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 = !max_addresses || 1130 ipv6_count_addresses(idev) < max_addresses ? 1131 ipv6_add_addr(idev, &addr, NULL, tmp_plen, 1132 ipv6_addr_scope(&addr), addr_flags, 1133 tmp_valid_lft, tmp_prefered_lft) : NULL; 1134 if (IS_ERR_OR_NULL(ift)) { 1135 in6_ifa_put(ifp); 1136 in6_dev_put(idev); 1137 pr_info("%s: retry temporary address regeneration\n", __func__); 1138 tmpaddr = &addr; 1139 write_lock(&idev->lock); 1140 goto retry; 1141 } 1142 1143 spin_lock_bh(&ift->lock); 1144 ift->ifpub = ifp; 1145 ift->cstamp = now; 1146 ift->tstamp = tmp_tstamp; 1147 spin_unlock_bh(&ift->lock); 1148 1149 addrconf_dad_start(ift); 1150 in6_ifa_put(ift); 1151 in6_dev_put(idev); 1152 out: 1153 return ret; 1154 } 1155 #endif 1156 1157 /* 1158 * Choose an appropriate source address (RFC3484) 1159 */ 1160 enum { 1161 IPV6_SADDR_RULE_INIT = 0, 1162 IPV6_SADDR_RULE_LOCAL, 1163 IPV6_SADDR_RULE_SCOPE, 1164 IPV6_SADDR_RULE_PREFERRED, 1165 #ifdef CONFIG_IPV6_MIP6 1166 IPV6_SADDR_RULE_HOA, 1167 #endif 1168 IPV6_SADDR_RULE_OIF, 1169 IPV6_SADDR_RULE_LABEL, 1170 #ifdef CONFIG_IPV6_PRIVACY 1171 IPV6_SADDR_RULE_PRIVACY, 1172 #endif 1173 IPV6_SADDR_RULE_ORCHID, 1174 IPV6_SADDR_RULE_PREFIX, 1175 IPV6_SADDR_RULE_MAX 1176 }; 1177 1178 struct ipv6_saddr_score { 1179 int rule; 1180 int addr_type; 1181 struct inet6_ifaddr *ifa; 1182 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX); 1183 int scopedist; 1184 int matchlen; 1185 }; 1186 1187 struct ipv6_saddr_dst { 1188 const struct in6_addr *addr; 1189 int ifindex; 1190 int scope; 1191 int label; 1192 unsigned int prefs; 1193 }; 1194 1195 static inline int ipv6_saddr_preferred(int type) 1196 { 1197 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK)) 1198 return 1; 1199 return 0; 1200 } 1201 1202 static int ipv6_get_saddr_eval(struct net *net, 1203 struct ipv6_saddr_score *score, 1204 struct ipv6_saddr_dst *dst, 1205 int i) 1206 { 1207 int ret; 1208 1209 if (i <= score->rule) { 1210 switch (i) { 1211 case IPV6_SADDR_RULE_SCOPE: 1212 ret = score->scopedist; 1213 break; 1214 case IPV6_SADDR_RULE_PREFIX: 1215 ret = score->matchlen; 1216 break; 1217 default: 1218 ret = !!test_bit(i, score->scorebits); 1219 } 1220 goto out; 1221 } 1222 1223 switch (i) { 1224 case IPV6_SADDR_RULE_INIT: 1225 /* Rule 0: remember if hiscore is not ready yet */ 1226 ret = !!score->ifa; 1227 break; 1228 case IPV6_SADDR_RULE_LOCAL: 1229 /* Rule 1: Prefer same address */ 1230 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr); 1231 break; 1232 case IPV6_SADDR_RULE_SCOPE: 1233 /* Rule 2: Prefer appropriate scope 1234 * 1235 * ret 1236 * ^ 1237 * -1 | d 15 1238 * ---+--+-+---> scope 1239 * | 1240 * | d is scope of the destination. 1241 * B-d | \ 1242 * | \ <- smaller scope is better if 1243 * B-15 | \ if scope is enough for destinaion. 1244 * | ret = B - scope (-1 <= scope >= d <= 15). 1245 * d-C-1 | / 1246 * |/ <- greater is better 1247 * -C / if scope is not enough for destination. 1248 * /| ret = scope - C (-1 <= d < scope <= 15). 1249 * 1250 * d - C - 1 < B -15 (for all -1 <= d <= 15). 1251 * C > d + 14 - B >= 15 + 14 - B = 29 - B. 1252 * Assume B = 0 and we get C > 29. 1253 */ 1254 ret = __ipv6_addr_src_scope(score->addr_type); 1255 if (ret >= dst->scope) 1256 ret = -ret; 1257 else 1258 ret -= 128; /* 30 is enough */ 1259 score->scopedist = ret; 1260 break; 1261 case IPV6_SADDR_RULE_PREFERRED: 1262 /* Rule 3: Avoid deprecated and optimistic addresses */ 1263 ret = ipv6_saddr_preferred(score->addr_type) || 1264 !(score->ifa->flags & (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC)); 1265 break; 1266 #ifdef CONFIG_IPV6_MIP6 1267 case IPV6_SADDR_RULE_HOA: 1268 { 1269 /* Rule 4: Prefer home address */ 1270 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA); 1271 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome; 1272 break; 1273 } 1274 #endif 1275 case IPV6_SADDR_RULE_OIF: 1276 /* Rule 5: Prefer outgoing interface */ 1277 ret = (!dst->ifindex || 1278 dst->ifindex == score->ifa->idev->dev->ifindex); 1279 break; 1280 case IPV6_SADDR_RULE_LABEL: 1281 /* Rule 6: Prefer matching label */ 1282 ret = ipv6_addr_label(net, 1283 &score->ifa->addr, score->addr_type, 1284 score->ifa->idev->dev->ifindex) == dst->label; 1285 break; 1286 #ifdef CONFIG_IPV6_PRIVACY 1287 case IPV6_SADDR_RULE_PRIVACY: 1288 { 1289 /* Rule 7: Prefer public address 1290 * Note: prefer temporary address if use_tempaddr >= 2 1291 */ 1292 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ? 1293 !!(dst->prefs & IPV6_PREFER_SRC_TMP) : 1294 score->ifa->idev->cnf.use_tempaddr >= 2; 1295 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp; 1296 break; 1297 } 1298 #endif 1299 case IPV6_SADDR_RULE_ORCHID: 1300 /* Rule 8-: Prefer ORCHID vs ORCHID or 1301 * non-ORCHID vs non-ORCHID 1302 */ 1303 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^ 1304 ipv6_addr_orchid(dst->addr)); 1305 break; 1306 case IPV6_SADDR_RULE_PREFIX: 1307 /* Rule 8: Use longest matching prefix */ 1308 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr); 1309 if (ret > score->ifa->prefix_len) 1310 ret = score->ifa->prefix_len; 1311 score->matchlen = ret; 1312 break; 1313 default: 1314 ret = 0; 1315 } 1316 1317 if (ret) 1318 __set_bit(i, score->scorebits); 1319 score->rule = i; 1320 out: 1321 return ret; 1322 } 1323 1324 int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev, 1325 const struct in6_addr *daddr, unsigned int prefs, 1326 struct in6_addr *saddr) 1327 { 1328 struct ipv6_saddr_score scores[2], 1329 *score = &scores[0], *hiscore = &scores[1]; 1330 struct ipv6_saddr_dst dst; 1331 struct net_device *dev; 1332 int dst_type; 1333 1334 dst_type = __ipv6_addr_type(daddr); 1335 dst.addr = daddr; 1336 dst.ifindex = dst_dev ? dst_dev->ifindex : 0; 1337 dst.scope = __ipv6_addr_src_scope(dst_type); 1338 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex); 1339 dst.prefs = prefs; 1340 1341 hiscore->rule = -1; 1342 hiscore->ifa = NULL; 1343 1344 rcu_read_lock(); 1345 1346 for_each_netdev_rcu(net, dev) { 1347 struct inet6_dev *idev; 1348 1349 /* Candidate Source Address (section 4) 1350 * - multicast and link-local destination address, 1351 * the set of candidate source address MUST only 1352 * include addresses assigned to interfaces 1353 * belonging to the same link as the outgoing 1354 * interface. 1355 * (- For site-local destination addresses, the 1356 * set of candidate source addresses MUST only 1357 * include addresses assigned to interfaces 1358 * belonging to the same site as the outgoing 1359 * interface.) 1360 */ 1361 if (((dst_type & IPV6_ADDR_MULTICAST) || 1362 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL) && 1363 dst.ifindex && dev->ifindex != dst.ifindex) 1364 continue; 1365 1366 idev = __in6_dev_get(dev); 1367 if (!idev) 1368 continue; 1369 1370 read_lock_bh(&idev->lock); 1371 list_for_each_entry(score->ifa, &idev->addr_list, if_list) { 1372 int i; 1373 1374 /* 1375 * - Tentative Address (RFC2462 section 5.4) 1376 * - A tentative address is not considered 1377 * "assigned to an interface" in the traditional 1378 * sense, unless it is also flagged as optimistic. 1379 * - Candidate Source Address (section 4) 1380 * - In any case, anycast addresses, multicast 1381 * addresses, and the unspecified address MUST 1382 * NOT be included in a candidate set. 1383 */ 1384 if ((score->ifa->flags & IFA_F_TENTATIVE) && 1385 (!(score->ifa->flags & IFA_F_OPTIMISTIC))) 1386 continue; 1387 1388 score->addr_type = __ipv6_addr_type(&score->ifa->addr); 1389 1390 if (unlikely(score->addr_type == IPV6_ADDR_ANY || 1391 score->addr_type & IPV6_ADDR_MULTICAST)) { 1392 LIMIT_NETDEBUG(KERN_DEBUG 1393 "ADDRCONF: unspecified / multicast address " 1394 "assigned as unicast address on %s", 1395 dev->name); 1396 continue; 1397 } 1398 1399 score->rule = -1; 1400 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX); 1401 1402 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) { 1403 int minihiscore, miniscore; 1404 1405 minihiscore = ipv6_get_saddr_eval(net, hiscore, &dst, i); 1406 miniscore = ipv6_get_saddr_eval(net, score, &dst, i); 1407 1408 if (minihiscore > miniscore) { 1409 if (i == IPV6_SADDR_RULE_SCOPE && 1410 score->scopedist > 0) { 1411 /* 1412 * special case: 1413 * each remaining entry 1414 * has too small (not enough) 1415 * scope, because ifa entries 1416 * are sorted by their scope 1417 * values. 1418 */ 1419 goto try_nextdev; 1420 } 1421 break; 1422 } else if (minihiscore < miniscore) { 1423 if (hiscore->ifa) 1424 in6_ifa_put(hiscore->ifa); 1425 1426 in6_ifa_hold(score->ifa); 1427 1428 swap(hiscore, score); 1429 1430 /* restore our iterator */ 1431 score->ifa = hiscore->ifa; 1432 1433 break; 1434 } 1435 } 1436 } 1437 try_nextdev: 1438 read_unlock_bh(&idev->lock); 1439 } 1440 rcu_read_unlock(); 1441 1442 if (!hiscore->ifa) 1443 return -EADDRNOTAVAIL; 1444 1445 *saddr = hiscore->ifa->addr; 1446 in6_ifa_put(hiscore->ifa); 1447 return 0; 1448 } 1449 EXPORT_SYMBOL(ipv6_dev_get_saddr); 1450 1451 int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr, 1452 unsigned char banned_flags) 1453 { 1454 struct inet6_ifaddr *ifp; 1455 int err = -EADDRNOTAVAIL; 1456 1457 list_for_each_entry(ifp, &idev->addr_list, if_list) { 1458 if (ifp->scope == IFA_LINK && 1459 !(ifp->flags & banned_flags)) { 1460 *addr = ifp->addr; 1461 err = 0; 1462 break; 1463 } 1464 } 1465 return err; 1466 } 1467 1468 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr, 1469 unsigned char banned_flags) 1470 { 1471 struct inet6_dev *idev; 1472 int err = -EADDRNOTAVAIL; 1473 1474 rcu_read_lock(); 1475 idev = __in6_dev_get(dev); 1476 if (idev) { 1477 read_lock_bh(&idev->lock); 1478 err = __ipv6_get_lladdr(idev, addr, banned_flags); 1479 read_unlock_bh(&idev->lock); 1480 } 1481 rcu_read_unlock(); 1482 return err; 1483 } 1484 1485 static int ipv6_count_addresses(struct inet6_dev *idev) 1486 { 1487 int cnt = 0; 1488 struct inet6_ifaddr *ifp; 1489 1490 read_lock_bh(&idev->lock); 1491 list_for_each_entry(ifp, &idev->addr_list, if_list) 1492 cnt++; 1493 read_unlock_bh(&idev->lock); 1494 return cnt; 1495 } 1496 1497 int ipv6_chk_addr(struct net *net, const struct in6_addr *addr, 1498 const struct net_device *dev, int strict) 1499 { 1500 struct inet6_ifaddr *ifp; 1501 unsigned int hash = inet6_addr_hash(addr); 1502 1503 rcu_read_lock_bh(); 1504 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) { 1505 if (!net_eq(dev_net(ifp->idev->dev), net)) 1506 continue; 1507 if (ipv6_addr_equal(&ifp->addr, addr) && 1508 !(ifp->flags&IFA_F_TENTATIVE) && 1509 (dev == NULL || ifp->idev->dev == dev || 1510 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) { 1511 rcu_read_unlock_bh(); 1512 return 1; 1513 } 1514 } 1515 1516 rcu_read_unlock_bh(); 1517 return 0; 1518 } 1519 EXPORT_SYMBOL(ipv6_chk_addr); 1520 1521 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr, 1522 struct net_device *dev) 1523 { 1524 unsigned int hash = inet6_addr_hash(addr); 1525 struct inet6_ifaddr *ifp; 1526 1527 hlist_for_each_entry(ifp, &inet6_addr_lst[hash], addr_lst) { 1528 if (!net_eq(dev_net(ifp->idev->dev), net)) 1529 continue; 1530 if (ipv6_addr_equal(&ifp->addr, addr)) { 1531 if (dev == NULL || ifp->idev->dev == dev) 1532 return true; 1533 } 1534 } 1535 return false; 1536 } 1537 1538 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev) 1539 { 1540 struct inet6_dev *idev; 1541 struct inet6_ifaddr *ifa; 1542 int onlink; 1543 1544 onlink = 0; 1545 rcu_read_lock(); 1546 idev = __in6_dev_get(dev); 1547 if (idev) { 1548 read_lock_bh(&idev->lock); 1549 list_for_each_entry(ifa, &idev->addr_list, if_list) { 1550 onlink = ipv6_prefix_equal(addr, &ifa->addr, 1551 ifa->prefix_len); 1552 if (onlink) 1553 break; 1554 } 1555 read_unlock_bh(&idev->lock); 1556 } 1557 rcu_read_unlock(); 1558 return onlink; 1559 } 1560 EXPORT_SYMBOL(ipv6_chk_prefix); 1561 1562 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr, 1563 struct net_device *dev, int strict) 1564 { 1565 struct inet6_ifaddr *ifp, *result = NULL; 1566 unsigned int hash = inet6_addr_hash(addr); 1567 1568 rcu_read_lock_bh(); 1569 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) { 1570 if (!net_eq(dev_net(ifp->idev->dev), net)) 1571 continue; 1572 if (ipv6_addr_equal(&ifp->addr, addr)) { 1573 if (dev == NULL || ifp->idev->dev == dev || 1574 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) { 1575 result = ifp; 1576 in6_ifa_hold(ifp); 1577 break; 1578 } 1579 } 1580 } 1581 rcu_read_unlock_bh(); 1582 1583 return result; 1584 } 1585 1586 /* Gets referenced address, destroys ifaddr */ 1587 1588 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed) 1589 { 1590 if (ifp->flags&IFA_F_PERMANENT) { 1591 spin_lock_bh(&ifp->lock); 1592 addrconf_del_dad_timer(ifp); 1593 ifp->flags |= IFA_F_TENTATIVE; 1594 if (dad_failed) 1595 ifp->flags |= IFA_F_DADFAILED; 1596 spin_unlock_bh(&ifp->lock); 1597 if (dad_failed) 1598 ipv6_ifa_notify(0, ifp); 1599 in6_ifa_put(ifp); 1600 #ifdef CONFIG_IPV6_PRIVACY 1601 } else if (ifp->flags&IFA_F_TEMPORARY) { 1602 struct inet6_ifaddr *ifpub; 1603 spin_lock_bh(&ifp->lock); 1604 ifpub = ifp->ifpub; 1605 if (ifpub) { 1606 in6_ifa_hold(ifpub); 1607 spin_unlock_bh(&ifp->lock); 1608 ipv6_create_tempaddr(ifpub, ifp); 1609 in6_ifa_put(ifpub); 1610 } else { 1611 spin_unlock_bh(&ifp->lock); 1612 } 1613 ipv6_del_addr(ifp); 1614 #endif 1615 } else 1616 ipv6_del_addr(ifp); 1617 } 1618 1619 static int addrconf_dad_end(struct inet6_ifaddr *ifp) 1620 { 1621 int err = -ENOENT; 1622 1623 spin_lock(&ifp->state_lock); 1624 if (ifp->state == INET6_IFADDR_STATE_DAD) { 1625 ifp->state = INET6_IFADDR_STATE_POSTDAD; 1626 err = 0; 1627 } 1628 spin_unlock(&ifp->state_lock); 1629 1630 return err; 1631 } 1632 1633 void addrconf_dad_failure(struct inet6_ifaddr *ifp) 1634 { 1635 struct inet6_dev *idev = ifp->idev; 1636 1637 if (addrconf_dad_end(ifp)) { 1638 in6_ifa_put(ifp); 1639 return; 1640 } 1641 1642 net_info_ratelimited("%s: IPv6 duplicate address %pI6c detected!