1 /* 2 * IPv6 Address [auto]configuration 3 * Linux INET6 implementation 4 * 5 * Authors: 6 * Pedro Roque <roque@di.fc.ul.pt> 7 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru> 8 * 9 * This program is free software; you can redistribute it and/or 10 * modify it under the terms of the GNU General Public License 11 * as published by the Free Software Foundation; either version 12 * 2 of the License, or (at your option) any later version. 13 */ 14 15 /* 16 * Changes: 17 * 18 * Janos Farkas : delete timer on ifdown 19 * <chexum@bankinf.banki.hu> 20 * Andi Kleen : kill double kfree on module 21 * unload. 22 * Maciej W. Rozycki : FDDI support 23 * sekiya@USAGI : Don't send too many RS 24 * packets. 25 * yoshfuji@USAGI : Fixed interval between DAD 26 * packets. 27 * YOSHIFUJI Hideaki @USAGI : improved accuracy of 28 * address validation timer. 29 * YOSHIFUJI Hideaki @USAGI : Privacy Extensions (RFC3041) 30 * support. 31 * Yuji SEKIYA @USAGI : Don't assign a same IPv6 32 * address on a same interface. 33 * YOSHIFUJI Hideaki @USAGI : ARCnet support 34 * YOSHIFUJI Hideaki @USAGI : convert /proc/net/if_inet6 to 35 * seq_file. 36 * YOSHIFUJI Hideaki @USAGI : improved source address 37 * selection; consider scope, 38 * status etc. 39 */ 40 41 #define pr_fmt(fmt) "IPv6: " fmt 42 43 #include <linux/errno.h> 44 #include <linux/types.h> 45 #include <linux/kernel.h> 46 #include <linux/socket.h> 47 #include <linux/sockios.h> 48 #include <linux/net.h> 49 #include <linux/in6.h> 50 #include <linux/netdevice.h> 51 #include <linux/if_addr.h> 52 #include <linux/if_arp.h> 53 #include <linux/if_arcnet.h> 54 #include <linux/if_infiniband.h> 55 #include <linux/route.h> 56 #include <linux/inetdevice.h> 57 #include <linux/init.h> 58 #include <linux/slab.h> 59 #ifdef CONFIG_SYSCTL 60 #include <linux/sysctl.h> 61 #endif 62 #include <linux/capability.h> 63 #include <linux/delay.h> 64 #include <linux/notifier.h> 65 #include <linux/string.h> 66 #include <linux/hash.h> 67 68 #include <net/net_namespace.h> 69 #include <net/sock.h> 70 #include <net/snmp.h> 71 72 #include <net/af_ieee802154.h> 73 #include <net/firewire.h> 74 #include <net/ipv6.h> 75 #include <net/protocol.h> 76 #include <net/ndisc.h> 77 #include <net/ip6_route.h> 78 #include <net/addrconf.h> 79 #include <net/tcp.h> 80 #include <net/ip.h> 81 #include <net/netlink.h> 82 #include <net/pkt_sched.h> 83 #include <linux/if_tunnel.h> 84 #include <linux/rtnetlink.h> 85 #include <linux/netconf.h> 86 87 #ifdef CONFIG_IPV6_PRIVACY 88 #include <linux/random.h> 89 #endif 90 91 #include <linux/uaccess.h> 92 #include <asm/unaligned.h> 93 94 #include <linux/proc_fs.h> 95 #include <linux/seq_file.h> 96 #include <linux/export.h> 97 98 /* Set to 3 to get tracing... */ 99 #define ACONF_DEBUG 2 100 101 #if ACONF_DEBUG >= 3 102 #define ADBG(x) printk x 103 #else 104 #define ADBG(x) 105 #endif 106 107 #define INFINITY_LIFE_TIME 0xFFFFFFFF 108 109 static inline u32 cstamp_delta(unsigned long cstamp) 110 { 111 return (cstamp - INITIAL_JIFFIES) * 100UL / HZ; 112 } 113 114 #ifdef CONFIG_SYSCTL 115 static void addrconf_sysctl_register(struct inet6_dev *idev); 116 static void addrconf_sysctl_unregister(struct inet6_dev *idev); 117 #else 118 static inline void addrconf_sysctl_register(struct inet6_dev *idev) 119 { 120 } 121 122 static inline void addrconf_sysctl_unregister(struct inet6_dev *idev) 123 { 124 } 125 #endif 126 127 #ifdef CONFIG_IPV6_PRIVACY 128 static void __ipv6_regen_rndid(struct inet6_dev *idev); 129 static void __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr); 130 static void ipv6_regen_rndid(unsigned long data); 131 #endif 132 133 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev); 134 static int ipv6_count_addresses(struct inet6_dev *idev); 135 136 /* 137 * Configured unicast address hash table 138 */ 139 static struct hlist_head inet6_addr_lst[IN6_ADDR_HSIZE]; 140 static DEFINE_SPINLOCK(addrconf_hash_lock); 141 142 static void addrconf_verify(unsigned long); 143 144 static DEFINE_TIMER(addr_chk_timer, addrconf_verify, 0, 0); 145 static DEFINE_SPINLOCK(addrconf_verify_lock); 146 147 static void addrconf_join_anycast(struct inet6_ifaddr *ifp); 148 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp); 149 150 static void addrconf_type_change(struct net_device *dev, 151 unsigned long event); 152 static int addrconf_ifdown(struct net_device *dev, int how); 153 154 static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx, 155 int plen, 156 const struct net_device *dev, 157 u32 flags, u32 noflags); 158 159 static void addrconf_dad_start(struct inet6_ifaddr *ifp); 160 static void addrconf_dad_timer(unsigned long data); 161 static void addrconf_dad_completed(struct inet6_ifaddr *ifp); 162 static void addrconf_dad_run(struct inet6_dev *idev); 163 static void addrconf_rs_timer(unsigned long data); 164 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa); 165 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa); 166 167 static void inet6_prefix_notify(int event, struct inet6_dev *idev, 168 struct prefix_info *pinfo); 169 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr, 170 struct net_device *dev); 171 172 static struct ipv6_devconf ipv6_devconf __read_mostly = { 173 .forwarding = 0, 174 .hop_limit = IPV6_DEFAULT_HOPLIMIT, 175 .mtu6 = IPV6_MIN_MTU, 176 .accept_ra = 1, 177 .accept_redirects = 1, 178 .autoconf = 1, 179 .force_mld_version = 0, 180 .dad_transmits = 1, 181 .rtr_solicits = MAX_RTR_SOLICITATIONS, 182 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL, 183 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY, 184 #ifdef CONFIG_IPV6_PRIVACY 185 .use_tempaddr = 0, 186 .temp_valid_lft = TEMP_VALID_LIFETIME, 187 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME, 188 .regen_max_retry = REGEN_MAX_RETRY, 189 .max_desync_factor = MAX_DESYNC_FACTOR, 190 #endif 191 .max_addresses = IPV6_MAX_ADDRESSES, 192 .accept_ra_defrtr = 1, 193 .accept_ra_pinfo = 1, 194 #ifdef CONFIG_IPV6_ROUTER_PREF 195 .accept_ra_rtr_pref = 1, 196 .rtr_probe_interval = 60 * HZ, 197 #ifdef CONFIG_IPV6_ROUTE_INFO 198 .accept_ra_rt_info_max_plen = 0, 199 #endif 200 #endif 201 .proxy_ndp = 0, 202 .accept_source_route = 0, /* we do not accept RH0 by default. */ 203 .disable_ipv6 = 0, 204 .accept_dad = 1, 205 }; 206 207 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = { 208 .forwarding = 0, 209 .hop_limit = IPV6_DEFAULT_HOPLIMIT, 210 .mtu6 = IPV6_MIN_MTU, 211 .accept_ra = 1, 212 .accept_redirects = 1, 213 .autoconf = 1, 214 .dad_transmits = 1, 215 .rtr_solicits = MAX_RTR_SOLICITATIONS, 216 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL, 217 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY, 218 #ifdef CONFIG_IPV6_PRIVACY 219 .use_tempaddr = 0, 220 .temp_valid_lft = TEMP_VALID_LIFETIME, 221 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME, 222 .regen_max_retry = REGEN_MAX_RETRY, 223 .max_desync_factor = MAX_DESYNC_FACTOR, 224 #endif 225 .max_addresses = IPV6_MAX_ADDRESSES, 226 .accept_ra_defrtr = 1, 227 .accept_ra_pinfo = 1, 228 #ifdef CONFIG_IPV6_ROUTER_PREF 229 .accept_ra_rtr_pref = 1, 230 .rtr_probe_interval = 60 * HZ, 231 #ifdef CONFIG_IPV6_ROUTE_INFO 232 .accept_ra_rt_info_max_plen = 0, 233 #endif 234 #endif 235 .proxy_ndp = 0, 236 .accept_source_route = 0, /* we do not accept RH0 by default. */ 237 .disable_ipv6 = 0, 238 .accept_dad = 1, 239 }; 240 241 /* IPv6 Wildcard Address and Loopback Address defined by RFC2553 */ 242 const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT; 243 const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT; 244 const struct in6_addr in6addr_linklocal_allnodes = IN6ADDR_LINKLOCAL_ALLNODES_INIT; 245 const struct in6_addr in6addr_linklocal_allrouters = IN6ADDR_LINKLOCAL_ALLROUTERS_INIT; 246 const struct in6_addr in6addr_interfacelocal_allnodes = IN6ADDR_INTERFACELOCAL_ALLNODES_INIT; 247 const struct in6_addr in6addr_interfacelocal_allrouters = IN6ADDR_INTERFACELOCAL_ALLROUTERS_INIT; 248 const struct in6_addr in6addr_sitelocal_allrouters = IN6ADDR_SITELOCAL_ALLROUTERS_INIT; 249 250 /* Check if a valid qdisc is available */ 251 static inline bool addrconf_qdisc_ok(const struct net_device *dev) 252 { 253 return !qdisc_tx_is_noop(dev); 254 } 255 256 static void addrconf_del_rs_timer(struct inet6_dev *idev) 257 { 258 if (del_timer(&idev->rs_timer)) 259 __in6_dev_put(idev); 260 } 261 262 static void addrconf_del_dad_timer(struct inet6_ifaddr *ifp) 263 { 264 if (del_timer(&ifp->dad_timer)) 265 __in6_ifa_put(ifp); 266 } 267 268 static void addrconf_mod_rs_timer(struct inet6_dev *idev, 269 unsigned long when) 270 { 271 if (!timer_pending(&idev->rs_timer)) 272 in6_dev_hold(idev); 273 mod_timer(&idev->rs_timer, jiffies + when); 274 } 275 276 static void addrconf_mod_dad_timer(struct inet6_ifaddr *ifp, 277 unsigned long when) 278 { 279 if (!timer_pending(&ifp->dad_timer)) 280 in6_ifa_hold(ifp); 281 mod_timer(&ifp->dad_timer, jiffies + when); 282 } 283 284 static int snmp6_alloc_dev(struct inet6_dev *idev) 285 { 286 if (snmp_mib_init((void __percpu **)idev->stats.ipv6, 287 sizeof(struct ipstats_mib), 288 __alignof__(struct ipstats_mib)) < 0) 289 goto err_ip; 290 idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device), 291 GFP_KERNEL); 292 if (!idev->stats.icmpv6dev) 293 goto err_icmp; 294 idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device), 295 GFP_KERNEL); 296 if (!idev->stats.icmpv6msgdev) 297 goto err_icmpmsg; 298 299 return 0; 300 301 err_icmpmsg: 302 kfree(idev->stats.icmpv6dev); 303 err_icmp: 304 snmp_mib_free((void __percpu **)idev->stats.ipv6); 305 err_ip: 306 return -ENOMEM; 307 } 308 309 static void snmp6_free_dev(struct inet6_dev *idev) 310 { 311 kfree(idev->stats.icmpv6msgdev); 312 kfree(idev->stats.icmpv6dev); 313 snmp_mib_free((void __percpu **)idev->stats.ipv6); 314 } 315 316 /* Nobody refers to this device, we may destroy it. */ 317 318 void in6_dev_finish_destroy(struct inet6_dev *idev) 319 { 320 struct net_device *dev = idev->dev; 321 322 WARN_ON(!list_empty(&idev->addr_list)); 323 WARN_ON(idev->mc_list != NULL); 324 WARN_ON(timer_pending(&idev->rs_timer)); 325 326 #ifdef NET_REFCNT_DEBUG 327 pr_debug("%s: %s\n", __func__, dev ? dev->name : "NIL"); 328 #endif 329 dev_put(dev); 330 if (!idev->dead) { 331 pr_warn("Freeing alive inet6 device %p\n", idev); 332 return; 333 } 334 snmp6_free_dev(idev); 335 kfree_rcu(idev, rcu); 336 } 337 EXPORT_SYMBOL(in6_dev_finish_destroy); 338 339 static struct inet6_dev *ipv6_add_dev(struct net_device *dev) 340 { 341 struct inet6_dev *ndev; 342 343 ASSERT_RTNL(); 344 345 if (dev->mtu < IPV6_MIN_MTU) 346 return NULL; 347 348 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL); 349 350 if (ndev == NULL) 351 return NULL; 352 353 rwlock_init(&ndev->lock); 354 ndev->dev = dev; 355 INIT_LIST_HEAD(&ndev->addr_list); 356 setup_timer(&ndev->rs_timer, addrconf_rs_timer, 357 (unsigned long)ndev); 358 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf)); 359 ndev->cnf.mtu6 = dev->mtu; 360 ndev->cnf.sysctl = NULL; 361 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl); 362 if (ndev->nd_parms == NULL) { 363 kfree(ndev); 364 return NULL; 365 } 366 if (ndev->cnf.forwarding) 367 dev_disable_lro(dev); 368 /* We refer to the device */ 369 dev_hold(dev); 370 371 if (snmp6_alloc_dev(ndev) < 0) { 372 ADBG((KERN_WARNING 373 "%s: cannot allocate memory for statistics; dev=%s.\n", 374 __func__, dev->name)); 375 neigh_parms_release(&nd_tbl, ndev->nd_parms); 376 dev_put(dev); 377 kfree(ndev); 378 return NULL; 379 } 380 381 if (snmp6_register_dev(ndev) < 0) { 382 ADBG((KERN_WARNING 383 "%s: cannot create /proc/net/dev_snmp6/%s\n", 384 __func__, dev->name)); 385 neigh_parms_release(&nd_tbl, ndev->nd_parms); 386 ndev->dead = 1; 387 in6_dev_finish_destroy(ndev); 388 return NULL; 389 } 390 391 /* One reference from device. We must do this before 392 * we invoke __ipv6_regen_rndid(). 393 */ 394 in6_dev_hold(ndev); 395 396 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK)) 397 ndev->cnf.accept_dad = -1; 398 399 #if IS_ENABLED(CONFIG_IPV6_SIT) 400 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) { 401 pr_info("%s: Disabled Multicast RS\n", dev->name); 402 ndev->cnf.rtr_solicits = 0; 403 } 404 #endif 405 406 #ifdef CONFIG_IPV6_PRIVACY 407 INIT_LIST_HEAD(&ndev->tempaddr_list); 408 setup_timer(&ndev->regen_timer, ipv6_regen_rndid, (unsigned long)ndev); 409 if ((dev->flags&IFF_LOOPBACK) || 410 dev->type == ARPHRD_TUNNEL || 411 dev->type == ARPHRD_TUNNEL6 || 412 dev->type == ARPHRD_SIT || 413 dev->type == ARPHRD_NONE) { 414 ndev->cnf.use_tempaddr = -1; 415 } else { 416 in6_dev_hold(ndev); 417 ipv6_regen_rndid((unsigned long) ndev); 418 } 419 #endif 420 ndev->token = in6addr_any; 421 422 if (netif_running(dev) && addrconf_qdisc_ok(dev)) 423 ndev->if_flags |= IF_READY; 424 425 ipv6_mc_init_dev(ndev); 426 ndev->tstamp = jiffies; 427 addrconf_sysctl_register(ndev); 428 /* protected by rtnl_lock */ 429 rcu_assign_pointer(dev->ip6_ptr, ndev); 430 431 /* Join interface-local all-node multicast group */ 432 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allnodes); 433 434 /* Join all-node multicast group */ 435 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes); 436 437 /* Join all-router multicast group if forwarding is set */ 438 if (ndev->cnf.forwarding && (dev->flags & IFF_MULTICAST)) 439 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters); 440 441 return ndev; 442 } 443 444 static struct inet6_dev *ipv6_find_idev(struct net_device *dev) 445 { 446 struct inet6_dev *idev; 447 448 ASSERT_RTNL(); 449 450 idev = __in6_dev_get(dev); 451 if (!idev) { 452 idev = ipv6_add_dev(dev); 453 if (!idev) 454 return NULL; 455 } 456 457 if (dev->flags&IFF_UP) 458 ipv6_mc_up(idev); 459 return idev; 460 } 461 462 static int inet6_netconf_msgsize_devconf(int type) 463 { 464 int size = NLMSG_ALIGN(sizeof(struct netconfmsg)) 465 + nla_total_size(4); /* NETCONFA_IFINDEX */ 466 467 /* type -1 is used for ALL */ 468 if (type == -1 || type == NETCONFA_FORWARDING) 469 size += nla_total_size(4); 470 #ifdef CONFIG_IPV6_MROUTE 471 if (type == -1 || type == NETCONFA_MC_FORWARDING) 472 size += nla_total_size(4); 473 #endif 474 475 return size; 476 } 477 478 static int inet6_netconf_fill_devconf(struct sk_buff *skb, int ifindex, 479 struct ipv6_devconf *devconf, u32 portid, 480 u32 seq, int event, unsigned int flags, 481 int type) 482 { 483 struct nlmsghdr *nlh; 484 struct netconfmsg *ncm; 485 486 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg), 487 flags); 488 if (nlh == NULL) 489 return -EMSGSIZE; 490 491 ncm = nlmsg_data(nlh); 492 ncm->ncm_family = AF_INET6; 493 494 if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0) 495 goto nla_put_failure; 496 497 /* type -1 is used for ALL */ 498 if ((type == -1 || type == NETCONFA_FORWARDING) && 499 nla_put_s32(skb, NETCONFA_FORWARDING, devconf->forwarding) < 0) 500 goto nla_put_failure; 501 #ifdef CONFIG_IPV6_MROUTE 502 if ((type == -1 || type == NETCONFA_MC_FORWARDING) && 503 nla_put_s32(skb, NETCONFA_MC_FORWARDING, 504 devconf->mc_forwarding) < 0) 505 goto nla_put_failure; 506 #endif 507 return nlmsg_end(skb, nlh); 508 509 nla_put_failure: 510 nlmsg_cancel(skb, nlh); 511 return -EMSGSIZE; 512 } 513 514 void inet6_netconf_notify_devconf(struct net *net, int type, int ifindex, 515 struct ipv6_devconf *devconf) 516 { 517 struct sk_buff *skb; 518 int err = -ENOBUFS; 519 520 skb = nlmsg_new(inet6_netconf_msgsize_devconf(type), GFP_ATOMIC); 521 if (skb == NULL) 522 goto errout; 523 524 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 0, 0, 525 RTM_NEWNETCONF, 0, type); 526 if (err < 0) { 527 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */ 528 WARN_ON(err == -EMSGSIZE); 529 kfree_skb(skb); 530 goto errout; 531 } 532 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_NETCONF, NULL, GFP_ATOMIC); 533 return; 534 errout: 535 rtnl_set_sk_err(net, RTNLGRP_IPV6_NETCONF, err); 536 } 537 538 static const struct nla_policy devconf_ipv6_policy[NETCONFA_MAX+1] = { 539 [NETCONFA_IFINDEX] = { .len = sizeof(int) }, 540 [NETCONFA_FORWARDING] = { .len = sizeof(int) }, 541 }; 542 543 static int inet6_netconf_get_devconf(struct sk_buff *in_skb, 544 struct nlmsghdr *nlh) 545 { 546 struct net *net = sock_net(in_skb->sk); 547 struct nlattr *tb[NETCONFA_MAX+1]; 548 struct netconfmsg *ncm; 549 struct sk_buff *skb; 550 struct ipv6_devconf *devconf; 551 struct inet6_dev *in6_dev; 552 struct net_device *dev; 553 int ifindex; 554 int err; 555 556 err = nlmsg_parse(nlh, sizeof(*ncm), tb, NETCONFA_MAX, 557 devconf_ipv6_policy); 558 if (err < 0) 559 goto errout; 560 561 err = EINVAL; 562 if (!tb[NETCONFA_IFINDEX]) 563 goto errout; 564 565 ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]); 566 switch (ifindex) { 567 case NETCONFA_IFINDEX_ALL: 568 devconf = net->ipv6.devconf_all; 569 break; 570 case NETCONFA_IFINDEX_DEFAULT: 571 devconf = net->ipv6.devconf_dflt; 572 break; 573 default: 574 dev = __dev_get_by_index(net, ifindex); 575 if (dev == NULL) 576 goto errout; 577 in6_dev = __in6_dev_get(dev); 578 if (in6_dev == NULL) 579 goto errout; 580 devconf = &in6_dev->cnf; 581 break; 582 } 583 584 err = -ENOBUFS; 585 skb = nlmsg_new(inet6_netconf_msgsize_devconf(-1), GFP_ATOMIC); 586 if (skb == NULL) 587 goto errout; 588 589 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 590 NETLINK_CB(in_skb).portid, 591 nlh->nlmsg_seq, RTM_NEWNETCONF, 0, 592 -1); 593 if (err < 0) { 594 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */ 595 WARN_ON(err == -EMSGSIZE); 596 kfree_skb(skb); 597 goto errout; 598 } 599 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid); 600 errout: 601 return err; 602 } 603 604 static int inet6_netconf_dump_devconf(struct sk_buff *skb, 605 struct netlink_callback *cb) 606 { 607 struct net *net = sock_net(skb->sk); 608 int h, s_h; 609 int idx, s_idx; 610 struct net_device *dev; 611 struct inet6_dev *idev; 