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 int addrconf_sysctl_register(struct inet6_dev *idev); 112 static void addrconf_sysctl_unregister(struct inet6_dev *idev); 113 #else 114 static inline int addrconf_sysctl_register(struct inet6_dev *idev) 115 { 116 return 0; 117 } 118 119 static inline void addrconf_sysctl_unregister(struct inet6_dev *idev) 120 { 121 } 122 #endif 123 124 static void __ipv6_regen_rndid(struct inet6_dev *idev); 125 static void __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr); 126 static void ipv6_regen_rndid(unsigned long data); 127 128 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev); 129 static int ipv6_count_addresses(struct inet6_dev *idev); 130 131 /* 132 * Configured unicast address hash table 133 */ 134 static struct hlist_head inet6_addr_lst[IN6_ADDR_HSIZE]; 135 static DEFINE_SPINLOCK(addrconf_hash_lock); 136 137 static void addrconf_verify(void); 138 static void addrconf_verify_rtnl(void); 139 static void addrconf_verify_work(struct work_struct *); 140 141 static struct workqueue_struct *addrconf_wq; 142 static DECLARE_DELAYED_WORK(addr_chk_work, addrconf_verify_work); 143 144 static void addrconf_join_anycast(struct inet6_ifaddr *ifp); 145 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp); 146 147 static void addrconf_type_change(struct net_device *dev, 148 unsigned long event); 149 static int addrconf_ifdown(struct net_device *dev, int how); 150 151 static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx, 152 int plen, 153 const struct net_device *dev, 154 u32 flags, u32 noflags); 155 156 static void addrconf_dad_start(struct inet6_ifaddr *ifp); 157 static void addrconf_dad_work(struct work_struct *w); 158 static void addrconf_dad_completed(struct inet6_ifaddr *ifp); 159 static void addrconf_dad_run(struct inet6_dev *idev); 160 static void addrconf_rs_timer(unsigned long data); 161 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa); 162 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa); 163 164 static void inet6_prefix_notify(int event, struct inet6_dev *idev, 165 struct prefix_info *pinfo); 166 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr, 167 struct net_device *dev); 168 169 static struct ipv6_devconf ipv6_devconf __read_mostly = { 170 .forwarding = 0, 171 .hop_limit = IPV6_DEFAULT_HOPLIMIT, 172 .mtu6 = IPV6_MIN_MTU, 173 .accept_ra = 1, 174 .accept_redirects = 1, 175 .autoconf = 1, 176 .force_mld_version = 0, 177 .mldv1_unsolicited_report_interval = 10 * HZ, 178 .mldv2_unsolicited_report_interval = HZ, 179 .dad_transmits = 1, 180 .rtr_solicits = MAX_RTR_SOLICITATIONS, 181 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL, 182 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY, 183 .use_tempaddr = 0, 184 .temp_valid_lft = TEMP_VALID_LIFETIME, 185 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME, 186 .regen_max_retry = REGEN_MAX_RETRY, 187 .max_desync_factor = MAX_DESYNC_FACTOR, 188 .max_addresses = IPV6_MAX_ADDRESSES, 189 .accept_ra_defrtr = 1, 190 .accept_ra_from_local = 0, 191 .accept_ra_pinfo = 1, 192 #ifdef CONFIG_IPV6_ROUTER_PREF 193 .accept_ra_rtr_pref = 1, 194 .rtr_probe_interval = 60 * HZ, 195 #ifdef CONFIG_IPV6_ROUTE_INFO 196 .accept_ra_rt_info_max_plen = 0, 197 #endif 198 #endif 199 .proxy_ndp = 0, 200 .accept_source_route = 0, /* we do not accept RH0 by default. */ 201 .disable_ipv6 = 0, 202 .accept_dad = 1, 203 .suppress_frag_ndisc = 1, 204 }; 205 206 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = { 207 .forwarding = 0, 208 .hop_limit = IPV6_DEFAULT_HOPLIMIT, 209 .mtu6 = IPV6_MIN_MTU, 210 .accept_ra = 1, 211 .accept_redirects = 1, 212 .autoconf = 1, 213 .force_mld_version = 0, 214 .mldv1_unsolicited_report_interval = 10 * HZ, 215 .mldv2_unsolicited_report_interval = HZ, 216 .dad_transmits = 1, 217 .rtr_solicits = MAX_RTR_SOLICITATIONS, 218 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL, 219 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY, 220 .use_tempaddr = 0, 221 .temp_valid_lft = TEMP_VALID_LIFETIME, 222 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME, 223 .regen_max_retry = REGEN_MAX_RETRY, 224 .max_desync_factor = MAX_DESYNC_FACTOR, 225 .max_addresses = IPV6_MAX_ADDRESSES, 226 .accept_ra_defrtr = 1, 227 .accept_ra_from_local = 0, 228 .accept_ra_pinfo = 1, 229 #ifdef CONFIG_IPV6_ROUTER_PREF 230 .accept_ra_rtr_pref = 1, 231 .rtr_probe_interval = 60 * HZ, 232 #ifdef CONFIG_IPV6_ROUTE_INFO 233 .accept_ra_rt_info_max_plen = 0, 234 #endif 235 #endif 236 .proxy_ndp = 0, 237 .accept_source_route = 0, /* we do not accept RH0 by default. */ 238 .disable_ipv6 = 0, 239 .accept_dad = 1, 240 .suppress_frag_ndisc = 1, 241 }; 242 243 /* Check if a valid qdisc is available */ 244 static inline bool addrconf_qdisc_ok(const struct net_device *dev) 245 { 246 return !qdisc_tx_is_noop(dev); 247 } 248 249 static void addrconf_del_rs_timer(struct inet6_dev *idev) 250 { 251 if (del_timer(&idev->rs_timer)) 252 __in6_dev_put(idev); 253 } 254 255 static void addrconf_del_dad_work(struct inet6_ifaddr *ifp) 256 { 257 if (cancel_delayed_work(&ifp->dad_work)) 258 __in6_ifa_put(ifp); 259 } 260 261 static void addrconf_mod_rs_timer(struct inet6_dev *idev, 262 unsigned long when) 263 { 264 if (!timer_pending(&idev->rs_timer)) 265 in6_dev_hold(idev); 266 mod_timer(&idev->rs_timer, jiffies + when); 267 } 268 269 static void addrconf_mod_dad_work(struct inet6_ifaddr *ifp, 270 unsigned long delay) 271 { 272 if (!delayed_work_pending(&ifp->dad_work)) 273 in6_ifa_hold(ifp); 274 mod_delayed_work(addrconf_wq, &ifp->dad_work, delay); 275 } 276 277 static int snmp6_alloc_dev(struct inet6_dev *idev) 278 { 279 int i; 280 281 idev->stats.ipv6 = alloc_percpu(struct ipstats_mib); 282 if (!idev->stats.ipv6) 283 goto err_ip; 284 285 for_each_possible_cpu(i) { 286 struct ipstats_mib *addrconf_stats; 287 addrconf_stats = per_cpu_ptr(idev->stats.ipv6, i); 288 u64_stats_init(&addrconf_stats->syncp); 289 } 290 291 292 idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device), 293 GFP_KERNEL); 294 if (!idev->stats.icmpv6dev) 295 goto err_icmp; 296 idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device), 297 GFP_KERNEL); 298 if (!idev->stats.icmpv6msgdev) 299 goto err_icmpmsg; 300 301 return 0; 302 303 err_icmpmsg: 304 kfree(idev->stats.icmpv6dev); 305 err_icmp: 306 free_percpu(idev->stats.ipv6); 307 err_ip: 308 return -ENOMEM; 309 } 310 311 static struct inet6_dev *ipv6_add_dev(struct net_device *dev) 312 { 313 struct inet6_dev *ndev; 314 int err = -ENOMEM; 315 316 ASSERT_RTNL(); 317 318 if (dev->mtu < IPV6_MIN_MTU) 319 return ERR_PTR(-EINVAL); 320 321 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL); 322 if (ndev == NULL) 323 return ERR_PTR(err); 324 325 rwlock_init(&ndev->lock); 326 ndev->dev = dev; 327 INIT_LIST_HEAD(&ndev->addr_list); 328 setup_timer(&ndev->rs_timer, addrconf_rs_timer, 329 (unsigned long)ndev); 330 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf)); 331 ndev->cnf.mtu6 = dev->mtu; 332 ndev->cnf.sysctl = NULL; 333 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl); 334 if (ndev->nd_parms == NULL) { 335 kfree(ndev); 336 return ERR_PTR(err); 337 } 338 if (ndev->cnf.forwarding) 339 dev_disable_lro(dev); 340 /* We refer to the device */ 341 dev_hold(dev); 342 343 if (snmp6_alloc_dev(ndev) < 0) { 344 ADBG(KERN_WARNING 345 "%s: cannot allocate memory for statistics; dev=%s.\n", 346 __func__, dev->name); 347 neigh_parms_release(&nd_tbl, ndev->nd_parms); 348 dev_put(dev); 349 kfree(ndev); 350 return ERR_PTR(err); 351 } 352 353 if (snmp6_register_dev(ndev) < 0) { 354 ADBG(KERN_WARNING 355 "%s: cannot create /proc/net/dev_snmp6/%s\n", 356 __func__, dev->name); 357 goto err_release; 358 } 359 360 /* One reference from device. We must do this before 361 * we invoke __ipv6_regen_rndid(). 362 */ 363 in6_dev_hold(ndev); 364 365 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK)) 366 ndev->cnf.accept_dad = -1; 367 368 #if IS_ENABLED(CONFIG_IPV6_SIT) 369 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) { 370 pr_info("%s: Disabled Multicast RS\n", dev->name); 371 ndev->cnf.rtr_solicits = 0; 372 } 373 #endif 374 375 INIT_LIST_HEAD(&ndev->tempaddr_list); 376 setup_timer(&ndev->regen_timer, ipv6_regen_rndid, (unsigned long)ndev); 377 if ((dev->flags&IFF_LOOPBACK) || 378 dev->type == ARPHRD_TUNNEL || 379 dev->type == ARPHRD_TUNNEL6 || 380 dev->type == ARPHRD_SIT || 381 dev->type == ARPHRD_NONE) { 382 ndev->cnf.use_tempaddr = -1; 383 } else { 384 in6_dev_hold(ndev); 385 ipv6_regen_rndid((unsigned long) ndev); 386 } 387 388 ndev->token = in6addr_any; 389 390 if (netif_running(dev) && addrconf_qdisc_ok(dev)) 391 ndev->if_flags |= IF_READY; 392 393 ipv6_mc_init_dev(ndev); 394 ndev->tstamp = jiffies; 395 err = addrconf_sysctl_register(ndev); 396 if (err) { 397 ipv6_mc_destroy_dev(ndev); 398 del_timer(&ndev->regen_timer); 399 goto err_release; 400 } 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 err_release: 417 neigh_parms_release(&nd_tbl, ndev->nd_parms); 418 ndev->dead = 1; 419 in6_dev_finish_destroy(ndev); 420 return ERR_PTR(err); 421 } 422 423 static struct inet6_dev *ipv6_find_idev(struct net_device *dev) 424 { 425 struct inet6_dev *idev; 426 427 ASSERT_RTNL(); 428 429 idev = __in6_dev_get(dev); 430 if (!idev) { 431 idev = ipv6_add_dev(dev); 432 if (IS_ERR(idev)) 433 return NULL; 434 } 435 436 if (dev->flags&IFF_UP) 437 ipv6_mc_up(idev); 438 return idev; 439 } 440 441 static int inet6_netconf_msgsize_devconf(int type) 442 { 443 int size = NLMSG_ALIGN(sizeof(struct netconfmsg)) 444 + nla_total_size(4); /* NETCONFA_IFINDEX */ 445 446 /* type -1 is used for ALL */ 447 if (type == -1 || type == NETCONFA_FORWARDING) 448 size += nla_total_size(4); 449 #ifdef CONFIG_IPV6_MROUTE 450 if (type == -1 || type == NETCONFA_MC_FORWARDING) 451 size += nla_total_size(4); 452 #endif 453 if (type == -1 || type == NETCONFA_PROXY_NEIGH) 454 size += nla_total_size(4); 455 456 return size; 457 } 458 459 static int inet6_netconf_fill_devconf(struct sk_buff *skb, int ifindex, 460 struct ipv6_devconf *devconf, u32 portid, 461 u32 seq, int event, unsigned int flags, 462 int type) 463 { 464 struct nlmsghdr *nlh; 465 struct netconfmsg *ncm; 466 467 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg), 468 flags); 469 if (nlh == NULL) 470 return -EMSGSIZE; 471 472 ncm = nlmsg_data(nlh); 473 ncm->ncm_family = AF_INET6; 474 475 if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0) 476 goto nla_put_failure; 477 478 /* type -1 is used for ALL */ 479 if ((type == -1 || type == NETCONFA_FORWARDING) && 480 nla_put_s32(skb, NETCONFA_FORWARDING, devconf->forwarding) < 0) 481 goto nla_put_failure; 482 #ifdef CONFIG_IPV6_MROUTE 483 if ((type == -1 || type == NETCONFA_MC_FORWARDING) && 484 nla_put_s32(skb, NETCONFA_MC_FORWARDING, 485 devconf->mc_forwarding) < 0) 486 goto nla_put_failure; 487 #endif 488 if ((type == -1 || type == NETCONFA_PROXY_NEIGH) && 489 nla_put_s32(skb, NETCONFA_PROXY_NEIGH, devconf->proxy_ndp) < 0) 490 goto nla_put_failure; 491 492 return nlmsg_end(skb, nlh); 493 494 nla_put_failure: 495 nlmsg_cancel(skb, nlh); 496 return -EMSGSIZE; 497 } 498 499 void inet6_netconf_notify_devconf(struct net *net, int type, int ifindex, 500 struct ipv6_devconf *devconf) 501 { 502 struct sk_buff *skb; 503 int err = -ENOBUFS; 504 505 skb = nlmsg_new(inet6_netconf_msgsize_devconf(type), GFP_ATOMIC); 506 if (skb == NULL) 507 goto errout; 508 509 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 0, 0, 510 RTM_NEWNETCONF, 0, type); 511 if (err < 0) { 512 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */ 513 WARN_ON(err == -EMSGSIZE); 514 kfree_skb(skb); 515 goto errout; 516 } 517 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_NETCONF, NULL, GFP_ATOMIC); 518 return; 519 errout: 520 rtnl_set_sk_err(net, RTNLGRP_IPV6_NETCONF, err); 521 } 522 523 static const struct nla_policy devconf_ipv6_policy[NETCONFA_MAX+1] = { 524 [NETCONFA_IFINDEX] = { .len = sizeof(int) }, 525 [NETCONFA_FORWARDING] = { .len = sizeof(int) }, 526 [NETCONFA_PROXY_NEIGH] = { .len = sizeof(int) }, 527 }; 528 529 static int inet6_netconf_get_devconf(struct sk_buff *in_skb, 530 struct nlmsghdr *nlh) 531 { 532 struct net *net = sock_net(in_skb->sk); 533 struct nlattr *tb[NETCONFA_MAX+1]; 534 struct netconfmsg *ncm; 535 struct sk_buff *skb; 536 struct ipv6_devconf *devconf; 537 struct inet6_dev *in6_dev; 538 struct net_device *dev; 539 int ifindex; 540 int err; 541 542 err = nlmsg_parse(nlh, sizeof(*ncm), tb, NETCONFA_MAX, 543 devconf_ipv6_policy); 544 if (err < 0) 545 goto errout; 546 547 err = EINVAL; 548 if (!tb[NETCONFA_IFINDEX]) 549 goto errout; 550 551 ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]); 552 switch (ifindex) { 553 case NETCONFA_IFINDEX_ALL: 554 devconf = net->ipv6.devconf_all; 555 break; 556 case NETCONFA_IFINDEX_DEFAULT: 557 devconf = net->ipv6.devconf_dflt; 558 break; 559 default: 560 dev = __dev_get_by_index(net, ifindex); 561 if (dev == NULL) 562 goto errout; 563 in6_dev = __in6_dev_get(dev); 564 if (in6_dev == NULL) 565 goto errout; 566 devconf = &in6_dev->cnf; 567 break; 568 } 569 570 err = -ENOBUFS; 571 skb = nlmsg_new(inet6_netconf_msgsize_devconf(-1), GFP_ATOMIC); 572 if (skb == NULL) 573 goto errout; 574 575 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 576 NETLINK_CB(in_skb).portid, 577 nlh->nlmsg_seq, RTM_NEWNETCONF, 0, 578 -1); 579 if (err < 0) { 580 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */ 581 WARN_ON(err == -EMSGSIZE); 582 kfree_skb(skb); 583 goto errout; 584 } 585 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid); 586 errout: 587 return err; 588 } 589 590 static int inet6_netconf_dump_devconf(struct sk_buff *skb, 591 struct netlink_callback *cb) 592 { 593 struct net *net = sock_net(skb->sk); 594 int h, s_h; 595 int idx, s_idx; 596 struct net_device *dev; 597 struct inet6_dev *idev; 598 struct hlist_head *head; 599 600 s_h = cb->args[0]; 601 s_idx = idx = cb->args[1]; 602 603 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 604 idx = 0; 605 head = &net->dev_index_head[h]; 606 rcu_read_lock(); 607 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ 608 net->dev_base_seq; 609 hlist_for_each_entry_rcu(dev, head, index_hlist) { 610 if (idx < s_idx) 611 goto cont; 612 idev = __in6_dev_get(dev); 613 if (!idev) 614 goto cont; 615 616 if (inet6_netconf_fill_devconf(skb, dev->ifindex, 617 &idev->cnf, 618 NETLINK_CB(cb->skb).portid, 619 cb->nlh->nlmsg_seq, 620 RTM_NEWNETCONF, 621 NLM_F_MULTI, 622 -1) <= 0) { 623 rcu_read_unlock(); 624 goto done; 625 } 626 nl_dump_check_consistent(cb, nlmsg_hdr(skb)); 627 cont: 628 idx++; 629 } 630 rcu_read_unlock(); 631 } 632 if (h == NETDEV_HASHENTRIES) { 633 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL, 634 net->ipv6.devconf_all, 635 NETLINK_CB(cb->skb).portid, 636 cb->nlh->nlmsg_seq, 637 RTM_NEWNETCONF, NLM_F_MULTI, 638 -1) <= 0) 639 goto done; 640 else 641 h++; 642 } 643 if (h == NETDEV_HASHENTRIES + 1) { 644 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT, 645 net->ipv6.devconf_dflt, 646 NETLINK_CB(cb->skb).portid, 647 cb->nlh->nlmsg_seq, 648 RTM_NEWNETCONF, NLM_F_MULTI, 649 -1) <= 0) 650 goto done; 651 else 652 h++; 653 } 654 done: 655 cb->args[0] = h; 656 cb->args[1] = idx; 657 658 return skb->len; 659 } 660 661 #ifdef CONFIG_SYSCTL 662 static void dev_forward_change(struct inet6_dev *idev) 663 { 664 struct net_device *dev; 665 struct inet6_ifaddr *ifa; 666 667 if (!idev) 668 return; 669 dev = idev->dev; 670 if (idev->cnf.forwarding) 671 dev_disable_lro(dev); 672 if (dev->flags & IFF_MULTICAST) { 673 if (idev->cnf.forwarding) { 674 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters); 675 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allrouters); 676 ipv6_dev_mc_inc(dev, &in6addr_sitelocal_allrouters); 677 } else { 678 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters); 679 ipv6_dev_mc_dec(dev, &in6addr_interfacelocal_allrouters); 680 ipv6_dev_mc_dec(dev, &in6addr_sitelocal_allrouters); 681 } 682 } 683 684 list_for_each_entry(ifa, &idev->addr_list, if_list) { 685 if (ifa->flags&IFA_F_TENTATIVE) 686 continue; 687 if (idev->cnf.forwarding) 688 addrconf_join_anycast(ifa); 689 else 690 addrconf_leave_anycast(ifa); 691 } 692 inet6_netconf_notify_devconf(dev_net(dev), NETCONFA_FORWARDING, 693 dev->ifindex, &idev->cnf); 694 } 695 696 697 static void addrconf_forward_change(struct net *net, __s32 newf) 698 { 699 struct net_device *dev; 700 struct inet6_dev *idev; 701 702 for_each_netdev(net, dev) { 703 idev = __in6_dev_get(dev); 704 if (idev) { 705 int changed = (!idev->cnf.forwarding) ^ (!newf); 706 idev->cnf.forwarding = newf; 707 if (changed) 708 dev_forward_change(idev); 709 } 710 } 711 } 712 713 static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf) 714 { 715 struct net *net; 716 int old; 717 718 if (!rtnl_trylock()) 719 return restart_syscall(); 720 721 net = (struct net *)table->extra2; 722 old = *p; 723 *p = newf; 724 725 if (p == &net->ipv6.devconf_dflt->forwarding) { 726 if ((!newf) ^ (!old)) 727 inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING, 728 NETCONFA_IFINDEX_DEFAULT, 729 net->ipv6.devconf_dflt); 730 rtnl_unlock(); 731 return 0; 732 } 733 734 if (p == &net->ipv6.devconf_all->forwarding) { 735 net->ipv6.devconf_dflt->forwarding = newf; 736 addrconf_forward_change(net, newf); 737 if ((!newf) ^ (!old)) 738 inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING, 739 NETCONFA_IFINDEX_ALL, 740 net->ipv6.devconf_all); 741 } else if ((!newf) ^ (!old)) 742 dev_forward_change((struct inet6_dev *)table->extra1); 743 rtnl_unlock(); 744 745 if (newf) 746 rt6_purge_dflt_routers(net); 747 return 1; 748 } 749 #endif 750 751 /* Nobody refers to this ifaddr, destroy it */ 752 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp) 753 { 754 WARN_ON(!hlist_unhashed(&ifp->addr_lst)); 755 756 #ifdef NET_REFCNT_DEBUG 757 pr_debug("%s\n", __func__); 758 #endif 759 760 in6_dev_put(ifp->idev); 761 762 if (cancel_delayed_work(&ifp->dad_work)) 763 pr_notice("delayed DAD work was pending while freeing ifa=%p\n", 764 ifp); 765 766 if (ifp->state != INET6_IFADDR_STATE_DEAD) { 767 pr_warn("Freeing alive inet6 address %p\n", ifp); 768 return; 769 } 770 ip6_rt_put(ifp->rt); 771 772 kfree_rcu(ifp, rcu); 773 } 774 775 static void 776 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp) 777 { 778 struct list_head *p; 779 int ifp_scope = ipv6_addr_src_scope(&ifp->addr); 780 781 /* 782 * Each device address list is sorted in order of scope - 783 * global before linklocal. 