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(x) printk x 103 #else 104 #define ADBG(x) 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 .dad_transmits = 1, 181 .rtr_solicits = MAX_RTR_SOLICITATIONS, 182 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL, 183 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY, 184 #ifdef CONFIG_IPV6_PRIVACY 185 .use_tempaddr = 0, 186 .temp_valid_lft = TEMP_VALID_LIFETIME, 187 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME, 188 .regen_max_retry = REGEN_MAX_RETRY, 189 .max_desync_factor = MAX_DESYNC_FACTOR, 190 #endif 191 .max_addresses = IPV6_MAX_ADDRESSES, 192 .accept_ra_defrtr = 1, 193 .accept_ra_pinfo = 1, 194 #ifdef CONFIG_IPV6_ROUTER_PREF 195 .accept_ra_rtr_pref = 1, 196 .rtr_probe_interval = 60 * HZ, 197 #ifdef CONFIG_IPV6_ROUTE_INFO 198 .accept_ra_rt_info_max_plen = 0, 199 #endif 200 #endif 201 .proxy_ndp = 0, 202 .accept_source_route = 0, /* we do not accept RH0 by default. */ 203 .disable_ipv6 = 0, 204 .accept_dad = 1, 205 }; 206 207 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = { 208 .forwarding = 0, 209 .hop_limit = IPV6_DEFAULT_HOPLIMIT, 210 .mtu6 = IPV6_MIN_MTU, 211 .accept_ra = 1, 212 .accept_redirects = 1, 213 .autoconf = 1, 214 .dad_transmits = 1, 215 .rtr_solicits = MAX_RTR_SOLICITATIONS, 216 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL, 217 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY, 218 #ifdef CONFIG_IPV6_PRIVACY 219 .use_tempaddr = 0, 220 .temp_valid_lft = TEMP_VALID_LIFETIME, 221 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME, 222 .regen_max_retry = REGEN_MAX_RETRY, 223 .max_desync_factor = MAX_DESYNC_FACTOR, 224 #endif 225 .max_addresses = IPV6_MAX_ADDRESSES, 226 .accept_ra_defrtr = 1, 227 .accept_ra_pinfo = 1, 228 #ifdef CONFIG_IPV6_ROUTER_PREF 229 .accept_ra_rtr_pref = 1, 230 .rtr_probe_interval = 60 * HZ, 231 #ifdef CONFIG_IPV6_ROUTE_INFO 232 .accept_ra_rt_info_max_plen = 0, 233 #endif 234 #endif 235 .proxy_ndp = 0, 236 .accept_source_route = 0, /* we do not accept RH0 by default. */ 237 .disable_ipv6 = 0, 238 .accept_dad = 1, 239 }; 240 241 /* IPv6 Wildcard Address and Loopback Address defined by RFC2553 */ 242 const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT; 243 const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT; 244 const struct in6_addr in6addr_linklocal_allnodes = IN6ADDR_LINKLOCAL_ALLNODES_INIT; 245 const struct in6_addr in6addr_linklocal_allrouters = IN6ADDR_LINKLOCAL_ALLROUTERS_INIT; 246 const struct in6_addr in6addr_interfacelocal_allnodes = IN6ADDR_INTERFACELOCAL_ALLNODES_INIT; 247 const struct in6_addr in6addr_interfacelocal_allrouters = IN6ADDR_INTERFACELOCAL_ALLROUTERS_INIT; 248 const struct in6_addr in6addr_sitelocal_allrouters = IN6ADDR_SITELOCAL_ALLROUTERS_INIT; 249 250 /* Check if a valid qdisc is available */ 251 static inline bool addrconf_qdisc_ok(const struct net_device *dev) 252 { 253 return !qdisc_tx_is_noop(dev); 254 } 255 256 static void addrconf_del_timer(struct inet6_ifaddr *ifp) 257 { 258 if (del_timer(&ifp->timer)) 259 __in6_ifa_put(ifp); 260 } 261 262 enum addrconf_timer_t { 263 AC_NONE, 264 AC_DAD, 265 AC_RS, 266 }; 267 268 static void addrconf_mod_timer(struct inet6_ifaddr *ifp, 269 enum addrconf_timer_t what, 270 unsigned long when) 271 { 272 if (!del_timer(&ifp->timer)) 273 in6_ifa_hold(ifp); 274 275 switch (what) { 276 case AC_DAD: 277 ifp->timer.function = addrconf_dad_timer; 278 break; 279 case AC_RS: 280 ifp->timer.function = addrconf_rs_timer; 281 break; 282 default: 283 break; 284 } 285 ifp->timer.expires = jiffies + when; 286 add_timer(&ifp->timer); 287 } 288 289 static int snmp6_alloc_dev(struct inet6_dev *idev) 290 { 291 if (snmp_mib_init((void __percpu **)idev->stats.ipv6, 292 sizeof(struct ipstats_mib), 293 __alignof__(struct ipstats_mib)) < 0) 294 goto err_ip; 295 idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device), 296 GFP_KERNEL); 297 if (!idev->stats.icmpv6dev) 298 goto err_icmp; 299 idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device), 300 GFP_KERNEL); 301 if (!idev->stats.icmpv6msgdev) 302 goto err_icmpmsg; 303 304 return 0; 305 306 err_icmpmsg: 307 kfree(idev->stats.icmpv6dev); 308 err_icmp: 309 snmp_mib_free((void __percpu **)idev->stats.ipv6); 310 err_ip: 311 return -ENOMEM; 312 } 313 314 static void snmp6_free_dev(struct inet6_dev *idev) 315 { 316 kfree(idev->stats.icmpv6msgdev); 317 kfree(idev->stats.icmpv6dev); 318 snmp_mib_free((void __percpu **)idev->stats.ipv6); 319 } 320 321 /* Nobody refers to this device, we may destroy it. */ 322 323 void in6_dev_finish_destroy(struct inet6_dev *idev) 324 { 325 struct net_device *dev = idev->dev; 326 327 WARN_ON(!list_empty(&idev->addr_list)); 328 WARN_ON(idev->mc_list != NULL); 329 330 #ifdef NET_REFCNT_DEBUG 331 pr_debug("%s: %s\n", __func__, dev ? dev->name : "NIL"); 332 #endif 333 dev_put(dev); 334 if (!idev->dead) { 335 pr_warn("Freeing alive inet6 device %p\n", idev); 336 return; 337 } 338 snmp6_free_dev(idev); 339 kfree_rcu(idev, rcu); 340 } 341 EXPORT_SYMBOL(in6_dev_finish_destroy); 342 343 static struct inet6_dev *ipv6_add_dev(struct net_device *dev) 344 { 345 struct inet6_dev *ndev; 346 347 ASSERT_RTNL(); 348 349 if (dev->mtu < IPV6_MIN_MTU) 350 return NULL; 351 352 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL); 353 354 if (ndev == NULL) 355 return NULL; 356 357 rwlock_init(&ndev->lock); 358 ndev->dev = dev; 359 INIT_LIST_HEAD(&ndev->addr_list); 360 361 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf)); 362 ndev->cnf.mtu6 = dev->mtu; 363 ndev->cnf.sysctl = NULL; 364 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl); 365 if (ndev->nd_parms == NULL) { 366 kfree(ndev); 367 return NULL; 368 } 369 if (ndev->cnf.forwarding) 370 dev_disable_lro(dev); 371 /* We refer to the device */ 372 dev_hold(dev); 373 374 if (snmp6_alloc_dev(ndev) < 0) { 375 ADBG((KERN_WARNING 376 "%s: cannot allocate memory for statistics; dev=%s.\n", 377 __func__, dev->name)); 378 neigh_parms_release(&nd_tbl, ndev->nd_parms); 379 dev_put(dev); 380 kfree(ndev); 381 return NULL; 382 } 383 384 if (snmp6_register_dev(ndev) < 0) { 385 ADBG((KERN_WARNING 386 "%s: cannot create /proc/net/dev_snmp6/%s\n", 387 __func__, dev->name)); 388 neigh_parms_release(&nd_tbl, ndev->nd_parms); 389 ndev->dead = 1; 390 in6_dev_finish_destroy(ndev); 391 return NULL; 392 } 393 394 /* One reference from device. We must do this before 395 * we invoke __ipv6_regen_rndid(). 396 */ 397 in6_dev_hold(ndev); 398 399 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK)) 400 ndev->cnf.accept_dad = -1; 401 402 #if IS_ENABLED(CONFIG_IPV6_SIT) 403 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) { 404 pr_info("%s: Disabled Multicast RS\n", dev->name); 405 ndev->cnf.rtr_solicits = 0; 406 } 407 #endif 408 409 #ifdef CONFIG_IPV6_PRIVACY 410 INIT_LIST_HEAD(&ndev->tempaddr_list); 411 setup_timer(&ndev->regen_timer, ipv6_regen_rndid, (unsigned long)ndev); 412 if ((dev->flags&IFF_LOOPBACK) || 413 dev->type == ARPHRD_TUNNEL || 414 dev->type == ARPHRD_TUNNEL6 || 415 dev->type == ARPHRD_SIT || 416 dev->type == ARPHRD_NONE) { 417 ndev->cnf.use_tempaddr = -1; 418 } else { 419 in6_dev_hold(ndev); 420 ipv6_regen_rndid((unsigned long) ndev); 421 } 422 #endif 423 ndev->token = in6addr_any; 424 425 if (netif_running(dev) && addrconf_qdisc_ok(dev)) 426 ndev->if_flags |= IF_READY; 427 428 ipv6_mc_init_dev(ndev); 429 ndev->tstamp = jiffies; 430 addrconf_sysctl_register(ndev); 431 /* protected by rtnl_lock */ 432 rcu_assign_pointer(dev->ip6_ptr, ndev); 433 434 /* Join interface-local all-node multicast group */ 435 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allnodes); 436 437 /* Join all-node multicast group */ 438 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes); 439 440 /* Join all-router multicast group if forwarding is set */ 441 if (ndev->cnf.forwarding && (dev->flags & IFF_MULTICAST)) 442 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters); 443 444 return ndev; 445 } 446 447 static struct inet6_dev *ipv6_find_idev(struct net_device *dev) 448 { 449 struct inet6_dev *idev; 450 451 ASSERT_RTNL(); 452 453 idev = __in6_dev_get(dev); 454 if (!idev) { 455 idev = ipv6_add_dev(dev); 456 if (!idev) 457 return NULL; 458 } 459 460 if (dev->flags&IFF_UP) 461 ipv6_mc_up(idev); 462 return idev; 463 } 464 465 static int inet6_netconf_msgsize_devconf(int type) 466 { 467 int size = NLMSG_ALIGN(sizeof(struct netconfmsg)) 468 + nla_total_size(4); /* NETCONFA_IFINDEX */ 469 470 /* type -1 is used for ALL */ 471 if (type == -1 || type == NETCONFA_FORWARDING) 472 size += nla_total_size(4); 473 #ifdef CONFIG_IPV6_MROUTE 474 if (type == -1 || type == NETCONFA_MC_FORWARDING) 475 size += nla_total_size(4); 476 #endif 477 478 return size; 479 } 480 481 static int inet6_netconf_fill_devconf(struct sk_buff *skb, int ifindex, 482 struct ipv6_devconf *devconf, u32 portid, 483 u32 seq, int event, unsigned int flags, 484 int type) 485 { 486 struct nlmsghdr *nlh; 487 struct netconfmsg *ncm; 488 489 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg), 490 flags); 491 if (nlh == NULL) 492 return -EMSGSIZE; 493 494 ncm = nlmsg_data(nlh); 495 ncm->ncm_family = AF_INET6; 496 497 if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0) 498 goto nla_put_failure; 499 500 /* type -1 is used for ALL */ 501 if ((type == -1 || type == NETCONFA_FORWARDING) && 502 nla_put_s32(skb, NETCONFA_FORWARDING, devconf->forwarding) < 0) 503 goto nla_put_failure; 504 #ifdef CONFIG_IPV6_MROUTE 505 if ((type == -1 || type == NETCONFA_MC_FORWARDING) && 506 nla_put_s32(skb, NETCONFA_MC_FORWARDING, 507 devconf->mc_forwarding) < 0) 508 goto nla_put_failure; 509 #endif 510 return nlmsg_end(skb, nlh); 511 512 nla_put_failure: 513 nlmsg_cancel(skb, nlh); 514 return -EMSGSIZE; 515 } 516 517 void inet6_netconf_notify_devconf(struct net *net, int type, int ifindex, 518 struct ipv6_devconf *devconf) 519 { 520 struct sk_buff *skb; 521 int err = -ENOBUFS; 522 523 skb = nlmsg_new(inet6_netconf_msgsize_devconf(type), GFP_ATOMIC); 524 if (skb == NULL) 525 goto errout; 526 527 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 0, 0, 528 RTM_NEWNETCONF, 0, type); 529 if (err < 0) { 530 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */ 531 WARN_ON(err == -EMSGSIZE); 532 kfree_skb(skb); 533 goto errout; 534 } 535 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_NETCONF, NULL, GFP_ATOMIC); 536 return; 537 errout: 538 rtnl_set_sk_err(net, RTNLGRP_IPV6_NETCONF, err); 539 } 540 541 static const struct nla_policy devconf_ipv6_policy[NETCONFA_MAX+1] = { 542 [NETCONFA_IFINDEX] = { .len = sizeof(int) }, 543 [NETCONFA_FORWARDING] = { .len = sizeof(int) }, 544 }; 545 546 static int inet6_netconf_get_devconf(struct sk_buff *in_skb, 547 struct nlmsghdr *nlh) 548 { 549 struct net *net = sock_net(in_skb->sk); 550 struct nlattr *tb[NETCONFA_MAX+1]; 551 struct netconfmsg *ncm; 552 struct sk_buff *skb; 553 struct ipv6_devconf *devconf; 554 struct inet6_dev *in6_dev; 555 struct net_device *dev; 556 int ifindex; 557 int err; 558 559 err = nlmsg_parse(nlh, sizeof(*ncm), tb, NETCONFA_MAX, 560 devconf_ipv6_policy); 561 if (err < 0) 562 goto errout; 563 564 err = EINVAL; 565 if (!tb[NETCONFA_IFINDEX]) 566 goto errout; 567 568 ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]); 569 switch (ifindex) { 570 case NETCONFA_IFINDEX_ALL: 571 devconf = net->ipv6.devconf_all; 572 break; 573 case NETCONFA_IFINDEX_DEFAULT: 574 devconf = net->ipv6.devconf_dflt; 575 break; 576 default: 577 dev = __dev_get_by_index(net, ifindex); 578 if (dev == NULL) 579 goto errout; 580 in6_dev = __in6_dev_get(dev); 581 if (in6_dev == NULL) 582 goto errout; 583 devconf = &in6_dev->cnf; 584 break; 585 } 586 587 err = -ENOBUFS; 588 skb = nlmsg_new(inet6_netconf_msgsize_devconf(-1), GFP_ATOMIC); 589 if (skb == NULL) 590 goto errout; 591 592 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 593 NETLINK_CB(in_skb).portid, 594 nlh->nlmsg_seq, RTM_NEWNETCONF, 0, 595 -1); 596 if (err < 0) { 597 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */ 598 WARN_ON(err == -EMSGSIZE); 599 kfree_skb(skb); 600 goto errout; 601 } 602 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid); 603 errout: 604 return err; 605 } 606 607 static int inet6_netconf_dump_devconf(struct sk_buff *skb, 608 struct netlink_callback *cb) 609 { 610 struct net *net = sock_net(skb->sk); 611 int h, s_h; 612 int idx, s_idx; 613 struct net_device *dev; 614 struct inet6_dev *idev; 615 struct hlist_head *head; 616 617 s_h = cb->args[0]; 618 s_idx = idx = cb->args[1]; 619 620 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 621 idx = 0; 622 head = &net->dev_index_head[h]; 623 rcu_read_lock(); 624 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ 625 net->dev_base_seq; 626 hlist_for_each_entry_rcu(dev, head, index_hlist) { 627 if (idx < s_idx) 628 goto cont; 629 idev = __in6_dev_get(dev); 630 if (!idev) 631 goto cont; 632 633 if (inet6_netconf_fill_devconf(skb, dev->ifindex, 634 &idev->cnf, 635 NETLINK_CB(cb->skb).portid, 636 cb->nlh->nlmsg_seq, 637 RTM_NEWNETCONF, 638 NLM_F_MULTI, 639 -1) <= 0) { 640 rcu_read_unlock(); 641 goto done; 642 } 643 nl_dump_check_consistent(cb, nlmsg_hdr(skb)); 644 cont: 645 idx++; 646 } 647 rcu_read_unlock(); 648 } 649 if (h == NETDEV_HASHENTRIES) { 650 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL, 651 net->ipv6.devconf_all, 652 NETLINK_CB(cb->skb).portid, 653 cb->nlh->nlmsg_seq, 654 RTM_NEWNETCONF, NLM_F_MULTI, 655 -1) <= 0) 656 goto done; 657 else 658 h++; 659 } 660 if (h == NETDEV_HASHENTRIES + 1) { 661 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT, 662 net->ipv6.devconf_dflt, 663 NETLINK_CB(cb->skb).portid, 664 cb->nlh->nlmsg_seq, 665 RTM_NEWNETCONF, NLM_F_MULTI, 666 -1) <= 0) 667 goto done; 668 else 669 h++; 670 } 671 done: 672 cb->args[0] = h; 673 cb->args[1] = idx; 674 675 return skb->len; 676 } 677 678 #ifdef CONFIG_SYSCTL 679 static void dev_forward_change(struct inet6_dev *idev) 680 { 681 struct net_device *dev; 682 struct inet6_ifaddr *ifa; 683 684 if (!idev) 685 return; 686 dev = idev->dev; 687 if (idev->cnf.forwarding) 688 dev_disable_lro(dev); 689 if (dev->flags & IFF_MULTICAST) { 690 if (idev->cnf.forwarding) { 691 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters); 692 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allrouters); 693 ipv6_dev_mc_inc(dev, &in6addr_sitelocal_allrouters); 694 } else { 695 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters); 696 ipv6_dev_mc_dec(dev, &in6addr_interfacelocal_allrouters); 697 ipv6_dev_mc_dec(dev, &in6addr_sitelocal_allrouters); 698 } 699 } 700 701 list_for_each_entry(ifa, &idev->addr_list, if_list) { 702 if (ifa->flags&IFA_F_TENTATIVE) 703 continue; 704 if (idev->cnf.forwarding) 705 addrconf_join_anycast(ifa); 706 else 707 addrconf_leave_anycast(ifa); 708 } 709 inet6_netconf_notify_devconf(dev_net(dev), NETCONFA_FORWARDING, 710 dev->ifindex, &idev->cnf); 711 } 712 713 714 static void addrconf_forward_change(struct net *net, __s32 newf) 715 { 716 struct net_device *dev; 717 struct inet6_dev *idev; 718 719 for_each_netdev(net, dev) { 720 idev = __in6_dev_get(dev); 721 if (idev) { 722 int changed = (!idev->cnf.forwarding) ^ (!newf); 723 idev->cnf.forwarding = newf; 724 if (changed) 725 dev_forward_change(idev); 726 } 727 } 728 } 729 730 static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf) 731 { 732 struct net *net; 733 int old; 734 735 if (!rtnl_trylock()) 736 return restart_syscall(); 737 738 net = (struct net *)table->extra2; 739 old = *p; 740 *p = newf; 741 742 if (p == &net->ipv6.devconf_dflt->forwarding) { 743 if ((!newf) ^ (!old)) 744 inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING, 745 NETCONFA_IFINDEX_DEFAULT, 746 net->ipv6.devconf_dflt); 747 rtnl_unlock(); 748 return 0; 749 } 750 751 if (p == &net->ipv6.devconf_all->forwarding) { 752 net->ipv6.devconf_dflt->forwarding = newf; 753 addrconf_forward_change(net, newf); 754 if ((!newf) ^ (!old)) 755 inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING, 756 NETCONFA_IFINDEX_ALL, 757 net->ipv6.devconf_all); 758 } else if ((!newf) ^ (!old)) 759 dev_forward_change((struct inet6_dev *)table->extra1); 760 rtnl_unlock(); 761 762 if (newf) 763 rt6_purge_dflt_routers(net); 764 return 1; 765 } 766 #endif 767 768 /* Nobody refers to this ifaddr, destroy it */ 769 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp) 770 { 771 WARN_ON(!hlist_unhashed(&ifp->addr_lst)); 772 773 #ifdef NET_REFCNT_DEBUG 774 pr_debug("%s\n", __func__); 775 #endif 776 777 in6_dev_put(ifp->idev); 778 779 if (del_timer(&ifp->timer)) 780 pr_notice("Timer is still running, when freeing ifa=%p\n", ifp); 781 782 if (ifp->state != INET6_IFADDR_STATE_DEAD) { 783 pr_warn("Freeing alive inet6 address %p\n", ifp); 784 return; 785 } 786 ip6_rt_put(ifp->rt); 787 788 kfree_rcu(ifp, rcu); 789 } 790 791 static void 792 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp) 793 { 794 struct list_head *p; 795 int ifp_scope = ipv6_addr_src_scope(&ifp->addr); 796 797 /* 798 * Each device address list is sorted in order of scope - 799 * global before linklocal. 