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 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1174 IPV6_SADDR_RULE_NOT_OPTIMISTIC, 1175 #endif 1176 IPV6_SADDR_RULE_MAX 1177 }; 1178 1179 struct ipv6_saddr_score { 1180 int rule; 1181 int addr_type; 1182 struct inet6_ifaddr *ifa; 1183 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX); 1184 int scopedist; 1185 int matchlen; 1186 }; 1187 1188 struct ipv6_saddr_dst { 1189 const struct in6_addr *addr; 1190 int ifindex; 1191 int scope; 1192 int label; 1193 unsigned int prefs; 1194 }; 1195 1196 static inline int ipv6_saddr_preferred(int type) 1197 { 1198 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK)) 1199 return 1; 1200 return 0; 1201 } 1202 1203 static inline bool ipv6_use_optimistic_addr(struct inet6_dev *idev) 1204 { 1205 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1206 return idev && idev->cnf.optimistic_dad && idev->cnf.use_optimistic; 1207 #else 1208 return false; 1209 #endif 1210 } 1211 1212 static int ipv6_get_saddr_eval(struct net *net, 1213 struct ipv6_saddr_score *score, 1214 struct ipv6_saddr_dst *dst, 1215 int i) 1216 { 1217 int ret; 1218 1219 if (i <= score->rule) { 1220 switch (i) { 1221 case IPV6_SADDR_RULE_SCOPE: 1222 ret = score->scopedist; 1223 break; 1224 case IPV6_SADDR_RULE_PREFIX: 1225 ret = score->matchlen; 1226 break; 1227 default: 1228 ret = !!test_bit(i, score->scorebits); 1229 } 1230 goto out; 1231 } 1232 1233 switch (i) { 1234 case IPV6_SADDR_RULE_INIT: 1235 /* Rule 0: remember if hiscore is not ready yet */ 1236 ret = !!score->ifa; 1237 break; 1238 case IPV6_SADDR_RULE_LOCAL: 1239 /* Rule 1: Prefer same address */ 1240 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr); 1241 break; 1242 case IPV6_SADDR_RULE_SCOPE: 1243 /* Rule 2: Prefer appropriate scope 1244 * 1245 * ret 1246 * ^ 1247 * -1 | d 15 1248 * ---+--+-+---> scope 1249 * | 1250 * | d is scope of the destination. 1251 * B-d | \ 1252 * | \ <- smaller scope is better if 1253 * B-15 | \ if scope is enough for destination. 1254 * | ret = B - scope (-1 <= scope >= d <= 15). 1255 * d-C-1 | / 1256 * |/ <- greater is better 1257 * -C / if scope is not enough for destination. 1258 * /| ret = scope - C (-1 <= d < scope <= 15). 1259 * 1260 * d - C - 1 < B -15 (for all -1 <= d <= 15). 1261 * C > d + 14 - B >= 15 + 14 - B = 29 - B. 1262 * Assume B = 0 and we get C > 29. 1263 */ 1264 ret = __ipv6_addr_src_scope(score->addr_type); 1265 if (ret >= dst->scope) 1266 ret = -ret; 1267 else 1268 ret -= 128; /* 30 is enough */ 1269 score->scopedist = ret; 1270 break; 1271 case IPV6_SADDR_RULE_PREFERRED: 1272 { 1273 /* Rule 3: Avoid deprecated and optimistic addresses */ 1274 u8 avoid = IFA_F_DEPRECATED; 1275 1276 if (!ipv6_use_optimistic_addr(score->ifa->idev)) 1277 avoid |= IFA_F_OPTIMISTIC; 1278 ret = ipv6_saddr_preferred(score->addr_type) || 1279 !(score->ifa->flags & avoid); 1280 break; 1281 } 1282 #ifdef CONFIG_IPV6_MIP6 1283 case IPV6_SADDR_RULE_HOA: 1284 { 1285 /* Rule 4: Prefer home address */ 1286 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA); 1287 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome; 1288 break; 1289 } 1290 #endif 1291 case IPV6_SADDR_RULE_OIF: 1292 /* Rule 5: Prefer outgoing interface */ 1293 ret = (!dst->ifindex || 1294 dst->ifindex == score->ifa->idev->dev->ifindex); 1295 break; 1296 case IPV6_SADDR_RULE_LABEL: 1297 /* Rule 6: Prefer matching label */ 1298 ret = ipv6_addr_label(net, 1299 &score->ifa->addr, score->addr_type, 1300 score->ifa->idev->dev->ifindex) == dst->label; 1301 break; 1302 case IPV6_SADDR_RULE_PRIVACY: 1303 { 1304 /* Rule 7: Prefer public address 1305 * Note: prefer temporary address if use_tempaddr >= 2 1306 */ 1307 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ? 1308 !!(dst->prefs & IPV6_PREFER_SRC_TMP) : 1309 score->ifa->idev->cnf.use_tempaddr >= 2; 1310 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp; 1311 break; 1312 } 1313 case IPV6_SADDR_RULE_ORCHID: 1314 /* Rule 8-: Prefer ORCHID vs ORCHID or 1315 * non-ORCHID vs non-ORCHID 1316 */ 1317 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^ 1318 ipv6_addr_orchid(dst->addr)); 1319 break; 1320 case IPV6_SADDR_RULE_PREFIX: 1321 /* Rule 8: Use longest matching prefix */ 1322 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr); 1323 if (ret > score->ifa->prefix_len) 1324 ret = score->ifa->prefix_len; 1325 score->matchlen = ret; 1326 break; 1327 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1328 case IPV6_SADDR_RULE_NOT_OPTIMISTIC: 1329 /* Optimistic addresses still have lower precedence than other 1330 * preferred addresses. 1331 */ 1332 ret = !(score->ifa->flags & IFA_F_OPTIMISTIC); 1333 break; 1334 #endif 1335 default: 1336 ret = 0; 1337 } 1338 1339 if (ret) 1340 __set_bit(i, score->scorebits); 1341 score->rule = i; 1342 out: 1343 return ret; 1344 } 1345 1346 int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev, 1347 const struct in6_addr *daddr, unsigned int prefs, 1348 struct in6_addr *saddr) 1349 { 1350 struct ipv6_saddr_score scores[2], 1351 *score = &scores[0], *hiscore = &scores[1]; 1352 struct ipv6_saddr_dst dst; 1353 struct net_device *dev; 1354 int dst_type; 1355 1356 dst_type = __ipv6_addr_type(daddr); 1357 dst.addr = daddr; 1358 dst.ifindex = dst_dev ? dst_dev->ifindex : 0; 1359 dst.scope = __ipv6_addr_src_scope(dst_type); 1360 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex); 1361 dst.prefs = prefs; 1362 1363 hiscore->rule = -1; 1364 hiscore->ifa = NULL; 1365 1366 rcu_read_lock(); 1367 1368 for_each_netdev_rcu(net, dev) { 1369 struct inet6_dev *idev; 1370 1371 /* Candidate Source Address (section 4) 1372 * - multicast and link-local destination address, 1373 * the set of candidate source address MUST only 1374 * include addresses assigned to interfaces 1375 * belonging to the same link as the outgoing 1376 * interface. 1377 * (- For site-local destination addresses, the 1378 * set of candidate source addresses MUST only 1379 * include addresses assigned to interfaces 1380 * belonging to the same site as the outgoing 1381 * interface.) 1382 */ 1383 if (((dst_type & IPV6_ADDR_MULTICAST) || 1384 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL) && 1385 dst.ifindex && dev->ifindex != dst.ifindex) 1386 continue; 1387 1388 idev = __in6_dev_get(dev); 1389 if (!idev) 1390 continue; 1391 1392 read_lock_bh(&idev->lock); 1393 list_for_each_entry(score->ifa, &idev->addr_list, if_list) { 1394 int i; 1395 1396 /* 1397 * - Tentative Address (RFC2462 section 5.4) 1398 * - A tentative address is not considered 1399 * "assigned to an interface" in the traditional 1400 * sense, unless it is also flagged as optimistic. 1401 * - Candidate Source Address (section 4) 1402 * - In any case, anycast addresses, multicast 1403 * addresses, and the unspecified address MUST 1404 * NOT be included in a candidate set. 1405 */ 1406 if ((score->ifa->flags & IFA_F_TENTATIVE) && 1407 (!(score->ifa->flags & IFA_F_OPTIMISTIC))) 1408 continue; 1409 1410 score->addr_type = __ipv6_addr_type(&score->ifa->addr); 1411 1412 if (unlikely(score->addr_type == IPV6_ADDR_ANY || 1413 score->addr_type & IPV6_ADDR_MULTICAST)) { 1414 net_dbg_ratelimited("ADDRCONF: unspecified / multicast address assigned as unicast address on %s", 1415 dev->name); 1416 continue; 1417 } 1418 1419 score->rule = -1; 1420 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX); 1421 1422 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) { 1423 int minihiscore, miniscore; 1424 1425 minihiscore = ipv6_get_saddr_eval(net, hiscore, &dst, i); 1426 miniscore = ipv6_get_saddr_eval(net, score, &dst, i); 1427 1428 if (minihiscore > miniscore) { 1429 if (i == IPV6_SADDR_RULE_SCOPE && 1430 score->scopedist > 0) { 1431 /* 1432 * special case: 1433 * each remaining entry 1434 * has too small (not enough) 1435 * scope, because ifa entries 1436 * are sorted by their scope 1437 * values. 1438 */ 1439 goto try_nextdev; 1440 } 1441 break; 1442 } else if (minihiscore < miniscore) { 1443 if (hiscore->ifa) 1444 in6_ifa_put(hiscore->ifa); 1445 1446 in6_ifa_hold(score->ifa); 1447 1448 swap(hiscore, score); 1449 1450 /* restore our iterator */ 1451 score->ifa = hiscore->ifa; 1452 1453 break; 1454 } 1455 } 1456 } 1457 try_nextdev: 1458 read_unlock_bh(&idev->lock); 1459 } 1460 rcu_read_unlock(); 1461 1462 if (!hiscore->ifa) 1463 return -EADDRNOTAVAIL; 1464 1465 *saddr = hiscore->ifa->addr; 1466 in6_ifa_put(hiscore->ifa); 1467 return 0; 1468 } 1469 EXPORT_SYMBOL(ipv6_dev_get_saddr); 1470 1471 int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr, 1472 u32 banned_flags) 1473 { 1474 struct inet6_ifaddr *ifp; 1475 int err = -EADDRNOTAVAIL; 1476 1477 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) { 1478 if (ifp->scope > IFA_LINK) 1479 break; 1480 if (ifp->scope == IFA_LINK && 1481 !(ifp->flags & banned_flags)) { 1482 *addr = ifp->addr; 1483 err = 0; 1484 break; 1485 } 1486 } 1487 return err; 1488 } 1489 1490 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr, 1491 u32 banned_flags) 1492 { 1493 struct inet6_dev *idev; 1494 int err = -EADDRNOTAVAIL; 1495 1496 rcu_read_lock(); 1497 idev = __in6_dev_get(dev); 1498 if (idev) { 1499 read_lock_bh(&idev->lock); 1500 err = __ipv6_get_lladdr(idev, addr, banned_flags); 1501 read_unlock_bh(&idev->lock); 1502 } 1503 rcu_read_unlock(); 1504 return err; 1505 } 1506 1507 static int ipv6_count_addresses(struct inet6_dev *idev) 1508 { 1509 int cnt = 0; 1510 struct inet6_ifaddr *ifp; 1511 1512 read_lock_bh(&idev->lock); 1513 list_for_each_entry(ifp, &idev->addr_list, if_list) 1514 cnt++; 1515 read_unlock_bh(&idev->lock); 1516 return cnt; 1517 } 1518 1519 int ipv6_chk_addr(struct net *net, const struct in6_addr *addr, 1520 const struct net_device *dev, int strict) 1521 { 1522 struct inet6_ifaddr *ifp; 1523 unsigned int hash = inet6_addr_hash(addr); 1524 1525 rcu_read_lock_bh(); 1526 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) { 1527 if (!net_eq(dev_net(ifp->idev->dev), net)) 1528 continue; 1529 if (ipv6_addr_equal(&ifp->addr, addr) && 1530 !(ifp->flags&IFA_F_TENTATIVE) && 1531 (dev == NULL || ifp->idev->dev == dev || 1532 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) { 1533 rcu_read_unlock_bh(); 1534 return 1; 1535 } 1536 } 1537 1538 rcu_read_unlock_bh(); 1539 return 0; 1540 } 1541 EXPORT_SYMBOL(ipv6_chk_addr); 1542 1543 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr, 1544 struct net_device *dev) 1545 { 1546 unsigned int hash = inet6_addr_hash(addr); 1547 struct inet6_ifaddr *ifp; 1548 1549 hlist_for_each_entry(ifp, &inet6_addr_lst[hash], addr_lst) { 1550 if (!net_eq(dev_net(ifp->idev->dev), net)) 1551 continue; 1552 if (ipv6_addr_equal(&ifp->addr, addr)) { 1553 if (dev == NULL || ifp->idev->dev == dev) 1554 return true; 1555 } 1556 } 1557 return false; 1558 } 1559 1560 /* Compares an address/prefix_len with addresses on device @dev. 1561 * If one is found it returns true. 1562 */ 1563 bool ipv6_chk_custom_prefix(const struct in6_addr *addr, 1564 const unsigned int prefix_len, struct net_device *dev) 1565 { 1566 struct inet6_dev *idev; 1567 struct inet6_ifaddr *ifa; 1568 bool ret = false; 1569 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 ret = ipv6_prefix_equal(addr, &ifa->addr, prefix_len); 1576 if (ret) 1577 break; 1578 } 1579 read_unlock_bh(&idev->lock); 1580 } 1581 rcu_read_unlock(); 1582 1583 return ret; 1584 } 1585 EXPORT_SYMBOL(ipv6_chk_custom_prefix); 1586 1587 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev) 1588 { 1589 struct inet6_dev *idev; 1590 struct inet6_ifaddr *ifa; 1591 int onlink; 1592 1593 onlink = 0; 1594 rcu_read_lock(); 1595 idev = __in6_dev_get(dev); 1596 if (idev) { 1597 read_lock_bh(&idev->lock); 1598 list_for_each_entry(ifa, &idev->addr_list, if_list) { 1599 onlink = ipv6_prefix_equal(addr, &ifa->addr, 1600 ifa->prefix_len); 1601 if (onlink) 1602 break; 1603 } 1604 read_unlock_bh(&idev->lock); 1605 } 1606 rcu_read_unlock(); 1607 return onlink; 1608 } 1609 EXPORT_SYMBOL(ipv6_chk_prefix); 1610 1611 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr, 1612 struct net_device *dev, int strict) 1613 { 1614 struct inet6_ifaddr *ifp, *result = NULL; 1615 unsigned int hash = inet6_addr_hash(addr); 1616 1617 rcu_read_lock_bh(); 1618 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) { 1619 if (!net_eq(dev_net(ifp->idev->dev), net)) 1620 continue; 1621 if (ipv6_addr_equal(&ifp->addr, addr)) { 1622 if (dev == NULL || ifp->idev->dev == dev || 1623 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) { 1624 result = ifp; 1625 in6_ifa_hold(ifp); 1626 break; 1627 } 1628 } 1629 } 1630 rcu_read_unlock_bh(); 1631 1632 return result; 1633 } 1634 1635 /* Gets referenced address, destroys ifaddr */ 1636 1637 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed) 1638 { 1639 if (ifp->flags&IFA_F_PERMANENT) { 1640 spin_lock_bh(&ifp->lock); 1641 addrconf_del_dad_work(ifp); 1642 ifp->flags |= IFA_F_TENTATIVE; 1643 if (dad_failed) 1644 ifp->flags |= IFA_F_DADFAILED; 1645 spin_unlock_bh(&ifp->lock); 1646 if (dad_failed) 1647 ipv6_ifa_notify(0, ifp); 1648 in6_ifa_put(ifp); 1649 } else if (ifp->flags&IFA_F_TEMPORARY) { 1650 struct inet6_ifaddr *ifpub; 1651 spin_lock_bh(&ifp->lock); 1652 ifpub = ifp->ifpub; 1653 if (ifpub) { 1654 in6_ifa_hold(ifpub); 1655 spin_unlock_bh(&ifp->lock); 1656 ipv6_create_tempaddr(ifpub, ifp); 1657 in6_ifa_put(ifpub); 1658 } else { 1659 spin_unlock_bh(&ifp->lock); 1660 } 1661 ipv6_del_addr(ifp); 1662 } else { 1663 ipv6_del_addr(ifp); 1664 } 1665 } 1666 1667 static int addrconf_dad_end(struct inet6_ifaddr *ifp) 1668 { 1669 int err = -ENOENT; 1670 1671 spin_lock_bh(&ifp->state_lock); 1672 if (ifp->state == INET6_IFADDR_STATE_DAD) { 1673 ifp->state = INET6_IFADDR_STATE_POSTDAD; 1674 err = 0; 1675 } 1676 spin_unlock_bh(&ifp->state_lock); 1677 1678 return err; 1679 } 1680 1681 void addrconf_dad_failure(struct inet6_ifaddr *ifp) 1682 { 1683 struct inet6_dev *idev = ifp->idev; 1684 1685 if (addrconf_dad_end(ifp)) { 1686 in6_ifa_put(ifp); 1687 return; 1688 } 1689 1690 net_info_ratelimited("%s: IPv6 duplicate address %pI6c detected!\n", 1691 ifp->idev->dev->name, &ifp->addr); 1692 1693 if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6) { 1694 struct in6_addr addr; 1695 1696 addr.s6_addr32[0] = htonl(0xfe800000); 1697 addr.s6_addr32[1] = 0; 1698 1699 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) && 1700 ipv6_addr_equal(&ifp->addr, &addr)) { 1701 /* DAD failed for link-local based on MAC address */ 1702 idev->cnf.disable_ipv6 = 1; 1703 1704 pr_info("%s: IPv6 being disabled!\n", 1705 ifp->idev->dev->name); 1706 } 1707 } 1708 1709 spin_lock_bh(&ifp->state_lock); 1710 /* transition from _POSTDAD to _ERRDAD */ 1711 ifp->state = INET6_IFADDR_STATE_ERRDAD; 1712 spin_unlock_bh(&ifp->state_lock); 1713 1714 addrconf_mod_dad_work(ifp, 0); 1715 } 1716 1717 /* Join to solicited addr multicast group. 