784 */ 785 list_for_each(p, &idev->addr_list) { 786 struct inet6_ifaddr *ifa 787 = list_entry(p, struct inet6_ifaddr, if_list); 788 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr)) 789 break; 790 } 791 792 list_add_tail(&ifp->if_list, p); 793 } 794 795 static u32 inet6_addr_hash(const struct in6_addr *addr) 796 { 797 return hash_32(ipv6_addr_hash(addr), IN6_ADDR_HSIZE_SHIFT); 798 } 799 800 /* On success it returns ifp with increased reference count */ 801 802 static struct inet6_ifaddr * 803 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, 804 const struct in6_addr *peer_addr, int pfxlen, 805 int scope, u32 flags, u32 valid_lft, u32 prefered_lft) 806 { 807 struct inet6_ifaddr *ifa = NULL; 808 struct rt6_info *rt; 809 unsigned int hash; 810 int err = 0; 811 int addr_type = ipv6_addr_type(addr); 812 813 if (addr_type == IPV6_ADDR_ANY || 814 addr_type & IPV6_ADDR_MULTICAST || 815 (!(idev->dev->flags & IFF_LOOPBACK) && 816 addr_type & IPV6_ADDR_LOOPBACK)) 817 return ERR_PTR(-EADDRNOTAVAIL); 818 819 rcu_read_lock_bh(); 820 if (idev->dead) { 821 err = -ENODEV; /*XXX*/ 822 goto out2; 823 } 824 825 if (idev->cnf.disable_ipv6) { 826 err = -EACCES; 827 goto out2; 828 } 829 830 spin_lock(&addrconf_hash_lock); 831 832 /* Ignore adding duplicate addresses on an interface */ 833 if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) { 834 ADBG("ipv6_add_addr: already assigned\n"); 835 err = -EEXIST; 836 goto out; 837 } 838 839 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC); 840 841 if (ifa == NULL) { 842 ADBG("ipv6_add_addr: malloc failed\n"); 843 err = -ENOBUFS; 844 goto out; 845 } 846 847 rt = addrconf_dst_alloc(idev, addr, false); 848 if (IS_ERR(rt)) { 849 err = PTR_ERR(rt); 850 goto out; 851 } 852 853 neigh_parms_data_state_setall(idev->nd_parms); 854 855 ifa->addr = *addr; 856 if (peer_addr) 857 ifa->peer_addr = *peer_addr; 858 859 spin_lock_init(&ifa->lock); 860 spin_lock_init(&ifa->state_lock); 861 INIT_DELAYED_WORK(&ifa->dad_work, addrconf_dad_work); 862 INIT_HLIST_NODE(&ifa->addr_lst); 863 ifa->scope = scope; 864 ifa->prefix_len = pfxlen; 865 ifa->flags = flags | IFA_F_TENTATIVE; 866 ifa->valid_lft = valid_lft; 867 ifa->prefered_lft = prefered_lft; 868 ifa->cstamp = ifa->tstamp = jiffies; 869 ifa->tokenized = false; 870 871 ifa->rt = rt; 872 873 ifa->idev = idev; 874 in6_dev_hold(idev); 875 /* For caller */ 876 in6_ifa_hold(ifa); 877 878 /* Add to big hash table */ 879 hash = inet6_addr_hash(addr); 880 881 hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]); 882 spin_unlock(&addrconf_hash_lock); 883 884 write_lock(&idev->lock); 885 /* Add to inet6_dev unicast addr list. */ 886 ipv6_link_dev_addr(idev, ifa); 887 888 if (ifa->flags&IFA_F_TEMPORARY) { 889 list_add(&ifa->tmp_list, &idev->tempaddr_list); 890 in6_ifa_hold(ifa); 891 } 892 893 in6_ifa_hold(ifa); 894 write_unlock(&idev->lock); 895 out2: 896 rcu_read_unlock_bh(); 897 898 if (likely(err == 0)) 899 inet6addr_notifier_call_chain(NETDEV_UP, ifa); 900 else { 901 kfree(ifa); 902 ifa = ERR_PTR(err); 903 } 904 905 return ifa; 906 out: 907 spin_unlock(&addrconf_hash_lock); 908 goto out2; 909 } 910 911 enum cleanup_prefix_rt_t { 912 CLEANUP_PREFIX_RT_NOP, /* no cleanup action for prefix route */ 913 CLEANUP_PREFIX_RT_DEL, /* delete the prefix route */ 914 CLEANUP_PREFIX_RT_EXPIRE, /* update the lifetime of the prefix route */ 915 }; 916 917 /* 918 * Check, whether the prefix for ifp would still need a prefix route 919 * after deleting ifp. The function returns one of the CLEANUP_PREFIX_RT_* 920 * constants. 921 * 922 * 1) we don't purge prefix if address was not permanent. 923 * prefix is managed by its own lifetime. 924 * 2) we also don't purge, if the address was IFA_F_NOPREFIXROUTE. 925 * 3) if there are no addresses, delete prefix. 926 * 4) if there are still other permanent address(es), 927 * corresponding prefix is still permanent. 928 * 5) if there are still other addresses with IFA_F_NOPREFIXROUTE, 929 * don't purge the prefix, assume user space is managing it. 930 * 6) otherwise, update prefix lifetime to the 931 * longest valid lifetime among the corresponding 932 * addresses on the device. 933 * Note: subsequent RA will update lifetime. 934 **/ 935 static enum cleanup_prefix_rt_t 936 check_cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long *expires) 937 { 938 struct inet6_ifaddr *ifa; 939 struct inet6_dev *idev = ifp->idev; 940 unsigned long lifetime; 941 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_DEL; 942 943 *expires = jiffies; 944 945 list_for_each_entry(ifa, &idev->addr_list, if_list) { 946 if (ifa == ifp) 947 continue; 948 if (!ipv6_prefix_equal(&ifa->addr, &ifp->addr, 949 ifp->prefix_len)) 950 continue; 951 if (ifa->flags & (IFA_F_PERMANENT | IFA_F_NOPREFIXROUTE)) 952 return CLEANUP_PREFIX_RT_NOP; 953 954 action = CLEANUP_PREFIX_RT_EXPIRE; 955 956 spin_lock(&ifa->lock); 957 958 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ); 959 /* 960 * Note: Because this address is 961 * not permanent, lifetime < 962 * LONG_MAX / HZ here. 963 */ 964 if (time_before(*expires, ifa->tstamp + lifetime * HZ)) 965 *expires = ifa->tstamp + lifetime * HZ; 966 spin_unlock(&ifa->lock); 967 } 968 969 return action; 970 } 971 972 static void 973 cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long expires, bool del_rt) 974 { 975 struct rt6_info *rt; 976 977 rt = addrconf_get_prefix_route(&ifp->addr, 978 ifp->prefix_len, 979 ifp->idev->dev, 980 0, RTF_GATEWAY | RTF_DEFAULT); 981 if (rt) { 982 if (del_rt) 983 ip6_del_rt(rt); 984 else { 985 if (!(rt->rt6i_flags & RTF_EXPIRES)) 986 rt6_set_expires(rt, expires); 987 ip6_rt_put(rt); 988 } 989 } 990 } 991 992 993 /* This function wants to get referenced ifp and releases it before return */ 994 995 static void ipv6_del_addr(struct inet6_ifaddr *ifp) 996 { 997 int state; 998 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_NOP; 999 unsigned long expires; 1000 1001 ASSERT_RTNL(); 1002 1003 spin_lock_bh(&ifp->state_lock); 1004 state = ifp->state; 1005 ifp->state = INET6_IFADDR_STATE_DEAD; 1006 spin_unlock_bh(&ifp->state_lock); 1007 1008 if (state == INET6_IFADDR_STATE_DEAD) 1009 goto out; 1010 1011 spin_lock_bh(&addrconf_hash_lock); 1012 hlist_del_init_rcu(&ifp->addr_lst); 1013 spin_unlock_bh(&addrconf_hash_lock); 1014 1015 write_lock_bh(&ifp->idev->lock); 1016 1017 if (ifp->flags&IFA_F_TEMPORARY) { 1018 list_del(&ifp->tmp_list); 1019 if (ifp->ifpub) { 1020 in6_ifa_put(ifp->ifpub); 1021 ifp->ifpub = NULL; 1022 } 1023 __in6_ifa_put(ifp); 1024 } 1025 1026 if (ifp->flags & IFA_F_PERMANENT && !(ifp->flags & IFA_F_NOPREFIXROUTE)) 1027 action = check_cleanup_prefix_route(ifp, &expires); 1028 1029 list_del_init(&ifp->if_list); 1030 __in6_ifa_put(ifp); 1031 1032 write_unlock_bh(&ifp->idev->lock); 1033 1034 addrconf_del_dad_work(ifp); 1035 1036 ipv6_ifa_notify(RTM_DELADDR, ifp); 1037 1038 inet6addr_notifier_call_chain(NETDEV_DOWN, ifp); 1039 1040 if (action != CLEANUP_PREFIX_RT_NOP) { 1041 cleanup_prefix_route(ifp, expires, 1042 action == CLEANUP_PREFIX_RT_DEL); 1043 } 1044 1045 /* clean up prefsrc entries */ 1046 rt6_remove_prefsrc(ifp); 1047 out: 1048 in6_ifa_put(ifp); 1049 } 1050 1051 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift) 1052 { 1053 struct inet6_dev *idev = ifp->idev; 1054 struct in6_addr addr, *tmpaddr; 1055 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_tstamp, age; 1056 unsigned long regen_advance; 1057 int tmp_plen; 1058 int ret = 0; 1059 u32 addr_flags; 1060 unsigned long now = jiffies; 1061 1062 write_lock_bh(&idev->lock); 1063 if (ift) { 1064 spin_lock_bh(&ift->lock); 1065 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8); 1066 spin_unlock_bh(&ift->lock); 1067 tmpaddr = &addr; 1068 } else { 1069 tmpaddr = NULL; 1070 } 1071 retry: 1072 in6_dev_hold(idev); 1073 if (idev->cnf.use_tempaddr <= 0) { 1074 write_unlock_bh(&idev->lock); 1075 pr_info("%s: use_tempaddr is disabled\n", __func__); 1076 in6_dev_put(idev); 1077 ret = -1; 1078 goto out; 1079 } 1080 spin_lock_bh(&ifp->lock); 1081 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) { 1082 idev->cnf.use_tempaddr = -1; /*XXX*/ 1083 spin_unlock_bh(&ifp->lock); 1084 write_unlock_bh(&idev->lock); 1085 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n", 1086 __func__); 1087 in6_dev_put(idev); 1088 ret = -1; 1089 goto out; 1090 } 1091 in6_ifa_hold(ifp); 1092 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8); 1093 __ipv6_try_regen_rndid(idev, tmpaddr); 1094 memcpy(&addr.s6_addr[8], idev->rndid, 8); 1095 age = (now - ifp->tstamp) / HZ; 1096 tmp_valid_lft = min_t(__u32, 1097 ifp->valid_lft, 1098 idev->cnf.temp_valid_lft + age); 1099 tmp_prefered_lft = min_t(__u32, 1100 ifp->prefered_lft, 1101 idev->cnf.temp_prefered_lft + age - 1102 idev->cnf.max_desync_factor); 1103 tmp_plen = ifp->prefix_len; 1104 tmp_tstamp = ifp->tstamp; 1105 spin_unlock_bh(&ifp->lock); 1106 1107 regen_advance = idev->cnf.regen_max_retry * 1108 idev->cnf.dad_transmits * 1109 NEIGH_VAR(idev->nd_parms, RETRANS_TIME) / HZ; 1110 write_unlock_bh(&idev->lock); 1111 1112 /* A temporary address is created only if this calculated Preferred 1113 * Lifetime is greater than REGEN_ADVANCE time units. In particular, 1114 * an implementation must not create a temporary address with a zero 1115 * Preferred Lifetime. 1116 * Use age calculation as in addrconf_verify to avoid unnecessary 1117 * temporary addresses being generated. 1118 */ 1119 age = (now - tmp_tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ; 1120 if (tmp_prefered_lft <= regen_advance + age) { 1121 in6_ifa_put(ifp); 1122 in6_dev_put(idev); 1123 ret = -1; 1124 goto out; 1125 } 1126 1127 addr_flags = IFA_F_TEMPORARY; 1128 /* set in addrconf_prefix_rcv() */ 1129 if (ifp->flags & IFA_F_OPTIMISTIC) 1130 addr_flags |= IFA_F_OPTIMISTIC; 1131 1132 ift = ipv6_add_addr(idev, &addr, NULL, tmp_plen, 1133 ipv6_addr_scope(&addr), addr_flags, 1134 tmp_valid_lft, tmp_prefered_lft); 1135 if (IS_ERR(ift)) { 1136 in6_ifa_put(ifp); 1137 in6_dev_put(idev); 1138 pr_info("%s: retry temporary address regeneration\n", __func__); 1139 tmpaddr = &addr; 1140 write_lock_bh(&idev->lock); 1141 goto retry; 1142 } 1143 1144 spin_lock_bh(&ift->lock); 1145 ift->ifpub = ifp; 1146 ift->cstamp = now; 1147 ift->tstamp = tmp_tstamp; 1148 spin_unlock_bh(&ift->lock); 1149 1150 addrconf_dad_start(ift); 1151 in6_ifa_put(ift); 1152 in6_dev_put(idev); 1153 out: 1154 return ret; 1155 } 1156 1157 /* 1158 * Choose an appropriate source address (RFC3484) 1159 */ 1160 enum { 1161 IPV6_SADDR_RULE_INIT = 0, 1162 IPV6_SADDR_RULE_LOCAL, 1163 IPV6_SADDR_RULE_SCOPE, 1164 IPV6_SADDR_RULE_PREFERRED, 1165 #ifdef CONFIG_IPV6_MIP6 1166 IPV6_SADDR_RULE_HOA, 1167 #endif 1168 IPV6_SADDR_RULE_OIF, 1169 IPV6_SADDR_RULE_LABEL, 1170 IPV6_SADDR_RULE_PRIVACY, 1171 IPV6_SADDR_RULE_ORCHID, 1172 IPV6_SADDR_RULE_PREFIX, 1173 IPV6_SADDR_RULE_MAX 1174 }; 1175 1176 struct ipv6_saddr_score { 1177 int rule; 1178 int addr_type; 1179 struct inet6_ifaddr *ifa; 1180 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX); 1181 int scopedist; 1182 int matchlen; 1183 }; 1184 1185 struct ipv6_saddr_dst { 1186 const struct in6_addr *addr; 1187 int ifindex; 1188 int scope; 1189 int label; 1190 unsigned int prefs; 1191 }; 1192 1193 static inline int ipv6_saddr_preferred(int type) 1194 { 1195 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK)) 1196 return 1; 1197 return 0; 1198 } 1199 1200 static int ipv6_get_saddr_eval(struct net *net, 1201 struct ipv6_saddr_score *score, 1202 struct ipv6_saddr_dst *dst, 1203 int i) 1204 { 1205 int ret; 1206 1207 if (i <= score->rule) { 1208 switch (i) { 1209 case IPV6_SADDR_RULE_SCOPE: 1210 ret = score->scopedist; 1211 break; 1212 case IPV6_SADDR_RULE_PREFIX: 1213 ret = score->matchlen; 1214 break; 1215 default: 1216 ret = !!test_bit(i, score->scorebits); 1217 } 1218 goto out; 1219 } 1220 1221 switch (i) { 1222 case IPV6_SADDR_RULE_INIT: 1223 /* Rule 0: remember if hiscore is not ready yet */ 1224 ret = !!score->ifa; 1225 break; 1226 case IPV6_SADDR_RULE_LOCAL: 1227 /* Rule 1: Prefer same address */ 1228 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr); 1229 break; 1230 case IPV6_SADDR_RULE_SCOPE: 1231 /* Rule 2: Prefer appropriate scope 1232 * 1233 * ret 1234 * ^ 1235 * -1 | d 15 1236 * ---+--+-+---> scope 1237 * | 1238 * | d is scope of the destination. 1239 * B-d | \ 1240 * | \ <- smaller scope is better if 1241 * B-15 | \ if scope is enough for destination. 1242 * | ret = B - scope (-1 <= scope >= d <= 15). 1243 * d-C-1 | / 1244 * |/ <- greater is better 1245 * -C / if scope is not enough for destination. 1246 * /| ret = scope - C (-1 <= d < scope <= 15). 1247 * 1248 * d - C - 1 < B -15 (for all -1 <= d <= 15). 1249 * C > d + 14 - B >= 15 + 14 - B = 29 - B. 1250 * Assume B = 0 and we get C > 29. 1251 */ 1252 ret = __ipv6_addr_src_scope(score->addr_type); 1253 if (ret >= dst->scope) 1254 ret = -ret; 1255 else 1256 ret -= 128; /* 30 is enough */ 1257 score->scopedist = ret; 1258 break; 1259 case IPV6_SADDR_RULE_PREFERRED: 1260 /* Rule 3: Avoid deprecated and optimistic addresses */ 1261 ret = ipv6_saddr_preferred(score->addr_type) || 1262 !(score->ifa->flags & (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC)); 1263 break; 1264 #ifdef CONFIG_IPV6_MIP6 1265 case IPV6_SADDR_RULE_HOA: 1266 { 1267 /* Rule 4: Prefer home address */ 1268 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA); 1269 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome; 1270 break; 1271 } 1272 #endif 1273 case IPV6_SADDR_RULE_OIF: 1274 /* Rule 5: Prefer outgoing interface */ 1275 ret = (!dst->ifindex || 1276 dst->ifindex == score->ifa->idev->dev->ifindex); 1277 break; 1278 case IPV6_SADDR_RULE_LABEL: 1279 /* Rule 6: Prefer matching label */ 1280 ret = ipv6_addr_label(net, 1281 &score->ifa->addr, score->addr_type, 1282 score->ifa->idev->dev->ifindex) == dst->label; 1283 break; 1284 case IPV6_SADDR_RULE_PRIVACY: 1285 { 1286 /* Rule 7: Prefer public address 1287 * Note: prefer temporary address if use_tempaddr >= 2 1288 */ 1289 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ? 1290 !!(dst->prefs & IPV6_PREFER_SRC_TMP) : 1291 score->ifa->idev->cnf.use_tempaddr >= 2; 1292 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp; 1293 break; 1294 } 1295 case IPV6_SADDR_RULE_ORCHID: 1296 /* Rule 8-: Prefer ORCHID vs ORCHID or 1297 * non-ORCHID vs non-ORCHID 1298 */ 1299 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^ 1300 ipv6_addr_orchid(dst->addr)); 1301 break; 1302 case IPV6_SADDR_RULE_PREFIX: 1303 /* Rule 8: Use longest matching prefix */ 1304 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr); 1305 if (ret > score->ifa->prefix_len) 1306 ret = score->ifa->prefix_len; 1307 score->matchlen = ret; 1308 break; 1309 default: 1310 ret = 0; 1311 } 1312 1313 if (ret) 1314 __set_bit(i, score->scorebits); 1315 score->rule = i; 1316 out: 1317 return ret; 1318 } 1319 1320 int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev, 1321 const struct in6_addr *daddr, unsigned int prefs, 1322 struct in6_addr *saddr) 1323 { 1324 struct ipv6_saddr_score scores[2], 1325 *score = &scores[0], *hiscore = &scores[1]; 1326 struct ipv6_saddr_dst dst; 1327 struct net_device *dev; 1328 int dst_type; 1329 1330 dst_type = __ipv6_addr_type(daddr); 1331 dst.addr = daddr; 1332 dst.ifindex = dst_dev ? dst_dev->ifindex : 0; 1333 dst.scope = __ipv6_addr_src_scope(dst_type); 1334 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex); 1335 dst.prefs = prefs; 1336 1337 hiscore->rule = -1; 1338 hiscore->ifa = NULL; 1339 1340 rcu_read_lock(); 1341 1342 for_each_netdev_rcu(net, dev) { 1343 struct inet6_dev *idev; 1344 1345 /* Candidate Source Address (section 4) 1346 * - multicast and link-local destination address, 1347 * the set of candidate source address MUST only 1348 * include addresses assigned to interfaces 1349 * belonging to the same link as the outgoing 1350 * interface. 1351 * (- For site-local destination addresses, the 1352 * set of candidate source addresses MUST only 1353 * include addresses assigned to interfaces 1354 * belonging to the same site as the outgoing 1355 * interface.) 1356 */ 1357 if (((dst_type & IPV6_ADDR_MULTICAST) || 1358 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL) && 1359 dst.ifindex && dev->ifindex != dst.ifindex) 1360 continue; 1361 1362 idev = __in6_dev_get(dev); 1363 if (!idev) 1364 continue; 1365 1366 read_lock_bh(&idev->lock); 1367 list_for_each_entry(score->ifa, &idev->addr_list, if_list) { 1368 int i; 1369 1370 /* 1371 * - Tentative Address (RFC2462 section 5.4) 1372 * - A tentative address is not considered 1373 * "assigned to an interface" in the traditional 1374 * sense, unless it is also flagged as optimistic. 1375 * - Candidate Source Address (section 4) 1376 * - In any case, anycast addresses, multicast 1377 * addresses, and the unspecified address MUST 1378 * NOT be included in a candidate set. 1379 */ 1380 if ((score->ifa->flags & IFA_F_TENTATIVE) && 1381 (!(score->ifa->flags & IFA_F_OPTIMISTIC))) 1382 continue; 1383 1384 score->addr_type = __ipv6_addr_type(&score->ifa->addr); 1385 1386 if (unlikely(score->addr_type == IPV6_ADDR_ANY || 1387 score->addr_type & IPV6_ADDR_MULTICAST)) { 1388 LIMIT_NETDEBUG(KERN_DEBUG 1389 "ADDRCONF: unspecified / multicast address " 1390 "assigned as unicast address on %s", 1391 dev->name); 1392 continue; 1393 } 1394 1395 score->rule = -1; 1396 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX); 1397 1398 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) { 1399 int minihiscore, miniscore; 1400 1401 minihiscore = ipv6_get_saddr_eval(net, hiscore, &dst, i); 1402 miniscore = ipv6_get_saddr_eval(net, score, &dst, i); 1403 1404 if (minihiscore > miniscore) { 1405 if (i == IPV6_SADDR_RULE_SCOPE && 1406 score->scopedist > 0) { 1407 /* 1408 * special case: 1409 * each remaining entry 1410 * has too small (not enough) 1411 * scope, because ifa entries 1412 * are sorted by their scope 1413 * values. 