800 */ 801 list_for_each(p, &idev->addr_list) { 802 struct inet6_ifaddr *ifa 803 = list_entry(p, struct inet6_ifaddr, if_list); 804 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr)) 805 break; 806 } 807 808 list_add_tail(&ifp->if_list, p); 809 } 810 811 static u32 inet6_addr_hash(const struct in6_addr *addr) 812 { 813 return hash_32(ipv6_addr_hash(addr), IN6_ADDR_HSIZE_SHIFT); 814 } 815 816 /* On success it returns ifp with increased reference count */ 817 818 static struct inet6_ifaddr * 819 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, int pfxlen, 820 int scope, u32 flags) 821 { 822 struct inet6_ifaddr *ifa = NULL; 823 struct rt6_info *rt; 824 unsigned int hash; 825 int err = 0; 826 int addr_type = ipv6_addr_type(addr); 827 828 if (addr_type == IPV6_ADDR_ANY || 829 addr_type & IPV6_ADDR_MULTICAST || 830 (!(idev->dev->flags & IFF_LOOPBACK) && 831 addr_type & IPV6_ADDR_LOOPBACK)) 832 return ERR_PTR(-EADDRNOTAVAIL); 833 834 rcu_read_lock_bh(); 835 if (idev->dead) { 836 err = -ENODEV; /*XXX*/ 837 goto out2; 838 } 839 840 if (idev->cnf.disable_ipv6) { 841 err = -EACCES; 842 goto out2; 843 } 844 845 spin_lock(&addrconf_hash_lock); 846 847 /* Ignore adding duplicate addresses on an interface */ 848 if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) { 849 ADBG(("ipv6_add_addr: already assigned\n")); 850 err = -EEXIST; 851 goto out; 852 } 853 854 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC); 855 856 if (ifa == NULL) { 857 ADBG(("ipv6_add_addr: malloc failed\n")); 858 err = -ENOBUFS; 859 goto out; 860 } 861 862 rt = addrconf_dst_alloc(idev, addr, false); 863 if (IS_ERR(rt)) { 864 err = PTR_ERR(rt); 865 goto out; 866 } 867 868 ifa->addr = *addr; 869 870 spin_lock_init(&ifa->lock); 871 spin_lock_init(&ifa->state_lock); 872 init_timer(&ifa->timer); 873 INIT_HLIST_NODE(&ifa->addr_lst); 874 ifa->timer.data = (unsigned long) ifa; 875 ifa->scope = scope; 876 ifa->prefix_len = pfxlen; 877 ifa->flags = flags | IFA_F_TENTATIVE; 878 ifa->cstamp = ifa->tstamp = jiffies; 879 ifa->tokenized = false; 880 881 ifa->rt = rt; 882 883 ifa->idev = idev; 884 in6_dev_hold(idev); 885 /* For caller */ 886 in6_ifa_hold(ifa); 887 888 /* Add to big hash table */ 889 hash = inet6_addr_hash(addr); 890 891 hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]); 892 spin_unlock(&addrconf_hash_lock); 893 894 write_lock(&idev->lock); 895 /* Add to inet6_dev unicast addr list. */ 896 ipv6_link_dev_addr(idev, ifa); 897 898 #ifdef CONFIG_IPV6_PRIVACY 899 if (ifa->flags&IFA_F_TEMPORARY) { 900 list_add(&ifa->tmp_list, &idev->tempaddr_list); 901 in6_ifa_hold(ifa); 902 } 903 #endif 904 905 in6_ifa_hold(ifa); 906 write_unlock(&idev->lock); 907 out2: 908 rcu_read_unlock_bh(); 909 910 if (likely(err == 0)) 911 inet6addr_notifier_call_chain(NETDEV_UP, ifa); 912 else { 913 kfree(ifa); 914 ifa = ERR_PTR(err); 915 } 916 917 return ifa; 918 out: 919 spin_unlock(&addrconf_hash_lock); 920 goto out2; 921 } 922 923 /* This function wants to get referenced ifp and releases it before return */ 924 925 static void ipv6_del_addr(struct inet6_ifaddr *ifp) 926 { 927 struct inet6_ifaddr *ifa, *ifn; 928 struct inet6_dev *idev = ifp->idev; 929 int state; 930 int deleted = 0, onlink = 0; 931 unsigned long expires = jiffies; 932 933 spin_lock_bh(&ifp->state_lock); 934 state = ifp->state; 935 ifp->state = INET6_IFADDR_STATE_DEAD; 936 spin_unlock_bh(&ifp->state_lock); 937 938 if (state == INET6_IFADDR_STATE_DEAD) 939 goto out; 940 941 spin_lock_bh(&addrconf_hash_lock); 942 hlist_del_init_rcu(&ifp->addr_lst); 943 spin_unlock_bh(&addrconf_hash_lock); 944 945 write_lock_bh(&idev->lock); 946 #ifdef CONFIG_IPV6_PRIVACY 947 if (ifp->flags&IFA_F_TEMPORARY) { 948 list_del(&ifp->tmp_list); 949 if (ifp->ifpub) { 950 in6_ifa_put(ifp->ifpub); 951 ifp->ifpub = NULL; 952 } 953 __in6_ifa_put(ifp); 954 } 955 #endif 956 957 list_for_each_entry_safe(ifa, ifn, &idev->addr_list, if_list) { 958 if (ifa == ifp) { 959 list_del_init(&ifp->if_list); 960 __in6_ifa_put(ifp); 961 962 if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0) 963 break; 964 deleted = 1; 965 continue; 966 } else if (ifp->flags & IFA_F_PERMANENT) { 967 if (ipv6_prefix_equal(&ifa->addr, &ifp->addr, 968 ifp->prefix_len)) { 969 if (ifa->flags & IFA_F_PERMANENT) { 970 onlink = 1; 971 if (deleted) 972 break; 973 } else { 974 unsigned long lifetime; 975 976 if (!onlink) 977 onlink = -1; 978 979 spin_lock(&ifa->lock); 980 981 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ); 982 /* 983 * Note: Because this address is 984 * not permanent, lifetime < 985 * LONG_MAX / HZ here. 986 */ 987 if (time_before(expires, 988 ifa->tstamp + lifetime * HZ)) 989 expires = ifa->tstamp + lifetime * HZ; 990 spin_unlock(&ifa->lock); 991 } 992 } 993 } 994 } 995 write_unlock_bh(&idev->lock); 996 997 addrconf_del_timer(ifp); 998 999 ipv6_ifa_notify(RTM_DELADDR, ifp); 1000 1001 inet6addr_notifier_call_chain(NETDEV_DOWN, ifp); 1002 1003 /* 1004 * Purge or update corresponding prefix 1005 * 1006 * 1) we don't purge prefix here if address was not permanent. 1007 * prefix is managed by its own lifetime. 1008 * 2) if there're no addresses, delete prefix. 1009 * 3) if there're still other permanent address(es), 1010 * corresponding prefix is still permanent. 1011 * 4) otherwise, update prefix lifetime to the 1012 * longest valid lifetime among the corresponding 1013 * addresses on the device. 1014 * Note: subsequent RA will update lifetime. 1015 * 1016 * --yoshfuji 1017 */ 1018 if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) { 1019 struct in6_addr prefix; 1020 struct rt6_info *rt; 1021 1022 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len); 1023 1024 rt = addrconf_get_prefix_route(&prefix, 1025 ifp->prefix_len, 1026 ifp->idev->dev, 1027 0, RTF_GATEWAY | RTF_DEFAULT); 1028 1029 if (rt) { 1030 if (onlink == 0) { 1031 ip6_del_rt(rt); 1032 rt = NULL; 1033 } else if (!(rt->rt6i_flags & RTF_EXPIRES)) { 1034 rt6_set_expires(rt, expires); 1035 } 1036 } 1037 ip6_rt_put(rt); 1038 } 1039 1040 /* clean up prefsrc entries */ 1041 rt6_remove_prefsrc(ifp); 1042 out: 1043 in6_ifa_put(ifp); 1044 } 1045 1046 #ifdef CONFIG_IPV6_PRIVACY 1047 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift) 1048 { 1049 struct inet6_dev *idev = ifp->idev; 1050 struct in6_addr addr, *tmpaddr; 1051 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_tstamp, age; 1052 unsigned long regen_advance; 1053 int tmp_plen; 1054 int ret = 0; 1055 int max_addresses; 1056 u32 addr_flags; 1057 unsigned long now = jiffies; 1058 1059 write_lock(&idev->lock); 1060 if (ift) { 1061 spin_lock_bh(&ift->lock); 1062 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8); 1063 spin_unlock_bh(&ift->lock); 1064 tmpaddr = &addr; 1065 } else { 1066 tmpaddr = NULL; 1067 } 1068 retry: 1069 in6_dev_hold(idev); 1070 if (idev->cnf.use_tempaddr <= 0) { 1071 write_unlock(&idev->lock); 1072 pr_info("%s: use_tempaddr is disabled\n", __func__); 1073 in6_dev_put(idev); 1074 ret = -1; 1075 goto out; 1076 } 1077 spin_lock_bh(&ifp->lock); 1078 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) { 1079 idev->cnf.use_tempaddr = -1; /*XXX*/ 1080 spin_unlock_bh(&ifp->lock); 1081 write_unlock(&idev->lock); 1082 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n", 1083 __func__); 1084 in6_dev_put(idev); 1085 ret = -1; 1086 goto out; 1087 } 1088 in6_ifa_hold(ifp); 1089 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8); 1090 __ipv6_try_regen_rndid(idev, tmpaddr); 1091 memcpy(&addr.s6_addr[8], idev->rndid, 8); 1092 age = (now - ifp->tstamp) / HZ; 1093 tmp_valid_lft = min_t(__u32, 1094 ifp->valid_lft, 1095 idev->cnf.temp_valid_lft + age); 1096 tmp_prefered_lft = min_t(__u32, 1097 ifp->prefered_lft, 1098 idev->cnf.temp_prefered_lft + age - 1099 idev->cnf.max_desync_factor); 1100 tmp_plen = ifp->prefix_len; 1101 max_addresses = idev->cnf.max_addresses; 1102 tmp_tstamp = ifp->tstamp; 1103 spin_unlock_bh(&ifp->lock); 1104 1105 regen_advance = idev->cnf.regen_max_retry * 1106 idev->cnf.dad_transmits * 1107 idev->nd_parms->retrans_time / HZ; 1108 write_unlock(&idev->lock); 1109 1110 /* A temporary address is created only if this calculated Preferred 1111 * Lifetime is greater than REGEN_ADVANCE time units. In particular, 1112 * an implementation must not create a temporary address with a zero 1113 * Preferred Lifetime. 1114 */ 1115 if (tmp_prefered_lft <= regen_advance) { 1116 in6_ifa_put(ifp); 1117 in6_dev_put(idev); 1118 ret = -1; 1119 goto out; 1120 } 1121 1122 addr_flags = IFA_F_TEMPORARY; 1123 /* set in addrconf_prefix_rcv() */ 1124 if (ifp->flags & IFA_F_OPTIMISTIC) 1125 addr_flags |= IFA_F_OPTIMISTIC; 1126 1127 ift = !max_addresses || 1128 ipv6_count_addresses(idev) < max_addresses ? 1129 ipv6_add_addr(idev, &addr, tmp_plen, ipv6_addr_scope(&addr), 1130 addr_flags) : NULL; 1131 if (IS_ERR_OR_NULL(ift)) { 1132 in6_ifa_put(ifp); 1133 in6_dev_put(idev); 1134 pr_info("%s: retry temporary address regeneration\n", __func__); 1135 tmpaddr = &addr; 1136 write_lock(&idev->lock); 1137 goto retry; 1138 } 1139 1140 spin_lock_bh(&ift->lock); 1141 ift->ifpub = ifp; 1142 ift->valid_lft = tmp_valid_lft; 1143 ift->prefered_lft = tmp_prefered_lft; 1144 ift->cstamp = now; 1145 ift->tstamp = tmp_tstamp; 1146 spin_unlock_bh(&ift->lock); 1147 1148 addrconf_dad_start(ift); 1149 in6_ifa_put(ift); 1150 in6_dev_put(idev); 1151 out: 1152 return ret; 1153 } 1154 #endif 1155 1156 /* 1157 * Choose an appropriate source address (RFC3484) 1158 */ 1159 enum { 1160 IPV6_SADDR_RULE_INIT = 0, 1161 IPV6_SADDR_RULE_LOCAL, 1162 IPV6_SADDR_RULE_SCOPE, 1163 IPV6_SADDR_RULE_PREFERRED, 1164 #ifdef CONFIG_IPV6_MIP6 1165 IPV6_SADDR_RULE_HOA, 1166 #endif 1167 IPV6_SADDR_RULE_OIF, 1168 IPV6_SADDR_RULE_LABEL, 1169 #ifdef CONFIG_IPV6_PRIVACY 1170 IPV6_SADDR_RULE_PRIVACY, 1171 #endif 1172 IPV6_SADDR_RULE_ORCHID, 1173 IPV6_SADDR_RULE_PREFIX, 1174 IPV6_SADDR_RULE_MAX 1175 }; 1176 1177 struct ipv6_saddr_score { 1178 int rule; 1179 int addr_type; 1180 struct inet6_ifaddr *ifa; 1181 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX); 1182 int scopedist; 1183 int matchlen; 1184 }; 1185 1186 struct ipv6_saddr_dst { 1187 const struct in6_addr *addr; 1188 int ifindex; 1189 int scope; 1190 int label; 1191 unsigned int prefs; 1192 }; 1193 1194 static inline int ipv6_saddr_preferred(int type) 1195 { 1196 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK)) 1197 return 1; 1198 return 0; 1199 } 1200 1201 static int ipv6_get_saddr_eval(struct net *net, 1202 struct ipv6_saddr_score *score, 1203 struct ipv6_saddr_dst *dst, 1204 int i) 1205 { 1206 int ret; 1207 1208 if (i <= score->rule) { 1209 switch (i) { 1210 case IPV6_SADDR_RULE_SCOPE: 1211 ret = score->scopedist; 1212 break; 1213 case IPV6_SADDR_RULE_PREFIX: 1214 ret = score->matchlen; 1215 break; 1216 default: 1217 ret = !!test_bit(i, score->scorebits); 1218 } 1219 goto out; 1220 } 1221 1222 switch (i) { 1223 case IPV6_SADDR_RULE_INIT: 1224 /* Rule 0: remember if hiscore is not ready yet */ 1225 ret = !!score->ifa; 1226 break; 1227 case IPV6_SADDR_RULE_LOCAL: 1228 /* Rule 1: Prefer same address */ 1229 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr); 1230 break; 1231 case IPV6_SADDR_RULE_SCOPE: 1232 /* Rule 2: Prefer appropriate scope 1233 * 1234 * ret 1235 * ^ 1236 * -1 | d 15 1237 * ---+--+-+---> scope 1238 * | 1239 * | d is scope of the destination. 1240 * B-d | \ 1241 * | \ <- smaller scope is better if 1242 * B-15 | \ if scope is enough for destinaion. 1243 * | ret = B - scope (-1 <= scope >= d <= 15). 1244 * d-C-1 | / 1245 * |/ <- greater is better 1246 * -C / if scope is not enough for destination. 1247 * /| ret = scope - C (-1 <= d < scope <= 15). 1248 * 1249 * d - C - 1 < B -15 (for all -1 <= d <= 15). 1250 * C > d + 14 - B >= 15 + 14 - B = 29 - B. 1251 * Assume B = 0 and we get C > 29. 1252 */ 1253 ret = __ipv6_addr_src_scope(score->addr_type); 1254 if (ret >= dst->scope) 1255 ret = -ret; 1256 else 1257 ret -= 128; /* 30 is enough */ 1258 score->scopedist = ret; 1259 break; 1260 case IPV6_SADDR_RULE_PREFERRED: 1261 /* Rule 3: Avoid deprecated and optimistic addresses */ 1262 ret = ipv6_saddr_preferred(score->addr_type) || 1263 !(score->ifa->flags & (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC)); 1264 break; 1265 #ifdef CONFIG_IPV6_MIP6 1266 case IPV6_SADDR_RULE_HOA: 1267 { 1268 /* Rule 4: Prefer home address */ 1269 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA); 1270 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome; 1271 break; 1272 } 1273 #endif 1274 case IPV6_SADDR_RULE_OIF: 1275 /* Rule 5: Prefer outgoing interface */ 1276 ret = (!dst->ifindex || 1277 dst->ifindex == score->ifa->idev->dev->ifindex); 1278 break; 1279 case IPV6_SADDR_RULE_LABEL: 1280 /* Rule 6: Prefer matching label */ 1281 ret = ipv6_addr_label(net, 1282 &score->ifa->addr, score->addr_type, 1283 score->ifa->idev->dev->ifindex) == dst->label; 1284 break; 1285 #ifdef CONFIG_IPV6_PRIVACY 1286 case IPV6_SADDR_RULE_PRIVACY: 1287 { 1288 /* Rule 7: Prefer public address 1289 * Note: prefer temporary address if use_tempaddr >= 2 1290 */ 1291 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ? 1292 !!(dst->prefs & IPV6_PREFER_SRC_TMP) : 1293 score->ifa->idev->cnf.use_tempaddr >= 2; 1294 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp; 1295 break; 1296 } 1297 #endif 1298 case IPV6_SADDR_RULE_ORCHID: 1299 /* Rule 8-: Prefer ORCHID vs ORCHID or 1300 * non-ORCHID vs non-ORCHID 1301 */ 1302 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^ 1303 ipv6_addr_orchid(dst->addr)); 1304 break; 1305 case IPV6_SADDR_RULE_PREFIX: 1306 /* Rule 8: Use longest matching prefix */ 1307 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr); 1308 if (ret > score->ifa->prefix_len) 1309 ret = score->ifa->prefix_len; 1310 score->matchlen = ret; 1311 break; 1312 default: 1313 ret = 0; 1314 } 1315 1316 if (ret) 1317 __set_bit(i, score->scorebits); 1318 score->rule = i; 1319 out: 1320 return ret; 1321 } 1322 1323 int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev, 1324 const struct in6_addr *daddr, unsigned int prefs, 1325 struct in6_addr *saddr) 1326 { 1327 struct ipv6_saddr_score scores[2], 1328 *score = &scores[0], *hiscore = &scores[1]; 1329 struct ipv6_saddr_dst dst; 1330 struct net_device *dev; 1331 int dst_type; 1332 1333 dst_type = __ipv6_addr_type(daddr); 1334 dst.addr = daddr; 1335 dst.ifindex = dst_dev ? dst_dev->ifindex : 0; 1336 dst.scope = __ipv6_addr_src_scope(dst_type); 1337 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex); 1338 dst.prefs = prefs; 1339 1340 hiscore->rule = -1; 1341 hiscore->ifa = NULL; 1342 1343 rcu_read_lock(); 1344 1345 for_each_netdev_rcu(net, dev) { 1346 struct inet6_dev *idev; 1347 1348 /* Candidate Source Address (section 4) 1349 * - multicast and link-local destination address, 1350 * the set of candidate source address MUST only 1351 * include addresses assigned to interfaces 1352 * belonging to the same link as the outgoing 1353 * interface. 1354 * (- For site-local destination addresses, the 1355 * set of candidate source addresses MUST only 1356 * include addresses assigned to interfaces 1357 * belonging to the same site as the outgoing 1358 * interface.) 1359 */ 1360 if (((dst_type & IPV6_ADDR_MULTICAST) || 1361 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL) && 1362 dst.ifindex && dev->ifindex != dst.ifindex) 1363 continue; 1364 1365 idev = __in6_dev_get(dev); 1366 if (!idev) 1367 continue; 1368 1369 read_lock_bh(&idev->lock); 1370 list_for_each_entry(score->ifa, &idev->addr_list, if_list) { 1371 int i; 1372 1373 /* 1374 * - Tentative Address (RFC2462 section 5.4) 1375 * - A tentative address is not considered 1376 * "assigned to an interface" in the traditional 1377 * sense, unless it is also flagged as optimistic. 1378 * - Candidate Source Address (section 4) 1379 * - In any case, anycast addresses, multicast 1380 * addresses, and the unspecified address MUST 1381 * NOT be included in a candidate set. 1382 */ 1383 if ((score->ifa->flags & IFA_F_TENTATIVE) && 1384 (!(score->ifa->flags & IFA_F_OPTIMISTIC))) 1385 continue; 1386 1387 score->addr_type = __ipv6_addr_type(&score->ifa->addr); 1388 1389 if (unlikely(score->addr_type == IPV6_ADDR_ANY || 1390 score->addr_type & IPV6_ADDR_MULTICAST)) { 1391 LIMIT_NETDEBUG(KERN_DEBUG 1392 "ADDRCONF: unspecified / multicast address " 1393 "assigned as unicast address on %s", 1394 dev->name); 1395 continue; 1396 } 1397 1398 score->rule = -1; 1399 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX); 1400 1401 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) { 1402 int minihiscore, miniscore; 1403 1404 minihiscore = ipv6_get_saddr_eval(net, hiscore, &dst, i); 1405 miniscore = ipv6_get_saddr_eval(net, score, &dst, i); 1406 1407 if (minihiscore > miniscore) { 1408 if (i == IPV6_SADDR_RULE_SCOPE && 1409 score->scopedist > 0) { 1410 /* 1411 * special case: 1412 * each remaining entry 1413 * has too small (not enough) 1414 * scope, because ifa entries 1415 * are sorted by their scope 1416 * values. 