1718 * caller must hold RTNL */ 1719 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr) 1720 { 1721 struct in6_addr maddr; 1722 1723 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP)) 1724 return; 1725 1726 addrconf_addr_solict_mult(addr, &maddr); 1727 ipv6_dev_mc_inc(dev, &maddr); 1728 } 1729 1730 /* caller must hold RTNL */ 1731 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr) 1732 { 1733 struct in6_addr maddr; 1734 1735 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP)) 1736 return; 1737 1738 addrconf_addr_solict_mult(addr, &maddr); 1739 __ipv6_dev_mc_dec(idev, &maddr); 1740 } 1741 1742 /* caller must hold RTNL */ 1743 static void addrconf_join_anycast(struct inet6_ifaddr *ifp) 1744 { 1745 struct in6_addr addr; 1746 1747 if (ifp->prefix_len >= 127) /* RFC 6164 */ 1748 return; 1749 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len); 1750 if (ipv6_addr_any(&addr)) 1751 return; 1752 __ipv6_dev_ac_inc(ifp->idev, &addr); 1753 } 1754 1755 /* caller must hold RTNL */ 1756 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp) 1757 { 1758 struct in6_addr addr; 1759 1760 if (ifp->prefix_len >= 127) /* RFC 6164 */ 1761 return; 1762 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len); 1763 if (ipv6_addr_any(&addr)) 1764 return; 1765 __ipv6_dev_ac_dec(ifp->idev, &addr); 1766 } 1767 1768 static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev) 1769 { 1770 if (dev->addr_len != ETH_ALEN) 1771 return -1; 1772 memcpy(eui, dev->dev_addr, 3); 1773 memcpy(eui + 5, dev->dev_addr + 3, 3); 1774 1775 /* 1776 * The zSeries OSA network cards can be shared among various 1777 * OS instances, but the OSA cards have only one MAC address. 1778 * This leads to duplicate address conflicts in conjunction 1779 * with IPv6 if more than one instance uses the same card. 1780 * 1781 * The driver for these cards can deliver a unique 16-bit 1782 * identifier for each instance sharing the same card. It is 1783 * placed instead of 0xFFFE in the interface identifier. The 1784 * "u" bit of the interface identifier is not inverted in this 1785 * case. Hence the resulting interface identifier has local 1786 * scope according to RFC2373. 1787 */ 1788 if (dev->dev_id) { 1789 eui[3] = (dev->dev_id >> 8) & 0xFF; 1790 eui[4] = dev->dev_id & 0xFF; 1791 } else { 1792 eui[3] = 0xFF; 1793 eui[4] = 0xFE; 1794 eui[0] ^= 2; 1795 } 1796 return 0; 1797 } 1798 1799 static int addrconf_ifid_eui64(u8 *eui, struct net_device *dev) 1800 { 1801 if (dev->addr_len != IEEE802154_ADDR_LEN) 1802 return -1; 1803 memcpy(eui, dev->dev_addr, 8); 1804 eui[0] ^= 2; 1805 return 0; 1806 } 1807 1808 static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev) 1809 { 1810 union fwnet_hwaddr *ha; 1811 1812 if (dev->addr_len != FWNET_ALEN) 1813 return -1; 1814 1815 ha = (union fwnet_hwaddr *)dev->dev_addr; 1816 1817 memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id)); 1818 eui[0] ^= 2; 1819 return 0; 1820 } 1821 1822 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev) 1823 { 1824 /* XXX: inherit EUI-64 from other interface -- yoshfuji */ 1825 if (dev->addr_len != ARCNET_ALEN) 1826 return -1; 1827 memset(eui, 0, 7); 1828 eui[7] = *(u8 *)dev->dev_addr; 1829 return 0; 1830 } 1831 1832 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev) 1833 { 1834 if (dev->addr_len != INFINIBAND_ALEN) 1835 return -1; 1836 memcpy(eui, dev->dev_addr + 12, 8); 1837 eui[0] |= 2; 1838 return 0; 1839 } 1840 1841 static int __ipv6_isatap_ifid(u8 *eui, __be32 addr) 1842 { 1843 if (addr == 0) 1844 return -1; 1845 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) || 1846 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) || 1847 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) || 1848 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) || 1849 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) || 1850 ipv4_is_lbcast(addr)) ? 0x00 : 0x02; 1851 eui[1] = 0; 1852 eui[2] = 0x5E; 1853 eui[3] = 0xFE; 1854 memcpy(eui + 4, &addr, 4); 1855 return 0; 1856 } 1857 1858 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev) 1859 { 1860 if (dev->priv_flags & IFF_ISATAP) 1861 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr); 1862 return -1; 1863 } 1864 1865 static int addrconf_ifid_gre(u8 *eui, struct net_device *dev) 1866 { 1867 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr); 1868 } 1869 1870 static int addrconf_ifid_ip6tnl(u8 *eui, struct net_device *dev) 1871 { 1872 memcpy(eui, dev->perm_addr, 3); 1873 memcpy(eui + 5, dev->perm_addr + 3, 3); 1874 eui[3] = 0xFF; 1875 eui[4] = 0xFE; 1876 eui[0] ^= 2; 1877 return 0; 1878 } 1879 1880 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev) 1881 { 1882 switch (dev->type) { 1883 case ARPHRD_ETHER: 1884 case ARPHRD_FDDI: 1885 return addrconf_ifid_eui48(eui, dev); 1886 case ARPHRD_ARCNET: 1887 return addrconf_ifid_arcnet(eui, dev); 1888 case ARPHRD_INFINIBAND: 1889 return addrconf_ifid_infiniband(eui, dev); 1890 case ARPHRD_SIT: 1891 return addrconf_ifid_sit(eui, dev); 1892 case ARPHRD_IPGRE: 1893 return addrconf_ifid_gre(eui, dev); 1894 case ARPHRD_6LOWPAN: 1895 case ARPHRD_IEEE802154: 1896 return addrconf_ifid_eui64(eui, dev); 1897 case ARPHRD_IEEE1394: 1898 return addrconf_ifid_ieee1394(eui, dev); 1899 case ARPHRD_TUNNEL6: 1900 return addrconf_ifid_ip6tnl(eui, dev); 1901 } 1902 return -1; 1903 } 1904 1905 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev) 1906 { 1907 int err = -1; 1908 struct inet6_ifaddr *ifp; 1909 1910 read_lock_bh(&idev->lock); 1911 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) { 1912 if (ifp->scope > IFA_LINK) 1913 break; 1914 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) { 1915 memcpy(eui, ifp->addr.s6_addr+8, 8); 1916 err = 0; 1917 break; 1918 } 1919 } 1920 read_unlock_bh(&idev->lock); 1921 return err; 1922 } 1923 1924 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */ 1925 static void __ipv6_regen_rndid(struct inet6_dev *idev) 1926 { 1927 regen: 1928 get_random_bytes(idev->rndid, sizeof(idev->rndid)); 1929 idev->rndid[0] &= ~0x02; 1930 1931 /* 1932 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>: 1933 * check if generated address is not inappropriate 1934 * 1935 * - Reserved subnet anycast (RFC 2526) 1936 * 11111101 11....11 1xxxxxxx 1937 * - ISATAP (RFC4214) 6.1 1938 * 00-00-5E-FE-xx-xx-xx-xx 1939 * - value 0 1940 * - XXX: already assigned to an address on the device 1941 */ 1942 if (idev->rndid[0] == 0xfd && 1943 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff && 1944 (idev->rndid[7]&0x80)) 1945 goto regen; 1946 if ((idev->rndid[0]|idev->rndid[1]) == 0) { 1947 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe) 1948 goto regen; 1949 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00) 1950 goto regen; 1951 } 1952 } 1953 1954 static void ipv6_regen_rndid(unsigned long data) 1955 { 1956 struct inet6_dev *idev = (struct inet6_dev *) data; 1957 unsigned long expires; 1958 1959 rcu_read_lock_bh(); 1960 write_lock_bh(&idev->lock); 1961 1962 if (idev->dead) 1963 goto out; 1964 1965 __ipv6_regen_rndid(idev); 1966 1967 expires = jiffies + 1968 idev->cnf.temp_prefered_lft * HZ - 1969 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * 1970 NEIGH_VAR(idev->nd_parms, RETRANS_TIME) - 1971 idev->cnf.max_desync_factor * HZ; 1972 if (time_before(expires, jiffies)) { 1973 pr_warn("%s: too short regeneration interval; timer disabled for %s\n", 1974 __func__, idev->dev->name); 1975 goto out; 1976 } 1977 1978 if (!mod_timer(&idev->regen_timer, expires)) 1979 in6_dev_hold(idev); 1980 1981 out: 1982 write_unlock_bh(&idev->lock); 1983 rcu_read_unlock_bh(); 1984 in6_dev_put(idev); 1985 } 1986 1987 static void __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) 1988 { 1989 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0) 1990 __ipv6_regen_rndid(idev); 1991 } 1992 1993 /* 1994 * Add prefix route. 1995 */ 1996 1997 static void 1998 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev, 1999 unsigned long expires, u32 flags) 2000 { 2001 struct fib6_config cfg = { 2002 .fc_table = RT6_TABLE_PREFIX, 2003 .fc_metric = IP6_RT_PRIO_ADDRCONF, 2004 .fc_ifindex = dev->ifindex, 2005 .fc_expires = expires, 2006 .fc_dst_len = plen, 2007 .fc_flags = RTF_UP | flags, 2008 .fc_nlinfo.nl_net = dev_net(dev), 2009 .fc_protocol = RTPROT_KERNEL, 2010 }; 2011 2012 cfg.fc_dst = *pfx; 2013 2014 /* Prevent useless cloning on PtP SIT. 2015 This thing is done here expecting that the whole 2016 class of non-broadcast devices need not cloning. 2017 */ 2018 #if IS_ENABLED(CONFIG_IPV6_SIT) 2019 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT)) 2020 cfg.fc_flags |= RTF_NONEXTHOP; 2021 #endif 2022 2023 ip6_route_add(&cfg); 2024 } 2025 2026 2027 static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx, 2028 int plen, 2029 const struct net_device *dev, 2030 u32 flags, u32 noflags) 2031 { 2032 struct fib6_node *fn; 2033 struct rt6_info *rt = NULL; 2034 struct fib6_table *table; 2035 2036 table = fib6_get_table(dev_net(dev), RT6_TABLE_PREFIX); 2037 if (table == NULL) 2038 return NULL; 2039 2040 read_lock_bh(&table->tb6_lock); 2041 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0); 2042 if (!fn) 2043 goto out; 2044 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) { 2045 if (rt->dst.dev->ifindex != dev->ifindex) 2046 continue; 2047 if ((rt->rt6i_flags & flags) != flags) 2048 continue; 2049 if ((rt->rt6i_flags & noflags) != 0) 2050 continue; 2051 dst_hold(&rt->dst); 2052 break; 2053 } 2054 out: 2055 read_unlock_bh(&table->tb6_lock); 2056 return rt; 2057 } 2058 2059 2060 /* Create "default" multicast route to the interface */ 2061 2062 static void addrconf_add_mroute(struct net_device *dev) 2063 { 2064 struct fib6_config cfg = { 2065 .fc_table = RT6_TABLE_LOCAL, 2066 .fc_metric = IP6_RT_PRIO_ADDRCONF, 2067 .fc_ifindex = dev->ifindex, 2068 .fc_dst_len = 8, 2069 .fc_flags = RTF_UP, 2070 .fc_nlinfo.nl_net = dev_net(dev), 2071 }; 2072 2073 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0); 2074 2075 ip6_route_add(&cfg); 2076 } 2077 2078 static struct inet6_dev *addrconf_add_dev(struct net_device *dev) 2079 { 2080 struct inet6_dev *idev; 2081 2082 ASSERT_RTNL(); 2083 2084 idev = ipv6_find_idev(dev); 2085 if (!idev) 2086 return ERR_PTR(-ENOBUFS); 2087 2088 if (idev->cnf.disable_ipv6) 2089 return ERR_PTR(-EACCES); 2090 2091 /* Add default multicast route */ 2092 if (!(dev->flags & IFF_LOOPBACK)) 2093 addrconf_add_mroute(dev); 2094 2095 return idev; 2096 } 2097 2098 static void manage_tempaddrs(struct inet6_dev *idev, 2099 struct inet6_ifaddr *ifp, 2100 __u32 valid_lft, __u32 prefered_lft, 2101 bool create, unsigned long now) 2102 { 2103 u32 flags; 2104 struct inet6_ifaddr *ift; 2105 2106 read_lock_bh(&idev->lock); 2107 /* update all temporary addresses in the list */ 2108 list_for_each_entry(ift, &idev->tempaddr_list, tmp_list) { 2109 int age, max_valid, max_prefered; 2110 2111 if (ifp != ift->ifpub) 2112 continue; 2113 2114 /* RFC 4941 section 3.3: 2115 * If a received option will extend the lifetime of a public 2116 * address, the lifetimes of temporary addresses should 2117 * be extended, subject to the overall constraint that no 2118 * temporary addresses should ever remain "valid" or "preferred" 2119 * for a time longer than (TEMP_VALID_LIFETIME) or 2120 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), respectively. 2121 */ 2122 age = (now - ift->cstamp) / HZ; 2123 max_valid = idev->cnf.temp_valid_lft - age; 2124 if (max_valid < 0) 2125 max_valid = 0; 2126 2127 max_prefered = idev->cnf.temp_prefered_lft - 2128 idev->cnf.max_desync_factor - age; 2129 if (max_prefered < 0) 2130 max_prefered = 0; 2131 2132 if (valid_lft > max_valid) 2133 valid_lft = max_valid; 2134 2135 if (prefered_lft > max_prefered) 2136 prefered_lft = max_prefered; 2137 2138 spin_lock(&ift->lock); 2139 flags = ift->flags; 2140 ift->valid_lft = valid_lft; 2141 ift->prefered_lft = prefered_lft; 2142 ift->tstamp = now; 2143 if (prefered_lft > 0) 2144 ift->flags &= ~IFA_F_DEPRECATED; 2145 2146 spin_unlock(&ift->lock); 2147 if (!(flags&IFA_F_TENTATIVE)) 2148 ipv6_ifa_notify(0, ift); 2149 } 2150 2151 if ((create || list_empty(&idev->tempaddr_list)) && 2152 idev->cnf.use_tempaddr > 0) { 2153 /* When a new public address is created as described 2154 * in [ADDRCONF], also create a new temporary address. 2155 * Also create a temporary address if it's enabled but 2156 * no temporary address currently exists. 2157 */ 2158 read_unlock_bh(&idev->lock); 2159 ipv6_create_tempaddr(ifp, NULL); 2160 } else { 2161 read_unlock_bh(&idev->lock); 2162 } 2163 } 2164 2165 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao) 2166 { 2167 struct prefix_info *pinfo; 2168 __u32 valid_lft; 2169 __u32 prefered_lft; 2170 int addr_type; 2171 struct inet6_dev *in6_dev; 2172 struct net *net = dev_net(dev); 2173 2174 pinfo = (struct prefix_info *) opt; 2175 2176 if (len < sizeof(struct prefix_info)) { 2177 ADBG("addrconf: prefix option too short\n"); 2178 return; 2179 } 2180 2181 /* 2182 * Validation checks ([ADDRCONF], page 19) 2183 */ 2184 2185 addr_type = ipv6_addr_type(&pinfo->prefix); 2186 2187 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL)) 2188 return; 2189 2190 valid_lft = ntohl(pinfo->valid); 2191 prefered_lft = ntohl(pinfo->prefered); 2192 2193 if (prefered_lft > valid_lft) { 2194 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n"); 2195 return; 2196 } 2197 2198 in6_dev = in6_dev_get(dev); 2199 2200 if (in6_dev == NULL) { 2201 net_dbg_ratelimited("addrconf: device %s not configured\n", 2202 dev->name); 2203 return; 2204 } 2205 2206 /* 2207 * Two things going on here: 2208 * 1) Add routes for on-link prefixes 2209 * 2) Configure prefixes with the auto flag set 2210 */ 2211 2212 if (pinfo->onlink) { 2213 struct rt6_info *rt; 2214 unsigned long rt_expires; 2215 2216 /* Avoid arithmetic overflow. Really, we could 2217 * save rt_expires in seconds, likely valid_lft, 2218 * but it would require division in fib gc, that it 2219 * not good. 2220 */ 2221 if (HZ > USER_HZ) 2222 rt_expires = addrconf_timeout_fixup(valid_lft, HZ); 2223 else 2224 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ); 2225 2226 if (addrconf_finite_timeout(rt_expires)) 2227 rt_expires *= HZ; 2228 2229 rt = addrconf_get_prefix_route(&pinfo->prefix, 2230 pinfo->prefix_len, 2231 dev, 2232 RTF_ADDRCONF | RTF_PREFIX_RT, 2233 RTF_GATEWAY | RTF_DEFAULT); 2234 2235 if (rt) { 2236 /* Autoconf prefix route */ 2237 if (valid_lft == 0) { 2238 ip6_del_rt(rt); 2239 rt = NULL; 2240 } else if (addrconf_finite_timeout(rt_expires)) { 2241 /* not infinity */ 2242 rt6_set_expires(rt, jiffies + rt_expires); 2243 } else { 2244 rt6_clean_expires(rt); 2245 } 2246 } else if (valid_lft) { 2247 clock_t expires = 0; 2248 int flags = RTF_ADDRCONF | RTF_PREFIX_RT; 2249 if (addrconf_finite_timeout(rt_expires)) { 2250 /* not infinity */ 2251 flags |= RTF_EXPIRES; 2252 expires = jiffies_to_clock_t(rt_expires); 2253 } 2254 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len, 2255 dev, expires, flags); 2256 } 2257 ip6_rt_put(rt); 2258 } 2259 2260 /* Try to figure out our local address for this prefix */ 2261 2262 if (pinfo->autoconf && in6_dev->cnf.autoconf) { 2263 struct inet6_ifaddr *ifp; 2264 struct in6_addr addr; 2265 int create = 0, update_lft = 0; 2266 bool tokenized = false; 2267 2268 if (pinfo->prefix_len == 64) { 2269 memcpy(&addr, &pinfo->prefix, 8); 2270 2271 if (!ipv6_addr_any(&in6_dev->token)) { 2272 read_lock_bh(&in6_dev->lock); 2273 memcpy(addr.s6_addr + 8, 2274 in6_dev->token.s6_addr + 8, 8); 2275 read_unlock_bh(&in6_dev->lock); 2276 tokenized = true; 2277 } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) && 2278 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) { 2279 in6_dev_put(in6_dev); 2280 return; 2281 } 2282 goto ok; 2283 } 2284 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n", 2285 pinfo->prefix_len); 2286 in6_dev_put(in6_dev); 2287 return; 2288 2289 ok: 2290 2291 ifp = ipv6_get_ifaddr(net, &addr, dev, 1); 2292 2293 if (ifp == NULL && valid_lft) { 2294 int max_addresses = in6_dev->cnf.max_addresses; 2295 u32 addr_flags = 0; 2296 2297 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 2298 if (in6_dev->cnf.optimistic_dad && 2299 !net->ipv6.devconf_all->forwarding && sllao) 2300 addr_flags = IFA_F_OPTIMISTIC; 2301 #endif 2302 2303 /* Do not allow to create too much of autoconfigured 2304 * addresses; this would be too easy way to crash kernel. 