1414 */ 1415 goto try_nextdev; 1416 } 1417 break; 1418 } else if (minihiscore < miniscore) { 1419 if (hiscore->ifa) 1420 in6_ifa_put(hiscore->ifa); 1421 1422 in6_ifa_hold(score->ifa); 1423 1424 swap(hiscore, score); 1425 1426 /* restore our iterator */ 1427 score->ifa = hiscore->ifa; 1428 1429 break; 1430 } 1431 } 1432 } 1433 try_nextdev: 1434 read_unlock_bh(&idev->lock); 1435 } 1436 rcu_read_unlock(); 1437 1438 if (!hiscore->ifa) 1439 return -EADDRNOTAVAIL; 1440 1441 *saddr = hiscore->ifa->addr; 1442 in6_ifa_put(hiscore->ifa); 1443 return 0; 1444 } 1445 EXPORT_SYMBOL(ipv6_dev_get_saddr); 1446 1447 int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr, 1448 u32 banned_flags) 1449 { 1450 struct inet6_ifaddr *ifp; 1451 int err = -EADDRNOTAVAIL; 1452 1453 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) { 1454 if (ifp->scope > IFA_LINK) 1455 break; 1456 if (ifp->scope == IFA_LINK && 1457 !(ifp->flags & banned_flags)) { 1458 *addr = ifp->addr; 1459 err = 0; 1460 break; 1461 } 1462 } 1463 return err; 1464 } 1465 1466 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr, 1467 u32 banned_flags) 1468 { 1469 struct inet6_dev *idev; 1470 int err = -EADDRNOTAVAIL; 1471 1472 rcu_read_lock(); 1473 idev = __in6_dev_get(dev); 1474 if (idev) { 1475 read_lock_bh(&idev->lock); 1476 err = __ipv6_get_lladdr(idev, addr, banned_flags); 1477 read_unlock_bh(&idev->lock); 1478 } 1479 rcu_read_unlock(); 1480 return err; 1481 } 1482 1483 static int ipv6_count_addresses(struct inet6_dev *idev) 1484 { 1485 int cnt = 0; 1486 struct inet6_ifaddr *ifp; 1487 1488 read_lock_bh(&idev->lock); 1489 list_for_each_entry(ifp, &idev->addr_list, if_list) 1490 cnt++; 1491 read_unlock_bh(&idev->lock); 1492 return cnt; 1493 } 1494 1495 int ipv6_chk_addr(struct net *net, const struct in6_addr *addr, 1496 const struct net_device *dev, int strict) 1497 { 1498 struct inet6_ifaddr *ifp; 1499 unsigned int hash = inet6_addr_hash(addr); 1500 1501 rcu_read_lock_bh(); 1502 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) { 1503 if (!net_eq(dev_net(ifp->idev->dev), net)) 1504 continue; 1505 if (ipv6_addr_equal(&ifp->addr, addr) && 1506 !(ifp->flags&IFA_F_TENTATIVE) && 1507 (dev == NULL || ifp->idev->dev == dev || 1508 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) { 1509 rcu_read_unlock_bh(); 1510 return 1; 1511 } 1512 } 1513 1514 rcu_read_unlock_bh(); 1515 return 0; 1516 } 1517 EXPORT_SYMBOL(ipv6_chk_addr); 1518 1519 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr, 1520 struct net_device *dev) 1521 { 1522 unsigned int hash = inet6_addr_hash(addr); 1523 struct inet6_ifaddr *ifp; 1524 1525 hlist_for_each_entry(ifp, &inet6_addr_lst[hash], addr_lst) { 1526 if (!net_eq(dev_net(ifp->idev->dev), net)) 1527 continue; 1528 if (ipv6_addr_equal(&ifp->addr, addr)) { 1529 if (dev == NULL || ifp->idev->dev == dev) 1530 return true; 1531 } 1532 } 1533 return false; 1534 } 1535 1536 /* Compares an address/prefix_len with addresses on device @dev. 1537 * If one is found it returns true. 1538 */ 1539 bool ipv6_chk_custom_prefix(const struct in6_addr *addr, 1540 const unsigned int prefix_len, struct net_device *dev) 1541 { 1542 struct inet6_dev *idev; 1543 struct inet6_ifaddr *ifa; 1544 bool ret = false; 1545 1546 rcu_read_lock(); 1547 idev = __in6_dev_get(dev); 1548 if (idev) { 1549 read_lock_bh(&idev->lock); 1550 list_for_each_entry(ifa, &idev->addr_list, if_list) { 1551 ret = ipv6_prefix_equal(addr, &ifa->addr, prefix_len); 1552 if (ret) 1553 break; 1554 } 1555 read_unlock_bh(&idev->lock); 1556 } 1557 rcu_read_unlock(); 1558 1559 return ret; 1560 } 1561 EXPORT_SYMBOL(ipv6_chk_custom_prefix); 1562 1563 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev) 1564 { 1565 struct inet6_dev *idev; 1566 struct inet6_ifaddr *ifa; 1567 int onlink; 1568 1569 onlink = 0; 1570 rcu_read_lock(); 1571 idev = __in6_dev_get(dev); 1572 if (idev) { 1573 read_lock_bh(&idev->lock); 1574 list_for_each_entry(ifa, &idev->addr_list, if_list) { 1575 onlink = ipv6_prefix_equal(addr, &ifa->addr, 1576 ifa->prefix_len); 1577 if (onlink) 1578 break; 1579 } 1580 read_unlock_bh(&idev->lock); 1581 } 1582 rcu_read_unlock(); 1583 return onlink; 1584 } 1585 EXPORT_SYMBOL(ipv6_chk_prefix); 1586 1587 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr, 1588 struct net_device *dev, int strict) 1589 { 1590 struct inet6_ifaddr *ifp, *result = NULL; 1591 unsigned int hash = inet6_addr_hash(addr); 1592 1593 rcu_read_lock_bh(); 1594 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) { 1595 if (!net_eq(dev_net(ifp->idev->dev), net)) 1596 continue; 1597 if (ipv6_addr_equal(&ifp->addr, addr)) { 1598 if (dev == NULL || ifp->idev->dev == dev || 1599 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) { 1600 result = ifp; 1601 in6_ifa_hold(ifp); 1602 break; 1603 } 1604 } 1605 } 1606 rcu_read_unlock_bh(); 1607 1608 return result; 1609 } 1610 1611 /* Gets referenced address, destroys ifaddr */ 1612 1613 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed) 1614 { 1615 if (ifp->flags&IFA_F_PERMANENT) { 1616 spin_lock_bh(&ifp->lock); 1617 addrconf_del_dad_work(ifp); 1618 ifp->flags |= IFA_F_TENTATIVE; 1619 if (dad_failed) 1620 ifp->flags |= IFA_F_DADFAILED; 1621 spin_unlock_bh(&ifp->lock); 1622 if (dad_failed) 1623 ipv6_ifa_notify(0, ifp); 1624 in6_ifa_put(ifp); 1625 } else if (ifp->flags&IFA_F_TEMPORARY) { 1626 struct inet6_ifaddr *ifpub; 1627 spin_lock_bh(&ifp->lock); 1628 ifpub = ifp->ifpub; 1629 if (ifpub) { 1630 in6_ifa_hold(ifpub); 1631 spin_unlock_bh(&ifp->lock); 1632 ipv6_create_tempaddr(ifpub, ifp); 1633 in6_ifa_put(ifpub); 1634 } else { 1635 spin_unlock_bh(&ifp->lock); 1636 } 1637 ipv6_del_addr(ifp); 1638 } else { 1639 ipv6_del_addr(ifp); 1640 } 1641 } 1642 1643 static int addrconf_dad_end(struct inet6_ifaddr *ifp) 1644 { 1645 int err = -ENOENT; 1646 1647 spin_lock_bh(&ifp->state_lock); 1648 if (ifp->state == INET6_IFADDR_STATE_DAD) { 1649 ifp->state = INET6_IFADDR_STATE_POSTDAD; 1650 err = 0; 1651 } 1652 spin_unlock_bh(&ifp->state_lock); 1653 1654 return err; 1655 } 1656 1657 void addrconf_dad_failure(struct inet6_ifaddr *ifp) 1658 { 1659 struct inet6_dev *idev = ifp->idev; 1660 1661 if (addrconf_dad_end(ifp)) { 1662 in6_ifa_put(ifp); 1663 return; 1664 } 1665 1666 net_info_ratelimited("%s: IPv6 duplicate address %pI6c detected!\n", 1667 ifp->idev->dev->name, &ifp->addr); 1668 1669 if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6) { 1670 struct in6_addr addr; 1671 1672 addr.s6_addr32[0] = htonl(0xfe800000); 1673 addr.s6_addr32[1] = 0; 1674 1675 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) && 1676 ipv6_addr_equal(&ifp->addr, &addr)) { 1677 /* DAD failed for link-local based on MAC address */ 1678 idev->cnf.disable_ipv6 = 1; 1679 1680 pr_info("%s: IPv6 being disabled!\n", 1681 ifp->idev->dev->name); 1682 } 1683 } 1684 1685 spin_lock_bh(&ifp->state_lock); 1686 /* transition from _POSTDAD to _ERRDAD */ 1687 ifp->state = INET6_IFADDR_STATE_ERRDAD; 1688 spin_unlock_bh(&ifp->state_lock); 1689 1690 addrconf_mod_dad_work(ifp, 0); 1691 } 1692 1693 /* Join to solicited addr multicast group. 1694 * caller must hold RTNL */ 1695 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr) 1696 { 1697 struct in6_addr maddr; 1698 1699 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP)) 1700 return; 1701 1702 addrconf_addr_solict_mult(addr, &maddr); 1703 ipv6_dev_mc_inc(dev, &maddr); 1704 } 1705 1706 /* caller must hold RTNL */ 1707 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr) 1708 { 1709 struct in6_addr maddr; 1710 1711 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP)) 1712 return; 1713 1714 addrconf_addr_solict_mult(addr, &maddr); 1715 __ipv6_dev_mc_dec(idev, &maddr); 1716 } 1717 1718 /* caller must hold RTNL */ 1719 static void addrconf_join_anycast(struct inet6_ifaddr *ifp) 1720 { 1721 struct in6_addr addr; 1722 1723 if (ifp->prefix_len >= 127) /* RFC 6164 */ 1724 return; 1725 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len); 1726 if (ipv6_addr_any(&addr)) 1727 return; 1728 ipv6_dev_ac_inc(ifp->idev->dev, &addr); 1729 } 1730 1731 /* caller must hold RTNL */ 1732 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp) 1733 { 1734 struct in6_addr addr; 1735 1736 if (ifp->prefix_len >= 127) /* RFC 6164 */ 1737 return; 1738 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len); 1739 if (ipv6_addr_any(&addr)) 1740 return; 1741 __ipv6_dev_ac_dec(ifp->idev, &addr); 1742 } 1743 1744 static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev) 1745 { 1746 if (dev->addr_len != ETH_ALEN) 1747 return -1; 1748 memcpy(eui, dev->dev_addr, 3); 1749 memcpy(eui + 5, dev->dev_addr + 3, 3); 1750 1751 /* 1752 * The zSeries OSA network cards can be shared among various 1753 * OS instances, but the OSA cards have only one MAC address. 1754 * This leads to duplicate address conflicts in conjunction 1755 * with IPv6 if more than one instance uses the same card. 1756 * 1757 * The driver for these cards can deliver a unique 16-bit 1758 * identifier for each instance sharing the same card. It is 1759 * placed instead of 0xFFFE in the interface identifier. The 1760 * "u" bit of the interface identifier is not inverted in this 1761 * case. Hence the resulting interface identifier has local 1762 * scope according to RFC2373. 1763 */ 1764 if (dev->dev_id) { 1765 eui[3] = (dev->dev_id >> 8) & 0xFF; 1766 eui[4] = dev->dev_id & 0xFF; 1767 } else { 1768 eui[3] = 0xFF; 1769 eui[4] = 0xFE; 1770 eui[0] ^= 2; 1771 } 1772 return 0; 1773 } 1774 1775 static int addrconf_ifid_eui64(u8 *eui, struct net_device *dev) 1776 { 1777 if (dev->addr_len != IEEE802154_ADDR_LEN) 1778 return -1; 1779 memcpy(eui, dev->dev_addr, 8); 1780 eui[0] ^= 2; 1781 return 0; 1782 } 1783 1784 static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev) 1785 { 1786 union fwnet_hwaddr *ha; 1787 1788 if (dev->addr_len != FWNET_ALEN) 1789 return -1; 1790 1791 ha = (union fwnet_hwaddr *)dev->dev_addr; 1792 1793 memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id)); 1794 eui[0] ^= 2; 1795 return 0; 1796 } 1797 1798 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev) 1799 { 1800 /* XXX: inherit EUI-64 from other interface -- yoshfuji */ 1801 if (dev->addr_len != ARCNET_ALEN) 1802 return -1; 1803 memset(eui, 0, 7); 1804 eui[7] = *(u8 *)dev->dev_addr; 1805 return 0; 1806 } 1807 1808 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev) 1809 { 1810 if (dev->addr_len != INFINIBAND_ALEN) 1811 return -1; 1812 memcpy(eui, dev->dev_addr + 12, 8); 1813 eui[0] |= 2; 1814 return 0; 1815 } 1816 1817 static int __ipv6_isatap_ifid(u8 *eui, __be32 addr) 1818 { 1819 if (addr == 0) 1820 return -1; 1821 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) || 1822 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) || 1823 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) || 1824 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) || 1825 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) || 1826 ipv4_is_lbcast(addr)) ? 0x00 : 0x02; 1827 eui[1] = 0; 1828 eui[2] = 0x5E; 1829 eui[3] = 0xFE; 1830 memcpy(eui + 4, &addr, 4); 1831 return 0; 1832 } 1833 1834 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev) 1835 { 1836 if (dev->priv_flags & IFF_ISATAP) 1837 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr); 1838 return -1; 1839 } 1840 1841 static int addrconf_ifid_gre(u8 *eui, struct net_device *dev) 1842 { 1843 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr); 1844 } 1845 1846 static int addrconf_ifid_ip6tnl(u8 *eui, struct net_device *dev) 1847 { 1848 memcpy(eui, dev->perm_addr, 3); 1849 memcpy(eui + 5, dev->perm_addr + 3, 3); 1850 eui[3] = 0xFF; 1851 eui[4] = 0xFE; 1852 eui[0] ^= 2; 1853 return 0; 1854 } 1855 1856 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev) 1857 { 1858 switch (dev->type) { 1859 case ARPHRD_ETHER: 1860 case ARPHRD_FDDI: 1861 return addrconf_ifid_eui48(eui, dev); 1862 case ARPHRD_ARCNET: 1863 return addrconf_ifid_arcnet(eui, dev); 1864 case ARPHRD_INFINIBAND: 1865 return addrconf_ifid_infiniband(eui, dev); 1866 case ARPHRD_SIT: 1867 return addrconf_ifid_sit(eui, dev); 1868 case ARPHRD_IPGRE: 1869 return addrconf_ifid_gre(eui, dev); 1870 case ARPHRD_6LOWPAN: 1871 case ARPHRD_IEEE802154: 1872 return addrconf_ifid_eui64(eui, dev); 1873 case ARPHRD_IEEE1394: 1874 return addrconf_ifid_ieee1394(eui, dev); 1875 case ARPHRD_TUNNEL6: 1876 return addrconf_ifid_ip6tnl(eui, dev); 1877 } 1878 return -1; 1879 } 1880 1881 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev) 1882 { 1883 int err = -1; 1884 struct inet6_ifaddr *ifp; 1885 1886 read_lock_bh(&idev->lock); 1887 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) { 1888 if (ifp->scope > IFA_LINK) 1889 break; 1890 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) { 1891 memcpy(eui, ifp->addr.s6_addr+8, 8); 1892 err = 0; 1893 break; 1894 } 1895 } 1896 read_unlock_bh(&idev->lock); 1897 return err; 1898 } 1899 1900 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */ 1901 static void __ipv6_regen_rndid(struct inet6_dev *idev) 1902 { 1903 regen: 1904 get_random_bytes(idev->rndid, sizeof(idev->rndid)); 1905 idev->rndid[0] &= ~0x02; 1906 1907 /* 1908 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>: 1909 * check if generated address is not inappropriate 1910 * 1911 * - Reserved subnet anycast (RFC 2526) 1912 * 11111101 11....11 1xxxxxxx 1913 * - ISATAP (RFC4214) 6.1 1914 * 00-00-5E-FE-xx-xx-xx-xx 1915 * - value 0 1916 * - XXX: already assigned to an address on the device 1917 */ 1918 if (idev->rndid[0] == 0xfd && 1919 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff && 1920 (idev->rndid[7]&0x80)) 1921 goto regen; 1922 if ((idev->rndid[0]|idev->rndid[1]) == 0) { 1923 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe) 1924 goto regen; 1925 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00) 1926 goto regen; 1927 } 1928 } 1929 1930 static void ipv6_regen_rndid(unsigned long data) 1931 { 1932 struct inet6_dev *idev = (struct inet6_dev *) data; 1933 unsigned long expires; 1934 1935 rcu_read_lock_bh(); 1936 write_lock_bh(&idev->lock); 1937 1938 if (idev->dead) 1939 goto out; 1940 1941 __ipv6_regen_rndid(idev); 1942 1943 expires = jiffies + 1944 idev->cnf.temp_prefered_lft * HZ - 1945 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * 1946 NEIGH_VAR(idev->nd_parms, RETRANS_TIME) - 1947 idev->cnf.max_desync_factor * HZ; 1948 if (time_before(expires, jiffies)) { 1949 pr_warn("%s: too short regeneration interval; timer disabled for %s\n", 1950 __func__, idev->dev->name); 1951 goto out; 1952 } 1953 1954 if (!mod_timer(&idev->regen_timer, expires)) 1955 in6_dev_hold(idev); 1956 1957 out: 1958 write_unlock_bh(&idev->lock); 1959 rcu_read_unlock_bh(); 1960 in6_dev_put(idev); 1961 } 1962 1963 static void __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) 1964 { 1965 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0) 1966 __ipv6_regen_rndid(idev); 1967 } 1968 1969 /* 1970 * Add prefix route. 1971 */ 1972 1973 static void 1974 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev, 1975 unsigned long expires, u32 flags) 1976 { 1977 struct fib6_config cfg = { 1978 .fc_table = RT6_TABLE_PREFIX, 1979 .fc_metric = IP6_RT_PRIO_ADDRCONF, 1980 .fc_ifindex = dev->ifindex, 1981 .fc_expires = expires, 1982 .fc_dst_len = plen, 1983 .fc_flags = RTF_UP | flags, 1984 .fc_nlinfo.nl_net = dev_net(dev), 1985 .fc_protocol = RTPROT_KERNEL, 1986 }; 1987 1988 cfg.fc_dst = *pfx; 1989 1990 /* Prevent useless cloning on PtP SIT. 1991 This thing is done here expecting that the whole 1992 class of non-broadcast devices need not cloning. 1993 */ 1994 #if IS_ENABLED(CONFIG_IPV6_SIT) 1995 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT)) 1996 cfg.fc_flags |= RTF_NONEXTHOP; 1997 #endif 1998 1999 ip6_route_add(&cfg); 2000 } 2001 2002 2003 static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx, 2004 int plen, 2005 const struct net_device *dev, 2006 u32 flags, u32 noflags) 2007 { 2008 struct fib6_node *fn; 2009 struct rt6_info *rt = NULL; 2010 struct fib6_table *table; 2011 2012 table = fib6_get_table(dev_net(dev), RT6_TABLE_PREFIX); 2013 if (table == NULL) 2014 return NULL; 2015 2016 read_lock_bh(&table->tb6_lock); 2017 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0); 2018 if (!fn) 2019 goto out; 2020 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) { 2021 if (rt->dst.dev->ifindex != dev->ifindex) 2022 continue; 2023 if ((rt->rt6i_flags & flags) != flags) 2024 continue; 2025 if ((rt->rt6i_flags & noflags) != 0) 2026 continue; 2027 dst_hold(&rt->dst); 2028 break; 2029 } 2030 out: 2031 read_unlock_bh(&table->tb6_lock); 2032 return rt; 2033 } 2034 2035 2036 /* Create "default" multicast route to the interface */ 2037 2038 static void addrconf_add_mroute(struct net_device *dev) 2039 { 2040 struct fib6_config cfg = { 2041 .fc_table = RT6_TABLE_LOCAL, 2042 .fc_metric = IP6_RT_PRIO_ADDRCONF, 2043 .fc_ifindex = dev->ifindex, 2044 .fc_dst_len = 8, 2045 .fc_flags = RTF_UP, 2046 .fc_nlinfo.nl_net = dev_net(dev), 2047 }; 2048 2049 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0); 2050 2051 ip6_route_add(&cfg); 2052 } 2053 2054 static struct inet6_dev *addrconf_add_dev(struct net_device *dev) 2055 { 2056 struct inet6_dev *idev; 2057 2058 ASSERT_RTNL(); 2059 2060 idev = ipv6_find_idev(dev); 2061 if (!idev) 2062 return ERR_PTR(-ENOBUFS); 2063 2064 if (idev->cnf.disable_ipv6) 2065 return ERR_PTR(-EACCES); 2066 2067 /* Add default multicast route */ 2068 if (!(dev->flags & IFF_LOOPBACK)) 2069 addrconf_add_mroute(dev); 2070 2071 return idev; 2072 } 2073 2074 static void manage_tempaddrs(struct inet6_dev *idev, 2075 struct inet6_ifaddr *ifp, 2076 __u32 valid_lft, __u32 prefered_lft, 2077 bool create, unsigned long now) 2078 { 2079 u32 flags; 2080 struct inet6_ifaddr *ift; 2081 2082 read_lock_bh(&idev->lock); 2083 /* update all temporary addresses in the list */ 2084 list_for_each_entry(ift, &idev->tempaddr_list, tmp_list) { 2085 int age, max_valid, max_prefered; 2086 2087 if (ifp != ift->ifpub) 2088 continue; 2089 2090 /* RFC 4941 section 3.3: 2091 * If a received option will extend the lifetime of a public 2092 * address, the lifetimes of temporary addresses should 2093 * be extended, subject to the overall constraint that no 2094 * temporary addresses should ever remain "valid" or "preferred" 2095 * for a time longer than (TEMP_VALID_LIFETIME) or 2096 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), respectively. 