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 #include <linux/random.h> 87 #include <linux/uaccess.h> 88 #include <asm/unaligned.h> 89 90 #include <linux/proc_fs.h> 91 #include <linux/seq_file.h> 92 #include <linux/export.h> 93 94 /* Set to 3 to get tracing... */ 95 #define ACONF_DEBUG 2 96 97 #if ACONF_DEBUG >= 3 98 #define ADBG(fmt, ...) printk(fmt, ##__VA_ARGS__) 99 #else 100 #define ADBG(fmt, ...) do { if (0) printk(fmt, ##__VA_ARGS__); } while (0) 101 #endif 102 103 #define INFINITY_LIFE_TIME 0xFFFFFFFF 104 105 static inline u32 cstamp_delta(unsigned long cstamp) 106 { 107 return (cstamp - INITIAL_JIFFIES) * 100UL / HZ; 108 } 109 110 #ifdef CONFIG_SYSCTL 111 static void addrconf_sysctl_register(struct inet6_dev *idev); 112 static void addrconf_sysctl_unregister(struct inet6_dev *idev); 113 #else 114 static inline void addrconf_sysctl_register(struct inet6_dev *idev) 115 { 116 } 117 118 static inline void addrconf_sysctl_unregister(struct inet6_dev *idev) 119 { 120 } 121 #endif 122 123 static void __ipv6_regen_rndid(struct inet6_dev *idev); 124 static void __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr); 125 static void ipv6_regen_rndid(unsigned long data); 126 127 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev); 128 static int ipv6_count_addresses(struct inet6_dev *idev); 129 130 /* 131 * Configured unicast address hash table 132 */ 133 static struct hlist_head inet6_addr_lst[IN6_ADDR_HSIZE]; 134 static DEFINE_SPINLOCK(addrconf_hash_lock); 135 136 static void addrconf_verify(void); 137 static void addrconf_verify_rtnl(void); 138 static void addrconf_verify_work(struct work_struct *); 139 140 static struct workqueue_struct *addrconf_wq; 141 static DECLARE_DELAYED_WORK(addr_chk_work, addrconf_verify_work); 142 143 static void addrconf_join_anycast(struct inet6_ifaddr *ifp); 144 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp); 145 146 static void addrconf_type_change(struct net_device *dev, 147 unsigned long event); 148 static int addrconf_ifdown(struct net_device *dev, int how); 149 150 static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx, 151 int plen, 152 const struct net_device *dev, 153 u32 flags, u32 noflags); 154 155 static void addrconf_dad_start(struct inet6_ifaddr *ifp); 156 static void addrconf_dad_work(struct work_struct *w); 157 static void addrconf_dad_completed(struct inet6_ifaddr *ifp); 158 static void addrconf_dad_run(struct inet6_dev *idev); 159 static void addrconf_rs_timer(unsigned long data); 160 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa); 161 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa); 162 163 static void inet6_prefix_notify(int event, struct inet6_dev *idev, 164 struct prefix_info *pinfo); 165 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr, 166 struct net_device *dev); 167 168 static struct ipv6_devconf ipv6_devconf __read_mostly = { 169 .forwarding = 0, 170 .hop_limit = IPV6_DEFAULT_HOPLIMIT, 171 .mtu6 = IPV6_MIN_MTU, 172 .accept_ra = 1, 173 .accept_redirects = 1, 174 .autoconf = 1, 175 .force_mld_version = 0, 176 .mldv1_unsolicited_report_interval = 10 * HZ, 177 .mldv2_unsolicited_report_interval = HZ, 178 .dad_transmits = 1, 179 .rtr_solicits = MAX_RTR_SOLICITATIONS, 180 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL, 181 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY, 182 .use_tempaddr = 0, 183 .temp_valid_lft = TEMP_VALID_LIFETIME, 184 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME, 185 .regen_max_retry = REGEN_MAX_RETRY, 186 .max_desync_factor = MAX_DESYNC_FACTOR, 187 .max_addresses = IPV6_MAX_ADDRESSES, 188 .accept_ra_defrtr = 1, 189 .accept_ra_pinfo = 1, 190 #ifdef CONFIG_IPV6_ROUTER_PREF 191 .accept_ra_rtr_pref = 1, 192 .rtr_probe_interval = 60 * HZ, 193 #ifdef CONFIG_IPV6_ROUTE_INFO 194 .accept_ra_rt_info_max_plen = 0, 195 #endif 196 #endif 197 .proxy_ndp = 0, 198 .accept_source_route = 0, /* we do not accept RH0 by default. */ 199 .disable_ipv6 = 0, 200 .accept_dad = 1, 201 .suppress_frag_ndisc = 1, 202 }; 203 204 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = { 205 .forwarding = 0, 206 .hop_limit = IPV6_DEFAULT_HOPLIMIT, 207 .mtu6 = IPV6_MIN_MTU, 208 .accept_ra = 1, 209 .accept_redirects = 1, 210 .autoconf = 1, 211 .force_mld_version = 0, 212 .mldv1_unsolicited_report_interval = 10 * HZ, 213 .mldv2_unsolicited_report_interval = HZ, 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 .use_tempaddr = 0, 219 .temp_valid_lft = TEMP_VALID_LIFETIME, 220 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME, 221 .regen_max_retry = REGEN_MAX_RETRY, 222 .max_desync_factor = MAX_DESYNC_FACTOR, 223 .max_addresses = IPV6_MAX_ADDRESSES, 224 .accept_ra_defrtr = 1, 225 .accept_ra_pinfo = 1, 226 #ifdef CONFIG_IPV6_ROUTER_PREF 227 .accept_ra_rtr_pref = 1, 228 .rtr_probe_interval = 60 * HZ, 229 #ifdef CONFIG_IPV6_ROUTE_INFO 230 .accept_ra_rt_info_max_plen = 0, 231 #endif 232 #endif 233 .proxy_ndp = 0, 234 .accept_source_route = 0, /* we do not accept RH0 by default. */ 235 .disable_ipv6 = 0, 236 .accept_dad = 1, 237 .suppress_frag_ndisc = 1, 238 }; 239 240 /* Check if a valid qdisc is available */ 241 static inline bool addrconf_qdisc_ok(const struct net_device *dev) 242 { 243 return !qdisc_tx_is_noop(dev); 244 } 245 246 static void addrconf_del_rs_timer(struct inet6_dev *idev) 247 { 248 if (del_timer(&idev->rs_timer)) 249 __in6_dev_put(idev); 250 } 251 252 static void addrconf_del_dad_work(struct inet6_ifaddr *ifp) 253 { 254 if (cancel_delayed_work(&ifp->dad_work)) 255 __in6_ifa_put(ifp); 256 } 257 258 static void addrconf_mod_rs_timer(struct inet6_dev *idev, 259 unsigned long when) 260 { 261 if (!timer_pending(&idev->rs_timer)) 262 in6_dev_hold(idev); 263 mod_timer(&idev->rs_timer, jiffies + when); 264 } 265 266 static void addrconf_mod_dad_work(struct inet6_ifaddr *ifp, 267 unsigned long delay) 268 { 269 if (!delayed_work_pending(&ifp->dad_work)) 270 in6_ifa_hold(ifp); 271 mod_delayed_work(addrconf_wq, &ifp->dad_work, delay); 272 } 273 274 static int snmp6_alloc_dev(struct inet6_dev *idev) 275 { 276 int i; 277 278 if (snmp_mib_init((void __percpu **)idev->stats.ipv6, 279 sizeof(struct ipstats_mib), 280 __alignof__(struct ipstats_mib)) < 0) 281 goto err_ip; 282 283 for_each_possible_cpu(i) { 284 struct ipstats_mib *addrconf_stats; 285 addrconf_stats = per_cpu_ptr(idev->stats.ipv6[0], i); 286 u64_stats_init(&addrconf_stats->syncp); 287 #if SNMP_ARRAY_SZ == 2 288 addrconf_stats = per_cpu_ptr(idev->stats.ipv6[1], i); 289 u64_stats_init(&addrconf_stats->syncp); 290 #endif 291 } 292 293 294 idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device), 295 GFP_KERNEL); 296 if (!idev->stats.icmpv6dev) 297 goto err_icmp; 298 idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device), 299 GFP_KERNEL); 300 if (!idev->stats.icmpv6msgdev) 301 goto err_icmpmsg; 302 303 return 0; 304 305 err_icmpmsg: 306 kfree(idev->stats.icmpv6dev); 307 err_icmp: 308 snmp_mib_free((void __percpu **)idev->stats.ipv6); 309 err_ip: 310 return -ENOMEM; 311 } 312 313 static struct inet6_dev *ipv6_add_dev(struct net_device *dev) 314 { 315 struct inet6_dev *ndev; 316 317 ASSERT_RTNL(); 318 319 if (dev->mtu < IPV6_MIN_MTU) 320 return NULL; 321 322 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL); 323 324 if (ndev == NULL) 325 return NULL; 326 327 rwlock_init(&ndev->lock); 328 ndev->dev = dev; 329 INIT_LIST_HEAD(&ndev->addr_list); 330 setup_timer(&ndev->rs_timer, addrconf_rs_timer, 331 (unsigned long)ndev); 332 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf)); 333 ndev->cnf.mtu6 = dev->mtu; 334 ndev->cnf.sysctl = NULL; 335 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl); 336 if (ndev->nd_parms == NULL) { 337 kfree(ndev); 338 return NULL; 339 } 340 if (ndev->cnf.forwarding) 341 dev_disable_lro(dev); 342 /* We refer to the device */ 343 dev_hold(dev); 344 345 if (snmp6_alloc_dev(ndev) < 0) { 346 ADBG(KERN_WARNING 347 "%s: cannot allocate memory for statistics; dev=%s.\n", 348 __func__, dev->name); 349 neigh_parms_release(&nd_tbl, ndev->nd_parms); 350 dev_put(dev); 351 kfree(ndev); 352 return NULL; 353 } 354 355 if (snmp6_register_dev(ndev) < 0) { 356 ADBG(KERN_WARNING 357 "%s: cannot create /proc/net/dev_snmp6/%s\n", 358 __func__, dev->name); 359 neigh_parms_release(&nd_tbl, ndev->nd_parms); 360 ndev->dead = 1; 361 in6_dev_finish_destroy(ndev); 362 return NULL; 363 } 364 365 /* One reference from device. We must do this before 366 * we invoke __ipv6_regen_rndid(). 367 */ 368 in6_dev_hold(ndev); 369 370 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK)) 371 ndev->cnf.accept_dad = -1; 372 373 #if IS_ENABLED(CONFIG_IPV6_SIT) 374 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) { 375 pr_info("%s: Disabled Multicast RS\n", dev->name); 376 ndev->cnf.rtr_solicits = 0; 377 } 378 #endif 379 380 INIT_LIST_HEAD(&ndev->tempaddr_list); 381 setup_timer(&ndev->regen_timer, ipv6_regen_rndid, (unsigned long)ndev); 382 if ((dev->flags&IFF_LOOPBACK) || 383 dev->type == ARPHRD_TUNNEL || 384 dev->type == ARPHRD_TUNNEL6 || 385 dev->type == ARPHRD_SIT || 386 dev->type == ARPHRD_NONE) { 387 ndev->cnf.use_tempaddr = -1; 388 } else { 389 in6_dev_hold(ndev); 390 ipv6_regen_rndid((unsigned long) ndev); 391 } 392 393 ndev->token = in6addr_any; 394 395 if (netif_running(dev) && addrconf_qdisc_ok(dev)) 396 ndev->if_flags |= IF_READY; 397 398 ipv6_mc_init_dev(ndev); 399 ndev->tstamp = jiffies; 400 addrconf_sysctl_register(ndev); 401 /* protected by rtnl_lock */ 402 rcu_assign_pointer(dev->ip6_ptr, ndev); 403 404 /* Join interface-local all-node multicast group */ 405 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allnodes); 406 407 /* Join all-node multicast group */ 408 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes); 409 410 /* Join all-router multicast group if forwarding is set */ 411 if (ndev->cnf.forwarding && (dev->flags & IFF_MULTICAST)) 412 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters); 413 414 return ndev; 415 } 416 417 static struct inet6_dev *ipv6_find_idev(struct net_device *dev) 418 { 419 struct inet6_dev *idev; 420 421 ASSERT_RTNL(); 422 423 idev = __in6_dev_get(dev); 424 if (!idev) { 425 idev = ipv6_add_dev(dev); 426 if (!idev) 427 return NULL; 428 } 429 430 if (dev->flags&IFF_UP) 431 ipv6_mc_up(idev); 432 return idev; 433 } 434 435 static int inet6_netconf_msgsize_devconf(int type) 436 { 437 int size = NLMSG_ALIGN(sizeof(struct netconfmsg)) 438 + nla_total_size(4); /* NETCONFA_IFINDEX */ 439 440 /* type -1 is used for ALL */ 441 if (type == -1 || type == NETCONFA_FORWARDING) 442 size += nla_total_size(4); 443 #ifdef CONFIG_IPV6_MROUTE 444 if (type == -1 || type == NETCONFA_MC_FORWARDING) 445 size += nla_total_size(4); 446 #endif 447 if (type == -1 || type == NETCONFA_PROXY_NEIGH) 448 size += nla_total_size(4); 449 450 return size; 451 } 452 453 static int inet6_netconf_fill_devconf(struct sk_buff *skb, int ifindex, 454 struct ipv6_devconf *devconf, u32 portid, 455 u32 seq, int event, unsigned int flags, 456 int type) 457 { 458 struct nlmsghdr *nlh; 459 struct netconfmsg *ncm; 460 461 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg), 462 flags); 463 if (nlh == NULL) 464 return -EMSGSIZE; 465 466 ncm = nlmsg_data(nlh); 467 ncm->ncm_family = AF_INET6; 468 469 if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0) 470 goto nla_put_failure; 471 472 /* type -1 is used for ALL */ 473 if ((type == -1 || type == NETCONFA_FORWARDING) && 474 nla_put_s32(skb, NETCONFA_FORWARDING, devconf->forwarding) < 0) 475 goto nla_put_failure; 476 #ifdef CONFIG_IPV6_MROUTE 477 if ((type == -1 || type == NETCONFA_MC_FORWARDING) && 478 nla_put_s32(skb, NETCONFA_MC_FORWARDING, 479 devconf->mc_forwarding) < 0) 480 goto nla_put_failure; 481 #endif 482 if ((type == -1 || type == NETCONFA_PROXY_NEIGH) && 483 nla_put_s32(skb, NETCONFA_PROXY_NEIGH, devconf->proxy_ndp) < 0) 484 goto nla_put_failure; 485 486 return nlmsg_end(skb, nlh); 487 488 nla_put_failure: 489 nlmsg_cancel(skb, nlh); 490 return -EMSGSIZE; 491 } 492 493 void inet6_netconf_notify_devconf(struct net *net, int type, int ifindex, 494 struct ipv6_devconf *devconf) 495 { 496 struct sk_buff *skb; 497 int err = -ENOBUFS; 498 499 skb = nlmsg_new(inet6_netconf_msgsize_devconf(type), GFP_ATOMIC); 500 if (skb == NULL) 501 goto errout; 502 503 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 0, 0, 504 RTM_NEWNETCONF, 0, type); 505 if (err < 0) { 506 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */ 507 WARN_ON(err == -EMSGSIZE); 508 kfree_skb(skb); 509 goto errout; 510 } 511 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_NETCONF, NULL, GFP_ATOMIC); 512 return; 513 errout: 514 rtnl_set_sk_err(net, RTNLGRP_IPV6_NETCONF, err); 515 } 516 517 static const struct nla_policy devconf_ipv6_policy[NETCONFA_MAX+1] = { 518 [NETCONFA_IFINDEX] = { .len = sizeof(int) }, 519 [NETCONFA_FORWARDING] = { .len = sizeof(int) }, 520 [NETCONFA_PROXY_NEIGH] = { .len = sizeof(int) }, 521 }; 522 523 static int inet6_netconf_get_devconf(struct sk_buff *in_skb, 524 struct nlmsghdr *nlh) 525 { 526 struct net *net = sock_net(in_skb->sk); 527 struct nlattr *tb[NETCONFA_MAX+1]; 528 struct netconfmsg *ncm; 529 struct sk_buff *skb; 530 struct ipv6_devconf *devconf; 531 struct inet6_dev *in6_dev; 532 struct net_device *dev; 533 int ifindex; 534 int err; 535 536 err = nlmsg_parse(nlh, sizeof(*ncm), tb, NETCONFA_MAX, 537 devconf_ipv6_policy); 538 if (err < 0) 539 goto errout; 540 541 err = EINVAL; 542 if (!tb[NETCONFA_IFINDEX]) 543 goto errout; 544 545 ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]); 546 switch (ifindex) { 547 case NETCONFA_IFINDEX_ALL: 548 devconf = net->ipv6.devconf_all; 549 break; 550 case NETCONFA_IFINDEX_DEFAULT: 551 devconf = net->ipv6.devconf_dflt; 552 break; 553 default: 554 dev = __dev_get_by_index(net, ifindex); 555 if (dev == NULL) 556 goto errout; 557 in6_dev = __in6_dev_get(dev); 558 if (in6_dev == NULL) 559 goto errout; 560 devconf = &in6_dev->cnf; 561 break; 562 } 563 564 err = -ENOBUFS; 565 skb = nlmsg_new(inet6_netconf_msgsize_devconf(-1), GFP_ATOMIC); 566 if (skb == NULL) 567 goto errout; 568 569 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 570 NETLINK_CB(in_skb).portid, 571 nlh->nlmsg_seq, RTM_NEWNETCONF, 0, 572 -1); 573 if (err < 0) { 574 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */ 575 WARN_ON(err == -EMSGSIZE); 576 kfree_skb(skb); 577 goto errout; 578 } 579 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid); 580 errout: 581 return err; 582 } 583 584 static int inet6_netconf_dump_devconf(struct sk_buff *skb, 585 struct netlink_callback *cb) 586 { 587 struct net *net = sock_net(skb->sk); 588 int h, s_h; 589 int idx, s_idx; 590 struct net_device *dev; 591 struct inet6_dev *idev; 592 struct hlist_head *head; 593 594 s_h = cb->args[0]; 595 s_idx = idx = cb->args[1]; 596 597 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 598 idx = 0; 599 head = &net->dev_index_head[h]; 600 rcu_read_lock(); 601 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ 602 net->dev_base_seq; 603 hlist_for_each_entry_rcu(dev, head, index_hlist) { 604 if (idx < s_idx) 605 goto cont; 606 idev = __in6_dev_get(dev); 607 if (!idev) 608 goto cont; 609 610 if (inet6_netconf_fill_devconf(skb, dev->ifindex, 611 &idev->cnf, 612 NETLINK_CB(cb->skb).portid, 613 cb->nlh->nlmsg_seq, 614 RTM_NEWNETCONF, 615 NLM_F_MULTI, 616 -1) <= 0) { 617 rcu_read_unlock(); 618 goto done; 619 } 620 nl_dump_check_consistent(cb, nlmsg_hdr(skb)); 621 cont: 622 idx++; 623 } 624 rcu_read_unlock(); 625 } 626 if (h == NETDEV_HASHENTRIES) { 627 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL, 628 net->ipv6.devconf_all, 629 NETLINK_CB(cb->skb).portid, 630 cb->nlh->nlmsg_seq, 631 RTM_NEWNETCONF, NLM_F_MULTI, 632 -1) <= 0) 633 goto done; 634 else 635 h++; 636 } 637 if (h == NETDEV_HASHENTRIES + 1) { 638 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT, 639 net->ipv6.devconf_dflt, 640 NETLINK_CB(cb->skb).portid, 641 cb->nlh->nlmsg_seq, 642 RTM_NEWNETCONF, NLM_F_MULTI, 643 -1) <= 0) 644 goto done; 645 else 646 h++; 647 } 648 done: 649 cb->args[0] = h; 650 cb->args[1] = idx; 651 652 return skb->len; 653 } 654 655 #ifdef CONFIG_SYSCTL 656 static void dev_forward_change(struct inet6_dev *idev) 657 { 658 struct net_device *dev; 659 struct inet6_ifaddr *ifa; 660 661 if (!idev) 662 return; 663 dev = idev->dev; 664 if (idev->cnf.forwarding) 665 dev_disable_lro(dev); 666 if (dev->flags & IFF_MULTICAST) { 667 if (idev->cnf.forwarding) { 668 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters); 669 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allrouters); 670 ipv6_dev_mc_inc(dev, &in6addr_sitelocal_allrouters); 671 } else { 672 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters); 673 ipv6_dev_mc_dec(dev, &in6addr_interfacelocal_allrouters); 674 ipv6_dev_mc_dec(dev, &in6addr_sitelocal_allrouters); 675 } 676 } 677 678 list_for_each_entry(ifa, &idev->addr_list, if_list) { 679 if (ifa->flags&IFA_F_TENTATIVE) 680 continue; 681 if (idev->cnf.forwarding) 682 addrconf_join_anycast(ifa); 683 else 684 addrconf_leave_anycast(ifa); 685 } 686 inet6_netconf_notify_devconf(dev_net(dev), NETCONFA_FORWARDING, 687 dev->ifindex, &idev->cnf); 688 } 689 690 691 static void addrconf_forward_change(struct net *net, __s32 newf) 692 { 693 struct net_device *dev; 694 struct inet6_dev *idev; 695 696 for_each_netdev(net, dev) { 697 idev = __in6_dev_get(dev); 698 if (idev) { 699 int changed = (!idev->cnf.forwarding) ^ (!newf); 700 idev->cnf.forwarding = newf; 701 if (changed) 702 dev_forward_change(idev); 703 } 704 } 705 } 706 707 static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf) 708 { 709 struct net *net; 710 int old; 711 712 if (!rtnl_trylock()) 713 return restart_syscall(); 714 715 net = (struct net *)table->extra2; 716 old = *p; 717 *p = newf; 718 719 if (p == &net->ipv6.devconf_dflt->forwarding) { 720 if ((!newf) ^ (!old)) 721 inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING, 722 NETCONFA_IFINDEX_DEFAULT, 723 net->ipv6.devconf_dflt); 724 rtnl_unlock(); 725 return 0; 726 } 727 728 if (p == &net->ipv6.devconf_all->forwarding) { 729 net->ipv6.devconf_dflt->forwarding = newf; 730 addrconf_forward_change(net, newf); 731 if ((!newf) ^ (!old)) 732 inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING, 733 NETCONFA_IFINDEX_ALL, 734 net->ipv6.devconf_all); 735 } else if ((!newf) ^ (!old)) 736 dev_forward_change((struct inet6_dev *)table->extra1); 737 rtnl_unlock(); 738 739 if (newf) 740 rt6_purge_dflt_routers(net); 741 return 1; 742 } 743 #endif 744 745 /* Nobody refers to this ifaddr, destroy it */ 746 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp) 747 { 748 WARN_ON(!hlist_unhashed(&ifp->addr_lst)); 749 750 #ifdef NET_REFCNT_DEBUG 751 pr_debug("%s\n", __func__); 752 #endif 753 754 in6_dev_put(ifp->idev); 755 756 if (cancel_delayed_work(&ifp->dad_work)) 757 pr_notice("delayed DAD work was pending while freeing ifa=%p\n", 758 ifp); 759 760 if (ifp->state != INET6_IFADDR_STATE_DEAD) { 761 pr_warn("Freeing alive inet6 address %p\n", ifp); 762 return; 763 } 764 ip6_rt_put(ifp->rt); 765 766 kfree_rcu(ifp, rcu); 767 } 768 769 static void 770 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp) 771 { 772 struct list_head *p; 773 int ifp_scope = ipv6_addr_src_scope(&ifp->addr); 774 775 /* 776 * Each device address list is sorted in order of scope - 777 * global before linklocal. 