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/sched/signal.h> 47 #include <linux/socket.h> 48 #include <linux/sockios.h> 49 #include <linux/net.h> 50 #include <linux/inet.h> 51 #include <linux/in6.h> 52 #include <linux/netdevice.h> 53 #include <linux/if_addr.h> 54 #include <linux/if_arp.h> 55 #include <linux/if_arcnet.h> 56 #include <linux/if_infiniband.h> 57 #include <linux/route.h> 58 #include <linux/inetdevice.h> 59 #include <linux/init.h> 60 #include <linux/slab.h> 61 #ifdef CONFIG_SYSCTL 62 #include <linux/sysctl.h> 63 #endif 64 #include <linux/capability.h> 65 #include <linux/delay.h> 66 #include <linux/notifier.h> 67 #include <linux/string.h> 68 #include <linux/hash.h> 69 70 #include <net/net_namespace.h> 71 #include <net/sock.h> 72 #include <net/snmp.h> 73 74 #include <net/6lowpan.h> 75 #include <net/firewire.h> 76 #include <net/ipv6.h> 77 #include <net/protocol.h> 78 #include <net/ndisc.h> 79 #include <net/ip6_route.h> 80 #include <net/addrconf.h> 81 #include <net/tcp.h> 82 #include <net/ip.h> 83 #include <net/netlink.h> 84 #include <net/pkt_sched.h> 85 #include <net/l3mdev.h> 86 #include <linux/if_tunnel.h> 87 #include <linux/rtnetlink.h> 88 #include <linux/netconf.h> 89 #include <linux/random.h> 90 #include <linux/uaccess.h> 91 #include <asm/unaligned.h> 92 93 #include <linux/proc_fs.h> 94 #include <linux/seq_file.h> 95 #include <linux/export.h> 96 97 #define INFINITY_LIFE_TIME 0xFFFFFFFF 98 99 #define IPV6_MAX_STRLEN \ 100 sizeof("ffff:ffff:ffff:ffff:ffff:ffff:255.255.255.255") 101 102 static inline u32 cstamp_delta(unsigned long cstamp) 103 { 104 return (cstamp - INITIAL_JIFFIES) * 100UL / HZ; 105 } 106 107 static inline s32 rfc3315_s14_backoff_init(s32 irt) 108 { 109 /* multiply 'initial retransmission time' by 0.9 .. 1.1 */ 110 u64 tmp = (900000 + prandom_u32() % 200001) * (u64)irt; 111 do_div(tmp, 1000000); 112 return (s32)tmp; 113 } 114 115 static inline s32 rfc3315_s14_backoff_update(s32 rt, s32 mrt) 116 { 117 /* multiply 'retransmission timeout' by 1.9 .. 2.1 */ 118 u64 tmp = (1900000 + prandom_u32() % 200001) * (u64)rt; 119 do_div(tmp, 1000000); 120 if ((s32)tmp > mrt) { 121 /* multiply 'maximum retransmission time' by 0.9 .. 1.1 */ 122 tmp = (900000 + prandom_u32() % 200001) * (u64)mrt; 123 do_div(tmp, 1000000); 124 } 125 return (s32)tmp; 126 } 127 128 #ifdef CONFIG_SYSCTL 129 static int addrconf_sysctl_register(struct inet6_dev *idev); 130 static void addrconf_sysctl_unregister(struct inet6_dev *idev); 131 #else 132 static inline int addrconf_sysctl_register(struct inet6_dev *idev) 133 { 134 return 0; 135 } 136 137 static inline void addrconf_sysctl_unregister(struct inet6_dev *idev) 138 { 139 } 140 #endif 141 142 static void ipv6_regen_rndid(struct inet6_dev *idev); 143 static void ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr); 144 145 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev); 146 static int ipv6_count_addresses(const struct inet6_dev *idev); 147 static int ipv6_generate_stable_address(struct in6_addr *addr, 148 u8 