\n", 1643 ifp->idev->dev->name, &ifp->addr); 1644 1645 if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6) { 1646 struct in6_addr addr; 1647 1648 addr.s6_addr32[0] = htonl(0xfe800000); 1649 addr.s6_addr32[1] = 0; 1650 1651 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) && 1652 ipv6_addr_equal(&ifp->addr, &addr)) { 1653 /* DAD failed for link-local based on MAC address */ 1654 idev->cnf.disable_ipv6 = 1; 1655 1656 pr_info("%s: IPv6 being disabled!\n", 1657 ifp->idev->dev->name); 1658 } 1659 } 1660 1661 addrconf_dad_stop(ifp, 1); 1662 } 1663 1664 /* Join to solicited addr multicast group. */ 1665 1666 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr) 1667 { 1668 struct in6_addr maddr; 1669 1670 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP)) 1671 return; 1672 1673 addrconf_addr_solict_mult(addr, &maddr); 1674 ipv6_dev_mc_inc(dev, &maddr); 1675 } 1676 1677 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr) 1678 { 1679 struct in6_addr maddr; 1680 1681 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP)) 1682 return; 1683 1684 addrconf_addr_solict_mult(addr, &maddr); 1685 __ipv6_dev_mc_dec(idev, &maddr); 1686 } 1687 1688 static void addrconf_join_anycast(struct inet6_ifaddr *ifp) 1689 { 1690 struct in6_addr addr; 1691 if (ifp->prefix_len == 127) /* RFC 6164 */ 1692 return; 1693 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len); 1694 if (ipv6_addr_any(&addr)) 1695 return; 1696 ipv6_dev_ac_inc(ifp->idev->dev, &addr); 1697 } 1698 1699 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp) 1700 { 1701 struct in6_addr addr; 1702 if (ifp->prefix_len == 127) /* RFC 6164 */ 1703 return; 1704 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len); 1705 if (ipv6_addr_any(&addr)) 1706 return; 1707 __ipv6_dev_ac_dec(ifp->idev, &addr); 1708 } 1709 1710 static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev) 1711 { 1712 if (dev->addr_len != ETH_ALEN) 1713 return -1; 1714 memcpy(eui, dev->dev_addr, 3); 1715 memcpy(eui + 5, dev->dev_addr + 3, 3); 1716 1717 /* 1718 * The zSeries OSA network cards can be shared among various 1719 * OS instances, but the OSA cards have only one MAC address. 1720 * This leads to duplicate address conflicts in conjunction 1721 * with IPv6 if more than one instance uses the same card. 1722 * 1723 * The driver for these cards can deliver a unique 16-bit 1724 * identifier for each instance sharing the same card. It is 1725 * placed instead of 0xFFFE in the interface identifier. The 1726 * "u" bit of the interface identifier is not inverted in this 1727 * case. Hence the resulting interface identifier has local 1728 * scope according to RFC2373. 1729 */ 1730 if (dev->dev_id) { 1731 eui[3] = (dev->dev_id >> 8) & 0xFF; 1732 eui[4] = dev->dev_id & 0xFF; 1733 } else { 1734 eui[3] = 0xFF; 1735 eui[4] = 0xFE; 1736 eui[0] ^= 2; 1737 } 1738 return 0; 1739 } 1740 1741 static int addrconf_ifid_eui64(u8 *eui, struct net_device *dev) 1742 { 1743 if (dev->addr_len != IEEE802154_ADDR_LEN) 1744 return -1; 1745 memcpy(eui, dev->dev_addr, 8); 1746 eui[0] ^= 2; 1747 return 0; 1748 } 1749 1750 static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev) 1751 { 1752 union fwnet_hwaddr *ha; 1753 1754 if (dev->addr_len != FWNET_ALEN) 1755 return -1; 1756 1757 ha = (union fwnet_hwaddr *)dev->dev_addr; 1758 1759 memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id)); 1760 eui[0] ^= 2; 1761 return 0; 1762 } 1763 1764 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev) 1765 { 1766 /* XXX: inherit EUI-64 from other interface -- yoshfuji */ 1767 if (dev->addr_len != ARCNET_ALEN) 1768 return -1; 1769 memset(eui, 0, 7); 1770 eui[7] = *(u8 *)dev->dev_addr; 1771 return 0; 1772 } 1773 1774 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev) 1775 { 1776 if (dev->addr_len != INFINIBAND_ALEN) 1777 return -1; 1778 memcpy(eui, dev->dev_addr + 12, 8); 1779 eui[0] |= 2; 1780 return 0; 1781 } 1782 1783 static int __ipv6_isatap_ifid(u8 *eui, __be32 addr) 1784 { 1785 if (addr == 0) 1786 return -1; 1787 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) || 1788 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) || 1789 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) || 1790 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) || 1791 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) || 1792 ipv4_is_lbcast(addr)) ? 0x00 : 0x02; 1793 eui[1] = 0; 1794 eui[2] = 0x5E; 1795 eui[3] = 0xFE; 1796 memcpy(eui + 4, &addr, 4); 1797 return 0; 1798 } 1799 1800 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev) 1801 { 1802 if (dev->priv_flags & IFF_ISATAP) 1803 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr); 1804 return -1; 1805 } 1806 1807 static int addrconf_ifid_gre(u8 *eui, struct net_device *dev) 1808 { 1809 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr); 1810 } 1811 1812 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev) 1813 { 1814 switch (dev->type) { 1815 case ARPHRD_ETHER: 1816 case ARPHRD_FDDI: 1817 return addrconf_ifid_eui48(eui, dev); 1818 case ARPHRD_ARCNET: 1819 return addrconf_ifid_arcnet(eui, dev); 1820 case ARPHRD_INFINIBAND: 1821 return addrconf_ifid_infiniband(eui, dev); 1822 case ARPHRD_SIT: 1823 return addrconf_ifid_sit(eui, dev); 1824 case ARPHRD_IPGRE: 1825 return addrconf_ifid_gre(eui, dev); 1826 case ARPHRD_IEEE802154: 1827 return addrconf_ifid_eui64(eui, dev); 1828 case ARPHRD_IEEE1394: 1829 return addrconf_ifid_ieee1394(eui, dev); 1830 } 1831 return -1; 1832 } 1833 1834 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev) 1835 { 1836 int err = -1; 1837 struct inet6_ifaddr *ifp; 1838 1839 read_lock_bh(&idev->lock); 1840 list_for_each_entry(ifp, &idev->addr_list, if_list) { 1841 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) { 1842 memcpy(eui, ifp->addr.s6_addr+8, 8); 1843 err = 0; 1844 break; 1845 } 1846 } 1847 read_unlock_bh(&idev->lock); 1848 return err; 1849 } 1850 1851 #ifdef CONFIG_IPV6_PRIVACY 1852 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */ 1853 static void __ipv6_regen_rndid(struct inet6_dev *idev) 1854 { 1855 regen: 1856 get_random_bytes(idev->rndid, sizeof(idev->rndid)); 1857 idev->rndid[0] &= ~0x02; 1858 1859 /* 1860 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>: 1861 * check if generated address is not inappropriate 1862 * 1863 * - Reserved subnet anycast (RFC 2526) 1864 * 11111101 11....11 1xxxxxxx 1865 * - ISATAP (RFC4214) 6.1 1866 * 00-00-5E-FE-xx-xx-xx-xx 1867 * - value 0 1868 * - XXX: already assigned to an address on the device 1869 */ 1870 if (idev->rndid[0] == 0xfd && 1871 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff && 1872 (idev->rndid[7]&0x80)) 1873 goto regen; 1874 if ((idev->rndid[0]|idev->rndid[1]) == 0) { 1875 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe) 1876 goto regen; 1877 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00) 1878 goto regen; 1879 } 1880 } 1881 1882 static void ipv6_regen_rndid(unsigned long data) 1883 { 1884 struct inet6_dev *idev = (struct inet6_dev *) data; 1885 unsigned long expires; 1886 1887 rcu_read_lock_bh(); 1888 write_lock_bh(&idev->lock); 1889 1890 if (idev->dead) 1891 goto out; 1892 1893 __ipv6_regen_rndid(idev); 1894 1895 expires = jiffies + 1896 idev->cnf.temp_prefered_lft * HZ - 1897 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time - 1898 idev->cnf.max_desync_factor * HZ; 1899 if (time_before(expires, jiffies)) { 1900 pr_warn("%s: too short regeneration interval; timer disabled for %s\n", 1901 __func__, idev->dev->name); 1902 goto out; 1903 } 1904 1905 if (!mod_timer(&idev->regen_timer, expires)) 1906 in6_dev_hold(idev); 1907 1908 out: 1909 write_unlock_bh(&idev->lock); 1910 rcu_read_unlock_bh(); 1911 in6_dev_put(idev); 1912 } 1913 1914 static void __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) 1915 { 1916 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0) 1917 __ipv6_regen_rndid(idev); 1918 } 1919 #endif 1920 1921 /* 1922 * Add prefix route. 1923 */ 1924 1925 static void 1926 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev, 1927 unsigned long expires, u32 flags) 1928 { 1929 struct fib6_config cfg = { 1930 .fc_table = RT6_TABLE_PREFIX, 1931 .fc_metric = IP6_RT_PRIO_ADDRCONF, 1932 .fc_ifindex = dev->ifindex, 1933 .fc_expires = expires, 1934 .fc_dst_len = plen, 1935 .fc_flags = RTF_UP | flags, 1936 .fc_nlinfo.nl_net = dev_net(dev), 1937 .fc_protocol = RTPROT_KERNEL, 1938 }; 1939 1940 cfg.fc_dst = *pfx; 1941 1942 /* Prevent useless cloning on PtP SIT. 1943 This thing is done here expecting that the whole 1944 class of non-broadcast devices need not cloning. 1945 */ 1946 #if IS_ENABLED(CONFIG_IPV6_SIT) 1947 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT)) 1948 cfg.fc_flags |= RTF_NONEXTHOP; 1949 #endif 1950 1951 ip6_route_add(&cfg); 1952 } 1953 1954 1955 static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx, 1956 int plen, 1957 const struct net_device *dev, 1958 u32 flags, u32 noflags) 1959 { 1960 struct fib6_node *fn; 1961 struct rt6_info *rt = NULL; 1962 struct fib6_table *table; 1963 1964 table = fib6_get_table(dev_net(dev), RT6_TABLE_PREFIX); 1965 if (table == NULL) 1966 return NULL; 1967 1968 read_lock_bh(&table->tb6_lock); 1969 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0); 1970 if (!fn) 1971 goto out; 1972 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) { 1973 if (rt->dst.dev->ifindex != dev->ifindex) 1974 continue; 1975 if ((rt->rt6i_flags & flags) != flags) 1976 continue; 1977 if ((rt->rt6i_flags & noflags) != 0) 1978 continue; 1979 dst_hold(&rt->dst); 1980 break; 1981 } 1982 out: 1983 read_unlock_bh(&table->tb6_lock); 1984 return rt; 1985 } 1986 1987 1988 /* Create "default" multicast route to the interface */ 1989 1990 static void addrconf_add_mroute(struct net_device *dev) 1991 { 1992 struct fib6_config cfg = { 1993 .fc_table = RT6_TABLE_LOCAL, 1994 .fc_metric = IP6_RT_PRIO_ADDRCONF, 1995 .fc_ifindex = dev->ifindex, 1996 .fc_dst_len = 8, 1997 .fc_flags = RTF_UP, 1998 .fc_nlinfo.nl_net = dev_net(dev), 1999 }; 2000 2001 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0); 2002 2003 ip6_route_add(&cfg); 2004 } 2005 2006 #if IS_ENABLED(CONFIG_IPV6_SIT) 2007 static void sit_route_add(struct net_device *dev) 2008 { 2009 struct fib6_config cfg = { 2010 .fc_table = RT6_TABLE_MAIN, 2011 .fc_metric = IP6_RT_PRIO_ADDRCONF, 2012 .fc_ifindex = dev->ifindex, 2013 .fc_dst_len = 96, 2014 .fc_flags = RTF_UP | RTF_NONEXTHOP, 2015 .fc_nlinfo.nl_net = dev_net(dev), 2016 }; 2017 2018 /* prefix length - 96 bits "::d.d.d.d" */ 2019 ip6_route_add(&cfg); 2020 } 2021 #endif 2022 2023 static struct inet6_dev *addrconf_add_dev(struct net_device *dev) 2024 { 2025 struct inet6_dev *idev; 2026 2027 ASSERT_RTNL(); 2028 2029 idev = ipv6_find_idev(dev); 2030 if (!idev) 2031 return ERR_PTR(-ENOBUFS); 2032 2033 if (idev->cnf.disable_ipv6) 2034 return ERR_PTR(-EACCES); 2035 2036 /* Add default multicast route */ 2037 if (!(dev->flags & IFF_LOOPBACK)) 2038 addrconf_add_mroute(dev); 2039 2040 return idev; 2041 } 2042 2043 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao) 2044 { 2045 struct prefix_info *pinfo; 2046 __u32 valid_lft; 2047 __u32 prefered_lft; 2048 int addr_type; 2049 struct inet6_dev *in6_dev; 2050 struct net *net = dev_net(dev); 2051 2052 pinfo = (struct prefix_info *) opt; 2053 2054 if (len < sizeof(struct prefix_info)) { 2055 ADBG(("addrconf: prefix option too short\n")); 2056 return; 2057 } 2058 2059 /* 2060 * Validation checks ([ADDRCONF], page 19) 2061 */ 2062 2063 addr_type = ipv6_addr_type(&pinfo->prefix); 2064 2065 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL)) 2066 return; 2067 2068 valid_lft = ntohl(pinfo->valid); 2069 prefered_lft = ntohl(pinfo->prefered); 2070 2071 if (prefered_lft > valid_lft) { 2072 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n"); 2073 return; 2074 } 2075 2076 in6_dev = in6_dev_get(dev); 2077 2078 if (in6_dev == NULL) { 2079 net_dbg_ratelimited("addrconf: device %s not configured\n", 2080 dev->name); 2081 return; 2082 } 2083 2084 /* 2085 * Two things going on here: 2086 * 1) Add routes for on-link prefixes 2087 * 2) Configure prefixes with the auto flag set 2088 */ 2089 2090 if (pinfo->onlink) { 2091 struct rt6_info *rt; 2092 unsigned long rt_expires; 2093 2094 /* Avoid arithmetic overflow. Really, we could 2095 * save rt_expires in seconds, likely valid_lft, 2096 * but it would require division in fib gc, that it 2097 * not good. 2098 */ 2099 if (HZ > USER_HZ) 2100 rt_expires = addrconf_timeout_fixup(valid_lft, HZ); 2101 else 2102 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ); 2103 2104 if (addrconf_finite_timeout(rt_expires)) 2105 rt_expires *= HZ; 2106 2107 rt = addrconf_get_prefix_route(&pinfo->prefix, 2108 pinfo->prefix_len, 2109 dev, 2110 RTF_ADDRCONF | RTF_PREFIX_RT, 2111 RTF_GATEWAY | RTF_DEFAULT); 2112 2113 if (rt) { 2114 /* Autoconf prefix route */ 2115 if (valid_lft == 0) { 2116 ip6_del_rt(rt); 2117 rt = NULL; 2118 } else if (addrconf_finite_timeout(rt_expires)) { 2119 /* not infinity */ 2120 rt6_set_expires(rt, jiffies + rt_expires); 2121 } else { 2122 rt6_clean_expires(rt); 2123 } 2124 } else if (valid_lft) { 2125 clock_t expires = 0; 2126 int flags = RTF_ADDRCONF | RTF_PREFIX_RT; 2127 if (addrconf_finite_timeout(rt_expires)) { 2128 /* not infinity */ 2129 flags |= RTF_EXPIRES; 2130 expires = jiffies_to_clock_t(rt_expires); 2131 } 2132 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len, 2133 dev, expires, flags); 2134 } 2135 ip6_rt_put(rt); 2136 } 2137 2138 /* Try to figure out our local address for this prefix */ 2139 2140 if (pinfo->autoconf && in6_dev->cnf.autoconf) { 2141 struct inet6_ifaddr *ifp; 2142 struct in6_addr addr; 2143 int create = 0, update_lft = 0; 2144 bool tokenized = false; 2145 2146 if (pinfo->prefix_len == 64) { 2147 memcpy(&addr, &pinfo->prefix, 8); 2148 2149 if (!ipv6_addr_any(&in6_dev->token)) { 2150 read_lock_bh(&in6_dev->lock); 2151 memcpy(addr.s6_addr + 8, 2152 in6_dev->token.s6_addr + 8, 8); 2153 read_unlock_bh(&in6_dev->lock); 2154 tokenized = true; 2155 } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) && 2156 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) { 2157 in6_dev_put(in6_dev); 2158 return; 2159 } 2160 goto ok; 2161 } 2162 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n", 2163 pinfo->prefix_len); 2164 in6_dev_put(in6_dev); 2165 return; 2166 2167 ok: 2168 2169 ifp = ipv6_get_ifaddr(net, &addr, dev, 1); 2170 2171 if (ifp == NULL && valid_lft) { 2172 int max_addresses = in6_dev->cnf.max_addresses; 2173 u32 addr_flags = 0; 2174 2175 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 2176 if (in6_dev->cnf.optimistic_dad && 2177 !net->ipv6.devconf_all->forwarding && sllao) 2178 addr_flags = IFA_F_OPTIMISTIC; 2179 #endif 2180 2181 /* Do not allow to create too much of autoconfigured 2182 * addresses; this would be too easy way to crash kernel. 