2097 */ 2098 age = (now - ift->cstamp) / HZ; 2099 max_valid = idev->cnf.temp_valid_lft - age; 2100 if (max_valid < 0) 2101 max_valid = 0; 2102 2103 max_prefered = idev->cnf.temp_prefered_lft - 2104 idev->cnf.max_desync_factor - age; 2105 if (max_prefered < 0) 2106 max_prefered = 0; 2107 2108 if (valid_lft > max_valid) 2109 valid_lft = max_valid; 2110 2111 if (prefered_lft > max_prefered) 2112 prefered_lft = max_prefered; 2113 2114 spin_lock(&ift->lock); 2115 flags = ift->flags; 2116 ift->valid_lft = valid_lft; 2117 ift->prefered_lft = prefered_lft; 2118 ift->tstamp = now; 2119 if (prefered_lft > 0) 2120 ift->flags &= ~IFA_F_DEPRECATED; 2121 2122 spin_unlock(&ift->lock); 2123 if (!(flags&IFA_F_TENTATIVE)) 2124 ipv6_ifa_notify(0, ift); 2125 } 2126 2127 if ((create || list_empty(&idev->tempaddr_list)) && 2128 idev->cnf.use_tempaddr > 0) { 2129 /* When a new public address is created as described 2130 * in [ADDRCONF], also create a new temporary address. 2131 * Also create a temporary address if it's enabled but 2132 * no temporary address currently exists. 2133 */ 2134 read_unlock_bh(&idev->lock); 2135 ipv6_create_tempaddr(ifp, NULL); 2136 } else { 2137 read_unlock_bh(&idev->lock); 2138 } 2139 } 2140 2141 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao) 2142 { 2143 struct prefix_info *pinfo; 2144 __u32 valid_lft; 2145 __u32 prefered_lft; 2146 int addr_type; 2147 struct inet6_dev *in6_dev; 2148 struct net *net = dev_net(dev); 2149 2150 pinfo = (struct prefix_info *) opt; 2151 2152 if (len < sizeof(struct prefix_info)) { 2153 ADBG("addrconf: prefix option too short\n"); 2154 return; 2155 } 2156 2157 /* 2158 * Validation checks ([ADDRCONF], page 19) 2159 */ 2160 2161 addr_type = ipv6_addr_type(&pinfo->prefix); 2162 2163 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL)) 2164 return; 2165 2166 valid_lft = ntohl(pinfo->valid); 2167 prefered_lft = ntohl(pinfo->prefered); 2168 2169 if (prefered_lft > valid_lft) { 2170 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n"); 2171 return; 2172 } 2173 2174 in6_dev = in6_dev_get(dev); 2175 2176 if (in6_dev == NULL) { 2177 net_dbg_ratelimited("addrconf: device %s not configured\n", 2178 dev->name); 2179 return; 2180 } 2181 2182 /* 2183 * Two things going on here: 2184 * 1) Add routes for on-link prefixes 2185 * 2) Configure prefixes with the auto flag set 2186 */ 2187 2188 if (pinfo->onlink) { 2189 struct rt6_info *rt; 2190 unsigned long rt_expires; 2191 2192 /* Avoid arithmetic overflow. Really, we could 2193 * save rt_expires in seconds, likely valid_lft, 2194 * but it would require division in fib gc, that it 2195 * not good. 2196 */ 2197 if (HZ > USER_HZ) 2198 rt_expires = addrconf_timeout_fixup(valid_lft, HZ); 2199 else 2200 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ); 2201 2202 if (addrconf_finite_timeout(rt_expires)) 2203 rt_expires *= HZ; 2204 2205 rt = addrconf_get_prefix_route(&pinfo->prefix, 2206 pinfo->prefix_len, 2207 dev, 2208 RTF_ADDRCONF | RTF_PREFIX_RT, 2209 RTF_GATEWAY | RTF_DEFAULT); 2210 2211 if (rt) { 2212 /* Autoconf prefix route */ 2213 if (valid_lft == 0) { 2214 ip6_del_rt(rt); 2215 rt = NULL; 2216 } else if (addrconf_finite_timeout(rt_expires)) { 2217 /* not infinity */ 2218 rt6_set_expires(rt, jiffies + rt_expires); 2219 } else { 2220 rt6_clean_expires(rt); 2221 } 2222 } else if (valid_lft) { 2223 clock_t expires = 0; 2224 int flags = RTF_ADDRCONF | RTF_PREFIX_RT; 2225 if (addrconf_finite_timeout(rt_expires)) { 2226 /* not infinity */ 2227 flags |= RTF_EXPIRES; 2228 expires = jiffies_to_clock_t(rt_expires); 2229 } 2230 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len, 2231 dev, expires, flags); 2232 } 2233 ip6_rt_put(rt); 2234 } 2235 2236 /* Try to figure out our local address for this prefix */ 2237 2238 if (pinfo->autoconf && in6_dev->cnf.autoconf) { 2239 struct inet6_ifaddr *ifp; 2240 struct in6_addr addr; 2241 int create = 0, update_lft = 0; 2242 bool tokenized = false; 2243 2244 if (pinfo->prefix_len == 64) { 2245 memcpy(&addr, &pinfo->prefix, 8); 2246 2247 if (!ipv6_addr_any(&in6_dev->token)) { 2248 read_lock_bh(&in6_dev->lock); 2249 memcpy(addr.s6_addr + 8, 2250 in6_dev->token.s6_addr + 8, 8); 2251 read_unlock_bh(&in6_dev->lock); 2252 tokenized = true; 2253 } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) && 2254 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) { 2255 in6_dev_put(in6_dev); 2256 return; 2257 } 2258 goto ok; 2259 } 2260 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n", 2261 pinfo->prefix_len); 2262 in6_dev_put(in6_dev); 2263 return; 2264 2265 ok: 2266 2267 ifp = ipv6_get_ifaddr(net, &addr, dev, 1); 2268 2269 if (ifp == NULL && valid_lft) { 2270 int max_addresses = in6_dev->cnf.max_addresses; 2271 u32 addr_flags = 0; 2272 2273 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 2274 if (in6_dev->cnf.optimistic_dad && 2275 !net->ipv6.devconf_all->forwarding && sllao) 2276 addr_flags = IFA_F_OPTIMISTIC; 2277 #endif 2278 2279 /* Do not allow to create too much of autoconfigured 2280 * addresses; this would be too easy way to crash kernel. 2281 */ 2282 if (!max_addresses || 2283 ipv6_count_addresses(in6_dev) < max_addresses) 2284 ifp = ipv6_add_addr(in6_dev, &addr, NULL, 2285 pinfo->prefix_len, 2286 addr_type&IPV6_ADDR_SCOPE_MASK, 2287 addr_flags, valid_lft, 2288 prefered_lft); 2289 2290 if (IS_ERR_OR_NULL(ifp)) { 2291 in6_dev_put(in6_dev); 2292 return; 2293 } 2294 2295 update_lft = 0; 2296 create = 1; 2297 spin_lock_bh(&ifp->lock); 2298 ifp->flags |= IFA_F_MANAGETEMPADDR; 2299 ifp->cstamp = jiffies; 2300 ifp->tokenized = tokenized; 2301 spin_unlock_bh(&ifp->lock); 2302 addrconf_dad_start(ifp); 2303 } 2304 2305 if (ifp) { 2306 u32 flags; 2307 unsigned long now; 2308 u32 stored_lft; 2309 2310 /* update lifetime (RFC2462 5.5.3 e) */ 2311 spin_lock(&ifp->lock); 2312 now = jiffies; 2313 if (ifp->valid_lft > (now - ifp->tstamp) / HZ) 2314 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ; 2315 else 2316 stored_lft = 0; 2317 if (!update_lft && !create && stored_lft) { 2318 const u32 minimum_lft = min( 2319 stored_lft, (u32)MIN_VALID_LIFETIME); 2320 valid_lft = max(valid_lft, minimum_lft); 2321 2322 /* RFC4862 Section 5.5.3e: 2323 * "Note that the preferred lifetime of the 2324 * corresponding address is always reset to 2325 * the Preferred Lifetime in the received 2326 * Prefix Information option, regardless of 2327 * whether the valid lifetime is also reset or 2328 * ignored." 2329 * 2330 * So we should always update prefered_lft here. 2331 */ 2332 update_lft = 1; 2333 } 2334 2335 if (update_lft) { 2336 ifp->valid_lft = valid_lft; 2337 ifp->prefered_lft = prefered_lft; 2338 ifp->tstamp = now; 2339 flags = ifp->flags; 2340 ifp->flags &= ~IFA_F_DEPRECATED; 2341 spin_unlock(&ifp->lock); 2342 2343 if (!(flags&IFA_F_TENTATIVE)) 2344 ipv6_ifa_notify(0, ifp); 2345 } else 2346 spin_unlock(&ifp->lock); 2347 2348 manage_tempaddrs(in6_dev, ifp, valid_lft, prefered_lft, 2349 create, now); 2350 2351 in6_ifa_put(ifp); 2352 addrconf_verify(); 2353 } 2354 } 2355 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo); 2356 in6_dev_put(in6_dev); 2357 } 2358 2359 /* 2360 * Set destination address. 2361 * Special case for SIT interfaces where we create a new "virtual" 2362 * device. 2363 */ 2364 int addrconf_set_dstaddr(struct net *net, void __user *arg) 2365 { 2366 struct in6_ifreq ireq; 2367 struct net_device *dev; 2368 int err = -EINVAL; 2369 2370 rtnl_lock(); 2371 2372 err = -EFAULT; 2373 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2374 goto err_exit; 2375 2376 dev = __dev_get_by_index(net, ireq.ifr6_ifindex); 2377 2378 err = -ENODEV; 2379 if (dev == NULL) 2380 goto err_exit; 2381 2382 #if IS_ENABLED(CONFIG_IPV6_SIT) 2383 if (dev->type == ARPHRD_SIT) { 2384 const struct net_device_ops *ops = dev->netdev_ops; 2385 struct ifreq ifr; 2386 struct ip_tunnel_parm p; 2387 2388 err = -EADDRNOTAVAIL; 2389 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4)) 2390 goto err_exit; 2391 2392 memset(&p, 0, sizeof(p)); 2393 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3]; 2394 p.iph.saddr = 0; 2395 p.iph.version = 4; 2396 p.iph.ihl = 5; 2397 p.iph.protocol = IPPROTO_IPV6; 2398 p.iph.ttl = 64; 2399 ifr.ifr_ifru.ifru_data = (__force void __user *)&p; 2400 2401 if (ops->ndo_do_ioctl) { 2402 mm_segment_t oldfs = get_fs(); 2403 2404 set_fs(KERNEL_DS); 2405 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL); 2406 set_fs(oldfs); 2407 } else 2408 err = -EOPNOTSUPP; 2409 2410 if (err == 0) { 2411 err = -ENOBUFS; 2412 dev = __dev_get_by_name(net, p.name); 2413 if (!dev) 2414 goto err_exit; 2415 err = dev_open(dev); 2416 } 2417 } 2418 #endif 2419 2420 err_exit: 2421 rtnl_unlock(); 2422 return err; 2423 } 2424 2425 /* 2426 * Manual configuration of address on an interface 2427 */ 2428 static int inet6_addr_add(struct net *net, int ifindex, 2429 const struct in6_addr *pfx, 2430 const struct in6_addr *peer_pfx, 2431 unsigned int plen, __u32 ifa_flags, 2432 __u32 prefered_lft, __u32 valid_lft) 2433 { 2434 struct inet6_ifaddr *ifp; 2435 struct inet6_dev *idev; 2436 struct net_device *dev; 2437 int scope; 2438 u32 flags; 2439 clock_t expires; 2440 unsigned long timeout; 2441 2442 ASSERT_RTNL(); 2443 2444 if (plen > 128) 2445 return -EINVAL; 2446 2447 /* check the lifetime */ 2448 if (!valid_lft || prefered_lft > valid_lft) 2449 return -EINVAL; 2450 2451 if (ifa_flags & IFA_F_MANAGETEMPADDR && plen != 64) 2452 return -EINVAL; 2453 2454 dev = __dev_get_by_index(net, ifindex); 2455 if (!dev) 2456 return -ENODEV; 2457 2458 idev = addrconf_add_dev(dev); 2459 if (IS_ERR(idev)) 2460 return PTR_ERR(idev); 2461 2462 scope = ipv6_addr_scope(pfx); 2463 2464 timeout = addrconf_timeout_fixup(valid_lft, HZ); 2465 if (addrconf_finite_timeout(timeout)) { 2466 expires = jiffies_to_clock_t(timeout * HZ); 2467 valid_lft = timeout; 2468 flags = RTF_EXPIRES; 2469 } else { 2470 expires = 0; 2471 flags = 0; 2472 ifa_flags |= IFA_F_PERMANENT; 2473 } 2474 2475 timeout = addrconf_timeout_fixup(prefered_lft, HZ); 2476 if (addrconf_finite_timeout(timeout)) { 2477 if (timeout == 0) 2478 ifa_flags |= IFA_F_DEPRECATED; 2479 prefered_lft = timeout; 2480 } 2481 2482 ifp = ipv6_add_addr(idev, pfx, peer_pfx, plen, scope, ifa_flags, 2483 valid_lft, prefered_lft); 2484 2485 if (!IS_ERR(ifp)) { 2486 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) { 2487 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev, 2488 expires, flags); 2489 } 2490 2491 /* 2492 * Note that section 3.1 of RFC 4429 indicates 2493 * that the Optimistic flag should not be set for 2494 * manually configured addresses 2495 */ 2496 addrconf_dad_start(ifp); 2497 if (ifa_flags & IFA_F_MANAGETEMPADDR) 2498 manage_tempaddrs(idev, ifp, valid_lft, prefered_lft, 2499 true, jiffies); 2500 in6_ifa_put(ifp); 2501 addrconf_verify_rtnl(); 2502 return 0; 2503 } 2504 2505 return PTR_ERR(ifp); 2506 } 2507 2508 static int inet6_addr_del(struct net *net, int ifindex, u32 ifa_flags, 2509 const struct in6_addr *pfx, unsigned int plen) 2510 { 2511 struct inet6_ifaddr *ifp; 2512 struct inet6_dev *idev; 2513 struct net_device *dev; 2514 2515 if (plen > 128) 2516 return -EINVAL; 2517 2518 dev = __dev_get_by_index(net, ifindex); 2519 if (!dev) 2520 return -ENODEV; 2521 2522 if ((idev = __in6_dev_get(dev)) == NULL) 2523 return -ENXIO; 2524 2525 read_lock_bh(&idev->lock); 2526 list_for_each_entry(ifp, &idev->addr_list, if_list) { 2527 if (ifp->prefix_len == plen && 2528 ipv6_addr_equal(pfx, &ifp->addr)) { 2529 in6_ifa_hold(ifp); 2530 read_unlock_bh(&idev->lock); 2531 2532 if (!(ifp->flags & IFA_F_TEMPORARY) && 2533 (ifa_flags & IFA_F_MANAGETEMPADDR)) 2534 manage_tempaddrs(idev, ifp, 0, 0, false, 2535 jiffies); 2536 ipv6_del_addr(ifp); 2537 addrconf_verify_rtnl(); 2538 return 0; 2539 } 2540 } 2541 read_unlock_bh(&idev->lock); 2542 return -EADDRNOTAVAIL; 2543 } 2544 2545 2546 int addrconf_add_ifaddr(struct net *net, void __user *arg) 2547 { 2548 struct in6_ifreq ireq; 2549 int err; 2550 2551 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 2552 return -EPERM; 2553 2554 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2555 return -EFAULT; 2556 2557 rtnl_lock(); 2558 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, NULL, 2559 ireq.ifr6_prefixlen, IFA_F_PERMANENT, 2560 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME); 2561 rtnl_unlock(); 2562 return err; 2563 } 2564 2565 int addrconf_del_ifaddr(struct net *net, void __user *arg) 2566 { 2567 struct in6_ifreq ireq; 2568 int err; 2569 2570 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 2571 return -EPERM; 2572 2573 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2574 return -EFAULT; 2575 2576 rtnl_lock(); 2577 err = inet6_addr_del(net, ireq.ifr6_ifindex, 0, &ireq.ifr6_addr, 2578 ireq.ifr6_prefixlen); 2579 rtnl_unlock(); 2580 return err; 2581 } 2582 2583 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr, 2584 int plen, int scope) 2585 { 2586 struct inet6_ifaddr *ifp; 2587 2588 ifp = ipv6_add_addr(idev, addr, NULL, plen, 2589 scope, IFA_F_PERMANENT, 2590 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME); 2591 if (!IS_ERR(ifp)) { 2592 spin_lock_bh(&ifp->lock); 2593 ifp->flags &= ~IFA_F_TENTATIVE; 2594 spin_unlock_bh(&ifp->lock); 2595 ipv6_ifa_notify(RTM_NEWADDR, ifp); 2596 in6_ifa_put(ifp); 2597 } 2598 } 2599 2600 #if IS_ENABLED(CONFIG_IPV6_SIT) 2601 static void sit_add_v4_addrs(struct inet6_dev *idev) 2602 { 2603 struct in6_addr addr; 2604 struct net_device *dev; 2605 struct net *net = dev_net(idev->dev); 2606 int scope, plen; 2607 u32 pflags = 0; 2608 2609 ASSERT_RTNL(); 2610 2611 memset(&addr, 0, sizeof(struct in6_addr)); 2612 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4); 2613 2614 if (idev->dev->flags&IFF_POINTOPOINT) { 2615 addr.s6_addr32[0] = htonl(0xfe800000); 2616 scope = IFA_LINK; 2617 plen = 64; 2618 } else { 2619 scope = IPV6_ADDR_COMPATv4; 2620 plen = 96; 2621 pflags |= RTF_NONEXTHOP; 2622 } 2623 2624 if (addr.s6_addr32[3]) { 2625 add_addr(idev, &addr, plen, scope); 2626 addrconf_prefix_route(&addr, plen, idev->dev, 0, pflags); 2627 return; 2628 } 2629 2630 for_each_netdev(net, dev) { 2631 struct in_device *in_dev = __in_dev_get_rtnl(dev); 2632 if (in_dev && (dev->flags & IFF_UP)) { 2633 struct in_ifaddr *ifa; 2634 2635 int flag = scope; 2636 2637 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) { 2638 2639 addr.s6_addr32[3] = ifa->ifa_local; 2640 2641 if (ifa->ifa_scope == RT_SCOPE_LINK) 2642 continue; 2643 if (ifa->ifa_scope >= RT_SCOPE_HOST) { 2644 if (idev->dev->flags&IFF_POINTOPOINT) 2645 continue; 2646 flag |= IFA_HOST; 2647 } 2648 2649 add_addr(idev, &addr, plen, flag); 2650 addrconf_prefix_route(&addr, plen, idev->dev, 0, 2651 pflags); 2652 } 2653 } 2654 } 2655 } 2656 #endif 2657 2658 static void init_loopback(struct net_device *dev) 2659 { 2660 struct inet6_dev *idev; 2661 struct net_device *sp_dev; 2662 struct inet6_ifaddr *sp_ifa; 2663 struct rt6_info *sp_rt; 2664 2665 /* ::1 */ 2666 2667 ASSERT_RTNL(); 2668 2669 if ((idev = ipv6_find_idev(dev)) == NULL) { 2670 pr_debug("%s: add_dev failed\n", __func__); 2671 return; 2672 } 2673 2674 add_addr(idev, &in6addr_loopback, 128, IFA_HOST); 2675 2676 /* Add routes to other interface's IPv6 addresses */ 2677 for_each_netdev(dev_net(dev), sp_dev) { 2678 if (!strcmp(sp_dev->name, dev->name)) 2679 continue; 2680 2681 idev = __in6_dev_get(sp_dev); 2682 if (!idev) 2683 continue; 2684 2685 read_lock_bh(&idev->lock); 2686 list_for_each_entry(sp_ifa, &idev->addr_list, if_list) { 2687 2688 if (sp_ifa->flags & (IFA_F_DADFAILED | IFA_F_TENTATIVE)) 2689 continue; 2690 2691 if (sp_ifa->rt) { 2692 /* This dst has been added to garbage list when 2693 * lo device down, release this obsolete dst and 2694 * reallocate a new router for ifa. 2695 */ 2696 if (sp_ifa->rt->dst.obsolete > 0) { 2697 ip6_rt_put(sp_ifa->rt); 2698 sp_ifa->rt = NULL; 2699 } else { 2700 continue; 2701 } 2702 } 2703 2704 sp_rt = addrconf_dst_alloc(idev, &sp_ifa->addr, false); 2705 2706 /* Failure cases are ignored */ 2707 if (!IS_ERR(sp_rt)) { 2708 sp_ifa->rt = sp_rt; 2709 ip6_ins_rt(sp_rt); 2710 } 2711 } 2712 read_unlock_bh(&idev->lock); 2713 } 2714 } 2715 2716 static void addrconf_add_linklocal(struct inet6_dev *idev, const struct in6_addr *addr) 2717 { 2718 struct inet6_ifaddr *ifp; 2719 u32 addr_flags = IFA_F_PERMANENT; 2720 2721 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 2722 if (idev->cnf.optimistic_dad && 2723 !dev_net(idev->dev)->ipv6.devconf_all->forwarding) 2724 addr_flags |= IFA_F_OPTIMISTIC; 2725 #endif 2726 2727 2728 ifp = ipv6_add_addr(idev, addr, NULL, 64, IFA_LINK, addr_flags, 2729 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME); 2730 if (!IS_ERR(ifp)) { 2731 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0); 2732 addrconf_dad_start(ifp); 2733 in6_ifa_put(ifp); 2734 } 2735 } 2736 2737 static void addrconf_addr_gen(struct inet6_dev *idev, bool prefix_route) 2738 { 2739 if (idev->addr_gen_mode == IN6_ADDR_GEN_MODE_EUI64) { 2740 struct in6_addr addr; 2741 2742 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0); 2743 /* addrconf_add_linklocal also adds a prefix_route and we 2744 * only need to care about prefix routes if ipv6_generate_eui64 2745 * couldn't generate one. 2746 */ 2747 if (ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) == 0) 2748 addrconf_add_linklocal(idev, &addr); 2749 else if (prefix_route) 2750 addrconf_prefix_route(&addr, 64, idev->dev, 0, 0); 2751 } 2752 } 2753 2754 static void addrconf_dev_config(struct net_device *dev) 2755 { 2756 struct inet6_dev *idev; 2757 2758 ASSERT_RTNL(); 2759 2760 if ((dev->type != ARPHRD_ETHER) && 2761 (dev->type != ARPHRD_FDDI) && 2762 (dev->type != ARPHRD_ARCNET) && 2763 (dev->type != ARPHRD_INFINIBAND) && 2764 (dev->type != ARPHRD_IEEE802154) && 2765 (dev->type != ARPHRD_IEEE1394) && 2766 (dev->type != ARPHRD_TUNNEL6) && 2767 (dev->type != ARPHRD_6LOWPAN)) { 2768 /* Alas, we support only Ethernet autoconfiguration. */ 2769 return; 2770 } 2771 2772 idev = addrconf_add_dev(dev); 2773 if (IS_ERR(idev)) 2774 return; 2775 2776 addrconf_addr_gen(idev, false); 2777 } 2778 2779 #if IS_ENABLED(CONFIG_IPV6_SIT) 2780 static void addrconf_sit_config(struct net_device *dev) 2781 { 2782 struct inet6_dev *idev; 2783 2784 ASSERT_RTNL(); 2785 2786 /* 2787 * Configure the tunnel with one of our IPv4 2788 * addresses... we should configure all of 2789 * our v4 addrs in the tunnel 2790 */ 2791 2792 if ((idev = ipv6_find_idev(dev)) == NULL) { 2793 pr_debug("%s: add_dev failed\n", __func__); 2794 return; 2795 } 2796 2797 if (dev->priv_flags & IFF_ISATAP) { 2798 addrconf_addr_gen(idev, false); 2799 return; 2800 } 2801 2802 sit_add_v4_addrs(idev); 2803 2804 if (dev->flags&IFF_POINTOPOINT) 2805 addrconf_add_mroute(dev); 2806 } 2807 #endif 2808 2809 #if IS_ENABLED(CONFIG_NET_IPGRE) 2810 static void addrconf_gre_config(struct net_device *dev) 2811 { 2812 struct inet6_dev *idev; 2813 2814 ASSERT_RTNL(); 2815 2816 if ((idev = ipv6_find_idev(dev)) == NULL) { 2817 pr_debug("%s: add_dev failed\n", __func__); 2818 return; 2819 } 2820 2821 addrconf_addr_gen(idev, true); 2822 } 2823 #endif 2824 2825 static int addrconf_notify(struct notifier_block *this, unsigned long event, 2826 void *ptr) 2827 { 2828 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 2829 struct inet6_dev *idev = __in6_dev_get(dev); 2830 int run_pending = 0; 2831 int err; 2832 2833 switch (event) { 2834 case NETDEV_REGISTER: 2835 if (!idev && dev->mtu >= IPV6_MIN_MTU) { 2836 idev = ipv6_add_dev(dev); 2837 if (IS_ERR(idev)) 2838 return notifier_from_errno(PTR_ERR(idev)); 2839 } 2840 break; 2841 2842 case NETDEV_UP: 2843 case NETDEV_CHANGE: 2844 if (dev->flags & IFF_SLAVE) 2845 break; 2846 2847 if (event == NETDEV_UP) { 2848 if (!addrconf_qdisc_ok(dev)) { 2849 /* device is not ready yet. */ 2850 pr_info("ADDRCONF(NETDEV_UP): %s: link is not ready\n", 2851 dev->name); 2852 break; 2853 } 2854 2855 if (!idev && dev->mtu >= IPV6_MIN_MTU) 2856 idev = ipv6_add_dev(dev); 2857 2858 if (!IS_ERR_OR_NULL(idev)) { 2859 idev->if_flags |= IF_READY; 2860 run_pending = 1; 2861 } 2862 } else { 2863 if (!addrconf_qdisc_ok(dev)) { 2864 /* device is still not ready. */ 2865 break; 2866 } 2867 2868 if (idev) { 2869 if (idev->if_flags & IF_READY) 2870 /* device is already configured. */ 2871 break; 2872 idev->if_flags |= IF_READY; 2873 } 2874 2875 pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n", 2876 dev->name); 2877 2878 run_pending = 1; 2879 } 2880 2881 switch (dev->type) { 2882 #if IS_ENABLED(CONFIG_IPV6_SIT) 2883 case ARPHRD_SIT: 2884 addrconf_sit_config(dev); 2885 break; 2886 #endif 2887 #if IS_ENABLED(CONFIG_NET_IPGRE) 2888 case ARPHRD_IPGRE: 2889 addrconf_gre_config(dev); 2890 break; 2891 #endif 2892 case ARPHRD_LOOPBACK: 2893 init_loopback(dev); 2894 break; 2895 2896 default: 2897 addrconf_dev_config(dev); 2898 break; 2899 } 2900 2901 if (!IS_ERR_OR_NULL(idev)) { 2902 if (run_pending) 2903 addrconf_dad_run(idev); 2904 2905 /* 2906 * If the MTU changed during the interface down, 2907 * when the interface up, the changed MTU must be 2908 * reflected in the idev as well as routers. 