2305 */ 2306 if (!max_addresses || 2307 ipv6_count_addresses(in6_dev) < max_addresses) 2308 ifp = ipv6_add_addr(in6_dev, &addr, NULL, 2309 pinfo->prefix_len, 2310 addr_type&IPV6_ADDR_SCOPE_MASK, 2311 addr_flags, valid_lft, 2312 prefered_lft); 2313 2314 if (IS_ERR_OR_NULL(ifp)) { 2315 in6_dev_put(in6_dev); 2316 return; 2317 } 2318 2319 update_lft = 0; 2320 create = 1; 2321 spin_lock_bh(&ifp->lock); 2322 ifp->flags |= IFA_F_MANAGETEMPADDR; 2323 ifp->cstamp = jiffies; 2324 ifp->tokenized = tokenized; 2325 spin_unlock_bh(&ifp->lock); 2326 addrconf_dad_start(ifp); 2327 } 2328 2329 if (ifp) { 2330 u32 flags; 2331 unsigned long now; 2332 u32 stored_lft; 2333 2334 /* update lifetime (RFC2462 5.5.3 e) */ 2335 spin_lock(&ifp->lock); 2336 now = jiffies; 2337 if (ifp->valid_lft > (now - ifp->tstamp) / HZ) 2338 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ; 2339 else 2340 stored_lft = 0; 2341 if (!update_lft && !create && stored_lft) { 2342 const u32 minimum_lft = min_t(u32, 2343 stored_lft, MIN_VALID_LIFETIME); 2344 valid_lft = max(valid_lft, minimum_lft); 2345 2346 /* RFC4862 Section 5.5.3e: 2347 * "Note that the preferred lifetime of the 2348 * corresponding address is always reset to 2349 * the Preferred Lifetime in the received 2350 * Prefix Information option, regardless of 2351 * whether the valid lifetime is also reset or 2352 * ignored." 2353 * 2354 * So we should always update prefered_lft here. 2355 */ 2356 update_lft = 1; 2357 } 2358 2359 if (update_lft) { 2360 ifp->valid_lft = valid_lft; 2361 ifp->prefered_lft = prefered_lft; 2362 ifp->tstamp = now; 2363 flags = ifp->flags; 2364 ifp->flags &= ~IFA_F_DEPRECATED; 2365 spin_unlock(&ifp->lock); 2366 2367 if (!(flags&IFA_F_TENTATIVE)) 2368 ipv6_ifa_notify(0, ifp); 2369 } else 2370 spin_unlock(&ifp->lock); 2371 2372 manage_tempaddrs(in6_dev, ifp, valid_lft, prefered_lft, 2373 create, now); 2374 2375 in6_ifa_put(ifp); 2376 addrconf_verify(); 2377 } 2378 } 2379 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo); 2380 in6_dev_put(in6_dev); 2381 } 2382 2383 /* 2384 * Set destination address. 2385 * Special case for SIT interfaces where we create a new "virtual" 2386 * device. 2387 */ 2388 int addrconf_set_dstaddr(struct net *net, void __user *arg) 2389 { 2390 struct in6_ifreq ireq; 2391 struct net_device *dev; 2392 int err = -EINVAL; 2393 2394 rtnl_lock(); 2395 2396 err = -EFAULT; 2397 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2398 goto err_exit; 2399 2400 dev = __dev_get_by_index(net, ireq.ifr6_ifindex); 2401 2402 err = -ENODEV; 2403 if (dev == NULL) 2404 goto err_exit; 2405 2406 #if IS_ENABLED(CONFIG_IPV6_SIT) 2407 if (dev->type == ARPHRD_SIT) { 2408 const struct net_device_ops *ops = dev->netdev_ops; 2409 struct ifreq ifr; 2410 struct ip_tunnel_parm p; 2411 2412 err = -EADDRNOTAVAIL; 2413 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4)) 2414 goto err_exit; 2415 2416 memset(&p, 0, sizeof(p)); 2417 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3]; 2418 p.iph.saddr = 0; 2419 p.iph.version = 4; 2420 p.iph.ihl = 5; 2421 p.iph.protocol = IPPROTO_IPV6; 2422 p.iph.ttl = 64; 2423 ifr.ifr_ifru.ifru_data = (__force void __user *)&p; 2424 2425 if (ops->ndo_do_ioctl) { 2426 mm_segment_t oldfs = get_fs(); 2427 2428 set_fs(KERNEL_DS); 2429 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL); 2430 set_fs(oldfs); 2431 } else 2432 err = -EOPNOTSUPP; 2433 2434 if (err == 0) { 2435 err = -ENOBUFS; 2436 dev = __dev_get_by_name(net, p.name); 2437 if (!dev) 2438 goto err_exit; 2439 err = dev_open(dev); 2440 } 2441 } 2442 #endif 2443 2444 err_exit: 2445 rtnl_unlock(); 2446 return err; 2447 } 2448 2449 /* 2450 * Manual configuration of address on an interface 2451 */ 2452 static int inet6_addr_add(struct net *net, int ifindex, 2453 const struct in6_addr *pfx, 2454 const struct in6_addr *peer_pfx, 2455 unsigned int plen, __u32 ifa_flags, 2456 __u32 prefered_lft, __u32 valid_lft) 2457 { 2458 struct inet6_ifaddr *ifp; 2459 struct inet6_dev *idev; 2460 struct net_device *dev; 2461 int scope; 2462 u32 flags; 2463 clock_t expires; 2464 unsigned long timeout; 2465 2466 ASSERT_RTNL(); 2467 2468 if (plen > 128) 2469 return -EINVAL; 2470 2471 /* check the lifetime */ 2472 if (!valid_lft || prefered_lft > valid_lft) 2473 return -EINVAL; 2474 2475 if (ifa_flags & IFA_F_MANAGETEMPADDR && plen != 64) 2476 return -EINVAL; 2477 2478 dev = __dev_get_by_index(net, ifindex); 2479 if (!dev) 2480 return -ENODEV; 2481 2482 idev = addrconf_add_dev(dev); 2483 if (IS_ERR(idev)) 2484 return PTR_ERR(idev); 2485 2486 scope = ipv6_addr_scope(pfx); 2487 2488 timeout = addrconf_timeout_fixup(valid_lft, HZ); 2489 if (addrconf_finite_timeout(timeout)) { 2490 expires = jiffies_to_clock_t(timeout * HZ); 2491 valid_lft = timeout; 2492 flags = RTF_EXPIRES; 2493 } else { 2494 expires = 0; 2495 flags = 0; 2496 ifa_flags |= IFA_F_PERMANENT; 2497 } 2498 2499 timeout = addrconf_timeout_fixup(prefered_lft, HZ); 2500 if (addrconf_finite_timeout(timeout)) { 2501 if (timeout == 0) 2502 ifa_flags |= IFA_F_DEPRECATED; 2503 prefered_lft = timeout; 2504 } 2505 2506 ifp = ipv6_add_addr(idev, pfx, peer_pfx, plen, scope, ifa_flags, 2507 valid_lft, prefered_lft); 2508 2509 if (!IS_ERR(ifp)) { 2510 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) { 2511 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev, 2512 expires, flags); 2513 } 2514 2515 /* 2516 * Note that section 3.1 of RFC 4429 indicates 2517 * that the Optimistic flag should not be set for 2518 * manually configured addresses 2519 */ 2520 addrconf_dad_start(ifp); 2521 if (ifa_flags & IFA_F_MANAGETEMPADDR) 2522 manage_tempaddrs(idev, ifp, valid_lft, prefered_lft, 2523 true, jiffies); 2524 in6_ifa_put(ifp); 2525 addrconf_verify_rtnl(); 2526 return 0; 2527 } 2528 2529 return PTR_ERR(ifp); 2530 } 2531 2532 static int inet6_addr_del(struct net *net, int ifindex, u32 ifa_flags, 2533 const struct in6_addr *pfx, unsigned int plen) 2534 { 2535 struct inet6_ifaddr *ifp; 2536 struct inet6_dev *idev; 2537 struct net_device *dev; 2538 2539 if (plen > 128) 2540 return -EINVAL; 2541 2542 dev = __dev_get_by_index(net, ifindex); 2543 if (!dev) 2544 return -ENODEV; 2545 2546 idev = __in6_dev_get(dev); 2547 if (idev == NULL) 2548 return -ENXIO; 2549 2550 read_lock_bh(&idev->lock); 2551 list_for_each_entry(ifp, &idev->addr_list, if_list) { 2552 if (ifp->prefix_len == plen && 2553 ipv6_addr_equal(pfx, &ifp->addr)) { 2554 in6_ifa_hold(ifp); 2555 read_unlock_bh(&idev->lock); 2556 2557 if (!(ifp->flags & IFA_F_TEMPORARY) && 2558 (ifa_flags & IFA_F_MANAGETEMPADDR)) 2559 manage_tempaddrs(idev, ifp, 0, 0, false, 2560 jiffies); 2561 ipv6_del_addr(ifp); 2562 addrconf_verify_rtnl(); 2563 return 0; 2564 } 2565 } 2566 read_unlock_bh(&idev->lock); 2567 return -EADDRNOTAVAIL; 2568 } 2569 2570 2571 int addrconf_add_ifaddr(struct net *net, void __user *arg) 2572 { 2573 struct in6_ifreq ireq; 2574 int err; 2575 2576 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 2577 return -EPERM; 2578 2579 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2580 return -EFAULT; 2581 2582 rtnl_lock(); 2583 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, NULL, 2584 ireq.ifr6_prefixlen, IFA_F_PERMANENT, 2585 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME); 2586 rtnl_unlock(); 2587 return err; 2588 } 2589 2590 int addrconf_del_ifaddr(struct net *net, void __user *arg) 2591 { 2592 struct in6_ifreq ireq; 2593 int err; 2594 2595 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 2596 return -EPERM; 2597 2598 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2599 return -EFAULT; 2600 2601 rtnl_lock(); 2602 err = inet6_addr_del(net, ireq.ifr6_ifindex, 0, &ireq.ifr6_addr, 2603 ireq.ifr6_prefixlen); 2604 rtnl_unlock(); 2605 return err; 2606 } 2607 2608 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr, 2609 int plen, int scope) 2610 { 2611 struct inet6_ifaddr *ifp; 2612 2613 ifp = ipv6_add_addr(idev, addr, NULL, plen, 2614 scope, IFA_F_PERMANENT, 2615 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME); 2616 if (!IS_ERR(ifp)) { 2617 spin_lock_bh(&ifp->lock); 2618 ifp->flags &= ~IFA_F_TENTATIVE; 2619 spin_unlock_bh(&ifp->lock); 2620 ipv6_ifa_notify(RTM_NEWADDR, ifp); 2621 in6_ifa_put(ifp); 2622 } 2623 } 2624 2625 #if IS_ENABLED(CONFIG_IPV6_SIT) 2626 static void sit_add_v4_addrs(struct inet6_dev *idev) 2627 { 2628 struct in6_addr addr; 2629 struct net_device *dev; 2630 struct net *net = dev_net(idev->dev); 2631 int scope, plen; 2632 u32 pflags = 0; 2633 2634 ASSERT_RTNL(); 2635 2636 memset(&addr, 0, sizeof(struct in6_addr)); 2637 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4); 2638 2639 if (idev->dev->flags&IFF_POINTOPOINT) { 2640 addr.s6_addr32[0] = htonl(0xfe800000); 2641 scope = IFA_LINK; 2642 plen = 64; 2643 } else { 2644 scope = IPV6_ADDR_COMPATv4; 2645 plen = 96; 2646 pflags |= RTF_NONEXTHOP; 2647 } 2648 2649 if (addr.s6_addr32[3]) { 2650 add_addr(idev, &addr, plen, scope); 2651 addrconf_prefix_route(&addr, plen, idev->dev, 0, pflags); 2652 return; 2653 } 2654 2655 for_each_netdev(net, dev) { 2656 struct in_device *in_dev = __in_dev_get_rtnl(dev); 2657 if (in_dev && (dev->flags & IFF_UP)) { 2658 struct in_ifaddr *ifa; 2659 2660 int flag = scope; 2661 2662 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) { 2663 2664 addr.s6_addr32[3] = ifa->ifa_local; 2665 2666 if (ifa->ifa_scope == RT_SCOPE_LINK) 2667 continue; 2668 if (ifa->ifa_scope >= RT_SCOPE_HOST) { 2669 if (idev->dev->flags&IFF_POINTOPOINT) 2670 continue; 2671 flag |= IFA_HOST; 2672 } 2673 2674 add_addr(idev, &addr, plen, flag); 2675 addrconf_prefix_route(&addr, plen, idev->dev, 0, 2676 pflags); 2677 } 2678 } 2679 } 2680 } 2681 #endif 2682 2683 static void init_loopback(struct net_device *dev) 2684 { 2685 struct inet6_dev *idev; 2686 struct net_device *sp_dev; 2687 struct inet6_ifaddr *sp_ifa; 2688 struct rt6_info *sp_rt; 2689 2690 /* ::1 */ 2691 2692 ASSERT_RTNL(); 2693 2694 idev = ipv6_find_idev(dev); 2695 if (idev == NULL) { 2696 pr_debug("%s: add_dev failed\n", __func__); 2697 return; 2698 } 2699 2700 add_addr(idev, &in6addr_loopback, 128, IFA_HOST); 2701 2702 /* Add routes to other interface's IPv6 addresses */ 2703 for_each_netdev(dev_net(dev), sp_dev) { 2704 if (!strcmp(sp_dev->name, dev->name)) 2705 continue; 2706 2707 idev = __in6_dev_get(sp_dev); 2708 if (!idev) 2709 continue; 2710 2711 read_lock_bh(&idev->lock); 2712 list_for_each_entry(sp_ifa, &idev->addr_list, if_list) { 2713 2714 if (sp_ifa->flags & (IFA_F_DADFAILED | IFA_F_TENTATIVE)) 2715 continue; 2716 2717 if (sp_ifa->rt) { 2718 /* This dst has been added to garbage list when 2719 * lo device down, release this obsolete dst and 2720 * reallocate a new router for ifa. 2721 */ 2722 if (sp_ifa->rt->dst.obsolete > 0) { 2723 ip6_rt_put(sp_ifa->rt); 2724 sp_ifa->rt = NULL; 2725 } else { 2726 continue; 2727 } 2728 } 2729 2730 sp_rt = addrconf_dst_alloc(idev, &sp_ifa->addr, false); 2731 2732 /* Failure cases are ignored */ 2733 if (!IS_ERR(sp_rt)) { 2734 sp_ifa->rt = sp_rt; 2735 ip6_ins_rt(sp_rt); 2736 } 2737 } 2738 read_unlock_bh(&idev->lock); 2739 } 2740 } 2741 2742 static void addrconf_add_linklocal(struct inet6_dev *idev, const struct in6_addr *addr) 2743 { 2744 struct inet6_ifaddr *ifp; 2745 u32 addr_flags = IFA_F_PERMANENT; 2746 2747 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 2748 if (idev->cnf.optimistic_dad && 2749 !dev_net(idev->dev)->ipv6.devconf_all->forwarding) 2750 addr_flags |= IFA_F_OPTIMISTIC; 2751 #endif 2752 2753 2754 ifp = ipv6_add_addr(idev, addr, NULL, 64, IFA_LINK, addr_flags, 2755 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME); 2756 if (!IS_ERR(ifp)) { 2757 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0); 2758 addrconf_dad_start(ifp); 2759 in6_ifa_put(ifp); 2760 } 2761 } 2762 2763 static void addrconf_addr_gen(struct inet6_dev *idev, bool prefix_route) 2764 { 2765 if (idev->addr_gen_mode == IN6_ADDR_GEN_MODE_EUI64) { 2766 struct in6_addr addr; 2767 2768 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0); 2769 /* addrconf_add_linklocal also adds a prefix_route and we 2770 * only need to care about prefix routes if ipv6_generate_eui64 2771 * couldn't generate one. 2772 */ 2773 if (ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) == 0) 2774 addrconf_add_linklocal(idev, &addr); 2775 else if (prefix_route) 2776 addrconf_prefix_route(&addr, 64, idev->dev, 0, 0); 2777 } 2778 } 2779 2780 static void addrconf_dev_config(struct net_device *dev) 2781 { 2782 struct inet6_dev *idev; 2783 2784 ASSERT_RTNL(); 2785 2786 if ((dev->type != ARPHRD_ETHER) && 2787 (dev->type != ARPHRD_FDDI) && 2788 (dev->type != ARPHRD_ARCNET) && 2789 (dev->type != ARPHRD_INFINIBAND) && 2790 (dev->type != ARPHRD_IEEE802154) && 2791 (dev->type != ARPHRD_IEEE1394) && 2792 (dev->type != ARPHRD_TUNNEL6) && 2793 (dev->type != ARPHRD_6LOWPAN)) { 2794 /* Alas, we support only Ethernet autoconfiguration. */ 2795 return; 2796 } 2797 2798 idev = addrconf_add_dev(dev); 2799 if (IS_ERR(idev)) 2800 return; 2801 2802 addrconf_addr_gen(idev, false); 2803 } 2804 2805 #if IS_ENABLED(CONFIG_IPV6_SIT) 2806 static void addrconf_sit_config(struct