1417 */ 1418 goto try_nextdev; 1419 } 1420 break; 1421 } else if (minihiscore < miniscore) { 1422 if (hiscore->ifa) 1423 in6_ifa_put(hiscore->ifa); 1424 1425 in6_ifa_hold(score->ifa); 1426 1427 swap(hiscore, score); 1428 1429 /* restore our iterator */ 1430 score->ifa = hiscore->ifa; 1431 1432 break; 1433 } 1434 } 1435 } 1436 try_nextdev: 1437 read_unlock_bh(&idev->lock); 1438 } 1439 rcu_read_unlock(); 1440 1441 if (!hiscore->ifa) 1442 return -EADDRNOTAVAIL; 1443 1444 *saddr = hiscore->ifa->addr; 1445 in6_ifa_put(hiscore->ifa); 1446 return 0; 1447 } 1448 EXPORT_SYMBOL(ipv6_dev_get_saddr); 1449 1450 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr, 1451 unsigned char banned_flags) 1452 { 1453 struct inet6_dev *idev; 1454 int err = -EADDRNOTAVAIL; 1455 1456 rcu_read_lock(); 1457 idev = __in6_dev_get(dev); 1458 if (idev) { 1459 struct inet6_ifaddr *ifp; 1460 1461 read_lock_bh(&idev->lock); 1462 list_for_each_entry(ifp, &idev->addr_list, if_list) { 1463 if (ifp->scope == IFA_LINK && 1464 !(ifp->flags & banned_flags)) { 1465 *addr = ifp->addr; 1466 err = 0; 1467 break; 1468 } 1469 } 1470 read_unlock_bh(&idev->lock); 1471 } 1472 rcu_read_unlock(); 1473 return err; 1474 } 1475 1476 static int ipv6_count_addresses(struct inet6_dev *idev) 1477 { 1478 int cnt = 0; 1479 struct inet6_ifaddr *ifp; 1480 1481 read_lock_bh(&idev->lock); 1482 list_for_each_entry(ifp, &idev->addr_list, if_list) 1483 cnt++; 1484 read_unlock_bh(&idev->lock); 1485 return cnt; 1486 } 1487 1488 int ipv6_chk_addr(struct net *net, const struct in6_addr *addr, 1489 const struct net_device *dev, int strict) 1490 { 1491 struct inet6_ifaddr *ifp; 1492 unsigned int hash = inet6_addr_hash(addr); 1493 1494 rcu_read_lock_bh(); 1495 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) { 1496 if (!net_eq(dev_net(ifp->idev->dev), net)) 1497 continue; 1498 if (ipv6_addr_equal(&ifp->addr, addr) && 1499 !(ifp->flags&IFA_F_TENTATIVE) && 1500 (dev == NULL || ifp->idev->dev == dev || 1501 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) { 1502 rcu_read_unlock_bh(); 1503 return 1; 1504 } 1505 } 1506 1507 rcu_read_unlock_bh(); 1508 return 0; 1509 } 1510 EXPORT_SYMBOL(ipv6_chk_addr); 1511 1512 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr, 1513 struct net_device *dev) 1514 { 1515 unsigned int hash = inet6_addr_hash(addr); 1516 struct inet6_ifaddr *ifp; 1517 1518 hlist_for_each_entry(ifp, &inet6_addr_lst[hash], addr_lst) { 1519 if (!net_eq(dev_net(ifp->idev->dev), net)) 1520 continue; 1521 if (ipv6_addr_equal(&ifp->addr, addr)) { 1522 if (dev == NULL || ifp->idev->dev == dev) 1523 return true; 1524 } 1525 } 1526 return false; 1527 } 1528 1529 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev) 1530 { 1531 struct inet6_dev *idev; 1532 struct inet6_ifaddr *ifa; 1533 int onlink; 1534 1535 onlink = 0; 1536 rcu_read_lock(); 1537 idev = __in6_dev_get(dev); 1538 if (idev) { 1539 read_lock_bh(&idev->lock); 1540 list_for_each_entry(ifa, &idev->addr_list, if_list) { 1541 onlink = ipv6_prefix_equal(addr, &ifa->addr, 1542 ifa->prefix_len); 1543 if (onlink) 1544 break; 1545 } 1546 read_unlock_bh(&idev->lock); 1547 } 1548 rcu_read_unlock(); 1549 return onlink; 1550 } 1551 EXPORT_SYMBOL(ipv6_chk_prefix); 1552 1553 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr, 1554 struct net_device *dev, int strict) 1555 { 1556 struct inet6_ifaddr *ifp, *result = NULL; 1557 unsigned int hash = inet6_addr_hash(addr); 1558 1559 rcu_read_lock_bh(); 1560 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) { 1561 if (!net_eq(dev_net(ifp->idev->dev), net)) 1562 continue; 1563 if (ipv6_addr_equal(&ifp->addr, addr)) { 1564 if (dev == NULL || ifp->idev->dev == dev || 1565 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) { 1566 result = ifp; 1567 in6_ifa_hold(ifp); 1568 break; 1569 } 1570 } 1571 } 1572 rcu_read_unlock_bh(); 1573 1574 return result; 1575 } 1576 1577 /* Gets referenced address, destroys ifaddr */ 1578 1579 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed) 1580 { 1581 if (ifp->flags&IFA_F_PERMANENT) { 1582 spin_lock_bh(&ifp->lock); 1583 addrconf_del_timer(ifp); 1584 ifp->flags |= IFA_F_TENTATIVE; 1585 if (dad_failed) 1586 ifp->flags |= IFA_F_DADFAILED; 1587 spin_unlock_bh(&ifp->lock); 1588 if (dad_failed) 1589 ipv6_ifa_notify(0, ifp); 1590 in6_ifa_put(ifp); 1591 #ifdef CONFIG_IPV6_PRIVACY 1592 } else if (ifp->flags&IFA_F_TEMPORARY) { 1593 struct inet6_ifaddr *ifpub; 1594 spin_lock_bh(&ifp->lock); 1595 ifpub = ifp->ifpub; 1596 if (ifpub) { 1597 in6_ifa_hold(ifpub); 1598 spin_unlock_bh(&ifp->lock); 1599 ipv6_create_tempaddr(ifpub, ifp); 1600 in6_ifa_put(ifpub); 1601 } else { 1602 spin_unlock_bh(&ifp->lock); 1603 } 1604 ipv6_del_addr(ifp); 1605 #endif 1606 } else 1607 ipv6_del_addr(ifp); 1608 } 1609 1610 static int addrconf_dad_end(struct inet6_ifaddr *ifp) 1611 { 1612 int err = -ENOENT; 1613 1614 spin_lock(&ifp->state_lock); 1615 if (ifp->state == INET6_IFADDR_STATE_DAD) { 1616 ifp->state = INET6_IFADDR_STATE_POSTDAD; 1617 err = 0; 1618 } 1619 spin_unlock(&ifp->state_lock); 1620 1621 return err; 1622 } 1623 1624 void addrconf_dad_failure(struct inet6_ifaddr *ifp) 1625 { 1626 struct inet6_dev *idev = ifp->idev; 1627 1628 if (addrconf_dad_end(ifp)) { 1629 in6_ifa_put(ifp); 1630 return; 1631 } 1632 1633 net_info_ratelimited("%s: IPv6 duplicate address %pI6c detected!\n", 1634 ifp->idev->dev->name, &ifp->addr); 1635 1636 if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6) { 1637 struct in6_addr addr; 1638 1639 addr.s6_addr32[0] = htonl(0xfe800000); 1640 addr.s6_addr32[1] = 0; 1641 1642 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) && 1643 ipv6_addr_equal(&ifp->addr, &addr)) { 1644 /* DAD failed for link-local based on MAC address */ 1645 idev->cnf.disable_ipv6 = 1; 1646 1647 pr_info("%s: IPv6 being disabled!\n", 1648 ifp->idev->dev->name); 1649 } 1650 } 1651 1652 addrconf_dad_stop(ifp, 1); 1653 } 1654 1655 /* Join to solicited addr multicast group. */ 1656 1657 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr) 1658 { 1659 struct in6_addr maddr; 1660 1661 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP)) 1662 return; 1663 1664 addrconf_addr_solict_mult(addr, &maddr); 1665 ipv6_dev_mc_inc(dev, &maddr); 1666 } 1667 1668 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr) 1669 { 1670 struct in6_addr maddr; 1671 1672 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP)) 1673 return; 1674 1675 addrconf_addr_solict_mult(addr, &maddr); 1676 __ipv6_dev_mc_dec(idev, &maddr); 1677 } 1678 1679 static void addrconf_join_anycast(struct inet6_ifaddr *ifp) 1680 { 1681 struct in6_addr addr; 1682 if (ifp->prefix_len == 127) /* RFC 6164 */ 1683 return; 1684 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len); 1685 if (ipv6_addr_any(&addr)) 1686 return; 1687 ipv6_dev_ac_inc(ifp->idev->dev, &addr); 1688 } 1689 1690 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp) 1691 { 1692 struct in6_addr addr; 1693 if (ifp->prefix_len == 127) /* RFC 6164 */ 1694 return; 1695 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len); 1696 if (ipv6_addr_any(&addr)) 1697 return; 1698 __ipv6_dev_ac_dec(ifp->idev, &addr); 1699 } 1700 1701 static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev) 1702 { 1703 if (dev->addr_len != ETH_ALEN) 1704 return -1; 1705 memcpy(eui, dev->dev_addr, 3); 1706 memcpy(eui + 5, dev->dev_addr + 3, 3); 1707 1708 /* 1709 * The zSeries OSA network cards can be shared among various 1710 * OS instances, but the OSA cards have only one MAC address. 1711 * This leads to duplicate address conflicts in conjunction 1712 * with IPv6 if more than one instance uses the same card. 1713 * 1714 * The driver for these cards can deliver a unique 16-bit 1715 * identifier for each instance sharing the same card. It is 1716 * placed instead of 0xFFFE in the interface identifier. The 1717 * "u" bit of the interface identifier is not inverted in this 1718 * case. Hence the resulting interface identifier has local 1719 * scope according to RFC2373. 1720 */ 1721 if (dev->dev_id) { 1722 eui[3] = (dev->dev_id >> 8) & 0xFF; 1723 eui[4] = dev->dev_id & 0xFF; 1724 } else { 1725 eui[3] = 0xFF; 1726 eui[4] = 0xFE; 1727 eui[0] ^= 2; 1728 } 1729 return 0; 1730 } 1731 1732 static int addrconf_ifid_eui64(u8 *eui, struct net_device *dev) 1733 { 1734 if (dev->addr_len != IEEE802154_ADDR_LEN) 1735 return -1; 1736 memcpy(eui, dev->dev_addr, 8); 1737 eui[0] ^= 2; 1738 return 0; 1739 } 1740 1741 static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev) 1742 { 1743 union fwnet_hwaddr *ha; 1744 1745 if (dev->addr_len != FWNET_ALEN) 1746 return -1; 1747 1748 ha = (union fwnet_hwaddr *)dev->dev_addr; 1749 1750 memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id)); 1751 eui[0] ^= 2; 1752 return 0; 1753 } 1754 1755 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev) 1756 { 1757 /* XXX: inherit EUI-64 from other interface -- yoshfuji */ 1758 if (dev->addr_len != ARCNET_ALEN) 1759 return -1; 1760 memset(eui, 0, 7); 1761 eui[7] = *(u8 *)dev->dev_addr; 1762 return 0; 1763 } 1764 1765 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev) 1766 { 1767 if (dev->addr_len != INFINIBAND_ALEN) 1768 return -1; 1769 memcpy(eui, dev->dev_addr + 12, 8); 1770 eui[0] |= 2; 1771 return 0; 1772 } 1773 1774 static int __ipv6_isatap_ifid(u8 *eui, __be32 addr) 1775 { 1776 if (addr == 0) 1777 return -1; 1778 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) || 1779 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) || 1780 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) || 1781 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) || 1782 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) || 1783 ipv4_is_lbcast(addr)) ? 0x00 : 0x02; 1784 eui[1] = 0; 1785 eui[2] = 0x5E; 1786 eui[3] = 0xFE; 1787 memcpy(eui + 4, &addr, 4); 1788 return 0; 1789 } 1790 1791 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev) 1792 { 1793 if (dev->priv_flags & IFF_ISATAP) 1794 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr); 1795 return -1; 1796 } 1797 1798 static int addrconf_ifid_gre(u8 *eui, struct net_device *dev) 1799 { 1800 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr); 1801 } 1802 1803 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev) 1804 { 1805 switch (dev->type) { 1806 case ARPHRD_ETHER: 1807 case ARPHRD_FDDI: 1808 return addrconf_ifid_eui48(eui, dev); 1809 case ARPHRD_ARCNET: 1810 return addrconf_ifid_arcnet(eui, dev); 1811 case ARPHRD_INFINIBAND: 1812 return addrconf_ifid_infiniband(eui, dev); 1813 case ARPHRD_SIT: 1814 return addrconf_ifid_sit(eui, dev); 1815 case ARPHRD_IPGRE: 1816 return addrconf_ifid_gre(eui, dev); 1817 case ARPHRD_IEEE802154: 1818 return addrconf_ifid_eui64(eui, dev); 1819 case ARPHRD_IEEE1394: 1820 return addrconf_ifid_ieee1394(eui, dev); 1821 } 1822 return -1; 1823 } 1824 1825 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev) 1826 { 1827 int err = -1; 1828 struct inet6_ifaddr *ifp; 1829 1830 read_lock_bh(&idev->lock); 1831 list_for_each_entry(ifp, &idev->addr_list, if_list) { 1832 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) { 1833 memcpy(eui, ifp->addr.s6_addr+8, 8); 1834 err = 0; 1835 break; 1836 } 1837 } 1838 read_unlock_bh(&idev->lock); 1839 return err; 1840 } 1841 1842 #ifdef CONFIG_IPV6_PRIVACY 1843 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */ 1844 static void __ipv6_regen_rndid(struct inet6_dev *idev) 1845 { 1846 regen: 1847 get_random_bytes(idev->rndid, sizeof(idev->rndid)); 1848 idev->rndid[0] &= ~0x02; 1849 1850 /* 1851 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>: 1852 * check if generated address is not inappropriate 1853 * 1854 * - Reserved subnet anycast (RFC 2526) 1855 * 11111101 11....11 1xxxxxxx 1856 * - ISATAP (RFC4214) 6.1 1857 * 00-00-5E-FE-xx-xx-xx-xx 1858 * - value 0 1859 * - XXX: already assigned to an address on the device 1860 */ 1861 if (idev->rndid[0] == 0xfd && 1862 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff && 1863 (idev->rndid[7]&0x80)) 1864 goto regen; 1865 if ((idev->rndid[0]|idev->rndid[1]) == 0) { 1866 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe) 1867 goto regen; 1868 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00) 1869 goto regen; 1870 } 1871 } 1872 1873 static void ipv6_regen_rndid(unsigned long data) 1874 { 1875 struct inet6_dev *idev = (struct inet6_dev *) data; 1876 unsigned long expires; 1877 1878 rcu_read_lock_bh(); 1879 write_lock_bh(&idev->lock); 1880 1881 if (idev->dead) 1882 goto out; 1883 1884 __ipv6_regen_rndid(idev); 1885 1886 expires = jiffies + 1887 idev->cnf.temp_prefered_lft * HZ - 1888 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time - 1889 idev->cnf.max_desync_factor * HZ; 1890 if (time_before(expires, jiffies)) { 1891 pr_warn("%s: too short regeneration interval; timer disabled for %s\n", 1892 __func__, idev->dev->name); 1893 goto out; 1894 } 1895 1896 if (!mod_timer(&idev->regen_timer, expires)) 1897 in6_dev_hold(idev); 1898 1899 out: 1900 write_unlock_bh(&idev->lock); 1901 rcu_read_unlock_bh(); 1902 in6_dev_put(idev); 1903 } 1904 1905 static void __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) 1906 { 1907 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0) 1908 __ipv6_regen_rndid(idev); 1909 } 1910 #endif 1911 1912 /* 1913 * Add prefix route. 1914 */ 1915 1916 static void 1917 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev, 1918 unsigned long expires, u32 flags) 1919 { 1920 struct fib6_config cfg = { 1921 .fc_table = RT6_TABLE_PREFIX, 1922 .fc_metric = IP6_RT_PRIO_ADDRCONF, 1923 .fc_ifindex = dev->ifindex, 1924 .fc_expires = expires, 1925 .fc_dst_len = plen, 1926 .fc_flags = RTF_UP | flags, 1927 .fc_nlinfo.nl_net = dev_net(dev), 1928 .fc_protocol = RTPROT_KERNEL, 1929 }; 1930 1931 cfg.fc_dst = *pfx; 1932 1933 /* Prevent useless cloning on PtP SIT. 1934 This thing is done here expecting that the whole 1935 class of non-broadcast devices need not cloning. 1936 */ 1937 #if IS_ENABLED(CONFIG_IPV6_SIT) 1938 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT)) 1939 cfg.fc_flags |= RTF_NONEXTHOP; 1940 #endif 1941 1942 ip6_route_add(&cfg); 1943 } 1944 1945 1946 static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx, 1947 int plen, 1948 const struct net_device *dev, 1949 u32 flags, u32 noflags) 1950 { 1951 struct fib6_node *fn; 1952 struct rt6_info *rt = NULL; 1953 struct fib6_table *table; 1954 1955 table = fib6_get_table(dev_net(dev), RT6_TABLE_PREFIX); 1956 if (table == NULL) 1957 return NULL; 1958 1959 read_lock_bh(&table->tb6_lock); 1960 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0); 1961 if (!fn) 1962 goto out; 1963 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) { 1964 if (rt->dst.dev->ifindex != dev->ifindex) 1965 continue; 1966 if ((rt->rt6i_flags & flags) != flags) 1967 continue; 1968 if ((rt->rt6i_flags & noflags) != 0) 1969 continue; 1970 dst_hold(&rt->dst); 1971 break; 1972 } 1973 out: 1974 read_unlock_bh(&table->tb6_lock); 1975 return rt; 1976 } 1977 1978 1979 /* Create "default" multicast route to the interface */ 1980 1981 static void addrconf_add_mroute(struct net_device *dev) 1982 { 1983 struct fib6_config cfg = { 1984 .fc_table = RT6_TABLE_LOCAL, 1985 .fc_metric = IP6_RT_PRIO_ADDRCONF, 1986 .fc_ifindex = dev->ifindex, 1987 .fc_dst_len = 8, 1988 .fc_flags = RTF_UP, 1989 .fc_nlinfo.nl_net = dev_net(dev), 1990 }; 1991 1992 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0); 1993 1994 ip6_route_add(&cfg); 1995 } 1996 1997 #if IS_ENABLED(CONFIG_IPV6_SIT) 1998 static void sit_route_add(struct net_device *dev) 1999 { 2000 struct fib6_config cfg = { 2001 .fc_table = RT6_TABLE_MAIN, 2002 .fc_metric = IP6_RT_PRIO_ADDRCONF, 2003 .fc_ifindex = dev->ifindex, 2004 .fc_dst_len = 96, 2005 .fc_flags = RTF_UP | RTF_NONEXTHOP, 2006 .fc_nlinfo.nl_net = dev_net(dev), 2007 }; 2008 2009 /* prefix length - 96 bits "::d.d.d.d" */ 2010 ip6_route_add(&cfg); 2011 } 2012 #endif 2013 2014 static struct inet6_dev *addrconf_add_dev(struct net_device *dev) 2015 { 2016 struct inet6_dev *idev; 2017 2018 ASSERT_RTNL(); 2019 2020 idev = ipv6_find_idev(dev); 2021 if (!idev) 2022 return ERR_PTR(-ENOBUFS); 2023 2024 if (idev->cnf.disable_ipv6) 2025 return ERR_PTR(-EACCES); 2026 2027 /* Add default multicast route */ 2028 if (!