dad_count, 149 const struct inet6_dev *idev); 150 151 #define IN6_ADDR_HSIZE_SHIFT 8 152 #define IN6_ADDR_HSIZE (1 << IN6_ADDR_HSIZE_SHIFT) 153 /* 154 * Configured unicast address hash table 155 */ 156 static struct hlist_head inet6_addr_lst[IN6_ADDR_HSIZE]; 157 static DEFINE_SPINLOCK(addrconf_hash_lock); 158 159 static void addrconf_verify(void); 160 static void addrconf_verify_rtnl(void); 161 static void addrconf_verify_work(struct work_struct *); 162 163 static struct workqueue_struct *addrconf_wq; 164 static DECLARE_DELAYED_WORK(addr_chk_work, addrconf_verify_work); 165 166 static void addrconf_join_anycast(struct inet6_ifaddr *ifp); 167 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp); 168 169 static void addrconf_type_change(struct net_device *dev, 170 unsigned long event); 171 static int addrconf_ifdown(struct net_device *dev, int how); 172 173 static struct fib6_info *addrconf_get_prefix_route(const struct in6_addr *pfx, 174 int plen, 175 const struct net_device *dev, 176 u32 flags, u32 noflags); 177 178 static void addrconf_dad_start(struct inet6_ifaddr *ifp); 179 static void addrconf_dad_work(struct work_struct *w); 180 static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id, 181 bool send_na); 182 static void addrconf_dad_run(struct inet6_dev *idev, bool restart); 183 static void addrconf_rs_timer(struct timer_list *t); 184 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa); 185 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa); 186 187 static void inet6_prefix_notify(int event, struct inet6_dev *idev, 188 struct prefix_info *pinfo); 189 190 static struct ipv6_devconf ipv6_devconf __read_mostly = { 191 .forwarding = 0, 192 .hop_limit = IPV6_DEFAULT_HOPLIMIT, 193 .mtu6 = IPV6_MIN_MTU, 194 .accept_ra = 1, 195 .accept_redirects = 1, 196 .autoconf = 1, 197 .force_mld_version = 0, 198 .mldv1_unsolicited_report_interval = 10 * HZ, 199 .mldv2_unsolicited_report_interval = HZ, 200 .dad_transmits = 1, 201 .rtr_solicits = MAX_RTR_SOLICITATIONS, 202 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL, 203 .rtr_solicit_max_interval = RTR_SOLICITATION_MAX_INTERVAL, 204 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY, 205 .use_tempaddr = 0, 206 .temp_valid_lft = TEMP_VALID_LIFETIME, 207 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME, 208 .regen_max_retry = REGEN_MAX_RETRY, 209 .max_desync_factor = MAX_DESYNC_FACTOR, 210 .max_addresses = IPV6_MAX_ADDRESSES, 211 .accept_ra_defrtr = 1, 212 .accept_ra_from_local = 0, 213 .accept_ra_min_hop_limit= 1, 214 .accept_ra_pinfo = 1, 215 #ifdef CONFIG_IPV6_ROUTER_PREF 216 .accept_ra_rtr_pref = 1, 217 .rtr_probe_interval = 60 * HZ, 218 #ifdef CONFIG_IPV6_ROUTE_INFO 219 .accept_ra_rt_info_min_plen = 0, 220 .accept_ra_rt_info_max_plen = 0, 221 #endif 222 #endif 223 .proxy_ndp = 0, 224 .accept_source_route = 0, /* we do not accept RH0 by default. */ 225 .disable_ipv6 = 0, 226 .accept_dad = 0, 227 .suppress_frag_ndisc = 1, 228 .accept_ra_mtu = 1, 229 .stable_secret = { 230 .initialized = false, 231 }, 