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, 817 const struct in6_addr *peer_addr, int pfxlen, 818 int scope, u32 flags, u32 valid_lft, u32 prefered_lft) 819 { 820 struct inet6_ifaddr *ifa = NULL; 821 struct rt6_info *rt; 822 unsigned int hash; 823 int err = 0; 824 int addr_type = ipv6_addr_type(addr); 825 826 if (addr_type == IPV6_ADDR_ANY || 827 addr_type & IPV6_ADDR_MULTICAST || 828 (!(idev->dev->flags & IFF_LOOPBACK) && 829 addr_type & IPV6_ADDR_LOOPBACK)) 830 return ERR_PTR(-EADDRNOTAVAIL); 831 832 rcu_read_lock_bh(); 833 if (idev->dead) { 834 err = -ENODEV; /*XXX*/ 835 goto out2; 836 } 837 838 if (idev->cnf.disable_ipv6) { 839 err = -EACCES; 840 goto out2; 841 } 842 843 spin_lock(&addrconf_hash_lock); 844 845 /* Ignore adding duplicate addresses on an interface */ 846 if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) { 847 ADBG(("ipv6_add_addr: already assigned\n")); 848 err = -EEXIST; 849 goto out; 850 } 851 852 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC); 853 854 if (ifa == NULL) { 855 ADBG(("ipv6_add_addr: malloc failed\n")); 856 err = -ENOBUFS; 857 goto out; 858 } 859 860 rt = addrconf_dst_alloc(idev, addr, false); 861 if (IS_ERR(rt)) { 862 err = PTR_ERR(rt); 863 goto out; 864 } 865 866 ifa->addr = *addr; 867 if (peer_addr) 868 ifa->peer_addr = *peer_addr; 869 870 spin_lock_init(&ifa->lock); 871 spin_lock_init(&ifa->state_lock); 872 setup_timer(&ifa->dad_timer, addrconf_dad_timer, 873 (unsigned long)ifa); 874 INIT_HLIST_NODE(&ifa->addr_lst); 875 ifa->scope = scope; 876 ifa->prefix_len = pfxlen; 877 ifa->flags = flags | IFA_F_TENTATIVE; 878 ifa->valid_lft = valid_lft; 879 ifa->prefered_lft = prefered_lft; 880 ifa->cstamp = ifa->tstamp = jiffies; 881 ifa->tokenized = false; 882 883 ifa->rt = rt; 884 885 ifa->idev = idev; 886 in6_dev_hold(idev); 887 /* For caller */ 888 in6_ifa_hold(ifa); 889 890 /* Add to big hash table */ 891 hash = inet6_addr_hash(addr); 892 893 hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]); 894 spin_unlock(&addrconf_hash_lock); 895 896 write_lock(&idev->lock); 897 /* Add to inet6_dev unicast addr list. */ 898 ipv6_link_dev_addr(idev, ifa); 899 900 #ifdef CONFIG_IPV6_PRIVACY 901 if (ifa->flags&IFA_F_TEMPORARY) { 902 list_add(&ifa->tmp_list, &idev->tempaddr_list); 903 in6_ifa_hold(ifa); 904 } 905 #endif 906 907 in6_ifa_hold(ifa); 908 write_unlock(&idev->lock); 909 out2: 910 rcu_read_unlock_bh(); 911 912 if (likely(err == 0)) 913 inet6addr_notifier_call_chain(NETDEV_UP, ifa); 914 else { 915 kfree(ifa); 916 ifa = ERR_PTR(err); 917 } 918 919 return ifa; 920 out: 921 spin_unlock(&addrconf_hash_lock); 922 goto out2; 923 } 924 925 /* This function wants to get referenced ifp and releases it before return */ 926 927 static void ipv6_del_addr(struct inet6_ifaddr *ifp) 928 { 929 struct inet6_ifaddr *ifa, *ifn; 930 struct inet6_dev *idev = ifp->idev; 931 int state; 932 int deleted = 0, onlink = 0; 933 unsigned long expires = jiffies; 934 935 spin_lock_bh(&ifp->state_lock); 936 state = ifp->state; 937 ifp->state = INET6_IFADDR_STATE_DEAD; 938 spin_unlock_bh(&ifp->state_lock); 939 940 if (state == INET6_IFADDR_STATE_DEAD) 941 goto out; 942 943 spin_lock_bh(&addrconf_hash_lock); 944 hlist_del_init_rcu(&ifp->addr_lst); 945 spin_unlock_bh(&addrconf_hash_lock); 946 947 write_lock_bh(&idev->lock); 948 #ifdef CONFIG_IPV6_PRIVACY 949 if (ifp->flags&IFA_F_TEMPORARY) { 950 list_del(&ifp->tmp_list); 951 if (ifp->ifpub) { 952 in6_ifa_put(ifp->ifpub); 953 ifp->ifpub = NULL; 954 } 955 __in6_ifa_put(ifp); 956 } 957 #endif 958 959 list_for_each_entry_safe(ifa, ifn, &idev->addr_list, if_list) { 960 if (ifa == ifp) { 961 list_del_init(&ifp->if_list); 962 __in6_ifa_put(ifp); 963 964 if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0) 965 break; 966 deleted = 1; 967 continue; 968 } else if (ifp->flags & IFA_F_PERMANENT) { 969 if (ipv6_prefix_equal(&ifa->addr, &ifp->addr, 970 ifp->prefix_len)) { 971 if (ifa->flags & IFA_F_PERMANENT) { 972 onlink = 1; 973 if (deleted) 974 break; 975 } else { 976 unsigned long lifetime; 977 978 if (!onlink) 979 onlink = -1; 980 981 spin_lock(&ifa->lock); 982 983 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ); 984 /* 985 * Note: Because this address is 986 * not permanent, lifetime < 987 * LONG_MAX / HZ here. 988 */ 989 if (time_before(expires, 990 ifa->tstamp + lifetime * HZ)) 991 expires = ifa->tstamp + lifetime * HZ; 992 spin_unlock(&ifa->lock); 993 } 994 } 995 } 996 } 997 write_unlock_bh(&idev->lock); 998 999 addrconf_del_dad_timer(ifp); 1000 1001 ipv6_ifa_notify(RTM_DELADDR, ifp); 1002 1003 inet6addr_notifier_call_chain(NETDEV_DOWN, ifp); 1004 1005 /* 1006 * Purge or update corresponding prefix 1007 * 1008 * 1) we don't purge prefix here if address was not permanent. 1009 * prefix is managed by its own lifetime. 1010 * 2) if there're no addresses, delete prefix. 1011 * 3) if there're still other permanent address(es), 1012 * corresponding prefix is still permanent. 1013 * 4) otherwise, update prefix lifetime to the 1014 * longest valid lifetime among the corresponding 1015 * addresses on the device. 1016 * Note: subsequent RA will update lifetime. 1017 * 1018 * --yoshfuji 1019 */ 1020 if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) { 1021 struct in6_addr prefix; 1022 struct rt6_info *rt; 1023 1024 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len); 1025 1026 rt = addrconf_get_prefix_route(&prefix, 1027 ifp->prefix_len, 1028 ifp->idev->dev, 1029 0, RTF_GATEWAY | RTF_DEFAULT); 1030 1031 if (rt) { 1032 if (onlink == 0) { 1033 ip6_del_rt(rt); 1034 rt = NULL; 1035 } else if (!(rt->rt6i_flags & RTF_EXPIRES)) { 1036 rt6_set_expires(rt, expires); 1037 } 1038 } 1039 ip6_rt_put(rt); 1040 } 1041 1042 /* clean up prefsrc entries */ 1043 rt6_remove_prefsrc(ifp); 1044 out: 1045 in6_ifa_put(ifp); 1046 } 1047 1048 #ifdef CONFIG_IPV6_PRIVACY 1049 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift) 1050 { 1051 struct inet6_dev *idev = ifp->idev; 1052 struct in6_addr addr, *tmpaddr; 1053 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_tstamp, age; 1054 unsigned long regen_advance; 1055 int tmp_plen; 1056 int ret = 0; 1057 int max_addresses; 1058 u32 addr_flags; 1059 unsigned long now = jiffies; 1060 1061 write_lock(&idev->lock); 1062 if (ift) { 1063 spin_lock_bh(&ift->lock); 1064 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8); 1065 spin_unlock_bh(&ift->lock); 1066 tmpaddr = &addr; 1067 } else { 1068 tmpaddr = NULL; 1069 } 1070 retry: 1071 in6_dev_hold(idev); 1072 if (idev->cnf.use_tempaddr <= 0) { 1073 write_unlock(&idev->lock); 1074 pr_info("%s: use_tempaddr is disabled\n", __func__); 1075 in6_dev_put(idev); 1076 ret = -1; 1077 goto out; 1078 } 1079 spin_lock_bh(&ifp->lock); 1080 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) { 1081 idev->cnf.use_tempaddr = -1; /*XXX*/ 1082 spin_unlock_bh(&ifp->lock); 1083 write_unlock(&idev->lock); 1084 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n", 1085 __func__); 1086 in6_dev_put(idev); 1087 ret = -1; 1088 goto out; 1089 } 1090 in6_ifa_hold(ifp); 1091 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8); 1092 __ipv6_try_regen_rndid(idev, tmpaddr); 1093 memcpy(&addr.s6_addr[8], idev->rndid, 8); 1094 age = (now - ifp->tstamp) / HZ; 1095 tmp_valid_lft = min_t(__u32, 1096 ifp->valid_lft, 1097 idev->cnf.temp_valid_lft + age); 1098 tmp_prefered_lft = min_t(__u32, 1099 ifp->prefered_lft, 1100 idev->cnf.temp_prefered_lft + age - 1101 idev->cnf.max_desync_factor); 1102 tmp_plen = ifp->prefix_len; 1103 max_addresses = idev->cnf.max_addresses; 1104 tmp_tstamp = ifp->tstamp; 1105 spin_unlock_bh(&ifp->lock); 1106 1107 regen_advance = idev->cnf.regen_max_retry * 1108 idev->cnf.dad_transmits * 1109 idev->nd_parms->retrans_time / HZ; 1110 write_unlock(&idev->lock); 1111 1112 /* A temporary address is created only if this calculated Preferred 1113 * Lifetime is greater than REGEN_ADVANCE time units. In particular, 1114 * an implementation must not create a temporary address with a zero 1115 * Preferred Lifetime. 1116 */ 1117 if (tmp_prefered_lft <= regen_advance) { 1118 in6_ifa_put(ifp); 1119 in6_dev_put(idev); 1120 ret = -1; 1121 goto out; 1122 } 1123 1124 addr_flags = IFA_F_TEMPORARY; 1125 /* set in addrconf_prefix_rcv() */ 1126 if (ifp->flags & IFA_F_OPTIMISTIC) 1127 addr_flags |= IFA_F_OPTIMISTIC; 1128 1129 ift = ipv6_add_addr(idev, &addr, NULL, tmp_plen, 1130 ipv6_addr_scope(&addr), addr_flags, 1131 tmp_valid_lft, tmp_prefered_lft); 1132 if (IS_ERR(ift)) { 1133 in6_ifa_put(ifp); 1134 in6_dev_put(idev); 1135 pr_info("%s: retry temporary address regeneration\n", __func__); 1136 tmpaddr = &addr; 1137 write_lock(&idev->lock); 1138 goto retry; 1139 } 1140 1141 spin_lock_bh(&ift->lock); 1142 ift->ifpub = ifp; 1143 ift->cstamp = now; 1144 ift->tstamp = tmp_tstamp; 1145 spin_unlock_bh(&ift->lock); 1146 1147 addrconf_dad_start(ift); 1148 in6_ifa_put(ift); 1149 in6_dev_put(idev); 1150 out: 1151 return ret; 1152 } 1153 #endif 1154 1155 /* 1156 * Choose an appropriate source address (RFC3484) 1157 */ 1158 enum { 1159 IPV6_SADDR_RULE_INIT = 0, 1160 IPV6_SADDR_RULE_LOCAL, 1161 IPV6_SADDR_RULE_SCOPE, 1162 IPV6_SADDR_RULE_PREFERRED, 1163 #ifdef CONFIG_IPV6_MIP6 1164 IPV6_SADDR_RULE_HOA, 1165 #endif 1166 IPV6_SADDR_RULE_OIF, 1167 IPV6_SADDR_RULE_LABEL, 1168 #ifdef CONFIG_IPV6_PRIVACY 1169 IPV6_SADDR_RULE_PRIVACY, 1170 #endif 1171 IPV6_SADDR_RULE_ORCHID, 1172 IPV6_SADDR_RULE_PREFIX, 1173 IPV6_SADDR_RULE_MAX 1174 }; 1175 1176 struct ipv6_saddr_score { 1177 int rule; 1178 int addr_type; 1179 struct inet6_ifaddr *ifa; 1180 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX); 1181 int scopedist; 1182 int matchlen; 1183 }; 1184 1185 struct ipv6_saddr_dst { 1186 const struct in6_addr *addr; 1187 int ifindex; 1188 int scope; 1189 int label; 1190 unsigned int prefs; 1191 }; 1192 1193 static inline int ipv6_saddr_preferred(int type) 1194 { 1195 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK)) 1196 return 1; 1197 return 0; 1198 } 1199 1200 static int ipv6_get_saddr_eval(struct net *net, 1201 struct ipv6_saddr_score *score, 1202 struct ipv6_saddr_dst *dst, 1203 int i) 1204 { 1205 int ret; 1206 1207 if (i <= score->rule) { 1208 switch (i) { 1209 case IPV6_SADDR_RULE_SCOPE: 1210 ret = score->scopedist; 1211 break; 1212 case IPV6_SADDR_RULE_PREFIX: 1213 ret = score->matchlen; 1214 break; 1215 default: 1216 ret = !!test_bit(i, score->scorebits); 1217 } 1218 goto out; 1219 } 1220 1221 switch (i) { 1222 case IPV6_SADDR_RULE_INIT: 1223 /* Rule 0: remember if hiscore is not ready yet */ 1224 ret = !!score->ifa; 1225 break; 1226 case IPV6_SADDR_RULE_LOCAL: 1227 /* Rule 1: Prefer same address */ 1228 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr); 1229 break; 1230 case IPV6_SADDR_RULE_SCOPE: 1231 /* Rule 2: Prefer appropriate scope 1232 * 1233 * ret 1234 * ^ 1235 * -1 | d 15 1236 * ---+--+-+---> scope 1237 * | 1238 * | d is scope of the destination. 1239 * B-d | \ 1240 * | \ <- smaller scope is better if 1241 * B-15 | \ if scope is enough for destinaion. 1242 * | ret = B - scope (-1 <= scope >= d <= 15). 1243 * d-C-1 | / 1244 * |/ <- greater is better 1245 * -C / if scope is not enough for destination. 1246 * /| ret = scope - C (-1 <= d < scope <= 15). 1247 * 1248 * d - C - 1 < B -15 (for all -1 <= d <= 15). 1249 * C > d + 14 - B >= 15 + 14 - B = 29 - B. 1250 * Assume B = 0 and we get C > 29. 1251 */ 1252 ret = __ipv6_addr_src_scope(score->addr_type); 1253 if (ret >= dst->scope) 1254 ret = -ret; 1255 else 1256 ret -= 128; /* 30 is enough */ 1257 score->scopedist = ret; 1258 break; 1259 case IPV6_SADDR_RULE_PREFERRED: 1260 /* Rule 3: Avoid deprecated and optimistic addresses */ 1261 ret = ipv6_saddr_preferred(score->addr_type) || 1262 !(score->ifa->flags & (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC)); 1263 break; 1264 #ifdef CONFIG_IPV6_MIP6 1265 case IPV6_SADDR_RULE_HOA: 1266 { 1267 /* Rule 4: Prefer home address */ 1268 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA); 1269 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome; 1270 break; 1271 } 1272 #endif 1273 case IPV6_SADDR_RULE_OIF: 1274 /* Rule 5: Prefer outgoing interface */ 1275 ret = (!dst->ifindex || 1276 dst->ifindex == score->ifa->idev->dev->ifindex); 1277 break; 1278 case IPV6_SADDR_RULE_LABEL: 1279 /* Rule 6: Prefer matching label */ 1280 ret = ipv6_addr_label(net, 1281 &score->ifa->addr, score->addr_type, 1282 score->ifa->idev->dev->ifindex) == dst->label; 1283 break; 1284 #ifdef CONFIG_IPV6_PRIVACY 1285 case IPV6_SADDR_RULE_PRIVACY: 1286 { 1287 /* Rule 7: Prefer public address 1288 * Note: prefer temporary address if use_tempaddr >= 2 1289 */ 1290 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ? 1291 !!(dst->prefs & IPV6_PREFER_SRC_TMP) : 1292 score->ifa->idev->cnf.use_tempaddr >= 2; 1293 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp; 1294 break; 1295 } 1296 #endif 1297 case IPV6_SADDR_RULE_ORCHID: 1298 /* Rule 8-: Prefer ORCHID vs ORCHID or 1299 * non-ORCHID vs non-ORCHID 1300 */ 1301 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^ 1302 ipv6_addr_orchid(dst->addr)); 1303 break; 1304 case IPV6_SADDR_RULE_PREFIX: 1305 /* Rule 8: Use longest matching prefix */ 1306 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr); 1307 if (ret > score->ifa->prefix_len) 1308 ret = score->ifa->prefix_len; 1309 score->matchlen = ret; 1310 break; 1311 default: 1312 ret = 0; 1313 } 1314 1315 if (ret) 1316 __set_bit(i, score->scorebits); 1317 score->rule = i; 1318 out: 1319 return ret; 1320 } 1321 1322 int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev, 1323 const struct in6_addr *daddr, unsigned int prefs, 1324 struct in6_addr *saddr) 1325 { 1326 struct ipv6_saddr_score scores[2], 1327 *score = &scores[0], *hiscore = &scores[1]; 1328 struct ipv6_saddr_dst dst; 1329 struct net_device *dev; 1330 int dst_type; 1331 1332 dst_type = __ipv6_addr_type(daddr); 1333 dst.addr = daddr; 1334 dst.ifindex = dst_dev ? dst_dev->ifindex : 0; 1335 dst.scope = __ipv6_addr_src_scope(dst_type); 1336 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex); 1337 dst.prefs = prefs; 1338 1339 hiscore->rule = -1; 1340 hiscore->ifa = NULL; 1341 1342 rcu_read_lock(); 1343 1344 for_each_netdev_rcu(net, dev) { 1345 struct inet6_dev *idev; 1346 1347 /* Candidate Source Address (section 4) 1348 * - multicast and link-local destination address, 1349 * the set of candidate source address MUST only 1350 * include addresses assigned to interfaces 1351 * belonging to the same link as the outgoing 1352 * interface. 1353 * (- For site-local destination addresses, the 1354 * set of candidate source addresses MUST only 1355 * include addresses assigned to interfaces 1356 * belonging to the same site as the outgoing 1357 * interface.) 