2183 */ 2184 if (!max_addresses || 2185 ipv6_count_addresses(in6_dev) < max_addresses) 2186 ifp = ipv6_add_addr(in6_dev, &addr, NULL, 2187 pinfo->prefix_len, 2188 addr_type&IPV6_ADDR_SCOPE_MASK, 2189 addr_flags, valid_lft, 2190 prefered_lft); 2191 2192 if (IS_ERR_OR_NULL(ifp)) { 2193 in6_dev_put(in6_dev); 2194 return; 2195 } 2196 2197 update_lft = 0; 2198 create = 1; 2199 ifp->cstamp = jiffies; 2200 ifp->tokenized = tokenized; 2201 addrconf_dad_start(ifp); 2202 } 2203 2204 if (ifp) { 2205 int flags; 2206 unsigned long now; 2207 #ifdef CONFIG_IPV6_PRIVACY 2208 struct inet6_ifaddr *ift; 2209 #endif 2210 u32 stored_lft; 2211 2212 /* update lifetime (RFC2462 5.5.3 e) */ 2213 spin_lock(&ifp->lock); 2214 now = jiffies; 2215 if (ifp->valid_lft > (now - ifp->tstamp) / HZ) 2216 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ; 2217 else 2218 stored_lft = 0; 2219 if (!update_lft && !create && stored_lft) { 2220 if (valid_lft > MIN_VALID_LIFETIME || 2221 valid_lft > stored_lft) 2222 update_lft = 1; 2223 else if (stored_lft <= MIN_VALID_LIFETIME) { 2224 /* valid_lft <= stored_lft is always true */ 2225 /* 2226 * RFC 4862 Section 5.5.3e: 2227 * "Note that the preferred lifetime of 2228 * the corresponding address is always 2229 * reset to the Preferred Lifetime in 2230 * the received Prefix Information 2231 * option, regardless of whether the 2232 * valid lifetime is also reset or 2233 * ignored." 2234 * 2235 * So if the preferred lifetime in 2236 * this advertisement is different 2237 * than what we have stored, but the 2238 * valid lifetime is invalid, just 2239 * reset prefered_lft. 2240 * 2241 * We must set the valid lifetime 2242 * to the stored lifetime since we'll 2243 * be updating the timestamp below, 2244 * else we'll set it back to the 2245 * minimum. 2246 */ 2247 if (prefered_lft != ifp->prefered_lft) { 2248 valid_lft = stored_lft; 2249 update_lft = 1; 2250 } 2251 } else { 2252 valid_lft = MIN_VALID_LIFETIME; 2253 if (valid_lft < prefered_lft) 2254 prefered_lft = valid_lft; 2255 update_lft = 1; 2256 } 2257 } 2258 2259 if (update_lft) { 2260 ifp->valid_lft = valid_lft; 2261 ifp->prefered_lft = prefered_lft; 2262 ifp->tstamp = now; 2263 flags = ifp->flags; 2264 ifp->flags &= ~IFA_F_DEPRECATED; 2265 spin_unlock(&ifp->lock); 2266 2267 if (!(flags&IFA_F_TENTATIVE)) 2268 ipv6_ifa_notify(0, ifp); 2269 } else 2270 spin_unlock(&ifp->lock); 2271 2272 #ifdef CONFIG_IPV6_PRIVACY 2273 read_lock_bh(&in6_dev->lock); 2274 /* update all temporary addresses in the list */ 2275 list_for_each_entry(ift, &in6_dev->tempaddr_list, 2276 tmp_list) { 2277 int age, max_valid, max_prefered; 2278 2279 if (ifp != ift->ifpub) 2280 continue; 2281 2282 /* 2283 * RFC 4941 section 3.3: 2284 * If a received option will extend the lifetime 2285 * of a public address, the lifetimes of 2286 * temporary addresses should be extended, 2287 * subject to the overall constraint that no 2288 * temporary addresses should ever remain 2289 * "valid" or "preferred" for a time longer than 2290 * (TEMP_VALID_LIFETIME) or 2291 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), 2292 * respectively. 2293 */ 2294 age = (now - ift->cstamp) / HZ; 2295 max_valid = in6_dev->cnf.temp_valid_lft - age; 2296 if (max_valid < 0) 2297 max_valid = 0; 2298 2299 max_prefered = in6_dev->cnf.temp_prefered_lft - 2300 in6_dev->cnf.max_desync_factor - 2301 age; 2302 if (max_prefered < 0) 2303 max_prefered = 0; 2304 2305 if (valid_lft > max_valid) 2306 valid_lft = max_valid; 2307 2308 if (prefered_lft > max_prefered) 2309 prefered_lft = max_prefered; 2310 2311 spin_lock(&ift->lock); 2312 flags = ift->flags; 2313 ift->valid_lft = valid_lft; 2314 ift->prefered_lft = prefered_lft; 2315 ift->tstamp = now; 2316 if (prefered_lft > 0) 2317 ift->flags &= ~IFA_F_DEPRECATED; 2318 2319 spin_unlock(&ift->lock); 2320 if (!(flags&IFA_F_TENTATIVE)) 2321 ipv6_ifa_notify(0, ift); 2322 } 2323 2324 if ((create || list_empty(&in6_dev->tempaddr_list)) && in6_dev->cnf.use_tempaddr > 0) { 2325 /* 2326 * When a new public address is created as 2327 * described in [ADDRCONF], also create a new 2328 * temporary address. Also create a temporary 2329 * address if it's enabled but no temporary 2330 * address currently exists. 2331 */ 2332 read_unlock_bh(&in6_dev->lock); 2333 ipv6_create_tempaddr(ifp, NULL); 2334 } else { 2335 read_unlock_bh(&in6_dev->lock); 2336 } 2337 #endif 2338 in6_ifa_put(ifp); 2339 addrconf_verify(0); 2340 } 2341 } 2342 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo); 2343 in6_dev_put(in6_dev); 2344 } 2345 2346 /* 2347 * Set destination address. 2348 * Special case for SIT interfaces where we create a new "virtual" 2349 * device. 2350 */ 2351 int addrconf_set_dstaddr(struct net *net, void __user *arg) 2352 { 2353 struct in6_ifreq ireq; 2354 struct net_device *dev; 2355 int err = -EINVAL; 2356 2357 rtnl_lock(); 2358 2359 err = -EFAULT; 2360 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2361 goto err_exit; 2362 2363 dev = __dev_get_by_index(net, ireq.ifr6_ifindex); 2364 2365 err = -ENODEV; 2366 if (dev == NULL) 2367 goto err_exit; 2368 2369 #if IS_ENABLED(CONFIG_IPV6_SIT) 2370 if (dev->type == ARPHRD_SIT) { 2371 const struct net_device_ops *ops = dev->netdev_ops; 2372 struct ifreq ifr; 2373 struct ip_tunnel_parm p; 2374 2375 err = -EADDRNOTAVAIL; 2376 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4)) 2377 goto err_exit; 2378 2379 memset(&p, 0, sizeof(p)); 2380 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3]; 2381 p.iph.saddr = 0; 2382 p.iph.version = 4; 2383 p.iph.ihl = 5; 2384 p.iph.protocol = IPPROTO_IPV6; 2385 p.iph.ttl = 64; 2386 ifr.ifr_ifru.ifru_data = (__force void __user *)&p; 2387 2388 if (ops->ndo_do_ioctl) { 2389 mm_segment_t oldfs = get_fs(); 2390 2391 set_fs(KERNEL_DS); 2392 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL); 2393 set_fs(oldfs); 2394 } else 2395 err = -EOPNOTSUPP; 2396 2397 if (err == 0) { 2398 err = -ENOBUFS; 2399 dev = __dev_get_by_name(net, p.name); 2400 if (!dev) 2401 goto err_exit; 2402 err = dev_open(dev); 2403 } 2404 } 2405 #endif 2406 2407 err_exit: 2408 rtnl_unlock(); 2409 return err; 2410 } 2411 2412 /* 2413 * Manual configuration of address on an interface 2414 */ 2415 static int inet6_addr_add(struct net *net, int ifindex, const struct in6_addr *pfx, 2416 const struct in6_addr *peer_pfx, 2417 unsigned int plen, __u8 ifa_flags, __u32 prefered_lft, 2418 __u32 valid_lft) 2419 { 2420 struct inet6_ifaddr *ifp; 2421 struct inet6_dev *idev; 2422 struct net_device *dev; 2423 int scope; 2424 u32 flags; 2425 clock_t expires; 2426 unsigned long timeout; 2427 2428 ASSERT_RTNL(); 2429 2430 if (plen > 128) 2431 return -EINVAL; 2432 2433 /* check the lifetime */ 2434 if (!valid_lft || prefered_lft > valid_lft) 2435 return -EINVAL; 2436 2437 dev = __dev_get_by_index(net, ifindex); 2438 if (!dev) 2439 return -ENODEV; 2440 2441 idev = addrconf_add_dev(dev); 2442 if (IS_ERR(idev)) 2443 return PTR_ERR(idev); 2444 2445 scope = ipv6_addr_scope(pfx); 2446 2447 timeout = addrconf_timeout_fixup(valid_lft, HZ); 2448 if (addrconf_finite_timeout(timeout)) { 2449 expires = jiffies_to_clock_t(timeout * HZ); 2450 valid_lft = timeout; 2451 flags = RTF_EXPIRES; 2452 } else { 2453 expires = 0; 2454 flags = 0; 2455 ifa_flags |= IFA_F_PERMANENT; 2456 } 2457 2458 timeout = addrconf_timeout_fixup(prefered_lft, HZ); 2459 if (addrconf_finite_timeout(timeout)) { 2460 if (timeout == 0) 2461 ifa_flags |= IFA_F_DEPRECATED; 2462 prefered_lft = timeout; 2463 } 2464 2465 ifp = ipv6_add_addr(idev, pfx, peer_pfx, plen, scope, ifa_flags, 2466 valid_lft, prefered_lft); 2467 2468 if (!IS_ERR(ifp)) { 2469 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev, 2470 expires, flags); 2471 /* 2472 * Note that section 3.1 of RFC 4429 indicates 2473 * that the Optimistic flag should not be set for 2474 * manually configured addresses 2475 */ 2476 addrconf_dad_start(ifp); 2477 in6_ifa_put(ifp); 2478 addrconf_verify(0); 2479 return 0; 2480 } 2481 2482 return PTR_ERR(ifp); 2483 } 2484 2485 static int inet6_addr_del(struct net *net, int ifindex, const struct in6_addr *pfx, 2486 unsigned int plen) 2487 { 2488 struct inet6_ifaddr *ifp; 2489 struct inet6_dev *idev; 2490 struct net_device *dev; 2491 2492 if (plen > 128) 2493 return -EINVAL; 2494 2495 dev = __dev_get_by_index(net, ifindex); 2496 if (!dev) 2497 return -ENODEV; 2498 2499 if ((idev = __in6_dev_get(dev)) == NULL) 2500 return -ENXIO; 2501 2502 read_lock_bh(&idev->lock); 2503 list_for_each_entry(ifp, &idev->addr_list, if_list) { 2504 if (ifp->prefix_len == plen && 2505 ipv6_addr_equal(pfx, &ifp->addr)) { 2506 in6_ifa_hold(ifp); 2507 read_unlock_bh(&idev->lock); 2508 2509 ipv6_del_addr(ifp); 2510 return 0; 2511 } 2512 } 2513 read_unlock_bh(&idev->lock); 2514 return -EADDRNOTAVAIL; 2515 } 2516 2517 2518 int addrconf_add_ifaddr(struct net *net, void __user *arg) 2519 { 2520 struct in6_ifreq ireq; 2521 int err; 2522 2523 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 2524 return -EPERM; 2525 2526 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2527 return -EFAULT; 2528 2529 rtnl_lock(); 2530 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, NULL, 2531 ireq.ifr6_prefixlen, IFA_F_PERMANENT, 2532 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME); 2533 rtnl_unlock(); 2534 return err; 2535 } 2536 2537 int addrconf_del_ifaddr(struct net *net, void __user *arg) 2538 { 2539 struct in6_ifreq ireq; 2540 int err; 2541 2542 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 2543 return -EPERM; 2544 2545 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2546 return -EFAULT; 2547 2548 rtnl_lock(); 2549 err = inet6_addr_del(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, 2550 ireq.ifr6_prefixlen); 2551 rtnl_unlock(); 2552 return err; 2553 } 2554 2555 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr, 2556 int plen, int scope) 2557 { 2558 struct inet6_ifaddr *ifp; 2559 2560 ifp = ipv6_add_addr(idev, addr, NULL, plen, 2561 scope, IFA_F_PERMANENT, 0, 0); 2562 if (!IS_ERR(ifp)) { 2563 spin_lock_bh(&ifp->lock); 2564 ifp->flags &= ~IFA_F_TENTATIVE; 2565 spin_unlock_bh(&ifp->lock); 2566 ipv6_ifa_notify(RTM_NEWADDR, ifp); 2567 in6_ifa_put(ifp); 2568 } 2569 } 2570 2571 #if IS_ENABLED(CONFIG_IPV6_SIT) 2572 static void sit_add_v4_addrs(struct inet6_dev *idev) 2573 { 2574 struct in6_addr addr; 2575 struct net_device *dev; 2576 struct net *net = dev_net(idev->dev); 2577 int scope; 2578 2579 ASSERT_RTNL(); 2580 2581 memset(&addr, 0, sizeof(struct in6_addr)); 2582 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4); 2583 2584 if (idev->dev->flags&IFF_POINTOPOINT) { 2585 addr.s6_addr32[0] = htonl(0xfe800000); 2586 scope = IFA_LINK; 2587 } else { 2588 scope = IPV6_ADDR_COMPATv4; 2589 } 2590 2591 if (addr.s6_addr32[3]) { 2592 add_addr(idev, &addr, 128, scope); 2593 return; 2594 } 2595 2596 for_each_netdev(net, dev) { 2597 struct in_device *in_dev = __in_dev_get_rtnl(dev); 2598 if (in_dev && (dev->flags & IFF_UP)) { 2599 struct in_ifaddr *ifa; 2600 2601 int flag = scope; 2602 2603 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) { 2604 int plen; 2605 2606 addr.s6_addr32[3] = ifa->ifa_local; 2607 2608 if (ifa->ifa_scope == RT_SCOPE_LINK) 2609 continue; 2610 if (ifa->ifa_scope >= RT_SCOPE_HOST) { 2611 if (idev->dev->flags&IFF_POINTOPOINT) 2612 continue; 2613 flag |= IFA_HOST; 2614 } 2615 if (idev->dev->flags&IFF_POINTOPOINT) 2616 plen = 64; 2617 else 2618 plen = 96; 2619 2620 add_addr(idev, &addr, plen, flag); 2621 } 2622 } 2623 } 2624 } 2625 #endif 2626 2627 static void init_loopback(struct net_device *dev) 2628 { 2629 struct inet6_dev *idev; 2630 struct net_device *sp_dev; 2631 struct inet6_ifaddr *sp_ifa; 2632 struct rt6_info *sp_rt; 2633 2634 /* ::1 */ 2635 2636 ASSERT_RTNL(); 2637 2638 if ((idev = ipv6_find_idev(dev)) == NULL) { 2639 pr_debug("%s: add_dev failed\n", __func__); 2640 return; 2641 } 2642 2643 add_addr(idev, &in6addr_loopback, 128, IFA_HOST); 2644 2645 /* Add routes to other interface's IPv6 addresses */ 2646 for_each_netdev(dev_net(dev), sp_dev) { 2647 if (!strcmp(sp_dev->name, dev->name)) 2648 continue; 2649 2650 idev = __in6_dev_get(sp_dev); 2651 if (!idev) 2652 continue; 2653 2654 read_lock_bh(&idev->lock); 2655 list_for_each_entry(sp_ifa, &idev->addr_list, if_list) { 2656 2657 if (sp_ifa->flags & (IFA_F_DADFAILED | IFA_F_TENTATIVE)) 2658 continue; 2659 2660 if (sp_ifa->rt) 2661 continue; 2662 2663 sp_rt = addrconf_dst_alloc(idev, &sp_ifa->addr, 0); 2664 2665 /* Failure cases are ignored */ 2666 if (!IS_ERR(sp_rt)) { 2667 sp_ifa->rt = sp_rt; 2668 ip6_ins_rt(sp_rt); 2669 } 2670 } 2671 read_unlock_bh(&idev->lock); 2672 } 2673 } 2674 2675 static void addrconf_add_linklocal(struct inet6_dev *idev, const struct in6_addr *addr) 2676 { 2677 struct inet6_ifaddr *ifp; 2678 u32 addr_flags = IFA_F_PERMANENT; 2679 2680 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 2681 if (idev->cnf.optimistic_dad && 2682 !dev_net(idev->dev)->ipv6.devconf_all->forwarding) 2683 addr_flags |= IFA_F_OPTIMISTIC; 2684 #endif 2685 2686 2687 ifp = ipv6_add_addr(idev, addr, NULL, 64, IFA_LINK, addr_flags, 