232 .use_oif_addrs_only = 0, 233 .ignore_routes_with_linkdown = 0, 234 .keep_addr_on_down = 0, 235 .seg6_enabled = 0, 236 #ifdef CONFIG_IPV6_SEG6_HMAC 237 .seg6_require_hmac = 0, 238 #endif 239 .enhanced_dad = 1, 240 .addr_gen_mode = IN6_ADDR_GEN_MODE_EUI64, 241 .disable_policy = 0, 242 }; 243 244 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = { 245 .forwarding = 0, 246 .hop_limit = IPV6_DEFAULT_HOPLIMIT, 247 .mtu6 = IPV6_MIN_MTU, 248 .accept_ra = 1, 249 .accept_redirects = 1, 250 .autoconf = 1, 251 .force_mld_version = 0, 252 .mldv1_unsolicited_report_interval = 10 * HZ, 253 .mldv2_unsolicited_report_interval = HZ, 254 .dad_transmits = 1, 255 .rtr_solicits = MAX_RTR_SOLICITATIONS, 256 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL, 257 .rtr_solicit_max_interval = RTR_SOLICITATION_MAX_INTERVAL, 258 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY, 259 .use_tempaddr = 0, 260 .temp_valid_lft = TEMP_VALID_LIFETIME, 261 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME, 262 .regen_max_retry = REGEN_MAX_RETRY, 263 .max_desync_factor = MAX_DESYNC_FACTOR, 264 .max_addresses = IPV6_MAX_ADDRESSES, 265 .accept_ra_defrtr = 1, 266 .accept_ra_from_local = 0, 267 .accept_ra_min_hop_limit= 1, 268 .accept_ra_pinfo = 1, 269 #ifdef CONFIG_IPV6_ROUTER_PREF 270 .accept_ra_rtr_pref = 1, 271 .rtr_probe_interval = 60 * HZ, 272 #ifdef CONFIG_IPV6_ROUTE_INFO 273 .accept_ra_rt_info_min_plen = 0, 274 .accept_ra_rt_info_max_plen = 0, 275 #endif 276 #endif 277 .proxy_ndp = 0, 278 .accept_source_route = 0, /* we do not accept RH0 by default. */ 279 .disable_ipv6 = 0, 280 .accept_dad = 1, 281 .suppress_frag_ndisc = 1, 282 .accept_ra_mtu = 1, 283 .stable_secret = { 284 .initialized = false, 285 }, 286 .use_oif_addrs_only = 0, 287 .ignore_routes_with_linkdown = 0, 288 .keep_addr_on_down = 0, 289 .seg6_enabled = 0, 290 #ifdef CONFIG_IPV6_SEG6_HMAC 291 .seg6_require_hmac = 0, 292 #endif 293 .enhanced_dad = 1, 294 .addr_gen_mode = IN6_ADDR_GEN_MODE_EUI64, 295 .disable_policy = 0, 296 }; 297 298 /* Check if link is ready: is it up and is a valid qdisc available */ 299 static inline bool addrconf_link_ready(const struct net_device *dev) 300 { 301 return netif_oper_up(dev) && !qdisc_tx_is_noop(dev); 302 } 303 304 static void addrconf_del_rs_timer(struct inet6_dev *idev) 305 { 306 if (del_timer(&idev->rs_timer)) 307 __in6_dev_put(idev); 308 } 309 310 static void addrconf_del_dad_work(struct inet6_ifaddr *ifp) 311 { 312 if (cancel_delayed_work(&ifp->dad_work)) 313 __in6_ifa_put(ifp); 314 } 315 316 static void addrconf_mod_rs_timer(struct inet6_dev *idev, 317 unsigned long when) 318 { 319 if (!timer_pending(&idev->rs_timer)) 320 in6_dev_hold(idev); 321 mod_timer(&idev->rs_timer, jiffies + when); 322 } 323 324 static void addrconf_mod_dad_work(struct inet6_ifaddr *ifp, 325 unsigned long delay) 326 { 327 in6_ifa_hold(ifp); 328 if (mod_delayed_work(addrconf_wq, &ifp->dad_work, delay)) 329 in6_ifa_put(ifp); 330 } 331 332 static int snmp6_alloc_dev(struct inet6_dev *idev) 333 { 334 int i; 335 