_unlock(&ifp->lock); 3542 3543 spin_lock(&ifpub->lock); 3544 ifpub->regen_count = 0; 3545 spin_unlock(&ifpub->lock); 3546 ipv6_create_tempaddr(ifpub, ifp); 3547 in6_ifa_put(ifpub); 3548 in6_ifa_put(ifp); 3549 goto restart; 3550 } 3551 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next)) 3552 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ; 3553 spin_unlock(&ifp->lock); 3554 #endif 3555 } else { 3556 /* ifp->prefered_lft <= ifp->valid_lft */ 3557 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 3558 next = ifp->tstamp + ifp->prefered_lft * HZ; 3559 spin_unlock(&ifp->lock); 3560 } 3561 } 3562 } 3563 3564 next_sec = round_jiffies_up(next); 3565 next_sched = next; 3566 3567 /* If rounded timeout is accurate enough, accept it. */ 3568 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ)) 3569 next_sched = next_sec; 3570 3571 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */ 3572 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX)) 3573 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX; 3574 3575 ADBG(KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n", 3576 now, next, next_sec, next_sched); 3577 3578 addr_chk_timer.expires = next_sched; 3579 add_timer(&addr_chk_timer); 3580 spin_unlock(&addrconf_verify_lock); 3581 rcu_read_unlock_bh(); 3582 } 3583 3584 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local, 3585 struct in6_addr **peer_pfx) 3586 { 3587 struct in6_addr *pfx = NULL; 3588 3589 *peer_pfx = NULL; 3590 3591 if (addr) 3592 pfx = nla_data(addr); 3593 3594 if (local) { 3595 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx))) 3596 *peer_pfx = pfx; 3597 pfx = nla_data(local); 3598 } 3599 3600 return pfx; 3601 } 3602 3603 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = { 3604 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) }, 3605 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) }, 3606 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) }, 3607 }; 3608 3609 static int 3610 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh) 3611 { 3612 struct net *net = sock_net(skb->sk); 3613 struct ifaddrmsg *ifm; 3614 struct nlattr *tb[IFA_MAX+1]; 3615 struct in6_addr *pfx, *peer_pfx; 3616 int err; 3617 3618 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy); 3619 if (err < 0) 3620 return err; 3621 3622 ifm = nlmsg_data(nlh); 3623 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx); 3624 if (pfx == NULL) 3625 return -EINVAL; 3626 3627 return inet6_addr_del(net, ifm->ifa_index, pfx, ifm->ifa_prefixlen); 3628 } 3629 3630 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags, 3631 u32 prefered_lft, u32 valid_lft) 3632 { 3633 u32 flags; 3634 clock_t expires; 3635 unsigned long timeout; 3636 3637 if (!valid_lft || (prefered_lft > valid_lft)) 3638 return -EINVAL; 3639 3640 timeout = addrconf_timeout_fixup(valid_lft, HZ); 3641 if (addrconf_finite_timeout(timeout)) { 3642 expires = jiffies_to_clock_t(timeout * HZ); 3643 valid_lft = timeout; 3644 flags = RTF_EXPIRES; 3645 } else { 3646 expires = 0; 3647 flags = 0; 3648 ifa_flags |= IFA_F_PERMANENT; 3649 } 3650 3651 timeout = addrconf_timeout_fixup(prefered_lft, HZ); 3652 if (addrconf_finite_timeout(timeout)) { 3653 if (timeout == 0) 3654 ifa_flags |= IFA_F_DEPRECATED; 3655 prefered_lft = timeout; 3656 } 3657 3658 spin_lock_bh(&ifp->lock); 3659 ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags; 3660 ifp->tstamp = jiffies; 3661 ifp->valid_lft = valid_lft; 3662 ifp->prefered_lft = prefered_lft; 3663 3664 spin_unlock_bh(&ifp->lock); 3665 if (!(ifp->flags&IFA_F_TENTATIVE)) 3666 ipv6_ifa_notify(0, ifp); 3667 3668 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev, 3669 expires, flags); 3670 addrconf_verify(0); 3671 3672 return 0; 3673 } 3674 3675 static int 3676 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh) 3677 { 3678 struct net *net = sock_net(skb->sk); 3679 struct ifaddrmsg *ifm; 3680 struct nlattr *tb[IFA_MAX+1]; 3681 struct in6_addr *pfx, *peer_pfx; 3682 struct inet6_ifaddr *ifa; 3683 struct net_device *dev; 3684 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME; 3685 u8 ifa_flags; 3686 int err; 3687 3688 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy); 3689 if (err < 0) 3690 return err; 3691 3692 ifm = nlmsg_data(nlh); 3693 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx); 3694 if (pfx == NULL) 3695 return -EINVAL; 3696 3697 if (tb[IFA_CACHEINFO]) { 3698 struct ifa_cacheinfo *ci; 3699 3700 ci = nla_data(tb[IFA_CACHEINFO]); 3701 valid_lft = ci->ifa_valid; 3702 preferred_lft = ci->ifa_prefered; 3703 } else { 3704 preferred_lft = INFINITY_LIFE_TIME; 3705 valid_lft = INFINITY_LIFE_TIME; 3706 } 3707 3708 dev = __dev_get_by_index(net, ifm->ifa_index); 3709 if (dev == NULL) 3710 return -ENODEV; 3711 3712 /* We ignore other flags so far. */ 3713 ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS); 3714 3715 ifa = ipv6_get_ifaddr(net, pfx, dev, 1); 3716 if (ifa == NULL) { 3717 /* 3718 * It would be best to check for !NLM_F_CREATE here but 3719 * userspace alreay relies on not having to provide this. 3720 */ 3721 return inet6_addr_add(net, ifm->ifa_index, pfx, peer_pfx, 3722 ifm->ifa_prefixlen, ifa_flags, 3723 preferred_lft, valid_lft); 3724 } 3725 3726 if (nlh->nlmsg_flags & NLM_F_EXCL || 3727 !