1358 */ 1359 if (((dst_type & IPV6_ADDR_MULTICAST) || 1360 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL) && 1361 dst.ifindex && dev->ifindex != dst.ifindex) 1362 continue; 1363 1364 idev = __in6_dev_get(dev); 1365 if (!idev) 1366 continue; 1367 1368 read_lock_bh(&idev->lock); 1369 list_for_each_entry(score->ifa, &idev->addr_list, if_list) { 1370 int i; 1371 1372 /* 1373 * - Tentative Address (RFC2462 section 5.4) 1374 * - A tentative address is not considered 1375 * "assigned to an interface" in the traditional 1376 * sense, unless it is also flagged as optimistic. 1377 * - Candidate Source Address (section 4) 1378 * - In any case, anycast addresses, multicast 1379 * addresses, and the unspecified address MUST 1380 * NOT be included in a candidate set. 1381 */ 1382 if ((score->ifa->flags & IFA_F_TENTATIVE) && 1383 (!(score->ifa->flags & IFA_F_OPTIMISTIC))) 1384 continue; 1385 1386 score->addr_type = __ipv6_addr_type(&score->ifa->addr); 1387 1388 if (unlikely(score->addr_type == IPV6_ADDR_ANY || 1389 score->addr_type & IPV6_ADDR_MULTICAST)) { 1390 LIMIT_NETDEBUG(KERN_DEBUG 1391 "ADDRCONF: unspecified / multicast address " 1392 "assigned as unicast address on %s", 1393 dev->name); 1394 continue; 1395 } 1396 1397 score->rule = -1; 1398 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX); 1399 1400 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) { 1401 int minihiscore, miniscore; 1402 1403 minihiscore = ipv6_get_saddr_eval(net, hiscore, &dst, i); 1404 miniscore = ipv6_get_saddr_eval(net, score, &dst, i); 1405 1406 if (minihiscore > miniscore) { 1407 if (i == IPV6_SADDR_RULE_SCOPE && 1408 score->scopedist > 0) { 1409 /* 1410 * special case: 1411 * each remaining entry 1412 * has too small (not enough) 1413 * scope, because ifa entries 1414 * are sorted by their scope 1415 * values. 1416 */ 1417 goto try_nextdev; 1418 } 1419 break; 1420 } else if (minihiscore < miniscore) { 1421 if (hiscore->ifa) 1422 in6_ifa_put(hiscore->ifa); 1423 1424 in6_ifa_hold(score->ifa); 1425 1426 swap(hiscore, score); 1427 1428 /* restore our iterator */ 1429 score->ifa = hiscore->ifa; 1430 1431 break; 1432 } 1433 } 1434 } 1435 try_nextdev: 1436 read_unlock_bh(&idev->lock); 1437 } 1438 rcu_read_unlock(); 1439 1440 if (!hiscore->ifa) 1441 return -EADDRNOTAVAIL; 1442 1443 *saddr = hiscore->ifa->addr; 1444 in6_ifa_put(hiscore->ifa); 1445 return 0; 1446 } 1447 EXPORT_SYMBOL(ipv6_dev_get_saddr); 1448 1449 int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr, 1450 unsigned char banned_flags) 1451 { 1452 struct inet6_ifaddr *ifp; 1453 int err = -EADDRNOTAVAIL; 1454 1455 list_for_each_entry(ifp, &idev->addr_list, if_list) { 1456 if (ifp->scope == IFA_LINK && 1457 !(ifp->flags & banned_flags)) { 1458 *addr = ifp->addr; 1459 err = 0; 1460 break; 1461 } 1462 } 1463 return err; 1464 } 1465 1466 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr, 1467 unsigned char banned_flags) 1468 { 1469 struct inet6_dev *idev; 1470 int err = -EADDRNOTAVAIL; 1471 1472 rcu_read_lock(); 1473 idev = __in6_dev_get(dev); 1474 if (idev) { 1475 read_lock_bh(&idev->lock); 1476 err = __ipv6_get_lladdr(idev, addr, banned_flags); 1477 read_unlock_bh(&idev->lock); 1478 } 1479 rcu_read_unlock(); 1480 return err; 1481 } 1482 1483 static int ipv6_count_addresses(struct inet6_dev *idev) 1484 { 1485 int cnt = 0; 1486 struct inet6_ifaddr *ifp; 1487 1488 read_lock_bh(&idev->lock); 1489 list_for_each_entry(ifp, &idev->addr_list, if_list) 1490 cnt++; 1491 read_unlock_bh(&idev->lock); 1492 return cnt; 1493 } 1494 1495 int ipv6_chk_addr(struct net *net, const struct in6_addr *addr, 1496 const struct net_device *dev, int strict) 1497 { 1498 struct inet6_ifaddr *ifp; 1499 unsigned int hash = inet6_addr_hash(addr); 1500 1501 rcu_read_lock_bh(); 1502 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) { 1503 if (!net_eq(dev_net(ifp->idev->dev), net)) 1504 continue; 1505 if (ipv6_addr_equal(&ifp->addr, addr) && 1506 !(ifp->flags&IFA_F_TENTATIVE) && 1507 (dev == NULL || ifp->idev->dev == dev || 1508 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) { 1509 rcu_read_unlock_bh(); 1510 return 1; 1511 } 1512 } 1513 1514 rcu_read_unlock_bh(); 1515 return 0; 1516 } 1517 EXPORT_SYMBOL(ipv6_chk_addr); 1518 1519 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr, 1520 struct net_device *dev) 1521 { 1522 unsigned int hash = inet6_addr_hash(addr); 1523 struct inet6_ifaddr *ifp; 1524 1525 hlist_for_each_entry(ifp, &inet6_addr_lst[hash], addr_lst) { 1526 if (!net_eq(dev_net(ifp->idev->dev), net)) 1527 continue; 1528 if (ipv6_addr_equal(&ifp->addr, addr)) { 1529 if (dev == NULL || ifp->idev->dev == dev) 1530 return true; 1531 } 1532 } 1533 return false; 1534 } 1535 1536 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev) 1537 { 1538 struct inet6_dev *idev; 1539 struct inet6_ifaddr *ifa; 1540 int onlink; 1541 1542 onlink = 0; 1543 rcu_read_lock(); 1544 idev = __in6_dev_get(dev); 1545 if (idev) { 1546 read_lock_bh(&idev->lock); 1547 list_for_each_entry(ifa, &idev->addr_list, if_list) { 1548 onlink = ipv6_prefix_equal(addr, &ifa->addr, 1549 ifa->prefix_len); 1550 if (onlink) 1551 break; 1552 } 1553 read_unlock_bh(&idev->lock); 1554 } 1555 rcu_read_unlock(); 1556 return onlink; 1557 } 1558 EXPORT_SYMBOL(ipv6_chk_prefix); 1559 1560 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr, 1561 struct net_device *dev, int strict) 1562 { 1563 struct inet6_ifaddr *ifp, *result = NULL; 1564 unsigned int hash = inet6_addr_hash(addr); 1565 1566 rcu_read_lock_bh(); 1567 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) { 1568 if (!net_eq(dev_net(ifp->idev->dev), net)) 1569 continue; 1570 if (ipv6_addr_equal(&ifp->addr, addr)) { 1571 if (dev == NULL || ifp->idev->dev == dev || 1572 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) { 1573 result = ifp; 1574 in6_ifa_hold(ifp); 1575 break; 1576 } 1577 } 1578 } 1579 rcu_read_unlock_bh(); 1580 1581 return result; 1582 } 1583 1584 /* Gets referenced address, destroys ifaddr */ 1585 1586 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed) 1587 { 1588 if (ifp->flags&IFA_F_PERMANENT) { 1589 spin_lock_bh(&ifp->lock); 1590 addrconf_del_dad_timer(ifp); 1591 ifp->flags |= IFA_F_TENTATIVE; 1592 if (dad_failed) 1593 ifp->flags |= IFA_F_DADFAILED; 1594 spin_unlock_bh(&ifp->lock); 1595 if (dad_failed) 1596 ipv6_ifa_notify(0, ifp); 1597 in6_ifa_put(ifp); 1598 #ifdef CONFIG_IPV6_PRIVACY 1599 } else if (ifp->flags&IFA_F_TEMPORARY) { 1600 struct inet6_ifaddr *ifpub; 1601 spin_lock_bh(&ifp->lock); 1602 ifpub = ifp->ifpub; 1603 if (ifpub) { 1604 in6_ifa_hold(ifpub); 1605 spin_unlock_bh(&ifp->lock); 1606 ipv6_create_tempaddr(ifpub, ifp); 1607 in6_ifa_put(ifpub); 1608 } else { 1609 spin_unlock_bh(&ifp->lock); 1610 } 1611 ipv6_del_addr(ifp); 1612 #endif 1613 } else 1614 ipv6_del_addr(ifp); 1615 } 1616 1617 static int addrconf_dad_end(struct inet6_ifaddr *ifp) 1618 { 1619 int err = -ENOENT; 1620 1621 spin_lock(&ifp->state_lock); 1622 if (ifp->state == INET6_IFADDR_STATE_DAD) { 1623 ifp->state = INET6_IFADDR_STATE_POSTDAD; 1624 err = 0; 1625 } 1626 spin_unlock(&ifp->state_lock); 1627 1628 return err; 1629 } 1630 1631 void addrconf_dad_failure(struct inet6_ifaddr *ifp) 1632 { 1633 struct inet6_dev *idev = ifp->idev; 1634 1635 if (addrconf_dad_end(ifp)) { 1636 in6_ifa_put(ifp); 1637 return; 1638 } 1639 1640 net_info_ratelimited("%s: IPv6 duplicate address %pI6c detected!\n", 1641 ifp->idev->dev->name, &ifp->addr); 1642 1643 if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6) { 1644 struct in6_addr addr; 1645 1646 addr.s6_addr32[0] = htonl(0xfe800000); 1647 addr.s6_addr32[1] = 0; 1648 1649 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) && 1650 ipv6_addr_equal(&ifp->addr, &addr)) { 1651 /* DAD failed for link-local based on MAC address */ 1652 idev->cnf.disable_ipv6 = 1; 1653 1654 pr_info("%s: IPv6 being disabled!\n", 1655 ifp->idev->dev->name); 1656 } 1657 } 1658 1659 addrconf_dad_stop(ifp, 1); 1660 } 1661 1662 /* Join to solicited addr multicast group. */ 1663 1664 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr) 1665 { 1666 struct in6_addr maddr; 1667 1668 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP)) 1669 return; 1670 1671 addrconf_addr_solict_mult(addr, &maddr); 1672 ipv6_dev_mc_inc(dev, &maddr); 1673 } 1674 1675 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr) 1676 { 1677 struct in6_addr maddr; 1678 1679 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP)) 1680 return; 1681 1682 addrconf_addr_solict_mult(addr, &maddr); 1683 __ipv6_dev_mc_dec(idev, &maddr); 1684 } 1685 1686 static void addrconf_join_anycast(struct inet6_ifaddr *ifp) 1687 { 1688 struct in6_addr addr; 1689 if (ifp->prefix_len == 127) /* RFC 6164 */ 1690 return; 1691 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len); 1692 if (ipv6_addr_any(&addr)) 1693 return; 1694 ipv6_dev_ac_inc(ifp->idev->dev, &addr); 1695 } 1696 1697 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp) 1698 { 1699 struct in6_addr addr; 1700 if (ifp->prefix_len == 127) /* RFC 6164 */ 1701 return; 1702 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len); 1703 if (ipv6_addr_any(&addr)) 1704 return; 1705 __ipv6_dev_ac_dec(ifp->idev, &addr); 1706 } 1707 1708 static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev) 1709 { 1710 if (dev->addr_len != ETH_ALEN) 1711 return -1; 1712 memcpy(eui, dev->dev_addr, 3); 1713 memcpy(eui + 5, dev->dev_addr + 3, 3); 1714 1715 /* 1716 * The zSeries OSA network cards can be shared among various 1717 * OS instances, but the OSA cards have only one MAC address. 1718 * This leads to duplicate address conflicts in conjunction 1719 * with IPv6 if more than one instance uses the same card. 1720 * 1721 * The driver for these cards can deliver a unique 16-bit 1722 * identifier for each instance sharing the same card. It is 1723 * placed instead of 0xFFFE in the interface identifier. The 1724 * "u" bit of the interface identifier is not inverted in this 1725 * case. Hence the resulting interface identifier has local 1726 * scope according to RFC2373. 1727 */ 1728 if (dev->dev_id) { 1729 eui[3] = (dev->dev_id >> 8) & 0xFF; 1730 eui[4] = dev->dev_id & 0xFF; 1731 } else { 1732 eui[3] = 0xFF; 1733 eui[4] = 0xFE; 1734 eui[0] ^= 2; 1735 } 1736 return 0; 1737 } 1738 1739 static int addrconf_ifid_eui64(u8 *eui, struct net_device *dev) 1740 { 1741 if (dev->addr_len != IEEE802154_ADDR_LEN) 1742 return -1; 1743 memcpy(eui, dev->dev_addr, 8); 1744 eui[0] ^= 2; 1745 return 0; 1746 } 1747 1748 static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev) 1749 { 1750 union fwnet_hwaddr *ha; 1751 1752 if (dev->addr_len != FWNET_ALEN) 1753 return -1; 1754 1755 ha = (union fwnet_hwaddr *)dev->dev_addr; 1756 1757 memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id)); 1758 eui[0] ^= 2; 1759 return 0; 1760 } 1761 1762 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev) 1763 { 1764 /* XXX: inherit EUI-64 from other interface -- yoshfuji */ 1765 if (dev->addr_len != ARCNET_ALEN) 1766 return -1; 1767 memset(eui, 0, 7); 1768 eui[7] = *(u8 *)dev->dev_addr; 1769 return 0; 1770 } 1771 1772 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev) 1773 { 1774 if (dev->addr_len != INFINIBAND_ALEN) 1775 return -1; 1776 memcpy(eui, dev->dev_addr + 12, 8); 1777 eui[0] |= 2; 1778 return 0; 1779 } 1780 1781 static int __ipv6_isatap_ifid(u8 *eui, __be32 addr) 1782 { 1783 if (addr == 0) 1784 return -1; 1785 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) || 1786 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) || 1787 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) || 1788 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) || 1789 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) || 1790 ipv4_is_lbcast(addr)) ? 0x00 : 0x02; 1791 eui[1] = 0; 1792 eui[2] = 0x5E; 1793 eui[3] = 0xFE; 1794 memcpy(eui + 4, &addr, 4); 1795 return 0; 1796 } 1797 1798 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev) 1799 { 1800 if (dev->priv_flags & IFF_ISATAP) 1801 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr); 1802 return -1; 1803 } 1804 1805 static int addrconf_ifid_gre(u8 *eui, struct net_device *dev) 1806 { 1807 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr); 1808 } 1809 1810 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev) 1811 { 1812 switch (dev->type) { 1813 case ARPHRD_ETHER: 1814 case ARPHRD_FDDI: 1815 return addrconf_ifid_eui48(eui, dev); 1816 case ARPHRD_ARCNET: 1817 return addrconf_ifid_arcnet(eui, dev); 1818 case ARPHRD_INFINIBAND: 1819 return addrconf_ifid_infiniband(eui, dev); 1820 case ARPHRD_SIT: 1821 return addrconf_ifid_sit(eui, dev); 1822 case ARPHRD_IPGRE: 1823 return addrconf_ifid_gre(eui, dev); 1824 case ARPHRD_IEEE802154: 1825 return addrconf_ifid_eui64(eui, dev); 1826 case ARPHRD_IEEE1394: 1827 return addrconf_ifid_ieee1394(eui, dev); 1828 } 1829 return -1; 1830 } 1831 1832 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev) 1833 { 1834 int err = -1; 1835 struct inet6_ifaddr *ifp; 1836 1837 read_lock_bh(&idev->lock); 1838 list_for_each_entry(ifp, &idev->addr_list, if_list) { 1839 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) { 1840 memcpy(eui, ifp->addr.s6_addr+8, 8); 1841 err = 0; 1842 break; 1843 } 1844 } 1845 read_unlock_bh(&idev->lock); 1846 return err; 1847 } 1848 1849 #ifdef CONFIG_IPV6_PRIVACY 1850 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */ 1851 static void __ipv6_regen_rndid(struct inet6_dev *idev) 1852 { 1853 regen: 1854 get_random_bytes(idev->rndid, sizeof(idev->rndid)); 1855 idev->rndid[0] &= ~0x02; 1856 1857 /* 1858 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>: 1859 * check if generated address is not inappropriate 1860 * 1861 * - Reserved subnet anycast (RFC 2526) 1862 * 11111101 11....11 1xxxxxxx 1863 * - ISATAP (RFC4214) 6.1 1864 * 00-00-5E-FE-xx-xx-xx-xx 1865 * - value 0 1866 * - XXX: already assigned to an address on the device 1867 */ 1868 if (idev->rndid[0] == 0xfd && 1869 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff && 1870 (idev->rndid[7]&0x80)) 1871 goto regen; 1872 if ((idev->rndid[0]|idev->rndid[1]) == 0) { 1873 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe) 1874 goto regen; 1875 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00) 1876 goto regen; 1877 } 1878 } 1879 1880 static void ipv6_regen_rndid(unsigned long data) 1881 { 1882 struct inet6_dev *idev = (struct inet6_dev *) data; 1883 unsigned long expires; 1884 1885 rcu_read_lock_bh(); 1886 write_lock_bh(&idev->lock); 1887 1888 if (idev->dead) 1889 goto out; 1890 1891 __ipv6_regen_rndid(idev); 1892 1893 expires = jiffies + 1894 idev->cnf.temp_prefered_lft * HZ - 1895 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time - 1896 idev->cnf.max_desync_factor * HZ; 1897 if (time_before(expires, jiffies)) { 1898 pr_warn("%s: too short regeneration interval; timer disabled for %s\n", 1899 __func__, idev->dev->name); 1900 goto out; 1901 } 1902 1903 if (!mod_timer(&idev->regen_timer, expires)) 1904 in6_dev_hold(idev); 1905 1906 out: 1907 write_unlock_bh(&idev->lock); 1908 rcu_read_unlock_bh(); 1909 in6_dev_put(idev); 1910 } 1911 1912 static void __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) 1913 { 1914 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0) 1915 __ipv6_regen_rndid(idev); 1916 } 1917 #endif 1918 1919 /* 1920 * Add prefix route. 