612 struct hlist_head *head; 613 614 s_h = cb->args[0]; 615 s_idx = idx = cb->args[1]; 616 617 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 618 idx = 0; 619 head = &net->dev_index_head[h]; 620 rcu_read_lock(); 621 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ 622 net->dev_base_seq; 623 hlist_for_each_entry_rcu(dev, head, index_hlist) { 624 if (idx < s_idx) 625 goto cont; 626 idev = __in6_dev_get(dev); 627 if (!idev) 628 goto cont; 629 630 if (inet6_netconf_fill_devconf(skb, dev->ifindex, 631 &idev->cnf, 632 NETLINK_CB(cb->skb).portid, 633 cb->nlh->nlmsg_seq, 634 RTM_NEWNETCONF, 635 NLM_F_MULTI, 636 -1) <= 0) { 637 rcu_read_unlock(); 638 goto done; 639 } 640 nl_dump_check_consistent(cb, nlmsg_hdr(skb)); 641 cont: 642 idx++; 643 } 644 rcu_read_unlock(); 645 } 646 if (h == NETDEV_HASHENTRIES) { 647 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL, 648 net->ipv6.devconf_all, 649 NETLINK_CB(cb->skb).portid, 650 cb->nlh->nlmsg_seq, 651 RTM_NEWNETCONF, NLM_F_MULTI, 652 -1) <= 0) 653 goto done; 654 else 655 h++; 656 } 657 if (h == NETDEV_HASHENTRIES + 1) { 658 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT, 659 net->ipv6.devconf_dflt, 660 NETLINK_CB(cb->skb).portid, 661 cb->nlh->nlmsg_seq, 662 RTM_NEWNETCONF, NLM_F_MULTI, 663 -1) <= 0) 664 goto done; 665 else 666 h++; 667 } 668 done: 669 cb->args[0] = h; 670 cb->args[1] = idx; 671 672 return skb->len; 673 } 674 675 #ifdef CONFIG_SYSCTL 676 static void dev_forward_change(struct inet6_dev *idev) 677 { 678 struct net_device *dev; 679 struct inet6_ifaddr *ifa; 680 681 if (!idev) 682 return; 683 dev = idev->dev; 684 if (idev->cnf.forwarding) 685 dev_disable_lro(dev); 686 if (dev->flags & IFF_MULTICAST) { 687 if (idev->cnf.forwarding) { 688 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters); 689 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allrouters); 690 ipv6_dev_mc_inc(dev, &in6addr_sitelocal_allrouters); 691 } else { 692 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters); 693 ipv6_dev_mc_dec(dev, &in6addr_interfacelocal_allrouters); 694 ipv6_dev_mc_dec(dev, &in6addr_sitelocal_allrouters); 695 } 696 } 697 698 list_for_each_entry(ifa, &idev->addr_list, if_list) { 699 if (ifa->flags&IFA_F_TENTATIVE) 700 continue; 701 if (idev->cnf.forwarding) 702 addrconf_join_anycast(ifa); 703 else 704 addrconf_leave_anycast(ifa); 705 } 706 inet6_netconf_notify_devconf(dev_net(dev), NETCONFA_FORWARDING, 707 dev->ifindex, &idev->cnf); 708 } 709 710 711 static void addrconf_forward_change(struct net *net, __s32 newf) 712 { 713 struct net_device *dev; 714 struct inet6_dev *idev; 715 716 for_each_netdev(net, dev) { 717 idev = __in6_dev_get(dev); 718 if (idev) { 719 int changed = (!idev->cnf.forwarding) ^ (!newf); 720 idev->cnf.forwarding = newf; 721 if (changed) 722 dev_forward_change(idev); 723 } 724 } 725 } 726 727 static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf) 728 { 729 struct net *net; 730 int old; 731 732 if (!rtnl_trylock()) 733 return restart_syscall(); 734 735 net = (struct net *)table->extra2; 736 old = *p; 737 *p = newf; 738 739 if (p == &net->ipv6.devconf_dflt->forwarding) { 740 if ((!newf) ^ (!old)) 741 inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING, 742 NETCONFA_IFINDEX_DEFAULT, 743 net->ipv6.devconf_dflt); 744 rtnl_unlock(); 745 return 0; 746 } 747 748 if (p == &net->ipv6.devconf_all->forwarding) { 749 net->ipv6.devconf_dflt->forwarding = newf; 750 addrconf_forward_change(net, newf); 751 if ((!newf) ^ (!old)) 752 inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING, 753 NETCONFA_IFINDEX_ALL, 754 net->ipv6.devconf_all); 755 } else if ((!newf) ^ (!old)) 756 dev_forward_change((struct inet6_dev *)table->extra1); 757 rtnl_unlock(); 758 759 if (newf) 760 rt6_purge_dflt_routers(net); 761 return 1; 762 } 763 #endif 764 765 /* Nobody refers to this ifaddr, destroy it */ 766 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp) 767 { 768 WARN_ON(!hlist_unhashed(&ifp->addr_lst)); 769 770 #ifdef NET_REFCNT_DEBUG 771 pr_debug("%s\n", __func__); 772 #endif 773 774 in6_dev_put(ifp->idev); 775 776 if (del_timer(&ifp->dad_timer)) 777 pr_notice("Timer is still running, when freeing ifa=%p\n", ifp); 778 779 if (ifp->state != INET6_IFADDR_STATE_DEAD) { 780 pr_warn("Freeing alive inet6 address %p\n", ifp); 781 return; 782 } 783 ip6_rt_put(ifp->rt); 784 785 kfree_rcu(ifp, rcu); 786 } 787 788 static void 789 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp) 790 { 791 struct list_head *p; 792 int ifp_scope = ipv6_addr_src_scope(&ifp->addr); 793 794 /* 795 * Each device address list is sorted in order of scope - 796 * global before linklocal. 797 */ 798 list_for_each(p, &idev->addr_list) { 799 struct inet6_ifaddr *ifa 800 = list_entry(p, struct inet6_ifaddr, if_list); 801 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr)) 802 break; 803 } 804 805 list_add_tail(&ifp->if_list, p); 806 } 807 808 static u32 inet6_addr_hash(const struct in6_addr *addr) 809 { 810 return hash_32(ipv6_addr_hash(addr), IN6_ADDR_HSIZE_SHIFT); 811 } 812 813 /* On success it returns ifp with increased reference count */ 814 815 static struct inet6_ifaddr * 816 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, int pfxlen, 817 int scope, u32 flags) 818 { 819 struct inet6_ifaddr *ifa = NULL; 820 struct rt6_info *rt; 821 unsigned int hash; 822 int err = 0; 823 int addr_type = ipv6_addr_type(addr); 824 825 if (addr_type == IPV6_ADDR_ANY || 826 addr_type & IPV6_ADDR_MULTICAST || 827 (!(idev->dev->flags & IFF_LOOPBACK) && 828 addr_type & IPV6_ADDR_LOOPBACK)) 829 return ERR_PTR(-EADDRNOTAVAIL); 830 831 rcu_read_lock_bh(); 832 if (idev->dead) { 833 err = -ENODEV; /*XXX*/ 834 goto out2; 835 } 836 837 if (idev->cnf.disable_ipv6) { 838 err = -EACCES; 839 goto out2; 840 } 841 842 spin_lock(&addrconf_hash_lock); 843 844 /* Ignore adding duplicate addresses on an interface */ 845 if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) { 846 ADBG(("ipv6_add_addr: already assigned\n")); 847 err = -EEXIST; 848 goto out; 849 } 850 851 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC); 852 853 if (ifa == NULL) { 854 ADBG(("ipv6_add_addr: malloc failed\n")); 855 err = -ENOBUFS; 856 goto out; 857 } 858 859 rt = addrconf_dst_alloc(idev, addr, false); 860 if (IS_ERR(rt)) { 861 err = PTR_ERR(rt); 862 goto out; 863 } 864 865 ifa->addr = *addr; 866 867 spin_lock_init(&ifa->lock); 868 spin_lock_init(&ifa->state_lock); 869 setup_timer(&ifa->dad_timer, addrconf_dad_timer, 870 (unsigned long)ifa); 871 INIT_HLIST_NODE(&ifa->addr_lst); 872 ifa->scope = scope; 873 ifa->prefix_len = pfxlen; 874 ifa->flags = flags | IFA_F_TENTATIVE; 875 ifa->cstamp = ifa->tstamp = jiffies; 876 ifa->tokenized = false; 877 878 ifa->rt = rt; 879 880 ifa->idev = idev; 881 in6_dev_hold(idev); 882 /* For caller */ 883 in6_ifa_hold(ifa); 884 885 /* Add to big hash table */ 886 hash = inet6_addr_hash(addr); 887 888 hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]); 889 spin_unlock(&addrconf_hash_lock); 890 891 write_lock(&idev->lock); 892 /* Add to inet6_dev unicast addr list. */ 893 ipv6_link_dev_addr(idev, ifa); 894 895 #ifdef CONFIG_IPV6_PRIVACY 896 if (ifa->flags&IFA_F_TEMPORARY) { 897 list_add(&ifa->tmp_list, &idev->tempaddr_list); 898 in6_ifa_hold(ifa); 899 } 900 #endif 901 902 in6_ifa_hold(ifa); 903 write_unlock(&idev->lock); 904 out2: 905 rcu_read_unlock_bh(); 906 907 if (likely(err == 0)) 908 inet6addr_notifier_call_chain(NETDEV_UP, ifa); 909 else { 910 kfree(ifa); 911 ifa = ERR_PTR(err); 912 } 913 914 return ifa; 915 out: 916 spin_unlock(&addrconf_hash_lock); 917 goto out2; 918 } 919 920 /* This function wants to get referenced ifp and releases it before return */ 921 922 static void ipv6_del_addr(struct inet6_ifaddr *ifp) 923 { 924 struct inet6_ifaddr *ifa, *ifn; 925 struct inet6_dev *idev = ifp->idev; 926 int state; 927 int deleted = 0, onlink = 0; 928 unsigned long expires = jiffies; 929 930 spin_lock_bh(&ifp->state_lock); 931 state = ifp->state; 932 ifp->state = INET6_IFADDR_STATE_DEAD; 933 spin_unlock_bh(&ifp->state_lock); 934 935 if (state == INET6_IFADDR_STATE_DEAD) 936 goto out; 937 938 spin_lock_bh(&addrconf_hash_lock); 939 hlist_del_init_rcu(&ifp->addr_lst); 940 spin_unlock_bh(&addrconf_hash_lock); 941 942 write_lock_bh(&idev->lock); 943 #ifdef CONFIG_IPV6_PRIVACY 944 if (ifp->flags&IFA_F_TEMPORARY) { 945 list_del(&ifp->tmp_list); 946 if (ifp->ifpub) { 947 in6_ifa_put(ifp->ifpub); 948 ifp->ifpub = NULL; 949 } 950 __in6_ifa_put(ifp); 951 } 952 #endif 953 954 list_for_each_entry_safe(ifa, ifn, &idev->addr_list, if_list) { 955 if (ifa == ifp) { 956 list_del_init(&ifp->if_list); 957 __in6_ifa_put(ifp); 958 959 if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0) 960 break; 961 deleted = 1; 962 continue; 963 } else if (ifp->flags & IFA_F_PERMANENT) { 964 if (ipv6_prefix_equal(&ifa->addr, &ifp->addr, 965 ifp->prefix_len)) { 966 if (ifa->flags & IFA_F_PERMANENT) { 967 onlink = 1; 968 if (deleted) 969 break; 970 } else { 971 unsigned long lifetime; 972 973 if (!onlink) 974 onlink = -1; 975 976 spin_lock(&ifa->lock); 977 978 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ); 979 /* 980 * Note: Because this address is 981 * not permanent, lifetime < 982 * LONG_MAX / HZ here. 983 */ 984 if (time_before(expires, 985 ifa->tstamp + lifetime * HZ)) 986 expires = ifa->tstamp + lifetime * HZ; 987 spin_unlock(&ifa->lock); 988 } 989 } 990 } 991 } 992 write_unlock_bh(&idev->lock); 993 994 addrconf_del_dad_timer(ifp); 995 996 ipv6_ifa_notify(RTM_DELADDR, ifp); 997 998 inet6addr_notifier_call_chain(NETDEV_DOWN, ifp); 999 1000 /* 1001 * Purge or update corresponding prefix 1002 * 1003 * 1) we don't purge prefix here if address was not permanent. 1004 * prefix is managed by its own lifetime. 1005 * 2) if there're no addresses, delete prefix. 1006 * 3) if there're still other permanent address(es), 1007 * corresponding prefix is still permanent. 1008 * 4) otherwise, update prefix lifetime to the 1009 * longest valid lifetime among the corresponding 1010 * addresses on the device. 1011 * Note: subsequent RA will update lifetime. 1012 * 1013 * --yoshfuji 1014 */ 1015 if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) { 1016 struct in6_addr prefix; 1017 struct rt6_info *rt; 1018 1019 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len); 1020 1021 rt = addrconf_get_prefix_route(&prefix, 1022 ifp->prefix_len, 1023 ifp->idev->dev, 1024 0, RTF_GATEWAY | RTF_DEFAULT); 1025 1026 if (rt) { 1027 if (onlink == 0) { 1028 ip6_del_rt(rt); 1029 rt = NULL; 1030 } else if (!(rt->rt6i_flags & RTF_EXPIRES)) { 1031 rt6_set_expires(rt, expires); 1032 } 1033 } 1034 ip6_rt_put(rt); 1035 } 1036 1037 /* clean up prefsrc entries */ 1038 rt6_remove_prefsrc(ifp); 1039 out: 1040 in6_ifa_put(ifp); 1041 } 1042 1043 #ifdef CONFIG_IPV6_PRIVACY 1044 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift) 1045 { 1046 struct inet6_dev *idev = ifp->idev; 1047 struct in6_addr addr, *tmpaddr; 1048 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_tstamp, age; 1049 unsigned long regen_advance; 1050 int tmp_plen; 1051 int ret = 0; 1052 int max_addresses; 1053 u32 addr_flags; 1054 unsigned long now = jiffies; 1055 1056 write_lock(&idev->lock); 1057 if (ift) { 1058 spin_lock_bh(&ift->lock); 1059 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8); 1060 spin_unlock_bh(&ift->lock); 1061 tmpaddr = &addr; 1062 } else { 1063 tmpaddr = NULL; 1064 } 1065 retry: 1066 in6_dev_hold(idev); 1067 if (idev->cnf.use_tempaddr <= 0) { 1068 write_unlock(&idev->lock); 1069 pr_info("%s: use_tempaddr is disabled\n", __func__); 1070 in6_dev_put(idev); 1071 ret = -1; 1072 goto out; 1073 } 1074 spin_lock_bh(&ifp->lock); 1075 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) { 1076 idev->cnf.use_tempaddr = -1; /*XXX*/ 1077 spin_unlock_bh(&ifp->lock); 1078 write_unlock(&idev->lock); 1079 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n", 1080 __func__); 1081 in6_dev_put(idev); 1082 ret = -1; 1083 goto out; 1084 } 1085 in6_ifa_hold(ifp); 1086 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8); 1087 __ipv6_try_regen_rndid(idev, tmpaddr); 1088 memcpy(&addr.s6_addr[8], idev->rndid, 8); 1089 age = (now - ifp->tstamp) / HZ; 1090 tmp_valid_lft = min_t(__u32, 1091 ifp->valid_lft, 1092 idev->cnf.temp_valid_lft + age); 1093 tmp_prefered_lft = min_t(__u32, 1094 ifp->prefered_lft, 1095 idev->cnf.temp_prefered_lft + age - 1096 idev->cnf.max_desync_factor); 1097 tmp_plen = ifp->prefix_len; 1098 max_addresses = idev->cnf.max_addresses; 1099 tmp_tstamp = ifp->tstamp; 1100 spin_unlock_bh(&ifp->lock); 1101 1102 regen_advance = idev->cnf.regen_max_retry * 1103 idev->cnf.dad_transmits * 1104 idev->nd_parms->retrans_time / HZ; 1105 write_unlock(&idev->lock); 1106 1107 /* A temporary address is created only if this calculated Preferred 1108 * Lifetime is greater than REGEN_ADVANCE time units. In particular, 1109 * an implementation must not create a temporary address with a zero 1110 * Preferred Lifetime. 1111 */ 1112 if (tmp_prefered_lft <= regen_advance) { 1113 in6_ifa_put(ifp); 1114 in6_dev_put(idev); 1115 ret = -1; 1116 goto out; 1117 } 1118 1119 addr_flags = IFA_F_TEMPORARY; 1120 /* set in addrconf_prefix_rcv() */ 1121 if (ifp->flags & IFA_F_OPTIMISTIC) 1122 addr_flags |= IFA_F_OPTIMISTIC; 1123 1124 ift = !max_addresses || 1125 ipv6_count_addresses(idev) < max_addresses ? 1126 ipv6_add_addr(idev, &addr, tmp_plen, ipv6_addr_scope(&addr), 1127 addr_flags) : NULL; 1128 if (IS_ERR_OR_NULL(ift)) { 1129 in6_ifa_put(ifp); 1130 in6_dev_put(idev); 1131 pr_info("%s: retry temporary address regeneration\n", __func__); 1132 tmpaddr = &addr; 1133 write_lock(&idev->lock); 1134 goto retry; 1135 } 1136 1137 spin_lock_bh(&ift->lock); 1138 ift->ifpub = ifp; 1139 ift->valid_lft = tmp_valid_lft; 1140 ift->prefered_lft = tmp_prefered_lft; 1141 ift->cstamp = now; 1142 ift->tstamp = tmp_tstamp; 1143 spin_unlock_bh(&ift->lock); 1144 1145 addrconf_dad_start(ift); 1146 in6_ifa_put(ift); 1147 in6_dev_put(idev); 1148 out: 1149 return ret; 1150 } 1151 #endif 1152 1153 /* 1154 * Choose an appropriate source address (RFC3484) 1155 */ 1156 enum { 1157 IPV6_SADDR_RULE_INIT = 0, 1158 IPV6_SADDR_RULE_LOCAL, 1159 IPV6_SADDR_RULE_SCOPE, 1160 IPV6_SADDR_RULE_PREFERRED, 1161 #ifdef CONFIG_IPV6_MIP6 1162 IPV6_SADDR_RULE_HOA, 1163 #endif 1164 IPV6_SADDR_RULE_OIF, 1165 IPV6_SADDR_RULE_LABEL, 1166 #ifdef CONFIG_IPV6_PRIVACY 1167 IPV6_SADDR_RULE_PRIVACY, 1168 #endif 1169 IPV6_SADDR_RULE_ORCHID, 1170 IPV6_SADDR_RULE_PREFIX, 1171 IPV6_SADDR_RULE_MAX 1172 }; 1173 1174 struct ipv6_saddr_score { 1175 int rule; 1176 int addr_type; 1177 struct inet6_ifaddr *ifa; 1178 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX); 1179 int scopedist; 1180 int matchlen; 1181 }; 1182 1183 struct ipv6_saddr_dst { 1184 const struct in6_addr *addr; 1185 int ifindex; 1186 int scope; 1187 int label; 1188 unsigned int prefs; 1189 }; 1190 1191 static inline int ipv6_saddr_preferred(int type) 1192 { 1193 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK)) 1194 return 1; 1195 return 0; 1196 } 1197 1198 static int ipv6_get_saddr_eval(struct net *net, 1199 struct ipv6_saddr_score *score, 1200 struct ipv6_saddr_dst *dst, 1201 int i) 1202 { 1203 int ret; 1204 1205 if (i <= score->rule) { 1206 switch (i) { 1207 case IPV6_SADDR_RULE_SCOPE: 1208 ret = score->scopedist; 1209 break; 1210 case IPV6_SADDR_RULE_PREFIX: 1211 ret = score->matchlen; 1212 break; 1213 default: 1214 ret = !!test_bit(i, score->scorebits); 1215 } 1216 goto out; 1217 } 1218 1219 switch (i) { 1220 case IPV6_SADDR_RULE_INIT: 1221 /* Rule 0: remember if hiscore is not ready yet */ 1222 ret = !!score->ifa; 1223 break; 1224 case IPV6_SADDR_RULE_LOCAL: 1225 /* Rule 1: Prefer same address */ 1226 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr); 1227 break; 1228 case IPV6_SADDR_RULE_SCOPE: 1229 /* Rule 2: Prefer appropriate scope 1230 * 1231 * ret 1232 * ^ 1233 * -1 | d 15 1234 * ---+--+-+---> scope 1235 * | 1236 * | d is scope of the destination. 1237 * B-d | \ 1238 * | \ <- smaller scope is better if 1239 * B-15 | \ if scope is enough for destinaion. 1240 * | ret = B - scope (-1 <= scope >= d <= 15). 1241 * d-C-1 | / 1242 * |/ <- greater is better 1243 * -C / if scope is not enough for destination. 1244 * /| ret = scope - C (-1 <= d < scope <= 15). 1245 * 1246 * d - C - 1 < B -15 (for all -1 <= d <= 15). 1247 * C > d + 14 - B >= 15 + 14 - B = 29 - B. 1248 * Assume B = 0 and we get C > 29. 1249 */ 1250 ret = __ipv6_addr_src_scope(score->addr_type); 1251 if (ret >= dst->scope) 1252 ret = -ret; 1253 else 1254 ret -= 128; /* 30 is enough */ 1255 score->scopedist = ret; 1256 break; 1257 case IPV6_SADDR_RULE_PREFERRED: 1258 /* Rule 3: Avoid deprecated and optimistic addresses */ 1259 ret = ipv6_saddr_preferred(score->addr_type) || 1260 !(score->ifa->flags & (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC)); 1261 break; 1262 #ifdef CONFIG_IPV6_MIP6 1263 case IPV6_SADDR_RULE_HOA: 1264 { 1265 /* Rule 4: Prefer home address */ 1266 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA); 1267 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome; 1268 break; 1269 } 1270 #endif 1271 case IPV6_SADDR_RULE_OIF: 1272 /* Rule 5: Prefer outgoing interface */ 1273 ret = (!dst->ifindex || 1274 dst->ifindex == score->ifa->idev->dev->ifindex); 1275 break; 1276 case IPV6_SADDR_RULE_LABEL: 1277 /* Rule 6: Prefer matching label */ 1278 ret = ipv6_addr_label(net, 1279 &score->ifa->addr, score->addr_type, 1280 score->ifa->idev->dev->ifindex) == dst->label; 1281 break; 1282 #ifdef CONFIG_IPV6_PRIVACY 1283 case IPV6_SADDR_RULE_PRIVACY: 1284 { 1285 /* Rule 7: Prefer public address 1286 * Note: prefer temporary address if use_tempaddr >= 2 1287 */ 1288 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ? 1289 !!