778 */ 779 list_for_each(p, &idev->addr_list) { 780 struct inet6_ifaddr *ifa 781 = list_entry(p, struct inet6_ifaddr, if_list); 782 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr)) 783 break; 784 } 785 786 list_add_tail(&ifp->if_list, p); 787 } 788 789 static u32 inet6_addr_hash(const struct in6_addr *addr) 790 { 791 return hash_32(ipv6_addr_hash(addr), IN6_ADDR_HSIZE_SHIFT); 792 } 793 794 /* On success it returns ifp with increased reference count */ 795 796 static struct inet6_ifaddr * 797 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, 798 const struct in6_addr *peer_addr, int pfxlen, 799 int scope, u32 flags, u32 valid_lft, u32 prefered_lft) 800 { 801 struct inet6_ifaddr *ifa = NULL; 802 struct rt6_info *rt; 803 unsigned int hash; 804 int err = 0; 805 int addr_type = ipv6_addr_type(addr); 806 807 if (addr_type == IPV6_ADDR_ANY || 808 addr_type & IPV6_ADDR_MULTICAST || 809 (!(idev->dev->flags & IFF_LOOPBACK) && 810 addr_type & IPV6_ADDR_LOOPBACK)) 811 return ERR_PTR(-EADDRNOTAVAIL); 812 813 rcu_read_lock_bh(); 814 if (idev->dead) { 815 err = -ENODEV; /*XXX*/ 816 goto out2; 817 } 818 819 if (idev->cnf.disable_ipv6) { 820 err = -EACCES; 821 goto out2; 822 } 823 824 spin_lock(&addrconf_hash_lock); 825 826 /* Ignore adding duplicate addresses on an interface */ 827 if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) { 828 ADBG("ipv6_add_addr: already assigned\n"); 829 err = -EEXIST; 830 goto out; 831 } 832 833 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC); 834 835 if (ifa == NULL) { 836 ADBG("ipv6_add_addr: malloc failed\n"); 837 err = -ENOBUFS; 838 goto out; 839 } 840 841 rt = addrconf_dst_alloc(idev, addr, false); 842 if (IS_ERR(rt)) { 843 err = PTR_ERR(rt); 844 goto out; 845 } 846 847 neigh_parms_data_state_setall(idev->nd_parms); 848 849 ifa->addr = *addr; 850 if (peer_addr) 851 ifa->peer_addr = *peer_addr; 852 853 spin_lock_init(&ifa->lock); 854 spin_lock_init(&ifa->state_lock); 855 INIT_DELAYED_WORK(&ifa->dad_work, addrconf_dad_work); 856 INIT_HLIST_NODE(&ifa->addr_lst); 857 ifa->scope = scope; 858 ifa->prefix_len = pfxlen; 859 ifa->flags = flags | IFA_F_TENTATIVE; 860 ifa->valid_lft = valid_lft; 861 ifa->prefered_lft = prefered_lft; 862 ifa->cstamp = ifa->tstamp = jiffies; 863 ifa->tokenized = false; 864 865 ifa->rt = rt; 866 867 ifa->idev = idev; 868 in6_dev_hold(idev); 869 /* For caller */ 870 in6_ifa_hold(ifa); 871 872 /* Add to big hash table */ 873 hash = inet6_addr_hash(addr); 874 875 hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]); 876 spin_unlock(&addrconf_hash_lock); 877 878 write_lock(&idev->lock); 879 /* Add to inet6_dev unicast addr list. */ 880 ipv6_link_dev_addr(idev, ifa); 881 882 if (ifa->flags&IFA_F_TEMPORARY) { 883 list_add(&ifa->tmp_list, &idev->tempaddr_list); 884 in6_ifa_hold(ifa); 885 } 886 887 in6_ifa_hold(ifa); 888 write_unlock(&idev->lock); 889 out2: 890 rcu_read_unlock_bh(); 891 892 if (likely(err == 0)) 893 inet6addr_notifier_call_chain(NETDEV_UP, ifa); 894 else { 895 kfree(ifa); 896 ifa = ERR_PTR(err); 897 } 898 899 return ifa; 900 out: 901 spin_unlock(&addrconf_hash_lock); 902 goto out2; 903 } 904 905 enum cleanup_prefix_rt_t { 906 CLEANUP_PREFIX_RT_NOP, /* no cleanup action for prefix route */ 907 CLEANUP_PREFIX_RT_DEL, /* delete the prefix route */ 908 CLEANUP_PREFIX_RT_EXPIRE, /* update the lifetime of the prefix route */ 909 }; 910 911 /* 912 * Check, whether the prefix for ifp would still need a prefix route 913 * after deleting ifp. The function returns one of the CLEANUP_PREFIX_RT_* 914 * constants. 915 * 916 * 1) we don't purge prefix if address was not permanent. 917 * prefix is managed by its own lifetime. 918 * 2) we also don't purge, if the address was IFA_F_NOPREFIXROUTE. 919 * 3) if there are no addresses, delete prefix. 920 * 4) if there are still other permanent address(es), 921 * corresponding prefix is still permanent. 922 * 5) if there are still other addresses with IFA_F_NOPREFIXROUTE, 923 * don't purge the prefix, assume user space is managing it. 924 * 6) otherwise, update prefix lifetime to the 925 * longest valid lifetime among the corresponding 926 * addresses on the device. 927 * Note: subsequent RA will update lifetime. 928 **/ 929 static enum cleanup_prefix_rt_t 930 check_cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long *expires) 931 { 932 struct inet6_ifaddr *ifa; 933 struct inet6_dev *idev = ifp->idev; 934 unsigned long lifetime; 935 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_DEL; 936 937 *expires = jiffies; 938 939 list_for_each_entry(ifa, &idev->addr_list, if_list) { 940 if (ifa == ifp) 941 continue; 942 if (!ipv6_prefix_equal(&ifa->addr, &ifp->addr, 943 ifp->prefix_len)) 944 continue; 945 if (ifa->flags & (IFA_F_PERMANENT | IFA_F_NOPREFIXROUTE)) 946 return CLEANUP_PREFIX_RT_NOP; 947 948 action = CLEANUP_PREFIX_RT_EXPIRE; 949 950 spin_lock(&ifa->lock); 951 952 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ); 953 /* 954 * Note: Because this address is 955 * not permanent, lifetime < 956 * LONG_MAX / HZ here. 957 */ 958 if (time_before(*expires, ifa->tstamp + lifetime * HZ)) 959 *expires = ifa->tstamp + lifetime * HZ; 960 spin_unlock(&ifa->lock); 961 } 962 963 return action; 964 } 965 966 static void 967 cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long expires, bool del_rt) 968 { 969 struct rt6_info *rt; 970 971 rt = addrconf_get_prefix_route(&ifp->addr, 972 ifp->prefix_len, 973 ifp->idev->dev, 974 0, RTF_GATEWAY | RTF_DEFAULT); 975 if (rt) { 976 if (del_rt) 977 ip6_del_rt(rt); 978 else { 979 if (!(rt->rt6i_flags & RTF_EXPIRES)) 980 rt6_set_expires(rt, expires); 981 ip6_rt_put(rt); 982 } 983 } 984 } 985 986 987 /* This function wants to get referenced ifp and releases it before return */ 988 989 static void ipv6_del_addr(struct inet6_ifaddr *ifp) 990 { 991 int state; 992 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_NOP; 993 unsigned long expires; 994 995 ASSERT_RTNL(); 996 997 spin_lock_bh(&ifp->state_lock); 998 state = ifp->state; 999 ifp->state = INET6_IFADDR_STATE_DEAD; 1000 spin_unlock_bh(&ifp->state_lock); 1001 1002 if (state == INET6_IFADDR_STATE_DEAD) 1003 goto out; 1004 1005 spin_lock_bh(&addrconf_hash_lock); 1006 hlist_del_init_rcu(&ifp->addr_lst); 1007 spin_unlock_bh(&addrconf_hash_lock); 1008 1009 write_lock_bh(&ifp->idev->lock); 1010 1011 if (ifp->flags&IFA_F_TEMPORARY) { 1012 list_del(&ifp->tmp_list); 1013 if (ifp->ifpub) { 1014 in6_ifa_put(ifp->ifpub); 1015 ifp->ifpub = NULL; 1016 } 1017 __in6_ifa_put(ifp); 1018 } 1019 1020 if (ifp->flags & IFA_F_PERMANENT && !(ifp->flags & IFA_F_NOPREFIXROUTE)) 1021 action = check_cleanup_prefix_route(ifp, &expires); 1022 1023 list_del_init(&ifp->if_list); 1024 __in6_ifa_put(ifp); 1025 1026 write_unlock_bh(&ifp->idev->lock); 1027 1028 addrconf_del_dad_work(ifp); 1029 1030 ipv6_ifa_notify(RTM_DELADDR, ifp); 1031 1032 inet6addr_notifier_call_chain(NETDEV_DOWN, ifp); 1033 1034 if (action != CLEANUP_PREFIX_RT_NOP) { 1035 cleanup_prefix_route(ifp, expires, 1036 action == CLEANUP_PREFIX_RT_DEL); 1037 } 1038 1039 /* clean up prefsrc entries */ 1040 rt6_remove_prefsrc(ifp); 1041 out: 1042 in6_ifa_put(ifp); 1043 } 1044 1045 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift) 1046 { 1047 struct inet6_dev *idev = ifp->idev; 1048 struct in6_addr addr, *tmpaddr; 1049 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_tstamp, age; 1050 unsigned long regen_advance; 1051 int tmp_plen; 1052 int ret = 0; 1053 u32 addr_flags; 1054 unsigned long now = jiffies; 1055 1056 write_lock_bh(&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_bh(&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_bh(&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 tmp_tstamp = ifp->tstamp; 1099 spin_unlock_bh(&ifp->lock); 1100 1101 regen_advance = idev->cnf.regen_max_retry * 1102 idev->cnf.dad_transmits * 1103 NEIGH_VAR(idev->nd_parms, RETRANS_TIME) / HZ; 1104 write_unlock_bh(&idev->lock); 1105 1106 /* A temporary address is created only if this calculated Preferred 1107 * Lifetime is greater than REGEN_ADVANCE time units. In particular, 1108 * an implementation must not create a temporary address with a zero 1109 * Preferred Lifetime. 1110 * Use age calculation as in addrconf_verify to avoid unnecessary 1111 * temporary addresses being generated. 1112 */ 1113 age = (now - tmp_tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ; 1114 if (tmp_prefered_lft <= regen_advance + age) { 1115 in6_ifa_put(ifp); 1116 in6_dev_put(idev); 1117 ret = -1; 1118 goto out; 1119 } 1120 1121 addr_flags = IFA_F_TEMPORARY; 1122 /* set in addrconf_prefix_rcv() */ 1123 if (ifp->flags & IFA_F_OPTIMISTIC) 1124 addr_flags |= IFA_F_OPTIMISTIC; 1125 1126 ift = ipv6_add_addr(idev, &addr, NULL, tmp_plen, 1127 ipv6_addr_scope(&addr), addr_flags, 1128 tmp_valid_lft, tmp_prefered_lft); 1129 if (IS_ERR(ift)) { 1130 in6_ifa_put(ifp); 1131 in6_dev_put(idev); 1132 pr_info("%s: retry temporary address regeneration\n", __func__); 1133 tmpaddr = &addr; 1134 write_lock_bh(&idev->lock); 1135 goto retry; 1136 } 1137 1138 spin_lock_bh(&ift->lock); 1139 ift->ifpub = ifp; 1140 ift->cstamp = now; 1141 ift->tstamp = tmp_tstamp; 1142 spin_unlock_bh(&ift->lock); 1143 1144 addrconf_dad_start(ift); 1145 in6_ifa_put(ift); 1146 in6_dev_put(idev); 1147 out: 1148 return ret; 1149 } 1150 1151 /* 1152 * Choose an appropriate source address (RFC3484) 1153 */ 1154 enum { 1155 IPV6_SADDR_RULE_INIT = 0, 1156 IPV6_SADDR_RULE_LOCAL, 1157 IPV6_SADDR_RULE_SCOPE, 1158 IPV6_SADDR_RULE_PREFERRED, 1159 #ifdef CONFIG_IPV6_MIP6 1160 IPV6_SADDR_RULE_HOA, 1161 #endif 1162 IPV6_SADDR_RULE_OIF, 1163 IPV6_SADDR_RULE_LABEL, 1164 IPV6_SADDR_RULE_PRIVACY, 1165 IPV6_SADDR_RULE_ORCHID, 1166 IPV6_SADDR_RULE_PREFIX, 1167 IPV6_SADDR_RULE_MAX 1168 }; 1169 1170 struct ipv6_saddr_score { 1171 int rule; 1172 int addr_type; 1173 struct inet6_ifaddr *ifa; 1174 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX); 1175 int scopedist; 1176 int matchlen; 1177 }; 1178 1179 struct ipv6_saddr_dst { 1180 const struct in6_addr *addr; 1181 int ifindex; 1182 int scope; 1183 int label; 1184 unsigned int prefs; 1185 }; 1186 1187 static inline int ipv6_saddr_preferred(int type) 1188 { 1189 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK)) 1190 return 1; 1191 return 0; 1192 } 1193 1194 static int ipv6_get_saddr_eval(struct net *net, 1195 struct ipv6_saddr_score *score, 1196 struct ipv6_saddr_dst *dst, 1197 int i) 1198 { 1199 int ret; 1200 1201 if (i <= score->rule) { 1202 switch (i) { 1203 case IPV6_SADDR_RULE_SCOPE: 1204 ret = score->scopedist; 1205 break; 1206 case IPV6_SADDR_RULE_PREFIX: 1207 ret = score->matchlen; 1208 break; 1209 default: 1210 ret = !!test_bit(i, score->scorebits); 1211 } 1212 goto out; 1213 } 1214 1215 switch (i) { 1216 case IPV6_SADDR_RULE_INIT: 1217 /* Rule 0: remember if hiscore is not ready yet */ 1218 ret = !!score->ifa; 1219 break; 1220 case IPV6_SADDR_RULE_LOCAL: 1221 /* Rule 1: Prefer same address */ 1222 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr); 1223 break; 1224 case IPV6_SADDR_RULE_SCOPE: 1225 /* Rule 2: Prefer appropriate scope 1226 * 1227 * ret 1228 * ^ 1229 * -1 | d 15 1230 * ---+--+-+---> scope 1231 * | 1232 * | d is scope of the destination. 1233 * B-d | \ 1234 * | \ <- smaller scope is better if 1235 * B-15 | \ if scope is enough for destination. 1236 * | ret = B - scope (-1 <= scope >= d <= 15). 1237 * d-C-1 | / 1238 * |/ <- greater is better 1239 * -C / if scope is not enough for destination. 1240 * /| ret = scope - C (-1 <= d < scope <= 15). 1241 * 1242 * d - C - 1 < B -15 (for all -1 <= d <= 15). 1243 * C > d + 14 - B >= 15 + 14 - B = 29 - B. 1244 * Assume B = 0 and we get C > 29. 1245 */ 1246 ret = __ipv6_addr_src_scope(score->addr_type); 1247 if (ret >= dst->scope) 1248 ret = -ret; 1249 else 1250 ret -= 128; /* 30 is enough */ 1251 score->scopedist = ret; 1252 break; 1253 case IPV6_SADDR_RULE_PREFERRED: 1254 /* Rule 3: Avoid deprecated and optimistic addresses */ 1255 ret = ipv6_saddr_preferred(score->addr_type) || 1256 !(score->ifa->flags & (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC)); 1257 break; 1258 #ifdef CONFIG_IPV6_MIP6 1259 case IPV6_SADDR_RULE_HOA: 1260 { 1261 /* Rule 4: Prefer home address */ 1262 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA); 1263 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome; 1264 break; 1265 } 1266 #endif 1267 case IPV6_SADDR_RULE_OIF: 1268 /* Rule 5: Prefer outgoing interface */ 1269 ret = (!dst->ifindex || 1270 dst->ifindex == score->ifa->idev->dev->ifindex); 1271 break; 1272 case IPV6_SADDR_RULE_LABEL: 1273 /* Rule 6: Prefer matching label */ 1274 ret = ipv6_addr_label(net, 1275 &score->ifa->addr, score->addr_type, 1276 score->ifa->idev->dev->ifindex) == dst->label; 1277 break; 1278 case IPV6_SADDR_RULE_PRIVACY: 1279 { 1280 /* Rule 7: Prefer public address 1281 * Note: prefer temporary address if use_tempaddr >= 2 1282 */ 1283 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ? 1284 !!(dst->prefs & IPV6_PREFER_SRC_TMP) : 1285 score->ifa->idev->cnf.use_tempaddr >= 2; 1286 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp; 1287 break; 1288 } 1289 case IPV6_SADDR_RULE_ORCHID: 1290 /* Rule 8-: Prefer ORCHID vs ORCHID or 1291 * non-ORCHID vs non-ORCHID 1292 */ 1293 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^ 1294 ipv6_addr_orchid(dst->addr)); 1295 break; 1296 case IPV6_SADDR_RULE_PREFIX: 1297 /* Rule 8: Use longest matching prefix */ 1298 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr); 1299 if (ret > score->ifa->prefix_len) 1300 ret = score->ifa->prefix_len; 1301 score->matchlen = ret; 1302 break; 1303 default: 1304 ret = 0; 1305 } 1306 1307 if (ret) 1308 __set_bit(i, score->scorebits); 1309 score->rule = i; 1310 out: 1311 return ret; 1312 } 1313 1314 int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev, 1315 const struct in6_addr *daddr, unsigned int prefs, 1316 struct in6_addr *saddr) 1317 { 1318 struct ipv6_saddr_score scores[2], 1319 *score = &scores[0], *hiscore = &scores[1]; 1320 struct ipv6_saddr_dst dst; 1321 struct net_device *dev; 1322 int dst_type; 1323 1324 dst_type = __ipv6_addr_type(daddr); 1325 dst.addr = daddr; 1326 dst.ifindex = dst_dev ? dst_dev->ifindex : 0; 1327 dst.scope = __ipv6_addr_src_scope(dst_type); 1328 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex); 1329 dst.prefs = prefs; 1330 1331 hiscore->rule = -1; 1332 hiscore->ifa = NULL; 1333 1334 rcu_read_lock(); 1335 1336 for_each_netdev_rcu(net, dev) { 1337 struct inet6_dev *idev; 1338 1339 /* Candidate Source Address (section 4) 1340 * - multicast and link-local destination address, 1341 * the set of candidate source address MUST only 1342 * include addresses assigned to interfaces 1343 * belonging to the same link as the outgoing 1344 * interface. 1345 * (- For site-local destination addresses, the 1346 * set of candidate source addresses MUST only 1347 * include addresses assigned to interfaces 1348 * belonging to the same site as the outgoing 1349 * interface.) 1350 */ 1351 if (((dst_type & IPV6_ADDR_MULTICAST) || 1352 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL) && 1353 dst.ifindex && dev->ifindex != dst.ifindex) 1354 continue; 1355 1356 idev = __in6_dev_get(dev); 1357 if (!idev) 1358 continue; 1359 1360 read_lock_bh(&idev->lock); 1361 list_for_each_entry(score->ifa, &idev->addr_list, if_list) { 1362 int i; 1363 1364 /* 1365 * - Tentative Address (RFC2462 section 5.4) 1366 * - A tentative address is not considered 1367 * "assigned to an interface" in the traditional 1368 * sense, unless it is also flagged as optimistic. 1369 * - Candidate Source Address (section 4) 1370 * - In any case, anycast addresses, multicast 1371 * addresses, and the unspecified address MUST 1372 * NOT be included in a candidate set. 1373 */ 1374 if ((score->ifa->flags & IFA_F_TENTATIVE) && 1375 (!(score->ifa->flags & IFA_F_OPTIMISTIC))) 1376 continue; 1377 1378 score->addr_type = __ipv6_addr_type(&score->ifa->addr); 1379 1380 if (unlikely(score->addr_type == IPV6_ADDR_ANY || 1381 score->addr_type & IPV6_ADDR_MULTICAST)) { 1382 LIMIT_NETDEBUG(KERN_DEBUG 1383 "ADDRCONF: unspecified / multicast address " 1384 "assigned as unicast address on %s", 1385 dev->name); 1386 continue; 1387 } 1388 1389 score->rule = -1; 1390 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX); 1391 1392 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) { 1393 int minihiscore, miniscore; 1394 1395 minihiscore = ipv6_get_saddr_eval(net, hiscore, &dst, i); 1396 miniscore = ipv6_get_saddr_eval(net, score, &dst, i); 1397 1398 if (minihiscore > miniscore) { 1399 if (i == IPV6_SADDR_RULE_SCOPE && 1400 score->scopedist > 0) { 1401 /* 1402 * special case: 1403 * each remaining entry 1404 * has too small (not enough) 1405 * scope, because ifa entries 1406 * are sorted by their scope 1407 * values. 