1921 */ 1922 1923 static void 1924 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev, 1925 unsigned long expires, u32 flags) 1926 { 1927 struct fib6_config cfg = { 1928 .fc_table = RT6_TABLE_PREFIX, 1929 .fc_metric = IP6_RT_PRIO_ADDRCONF, 1930 .fc_ifindex = dev->ifindex, 1931 .fc_expires = expires, 1932 .fc_dst_len = plen, 1933 .fc_flags = RTF_UP | flags, 1934 .fc_nlinfo.nl_net = dev_net(dev), 1935 .fc_protocol = RTPROT_KERNEL, 1936 }; 1937 1938 cfg.fc_dst = *pfx; 1939 1940 /* Prevent useless cloning on PtP SIT. 1941 This thing is done here expecting that the whole 1942 class of non-broadcast devices need not cloning. 1943 */ 1944 #if IS_ENABLED(CONFIG_IPV6_SIT) 1945 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT)) 1946 cfg.fc_flags |= RTF_NONEXTHOP; 1947 #endif 1948 1949 ip6_route_add(&cfg); 1950 } 1951 1952 1953 static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx, 1954 int plen, 1955 const struct net_device *dev, 1956 u32 flags, u32 noflags) 1957 { 1958 struct fib6_node *fn; 1959 struct rt6_info *rt = NULL; 1960 struct fib6_table *table; 1961 1962 table = fib6_get_table(dev_net(dev), RT6_TABLE_PREFIX); 1963 if (table == NULL) 1964 return NULL; 1965 1966 read_lock_bh(&table->tb6_lock); 1967 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0); 1968 if (!fn) 1969 goto out; 1970 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) { 1971 if (rt->dst.dev->ifindex != dev->ifindex) 1972 continue; 1973 if ((rt->rt6i_flags & flags) != flags) 1974 continue; 1975 if ((rt->rt6i_flags & noflags) != 0) 1976 continue; 1977 dst_hold(&rt->dst); 1978 break; 1979 } 1980 out: 1981 read_unlock_bh(&table->tb6_lock); 1982 return rt; 1983 } 1984 1985 1986 /* Create "default" multicast route to the interface */ 1987 1988 static void addrconf_add_mroute(struct net_device *dev) 1989 { 1990 struct fib6_config cfg = { 1991 .fc_table = RT6_TABLE_LOCAL, 1992 .fc_metric = IP6_RT_PRIO_ADDRCONF, 1993 .fc_ifindex = dev->ifindex, 1994 .fc_dst_len = 8, 1995 .fc_flags = RTF_UP, 1996 .fc_nlinfo.nl_net = dev_net(dev), 1997 }; 1998 1999 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0); 2000 2001 ip6_route_add(&cfg); 2002 } 2003 2004 #if IS_ENABLED(CONFIG_IPV6_SIT) 2005 static void sit_route_add(struct net_device *dev) 2006 { 2007 struct fib6_config cfg = { 2008 .fc_table = RT6_TABLE_MAIN, 2009 .fc_metric = IP6_RT_PRIO_ADDRCONF, 2010 .fc_ifindex = dev->ifindex, 2011 .fc_dst_len = 96, 2012 .fc_flags = RTF_UP | RTF_NONEXTHOP, 2013 .fc_nlinfo.nl_net = dev_net(dev), 2014 }; 2015 2016 /* prefix length - 96 bits "::d.d.d.d" */ 2017 ip6_route_add(&cfg); 2018 } 2019 #endif 2020 2021 static struct inet6_dev *addrconf_add_dev(struct net_device *dev) 2022 { 2023 struct inet6_dev *idev; 2024 2025 ASSERT_RTNL(); 2026 2027 idev = ipv6_find_idev(dev); 2028 if (!idev) 2029 return ERR_PTR(-ENOBUFS); 2030 2031 if (idev->cnf.disable_ipv6) 2032 return ERR_PTR(-EACCES); 2033 2034 /* Add default multicast route */ 2035 if (!(dev->flags & IFF_LOOPBACK)) 2036 addrconf_add_mroute(dev); 2037 2038 return idev; 2039 } 2040 2041 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao) 2042 { 2043 struct prefix_info *pinfo; 2044 __u32 valid_lft; 2045 __u32 prefered_lft; 2046 int addr_type; 2047 struct inet6_dev *in6_dev; 2048 struct net *net = dev_net(dev); 2049 2050 pinfo = (struct prefix_info *) opt; 2051 2052 if (len < sizeof(struct prefix_info)) { 2053 ADBG(("addrconf: prefix option too short\n")); 2054 return; 2055 } 2056 2057 /* 2058 * Validation checks ([ADDRCONF], page 19) 2059 */ 2060 2061 addr_type = ipv6_addr_type(&pinfo->prefix); 2062 2063 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL)) 2064 return; 2065 2066 valid_lft = ntohl(pinfo->valid); 2067 prefered_lft = ntohl(pinfo->prefered); 2068 2069 if (prefered_lft > valid_lft) { 2070 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n"); 2071 return; 2072 } 2073 2074 in6_dev = in6_dev_get(dev); 2075 2076 if (in6_dev == NULL) { 2077 net_dbg_ratelimited("addrconf: device %s not configured\n", 2078 dev->name); 2079 return; 2080 } 2081 2082 /* 2083 * Two things going on here: 2084 * 1) Add routes for on-link prefixes 2085 * 2) Configure prefixes with the auto flag set 2086 */ 2087 2088 if (pinfo->onlink) { 2089 struct rt6_info *rt; 2090 unsigned long rt_expires; 2091 2092 /* Avoid arithmetic overflow. Really, we could 2093 * save rt_expires in seconds, likely valid_lft, 2094 * but it would require division in fib gc, that it 2095 * not good. 2096 */ 2097 if (HZ > USER_HZ) 2098 rt_expires = addrconf_timeout_fixup(valid_lft, HZ); 2099 else 2100 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ); 2101 2102 if (addrconf_finite_timeout(rt_expires)) 2103 rt_expires *= HZ; 2104 2105 rt = addrconf_get_prefix_route(&pinfo->prefix, 2106 pinfo->prefix_len, 2107 dev, 2108 RTF_ADDRCONF | RTF_PREFIX_RT, 2109 RTF_GATEWAY | RTF_DEFAULT); 2110 2111 if (rt) { 2112 /* Autoconf prefix route */ 2113 if (valid_lft == 0) { 2114 ip6_del_rt(rt); 2115 rt = NULL; 2116 } else if (addrconf_finite_timeout(rt_expires)) { 2117 /* not infinity */ 2118 rt6_set_expires(rt, jiffies + rt_expires); 2119 } else { 2120 rt6_clean_expires(rt); 2121 } 2122 } else if (valid_lft) { 2123 clock_t expires = 0; 2124 int flags = RTF_ADDRCONF | RTF_PREFIX_RT; 2125 if (addrconf_finite_timeout(rt_expires)) { 2126 /* not infinity */ 2127 flags |= RTF_EXPIRES; 2128 expires = jiffies_to_clock_t(rt_expires); 2129 } 2130 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len, 2131 dev, expires, flags); 2132 } 2133 ip6_rt_put(rt); 2134 } 2135 2136 /* Try to figure out our local address for this prefix */ 2137 2138 if (pinfo->autoconf && in6_dev->cnf.autoconf) { 2139 struct inet6_ifaddr *ifp; 2140 struct in6_addr addr; 2141 int create = 0, update_lft = 0; 2142 bool tokenized = false; 2143 2144 if (pinfo->prefix_len == 64) { 2145 memcpy(&addr, &pinfo->prefix, 8); 2146 2147 if (!ipv6_addr_any(&in6_dev->token)) { 2148 read_lock_bh(&in6_dev->lock); 2149 memcpy(addr.s6_addr + 8, 2150 in6_dev->token.s6_addr + 8, 8); 2151 read_unlock_bh(&in6_dev->lock); 2152 tokenized = true; 2153 } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) && 2154 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) { 2155 in6_dev_put(in6_dev); 2156 return; 2157 } 2158 goto ok; 2159 } 2160 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n", 2161 pinfo->prefix_len); 2162 in6_dev_put(in6_dev); 2163 return; 2164 2165 ok: 2166 2167 ifp = ipv6_get_ifaddr(net, &addr, dev, 1); 2168 2169 if (ifp == NULL && valid_lft) { 2170 int max_addresses = in6_dev->cnf.max_addresses; 2171 u32 addr_flags = 0; 2172 2173 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 2174 if (in6_dev->cnf.optimistic_dad && 2175 !net->ipv6.devconf_all->forwarding && sllao) 2176 addr_flags = IFA_F_OPTIMISTIC; 2177 #endif 2178 2179 /* Do not allow to create too much of autoconfigured 2180 * addresses; this would be too easy way to crash kernel. 2181 */ 2182 if (!max_addresses || 2183 ipv6_count_addresses(in6_dev) < max_addresses) 2184 ifp = ipv6_add_addr(in6_dev, &addr, NULL, 2185 pinfo->prefix_len, 2186 addr_type&IPV6_ADDR_SCOPE_MASK, 2187 addr_flags, valid_lft, 2188 prefered_lft); 2189 2190 if (IS_ERR_OR_NULL(ifp)) { 2191 in6_dev_put(in6_dev); 2192 return; 2193 } 2194 2195 update_lft = 0; 2196 create = 1; 2197 ifp->cstamp = jiffies; 2198 ifp->tokenized = tokenized; 2199 addrconf_dad_start(ifp); 2200 } 2201 2202 if (ifp) { 2203 int flags; 2204 unsigned long now; 2205 #ifdef CONFIG_IPV6_PRIVACY 2206 struct inet6_ifaddr *ift; 2207 #endif 2208 u32 stored_lft; 2209 2210 /* update lifetime (RFC2462 5.5.3 e) */ 2211 spin_lock(&ifp->lock); 2212 now = jiffies; 2213 if (ifp->valid_lft > (now - ifp->tstamp) / HZ) 2214 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ; 2215 else 2216 stored_lft = 0; 2217 if (!update_lft && !create && stored_lft) { 2218 if (valid_lft > MIN_VALID_LIFETIME || 2219 valid_lft > stored_lft) 2220 update_lft = 1; 2221 else if (stored_lft <= MIN_VALID_LIFETIME) { 2222 /* valid_lft <= stored_lft is always true */ 2223 /* 2224 * RFC 4862 Section 5.5.3e: 2225 * "Note that the preferred lifetime of 2226 * the corresponding address is always 2227 * reset to the Preferred Lifetime in 2228 * the received Prefix Information 2229 * option, regardless of whether the 2230 * valid lifetime is also reset or 2231 * ignored." 2232 * 2233 * So if the preferred lifetime in 2234 * this advertisement is different 2235 * than what we have stored, but the 2236 * valid lifetime is invalid, just 2237 * reset prefered_lft. 2238 * 2239 * We must set the valid lifetime 2240 * to the stored lifetime since we'll 2241 * be updating the timestamp below, 2242 * else we'll set it back to the 2243 * minimum. 2244 */ 2245 if (prefered_lft != ifp->prefered_lft) { 2246 valid_lft = stored_lft; 2247 update_lft = 1; 2248 } 2249 } else { 2250 valid_lft = MIN_VALID_LIFETIME; 2251 if (valid_lft < prefered_lft) 2252 prefered_lft = valid_lft; 2253 update_lft = 1; 2254 } 2255 } 2256 2257 if (update_lft) { 2258 ifp->valid_lft = valid_lft; 2259 ifp->prefered_lft = prefered_lft; 2260 ifp->tstamp = now; 2261 flags = ifp->flags; 2262 ifp->flags &= ~IFA_F_DEPRECATED; 2263 spin_unlock(&ifp->lock); 2264 2265 if (!(flags&IFA_F_TENTATIVE)) 2266 ipv6_ifa_notify(0, ifp); 2267 } else 2268 spin_unlock(&ifp->lock); 2269 2270 #ifdef CONFIG_IPV6_PRIVACY 2271 read_lock_bh(&in6_dev->lock); 2272 /* update all temporary addresses in the list */ 2273 list_for_each_entry(ift, &in6_dev->tempaddr_list, 2274 tmp_list) { 2275 int age, max_valid, max_prefered; 2276 2277 if (ifp != ift->ifpub) 2278 continue; 2279 2280 /* 2281 * RFC 4941 section 3.3: 2282 * If a received option will extend the lifetime 2283 * of a public address, the lifetimes of 2284 * temporary addresses should be extended, 2285 * subject to the overall constraint that no 2286 * temporary addresses should ever remain 2287 * "valid" or "preferred" for a time longer than 2288 * (TEMP_VALID_LIFETIME) or 2289 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), 2290 * respectively. 2291 */ 2292 age = (now - ift->cstamp) / HZ; 2293 max_valid = in6_dev->cnf.temp_valid_lft - age; 2294 if (max_valid < 0) 2295 max_valid = 0; 2296 2297 max_prefered = in6_dev->cnf.temp_prefered_lft - 2298 in6_dev->cnf.max_desync_factor - 2299 age; 2300 if (max_prefered < 0) 2301 max_prefered = 0; 2302 2303 if (valid_lft > max_valid) 2304 valid_lft = max_valid; 2305 2306 if (prefered_lft > max_prefered) 2307 prefered_lft = max_prefered; 2308 2309 spin_lock(&ift->lock); 2310 flags = ift->flags; 2311 ift->valid_lft = valid_lft; 2312 ift->prefered_lft = prefered_lft; 2313 ift->tstamp = now; 2314 if (prefered_lft > 0) 2315 ift->flags &= ~IFA_F_DEPRECATED; 2316 2317 spin_unlock(&ift->lock); 2318 if (!(flags&IFA_F_TENTATIVE)) 2319 ipv6_ifa_notify(0, ift); 2320 } 2321 2322 if ((create || list_empty(&in6_dev->tempaddr_list)) && in6_dev->cnf.use_tempaddr > 0) { 2323 /* 2324 * When a new public address is created as 2325 * described in [ADDRCONF], also create a new 2326 * temporary address. Also create a temporary 2327 * address if it's enabled but no temporary 2328 * address currently exists. 2329 */ 2330 read_unlock_bh(&in6_dev->lock); 2331 ipv6_create_tempaddr(ifp, NULL); 2332 } else { 2333 read_unlock_bh(&in6_dev->lock); 2334 } 2335 #endif 2336 in6_ifa_put(ifp); 2337 addrconf_verify(0); 2338 } 2339 } 2340 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo); 2341 in6_dev_put(in6_dev); 2342 } 2343 2344 /* 2345 * Set destination address. 2346 * Special case for SIT interfaces where we create a new "virtual" 2347 * device. 2348 */ 2349 int addrconf_set_dstaddr(struct net *net, void __user *arg) 2350 { 2351 struct in6_ifreq ireq; 2352 struct net_device *dev; 2353 int err = -EINVAL; 2354 2355 rtnl_lock(); 2356 2357 err = -EFAULT; 2358 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2359 goto err_exit; 2360 2361 dev = __dev_get_by_index(net, ireq.ifr6_ifindex); 2362 2363 err = -ENODEV; 2364 if (dev == NULL) 2365 goto err_exit; 2366 2367 #if IS_ENABLED(CONFIG_IPV6_SIT) 2368 if (dev->type == ARPHRD_SIT) { 2369 const struct net_device_ops *ops = dev->netdev_ops; 2370 struct ifreq ifr; 2371 struct ip_tunnel_parm p; 2372 2373 err = -EADDRNOTAVAIL; 2374 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4)) 2375 goto err_exit; 2376 2377 memset(&p, 0, sizeof(p)); 2378 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3]; 2379 p.iph.saddr = 0; 2380 p.iph.version = 4; 2381 p.iph.ihl = 5; 2382 p.iph.protocol = IPPROTO_IPV6; 2383 p.iph.ttl = 64; 2384 ifr.ifr_ifru.ifru_data = (__force void __user *)&p; 2385 2386 if (ops->ndo_do_ioctl) { 2387 mm_segment_t oldfs = get_fs(); 2388 2389 set_fs(KERNEL_DS); 2390 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL); 2391 set_fs(oldfs); 2392 } else 2393 err = -EOPNOTSUPP; 2394 2395 if (err == 0) { 2396 err = -ENOBUFS; 2397 dev = __dev_get_by_name(net, p.name); 2398 if (!dev) 2399 goto err_exit; 2400 err = dev_open(dev); 2401 } 2402 } 2403 #endif 2404 2405 err_exit: 2406 rtnl_unlock(); 2407 return err; 2408 } 2409 2410 /* 2411 * Manual configuration of address on an interface 2412 */ 2413 static int inet6_addr_add(struct net *net, int ifindex, const struct in6_addr *pfx, 2414 const struct in6_addr *peer_pfx, 2415 unsigned int plen, __u8 ifa_flags, __u32 prefered_lft, 2416 __u32 valid_lft) 2417 { 2418 struct inet6_ifaddr *ifp; 2419 struct inet6_dev *idev; 2420 struct net_device *dev; 2421 int scope; 2422 u32 flags; 2423 clock_t expires; 2424 unsigned long timeout; 2425 2426 ASSERT_RTNL(); 2427 2428 if (plen > 128) 2429 return -EINVAL; 2430 2431 /* check the lifetime */ 2432 if (!valid_lft || prefered_lft > valid_lft) 2433 return -EINVAL; 2434 2435 dev = __dev_get_by_index(net, ifindex); 2436 if (!dev) 2437 return -ENODEV; 2438 2439 idev = addrconf_add_dev(dev); 2440 if (IS_ERR(idev)) 2441 return PTR_ERR(idev); 2442 2443 scope = ipv6_addr_scope(pfx); 2444 2445 timeout = addrconf_timeout_fixup(valid_lft, HZ); 2446 if (addrconf_finite_timeout(timeout)) { 2447 expires = jiffies_to_clock_t(timeout * HZ); 2448 valid_lft = timeout; 2449 flags = RTF_EXPIRES; 2450 } else { 2451 expires = 0; 2452 flags = 0; 2453 ifa_flags |= IFA_F_PERMANENT; 2454 } 2455 2456 timeout = addrconf_timeout_fixup(prefered_lft, HZ); 2457 if (addrconf_finite_timeout(timeout)) { 2458 if (timeout == 0) 2459 ifa_flags |= IFA_F_DEPRECATED; 2460 prefered_lft = timeout; 2461 } 2462 2463 ifp = ipv6_add_addr(idev, pfx, peer_pfx, plen, scope, ifa_flags, 2464 valid_lft, prefered_lft); 2465 2466 if (!IS_ERR(ifp)) { 2467 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev, 2468 expires, flags); 2469 /* 2470 * Note that section 3.1 of RFC 4429 indicates 2471 * that the Optimistic flag should not be set for 2472 * manually configured addresses 2473 */ 2474 addrconf_dad_start(ifp); 2475 in6_ifa_put(ifp); 2476 addrconf_verify(0); 2477 return 0; 2478 } 2479 