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/inet.h> 50 #include <linux/in6.h> 51 #include <linux/netdevice.h> 52 #include <linux/if_addr.h> 53 #include <linux/if_arp.h> 54 #include <linux/if_arcnet.h> 55 #include <linux/if_infiniband.h> 56 #include <linux/route.h> 57 #include <linux/inetdevice.h> 58 #include <linux/init.h> 59 #include <linux/slab.h> 60 #ifdef CONFIG_SYSCTL 61 #include <linux/sysctl.h> 62 #endif 63 #include <linux/capability.h> 64 #include <linux/delay.h> 65 #include <linux/notifier.h> 66 #include <linux/string.h> 67 #include <linux/hash.h> 68 69 #include <net/net_namespace.h> 70 #include <net/sock.h> 71 #include <net/snmp.h> 72 73 #include <net/6lowpan.h> 74 #include <net/firewire.h> 75 #include <net/ipv6.h> 76 #include <net/protocol.h> 77 #include <net/ndisc.h> 78 #include <net/ip6_route.h> 79 #include <net/addrconf.h> 80 #include <net/tcp.h> 81 #include <net/ip.h> 82 #include <net/netlink.h> 83 #include <net/pkt_sched.h> 84 #include <net/l3mdev.h> 85 #include <linux/if_tunnel.h> 86 #include <linux/rtnetlink.h> 87 #include <linux/netconf.h> 88 #include <linux/random.h> 89 #include <linux/uaccess.h> 90 #include <asm/unaligned.h> 91 92 #include <linux/proc_fs.h> 93 #include <linux/seq_file.h> 94 #include <linux/export.h> 95 96 /* Set to 3 to get tracing... */ 97 #define ACONF_DEBUG 2 98 99 #if ACONF_DEBUG >= 3 100 #define ADBG(fmt, ...) printk(fmt, ##__VA_ARGS__) 101 #else 102 #define ADBG(fmt, ...) do { if (0) printk(fmt, ##__VA_ARGS__); } while (0) 103 #endif 104 105 #define INFINITY_LIFE_TIME 0xFFFFFFFF 106 107 #define IPV6_MAX_STRLEN \ 108 sizeof("ffff:ffff:ffff:ffff:ffff:ffff:255.255.255.255") 109 110 static inline u32 cstamp_delta(unsigned long cstamp) 111 { 112 return (cstamp - INITIAL_JIFFIES) * 100UL / HZ; 113 } 114 115 static inline s32 rfc3315_s14_backoff_init(s32 irt) 116 { 117 /* multiply 'initial retransmission time' by 0.9 .. 1.1 */ 118 u64 tmp = (900000 + prandom_u32() % 200001) * (u64)irt; 119 do_div(tmp, 1000000); 120 return (s32)tmp; 121 } 122 123 static inline s32 rfc3315_s14_backoff_update(s32 rt, s32 mrt) 124 { 125 /* multiply 'retransmission timeout' by 1.9 .. 2.1 */ 126 u64 tmp = (1900000 + prandom_u32() % 200001) * (u64)rt; 127 do_div(tmp, 1000000); 128 if ((s32)tmp > mrt) { 129 /* multiply 'maximum retransmission time' by 0.9 .. 1.1 */ 130 tmp = (900000 + prandom_u32() % 200001) * (u64)mrt; 131 do_div(tmp, 1000000); 132 } 133 return (s32)tmp; 134 } 135 136 #ifdef CONFIG_SYSCTL 137 static int addrconf_sysctl_register(struct inet6_dev *idev); 138 static void addrconf_sysctl_unregister(struct inet6_dev *idev); 139 #else 140 static inline int addrconf_sysctl_register(struct inet6_dev *idev) 141 { 142 return 0; 143 } 144 145 static inline void addrconf_sysctl_unregister(struct inet6_dev *idev) 146 { 147 } 148 #endif 149 150 static void ipv6_regen_rndid(struct inet6_dev *idev); 151 static void ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr); 152 153 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev); 154 static int ipv6_count_addresses(struct inet6_dev *idev); 155 static int ipv6_generate_stable_address(struct in6_addr *addr, 156 u8 dad_count, 157 const struct inet6_dev *idev); 158 159 /* 160 * Configured unicast address hash table 161 */ 162 static struct hlist_head inet6_addr_lst[IN6_ADDR_HSIZE]; 163 static DEFINE_SPINLOCK(addrconf_hash_lock); 164 165 static void addrconf_verify(void); 166 static void addrconf_verify_rtnl(void); 167 static void addrconf_verify_work(struct work_struct *); 168 169 static struct workqueue_struct *addrconf_wq; 170 static DECLARE_DELAYED_WORK(addr_chk_work, addrconf_verify_work); 171 172 static void addrconf_join_anycast(struct inet6_ifaddr *ifp); 173 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp); 174 175 static void addrconf_type_change(struct net_device *dev, 176 unsigned long event); 177 static int addrconf_ifdown(struct net_device *dev, int how); 178 179 static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx, 180 int plen, 181 const struct net_device *dev, 182 u32 flags, u32 noflags); 183 184 static void addrconf_dad_start(struct inet6_ifaddr *ifp); 185 static void addrconf_dad_work(struct work_struct *w); 186 static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id); 187 static void addrconf_dad_run(struct inet6_dev *idev); 188 static void addrconf_rs_timer(unsigned long data); 189 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa); 190 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa); 191 192 static void inet6_prefix_notify(int event, struct inet6_dev *idev, 193 struct prefix_info *pinfo); 194 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr, 195 struct net_device *dev); 196 197 static struct ipv6_devconf ipv6_devconf __read_mostly = { 198 .forwarding = 0, 199 .hop_limit = IPV6_DEFAULT_HOPLIMIT, 200 .mtu6 = IPV6_MIN_MTU, 201 .accept_ra = 1, 202 .accept_redirects = 1, 203 .autoconf = 1, 204 .force_mld_version = 0, 205 .mldv1_unsolicited_report_interval = 10 * HZ, 206 .mldv2_unsolicited_report_interval = HZ, 207 .dad_transmits = 1, 208 .rtr_solicits = MAX_RTR_SOLICITATIONS, 209 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL, 210 .rtr_solicit_max_interval = RTR_SOLICITATION_MAX_INTERVAL, 211 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY, 212 .use_tempaddr = 0, 213 .temp_valid_lft = TEMP_VALID_LIFETIME, 214 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME, 215 .regen_max_retry = REGEN_MAX_RETRY, 216 .max_desync_factor = MAX_DESYNC_FACTOR, 217 .max_addresses = IPV6_MAX_ADDRESSES, 218 .accept_ra_defrtr = 1, 219 .accept_ra_from_local = 0, 220 .accept_ra_min_hop_limit= 1, 221 .accept_ra_pinfo = 1, 222 #ifdef CONFIG_IPV6_ROUTER_PREF 223 .accept_ra_rtr_pref = 1, 224 .rtr_probe_interval = 60 * HZ, 225 #ifdef CONFIG_IPV6_ROUTE_INFO 226 .accept_ra_rt_info_max_plen = 0, 227 #endif 228 #endif 229 .proxy_ndp = 0, 230 .accept_source_route = 0, /* we do not accept RH0 by default. */ 231 .disable_ipv6 = 0, 232 .accept_dad = 1, 233 .suppress_frag_ndisc = 1, 234 .accept_ra_mtu = 1, 235 .stable_secret = { 236 .initialized = false, 237 }, 238 .use_oif_addrs_only = 0, 239 .ignore_routes_with_linkdown = 0, 240 .keep_addr_on_down = 0, 241 .seg6_enabled = 0, 242 #ifdef CONFIG_IPV6_SEG6_HMAC 243 .seg6_require_hmac = 0, 244 #endif 245 .enhanced_dad = 1, 246 }; 247 248 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = { 249 .forwarding = 0, 250 .hop_limit = IPV6_DEFAULT_HOPLIMIT, 251 .mtu6 = IPV6_MIN_MTU, 252 .accept_ra = 1, 253 .accept_redirects = 1, 254 .autoconf = 1, 255 .force_mld_version = 0, 256 .mldv1_unsolicited_report_interval = 10 * HZ, 257 .mldv2_unsolicited_report_interval = HZ, 258 .dad_transmits = 1, 259 .rtr_solicits = MAX_RTR_SOLICITATIONS, 260 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL, 261 .rtr_solicit_max_interval = RTR_SOLICITATION_MAX_INTERVAL, 262 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY, 263 .use_tempaddr = 0, 264 .temp_valid_lft = TEMP_VALID_LIFETIME, 265 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME, 266 .regen_max_retry = REGEN_MAX_RETRY, 267 .max_desync_factor = MAX_DESYNC_FACTOR, 268 .max_addresses = IPV6_MAX_ADDRESSES, 269 .accept_ra_defrtr = 1, 270 .accept_ra_from_local = 0, 271 .accept_ra_min_hop_limit= 1, 272 .accept_ra_pinfo = 1, 273 #ifdef CONFIG_IPV6_ROUTER_PREF 274 .accept_ra_rtr_pref = 1, 275 .rtr_probe_interval = 60 * HZ, 276 #ifdef CONFIG_IPV6_ROUTE_INFO 277 .accept_ra_rt_info_max_plen = 0, 278 #endif 279 #endif 280 .proxy_ndp = 0, 281 .accept_source_route = 0, /* we do not accept RH0 by default. */ 282 .disable_ipv6 = 0, 283 .accept_dad = 1, 284 .suppress_frag_ndisc = 1, 285 .accept_ra_mtu = 1, 286 .stable_secret = { 287 .initialized = false, 288 }, 289 .use_oif_addrs_only = 0, 290 .ignore_routes_with_linkdown = 0, 291 .keep_addr_on_down = 0, 292 .seg6_enabled = 0, 293 #ifdef CONFIG_IPV6_SEG6_HMAC 294 .seg6_require_hmac = 0, 295 #endif 296 .enhanced_dad = 1, 297 }; 298 299 /* Check if a valid qdisc is available */ 300 static inline bool addrconf_qdisc_ok(const struct net_device *dev) 301 { 302 return !qdisc_tx_is_noop(dev); 303 } 304 305 static void addrconf_del_rs_timer(struct inet6_dev *idev) 306 { 307 if (del_timer(&idev->rs_timer)) 308 __in6_dev_put(idev); 309 } 310 311 static void addrconf_del_dad_work(struct inet6_ifaddr *ifp) 312 { 313 if (cancel_delayed_work(&ifp->dad_work)) 314 __in6_ifa_put(ifp); 315 } 316 317 static void addrconf_mod_rs_timer(struct inet6_dev *idev, 318 unsigned long when) 319 { 320 if (!timer_pending(&idev->rs_timer)) 321 in6_dev_hold(idev); 322 mod_timer(&idev->rs_timer, jiffies + when); 323 } 324 325 static void addrconf_mod_dad_work(struct inet6_ifaddr *ifp, 326 unsigned long delay) 327 { 328 if (!delayed_work_pending(&ifp->dad_work)) 329 in6_ifa_hold(ifp); 330 mod_delayed_work(addrconf_wq, &ifp->dad_work, delay); 331 } 332 333 static int snmp6_alloc_dev(struct inet6_dev *idev) 334 { 335 int i; 336 337 idev->stats.ipv6 = alloc_percpu(struct ipstats_mib); 338 if (!idev->stats.ipv6) 339 goto err_ip; 340 341 for_each_possible_cpu(i) { 342 struct ipstats_mib *addrconf_stats; 343 addrconf_stats = per_cpu_ptr(idev->stats.ipv6, i); 344 u64_stats_init(&addrconf_stats->syncp); 345 } 346 347 348 idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device), 349 GFP_KERNEL); 350 if (!idev->stats.icmpv6dev) 351 goto err_icmp; 352 idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device), 353 GFP_KERNEL); 354 if (!idev->stats.icmpv6msgdev) 355 goto err_icmpmsg; 356 357 return 0; 358 359 err_icmpmsg: 360 kfree(idev->stats.icmpv6dev); 361 err_icmp: 362 free_percpu(idev->stats.ipv6); 363 err_ip: 364 return -ENOMEM; 365 } 366 367 static struct inet6_dev *ipv6_add_dev(struct net_device *dev) 368 { 369 struct inet6_dev *ndev; 370 int err = -ENOMEM; 371 372 ASSERT_RTNL(); 373 374 if (dev->mtu < IPV6_MIN_MTU) 375 return ERR_PTR(-EINVAL); 376 377 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL); 378 if (!ndev) 379 return ERR_PTR(err); 380 381 rwlock_init(&ndev->lock); 382 ndev->dev = dev; 383 INIT_LIST_HEAD(&ndev->addr_list); 384 setup_timer(&ndev->rs_timer, addrconf_rs_timer, 385 (unsigned long)ndev); 386 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf)); 387 388 if (ndev->cnf.stable_secret.initialized) 389 ndev->addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY; 390 else 391 ndev->addr_gen_mode = IN6_ADDR_GEN_MODE_EUI64; 392 393 ndev->cnf.mtu6 = dev->mtu; 394 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl); 395 if (!ndev->nd_parms) { 396 kfree(ndev); 397 return ERR_PTR(err); 398 } 399 if (ndev->cnf.forwarding) 400 dev_disable_lro(dev); 401 /* We refer to the device */ 402 dev_hold(dev); 403 404 if (snmp6_alloc_dev(ndev) < 0) { 405 ADBG(KERN_WARNING 406 "%s: cannot allocate memory for statistics; dev=%s.\n", 407 __func__, dev->name); 408 neigh_parms_release(&nd_tbl, ndev->nd_parms); 409 dev_put(dev); 410 kfree(ndev); 411 return ERR_PTR(err); 412 } 413 414 if (snmp6_register_dev(ndev) < 0) { 415 ADBG(KERN_WARNING 416 "%s: cannot create /proc/net/dev_snmp6/%s\n", 417 __func__, dev->name); 418 goto err_release; 419 } 420 421 /* One reference from device. */ 422 in6_dev_hold(ndev); 423 424 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK)) 425 ndev->cnf.accept_dad = -1; 426 427 #if IS_ENABLED(CONFIG_IPV6_SIT) 428 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) { 429 pr_info("%s: Disabled Multicast RS\n", dev->name); 430 ndev->cnf.rtr_solicits = 0; 431 } 432 #endif 433 434 INIT_LIST_HEAD(&ndev->tempaddr_list); 435 ndev->desync_factor = U32_MAX; 436 if ((dev->flags&IFF_LOOPBACK) || 437 dev->type == ARPHRD_TUNNEL || 438 dev->type == ARPHRD_TUNNEL6 || 439 dev->type == ARPHRD_SIT || 440 dev->type == ARPHRD_NONE) { 441 ndev->cnf.use_tempaddr = -1; 442 } else 443 ipv6_regen_rndid(ndev); 444 445 ndev->token = in6addr_any; 446 447 if (netif_running(dev) && addrconf_qdisc_ok(dev)) 448 ndev->if_flags |= IF_READY; 449 450 ipv6_mc_init_dev(ndev); 451 ndev->tstamp = jiffies; 452 err = addrconf_sysctl_register(ndev); 453 if (err) { 454 ipv6_mc_destroy_dev(ndev); 455 snmp6_unregister_dev(ndev); 456 goto err_release; 457 } 458 /* protected by rtnl_lock */ 459 rcu_assign_pointer(dev->ip6_ptr, ndev); 460 461 /* Join interface-local all-node multicast group */ 462 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allnodes); 463 464 /* Join all-node multicast group */ 465 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes); 466 467 /* Join all-router multicast group if forwarding is set */ 468 if (ndev->cnf.forwarding && (dev->flags & IFF_MULTICAST)) 469 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters); 470 471 return ndev; 472 473 err_release: 474 neigh_parms_release(&nd_tbl, ndev->nd_parms); 475 ndev->dead = 1; 476 in6_dev_finish_destroy(ndev); 477 return ERR_PTR(err); 478 } 479 480 static struct inet6_dev *ipv6_find_idev(struct net_device *dev) 481 { 482 struct inet6_dev *idev; 483 484 ASSERT_RTNL(); 485 486 idev = __in6_dev_get(dev); 487 if (!idev) { 488 idev = ipv6_add_dev(dev); 489 if (IS_ERR(idev)) 490 return NULL; 491 } 492 493 if (dev->flags&IFF_UP) 494 ipv6_mc_up(idev); 495 return idev; 496 } 497 498 static int inet6_netconf_msgsize_devconf(int type) 499 { 500 int size = NLMSG_ALIGN(sizeof(struct netconfmsg)) 501 + nla_total_size(4); /* NETCONFA_IFINDEX */ 502 bool all = false; 503 504 if (type == NETCONFA_ALL) 505 all = true; 506 507 if (all || type == NETCONFA_FORWARDING) 508 size += nla_total_size(4); 509 #ifdef CONFIG_IPV6_MROUTE 510 if (all || type == NETCONFA_MC_FORWARDING) 511 size += nla_total_size(4); 512 #endif 513 if (all || type == NETCONFA_PROXY_NEIGH) 514 size += nla_total_size(4); 515 516 if (all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN) 517 size += nla_total_size(4); 518 519 return size; 520 } 521 522 static int inet6_netconf_fill_devconf(struct sk_buff *skb, int ifindex, 523 struct ipv6_devconf *devconf, u32 portid, 524 u32 seq, int event, unsigned int flags, 525 int type) 526 { 527 struct nlmsghdr *nlh; 528 struct netconfmsg *ncm; 529 bool all = false; 530 531 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg), 532 flags); 533 if (!nlh) 534 return -EMSGSIZE; 535 536 if (type == NETCONFA_ALL) 537 all = true; 538 539 ncm = nlmsg_data(nlh); 540 ncm->ncm_family = AF_INET6; 541 542 if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0) 543 goto nla_put_failure; 544 545 if ((all || type == NETCONFA_FORWARDING) && 546 nla_put_s32(skb, NETCONFA_FORWARDING, devconf->forwarding) < 0) 547 goto nla_put_failure; 548 #ifdef CONFIG_IPV6_MROUTE 549 if ((all || type == NETCONFA_MC_FORWARDING) && 550 nla_put_s32(skb, NETCONFA_MC_FORWARDING, 551 devconf->mc_forwarding) < 0) 552 goto nla_put_failure; 553 #endif 554 if ((all || type == NETCONFA_PROXY_NEIGH) && 555 nla_put_s32(skb, NETCONFA_PROXY_NEIGH, devconf->proxy_ndp) < 0) 556 goto nla_put_failure; 557 558 if ((all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN) && 559 nla_put_s32(skb, NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN, 560 devconf->ignore_routes_with_linkdown) < 0) 561 goto nla_put_failure; 562 563 nlmsg_end(skb, nlh); 564 return 0; 565 566 nla_put_failure: 567 nlmsg_cancel(skb, nlh); 568 return -EMSGSIZE; 569 } 570 571 void inet6_netconf_notify_devconf(struct net *net, int type, int ifindex, 572 struct ipv6_devconf *devconf) 573 { 574 struct sk_buff *skb; 575 int err = -ENOBUFS; 576 577 skb = nlmsg_new(inet6_netconf_msgsize_devconf(type), GFP_KERNEL); 578 if (!skb) 579 goto errout; 580 581 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 0, 0, 582 RTM_NEWNETCONF, 0, type); 583 if (err < 0) { 584 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */ 585 WARN_ON(err == -EMSGSIZE); 586 kfree_skb(skb); 587 goto errout; 588 } 589 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_NETCONF, NULL, GFP_KERNEL); 590 return; 591 errout: 592 rtnl_set_sk_err(net, RTNLGRP_IPV6_NETCONF, err); 593 } 594 595 static const struct nla_policy devconf_ipv6_policy[NETCONFA_MAX+1] = { 596 [NETCONFA_IFINDEX] = { .len = sizeof(int) }, 597 [NETCONFA_FORWARDING] = { .len = sizeof(int) }, 598 [NETCONFA_PROXY_NEIGH] = { .len = sizeof(int) }, 599 [NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN] = { .len = sizeof(int) }, 600 }; 601 602 static int inet6_netconf_get_devconf(struct sk_buff *in_skb, 603 struct nlmsghdr *nlh) 604 { 605 struct net *net = sock_net(in_skb->sk); 606 struct nlattr *tb[NETCONFA_MAX+1]; 607 struct netconfmsg *ncm; 608 struct sk_buff *skb; 609 struct ipv6_devconf *devconf; 610 struct inet6_dev *in6_dev; 611 struct net_device *dev; 612 int ifindex; 613 int err; 614 615 err = nlmsg_parse(nlh, sizeof(*ncm), tb, NETCONFA_MAX, 616 devconf_ipv6_policy); 617 if (err < 0) 618 goto errout; 619 620 err = -EINVAL; 621 if (!tb[NETCONFA_IFINDEX]) 622 goto errout; 623 624 ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]); 625 switch (ifindex) { 626 case NETCONFA_IFINDEX_ALL: 627 devconf = net->ipv6.devconf_all; 628 break; 629 case NETCONFA_IFINDEX_DEFAULT: 630 devconf = net->ipv6.devconf_dflt; 631 break; 632 default: 633 dev = __dev_get_by_index(net, ifindex); 634 if (!dev) 635 goto errout; 636 in6_dev = __in6_dev_get(dev); 637 if (!in6_dev) 638 goto errout; 639 devconf = &in6_dev->cnf; 640 break; 641 } 642 643 err = -ENOBUFS; 644 skb = nlmsg_new(inet6_netconf_msgsize_devconf(NETCONFA_ALL), GFP_ATOMIC); 645 if (!skb) 646 goto errout; 647 648 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 649 NETLINK_CB(in_skb).portid, 650 nlh->nlmsg_seq, RTM_NEWNETCONF, 0, 651 NETCONFA_ALL); 652 if (err < 0) { 653 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */ 654 WARN_ON(err == -EMSGSIZE); 655 kfree_skb(skb); 656 goto errout; 657 } 658 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid); 659 errout: 660 return err; 661 } 662 663 static int inet6_netconf_dump_devconf(struct sk_buff *skb, 664 struct netlink_callback *cb) 665 { 666 struct net *net = sock_net(skb->sk); 667 int h, s_h; 668 int idx, s_idx; 669 struct net_device *dev; 670 struct inet6_dev *idev; 671 struct hlist_head *head; 672 673 s_h = cb->args[0]; 674 s_idx = idx = cb->args[1]; 675 676 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 677 idx = 0; 678 head = &net->dev_index_head[h]; 679 rcu_read_lock(); 680 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ 681 net->dev_base_seq; 682 hlist_for_each_entry_rcu(dev, head, index_hlist) { 683 if (idx < s_idx) 684 goto cont; 685 idev = __in6_dev_get(dev); 686 if (!idev) 687 goto cont; 688 689 if (inet6_netconf_fill_devconf(skb, dev->ifindex, 690 &idev->cnf, 691 NETLINK_CB(cb->skb).portid, 692 cb->nlh->nlmsg_seq, 693 RTM_NEWNETCONF, 694 NLM_F_MULTI, 695 NETCONFA_ALL) < 0) { 696 rcu_read_unlock(); 697 goto done; 698 } 699 nl_dump_check_consistent(cb, nlmsg_hdr(skb)); 700 cont: 701 idx++; 702 } 703 rcu_read_unlock(); 704 } 705 if (h == NETDEV_HASHENTRIES) { 706 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL, 707 net->ipv6.devconf_all, 708 NETLINK_CB(cb->skb).portid, 709 cb->nlh->nlmsg_seq, 710 RTM_NEWNETCONF, NLM_F_MULTI, 711 NETCONFA_ALL) < 0) 712 goto done; 713 else 714 h++; 715 } 716 if (h == NETDEV_HASHENTRIES + 1) { 717 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT, 718 net->ipv6.devconf_dflt, 719 NETLINK_CB(cb->skb).portid, 720 cb->nlh->nlmsg_seq, 721 RTM_NEWNETCONF, NLM_F_MULTI, 722 NETCONFA_ALL) < 0) 723 goto done; 724 else 725 h++; 726 } 727 done: 728 cb->args[0] = h; 729 cb->args[1] = idx; 730 731 return skb->len; 732 } 733 734 #ifdef CONFIG_SYSCTL 735 static void dev_forward_change(struct inet6_dev *idev) 736 { 737 struct net_device *dev; 738 struct inet6_ifaddr *ifa; 739 740 if (!idev) 741 return; 742 dev = idev->dev; 743 if (idev->cnf.forwarding) 744 dev_disable_lro(dev); 745 if (dev->flags & IFF_MULTICAST) { 746 if (idev->cnf.forwarding) { 747 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters); 748 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allrouters); 749 ipv6_dev_mc_inc(dev, &in6addr_sitelocal_allrouters); 750 } else { 751 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters); 752 ipv6_dev_mc_dec(dev, &in6addr_interfacelocal_allrouters); 753 ipv6_dev_mc_dec(dev, &in6addr_sitelocal_allrouters); 754 } 755 } 756 757 list_for_each_entry(ifa, &idev->addr_list, if_list) { 758 if (ifa->flags&IFA_F_TENTATIVE) 759 continue; 760 if (idev->cnf.forwarding) 761 addrconf_join_anycast(ifa); 762 else 763 addrconf_leave_anycast(ifa); 764 } 765 inet6_netconf_notify_devconf(dev_net(dev), NETCONFA_FORWARDING, 766 dev->ifindex, &idev->cnf); 767 } 768 769 770 static void addrconf_forward_change(struct net *net, __s32 newf) 771 { 772 struct net_device *dev; 773 struct inet6_dev *idev; 774 775 for_each_netdev(net, dev) { 776 idev = __in6_dev_get(dev); 777 if (idev) { 778 int changed = (!idev->cnf.forwarding) ^ (!newf); 779 idev->cnf.forwarding = newf; 780 if (changed) 781 dev_forward_change(idev); 782 } 783 } 784 } 785 786 static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf) 787 { 788 struct net *net; 789 int old; 790 791 if (!rtnl_trylock()) 792 return restart_syscall(); 793 794 net = (struct net *)table->extra2; 795 old = *p; 796 *p = newf; 797 798 if (p == &net->ipv6.devconf_dflt->forwarding) { 799 if ((!newf) ^ (!old)) 800 inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING, 801 NETCONFA_IFINDEX_DEFAULT, 802 net->ipv6.devconf_dflt); 803 rtnl_unlock(); 804 return 0; 805 } 806 807 if (p == &net->ipv6.devconf_all->forwarding) { 808 int old_dflt = net->ipv6.devconf_dflt->forwarding; 809 810 net->ipv6.devconf_dflt->forwarding = newf; 811 if ((!newf) ^ (!old_dflt)) 812 inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING, 813 NETCONFA_IFINDEX_DEFAULT, 814 net->ipv6.devconf_dflt); 815 816 addrconf_forward_change(net, newf); 817 if ((!newf) ^ (!old)) 818 inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING, 819 NETCONFA_IFINDEX_ALL, 820 net->ipv6.devconf_all); 821 } else if ((!newf) ^ (!old)) 822 dev_forward_change((struct inet6_dev *)table->extra1); 823 rtnl_unlock(); 824 825 if (newf) 826 rt6_purge_dflt_routers(net); 827 return 1; 828 } 829 830 static void addrconf_linkdown_change(struct net *net, __s32 newf) 831 { 832 struct net_device *dev; 833 struct inet6_dev *idev; 834 835 for_each_netdev(net, dev) { 836 idev = __in6_dev_get(dev); 837 if (idev) { 838 int changed = (!idev->cnf.ignore_routes_with_linkdown) ^ (!newf); 839 840 idev->cnf.ignore_routes_with_linkdown = newf; 841 if (changed) 842 inet6_netconf_notify_devconf(dev_net(dev), 843 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN, 844 dev->ifindex, 845 &idev->cnf); 846 } 847 } 848 } 849 850 static int addrconf_fixup_linkdown(struct ctl_table *table, int *p, int newf) 851 { 852 struct net *net; 853 int old; 854 855 if (!rtnl_trylock()) 856 return restart_syscall(); 857 858 net = (struct net *)table->extra2; 859 old = *p; 860 *p = newf; 861 862 if (p == &net->ipv6.devconf_dflt->ignore_routes_with_linkdown) { 863 if ((!newf) ^ (!old)) 864 inet6_netconf_notify_devconf(net, 865 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN, 866 NETCONFA_IFINDEX_DEFAULT, 867 net->ipv6.devconf_dflt); 868 rtnl_unlock(); 869 return 0; 870 } 871 872 if (p == &net->ipv6.devconf_all->ignore_routes_with_linkdown) { 873 net->ipv6.devconf_dflt->ignore_routes_with_linkdown = newf; 874 addrconf_linkdown_change(net, newf); 875 if ((!newf) ^ (!old)) 876 inet6_netconf_notify_devconf(net, 877 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN, 878 NETCONFA_IFINDEX_ALL, 879 net->ipv6.devconf_all); 880 } 881 rtnl_unlock(); 882 883 return 1; 884 } 885 886 #endif 887 888 /* Nobody refers to this ifaddr, destroy it */ 889 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp) 890 { 891 WARN_ON(!hlist_unhashed(&ifp->addr_lst)); 892 893 #ifdef NET_REFCNT_DEBUG 894 pr_debug("%s\n", __func__); 895 #endif 896 897 in6_dev_put(ifp->idev); 898 899 if (cancel_delayed_work(&ifp->dad_work)) 900 pr_notice("delayed DAD work was pending while freeing ifa=%p\n", 901 ifp); 902 903 if (ifp->state != INET6_IFADDR_STATE_DEAD) { 904 pr_warn("Freeing alive inet6 address %p\n", ifp); 905 return; 906 } 907 ip6_rt_put(ifp->rt); 908 909 kfree_rcu(ifp, rcu); 910 } 911 912 static void 913 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp) 914 { 915 struct list_head *p; 916 int ifp_scope = ipv6_addr_src_scope(&ifp->addr); 917 918 /* 919 * Each device address list is sorted in order of scope - 920 * global before linklocal. 