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_rs_timer(struct inet6_dev *idev) 257 { 258 if (del_timer(&idev->rs_timer)) 259 __in6_dev_put(idev); 260 } 261 262 static void addrconf_del_dad_timer(struct inet6_ifaddr *ifp) 263 { 264 if (del_timer(&ifp->dad_timer)) 265 __in6_ifa_put(ifp); 266 } 267 268 static void addrconf_mod_rs_timer(struct inet6_dev *idev, 269 unsigned long when) 270 { 271 if (!timer_pending(&idev->rs_timer)) 272 in6_dev_hold(idev); 273 mod_timer(&idev->rs_timer, jiffies + when); 274 } 275 276 static void addrconf_mod_dad_timer(struct inet6_ifaddr *ifp, 277 unsigned long when) 278 { 279 if (!timer_pending(&ifp->dad_timer)) 280 in6_ifa_hold(ifp); 281 mod_timer(&ifp->dad_timer, jiffies + when); 282 } 283 284 static int snmp6_alloc_dev(struct inet6_dev *idev) 285 { 286 if (snmp_mib_init((void __percpu **)idev->stats.ipv6, 287 sizeof(struct ipstats_mib), 288 __alignof__(struct ipstats_mib)) < 0) 289 goto err_ip; 290 idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device), 291 GFP_KERNEL); 292 if (!idev->stats.icmpv6dev) 293 goto err_icmp; 294 idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device), 295 GFP_KERNEL); 296 if (!idev->stats.icmpv6msgdev) 297 goto err_icmpmsg; 298 299 return 0; 300 301 err_icmpmsg: 302 kfree(idev->stats.icmpv6dev); 303 err_icmp: 304 snmp_mib_free((void __percpu **)idev->stats.ipv6); 305 err_ip: 306 return -ENOMEM; 307 } 308 309 static void snmp6_free_dev(struct inet6_dev *idev) 310 { 311 kfree(idev->stats.icmpv6msgdev); 312 kfree(idev->stats.icmpv6dev); 313 snmp_mib_free((void __percpu **)idev->stats.ipv6); 314 } 315 316 /* Nobody refers to this device, we may destroy it. */ 317 318 void in6_dev_finish_destroy(struct inet6_dev *idev) 319 { 320 struct net_device *dev = idev->dev; 321 322 WARN_ON(!list_empty(&idev->addr_list)); 323 WARN_ON(idev->mc_list != NULL); 324 WARN_ON(timer_pending(&idev->rs_timer)); 325 326 #ifdef NET_REFCNT_DEBUG 327 pr_debug("%s: %s\n", __func__, dev ? dev->name : "NIL"); 328 #endif 329 dev_put(dev); 330 if (!idev->dead) { 331 pr_warn("Freeing alive inet6 device %p\n", idev); 332 return; 333 } 334 snmp6_free_dev(idev); 335 kfree_rcu(idev, rcu); 336 } 337 EXPORT_SYMBOL(in6_dev_finish_destroy); 338 339 static struct inet6_dev *ipv6_add_dev(struct net_device *dev) 340 { 341 struct inet6_dev *ndev; 342 343 ASSERT_RTNL(); 344 345 if (dev->mtu < IPV6_MIN_MTU) 346 return NULL; 347 348 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL); 349 350 if (ndev == NULL) 351 return NULL; 352 353 rwlock_init(&ndev->lock); 354 ndev->dev = dev; 355 INIT_LIST_HEAD(&ndev->addr_list); 356 setup_timer(&ndev->rs_timer, addrconf_rs_timer, 357 (unsigned long)ndev); 358 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf)); 359 ndev->cnf.mtu6 = dev->mtu; 360 ndev->cnf.sysctl = NULL; 361 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl); 362 if (ndev->nd_parms == NULL) { 363 kfree(ndev); 364 return NULL; 365 } 366 if (ndev->cnf.forwarding) 367 dev_disable_lro(dev); 368 /* We refer to the device */ 369 dev_hold(dev); 370 371 if (snmp6_alloc_dev(ndev) < 0) { 372 ADBG((KERN_WARNING 373 "%s: cannot allocate memory for statistics; dev=%s.\n", 374 __func__, dev->name)); 375 neigh_parms_release(&nd_tbl, ndev->nd_parms); 376 dev_put(dev); 377 kfree(ndev); 378 return NULL; 379 } 380 381 if (snmp6_register_dev(ndev) < 0) { 382 ADBG((KERN_WARNING 383 "%s: cannot create /proc/net/dev_snmp6/%s\n", 384 __func__, dev->name)); 385 neigh_parms_release(&nd_tbl, ndev->nd_parms); 386 ndev->dead = 1; 387 in6_dev_finish_destroy(ndev); 388 return NULL; 389 } 390 391 /* One reference from device. We must do this before 392 * we invoke __ipv6_regen_rndid(). 393 */ 394 in6_dev_hold(ndev); 395 396 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK)) 397 ndev->cnf.accept_dad = -1; 398 399 #if IS_ENABLED(CONFIG_IPV6_SIT) 400 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) { 401 pr_info("%s: Disabled Multicast RS\n", dev->name); 402 ndev->cnf.rtr_solicits = 0; 403 } 404 #endif 405 406 #ifdef CONFIG_IPV6_PRIVACY 407 INIT_LIST_HEAD(&ndev->tempaddr_list); 408 setup_timer(&ndev->regen_timer, ipv6_regen_rndid, (unsigned long)ndev); 409 if ((dev->flags&IFF_LOOPBACK) || 410 dev->type == ARPHRD_TUNNEL || 411 dev->type == ARPHRD_TUNNEL6 || 412 dev->type == ARPHRD_SIT || 413 dev->type == ARPHRD_NONE) { 414 ndev->cnf.use_tempaddr = -1; 415 } else { 416 in6_dev_hold(ndev); 417 ipv6_regen_rndid((unsigned long) ndev); 418 } 419 #endif 420 ndev->token = in6addr_any; 421 422 if (netif_running(dev) && addrconf_qdisc_ok(dev)) 423 ndev->if_flags |= IF_READY; 424 425 ipv6_mc_init_dev(ndev); 426 ndev->tstamp = jiffies; 427 addrconf_sysctl_register(ndev); 428 /* protected by rtnl_lock */ 429 rcu_assign_pointer(dev->ip6_ptr, ndev); 430 431 /* Join interface-local all-node multicast group */ 432 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allnodes); 433 434 /* Join all-node multicast group */ 435 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes); 436 437 /* Join all-router multicast group if forwarding is set */ 438 if (ndev->cnf.forwarding && (dev->flags & IFF_MULTICAST)) 439 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters); 440 441 return ndev; 442 } 443 444 static struct inet6_dev *ipv6_find_idev(struct net_device *dev) 445 { 446 struct inet6_dev *idev; 447 448 ASSERT_RTNL(); 449 450 idev = __in6_dev_get(dev); 451 if (!idev) { 452 idev = ipv6_add_dev(dev); 453 if (!idev) 454 return NULL; 455 } 456 457 if (dev->flags&IFF_UP) 458 ipv6_mc_up(idev); 459 return idev; 460 } 461 462 static int inet6_netconf_msgsize_devconf(int type) 463 { 464 int size = NLMSG_ALIGN(sizeof(struct netconfmsg)) 465 + nla_total_size(4); /* NETCONFA_IFINDEX */ 466 467 /* type -1 is used for ALL */ 468 if (type == -1 || type == NETCONFA_FORWARDING) 469 size += nla_total_size(4); 470 #ifdef CONFIG_IPV6_MROUTE 471 if (type == -1 || type == NETCONFA_MC_FORWARDING) 472 size += nla_total_size(4); 473 #endif 474 475 return size; 476 } 477 478 static int inet6_netconf_fill_devconf(struct sk_buff *skb, int ifindex, 479 struct ipv6_devconf *devconf, u32 portid, 480 u32 seq, int event, unsigned int flags, 481 int type) 482 { 483 struct nlmsghdr *nlh; 484 struct netconfmsg *ncm; 485 486 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg), 487 flags); 488 if (nlh == NULL) 489 return -EMSGSIZE; 490 491 ncm = nlmsg_data(nlh); 492 ncm->ncm_family = AF_INET6; 493 494 if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0) 495 goto nla_put_failure; 496 497 /* type -1 is used for ALL */ 498 if ((type == -1 || type == NETCONFA_FORWARDING) && 499 nla_put_s32(skb, NETCONFA_FORWARDING, devconf->forwarding) < 0) 500 goto nla_put_failure; 501 #ifdef CONFIG_IPV6_MROUTE 502 if ((type == -1 || type == NETCONFA_MC_FORWARDING) && 503 nla_put_s32(skb, NETCONFA_MC_FORWARDING, 504 devconf->mc_forwarding) < 0) 505 goto nla_put_failure; 506 #endif 507 return nlmsg_end(skb, nlh); 508 509 nla_put_failure: 510 nlmsg_cancel(skb, nlh); 511 return -EMSGSIZE; 512 } 513 514 void inet6_netconf_notify_devconf(struct net *net, int type, int ifindex, 515 struct ipv6_devconf *devconf) 516 { 517 struct sk_buff *skb; 518 int err = -ENOBUFS; 519 520 skb = nlmsg_new(inet6_netconf_msgsize_devconf(type), GFP_ATOMIC); 521 if (skb == NULL) 522 goto errout; 523 524 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 0, 0, 525 RTM_NEWNETCONF, 0, type); 526 if (err < 0) { 527 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */ 528 WARN_ON(err == -EMSGSIZE); 529 kfree_skb(skb); 530 goto errout; 531 } 532 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_NETCONF, NULL, GFP_ATOMIC); 533 return; 534 errout: 535 rtnl_set_sk_err(net, RTNLGRP_IPV6_NETCONF, err); 536 } 537 538 static const struct nla_policy devconf_ipv6_policy[NETCONFA_MAX+1] = { 539 [NETCONFA_IFINDEX] = { .len = sizeof(int) }, 540 [NETCONFA_FORWARDING] = { .len = sizeof(int) }, 541 }; 542 543 static int inet6_netconf_get_devconf(struct sk_buff *in_skb, 544 struct nlmsghdr *nlh) 545 { 546 struct net *net = sock_net(in_skb->sk); 547 struct nlattr *tb[NETCONFA_MAX+1]; 548 struct netconfmsg *ncm; 549 struct sk_buff *skb; 550 struct ipv6_devconf *devconf; 551 struct inet6_dev *in6_dev; 552 struct net_device *dev; 553 int ifindex; 554 int err; 555 556 err = nlmsg_parse(nlh, sizeof(*ncm), tb, NETCONFA_MAX, 557 devconf_ipv6_policy); 558 if (err < 0) 559 goto errout; 560 561 err = EINVAL; 562 if (!tb[NETCONFA_IFINDEX]) 563 goto errout; 564 565 ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]); 566 switch (ifindex) { 567 case NETCONFA_IFINDEX_ALL: 568 devconf = net->ipv6.devconf_all; 569 break; 570 case NETCONFA_IFINDEX_DEFAULT: 571 devconf = net->ipv6.devconf_dflt; 572 break; 573 default: 574 dev = __dev_get_by_index(net, ifindex); 575 if (dev == NULL) 576 goto errout; 577 in6_dev = __in6_dev_get(dev); 578 if (in6_dev == NULL) 579 goto errout; 580 devconf = &in6_dev->cnf; 581 break; 582 } 583 584 err = -ENOBUFS; 585 skb = nlmsg_new(inet6_netconf_msgsize_devconf(-1), GFP_ATOMIC); 586 if (skb == NULL) 587 goto errout; 588 589 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 590 NETLINK_CB(in_skb).portid, 591 nlh->nlmsg_seq, RTM_NEWNETCONF, 0, 592 -1); 593 if (err < 0) { 594 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */ 595 WARN_ON(err == -EMSGSIZE); 596 kfree_skb(skb); 597 goto errout; 598 } 599 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid); 600 errout: 601 return err; 602 } 603 604 static int inet6_netconf_dump_devconf(struct sk_buff *skb, 605 struct netlink_callback *cb) 606 { 607 struct net *net = sock_net(skb->sk); 608 int h, s_h; 609 int idx, s_idx; 610 struct net_device *dev; 611 struct inet6_dev *idev; 612 struct hlist_head *head; 613 614 s_h = cb->args[0]; 615 s_idx = idx = cb->args[1]; 616 617 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 618 idx = 0; 619 head = &net->dev_index_head[h]; 620 rcu_read_lock(); 621 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ 622 net->dev_base_seq; 623 hlist_for_each_entry_rcu(dev, head, index_hlist) { 624 if (idx < s_idx) 625 goto cont; 626 idev = __in6_dev_get(dev); 627 if (!idev) 628 goto cont; 629 630 if (inet6_netconf_fill_devconf(skb, dev->ifindex, 631 &idev->cnf, 632 NETLINK_CB(cb->skb).portid, 633 cb->nlh->nlmsg_seq, 634 RTM_NEWNETCONF, 635 NLM_F_MULTI, 636 -1) <= 0) { 637 rcu_read_unlock(); 638 goto done; 639 } 640 nl_dump_check_consistent(cb, nlmsg_hdr(skb)); 641 cont: 642 idx++; 643 } 644 rcu_read_unlock(); 645 } 646 if (h == NETDEV_HASHENTRIES) { 647 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL, 648 net->ipv6.devconf_all, 649 NETLINK_CB(cb->skb).portid, 650 cb->nlh->nlmsg_seq, 651 RTM_NEWNETCONF, NLM_F_MULTI, 652 -1) <= 0) 653 goto done; 654 else 655 h++; 656 } 657 if (h == NETDEV_HASHENTRIES + 1) { 658 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT, 659 net->ipv6.devconf_dflt, 660 NETLINK_CB(cb->skb).portid, 661 cb->nlh->nlmsg_seq, 662 RTM_NEWNETCONF, NLM_F_MULTI, 663 -1) <= 0) 664 goto done; 665 else 666 h++; 667 } 668 done: 669 cb->args[0] = h; 670 cb->args[1] = idx; 671 672 return skb->len; 673 } 674 675 #ifdef CONFIG_SYSCTL 676 static void dev_forward_change(struct inet6_dev *idev) 677 { 678 struct net_device *dev; 679 struct inet6_ifaddr *ifa; 680 681 if (!idev) 682 return; 683 dev = idev->dev; 684 if (idev->cnf.forwarding) 685 dev_disable_lro(dev); 686 if (dev->flags & IFF_MULTICAST) { 687 if (idev->cnf.forwarding) { 688 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters); 689 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allrouters); 690 ipv6_dev_mc_inc(dev, &in6addr_sitelocal_allrouters); 691 } else { 692 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters); 693 ipv6_dev_mc_dec(dev, &in6addr_interfacelocal_allrouters); 694 ipv6_dev_mc_dec(dev, &in6addr_sitelocal_allrouters); 695 } 696 } 697 698 list_for_each_entry(ifa, &idev->addr_list, if_list) { 699 if (ifa->flags&IFA_F_TENTATIVE) 700 continue; 701 if (idev->cnf.forwarding) 702 addrconf_join_anycast(ifa); 703 else 704 addrconf_leave_anycast(ifa); 705 } 706 inet6_netconf_notify_devconf(dev_net(dev), NETCONFA_FORWARDING, 707 dev->ifindex, &idev->cnf); 708 } 709 710 711 static void addrconf_forward_change(struct net *net, __s32 newf) 712 { 713 struct net_device *dev; 714 struct inet6_dev *idev; 715 716 for_each_netdev(net, dev) { 717 idev = __in6_dev_get(dev); 718 if (idev) { 719 int changed = (!idev->cnf.forwarding) ^ (!newf); 720 idev->cnf.forwarding = newf; 721 if (changed) 722 dev_forward_change(idev); 723 } 724 } 725 } 726 727 static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf) 728 { 729 struct net *net; 730 int old; 731 732 if (!rtnl_trylock()) 733 return restart_syscall(); 734 735 net = (struct net *)table->extra2; 736 old = *p; 737 *p = newf; 738 739 if (p == &net->ipv6.devconf_dflt->forwarding) { 740 if ((!newf) ^ (!old)) 741 inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING, 742 NETCONFA_IFINDEX_DEFAULT, 743 net->ipv6.devconf_dflt); 744 rtnl_unlock(); 745 return 0; 746 } 747 748 if (p == &net->ipv6.devconf_all->forwarding) { 749 net->ipv6.devconf_dflt->forwarding = newf; 750 addrconf_forward_change(net, newf); 751 if ((!newf) ^ (!old)) 752 inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING, 753 NETCONFA_IFINDEX_ALL, 754 net->ipv6.devconf_all); 755 } else if ((!newf) ^ (!old)) 756 dev_forward_change((struct inet6_dev *)table->extra1); 757 rtnl_unlock(); 758 759 if (newf) 760 rt6_purge_dflt_routers(net); 761 return 1; 762 } 763 #endif 764 765 /* Nobody refers to this ifaddr, destroy it */ 766 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp) 767 { 768 WARN_ON(!hlist_unhashed(&ifp->addr_lst)); 769 770 #ifdef NET_REFCNT_DEBUG 771 pr_debug("%s\n", __func__); 772 #endif 773 774 in6_dev_put(ifp->idev); 775 776 if (del_timer(&ifp->dad_timer)) 777 pr_notice("Timer is still running, when freeing ifa=%p\n", ifp); 778 779 if (ifp->state != INET6_IFADDR_STATE_DEAD) { 780 pr_warn("Freeing alive inet6 address %p\n", ifp); 781 return; 782 } 783 ip6_rt_put(ifp->rt); 784 785 kfree_rcu(ifp, rcu); 786 } 787 788 static void 789 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp) 790 { 791 struct list_head *p; 792 int ifp_scope = ipv6_addr_src_scope(&ifp->addr); 793 794 /* 795 * Each device address list is sorted in order of scope - 796 * global before linklocal. 797 */ 798 list_for_each(p, &idev->addr_list) { 799 struct inet6_ifaddr *ifa 800 = list_entry(p, struct inet6_ifaddr, if_list); 801 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr)) 802 break; 803 } 804 805 list_add_tail(&ifp->if_list, p); 806 } 807 808 static u32 inet6_addr_hash(const struct in6_addr *addr) 809 { 810 return hash_32(ipv6_addr_hash(addr), IN6_ADDR_HSIZE_SHIFT); 811 } 812 813 /* On success it returns ifp with increased reference count */ 814 815 static struct inet6_ifaddr * 816 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, int pfxlen, 817 int scope, u32 flags) 818 { 819 struct inet6_ifaddr *ifa = NULL; 820 struct rt6_info *rt; 821 unsigned int hash; 822 int err = 0; 823 int addr_type = ipv6_addr_type(addr); 824 825 if (addr_type == IPV6_ADDR_ANY || 826 addr_type & IPV6_ADDR_MULTICAST || 827 (!