(dst->prefs & IPV6_PREFER_SRC_TMP) : 1290 score->ifa->idev->cnf.use_tempaddr >= 2; 1291 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp; 1292 break; 1293 } 1294 #endif 1295 case IPV6_SADDR_RULE_ORCHID: 1296 /* Rule 8-: Prefer ORCHID vs ORCHID or 1297 * non-ORCHID vs non-ORCHID 1298 */ 1299 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^ 1300 ipv6_addr_orchid(dst->addr)); 1301 break; 1302 case IPV6_SADDR_RULE_PREFIX: 1303 /* Rule 8: Use longest matching prefix */ 1304 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr); 1305 if (ret > score->ifa->prefix_len) 1306 ret = score->ifa->prefix_len; 1307 score->matchlen = ret; 1308 break; 1309 default: 1310 ret = 0; 1311 } 1312 1313 if (ret) 1314 __set_bit(i, score->scorebits); 1315 score->rule = i; 1316 out: 1317 return ret; 1318 } 1319 1320 int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev, 1321 const struct in6_addr *daddr, unsigned int prefs, 1322 struct in6_addr *saddr) 1323 { 1324 struct ipv6_saddr_score scores[2], 1325 *score = &scores[0], *hiscore = &scores[1]; 1326 struct ipv6_saddr_dst dst; 1327 struct net_device *dev; 1328 int dst_type; 1329 1330 dst_type = __ipv6_addr_type(daddr); 1331 dst.addr = daddr; 1332 dst.ifindex = dst_dev ? dst_dev->ifindex : 0; 1333 dst.scope = __ipv6_addr_src_scope(dst_type); 1334 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex); 1335 dst.prefs = prefs; 1336 1337 hiscore->rule = -1; 1338 hiscore->ifa = NULL; 1339 1340 rcu_read_lock(); 1341 1342 for_each_netdev_rcu(net, dev) { 1343 struct inet6_dev *idev; 1344 1345 /* Candidate Source Address (section 4) 1346 * - multicast and link-local destination address, 1347 * the set of candidate source address MUST only 1348 * include addresses assigned to interfaces 1349 * belonging to the same link as the outgoing 1350 * interface. 1351 * (- For site-local destination addresses, the 1352 * set of candidate source addresses MUST only 1353 * include addresses assigned to interfaces 1354 * belonging to the same site as the outgoing 1355 * interface.) 1356 */ 1357 if (((dst_type & IPV6_ADDR_MULTICAST) || 1358 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL) && 1359 dst.ifindex && dev->ifindex != dst.ifindex) 1360 continue; 1361 1362 idev = __in6_dev_get(dev); 1363 if (!idev) 1364 continue; 1365 1366 read_lock_bh(&idev->lock); 1367 list_for_each_entry(score->ifa, &idev->addr_list, if_list) { 1368 int i; 1369 1370 /* 1371 * - Tentative Address (RFC2462 section 5.4) 1372 * - A tentative address is not considered 1373 * "assigned to an interface" in the traditional 1374 * sense, unless it is also flagged as optimistic. 1375 * - Candidate Source Address (section 4) 1376 * - In any case, anycast addresses, multicast 1377 * addresses, and the unspecified address MUST 1378 * NOT be included in a candidate set. 1379 */ 1380 if ((score->ifa->flags & IFA_F_TENTATIVE) && 1381 (!(score->ifa->flags & IFA_F_OPTIMISTIC))) 1382 continue; 1383 1384 score->addr_type = __ipv6_addr_type(&score->ifa->addr); 1385 1386 if (unlikely(score->addr_type == IPV6_ADDR_ANY || 1387 score->addr_type & IPV6_ADDR_MULTICAST)) { 1388 LIMIT_NETDEBUG(KERN_DEBUG 1389 "ADDRCONF: unspecified / multicast address " 1390 "assigned as unicast address on %s", 1391 dev->name); 1392 continue; 1393 } 1394 1395 score->rule = -1; 1396 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX); 1397 1398 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) { 1399 int minihiscore, miniscore; 1400 1401 minihiscore = ipv6_get_saddr_eval(net, hiscore, &dst, i); 1402 miniscore = ipv6_get_saddr_eval(net, score, &dst, i); 1403 1404 if (minihiscore > miniscore) { 1405 if (i == IPV6_SADDR_RULE_SCOPE && 1406 score->scopedist > 0) { 1407 /* 1408 * special case: 1409 * each remaining entry 1410 * has too small (not enough) 1411 * scope, because ifa entries 1412 * are sorted by their scope 1413 * values. 1414 */ 1415 goto try_nextdev; 1416 } 1417 break; 1418 } else if (minihiscore < miniscore) { 1419 if (hiscore->ifa) 1420 in6_ifa_put(hiscore->ifa); 1421 1422 in6_ifa_hold(score->ifa); 1423 1424 swap(hiscore, score); 1425 1426 /* restore our iterator */ 1427 score->ifa = hiscore->ifa; 1428 1429 break; 1430 } 1431 } 1432 } 1433 try_nextdev: 1434 read_unlock_bh(&idev->lock); 1435 } 1436 rcu_read_unlock(); 1437 1438 if (!hiscore->ifa) 1439 return -EADDRNOTAVAIL; 1440 1441 *saddr = hiscore->ifa->addr; 1442 in6_ifa_put(hiscore->ifa); 1443 return 0; 1444 } 1445 EXPORT_SYMBOL(ipv6_dev_get_saddr); 1446 1447 int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr, 1448 unsigned char banned_flags) 1449 { 1450 struct inet6_ifaddr *ifp; 1451 int err = -EADDRNOTAVAIL; 1452 1453 list_for_each_entry(ifp, &idev->addr_list, if_list) { 1454 if (ifp->scope == IFA_LINK && 1455 !(ifp->flags & banned_flags)) { 1456 *addr = ifp->addr; 1457 err = 0; 1458 break; 1459 } 1460 } 1461 return err; 1462 } 1463 1464 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr, 1465 unsigned char banned_flags) 1466 { 1467 struct inet6_dev *idev; 1468 int err = -EADDRNOTAVAIL; 1469 1470 rcu_read_lock(); 1471 idev = __in6_dev_get(dev); 1472 if (idev) { 1473 read_lock_bh(&idev->lock); 1474 err = __ipv6_get_lladdr(idev, addr, banned_flags); 1475 read_unlock_bh(&idev->lock); 1476 } 1477 rcu_read_unlock(); 1478 return err; 1479 } 1480 1481 static int ipv6_count_addresses(struct inet6_dev *idev) 1482 { 1483 int cnt = 0; 1484 struct inet6_ifaddr *ifp; 1485 1486 read_lock_bh(&idev->lock); 1487 list_for_each_entry(ifp, &idev->addr_list, if_list) 1488 cnt++; 1489 read_unlock_bh(&idev->lock); 1490 return cnt; 1491 } 1492 1493 int ipv6_chk_addr(struct net *net, const struct in6_addr *addr, 1494 const struct net_device *dev, int strict) 1495 { 1496 struct inet6_ifaddr *ifp; 1497 unsigned int hash = inet6_addr_hash(addr); 1498 1499 rcu_read_lock_bh(); 1500 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) { 1501 if (!net_eq(dev_net(ifp->idev->dev), net)) 1502 continue; 1503 if (ipv6_addr_equal(&ifp->addr, addr) && 1504 !(ifp->flags&IFA_F_TENTATIVE) && 1505 (dev == NULL || ifp->idev->dev == dev || 1506 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) { 1507 rcu_read_unlock_bh(); 1508 return 1; 1509 } 1510 } 1511 1512 rcu_read_unlock_bh(); 1513 return 0; 1514 } 1515 EXPORT_SYMBOL(ipv6_chk_addr); 1516 1517 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr, 1518 struct net_device *dev) 1519 { 1520 unsigned int hash = inet6_addr_hash(addr); 1521 struct inet6_ifaddr *ifp; 1522 1523 hlist_for_each_entry(ifp, &inet6_addr_lst[hash], addr_lst) { 1524 if (!net_eq(dev_net(ifp->idev->dev), net)) 1525 continue; 1526 if (ipv6_addr_equal(&ifp->addr, addr)) { 1527 if (dev == NULL || ifp->idev->dev == dev) 1528 return true; 1529 } 1530 } 1531 return false; 1532 } 1533 1534 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev) 1535 { 1536 struct inet6_dev *idev; 1537 struct inet6_ifaddr *ifa; 1538 int onlink; 1539 1540 onlink = 0; 1541 rcu_read_lock(); 1542 idev = __in6_dev_get(dev); 1543 if (idev) { 1544 read_lock_bh(&idev->lock); 1545 list_for_each_entry(ifa, &idev->addr_list, if_list) { 1546 onlink = ipv6_prefix_equal(addr, &ifa->addr, 1547 ifa->prefix_len); 1548 if (onlink) 1549 break; 1550 } 1551 read_unlock_bh(&idev->lock); 1552 } 1553 rcu_read_unlock(); 1554 return onlink; 1555 } 1556 EXPORT_SYMBOL(ipv6_chk_prefix); 1557 1558 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr, 1559 struct net_device *dev, int strict) 1560 { 1561 struct inet6_ifaddr *ifp, *result = NULL; 1562 unsigned int hash = inet6_addr_hash(addr); 1563 1564 rcu_read_lock_bh(); 1565 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) { 1566 if (!net_eq(dev_net(ifp->idev->dev), net)) 1567 continue; 1568 if (ipv6_addr_equal(&ifp->addr, addr)) { 1569 if (dev == NULL || ifp->idev->dev == dev || 1570 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) { 1571 result = ifp; 1572 in6_ifa_hold(ifp); 1573 break; 1574 } 1575 } 1576 } 1577 rcu_read_unlock_bh(); 1578 1579 return result; 1580 } 1581 1582 /* Gets referenced address, destroys ifaddr */ 1583 1584 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed) 1585 { 1586 if (ifp->flags&IFA_F_PERMANENT) { 1587 spin_lock_bh(&ifp->lock); 1588 addrconf_del_dad_timer(ifp); 1589 ifp->flags |= IFA_F_TENTATIVE; 1590 if (dad_failed) 1591 ifp->flags |= IFA_F_DADFAILED; 1592 spin_unlock_bh(&ifp->lock); 1593 if (dad_failed) 1594 ipv6_ifa_notify(0, ifp); 1595 in6_ifa_put(ifp); 1596 #ifdef CONFIG_IPV6_PRIVACY 1597 } else if (ifp->flags&IFA_F_TEMPORARY) { 1598 struct inet6_ifaddr *ifpub; 1599 spin_lock_bh(&ifp->lock); 1600 ifpub = ifp->ifpub; 1601 if (ifpub) { 1602 in6_ifa_hold(ifpub); 1603 spin_unlock_bh(&ifp->lock); 1604 ipv6_create_tempaddr(ifpub, ifp); 1605 in6_ifa_put(ifpub); 1606 } else { 1607 spin_unlock_bh(&ifp->lock); 1608 } 1609 ipv6_del_addr(ifp); 1610 #endif 1611 } else 1612 ipv6_del_addr(ifp); 1613 } 1614 1615 static int addrconf_dad_end(struct inet6_ifaddr *ifp) 1616 { 1617 int err = -ENOENT; 1618 1619 spin_lock(&ifp->state_lock); 1620 if (ifp->state == INET6_IFADDR_STATE_DAD) { 1621 ifp->state = INET6_IFADDR_STATE_POSTDAD; 1622 err = 0; 1623 } 1624 spin_unlock(&ifp->state_lock); 1625 1626 return err; 1627 } 1628 1629 void addrconf_dad_failure(struct inet6_ifaddr *ifp) 1630 { 1631 struct inet6_dev *idev = ifp->idev; 1632 1633 if (addrconf_dad_end(ifp)) { 1634 in6_ifa_put(ifp); 1635 return; 1636 } 1637 1638 net_info_ratelimited("%s: IPv6 duplicate address %pI6c detected!\n", 1639 ifp->idev->dev->name, &ifp->addr); 1640 1641 if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6) { 1642 struct in6_addr addr; 1643 1644 addr.s6_addr32[0] = htonl(0xfe800000); 1645 addr.s6_addr32[1] = 0; 1646 1647 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) && 1648 ipv6_addr_equal(&ifp->addr, &addr)) { 1649 /* DAD failed for link-local based on MAC address */ 1650 idev->cnf.disable_ipv6 = 1; 1651 1652 pr_info("%s: IPv6 being disabled!\n", 1653 ifp->idev->dev->name); 1654 } 1655 } 1656 1657 addrconf_dad_stop(ifp, 1); 1658 } 1659 1660 /* Join to solicited addr multicast group. */ 1661 1662 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr) 1663 { 1664 struct in6_addr maddr; 1665 1666 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP)) 1667 return; 1668 1669 addrconf_addr_solict_mult(addr, &maddr); 1670 ipv6_dev_mc_inc(dev, &maddr); 1671 } 1672 1673 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr) 1674 { 1675 struct in6_addr maddr; 1676 1677 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP)) 1678 return; 1679 1680 addrconf_addr_solict_mult(addr, &maddr); 1681 __ipv6_dev_mc_dec(idev, &maddr); 1682 } 1683 1684 static void addrconf_join_anycast(struct inet6_ifaddr *ifp) 1685 { 1686 struct in6_addr addr; 1687 if (ifp->prefix_len == 127) /* RFC 6164 */ 1688 return; 1689 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len); 1690 if (ipv6_addr_any(&addr)) 1691 return; 1692 ipv6_dev_ac_inc(ifp->idev->dev, &addr); 1693 } 1694 1695 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp) 1696 { 1697 struct in6_addr addr; 1698 if (ifp->prefix_len == 127) /* RFC 6164 */ 1699 return; 1700 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len); 1701 if (ipv6_addr_any(&addr)) 1702 return; 1703 __ipv6_dev_ac_dec(ifp->idev, &addr); 1704 } 1705 1706 static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev) 1707 { 1708 if (dev->addr_len != ETH_ALEN) 1709 return -1; 1710 memcpy(eui, dev->dev_addr, 3); 1711 memcpy(eui + 5, dev->dev_addr + 3, 3); 1712 1713 /* 1714 * The zSeries OSA network cards can be shared among various 1715 * OS instances, but the OSA cards have only one MAC address. 1716 * This leads to duplicate address conflicts in conjunction 1717 * with IPv6 if more than one instance uses the same card. 1718 * 1719 * The driver for these cards can deliver a unique 16-bit 1720 * identifier for each instance sharing the same card. It is 1721 * placed instead of 0xFFFE in the interface identifier. The 1722 * "u" bit of the interface identifier is not inverted in this 1723 * case. Hence the resulting interface identifier has local 1724 * scope according to RFC2373. 1725 */ 1726 if (dev->dev_id) { 1727 eui[3] = (dev->dev_id >> 8) & 0xFF; 1728 eui[4] = dev->dev_id & 0xFF; 1729 } else { 1730 eui[3] = 0xFF; 1731 eui[4] = 0xFE; 1732 eui[0] ^= 2; 1733 } 1734 return 0; 1735 } 1736 1737 static int addrconf_ifid_eui64(u8 *eui, struct net_device *dev) 1738 { 1739 if (dev->addr_len != IEEE802154_ADDR_LEN) 1740 return -1; 1741 memcpy(eui, dev->dev_addr, 8); 1742 eui[0] ^= 2; 1743 return 0; 1744 } 1745 1746 static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev) 1747 { 1748 union fwnet_hwaddr *ha; 1749 1750 if (dev->addr_len != FWNET_ALEN) 1751 return -1; 1752 1753 ha = (union fwnet_hwaddr *)dev->dev_addr; 1754 1755 memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id)); 1756 eui[0] ^= 2; 1757 return 0; 1758 } 1759 1760 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev) 1761 { 1762 /* XXX: inherit EUI-64 from other interface -- yoshfuji */ 1763 if (dev->addr_len != ARCNET_ALEN) 1764 return -1; 1765 memset(eui, 0, 7); 1766 eui[7] = *(u8 *)dev->dev_addr; 1767 return 0; 1768 } 1769 1770 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev) 1771 { 1772 if (dev->addr_len != INFINIBAND_ALEN) 1773 return -1; 1774 memcpy(eui, dev->dev_addr + 12, 8); 1775 eui[0] |= 2; 1776 return 0; 1777 } 1778 1779 static int __ipv6_isatap_ifid(u8 *eui, __be32 addr) 1780 { 1781 if (addr == 0) 1782 return -1; 1783 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) || 1784 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) || 1785 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) || 1786 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) || 1787 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) || 1788 ipv4_is_lbcast(addr)) ? 0x00 : 0x02; 1789 eui[1] = 0; 1790 eui[2] = 0x5E; 1791 eui[3] = 0xFE; 1792 memcpy(eui + 4, &addr, 4); 1793 return 0; 1794 } 1795 1796 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev) 1797 { 1798 if (dev->priv_flags & IFF_ISATAP) 1799 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr); 1800 return -1; 1801 } 1802 1803 static int addrconf_ifid_gre(u8 *eui, struct net_device *dev) 1804 { 1805 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr); 1806 } 1807 1808 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev) 1809 { 1810 switch (dev->type) { 1811 case ARPHRD_ETHER: 1812 case ARPHRD_FDDI: 1813 return addrconf_ifid_eui48(eui, dev); 1814 case ARPHRD_ARCNET: 1815 return addrconf_ifid_arcnet(eui, dev); 1816 case ARPHRD_INFINIBAND: 1817 return addrconf_ifid_infiniband(eui, dev); 1818 case ARPHRD_SIT: 1819 return addrconf_ifid_sit(eui, dev); 1820 case ARPHRD_IPGRE: 1821 return addrconf_ifid_gre(eui, dev); 1822 case ARPHRD_IEEE802154: 1823 return addrconf_ifid_eui64(eui, dev); 1824 case ARPHRD_IEEE1394: 1825 return addrconf_ifid_ieee1394(eui, dev); 1826 } 1827 return -1; 1828 } 1829 1830 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev) 1831 { 1832 int err = -1; 1833 struct inet6_ifaddr *ifp; 1834 1835 read_lock_bh(&idev->lock); 1836 list_for_each_entry(ifp, &idev->addr_list, if_list) { 1837 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) { 1838 memcpy(eui, ifp->addr.s6_addr+8, 8); 1839 err = 0; 1840 break; 1841 } 1842 } 1843 read_unlock_bh(&idev->lock); 1844 return err; 1845 } 1846 1847 #ifdef CONFIG_IPV6_PRIVACY 1848 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */ 1849 static void __ipv6_regen_rndid(struct inet6_dev *idev) 1850 { 1851 regen: 1852 get_random_bytes(idev->rndid, sizeof(idev->rndid)); 1853 idev->rndid[0] &= ~0x02; 1854 1855 /* 1856 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>: 1857 * check if generated address is not inappropriate 1858 * 1859 * - Reserved subnet anycast (RFC 2526) 1860 * 11111101 11....11 1xxxxxxx 1861 * - ISATAP (RFC4214) 6.1 1862 * 00-00-5E-FE-xx-xx-xx-xx 1863 * - value 0 1864 * - XXX: already assigned to an address on the device 1865 */ 1866 if (idev->rndid[0] == 0xfd && 1867 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff && 1868 (idev->rndid[7]&0x80)) 1869 goto regen; 1870 if ((idev->rndid[0]|idev->rndid[1]) == 0) { 1871 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe) 1872 goto regen; 1873 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00) 1874 goto regen; 1875 } 1876 } 1877 1878 static void ipv6_regen_rndid(unsigned long data) 1879 { 1880 struct inet6_dev *idev = (struct inet6_dev *) data; 1881 unsigned long expires; 1882 1883 rcu_read_lock_bh(); 1884 write_lock_bh(&idev->lock); 1885 1886 if (idev->dead) 1887 goto out; 1888 1889 __ipv6_regen_rndid(idev); 1890 1891 expires = jiffies + 1892 idev->cnf.temp_prefered_lft * HZ - 1893 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time - 1894 idev->cnf.max_desync_factor * HZ; 1895 if (time_before(expires, jiffies)) { 1896 pr_warn("%s: too short regeneration interval; timer disabled for %s\n", 1897 __func__, idev->dev->name); 1898 goto out; 1899 } 1900 1901 if (!mod_timer(&idev->regen_timer, expires)) 1902 in6_dev_hold(idev); 1903 1904 out: 1905 write_unlock_bh(&idev->lock); 1906 rcu_read_unlock_bh(); 1907 in6_dev_put(idev); 1908 } 1909 1910 static void __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) 1911 { 1912 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0) 1913 __ipv6_regen_rndid(idev); 1914 } 1915 #endif 1916 1917 /* 1918 * Add prefix route. 1919 */ 1920 1921 static void 1922 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev, 1923 unsigned long expires, u32 flags) 1924 { 1925 struct fib6_config cfg = { 1926 .fc_table = RT6_TABLE_PREFIX, 1927 .fc_metric = IP6_RT_PRIO_ADDRCONF, 1928 .fc_ifindex = dev->ifindex, 1929 .fc_expires = expires, 1930 .fc_dst_len = plen, 1931 .fc_flags = RTF_UP | flags, 1932 .fc_nlinfo.nl_net = dev_net(dev), 1933 .fc_protocol = RTPROT_KERNEL, 1934 }; 1935 1936 cfg.fc_dst = *pfx; 1937 1938 /* Prevent useless cloning on PtP SIT. 1939 This thing is done here expecting that the whole 1940 class of non-broadcast devices need not cloning. 