2909 */ 2910 if (idev->cnf.mtu6 != dev->mtu && 2911 dev->mtu >= IPV6_MIN_MTU) { 2912 rt6_mtu_change(dev, dev->mtu); 2913 idev->cnf.mtu6 = dev->mtu; 2914 } 2915 idev->tstamp = jiffies; 2916 inet6_ifinfo_notify(RTM_NEWLINK, idev); 2917 2918 /* 2919 * If the changed mtu during down is lower than 2920 * IPV6_MIN_MTU stop IPv6 on this interface. 2921 */ 2922 if (dev->mtu < IPV6_MIN_MTU) 2923 addrconf_ifdown(dev, 1); 2924 } 2925 break; 2926 2927 case NETDEV_CHANGEMTU: 2928 if (idev && dev->mtu >= IPV6_MIN_MTU) { 2929 rt6_mtu_change(dev, dev->mtu); 2930 idev->cnf.mtu6 = dev->mtu; 2931 break; 2932 } 2933 2934 if (!idev && dev->mtu >= IPV6_MIN_MTU) { 2935 idev = ipv6_add_dev(dev); 2936 if (!IS_ERR(idev)) 2937 break; 2938 } 2939 2940 /* 2941 * if MTU under IPV6_MIN_MTU. 2942 * Stop IPv6 on this interface. 2943 */ 2944 2945 case NETDEV_DOWN: 2946 case NETDEV_UNREGISTER: 2947 /* 2948 * Remove all addresses from this interface. 2949 */ 2950 addrconf_ifdown(dev, event != NETDEV_DOWN); 2951 break; 2952 2953 case NETDEV_CHANGENAME: 2954 if (idev) { 2955 snmp6_unregister_dev(idev); 2956 addrconf_sysctl_unregister(idev); 2957 err = addrconf_sysctl_register(idev); 2958 if (err) 2959 return notifier_from_errno(err); 2960 err = snmp6_register_dev(idev); 2961 if (err) { 2962 addrconf_sysctl_unregister(idev); 2963 return notifier_from_errno(err); 2964 } 2965 } 2966 break; 2967 2968 case NETDEV_PRE_TYPE_CHANGE: 2969 case NETDEV_POST_TYPE_CHANGE: 2970 addrconf_type_change(dev, event); 2971 break; 2972 } 2973 2974 return NOTIFY_OK; 2975 } 2976 2977 /* 2978 * addrconf module should be notified of a device going up 2979 */ 2980 static struct notifier_block ipv6_dev_notf = { 2981 .notifier_call = addrconf_notify, 2982 }; 2983 2984 static void addrconf_type_change(struct net_device *dev, unsigned long event) 2985 { 2986 struct inet6_dev *idev; 2987 ASSERT_RTNL(); 2988 2989 idev = __in6_dev_get(dev); 2990 2991 if (event == NETDEV_POST_TYPE_CHANGE) 2992 ipv6_mc_remap(idev); 2993 else if (event == NETDEV_PRE_TYPE_CHANGE) 2994 ipv6_mc_unmap(idev); 2995 } 2996 2997 static int addrconf_ifdown(struct net_device *dev, int how) 2998 { 2999 struct net *net = dev_net(dev); 3000 struct inet6_dev *idev; 3001 struct inet6_ifaddr *ifa; 3002 int state, i; 3003 3004 ASSERT_RTNL(); 3005 3006 rt6_ifdown(net, dev); 3007 neigh_ifdown(&nd_tbl, dev); 3008 3009 idev = __in6_dev_get(dev); 3010 if (idev == NULL) 3011 return -ENODEV; 3012 3013 /* 3014 * Step 1: remove reference to ipv6 device from parent device. 3015 * Do not dev_put! 3016 */ 3017 if (how) { 3018 idev->dead = 1; 3019 3020 /* protected by rtnl_lock */ 3021 RCU_INIT_POINTER(dev->ip6_ptr, NULL); 3022 3023 /* Step 1.5: remove snmp6 entry */ 3024 snmp6_unregister_dev(idev); 3025 3026 } 3027 3028 /* Step 2: clear hash table */ 3029 for (i = 0; i < IN6_ADDR_HSIZE; i++) { 3030 struct hlist_head *h = &inet6_addr_lst[i]; 3031 3032 spin_lock_bh(&addrconf_hash_lock); 3033 restart: 3034 hlist_for_each_entry_rcu(ifa, h, addr_lst) { 3035 if (ifa->idev == idev) { 3036 hlist_del_init_rcu(&ifa->addr_lst); 3037 addrconf_del_dad_work(ifa); 3038 goto restart; 3039 } 3040 } 3041 spin_unlock_bh(&addrconf_hash_lock); 3042 } 3043 3044 write_lock_bh(&idev->lock); 3045 3046 addrconf_del_rs_timer(idev); 3047 3048 /* Step 2: clear flags for stateless addrconf */ 3049 if (!how) 3050 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY); 3051 3052 if (how && del_timer(&idev->regen_timer)) 3053 in6_dev_put(idev); 3054 3055 /* Step 3: clear tempaddr list */ 3056 while (!list_empty(&idev->tempaddr_list)) { 3057 ifa = list_first_entry(&idev->tempaddr_list, 3058 struct inet6_ifaddr, tmp_list); 3059 list_del(&ifa->tmp_list); 3060 write_unlock_bh(&idev->lock); 3061 spin_lock_bh(&ifa->lock); 3062 3063 if (ifa->ifpub) { 3064 in6_ifa_put(ifa->ifpub); 3065 ifa->ifpub = NULL; 3066 } 3067 spin_unlock_bh(&ifa->lock); 3068 in6_ifa_put(ifa); 3069 write_lock_bh(&idev->lock); 3070 } 3071 3072 while (!list_empty(&idev->addr_list)) { 3073 ifa = list_first_entry(&idev->addr_list, 3074 struct inet6_ifaddr, if_list); 3075 addrconf_del_dad_work(ifa); 3076 3077 list_del(&ifa->if_list); 3078 3079 write_unlock_bh(&idev->lock); 3080 3081 spin_lock_bh(&ifa->state_lock); 3082 state = ifa->state; 3083 ifa->state = INET6_IFADDR_STATE_DEAD; 3084 spin_unlock_bh(&ifa->state_lock); 3085 3086 if (state != INET6_IFADDR_STATE_DEAD) { 3087 __ipv6_ifa_notify(RTM_DELADDR, ifa); 3088 inet6addr_notifier_call_chain(NETDEV_DOWN, ifa); 3089 } 3090 in6_ifa_put(ifa); 3091 3092 write_lock_bh(&idev->lock); 3093 } 3094 3095 write_unlock_bh(&idev->lock); 3096 3097 /* Step 5: Discard anycast and multicast list */ 3098 if (how) { 3099 ipv6_ac_destroy_dev(idev); 3100 ipv6_mc_destroy_dev(idev); 3101 } else { 3102 ipv6_mc_down(idev); 3103 } 3104 3105 idev->tstamp = jiffies; 3106 3107 /* Last: Shot the device (if unregistered) */ 3108 if (how) { 3109 addrconf_sysctl_unregister(idev); 3110 neigh_parms_release(&nd_tbl, idev->nd_parms); 3111 neigh_ifdown(&nd_tbl, dev); 3112 in6_dev_put(idev); 3113 } 3114 return 0; 3115 } 3116 3117 static void addrconf_rs_timer(unsigned long data) 3118 { 3119 struct inet6_dev *idev = (struct inet6_dev *)data; 3120 struct net_device *dev = idev->dev; 3121 struct in6_addr lladdr; 3122 3123 write_lock(&idev->lock); 3124 if (idev->dead || !(idev->if_flags & IF_READY)) 3125 goto out; 3126 3127 if (!ipv6_accept_ra(idev)) 3128 goto out; 3129 3130 /* Announcement received after solicitation was sent */ 3131 if (idev->if_flags & IF_RA_RCVD) 3132 goto out; 3133 3134 if (idev->rs_probes++ < idev->cnf.rtr_solicits) { 3135 write_unlock(&idev->lock); 3136 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE)) 3137 ndisc_send_rs(dev, &lladdr, 3138 &in6addr_linklocal_allrouters); 3139 else 3140 goto put; 3141 3142 write_lock(&idev->lock); 3143 /* The wait after the last probe can be shorter */ 3144 addrconf_mod_rs_timer(idev, (idev->rs_probes == 3145 idev->cnf.rtr_solicits) ? 3146 idev->cnf.rtr_solicit_delay : 3147 idev->cnf.rtr_solicit_interval); 3148 } else { 3149 /* 3150 * Note: we do not support deprecated "all on-link" 3151 * assumption any longer. 3152 */ 3153 pr_debug("%s: no IPv6 routers present\n", idev->dev->name); 3154 } 3155 3156 out: 3157 write_unlock(&idev->lock); 3158 put: 3159 in6_dev_put(idev); 3160 } 3161 3162 /* 3163 * Duplicate Address Detection 3164 */ 3165 static void addrconf_dad_kick(struct inet6_ifaddr *ifp) 3166 { 3167 unsigned long rand_num; 3168 struct inet6_dev *idev = ifp->idev; 3169 3170 if (ifp->flags & IFA_F_OPTIMISTIC) 3171 rand_num = 0; 3172 else 3173 rand_num = prandom_u32() % (idev->cnf.rtr_solicit_delay ? : 1); 3174 3175 ifp->dad_probes = idev->cnf.dad_transmits; 3176 addrconf_mod_dad_work(ifp, rand_num); 3177 } 3178 3179 static void addrconf_dad_begin(struct inet6_ifaddr *ifp) 3180 { 3181 struct inet6_dev *idev = ifp->idev; 3182 struct net_device *dev = idev->dev; 3183 3184 addrconf_join_solict(dev, &ifp->addr); 3185 3186 prandom_seed((__force u32) ifp->addr.s6_addr32[3]); 3187 3188 read_lock_bh(&idev->lock); 3189 spin_lock(&ifp->lock); 3190 if (ifp->state == INET6_IFADDR_STATE_DEAD) 3191 goto out; 3192 3193 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) || 3194 idev->cnf.accept_dad < 1 || 3195 !(ifp->flags&IFA_F_TENTATIVE) || 3196 ifp->flags & IFA_F_NODAD) { 3197 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED); 3198 spin_unlock(&ifp->lock); 3199 read_unlock_bh(&idev->lock); 3200 3201 addrconf_dad_completed(ifp); 3202 return; 3203 } 3204 3205 if (!(idev->if_flags & IF_READY)) { 3206 spin_unlock(&ifp->lock); 3207 read_unlock_bh(&idev->lock); 3208 /* 3209 * If the device is not ready: 3210 * - keep it tentative if it is a permanent address. 3211 * - otherwise, kill it. 3212 */ 3213 in6_ifa_hold(ifp); 3214 addrconf_dad_stop(ifp, 0); 3215 return; 3216 } 3217 3218 /* 3219 * Optimistic nodes can start receiving 3220 * Frames right away 3221 */ 3222 if (ifp->flags & IFA_F_OPTIMISTIC) 3223 ip6_ins_rt(ifp->rt); 3224 3225 addrconf_dad_kick(ifp); 3226 out: 3227 spin_unlock(&ifp->lock); 3228 read_unlock_bh(&idev->lock); 3229 } 3230 3231 static void addrconf_dad_start(struct inet6_ifaddr *ifp) 3232 { 3233 bool begin_dad = false; 3234 3235 spin_lock_bh(&ifp->state_lock); 3236 if (ifp->state != INET6_IFADDR_STATE_DEAD) { 3237 ifp->state = INET6_IFADDR_STATE_PREDAD; 3238 begin_dad = true; 3239 } 3240 spin_unlock_bh(&ifp->state_lock); 3241 3242 if (begin_dad) 3243 addrconf_mod_dad_work(ifp, 0); 3244 } 3245 3246 static void addrconf_dad_work(struct work_struct *w) 3247 { 3248 struct inet6_ifaddr *ifp = container_of(to_delayed_work(w), 3249 struct inet6_ifaddr, 3250 dad_work); 3251 struct inet6_dev *idev = ifp->idev; 3252 struct in6_addr mcaddr; 3253 3254 enum { 3255 DAD_PROCESS, 3256 DAD_BEGIN, 3257 DAD_ABORT, 3258 } action = DAD_PROCESS; 3259 3260 rtnl_lock(); 3261 3262 spin_lock_bh(&ifp->state_lock); 3263 if (ifp->state == INET6_IFADDR_STATE_PREDAD) { 3264 action = DAD_BEGIN; 3265 ifp->state = INET6_IFADDR_STATE_DAD; 3266 } else if (ifp->state == INET6_IFADDR_STATE_ERRDAD) { 3267 action = DAD_ABORT; 3268 ifp->state = INET6_IFADDR_STATE_POSTDAD; 3269 } 3270 spin_unlock_bh(&ifp->state_lock); 3271 3272 if (action == DAD_BEGIN) { 3273 addrconf_dad_begin(ifp); 3274 goto out; 3275 } else if (action == DAD_ABORT) { 3276 addrconf_dad_stop(ifp, 1); 3277 goto out; 3278 } 3279 3280 if (!ifp->dad_probes && addrconf_dad_end(ifp)) 3281 goto out; 3282 3283 write_lock_bh(&idev->lock); 3284 if (idev->dead || !(idev->if_flags & IF_READY)) { 3285 write_unlock_bh(&idev->lock); 3286 goto out; 3287 } 3288 3289 spin_lock(&ifp->lock); 3290 if (ifp->state == INET6_IFADDR_STATE_DEAD) { 3291 spin_unlock(&ifp->lock); 3292 write_unlock_bh(&idev->lock); 3293 goto out; 3294 } 3295 3296 if (ifp->dad_probes == 0) { 3297 /* 3298 * DAD was successful 3299 */ 3300 3301 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED); 3302 spin_unlock(&ifp->lock); 3303 write_unlock_bh(&idev->lock); 3304 3305 addrconf_dad_completed(ifp); 3306 3307 goto out; 3308 } 3309 3310 ifp->dad_probes--; 3311 addrconf_mod_dad_work(ifp, 3312 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME)); 3313 spin_unlock(&ifp->lock); 3314 write_unlock_bh(&idev->lock); 3315 3316 /* send a neighbour solicitation for our addr */ 3317 addrconf_addr_solict_mult(&ifp->addr, &mcaddr); 3318 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &in6addr_any); 3319 out: 3320 in6_ifa_put(ifp); 3321 rtnl_unlock(); 3322 } 3323 3324 /* ifp->idev must be at least read locked */ 3325 static bool ipv6_lonely_lladdr(struct inet6_ifaddr *ifp) 3326 { 3327 struct inet6_ifaddr *ifpiter; 3328 struct inet6_dev *idev = ifp->idev; 3329 3330 list_for_each_entry_reverse(ifpiter, &idev->addr_list, if_list) { 3331 if (ifpiter->scope > IFA_LINK) 3332 break; 3333 if (ifp != ifpiter && ifpiter->scope == IFA_LINK && 3334 (ifpiter->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE| 3335 IFA_F_OPTIMISTIC|IFA_F_DADFAILED)) == 3336 IFA_F_PERMANENT) 3337 return false; 3338 } 3339 return true; 3340 } 3341 3342 static void addrconf_dad_completed(struct inet6_ifaddr *ifp) 3343 { 3344 struct net_device *dev = ifp->idev->dev; 3345 struct in6_addr lladdr; 3346 bool send_rs, send_mld; 3347 3348 addrconf_del_dad_work(ifp); 3349 3350 /* 3351 * Configure the address for reception. Now it is valid. 3352 */ 3353 3354 ipv6_ifa_notify(RTM_NEWADDR, ifp); 3355 3356 /* If added prefix is link local and we are prepared to process 3357 router advertisements, start sending router solicitations. 3358 */ 3359 3360 read_lock_bh(&ifp->idev->lock); 3361 send_mld = ifp->scope == IFA_LINK && ipv6_lonely_lladdr(ifp); 3362 send_rs = send_mld && 3363 ipv6_accept_ra(ifp->idev) && 3364 ifp->idev->cnf.rtr_solicits > 0 && 3365 (dev->flags&IFF_LOOPBACK) == 0; 3366 read_unlock_bh(&ifp->idev->lock); 3367 3368 /* While dad is in progress mld report's source address is in6_addrany. 3369 * Resend with proper ll now. 3370 */ 3371 if (send_mld) 3372 ipv6_mc_dad_complete(ifp->idev); 3373 3374 if (send_rs) { 3375 /* 3376 * If a host as already performed a random delay 3377 * [...] as part of DAD [...] there is no need 3378 * to delay again before sending the first RS 3379 */ 3380 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE)) 3381 return; 3382 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters); 3383 3384 write_lock_bh(&ifp->idev->lock); 3385 spin_lock(&ifp->lock); 3386 ifp->idev->rs_probes = 1; 3387 ifp->idev->if_flags |= IF_RS_SENT; 3388 addrconf_mod_rs_timer(ifp->idev, 3389 ifp->idev->cnf.rtr_solicit_interval); 3390 spin_unlock(&ifp->lock); 3391 write_unlock_bh(&ifp->idev->lock); 3392 } 3393 } 3394 3395 static void addrconf_dad_run(struct inet6_dev *idev) 3396 { 3397 struct inet6_ifaddr *ifp; 3398 3399 read_lock_bh(&idev->lock); 3400 list_for_each_entry(ifp, &idev->addr_list, if_list) { 3401 spin_lock(&ifp->lock); 3402 if (ifp->flags & IFA_F_TENTATIVE && 3403 ifp->state == INET6_IFADDR_STATE_DAD) 3404 addrconf_dad_kick(ifp); 3405 spin_unlock(&ifp->lock); 3406 } 3407 read_unlock_bh(&idev->lock); 3408 } 3409 3410 #ifdef CONFIG_PROC_FS 3411 struct if6_iter_state { 3412 struct seq_net_private p; 3413 int bucket; 3414 int offset; 3415 }; 3416 3417 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos) 3418 { 3419 struct inet6_ifaddr *ifa = NULL; 3420 struct if6_iter_state *state = seq->private; 3421 struct net *net = seq_file_net(seq); 3422 int p = 0; 3423 3424 /* initial bucket if pos is 0 */ 3425 if (pos == 0) { 3426 state->bucket = 0; 3427 state->offset = 0; 3428 } 3429 3430 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) { 3431 hlist_for_each_entry_rcu_bh(ifa, &inet6_addr_lst[state->bucket], 3432 addr_lst) { 3433 if (!net_eq(dev_net(ifa->idev->dev), net)) 3434 continue; 3435 /* sync with offset */ 3436 if (p < state->offset) { 3437 p++; 3438 continue; 3439 } 3440 state->offset++; 3441 return ifa; 3442 } 3443 3444 /* prepare for next bucket */ 3445 state->offset = 0; 3446 p = 0; 3447 } 3448 return NULL; 3449 } 3450 3451 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, 3452 struct inet6_ifaddr *ifa) 3453 { 3454 struct if6_iter_state *state = seq->private; 3455 struct net *net = seq_file_net(seq); 3456 3457 hlist_for_each_entry_continue_rcu_bh(ifa, addr_lst) { 3458 if (!net_eq(dev_net(ifa->idev->dev), net)) 3459 continue; 3460 state->offset++; 3461 return ifa; 3462 } 3463 3464 while (++state->bucket < IN6_ADDR_HSIZE) { 3465 state->offset = 0; 3466 hlist_for_each_entry_rcu_bh(ifa, 3467 &inet6_addr_lst[state->bucket], addr_lst) { 3468 if (!net_eq(dev_net(ifa->idev->dev), net)) 3469 continue; 3470 state->offset++; 3471 return ifa; 3472 } 3473 } 3474 3475 return NULL; 3476 } 3477 3478 static void *if6_seq_start(struct seq_file *seq, loff_t *pos) 3479 __acquires(rcu_bh) 3480 { 3481 rcu_read_lock_bh(); 3482 return if6_get_first(seq, *pos); 3483 } 3484 3485 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos) 3486 { 3487 struct inet6_ifaddr *ifa; 3488 3489 ifa = if6_get_next(seq, v); 3490 ++*pos; 3491 return ifa; 3492 } 3493 3494 static void if6_seq_stop(struct seq_file *seq, void *v) 3495 __releases(rcu_bh) 3496 { 3497 rcu_read_unlock_bh(); 3498 } 3499 3500 static int if6_seq_show(struct seq_file *seq, void *v) 3501 { 3502 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v; 3503 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n", 3504 &ifp->addr, 3505 ifp->idev->dev->ifindex, 3506 ifp->prefix_len, 3507 ifp->scope, 3508 (u8) ifp->flags, 3509 ifp->idev->dev->name); 3510 return 0; 3511 } 3512 3513 static const struct seq_operations if6_seq_ops = { 3514 .start = if6_seq_start, 3515 .next = if6_seq_next, 3516 .show = if6_seq_show, 3517 .stop = if6_seq_stop, 3518 }; 3519 3520 static int if6_seq_open(struct inode *inode, struct file *file) 3521 { 3522 return seq_open_net(inode, file, &if6_seq_ops, 3523 sizeof(struct if6_iter_state)); 3524 } 3525 3526 static const struct file_operations if6_fops = { 3527 .owner = THIS_MODULE, 3528 .open = if6_seq_open, 3529 .read = seq_read, 3530 .llseek = seq_lseek, 3531 .release = seq_release_net, 3532 }; 3533 3534 static int __net_init if6_proc_net_init(struct net *net) 3535 { 3536 if (!proc_create("if_inet6", S_IRUGO, net->proc_net, &if6_fops)) 3537 return -ENOMEM; 3538 return 0; 3539 } 3540 3541 static void __net_exit if6_proc_net_exit(struct net *net) 3542 { 3543 remove_proc_entry("if_inet6", net->proc_net); 3544 } 3545 3546 static struct pernet_operations if6_proc_net_ops = { 3547 .init = if6_proc_net_init, 3548 .exit = if6_proc_net_exit, 3549 }; 3550 3551 int __init if6_proc_init(void) 3552 { 3553 return register_pernet_subsys(&if6_proc_net_ops); 3554 } 3555 3556 void if6_proc_exit(void) 3557 { 3558 unregister_pernet_subsys(&if6_proc_net_ops); 3559 } 3560 #endif /* CONFIG_PROC_FS */ 3561 3562 #if IS_ENABLED(CONFIG_IPV6_MIP6) 3563 /* Check if address is a home address configured on any interface. */ 3564 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr) 3565 { 3566 int ret = 0; 3567 struct inet6_ifaddr *ifp = NULL; 3568 unsigned int hash = inet6_addr_hash(addr); 3569 3570 rcu_read_lock_bh(); 3571 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) { 3572 if (!net_eq(dev_net(ifp->idev->dev), net)) 3573 continue; 3574 if (ipv6_addr_equal(&ifp->addr, addr) && 3575 (ifp->flags & IFA_F_HOMEADDRESS)) { 3576 ret = 1; 3577 break; 3578 } 3579 } 3580 rcu_read_unlock_bh(); 3581 return ret; 3582 } 3583 #endif 3584 3585 /* 3586 * Periodic address status verification 3587 */ 3588 3589 static void addrconf_verify_rtnl(void) 3590 { 3591 unsigned long now, next, next_sec, next_sched; 3592 struct inet6_ifaddr *ifp; 3593 int i; 3594 3595 ASSERT_RTNL(); 3596 3597 rcu_read_lock_bh(); 3598 now = jiffies; 3599 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY); 3600 3601 cancel_delayed_work(&addr_chk_work); 3602 3603 for (i = 0; i < IN6_ADDR_HSIZE; i++) { 3604 restart: 3605 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[i], addr_lst) { 3606 unsigned long age; 3607 3608 /* When setting preferred_lft to a value not zero or 3609 * infinity, while valid_lft is infinity 3610 * IFA_F_PERMANENT has a non-infinity life time. 3611 */ 3612 if ((ifp->flags & IFA_F_PERMANENT) && 3613 (ifp->prefered_lft == INFINITY_LIFE_TIME)) 3614 continue; 3615 3616 spin_lock(&ifp->lock); 3617 /* We try to batch several events at once. */ 3618 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ; 3619 3620 if (ifp->valid_lft != INFINITY_LIFE_TIME && 3621 age >= ifp->valid_lft) { 3622 spin_unlock(&ifp->lock); 3623 in6_ifa_hold(ifp); 3624 ipv6_del_addr(ifp); 3625 goto restart; 3626 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) { 3627 spin_unlock(&ifp->lock); 3628 continue; 3629 } else if (age >= ifp->prefered_lft) { 3630 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */ 3631 int deprecate = 0; 3632 3633 if (!(ifp->flags&IFA_F_DEPRECATED)) { 3634 deprecate = 1; 3635 ifp->flags |= IFA_F_DEPRECATED; 3636 } 3637 3638 if ((ifp->valid_lft != INFINITY_LIFE_TIME) && 3639 (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))) 3640 next = ifp->tstamp + ifp->valid_lft * HZ; 3641 3642 spin_unlock(&ifp->lock); 3643 3644 if (deprecate) { 3645 in6_ifa_hold(ifp); 3646 3647 ipv6_ifa_notify(0, ifp); 3648 in6_ifa_put(ifp); 3649 goto restart; 3650 } 3651 } else if ((ifp->flags&IFA_F_TEMPORARY) && 3652 !(ifp->flags&IFA_F_TENTATIVE)) { 3653 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry * 3654 ifp->idev->cnf.dad_transmits * 3655 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME) / HZ; 3656 3657 if (age >= ifp->prefered_lft - regen_advance) { 3658 struct inet6_ifaddr *ifpub = ifp->ifpub; 3659 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 3660 next = ifp->tstamp + ifp->prefered_lft * HZ; 3661 if (!ifp->regen_count && ifpub) { 3662 ifp->regen_count++; 3663 in6_ifa_hold(ifp); 3664 in6_ifa_hold(ifpub); 3665 spin_unlock(&ifp->lock); 3666 3667 spin_lock(&ifpub->lock); 3668 ifpub->regen_count = 0; 3669 spin_unlock(&ifpub->lock); 3670 ipv6_create_tempaddr(ifpub, ifp); 3671 in6_ifa_put(ifpub); 3672 in6_ifa_put(ifp); 3673 goto restart; 3674 } 3675 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next)) 3676 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ; 3677 spin_unlock(&ifp->lock); 3678 } else { 3679 /* ifp->prefered_lft <= ifp->valid_lft */ 3680 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 3681 next = ifp->tstamp + ifp->prefered_lft * HZ; 3682 spin_unlock(&ifp->lock); 3683 } 3684 } 3685 } 3686 3687 next_sec = round_jiffies_up(next); 3688 next_sched = next; 3689 3690 /* If rounded timeout is accurate enough, accept it. */ 3691 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ)) 3692 next_sched = next_sec; 3693 3694 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */ 3695 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX)) 3696 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX; 3697 3698 ADBG(KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n", 3699 now, next, next_sec, next_sched); 3700 mod_delayed_work(addrconf_wq, &addr_chk_work, next_sched - now); 3701 rcu_read_unlock_bh(); 3702 } 3703 3704 static void addrconf_verify_work(struct work_struct *w) 3705 { 3706 rtnl_lock(); 3707 addrconf_verify_rtnl(); 3708 rtnl_unlock(); 3709 } 3710 3711 static void addrconf_verify(void) 3712 { 3713 mod_delayed_work(addrconf_wq, &addr_chk_work, 0); 3714 } 3715 3716 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local, 3717 struct in6_addr **peer_pfx) 3718 { 3719 struct in6_addr *pfx = NULL; 3720 3721 *peer_pfx = NULL; 3722 3723 if (addr) 3724 pfx = nla_data(addr); 3725 3726 if (local) { 3727 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx))) 3728 *peer_pfx = pfx; 3729 pfx = nla_data(local); 3730 } 3731 3732 return pfx; 3733 } 3734 3735 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = { 3736 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) }, 3737 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) }, 3738 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) }, 3739 [IFA_FLAGS] = { .len = sizeof(u32) }, 3740 }; 3741 3742 static int 3743 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh) 3744 { 3745 struct net *net = sock_net(skb->sk); 3746 struct ifaddrmsg *ifm; 3747 struct nlattr *tb[IFA_MAX+1]; 3748 struct in6_addr *pfx, *peer_pfx; 3749 u32 ifa_flags; 3750 int err; 3751 3752 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy); 3753 if (err < 0) 3754 return err; 3755 3756 ifm = nlmsg_data(nlh); 3757 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx); 3758 if (pfx == NULL) 3759 return -EINVAL; 3760 3761 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags; 3762 3763 /* We ignore other flags so far. */ 3764 ifa_flags &= IFA_F_MANAGETEMPADDR; 3765 3766 return inet6_addr_del(net, ifm->ifa_index, ifa_flags, pfx, 3767 ifm->ifa_prefixlen); 3768 } 3769 3770 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u32 ifa_flags, 3771 u32 prefered_lft, u32 valid_lft) 3772 { 3773 u32 flags; 3774 clock_t expires; 3775 unsigned long timeout; 3776 bool was_managetempaddr; 3777 bool had_prefixroute; 3778 3779 ASSERT_RTNL(); 3780 3781 if (!valid_lft || (prefered_lft > valid_lft)) 3782 return -EINVAL; 3783 3784 if (ifa_flags & IFA_F_MANAGETEMPADDR && 3785 (ifp->flags & IFA_F_TEMPORARY || ifp->prefix_len != 64)) 3786 return -EINVAL; 3787 3788 timeout = addrconf_timeout_fixup(valid_lft, HZ); 3789 if (addrconf_finite_timeout(timeout)) { 3790 expires = jiffies_to_clock_t(timeout * HZ); 3791 valid_lft = timeout; 3792 flags = RTF_EXPIRES; 3793 } else { 3794 expires = 0; 3795 flags = 0; 3796 ifa_flags |= IFA_F_PERMANENT; 3797 } 3798 3799 timeout = addrconf_timeout_fixup(prefered_lft, HZ); 3800 if (addrconf_finite_timeout(timeout)) { 3801 if (timeout == 0) 3802 ifa_flags |= IFA_F_DEPRECATED; 3803 prefered_lft = timeout; 3804 } 3805 3806 spin_lock_bh(&ifp->lock); 3807 was_managetempaddr = ifp->flags & IFA_F_MANAGETEMPADDR; 3808 had_prefixroute = ifp->flags & IFA_F_PERMANENT && 3809 !(ifp->flags & IFA_F_NOPREFIXROUTE); 3810 ifp->flags &= ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | 3811 IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR | 3812 IFA_F_NOPREFIXROUTE); 3813 ifp->flags |= ifa_flags; 3814 ifp->tstamp = jiffies; 3815 ifp->valid_lft = valid_lft; 3816 ifp->prefered_lft = prefered_lft; 3817 3818 spin_unlock_bh(&ifp->lock); 3819 if (!(ifp->flags&IFA_F_TENTATIVE)) 3820 ipv6_ifa_notify(0, ifp); 3821 3822 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) { 3823 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev, 3824 expires, flags); 3825 } else if (had_prefixroute) { 3826 enum cleanup_prefix_rt_t action; 3827 unsigned long rt_expires; 3828 3829 write_lock_bh(&ifp->idev->lock); 3830 action = check_cleanup_prefix_route(ifp, &rt_expires); 3831 write_unlock_bh(&ifp->idev->lock); 3832 3833 if (action != CLEANUP_PREFIX_RT_NOP) { 3834 cleanup_prefix_route(ifp, rt_expires, 3835 action == CLEANUP_PREFIX_RT_DEL); 3836 } 3837 } 3838 3839 if (was_managetempaddr || ifp->flags & IFA_F_MANAGETEMPADDR) { 3840 if (was_managetempaddr && !(ifp->flags & IFA_F_MANAGETEMPADDR)) 3841 valid_lft = prefered_lft = 0; 3842 manage_tempaddrs(ifp->idev, ifp, valid_lft, prefered_lft, 3843 !was_managetempaddr, jiffies); 3844 } 3845 3846 addrconf_verify_rtnl(); 3847 3848 return 0; 3849 } 3850 3851 static int 3852 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh) 3853 { 3854 struct net *net = sock_net(skb->sk); 3855 struct ifaddrmsg *ifm; 3856 struct nlattr *tb[IFA_MAX+1]; 3857 struct in6_addr *pfx, *peer_pfx; 3858 struct inet6_ifaddr *ifa; 3859 struct net_device *dev; 3860 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME; 3861 u32 ifa_flags; 3862 int err; 3863 3864 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy); 3865 if (err < 0) 3866 return err; 3867 3868 ifm = nlmsg_data(nlh); 3869 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx); 3870 if (pfx == NULL) 3871 return -EINVAL; 3872 3873 if (tb[IFA_CACHEINFO]) { 3874 struct ifa_cacheinfo *ci; 3875 3876 ci = nla_data(tb[IFA_CACHEINFO]); 3877 valid_lft = ci->ifa_valid; 3878 preferred_lft = ci->ifa_prefered; 3879 } else { 3880 preferred_lft = INFINITY_LIFE_TIME; 3881 valid_lft = INFINITY_LIFE_TIME; 3882 } 3883 3884 dev = __dev_get_by_index(net, ifm->ifa_index); 3885 if (dev == NULL) 3886 return -ENODEV; 3887 3888 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags; 3889 3890 /* We ignore other flags so far. */ 3891 ifa_flags &= IFA_F_NODAD | IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR | 3892 IFA_F_NOPREFIXROUTE; 3893 3894 ifa = ipv6_get_ifaddr(net, pfx, dev, 1); 3895 if (ifa == NULL) { 3896 /* 3897 * It would be best to check for !NLM_F_CREATE here but 3898 * userspace already relies on not having to provide this. 3899 */ 3900 return inet6_addr_add(net, ifm->ifa_index, pfx, peer_pfx, 3901 ifm->ifa_prefixlen, ifa_flags, 3902 preferred_lft, valid_lft); 3903 } 3904 3905 if (nlh->nlmsg_flags & NLM_F_EXCL || 3906 !(nlh->nlmsg_flags & NLM_F_REPLACE)) 3907 err = -EEXIST; 3908 else 3909 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft); 3910 3911 in6_ifa_put(ifa); 3912 3913 return err; 3914 } 3915 3916 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u32 flags, 3917 u8 scope, int ifindex) 3918 { 3919 struct ifaddrmsg *ifm; 3920 3921 ifm = nlmsg_data(nlh); 3922 ifm->ifa_family = AF_INET6; 3923 ifm->ifa_prefixlen = prefixlen; 3924 ifm->ifa_flags = flags; 3925 ifm->ifa_scope = scope; 3926 ifm->ifa_index = ifindex; 3927 } 3928 3929 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp, 3930 unsigned long tstamp, u32 preferred, u32 valid) 3931 { 3932 struct ifa_cacheinfo ci; 3933 3934 ci.cstamp = cstamp_delta(cstamp); 3935 ci.tstamp = cstamp_delta(tstamp); 3936 ci.ifa_prefered = preferred; 3937 ci.ifa_valid = valid; 3938 3939 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci); 3940 } 3941 3942 static inline int rt_scope(int ifa_scope) 3943 { 3944 if (ifa_scope & IFA_HOST) 3945 return RT_SCOPE_HOST; 3946 else if (ifa_scope & IFA_LINK) 3947 return RT_SCOPE_LINK; 3948 else if (ifa_scope & IFA_SITE) 3949 return RT_SCOPE_SITE; 3950 else 3951 return RT_SCOPE_UNIVERSE; 3952 } 3953 3954 static inline int inet6_ifaddr_msgsize(void) 3955 { 3956 return NLMSG_ALIGN(sizeof(struct ifaddrmsg)) 3957 + nla_total_size(16) /* IFA_LOCAL */ 3958 + nla_total_size(16) /* IFA_ADDRESS */ 3959 + nla_total_size(sizeof(struct ifa_cacheinfo)) 3960 + nla_total_size(4) /* IFA_FLAGS */; 3961 } 3962 3963 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa, 3964 u32 portid, u32 seq, int event, unsigned int flags) 3965 { 3966 struct nlmsghdr *nlh; 3967 u32 preferred, valid; 3968 3969 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags); 3970 if (nlh == NULL) 3971 return -EMSGSIZE; 3972 3973 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope), 3974 ifa->idev->dev->ifindex); 3975 3976 if (!((ifa->flags&IFA_F_PERMANENT) && 3977 (ifa->prefered_lft == INFINITY_LIFE_TIME))) { 3978 preferred = ifa->prefered_lft; 3979 valid = ifa->valid_lft; 3980 if (preferred != INFINITY_LIFE_TIME) { 3981 long tval = (jiffies - ifa->tstamp)/HZ; 3982 if (preferred > tval) 3983 preferred -= tval; 3984 else 3985 preferred = 0; 3986 if (valid != INFINITY_LIFE_TIME) { 3987 if (valid > tval) 3988 valid -= tval; 3989 else 3990 valid = 0; 3991 } 3992 } 3993 } else { 3994 preferred = INFINITY_LIFE_TIME; 3995 valid = INFINITY_LIFE_TIME; 3996 } 3997 3998 if (!ipv6_addr_any(&ifa->peer_addr)) { 3999 if (nla_put(skb, IFA_LOCAL, 16, &ifa->addr) < 0 || 4000 nla_put(skb, IFA_ADDRESS, 16, &ifa->peer_addr) < 0) 4001 goto error; 4002 } else 4003 if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0) 4004 goto error; 4005 4006 if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) 4007 goto error; 4008 4009 if (nla_put_u32(skb, IFA_FLAGS, ifa->flags) < 0) 4010 goto error; 4011 4012 return nlmsg_end(skb, nlh); 4013 4014 error: 4015 nlmsg_cancel(skb, nlh); 4016 return -EMSGSIZE; 4017 } 4018 4019 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca, 4020 u32 portid, u32 seq, int event, u16 flags) 4021 { 4022 struct nlmsghdr *nlh; 4023 u8 scope = RT_SCOPE_UNIVERSE; 4024 int ifindex = ifmca->idev->dev->ifindex; 4025 4026 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE) 4027 scope = RT_SCOPE_SITE; 4028 4029 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags); 4030 if (nlh == NULL) 4031 return -EMSGSIZE; 4032 4033 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 4034 if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 || 4035 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp, 4036 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 4037 nlmsg_cancel(skb, nlh); 4038 return -EMSGSIZE; 4039 } 4040 4041 return nlmsg_end(skb, nlh); 4042 } 4043 4044 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca, 4045 u32 portid, u32 seq, int event, unsigned int flags) 4046 { 4047 struct nlmsghdr *nlh; 4048 u8 scope = RT_SCOPE_UNIVERSE; 4049 int ifindex = ifaca->aca_idev->dev->ifindex; 4050 4051 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE) 4052 scope = RT_SCOPE_SITE; 4053 4054 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags); 4055 if (nlh == NULL) 4056 return -EMSGSIZE; 4057 4058 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 4059 if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 || 4060 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp, 4061 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 4062 nlmsg_cancel(skb, nlh); 4063 return -EMSGSIZE; 4064 } 4065 4066 return nlmsg_end(skb, nlh); 4067 } 4068 4069 enum addr_type_t { 4070 UNICAST_ADDR, 4071 MULTICAST_ADDR, 4072 ANYCAST_ADDR, 4073 }; 4074 4075 /* called with rcu_read_lock() */ 4076 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb, 4077 struct netlink_callback *cb, enum addr_type_t type, 4078 int s_ip_idx, int *p_ip_idx) 4079 { 4080 struct ifmcaddr6 *ifmca; 4081 struct ifacaddr6 *ifaca; 4082 int err = 1; 4083 int ip_idx = *p_ip_idx; 4084 4085 read_lock_bh(&idev->lock); 4086 switch (type) { 4087 case UNICAST_ADDR: { 4088 struct inet6_ifaddr *ifa; 4089 4090 /* unicast address incl. temp addr */ 4091 list_for_each_entry(ifa, &idev->addr_list, if_list) { 4092 if (++ip_idx < s_ip_idx) 4093 continue; 4094 err = inet6_fill_ifaddr(skb, ifa, 4095 NETLINK_CB(cb->skb).portid, 4096 cb->nlh->nlmsg_seq, 4097 RTM_NEWADDR, 4098 NLM_F_MULTI); 4099 if (err <= 0) 4100 break; 4101 nl_dump_check_consistent(cb, nlmsg_hdr(skb)); 4102 } 4103 break; 4104 } 4105 case MULTICAST_ADDR: 4106 /* multicast address */ 4107 for (ifmca = idev->mc_list; ifmca; 4108 ifmca = ifmca->next, ip_idx++) { 4109 if (ip_idx < s_ip_idx) 4110 continue; 4111 err = inet6_fill_ifmcaddr(skb, ifmca, 4112 NETLINK_CB(cb->skb).portid, 4113 cb->nlh->nlmsg_seq, 4114 RTM_GETMULTICAST, 4115 NLM_F_MULTI); 4116 if (err <= 0) 4117 break; 4118 } 4119 break; 4120 case ANYCAST_ADDR: 4121 /* anycast address */ 4122 for (ifaca = idev->ac_list; ifaca; 4123 ifaca = ifaca->aca_next, ip_idx++) { 4124 if (ip_idx < s_ip_idx) 4125 continue; 4126 err = inet6_fill_ifacaddr(skb, ifaca, 4127 NETLINK_CB(cb->skb).portid, 4128 cb->nlh->nlmsg_seq, 4129 RTM_GETANYCAST, 4130 NLM_F_MULTI); 4131 if (err <= 0) 4132 break; 4133 } 4134 break; 4135 default: 4136 break; 4137 } 4138 read_unlock_bh(&idev->lock); 4139 *p_ip_idx = ip_idx; 4140 return err; 4141 } 4142 4143 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb, 4144 enum addr_type_t type) 4145 { 4146 struct net *net = sock_net(skb->sk); 4147 int h, s_h; 4148 int idx, ip_idx; 4149 int s_idx, s_ip_idx; 4150 struct net_device *dev; 4151 struct inet6_dev *idev; 4152 struct hlist_head *head; 4153 4154 s_h = cb->args[0]; 4155 s_idx = idx = cb->args[1]; 4156 s_ip_idx = ip_idx = cb->args[2]; 4157 4158 rcu_read_lock(); 4159 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ net->dev_base_seq; 4160 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 4161 idx = 0; 4162 head = &net->dev_index_head[h]; 4163 hlist_for_each_entry_rcu(dev, head, index_hlist) { 