(idev->dev->flags & IFF_LOOPBACK) && 828 addr_type & IPV6_ADDR_LOOPBACK)) 829 return ERR_PTR(-EADDRNOTAVAIL); 830 831 rcu_read_lock_bh(); 832 if (idev->dead) { 833 err = -ENODEV; /*XXX*/ 834 goto out2; 835 } 836 837 if (idev->cnf.disable_ipv6) { 838 err = -EACCES; 839 goto out2; 840 } 841 842 spin_lock(&addrconf_hash_lock); 843 844 /* Ignore adding duplicate addresses on an interface */ 845 if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) { 846 ADBG(("ipv6_add_addr: already assigned\n")); 847 err = -EEXIST; 848 goto out; 849 } 850 851 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC); 852 853 if (ifa == NULL) { 854 ADBG(("ipv6_add_addr: malloc failed\n")); 855 err = -ENOBUFS; 856 goto out; 857 } 858 859 rt = addrconf_dst_alloc(idev, addr, false); 860 if (IS_ERR(rt)) { 861 err = PTR_ERR(rt); 862 goto out; 863 } 864 865 ifa->addr = *addr; 866 867 spin_lock_init(&ifa->lock); 868 spin_lock_init(&ifa->state_lock); 869 setup_timer(&ifa->dad_timer, addrconf_dad_timer, 870 (unsigned long)ifa); 871 INIT_HLIST_NODE(&ifa->addr_lst); 872 ifa->scope = scope; 873 ifa->prefix_len = pfxlen; 874 ifa->flags = flags | IFA_F_TENTATIVE; 875 ifa->cstamp = ifa->tstamp = jiffies; 876 ifa->tokenized = false; 877 878 ifa->rt = rt; 879 880 ifa->idev = idev; 881 in6_dev_hold(idev); 882 /* For caller */ 883 in6_ifa_hold(ifa); 884 885 /* Add to big hash table */ 886 hash = inet6_addr_hash(addr); 887 888 hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]); 889 spin_unlock(&addrconf_hash_lock); 890 891 write_lock(&idev->lock); 892 /* Add to inet6_dev unicast addr list. */ 893 ipv6_link_dev_addr(idev, ifa); 894 895 #ifdef CONFIG_IPV6_PRIVACY 896 if (ifa->flags&IFA_F_TEMPORARY) { 897 list_add(&ifa->tmp_list, &idev->tempaddr_list); 898 in6_ifa_hold(ifa); 899 } 900 #endif 901 902 in6_ifa_hold(ifa); 903 write_unlock(&idev->lock); 904 out2: 905 rcu_read_unlock_bh(); 906 907 if (likely(err == 0)) 908 inet6addr_notifier_call_chain(NETDEV_UP, ifa); 909 else { 910 kfree(ifa); 911 ifa = ERR_PTR(err); 912 } 913 914 return ifa; 915 out: 916 spin_unlock(&addrconf_hash_lock); 917 goto out2; 918 } 919 920 /* This function wants to get referenced ifp and releases it before return */ 921 922 static void ipv6_del_addr(struct inet6_ifaddr *ifp) 923 { 924 struct inet6_ifaddr *ifa, *ifn; 925 struct inet6_dev *idev = ifp->idev; 926 int state; 927 int deleted = 0, onlink = 0; 928 unsigned long expires = jiffies; 929 930 spin_lock_bh(&ifp->state_lock); 931 state = ifp->state; 932 ifp->state = INET6_IFADDR_STATE_DEAD; 933 spin_unlock_bh(&ifp->state_lock); 934 935 if (state == INET6_IFADDR_STATE_DEAD) 936 goto out; 937 938 spin_lock_bh(&addrconf_hash_lock); 939 hlist_del_init_rcu(&ifp->addr_lst); 940 spin_unlock_bh(&addrconf_hash_lock); 941 942 write_lock_bh(&idev->lock); 943 #ifdef CONFIG_IPV6_PRIVACY 944 if (ifp->flags&IFA_F_TEMPORARY) { 945 list_del(&ifp->tmp_list); 946 if (ifp->ifpub) { 947 in6_ifa_put(ifp->ifpub); 948 ifp->ifpub = NULL; 949 } 950 __in6_ifa_put(ifp); 951 } 952 #endif 953 954 list_for_each_entry_safe(ifa, ifn, &idev->addr_list, if_list) { 955 if (ifa == ifp) { 956 list_del_init(&ifp->if_list); 957 __in6_ifa_put(ifp); 958 959 if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0) 960 break; 961 deleted = 1; 962 continue; 963 } else if (ifp->flags & IFA_F_PERMANENT) { 964 if (ipv6_prefix_equal(&ifa->addr, &ifp->addr, 965 ifp->prefix_len)) { 966 if (ifa->flags & IFA_F_PERMANENT) { 967 onlink = 1; 968 if (deleted) 969 break; 970 } else { 971 unsigned long lifetime; 972 973 if (!onlink) 974 onlink = -1; 975 976 spin_lock(&ifa->lock); 977 978 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ); 979 /* 980 * Note: Because this address is 981 * not permanent, lifetime < 982 * LONG_MAX / HZ here. 983 */ 984 if (time_before(expires, 985 ifa->tstamp + lifetime * HZ)) 986 expires = ifa->tstamp + lifetime * HZ; 987 spin_unlock(&ifa->lock); 988 } 989 } 990 } 991 } 992 write_unlock_bh(&idev->lock); 993 994 addrconf_del_dad_timer(ifp); 995 996 ipv6_ifa_notify(RTM_DELADDR, ifp); 997 998 inet6addr_notifier_call_chain(NETDEV_DOWN, ifp); 999 1000 /* 1001 * Purge or update corresponding prefix 1002 * 1003 * 1) we don't purge prefix here if address was not permanent. 1004 * prefix is managed by its own lifetime. 1005 * 2) if there're no addresses, delete prefix. 1006 * 3) if there're still other permanent address(es), 1007 * corresponding prefix is still permanent. 1008 * 4) otherwise, update prefix lifetime to the 1009 * longest valid lifetime among the corresponding 1010 * addresses on the device. 1011 * Note: subsequent RA will update lifetime. 1012 * 1013 * --yoshfuji 1014 */ 1015 if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) { 1016 struct in6_addr prefix; 1017 struct rt6_info *rt; 1018 1019 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len); 1020 1021 rt = addrconf_get_prefix_route(&prefix, 1022 ifp->prefix_len, 1023 ifp->idev->dev, 1024 0, RTF_GATEWAY | RTF_DEFAULT); 1025 1026 if (rt) { 1027 if (onlink == 0) { 1028 ip6_del_rt(rt); 1029 rt = NULL; 1030 } else if (!(rt->rt6i_flags & RTF_EXPIRES)) { 1031 rt6_set_expires(rt, expires); 1032 } 1033 } 1034 ip6_rt_put(rt); 1035 } 1036 1037 /* clean up prefsrc entries */ 1038 rt6_remove_prefsrc(ifp); 1039 out: 1040 in6_ifa_put(ifp); 1041 } 1042 1043 #ifdef CONFIG_IPV6_PRIVACY 1044 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift) 1045 { 1046 struct inet6_dev *idev = ifp->idev; 1047 struct in6_addr addr, *tmpaddr; 1048 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_tstamp, age; 1049 unsigned long regen_advance; 1050 int tmp_plen; 1051 int ret = 0; 1052 int max_addresses; 1053 u32 addr_flags; 1054 unsigned long now = jiffies; 1055 1056 write_lock(&idev->lock); 1057 if (ift) { 1058 spin_lock_bh(&ift->lock); 1059 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8); 1060 spin_unlock_bh(&ift->lock); 1061 tmpaddr = &addr; 1062 } else { 1063 tmpaddr = NULL; 1064 } 1065 retry: 1066 in6_dev_hold(idev); 1067 if (idev->cnf.use_tempaddr <= 0) { 1068 write_unlock(&idev->lock); 1069 pr_info("%s: use_tempaddr is disabled\n", __func__); 1070 in6_dev_put(idev); 1071 ret = -1; 1072 goto out; 1073 } 1074 spin_lock_bh(&ifp->lock); 1075 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) { 1076 idev->cnf.use_tempaddr = -1; /*XXX*/ 1077 spin_unlock_bh(&ifp->lock); 1078 write_unlock(&idev->lock); 1079 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n", 1080 __func__); 1081 in6_dev_put(idev); 1082 ret = -1; 1083 goto out; 1084 } 1085 in6_ifa_hold(ifp); 1086 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8); 1087 __ipv6_try_regen_rndid(idev, tmpaddr); 1088 memcpy(&addr.s6_addr[8], idev->rndid, 8); 1089 age = (now - ifp->tstamp) / HZ; 1090 tmp_valid_lft = min_t(__u32, 1091 ifp->valid_lft, 1092 idev->cnf.temp_valid_lft + age); 1093 tmp_prefered_lft = min_t(__u32, 1094 ifp->prefered_lft, 1095 idev->cnf.temp_prefered_lft + age - 1096 idev->cnf.max_desync_factor); 1097 tmp_plen = ifp->prefix_len; 1098 max_addresses = idev->cnf.max_addresses; 1099 tmp_tstamp = ifp->tstamp; 1100 spin_unlock_bh(&ifp->lock); 1101 1102 regen_advance = idev->cnf.regen_max_retry * 1103 idev->cnf.dad_transmits * 1104 idev->nd_parms->retrans_time / HZ; 1105 write_unlock(&idev->lock); 1106 1107 /* A temporary address is created only if this calculated Preferred 1108 * Lifetime is greater than REGEN_ADVANCE time units. In particular, 1109 * an implementation must not create a temporary address with a zero 1110 * Preferred Lifetime. 1111 */ 1112 if (tmp_prefered_lft <= regen_advance) { 1113 in6_ifa_put(ifp); 1114 in6_dev_put(idev); 1115 ret = -1; 1116 goto out; 1117 } 1118 1119 addr_flags = IFA_F_TEMPORARY; 1120 /* set in addrconf_prefix_rcv() */ 1121 if (ifp->flags & IFA_F_OPTIMISTIC) 1122 addr_flags |= IFA_F_OPTIMISTIC; 1123 1124 ift = !max_addresses || 1125 ipv6_count_addresses(idev) < max_addresses ? 1126 ipv6_add_addr(idev, &addr, tmp_plen, ipv6_addr_scope(&addr), 1127 addr_flags) : NULL; 1128 if (IS_ERR_OR_NULL(ift)) { 1129 in6_ifa_put(ifp); 1130 in6_dev_put(idev); 1131 pr_info("%s: retry temporary address regeneration\n", __func__); 1132 tmpaddr = &addr; 1133 write_lock(&idev->lock); 1134 goto retry; 1135 } 1136 1137 spin_lock_bh(&ift->lock); 1138 ift->ifpub = ifp; 1139 ift->valid_lft = tmp_valid_lft; 1140 ift->prefered_lft = tmp_prefered_lft; 1141 ift->cstamp = now; 1142 ift->tstamp = tmp_tstamp; 1143 spin_unlock_bh(&ift->lock); 1144 1145 addrconf_dad_start(ift); 1146 in6_ifa_put(ift); 1147 in6_dev_put(idev); 1148 out: 1149 return ret; 1150 } 1151 #endif 1152 1153 /* 1154 * Choose an appropriate source address (RFC3484) 1155 */ 1156 enum { 1157 IPV6_SADDR_RULE_INIT = 0, 1158 IPV6_SADDR_RULE_LOCAL, 1159 IPV6_SADDR_RULE_SCOPE, 1160 IPV6_SADDR_RULE_PREFERRED, 1161 #ifdef CONFIG_IPV6_MIP6 1162 IPV6_SADDR_RULE_HOA, 1163 #endif 1164 IPV6_SADDR_RULE_OIF, 1165 IPV6_SADDR_RULE_LABEL, 1166 #ifdef CONFIG_IPV6_PRIVACY 1167 IPV6_SADDR_RULE_PRIVACY, 1168 #endif 1169 IPV6_SADDR_RULE_ORCHID, 1170 IPV6_SADDR_RULE_PREFIX, 1171 IPV6_SADDR_RULE_MAX 1172 }; 1173 1174 struct ipv6_saddr_score { 1175 int rule; 1176 int addr_type; 1177 struct inet6_ifaddr *ifa; 1178 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX); 1179 int scopedist; 1180 int matchlen; 1181 }; 1182 1183 struct ipv6_saddr_dst { 1184 const struct in6_addr *addr; 1185 int ifindex; 1186 int scope; 1187 int label; 1188 unsigned int prefs; 1189 }; 1190 1191 static inline int ipv6_saddr_preferred(int type) 1192 { 1193 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK)) 1194 return 1; 1195 return 0; 1196 } 1197 1198 static int ipv6_get_saddr_eval(struct net *net, 1199 struct ipv6_saddr_score *score, 1200 struct ipv6_saddr_dst *dst, 1201 int i) 1202 { 1203 int ret; 1204 1205 if (i <= score->rule) { 1206 switch (i) { 1207 case IPV6_SADDR_RULE_SCOPE: 1208 ret = score->scopedist; 1209 break; 1210 case IPV6_SADDR_RULE_PREFIX: 1211 ret = score->matchlen; 1212 break; 1213 default: 1214 ret = !!test_bit(i, score->scorebits); 1215 } 1216 goto out; 1217 } 1218 1219 switch (i) { 1220 case IPV6_SADDR_RULE_INIT: 1221 /* Rule 0: remember if hiscore is not ready yet */ 1222 ret = !!score->ifa; 1223 break; 1224 case IPV6_SADDR_RULE_LOCAL: 1225 /* Rule 1: Prefer same address */ 1226 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr); 1227 break; 1228 case IPV6_SADDR_RULE_SCOPE: 1229 /* Rule 2: Prefer appropriate scope 1230 * 1231 * ret 1232 * ^ 1233 * -1 | d 15 1234 * ---+--+-+---> scope 1235 * | 1236 * | d is scope of the destination. 1237 * B-d | \ 1238 * | \ <- smaller scope is better if 1239 * B-15 | \ if scope is enough for destinaion. 1240 * | ret = B - scope (-1 <= scope >= d <= 15). 1241 * d-C-1 | / 1242 * |/ <- greater is better 1243 * -C / if scope is not enough for destination. 1244 * /| ret = scope - C (-1 <= d < scope <= 15). 1245 * 1246 * d - C - 1 < B -15 (for all -1 <= d <= 15). 1247 * C > d + 14 - B >= 15 + 14 - B = 29 - B. 1248 * Assume B = 0 and we get C > 29. 1249 */ 1250 ret = __ipv6_addr_src_scope(score->addr_type); 1251 if (ret >= dst->scope) 1252 ret = -ret; 1253 else 1254 ret -= 128; /* 30 is enough */ 1255 score->scopedist = ret; 1256 break; 1257 case IPV6_SADDR_RULE_PREFERRED: 1258 /* Rule 3: Avoid deprecated and optimistic addresses */ 1259 ret = ipv6_saddr_preferred(score->addr_type) || 1260 !(score->ifa->flags & (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC)); 1261 break; 1262 #ifdef CONFIG_IPV6_MIP6 1263 case IPV6_SADDR_RULE_HOA: 1264 { 1265 /* Rule 4: Prefer home address */ 1266 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA); 1267 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome; 1268 break; 1269 } 1270 #endif 1271 case IPV6_SADDR_RULE_OIF: 1272 /* Rule 5: Prefer outgoing interface */ 1273 ret = (!dst->ifindex || 1274 dst->ifindex == score->ifa->idev->dev->ifindex); 1275 break; 1276 case IPV6_SADDR_RULE_LABEL: 1277 /* Rule 6: Prefer matching label */ 1278 ret = ipv6_addr_label(net, 1279 &score->ifa->addr, score->addr_type, 1280 score->ifa->idev->dev->ifindex) == dst->label; 1281 break; 1282 #ifdef CONFIG_IPV6_PRIVACY 1283 case IPV6_SADDR_RULE_PRIVACY: 1284 { 1285 /* Rule 7: Prefer public address 1286 * Note: prefer temporary address if use_tempaddr >= 2 1287 */ 1288 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ? 1289 !!(dst->prefs & IPV6_PREFER_SRC_TMP) : 1290 score->ifa->idev->cnf.use_tempaddr >= 2; 1291 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp; 1292 break; 1293 } 1294 #endif 1295 case IPV6_SADDR_RULE_ORCHID: 1296 /* Rule 8-: Prefer ORCHID vs ORCHID or 1297 * non-ORCHID vs non-ORCHID 1298 */ 1299 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^ 1300 ipv6_addr_orchid(dst->addr)); 1301 break; 1302 case IPV6_SADDR_RULE_PREFIX: 1303 /* Rule 8: Use longest matching prefix */ 1304 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr); 1305 if (ret > score->ifa->prefix_len) 1306 ret = score->ifa->prefix_len; 1307 score->matchlen = ret; 1308 break; 1309 default: 1310 ret = 0; 1311 } 1312 1313 if (ret) 1314 __set_bit(i, score->scorebits); 1315 score->rule = i; 1316 out: 1317 return ret; 1318 } 1319 1320 int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev, 1321 const struct in6_addr *daddr, unsigned int prefs, 1322 struct in6_addr *saddr) 1323 { 1324 struct ipv6_saddr_score scores[2], 1325 *score = &scores[0], *hiscore = &scores[1]; 1326 struct ipv6_saddr_dst dst; 1327 struct net_device *dev; 1328 int dst_type; 1329 1330 dst_type = __ipv6_addr_type(daddr); 1331 dst.addr = daddr; 1332 dst.ifindex = dst_dev ? dst_dev->ifindex : 0; 1333 dst.scope = __ipv6_addr_src_scope(dst_type); 1334 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex); 1335 dst.prefs = prefs; 1336 1337 hiscore->rule = -1; 1338 hiscore->ifa = NULL; 1339 1340 rcu_read_lock(); 1341 1342 for_each_netdev_rcu(net, dev) { 1343 struct inet6_dev *idev; 1344 1345 /* Candidate Source Address (section 4) 1346 * - multicast and link-local destination address, 1347 * the set of candidate source address MUST only 1348 * include addresses assigned to interfaces 1349 * belonging to the same link as the outgoing 1350 * interface. 1351 * (- For site-local destination addresses, the 1352 * set of candidate source addresses MUST only 1353 * include addresses assigned to interfaces 1354 * belonging to the same site as the outgoing 1355 * interface.) 1356 */ 1357 if (((dst_type & IPV6_ADDR_MULTICAST) || 1358 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL) && 1359 dst.ifindex && dev->ifindex != dst.ifindex) 1360 continue; 1361 1362 idev = __in6_dev_get(dev); 1363 if (!idev) 1364 continue; 1365 1366 read_lock_bh(&idev->lock); 1367 list_for_each_entry(score->ifa, &idev->addr_list, if_list) { 1368 int i; 1369 1370 /* 1371 * - Tentative Address (RFC2462 section 5.4) 1372 * - A tentative address is not considered 1373 * "assigned to an interface" in the traditional 1374 * sense, unless it is also flagged as optimistic. 1375 * - Candidate Source Address (section 4) 1376 * - In any case, anycast addresses, multicast 1377 * addresses, and the unspecified address MUST 1378 * NOT be included in a candidate set. 1379 */ 1380 if ((score->ifa->flags & IFA_F_TENTATIVE) && 1381 (!(score->ifa->flags & IFA_F_OPTIMISTIC))) 1382 continue; 1383 1384 score->addr_type = __ipv6_addr_type(&score->ifa->addr); 1385 1386 if (unlikely(score->addr_type == IPV6_ADDR_ANY || 1387 score->addr_type & IPV6_ADDR_MULTICAST)) { 1388 LIMIT_NETDEBUG(KERN_DEBUG 1389 "ADDRCONF: unspecified / multicast address " 1390 "assigned as unicast address on %s", 1391 dev->name); 1392 continue; 1393 } 1394 1395 score->rule = -1; 1396 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX); 1397 1398 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) { 1399 int minihiscore, miniscore; 1400 1401 minihiscore = ipv6_get_saddr_eval(net, hiscore, &dst, i); 1402 miniscore = ipv6_get_saddr_eval(net, score, &dst, i); 1403 1404 if (minihiscore > miniscore) { 1405 if (i == IPV6_SADDR_RULE_SCOPE && 1406 score->scopedist > 0) { 1407 /* 1408 * special case: 1409 * each remaining entry 1410 * has too small (not enough) 1411 * scope, because ifa entries 1412 * are sorted by their scope 1413 * values. 1414 */ 1415 goto try_nextdev; 1416 } 1417 break; 1418 } else if (minihiscore < miniscore) { 1419 if (hiscore->ifa) 1420 in6_ifa_put(hiscore->ifa); 1421 1422 in6_ifa_hold(score->ifa); 1423 1424 swap(hiscore, score); 1425 1426 /* restore our iterator */ 1427 score->ifa = hiscore->ifa; 1428 1429 break; 1430 } 1431 } 1432 } 1433 try_nextdev: 1434 read_unlock_bh(&idev->lock); 1435 } 1436 rcu_read_unlock(); 1437 1438 if (!hiscore->ifa) 1439 return -EADDRNOTAVAIL; 1440 1441 *saddr = hiscore->ifa->addr; 1442 in6_ifa_put(hiscore->ifa); 1443 return 0; 1444 } 1445 EXPORT_SYMBOL(ipv6_dev_get_saddr); 1446 1447 int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr, 1448 unsigned char banned_flags) 1449 { 1450 struct inet6_ifaddr *ifp; 1451 int err = -EADDRNOTAVAIL; 1452 1453 list_for_each_entry(ifp, &idev->addr_list, if_list) { 1454 if (ifp->scope == IFA_LINK && 1455 !