921 */ 922 list_for_each(p, &idev->addr_list) { 923 struct inet6_ifaddr *ifa 924 = list_entry(p, struct inet6_ifaddr, if_list); 925 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr)) 926 break; 927 } 928 929 list_add_tail(&ifp->if_list, p); 930 } 931 932 static u32 inet6_addr_hash(const struct in6_addr *addr) 933 { 934 return hash_32(ipv6_addr_hash(addr), IN6_ADDR_HSIZE_SHIFT); 935 } 936 937 /* On success it returns ifp with increased reference count */ 938 939 static struct inet6_ifaddr * 940 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, 941 const struct in6_addr *peer_addr, int pfxlen, 942 int scope, u32 flags, u32 valid_lft, u32 prefered_lft) 943 { 944 struct inet6_ifaddr *ifa = NULL; 945 struct rt6_info *rt; 946 unsigned int hash; 947 int err = 0; 948 int addr_type = ipv6_addr_type(addr); 949 950 if (addr_type == IPV6_ADDR_ANY || 951 addr_type & IPV6_ADDR_MULTICAST || 952 (!(idev->dev->flags & IFF_LOOPBACK) && 953 addr_type & IPV6_ADDR_LOOPBACK)) 954 return ERR_PTR(-EADDRNOTAVAIL); 955 956 rcu_read_lock_bh(); 957 if (idev->dead) { 958 err = -ENODEV; /*XXX*/ 959 goto out2; 960 } 961 962 if (idev->cnf.disable_ipv6) { 963 err = -EACCES; 964 goto out2; 965 } 966 967 spin_lock(&addrconf_hash_lock); 968 969 /* Ignore adding duplicate addresses on an interface */ 970 if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) { 971 ADBG("ipv6_add_addr: already assigned\n"); 972 err = -EEXIST; 973 goto out; 974 } 975 976 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC); 977 978 if (!ifa) { 979 ADBG("ipv6_add_addr: malloc failed\n"); 980 err = -ENOBUFS; 981 goto out; 982 } 983 984 rt = addrconf_dst_alloc(idev, addr, false); 985 if (IS_ERR(rt)) { 986 err = PTR_ERR(rt); 987 goto out; 988 } 989 990 neigh_parms_data_state_setall(idev->nd_parms); 991 992 ifa->addr = *addr; 993 if (peer_addr) 994 ifa->peer_addr = *peer_addr; 995 996 spin_lock_init(&ifa->lock); 997 INIT_DELAYED_WORK(&ifa->dad_work, addrconf_dad_work); 998 INIT_HLIST_NODE(&ifa->addr_lst); 999 ifa->scope = scope; 1000 ifa->prefix_len = pfxlen; 1001 ifa->flags = flags | IFA_F_TENTATIVE; 1002 ifa->valid_lft = valid_lft; 1003 ifa->prefered_lft = prefered_lft; 1004 ifa->cstamp = ifa->tstamp = jiffies; 1005 ifa->tokenized = false; 1006 1007 ifa->rt = rt; 1008 1009 ifa->idev = idev; 1010 in6_dev_hold(idev); 1011 /* For caller */ 1012 in6_ifa_hold(ifa); 1013 1014 /* Add to big hash table */ 1015 hash = inet6_addr_hash(addr); 1016 1017 hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]); 1018 spin_unlock(&addrconf_hash_lock); 1019 1020 write_lock(&idev->lock); 1021 /* Add to inet6_dev unicast addr list. */ 1022 ipv6_link_dev_addr(idev, ifa); 1023 1024 if (ifa->flags&IFA_F_TEMPORARY) { 1025 list_add(&ifa->tmp_list, &idev->tempaddr_list); 1026 in6_ifa_hold(ifa); 1027 } 1028 1029 in6_ifa_hold(ifa); 1030 write_unlock(&idev->lock); 1031 out2: 1032 rcu_read_unlock_bh(); 1033 1034 if (likely(err == 0)) 1035 inet6addr_notifier_call_chain(NETDEV_UP, ifa); 1036 else { 1037 kfree(ifa); 1038 ifa = ERR_PTR(err); 1039 } 1040 1041 return ifa; 1042 out: 1043 spin_unlock(&addrconf_hash_lock); 1044 goto out2; 1045 } 1046 1047 enum cleanup_prefix_rt_t { 1048 CLEANUP_PREFIX_RT_NOP, /* no cleanup action for prefix route */ 1049 CLEANUP_PREFIX_RT_DEL, /* delete the prefix route */ 1050 CLEANUP_PREFIX_RT_EXPIRE, /* update the lifetime of the prefix route */ 1051 }; 1052 1053 /* 1054 * Check, whether the prefix for ifp would still need a prefix route 1055 * after deleting ifp. The function returns one of the CLEANUP_PREFIX_RT_* 1056 * constants. 1057 * 1058 * 1) we don't purge prefix if address was not permanent. 1059 * prefix is managed by its own lifetime. 1060 * 2) we also don't purge, if the address was IFA_F_NOPREFIXROUTE. 1061 * 3) if there are no addresses, delete prefix. 1062 * 4) if there are still other permanent address(es), 1063 * corresponding prefix is still permanent. 1064 * 5) if there are still other addresses with IFA_F_NOPREFIXROUTE, 1065 * don't purge the prefix, assume user space is managing it. 1066 * 6) otherwise, update prefix lifetime to the 1067 * longest valid lifetime among the corresponding 1068 * addresses on the device. 1069 * Note: subsequent RA will update lifetime. 1070 **/ 1071 static enum cleanup_prefix_rt_t 1072 check_cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long *expires) 1073 { 1074 struct inet6_ifaddr *ifa; 1075 struct inet6_dev *idev = ifp->idev; 1076 unsigned long lifetime; 1077 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_DEL; 1078 1079 *expires = jiffies; 1080 1081 list_for_each_entry(ifa, &idev->addr_list, if_list) { 1082 if (ifa == ifp) 1083 continue; 1084 if (!ipv6_prefix_equal(&ifa->addr, &ifp->addr, 1085 ifp->prefix_len)) 1086 continue; 1087 if (ifa->flags & (IFA_F_PERMANENT | IFA_F_NOPREFIXROUTE)) 1088 return CLEANUP_PREFIX_RT_NOP; 1089 1090 action = CLEANUP_PREFIX_RT_EXPIRE; 1091 1092 spin_lock(&ifa->lock); 1093 1094 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ); 1095 /* 1096 * Note: Because this address is 1097 * not permanent, lifetime < 1098 * LONG_MAX / HZ here. 1099 */ 1100 if (time_before(*expires, ifa->tstamp + lifetime * HZ)) 1101 *expires = ifa->tstamp + lifetime * HZ; 1102 spin_unlock(&ifa->lock); 1103 } 1104 1105 return action; 1106 } 1107 1108 static void 1109 cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long expires, bool del_rt) 1110 { 1111 struct rt6_info *rt; 1112 1113 rt = addrconf_get_prefix_route(&ifp->addr, 1114 ifp->prefix_len, 1115 ifp->idev->dev, 1116 0, RTF_GATEWAY | RTF_DEFAULT); 1117 if (rt) { 1118 if (del_rt) 1119 ip6_del_rt(rt); 1120 else { 1121 if (!(rt->rt6i_flags & RTF_EXPIRES)) 1122 rt6_set_expires(rt, expires); 1123 ip6_rt_put(rt); 1124 } 1125 } 1126 } 1127 1128 1129 /* This function wants to get referenced ifp and releases it before return */ 1130 1131 static void ipv6_del_addr(struct inet6_ifaddr *ifp) 1132 { 1133 int state; 1134 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_NOP; 1135 unsigned long expires; 1136 1137 ASSERT_RTNL(); 1138 1139 spin_lock_bh(&ifp->lock); 1140 state = ifp->state; 1141 ifp->state = INET6_IFADDR_STATE_DEAD; 1142 spin_unlock_bh(&ifp->lock); 1143 1144 if (state == INET6_IFADDR_STATE_DEAD) 1145 goto out; 1146 1147 spin_lock_bh(&addrconf_hash_lock); 1148 hlist_del_init_rcu(&ifp->addr_lst); 1149 spin_unlock_bh(&addrconf_hash_lock); 1150 1151 write_lock_bh(&ifp->idev->lock); 1152 1153 if (ifp->flags&IFA_F_TEMPORARY) { 1154 list_del(&ifp->tmp_list); 1155 if (ifp->ifpub) { 1156 in6_ifa_put(ifp->ifpub); 1157 ifp->ifpub = NULL; 1158 } 1159 __in6_ifa_put(ifp); 1160 } 1161 1162 if (ifp->flags & IFA_F_PERMANENT && !(ifp->flags & IFA_F_NOPREFIXROUTE)) 1163 action = check_cleanup_prefix_route(ifp, &expires); 1164 1165 list_del_init(&ifp->if_list); 1166 __in6_ifa_put(ifp); 1167 1168 write_unlock_bh(&ifp->idev->lock); 1169 1170 addrconf_del_dad_work(ifp); 1171 1172 ipv6_ifa_notify(RTM_DELADDR, ifp); 1173 1174 inet6addr_notifier_call_chain(NETDEV_DOWN, ifp); 1175 1176 if (action != CLEANUP_PREFIX_RT_NOP) { 1177 cleanup_prefix_route(ifp, expires, 1178 action == CLEANUP_PREFIX_RT_DEL); 1179 } 1180 1181 /* clean up prefsrc entries */ 1182 rt6_remove_prefsrc(ifp); 1183 out: 1184 in6_ifa_put(ifp); 1185 } 1186 1187 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift) 1188 { 1189 struct inet6_dev *idev = ifp->idev; 1190 struct in6_addr addr, *tmpaddr; 1191 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_tstamp, age; 1192 unsigned long regen_advance; 1193 int tmp_plen; 1194 int ret = 0; 1195 u32 addr_flags; 1196 unsigned long now = jiffies; 1197 long max_desync_factor; 1198 s32 cnf_temp_preferred_lft; 1199 1200 write_lock_bh(&idev->lock); 1201 if (ift) { 1202 spin_lock_bh(&ift->lock); 1203 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8); 1204 spin_unlock_bh(&ift->lock); 1205 tmpaddr = &addr; 1206 } else { 1207 tmpaddr = NULL; 1208 } 1209 retry: 1210 in6_dev_hold(idev); 1211 if (idev->cnf.use_tempaddr <= 0) { 1212 write_unlock_bh(&idev->lock); 1213 pr_info("%s: use_tempaddr is disabled\n", __func__); 1214 in6_dev_put(idev); 1215 ret = -1; 1216 goto out; 1217 } 1218 spin_lock_bh(&ifp->lock); 1219 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) { 1220 idev->cnf.use_tempaddr = -1; /*XXX*/ 1221 spin_unlock_bh(&ifp->lock); 1222 write_unlock_bh(&idev->lock); 1223 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n", 1224 __func__); 1225 in6_dev_put(idev); 1226 ret = -1; 1227 goto out; 1228 } 1229 in6_ifa_hold(ifp); 1230 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8); 1231 ipv6_try_regen_rndid(idev, tmpaddr); 1232 memcpy(&addr.s6_addr[8], idev->rndid, 8); 1233 age = (now - ifp->tstamp) / HZ; 1234 1235 regen_advance = idev->cnf.regen_max_retry * 1236 idev->cnf.dad_transmits * 1237 NEIGH_VAR(idev->nd_parms, RETRANS_TIME) / HZ; 1238 1239 /* recalculate max_desync_factor each time and update 1240 * idev->desync_factor if it's larger 1241 */ 1242 cnf_temp_preferred_lft = READ_ONCE(idev->cnf.temp_prefered_lft); 1243 max_desync_factor = min_t(__u32, 1244 idev->cnf.max_desync_factor, 1245 cnf_temp_preferred_lft - regen_advance); 1246 1247 if (unlikely(idev->desync_factor > max_desync_factor)) { 1248 if (max_desync_factor > 0) { 1249 get_random_bytes(&idev->desync_factor, 1250 sizeof(idev->desync_factor)); 1251 idev->desync_factor %= max_desync_factor; 1252 } else { 1253 idev->desync_factor = 0; 1254 } 1255 } 1256 1257 tmp_valid_lft = min_t(__u32, 1258 ifp->valid_lft, 1259 idev->cnf.temp_valid_lft + age); 1260 tmp_prefered_lft = cnf_temp_preferred_lft + age - 1261 idev->desync_factor; 1262 tmp_prefered_lft = min_t(__u32, ifp->prefered_lft, tmp_prefered_lft); 1263 tmp_plen = ifp->prefix_len; 1264 tmp_tstamp = ifp->tstamp; 1265 spin_unlock_bh(&ifp->lock); 1266 1267 write_unlock_bh(&idev->lock); 1268 1269 /* A temporary address is created only if this calculated Preferred 1270 * Lifetime is greater than REGEN_ADVANCE time units. In particular, 1271 * an implementation must not create a temporary address with a zero 1272 * Preferred Lifetime. 1273 * Use age calculation as in addrconf_verify to avoid unnecessary 1274 * temporary addresses being generated. 1275 */ 1276 age = (now - tmp_tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ; 1277 if (tmp_prefered_lft <= regen_advance + age) { 1278 in6_ifa_put(ifp); 1279 in6_dev_put(idev); 1280 ret = -1; 1281 goto out; 1282 } 1283 1284 addr_flags = IFA_F_TEMPORARY; 1285 /* set in addrconf_prefix_rcv() */ 1286 if (ifp->flags & IFA_F_OPTIMISTIC) 1287 addr_flags |= IFA_F_OPTIMISTIC; 1288 1289 ift = ipv6_add_addr(idev, &addr, NULL, tmp_plen, 1290 ipv6_addr_scope(&addr), addr_flags, 1291 tmp_valid_lft, tmp_prefered_lft); 1292 if (IS_ERR(ift)) { 1293 in6_ifa_put(ifp); 1294 in6_dev_put(idev); 1295 pr_info("%s: retry temporary address regeneration\n", __func__); 1296 tmpaddr = &addr; 1297 write_lock_bh(&idev->lock); 1298 goto retry; 1299 } 1300 1301 spin_lock_bh(&ift->lock); 1302 ift->ifpub = ifp; 1303 ift->cstamp = now; 1304 ift->tstamp = tmp_tstamp; 1305 spin_unlock_bh(&ift->lock); 1306 1307 addrconf_dad_start(ift); 1308 in6_ifa_put(ift); 1309 in6_dev_put(idev); 1310 out: 1311 return ret; 1312 } 1313 1314 /* 1315 * Choose an appropriate source address (RFC3484) 1316 */ 1317 enum { 1318 IPV6_SADDR_RULE_INIT = 0, 1319 IPV6_SADDR_RULE_LOCAL, 1320 IPV6_SADDR_RULE_SCOPE, 1321 IPV6_SADDR_RULE_PREFERRED, 1322 #ifdef CONFIG_IPV6_MIP6 1323 IPV6_SADDR_RULE_HOA, 1324 #endif 1325 IPV6_SADDR_RULE_OIF, 1326 IPV6_SADDR_RULE_LABEL, 1327 IPV6_SADDR_RULE_PRIVACY, 1328 IPV6_SADDR_RULE_ORCHID, 1329 IPV6_SADDR_RULE_PREFIX, 1330 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1331 IPV6_SADDR_RULE_NOT_OPTIMISTIC, 1332 #endif 1333 IPV6_SADDR_RULE_MAX 1334 }; 1335 1336 struct ipv6_saddr_score { 1337 int rule; 1338 int addr_type; 1339 struct inet6_ifaddr *ifa; 1340 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX); 1341 int scopedist; 1342 int matchlen; 1343 }; 1344 1345 struct ipv6_saddr_dst { 1346 const struct in6_addr *addr; 1347 int ifindex; 1348 int scope; 1349 int label; 1350 unsigned int prefs; 1351 }; 1352 1353 static inline int ipv6_saddr_preferred(int type) 1354 { 1355 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK)) 1356 return 1; 1357 return 0; 1358 } 1359 1360 static inline bool ipv6_use_optimistic_addr(struct inet6_dev *idev) 1361 { 1362 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1363 return idev && idev->cnf.optimistic_dad && idev->cnf.use_optimistic; 1364 #else 1365 return false; 1366 #endif 1367 } 1368 1369 static int ipv6_get_saddr_eval(struct net *net, 1370 struct ipv6_saddr_score *score, 1371 struct ipv6_saddr_dst *dst, 1372 int i) 1373 { 1374 int ret; 1375 1376 if (i <= score->rule) { 1377 switch (i) { 1378 case IPV6_SADDR_RULE_SCOPE: 1379 ret = score->scopedist; 1380 break; 1381 case IPV6_SADDR_RULE_PREFIX: 1382 ret = score->matchlen; 1383 break; 1384 default: 1385 ret = !!test_bit(i, score->scorebits); 1386 } 1387 goto out; 1388 } 1389 1390 switch (i) { 1391 case IPV6_SADDR_RULE_INIT: 1392 /* Rule 0: remember if hiscore is not ready yet */ 1393 ret = !!score->ifa; 1394 break; 1395 case IPV6_SADDR_RULE_LOCAL: 1396 /* Rule 1: Prefer same address */ 1397 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr); 1398 break; 1399 case IPV6_SADDR_RULE_SCOPE: 1400 /* Rule 2: Prefer appropriate scope 1401 * 1402 * ret 1403 * ^ 1404 * -1 | d 15 1405 * ---+--+-+---> scope 1406 * | 1407 * | d is scope of the destination. 1408 * B-d | \ 1409 * | \ <- smaller scope is better if 1410 * B-15 | \ if scope is enough for destination. 1411 * | ret = B - scope (-1 <= scope >= d <= 15). 1412 * d-C-1 | / 1413 * |/ <- greater is better 1414 * -C / if scope is not enough for destination. 1415 * /| ret = scope - C (-1 <= d < scope <= 15). 1416 * 1417 * d - C - 1 < B -15 (for all -1 <= d <= 15). 1418 * C > d + 14 - B >= 15 + 14 - B = 29 - B. 1419 * Assume B = 0 and we get C > 29. 1420 */ 1421 ret = __ipv6_addr_src_scope(score->addr_type); 1422 if (ret >= dst->scope) 1423 ret = -ret; 1424 else 1425 ret -= 128; /* 30 is enough */ 1426 score->scopedist = ret; 1427 break; 1428 case IPV6_SADDR_RULE_PREFERRED: 1429 { 1430 /* Rule 3: Avoid deprecated and optimistic addresses */ 1431 u8 avoid = IFA_F_DEPRECATED; 1432 1433 if (!ipv6_use_optimistic_addr(score->ifa->idev)) 1434 avoid |= IFA_F_OPTIMISTIC; 1435 ret = ipv6_saddr_preferred(score->addr_type) || 1436 !(score->ifa->flags & avoid); 1437 break; 1438 } 1439 #ifdef CONFIG_IPV6_MIP6 1440 case IPV6_SADDR_RULE_HOA: 1441 { 1442 /* Rule 4: Prefer home address */ 1443 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA); 1444 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome; 1445 break; 1446 } 1447 #endif 1448 case IPV6_SADDR_RULE_OIF: 1449 /* Rule 5: Prefer outgoing interface */ 1450 ret = (!dst->ifindex || 1451 dst->ifindex == score->ifa->idev->dev->ifindex); 1452 break; 1453 case IPV6_SADDR_RULE_LABEL: 1454 /* Rule 6: Prefer matching label */ 1455 ret = ipv6_addr_label(net, 1456 &score->ifa->addr, score->addr_type, 1457 score->ifa->idev->dev->ifindex) == dst->label; 1458 break; 1459 case IPV6_SADDR_RULE_PRIVACY: 1460 { 1461 /* Rule 7: Prefer public address 1462 * Note: prefer temporary address if use_tempaddr >= 2 1463 */ 1464 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ? 1465 !!(dst->prefs & IPV6_PREFER_SRC_TMP) : 1466 score->ifa->idev->cnf.use_tempaddr >= 2; 1467 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp; 1468 break; 1469 } 1470 case IPV6_SADDR_RULE_ORCHID: 1471 /* Rule 8-: Prefer ORCHID vs ORCHID or 1472 * non-ORCHID vs non-ORCHID 1473 */ 1474 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^ 1475 ipv6_addr_orchid(dst->addr)); 1476 break; 1477 case IPV6_SADDR_RULE_PREFIX: 1478 /* Rule 8: Use longest matching prefix */ 1479 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr); 1480 if (ret > score->ifa->prefix_len) 1481 ret = score->ifa->prefix_len; 1482 score->matchlen = ret; 1483 break; 1484 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1485 case IPV6_SADDR_RULE_NOT_OPTIMISTIC: 1486 /* Optimistic addresses still have lower precedence than other 1487 * preferred addresses. 1488 */ 1489 ret = !(score->ifa->flags & IFA_F_OPTIMISTIC); 1490 break; 1491 #endif 1492 default: 1493 ret = 0; 1494 } 1495 1496 if (ret) 1497 __set_bit(i, score->scorebits); 1498 score->rule = i; 1499 out: 1500 return ret; 1501 } 1502 1503 static int __ipv6_dev_get_saddr(struct net *net, 1504 struct ipv6_saddr_dst *dst, 1505 struct inet6_dev *idev, 1506 struct ipv6_saddr_score *scores, 1507 int hiscore_idx) 1508 { 1509 struct ipv6_saddr_score *score = &scores[1 - hiscore_idx], *hiscore = &scores[hiscore_idx]; 1510 1511 read_lock_bh(&idev->lock); 1512 list_for_each_entry(score->ifa, &idev->addr_list, if_list) { 1513 int i; 1514 1515 /* 1516 * - Tentative Address (RFC2462 section 5.4) 1517 * - A tentative address is not considered 1518 * "assigned to an interface" in the traditional 1519 * sense, unless it is also flagged as optimistic. 1520 * - Candidate Source Address (section 4) 1521 * - In any case, anycast addresses, multicast 1522 * addresses, and the unspecified address MUST 1523 * NOT be included in a candidate set. 1524 */ 1525 if ((score->ifa->flags & IFA_F_TENTATIVE) && 1526 (!(score->ifa->flags & IFA_F_OPTIMISTIC))) 1527 continue; 1528 1529 score->addr_type = __ipv6_addr_type(&score->ifa->addr); 1530 1531 if (unlikely(score->addr_type == IPV6_ADDR_ANY || 1532 score->addr_type & IPV6_ADDR_MULTICAST)) { 1533 net_dbg_ratelimited("ADDRCONF: unspecified / multicast address assigned as unicast address on %s", 1534 idev->dev->name); 1535 continue; 1536 } 1537 1538 score->rule = -1; 1539 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX); 1540 1541 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) { 1542 int minihiscore, miniscore; 1543 1544 minihiscore = ipv6_get_saddr_eval(net, hiscore, dst, i); 1545 miniscore = ipv6_get_saddr_eval(net, score, dst, i); 1546 1547 if (minihiscore > miniscore) { 1548 if (i == IPV6_SADDR_RULE_SCOPE && 1549 score->scopedist > 0) { 1550 /* 1551 * special case: 1552 * each remaining entry 1553 * has too small (not enough) 1554 * scope, because ifa entries 1555 * are sorted by their scope 1556 * values. 1557 */ 1558 goto out; 1559 } 1560 break; 1561 } else if (minihiscore < miniscore) { 1562 if (hiscore->ifa) 1563 in6_ifa_put(hiscore->ifa); 1564 1565 in6_ifa_hold(score->ifa); 1566 1567 swap(hiscore, score); 1568 hiscore_idx = 1 - hiscore_idx; 1569 1570 /* restore our iterator */ 1571 score->ifa = hiscore->ifa; 1572 1573 break; 1574 } 1575 } 1576 } 1577 out: 1578 read_unlock_bh(&idev->lock); 1579 return hiscore_idx; 1580 } 1581 1582 static int ipv6_get_saddr_master(struct net *net, 1583 const struct net_device *dst_dev, 1584 const struct net_device *master, 1585 struct ipv6_saddr_dst *dst, 1586 struct ipv6_saddr_score *scores, 1587 int hiscore_idx) 1588 { 1589 struct inet6_dev *idev; 1590 1591 idev = __in6_dev_get(dst_dev); 1592 if (idev) 1593 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev, 1594 scores, hiscore_idx); 1595 1596 idev = __in6_dev_get(master); 1597 if (idev) 1598 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev, 1599 scores, hiscore_idx); 1600 1601 return hiscore_idx; 1602 } 1603 1604 int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev, 1605 const struct in6_addr *daddr, unsigned int prefs, 1606 struct in6_addr *saddr) 1607 { 1608 struct ipv6_saddr_score scores[2], *hiscore; 1609 struct ipv6_saddr_dst dst; 1610 struct inet6_dev *idev; 1611 struct net_device *dev; 1612 int dst_type; 1613 bool use_oif_addr = false; 1614 int hiscore_idx = 0; 1615 1616 dst_type = __ipv6_addr_type(daddr); 1617 dst.addr = daddr; 1618 dst.ifindex = dst_dev ? dst_dev->ifindex : 0; 1619 dst.scope = __ipv6_addr_src_scope(dst_type); 1620 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex); 1621 dst.prefs = prefs; 1622 1623 scores[hiscore_idx].rule = -1; 1624 scores[hiscore_idx].ifa = NULL; 1625 1626 rcu_read_lock(); 1627 1628 /* Candidate Source Address (section 4) 1629 * - multicast and link-local destination address, 1630 * the set of candidate source address MUST only 1631 * include addresses assigned to interfaces 1632 * belonging to the same link as the outgoing 1633 * interface. 