336 idev->stats.ipv6 = alloc_percpu(struct ipstats_mib); 337 if (!idev->stats.ipv6) 338 goto err_ip; 339 340 for_each_possible_cpu(i) { 341 struct ipstats_mib *addrconf_stats; 342 addrconf_stats = per_cpu_ptr(idev->stats.ipv6, i); 343 u64_stats_init(&addrconf_stats->syncp); 344 } 345 346 347 idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device), 348 GFP_KERNEL); 349 if (!idev->stats.icmpv6dev) 350 goto err_icmp; 351 idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device), 352 GFP_KERNEL); 353 if (!idev->stats.icmpv6msgdev) 354 goto err_icmpmsg; 355 356 return 0; 357 358 err_icmpmsg: 359 kfree(idev->stats.icmpv6dev); 360 err_icmp: 361 free_percpu(idev->stats.ipv6); 362 err_ip: 363 return -ENOMEM; 364 } 365 366 static struct inet6_dev *ipv6_add_dev(struct net_device *dev) 367 { 368 struct inet6_dev *ndev; 369 int err = -ENOMEM; 370 371 ASSERT_RTNL(); 372 373 if (dev->mtu < IPV6_MIN_MTU) 374 return ERR_PTR(-EINVAL); 375 376 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL); 377 if (!ndev) 378 return ERR_PTR(err); 379 380 rwlock_init(&ndev->lock); 381 ndev->dev = dev; 382 INIT_LIST_HEAD(&ndev->addr_list); 383 timer_setup(&ndev->rs_timer, addrconf_rs_timer, 0); 384 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf)); 385 386 if (ndev->cnf.stable_secret.initialized) 387 ndev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY; 388 389 ndev->cnf.mtu6 = dev->mtu; 390 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl); 391 if (!ndev->nd_parms) { 392 kfree(ndev); 393 return ERR_PTR(err); 394 } 395 if (ndev->cnf.forwarding) 396 dev_disable_lro(dev); 397 /* We refer to the device */ 398 dev_hold(dev); 399 400 if (snmp6_alloc_dev(ndev) < 0) { 401 netdev_dbg(dev, "%s: cannot allocate memory for statistics\n", 402 __func__); 403 neigh_parms_release(&nd_tbl, ndev->nd_parms); 404 dev_put(dev); 405 kfree(ndev); 406 return ERR_PTR(err); 407 } 408 409 if (snmp6_register_dev(ndev) < 0) { 410 netdev_dbg(dev, "%s: cannot create /proc/net/dev_snmp6/%s\n", 411 __func__, dev->name); 412 goto err_release; 413 } 414 415 /* One reference from device. */ 416 refcount_set(&ndev->refcnt, 1); 417 418 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK)) 419 ndev->cnf.accept_dad = -1; 420 421 #if IS_ENABLED(CONFIG_IPV6_SIT) 422 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) { 423 pr_info("%s: Disabled Multicast RS\n", dev->name); 424 ndev->cnf.rtr_solicits = 0; 425 } 426 #endif 427 428 INIT_LIST_HEAD(&ndev->tempaddr_list); 429 ndev->desync_factor = U32_MAX; 430 if ((dev->flags&IFF_LOOPBACK) || 431 dev->type == ARPHRD_TUNNEL || 432 dev->type == ARPHRD_TUNNEL6 || 433 dev->type == ARPHRD_SIT || 434 dev->type == ARPHRD_NONE) { 435 ndev->cnf.use_tempaddr = -1; 436 } else 437 ipv6_regen_rndid(ndev); 438 439 ndev->token = in6addr_any; 440 441 if (netif_running(dev) && addrconf_link_ready(dev)) 442 ndev->if_flags |= IF_READY; 443 444 ipv6_mc_init_dev(ndev); 445 ndev->tstamp = jiffies; 446 err = addrconf_sysctl_register(ndev); 447 if (err) { 448 ipv6_mc_destroy_dev(ndev); 