0, 0); 2688 if (!IS_ERR(ifp)) { 2689 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0); 2690 addrconf_dad_start(ifp); 2691 in6_ifa_put(ifp); 2692 } 2693 } 2694 2695 static void addrconf_dev_config(struct net_device *dev) 2696 { 2697 struct in6_addr addr; 2698 struct inet6_dev *idev; 2699 2700 ASSERT_RTNL(); 2701 2702 if ((dev->type != ARPHRD_ETHER) && 2703 (dev->type != ARPHRD_FDDI) && 2704 (dev->type != ARPHRD_ARCNET) && 2705 (dev->type != ARPHRD_INFINIBAND) && 2706 (dev->type != ARPHRD_IEEE802154) && 2707 (dev->type != ARPHRD_IEEE1394)) { 2708 /* Alas, we support only Ethernet autoconfiguration. */ 2709 return; 2710 } 2711 2712 idev = addrconf_add_dev(dev); 2713 if (IS_ERR(idev)) 2714 return; 2715 2716 memset(&addr, 0, sizeof(struct in6_addr)); 2717 addr.s6_addr32[0] = htonl(0xFE800000); 2718 2719 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0) 2720 addrconf_add_linklocal(idev, &addr); 2721 } 2722 2723 #if IS_ENABLED(CONFIG_IPV6_SIT) 2724 static void addrconf_sit_config(struct net_device *dev) 2725 { 2726 struct inet6_dev *idev; 2727 2728 ASSERT_RTNL(); 2729 2730 /* 2731 * Configure the tunnel with one of our IPv4 2732 * addresses... we should configure all of 2733 * our v4 addrs in the tunnel 2734 */ 2735 2736 if ((idev = ipv6_find_idev(dev)) == NULL) { 2737 pr_debug("%s: add_dev failed\n", __func__); 2738 return; 2739 } 2740 2741 if (dev->priv_flags & IFF_ISATAP) { 2742 struct in6_addr addr; 2743 2744 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0); 2745 addrconf_prefix_route(&addr, 64, dev, 0, 0); 2746 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev)) 2747 addrconf_add_linklocal(idev, &addr); 2748 return; 2749 } 2750 2751 sit_add_v4_addrs(idev); 2752 2753 if (dev->flags&IFF_POINTOPOINT) 2754 addrconf_add_mroute(dev); 2755 else 2756 sit_route_add(dev); 2757 } 2758 #endif 2759 2760 #if IS_ENABLED(CONFIG_NET_IPGRE) 2761 static void addrconf_gre_config(struct net_device *dev) 2762 { 2763 struct inet6_dev *idev; 2764 struct in6_addr addr; 2765 2766 ASSERT_RTNL(); 2767 2768 if ((idev = ipv6_find_idev(dev)) == NULL) { 2769 pr_debug("%s: add_dev failed\n", __func__); 2770 return; 2771 } 2772 2773 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0); 2774 addrconf_prefix_route(&addr, 64, dev, 0, 0); 2775 2776 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev)) 2777 addrconf_add_linklocal(idev, &addr); 2778 } 2779 #endif 2780 2781 static inline int 2782 ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev) 2783 { 2784 struct in6_addr lladdr; 2785 2786 if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) { 2787 addrconf_add_linklocal(idev, &lladdr); 2788 return 0; 2789 } 2790 return -1; 2791 } 2792 2793 static void ip6_tnl_add_linklocal(struct inet6_dev *idev) 2794 { 2795 struct net_device *link_dev; 2796 struct net *net = dev_net(idev->dev); 2797 2798 /* first try to inherit the link-local address from the link device */ 2799 if (idev->dev->iflink && 2800 (link_dev = __dev_get_by_index(net, idev->dev->iflink))) { 2801 if (!ipv6_inherit_linklocal(idev, link_dev)) 2802 return; 2803 } 2804 /* then try to inherit it from any device */ 2805 for_each_netdev(net, link_dev) { 2806 if (!ipv6_inherit_linklocal(idev, link_dev)) 2807 return; 2808 } 2809 pr_debug("init ip6-ip6: add_linklocal failed\n"); 2810 } 2811 2812 /* 2813 * Autoconfigure tunnel with a link-local address so routing protocols, 2814 * DHCPv6, MLD etc. can be run over the virtual link 2815 */ 2816 2817 static void addrconf_ip6_tnl_config(struct net_device *dev) 2818 { 2819 struct inet6_dev *idev; 2820 2821 ASSERT_RTNL(); 2822 2823 idev = addrconf_add_dev(dev); 2824 if (IS_ERR(idev)) { 2825 pr_debug("init ip6-ip6: add_dev failed\n"); 2826 return; 2827 } 2828 ip6_tnl_add_linklocal(idev); 2829 } 2830 2831 static int addrconf_notify(struct notifier_block *this, unsigned long event, 2832 void *ptr) 2833 { 2834 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 2835 struct inet6_dev *idev = __in6_dev_get(dev); 2836 int run_pending = 0; 2837 int err; 2838 2839 switch (event) { 2840 case NETDEV_REGISTER: 2841 if (!idev && dev->mtu >= IPV6_MIN_MTU) { 2842 idev = ipv6_add_dev(dev); 2843 if (!idev) 2844 return notifier_from_errno(-ENOMEM); 2845 } 2846 break; 2847 2848 case NETDEV_UP: 2849 case NETDEV_CHANGE: 2850 if (dev->flags & IFF_SLAVE) 2851 break; 2852 2853 if (event == NETDEV_UP) { 2854 if (!addrconf_qdisc_ok(dev)) { 2855 /* device is not ready yet. */ 2856 pr_info("ADDRCONF(NETDEV_UP): %s: link is not ready\n", 2857 dev->name); 2858 break; 2859 } 2860 2861 if (!idev && dev->mtu >= IPV6_MIN_MTU) 2862 idev = ipv6_add_dev(dev); 2863 2864 if (idev) { 2865 idev->if_flags |= IF_READY; 2866 run_pending = 1; 2867 } 2868 } else { 2869 if (!addrconf_qdisc_ok(dev)) { 2870 /* device is still not ready. */ 2871 break; 2872 } 2873 2874 if (idev) { 2875 if (idev->if_flags & IF_READY) 2876 /* device is already configured. */ 2877 break; 2878 idev->if_flags |= IF_READY; 2879 } 2880 2881 pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n", 2882 dev->name); 2883 2884 run_pending = 1; 2885 } 2886 2887 switch (dev->type) { 2888 #if IS_ENABLED(CONFIG_IPV6_SIT) 2889 case ARPHRD_SIT: 2890 addrconf_sit_config(dev); 2891 break; 2892 #endif 2893 #if IS_ENABLED(CONFIG_NET_IPGRE) 2894 case ARPHRD_IPGRE: 2895 addrconf_gre_config(dev); 2896 break; 2897 #endif 2898 case ARPHRD_TUNNEL6: 2899 addrconf_ip6_tnl_config(dev); 2900 break; 2901 case ARPHRD_LOOPBACK: 2902 init_loopback(dev); 2903 break; 2904 2905 default: 2906 addrconf_dev_config(dev); 2907 break; 2908 } 2909 2910 if (idev) { 2911 if (run_pending) 2912 addrconf_dad_run(idev); 2913 2914 /* 2915 * If the MTU changed during the interface down, 2916 * when the interface up, the changed MTU must be 2917 * reflected in the idev as well as routers. 2918 */ 2919 if (idev->cnf.mtu6 != dev->mtu && 2920 dev->mtu >= IPV6_MIN_MTU) { 2921 rt6_mtu_change(dev, dev->mtu); 2922 idev->cnf.mtu6 = dev->mtu; 2923 } 2924 idev->tstamp = jiffies; 2925 inet6_ifinfo_notify(RTM_NEWLINK, idev); 2926 2927 /* 2928 * If the changed mtu during down is lower than 2929 * IPV6_MIN_MTU stop IPv6 on this interface. 2930 */ 2931 if (dev->mtu < IPV6_MIN_MTU) 2932 addrconf_ifdown(dev, 1); 2933 } 2934 break; 2935 2936 case NETDEV_CHANGEMTU: 2937 if (idev && dev->mtu >= IPV6_MIN_MTU) { 2938 rt6_mtu_change(dev, dev->mtu); 2939 idev->cnf.mtu6 = dev->mtu; 2940 break; 2941 } 2942 2943 if (!idev && dev->mtu >= IPV6_MIN_MTU) { 2944 idev = ipv6_add_dev(dev); 2945 if (idev) 2946 break; 2947 } 2948 2949 /* 2950 * MTU falled under IPV6_MIN_MTU. 2951 * Stop IPv6 on this interface. 2952 */ 2953 2954 case NETDEV_DOWN: 2955 case NETDEV_UNREGISTER: 2956 /* 2957 * Remove all addresses from this interface. 2958 */ 2959 addrconf_ifdown(dev, event != NETDEV_DOWN); 2960 break; 2961 2962 case NETDEV_CHANGENAME: 2963 if (idev) { 2964 snmp6_unregister_dev(idev); 2965 addrconf_sysctl_unregister(idev); 2966 addrconf_sysctl_register(idev); 2967 err = snmp6_register_dev(idev); 2968 if (err) 2969 return notifier_from_errno(err); 2970 } 2971 break; 2972 2973 case NETDEV_PRE_TYPE_CHANGE: 2974 case NETDEV_POST_TYPE_CHANGE: 2975 addrconf_type_change(dev, event); 2976 break; 2977 } 2978 2979 return NOTIFY_OK; 2980 } 2981 2982 /* 2983 * addrconf module should be notified of a device going up 2984 */ 2985 static struct notifier_block ipv6_dev_notf = { 2986 .notifier_call = addrconf_notify, 2987 }; 2988 2989 static void addrconf_type_change(struct net_device *dev, unsigned long event) 2990 { 2991 struct inet6_dev *idev; 2992 ASSERT_RTNL(); 2993 2994 idev = __in6_dev_get(dev); 2995 2996 if (event == NETDEV_POST_TYPE_CHANGE) 2997 ipv6_mc_remap(idev); 2998 else if (event == NETDEV_PRE_TYPE_CHANGE) 2999 ipv6_mc_unmap(idev); 3000 } 3001 3002 static int addrconf_ifdown(struct net_device *dev, int how) 3003 { 3004 struct net *net = dev_net(dev); 3005 struct inet6_dev *idev; 3006 struct inet6_ifaddr *ifa; 3007 int state, i; 3008 3009 ASSERT_RTNL(); 3010 3011 rt6_ifdown(net, dev); 3012 neigh_ifdown(&nd_tbl, dev); 3013 3014 idev = __in6_dev_get(dev); 3015 if (idev == NULL) 3016 return -ENODEV; 3017 3018 /* 3019 * Step 1: remove reference to ipv6 device from parent device. 3020 * Do not dev_put! 3021 */ 3022 if (how) { 3023 idev->dead = 1; 3024 3025 /* protected by rtnl_lock */ 3026 RCU_INIT_POINTER(dev->ip6_ptr, NULL); 3027 3028 /* Step 1.5: remove snmp6 entry */ 3029 snmp6_unregister_dev(idev); 3030 3031 } 3032 3033 /* Step 2: clear hash table */ 3034 for (i = 0; i < IN6_ADDR_HSIZE; i++) { 3035 struct hlist_head *h = &inet6_addr_lst[i]; 3036 3037 spin_lock_bh(&addrconf_hash_lock); 3038 restart: 3039 hlist_for_each_entry_rcu(ifa, h, addr_lst) { 3040 if (ifa->idev == idev) { 3041 hlist_del_init_rcu(&ifa->addr_lst); 3042 addrconf_del_dad_timer(ifa); 3043 goto restart; 3044 } 3045 } 3046 spin_unlock_bh(&addrconf_hash_lock); 3047 } 3048 3049 write_lock_bh(&idev->lock); 3050 3051 addrconf_del_rs_timer(idev); 3052 3053 /* Step 2: clear flags for stateless addrconf */ 3054 if (!how) 3055 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY); 3056 3057 #ifdef CONFIG_IPV6_PRIVACY 3058 if (how && del_timer(&idev->regen_timer)) 3059 in6_dev_put(idev); 3060 3061 /* Step 3: clear tempaddr list */ 3062 while (!list_empty(&idev->tempaddr_list)) { 3063 ifa = list_first_entry(&idev->tempaddr_list, 3064 struct inet6_ifaddr, tmp_list); 3065 list_del(&ifa->tmp_list); 3066 write_unlock_bh(&idev->lock); 3067 spin_lock_bh(&ifa->lock); 3068 3069 if (ifa->ifpub) { 3070 in6_ifa_put(ifa->ifpub); 3071 ifa->ifpub = NULL; 3072 } 3073 spin_unlock_bh(&ifa->lock); 3074 in6_ifa_put(ifa); 3075 write_lock_bh(&idev->lock); 3076 } 3077 #endif 3078 3079 while (!list_empty(&idev->addr_list)) { 3080 ifa = list_first_entry(&idev->addr_list, 3081 struct inet6_ifaddr, if_list); 3082 addrconf_del_dad_timer(ifa); 3083 3084 list_del(&ifa->if_list); 3085 3086 write_unlock_bh(&idev->lock); 3087 3088 spin_lock_bh(&ifa->state_lock); 3089 state = ifa->state; 3090 ifa->state = INET6_IFADDR_STATE_DEAD; 3091 spin_unlock_bh(&ifa->state_lock); 3092 3093 if (state != INET6_IFADDR_STATE_DEAD) { 3094 __ipv6_ifa_notify(RTM_DELADDR, ifa); 3095 inet6addr_notifier_call_chain(NETDEV_DOWN, ifa); 3096 } 3097 in6_ifa_put(ifa); 3098 3099 write_lock_bh(&idev->lock); 3100 } 3101 3102 write_unlock_bh(&idev->lock); 3103 3104 /* Step 5: Discard multicast list */ 3105 if (how) 3106 ipv6_mc_destroy_dev(idev); 3107 else 3108 ipv6_mc_down(idev); 3109 3110 idev->tstamp = jiffies; 3111 3112 /* Last: Shot the device (if unregistered) */ 3113 if (how) { 3114 addrconf_sysctl_unregister(idev); 3115 neigh_parms_release(&nd_tbl, idev->nd_parms); 3116 neigh_ifdown(&nd_tbl, dev); 3117 in6_dev_put(idev); 3118 } 3119 return 0; 3120 } 3121 3122 static void addrconf_rs_timer(unsigned long data) 3123 { 3124 struct inet6_dev *idev = (struct inet6_dev *)data; 3125 struct in6_addr lladdr; 3126 3127 write_lock(&idev->lock); 3128 if (idev->dead || !(idev->if_flags & IF_READY)) 3129 goto out; 3130 3131 if (!ipv6_accept_ra(idev)) 3132 goto out; 3133 3134 /* Announcement received after solicitation was sent */ 3135 if (idev->if_flags & IF_RA_RCVD) 3136 goto out; 3137 3138 if (idev->rs_probes++ < idev->cnf.rtr_solicits) { 3139 if (!__ipv6_get_lladdr(idev, &lladdr, IFA_F_TENTATIVE)) 3140 ndisc_send_rs(idev->dev, &lladdr, 3141 &in6addr_linklocal_allrouters); 3142 else 3143 goto out; 3144 3145 /* The wait after the last probe can be shorter */ 3146 addrconf_mod_rs_timer(idev, (idev->rs_probes == 3147 idev->cnf.rtr_solicits) ? 3148 idev->cnf.rtr_solicit_delay : 3149 idev->cnf.rtr_solicit_interval); 3150 } else { 3151 /* 3152 * Note: we do not support deprecated "all on-link" 3153 * assumption any longer. 3154 */ 3155 pr_debug("%s: no IPv6 routers present\n", idev->dev->name); 3156 } 3157 3158 out: 3159 write_unlock(&idev->lock); 3160 in6_dev_put(idev); 3161 } 3162 3163 /* 3164 * Duplicate Address Detection 3165 */ 3166 static void addrconf_dad_kick(struct inet6_ifaddr *ifp) 3167 { 3168 unsigned long rand_num; 3169 struct inet6_dev *idev = ifp->idev; 3170 3171 if (ifp->flags & IFA_F_OPTIMISTIC) 3172 rand_num = 0; 3173 else 3174 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1); 3175 3176 ifp->dad_probes = idev->cnf.dad_transmits; 3177 addrconf_mod_dad_timer(ifp, rand_num); 3178 } 3179 3180 static void addrconf_dad_start(struct inet6_ifaddr *ifp) 3181 { 3182 struct inet6_dev *idev = ifp->idev; 3183 struct net_device *dev = idev->dev; 3184 3185 addrconf_join_solict(dev, &ifp->addr); 3186 3187 net_srandom(ifp->addr.s6_addr32[3]); 3188 3189 read_lock_bh(&idev->lock); 3190 spin_lock(&ifp->lock); 3191 if (ifp->state == INET6_IFADDR_STATE_DEAD) 3192 goto out; 3193 3194 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) || 3195 idev->cnf.accept_dad < 1 || 3196 !(ifp->flags&IFA_F_TENTATIVE) || 3197 ifp->flags & IFA_F_NODAD) { 3198 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED); 3199 spin_unlock(&ifp->lock); 3200 read_unlock_bh(&idev->lock); 3201 3202 addrconf_dad_completed(ifp); 3203 return; 3204 } 3205 3206 if (!(idev->if_flags & IF_READY)) { 3207 spin_unlock(&ifp->lock); 3208 read_unlock_bh(&idev->lock); 3209 /* 3210 * If the device is not ready: 3211 * - keep it tentative if it is a permanent address. 3212 * - otherwise, kill it. 3213 */ 3214 in6_ifa_hold(ifp); 3215 addrconf_dad_stop(ifp, 0); 3216 return; 3217 } 3218 3219 /* 3220 * Optimistic nodes can start receiving 3221 * Frames right away 3222 */ 3223 if (ifp->flags & IFA_F_OPTIMISTIC) 3224 ip6_ins_rt(ifp->rt); 3225 3226 addrconf_dad_kick(ifp); 3227 out: 3228 spin_unlock(&ifp->lock); 3229 read_unlock_bh(&idev->lock); 3230 } 3231 3232 static void addrconf_dad_timer(unsigned long data) 3233 { 3234 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data; 3235 struct inet6_dev *idev = ifp->idev; 3236 struct in6_addr mcaddr; 3237 3238 if (!ifp->dad_probes && addrconf_dad_end(ifp)) 3239 goto out; 3240 3241 write_lock(&idev->lock); 3242 if (idev->dead || !