1408 */ 1409 goto try_nextdev; 1410 } 1411 break; 1412 } else if (minihiscore < miniscore) { 1413 if (hiscore->ifa) 1414 in6_ifa_put(hiscore->ifa); 1415 1416 in6_ifa_hold(score->ifa); 1417 1418 swap(hiscore, score); 1419 1420 /* restore our iterator */ 1421 score->ifa = hiscore->ifa; 1422 1423 break; 1424 } 1425 } 1426 } 1427 try_nextdev: 1428 read_unlock_bh(&idev->lock); 1429 } 1430 rcu_read_unlock(); 1431 1432 if (!hiscore->ifa) 1433 return -EADDRNOTAVAIL; 1434 1435 *saddr = hiscore->ifa->addr; 1436 in6_ifa_put(hiscore->ifa); 1437 return 0; 1438 } 1439 EXPORT_SYMBOL(ipv6_dev_get_saddr); 1440 1441 int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr, 1442 u32 banned_flags) 1443 { 1444 struct inet6_ifaddr *ifp; 1445 int err = -EADDRNOTAVAIL; 1446 1447 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) { 1448 if (ifp->scope > IFA_LINK) 1449 break; 1450 if (ifp->scope == IFA_LINK && 1451 !(ifp->flags & banned_flags)) { 1452 *addr = ifp->addr; 1453 err = 0; 1454 break; 1455 } 1456 } 1457 return err; 1458 } 1459 1460 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr, 1461 u32 banned_flags) 1462 { 1463 struct inet6_dev *idev; 1464 int err = -EADDRNOTAVAIL; 1465 1466 rcu_read_lock(); 1467 idev = __in6_dev_get(dev); 1468 if (idev) { 1469 read_lock_bh(&idev->lock); 1470 err = __ipv6_get_lladdr(idev, addr, banned_flags); 1471 read_unlock_bh(&idev->lock); 1472 } 1473 rcu_read_unlock(); 1474 return err; 1475 } 1476 1477 static int ipv6_count_addresses(struct inet6_dev *idev) 1478 { 1479 int cnt = 0; 1480 struct inet6_ifaddr *ifp; 1481 1482 read_lock_bh(&idev->lock); 1483 list_for_each_entry(ifp, &idev->addr_list, if_list) 1484 cnt++; 1485 read_unlock_bh(&idev->lock); 1486 return cnt; 1487 } 1488 1489 int ipv6_chk_addr(struct net *net, const struct in6_addr *addr, 1490 const struct net_device *dev, int strict) 1491 { 1492 struct inet6_ifaddr *ifp; 1493 unsigned int hash = inet6_addr_hash(addr); 1494 1495 rcu_read_lock_bh(); 1496 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) { 1497 if (!net_eq(dev_net(ifp->idev->dev), net)) 1498 continue; 1499 if (ipv6_addr_equal(&ifp->addr, addr) && 1500 !(ifp->flags&IFA_F_TENTATIVE) && 1501 (dev == NULL || ifp->idev->dev == dev || 1502 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) { 1503 rcu_read_unlock_bh(); 1504 return 1; 1505 } 1506 } 1507 1508 rcu_read_unlock_bh(); 1509 return 0; 1510 } 1511 EXPORT_SYMBOL(ipv6_chk_addr); 1512 1513 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr, 1514 struct net_device *dev) 1515 { 1516 unsigned int hash = inet6_addr_hash(addr); 1517 struct inet6_ifaddr *ifp; 1518 1519 hlist_for_each_entry(ifp, &inet6_addr_lst[hash], addr_lst) { 1520 if (!net_eq(dev_net(ifp->idev->dev), net)) 1521 continue; 1522 if (ipv6_addr_equal(&ifp->addr, addr)) { 1523 if (dev == NULL || ifp->idev->dev == dev) 1524 return true; 1525 } 1526 } 1527 return false; 1528 } 1529 1530 /* Compares an address/prefix_len with addresses on device @dev. 1531 * If one is found it returns true. 1532 */ 1533 bool ipv6_chk_custom_prefix(const struct in6_addr *addr, 1534 const unsigned int prefix_len, struct net_device *dev) 1535 { 1536 struct inet6_dev *idev; 1537 struct inet6_ifaddr *ifa; 1538 bool ret = false; 1539 1540 rcu_read_lock(); 1541 idev = __in6_dev_get(dev); 1542 if (idev) { 1543 read_lock_bh(&idev->lock); 1544 list_for_each_entry(ifa, &idev->addr_list, if_list) { 1545 ret = ipv6_prefix_equal(addr, &ifa->addr, prefix_len); 1546 if (ret) 1547 break; 1548 } 1549 read_unlock_bh(&idev->lock); 1550 } 1551 rcu_read_unlock(); 1552 1553 return ret; 1554 } 1555 EXPORT_SYMBOL(ipv6_chk_custom_prefix); 1556 1557 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev) 1558 { 1559 struct inet6_dev *idev; 1560 struct inet6_ifaddr *ifa; 1561 int onlink; 1562 1563 onlink = 0; 1564 rcu_read_lock(); 1565 idev = __in6_dev_get(dev); 1566 if (idev) { 1567 read_lock_bh(&idev->lock); 1568 list_for_each_entry(ifa, &idev->addr_list, if_list) { 1569 onlink = ipv6_prefix_equal(addr, &ifa->addr, 1570 ifa->prefix_len); 1571 if (onlink) 1572 break; 1573 } 1574 read_unlock_bh(&idev->lock); 1575 } 1576 rcu_read_unlock(); 1577 return onlink; 1578 } 1579 EXPORT_SYMBOL(ipv6_chk_prefix); 1580 1581 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr, 1582 struct net_device *dev, int strict) 1583 { 1584 struct inet6_ifaddr *ifp, *result = NULL; 1585 unsigned int hash = inet6_addr_hash(addr); 1586 1587 rcu_read_lock_bh(); 1588 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) { 1589 if (!net_eq(dev_net(ifp->idev->dev), net)) 1590 continue; 1591 if (ipv6_addr_equal(&ifp->addr, addr)) { 1592 if (dev == NULL || ifp->idev->dev == dev || 1593 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) { 1594 result = ifp; 1595 in6_ifa_hold(ifp); 1596 break; 1597 } 1598 } 1599 } 1600 rcu_read_unlock_bh(); 1601 1602 return result; 1603 } 1604 1605 /* Gets referenced address, destroys ifaddr */ 1606 1607 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed) 1608 { 1609 if (ifp->flags&IFA_F_PERMANENT) { 1610 spin_lock_bh(&ifp->lock); 1611 addrconf_del_dad_work(ifp); 1612 ifp->flags |= IFA_F_TENTATIVE; 1613 if (dad_failed) 1614 ifp->flags |= IFA_F_DADFAILED; 1615 spin_unlock_bh(&ifp->lock); 1616 if (dad_failed) 1617 ipv6_ifa_notify(0, ifp); 1618 in6_ifa_put(ifp); 1619 } else if (ifp->flags&IFA_F_TEMPORARY) { 1620 struct inet6_ifaddr *ifpub; 1621 spin_lock_bh(&ifp->lock); 1622 ifpub = ifp->ifpub; 1623 if (ifpub) { 1624 in6_ifa_hold(ifpub); 1625 spin_unlock_bh(&ifp->lock); 1626 ipv6_create_tempaddr(ifpub, ifp); 1627 in6_ifa_put(ifpub); 1628 } else { 1629 spin_unlock_bh(&ifp->lock); 1630 } 1631 ipv6_del_addr(ifp); 1632 } else { 1633 ipv6_del_addr(ifp); 1634 } 1635 } 1636 1637 static int addrconf_dad_end(struct inet6_ifaddr *ifp) 1638 { 1639 int err = -ENOENT; 1640 1641 spin_lock_bh(&ifp->state_lock); 1642 if (ifp->state == INET6_IFADDR_STATE_DAD) { 1643 ifp->state = INET6_IFADDR_STATE_POSTDAD; 1644 err = 0; 1645 } 1646 spin_unlock_bh(&ifp->state_lock); 1647 1648 return err; 1649 } 1650 1651 void addrconf_dad_failure(struct inet6_ifaddr *ifp) 1652 { 1653 struct inet6_dev *idev = ifp->idev; 1654 1655 if (addrconf_dad_end(ifp)) { 1656 in6_ifa_put(ifp); 1657 return; 1658 } 1659 1660 net_info_ratelimited("%s: IPv6 duplicate address %pI6c detected!\n", 1661 ifp->idev->dev->name, &ifp->addr); 1662 1663 if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6) { 1664 struct in6_addr addr; 1665 1666 addr.s6_addr32[0] = htonl(0xfe800000); 1667 addr.s6_addr32[1] = 0; 1668 1669 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) && 1670 ipv6_addr_equal(&ifp->addr, &addr)) { 1671 /* DAD failed for link-local based on MAC address */ 1672 idev->cnf.disable_ipv6 = 1; 1673 1674 pr_info("%s: IPv6 being disabled!\n", 1675 ifp->idev->dev->name); 1676 } 1677 } 1678 1679 spin_lock_bh(&ifp->state_lock); 1680 /* transition from _POSTDAD to _ERRDAD */ 1681 ifp->state = INET6_IFADDR_STATE_ERRDAD; 1682 spin_unlock_bh(&ifp->state_lock); 1683 1684 addrconf_mod_dad_work(ifp, 0); 1685 } 1686 1687 /* Join to solicited addr multicast group. */ 1688 1689 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr) 1690 { 1691 struct in6_addr maddr; 1692 1693 ASSERT_RTNL(); 1694 1695 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP)) 1696 return; 1697 1698 addrconf_addr_solict_mult(addr, &maddr); 1699 ipv6_dev_mc_inc(dev, &maddr); 1700 } 1701 1702 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr) 1703 { 1704 struct in6_addr maddr; 1705 1706 ASSERT_RTNL(); 1707 1708 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP)) 1709 return; 1710 1711 addrconf_addr_solict_mult(addr, &maddr); 1712 __ipv6_dev_mc_dec(idev, &maddr); 1713 } 1714 1715 static void addrconf_join_anycast(struct inet6_ifaddr *ifp) 1716 { 1717 struct in6_addr addr; 1718 1719 ASSERT_RTNL(); 1720 1721 if (ifp->prefix_len >= 127) /* RFC 6164 */ 1722 return; 1723 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len); 1724 if (ipv6_addr_any(&addr)) 1725 return; 1726 ipv6_dev_ac_inc(ifp->idev->dev, &addr); 1727 } 1728 1729 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp) 1730 { 1731 struct in6_addr addr; 1732 1733 ASSERT_RTNL(); 1734 1735 if (ifp->prefix_len >= 127) /* RFC 6164 */ 1736 return; 1737 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len); 1738 if (ipv6_addr_any(&addr)) 1739 return; 1740 __ipv6_dev_ac_dec(ifp->idev, &addr); 1741 } 1742 1743 static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev) 1744 { 1745 if (dev->addr_len != ETH_ALEN) 1746 return -1; 1747 memcpy(eui, dev->dev_addr, 3); 1748 memcpy(eui + 5, dev->dev_addr + 3, 3); 1749 1750 /* 1751 * The zSeries OSA network cards can be shared among various 1752 * OS instances, but the OSA cards have only one MAC address. 1753 * This leads to duplicate address conflicts in conjunction 1754 * with IPv6 if more than one instance uses the same card. 1755 * 1756 * The driver for these cards can deliver a unique 16-bit 1757 * identifier for each instance sharing the same card. It is 1758 * placed instead of 0xFFFE in the interface identifier. The 1759 * "u" bit of the interface identifier is not inverted in this 1760 * case. Hence the resulting interface identifier has local 1761 * scope according to RFC2373. 1762 */ 1763 if (dev->dev_id) { 1764 eui[3] = (dev->dev_id >> 8) & 0xFF; 1765 eui[4] = dev->dev_id & 0xFF; 1766 } else { 1767 eui[3] = 0xFF; 1768 eui[4] = 0xFE; 1769 eui[0] ^= 2; 1770 } 1771 return 0; 1772 } 1773 1774 static int addrconf_ifid_eui64(u8 *eui, struct net_device *dev) 1775 { 1776 if (dev->addr_len != IEEE802154_ADDR_LEN) 1777 return -1; 1778 memcpy(eui, dev->dev_addr, 8); 1779 eui[0] ^= 2; 1780 return 0; 1781 } 1782 1783 static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev) 1784 { 1785 union fwnet_hwaddr *ha; 1786 1787 if (dev->addr_len != FWNET_ALEN) 1788 return -1; 1789 1790 ha = (union fwnet_hwaddr *)dev->dev_addr; 1791 1792 memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id)); 1793 eui[0] ^= 2; 1794 return 0; 1795 } 1796 1797 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev) 1798 { 1799 /* XXX: inherit EUI-64 from other interface -- yoshfuji */ 1800 if (dev->addr_len != ARCNET_ALEN) 1801 return -1; 1802 memset(eui, 0, 7); 1803 eui[7] = *(u8 *)dev->dev_addr; 1804 return 0; 1805 } 1806 1807 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev) 1808 { 1809 if (dev->addr_len != INFINIBAND_ALEN) 1810 return -1; 1811 memcpy(eui, dev->dev_addr + 12, 8); 1812 eui[0] |= 2; 1813 return 0; 1814 } 1815 1816 static int __ipv6_isatap_ifid(u8 *eui, __be32 addr) 1817 { 1818 if (addr == 0) 1819 return -1; 1820 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) || 1821 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) || 1822 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) || 1823 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) || 1824 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) || 1825 ipv4_is_lbcast(addr)) ? 0x00 : 0x02; 1826 eui[1] = 0; 1827 eui[2] = 0x5E; 1828 eui[3] = 0xFE; 1829 memcpy(eui + 4, &addr, 4); 1830 return 0; 1831 } 1832 1833 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev) 1834 { 1835 if (dev->priv_flags & IFF_ISATAP) 1836 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr); 1837 return -1; 1838 } 1839 1840 static int addrconf_ifid_gre(u8 *eui, struct net_device *dev) 1841 { 1842 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr); 1843 } 1844 1845 static int addrconf_ifid_ip6tnl(u8 *eui, struct net_device *dev) 1846 { 1847 memcpy(eui, dev->perm_addr, 3); 1848 memcpy(eui + 5, dev->perm_addr + 3, 3); 1849 eui[3] = 0xFF; 1850 eui[4] = 0xFE; 1851 eui[0] ^= 2; 1852 return 0; 1853 } 1854 1855 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev) 1856 { 1857 switch (dev->type) { 1858 case ARPHRD_ETHER: 1859 case ARPHRD_FDDI: 1860 return addrconf_ifid_eui48(eui, dev); 1861 case ARPHRD_ARCNET: 1862 return addrconf_ifid_arcnet(eui, dev); 1863 case ARPHRD_INFINIBAND: 1864 return addrconf_ifid_infiniband(eui, dev); 1865 case ARPHRD_SIT: 1866 return addrconf_ifid_sit(eui, dev); 1867 case ARPHRD_IPGRE: 1868 return addrconf_ifid_gre(eui, dev); 1869 case ARPHRD_6LOWPAN: 1870 case ARPHRD_IEEE802154: 1871 return addrconf_ifid_eui64(eui, dev); 1872 case ARPHRD_IEEE1394: 1873 return addrconf_ifid_ieee1394(eui, dev); 1874 case ARPHRD_TUNNEL6: 1875 return addrconf_ifid_ip6tnl(eui, dev); 1876 } 1877 return -1; 1878 } 1879 1880 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev) 1881 { 1882 int err = -1; 1883 struct inet6_ifaddr *ifp; 1884 1885 read_lock_bh(&idev->lock); 1886 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) { 1887 if (ifp->scope > IFA_LINK) 1888 break; 1889 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) { 1890 memcpy(eui, ifp->addr.s6_addr+8, 8); 1891 err = 0; 1892 break; 1893 } 1894 } 1895 read_unlock_bh(&idev->lock); 1896 return err; 1897 } 1898 1899 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */ 1900 static void __ipv6_regen_rndid(struct inet6_dev *idev) 1901 { 1902 regen: 1903 get_random_bytes(idev->rndid, sizeof(idev->rndid)); 1904 idev->rndid[0] &= ~0x02; 1905 1906 /* 1907 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>: 1908 * check if generated address is not inappropriate 1909 * 1910 * - Reserved subnet anycast (RFC 2526) 1911 * 11111101 11....11 1xxxxxxx 1912 * - ISATAP (RFC4214) 6.1 1913 * 00-00-5E-FE-xx-xx-xx-xx 1914 * - value 0 1915 * - XXX: already assigned to an address on the device 1916 */ 1917 if (idev->rndid[0] == 0xfd && 1918 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff && 1919 (idev->rndid[7]&0x80)) 1920 goto regen; 1921 if ((idev->rndid[0]|idev->rndid[1]) == 0) { 1922 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe) 1923 goto regen; 1924 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00) 1925 goto regen; 1926 } 1927 } 1928 1929 static void ipv6_regen_rndid(unsigned long data) 1930 { 1931 struct inet6_dev *idev = (struct inet6_dev *) data; 1932 unsigned long expires; 1933 1934 rcu_read_lock_bh(); 1935 write_lock_bh(&idev->lock); 1936 1937 if (idev->dead) 1938 goto out; 1939 1940 __ipv6_regen_rndid(idev); 1941 1942 expires = jiffies + 1943 idev->cnf.temp_prefered_lft * HZ - 1944 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * 1945 NEIGH_VAR(idev->nd_parms, RETRANS_TIME) - 1946 idev->cnf.max_desync_factor * HZ; 1947 if (time_before(expires, jiffies)) { 1948 pr_warn("%s: too short regeneration interval; timer disabled for %s\n", 1949 __func__, idev->dev->name); 1950 goto out; 1951 } 1952 1953 if (!mod_timer(&idev->regen_timer, expires)) 1954 in6_dev_hold(idev); 1955 1956 out: 1957 write_unlock_bh(&idev->lock); 1958 rcu_read_unlock_bh(); 1959 in6_dev_put(idev); 1960 } 1961 1962 static void __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) 1963 { 1964 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0) 1965 __ipv6_regen_rndid(idev); 1966 } 1967 1968 /* 1969 * Add prefix route. 1970 */ 1971 1972 static void 1973 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev, 1974 unsigned long expires, u32 flags) 1975 { 1976 struct fib6_config cfg = { 1977 .fc_table = RT6_TABLE_PREFIX, 1978 .fc_metric = IP6_RT_PRIO_ADDRCONF, 1979 .fc_ifindex = dev->ifindex, 1980 .fc_expires = expires, 1981 .fc_dst_len = plen, 1982 .fc_flags = RTF_UP | flags, 1983 .fc_nlinfo.nl_net = dev_net(dev), 1984 .fc_protocol = RTPROT_KERNEL, 1985 }; 1986 1987 cfg.fc_dst = *pfx; 1988 1989 /* Prevent useless cloning on PtP SIT. 1990 This thing is done here expecting that the whole 1991 class of non-broadcast devices need not cloning. 1992 */ 1993 #if IS_ENABLED(CONFIG_IPV6_SIT) 1994 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT)) 1995 cfg.fc_flags |= RTF_NONEXTHOP; 1996 #endif 1997 1998 ip6_route_add(&cfg); 1999 } 2000 2001 2002 static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx, 2003 int plen, 2004 const struct net_device *dev, 2005 u32 flags, u32 noflags) 2006 { 2007 struct fib6_node *fn; 2008 struct rt6_info *rt = NULL; 2009 struct fib6_table *table; 2010 2011 table = fib6_get_table(dev_net(dev), RT6_TABLE_PREFIX); 2012 if (table == NULL) 2013 return NULL; 2014 2015 read_lock_bh(&table->tb6_lock); 2016 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0); 2017 if (!fn) 2018 goto out; 2019 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) { 2020 if (rt->dst.dev->ifindex != dev->ifindex) 2021 continue; 2022 if ((rt->rt6i_flags & flags) != flags) 2023 continue; 2024 if ((rt->rt6i_flags & noflags) != 0) 2025 continue; 2026 dst_hold(&rt->dst); 2027 break; 2028 } 2029 out: 2030 read_unlock_bh(&table->tb6_lock); 2031 return rt; 2032 } 2033 2034 2035 /* Create "default" multicast route to the interface */ 2036 2037 static void addrconf_add_mroute(struct net_device *dev) 2038 { 2039 struct fib6_config cfg = { 2040 .fc_table = RT6_TABLE_LOCAL, 2041 .fc_metric = IP6_RT_PRIO_ADDRCONF, 2042 .fc_ifindex = dev->ifindex, 2043 .fc_dst_len = 8, 2044 .fc_flags = RTF_UP, 2045 .fc_nlinfo.nl_net = dev_net(dev), 2046 }; 2047 2048 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0); 2049 2050 ip6_route_add(&cfg); 2051 } 2052 2053 static struct inet6_dev *addrconf_add_dev(struct net_device *dev) 2054 { 2055 struct inet6_dev *idev; 2056 2057 ASSERT_RTNL(); 2058 2059 idev = ipv6_find_idev(dev); 2060 if (!idev) 2061 return ERR_PTR(-ENOBUFS); 2062 2063 if (idev->cnf.disable_ipv6) 2064 return ERR_PTR(-EACCES); 2065 2066 /* Add default multicast route */ 2067 if (!