(ifp->flags & banned_flags)) { 1456 *addr = ifp->addr; 1457 err = 0; 1458 break; 1459 } 1460 } 1461 return err; 1462 } 1463 1464 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr, 1465 unsigned char banned_flags) 1466 { 1467 struct inet6_dev *idev; 1468 int err = -EADDRNOTAVAIL; 1469 1470 rcu_read_lock(); 1471 idev = __in6_dev_get(dev); 1472 if (idev) { 1473 read_lock_bh(&idev->lock); 1474 err = __ipv6_get_lladdr(idev, addr, banned_flags); 1475 read_unlock_bh(&idev->lock); 1476 } 1477 rcu_read_unlock(); 1478 return err; 1479 } 1480 1481 static int ipv6_count_addresses(struct inet6_dev *idev) 1482 { 1483 int cnt = 0; 1484 struct inet6_ifaddr *ifp; 1485 1486 read_lock_bh(&idev->lock); 1487 list_for_each_entry(ifp, &idev->addr_list, if_list) 1488 cnt++; 1489 read_unlock_bh(&idev->lock); 1490 return cnt; 1491 } 1492 1493 int ipv6_chk_addr(struct net *net, const struct in6_addr *addr, 1494 const struct net_device *dev, int strict) 1495 { 1496 struct inet6_ifaddr *ifp; 1497 unsigned int hash = inet6_addr_hash(addr); 1498 1499 rcu_read_lock_bh(); 1500 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) { 1501 if (!net_eq(dev_net(ifp->idev->dev), net)) 1502 continue; 1503 if (ipv6_addr_equal(&ifp->addr, addr) && 1504 !(ifp->flags&IFA_F_TENTATIVE) && 1505 (dev == NULL || ifp->idev->dev == dev || 1506 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) { 1507 rcu_read_unlock_bh(); 1508 return 1; 1509 } 1510 } 1511 1512 rcu_read_unlock_bh(); 1513 return 0; 1514 } 1515 EXPORT_SYMBOL(ipv6_chk_addr); 1516 1517 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr, 1518 struct net_device *dev) 1519 { 1520 unsigned int hash = inet6_addr_hash(addr); 1521 struct inet6_ifaddr *ifp; 1522 1523 hlist_for_each_entry(ifp, &inet6_addr_lst[hash], addr_lst) { 1524 if (!net_eq(dev_net(ifp->idev->dev), net)) 1525 continue; 1526 if (ipv6_addr_equal(&ifp->addr, addr)) { 1527 if (dev == NULL || ifp->idev->dev == dev) 1528 return true; 1529 } 1530 } 1531 return false; 1532 } 1533 1534 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev) 1535 { 1536 struct inet6_dev *idev; 1537 struct inet6_ifaddr *ifa; 1538 int onlink; 1539 1540 onlink = 0; 1541 rcu_read_lock(); 1542 idev = __in6_dev_get(dev); 1543 if (idev) { 1544 read_lock_bh(&idev->lock); 1545 list_for_each_entry(ifa, &idev->addr_list, if_list) { 1546 onlink = ipv6_prefix_equal(addr, &ifa->addr, 1547 ifa->prefix_len); 1548 if (onlink) 1549 break; 1550 } 1551 read_unlock_bh(&idev->lock); 1552 } 1553 rcu_read_unlock(); 1554 return onlink; 1555 } 1556 EXPORT_SYMBOL(ipv6_chk_prefix); 1557 1558 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr, 1559 struct net_device *dev, int strict) 1560 { 1561 struct inet6_ifaddr *ifp, *result = NULL; 1562 unsigned int hash = inet6_addr_hash(addr); 1563 1564 rcu_read_lock_bh(); 1565 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) { 1566 if (!net_eq(dev_net(ifp->idev->dev), net)) 1567 continue; 1568 if (ipv6_addr_equal(&ifp->addr, addr)) { 1569 if (dev == NULL || ifp->idev->dev == dev || 1570 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) { 1571 result = ifp; 1572 in6_ifa_hold(ifp); 1573 break; 1574 } 1575 } 1576 } 1577 rcu_read_unlock_bh(); 1578 1579 return result; 1580 } 1581 1582 /* Gets referenced address, destroys ifaddr */ 1583 1584 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed) 1585 { 1586 if (ifp->flags&IFA_F_PERMANENT) { 1587 spin_lock_bh(&ifp->lock); 1588 addrconf_del_dad_timer(ifp); 1589 ifp->flags |= IFA_F_TENTATIVE; 1590 if (dad_failed) 1591 ifp->flags |= IFA_F_DADFAILED; 1592 spin_unlock_bh(&ifp->lock); 1593 if (dad_failed) 1594 ipv6_ifa_notify(0, ifp); 1595 in6_ifa_put(ifp); 1596 #ifdef CONFIG_IPV6_PRIVACY 1597 } else if (ifp->flags&IFA_F_TEMPORARY) { 1598 struct inet6_ifaddr *ifpub; 1599 spin_lock_bh(&ifp->lock); 1600 ifpub = ifp->ifpub; 1601 if (ifpub) { 1602 in6_ifa_hold(ifpub); 1603 spin_unlock_bh(&ifp->lock); 1604 ipv6_create_tempaddr(ifpub, ifp); 1605 in6_ifa_put(ifpub); 1606 } else { 1607 spin_unlock_bh(&ifp->lock); 1608 } 1609 ipv6_del_addr(ifp); 1610 #endif 1611 } else 1612 ipv6_del_addr(ifp); 1613 } 1614 1615 static int addrconf_dad_end(struct inet6_ifaddr *ifp) 1616 { 1617 int err = -ENOENT; 1618 1619 spin_lock(&ifp->state_lock); 1620 if (ifp->state == INET6_IFADDR_STATE_DAD) { 1621 ifp->state = INET6_IFADDR_STATE_POSTDAD; 1622 err = 0; 1623 } 1624 spin_unlock(&ifp->state_lock); 1625 1626 return err; 1627 } 1628 1629 void addrconf_dad_failure(struct inet6_ifaddr *ifp) 1630 { 1631 struct inet6_dev *idev = ifp->idev; 1632 1633 if (addrconf_dad_end(ifp)) { 1634 in6_ifa_put(ifp); 1635 return; 1636 } 1637 1638 net_info_ratelimited("%s: IPv6 duplicate address %pI6c detected!\n", 1639 ifp->idev->dev->name, &ifp->addr); 1640 1641 if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6) { 1642 struct in6_addr addr; 1643 1644 addr.s6_addr32[0] = htonl(0xfe800000); 1645 addr.s6_addr32[1] = 0; 1646 1647 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) && 1648 ipv6_addr_equal(&ifp->addr, &addr)) { 1649 /* DAD failed for link-local based on MAC address */ 1650 idev->cnf.disable_ipv6 = 1; 1651 1652 pr_info("%s: IPv6 being disabled!\n", 1653 ifp->idev->dev->name); 1654 } 1655 } 1656 1657 addrconf_dad_stop(ifp, 1); 1658 } 1659 1660 /* Join to solicited addr multicast group. */ 1661 1662 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr) 1663 { 1664 struct in6_addr maddr; 1665 1666 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP)) 1667 return; 1668 1669 addrconf_addr_solict_mult(addr, &maddr); 1670 ipv6_dev_mc_inc(dev, &maddr); 1671 } 1672 1673 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr) 1674 { 1675 struct in6_addr maddr; 1676 1677 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP)) 1678 return; 1679 1680 addrconf_addr_solict_mult(addr, &maddr); 1681 __ipv6_dev_mc_dec(idev, &maddr); 1682 } 1683 1684 static void addrconf_join_anycast(struct inet6_ifaddr *ifp) 1685 { 1686 struct in6_addr addr; 1687 if (ifp->prefix_len == 127) /* RFC 6164 */ 1688 return; 1689 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len); 1690 if (ipv6_addr_any(&addr)) 1691 return; 1692 ipv6_dev_ac_inc(ifp->idev->dev, &addr); 1693 } 1694 1695 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp) 1696 { 1697 struct in6_addr addr; 1698 if (ifp->prefix_len == 127) /* RFC 6164 */ 1699 return; 1700 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len); 1701 if (ipv6_addr_any(&addr)) 1702 return; 1703 __ipv6_dev_ac_dec(ifp->idev, &addr); 1704 } 1705 1706 static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev) 1707 { 1708 if (dev->addr_len != ETH_ALEN) 1709 return -1; 1710 memcpy(eui, dev->dev_addr, 3); 1711 memcpy(eui + 5, dev->dev_addr + 3, 3); 1712 1713 /* 1714 * The zSeries OSA network cards can be shared among various 1715 * OS instances, but the OSA cards have only one MAC address. 1716 * This leads to duplicate address conflicts in conjunction 1717 * with IPv6 if more than one instance uses the same card. 1718 * 1719 * The driver for these cards can deliver a unique 16-bit 1720 * identifier for each instance sharing the same card. It is 1721 * placed instead of 0xFFFE in the interface identifier. The 1722 * "u" bit of the interface identifier is not inverted in this 1723 * case. Hence the resulting interface identifier has local 1724 * scope according to RFC2373. 1725 */ 1726 if (dev->dev_id) { 1727 eui[3] = (dev->dev_id >> 8) & 0xFF; 1728 eui[4] = dev->dev_id & 0xFF; 1729 } else { 1730 eui[3] = 0xFF; 1731 eui[4] = 0xFE; 1732 eui[0] ^= 2; 1733 } 1734 return 0; 1735 } 1736 1737 static int addrconf_ifid_eui64(u8 *eui, struct net_device *dev) 1738 { 1739 if (dev->addr_len != IEEE802154_ADDR_LEN) 1740 return -1; 1741 memcpy(eui, dev->dev_addr, 8); 1742 eui[0] ^= 2; 1743 return 0; 1744 } 1745 1746 static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev) 1747 { 1748 union fwnet_hwaddr *ha; 1749 1750 if (dev->addr_len != FWNET_ALEN) 1751 return -1; 1752 1753 ha = (union fwnet_hwaddr *)dev->dev_addr; 1754 1755 memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id)); 1756 eui[0] ^= 2; 1757 return 0; 1758 } 1759 1760 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev) 1761 { 1762 /* XXX: inherit EUI-64 from other interface -- yoshfuji */ 1763 if (dev->addr_len != ARCNET_ALEN) 1764 return -1; 1765 memset(eui, 0, 7); 1766 eui[7] = *(u8 *)dev->dev_addr; 1767 return 0; 1768 } 1769 1770 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev) 1771 { 1772 if (dev->addr_len != INFINIBAND_ALEN) 1773 return -1; 1774 memcpy(eui, dev->dev_addr + 12, 8); 1775 eui[0] |= 2; 1776 return 0; 1777 } 1778 1779 static int __ipv6_isatap_ifid(u8 *eui, __be32 addr) 1780 { 1781 if (addr == 0) 1782 return -1; 1783 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) || 1784 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) || 1785 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) || 1786 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) || 1787 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) || 1788 ipv4_is_lbcast(addr)) ? 0x00 : 0x02; 1789 eui[1] = 0; 1790 eui[2] = 0x5E; 1791 eui[3] = 0xFE; 1792 memcpy(eui + 4, &addr, 4); 1793 return 0; 1794 } 1795 1796 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev) 1797 { 1798 if (dev->priv_flags & IFF_ISATAP) 1799 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr); 1800 return -1; 1801 } 1802 1803 static int addrconf_ifid_gre(u8 *eui, struct net_device *dev) 1804 { 1805 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr); 1806 } 1807 1808 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev) 1809 { 1810 switch (dev->type) { 1811 case ARPHRD_ETHER: 1812 case ARPHRD_FDDI: 1813 return addrconf_ifid_eui48(eui, dev); 1814 case ARPHRD_ARCNET: 1815 return addrconf_ifid_arcnet(eui, dev); 1816 case ARPHRD_INFINIBAND: 1817 return addrconf_ifid_infiniband(eui, dev); 1818 case ARPHRD_SIT: 1819 return addrconf_ifid_sit(eui, dev); 1820 case ARPHRD_IPGRE: 1821 return addrconf_ifid_gre(eui, dev); 1822 case ARPHRD_IEEE802154: 1823 return addrconf_ifid_eui64(eui, dev); 1824 case ARPHRD_IEEE1394: 1825 return addrconf_ifid_ieee1394(eui, dev); 1826 } 1827 return -1; 1828 } 1829 1830 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev) 1831 { 1832 int err = -1; 1833 struct inet6_ifaddr *ifp; 1834 1835 read_lock_bh(&idev->lock); 1836 list_for_each_entry(ifp, &idev->addr_list, if_list) { 1837 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) { 1838 memcpy(eui, ifp->addr.s6_addr+8, 8); 1839 err = 0; 1840 break; 1841 } 1842 } 1843 read_unlock_bh(&idev->lock); 1844 return err; 1845 } 1846 1847 #ifdef CONFIG_IPV6_PRIVACY 1848 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */ 1849 static void __ipv6_regen_rndid(struct inet6_dev *idev) 1850 { 1851 regen: 1852 get_random_bytes(idev->rndid, sizeof(idev->rndid)); 1853 idev->rndid[0] &= ~0x02; 1854 1855 /* 1856 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>: 1857 * check if generated address is not inappropriate 1858 * 1859 * - Reserved subnet anycast (RFC 2526) 1860 * 11111101 11....11 1xxxxxxx 1861 * - ISATAP (RFC4214) 6.1 1862 * 00-00-5E-FE-xx-xx-xx-xx 1863 * - value 0 1864 * - XXX: already assigned to an address on the device 1865 */ 1866 if (idev->rndid[0] == 0xfd && 1867 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff && 1868 (idev->rndid[7]&0x80)) 1869 goto regen; 1870 if ((idev->rndid[0]|idev->rndid[1]) == 0) { 1871 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe) 1872 goto regen; 1873 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00) 1874 goto regen; 1875 } 1876 } 1877 1878 static void ipv6_regen_rndid(unsigned long data) 1879 { 1880 struct inet6_dev *idev = (struct inet6_dev *) data; 1881 unsigned long expires; 1882 1883 rcu_read_lock_bh(); 1884 write_lock_bh(&idev->lock); 1885 1886 if (idev->dead) 1887 goto out; 1888 1889 __ipv6_regen_rndid(idev); 1890 1891 expires = jiffies + 1892 idev->cnf.temp_prefered_lft * HZ - 1893 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time - 1894 idev->cnf.max_desync_factor * HZ; 1895 if (time_before(expires, jiffies)) { 1896 pr_warn("%s: too short regeneration interval; timer disabled for %s\n", 1897 __func__, idev->dev->name); 1898 goto out; 1899 } 1900 1901 if (!mod_timer(&idev->regen_timer, expires)) 1902 in6_dev_hold(idev); 1903 1904 out: 1905 write_unlock_bh(&idev->lock); 1906 rcu_read_unlock_bh(); 1907 in6_dev_put(idev); 1908 } 1909 1910 static void __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) 1911 { 1912 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0) 1913 __ipv6_regen_rndid(idev); 1914 } 1915 #endif 1916 1917 /* 1918 * Add prefix route. 1919 */ 1920 1921 static void 1922 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev, 1923 unsigned long expires, u32 flags) 1924 { 1925 struct fib6_config cfg = { 1926 .fc_table = RT6_TABLE_PREFIX, 1927 .fc_metric = IP6_RT_PRIO_ADDRCONF, 1928 .fc_ifindex = dev->ifindex, 1929 .fc_expires = expires, 1930 .fc_dst_len = plen, 1931 .fc_flags = RTF_UP | flags, 1932 .fc_nlinfo.nl_net = dev_net(dev), 1933 .fc_protocol = RTPROT_KERNEL, 1934 }; 1935 1936 cfg.fc_dst = *pfx; 1937 1938 /* Prevent useless cloning on PtP SIT. 1939 This thing is done here expecting that the whole 1940 class of non-broadcast devices need not cloning. 1941 */ 1942 #if IS_ENABLED(CONFIG_IPV6_SIT) 1943 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT)) 1944 cfg.fc_flags |= RTF_NONEXTHOP; 1945 #endif 1946 1947 ip6_route_add(&cfg); 1948 } 1949 1950 1951 static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx, 1952 int plen, 1953 const struct net_device *dev, 1954 u32 flags, u32 noflags) 1955 { 1956 struct fib6_node *fn; 1957 struct rt6_info *rt = NULL; 1958 struct fib6_table *table; 1959 1960 table = fib6_get_table(dev_net(dev), RT6_TABLE_PREFIX); 1961 if (table == NULL) 1962 return NULL; 1963 1964 read_lock_bh(&table->tb6_lock); 1965 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0); 1966 if (!fn) 1967 goto out; 1968 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) { 1969 if (rt->dst.dev->ifindex != dev->ifindex) 1970 continue; 1971 if ((rt->rt6i_flags & flags) != flags) 1972 continue; 1973 if ((rt->rt6i_flags & noflags) != 0) 1974 continue; 1975 dst_hold(&rt->dst); 1976 break; 1977 } 1978 out: 1979 read_unlock_bh(&table->tb6_lock); 1980 return rt; 1981 } 1982 1983 1984 /* Create "default" multicast route to the interface */ 1985 1986 static void addrconf_add_mroute(struct net_device *dev) 1987 { 1988 struct fib6_config cfg = { 1989 .fc_table = RT6_TABLE_LOCAL, 1990 .fc_metric = IP6_RT_PRIO_ADDRCONF, 1991 .fc_ifindex = dev->ifindex, 1992 .fc_dst_len = 8, 1993 .fc_flags = RTF_UP, 1994 .fc_nlinfo.nl_net = dev_net(dev), 1995 }; 1996 1997 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0); 1998 1999 ip6_route_add(&cfg); 2000 } 2001 2002 #if IS_ENABLED(CONFIG_IPV6_SIT) 2003 static void sit_route_add(struct net_device *dev) 2004 { 2005 struct fib6_config cfg = { 2006 .fc_table = RT6_TABLE_MAIN, 2007 .fc_metric = IP6_RT_PRIO_ADDRCONF, 2008 .fc_ifindex = dev->ifindex, 2009 .fc_dst_len = 96, 2010 .fc_flags = RTF_UP | RTF_NONEXTHOP, 2011 .fc_nlinfo.nl_net = dev_net(dev), 2012 }; 2013 2014 /* prefix length - 96 bits "::d.d.d.d" */ 2015 ip6_route_add(&cfg); 2016 } 2017 #endif 2018 2019 static struct inet6_dev *addrconf_add_dev(struct net_device *dev) 2020 { 2021 struct inet6_dev *idev; 2022 2023 ASSERT_RTNL(); 2024 2025 idev = ipv6_find_idev(dev); 2026 if (!idev) 2027 return ERR_PTR(-ENOBUFS); 2028 2029 if (idev->cnf.disable_ipv6) 2030 return ERR_PTR(-EACCES); 2031 2032 /* Add default multicast route */ 2033 if (!