(nlh->nlmsg_flags & NLM_F_REPLACE)) 3728 err = -EEXIST; 3729 else 3730 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft); 3731 3732 in6_ifa_put(ifa); 3733 3734 return err; 3735 } 3736 3737 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags, 3738 u8 scope, int ifindex) 3739 { 3740 struct ifaddrmsg *ifm; 3741 3742 ifm = nlmsg_data(nlh); 3743 ifm->ifa_family = AF_INET6; 3744 ifm->ifa_prefixlen = prefixlen; 3745 ifm->ifa_flags = flags; 3746 ifm->ifa_scope = scope; 3747 ifm->ifa_index = ifindex; 3748 } 3749 3750 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp, 3751 unsigned long tstamp, u32 preferred, u32 valid) 3752 { 3753 struct ifa_cacheinfo ci; 3754 3755 ci.cstamp = cstamp_delta(cstamp); 3756 ci.tstamp = cstamp_delta(tstamp); 3757 ci.ifa_prefered = preferred; 3758 ci.ifa_valid = valid; 3759 3760 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci); 3761 } 3762 3763 static inline int rt_scope(int ifa_scope) 3764 { 3765 if (ifa_scope & IFA_HOST) 3766 return RT_SCOPE_HOST; 3767 else if (ifa_scope & IFA_LINK) 3768 return RT_SCOPE_LINK; 3769 else if (ifa_scope & IFA_SITE) 3770 return RT_SCOPE_SITE; 3771 else 3772 return RT_SCOPE_UNIVERSE; 3773 } 3774 3775 static inline int inet6_ifaddr_msgsize(void) 3776 { 3777 return NLMSG_ALIGN(sizeof(struct ifaddrmsg)) 3778 + nla_total_size(16) /* IFA_LOCAL */ 3779 + nla_total_size(16) /* IFA_ADDRESS */ 3780 + nla_total_size(sizeof(struct ifa_cacheinfo)); 3781 } 3782 3783 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa, 3784 u32 portid, u32 seq, int event, unsigned int flags) 3785 { 3786 struct nlmsghdr *nlh; 3787 u32 preferred, valid; 3788 3789 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags); 3790 if (nlh == NULL) 3791 return -EMSGSIZE; 3792 3793 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope), 3794 ifa->idev->dev->ifindex); 3795 3796 if (!(ifa->flags&IFA_F_PERMANENT)) { 3797 preferred = ifa->prefered_lft; 3798 valid = ifa->valid_lft; 3799 if (preferred != INFINITY_LIFE_TIME) { 3800 long tval = (jiffies - ifa->tstamp)/HZ; 3801 if (preferred > tval) 3802 preferred -= tval; 3803 else 3804 preferred = 0; 3805 if (valid != INFINITY_LIFE_TIME) { 3806 if (valid > tval) 3807 valid -= tval; 3808 else 3809 valid = 0; 3810 } 3811 } 3812 } else { 3813 preferred = INFINITY_LIFE_TIME; 3814 valid = INFINITY_LIFE_TIME; 3815 } 3816 3817 if (!ipv6_addr_any(&ifa->peer_addr)) { 3818 if (nla_put(skb, IFA_LOCAL, 16, &ifa->addr) < 0 || 3819 nla_put(skb, IFA_ADDRESS, 16, &ifa->peer_addr) < 0) 3820 goto error; 3821 } else 3822 if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0) 3823 goto error; 3824 3825 if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) 3826 goto error; 3827 3828 return nlmsg_end(skb, nlh); 3829 3830 error: 3831 nlmsg_cancel(skb, nlh); 3832 return -EMSGSIZE; 3833 } 3834 3835 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca, 3836 u32 portid, u32 seq, int event, u16 flags) 3837 { 3838 struct nlmsghdr *nlh; 3839 u8 scope = RT_SCOPE_UNIVERSE; 3840 int ifindex = ifmca->idev->dev->ifindex; 3841 3842 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE) 3843 scope = RT_SCOPE_SITE; 3844 3845 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags); 3846 if (nlh == NULL) 3847 return -EMSGSIZE; 3848 3849 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 3850 if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 || 3851 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp, 3852 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 3853 nlmsg_cancel(skb, nlh); 3854 return -EMSGSIZE; 3855 } 3856 3857 return nlmsg_end(skb, nlh); 3858 } 3859 3860 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca, 3861 u32 portid, u32 seq, int event, unsigned int flags) 3862 { 3863 struct nlmsghdr *nlh; 3864 u8 scope = RT_SCOPE_UNIVERSE; 3865 int ifindex = ifaca->aca_idev->dev->ifindex; 3866 3867 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE) 3868 scope = RT_SCOPE_SITE; 3869 3870 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags); 3871 if (nlh == NULL) 3872 return -EMSGSIZE; 3873 3874 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 3875 if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 || 3876 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp, 3877 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 3878 nlmsg_cancel(skb, nlh); 3879 return -EMSGSIZE; 3880 } 3881 3882 return nlmsg_end(skb, nlh); 3883 } 3884 3885 enum addr_type_t { 3886 UNICAST_ADDR, 3887 MULTICAST_ADDR, 3888 ANYCAST_ADDR, 3889 }; 3890 3891 /* called with rcu_read_lock() */ 3892 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb, 3893 struct netlink_callback *cb, enum addr_type_t type, 3894 int s_ip_idx, int *p_ip_idx) 3895 { 3896 struct ifmcaddr6 *ifmca; 3897 struct ifacaddr6 *ifaca; 3898 int err = 1; 3899 int ip_idx = *p_ip_idx; 3900 3901 read_lock_bh(&idev->lock); 3902 switch (type) { 3903 case UNICAST_ADDR: { 3904 struct inet6_ifaddr *ifa; 3905 3906 /* unicast address incl. temp addr */ 3907 list_for_each_entry(ifa, &idev->addr_list, if_list) { 3908 if (++ip_idx < s_ip_idx) 3909 continue; 3910 err = inet6_fill_ifaddr(skb, ifa, 3911 NETLINK_CB(cb->skb).portid, 3912 cb->nlh->nlmsg_seq, 3913 RTM_NEWADDR, 3914 NLM_F_MULTI); 3915 if (err <= 0) 3916 break; 3917 nl_dump_check_consistent(cb, nlmsg_hdr(skb)); 3918 } 3919 break; 3920 } 3921 case MULTICAST_ADDR: 3922 /* multicast address */ 3923 for (ifmca = idev->mc_list; ifmca; 3924 ifmca = ifmca->next, ip_idx++) { 3925 if (ip_idx < s_ip_idx) 3926 continue; 3927 err = inet6_fill_ifmcaddr(skb, ifmca, 3928 NETLINK_CB(cb->skb).portid, 3929 cb->nlh->nlmsg_seq, 3930 RTM_GETMULTICAST, 3931 NLM_F_MULTI); 3932 if (err <= 0) 3933 break; 3934 } 3935 break; 3936 case ANYCAST_ADDR: 3937 /* anycast address */ 3938 for (ifaca = idev->ac_list; ifaca; 3939 ifaca = ifaca->aca_next, ip_idx++) { 3940 if (ip_idx < s_ip_idx) 3941 continue; 3942 err = inet6_fill_ifacaddr(skb, ifaca, 3943 NETLINK_CB(cb->skb).portid, 3944 cb->nlh->nlmsg_seq, 3945 RTM_GETANYCAST, 3946 NLM_F_MULTI); 3947 if (err <= 0) 3948 break; 3949 } 3950 break; 3951 default: 3952 break; 3953 } 3954 read_unlock_bh(&idev->lock); 3955 *p_ip_idx = ip_idx; 3956 return err; 3957 } 3958 3959 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb, 3960 enum addr_type_t type) 3961 { 3962 struct net *net = sock_net(skb->sk); 3963 int h, s_h; 3964 int idx, ip_idx; 3965 int s_idx, s_ip_idx; 3966 struct net_device *dev; 3967 struct inet6_dev *idev; 3968 struct hlist_head *head; 3969 3970 s_h = cb->args[0]; 3971 s_idx = idx = cb->args[1]; 3972 s_ip_idx = ip_idx = cb->args[2]; 3973 3974 rcu_read_lock(); 3975 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ net->dev_base_seq; 3976 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 3977 idx = 0; 3978 head = &net->dev_index_head[h]; 3979 hlist_for_each_entry_rcu(dev, head, index_hlist) { 3980 if (idx < s_idx) 3981 goto cont; 3982 if (h > s_h || idx > s_idx) 3983 s_ip_idx = 0; 3984 ip_idx = 0; 3985 idev = __in6_dev_get(dev); 3986 if (!idev) 3987 goto cont; 3988 3989 if (in6_dump_addrs(idev, skb, cb, type, 3990 s_ip_idx, &ip_idx) <= 0) 3991 goto done; 3992 cont: 3993 idx++; 3994 } 3995 } 3996 done: 3997 rcu_read_unlock(); 3998 cb->args[0] = h; 3999 cb->args[1] = idx; 4000 cb->args[2] = ip_idx; 4001 4002 return skb->len; 4003 } 4004 4005 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb) 4006 { 4007 enum addr_type_t type = UNICAST_ADDR; 4008 4009 return inet6_dump_addr(skb, cb, type); 4010 } 4011 4012 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb) 4013 { 4014 enum addr_type_t type = MULTICAST_ADDR; 4015 4016 return inet6_dump_addr(skb, cb, type); 4017 } 4018 4019 4020 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb) 4021 { 4022 enum addr_type_t type = ANYCAST_ADDR; 4023 4024 return inet6_dump_addr(skb, cb, type); 4025 } 4026 4027 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh) 4028 { 4029 struct net *net = sock_net(in_skb->sk); 4030 struct ifaddrmsg *ifm; 4031 struct nlattr *tb[IFA_MAX+1]; 4032 struct in6_addr *addr = NULL, *peer; 4033 struct net_device *dev = NULL; 4034 struct inet6_ifaddr *ifa; 4035 struct sk_buff *skb; 4036 int err; 4037 4038 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy); 4039 if (err < 0) 4040 goto errout; 4041 4042 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer); 4043 if (addr == NULL) { 4044 err = -EINVAL; 4045 goto errout; 4046 } 4047 4048 ifm = nlmsg_data(nlh); 4049 if (ifm->ifa_index) 4050 dev = __dev_get_by_index(net, ifm->ifa_index); 4051 4052 ifa = ipv6_get_ifaddr(net, addr, dev, 1); 4053 if (!ifa) { 4054 err = -EADDRNOTAVAIL; 4055 goto errout; 4056 } 4057 4058 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL); 4059 if (!skb) { 4060 err = -ENOBUFS; 4061 goto errout_ifa; 4062 } 4063 4064 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).portid, 4065 nlh->nlmsg_seq, RTM_NEWADDR, 0); 4066 if (err < 0) { 4067 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 4068 WARN_ON(err == -EMSGSIZE); 4069 kfree_skb(skb); 4070 goto errout_ifa; 4071 } 4072 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid); 4073 errout_ifa: 4074 in6_ifa_put(ifa); 4075 errout: 4076 return err; 4077 } 4078 4079 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa) 4080 { 4081 struct sk_buff *skb; 4082 struct net *net = dev_net(ifa->idev->dev); 4083 int err = -ENOBUFS; 4084 4085 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC); 4086 if (skb == NULL) 4087 goto errout; 4088 4089 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0); 4090 if (err < 0) { 4091 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 4092 WARN_ON(err == -EMSGSIZE); 4093 kfree_skb(skb); 4094 goto errout; 4095 } 4096 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC); 4097 return; 4098 errout: 4099 if (err < 0) 4100 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err); 4101 } 4102 4103 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf, 4104 __s32 *array, int bytes) 4105 { 4106 BUG_ON(bytes < (DEVCONF_MAX * 4)); 4107 4108 memset(array, 0, bytes); 4109 array[DEVCONF_FORWARDING] = cnf->forwarding; 4110 array[DEVCONF_HOPLIMIT] = cnf->hop_limit; 4111 array[DEVCONF_MTU6] = cnf->mtu6; 4112 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra; 4113 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects; 4114 array[DEVCONF_AUTOCONF] = cnf->autoconf; 4115 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits; 4116 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits; 4117 array[DEVCONF_RTR_SOLICIT_INTERVAL] = 4118 jiffies_to_msecs(cnf->rtr_solicit_interval); 4119 array[DEVCONF_RTR_SOLICIT_DELAY] = 4120 jiffies_to_msecs(cnf->rtr_solicit_delay); 4121 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version; 4122 array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] = 4123 jiffies_to_msecs(cnf->mldv1_unsolicited_report_interval); 4124 array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] = 4125 jiffies_to_msecs(cnf->mldv2_unsolicited_report_interval); 4126 #ifdef CONFIG_IPV6_PRIVACY 4127 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr; 4128 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft; 4129 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft; 4130 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry; 4131 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor; 4132 #endif 4133 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses; 4134 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr; 4135 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo; 4136 #ifdef CONFIG_IPV6_ROUTER_PREF 4137 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref; 4138 array[DEVCONF_RTR_PROBE_INTERVAL] = 4139 jiffies_to_msecs(cnf->rtr_probe_interval); 4140 #ifdef CONFIG_IPV6_ROUTE_INFO 4141 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen; 4142 #endif 4143 #endif 4144 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp; 4145 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route; 4146 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 4147 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad; 4148 #endif 4149 #ifdef CONFIG_IPV6_MROUTE 4150 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding; 4151 #endif 4152 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6; 4153 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad; 4154 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao; 4155 array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify; 4156 