(idev->if_flags & IF_READY)) { 3243 write_unlock(&idev->lock); 3244 goto out; 3245 } 3246 3247 spin_lock(&ifp->lock); 3248 if (ifp->state == INET6_IFADDR_STATE_DEAD) { 3249 spin_unlock(&ifp->lock); 3250 write_unlock(&idev->lock); 3251 goto out; 3252 } 3253 3254 if (ifp->dad_probes == 0) { 3255 /* 3256 * DAD was successful 3257 */ 3258 3259 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED); 3260 spin_unlock(&ifp->lock); 3261 write_unlock(&idev->lock); 3262 3263 addrconf_dad_completed(ifp); 3264 3265 goto out; 3266 } 3267 3268 ifp->dad_probes--; 3269 addrconf_mod_dad_timer(ifp, ifp->idev->nd_parms->retrans_time); 3270 spin_unlock(&ifp->lock); 3271 write_unlock(&idev->lock); 3272 3273 /* send a neighbour solicitation for our addr */ 3274 addrconf_addr_solict_mult(&ifp->addr, &mcaddr); 3275 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &in6addr_any); 3276 out: 3277 in6_ifa_put(ifp); 3278 } 3279 3280 static void addrconf_dad_completed(struct inet6_ifaddr *ifp) 3281 { 3282 struct net_device *dev = ifp->idev->dev; 3283 struct in6_addr lladdr; 3284 bool send_rs, send_mld; 3285 3286 addrconf_del_dad_timer(ifp); 3287 3288 /* 3289 * Configure the address for reception. Now it is valid. 3290 */ 3291 3292 ipv6_ifa_notify(RTM_NEWADDR, ifp); 3293 3294 /* If added prefix is link local and we are prepared to process 3295 router advertisements, start sending router solicitations. 3296 */ 3297 3298 read_lock_bh(&ifp->idev->lock); 3299 spin_lock(&ifp->lock); 3300 send_mld = ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL && 3301 ifp->idev->valid_ll_addr_cnt == 1; 3302 send_rs = send_mld && 3303 ipv6_accept_ra(ifp->idev) && 3304 ifp->idev->cnf.rtr_solicits > 0 && 3305 (dev->flags&IFF_LOOPBACK) == 0; 3306 spin_unlock(&ifp->lock); 3307 read_unlock_bh(&ifp->idev->lock); 3308 3309 /* While dad is in progress mld report's source address is in6_addrany. 3310 * Resend with proper ll now. 3311 */ 3312 if (send_mld) 3313 ipv6_mc_dad_complete(ifp->idev); 3314 3315 if (send_rs) { 3316 /* 3317 * If a host as already performed a random delay 3318 * [...] as part of DAD [...] there is no need 3319 * to delay again before sending the first RS 3320 */ 3321 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE)) 3322 return; 3323 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters); 3324 3325 write_lock_bh(&ifp->idev->lock); 3326 spin_lock(&ifp->lock); 3327 ifp->idev->rs_probes = 1; 3328 ifp->idev->if_flags |= IF_RS_SENT; 3329 addrconf_mod_rs_timer(ifp->idev, 3330 ifp->idev->cnf.rtr_solicit_interval); 3331 spin_unlock(&ifp->lock); 3332 write_unlock_bh(&ifp->idev->lock); 3333 } 3334 } 3335 3336 static void addrconf_dad_run(struct inet6_dev *idev) 3337 { 3338 struct inet6_ifaddr *ifp; 3339 3340 read_lock_bh(&idev->lock); 3341 list_for_each_entry(ifp, &idev->addr_list, if_list) { 3342 spin_lock(&ifp->lock); 3343 if (ifp->flags & IFA_F_TENTATIVE && 3344 ifp->state == INET6_IFADDR_STATE_DAD) 3345 addrconf_dad_kick(ifp); 3346 spin_unlock(&ifp->lock); 3347 } 3348 read_unlock_bh(&idev->lock); 3349 } 3350 3351 #ifdef CONFIG_PROC_FS 3352 struct if6_iter_state { 3353 struct seq_net_private p; 3354 int bucket; 3355 int offset; 3356 }; 3357 3358 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos) 3359 { 3360 struct inet6_ifaddr *ifa = NULL; 3361 struct if6_iter_state *state = seq->private; 3362 struct net *net = seq_file_net(seq); 3363 int p = 0; 3364 3365 /* initial bucket if pos is 0 */ 3366 if (pos == 0) { 3367 state->bucket = 0; 3368 state->offset = 0; 3369 } 3370 3371 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) { 3372 hlist_for_each_entry_rcu_bh(ifa, &inet6_addr_lst[state->bucket], 3373 addr_lst) { 3374 if (!net_eq(dev_net(ifa->idev->dev), net)) 3375 continue; 3376 /* sync with offset */ 3377 if (p < state->offset) { 3378 p++; 3379 continue; 3380 } 3381 state->offset++; 3382 return ifa; 3383 } 3384 3385 /* prepare for next bucket */ 3386 state->offset = 0; 3387 p = 0; 3388 } 3389 return NULL; 3390 } 3391 3392 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, 3393 struct inet6_ifaddr *ifa) 3394 { 3395 struct if6_iter_state *state = seq->private; 3396 struct net *net = seq_file_net(seq); 3397 3398 hlist_for_each_entry_continue_rcu_bh(ifa, addr_lst) { 3399 if (!net_eq(dev_net(ifa->idev->dev), net)) 3400 continue; 3401 state->offset++; 3402 return ifa; 3403 } 3404 3405 while (++state->bucket < IN6_ADDR_HSIZE) { 3406 state->offset = 0; 3407 hlist_for_each_entry_rcu_bh(ifa, 3408 &inet6_addr_lst[state->bucket], addr_lst) { 3409 if (!net_eq(dev_net(ifa->idev->dev), net)) 3410 continue; 3411 state->offset++; 3412 return ifa; 3413 } 3414 } 3415 3416 return NULL; 3417 } 3418 3419 static void *if6_seq_start(struct seq_file *seq, loff_t *pos) 3420 __acquires(rcu_bh) 3421 { 3422 rcu_read_lock_bh(); 3423 return if6_get_first(seq, *pos); 3424 } 3425 3426 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos) 3427 { 3428 struct inet6_ifaddr *ifa; 3429 3430 ifa = if6_get_next(seq, v); 3431 ++*pos; 3432 return ifa; 3433 } 3434 3435 static void if6_seq_stop(struct seq_file *seq, void *v) 3436 __releases(rcu_bh) 3437 { 3438 rcu_read_unlock_bh(); 3439 } 3440 3441 static int if6_seq_show(struct seq_file *seq, void *v) 3442 { 3443 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v; 3444 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n", 3445 &ifp->addr, 3446 ifp->idev->dev->ifindex, 3447 ifp->prefix_len, 3448 ifp->scope, 3449 ifp->flags, 3450 ifp->idev->dev->name); 3451 return 0; 3452 } 3453 3454 static const struct seq_operations if6_seq_ops = { 3455 .start = if6_seq_start, 3456 .next = if6_seq_next, 3457 .show = if6_seq_show, 3458 .stop = if6_seq_stop, 3459 }; 3460 3461 static int if6_seq_open(struct inode *inode, struct file *file) 3462 { 3463 return seq_open_net(inode, file, &if6_seq_ops, 3464 sizeof(struct if6_iter_state)); 3465 } 3466 3467 static const struct file_operations if6_fops = { 3468 .owner = THIS_MODULE, 3469 .open = if6_seq_open, 3470 .read = seq_read, 3471 .llseek = seq_lseek, 3472 .release = seq_release_net, 3473 }; 3474 3475 static int __net_init if6_proc_net_init(struct net *net) 3476 { 3477 if (!proc_create("if_inet6", S_IRUGO, net->proc_net, &if6_fops)) 3478 return -ENOMEM; 3479 return 0; 3480 } 3481 3482 static void __net_exit if6_proc_net_exit(struct net *net) 3483 { 3484 remove_proc_entry("if_inet6", net->proc_net); 3485 } 3486 3487 static struct pernet_operations if6_proc_net_ops = { 3488 .init = if6_proc_net_init, 3489 .exit = if6_proc_net_exit, 3490 }; 3491 3492 int __init if6_proc_init(void) 3493 { 3494 return register_pernet_subsys(&if6_proc_net_ops); 3495 } 3496 3497 void if6_proc_exit(void) 3498 { 3499 unregister_pernet_subsys(&if6_proc_net_ops); 3500 } 3501 #endif /* CONFIG_PROC_FS */ 3502 3503 #if IS_ENABLED(CONFIG_IPV6_MIP6) 3504 /* Check if address is a home address configured on any interface. */ 3505 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr) 3506 { 3507 int ret = 0; 3508 struct inet6_ifaddr *ifp = NULL; 3509 unsigned int hash = inet6_addr_hash(addr); 3510 3511 rcu_read_lock_bh(); 3512 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) { 3513 if (!net_eq(dev_net(ifp->idev->dev), net)) 3514 continue; 3515 if (ipv6_addr_equal(&ifp->addr, addr) && 3516 (ifp->flags & IFA_F_HOMEADDRESS)) { 3517 ret = 1; 3518 break; 3519 } 3520 } 3521 rcu_read_unlock_bh(); 3522 return ret; 3523 } 3524 #endif 3525 3526 /* 3527 * Periodic address status verification 3528 */ 3529 3530 static void addrconf_verify(unsigned long foo) 3531 { 3532 unsigned long now, next, next_sec, next_sched; 3533 struct inet6_ifaddr *ifp; 3534 int i; 3535 3536 rcu_read_lock_bh(); 3537 spin_lock(&addrconf_verify_lock); 3538 now = jiffies; 3539 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY); 3540 3541 del_timer(&addr_chk_timer); 3542 3543 for (i = 0; i < IN6_ADDR_HSIZE; i++) { 3544 restart: 3545 hlist_for_each_entry_rcu_bh(ifp, 3546 &inet6_addr_lst[i], addr_lst) { 3547 unsigned long age; 3548 3549 if (ifp->flags & IFA_F_PERMANENT) 3550 continue; 3551 3552 spin_lock(&ifp->lock); 3553 /* We try to batch several events at once. */ 3554 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ; 3555 3556 if (ifp->valid_lft != INFINITY_LIFE_TIME && 3557 age >= ifp->valid_lft) { 3558 spin_unlock(&ifp->lock); 3559 in6_ifa_hold(ifp); 3560 ipv6_del_addr(ifp); 3561 goto restart; 3562 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) { 3563 spin_unlock(&ifp->lock); 3564 continue; 3565 } else if (age >= ifp->prefered_lft) { 3566 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */ 3567 int deprecate = 0; 3568 3569 if (!(ifp->flags&IFA_F_DEPRECATED)) { 3570 deprecate = 1; 3571 ifp->flags |= IFA_F_DEPRECATED; 3572 } 3573 3574 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next)) 3575 next = ifp->tstamp + ifp->valid_lft * HZ; 3576 3577 spin_unlock(&ifp->lock); 3578 3579 if (deprecate) { 3580 in6_ifa_hold(ifp); 3581 3582 ipv6_ifa_notify(0, ifp); 3583 in6_ifa_put(ifp); 3584 goto restart; 3585 } 3586 #ifdef CONFIG_IPV6_PRIVACY 3587 } else if ((ifp->flags&IFA_F_TEMPORARY) && 3588 !(ifp->flags&IFA_F_TENTATIVE)) { 3589 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry * 3590 ifp->idev->cnf.dad_transmits * 3591 ifp->idev->nd_parms->retrans_time / HZ; 3592 3593 if (age >= ifp->prefered_lft - regen_advance) { 3594 struct inet6_ifaddr *ifpub = ifp->ifpub; 3595 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 3596 next = ifp->tstamp + ifp->prefered_lft * HZ; 3597 if (!ifp->regen_count && ifpub) { 3598 ifp->regen_count++; 3599 in6_ifa_hold(ifp); 3600 in6_ifa_hold(ifpub); 3601 spin_unlock(&ifp->lock); 3602 3603 spin_lock(&ifpub->lock); 3604 ifpub->regen_count = 0; 3605 spin_unlock(&ifpub->lock); 3606 ipv6_create_tempaddr(ifpub, ifp); 3607 in6_ifa_put(ifpub); 3608 in6_ifa_put(ifp); 3609 goto restart; 3610 } 3611 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next)) 3612 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ; 3613 spin_unlock(&ifp->lock); 3614 #endif 3615 } else { 3616 /* ifp->prefered_lft <= ifp->valid_lft */ 3617 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 3618 next = ifp->tstamp + ifp->prefered_lft * HZ; 3619 spin_unlock(&ifp->lock); 3620 } 3621 } 3622 } 3623 3624 next_sec = round_jiffies_up(next); 3625 next_sched = next; 3626 3627 /* If rounded timeout is accurate enough, accept it. */ 3628 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ)) 3629 next_sched = next_sec; 3630 3631 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */ 3632 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX)) 3633 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX; 3634 3635 ADBG((KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n", 3636 now, next, next_sec, next_sched)); 3637 3638 addr_chk_timer.expires = next_sched; 3639 add_timer(&addr_chk_timer); 3640 spin_unlock(&addrconf_verify_lock); 3641 rcu_read_unlock_bh(); 3642 } 3643 3644 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local, 3645 struct in6_addr **peer_pfx) 3646 { 3647 struct in6_addr *pfx = NULL; 3648 3649 *peer_pfx = NULL; 3650 3651 if (addr) 3652 pfx = nla_data(addr); 3653 3654 if (local) { 3655 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx))) 3656 *peer_pfx = pfx; 3657 pfx = nla_data(local); 3658 } 3659 3660 return pfx; 3661 } 3662 3663 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = { 3664 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) }, 3665 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) }, 3666 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) }, 3667 }; 3668 3669 static int 3670 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh) 3671 { 3672 struct net *net = sock_net(skb->sk); 3673 struct ifaddrmsg *ifm; 3674 struct nlattr *tb[IFA_MAX+1]; 3675 struct in6_addr *pfx, *peer_pfx; 3676 int err; 3677 3678 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy); 3679 if (err < 0) 3680 return err; 3681 3682 ifm = nlmsg_data(nlh); 3683 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx); 3684 if (pfx == NULL) 3685 return -EINVAL; 3686 3687 return inet6_addr_del(net, ifm->ifa_index, pfx, ifm->ifa_prefixlen); 3688 } 3689 3690 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags, 3691 u32 prefered_lft, u32 valid_lft) 3692 { 3693 u32 flags; 3694 clock_t expires; 3695 unsigned long timeout; 3696 3697 if (!valid_lft || (prefered_lft > valid_lft)) 3698 return -EINVAL; 3699 3700 timeout = addrconf_timeout_fixup(valid_lft, HZ); 3701 if (addrconf_finite_timeout(timeout)) { 3702 expires = jiffies_to_clock_t(timeout * HZ); 3703 valid_lft = timeout; 3704 flags = RTF_EXPIRES; 3705 } else { 3706 expires = 0; 3707 flags = 0; 3708 ifa_flags |= IFA_F_PERMANENT; 3709 } 3710 3711 timeout = addrconf_timeout_fixup(prefered_lft, HZ); 3712 if (addrconf_finite_timeout(timeout)) { 3713 if (timeout == 0) 3714 ifa_flags |= IFA_F_DEPRECATED; 3715 prefered_lft = timeout; 3716 } 3717 3718 spin_lock_bh(&ifp->lock); 3719 ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags; 3720 ifp->tstamp = jiffies; 3721 ifp->valid_lft = valid_lft; 3722 ifp->prefered_lft = prefered_lft; 3723 3724 spin_unlock_bh(&ifp->lock); 3725 if (!