4164 if (idx < s_idx) 4165 goto cont; 4166 if (h > s_h || idx > s_idx) 4167 s_ip_idx = 0; 4168 ip_idx = 0; 4169 idev = __in6_dev_get(dev); 4170 if (!idev) 4171 goto cont; 4172 4173 if (in6_dump_addrs(idev, skb, cb, type, 4174 s_ip_idx, &ip_idx) <= 0) 4175 goto done; 4176 cont: 4177 idx++; 4178 } 4179 } 4180 done: 4181 rcu_read_unlock(); 4182 cb->args[0] = h; 4183 cb->args[1] = idx; 4184 cb->args[2] = ip_idx; 4185 4186 return skb->len; 4187 } 4188 4189 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb) 4190 { 4191 enum addr_type_t type = UNICAST_ADDR; 4192 4193 return inet6_dump_addr(skb, cb, type); 4194 } 4195 4196 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb) 4197 { 4198 enum addr_type_t type = MULTICAST_ADDR; 4199 4200 return inet6_dump_addr(skb, cb, type); 4201 } 4202 4203 4204 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb) 4205 { 4206 enum addr_type_t type = ANYCAST_ADDR; 4207 4208 return inet6_dump_addr(skb, cb, type); 4209 } 4210 4211 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh) 4212 { 4213 struct net *net = sock_net(in_skb->sk); 4214 struct ifaddrmsg *ifm; 4215 struct nlattr *tb[IFA_MAX+1]; 4216 struct in6_addr *addr = NULL, *peer; 4217 struct net_device *dev = NULL; 4218 struct inet6_ifaddr *ifa; 4219 struct sk_buff *skb; 4220 int err; 4221 4222 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy); 4223 if (err < 0) 4224 goto errout; 4225 4226 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer); 4227 if (addr == NULL) { 4228 err = -EINVAL; 4229 goto errout; 4230 } 4231 4232 ifm = nlmsg_data(nlh); 4233 if (ifm->ifa_index) 4234 dev = __dev_get_by_index(net, ifm->ifa_index); 4235 4236 ifa = ipv6_get_ifaddr(net, addr, dev, 1); 4237 if (!ifa) { 4238 err = -EADDRNOTAVAIL; 4239 goto errout; 4240 } 4241 4242 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL); 4243 if (!skb) { 4244 err = -ENOBUFS; 4245 goto errout_ifa; 4246 } 4247 4248 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).portid, 4249 nlh->nlmsg_seq, RTM_NEWADDR, 0); 4250 if (err < 0) { 4251 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 4252 WARN_ON(err == -EMSGSIZE); 4253 kfree_skb(skb); 4254 goto errout_ifa; 4255 } 4256 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid); 4257 errout_ifa: 4258 in6_ifa_put(ifa); 4259 errout: 4260 return err; 4261 } 4262 4263 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa) 4264 { 4265 struct sk_buff *skb; 4266 struct net *net = dev_net(ifa->idev->dev); 4267 int err = -ENOBUFS; 4268 4269 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC); 4270 if (skb == NULL) 4271 goto errout; 4272 4273 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0); 4274 if (err < 0) { 4275 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 4276 WARN_ON(err == -EMSGSIZE); 4277 kfree_skb(skb); 4278 goto errout; 4279 } 4280 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC); 4281 return; 4282 errout: 4283 if (err < 0) 4284 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err); 4285 } 4286 4287 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf, 4288 __s32 *array, int bytes) 4289 { 4290 BUG_ON(bytes < (DEVCONF_MAX * 4)); 4291 4292 memset(array, 0, bytes); 4293 array[DEVCONF_FORWARDING] = cnf->forwarding; 4294 array[DEVCONF_HOPLIMIT] = cnf->hop_limit; 4295 array[DEVCONF_MTU6] = cnf->mtu6; 4296 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra; 4297 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects; 4298 array[DEVCONF_AUTOCONF] = cnf->autoconf; 4299 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits; 4300 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits; 4301 array[DEVCONF_RTR_SOLICIT_INTERVAL] = 4302 jiffies_to_msecs(cnf->rtr_solicit_interval); 4303 array[DEVCONF_RTR_SOLICIT_DELAY] = 4304 jiffies_to_msecs(cnf->rtr_solicit_delay); 4305 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version; 4306 array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] = 4307 jiffies_to_msecs(cnf->mldv1_unsolicited_report_interval); 4308 array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] = 4309 jiffies_to_msecs(cnf->mldv2_unsolicited_report_interval); 4310 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr; 4311 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft; 4312 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft; 4313 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry; 4314 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor; 4315 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses; 4316 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr; 4317 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo; 4318 #ifdef CONFIG_IPV6_ROUTER_PREF 4319 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref; 4320 array[DEVCONF_RTR_PROBE_INTERVAL] = 4321 jiffies_to_msecs(cnf->rtr_probe_interval); 4322 #ifdef CONFIG_IPV6_ROUTE_INFO 4323 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen; 4324 #endif 4325 #endif 4326 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp; 4327 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route; 4328 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 4329 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad; 4330 #endif 4331 #ifdef CONFIG_IPV6_MROUTE 4332 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding; 4333 #endif 4334 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6; 4335 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad; 4336 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao; 4337 array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify; 4338 array[DEVCONF_SUPPRESS_FRAG_NDISC] = cnf->suppress_frag_ndisc; 4339 array[DEVCONF_ACCEPT_RA_FROM_LOCAL] = cnf->accept_ra_from_local; 4340 } 4341 4342 static inline size_t inet6_ifla6_size(void) 4343 { 4344 return nla_total_size(4) /* IFLA_INET6_FLAGS */ 4345 + nla_total_size(sizeof(struct ifla_cacheinfo)) 4346 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */ 4347 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */ 4348 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */ 4349 + nla_total_size(sizeof(struct in6_addr)); /* IFLA_INET6_TOKEN */ 4350 } 4351 4352 static inline size_t inet6_if_nlmsg_size(void) 4353 { 4354 return NLMSG_ALIGN(sizeof(struct ifinfomsg)) 4355 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */ 4356 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */ 4357 + nla_total_size(4) /* IFLA_MTU */ 4358 + nla_total_size(4) /* IFLA_LINK */ 4359 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */ 4360 } 4361 4362 static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib, 4363 int items, int bytes) 4364 { 4365 int i; 4366 int pad = bytes - sizeof(u64) * items; 4367 BUG_ON(pad < 0); 4368 4369 /* Use put_unaligned() because stats may not be aligned for u64. */ 4370 put_unaligned(items, &stats[0]); 4371 for (i = 1; i < items; i++) 4372 put_unaligned(atomic_long_read(&mib[i]), &stats[i]); 4373 4374 memset(&stats[items], 0, pad); 4375 } 4376 4377 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu *mib, 4378 int items, int bytes, size_t syncpoff) 4379 { 4380 int i; 4381 int pad = bytes - sizeof(u64) * items; 4382 BUG_ON(pad < 0); 4383 4384 /* Use put_unaligned() because stats may not be aligned for u64. */ 4385 put_unaligned(items, &stats[0]); 4386 for (i = 1; i < items; i++) 4387 put_unaligned(snmp_fold_field64(mib, i, syncpoff), &stats[i]); 4388 4389 memset(&stats[items], 0, pad); 4390 } 4391 4392 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype, 4393 int bytes) 4394 { 4395 switch (attrtype) { 4396 case IFLA_INET6_STATS: 4397 __snmp6_fill_stats64(stats, idev->stats.ipv6, 4398 IPSTATS_MIB_MAX, bytes, offsetof(struct ipstats_mib, syncp)); 4399 break; 4400 case IFLA_INET6_ICMP6STATS: 4401 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, ICMP6_MIB_MAX, bytes); 4402 break; 4403 } 4404 } 4405 4406 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev) 4407 { 4408 struct nlattr *nla; 4409 struct ifla_cacheinfo ci; 4410 4411 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags)) 4412 goto nla_put_failure; 4413 ci.max_reasm_len = IPV6_MAXPLEN; 4414 ci.tstamp = cstamp_delta(idev->tstamp); 4415 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time); 4416 ci.retrans_time = jiffies_to_msecs(NEIGH_VAR(idev->nd_parms, RETRANS_TIME)); 4417 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci)) 4418 goto nla_put_failure; 4419 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32)); 4420 if (nla == NULL) 4421 goto nla_put_failure; 4422 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla)); 4423 4424 /* XXX - MC not implemented */ 4425 4426 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64)); 4427 if (nla == NULL) 4428 goto nla_put_failure; 4429 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla)); 4430 4431 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64)); 4432 if (nla == NULL) 4433 goto nla_put_failure; 4434 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla)); 4435 4436 nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr)); 4437 if (nla == NULL) 4438 goto nla_put_failure; 4439 4440 if (nla_put_u8(skb, IFLA_INET6_ADDR_GEN_MODE, idev->addr_gen_mode)) 4441 goto nla_put_failure; 4442 4443 read_lock_bh(&idev->lock); 4444 memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla)); 4445 read_unlock_bh(&idev->lock); 4446 4447 return 0; 4448 4449 nla_put_failure: 4450 return -EMSGSIZE; 4451 } 4452 4453 static size_t inet6_get_link_af_size(const struct net_device *dev) 4454 { 4455 if (!__in6_dev_get(dev)) 4456 return 0; 4457 4458 return inet6_ifla6_size(); 4459 } 4460 4461 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev) 4462 { 4463 struct inet6_dev *idev = __in6_dev_get(dev); 4464 4465 if (!idev) 4466 return -ENODATA; 4467 4468 if (inet6_fill_ifla6_attrs(skb, idev) < 0) 4469 return -EMSGSIZE; 4470 4471 return 0; 4472 } 4473 4474 static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token) 4475 { 4476 struct inet6_ifaddr *ifp; 4477 struct net_device *dev = idev->dev; 4478 bool update_rs = false; 4479 struct in6_addr ll_addr; 4480 4481 ASSERT_RTNL(); 4482 4483 if (token == NULL) 4484 return -EINVAL; 4485 if (ipv6_addr_any(token)) 4486 return -EINVAL; 4487 if (dev->flags & (IFF_LOOPBACK | IFF_NOARP)) 4488 return -EINVAL; 4489 if (!ipv6_accept_ra(idev)) 4490 return -EINVAL; 4491 if (idev->cnf.rtr_solicits <= 0) 4492 return -EINVAL; 4493 4494 write_lock_bh(&idev->lock); 4495 4496 BUILD_BUG_ON(sizeof(token->s6_addr) != 16); 4497 memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8); 4498 4499 write_unlock_bh(&idev->lock); 4500 4501 if (!idev->dead && (idev->if_flags & IF_READY) && 4502 !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE | 4503 IFA_F_OPTIMISTIC)) { 4504 4505 /* If we're not ready, then normal ifup will take care 4506 * of this. Otherwise, we need to request our rs here. 4507 */ 4508 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters); 4509 update_rs = true; 4510 } 4511 4512 write_lock_bh(&idev->lock); 4513 4514 if (update_rs) { 4515 idev->if_flags |= IF_RS_SENT; 4516 idev->rs_probes = 1; 4517 addrconf_mod_rs_timer(idev, idev->cnf.rtr_solicit_interval); 4518 } 4519 4520 /* Well, that's kinda nasty ... */ 4521 list_for_each_entry(ifp, &idev->addr_list, if_list) { 4522 spin_lock(&ifp->lock); 4523 if (ifp->tokenized) { 4524 ifp->valid_lft = 0; 4525 ifp->prefered_lft = 0; 4526 } 4527 spin_unlock(&ifp->lock); 4528 } 4529 4530 write_unlock_bh(&idev->lock); 4531 addrconf_verify_rtnl(); 4532 return 0; 4533 } 4534 4535 static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla) 4536 { 4537 int err = -EINVAL; 4538 struct inet6_dev *idev = __in6_dev_get(dev); 4539 struct nlattr *tb[IFLA_INET6_MAX + 1]; 4540 4541 if (!idev) 4542 return -EAFNOSUPPORT; 4543 4544 if (nla_parse_nested(tb, IFLA_INET6_MAX, nla, NULL) < 0) 4545 BUG(); 4546 4547 if (tb[IFLA_INET6_TOKEN]) { 4548 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN])); 4549 if (err) 4550 return err; 4551 } 4552 4553 if (tb[IFLA_INET6_ADDR_GEN_MODE]) { 4554 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]); 4555 4556 if (mode != IN6_ADDR_GEN_MODE_EUI64 && 4557 mode != IN6_ADDR_GEN_MODE_NONE) 4558 return -EINVAL; 4559 idev->addr_gen_mode = mode; 4560 err = 0; 4561 } 4562 4563 return err; 4564 } 4565 4566 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev, 4567 u32 portid, u32 seq, int event, unsigned int flags) 4568 { 4569 struct net_device *dev = idev->dev; 4570 struct ifinfomsg *hdr; 4571 struct nlmsghdr *nlh; 4572 void *protoinfo; 4573 4574 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags); 4575 if (nlh == NULL) 4576 return -EMSGSIZE; 4577 4578 hdr = nlmsg_data(nlh); 4579 hdr->ifi_family = AF_INET6; 4580 hdr->__ifi_pad = 0; 4581 hdr->ifi_type = dev->type; 4582 hdr->ifi_index = dev->ifindex; 4583 hdr->ifi_flags = dev_get_flags(dev); 4584 hdr->ifi_change = 0; 4585 4586 if (nla_put_string(skb, IFLA_IFNAME, dev->name) || 4587 (dev->addr_len && 4588 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) || 4589 nla_put_u32(skb, IFLA_MTU, dev->mtu) || 4590 (dev->ifindex != dev->iflink && 4591 nla_put_u32(skb, IFLA_LINK, dev->iflink))) 4592 goto nla_put_failure; 4593 protoinfo = nla_nest_start(skb, IFLA_PROTINFO); 4594 if (protoinfo == NULL) 4595 goto nla_put_failure; 4596 4597 if (inet6_fill_ifla6_attrs(skb, idev) < 0) 4598 goto nla_put_failure; 4599 4600 nla_nest_end(skb, protoinfo); 4601 return nlmsg_end(skb, nlh); 4602 4603 nla_put_failure: 4604 nlmsg_cancel(skb, nlh); 4605 return -EMSGSIZE; 4606 } 4607 4608 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb) 4609 { 4610 struct net *net = sock_net(skb->sk); 4611 int h, s_h; 4612 int idx = 0, s_idx; 4613 struct net_device *dev; 4614 struct inet6_dev *idev; 4615 struct hlist_head *head; 4616 4617 s_h = cb->args[0]; 4618 s_idx = cb->args[1]; 4619 4620 rcu_read_lock(); 4621 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 4622 idx = 0; 4623 head = &net->dev_index_head[h]; 4624 hlist_for_each_entry_rcu(dev, head, index_hlist) { 4625 if (idx < s_idx) 4626 goto cont; 4627 idev = __in6_dev_get(dev); 4628 if (!idev) 4629 goto cont; 4630 if (inet6_fill_ifinfo(skb, idev, 4631 NETLINK_CB(cb->skb).portid, 4632 cb->nlh->nlmsg_seq, 4633 RTM_NEWLINK, NLM_F_MULTI) <= 0) 4634 goto out; 4635 cont: 4636 idx++; 4637 } 4638 } 4639 out: 4640 rcu_read_unlock(); 4641 cb->args[1] = idx; 4642 cb->args[0] = h; 4643 4644 return skb->len; 4645 } 4646 4647 void inet6_ifinfo_notify(int event, struct inet6_dev *idev) 4648 { 4649 struct sk_buff *skb; 4650 struct net *net = dev_net(idev->dev); 4651 int err = -ENOBUFS; 4652 4653 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC); 4654 if (skb == NULL) 4655 goto errout; 4656 4657 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0); 4658 if (err < 0) { 4659 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */ 4660 WARN_ON(err == -EMSGSIZE); 4661 kfree_skb(skb); 4662 goto errout; 4663 } 4664 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC); 4665 return; 4666 errout: 4667 if (err < 0) 4668 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err); 4669 } 4670 4671 static inline size_t inet6_prefix_nlmsg_size(void) 4672 { 4673 return NLMSG_ALIGN(sizeof(struct prefixmsg)) 4674 + nla_total_size(sizeof(struct in6_addr)) 4675 + nla_total_size(sizeof(struct prefix_cacheinfo)); 4676 } 4677 4678 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev, 4679 struct prefix_info *pinfo, u32 portid, u32 seq, 4680 int event, unsigned int flags) 4681 { 4682 struct prefixmsg *pmsg; 4683 struct nlmsghdr *nlh; 4684 struct prefix_cacheinfo ci; 4685 4686 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags); 4687 if (nlh == NULL) 4688 return -EMSGSIZE; 4689 4690 pmsg = nlmsg_data(nlh); 4691 pmsg->prefix_family = AF_INET6; 4692 pmsg->prefix_pad1 = 0; 4693 pmsg->prefix_pad2 = 0; 4694 pmsg->prefix_ifindex = idev->dev->ifindex; 4695 pmsg->prefix_len = pinfo->prefix_len; 4696 pmsg->prefix_type = pinfo->type; 4697 pmsg->prefix_pad3 = 0; 4698 pmsg->prefix_flags = 0; 4699 if (pinfo->onlink) 4700 pmsg->prefix_flags |= IF_PREFIX_ONLINK; 4701 if (pinfo->autoconf) 4702 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF; 4703 4704 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix)) 4705 goto nla_put_failure; 4706 ci.preferred_time = ntohl(pinfo->prefered); 4707 ci.valid_time = ntohl(pinfo->valid); 4708 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci)) 4709 goto nla_put_failure; 4710 return nlmsg_end(skb, nlh); 4711 4712 nla_put_failure: 4713 nlmsg_cancel(skb, nlh); 4714 return -EMSGSIZE; 4715 } 4716 4717 static void inet6_prefix_notify(int event, struct inet6_dev *idev, 4718 struct prefix_info *pinfo) 4719 { 4720 struct sk_buff *skb; 4721 struct net *net = dev_net(idev->dev); 4722 int err = -ENOBUFS; 4723 4724 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC); 4725 if (skb == NULL) 4726 goto errout; 4727 4728 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0); 4729 if (err < 0) { 4730 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */ 4731 WARN_ON(err == -EMSGSIZE); 4732 kfree_skb(skb); 4733 goto errout; 4734 } 4735 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC); 4736 return; 4737 errout: 4738 if (err < 0) 4739 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err); 4740 } 4741 4742 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 4743 { 4744 struct net *net = dev_net(ifp->idev->dev); 4745 4746 if (event) 4747 ASSERT_RTNL(); 4748 4749 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp); 4750 4751 switch (event) { 4752 case RTM_NEWADDR: 4753 /* 4754 * If the address was optimistic 4755 * we inserted the route at the start of 4756 * our DAD process, so we don't need 4757 * to do it again 4758 */ 4759 if (!