1634 * (- For site-local destination addresses, the 1635 * set of candidate source addresses MUST only 1636 * include addresses assigned to interfaces 1637 * belonging to the same site as the outgoing 1638 * interface.) 1639 * - "It is RECOMMENDED that the candidate source addresses 1640 * be the set of unicast addresses assigned to the 1641 * interface that will be used to send to the destination 1642 * (the 'outgoing' interface)." (RFC 6724) 1643 */ 1644 if (dst_dev) { 1645 idev = __in6_dev_get(dst_dev); 1646 if ((dst_type & IPV6_ADDR_MULTICAST) || 1647 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL || 1648 (idev && idev->cnf.use_oif_addrs_only)) { 1649 use_oif_addr = true; 1650 } 1651 } 1652 1653 if (use_oif_addr) { 1654 if (idev) 1655 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx); 1656 } else { 1657 const struct net_device *master; 1658 int master_idx = 0; 1659 1660 /* if dst_dev exists and is enslaved to an L3 device, then 1661 * prefer addresses from dst_dev and then the master over 1662 * any other enslaved devices in the L3 domain. 1663 */ 1664 master = l3mdev_master_dev_rcu(dst_dev); 1665 if (master) { 1666 master_idx = master->ifindex; 1667 1668 hiscore_idx = ipv6_get_saddr_master(net, dst_dev, 1669 master, &dst, 1670 scores, hiscore_idx); 1671 1672 if (scores[hiscore_idx].ifa) 1673 goto out; 1674 } 1675 1676 for_each_netdev_rcu(net, dev) { 1677 /* only consider addresses on devices in the 1678 * same L3 domain 1679 */ 1680 if (l3mdev_master_ifindex_rcu(dev) != master_idx) 1681 continue; 1682 idev = __in6_dev_get(dev); 1683 if (!idev) 1684 continue; 1685 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx); 1686 } 1687 } 1688 1689 out: 1690 rcu_read_unlock(); 1691 1692 hiscore = &scores[hiscore_idx]; 1693 if (!hiscore->ifa) 1694 return -EADDRNOTAVAIL; 1695 1696 *saddr = hiscore->ifa->addr; 1697 in6_ifa_put(hiscore->ifa); 1698 return 0; 1699 } 1700 EXPORT_SYMBOL(ipv6_dev_get_saddr); 1701 1702 int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr, 1703 u32 banned_flags) 1704 { 1705 struct inet6_ifaddr *ifp; 1706 int err = -EADDRNOTAVAIL; 1707 1708 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) { 1709 if (ifp->scope > IFA_LINK) 1710 break; 1711 if (ifp->scope == IFA_LINK && 1712 !(ifp->flags & banned_flags)) { 1713 *addr = ifp->addr; 1714 err = 0; 1715 break; 1716 } 1717 } 1718 return err; 1719 } 1720 1721 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr, 1722 u32 banned_flags) 1723 { 1724 struct inet6_dev *idev; 1725 int err = -EADDRNOTAVAIL; 1726 1727 rcu_read_lock(); 1728 idev = __in6_dev_get(dev); 1729 if (idev) { 1730 read_lock_bh(&idev->lock); 1731 err = __ipv6_get_lladdr(idev, addr, banned_flags); 1732 read_unlock_bh(&idev->lock); 1733 } 1734 rcu_read_unlock(); 1735 return err; 1736 } 1737 1738 static int ipv6_count_addresses(struct inet6_dev *idev) 1739 { 1740 int cnt = 0; 1741 struct inet6_ifaddr *ifp; 1742 1743 read_lock_bh(&idev->lock); 1744 list_for_each_entry(ifp, &idev->addr_list, if_list) 1745 cnt++; 1746 read_unlock_bh(&idev->lock); 1747 return cnt; 1748 } 1749 1750 int ipv6_chk_addr(struct net *net, const struct in6_addr *addr, 1751 const struct net_device *dev, int strict) 1752 { 1753 return ipv6_chk_addr_and_flags(net, addr, dev, strict, IFA_F_TENTATIVE); 1754 } 1755 EXPORT_SYMBOL(ipv6_chk_addr); 1756 1757 int ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr, 1758 const struct net_device *dev, int strict, 1759 u32 banned_flags) 1760 { 1761 struct inet6_ifaddr *ifp; 1762 unsigned int hash = inet6_addr_hash(addr); 1763 u32 ifp_flags; 1764 1765 rcu_read_lock_bh(); 1766 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) { 1767 if (!net_eq(dev_net(ifp->idev->dev), net)) 1768 continue; 1769 /* Decouple optimistic from tentative for evaluation here. 1770 * Ban optimistic addresses explicitly, when required. 1771 */ 1772 ifp_flags = (ifp->flags&IFA_F_OPTIMISTIC) 1773 ? (ifp->flags&~IFA_F_TENTATIVE) 1774 : ifp->flags; 1775 if (ipv6_addr_equal(&ifp->addr, addr) && 1776 !(ifp_flags&banned_flags) && 1777 (!dev || ifp->idev->dev == dev || 1778 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) { 1779 rcu_read_unlock_bh(); 1780 return 1; 1781 } 1782 } 1783 1784 rcu_read_unlock_bh(); 1785 return 0; 1786 } 1787 EXPORT_SYMBOL(ipv6_chk_addr_and_flags); 1788 1789 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr, 1790 struct net_device *dev) 1791 { 1792 unsigned int hash = inet6_addr_hash(addr); 1793 struct inet6_ifaddr *ifp; 1794 1795 hlist_for_each_entry(ifp, &inet6_addr_lst[hash], addr_lst) { 1796 if (!net_eq(dev_net(ifp->idev->dev), net)) 1797 continue; 1798 if (ipv6_addr_equal(&ifp->addr, addr)) { 1799 if (!dev || ifp->idev->dev == dev) 1800 return true; 1801 } 1802 } 1803 return false; 1804 } 1805 1806 /* Compares an address/prefix_len with addresses on device @dev. 1807 * If one is found it returns true. 1808 */ 1809 bool ipv6_chk_custom_prefix(const struct in6_addr *addr, 1810 const unsigned int prefix_len, struct net_device *dev) 1811 { 1812 struct inet6_dev *idev; 1813 struct inet6_ifaddr *ifa; 1814 bool ret = false; 1815 1816 rcu_read_lock(); 1817 idev = __in6_dev_get(dev); 1818 if (idev) { 1819 read_lock_bh(&idev->lock); 1820 list_for_each_entry(ifa, &idev->addr_list, if_list) { 1821 ret = ipv6_prefix_equal(addr, &ifa->addr, prefix_len); 1822 if (ret) 1823 break; 1824 } 1825 read_unlock_bh(&idev->lock); 1826 } 1827 rcu_read_unlock(); 1828 1829 return ret; 1830 } 1831 EXPORT_SYMBOL(ipv6_chk_custom_prefix); 1832 1833 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev) 1834 { 1835 struct inet6_dev *idev; 1836 struct inet6_ifaddr *ifa; 1837 int onlink; 1838 1839 onlink = 0; 1840 rcu_read_lock(); 1841 idev = __in6_dev_get(dev); 1842 if (idev) { 1843 read_lock_bh(&idev->lock); 1844 list_for_each_entry(ifa, &idev->addr_list, if_list) { 1845 onlink = ipv6_prefix_equal(addr, &ifa->addr, 1846 ifa->prefix_len); 1847 if (onlink) 1848 break; 1849 } 1850 read_unlock_bh(&idev->lock); 1851 } 1852 rcu_read_unlock(); 1853 return onlink; 1854 } 1855 EXPORT_SYMBOL(ipv6_chk_prefix); 1856 1857 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr, 1858 struct net_device *dev, int strict) 1859 { 1860 struct inet6_ifaddr *ifp, *result = NULL; 1861 unsigned int hash = inet6_addr_hash(addr); 1862 1863 rcu_read_lock_bh(); 1864 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) { 1865 if (!net_eq(dev_net(ifp->idev->dev), net)) 1866 continue; 1867 if (ipv6_addr_equal(&ifp->addr, addr)) { 1868 if (!dev || ifp->idev->dev == dev || 1869 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) { 1870 result = ifp; 1871 in6_ifa_hold(ifp); 1872 break; 1873 } 1874 } 1875 } 1876 rcu_read_unlock_bh(); 1877 1878 return result; 1879 } 1880 1881 /* Gets referenced address, destroys ifaddr */ 1882 1883 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed) 1884 { 1885 if (dad_failed) 1886 ifp->flags |= IFA_F_DADFAILED; 1887 1888 if (ifp->flags&IFA_F_PERMANENT) { 1889 spin_lock_bh(&ifp->lock); 1890 addrconf_del_dad_work(ifp); 1891 ifp->flags |= IFA_F_TENTATIVE; 1892 spin_unlock_bh(&ifp->lock); 1893 if (dad_failed) 1894 ipv6_ifa_notify(0, ifp); 1895 in6_ifa_put(ifp); 1896 } else if (ifp->flags&IFA_F_TEMPORARY) { 1897 struct inet6_ifaddr *ifpub; 1898 spin_lock_bh(&ifp->lock); 1899 ifpub = ifp->ifpub; 1900 if (ifpub) { 1901 in6_ifa_hold(ifpub); 1902 spin_unlock_bh(&ifp->lock); 1903 ipv6_create_tempaddr(ifpub, ifp); 1904 in6_ifa_put(ifpub); 1905 } else { 1906 spin_unlock_bh(&ifp->lock); 1907 } 1908 ipv6_del_addr(ifp); 1909 } else { 1910 ipv6_del_addr(ifp); 1911 } 1912 } 1913 1914 static int addrconf_dad_end(struct inet6_ifaddr *ifp) 1915 { 1916 int err = -ENOENT; 1917 1918 spin_lock_bh(&ifp->lock); 1919 if (ifp->state == INET6_IFADDR_STATE_DAD) { 1920 ifp->state = INET6_IFADDR_STATE_POSTDAD; 1921 err = 0; 1922 } 1923 spin_unlock_bh(&ifp->lock); 1924 1925 return err; 1926 } 1927 1928 void addrconf_dad_failure(struct inet6_ifaddr *ifp) 1929 { 1930 struct inet6_dev *idev = ifp->idev; 1931 struct net *net = dev_net(ifp->idev->dev); 1932 1933 if (addrconf_dad_end(ifp)) { 1934 in6_ifa_put(ifp); 1935 return; 1936 } 1937 1938 net_info_ratelimited("%s: IPv6 duplicate address %pI6c detected!\n", 1939 ifp->idev->dev->name, &ifp->addr); 1940 1941 spin_lock_bh(&ifp->lock); 1942 1943 if (ifp->flags & IFA_F_STABLE_PRIVACY) { 1944 int scope = ifp->scope; 1945 u32 flags = ifp->flags; 1946 struct in6_addr new_addr; 1947 struct inet6_ifaddr *ifp2; 1948 u32 valid_lft, preferred_lft; 1949 int pfxlen = ifp->prefix_len; 1950 int retries = ifp->stable_privacy_retry + 1; 1951 1952 if (retries > net->ipv6.sysctl.idgen_retries) { 1953 net_info_ratelimited("%s: privacy stable address generation failed because of DAD conflicts!\n", 1954 ifp->idev->dev->name); 1955 goto errdad; 1956 } 1957 1958 new_addr = ifp->addr; 1959 if (ipv6_generate_stable_address(&new_addr, retries, 1960 idev)) 1961 goto errdad; 1962 1963 valid_lft = ifp->valid_lft; 1964 preferred_lft = ifp->prefered_lft; 1965 1966 spin_unlock_bh(&ifp->lock); 1967 1968 if (idev->cnf.max_addresses && 1969 ipv6_count_addresses(idev) >= 1970 idev->cnf.max_addresses) 1971 goto lock_errdad; 1972 1973 net_info_ratelimited("%s: generating new stable privacy address because of DAD conflict\n", 1974 ifp->idev->dev->name); 1975 1976 ifp2 = ipv6_add_addr(idev, &new_addr, NULL, pfxlen, 1977 scope, flags, valid_lft, 1978 preferred_lft); 1979 if (IS_ERR(ifp2)) 1980 goto lock_errdad; 1981 1982 spin_lock_bh(&ifp2->lock); 1983 ifp2->stable_privacy_retry = retries; 1984 ifp2->state = INET6_IFADDR_STATE_PREDAD; 1985 spin_unlock_bh(&ifp2->lock); 1986 1987 addrconf_mod_dad_work(ifp2, net->ipv6.sysctl.idgen_delay); 1988 in6_ifa_put(ifp2); 1989 lock_errdad: 1990 spin_lock_bh(&ifp->lock); 1991 } 1992 1993 errdad: 1994 /* transition from _POSTDAD to _ERRDAD */ 1995 ifp->state = INET6_IFADDR_STATE_ERRDAD; 1996 spin_unlock_bh(&ifp->lock); 1997 1998 addrconf_mod_dad_work(ifp, 0); 1999 in6_ifa_put(ifp); 2000 } 2001 2002 /* Join to solicited addr multicast group. 2003 * caller must hold RTNL */ 2004 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr) 2005 { 2006 struct in6_addr maddr; 2007 2008 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP)) 2009 return; 2010 2011 addrconf_addr_solict_mult(addr, &maddr); 2012 ipv6_dev_mc_inc(dev, &maddr); 2013 } 2014 2015 /* caller must hold RTNL */ 2016 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr) 2017 { 2018 struct in6_addr maddr; 2019 2020 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP)) 2021 return; 2022 2023 addrconf_addr_solict_mult(addr, &maddr); 2024 __ipv6_dev_mc_dec(idev, &maddr); 2025 } 2026 2027 /* caller must hold RTNL */ 2028 static void addrconf_join_anycast(struct inet6_ifaddr *ifp) 2029 { 2030 struct in6_addr addr; 2031 2032 if (ifp->prefix_len >= 127) /* RFC 6164 */ 2033 return; 2034 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len); 2035 if (ipv6_addr_any(&addr)) 2036 return; 2037 __ipv6_dev_ac_inc(ifp->idev, &addr); 2038 } 2039 2040 /* caller must hold RTNL */ 2041 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp) 2042 { 2043 struct in6_addr addr; 2044 2045 if (ifp->prefix_len >= 127) /* RFC 6164 */ 2046 return; 2047 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len); 2048 if (ipv6_addr_any(&addr)) 2049 return; 2050 __ipv6_dev_ac_dec(ifp->idev, &addr); 2051 } 2052 2053 static int addrconf_ifid_eui64(u8 *eui, struct net_device *dev) 2054 { 2055 if (dev->addr_len != EUI64_ADDR_LEN) 2056 return -1; 2057 memcpy(eui, dev->dev_addr, EUI64_ADDR_LEN); 2058 eui[0] ^= 2; 2059 return 0; 2060 } 2061 2062 static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev) 2063 { 2064 union fwnet_hwaddr *ha; 2065 2066 if (dev->addr_len != FWNET_ALEN) 2067 return -1; 2068 2069 ha = (union fwnet_hwaddr *)dev->dev_addr; 2070 2071 memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id)); 2072 eui[0] ^= 2; 2073 return 0; 2074 } 2075 2076 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev) 2077 { 2078 /* XXX: inherit EUI-64 from other interface -- yoshfuji */ 2079 if (dev->addr_len != ARCNET_ALEN) 2080 return -1; 2081 memset(eui, 0, 7); 2082 eui[7] = *(u8 *)dev->dev_addr; 2083 return 0; 2084 } 2085 2086 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev) 2087 { 2088 if (dev->addr_len != INFINIBAND_ALEN) 2089 return -1; 2090 memcpy(eui, dev->dev_addr + 12, 8); 2091 eui[0] |= 2; 2092 return 0; 2093 } 2094 2095 static int __ipv6_isatap_ifid(u8 *eui, __be32 addr) 2096 { 2097 if (addr == 0) 2098 return -1; 2099 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) || 2100 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) || 2101 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) || 2102 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) || 2103 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) || 2104 ipv4_is_lbcast(addr)) ? 0x00 : 0x02; 2105 eui[1] = 0; 2106 eui[2] = 0x5E; 2107 eui[3] = 0xFE; 2108 memcpy(eui + 4, &addr, 4); 2109 return 0; 2110 } 2111 2112 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev) 2113 { 2114 if (dev->priv_flags & IFF_ISATAP) 2115 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr); 2116 return -1; 2117 } 2118 2119 static int addrconf_ifid_gre(u8 *eui, struct net_device *dev) 2120 { 2121 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr); 2122 } 2123 2124 static int addrconf_ifid_ip6tnl(u8 *eui, struct net_device *dev) 2125 { 2126 memcpy(eui, dev->perm_addr, 3); 2127 memcpy(eui + 5, dev->perm_addr + 3, 3); 2128 eui[3] = 0xFF; 2129 eui[4] = 0xFE; 2130 eui[0] ^= 2; 2131 return 0; 2132 } 2133 2134 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev) 2135 { 2136 switch (dev->type) { 2137 case ARPHRD_ETHER: 2138 case ARPHRD_FDDI: 2139 return addrconf_ifid_eui48(eui, dev); 2140 case ARPHRD_ARCNET: 2141 return addrconf_ifid_arcnet(eui, dev); 2142 case ARPHRD_INFINIBAND: 2143 return addrconf_ifid_infiniband(eui, dev); 2144 case ARPHRD_SIT: 2145 return addrconf_ifid_sit(eui, dev); 2146 case ARPHRD_IPGRE: 2147 return addrconf_ifid_gre(eui, dev); 2148 case ARPHRD_6LOWPAN: 2149 return addrconf_ifid_eui64(eui, dev); 2150 case ARPHRD_IEEE1394: 2151 return addrconf_ifid_ieee1394(eui, dev); 2152 case ARPHRD_TUNNEL6: 2153 return addrconf_ifid_ip6tnl(eui, dev); 2154 } 2155 return -1; 2156 } 2157 2158 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev) 2159 { 2160 int err = -1; 2161 struct inet6_ifaddr *ifp; 2162 2163 read_lock_bh(&idev->lock); 2164 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) { 2165 if (ifp->scope > IFA_LINK) 2166 break; 2167 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) { 2168 memcpy(eui, ifp->addr.s6_addr+8, 8); 2169 err = 0; 2170 break; 2171 } 2172 } 2173 read_unlock_bh(&idev->lock); 2174 return err; 2175 } 2176 2177 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */ 2178 static void ipv6_regen_rndid(struct inet6_dev *idev) 2179 { 2180 regen: 2181 get_random_bytes(idev->rndid, sizeof(idev->rndid)); 2182 idev->rndid[0] &= ~0x02; 2183 2184 /* 2185 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>: 2186 * check if generated address is not inappropriate 2187 * 2188 * - Reserved subnet anycast (RFC 2526) 2189 * 11111101 11....11 1xxxxxxx 2190 * - ISATAP (RFC4214) 6.1 2191 * 00-00-5E-FE-xx-xx-xx-xx 2192 * - value 0 2193 * - XXX: already assigned to an address on the device 2194 */ 2195 if (idev->rndid[0] == 0xfd && 2196 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff && 2197 (idev->rndid[7]&0x80)) 2198 goto regen; 2199 if ((idev->rndid[0]|idev->rndid[1]) == 0) { 2200 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe) 2201 goto regen; 2202 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00) 2203 goto regen; 2204 } 2205 } 2206 2207 static void ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) 2208 { 2209 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0) 2210 ipv6_regen_rndid(idev); 2211 } 2212 2213 /* 2214 * Add prefix route. 2215 */ 2216 2217 static void 2218 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev, 2219 unsigned long expires, u32 flags) 2220 { 2221 struct fib6_config cfg = { 2222 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX, 2223 .fc_metric = IP6_RT_PRIO_ADDRCONF, 2224 .fc_ifindex = dev->ifindex, 2225 .fc_expires = expires, 2226 .fc_dst_len = plen, 2227 .fc_flags = RTF_UP | flags, 2228 .fc_nlinfo.nl_net = dev_net(dev), 2229 .fc_protocol = RTPROT_KERNEL, 2230 }; 2231 2232 cfg.fc_dst = *pfx; 2233 2234 /* Prevent useless cloning on PtP SIT. 2235 This thing is done here expecting that the whole 2236 class of non-broadcast devices need not cloning. 2237 */ 2238 #if IS_ENABLED(CONFIG_IPV6_SIT) 2239 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT)) 2240 cfg.fc_flags |= RTF_NONEXTHOP; 2241 #endif 2242 2243 ip6_route_add(&cfg); 2244 } 2245 2246 2247 static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx, 2248 int plen, 2249 const struct net_device *dev, 2250 u32 flags, u32 noflags) 2251 { 2252 struct fib6_node *fn; 2253 struct rt6_info *rt = NULL; 2254 struct fib6_table *table; 2255 u32 tb_id = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX; 2256 2257 table = fib6_get_table(dev_net(dev), tb_id); 2258 if (!table) 2259 return NULL; 2260 2261 read_lock_bh(&table->tb6_lock); 2262 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0); 2263 if (!fn) 2264 goto out; 2265 2266 noflags |= RTF_CACHE; 2267 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) { 2268 if (rt->dst.dev->ifindex != dev->ifindex) 2269 continue; 2270 if ((rt->rt6i_flags & flags) != flags) 2271 continue; 2272 if ((rt->rt6i_flags & noflags) != 0) 2273 continue; 2274 dst_hold(&rt->dst); 2275 break; 2276 } 2277 out: 2278 read_unlock_bh(&table->tb6_lock); 2279 return rt; 2280 } 2281 2282 2283 /* Create "default" multicast route to the interface */ 2284 2285 static void addrconf_add_mroute(struct net_device *dev) 2286 { 2287 struct fib6_config cfg = { 2288 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_LOCAL, 2289 .fc_metric = IP6_RT_PRIO_ADDRCONF, 2290 .fc_ifindex = dev->ifindex, 2291 .fc_dst_len = 8, 2292 .fc_flags = RTF_UP, 2293 .fc_nlinfo.nl_net = dev_net(dev), 2294 }; 2295 2296 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0); 2297 2298 ip6_route_add(&cfg); 2299 } 2300 2301 static struct inet6_dev *addrconf_add_dev(struct net_device *dev) 2302 { 2303 struct inet6_dev *idev; 2304 2305 ASSERT_RTNL(); 2306 2307 idev = ipv6_find_idev(dev); 2308 if (!idev) 2309 return ERR_PTR(-ENOBUFS); 2310 2311 if (idev->cnf.disable_ipv6) 2312 return ERR_PTR(-EACCES); 2313 2314 /* Add default multicast route */ 2315 if (!(dev->flags & IFF_LOOPBACK) && !netif_is_l3_master(dev)) 2316 addrconf_add_mroute(dev); 2317 2318 return idev; 2319 } 2320 2321 static void manage_tempaddrs(struct inet6_dev *idev, 2322 struct inet6_ifaddr *ifp, 2323 __u32 valid_lft, __u32 prefered_lft, 2324 bool create, unsigned long now) 2325 { 2326 u32 flags; 2327 struct inet6_ifaddr *ift; 2328 2329 read_lock_bh(&idev->lock); 2330 /* update all temporary addresses in the list */ 2331 list_for_each_entry(ift, &idev->tempaddr_list, tmp_list) { 2332 int age, max_valid, max_prefered; 2333 2334 if (ifp != ift->ifpub) 2335 continue; 2336 2337 /* RFC 4941 section 3.3: 2338 * If a received option will extend the lifetime of a public 2339 * address, the lifetimes of temporary addresses should 2340 * be extended, subject to the overall constraint that no 2341 * temporary addresses should ever remain "valid" or "preferred" 2342 * for a time longer than (TEMP_VALID_LIFETIME) or 2343 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), respectively. 2344 */ 2345 age = (now - ift->cstamp) / HZ; 2346 max_valid = idev->cnf.temp_valid_lft - age; 2347 if (max_valid < 0) 2348 max_valid = 0; 2349 2350 max_prefered = idev->cnf.temp_prefered_lft - 2351 idev->desync_factor - age; 2352 if (max_prefered < 0) 2353 max_prefered = 0; 2354 2355 if (valid_lft > max_valid) 2356 valid_lft = max_valid; 2357 2358 if (prefered_lft > max_prefered) 2359 prefered_lft = max_prefered; 2360 2361 spin_lock(&ift->lock); 2362 flags = ift->flags; 2363 ift->valid_lft = valid_lft; 2364 ift->prefered_lft = prefered_lft; 2365 ift->tstamp = now; 2366 if (prefered_lft > 0) 2367 ift->flags &= ~IFA_F_DEPRECATED; 2368 2369 spin_unlock(&ift->lock); 2370 if (!(flags&IFA_F_TENTATIVE)) 2371 ipv6_ifa_notify(0, ift); 2372 } 2373 2374 if ((create || list_empty(&idev->tempaddr_list)) && 2375 idev->cnf.use_tempaddr > 0) { 2376 /* When a new public address is created as described 2377 * in [ADDRCONF], also create a new temporary address. 2378 * Also create a temporary address if it's enabled but 2379 * no temporary address currently exists. 