449 snmp6_unregister_dev(ndev); 450 goto err_release; 451 } 452 /* protected by rtnl_lock */ 453 rcu_assign_pointer(dev->ip6_ptr, ndev); 454 455 /* Join interface-local all-node multicast group */ 456 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allnodes); 457 458 /* Join all-node multicast group */ 459 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes); 460 461 /* Join all-router multicast group if forwarding is set */ 462 if (ndev->cnf.forwarding && (dev->flags & IFF_MULTICAST)) 463 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters); 464 465 return ndev; 466 467 err_release: 468 neigh_parms_release(&nd_tbl, ndev->nd_parms); 469 ndev->dead = 1; 470 in6_dev_finish_destroy(ndev); 471 return ERR_PTR(err); 472 } 473 474 static struct inet6_dev *ipv6_find_idev(struct net_device *dev) 475 { 476 struct inet6_dev *idev; 477 478 ASSERT_RTNL(); 479 480 idev = __in6_dev_get(dev); 481 if (!idev) { 482 idev = ipv6_add_dev(dev); 483 if (IS_ERR(idev)) 484 return NULL; 485 } 486 487 if (dev->flags&IFF_UP) 488 ipv6_mc_up(idev); 489 return idev; 490 } 491 492 static int inet6_netconf_msgsize_devconf(int type) 493 { 494 int size = NLMSG_ALIGN(sizeof(struct netconfmsg)) 495 + nla_total_size(4); /* NETCONFA_IFINDEX */ 496 bool all = false; 497 498 if (type == NETCONFA_ALL) 499 all = true; 500 501 if (all || type == NETCONFA_FORWARDING) 502 size += nla_total_size(4); 503 #ifdef CONFIG_IPV6_MROUTE 504 if (all || type == NETCONFA_MC_FORWARDING) 505 size += nla_total_size(4); 506 #endif 507 if (all || type == NETCONFA_PROXY_NEIGH) 508 size += nla_total_size(4); 509 510 if (all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN) 511 size += nla_total_size(4); 512 513 return size; 514 } 515 516 static int inet6_netconf_fill_devconf(struct sk_buff *skb, int ifindex, 517 struct ipv6_devconf *devconf, u32 portid, 518 u32 seq, int event, unsigned int flags, 519 int type) 520 { 521 struct nlmsghdr *nlh; 522 struct netconfmsg *ncm; 523 bool all = false; 524 525 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg), 526 flags); 527 if (!nlh) 528 return -EMSGSIZE; 529 530 if (type == NETCONFA_ALL) 531 all = true; 532 533 ncm = nlmsg_data(nlh); 534 ncm->ncm_family = AF_INET6; 535 536 if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0) 537 goto nla_put_failure; 538 539 if (!devconf) 540 goto out; 541 542 if ((all || type == NETCONFA_FORWARDING) && 543 nla_put_s32(skb, NETCONFA_FORWARDING, devconf->forwarding) < 0) 544 goto nla_put_failure; 545 #ifdef CONFIG_IPV6_MROUTE 546 if ((all || type == NETCONFA_MC_FORWARDING) && 547 nla_put_s32(skb, NETCONFA_MC_FORWARDING, 548 devconf->mc_forwarding) < 0) 549 goto nla_put_failure; 550 #endif 551 if ((all || type == NETCONFA_PROXY_NEIGH) && 552 nla_put_s32(skb, NETCONFA_PROXY_NEIGH, devconf->proxy_ndp) < 0) 553 goto nla_put_failure; 554 555 if ((all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN) && 556 nla_put_s32(skb, NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN, 557 devconf->ignore_routes_with_linkdown) < 0) 558 