2480 return PTR_ERR(ifp); 2481 } 2482 2483 static int inet6_addr_del(struct net *net, int ifindex, const struct in6_addr *pfx, 2484 unsigned int plen) 2485 { 2486 struct inet6_ifaddr *ifp; 2487 struct inet6_dev *idev; 2488 struct net_device *dev; 2489 2490 if (plen > 128) 2491 return -EINVAL; 2492 2493 dev = __dev_get_by_index(net, ifindex); 2494 if (!dev) 2495 return -ENODEV; 2496 2497 if ((idev = __in6_dev_get(dev)) == NULL) 2498 return -ENXIO; 2499 2500 read_lock_bh(&idev->lock); 2501 list_for_each_entry(ifp, &idev->addr_list, if_list) { 2502 if (ifp->prefix_len == plen && 2503 ipv6_addr_equal(pfx, &ifp->addr)) { 2504 in6_ifa_hold(ifp); 2505 read_unlock_bh(&idev->lock); 2506 2507 ipv6_del_addr(ifp); 2508 return 0; 2509 } 2510 } 2511 read_unlock_bh(&idev->lock); 2512 return -EADDRNOTAVAIL; 2513 } 2514 2515 2516 int addrconf_add_ifaddr(struct net *net, void __user *arg) 2517 { 2518 struct in6_ifreq ireq; 2519 int err; 2520 2521 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 2522 return -EPERM; 2523 2524 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2525 return -EFAULT; 2526 2527 rtnl_lock(); 2528 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, NULL, 2529 ireq.ifr6_prefixlen, IFA_F_PERMANENT, 2530 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME); 2531 rtnl_unlock(); 2532 return err; 2533 } 2534 2535 int addrconf_del_ifaddr(struct net *net, void __user *arg) 2536 { 2537 struct in6_ifreq ireq; 2538 int err; 2539 2540 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 2541 return -EPERM; 2542 2543 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2544 return -EFAULT; 2545 2546 rtnl_lock(); 2547 err = inet6_addr_del(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, 2548 ireq.ifr6_prefixlen); 2549 rtnl_unlock(); 2550 return err; 2551 } 2552 2553 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr, 2554 int plen, int scope) 2555 { 2556 struct inet6_ifaddr *ifp; 2557 2558 ifp = ipv6_add_addr(idev, addr, NULL, plen, 2559 scope, IFA_F_PERMANENT, 0, 0); 2560 if (!IS_ERR(ifp)) { 2561 spin_lock_bh(&ifp->lock); 2562 ifp->flags &= ~IFA_F_TENTATIVE; 2563 spin_unlock_bh(&ifp->lock); 2564 ipv6_ifa_notify(RTM_NEWADDR, ifp); 2565 in6_ifa_put(ifp); 2566 } 2567 } 2568 2569 #if IS_ENABLED(CONFIG_IPV6_SIT) 2570 static void sit_add_v4_addrs(struct inet6_dev *idev) 2571 { 2572 struct in6_addr addr; 2573 struct net_device *dev; 2574 struct net *net = dev_net(idev->dev); 2575 int scope; 2576 2577 ASSERT_RTNL(); 2578 2579 memset(&addr, 0, sizeof(struct in6_addr)); 2580 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4); 2581 2582 if (idev->dev->flags&IFF_POINTOPOINT) { 2583 addr.s6_addr32[0] = htonl(0xfe800000); 2584 scope = IFA_LINK; 2585 } else { 2586 scope = IPV6_ADDR_COMPATv4; 2587 } 2588 2589 if (addr.s6_addr32[3]) { 2590 add_addr(idev, &addr, 128, scope); 2591 return; 2592 } 2593 2594 for_each_netdev(net, dev) { 2595 struct in_device *in_dev = __in_dev_get_rtnl(dev); 2596 if (in_dev && (dev->flags & IFF_UP)) { 2597 struct in_ifaddr *ifa; 2598 2599 int flag = scope; 2600 2601 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) { 2602 int plen; 2603 2604 addr.s6_addr32[3] = ifa->ifa_local; 2605 2606 if (ifa->ifa_scope == RT_SCOPE_LINK) 2607 continue; 2608 if (ifa->ifa_scope >= RT_SCOPE_HOST) { 2609 if (idev->dev->flags&IFF_POINTOPOINT) 2610 continue; 2611 flag |= IFA_HOST; 2612 } 2613 if (idev->dev->flags&IFF_POINTOPOINT) 2614 plen = 64; 2615 else 2616 plen = 96; 2617 2618 add_addr(idev, &addr, plen, flag); 2619 } 2620 } 2621 } 2622 } 2623 #endif 2624 2625 static void init_loopback(struct net_device *dev) 2626 { 2627 struct inet6_dev *idev; 2628 struct net_device *sp_dev; 2629 struct inet6_ifaddr *sp_ifa; 2630 struct rt6_info *sp_rt; 2631 2632 /* ::1 */ 2633 2634 ASSERT_RTNL(); 2635 2636 if ((idev = ipv6_find_idev(dev)) == NULL) { 2637 pr_debug("%s: add_dev failed\n", __func__); 2638 return; 2639 } 2640 2641 add_addr(idev, &in6addr_loopback, 128, IFA_HOST); 2642 2643 /* Add routes to other interface's IPv6 addresses */ 2644 for_each_netdev(dev_net(dev), sp_dev) { 2645 if (!strcmp(sp_dev->name, dev->name)) 2646 continue; 2647 2648 idev = __in6_dev_get(sp_dev); 2649 if (!idev) 2650 continue; 2651 2652 read_lock_bh(&idev->lock); 2653 list_for_each_entry(sp_ifa, &idev->addr_list, if_list) { 2654 2655 if (sp_ifa->flags & (IFA_F_DADFAILED | IFA_F_TENTATIVE)) 2656 continue; 2657 2658 if (sp_ifa->rt) 2659 continue; 2660 2661 sp_rt = addrconf_dst_alloc(idev, &sp_ifa->addr, 0); 2662 2663 /* Failure cases are ignored */ 2664 if (!IS_ERR(sp_rt)) { 2665 sp_ifa->rt = sp_rt; 2666 ip6_ins_rt(sp_rt); 2667 } 2668 } 2669 read_unlock_bh(&idev->lock); 2670 } 2671 } 2672 2673 static void addrconf_add_linklocal(struct inet6_dev *idev, const struct in6_addr *addr) 2674 { 2675 struct inet6_ifaddr *ifp; 2676 u32 addr_flags = IFA_F_PERMANENT; 2677 2678 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 2679 if (idev->cnf.optimistic_dad && 2680 !dev_net(idev->dev)->ipv6.devconf_all->forwarding) 2681 addr_flags |= IFA_F_OPTIMISTIC; 2682 #endif 2683 2684 2685 ifp = ipv6_add_addr(idev, addr, NULL, 64, IFA_LINK, addr_flags, 0, 0); 2686 if (!IS_ERR(ifp)) { 2687 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0); 2688 addrconf_dad_start(ifp); 2689 in6_ifa_put(ifp); 2690 } 2691 } 2692 2693 static void addrconf_dev_config(struct net_device *dev) 2694 { 2695 struct in6_addr addr; 2696 struct inet6_dev *idev; 2697 2698 ASSERT_RTNL(); 2699 2700 if ((dev->type != ARPHRD_ETHER) && 2701 (dev->type != ARPHRD_FDDI) && 2702 (dev->type != ARPHRD_ARCNET) && 2703 (dev->type != ARPHRD_INFINIBAND) && 2704 (dev->type != ARPHRD_IEEE802154) && 2705 (dev->type != ARPHRD_IEEE1394)) { 2706 /* Alas, we support only Ethernet autoconfiguration. */ 2707 return; 2708 } 2709 2710 idev = addrconf_add_dev(dev); 2711 if (IS_ERR(idev)) 2712 return; 2713 2714 memset(&addr, 0, sizeof(struct in6_addr)); 2715 addr.s6_addr32[0] = htonl(0xFE800000); 2716 2717 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0) 2718 addrconf_add_linklocal(idev, &addr); 2719 } 2720 2721 #if IS_ENABLED(CONFIG_IPV6_SIT) 2722 static void addrconf_sit_config(struct net_device *dev) 2723 { 2724 struct inet6_dev *idev; 2725 2726 ASSERT_RTNL(); 2727 2728 /* 2729 * Configure the tunnel with one of our IPv4 2730 * addresses... we should configure all of 2731 * our v4 addrs in the tunnel 2732 */ 2733 2734 if ((idev = ipv6_find_idev(dev)) == NULL) { 2735 pr_debug("%s: add_dev failed\n", __func__); 2736 return; 2737 } 2738 2739 if (dev->priv_flags & IFF_ISATAP) { 2740 struct in6_addr addr; 2741 2742 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0); 2743 addrconf_prefix_route(&addr, 64, dev, 0, 0); 2744 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev)) 2745 addrconf_add_linklocal(idev, &addr); 2746 return; 2747 } 2748 2749 sit_add_v4_addrs(idev); 2750 2751 if (dev->flags&IFF_POINTOPOINT) 2752 addrconf_add_mroute(dev); 2753 else 2754 sit_route_add(dev); 2755 } 2756 #endif 2757 2758 #if IS_ENABLED(CONFIG_NET_IPGRE) 2759 static void addrconf_gre_config(struct net_device *dev) 2760 { 2761 struct inet6_dev *idev; 2762 struct in6_addr addr; 2763 2764 ASSERT_RTNL(); 2765 2766 if ((idev = ipv6_find_idev(dev)) == NULL) { 2767 pr_debug("%s: add_dev failed\n", __func__); 2768 return; 2769 } 2770 2771 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0); 2772 addrconf_prefix_route(&addr, 64, dev, 0, 0); 2773 2774 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev)) 2775 addrconf_add_linklocal(idev, &addr); 2776 } 2777 #endif 2778 2779 static inline int 2780 ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev) 2781 { 2782 struct in6_addr lladdr; 2783 2784 if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) { 2785 addrconf_add_linklocal(idev, &lladdr); 2786 return 0; 2787 } 2788 return -1; 2789 } 2790 2791 static void ip6_tnl_add_linklocal(struct inet6_dev *idev) 2792 { 2793 struct net_device *link_dev; 2794 struct net *net = dev_net(idev->dev); 2795 2796 /* first try to inherit the link-local address from the link device */ 2797 if (idev->dev->iflink && 2798 (link_dev = __dev_get_by_index(net, idev->dev->iflink))) { 2799 if (!ipv6_inherit_linklocal(idev, link_dev)) 2800 return; 2801 } 2802 /* then try to inherit it from any device */ 2803 for_each_netdev(net, link_dev) { 2804 if (!ipv6_inherit_linklocal(idev, link_dev)) 2805 return; 2806 } 2807 pr_debug("init ip6-ip6: add_linklocal failed\n"); 2808 } 2809 2810 /* 2811 * Autoconfigure tunnel with a link-local address so routing protocols, 2812 * DHCPv6, MLD etc. can be run over the virtual link 2813 */ 2814 2815 static void addrconf_ip6_tnl_config(struct net_device *dev) 2816 { 2817 struct inet6_dev *idev; 2818 2819 ASSERT_RTNL(); 2820 2821 idev = addrconf_add_dev(dev); 2822 if (IS_ERR(idev)) { 2823 pr_debug("init ip6-ip6: add_dev failed\n"); 2824 return; 2825 } 2826 ip6_tnl_add_linklocal(idev); 2827 } 2828 2829 static int addrconf_notify(struct notifier_block *this, unsigned long event, 2830 void *ptr) 2831 { 2832 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 2833 struct inet6_dev *idev = __in6_dev_get(dev); 2834 int run_pending = 0; 2835 int err; 2836 2837 switch (event) { 2838 case NETDEV_REGISTER: 2839 if (!idev && dev->mtu >= IPV6_MIN_MTU) { 2840 idev = ipv6_add_dev(dev); 2841 if (!idev) 2842 return notifier_from_errno(-ENOMEM); 2843 } 2844 break; 2845 2846 case NETDEV_UP: 2847 case NETDEV_CHANGE: 2848 if (dev->flags & IFF_SLAVE) 2849 break; 2850 2851 if (event == NETDEV_UP) { 2852 if (!addrconf_qdisc_ok(dev)) { 2853 /* device is not ready yet. */ 2854 pr_info("ADDRCONF(NETDEV_UP): %s: link is not ready\n", 2855 dev->name); 2856 break; 2857 } 2858 2859 if (!idev && dev->mtu >= IPV6_MIN_MTU) 2860 idev = ipv6_add_dev(dev); 2861 2862 if (idev) { 2863 idev->if_flags |= IF_READY; 2864 run_pending = 1; 2865 } 2866 } else { 2867 if (!addrconf_qdisc_ok(dev)) { 2868 /* device is still not ready. */ 2869 break; 2870 } 2871 2872 if (idev) { 2873 if (idev->if_flags & IF_READY) 2874 /* device is already configured. */ 2875 break; 2876 idev->if_flags |= IF_READY; 2877 } 2878 2879 pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n", 2880 dev->name); 2881 2882 run_pending = 1; 2883 } 2884 2885 switch (dev->type) { 2886 #if IS_ENABLED(CONFIG_IPV6_SIT) 2887 case ARPHRD_SIT: 2888 addrconf_sit_config(dev); 2889 break; 2890 #endif 2891 #if IS_ENABLED(CONFIG_NET_IPGRE) 2892 case ARPHRD_IPGRE: 2893 addrconf_gre_config(dev); 2894 break; 2895 #endif 2896 case ARPHRD_TUNNEL6: 2897 addrconf_ip6_tnl_config(dev); 2898 break; 2899 case ARPHRD_LOOPBACK: 2900 init_loopback(dev); 2901 break; 2902 2903 default: 2904 addrconf_dev_config(dev); 2905 break; 2906 } 2907 2908 if (idev) { 2909 if (run_pending) 2910 addrconf_dad_run(idev); 2911 2912 /* 2913 * If the MTU changed during the interface down, 2914 * when the interface up, the changed MTU must be 2915 * reflected in the idev as well as routers. 2916 */ 2917 if (idev->cnf.mtu6 != dev->mtu && 2918 dev->mtu >= IPV6_MIN_MTU) { 2919 rt6_mtu_change(dev, dev->mtu); 2920 idev->cnf.mtu6 = dev->mtu; 2921 } 2922 idev->tstamp = jiffies; 2923 inet6_ifinfo_notify(RTM_NEWLINK, idev); 2924 2925 /* 2926 * If the changed mtu during down is lower than 2927 * IPV6_MIN_MTU stop IPv6 on this interface. 2928 */ 2929 if (dev->mtu < IPV6_MIN_MTU) 2930 addrconf_ifdown(dev, 1); 2931 } 2932 break; 2933 2934 case NETDEV_CHANGEMTU: 2935 if (idev && dev->mtu >= IPV6_MIN_MTU) { 2936 rt6_mtu_change(dev, dev->mtu); 2937 idev->cnf.mtu6 = dev->mtu; 2938 break; 2939 } 2940 2941 if (!idev && dev->mtu >= IPV6_MIN_MTU) { 2942 idev = ipv6_add_dev(dev); 2943 if (idev) 2944 break; 2945 } 2946 2947 /* 2948 * MTU falled under IPV6_MIN_MTU. 2949 * Stop IPv6 on this interface. 2950 */ 2951 2952 case NETDEV_DOWN: 2953 case NETDEV_UNREGISTER: 2954 /* 2955 * Remove all addresses from this interface. 2956 */ 2957 addrconf_ifdown(dev, event != NETDEV_DOWN); 2958 break; 2959 2960 case NETDEV_CHANGENAME: 2961 if (idev) { 2962 snmp6_unregister_dev(idev); 2963 addrconf_sysctl_unregister(idev); 2964 addrconf_sysctl_register(idev); 2965 err = snmp6_register_dev(idev); 2966 if (err) 2967 return notifier_from_errno(err); 2968 } 2969 break; 2970 2971 case NETDEV_PRE_TYPE_CHANGE: 2972 case NETDEV_POST_TYPE_CHANGE: 2973 addrconf_type_change(dev, event); 2974 break; 2975 } 2976 2977 return NOTIFY_OK; 2978 } 2979 2980 /* 2981 * addrconf module should be notified of a device going up 2982 */ 2983 static struct notifier_block ipv6_dev_notf = { 2984 .notifier_call = addrconf_notify, 2985 }; 2986 2987 static void addrconf_type_change(struct net_device *dev, unsigned long event) 2988 { 2989 struct inet6_dev *idev; 2990 ASSERT_RTNL(); 2991 2992 idev = __in6_dev_get(dev); 2993 2994 if (event == NETDEV_POST_TYPE_CHANGE) 2995 ipv6_mc_remap(idev); 2996 else if (event == NETDEV_PRE_TYPE_CHANGE) 2997 ipv6_mc_unmap(idev); 2998 } 2999 3000 static int addrconf_ifdown(struct net_device *dev, int how) 3001 { 3002 struct net *net = dev_net(dev); 3003 struct inet6_dev *idev; 3004 struct inet6_ifaddr *ifa; 3005 int state, i; 3006 3007 ASSERT_RTNL(); 3008 3009 rt6_ifdown(net, dev); 3010 neigh_ifdown(&nd_tbl, dev); 3011 3012 idev = __in6_dev_get(dev); 3013 if (idev == NULL) 3014 return -ENODEV; 3015 3016 /* 3017 * Step 1: remove reference to ipv6 device from parent device. 3018 * Do not dev_put! 3019 */ 3020 if (how) { 3021 idev->dead = 1; 3022 3023 /* protected by rtnl_lock */ 3024 RCU_INIT_POINTER(dev->ip6_ptr, NULL); 3025 3026 /* Step 1.5: remove snmp6 entry */ 3027 snmp6_unregister_dev(idev); 3028 3029 } 3030 3031 /* Step 2: clear hash table */ 3032 for (i = 0; i < IN6_ADDR_HSIZE; i++) { 3033 struct hlist_head *h = &inet6_addr_lst[i]; 3034 3035 spin_lock_bh(&addrconf_hash_lock); 3036 restart: 3037 hlist_for_each_entry_rcu(ifa, h, addr_lst) { 3038 if (ifa->idev == idev) { 3039 hlist_del_init_rcu(&ifa->addr_lst); 3040 addrconf_del_dad_timer(ifa); 3041 goto restart; 3042 } 3043 } 3044 spin_unlock_bh(&addrconf_hash_lock); 3045 } 3046 3047 write_lock_bh(&idev->lock); 3048 3049 addrconf_del_rs_timer(idev); 3050 3051 /* Step 2: clear flags for stateless addrconf */ 3052 if (!how) 3053 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY); 3054 3055 #ifdef CONFIG_IPV6_PRIVACY 3056 if (how && del_timer(&idev->regen_timer)) 3057 in6_dev_put(idev); 3058 3059 /* Step 3: clear tempaddr list */ 3060 while (!list_empty(&idev->tempaddr_list)) { 3061 ifa = list_first_entry(&idev->tempaddr_list, 3062 struct inet6_ifaddr, tmp_list); 3063 list_del(&ifa->tmp_list); 3064 write_unlock_bh(&idev->lock); 3065 spin_lock_bh(&ifa->lock); 3066 3067 if (ifa->ifpub) { 3068 in6_ifa_put(ifa->ifpub); 3069 ifa->ifpub = NULL; 3070 } 3071 spin_unlock_bh(&ifa->lock); 3072 in6_ifa_put(ifa); 3073 write_lock_bh(&idev->lock); 3074 } 3075 #endif 3076 3077 while (!list_empty(&idev->addr_list)) { 3078 ifa = list_first_entry(&idev->addr_list, 3079 struct inet6_ifaddr, if_list); 3080 addrconf_del_dad_timer(ifa); 3081 3082 list_del(&ifa->if_list); 3083 3084 write_unlock_bh(&idev->lock); 3085 3086 spin_lock_bh(&ifa->state_lock); 3087 state = ifa->state; 3088 ifa->state = INET6_IFADDR_STATE_DEAD; 3089 spin_unlock_bh(&ifa->state_lock); 3090 3091 if (state != INET6_IFADDR_STATE_DEAD) { 3092 __ipv6_ifa_notify(RTM_DELADDR, ifa); 3093 inet6addr_notifier_call_chain(NETDEV_DOWN, ifa); 3094 } 3095 in6_ifa_put(ifa); 3096 3097 write_lock_bh(&idev->lock); 3098 } 3099 3100 write_unlock_bh(&idev->lock); 3101 3102 /* Step 5: Discard multicast list */ 3103 if (how) 3104 ipv6_mc_destroy_dev(idev); 3105 else 3106 ipv6_mc_down(idev); 3107 3108 idev->tstamp = jiffies; 3109 3110 /* Last: Shot the device (if unregistered) */ 3111 if (how) { 3112 addrconf_sysctl_unregister(idev); 3113 neigh_parms_release(&nd_tbl, idev->nd_parms); 3114 neigh_ifdown(&nd_tbl, dev); 3115 in6_dev_put(idev); 3116 } 3117 return 0; 3118 } 3119 3120 static void addrconf_rs_timer(unsigned long data) 3121 { 3122 struct inet6_dev *idev = (struct inet6_dev *)data; 3123 struct in6_addr lladdr; 3124 3125 write_lock(&idev->lock); 3126 if (idev->dead || !