array[DEVCONF_SUPPRESS_FRAG_NDISC] = cnf->suppress_frag_ndisc; 4157 } 4158 4159 static inline size_t inet6_ifla6_size(void) 4160 { 4161 return nla_total_size(4) /* IFLA_INET6_FLAGS */ 4162 + nla_total_size(sizeof(struct ifla_cacheinfo)) 4163 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */ 4164 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */ 4165 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */ 4166 + nla_total_size(sizeof(struct in6_addr)); /* IFLA_INET6_TOKEN */ 4167 } 4168 4169 static inline size_t inet6_if_nlmsg_size(void) 4170 { 4171 return NLMSG_ALIGN(sizeof(struct ifinfomsg)) 4172 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */ 4173 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */ 4174 + nla_total_size(4) /* IFLA_MTU */ 4175 + nla_total_size(4) /* IFLA_LINK */ 4176 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */ 4177 } 4178 4179 static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib, 4180 int items, int bytes) 4181 { 4182 int i; 4183 int pad = bytes - sizeof(u64) * items; 4184 BUG_ON(pad < 0); 4185 4186 /* Use put_unaligned() because stats may not be aligned for u64. */ 4187 put_unaligned(items, &stats[0]); 4188 for (i = 1; i < items; i++) 4189 put_unaligned(atomic_long_read(&mib[i]), &stats[i]); 4190 4191 memset(&stats[items], 0, pad); 4192 } 4193 4194 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu **mib, 4195 int items, int bytes, size_t syncpoff) 4196 { 4197 int i; 4198 int pad = bytes - sizeof(u64) * items; 4199 BUG_ON(pad < 0); 4200 4201 /* Use put_unaligned() because stats may not be aligned for u64. */ 4202 put_unaligned(items, &stats[0]); 4203 for (i = 1; i < items; i++) 4204 put_unaligned(snmp_fold_field64(mib, i, syncpoff), &stats[i]); 4205 4206 memset(&stats[items], 0, pad); 4207 } 4208 4209 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype, 4210 int bytes) 4211 { 4212 switch (attrtype) { 4213 case IFLA_INET6_STATS: 4214 __snmp6_fill_stats64(stats, (void __percpu **)idev->stats.ipv6, 4215 IPSTATS_MIB_MAX, bytes, offsetof(struct ipstats_mib, syncp)); 4216 break; 4217 case IFLA_INET6_ICMP6STATS: 4218 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, ICMP6_MIB_MAX, bytes); 4219 break; 4220 } 4221 } 4222 4223 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev) 4224 { 4225 struct nlattr *nla; 4226 struct ifla_cacheinfo ci; 4227 4228 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags)) 4229 goto nla_put_failure; 4230 ci.max_reasm_len = IPV6_MAXPLEN; 4231 ci.tstamp = cstamp_delta(idev->tstamp); 4232 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time); 4233 ci.retrans_time = jiffies_to_msecs(idev->nd_parms->retrans_time); 4234 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci)) 4235 goto nla_put_failure; 4236 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32)); 4237 if (nla == NULL) 4238 goto nla_put_failure; 4239 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla)); 4240 4241 /* XXX - MC not implemented */ 4242 4243 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64)); 4244 if (nla == NULL) 4245 goto nla_put_failure; 4246 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla)); 4247 4248 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64)); 4249 if (nla == NULL) 4250 goto nla_put_failure; 4251 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla)); 4252 4253 nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr)); 4254 if (nla == NULL) 4255 goto nla_put_failure; 4256 read_lock_bh(&idev->lock); 4257 memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla)); 4258 read_unlock_bh(&idev->lock); 4259 4260 return 0; 4261 4262 nla_put_failure: 4263 return -EMSGSIZE; 4264 } 4265 4266 static size_t inet6_get_link_af_size(const struct net_device *dev) 4267 { 4268 if (!__in6_dev_get(dev)) 4269 return 0; 4270 4271 return inet6_ifla6_size(); 4272 } 4273 4274 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev) 4275 { 4276 struct inet6_dev *idev = __in6_dev_get(dev); 4277 4278 if (!idev) 4279 return -ENODATA; 4280 4281 if (inet6_fill_ifla6_attrs(skb, idev) < 0) 4282 return -EMSGSIZE; 4283 4284 return 0; 4285 } 4286 4287 static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token) 4288 { 4289 struct inet6_ifaddr *ifp; 4290 struct net_device *dev = idev->dev; 4291 bool update_rs = false; 4292 struct in6_addr ll_addr; 4293 4294 if (token == NULL) 4295 return -EINVAL; 4296 if (ipv6_addr_any(token)) 4297 return -EINVAL; 4298 if (dev->flags & (IFF_LOOPBACK | IFF_NOARP)) 4299 return -EINVAL; 4300 if (!ipv6_accept_ra(idev)) 4301 return -EINVAL; 4302 if (idev->cnf.rtr_solicits <= 0) 4303 return -EINVAL; 4304 4305 write_lock_bh(&idev->lock); 4306 4307 BUILD_BUG_ON(sizeof(token->s6_addr) != 16); 4308 memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8); 4309 4310 write_unlock_bh(&idev->lock); 4311 4312 if (!idev->dead && (idev->if_flags & IF_READY) && 4313 !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE | 4314 IFA_F_OPTIMISTIC)) { 4315 4316 /* If we're not ready, then normal ifup will take care 4317 * of this. Otherwise, we need to request our rs here. 4318 */ 4319 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters); 4320 update_rs = true; 4321 } 4322 4323 write_lock_bh(&idev->lock); 4324 4325 if (update_rs) { 4326 idev->if_flags |= IF_RS_SENT; 4327 idev->rs_probes = 1; 4328 addrconf_mod_rs_timer(idev, idev->cnf.rtr_solicit_interval); 4329 } 4330 4331 /* Well, that's kinda nasty ... */ 4332 list_for_each_entry(ifp, &idev->addr_list, if_list) { 4333 spin_lock(&ifp->lock); 4334 if (ifp->tokenized) { 4335 ifp->valid_lft = 0; 4336 ifp->prefered_lft = 0; 4337 } 4338 spin_unlock(&ifp->lock); 4339 } 4340 4341 write_unlock_bh(&idev->lock); 4342 addrconf_verify(0); 4343 return 0; 4344 } 4345 4346 static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla) 4347 { 4348 int err = -EINVAL; 4349 struct inet6_dev *idev = __in6_dev_get(dev); 4350 struct nlattr *tb[IFLA_INET6_MAX + 