(dev->flags & IFF_LOOPBACK)) 2034 addrconf_add_mroute(dev); 2035 2036 return idev; 2037 } 2038 2039 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao) 2040 { 2041 struct prefix_info *pinfo; 2042 __u32 valid_lft; 2043 __u32 prefered_lft; 2044 int addr_type; 2045 struct inet6_dev *in6_dev; 2046 struct net *net = dev_net(dev); 2047 2048 pinfo = (struct prefix_info *) opt; 2049 2050 if (len < sizeof(struct prefix_info)) { 2051 ADBG(("addrconf: prefix option too short\n")); 2052 return; 2053 } 2054 2055 /* 2056 * Validation checks ([ADDRCONF], page 19) 2057 */ 2058 2059 addr_type = ipv6_addr_type(&pinfo->prefix); 2060 2061 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL)) 2062 return; 2063 2064 valid_lft = ntohl(pinfo->valid); 2065 prefered_lft = ntohl(pinfo->prefered); 2066 2067 if (prefered_lft > valid_lft) { 2068 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n"); 2069 return; 2070 } 2071 2072 in6_dev = in6_dev_get(dev); 2073 2074 if (in6_dev == NULL) { 2075 net_dbg_ratelimited("addrconf: device %s not configured\n", 2076 dev->name); 2077 return; 2078 } 2079 2080 /* 2081 * Two things going on here: 2082 * 1) Add routes for on-link prefixes 2083 * 2) Configure prefixes with the auto flag set 2084 */ 2085 2086 if (pinfo->onlink) { 2087 struct rt6_info *rt; 2088 unsigned long rt_expires; 2089 2090 /* Avoid arithmetic overflow. Really, we could 2091 * save rt_expires in seconds, likely valid_lft, 2092 * but it would require division in fib gc, that it 2093 * not good. 2094 */ 2095 if (HZ > USER_HZ) 2096 rt_expires = addrconf_timeout_fixup(valid_lft, HZ); 2097 else 2098 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ); 2099 2100 if (addrconf_finite_timeout(rt_expires)) 2101 rt_expires *= HZ; 2102 2103 rt = addrconf_get_prefix_route(&pinfo->prefix, 2104 pinfo->prefix_len, 2105 dev, 2106 RTF_ADDRCONF | RTF_PREFIX_RT, 2107 RTF_GATEWAY | RTF_DEFAULT); 2108 2109 if (rt) { 2110 /* Autoconf prefix route */ 2111 if (valid_lft == 0) { 2112 ip6_del_rt(rt); 2113 rt = NULL; 2114 } else if (addrconf_finite_timeout(rt_expires)) { 2115 /* not infinity */ 2116 rt6_set_expires(rt, jiffies + rt_expires); 2117 } else { 2118 rt6_clean_expires(rt); 2119 } 2120 } else if (valid_lft) { 2121 clock_t expires = 0; 2122 int flags = RTF_ADDRCONF | RTF_PREFIX_RT; 2123 if (addrconf_finite_timeout(rt_expires)) { 2124 /* not infinity */ 2125 flags |= RTF_EXPIRES; 2126 expires = jiffies_to_clock_t(rt_expires); 2127 } 2128 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len, 2129 dev, expires, flags); 2130 } 2131 ip6_rt_put(rt); 2132 } 2133 2134 /* Try to figure out our local address for this prefix */ 2135 2136 if (pinfo->autoconf && in6_dev->cnf.autoconf) { 2137 struct inet6_ifaddr *ifp; 2138 struct in6_addr addr; 2139 int create = 0, update_lft = 0; 2140 bool tokenized = false; 2141 2142 if (pinfo->prefix_len == 64) { 2143 memcpy(&addr, &pinfo->prefix, 8); 2144 2145 if (!ipv6_addr_any(&in6_dev->token)) { 2146 read_lock_bh(&in6_dev->lock); 2147 memcpy(addr.s6_addr + 8, 2148 in6_dev->token.s6_addr + 8, 8); 2149 read_unlock_bh(&in6_dev->lock); 2150 tokenized = true; 2151 } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) && 2152 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) { 2153 in6_dev_put(in6_dev); 2154 return; 2155 } 2156 goto ok; 2157 } 2158 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n", 2159 pinfo->prefix_len); 2160 in6_dev_put(in6_dev); 2161 return; 2162 2163 ok: 2164 2165 ifp = ipv6_get_ifaddr(net, &addr, dev, 1); 2166 2167 if (ifp == NULL && valid_lft) { 2168 int max_addresses = in6_dev->cnf.max_addresses; 2169 u32 addr_flags = 0; 2170 2171 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 2172 if (in6_dev->cnf.optimistic_dad && 2173 !net->ipv6.devconf_all->forwarding && sllao) 2174 addr_flags = IFA_F_OPTIMISTIC; 2175 #endif 2176 2177 /* Do not allow to create too much of autoconfigured 2178 * addresses; this would be too easy way to crash kernel. 2179 */ 2180 if (!max_addresses || 2181 ipv6_count_addresses(in6_dev) < max_addresses) 2182 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len, 2183 addr_type&IPV6_ADDR_SCOPE_MASK, 2184 addr_flags); 2185 2186 if (IS_ERR_OR_NULL(ifp)) { 2187 in6_dev_put(in6_dev); 2188 return; 2189 } 2190 2191 update_lft = create = 1; 2192 ifp->cstamp = jiffies; 2193 ifp->tokenized = tokenized; 2194 addrconf_dad_start(ifp); 2195 } 2196 2197 if (ifp) { 2198 int flags; 2199 unsigned long now; 2200 #ifdef CONFIG_IPV6_PRIVACY 2201 struct inet6_ifaddr *ift; 2202 #endif 2203 u32 stored_lft; 2204 2205 /* update lifetime (RFC2462 5.5.3 e) */ 2206 spin_lock(&ifp->lock); 2207 now = jiffies; 2208 if (ifp->valid_lft > (now - ifp->tstamp) / HZ) 2209 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ; 2210 else 2211 stored_lft = 0; 2212 if (!update_lft && stored_lft) { 2213 if (valid_lft > MIN_VALID_LIFETIME || 2214 valid_lft > stored_lft) 2215 update_lft = 1; 2216 else if (stored_lft <= MIN_VALID_LIFETIME) { 2217 /* valid_lft <= stored_lft is always true */ 2218 /* 2219 * RFC 4862 Section 5.5.3e: 2220 * "Note that the preferred lifetime of 2221 * the corresponding address is always 2222 * reset to the Preferred Lifetime in 2223 * the received Prefix Information 2224 * option, regardless of whether the 2225 * valid lifetime is also reset or 2226 * ignored." 2227 * 2228 * So if the preferred lifetime in 2229 * this advertisement is different 2230 * than what we have stored, but the 2231 * valid lifetime is invalid, just 2232 * reset prefered_lft. 2233 * 2234 * We must set the valid lifetime 2235 * to the stored lifetime since we'll 2236 * be updating the timestamp below, 2237 * else we'll set it back to the 2238 * minimum. 2239 */ 2240 if (prefered_lft != ifp->prefered_lft) { 2241 valid_lft = stored_lft; 2242 update_lft = 1; 2243 } 2244 } else { 2245 valid_lft = MIN_VALID_LIFETIME; 2246 if (valid_lft < prefered_lft) 2247 prefered_lft = valid_lft; 2248 update_lft = 1; 2249 } 2250 } 2251 2252 if (update_lft) { 2253 ifp->valid_lft = valid_lft; 2254 ifp->prefered_lft = prefered_lft; 2255 ifp->tstamp = now; 2256 flags = ifp->flags; 2257 ifp->flags &= ~IFA_F_DEPRECATED; 2258 spin_unlock(&ifp->lock); 2259 2260 if (!(flags&IFA_F_TENTATIVE)) 2261 ipv6_ifa_notify(0, ifp); 2262 } else 2263 spin_unlock(&ifp->lock); 2264 2265 #ifdef CONFIG_IPV6_PRIVACY 2266 read_lock_bh(&in6_dev->lock); 2267 /* update all temporary addresses in the list */ 2268 list_for_each_entry(ift, &in6_dev->tempaddr_list, 2269 tmp_list) { 2270 int age, max_valid, max_prefered; 2271 2272 if (ifp != ift->ifpub) 2273 continue; 2274 2275 /* 2276 * RFC 4941 section 3.3: 2277 * If a received option will extend the lifetime 2278 * of a public address, the lifetimes of 2279 * temporary addresses should be extended, 2280 * subject to the overall constraint that no 2281 * temporary addresses should ever remain 2282 * "valid" or "preferred" for a time longer than 2283 * (TEMP_VALID_LIFETIME) or 2284 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), 2285 * respectively. 2286 */ 2287 age = (now - ift->cstamp) / HZ; 2288 max_valid = in6_dev->cnf.temp_valid_lft - age; 2289 if (max_valid < 0) 2290 max_valid = 0; 2291 2292 max_prefered = in6_dev->cnf.temp_prefered_lft - 2293 in6_dev->cnf.max_desync_factor - 2294 age; 2295 if (max_prefered < 0) 2296 max_prefered = 0; 2297 2298 if (valid_lft > max_valid) 2299 valid_lft = max_valid; 2300 2301 if (prefered_lft > max_prefered) 2302 prefered_lft = max_prefered; 2303 2304 spin_lock(&ift->lock); 2305 flags = ift->flags; 2306 ift->valid_lft = valid_lft; 2307 ift->prefered_lft = prefered_lft; 2308 ift->tstamp = now; 2309 if (prefered_lft > 0) 2310 ift->flags &= ~IFA_F_DEPRECATED; 2311 2312 spin_unlock(&ift->lock); 2313 if (!(flags&IFA_F_TENTATIVE)) 2314 ipv6_ifa_notify(0, ift); 2315 } 2316 2317 if ((create || list_empty(&in6_dev->tempaddr_list)) && in6_dev->cnf.use_tempaddr > 0) { 2318 /* 2319 * When a new public address is created as 2320 * described in [ADDRCONF], also create a new 2321 * temporary address. Also create a temporary 2322 * address if it's enabled but no temporary 2323 * address currently exists. 2324 */ 2325 read_unlock_bh(&in6_dev->lock); 2326 ipv6_create_tempaddr(ifp, NULL); 2327 } else { 2328 read_unlock_bh(&in6_dev->lock); 2329 } 2330 #endif 2331 in6_ifa_put(ifp); 2332 addrconf_verify(0); 2333 } 2334 } 2335 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo); 2336 in6_dev_put(in6_dev); 2337 } 2338 2339 /* 2340 * Set destination address. 2341 * Special case for SIT interfaces where we create a new "virtual" 2342 * device. 2343 */ 2344 int addrconf_set_dstaddr(struct net *net, void __user *arg) 2345 { 2346 struct in6_ifreq ireq; 2347 struct net_device *dev; 2348 int err = -EINVAL; 2349 2350 rtnl_lock(); 2351 2352 err = -EFAULT; 2353 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2354 goto err_exit; 2355 2356 dev = __dev_get_by_index(net, ireq.ifr6_ifindex); 2357 2358 err = -ENODEV; 2359 if (dev == NULL) 2360 goto err_exit; 2361 2362 #if IS_ENABLED(CONFIG_IPV6_SIT) 2363 if (dev->type == ARPHRD_SIT) { 2364 const struct net_device_ops *ops = dev->netdev_ops; 2365 struct ifreq ifr; 2366 struct ip_tunnel_parm p; 2367 2368 err = -EADDRNOTAVAIL; 2369 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4)) 2370 goto err_exit; 2371 2372 memset(&p, 0, sizeof(p)); 2373 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3]; 2374 p.iph.saddr = 0; 2375 p.iph.version = 4; 2376 p.iph.ihl = 5; 2377 p.iph.protocol = IPPROTO_IPV6; 2378 p.iph.ttl = 64; 2379 ifr.ifr_ifru.ifru_data = (__force void __user *)&p; 2380 2381 if (ops->ndo_do_ioctl) { 2382 mm_segment_t oldfs = get_fs(); 2383 2384 set_fs(KERNEL_DS); 2385 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL); 2386 set_fs(oldfs); 2387 } else 2388 err = -EOPNOTSUPP; 2389 2390 if (err == 0) { 2391 err = -ENOBUFS; 2392 dev = __dev_get_by_name(net, p.name); 2393 if (!dev) 2394 goto err_exit; 2395 err = dev_open(dev); 2396 } 2397 } 2398 #endif 2399 2400 err_exit: 2401 rtnl_unlock(); 2402 return err; 2403 } 2404 2405 /* 2406 * Manual configuration of address on an interface 2407 */ 2408 static int inet6_addr_add(struct net *net, int ifindex, const struct in6_addr *pfx, 2409 const struct in6_addr *peer_pfx, 2410 unsigned int plen, __u8 ifa_flags, __u32 prefered_lft, 2411 __u32 valid_lft) 2412 { 2413 struct inet6_ifaddr *ifp; 2414 struct inet6_dev *idev; 2415 struct net_device *dev; 2416 int scope; 2417 u32 flags; 2418 clock_t expires; 2419 unsigned long timeout; 2420 2421 ASSERT_RTNL(); 2422 2423 if (plen > 128) 2424 return -EINVAL; 2425 2426 /* check the lifetime */ 2427 if (!valid_lft || prefered_lft > valid_lft) 2428 return -EINVAL; 2429 2430 dev = __dev_get_by_index(net, ifindex); 2431 if (!dev) 2432 return -ENODEV; 2433 2434 idev = addrconf_add_dev(dev); 2435 if (IS_ERR(idev)) 2436 return PTR_ERR(idev); 2437 2438 scope = ipv6_addr_scope(pfx); 2439 2440 timeout = addrconf_timeout_fixup(valid_lft, HZ); 2441 if (addrconf_finite_timeout(timeout)) { 2442 expires = jiffies_to_clock_t(timeout * HZ); 2443 valid_lft = timeout; 2444 flags = RTF_EXPIRES; 2445 } else { 2446 expires = 0; 2447 flags = 0; 2448 ifa_flags |= IFA_F_PERMANENT; 2449 } 2450 2451 timeout = addrconf_timeout_fixup(prefered_lft, HZ); 2452 if (addrconf_finite_timeout(timeout)) { 2453 if (timeout == 0) 2454 ifa_flags |= IFA_F_DEPRECATED; 2455 prefered_lft = timeout; 2456 } 2457 2458 ifp = ipv6_add_addr(idev, pfx, plen, scope, ifa_flags); 2459 2460 if (!IS_ERR(ifp)) { 2461 spin_lock_bh(&ifp->lock); 2462 ifp->valid_lft = valid_lft; 2463 ifp->prefered_lft = prefered_lft; 2464 ifp->tstamp = jiffies; 2465 if (peer_pfx) 2466 ifp->peer_addr = *peer_pfx; 2467 spin_unlock_bh(&ifp->lock); 2468 2469 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev, 2470 expires, flags); 2471 /* 2472 * Note that section 3.1 of RFC 4429 indicates 2473 * that the Optimistic flag should not be set for 2474 * manually configured addresses 2475 */ 2476 addrconf_dad_start(ifp); 2477 in6_ifa_put(ifp); 2478 addrconf_verify(0); 2479 return 0; 2480 } 2481 2482 return PTR_ERR(ifp); 2483 } 2484 2485 static int inet6_addr_del(struct net *net, int ifindex, const struct in6_addr *pfx, 2486 unsigned int plen) 2487 { 2488 struct inet6_ifaddr *ifp; 2489 struct inet6_dev *idev; 2490 struct net_device *dev; 2491 2492 if (plen > 128) 2493 return -EINVAL; 2494 2495 dev = __dev_get_by_index(net, ifindex); 2496 if (!dev) 2497 return -ENODEV; 2498 2499 if ((idev = __in6_dev_get(dev)) == NULL) 2500 return -ENXIO; 2501 2502 read_lock_bh(&idev->lock); 2503 list_for_each_entry(ifp, &idev->addr_list, if_list) { 2504 if (ifp->prefix_len == plen && 2505 ipv6_addr_equal(pfx, &ifp->addr)) { 2506 in6_ifa_hold(ifp); 2507 read_unlock_bh(&idev->lock); 2508 2509 ipv6_del_addr(ifp); 2510 return 0; 2511 } 2512 } 2513 read_unlock_bh(&idev->lock); 2514 return -EADDRNOTAVAIL; 2515 } 2516 2517 2518 int addrconf_add_ifaddr(struct net *net, void __user *arg) 2519 { 2520 struct in6_ifreq ireq; 2521 int err; 2522 2523 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 2524 return -EPERM; 2525 2526 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2527 return -EFAULT; 2528 2529 rtnl_lock(); 2530 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, NULL, 2531 ireq.ifr6_prefixlen, IFA_F_PERMANENT, 2532 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME); 2533 rtnl_unlock(); 2534 return err; 2535 } 2536 2537 int addrconf_del_ifaddr(struct net *net, void __user *arg) 2538 { 2539 struct in6_ifreq ireq; 2540 int err; 2541 2542 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 2543 return -EPERM; 2544 2545 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2546 return -EFAULT; 2547 2548 rtnl_lock(); 2549 err = inet6_addr_del(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, 2550 ireq.ifr6_prefixlen); 2551 rtnl_unlock(); 2552 return err; 2553 } 2554 2555 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr, 2556 int plen, int scope) 2557 { 2558 struct inet6_ifaddr *ifp; 2559 2560 ifp = ipv6_add_addr(idev, addr, plen, scope, IFA_F_PERMANENT); 2561 if (!IS_ERR(ifp)) { 2562 spin_lock_bh(&ifp->lock); 2563 ifp->flags &= ~IFA_F_TENTATIVE; 2564 spin_unlock_bh(&ifp->lock); 2565 ipv6_ifa_notify(RTM_NEWADDR, ifp); 2566 in6_ifa_put(ifp); 2567 } 2568 } 2569 2570 #if IS_ENABLED(CONFIG_IPV6_SIT) 2571 static void sit_add_v4_addrs(struct inet6_dev *idev) 2572 { 2573 struct in6_addr addr; 2574 struct net_device *dev; 2575 struct net *net = dev_net(idev->dev); 2576 int scope; 2577 2578 ASSERT_RTNL(); 2579 2580 memset(&addr, 0, sizeof(struct in6_addr)); 2581 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4); 2582 2583 if (idev->dev->flags&IFF_POINTOPOINT) { 2584 addr.s6_addr32[0] = htonl(0xfe800000); 2585 scope = IFA_LINK; 2586 } else { 2587 scope = IPV6_ADDR_COMPATv4; 2588 } 2589 2590 if (addr.s6_addr32[3]) { 2591 add_addr(idev, &addr, 128, scope); 2592 return; 2593 } 2594 2595 for_each_netdev(net, dev) { 2596 struct in_device *in_dev = __in_dev_get_rtnl(dev); 2597 if (in_dev && (dev->flags & IFF_UP)) { 2598 struct in_ifaddr *ifa; 2599 2600 int flag = scope; 2601 2602 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) { 2603 int plen; 2604 2605 addr.s6_addr32[3] = ifa->ifa_local; 2606 2607 if (ifa->ifa_scope == RT_SCOPE_LINK) 2608 continue; 2609 if (ifa->ifa_scope >= RT_SCOPE_HOST) { 2610 if (idev->dev->flags&IFF_POINTOPOINT) 2611 continue; 2612 flag |= IFA_HOST; 2613 } 2614 if (idev->dev->flags&IFF_POINTOPOINT) 2615 plen = 64; 2616 else 2617 plen = 96; 2618 2619 add_addr(idev, &addr, plen, flag); 2620 } 2621 } 2622 } 2623 } 2624 #endif 2625 2626 static void init_loopback(struct net_device *dev) 2627 { 2628 struct inet6_dev *idev; 2629 struct net_device *sp_dev; 2630 struct inet6_ifaddr *sp_ifa; 2631 struct rt6_info *sp_rt; 2632 2633 /* ::1 */ 2634 2635 ASSERT_RTNL(); 2636 2637 if ((idev = ipv6_find_idev(dev)) == NULL) { 2638 pr_debug("%s: add_dev failed\n", __func__); 2639 return; 2640 } 2641 2642 add_addr(idev, &in6addr_loopback, 128, IFA_HOST); 2643 2644 /* Add routes to other interface's IPv6 addresses */ 2645 for_each_netdev(dev_net(dev), sp_dev) { 2646 if (!strcmp(sp_dev->name, dev->name)) 2647 continue; 2648 2649 idev = __in6_dev_get(sp_dev); 2650 if (!idev) 2651 continue; 