(idev->if_flags & IF_READY)) 3127 goto out; 3128 3129 if (!ipv6_accept_ra(idev)) 3130 goto out; 3131 3132 /* Announcement received after solicitation was sent */ 3133 if (idev->if_flags & IF_RA_RCVD) 3134 goto out; 3135 3136 if (idev->rs_probes++ < idev->cnf.rtr_solicits) { 3137 if (!__ipv6_get_lladdr(idev, &lladdr, IFA_F_TENTATIVE)) 3138 ndisc_send_rs(idev->dev, &lladdr, 3139 &in6addr_linklocal_allrouters); 3140 else 3141 goto out; 3142 3143 /* The wait after the last probe can be shorter */ 3144 addrconf_mod_rs_timer(idev, (idev->rs_probes == 3145 idev->cnf.rtr_solicits) ? 3146 idev->cnf.rtr_solicit_delay : 3147 idev->cnf.rtr_solicit_interval); 3148 } else { 3149 /* 3150 * Note: we do not support deprecated "all on-link" 3151 * assumption any longer. 3152 */ 3153 pr_debug("%s: no IPv6 routers present\n", idev->dev->name); 3154 } 3155 3156 out: 3157 write_unlock(&idev->lock); 3158 in6_dev_put(idev); 3159 } 3160 3161 /* 3162 * Duplicate Address Detection 3163 */ 3164 static void addrconf_dad_kick(struct inet6_ifaddr *ifp) 3165 { 3166 unsigned long rand_num; 3167 struct inet6_dev *idev = ifp->idev; 3168 3169 if (ifp->flags & IFA_F_OPTIMISTIC) 3170 rand_num = 0; 3171 else 3172 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1); 3173 3174 ifp->dad_probes = idev->cnf.dad_transmits; 3175 addrconf_mod_dad_timer(ifp, rand_num); 3176 } 3177 3178 static void addrconf_dad_start(struct inet6_ifaddr *ifp) 3179 { 3180 struct inet6_dev *idev = ifp->idev; 3181 struct net_device *dev = idev->dev; 3182 3183 addrconf_join_solict(dev, &ifp->addr); 3184 3185 net_srandom(ifp->addr.s6_addr32[3]); 3186 3187 read_lock_bh(&idev->lock); 3188 spin_lock(&ifp->lock); 3189 if (ifp->state == INET6_IFADDR_STATE_DEAD) 3190 goto out; 3191 3192 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) || 3193 idev->cnf.accept_dad < 1 || 3194 !(ifp->flags&IFA_F_TENTATIVE) || 3195 ifp->flags & IFA_F_NODAD) { 3196 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED); 3197 spin_unlock(&ifp->lock); 3198 read_unlock_bh(&idev->lock); 3199 3200 addrconf_dad_completed(ifp); 3201 return; 3202 } 3203 3204 if (!(idev->if_flags & IF_READY)) { 3205 spin_unlock(&ifp->lock); 3206 read_unlock_bh(&idev->lock); 3207 /* 3208 * If the device is not ready: 3209 * - keep it tentative if it is a permanent address. 3210 * - otherwise, kill it. 3211 */ 3212 in6_ifa_hold(ifp); 3213 addrconf_dad_stop(ifp, 0); 3214 return; 3215 } 3216 3217 /* 3218 * Optimistic nodes can start receiving 3219 * Frames right away 3220 */ 3221 if (ifp->flags & IFA_F_OPTIMISTIC) 3222 ip6_ins_rt(ifp->rt); 3223 3224 addrconf_dad_kick(ifp); 3225 out: 3226 spin_unlock(&ifp->lock); 3227 read_unlock_bh(&idev->lock); 3228 } 3229 3230 static void addrconf_dad_timer(unsigned long data) 3231 { 3232 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data; 3233 struct inet6_dev *idev = ifp->idev; 3234 struct in6_addr mcaddr; 3235 3236 if (!ifp->dad_probes && addrconf_dad_end(ifp)) 3237 goto out; 3238 3239 write_lock(&idev->lock); 3240 if (idev->dead || !(idev->if_flags & IF_READY)) { 3241 write_unlock(&idev->lock); 3242 goto out; 3243 } 3244 3245 spin_lock(&ifp->lock); 3246 if (ifp->state == INET6_IFADDR_STATE_DEAD) { 3247 spin_unlock(&ifp->lock); 3248 write_unlock(&idev->lock); 3249 goto out; 3250 } 3251 3252 if (ifp->dad_probes == 0) { 3253 /* 3254 * DAD was successful 3255 */ 3256 3257 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED); 3258 spin_unlock(&ifp->lock); 3259 write_unlock(&idev->lock); 3260 3261 addrconf_dad_completed(ifp); 3262 3263 goto out; 3264 } 3265 3266 ifp->dad_probes--; 3267 addrconf_mod_dad_timer(ifp, ifp->idev->nd_parms->retrans_time); 3268 spin_unlock(&ifp->lock); 3269 write_unlock(&idev->lock); 3270 3271 /* send a neighbour solicitation for our addr */ 3272 addrconf_addr_solict_mult(&ifp->addr, &mcaddr); 3273 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &in6addr_any); 3274 out: 3275 in6_ifa_put(ifp); 3276 } 3277 3278 static void addrconf_dad_completed(struct inet6_ifaddr *ifp) 3279 { 3280 struct net_device *dev = ifp->idev->dev; 3281 struct in6_addr lladdr; 3282 bool send_rs, send_mld; 3283 3284 addrconf_del_dad_timer(ifp); 3285 3286 /* 3287 * Configure the address for reception. Now it is valid. 3288 */ 3289 3290 ipv6_ifa_notify(RTM_NEWADDR, ifp); 3291 3292 /* If added prefix is link local and we are prepared to process 3293 router advertisements, start sending router solicitations. 3294 */ 3295 3296 read_lock_bh(&ifp->idev->lock); 3297 spin_lock(&ifp->lock); 3298 send_mld = ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL && 3299 ifp->idev->valid_ll_addr_cnt == 1; 3300 send_rs = send_mld && 3301 ipv6_accept_ra(ifp->idev) && 3302 ifp->idev->cnf.rtr_solicits > 0 && 3303 (dev->flags&IFF_LOOPBACK) == 0; 3304 spin_unlock(&ifp->lock); 3305 read_unlock_bh(&ifp->idev->lock); 3306 3307 /* While dad is in progress mld report's source address is in6_addrany. 3308 * Resend with proper ll now. 3309 */ 3310 if (send_mld) 3311 ipv6_mc_dad_complete(ifp->idev); 3312 3313 if (send_rs) { 3314 /* 3315 * If a host as already performed a random delay 3316 * [...] as part of DAD [...] there is no need 3317 * to delay again before sending the first RS 3318 */ 3319 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE)) 3320 return; 3321 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters); 3322 3323 write_lock_bh(&ifp->idev->lock); 3324 spin_lock(&ifp->lock); 3325 ifp->idev->rs_probes = 1; 3326 ifp->idev->if_flags |= IF_RS_SENT; 3327 addrconf_mod_rs_timer(ifp->idev, 3328 ifp->idev->cnf.rtr_solicit_interval); 3329 spin_unlock(&ifp->lock); 3330 write_unlock_bh(&ifp->idev->lock); 3331 } 3332 } 3333 3334 static void addrconf_dad_run(struct inet6_dev *idev) 3335 { 3336 struct inet6_ifaddr *ifp; 3337 3338 read_lock_bh(&idev->lock); 3339 list_for_each_entry(ifp, &idev->addr_list, if_list) { 3340 spin_lock(&ifp->lock); 3341 if (ifp->flags & IFA_F_TENTATIVE && 3342 ifp->state == INET6_IFADDR_STATE_DAD) 3343 addrconf_dad_kick(ifp); 3344 spin_unlock(&ifp->lock); 3345 } 3346 read_unlock_bh(&idev->lock); 3347 } 3348 3349 #ifdef CONFIG_PROC_FS 3350 struct if6_iter_state { 3351 struct seq_net_private p; 3352 int bucket; 3353 int offset; 3354 }; 3355 3356 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos) 3357 { 3358 struct inet6_ifaddr *ifa = NULL; 3359 struct if6_iter_state *state = seq->private; 3360 struct net *net = seq_file_net(seq); 3361 int p = 0; 3362 3363 /* initial bucket if pos is 0 */ 3364 if (pos == 0) { 3365 state->bucket = 0; 3366 state->offset = 0; 3367 } 3368 3369 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) { 3370 hlist_for_each_entry_rcu_bh(ifa, &inet6_addr_lst[state->bucket], 3371 addr_lst) { 3372 if (!net_eq(dev_net(ifa->idev->dev), net)) 3373 continue; 3374 /* sync with offset */ 3375 if (p < state->offset) { 3376 p++; 3377 continue; 3378 } 3379 state->offset++; 3380 return ifa; 3381 } 3382 3383 /* prepare for next bucket */ 3384 state->offset = 0; 3385 p = 0; 3386 } 3387 return NULL; 3388 } 3389 3390 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, 3391 struct inet6_ifaddr *ifa) 3392 { 3393 struct if6_iter_state *state = seq->private; 3394 struct net *net = seq_file_net(seq); 3395 3396 hlist_for_each_entry_continue_rcu_bh(ifa, addr_lst) { 3397 if (!net_eq(dev_net(ifa->idev->dev), net)) 3398 continue; 3399 state->offset++; 3400 return ifa; 3401 } 3402 3403 while (++state->bucket < IN6_ADDR_HSIZE) { 3404 state->offset = 0; 3405 hlist_for_each_entry_rcu_bh(ifa, 3406 &inet6_addr_lst[state->bucket], addr_lst) { 3407 if (!net_eq(dev_net(ifa->idev->dev), net)) 3408 continue; 3409 state->offset++; 3410 return ifa; 3411 } 3412 } 3413 3414 return NULL; 3415 } 3416 3417 static void *if6_seq_start(struct seq_file *seq, loff_t *pos) 3418 __acquires(rcu_bh) 3419 { 3420 rcu_read_lock_bh(); 3421 return if6_get_first(seq, *pos); 3422 } 3423 3424 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos) 3425 { 3426 struct inet6_ifaddr *ifa; 3427 3428 ifa = if6_get_next(seq, v); 3429 ++*pos; 3430 return ifa; 3431 } 3432 3433 static void if6_seq_stop(struct seq_file *seq, void *v) 3434 __releases(rcu_bh) 3435 { 3436 rcu_read_unlock_bh(); 3437 } 3438 3439 static int if6_seq_show(struct seq_file *seq, void *v) 3440 { 3441 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v; 3442 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n", 3443 &ifp->addr, 3444 ifp->idev->dev->ifindex, 3445 ifp->prefix_len, 3446 ifp->scope, 3447 ifp->flags, 3448 ifp->idev->dev->name); 3449 return 0; 3450 } 3451 3452 static const struct seq_operations if6_seq_ops = { 3453 .start = if6_seq_start, 3454 .next = if6_seq_next, 3455 .show = if6_seq_show, 3456 .stop = if6_seq_stop, 3457 }; 3458 3459 static int if6_seq_open(struct inode *inode, struct file *file) 3460 { 3461 return seq_open_net(inode, file, &if6_seq_ops, 3462 sizeof(struct if6_iter_state)); 3463 } 3464 3465 static const struct file_operations if6_fops = { 3466 .owner = THIS_MODULE, 3467 .open = if6_seq_open, 3468 .read = seq_read, 3469 .llseek = seq_lseek, 3470 .release = seq_release_net, 3471 }; 3472 3473 static int __net_init if6_proc_net_init(struct net *net) 3474 { 3475 if (!proc_create("if_inet6", S_IRUGO, net->proc_net, &if6_fops)) 3476 return -ENOMEM; 3477 return 0; 3478 } 3479 3480 static void __net_exit if6_proc_net_exit(struct net *net) 3481 { 3482 remove_proc_entry("if_inet6", net->proc_net); 3483 } 3484 3485 static struct pernet_operations if6_proc_net_ops = { 3486 .init = if6_proc_net_init, 3487 .exit = if6_proc_net_exit, 3488 }; 3489 3490 int __init if6_proc_init(void) 3491 { 3492 return register_pernet_subsys(&if6_proc_net_ops); 3493 } 3494 3495 void if6_proc_exit(void) 3496 { 3497 unregister_pernet_subsys(&if6_proc_net_ops); 3498 } 3499 #endif /* CONFIG_PROC_FS */ 3500 3501 #if IS_ENABLED(CONFIG_IPV6_MIP6) 3502 /* Check if address is a home address configured on any interface. */ 3503 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr) 3504 { 3505 int ret = 0; 3506 struct inet6_ifaddr *ifp = NULL; 3507 unsigned int hash = inet6_addr_hash(addr); 3508 3509 rcu_read_lock_bh(); 3510 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) { 3511 if (!net_eq(dev_net(ifp->idev->dev), net)) 3512 continue; 3513 if (ipv6_addr_equal(&ifp->addr, addr) && 3514 (ifp->flags & IFA_F_HOMEADDRESS)) { 3515 ret = 1; 3516 break; 3517 } 3518 } 3519 rcu_read_unlock_bh(); 3520 return ret; 3521 } 3522 #endif 3523 3524 /* 3525 * Periodic address status verification 3526 */ 3527 3528 static void addrconf_verify(unsigned long foo) 3529 { 3530 unsigned long now, next, next_sec, next_sched; 3531 struct inet6_ifaddr *ifp; 3532 int i; 3533 3534 rcu_read_lock_bh(); 3535 spin_lock(&addrconf_verify_lock); 3536 now = jiffies; 3537 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY); 3538 3539 del_timer(&addr_chk_timer); 3540 3541 for (i = 0; i < IN6_ADDR_HSIZE; i++) { 3542 restart: 3543 hlist_for_each_entry_rcu_bh(ifp, 3544 &inet6_addr_lst[i], addr_lst) { 3545 unsigned long age; 3546 3547 if (ifp->flags & IFA_F_PERMANENT) 3548 continue; 3549 3550 spin_lock(&ifp->lock); 3551 /* We try to batch several events at once. */ 3552 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ; 3553 3554 if (ifp->valid_lft != INFINITY_LIFE_TIME && 3555 age >= ifp->valid_lft) { 3556 spin_unlock(&ifp->lock); 3557 in6_ifa_hold(ifp); 3558 ipv6_del_addr(ifp); 3559 goto restart; 3560 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) { 3561 spin_unlock(&ifp->lock); 3562 continue; 3563 } else if (age >= ifp->prefered_lft) { 3564 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */ 3565 int deprecate = 0; 3566 3567 if (!(ifp->flags&IFA_F_DEPRECATED)) { 3568 deprecate = 1; 3569 ifp->flags |= IFA_F_DEPRECATED; 3570 } 3571 3572 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next)) 3573 next = ifp->tstamp + ifp->valid_lft * HZ; 3574 3575 spin_unlock(&ifp->lock); 3576 3577 if (deprecate) { 3578 in6_ifa_hold(ifp); 3579 3580 ipv6_ifa_notify(0, ifp); 3581 in6_ifa_put(ifp); 3582 goto restart; 3583 } 3584 #ifdef CONFIG_IPV6_PRIVACY 3585 } else if ((ifp->flags&IFA_F_TEMPORARY) && 3586 !