(ifp->flags&IFA_F_TENTATIVE)) 3726 ipv6_ifa_notify(0, ifp); 3727 3728 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev, 3729 expires, flags); 3730 addrconf_verify(0); 3731 3732 return 0; 3733 } 3734 3735 static int 3736 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh) 3737 { 3738 struct net *net = sock_net(skb->sk); 3739 struct ifaddrmsg *ifm; 3740 struct nlattr *tb[IFA_MAX+1]; 3741 struct in6_addr *pfx, *peer_pfx; 3742 struct inet6_ifaddr *ifa; 3743 struct net_device *dev; 3744 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME; 3745 u8 ifa_flags; 3746 int err; 3747 3748 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy); 3749 if (err < 0) 3750 return err; 3751 3752 ifm = nlmsg_data(nlh); 3753 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx); 3754 if (pfx == NULL) 3755 return -EINVAL; 3756 3757 if (tb[IFA_CACHEINFO]) { 3758 struct ifa_cacheinfo *ci; 3759 3760 ci = nla_data(tb[IFA_CACHEINFO]); 3761 valid_lft = ci->ifa_valid; 3762 preferred_lft = ci->ifa_prefered; 3763 } else { 3764 preferred_lft = INFINITY_LIFE_TIME; 3765 valid_lft = INFINITY_LIFE_TIME; 3766 } 3767 3768 dev = __dev_get_by_index(net, ifm->ifa_index); 3769 if (dev == NULL) 3770 return -ENODEV; 3771 3772 /* We ignore other flags so far. */ 3773 ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS); 3774 3775 ifa = ipv6_get_ifaddr(net, pfx, dev, 1); 3776 if (ifa == NULL) { 3777 /* 3778 * It would be best to check for !NLM_F_CREATE here but 3779 * userspace alreay relies on not having to provide this. 3780 */ 3781 return inet6_addr_add(net, ifm->ifa_index, pfx, peer_pfx, 3782 ifm->ifa_prefixlen, ifa_flags, 3783 preferred_lft, valid_lft); 3784 } 3785 3786 if (nlh->nlmsg_flags & NLM_F_EXCL || 3787 !(nlh->nlmsg_flags & NLM_F_REPLACE)) 3788 err = -EEXIST; 3789 else 3790 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft); 3791 3792 in6_ifa_put(ifa); 3793 3794 return err; 3795 } 3796 3797 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags, 3798 u8 scope, int ifindex) 3799 { 3800 struct ifaddrmsg *ifm; 3801 3802 ifm = nlmsg_data(nlh); 3803 ifm->ifa_family = AF_INET6; 3804 ifm->ifa_prefixlen = prefixlen; 3805 ifm->ifa_flags = flags; 3806 ifm->ifa_scope = scope; 3807 ifm->ifa_index = ifindex; 3808 } 3809 3810 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp, 3811 unsigned long tstamp, u32 preferred, u32 valid) 3812 { 3813 struct ifa_cacheinfo ci; 3814 3815 ci.cstamp = cstamp_delta(cstamp); 3816 ci.tstamp = cstamp_delta(tstamp); 3817 ci.ifa_prefered = preferred; 3818 ci.ifa_valid = valid; 3819 3820 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci); 3821 } 3822 3823 static inline int rt_scope(int ifa_scope) 3824 { 3825 if (ifa_scope & IFA_HOST) 3826 return RT_SCOPE_HOST; 3827 else if (ifa_scope & IFA_LINK) 3828 return RT_SCOPE_LINK; 3829 else if (ifa_scope & IFA_SITE) 3830 return RT_SCOPE_SITE; 3831 else 3832 return RT_SCOPE_UNIVERSE; 3833 } 3834 3835 static inline int inet6_ifaddr_msgsize(void) 3836 { 3837 return NLMSG_ALIGN(sizeof(struct ifaddrmsg)) 3838 + nla_total_size(16) /* IFA_LOCAL */ 3839 + nla_total_size(16) /* IFA_ADDRESS */ 3840 + nla_total_size(sizeof(struct ifa_cacheinfo)); 3841 } 3842 3843 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa, 3844 u32 portid, u32 seq, int event, unsigned int flags) 3845 { 3846 struct nlmsghdr *nlh; 3847 u32 preferred, valid; 3848 3849 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags); 3850 if (nlh == NULL) 3851 return -EMSGSIZE; 3852 3853 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope), 3854 ifa->idev->dev->ifindex); 3855 3856 if (!(ifa->flags&IFA_F_PERMANENT)) { 3857 preferred = ifa->prefered_lft; 3858 valid = ifa->valid_lft; 3859 if (preferred != INFINITY_LIFE_TIME) { 3860 long tval = (jiffies - ifa->tstamp)/HZ; 3861 if (preferred > tval) 3862 preferred -= tval; 3863 else 3864 preferred = 0; 3865 if (valid != INFINITY_LIFE_TIME) { 3866 if (valid > tval) 3867 valid -= tval; 3868 else 3869 valid = 0; 3870 } 3871 } 3872 } else { 3873 preferred = INFINITY_LIFE_TIME; 3874 valid = INFINITY_LIFE_TIME; 3875 } 3876 3877 if (!ipv6_addr_any(&ifa->peer_addr)) { 3878 if (nla_put(skb, IFA_LOCAL, 16, &ifa->addr) < 0 || 3879 nla_put(skb, IFA_ADDRESS, 16, &ifa->peer_addr) < 0) 3880 goto error; 3881 } else 3882 if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0) 3883 goto error; 3884 3885 if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) 3886 goto error; 3887 3888 return nlmsg_end(skb, nlh); 3889 3890 error: 3891 nlmsg_cancel(skb, nlh); 3892 return -EMSGSIZE; 3893 } 3894 3895 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca, 3896 u32 portid, u32 seq, int event, u16 flags) 3897 { 3898 struct nlmsghdr *nlh; 3899 u8 scope = RT_SCOPE_UNIVERSE; 3900 int ifindex = ifmca->idev->dev->ifindex; 3901 3902 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE) 3903 scope = RT_SCOPE_SITE; 3904 3905 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags); 3906 if (nlh == NULL) 3907 return -EMSGSIZE; 3908 3909 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 3910 if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 || 3911 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp, 3912 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 3913 nlmsg_cancel(skb, nlh); 3914 return -EMSGSIZE; 3915 } 3916 3917 return nlmsg_end(skb, nlh); 3918 } 3919 3920 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca, 3921 u32 portid, u32 seq, int event, unsigned int flags) 3922 { 3923 struct nlmsghdr *nlh; 3924 u8 scope = RT_SCOPE_UNIVERSE; 3925 int ifindex = ifaca->aca_idev->dev->ifindex; 3926 3927 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE) 3928 scope = RT_SCOPE_SITE; 3929 3930 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags); 3931 if (nlh == NULL) 3932 return -EMSGSIZE; 3933 3934 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 3935 if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 || 3936 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp, 3937 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 3938 nlmsg_cancel(skb, nlh); 3939 return -EMSGSIZE; 3940 } 3941 3942 return nlmsg_end(skb, nlh); 3943 } 3944 3945 enum addr_type_t { 3946 UNICAST_ADDR, 3947 MULTICAST_ADDR, 3948 ANYCAST_ADDR, 3949 }; 3950 3951 /* called with rcu_read_lock() */ 3952 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb, 3953 struct netlink_callback *cb, enum addr_type_t type, 3954 int s_ip_idx, int *p_ip_idx) 3955 { 3956 struct ifmcaddr6 *ifmca; 3957 struct ifacaddr6 *ifaca; 3958 int err = 1; 3959 int ip_idx = *p_ip_idx; 3960 3961 read_lock_bh(&idev->lock); 3962 switch (type) { 3963 case UNICAST_ADDR: { 3964 struct inet6_ifaddr *ifa; 3965 3966 /* unicast address incl. temp addr */ 3967 list_for_each_entry(ifa, &idev->addr_list, if_list) { 3968 if (++ip_idx < s_ip_idx) 3969 continue; 3970 err = inet6_fill_ifaddr(skb, ifa, 3971 NETLINK_CB(cb->skb).portid, 3972 cb->nlh->nlmsg_seq, 3973 RTM_NEWADDR, 3974 NLM_F_MULTI); 3975 if (err <= 0) 3976 break; 3977 nl_dump_check_consistent(cb, nlmsg_hdr(skb)); 3978 } 3979 break; 3980 } 3981 case MULTICAST_ADDR: 3982 /* multicast address */ 3983 for (ifmca = idev->mc_list; ifmca; 3984 ifmca = ifmca->next, ip_idx++) { 3985 if (ip_idx < s_ip_idx) 3986 continue; 3987 err = inet6_fill_ifmcaddr(skb, ifmca, 3988 NETLINK_CB(cb->skb).portid, 3989 cb->nlh->nlmsg_seq, 3990 RTM_GETMULTICAST, 3991 NLM_F_MULTI); 3992 if (err <= 0) 3993 break; 3994 } 3995 break; 3996 case ANYCAST_ADDR: 3997 /* anycast address */ 3998 for (ifaca = idev->ac_list; ifaca; 3999 ifaca = ifaca->aca_next, ip_idx++) { 4000 if (ip_idx < s_ip_idx) 4001 continue; 4002 err = inet6_fill_ifacaddr(skb, ifaca, 4003 NETLINK_CB(cb->skb).portid, 4004 cb->nlh->nlmsg_seq, 4005 RTM_GETANYCAST, 4006 NLM_F_MULTI); 4007 if (err <= 0) 4008 break; 4009 } 4010 break; 4011 default: 4012 break; 4013 } 4014 read_unlock_bh(&idev->lock); 4015 *p_ip_idx = ip_idx; 4016 return err; 4017 } 4018 4019 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb, 4020 enum addr_type_t type) 4021 { 4022 struct net *net = sock_net(skb->sk); 4023 int h, s_h; 4024 int idx, ip_idx; 4025 int s_idx, s_ip_idx; 4026 struct net_device *dev; 4027 struct inet6_dev *idev; 4028 struct hlist_head *head; 4029 4030 s_h = cb->args[0]; 4031 s_idx = idx = cb->args[1]; 4032 s_ip_idx = ip_idx = cb->args[2]; 4033 4034 rcu_read_lock(); 4035 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ net->dev_base_seq; 4036 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 4037 idx = 0; 4038 head = &net->dev_index_head[h]; 4039 hlist_for_each_entry_rcu(dev, head, index_hlist) { 4040 if (idx < s_idx) 4041 goto cont; 4042 if (h > s_h || idx > s_idx) 4043 s_ip_idx = 0; 4044 ip_idx = 0; 4045 idev = __in6_dev_get(dev); 4046 if (!idev) 4047 goto cont; 4048 4049 if (in6_dump_addrs(idev, skb, cb, type, 4050 s_ip_idx, &ip_idx) <= 0) 4051 goto done; 4052 cont: 4053 idx++; 4054 } 4055 } 4056 done: 4057 rcu_read_unlock(); 4058 cb->args[0] = h; 4059 cb->args[1] = idx; 4060 cb->args[2] = ip_idx; 4061 4062 return skb->len; 4063 } 4064 4065 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb) 4066 { 4067 enum addr_type_t type = UNICAST_ADDR; 4068 4069 return inet6_dump_addr(skb, cb, type); 4070 } 4071 4072 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb) 4073 { 4074 enum addr_type_t type = MULTICAST_ADDR; 4075 4076 return inet6_dump_addr(skb, cb, type); 4077 } 4078 4079 4080 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb) 4081 { 4082 enum addr_type_t type = ANYCAST_ADDR; 4083 4084 return inet6_dump_addr(skb, cb, type); 4085 } 4086 4087 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh) 4088 { 4089 struct net *net = sock_net(in_skb->sk); 4090 struct ifaddrmsg *ifm; 4091 struct nlattr *tb[IFA_MAX+1]; 4092 struct in6_addr *addr = NULL, *peer; 4093 struct net_device *dev = NULL; 4094 struct inet6_ifaddr *ifa; 4095 struct sk_buff *skb; 4096 int err; 4097 4098 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy); 4099 if (err < 0) 4100 goto errout; 4101 4102 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer); 4103 if (addr == NULL) { 4104 err = -EINVAL; 4105 goto errout; 4106 } 4107 4108 ifm = nlmsg_data(nlh); 4109 if (ifm->ifa_index) 4110 dev = __dev_get_by_index(net, ifm->ifa_index); 4111 4112 ifa = ipv6_get_ifaddr(net, addr, dev, 1); 4113 if (!ifa) { 4114 err = -EADDRNOTAVAIL; 4115 goto errout; 4116 } 4117 4118 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL); 4119 if (!skb) { 4120 err = -ENOBUFS; 4121 goto errout_ifa; 4122 } 4123 4124 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).portid, 4125 nlh->nlmsg_seq, RTM_NEWADDR, 0); 4126 if (err < 0) { 4127 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 4128 WARN_ON(err == -EMSGSIZE); 4129 kfree_skb(skb); 4130 goto errout_ifa; 4131 } 4132 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid); 4133 errout_ifa: 4134 in6_ifa_put(ifa); 4135 errout: 4136 return err; 4137 } 4138 4139 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa) 4140 { 4141 struct sk_buff *skb; 4142 struct net *net = dev_net(ifa->idev->dev); 4143 int err = -ENOBUFS; 4144 4145 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC); 4146 if (skb == NULL) 4147 goto errout; 4148 4149 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0); 4150 if (err < 0) { 4151 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 4152 WARN_ON(err == -EMSGSIZE); 4153 kfree_skb(skb); 4154 goto errout; 4155 } 4156 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC); 4157 return; 4158 errout: 4159 if (err < 0) 4160 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err); 4161 } 4162 4163 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf, 4164 __s32 *array, int bytes) 4165 { 4166 BUG_ON(bytes < (DEVCONF_MAX * 4)); 4167 4168 memset(array, 0, bytes); 4169 array[DEVCONF_FORWARDING] = cnf->forwarding; 4170 array[DEVCONF_HOPLIMIT] = cnf->hop_limit; 4171 array[DEVCONF_MTU6] = cnf->mtu6; 4172 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra; 4173 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects; 4174 array[DEVCONF_AUTOCONF] = cnf->autoconf; 4175 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits; 4176 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits; 4177 array[DEVCONF_RTR_SOLICIT_INTERVAL] = 4178 jiffies_to_msecs(cnf->rtr_solicit_interval); 4179 array[DEVCONF_RTR_SOLICIT_DELAY] = 4180 jiffies_to_msecs(cnf->rtr_solicit_delay); 4181 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version; 4182 #ifdef CONFIG_IPV6_PRIVACY 4183 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr; 4184 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft; 4185 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft; 4186 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry; 4187 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor; 4188 #endif 4189 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses; 4190 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr; 4191 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo; 4192 #ifdef CONFIG_IPV6_ROUTER_PREF 4193 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref; 4194 array[DEVCONF_RTR_PROBE_INTERVAL] = 4195 jiffies_to_msecs(cnf->rtr_probe_interval); 4196 #ifdef CONFIG_IPV6_ROUTE_INFO 4197 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen; 4198 #endif 4199 #endif 4200 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp; 4201 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route; 4202 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 4203 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad; 4204 #endif 4205 #ifdef CONFIG_IPV6_MROUTE 4206 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding; 4207 #endif 4208 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6; 4209 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad; 4210 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao; 4211 array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify; 4212 } 4213 4214 static inline size_t inet6_ifla6_size(void) 4215 { 4216 return nla_total_size(4) /* IFLA_INET6_FLAGS */ 4217 + nla_total_size(sizeof(struct ifla_cacheinfo)) 4218 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */ 4219 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */ 4220 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */ 4221 + nla_total_size(sizeof(struct in6_addr)); /* IFLA_INET6_TOKEN */ 4222 } 4223 4224 static inline size_t inet6_if_nlmsg_size(void) 4225 { 4226 return NLMSG_ALIGN(sizeof(struct ifinfomsg)) 4227 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */ 4228 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */ 4229 + nla_total_size(4) /* IFLA_MTU */ 4230 + nla_total_size(4) /* IFLA_LINK */ 4231 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */ 4232 } 4233 4234 static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib, 4235 int