2652 2653 read_lock_bh(&idev->lock); 2654 list_for_each_entry(sp_ifa, &idev->addr_list, if_list) { 2655 2656 if (sp_ifa->flags & (IFA_F_DADFAILED | IFA_F_TENTATIVE)) 2657 continue; 2658 2659 if (sp_ifa->rt) 2660 continue; 2661 2662 sp_rt = addrconf_dst_alloc(idev, &sp_ifa->addr, 0); 2663 2664 /* Failure cases are ignored */ 2665 if (!IS_ERR(sp_rt)) { 2666 sp_ifa->rt = sp_rt; 2667 ip6_ins_rt(sp_rt); 2668 } 2669 } 2670 read_unlock_bh(&idev->lock); 2671 } 2672 } 2673 2674 static void addrconf_add_linklocal(struct inet6_dev *idev, const struct in6_addr *addr) 2675 { 2676 struct inet6_ifaddr *ifp; 2677 u32 addr_flags = IFA_F_PERMANENT; 2678 2679 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 2680 if (idev->cnf.optimistic_dad && 2681 !dev_net(idev->dev)->ipv6.devconf_all->forwarding) 2682 addr_flags |= IFA_F_OPTIMISTIC; 2683 #endif 2684 2685 2686 ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, addr_flags); 2687 if (!IS_ERR(ifp)) { 2688 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0); 2689 addrconf_dad_start(ifp); 2690 in6_ifa_put(ifp); 2691 } 2692 } 2693 2694 static void addrconf_dev_config(struct net_device *dev) 2695 { 2696 struct in6_addr addr; 2697 struct inet6_dev *idev; 2698 2699 ASSERT_RTNL(); 2700 2701 if ((dev->type != ARPHRD_ETHER) && 2702 (dev->type != ARPHRD_FDDI) && 2703 (dev->type != ARPHRD_ARCNET) && 2704 (dev->type != ARPHRD_INFINIBAND) && 2705 (dev->type != ARPHRD_IEEE802154) && 2706 (dev->type != ARPHRD_IEEE1394)) { 2707 /* Alas, we support only Ethernet autoconfiguration. */ 2708 return; 2709 } 2710 2711 idev = addrconf_add_dev(dev); 2712 if (IS_ERR(idev)) 2713 return; 2714 2715 memset(&addr, 0, sizeof(struct in6_addr)); 2716 addr.s6_addr32[0] = htonl(0xFE800000); 2717 2718 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0) 2719 addrconf_add_linklocal(idev, &addr); 2720 } 2721 2722 #if IS_ENABLED(CONFIG_IPV6_SIT) 2723 static void addrconf_sit_config(struct net_device *dev) 2724 { 2725 struct inet6_dev *idev; 2726 2727 ASSERT_RTNL(); 2728 2729 /* 2730 * Configure the tunnel with one of our IPv4 2731 * addresses... we should configure all of 2732 * our v4 addrs in the tunnel 2733 */ 2734 2735 if ((idev = ipv6_find_idev(dev)) == NULL) { 2736 pr_debug("%s: add_dev failed\n", __func__); 2737 return; 2738 } 2739 2740 if (dev->priv_flags & IFF_ISATAP) { 2741 struct in6_addr addr; 2742 2743 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0); 2744 addrconf_prefix_route(&addr, 64, dev, 0, 0); 2745 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev)) 2746 addrconf_add_linklocal(idev, &addr); 2747 return; 2748 } 2749 2750 sit_add_v4_addrs(idev); 2751 2752 if (dev->flags&IFF_POINTOPOINT) 2753 addrconf_add_mroute(dev); 2754 else 2755 sit_route_add(dev); 2756 } 2757 #endif 2758 2759 #if IS_ENABLED(CONFIG_NET_IPGRE) 2760 static void addrconf_gre_config(struct net_device *dev) 2761 { 2762 struct inet6_dev *idev; 2763 struct in6_addr addr; 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_dad_timer(ifa); 3042 goto restart; 3043 } 3044 } 3045 spin_unlock_bh(&addrconf_hash_lock); 3046 } 3047 3048 write_lock_bh(&idev->lock); 3049 3050 addrconf_del_rs_timer(idev); 3051 3052 /* Step 2: clear flags for stateless addrconf */ 3053 if (!how) 3054 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY); 3055 3056 #ifdef CONFIG_IPV6_PRIVACY 3057 if (how && del_timer(&idev->regen_timer)) 3058 in6_dev_put(idev); 3059 3060 /* Step 3: clear tempaddr list */ 3061 while (!list_empty(&idev->tempaddr_list)) { 3062 ifa = list_first_entry(&idev->tempaddr_list, 3063 struct inet6_ifaddr, tmp_list); 3064 list_del(&ifa->tmp_list); 3065 write_unlock_bh(&idev->lock); 3066 spin_lock_bh(&ifa->lock); 3067 3068 if (ifa->ifpub) { 3069 in6_ifa_put(ifa->ifpub); 3070 ifa->ifpub = NULL; 3071 } 3072 spin_unlock_bh(&ifa->lock); 3073 in6_ifa_put(ifa); 3074 write_lock_bh(&idev->lock); 3075 } 3076 #endif 3077 3078 while (!list_empty(&idev->addr_list)) { 3079 ifa = list_first_entry(&idev->addr_list, 3080 struct inet6_ifaddr, if_list); 3081 addrconf_del_dad_timer(ifa); 3082 3083 list_del(&ifa->if_list); 3084 3085 write_unlock_bh(&idev->lock); 3086 3087 spin_lock_bh(&ifa->state_lock); 3088 state = ifa->state; 3089 ifa->state = INET6_IFADDR_STATE_DEAD; 3090 spin_unlock_bh(&ifa->state_lock); 3091 3092 if (state != INET6_IFADDR_STATE_DEAD) { 3093 __ipv6_ifa_notify(RTM_DELADDR, ifa); 3094 inet6addr_notifier_call_chain(NETDEV_DOWN, ifa); 3095 } 3096 in6_ifa_put(ifa); 3097 3098 write_lock_bh(&idev->lock); 3099 } 3100 3101 write_unlock_bh(&idev->lock); 3102 3103 /* Step 5: Discard multicast list */ 3104 if (how) 3105 ipv6_mc_destroy_dev(idev); 3106 else 3107 ipv6_mc_down(idev); 3108 3109 idev->tstamp = jiffies; 3110 3111 /* Last: Shot the device (if unregistered) */ 3112 if (how) { 3113 addrconf_sysctl_unregister(idev); 3114 neigh_parms_release(&nd_tbl, idev->nd_parms); 3115 neigh_ifdown(&nd_tbl, dev); 3116 in6_dev_put(idev); 3117 } 3118 return 0; 3119 } 3120 3121 static void addrconf_rs_timer(unsigned long data) 3122 { 3123 struct inet6_dev *idev = (struct inet6_dev *)data; 3124 struct in6_addr lladdr; 3125 3126 write_lock(&idev->lock); 3127 if (idev->dead || !(idev->if_flags & IF_READY)) 3128 goto out; 3129 3130 if (!ipv6_accept_ra(idev)) 3131 goto out; 3132 3133 /* Announcement received after solicitation was sent */ 3134 if (idev->if_flags & IF_RA_RCVD) 3135 goto out; 3136 3137 if (idev->rs_probes++ < idev->cnf.rtr_solicits) { 3138 if (!__ipv6_get_lladdr(idev, &lladdr, IFA_F_TENTATIVE)) 3139 ndisc_send_rs(idev->dev, &lladdr, 3140 &in6addr_linklocal_allrouters); 3141 else 3142 goto out; 3143 3144 /* The wait after the last probe can be shorter */ 3145 addrconf_mod_rs_timer(idev, (idev->rs_probes == 3146 idev->cnf.rtr_solicits) ? 3147 idev->cnf.rtr_solicit_delay : 3148 idev->cnf.rtr_solicit_interval); 3149 } else { 3150 /* 3151 * Note: we do not support deprecated "all on-link" 3152 * assumption any longer. 3153 */ 3154 pr_debug("%s: no IPv6 routers present\n", idev->dev->name); 3155 } 3156 3157 out: 3158 write_unlock(&idev->lock); 3159 in6_dev_put(idev); 3160 } 3161 3162 /* 3163 * Duplicate Address Detection 3164 */ 3165 static void addrconf_dad_kick(struct inet6_ifaddr *ifp) 3166 { 3167 unsigned long rand_num; 3168 struct inet6_dev *idev = ifp->idev; 3169 3170 if (ifp->flags & IFA_F_OPTIMISTIC) 3171 rand_num = 0; 3172 else 3173 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1); 3174 3175 ifp->dad_probes = idev->cnf.dad_transmits; 3176 addrconf_mod_dad_timer(ifp, rand_num); 3177 } 3178 3179 static void addrconf_dad_start(struct inet6_ifaddr *ifp) 3180 { 3181 struct inet6_dev *idev = ifp->idev; 3182 struct net_device *dev = idev->dev; 3183 3184 addrconf_join_solict(dev, &ifp->addr); 3185 3186 net_srandom(ifp->addr.s6_addr32[3]); 3187 3188 read_lock_bh(&idev->lock); 3189 spin_lock(&ifp->lock); 3190 if (ifp->state == INET6_IFADDR_STATE_DEAD) 3191 goto out; 3192 3193 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) || 3194 idev->cnf.accept_dad < 1 || 3195 !(ifp->flags&IFA_F_TENTATIVE) || 3196 ifp->flags & IFA_F_NODAD) { 3197 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED); 3198 spin_unlock(&ifp->lock); 3199 read_unlock_bh(&idev->lock); 3200 3201 addrconf_dad_completed(ifp); 3202 return; 3203 } 3204 3205 if (!(idev->if_flags & IF_READY)) { 3206 spin_unlock(&ifp->lock); 3207 read_unlock_bh(&idev->lock); 3208 /* 3209 * If the device is not ready: 3210 * - keep it tentative if it is a permanent address. 3211 * - otherwise, kill it. 3212 */ 3213 in6_ifa_hold(ifp); 3214 addrconf_dad_stop(ifp, 0); 3215 return; 3216 } 3217 3218 /* 3219 * Optimistic nodes can start receiving 3220 * Frames right away 3221 */ 3222 if (ifp->flags & IFA_F_OPTIMISTIC) 3223 ip6_ins_rt(ifp->rt); 3224 3225 addrconf_dad_kick(ifp); 3226 out: 3227 spin_unlock(&ifp->lock); 3228 read_unlock_bh(&idev->lock); 3229 } 3230 3231 static void addrconf_dad_timer(unsigned long data) 3232 { 3233 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data; 3234 struct inet6_dev *idev = ifp->idev; 3235 struct in6_addr mcaddr; 3236 3237 if (!ifp->dad_probes && addrconf_dad_end(ifp)) 3238 goto out; 3239 3240 write_lock(&idev->lock); 3241 if (idev->dead || !(idev->if_flags & IF_READY)) { 3242 write_unlock(&idev->lock); 3243 goto out; 3244 } 3245 3246 spin_lock(&ifp->lock); 3247 if (ifp->state == INET6_IFADDR_STATE_DEAD) { 3248 spin_unlock(&ifp->lock); 3249 write_unlock(&idev->lock); 3250 goto out; 3251 } 3252 3253 if (ifp->dad_probes == 0) { 3254 /* 3255 * DAD was successful 3256 */ 3257 3258 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED); 3259 spin_unlock(&ifp->lock); 3260 write_unlock(&idev->lock); 3261 3262 addrconf_dad_completed(ifp); 3263 3264 goto out; 3265 } 3266 3267 ifp->dad_probes--; 3268 addrconf_mod_dad_timer(ifp, ifp->idev->nd_parms->retrans_time); 3269 spin_unlock(&ifp->lock); 3270 write_unlock(&idev->lock); 3271 3272 /* send a neighbour solicitation for our addr */ 3273 addrconf_addr_solict_mult(&ifp->addr, &mcaddr); 3274 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &in6addr_any); 3275 out: 3276 in6_ifa_put(ifp); 3277 } 3278 3279 static void addrconf_dad_completed(struct inet6_ifaddr *ifp) 3280 { 3281 struct net_device *dev = ifp->idev->dev; 3282 struct in6_addr lladdr; 3283 bool send_rs, send_mld; 3284 3285 addrconf_del_dad_timer(ifp); 3286 3287 /* 3288 * Configure the address for reception. Now it is valid. 3289 */ 3290 3291 ipv6_ifa_notify(RTM_NEWADDR, ifp); 3292 3293 /* If added prefix is link local and we are prepared to process 3294 router advertisements, start sending router solicitations. 3295 */ 3296 3297 read_lock_bh(&ifp->idev->lock); 3298 spin_lock(&ifp->lock); 3299 send_mld = ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL && 3300 ifp->idev->valid_ll_addr_cnt == 1; 3301 send_rs = send_mld && 3302 ipv6_accept_ra(ifp->idev) && 3303 ifp->idev->cnf.rtr_solicits > 0 && 3304 (dev->flags&IFF_LOOPBACK) == 0; 3305 spin_unlock(&ifp->lock); 3306 read_unlock_bh(&ifp->idev->lock); 3307 3308 /* While dad is in progress mld report's source address is in6_addrany. 3309 * Resend with proper ll now. 3310 */ 3311 if (send_mld) 3312 ipv6_mc_dad_complete(ifp->idev); 3313 3314 if (send_rs) { 3315 /* 3316 * If a host as already performed a random delay 3317 * [...] as part of DAD [...] there is no need 3318 * to delay again before sending the first RS 3319 */ 3320 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE)) 3321 return; 3322 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters); 3323 3324 write_lock_bh(&ifp->idev->lock); 3325 spin_lock(&ifp->lock); 3326 ifp->idev->rs_probes = 1; 3327 ifp->idev->if_flags |= IF_RS_SENT; 3328 addrconf_mod_rs_timer(ifp->idev, 3329 ifp->idev->cnf.rtr_solicit_interval); 3330 spin_unlock(&ifp->lock); 3331 write_unlock_bh(&ifp->idev->lock); 3332 } 3333 } 3334 3335 static void addrconf_dad_run(struct inet6_dev *idev) 3336 { 3337 struct inet6_ifaddr *ifp; 3338 3339 read_lock_bh(&idev->lock); 3340 list_for_each_entry(ifp, &idev->addr_list, if_list) { 3341 spin_lock(&ifp->lock); 3342 if (ifp->flags & IFA_F_TENTATIVE && 3343 ifp->state == INET6_IFADDR_STATE_DAD) 3344 addrconf_dad_kick(ifp); 3345 spin_unlock(&ifp->lock); 3346 } 3347 read_unlock_bh(&idev->lock); 3348 } 3349 3350 #ifdef CONFIG_PROC_FS 3351 struct if6_iter_state { 3352 struct seq_net_private p; 3353 int bucket; 3354 int offset; 3355 }; 3356 3357 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos) 3358 { 3359 struct inet6_ifaddr *ifa = NULL; 3360 struct if6_iter_state *state = seq->private; 3361 struct net *net = seq_file_net(seq); 3362 int p = 0; 3363 3364 /* initial bucket if pos is 0 */ 3365 if (pos == 0) { 3366 state->bucket = 0; 3367 state->offset = 0; 3368 } 3369 3370 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) { 3371 hlist_for_each_entry_rcu_bh(ifa, &inet6_addr_lst[state->bucket], 3372 addr_lst) { 3373 if (!net_eq(dev_net(ifa->idev->dev), net)) 3374 continue; 3375 /* sync with offset */ 3376 if (p < state->offset) { 3377 p++; 3378 continue; 3379 } 3380 state->offset++; 3381 return ifa; 3382 } 3383 3384 /* prepare for next bucket */ 3385 state->offset = 0; 3386 p = 0; 3387 } 3388 return NULL; 3389 } 3390 3391 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, 3392 struct inet6_ifaddr *ifa) 3393 { 3394 struct if6_iter_state *state = seq->private; 3395 struct net *net = seq_file_net(seq); 3396 3397 hlist_for_each_entry_continue_rcu_bh(ifa, addr_lst) { 3398 if (!net_eq(dev_net(ifa->idev->dev), net)) 3399 continue; 3400 state->offset++; 3401 return ifa; 3402 } 3403 3404 while (++state->bucket < IN6_ADDR_HSIZE) { 3405 state->offset = 0; 3406 hlist_for_each_entry_rcu_bh(ifa, 3407 &inet6_addr_lst[state->bucket], addr_lst) { 3408 if (!net_eq(dev_net(ifa->idev->dev), net)) 3409 continue; 3410 state->offset++; 3411 return ifa; 3412 } 3413 } 3414 3415 return NULL; 3416 } 3417 3418 static void *if6_seq_start(struct seq_file *seq, loff_t *pos) 3419 __acquires(rcu_bh) 3420 { 3421 rcu_read_lock_bh(); 3422 return if6_get_first(seq, *pos); 3423 } 3424 3425 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos) 3426 { 3427 struct inet6_ifaddr *ifa; 3428 3429 ifa = if6_get_next(seq, v); 3430 ++*pos; 3431 return ifa; 3432 } 3433 3434 static void if6_seq_stop(struct seq_file *seq, void *v) 3435 __releases(rcu_bh) 3436 { 3437 rcu_read_unlock_bh(); 3438 } 3439 3440 static int if6_seq_show(struct seq_file *seq, void *v) 3441 { 3442 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v; 3443 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n", 3444 &ifp->addr, 3445 ifp->idev->dev->ifindex, 3446 ifp->prefix_len, 3447 ifp->scope, 3448 ifp->flags, 3449 ifp->idev->dev->name); 3450 return 0; 3451 } 3452 3453 static const struct seq_operations if6_seq_ops = { 3454 .start = if6_seq_start, 3455 .next = if6_seq_next, 3456 .show = if6_seq_show, 3457 .stop = if6_seq_stop, 3458 }; 3459 3460 static int if6_seq_open(struct inode *inode, struct file *file) 3461 { 3462 return seq_open_net(inode, file, &if6_seq_ops, 3463 sizeof(struct if6_iter_state)); 3464 } 3465 3466 static const struct file_operations if6_fops = { 3467 .owner = THIS_MODULE, 3468 .open = if6_seq_open, 3469 .read = seq_read, 3470 .llseek = seq_lseek, 3471 .release = seq_release_net, 3472 }; 3473 3474 static int __net_init if6_proc_net_init(struct net *net) 3475 { 3476 if (!proc_create("if_inet6", S_IRUGO, net->proc_net, &if6_fops)) 3477 return -ENOMEM; 3478 return 0; 3479 } 3480 3481 static void __net_exit if6_proc_net_exit(struct net *net) 3482 { 3483 remove_proc_entry("if_inet6", net->proc_net); 3484 } 3485 3486 static struct pernet_operations if6_proc_net_ops = { 3487 .init = if6_proc_net_init, 3488 .exit = if6_proc_net_exit, 3489 }; 3490 3491 int __init if6_proc_init(void) 3492 { 3493 return register_pernet_subsys(&if6_proc_net_ops); 3494 } 3495 3496 void if6_proc_exit(void) 3497 { 3498 unregister_pernet_subsys(&if6_proc_net_ops); 3499 } 3500 #endif /* CONFIG_PROC_FS */ 3501 3502 #if IS_ENABLED(CONFIG_IPV6_MIP6) 3503 /* Check if address is a home address configured on any interface. */ 3504 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr) 3505 { 3506 int ret = 0; 3507 struct inet6_ifaddr *ifp = NULL; 3508 unsigned int hash = inet6_addr_hash(addr); 3509 3510 rcu_read_lock_bh(); 3511 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) { 3512 if (!net_eq(dev_net(ifp->idev->dev), net)) 3513 continue; 3514 if (ipv6_addr_equal(&ifp->addr, addr) && 3515 (ifp->flags & IFA_F_HOMEADDRESS)) { 3516 ret = 1; 3517 break; 3518 } 3519 } 3520 rcu_read_unlock_bh(); 3521 return ret; 3522 } 3523 #endif 3524 3525 /* 3526 * Periodic address status verification 3527 */ 3528 3529 static void addrconf_verify(unsigned long foo) 3530 { 3531 unsigned long now, next, next_sec, next_sched; 3532 struct inet6_ifaddr *ifp; 3533 int i; 3534 3535 rcu_read_lock_bh(); 3536 spin_lock(&addrconf_verify_lock); 3537 now = jiffies; 3538 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY); 3539 3540 del_timer(&addr_chk_timer); 3541 3542 for (i = 0; i < IN6_ADDR_HSIZE; i++) { 3543 restart: 3544 hlist_for_each_entry_rcu_bh(ifp, 3545 &inet6_addr_lst[i], addr_lst) { 3546 unsigned long age; 3547 3548 if (ifp->flags & IFA_F_PERMANENT) 3549 continue; 3550 3551 spin_lock(&ifp->lock); 3552 /* We try to batch several events at once. */ 3553 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ; 3554 3555 if (ifp->valid_lft != INFINITY_LIFE_TIME && 3556 age >= ifp->valid_lft) { 3557 spin_unlock(&ifp->lock); 3558 in6_ifa_hold(ifp); 3559 ipv6_del_addr(ifp); 3560 goto restart; 3561 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) { 3562 spin_unlock(&ifp->lock); 3563 continue; 3564 } else if (age >= ifp->prefered_lft) { 3565 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */ 3566 int deprecate = 0; 3567 3568 if (!