(ifp->rt->rt6i_node)) 4760 ip6_ins_rt(ifp->rt); 4761 if (ifp->idev->cnf.forwarding) 4762 addrconf_join_anycast(ifp); 4763 if (!ipv6_addr_any(&ifp->peer_addr)) 4764 addrconf_prefix_route(&ifp->peer_addr, 128, 4765 ifp->idev->dev, 0, 0); 4766 break; 4767 case RTM_DELADDR: 4768 if (ifp->idev->cnf.forwarding) 4769 addrconf_leave_anycast(ifp); 4770 addrconf_leave_solict(ifp->idev, &ifp->addr); 4771 if (!ipv6_addr_any(&ifp->peer_addr)) { 4772 struct rt6_info *rt; 4773 4774 rt = addrconf_get_prefix_route(&ifp->peer_addr, 128, 4775 ifp->idev->dev, 0, 0); 4776 if (rt && ip6_del_rt(rt)) 4777 dst_free(&rt->dst); 4778 } 4779 dst_hold(&ifp->rt->dst); 4780 4781 if (ip6_del_rt(ifp->rt)) 4782 dst_free(&ifp->rt->dst); 4783 4784 rt_genid_bump_ipv6(net); 4785 break; 4786 } 4787 atomic_inc(&net->ipv6.dev_addr_genid); 4788 } 4789 4790 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 4791 { 4792 rcu_read_lock_bh(); 4793 if (likely(ifp->idev->dead == 0)) 4794 __ipv6_ifa_notify(event, ifp); 4795 rcu_read_unlock_bh(); 4796 } 4797 4798 #ifdef CONFIG_SYSCTL 4799 4800 static 4801 int addrconf_sysctl_forward(struct ctl_table *ctl, int write, 4802 void __user *buffer, size_t *lenp, loff_t *ppos) 4803 { 4804 int *valp = ctl->data; 4805 int val = *valp; 4806 loff_t pos = *ppos; 4807 struct ctl_table lctl; 4808 int ret; 4809 4810 /* 4811 * ctl->data points to idev->cnf.forwarding, we should 4812 * not modify it until we get the rtnl lock. 4813 */ 4814 lctl = *ctl; 4815 lctl.data = &val; 4816 4817 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 4818 4819 if (write) 4820 ret = addrconf_fixup_forwarding(ctl, valp, val); 4821 if (ret) 4822 *ppos = pos; 4823 return ret; 4824 } 4825 4826 static void dev_disable_change(struct inet6_dev *idev) 4827 { 4828 struct netdev_notifier_info info; 4829 4830 if (!idev || !idev->dev) 4831 return; 4832 4833 netdev_notifier_info_init(&info, idev->dev); 4834 if (idev->cnf.disable_ipv6) 4835 addrconf_notify(NULL, NETDEV_DOWN, &info); 4836 else 4837 addrconf_notify(NULL, NETDEV_UP, &info); 4838 } 4839 4840 static void addrconf_disable_change(struct net *net, __s32 newf) 4841 { 4842 struct net_device *dev; 4843 struct inet6_dev *idev; 4844 4845 rcu_read_lock(); 4846 for_each_netdev_rcu(net, dev) { 4847 idev = __in6_dev_get(dev); 4848 if (idev) { 4849 int changed = (!idev->cnf.disable_ipv6) ^ (!newf); 4850 idev->cnf.disable_ipv6 = newf; 4851 if (changed) 4852 dev_disable_change(idev); 4853 } 4854 } 4855 rcu_read_unlock(); 4856 } 4857 4858 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf) 4859 { 4860 struct net *net; 4861 int old; 4862 4863 if (!rtnl_trylock()) 4864 return restart_syscall(); 4865 4866 net = (struct net *)table->extra2; 4867 old = *p; 4868 *p = newf; 4869 4870 if (p == &net->ipv6.devconf_dflt->disable_ipv6) { 4871 rtnl_unlock(); 4872 return 0; 4873 } 4874 4875 if (p == &net->ipv6.devconf_all->disable_ipv6) { 4876 net->ipv6.devconf_dflt->disable_ipv6 = newf; 4877 addrconf_disable_change(net, newf); 4878 } else if ((!newf) ^ (!old)) 4879 dev_disable_change((struct inet6_dev *)table->extra1); 4880 4881 rtnl_unlock(); 4882 return 0; 4883 } 4884 4885 static 4886 int addrconf_sysctl_disable(struct ctl_table *ctl, int write, 4887 void __user *buffer, size_t *lenp, loff_t *ppos) 4888 { 4889 int *valp = ctl->data; 4890 int val = *valp; 4891 loff_t pos = *ppos; 4892 struct ctl_table lctl; 4893 int ret; 4894 4895 /* 4896 * ctl->data points to idev->cnf.disable_ipv6, we should 4897 * not modify it until we get the rtnl lock. 4898 */ 4899 lctl = *ctl; 4900 lctl.data = &val; 4901 4902 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 4903 4904 if (write) 4905 ret = addrconf_disable_ipv6(ctl, valp, val); 4906 if (ret) 4907 *ppos = pos; 4908 return ret; 4909 } 4910 4911 static 4912 int addrconf_sysctl_proxy_ndp(struct ctl_table *ctl, int write, 4913 void __user *buffer, size_t *lenp, loff_t *ppos) 4914 { 4915 int *valp = ctl->data; 4916 int ret; 4917 int old, new; 4918 4919 old = *valp; 4920 ret = proc_dointvec(ctl, write, buffer, lenp, ppos); 4921 new = *valp; 4922 4923 if (write && old != new) { 4924 struct net *net = ctl->extra2; 4925 4926 if (!rtnl_trylock()) 4927 return restart_syscall(); 4928 4929 if (valp == &net->ipv6.devconf_dflt->proxy_ndp) 4930 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH, 4931 NETCONFA_IFINDEX_DEFAULT, 4932 net->ipv6.devconf_dflt); 4933 else if (valp == &net->ipv6.devconf_all->proxy_ndp) 4934 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH, 4935 NETCONFA_IFINDEX_ALL, 4936 net->ipv6.devconf_all); 4937 else { 4938 struct inet6_dev *idev = ctl->extra1; 4939 4940 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH, 4941 idev->dev->ifindex, 4942 &idev->cnf); 4943 } 4944 rtnl_unlock(); 4945 } 4946 4947 return ret; 4948 } 4949 4950 4951 static struct addrconf_sysctl_table 4952 { 4953 struct ctl_table_header *sysctl_header; 4954 struct ctl_table addrconf_vars[DEVCONF_MAX+1]; 4955 } addrconf_sysctl __read_mostly = { 4956 .sysctl_header = NULL, 4957 .addrconf_vars = { 4958 { 4959 .procname = "forwarding", 4960 .data = &ipv6_devconf.forwarding, 4961 .maxlen = sizeof(int), 4962 .mode = 0644, 4963 .proc_handler = addrconf_sysctl_forward, 4964 }, 4965 { 4966 .procname = "hop_limit", 4967 .data = &ipv6_devconf.hop_limit, 4968 .maxlen = sizeof(int), 4969 .mode = 0644, 4970 .proc_handler = proc_dointvec, 4971 }, 4972 { 4973 .procname = "mtu", 4974 .data = &ipv6_devconf.mtu6, 4975 .maxlen = sizeof(int), 4976 .mode = 0644, 4977 .proc_handler = proc_dointvec, 4978 }, 4979 { 4980 .procname = "accept_ra", 4981 .data = &ipv6_devconf.accept_ra, 4982 .maxlen = sizeof(int), 4983 .mode = 0644, 4984 .proc_handler = proc_dointvec, 4985 }, 4986 { 4987 .procname = "accept_redirects", 4988 .data = &ipv6_devconf.accept_redirects, 4989 .maxlen = sizeof(int), 4990 .mode = 0644, 4991 .proc_handler = proc_dointvec, 4992 }, 4993 { 4994 .procname = "autoconf", 4995 .data = &ipv6_devconf.autoconf, 4996 .maxlen = sizeof(int), 4997 .mode = 0644, 4998 .proc_handler = proc_dointvec, 4999 }, 5000 { 5001 .procname = "dad_transmits", 5002 .data = &ipv6_devconf.dad_transmits, 5003 .maxlen = sizeof(int), 5004 .mode = 0644, 5005 .proc_handler = proc_dointvec, 5006 }, 5007 { 5008 .procname = "router_solicitations", 5009 .data = &ipv6_devconf.rtr_solicits, 5010 .maxlen = sizeof(int), 5011 .mode = 0644, 5012 .proc_handler = proc_dointvec, 5013 }, 5014 { 5015 .procname = "router_solicitation_interval", 5016 .data = &ipv6_devconf.rtr_solicit_interval, 5017 .maxlen = sizeof(int), 5018 .mode = 0644, 5019 .proc_handler = proc_dointvec_jiffies, 5020 }, 5021 { 5022 .procname = "router_solicitation_delay", 5023 .data = &ipv6_devconf.rtr_solicit_delay, 5024 .maxlen = sizeof(int), 5025 .mode = 0644, 5026 .proc_handler = proc_dointvec_jiffies, 5027 }, 5028 { 5029 .procname = "force_mld_version", 5030 .data = &ipv6_devconf.force_mld_version, 5031 .maxlen = sizeof(int), 5032 .mode = 0644, 5033 .proc_handler = proc_dointvec, 5034 }, 5035 { 5036 .procname = "mldv1_unsolicited_report_interval", 5037 .data = 5038 &ipv6_devconf.mldv1_unsolicited_report_interval, 5039 .maxlen = sizeof(int), 5040 .mode = 0644, 5041 .proc_handler = proc_dointvec_ms_jiffies, 5042 }, 5043 { 5044 .procname = "mldv2_unsolicited_report_interval", 5045 .data = 5046 &ipv6_devconf.mldv2_unsolicited_report_interval, 5047 .maxlen = sizeof(int), 5048 .mode = 0644, 5049 .proc_handler = proc_dointvec_ms_jiffies, 5050 }, 5051 { 5052 .procname = "use_tempaddr", 5053 .data = &ipv6_devconf.use_tempaddr, 5054 .maxlen = sizeof(int), 5055 .mode = 0644, 5056 .proc_handler = proc_dointvec, 5057 }, 5058 { 5059 .procname = "temp_valid_lft", 5060 .data = &ipv6_devconf.temp_valid_lft, 5061 .maxlen = sizeof(int), 5062 .mode = 0644, 5063 .proc_handler = proc_dointvec, 5064 }, 5065 { 5066 .procname = "temp_prefered_lft", 5067 .data = &ipv6_devconf.temp_prefered_lft, 5068 .maxlen = sizeof(int), 5069 .mode = 0644, 5070 .proc_handler = proc_dointvec, 5071 }, 5072 { 5073 .procname = "regen_max_retry", 5074 .data = &ipv6_devconf.regen_max_retry, 5075 .maxlen = sizeof(int), 5076 .mode = 0644, 5077 .proc_handler = proc_dointvec, 5078 }, 5079 { 5080 .procname = "max_desync_factor", 5081 .data = &ipv6_devconf.max_desync_factor, 5082 .maxlen = sizeof(int), 5083 .mode = 0644, 5084 .proc_handler = proc_dointvec, 5085 }, 5086 { 5087 .procname = "max_addresses", 5088 .data = &ipv6_devconf.max_addresses, 5089 .maxlen = sizeof(int), 5090 .mode = 0644, 5091 .proc_handler = proc_dointvec, 5092 }, 5093 { 5094 .procname = "accept_ra_defrtr", 5095 .data = &ipv6_devconf.accept_ra_defrtr, 5096 .maxlen = sizeof(int), 5097 .mode = 0644, 5098 .proc_handler = proc_dointvec, 5099 }, 5100 { 5101 .procname = "accept_ra_pinfo", 5102 .data = &ipv6_devconf.accept_ra_pinfo, 5103 .maxlen = sizeof(int), 5104 .mode = 0644, 5105 .proc_handler = proc_dointvec, 5106 }, 5107 #ifdef CONFIG_IPV6_ROUTER_PREF 5108 { 5109 .procname = "accept_ra_rtr_pref", 5110 .data = &ipv6_devconf.accept_ra_rtr_pref, 5111 .maxlen = sizeof(int), 5112 .mode = 0644, 5113 .proc_handler = proc_dointvec, 5114 }, 5115 { 5116 .procname = "router_probe_interval", 5117 .data = &ipv6_devconf.rtr_probe_interval, 5118 .maxlen = sizeof(int), 5119 .mode = 0644, 5120 .proc_handler = proc_dointvec_jiffies, 5121 }, 5122 #ifdef CONFIG_IPV6_ROUTE_INFO 5123 { 5124 .procname = "accept_ra_rt_info_max_plen", 5125 .data = &ipv6_devconf.accept_ra_rt_info_max_plen, 5126 .maxlen = sizeof(int), 5127 .mode = 0644, 5128 .proc_handler = proc_dointvec, 5129 }, 5130 #endif 5131 #endif 5132 { 5133 .procname = "proxy_ndp", 5134 .data = &ipv6_devconf.proxy_ndp, 5135 .maxlen = sizeof(int), 5136 .mode = 0644, 5137 .proc_handler = addrconf_sysctl_proxy_ndp, 5138 }, 5139 { 5140 .procname = "accept_source_route", 5141 .data = &ipv6_devconf.accept_source_route, 5142 .maxlen = sizeof(int), 5143 .mode = 0644, 5144 .proc_handler = proc_dointvec, 5145 }, 5146 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 5147 { 5148 .procname = "optimistic_dad", 5149 .data = &ipv6_devconf.optimistic_dad, 5150 .maxlen = sizeof(int), 5151 .mode = 0644, 5152 .proc_handler = proc_dointvec, 5153 5154 }, 5155 #endif 5156 #ifdef CONFIG_IPV6_MROUTE 5157 { 5158 .procname = "mc_forwarding", 5159 .data = &ipv6_devconf.mc_forwarding, 5160 .maxlen = sizeof(int), 5161 .mode = 0444, 5162 .proc_handler = proc_dointvec, 5163 }, 5164 #endif 5165 { 5166 .procname = "disable_ipv6", 5167 .data = &ipv6_devconf.disable_ipv6, 5168 .maxlen = sizeof(int), 5169 .mode = 0644, 5170 .proc_handler = addrconf_sysctl_disable, 5171 }, 5172 { 5173 .procname = "accept_dad", 5174 .data = &ipv6_devconf.accept_dad, 5175 .maxlen = sizeof(int), 5176 .mode = 0644, 5177 .proc_handler = proc_dointvec, 5178 }, 5179 { 5180 .procname = "force_tllao", 5181 .data = &ipv6_devconf.force_tllao, 5182 .maxlen = sizeof(int), 5183 .mode = 0644, 5184 .proc_handler = proc_dointvec 5185 }, 5186 { 5187 .procname = "ndisc_notify", 5188 .data = &ipv6_devconf.ndisc_notify, 5189 .maxlen = sizeof(int), 5190 .mode = 0644, 5191 .proc_handler = proc_dointvec 5192 }, 5193 { 5194 .procname = "suppress_frag_ndisc", 5195 .data = &ipv6_devconf.suppress_frag_ndisc, 5196 .maxlen = sizeof(int), 5197 .mode = 0644, 5198 .proc_handler = proc_dointvec 5199 }, 5200 { 5201 .procname = "accept_ra_from_local", 5202 .data = &ipv6_devconf.accept_ra_from_local, 5203 .maxlen = sizeof(int), 5204 .mode = 0644, 5205 .proc_handler = proc_dointvec, 5206 }, 5207 { 5208 /* sentinel */ 5209 } 5210 }, 5211 }; 5212 5213 static int __addrconf_sysctl_register(struct net *net, char *dev_name, 5214 struct inet6_dev *idev, struct ipv6_devconf *p) 5215 { 5216 int i; 5217 struct addrconf_sysctl_table *t; 5218 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ]; 5219 5220 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL); 5221 if (t == NULL) 5222 goto out; 5223 5224 for (i = 0; t->addrconf_vars[i].data; i++) { 5225 t->addrconf_vars[i].data += (char *)p - (char *)&ipv6_devconf; 5226 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */ 5227 t->addrconf_vars[i].extra2 = net; 5228 } 5229 5230 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name); 5231 5232 t->sysctl_header = register_net_sysctl(net, path, t->addrconf_vars); 5233 if (t->sysctl_header == NULL) 5234 goto free; 5235 5236 p->sysctl = t; 5237 return 0; 5238 5239 free: 5240 kfree(t); 5241 out: 5242 return -ENOBUFS; 5243 } 5244 5245 static void __addrconf_sysctl_unregister(struct ipv6_devconf *p) 5246 { 5247 struct addrconf_sysctl_table *t; 5248 5249 if (p->sysctl == NULL) 5250 return; 5251 5252 t = p->sysctl; 5253 p->sysctl = NULL; 5254 unregister_net_sysctl_table(t->sysctl_header); 5255 kfree(t); 5256 } 5257 5258 static int addrconf_sysctl_register(struct inet6_dev *idev) 5259 { 5260 int err; 5261 5262 if (!sysctl_dev_name_is_allowed(idev->dev->name)) 5263 return -EINVAL; 5264 5265 err = neigh_sysctl_register(idev->dev, idev->nd_parms, 5266 &ndisc_ifinfo_sysctl_change); 5267 if (err) 5268 return err; 5269 err = __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name, 5270 idev, &idev->cnf); 5271 if (err) 5272 neigh_sysctl_unregister(idev->nd_parms); 5273 5274 return err; 5275 } 5276 5277 static void addrconf_sysctl_unregister(struct inet6_dev *idev) 5278 { 5279 __addrconf_sysctl_unregister(&idev->cnf); 5280 neigh_sysctl_unregister(idev->nd_parms); 5281 } 5282 5283 5284 #endif 5285 5286 static int __net_init addrconf_init_net(struct net *net) 5287 { 5288 int err = -ENOMEM; 5289 struct ipv6_devconf *all, *dflt; 5290 5291 all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL); 5292 if (all == NULL) 5293 goto err_alloc_all; 5294 5295 dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL); 5296 if (dflt == NULL) 5297 goto err_alloc_dflt; 5298 5299 /* these will be inherited by all namespaces */ 5300 dflt->autoconf = ipv6_defaults.autoconf; 5301 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6; 5302 5303 net->ipv6.devconf_all = all; 5304 net->ipv6.devconf_dflt = dflt; 5305 5306 #ifdef CONFIG_SYSCTL 5307 err = __addrconf_sysctl_register(net, "all", NULL, all); 5308 if (err < 0) 5309 goto err_reg_all; 5310 5311 err = __addrconf_sysctl_register(net, "default", NULL, dflt); 5312 if (err < 0) 5313 goto err_reg_dflt; 5314 #endif 5315 return 0; 5316 5317 #ifdef CONFIG_SYSCTL 5318 err_reg_dflt: 5319 __addrconf_sysctl_unregister(all); 5320 err_reg_all: 5321 kfree(dflt); 5322 #endif 5323 err_alloc_dflt: 5324 kfree(all); 5325 err_alloc_all: 5326 return err; 5327 } 5328 5329 static void __net_exit addrconf_exit_net(struct net *net) 5330 { 5331 #ifdef CONFIG_SYSCTL 5332 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt); 5333 __addrconf_sysctl_unregister(net->ipv6.devconf_all); 5334 #endif 5335 if (!net_eq(net, &init_net)) { 5336 kfree(net->ipv6.devconf_dflt); 5337 kfree(net->ipv6.devconf_all); 5338 } 5339 } 5340 5341 static struct pernet_operations addrconf_ops = { 5342 .init = addrconf_init_net, 5343 .exit = addrconf_exit_net, 5344 }; 5345 5346 static struct rtnl_af_ops inet6_ops = { 5347 .family = AF_INET6, 5348 .fill_link_af = inet6_fill_link_af, 5349 .get_link_af_size = inet6_get_link_af_size, 5350 .set_link_af = inet6_set_link_af, 5351 }; 5352 5353 /* 5354 * Init / cleanup code 5355 */ 5356 5357 int __init addrconf_init(void) 5358 { 5359 struct inet6_dev *idev; 5360 int i, err; 5361 5362 err = ipv6_addr_label_init(); 5363 if (err < 0) { 5364 pr_crit("%s: cannot initialize default policy table: %d\n", 5365 __func__, err); 5366 goto out; 5367 } 5368 5369 err = register_pernet_subsys(&addrconf_ops); 5370 if (err < 0) 5371 goto out_addrlabel; 5372 5373 addrconf_wq = create_workqueue("ipv6_addrconf"); 5374 if (!addrconf_wq) { 5375 err = -ENOMEM; 5376 goto out_nowq; 5377 } 5378 5379 /* The addrconf netdev notifier requires that loopback_dev 5380 * has it's ipv6 private information allocated and setup 5381 * before it can bring up and give link-local addresses 5382 * to other devices which are up. 5383 * 5384 * Unfortunately, loopback_dev is not necessarily the first 5385 * entry in the global dev_base list of net devices. In fact, 5386 * it is likely to be the very last entry on that list. 5387 * So this causes the notifier registry below to try and 5388 * give link-local addresses to all devices besides loopback_dev 5389 * first, then loopback_dev, which cases all the non-loopback_dev 5390 * devices to fail to get a link-local address. 5391 * 5392 * So, as a temporary fix, allocate the ipv6 structure for 5393 * loopback_dev first by hand. 5394 * Longer term, all of the dependencies ipv6 has upon the loopback 5395 * device and it being up should be removed. 5396 */ 5397 rtnl_lock(); 5398 idev = ipv6_add_dev(init_net.loopback_dev); 5399 rtnl_unlock(); 5400 if (IS_ERR(idev)) { 5401 err = PTR_ERR(idev); 5402 goto errlo; 5403 } 5404 5405 for (i = 0; i < IN6_ADDR_HSIZE; i++) 5406 INIT_HLIST_HEAD(&inet6_addr_lst[i]); 5407 5408 register_netdevice_notifier(&ipv6_dev_notf); 5409 5410 addrconf_verify(); 5411 5412 rtnl_af_register(&inet6_ops); 5413 5414 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo, 5415 NULL); 5416 if (err < 0) 5417 goto errout; 5418 5419 /* Only the first call to __rtnl_register can fail */ 5420 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL, NULL); 5421 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL, NULL); 5422 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr, 5423 inet6_dump_ifaddr, NULL); 5424 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL, 5425 inet6_dump_ifmcaddr, NULL); 5426 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL, 5427 inet6_dump_ifacaddr, NULL); 5428 __rtnl_register(PF_INET6, RTM_GETNETCONF, inet6_netconf_get_devconf, 5429 inet6_netconf_dump_devconf, NULL); 5430 5431 ipv6_addr_label_rtnl_register(); 5432 5433 return 0; 5434 errout: 5435 rtnl_af_unregister(&inet6_ops); 5436 unregister_netdevice_notifier(&ipv6_dev_notf); 5437 errlo: 5438 destroy_workqueue(addrconf_wq); 5439 out_nowq: 5440 unregister_pernet_subsys(&addrconf_ops); 5441 out_addrlabel: 5442 ipv6_addr_label_cleanup(); 5443 out: 5444 return err; 5445 } 5446 5447 void addrconf_cleanup(void) 5448 { 5449 struct net_device *dev; 5450 int i; 5451 5452 unregister_netdevice_notifier(&ipv6_dev_notf); 5453 unregister_pernet_subsys(&addrconf_ops); 5454 ipv6_addr_label_cleanup(); 5455 5456 rtnl_lock(); 5457 5458 __rtnl_af_unregister(&inet6_ops); 5459 5460 /* clean dev list */ 5461 for_each_netdev(&init_net, dev) { 5462 if (__in6_dev_get(dev) == NULL) 5463 continue; 5464 addrconf_ifdown(dev, 1); 5465 } 5466 addrconf_ifdown(init_net.loopback_dev, 2); 5467 5468 /* 5469 * Check hash table. 5470 */ 5471 spin_lock_bh(&addrconf_hash_lock); 5472 for (i = 0; i < IN6_ADDR_HSIZE; i++) 5473 WARN_ON(!hlist_empty(&inet6_addr_lst[i])); 5474 spin_unlock_bh(&addrconf_hash_lock); 5475 cancel_delayed_work(&addr_chk_work); 5476 rtnl_unlock(); 5477 5478 destroy_workqueue(addrconf_wq); 5479 } 5480