2380 */ 2381 read_unlock_bh(&idev->lock); 2382 ipv6_create_tempaddr(ifp, NULL); 2383 } else { 2384 read_unlock_bh(&idev->lock); 2385 } 2386 } 2387 2388 static bool is_addr_mode_generate_stable(struct inet6_dev *idev) 2389 { 2390 return idev->addr_gen_mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY || 2391 idev->addr_gen_mode == IN6_ADDR_GEN_MODE_RANDOM; 2392 } 2393 2394 int addrconf_prefix_rcv_add_addr(struct net *net, struct net_device *dev, 2395 const struct prefix_info *pinfo, 2396 struct inet6_dev *in6_dev, 2397 const struct in6_addr *addr, int addr_type, 2398 u32 addr_flags, bool sllao, bool tokenized, 2399 __u32 valid_lft, u32 prefered_lft) 2400 { 2401 struct inet6_ifaddr *ifp = ipv6_get_ifaddr(net, addr, dev, 1); 2402 int create = 0, update_lft = 0; 2403 2404 if (!ifp && valid_lft) { 2405 int max_addresses = in6_dev->cnf.max_addresses; 2406 2407 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 2408 if (in6_dev->cnf.optimistic_dad && 2409 !net->ipv6.devconf_all->forwarding && sllao) 2410 addr_flags |= IFA_F_OPTIMISTIC; 2411 #endif 2412 2413 /* Do not allow to create too much of autoconfigured 2414 * addresses; this would be too easy way to crash kernel. 2415 */ 2416 if (!max_addresses || 2417 ipv6_count_addresses(in6_dev) < max_addresses) 2418 ifp = ipv6_add_addr(in6_dev, addr, NULL, 2419 pinfo->prefix_len, 2420 addr_type&IPV6_ADDR_SCOPE_MASK, 2421 addr_flags, valid_lft, 2422 prefered_lft); 2423 2424 if (IS_ERR_OR_NULL(ifp)) 2425 return -1; 2426 2427 update_lft = 0; 2428 create = 1; 2429 spin_lock_bh(&ifp->lock); 2430 ifp->flags |= IFA_F_MANAGETEMPADDR; 2431 ifp->cstamp = jiffies; 2432 ifp->tokenized = tokenized; 2433 spin_unlock_bh(&ifp->lock); 2434 addrconf_dad_start(ifp); 2435 } 2436 2437 if (ifp) { 2438 u32 flags; 2439 unsigned long now; 2440 u32 stored_lft; 2441 2442 /* update lifetime (RFC2462 5.5.3 e) */ 2443 spin_lock_bh(&ifp->lock); 2444 now = jiffies; 2445 if (ifp->valid_lft > (now - ifp->tstamp) / HZ) 2446 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ; 2447 else 2448 stored_lft = 0; 2449 if (!update_lft && !create && stored_lft) { 2450 const u32 minimum_lft = min_t(u32, 2451 stored_lft, MIN_VALID_LIFETIME); 2452 valid_lft = max(valid_lft, minimum_lft); 2453 2454 /* RFC4862 Section 5.5.3e: 2455 * "Note that the preferred lifetime of the 2456 * corresponding address is always reset to 2457 * the Preferred Lifetime in the received 2458 * Prefix Information option, regardless of 2459 * whether the valid lifetime is also reset or 2460 * ignored." 2461 * 2462 * So we should always update prefered_lft here. 2463 */ 2464 update_lft = 1; 2465 } 2466 2467 if (update_lft) { 2468 ifp->valid_lft = valid_lft; 2469 ifp->prefered_lft = prefered_lft; 2470 ifp->tstamp = now; 2471 flags = ifp->flags; 2472 ifp->flags &= ~IFA_F_DEPRECATED; 2473 spin_unlock_bh(&ifp->lock); 2474 2475 if (!(flags&IFA_F_TENTATIVE)) 2476 ipv6_ifa_notify(0, ifp); 2477 } else 2478 spin_unlock_bh(&ifp->lock); 2479 2480 manage_tempaddrs(in6_dev, ifp, valid_lft, prefered_lft, 2481 create, now); 2482 2483 in6_ifa_put(ifp); 2484 addrconf_verify(); 2485 } 2486 2487 return 0; 2488 } 2489 EXPORT_SYMBOL_GPL(addrconf_prefix_rcv_add_addr); 2490 2491 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao) 2492 { 2493 struct prefix_info *pinfo; 2494 __u32 valid_lft; 2495 __u32 prefered_lft; 2496 int addr_type, err; 2497 u32 addr_flags = 0; 2498 struct inet6_dev *in6_dev; 2499 struct net *net = dev_net(dev); 2500 2501 pinfo = (struct prefix_info *) opt; 2502 2503 if (len < sizeof(struct prefix_info)) { 2504 ADBG("addrconf: prefix option too short\n"); 2505 return; 2506 } 2507 2508 /* 2509 * Validation checks ([ADDRCONF], page 19) 2510 */ 2511 2512 addr_type = ipv6_addr_type(&pinfo->prefix); 2513 2514 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL)) 2515 return; 2516 2517 valid_lft = ntohl(pinfo->valid); 2518 prefered_lft = ntohl(pinfo->prefered); 2519 2520 if (prefered_lft > valid_lft) { 2521 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n"); 2522 return; 2523 } 2524 2525 in6_dev = in6_dev_get(dev); 2526 2527 if (!in6_dev) { 2528 net_dbg_ratelimited("addrconf: device %s not configured\n", 2529 dev->name); 2530 return; 2531 } 2532 2533 /* 2534 * Two things going on here: 2535 * 1) Add routes for on-link prefixes 2536 * 2) Configure prefixes with the auto flag set 2537 */ 2538 2539 if (pinfo->onlink) { 2540 struct rt6_info *rt; 2541 unsigned long rt_expires; 2542 2543 /* Avoid arithmetic overflow. Really, we could 2544 * save rt_expires in seconds, likely valid_lft, 2545 * but it would require division in fib gc, that it 2546 * not good. 2547 */ 2548 if (HZ > USER_HZ) 2549 rt_expires = addrconf_timeout_fixup(valid_lft, HZ); 2550 else 2551 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ); 2552 2553 if (addrconf_finite_timeout(rt_expires)) 2554 rt_expires *= HZ; 2555 2556 rt = addrconf_get_prefix_route(&pinfo->prefix, 2557 pinfo->prefix_len, 2558 dev, 2559 RTF_ADDRCONF | RTF_PREFIX_RT, 2560 RTF_GATEWAY | RTF_DEFAULT); 2561 2562 if (rt) { 2563 /* Autoconf prefix route */ 2564 if (valid_lft == 0) { 2565 ip6_del_rt(rt); 2566 rt = NULL; 2567 } else if (addrconf_finite_timeout(rt_expires)) { 2568 /* not infinity */ 2569 rt6_set_expires(rt, jiffies + rt_expires); 2570 } else { 2571 rt6_clean_expires(rt); 2572 } 2573 } else if (valid_lft) { 2574 clock_t expires = 0; 2575 int flags = RTF_ADDRCONF | RTF_PREFIX_RT; 2576 if (addrconf_finite_timeout(rt_expires)) { 2577 /* not infinity */ 2578 flags |= RTF_EXPIRES; 2579 expires = jiffies_to_clock_t(rt_expires); 2580 } 2581 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len, 2582 dev, expires, flags); 2583 } 2584 ip6_rt_put(rt); 2585 } 2586 2587 /* Try to figure out our local address for this prefix */ 2588 2589 if (pinfo->autoconf && in6_dev->cnf.autoconf) { 2590 struct in6_addr addr; 2591 bool tokenized = false, dev_addr_generated = false; 2592 2593 if (pinfo->prefix_len == 64) { 2594 memcpy(&addr, &pinfo->prefix, 8); 2595 2596 if (!ipv6_addr_any(&in6_dev->token)) { 2597 read_lock_bh(&in6_dev->lock); 2598 memcpy(addr.s6_addr + 8, 2599 in6_dev->token.s6_addr + 8, 8); 2600 read_unlock_bh(&in6_dev->lock); 2601 tokenized = true; 2602 } else if (is_addr_mode_generate_stable(in6_dev) && 2603 !ipv6_generate_stable_address(&addr, 0, 2604 in6_dev)) { 2605 addr_flags |= IFA_F_STABLE_PRIVACY; 2606 goto ok; 2607 } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) && 2608 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) { 2609 goto put; 2610 } else { 2611 dev_addr_generated = true; 2612 } 2613 goto ok; 2614 } 2615 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n", 2616 pinfo->prefix_len); 2617 goto put; 2618 2619 ok: 2620 err = addrconf_prefix_rcv_add_addr(net, dev, pinfo, in6_dev, 2621 &addr, addr_type, 2622 addr_flags, sllao, 2623 tokenized, valid_lft, 2624 prefered_lft); 2625 if (err) 2626 goto put; 2627 2628 /* Ignore error case here because previous prefix add addr was 2629 * successful which will be notified. 2630 */ 2631 ndisc_ops_prefix_rcv_add_addr(net, dev, pinfo, in6_dev, &addr, 2632 addr_type, addr_flags, sllao, 2633 tokenized, valid_lft, 2634 prefered_lft, 2635 dev_addr_generated); 2636 } 2637 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo); 2638 put: 2639 in6_dev_put(in6_dev); 2640 } 2641 2642 /* 2643 * Set destination address. 2644 * Special case for SIT interfaces where we create a new "virtual" 2645 * device. 2646 */ 2647 int addrconf_set_dstaddr(struct net *net, void __user *arg) 2648 { 2649 struct in6_ifreq ireq; 2650 struct net_device *dev; 2651 int err = -EINVAL; 2652 2653 rtnl_lock(); 2654 2655 err = -EFAULT; 2656 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2657 goto err_exit; 2658 2659 dev = __dev_get_by_index(net, ireq.ifr6_ifindex); 2660 2661 err = -ENODEV; 2662 if (!dev) 2663 goto err_exit; 2664 2665 #if IS_ENABLED(CONFIG_IPV6_SIT) 2666 if (dev->type == ARPHRD_SIT) { 2667 const struct net_device_ops *ops = dev->netdev_ops; 2668 struct ifreq ifr; 2669 struct ip_tunnel_parm p; 2670 2671 err = -EADDRNOTAVAIL; 2672 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4)) 2673 goto err_exit; 2674 2675 memset(&p, 0, sizeof(p)); 2676 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3]; 2677 p.iph.saddr = 0; 2678 p.iph.version = 4; 2679 p.iph.ihl = 5; 2680 p.iph.protocol = IPPROTO_IPV6; 2681 p.iph.ttl = 64; 2682 ifr.ifr_ifru.ifru_data = (__force void __user *)&p; 2683 2684 if (ops->ndo_do_ioctl) { 2685 mm_segment_t oldfs = get_fs(); 2686 2687 set_fs(KERNEL_DS); 2688 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL); 2689 set_fs(oldfs); 2690 } else 2691 err = -EOPNOTSUPP; 2692 2693 if (err == 0) { 2694 err = -ENOBUFS; 2695 dev = __dev_get_by_name(net, p.name); 2696 if (!dev) 2697 goto err_exit; 2698 err = dev_open(dev); 2699 } 2700 } 2701 #endif 2702 2703 err_exit: 2704 rtnl_unlock(); 2705 return err; 2706 } 2707 2708 static int ipv6_mc_config(struct sock *sk, bool join, 2709 const struct in6_addr *addr, int ifindex) 2710 { 2711 int ret; 2712 2713 ASSERT_RTNL(); 2714 2715 lock_sock(sk); 2716 if (join) 2717 ret = ipv6_sock_mc_join(sk, ifindex, addr); 2718 else 2719 ret = ipv6_sock_mc_drop(sk, ifindex, addr); 2720 release_sock(sk); 2721 2722 return ret; 2723 } 2724 2725 /* 2726 * Manual configuration of address on an interface 2727 */ 2728 static int inet6_addr_add(struct net *net, int ifindex, 2729 const struct in6_addr *pfx, 2730 const struct in6_addr *peer_pfx, 2731 unsigned int plen, __u32 ifa_flags, 2732 __u32 prefered_lft, __u32 valid_lft) 2733 { 2734 struct inet6_ifaddr *ifp; 2735 struct inet6_dev *idev; 2736 struct net_device *dev; 2737 unsigned long timeout; 2738 clock_t expires; 2739 int scope; 2740 u32 flags; 2741 2742 ASSERT_RTNL(); 2743 2744 if (plen > 128) 2745 return -EINVAL; 2746 2747 /* check the lifetime */ 2748 if (!valid_lft || prefered_lft > valid_lft) 2749 return -EINVAL; 2750 2751 if (ifa_flags & IFA_F_MANAGETEMPADDR && plen != 64) 2752 return -EINVAL; 2753 2754 dev = __dev_get_by_index(net, ifindex); 2755 if (!dev) 2756 return -ENODEV; 2757 2758 idev = addrconf_add_dev(dev); 2759 if (IS_ERR(idev)) 2760 return PTR_ERR(idev); 2761 2762 if (ifa_flags & IFA_F_MCAUTOJOIN) { 2763 int ret = ipv6_mc_config(net->ipv6.mc_autojoin_sk, 2764 true, pfx, ifindex); 2765 2766 if (ret < 0) 2767 return ret; 2768 } 2769 2770 scope = ipv6_addr_scope(pfx); 2771 2772 timeout = addrconf_timeout_fixup(valid_lft, HZ); 2773 if (addrconf_finite_timeout(timeout)) { 2774 expires = jiffies_to_clock_t(timeout * HZ); 2775 valid_lft = timeout; 2776 flags = RTF_EXPIRES; 2777 } else { 2778 expires = 0; 2779 flags = 0; 2780 ifa_flags |= IFA_F_PERMANENT; 2781 } 2782 2783 timeout = addrconf_timeout_fixup(prefered_lft, HZ); 2784 if (addrconf_finite_timeout(timeout)) { 2785 if (timeout == 0) 2786 ifa_flags |= IFA_F_DEPRECATED; 2787 prefered_lft = timeout; 2788 } 2789 2790 ifp = ipv6_add_addr(idev, pfx, peer_pfx, plen, scope, ifa_flags, 2791 valid_lft, prefered_lft); 2792 2793 if (!IS_ERR(ifp)) { 2794 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) { 2795 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev, 2796 expires, flags); 2797 } 2798 2799 /* 2800 * Note that section 3.1 of RFC 4429 indicates 2801 * that the Optimistic flag should not be set for 2802 * manually configured addresses 2803 */ 2804 addrconf_dad_start(ifp); 2805 if (ifa_flags & IFA_F_MANAGETEMPADDR) 2806 manage_tempaddrs(idev, ifp, valid_lft, prefered_lft, 2807 true, jiffies); 2808 in6_ifa_put(ifp); 2809 addrconf_verify_rtnl(); 2810 return 0; 2811 } else if (ifa_flags & IFA_F_MCAUTOJOIN) { 2812 ipv6_mc_config(net->ipv6.mc_autojoin_sk, 2813 false, pfx, ifindex); 2814 } 2815 2816 return PTR_ERR(ifp); 2817 } 2818 2819 static int inet6_addr_del(struct net *net, int ifindex, u32 ifa_flags, 2820 const struct in6_addr *pfx, unsigned int plen) 2821 { 2822 struct inet6_ifaddr *ifp; 2823 struct inet6_dev *idev; 2824 struct net_device *dev; 2825 2826 if (plen > 128) 2827 return -EINVAL; 2828 2829 dev = __dev_get_by_index(net, ifindex); 2830 if (!dev) 2831 return -ENODEV; 2832 2833 idev = __in6_dev_get(dev); 2834 if (!idev) 2835 return -ENXIO; 2836 2837 read_lock_bh(&idev->lock); 2838 list_for_each_entry(ifp, &idev->addr_list, if_list) { 2839 if (ifp->prefix_len == plen && 2840 ipv6_addr_equal(pfx, &ifp->addr)) { 2841 in6_ifa_hold(ifp); 2842 read_unlock_bh(&idev->lock); 2843 2844 if (!(ifp->flags & IFA_F_TEMPORARY) && 2845 (ifa_flags & IFA_F_MANAGETEMPADDR)) 2846 manage_tempaddrs(idev, ifp, 0, 0, false, 2847 jiffies); 2848 ipv6_del_addr(ifp); 2849 addrconf_verify_rtnl(); 2850 if (ipv6_addr_is_multicast(pfx)) { 2851 ipv6_mc_config(net->ipv6.mc_autojoin_sk, 2852 false, pfx, dev->ifindex); 2853 } 2854 return 0; 2855 } 2856 } 2857 read_unlock_bh(&idev->lock); 2858 return -EADDRNOTAVAIL; 2859 } 2860 2861 2862 int addrconf_add_ifaddr(struct net *net, void __user *arg) 2863 { 2864 struct in6_ifreq ireq; 2865 int err; 2866 2867 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 2868 return -EPERM; 2869 2870 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2871 return -EFAULT; 2872 2873 rtnl_lock(); 2874 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, NULL, 2875 ireq.ifr6_prefixlen, IFA_F_PERMANENT, 2876 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME); 2877 rtnl_unlock(); 2878 return err; 2879 } 2880 2881 int addrconf_del_ifaddr(struct net *net, void __user *arg) 2882 { 2883 struct in6_ifreq ireq; 2884 int err; 2885 2886 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 2887 return -EPERM; 2888 2889 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2890 return -EFAULT; 2891 2892 rtnl_lock(); 2893 err = inet6_addr_del(net, ireq.ifr6_ifindex, 0, &ireq.ifr6_addr, 2894 ireq.ifr6_prefixlen); 2895 rtnl_unlock(); 2896 return err; 2897 } 2898 2899 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr, 2900 int plen, int scope) 2901 { 2902 struct inet6_ifaddr *ifp; 2903 2904 ifp = ipv6_add_addr(idev, addr, NULL, plen, 2905 scope, IFA_F_PERMANENT, 2906 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME); 2907 if (!IS_ERR(ifp)) { 2908 spin_lock_bh(&ifp->lock); 2909 ifp->flags &= ~IFA_F_TENTATIVE; 2910 spin_unlock_bh(&ifp->lock); 2911 rt_genid_bump_ipv6(dev_net(idev->dev)); 2912 ipv6_ifa_notify(RTM_NEWADDR, ifp); 2913 in6_ifa_put(ifp); 2914 } 2915 } 2916 2917 #if IS_ENABLED(CONFIG_IPV6_SIT) 2918 static void sit_add_v4_addrs(struct inet6_dev *idev) 2919 { 2920 struct in6_addr addr; 2921 struct net_device *dev; 2922 struct net *net = dev_net(idev->dev); 2923 int scope, plen; 2924 u32 pflags = 0; 2925 2926 ASSERT_RTNL(); 2927 2928 memset(&addr, 0, sizeof(struct in6_addr)); 2929 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4); 2930 2931 if (idev->dev->flags&IFF_POINTOPOINT) { 2932 addr.s6_addr32[0] = htonl(0xfe800000); 2933 scope = IFA_LINK; 2934 plen = 64; 2935 } else { 2936 scope = IPV6_ADDR_COMPATv4; 2937 plen = 96; 2938 pflags |= RTF_NONEXTHOP; 2939 } 2940 2941 if (addr.s6_addr32[3]) { 2942 add_addr(idev, &addr, plen, scope); 2943 addrconf_prefix_route(&addr, plen, idev->dev, 0, pflags); 2944 return; 2945 } 2946 2947 for_each_netdev(net, dev) { 2948 struct in_device *in_dev = __in_dev_get_rtnl(dev); 2949 if (in_dev && (dev->flags & IFF_UP)) { 2950 struct in_ifaddr *ifa; 2951 2952 int flag = scope; 2953 2954 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) { 2955 2956 addr.s6_addr32[3] = ifa->ifa_local; 2957 2958 if (ifa->ifa_scope == RT_SCOPE_LINK) 2959 continue; 2960 if (ifa->ifa_scope >= RT_SCOPE_HOST) { 2961 if (idev->dev->flags&IFF_POINTOPOINT) 2962 continue; 2963 flag |= IFA_HOST; 2964 } 2965 2966 add_addr(idev, &addr, plen, flag); 2967 addrconf_prefix_route(&addr, plen, idev->dev, 0, 2968 pflags); 2969 } 2970 } 2971 } 2972 } 2973 #endif 2974 2975 static void init_loopback(struct net_device *dev) 2976 { 2977 struct inet6_dev *idev; 2978 struct net_device *sp_dev; 2979 struct inet6_ifaddr *sp_ifa; 2980 struct rt6_info *sp_rt; 2981 2982 /* ::1 */ 2983 2984 ASSERT_RTNL(); 2985 2986 idev = ipv6_find_idev(dev); 2987 if (!idev) { 2988 pr_debug("%s: add_dev failed\n", __func__); 2989 return; 2990 } 2991 2992 add_addr(idev, &in6addr_loopback, 128, IFA_HOST); 2993 2994 /* Add routes to other interface's IPv6 addresses */ 2995 for_each_netdev(dev_net(dev), sp_dev) { 2996 if (!strcmp(sp_dev->name, dev->name)) 2997 continue; 2998 2999 idev = __in6_dev_get(sp_dev); 3000 if (!idev) 3001 continue; 3002 3003 read_lock_bh(&idev->lock); 3004 list_for_each_entry(sp_ifa, &idev->addr_list, if_list) { 3005 3006 if (sp_ifa->flags & (IFA_F_DADFAILED | IFA_F_TENTATIVE)) 3007 continue; 3008 3009 if (sp_ifa->rt) { 3010 /* This dst has been added to garbage list when 3011 * lo device down, release this obsolete dst and 3012 * reallocate a new router for ifa. 3013 */ 3014 if (!atomic_read(&sp_ifa->rt->rt6i_ref)) { 3015 ip6_rt_put(sp_ifa->rt); 3016 sp_ifa->rt = NULL; 3017 } else { 3018 continue; 3019 } 3020 } 3021 3022 sp_rt = addrconf_dst_alloc(idev, &sp_ifa->addr, false); 3023 3024 /* Failure cases are ignored */ 3025 if (!IS_ERR(sp_rt)) { 3026 sp_ifa->rt = sp_rt; 3027 ip6_ins_rt(sp_rt); 3028 } 3029 } 3030 read_unlock_bh(&idev->lock); 3031 } 3032 } 3033 3034 void addrconf_add_linklocal(struct inet6_dev *idev, 3035 const struct in6_addr *addr, u32 flags) 3036 { 3037 struct inet6_ifaddr *ifp; 3038 u32 addr_flags = flags | IFA_F_PERMANENT; 3039 3040 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 3041 if (idev->cnf.optimistic_dad && 3042 !dev_net(idev->dev)->ipv6.devconf_all->forwarding) 3043 addr_flags |= IFA_F_OPTIMISTIC; 3044 #endif 3045 3046 ifp = ipv6_add_addr(idev, addr, NULL, 64, IFA_LINK, addr_flags, 3047 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME); 3048 if (!IS_ERR(ifp)) { 3049 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0); 3050 addrconf_dad_start(ifp); 3051 in6_ifa_put(ifp); 3052 } 3053 } 3054 EXPORT_SYMBOL_GPL(addrconf_add_linklocal); 3055 3056 static bool ipv6_reserved_interfaceid(struct in6_addr address) 3057 { 3058 if ((address.s6_addr32[2] | address.s6_addr32[3]) == 0) 3059 return true; 3060 3061 if (address.s6_addr32[2] == htonl(0x02005eff) && 3062 ((address.s6_addr32[3] & htonl(0xfe000000)) == htonl(0xfe000000))) 3063 return true; 3064 3065 if (address.s6_addr32[2] == htonl(0xfdffffff) && 3066 ((address.s6_addr32[3] & htonl(0xffffff80)) == htonl(0xffffff80))) 3067 return true; 3068 3069 return false; 3070 } 3071 3072 static int ipv6_generate_stable_address(struct in6_addr *address, 3073 u8 dad_count, 3074 const struct inet6_dev *idev) 3075 { 3076 static DEFINE_SPINLOCK(lock); 3077 static __u32 digest[SHA_DIGEST_WORDS]; 3078 static __u32 workspace[SHA_WORKSPACE_WORDS]; 3079 3080 static union { 3081 char __data[SHA_MESSAGE_BYTES]; 3082 struct { 3083 struct in6_addr secret; 3084 __be32 prefix[2]; 3085 unsigned char hwaddr[MAX_ADDR_LEN]; 3086 u8 dad_count; 3087 } __packed; 3088 } data; 3089 3090 struct in6_addr secret; 3091 struct in6_addr temp; 3092 struct net *net = dev_net(idev->dev); 3093 3094 BUILD_BUG_ON(sizeof(data.__data) != sizeof(data)); 3095 3096 if (idev->cnf.stable_secret.initialized) 3097 secret = idev->cnf.stable_secret.secret; 3098 else if (net->ipv6.devconf_dflt->stable_secret.initialized) 3099 secret = net->ipv6.devconf_dflt->stable_secret.secret; 3100 else 3101 return -1; 3102 3103 retry: 3104 spin_lock_bh(&lock); 3105 3106 sha_init(digest); 3107 memset(&data, 0, sizeof(data)); 3108 memset(workspace, 0, sizeof(workspace)); 3109 memcpy(data.hwaddr, idev->dev->perm_addr, idev->dev->addr_len); 3110 data.prefix[0] = address->s6_addr32[0]; 3111 data.prefix[1] = address->s6_addr32[1]; 3112 data.secret = secret; 3113 data.dad_count = dad_count; 3114 3115 sha_transform(digest, data.__data, workspace); 3116 3117 temp = *address; 3118 temp.s6_addr32[2] = (__force __be32)digest[0]; 3119 temp.s6_addr32[3] = (__force __be32)digest[1]; 3120 3121 spin_unlock_bh(&lock); 3122 3123 if (ipv6_reserved_interfaceid(temp)) { 3124 dad_count++; 3125 if (dad_count > dev_net(idev->dev)->ipv6.sysctl.idgen_retries) 3126 return -1; 3127 goto retry; 3128 } 3129 3130 *address = temp; 3131 return 0; 3132 } 3133 3134 static void ipv6_gen_mode_random_init(struct inet6_dev *idev) 3135 { 3136 struct ipv6_stable_secret *s = &idev->cnf.stable_secret; 3137 3138 if (s->initialized) 3139 return; 3140 s = &idev->cnf.stable_secret; 3141 get_random_bytes(&s->secret, sizeof(s->secret)); 3142 s->initialized = true; 3143 } 3144 3145 static void addrconf_addr_gen(struct inet6_dev *idev, bool prefix_route) 3146 { 3147 struct in6_addr addr; 3148 3149 /* no link local addresses on L3 master devices */ 3150 if (netif_is_l3_master(idev->dev)) 3151 return; 3152 3153 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0); 3154 3155 switch (idev->addr_gen_mode) { 3156 case IN6_ADDR_GEN_MODE_RANDOM: 3157 ipv6_gen_mode_random_init(idev); 3158 /* fallthrough */ 3159 case IN6_ADDR_GEN_MODE_STABLE_PRIVACY: 3160 if (!ipv6_generate_stable_address(&addr, 0, idev)) 3161 addrconf_add_linklocal(idev, &addr, 3162 IFA_F_STABLE_PRIVACY); 3163 else if (prefix_route) 3164 addrconf_prefix_route(&addr, 64, idev->dev, 0, 0); 3165 break; 3166 case IN6_ADDR_GEN_MODE_EUI64: 3167 /* addrconf_add_linklocal also adds a prefix_route and we 3168 * only need to care about prefix routes if ipv6_generate_eui64 3169 * couldn't generate one. 3170 */ 3171 if (ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) == 0) 3172 addrconf_add_linklocal(idev, &addr, 0); 3173 else if (prefix_route) 3174 addrconf_prefix_route(&addr, 64, idev->dev, 0, 0); 3175 break; 3176 case IN6_ADDR_GEN_MODE_NONE: 3177 default: 3178 /* will not add any link local address */ 3179 break; 3180 } 3181 } 3182 3183 static void addrconf_dev_config(struct net_device *dev) 3184 { 3185 struct inet6_dev *idev; 3186 3187 ASSERT_RTNL(); 3188 3189 if ((dev->type != ARPHRD_ETHER) && 3190 (dev->type != ARPHRD_FDDI) && 3191 (dev->type != ARPHRD_ARCNET) && 3192 (dev->type != ARPHRD_INFINIBAND) && 3193 (dev->type != ARPHRD_IEEE1394) && 3194 (dev->type != ARPHRD_TUNNEL6) && 3195 (dev->type != ARPHRD_6LOWPAN) && 3196 (dev->type != ARPHRD_NONE)) { 3197 /* Alas, we support only Ethernet autoconfiguration. */ 3198 return; 3199 } 3200 3201 idev = addrconf_add_dev(dev); 3202 if (IS_ERR(idev)) 3203 return; 3204 3205 /* this device type has no EUI support */ 3206 if (dev->type == ARPHRD_NONE && 3207 idev->addr_gen_mode == IN6_ADDR_GEN_MODE_EUI64) 3208 idev->addr_gen_mode = IN6_ADDR_GEN_MODE_RANDOM; 3209 3210 addrconf_addr_gen(idev, false); 3211 } 3212 3213 #if IS_ENABLED(CONFIG_IPV6_SIT) 3214 static void addrconf_sit_config(struct net_device *dev) 3215 { 3216 struct inet6_dev *idev; 3217 3218 ASSERT_RTNL(); 3219 3220 /* 3221 * Configure the tunnel with one of our IPv4 3222 * addresses... we should configure all of 3223 * our v4 addrs in the tunnel 3224 */ 3225 3226 idev = ipv6_find_idev(dev); 3227 if (!idev) { 3228 pr_debug("%s: add_dev failed\n", __func__); 3229 return; 3230 } 3231 3232 if (dev->priv_flags & IFF_ISATAP) { 3233 addrconf_addr_gen(idev, false); 3234 return; 3235 } 3236 3237 sit_add_v4_addrs(idev); 3238 3239 if (dev->flags&IFF_POINTOPOINT) 3240 addrconf_add_mroute(dev); 3241 } 3242 #endif 3243 3244 #if IS_ENABLED(CONFIG_NET_IPGRE) 3245 static void addrconf_gre_config(struct net_device *dev) 3246 { 3247 struct inet6_dev *idev; 3248 3249 ASSERT_RTNL(); 3250 3251 idev = ipv6_find_idev(dev); 3252 if (!idev) { 3253 pr_debug("%s: add_dev failed\n", __func__); 3254 return; 3255 } 3256 3257 addrconf_addr_gen(idev, true); 3258 if (dev->flags & IFF_POINTOPOINT) 3259 addrconf_add_mroute(dev); 3260 } 3261 #endif 3262 3263 static int fixup_permanent_addr(struct inet6_dev *idev, 3264 struct inet6_ifaddr *ifp) 3265 { 3266 if (!ifp->rt) { 3267 struct rt6_info *rt; 3268 3269 rt = addrconf_dst_alloc(idev, &ifp->addr, false); 3270 if (unlikely(IS_ERR(rt))) 3271 return PTR_ERR(rt); 3272 3273 ifp->rt = rt; 3274 } 3275 3276 if (!