goto nla_put_failure; 559 560 out: 561 nlmsg_end(skb, nlh); 562 return 0; 563 564 nla_put_failure: 565 nlmsg_cancel(skb, nlh); 566 return -EMSGSIZE; 567 } 568 569 void inet6_netconf_notify_devconf(struct net *net, int event, int type, 570 int ifindex, struct ipv6_devconf *devconf) 571 { 572 struct sk_buff *skb; 573 int err = -ENOBUFS; 574 575 skb = nlmsg_new(inet6_netconf_msgsize_devconf(type), GFP_KERNEL); 576 if (!skb) 577 goto errout; 578 579 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 0, 0, 580 event, 0, type); 581 if (err < 0) { 582 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */ 583 WARN_ON(err == -EMSGSIZE); 584 kfree_skb(skb); 585 goto errout; 586 } 587 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_NETCONF, NULL, GFP_KERNEL); 588 return; 589 errout: 590 rtnl_set_sk_err(net, RTNLGRP_IPV6_NETCONF, err); 591 } 592 593 static const struct nla_policy devconf_ipv6_policy[NETCONFA_MAX+1] = { 594 [NETCONFA_IFINDEX] = { .len = sizeof(int) }, 595 [NETCONFA_FORWARDING] = { .len = sizeof(int) }, 596 [NETCONFA_PROXY_NEIGH] = { .len = sizeof(int) }, 597 [NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN] = { .len = sizeof(int) }, 598 }; 599 600 static int inet6_netconf_valid_get_req(struct sk_buff *skb, 601 const struct nlmsghdr *nlh, 602 struct nlattr **tb, 603 struct netlink_ext_ack *extack) 604 { 605 int i, err; 606 607 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(struct netconfmsg))) { 608 NL_SET_ERR_MSG_MOD(extack, "Invalid header for netconf get request"); 609 return -EINVAL; 610 } 611 612 if (!netlink_strict_get_check(skb)) 613 return nlmsg_parse(nlh, sizeof(struct netconfmsg), tb, 614 NETCONFA_MAX, devconf_ipv6_policy, extack); 615 616 err = nlmsg_parse_strict(nlh, sizeof(struct netconfmsg), tb, 617 NETCONFA_MAX, devconf_ipv6_policy, extack); 618 if (err) 619 return err; 620 621 for (i = 0; i <= NETCONFA_MAX; i++) { 622 if (!tb[i]) 623 continue; 624 625 switch (i) { 626 case NETCONFA_IFINDEX: 627 break; 628 default: 629 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in netconf get request"); 630 return -EINVAL; 631 } 632 } 633 634 return 0; 635 } 636 637 static int inet6_netconf_get_devconf(struct sk_buff *in_skb, 638 struct nlmsghdr *nlh, 639 struct netlink_ext_ack *extack) 640 { 641 struct net *net = sock_net(in_skb->sk); 642 struct nlattr *tb[NETCONFA_MAX+1]; 643 struct inet6_dev *in6_dev = NULL; 644 struct net_device *dev = NULL; 645 struct sk_buff *skb; 646 struct ipv6_devconf *devconf; 647 int ifindex; 648 int err; 649 650 err = inet6_netconf_valid_get_req(in_skb, nlh, tb, extack); 651 if (err < 0) 652 return err; 653 654 if (!tb[NETCONFA_IFINDEX]) 655 return -EINVAL; 656 657 err = -EINVAL; 658 ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]); 659 switch (ifindex) { 660 case NETCONFA_IFINDEX_ALL: 661 devconf = net->ipv6.devconf_all; 662 break; 663 case NETCONFA_IFINDEX_DEFAULT: 664 devconf = net->ipv6.devconf_dflt; 665 break; 666 default: 667 dev = dev_get_by_index(net, ifindex); 668 if (!dev) 669 return -EINVAL; 