(ifp->flags&IFA_F_DEPRECATED)) { 3569 deprecate = 1; 3570 ifp->flags |= IFA_F_DEPRECATED; 3571 } 3572 3573 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next)) 3574 next = ifp->tstamp + ifp->valid_lft * HZ; 3575 3576 spin_unlock(&ifp->lock); 3577 3578 if (deprecate) { 3579 in6_ifa_hold(ifp); 3580 3581 ipv6_ifa_notify(0, ifp); 3582 in6_ifa_put(ifp); 3583 goto restart; 3584 } 3585 #ifdef CONFIG_IPV6_PRIVACY 3586 } else if ((ifp->flags&IFA_F_TEMPORARY) && 3587 !(ifp->flags&IFA_F_TENTATIVE)) { 3588 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry * 3589 ifp->idev->cnf.dad_transmits * 3590 ifp->idev->nd_parms->retrans_time / HZ; 3591 3592 if (age >= ifp->prefered_lft - regen_advance) { 3593 struct inet6_ifaddr *ifpub = ifp->ifpub; 3594 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 3595 next = ifp->tstamp + ifp->prefered_lft * HZ; 3596 if (!ifp->regen_count && ifpub) { 3597 ifp->regen_count++; 3598 in6_ifa_hold(ifp); 3599 in6_ifa_hold(ifpub); 3600 spin_unlock(&ifp->lock); 3601 3602 spin_lock(&ifpub->lock); 3603 ifpub->regen_count = 0; 3604 spin_unlock(&ifpub->lock); 3605 ipv6_create_tempaddr(ifpub, ifp); 3606 in6_ifa_put(ifpub); 3607 in6_ifa_put(ifp); 3608 goto restart; 3609 } 3610 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next)) 3611 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ; 3612 spin_unlock(&ifp->lock); 3613 #endif 3614 } else { 3615 /* ifp->prefered_lft <= ifp->valid_lft */ 3616 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 3617 next = ifp->tstamp + ifp->prefered_lft * HZ; 3618 spin_unlock(&ifp->lock); 3619 } 3620 } 3621 } 3622 3623 next_sec = round_jiffies_up(next); 3624 next_sched = next; 3625 3626 /* If rounded timeout is accurate enough, accept it. */ 3627 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ)) 3628 next_sched = next_sec; 3629 3630 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */ 3631 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX)) 3632 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX; 3633 3634 ADBG((KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n", 3635 now, next, next_sec, next_sched)); 3636 3637 addr_chk_timer.expires = next_sched; 3638 add_timer(&addr_chk_timer); 3639 spin_unlock(&addrconf_verify_lock); 3640 rcu_read_unlock_bh(); 3641 } 3642 3643 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local, 3644 struct in6_addr **peer_pfx) 3645 { 3646 struct in6_addr *pfx = NULL; 3647 3648 *peer_pfx = NULL; 3649 3650 if (addr) 3651 pfx = nla_data(addr); 3652 3653 if (local) { 3654 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx))) 3655 *peer_pfx = pfx; 3656 pfx = nla_data(local); 3657 } 3658 3659 return pfx; 3660 } 3661 3662 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = { 3663 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) }, 3664 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) }, 3665 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) }, 3666 }; 3667 3668 static int 3669 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh) 3670 { 3671 struct net *net = sock_net(skb->sk); 3672 struct ifaddrmsg *ifm; 3673 struct nlattr *tb[IFA_MAX+1]; 3674 struct in6_addr *pfx, *peer_pfx; 3675 int err; 3676 3677 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy); 3678 if (err < 0) 3679 return err; 3680 3681 ifm = nlmsg_data(nlh); 3682 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx); 3683 if (pfx == NULL) 3684 return -EINVAL; 3685 3686 return inet6_addr_del(net, ifm->ifa_index, pfx, ifm->ifa_prefixlen); 3687 } 3688 3689 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags, 3690 u32 prefered_lft, u32 valid_lft) 3691 { 3692 u32 flags; 3693 clock_t expires; 3694 unsigned long timeout; 3695 3696 if (!valid_lft || (prefered_lft > valid_lft)) 3697 return -EINVAL; 3698 3699 timeout = addrconf_timeout_fixup(valid_lft, HZ); 3700 if (addrconf_finite_timeout(timeout)) { 3701 expires = jiffies_to_clock_t(timeout * HZ); 3702 valid_lft = timeout; 3703 flags = RTF_EXPIRES; 3704 } else { 3705 expires = 0; 3706 flags = 0; 3707 ifa_flags |= IFA_F_PERMANENT; 3708 } 3709 3710 timeout = addrconf_timeout_fixup(prefered_lft, HZ); 3711 if (addrconf_finite_timeout(timeout)) { 3712 if (timeout == 0) 3713 ifa_flags |= IFA_F_DEPRECATED; 3714 prefered_lft = timeout; 3715 } 3716 3717 spin_lock_bh(&ifp->lock); 3718 ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags; 3719 ifp->tstamp = jiffies; 3720 ifp->valid_lft = valid_lft; 3721 ifp->prefered_lft = prefered_lft; 3722 3723 spin_unlock_bh(&ifp->lock); 3724 if (!(ifp->flags&IFA_F_TENTATIVE)) 3725 ipv6_ifa_notify(0, ifp); 3726 3727 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev, 3728 expires, flags); 3729 addrconf_verify(0); 3730 3731 return 0; 3732 } 3733 3734 static int 3735 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh) 3736 { 3737 struct net *net = sock_net(skb->sk); 3738 struct ifaddrmsg *ifm; 3739 struct nlattr *tb[IFA_MAX+1]; 3740 struct in6_addr *pfx, *peer_pfx; 3741 struct inet6_ifaddr *ifa; 3742 struct net_device *dev; 3743 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME; 3744 u8 ifa_flags; 3745 int err; 3746 3747 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy); 3748 if (err < 0) 3749 return err; 3750 3751 ifm = nlmsg_data(nlh); 3752 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx); 3753 if (pfx == NULL) 3754 return -EINVAL; 3755 3756 if (tb[IFA_CACHEINFO]) { 3757 struct ifa_cacheinfo *ci; 3758 3759 ci = nla_data(tb[IFA_CACHEINFO]); 3760 valid_lft = ci->ifa_valid; 3761 preferred_lft = ci->ifa_prefered; 3762 } else { 3763 preferred_lft = INFINITY_LIFE_TIME; 3764 valid_lft = INFINITY_LIFE_TIME; 3765 } 3766 3767 dev = __dev_get_by_index(net, ifm->ifa_index); 3768 if (dev == NULL) 3769 return -ENODEV; 3770 3771 /* We ignore other flags so far. */ 3772 ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS); 3773 3774 ifa = ipv6_get_ifaddr(net, pfx, dev, 1); 3775 if (ifa == NULL) { 3776 /* 3777 * It would be best to check for !NLM_F_CREATE here but 3778 * userspace alreay relies on not having to provide this. 3779 */ 3780 return inet6_addr_add(net, ifm->ifa_index, pfx, peer_pfx, 3781 ifm->ifa_prefixlen, ifa_flags, 3782 preferred_lft, valid_lft); 3783 } 3784 3785 if (nlh->nlmsg_flags & NLM_F_EXCL || 3786 !(nlh->nlmsg_flags & NLM_F_REPLACE)) 3787 err = -EEXIST; 3788 else 3789 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft); 3790 3791 in6_ifa_put(ifa); 3792 3793 return err; 3794 } 3795 3796 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags, 3797 u8 scope, int ifindex) 3798 { 3799 struct ifaddrmsg *ifm; 3800 3801 ifm = nlmsg_data(nlh); 3802 ifm->ifa_family = AF_INET6; 3803 ifm->ifa_prefixlen = prefixlen; 3804 ifm->ifa_flags = flags; 3805 ifm->ifa_scope = scope; 3806 ifm->ifa_index = ifindex; 3807 } 3808 3809 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp, 3810 unsigned long tstamp, u32 preferred, u32 valid) 3811 { 3812 struct ifa_cacheinfo ci; 3813 3814 ci.cstamp = cstamp_delta(cstamp); 3815 ci.tstamp = cstamp_delta(tstamp); 3816 ci.ifa_prefered = preferred; 3817 ci.ifa_valid = valid; 3818 3819 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci); 3820 } 3821 3822 static inline int rt_scope(int ifa_scope) 3823 { 3824 if (ifa_scope & IFA_HOST) 3825 return RT_SCOPE_HOST; 3826 else if (ifa_scope & IFA_LINK) 3827 return RT_SCOPE_LINK; 3828 else if (ifa_scope & IFA_SITE) 3829 return RT_SCOPE_SITE; 3830 else 3831 return RT_SCOPE_UNIVERSE; 3832 } 3833 3834 static inline int inet6_ifaddr_msgsize(void) 3835 { 3836 return NLMSG_ALIGN(sizeof(struct ifaddrmsg)) 3837 + nla_total_size(16) /* IFA_LOCAL */ 3838 + nla_total_size(16) /* IFA_ADDRESS */ 3839 + nla_total_size(sizeof(struct ifa_cacheinfo)); 3840 } 3841 3842 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa, 3843 u32 portid, u32 seq, int event, unsigned int flags) 3844 { 3845 struct nlmsghdr *nlh; 3846 u32 preferred, valid; 3847 3848 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags); 3849 if (nlh == NULL) 3850 return -EMSGSIZE; 3851 3852 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope), 3853 ifa->idev->dev->ifindex); 3854 3855 if (!(ifa->flags&IFA_F_PERMANENT)) { 3856 preferred = ifa->prefered_lft; 3857 valid = ifa->valid_lft; 3858 if (preferred != INFINITY_LIFE_TIME) { 3859 long tval = (jiffies - ifa->tstamp)/HZ; 3860 if (preferred > tval) 3861 preferred -= tval; 3862 else 3863 preferred = 0; 3864 if (valid != INFINITY_LIFE_TIME) { 3865 if (valid > tval) 3866 valid -= tval; 3867 else 3868 valid = 0; 3869 } 3870 } 3871 } else { 3872 preferred = INFINITY_LIFE_TIME; 3873 valid = INFINITY_LIFE_TIME; 3874 } 3875 3876 if (!ipv6_addr_any(&ifa->peer_addr)) { 3877 if (nla_put(skb, IFA_LOCAL, 16, &ifa->addr) < 0 || 3878 nla_put(skb, IFA_ADDRESS, 16, &ifa->peer_addr) < 0) 3879 goto error; 3880 } else 3881 if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0) 3882 goto error; 3883 3884 if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) 3885 goto error; 3886 3887 return nlmsg_end(skb, nlh); 3888 3889 error: 3890 nlmsg_cancel(skb, nlh); 3891 return -EMSGSIZE; 3892 } 3893 3894 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca, 3895 u32 portid, u32 seq, int event, u16 flags) 3896 { 3897 struct nlmsghdr *nlh; 3898 u8 scope = RT_SCOPE_UNIVERSE; 3899 int ifindex = ifmca->idev->dev->ifindex; 3900 3901 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE) 3902 scope = RT_SCOPE_SITE; 3903 3904 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags); 3905 if (nlh == NULL) 3906 return -EMSGSIZE; 3907 3908 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 3909 if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 || 3910 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp, 3911 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 3912 nlmsg_cancel(skb, nlh); 3913 return -EMSGSIZE; 3914 } 3915 3916 return nlmsg_end(skb, nlh); 3917 } 3918 3919 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca, 3920 u32 portid, u32 seq, int event, unsigned int flags) 3921 { 3922 struct nlmsghdr *nlh; 3923 u8 scope = RT_SCOPE_UNIVERSE; 3924 int ifindex = ifaca->aca_idev->dev->ifindex; 3925 3926 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE) 3927 scope = RT_SCOPE_SITE; 3928 3929 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags); 3930 if (nlh == NULL) 3931 return -EMSGSIZE; 3932 3933 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 3934 if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 || 3935 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp, 3936 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 3937 nlmsg_cancel(skb, nlh); 3938 return -EMSGSIZE; 3939 } 3940 3941 return nlmsg_end(skb, nlh); 3942 } 3943 3944 enum addr_type_t { 3945 UNICAST_ADDR, 3946 MULTICAST_ADDR, 3947 ANYCAST_ADDR, 3948 }; 3949 3950 /* called with rcu_read_lock() */ 3951 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb, 3952 struct netlink_callback *cb, enum addr_type_t type, 3953 int s_ip_idx, int *p_ip_idx) 3954 { 3955 struct ifmcaddr6 *ifmca; 3956 struct ifacaddr6 *ifaca; 3957 int err = 1; 3958 int ip_idx = *p_ip_idx; 3959 3960 read_lock_bh(&idev->lock); 3961 switch (type) { 3962 case UNICAST_ADDR: { 3963 struct inet6_ifaddr *ifa; 3964 3965 /* unicast address incl. temp addr */ 3966 list_for_each_entry(ifa, &idev->addr_list, if_list) { 3967 if (++ip_idx < s_ip_idx) 3968 continue; 3969 err = inet6_fill_ifaddr(skb, ifa, 3970 NETLINK_CB(cb->skb).portid, 3971 cb->nlh->nlmsg_seq, 3972 RTM_NEWADDR, 3973 NLM_F_MULTI); 3974 if (err <= 0) 3975 break; 3976 nl_dump_check_consistent(cb, nlmsg_hdr(skb)); 3977 } 3978 break; 3979 } 3980 case MULTICAST_ADDR: 3981 /* multicast address */ 3982 for (ifmca = idev->mc_list; ifmca; 3983 ifmca = ifmca->next, ip_idx++) { 3984 if (ip_idx < s_ip_idx) 3985 continue; 3986 err = inet6_fill_ifmcaddr(skb, ifmca, 3987 NETLINK_CB(cb->skb).portid, 3988 cb->nlh->nlmsg_seq, 3989 RTM_GETMULTICAST, 3990 NLM_F_MULTI); 3991 if (err <= 0) 3992 break; 3993 } 3994 break; 3995 case ANYCAST_ADDR: 3996 /* anycast address */ 3997 for (ifaca = idev->ac_list; ifaca; 3998 ifaca = ifaca->aca_next, ip_idx++) { 3999 if (ip_idx < s_ip_idx) 4000 continue; 4001 err = inet6_fill_ifacaddr(skb, ifaca, 4002 NETLINK_CB(cb->skb).portid, 4003 cb->nlh->nlmsg_seq, 4004 RTM_GETANYCAST, 4005 NLM_F_MULTI); 4006 if (err <= 0) 4007 break; 4008 } 4009 break; 4010 default: 4011 break; 4012 } 4013 read_unlock_bh(&idev->lock); 4014 *p_ip_idx = ip_idx; 4015 return err; 4016 } 4017 4018 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb, 4019 enum addr_type_t type) 4020 { 4021 struct net *net = sock_net(skb->sk); 4022 int h, s_h; 4023 int idx, ip_idx; 4024 int s_idx, s_ip_idx; 4025 struct net_device *dev; 4026 struct inet6_dev *idev; 4027 struct hlist_head *head; 4028 4029 s_h = cb->args[0]; 4030 s_idx = idx = cb->args[1]; 4031 s_ip_idx = ip_idx = cb->args[2]; 4032 4033 rcu_read_lock(); 4034 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ net->dev_base_seq; 4035 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 4036 idx = 0; 4037 head = &net->dev_index_head[h]; 4038 hlist_for_each_entry_rcu(dev, head, index_hlist) { 4039 if (idx < s_idx) 4040 goto cont; 4041 if (h > s_h || idx > s_idx) 4042 s_ip_idx = 0; 4043 ip_idx = 0; 4044 idev = __in6_dev_get(dev); 4045 if (!idev) 4046 goto cont; 4047 4048 if (in6_dump_addrs(idev, skb, cb, type, 4049 s_ip_idx, &ip_idx) <= 0) 4050 goto done; 4051 cont: 4052 idx++; 4053 } 4054 } 4055 done: 4056 rcu_read_unlock(); 4057 cb->args[0] = h; 4058 cb->args[1] = idx; 4059 cb->args[2] = ip_idx; 4060 4061 return skb->len; 4062 } 4063 4064 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb) 4065 { 4066 enum addr_type_t type = UNICAST_ADDR; 4067 4068 return inet6_dump_addr(skb, cb, type); 4069 } 4070 4071 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb) 4072 { 4073 enum addr_type_t type = MULTICAST_ADDR; 4074 4075 return inet6_dump_addr(skb, cb, type); 4076 } 4077 4078 4079 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb) 4080 { 4081 enum addr_type_t type = ANYCAST_ADDR; 4082 4083 return inet6_dump_addr(skb, cb, type); 4084 } 4085 4086 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh) 4087 { 4088 struct net *net = sock_net(in_skb->sk); 4089 struct ifaddrmsg *ifm; 4090 struct nlattr *tb[IFA_MAX+1]; 4091 struct in6_addr *addr = NULL, *peer; 4092 struct net_device *dev = NULL; 4093 struct inet6_ifaddr *ifa; 4094 struct sk_buff *skb; 4095 int err; 4096 4097 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy); 4098 if (err < 0) 4099 goto errout; 4100 4101 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer); 4102 if (addr == NULL) { 4103 err = -EINVAL; 4104 goto errout; 4105 } 4106 4107 ifm = nlmsg_data(nlh); 4108 if (ifm->ifa_index) 4109 dev = __dev_get_by_index(net, ifm->ifa_index); 4110 4111 ifa = ipv6_get_ifaddr(net, addr, dev, 1); 4112 if (!ifa) { 4113 err = -EADDRNOTAVAIL; 4114 goto errout; 4115 } 4116 4117 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL); 4118 if (!skb) { 4119 err = -ENOBUFS; 4120 goto errout_ifa; 4121 } 4122 4123 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).portid, 4124 nlh->nlmsg_seq, RTM_NEWADDR, 0); 4125 if (err < 0) { 4126 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 4127 WARN_ON(err == -EMSGSIZE); 4128 kfree_skb(skb); 