1941 */ 1942 #if IS_ENABLED(CONFIG_IPV6_SIT) 1943 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT)) 1944 cfg.fc_flags |= RTF_NONEXTHOP; 1945 #endif 1946 1947 ip6_route_add(&cfg); 1948 } 1949 1950 1951 static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx, 1952 int plen, 1953 const struct net_device *dev, 1954 u32 flags, u32 noflags) 1955 { 1956 struct fib6_node *fn; 1957 struct rt6_info *rt = NULL; 1958 struct fib6_table *table; 1959 1960 table = fib6_get_table(dev_net(dev), RT6_TABLE_PREFIX); 1961 if (table == NULL) 1962 return NULL; 1963 1964 read_lock_bh(&table->tb6_lock); 1965 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0); 1966 if (!fn) 1967 goto out; 1968 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) { 1969 if (rt->dst.dev->ifindex != dev->ifindex) 1970 continue; 1971 if ((rt->rt6i_flags & flags) != flags) 1972 continue; 1973 if ((rt->rt6i_flags & noflags) != 0) 1974 continue; 1975 dst_hold(&rt->dst); 1976 break; 1977 } 1978 out: 1979 read_unlock_bh(&table->tb6_lock); 1980 return rt; 1981 } 1982 1983 1984 /* Create "default" multicast route to the interface */ 1985 1986 static void addrconf_add_mroute(struct net_device *dev) 1987 { 1988 struct fib6_config cfg = { 1989 .fc_table = RT6_TABLE_LOCAL, 1990 .fc_metric = IP6_RT_PRIO_ADDRCONF, 1991 .fc_ifindex = dev->ifindex, 1992 .fc_dst_len = 8, 1993 .fc_flags = RTF_UP, 1994 .fc_nlinfo.nl_net = dev_net(dev), 1995 }; 1996 1997 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0); 1998 1999 ip6_route_add(&cfg); 2000 } 2001 2002 #if IS_ENABLED(CONFIG_IPV6_SIT) 2003 static void sit_route_add(struct net_device *dev) 2004 { 2005 struct fib6_config cfg = { 2006 .fc_table = RT6_TABLE_MAIN, 2007 .fc_metric = IP6_RT_PRIO_ADDRCONF, 2008 .fc_ifindex = dev->ifindex, 2009 .fc_dst_len = 96, 2010 .fc_flags = RTF_UP | RTF_NONEXTHOP, 2011 .fc_nlinfo.nl_net = dev_net(dev), 2012 }; 2013 2014 /* prefix length - 96 bits "::d.d.d.d" */ 2015 ip6_route_add(&cfg); 2016 } 2017 #endif 2018 2019 static struct inet6_dev *addrconf_add_dev(struct net_device *dev) 2020 { 2021 struct inet6_dev *idev; 2022 2023 ASSERT_RTNL(); 2024 2025 idev = ipv6_find_idev(dev); 2026 if (!idev) 2027 return ERR_PTR(-ENOBUFS); 2028 2029 if (idev->cnf.disable_ipv6) 2030 return ERR_PTR(-EACCES); 2031 2032 /* Add default multicast route */ 2033 if (!(dev->flags & IFF_LOOPBACK)) 2034 addrconf_add_mroute(dev); 2035 2036 return idev; 2037 } 2038 2039 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao) 2040 { 2041 struct prefix_info *pinfo; 2042 __u32 valid_lft; 2043 __u32 prefered_lft; 2044 int addr_type; 2045 struct inet6_dev *in6_dev; 2046 struct net *net = dev_net(dev); 2047 2048 pinfo = (struct prefix_info *) opt; 2049 2050 if (len < sizeof(struct prefix_info)) { 2051 ADBG(("addrconf: prefix option too short\n")); 2052 return; 2053 } 2054 2055 /* 2056 * Validation checks ([ADDRCONF], page 19) 2057 */ 2058 2059 addr_type = ipv6_addr_type(&pinfo->prefix); 2060 2061 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL)) 2062 return; 2063 2064 valid_lft = ntohl(pinfo->valid); 2065 prefered_lft = ntohl(pinfo->prefered); 2066 2067 if (prefered_lft > valid_lft) { 2068 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n"); 2069 return; 2070 } 2071 2072 in6_dev = in6_dev_get(dev); 2073 2074 if (in6_dev == NULL) { 2075 net_dbg_ratelimited("addrconf: device %s not configured\n", 2076 dev->name); 2077 return; 2078 } 2079 2080 /* 2081 * Two things going on here: 2082 * 1) Add routes for on-link prefixes 2083 * 2) Configure prefixes with the auto flag set 2084 */ 2085 2086 if (pinfo->onlink) { 2087 struct rt6_info *rt; 2088 unsigned long rt_expires; 2089 2090 /* Avoid arithmetic overflow. Really, we could 2091 * save rt_expires in seconds, likely valid_lft, 2092 * but it would require division in fib gc, that it 2093 * not good. 2094 */ 2095 if (HZ > USER_HZ) 2096 rt_expires = addrconf_timeout_fixup(valid_lft, HZ); 2097 else 2098 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ); 2099 2100 if (addrconf_finite_timeout(rt_expires)) 2101 rt_expires *= HZ; 2102 2103 rt = addrconf_get_prefix_route(&pinfo->prefix, 2104 pinfo->prefix_len, 2105 dev, 2106 RTF_ADDRCONF | RTF_PREFIX_RT, 2107 RTF_GATEWAY | RTF_DEFAULT); 2108 2109 if (rt) { 2110 /* Autoconf prefix route */ 2111 if (valid_lft == 0) { 2112 ip6_del_rt(rt); 2113 rt = NULL; 2114 } else if (addrconf_finite_timeout(rt_expires)) { 2115 /* not infinity */ 2116 rt6_set_expires(rt, jiffies + rt_expires); 2117 } else { 2118 rt6_clean_expires(rt); 2119 } 2120 } else if (valid_lft) { 2121 clock_t expires = 0; 2122 int flags = RTF_ADDRCONF | RTF_PREFIX_RT; 2123 if (addrconf_finite_timeout(rt_expires)) { 2124 /* not infinity */ 2125 flags |= RTF_EXPIRES; 2126 expires = jiffies_to_clock_t(rt_expires); 2127 } 2128 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len, 2129 dev, expires, flags); 2130 } 2131 ip6_rt_put(rt); 2132 } 2133 2134 /* Try to figure out our local address for this prefix */ 2135 2136 if (pinfo->autoconf && in6_dev->cnf.autoconf) { 2137 struct inet6_ifaddr *ifp; 2138 struct in6_addr addr; 2139 int create = 0, update_lft = 0; 2140 bool tokenized = false; 2141 2142 if (pinfo->prefix_len == 64) { 2143 memcpy(&addr, &pinfo->prefix, 8); 2144 2145 if (!ipv6_addr_any(&in6_dev->token)) { 2146 read_lock_bh(&in6_dev->lock); 2147 memcpy(addr.s6_addr + 8, 2148 in6_dev->token.s6_addr + 8, 8); 2149 read_unlock_bh(&in6_dev->lock); 2150 tokenized = true; 2151 } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) && 2152 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) { 2153 in6_dev_put(in6_dev); 2154 return; 2155 } 2156 goto ok; 2157 } 2158 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n", 2159 pinfo->prefix_len); 2160 in6_dev_put(in6_dev); 2161 return; 2162 2163 ok: 2164 2165 ifp = ipv6_get_ifaddr(net, &addr, dev, 1); 2166 2167 if (ifp == NULL && valid_lft) { 2168 int max_addresses = in6_dev->cnf.max_addresses; 2169 u32 addr_flags = 0; 2170 2171 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 2172 if (in6_dev->cnf.optimistic_dad && 2173 !net->ipv6.devconf_all->forwarding && sllao) 2174 addr_flags = IFA_F_OPTIMISTIC; 2175 #endif 2176 2177 /* Do not allow to create too much of autoconfigured 2178 * addresses; this would be too easy way to crash kernel. 2179 */ 2180 if (!max_addresses || 2181 ipv6_count_addresses(in6_dev) < max_addresses) 2182 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len, 2183 addr_type&IPV6_ADDR_SCOPE_MASK, 2184 addr_flags); 2185 2186 if (IS_ERR_OR_NULL(ifp)) { 2187 in6_dev_put(in6_dev); 2188 return; 2189 } 2190 2191 update_lft = create = 1; 2192 ifp->cstamp = jiffies; 2193 ifp->tokenized = tokenized; 2194 addrconf_dad_start(ifp); 2195 } 2196 2197 if (ifp) { 2198 int flags; 2199 unsigned long now; 2200 #ifdef CONFIG_IPV6_PRIVACY 2201 struct inet6_ifaddr *ift; 2202 #endif 2203 u32 stored_lft; 2204 2205 /* update lifetime (RFC2462 5.5.3 e) */ 2206 spin_lock(&ifp->lock); 2207 now = jiffies; 2208 if (ifp->valid_lft > (now - ifp->tstamp) / HZ) 2209 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ; 2210 else 2211 stored_lft = 0; 2212 if (!update_lft && stored_lft) { 2213 if (valid_lft > MIN_VALID_LIFETIME || 2214 valid_lft > stored_lft) 2215 update_lft = 1; 2216 else if (stored_lft <= MIN_VALID_LIFETIME) { 2217 /* valid_lft <= stored_lft is always true */ 2218 /* 2219 * RFC 4862 Section 5.5.3e: 2220 * "Note that the preferred lifetime of 2221 * the corresponding address is always 2222 * reset to the Preferred Lifetime in 2223 * the received Prefix Information 2224 * option, regardless of whether the 2225 * valid lifetime is also reset or 2226 * ignored." 2227 * 2228 * So if the preferred lifetime in 2229 * this advertisement is different 2230 * than what we have stored, but the 2231 * valid lifetime is invalid, just 2232 * reset prefered_lft. 2233 * 2234 * We must set the valid lifetime 2235 * to the stored lifetime since we'll 2236 * be updating the timestamp below, 2237 * else we'll set it back to the 2238 * minimum. 2239 */ 2240 if (prefered_lft != ifp->prefered_lft) { 2241 valid_lft = stored_lft; 2242 update_lft = 1; 2243 } 2244 } else { 2245 valid_lft = MIN_VALID_LIFETIME; 2246 if (valid_lft < prefered_lft) 2247 prefered_lft = valid_lft; 2248 update_lft = 1; 2249 } 2250 } 2251 2252 if (update_lft) { 2253 ifp->valid_lft = valid_lft; 2254 ifp->prefered_lft = prefered_lft; 2255 ifp->tstamp = now; 2256 flags = ifp->flags; 2257 ifp->flags &= ~IFA_F_DEPRECATED; 2258 spin_unlock(&ifp->lock); 2259 2260 if (!(flags&IFA_F_TENTATIVE)) 2261 ipv6_ifa_notify(0, ifp); 2262 } else 2263 spin_unlock(&ifp->lock); 2264 2265 #ifdef CONFIG_IPV6_PRIVACY 2266 read_lock_bh(&in6_dev->lock); 2267 /* update all temporary addresses in the list */ 2268 list_for_each_entry(ift, &in6_dev->tempaddr_list, 2269 tmp_list) { 2270 int age, max_valid, max_prefered; 2271 2272 if (ifp != ift->ifpub) 2273 continue; 2274 2275 /* 2276 * RFC 4941 section 3.3: 2277 * If a received option will extend the lifetime 2278 * of a public address, the lifetimes of 2279 * temporary addresses should be extended, 2280 * subject to the overall constraint that no 2281 * temporary addresses should ever remain 2282 * "valid" or "preferred" for a time longer than 2283 * (TEMP_VALID_LIFETIME) or 2284 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), 2285 * respectively. 2286 */ 2287 age = (now - ift->cstamp) / HZ; 2288 max_valid = in6_dev->cnf.temp_valid_lft - age; 2289 if (max_valid < 0) 2290 max_valid = 0; 2291 2292 max_prefered = in6_dev->cnf.temp_prefered_lft - 2293 in6_dev->cnf.max_desync_factor - 2294 age; 2295 if (max_prefered < 0) 2296 max_prefered = 0; 2297 2298 if (valid_lft > max_valid) 2299 valid_lft = max_valid; 2300 2301 if (prefered_lft > max_prefered) 2302 prefered_lft = max_prefered; 2303 2304 spin_lock(&ift->lock); 2305 flags = ift->flags; 2306 ift->valid_lft = valid_lft; 2307 ift->prefered_lft = prefered_lft; 2308 ift->tstamp = now; 2309 if (prefered_lft > 0) 2310 ift->flags &= ~IFA_F_DEPRECATED; 2311 2312 spin_unlock(&ift->lock); 2313 if (!(flags&IFA_F_TENTATIVE)) 2314 ipv6_ifa_notify(0, ift); 2315 } 2316 2317 if ((create || list_empty(&in6_dev->tempaddr_list)) && in6_dev->cnf.use_tempaddr > 0) { 2318 /* 2319 * When a new public address is created as 2320 * described in [ADDRCONF], also create a new 2321 * temporary address. Also create a temporary 2322 * address if it's enabled but no temporary 2323 * address currently exists. 2324 */ 2325 read_unlock_bh(&in6_dev->lock); 2326 ipv6_create_tempaddr(ifp, NULL); 2327 } else { 2328 read_unlock_bh(&in6_dev->lock); 2329 } 2330 #endif 2331 in6_ifa_put(ifp); 2332 addrconf_verify(0); 2333 } 2334 } 2335 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo); 2336 in6_dev_put(in6_dev); 2337 } 2338 2339 /* 2340 * Set destination address. 2341 * Special case for SIT interfaces where we create a new "virtual" 2342 * device. 2343 */ 2344 int addrconf_set_dstaddr(struct net *net, void __user *arg) 2345 { 2346 struct in6_ifreq ireq; 2347 struct net_device *dev; 2348 int err = -EINVAL; 2349 2350 rtnl_lock(); 2351 2352 err = -EFAULT; 2353 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2354 goto err_exit; 2355 2356 dev = __dev_get_by_index(net, ireq.ifr6_ifindex); 2357 2358 err = -ENODEV; 2359 if (dev == NULL) 2360 goto err_exit; 2361 2362 #if IS_ENABLED(CONFIG_IPV6_SIT) 2363 if (dev->type == ARPHRD_SIT) { 2364 const struct net_device_ops *ops = dev->netdev_ops; 2365 struct ifreq ifr; 2366 struct ip_tunnel_parm p; 2367 2368 err = -EADDRNOTAVAIL; 2369 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4)) 2370 goto err_exit; 2371 2372 memset(&p, 0, sizeof(p)); 2373 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3]; 2374 p.iph.saddr = 0; 2375 p.iph.version = 4; 2376 p.iph.ihl = 5; 2377 p.iph.protocol = IPPROTO_IPV6; 2378 p.iph.ttl = 64; 2379 ifr.ifr_ifru.ifru_data = (__force void __user *)&p; 2380 2381 if (ops->ndo_do_ioctl) { 2382 mm_segment_t oldfs = get_fs(); 2383 2384 set_fs(KERNEL_DS); 2385 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL); 2386 set_fs(oldfs); 2387 } else 2388 err = -EOPNOTSUPP; 2389 2390 if (err == 0) { 2391 err = -ENOBUFS; 2392 dev = __dev_get_by_name(net, p.name); 2393 if (!dev) 2394 goto err_exit; 2395 err = dev_open(dev); 2396 } 2397 } 2398 #endif 2399 2400 err_exit: 2401 rtnl_unlock(); 2402 return err; 2403 } 2404 2405 /* 2406 * Manual configuration of address on an interface 2407 */ 2408 static int inet6_addr_add(struct net *net, int ifindex, const struct in6_addr *pfx, 2409 const struct in6_addr *peer_pfx, 2410 unsigned int plen, __u8 ifa_flags, __u32 prefered_lft, 2411 __u32 valid_lft) 2412 { 2413 struct inet6_ifaddr *ifp; 2414 struct inet6_dev *idev; 2415 struct net_device *dev; 2416 int scope; 2417 u32 flags; 2418 clock_t expires; 2419 unsigned long timeout; 2420 2421 ASSERT_RTNL(); 2422 2423 if (plen > 128) 2424 return -EINVAL; 2425 2426 /* check the lifetime */ 2427 if (!valid_lft || prefered_lft > valid_lft) 2428 return -EINVAL; 2429 2430 dev = __dev_get_by_index(net, ifindex); 2431 if (!dev) 2432 return -ENODEV; 2433 2434 idev = addrconf_add_dev(dev); 2435 if (IS_ERR(idev)) 2436 return PTR_ERR(idev); 2437 2438 scope = ipv6_addr_scope(pfx); 2439 2440 timeout = addrconf_timeout_fixup(valid_lft, HZ); 2441 if (addrconf_finite_timeout(timeout)) { 2442 expires = jiffies_to_clock_t(timeout * HZ); 2443 valid_lft = timeout; 2444 flags = RTF_EXPIRES; 2445 } else { 2446 expires = 0; 2447 flags = 0; 2448 ifa_flags |= IFA_F_PERMANENT; 2449 } 2450 2451 timeout = addrconf_timeout_fixup(prefered_lft, HZ); 2452 if (addrconf_finite_timeout(timeout)) { 2453 if (timeout == 0) 2454 ifa_flags |= IFA_F_DEPRECATED; 2455 prefered_lft = timeout; 2456 } 2457 2458 ifp = ipv6_add_addr(idev, pfx, plen, scope, ifa_flags); 2459 2460 if (!IS_ERR(ifp)) { 2461 spin_lock_bh(&ifp->lock); 2462 ifp->valid_lft = valid_lft; 2463 ifp->prefered_lft = prefered_lft; 2464 ifp->tstamp = jiffies; 2465 if (peer_pfx) 2466 ifp->peer_addr = *peer_pfx; 2467 spin_unlock_bh(&ifp->lock); 2468 2469 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev, 2470 expires, flags); 2471 /* 2472 * Note that section 3.1 of RFC 4429 indicates 2473 * that the Optimistic flag should not be set for 2474 * manually configured addresses 2475 */ 2476 addrconf_dad_start(ifp); 2477 in6_ifa_put(ifp); 2478 addrconf_verify(0); 2479 return 0; 2480 } 2481 2482 return PTR_ERR(ifp); 2483 } 2484 2485 static int inet6_addr_del(struct net *net, int ifindex, const struct in6_addr *pfx, 2486 unsigned int plen) 2487 { 2488 struct inet6_ifaddr *ifp; 2489 struct inet6_dev *idev; 2490 struct net_device *dev; 2491 2492 if (plen > 128) 2493 return -EINVAL; 2494 2495 dev = __dev_get_by_index(net, ifindex); 2496 if (!dev) 2497 return -ENODEV; 2498 2499 if ((idev = __in6_dev_get(dev)) == NULL) 2500 return -ENXIO; 2501 2502 read_lock_bh(&idev->lock); 2503 list_for_each_entry(ifp, &idev->addr_list, if_list) { 2504 if (ifp->prefix_len == plen && 2505 ipv6_addr_equal(pfx, &ifp->addr)) { 2506 in6_ifa_hold(ifp); 2507 read_unlock_bh(&idev->lock); 2508 2509 ipv6_del_addr(ifp); 2510 return 0; 2511 } 2512 } 2513 read_unlock_bh(&idev->lock); 2514 return -EADDRNOTAVAIL; 2515 } 2516 2517 2518 int addrconf_add_ifaddr(struct net *net, void __user *arg) 2519 { 2520 struct in6_ifreq ireq; 2521 int err; 2522 2523 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 2524 return -EPERM; 2525 2526 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2527 return -EFAULT; 2528 2529 rtnl_lock(); 2530 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, NULL, 2531 ireq.ifr6_prefixlen, IFA_F_PERMANENT, 2532 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME); 2533 rtnl_unlock(); 2534 return err; 2535 } 2536 2537 int addrconf_del_ifaddr(struct net *net, void __user *arg) 2538 { 2539 struct in6_ifreq ireq; 2540 int err; 2541 2542 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 2543 return -EPERM; 2544 2545 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2546 return -EFAULT; 2547 2548 rtnl_lock(); 2549 err = inet6_addr_del(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, 2550 ireq.ifr6_prefixlen); 2551 rtnl_unlock(); 2552 return err; 2553 } 2554 2555 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr, 2556 int plen, int scope) 2557 { 2558 struct inet6_ifaddr *ifp; 2559 2560 ifp = ipv6_add_addr(idev, addr, plen, scope, IFA_F_PERMANENT); 2561 if (!IS_ERR(ifp)) { 2562 spin_lock_bh(&ifp->lock); 2563 ifp->flags &= ~IFA_F_TENTATIVE; 2564 spin_unlock_bh(&ifp->lock); 2565 ipv6_ifa_notify(RTM_NEWADDR, ifp); 2566 in6_ifa_put(ifp); 2567 } 2568 } 2569 2570 #if IS_ENABLED(CONFIG_IPV6_SIT) 2571 static void sit_add_v4_addrs(struct inet6_dev *idev) 2572 { 2573 struct in6_addr addr; 2574 struct net_device *dev; 2575 struct net *net = dev_net(idev->dev); 2576 int scope; 2577 2578 ASSERT_RTNL(); 2579 2580 memset(&addr, 0, sizeof(struct in6_addr)); 2581 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4); 2582 2583 if (idev->dev->flags&IFF_POINTOPOINT) { 2584 addr.s6_addr32[0] = htonl(0xfe800000); 2585 scope = IFA_LINK; 2586 } else { 2587 scope = IPV6_ADDR_COMPATv4; 2588 } 2589 2590 if (addr.s6_addr32[3]) { 2591 add_addr(idev, &addr, 128, scope); 2592 return; 2593 } 2594 2595 for_each_netdev(net, dev) { 2596 struct in_device *in_dev = __in_dev_get_rtnl(dev); 2597 if (in_dev && (dev->flags & IFF_UP)) { 2598 struct in_ifaddr *ifa; 2599 2600 int flag = scope; 2601 2602 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) { 2603 int plen; 2604 2605 addr.s6_addr32[3] = ifa->ifa_local; 2606 2607 if (ifa->ifa_scope == RT_SCOPE_LINK) 2608 continue; 2609 if (ifa->ifa_scope >= RT_SCOPE_HOST) { 2610 if (idev->dev->flags&IFF_POINTOPOINT) 2611 continue; 2612 flag |= IFA_HOST; 2613 } 2614 if (idev->dev->flags&IFF_POINTOPOINT) 2615 plen = 64; 2616 else 