(ifp->flags&IFA_F_TENTATIVE)) { 3587 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry * 3588 ifp->idev->cnf.dad_transmits * 3589 ifp->idev->nd_parms->retrans_time / HZ; 3590 3591 if (age >= ifp->prefered_lft - regen_advance) { 3592 struct inet6_ifaddr *ifpub = ifp->ifpub; 3593 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 3594 next = ifp->tstamp + ifp->prefered_lft * HZ; 3595 if (!ifp->regen_count && ifpub) { 3596 ifp->regen_count++; 3597 in6_ifa_hold(ifp); 3598 in6_ifa_hold(ifpub); 3599 spin_unlock(&ifp->lock); 3600 3601 spin_lock(&ifpub->lock); 3602 ifpub->regen_count = 0; 3603 spin_unlock(&ifpub->lock); 3604 ipv6_create_tempaddr(ifpub, ifp); 3605 in6_ifa_put(ifpub); 3606 in6_ifa_put(ifp); 3607 goto restart; 3608 } 3609 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next)) 3610 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ; 3611 spin_unlock(&ifp->lock); 3612 #endif 3613 } else { 3614 /* ifp->prefered_lft <= ifp->valid_lft */ 3615 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 3616 next = ifp->tstamp + ifp->prefered_lft * HZ; 3617 spin_unlock(&ifp->lock); 3618 } 3619 } 3620 } 3621 3622 next_sec = round_jiffies_up(next); 3623 next_sched = next; 3624 3625 /* If rounded timeout is accurate enough, accept it. */ 3626 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ)) 3627 next_sched = next_sec; 3628 3629 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */ 3630 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX)) 3631 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX; 3632 3633 ADBG((KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n", 3634 now, next, next_sec, next_sched)); 3635 3636 addr_chk_timer.expires = next_sched; 3637 add_timer(&addr_chk_timer); 3638 spin_unlock(&addrconf_verify_lock); 3639 rcu_read_unlock_bh(); 3640 } 3641 3642 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local, 3643 struct in6_addr **peer_pfx) 3644 { 3645 struct in6_addr *pfx = NULL; 3646 3647 *peer_pfx = NULL; 3648 3649 if (addr) 3650 pfx = nla_data(addr); 3651 3652 if (local) { 3653 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx))) 3654 *peer_pfx = pfx; 3655 pfx = nla_data(local); 3656 } 3657 3658 return pfx; 3659 } 3660 3661 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = { 3662 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) }, 3663 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) }, 3664 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) }, 3665 }; 3666 3667 static int 3668 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh) 3669 { 3670 struct net *net = sock_net(skb->sk); 3671 struct ifaddrmsg *ifm; 3672 struct nlattr *tb[IFA_MAX+1]; 3673 struct in6_addr *pfx, *peer_pfx; 3674 int err; 3675 3676 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy); 3677 if (err < 0) 3678 return err; 3679 3680 ifm = nlmsg_data(nlh); 3681 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx); 3682 if (pfx == NULL) 3683 return -EINVAL; 3684 3685 return inet6_addr_del(net, ifm->ifa_index, pfx, ifm->ifa_prefixlen); 3686 } 3687 3688 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags, 3689 u32 prefered_lft, u32 valid_lft) 3690 { 3691 u32 flags; 3692 clock_t expires; 3693 unsigned long timeout; 3694 3695 if (!valid_lft || (prefered_lft > valid_lft)) 3696 return -EINVAL; 3697 3698 timeout = addrconf_timeout_fixup(valid_lft, HZ); 3699 if (addrconf_finite_timeout(timeout)) { 3700 expires = jiffies_to_clock_t(timeout * HZ); 3701 valid_lft = timeout; 3702 flags = RTF_EXPIRES; 3703 } else { 3704 expires = 0; 3705 flags = 0; 3706 ifa_flags |= IFA_F_PERMANENT; 3707 } 3708 3709 timeout = addrconf_timeout_fixup(prefered_lft, HZ); 3710 if (addrconf_finite_timeout(timeout)) { 3711 if (timeout == 0) 3712 ifa_flags |= IFA_F_DEPRECATED; 3713 prefered_lft = timeout; 3714 } 3715 3716 spin_lock_bh(&ifp->lock); 3717 ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags; 3718 ifp->tstamp = jiffies; 3719 ifp->valid_lft = valid_lft; 3720 ifp->prefered_lft = prefered_lft; 3721 3722 spin_unlock_bh(&ifp->lock); 3723 if (!(ifp->flags&IFA_F_TENTATIVE)) 3724 ipv6_ifa_notify(0, ifp); 3725 3726 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev, 3727 expires, flags); 3728 addrconf_verify(0); 3729 3730 return 0; 3731 } 3732 3733 static int 3734 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh) 3735 { 3736 struct net *net = sock_net(skb->sk); 3737 struct ifaddrmsg *ifm; 3738 struct nlattr *tb[IFA_MAX+1]; 3739 struct in6_addr *pfx, *peer_pfx; 3740 struct inet6_ifaddr *ifa; 3741 struct net_device *dev; 3742 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME; 3743 u8 ifa_flags; 3744 int err; 3745 3746 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy); 3747 if (err < 0) 3748 return err; 3749 3750 ifm = nlmsg_data(nlh); 3751 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx); 3752 if (pfx == NULL) 3753 return -EINVAL; 3754 3755 if (tb[IFA_CACHEINFO]) { 3756 struct ifa_cacheinfo *ci; 3757 3758 ci = nla_data(tb[IFA_CACHEINFO]); 3759 valid_lft = ci->ifa_valid; 3760 preferred_lft = ci->ifa_prefered; 3761 } else { 3762 preferred_lft = INFINITY_LIFE_TIME; 3763 valid_lft = INFINITY_LIFE_TIME; 3764 } 3765 3766 dev = __dev_get_by_index(net, ifm->ifa_index); 3767 if (dev == NULL) 3768 return -ENODEV; 3769 3770 /* We ignore other flags so far. */ 3771 ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS); 3772 3773 ifa = ipv6_get_ifaddr(net, pfx, dev, 1); 3774 if (ifa == NULL) { 3775 /* 3776 * It would be best to check for !NLM_F_CREATE here but 3777 * userspace alreay relies on not having to provide this. 3778 */ 3779 return inet6_addr_add(net, ifm->ifa_index, pfx, peer_pfx, 3780 ifm->ifa_prefixlen, ifa_flags, 3781 preferred_lft, valid_lft); 3782 } 3783 3784 if (nlh->nlmsg_flags & NLM_F_EXCL || 3785 !(nlh->nlmsg_flags & NLM_F_REPLACE)) 3786 err = -EEXIST; 3787 else 3788 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft); 3789 3790 in6_ifa_put(ifa); 3791 3792 return err; 3793 } 3794 3795 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags, 3796 u8 scope, int ifindex) 3797 { 3798 struct ifaddrmsg *ifm; 3799 3800 ifm = nlmsg_data(nlh); 3801 ifm->ifa_family = AF_INET6; 3802 ifm->ifa_prefixlen = prefixlen; 3803 ifm->ifa_flags = flags; 3804 ifm->ifa_scope = scope; 3805 ifm->ifa_index = ifindex; 3806 } 3807 3808 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp, 3809 unsigned long tstamp, u32 preferred, u32 valid) 3810 { 3811 struct ifa_cacheinfo ci; 3812 3813 ci.cstamp = cstamp_delta(cstamp); 3814 ci.tstamp = cstamp_delta(tstamp); 3815 ci.ifa_prefered = preferred; 3816 ci.ifa_valid = valid; 3817 3818 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci); 3819 } 3820 3821 static inline int rt_scope(int ifa_scope) 3822 { 3823 if (ifa_scope & IFA_HOST) 3824 return RT_SCOPE_HOST; 3825 else if (ifa_scope & IFA_LINK) 3826 return RT_SCOPE_LINK; 3827 else if (ifa_scope & IFA_SITE) 3828 return RT_SCOPE_SITE; 3829 else 3830 return RT_SCOPE_UNIVERSE; 3831 } 3832 3833 static inline int inet6_ifaddr_msgsize(void) 3834 { 3835 return NLMSG_ALIGN(sizeof(struct ifaddrmsg)) 3836 + nla_total_size(16) /* IFA_LOCAL */ 3837 + nla_total_size(16) /* IFA_ADDRESS */ 3838 + nla_total_size(sizeof(struct ifa_cacheinfo)); 3839 } 3840 3841 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa, 3842 u32 portid, u32 seq, int event, unsigned int flags) 3843 { 3844 struct nlmsghdr *nlh; 3845 u32 preferred, valid; 3846 3847 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags); 3848 if (nlh == NULL) 3849 return -EMSGSIZE; 3850 3851 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope), 3852 ifa->idev->dev->ifindex); 3853 3854 if (!(ifa->flags&IFA_F_PERMANENT)) { 3855 preferred = ifa->prefered_lft; 3856 valid = ifa->valid_lft; 3857 if (preferred != INFINITY_LIFE_TIME) { 3858 long tval = (jiffies - ifa->tstamp)/HZ; 3859 if (preferred > tval) 3860 preferred -= tval; 3861 else 3862 preferred = 0; 3863 if (valid != INFINITY_LIFE_TIME) { 3864 if (valid > tval) 3865 valid -= tval; 3866 else 3867 valid = 0; 3868 } 3869 } 3870 } else { 3871 preferred = INFINITY_LIFE_TIME; 3872 valid = INFINITY_LIFE_TIME; 3873 } 3874 3875 if (!ipv6_addr_any(&ifa->peer_addr)) { 3876 if (nla_put(skb, IFA_LOCAL, 16, &ifa->addr) < 0 || 3877 nla_put(skb, IFA_ADDRESS, 16, &ifa->peer_addr) < 0) 3878 goto error; 3879 } else 3880 if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0) 3881 goto error; 3882 3883 if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) 3884 goto error; 3885 3886 return nlmsg_end(skb, nlh); 3887 3888 error: 3889 nlmsg_cancel(skb, nlh); 3890 return -EMSGSIZE; 3891 } 3892 3893 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca, 3894 u32 portid, u32 seq, int event, u16 flags) 3895 { 3896 struct nlmsghdr *nlh; 3897 u8 scope = RT_SCOPE_UNIVERSE; 3898 int ifindex = ifmca->idev->dev->ifindex; 3899 3900 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE) 3901 scope = RT_SCOPE_SITE; 3902 3903 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags); 3904 if (nlh == NULL) 3905 return -EMSGSIZE; 3906 3907 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 3908 if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 || 3909 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp, 3910 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 3911 nlmsg_cancel(skb, nlh); 3912 return -EMSGSIZE; 3913 } 3914 3915 return nlmsg_end(skb, nlh); 3916 } 3917 3918 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca, 3919 u32 portid, u32 seq, int event, unsigned int flags) 3920 { 3921 struct nlmsghdr *nlh; 3922 u8 scope = RT_SCOPE_UNIVERSE; 3923 int ifindex = ifaca->aca_idev->dev->ifindex; 3924 3925 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE) 3926 scope = RT_SCOPE_SITE; 3927 3928 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags); 3929 if (nlh == NULL) 3930 return -EMSGSIZE; 3931 3932 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 3933 if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 || 3934 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp, 3935 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 3936 nlmsg_cancel(skb, nlh); 3937 return -EMSGSIZE; 3938 } 3939 3940 return nlmsg_end(skb, nlh); 3941 } 3942 3943 enum addr_type_t { 3944 UNICAST_ADDR, 3945 MULTICAST_ADDR, 3946 ANYCAST_ADDR, 3947 }; 3948 3949 /* called with rcu_read_lock() */ 3950 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb, 3951 struct netlink_callback *cb, enum addr_type_t type, 3952 int s_ip_idx, int *p_ip_idx) 3953 { 3954 struct ifmcaddr6 *ifmca; 3955 struct ifacaddr6 *ifaca; 3956 int err = 1; 3957 int ip_idx = *p_ip_idx; 3958 3959 read_lock_bh(&idev->lock); 3960 switch (type) { 3961 case UNICAST_ADDR: { 3962 struct inet6_ifaddr *ifa; 3963 3964 /* unicast address incl. temp addr */ 3965 list_for_each_entry(ifa, &idev->addr_list, if_list) { 3966 if (++ip_idx < s_ip_idx) 3967 continue; 3968 err = inet6_fill_ifaddr(skb, ifa, 3969 NETLINK_CB(cb->skb).portid, 3970 cb->nlh->nlmsg_seq, 3971 RTM_NEWADDR, 3972 NLM_F_MULTI); 3973 if (err <= 0) 3974 break; 3975 nl_dump_check_consistent(cb, nlmsg_hdr(skb)); 3976 } 3977 break; 3978 } 3979 case MULTICAST_ADDR: 3980 /* multicast address */ 3981 for (ifmca = idev->mc_list; ifmca; 3982 ifmca = ifmca->next, ip_idx++) { 3983 if (ip_idx < s_ip_idx) 3984 continue; 3985 err = inet6_fill_ifmcaddr(skb, ifmca, 3986 NETLINK_CB(cb->skb).portid, 3987 cb->nlh->nlmsg_seq, 3988 RTM_GETMULTICAST, 3989 NLM_F_MULTI); 3990 if (err <= 0) 3991 break; 3992 } 3993 break; 3994 case ANYCAST_ADDR: 3995 /* anycast address */ 3996 for (ifaca = idev->ac_list; ifaca; 3997 ifaca = ifaca->aca_next, ip_idx++) { 3998 if (ip_idx < s_ip_idx) 3999 continue; 4000 err = inet6_fill_ifacaddr(skb, ifaca, 4001 NETLINK_CB(cb->skb).portid, 4002 cb->nlh->nlmsg_seq, 4003 RTM_GETANYCAST, 4004 NLM_F_MULTI); 4005 if (err <= 0) 4006 break; 4007 } 4008 break; 4009 default: 4010 break; 4011 } 4012 read_unlock_bh(&idev->lock); 4013 *p_ip_idx = ip_idx; 4014 return err; 4015 } 4016 4017 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb, 4018 enum addr_type_t type) 4019 { 4020 struct net *net = sock_net(skb->sk); 4021 int h, s_h; 4022 int idx, ip_idx; 4023 int s_idx, s_ip_idx; 4024 struct net_device *dev; 4025 struct inet6_dev *idev; 4026 struct hlist_head *head; 4027 4028 s_h = cb->args[0]; 4029 s_idx = idx = cb->args[1]; 4030 s_ip_idx = ip_idx = cb->args[2]; 4031 4032 rcu_read_lock(); 4033 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ net->dev_base_seq; 4034 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 4035 idx = 0; 4036 head = &net->dev_index_head[h]; 4037 hlist_for_each_entry_rcu(dev, head, index_hlist) { 4038 if (idx < s_idx) 4039 goto cont; 4040 if (h > s_h || idx > s_idx) 4041 s_ip_idx = 0; 4042 ip_idx = 0; 4043 idev = __in6_dev_get(dev); 4044 if (!idev) 4045 goto cont; 4046 4047 if (in6_dump_addrs(idev, skb, cb, type, 4048 s_ip_idx, &ip_idx) <= 0) 4049 goto done; 4050 cont: 4051 idx++; 4052 } 4053 } 4054 done: 4055 rcu_read_unlock(); 4056 cb->args[0] = h; 4057 cb->args[1] = idx; 4058 cb->args[2] = ip_idx; 4059 4060 return skb->len; 4061 } 4062 4063 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb) 4064 { 4065 enum addr_type_t type = UNICAST_ADDR; 4066 4067 return inet6_dump_addr(skb, cb, type); 4068 } 4069 4070 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb) 4071 { 4072 enum addr_type_t type = MULTICAST_ADDR; 4073 4074 return inet6_dump_addr(skb, cb, type); 4075 } 4076 4077 4078 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb) 4079 { 4080 enum addr_type_t type = ANYCAST_ADDR; 4081 4082 return inet6_dump_addr(skb, cb, type); 4083 } 4084 4085 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh) 4086 { 4087 struct net *net = sock_net(in_skb->sk); 4088 struct ifaddrmsg *ifm; 4089 struct nlattr *tb[IFA_MAX+1]; 4090 struct in6_addr *addr = NULL, *peer; 4091 struct net_device *dev = NULL; 4092 struct inet6_ifaddr *ifa; 4093 struct sk_buff *skb; 4094 int err; 4095 4096 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy); 4097 if (err < 0) 4098 goto errout; 4099 4100 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer); 4101 if (addr == NULL) { 4102 err = -EINVAL; 4103 goto errout; 4104 } 4105 4106 ifm = nlmsg_data(nlh); 4107 if (ifm->ifa_index) 4108 dev = __dev_get_by_index(net, ifm->ifa_index); 4109 4110 ifa = ipv6_get_ifaddr(net, addr, dev, 1); 4111 if (!ifa) { 4112 err = -EADDRNOTAVAIL; 4113 goto errout; 4114 } 4115 4116 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL); 4117 if (!skb) { 4118 err = -ENOBUFS; 4119 goto errout_ifa; 4120 } 4121 4122 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).portid, 4123 nlh->nlmsg_seq, RTM_NEWADDR, 0); 4124 if (err < 0) { 4125 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 4126 WARN_ON(err == -EMSGSIZE); 4127 kfree_skb(skb); 4128 goto errout_ifa; 4129 } 4130 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid); 4131 errout_ifa: 4132 in6_ifa_put(ifa); 4133 errout: 4134 return err; 4135 } 4136 4137 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa) 4138 { 4139 struct sk_buff *skb; 4140 struct net *net = dev_net(ifa->idev->dev); 4141 int err = -ENOBUFS; 4142 4143 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC); 4144 if (skb == NULL) 4145 goto errout; 4146 4147 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0); 4148 if (err < 0) { 4149 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 4150 WARN_ON(err == -EMSGSIZE); 4151 kfree_skb(skb); 4152 goto errout; 4153 } 4154 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC); 4155 return; 4156 errout: 4157 if (err < 0) 4158 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err); 4159 } 4160 4161 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf, 4162 __s32 *array, int bytes) 4163 { 4164 BUG_ON(bytes < (DEVCONF_MAX * 4)); 4165 4166 memset(array, 0, bytes); 4167 array[DEVCONF_FORWARDING] = cnf->forwarding; 4168 array[DEVCONF_HOPLIMIT] = cnf->hop_limit; 4169 array[DEVCONF_MTU6] = cnf->mtu6; 4170 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra; 4171 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects; 4172 array[DEVCONF_AUTOCONF] = cnf->autoconf; 4173 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits; 4174 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits; 4175 array[DEVCONF_RTR_SOLICIT_INTERVAL] = 4176 jiffies_to_msecs(cnf->rtr_solicit_interval); 4177 array[DEVCONF_RTR_SOLICIT_DELAY] = 4178 jiffies_to_msecs(cnf->rtr_solicit_delay); 4179 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version; 4180 #ifdef CONFIG_IPV6_PRIVACY 4181 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr; 4182 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft; 4183 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft; 4184 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry; 4185 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor; 