net_device *dev) 2807 { 2808 struct inet6_dev *idev; 2809 2810 ASSERT_RTNL(); 2811 2812 /* 2813 * Configure the tunnel with one of our IPv4 2814 * addresses... we should configure all of 2815 * our v4 addrs in the tunnel 2816 */ 2817 2818 idev = ipv6_find_idev(dev); 2819 if (idev == NULL) { 2820 pr_debug("%s: add_dev failed\n", __func__); 2821 return; 2822 } 2823 2824 if (dev->priv_flags & IFF_ISATAP) { 2825 addrconf_addr_gen(idev, false); 2826 return; 2827 } 2828 2829 sit_add_v4_addrs(idev); 2830 2831 if (dev->flags&IFF_POINTOPOINT) 2832 addrconf_add_mroute(dev); 2833 } 2834 #endif 2835 2836 #if IS_ENABLED(CONFIG_NET_IPGRE) 2837 static void addrconf_gre_config(struct net_device *dev) 2838 { 2839 struct inet6_dev *idev; 2840 2841 ASSERT_RTNL(); 2842 2843 idev = ipv6_find_idev(dev); 2844 if (idev == NULL) { 2845 pr_debug("%s: add_dev failed\n", __func__); 2846 return; 2847 } 2848 2849 addrconf_addr_gen(idev, true); 2850 } 2851 #endif 2852 2853 static int addrconf_notify(struct notifier_block *this, unsigned long event, 2854 void *ptr) 2855 { 2856 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 2857 struct inet6_dev *idev = __in6_dev_get(dev); 2858 int run_pending = 0; 2859 int err; 2860 2861 switch (event) { 2862 case NETDEV_REGISTER: 2863 if (!idev && dev->mtu >= IPV6_MIN_MTU) { 2864 idev = ipv6_add_dev(dev); 2865 if (IS_ERR(idev)) 2866 return notifier_from_errno(PTR_ERR(idev)); 2867 } 2868 break; 2869 2870 case NETDEV_UP: 2871 case NETDEV_CHANGE: 2872 if (dev->flags & IFF_SLAVE) 2873 break; 2874 2875 if (idev && idev->cnf.disable_ipv6) 2876 break; 2877 2878 if (event == NETDEV_UP) { 2879 if (!addrconf_qdisc_ok(dev)) { 2880 /* device is not ready yet. */ 2881 pr_info("ADDRCONF(NETDEV_UP): %s: link is not ready\n", 2882 dev->name); 2883 break; 2884 } 2885 2886 if (!idev && dev->mtu >= IPV6_MIN_MTU) 2887 idev = ipv6_add_dev(dev); 2888 2889 if (!IS_ERR_OR_NULL(idev)) { 2890 idev->if_flags |= IF_READY; 2891 run_pending = 1; 2892 } 2893 } else { 2894 if (!addrconf_qdisc_ok(dev)) { 2895 /* device is still not ready. */ 2896 break; 2897 } 2898 2899 if (idev) { 2900 if (idev->if_flags & IF_READY) 2901 /* device is already configured. */ 2902 break; 2903 idev->if_flags |= IF_READY; 2904 } 2905 2906 pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n", 2907 dev->name); 2908 2909 run_pending = 1; 2910 } 2911 2912 switch (dev->type) { 2913 #if IS_ENABLED(CONFIG_IPV6_SIT) 2914 case ARPHRD_SIT: 2915 addrconf_sit_config(dev); 2916 break; 2917 #endif 2918 #if IS_ENABLED(CONFIG_NET_IPGRE) 2919 case ARPHRD_IPGRE: 2920 addrconf_gre_config(dev); 2921 break; 2922 #endif 2923 case ARPHRD_LOOPBACK: 2924 init_loopback(dev); 2925 break; 2926 2927 default: 2928 addrconf_dev_config(dev); 2929 break; 2930 } 2931 2932 if (!IS_ERR_OR_NULL(idev)) { 2933 if (run_pending) 2934 addrconf_dad_run(idev); 2935 2936 /* 2937 * If the MTU changed during the interface down, 2938 * when the interface up, the changed MTU must be 2939 * reflected in the idev as well as routers. 2940 */ 2941 if (idev->cnf.mtu6 != dev->mtu && 2942 dev->mtu >= IPV6_MIN_MTU) { 2943 rt6_mtu_change(dev, dev->mtu); 2944 idev->cnf.mtu6 = dev->mtu; 2945 } 2946 idev->tstamp = jiffies; 2947 inet6_ifinfo_notify(RTM_NEWLINK, idev); 2948 2949 /* 2950 * If the changed mtu during down is lower than 2951 * IPV6_MIN_MTU stop IPv6 on this interface. 2952 */ 2953 if (dev->mtu < IPV6_MIN_MTU) 2954 addrconf_ifdown(dev, 1); 2955 } 2956 break; 2957 2958 case NETDEV_CHANGEMTU: 2959 if (idev && dev->mtu >= IPV6_MIN_MTU) { 2960 rt6_mtu_change(dev, dev->mtu); 2961 idev->cnf.mtu6 = dev->mtu; 2962 break; 2963 } 2964 2965 if (!idev && dev->mtu >= IPV6_MIN_MTU) { 2966 idev = ipv6_add_dev(dev); 2967 if (!IS_ERR(idev)) 2968 break; 2969 } 2970 2971 /* 2972 * if MTU under IPV6_MIN_MTU. 2973 * Stop IPv6 on this interface. 2974 */ 2975 2976 case NETDEV_DOWN: 2977 case NETDEV_UNREGISTER: 2978 /* 2979 * Remove all addresses from this interface. 2980 */ 2981 addrconf_ifdown(dev, event != NETDEV_DOWN); 2982 break; 2983 2984 case NETDEV_CHANGENAME: 2985 if (idev) { 2986 snmp6_unregister_dev(idev); 2987 addrconf_sysctl_unregister(idev); 2988 err = addrconf_sysctl_register(idev); 2989 if (err) 2990 return notifier_from_errno(err); 2991 err = snmp6_register_dev(idev); 2992 if (err) { 2993 addrconf_sysctl_unregister(idev); 2994 return notifier_from_errno(err); 2995 } 2996 } 2997 break; 2998 2999 case NETDEV_PRE_TYPE_CHANGE: 3000 case NETDEV_POST_TYPE_CHANGE: 3001 addrconf_type_change(dev, event); 3002 break; 3003 } 3004 3005 return NOTIFY_OK; 3006 } 3007 3008 /* 3009 * addrconf module should be notified of a device going up 3010 */ 3011 static struct notifier_block ipv6_dev_notf = { 3012 .notifier_call = addrconf_notify, 3013 }; 3014 3015 static void addrconf_type_change(struct net_device *dev, unsigned long event) 3016 { 3017 struct inet6_dev *idev; 3018 ASSERT_RTNL(); 3019 3020 idev = __in6_dev_get(dev); 3021 3022 if (event == NETDEV_POST_TYPE_CHANGE) 3023 ipv6_mc_remap(idev); 3024 else if (event == NETDEV_PRE_TYPE_CHANGE) 3025 ipv6_mc_unmap(idev); 3026 } 3027 3028 static int addrconf_ifdown(struct net_device *dev, int how) 3029 { 3030 struct net *net = dev_net(dev); 3031 struct inet6_dev *idev; 3032 struct inet6_ifaddr *ifa; 3033 int state, i; 3034 3035 ASSERT_RTNL(); 3036 3037 rt6_ifdown(net, dev); 3038 neigh_ifdown(&nd_tbl, dev); 3039 3040 idev = __in6_dev_get(dev); 3041 if (idev == NULL) 3042 return -ENODEV; 3043 3044 /* 3045 * Step 1: remove reference to ipv6 device from parent device. 3046 * Do not dev_put! 3047 */ 3048 if (how) { 3049 idev->dead = 1; 3050 3051 /* protected by rtnl_lock */ 3052 RCU_INIT_POINTER(dev->ip6_ptr, NULL); 3053 3054 /* Step 1.5: remove snmp6 entry */ 3055 snmp6_unregister_dev(idev); 3056 3057 } 3058 3059 /* Step 2: clear hash table */ 3060 for (i = 0; i < IN6_ADDR_HSIZE; i++) { 3061 struct hlist_head *h = &inet6_addr_lst[i]; 3062 3063 spin_lock_bh(&addrconf_hash_lock); 3064 restart: 3065 hlist_for_each_entry_rcu(ifa, h, addr_lst) { 3066 if (ifa->idev == idev) { 3067 hlist_del_init_rcu(&ifa->addr_lst); 3068 addrconf_del_dad_work(ifa); 3069 goto restart; 3070 } 3071 } 3072 spin_unlock_bh(&addrconf_hash_lock); 3073 } 3074 3075 write_lock_bh(&idev->lock); 3076 3077 addrconf_del_rs_timer(idev); 3078 3079 /* Step 2: clear flags for stateless addrconf */ 3080 if (!how) 3081 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY); 3082 3083 if (how && del_timer(&idev->regen_timer)) 3084 in6_dev_put(idev); 3085 3086 /* Step 3: clear tempaddr list */ 3087 while (!list_empty(&idev->tempaddr_list)) { 3088 ifa = list_first_entry(&idev->tempaddr_list, 3089 struct inet6_ifaddr, tmp_list); 3090 list_del(&ifa->tmp_list); 3091 write_unlock_bh(&idev->lock); 3092 spin_lock_bh(&ifa->lock); 3093 3094 if (ifa->ifpub) { 3095 in6_ifa_put(ifa->ifpub); 3096 ifa->ifpub = NULL; 3097 } 3098 spin_unlock_bh(&ifa->lock); 3099 in6_ifa_put(ifa); 3100 write_lock_bh(&idev->lock); 3101 } 3102 3103 while (!list_empty(&idev->addr_list)) { 3104 ifa = list_first_entry(&idev->addr_list, 3105 struct inet6_ifaddr, if_list); 3106 addrconf_del_dad_work(ifa); 3107 3108 list_del(&ifa->if_list); 3109 3110 write_unlock_bh(&idev->lock); 3111 3112 spin_lock_bh(&ifa->state_lock); 3113 state = ifa->state; 3114 ifa->state = INET6_IFADDR_STATE_DEAD; 3115 spin_unlock_bh(&ifa->state_lock); 3116 3117 if (state != INET6_IFADDR_STATE_DEAD) { 3118 __ipv6_ifa_notify(RTM_DELADDR, ifa); 3119 inet6addr_notifier_call_chain(NETDEV_DOWN, ifa); 3120 } 3121 in6_ifa_put(ifa); 3122 3123 write_lock_bh(&idev->lock); 3124 } 3125 3126 write_unlock_bh(&idev->lock); 3127 3128 /* Step 5: Discard anycast and multicast list */ 3129 if (how) { 3130 ipv6_ac_destroy_dev(idev); 3131 ipv6_mc_destroy_dev(idev); 3132 } else { 3133 ipv6_mc_down(idev); 3134 } 3135 3136 idev->tstamp = jiffies; 3137 3138 /* Last: Shot the device (if unregistered) */ 3139 if (how) { 3140 addrconf_sysctl_unregister(idev); 3141 neigh_parms_release(&nd_tbl, idev->nd_parms); 3142 neigh_ifdown(&nd_tbl, dev); 3143 in6_dev_put(idev); 3144 } 3145 return 0; 3146 } 3147 3148 static void addrconf_rs_timer(unsigned long data) 3149 { 3150 struct inet6_dev *idev = (struct inet6_dev *)data; 3151 struct net_device *dev = idev->dev; 3152 struct in6_addr lladdr; 3153 3154 write_lock(&idev->lock); 3155 if (idev->dead || !(idev->if_flags & IF_READY)) 3156 goto out; 3157 3158 if (!ipv6_accept_ra(idev)) 3159 goto out; 3160 3161 /* Announcement received after solicitation was sent */ 3162 if (idev->if_flags & IF_RA_RCVD) 3163 goto out; 3164 3165 if (idev->rs_probes++ < idev->cnf.rtr_solicits) { 3166 write_unlock(&idev->lock); 3167 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE)) 3168 ndisc_send_rs(dev, &lladdr, 3169 &in6addr_linklocal_allrouters); 3170 else 3171 goto put; 3172 3173 write_lock(&idev->lock); 3174 /* The wait after the last probe can be shorter */ 3175 addrconf_mod_rs_timer(idev, (idev->rs_probes == 3176 idev->cnf.rtr_solicits) ? 3177 idev->cnf.rtr_solicit_delay : 3178 idev->cnf.rtr_solicit_interval); 3179 } else { 3180 /* 3181 * Note: we do not support deprecated "all on-link" 3182 * assumption any longer. 3183 */ 3184 pr_debug("%s: no IPv6 routers present\n", idev->dev->name); 3185 } 3186 3187 out: 3188 write_unlock(&idev->lock); 3189 put: 3190 in6_dev_put(idev); 3191 } 3192 3193 /* 3194 * Duplicate Address Detection 3195 */ 3196 static void addrconf_dad_kick(struct inet6_ifaddr *ifp) 3197 { 3198 unsigned long rand_num; 3199 struct inet6_dev *idev = ifp->idev; 3200 3201 if (ifp->flags & IFA_F_OPTIMISTIC) 3202 rand_num = 0; 3203 else 3204 rand_num = prandom_u32() % (idev->cnf.rtr_solicit_delay ? : 1); 3205 3206 ifp->dad_probes = idev->cnf.dad_transmits; 3207 addrconf_mod_dad_work(ifp, rand_num); 3208 } 3209 3210 static void addrconf_dad_begin(struct inet6_ifaddr *ifp) 3211 { 3212 struct inet6_dev *idev = ifp->idev; 3213 struct net_device *dev = idev->dev; 3214 3215 addrconf_join_solict(dev, &ifp->addr); 3216 3217 prandom_seed((__force u32) ifp->addr.s6_addr32[3]); 3218 3219 read_lock_bh(&idev->lock); 3220 spin_lock(&ifp->lock); 3221 if (ifp->state == INET6_IFADDR_STATE_DEAD) 3222 goto out; 3223 3224 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) || 3225 idev->cnf.accept_dad < 1 || 3226 !(ifp->flags&IFA_F_TENTATIVE) || 3227 ifp->flags & IFA_F_NODAD) { 3228 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED); 3229 spin_unlock(&ifp->lock); 3230 read_unlock_bh(&idev->lock); 3231 3232 addrconf_dad_completed(ifp); 3233 return; 3234 } 3235 3236 if (!(idev->if_flags & IF_READY)) { 3237 spin_unlock(&ifp->lock); 3238 read_unlock_bh(&idev->lock); 3239 /* 3240 * If the device is not ready: 3241 * - keep it tentative if it is a permanent address. 3242 * - otherwise, kill it. 3243 */ 3244 in6_ifa_hold(ifp); 3245 addrconf_dad_stop(ifp, 0); 3246 return; 3247 } 3248 3249 /* 3250 * Optimistic nodes can start receiving 3251 * Frames right away 3252 */ 3253 if (ifp->flags & IFA_F_OPTIMISTIC) { 3254 ip6_ins_rt(ifp->rt); 3255 if (ipv6_use_optimistic_addr(idev)) { 3256 /* Because optimistic nodes can use this address, 3257 * notify listeners. If DAD fails, RTM_DELADDR is sent. 3258 */ 3259 ipv6_ifa_notify(RTM_NEWADDR, ifp); 3260 } 3261 } 3262 3263 addrconf_dad_kick(ifp); 3264 out: 3265 spin_unlock(&ifp->lock); 3266 read_unlock_bh(&idev->lock); 3267 } 3268 3269 static void addrconf_dad_start(struct inet6_ifaddr *ifp) 3270 { 3271 bool begin_dad = false; 3272 3273 spin_lock_bh(&ifp->state_lock); 3274 if (ifp->state != INET6_IFADDR_STATE_DEAD) { 3275 ifp->state = INET6_IFADDR_STATE_PREDAD; 3276 begin_dad = true; 3277 } 3278 spin_unlock_bh(&ifp->state_lock); 3279 3280 if (begin_dad) 3281 addrconf_mod_dad_work(ifp, 0); 3282 } 3283 3284 static void addrconf_dad_work(struct work_struct *w) 3285 { 3286 struct inet6_ifaddr *ifp = container_of(to_delayed_work(w), 3287 struct inet6_ifaddr, 3288 dad_work); 3289 struct inet6_dev *idev = ifp->idev; 3290 struct in6_addr mcaddr; 3291 3292 enum { 3293 DAD_PROCESS, 3294 DAD_BEGIN, 3295 DAD_ABORT, 3296 } action = DAD_PROCESS; 3297 3298 rtnl_lock(); 3299 3300 spin_lock_bh(&ifp->state_lock); 3301 if (ifp->state == INET6_IFADDR_STATE_PREDAD) { 3302 action = DAD_BEGIN; 3303 ifp->state = INET6_IFADDR_STATE_DAD; 3304 } else if (ifp->state == INET6_IFADDR_STATE_ERRDAD) { 3305 action = DAD_ABORT; 3306 ifp->state = INET6_IFADDR_STATE_POSTDAD; 3307 } 3308 spin_unlock_bh(&ifp->state_lock); 3309 3310 if (action == DAD_BEGIN) { 3311 addrconf_dad_begin(ifp); 3312 goto out; 3313 } else if (action == DAD_ABORT) { 3314 addrconf_dad_stop(ifp, 1); 3315 goto out; 3316 } 3317 3318 if (!ifp->dad_probes && addrconf_dad_end(ifp)) 3319 goto out; 3320 3321 write_lock_bh(&idev->lock); 3322 if (idev->dead || !(idev->if_flags & IF_READY)) { 3323 write_unlock_bh(&idev->lock); 3324 goto out; 3325 } 3326 3327 spin_lock(&ifp->lock); 3328 if (ifp->state == INET6_IFADDR_STATE_DEAD) { 3329 spin_unlock(&ifp->lock); 3330 write_unlock_bh(&idev->lock); 3331 goto out; 3332 } 3333 3334 if (ifp->dad_probes == 0) { 3335 /* 3336 * DAD was successful 3337 */ 3338 3339 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED); 3340 spin_unlock(&ifp->lock); 3341 write_unlock_bh(&idev->lock); 3342 3343 addrconf_dad_completed(ifp); 3344 3345 goto out; 3346 } 3347 3348 ifp->dad_probes--; 3349 addrconf_mod_dad_work(ifp, 3350 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME)); 3351 spin_unlock(&ifp->lock); 3352 write_unlock_bh(&idev->lock); 3353 3354 /* send a neighbour solicitation for our addr */ 3355 addrconf_addr_solict_mult(&ifp->addr, &mcaddr); 3356 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &in6addr_any); 3357 out: 3358 in6_ifa_put(ifp); 3359 rtnl_unlock(); 3360 } 3361 3362 /* ifp->idev must be at least read locked */ 3363 static bool ipv6_lonely_lladdr(struct inet6_ifaddr *ifp) 3364 { 3365 struct inet6_ifaddr *ifpiter; 3366 struct inet6_dev *idev = ifp->idev; 3367 3368 list_for_each_entry_reverse(ifpiter, &idev->addr_list, if_list) { 3369 if (ifpiter->scope > IFA_LINK) 3370 break; 3371 if (ifp != ifpiter && ifpiter->scope == IFA_LINK && 3372 (ifpiter->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE| 3373 IFA_F_OPTIMISTIC|IFA_F_DADFAILED)) == 3374 IFA_F_PERMANENT) 3375 return false; 3376 } 3377 return true; 3378 } 3379 3380 static void addrconf_dad_completed(struct inet6_ifaddr *ifp) 3381 { 3382 struct net_device *dev = ifp->idev->dev; 3383 struct in6_addr lladdr; 3384 bool send_rs, send_mld; 3385 3386 addrconf_del_dad_work(ifp); 3387 3388 /* 3389 * Configure the address for reception. Now it is valid. 3390 */ 3391 3392 ipv6_ifa_notify(RTM_NEWADDR, ifp); 3393 3394 /* If added prefix is link local and we are prepared to process 3395 router advertisements, start sending router solicitations. 