2617 plen = 96; 2618 2619 add_addr(idev, &addr, plen, flag); 2620 } 2621 } 2622 } 2623 } 2624 #endif 2625 2626 static void init_loopback(struct net_device *dev) 2627 { 2628 struct inet6_dev *idev; 2629 struct net_device *sp_dev; 2630 struct inet6_ifaddr *sp_ifa; 2631 struct rt6_info *sp_rt; 2632 2633 /* ::1 */ 2634 2635 ASSERT_RTNL(); 2636 2637 if ((idev = ipv6_find_idev(dev)) == NULL) { 2638 pr_debug("%s: add_dev failed\n", __func__); 2639 return; 2640 } 2641 2642 add_addr(idev, &in6addr_loopback, 128, IFA_HOST); 2643 2644 /* Add routes to other interface's IPv6 addresses */ 2645 for_each_netdev(dev_net(dev), sp_dev) { 2646 if (!strcmp(sp_dev->name, dev->name)) 2647 continue; 2648 2649 idev = __in6_dev_get(sp_dev); 2650 if (!idev) 2651 continue; 2652 2653 read_lock_bh(&idev->lock); 2654 list_for_each_entry(sp_ifa, &idev->addr_list, if_list) { 2655 2656 if (sp_ifa->flags & (IFA_F_DADFAILED | IFA_F_TENTATIVE)) 2657 continue; 2658 2659 sp_rt = addrconf_dst_alloc(idev, &sp_ifa->addr, 0); 2660 2661 /* Failure cases are ignored */ 2662 if (!IS_ERR(sp_rt)) { 2663 sp_ifa->rt = sp_rt; 2664 ip6_ins_rt(sp_rt); 2665 } 2666 } 2667 read_unlock_bh(&idev->lock); 2668 } 2669 } 2670 2671 static void addrconf_add_linklocal(struct inet6_dev *idev, const struct in6_addr *addr) 2672 { 2673 struct inet6_ifaddr *ifp; 2674 u32 addr_flags = IFA_F_PERMANENT; 2675 2676 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 2677 if (idev->cnf.optimistic_dad && 2678 !dev_net(idev->dev)->ipv6.devconf_all->forwarding) 2679 addr_flags |= IFA_F_OPTIMISTIC; 2680 #endif 2681 2682 2683 ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, addr_flags); 2684 if (!IS_ERR(ifp)) { 2685 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0); 2686 addrconf_dad_start(ifp); 2687 in6_ifa_put(ifp); 2688 } 2689 } 2690 2691 static void addrconf_dev_config(struct net_device *dev) 2692 { 2693 struct in6_addr addr; 2694 struct inet6_dev *idev; 2695 2696 ASSERT_RTNL(); 2697 2698 if ((dev->type != ARPHRD_ETHER) && 2699 (dev->type != ARPHRD_FDDI) && 2700 (dev->type != ARPHRD_ARCNET) && 2701 (dev->type != ARPHRD_INFINIBAND) && 2702 (dev->type != ARPHRD_IEEE802154) && 2703 (dev->type != ARPHRD_IEEE1394)) { 2704 /* Alas, we support only Ethernet autoconfiguration. */ 2705 return; 2706 } 2707 2708 idev = addrconf_add_dev(dev); 2709 if (IS_ERR(idev)) 2710 return; 2711 2712 memset(&addr, 0, sizeof(struct in6_addr)); 2713 addr.s6_addr32[0] = htonl(0xFE800000); 2714 2715 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0) 2716 addrconf_add_linklocal(idev, &addr); 2717 } 2718 2719 #if IS_ENABLED(CONFIG_IPV6_SIT) 2720 static void addrconf_sit_config(struct net_device *dev) 2721 { 2722 struct inet6_dev *idev; 2723 2724 ASSERT_RTNL(); 2725 2726 /* 2727 * Configure the tunnel with one of our IPv4 2728 * addresses... we should configure all of 2729 * our v4 addrs in the tunnel 2730 */ 2731 2732 if ((idev = ipv6_find_idev(dev)) == NULL) { 2733 pr_debug("%s: add_dev failed\n", __func__); 2734 return; 2735 } 2736 2737 if (dev->priv_flags & IFF_ISATAP) { 2738 struct in6_addr addr; 2739 2740 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0); 2741 addrconf_prefix_route(&addr, 64, dev, 0, 0); 2742 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev)) 2743 addrconf_add_linklocal(idev, &addr); 2744 return; 2745 } 2746 2747 sit_add_v4_addrs(idev); 2748 2749 if (dev->flags&IFF_POINTOPOINT) 2750 addrconf_add_mroute(dev); 2751 else 2752 sit_route_add(dev); 2753 } 2754 #endif 2755 2756 #if IS_ENABLED(CONFIG_NET_IPGRE) 2757 static void addrconf_gre_config(struct net_device *dev) 2758 { 2759 struct inet6_dev *idev; 2760 struct in6_addr addr; 2761 2762 ASSERT_RTNL(); 2763 2764 if ((idev = ipv6_find_idev(dev)) == NULL) { 2765 pr_debug("%s: add_dev failed\n", __func__); 2766 return; 2767 } 2768 2769 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0); 2770 addrconf_prefix_route(&addr, 64, dev, 0, 0); 2771 2772 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev)) 2773 addrconf_add_linklocal(idev, &addr); 2774 } 2775 #endif 2776 2777 static inline int 2778 ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev) 2779 { 2780 struct in6_addr lladdr; 2781 2782 if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) { 2783 addrconf_add_linklocal(idev, &lladdr); 2784 return 0; 2785 } 2786 return -1; 2787 } 2788 2789 static void ip6_tnl_add_linklocal(struct inet6_dev *idev) 2790 { 2791 struct net_device *link_dev; 2792 struct net *net = dev_net(idev->dev); 2793 2794 /* first try to inherit the link-local address from the link device */ 2795 if (idev->dev->iflink && 2796 (link_dev = __dev_get_by_index(net, idev->dev->iflink))) { 2797 if (!ipv6_inherit_linklocal(idev, link_dev)) 2798 return; 2799 } 2800 /* then try to inherit it from any device */ 2801 for_each_netdev(net, link_dev) { 2802 if (!ipv6_inherit_linklocal(idev, link_dev)) 2803 return; 2804 } 2805 pr_debug("init ip6-ip6: add_linklocal failed\n"); 2806 } 2807 2808 /* 2809 * Autoconfigure tunnel with a link-local address so routing protocols, 2810 * DHCPv6, MLD etc. can be run over the virtual link 2811 */ 2812 2813 static void addrconf_ip6_tnl_config(struct net_device *dev) 2814 { 2815 struct inet6_dev *idev; 2816 2817 ASSERT_RTNL(); 2818 2819 idev = addrconf_add_dev(dev); 2820 if (IS_ERR(idev)) { 2821 pr_debug("init ip6-ip6: add_dev failed\n"); 2822 return; 2823 } 2824 ip6_tnl_add_linklocal(idev); 2825 } 2826 2827 static int addrconf_notify(struct notifier_block *this, unsigned long event, 2828 void *ptr) 2829 { 2830 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 2831 struct inet6_dev *idev = __in6_dev_get(dev); 2832 int run_pending = 0; 2833 int err; 2834 2835 switch (event) { 2836 case NETDEV_REGISTER: 2837 if (!idev && dev->mtu >= IPV6_MIN_MTU) { 2838 idev = ipv6_add_dev(dev); 2839 if (!idev) 2840 return notifier_from_errno(-ENOMEM); 2841 } 2842 break; 2843 2844 case NETDEV_UP: 2845 case NETDEV_CHANGE: 2846 if (dev->flags & IFF_SLAVE) 2847 break; 2848 2849 if (event == NETDEV_UP) { 2850 if (!addrconf_qdisc_ok(dev)) { 2851 /* device is not ready yet. */ 2852 pr_info("ADDRCONF(NETDEV_UP): %s: link is not ready\n", 2853 dev->name); 2854 break; 2855 } 2856 2857 if (!idev && dev->mtu >= IPV6_MIN_MTU) 2858 idev = ipv6_add_dev(dev); 2859 2860 if (idev) { 2861 idev->if_flags |= IF_READY; 2862 run_pending = 1; 2863 } 2864 } else { 2865 if (!addrconf_qdisc_ok(dev)) { 2866 /* device is still not ready. */ 2867 break; 2868 } 2869 2870 if (idev) { 2871 if (idev->if_flags & IF_READY) 2872 /* device is already configured. */ 2873 break; 2874 idev->if_flags |= IF_READY; 2875 } 2876 2877 pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n", 2878 dev->name); 2879 2880 run_pending = 1; 2881 } 2882 2883 switch (dev->type) { 2884 #if IS_ENABLED(CONFIG_IPV6_SIT) 2885 case ARPHRD_SIT: 2886 addrconf_sit_config(dev); 2887 break; 2888 #endif 2889 #if IS_ENABLED(CONFIG_NET_IPGRE) 2890 case ARPHRD_IPGRE: 2891 addrconf_gre_config(dev); 2892 break; 2893 #endif 2894 case ARPHRD_TUNNEL6: 2895 addrconf_ip6_tnl_config(dev); 2896 break; 2897 case ARPHRD_LOOPBACK: 2898 init_loopback(dev); 2899 break; 2900 2901 default: 2902 addrconf_dev_config(dev); 2903 break; 2904 } 2905 2906 if (idev) { 2907 if (run_pending) 2908 addrconf_dad_run(idev); 2909 2910 /* 2911 * If the MTU changed during the interface down, 2912 * when the interface up, the changed MTU must be 2913 * reflected in the idev as well as routers. 2914 */ 2915 if (idev->cnf.mtu6 != dev->mtu && 2916 dev->mtu >= IPV6_MIN_MTU) { 2917 rt6_mtu_change(dev, dev->mtu); 2918 idev->cnf.mtu6 = dev->mtu; 2919 } 2920 idev->tstamp = jiffies; 2921 inet6_ifinfo_notify(RTM_NEWLINK, idev); 2922 2923 /* 2924 * If the changed mtu during down is lower than 2925 * IPV6_MIN_MTU stop IPv6 on this interface. 2926 */ 2927 if (dev->mtu < IPV6_MIN_MTU) 2928 addrconf_ifdown(dev, 1); 2929 } 2930 break; 2931 2932 case NETDEV_CHANGEMTU: 2933 if (idev && dev->mtu >= IPV6_MIN_MTU) { 2934 rt6_mtu_change(dev, dev->mtu); 2935 idev->cnf.mtu6 = dev->mtu; 2936 break; 2937 } 2938 2939 if (!idev && dev->mtu >= IPV6_MIN_MTU) { 2940 idev = ipv6_add_dev(dev); 2941 if (idev) 2942 break; 2943 } 2944 2945 /* 2946 * MTU falled under IPV6_MIN_MTU. 2947 * Stop IPv6 on this interface. 2948 */ 2949 2950 case NETDEV_DOWN: 2951 case NETDEV_UNREGISTER: 2952 /* 2953 * Remove all addresses from this interface. 2954 */ 2955 addrconf_ifdown(dev, event != NETDEV_DOWN); 2956 break; 2957 2958 case NETDEV_CHANGENAME: 2959 if (idev) { 2960 snmp6_unregister_dev(idev); 2961 addrconf_sysctl_unregister(idev); 2962 addrconf_sysctl_register(idev); 2963 err = snmp6_register_dev(idev); 2964 if (err) 2965 return notifier_from_errno(err); 2966 } 2967 break; 2968 2969 case NETDEV_PRE_TYPE_CHANGE: 2970 case NETDEV_POST_TYPE_CHANGE: 2971 addrconf_type_change(dev, event); 2972 break; 2973 } 2974 2975 return NOTIFY_OK; 2976 } 2977 2978 /* 2979 * addrconf module should be notified of a device going up 2980 */ 2981 static struct notifier_block ipv6_dev_notf = { 2982 .notifier_call = addrconf_notify, 2983 }; 2984 2985 static void addrconf_type_change(struct net_device *dev, unsigned long event) 2986 { 2987 struct inet6_dev *idev; 2988 ASSERT_RTNL(); 2989 2990 idev = __in6_dev_get(dev); 2991 2992 if (event == NETDEV_POST_TYPE_CHANGE) 2993 ipv6_mc_remap(idev); 2994 else if (event == NETDEV_PRE_TYPE_CHANGE) 2995 ipv6_mc_unmap(idev); 2996 } 2997 2998 static int addrconf_ifdown(struct net_device *dev, int how) 2999 { 3000 struct net *net = dev_net(dev); 3001 struct inet6_dev *idev; 3002 struct inet6_ifaddr *ifa; 3003 int state, i; 3004 3005 ASSERT_RTNL(); 3006 3007 rt6_ifdown(net, dev); 3008 neigh_ifdown(&nd_tbl, dev); 3009 3010 idev = __in6_dev_get(dev); 3011 if (idev == NULL) 3012 return -ENODEV; 3013 3014 /* 3015 * Step 1: remove reference to ipv6 device from parent device. 3016 * Do not dev_put! 3017 */ 3018 if (how) { 3019 idev->dead = 1; 3020 3021 /* protected by rtnl_lock */ 3022 RCU_INIT_POINTER(dev->ip6_ptr, NULL); 3023 3024 /* Step 1.5: remove snmp6 entry */ 3025 snmp6_unregister_dev(idev); 3026 3027 } 3028 3029 /* Step 2: clear hash table */ 3030 for (i = 0; i < IN6_ADDR_HSIZE; i++) { 3031 struct hlist_head *h = &inet6_addr_lst[i]; 3032 3033 spin_lock_bh(&addrconf_hash_lock); 3034 restart: 3035 hlist_for_each_entry_rcu(ifa, h, addr_lst) { 3036 if (ifa->idev == idev) { 3037 hlist_del_init_rcu(&ifa->addr_lst); 3038 addrconf_del_dad_timer(ifa); 3039 goto restart; 3040 } 3041 } 3042 spin_unlock_bh(&addrconf_hash_lock); 3043 } 3044 3045 write_lock_bh(&idev->lock); 3046 3047 addrconf_del_rs_timer(idev); 3048 3049 /* Step 2: clear flags for stateless addrconf */ 3050 if (!how) 3051 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY); 3052 3053 #ifdef CONFIG_IPV6_PRIVACY 3054 if (how && del_timer(&idev->regen_timer)) 3055 in6_dev_put(idev); 3056 3057 /* Step 3: clear tempaddr list */ 3058 while (!list_empty(&idev->tempaddr_list)) { 3059 ifa = list_first_entry(&idev->tempaddr_list, 3060 struct inet6_ifaddr, tmp_list); 3061 list_del(&ifa->tmp_list); 3062 write_unlock_bh(&idev->lock); 3063 spin_lock_bh(&ifa->lock); 3064 3065 if (ifa->ifpub) { 3066 in6_ifa_put(ifa->ifpub); 3067 ifa->ifpub = NULL; 3068 } 3069 spin_unlock_bh(&ifa->lock); 3070 in6_ifa_put(ifa); 3071 write_lock_bh(&idev->lock); 3072 } 3073 #endif 3074 3075 while (!list_empty(&idev->addr_list)) { 3076 ifa = list_first_entry(&idev->addr_list, 3077 struct inet6_ifaddr, if_list); 3078 addrconf_del_dad_timer(ifa); 3079 3080 list_del(&ifa->if_list); 3081 3082 write_unlock_bh(&idev->lock); 3083 3084 spin_lock_bh(&ifa->state_lock); 3085 state = ifa->state; 3086 ifa->state = INET6_IFADDR_STATE_DEAD; 3087 spin_unlock_bh(&ifa->state_lock); 3088 3089 if (state != INET6_IFADDR_STATE_DEAD) { 3090 __ipv6_ifa_notify(RTM_DELADDR, ifa); 3091 inet6addr_notifier_call_chain(NETDEV_DOWN, ifa); 3092 } 3093 in6_ifa_put(ifa); 3094 3095 write_lock_bh(&idev->lock); 3096 } 3097 3098 write_unlock_bh(&idev->lock); 3099 3100 /* Step 5: Discard multicast list */ 3101 if (how) 3102 ipv6_mc_destroy_dev(idev); 3103 else 3104 ipv6_mc_down(idev); 3105 3106 idev->tstamp = jiffies; 3107 3108 /* Last: Shot the device (if unregistered) */ 3109 if (how) { 3110 addrconf_sysctl_unregister(idev); 3111 neigh_parms_release(&nd_tbl, idev->nd_parms); 3112 neigh_ifdown(&nd_tbl, dev); 3113 in6_dev_put(idev); 3114 } 3115 return 0; 3116 } 3117 3118 static void addrconf_rs_timer(unsigned long data) 3119 { 3120 struct inet6_dev *idev = (struct inet6_dev *)data; 3121 struct in6_addr lladdr; 3122 3123 write_lock(&idev->lock); 3124 if (idev->dead || !(idev->if_flags & IF_READY)) 3125 goto out; 3126 3127 if (!ipv6_accept_ra(idev)) 3128 goto out; 3129 3130 /* Announcement received after solicitation was sent */ 3131 if (idev->if_flags & IF_RA_RCVD) 3132 goto out; 3133 3134 if (idev->rs_probes++ < idev->cnf.rtr_solicits) { 3135 if (!__ipv6_get_lladdr(idev, &lladdr, IFA_F_TENTATIVE)) 3136 ndisc_send_rs(idev->dev, &lladdr, 3137 &in6addr_linklocal_allrouters); 3138 else 3139 goto out; 3140 3141 /* The wait after the last probe can be shorter */ 3142 addrconf_mod_rs_timer(idev, (idev->rs_probes == 3143 idev->cnf.rtr_solicits) ? 3144 idev->cnf.rtr_solicit_delay : 3145 idev->cnf.rtr_solicit_interval); 3146 } else { 3147 /* 3148 * Note: we do not support deprecated "all on-link" 3149 * assumption any longer. 3150 */ 3151 pr_debug("%s: no IPv6 routers present\n", idev->dev->name); 3152 } 3153 3154 out: 3155 write_unlock(&idev->lock); 3156 in6_dev_put(idev); 3157 } 3158 3159 /* 3160 * Duplicate Address Detection 3161 */ 3162 static void addrconf_dad_kick(struct inet6_ifaddr *ifp) 3163 { 3164 unsigned long rand_num; 3165 struct inet6_dev *idev = ifp->idev; 3166 3167 if (ifp->flags & IFA_F_OPTIMISTIC) 3168 rand_num = 0; 3169 else 3170 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1); 3171 3172 ifp->dad_probes = idev->cnf.dad_transmits; 3173 addrconf_mod_dad_timer(ifp, rand_num); 3174 } 3175 3176 static void addrconf_dad_start(struct inet6_ifaddr *ifp) 3177 { 3178 struct inet6_dev *idev = ifp->idev; 3179 struct net_device *dev = idev->dev; 3180 3181 addrconf_join_solict(dev, &ifp->addr); 3182 3183 net_srandom(ifp->addr.s6_addr32[3]); 3184 3185 read_lock_bh(&idev->lock); 3186 spin_lock(&ifp->lock); 3187 if (ifp->state == INET6_IFADDR_STATE_DEAD) 3188 goto out; 3189 3190 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) || 3191 idev->cnf.accept_dad < 1 || 3192 !(ifp->flags&IFA_F_TENTATIVE) || 3193 ifp->flags & IFA_F_NODAD) { 3194 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED); 3195 spin_unlock(&ifp->lock); 3196 read_unlock_bh(&idev->lock); 3197 3198 addrconf_dad_completed(ifp); 3199 return; 3200 } 3201 3202 if (!(idev->if_flags & IF_READY)) { 3203 spin_unlock(&ifp->lock); 3204 read_unlock_bh(&idev->lock); 3205 /* 3206 * If the device is not ready: 3207 * - keep it tentative if it is a permanent address. 3208 * - otherwise, kill it. 3209 */ 3210 in6_ifa_hold(ifp); 3211 addrconf_dad_stop(ifp, 0); 3212 return; 3213 } 3214 3215 /* 3216 * Optimistic nodes can start receiving 3217 * Frames right away 3218 */ 3219 if (ifp->flags & IFA_F_OPTIMISTIC) 3220 ip6_ins_rt(ifp->rt); 3221 3222 addrconf_dad_kick(ifp); 3223 out: 3224 spin_unlock(&ifp->lock); 3225 read_unlock_bh(&idev->lock); 3226 } 3227 3228 static void addrconf_dad_timer(unsigned long data) 3229 { 3230 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data; 3231 struct inet6_dev *idev = ifp->idev; 3232 struct in6_addr mcaddr; 3233 3234 if (!ifp->dad_probes && addrconf_dad_end(ifp)) 3235 goto out; 3236 3237 write_lock(&idev->lock); 3238 if (idev->dead || !(idev->if_flags & IF_READY)) { 3239 write_unlock(&idev->lock); 3240 goto out; 3241 } 3242 3243 spin_lock(&ifp->lock); 3244 if (ifp->state == INET6_IFADDR_STATE_DEAD) { 3245 spin_unlock(&ifp->lock); 3246 write_unlock(&idev->lock); 3247 goto out; 3248 } 3249 3250 if (ifp->dad_probes == 0) { 3251 /* 3252 * DAD was successful 3253 */ 3254 3255 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED); 3256 spin_unlock(&ifp->lock); 3257 write_unlock(&idev->lock); 3258 3259 addrconf_dad_completed(ifp); 3260 3261 goto out; 3262 } 3263 3264 ifp->dad_probes--; 3265 addrconf_mod_dad_timer(ifp, ifp->idev->nd_parms->retrans_time); 3266 spin_unlock(&ifp->lock); 3267 write_unlock(&idev->lock); 3268 3269 /* send a neighbour solicitation for our addr */ 3270 addrconf_addr_solict_mult(&ifp->addr, &mcaddr); 3271 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &in6addr_any); 3272 out: 3273 in6_ifa_put(ifp); 3274 } 3275 3276 static void addrconf_dad_completed(struct inet6_ifaddr *ifp) 3277 { 3278 struct net_device *dev = ifp->idev->dev; 3279 struct in6_addr lladdr; 3280 bool send_rs, send_mld; 3281 3282 addrconf_del_dad_timer(ifp); 3283 3284 /* 3285 * Configure the address for reception. Now it is valid. 3286 */ 3287 3288 ipv6_ifa_notify(RTM_NEWADDR, ifp); 3289 3290 /* If added prefix is link local and we are prepared to process 3291 router advertisements, start sending router solicitations. 3292 */ 3293 3294 read_lock_bh(&ifp->idev->lock); 3295 spin_lock(&ifp->lock); 3296 send_mld = ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL && 3297 ifp->idev->valid_ll_addr_cnt == 1; 3298 send_rs = send_mld && 3299 ipv6_accept_ra(ifp->idev) && 3300 ifp->idev->cnf.rtr_solicits > 0 && 3301 (dev->flags&IFF_LOOPBACK) == 0; 3302 spin_unlock(&ifp->lock); 3303 read_unlock_bh(&ifp->idev->lock); 3304 3305 /* While dad is in progress mld report's source address is in6_addrany. 