(dev->flags & IFF_LOOPBACK)) 2068 addrconf_add_mroute(dev); 2069 2070 return idev; 2071 } 2072 2073 static void manage_tempaddrs(struct inet6_dev *idev, 2074 struct inet6_ifaddr *ifp, 2075 __u32 valid_lft, __u32 prefered_lft, 2076 bool create, unsigned long now) 2077 { 2078 u32 flags; 2079 struct inet6_ifaddr *ift; 2080 2081 read_lock_bh(&idev->lock); 2082 /* update all temporary addresses in the list */ 2083 list_for_each_entry(ift, &idev->tempaddr_list, tmp_list) { 2084 int age, max_valid, max_prefered; 2085 2086 if (ifp != ift->ifpub) 2087 continue; 2088 2089 /* RFC 4941 section 3.3: 2090 * If a received option will extend the lifetime of a public 2091 * address, the lifetimes of temporary addresses should 2092 * be extended, subject to the overall constraint that no 2093 * temporary addresses should ever remain "valid" or "preferred" 2094 * for a time longer than (TEMP_VALID_LIFETIME) or 2095 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), respectively. 2096 */ 2097 age = (now - ift->cstamp) / HZ; 2098 max_valid = idev->cnf.temp_valid_lft - age; 2099 if (max_valid < 0) 2100 max_valid = 0; 2101 2102 max_prefered = idev->cnf.temp_prefered_lft - 2103 idev->cnf.max_desync_factor - age; 2104 if (max_prefered < 0) 2105 max_prefered = 0; 2106 2107 if (valid_lft > max_valid) 2108 valid_lft = max_valid; 2109 2110 if (prefered_lft > max_prefered) 2111 prefered_lft = max_prefered; 2112 2113 spin_lock(&ift->lock); 2114 flags = ift->flags; 2115 ift->valid_lft = valid_lft; 2116 ift->prefered_lft = prefered_lft; 2117 ift->tstamp = now; 2118 if (prefered_lft > 0) 2119 ift->flags &= ~IFA_F_DEPRECATED; 2120 2121 spin_unlock(&ift->lock); 2122 if (!(flags&IFA_F_TENTATIVE)) 2123 ipv6_ifa_notify(0, ift); 2124 } 2125 2126 if ((create || list_empty(&idev->tempaddr_list)) && 2127 idev->cnf.use_tempaddr > 0) { 2128 /* When a new public address is created as described 2129 * in [ADDRCONF], also create a new temporary address. 2130 * Also create a temporary address if it's enabled but 2131 * no temporary address currently exists. 2132 */ 2133 read_unlock_bh(&idev->lock); 2134 ipv6_create_tempaddr(ifp, NULL); 2135 } else { 2136 read_unlock_bh(&idev->lock); 2137 } 2138 } 2139 2140 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao) 2141 { 2142 struct prefix_info *pinfo; 2143 __u32 valid_lft; 2144 __u32 prefered_lft; 2145 int addr_type; 2146 struct inet6_dev *in6_dev; 2147 struct net *net = dev_net(dev); 2148 2149 pinfo = (struct prefix_info *) opt; 2150 2151 if (len < sizeof(struct prefix_info)) { 2152 ADBG("addrconf: prefix option too short\n"); 2153 return; 2154 } 2155 2156 /* 2157 * Validation checks ([ADDRCONF], page 19) 2158 */ 2159 2160 addr_type = ipv6_addr_type(&pinfo->prefix); 2161 2162 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL)) 2163 return; 2164 2165 valid_lft = ntohl(pinfo->valid); 2166 prefered_lft = ntohl(pinfo->prefered); 2167 2168 if (prefered_lft > valid_lft) { 2169 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n"); 2170 return; 2171 } 2172 2173 in6_dev = in6_dev_get(dev); 2174 2175 if (in6_dev == NULL) { 2176 net_dbg_ratelimited("addrconf: device %s not configured\n", 2177 dev->name); 2178 return; 2179 } 2180 2181 /* 2182 * Two things going on here: 2183 * 1) Add routes for on-link prefixes 2184 * 2) Configure prefixes with the auto flag set 2185 */ 2186 2187 if (pinfo->onlink) { 2188 struct rt6_info *rt; 2189 unsigned long rt_expires; 2190 2191 /* Avoid arithmetic overflow. Really, we could 2192 * save rt_expires in seconds, likely valid_lft, 2193 * but it would require division in fib gc, that it 2194 * not good. 2195 */ 2196 if (HZ > USER_HZ) 2197 rt_expires = addrconf_timeout_fixup(valid_lft, HZ); 2198 else 2199 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ); 2200 2201 if (addrconf_finite_timeout(rt_expires)) 2202 rt_expires *= HZ; 2203 2204 rt = addrconf_get_prefix_route(&pinfo->prefix, 2205 pinfo->prefix_len, 2206 dev, 2207 RTF_ADDRCONF | RTF_PREFIX_RT, 2208 RTF_GATEWAY | RTF_DEFAULT); 2209 2210 if (rt) { 2211 /* Autoconf prefix route */ 2212 if (valid_lft == 0) { 2213 ip6_del_rt(rt); 2214 rt = NULL; 2215 } else if (addrconf_finite_timeout(rt_expires)) { 2216 /* not infinity */ 2217 rt6_set_expires(rt, jiffies + rt_expires); 2218 } else { 2219 rt6_clean_expires(rt); 2220 } 2221 } else if (valid_lft) { 2222 clock_t expires = 0; 2223 int flags = RTF_ADDRCONF | RTF_PREFIX_RT; 2224 if (addrconf_finite_timeout(rt_expires)) { 2225 /* not infinity */ 2226 flags |= RTF_EXPIRES; 2227 expires = jiffies_to_clock_t(rt_expires); 2228 } 2229 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len, 2230 dev, expires, flags); 2231 } 2232 ip6_rt_put(rt); 2233 } 2234 2235 /* Try to figure out our local address for this prefix */ 2236 2237 if (pinfo->autoconf && in6_dev->cnf.autoconf) { 2238 struct inet6_ifaddr *ifp; 2239 struct in6_addr addr; 2240 int create = 0, update_lft = 0; 2241 bool tokenized = false; 2242 2243 if (pinfo->prefix_len == 64) { 2244 memcpy(&addr, &pinfo->prefix, 8); 2245 2246 if (!ipv6_addr_any(&in6_dev->token)) { 2247 read_lock_bh(&in6_dev->lock); 2248 memcpy(addr.s6_addr + 8, 2249 in6_dev->token.s6_addr + 8, 8); 2250 read_unlock_bh(&in6_dev->lock); 2251 tokenized = true; 2252 } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) && 2253 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) { 2254 in6_dev_put(in6_dev); 2255 return; 2256 } 2257 goto ok; 2258 } 2259 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n", 2260 pinfo->prefix_len); 2261 in6_dev_put(in6_dev); 2262 return; 2263 2264 ok: 2265 2266 ifp = ipv6_get_ifaddr(net, &addr, dev, 1); 2267 2268 if (ifp == NULL && valid_lft) { 2269 int max_addresses = in6_dev->cnf.max_addresses; 2270 u32 addr_flags = 0; 2271 2272 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 2273 if (in6_dev->cnf.optimistic_dad && 2274 !net->ipv6.devconf_all->forwarding && sllao) 2275 addr_flags = IFA_F_OPTIMISTIC; 2276 #endif 2277 2278 /* Do not allow to create too much of autoconfigured 2279 * addresses; this would be too easy way to crash kernel. 2280 */ 2281 if (!max_addresses || 2282 ipv6_count_addresses(in6_dev) < max_addresses) 2283 ifp = ipv6_add_addr(in6_dev, &addr, NULL, 2284 pinfo->prefix_len, 2285 addr_type&IPV6_ADDR_SCOPE_MASK, 2286 addr_flags, valid_lft, 2287 prefered_lft); 2288 2289 if (IS_ERR_OR_NULL(ifp)) { 2290 in6_dev_put(in6_dev); 2291 return; 2292 } 2293 2294 update_lft = 0; 2295 create = 1; 2296 spin_lock_bh(&ifp->lock); 2297 ifp->flags |= IFA_F_MANAGETEMPADDR; 2298 ifp->cstamp = jiffies; 2299 ifp->tokenized = tokenized; 2300 spin_unlock_bh(&ifp->lock); 2301 addrconf_dad_start(ifp); 2302 } 2303 2304 if (ifp) { 2305 u32 flags; 2306 unsigned long now; 2307 u32 stored_lft; 2308 2309 /* update lifetime (RFC2462 5.5.3 e) */ 2310 spin_lock(&ifp->lock); 2311 now = jiffies; 2312 if (ifp->valid_lft > (now - ifp->tstamp) / HZ) 2313 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ; 2314 else 2315 stored_lft = 0; 2316 if (!update_lft && !create && stored_lft) { 2317 const u32 minimum_lft = min( 2318 stored_lft, (u32)MIN_VALID_LIFETIME); 2319 valid_lft = max(valid_lft, minimum_lft); 2320 2321 /* RFC4862 Section 5.5.3e: 2322 * "Note that the preferred lifetime of the 2323 * corresponding address is always reset to 2324 * the Preferred Lifetime in the received 2325 * Prefix Information option, regardless of 2326 * whether the valid lifetime is also reset or 2327 * ignored." 2328 * 2329 * So we should always update prefered_lft here. 2330 */ 2331 update_lft = 1; 2332 } 2333 2334 if (update_lft) { 2335 ifp->valid_lft = valid_lft; 2336 ifp->prefered_lft = prefered_lft; 2337 ifp->tstamp = now; 2338 flags = ifp->flags; 2339 ifp->flags &= ~IFA_F_DEPRECATED; 2340 spin_unlock(&ifp->lock); 2341 2342 if (!(flags&IFA_F_TENTATIVE)) 2343 ipv6_ifa_notify(0, ifp); 2344 } else 2345 spin_unlock(&ifp->lock); 2346 2347 manage_tempaddrs(in6_dev, ifp, valid_lft, prefered_lft, 2348 create, now); 2349 2350 in6_ifa_put(ifp); 2351 addrconf_verify(); 2352 } 2353 } 2354 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo); 2355 in6_dev_put(in6_dev); 2356 } 2357 2358 /* 2359 * Set destination address. 2360 * Special case for SIT interfaces where we create a new "virtual" 2361 * device. 2362 */ 2363 int addrconf_set_dstaddr(struct net *net, void __user *arg) 2364 { 2365 struct in6_ifreq ireq; 2366 struct net_device *dev; 2367 int err = -EINVAL; 2368 2369 rtnl_lock(); 2370 2371 err = -EFAULT; 2372 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2373 goto err_exit; 2374 2375 dev = __dev_get_by_index(net, ireq.ifr6_ifindex); 2376 2377 err = -ENODEV; 2378 if (dev == NULL) 2379 goto err_exit; 2380 2381 #if IS_ENABLED(CONFIG_IPV6_SIT) 2382 if (dev->type == ARPHRD_SIT) { 2383 const struct net_device_ops *ops = dev->netdev_ops; 2384 struct ifreq ifr; 2385 struct ip_tunnel_parm p; 2386 2387 err = -EADDRNOTAVAIL; 2388 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4)) 2389 goto err_exit; 2390 2391 memset(&p, 0, sizeof(p)); 2392 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3]; 2393 p.iph.saddr = 0; 2394 p.iph.version = 4; 2395 p.iph.ihl = 5; 2396 p.iph.protocol = IPPROTO_IPV6; 2397 p.iph.ttl = 64; 2398 ifr.ifr_ifru.ifru_data = (__force void __user *)&p; 2399 2400 if (ops->ndo_do_ioctl) { 2401 mm_segment_t oldfs = get_fs(); 2402 2403 set_fs(KERNEL_DS); 2404 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL); 2405 set_fs(oldfs); 2406 } else 2407 err = -EOPNOTSUPP; 2408 2409 if (err == 0) { 2410 err = -ENOBUFS; 2411 dev = __dev_get_by_name(net, p.name); 2412 if (!dev) 2413 goto err_exit; 2414 err = dev_open(dev); 2415 } 2416 } 2417 #endif 2418 2419 err_exit: 2420 rtnl_unlock(); 2421 return err; 2422 } 2423 2424 /* 2425 * Manual configuration of address on an interface 2426 */ 2427 static int inet6_addr_add(struct net *net, int ifindex, 2428 const struct in6_addr *pfx, 2429 const struct in6_addr *peer_pfx, 2430 unsigned int plen, __u32 ifa_flags, 2431 __u32 prefered_lft, __u32 valid_lft) 2432 { 2433 struct inet6_ifaddr *ifp; 2434 struct inet6_dev *idev; 2435 struct net_device *dev; 2436 int scope; 2437 u32 flags; 2438 clock_t expires; 2439 unsigned long timeout; 2440 2441 ASSERT_RTNL(); 2442 2443 if (plen > 128) 2444 return -EINVAL; 2445 2446 /* check the lifetime */ 2447 if (!valid_lft || prefered_lft > valid_lft) 2448 return -EINVAL; 2449 2450 if (ifa_flags & IFA_F_MANAGETEMPADDR && plen != 64) 2451 return -EINVAL; 2452 2453 dev = __dev_get_by_index(net, ifindex); 2454 if (!dev) 2455 return -ENODEV; 2456 2457 idev = addrconf_add_dev(dev); 2458 if (IS_ERR(idev)) 2459 return PTR_ERR(idev); 2460 2461 scope = ipv6_addr_scope(pfx); 2462 2463 timeout = addrconf_timeout_fixup(valid_lft, HZ); 2464 if (addrconf_finite_timeout(timeout)) { 2465 expires = jiffies_to_clock_t(timeout * HZ); 2466 valid_lft = timeout; 2467 flags = RTF_EXPIRES; 2468 } else { 2469 expires = 0; 2470 flags = 0; 2471 ifa_flags |= IFA_F_PERMANENT; 2472 } 2473 2474 timeout = addrconf_timeout_fixup(prefered_lft, HZ); 2475 if (addrconf_finite_timeout(timeout)) { 2476 if (timeout == 0) 2477 ifa_flags |= IFA_F_DEPRECATED; 2478 prefered_lft = timeout; 2479 } 2480 2481 ifp = ipv6_add_addr(idev, pfx, peer_pfx, plen, scope, ifa_flags, 2482 valid_lft, prefered_lft); 2483 2484 if (!IS_ERR(ifp)) { 2485 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) { 2486 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev, 2487 expires, flags); 2488 } 2489 2490 /* 2491 * Note that section 3.1 of RFC 4429 indicates 2492 * that the Optimistic flag should not be set for 2493 * manually configured addresses 2494 */ 2495 addrconf_dad_start(ifp); 2496 if (ifa_flags & IFA_F_MANAGETEMPADDR) 2497 manage_tempaddrs(idev, ifp, valid_lft, prefered_lft, 2498 true, jiffies); 2499 in6_ifa_put(ifp); 2500 addrconf_verify_rtnl(); 2501 return 0; 2502 } 2503 2504 return PTR_ERR(ifp); 2505 } 2506 2507 static int inet6_addr_del(struct net *net, int ifindex, const struct in6_addr *pfx, 2508 unsigned int plen) 2509 { 2510 struct inet6_ifaddr *ifp; 2511 struct inet6_dev *idev; 2512 struct net_device *dev; 2513 2514 if (plen > 128) 2515 return -EINVAL; 2516 2517 dev = __dev_get_by_index(net, ifindex); 2518 if (!dev) 2519 return -ENODEV; 2520 2521 if ((idev = __in6_dev_get(dev)) == NULL) 2522 return -ENXIO; 2523 2524 read_lock_bh(&idev->lock); 2525 list_for_each_entry(ifp, &idev->addr_list, if_list) { 2526 if (ifp->prefix_len == plen && 2527 ipv6_addr_equal(pfx, &ifp->addr)) { 2528 in6_ifa_hold(ifp); 2529 read_unlock_bh(&idev->lock); 2530 2531 ipv6_del_addr(ifp); 2532 return 0; 2533 } 2534 } 2535 read_unlock_bh(&idev->lock); 2536 return -EADDRNOTAVAIL; 2537 } 2538 2539 2540 int addrconf_add_ifaddr(struct net *net, void __user *arg) 2541 { 2542 struct in6_ifreq ireq; 2543 int err; 2544 2545 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 2546 return -EPERM; 2547 2548 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2549 return -EFAULT; 2550 2551 rtnl_lock(); 2552 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, NULL, 2553 ireq.ifr6_prefixlen, IFA_F_PERMANENT, 2554 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME); 2555 rtnl_unlock(); 2556 return err; 2557 } 2558 2559 int addrconf_del_ifaddr(struct net *net, void __user *arg) 2560 { 2561 struct in6_ifreq ireq; 2562 int err; 2563 2564 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 2565 return -EPERM; 2566 2567 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2568 return -EFAULT; 2569 2570 rtnl_lock(); 2571 err = inet6_addr_del(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, 2572 ireq.ifr6_prefixlen); 2573 rtnl_unlock(); 2574 return err; 2575 } 2576 2577 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr, 2578 int plen, int scope) 2579 { 2580 struct inet6_ifaddr *ifp; 2581 2582 ifp = ipv6_add_addr(idev, addr, NULL, plen, 2583 scope, IFA_F_PERMANENT, 2584 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME); 2585 if (!IS_ERR(ifp)) { 2586 spin_lock_bh(&ifp->lock); 2587 ifp->flags &= ~IFA_F_TENTATIVE; 2588 spin_unlock_bh(&ifp->lock); 2589 ipv6_ifa_notify(RTM_NEWADDR, ifp); 2590 in6_ifa_put(ifp); 2591 } 2592 } 2593 2594 #if IS_ENABLED(CONFIG_IPV6_SIT) 2595 static void sit_add_v4_addrs(struct inet6_dev *idev) 2596 { 2597 struct in6_addr addr; 2598 struct net_device *dev; 2599 struct net *net = dev_net(idev->dev); 2600 int scope, plen; 2601 u32 pflags = 0; 2602 2603 ASSERT_RTNL(); 2604 2605 memset(&addr, 0, sizeof(struct in6_addr)); 2606 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4); 2607 2608 if (idev->dev->flags&IFF_POINTOPOINT) { 2609 addr.s6_addr32[0] = htonl(0xfe800000); 2610 scope = IFA_LINK; 2611 plen = 64; 2612 } else { 2613 scope = IPV6_ADDR_COMPATv4; 2614 plen = 96; 2615 pflags |= RTF_NONEXTHOP; 2616 } 2617 2618 if (addr.s6_addr32[3]) { 2619 add_addr(idev, &addr, plen, scope); 2620 addrconf_prefix_route(&addr, plen, idev->dev, 0, pflags); 2621 return; 2622 } 2623 2624 for_each_netdev(net, dev) { 2625 struct in_device *in_dev = __in_dev_get_rtnl(dev); 2626 if (in_dev && (dev->flags & IFF_UP)) { 2627 struct in_ifaddr *ifa; 2628 2629 int flag = scope; 2630 2631 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) { 2632 2633 addr.s6_addr32[3] = ifa->ifa_local; 2634 2635 if (ifa->ifa_scope == RT_SCOPE_LINK) 2636 continue; 2637 if (ifa->ifa_scope >= RT_SCOPE_HOST) { 2638 if (idev->dev->flags&IFF_POINTOPOINT) 2639 continue; 2640 flag |= IFA_HOST; 2641 } 2642 2643 add_addr(idev, &addr, plen, flag); 2644 addrconf_prefix_route(&addr, plen, idev->dev, 0, 2645 pflags); 2646 } 2647 } 2648 } 2649 } 2650 #endif 2651 2652 static void init_loopback(struct net_device *dev) 2653 { 2654 struct inet6_dev *idev; 2655 struct net_device *sp_dev; 2656 struct inet6_ifaddr *sp_ifa; 2657 struct rt6_info *sp_rt; 2658 2659 /* ::1 */ 2660 2661 ASSERT_RTNL(); 2662 2663 if ((idev = ipv6_find_idev(dev)) == NULL) { 2664 pr_debug("%s: add_dev failed\n", __func__); 2665 return; 2666 } 2667 2668 add_addr(idev, &in6addr_loopback, 128, IFA_HOST); 2669 2670 /* Add routes to other interface's IPv6 addresses */ 2671 for_each_netdev(dev_net(dev), sp_dev) { 2672 if (!strcmp(sp_dev->name, dev->name)) 2673 continue; 2674 2675 idev = __in6_dev_get(sp_dev); 2676 if (!idev) 2677 continue; 2678 2679 read_lock_bh(&idev->lock); 2680 list_for_each_entry(sp_ifa, &idev->addr_list, if_list) { 2681 2682 if (sp_ifa->flags & (IFA_F_DADFAILED | IFA_F_TENTATIVE)) 2683 continue; 2684 2685 if (sp_ifa->rt) { 2686 /* This dst has been added to garbage list when 2687 * lo device down, release this obsolete dst and 2688 * reallocate a new router for ifa. 2689 */ 2690 if (sp_ifa->rt->dst.obsolete > 0) { 2691 ip6_rt_put(sp_ifa->rt); 2692 sp_ifa->rt = NULL; 2693 } else { 2694 continue; 2695 } 2696 } 2697 2698 sp_rt = addrconf_dst_alloc(idev, &sp_ifa->addr, false); 2699 2700 /* Failure cases are ignored */ 2701 if (!IS_ERR(sp_rt)) { 2702 sp_ifa->rt = sp_rt; 2703 ip6_ins_rt(sp_rt); 2704 } 2705 } 2706 read_unlock_bh(&idev->lock); 2707 } 2708 } 2709 2710 static void addrconf_add_linklocal(struct inet6_dev *idev, const struct in6_addr *addr) 2711 { 2712 struct inet6_ifaddr *ifp; 2713 u32 addr_flags = IFA_F_PERMANENT; 2714 2715 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 2716 if (idev->cnf.optimistic_dad && 2717 !dev_net(idev->dev)->ipv6.devconf_all->forwarding) 2718 addr_flags |= IFA_F_OPTIMISTIC; 2719 #endif 2720 2721 2722 ifp = ipv6_add_addr(idev, addr, NULL, 64, IFA_LINK, addr_flags, 2723 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME); 2724 if (!IS_ERR(ifp)) { 2725 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0); 2726 addrconf_dad_start(ifp); 2727 in6_ifa_put(ifp); 2728 } 2729 } 2730 2731 static void addrconf_dev_config(struct net_device *dev) 2732 { 2733 struct in6_addr addr; 2734 struct inet6_dev *idev; 2735 2736 ASSERT_RTNL(); 2737 2738 if ((dev->type != ARPHRD_ETHER) && 2739 (dev->type != ARPHRD_FDDI) && 2740 (dev->type != ARPHRD_ARCNET) && 2741 (dev->type != ARPHRD_INFINIBAND) && 2742 (dev->type != ARPHRD_IEEE802154) && 2743 (dev->type != ARPHRD_IEEE1394) && 2744 (dev->type != ARPHRD_TUNNEL6) && 2745 (dev->type != ARPHRD_6LOWPAN)) { 2746 /* Alas, we support only Ethernet autoconfiguration. */ 