(dev->flags & IFF_LOOPBACK)) 2029 addrconf_add_mroute(dev); 2030 2031 return idev; 2032 } 2033 2034 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao) 2035 { 2036 struct prefix_info *pinfo; 2037 __u32 valid_lft; 2038 __u32 prefered_lft; 2039 int addr_type; 2040 struct inet6_dev *in6_dev; 2041 struct net *net = dev_net(dev); 2042 2043 pinfo = (struct prefix_info *) opt; 2044 2045 if (len < sizeof(struct prefix_info)) { 2046 ADBG(("addrconf: prefix option too short\n")); 2047 return; 2048 } 2049 2050 /* 2051 * Validation checks ([ADDRCONF], page 19) 2052 */ 2053 2054 addr_type = ipv6_addr_type(&pinfo->prefix); 2055 2056 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL)) 2057 return; 2058 2059 valid_lft = ntohl(pinfo->valid); 2060 prefered_lft = ntohl(pinfo->prefered); 2061 2062 if (prefered_lft > valid_lft) { 2063 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n"); 2064 return; 2065 } 2066 2067 in6_dev = in6_dev_get(dev); 2068 2069 if (in6_dev == NULL) { 2070 net_dbg_ratelimited("addrconf: device %s not configured\n", 2071 dev->name); 2072 return; 2073 } 2074 2075 /* 2076 * Two things going on here: 2077 * 1) Add routes for on-link prefixes 2078 * 2) Configure prefixes with the auto flag set 2079 */ 2080 2081 if (pinfo->onlink) { 2082 struct rt6_info *rt; 2083 unsigned long rt_expires; 2084 2085 /* Avoid arithmetic overflow. Really, we could 2086 * save rt_expires in seconds, likely valid_lft, 2087 * but it would require division in fib gc, that it 2088 * not good. 2089 */ 2090 if (HZ > USER_HZ) 2091 rt_expires = addrconf_timeout_fixup(valid_lft, HZ); 2092 else 2093 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ); 2094 2095 if (addrconf_finite_timeout(rt_expires)) 2096 rt_expires *= HZ; 2097 2098 rt = addrconf_get_prefix_route(&pinfo->prefix, 2099 pinfo->prefix_len, 2100 dev, 2101 RTF_ADDRCONF | RTF_PREFIX_RT, 2102 RTF_GATEWAY | RTF_DEFAULT); 2103 2104 if (rt) { 2105 /* Autoconf prefix route */ 2106 if (valid_lft == 0) { 2107 ip6_del_rt(rt); 2108 rt = NULL; 2109 } else if (addrconf_finite_timeout(rt_expires)) { 2110 /* not infinity */ 2111 rt6_set_expires(rt, jiffies + rt_expires); 2112 } else { 2113 rt6_clean_expires(rt); 2114 } 2115 } else if (valid_lft) { 2116 clock_t expires = 0; 2117 int flags = RTF_ADDRCONF | RTF_PREFIX_RT; 2118 if (addrconf_finite_timeout(rt_expires)) { 2119 /* not infinity */ 2120 flags |= RTF_EXPIRES; 2121 expires = jiffies_to_clock_t(rt_expires); 2122 } 2123 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len, 2124 dev, expires, flags); 2125 } 2126 ip6_rt_put(rt); 2127 } 2128 2129 /* Try to figure out our local address for this prefix */ 2130 2131 if (pinfo->autoconf && in6_dev->cnf.autoconf) { 2132 struct inet6_ifaddr *ifp; 2133 struct in6_addr addr; 2134 int create = 0, update_lft = 0; 2135 bool tokenized = false; 2136 2137 if (pinfo->prefix_len == 64) { 2138 memcpy(&addr, &pinfo->prefix, 8); 2139 2140 if (!ipv6_addr_any(&in6_dev->token)) { 2141 read_lock_bh(&in6_dev->lock); 2142 memcpy(addr.s6_addr + 8, 2143 in6_dev->token.s6_addr + 8, 8); 2144 read_unlock_bh(&in6_dev->lock); 2145 tokenized = true; 2146 } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) && 2147 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) { 2148 in6_dev_put(in6_dev); 2149 return; 2150 } 2151 goto ok; 2152 } 2153 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n", 2154 pinfo->prefix_len); 2155 in6_dev_put(in6_dev); 2156 return; 2157 2158 ok: 2159 2160 ifp = ipv6_get_ifaddr(net, &addr, dev, 1); 2161 2162 if (ifp == NULL && valid_lft) { 2163 int max_addresses = in6_dev->cnf.max_addresses; 2164 u32 addr_flags = 0; 2165 2166 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 2167 if (in6_dev->cnf.optimistic_dad && 2168 !net->ipv6.devconf_all->forwarding && sllao) 2169 addr_flags = IFA_F_OPTIMISTIC; 2170 #endif 2171 2172 /* Do not allow to create too much of autoconfigured 2173 * addresses; this would be too easy way to crash kernel. 2174 */ 2175 if (!max_addresses || 2176 ipv6_count_addresses(in6_dev) < max_addresses) 2177 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len, 2178 addr_type&IPV6_ADDR_SCOPE_MASK, 2179 addr_flags); 2180 2181 if (IS_ERR_OR_NULL(ifp)) { 2182 in6_dev_put(in6_dev); 2183 return; 2184 } 2185 2186 update_lft = create = 1; 2187 ifp->cstamp = jiffies; 2188 ifp->tokenized = tokenized; 2189 addrconf_dad_start(ifp); 2190 } 2191 2192 if (ifp) { 2193 int flags; 2194 unsigned long now; 2195 #ifdef CONFIG_IPV6_PRIVACY 2196 struct inet6_ifaddr *ift; 2197 #endif 2198 u32 stored_lft; 2199 2200 /* update lifetime (RFC2462 5.5.3 e) */ 2201 spin_lock(&ifp->lock); 2202 now = jiffies; 2203 if (ifp->valid_lft > (now - ifp->tstamp) / HZ) 2204 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ; 2205 else 2206 stored_lft = 0; 2207 if (!update_lft && stored_lft) { 2208 if (valid_lft > MIN_VALID_LIFETIME || 2209 valid_lft > stored_lft) 2210 update_lft = 1; 2211 else if (stored_lft <= MIN_VALID_LIFETIME) { 2212 /* valid_lft <= stored_lft is always true */ 2213 /* 2214 * RFC 4862 Section 5.5.3e: 2215 * "Note that the preferred lifetime of 2216 * the corresponding address is always 2217 * reset to the Preferred Lifetime in 2218 * the received Prefix Information 2219 * option, regardless of whether the 2220 * valid lifetime is also reset or 2221 * ignored." 2222 * 2223 * So if the preferred lifetime in 2224 * this advertisement is different 2225 * than what we have stored, but the 2226 * valid lifetime is invalid, just 2227 * reset prefered_lft. 2228 * 2229 * We must set the valid lifetime 2230 * to the stored lifetime since we'll 2231 * be updating the timestamp below, 2232 * else we'll set it back to the 2233 * minimum. 2234 */ 2235 if (prefered_lft != ifp->prefered_lft) { 2236 valid_lft = stored_lft; 2237 update_lft = 1; 2238 } 2239 } else { 2240 valid_lft = MIN_VALID_LIFETIME; 2241 if (valid_lft < prefered_lft) 2242 prefered_lft = valid_lft; 2243 update_lft = 1; 2244 } 2245 } 2246 2247 if (update_lft) { 2248 ifp->valid_lft = valid_lft; 2249 ifp->prefered_lft = prefered_lft; 2250 ifp->tstamp = now; 2251 flags = ifp->flags; 2252 ifp->flags &= ~IFA_F_DEPRECATED; 2253 spin_unlock(&ifp->lock); 2254 2255 if (!(flags&IFA_F_TENTATIVE)) 2256 ipv6_ifa_notify(0, ifp); 2257 } else 2258 spin_unlock(&ifp->lock); 2259 2260 #ifdef CONFIG_IPV6_PRIVACY 2261 read_lock_bh(&in6_dev->lock); 2262 /* update all temporary addresses in the list */ 2263 list_for_each_entry(ift, &in6_dev->tempaddr_list, 2264 tmp_list) { 2265 int age, max_valid, max_prefered; 2266 2267 if (ifp != ift->ifpub) 2268 continue; 2269 2270 /* 2271 * RFC 4941 section 3.3: 2272 * If a received option will extend the lifetime 2273 * of a public address, the lifetimes of 2274 * temporary addresses should be extended, 2275 * subject to the overall constraint that no 2276 * temporary addresses should ever remain 2277 * "valid" or "preferred" for a time longer than 2278 * (TEMP_VALID_LIFETIME) or 2279 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), 2280 * respectively. 2281 */ 2282 age = (now - ift->cstamp) / HZ; 2283 max_valid = in6_dev->cnf.temp_valid_lft - age; 2284 if (max_valid < 0) 2285 max_valid = 0; 2286 2287 max_prefered = in6_dev->cnf.temp_prefered_lft - 2288 in6_dev->cnf.max_desync_factor - 2289 age; 2290 if (max_prefered < 0) 2291 max_prefered = 0; 2292 2293 if (valid_lft > max_valid) 2294 valid_lft = max_valid; 2295 2296 if (prefered_lft > max_prefered) 2297 prefered_lft = max_prefered; 2298 2299 spin_lock(&ift->lock); 2300 flags = ift->flags; 2301 ift->valid_lft = valid_lft; 2302 ift->prefered_lft = prefered_lft; 2303 ift->tstamp = now; 2304 if (prefered_lft > 0) 2305 ift->flags &= ~IFA_F_DEPRECATED; 2306 2307 spin_unlock(&ift->lock); 2308 if (!(flags&IFA_F_TENTATIVE)) 2309 ipv6_ifa_notify(0, ift); 2310 } 2311 2312 if ((create || list_empty(&in6_dev->tempaddr_list)) && in6_dev->cnf.use_tempaddr > 0) { 2313 /* 2314 * When a new public address is created as 2315 * described in [ADDRCONF], also create a new 2316 * temporary address. Also create a temporary 2317 * address if it's enabled but no temporary 2318 * address currently exists. 2319 */ 2320 read_unlock_bh(&in6_dev->lock); 2321 ipv6_create_tempaddr(ifp, NULL); 2322 } else { 2323 read_unlock_bh(&in6_dev->lock); 2324 } 2325 #endif 2326 in6_ifa_put(ifp); 2327 addrconf_verify(0); 2328 } 2329 } 2330 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo); 2331 in6_dev_put(in6_dev); 2332 } 2333 2334 /* 2335 * Set destination address. 2336 * Special case for SIT interfaces where we create a new "virtual" 2337 * device. 2338 */ 2339 int addrconf_set_dstaddr(struct net *net, void __user *arg) 2340 { 2341 struct in6_ifreq ireq; 2342 struct net_device *dev; 2343 int err = -EINVAL; 2344 2345 rtnl_lock(); 2346 2347 err = -EFAULT; 2348 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2349 goto err_exit; 2350 2351 dev = __dev_get_by_index(net, ireq.ifr6_ifindex); 2352 2353 err = -ENODEV; 2354 if (dev == NULL) 2355 goto err_exit; 2356 2357 #if IS_ENABLED(CONFIG_IPV6_SIT) 2358 if (dev->type == ARPHRD_SIT) { 2359 const struct net_device_ops *ops = dev->netdev_ops; 2360 struct ifreq ifr; 2361 struct ip_tunnel_parm p; 2362 2363 err = -EADDRNOTAVAIL; 2364 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4)) 2365 goto err_exit; 2366 2367 memset(&p, 0, sizeof(p)); 2368 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3]; 2369 p.iph.saddr = 0; 2370 p.iph.version = 4; 2371 p.iph.ihl = 5; 2372 p.iph.protocol = IPPROTO_IPV6; 2373 p.iph.ttl = 64; 2374 ifr.ifr_ifru.ifru_data = (__force void __user *)&p; 2375 2376 if (ops->ndo_do_ioctl) { 2377 mm_segment_t oldfs = get_fs(); 2378 2379 set_fs(KERNEL_DS); 2380 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL); 2381 set_fs(oldfs); 2382 } else 2383 err = -EOPNOTSUPP; 2384 2385 if (err == 0) { 2386 err = -ENOBUFS; 2387 dev = __dev_get_by_name(net, p.name); 2388 if (!dev) 2389 goto err_exit; 2390 err = dev_open(dev); 2391 } 2392 } 2393 #endif 2394 2395 err_exit: 2396 rtnl_unlock(); 2397 return err; 2398 } 2399 2400 /* 2401 * Manual configuration of address on an interface 2402 */ 2403 static int inet6_addr_add(struct net *net, int ifindex, const struct in6_addr *pfx, 2404 const struct in6_addr *peer_pfx, 2405 unsigned int plen, __u8 ifa_flags, __u32 prefered_lft, 2406 __u32 valid_lft) 2407 { 2408 struct inet6_ifaddr *ifp; 2409 struct inet6_dev *idev; 2410 struct net_device *dev; 2411 int scope; 2412 u32 flags; 2413 clock_t expires; 2414 unsigned long timeout; 2415 2416 ASSERT_RTNL(); 2417 2418 if (plen > 128) 2419 return -EINVAL; 2420 2421 /* check the lifetime */ 2422 if (!valid_lft || prefered_lft > valid_lft) 2423 return -EINVAL; 2424 2425 dev = __dev_get_by_index(net, ifindex); 2426 if (!dev) 2427 return -ENODEV; 2428 2429 idev = addrconf_add_dev(dev); 2430 if (IS_ERR(idev)) 2431 return PTR_ERR(idev); 2432 2433 scope = ipv6_addr_scope(pfx); 2434 2435 timeout = addrconf_timeout_fixup(valid_lft, HZ); 2436 if (addrconf_finite_timeout(timeout)) { 2437 expires = jiffies_to_clock_t(timeout * HZ); 2438 valid_lft = timeout; 2439 flags = RTF_EXPIRES; 2440 } else { 2441 expires = 0; 2442 flags = 0; 2443 ifa_flags |= IFA_F_PERMANENT; 2444 } 2445 2446 timeout = addrconf_timeout_fixup(prefered_lft, HZ); 2447 if (addrconf_finite_timeout(timeout)) { 2448 if (timeout == 0) 2449 ifa_flags |= IFA_F_DEPRECATED; 2450 prefered_lft = timeout; 2451 } 2452 2453 ifp = ipv6_add_addr(idev, pfx, plen, scope, ifa_flags); 2454 2455 if (!IS_ERR(ifp)) { 2456 spin_lock_bh(&ifp->lock); 2457 ifp->valid_lft = valid_lft; 2458 ifp->prefered_lft = prefered_lft; 2459 ifp->tstamp = jiffies; 2460 if (peer_pfx) 2461 ifp->peer_addr = *peer_pfx; 2462 spin_unlock_bh(&ifp->lock); 2463 2464 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev, 2465 expires, flags); 2466 /* 2467 * Note that section 3.1 of RFC 4429 indicates 2468 * that the Optimistic flag should not be set for 2469 * manually configured addresses 2470 */ 2471 addrconf_dad_start(ifp); 2472 in6_ifa_put(ifp); 2473 addrconf_verify(0); 2474 return 0; 2475 } 2476 2477 return PTR_ERR(ifp); 2478 } 2479 2480 static int inet6_addr_del(struct net *net, int ifindex, const struct in6_addr *pfx, 2481 unsigned int plen) 2482 { 2483 struct inet6_ifaddr *ifp; 2484 struct inet6_dev *idev; 2485 struct net_device *dev; 2486 2487 if (plen > 128) 2488 return -EINVAL; 2489 2490 dev = __dev_get_by_index(net, ifindex); 2491 if (!dev) 2492 return -ENODEV; 2493 2494 if ((idev = __in6_dev_get(dev)) == NULL) 2495 return -ENXIO; 2496 2497 read_lock_bh(&idev->lock); 2498 list_for_each_entry(ifp, &idev->addr_list, if_list) { 2499 if (ifp->prefix_len == plen && 2500 ipv6_addr_equal(pfx, &ifp->addr)) { 2501 in6_ifa_hold(ifp); 2502 read_unlock_bh(&idev->lock); 2503 2504 ipv6_del_addr(ifp); 2505 2506 /* If the last address is deleted administratively, 2507 disable IPv6 on this interface. 2508 */ 2509 if (list_empty(&idev->addr_list)) 2510 addrconf_ifdown(idev->dev, 1); 2511 return 0; 2512 } 2513 } 2514 read_unlock_bh(&idev->lock); 2515 return -EADDRNOTAVAIL; 2516 } 2517 2518 2519 int addrconf_add_ifaddr(struct net *net, void __user *arg) 2520 { 2521 struct in6_ifreq ireq; 2522 int err; 2523 2524 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 2525 return -EPERM; 2526 2527 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2528 return -EFAULT; 2529 2530 rtnl_lock(); 2531 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, NULL, 2532 ireq.ifr6_prefixlen, IFA_F_PERMANENT, 2533 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME); 2534 rtnl_unlock(); 2535 return err; 2536 } 2537 2538 int addrconf_del_ifaddr(struct net *net, void __user *arg) 2539 { 2540 struct in6_ifreq ireq; 2541 int err; 2542 2543 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 2544 return -EPERM; 2545 2546 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2547 return -EFAULT; 2548 2549 rtnl_lock(); 2550 err = inet6_addr_del(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, 2551 ireq.ifr6_prefixlen); 2552 rtnl_unlock(); 2553 return err; 2554 } 2555 2556 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr, 2557 int plen, int scope) 2558 { 2559 struct inet6_ifaddr *ifp; 2560 2561 ifp = ipv6_add_addr(idev, addr, plen, scope, IFA_F_PERMANENT); 2562 if (!IS_ERR(ifp)) { 2563 spin_lock_bh(&ifp->lock); 2564 ifp->flags &= ~IFA_F_TENTATIVE; 2565 spin_unlock_bh(&ifp->lock); 2566 ipv6_ifa_notify(RTM_NEWADDR, ifp); 2567 in6_ifa_put(ifp); 2568 } 2569 } 2570 2571 #if IS_ENABLED(CONFIG_IPV6_SIT) 2572 static void sit_add_v4_addrs(struct inet6_dev *idev) 2573 { 2574 struct in6_addr addr; 2575 struct net_device *dev; 2576 struct net *net = dev_net(idev->dev); 2577 int scope; 2578 2579 ASSERT_RTNL(); 2580 2581 memset(&addr, 0, sizeof(struct in6_addr)); 2582 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4); 2583 2584 if (idev->dev->flags&IFF_POINTOPOINT) { 2585 addr.s6_addr32[0] = htonl(0xfe800000); 2586 scope = IFA_LINK; 2587 } else { 2588 scope = IPV6_ADDR_COMPATv4; 2589 } 2590 2591 if (addr.s6_addr32[3]) { 2592 add_addr(idev, &addr, 128, scope); 2593 return; 2594 } 2595 2596 for_each_netdev(net, dev) { 2597 struct in_device *in_dev = __in_dev_get_rtnl(dev); 2598 if (in_dev && (dev->flags & IFF_UP)) { 2599 struct in_ifaddr *ifa; 2600 2601 int flag = scope; 2602 2603 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) { 2604 int plen; 2605 2606 addr.s6_addr32[3] = ifa->ifa_local; 2607 2608 if (ifa->ifa_scope == RT_SCOPE_LINK) 2609 continue; 2610 if (ifa->ifa_scope >= RT_SCOPE_HOST) { 2611 if (idev->dev->flags&IFF_POINTOPOINT) 2612 continue; 2613 flag |= IFA_HOST; 2614 } 2615 if (idev->dev->flags&IFF_POINTOPOINT) 2616 plen = 64; 2617 else 2618 plen = 96; 2619 2620 add_addr(idev, &addr, plen, flag); 2621 } 2622 } 2623 } 2624 } 2625 #endif 2626 2627 static void init_loopback(struct net_device *dev) 2628 { 2629 struct inet6_dev *idev; 2630 struct net_device *sp_dev; 2631 struct inet6_ifaddr *sp_ifa; 2632 struct rt6_info *sp_rt; 2633 2634 /* ::1 */ 2635 2636 ASSERT_RTNL(); 2637 2638 if ((idev = ipv6_find_idev(dev)) == NULL) { 2639 pr_debug("%s: add_dev failed\n", __func__); 2640 return; 2641 } 2642 2643 add_addr(idev, &in6addr_loopback, 128, IFA_HOST); 2644 2645 /* Add routes to other interface's IPv6 addresses */ 2646 for_each_netdev(dev_net(dev), sp_dev) { 2647 if (!strcmp(sp_dev->name, dev->name)) 2648 continue; 2649 2650 idev = __in6_dev_get(sp_dev); 2651 if (!idev) 2652 continue; 2653 2654 read_lock_bh(&idev->lock); 2655 list_for_each_entry(sp_ifa, &idev->addr_list, if_list) { 2656 2657 if (sp_ifa->flags & (IFA_F_DADFAILED | IFA_F_TENTATIVE)) 2658 continue; 2659 2660 sp_rt = addrconf_dst_alloc(idev, &sp_ifa->addr, 0); 2661 2662 /* Failure cases are ignored */ 2663 if (!IS_ERR(sp_rt)) { 2664 sp_ifa->rt = sp_rt; 2665 ip6_ins_rt(sp_rt); 2666 } 2667 } 2668 read_unlock_bh(&idev->lock); 2669 } 2670 } 2671 2672 static void addrconf_add_linklocal(struct inet6_dev *idev, const struct in6_addr *addr) 2673 { 2674 struct inet6_ifaddr *ifp; 2675 u32 addr_flags = IFA_F_PERMANENT; 2676 2677 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 2678 if (idev->cnf.optimistic_dad && 2679 !dev_net(idev->dev)->ipv6.devconf_all->forwarding) 2680 addr_flags |= IFA_F_OPTIMISTIC; 2681 #endif 2682 2683 2684 ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, addr_flags); 2685 if (!IS_ERR(ifp)) { 2686 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0); 2687 addrconf_dad_start(ifp); 2688 in6_ifa_put(ifp); 2689 } 2690 } 2691 2692 static void addrconf_dev_config(struct net_device *dev) 2693 { 2694 struct in6_addr addr; 2695 struct inet6_dev *idev; 2696 2697 ASSERT_RTNL(); 2698 2699 if ((dev->type != ARPHRD_ETHER) && 2700 (dev->type != ARPHRD_FDDI) && 