1]; 4351 4352 if (!idev) 4353 return -EAFNOSUPPORT; 4354 4355 if (nla_parse_nested(tb, IFLA_INET6_MAX, nla, NULL) < 0) 4356 BUG(); 4357 4358 if (tb[IFLA_INET6_TOKEN]) 4359 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN])); 4360 4361 return err; 4362 } 4363 4364 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev, 4365 u32 portid, u32 seq, int event, unsigned int flags) 4366 { 4367 struct net_device *dev = idev->dev; 4368 struct ifinfomsg *hdr; 4369 struct nlmsghdr *nlh; 4370 void *protoinfo; 4371 4372 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags); 4373 if (nlh == NULL) 4374 return -EMSGSIZE; 4375 4376 hdr = nlmsg_data(nlh); 4377 hdr->ifi_family = AF_INET6; 4378 hdr->__ifi_pad = 0; 4379 hdr->ifi_type = dev->type; 4380 hdr->ifi_index = dev->ifindex; 4381 hdr->ifi_flags = dev_get_flags(dev); 4382 hdr->ifi_change = 0; 4383 4384 if (nla_put_string(skb, IFLA_IFNAME, dev->name) || 4385 (dev->addr_len && 4386 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) || 4387 nla_put_u32(skb, IFLA_MTU, dev->mtu) || 4388 (dev->ifindex != dev->iflink && 4389 nla_put_u32(skb, IFLA_LINK, dev->iflink))) 4390 goto nla_put_failure; 4391 protoinfo = nla_nest_start(skb, IFLA_PROTINFO); 4392 if (protoinfo == NULL) 4393 goto nla_put_failure; 4394 4395 if (inet6_fill_ifla6_attrs(skb, idev) < 0) 4396 goto nla_put_failure; 4397 4398 nla_nest_end(skb, protoinfo); 4399 return nlmsg_end(skb, nlh); 4400 4401 nla_put_failure: 4402 nlmsg_cancel(skb, nlh); 4403 return -EMSGSIZE; 4404 } 4405 4406 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb) 4407 { 4408 struct net *net = sock_net(skb->sk); 4409 int h, s_h; 4410 int idx = 0, s_idx; 4411 struct net_device *dev; 4412 struct inet6_dev *idev; 4413 struct hlist_head *head; 4414 4415 s_h = cb->args[0]; 4416 s_idx = cb->args[1]; 4417 4418 rcu_read_lock(); 4419 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 4420 idx = 0; 4421 head = &net->dev_index_head[h]; 4422 hlist_for_each_entry_rcu(dev, head, index_hlist) { 4423 if (idx < s_idx) 4424 goto cont; 4425 idev = __in6_dev_get(dev); 4426 if (!idev) 4427 goto cont; 4428 if (inet6_fill_ifinfo(skb, idev, 4429 NETLINK_CB(cb->skb).portid, 4430 cb->nlh->nlmsg_seq, 4431 RTM_NEWLINK, NLM_F_MULTI) <= 0) 4432 goto out; 4433 cont: 4434 idx++; 4435 } 4436 } 4437 out: 4438 rcu_read_unlock(); 4439 cb->args[1] = idx; 4440 cb->args[0] = h; 4441 4442 return skb->len; 4443 } 4444 4445 void inet6_ifinfo_notify(int event, struct inet6_dev *idev) 4446 { 4447 struct sk_buff *skb; 4448 struct net *net = dev_net(idev->dev); 4449 int err = -ENOBUFS; 4450 4451 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC); 4452 if (skb == NULL) 4453 goto errout; 4454 4455 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0); 4456 if (err < 0) { 4457 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */ 4458 WARN_ON(err == -EMSGSIZE); 4459 kfree_skb(skb); 4460 goto errout; 4461 } 4462 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC); 4463 return; 4464 errout: 4465 if (err < 0) 4466 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err); 4467 } 4468 4469 static inline size_t inet6_prefix_nlmsg_size(void) 4470 { 4471 return NLMSG_ALIGN(sizeof(struct prefixmsg)) 4472 + nla_total_size(sizeof(struct in6_addr)) 4473 + nla_total_size(sizeof(struct prefix_cacheinfo)); 4474 } 4475 4476 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev, 4477 struct prefix_info *pinfo, u32 portid, u32 seq, 4478 int event, unsigned int flags) 4479 { 4480 struct prefixmsg *pmsg; 4481 struct nlmsghdr *nlh; 4482 struct prefix_cacheinfo ci; 4483 4484 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags); 4485 if (nlh == NULL) 4486 return -EMSGSIZE; 4487 4488 pmsg = nlmsg_data(nlh); 4489 pmsg->prefix_family = AF_INET6; 4490 pmsg->prefix_pad1 = 0; 4491 pmsg->prefix_pad2 = 0; 4492 pmsg->prefix_ifindex = idev->dev->ifindex; 4493 pmsg->prefix_len = pinfo->prefix_len; 4494 pmsg->prefix_type = pinfo->type; 4495 pmsg->prefix_pad3 = 0; 4496 pmsg->prefix_flags = 0; 4497 if (pinfo->onlink) 4498 pmsg->prefix_flags |= IF_PREFIX_ONLINK; 4499 if (pinfo->autoconf) 4500 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF; 4501 4502 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix)) 4503 goto nla_put_failure; 4504 ci.preferred_time = ntohl(pinfo->prefered); 4505 ci.valid_time = ntohl(pinfo->valid); 4506 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci)) 4507 goto nla_put_failure; 4508 return nlmsg_end(skb, nlh); 4509 4510 nla_put_failure: 4511 nlmsg_cancel(skb, nlh); 4512 return -EMSGSIZE; 4513 } 4514 4515 static void inet6_prefix_notify(int event, struct inet6_dev *idev, 4516 struct prefix_info *pinfo) 4517 { 4518 struct sk_buff *skb; 4519 struct net *net = dev_net(idev->dev); 4520 int err = -ENOBUFS; 4521 4522 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC); 4523 if (skb == NULL) 4524 goto errout; 4525 4526 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0); 4527 if (err < 0) { 4528 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */ 4529 WARN_ON(err == -EMSGSIZE); 4530 kfree_skb(skb); 4531 goto errout; 4532 } 4533 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC); 4534 return; 4535 errout: 4536 if (err < 0) 4537 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err); 4538 } 4539 4540 static void update_valid_ll_addr_cnt(struct inet6_ifaddr *ifp, int count) 4541 { 4542 write_lock_bh(&ifp->idev->lock); 4543 spin_lock(&ifp->lock); 4544 if (((ifp->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE|IFA_F_OPTIMISTIC| 4545 IFA_F_DADFAILED)) == IFA_F_PERMANENT) && 4546 (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) 4547 ifp->idev->valid_ll_addr_cnt += count; 4548 WARN_ON(ifp->idev->valid_ll_addr_cnt < 0); 4549 spin_unlock(&ifp->lock); 4550 write_unlock_bh(&ifp->idev->lock); 4551 } 4552 4553 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 4554 { 4555 struct net *net = dev_net(ifp->idev->dev); 4556 4557 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp); 4558 4559 switch (event) { 4560 case RTM_NEWADDR: 4561 update_valid_ll_addr_cnt(ifp, 1); 4562 4563 /* 4564 * If the address was optimistic 4565 * we inserted the route at the start of 4566 * our DAD process, so we don't need 4567 * to do it again 4568 */ 4569 if (!