(ifp->flags & IFA_F_NOPREFIXROUTE)) { 3277 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, 3278 idev->dev, 0, 0); 3279 } 3280 3281 addrconf_dad_start(ifp); 3282 3283 return 0; 3284 } 3285 3286 static void addrconf_permanent_addr(struct net_device *dev) 3287 { 3288 struct inet6_ifaddr *ifp, *tmp; 3289 struct inet6_dev *idev; 3290 3291 idev = __in6_dev_get(dev); 3292 if (!idev) 3293 return; 3294 3295 write_lock_bh(&idev->lock); 3296 3297 list_for_each_entry_safe(ifp, tmp, &idev->addr_list, if_list) { 3298 if ((ifp->flags & IFA_F_PERMANENT) && 3299 fixup_permanent_addr(idev, ifp) < 0) { 3300 write_unlock_bh(&idev->lock); 3301 ipv6_del_addr(ifp); 3302 write_lock_bh(&idev->lock); 3303 3304 net_info_ratelimited("%s: Failed to add prefix route for address %pI6c; dropping\n", 3305 idev->dev->name, &ifp->addr); 3306 } 3307 } 3308 3309 write_unlock_bh(&idev->lock); 3310 } 3311 3312 static int addrconf_notify(struct notifier_block *this, unsigned long event, 3313 void *ptr) 3314 { 3315 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 3316 struct netdev_notifier_changeupper_info *info; 3317 struct inet6_dev *idev = __in6_dev_get(dev); 3318 int run_pending = 0; 3319 int err; 3320 3321 switch (event) { 3322 case NETDEV_REGISTER: 3323 if (!idev && dev->mtu >= IPV6_MIN_MTU) { 3324 idev = ipv6_add_dev(dev); 3325 if (IS_ERR(idev)) 3326 return notifier_from_errno(PTR_ERR(idev)); 3327 } 3328 break; 3329 3330 case NETDEV_CHANGEMTU: 3331 /* if MTU under IPV6_MIN_MTU stop IPv6 on this interface. */ 3332 if (dev->mtu < IPV6_MIN_MTU) { 3333 addrconf_ifdown(dev, 1); 3334 break; 3335 } 3336 3337 if (idev) { 3338 rt6_mtu_change(dev, dev->mtu); 3339 idev->cnf.mtu6 = dev->mtu; 3340 break; 3341 } 3342 3343 /* allocate new idev */ 3344 idev = ipv6_add_dev(dev); 3345 if (IS_ERR(idev)) 3346 break; 3347 3348 /* device is still not ready */ 3349 if (!(idev->if_flags & IF_READY)) 3350 break; 3351 3352 run_pending = 1; 3353 3354 /* fall through */ 3355 3356 case NETDEV_UP: 3357 case NETDEV_CHANGE: 3358 if (dev->flags & IFF_SLAVE) 3359 break; 3360 3361 if (idev && idev->cnf.disable_ipv6) 3362 break; 3363 3364 if (event == NETDEV_UP) { 3365 /* restore routes for permanent addresses */ 3366 addrconf_permanent_addr(dev); 3367 3368 if (!addrconf_qdisc_ok(dev)) { 3369 /* device is not ready yet. */ 3370 pr_info("ADDRCONF(NETDEV_UP): %s: link is not ready\n", 3371 dev->name); 3372 break; 3373 } 3374 3375 if (!idev && dev->mtu >= IPV6_MIN_MTU) 3376 idev = ipv6_add_dev(dev); 3377 3378 if (!IS_ERR_OR_NULL(idev)) { 3379 idev->if_flags |= IF_READY; 3380 run_pending = 1; 3381 } 3382 } else if (event == NETDEV_CHANGE) { 3383 if (!addrconf_qdisc_ok(dev)) { 3384 /* device is still not ready. */ 3385 break; 3386 } 3387 3388 if (idev) { 3389 if (idev->if_flags & IF_READY) { 3390 /* device is already configured - 3391 * but resend MLD reports, we might 3392 * have roamed and need to update 3393 * multicast snooping switches 3394 */ 3395 ipv6_mc_up(idev); 3396 break; 3397 } 3398 idev->if_flags |= IF_READY; 3399 } 3400 3401 pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n", 3402 dev->name); 3403 3404 run_pending = 1; 3405 } 3406 3407 switch (dev->type) { 3408 #if IS_ENABLED(CONFIG_IPV6_SIT) 3409 case ARPHRD_SIT: 3410 addrconf_sit_config(dev); 3411 break; 3412 #endif 3413 #if IS_ENABLED(CONFIG_NET_IPGRE) 3414 case ARPHRD_IPGRE: 3415 addrconf_gre_config(dev); 3416 break; 3417 #endif 3418 case ARPHRD_LOOPBACK: 3419 init_loopback(dev); 3420 break; 3421 3422 default: 3423 addrconf_dev_config(dev); 3424 break; 3425 } 3426 3427 if (!IS_ERR_OR_NULL(idev)) { 3428 if (run_pending) 3429 addrconf_dad_run(idev); 3430 3431 /* 3432 * If the MTU changed during the interface down, 3433 * when the interface up, the changed MTU must be 3434 * reflected in the idev as well as routers. 3435 */ 3436 if (idev->cnf.mtu6 != dev->mtu && 3437 dev->mtu >= IPV6_MIN_MTU) { 3438 rt6_mtu_change(dev, dev->mtu); 3439 idev->cnf.mtu6 = dev->mtu; 3440 } 3441 idev->tstamp = jiffies; 3442 inet6_ifinfo_notify(RTM_NEWLINK, idev); 3443 3444 /* 3445 * If the changed mtu during down is lower than 3446 * IPV6_MIN_MTU stop IPv6 on this interface. 3447 */ 3448 if (dev->mtu < IPV6_MIN_MTU) 3449 addrconf_ifdown(dev, 1); 3450 } 3451 break; 3452 3453 case NETDEV_DOWN: 3454 case NETDEV_UNREGISTER: 3455 /* 3456 * Remove all addresses from this interface. 3457 */ 3458 addrconf_ifdown(dev, event != NETDEV_DOWN); 3459 break; 3460 3461 case NETDEV_CHANGENAME: 3462 if (idev) { 3463 snmp6_unregister_dev(idev); 3464 addrconf_sysctl_unregister(idev); 3465 err = addrconf_sysctl_register(idev); 3466 if (err) 3467 return notifier_from_errno(err); 3468 err = snmp6_register_dev(idev); 3469 if (err) { 3470 addrconf_sysctl_unregister(idev); 3471 return notifier_from_errno(err); 3472 } 3473 } 3474 break; 3475 3476 case NETDEV_PRE_TYPE_CHANGE: 3477 case NETDEV_POST_TYPE_CHANGE: 3478 if (idev) 3479 addrconf_type_change(dev, event); 3480 break; 3481 3482 case NETDEV_CHANGEUPPER: 3483 info = ptr; 3484 3485 /* flush all routes if dev is linked to or unlinked from 3486 * an L3 master device (e.g., VRF) 3487 */ 3488 if (info->upper_dev && netif_is_l3_master(info->upper_dev)) 3489 addrconf_ifdown(dev, 0); 3490 } 3491 3492 return NOTIFY_OK; 3493 } 3494 3495 /* 3496 * addrconf module should be notified of a device going up 3497 */ 3498 static struct notifier_block ipv6_dev_notf = { 3499 .notifier_call = addrconf_notify, 3500 }; 3501 3502 static void addrconf_type_change(struct net_device *dev, unsigned long event) 3503 { 3504 struct inet6_dev *idev; 3505 ASSERT_RTNL(); 3506 3507 idev = __in6_dev_get(dev); 3508 3509 if (event == NETDEV_POST_TYPE_CHANGE) 3510 ipv6_mc_remap(idev); 3511 else if (event == NETDEV_PRE_TYPE_CHANGE) 3512 ipv6_mc_unmap(idev); 3513 } 3514 3515 static bool addr_is_local(const struct in6_addr *addr) 3516 { 3517 return ipv6_addr_type(addr) & 3518 (IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK); 3519 } 3520 3521 static int addrconf_ifdown(struct net_device *dev, int how) 3522 { 3523 struct net *net = dev_net(dev); 3524 struct inet6_dev *idev; 3525 struct inet6_ifaddr *ifa, *tmp; 3526 struct list_head del_list; 3527 int _keep_addr; 3528 bool keep_addr; 3529 int state, i; 3530 3531 ASSERT_RTNL(); 3532 3533 rt6_ifdown(net, dev); 3534 neigh_ifdown(&nd_tbl, dev); 3535 3536 idev = __in6_dev_get(dev); 3537 if (!idev) 3538 return -ENODEV; 3539 3540 /* 3541 * Step 1: remove reference to ipv6 device from parent device. 3542 * Do not dev_put! 3543 */ 3544 if (how) { 3545 idev->dead = 1; 3546 3547 /* protected by rtnl_lock */ 3548 RCU_INIT_POINTER(dev->ip6_ptr, NULL); 3549 3550 /* Step 1.5: remove snmp6 entry */ 3551 snmp6_unregister_dev(idev); 3552 3553 } 3554 3555 /* aggregate the system setting and interface setting */ 3556 _keep_addr = net->ipv6.devconf_all->keep_addr_on_down; 3557 if (!_keep_addr) 3558 _keep_addr = idev->cnf.keep_addr_on_down; 3559 3560 /* combine the user config with event to determine if permanent 3561 * addresses are to be removed from address hash table 3562 */ 3563 keep_addr = !(how || _keep_addr <= 0 || idev->cnf.disable_ipv6); 3564 3565 /* Step 2: clear hash table */ 3566 for (i = 0; i < IN6_ADDR_HSIZE; i++) { 3567 struct hlist_head *h = &inet6_addr_lst[i]; 3568 3569 spin_lock_bh(&addrconf_hash_lock); 3570 restart: 3571 hlist_for_each_entry_rcu(ifa, h, addr_lst) { 3572 if (ifa->idev == idev) { 3573 addrconf_del_dad_work(ifa); 3574 /* combined flag + permanent flag decide if 3575 * address is retained on a down event 3576 */ 3577 if (!keep_addr || 3578 !(ifa->flags & IFA_F_PERMANENT) || 3579 addr_is_local(&ifa->addr)) { 3580 hlist_del_init_rcu(&ifa->addr_lst); 3581 goto restart; 3582 } 3583 } 3584 } 3585 spin_unlock_bh(&addrconf_hash_lock); 3586 } 3587 3588 write_lock_bh(&idev->lock); 3589 3590 addrconf_del_rs_timer(idev); 3591 3592 /* Step 2: clear flags for stateless addrconf */ 3593 if (!how) 3594 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY); 3595 3596 /* Step 3: clear tempaddr list */ 3597 while (!list_empty(&idev->tempaddr_list)) { 3598 ifa = list_first_entry(&idev->tempaddr_list, 3599 struct inet6_ifaddr, tmp_list); 3600 list_del(&ifa->tmp_list); 3601 write_unlock_bh(&idev->lock); 3602 spin_lock_bh(&ifa->lock); 3603 3604 if (ifa->ifpub) { 3605 in6_ifa_put(ifa->ifpub); 3606 ifa->ifpub = NULL; 3607 } 3608 spin_unlock_bh(&ifa->lock); 3609 in6_ifa_put(ifa); 3610 write_lock_bh(&idev->lock); 3611 } 3612 3613 /* re-combine the user config with event to determine if permanent 3614 * addresses are to be removed from the interface list 3615 */ 3616 keep_addr = (!how && _keep_addr > 0 && !idev->cnf.disable_ipv6); 3617 3618 INIT_LIST_HEAD(&del_list); 3619 list_for_each_entry_safe(ifa, tmp, &idev->addr_list, if_list) { 3620 struct rt6_info *rt = NULL; 3621 3622 addrconf_del_dad_work(ifa); 3623 3624 write_unlock_bh(&idev->lock); 3625 spin_lock_bh(&ifa->lock); 3626 3627 if (keep_addr && (ifa->flags & IFA_F_PERMANENT) && 3628 !addr_is_local(&ifa->addr)) { 3629 /* set state to skip the notifier below */ 3630 state = INET6_IFADDR_STATE_DEAD; 3631 ifa->state = 0; 3632 if (!(ifa->flags & IFA_F_NODAD)) 3633 ifa->flags |= IFA_F_TENTATIVE; 3634 3635 rt = ifa->rt; 3636 ifa->rt = NULL; 3637 } else { 3638 state = ifa->state; 3639 ifa->state = INET6_IFADDR_STATE_DEAD; 3640 3641 list_move(&ifa->if_list, &del_list); 3642 } 3643 3644 spin_unlock_bh(&ifa->lock); 3645 3646 if (rt) 3647 ip6_del_rt(rt); 3648 3649 if (state != INET6_IFADDR_STATE_DEAD) { 3650 __ipv6_ifa_notify(RTM_DELADDR, ifa); 3651 inet6addr_notifier_call_chain(NETDEV_DOWN, ifa); 3652 } else { 3653 if (idev->cnf.forwarding) 3654 addrconf_leave_anycast(ifa); 3655 addrconf_leave_solict(ifa->idev, &ifa->addr); 3656 } 3657 3658 write_lock_bh(&idev->lock); 3659 } 3660 3661 write_unlock_bh(&idev->lock); 3662 3663 /* now clean up addresses to be removed */ 3664 while (!list_empty(&del_list)) { 3665 ifa = list_first_entry(&del_list, 3666 struct inet6_ifaddr, if_list); 3667 list_del(&ifa->if_list); 3668 3669 in6_ifa_put(ifa); 3670 } 3671 3672 /* Step 5: Discard anycast and multicast list */ 3673 if (how) { 3674 ipv6_ac_destroy_dev(idev); 3675 ipv6_mc_destroy_dev(idev); 3676 } else { 3677 ipv6_mc_down(idev); 3678 } 3679 3680 idev->tstamp = jiffies; 3681 3682 /* Last: Shot the device (if unregistered) */ 3683 if (how) { 3684 addrconf_sysctl_unregister(idev); 3685 neigh_parms_release(&nd_tbl, idev->nd_parms); 3686 neigh_ifdown(&nd_tbl, dev); 3687 in6_dev_put(idev); 3688 } 3689 return 0; 3690 } 3691 3692 static void addrconf_rs_timer(unsigned long data) 3693 { 3694 struct inet6_dev *idev = (struct inet6_dev *)data; 3695 struct net_device *dev = idev->dev; 3696 struct in6_addr lladdr; 3697 3698 write_lock(&idev->lock); 3699 if (idev->dead || !(idev->if_flags & IF_READY)) 3700 goto out; 3701 3702 if (!ipv6_accept_ra(idev)) 3703 goto out; 3704 3705 /* Announcement received after solicitation was sent */ 3706 if (idev->if_flags & IF_RA_RCVD) 3707 goto out; 3708 3709 if (idev->rs_probes++ < idev->cnf.rtr_solicits || idev->cnf.rtr_solicits < 0) { 3710 write_unlock(&idev->lock); 3711 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE)) 3712 ndisc_send_rs(dev, &lladdr, 3713 &in6addr_linklocal_allrouters); 3714 else 3715 goto put; 3716 3717 write_lock(&idev->lock); 3718 idev->rs_interval = rfc3315_s14_backoff_update( 3719 idev->rs_interval, idev->cnf.rtr_solicit_max_interval); 3720 /* The wait after the last probe can be shorter */ 3721 addrconf_mod_rs_timer(idev, (idev->rs_probes == 3722 idev->cnf.rtr_solicits) ? 3723 idev->cnf.rtr_solicit_delay : 3724 idev->rs_interval); 3725 } else { 3726 /* 3727 * Note: we do not support deprecated "all on-link" 3728 * assumption any longer. 3729 */ 3730 pr_debug("%s: no IPv6 routers present\n", idev->dev->name); 3731 } 3732 3733 out: 3734 write_unlock(&idev->lock); 3735 put: 3736 in6_dev_put(idev); 3737 } 3738 3739 /* 3740 * Duplicate Address Detection 3741 */ 3742 static void addrconf_dad_kick(struct inet6_ifaddr *ifp) 3743 { 3744 unsigned long rand_num; 3745 struct inet6_dev *idev = ifp->idev; 3746 u64 nonce; 3747 3748 if (ifp->flags & IFA_F_OPTIMISTIC) 3749 rand_num = 0; 3750 else 3751 rand_num = prandom_u32() % (idev->cnf.rtr_solicit_delay ? : 1); 3752 3753 nonce = 0; 3754 if (idev->cnf.enhanced_dad || 3755 dev_net(idev->dev)->ipv6.devconf_all->enhanced_dad) { 3756 do 3757 get_random_bytes(&nonce, 6); 3758 while (nonce == 0); 3759 } 3760 ifp->dad_nonce = nonce; 3761 ifp->dad_probes = idev->cnf.dad_transmits; 3762 addrconf_mod_dad_work(ifp, rand_num); 3763 } 3764 3765 static void addrconf_dad_begin(struct inet6_ifaddr *ifp) 3766 { 3767 struct inet6_dev *idev = ifp->idev; 3768 struct net_device *dev = idev->dev; 3769 bool bump_id, notify = false; 3770 3771 addrconf_join_solict(dev, &ifp->addr); 3772 3773 prandom_seed((__force u32) ifp->addr.s6_addr32[3]); 3774 3775 read_lock_bh(&idev->lock); 3776 spin_lock(&ifp->lock); 3777 if (ifp->state == INET6_IFADDR_STATE_DEAD) 3778 goto out; 3779 3780 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) || 3781 idev->cnf.accept_dad < 1 || 3782 !(ifp->flags&IFA_F_TENTATIVE) || 3783 ifp->flags & IFA_F_NODAD) { 3784 bump_id = ifp->flags & IFA_F_TENTATIVE; 3785 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED); 3786 spin_unlock(&ifp->lock); 3787 read_unlock_bh(&idev->lock); 3788 3789 addrconf_dad_completed(ifp, bump_id); 3790 return; 3791 } 3792 3793 if (!(idev->if_flags & IF_READY)) { 3794 spin_unlock(&ifp->lock); 3795 read_unlock_bh(&idev->lock); 3796 /* 3797 * If the device is not ready: 3798 * - keep it tentative if it is a permanent address. 3799 * - otherwise, kill it. 3800 */ 3801 in6_ifa_hold(ifp); 3802 addrconf_dad_stop(ifp, 0); 3803 return; 3804 } 3805 3806 /* 3807 * Optimistic nodes can start receiving 3808 * Frames right away 3809 */ 3810 if (ifp->flags & IFA_F_OPTIMISTIC) { 3811 ip6_ins_rt(ifp->rt); 3812 if (ipv6_use_optimistic_addr(idev)) { 3813 /* Because optimistic nodes can use this address, 3814 * notify listeners. If DAD fails, RTM_DELADDR is sent. 3815 */ 3816 notify = true; 3817 } 3818 } 3819 3820 addrconf_dad_kick(ifp); 3821 out: 3822 spin_unlock(&ifp->lock); 3823 read_unlock_bh(&idev->lock); 3824 if (notify) 3825 ipv6_ifa_notify(RTM_NEWADDR, ifp); 3826 } 3827 3828 static void addrconf_dad_start(struct inet6_ifaddr *ifp) 3829 { 3830 bool begin_dad = false; 3831 3832 spin_lock_bh(&ifp->lock); 3833 if (ifp->state != INET6_IFADDR_STATE_DEAD) { 3834 ifp->state = INET6_IFADDR_STATE_PREDAD; 3835 begin_dad = true; 3836 } 3837 spin_unlock_bh(&ifp->lock); 3838 3839 if (begin_dad) 3840 addrconf_mod_dad_work(ifp, 0); 3841 } 3842 3843 static void addrconf_dad_work(struct work_struct *w) 3844 { 3845 struct inet6_ifaddr *ifp = container_of(to_delayed_work(w), 3846 struct inet6_ifaddr, 3847 dad_work); 3848 struct inet6_dev *idev = ifp->idev; 3849 bool bump_id, disable_ipv6 = false; 3850 struct in6_addr mcaddr; 3851 3852 enum { 3853 DAD_PROCESS, 3854 DAD_BEGIN, 3855 DAD_ABORT, 3856 } action = DAD_PROCESS; 3857 3858 rtnl_lock(); 3859 3860 spin_lock_bh(&ifp->lock); 3861 if (ifp->state == INET6_IFADDR_STATE_PREDAD) { 3862 action = DAD_BEGIN; 3863 ifp->state = INET6_IFADDR_STATE_DAD; 3864 } else if (ifp->state == INET6_IFADDR_STATE_ERRDAD) { 3865 action = DAD_ABORT; 3866 ifp->state = INET6_IFADDR_STATE_POSTDAD; 3867 3868 if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6 && 3869 !(ifp->flags & IFA_F_STABLE_PRIVACY)) { 3870 struct in6_addr addr; 3871 3872 addr.s6_addr32[0] = htonl(0xfe800000); 3873 addr.s6_addr32[1] = 0; 3874 3875 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) && 3876 ipv6_addr_equal(&ifp->addr, &addr)) { 3877 /* DAD failed for link-local based on MAC */ 3878 idev->cnf.disable_ipv6 = 1; 3879 3880 pr_info("%s: IPv6 being disabled!\n", 3881 ifp->idev->dev->name); 3882 disable_ipv6 = true; 3883 } 3884 } 3885 } 3886 spin_unlock_bh(&ifp->lock); 3887 3888 if (action == DAD_BEGIN) { 3889 addrconf_dad_begin(ifp); 3890 goto out; 3891 } else if (action == DAD_ABORT) { 3892 in6_ifa_hold(ifp); 3893 addrconf_dad_stop(ifp, 1); 3894 if (disable_ipv6) 3895 addrconf_ifdown(idev->dev, 0); 3896 goto out; 3897 } 3898 3899 if (!ifp->dad_probes && addrconf_dad_end(ifp)) 3900 goto out; 3901 3902 write_lock_bh(&idev->lock); 3903 if (idev->dead || !(idev->if_flags & IF_READY)) { 3904 write_unlock_bh(&idev->lock); 3905 goto out; 3906 } 3907 3908 spin_lock(&ifp->lock); 3909 if (ifp->state == INET6_IFADDR_STATE_DEAD) { 3910 spin_unlock(&ifp->lock); 3911 write_unlock_bh(&idev->lock); 3912 goto out; 3913 } 3914 3915 if (ifp->dad_probes == 0) { 3916 /* 3917 * DAD was successful 3918 */ 3919 3920 bump_id = ifp->flags & IFA_F_TENTATIVE; 3921 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED); 3922 spin_unlock(&ifp->lock); 3923 write_unlock_bh(&idev->lock); 3924 3925 addrconf_dad_completed(ifp, bump_id); 3926 3927 goto out; 3928 } 3929 3930 ifp->dad_probes--; 3931 addrconf_mod_dad_work(ifp, 3932 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME)); 3933 spin_unlock(&ifp->lock); 3934 write_unlock_bh(&idev->lock); 3935 3936 /* send a neighbour solicitation for our addr */ 3937 addrconf_addr_solict_mult(&ifp->addr, &mcaddr); 3938 ndisc_send_ns(ifp->idev->dev, &ifp->addr, &mcaddr, &in6addr_any, 3939 ifp->dad_nonce); 3940 out: 3941 in6_ifa_put(ifp); 3942 rtnl_unlock(); 3943 } 3944 3945 /* ifp->idev must be at least read locked */ 3946 static bool ipv6_lonely_lladdr(struct inet6_ifaddr *ifp) 3947 { 3948 struct inet6_ifaddr *ifpiter; 3949 struct inet6_dev *idev = ifp->idev; 3950 3951 list_for_each_entry_reverse(ifpiter, &idev->addr_list, if_list) { 3952 if (ifpiter->scope > IFA_LINK) 3953 break; 3954 if (ifp != ifpiter && ifpiter->scope == IFA_LINK && 3955 (ifpiter->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE| 3956 IFA_F_OPTIMISTIC|IFA_F_DADFAILED)) == 3957 IFA_F_PERMANENT) 3958 return false; 3959 } 3960 return true; 3961 } 3962 3963 static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id) 3964 { 3965 struct net_device *dev = ifp->idev->dev; 3966 struct in6_addr lladdr; 3967 bool send_rs, send_mld; 3968 3969 addrconf_del_dad_work(ifp); 3970 3971 /* 3972 * Configure the address for reception. Now it is valid. 3973 */ 3974 3975 ipv6_ifa_notify(RTM_NEWADDR, ifp); 3976 3977 /* If added prefix is link local and we are prepared to process 3978 router advertisements, start sending router solicitations. 3979 */ 3980 3981 read_lock_bh(&ifp->idev->lock); 3982 send_mld = ifp->scope == IFA_LINK && ipv6_lonely_lladdr(ifp); 3983 send_rs = send_mld && 3984 ipv6_accept_ra(ifp->idev) && 3985 ifp->idev->cnf.rtr_solicits != 0 && 3986 (dev->flags&IFF_LOOPBACK) == 0; 3987 read_unlock_bh(&ifp->idev->lock); 3988 3989 /* While dad is in progress mld report's source address is in6_addrany. 3990 * Resend with proper ll now. 3991 */ 3992 if (send_mld) 3993 ipv6_mc_dad_complete(ifp->idev); 3994 3995 if (send_rs) { 3996 /* 3997 * If a host as already performed a random delay 3998 * [...] as part of DAD [...] there is no need 3999 * to delay again before sending the first RS 4000 */ 4001 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE)) 4002 return; 4003 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters); 4004 4005 write_lock_bh(&ifp->idev->lock); 4006 spin_lock(&ifp->lock); 4007 ifp->idev->rs_interval = rfc3315_s14_backoff_init( 4008 ifp->idev->cnf.rtr_solicit_interval); 4009 ifp->idev->rs_probes = 1; 4010 ifp->idev->if_flags |= IF_RS_SENT; 4011 addrconf_mod_rs_timer(ifp->idev, ifp->idev->rs_interval); 4012 spin_unlock(&ifp->lock); 4013 write_unlock_bh(&ifp->idev->lock); 4014 } 4015 4016 if (bump_id) 4017 rt_genid_bump_ipv6(dev_net(dev)); 4018 4019 /* Make sure that a new temporary address will be created 4020 * before this temporary address becomes deprecated. 