4129 goto errout_ifa; 4130 } 4131 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid); 4132 errout_ifa: 4133 in6_ifa_put(ifa); 4134 errout: 4135 return err; 4136 } 4137 4138 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa) 4139 { 4140 struct sk_buff *skb; 4141 struct net *net = dev_net(ifa->idev->dev); 4142 int err = -ENOBUFS; 4143 4144 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC); 4145 if (skb == NULL) 4146 goto errout; 4147 4148 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0); 4149 if (err < 0) { 4150 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 4151 WARN_ON(err == -EMSGSIZE); 4152 kfree_skb(skb); 4153 goto errout; 4154 } 4155 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC); 4156 return; 4157 errout: 4158 if (err < 0) 4159 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err); 4160 } 4161 4162 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf, 4163 __s32 *array, int bytes) 4164 { 4165 BUG_ON(bytes < (DEVCONF_MAX * 4)); 4166 4167 memset(array, 0, bytes); 4168 array[DEVCONF_FORWARDING] = cnf->forwarding; 4169 array[DEVCONF_HOPLIMIT] = cnf->hop_limit; 4170 array[DEVCONF_MTU6] = cnf->mtu6; 4171 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra; 4172 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects; 4173 array[DEVCONF_AUTOCONF] = cnf->autoconf; 4174 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits; 4175 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits; 4176 array[DEVCONF_RTR_SOLICIT_INTERVAL] = 4177 jiffies_to_msecs(cnf->rtr_solicit_interval); 4178 array[DEVCONF_RTR_SOLICIT_DELAY] = 4179 jiffies_to_msecs(cnf->rtr_solicit_delay); 4180 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version; 4181 #ifdef CONFIG_IPV6_PRIVACY 4182 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr; 4183 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft; 4184 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft; 4185 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry; 4186 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor; 4187 #endif 4188 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses; 4189 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr; 4190 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo; 4191 #ifdef CONFIG_IPV6_ROUTER_PREF 4192 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref; 4193 array[DEVCONF_RTR_PROBE_INTERVAL] = 4194 jiffies_to_msecs(cnf->rtr_probe_interval); 4195 #ifdef CONFIG_IPV6_ROUTE_INFO 4196 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen; 4197 #endif 4198 #endif 4199 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp; 4200 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route; 4201 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 4202 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad; 4203 #endif 4204 #ifdef CONFIG_IPV6_MROUTE 4205 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding; 4206 #endif 4207 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6; 4208 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad; 4209 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao; 4210 array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify; 4211 } 4212 4213 static inline size_t inet6_ifla6_size(void) 4214 { 4215 return nla_total_size(4) /* IFLA_INET6_FLAGS */ 4216 + nla_total_size(sizeof(struct ifla_cacheinfo)) 4217 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */ 4218 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */ 4219 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */ 4220 + nla_total_size(sizeof(struct in6_addr)); /* IFLA_INET6_TOKEN */ 4221 } 4222 4223 static inline size_t inet6_if_nlmsg_size(void) 4224 { 4225 return NLMSG_ALIGN(sizeof(struct ifinfomsg)) 4226 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */ 4227 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */ 4228 + nla_total_size(4) /* IFLA_MTU */ 4229 + nla_total_size(4) /* IFLA_LINK */ 4230 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */ 4231 } 4232 4233 static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib, 4234 int items, int bytes) 4235 { 4236 int i; 4237 int pad = bytes - sizeof(u64) * items; 4238 BUG_ON(pad < 0); 4239 4240 /* Use put_unaligned() because stats may not be aligned for u64. */ 4241 put_unaligned(items, &stats[0]); 4242 for (i = 1; i < items; i++) 4243 put_unaligned(atomic_long_read(&mib[i]), &stats[i]); 4244 4245 memset(&stats[items], 0, pad); 4246 } 4247 4248 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu **mib, 4249 int items, int bytes, size_t syncpoff) 4250 { 4251 int i; 4252 int pad = bytes - sizeof(u64) * items; 4253 BUG_ON(pad < 0); 4254 4255 /* Use put_unaligned() because stats may not be aligned for u64. */ 4256 put_unaligned(items, &stats[0]); 4257 for (i = 1; i < items; i++) 4258 put_unaligned(snmp_fold_field64(mib, i, syncpoff), &stats[i]); 4259 4260 memset(&stats[items], 0, pad); 4261 } 4262 4263 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype, 4264 int bytes) 4265 { 4266 switch (attrtype) { 4267 case IFLA_INET6_STATS: 4268 __snmp6_fill_stats64(stats, (void __percpu **)idev->stats.ipv6, 4269 IPSTATS_MIB_MAX, bytes, offsetof(struct ipstats_mib, syncp)); 4270 break; 4271 case IFLA_INET6_ICMP6STATS: 4272 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, ICMP6_MIB_MAX, bytes); 4273 break; 4274 } 4275 } 4276 4277 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev) 4278 { 4279 struct nlattr *nla; 4280 struct ifla_cacheinfo ci; 4281 4282 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags)) 4283 goto nla_put_failure; 4284 ci.max_reasm_len = IPV6_MAXPLEN; 4285 ci.tstamp = cstamp_delta(idev->tstamp); 4286 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time); 4287 ci.retrans_time = jiffies_to_msecs(idev->nd_parms->retrans_time); 4288 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci)) 4289 goto nla_put_failure; 4290 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32)); 4291 if (nla == NULL) 4292 goto nla_put_failure; 4293 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla)); 4294 4295 /* XXX - MC not implemented */ 4296 4297 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64)); 4298 if (nla == NULL) 4299 goto nla_put_failure; 4300 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla)); 4301 4302 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64)); 4303 if (nla == NULL) 4304 goto nla_put_failure; 4305 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla)); 4306 4307 nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr)); 4308 if (nla == NULL) 4309 goto nla_put_failure; 4310 read_lock_bh(&idev->lock); 4311 memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla)); 4312 read_unlock_bh(&idev->lock); 4313 4314 return 0; 4315 4316 nla_put_failure: 4317 return -EMSGSIZE; 4318 } 4319 4320 static size_t inet6_get_link_af_size(const struct net_device *dev) 4321 { 4322 if (!__in6_dev_get(dev)) 4323 return 0; 4324 4325 return inet6_ifla6_size(); 4326 } 4327 4328 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev) 4329 { 4330 struct inet6_dev *idev = __in6_dev_get(dev); 4331 4332 if (!idev) 4333 return -ENODATA; 4334 4335 if (inet6_fill_ifla6_attrs(skb, idev) < 0) 4336 return -EMSGSIZE; 4337 4338 return 0; 4339 } 4340 4341 static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token) 4342 { 4343 struct inet6_ifaddr *ifp; 4344 struct net_device *dev = idev->dev; 4345 bool update_rs = false; 4346 struct in6_addr ll_addr; 4347 4348 if (token == NULL) 4349 return -EINVAL; 4350 if (ipv6_addr_any(token)) 4351 return -EINVAL; 4352 if (dev->flags & (IFF_LOOPBACK | IFF_NOARP)) 4353 return -EINVAL; 4354 if (!ipv6_accept_ra(idev)) 4355 return -EINVAL; 4356 if (idev->cnf.rtr_solicits <= 0) 4357 return -EINVAL; 4358 4359 write_lock_bh(&idev->lock); 4360 4361 BUILD_BUG_ON(sizeof(token->s6_addr) != 16); 4362 memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8); 4363 4364 write_unlock_bh(&idev->lock); 4365 4366 if (!idev->dead && (idev->if_flags & IF_READY) && 4367 !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE | 4368 IFA_F_OPTIMISTIC)) { 4369 4370 /* If we're not ready, then normal ifup will take care 4371 * of this. Otherwise, we need to request our rs here. 4372 */ 4373 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters); 4374 update_rs = true; 4375 } 4376 4377 write_lock_bh(&idev->lock); 4378 4379 if (update_rs) { 4380 idev->if_flags |= IF_RS_SENT; 4381 idev->rs_probes = 1; 4382 addrconf_mod_rs_timer(idev, idev->cnf.rtr_solicit_interval); 4383 } 4384 4385 /* Well, that's kinda nasty ... */ 4386 list_for_each_entry(ifp, &idev->addr_list, if_list) { 4387 spin_lock(&ifp->lock); 4388 if (ifp->tokenized) { 4389 ifp->valid_lft = 0; 4390 ifp->prefered_lft = 0; 4391 } 4392 spin_unlock(&ifp->lock); 4393 } 4394 4395 write_unlock_bh(&idev->lock); 4396 addrconf_verify(0); 4397 return 0; 4398 } 4399 4400 static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla) 4401 { 4402 int err = -EINVAL; 4403 struct inet6_dev *idev = __in6_dev_get(dev); 4404 struct nlattr *tb[IFLA_INET6_MAX + 1]; 4405 4406 if (!idev) 4407 return -EAFNOSUPPORT; 4408 4409 if (nla_parse_nested(tb, IFLA_INET6_MAX, nla, NULL) < 0) 4410 BUG(); 4411 4412 if (tb[IFLA_INET6_TOKEN]) 4413 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN])); 4414 4415 return err; 4416 } 4417 4418 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev, 4419 u32 portid, u32 seq, int event, unsigned int flags) 4420 { 4421 struct net_device *dev = idev->dev; 4422 struct ifinfomsg *hdr; 4423 struct nlmsghdr *nlh; 4424 void *protoinfo; 4425 4426 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags); 4427 if (nlh == NULL) 4428 return -EMSGSIZE; 4429 4430 hdr = nlmsg_data(nlh); 4431 hdr->ifi_family = AF_INET6; 4432 hdr->__ifi_pad = 0; 4433 hdr->ifi_type = dev->type; 4434 hdr->ifi_index = dev->ifindex; 4435 hdr->ifi_flags = dev_get_flags(dev); 4436 hdr->ifi_change = 0; 4437 4438 if (nla_put_string(skb, IFLA_IFNAME, dev->name) || 4439 (dev->addr_len && 4440 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) || 4441 nla_put_u32(skb, IFLA_MTU, dev->mtu) || 4442 (dev->ifindex != dev->iflink && 4443 nla_put_u32(skb, IFLA_LINK, dev->iflink))) 4444 goto nla_put_failure; 4445 protoinfo = nla_nest_start(skb, IFLA_PROTINFO); 4446 if (protoinfo == NULL) 4447 goto nla_put_failure; 4448 4449 if (inet6_fill_ifla6_attrs(skb, idev) < 0) 4450 goto nla_put_failure; 4451 4452 nla_nest_end(skb, protoinfo); 4453 return nlmsg_end(skb, nlh); 4454 4455 nla_put_failure: 4456 nlmsg_cancel(skb, nlh); 4457 return -EMSGSIZE; 4458 } 4459 4460 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb) 4461 { 4462 struct net *net = sock_net(skb->sk); 4463 int h, s_h; 4464 int idx = 0, s_idx; 4465 struct net_device *dev; 4466 struct inet6_dev *idev; 4467 struct hlist_head *head; 4468 4469 s_h = cb->args[0]; 4470 s_idx = cb->args[1]; 4471 4472 rcu_read_lock(); 4473 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 4474 idx = 0; 4475 head = &net->dev_index_head[h]; 4476 hlist_for_each_entry_rcu(dev, head, index_hlist) { 4477 if (idx < s_idx) 4478 goto cont; 4479 idev = __in6_dev_get(dev); 4480 if (!idev) 4481 goto cont; 4482 if (inet6_fill_ifinfo(skb, idev, 4483 NETLINK_CB(cb->skb).portid, 4484 cb->nlh->nlmsg_seq, 4485 RTM_NEWLINK, NLM_F_MULTI) <= 0) 4486 goto out; 4487 cont: 4488 idx++; 4489 } 4490 } 4491 out: 4492 rcu_read_unlock(); 4493 cb->args[1] = idx; 4494 cb->args[0] = h; 4495 4496 return skb->len; 4497 } 4498 4499 void inet6_ifinfo_notify(int event, struct inet6_dev *idev) 4500 { 4501 struct sk_buff *skb; 4502 struct net *net = dev_net(idev->dev); 4503 int err = -ENOBUFS; 4504 4505 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC); 4506 if (skb == NULL) 4507 goto errout; 4508 4509 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0); 4510 if (err < 0) { 4511 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */ 4512 WARN_ON(err == -EMSGSIZE); 4513 kfree_skb(skb); 4514 goto errout; 4515 } 4516 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC); 4517 return; 4518 errout: 4519 if (err < 0) 4520 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err); 4521 } 4522 4523 static inline size_t inet6_prefix_nlmsg_size(void) 4524 { 4525 return NLMSG_ALIGN(sizeof(struct prefixmsg)) 4526 + nla_total_size(sizeof(struct in6_addr)) 4527 + nla_total_size(sizeof(struct prefix_cacheinfo)); 4528 } 4529 4530 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev, 4531 struct prefix_info *pinfo, u32 portid, u32 seq, 4532 int event, unsigned int flags) 4533 { 4534 struct prefixmsg *pmsg; 4535 struct nlmsghdr *nlh; 4536 struct prefix_cacheinfo ci; 4537 4538 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags); 4539 if (nlh == NULL) 4540 return -EMSGSIZE; 4541 4542 pmsg = nlmsg_data(nlh); 4543 pmsg->prefix_family = AF_INET6; 4544 pmsg->prefix_pad1 = 0; 4545 pmsg->prefix_pad2 = 0; 4546 pmsg->prefix_ifindex = idev->dev->ifindex; 4547 pmsg->prefix_len = pinfo->prefix_len; 4548 pmsg->prefix_type = pinfo->type; 4549 pmsg->prefix_pad3 = 0; 4550 pmsg->prefix_flags = 0; 4551 if (pinfo->onlink) 4552 pmsg->prefix_flags |= IF_PREFIX_ONLINK; 4553 if (pinfo->autoconf) 4554 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF; 4555 4556 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix)) 4557 goto nla_put_failure; 4558 ci.preferred_time = ntohl(pinfo->prefered); 4559 ci.valid_time = ntohl(pinfo->valid); 4560 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci)) 4561 goto nla_put_failure; 4562 return nlmsg_end(skb, nlh); 4563 4564 nla_put_failure: 4565 nlmsg_cancel(skb, nlh); 4566 return -EMSGSIZE; 4567 } 4568 4569 static void inet6_prefix_notify(int event, struct inet6_dev *idev, 4570 struct prefix_info *pinfo) 4571 { 4572 struct sk_buff *skb; 4573 struct net *net = dev_net(idev->dev); 4574 int err = -ENOBUFS; 4575 4576 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC); 4577 if (skb == NULL) 4578 goto errout; 4579 4580 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0); 4581 if (err < 0) { 4582 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */ 4583 WARN_ON(err == -EMSGSIZE); 4584 kfree_skb(skb); 4585 goto errout; 4586 } 4587 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC); 4588 return; 4589 errout: 4590 if (err < 0) 4591 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err); 4592 } 4593 4594 static void update_valid_ll_addr_cnt(struct inet6_ifaddr *ifp, int count) 4595 { 4596 write_lock_bh(&ifp->idev->lock); 4597 spin_lock(&ifp->lock); 4598 if (((ifp->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE|IFA_F_OPTIMISTIC| 4599 IFA_F_DADFAILED)) == IFA_F_PERMANENT) && 4600 (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) 4601 ifp->idev->valid_ll_addr_cnt += count; 4602 WARN_ON(ifp->idev->valid_ll_addr_cnt < 0); 4603 spin_unlock(&ifp->lock); 4604 write_unlock_bh(&ifp->idev->lock); 4605 } 4606 4607 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 4608 { 4609 struct net *net = dev_net(ifp->idev->dev); 4610 4611 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp); 4612 4613 switch (event) { 4614 case RTM_NEWADDR: 4615 update_valid_ll_addr_cnt(ifp, 1); 4616 4617 /* 4618 * If the address was optimistic 4619 * we inserted the route at the start of 4620 * our DAD process, so we don't need 4621 * to do it again 4622 */ 4623 if (!