3396 */ 3397 3398 read_lock_bh(&ifp->idev->lock); 3399 send_mld = ifp->scope == IFA_LINK && ipv6_lonely_lladdr(ifp); 3400 send_rs = send_mld && 3401 ipv6_accept_ra(ifp->idev) && 3402 ifp->idev->cnf.rtr_solicits > 0 && 3403 (dev->flags&IFF_LOOPBACK) == 0; 3404 read_unlock_bh(&ifp->idev->lock); 3405 3406 /* While dad is in progress mld report's source address is in6_addrany. 3407 * Resend with proper ll now. 3408 */ 3409 if (send_mld) 3410 ipv6_mc_dad_complete(ifp->idev); 3411 3412 if (send_rs) { 3413 /* 3414 * If a host as already performed a random delay 3415 * [...] as part of DAD [...] there is no need 3416 * to delay again before sending the first RS 3417 */ 3418 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE)) 3419 return; 3420 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters); 3421 3422 write_lock_bh(&ifp->idev->lock); 3423 spin_lock(&ifp->lock); 3424 ifp->idev->rs_probes = 1; 3425 ifp->idev->if_flags |= IF_RS_SENT; 3426 addrconf_mod_rs_timer(ifp->idev, 3427 ifp->idev->cnf.rtr_solicit_interval); 3428 spin_unlock(&ifp->lock); 3429 write_unlock_bh(&ifp->idev->lock); 3430 } 3431 } 3432 3433 static void addrconf_dad_run(struct inet6_dev *idev) 3434 { 3435 struct inet6_ifaddr *ifp; 3436 3437 read_lock_bh(&idev->lock); 3438 list_for_each_entry(ifp, &idev->addr_list, if_list) { 3439 spin_lock(&ifp->lock); 3440 if (ifp->flags & IFA_F_TENTATIVE && 3441 ifp->state == INET6_IFADDR_STATE_DAD) 3442 addrconf_dad_kick(ifp); 3443 spin_unlock(&ifp->lock); 3444 } 3445 read_unlock_bh(&idev->lock); 3446 } 3447 3448 #ifdef CONFIG_PROC_FS 3449 struct if6_iter_state { 3450 struct seq_net_private p; 3451 int bucket; 3452 int offset; 3453 }; 3454 3455 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos) 3456 { 3457 struct inet6_ifaddr *ifa = NULL; 3458 struct if6_iter_state *state = seq->private; 3459 struct net *net = seq_file_net(seq); 3460 int p = 0; 3461 3462 /* initial bucket if pos is 0 */ 3463 if (pos == 0) { 3464 state->bucket = 0; 3465 state->offset = 0; 3466 } 3467 3468 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) { 3469 hlist_for_each_entry_rcu_bh(ifa, &inet6_addr_lst[state->bucket], 3470 addr_lst) { 3471 if (!net_eq(dev_net(ifa->idev->dev), net)) 3472 continue; 3473 /* sync with offset */ 3474 if (p < state->offset) { 3475 p++; 3476 continue; 3477 } 3478 state->offset++; 3479 return ifa; 3480 } 3481 3482 /* prepare for next bucket */ 3483 state->offset = 0; 3484 p = 0; 3485 } 3486 return NULL; 3487 } 3488 3489 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, 3490 struct inet6_ifaddr *ifa) 3491 { 3492 struct if6_iter_state *state = seq->private; 3493 struct net *net = seq_file_net(seq); 3494 3495 hlist_for_each_entry_continue_rcu_bh(ifa, addr_lst) { 3496 if (!net_eq(dev_net(ifa->idev->dev), net)) 3497 continue; 3498 state->offset++; 3499 return ifa; 3500 } 3501 3502 while (++state->bucket < IN6_ADDR_HSIZE) { 3503 state->offset = 0; 3504 hlist_for_each_entry_rcu_bh(ifa, 3505 &inet6_addr_lst[state->bucket], addr_lst) { 3506 if (!net_eq(dev_net(ifa->idev->dev), net)) 3507 continue; 3508 state->offset++; 3509 return ifa; 3510 } 3511 } 3512 3513 return NULL; 3514 } 3515 3516 static void *if6_seq_start(struct seq_file *seq, loff_t *pos) 3517 __acquires(rcu_bh) 3518 { 3519 rcu_read_lock_bh(); 3520 return if6_get_first(seq, *pos); 3521 } 3522 3523 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos) 3524 { 3525 struct inet6_ifaddr *ifa; 3526 3527 ifa = if6_get_next(seq, v); 3528 ++*pos; 3529 return ifa; 3530 } 3531 3532 static void if6_seq_stop(struct seq_file *seq, void *v) 3533 __releases(rcu_bh) 3534 { 3535 rcu_read_unlock_bh(); 3536 } 3537 3538 static int if6_seq_show(struct seq_file *seq, void *v) 3539 { 3540 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v; 3541 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n", 3542 &ifp->addr, 3543 ifp->idev->dev->ifindex, 3544 ifp->prefix_len, 3545 ifp->scope, 3546 (u8) ifp->flags, 3547 ifp->idev->dev->name); 3548 return 0; 3549 } 3550 3551 static const struct seq_operations if6_seq_ops = { 3552 .start = if6_seq_start, 3553 .next = if6_seq_next, 3554 .show = if6_seq_show, 3555 .stop = if6_seq_stop, 3556 }; 3557 3558 static int if6_seq_open(struct inode *inode, struct file *file) 3559 { 3560 return seq_open_net(inode, file, &if6_seq_ops, 3561 sizeof(struct if6_iter_state)); 3562 } 3563 3564 static const struct file_operations if6_fops = { 3565 .owner = THIS_MODULE, 3566 .open = if6_seq_open, 3567 .read = seq_read, 3568 .llseek = seq_lseek, 3569 .release = seq_release_net, 3570 }; 3571 3572 static int __net_init if6_proc_net_init(struct net *net) 3573 { 3574 if (!proc_create("if_inet6", S_IRUGO, net->proc_net, &if6_fops)) 3575 return -ENOMEM; 3576 return 0; 3577 } 3578 3579 static void __net_exit if6_proc_net_exit(struct net *net) 3580 { 3581 remove_proc_entry("if_inet6", net->proc_net); 3582 } 3583 3584 static struct pernet_operations if6_proc_net_ops = { 3585 .init = if6_proc_net_init, 3586 .exit = if6_proc_net_exit, 3587 }; 3588 3589 int __init if6_proc_init(void) 3590 { 3591 return register_pernet_subsys(&if6_proc_net_ops); 3592 } 3593 3594 void if6_proc_exit(void) 3595 { 3596 unregister_pernet_subsys(&if6_proc_net_ops); 3597 } 3598 #endif /* CONFIG_PROC_FS */ 3599 3600 #if IS_ENABLED(CONFIG_IPV6_MIP6) 3601 /* Check if address is a home address configured on any interface. */ 3602 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr) 3603 { 3604 int ret = 0; 3605 struct inet6_ifaddr *ifp = NULL; 3606 unsigned int hash = inet6_addr_hash(addr); 3607 3608 rcu_read_lock_bh(); 3609 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) { 3610 if (!net_eq(dev_net(ifp->idev->dev), net)) 3611 continue; 3612 if (ipv6_addr_equal(&ifp->addr, addr) && 3613 (ifp->flags & IFA_F_HOMEADDRESS)) { 3614 ret = 1; 3615 break; 3616 } 3617 } 3618 rcu_read_unlock_bh(); 3619 return ret; 3620 } 3621 #endif 3622 3623 /* 3624 * Periodic address status verification 3625 */ 3626 3627 static void addrconf_verify_rtnl(void) 3628 { 3629 unsigned long now, next, next_sec, next_sched; 3630 struct inet6_ifaddr *ifp; 3631 int i; 3632 3633 ASSERT_RTNL(); 3634 3635 rcu_read_lock_bh(); 3636 now = jiffies; 3637 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY); 3638 3639 cancel_delayed_work(&addr_chk_work); 3640 3641 for (i = 0; i < IN6_ADDR_HSIZE; i++) { 3642 restart: 3643 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[i], addr_lst) { 3644 unsigned long age; 3645 3646 /* When setting preferred_lft to a value not zero or 3647 * infinity, while valid_lft is infinity 3648 * IFA_F_PERMANENT has a non-infinity life time. 3649 */ 3650 if ((ifp->flags & IFA_F_PERMANENT) && 3651 (ifp->prefered_lft == INFINITY_LIFE_TIME)) 3652 continue; 3653 3654 spin_lock(&ifp->lock); 3655 /* We try to batch several events at once. */ 3656 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ; 3657 3658 if (ifp->valid_lft != INFINITY_LIFE_TIME && 3659 age >= ifp->valid_lft) { 3660 spin_unlock(&ifp->lock); 3661 in6_ifa_hold(ifp); 3662 ipv6_del_addr(ifp); 3663 goto restart; 3664 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) { 3665 spin_unlock(&ifp->lock); 3666 continue; 3667 } else if (age >= ifp->prefered_lft) { 3668 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */ 3669 int deprecate = 0; 3670 3671 if (!(ifp->flags&IFA_F_DEPRECATED)) { 3672 deprecate = 1; 3673 ifp->flags |= IFA_F_DEPRECATED; 3674 } 3675 3676 if ((ifp->valid_lft != INFINITY_LIFE_TIME) && 3677 (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))) 3678 next = ifp->tstamp + ifp->valid_lft * HZ; 3679 3680 spin_unlock(&ifp->lock); 3681 3682 if (deprecate) { 3683 in6_ifa_hold(ifp); 3684 3685 ipv6_ifa_notify(0, ifp); 3686 in6_ifa_put(ifp); 3687 goto restart; 3688 } 3689 } else if ((ifp->flags&IFA_F_TEMPORARY) && 3690 !(ifp->flags&IFA_F_TENTATIVE)) { 3691 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry * 3692 ifp->idev->cnf.dad_transmits * 3693 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME) / HZ; 3694 3695 if (age >= ifp->prefered_lft - regen_advance) { 3696 struct inet6_ifaddr *ifpub = ifp->ifpub; 3697 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 3698 next = ifp->tstamp + ifp->prefered_lft * HZ; 3699 if (!ifp->regen_count && ifpub) { 3700 ifp->regen_count++; 3701 in6_ifa_hold(ifp); 3702 in6_ifa_hold(ifpub); 3703 spin_unlock(&ifp->lock); 3704 3705 spin_lock(&ifpub->lock); 3706 ifpub->regen_count = 0; 3707 spin_unlock(&ifpub->lock); 3708 ipv6_create_tempaddr(ifpub, ifp); 3709 in6_ifa_put(ifpub); 3710 in6_ifa_put(ifp); 3711 goto restart; 3712 } 3713 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next)) 3714 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ; 3715 spin_unlock(&ifp->lock); 3716 } else { 3717 /* ifp->prefered_lft <= ifp->valid_lft */ 3718 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 3719 next = ifp->tstamp + ifp->prefered_lft * HZ; 3720 spin_unlock(&ifp->lock); 3721 } 3722 } 3723 } 3724 3725 next_sec = round_jiffies_up(next); 3726 next_sched = next; 3727 3728 /* If rounded timeout is accurate enough, accept it. */ 3729 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ)) 3730 next_sched = next_sec; 3731 3732 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */ 3733 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX)) 3734 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX; 3735 3736 ADBG(KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n", 3737 now, next, next_sec, next_sched); 3738 mod_delayed_work(addrconf_wq, &addr_chk_work, next_sched - now); 3739 rcu_read_unlock_bh(); 3740 } 3741 3742 static void addrconf_verify_work(struct work_struct *w) 3743 { 3744 rtnl_lock(); 3745 addrconf_verify_rtnl(); 3746 rtnl_unlock(); 3747 } 3748 3749 static void addrconf_verify(void) 3750 { 3751 mod_delayed_work(addrconf_wq, &addr_chk_work, 0); 3752 } 3753 3754 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local, 3755 struct in6_addr **peer_pfx) 3756 { 3757 struct in6_addr *pfx = NULL; 3758 3759 *peer_pfx = NULL; 3760 3761 if (addr) 3762 pfx = nla_data(addr); 3763 3764 if (local) { 3765 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx))) 3766 *peer_pfx = pfx; 3767 pfx = nla_data(local); 3768 } 3769 3770 return pfx; 3771 } 3772 3773 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = { 3774 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) }, 3775 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) }, 3776 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) }, 3777 [IFA_FLAGS] = { .len = sizeof(u32) }, 3778 }; 3779 3780 static int 3781 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh) 3782 { 3783 struct net *net = sock_net(skb->sk); 3784 struct ifaddrmsg *ifm; 3785 struct nlattr *tb[IFA_MAX+1]; 3786 struct in6_addr *pfx, *peer_pfx; 3787 u32 ifa_flags; 3788 int err; 3789 3790 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy); 3791 if (err < 0) 3792 return err; 3793 3794 ifm = nlmsg_data(nlh); 3795 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx); 3796 if (pfx == NULL) 3797 return -EINVAL; 3798 3799 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags; 3800 3801 /* We ignore other flags so far. */ 3802 ifa_flags &= IFA_F_MANAGETEMPADDR; 3803 3804 return inet6_addr_del(net, ifm->ifa_index, ifa_flags, pfx, 3805 ifm->ifa_prefixlen); 3806 } 3807 3808 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u32 ifa_flags, 3809 u32 prefered_lft, u32 valid_lft) 3810 { 3811 u32 flags; 3812 clock_t expires; 3813 unsigned long timeout; 3814 bool was_managetempaddr; 3815 bool had_prefixroute; 3816 3817 ASSERT_RTNL(); 3818 3819 if (!valid_lft || (prefered_lft > valid_lft)) 3820 return -EINVAL; 3821 3822 if (ifa_flags & IFA_F_MANAGETEMPADDR && 3823 (ifp->flags & IFA_F_TEMPORARY || ifp->prefix_len != 64)) 3824 return -EINVAL; 3825 3826 timeout = addrconf_timeout_fixup(valid_lft, HZ); 3827 if (addrconf_finite_timeout(timeout)) { 3828 expires = jiffies_to_clock_t(timeout * HZ); 3829 valid_lft = timeout; 3830 flags = RTF_EXPIRES; 3831 } else { 3832 expires = 0; 3833 flags = 0; 3834 ifa_flags |= IFA_F_PERMANENT; 3835 } 3836 3837 timeout = addrconf_timeout_fixup(prefered_lft, HZ); 3838 if (addrconf_finite_timeout(timeout)) { 3839 if (timeout == 0) 3840 ifa_flags |= IFA_F_DEPRECATED; 3841 prefered_lft = timeout; 3842 } 3843 3844 spin_lock_bh(&ifp->lock); 3845 was_managetempaddr = ifp->flags & IFA_F_MANAGETEMPADDR; 3846 had_prefixroute = ifp->flags & IFA_F_PERMANENT && 3847 !(ifp->flags & IFA_F_NOPREFIXROUTE); 3848 ifp->flags &= ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | 3849 IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR | 3850 IFA_F_NOPREFIXROUTE); 3851 ifp->flags |= ifa_flags; 3852 ifp->tstamp = jiffies; 3853 ifp->valid_lft = valid_lft; 3854 ifp->prefered_lft = prefered_lft; 3855 3856 spin_unlock_bh(&ifp->lock); 3857 if (!(ifp->flags&IFA_F_TENTATIVE)) 3858 ipv6_ifa_notify(0, ifp); 3859 3860 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) { 3861 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev, 3862 expires, flags); 3863 } else if (had_prefixroute) { 3864 enum cleanup_prefix_rt_t action; 3865 unsigned long rt_expires; 3866 3867 write_lock_bh(&ifp->idev->lock); 3868 action = check_cleanup_prefix_route(ifp, &rt_expires); 3869 write_unlock_bh(&ifp->idev->lock); 3870 3871 if (action != CLEANUP_PREFIX_RT_NOP) { 3872 cleanup_prefix_route(ifp, rt_expires, 3873 action == CLEANUP_PREFIX_RT_DEL); 3874 } 3875 } 3876 3877 if (was_managetempaddr || ifp->flags & IFA_F_MANAGETEMPADDR) { 3878 if (was_managetempaddr && !(ifp->flags & IFA_F_MANAGETEMPADDR)) 3879 valid_lft = prefered_lft = 0; 3880 manage_tempaddrs(ifp->idev, ifp, valid_lft, prefered_lft, 3881 !was_managetempaddr, jiffies); 3882 } 3883 3884 addrconf_verify_rtnl(); 3885 3886 return 0; 3887 } 3888 3889 static int 3890 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh) 3891 { 3892 struct net *net = sock_net(skb->sk); 3893 struct ifaddrmsg *ifm; 3894 struct nlattr *tb[IFA_MAX+1]; 3895 struct in6_addr *pfx, *peer_pfx; 3896 struct inet6_ifaddr *ifa; 3897 struct net_device *dev; 3898 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME; 3899 u32 ifa_flags; 3900 int err; 3901 3902 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy); 3903 if (err < 0) 3904 return err; 3905 3906 ifm = nlmsg_data(nlh); 3907 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx); 3908 if (pfx == NULL) 3909 return -EINVAL; 3910 3911 if (tb[IFA_CACHEINFO]) { 3912 struct ifa_cacheinfo *ci; 3913 3914 ci = nla_data(tb[IFA_CACHEINFO]); 3915 valid_lft = ci->ifa_valid; 3916 preferred_lft = ci->ifa_prefered; 3917 } else { 3918 preferred_lft = INFINITY_LIFE_TIME; 3919 valid_lft = INFINITY_LIFE_TIME; 3920 } 3921 3922 dev = __dev_get_by_index(net, ifm->ifa_index); 3923 if (dev == NULL) 3924 return -ENODEV; 3925 3926 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags; 3927 3928 /* We ignore other flags so far. */ 3929 ifa_flags &= IFA_F_NODAD | IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR | 3930 IFA_F_NOPREFIXROUTE; 3931 3932 ifa = ipv6_get_ifaddr(net, pfx, dev, 1); 3933 if (ifa == NULL) { 3934 /* 3935 * It would be best to check for !NLM_F_CREATE here but 3936 * userspace already relies on not having to provide this. 3937 */ 3938 return inet6_addr_add(net, ifm->ifa_index, pfx, peer_pfx, 3939 ifm->ifa_prefixlen, ifa_flags, 3940 preferred_lft, valid_lft); 3941 } 3942 3943 if (nlh->nlmsg_flags & NLM_F_EXCL || 3944 !