2701 (dev->type != ARPHRD_ARCNET) && 2702 (dev->type != ARPHRD_INFINIBAND) && 2703 (dev->type != ARPHRD_IEEE802154) && 2704 (dev->type != ARPHRD_IEEE1394)) { 2705 /* Alas, we support only Ethernet autoconfiguration. */ 2706 return; 2707 } 2708 2709 idev = addrconf_add_dev(dev); 2710 if (IS_ERR(idev)) 2711 return; 2712 2713 memset(&addr, 0, sizeof(struct in6_addr)); 2714 addr.s6_addr32[0] = htonl(0xFE800000); 2715 2716 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0) 2717 addrconf_add_linklocal(idev, &addr); 2718 } 2719 2720 #if IS_ENABLED(CONFIG_IPV6_SIT) 2721 static void addrconf_sit_config(struct net_device *dev) 2722 { 2723 struct inet6_dev *idev; 2724 2725 ASSERT_RTNL(); 2726 2727 /* 2728 * Configure the tunnel with one of our IPv4 2729 * addresses... we should configure all of 2730 * our v4 addrs in the tunnel 2731 */ 2732 2733 if ((idev = ipv6_find_idev(dev)) == NULL) { 2734 pr_debug("%s: add_dev failed\n", __func__); 2735 return; 2736 } 2737 2738 if (dev->priv_flags & IFF_ISATAP) { 2739 struct in6_addr addr; 2740 2741 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0); 2742 addrconf_prefix_route(&addr, 64, dev, 0, 0); 2743 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev)) 2744 addrconf_add_linklocal(idev, &addr); 2745 return; 2746 } 2747 2748 sit_add_v4_addrs(idev); 2749 2750 if (dev->flags&IFF_POINTOPOINT) 2751 addrconf_add_mroute(dev); 2752 else 2753 sit_route_add(dev); 2754 } 2755 #endif 2756 2757 #if IS_ENABLED(CONFIG_NET_IPGRE) 2758 static void addrconf_gre_config(struct net_device *dev) 2759 { 2760 struct inet6_dev *idev; 2761 struct in6_addr addr; 2762 2763 pr_info("%s(%s)\n", __func__, dev->name); 2764 2765 ASSERT_RTNL(); 2766 2767 if ((idev = ipv6_find_idev(dev)) == NULL) { 2768 pr_debug("%s: add_dev failed\n", __func__); 2769 return; 2770 } 2771 2772 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0); 2773 addrconf_prefix_route(&addr, 64, dev, 0, 0); 2774 2775 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev)) 2776 addrconf_add_linklocal(idev, &addr); 2777 } 2778 #endif 2779 2780 static inline int 2781 ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev) 2782 { 2783 struct in6_addr lladdr; 2784 2785 if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) { 2786 addrconf_add_linklocal(idev, &lladdr); 2787 return 0; 2788 } 2789 return -1; 2790 } 2791 2792 static void ip6_tnl_add_linklocal(struct inet6_dev *idev) 2793 { 2794 struct net_device *link_dev; 2795 struct net *net = dev_net(idev->dev); 2796 2797 /* first try to inherit the link-local address from the link device */ 2798 if (idev->dev->iflink && 2799 (link_dev = __dev_get_by_index(net, idev->dev->iflink))) { 2800 if (!ipv6_inherit_linklocal(idev, link_dev)) 2801 return; 2802 } 2803 /* then try to inherit it from any device */ 2804 for_each_netdev(net, link_dev) { 2805 if (!ipv6_inherit_linklocal(idev, link_dev)) 2806 return; 2807 } 2808 pr_debug("init ip6-ip6: add_linklocal failed\n"); 2809 } 2810 2811 /* 2812 * Autoconfigure tunnel with a link-local address so routing protocols, 2813 * DHCPv6, MLD etc. can be run over the virtual link 2814 */ 2815 2816 static void addrconf_ip6_tnl_config(struct net_device *dev) 2817 { 2818 struct inet6_dev *idev; 2819 2820 ASSERT_RTNL(); 2821 2822 idev = addrconf_add_dev(dev); 2823 if (IS_ERR(idev)) { 2824 pr_debug("init ip6-ip6: add_dev failed\n"); 2825 return; 2826 } 2827 ip6_tnl_add_linklocal(idev); 2828 } 2829 2830 static int addrconf_notify(struct notifier_block *this, unsigned long event, 2831 void *ptr) 2832 { 2833 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 2834 struct inet6_dev *idev = __in6_dev_get(dev); 2835 int run_pending = 0; 2836 int err; 2837 2838 switch (event) { 2839 case NETDEV_REGISTER: 2840 if (!idev && dev->mtu >= IPV6_MIN_MTU) { 2841 idev = ipv6_add_dev(dev); 2842 if (!idev) 2843 return notifier_from_errno(-ENOMEM); 2844 } 2845 break; 2846 2847 case NETDEV_UP: 2848 case NETDEV_CHANGE: 2849 if (dev->flags & IFF_SLAVE) 2850 break; 2851 2852 if (event == NETDEV_UP) { 2853 if (!addrconf_qdisc_ok(dev)) { 2854 /* device is not ready yet. */ 2855 pr_info("ADDRCONF(NETDEV_UP): %s: link is not ready\n", 2856 dev->name); 2857 break; 2858 } 2859 2860 if (!idev && dev->mtu >= IPV6_MIN_MTU) 2861 idev = ipv6_add_dev(dev); 2862 2863 if (idev) { 2864 idev->if_flags |= IF_READY; 2865 run_pending = 1; 2866 } 2867 } else { 2868 if (!addrconf_qdisc_ok(dev)) { 2869 /* device is still not ready. */ 2870 break; 2871 } 2872 2873 if (idev) { 2874 if (idev->if_flags & IF_READY) 2875 /* device is already configured. */ 2876 break; 2877 idev->if_flags |= IF_READY; 2878 } 2879 2880 pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n", 2881 dev->name); 2882 2883 run_pending = 1; 2884 } 2885 2886 switch (dev->type) { 2887 #if IS_ENABLED(CONFIG_IPV6_SIT) 2888 case ARPHRD_SIT: 2889 addrconf_sit_config(dev); 2890 break; 2891 #endif 2892 #if IS_ENABLED(CONFIG_NET_IPGRE) 2893 case ARPHRD_IPGRE: 2894 addrconf_gre_config(dev); 2895 break; 2896 #endif 2897 case ARPHRD_TUNNEL6: 2898 addrconf_ip6_tnl_config(dev); 2899 break; 2900 case ARPHRD_LOOPBACK: 2901 init_loopback(dev); 2902 break; 2903 2904 default: 2905 addrconf_dev_config(dev); 2906 break; 2907 } 2908 2909 if (idev) { 2910 if (run_pending) 2911 addrconf_dad_run(idev); 2912 2913 /* 2914 * If the MTU changed during the interface down, 2915 * when the interface up, the changed MTU must be 2916 * reflected in the idev as well as routers. 2917 */ 2918 if (idev->cnf.mtu6 != dev->mtu && 2919 dev->mtu >= IPV6_MIN_MTU) { 2920 rt6_mtu_change(dev, dev->mtu); 2921 idev->cnf.mtu6 = dev->mtu; 2922 } 2923 idev->tstamp = jiffies; 2924 inet6_ifinfo_notify(RTM_NEWLINK, idev); 2925 2926 /* 2927 * If the changed mtu during down is lower than 2928 * IPV6_MIN_MTU stop IPv6 on this interface. 2929 */ 2930 if (dev->mtu < IPV6_MIN_MTU) 2931 addrconf_ifdown(dev, 1); 2932 } 2933 break; 2934 2935 case NETDEV_CHANGEMTU: 2936 if (idev && dev->mtu >= IPV6_MIN_MTU) { 2937 rt6_mtu_change(dev, dev->mtu); 2938 idev->cnf.mtu6 = dev->mtu; 2939 break; 2940 } 2941 2942 if (!idev && dev->mtu >= IPV6_MIN_MTU) { 2943 idev = ipv6_add_dev(dev); 2944 if (idev) 2945 break; 2946 } 2947 2948 /* 2949 * MTU falled under IPV6_MIN_MTU. 2950 * Stop IPv6 on this interface. 2951 */ 2952 2953 case NETDEV_DOWN: 2954 case NETDEV_UNREGISTER: 2955 /* 2956 * Remove all addresses from this interface. 2957 */ 2958 addrconf_ifdown(dev, event != NETDEV_DOWN); 2959 break; 2960 2961 case NETDEV_CHANGENAME: 2962 if (idev) { 2963 snmp6_unregister_dev(idev); 2964 addrconf_sysctl_unregister(idev); 2965 addrconf_sysctl_register(idev); 2966 err = snmp6_register_dev(idev); 2967 if (err) 2968 return notifier_from_errno(err); 2969 } 2970 break; 2971 2972 case NETDEV_PRE_TYPE_CHANGE: 2973 case NETDEV_POST_TYPE_CHANGE: 2974 addrconf_type_change(dev, event); 2975 break; 2976 } 2977 2978 return NOTIFY_OK; 2979 } 2980 2981 /* 2982 * addrconf module should be notified of a device going up 2983 */ 2984 static struct notifier_block ipv6_dev_notf = { 2985 .notifier_call = addrconf_notify, 2986 }; 2987 2988 static void addrconf_type_change(struct net_device *dev, unsigned long event) 2989 { 2990 struct inet6_dev *idev; 2991 ASSERT_RTNL(); 2992 2993 idev = __in6_dev_get(dev); 2994 2995 if (event == NETDEV_POST_TYPE_CHANGE) 2996 ipv6_mc_remap(idev); 2997 else if (event == NETDEV_PRE_TYPE_CHANGE) 2998 ipv6_mc_unmap(idev); 2999 } 3000 3001 static int addrconf_ifdown(struct net_device *dev, int how) 3002 { 3003 struct net *net = dev_net(dev); 3004 struct inet6_dev *idev; 3005 struct inet6_ifaddr *ifa; 3006 int state, i; 3007 3008 ASSERT_RTNL(); 3009 3010 rt6_ifdown(net, dev); 3011 neigh_ifdown(&nd_tbl, dev); 3012 3013 idev = __in6_dev_get(dev); 3014 if (idev == NULL) 3015 return -ENODEV; 3016 3017 /* 3018 * Step 1: remove reference to ipv6 device from parent device. 3019 * Do not dev_put! 3020 */ 3021 if (how) { 3022 idev->dead = 1; 3023 3024 /* protected by rtnl_lock */ 3025 RCU_INIT_POINTER(dev->ip6_ptr, NULL); 3026 3027 /* Step 1.5: remove snmp6 entry */ 3028 snmp6_unregister_dev(idev); 3029 3030 } 3031 3032 /* Step 2: clear hash table */ 3033 for (i = 0; i < IN6_ADDR_HSIZE; i++) { 3034 struct hlist_head *h = &inet6_addr_lst[i]; 3035 3036 spin_lock_bh(&addrconf_hash_lock); 3037 restart: 3038 hlist_for_each_entry_rcu(ifa, h, addr_lst) { 3039 if (ifa->idev == idev) { 3040 hlist_del_init_rcu(&ifa->addr_lst); 3041 addrconf_del_timer(ifa); 3042 goto restart; 3043 } 3044 } 3045 spin_unlock_bh(&addrconf_hash_lock); 3046 } 3047 3048 write_lock_bh(&idev->lock); 3049 3050 /* Step 2: clear flags for stateless addrconf */ 3051 if (!how) 3052 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY); 3053 3054 #ifdef CONFIG_IPV6_PRIVACY 3055 if (how && del_timer(&idev->regen_timer)) 3056 in6_dev_put(idev); 3057 3058 /* Step 3: clear tempaddr list */ 3059 while (!list_empty(&idev->tempaddr_list)) { 3060 ifa = list_first_entry(&idev->tempaddr_list, 3061 struct inet6_ifaddr, tmp_list); 3062 list_del(&ifa->tmp_list); 3063 write_unlock_bh(&idev->lock); 3064 spin_lock_bh(&ifa->lock); 3065 3066 if (ifa->ifpub) { 3067 in6_ifa_put(ifa->ifpub); 3068 ifa->ifpub = NULL; 3069 } 3070 spin_unlock_bh(&ifa->lock); 3071 in6_ifa_put(ifa); 3072 write_lock_bh(&idev->lock); 3073 } 3074 #endif 3075 3076 while (!list_empty(&idev->addr_list)) { 3077 ifa = list_first_entry(&idev->addr_list, 3078 struct inet6_ifaddr, if_list); 3079 addrconf_del_timer(ifa); 3080 3081 list_del(&ifa->if_list); 3082 3083 write_unlock_bh(&idev->lock); 3084 3085 spin_lock_bh(&ifa->state_lock); 3086 state = ifa->state; 3087 ifa->state = INET6_IFADDR_STATE_DEAD; 3088 spin_unlock_bh(&ifa->state_lock); 3089 3090 if (state != INET6_IFADDR_STATE_DEAD) { 3091 __ipv6_ifa_notify(RTM_DELADDR, ifa); 3092 inet6addr_notifier_call_chain(NETDEV_DOWN, ifa); 3093 } 3094 in6_ifa_put(ifa); 3095 3096 write_lock_bh(&idev->lock); 3097 } 3098 3099 write_unlock_bh(&idev->lock); 3100 3101 /* Step 5: Discard multicast list */ 3102 if (how) 3103 ipv6_mc_destroy_dev(idev); 3104 else 3105 ipv6_mc_down(idev); 3106 3107 idev->tstamp = jiffies; 3108 3109 /* Last: Shot the device (if unregistered) */ 3110 if (how) { 3111 addrconf_sysctl_unregister(idev); 3112 neigh_parms_release(&nd_tbl, idev->nd_parms); 3113 neigh_ifdown(&nd_tbl, dev); 3114 in6_dev_put(idev); 3115 } 3116 return 0; 3117 } 3118 3119 static void addrconf_rs_timer(unsigned long data) 3120 { 3121 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data; 3122 struct inet6_dev *idev = ifp->idev; 3123 3124 read_lock(&idev->lock); 3125 if (idev->dead || !(idev->if_flags & IF_READY)) 3126 goto out; 3127 3128 if (!ipv6_accept_ra(idev)) 3129 goto out; 3130 3131 /* Announcement received after solicitation was sent */ 3132 if (idev->if_flags & IF_RA_RCVD) 3133 goto out; 3134 3135 spin_lock(&ifp->lock); 3136 if (ifp->probes++ < idev->cnf.rtr_solicits) { 3137 /* The wait after the last probe can be shorter */ 3138 addrconf_mod_timer(ifp, AC_RS, 3139 (ifp->probes == idev->cnf.rtr_solicits) ? 3140 idev->cnf.rtr_solicit_delay : 3141 idev->cnf.rtr_solicit_interval); 3142 spin_unlock(&ifp->lock); 3143 3144 ndisc_send_rs(idev->dev, &ifp->addr, &in6addr_linklocal_allrouters); 3145 } else { 3146 spin_unlock(&ifp->lock); 3147 /* 3148 * Note: we do not support deprecated "all on-link" 3149 * assumption any longer. 3150 */ 3151 pr_debug("%s: no IPv6 routers present\n", idev->dev->name); 3152 } 3153 3154 out: 3155 read_unlock(&idev->lock); 3156 in6_ifa_put(ifp); 3157 } 3158 3159 /* 3160 * Duplicate Address Detection 3161 */ 3162 static void addrconf_dad_kick(struct inet6_ifaddr *ifp) 3163 { 3164 unsigned long rand_num; 3165 struct inet6_dev *idev = ifp->idev; 3166 3167 if (ifp->flags & IFA_F_OPTIMISTIC) 3168 rand_num = 0; 3169 else 3170 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1); 3171 3172 ifp->probes = idev->cnf.dad_transmits; 3173 addrconf_mod_timer(ifp, AC_DAD, rand_num); 3174 } 3175 3176 static void addrconf_dad_start(struct inet6_ifaddr *ifp) 3177 { 3178 struct inet6_dev *idev = ifp->idev; 3179 struct net_device *dev = idev->dev; 3180 3181 addrconf_join_solict(dev, &ifp->addr); 3182 3183 net_srandom(ifp->addr.s6_addr32[3]); 3184 3185 read_lock_bh(&idev->lock); 3186 spin_lock(&ifp->lock); 3187 if (ifp->state == INET6_IFADDR_STATE_DEAD) 3188 goto out; 3189 3190 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) || 3191 idev->cnf.accept_dad < 1 || 3192 !(ifp->flags&IFA_F_TENTATIVE) || 3193 ifp->flags & IFA_F_NODAD) { 3194 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED); 3195 spin_unlock(&ifp->lock); 3196 read_unlock_bh(&idev->lock); 3197 3198 addrconf_dad_completed(ifp); 3199 return; 3200 } 3201 3202 if (!(idev->if_flags & IF_READY)) { 3203 spin_unlock(&ifp->lock); 3204 read_unlock_bh(&idev->lock); 3205 /* 3206 * If the device is not ready: 3207 * - keep it tentative if it is a permanent address. 3208 * - otherwise, kill it. 3209 */ 3210 in6_ifa_hold(ifp); 3211 addrconf_dad_stop(ifp, 0); 3212 return; 3213 } 3214 3215 /* 3216 * Optimistic nodes can start receiving 3217 * Frames right away 3218 */ 3219 if (ifp->flags & IFA_F_OPTIMISTIC) 3220 ip6_ins_rt(ifp->rt); 3221 3222 addrconf_dad_kick(ifp); 3223 out: 3224 spin_unlock(&ifp->lock); 3225 read_unlock_bh(&idev->lock); 3226 } 3227 3228 static void addrconf_dad_timer(unsigned long data) 3229 { 3230 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data; 3231 struct inet6_dev *idev = ifp->idev; 3232 struct in6_addr mcaddr; 3233 3234 if (!ifp->probes && addrconf_dad_end(ifp)) 3235 goto out; 3236 3237 read_lock(&idev->lock); 3238 if (idev->dead || !(idev->if_flags & IF_READY)) { 3239 read_unlock(&idev->lock); 3240 goto out; 3241 } 3242 3243 spin_lock(&ifp->lock); 3244 if (ifp->state == INET6_IFADDR_STATE_DEAD) { 3245 spin_unlock(&ifp->lock); 3246 read_unlock(&idev->lock); 3247 goto out; 3248 } 3249 3250 if (ifp->probes == 0) { 3251 /* 3252 * DAD was successful 3253 */ 3254 3255 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED); 3256 spin_unlock(&ifp->lock); 3257 read_unlock(&idev->lock); 3258 3259 addrconf_dad_completed(ifp); 3260 3261 goto out; 3262 } 3263 3264 ifp->probes--; 3265 addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time); 3266 spin_unlock(&ifp->lock); 3267 read_unlock(&idev->lock); 3268 3269 /* send a neighbour solicitation for our addr */ 3270 addrconf_addr_solict_mult(&ifp->addr, &mcaddr); 3271 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &in6addr_any); 3272 out: 3273 in6_ifa_put(ifp); 3274 } 3275 3276 static void addrconf_dad_completed(struct inet6_ifaddr *ifp) 3277 { 3278 struct net_device *dev = ifp->idev->dev; 3279 3280 /* 3281 * Configure the address for reception. Now it is valid. 3282 */ 3283 3284 ipv6_ifa_notify(RTM_NEWADDR, ifp); 3285 3286 /* If added prefix is link local and we are prepared to process 3287 router advertisements, start sending router solicitations. 