4021 */ 4022 if (ifp->flags & IFA_F_TEMPORARY) 4023 addrconf_verify_rtnl(); 4024 } 4025 4026 static void addrconf_dad_run(struct inet6_dev *idev) 4027 { 4028 struct inet6_ifaddr *ifp; 4029 4030 read_lock_bh(&idev->lock); 4031 list_for_each_entry(ifp, &idev->addr_list, if_list) { 4032 spin_lock(&ifp->lock); 4033 if (ifp->flags & IFA_F_TENTATIVE && 4034 ifp->state == INET6_IFADDR_STATE_DAD) 4035 addrconf_dad_kick(ifp); 4036 spin_unlock(&ifp->lock); 4037 } 4038 read_unlock_bh(&idev->lock); 4039 } 4040 4041 #ifdef CONFIG_PROC_FS 4042 struct if6_iter_state { 4043 struct seq_net_private p; 4044 int bucket; 4045 int offset; 4046 }; 4047 4048 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos) 4049 { 4050 struct inet6_ifaddr *ifa = NULL; 4051 struct if6_iter_state *state = seq->private; 4052 struct net *net = seq_file_net(seq); 4053 int p = 0; 4054 4055 /* initial bucket if pos is 0 */ 4056 if (pos == 0) { 4057 state->bucket = 0; 4058 state->offset = 0; 4059 } 4060 4061 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) { 4062 hlist_for_each_entry_rcu_bh(ifa, &inet6_addr_lst[state->bucket], 4063 addr_lst) { 4064 if (!net_eq(dev_net(ifa->idev->dev), net)) 4065 continue; 4066 /* sync with offset */ 4067 if (p < state->offset) { 4068 p++; 4069 continue; 4070 } 4071 state->offset++; 4072 return ifa; 4073 } 4074 4075 /* prepare for next bucket */ 4076 state->offset = 0; 4077 p = 0; 4078 } 4079 return NULL; 4080 } 4081 4082 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, 4083 struct inet6_ifaddr *ifa) 4084 { 4085 struct if6_iter_state *state = seq->private; 4086 struct net *net = seq_file_net(seq); 4087 4088 hlist_for_each_entry_continue_rcu_bh(ifa, addr_lst) { 4089 if (!net_eq(dev_net(ifa->idev->dev), net)) 4090 continue; 4091 state->offset++; 4092 return ifa; 4093 } 4094 4095 while (++state->bucket < IN6_ADDR_HSIZE) { 4096 state->offset = 0; 4097 hlist_for_each_entry_rcu_bh(ifa, 4098 &inet6_addr_lst[state->bucket], addr_lst) { 4099 if (!net_eq(dev_net(ifa->idev->dev), net)) 4100 continue; 4101 state->offset++; 4102 return ifa; 4103 } 4104 } 4105 4106 return NULL; 4107 } 4108 4109 static void *if6_seq_start(struct seq_file *seq, loff_t *pos) 4110 __acquires(rcu_bh) 4111 { 4112 rcu_read_lock_bh(); 4113 return if6_get_first(seq, *pos); 4114 } 4115 4116 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos) 4117 { 4118 struct inet6_ifaddr *ifa; 4119 4120 ifa = if6_get_next(seq, v); 4121 ++*pos; 4122 return ifa; 4123 } 4124 4125 static void if6_seq_stop(struct seq_file *seq, void *v) 4126 __releases(rcu_bh) 4127 { 4128 rcu_read_unlock_bh(); 4129 } 4130 4131 static int if6_seq_show(struct seq_file *seq, void *v) 4132 { 4133 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v; 4134 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n", 4135 &ifp->addr, 4136 ifp->idev->dev->ifindex, 4137 ifp->prefix_len, 4138 ifp->scope, 4139 (u8) ifp->flags, 4140 ifp->idev->dev->name); 4141 return 0; 4142 } 4143 4144 static const struct seq_operations if6_seq_ops = { 4145 .start = if6_seq_start, 4146 .next = if6_seq_next, 4147 .show = if6_seq_show, 4148 .stop = if6_seq_stop, 4149 }; 4150 4151 static int if6_seq_open(struct inode *inode, struct file *file) 4152 { 4153 return seq_open_net(inode, file, &if6_seq_ops, 4154 sizeof(struct if6_iter_state)); 4155 } 4156 4157 static const struct file_operations if6_fops = { 4158 .owner = THIS_MODULE, 4159 .open = if6_seq_open, 4160 .read = seq_read, 4161 .llseek = seq_lseek, 4162 .release = seq_release_net, 4163 }; 4164 4165 static int __net_init if6_proc_net_init(struct net *net) 4166 { 4167 if (!proc_create("if_inet6", S_IRUGO, net->proc_net, &if6_fops)) 4168 return -ENOMEM; 4169 return 0; 4170 } 4171 4172 static void __net_exit if6_proc_net_exit(struct net *net) 4173 { 4174 remove_proc_entry("if_inet6", net->proc_net); 4175 } 4176 4177 static struct pernet_operations if6_proc_net_ops = { 4178 .init = if6_proc_net_init, 4179 .exit = if6_proc_net_exit, 4180 }; 4181 4182 int __init if6_proc_init(void) 4183 { 4184 return register_pernet_subsys(&if6_proc_net_ops); 4185 } 4186 4187 void if6_proc_exit(void) 4188 { 4189 unregister_pernet_subsys(&if6_proc_net_ops); 4190 } 4191 #endif /* CONFIG_PROC_FS */ 4192 4193 #if IS_ENABLED(CONFIG_IPV6_MIP6) 4194 /* Check if address is a home address configured on any interface. */ 4195 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr) 4196 { 4197 int ret = 0; 4198 struct inet6_ifaddr *ifp = NULL; 4199 unsigned int hash = inet6_addr_hash(addr); 4200 4201 rcu_read_lock_bh(); 4202 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) { 4203 if (!net_eq(dev_net(ifp->idev->dev), net)) 4204 continue; 4205 if (ipv6_addr_equal(&ifp->addr, addr) && 4206 (ifp->flags & IFA_F_HOMEADDRESS)) { 4207 ret = 1; 4208 break; 4209 } 4210 } 4211 rcu_read_unlock_bh(); 4212 return ret; 4213 } 4214 #endif 4215 4216 /* 4217 * Periodic address status verification 4218 */ 4219 4220 static void addrconf_verify_rtnl(void) 4221 { 4222 unsigned long now, next, next_sec, next_sched; 4223 struct inet6_ifaddr *ifp; 4224 int i; 4225 4226 ASSERT_RTNL(); 4227 4228 rcu_read_lock_bh(); 4229 now = jiffies; 4230 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY); 4231 4232 cancel_delayed_work(&addr_chk_work); 4233 4234 for (i = 0; i < IN6_ADDR_HSIZE; i++) { 4235 restart: 4236 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[i], addr_lst) { 4237 unsigned long age; 4238 4239 /* When setting preferred_lft to a value not zero or 4240 * infinity, while valid_lft is infinity 4241 * IFA_F_PERMANENT has a non-infinity life time. 4242 */ 4243 if ((ifp->flags & IFA_F_PERMANENT) && 4244 (ifp->prefered_lft == INFINITY_LIFE_TIME)) 4245 continue; 4246 4247 spin_lock(&ifp->lock); 4248 /* We try to batch several events at once. */ 4249 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ; 4250 4251 if (ifp->valid_lft != INFINITY_LIFE_TIME && 4252 age >= ifp->valid_lft) { 4253 spin_unlock(&ifp->lock); 4254 in6_ifa_hold(ifp); 4255 ipv6_del_addr(ifp); 4256 goto restart; 4257 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) { 4258 spin_unlock(&ifp->lock); 4259 continue; 4260 } else if (age >= ifp->prefered_lft) { 4261 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */ 4262 int deprecate = 0; 4263 4264 if (!(ifp->flags&IFA_F_DEPRECATED)) { 4265 deprecate = 1; 4266 ifp->flags |= IFA_F_DEPRECATED; 4267 } 4268 4269 if ((ifp->valid_lft != INFINITY_LIFE_TIME) && 4270 (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))) 4271 next = ifp->tstamp + ifp->valid_lft * HZ; 4272 4273 spin_unlock(&ifp->lock); 4274 4275 if (deprecate) { 4276 in6_ifa_hold(ifp); 4277 4278 ipv6_ifa_notify(0, ifp); 4279 in6_ifa_put(ifp); 4280 goto restart; 4281 } 4282 } else if ((ifp->flags&IFA_F_TEMPORARY) && 4283 !(ifp->flags&IFA_F_TENTATIVE)) { 4284 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry * 4285 ifp->idev->cnf.dad_transmits * 4286 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME) / HZ; 4287 4288 if (age >= ifp->prefered_lft - regen_advance) { 4289 struct inet6_ifaddr *ifpub = ifp->ifpub; 4290 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 4291 next = ifp->tstamp + ifp->prefered_lft * HZ; 4292 if (!ifp->regen_count && ifpub) { 4293 ifp->regen_count++; 4294 in6_ifa_hold(ifp); 4295 in6_ifa_hold(ifpub); 4296 spin_unlock(&ifp->lock); 4297 4298 spin_lock(&ifpub->lock); 4299 ifpub->regen_count = 0; 4300 spin_unlock(&ifpub->lock); 4301 ipv6_create_tempaddr(ifpub, ifp); 4302 in6_ifa_put(ifpub); 4303 in6_ifa_put(ifp); 4304 goto restart; 4305 } 4306 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next)) 4307 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ; 4308 spin_unlock(&ifp->lock); 4309 } else { 4310 /* ifp->prefered_lft <= ifp->valid_lft */ 4311 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 4312 next = ifp->tstamp + ifp->prefered_lft * HZ; 4313 spin_unlock(&ifp->lock); 4314 } 4315 } 4316 } 4317 4318 next_sec = round_jiffies_up(next); 4319 next_sched = next; 4320 4321 /* If rounded timeout is accurate enough, accept it. */ 4322 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ)) 4323 next_sched = next_sec; 4324 4325 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */ 4326 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX)) 4327 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX; 4328 4329 ADBG(KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n", 4330 now, next, next_sec, next_sched); 4331 mod_delayed_work(addrconf_wq, &addr_chk_work, next_sched - now); 4332 rcu_read_unlock_bh(); 4333 } 4334 4335 static void addrconf_verify_work(struct work_struct *w) 4336 { 4337 rtnl_lock(); 4338 addrconf_verify_rtnl(); 4339 rtnl_unlock(); 4340 } 4341 4342 static void addrconf_verify(void) 4343 { 4344 mod_delayed_work(addrconf_wq, &addr_chk_work, 0); 4345 } 4346 4347 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local, 4348 struct in6_addr **peer_pfx) 4349 { 4350 struct in6_addr *pfx = NULL; 4351 4352 *peer_pfx = NULL; 4353 4354 if (addr) 4355 pfx = nla_data(addr); 4356 4357 if (local) { 4358 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx))) 4359 *peer_pfx = pfx; 4360 pfx = nla_data(local); 4361 } 4362 4363 return pfx; 4364 } 4365 4366 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = { 4367 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) }, 4368 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) }, 4369 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) }, 4370 [IFA_FLAGS] = { .len = sizeof(u32) }, 4371 }; 4372 4373 static int 4374 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh) 4375 { 4376 struct net *net = sock_net(skb->sk); 4377 struct ifaddrmsg *ifm; 4378 struct nlattr *tb[IFA_MAX+1]; 4379 struct in6_addr *pfx, *peer_pfx; 4380 u32 ifa_flags; 4381 int err; 4382 4383 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy); 4384 if (err < 0) 4385 return err; 4386 4387 ifm = nlmsg_data(nlh); 4388 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx); 4389 if (!pfx) 4390 return -EINVAL; 4391 4392 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags; 4393 4394 /* We ignore other flags so far. */ 4395 ifa_flags &= IFA_F_MANAGETEMPADDR; 4396 4397 return inet6_addr_del(net, ifm->ifa_index, ifa_flags, pfx, 4398 ifm->ifa_prefixlen); 4399 } 4400 4401 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u32 ifa_flags, 4402 u32 prefered_lft, u32 valid_lft) 4403 { 4404 u32 flags; 4405 clock_t expires; 4406 unsigned long timeout; 4407 bool was_managetempaddr; 4408 bool had_prefixroute; 4409 4410 ASSERT_RTNL(); 4411 4412 if (!valid_lft || (prefered_lft > valid_lft)) 4413 return -EINVAL; 4414 4415 if (ifa_flags & IFA_F_MANAGETEMPADDR && 4416 (ifp->flags & IFA_F_TEMPORARY || ifp->prefix_len != 64)) 4417 return -EINVAL; 4418 4419 timeout = addrconf_timeout_fixup(valid_lft, HZ); 4420 if (addrconf_finite_timeout(timeout)) { 4421 expires = jiffies_to_clock_t(timeout * HZ); 4422 valid_lft = timeout; 4423 flags = RTF_EXPIRES; 4424 } else { 4425 expires = 0; 4426 flags = 0; 4427 ifa_flags |= IFA_F_PERMANENT; 4428 } 4429 4430 timeout = addrconf_timeout_fixup(prefered_lft, HZ); 4431 if (addrconf_finite_timeout(timeout)) { 4432 if (timeout == 0) 4433 ifa_flags |= IFA_F_DEPRECATED; 4434 prefered_lft = timeout; 4435 } 4436 4437 spin_lock_bh(&ifp->lock); 4438 was_managetempaddr = ifp->flags & IFA_F_MANAGETEMPADDR; 4439 had_prefixroute = ifp->flags & IFA_F_PERMANENT && 4440 !(ifp->flags & IFA_F_NOPREFIXROUTE); 4441 ifp->flags &= ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | 4442 IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR | 4443 IFA_F_NOPREFIXROUTE); 4444 ifp->flags |= ifa_flags; 4445 ifp->tstamp = jiffies; 4446 ifp->valid_lft = valid_lft; 4447 ifp->prefered_lft = prefered_lft; 4448 4449 spin_unlock_bh(&ifp->lock); 4450 if (!(ifp->flags&IFA_F_TENTATIVE)) 4451 ipv6_ifa_notify(0, ifp); 4452 4453 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) { 4454 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev, 4455 expires, flags); 4456 } else if (had_prefixroute) { 4457 enum cleanup_prefix_rt_t action; 4458 unsigned long rt_expires; 4459 4460 write_lock_bh(&ifp->idev->lock); 4461 action = check_cleanup_prefix_route(ifp, &rt_expires); 4462 write_unlock_bh(&ifp->idev->lock); 4463 4464 if (action != CLEANUP_PREFIX_RT_NOP) { 4465 cleanup_prefix_route(ifp, rt_expires, 4466 action == CLEANUP_PREFIX_RT_DEL); 4467 } 4468 } 4469 4470 if (was_managetempaddr || ifp->flags & IFA_F_MANAGETEMPADDR) { 4471 if (was_managetempaddr && !(ifp->flags & IFA_F_MANAGETEMPADDR)) 4472 valid_lft = prefered_lft = 0; 4473 manage_tempaddrs(ifp->idev, ifp, valid_lft, prefered_lft, 4474 !was_managetempaddr, jiffies); 4475 } 4476 4477 addrconf_verify_rtnl(); 4478 4479 return 0; 4480 } 4481 4482 static int 4483 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh) 4484 { 4485 struct net *net = sock_net(skb->sk); 4486 struct ifaddrmsg *ifm; 4487 struct nlattr *tb[IFA_MAX+1]; 4488 struct in6_addr *pfx, *peer_pfx; 4489 struct inet6_ifaddr *ifa; 4490 struct net_device *dev; 4491 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME; 4492 u32 ifa_flags; 4493 int err; 4494 4495 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy); 4496 if (err < 0) 4497 return err; 4498 4499 ifm = nlmsg_data(nlh); 4500 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx); 4501 if (!pfx) 4502 return -EINVAL; 4503 4504 if (tb[IFA_CACHEINFO]) { 4505 struct ifa_cacheinfo *ci; 4506 4507 ci = nla_data(tb[IFA_CACHEINFO]); 4508 valid_lft = ci->ifa_valid; 4509 preferred_lft = ci->ifa_prefered; 4510 } else { 4511 preferred_lft = INFINITY_LIFE_TIME; 4512 valid_lft = INFINITY_LIFE_TIME; 4513 } 4514 4515 dev = __dev_get_by_index(net, ifm->ifa_index); 4516 if (!dev) 4517 return -ENODEV; 4518 4519 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags; 4520 4521 /* We ignore other flags so far. */ 4522 ifa_flags &= IFA_F_NODAD | IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR | 4523 IFA_F_NOPREFIXROUTE | IFA_F_MCAUTOJOIN; 4524 4525 ifa = ipv6_get_ifaddr(net, pfx, dev, 1); 4526 if (!ifa) { 4527 /* 4528 * It would be best to check for !NLM_F_CREATE here but 4529 * userspace already relies on not having to provide this. 4530 */ 4531 return inet6_addr_add(net, ifm->ifa_index, pfx, peer_pfx, 4532 ifm->ifa_prefixlen, ifa_flags, 4533 preferred_lft, valid_lft); 4534 } 4535 4536 if (nlh->nlmsg_flags & NLM_F_EXCL || 4537 !(nlh->nlmsg_flags & NLM_F_REPLACE)) 4538 err = -EEXIST; 4539 else 4540 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft); 4541 4542 in6_ifa_put(ifa); 4543 4544 return err; 4545 } 4546 4547 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u32 flags, 4548 u8 scope, int ifindex) 4549 { 4550 struct ifaddrmsg *ifm; 4551 4552 ifm = nlmsg_data(nlh); 4553 ifm->ifa_family = AF_INET6; 4554 ifm->ifa_prefixlen = prefixlen; 4555 ifm->ifa_flags = flags; 4556 ifm->ifa_scope = scope; 4557 ifm->ifa_index = ifindex; 4558 } 4559 4560 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp, 4561 unsigned long tstamp, u32 preferred, u32 valid) 4562 { 4563 struct ifa_cacheinfo ci; 4564 4565 ci.cstamp = cstamp_delta(cstamp); 4566 ci.tstamp = cstamp_delta(tstamp); 4567 ci.ifa_prefered = preferred; 4568 ci.ifa_valid = valid; 4569 4570 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci); 4571 } 4572 4573 static inline int rt_scope(int ifa_scope) 4574 { 4575 if (ifa_scope & IFA_HOST) 4576 return RT_SCOPE_HOST; 4577 else if (ifa_scope & IFA_LINK) 4578 return RT_SCOPE_LINK; 4579 else if (ifa_scope & IFA_SITE) 4580 return RT_SCOPE_SITE; 4581 else 4582 return RT_SCOPE_UNIVERSE; 4583 } 4584 4585 static inline int inet6_ifaddr_msgsize(void) 4586 { 4587 return NLMSG_ALIGN(sizeof(struct ifaddrmsg)) 4588 + nla_total_size(16) /* IFA_LOCAL */ 4589 + nla_total_size(16) /* IFA_ADDRESS */ 4590 + nla_total_size(sizeof(struct ifa_cacheinfo)) 4591 + nla_total_size(4) /* IFA_FLAGS */; 4592 } 4593 4594 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa, 4595 u32 portid, u32 seq, int event, unsigned int flags) 4596 { 4597 struct nlmsghdr *nlh; 4598 u32 preferred, valid; 4599 4600 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags); 4601 if (!nlh) 4602 return -EMSGSIZE; 4603 4604 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope), 4605 ifa->idev->dev->ifindex); 4606 4607 if (!((ifa->flags&IFA_F_PERMANENT) && 4608 (ifa->prefered_lft == INFINITY_LIFE_TIME))) { 4609 preferred = ifa->prefered_lft; 4610 valid = ifa->valid_lft; 4611 if (preferred != INFINITY_LIFE_TIME) { 4612 long tval = (jiffies - ifa->tstamp)/HZ; 4613 if (preferred > tval) 4614 preferred -= tval; 4615 else 4616 preferred = 0; 4617 if (valid != INFINITY_LIFE_TIME) { 4618 if (valid > tval) 4619 valid -= tval; 4620 else 4621 valid = 0; 4622 } 4623 } 4624 } else { 4625 preferred = INFINITY_LIFE_TIME; 4626 valid = INFINITY_LIFE_TIME; 4627 } 4628 4629 if (!ipv6_addr_any(&ifa->peer_addr)) { 4630 if (nla_put_in6_addr(skb, IFA_LOCAL, &ifa->addr) < 0 || 4631 nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->peer_addr) < 0) 4632 goto error; 4633 } else 4634 if (nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->addr) < 0) 4635 goto error; 4636 4637 if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) 4638 goto error; 4639 4640 if (nla_put_u32(skb, IFA_FLAGS, ifa->flags) < 0) 4641 goto error; 4642 4643 nlmsg_end(skb, nlh); 4644 return 0; 4645 4646 error: 4647 nlmsg_cancel(skb, nlh); 4648 return -EMSGSIZE; 4649 } 4650 4651 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca, 4652 u32 portid, u32 seq, int event, u16 flags) 4653 { 4654 struct nlmsghdr *nlh; 4655 u8 scope = RT_SCOPE_UNIVERSE; 4656 int ifindex = ifmca->idev->dev->ifindex; 4657 4658 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE) 4659 scope = RT_SCOPE_SITE; 4660 4661 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags); 4662 if (!nlh) 4663 return -EMSGSIZE; 4664 4665 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 4666 if (nla_put_in6_addr(skb, IFA_MULTICAST, &ifmca->mca_addr) < 0 || 4667 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp, 4668 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 4669 nlmsg_cancel(skb, nlh); 4670 return -EMSGSIZE; 4671 } 4672 4673 nlmsg_end(skb, nlh); 4674 return 0; 4675 } 4676 4677 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca, 4678 u32 portid, u32 seq, int event, unsigned int flags) 4679 { 4680 struct nlmsghdr *nlh; 4681 u8 scope = RT_SCOPE_UNIVERSE; 4682 int ifindex = ifaca->aca_idev->dev->ifindex; 4683 4684 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE) 4685 scope = RT_SCOPE_SITE; 4686 4687 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags); 4688 if (!nlh) 4689 return -EMSGSIZE; 4690 4691 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 4692 if (nla_put_in6_addr(skb, IFA_ANYCAST, &ifaca->aca_addr) < 0 || 4693 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp, 4694 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 4695 nlmsg_cancel(skb, nlh); 4696 return -EMSGSIZE; 4697 } 4698 4699 nlmsg_end(skb, nlh); 4700 return 0; 4701 } 4702 4703 enum addr_type_t { 4704 UNICAST_ADDR, 4705 MULTICAST_ADDR, 4706 ANYCAST_ADDR, 4707 }; 4708 4709 /* called with rcu_read_lock() */ 4710 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb, 4711 struct netlink_callback *cb, enum addr_type_t type, 4712 int s_ip_idx, int *p_ip_idx) 4713 { 4714 struct ifmcaddr6 *ifmca; 4715 struct ifacaddr6 *ifaca; 4716 int err = 1; 4717 int ip_idx = *p_ip_idx; 4718 4719 read_lock_bh(&idev->lock); 4720 switch (type) { 4721 case UNICAST_ADDR: { 4722 struct inet6_ifaddr *ifa; 4723 4724 /* unicast address incl. temp addr */ 4725 list_for_each_entry(ifa, &idev->addr_list, if_list) { 4726 if (++ip_idx < s_ip_idx) 4727 continue; 4728 err = inet6_fill_ifaddr(skb, ifa, 4729 NETLINK_CB(cb->skb).portid, 4730 cb->nlh->nlmsg_seq, 4731 RTM_NEWADDR, 4732 NLM_F_MULTI); 4733 if (err < 0) 4734 break; 4735 nl_dump_check_consistent(cb, nlmsg_hdr(skb)); 4736 } 4737 break; 4738 } 4739 case MULTICAST_ADDR: 4740 /* multicast address */ 4741 for (ifmca = idev->mc_list; ifmca; 4742 ifmca = ifmca->next, ip_idx++) { 4743 if (ip_idx < s_ip_idx) 4744 continue; 4745 err = inet6_fill_ifmcaddr(skb, ifmca, 4746 NETLINK_CB(cb->skb).portid, 4747 cb->nlh->nlmsg_seq, 4748 RTM_GETMULTICAST, 4749 NLM_F_MULTI); 4750 if (err < 0) 4751 break; 4752 } 4753 break; 4754 case ANYCAST_ADDR: 4755 /* anycast address */ 4756 for (ifaca = idev->ac_list; ifaca; 4757 ifaca = ifaca->aca_next, ip_idx++) { 4758 if (ip_idx < s_ip_idx) 4759 continue; 4760 err = inet6_fill_ifacaddr(skb, ifaca, 4761 NETLINK_CB(cb->skb).portid, 4762 cb->nlh->nlmsg_seq, 4763 RTM_GETANYCAST, 4764 NLM_F_MULTI); 4765 if (err < 0) 4766 break; 4767 } 4768 break; 4769 default: 4770 break; 4771 } 4772 read_unlock_bh(&idev->lock); 4773 *p_ip_idx = ip_idx; 4774 return err; 4775 } 4776 4777 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb, 4778 enum addr_type_t type) 4779 { 4780 struct net *net = sock_net(skb->sk); 4781 int h, s_h; 4782 int idx, ip_idx; 4783 int s_idx, s_ip_idx; 4784 struct net_device *dev; 4785 struct inet6_dev *idev; 4786 struct hlist_head *head; 4787 4788 s_h = cb->args[0]; 4789 s_idx = idx = cb->args[1]; 4790 s_ip_idx = ip_idx = cb->args[2]; 4791 4792 rcu_read_lock(); 4793 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ net->dev_base_seq; 4794 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 4795 idx = 0; 4796 head = &net->dev_index_head[h]; 4797 hlist_for_each_entry_rcu(dev, head, index_hlist) { 4798 if (idx < s_idx) 4799 goto cont; 4800 if (h > s_h || idx > s_idx) 4801 s_ip_idx = 0; 4802 ip_idx = 0; 4803 idev = __in6_dev_get(dev); 4804 if (!idev) 4805 goto cont; 4806 4807 if (in6_dump_addrs(idev, skb, cb, type, 4808 s_ip_idx, &ip_idx) < 0) 4809 goto done; 4810 cont: 4811 idx++; 4812 } 4813 } 4814 done: 4815 rcu_read_unlock(); 4816 cb->args[0] = h; 4817 cb->args[1] = idx; 4818 cb->args[2] = ip_idx; 4819 4820 return skb->len; 4821 } 4822 4823 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb) 4824 { 4825 enum addr_type_t type = UNICAST_ADDR; 4826 4827 return inet6_dump_addr(skb, cb, type); 4828 } 4829 4830 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb) 4831 { 4832 enum addr_type_t type = MULTICAST_ADDR; 4833 4834 return inet6_dump_addr(skb, cb, type); 4835 } 4836 4837 4838 