3306 * Resend with proper ll now. 3307 */ 3308 if (send_mld) 3309 ipv6_mc_dad_complete(ifp->idev); 3310 3311 if (send_rs) { 3312 /* 3313 * If a host as already performed a random delay 3314 * [...] as part of DAD [...] there is no need 3315 * to delay again before sending the first RS 3316 */ 3317 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE)) 3318 return; 3319 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters); 3320 3321 write_lock_bh(&ifp->idev->lock); 3322 spin_lock(&ifp->lock); 3323 ifp->idev->rs_probes = 1; 3324 ifp->idev->if_flags |= IF_RS_SENT; 3325 addrconf_mod_rs_timer(ifp->idev, 3326 ifp->idev->cnf.rtr_solicit_interval); 3327 spin_unlock(&ifp->lock); 3328 write_unlock_bh(&ifp->idev->lock); 3329 } 3330 } 3331 3332 static void addrconf_dad_run(struct inet6_dev *idev) 3333 { 3334 struct inet6_ifaddr *ifp; 3335 3336 read_lock_bh(&idev->lock); 3337 list_for_each_entry(ifp, &idev->addr_list, if_list) { 3338 spin_lock(&ifp->lock); 3339 if (ifp->flags & IFA_F_TENTATIVE && 3340 ifp->state == INET6_IFADDR_STATE_DAD) 3341 addrconf_dad_kick(ifp); 3342 spin_unlock(&ifp->lock); 3343 } 3344 read_unlock_bh(&idev->lock); 3345 } 3346 3347 #ifdef CONFIG_PROC_FS 3348 struct if6_iter_state { 3349 struct seq_net_private p; 3350 int bucket; 3351 int offset; 3352 }; 3353 3354 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos) 3355 { 3356 struct inet6_ifaddr *ifa = NULL; 3357 struct if6_iter_state *state = seq->private; 3358 struct net *net = seq_file_net(seq); 3359 int p = 0; 3360 3361 /* initial bucket if pos is 0 */ 3362 if (pos == 0) { 3363 state->bucket = 0; 3364 state->offset = 0; 3365 } 3366 3367 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) { 3368 hlist_for_each_entry_rcu_bh(ifa, &inet6_addr_lst[state->bucket], 3369 addr_lst) { 3370 if (!net_eq(dev_net(ifa->idev->dev), net)) 3371 continue; 3372 /* sync with offset */ 3373 if (p < state->offset) { 3374 p++; 3375 continue; 3376 } 3377 state->offset++; 3378 return ifa; 3379 } 3380 3381 /* prepare for next bucket */ 3382 state->offset = 0; 3383 p = 0; 3384 } 3385 return NULL; 3386 } 3387 3388 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, 3389 struct inet6_ifaddr *ifa) 3390 { 3391 struct if6_iter_state *state = seq->private; 3392 struct net *net = seq_file_net(seq); 3393 3394 hlist_for_each_entry_continue_rcu_bh(ifa, addr_lst) { 3395 if (!net_eq(dev_net(ifa->idev->dev), net)) 3396 continue; 3397 state->offset++; 3398 return ifa; 3399 } 3400 3401 while (++state->bucket < IN6_ADDR_HSIZE) { 3402 state->offset = 0; 3403 hlist_for_each_entry_rcu_bh(ifa, 3404 &inet6_addr_lst[state->bucket], addr_lst) { 3405 if (!net_eq(dev_net(ifa->idev->dev), net)) 3406 continue; 3407 state->offset++; 3408 return ifa; 3409 } 3410 } 3411 3412 return NULL; 3413 } 3414 3415 static void *if6_seq_start(struct seq_file *seq, loff_t *pos) 3416 __acquires(rcu_bh) 3417 { 3418 rcu_read_lock_bh(); 3419 return if6_get_first(seq, *pos); 3420 } 3421 3422 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos) 3423 { 3424 struct inet6_ifaddr *ifa; 3425 3426 ifa = if6_get_next(seq, v); 3427 ++*pos; 3428 return ifa; 3429 } 3430 3431 static void if6_seq_stop(struct seq_file *seq, void *v) 3432 __releases(rcu_bh) 3433 { 3434 rcu_read_unlock_bh(); 3435 } 3436 3437 static int if6_seq_show(struct seq_file *seq, void *v) 3438 { 3439 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v; 3440 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n", 3441 &ifp->addr, 3442 ifp->idev->dev->ifindex, 3443 ifp->prefix_len, 3444 ifp->scope, 3445 ifp->flags, 3446 ifp->idev->dev->name); 3447 return 0; 3448 } 3449 3450 static const struct seq_operations if6_seq_ops = { 3451 .start = if6_seq_start, 3452 .next = if6_seq_next, 3453 .show = if6_seq_show, 3454 .stop = if6_seq_stop, 3455 }; 3456 3457 static int if6_seq_open(struct inode *inode, struct file *file) 3458 { 3459 return seq_open_net(inode, file, &if6_seq_ops, 3460 sizeof(struct if6_iter_state)); 3461 } 3462 3463 static const struct file_operations if6_fops = { 3464 .owner = THIS_MODULE, 3465 .open = if6_seq_open, 3466 .read = seq_read, 3467 .llseek = seq_lseek, 3468 .release = seq_release_net, 3469 }; 3470 3471 static int __net_init if6_proc_net_init(struct net *net) 3472 { 3473 if (!proc_create("if_inet6", S_IRUGO, net->proc_net, &if6_fops)) 3474 return -ENOMEM; 3475 return 0; 3476 } 3477 3478 static void __net_exit if6_proc_net_exit(struct net *net) 3479 { 3480 remove_proc_entry("if_inet6", net->proc_net); 3481 } 3482 3483 static struct pernet_operations if6_proc_net_ops = { 3484 .init = if6_proc_net_init, 3485 .exit = if6_proc_net_exit, 3486 }; 3487 3488 int __init if6_proc_init(void) 3489 { 3490 return register_pernet_subsys(&if6_proc_net_ops); 3491 } 3492 3493 void if6_proc_exit(void) 3494 { 3495 unregister_pernet_subsys(&if6_proc_net_ops); 3496 } 3497 #endif /* CONFIG_PROC_FS */ 3498 3499 #if IS_ENABLED(CONFIG_IPV6_MIP6) 3500 /* Check if address is a home address configured on any interface. */ 3501 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr) 3502 { 3503 int ret = 0; 3504 struct inet6_ifaddr *ifp = NULL; 3505 unsigned int hash = inet6_addr_hash(addr); 3506 3507 rcu_read_lock_bh(); 3508 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) { 3509 if (!net_eq(dev_net(ifp->idev->dev), net)) 3510 continue; 3511 if (ipv6_addr_equal(&ifp->addr, addr) && 3512 (ifp->flags & IFA_F_HOMEADDRESS)) { 3513 ret = 1; 3514 break; 3515 } 3516 } 3517 rcu_read_unlock_bh(); 3518 return ret; 3519 } 3520 #endif 3521 3522 /* 3523 * Periodic address status verification 3524 */ 3525 3526 static void addrconf_verify(unsigned long foo) 3527 { 3528 unsigned long now, next, next_sec, next_sched; 3529 struct inet6_ifaddr *ifp; 3530 int i; 3531 3532 rcu_read_lock_bh(); 3533 spin_lock(&addrconf_verify_lock); 3534 now = jiffies; 3535 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY); 3536 3537 del_timer(&addr_chk_timer); 3538 3539 for (i = 0; i < IN6_ADDR_HSIZE; i++) { 3540 restart: 3541 hlist_for_each_entry_rcu_bh(ifp, 3542 &inet6_addr_lst[i], addr_lst) { 3543 unsigned long age; 3544 3545 if (ifp->flags & IFA_F_PERMANENT) 3546 continue; 3547 3548 spin_lock(&ifp->lock); 3549 /* We try to batch several events at once. */ 3550 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ; 3551 3552 if (ifp->valid_lft != INFINITY_LIFE_TIME && 3553 age >= ifp->valid_lft) { 3554 spin_unlock(&ifp->lock); 3555 in6_ifa_hold(ifp); 3556 ipv6_del_addr(ifp); 3557 goto restart; 3558 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) { 3559 spin_unlock(&ifp->lock); 3560 continue; 3561 } else if (age >= ifp->prefered_lft) { 3562 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */ 3563 int deprecate = 0; 3564 3565 if (!(ifp->flags&IFA_F_DEPRECATED)) { 3566 deprecate = 1; 3567 ifp->flags |= IFA_F_DEPRECATED; 3568 } 3569 3570 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next)) 3571 next = ifp->tstamp + ifp->valid_lft * HZ; 3572 3573 spin_unlock(&ifp->lock); 3574 3575 if (deprecate) { 3576 in6_ifa_hold(ifp); 3577 3578 ipv6_ifa_notify(0, ifp); 3579 in6_ifa_put(ifp); 3580 goto restart; 3581 } 3582 #ifdef CONFIG_IPV6_PRIVACY 3583 } else if ((ifp->flags&IFA_F_TEMPORARY) && 3584 !(ifp->flags&IFA_F_TENTATIVE)) { 3585 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry * 3586 ifp->idev->cnf.dad_transmits * 3587 ifp->idev->nd_parms->retrans_time / HZ; 3588 3589 if (age >= ifp->prefered_lft - regen_advance) { 3590 struct inet6_ifaddr *ifpub = ifp->ifpub; 3591 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 3592 next = ifp->tstamp + ifp->prefered_lft * HZ; 3593 if (!ifp->regen_count && ifpub) { 3594 ifp->regen_count++; 3595 in6_ifa_hold(ifp); 3596 in6_ifa_hold(ifpub); 3597 spin_unlock(&ifp->lock); 3598 3599 spin_lock(&ifpub->lock); 3600 ifpub->regen_count = 0; 3601 spin_unlock(&ifpub->lock); 3602 ipv6_create_tempaddr(ifpub, ifp); 3603 in6_ifa_put(ifpub); 3604 in6_ifa_put(ifp); 3605 goto restart; 3606 } 3607 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next)) 3608 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ; 3609 spin_unlock(&ifp->lock); 3610 #endif 3611 } else { 3612 /* ifp->prefered_lft <= ifp->valid_lft */ 3613 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 3614 next = ifp->tstamp + ifp->prefered_lft * HZ; 3615 spin_unlock(&ifp->lock); 3616 } 3617 } 3618 } 3619 3620 next_sec = round_jiffies_up(next); 3621 next_sched = next; 3622 3623 /* If rounded timeout is accurate enough, accept it. */ 3624 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ)) 3625 next_sched = next_sec; 3626 3627 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */ 3628 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX)) 3629 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX; 3630 3631 ADBG((KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n", 3632 now, next, next_sec, next_sched)); 3633 3634 addr_chk_timer.expires = next_sched; 3635 add_timer(&addr_chk_timer); 3636 spin_unlock(&addrconf_verify_lock); 3637 rcu_read_unlock_bh(); 3638 } 3639 3640 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local, 3641 struct in6_addr **peer_pfx) 3642 { 3643 struct in6_addr *pfx = NULL; 3644 3645 *peer_pfx = NULL; 3646 3647 if (addr) 3648 pfx = nla_data(addr); 3649 3650 if (local) { 3651 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx))) 3652 *peer_pfx = pfx; 3653 pfx = nla_data(local); 3654 } 3655 3656 return pfx; 3657 } 3658 3659 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = { 3660 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) }, 3661 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) }, 3662 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) }, 3663 }; 3664 3665 static int 3666 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh) 3667 { 3668 struct net *net = sock_net(skb->sk); 3669 struct ifaddrmsg *ifm; 3670 struct nlattr *tb[IFA_MAX+1]; 3671 struct in6_addr *pfx, *peer_pfx; 3672 int err; 3673 3674 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy); 3675 if (err < 0) 3676 return err; 3677 3678 ifm = nlmsg_data(nlh); 3679 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx); 3680 if (pfx == NULL) 3681 return -EINVAL; 3682 3683 return inet6_addr_del(net, ifm->ifa_index, pfx, ifm->ifa_prefixlen); 3684 } 3685 3686 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags, 3687 u32 prefered_lft, u32 valid_lft) 3688 { 3689 u32 flags; 3690 clock_t expires; 3691 unsigned long timeout; 3692 3693 if (!valid_lft || (prefered_lft > valid_lft)) 3694 return -EINVAL; 3695 3696 timeout = addrconf_timeout_fixup(valid_lft, HZ); 3697 if (addrconf_finite_timeout(timeout)) { 3698 expires = jiffies_to_clock_t(timeout * HZ); 3699 valid_lft = timeout; 3700 flags = RTF_EXPIRES; 3701 } else { 3702 expires = 0; 3703 flags = 0; 3704 ifa_flags |= IFA_F_PERMANENT; 3705 } 3706 3707 timeout = addrconf_timeout_fixup(prefered_lft, HZ); 3708 if (addrconf_finite_timeout(timeout)) { 3709 if (timeout == 0) 3710 ifa_flags |= IFA_F_DEPRECATED; 3711 prefered_lft = timeout; 3712 } 3713 3714 spin_lock_bh(&ifp->lock); 3715 ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags; 3716 ifp->tstamp = jiffies; 3717 ifp->valid_lft = valid_lft; 3718 ifp->prefered_lft = prefered_lft; 3719 3720 spin_unlock_bh(&ifp->lock); 3721 if (!(ifp->flags&IFA_F_TENTATIVE)) 3722 ipv6_ifa_notify(0, ifp); 3723 3724 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev, 3725 expires, flags); 3726 addrconf_verify(0); 3727 3728 return 0; 3729 } 3730 3731 static int 3732 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh) 3733 { 3734 struct net *net = sock_net(skb->sk); 3735 struct ifaddrmsg *ifm; 3736 struct nlattr *tb[IFA_MAX+1]; 3737 struct in6_addr *pfx, *peer_pfx; 3738 struct inet6_ifaddr *ifa; 3739 struct net_device *dev; 3740 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME; 3741 u8 ifa_flags; 3742 int err; 3743 3744 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy); 3745 if (err < 0) 3746 return err; 3747 3748 ifm = nlmsg_data(nlh); 3749 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx); 3750 if (pfx == NULL) 3751 return -EINVAL; 3752 3753 if (tb[IFA_CACHEINFO]) { 3754 struct ifa_cacheinfo *ci; 3755 3756 ci = nla_data(tb[IFA_CACHEINFO]); 3757 valid_lft = ci->ifa_valid; 3758 preferred_lft = ci->ifa_prefered; 3759 } else { 3760 preferred_lft = INFINITY_LIFE_TIME; 3761 valid_lft = INFINITY_LIFE_TIME; 3762 } 3763 3764 dev = __dev_get_by_index(net, ifm->ifa_index); 3765 if (dev == NULL) 3766 return -ENODEV; 3767 3768 /* We ignore other flags so far. */ 3769 ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS); 3770 3771 ifa = ipv6_get_ifaddr(net, pfx, dev, 1); 3772 if (ifa == NULL) { 3773 /* 3774 * It would be best to check for !NLM_F_CREATE here but 3775 * userspace alreay relies on not having to provide this. 3776 */ 3777 return inet6_addr_add(net, ifm->ifa_index, pfx, peer_pfx, 3778 ifm->ifa_prefixlen, ifa_flags, 3779 preferred_lft, valid_lft); 3780 } 3781 3782 if (nlh->nlmsg_flags & NLM_F_EXCL || 3783 !(nlh->nlmsg_flags & NLM_F_REPLACE)) 3784 err = -EEXIST; 3785 else 3786 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft); 3787 3788 in6_ifa_put(ifa); 3789 3790 return err; 3791 } 3792 3793 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags, 3794 u8 scope, int ifindex) 3795 { 3796 struct ifaddrmsg *ifm; 3797 3798 ifm = nlmsg_data(nlh); 3799 ifm->ifa_family = AF_INET6; 3800 ifm->ifa_prefixlen = prefixlen; 3801 ifm->ifa_flags = flags; 3802 ifm->ifa_scope = scope; 3803 ifm->ifa_index = ifindex; 3804 } 3805 3806 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp, 3807 unsigned long tstamp, u32 preferred, u32 valid) 3808 { 3809 struct ifa_cacheinfo ci; 3810 3811 ci.cstamp = cstamp_delta(cstamp); 3812 ci.tstamp = cstamp_delta(tstamp); 3813 ci.ifa_prefered = preferred; 3814 ci.ifa_valid = valid; 3815 3816 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci); 3817 } 3818 3819 static inline int rt_scope(int ifa_scope) 3820 { 3821 if (ifa_scope & IFA_HOST) 3822 return RT_SCOPE_HOST; 3823 else if (ifa_scope & IFA_LINK) 3824 return RT_SCOPE_LINK; 3825 else if (ifa_scope & IFA_SITE) 3826 return RT_SCOPE_SITE; 3827 else 3828 return RT_SCOPE_UNIVERSE; 3829 } 3830 3831 static inline int inet6_ifaddr_msgsize(void) 3832 { 3833 return NLMSG_ALIGN(sizeof(struct ifaddrmsg)) 3834 + nla_total_size(16) /* IFA_LOCAL */ 3835 + nla_total_size(16) /* IFA_ADDRESS */ 3836 + nla_total_size(sizeof(struct ifa_cacheinfo)); 3837 } 3838 3839 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa, 3840 u32 portid, u32 seq, int event, unsigned int flags) 3841 { 3842 struct nlmsghdr *nlh; 3843 u32 preferred, valid; 3844 3845 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags); 3846 if (nlh == NULL) 3847 return -EMSGSIZE; 3848 3849 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope), 3850 ifa->idev->dev->ifindex); 3851 3852 if (!(ifa->flags&IFA_F_PERMANENT)) { 3853 preferred = ifa->prefered_lft; 3854 valid = ifa->valid_lft; 3855 if (preferred != INFINITY_LIFE_TIME) { 3856 long tval = (jiffies - ifa->tstamp)/HZ; 3857 if (preferred > tval) 3858 preferred -= tval; 3859 else 3860 preferred = 0; 3861 if (valid != INFINITY_LIFE_TIME) { 3862 if (valid > tval) 3863 valid -= tval; 3864 else 3865 valid = 0; 3866 } 3867 } 3868 } else { 3869 preferred = INFINITY_LIFE_TIME; 3870 valid = INFINITY_LIFE_TIME; 3871 } 3872 3873 if (!ipv6_addr_any(&ifa->peer_addr)) { 3874 if (nla_put(skb, IFA_LOCAL, 16, &ifa->addr) < 0 || 3875 nla_put(skb, IFA_ADDRESS, 16, &ifa->peer_addr) < 0) 3876 goto error; 3877 } else 3878 if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0) 3879 goto error; 3880 3881 if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) 3882 goto error; 3883 3884 return nlmsg_end(skb, nlh); 3885 3886 error: 3887 nlmsg_cancel(skb, nlh); 3888 return -EMSGSIZE; 3889 } 3890 3891 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca, 3892 u32 portid, u32 seq, int event, u16 flags) 3893 { 3894 struct nlmsghdr *nlh; 3895 u8 scope = RT_SCOPE_UNIVERSE; 3896 int ifindex = ifmca->idev->dev->ifindex; 3897 3898 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE) 3899 scope = RT_SCOPE_SITE; 3900 3901 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags); 3902 if (nlh == NULL) 3903 return -EMSGSIZE; 3904 3905 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 3906 if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 || 3907 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp, 3908 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 3909 nlmsg_cancel(skb, nlh); 3910 return -EMSGSIZE; 3911 } 3912 3913 return nlmsg_end(skb, nlh); 3914 } 3915 3916 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca, 3917 u32 portid, u32 seq, int event, unsigned int flags) 3918 { 3919 struct nlmsghdr *nlh; 3920 u8 scope = RT_SCOPE_UNIVERSE; 3921 int ifindex = ifaca->aca_idev->dev->ifindex; 3922 3923 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE) 3924 scope = RT_SCOPE_SITE; 3925 3926 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags); 3927 if (nlh == NULL) 3928 return -EMSGSIZE; 3929 3930 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 3931 if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 || 3932 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp, 3933 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 3934 nlmsg_cancel(skb, nlh); 3935 return -EMSGSIZE; 3936 } 3937 3938 return nlmsg_end(skb, nlh); 3939 } 3940 3941 enum addr_type_t { 3942 UNICAST_ADDR, 3943 MULTICAST_ADDR, 3944 ANYCAST_ADDR, 3945 }; 3946 3947 /* called with rcu_read_lock() */ 3948 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb, 3949 struct netlink_callback *cb, enum addr_type_t type, 3950 int s_ip_idx, int *p_ip_idx) 3951 { 3952 struct ifmcaddr6 *ifmca; 3953 struct ifacaddr6 *ifaca; 3954 int err = 1; 3955 int ip_idx = *p_ip_idx; 3956 3957 read_lock_bh(&idev->lock); 3958 switch (type) { 3959 case UNICAST_ADDR: { 3960 struct inet6_ifaddr *ifa; 3961 3962 /* unicast address incl. temp addr */ 3963 list_for_each_entry(ifa, &idev->addr_list, if_list) { 3964 if (++ip_idx < s_ip_idx) 3965 continue; 3966 err = inet6_fill_ifaddr(skb, ifa, 3967 NETLINK_CB(cb->skb).portid, 3968 cb->nlh->nlmsg_seq, 3969 RTM_NEWADDR, 3970 NLM_F_MULTI); 3971 if (err <= 0) 3972 break; 3973 nl_dump_check_consistent(cb, nlmsg_hdr(skb)); 