(nlh->nlmsg_flags & NLM_F_REPLACE)) 3945 err = -EEXIST; 3946 else 3947 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft); 3948 3949 in6_ifa_put(ifa); 3950 3951 return err; 3952 } 3953 3954 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u32 flags, 3955 u8 scope, int ifindex) 3956 { 3957 struct ifaddrmsg *ifm; 3958 3959 ifm = nlmsg_data(nlh); 3960 ifm->ifa_family = AF_INET6; 3961 ifm->ifa_prefixlen = prefixlen; 3962 ifm->ifa_flags = flags; 3963 ifm->ifa_scope = scope; 3964 ifm->ifa_index = ifindex; 3965 } 3966 3967 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp, 3968 unsigned long tstamp, u32 preferred, u32 valid) 3969 { 3970 struct ifa_cacheinfo ci; 3971 3972 ci.cstamp = cstamp_delta(cstamp); 3973 ci.tstamp = cstamp_delta(tstamp); 3974 ci.ifa_prefered = preferred; 3975 ci.ifa_valid = valid; 3976 3977 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci); 3978 } 3979 3980 static inline int rt_scope(int ifa_scope) 3981 { 3982 if (ifa_scope & IFA_HOST) 3983 return RT_SCOPE_HOST; 3984 else if (ifa_scope & IFA_LINK) 3985 return RT_SCOPE_LINK; 3986 else if (ifa_scope & IFA_SITE) 3987 return RT_SCOPE_SITE; 3988 else 3989 return RT_SCOPE_UNIVERSE; 3990 } 3991 3992 static inline int inet6_ifaddr_msgsize(void) 3993 { 3994 return NLMSG_ALIGN(sizeof(struct ifaddrmsg)) 3995 + nla_total_size(16) /* IFA_LOCAL */ 3996 + nla_total_size(16) /* IFA_ADDRESS */ 3997 + nla_total_size(sizeof(struct ifa_cacheinfo)) 3998 + nla_total_size(4) /* IFA_FLAGS */; 3999 } 4000 4001 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa, 4002 u32 portid, u32 seq, int event, unsigned int flags) 4003 { 4004 struct nlmsghdr *nlh; 4005 u32 preferred, valid; 4006 4007 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags); 4008 if (nlh == NULL) 4009 return -EMSGSIZE; 4010 4011 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope), 4012 ifa->idev->dev->ifindex); 4013 4014 if (!((ifa->flags&IFA_F_PERMANENT) && 4015 (ifa->prefered_lft == INFINITY_LIFE_TIME))) { 4016 preferred = ifa->prefered_lft; 4017 valid = ifa->valid_lft; 4018 if (preferred != INFINITY_LIFE_TIME) { 4019 long tval = (jiffies - ifa->tstamp)/HZ; 4020 if (preferred > tval) 4021 preferred -= tval; 4022 else 4023 preferred = 0; 4024 if (valid != INFINITY_LIFE_TIME) { 4025 if (valid > tval) 4026 valid -= tval; 4027 else 4028 valid = 0; 4029 } 4030 } 4031 } else { 4032 preferred = INFINITY_LIFE_TIME; 4033 valid = INFINITY_LIFE_TIME; 4034 } 4035 4036 if (!ipv6_addr_any(&ifa->peer_addr)) { 4037 if (nla_put(skb, IFA_LOCAL, 16, &ifa->addr) < 0 || 4038 nla_put(skb, IFA_ADDRESS, 16, &ifa->peer_addr) < 0) 4039 goto error; 4040 } else 4041 if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0) 4042 goto error; 4043 4044 if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) 4045 goto error; 4046 4047 if (nla_put_u32(skb, IFA_FLAGS, ifa->flags) < 0) 4048 goto error; 4049 4050 return nlmsg_end(skb, nlh); 4051 4052 error: 4053 nlmsg_cancel(skb, nlh); 4054 return -EMSGSIZE; 4055 } 4056 4057 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca, 4058 u32 portid, u32 seq, int event, u16 flags) 4059 { 4060 struct nlmsghdr *nlh; 4061 u8 scope = RT_SCOPE_UNIVERSE; 4062 int ifindex = ifmca->idev->dev->ifindex; 4063 4064 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE) 4065 scope = RT_SCOPE_SITE; 4066 4067 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags); 4068 if (nlh == NULL) 4069 return -EMSGSIZE; 4070 4071 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 4072 if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 || 4073 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp, 4074 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 4075 nlmsg_cancel(skb, nlh); 4076 return -EMSGSIZE; 4077 } 4078 4079 return nlmsg_end(skb, nlh); 4080 } 4081 4082 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca, 4083 u32 portid, u32 seq, int event, unsigned int flags) 4084 { 4085 struct nlmsghdr *nlh; 4086 u8 scope = RT_SCOPE_UNIVERSE; 4087 int ifindex = ifaca->aca_idev->dev->ifindex; 4088 4089 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE) 4090 scope = RT_SCOPE_SITE; 4091 4092 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags); 4093 if (nlh == NULL) 4094 return -EMSGSIZE; 4095 4096 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 4097 if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 || 4098 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp, 4099 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 4100 nlmsg_cancel(skb, nlh); 4101 return -EMSGSIZE; 4102 } 4103 4104 return nlmsg_end(skb, nlh); 4105 } 4106 4107 enum addr_type_t { 4108 UNICAST_ADDR, 4109 MULTICAST_ADDR, 4110 ANYCAST_ADDR, 4111 }; 4112 4113 /* called with rcu_read_lock() */ 4114 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb, 4115 struct netlink_callback *cb, enum addr_type_t type, 4116 int s_ip_idx, int *p_ip_idx) 4117 { 4118 struct ifmcaddr6 *ifmca; 4119 struct ifacaddr6 *ifaca; 4120 int err = 1; 4121 int ip_idx = *p_ip_idx; 4122 4123 read_lock_bh(&idev->lock); 4124 switch (type) { 4125 case UNICAST_ADDR: { 4126 struct inet6_ifaddr *ifa; 4127 4128 /* unicast address incl. temp addr */ 4129 list_for_each_entry(ifa, &idev->addr_list, if_list) { 4130 if (++ip_idx < s_ip_idx) 4131 continue; 4132 err = inet6_fill_ifaddr(skb, ifa, 4133 NETLINK_CB(cb->skb).portid, 4134 cb->nlh->nlmsg_seq, 4135 RTM_NEWADDR, 4136 NLM_F_MULTI); 4137 if (err <= 0) 4138 break; 4139 nl_dump_check_consistent(cb, nlmsg_hdr(skb)); 4140 } 4141 break; 4142 } 4143 case MULTICAST_ADDR: 4144 /* multicast address */ 4145 for (ifmca = idev->mc_list; ifmca; 4146 ifmca = ifmca->next, ip_idx++) { 4147 if (ip_idx < s_ip_idx) 4148 continue; 4149 err = inet6_fill_ifmcaddr(skb, ifmca, 4150 NETLINK_CB(cb->skb).portid, 4151 cb->nlh->nlmsg_seq, 4152 RTM_GETMULTICAST, 4153 NLM_F_MULTI); 4154 if (err <= 0) 4155 break; 4156 } 4157 break; 4158 case ANYCAST_ADDR: 4159 /* anycast address */ 4160 for (ifaca = idev->ac_list; ifaca; 4161 ifaca = ifaca->aca_next, ip_idx++) { 4162 if (ip_idx < s_ip_idx) 4163 continue; 4164 err = inet6_fill_ifacaddr(skb, ifaca, 4165 NETLINK_CB(cb->skb).portid, 4166 cb->nlh->nlmsg_seq, 4167 RTM_GETANYCAST, 4168 NLM_F_MULTI); 4169 if (err <= 0) 4170 break; 4171 } 4172 break; 4173 default: 4174 break; 4175 } 4176 read_unlock_bh(&idev->lock); 4177 *p_ip_idx = ip_idx; 4178 return err; 4179 } 4180 4181 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb, 4182 enum addr_type_t type) 4183 { 4184 struct net *net = sock_net(skb->sk); 4185 int h, s_h; 4186 int idx, ip_idx; 4187 int s_idx, s_ip_idx; 4188 struct net_device *dev; 4189 struct inet6_dev *idev; 4190 struct hlist_head *head; 4191 4192 s_h = cb->args[0]; 4193 s_idx = idx = cb->args[1]; 4194 s_ip_idx = ip_idx = cb->args[2]; 4195 4196 rcu_read_lock(); 4197 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ net->dev_base_seq; 4198 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 4199 idx = 0; 4200 head = &net->dev_index_head[h]; 4201 hlist_for_each_entry_rcu(dev, head, index_hlist) { 4202 if (idx < s_idx) 4203 goto cont; 4204 if (h > s_h || idx > s_idx) 4205 s_ip_idx = 0; 4206 ip_idx = 0; 4207 idev = __in6_dev_get(dev); 4208 if (!idev) 4209 goto cont; 4210 4211 if (in6_dump_addrs(idev, skb, cb, type, 4212 s_ip_idx, &ip_idx) <= 0) 4213 goto done; 4214 cont: 4215 idx++; 4216 } 4217 } 4218 done: 4219 rcu_read_unlock(); 4220 cb->args[0] = h; 4221 cb->args[1] = idx; 4222 cb->args[2] = ip_idx; 4223 4224 return skb->len; 4225 } 4226 4227 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb) 4228 { 4229 enum addr_type_t type = UNICAST_ADDR; 4230 4231 return inet6_dump_addr(skb, cb, type); 4232 } 4233 4234 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb) 4235 { 4236 enum addr_type_t type = MULTICAST_ADDR; 4237 4238 return inet6_dump_addr(skb, cb, type); 4239 } 4240 4241 4242 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb) 4243 { 4244 enum addr_type_t type = ANYCAST_ADDR; 4245 4246 return inet6_dump_addr(skb, cb, type); 4247 } 4248 4249 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh) 4250 { 4251 struct net *net = sock_net(in_skb->sk); 4252 struct ifaddrmsg *ifm; 4253 struct nlattr *tb[IFA_MAX+1]; 4254 struct in6_addr *addr = NULL, *peer; 4255 struct net_device *dev = NULL; 4256 struct inet6_ifaddr *ifa; 4257 struct sk_buff *skb; 4258 int err; 4259 4260 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy); 4261 if (err < 0) 4262 goto errout; 4263 4264 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer); 4265 if (addr == NULL) { 4266 err = -EINVAL; 4267 goto errout; 4268 } 4269 4270 ifm = nlmsg_data(nlh); 4271 if (ifm->ifa_index) 4272 dev = __dev_get_by_index(net, ifm->ifa_index); 4273 4274 ifa = ipv6_get_ifaddr(net, addr, dev, 1); 4275 if (!ifa) { 4276 err = -EADDRNOTAVAIL; 4277 goto errout; 4278 } 4279 4280 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL); 4281 if (!skb) { 4282 err = -ENOBUFS; 4283 goto errout_ifa; 4284 } 4285 4286 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).portid, 4287 nlh->nlmsg_seq, RTM_NEWADDR, 0); 4288 if (err < 0) { 4289 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 4290 WARN_ON(err == -EMSGSIZE); 4291 kfree_skb(skb); 4292 goto errout_ifa; 4293 } 4294 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid); 4295 errout_ifa: 4296 in6_ifa_put(ifa); 4297 errout: 4298 return err; 4299 } 4300 4301 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa) 4302 { 4303 struct sk_buff *skb; 4304 struct net *net = dev_net(ifa->idev->dev); 4305 int err = -ENOBUFS; 4306 4307 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC); 4308 if (skb == NULL) 4309 goto errout; 4310 4311 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0); 4312 if (err < 0) { 4313 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 4314 WARN_ON(err == -EMSGSIZE); 4315 kfree_skb(skb); 4316 goto errout; 4317 } 4318 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC); 4319 return; 4320 errout: 4321 if (err < 0) 4322 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err); 4323 } 4324 4325 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf, 4326 __s32 *array, int bytes) 4327 { 4328 BUG_ON(bytes < (DEVCONF_MAX * 4)); 4329 4330 memset(array, 0, bytes); 4331 array[DEVCONF_FORWARDING] = cnf->forwarding; 4332 array[DEVCONF_HOPLIMIT] = cnf->hop_limit; 4333 array[DEVCONF_MTU6] = cnf->mtu6; 4334 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra; 4335 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects; 4336 array[DEVCONF_AUTOCONF] = cnf->autoconf; 4337 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits; 4338 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits; 4339 array[DEVCONF_RTR_SOLICIT_INTERVAL] = 4340 jiffies_to_msecs(cnf->rtr_solicit_interval); 4341 array[DEVCONF_RTR_SOLICIT_DELAY] = 4342 jiffies_to_msecs(cnf->rtr_solicit_delay); 4343 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version; 4344 array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] = 4345 jiffies_to_msecs(cnf->mldv1_unsolicited_report_interval); 4346 array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] = 4347 jiffies_to_msecs(cnf->mldv2_unsolicited_report_interval); 4348 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr; 4349 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft; 4350 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft; 4351 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry; 4352 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor; 4353 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses; 4354 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr; 4355 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo; 4356 #ifdef CONFIG_IPV6_ROUTER_PREF 4357 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref; 4358 array[DEVCONF_RTR_PROBE_INTERVAL] = 4359 jiffies_to_msecs(cnf->rtr_probe_interval); 4360 #ifdef CONFIG_IPV6_ROUTE_INFO 4361 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen; 4362 #endif 4363 #endif 4364 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp; 4365 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route; 4366 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 4367 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad; 4368 array[DEVCONF_USE_OPTIMISTIC] = cnf->use_optimistic; 4369 #endif 4370 #ifdef CONFIG_IPV6_MROUTE 4371 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding; 4372 #endif 4373 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6; 4374 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad; 4375 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao; 4376 array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify; 4377 array[DEVCONF_SUPPRESS_FRAG_NDISC] = cnf->suppress_frag_ndisc; 4378 array[DEVCONF_ACCEPT_RA_FROM_LOCAL] = cnf->accept_ra_from_local; 4379 } 4380 4381 static inline size_t inet6_ifla6_size(void) 4382 { 4383 return nla_total_size(4) /* IFLA_INET6_FLAGS */ 4384 + nla_total_size(sizeof(struct ifla_cacheinfo)) 4385 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */ 4386 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */ 4387 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */ 4388 + nla_total_size(sizeof(struct in6_addr)); /* IFLA_INET6_TOKEN */ 4389 } 4390 4391 static inline size_t inet6_if_nlmsg_size(void) 4392 { 4393 return NLMSG_ALIGN(sizeof(struct ifinfomsg)) 4394 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */ 4395 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */ 4396 + nla_total_size(4) /* IFLA_MTU */ 4397 + nla_total_size(4) /* IFLA_LINK */ 4398 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */ 4399 } 4400 4401 static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib, 4402 int items, int bytes) 4403 { 4404 int i; 4405 int pad = bytes - sizeof(u64) * items; 4406 BUG_ON(pad < 0); 4407 4408 /* Use put_unaligned() because stats may not be aligned for u64. */ 4409 put_unaligned(items, &stats[0]); 4410 for (i = 1; i < items; i++) 4411 put_unaligned(atomic_long_read(&mib[i]), &stats[i]); 4412 4413 memset(&stats[items], 0, pad); 4414 } 4415 4416 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu *mib, 4417 int items, int bytes, size_t syncpoff) 4418 { 4419 int i; 4420 int pad = bytes - sizeof(u64) * items; 4421 BUG_ON(pad < 0); 4422 4423 /* Use put_unaligned() because