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb) 4839 { 4840 enum addr_type_t type = ANYCAST_ADDR; 4841 4842 return inet6_dump_addr(skb, cb, type); 4843 } 4844 4845 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh) 4846 { 4847 struct net *net = sock_net(in_skb->sk); 4848 struct ifaddrmsg *ifm; 4849 struct nlattr *tb[IFA_MAX+1]; 4850 struct in6_addr *addr = NULL, *peer; 4851 struct net_device *dev = NULL; 4852 struct inet6_ifaddr *ifa; 4853 struct sk_buff *skb; 4854 int err; 4855 4856 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy); 4857 if (err < 0) 4858 goto errout; 4859 4860 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer); 4861 if (!addr) { 4862 err = -EINVAL; 4863 goto errout; 4864 } 4865 4866 ifm = nlmsg_data(nlh); 4867 if (ifm->ifa_index) 4868 dev = __dev_get_by_index(net, ifm->ifa_index); 4869 4870 ifa = ipv6_get_ifaddr(net, addr, dev, 1); 4871 if (!ifa) { 4872 err = -EADDRNOTAVAIL; 4873 goto errout; 4874 } 4875 4876 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL); 4877 if (!skb) { 4878 err = -ENOBUFS; 4879 goto errout_ifa; 4880 } 4881 4882 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).portid, 4883 nlh->nlmsg_seq, RTM_NEWADDR, 0); 4884 if (err < 0) { 4885 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 4886 WARN_ON(err == -EMSGSIZE); 4887 kfree_skb(skb); 4888 goto errout_ifa; 4889 } 4890 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid); 4891 errout_ifa: 4892 in6_ifa_put(ifa); 4893 errout: 4894 return err; 4895 } 4896 4897 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa) 4898 { 4899 struct sk_buff *skb; 4900 struct net *net = dev_net(ifa->idev->dev); 4901 int err = -ENOBUFS; 4902 4903 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC); 4904 if (!skb) 4905 goto errout; 4906 4907 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0); 4908 if (err < 0) { 4909 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 4910 WARN_ON(err == -EMSGSIZE); 4911 kfree_skb(skb); 4912 goto errout; 4913 } 4914 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC); 4915 return; 4916 errout: 4917 if (err < 0) 4918 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err); 4919 } 4920 4921 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf, 4922 __s32 *array, int bytes) 4923 { 4924 BUG_ON(bytes < (DEVCONF_MAX * 4)); 4925 4926 memset(array, 0, bytes); 4927 array[DEVCONF_FORWARDING] = cnf->forwarding; 4928 array[DEVCONF_HOPLIMIT] = cnf->hop_limit; 4929 array[DEVCONF_MTU6] = cnf->mtu6; 4930 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra; 4931 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects; 4932 array[DEVCONF_AUTOCONF] = cnf->autoconf; 4933 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits; 4934 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits; 4935 array[DEVCONF_RTR_SOLICIT_INTERVAL] = 4936 jiffies_to_msecs(cnf->rtr_solicit_interval); 4937 array[DEVCONF_RTR_SOLICIT_MAX_INTERVAL] = 4938 jiffies_to_msecs(cnf->rtr_solicit_max_interval); 4939 array[DEVCONF_RTR_SOLICIT_DELAY] = 4940 jiffies_to_msecs(cnf->rtr_solicit_delay); 4941 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version; 4942 array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] = 4943 jiffies_to_msecs(cnf->mldv1_unsolicited_report_interval); 4944 array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] = 4945 jiffies_to_msecs(cnf->mldv2_unsolicited_report_interval); 4946 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr; 4947 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft; 4948 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft; 4949 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry; 4950 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor; 4951 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses; 4952 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr; 4953 array[DEVCONF_ACCEPT_RA_MIN_HOP_LIMIT] = cnf->accept_ra_min_hop_limit; 4954 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo; 4955 #ifdef CONFIG_IPV6_ROUTER_PREF 4956 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref; 4957 array[DEVCONF_RTR_PROBE_INTERVAL] = 4958 jiffies_to_msecs(cnf->rtr_probe_interval); 4959 #ifdef CONFIG_IPV6_ROUTE_INFO 4960 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen; 4961 #endif 4962 #endif 4963 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp; 4964 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route; 4965 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 4966 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad; 4967 array[DEVCONF_USE_OPTIMISTIC] = cnf->use_optimistic; 4968 #endif 4969 #ifdef CONFIG_IPV6_MROUTE 4970 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding; 4971 #endif 4972 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6; 4973 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad; 4974 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao; 4975 array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify; 4976 array[DEVCONF_SUPPRESS_FRAG_NDISC] = cnf->suppress_frag_ndisc; 4977 array[DEVCONF_ACCEPT_RA_FROM_LOCAL] = cnf->accept_ra_from_local; 4978 array[DEVCONF_ACCEPT_RA_MTU] = cnf->accept_ra_mtu; 4979 array[DEVCONF_IGNORE_ROUTES_WITH_LINKDOWN] = cnf->ignore_routes_with_linkdown; 4980 /* we omit DEVCONF_STABLE_SECRET for now */ 4981 array[DEVCONF_USE_OIF_ADDRS_ONLY] = cnf->use_oif_addrs_only; 4982 array[DEVCONF_DROP_UNICAST_IN_L2_MULTICAST] = cnf->drop_unicast_in_l2_multicast; 4983 array[DEVCONF_DROP_UNSOLICITED_NA] = cnf->drop_unsolicited_na; 4984 array[DEVCONF_KEEP_ADDR_ON_DOWN] = cnf->keep_addr_on_down; 4985 array[DEVCONF_SEG6_ENABLED] = cnf->seg6_enabled; 4986 #ifdef CONFIG_IPV6_SEG6_HMAC 4987 array[DEVCONF_SEG6_REQUIRE_HMAC] = cnf->seg6_require_hmac; 4988 #endif 4989 array[DEVCONF_ENHANCED_DAD] = cnf->enhanced_dad; 4990 } 4991 4992 static inline size_t inet6_ifla6_size(void) 4993 { 4994 return nla_total_size(4) /* IFLA_INET6_FLAGS */ 4995 + nla_total_size(sizeof(struct ifla_cacheinfo)) 4996 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */ 4997 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */ 4998 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */ 4999 + nla_total_size(sizeof(struct in6_addr)); /* IFLA_INET6_TOKEN */ 5000 } 5001 5002 static inline size_t inet6_if_nlmsg_size(void) 5003 { 5004 return NLMSG_ALIGN(sizeof(struct ifinfomsg)) 5005 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */ 5006 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */ 5007 + nla_total_size(4) /* IFLA_MTU */ 5008 + nla_total_size(4) /* IFLA_LINK */ 5009 + nla_total_size(1) /* IFLA_OPERSTATE */ 5010 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */ 5011 } 5012 5013 static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib, 5014 int bytes) 5015 { 5016 int i; 5017 int pad = bytes - sizeof(u64) * ICMP6_MIB_MAX; 5018 BUG_ON(pad < 0); 5019 5020 /* Use put_unaligned() because stats may not be aligned for u64. */ 5021 put_unaligned(ICMP6_MIB_MAX, &stats[0]); 5022 for (i = 1; i < ICMP6_MIB_MAX; i++) 5023 put_unaligned(atomic_long_read(&mib[i]), &stats[i]); 5024 5025 memset(&stats[ICMP6_MIB_MAX], 0, pad); 5026 } 5027 5028 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu *mib, 5029 int bytes, size_t syncpoff) 5030 { 5031 int i, c; 5032 u64 buff[IPSTATS_MIB_MAX]; 5033 int pad = bytes - sizeof(u64) * IPSTATS_MIB_MAX; 5034 5035 BUG_ON(pad < 0); 5036 5037 memset(buff, 0, sizeof(buff)); 5038 buff[0] = IPSTATS_MIB_MAX; 5039 5040 for_each_possible_cpu(c) { 5041 for (i = 1; i < IPSTATS_MIB_MAX; i++) 5042 buff[i] += snmp_get_cpu_field64(mib, c, i, syncpoff); 5043 } 5044 5045 memcpy(stats, buff, IPSTATS_MIB_MAX * sizeof(u64)); 5046 memset(&stats[IPSTATS_MIB_MAX], 0, pad); 5047 } 5048 5049 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype, 5050 int bytes) 5051 { 5052 switch (attrtype) { 5053 case IFLA_INET6_STATS: 5054 __snmp6_fill_stats64(stats, idev->stats.ipv6, bytes, 5055 offsetof(struct ipstats_mib, syncp)); 5056 break; 5057 case IFLA_INET6_ICMP6STATS: 5058 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, bytes); 5059 break; 5060 } 5061 } 5062 5063 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev, 5064 u32 ext_filter_mask) 5065 { 5066 struct nlattr *nla; 5067 struct ifla_cacheinfo ci; 5068 5069 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags)) 5070 goto nla_put_failure; 5071 ci.max_reasm_len = IPV6_MAXPLEN; 5072 ci.tstamp = cstamp_delta(idev->tstamp); 5073 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time); 5074 ci.retrans_time = jiffies_to_msecs(NEIGH_VAR(idev->nd_parms, RETRANS_TIME)); 5075 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci)) 5076 goto nla_put_failure; 5077 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32)); 5078 if (!nla) 5079 goto nla_put_failure; 5080 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla)); 5081 5082 /* XXX - MC not implemented */ 5083 5084 if (ext_filter_mask & RTEXT_FILTER_SKIP_STATS) 5085 return 0; 5086 5087 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64)); 5088 if (!nla) 5089 goto nla_put_failure; 5090 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla)); 5091 5092 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64)); 5093 if (!nla) 5094 goto nla_put_failure; 5095 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla)); 5096 5097 nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr)); 5098 if (!nla) 5099 goto nla_put_failure; 5100 5101 if (nla_put_u8(skb, IFLA_INET6_ADDR_GEN_MODE, idev->addr_gen_mode)) 5102 goto nla_put_failure; 5103 5104 read_lock_bh(&idev->lock); 5105 memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla)); 5106 read_unlock_bh(&idev->lock); 5107 5108 return 0; 5109 5110 nla_put_failure: 5111 return -EMSGSIZE; 5112 } 5113 5114 static size_t inet6_get_link_af_size(const struct net_device *dev, 5115 u32 ext_filter_mask) 5116 { 5117 if (!__in6_dev_get(dev)) 5118 return 0; 5119 5120 return inet6_ifla6_size(); 5121 } 5122 5123 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev, 5124 u32 ext_filter_mask) 5125 { 5126 struct inet6_dev *idev = __in6_dev_get(dev); 5127 5128 if (!idev) 5129 return -ENODATA; 5130 5131 if (inet6_fill_ifla6_attrs(skb, idev, ext_filter_mask) < 0) 5132 return -EMSGSIZE; 5133 5134 return 0; 5135 } 5136 5137 static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token) 5138 { 5139 struct inet6_ifaddr *ifp; 5140 struct net_device *dev = idev->dev; 5141 bool clear_token, update_rs = false; 5142 struct in6_addr ll_addr; 5143 5144 ASSERT_RTNL(); 5145 5146 if (!token) 5147 return -EINVAL; 5148 if (dev->flags & (IFF_LOOPBACK | IFF_NOARP)) 5149 return -EINVAL; 5150 if (!ipv6_accept_ra(idev)) 5151 return -EINVAL; 5152 if (idev->cnf.rtr_solicits == 0) 5153 return -EINVAL; 5154 5155 write_lock_bh(&idev->lock); 5156 5157 BUILD_BUG_ON(sizeof(token->s6_addr) != 16); 5158 memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8); 5159 5160 write_unlock_bh(&idev->lock); 5161 5162 clear_token = ipv6_addr_any(token); 5163 if (clear_token) 5164 goto update_lft; 5165 5166 if (!idev->dead && (idev->if_flags & IF_READY) && 5167 !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE | 5168 IFA_F_OPTIMISTIC)) { 5169 /* If we're not ready, then normal ifup will take care 5170 * of this. Otherwise, we need to request our rs here. 5171 */ 5172 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters); 5173 update_rs = true; 5174 } 5175 5176 update_lft: 5177 write_lock_bh(&idev->lock); 5178 5179 if (update_rs) { 5180 idev->if_flags |= IF_RS_SENT; 5181 idev->rs_interval = rfc3315_s14_backoff_init( 5182 idev->cnf.rtr_solicit_interval); 5183 idev->rs_probes = 1; 5184 addrconf_mod_rs_timer(idev, idev->rs_interval); 5185 } 5186 5187 /* Well, that's kinda nasty ... */ 5188 list_for_each_entry(ifp, &idev->addr_list, if_list) { 5189 spin_lock(&ifp->lock); 5190 if (ifp->tokenized) { 5191 ifp->valid_lft = 0; 5192 ifp->prefered_lft = 0; 5193 } 5194 spin_unlock(&ifp->lock); 5195 } 5196 5197 write_unlock_bh(&idev->lock); 5198 inet6_ifinfo_notify(RTM_NEWLINK, idev); 5199 addrconf_verify_rtnl(); 5200 return 0; 5201 } 5202 5203 static const struct nla_policy inet6_af_policy[IFLA_INET6_MAX + 1] = { 5204 [IFLA_INET6_ADDR_GEN_MODE] = { .type = NLA_U8 }, 5205 [IFLA_INET6_TOKEN] = { .len = sizeof(struct in6_addr) }, 5206 }; 5207 5208 static int inet6_validate_link_af(const struct net_device *dev, 5209 const struct nlattr *nla) 5210 { 5211 struct nlattr *tb[IFLA_INET6_MAX + 1]; 5212 5213 if (dev && !__in6_dev_get(dev)) 5214 return -EAFNOSUPPORT; 5215 5216 return nla_parse_nested(tb, IFLA_INET6_MAX, nla, inet6_af_policy); 5217 } 5218 5219 static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla) 5220 { 5221 int err = -EINVAL; 5222 struct inet6_dev *idev = __in6_dev_get(dev); 5223 struct nlattr *tb[IFLA_INET6_MAX + 1]; 5224 5225 if (!idev) 5226 return -EAFNOSUPPORT; 5227 5228 if (nla_parse_nested(tb, IFLA_INET6_MAX, nla, NULL) < 0) 5229 BUG(); 5230 5231 if (tb[IFLA_INET6_TOKEN]) { 5232 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN])); 5233 if (err) 5234 return err; 5235 } 5236 5237 if (tb[IFLA_INET6_ADDR_GEN_MODE]) { 5238 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]); 5239 5240 if (mode != IN6_ADDR_GEN_MODE_EUI64 && 5241 mode != IN6_ADDR_GEN_MODE_NONE && 5242 mode != IN6_ADDR_GEN_MODE_STABLE_PRIVACY && 5243 mode != IN6_ADDR_GEN_MODE_RANDOM) 5244 return -EINVAL; 5245 5246 if (mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY && 5247 !idev->cnf.stable_secret.initialized && 5248 !dev_net(dev)->ipv6.devconf_dflt->stable_secret.initialized) 5249 return -EINVAL; 5250 5251 idev->addr_gen_mode = mode; 5252 err = 0; 5253 } 5254 5255 return err; 5256 } 5257 5258 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev, 5259 u32 portid, u32 seq, int event, unsigned int flags) 5260 { 5261 struct net_device *dev = idev->dev; 5262 struct ifinfomsg *hdr; 5263 struct nlmsghdr *nlh; 5264 void *protoinfo; 5265 5266 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags); 5267 if (!nlh) 5268 return -EMSGSIZE; 5269 5270 hdr = nlmsg_data(nlh); 5271 hdr->ifi_family = AF_INET6; 5272 hdr->__ifi_pad = 0; 5273 hdr->ifi_type = dev->type; 5274 hdr->ifi_index = dev->ifindex; 5275 hdr->ifi_flags = dev_get_flags(dev); 5276 hdr->ifi_change = 0; 5277 5278 if (nla_put_string(skb, IFLA_IFNAME, dev->name) || 5279 (dev->addr_len && 5280 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) || 5281 nla_put_u32(skb, IFLA_MTU, dev->mtu) || 5282 (dev->ifindex != dev_get_iflink(dev) && 5283 nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))) || 5284 nla_put_u8(skb, IFLA_OPERSTATE, 5285 netif_running(dev) ? dev->operstate : IF_OPER_DOWN)) 5286 goto nla_put_failure; 5287 protoinfo = nla_nest_start(skb, IFLA_PROTINFO); 5288 if (!protoinfo) 5289 goto nla_put_failure; 5290 5291 if (inet6_fill_ifla6_attrs(skb, idev, 0) < 0) 5292 goto nla_put_failure; 5293 5294 nla_nest_end(skb, protoinfo); 5295 nlmsg_end(skb, nlh); 5296 return 0; 5297 5298 nla_put_failure: 5299 nlmsg_cancel(skb, nlh); 5300 return -EMSGSIZE; 5301 } 5302 5303 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb) 5304 { 5305 struct net *net = sock_net(skb->sk); 5306 int h, s_h; 5307 int idx = 0, s_idx; 5308 struct net_device *dev; 5309 struct inet6_dev *idev; 5310 struct hlist_head *head; 5311 5312 s_h = cb->args[0]; 5313 s_idx = cb->args[1]; 5314 5315 rcu_read_lock(); 5316 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 5317 idx = 0; 5318 head = &net->dev_index_head[h]; 5319 hlist_for_each_entry_rcu(dev, head, index_hlist) { 5320 if (idx < s_idx) 5321 goto cont; 5322 idev = __in6_dev_get(dev); 5323 if (!idev) 5324 goto cont; 5325 if (inet6_fill_ifinfo(skb, idev, 5326 NETLINK_CB(cb->skb).portid, 5327 cb->nlh->nlmsg_seq, 5328 RTM_NEWLINK, NLM_F_MULTI) < 0) 5329 goto out; 5330 cont: 5331 idx++; 5332 } 5333 } 5334 out: 5335 rcu_read_unlock(); 5336 cb->args[1] = idx; 5337 cb->args[0] = h; 5338 5339 return skb->len; 5340 } 5341 5342 void inet6_ifinfo_notify(int event, struct inet6_dev *idev) 5343 { 5344 struct sk_buff *skb; 5345 struct net *net = dev_net(idev->dev); 5346 int err = -ENOBUFS; 5347 5348 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC); 5349 if (!skb) 5350 goto errout; 5351 5352 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0); 5353 if (err < 0) { 5354 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */ 5355 WARN_ON(err == -EMSGSIZE); 5356 kfree_skb(skb); 5357 goto errout; 5358 } 5359 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC); 5360 return; 5361 errout: 5362 if (err < 0) 5363 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err); 5364 } 5365 5366 static inline size_t inet6_prefix_nlmsg_size(void) 5367 { 5368 return NLMSG_ALIGN(sizeof(struct prefixmsg)) 5369 + nla_total_size(sizeof(struct in6_addr)) 5370 + nla_total_size(sizeof(struct prefix_cacheinfo)); 5371 } 5372 5373 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev, 5374 struct prefix_info *pinfo, u32 portid, u32 seq, 5375 int event, unsigned int flags) 5376 { 5377 struct prefixmsg *pmsg; 5378 struct nlmsghdr *nlh; 5379 struct prefix_cacheinfo ci; 5380 5381 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags); 5382 if (!nlh) 5383 return -EMSGSIZE; 5384 5385 pmsg = nlmsg_data(nlh); 5386 pmsg->prefix_family = AF_INET6; 5387 pmsg->prefix_pad1 = 0; 5388 pmsg->prefix_pad2 = 0; 5389 pmsg->prefix_ifindex = idev->dev->ifindex; 5390 pmsg->prefix_len = pinfo->prefix_len; 5391 pmsg->prefix_type = pinfo->type; 5392 pmsg->prefix_pad3 = 0; 5393 pmsg->prefix_flags = 0; 5394 if (pinfo->onlink) 5395 pmsg->prefix_flags |= IF_PREFIX_ONLINK; 5396 if (pinfo->autoconf) 5397 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF; 5398 5399 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix)) 5400 goto nla_put_failure; 5401 ci.preferred_time = ntohl(pinfo->prefered); 5402 ci.valid_time = ntohl(pinfo->valid); 5403 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci)) 5404 goto nla_put_failure; 5405 nlmsg_end(skb, nlh); 5406 return 0; 5407 5408 nla_put_failure: 5409 nlmsg_cancel(skb, nlh); 5410 return -EMSGSIZE; 5411 } 5412 5413 static void inet6_prefix_notify(int event, struct inet6_dev *idev, 5414 struct prefix_info *pinfo) 5415 { 5416 struct sk_buff *skb; 5417 struct net *net = dev_net(idev->dev); 5418 int err = -ENOBUFS; 5419 5420 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC); 5421 if (!skb) 5422 goto errout; 5423 5424 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0); 5425 if (err < 0) { 5426 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */ 5427 WARN_ON(err == -EMSGSIZE); 5428 kfree_skb(skb); 5429 goto errout; 5430 } 5431 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC); 5432 return; 5433 errout: 5434 if (err < 0) 5435 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err); 5436 } 5437 5438 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 5439 { 5440 struct net *net = dev_net(ifp->idev->dev); 5441 5442 if (event) 5443 ASSERT_RTNL(); 5444 5445 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp); 5446 5447 switch (event) { 5448 case RTM_NEWADDR: 5449 /* 5450 * If the address was optimistic 5451 * we inserted the route at the start of 5452 * our DAD process, so we don't need 5453 * to do it again 5454 */ 5455 if (!