(ifp->rt->rt6i_node)) 4624 ip6_ins_rt(ifp->rt); 4625 if (ifp->idev->cnf.forwarding) 4626 addrconf_join_anycast(ifp); 4627 if (!ipv6_addr_any(&ifp->peer_addr)) 4628 addrconf_prefix_route(&ifp->peer_addr, 128, 4629 ifp->idev->dev, 0, 0); 4630 break; 4631 case RTM_DELADDR: 4632 update_valid_ll_addr_cnt(ifp, -1); 4633 4634 if (ifp->idev->cnf.forwarding) 4635 addrconf_leave_anycast(ifp); 4636 addrconf_leave_solict(ifp->idev, &ifp->addr); 4637 if (!ipv6_addr_any(&ifp->peer_addr)) { 4638 struct rt6_info *rt; 4639 struct net_device *dev = ifp->idev->dev; 4640 4641 rt = rt6_lookup(dev_net(dev), &ifp->peer_addr, NULL, 4642 dev->ifindex, 1); 4643 if (rt) { 4644 dst_hold(&rt->dst); 4645 if (ip6_del_rt(rt)) 4646 dst_free(&rt->dst); 4647 } 4648 } 4649 dst_hold(&ifp->rt->dst); 4650 4651 if (ip6_del_rt(ifp->rt)) 4652 dst_free(&ifp->rt->dst); 4653 break; 4654 } 4655 atomic_inc(&net->ipv6.dev_addr_genid); 4656 } 4657 4658 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 4659 { 4660 rcu_read_lock_bh(); 4661 if (likely(ifp->idev->dead == 0)) 4662 __ipv6_ifa_notify(event, ifp); 4663 rcu_read_unlock_bh(); 4664 } 4665 4666 #ifdef CONFIG_SYSCTL 4667 4668 static 4669 int addrconf_sysctl_forward(struct ctl_table *ctl, int write, 4670 void __user *buffer, size_t *lenp, loff_t *ppos) 4671 { 4672 int *valp = ctl->data; 4673 int val = *valp; 4674 loff_t pos = *ppos; 4675 struct ctl_table lctl; 4676 int ret; 4677 4678 /* 4679 * ctl->data points to idev->cnf.forwarding, we should 4680 * not modify it until we get the rtnl lock. 4681 */ 4682 lctl = *ctl; 4683 lctl.data = &val; 4684 4685 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 4686 4687 if (write) 4688 ret = addrconf_fixup_forwarding(ctl, valp, val); 4689 if (ret) 4690 *ppos = pos; 4691 return ret; 4692 } 4693 4694 static void dev_disable_change(struct inet6_dev *idev) 4695 { 4696 struct netdev_notifier_info info; 4697 4698 if (!idev || !idev->dev) 4699 return; 4700 4701 netdev_notifier_info_init(&info, idev->dev); 4702 if (idev->cnf.disable_ipv6) 4703 addrconf_notify(NULL, NETDEV_DOWN, &info); 4704 else 4705 addrconf_notify(NULL, NETDEV_UP, &info); 4706 } 4707 4708 static void addrconf_disable_change(struct net *net, __s32 newf) 4709 { 4710 struct net_device *dev; 4711 struct inet6_dev *idev; 4712 4713 rcu_read_lock(); 4714 for_each_netdev_rcu(net, dev) { 4715 idev = __in6_dev_get(dev); 4716 if (idev) { 4717 int changed = (!idev->cnf.disable_ipv6) ^ (!newf); 4718 idev->cnf.disable_ipv6 = newf; 4719 if (changed) 4720 dev_disable_change(idev); 4721 } 4722 } 4723 rcu_read_unlock(); 4724 } 4725 4726 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf) 4727 { 4728 struct net *net; 4729 int old; 4730 4731 if (!rtnl_trylock()) 4732 return restart_syscall(); 4733 4734 net = (struct net *)table->extra2; 4735 old = *p; 4736 *p = newf; 4737 4738 if (p == &net->ipv6.devconf_dflt->disable_ipv6) { 4739 rtnl_unlock(); 4740 return 0; 4741 } 4742 4743 if (p == &net->ipv6.devconf_all->disable_ipv6) { 4744 net->ipv6.devconf_dflt->disable_ipv6 = newf; 4745 addrconf_disable_change(net, newf); 4746 } else if ((!newf) ^ (!old)) 4747 dev_disable_change((struct inet6_dev *)table->extra1); 4748 4749 rtnl_unlock(); 4750 return 0; 4751 } 4752 4753 static 4754 int addrconf_sysctl_disable(struct ctl_table *ctl, int write, 4755 void __user *buffer, size_t *lenp, loff_t *ppos) 4756 { 4757 int *valp = ctl->data; 4758 int val = *valp; 4759 loff_t pos = *ppos; 4760 struct ctl_table lctl; 4761 int ret; 4762 4763 /* 4764 * ctl->data points to idev->cnf.disable_ipv6, we should 4765 * not modify it until we get the rtnl lock. 4766 */ 4767 lctl = *ctl; 4768 lctl.data = &val; 4769 4770 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 4771 4772 if (write) 4773 ret = addrconf_disable_ipv6(ctl, valp, val); 4774 if (ret) 4775 *ppos = pos; 4776 return ret; 4777 } 4778 4779 static struct addrconf_sysctl_table 4780 { 4781 struct ctl_table_header *sysctl_header; 4782 struct ctl_table addrconf_vars[DEVCONF_MAX+1]; 4783 } addrconf_sysctl __read_mostly = { 4784 .sysctl_header = NULL, 4785 .addrconf_vars = { 4786 { 4787 .procname = "forwarding", 4788 .data = &ipv6_devconf.forwarding, 4789 .maxlen = sizeof(int), 4790 .mode = 0644, 4791 .proc_handler = addrconf_sysctl_forward, 4792 }, 4793 { 4794 .procname = "hop_limit", 4795 .data = &ipv6_devconf.hop_limit, 4796 .maxlen = sizeof(int), 4797 .mode = 0644, 4798 .proc_handler = proc_dointvec, 4799 }, 4800 { 4801 .procname = "mtu", 4802 .data = &ipv6_devconf.mtu6, 4803 .maxlen = sizeof(int), 4804 .mode = 0644, 4805 .proc_handler = proc_dointvec, 4806 }, 4807 { 4808 .procname = "accept_ra", 4809 .data = &ipv6_devconf.accept_ra, 4810 .maxlen = sizeof(int), 4811 .mode = 0644, 4812 .proc_handler = proc_dointvec, 4813 }, 4814 { 4815 .procname = "accept_redirects", 4816 .data = &ipv6_devconf.accept_redirects, 4817 .maxlen = sizeof(int), 4818 .mode = 0644, 4819 .proc_handler = proc_dointvec, 4820 }, 4821 { 4822 .procname = "autoconf", 4823 .data = &ipv6_devconf.autoconf, 4824 .maxlen = sizeof(int), 4825 .mode = 0644, 4826 .proc_handler = proc_dointvec, 4827 }, 4828 { 4829 .procname = "dad_transmits", 4830 .data = &ipv6_devconf.dad_transmits, 4831 .maxlen = sizeof(int), 4832 .mode = 0644, 4833 .proc_handler = proc_dointvec, 4834 }, 4835 { 4836 .procname = "router_solicitations", 4837 .data = &ipv6_devconf.rtr_solicits, 4838 .maxlen = sizeof(int), 4839 .mode = 0644, 4840 .proc_handler = proc_dointvec, 4841 }, 4842 { 4843 .procname = "router_solicitation_interval", 4844 .data = &ipv6_devconf.rtr_solicit_interval, 4845 .maxlen = sizeof(int), 4846 .mode = 0644, 4847 .proc_handler = proc_dointvec_jiffies, 4848 }, 4849 { 4850 .procname = "router_solicitation_delay", 4851 .data = &ipv6_devconf.rtr_solicit_delay, 4852 .maxlen = sizeof(int), 4853 .mode = 0644, 4854 .proc_handler = proc_dointvec_jiffies, 4855 }, 4856 { 4857 .procname = "force_mld_version", 4858 .data = &ipv6_devconf.force_mld_version, 4859 .maxlen = sizeof(int), 4860 .mode = 0644, 4861 .proc_handler = proc_dointvec, 4862 }, 4863 #ifdef CONFIG_IPV6_PRIVACY 4864 { 4865 .procname = "use_tempaddr", 4866 .data = &ipv6_devconf.use_tempaddr, 4867 .maxlen = sizeof(int), 4868 .mode = 0644, 4869 .proc_handler = proc_dointvec, 4870 }, 4871 { 4872 .procname = "temp_valid_lft", 4873 .data = &ipv6_devconf.temp_valid_lft, 4874 .maxlen = sizeof(int), 4875 .mode = 0644, 4876 .proc_handler = proc_dointvec, 4877 }, 4878 { 4879 .procname = "temp_prefered_lft", 4880 .data = &ipv6_devconf.temp_prefered_lft, 4881 .maxlen = sizeof(int), 4882 .mode = 0644, 4883 .proc_handler = proc_dointvec, 4884 }, 4885 { 4886 .procname = "regen_max_retry", 4887 .data = &ipv6_devconf.regen_max_retry, 4888 .maxlen = sizeof(int), 4889 .mode = 0644, 4890 .proc_handler = proc_dointvec, 4891 }, 4892 { 4893 .procname = "max_desync_factor", 4894 .data = &ipv6_devconf.max_desync_factor, 4895 .maxlen = sizeof(int), 4896 .mode = 0644, 4897 .proc_handler = proc_dointvec, 4898 }, 4899 #endif 4900 { 4901 .procname = "max_addresses", 4902 .data = &ipv6_devconf.max_addresses, 4903 .maxlen = sizeof(int), 4904 .mode = 0644, 4905 .proc_handler = proc_dointvec, 4906 }, 4907 { 4908 .procname = "accept_ra_defrtr", 4909 .data = &ipv6_devconf.accept_ra_defrtr, 4910 .maxlen = sizeof(int), 4911 .mode = 0644, 4912 .proc_handler = proc_dointvec, 4913 }, 4914 { 4915 .procname = "accept_ra_pinfo", 4916 .data = &ipv6_devconf.accept_ra_pinfo, 4917 .maxlen = sizeof(int), 4918 .mode = 0644, 4919 .proc_handler = proc_dointvec, 4920 }, 4921 #ifdef CONFIG_IPV6_ROUTER_PREF 4922 { 4923 .procname = "accept_ra_rtr_pref", 4924 .data = &ipv6_devconf.accept_ra_rtr_pref, 4925 .maxlen = sizeof(int), 4926 .mode = 0644, 4927 .proc_handler = proc_dointvec, 4928 }, 4929 { 4930 .procname = "router_probe_interval", 4931 .data = &ipv6_devconf.rtr_probe_interval, 4932 .maxlen = sizeof(int), 4933 .mode = 0644, 4934 .proc_handler = proc_dointvec_jiffies, 4935 }, 4936 #ifdef CONFIG_IPV6_ROUTE_INFO 4937 { 4938 .procname = "accept_ra_rt_info_max_plen", 4939 .data = &ipv6_devconf.accept_ra_rt_info_max_plen, 4940 .maxlen = sizeof(int), 4941 .mode = 0644, 4942 .proc_handler = proc_dointvec, 4943 }, 4944 #endif 4945 #endif 4946 { 4947 .procname = "proxy_ndp", 4948 .data = &ipv6_devconf.proxy_ndp, 4949 .maxlen = sizeof(int), 4950 .mode = 0644, 4951 .proc_handler = proc_dointvec, 4952 }, 4953 { 4954 .procname = "accept_source_route", 4955 .data = &ipv6_devconf.accept_source_route, 4956 .maxlen = sizeof(int), 4957 .mode = 0644, 4958 .proc_handler = proc_dointvec, 4959 }, 4960 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 4961 { 4962 .procname = "optimistic_dad", 4963 .data = &ipv6_devconf.optimistic_dad, 4964 .maxlen = sizeof(int), 4965 .mode = 0644, 4966 .proc_handler = proc_dointvec, 4967 4968 }, 4969 #endif 4970 #ifdef CONFIG_IPV6_MROUTE 4971 { 4972 .procname = "mc_forwarding", 4973 .data = &ipv6_devconf.mc_forwarding, 4974 .maxlen = sizeof(int), 4975 .mode = 0444, 4976 .proc_handler = proc_dointvec, 4977 }, 4978 #endif 4979 { 4980 .procname = "disable_ipv6", 4981 .data = &ipv6_devconf.disable_ipv6, 4982 .maxlen = sizeof(int), 4983 .mode = 0644, 4984 .proc_handler = addrconf_sysctl_disable, 4985 }, 4986 { 4987 .procname = "accept_dad", 4988 .data = &ipv6_devconf.accept_dad, 4989 .maxlen = sizeof(int), 4990 .mode = 0644, 4991 .proc_handler = proc_dointvec, 4992 }, 4993 { 4994 .procname = "force_tllao", 4995 .data = &ipv6_devconf.force_tllao, 4996 .maxlen = sizeof(int), 4997 .mode = 0644, 4998 .proc_handler = proc_dointvec 4999 }, 5000 { 5001 .procname = "ndisc_notify", 5002 .data = &ipv6_devconf.ndisc_notify, 5003 .maxlen = sizeof(int), 5004 .mode = 0644, 5005 .proc_handler = proc_dointvec 5006 }, 5007 { 5008 /* sentinel */ 5009 } 5010 }, 5011 }; 5012 5013 static int __addrconf_sysctl_register(struct net *net, char *dev_name, 5014 struct inet6_dev *idev, struct ipv6_devconf *p) 5015 { 5016 int i; 5017 struct addrconf_sysctl_table *t; 5018 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ]; 5019 5020 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL); 5021 if (t == NULL) 5022 goto out; 5023 5024 for (i = 0; t->addrconf_vars[i].data; i++) { 5025 t->addrconf_vars[i].data += (char *)p - (char *)&ipv6_devconf; 5026 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */ 5027 t->addrconf_vars[i].extra2 = net; 5028 } 5029 5030 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name); 5031 5032 t->sysctl_header = register_net_sysctl(net, path, t->addrconf_vars); 5033 if (t->sysctl_header == NULL) 5034 goto free; 5035 5036 p->sysctl = t; 5037 return 0; 5038 5039 free: 5040 kfree(t); 5041 out: 5042 return -ENOBUFS; 5043 } 5044 5045 static void __addrconf_sysctl_unregister(struct ipv6_devconf *p) 5046 { 5047 struct addrconf_sysctl_table *t; 5048 5049 if (p->sysctl == NULL) 5050 return; 5051 5052 t = p->sysctl; 5053 p->sysctl = NULL; 5054 unregister_net_sysctl_table(t->sysctl_header); 5055 kfree(t); 5056 } 5057 5058 static void addrconf_sysctl_register(struct inet6_dev *idev) 5059 { 5060 neigh_sysctl_register(idev->dev, idev->nd_parms, "ipv6", 5061 &ndisc_ifinfo_sysctl_change); 5062 __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name, 5063 idev, &idev->cnf); 5064 } 5065 5066 static void addrconf_sysctl_unregister(struct inet6_dev *idev) 5067 { 5068 __addrconf_sysctl_unregister(&idev->cnf); 5069 neigh_sysctl_unregister(idev->nd_parms); 5070 } 5071 5072 5073 #endif 5074 5075 static int __net_init addrconf_init_net(struct net *net) 5076 { 5077 int err = -ENOMEM; 5078 struct ipv6_devconf *all, *dflt; 5079 5080 all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL); 5081 if (all == NULL) 5082 goto err_alloc_all; 5083 5084 dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL); 5085 if (dflt == NULL) 5086 goto err_alloc_dflt; 5087 5088 /* these will be inherited by all namespaces */ 5089 dflt->autoconf = ipv6_defaults.autoconf; 5090 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6; 5091 5092 net->ipv6.devconf_all = all; 5093 net->ipv6.devconf_dflt = dflt; 5094 5095 #ifdef CONFIG_SYSCTL 5096 err = __addrconf_sysctl_register(net, "all", NULL, all); 5097 if (err < 0) 5098 goto err_reg_all; 5099 5100 err = __addrconf_sysctl_register(net, "default", NULL, dflt); 5101 if (err < 0) 5102 goto err_reg_dflt; 5103 #endif 5104 return 0; 5105 5106 #ifdef CONFIG_SYSCTL 5107 err_reg_dflt: 5108 __addrconf_sysctl_unregister(all); 5109 err_reg_all: 5110 kfree(dflt); 5111 #endif 5112 err_alloc_dflt: 5113 kfree(all); 5114 err_alloc_all: 5115 return err; 5116 } 5117 5118 static void __net_exit addrconf_exit_net(struct net *net) 5119 { 5120 #ifdef CONFIG_SYSCTL 5121 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt); 5122 __addrconf_sysctl_unregister(net->ipv6.devconf_all); 5123 #endif 5124 if (!net_eq(net, &init_net)) { 5125 kfree(net->ipv6.devconf_dflt); 5126 kfree(net->ipv6.devconf_all); 5127 } 5128 } 5129 5130 static struct pernet_operations addrconf_ops = { 5131 .init = addrconf_init_net, 5132 .exit = addrconf_exit_net, 5133 }; 5134 5135 static struct rtnl_af_ops inet6_ops = { 5136 .family = AF_INET6, 5137 .fill_link_af = inet6_fill_link_af, 5138 .get_link_af_size = inet6_get_link_af_size, 5139 .set_link_af = inet6_set_link_af, 5140 }; 5141 5142 /* 5143 * Init / cleanup code 5144 */ 5145 5146 int __init addrconf_init(void) 5147 { 5148 int i, err; 5149 5150 err = ipv6_addr_label_init(); 5151 if (err < 0) { 5152 pr_crit("%s: cannot initialize default policy table: %d\n", 5153 __func__, err); 5154 goto out; 5155 } 5156 5157 err = register_pernet_subsys(&addrconf_ops); 5158 if (err < 0) 5159 goto out_addrlabel; 5160 5161 /* The addrconf netdev notifier requires that loopback_dev 5162 * has it's ipv6 private information allocated and setup 5163 * before it can bring up and give link-local addresses 5164 * to other devices which are up. 5165 * 5166 * Unfortunately, loopback_dev is not necessarily the first 5167 * entry in the global dev_base list of net devices. In fact, 5168 * it is likely to be the very last entry on that list. 5169 * So this causes the notifier registry below to try and 5170 * give link-local addresses to all devices besides loopback_dev 5171 * first, then loopback_dev, which cases all the non-loopback_dev 5172 * devices to fail to get a link-local address. 5173 * 5174 * So, as a temporary fix, allocate the ipv6 structure for 5175 * loopback_dev first by hand. 5176 * Longer term, all of the dependencies ipv6 has upon the loopback 5177 * device and it being up should be removed. 5178 */ 5179 rtnl_lock(); 5180 if (!ipv6_add_dev(init_net.loopback_dev)) 5181 err = -ENOMEM; 5182 rtnl_unlock(); 5183 if (err) 5184 goto errlo; 5185 5186 for (i = 0; i < IN6_ADDR_HSIZE; i++) 5187 INIT_HLIST_HEAD(&inet6_addr_lst[i]); 5188 5189 register_netdevice_notifier(&ipv6_dev_notf); 5190 5191 addrconf_verify(0); 5192 5193 err = rtnl_af_register(&inet6_ops); 5194 if (err < 0) 5195 goto errout_af; 5196 5197 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo, 5198 NULL); 5199 if (err < 0) 5200 goto errout; 5201 5202 /* Only the first call to __rtnl_register can fail */ 5203 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL, NULL); 5204 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL, NULL); 5205 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr, 5206 inet6_dump_ifaddr, NULL); 5207 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL, 5208 inet6_dump_ifmcaddr, NULL); 5209 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL, 5210 inet6_dump_ifacaddr, NULL); 5211 __rtnl_register(PF_INET6, RTM_GETNETCONF, inet6_netconf_get_devconf, 5212 inet6_netconf_dump_devconf, NULL); 5213 5214 ipv6_addr_label_rtnl_register(); 5215 5216 return 0; 5217 errout: 5218 rtnl_af_unregister(&inet6_ops); 5219 errout_af: 5220 unregister_netdevice_notifier(&ipv6_dev_notf); 5221 errlo: 5222 unregister_pernet_subsys(&addrconf_ops); 5223 out_addrlabel: 5224 ipv6_addr_label_cleanup(); 5225 out: 5226 return err; 5227 } 5228 5229 void addrconf_cleanup(void) 5230 { 5231 struct net_device *dev; 5232 int i; 5233 5234 unregister_netdevice_notifier(&ipv6_dev_notf); 5235 unregister_pernet_subsys(&addrconf_ops); 5236 ipv6_addr_label_cleanup(); 5237 5238 rtnl_lock(); 5239 5240 __rtnl_af_unregister(&inet6_ops); 5241 5242 /* clean dev list */ 5243 for_each_netdev(&init_net, dev) { 5244 if (__in6_dev_get(dev) == NULL) 5245 continue; 5246 addrconf_ifdown(dev, 1); 5247 } 5248 addrconf_ifdown(init_net.loopback_dev, 2); 5249 5250 /* 5251 * Check hash table. 5252 */ 5253 spin_lock_bh(&addrconf_hash_lock); 5254 for (i = 0; i < IN6_ADDR_HSIZE; i++) 5255 WARN_ON(!hlist_empty(&inet6_addr_lst[i])); 5256 spin_unlock_bh(&addrconf_hash_lock); 5257 5258 del_timer(&addr_chk_timer); 5259 rtnl_unlock(); 5260 } 5261