3974 } 3975 break; 3976 } 3977 case MULTICAST_ADDR: 3978 /* multicast address */ 3979 for (ifmca = idev->mc_list; ifmca; 3980 ifmca = ifmca->next, ip_idx++) { 3981 if (ip_idx < s_ip_idx) 3982 continue; 3983 err = inet6_fill_ifmcaddr(skb, ifmca, 3984 NETLINK_CB(cb->skb).portid, 3985 cb->nlh->nlmsg_seq, 3986 RTM_GETMULTICAST, 3987 NLM_F_MULTI); 3988 if (err <= 0) 3989 break; 3990 } 3991 break; 3992 case ANYCAST_ADDR: 3993 /* anycast address */ 3994 for (ifaca = idev->ac_list; ifaca; 3995 ifaca = ifaca->aca_next, ip_idx++) { 3996 if (ip_idx < s_ip_idx) 3997 continue; 3998 err = inet6_fill_ifacaddr(skb, ifaca, 3999 NETLINK_CB(cb->skb).portid, 4000 cb->nlh->nlmsg_seq, 4001 RTM_GETANYCAST, 4002 NLM_F_MULTI); 4003 if (err <= 0) 4004 break; 4005 } 4006 break; 4007 default: 4008 break; 4009 } 4010 read_unlock_bh(&idev->lock); 4011 *p_ip_idx = ip_idx; 4012 return err; 4013 } 4014 4015 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb, 4016 enum addr_type_t type) 4017 { 4018 struct net *net = sock_net(skb->sk); 4019 int h, s_h; 4020 int idx, ip_idx; 4021 int s_idx, s_ip_idx; 4022 struct net_device *dev; 4023 struct inet6_dev *idev; 4024 struct hlist_head *head; 4025 4026 s_h = cb->args[0]; 4027 s_idx = idx = cb->args[1]; 4028 s_ip_idx = ip_idx = cb->args[2]; 4029 4030 rcu_read_lock(); 4031 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ net->dev_base_seq; 4032 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 4033 idx = 0; 4034 head = &net->dev_index_head[h]; 4035 hlist_for_each_entry_rcu(dev, head, index_hlist) { 4036 if (idx < s_idx) 4037 goto cont; 4038 if (h > s_h || idx > s_idx) 4039 s_ip_idx = 0; 4040 ip_idx = 0; 4041 idev = __in6_dev_get(dev); 4042 if (!idev) 4043 goto cont; 4044 4045 if (in6_dump_addrs(idev, skb, cb, type, 4046 s_ip_idx, &ip_idx) <= 0) 4047 goto done; 4048 cont: 4049 idx++; 4050 } 4051 } 4052 done: 4053 rcu_read_unlock(); 4054 cb->args[0] = h; 4055 cb->args[1] = idx; 4056 cb->args[2] = ip_idx; 4057 4058 return skb->len; 4059 } 4060 4061 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb) 4062 { 4063 enum addr_type_t type = UNICAST_ADDR; 4064 4065 return inet6_dump_addr(skb, cb, type); 4066 } 4067 4068 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb) 4069 { 4070 enum addr_type_t type = MULTICAST_ADDR; 4071 4072 return inet6_dump_addr(skb, cb, type); 4073 } 4074 4075 4076 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb) 4077 { 4078 enum addr_type_t type = ANYCAST_ADDR; 4079 4080 return inet6_dump_addr(skb, cb, type); 4081 } 4082 4083 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh) 4084 { 4085 struct net *net = sock_net(in_skb->sk); 4086 struct ifaddrmsg *ifm; 4087 struct nlattr *tb[IFA_MAX+1]; 4088 struct in6_addr *addr = NULL, *peer; 4089 struct net_device *dev = NULL; 4090 struct inet6_ifaddr *ifa; 4091 struct sk_buff *skb; 4092 int err; 4093 4094 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy); 4095 if (err < 0) 4096 goto errout; 4097 4098 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer); 4099 if (addr == NULL) { 4100 err = -EINVAL; 4101 goto errout; 4102 } 4103 4104 ifm = nlmsg_data(nlh); 4105 if (ifm->ifa_index) 4106 dev = __dev_get_by_index(net, ifm->ifa_index); 4107 4108 ifa = ipv6_get_ifaddr(net, addr, dev, 1); 4109 if (!ifa) { 4110 err = -EADDRNOTAVAIL; 4111 goto errout; 4112 } 4113 4114 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL); 4115 if (!skb) { 4116 err = -ENOBUFS; 4117 goto errout_ifa; 4118 } 4119 4120 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).portid, 4121 nlh->nlmsg_seq, RTM_NEWADDR, 0); 4122 if (err < 0) { 4123 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 4124 WARN_ON(err == -EMSGSIZE); 4125 kfree_skb(skb); 4126 goto errout_ifa; 4127 } 4128 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid); 4129 errout_ifa: 4130 in6_ifa_put(ifa); 4131 errout: 4132 return err; 4133 } 4134 4135 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa) 4136 { 4137 struct sk_buff *skb; 4138 struct net *net = dev_net(ifa->idev->dev); 4139 int err = -ENOBUFS; 4140 4141 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC); 4142 if (skb == NULL) 4143 goto errout; 4144 4145 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0); 4146 if (err < 0) { 4147 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 4148 WARN_ON(err == -EMSGSIZE); 4149 kfree_skb(skb); 4150 goto errout; 4151 } 4152 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC); 4153 return; 4154 errout: 4155 if (err < 0) 4156 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err); 4157 } 4158 4159 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf, 4160 __s32 *array, int bytes) 4161 { 4162 BUG_ON(bytes < (DEVCONF_MAX * 4)); 4163 4164 memset(array, 0, bytes); 4165 array[DEVCONF_FORWARDING] = cnf->forwarding; 4166 array[DEVCONF_HOPLIMIT] = cnf->hop_limit; 4167 array[DEVCONF_MTU6] = cnf->mtu6; 4168 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra; 4169 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects; 4170 array[DEVCONF_AUTOCONF] = cnf->autoconf; 4171 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits; 4172 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits; 4173 array[DEVCONF_RTR_SOLICIT_INTERVAL] = 4174 jiffies_to_msecs(cnf->rtr_solicit_interval); 4175 array[DEVCONF_RTR_SOLICIT_DELAY] = 4176 jiffies_to_msecs(cnf->rtr_solicit_delay); 4177 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version; 4178 #ifdef CONFIG_IPV6_PRIVACY 4179 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr; 4180 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft; 4181 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft; 4182 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry; 4183 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor; 4184 #endif 4185 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses; 4186 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr; 4187 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo; 4188 #ifdef CONFIG_IPV6_ROUTER_PREF 4189 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref; 4190 array[DEVCONF_RTR_PROBE_INTERVAL] = 4191 jiffies_to_msecs(cnf->rtr_probe_interval); 4192 #ifdef CONFIG_IPV6_ROUTE_INFO 4193 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen; 4194 #endif 4195 #endif 4196 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp; 4197 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route; 4198 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 4199 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad; 4200 #endif 4201 #ifdef CONFIG_IPV6_MROUTE 4202 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding; 4203 #endif 4204 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6; 4205 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad; 4206 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao; 4207 array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify; 4208 } 4209 4210 static inline size_t inet6_ifla6_size(void) 4211 { 4212 return nla_total_size(4) /* IFLA_INET6_FLAGS */ 4213 + nla_total_size(sizeof(struct ifla_cacheinfo)) 4214 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */ 4215 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */ 4216 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */ 4217 + nla_total_size(sizeof(struct in6_addr)); /* IFLA_INET6_TOKEN */ 4218 } 4219 4220 static inline size_t inet6_if_nlmsg_size(void) 4221 { 4222 return NLMSG_ALIGN(sizeof(struct ifinfomsg)) 4223 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */ 4224 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */ 4225 + nla_total_size(4) /* IFLA_MTU */ 4226 + nla_total_size(4) /* IFLA_LINK */ 4227 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */ 4228 } 4229 4230 static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib, 4231 int items, int bytes) 4232 { 4233 int i; 4234 int pad = bytes - sizeof(u64) * items; 4235 BUG_ON(pad < 0); 4236 4237 /* Use put_unaligned() because stats may not be aligned for u64. */ 4238 put_unaligned(items, &stats[0]); 4239 for (i = 1; i < items; i++) 4240 put_unaligned(atomic_long_read(&mib[i]), &stats[i]); 4241 4242 memset(&stats[items], 0, pad); 4243 } 4244 4245 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu **mib, 4246 int items, int bytes, size_t syncpoff) 4247 { 4248 int i; 4249 int pad = bytes - sizeof(u64) * items; 4250 BUG_ON(pad < 0); 4251 4252 /* Use put_unaligned() because stats may not be aligned for u64. */ 4253 put_unaligned(items, &stats[0]); 4254 for (i = 1; i < items; i++) 4255 put_unaligned(snmp_fold_field64(mib, i, syncpoff), &stats[i]); 4256 4257 memset(&stats[items], 0, pad); 4258 } 4259 4260 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype, 4261 int bytes) 4262 { 4263 switch (attrtype) { 4264 case IFLA_INET6_STATS: 4265 __snmp6_fill_stats64(stats, (void __percpu **)idev->stats.ipv6, 4266 IPSTATS_MIB_MAX, bytes, offsetof(struct ipstats_mib, syncp)); 4267 break; 4268 case IFLA_INET6_ICMP6STATS: 4269 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, ICMP6_MIB_MAX, bytes); 4270 break; 4271 } 4272 } 4273 4274 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev) 4275 { 4276 struct nlattr *nla; 4277 struct ifla_cacheinfo ci; 4278 4279 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags)) 4280 goto nla_put_failure; 4281 ci.max_reasm_len = IPV6_MAXPLEN; 4282 ci.tstamp = cstamp_delta(idev->tstamp); 4283 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time); 4284 ci.retrans_time = jiffies_to_msecs(idev->nd_parms->retrans_time); 4285 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci)) 4286 goto nla_put_failure; 4287 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32)); 4288 if (nla == NULL) 4289 goto nla_put_failure; 4290 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla)); 4291 4292 /* XXX - MC not implemented */ 4293 4294 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64)); 4295 if (nla == NULL) 4296 goto nla_put_failure; 4297 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla)); 4298 4299 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64)); 4300 if (nla == NULL) 4301 goto nla_put_failure; 4302 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla)); 4303 4304 nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr)); 4305 if (nla == NULL) 4306 goto nla_put_failure; 4307 read_lock_bh(&idev->lock); 4308 memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla)); 4309 read_unlock_bh(&idev->lock); 4310 4311 return 0; 4312 4313 nla_put_failure: 4314 return -EMSGSIZE; 4315 } 4316 4317 static size_t inet6_get_link_af_size(const struct net_device *dev) 4318 { 4319 if (!__in6_dev_get(dev)) 4320 return 0; 4321 4322 return inet6_ifla6_size(); 4323 } 4324 4325 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev) 4326 { 4327 struct inet6_dev *idev = __in6_dev_get(dev); 4328 4329 if (!idev) 4330 return -ENODATA; 4331 4332 if (inet6_fill_ifla6_attrs(skb, idev) < 0) 4333 return -EMSGSIZE; 4334 4335 return 0; 4336 } 4337 4338 static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token) 4339 { 4340 struct inet6_ifaddr *ifp; 4341 struct net_device *dev = idev->dev; 4342 bool update_rs = false; 4343 4344 if (token == NULL) 4345 return -EINVAL; 4346 if (ipv6_addr_any(token)) 4347 return -EINVAL; 4348 if (dev->flags & (IFF_LOOPBACK | IFF_NOARP)) 4349 return -EINVAL; 4350 if (!ipv6_accept_ra(idev)) 4351 return -EINVAL; 4352 if (idev->cnf.rtr_solicits <= 0) 4353 return -EINVAL; 4354 4355 write_lock_bh(&idev->lock); 4356 4357 BUILD_BUG_ON(sizeof(token->s6_addr) != 16); 4358 memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8); 4359 4360 write_unlock_bh(&idev->lock); 4361 4362 if (!idev->dead && (idev->if_flags & IF_READY)) { 4363 struct in6_addr ll_addr; 4364 4365 ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE | 4366 IFA_F_OPTIMISTIC); 4367 4368 /* If we're not ready, then normal ifup will take care 4369 * of this. Otherwise, we need to request our rs here. 4370 */ 4371 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters); 4372 update_rs = true; 4373 } 4374 4375 write_lock_bh(&idev->lock); 4376 4377 if (update_rs) { 4378 idev->if_flags |= IF_RS_SENT; 4379 idev->rs_probes = 1; 4380 addrconf_mod_rs_timer(idev, idev->cnf.rtr_solicit_interval); 4381 } 4382 4383 /* Well, that's kinda nasty ... */ 4384 list_for_each_entry(ifp, &idev->addr_list, if_list) { 4385 spin_lock(&ifp->lock); 4386 if (ifp->tokenized) { 4387 ifp->valid_lft = 0; 4388 ifp->prefered_lft = 0; 4389 } 4390 spin_unlock(&ifp->lock); 4391 } 4392 4393 write_unlock_bh(&idev->lock); 4394 addrconf_verify(0); 4395 return 0; 4396 } 4397 4398 static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla) 4399 { 4400 int err = -EINVAL; 4401 struct inet6_dev *idev = __in6_dev_get(dev); 4402 struct nlattr *tb[IFLA_INET6_MAX + 1]; 4403 4404 if (!idev) 4405 return -EAFNOSUPPORT; 4406 4407 if (nla_parse_nested(tb, IFLA_INET6_MAX, nla, NULL) < 0) 4408 BUG(); 4409 4410 if (tb[IFLA_INET6_TOKEN]) 4411 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN])); 4412 4413 return err; 4414 } 4415 4416 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev, 4417 u32 portid, u32 seq, int event, unsigned int flags) 4418 { 4419 struct net_device *dev = idev->dev; 4420 struct ifinfomsg *hdr; 4421 struct nlmsghdr *nlh; 4422 void *protoinfo; 4423 4424 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags); 4425 if (nlh == NULL) 4426 return -EMSGSIZE; 4427 4428 hdr = nlmsg_data(nlh); 4429 hdr->ifi_family = AF_INET6; 4430 hdr->__ifi_pad = 0; 4431 hdr->ifi_type = dev->type; 4432 hdr->ifi_index = dev->ifindex; 4433 hdr->ifi_flags = dev_get_flags(dev); 4434 hdr->ifi_change = 0; 4435 4436 if (nla_put_string(skb, IFLA_IFNAME, dev->name) || 4437 (dev->addr_len && 4438 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) || 4439 nla_put_u32(skb, IFLA_MTU, dev->mtu) || 4440 (dev->ifindex != dev->iflink && 4441 nla_put_u32(skb, IFLA_LINK, dev->iflink))) 4442 goto nla_put_failure; 4443 protoinfo = nla_nest_start(skb, IFLA_PROTINFO); 4444 if (protoinfo == NULL) 4445 goto nla_put_failure; 4446 4447 if (inet6_fill_ifla6_attrs(skb, idev) < 0) 4448 goto nla_put_failure; 4449 4450 nla_nest_end(skb, protoinfo); 4451 return nlmsg_end(skb, nlh); 4452 4453 nla_put_failure: 4454 nlmsg_cancel(skb, nlh); 4455 return -EMSGSIZE; 4456 } 4457 4458 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb) 4459 { 4460 struct net *net = sock_net(skb->sk); 4461 int h, s_h; 4462 int idx = 0, s_idx; 4463 struct net_device *dev; 4464 struct inet6_dev *idev; 4465 struct hlist_head *head; 4466 4467 s_h = cb->args[0]; 4468 s_idx = cb->args[1]; 4469 4470 rcu_read_lock(); 4471 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 4472 idx = 0; 4473 head = &net->dev_index_head[h]; 4474 hlist_for_each_entry_rcu(dev, head, index_hlist) { 4475 if (idx < s_idx) 4476 goto cont; 4477 idev = __in6_dev_get(dev); 4478 if (!idev) 4479 goto cont; 4480 if (inet6_fill_ifinfo(skb, idev, 4481 NETLINK_CB(cb->skb).portid, 4482 cb->nlh->nlmsg_seq, 4483 RTM_NEWLINK, NLM_F_MULTI) <= 0) 4484 goto out; 4485 cont: 4486 idx++; 4487 } 4488 } 4489 out: 4490 rcu_read_unlock(); 4491 cb->args[1] = idx; 4492 cb->args[0] = h; 4493 4494 return skb->len; 4495 } 4496 4497 void inet6_ifinfo_notify(int event, struct inet6_dev *idev) 4498 { 4499 struct sk_buff *skb; 4500 struct net *net = dev_net(idev->dev); 4501 int err = -ENOBUFS; 4502 4503 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC); 4504 if (skb == NULL) 4505 goto errout; 4506 4507 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0); 4508 if (err < 0) { 4509 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */ 4510 WARN_ON(err == -EMSGSIZE); 4511 kfree_skb(skb); 4512 goto errout; 4513 } 4514 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC); 4515 return; 4516 errout: 4517 if (err < 0) 4518 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err); 4519 } 4520 4521 static inline size_t inet6_prefix_nlmsg_size(void) 4522 { 4523 return NLMSG_ALIGN(sizeof(struct prefixmsg)) 4524 + nla_total_size(sizeof(struct in6_addr)) 4525 + nla_total_size(sizeof(struct prefix_cacheinfo)); 4526 } 4527 4528 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev, 4529 struct prefix_info *pinfo, u32 portid, u32 seq, 4530 int event, unsigned int flags) 4531 { 4532 struct prefixmsg *pmsg; 4533 struct nlmsghdr *nlh; 4534 struct prefix_cacheinfo ci; 4535 4536 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags); 4537 if (nlh == NULL) 4538 return -EMSGSIZE; 4539 4540 pmsg = nlmsg_data(nlh); 4541 pmsg->prefix_family = AF_INET6; 4542 pmsg->prefix_pad1 = 0; 4543 pmsg->prefix_pad2 = 0; 4544 pmsg->prefix_ifindex = idev->dev->ifindex; 4545 pmsg->prefix_len = pinfo->prefix_len; 4546 pmsg->prefix_type = pinfo->type; 4547 pmsg->prefix_pad3 = 0; 4548 pmsg->prefix_flags = 0; 4549 if (pinfo->onlink) 4550 pmsg->prefix_flags |= IF_PREFIX_ONLINK; 4551 if (pinfo->autoconf) 4552 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF; 4553 4554 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix)) 4555 goto nla_put_failure; 4556 ci.preferred_time = ntohl(pinfo->prefered); 4557 ci.valid_time = ntohl(pinfo->valid); 4558 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci)) 4559 goto nla_put_failure; 4560 return nlmsg_end(skb, nlh); 4561 4562 nla_put_failure: 4563 nlmsg_cancel(skb, nlh); 4564 return -EMSGSIZE; 4565 } 4566 4567 static void inet6_prefix_notify(int event, struct inet6_dev *idev, 4568 struct prefix_info *pinfo) 4569 { 4570 struct sk_buff *skb; 4571 struct net *net = dev_net(idev->dev); 4572 int err = -ENOBUFS; 4573 4574 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC); 4575 if (skb == NULL) 4576 goto errout; 4577 4578 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0); 4579 if (err < 0) { 4580 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */ 4581 WARN_ON(err == -EMSGSIZE); 4582 kfree_skb(skb); 4583 goto errout; 4584 } 4585 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC); 4586 return; 4587 errout: 4588 if (err < 0) 4589 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err); 4590 } 4591 4592 static void update_valid_ll_addr_cnt(struct inet6_ifaddr *ifp, int count) 4593 { 4594 write_lock_bh(&ifp->idev->lock); 4595 spin_lock(&ifp->lock); 4596 if (((ifp->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE|IFA_F_OPTIMISTIC| 4597 IFA_F_DADFAILED)) == IFA_F_PERMANENT) && 4598 (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) 4599 ifp->idev->valid_ll_addr_cnt += count; 4600 WARN_ON(ifp->idev->valid_ll_addr_cnt < 0); 4601 spin_unlock(&ifp->lock); 4602 write_unlock_bh(&ifp->idev->lock); 4603 } 4604 4605 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 4606 { 4607 struct net *net = dev_net(ifp->idev->dev); 4608 4609 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp); 4610 4611 switch (event) { 4612 case RTM_NEWADDR: 4613 update_valid_ll_addr_cnt(ifp, 1); 4614 4615 /* 4616 * If the address was optimistic 4617 * we inserted the route at the start of 4618 * our DAD process, so we don't need 4619 * to do it again 4620 */ 4621 if (!