(ifp->rt->rt6i_node)) 5456 ip6_ins_rt(ifp->rt); 5457 if (ifp->idev->cnf.forwarding) 5458 addrconf_join_anycast(ifp); 5459 if (!ipv6_addr_any(&ifp->peer_addr)) 5460 addrconf_prefix_route(&ifp->peer_addr, 128, 5461 ifp->idev->dev, 0, 0); 5462 break; 5463 case RTM_DELADDR: 5464 if (ifp->idev->cnf.forwarding) 5465 addrconf_leave_anycast(ifp); 5466 addrconf_leave_solict(ifp->idev, &ifp->addr); 5467 if (!ipv6_addr_any(&ifp->peer_addr)) { 5468 struct rt6_info *rt; 5469 5470 rt = addrconf_get_prefix_route(&ifp->peer_addr, 128, 5471 ifp->idev->dev, 0, 0); 5472 if (rt) 5473 ip6_del_rt(rt); 5474 } 5475 if (ifp->rt) { 5476 dst_hold(&ifp->rt->dst); 5477 ip6_del_rt(ifp->rt); 5478 } 5479 rt_genid_bump_ipv6(net); 5480 break; 5481 } 5482 atomic_inc(&net->ipv6.dev_addr_genid); 5483 } 5484 5485 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 5486 { 5487 rcu_read_lock_bh(); 5488 if (likely(ifp->idev->dead == 0)) 5489 __ipv6_ifa_notify(event, ifp); 5490 rcu_read_unlock_bh(); 5491 } 5492 5493 #ifdef CONFIG_SYSCTL 5494 5495 static 5496 int addrconf_sysctl_forward(struct ctl_table *ctl, int write, 5497 void __user *buffer, size_t *lenp, loff_t *ppos) 5498 { 5499 int *valp = ctl->data; 5500 int val = *valp; 5501 loff_t pos = *ppos; 5502 struct ctl_table lctl; 5503 int ret; 5504 5505 /* 5506 * ctl->data points to idev->cnf.forwarding, we should 5507 * not modify it until we get the rtnl lock. 5508 */ 5509 lctl = *ctl; 5510 lctl.data = &val; 5511 5512 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 5513 5514 if (write) 5515 ret = addrconf_fixup_forwarding(ctl, valp, val); 5516 if (ret) 5517 *ppos = pos; 5518 return ret; 5519 } 5520 5521 static 5522 int addrconf_sysctl_mtu(struct ctl_table *ctl, int write, 5523 void __user *buffer, size_t *lenp, loff_t *ppos) 5524 { 5525 struct inet6_dev *idev = ctl->extra1; 5526 int min_mtu = IPV6_MIN_MTU; 5527 struct ctl_table lctl; 5528 5529 lctl = *ctl; 5530 lctl.extra1 = &min_mtu; 5531 lctl.extra2 = idev ? &idev->dev->mtu : NULL; 5532 5533 return proc_dointvec_minmax(&lctl, write, buffer, lenp, ppos); 5534 } 5535 5536 static void dev_disable_change(struct inet6_dev *idev) 5537 { 5538 struct netdev_notifier_info info; 5539 5540 if (!idev || !idev->dev) 5541 return; 5542 5543 netdev_notifier_info_init(&info, idev->dev); 5544 if (idev->cnf.disable_ipv6) 5545 addrconf_notify(NULL, NETDEV_DOWN, &info); 5546 else 5547 addrconf_notify(NULL, NETDEV_UP, &info); 5548 } 5549 5550 static void addrconf_disable_change(struct net *net, __s32 newf) 5551 { 5552 struct net_device *dev; 5553 struct inet6_dev *idev; 5554 5555 for_each_netdev(net, dev) { 5556 idev = __in6_dev_get(dev); 5557 if (idev) { 5558 int changed = (!idev->cnf.disable_ipv6) ^ (!newf); 5559 idev->cnf.disable_ipv6 = newf; 5560 if (changed) 5561 dev_disable_change(idev); 5562 } 5563 } 5564 } 5565 5566 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf) 5567 { 5568 struct net *net; 5569 int old; 5570 5571 if (!rtnl_trylock()) 5572 return restart_syscall(); 5573 5574 net = (struct net *)table->extra2; 5575 old = *p; 5576 *p = newf; 5577 5578 if (p == &net->ipv6.devconf_dflt->disable_ipv6) { 5579 rtnl_unlock(); 5580 return 0; 5581 } 5582 5583 if (p == &net->ipv6.devconf_all->disable_ipv6) { 5584 net->ipv6.devconf_dflt->disable_ipv6 = newf; 5585 addrconf_disable_change(net, newf); 5586 } else if ((!newf) ^ (!old)) 5587 dev_disable_change((struct inet6_dev *)table->extra1); 5588 5589 rtnl_unlock(); 5590 return 0; 5591 } 5592 5593 static 5594 int addrconf_sysctl_disable(struct ctl_table *ctl, int write, 5595 void __user *buffer, size_t *lenp, loff_t *ppos) 5596 { 5597 int *valp = ctl->data; 5598 int val = *valp; 5599 loff_t pos = *ppos; 5600 struct ctl_table lctl; 5601 int ret; 5602 5603 /* 5604 * ctl->data points to idev->cnf.disable_ipv6, we should 5605 * not modify it until we get the rtnl lock. 5606 */ 5607 lctl = *ctl; 5608 lctl.data = &val; 5609 5610 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 5611 5612 if (write) 5613 ret = addrconf_disable_ipv6(ctl, valp, val); 5614 if (ret) 5615 *ppos = pos; 5616 return ret; 5617 } 5618 5619 static 5620 int addrconf_sysctl_proxy_ndp(struct ctl_table *ctl, int write, 5621 void __user *buffer, size_t *lenp, loff_t *ppos) 5622 { 5623 int *valp = ctl->data; 5624 int ret; 5625 int old, new; 5626 5627 old = *valp; 5628 ret = proc_dointvec(ctl, write, buffer, lenp, ppos); 5629 new = *valp; 5630 5631 if (write && old != new) { 5632 struct net *net = ctl->extra2; 5633 5634 if (!rtnl_trylock()) 5635 return restart_syscall(); 5636 5637 if (valp == &net->ipv6.devconf_dflt->proxy_ndp) 5638 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH, 5639 NETCONFA_IFINDEX_DEFAULT, 5640 net->ipv6.devconf_dflt); 5641 else if (valp == &net->ipv6.devconf_all->proxy_ndp) 5642 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH, 5643 NETCONFA_IFINDEX_ALL, 5644 net->ipv6.devconf_all); 5645 else { 5646 struct inet6_dev *idev = ctl->extra1; 5647 5648 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH, 5649 idev->dev->ifindex, 5650 &idev->cnf); 5651 } 5652 rtnl_unlock(); 5653 } 5654 5655 return ret; 5656 } 5657 5658 static int addrconf_sysctl_stable_secret(struct ctl_table *ctl, int write, 5659 void __user *buffer, size_t *lenp, 5660 loff_t *ppos) 5661 { 5662 int err; 5663 struct in6_addr addr; 5664 char str[IPV6_MAX_STRLEN]; 5665 struct ctl_table lctl = *ctl; 5666 struct net *net = ctl->extra2; 5667 struct ipv6_stable_secret *secret = ctl->data; 5668 5669 if (&net->ipv6.devconf_all->stable_secret == ctl->data) 5670 return -EIO; 5671 5672 lctl.maxlen = IPV6_MAX_STRLEN; 5673 lctl.data = str; 5674 5675 if (!rtnl_trylock()) 5676 return restart_syscall(); 5677 5678 if (!write && !secret->initialized) { 5679 err = -EIO; 5680 goto out; 5681 } 5682 5683 err = snprintf(str, sizeof(str), "%pI6", &secret->secret); 5684 if (err >= sizeof(str)) { 5685 err = -EIO; 5686 goto out; 5687 } 5688 5689 err = proc_dostring(&lctl, write, buffer, lenp, ppos); 5690 if (err || !write) 5691 goto out; 5692 5693 if (in6_pton(str, -1, addr.in6_u.u6_addr8, -1, NULL) != 1) { 5694 err = -EIO; 5695 goto out; 5696 } 5697 5698 secret->initialized = true; 5699 secret->secret = addr; 5700 5701 if (&net->ipv6.devconf_dflt->stable_secret == ctl->data) { 5702 struct net_device *dev; 5703 5704 for_each_netdev(net, dev) { 5705 struct inet6_dev *idev = __in6_dev_get(dev); 5706 5707 if (idev) { 5708 idev->addr_gen_mode = 5709 IN6_ADDR_GEN_MODE_STABLE_PRIVACY; 5710 } 5711 } 5712 } else { 5713 struct inet6_dev *idev = ctl->extra1; 5714 5715 idev->addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY; 5716 } 5717 5718 out: 5719 rtnl_unlock(); 5720 5721 return err; 5722 } 5723 5724 static 5725 int addrconf_sysctl_ignore_routes_with_linkdown(struct ctl_table *ctl, 5726 int write, 5727 void __user *buffer, 5728 size_t *lenp, 5729 loff_t *ppos) 5730 { 5731 int *valp = ctl->data; 5732 int val = *valp; 5733 loff_t pos = *ppos; 5734 struct ctl_table lctl; 5735 int ret; 5736 5737 /* ctl->data points to idev->cnf.ignore_routes_when_linkdown 5738 * we should not modify it until we get the rtnl lock. 5739 */ 5740 lctl = *ctl; 5741 lctl.data = &val; 5742 5743 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 5744 5745 if (write) 5746 ret = addrconf_fixup_linkdown(ctl, valp, val); 5747 if (ret) 5748 *ppos = pos; 5749 return ret; 5750 } 5751 5752 static int minus_one = -1; 5753 static const int one = 1; 5754 static const int two_five_five = 255; 5755 5756 static const struct ctl_table addrconf_sysctl[] = { 5757 { 5758 .procname = "forwarding", 5759 .data = &ipv6_devconf.forwarding, 5760 .maxlen = sizeof(int), 5761 .mode = 0644, 5762 .proc_handler = addrconf_sysctl_forward, 5763 }, 5764 { 5765 .procname = "hop_limit", 5766 .data = &ipv6_devconf.hop_limit, 5767 .maxlen = sizeof(int), 5768 .mode = 0644, 5769 .proc_handler = proc_dointvec_minmax, 5770 .extra1 = (void *)&one, 5771 .extra2 = (void *)&two_five_five, 5772 }, 5773 { 5774 .procname = "mtu", 5775 .data = &ipv6_devconf.mtu6, 5776 .maxlen = sizeof(int), 5777 .mode = 0644, 5778 .proc_handler = addrconf_sysctl_mtu, 5779 }, 5780 { 5781 .procname = "accept_ra", 5782 .data = &ipv6_devconf.accept_ra, 5783 .maxlen = sizeof(int), 5784 .mode = 0644, 5785 .proc_handler = proc_dointvec, 5786 }, 5787 { 5788 .procname = "accept_redirects", 5789 .data = &ipv6_devconf.accept_redirects, 5790 .maxlen = sizeof(int), 5791 .mode = 0644, 5792 .proc_handler = proc_dointvec, 5793 }, 5794 { 5795 .procname = "autoconf", 5796 .data = &ipv6_devconf.autoconf, 5797 .maxlen = sizeof(int), 5798 .mode = 0644, 5799 .proc_handler = proc_dointvec, 5800 }, 5801 { 5802 .procname = "dad_transmits", 5803 .data = &ipv6_devconf.dad_transmits, 5804 .maxlen = sizeof(int), 5805 .mode = 0644, 5806 .proc_handler = proc_dointvec, 5807 }, 5808 { 5809 .procname = "router_solicitations", 5810 .data = &ipv6_devconf.rtr_solicits, 5811 .maxlen = sizeof(int), 5812 .mode = 0644, 5813 .proc_handler = proc_dointvec_minmax, 5814 .extra1 = &minus_one, 5815 }, 5816 { 5817 .procname = "router_solicitation_interval", 5818 .data = &ipv6_devconf.rtr_solicit_interval, 5819 .maxlen = sizeof(int), 5820 .mode = 0644, 5821 .proc_handler = proc_dointvec_jiffies, 5822 }, 5823 { 5824 .procname = "router_solicitation_max_interval", 5825 .data = &ipv6_devconf.rtr_solicit_max_interval, 5826 .maxlen = sizeof(int), 5827 .mode = 0644, 5828 .proc_handler = proc_dointvec_jiffies, 5829 }, 5830 { 5831 .procname = "router_solicitation_delay", 5832 .data = &ipv6_devconf.rtr_solicit_delay, 5833 .maxlen = sizeof(int), 5834 .mode = 0644, 5835 .proc_handler = proc_dointvec_jiffies, 5836 }, 5837 { 5838 .procname = "force_mld_version", 5839 .data = &ipv6_devconf.force_mld_version, 5840 .maxlen = sizeof(int), 5841 .mode = 0644, 5842 .proc_handler = proc_dointvec, 5843 }, 5844 { 5845 .procname = "mldv1_unsolicited_report_interval", 5846 .data = 5847 &ipv6_devconf.mldv1_unsolicited_report_interval, 5848 .maxlen = sizeof(int), 5849 .mode = 0644, 5850 .proc_handler = proc_dointvec_ms_jiffies, 5851 }, 5852 { 5853 .procname = "mldv2_unsolicited_report_interval", 5854 .data = 5855 &ipv6_devconf.mldv2_unsolicited_report_interval, 5856 .maxlen = sizeof(int), 5857 .mode = 0644, 5858 .proc_handler = proc_dointvec_ms_jiffies, 5859 }, 5860 { 5861 .procname = "use_tempaddr", 5862 .data = &ipv6_devconf.use_tempaddr, 5863 .maxlen = sizeof(int), 5864 .mode = 0644, 5865 .proc_handler = proc_dointvec, 5866 }, 5867 { 5868 .procname = "temp_valid_lft", 5869 .data = &ipv6_devconf.temp_valid_lft, 5870 .maxlen = sizeof(int), 5871 .mode = 0644, 5872 .proc_handler = proc_dointvec, 5873 }, 5874 { 5875 .procname = "temp_prefered_lft", 5876 .data = &ipv6_devconf.temp_prefered_lft, 5877 .maxlen = sizeof(int), 5878 .mode = 0644, 5879 .proc_handler = proc_dointvec, 5880 }, 5881 { 5882 .procname = "regen_max_retry", 5883 .data = &ipv6_devconf.regen_max_retry, 5884 .maxlen = sizeof(int), 5885 .mode = 0644, 5886 .proc_handler = proc_dointvec, 5887 }, 5888 { 5889 .procname = "max_desync_factor", 5890 .data = &ipv6_devconf.max_desync_factor, 5891 .maxlen = sizeof(int), 5892 .mode = 0644, 5893 .proc_handler = proc_dointvec, 5894 }, 5895 { 5896 .procname = "max_addresses", 5897 .data = &ipv6_devconf.max_addresses, 5898 .maxlen = sizeof(int), 5899 .mode = 0644, 5900 .proc_handler = proc_dointvec, 5901 }, 5902 { 5903 .procname = "accept_ra_defrtr", 5904 .data = &ipv6_devconf.accept_ra_defrtr, 5905 .maxlen = sizeof(int), 5906 .mode = 0644, 5907 .proc_handler = proc_dointvec, 5908 }, 5909 { 5910 .procname = "accept_ra_min_hop_limit", 5911 .data = &ipv6_devconf.accept_ra_min_hop_limit, 5912 .maxlen = sizeof(int), 5913 .mode = 0644, 5914 .proc_handler = proc_dointvec, 5915 }, 5916 { 5917 .procname = "accept_ra_pinfo", 5918 .data = &ipv6_devconf.accept_ra_pinfo, 5919 .maxlen = sizeof(int), 5920 .mode = 0644, 5921 .proc_handler = proc_dointvec, 5922 }, 5923 #ifdef CONFIG_IPV6_ROUTER_PREF 5924 { 5925 .procname = "accept_ra_rtr_pref", 5926 .data = &ipv6_devconf.accept_ra_rtr_pref, 5927 .maxlen = sizeof(int), 5928 .mode = 0644, 5929 .proc_handler = proc_dointvec, 5930 }, 5931 { 5932 .procname = "router_probe_interval", 5933 .data = &ipv6_devconf.rtr_probe_interval, 5934 .maxlen = sizeof(int), 5935 .mode = 0644, 5936 .proc_handler = proc_dointvec_jiffies, 5937 }, 5938 #ifdef CONFIG_IPV6_ROUTE_INFO 5939 { 5940 .procname = "accept_ra_rt_info_max_plen", 5941 .data = &ipv6_devconf.accept_ra_rt_info_max_plen, 5942 .maxlen = sizeof(int), 5943 .mode = 0644, 5944 .proc_handler = proc_dointvec, 5945 }, 5946 #endif 5947 #endif 5948 { 5949 .procname = "proxy_ndp", 5950 .data = &ipv6_devconf.proxy_ndp, 5951 .maxlen = sizeof(int), 5952 .mode = 0644, 5953 .proc_handler = addrconf_sysctl_proxy_ndp, 5954 }, 5955 { 5956 .procname = "accept_source_route", 5957 .data = &ipv6_devconf.accept_source_route, 5958 .maxlen = sizeof(int), 5959 .mode = 0644, 5960 .proc_handler = proc_dointvec, 5961 }, 5962 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 5963 { 5964 .procname = "optimistic_dad", 5965 .data = &ipv6_devconf.optimistic_dad, 5966 .maxlen = sizeof(int), 5967 .mode = 0644, 5968 .proc_handler = proc_dointvec, 5969 }, 5970 { 5971 .procname = "use_optimistic", 5972 .data = &ipv6_devconf.use_optimistic, 5973 .maxlen = sizeof(int), 5974 .mode = 0644, 5975 .proc_handler = proc_dointvec, 5976 }, 5977 #endif 5978 #ifdef CONFIG_IPV6_MROUTE 5979 { 5980 .procname = "mc_forwarding", 5981 .data = &ipv6_devconf.mc_forwarding, 5982 .maxlen = sizeof(int), 5983 .mode = 0444, 5984 .proc_handler = proc_dointvec, 5985 }, 5986 #endif 5987 { 5988 .procname = "disable_ipv6", 5989 .data = &ipv6_devconf.disable_ipv6, 5990 .maxlen = sizeof(int), 5991 .mode = 0644, 5992 .proc_handler = addrconf_sysctl_disable, 5993 }, 5994 { 5995 .procname = "accept_dad", 5996 .data = &ipv6_devconf.accept_dad, 5997 .maxlen = sizeof(int), 5998 .mode = 0644, 5999 .proc_handler = proc_dointvec, 6000 }, 6001 { 6002 .procname = "force_tllao", 6003 .data = &ipv6_devconf.force_tllao, 6004 .maxlen = sizeof(int), 6005 .mode = 0644, 6006 .proc_handler = proc_dointvec 6007 }, 6008 { 6009 .procname = "ndisc_notify", 6010 .data = &ipv6_devconf.ndisc_notify, 6011 .maxlen = sizeof(int), 6012 .mode = 0644, 6013 .proc_handler = proc_dointvec 6014 }, 6015 { 6016 .procname = "suppress_frag_ndisc", 6017 .data = &ipv6_devconf.suppress_frag_ndisc, 6018 .maxlen = sizeof(int), 6019 .mode = 0644, 6020 .proc_handler = proc_dointvec 6021 }, 6022 { 6023 .procname = "accept_ra_from_local", 6024 .data = &ipv6_devconf.accept_ra_from_local, 6025 .maxlen = sizeof(int), 6026 .mode = 0644, 6027 .proc_handler = proc_dointvec, 6028 }, 6029 { 6030 .procname = "accept_ra_mtu", 6031 .data = &ipv6_devconf.accept_ra_mtu, 6032 .maxlen = sizeof(int), 6033 .mode = 0644, 6034 .proc_handler = proc_dointvec, 6035 }, 6036 { 6037 .procname = "stable_secret", 6038 .data = &ipv6_devconf.stable_secret, 6039 .maxlen = IPV6_MAX_STRLEN, 6040 .mode = 0600, 6041 .proc_handler = addrconf_sysctl_stable_secret, 6042 }, 6043 { 6044 .procname = "use_oif_addrs_only", 6045 .data = &ipv6_devconf.use_oif_addrs_only, 6046 .maxlen = sizeof(int), 6047 .mode = 0644, 6048 .proc_handler = proc_dointvec, 6049 }, 6050 { 6051 .procname = "ignore_routes_with_linkdown", 6052 .data = &ipv6_devconf.ignore_routes_with_linkdown, 6053 .maxlen = sizeof(int), 6054 .mode = 0644, 6055 .proc_handler = addrconf_sysctl_ignore_routes_with_linkdown, 6056 }, 6057 { 6058 .procname = "drop_unicast_in_l2_multicast", 6059 .data = &ipv6_devconf.drop_unicast_in_l2_multicast, 6060 .maxlen = sizeof(int), 6061 .mode = 0644, 6062 .proc_handler = proc_dointvec, 6063 }, 6064 { 6065 .procname = "drop_unsolicited_na", 6066 .data = &ipv6_devconf.drop_unsolicited_na, 6067 .maxlen = sizeof(int), 6068 .mode = 0644, 6069 .proc_handler = proc_dointvec, 6070 }, 6071 { 6072 .procname = "keep_addr_on_down", 6073 .data = &ipv6_devconf.keep_addr_on_down, 6074 .maxlen = sizeof(int), 6075 .mode = 0644, 6076 .proc_handler = proc_dointvec, 6077 6078 }, 6079 { 6080 .procname = "seg6_enabled", 6081 .data = &ipv6_devconf.seg6_enabled, 6082 .maxlen = sizeof(int), 6083 .mode = 0644, 6084 .proc_handler = proc_dointvec, 6085 }, 6086 #ifdef CONFIG_IPV6_SEG6_HMAC 6087 { 6088 .procname = "seg6_require_hmac", 6089 .data = &ipv6_devconf.seg6_require_hmac, 6090 .maxlen = sizeof(int), 6091 .mode = 0644, 6092 .proc_handler = proc_dointvec, 6093 }, 6094 #endif 6095 { 6096 .procname = "enhanced_dad", 6097 .data = &ipv6_devconf.enhanced_dad, 6098 .maxlen = sizeof(int), 6099 .mode = 0644, 6100 .proc_handler = proc_dointvec, 6101 }, 6102 { 6103 /* sentinel */ 6104 } 6105 }; 6106 6107 static int __addrconf_sysctl_register(struct net *net, char *dev_name, 6108 struct inet6_dev *idev, struct ipv6_devconf *p) 6109 { 6110 int i, ifindex; 6111 struct ctl_table *table; 6112 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ]; 6113 6114 table = kmemdup(addrconf_sysctl, sizeof(addrconf_sysctl), GFP_KERNEL); 6115 if (!table) 6116 goto out; 6117 6118 for (i = 0; table[i].data; i++) { 6119 table[i].data += (char *)p - (char *)&ipv6_devconf; 6120 /* If one of these is already set, then it is not safe to 6121 * overwrite either of them: this makes proc_dointvec_minmax 6122 * usable. 6123 */ 6124 if (!table[i].extra1 && !table[i].extra2) { 6125 table[i].extra1 = idev; /* embedded; no ref */ 6126 table[i].extra2 = net; 6127 } 6128 } 6129 6130 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name); 6131 6132 p->sysctl_header = register_net_sysctl(net, path, table); 6133 if (!p->sysctl_header) 6134 goto free; 6135 6136 if (!strcmp(dev_name, "all")) 6137 ifindex = NETCONFA_IFINDEX_ALL; 6138 else if (!strcmp(dev_name, "default")) 6139 ifindex = NETCONFA_IFINDEX_DEFAULT; 6140 else 6141 ifindex = idev->dev->ifindex; 6142 inet6_netconf_notify_devconf(net, NETCONFA_ALL, ifindex, p); 6143 return 0; 6144 6145 free: 6146 kfree(table); 6147 out: 6148 return -ENOBUFS; 6149 } 6150 6151 static void __addrconf_sysctl_unregister(struct ipv6_devconf *p) 6152 { 6153 struct ctl_table *table; 6154 6155 if (!p->sysctl_header) 6156 return; 6157 6158 table = p->sysctl_header->ctl_table_arg; 6159 unregister_net_sysctl_table(p->sysctl_header); 6160 p->sysctl_header = NULL; 6161 kfree(table); 6162 } 6163 6164 static int addrconf_sysctl_register(struct inet6_dev *idev) 6165 { 6166 int err; 6167 6168 if (!sysctl_dev_name_is_allowed(idev->dev->name)) 6169 return -EINVAL; 6170 6171 err = neigh_sysctl_register(idev->dev, idev->nd_parms, 6172 &ndisc_ifinfo_sysctl_change); 6173 if (err) 6174 return err; 6175 err = __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name, 6176 idev, &idev->cnf); 6177 if (err) 6178 neigh_sysctl_unregister(idev->nd_parms); 6179 6180 return err; 6181 } 6182 6183 static void addrconf_sysctl_unregister(struct inet6_dev *idev) 6184 { 6185 __addrconf_sysctl_unregister(&idev->cnf); 6186 neigh_sysctl_unregister(idev->nd_parms); 6187 } 6188 6189 6190 #endif 6191 6192 static int __net_init addrconf_init_net(struct net *net) 6193 { 6194 int err = -ENOMEM; 6195 struct ipv6_devconf *all, *dflt; 6196 6197 all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL); 6198 if (!all) 6199 goto err_alloc_all; 6200 6201 dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL); 6202 if (!dflt) 6203 goto err_alloc_dflt; 6204 6205 /* these will be inherited by all namespaces */ 6206 dflt->autoconf = ipv6_defaults.autoconf; 6207 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6; 6208 6209 dflt->stable_secret.initialized = false; 6210 all->stable_secret.initialized = false; 6211 6212 net->ipv6.devconf_all = all; 6213 net->ipv6.devconf_dflt = dflt; 6214 6215 #ifdef CONFIG_SYSCTL 6216 err = __addrconf_sysctl_register(net, "all", NULL, all); 6217 if (err < 0) 6218 goto err_reg_all; 6219 6220 err = __addrconf_sysctl_register(net, "default", NULL, dflt); 6221 if (err < 0) 6222 goto err_reg_dflt; 6223 #endif 6224 return 0; 6225 6226 #ifdef CONFIG_SYSCTL 6227 err_reg_dflt: 6228 __addrconf_sysctl_unregister(all); 6229 err_reg_all: 6230 kfree(dflt); 6231 #endif 6232 err_alloc_dflt: 6233 kfree(all); 6234 err_alloc_all: 6235 return err; 6236 } 6237 6238 static void __net_exit addrconf_exit_net(struct net *net) 6239 { 6240 #ifdef CONFIG_SYSCTL 6241 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt); 6242 __addrconf_sysctl_unregister(net->ipv6.devconf_all); 6243 #endif 6244 kfree(net->ipv6.devconf_dflt); 6245 kfree(net->ipv6.devconf_all); 6246 } 6247 6248 static struct pernet_operations addrconf_ops = { 6249 .init = addrconf_init_net, 6250 .exit = addrconf_exit_net, 6251 }; 6252 6253 static struct rtnl_af_ops inet6_ops __read_mostly = { 6254 .family = AF_INET6, 6255 .fill_link_af = inet6_fill_link_af, 6256 .get_link_af_size = inet6_get_link_af_size, 6257 .validate_link_af = inet6_validate_link_af, 6258 .set_link_af = inet6_set_link_af, 6259 }; 6260 6261 /* 6262 * Init / cleanup code 6263 */ 6264 6265 int __init addrconf_init(void) 6266 { 6267 struct inet6_dev *idev; 6268 int i, err; 6269 6270 err = ipv6_addr_label_init(); 6271 if (err < 0) { 6272 pr_crit("%s: cannot initialize default policy table: %d\n", 6273 __func__, err); 6274 goto out; 6275 } 6276 6277 err = register_pernet_subsys(&addrconf_ops); 6278 if (err < 0) 6279 goto out_addrlabel; 6280 6281 addrconf_wq = create_workqueue("ipv6_addrconf"); 6282 if (!addrconf_wq) { 6283 err = -ENOMEM; 6284 goto out_nowq; 6285 } 6286 6287 /* The addrconf netdev notifier requires that loopback_dev 6288 * has it's ipv6 private information allocated and setup 6289 * before it can bring up and give link-local addresses 6290 * to other devices which are up. 6291 * 6292 * Unfortunately, loopback_dev is not necessarily the first 6293 * entry in the global dev_base list of net devices. In fact, 6294 * it is likely to be the very last entry on that list. 6295 * So this causes the notifier registry below to try and 6296 * give link-local addresses to all devices besides loopback_dev 6297 * first, then loopback_dev, which cases all the non-loopback_dev 6298 * devices to fail to get a link-local address. 6299 * 6300 * So, as a temporary fix, allocate the ipv6 structure for 6301 * loopback_dev first by hand. 6302 * Longer term, all of the dependencies ipv6 has upon the loopback 6303 * device and it being up should be removed. 6304 */ 6305 rtnl_lock(); 6306 idev = ipv6_add_dev(init_net.loopback_dev); 6307 rtnl_unlock(); 6308 if (IS_ERR(idev)) { 6309 err = PTR_ERR(idev); 6310 goto errlo; 6311 } 6312 6313 for (i = 0; i < IN6_ADDR_HSIZE; i++) 6314 INIT_HLIST_HEAD(&inet6_addr_lst[i]); 6315 6316 register_netdevice_notifier(&ipv6_dev_notf); 6317 6318 addrconf_verify(); 6319 6320 rtnl_af_register(&inet6_ops); 6321 6322 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo, 6323 NULL); 6324 if (err < 0) 6325 goto errout; 6326 6327 /* Only the first call to __rtnl_register can fail */ 6328 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL, NULL); 6329 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL, NULL); 6330 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr, 6331 inet6_dump_ifaddr, NULL); 6332 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL, 6333 inet6_dump_ifmcaddr, NULL); 6334 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL, 6335 inet6_dump_ifacaddr, NULL); 6336 __rtnl_register(PF_INET6, RTM_GETNETCONF, inet6_netconf_get_devconf, 6337 inet6_netconf_dump_devconf, NULL); 6338 6339 ipv6_addr_label_rtnl_register(); 6340 6341 return 0; 6342 errout: 6343 rtnl_af_unregister(&inet6_ops); 6344 unregister_netdevice_notifier(&ipv6_dev_notf); 6345 errlo: 6346 destroy_workqueue(addrconf_wq); 6347 out_nowq: 6348 unregister_pernet_subsys(&addrconf_ops); 6349 out_addrlabel: 6350 ipv6_addr_label_cleanup(); 6351 out: 6352 return err; 6353 } 6354 6355 void addrconf_cleanup(void) 6356 { 6357 struct net_device *dev; 6358 int i; 6359 6360 unregister_netdevice_notifier(&ipv6_dev_notf); 6361 unregister_pernet_subsys(&addrconf_ops); 6362 ipv6_addr_label_cleanup(); 6363 6364 rtnl_lock(); 6365 6366 __rtnl_af_unregister(&inet6_ops); 6367 6368 /* clean dev list */ 6369 for_each_netdev(&init_net, dev) { 6370 if (__in6_dev_get(dev) == NULL) 6371 continue; 6372 addrconf_ifdown(dev, 1); 6373 } 6374 addrconf_ifdown(init_net.loopback_dev, 2); 6375 6376 /* 6377 * Check hash table. 6378 */ 6379 spin_lock_bh(&addrconf_hash_lock); 6380 for (i = 0; i < IN6_ADDR_HSIZE; i++) 6381 WARN_ON(!hlist_empty(&inet6_addr_lst[i])); 6382 spin_unlock_bh(&addrconf_hash_lock); 6383 cancel_delayed_work(&addr_chk_work); 6384 rtnl_unlock(); 6385 6386 destroy_workqueue(addrconf_wq); 6387 } 6388