2747 return; 2748 } 2749 2750 idev = addrconf_add_dev(dev); 2751 if (IS_ERR(idev)) 2752 return; 2753 2754 memset(&addr, 0, sizeof(struct in6_addr)); 2755 addr.s6_addr32[0] = htonl(0xFE800000); 2756 2757 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0) 2758 addrconf_add_linklocal(idev, &addr); 2759 } 2760 2761 #if IS_ENABLED(CONFIG_IPV6_SIT) 2762 static void addrconf_sit_config(struct net_device *dev) 2763 { 2764 struct inet6_dev *idev; 2765 2766 ASSERT_RTNL(); 2767 2768 /* 2769 * Configure the tunnel with one of our IPv4 2770 * addresses... we should configure all of 2771 * our v4 addrs in the tunnel 2772 */ 2773 2774 if ((idev = ipv6_find_idev(dev)) == NULL) { 2775 pr_debug("%s: add_dev failed\n", __func__); 2776 return; 2777 } 2778 2779 if (dev->priv_flags & IFF_ISATAP) { 2780 struct in6_addr addr; 2781 2782 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0); 2783 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev)) 2784 addrconf_add_linklocal(idev, &addr); 2785 return; 2786 } 2787 2788 sit_add_v4_addrs(idev); 2789 2790 if (dev->flags&IFF_POINTOPOINT) 2791 addrconf_add_mroute(dev); 2792 } 2793 #endif 2794 2795 #if IS_ENABLED(CONFIG_NET_IPGRE) 2796 static void addrconf_gre_config(struct net_device *dev) 2797 { 2798 struct inet6_dev *idev; 2799 struct in6_addr addr; 2800 2801 ASSERT_RTNL(); 2802 2803 if ((idev = ipv6_find_idev(dev)) == NULL) { 2804 pr_debug("%s: add_dev failed\n", __func__); 2805 return; 2806 } 2807 2808 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0); 2809 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev)) 2810 addrconf_add_linklocal(idev, &addr); 2811 else 2812 addrconf_prefix_route(&addr, 64, dev, 0, 0); 2813 } 2814 #endif 2815 2816 static inline int 2817 ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev) 2818 { 2819 struct in6_addr lladdr; 2820 2821 if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) { 2822 addrconf_add_linklocal(idev, &lladdr); 2823 return 0; 2824 } 2825 return -1; 2826 } 2827 2828 static int addrconf_notify(struct notifier_block *this, unsigned long event, 2829 void *ptr) 2830 { 2831 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 2832 struct inet6_dev *idev = __in6_dev_get(dev); 2833 int run_pending = 0; 2834 int err; 2835 2836 switch (event) { 2837 case NETDEV_REGISTER: 2838 if (!idev && dev->mtu >= IPV6_MIN_MTU) { 2839 idev = ipv6_add_dev(dev); 2840 if (!idev) 2841 return notifier_from_errno(-ENOMEM); 2842 } 2843 break; 2844 2845 case NETDEV_UP: 2846 case NETDEV_CHANGE: 2847 if (dev->flags & IFF_SLAVE) 2848 break; 2849 2850 if (event == NETDEV_UP) { 2851 if (!addrconf_qdisc_ok(dev)) { 2852 /* device is not ready yet. */ 2853 pr_info("ADDRCONF(NETDEV_UP): %s: link is not ready\n", 2854 dev->name); 2855 break; 2856 } 2857 2858 if (!idev && dev->mtu >= IPV6_MIN_MTU) 2859 idev = ipv6_add_dev(dev); 2860 2861 if (idev) { 2862 idev->if_flags |= IF_READY; 2863 run_pending = 1; 2864 } 2865 } else { 2866 if (!addrconf_qdisc_ok(dev)) { 2867 /* device is still not ready. */ 2868 break; 2869 } 2870 2871 if (idev) { 2872 if (idev->if_flags & IF_READY) 2873 /* device is already configured. */ 2874 break; 2875 idev->if_flags |= IF_READY; 2876 } 2877 2878 pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n", 2879 dev->name); 2880 2881 run_pending = 1; 2882 } 2883 2884 switch (dev->type) { 2885 #if IS_ENABLED(CONFIG_IPV6_SIT) 2886 case ARPHRD_SIT: 2887 addrconf_sit_config(dev); 2888 break; 2889 #endif 2890 #if IS_ENABLED(CONFIG_NET_IPGRE) 2891 case ARPHRD_IPGRE: 2892 addrconf_gre_config(dev); 2893 break; 2894 #endif 2895 case ARPHRD_LOOPBACK: 2896 init_loopback(dev); 2897 break; 2898 2899 default: 2900 addrconf_dev_config(dev); 2901 break; 2902 } 2903 2904 if (idev) { 2905 if (run_pending) 2906 addrconf_dad_run(idev); 2907 2908 /* 2909 * If the MTU changed during the interface down, 2910 * when the interface up, the changed MTU must be 2911 * reflected in the idev as well as routers. 2912 */ 2913 if (idev->cnf.mtu6 != dev->mtu && 2914 dev->mtu >= IPV6_MIN_MTU) { 2915 rt6_mtu_change(dev, dev->mtu); 2916 idev->cnf.mtu6 = dev->mtu; 2917 } 2918 idev->tstamp = jiffies; 2919 inet6_ifinfo_notify(RTM_NEWLINK, idev); 2920 2921 /* 2922 * If the changed mtu during down is lower than 2923 * IPV6_MIN_MTU stop IPv6 on this interface. 2924 */ 2925 if (dev->mtu < IPV6_MIN_MTU) 2926 addrconf_ifdown(dev, 1); 2927 } 2928 break; 2929 2930 case NETDEV_CHANGEMTU: 2931 if (idev && dev->mtu >= IPV6_MIN_MTU) { 2932 rt6_mtu_change(dev, dev->mtu); 2933 idev->cnf.mtu6 = dev->mtu; 2934 break; 2935 } 2936 2937 if (!idev && dev->mtu >= IPV6_MIN_MTU) { 2938 idev = ipv6_add_dev(dev); 2939 if (idev) 2940 break; 2941 } 2942 2943 /* 2944 * if MTU under IPV6_MIN_MTU. 2945 * Stop IPv6 on this interface. 2946 */ 2947 2948 case NETDEV_DOWN: 2949 case NETDEV_UNREGISTER: 2950 /* 2951 * Remove all addresses from this interface. 2952 */ 2953 addrconf_ifdown(dev, event != NETDEV_DOWN); 2954 break; 2955 2956 case NETDEV_CHANGENAME: 2957 if (idev) { 2958 snmp6_unregister_dev(idev); 2959 addrconf_sysctl_unregister(idev); 2960 addrconf_sysctl_register(idev); 2961 err = snmp6_register_dev(idev); 2962 if (err) 2963 return notifier_from_errno(err); 2964 } 2965 break; 2966 2967 case NETDEV_PRE_TYPE_CHANGE: 2968 case NETDEV_POST_TYPE_CHANGE: 2969 addrconf_type_change(dev, event); 2970 break; 2971 } 2972 2973 return NOTIFY_OK; 2974 } 2975 2976 /* 2977 * addrconf module should be notified of a device going up 2978 */ 2979 static struct notifier_block ipv6_dev_notf = { 2980 .notifier_call = addrconf_notify, 2981 }; 2982 2983 static void addrconf_type_change(struct net_device *dev, unsigned long event) 2984 { 2985 struct inet6_dev *idev; 2986 ASSERT_RTNL(); 2987 2988 idev = __in6_dev_get(dev); 2989 2990 if (event == NETDEV_POST_TYPE_CHANGE) 2991 ipv6_mc_remap(idev); 2992 else if (event == NETDEV_PRE_TYPE_CHANGE) 2993 ipv6_mc_unmap(idev); 2994 } 2995 2996 static int addrconf_ifdown(struct net_device *dev, int how) 2997 { 2998 struct net *net = dev_net(dev); 2999 struct inet6_dev *idev; 3000 struct inet6_ifaddr *ifa; 3001 int state, i; 3002 3003 ASSERT_RTNL(); 3004 3005 rt6_ifdown(net, dev); 3006 neigh_ifdown(&nd_tbl, dev); 3007 3008 idev = __in6_dev_get(dev); 3009 if (idev == NULL) 3010 return -ENODEV; 3011 3012 /* 3013 * Step 1: remove reference to ipv6 device from parent device. 3014 * Do not dev_put! 3015 */ 3016 if (how) { 3017 idev->dead = 1; 3018 3019 /* protected by rtnl_lock */ 3020 RCU_INIT_POINTER(dev->ip6_ptr, NULL); 3021 3022 /* Step 1.5: remove snmp6 entry */ 3023 snmp6_unregister_dev(idev); 3024 3025 } 3026 3027 /* Step 2: clear hash table */ 3028 for (i = 0; i < IN6_ADDR_HSIZE; i++) { 3029 struct hlist_head *h = &inet6_addr_lst[i]; 3030 3031 spin_lock_bh(&addrconf_hash_lock); 3032 restart: 3033 hlist_for_each_entry_rcu(ifa, h, addr_lst) { 3034 if (ifa->idev == idev) { 3035 hlist_del_init_rcu(&ifa->addr_lst); 3036 addrconf_del_dad_work(ifa); 3037 goto restart; 3038 } 3039 } 3040 spin_unlock_bh(&addrconf_hash_lock); 3041 } 3042 3043 write_lock_bh(&idev->lock); 3044 3045 addrconf_del_rs_timer(idev); 3046 3047 /* Step 2: clear flags for stateless addrconf */ 3048 if (!how) 3049 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY); 3050 3051 if (how && del_timer(&idev->regen_timer)) 3052 in6_dev_put(idev); 3053 3054 /* Step 3: clear tempaddr list */ 3055 while (!list_empty(&idev->tempaddr_list)) { 3056 ifa = list_first_entry(&idev->tempaddr_list, 3057 struct inet6_ifaddr, tmp_list); 3058 list_del(&ifa->tmp_list); 3059 write_unlock_bh(&idev->lock); 3060 spin_lock_bh(&ifa->lock); 3061 3062 if (ifa->ifpub) { 3063 in6_ifa_put(ifa->ifpub); 3064 ifa->ifpub = NULL; 3065 } 3066 spin_unlock_bh(&ifa->lock); 3067 in6_ifa_put(ifa); 3068 write_lock_bh(&idev->lock); 3069 } 3070 3071 while (!list_empty(&idev->addr_list)) { 3072 ifa = list_first_entry(&idev->addr_list, 3073 struct inet6_ifaddr, if_list); 3074 addrconf_del_dad_work(ifa); 3075 3076 list_del(&ifa->if_list); 3077 3078 write_unlock_bh(&idev->lock); 3079 3080 spin_lock_bh(&ifa->state_lock); 3081 state = ifa->state; 3082 ifa->state = INET6_IFADDR_STATE_DEAD; 3083 spin_unlock_bh(&ifa->state_lock); 3084 3085 if (state != INET6_IFADDR_STATE_DEAD) { 3086 __ipv6_ifa_notify(RTM_DELADDR, ifa); 3087 inet6addr_notifier_call_chain(NETDEV_DOWN, ifa); 3088 } 3089 in6_ifa_put(ifa); 3090 3091 write_lock_bh(&idev->lock); 3092 } 3093 3094 write_unlock_bh(&idev->lock); 3095 3096 /* Step 5: Discard multicast list */ 3097 if (how) 3098 ipv6_mc_destroy_dev(idev); 3099 else 3100 ipv6_mc_down(idev); 3101 3102 idev->tstamp = jiffies; 3103 3104 /* Last: Shot the device (if unregistered) */ 3105 if (how) { 3106 addrconf_sysctl_unregister(idev); 3107 neigh_parms_release(&nd_tbl, idev->nd_parms); 3108 neigh_ifdown(&nd_tbl, dev); 3109 in6_dev_put(idev); 3110 } 3111 return 0; 3112 } 3113 3114 static void addrconf_rs_timer(unsigned long data) 3115 { 3116 struct inet6_dev *idev = (struct inet6_dev *)data; 3117 struct net_device *dev = idev->dev; 3118 struct in6_addr lladdr; 3119 3120 write_lock(&idev->lock); 3121 if (idev->dead || !(idev->if_flags & IF_READY)) 3122 goto out; 3123 3124 if (!ipv6_accept_ra(idev)) 3125 goto out; 3126 3127 /* Announcement received after solicitation was sent */ 3128 if (idev->if_flags & IF_RA_RCVD) 3129 goto out; 3130 3131 if (idev->rs_probes++ < idev->cnf.rtr_solicits) { 3132 write_unlock(&idev->lock); 3133 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE)) 3134 ndisc_send_rs(dev, &lladdr, 3135 &in6addr_linklocal_allrouters); 3136 else 3137 goto put; 3138 3139 write_lock(&idev->lock); 3140 /* The wait after the last probe can be shorter */ 3141 addrconf_mod_rs_timer(idev, (idev->rs_probes == 3142 idev->cnf.rtr_solicits) ? 3143 idev->cnf.rtr_solicit_delay : 3144 idev->cnf.rtr_solicit_interval); 3145 } else { 3146 /* 3147 * Note: we do not support deprecated "all on-link" 3148 * assumption any longer. 3149 */ 3150 pr_debug("%s: no IPv6 routers present\n", idev->dev->name); 3151 } 3152 3153 out: 3154 write_unlock(&idev->lock); 3155 put: 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 = prandom_u32() % (idev->cnf.rtr_solicit_delay ? : 1); 3171 3172 ifp->dad_probes = idev->cnf.dad_transmits; 3173 addrconf_mod_dad_work(ifp, rand_num); 3174 } 3175 3176 static void addrconf_dad_begin(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 prandom_seed((__force u32) 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_start(struct inet6_ifaddr *ifp) 3229 { 3230 bool begin_dad = false; 3231 3232 spin_lock_bh(&ifp->state_lock); 3233 if (ifp->state != INET6_IFADDR_STATE_DEAD) { 3234 ifp->state = INET6_IFADDR_STATE_PREDAD; 3235 begin_dad = true; 3236 } 3237 spin_unlock_bh(&ifp->state_lock); 3238 3239 if (begin_dad) 3240 addrconf_mod_dad_work(ifp, 0); 3241 } 3242 3243 static void addrconf_dad_work(struct work_struct *w) 3244 { 3245 struct inet6_ifaddr *ifp = container_of(to_delayed_work(w), 3246 struct inet6_ifaddr, 3247 dad_work); 3248 struct inet6_dev *idev = ifp->idev; 3249 struct in6_addr mcaddr; 3250 3251 enum { 3252 DAD_PROCESS, 3253 DAD_BEGIN, 3254 DAD_ABORT, 3255 } action = DAD_PROCESS; 3256 3257 rtnl_lock(); 3258 3259 spin_lock_bh(&ifp->state_lock); 3260 if (ifp->state == INET6_IFADDR_STATE_PREDAD) { 3261 action = DAD_BEGIN; 3262 ifp->state = INET6_IFADDR_STATE_DAD; 3263 } else if (ifp->state == INET6_IFADDR_STATE_ERRDAD) { 3264 action = DAD_ABORT; 3265 ifp->state = INET6_IFADDR_STATE_POSTDAD; 3266 } 3267 spin_unlock_bh(&ifp->state_lock); 3268 3269 if (action == DAD_BEGIN) { 3270 addrconf_dad_begin(ifp); 3271 goto out; 3272 } else if (action == DAD_ABORT) { 3273 addrconf_dad_stop(ifp, 1); 3274 goto out; 3275 } 3276 3277 if (!ifp->dad_probes && addrconf_dad_end(ifp)) 3278 goto out; 3279 3280 write_lock_bh(&idev->lock); 3281 if (idev->dead || !(idev->if_flags & IF_READY)) { 3282 write_unlock_bh(&idev->lock); 3283 goto out; 3284 } 3285 3286 spin_lock(&ifp->lock); 3287 if (ifp->state == INET6_IFADDR_STATE_DEAD) { 3288 spin_unlock(&ifp->lock); 3289 write_unlock_bh(&idev->lock); 3290 goto out; 3291 } 3292 3293 if (ifp->dad_probes == 0) { 3294 /* 3295 * DAD was successful 3296 */ 3297 3298 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED); 3299 spin_unlock(&ifp->lock); 3300 write_unlock_bh(&idev->lock); 3301 3302 addrconf_dad_completed(ifp); 3303 3304 goto out; 3305 } 3306 3307 ifp->dad_probes--; 3308 addrconf_mod_dad_work(ifp, 3309 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME)); 3310 spin_unlock(&ifp->lock); 3311 write_unlock_bh(&idev->lock); 3312 3313 /* send a neighbour solicitation for our addr */ 3314 addrconf_addr_solict_mult(&ifp->addr, &mcaddr); 3315 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &in6addr_any); 3316 out: 3317 in6_ifa_put(ifp); 3318 rtnl_unlock(); 3319 } 3320 3321 /* ifp->idev must be at least read locked */ 3322 static bool ipv6_lonely_lladdr(struct inet6_ifaddr *ifp) 3323 { 3324 struct inet6_ifaddr *ifpiter; 3325 struct inet6_dev *idev = ifp->idev; 3326 3327 list_for_each_entry_reverse(ifpiter, &idev->addr_list, if_list) { 3328 if (ifpiter->scope > IFA_LINK) 3329 break; 3330 if (ifp != ifpiter && ifpiter->scope == IFA_LINK && 3331 (ifpiter->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE| 3332 IFA_F_OPTIMISTIC|IFA_F_DADFAILED)) == 3333 IFA_F_PERMANENT) 3334 return false; 3335 } 3336 return true; 3337 } 3338 3339 static void addrconf_dad_completed(struct inet6_ifaddr *ifp) 3340 { 3341 struct net_device *dev = ifp->idev->dev; 3342 struct in6_addr lladdr; 3343 bool send_rs, send_mld; 3344 3345 addrconf_del_dad_work(ifp); 3346 3347 /* 3348 * Configure the address for reception. Now it is valid. 3349 */ 3350 3351 ipv6_ifa_notify(RTM_NEWADDR, ifp); 3352 3353 /* If added prefix is link local and we are prepared to process 3354 router advertisements, start sending router solicitations. 3355 */ 3356 3357 read_lock_bh(&ifp->idev->lock); 3358 send_mld = ifp->scope == IFA_LINK && ipv6_lonely_lladdr(ifp); 3359 send_rs = send_mld && 3360 ipv6_accept_ra(ifp->idev) && 3361 ifp->idev->cnf.rtr_solicits > 0 && 3362 (dev->flags&IFF_LOOPBACK) == 0; 3363 read_unlock_bh(&ifp->idev->lock); 3364 3365 /* While dad is in progress mld report's source address is in6_addrany. 3366 * Resend with proper ll now. 3367 */ 3368 if (send_mld) 3369 ipv6_mc_dad_complete(ifp->idev); 3370 3371 if (send_rs) { 3372 /* 3373 * If a host as already performed a random delay 3374 * [...] as part of DAD [...] there is no need 3375 * to delay again before sending the first RS 3376 */ 3377 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE)) 3378 return; 3379 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters); 3380 3381 write_lock_bh(&ifp->idev->lock); 3382 spin_lock(&ifp->lock); 3383 ifp->idev->rs_probes = 1; 3384 ifp->idev->if_flags |= IF_RS_SENT; 3385 addrconf_mod_rs_timer(ifp->idev, 3386 ifp->idev->cnf.rtr_solicit_interval); 3387 spin_unlock(&ifp->lock); 3388 write_unlock_bh(&ifp->idev->lock); 3389 } 3390 } 3391 3392 static void addrconf_dad_run(struct inet6_dev *idev) 3393 { 3394 struct inet6_ifaddr *ifp; 3395 3396 read_lock_bh(&idev->lock); 3397 list_for_each_entry(ifp, &idev->addr_list, if_list) { 3398 spin_lock(&ifp->lock); 3399 if (ifp->flags & IFA_F_TENTATIVE && 3400 ifp->state == INET6_IFADDR_STATE_DAD) 3401 addrconf_dad_kick(ifp); 3402 spin_unlock(&ifp->lock); 3403 } 3404 read_unlock_bh(&idev->lock); 3405 } 3406 3407 #ifdef CONFIG_PROC_FS 3408 struct if6_iter_state { 3409 struct seq_net_private p; 3410 int bucket; 3411 int offset; 3412 }; 3413 3414 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos) 3415 { 3416 struct inet6_ifaddr *ifa = NULL; 3417 struct if6_iter_state *state = seq->private; 3418 struct net *net = seq_file_net(seq); 3419 int p = 0; 3420 3421 /* initial bucket if pos is 0 */ 3422 if (pos == 0) { 3423 state->bucket = 0; 3424 state->offset = 0; 3425 } 3426 3427 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) { 3428 hlist_for_each_entry_rcu_bh(ifa, &inet6_addr_lst[state->bucket], 3429 addr_lst) { 3430 if (!net_eq(dev_net(ifa->idev->dev), net)) 3431 continue; 3432 /* sync with offset */ 3433 if (p < state->offset) { 3434 p++; 3435 continue; 3436 } 3437 state->offset++; 3438 return ifa; 3439 } 3440 3441 /* prepare for next bucket */ 3442 state->offset = 0; 3443 p = 0; 3444 } 3445 return NULL; 3446 } 3447 3448 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, 3449 struct inet6_ifaddr *ifa) 3450 { 3451 struct if6_iter_state *state = seq->private; 3452 struct net *net = seq_file_net(seq); 3453 3454 hlist_for_each_entry_continue_rcu_bh(ifa, addr_lst) { 3455 if (!net_eq(dev_net(ifa->idev->dev), net)) 3456 continue; 3457 state->offset++; 3458 return ifa; 3459 } 3460 3461 while (++state->bucket < IN6_ADDR_HSIZE) { 3462 state->offset = 0; 3463 hlist_for_each_entry_rcu_bh(ifa, 3464 &inet6_addr_lst[state->bucket], addr_lst) { 3465 if (!net_eq(dev_net(ifa->idev->dev), net)) 3466 continue; 3467 state->offset++; 3468 return ifa; 3469 } 3470 } 3471 3472 return NULL; 3473 } 3474 3475 static void *if6_seq_start(struct seq_file *seq, loff_t *pos) 3476 __acquires(rcu_bh) 3477 { 3478 rcu_read_lock_bh(); 3479 return if6_get_first(seq, *pos); 3480 } 3481 3482 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos) 3483 { 3484 struct inet6_ifaddr *ifa; 3485 3486 ifa = if6_get_next(seq, v); 3487 ++*pos; 3488 return ifa; 3489 } 3490 3491 static void if6_seq_stop(struct seq_file *seq, void *v) 3492 __releases(rcu_bh) 3493 { 3494 rcu_read_unlock_bh(); 3495 } 3496 3497 static int if6_seq_show(struct seq_file *seq, void *v) 3498 { 3499 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v; 3500 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n", 3501 &ifp->addr, 3502 ifp->idev->dev->ifindex, 3503 ifp->prefix_len, 3504 ifp->scope, 3505 (u8) ifp->flags, 3506 ifp->idev->dev->name); 3507 return 0; 3508 } 3509 3510 static const struct seq_operations if6_seq_ops = { 3511 .start = if6_seq_start, 3512 .next = if6_seq_next, 3513 .show = if6_seq_show, 