4186 #endif 4187 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses; 4188 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr; 4189 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo; 4190 #ifdef CONFIG_IPV6_ROUTER_PREF 4191 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref; 4192 array[DEVCONF_RTR_PROBE_INTERVAL] = 4193 jiffies_to_msecs(cnf->rtr_probe_interval); 4194 #ifdef CONFIG_IPV6_ROUTE_INFO 4195 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen; 4196 #endif 4197 #endif 4198 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp; 4199 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route; 4200 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 4201 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad; 4202 #endif 4203 #ifdef CONFIG_IPV6_MROUTE 4204 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding; 4205 #endif 4206 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6; 4207 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad; 4208 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao; 4209 array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify; 4210 } 4211 4212 static inline size_t inet6_ifla6_size(void) 4213 { 4214 return nla_total_size(4) /* IFLA_INET6_FLAGS */ 4215 + nla_total_size(sizeof(struct ifla_cacheinfo)) 4216 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */ 4217 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */ 4218 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */ 4219 + nla_total_size(sizeof(struct in6_addr)); /* IFLA_INET6_TOKEN */ 4220 } 4221 4222 static inline size_t inet6_if_nlmsg_size(void) 4223 { 4224 return NLMSG_ALIGN(sizeof(struct ifinfomsg)) 4225 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */ 4226 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */ 4227 + nla_total_size(4) /* IFLA_MTU */ 4228 + nla_total_size(4) /* IFLA_LINK */ 4229 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */ 4230 } 4231 4232 static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib, 4233 int items, int bytes) 4234 { 4235 int i; 4236 int pad = bytes - sizeof(u64) * items; 4237 BUG_ON(pad < 0); 4238 4239 /* Use put_unaligned() because stats may not be aligned for u64. */ 4240 put_unaligned(items, &stats[0]); 4241 for (i = 1; i < items; i++) 4242 put_unaligned(atomic_long_read(&mib[i]), &stats[i]); 4243 4244 memset(&stats[items], 0, pad); 4245 } 4246 4247 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu **mib, 4248 int items, int bytes, size_t syncpoff) 4249 { 4250 int i; 4251 int pad = bytes - sizeof(u64) * items; 4252 BUG_ON(pad < 0); 4253 4254 /* Use put_unaligned() because stats may not be aligned for u64. */ 4255 put_unaligned(items, &stats[0]); 4256 for (i = 1; i < items; i++) 4257 put_unaligned(snmp_fold_field64(mib, i, syncpoff), &stats[i]); 4258 4259 memset(&stats[items], 0, pad); 4260 } 4261 4262 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype, 4263 int bytes) 4264 { 4265 switch (attrtype) { 4266 case IFLA_INET6_STATS: 4267 __snmp6_fill_stats64(stats, (void __percpu **)idev->stats.ipv6, 4268 IPSTATS_MIB_MAX, bytes, offsetof(struct ipstats_mib, syncp)); 4269 break; 4270 case IFLA_INET6_ICMP6STATS: 4271 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, ICMP6_MIB_MAX, bytes); 4272 break; 4273 } 4274 } 4275 4276 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev) 4277 { 4278 struct nlattr *nla; 4279 struct ifla_cacheinfo ci; 4280 4281 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags)) 4282 goto nla_put_failure; 4283 ci.max_reasm_len = IPV6_MAXPLEN; 4284 ci.tstamp = cstamp_delta(idev->tstamp); 4285 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time); 4286 ci.retrans_time = jiffies_to_msecs(idev->nd_parms->retrans_time); 4287 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci)) 4288 goto nla_put_failure; 4289 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32)); 4290 if (nla == NULL) 4291 goto nla_put_failure; 4292 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla)); 4293 4294 /* XXX - MC not implemented */ 4295 4296 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64)); 4297 if (nla == NULL) 4298 goto nla_put_failure; 4299 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla)); 4300 4301 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64)); 4302 if (nla == NULL) 4303 goto nla_put_failure; 4304 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla)); 4305 4306 nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr)); 4307 if (nla == NULL) 4308 goto nla_put_failure; 4309 read_lock_bh(&idev->lock); 4310 memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla)); 4311 read_unlock_bh(&idev->lock); 4312 4313 return 0; 4314 4315 nla_put_failure: 4316 return -EMSGSIZE; 4317 } 4318 4319 static size_t inet6_get_link_af_size(const struct net_device *dev) 4320 { 4321 if (!__in6_dev_get(dev)) 4322 return 0; 4323 4324 return inet6_ifla6_size(); 4325 } 4326 4327 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev) 4328 { 4329 struct inet6_dev *idev = __in6_dev_get(dev); 4330 4331 if (!idev) 4332 return -ENODATA; 4333 4334 if (inet6_fill_ifla6_attrs(skb, idev) < 0) 4335 return -EMSGSIZE; 4336 4337 return 0; 4338 } 4339 4340 static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token) 4341 { 4342 struct inet6_ifaddr *ifp; 4343 struct net_device *dev = idev->dev; 4344 bool update_rs = false; 4345 struct in6_addr ll_addr; 4346 4347 if (token == NULL) 4348 return -EINVAL; 4349 if (ipv6_addr_any(token)) 4350 return -EINVAL; 4351 if (dev->flags & (IFF_LOOPBACK | IFF_NOARP)) 4352 return -EINVAL; 4353 if (!ipv6_accept_ra(idev)) 4354 return -EINVAL; 4355 if (idev->cnf.rtr_solicits <= 0) 4356 return -EINVAL; 4357 4358 write_lock_bh(&idev->lock); 4359 4360 BUILD_BUG_ON(sizeof(token->s6_addr) != 16); 4361 memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8); 4362 4363 write_unlock_bh(&idev->lock); 4364 4365 if (!idev->dead && (idev->if_flags & IF_READY) && 4366 !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE | 4367 IFA_F_OPTIMISTIC)) { 4368 4369 /* If we're not ready, then normal ifup will take care 4370 * of this. Otherwise, we need to request our rs here. 4371 */ 4372 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters); 4373 update_rs = true; 4374 } 4375 4376 write_lock_bh(&idev->lock); 4377 4378 if (update_rs) { 4379 idev->if_flags |= IF_RS_SENT; 4380 idev->rs_probes = 1; 4381 addrconf_mod_rs_timer(idev, idev->cnf.rtr_solicit_interval); 4382 } 4383 4384 /* Well, that's kinda nasty ... */ 4385 list_for_each_entry(ifp, &idev->addr_list, if_list) { 4386 spin_lock(&ifp->lock); 4387 if (ifp->tokenized) { 4388 ifp->valid_lft = 0; 4389 ifp->prefered_lft = 0; 4390 } 4391 spin_unlock(&ifp->lock); 4392 } 4393 4394 write_unlock_bh(&idev->lock); 4395 addrconf_verify(0); 4396 return 0; 4397 } 4398 4399 static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla) 4400 { 4401 int err = -EINVAL; 4402 struct inet6_dev *idev = __in6_dev_get(dev); 4403 struct nlattr *tb[IFLA_INET6_MAX + 1]; 4404 4405 if (!idev) 4406 return -EAFNOSUPPORT; 4407 4408 if (nla_parse_nested(tb, IFLA_INET6_MAX, nla, NULL) < 0) 4409 BUG(); 4410 4411 if (tb[IFLA_INET6_TOKEN]) 4412 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN])); 4413 4414 return err; 4415 } 4416 4417 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev, 4418 u32 portid, u32 seq, int event, unsigned int flags) 4419 { 4420 struct net_device *dev = idev->dev; 4421 struct ifinfomsg *hdr; 4422 struct nlmsghdr *nlh; 4423 void *protoinfo; 4424 4425 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags); 4426 if (nlh == NULL) 4427 return -EMSGSIZE; 4428 4429 hdr = nlmsg_data(nlh); 4430 hdr->ifi_family = AF_INET6; 4431 hdr->__ifi_pad = 0; 4432 hdr->ifi_type = dev->type; 4433 hdr->ifi_index = dev->ifindex; 4434 hdr->ifi_flags = dev_get_flags(dev); 4435 hdr->ifi_change = 0; 4436 4437 if (nla_put_string(skb, IFLA_IFNAME, dev->name) || 4438 (dev->addr_len && 4439 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) || 4440 nla_put_u32(skb, IFLA_MTU, dev->mtu) || 4441 (dev->ifindex != dev->iflink && 4442 nla_put_u32(skb, IFLA_LINK, dev->iflink))) 4443 goto nla_put_failure; 4444 protoinfo = nla_nest_start(skb, IFLA_PROTINFO); 4445 if (protoinfo == NULL) 4446 goto nla_put_failure; 4447 4448 if (inet6_fill_ifla6_attrs(skb, idev) < 0) 4449 goto nla_put_failure; 4450 4451 nla_nest_end(skb, protoinfo); 4452 return nlmsg_end(skb, nlh); 4453 4454 nla_put_failure: 4455 nlmsg_cancel(skb, nlh); 4456 return -EMSGSIZE; 4457 } 4458 4459 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb) 4460 { 4461 struct net *net = sock_net(skb->sk); 4462 int h, s_h; 4463 int idx = 0, s_idx; 4464 struct net_device *dev; 4465 struct inet6_dev *idev; 4466 struct hlist_head *head; 4467 4468 s_h = cb->args[0]; 4469 s_idx = cb->args[1]; 4470 4471 rcu_read_lock(); 4472 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 4473 idx = 0; 4474 head = &net->dev_index_head[h]; 4475 hlist_for_each_entry_rcu(dev, head, index_hlist) { 4476 if (idx < s_idx) 4477 goto cont; 4478 idev = __in6_dev_get(dev); 4479 if (!idev) 4480 goto cont; 4481 if (inet6_fill_ifinfo(skb, idev, 4482 NETLINK_CB(cb->skb).portid, 4483 cb->nlh->nlmsg_seq, 4484 RTM_NEWLINK, NLM_F_MULTI) <= 0) 4485 goto out; 4486 cont: 4487 idx++; 4488 } 4489 } 4490 out: 4491 rcu_read_unlock(); 4492 cb->args[1] = idx; 4493 cb->args[0] = h; 4494 4495 return skb->len; 4496 } 4497 4498 void inet6_ifinfo_notify(int event, struct inet6_dev *idev) 4499 { 4500 struct sk_buff *skb; 4501 struct net *net = dev_net(idev->dev); 4502 int err = -ENOBUFS; 4503 4504 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC); 4505 if (skb == NULL) 4506 goto errout; 4507 4508 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0); 4509 if (err < 0) { 4510 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */ 4511 WARN_ON(err == -EMSGSIZE); 4512 kfree_skb(skb); 4513 goto errout; 4514 } 4515 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC); 4516 return; 4517 errout: 4518 if (err < 0) 4519 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err); 4520 } 4521 4522 static inline size_t inet6_prefix_nlmsg_size(void) 4523 { 4524 return NLMSG_ALIGN(sizeof(struct prefixmsg)) 4525 + nla_total_size(sizeof(struct in6_addr)) 4526 + nla_total_size(sizeof(struct prefix_cacheinfo)); 4527 } 4528 4529 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev, 4530 struct prefix_info *pinfo, u32 portid, u32 seq, 4531 int event, unsigned int flags) 4532 { 4533 struct prefixmsg *pmsg; 4534 struct nlmsghdr *nlh; 4535 struct prefix_cacheinfo ci; 4536 4537 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags); 4538 if (nlh == NULL) 4539 return -EMSGSIZE; 4540 4541 pmsg = nlmsg_data(nlh); 4542 pmsg->prefix_family = AF_INET6; 4543 pmsg->prefix_pad1 = 0; 4544 pmsg->prefix_pad2 = 0; 4545 pmsg->prefix_ifindex = idev->dev->ifindex; 4546 pmsg->prefix_len = pinfo->prefix_len; 4547 pmsg->prefix_type = pinfo->type; 4548 pmsg->prefix_pad3 = 0; 4549 pmsg->prefix_flags = 0; 4550 if (pinfo->onlink) 4551 pmsg->prefix_flags |= IF_PREFIX_ONLINK; 4552 if (pinfo->autoconf) 4553 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF; 4554 4555 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix)) 4556 goto nla_put_failure; 4557 ci.preferred_time = ntohl(pinfo->prefered); 4558 ci.valid_time = ntohl(pinfo->valid); 4559 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci)) 4560 goto nla_put_failure; 4561 return nlmsg_end(skb, nlh); 4562 4563 nla_put_failure: 4564 nlmsg_cancel(skb, nlh); 4565 return -EMSGSIZE; 4566 } 4567 4568 static void inet6_prefix_notify(int event, struct inet6_dev *idev, 4569 struct prefix_info *pinfo) 4570 { 4571 struct sk_buff *skb; 4572 struct net *net = dev_net(idev->dev); 4573 int err = -ENOBUFS; 4574 4575 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC); 4576 if (skb == NULL) 4577 goto errout; 4578 4579 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0); 4580 if (err < 0) { 4581 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */ 4582 WARN_ON(err == -EMSGSIZE); 4583 kfree_skb(skb); 4584 goto errout; 4585 } 4586 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC); 4587 return; 4588 errout: 4589 if (err < 0) 4590 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err); 4591 } 4592 4593 static void update_valid_ll_addr_cnt(struct inet6_ifaddr *ifp, int count) 4594 { 4595 write_lock_bh(&ifp->idev->lock); 4596 spin_lock(&ifp->lock); 4597 if (((ifp->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE|IFA_F_OPTIMISTIC| 4598 IFA_F_DADFAILED)) == IFA_F_PERMANENT) && 4599 (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) 4600 ifp->idev->valid_ll_addr_cnt += count; 4601 WARN_ON(ifp->idev->valid_ll_addr_cnt < 0); 4602 spin_unlock(&ifp->lock); 4603 write_unlock_bh(&ifp->idev->lock); 4604 } 4605 4606 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 4607 { 4608 struct net *net = dev_net(ifp->idev->dev); 4609 4610 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp); 4611 4612 switch (event) { 4613 case RTM_NEWADDR: 4614 update_valid_ll_addr_cnt(ifp, 1); 4615 4616 /* 4617 * If the address was optimistic 4618 * we inserted the route at the start of 4619 * our DAD process, so we don't need 4620 * to do it again 4621 */ 4622 if (!