stats may not be aligned for u64. */ 4424 put_unaligned(items, &stats[0]); 4425 for (i = 1; i < items; i++) 4426 put_unaligned(snmp_fold_field64(mib, i, syncpoff), &stats[i]); 4427 4428 memset(&stats[items], 0, pad); 4429 } 4430 4431 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype, 4432 int bytes) 4433 { 4434 switch (attrtype) { 4435 case IFLA_INET6_STATS: 4436 __snmp6_fill_stats64(stats, idev->stats.ipv6, 4437 IPSTATS_MIB_MAX, bytes, offsetof(struct ipstats_mib, syncp)); 4438 break; 4439 case IFLA_INET6_ICMP6STATS: 4440 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, ICMP6_MIB_MAX, bytes); 4441 break; 4442 } 4443 } 4444 4445 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev) 4446 { 4447 struct nlattr *nla; 4448 struct ifla_cacheinfo ci; 4449 4450 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags)) 4451 goto nla_put_failure; 4452 ci.max_reasm_len = IPV6_MAXPLEN; 4453 ci.tstamp = cstamp_delta(idev->tstamp); 4454 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time); 4455 ci.retrans_time = jiffies_to_msecs(NEIGH_VAR(idev->nd_parms, RETRANS_TIME)); 4456 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci)) 4457 goto nla_put_failure; 4458 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32)); 4459 if (nla == NULL) 4460 goto nla_put_failure; 4461 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla)); 4462 4463 /* XXX - MC not implemented */ 4464 4465 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64)); 4466 if (nla == NULL) 4467 goto nla_put_failure; 4468 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla)); 4469 4470 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64)); 4471 if (nla == NULL) 4472 goto nla_put_failure; 4473 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla)); 4474 4475 nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr)); 4476 if (nla == NULL) 4477 goto nla_put_failure; 4478 4479 if (nla_put_u8(skb, IFLA_INET6_ADDR_GEN_MODE, idev->addr_gen_mode)) 4480 goto nla_put_failure; 4481 4482 read_lock_bh(&idev->lock); 4483 memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla)); 4484 read_unlock_bh(&idev->lock); 4485 4486 return 0; 4487 4488 nla_put_failure: 4489 return -EMSGSIZE; 4490 } 4491 4492 static size_t inet6_get_link_af_size(const struct net_device *dev) 4493 { 4494 if (!__in6_dev_get(dev)) 4495 return 0; 4496 4497 return inet6_ifla6_size(); 4498 } 4499 4500 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev) 4501 { 4502 struct inet6_dev *idev = __in6_dev_get(dev); 4503 4504 if (!idev) 4505 return -ENODATA; 4506 4507 if (inet6_fill_ifla6_attrs(skb, idev) < 0) 4508 return -EMSGSIZE; 4509 4510 return 0; 4511 } 4512 4513 static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token) 4514 { 4515 struct inet6_ifaddr *ifp; 4516 struct net_device *dev = idev->dev; 4517 bool update_rs = false; 4518 struct in6_addr ll_addr; 4519 4520 ASSERT_RTNL(); 4521 4522 if (token == NULL) 4523 return -EINVAL; 4524 if (ipv6_addr_any(token)) 4525 return -EINVAL; 4526 if (dev->flags & (IFF_LOOPBACK | IFF_NOARP)) 4527 return -EINVAL; 4528 if (!ipv6_accept_ra(idev)) 4529 return -EINVAL; 4530 if (idev->cnf.rtr_solicits <= 0) 4531 return -EINVAL; 4532 4533 write_lock_bh(&idev->lock); 4534 4535 BUILD_BUG_ON(sizeof(token->s6_addr) != 16); 4536 memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8); 4537 4538 write_unlock_bh(&idev->lock); 4539 4540 if (!idev->dead && (idev->if_flags & IF_READY) && 4541 !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE | 4542 IFA_F_OPTIMISTIC)) { 4543 4544 /* If we're not ready, then normal ifup will take care 4545 * of this. Otherwise, we need to request our rs here. 4546 */ 4547 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters); 4548 update_rs = true; 4549 } 4550 4551 write_lock_bh(&idev->lock); 4552 4553 if (update_rs) { 4554 idev->if_flags |= IF_RS_SENT; 4555 idev->rs_probes = 1; 4556 addrconf_mod_rs_timer(idev, idev->cnf.rtr_solicit_interval); 4557 } 4558 4559 /* Well, that's kinda nasty ... */ 4560 list_for_each_entry(ifp, &idev->addr_list, if_list) { 4561 spin_lock(&ifp->lock); 4562 if (ifp->tokenized) { 4563 ifp->valid_lft = 0; 4564 ifp->prefered_lft = 0; 4565 } 4566 spin_unlock(&ifp->lock); 4567 } 4568 4569 write_unlock_bh(&idev->lock); 4570 inet6_ifinfo_notify(RTM_NEWLINK, idev); 4571 addrconf_verify_rtnl(); 4572 return 0; 4573 } 4574 4575 static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla) 4576 { 4577 int err = -EINVAL; 4578 struct inet6_dev *idev = __in6_dev_get(dev); 4579 struct nlattr *tb[IFLA_INET6_MAX + 1]; 4580 4581 if (!idev) 4582 return -EAFNOSUPPORT; 4583 4584 if (nla_parse_nested(tb, IFLA_INET6_MAX, nla, NULL) < 0) 4585 BUG(); 4586 4587 if (tb[IFLA_INET6_TOKEN]) { 4588 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN])); 4589 if (err) 4590 return err; 4591 } 4592 4593 if (tb[IFLA_INET6_ADDR_GEN_MODE]) { 4594 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]); 4595 4596 if (mode != IN6_ADDR_GEN_MODE_EUI64 && 4597 mode != IN6_ADDR_GEN_MODE_NONE) 4598 return -EINVAL; 4599 idev->addr_gen_mode = mode; 4600 err = 0; 4601 } 4602 4603 return err; 4604 } 4605 4606 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev, 4607 u32 portid, u32 seq, int event, unsigned int flags) 4608 { 4609 struct net_device *dev = idev->dev; 4610 struct ifinfomsg *hdr; 4611 struct nlmsghdr *nlh; 4612 void *protoinfo; 4613 4614 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags); 4615 if (nlh == NULL) 4616 return -EMSGSIZE; 4617 4618 hdr = nlmsg_data(nlh); 4619 hdr->ifi_family = AF_INET6; 4620 hdr->__ifi_pad = 0; 4621 hdr->ifi_type = dev->type; 4622 hdr->ifi_index = dev->ifindex; 4623 hdr->ifi_flags = dev_get_flags(dev); 4624 hdr->ifi_change = 0; 4625 4626 if (nla_put_string(skb, IFLA_IFNAME, dev->name) || 4627 (dev->addr_len && 4628 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) || 4629 nla_put_u32(skb, IFLA_MTU, dev->mtu) || 4630 (dev->ifindex != dev->iflink && 4631 nla_put_u32(skb, IFLA_LINK, dev->iflink))) 4632 goto nla_put_failure; 4633 protoinfo = nla_nest_start(skb, IFLA_PROTINFO); 4634 if (protoinfo == NULL) 4635 goto nla_put_failure; 4636 4637 if (inet6_fill_ifla6_attrs(skb, idev) < 0) 4638 goto nla_put_failure; 4639 4640 nla_nest_end(skb, protoinfo); 4641 return nlmsg_end(skb, nlh); 4642 4643 nla_put_failure: 4644 nlmsg_cancel(skb, nlh); 4645 return -EMSGSIZE; 4646 } 4647 4648 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb) 4649 { 4650 struct net *net = sock_net(skb->sk); 4651 int h, s_h; 4652 int idx = 0, s_idx; 4653 struct net_device *dev; 4654 struct inet6_dev *idev; 4655 struct hlist_head *head; 4656 4657 s_h = cb->args[0]; 4658 s_idx = cb->args[1]; 4659 4660 rcu_read_lock(); 4661 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 4662 idx = 0; 4663 head = &net->dev_index_head[h]; 4664 hlist_for_each_entry_rcu(dev, head, index_hlist) { 4665 if (idx < s_idx) 4666 goto cont; 4667 idev = __in6_dev_get(dev); 4668 if (!idev) 4669 goto cont; 4670 if (inet6_fill_ifinfo(skb, idev, 4671 NETLINK_CB(cb->skb).portid, 4672 cb->nlh->nlmsg_seq, 4673 RTM_NEWLINK, NLM_F_MULTI) <= 0) 4674 goto out; 4675 cont: 4676 idx++; 4677 } 4678 } 4679 out: 4680 rcu_read_unlock(); 4681 cb->args[1] = idx; 4682 cb->args[0] = h; 4683 4684 return skb->len; 4685 } 4686 4687 void inet6_ifinfo_notify(int event, struct inet6_dev *idev) 4688 { 4689 struct sk_buff *skb; 4690 struct net *net = dev_net(idev->dev); 4691 int err = -ENOBUFS; 4692 4693 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC); 4694 if (skb == NULL) 4695 goto errout; 4696 4697 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0); 4698 if (err < 0) { 4699 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */ 4700 WARN_ON(err == -EMSGSIZE); 4701 kfree_skb(skb); 4702 goto errout; 4703 } 4704 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC); 4705 return; 4706 errout: 4707 if (err < 0) 4708 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err); 4709 } 4710 4711 static inline size_t inet6_prefix_nlmsg_size(void) 4712 { 4713 return NLMSG_ALIGN(sizeof(struct prefixmsg)) 4714 + nla_total_size(sizeof(struct in6_addr)) 4715 + nla_total_size(sizeof(struct prefix_cacheinfo)); 4716 } 4717 4718 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev, 4719 struct prefix_info *pinfo, u32 portid, u32 seq, 4720 int event, unsigned int flags) 4721 { 4722 struct prefixmsg *pmsg; 4723 struct nlmsghdr *nlh; 4724 struct prefix_cacheinfo ci; 4725 4726 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags); 4727 if (nlh == NULL) 4728 return -EMSGSIZE; 4729 4730 pmsg = nlmsg_data(nlh); 4731 pmsg->prefix_family = AF_INET6; 4732 pmsg->prefix_pad1 = 0; 4733 pmsg->prefix_pad2 = 0; 4734 pmsg->prefix_ifindex = idev->dev->ifindex; 4735 pmsg->prefix_len = pinfo->prefix_len; 4736 pmsg->prefix_type = pinfo->type; 4737 pmsg->prefix_pad3 = 0; 4738 pmsg->prefix_flags = 0; 4739 if (pinfo->onlink) 4740 pmsg->prefix_flags |= IF_PREFIX_ONLINK; 4741 if (pinfo->autoconf) 4742 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF; 4743 4744 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix)) 4745 goto nla_put_failure; 4746 ci.preferred_time = ntohl(pinfo->prefered); 4747 ci.valid_time = ntohl(pinfo->valid); 4748 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci)) 4749 goto nla_put_failure; 4750 return nlmsg_end(skb, nlh); 4751 4752 nla_put_failure: 4753 nlmsg_cancel(skb, nlh); 4754 return -EMSGSIZE; 4755 } 4756 4757 static void inet6_prefix_notify(int event, struct inet6_dev *idev, 4758 struct prefix_info *pinfo) 4759 { 4760 struct sk_buff *skb; 4761 struct net *net = dev_net(idev->dev); 4762 int err = -ENOBUFS; 4763 4764 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC); 4765 if (skb == NULL) 4766 goto errout; 4767 4768 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0); 4769 if (err < 0) { 4770 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */ 4771 WARN_ON(err == -EMSGSIZE); 4772 kfree_skb(skb); 4773 goto errout; 4774 } 4775 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC); 4776 return; 4777 errout: 4778 if (err < 0) 4779 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err); 4780 } 4781 4782 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 4783 { 4784 struct net *net = dev_net(ifp->idev->dev); 4785 4786 if (event) 4787 ASSERT_RTNL(); 4788 4789 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp); 4790 4791 switch (event) { 4792 case RTM_NEWADDR: 4793 /* 4794 * If the address was optimistic 4795 * we inserted the route at the start of 4796 * our DAD process, so we don't need 4797 * to do it again 4798 */ 4799 if (!(ifp->rt->rt6i_node)) 4800 ip6_ins_rt(ifp->rt); 4801 if (ifp->idev->cnf.forwarding) 4802 addrconf_join_anycast(ifp); 4803 if (!ipv6_addr_any(&ifp->peer_addr)) 4804 addrconf_prefix_route(&ifp->peer_addr, 128, 4805 ifp->idev->dev, 0, 0); 4806 break; 4807 case RTM_DELADDR: 4808 if (ifp->idev->cnf.forwarding) 4809 addrconf_leave_anycast(ifp); 4810 addrconf_leave_solict(ifp->idev, &ifp->addr); 4811 if (!ipv6_addr_any(&ifp->peer_addr)) { 4812 struct rt6_info *rt; 4813 4814 rt = addrconf_get_prefix_route(&ifp->peer_addr, 128, 4815 ifp->idev->dev, 0, 0); 4816 if (rt && ip6_del_rt(rt)) 4817 dst_free(&rt->dst); 4818 } 4819 dst_hold(&ifp->rt->dst); 4820 4821 if (ip6_del_rt(ifp->rt)) 4822 dst_free(&ifp->rt->dst); 4823 4824 rt_genid_bump_ipv6(net); 4825 break; 4826 } 4827 atomic_inc(&net->ipv6.dev_addr_genid); 4828 } 4829 4830 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 4831 { 4832 rcu_read_lock_bh(); 4833 if (likely(ifp->idev->dead == 0)) 4834 __ipv6_ifa_notify(event, ifp); 4835 rcu_read_unlock_bh(); 4836 } 4837 4838 #ifdef CONFIG_SYSCTL 4839 4840 static 4841 int addrconf_sysctl_forward(struct ctl_table *ctl, int write, 4842 void __user *buffer, size_t *lenp, loff_t *ppos) 4843 { 4844 int *valp = ctl->data; 4845 int val = *valp; 4846 loff_t pos = *ppos; 4847 struct ctl_table lctl; 4848 int ret; 4849 4850 /* 4851 * ctl->data points to idev->cnf.forwarding, we should 4852 * not modify it until we get the rtnl lock. 4853 */ 4854 lctl = *ctl; 4855 lctl.data = &val; 4856 4857 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 4858 4859 if (write) 4860 ret = addrconf_fixup_forwarding(ctl, valp, val); 4861 if (ret) 4862 *ppos = pos; 4863 return ret; 4864 } 4865 4866 static void dev_disable_change(struct inet6_dev *idev) 4867 { 4868 struct netdev_notifier_info info; 4869 4870 if (!idev || !idev->dev) 4871 return; 4872 4873 netdev_notifier_info_init(&info, idev->dev); 4874 if (idev->cnf.disable_ipv6) 4875 addrconf_notify(NULL, NETDEV_DOWN, &info); 4876 else 4877 addrconf_notify(NULL, NETDEV_UP, &info); 4878 } 4879 4880 static void addrconf_disable_change(struct net *net, __s32 newf) 4881 { 4882 struct net_device *dev; 4883 struct inet6_dev *idev; 4884 4885 rcu_read_lock(); 4886 for_each_netdev_rcu(net, dev) { 4887 idev = __in6_dev_get(dev); 4888 if (idev) { 4889 int changed = (!idev->cnf.disable_ipv6) ^ (!newf); 4890 idev->cnf.disable_ipv6 = newf; 4891 if (changed) 4892 dev_disable_change(idev); 4893 } 4894 } 4895 rcu_read_unlock(); 4896 } 4897 4898 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf) 4899 { 4900 struct net *net; 4901 int old; 4902 4903 if (!rtnl_trylock()) 4904 return restart_syscall(); 4905 4906 net = (struct net *)table->extra2; 4907 old = *p; 4908 *p = newf; 4909 4910 if (p == &net->ipv6.devconf_dflt->disable_ipv6) { 4911 rtnl_unlock(); 4912 return 0; 4913 } 4914 4915 if (p == &net->ipv6.devconf_all->disable_ipv6) { 4916 net->ipv6.devconf_dflt->disable_ipv6 = newf; 4917 addrconf_disable_change(net, newf); 4918 } else if ((!newf) ^ (!old)) 4919 dev_disable_change((struct inet6_dev *)table->extra1); 4920 4921 rtnl_unlock(); 4922 return 0; 4923 } 4924 4925 static 4926 int addrconf_sysctl_disable(struct ctl_table *ctl, int write, 4927 void __user *buffer, size_t *lenp, loff_t *ppos) 4928 { 4929 int *valp = ctl->data; 4930 int val = *valp; 4931 loff_t pos = *ppos; 4932 struct ctl_table lctl; 4933 int ret; 4934 4935 /* 4936 * ctl->data points to idev->cnf.disable_ipv6, we should 4937 * not modify it until we get the rtnl lock. 4938 */ 4939 lctl = *ctl; 4940 lctl.data = &val; 4941 4942 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 4943 4944 if (write) 4945 ret = addrconf_disable_ipv6(ctl, valp, val); 4946 if (ret) 4947 *ppos = pos; 4948 return ret; 4949 } 4950 4951 static 4952 int addrconf_sysctl_proxy_ndp(struct ctl_table *ctl, int write, 4953 void __user *buffer, size_t *lenp, loff_t *ppos) 4954 { 4955 int *valp = ctl->data; 4956 int ret; 4957 int old, new; 4958 4959 old = *valp; 4960 ret = proc_dointvec(ctl, write, buffer, lenp, ppos); 4961 new = *valp; 4962 4963 if (write && old != new) { 4964 struct net *net = ctl->extra2; 4965 4966 if (!rtnl_trylock()) 4967 return restart_syscall(); 4968 4969 if (valp == &net->ipv6.devconf_dflt->proxy_ndp) 