items, int bytes) 4236 { 4237 int i; 4238 int pad = bytes - sizeof(u64) * items; 4239 BUG_ON(pad < 0); 4240 4241 /* Use put_unaligned() because stats may not be aligned for u64. */ 4242 put_unaligned(items, &stats[0]); 4243 for (i = 1; i < items; i++) 4244 put_unaligned(atomic_long_read(&mib[i]), &stats[i]); 4245 4246 memset(&stats[items], 0, pad); 4247 } 4248 4249 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu **mib, 4250 int items, int bytes, size_t syncpoff) 4251 { 4252 int i; 4253 int pad = bytes - sizeof(u64) * items; 4254 BUG_ON(pad < 0); 4255 4256 /* Use put_unaligned() because stats may not be aligned for u64. */ 4257 put_unaligned(items, &stats[0]); 4258 for (i = 1; i < items; i++) 4259 put_unaligned(snmp_fold_field64(mib, i, syncpoff), &stats[i]); 4260 4261 memset(&stats[items], 0, pad); 4262 } 4263 4264 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype, 4265 int bytes) 4266 { 4267 switch (attrtype) { 4268 case IFLA_INET6_STATS: 4269 __snmp6_fill_stats64(stats, (void __percpu **)idev->stats.ipv6, 4270 IPSTATS_MIB_MAX, bytes, offsetof(struct ipstats_mib, syncp)); 4271 break; 4272 case IFLA_INET6_ICMP6STATS: 4273 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, ICMP6_MIB_MAX, bytes); 4274 break; 4275 } 4276 } 4277 4278 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev) 4279 { 4280 struct nlattr *nla; 4281 struct ifla_cacheinfo ci; 4282 4283 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags)) 4284 goto nla_put_failure; 4285 ci.max_reasm_len = IPV6_MAXPLEN; 4286 ci.tstamp = cstamp_delta(idev->tstamp); 4287 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time); 4288 ci.retrans_time = jiffies_to_msecs(idev->nd_parms->retrans_time); 4289 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci)) 4290 goto nla_put_failure; 4291 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32)); 4292 if (nla == NULL) 4293 goto nla_put_failure; 4294 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla)); 4295 4296 /* XXX - MC not implemented */ 4297 4298 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64)); 4299 if (nla == NULL) 4300 goto nla_put_failure; 4301 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla)); 4302 4303 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64)); 4304 if (nla == NULL) 4305 goto nla_put_failure; 4306 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla)); 4307 4308 nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr)); 4309 if (nla == NULL) 4310 goto nla_put_failure; 4311 read_lock_bh(&idev->lock); 4312 memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla)); 4313 read_unlock_bh(&idev->lock); 4314 4315 return 0; 4316 4317 nla_put_failure: 4318 return -EMSGSIZE; 4319 } 4320 4321 static size_t inet6_get_link_af_size(const struct net_device *dev) 4322 { 4323 if (!__in6_dev_get(dev)) 4324 return 0; 4325 4326 return inet6_ifla6_size(); 4327 } 4328 4329 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev) 4330 { 4331 struct inet6_dev *idev = __in6_dev_get(dev); 4332 4333 if (!idev) 4334 return -ENODATA; 4335 4336 if (inet6_fill_ifla6_attrs(skb, idev) < 0) 4337 return -EMSGSIZE; 4338 4339 return 0; 4340 } 4341 4342 static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token) 4343 { 4344 struct inet6_ifaddr *ifp; 4345 struct net_device *dev = idev->dev; 4346 bool update_rs = false; 4347 struct in6_addr ll_addr; 4348 4349 if (token == NULL) 4350 return -EINVAL; 4351 if (ipv6_addr_any(token)) 4352 return -EINVAL; 4353 if (dev->flags & (IFF_LOOPBACK | IFF_NOARP)) 4354 return -EINVAL; 4355 if (!ipv6_accept_ra(idev)) 4356 return -EINVAL; 4357 if (idev->cnf.rtr_solicits <= 0) 4358 return -EINVAL; 4359 4360 write_lock_bh(&idev->lock); 4361 4362 BUILD_BUG_ON(sizeof(token->s6_addr) != 16); 4363 memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8); 4364 4365 write_unlock_bh(&idev->lock); 4366 4367 if (!idev->dead && (idev->if_flags & IF_READY) && 4368 !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE | 4369 IFA_F_OPTIMISTIC)) { 4370 4371 /* If we're not ready, then normal ifup will take care 4372 * of this. Otherwise, we need to request our rs here. 4373 */ 4374 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters); 4375 update_rs = true; 4376 } 4377 4378 write_lock_bh(&idev->lock); 4379 4380 if (update_rs) { 4381 idev->if_flags |= IF_RS_SENT; 4382 idev->rs_probes = 1; 4383 addrconf_mod_rs_timer(idev, idev->cnf.rtr_solicit_interval); 4384 } 4385 4386 /* Well, that's kinda nasty ... */ 4387 list_for_each_entry(ifp, &idev->addr_list, if_list) { 4388 spin_lock(&ifp->lock); 4389 if (ifp->tokenized) { 4390 ifp->valid_lft = 0; 4391 ifp->prefered_lft = 0; 4392 } 4393 spin_unlock(&ifp->lock); 4394 } 4395 4396 write_unlock_bh(&idev->lock); 4397 addrconf_verify(0); 4398 return 0; 4399 } 4400 4401 static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla) 4402 { 4403 int err = -EINVAL; 4404 struct inet6_dev *idev = __in6_dev_get(dev); 4405 struct nlattr *tb[IFLA_INET6_MAX + 1]; 4406 4407 if (!idev) 4408 return -EAFNOSUPPORT; 4409 4410 if (nla_parse_nested(tb, IFLA_INET6_MAX, nla, NULL) < 0) 4411 BUG(); 4412 4413 if (tb[IFLA_INET6_TOKEN]) 4414 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN])); 4415 4416 return err; 4417 } 4418 4419 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev, 4420 u32 portid, u32 seq, int event, unsigned int flags) 4421 { 4422 struct net_device *dev = idev->dev; 4423 struct ifinfomsg *hdr; 4424 struct nlmsghdr *nlh; 4425 void *protoinfo; 4426 4427 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags); 4428 if (nlh == NULL) 4429 return -EMSGSIZE; 4430 4431 hdr = nlmsg_data(nlh); 4432 hdr->ifi_family = AF_INET6; 4433 hdr->__ifi_pad = 0; 4434 hdr->ifi_type = dev->type; 4435 hdr->ifi_index = dev->ifindex; 4436 hdr->ifi_flags = dev_get_flags(dev); 4437 hdr->ifi_change = 0; 4438 4439 if (nla_put_string(skb, IFLA_IFNAME, dev->name) || 4440 (dev->addr_len && 4441 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) || 4442 nla_put_u32(skb, IFLA_MTU, dev->mtu) || 4443 (dev->ifindex != dev->iflink && 4444 nla_put_u32(skb, IFLA_LINK, dev->iflink))) 4445 goto nla_put_failure; 4446 protoinfo = nla_nest_start(skb, IFLA_PROTINFO); 4447 if (protoinfo == NULL) 4448 goto nla_put_failure; 4449 4450 if (inet6_fill_ifla6_attrs(skb, idev) < 0) 4451 goto nla_put_failure; 4452 4453 nla_nest_end(skb, protoinfo); 4454 return nlmsg_end(skb, nlh); 4455 4456 nla_put_failure: 4457 nlmsg_cancel(skb, nlh); 4458 return -EMSGSIZE; 4459 } 4460 4461 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb) 4462 { 4463 struct net *net = sock_net(skb->sk); 4464 int h, s_h; 4465 int idx = 0, s_idx; 4466 struct net_device *dev; 4467 struct inet6_dev *idev; 4468 struct hlist_head *head; 4469 4470 s_h = cb->args[0]; 4471 s_idx = cb->args[1]; 4472 4473 rcu_read_lock(); 4474 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 4475 idx = 0; 4476 head = &net->dev_index_head[h]; 4477 hlist_for_each_entry_rcu(dev, head, index_hlist) { 4478 if (idx < s_idx) 4479 goto cont; 4480 idev = __in6_dev_get(dev); 4481 if (!idev) 4482 goto cont; 4483 if (inet6_fill_ifinfo(skb, idev, 4484 NETLINK_CB(cb->skb).portid, 4485 cb->nlh->nlmsg_seq, 4486 RTM_NEWLINK, NLM_F_MULTI) <= 0) 4487 goto out; 4488 cont: 4489 idx++; 4490 } 4491 } 4492 out: 4493 rcu_read_unlock(); 4494 cb->args[1] = idx; 4495 cb->args[0] = h; 4496 4497 return skb->len; 4498 } 4499 4500 void inet6_ifinfo_notify(int event, struct inet6_dev *idev) 4501 { 4502 struct sk_buff *skb; 4503 struct net *net = dev_net(idev->dev); 4504 int err = -ENOBUFS; 4505 4506 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC); 4507 if (skb == NULL) 4508 goto errout; 4509 4510 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0); 4511 if (err < 0) { 4512 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */ 4513 WARN_ON(err == -EMSGSIZE); 4514 kfree_skb(skb); 4515 goto errout; 4516 } 4517 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC); 4518 return; 4519 errout: 4520 if (err < 0) 4521 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err); 4522 } 4523 4524 static inline size_t inet6_prefix_nlmsg_size(void) 4525 { 4526 return NLMSG_ALIGN(sizeof(struct prefixmsg)) 4527 + nla_total_size(sizeof(struct in6_addr)) 4528 + nla_total_size(sizeof(struct prefix_cacheinfo)); 4529 } 4530 4531 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev, 4532 struct prefix_info *pinfo, u32 portid, u32 seq, 4533 int event, unsigned int flags) 4534 { 4535 struct prefixmsg *pmsg; 4536 struct nlmsghdr *nlh; 4537 struct prefix_cacheinfo ci; 4538 4539 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags); 4540 if (nlh == NULL) 4541 return -EMSGSIZE; 4542 4543 pmsg = nlmsg_data(nlh); 4544 pmsg->prefix_family = AF_INET6; 4545 pmsg->prefix_pad1 = 0; 4546 pmsg->prefix_pad2 = 0; 4547 pmsg->prefix_ifindex = idev->dev->ifindex; 4548 pmsg->prefix_len = pinfo->prefix_len; 4549 pmsg->prefix_type = pinfo->type; 4550 pmsg->prefix_pad3 = 0; 4551 pmsg->prefix_flags = 0; 4552 if (pinfo->onlink) 4553 pmsg->prefix_flags |= IF_PREFIX_ONLINK; 4554 if (pinfo->autoconf) 4555 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF; 4556 4557 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix)) 4558 goto nla_put_failure; 4559 ci.preferred_time = ntohl(pinfo->prefered); 4560 ci.valid_time = ntohl(pinfo->valid); 4561 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci)) 4562 goto nla_put_failure; 4563 return nlmsg_end(skb, nlh); 4564 4565 nla_put_failure: 4566 nlmsg_cancel(skb, nlh); 4567 return -EMSGSIZE; 4568 } 4569 4570 static void inet6_prefix_notify(int event, struct inet6_dev *idev, 4571 struct prefix_info *pinfo) 4572 { 4573 struct sk_buff *skb; 4574 struct net *net = dev_net(idev->dev); 4575 int err = -ENOBUFS; 4576 4577 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC); 4578 if (skb == NULL) 4579 goto errout; 4580 4581 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0); 4582 if (err < 0) { 4583 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */ 4584 WARN_ON(err == -EMSGSIZE); 4585 kfree_skb(skb); 4586 goto errout; 4587 } 4588 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC); 4589 return; 4590 errout: 4591 if (err < 0) 4592 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err); 4593 } 4594 4595 static void update_valid_ll_addr_cnt(struct inet6_ifaddr *ifp, int count) 4596 { 4597 write_lock_bh(&ifp->idev->lock); 4598 spin_lock(&ifp->lock); 4599 if (((ifp->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE|IFA_F_OPTIMISTIC| 4600 IFA_F_DADFAILED)) == IFA_F_PERMANENT) && 4601 (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) 4602 ifp->idev->valid_ll_addr_cnt += count; 4603 WARN_ON(ifp->idev->valid_ll_addr_cnt < 0); 4604 spin_unlock(&ifp->lock); 4605 write_unlock_bh(&ifp->idev->lock); 4606 } 4607 4608 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 4609 { 4610 struct net *net = dev_net(ifp->idev->dev); 4611 4612 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp); 4613 4614 switch (event) { 4615 case RTM_NEWADDR: 4616 update_valid_ll_addr_cnt(ifp, 1); 4617 4618 /* 4619 * If the address was optimistic 4620 * we inserted the route at the start of 4621 * our DAD process, so we don't need 4622 * to do it again 4623 */ 4624 if (!(ifp->rt->rt6i_node)) 4625 ip6_ins_rt(ifp->rt); 4626 if (ifp->idev->cnf.forwarding) 4627 addrconf_join_anycast(ifp); 4628 if (!ipv6_addr_any(&ifp->peer_addr)) 4629 addrconf_prefix_route(&ifp->peer_addr, 128, 4630 ifp->idev->dev, 0, 0); 4631 break; 4632 case RTM_DELADDR: 4633 update_valid_ll_addr_cnt(ifp, -1); 4634 4635 if (ifp->idev->cnf.forwarding) 4636 addrconf_leave_anycast(ifp); 4637 addrconf_leave_solict(ifp->idev, &ifp->addr); 4638 if (!ipv6_addr_any(&ifp->peer_addr)) { 4639 struct rt6_info *rt; 4640 struct net_device *dev = ifp->idev->dev; 4641 4642 rt = rt6_lookup(dev_net(dev), &ifp->peer_addr, NULL, 4643 dev->ifindex, 1); 4644 if (rt) { 4645 dst_hold(&rt->dst); 4646 if (ip6_del_rt(rt)) 4647 dst_free(&rt->dst); 4648 } 4649 } 4650 dst_hold(&ifp->rt->dst); 4651 4652 if (ip6_del_rt(ifp->rt)) 4653 dst_free(&ifp->rt->dst); 4654 break; 4655 } 4656 atomic_inc(&net->ipv6.dev_addr_genid); 4657 } 4658 4659 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 4660 { 4661 rcu_read_lock_bh(); 4662 if (likely(ifp->idev->dead == 0)) 4663 __ipv6_ifa_notify(event, ifp); 4664 rcu_read_unlock_bh(); 4665 } 4666 4667 #ifdef CONFIG_SYSCTL 4668 4669 static 4670 int addrconf_sysctl_forward(struct ctl_table *ctl, int write, 4671 void __user *buffer, size_t *lenp, loff_t *ppos) 4672 { 4673 int *valp = ctl->data; 4674 int val = *valp; 4675 loff_t pos = *ppos; 4676 struct ctl_table lctl; 4677 int ret; 4678 4679 /* 4680 * ctl->data points to idev->cnf.forwarding, we should 4681 * not modify it until we get the rtnl lock. 4682 */ 4683 lctl = *ctl; 4684 lctl.data = &val; 4685 4686 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 4687 4688 if (write) 4689 ret = addrconf_fixup_forwarding(ctl, valp, val); 4690 if (ret) 4691 *ppos = pos; 4692 return ret; 4693 } 4694 4695 static void dev_disable_change(struct inet6_dev *idev) 4696 { 4697 struct netdev_notifier_info info; 4698 4699 if (!idev || !idev->dev) 4700 return; 4701 4702 netdev_notifier_info_init(&info, idev->dev); 4703 if (idev->cnf.disable_ipv6) 4704 addrconf_notify(NULL, NETDEV_DOWN, &info); 4705 else 4706 addrconf_notify(NULL, NETDEV_UP, &info); 4707 } 4708 4709 static void addrconf_disable_change(struct net *net, __s32 newf) 4710 { 4711 struct net_device *dev; 4712 struct inet6_dev *idev; 4713 4714 rcu_read_lock(); 4715 for_each_netdev_rcu(net, dev) { 4716 idev = __in6_dev_get(dev); 4717 if (idev) { 4718 int changed = (!idev->cnf.disable_ipv6) ^ (!newf); 4719 idev->cnf.disable_ipv6 = newf; 4720 if (changed) 4721 dev_disable_change(idev); 4722 } 4723 } 4724 rcu_read_unlock(); 4725 } 4726 4727 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf) 4728 { 4729 struct net *net; 4730 int old; 4731 4732 if (!rtnl_trylock()) 4733 return restart_syscall(); 4734 4735 