3288 */ 3289 3290 if (ipv6_accept_ra(ifp->idev) && 3291 ifp->idev->cnf.rtr_solicits > 0 && 3292 (dev->flags&IFF_LOOPBACK) == 0 && 3293 (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) { 3294 /* 3295 * If a host as already performed a random delay 3296 * [...] as part of DAD [...] there is no need 3297 * to delay again before sending the first RS 3298 */ 3299 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &in6addr_linklocal_allrouters); 3300 3301 spin_lock_bh(&ifp->lock); 3302 ifp->probes = 1; 3303 ifp->idev->if_flags |= IF_RS_SENT; 3304 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval); 3305 spin_unlock_bh(&ifp->lock); 3306 } 3307 } 3308 3309 static void addrconf_dad_run(struct inet6_dev *idev) 3310 { 3311 struct inet6_ifaddr *ifp; 3312 3313 read_lock_bh(&idev->lock); 3314 list_for_each_entry(ifp, &idev->addr_list, if_list) { 3315 spin_lock(&ifp->lock); 3316 if (ifp->flags & IFA_F_TENTATIVE && 3317 ifp->state == INET6_IFADDR_STATE_DAD) 3318 addrconf_dad_kick(ifp); 3319 spin_unlock(&ifp->lock); 3320 } 3321 read_unlock_bh(&idev->lock); 3322 } 3323 3324 #ifdef CONFIG_PROC_FS 3325 struct if6_iter_state { 3326 struct seq_net_private p; 3327 int bucket; 3328 int offset; 3329 }; 3330 3331 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos) 3332 { 3333 struct inet6_ifaddr *ifa = NULL; 3334 struct if6_iter_state *state = seq->private; 3335 struct net *net = seq_file_net(seq); 3336 int p = 0; 3337 3338 /* initial bucket if pos is 0 */ 3339 if (pos == 0) { 3340 state->bucket = 0; 3341 state->offset = 0; 3342 } 3343 3344 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) { 3345 hlist_for_each_entry_rcu_bh(ifa, &inet6_addr_lst[state->bucket], 3346 addr_lst) { 3347 if (!net_eq(dev_net(ifa->idev->dev), net)) 3348 continue; 3349 /* sync with offset */ 3350 if (p < state->offset) { 3351 p++; 3352 continue; 3353 } 3354 state->offset++; 3355 return ifa; 3356 } 3357 3358 /* prepare for next bucket */ 3359 state->offset = 0; 3360 p = 0; 3361 } 3362 return NULL; 3363 } 3364 3365 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, 3366 struct inet6_ifaddr *ifa) 3367 { 3368 struct if6_iter_state *state = seq->private; 3369 struct net *net = seq_file_net(seq); 3370 3371 hlist_for_each_entry_continue_rcu_bh(ifa, addr_lst) { 3372 if (!net_eq(dev_net(ifa->idev->dev), net)) 3373 continue; 3374 state->offset++; 3375 return ifa; 3376 } 3377 3378 while (++state->bucket < IN6_ADDR_HSIZE) { 3379 state->offset = 0; 3380 hlist_for_each_entry_rcu_bh(ifa, 3381 &inet6_addr_lst[state->bucket], addr_lst) { 3382 if (!net_eq(dev_net(ifa->idev->dev), net)) 3383 continue; 3384 state->offset++; 3385 return ifa; 3386 } 3387 } 3388 3389 return NULL; 3390 } 3391 3392 static void *if6_seq_start(struct seq_file *seq, loff_t *pos) 3393 __acquires(rcu_bh) 3394 { 3395 rcu_read_lock_bh(); 3396 return if6_get_first(seq, *pos); 3397 } 3398 3399 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos) 3400 { 3401 struct inet6_ifaddr *ifa; 3402 3403 ifa = if6_get_next(seq, v); 3404 ++*pos; 3405 return ifa; 3406 } 3407 3408 static void if6_seq_stop(struct seq_file *seq, void *v) 3409 __releases(rcu_bh) 3410 { 3411 rcu_read_unlock_bh(); 3412 } 3413 3414 static int if6_seq_show(struct seq_file *seq, void *v) 3415 { 3416 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v; 3417 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n", 3418 &ifp->addr, 3419 ifp->idev->dev->ifindex, 3420 ifp->prefix_len, 3421 ifp->scope, 3422 ifp->flags, 3423 ifp->idev->dev->name); 3424 return 0; 3425 } 3426 3427 static const struct seq_operations if6_seq_ops = { 3428 .start = if6_seq_start, 3429 .next = if6_seq_next, 3430 .show = if6_seq_show, 3431 .stop = if6_seq_stop, 3432 }; 3433 3434 static int if6_seq_open(struct inode *inode, struct file *file) 3435 { 3436 return seq_open_net(inode, file, &if6_seq_ops, 3437 sizeof(struct if6_iter_state)); 3438 } 3439 3440 static const struct file_operations if6_fops = { 3441 .owner = THIS_MODULE, 3442 .open = if6_seq_open, 3443 .read = seq_read, 3444 .llseek = seq_lseek, 3445 .release = seq_release_net, 3446 }; 3447 3448 static int __net_init if6_proc_net_init(struct net *net) 3449 { 3450 if (!proc_create("if_inet6", S_IRUGO, net->proc_net, &if6_fops)) 3451 return -ENOMEM; 3452 return 0; 3453 } 3454 3455 static void __net_exit if6_proc_net_exit(struct net *net) 3456 { 3457 remove_proc_entry("if_inet6", net->proc_net); 3458 } 3459 3460 static struct pernet_operations if6_proc_net_ops = { 3461 .init = if6_proc_net_init, 3462 .exit = if6_proc_net_exit, 3463 }; 3464 3465 int __init if6_proc_init(void) 3466 { 3467 return register_pernet_subsys(&if6_proc_net_ops); 3468 } 3469 3470 void if6_proc_exit(void) 3471 { 3472 unregister_pernet_subsys(&if6_proc_net_ops); 3473 } 3474 #endif /* CONFIG_PROC_FS */ 3475 3476 #if IS_ENABLED(CONFIG_IPV6_MIP6) 3477 /* Check if address is a home address configured on any interface. */ 3478 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr) 3479 { 3480 int ret = 0; 3481 struct inet6_ifaddr *ifp = NULL; 3482 unsigned int hash = inet6_addr_hash(addr); 3483 3484 rcu_read_lock_bh(); 3485 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) { 3486 if (!net_eq(dev_net(ifp->idev->dev), net)) 3487 continue; 3488 if (ipv6_addr_equal(&ifp->addr, addr) && 3489 (ifp->flags & IFA_F_HOMEADDRESS)) { 3490 ret = 1; 3491 break; 3492 } 3493 } 3494 rcu_read_unlock_bh(); 3495 return ret; 3496 } 3497 #endif 3498 3499 /* 3500 * Periodic address status verification 3501 */ 3502 3503 static void addrconf_verify(unsigned long foo) 3504 { 3505 unsigned long now, next, next_sec, next_sched; 3506 struct inet6_ifaddr *ifp; 3507 int i; 3508 3509 rcu_read_lock_bh(); 3510 spin_lock(&addrconf_verify_lock); 3511 now = jiffies; 3512 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY); 3513 3514 del_timer(&addr_chk_timer); 3515 3516 for (i = 0; i < IN6_ADDR_HSIZE; i++) { 3517 restart: 3518 hlist_for_each_entry_rcu_bh(ifp, 3519 &inet6_addr_lst[i], addr_lst) { 3520 unsigned long age; 3521 3522 if (ifp->flags & IFA_F_PERMANENT) 3523 continue; 3524 3525 spin_lock(&ifp->lock); 3526 /* We try to batch several events at once. */ 3527 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ; 3528 3529 if (ifp->valid_lft != INFINITY_LIFE_TIME && 3530 age >= ifp->valid_lft) { 3531 spin_unlock(&ifp->lock); 3532 in6_ifa_hold(ifp); 3533 ipv6_del_addr(ifp); 3534 goto restart; 3535 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) { 3536 spin_unlock(&ifp->lock); 3537 continue; 3538 } else if (age >= ifp->prefered_lft) { 3539 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */ 3540 int deprecate = 0; 3541 3542 if (!(ifp->flags&IFA_F_DEPRECATED)) { 3543 deprecate = 1; 3544 ifp->flags |= IFA_F_DEPRECATED; 3545 } 3546 3547 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next)) 3548 next = ifp->tstamp + ifp->valid_lft * HZ; 3549 3550 spin_unlock(&ifp->lock); 3551 3552 if (deprecate) { 3553 in6_ifa_hold(ifp); 3554 3555 ipv6_ifa_notify(0, ifp); 3556 in6_ifa_put(ifp); 3557 goto restart; 3558 } 3559 #ifdef CONFIG_IPV6_PRIVACY 3560 } else if ((ifp->flags&IFA_F_TEMPORARY) && 3561 !(ifp->flags&IFA_F_TENTATIVE)) { 3562 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry * 3563 ifp->idev->cnf.dad_transmits * 3564 ifp->idev->nd_parms->retrans_time / HZ; 3565 3566 if (age >= ifp->prefered_lft - regen_advance) { 3567 struct inet6_ifaddr *ifpub = ifp->ifpub; 3568 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 3569 next = ifp->tstamp + ifp->prefered_lft * HZ; 3570 if (!ifp->regen_count && ifpub) { 3571 ifp->regen_count++; 3572 in6_ifa_hold(ifp); 3573 in6_ifa_hold(ifpub); 3574 spin_unlock(&ifp->lock); 3575 3576 spin_lock(&ifpub->lock); 3577 ifpub->regen_count = 0; 3578 spin_unlock(&ifpub->lock); 3579 ipv6_create_tempaddr(ifpub, ifp); 3580 in6_ifa_put(ifpub); 3581 in6_ifa_put(ifp); 3582 goto restart; 3583 } 3584 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next)) 3585 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ; 3586 spin_unlock(&ifp->lock); 3587 #endif 3588 } else { 3589 /* ifp->prefered_lft <= ifp->valid_lft */ 3590 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 3591 next = ifp->tstamp + ifp->prefered_lft * HZ; 3592 spin_unlock(&ifp->lock); 3593 } 3594 } 3595 } 3596 3597 next_sec = round_jiffies_up(next); 3598 next_sched = next; 3599 3600 /* If rounded timeout is accurate enough, accept it. */ 3601 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ)) 3602 next_sched = next_sec; 3603 3604 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */ 3605 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX)) 3606 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX; 3607 3608 ADBG((KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n", 3609 now, next, next_sec, next_sched)); 3610 3611 addr_chk_timer.expires = next_sched; 3612 add_timer(&addr_chk_timer); 3613 spin_unlock(&addrconf_verify_lock); 3614 rcu_read_unlock_bh(); 3615 } 3616 3617 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local, 3618 struct in6_addr **peer_pfx) 3619 { 3620 struct in6_addr *pfx = NULL; 3621 3622 *peer_pfx = NULL; 3623 3624 if (addr) 3625 pfx = nla_data(addr); 3626 3627 if (local) { 3628 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx))) 3629 *peer_pfx = pfx; 3630 pfx = nla_data(local); 3631 } 3632 3633 return pfx; 3634 } 3635 3636 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = { 3637 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) }, 3638 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) }, 3639 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) }, 3640 }; 3641 3642 static int 3643 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh) 3644 { 3645 struct net *net = sock_net(skb->sk); 3646 struct ifaddrmsg *ifm; 3647 struct nlattr *tb[IFA_MAX+1]; 3648 struct in6_addr *pfx, *peer_pfx; 3649 int err; 3650 3651 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy); 3652 if (err < 0) 3653 return err; 3654 3655 ifm = nlmsg_data(nlh); 3656 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx); 3657 if (pfx == NULL) 3658 return -EINVAL; 3659 3660 return inet6_addr_del(net, ifm->ifa_index, pfx, ifm->ifa_prefixlen); 3661 } 3662 3663 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags, 3664 u32 prefered_lft, u32 valid_lft) 3665 { 3666 u32 flags; 3667 clock_t expires; 3668 unsigned long timeout; 3669 3670 if (!valid_lft || (prefered_lft > valid_lft)) 3671 return -EINVAL; 3672 3673 timeout = addrconf_timeout_fixup(valid_lft, HZ); 3674 if (addrconf_finite_timeout(timeout)) { 3675 expires = jiffies_to_clock_t(timeout * HZ); 3676 valid_lft = timeout; 3677 flags = RTF_EXPIRES; 3678 } else { 3679 expires = 0; 3680 flags = 0; 3681 ifa_flags |= IFA_F_PERMANENT; 3682 } 3683 3684 timeout = addrconf_timeout_fixup(prefered_lft, HZ); 3685 if (addrconf_finite_timeout(timeout)) { 3686 if (timeout == 0) 3687 ifa_flags |= IFA_F_DEPRECATED; 3688 prefered_lft = timeout; 3689 } 3690 3691 spin_lock_bh(&ifp->lock); 3692 ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags; 3693 ifp->tstamp = jiffies; 3694 ifp->valid_lft = valid_lft; 3695 ifp->prefered_lft = prefered_lft; 3696 3697 spin_unlock_bh(&ifp->lock); 3698 if (!(ifp->flags&IFA_F_TENTATIVE)) 3699 ipv6_ifa_notify(0, ifp); 3700 3701 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev, 3702 expires, flags); 3703 addrconf_verify(0); 3704 3705 return 0; 3706 } 3707 3708 static int 3709 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh) 3710 { 3711 struct net *net = sock_net(skb->sk); 3712 struct ifaddrmsg *ifm; 3713 struct nlattr *tb[IFA_MAX+1]; 3714 struct in6_addr *pfx, *peer_pfx; 3715 struct inet6_ifaddr *ifa; 3716 struct net_device *dev; 3717 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME; 3718 u8 ifa_flags; 3719 int err; 3720 3721 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy); 3722 if (err < 0) 3723 return err; 3724 3725 ifm = nlmsg_data(nlh); 3726 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx); 3727 if (pfx == NULL) 3728 return -EINVAL; 3729 3730 if (tb[IFA_CACHEINFO]) { 3731 struct ifa_cacheinfo *ci; 3732 3733 ci = nla_data(tb[IFA_CACHEINFO]); 3734 valid_lft = ci->ifa_valid; 3735 preferred_lft = ci->ifa_prefered; 3736 } else { 3737 preferred_lft = INFINITY_LIFE_TIME; 3738 valid_lft = INFINITY_LIFE_TIME; 3739 } 3740 3741 dev = __dev_get_by_index(net, ifm->ifa_index); 3742 if (dev == NULL) 3743 return -ENODEV; 3744 3745 /* We ignore other flags so far. */ 3746 ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS); 3747 3748 ifa = ipv6_get_ifaddr(net, pfx, dev, 1); 3749 if (ifa == NULL) { 3750 /* 3751 * It would be best to check for !NLM_F_CREATE here but 3752 * userspace alreay relies on not having to provide this. 3753 */ 3754 return inet6_addr_add(net, ifm->ifa_index, pfx, peer_pfx, 3755 ifm->ifa_prefixlen, ifa_flags, 3756 preferred_lft, valid_lft); 3757 } 3758 3759 if (nlh->nlmsg_flags & NLM_F_EXCL || 3760 !(nlh->nlmsg_flags & NLM_F_REPLACE)) 3761 err = -EEXIST; 3762 else 3763 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft); 3764 3765 in6_ifa_put(ifa); 3766 3767 return err; 3768 } 3769 3770 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags, 3771 u8 scope, int ifindex) 3772 { 3773 struct ifaddrmsg *ifm; 3774 3775 ifm = nlmsg_data(nlh); 3776 ifm->ifa_family = AF_INET6; 3777 ifm->ifa_prefixlen = prefixlen; 3778 ifm->ifa_flags = flags; 3779 ifm->ifa_scope = scope; 3780 ifm->ifa_index = ifindex; 3781 } 3782 3783 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp, 3784 unsigned long tstamp, u32 preferred, u32 valid) 3785 { 3786 struct ifa_cacheinfo ci; 3787 3788 ci.cstamp = cstamp_delta(cstamp); 3789 ci.tstamp = cstamp_delta(tstamp); 3790 ci.ifa_prefered = preferred; 3791 ci.ifa_valid = valid; 3792 3793 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci); 3794 } 3795 3796 static inline int rt_scope(int ifa_scope) 3797 { 3798 if (ifa_scope & IFA_HOST) 3799 return RT_SCOPE_HOST; 3800 else if (ifa_scope & IFA_LINK) 3801 return RT_SCOPE_LINK; 3802 else if (ifa_scope & IFA_SITE) 3803 return RT_SCOPE_SITE; 3804 else 3805 return RT_SCOPE_UNIVERSE; 3806 } 3807 3808 static inline int inet6_ifaddr_msgsize(void) 3809 { 3810 return NLMSG_ALIGN(sizeof(struct ifaddrmsg)) 3811 + nla_total_size(16) /* IFA_LOCAL */ 3812 + nla_total_size(16) /* IFA_ADDRESS */ 3813 + nla_total_size(sizeof(struct ifa_cacheinfo)); 3814 } 3815 3816 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa, 3817 u32 portid, u32 seq, int event, unsigned int flags) 3818 { 3819 struct nlmsghdr *nlh; 3820 u32 preferred, valid; 3821 3822 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags); 3823 if (nlh == NULL) 3824 return -EMSGSIZE; 3825 3826 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope), 3827 ifa->idev->dev->ifindex); 3828 3829 if (!(ifa->flags&IFA_F_PERMANENT)) { 3830 preferred = ifa->prefered_lft; 3831 valid = ifa->valid_lft; 3832 if (preferred != INFINITY_LIFE_TIME) { 3833 long tval = (jiffies - ifa->tstamp)/HZ; 3834 if (preferred > tval) 3835 preferred -= tval; 3836 else 3837 preferred = 0; 3838 if (valid != INFINITY_LIFE_TIME) { 3839 if (valid > tval) 3840 valid -= tval; 3841 else 3842 valid = 0; 3843 } 3844 } 3845 } else { 3846 preferred = INFINITY_LIFE_TIME; 3847 valid = INFINITY_LIFE_TIME; 3848 } 3849 3850 if (!ipv6_addr_any(&ifa->peer_addr)) { 3851 if (nla_put(skb, IFA_LOCAL, 16, &ifa->addr) < 0 || 3852 nla_put(skb, IFA_ADDRESS, 16, &ifa->peer_addr) < 0) 3853 goto error; 3854 } else 3855 if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0) 3856 goto error; 3857 3858 if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) 3859 goto error; 3860 3861 return nlmsg_end(skb, nlh); 3862 3863 error: 3864 nlmsg_cancel(skb, nlh); 3865 return -EMSGSIZE; 3866 } 3867 3868 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca, 3869 u32 portid, u32 seq, int event, u16 flags) 3870 { 3871 struct nlmsghdr *nlh; 3872 u8 scope = RT_SCOPE_UNIVERSE; 3873 int ifindex = ifmca->idev->dev->ifindex; 3874 3875 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE) 3876 scope = RT_SCOPE_SITE; 3877 3878 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags); 3879 if (nlh == NULL) 3880 return -EMSGSIZE; 3881 3882 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 3883 if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 || 3884 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp, 3885 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 3886 nlmsg_cancel(skb, nlh); 3887 return -EMSGSIZE; 3888 } 3889 3890 return nlmsg_end(skb, nlh); 3891 } 3892 3893 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca, 3894 u32 portid, u32 seq, int event, unsigned int flags) 3895 { 3896 struct nlmsghdr *nlh; 3897 u8 scope = RT_SCOPE_UNIVERSE; 3898 int ifindex = ifaca->aca_idev->dev->ifindex; 3899 3900 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE) 3901 scope = RT_SCOPE_SITE; 3902 3903 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags); 3904 if (nlh == NULL) 3905 return -EMSGSIZE; 3906 3907 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 3908 if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 || 3909 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp, 3910 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 3911 nlmsg_cancel(skb, nlh); 3912 return -EMSGSIZE; 3913 } 3914 3915 return nlmsg_end(skb, nlh); 3916 } 3917 3918 enum addr_type_t { 3919 UNICAST_ADDR, 3920 MULTICAST_ADDR, 3921 ANYCAST_ADDR, 3922 }; 3923 3924 /* called with rcu_read_lock() */ 3925 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb, 3926 struct netlink_callback *cb, enum addr_type_t type, 3927 int s_ip_idx, int *p_ip_idx) 3928 { 3929 struct ifmcaddr6 *ifmca; 3930 struct ifacaddr6 *ifaca; 3931 int err = 1; 3932 int ip_idx = *p_ip_idx; 3933 3934 read_lock_bh(&idev->lock); 3935 switch (type) { 3936 case UNICAST_ADDR: { 3937 struct inet6_ifaddr *ifa; 3938 3939 /* unicast address incl. temp addr */ 3940 list_for_each_entry(ifa, &idev->addr_list, if_list) { 3941 if (++ip_idx < s_ip_idx) 3942 continue; 3943 err = inet6_fill_ifaddr(skb, ifa, 3944 NETLINK_CB(cb->skb).portid, 3945 cb->nlh->nlmsg_seq, 3946 RTM_NEWADDR, 3947 NLM_F_MULTI); 3948 if (err <= 0) 3949 break; 3950 nl_dump_check_consistent(cb, nlmsg_hdr(skb)); 3951 } 3952 break; 3953 } 3954 case MULTICAST_ADDR: 3955 /* multicast address */ 3956 for (ifmca = idev->mc_list; ifmca; 3957 ifmca = ifmca->next, ip_idx++) { 3958 if (ip_idx < s_ip_idx) 3959 continue; 3960 err = inet6_fill_ifmcaddr(skb, ifmca, 3961 NETLINK_CB(cb->skb).portid, 3962 cb->nlh->nlmsg_seq, 3963 RTM_GETMULTICAST, 3964 NLM_F_MULTI); 3965 if (err <= 0) 3966 break; 3967 } 3968 break; 3969 case ANYCAST_ADDR: 3970 /* anycast address */ 3971 for (ifaca = idev->ac_list; ifaca; 3972 ifaca = ifaca->aca_next, ip_idx++) { 3973 if (ip_idx < s_ip_idx) 3974 continue; 3975 err = inet6_fill_ifacaddr(skb, ifaca, 3976 NETLINK_CB(cb->skb).portid, 3977 cb->nlh->nlmsg_seq, 3978 RTM_GETANYCAST, 3979 NLM_F_MULTI); 3980 if (err <= 0) 3981 break; 3982 } 3983 break; 3984 default: 3985 break; 3986 } 3987 read_unlock_bh(&idev->lock); 3988 *p_ip_idx = ip_idx; 3989 return err; 3990 } 3991 3992 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb, 3993 enum addr_type_t