3514 .stop = if6_seq_stop, 3515 }; 3516 3517 static int if6_seq_open(struct inode *inode, struct file *file) 3518 { 3519 return seq_open_net(inode, file, &if6_seq_ops, 3520 sizeof(struct if6_iter_state)); 3521 } 3522 3523 static const struct file_operations if6_fops = { 3524 .owner = THIS_MODULE, 3525 .open = if6_seq_open, 3526 .read = seq_read, 3527 .llseek = seq_lseek, 3528 .release = seq_release_net, 3529 }; 3530 3531 static int __net_init if6_proc_net_init(struct net *net) 3532 { 3533 if (!proc_create("if_inet6", S_IRUGO, net->proc_net, &if6_fops)) 3534 return -ENOMEM; 3535 return 0; 3536 } 3537 3538 static void __net_exit if6_proc_net_exit(struct net *net) 3539 { 3540 remove_proc_entry("if_inet6", net->proc_net); 3541 } 3542 3543 static struct pernet_operations if6_proc_net_ops = { 3544 .init = if6_proc_net_init, 3545 .exit = if6_proc_net_exit, 3546 }; 3547 3548 int __init if6_proc_init(void) 3549 { 3550 return register_pernet_subsys(&if6_proc_net_ops); 3551 } 3552 3553 void if6_proc_exit(void) 3554 { 3555 unregister_pernet_subsys(&if6_proc_net_ops); 3556 } 3557 #endif /* CONFIG_PROC_FS */ 3558 3559 #if IS_ENABLED(CONFIG_IPV6_MIP6) 3560 /* Check if address is a home address configured on any interface. */ 3561 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr) 3562 { 3563 int ret = 0; 3564 struct inet6_ifaddr *ifp = NULL; 3565 unsigned int hash = inet6_addr_hash(addr); 3566 3567 rcu_read_lock_bh(); 3568 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) { 3569 if (!net_eq(dev_net(ifp->idev->dev), net)) 3570 continue; 3571 if (ipv6_addr_equal(&ifp->addr, addr) && 3572 (ifp->flags & IFA_F_HOMEADDRESS)) { 3573 ret = 1; 3574 break; 3575 } 3576 } 3577 rcu_read_unlock_bh(); 3578 return ret; 3579 } 3580 #endif 3581 3582 /* 3583 * Periodic address status verification 3584 */ 3585 3586 static void addrconf_verify_rtnl(void) 3587 { 3588 unsigned long now, next, next_sec, next_sched; 3589 struct inet6_ifaddr *ifp; 3590 int i; 3591 3592 ASSERT_RTNL(); 3593 3594 rcu_read_lock_bh(); 3595 now = jiffies; 3596 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY); 3597 3598 cancel_delayed_work(&addr_chk_work); 3599 3600 for (i = 0; i < IN6_ADDR_HSIZE; i++) { 3601 restart: 3602 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[i], addr_lst) { 3603 unsigned long age; 3604 3605 /* When setting preferred_lft to a value not zero or 3606 * infinity, while valid_lft is infinity 3607 * IFA_F_PERMANENT has a non-infinity life time. 3608 */ 3609 if ((ifp->flags & IFA_F_PERMANENT) && 3610 (ifp->prefered_lft == INFINITY_LIFE_TIME)) 3611 continue; 3612 3613 spin_lock(&ifp->lock); 3614 /* We try to batch several events at once. */ 3615 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ; 3616 3617 if (ifp->valid_lft != INFINITY_LIFE_TIME && 3618 age >= ifp->valid_lft) { 3619 spin_unlock(&ifp->lock); 3620 in6_ifa_hold(ifp); 3621 ipv6_del_addr(ifp); 3622 goto restart; 3623 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) { 3624 spin_unlock(&ifp->lock); 3625 continue; 3626 } else if (age >= ifp->prefered_lft) { 3627 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */ 3628 int deprecate = 0; 3629 3630 if (!(ifp->flags&IFA_F_DEPRECATED)) { 3631 deprecate = 1; 3632 ifp->flags |= IFA_F_DEPRECATED; 3633 } 3634 3635 if ((ifp->valid_lft != INFINITY_LIFE_TIME) && 3636 (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))) 3637 next = ifp->tstamp + ifp->valid_lft * HZ; 3638 3639 spin_unlock(&ifp->lock); 3640 3641 if (deprecate) { 3642 in6_ifa_hold(ifp); 3643 3644 ipv6_ifa_notify(0, ifp); 3645 in6_ifa_put(ifp); 3646 goto restart; 3647 } 3648 } else if ((ifp->flags&IFA_F_TEMPORARY) && 3649 !(ifp->flags&IFA_F_TENTATIVE)) { 3650 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry * 3651 ifp->idev->cnf.dad_transmits * 3652 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME) / HZ; 3653 3654 if (age >= ifp->prefered_lft - regen_advance) { 3655 struct inet6_ifaddr *ifpub = ifp->ifpub; 3656 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 3657 next = ifp->tstamp + ifp->prefered_lft * HZ; 3658 if (!ifp->regen_count && ifpub) { 3659 ifp->regen_count++; 3660 in6_ifa_hold(ifp); 3661 in6_ifa_hold(ifpub); 3662 spin_unlock(&ifp->lock); 3663 3664 spin_lock(&ifpub->lock); 3665 ifpub->regen_count = 0; 3666 spin_unlock(&ifpub->lock); 3667 ipv6_create_tempaddr(ifpub, ifp); 3668 in6_ifa_put(ifpub); 3669 in6_ifa_put(ifp); 3670 goto restart; 3671 } 3672 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next)) 3673 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ; 3674 spin_unlock(&ifp->lock); 3675 } else { 3676 /* ifp->prefered_lft <= ifp->valid_lft */ 3677 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 3678 next = ifp->tstamp + ifp->prefered_lft * HZ; 3679 spin_unlock(&ifp->lock); 3680 } 3681 } 3682 } 3683 3684 next_sec = round_jiffies_up(next); 3685 next_sched = next; 3686 3687 /* If rounded timeout is accurate enough, accept it. */ 3688 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ)) 3689 next_sched = next_sec; 3690 3691 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */ 3692 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX)) 3693 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX; 3694 3695 ADBG(KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n", 3696 now, next, next_sec, next_sched); 3697 mod_delayed_work(addrconf_wq, &addr_chk_work, next_sched - now); 3698 rcu_read_unlock_bh(); 3699 } 3700 3701 static void addrconf_verify_work(struct work_struct *w) 3702 { 3703 rtnl_lock(); 3704 addrconf_verify_rtnl(); 3705 rtnl_unlock(); 3706 } 3707 3708 static void addrconf_verify(void) 3709 { 3710 mod_delayed_work(addrconf_wq, &addr_chk_work, 0); 3711 } 3712 3713 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local, 3714 struct in6_addr **peer_pfx) 3715 { 3716 struct in6_addr *pfx = NULL; 3717 3718 *peer_pfx = NULL; 3719 3720 if (addr) 3721 pfx = nla_data(addr); 3722 3723 if (local) { 3724 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx))) 3725 *peer_pfx = pfx; 3726 pfx = nla_data(local); 3727 } 3728 3729 return pfx; 3730 } 3731 3732 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = { 3733 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) }, 3734 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) }, 3735 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) }, 3736 [IFA_FLAGS] = { .len = sizeof(u32) }, 3737 }; 3738 3739 static int 3740 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh) 3741 { 3742 struct net *net = sock_net(skb->sk); 3743 struct ifaddrmsg *ifm; 3744 struct nlattr *tb[IFA_MAX+1]; 3745 struct in6_addr *pfx, *peer_pfx; 3746 int err; 3747 3748 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy); 3749 if (err < 0) 3750 return err; 3751 3752 ifm = nlmsg_data(nlh); 3753 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx); 3754 if (pfx == NULL) 3755 return -EINVAL; 3756 3757 return inet6_addr_del(net, ifm->ifa_index, pfx, ifm->ifa_prefixlen); 3758 } 3759 3760 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u32 ifa_flags, 3761 u32 prefered_lft, u32 valid_lft) 3762 { 3763 u32 flags; 3764 clock_t expires; 3765 unsigned long timeout; 3766 bool was_managetempaddr; 3767 bool had_prefixroute; 3768 3769 ASSERT_RTNL(); 3770 3771 if (!valid_lft || (prefered_lft > valid_lft)) 3772 return -EINVAL; 3773 3774 if (ifa_flags & IFA_F_MANAGETEMPADDR && 3775 (ifp->flags & IFA_F_TEMPORARY || ifp->prefix_len != 64)) 3776 return -EINVAL; 3777 3778 timeout = addrconf_timeout_fixup(valid_lft, HZ); 3779 if (addrconf_finite_timeout(timeout)) { 3780 expires = jiffies_to_clock_t(timeout * HZ); 3781 valid_lft = timeout; 3782 flags = RTF_EXPIRES; 3783 } else { 3784 expires = 0; 3785 flags = 0; 3786 ifa_flags |= IFA_F_PERMANENT; 3787 } 3788 3789 timeout = addrconf_timeout_fixup(prefered_lft, HZ); 3790 if (addrconf_finite_timeout(timeout)) { 3791 if (timeout == 0) 3792 ifa_flags |= IFA_F_DEPRECATED; 3793 prefered_lft = timeout; 3794 } 3795 3796 spin_lock_bh(&ifp->lock); 3797 was_managetempaddr = ifp->flags & IFA_F_MANAGETEMPADDR; 3798 had_prefixroute = ifp->flags & IFA_F_PERMANENT && 3799 !(ifp->flags & IFA_F_NOPREFIXROUTE); 3800 ifp->flags &= ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | 3801 IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR | 3802 IFA_F_NOPREFIXROUTE); 3803 ifp->flags |= ifa_flags; 3804 ifp->tstamp = jiffies; 3805 ifp->valid_lft = valid_lft; 3806 ifp->prefered_lft = prefered_lft; 3807 3808 spin_unlock_bh(&ifp->lock); 3809 if (!(ifp->flags&IFA_F_TENTATIVE)) 3810 ipv6_ifa_notify(0, ifp); 3811 3812 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) { 3813 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev, 3814 expires, flags); 3815 } else if (had_prefixroute) { 3816 enum cleanup_prefix_rt_t action; 3817 unsigned long rt_expires; 3818 3819 write_lock_bh(&ifp->idev->lock); 3820 action = check_cleanup_prefix_route(ifp, &rt_expires); 3821 write_unlock_bh(&ifp->idev->lock); 3822 3823 if (action != CLEANUP_PREFIX_RT_NOP) { 3824 cleanup_prefix_route(ifp, rt_expires, 3825 action == CLEANUP_PREFIX_RT_DEL); 3826 } 3827 } 3828 3829 if (was_managetempaddr || ifp->flags & IFA_F_MANAGETEMPADDR) { 3830 if (was_managetempaddr && !(ifp->flags & IFA_F_MANAGETEMPADDR)) 3831 valid_lft = prefered_lft = 0; 3832 manage_tempaddrs(ifp->idev, ifp, valid_lft, prefered_lft, 3833 !was_managetempaddr, jiffies); 3834 } 3835 3836 addrconf_verify_rtnl(); 3837 3838 return 0; 3839 } 3840 3841 static int 3842 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh) 3843 { 3844 struct net *net = sock_net(skb->sk); 3845 struct ifaddrmsg *ifm; 3846 struct nlattr *tb[IFA_MAX+1]; 3847 struct in6_addr *pfx, *peer_pfx; 3848 struct inet6_ifaddr *ifa; 3849 struct net_device *dev; 3850 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME; 3851 u32 ifa_flags; 3852 int err; 3853 3854 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy); 3855 if (err < 0) 3856 return err; 3857 3858 ifm = nlmsg_data(nlh); 3859 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx); 3860 if (pfx == NULL) 3861 return -EINVAL; 3862 3863 if (tb[IFA_CACHEINFO]) { 3864 struct ifa_cacheinfo *ci; 3865 3866 ci = nla_data(tb[IFA_CACHEINFO]); 3867 valid_lft = ci->ifa_valid; 3868 preferred_lft = ci->ifa_prefered; 3869 } else { 3870 preferred_lft = INFINITY_LIFE_TIME; 3871 valid_lft = INFINITY_LIFE_TIME; 3872 } 3873 3874 dev = __dev_get_by_index(net, ifm->ifa_index); 3875 if (dev == NULL) 3876 return -ENODEV; 3877 3878 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags; 3879 3880 /* We ignore other flags so far. */ 3881 ifa_flags &= IFA_F_NODAD | IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR | 3882 IFA_F_NOPREFIXROUTE; 3883 3884 ifa = ipv6_get_ifaddr(net, pfx, dev, 1); 3885 if (ifa == NULL) { 3886 /* 3887 * It would be best to check for !NLM_F_CREATE here but 3888 * userspace already relies on not having to provide this. 3889 */ 3890 return inet6_addr_add(net, ifm->ifa_index, pfx, peer_pfx, 3891 ifm->ifa_prefixlen, ifa_flags, 3892 preferred_lft, valid_lft); 3893 } 3894 3895 if (nlh->nlmsg_flags & NLM_F_EXCL || 3896 !(nlh->nlmsg_flags & NLM_F_REPLACE)) 3897 err = -EEXIST; 3898 else 3899 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft); 3900 3901 in6_ifa_put(ifa); 3902 3903 return err; 3904 } 3905 3906 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u32 flags, 3907 u8 scope, int ifindex) 3908 { 3909 struct ifaddrmsg *ifm; 3910 3911 ifm = nlmsg_data(nlh); 3912 ifm->ifa_family = AF_INET6; 3913 ifm->ifa_prefixlen = prefixlen; 3914 ifm->ifa_flags = flags; 3915 ifm->ifa_scope = scope; 3916 ifm->ifa_index = ifindex; 3917 } 3918 3919 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp, 3920 unsigned long tstamp, u32 preferred, u32 valid) 3921 { 3922 struct ifa_cacheinfo ci; 3923 3924 ci.cstamp = cstamp_delta(cstamp); 3925 ci.tstamp = cstamp_delta(tstamp); 3926 ci.ifa_prefered = preferred; 3927 ci.ifa_valid = valid; 3928 3929 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci); 3930 } 3931 3932 static inline int rt_scope(int ifa_scope) 3933 { 3934 if (ifa_scope & IFA_HOST) 3935 return RT_SCOPE_HOST; 3936 else if (ifa_scope & IFA_LINK) 3937 return RT_SCOPE_LINK; 3938 else if (ifa_scope & IFA_SITE) 3939 return RT_SCOPE_SITE; 3940 else 3941 return RT_SCOPE_UNIVERSE; 3942 } 3943 3944 static inline int inet6_ifaddr_msgsize(void) 3945 { 3946 return NLMSG_ALIGN(sizeof(struct ifaddrmsg)) 3947 + nla_total_size(16) /* IFA_LOCAL */ 3948 + nla_total_size(16) /* IFA_ADDRESS */ 3949 + nla_total_size(sizeof(struct ifa_cacheinfo)) 3950 + nla_total_size(4) /* IFA_FLAGS */; 3951 } 3952 3953 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa, 3954 u32 portid, u32 seq, int event, unsigned int flags) 3955 { 3956 struct nlmsghdr *nlh; 3957 u32 preferred, valid; 3958 3959 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags); 3960 if (nlh == NULL) 3961 return -EMSGSIZE; 3962 3963 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope), 3964 ifa->idev->dev->ifindex); 3965 3966 if (!((ifa->flags&IFA_F_PERMANENT) && 3967 (ifa->prefered_lft == INFINITY_LIFE_TIME))) { 3968 preferred = ifa->prefered_lft; 3969 valid = ifa->valid_lft; 3970 if (preferred != INFINITY_LIFE_TIME) { 3971 long tval = (jiffies - ifa->tstamp)/HZ; 3972 if (preferred > tval) 3973 preferred -= tval; 3974 else 3975 preferred = 0; 3976 if (valid != INFINITY_LIFE_TIME) { 3977 if (valid > tval) 3978 valid -= tval; 3979 else 3980 valid = 0; 3981 } 3982 } 3983 } else { 3984 preferred = INFINITY_LIFE_TIME; 3985 valid = INFINITY_LIFE_TIME; 3986 } 3987 3988 if (!ipv6_addr_any(&ifa->peer_addr)) { 3989 if (nla_put(skb, IFA_LOCAL, 16, &ifa->addr) < 0 || 3990 nla_put(skb, IFA_ADDRESS, 16, &ifa->peer_addr) < 0) 3991 goto error; 3992 } else 3993 if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0) 3994 goto error; 3995 3996 if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) 3997 goto error; 3998 3999 if (nla_put_u32(skb, IFA_FLAGS, ifa->flags) < 0) 4000 goto error; 4001 4002 return nlmsg_end(skb, nlh); 4003 4004 error: 4005 nlmsg_cancel(skb, nlh); 4006 return -EMSGSIZE; 4007 } 4008 4009 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca, 4010 u32 portid, u32 seq, int event, u16 flags) 4011 { 4012 struct nlmsghdr *nlh; 4013 u8 scope = RT_SCOPE_UNIVERSE; 4014 int ifindex = ifmca->idev->dev->ifindex; 4015 4016 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE) 4017 scope = RT_SCOPE_SITE; 4018 4019 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags); 4020 if (nlh == NULL) 4021 return -EMSGSIZE; 4022 4023 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 4024 if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 || 4025 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp, 4026 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 4027 nlmsg_cancel(skb, nlh); 4028 return -EMSGSIZE; 4029 } 4030 4031 return nlmsg_end(skb, nlh); 4032 } 4033 4034 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca, 4035 u32 portid, u32 seq, int event, unsigned int flags) 4036 { 4037 struct nlmsghdr *nlh; 4038 u8 scope = RT_SCOPE_UNIVERSE; 4039 int ifindex = ifaca->aca_idev->dev->ifindex; 4040 4041 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE) 4042 scope = RT_SCOPE_SITE; 4043 4044 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags); 4045 if (nlh == NULL) 4046 return -EMSGSIZE; 4047 4048 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 4049 if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 || 4050 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp, 4051 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 4052 nlmsg_cancel(skb, nlh); 4053 return -EMSGSIZE; 4054 } 4055 4056 return nlmsg_end(skb, nlh); 4057 } 4058 4059 enum addr_type_t { 4060 UNICAST_ADDR, 4061 MULTICAST_ADDR, 4062 ANYCAST_ADDR, 4063 }; 4064 4065 /* called with rcu_read_lock() */ 4066 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb, 4067 struct netlink_callback *cb, enum addr_type_t type, 4068 int s_ip_idx, int *p_ip_idx) 4069 { 4070 struct ifmcaddr6 *ifmca; 4071 struct ifacaddr6 *ifaca; 4072 int err = 1; 4073 int ip_idx = *p_ip_idx; 4074 4075 read_lock_bh(&idev->lock); 4076 switch (type) { 4077 case UNICAST_ADDR: { 4078 struct inet6_ifaddr *ifa; 4079 4080 /* unicast address incl. temp addr */ 4081 list_for_each_entry(ifa, &idev->addr_list, if_list) { 4082 if (++ip_idx < s_ip_idx) 4083 continue; 4084 err = inet6_fill_ifaddr(skb, ifa, 4085 NETLINK_CB(cb->skb).portid, 4086 cb->nlh->nlmsg_seq, 4087 RTM_NEWADDR, 4088 NLM_F_MULTI); 4089 if (err <= 0) 4090 break; 4091 nl_dump_check_consistent(cb, nlmsg_hdr(skb)); 4092 } 4093 break; 4094 } 4095 case MULTICAST_ADDR: 4096 /* multicast address */ 4097 for (ifmca = idev->mc_list; ifmca; 4098 ifmca = ifmca->next, ip_idx++) { 4099 if (ip_idx < s_ip_idx) 4100 continue; 4101 err = inet6_fill_ifmcaddr(skb, ifmca, 4102 NETLINK_CB(cb->skb).portid, 4103 cb->nlh->nlmsg_seq, 4104 RTM_GETMULTICAST, 4105 NLM_F_MULTI); 4106 if (err <= 0) 4107 break; 4108 } 4109 break; 4110 case ANYCAST_ADDR: 4111 /* anycast address */ 4112 for (ifaca = idev->ac_list; ifaca; 4113 ifaca = ifaca->aca_next, ip_idx++) { 4114 if (ip_idx < s_ip_idx) 4115 continue; 4116 err = inet6_fill_ifacaddr(skb, ifaca, 4117 NETLINK_CB(cb->skb).portid, 4118 cb->nlh->nlmsg_seq, 4119 RTM_GETANYCAST, 4120 NLM_F_MULTI); 4121 if (err <= 0) 4122 break; 4123 } 4124 break; 4125 default: 4126 break; 4127 } 4128 read_unlock_bh(&idev->lock); 4129 *p_ip_idx = ip_idx; 4130 return err; 4131 } 4132 4133 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb, 4134 enum addr_type_t type) 4135 { 4136 struct net *net = sock_net(skb->sk); 4137 int h, s_h; 4138 int idx, ip_idx; 4139 int s_idx, s_ip_idx; 4140 struct net_device *dev; 4141 struct inet6_dev *idev; 4142 struct hlist_head *head; 4143 4144 s_h = cb->args[0]; 4145 s_idx = idx = cb->args[1]; 4146 s_ip_idx = ip_idx = cb->args[2]; 4147 4148 rcu_read_lock(); 4149 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ net->dev_base_seq; 4150 