net = (struct net *)table->extra2; 4736 old = *p; 4737 *p = newf; 4738 4739 if (p == &net->ipv6.devconf_dflt->disable_ipv6) { 4740 rtnl_unlock(); 4741 return 0; 4742 } 4743 4744 if (p == &net->ipv6.devconf_all->disable_ipv6) { 4745 net->ipv6.devconf_dflt->disable_ipv6 = newf; 4746 addrconf_disable_change(net, newf); 4747 } else if ((!newf) ^ (!old)) 4748 dev_disable_change((struct inet6_dev *)table->extra1); 4749 4750 rtnl_unlock(); 4751 return 0; 4752 } 4753 4754 static 4755 int addrconf_sysctl_disable(struct ctl_table *ctl, int write, 4756 void __user *buffer, size_t *lenp, loff_t *ppos) 4757 { 4758 int *valp = ctl->data; 4759 int val = *valp; 4760 loff_t pos = *ppos; 4761 struct ctl_table lctl; 4762 int ret; 4763 4764 /* 4765 * ctl->data points to idev->cnf.disable_ipv6, we should 4766 * not modify it until we get the rtnl lock. 4767 */ 4768 lctl = *ctl; 4769 lctl.data = &val; 4770 4771 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 4772 4773 if (write) 4774 ret = addrconf_disable_ipv6(ctl, valp, val); 4775 if (ret) 4776 *ppos = pos; 4777 return ret; 4778 } 4779 4780 static struct addrconf_sysctl_table 4781 { 4782 struct ctl_table_header *sysctl_header; 4783 struct ctl_table addrconf_vars[DEVCONF_MAX+1]; 4784 } addrconf_sysctl __read_mostly = { 4785 .sysctl_header = NULL, 4786 .addrconf_vars = { 4787 { 4788 .procname = "forwarding", 4789 .data = &ipv6_devconf.forwarding, 4790 .maxlen = sizeof(int), 4791 .mode = 0644, 4792 .proc_handler = addrconf_sysctl_forward, 4793 }, 4794 { 4795 .procname = "hop_limit", 4796 .data = &ipv6_devconf.hop_limit, 4797 .maxlen = sizeof(int), 4798 .mode = 0644, 4799 .proc_handler = proc_dointvec, 4800 }, 4801 { 4802 .procname = "mtu", 4803 .data = &ipv6_devconf.mtu6, 4804 .maxlen = sizeof(int), 4805 .mode = 0644, 4806 .proc_handler = proc_dointvec, 4807 }, 4808 { 4809 .procname = "accept_ra", 4810 .data = &ipv6_devconf.accept_ra, 4811 .maxlen = sizeof(int), 4812 .mode = 0644, 4813 .proc_handler = proc_dointvec, 4814 }, 4815 { 4816 .procname = "accept_redirects", 4817 .data = &ipv6_devconf.accept_redirects, 4818 .maxlen = sizeof(int), 4819 .mode = 0644, 4820 .proc_handler = proc_dointvec, 4821 }, 4822 { 4823 .procname = "autoconf", 4824 .data = &ipv6_devconf.autoconf, 4825 .maxlen = sizeof(int), 4826 .mode = 0644, 4827 .proc_handler = proc_dointvec, 4828 }, 4829 { 4830 .procname = "dad_transmits", 4831 .data = &ipv6_devconf.dad_transmits, 4832 .maxlen = sizeof(int), 4833 .mode = 0644, 4834 .proc_handler = proc_dointvec, 4835 }, 4836 { 4837 .procname = "router_solicitations", 4838 .data = &ipv6_devconf.rtr_solicits, 4839 .maxlen = sizeof(int), 4840 .mode = 0644, 4841 .proc_handler = proc_dointvec, 4842 }, 4843 { 4844 .procname = "router_solicitation_interval", 4845 .data = &ipv6_devconf.rtr_solicit_interval, 4846 .maxlen = sizeof(int), 4847 .mode = 0644, 4848 .proc_handler = proc_dointvec_jiffies, 4849 }, 4850 { 4851 .procname = "router_solicitation_delay", 4852 .data = &ipv6_devconf.rtr_solicit_delay, 4853 .maxlen = sizeof(int), 4854 .mode = 0644, 4855 .proc_handler = proc_dointvec_jiffies, 4856 }, 4857 { 4858 .procname = "force_mld_version", 4859 .data = &ipv6_devconf.force_mld_version, 4860 .maxlen = sizeof(int), 4861 .mode = 0644, 4862 .proc_handler = proc_dointvec, 4863 }, 4864 #ifdef CONFIG_IPV6_PRIVACY 4865 { 4866 .procname = "use_tempaddr", 4867 .data = &ipv6_devconf.use_tempaddr, 4868 .maxlen = sizeof(int), 4869 .mode = 0644, 4870 .proc_handler = proc_dointvec, 4871 }, 4872 { 4873 .procname = "temp_valid_lft", 4874 .data = &ipv6_devconf.temp_valid_lft, 4875 .maxlen = sizeof(int), 4876 .mode = 0644, 4877 .proc_handler = proc_dointvec, 4878 }, 4879 { 4880 .procname = "temp_prefered_lft", 4881 .data = &ipv6_devconf.temp_prefered_lft, 4882 .maxlen = sizeof(int), 4883 .mode = 0644, 4884 .proc_handler = proc_dointvec, 4885 }, 4886 { 4887 .procname = "regen_max_retry", 4888 .data = &ipv6_devconf.regen_max_retry, 4889 .maxlen = sizeof(int), 4890 .mode = 0644, 4891 .proc_handler = proc_dointvec, 4892 }, 4893 { 4894 .procname = "max_desync_factor", 4895 .data = &ipv6_devconf.max_desync_factor, 4896 .maxlen = sizeof(int), 4897 .mode = 0644, 4898 .proc_handler = proc_dointvec, 4899 }, 4900 #endif 4901 { 4902 .procname = "max_addresses", 4903 .data = &ipv6_devconf.max_addresses, 4904 .maxlen = sizeof(int), 4905 .mode = 0644, 4906 .proc_handler = proc_dointvec, 4907 }, 4908 { 4909 .procname = "accept_ra_defrtr", 4910 .data = &ipv6_devconf.accept_ra_defrtr, 4911 .maxlen = sizeof(int), 4912 .mode = 0644, 4913 .proc_handler = proc_dointvec, 4914 }, 4915 { 4916 .procname = "accept_ra_pinfo", 4917 .data = &ipv6_devconf.accept_ra_pinfo, 4918 .maxlen = sizeof(int), 4919 .mode = 0644, 4920 .proc_handler = proc_dointvec, 4921 }, 4922 #ifdef CONFIG_IPV6_ROUTER_PREF 4923 { 4924 .procname = "accept_ra_rtr_pref", 4925 .data = &ipv6_devconf.accept_ra_rtr_pref, 4926 .maxlen = sizeof(int), 4927 .mode = 0644, 4928 .proc_handler = proc_dointvec, 4929 }, 4930 { 4931 .procname = "router_probe_interval", 4932 .data = &ipv6_devconf.rtr_probe_interval, 4933 .maxlen = sizeof(int), 4934 .mode = 0644, 4935 .proc_handler = proc_dointvec_jiffies, 4936 }, 4937 #ifdef CONFIG_IPV6_ROUTE_INFO 4938 { 4939 .procname = "accept_ra_rt_info_max_plen", 4940 .data = &ipv6_devconf.accept_ra_rt_info_max_plen, 4941 .maxlen = sizeof(int), 4942 .mode = 0644, 4943 .proc_handler = proc_dointvec, 4944 }, 4945 #endif 4946 #endif 4947 { 4948 .procname = "proxy_ndp", 4949 .data = &ipv6_devconf.proxy_ndp, 4950 .maxlen = sizeof(int), 4951 .mode = 0644, 4952 .proc_handler = proc_dointvec, 4953 }, 4954 { 4955 .procname = "accept_source_route", 4956 .data = &ipv6_devconf.accept_source_route, 4957 .maxlen = sizeof(int), 4958 .mode = 0644, 4959 .proc_handler = proc_dointvec, 4960 }, 4961 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 4962 { 4963 .procname = "optimistic_dad", 4964 .data = &ipv6_devconf.optimistic_dad, 4965 .maxlen = sizeof(int), 4966 .mode = 0644, 4967 .proc_handler = proc_dointvec, 4968 4969 }, 4970 #endif 4971 #ifdef CONFIG_IPV6_MROUTE 4972 { 4973 .procname = "mc_forwarding", 4974 .data = &ipv6_devconf.mc_forwarding, 4975 .maxlen = sizeof(int), 4976 .mode = 0444, 4977 .proc_handler = proc_dointvec, 4978 }, 4979 #endif 4980 { 4981 .procname = "disable_ipv6", 4982 .data = &ipv6_devconf.disable_ipv6, 4983 .maxlen = sizeof(int), 4984 .mode = 0644, 4985 .proc_handler = addrconf_sysctl_disable, 4986 }, 4987 { 4988 .procname = "accept_dad", 4989 .data = &ipv6_devconf.accept_dad, 4990 .maxlen = sizeof(int), 4991 .mode = 0644, 4992 .proc_handler = proc_dointvec, 4993 }, 4994 { 4995 .procname = "force_tllao", 4996 .data = &ipv6_devconf.force_tllao, 4997 .maxlen = sizeof(int), 4998 .mode = 0644, 4999 .proc_handler = proc_dointvec 5000 }, 5001 { 5002 .procname = "ndisc_notify", 5003 .data = &ipv6_devconf.ndisc_notify, 5004 .maxlen = sizeof(int), 5005 .mode = 0644, 5006 .proc_handler = proc_dointvec 5007 }, 5008 { 5009 /* sentinel */ 5010 } 5011 }, 5012 }; 5013 5014 static int __addrconf_sysctl_register(struct net *net, char *dev_name, 5015 struct inet6_dev *idev, struct ipv6_devconf *p) 5016 { 5017 int i; 5018 struct addrconf_sysctl_table *t; 5019 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ]; 5020 5021 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL); 5022 if (t == NULL) 5023 goto out; 5024 5025 for (i = 0; t->addrconf_vars[i].data; i++) { 5026 t->addrconf_vars[i].data += (char *)p - (char *)&ipv6_devconf; 5027 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */ 5028 t->addrconf_vars[i].extra2 = net; 5029 } 5030 5031 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name); 5032 5033 t->sysctl_header = register_net_sysctl(net, path, t->addrconf_vars); 5034 if (t->sysctl_header == NULL) 5035 goto free; 5036 5037 p->sysctl = t; 5038 return 0; 5039 5040 free: 5041 kfree(t); 5042 out: 5043 return -ENOBUFS; 5044 } 5045 5046 static void __addrconf_sysctl_unregister(struct ipv6_devconf *p) 5047 { 5048 struct addrconf_sysctl_table *t; 5049 5050 if (p->sysctl == NULL) 5051 return; 5052 5053 t = p->sysctl; 5054 p->sysctl = NULL; 5055 unregister_net_sysctl_table(t->sysctl_header); 5056 kfree(t); 5057 } 5058 5059 static void addrconf_sysctl_register(struct inet6_dev *idev) 5060 { 5061 neigh_sysctl_register(idev->dev, idev->nd_parms, "ipv6", 5062 &ndisc_ifinfo_sysctl_change); 5063 __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name, 5064 idev, &idev->cnf); 5065 } 5066 5067 static void addrconf_sysctl_unregister(struct inet6_dev *idev) 5068 { 5069 __addrconf_sysctl_unregister(&idev->cnf); 5070 neigh_sysctl_unregister(idev->nd_parms); 5071 } 5072 5073 5074 #endif 5075 5076 static int __net_init addrconf_init_net(struct net *net) 5077 { 5078 int err = -ENOMEM; 5079 struct ipv6_devconf *all, *dflt; 5080 5081 all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL); 5082 if (all == NULL) 5083 goto err_alloc_all; 5084 5085 dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL); 5086 if (dflt == NULL) 5087 goto err_alloc_dflt; 5088 5089 /* these will be inherited by all namespaces */ 5090 dflt->autoconf = ipv6_defaults.autoconf; 5091 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6; 5092 5093 net->ipv6.devconf_all = all; 5094 net->ipv6.devconf_dflt = dflt; 5095 5096 #ifdef CONFIG_SYSCTL 5097 err = __addrconf_sysctl_register(net, "all", NULL, all); 5098 if (err < 0) 5099 goto err_reg_all; 5100 5101 err = __addrconf_sysctl_register(net, "default", NULL, dflt); 5102 if (err < 0) 5103 goto err_reg_dflt; 5104 #endif 5105 return 0; 5106 5107 #ifdef CONFIG_SYSCTL 5108 err_reg_dflt: 5109 __addrconf_sysctl_unregister(all); 5110 err_reg_all: 5111 kfree(dflt); 5112 #endif 5113 err_alloc_dflt: 5114 kfree(all); 5115 err_alloc_all: 5116 return err; 5117 } 5118 5119 static void __net_exit addrconf_exit_net(struct net *net) 5120 { 5121 #ifdef CONFIG_SYSCTL 5122 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt); 5123 __addrconf_sysctl_unregister(net->ipv6.devconf_all); 5124 #endif 5125 if (!net_eq(net, &init_net)) { 5126 kfree(net->ipv6.devconf_dflt); 5127 kfree(net->ipv6.devconf_all); 5128 } 5129 } 5130 5131 static struct pernet_operations addrconf_ops = { 5132 .init = addrconf_init_net, 5133 .exit = addrconf_exit_net, 5134 }; 5135 5136 static struct rtnl_af_ops inet6_ops = { 5137 .family = AF_INET6, 5138 .fill_link_af = inet6_fill_link_af, 5139 .get_link_af_size = inet6_get_link_af_size, 5140 .set_link_af = inet6_set_link_af, 5141 }; 5142 5143 /* 5144 * Init / cleanup code 5145 */ 5146 5147 int __init addrconf_init(void) 5148 { 5149 int i, err; 5150 5151 err = ipv6_addr_label_init(); 5152 if (err < 0) { 5153 pr_crit("%s: cannot initialize default policy table: %d\n", 5154 __func__, err); 5155 goto out; 5156 } 5157 5158 err = register_pernet_subsys(&addrconf_ops); 5159 if (err < 0) 5160 goto out_addrlabel; 5161 5162 /* The addrconf netdev notifier requires that loopback_dev 5163 * has it's ipv6 private information allocated and setup 5164 * before it can bring up and give link-local addresses 5165 * to other devices which are up. 5166 * 5167 * Unfortunately, loopback_dev is not necessarily the first 5168 * entry in the global dev_base list of net devices. In fact, 5169 * it is likely to be the very last entry on that list. 5170 * So this causes the notifier registry below to try and 5171 * give link-local addresses to all devices besides loopback_dev 5172 * first, then loopback_dev, which cases all the non-loopback_dev 5173 * devices to fail to get a link-local address. 5174 * 5175 * So, as a temporary fix, allocate the ipv6 structure for 5176 * loopback_dev first by hand. 5177 * Longer term, all of the dependencies ipv6 has upon the loopback 5178 * device and it being up should be removed. 5179 */ 5180 rtnl_lock(); 5181 if (!ipv6_add_dev(init_net.loopback_dev)) 5182 err = -ENOMEM; 5183 rtnl_unlock(); 5184 if (err) 5185 goto errlo; 5186 5187 for (i = 0; i < IN6_ADDR_HSIZE; i++) 5188 INIT_HLIST_HEAD(&inet6_addr_lst[i]); 5189 5190 register_netdevice_notifier(&ipv6_dev_notf); 5191 5192 addrconf_verify(0); 5193 5194 err = rtnl_af_register(&inet6_ops); 5195 if (err < 0) 5196 goto errout_af; 5197 5198 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo, 5199 NULL); 5200 if (err < 0) 5201 goto errout; 5202 5203 /* Only the first call to __rtnl_register can fail */ 5204 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL, NULL); 5205 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL, NULL); 5206 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr, 5207 inet6_dump_ifaddr, NULL); 5208 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL, 5209 inet6_dump_ifmcaddr, NULL); 5210 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL, 5211 inet6_dump_ifacaddr, NULL); 5212 __rtnl_register(PF_INET6, RTM_GETNETCONF, inet6_netconf_get_devconf, 5213 inet6_netconf_dump_devconf, NULL); 5214 5215 ipv6_addr_label_rtnl_register(); 5216 5217 return 0; 5218 errout: 5219 rtnl_af_unregister(&inet6_ops); 5220 errout_af: 5221 unregister_netdevice_notifier(&ipv6_dev_notf); 5222 errlo: 5223 unregister_pernet_subsys(&addrconf_ops); 5224 out_addrlabel: 5225 ipv6_addr_label_cleanup(); 5226 out: 5227 return err; 5228 } 5229 5230 void addrconf_cleanup(void) 5231 { 5232 struct net_device *dev; 5233 int i; 5234 5235 unregister_netdevice_notifier(&ipv6_dev_notf); 5236 unregister_pernet_subsys(&addrconf_ops); 5237 ipv6_addr_label_cleanup(); 5238 5239 rtnl_lock(); 5240 5241 __rtnl_af_unregister(&inet6_ops); 5242 5243 /* clean dev list */ 5244 for_each_netdev(&init_net, dev) { 5245 if (__in6_dev_get(dev) == NULL) 5246 continue; 5247 addrconf_ifdown(dev, 1); 5248 } 5249 addrconf_ifdown(init_net.loopback_dev, 2); 5250 5251 /* 5252 * Check hash table. 5253 */ 5254 spin_lock_bh(&addrconf_hash_lock); 5255 for (i = 0; i < IN6_ADDR_HSIZE; i++) 5256 WARN_ON(!hlist_empty(&inet6_addr_lst[i])); 5257 spin_unlock_bh(&addrconf_hash_lock); 5258 5259 del_timer(&addr_chk_timer); 5260 rtnl_unlock(); 5261 } 5262