type) 3994 { 3995 struct net *net = sock_net(skb->sk); 3996 int h, s_h; 3997 int idx, ip_idx; 3998 int s_idx, s_ip_idx; 3999 struct net_device *dev; 4000 struct inet6_dev *idev; 4001 struct hlist_head *head; 4002 4003 s_h = cb->args[0]; 4004 s_idx = idx = cb->args[1]; 4005 s_ip_idx = ip_idx = cb->args[2]; 4006 4007 rcu_read_lock(); 4008 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ net->dev_base_seq; 4009 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 4010 idx = 0; 4011 head = &net->dev_index_head[h]; 4012 hlist_for_each_entry_rcu(dev, head, index_hlist) { 4013 if (idx < s_idx) 4014 goto cont; 4015 if (h > s_h || idx > s_idx) 4016 s_ip_idx = 0; 4017 ip_idx = 0; 4018 idev = __in6_dev_get(dev); 4019 if (!idev) 4020 goto cont; 4021 4022 if (in6_dump_addrs(idev, skb, cb, type, 4023 s_ip_idx, &ip_idx) <= 0) 4024 goto done; 4025 cont: 4026 idx++; 4027 } 4028 } 4029 done: 4030 rcu_read_unlock(); 4031 cb->args[0] = h; 4032 cb->args[1] = idx; 4033 cb->args[2] = ip_idx; 4034 4035 return skb->len; 4036 } 4037 4038 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb) 4039 { 4040 enum addr_type_t type = UNICAST_ADDR; 4041 4042 return inet6_dump_addr(skb, cb, type); 4043 } 4044 4045 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb) 4046 { 4047 enum addr_type_t type = MULTICAST_ADDR; 4048 4049 return inet6_dump_addr(skb, cb, type); 4050 } 4051 4052 4053 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb) 4054 { 4055 enum addr_type_t type = ANYCAST_ADDR; 4056 4057 return inet6_dump_addr(skb, cb, type); 4058 } 4059 4060 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh) 4061 { 4062 struct net *net = sock_net(in_skb->sk); 4063 struct ifaddrmsg *ifm; 4064 struct nlattr *tb[IFA_MAX+1]; 4065 struct in6_addr *addr = NULL, *peer; 4066 struct net_device *dev = NULL; 4067 struct inet6_ifaddr *ifa; 4068 struct sk_buff *skb; 4069 int err; 4070 4071 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy); 4072 if (err < 0) 4073 goto errout; 4074 4075 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer); 4076 if (addr == NULL) { 4077 err = -EINVAL; 4078 goto errout; 4079 } 4080 4081 ifm = nlmsg_data(nlh); 4082 if (ifm->ifa_index) 4083 dev = __dev_get_by_index(net, ifm->ifa_index); 4084 4085 ifa = ipv6_get_ifaddr(net, addr, dev, 1); 4086 if (!ifa) { 4087 err = -EADDRNOTAVAIL; 4088 goto errout; 4089 } 4090 4091 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL); 4092 if (!skb) { 4093 err = -ENOBUFS; 4094 goto errout_ifa; 4095 } 4096 4097 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).portid, 4098 nlh->nlmsg_seq, RTM_NEWADDR, 0); 4099 if (err < 0) { 4100 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 4101 WARN_ON(err == -EMSGSIZE); 4102 kfree_skb(skb); 4103 goto errout_ifa; 4104 } 4105 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid); 4106 errout_ifa: 4107 in6_ifa_put(ifa); 4108 errout: 4109 return err; 4110 } 4111 4112 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa) 4113 { 4114 struct sk_buff *skb; 4115 struct net *net = dev_net(ifa->idev->dev); 4116 int err = -ENOBUFS; 4117 4118 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC); 4119 if (skb == NULL) 4120 goto errout; 4121 4122 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0); 4123 if (err < 0) { 4124 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 4125 WARN_ON(err == -EMSGSIZE); 4126 kfree_skb(skb); 4127 goto errout; 4128 } 4129 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC); 4130 return; 4131 errout: 4132 if (err < 0) 4133 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err); 4134 } 4135 4136 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf, 4137 __s32 *array, int bytes) 4138 { 4139 BUG_ON(bytes < (DEVCONF_MAX * 4)); 4140 4141 memset(array, 0, bytes); 4142 array[DEVCONF_FORWARDING] = cnf->forwarding; 4143 array[DEVCONF_HOPLIMIT] = cnf->hop_limit; 4144 array[DEVCONF_MTU6] = cnf->mtu6; 4145 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra; 4146 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects; 4147 array[DEVCONF_AUTOCONF] = cnf->autoconf; 4148 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits; 4149 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits; 4150 array[DEVCONF_RTR_SOLICIT_INTERVAL] = 4151 jiffies_to_msecs(cnf->rtr_solicit_interval); 4152 array[DEVCONF_RTR_SOLICIT_DELAY] = 4153 jiffies_to_msecs(cnf->rtr_solicit_delay); 4154 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version; 4155 #ifdef CONFIG_IPV6_PRIVACY 4156 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr; 4157 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft; 4158 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft; 4159 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry; 4160 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor; 4161 #endif 4162 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses; 4163 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr; 4164 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo; 4165 #ifdef CONFIG_IPV6_ROUTER_PREF 4166 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref; 4167 array[DEVCONF_RTR_PROBE_INTERVAL] = 4168 jiffies_to_msecs(cnf->rtr_probe_interval); 4169 #ifdef CONFIG_IPV6_ROUTE_INFO 4170 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen; 4171 #endif 4172 #endif 4173 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp; 4174 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route; 4175 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 4176 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad; 4177 #endif 4178 #ifdef CONFIG_IPV6_MROUTE 4179 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding; 4180 #endif 4181 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6; 4182 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad; 4183 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao; 4184 array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify; 4185 } 4186 4187 static inline size_t inet6_ifla6_size(void) 4188 { 4189 return nla_total_size(4) /* IFLA_INET6_FLAGS */ 4190 + nla_total_size(sizeof(struct ifla_cacheinfo)) 4191 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */ 4192 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */ 4193 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */ 4194 + nla_total_size(sizeof(struct in6_addr)); /* IFLA_INET6_TOKEN */ 4195 } 4196 4197 static inline size_t inet6_if_nlmsg_size(void) 4198 { 4199 return NLMSG_ALIGN(sizeof(struct ifinfomsg)) 4200 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */ 4201 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */ 4202 + nla_total_size(4) /* IFLA_MTU */ 4203 + nla_total_size(4) /* IFLA_LINK */ 4204 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */ 4205 } 4206 4207 static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib, 4208 int items, int bytes) 4209 { 4210 int i; 4211 int pad = bytes - sizeof(u64) * items; 4212 BUG_ON(pad < 0); 4213 4214 /* Use put_unaligned() because stats may not be aligned for u64. */ 4215 put_unaligned(items, &stats[0]); 4216 for (i = 1; i < items; i++) 4217 put_unaligned(atomic_long_read(&mib[i]), &stats[i]); 4218 4219 memset(&stats[items], 0, pad); 4220 } 4221 4222 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu **mib, 4223 int items, int bytes, size_t syncpoff) 4224 { 4225 int i; 4226 int pad = bytes - sizeof(u64) * items; 4227 BUG_ON(pad < 0); 4228 4229 /* Use put_unaligned() because stats may not be aligned for u64. */ 4230 put_unaligned(items, &stats[0]); 4231 for (i = 1; i < items; i++) 4232 put_unaligned(snmp_fold_field64(mib, i, syncpoff), &stats[i]); 4233 4234 memset(&stats[items], 0, pad); 4235 } 4236 4237 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype, 4238 int bytes) 4239 { 4240 switch (attrtype) { 4241 case IFLA_INET6_STATS: 4242 __snmp6_fill_stats64(stats, (void __percpu **)idev->stats.ipv6, 4243 IPSTATS_MIB_MAX, bytes, offsetof(struct ipstats_mib, syncp)); 4244 break; 4245 case IFLA_INET6_ICMP6STATS: 4246 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, ICMP6_MIB_MAX, bytes); 4247 break; 4248 } 4249 } 4250 4251 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev) 4252 { 4253 struct nlattr *nla; 4254 struct ifla_cacheinfo ci; 4255 4256 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags)) 4257 goto nla_put_failure; 4258 ci.max_reasm_len = IPV6_MAXPLEN; 4259 ci.tstamp = cstamp_delta(idev->tstamp); 4260 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time); 4261 ci.retrans_time = jiffies_to_msecs(idev->nd_parms->retrans_time); 4262 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci)) 4263 goto nla_put_failure; 4264 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32)); 4265 if (nla == NULL) 4266 goto nla_put_failure; 4267 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla)); 4268 4269 /* XXX - MC not implemented */ 4270 4271 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64)); 4272 if (nla == NULL) 4273 goto nla_put_failure; 4274 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla)); 4275 4276 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64)); 4277 if (nla == NULL) 4278 goto nla_put_failure; 4279 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla)); 4280 4281 nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr)); 4282 if (nla == NULL) 4283 goto nla_put_failure; 4284 read_lock_bh(&idev->lock); 4285 memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla)); 4286 read_unlock_bh(&idev->lock); 4287 4288 return 0; 4289 4290 nla_put_failure: 4291 return -EMSGSIZE; 4292 } 4293 4294 static size_t inet6_get_link_af_size(const struct net_device *dev) 4295 { 4296 if (!__in6_dev_get(dev)) 4297 return 0; 4298 4299 return inet6_ifla6_size(); 4300 } 4301 4302 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev) 4303 { 4304 struct inet6_dev *idev = __in6_dev_get(dev); 4305 4306 if (!idev) 4307 return -ENODATA; 4308 4309 if (inet6_fill_ifla6_attrs(skb, idev) < 0) 4310 return -EMSGSIZE; 4311 4312 return 0; 4313 } 4314 4315 static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token) 4316 { 4317 struct inet6_ifaddr *ifp; 4318 struct net_device *dev = idev->dev; 4319 bool update_rs = false; 4320 4321 if (token == NULL) 4322 return -EINVAL; 4323 if (ipv6_addr_any(token)) 4324 return -EINVAL; 4325 if (dev->flags & (IFF_LOOPBACK | IFF_NOARP)) 4326 return -EINVAL; 4327 if (!ipv6_accept_ra(idev)) 4328 return -EINVAL; 4329 if (idev->cnf.rtr_solicits <= 0) 4330 return -EINVAL; 4331 4332 write_lock_bh(&idev->lock); 4333 4334 BUILD_BUG_ON(sizeof(token->s6_addr) != 16); 4335 memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8); 4336 4337 write_unlock_bh(&idev->lock); 4338 4339 if (!idev->dead && (idev->if_flags & IF_READY)) { 4340 struct in6_addr ll_addr; 4341 4342 ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE | 4343 IFA_F_OPTIMISTIC); 4344 4345 /* If we're not ready, then normal ifup will take care 4346 * of this. Otherwise, we need to request our rs here. 4347 */ 4348 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters); 4349 update_rs = true; 4350 } 4351 4352 write_lock_bh(&idev->lock); 4353 4354 if (update_rs) 4355 idev->if_flags |= IF_RS_SENT; 4356 4357 /* Well, that's kinda nasty ... */ 4358 list_for_each_entry(ifp, &idev->addr_list, if_list) { 4359 spin_lock(&ifp->lock); 4360 if (ifp->tokenized) { 4361 ifp->valid_lft = 0; 4362 ifp->prefered_lft = 0; 4363 } 4364 spin_unlock(&ifp->lock); 4365 } 4366 4367 write_unlock_bh(&idev->lock); 4368 return 0; 4369 } 4370 4371 static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla) 4372 { 4373 int err = -EINVAL; 4374 struct inet6_dev *idev = __in6_dev_get(dev); 4375 struct nlattr *tb[IFLA_INET6_MAX + 1]; 4376 4377 if (!idev) 4378 return -EAFNOSUPPORT; 4379 4380 if (nla_parse_nested(tb, IFLA_INET6_MAX, nla, NULL) < 0) 4381 BUG(); 4382 4383 if (tb[IFLA_INET6_TOKEN]) 4384 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN])); 4385 4386 return err; 4387 } 4388 4389 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev, 4390 u32 portid, u32 seq, int event, unsigned int flags) 4391 { 4392 struct net_device *dev = idev->dev; 4393 struct ifinfomsg *hdr; 4394 struct nlmsghdr *nlh; 4395 void *protoinfo; 4396 4397 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags); 4398 if (nlh == NULL) 4399 return -EMSGSIZE; 4400 4401 hdr = nlmsg_data(nlh); 4402 hdr->ifi_family = AF_INET6; 4403 hdr->__ifi_pad = 0; 4404 hdr->ifi_type = dev->type; 4405 hdr->ifi_index = dev->ifindex; 4406 hdr->ifi_flags = dev_get_flags(dev); 4407 hdr->ifi_change = 0; 4408 4409 if (nla_put_string(skb, IFLA_IFNAME, dev->name) || 4410 (dev->addr_len && 4411 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) || 4412 nla_put_u32(skb, IFLA_MTU, dev->mtu) || 4413 (dev->ifindex != dev->iflink && 4414 nla_put_u32(skb, IFLA_LINK, dev->iflink))) 4415 goto nla_put_failure; 4416 protoinfo = nla_nest_start(skb, IFLA_PROTINFO); 4417 if (protoinfo == NULL) 4418 goto nla_put_failure; 4419 4420 if (inet6_fill_ifla6_attrs(skb, idev) < 0) 4421 goto nla_put_failure; 4422 4423 nla_nest_end(skb, protoinfo); 4424 return nlmsg_end(skb, nlh); 4425 4426 nla_put_failure: 4427 nlmsg_cancel(skb, nlh); 4428 return -EMSGSIZE; 4429 } 4430 4431 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb) 4432 { 4433 struct net *net = sock_net(skb->sk); 4434 int h, s_h; 4435 int idx = 0, s_idx; 4436 struct net_device *dev; 4437 struct inet6_dev *idev; 4438 struct hlist_head *head; 4439 4440 s_h = cb->args[0]; 4441 s_idx = cb->args[1]; 4442 4443 rcu_read_lock(); 4444 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 4445 idx = 0; 4446 head = &net->dev_index_head[h]; 4447 hlist_for_each_entry_rcu(dev, head, index_hlist) { 4448 if (idx < s_idx) 4449 goto cont; 4450 idev = __in6_dev_get(dev); 4451 if (!idev) 4452 goto cont; 4453 if (inet6_fill_ifinfo(skb, idev, 4454 NETLINK_CB(cb->skb).portid, 4455 cb->nlh->nlmsg_seq, 4456 RTM_NEWLINK, NLM_F_MULTI) <= 0) 4457 goto out; 4458 cont: 4459 idx++; 4460 } 4461 } 4462 out: 4463 rcu_read_unlock(); 4464 cb->args[1] = idx; 4465 cb->args[0] = h; 4466 4467 return skb->len; 4468 } 4469 4470 void inet6_ifinfo_notify(int event, struct inet6_dev *idev) 4471 { 4472 struct sk_buff *skb; 4473 struct net *net = dev_net(idev->dev); 4474 int err = -ENOBUFS; 4475 4476 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC); 4477 if (skb == NULL) 4478 goto errout; 4479 4480 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0); 4481 if (err < 0) { 4482 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */ 4483 WARN_ON(err == -EMSGSIZE); 4484 kfree_skb(skb); 4485 goto errout; 4486 } 4487 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC); 4488 return; 4489 errout: 4490 if (err < 0) 4491 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err); 4492 } 4493 4494 static inline size_t inet6_prefix_nlmsg_size(void) 4495 { 4496 return NLMSG_ALIGN(sizeof(struct prefixmsg)) 4497 + nla_total_size(sizeof(struct in6_addr)) 4498 + nla_total_size(sizeof(struct prefix_cacheinfo)); 4499 } 4500 4501 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev, 4502 struct prefix_info *pinfo, u32 portid, u32 seq, 4503 int event, unsigned int flags) 4504 { 4505 struct prefixmsg *pmsg; 4506 struct nlmsghdr *nlh; 4507 struct prefix_cacheinfo ci; 4508 4509 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags); 4510 if (nlh == NULL) 4511 return -EMSGSIZE; 4512 4513 pmsg = nlmsg_data(nlh); 4514 pmsg->prefix_family = AF_INET6; 4515 pmsg->prefix_pad1 = 0; 4516 pmsg->prefix_pad2 = 0; 4517 pmsg->prefix_ifindex = idev->dev->ifindex; 4518 pmsg->prefix_len = pinfo->prefix_len; 4519 pmsg->prefix_type = pinfo->type; 4520 pmsg->prefix_pad3 = 0; 4521 pmsg->prefix_flags = 0; 4522 if (pinfo->onlink) 4523 pmsg->prefix_flags |= IF_PREFIX_ONLINK; 4524 if (pinfo->autoconf) 4525 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF; 4526 4527 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix)) 4528 goto nla_put_failure; 4529 ci.preferred_time = ntohl(pinfo->prefered); 4530 ci.valid_time = ntohl(pinfo->valid); 4531 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci)) 4532 goto nla_put_failure; 4533 return nlmsg_end(skb, nlh); 4534 4535 nla_put_failure: 4536 nlmsg_cancel(skb, nlh); 4537 return -EMSGSIZE; 4538 } 4539 4540 static void inet6_prefix_notify(int event, struct inet6_dev *idev, 4541 struct prefix_info *pinfo) 4542 { 4543 struct sk_buff *skb; 4544 struct net *net = dev_net(idev->dev); 4545 int err = -ENOBUFS; 4546 4547 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC); 4548 if (skb == NULL) 4549 goto errout; 4550 4551 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0); 4552 if (err < 0) { 4553 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */ 4554 WARN_ON(err == -EMSGSIZE); 4555 kfree_skb(skb); 4556 goto errout; 4557 } 4558 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC); 4559 return; 4560 errout: 4561 if (err < 0) 4562 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err); 4563 } 4564 4565 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 4566 { 4567 struct net *net = dev_net(ifp->idev->dev); 4568 4569 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp); 4570 4571 switch (event) { 4572 case RTM_NEWADDR: 4573 /* 4574 * If the address was optimistic 4575 * we inserted the route at the start of 4576 * our DAD process, so we don't need 4577 * to do it again 4578 */ 4579 if (!