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 4151 idx = 0; 4152 head = &net->dev_index_head[h]; 4153 hlist_for_each_entry_rcu(dev, head, index_hlist) { 4154 if (idx < s_idx) 4155 goto cont; 4156 if (h > s_h || idx > s_idx) 4157 s_ip_idx = 0; 4158 ip_idx = 0; 4159 idev = __in6_dev_get(dev); 4160 if (!idev) 4161 goto cont; 4162 4163 if (in6_dump_addrs(idev, skb, cb, type, 4164 s_ip_idx, &ip_idx) <= 0) 4165 goto done; 4166 cont: 4167 idx++; 4168 } 4169 } 4170 done: 4171 rcu_read_unlock(); 4172 cb->args[0] = h; 4173 cb->args[1] = idx; 4174 cb->args[2] = ip_idx; 4175 4176 return skb->len; 4177 } 4178 4179 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb) 4180 { 4181 enum addr_type_t type = UNICAST_ADDR; 4182 4183 return inet6_dump_addr(skb, cb, type); 4184 } 4185 4186 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb) 4187 { 4188 enum addr_type_t type = MULTICAST_ADDR; 4189 4190 return inet6_dump_addr(skb, cb, type); 4191 } 4192 4193 4194 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb) 4195 { 4196 enum addr_type_t type = ANYCAST_ADDR; 4197 4198 return inet6_dump_addr(skb, cb, type); 4199 } 4200 4201 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh) 4202 { 4203 struct net *net = sock_net(in_skb->sk); 4204 struct ifaddrmsg *ifm; 4205 struct nlattr *tb[IFA_MAX+1]; 4206 struct in6_addr *addr = NULL, *peer; 4207 struct net_device *dev = NULL; 4208 struct inet6_ifaddr *ifa; 4209 struct sk_buff *skb; 4210 int err; 4211 4212 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy); 4213 if (err < 0) 4214 goto errout; 4215 4216 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer); 4217 if (addr == NULL) { 4218 err = -EINVAL; 4219 goto errout; 4220 } 4221 4222 ifm = nlmsg_data(nlh); 4223 if (ifm->ifa_index) 4224 dev = __dev_get_by_index(net, ifm->ifa_index); 4225 4226 ifa = ipv6_get_ifaddr(net, addr, dev, 1); 4227 if (!ifa) { 4228 err = -EADDRNOTAVAIL; 4229 goto errout; 4230 } 4231 4232 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL); 4233 if (!skb) { 4234 err = -ENOBUFS; 4235 goto errout_ifa; 4236 } 4237 4238 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).portid, 4239 nlh->nlmsg_seq, RTM_NEWADDR, 0); 4240 if (err < 0) { 4241 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 4242 WARN_ON(err == -EMSGSIZE); 4243 kfree_skb(skb); 4244 goto errout_ifa; 4245 } 4246 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid); 4247 errout_ifa: 4248 in6_ifa_put(ifa); 4249 errout: 4250 return err; 4251 } 4252 4253 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa) 4254 { 4255 struct sk_buff *skb; 4256 struct net *net = dev_net(ifa->idev->dev); 4257 int err = -ENOBUFS; 4258 4259 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC); 4260 if (skb == NULL) 4261 goto errout; 4262 4263 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0); 4264 if (err < 0) { 4265 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 4266 WARN_ON(err == -EMSGSIZE); 4267 kfree_skb(skb); 4268 goto errout; 4269 } 4270 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC); 4271 return; 4272 errout: 4273 if (err < 0) 4274 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err); 4275 } 4276 4277 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf, 4278 __s32 *array, int bytes) 4279 { 4280 BUG_ON(bytes < (DEVCONF_MAX * 4)); 4281 4282 memset(array, 0, bytes); 4283 array[DEVCONF_FORWARDING] = cnf->forwarding; 4284 array[DEVCONF_HOPLIMIT] = cnf->hop_limit; 4285 array[DEVCONF_MTU6] = cnf->mtu6; 4286 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra; 4287 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects; 4288 array[DEVCONF_AUTOCONF] = cnf->autoconf; 4289 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits; 4290 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits; 4291 array[DEVCONF_RTR_SOLICIT_INTERVAL] = 4292 jiffies_to_msecs(cnf->rtr_solicit_interval); 4293 array[DEVCONF_RTR_SOLICIT_DELAY] = 4294 jiffies_to_msecs(cnf->rtr_solicit_delay); 4295 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version; 4296 array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] = 4297 jiffies_to_msecs(cnf->mldv1_unsolicited_report_interval); 4298 array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] = 4299 jiffies_to_msecs(cnf->mldv2_unsolicited_report_interval); 4300 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr; 4301 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft; 4302 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft; 4303 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry; 4304 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor; 4305 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses; 4306 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr; 4307 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo; 4308 #ifdef CONFIG_IPV6_ROUTER_PREF 4309 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref; 4310 array[DEVCONF_RTR_PROBE_INTERVAL] = 4311 jiffies_to_msecs(cnf->rtr_probe_interval); 4312 #ifdef CONFIG_IPV6_ROUTE_INFO 4313 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen; 4314 #endif 4315 #endif 4316 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp; 4317 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route; 4318 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 4319 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad; 4320 #endif 4321 #ifdef CONFIG_IPV6_MROUTE 4322 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding; 4323 #endif 4324 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6; 4325 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad; 4326 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao; 4327 array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify; 4328 array[DEVCONF_SUPPRESS_FRAG_NDISC] = cnf->suppress_frag_ndisc; 4329 } 4330 4331 static inline size_t inet6_ifla6_size(void) 4332 { 4333 return nla_total_size(4) /* IFLA_INET6_FLAGS */ 4334 + nla_total_size(sizeof(struct ifla_cacheinfo)) 4335 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */ 4336 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */ 4337 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */ 4338 + nla_total_size(sizeof(struct in6_addr)); /* IFLA_INET6_TOKEN */ 4339 } 4340 4341 static inline size_t inet6_if_nlmsg_size(void) 4342 { 4343 return NLMSG_ALIGN(sizeof(struct ifinfomsg)) 4344 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */ 4345 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */ 4346 + nla_total_size(4) /* IFLA_MTU */ 4347 + nla_total_size(4) /* IFLA_LINK */ 4348 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */ 4349 } 4350 4351 static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib, 4352 int items, int bytes) 4353 { 4354 int i; 4355 int pad = bytes - sizeof(u64) * items; 4356 BUG_ON(pad < 0); 4357 4358 /* Use put_unaligned() because stats may not be aligned for u64. */ 4359 put_unaligned(items, &stats[0]); 4360 for (i = 1; i < items; i++) 4361 put_unaligned(atomic_long_read(&mib[i]), &stats[i]); 4362 4363 memset(&stats[items], 0, pad); 4364 } 4365 4366 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu **mib, 4367 int items, int bytes, size_t syncpoff) 4368 { 4369 int i; 4370 int pad = bytes - sizeof(u64) * items; 4371 BUG_ON(pad < 0); 4372 4373 /* Use put_unaligned() because stats may not be aligned for u64. */ 4374 put_unaligned(items, &stats[0]); 4375 for (i = 1; i < items; i++) 4376 put_unaligned(snmp_fold_field64(mib, i, syncpoff), &stats[i]); 4377 4378 memset(&stats[items], 0, pad); 4379 } 4380 4381 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype, 4382 int bytes) 4383 { 4384 switch (attrtype) { 4385 case IFLA_INET6_STATS: 4386 __snmp6_fill_stats64(stats, (void __percpu **)idev->stats.ipv6, 4387 IPSTATS_MIB_MAX, bytes, offsetof(struct ipstats_mib, syncp)); 4388 break; 4389 case IFLA_INET6_ICMP6STATS: 4390 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, ICMP6_MIB_MAX, bytes); 4391 break; 4392 } 4393 } 4394 4395 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev) 4396 { 4397 struct nlattr *nla; 4398 struct ifla_cacheinfo ci; 4399 4400 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags)) 4401 goto nla_put_failure; 4402 ci.max_reasm_len = IPV6_MAXPLEN; 4403 ci.tstamp = cstamp_delta(idev->tstamp); 4404 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time); 4405 ci.retrans_time = jiffies_to_msecs(NEIGH_VAR(idev->nd_parms, RETRANS_TIME)); 4406 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci)) 4407 goto nla_put_failure; 4408 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32)); 4409 if (nla == NULL) 4410 goto nla_put_failure; 4411 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla)); 4412 4413 /* XXX - MC not implemented */ 4414 4415 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64)); 4416 if (nla == NULL) 4417 goto nla_put_failure; 4418 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla)); 4419 4420 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64)); 4421 if (nla == NULL) 4422 goto nla_put_failure; 4423 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla)); 4424 4425 nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr)); 4426 if (nla == NULL) 4427 goto nla_put_failure; 4428 read_lock_bh(&idev->lock); 4429 memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla)); 4430 read_unlock_bh(&idev->lock); 4431 4432 return 0; 4433 4434 nla_put_failure: 4435 return -EMSGSIZE; 4436 } 4437 4438 static size_t inet6_get_link_af_size(const struct net_device *dev) 4439 { 4440 if (!__in6_dev_get(dev)) 4441 return 0; 4442 4443 return inet6_ifla6_size(); 4444 } 4445 4446 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev) 4447 { 4448 struct inet6_dev *idev = __in6_dev_get(dev); 4449 4450 if (!idev) 4451 return -ENODATA; 4452 4453 if (inet6_fill_ifla6_attrs(skb, idev) < 0) 4454 return -EMSGSIZE; 4455 4456 return 0; 4457 } 4458 4459 static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token) 4460 { 4461 struct inet6_ifaddr *ifp; 4462 struct net_device *dev = idev->dev; 4463 bool update_rs = false; 4464 struct in6_addr ll_addr; 4465 4466 ASSERT_RTNL(); 4467 4468 if (token == NULL) 4469 return -EINVAL; 4470 if (ipv6_addr_any(token)) 4471 return -EINVAL; 4472 if (dev->flags & (IFF_LOOPBACK | IFF_NOARP)) 4473 return -EINVAL; 4474 if (!ipv6_accept_ra(idev)) 4475 return -EINVAL; 4476 if (idev->cnf.rtr_solicits <= 0) 4477 return -EINVAL; 4478 4479 write_lock_bh(&idev->lock); 4480 4481 BUILD_BUG_ON(sizeof(token->s6_addr) != 16); 4482 memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8); 4483 4484 write_unlock_bh(&idev->lock); 4485 4486 if (!idev->dead && (idev->if_flags & IF_READY) && 4487 !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE | 4488 IFA_F_OPTIMISTIC)) { 4489 4490 /* If we're not ready, then normal ifup will take care 4491 * of this. Otherwise, we need to request our rs here. 4492 */ 4493 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters); 4494 update_rs = true; 4495 } 4496 4497 write_lock_bh(&idev->lock); 4498 4499 if (update_rs) { 4500 idev->if_flags |= IF_RS_SENT; 4501 idev->rs_probes = 1; 4502 addrconf_mod_rs_timer(idev, idev->cnf.rtr_solicit_interval); 4503 } 4504 4505 /* Well, that's kinda nasty ... */ 4506 list_for_each_entry(ifp, &idev->addr_list, if_list) { 4507 spin_lock(&ifp->lock); 4508 if (ifp->tokenized) { 4509 ifp->valid_lft = 0; 4510 ifp->prefered_lft = 0; 4511 } 4512 spin_unlock(&ifp->lock); 4513 } 4514 4515 write_unlock_bh(&idev->lock); 4516 addrconf_verify_rtnl(); 4517 return 0; 4518 } 4519 4520 static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla) 4521 { 4522 int err = -EINVAL; 4523 struct inet6_dev *idev = __in6_dev_get(dev); 4524 struct nlattr *tb[IFLA_INET6_MAX + 1]; 4525 4526 if (!idev) 4527 return -EAFNOSUPPORT; 4528 4529 if (nla_parse_nested(tb, IFLA_INET6_MAX, nla, NULL) < 0) 4530 BUG(); 4531 4532 if (tb[IFLA_INET6_TOKEN]) 4533 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN])); 4534 4535 return err; 4536 } 4537 4538 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev, 4539 u32 portid, u32 seq, int event, unsigned int flags) 4540 { 4541 struct net_device *dev = idev->dev; 4542 struct ifinfomsg *hdr; 4543 struct nlmsghdr *nlh; 4544 void *protoinfo; 4545 4546 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags); 4547 if (nlh == NULL) 4548 return -EMSGSIZE; 4549 4550 hdr = nlmsg_data(nlh); 4551 hdr->ifi_family = AF_INET6; 4552 hdr->__ifi_pad = 0; 4553 hdr->ifi_type = dev->type; 4554 hdr->ifi_index = dev->ifindex; 4555 hdr->ifi_flags = dev_get_flags(dev); 4556 hdr->ifi_change = 0; 4557 4558 if (nla_put_string(skb, IFLA_IFNAME, dev->name) || 4559 (dev->addr_len && 4560 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) || 4561 nla_put_u32(skb, IFLA_MTU, dev->mtu) || 4562 (dev->ifindex != dev->iflink && 4563 nla_put_u32(skb, IFLA_LINK, dev->iflink))) 4564 goto nla_put_failure; 4565 protoinfo = nla_nest_start(skb, IFLA_PROTINFO); 4566 if (protoinfo == NULL) 4567 goto nla_put_failure; 4568 4569 if (inet6_fill_ifla6_attrs(skb, idev) < 0) 4570 goto nla_put_failure; 4571 4572 nla_nest_end(skb, protoinfo); 4573 return nlmsg_end(skb, nlh); 4574 4575 nla_put_failure: 4576 nlmsg_cancel(skb, nlh); 4577 return -EMSGSIZE; 4578 } 4579 4580 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb) 4581 { 4582 struct net *net = sock_net(skb->sk); 4583 int h, s_h; 4584 int idx = 0, s_idx; 4585 struct net_device *dev; 4586 struct inet6_dev *idev; 4587 struct hlist_head *head; 4588 4589 s_h = cb->args[0]; 4590 s_idx = cb->args[1]; 4591 4592 rcu_read_lock(); 4593 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 4594 idx = 0; 4595 head = &net->dev_index_head[h]; 4596 hlist_for_each_entry_rcu(dev, head, index_hlist) { 4597 if (idx < s_idx) 4598 goto cont; 4599 idev = __in6_dev_get(dev); 4600 if (!idev) 4601 goto cont; 4602 if (inet6_fill_ifinfo(skb, idev, 4603 NETLINK_CB(cb->skb).portid, 4604 cb->nlh->nlmsg_seq, 4605 RTM_NEWLINK, NLM_F_MULTI) <= 0) 4606 goto out; 4607 cont: 4608 idx++; 4609 } 4610 } 4611 out: 4612 rcu_read_unlock(); 4613 cb->args[1] = idx; 4614 cb->args[0] = h; 4615 4616 return skb->len; 4617 } 4618 4619 void inet6_ifinfo_notify(int event, struct inet6_dev *idev) 4620 { 4621 struct sk_buff *skb; 4622 struct net *net = dev_net(idev->dev); 4623 int err = -ENOBUFS; 4624 4625 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC); 4626 if (skb == NULL) 4627 goto errout; 4628 4629 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0); 4630 if (err < 0) { 4631 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */ 4632 WARN_ON(err == -EMSGSIZE); 4633 kfree_skb(skb); 4634 goto errout; 4635 } 4636 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC); 4637 return; 4638 errout: 4639 if (err < 0) 4640 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err); 4641 } 4642 4643 static inline size_t inet6_prefix_nlmsg_size(void) 4644 { 4645 return NLMSG_ALIGN(sizeof(struct prefixmsg)) 4646 + nla_total_size(sizeof(struct in6_addr)) 4647 + nla_total_size(sizeof(struct prefix_cacheinfo)); 4648 } 4649 4650 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev, 4651 struct prefix_info *pinfo, u32 portid, u32 seq, 4652 int event, unsigned int flags) 4653 { 4654 struct prefixmsg *pmsg; 4655 struct nlmsghdr *nlh; 4656 struct prefix_cacheinfo ci; 4657 4658 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags); 4659 if (nlh == NULL) 4660 return -EMSGSIZE; 4661 4662 pmsg = nlmsg_data(nlh); 4663 pmsg->prefix_family = AF_INET6; 4664 pmsg->prefix_pad1 = 0; 4665 pmsg->prefix_pad2 = 0; 4666 pmsg->prefix_ifindex = idev->dev->ifindex; 4667 pmsg->prefix_len = pinfo->prefix_len; 4668 pmsg->prefix_type = pinfo->type; 4669 pmsg->prefix_pad3 = 0; 4670 pmsg->prefix_flags = 0; 4671 if (pinfo->onlink) 4672 pmsg->prefix_flags |= IF_PREFIX_ONLINK; 4673 if (pinfo->autoconf) 4674 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF; 4675 4676 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix)) 4677 goto nla_put_failure; 4678 ci.preferred_time = ntohl(pinfo->prefered); 4679 ci.valid_time = ntohl(pinfo->valid); 4680 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci)) 4681 goto nla_put_failure; 4682 return nlmsg_end(skb, nlh); 4683 4684 nla_put_failure: 4685 nlmsg_cancel(skb, nlh); 4686 return -EMSGSIZE; 4687 } 4688 4689 static void inet6_prefix_notify(int event, struct inet6_dev *idev, 4690 struct prefix_info *pinfo) 4691 { 4692 struct sk_buff *skb; 4693 struct net *net = dev_net(idev->dev); 4694 int err = -ENOBUFS; 4695 4696 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC); 4697 if (skb == NULL) 4698 goto errout; 4699 4700 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0); 4701 if (err < 0) { 4702 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */ 4703 WARN_ON(err == -EMSGSIZE); 4704 kfree_skb(skb); 4705 goto errout; 4706 } 4707 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC); 4708 return; 4709 errout: 4710 if (err < 0) 4711 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err); 4712 } 4713 4714 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 4715 { 4716 struct net *net = dev_net(ifp->idev->dev); 4717 4718 if (event) 4719 ASSERT_RTNL(); 4720 4721 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp); 4722 4723 switch (event) { 4724 case RTM_NEWADDR: 4725 /* 4726 * If the address was optimistic 4727 * we inserted the route at the start of 4728 * our DAD process, so we don't need 4729 * to do it again 4730 */ 4731 if (!