(ifp->rt->rt6i_node)) 4570 ip6_ins_rt(ifp->rt); 4571 if (ifp->idev->cnf.forwarding) 4572 addrconf_join_anycast(ifp); 4573 if (!ipv6_addr_any(&ifp->peer_addr)) 4574 addrconf_prefix_route(&ifp->peer_addr, 128, 4575 ifp->idev->dev, 0, 0); 4576 break; 4577 case RTM_DELADDR: 4578 update_valid_ll_addr_cnt(ifp, -1); 4579 4580 if (ifp->idev->cnf.forwarding) 4581 addrconf_leave_anycast(ifp); 4582 addrconf_leave_solict(ifp->idev, &ifp->addr); 4583 if (!ipv6_addr_any(&ifp->peer_addr)) { 4584 struct rt6_info *rt; 4585 struct net_device *dev = ifp->idev->dev; 4586 4587 rt = rt6_lookup(dev_net(dev), &ifp->peer_addr, NULL, 4588 dev->ifindex, 1); 4589 if (rt) { 4590 dst_hold(&rt->dst); 4591 if (ip6_del_rt(rt)) 4592 dst_free(&rt->dst); 4593 } 4594 } 4595 dst_hold(&ifp->rt->dst); 4596 4597 if (ip6_del_rt(ifp->rt)) 4598 dst_free(&ifp->rt->dst); 4599 break; 4600 } 4601 atomic_inc(&net->ipv6.dev_addr_genid); 4602 rt_genid_bump_ipv6(net); 4603 } 4604 4605 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 4606 { 4607 rcu_read_lock_bh(); 4608 if (likely(ifp->idev->dead == 0)) 4609 __ipv6_ifa_notify(event, ifp); 4610 rcu_read_unlock_bh(); 4611 } 4612 4613 #ifdef CONFIG_SYSCTL 4614 4615 static 4616 int addrconf_sysctl_forward(struct ctl_table *ctl, int write, 4617 void __user *buffer, size_t *lenp, loff_t *ppos) 4618 { 4619 int *valp = ctl->data; 4620 int val = *valp; 4621 loff_t pos = *ppos; 4622 struct ctl_table lctl; 4623 int ret; 4624 4625 /* 4626 * ctl->data points to idev->cnf.forwarding, we should 4627 * not modify it until we get the rtnl lock. 4628 */ 4629 lctl = *ctl; 4630 lctl.data = &val; 4631 4632 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 4633 4634 if (write) 4635 ret = addrconf_fixup_forwarding(ctl, valp, val); 4636 if (ret) 4637 *ppos = pos; 4638 return ret; 4639 } 4640 4641 static void dev_disable_change(struct inet6_dev *idev) 4642 { 4643 struct netdev_notifier_info info; 4644 4645 if (!idev || !idev->dev) 4646 return; 4647 4648 netdev_notifier_info_init(&info, idev->dev); 4649 if (idev->cnf.disable_ipv6) 4650 addrconf_notify(NULL, NETDEV_DOWN, &info); 4651 else 4652 addrconf_notify(NULL, NETDEV_UP, &info); 4653 } 4654 4655 static void addrconf_disable_change(struct net *net, __s32 newf) 4656 { 4657 struct net_device *dev; 4658 struct inet6_dev *idev; 4659 4660 rcu_read_lock(); 4661 for_each_netdev_rcu(net, dev) { 4662 idev = __in6_dev_get(dev); 4663 if (idev) { 4664 int changed = (!idev->cnf.disable_ipv6) ^ (!newf); 4665 idev->cnf.disable_ipv6 = newf; 4666 if (changed) 4667 dev_disable_change(idev); 4668 } 4669 } 4670 rcu_read_unlock(); 4671 } 4672 4673 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf) 4674 { 4675 struct net *net; 4676 int old; 4677 4678 if (!rtnl_trylock()) 4679 return restart_syscall(); 4680 4681 net = (struct net *)table->extra2; 4682 old = *p; 4683 *p = newf; 4684 4685 if (p == &net->ipv6.devconf_dflt->disable_ipv6) { 4686 rtnl_unlock(); 4687 return 0; 4688 } 4689 4690 if (p == &net->ipv6.devconf_all->disable_ipv6) { 4691 net->ipv6.devconf_dflt->disable_ipv6 = newf; 4692 addrconf_disable_change(net, newf); 4693 } else if ((!newf) ^ (!old)) 4694 dev_disable_change((struct inet6_dev *)table->extra1); 4695 4696 rtnl_unlock(); 4697 return 0; 4698 } 4699 4700 static 4701 int addrconf_sysctl_disable(struct ctl_table *ctl, int write, 4702 void __user *buffer, size_t *lenp, loff_t *ppos) 4703 { 4704 int *valp = ctl->data; 4705 int val = *valp; 4706 loff_t pos = *ppos; 4707 struct ctl_table lctl; 4708 int ret; 4709 4710 /* 4711 * ctl->data points to idev->cnf.disable_ipv6, we should 4712 * not modify it until we get the rtnl lock. 4713 */ 4714 lctl = *ctl; 4715 lctl.data = &val; 4716 4717 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 4718 4719 if (write) 4720 ret = addrconf_disable_ipv6(ctl, valp, val); 4721 if (ret) 4722 *ppos = pos; 4723 return ret; 4724 } 4725 4726 static struct addrconf_sysctl_table 4727 { 4728 struct ctl_table_header *sysctl_header; 4729 struct ctl_table addrconf_vars[DEVCONF_MAX+1]; 4730 } addrconf_sysctl __read_mostly = { 4731 .sysctl_header = NULL, 4732 .addrconf_vars = { 4733 { 4734 .procname = "forwarding", 4735 .data = &ipv6_devconf.forwarding, 4736 .maxlen = sizeof(int), 4737 .mode = 0644, 4738 .proc_handler = addrconf_sysctl_forward, 4739 }, 4740 { 4741 .procname = "hop_limit", 4742 .data = &ipv6_devconf.hop_limit, 4743 .maxlen = sizeof(int), 4744 .mode = 0644, 4745 .proc_handler = proc_dointvec, 4746 }, 4747 { 4748 .procname = "mtu", 4749 .data = &ipv6_devconf.mtu6, 4750 .maxlen = sizeof(int), 4751 .mode = 0644, 4752 .proc_handler = proc_dointvec, 4753 }, 4754 { 4755 .procname = "accept_ra", 4756 .data = &ipv6_devconf.accept_ra, 4757 .maxlen = sizeof(int), 4758 .mode = 0644, 4759 .proc_handler = proc_dointvec, 4760 }, 4761 { 4762 .procname = "accept_redirects", 4763 .data = &ipv6_devconf.accept_redirects, 4764 .maxlen = sizeof(int), 4765 .mode = 0644, 4766 .proc_handler = proc_dointvec, 4767 }, 4768 { 4769 .procname = "autoconf", 4770 .data = &ipv6_devconf.autoconf, 4771 .maxlen = sizeof(int), 4772 .mode = 0644, 4773 .proc_handler = proc_dointvec, 4774 }, 4775 { 4776 .procname = "dad_transmits", 4777 .data = &ipv6_devconf.dad_transmits, 4778 .maxlen = sizeof(int), 4779 .mode = 0644, 4780 .proc_handler = proc_dointvec, 4781 }, 4782 { 4783 .procname = "router_solicitations", 4784 .data = &ipv6_devconf.rtr_solicits, 4785 .maxlen = sizeof(int), 4786 .mode = 0644, 4787 .proc_handler = proc_dointvec, 4788 }, 4789 { 4790 .procname = "router_solicitation_interval", 4791 .data = &ipv6_devconf.rtr_solicit_interval, 