(ifp->rt->rt6i_node)) 4580 ip6_ins_rt(ifp->rt); 4581 if (ifp->idev->cnf.forwarding) 4582 addrconf_join_anycast(ifp); 4583 if (!ipv6_addr_any(&ifp->peer_addr)) 4584 addrconf_prefix_route(&ifp->peer_addr, 128, 4585 ifp->idev->dev, 0, 0); 4586 break; 4587 case RTM_DELADDR: 4588 if (ifp->idev->cnf.forwarding) 4589 addrconf_leave_anycast(ifp); 4590 addrconf_leave_solict(ifp->idev, &ifp->addr); 4591 if (!ipv6_addr_any(&ifp->peer_addr)) { 4592 struct rt6_info *rt; 4593 struct net_device *dev = ifp->idev->dev; 4594 4595 rt = rt6_lookup(dev_net(dev), &ifp->peer_addr, NULL, 4596 dev->ifindex, 1); 4597 if (rt) { 4598 dst_hold(&rt->dst); 4599 if (ip6_del_rt(rt)) 4600 dst_free(&rt->dst); 4601 } 4602 } 4603 dst_hold(&ifp->rt->dst); 4604 4605 if (ip6_del_rt(ifp->rt)) 4606 dst_free(&ifp->rt->dst); 4607 break; 4608 } 4609 atomic_inc(&net->ipv6.dev_addr_genid); 4610 } 4611 4612 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 4613 { 4614 rcu_read_lock_bh(); 4615 if (likely(ifp->idev->dead == 0)) 4616 __ipv6_ifa_notify(event, ifp); 4617 rcu_read_unlock_bh(); 4618 } 4619 4620 #ifdef CONFIG_SYSCTL 4621 4622 static 4623 int addrconf_sysctl_forward(struct ctl_table *ctl, int write, 4624 void __user *buffer, size_t *lenp, loff_t *ppos) 4625 { 4626 int *valp = ctl->data; 4627 int val = *valp; 4628 loff_t pos = *ppos; 4629 struct ctl_table lctl; 4630 int ret; 4631 4632 /* 4633 * ctl->data points to idev->cnf.forwarding, we should 4634 * not modify it until we get the rtnl lock. 4635 */ 4636 lctl = *ctl; 4637 lctl.data = &val; 4638 4639 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 4640 4641 if (write) 4642 ret = addrconf_fixup_forwarding(ctl, valp, val); 4643 if (ret) 4644 *ppos = pos; 4645 return ret; 4646 } 4647 4648 static void dev_disable_change(struct inet6_dev *idev) 4649 { 4650 struct netdev_notifier_info info; 4651 4652 if (!idev || !idev->dev) 4653 return; 4654 4655 netdev_notifier_info_init(&info, idev->dev); 4656 if (idev->cnf.disable_ipv6) 4657 addrconf_notify(NULL, NETDEV_DOWN, &info); 4658 else 4659 addrconf_notify(NULL, NETDEV_UP, &info); 4660 } 4661 4662 static void addrconf_disable_change(struct net *net, __s32 newf) 4663 { 4664 struct net_device *dev; 4665 struct inet6_dev *idev; 4666 4667 rcu_read_lock(); 4668 for_each_netdev_rcu(net, dev) { 4669 idev = __in6_dev_get(dev); 4670 if (idev) { 4671 int changed = (!idev->cnf.disable_ipv6) ^ (!newf); 4672 idev->cnf.disable_ipv6 = newf; 4673 if (changed) 4674 dev_disable_change(idev); 4675 } 4676 } 4677 rcu_read_unlock(); 4678 } 4679 4680 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf) 4681 { 4682 struct net *net; 4683 int old; 4684 4685 if (!rtnl_trylock()) 4686 return restart_syscall(); 4687 4688 net = (struct net *)table->extra2; 4689 old = *p; 4690 *p = newf; 4691 4692 if (p == &net->ipv6.devconf_dflt->disable_ipv6) { 4693 rtnl_unlock(); 4694 return 0; 4695 } 4696 4697 if (p == &net->ipv6.devconf_all->disable_ipv6) { 4698 net->ipv6.devconf_dflt->disable_ipv6 = newf; 4699 addrconf_disable_change(net, newf); 4700 } else if ((!newf) ^ (!old)) 4701 dev_disable_change((struct inet6_dev *)table->extra1); 4702 4703 rtnl_unlock(); 4704 return 0; 4705 } 4706 4707 static 4708 int addrconf_sysctl_disable(struct ctl_table *ctl, int write, 4709 void __user *buffer, size_t *lenp, loff_t *ppos) 4710 { 4711 int *valp = ctl->data; 4712 int val = *valp; 4713 loff_t pos = *ppos; 4714 struct ctl_table lctl; 4715 int ret; 4716 4717 /* 4718 * ctl->data points to idev->cnf.disable_ipv6, we should 4719 * not modify it until we get the rtnl lock. 4720 */ 4721 lctl = *ctl; 4722 lctl.data = &val; 4723 4724 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 4725 4726 if (write) 4727 ret = addrconf_disable_ipv6(ctl, valp, val); 4728 if (ret) 4729 *ppos = pos; 4730 return ret; 4731 } 4732 4733 static struct addrconf_sysctl_table 4734 { 4735 struct ctl_table_header *sysctl_header; 4736 struct ctl_table addrconf_vars[DEVCONF_MAX+1]; 4737 } addrconf_sysctl __read_mostly = { 4738 .sysctl_header = NULL, 4739 .addrconf_vars = { 4740 { 4741 .procname = "forwarding", 4742 .data = &ipv6_devconf.forwarding, 4743 .maxlen = sizeof(int), 4744 .mode = 0644, 4745 .proc_handler = addrconf_sysctl_forward, 4746 }, 4747 { 4748 .procname = "hop_limit", 4749 .data = &ipv6_devconf.hop_limit, 4750 .maxlen = sizeof(int), 4751 .mode = 0644, 4752 .proc_handler = proc_dointvec, 4753 }, 4754 { 4755 .procname = "mtu", 4756 .data = &ipv6_devconf.mtu6, 4757 .maxlen = sizeof(int), 4758 .mode = 0644, 4759 .proc_handler = proc_dointvec, 4760 }, 4761 { 4762 .procname = "accept_ra", 4763 .data = &ipv6_devconf.accept_ra, 4764 .maxlen = sizeof(int), 4765 .mode = 0644, 4766 .proc_handler = proc_dointvec, 4767 }, 4768 { 4769 .procname = "accept_redirects", 4770 .data = &ipv6_devconf.accept_redirects, 4771 .maxlen = sizeof(int), 4772 .mode = 0644, 4773 .proc_handler = proc_dointvec, 4774 }, 4775 { 4776 .procname = "autoconf", 4777 .data = &ipv6_devconf.autoconf, 4778 .maxlen = sizeof(int), 4779 .mode = 0644, 4780 .proc_handler = proc_dointvec, 4781 }, 4782 { 4783 .procname = "dad_transmits", 4784 .data = &ipv6_devconf.dad_transmits, 4785 .maxlen = sizeof(int), 4786 .mode = 0644, 4787 .proc_handler = proc_dointvec, 4788 }, 4789 { 4790 .procname = "router_solicitations", 4791 .data = &ipv6_devconf.rtr_solicits, 4792 .maxlen = sizeof(int), 4793 .mode = 0644, 4794 .proc_handler = proc_dointvec, 4795 }, 4796 { 4797 .procname = "router_solicitation_interval", 4798 .data = &ipv6_devconf.rtr_solicit_interval, 4799 .maxlen = sizeof(int), 4800 .mode = 0644, 4801 .proc_handler = proc_dointvec_jiffies, 4802 }, 4803 { 4804 .procname = "router_solicitation_delay", 4805 .data = &ipv6_devconf.rtr_solicit_delay, 4806 .maxlen = sizeof(int), 4807 .mode = 0644, 4808 .proc_handler = proc_dointvec_jiffies, 4809 }, 4810 { 4811 .procname = "force_mld_version", 4812 .data = &ipv6_devconf.force_mld_version, 4813 .maxlen = sizeof(int), 4814 .mode = 0644, 4815 .proc_handler = proc_dointvec, 4816 }, 4817 #ifdef CONFIG_IPV6_PRIVACY 4818 { 4819 .procname = "use_tempaddr", 4820 .data = &ipv6_devconf.use_tempaddr, 4821 .maxlen = sizeof(int), 4822 .mode = 0644, 4823 .proc_handler = proc_dointvec, 4824 }, 4825 { 4826 .procname = "temp_valid_lft", 4827 .data = &ipv6_devconf.temp_valid_lft, 4828 .maxlen = sizeof(int), 4829 .mode = 0644, 4830 .proc_handler = proc_dointvec, 4831 }, 4832 { 4833 .procname = "temp_prefered_lft", 4834 .data = &ipv6_devconf.temp_prefered_lft, 4835 .maxlen = sizeof(int), 4836 .mode = 0644, 4837 .proc_handler = proc_dointvec, 4838 }, 4839 { 4840 .procname = "regen_max_retry", 4841 .data = &ipv6_devconf.regen_max_retry, 4842 .maxlen = sizeof(int), 4843 .mode = 0644, 4844 .proc_handler = proc_dointvec, 4845 }, 4846 { 4847 .procname = "max_desync_factor", 4848 .data = &ipv6_devconf.max_desync_factor, 4849 .maxlen = sizeof(int), 4850 .mode = 0644, 4851 .proc_handler = proc_dointvec, 4852 }, 4853 #endif 4854 { 4855 .procname = "max_addresses", 4856 .data = &ipv6_devconf.max_addresses, 4857 .maxlen = sizeof(int), 4858 .mode = 0644, 4859 .proc_handler = proc_dointvec, 4860 }, 4861 { 4862 .procname = "accept_ra_defrtr", 4863 .data = &ipv6_devconf.accept_ra_defrtr, 4864 .maxlen = sizeof(int), 4865 .mode = 0644, 4866 .proc_handler = proc_dointvec, 4867 }, 4868 { 4869 .procname = "accept_ra_pinfo", 4870 .data = &ipv6_devconf.accept_ra_pinfo, 4871 .maxlen = sizeof(int), 4872 .mode = 0644, 4873 .proc_handler = proc_dointvec, 4874 }, 4875 #ifdef CONFIG_IPV6_ROUTER_PREF 4876 { 4877 .procname = "accept_ra_rtr_pref", 4878 .data = &ipv6_devconf.accept_ra_rtr_pref, 4879 .maxlen = sizeof(int), 4880 .mode = 0644, 4881 .proc_handler = proc_dointvec, 4882 }, 4883 { 4884 .procname = "router_probe_interval", 4885 .data = &ipv6_devconf.rtr_probe_interval, 4886 .maxlen = sizeof(int), 4887 .mode = 0644, 4888 .proc_handler = proc_dointvec_jiffies, 4889 }, 4890 #ifdef CONFIG_IPV6_ROUTE_INFO 4891 { 4892 .procname = "accept_ra_rt_info_max_plen", 4893 .data = &ipv6_devconf.accept_ra_rt_info_max_plen, 4894 .maxlen = sizeof(int), 4895 .mode = 0644, 4896 .proc_handler = proc_dointvec, 4897 }, 4898 #endif 4899 #endif 4900 { 4901 .procname = "proxy_ndp", 4902 .data = &ipv6_devconf.proxy_ndp, 4903 .maxlen = sizeof(int), 4904 .mode = 0644, 4905 .proc_handler = proc_dointvec, 4906 }, 4907 { 4908 .procname = "accept_source_route", 4909 .data = &ipv6_devconf.accept_source_route, 4910 .maxlen = sizeof(int), 4911 .mode = 0644, 4912 .proc_handler = proc_dointvec, 4913 }, 4914 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 4915 { 4916 .procname = "optimistic_dad", 4917 .data = &ipv6_devconf.optimistic_dad, 4918 .maxlen = sizeof(int), 4919 .mode = 0644, 4920 .proc_handler = proc_dointvec, 4921 4922 }, 4923 #endif 4924 #ifdef CONFIG_IPV6_MROUTE 4925 { 4926 .procname = "mc_forwarding", 4927 .data = &ipv6_devconf.mc_forwarding, 4928 .maxlen = sizeof(int), 4929 .mode = 0444, 4930 .proc_handler = proc_dointvec, 4931 }, 4932 #endif 4933 { 4934 .procname = "disable_ipv6", 4935 .data = &ipv6_devconf.disable_ipv6, 4936 .maxlen = sizeof(int), 4937 .mode = 0644, 4938 .proc_handler = addrconf_sysctl_disable, 4939 }, 4940 { 4941 .procname = "accept_dad", 4942 .data = &ipv6_devconf.accept_dad, 4943 .maxlen = sizeof(int), 4944 .mode = 0644, 4945 .proc_handler = proc_dointvec, 4946 }, 4947 { 4948 .procname = "force_tllao", 4949 .data = &ipv6_devconf.force_tllao, 4950 .maxlen = sizeof(int), 4951 .mode = 0644, 4952 .proc_handler = proc_dointvec 4953 }, 4954 { 4955 .procname = "ndisc_notify", 4956 .data = &ipv6_devconf.ndisc_notify, 4957 .maxlen = sizeof(int), 4958 .mode = 0644, 4959 .proc_handler = proc_dointvec 4960 }, 4961 { 4962 /* sentinel */ 4963 } 4964 }, 4965 }; 4966 4967 static int __addrconf_sysctl_register(struct net *net, char *dev_name, 4968 struct inet6_dev *idev, struct ipv6_devconf *p) 4969 { 4970 int i; 4971 struct addrconf_sysctl_table *t; 4972 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ]; 4973 4974 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL); 4975 if (t == NULL) 4976 goto out; 4977 4978 for (i = 0; t->addrconf_vars[i].data; i++) { 4979 t->addrconf_vars[i].data += (char *)p - (char *)&ipv6_devconf; 4980 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */ 4981 t->addrconf_vars[i].extra2 = net; 4982 } 4983 4984 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name); 4985 4986 t->sysctl_header = register_net_sysctl(net, path, t->addrconf_vars); 4987 if (t->sysctl_header == NULL) 4988 goto free; 4989 4990 p->sysctl = t; 4991 return 0; 4992 4993 free: 4994 kfree(t); 4995 out: 4996 return -ENOBUFS; 4997 } 4998 4999 static void __addrconf_sysctl_unregister(struct ipv6_devconf *p) 5000 { 5001 struct addrconf_sysctl_table *t; 5002 5003 if (p->sysctl == NULL) 5004 return; 5005 5006 t = p->sysctl; 5007 p->sysctl = NULL; 5008 unregister_net_sysctl_table(t->sysctl_header); 5009 kfree(t); 5010 } 5011 5012 static void addrconf_sysctl_register(struct inet6_dev *idev) 5013 { 5014 neigh_sysctl_register(idev->dev, idev->nd_parms, "ipv6", 5015 &ndisc_ifinfo_sysctl_change); 5016 __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name, 5017 idev, &idev->cnf); 5018 } 5019 5020 static void addrconf_sysctl_unregister(struct inet6_dev *idev) 5021 { 5022 __addrconf_sysctl_unregister(&idev->cnf); 5023 neigh_sysctl_unregister(idev->nd_parms); 5024 } 5025 5026 5027 #endif 5028 5029 static int __net_init addrconf_init_net(struct net *net) 5030 { 5031 int err = -ENOMEM; 5032 struct ipv6_devconf *all, *dflt; 5033 5034 all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL); 5035 if (all == NULL) 5036 goto err_alloc_all; 5037 5038 dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL); 5039 if (dflt == NULL) 5040 goto err_alloc_dflt; 5041 5042 /* these will be inherited by all namespaces */ 5043 dflt->autoconf = ipv6_defaults.autoconf; 5044 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6; 5045 5046 net->ipv6.devconf_all = all; 5047 net->ipv6.devconf_dflt = dflt; 5048 5049 #ifdef CONFIG_SYSCTL 5050 err = __addrconf_sysctl_register(net, "all", NULL, all); 5051 if (err < 0) 5052 goto err_reg_all; 5053 5054 err = __addrconf_sysctl_register(net, "default", NULL, dflt); 5055 if (err < 0) 5056 goto err_reg_dflt; 5057 #endif 5058 return 0; 5059 5060 #ifdef CONFIG_SYSCTL 5061 err_reg_dflt: 5062 __addrconf_sysctl_unregister(all); 5063 err_reg_all: 5064 kfree(dflt); 5065 #endif 5066 err_alloc_dflt: 5067 kfree(all); 5068 err_alloc_all: 5069 return err; 5070 } 5071 5072 static void __net_exit addrconf_exit_net(struct net *net) 5073 { 5074 #ifdef CONFIG_SYSCTL 5075 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt); 5076 __addrconf_sysctl_unregister(net->ipv6.devconf_all); 5077 #endif 5078 if (!net_eq(net, &init_net)) { 5079 kfree(net->ipv6.devconf_dflt); 5080 kfree(net->ipv6.devconf_all); 5081 } 5082 } 5083 5084 static struct pernet_operations addrconf_ops = { 5085 .init = addrconf_init_net, 5086 .exit = addrconf_exit_net, 5087 }; 5088 5089 static struct rtnl_af_ops inet6_ops = { 5090 .family = AF_INET6, 5091 .fill_link_af = inet6_fill_link_af, 5092 .get_link_af_size = inet6_get_link_af_size, 5093 .set_link_af = inet6_set_link_af, 5094 }; 5095 5096 /* 5097 * Init / cleanup code 5098 */ 5099 5100 int __init addrconf_init(void) 5101 { 5102 int i, err; 5103 5104 err = ipv6_addr_label_init(); 5105 if (err < 0) { 5106 pr_crit("%s: cannot initialize default policy table: %d\n", 5107 __func__, err); 5108 goto out; 5109 } 5110 5111 err = register_pernet_subsys(&addrconf_ops); 5112 if (err < 0) 5113 goto out_addrlabel; 5114 5115 /* The addrconf netdev notifier requires that loopback_dev 5116 * has it's ipv6 private information allocated and setup 5117 * before it can bring up and give link-local addresses 5118 * to other devices which are up. 5119 * 5120 * Unfortunately, loopback_dev is not necessarily the first 5121 * entry in the global dev_base list of net devices. In fact, 5122 * it is likely to be the very last entry on that list. 5123 * So this causes the notifier registry below to try and 5124 * give link-local addresses to all devices besides loopback_dev 5125 * first, then loopback_dev, which cases all the non-loopback_dev 5126 * devices to fail to get a link-local address. 5127 * 5128 * So, as a temporary fix, allocate the ipv6 structure for 5129 * loopback_dev first by hand. 5130 * Longer term, all of the dependencies ipv6 has upon the loopback 5131 * device and it being up should be removed. 5132 */ 5133 rtnl_lock(); 5134 if (!ipv6_add_dev(init_net.loopback_dev)) 5135 err = -ENOMEM; 5136 rtnl_unlock(); 5137 if (err) 5138 goto errlo; 5139 5140 for (i = 0; i < IN6_ADDR_HSIZE; i++) 5141 INIT_HLIST_HEAD(&inet6_addr_lst[i]); 5142 5143 register_netdevice_notifier(&ipv6_dev_notf); 5144 5145 addrconf_verify(0); 5146 5147 err = rtnl_af_register(&inet6_ops); 5148 if (err < 0) 5149 goto errout_af; 5150 5151 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo, 5152 NULL); 5153 if (err < 0) 5154 goto errout; 5155 5156 /* Only the first call to __rtnl_register can fail */ 5157 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL, NULL); 5158 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL, NULL); 5159 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr, 5160 inet6_dump_ifaddr, NULL); 5161 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL, 5162 inet6_dump_ifmcaddr, NULL); 5163 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL, 5164 inet6_dump_ifacaddr, NULL); 5165 __rtnl_register(PF_INET6, RTM_GETNETCONF, inet6_netconf_get_devconf, 5166 inet6_netconf_dump_devconf, NULL); 5167 5168 ipv6_addr_label_rtnl_register(); 5169 5170 return 0; 5171 errout: 5172 rtnl_af_unregister(&inet6_ops); 5173 errout_af: 5174 unregister_netdevice_notifier(&ipv6_dev_notf); 5175 errlo: 5176 unregister_pernet_subsys(&addrconf_ops); 5177 out_addrlabel: 5178 ipv6_addr_label_cleanup(); 5179 out: 5180 return err; 5181 } 5182 5183 void addrconf_cleanup(void) 5184 { 5185 struct net_device *dev; 5186 int i; 5187 5188 unregister_netdevice_notifier(&ipv6_dev_notf); 5189 unregister_pernet_subsys(&addrconf_ops); 5190 ipv6_addr_label_cleanup(); 5191 5192 rtnl_lock(); 5193 5194 __rtnl_af_unregister(&inet6_ops); 5195 5196 /* clean dev list */ 5197 for_each_netdev(&init_net, dev) { 5198 if (__in6_dev_get(dev) == NULL) 5199 continue; 5200 addrconf_ifdown(dev, 1); 5201 } 5202 addrconf_ifdown(init_net.loopback_dev, 2); 5203 5204 /* 5205 * Check hash table. 5206 */ 5207 spin_lock_bh(&addrconf_hash_lock); 5208 for (i = 0; i < IN6_ADDR_HSIZE; i++) 5209 WARN_ON(!hlist_empty(&inet6_addr_lst[i])); 5210 spin_unlock_bh(&addrconf_hash_lock); 5211 5212 del_timer(&addr_chk_timer); 5213 rtnl_unlock(); 5214 } 5215