(ifp->rt->rt6i_node)) 4623 ip6_ins_rt(ifp->rt); 4624 if (ifp->idev->cnf.forwarding) 4625 addrconf_join_anycast(ifp); 4626 if (!ipv6_addr_any(&ifp->peer_addr)) 4627 addrconf_prefix_route(&ifp->peer_addr, 128, 4628 ifp->idev->dev, 0, 0); 4629 break; 4630 case RTM_DELADDR: 4631 update_valid_ll_addr_cnt(ifp, -1); 4632 4633 if (ifp->idev->cnf.forwarding) 4634 addrconf_leave_anycast(ifp); 4635 addrconf_leave_solict(ifp->idev, &ifp->addr); 4636 if (!ipv6_addr_any(&ifp->peer_addr)) { 4637 struct rt6_info *rt; 4638 struct net_device *dev = ifp->idev->dev; 4639 4640 rt = rt6_lookup(dev_net(dev), &ifp->peer_addr, NULL, 4641 dev->ifindex, 1); 4642 if (rt) { 4643 dst_hold(&rt->dst); 4644 if (ip6_del_rt(rt)) 4645 dst_free(&rt->dst); 4646 } 4647 } 4648 dst_hold(&ifp->rt->dst); 4649 4650 if (ip6_del_rt(ifp->rt)) 4651 dst_free(&ifp->rt->dst); 4652 break; 4653 } 4654 atomic_inc(&net->ipv6.dev_addr_genid); 4655 } 4656 4657 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 4658 { 4659 rcu_read_lock_bh(); 4660 if (likely(ifp->idev->dead == 0)) 4661 __ipv6_ifa_notify(event, ifp); 4662 rcu_read_unlock_bh(); 4663 } 4664 4665 #ifdef CONFIG_SYSCTL 4666 4667 static 4668 int addrconf_sysctl_forward(struct ctl_table *ctl, int write, 4669 void __user *buffer, size_t *lenp, loff_t *ppos) 4670 { 4671 int *valp = ctl->data; 4672 int val = *valp; 4673 loff_t pos = *ppos; 4674 struct ctl_table lctl; 4675 int ret; 4676 4677 /* 4678 * ctl->data points to idev->cnf.forwarding, we should 4679 * not modify it until we get the rtnl lock. 4680 */ 4681 lctl = *ctl; 4682 lctl.data = &val; 4683 4684 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 4685 4686 if (write) 4687 ret = addrconf_fixup_forwarding(ctl, valp, val); 4688 if (ret) 4689 *ppos = pos; 4690 return ret; 4691 } 4692 4693 static void dev_disable_change(struct inet6_dev *idev) 4694 { 4695 struct netdev_notifier_info info; 4696 4697 if (!idev || !idev->dev) 4698 return; 4699 4700 netdev_notifier_info_init(&info, idev->dev); 4701 if (idev->cnf.disable_ipv6) 4702 addrconf_notify(NULL, NETDEV_DOWN, &info); 4703 else 4704 addrconf_notify(NULL, NETDEV_UP, &info); 4705 } 4706 4707 static void addrconf_disable_change(struct net *net, __s32 newf) 4708 { 4709 struct net_device *dev; 4710 struct inet6_dev *idev; 4711 4712 rcu_read_lock(); 4713 for_each_netdev_rcu(net, dev) { 4714 idev = __in6_dev_get(dev); 4715 if (idev) { 4716 int changed = (!idev->cnf.disable_ipv6) ^ (!newf); 4717 idev->cnf.disable_ipv6 = newf; 4718 if (changed) 4719 dev_disable_change(idev); 4720 } 4721 } 4722 rcu_read_unlock(); 4723 } 4724 4725 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf) 4726 { 4727 struct net *net; 4728 int old; 4729 4730 if (!rtnl_trylock()) 4731 return restart_syscall(); 4732 4733 net = (struct net *)table->extra2; 4734 old = *p; 4735 *p = newf; 4736 4737 if (p == &net->ipv6.devconf_dflt->disable_ipv6) { 4738 rtnl_unlock(); 4739 return 0; 4740 } 4741 4742 if (p == &net->ipv6.devconf_all->disable_ipv6) { 4743 net->ipv6.devconf_dflt->disable_ipv6 = newf; 4744 addrconf_disable_change(net, newf); 4745 } else if ((!newf) ^ (!old)) 4746 dev_disable_change((struct inet6_dev *)table->extra1); 4747 4748 rtnl_unlock(); 4749 return 0; 4750 } 4751 4752 static 4753 int addrconf_sysctl_disable(struct ctl_table *ctl, int write, 4754 void __user *buffer, size_t *lenp, loff_t *ppos) 4755 { 4756 int *valp = ctl->data; 4757 int val = *valp; 4758 loff_t pos = *ppos; 4759 struct ctl_table lctl; 4760 int ret; 4761 4762 /* 4763 * ctl->data points to idev->cnf.disable_ipv6, we should 4764 * not modify it until we get the rtnl lock. 4765 */ 4766 lctl = *ctl; 4767 lctl.data = &val; 4768 4769 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 4770 4771 if (write) 4772 ret = addrconf_disable_ipv6(ctl, valp, val); 4773 if (ret) 4774 *ppos = pos; 4775 return ret; 4776 } 4777 4778 static struct addrconf_sysctl_table 4779 { 4780 struct ctl_table_header *sysctl_header; 4781 struct ctl_table addrconf_vars[DEVCONF_MAX+1]; 4782 } addrconf_sysctl __read_mostly = { 4783 .sysctl_header = NULL, 4784 .addrconf_vars = { 4785 { 4786 .procname = "forwarding", 4787 .data = &ipv6_devconf.forwarding, 4788 .maxlen = sizeof(int), 4789 .mode = 0644, 4790 .proc_handler = addrconf_sysctl_forward, 4791 }, 4792 { 4793 .procname = "hop_limit", 4794 .data = &ipv6_devconf.hop_limit, 4795 .maxlen = sizeof(int), 4796 .mode = 0644, 4797 .proc_handler = proc_dointvec, 4798 }, 4799 { 4800 .procname = "mtu", 4801 .data = &ipv6_devconf.mtu6, 4802 .maxlen = sizeof(int), 4803 .mode = 0644, 4804 .proc_handler = proc_dointvec, 4805 }, 4806 { 4807 .procname = "accept_ra", 4808 .data = &ipv6_devconf.accept_ra, 4809 .maxlen = sizeof(int), 4810 .mode = 0644, 4811 .proc_handler = proc_dointvec, 4812 }, 4813 { 4814 .procname = "accept_redirects", 4815 .data = &ipv6_devconf.accept_redirects, 4816 .maxlen = sizeof(int), 4817 .mode = 0644, 4818 .proc_handler = proc_dointvec, 4819 }, 4820 { 4821 .procname = "autoconf", 4822 .data = &ipv6_devconf.autoconf, 4823 .maxlen = sizeof(int), 4824 .mode = 0644, 4825 .proc_handler = proc_dointvec, 4826 }, 4827 { 4828 .procname = "dad_transmits", 4829 .data = &ipv6_devconf.dad_transmits, 4830 .maxlen = sizeof(int), 4831 .mode = 0644, 4832 .proc_handler = proc_dointvec, 4833 }, 4834 { 4835 .procname = "router_solicitations", 4836 .data = &ipv6_devconf.rtr_solicits, 4837 .maxlen = sizeof(int), 4838 .mode = 0644, 4839 .proc_handler = proc_dointvec, 4840 }, 4841 { 4842 .procname = "router_solicitation_interval", 4843 .data = &ipv6_devconf.rtr_solicit_interval, 4844 .maxlen = sizeof(int), 4845 .mode = 0644, 4846 .proc_handler = proc_dointvec_jiffies, 4847 }, 4848 { 4849 .procname = "router_solicitation_delay", 4850 .data = &ipv6_devconf.rtr_solicit_delay, 4851 .maxlen = sizeof(int), 4852 .mode = 0644, 4853 .proc_handler = proc_dointvec_jiffies, 4854 }, 4855 { 4856 .procname = "force_mld_version", 4857 .data = &ipv6_devconf.force_mld_version, 4858 .maxlen = sizeof(int), 4859 .mode = 0644, 4860 .proc_handler = proc_dointvec, 4861 }, 4862 #ifdef CONFIG_IPV6_PRIVACY 4863 { 4864 .procname = "use_tempaddr", 4865 .data = &ipv6_devconf.use_tempaddr, 4866 .maxlen = sizeof(int), 4867 .mode = 0644, 4868 .proc_handler = proc_dointvec, 4869 }, 4870 { 4871 .procname = "temp_valid_lft", 4872 .data = &ipv6_devconf.temp_valid_lft, 4873 .maxlen = sizeof(int), 4874 .mode = 0644, 4875 .proc_handler = proc_dointvec, 4876 }, 4877 { 4878 .procname = "temp_prefered_lft", 4879 .data = &ipv6_devconf.temp_prefered_lft, 4880 .maxlen = sizeof(int), 4881 .mode = 0644, 4882 .proc_handler = proc_dointvec, 4883 }, 4884 { 4885 .procname = "regen_max_retry", 4886 .data = &ipv6_devconf.regen_max_retry, 4887 .maxlen = sizeof(int), 4888 .mode = 0644, 4889 .proc_handler = proc_dointvec, 4890 }, 4891 { 4892 .procname = "max_desync_factor", 4893 .data = &ipv6_devconf.max_desync_factor, 4894 .maxlen = sizeof(int), 4895 .mode = 0644, 4896 .proc_handler = proc_dointvec, 4897 }, 4898 #endif 4899 { 4900 .procname = "max_addresses", 4901 .data = &ipv6_devconf.max_addresses, 4902 .maxlen = sizeof(int), 4903 .mode = 0644, 4904 .proc_handler = proc_dointvec, 4905 }, 4906 { 4907 .procname = "accept_ra_defrtr", 4908 .data = &ipv6_devconf.accept_ra_defrtr, 4909 .maxlen = sizeof(int), 4910 .mode = 0644, 4911 .proc_handler = proc_dointvec, 4912 }, 4913 { 4914 .procname = "accept_ra_pinfo", 4915 .data = &ipv6_devconf.accept_ra_pinfo, 4916 .maxlen = sizeof(int), 4917 .mode = 0644, 4918 .proc_handler = proc_dointvec, 4919 }, 4920 #ifdef CONFIG_IPV6_ROUTER_PREF 4921 { 4922 .procname = "accept_ra_rtr_pref", 4923 .data = &ipv6_devconf.accept_ra_rtr_pref, 4924 .maxlen = sizeof(int), 4925 .mode = 0644, 4926 .proc_handler = proc_dointvec, 4927 }, 4928 { 4929 .procname = "router_probe_interval", 4930 .data = &ipv6_devconf.rtr_probe_interval, 4931 .maxlen = sizeof(int), 4932 .mode = 0644, 4933 .proc_handler = proc_dointvec_jiffies, 4934 }, 4935 #ifdef CONFIG_IPV6_ROUTE_INFO 4936 { 4937 .procname = "accept_ra_rt_info_max_plen", 4938 .data = &ipv6_devconf.accept_ra_rt_info_max_plen, 4939 .maxlen = sizeof(int), 4940 .mode = 0644, 4941 .proc_handler = proc_dointvec, 4942 }, 4943 #endif 4944 #endif 4945 { 4946 .procname = "proxy_ndp", 4947 .data = &ipv6_devconf.proxy_ndp, 4948 .maxlen = sizeof(int), 4949 .mode = 0644, 4950 .proc_handler = proc_dointvec, 4951 }, 4952 { 4953 .procname = "accept_source_route", 4954 .data = &ipv6_devconf.accept_source_route, 4955 .maxlen = sizeof(int), 4956 .mode = 0644, 4957 .proc_handler = proc_dointvec, 4958 }, 4959 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 4960 { 4961 .procname = "optimistic_dad", 4962 .data = &ipv6_devconf.optimistic_dad, 4963 .maxlen = sizeof(int), 4964 .mode = 0644, 4965 .proc_handler = proc_dointvec, 4966 4967 }, 4968 #endif 4969 #ifdef CONFIG_IPV6_MROUTE 4970 { 4971 .procname = "mc_forwarding", 4972 .data = &ipv6_devconf.mc_forwarding, 4973 .maxlen = sizeof(int), 4974 .mode = 0444, 4975 .proc_handler = proc_dointvec, 4976 }, 4977 #endif 4978 { 4979 .procname = "disable_ipv6", 4980 .data = &ipv6_devconf.disable_ipv6, 4981 .maxlen = sizeof(int), 4982 .mode = 0644, 4983 .proc_handler = addrconf_sysctl_disable, 4984 }, 4985 { 4986 .procname = "accept_dad", 4987 .data = &ipv6_devconf.accept_dad, 4988 .maxlen = sizeof(int), 4989 .mode = 0644, 4990 .proc_handler = proc_dointvec, 4991 }, 4992 { 4993 .procname = "force_tllao", 4994 .data = &ipv6_devconf.force_tllao, 4995 .maxlen = sizeof(int), 4996 .mode = 0644, 4997 .proc_handler = proc_dointvec 4998 }, 4999 { 5000 .procname = "ndisc_notify", 5001 .data = &ipv6_devconf.ndisc_notify, 5002 .maxlen = sizeof(int), 5003 .mode = 0644, 5004 .proc_handler = proc_dointvec 5005 }, 5006 { 5007 /* sentinel */ 5008 } 5009 }, 5010 }; 5011 5012 static int __addrconf_sysctl_register(struct net *net, char *dev_name, 5013 struct inet6_dev *idev, struct ipv6_devconf *p) 5014 { 5015 int i; 5016 struct addrconf_sysctl_table *t; 5017 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ]; 5018 5019 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL); 5020 if (t == NULL) 5021 goto out; 5022 5023 for (i = 0; t->addrconf_vars[i].data; i++) { 5024 t->addrconf_vars[i].data += (char *)p - (char *)&ipv6_devconf; 5025 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */ 5026 t->addrconf_vars[i].extra2 = net; 5027 } 5028 5029 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name); 5030 5031 t->sysctl_header = register_net_sysctl(net, path, t->addrconf_vars); 5032 if (t->sysctl_header == NULL) 5033 goto free; 5034 5035 p->sysctl = t; 5036 return 0; 5037 5038 free: 5039 kfree(t); 5040 out: 5041 return -ENOBUFS; 5042 } 5043 5044 static void __addrconf_sysctl_unregister(struct ipv6_devconf *p) 5045 { 5046 struct addrconf_sysctl_table *t; 5047 5048 if (p->sysctl == NULL) 5049 return; 5050 5051 t = p->sysctl; 5052 p->sysctl = NULL; 5053 unregister_net_sysctl_table(t->sysctl_header); 5054 kfree(t); 5055 } 5056 5057 static void addrconf_sysctl_register(struct inet6_dev *idev) 5058 { 5059 neigh_sysctl_register(idev->dev, idev->nd_parms, "ipv6", 5060 &ndisc_ifinfo_sysctl_change); 5061 __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name, 5062 idev, &idev->cnf); 5063 } 5064 5065 static void addrconf_sysctl_unregister(struct inet6_dev *idev) 5066 { 5067 __addrconf_sysctl_unregister(&idev->cnf); 5068 neigh_sysctl_unregister(idev->nd_parms); 5069 } 5070 5071 5072 #endif 5073 5074 static int __net_init addrconf_init_net(struct net *net) 5075 { 5076 int err = -ENOMEM; 5077 struct ipv6_devconf *all, *dflt; 5078 5079 all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL); 5080 if (all == NULL) 5081 goto err_alloc_all; 5082 5083 dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL); 5084 if (dflt == NULL) 5085 goto err_alloc_dflt; 5086 5087 /* these will be inherited by all namespaces */ 5088 dflt->autoconf = ipv6_defaults.autoconf; 5089 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6; 5090 5091 net->ipv6.devconf_all = all; 5092 net->ipv6.devconf_dflt = dflt; 5093 5094 #ifdef CONFIG_SYSCTL 5095 err = __addrconf_sysctl_register(net, "all", NULL, all); 5096 if (err < 0) 5097 goto err_reg_all; 5098 5099 err = __addrconf_sysctl_register(net, "default", NULL, dflt); 5100 if (err < 0) 5101 goto err_reg_dflt; 5102 #endif 5103 return 0; 5104 5105 #ifdef CONFIG_SYSCTL 5106 err_reg_dflt: 5107 __addrconf_sysctl_unregister(all); 5108 err_reg_all: 5109 kfree(dflt); 5110 #endif 5111 err_alloc_dflt: 5112 kfree(all); 5113 err_alloc_all: 5114 return err; 5115 } 5116 5117 static void __net_exit addrconf_exit_net(struct net *net) 5118 { 5119 #ifdef CONFIG_SYSCTL 5120 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt); 5121 __addrconf_sysctl_unregister(net->ipv6.devconf_all); 5122 #endif 5123 if (!net_eq(net, &init_net)) { 5124 kfree(net->ipv6.devconf_dflt); 5125 kfree(net->ipv6.devconf_all); 5126 } 5127 } 5128 5129 static struct pernet_operations addrconf_ops = { 5130 .init = addrconf_init_net, 5131 .exit = addrconf_exit_net, 5132 }; 5133 5134 static struct rtnl_af_ops inet6_ops = { 5135 .family = AF_INET6, 5136 .fill_link_af = inet6_fill_link_af, 5137 .get_link_af_size = inet6_get_link_af_size, 5138 .set_link_af = inet6_set_link_af, 5139 }; 5140 5141 /* 5142 * Init / cleanup code 5143 */ 5144 5145 int __init addrconf_init(void) 5146 { 5147 int i, err; 5148 5149 err = ipv6_addr_label_init(); 5150 if (err < 0) { 5151 pr_crit("%s: cannot initialize default policy table: %d\n", 5152 __func__, err); 5153 goto out; 5154 } 5155 5156 err = register_pernet_subsys(&addrconf_ops); 5157 if (err < 0) 5158 goto out_addrlabel; 5159 5160 /* The addrconf netdev notifier requires that loopback_dev 5161 * has it's ipv6 private information allocated and setup 5162 * before it can bring up and give link-local addresses 5163 * to other devices which are up. 5164 * 5165 * Unfortunately, loopback_dev is not necessarily the first 5166 * entry in the global dev_base list of net devices. In fact, 5167 * it is likely to be the very last entry on that list. 5168 * So this causes the notifier registry below to try and 5169 * give link-local addresses to all devices besides loopback_dev 5170 * first, then loopback_dev, which cases all the non-loopback_dev 5171 * devices to fail to get a link-local address. 5172 * 5173 * So, as a temporary fix, allocate the ipv6 structure for 5174 * loopback_dev first by hand. 5175 * Longer term, all of the dependencies ipv6 has upon the loopback 5176 * device and it being up should be removed. 5177 */ 5178 rtnl_lock(); 5179 if (!ipv6_add_dev(init_net.loopback_dev)) 5180 err = -ENOMEM; 5181 rtnl_unlock(); 5182 if (err) 5183 goto errlo; 5184 5185 for (i = 0; i < IN6_ADDR_HSIZE; i++) 5186 INIT_HLIST_HEAD(&inet6_addr_lst[i]); 5187 5188 register_netdevice_notifier(&ipv6_dev_notf); 5189 5190 addrconf_verify(0); 5191 5192 err = rtnl_af_register(&inet6_ops); 5193 if (err < 0) 5194 goto errout_af; 5195 5196 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo, 5197 NULL); 5198 if (err < 0) 5199 goto errout; 5200 5201 /* Only the first call to __rtnl_register can fail */ 5202 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL, NULL); 5203 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL, NULL); 5204 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr, 5205 inet6_dump_ifaddr, NULL); 5206 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL, 5207 inet6_dump_ifmcaddr, NULL); 5208 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL, 5209 inet6_dump_ifacaddr, NULL); 5210 __rtnl_register(PF_INET6, RTM_GETNETCONF, inet6_netconf_get_devconf, 5211 inet6_netconf_dump_devconf, NULL); 5212 5213 ipv6_addr_label_rtnl_register(); 5214 5215 return 0; 5216 errout: 5217 rtnl_af_unregister(&inet6_ops); 5218 errout_af: 5219 unregister_netdevice_notifier(&ipv6_dev_notf); 5220 errlo: 5221 unregister_pernet_subsys(&addrconf_ops); 5222 out_addrlabel: 5223 ipv6_addr_label_cleanup(); 5224 out: 5225 return err; 5226 } 5227 5228 void addrconf_cleanup(void) 5229 { 5230 struct net_device *dev; 5231 int i; 5232 5233 unregister_netdevice_notifier(&ipv6_dev_notf); 5234 unregister_pernet_subsys(&addrconf_ops); 5235 ipv6_addr_label_cleanup(); 5236 5237 rtnl_lock(); 5238 5239 __rtnl_af_unregister(&inet6_ops); 5240 5241 /* clean dev list */ 5242 for_each_netdev(&init_net, dev) { 5243 if (__in6_dev_get(dev) == NULL) 5244 continue; 5245 addrconf_ifdown(dev, 1); 5246 } 5247 addrconf_ifdown(init_net.loopback_dev, 2); 5248 5249 /* 5250 * Check hash table. 5251 */ 5252 spin_lock_bh(&addrconf_hash_lock); 5253 for (i = 0; i < IN6_ADDR_HSIZE; i++) 5254 WARN_ON(!hlist_empty(&inet6_addr_lst[i])); 5255 spin_unlock_bh(&addrconf_hash_lock); 5256 5257 del_timer(&addr_chk_timer); 5258 rtnl_unlock(); 5259 } 5260