4792 .maxlen = sizeof(int), 4793 .mode = 0644, 4794 .proc_handler = proc_dointvec_jiffies, 4795 }, 4796 { 4797 .procname = "router_solicitation_delay", 4798 .data = &ipv6_devconf.rtr_solicit_delay, 4799 .maxlen = sizeof(int), 4800 .mode = 0644, 4801 .proc_handler = proc_dointvec_jiffies, 4802 }, 4803 { 4804 .procname = "force_mld_version", 4805 .data = &ipv6_devconf.force_mld_version, 4806 .maxlen = sizeof(int), 4807 .mode = 0644, 4808 .proc_handler = proc_dointvec, 4809 }, 4810 { 4811 .procname = "mldv1_unsolicited_report_interval", 4812 .data = 4813 &ipv6_devconf.mldv1_unsolicited_report_interval, 4814 .maxlen = sizeof(int), 4815 .mode = 0644, 4816 .proc_handler = proc_dointvec_ms_jiffies, 4817 }, 4818 { 4819 .procname = "mldv2_unsolicited_report_interval", 4820 .data = 4821 &ipv6_devconf.mldv2_unsolicited_report_interval, 4822 .maxlen = sizeof(int), 4823 .mode = 0644, 4824 .proc_handler = proc_dointvec_ms_jiffies, 4825 }, 4826 #ifdef CONFIG_IPV6_PRIVACY 4827 { 4828 .procname = "use_tempaddr", 4829 .data = &ipv6_devconf.use_tempaddr, 4830 .maxlen = sizeof(int), 4831 .mode = 0644, 4832 .proc_handler = proc_dointvec, 4833 }, 4834 { 4835 .procname = "temp_valid_lft", 4836 .data = &ipv6_devconf.temp_valid_lft, 4837 .maxlen = sizeof(int), 4838 .mode = 0644, 4839 .proc_handler = proc_dointvec, 4840 }, 4841 { 4842 .procname = "temp_prefered_lft", 4843 .data = &ipv6_devconf.temp_prefered_lft, 4844 .maxlen = sizeof(int), 4845 .mode = 0644, 4846 .proc_handler = proc_dointvec, 4847 }, 4848 { 4849 .procname = "regen_max_retry", 4850 .data = &ipv6_devconf.regen_max_retry, 4851 .maxlen = sizeof(int), 4852 .mode = 0644, 4853 .proc_handler = proc_dointvec, 4854 }, 4855 { 4856 .procname = "max_desync_factor", 4857 .data = &ipv6_devconf.max_desync_factor, 4858 .maxlen = sizeof(int), 4859 .mode = 0644, 4860 .proc_handler = proc_dointvec, 4861 }, 4862 #endif 4863 { 4864 .procname = "max_addresses", 4865 .data = &ipv6_devconf.max_addresses, 4866 .maxlen = sizeof(int), 4867 .mode = 0644, 4868 .proc_handler = proc_dointvec, 4869 }, 4870 { 4871 .procname = "accept_ra_defrtr", 4872 .data = &ipv6_devconf.accept_ra_defrtr, 4873 .maxlen = sizeof(int), 4874 .mode = 0644, 4875 .proc_handler = proc_dointvec, 4876 }, 4877 { 4878 .procname = "accept_ra_pinfo", 4879 .data = &ipv6_devconf.accept_ra_pinfo, 4880 .maxlen = sizeof(int), 4881 .mode = 0644, 4882 .proc_handler = proc_dointvec, 4883 }, 4884 #ifdef CONFIG_IPV6_ROUTER_PREF 4885 { 4886 .procname = "accept_ra_rtr_pref", 4887 .data = &ipv6_devconf.accept_ra_rtr_pref, 4888 .maxlen = sizeof(int), 4889 .mode = 0644, 4890 .proc_handler = proc_dointvec, 4891 }, 4892 { 4893 .procname = "router_probe_interval", 4894 .data = &ipv6_devconf.rtr_probe_interval, 4895 .maxlen = sizeof(int), 4896 .mode = 0644, 4897 .proc_handler = proc_dointvec_jiffies, 4898 }, 4899 #ifdef CONFIG_IPV6_ROUTE_INFO 4900 { 4901 .procname = "accept_ra_rt_info_max_plen", 4902 .data = &ipv6_devconf.accept_ra_rt_info_max_plen, 4903 .maxlen = sizeof(int), 4904 .mode = 0644, 4905 .proc_handler = proc_dointvec, 4906 }, 4907 #endif 4908 #endif 4909 { 4910 .procname = "proxy_ndp", 4911 .data = &ipv6_devconf.proxy_ndp, 4912 .maxlen = sizeof(int), 4913 .mode = 0644, 4914 .proc_handler = proc_dointvec, 4915 }, 4916 { 4917 .procname = "accept_source_route", 4918 .data = &ipv6_devconf.accept_source_route, 4919 .maxlen = sizeof(int), 4920 .mode = 0644, 4921 .proc_handler = proc_dointvec, 4922 }, 4923 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 4924 { 4925 .procname = "optimistic_dad", 4926 .data = &ipv6_devconf.optimistic_dad, 4927 .maxlen = sizeof(int), 4928 .mode = 0644, 4929 .proc_handler = proc_dointvec, 4930 4931 }, 4932 #endif 4933 #ifdef CONFIG_IPV6_MROUTE 4934 { 4935 .procname = "mc_forwarding", 4936 .data = &ipv6_devconf.mc_forwarding, 4937 .maxlen = sizeof(int), 4938 .mode = 0444, 4939 .proc_handler = proc_dointvec, 4940 }, 4941 #endif 4942 { 4943 .procname = "disable_ipv6", 4944 .data = &ipv6_devconf.disable_ipv6, 4945 .maxlen = sizeof(int), 4946 .mode = 0644, 4947 .proc_handler = addrconf_sysctl_disable, 4948 }, 4949 { 4950 .procname = "accept_dad", 4951 .data = &ipv6_devconf.accept_dad, 4952 .maxlen = sizeof(int), 4953 .mode = 0644, 4954 .proc_handler = proc_dointvec, 4955 }, 4956 { 4957 .procname = "force_tllao", 4958 .data = &ipv6_devconf.force_tllao, 4959 .maxlen = sizeof(int), 4960 .mode = 0644, 4961 .proc_handler = proc_dointvec 4962 }, 4963 { 4964 .procname = "ndisc_notify", 4965 .data = &ipv6_devconf.ndisc_notify, 4966 .maxlen = sizeof(int), 4967 .mode = 0644, 4968 .proc_handler = proc_dointvec 4969 }, 4970 { 4971 .procname = "suppress_frag_ndisc", 4972 .data = &ipv6_devconf.suppress_frag_ndisc, 4973 .maxlen = sizeof(int), 4974 .mode = 0644, 4975 .proc_handler = proc_dointvec 4976 }, 4977 { 4978 /* sentinel */ 4979 } 4980 }, 4981 }; 4982 4983 static int __addrconf_sysctl_register(struct net *net, char *dev_name, 4984 struct inet6_dev *idev, struct ipv6_devconf *p) 4985 { 4986 int i; 4987 struct addrconf_sysctl_table *t; 4988 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ]; 4989 4990 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL); 4991 if (t == NULL) 4992 goto out; 4993 4994 for (i = 0; t->addrconf_vars[i].data; i++) { 4995 t->addrconf_vars[i].data += (char *)p - (char *)&ipv6_devconf; 4996 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */ 4997 t->addrconf_vars[i].extra2 = net; 4998 } 4999 5000 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name); 5001 5002 t->sysctl_header = register_net_sysctl(net, path, t->addrconf_vars); 5003 if (t->sysctl_header == NULL) 5004 goto free; 5005 5006 p->sysctl = t; 5007 return 0; 5008 5009 free: 5010 kfree(t); 5011 out: 5012 return -ENOBUFS; 5013 } 5014 5015 static void __addrconf_sysctl_unregister(struct ipv6_devconf *p) 5016 { 5017 struct addrconf_sysctl_table *t; 5018 5019 if (p->sysctl == NULL) 5020 return; 