(ifp->rt->rt6i_node)) 4622 ip6_ins_rt(ifp->rt); 4623 if (ifp->idev->cnf.forwarding) 4624 addrconf_join_anycast(ifp); 4625 if (!ipv6_addr_any(&ifp->peer_addr)) 4626 addrconf_prefix_route(&ifp->peer_addr, 128, 4627 ifp->idev->dev, 0, 0); 4628 break; 4629 case RTM_DELADDR: 4630 update_valid_ll_addr_cnt(ifp, -1); 4631 4632 if (ifp->idev->cnf.forwarding) 4633 addrconf_leave_anycast(ifp); 4634 addrconf_leave_solict(ifp->idev, &ifp->addr); 4635 if (!ipv6_addr_any(&ifp->peer_addr)) { 4636 struct rt6_info *rt; 4637 struct net_device *dev = ifp->idev->dev; 4638 4639 rt = rt6_lookup(dev_net(dev), &ifp->peer_addr, NULL, 4640 dev->ifindex, 1); 4641 if (rt) { 4642 dst_hold(&rt->dst); 4643 if (ip6_del_rt(rt)) 4644 dst_free(&rt->dst); 4645 } 4646 } 4647 dst_hold(&ifp->rt->dst); 4648 4649 if (ip6_del_rt(ifp->rt)) 4650 dst_free(&ifp->rt->dst); 4651 break; 4652 } 4653 atomic_inc(&net->ipv6.dev_addr_genid); 4654 } 4655 4656 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 4657 { 4658 rcu_read_lock_bh(); 4659 if (likely(ifp->idev->dead == 0)) 4660 __ipv6_ifa_notify(event, ifp); 4661 rcu_read_unlock_bh(); 4662 } 4663 4664 #ifdef CONFIG_SYSCTL 4665 4666 static 4667 int addrconf_sysctl_forward(struct ctl_table *ctl, int write, 4668 void __user *buffer, size_t *lenp, loff_t *ppos) 4669 { 4670 int *valp = ctl->data; 4671 int val = *valp; 4672 loff_t pos = *ppos; 4673 struct ctl_table lctl; 4674 int ret; 4675 4676 /* 4677 * ctl->data points to idev->cnf.forwarding, we should 4678 * not modify it until we get the rtnl lock. 4679 */ 4680 lctl = *ctl; 4681 lctl.data = &val; 4682 4683 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 4684 4685 if (write) 4686 ret = addrconf_fixup_forwarding(ctl, valp, val); 4687 if (ret) 4688 *ppos = pos; 4689 return ret; 4690 } 4691 4692 static void dev_disable_change(struct inet6_dev *idev) 4693 { 4694 struct netdev_notifier_info info; 4695 4696 if (!idev || !idev->dev) 4697 return; 4698 4699 netdev_notifier_info_init(&info, idev->dev); 4700 if (idev->cnf.disable_ipv6) 4701 addrconf_notify(NULL, NETDEV_DOWN, &info); 4702 else 4703 addrconf_notify(NULL, NETDEV_UP, &info); 4704 } 4705 4706 static void addrconf_disable_change(struct net *net, __s32 newf) 4707 { 4708 struct net_device *dev; 4709 struct inet6_dev *idev; 4710 4711 rcu_read_lock(); 4712 for_each_netdev_rcu(net, dev) { 4713 idev = __in6_dev_get(dev); 4714 if (idev) { 4715 int changed = (!idev->cnf.disable_ipv6) ^ (!newf); 4716 idev->cnf.disable_ipv6 = newf; 4717 if (changed) 4718 dev_disable_change(idev); 4719 } 4720 } 4721 rcu_read_unlock(); 4722 } 4723 4724 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf) 4725 { 4726 struct net *net; 4727 int old; 4728 4729 if (!rtnl_trylock()) 4730 return restart_syscall(); 4731 4732 net = (struct net *)table->extra2; 4733 old = *p; 4734 *p = newf; 4735 4736 if (p == &net->ipv6.devconf_dflt->disable_ipv6) { 4737 rtnl_unlock(); 4738 return 0; 4739 } 4740 4741 if (p == &net->ipv6.devconf_all->disable_ipv6) { 4742 net->ipv6.devconf_dflt->disable_ipv6 = newf; 4743 addrconf_disable_change(net, newf); 4744 } else if ((!newf) ^ (!old)) 4745 dev_disable_change((struct inet6_dev *)table->extra1); 4746 4747 rtnl_unlock(); 4748 return 0; 4749 } 4750 4751 static 4752 int addrconf_sysctl_disable(struct ctl_table *ctl, int write, 4753 void __user *buffer, size_t *lenp, loff_t *ppos) 4754 { 4755 int *valp = ctl->data; 4756 int val = *valp; 4757 loff_t pos = *ppos; 4758 struct ctl_table lctl; 4759 int ret; 4760 4761 /* 4762 * ctl->data points to idev->cnf.disable_ipv6, we should 4763 * not modify it until we get the rtnl lock. 4764 */ 4765 lctl = *ctl; 4766 lctl.data = &val; 4767 4768 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 4769 4770 if (write) 4771 ret = addrconf_disable_ipv6(ctl, valp, val); 4772 if (ret) 4773 *ppos = pos; 4774 return ret; 4775 } 4776 4777 static struct addrconf_sysctl_table 4778 { 4779 struct ctl_table_header *sysctl_header; 4780 struct ctl_table addrconf_vars[DEVCONF_MAX+1]; 4781 } addrconf_sysctl __read_mostly = { 4782 .sysctl_header = NULL, 4783 .addrconf_vars = { 4784 { 4785 .procname = "forwarding", 4786 .data = &ipv6_devconf.forwarding, 4787 .maxlen = sizeof(int), 4788 .mode = 0644, 4789 .proc_handler = addrconf_sysctl_forward, 4790 }, 4791 { 4792 .procname = "hop_limit", 4793 .data = &ipv6_devconf.hop_limit, 4794 .maxlen = sizeof(int), 4795 .mode = 0644, 4796 .proc_handler = proc_dointvec, 4797 }, 4798 { 4799 .procname = "mtu", 4800 .data = &ipv6_devconf.mtu6, 4801 .maxlen = sizeof(int), 4802 .mode = 0644, 4803 .proc_handler = proc_dointvec, 4804 }, 4805 { 4806 .procname = "accept_ra", 4807 .data = &ipv6_devconf.accept_ra, 4808 .maxlen = sizeof(int), 4809 .mode = 0644, 4810 .proc_handler = proc_dointvec, 4811 }, 4812 { 4813 .procname = "accept_redirects", 4814 .data = &ipv6_devconf.accept_redirects, 4815 .maxlen = sizeof(int), 4816 .mode = 0644, 4817 .proc_handler = proc_dointvec, 4818 }, 4819 { 4820 .procname = "autoconf", 4821 .data = &ipv6_devconf.autoconf, 4822 .maxlen = sizeof(int), 4823 .mode = 0644, 4824 .proc_handler = proc_dointvec, 4825 }, 4826 { 4827 .procname = "dad_transmits", 4828 .data = &ipv6_devconf.dad_transmits, 4829 .maxlen = sizeof(int), 4830 .mode = 0644, 4831 .proc_handler = proc_dointvec, 4832 }, 4833 { 4834 .procname = "router_solicitations", 4835 .data = &ipv6_devconf.rtr_solicits, 4836 .maxlen = sizeof(int), 4837 .mode = 0644, 4838 .proc_handler = proc_dointvec, 4839 }, 4840 { 4841 .procname = "router_solicitation_interval", 4842 .data = &ipv6_devconf.rtr_solicit_interval, 4843 .maxlen = sizeof(int), 4844 .mode = 0644, 4845 .proc_handler = proc_dointvec_jiffies, 4846 }, 4847 { 4848 .procname = "router_solicitation_delay", 4849 .data = &ipv6_devconf.rtr_solicit_delay, 4850 .maxlen = sizeof(int), 4851 .mode = 0644, 4852 .proc_handler = proc_dointvec_jiffies, 4853 }, 4854 { 4855 .procname = "force_mld_version", 4856 .data = &ipv6_devconf.force_mld_version, 4857 .maxlen = sizeof(int), 4858 .mode = 0644, 4859 .proc_handler = proc_dointvec, 4860 }, 4861 #ifdef CONFIG_IPV6_PRIVACY 4862 { 4863 .procname = "use_tempaddr", 4864 .data = &ipv6_devconf.use_tempaddr, 4865 .maxlen = sizeof(int), 4866 .mode = 0644, 4867 .proc_handler = proc_dointvec, 4868 }, 4869 { 4870 .procname = "temp_valid_lft", 4871 .data = &ipv6_devconf.temp_valid_lft, 4872 .maxlen = sizeof(int), 4873 .mode = 0644, 4874 .proc_handler = proc_dointvec, 4875 }, 4876 { 4877 .procname = "temp_prefered_lft", 4878 .data = &ipv6_devconf.temp_prefered_lft, 4879 .maxlen = sizeof(int), 4880 .mode = 0644, 4881 .proc_handler = proc_dointvec, 4882 }, 4883 { 4884 .procname = "regen_max_retry", 4885 .data = &ipv6_devconf.regen_max_retry, 4886 .maxlen = sizeof(int), 4887 .mode = 0644, 4888 .proc_handler = proc_dointvec, 4889 }, 4890 { 4891 .procname = "max_desync_factor", 4892 .data = &ipv6_devconf.max_desync_factor, 4893 .maxlen = sizeof(int), 4894 .mode = 0644, 4895 .proc_handler = proc_dointvec, 4896 }, 4897 #endif 4898 { 4899 .procname = "max_addresses", 4900 .data = &ipv6_devconf.max_addresses, 4901 .maxlen = sizeof(int), 4902 .mode = 0644, 4903 .proc_handler = proc_dointvec, 4904 }, 4905 { 4906 .procname = "accept_ra_defrtr", 4907 .data = &ipv6_devconf.accept_ra_defrtr, 4908 .maxlen = sizeof(int), 4909 .mode = 0644, 4910 .proc_handler = proc_dointvec, 4911 }, 4912 { 4913 .procname = "accept_ra_pinfo", 4914 .data = &ipv6_devconf.accept_ra_pinfo, 4915 .maxlen = sizeof(int), 4916 .mode = 0644, 4917 .proc_handler = proc_dointvec, 4918 }, 4919 #ifdef CONFIG_IPV6_ROUTER_PREF 4920 { 4921 .procname = "accept_ra_rtr_pref", 4922 .data = &ipv6_devconf.accept_ra_rtr_pref, 4923 .maxlen = sizeof(int), 4924 .mode = 0644, 4925 .proc_handler = proc_dointvec, 4926 }, 4927 { 4928 .procname = "router_probe_interval", 4929 .data = &ipv6_devconf.rtr_probe_interval, 4930 .maxlen = sizeof(int), 4931 .mode = 0644, 4932 .proc_handler = proc_dointvec_jiffies, 4933 }, 4934 #ifdef CONFIG_IPV6_ROUTE_INFO 4935 { 4936 .procname = "accept_ra_rt_info_max_plen", 4937 .data = &ipv6_devconf.accept_ra_rt_info_max_plen, 4938 .maxlen = sizeof(int), 4939 .mode = 0644, 4940 .proc_handler = proc_dointvec, 4941 }, 4942 #endif 4943 #endif 4944 { 4945 .procname = "proxy_ndp", 4946 .data = &ipv6_devconf.proxy_ndp, 4947 .maxlen = sizeof(int), 4948 .mode = 0644, 4949 .proc_handler = proc_dointvec, 4950 }, 4951 { 4952 .procname = "accept_source_route", 4953 .data = &ipv6_devconf.accept_source_route, 4954 .maxlen = sizeof(int), 4955 .mode = 0644, 4956 .proc_handler = proc_dointvec, 4957 }, 4958 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 4959 { 4960 .procname = "optimistic_dad", 4961 .data = &ipv6_devconf.optimistic_dad, 4962 .maxlen = sizeof(int), 4963 .mode = 0644, 4964 .proc_handler = proc_dointvec, 4965 4966 }, 4967 #endif 4968 #ifdef CONFIG_IPV6_MROUTE 4969 { 4970 .procname = "mc_forwarding", 4971 .data = &ipv6_devconf.mc_forwarding, 4972 .maxlen = sizeof(int), 4973 .mode = 0444, 4974 .proc_handler = proc_dointvec, 4975 }, 4976 #endif 4977 { 4978 .procname = "disable_ipv6", 4979 .data = &ipv6_devconf.disable_ipv6, 4980 .maxlen = sizeof(int), 4981 .mode = 0644, 4982 .proc_handler = addrconf_sysctl_disable, 4983 }, 4984 { 4985 .procname = "accept_dad", 4986 .data = &ipv6_devconf.accept_dad, 4987 .maxlen = sizeof(int), 4988 .mode = 0644, 4989 .proc_handler = proc_dointvec, 4990 }, 4991 { 4992 .procname = "force_tllao", 4993 .data = &ipv6_devconf.force_tllao, 4994 .maxlen = sizeof(int), 4995 .mode = 0644, 4996 .proc_handler = proc_dointvec 4997 }, 4998 { 4999 .procname = "ndisc_notify", 5000 .data = &ipv6_devconf.ndisc_notify, 5001 .maxlen = sizeof(int), 5002 .mode = 0644, 5003 .proc_handler = proc_dointvec 5004 }, 5005 { 5006 /* sentinel */ 5007 } 5008 }, 5009 }; 5010 5011 static int __addrconf_sysctl_register(struct net *net, char *dev_name, 5012 struct inet6_dev *idev, struct ipv6_devconf *p) 5013 { 5014 int i; 5015 struct addrconf_sysctl_table *t; 5016 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ]; 5017 5018 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL); 5019 if (t == NULL) 5020 goto out; 5021 5022 for (i = 0; t->addrconf_vars[i].data; i++) { 5023 t->addrconf_vars[i].data += (char *)p - (char *)&ipv6_devconf; 5024 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */ 5025 t->addrconf_vars[i].extra2 = net; 5026 } 5027 5028 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name); 5029 5030 t->sysctl_header = register_net_sysctl(net, path, t->addrconf_vars); 5031 if (t->sysctl_header == NULL) 5032 goto free; 5033 5034 p->sysctl = t; 5035 return 0; 5036 5037 free: 5038 kfree(t); 5039 out: 5040 return -ENOBUFS; 5041 } 5042 5043 static void __addrconf_sysctl_unregister(struct ipv6_devconf *p) 5044 { 5045 struct addrconf_sysctl_table *t; 5046 5047 if (p->sysctl == NULL) 5048 return; 5049 5050 t = p->sysctl; 5051 p->sysctl = NULL; 5052 unregister_net_sysctl_table(t->sysctl_header); 5053 kfree(t); 5054 } 5055 5056 static void addrconf_sysctl_register(struct inet6_dev *idev) 5057 { 5058 neigh_sysctl_register(idev->dev, idev->nd_parms, "ipv6", 5059 &ndisc_ifinfo_sysctl_change); 5060 __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name, 5061 idev, &idev->cnf); 5062 } 5063 5064 static void addrconf_sysctl_unregister(struct inet6_dev *idev) 5065 { 5066 __addrconf_sysctl_unregister(&idev->cnf); 5067 neigh_sysctl_unregister(idev->nd_parms); 5068 } 5069 5070 5071 #endif 5072 5073 static int __net_init addrconf_init_net(struct net *net) 5074 { 5075 int err = -ENOMEM; 5076 struct ipv6_devconf *all, *dflt; 5077 5078 all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL); 5079 if (all == NULL) 5080 goto err_alloc_all; 5081 5082 dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL); 5083 if (dflt == NULL) 5084 goto err_alloc_dflt; 5085 5086 /* these will be inherited by all namespaces */ 5087 dflt->autoconf = ipv6_defaults.autoconf; 5088 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6; 5089 5090 net->ipv6.devconf_all = all; 5091 net->ipv6.devconf_dflt = dflt; 5092 5093 #ifdef CONFIG_SYSCTL 5094 err = __addrconf_sysctl_register(net, "all", NULL, all); 5095 if (err < 0) 5096 goto err_reg_all; 5097 5098 err = __addrconf_sysctl_register(net, "default", NULL, dflt); 5099 if (err < 0) 5100 goto err_reg_dflt; 5101 #endif 5102 return 0; 5103 5104 #ifdef CONFIG_SYSCTL 5105 err_reg_dflt: 5106 __addrconf_sysctl_unregister(all); 5107 err_reg_all: 5108 kfree(dflt); 5109 #endif 5110 err_alloc_dflt: 5111 kfree(all); 5112 err_alloc_all: 5113 return err; 5114 } 5115 5116 static void __net_exit addrconf_exit_net(struct net *net) 5117 { 5118 #ifdef CONFIG_SYSCTL 5119 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt); 5120 __addrconf_sysctl_unregister(net->ipv6.devconf_all); 5121 #endif 5122 if (!net_eq(net, &init_net)) { 5123 kfree(net->ipv6.devconf_dflt); 5124 kfree(net->ipv6.devconf_all); 5125 } 5126 } 5127 5128 static struct pernet_operations addrconf_ops = { 5129 .init = addrconf_init_net, 5130 .exit = addrconf_exit_net, 5131 }; 5132 5133 static struct rtnl_af_ops inet6_ops = { 5134 .family = AF_INET6, 5135 .fill_link_af = inet6_fill_link_af, 5136 .get_link_af_size = inet6_get_link_af_size, 5137 .set_link_af = inet6_set_link_af, 5138 }; 5139 5140 /* 5141 * Init / cleanup code 5142 */ 5143 5144 int __init addrconf_init(void) 5145 { 5146 int i, err; 5147 5148 err = ipv6_addr_label_init(); 5149 if (err < 0) { 5150 pr_crit("%s: cannot initialize default policy table: %d\n", 5151 __func__, err); 5152 goto out; 5153 } 5154 5155 err = register_pernet_subsys(&addrconf_ops); 5156 if (err < 0) 5157 goto out_addrlabel; 5158 5159 /* The addrconf netdev notifier requires that loopback_dev 5160 * has it's ipv6 private information allocated and setup 5161 * before it can bring up and give link-local addresses 5162 * to other devices which are up. 5163 * 5164 * Unfortunately, loopback_dev is not necessarily the first 5165 * entry in the global dev_base list of net devices. In fact, 5166 * it is likely to be the very last entry on that list. 5167 * So this causes the notifier registry below to try and 5168 * give link-local addresses to all devices besides loopback_dev 5169 * first, then loopback_dev, which cases all the non-loopback_dev 5170 * devices to fail to get a link-local address. 5171 * 5172 * So, as a temporary fix, allocate the ipv6 structure for 5173 * loopback_dev first by hand. 5174 * Longer term, all of the dependencies ipv6 has upon the loopback 5175 * device and it being up should be removed. 5176 */ 5177 rtnl_lock(); 5178 if (!ipv6_add_dev(init_net.loopback_dev)) 5179 err = -ENOMEM; 5180 rtnl_unlock(); 5181 if (err) 5182 goto errlo; 5183 5184 for (i = 0; i < IN6_ADDR_HSIZE; i++) 5185 INIT_HLIST_HEAD(&inet6_addr_lst[i]); 5186 5187 register_netdevice_notifier(&ipv6_dev_notf); 5188 5189 addrconf_verify(0); 5190 5191 err = rtnl_af_register(&inet6_ops); 5192 if (err < 0) 5193 goto errout_af; 5194 5195 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo, 5196 NULL); 5197 if (err < 0) 5198 goto errout; 5199 5200 /* Only the first call to __rtnl_register can fail */ 5201 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL, NULL); 5202 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL, NULL); 5203 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr, 5204 inet6_dump_ifaddr, NULL); 5205 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL, 5206 inet6_dump_ifmcaddr, NULL); 5207 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL, 5208 inet6_dump_ifacaddr, NULL); 5209 __rtnl_register(PF_INET6, RTM_GETNETCONF, inet6_netconf_get_devconf, 5210 inet6_netconf_dump_devconf, NULL); 5211 5212 ipv6_addr_label_rtnl_register(); 5213 5214 return 0; 5215 errout: 5216 rtnl_af_unregister(&inet6_ops); 5217 errout_af: 5218 unregister_netdevice_notifier(&ipv6_dev_notf); 5219 errlo: 5220 unregister_pernet_subsys(&addrconf_ops); 5221 out_addrlabel: 5222 ipv6_addr_label_cleanup(); 5223 out: 5224 return err; 5225 } 5226 5227 void addrconf_cleanup(void) 5228 { 5229 struct net_device *dev; 5230 int i; 5231 5232 unregister_netdevice_notifier(&ipv6_dev_notf); 5233 unregister_pernet_subsys(&addrconf_ops); 5234 ipv6_addr_label_cleanup(); 5235 5236 rtnl_lock(); 5237 5238 __rtnl_af_unregister(&inet6_ops); 5239 5240 /* clean dev list */ 5241 for_each_netdev(&init_net, dev) { 5242 if (__in6_dev_get(dev) == NULL) 5243 continue; 5244 addrconf_ifdown(dev, 1); 5245 } 5246 addrconf_ifdown(init_net.loopback_dev, 2); 5247 5248 /* 5249 * Check hash table. 5250 */ 5251 spin_lock_bh(&addrconf_hash_lock); 5252 for (i = 0; i < IN6_ADDR_HSIZE; i++) 5253 WARN_ON(!hlist_empty(&inet6_addr_lst[i])); 5254 spin_unlock_bh(&addrconf_hash_lock); 5255 5256 del_timer(&addr_chk_timer); 5257 rtnl_unlock(); 5258 } 5259