(ifp->rt->rt6i_node)) 4732 ip6_ins_rt(ifp->rt); 4733 if (ifp->idev->cnf.forwarding) 4734 addrconf_join_anycast(ifp); 4735 if (!ipv6_addr_any(&ifp->peer_addr)) 4736 addrconf_prefix_route(&ifp->peer_addr, 128, 4737 ifp->idev->dev, 0, 0); 4738 break; 4739 case RTM_DELADDR: 4740 if (ifp->idev->cnf.forwarding) 4741 addrconf_leave_anycast(ifp); 4742 addrconf_leave_solict(ifp->idev, &ifp->addr); 4743 if (!ipv6_addr_any(&ifp->peer_addr)) { 4744 struct rt6_info *rt; 4745 struct net_device *dev = ifp->idev->dev; 4746 4747 rt = rt6_lookup(dev_net(dev), &ifp->peer_addr, NULL, 4748 dev->ifindex, 1); 4749 if (rt) { 4750 dst_hold(&rt->dst); 4751 if (ip6_del_rt(rt)) 4752 dst_free(&rt->dst); 4753 } 4754 } 4755 dst_hold(&ifp->rt->dst); 4756 4757 if (ip6_del_rt(ifp->rt)) 4758 dst_free(&ifp->rt->dst); 4759 break; 4760 } 4761 atomic_inc(&net->ipv6.dev_addr_genid); 4762 rt_genid_bump_ipv6(net); 4763 } 4764 4765 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 4766 { 4767 rcu_read_lock_bh(); 4768 if (likely(ifp->idev->dead == 0)) 4769 __ipv6_ifa_notify(event, ifp); 4770 rcu_read_unlock_bh(); 4771 } 4772 4773 #ifdef CONFIG_SYSCTL 4774 4775 static 4776 int addrconf_sysctl_forward(struct ctl_table *ctl, int write, 4777 void __user *buffer, size_t *lenp, loff_t *ppos) 4778 { 4779 int *valp = ctl->data; 4780 int val = *valp; 4781 loff_t pos = *ppos; 4782 struct ctl_table lctl; 4783 int ret; 4784 4785 /* 4786 * ctl->data points to idev->cnf.forwarding, we should 4787 * not modify it until we get the rtnl lock. 4788 */ 4789 lctl = *ctl; 4790 lctl.data = &val; 4791 4792 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 4793 4794 if (write) 4795 ret = addrconf_fixup_forwarding(ctl, valp, val); 4796 if (ret) 4797 *ppos = pos; 4798 return ret; 4799 } 4800 4801 static void dev_disable_change(struct inet6_dev *idev) 4802 { 4803 struct netdev_notifier_info info; 4804 4805 if (!idev || !idev->dev) 4806 return; 4807 4808 netdev_notifier_info_init(&info, idev->dev); 4809 if (idev->cnf.disable_ipv6) 4810 addrconf_notify(NULL, NETDEV_DOWN, &info); 4811 else 4812 addrconf_notify(NULL, NETDEV_UP, &info); 4813 } 4814 4815 static void addrconf_disable_change(struct net *net, __s32 newf) 4816 { 4817 struct net_device *dev; 4818 struct inet6_dev *idev; 4819 4820 rcu_read_lock(); 4821 for_each_netdev_rcu(net, dev) { 4822 idev = __in6_dev_get(dev); 4823 if (idev) { 4824 int changed = (!idev->cnf.disable_ipv6) ^ (!newf); 4825 idev->cnf.disable_ipv6 = newf; 4826 if (changed) 4827 dev_disable_change(idev); 4828 } 4829 } 4830 rcu_read_unlock(); 4831 } 4832 4833 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf) 4834 { 4835 struct net *net; 4836 int old; 4837 4838 if (!rtnl_trylock()) 4839 return restart_syscall(); 4840 4841 net = (struct net *)table->extra2; 4842 old = *p; 4843 *p = newf; 4844 4845 if (p == &net->ipv6.devconf_dflt->disable_ipv6) { 4846 rtnl_unlock(); 4847 return 0; 4848 } 4849 4850 if (p == &net->ipv6.devconf_all->disable_ipv6) { 4851 net->ipv6.devconf_dflt->disable_ipv6 = newf; 4852 addrconf_disable_change(net, newf); 4853 } else if ((!newf) ^ (!old)) 4854 dev_disable_change((struct inet6_dev *)table->extra1); 4855 4856 rtnl_unlock(); 4857 return 0; 4858 } 4859 4860 static 4861 int addrconf_sysctl_disable(struct ctl_table *ctl, int write, 4862 void __user *buffer, size_t *lenp, loff_t *ppos) 4863 { 4864 int *valp = ctl->data; 4865 int val = *valp; 4866 loff_t pos = *ppos; 4867 struct ctl_table lctl; 4868 int ret; 4869 4870 /* 4871 * ctl->data points to idev->cnf.disable_ipv6, we should 4872 * not modify it until we get the rtnl lock. 4873 */ 4874 lctl = *ctl; 4875 lctl.data = &val; 4876 4877 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 4878 4879 if (write) 4880 ret = addrconf_disable_ipv6(ctl, valp, val); 4881 if (ret) 4882 *ppos = pos; 4883 return ret; 4884 } 4885 4886 static 4887 int addrconf_sysctl_proxy_ndp(struct ctl_table *ctl, int write, 4888 void __user *buffer, size_t *lenp, loff_t *ppos) 4889 { 4890 int *valp = ctl->data; 4891 int ret; 4892 int old, new; 4893 4894 old = *valp; 4895 ret = proc_dointvec(ctl, write, buffer, lenp, ppos); 4896 new = *valp; 4897 4898 if (write && old != new) { 4899 struct net *net = ctl->extra2; 4900 4901 if (!rtnl_trylock()) 4902 return restart_syscall(); 4903 4904 if (valp == &net->ipv6.devconf_dflt->proxy_ndp) 4905 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH, 4906 NETCONFA_IFINDEX_DEFAULT, 4907 net->ipv6.devconf_dflt); 4908 else if (valp == &net->ipv6.devconf_all->proxy_ndp) 4909 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH, 4910 NETCONFA_IFINDEX_ALL, 4911 net->ipv6.devconf_all); 4912 else { 4913 struct inet6_dev *idev = ctl->extra1; 4914 4915 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH, 4916 idev->dev->ifindex, 4917 &idev->cnf); 4918 } 4919 rtnl_unlock(); 4920 } 4921 4922 return ret; 4923 } 4924 4925 4926 static struct addrconf_sysctl_table 4927 { 4928 struct ctl_table_header *sysctl_header; 4929 struct ctl_table addrconf_vars[DEVCONF_MAX+1]; 4930 } addrconf_sysctl __read_mostly = { 4931 .sysctl_header = NULL, 4932 .addrconf_vars = { 4933 { 4934 .procname = "forwarding", 4935 .data = &ipv6_devconf.forwarding, 4936 .maxlen = sizeof(int), 4937 .mode = 0644, 4938 .proc_handler = addrconf_sysctl_forward, 4939 }, 4940 { 4941 .procname = "hop_limit", 4942 .data = &ipv6_devconf.hop_limit, 4943 .maxlen = sizeof(int), 4944 .mode = 0644, 4945 .proc_handler = proc_dointvec, 4946 }, 4947 { 4948 .procname = "mtu", 4949 .data = &ipv6_devconf.mtu6, 4950 .maxlen = sizeof(int), 4951 .mode = 0644, 4952 .proc_handler = proc_dointvec, 4953 }, 4954 { 4955 .procname = "accept_ra", 4956 .data = &ipv6_devconf.accept_ra, 4957 .maxlen = sizeof(int), 4958 .mode = 0644, 4959 .proc_handler = proc_dointvec, 4960 }, 4961 { 4962 .procname = "accept_redirects", 4963 .data = &ipv6_devconf.accept_redirects, 4964 .maxlen = sizeof(int), 4965 .mode = 0644, 4966 .proc_handler = proc_dointvec, 4967 }, 4968 { 4969 .procname = "autoconf", 4970 .data = &ipv6_devconf.autoconf, 4971 .maxlen = sizeof(int), 4972 .mode = 0644, 4973 .proc_handler = proc_dointvec, 4974 }, 4975 { 4976 .procname = "dad_transmits", 4977 .data = &ipv6_devconf.dad_transmits, 4978 .maxlen = sizeof(int), 4979 .mode = 0644, 4980 .proc_handler = proc_dointvec, 4981 }, 4982 { 4983 .procname = "router_solicitations", 4984 .data = &ipv6_devconf.rtr_solicits, 4985 .maxlen = sizeof(int), 4986 .mode = 0644, 4987 .proc_handler = proc_dointvec, 4988 }, 4989 { 4990 .procname = "router_solicitation_interval", 4991 .data = &ipv6_devconf.rtr_solicit_interval, 4992 .maxlen = sizeof(int), 4993 .mode = 0644, 4994 .proc_handler = proc_dointvec_jiffies, 4995 }, 4996 { 4997 .procname = "router_solicitation_delay", 4998 .data = &ipv6_devconf.rtr_solicit_delay, 4999 .maxlen = sizeof(int), 5000 .mode = 0644, 5001 .proc_handler = proc_dointvec_jiffies, 5002 }, 5003 { 5004 .procname = "force_mld_version", 5005 .data = &ipv6_devconf.force_mld_version, 5006 .maxlen = sizeof(int), 5007 .mode = 0644, 5008 .proc_handler = proc_dointvec, 5009 }, 5010 { 5011 .procname = "mldv1_unsolicited_report_interval", 5012 .data = 5013 &ipv6_devconf.mldv1_unsolicited_report_interval, 5014 .maxlen = sizeof(int), 5015 .mode = 0644, 5016 .proc_handler = proc_dointvec_ms_jiffies, 5017 }, 5018 { 5019 .procname = "mldv2_unsolicited_report_interval", 5020 .data = 5021 &ipv6_devconf.mldv2_unsolicited_report_interval, 5022 .maxlen = sizeof(int), 5023 .mode = 0644, 5024 .proc_handler = proc_dointvec_ms_jiffies, 5025 }, 5026 { 5027 .procname = "use_tempaddr", 5028 .data = &ipv6_devconf.use_tempaddr, 5029 .maxlen = sizeof(int), 5030 .mode = 0644, 5031 .proc_handler = proc_dointvec, 5032 }, 5033 { 5034 .procname = "temp_valid_lft", 5035 .data = &ipv6_devconf.temp_valid_lft, 5036 .maxlen = sizeof(int), 5037 .mode = 0644, 5038 .proc_handler = proc_dointvec, 5039 }, 5040 { 5041 .procname = "temp_prefered_lft", 5042 .data = &ipv6_devconf.temp_prefered_lft, 5043 .maxlen = sizeof(int), 5044 .mode = 0644, 5045 .proc_handler = proc_dointvec, 5046 }, 5047 { 5048 .procname = "regen_max_retry", 5049 .data = &ipv6_devconf.regen_max_retry, 5050 .maxlen = sizeof(int), 5051 .mode = 0644, 5052 .proc_handler = proc_dointvec, 5053 }, 5054 { 5055 .procname = "max_desync_factor", 5056 .data = &ipv6_devconf.max_desync_factor, 5057 .maxlen = sizeof(int), 5058 .mode = 0644, 5059 .proc_handler = proc_dointvec, 5060 }, 5061 { 5062 .procname = "max_addresses", 5063 .data = &ipv6_devconf.max_addresses, 5064 .maxlen = sizeof(int), 5065 .mode = 0644, 5066 .proc_handler = proc_dointvec, 5067 }, 5068 { 5069 .procname = "accept_ra_defrtr", 5070 .data = &ipv6_devconf.accept_ra_defrtr, 5071 .maxlen = sizeof(int), 5072 .mode = 0644, 5073 .proc_handler = proc_dointvec, 5074 }, 5075 { 5076 .procname = "accept_ra_pinfo", 5077 .data = &ipv6_devconf.accept_ra_pinfo, 5078 .maxlen = sizeof(int), 5079 .mode = 0644, 5080 .proc_handler = proc_dointvec, 5081 }, 5082 #ifdef CONFIG_IPV6_ROUTER_PREF 5083 { 5084 .procname = "accept_ra_rtr_pref", 5085 .data = &ipv6_devconf.accept_ra_rtr_pref, 5086 .maxlen = sizeof(int), 5087 .mode = 0644, 5088 .proc_handler = proc_dointvec, 5089 }, 5090 { 5091 .procname = "router_probe_interval", 5092 .data = &ipv6_devconf.rtr_probe_interval, 5093 .maxlen = sizeof(int), 5094 .mode = 0644, 5095 .proc_handler = proc_dointvec_jiffies, 5096 }, 5097 #ifdef CONFIG_IPV6_ROUTE_INFO 5098 { 5099 .procname = "accept_ra_rt_info_max_plen", 5100 .data = &ipv6_devconf.accept_ra_rt_info_max_plen, 5101 .maxlen = sizeof(int), 5102 .mode = 0644, 5103 .proc_handler = proc_dointvec, 5104 }, 5105 #endif 5106 #endif 5107 { 5108 .procname = "proxy_ndp", 5109 .data = &ipv6_devconf.proxy_ndp, 5110 .maxlen = sizeof(int), 5111 .mode = 0644, 5112 .proc_handler = addrconf_sysctl_proxy_ndp, 5113 }, 5114 { 5115 .procname = "accept_source_route", 5116 .data = &ipv6_devconf.accept_source_route, 5117 .maxlen = sizeof(int), 5118 .mode = 0644, 5119 .proc_handler = proc_dointvec, 5120 }, 5121 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 5122 { 5123 .procname = "optimistic_dad", 5124 .data = &ipv6_devconf.optimistic_dad, 5125 .maxlen = sizeof(int), 5126 .mode = 0644, 5127 .proc_handler = proc_dointvec, 5128 5129 }, 5130 #endif 5131 #ifdef CONFIG_IPV6_MROUTE 5132 { 5133 .procname = "mc_forwarding", 5134 .data = &ipv6_devconf.mc_forwarding, 5135 .maxlen = sizeof(int), 5136 .mode = 0444, 5137 .proc_handler = proc_dointvec, 5138 }, 5139 #endif 5140 { 5141 .procname = "disable_ipv6", 5142 .data = &ipv6_devconf.disable_ipv6, 5143 .maxlen = sizeof(int), 5144 .mode = 0644, 5145 .proc_handler = addrconf_sysctl_disable, 5146 }, 5147 { 5148 .procname = "accept_dad", 5149 .data = &ipv6_devconf.accept_dad, 5150 .maxlen = sizeof(int), 5151 .mode = 0644, 5152 .proc_handler = proc_dointvec, 5153 }, 5154 { 5155 .procname = "force_tllao", 5156 .data = &ipv6_devconf.force_tllao, 5157 .maxlen = sizeof(int), 5158 .mode = 0644, 5159 .proc_handler = proc_dointvec 5160 }, 5161 { 5162 .procname = "ndisc_notify", 5163 .data = &ipv6_devconf.ndisc_notify, 5164 .maxlen = sizeof(int), 5165 .mode = 0644, 5166 .proc_handler = proc_dointvec 5167 }, 5168 { 5169 .procname = "suppress_frag_ndisc", 5170 .data = &ipv6_devconf.suppress_frag_ndisc, 5171 .maxlen = sizeof(int), 5172 .mode = 0644, 5173 .proc_handler = proc_dointvec 5174 }, 5175 { 5176 /* sentinel */ 5177 } 5178 }, 5179 }; 5180 5181 static int __addrconf_sysctl_register(struct net *net, char *dev_name, 5182 struct inet6_dev *idev, struct ipv6_devconf *p) 5183 { 5184 int i; 5185 struct addrconf_sysctl_table *t; 5186 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ]; 5187 5188 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL); 5189 if (t == NULL) 5190 goto out; 5191 5192 for (i = 0; t->addrconf_vars[i].data; i++) { 5193 t->addrconf_vars[i].data += (char *)p - (char *)&ipv6_devconf; 5194 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */ 5195 t->addrconf_vars[i].extra2 = net; 5196 } 5197 5198 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name); 5199 5200 t->sysctl_header = register_net_sysctl(net, path, t->addrconf_vars); 5201 if (t->sysctl_header == NULL) 5202 goto free; 5203 5204 p->sysctl = t; 5205 return 0; 5206 5207 free: 5208 kfree(t); 5209 out: 5210 return -ENOBUFS; 5211 } 5212 5213 static void __addrconf_sysctl_unregister(struct ipv6_devconf *p) 5214 { 5215 struct addrconf_sysctl_table *t; 5216 5217 if (p->sysctl == NULL) 5218 return; 5219 5220 t = p->sysctl; 5221 p->sysctl = NULL; 5222 unregister_net_sysctl_table(t->sysctl_header); 5223 kfree(t); 5224 } 5225 5226 static void addrconf_sysctl_register(struct inet6_dev *idev) 5227 { 5228 neigh_sysctl_register(idev->dev, idev->nd_parms, 5229 &ndisc_ifinfo_sysctl_change); 5230 __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name, 5231 idev, &idev->cnf); 5232 } 5233 5234 static void addrconf_sysctl_unregister(struct inet6_dev *idev) 5235 { 5236 __addrconf_sysctl_unregister(&idev->cnf); 5237 neigh_sysctl_unregister(idev->nd_parms); 5238 } 5239 5240 5241 #endif 5242 5243 static int __net_init addrconf_init_net(struct net *net) 5244 { 5245 int err = -ENOMEM; 5246 struct ipv6_devconf *all, *dflt; 5247 5248 all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL); 5249 if (all == NULL) 5250 goto err_alloc_all; 5251 5252 dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL); 5253 if (dflt == NULL) 5254 goto err_alloc_dflt; 5255 5256 /* these will be inherited by all namespaces */ 5257 dflt->autoconf = ipv6_defaults.autoconf; 5258 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6; 5259 5260 net->ipv6.devconf_all = all; 5261 net->ipv6.devconf_dflt = dflt; 5262 5263 #ifdef CONFIG_SYSCTL 5264 err = __addrconf_sysctl_register(net, "all", NULL, all); 5265 if (err < 0) 5266 goto err_reg_all; 5267 5268 err = __addrconf_sysctl_register(net, "default", NULL, dflt); 5269 if (err < 0) 5270 goto err_reg_dflt; 5271 #endif 5272 return 0; 5273 5274 #ifdef CONFIG_SYSCTL 5275 err_reg_dflt: 5276 __addrconf_sysctl_unregister(all); 5277 err_reg_all: 5278 kfree(dflt); 5279 #endif 5280 err_alloc_dflt: 5281 kfree(all); 5282 err_alloc_all: 5283 return err; 5284 } 5285 5286 static void __net_exit addrconf_exit_net(struct net *net) 5287 { 5288 #ifdef CONFIG_SYSCTL 5289 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt); 5290 __addrconf_sysctl_unregister(net->ipv6.devconf_all); 5291 #endif 5292 if (!net_eq(net, &init_net)) { 5293 kfree(net->ipv6.devconf_dflt); 5294 kfree(net->ipv6.devconf_all); 5295 } 5296 } 5297 5298 static struct pernet_operations addrconf_ops = { 5299 .init = addrconf_init_net, 5300 .exit = addrconf_exit_net, 5301 }; 5302 5303 static struct rtnl_af_ops inet6_ops = { 5304 .family = AF_INET6, 5305 .fill_link_af = inet6_fill_link_af, 5306 .get_link_af_size = inet6_get_link_af_size, 5307 .set_link_af = inet6_set_link_af, 5308 }; 5309 5310 /* 5311 * Init / cleanup code 5312 */ 5313 5314 int __init addrconf_init(void) 5315 { 5316 int i, err; 5317 5318 err = ipv6_addr_label_init(); 5319 if (err < 0) { 5320 pr_crit("%s: cannot initialize default policy table: %d\n", 5321 __func__, err); 5322 goto out; 5323 } 5324 5325 err = register_pernet_subsys(&addrconf_ops); 5326 if (err < 0) 5327 goto out_addrlabel; 5328 5329 addrconf_wq = create_workqueue("ipv6_addrconf"); 5330 if (!addrconf_wq) { 5331 err = -ENOMEM; 5332 goto out_nowq; 5333 } 5334 5335 /* The addrconf netdev notifier requires that loopback_dev 5336 * has it's ipv6 private information allocated and setup 5337 * before it can bring up and give link-local addresses 5338 * to other devices which are up. 5339 * 5340 * Unfortunately, loopback_dev is not necessarily the first 5341 * entry in the global dev_base list of net devices. In fact, 5342 * it is likely to be the very last entry on that list. 5343 * So this causes the notifier registry below to try and 5344 * give link-local addresses to all devices besides loopback_dev 5345 * first, then loopback_dev, which cases all the non-loopback_dev 5346 * devices to fail to get a link-local address. 5347 * 5348 * So, as a temporary fix, allocate the ipv6 structure for 5349 * loopback_dev first by hand. 5350 * Longer term, all of the dependencies ipv6 has upon the loopback 5351 * device and it being up should be removed. 5352 */ 5353 rtnl_lock(); 5354 if (!ipv6_add_dev(init_net.loopback_dev)) 5355 err = -ENOMEM; 5356 rtnl_unlock(); 5357 if (err) 5358 goto errlo; 5359 5360 for (i = 0; i < IN6_ADDR_HSIZE; i++) 5361 INIT_HLIST_HEAD(&inet6_addr_lst[i]); 5362 5363 register_netdevice_notifier(&ipv6_dev_notf); 5364 5365 addrconf_verify(); 5366 5367 rtnl_af_register(&inet6_ops); 5368 5369 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo, 5370 NULL); 5371 if (err < 0) 5372 goto errout; 5373 5374 /* Only the first call to __rtnl_register can fail */ 5375 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL, NULL); 5376 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL, NULL); 5377 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr, 5378 inet6_dump_ifaddr, NULL); 5379 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL, 5380 inet6_dump_ifmcaddr, NULL); 5381 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL, 5382 inet6_dump_ifacaddr, NULL); 5383 __rtnl_register(PF_INET6, RTM_GETNETCONF, inet6_netconf_get_devconf, 5384 inet6_netconf_dump_devconf, NULL); 5385 5386 ipv6_addr_label_rtnl_register(); 5387 5388 return 0; 5389 errout: 5390 rtnl_af_unregister(&inet6_ops); 5391 unregister_netdevice_notifier(&ipv6_dev_notf); 5392 errlo: 5393 destroy_workqueue(addrconf_wq); 5394 out_nowq: 5395 unregister_pernet_subsys(&addrconf_ops); 5396 out_addrlabel: 5397 ipv6_addr_label_cleanup(); 5398 out: 5399 return err; 5400 } 5401 5402 void addrconf_cleanup(void) 5403 { 5404 struct net_device *dev; 5405 int i; 5406 5407 unregister_netdevice_notifier(&ipv6_dev_notf); 5408 unregister_pernet_subsys(&addrconf_ops); 5409 ipv6_addr_label_cleanup(); 5410 5411 rtnl_lock(); 5412 5413 __rtnl_af_unregister(&inet6_ops); 5414 5415 /* clean dev list */ 5416 for_each_netdev(&init_net, dev) { 5417 if (__in6_dev_get(dev) == NULL) 5418 continue; 5419 addrconf_ifdown(dev, 1); 5420 } 5421 addrconf_ifdown(init_net.loopback_dev, 2); 5422 5423 /* 5424 * Check hash table. 5425 */ 5426 spin_lock_bh(&addrconf_hash_lock); 5427 for (i = 0; i < IN6_ADDR_HSIZE; i++) 5428 WARN_ON(!hlist_empty(&inet6_addr_lst[i])); 5429 spin_unlock_bh(&addrconf_hash_lock); 5430 cancel_delayed_work(&addr_chk_work); 5431 rtnl_unlock(); 5432 5433 destroy_workqueue(addrconf_wq); 5434 } 5435