5021 5022 t = p->sysctl; 5023 p->sysctl = NULL; 5024 unregister_net_sysctl_table(t->sysctl_header); 5025 kfree(t); 5026 } 5027 5028 static void addrconf_sysctl_register(struct inet6_dev *idev) 5029 { 5030 neigh_sysctl_register(idev->dev, idev->nd_parms, "ipv6", 5031 &ndisc_ifinfo_sysctl_change); 5032 __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name, 5033 idev, &idev->cnf); 5034 } 5035 5036 static void addrconf_sysctl_unregister(struct inet6_dev *idev) 5037 { 5038 __addrconf_sysctl_unregister(&idev->cnf); 5039 neigh_sysctl_unregister(idev->nd_parms); 5040 } 5041 5042 5043 #endif 5044 5045 static int __net_init addrconf_init_net(struct net *net) 5046 { 5047 int err = -ENOMEM; 5048 struct ipv6_devconf *all, *dflt; 5049 5050 all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL); 5051 if (all == NULL) 5052 goto err_alloc_all; 5053 5054 dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL); 5055 if (dflt == NULL) 5056 goto err_alloc_dflt; 5057 5058 /* these will be inherited by all namespaces */ 5059 dflt->autoconf = ipv6_defaults.autoconf; 5060 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6; 5061 5062 net->ipv6.devconf_all = all; 5063 net->ipv6.devconf_dflt = dflt; 5064 5065 #ifdef CONFIG_SYSCTL 5066 err = __addrconf_sysctl_register(net, "all", NULL, all); 5067 if (err < 0) 5068 goto err_reg_all; 5069 5070 err = __addrconf_sysctl_register(net, "default", NULL, dflt); 5071 if (err < 0) 5072 goto err_reg_dflt; 5073 #endif 5074 return 0; 5075 5076 #ifdef CONFIG_SYSCTL 5077 err_reg_dflt: 5078 __addrconf_sysctl_unregister(all); 5079 err_reg_all: 5080 kfree(dflt); 5081 #endif 5082 err_alloc_dflt: 5083 kfree(all); 5084 err_alloc_all: 5085 return err; 5086 } 5087 5088 static void __net_exit addrconf_exit_net(struct net *net) 5089 { 5090 #ifdef CONFIG_SYSCTL 5091 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt); 5092 __addrconf_sysctl_unregister(net->ipv6.devconf_all); 5093 #endif 5094 if (!net_eq(net, &init_net)) { 5095 kfree(net->ipv6.devconf_dflt); 5096 kfree(net->ipv6.devconf_all); 5097 } 5098 } 5099 5100 static struct pernet_operations addrconf_ops = { 5101 .init = addrconf_init_net, 5102 .exit = addrconf_exit_net, 5103 }; 5104 5105 static struct rtnl_af_ops inet6_ops = { 5106 .family = AF_INET6, 5107 .fill_link_af = inet6_fill_link_af, 5108 .get_link_af_size = inet6_get_link_af_size, 5109 .set_link_af = inet6_set_link_af, 5110 }; 5111 5112 /* 5113 * Init / cleanup code 5114 */ 5115 5116 int __init addrconf_init(void) 5117 { 5118 int i, err; 5119 5120 err = ipv6_addr_label_init(); 5121 if (err < 0) { 5122 pr_crit("%s: cannot initialize default policy table: %d\n", 5123 __func__, err); 5124 goto out; 5125 } 5126 5127 err = register_pernet_subsys(&addrconf_ops); 5128 if (err < 0) 5129 goto out_addrlabel; 5130 5131 /* The addrconf netdev notifier requires that loopback_dev 5132 * has it's ipv6 private information allocated and setup 5133 * before it can bring up and give link-local addresses 5134 * to other devices which are up. 5135 * 5136 * Unfortunately, loopback_dev is not necessarily the first 5137 * entry in the global dev_base list of net devices. In fact, 5138 * it is likely to be the very last entry on that list. 5139 * So this causes the notifier registry below to try and 5140 * give link-local addresses to all devices besides loopback_dev 5141 * first, then loopback_dev, which cases all the non-loopback_dev 5142 * devices to fail to get a link-local address. 5143 * 5144 * So, as a temporary fix, allocate the ipv6 structure for 5145 * loopback_dev first by hand. 5146 * Longer term, all of the dependencies ipv6 has upon the loopback 5147 * device and it being up should be removed. 5148 */ 5149 rtnl_lock(); 5150 if (!ipv6_add_dev(init_net.loopback_dev)) 5151 err = -ENOMEM; 5152 rtnl_unlock(); 5153 if (err) 5154 goto errlo; 5155 5156 for (i = 0; i < IN6_ADDR_HSIZE; i++) 5157 INIT_HLIST_HEAD(&inet6_addr_lst[i]); 5158 5159 register_netdevice_notifier(&ipv6_dev_notf); 5160 5161 addrconf_verify(0); 5162 5163 err = rtnl_af_register(&inet6_ops); 5164 if (err < 0) 5165 goto errout_af; 5166 5167 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo, 5168 NULL); 5169 if (err < 0) 5170 goto errout; 5171 5172 /* Only the first call to __rtnl_register can fail */ 5173 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL, NULL); 5174 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL, NULL); 5175 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr, 5176 inet6_dump_ifaddr, NULL); 5177 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL, 5178 inet6_dump_ifmcaddr, NULL); 5179 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL, 5180 inet6_dump_ifacaddr, NULL); 5181 __rtnl_register(PF_INET6, RTM_GETNETCONF, inet6_netconf_get_devconf, 5182 inet6_netconf_dump_devconf, NULL); 5183 5184 ipv6_addr_label_rtnl_register(); 5185 5186 return 0; 5187 errout: 5188 rtnl_af_unregister(&inet6_ops); 5189 errout_af: 5190 unregister_netdevice_notifier(&ipv6_dev_notf); 5191 errlo: 5192 unregister_pernet_subsys(&addrconf_ops); 5193 out_addrlabel: 5194 ipv6_addr_label_cleanup(); 5195 out: 5196 return err; 5197 } 5198 5199 void addrconf_cleanup(void) 5200 { 5201 struct net_device *dev; 5202 int i; 5203 5204 unregister_netdevice_notifier(&ipv6_dev_notf); 5205 unregister_pernet_subsys(&addrconf_ops); 5206 ipv6_addr_label_cleanup(); 5207 5208 rtnl_lock(); 5209 5210 __rtnl_af_unregister(&inet6_ops); 5211 5212 /* clean dev list */ 5213 for_each_netdev(&init_net, dev) { 5214 if (__in6_dev_get(dev) == NULL) 5215 continue; 5216 addrconf_ifdown(dev, 1); 5217 } 5218 addrconf_ifdown(init_net.loopback_dev, 2); 5219 5220 /* 5221 * Check hash table. 5222 */ 5223 spin_lock_bh(&addrconf_hash_lock); 5224 for (i = 0; i < IN6_ADDR_HSIZE; i++) 5225 WARN_ON(!hlist_empty(&inet6_addr_lst[i])); 5226 spin_unlock_bh(&addrconf_hash_lock); 5227 5228 del_timer(&addr_chk_timer); 5229 rtnl_unlock(); 5230 } 5231