4970 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH, 4971 NETCONFA_IFINDEX_DEFAULT, 4972 net->ipv6.devconf_dflt); 4973 else if (valp == &net->ipv6.devconf_all->proxy_ndp) 4974 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH, 4975 NETCONFA_IFINDEX_ALL, 4976 net->ipv6.devconf_all); 4977 else { 4978 struct inet6_dev *idev = ctl->extra1; 4979 4980 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH, 4981 idev->dev->ifindex, 4982 &idev->cnf); 4983 } 4984 rtnl_unlock(); 4985 } 4986 4987 return ret; 4988 } 4989 4990 4991 static struct addrconf_sysctl_table 4992 { 4993 struct ctl_table_header *sysctl_header; 4994 struct ctl_table addrconf_vars[DEVCONF_MAX+1]; 4995 } addrconf_sysctl __read_mostly = { 4996 .sysctl_header = NULL, 4997 .addrconf_vars = { 4998 { 4999 .procname = "forwarding", 5000 .data = &ipv6_devconf.forwarding, 5001 .maxlen = sizeof(int), 5002 .mode = 0644, 5003 .proc_handler = addrconf_sysctl_forward, 5004 }, 5005 { 5006 .procname = "hop_limit", 5007 .data = &ipv6_devconf.hop_limit, 5008 .maxlen = sizeof(int), 5009 .mode = 0644, 5010 .proc_handler = proc_dointvec, 5011 }, 5012 { 5013 .procname = "mtu", 5014 .data = &ipv6_devconf.mtu6, 5015 .maxlen = sizeof(int), 5016 .mode = 0644, 5017 .proc_handler = proc_dointvec, 5018 }, 5019 { 5020 .procname = "accept_ra", 5021 .data = &ipv6_devconf.accept_ra, 5022 .maxlen = sizeof(int), 5023 .mode = 0644, 5024 .proc_handler = proc_dointvec, 5025 }, 5026 { 5027 .procname = "accept_redirects", 5028 .data = &ipv6_devconf.accept_redirects, 5029 .maxlen = sizeof(int), 5030 .mode = 0644, 5031 .proc_handler = proc_dointvec, 5032 }, 5033 { 5034 .procname = "autoconf", 5035 .data = &ipv6_devconf.autoconf, 5036 .maxlen = sizeof(int), 5037 .mode = 0644, 5038 .proc_handler = proc_dointvec, 5039 }, 5040 { 5041 .procname = "dad_transmits", 5042 .data = &ipv6_devconf.dad_transmits, 5043 .maxlen = sizeof(int), 5044 .mode = 0644, 5045 .proc_handler = proc_dointvec, 5046 }, 5047 { 5048 .procname = "router_solicitations", 5049 .data = &ipv6_devconf.rtr_solicits, 5050 .maxlen = sizeof(int), 5051 .mode = 0644, 5052 .proc_handler = proc_dointvec, 5053 }, 5054 { 5055 .procname = "router_solicitation_interval", 5056 .data = &ipv6_devconf.rtr_solicit_interval, 5057 .maxlen = sizeof(int), 5058 .mode = 0644, 5059 .proc_handler = proc_dointvec_jiffies, 5060 }, 5061 { 5062 .procname = "router_solicitation_delay", 5063 .data = &ipv6_devconf.rtr_solicit_delay, 5064 .maxlen = sizeof(int), 5065 .mode = 0644, 5066 .proc_handler = proc_dointvec_jiffies, 5067 }, 5068 { 5069 .procname = "force_mld_version", 5070 .data = &ipv6_devconf.force_mld_version, 5071 .maxlen = sizeof(int), 5072 .mode = 0644, 5073 .proc_handler = proc_dointvec, 5074 }, 5075 { 5076 .procname = "mldv1_unsolicited_report_interval", 5077 .data = 5078 &ipv6_devconf.mldv1_unsolicited_report_interval, 5079 .maxlen = sizeof(int), 5080 .mode = 0644, 5081 .proc_handler = proc_dointvec_ms_jiffies, 5082 }, 5083 { 5084 .procname = "mldv2_unsolicited_report_interval", 5085 .data = 5086 &ipv6_devconf.mldv2_unsolicited_report_interval, 5087 .maxlen = sizeof(int), 5088 .mode = 0644, 5089 .proc_handler = proc_dointvec_ms_jiffies, 5090 }, 5091 { 5092 .procname = "use_tempaddr", 5093 .data = &ipv6_devconf.use_tempaddr, 5094 .maxlen = sizeof(int), 5095 .mode = 0644, 5096 .proc_handler = proc_dointvec, 5097 }, 5098 { 5099 .procname = "temp_valid_lft", 5100 .data = &ipv6_devconf.temp_valid_lft, 5101 .maxlen = sizeof(int), 5102 .mode = 0644, 5103 .proc_handler = proc_dointvec, 5104 }, 5105 { 5106 .procname = "temp_prefered_lft", 5107 .data = &ipv6_devconf.temp_prefered_lft, 5108 .maxlen = sizeof(int), 5109 .mode = 0644, 5110 .proc_handler = proc_dointvec, 5111 }, 5112 { 5113 .procname = "regen_max_retry", 5114 .data = &ipv6_devconf.regen_max_retry, 5115 .maxlen = sizeof(int), 5116 .mode = 0644, 5117 .proc_handler = proc_dointvec, 5118 }, 5119 { 5120 .procname = "max_desync_factor", 5121 .data = &ipv6_devconf.max_desync_factor, 5122 .maxlen = sizeof(int), 5123 .mode = 0644, 5124 .proc_handler = proc_dointvec, 5125 }, 5126 { 5127 .procname = "max_addresses", 5128 .data = &ipv6_devconf.max_addresses, 5129 .maxlen = sizeof(int), 5130 .mode = 0644, 5131 .proc_handler = proc_dointvec, 5132 }, 5133 { 5134 .procname = "accept_ra_defrtr", 5135 .data = &ipv6_devconf.accept_ra_defrtr, 5136 .maxlen = sizeof(int), 5137 .mode = 0644, 5138 .proc_handler = proc_dointvec, 5139 }, 5140 { 5141 .procname = "accept_ra_pinfo", 5142 .data = &ipv6_devconf.accept_ra_pinfo, 5143 .maxlen = sizeof(int), 5144 .mode = 0644, 5145 .proc_handler = proc_dointvec, 5146 }, 5147 #ifdef CONFIG_IPV6_ROUTER_PREF 5148 { 5149 .procname = "accept_ra_rtr_pref", 5150 .data = &ipv6_devconf.accept_ra_rtr_pref, 5151 .maxlen = sizeof(int), 5152 .mode = 0644, 5153 .proc_handler = proc_dointvec, 5154 }, 5155 { 5156 .procname = "router_probe_interval", 5157 .data = &ipv6_devconf.rtr_probe_interval, 5158 .maxlen = sizeof(int), 5159 .mode = 0644, 5160 .proc_handler = proc_dointvec_jiffies, 5161 }, 5162 #ifdef CONFIG_IPV6_ROUTE_INFO 5163 { 5164 .procname = "accept_ra_rt_info_max_plen", 5165 .data = &ipv6_devconf.accept_ra_rt_info_max_plen, 5166 .maxlen = sizeof(int), 5167 .mode = 0644, 5168 .proc_handler = proc_dointvec, 5169 }, 5170 #endif 5171 #endif 5172 { 5173 .procname = "proxy_ndp", 5174 .data = &ipv6_devconf.proxy_ndp, 5175 .maxlen = sizeof(int), 5176 .mode = 0644, 5177 .proc_handler = addrconf_sysctl_proxy_ndp, 5178 }, 5179 { 5180 .procname = "accept_source_route", 5181 .data = &ipv6_devconf.accept_source_route, 5182 .maxlen = sizeof(int), 5183 .mode = 0644, 5184 .proc_handler = proc_dointvec, 5185 }, 5186 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 5187 { 5188 .procname = "optimistic_dad", 5189 .data = &ipv6_devconf.optimistic_dad, 5190 .maxlen = sizeof(int), 5191 .mode = 0644, 5192 .proc_handler = proc_dointvec, 5193 5194 }, 5195 { 5196 .procname = "use_optimistic", 5197 .data = &ipv6_devconf.use_optimistic, 5198 .maxlen = sizeof(int), 5199 .mode = 0644, 5200 .proc_handler = proc_dointvec, 5201 5202 }, 5203 #endif 5204 #ifdef CONFIG_IPV6_MROUTE 5205 { 5206 .procname = "mc_forwarding", 5207 .data = &ipv6_devconf.mc_forwarding, 5208 .maxlen = sizeof(int), 5209 .mode = 0444, 5210 .proc_handler = proc_dointvec, 5211 }, 5212 #endif 5213 { 5214 .procname = "disable_ipv6", 5215 .data = &ipv6_devconf.disable_ipv6, 5216 .maxlen = sizeof(int), 5217 .mode = 0644, 5218 .proc_handler = addrconf_sysctl_disable, 5219 }, 5220 { 5221 .procname = "accept_dad", 5222 .data = &ipv6_devconf.accept_dad, 5223 .maxlen = sizeof(int), 5224 .mode = 0644, 5225 .proc_handler = proc_dointvec, 5226 }, 5227 { 5228 .procname = "force_tllao", 5229 .data = &ipv6_devconf.force_tllao, 5230 .maxlen = sizeof(int), 5231 .mode = 0644, 5232 .proc_handler = proc_dointvec 5233 }, 5234 { 5235 .procname = "ndisc_notify", 5236 .data = &ipv6_devconf.ndisc_notify, 5237 .maxlen = sizeof(int), 5238 .mode = 0644, 5239 .proc_handler = proc_dointvec 5240 }, 5241 { 5242 .procname = "suppress_frag_ndisc", 5243 .data = &ipv6_devconf.suppress_frag_ndisc, 5244 .maxlen = sizeof(int), 5245 .mode = 0644, 5246 .proc_handler = proc_dointvec 5247 }, 5248 { 5249 .procname = "accept_ra_from_local", 5250 .data = &ipv6_devconf.accept_ra_from_local, 5251 .maxlen = sizeof(int), 5252 .mode = 0644, 5253 .proc_handler = proc_dointvec, 5254 }, 5255 { 5256 /* sentinel */ 5257 } 5258 }, 5259 }; 5260 5261 static int __addrconf_sysctl_register(struct net *net, char *dev_name, 5262 struct inet6_dev *idev, struct ipv6_devconf *p) 5263 { 5264 int i; 5265 struct addrconf_sysctl_table *t; 5266 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ]; 5267 5268 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL); 5269 if (t == NULL) 5270 goto out; 5271 5272 for (i = 0; t->addrconf_vars[i].data; i++) { 5273 t->addrconf_vars[i].data += (char *)p - (char *)&ipv6_devconf; 5274 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */ 5275 t->addrconf_vars[i].extra2 = net; 5276 } 5277 5278 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name); 5279 5280 t->sysctl_header = register_net_sysctl(net, path, t->addrconf_vars); 5281 if (t->sysctl_header == NULL) 5282 goto free; 5283 5284 p->sysctl = t; 5285 return 0; 5286 5287 free: 5288 kfree(t); 5289 out: 5290 return -ENOBUFS; 5291 } 5292 5293 static void __addrconf_sysctl_unregister(struct ipv6_devconf *p) 5294 { 5295 struct addrconf_sysctl_table *t; 5296 5297 if (p->sysctl == NULL) 5298 return; 5299 5300 t = p->sysctl; 5301 p->sysctl = NULL; 5302 unregister_net_sysctl_table(t->sysctl_header); 5303 kfree(t); 5304 } 5305 5306 static int addrconf_sysctl_register(struct inet6_dev *idev) 5307 { 5308 int err; 5309 5310 if (!sysctl_dev_name_is_allowed(idev->dev->name)) 5311 return -EINVAL; 5312 5313 err = neigh_sysctl_register(idev->dev, idev->nd_parms, 5314 &ndisc_ifinfo_sysctl_change); 5315 if (err) 5316 return err; 5317 err = __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name, 5318 idev, &idev->cnf); 5319 if (err) 5320 neigh_sysctl_unregister(idev->nd_parms); 5321 5322 return err; 5323 } 5324 5325 static void addrconf_sysctl_unregister(struct inet6_dev *idev) 5326 { 5327 __addrconf_sysctl_unregister(&idev->cnf); 5328 neigh_sysctl_unregister(idev->nd_parms); 5329 } 5330 5331 5332 #endif 5333 5334 static int __net_init addrconf_init_net(struct net *net) 5335 { 5336 int err = -ENOMEM; 5337 struct ipv6_devconf *all, *dflt; 5338 5339 all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL); 5340 if (all == NULL) 5341 goto err_alloc_all; 5342 5343 dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL); 5344 if (dflt == NULL) 5345 goto err_alloc_dflt; 5346 5347 /* these will be inherited by all namespaces */ 5348 dflt->autoconf = ipv6_defaults.autoconf; 5349 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6; 5350 5351 net->ipv6.devconf_all = all; 5352 net->ipv6.devconf_dflt = dflt; 5353 5354 #ifdef CONFIG_SYSCTL 5355 err = __addrconf_sysctl_register(net, "all", NULL, all); 5356 if (err < 0) 5357 goto err_reg_all; 5358 5359 err = __addrconf_sysctl_register(net, "default", NULL, dflt); 5360 if (err < 0) 5361 goto err_reg_dflt; 5362 #endif 5363 return 0; 5364 5365 #ifdef CONFIG_SYSCTL 5366 err_reg_dflt: 5367 __addrconf_sysctl_unregister(all); 5368 err_reg_all: 5369 kfree(dflt); 5370 #endif 5371 err_alloc_dflt: 5372 kfree(all); 5373 err_alloc_all: 5374 return err; 5375 } 5376 5377 static void __net_exit addrconf_exit_net(struct net *net) 5378 { 5379 #ifdef CONFIG_SYSCTL 5380 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt); 5381 __addrconf_sysctl_unregister(net->ipv6.devconf_all); 5382 #endif 5383 kfree(net->ipv6.devconf_dflt); 5384 kfree(net->ipv6.devconf_all); 5385 } 5386 5387 static struct pernet_operations addrconf_ops = { 5388 .init = addrconf_init_net, 5389 .exit = addrconf_exit_net, 5390 }; 5391 5392 static struct rtnl_af_ops inet6_ops = { 5393 .family = AF_INET6, 5394 .fill_link_af = inet6_fill_link_af, 5395 .get_link_af_size = inet6_get_link_af_size, 5396 .set_link_af = inet6_set_link_af, 5397 }; 5398 5399 /* 5400 * Init / cleanup code 5401 */ 5402 5403 int __init addrconf_init(void) 5404 { 5405 struct inet6_dev *idev; 5406 int i, err; 5407 5408 err = ipv6_addr_label_init(); 5409 if (err < 0) { 5410 pr_crit("%s: cannot initialize default policy table: %d\n", 5411 __func__, err); 5412 goto out; 5413 } 5414 5415 err = register_pernet_subsys(&addrconf_ops); 5416 if (err < 0) 5417 goto out_addrlabel; 5418 5419 addrconf_wq = create_workqueue("ipv6_addrconf"); 5420 if (!addrconf_wq) { 5421 err = -ENOMEM; 5422 goto out_nowq; 5423 } 5424 5425 /* The addrconf netdev notifier requires that loopback_dev 5426 * has it's ipv6 private information allocated and setup 5427 * before it can bring up and give link-local addresses 5428 * to other devices which are up. 5429 * 5430 * Unfortunately, loopback_dev is not necessarily the first 5431 * entry in the global dev_base list of net devices. In fact, 5432 * it is likely to be the very last entry on that list. 5433 * So this causes the notifier registry below to try and 5434 * give link-local addresses to all devices besides loopback_dev 5435 * first, then loopback_dev, which cases all the non-loopback_dev 5436 * devices to fail to get a link-local address. 5437 * 5438 * So, as a temporary fix, allocate the ipv6 structure for 5439 * loopback_dev first by hand. 5440 * Longer term, all of the dependencies ipv6 has upon the loopback 5441 * device and it being up should be removed. 5442 */ 5443 rtnl_lock(); 5444 idev = ipv6_add_dev(init_net.loopback_dev); 5445 rtnl_unlock(); 5446 if (IS_ERR(idev)) { 5447 err = PTR_ERR(idev); 5448 goto errlo; 5449 } 5450 5451 for (i = 0; i < IN6_ADDR_HSIZE; i++) 5452 INIT_HLIST_HEAD(&inet6_addr_lst[i]); 5453 5454 register_netdevice_notifier(&ipv6_dev_notf); 5455 5456 addrconf_verify(); 5457 5458 rtnl_af_register(&inet6_ops); 5459 5460 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo, 5461 NULL); 5462 if (err < 0) 5463 goto errout; 5464 5465 /* Only the first call to __rtnl_register can fail */ 5466 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL, NULL); 5467 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL, NULL); 5468 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr, 5469 inet6_dump_ifaddr, NULL); 5470 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL, 5471 inet6_dump_ifmcaddr, NULL); 5472 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL, 5473 inet6_dump_ifacaddr, NULL); 5474 __rtnl_register(PF_INET6, RTM_GETNETCONF, inet6_netconf_get_devconf, 5475 inet6_netconf_dump_devconf, NULL); 5476 5477 ipv6_addr_label_rtnl_register(); 5478 5479 return 0; 5480 errout: 5481 rtnl_af_unregister(&inet6_ops); 5482 unregister_netdevice_notifier(&ipv6_dev_notf); 5483 errlo: 5484 destroy_workqueue(addrconf_wq); 5485 out_nowq: 5486 unregister_pernet_subsys(&addrconf_ops); 5487 out_addrlabel: 5488 ipv6_addr_label_cleanup(); 5489 out: 5490 return err; 5491 } 5492 5493 void addrconf_cleanup(void) 5494 { 5495 struct net_device *dev; 5496 int i; 5497 5498 unregister_netdevice_notifier(&ipv6_dev_notf); 5499 unregister_pernet_subsys(&addrconf_ops); 5500 ipv6_addr_label_cleanup(); 5501 5502 rtnl_lock(); 5503 5504 __rtnl_af_unregister(&inet6_ops); 5505 5506 /* clean dev list */ 5507 for_each_netdev(&init_net, dev) { 5508 if (__in6_dev_get(dev) == NULL) 5509 continue; 5510 addrconf_ifdown(dev, 1); 5511 } 5512 addrconf_ifdown(init_net.loopback_dev, 2); 5513 5514 /* 5515 * Check hash table. 5516 */ 5517 spin_lock_bh(&addrconf_hash_lock); 5518 for (i = 0; i < IN6_ADDR_HSIZE; i++) 5519 WARN_ON(!hlist_empty(&inet6_addr_lst[i])); 5520 spin_unlock_bh(&addrconf_hash_lock); 5521 cancel_delayed_work(&addr_chk_work); 5522 rtnl_unlock(); 5523 5524 destroy_workqueue(addrconf_wq); 5525 } 5526