670 in6_dev = in6_dev_get(dev); 671 if (!in6_dev) 672 goto errout; 673 devconf = &in6_dev->cnf; 674 break; 675 } 676 677 err = -ENOBUFS; 678 skb = nlmsg_new(inet6_netconf_msgsize_devconf(NETCONFA_ALL), GFP_KERNEL); 679 if (!skb) 680 goto errout; 681 682 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 683 NETLINK_CB(in_skb).portid, 684 nlh->nlmsg_seq, RTM_NEWNETCONF, 0, 685 NETCONFA_ALL); 686 if (err < 0) { 687 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */ 688 WARN_ON(err == -EMSGSIZE); 689 kfree_skb(skb); 690 goto errout; 691 } 692 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid); 693 errout: 694 if (in6_dev) 695 in6_dev_put(in6_dev); 696 if (dev) 697 dev_put(dev); 698 return err; 699 } 700 701 static int inet6_netconf_dump_devconf(struct sk_buff *skb, 702 struct netlink_callback *cb) 703 { 704 const struct nlmsghdr *nlh = cb->nlh; 705 struct net *net = sock_net(skb->sk); 706 int h, s_h; 707 int idx, s_idx; 708 struct net_device *dev; 709 struct inet6_dev *idev; 710 struct hlist_head *head; 711 712 if (cb->strict_check) { 713 struct netlink_ext_ack *extack = cb->extack; 714 struct netconfmsg *ncm; 715 716 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ncm))) { 717 NL_SET_ERR_MSG_MOD(extack, "Invalid header for netconf dump request"); 718 return -EINVAL; 719 } 720 721 if (nlmsg_attrlen(nlh, sizeof(*ncm))) { 722 NL_SET_ERR_MSG_MOD(extack, "Invalid data after header in netconf dump request"); 723 return -EINVAL; 724 } 725 } 726 727 s_h = cb->args[0]; 728 s_idx = idx = cb->args[1]; 729 730 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 731 idx = 0; 732 head = &net->dev_index_head[h]; 733 rcu_read_lock(); 734 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ 735 net->dev_base_seq; 736 hlist_for_each_entry_rcu(dev, head, index_hlist) { 737 if (idx < s_idx) 738 goto cont; 739 idev = __in6_dev_get(dev); 740 if (!idev) 741 goto cont; 742 743 if (inet6_netconf_fill_devconf(skb, dev->ifindex, 744 &idev->cnf, 745 NETLINK_CB(cb->skb).portid, 746 nlh->nlmsg_seq, 747 RTM_NEWNETCONF, 748 NLM_F_MULTI, 749 NETCONFA_ALL) < 0) { 750 rcu_read_unlock(); 751 goto done; 752 } 753 nl_dump_check_consistent(cb, nlmsg_hdr(skb)); 754 cont: 755 idx++; 756 } 757 rcu_read_unlock(); 758 } 759 if (h == NETDEV_HASHENTRIES) { 760 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL, 761 net->ipv6.devconf_all, 762 NETLINK_CB(cb->skb).portid, 763 nlh->nlmsg_seq, 764 RTM_NEWNETCONF, NLM_F_MULTI, 765 NETCONFA_ALL) < 0) 766 goto done; 767 else 768 h++; 769 } 770 if (h == NETDEV_HASHENTRIES + 1) { 771 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT, 772 net->ipv6.devconf_dflt, 773 NETLINK_CB(cb->skb).portid, 774 nlh->nlmsg_seq, 775 RTM_NEWNETCONF, NLM_F_MULTI, 776 NETCONFA_ALL) < 0) 777 goto done; 778 else 779 h++; 780 } 781 done: 782 cb->args[0] = h; 783 cb->args[1] = idx; 784 785 return skb->len; 786 } 787 788 #ifdef CONFIG_SYSCTL 789 static void dev_forward_change(struct inet6_dev *idev) 790 { 791 struct net_device *dev; 792 struct inet6_ifaddr *ifa; 793 794 if (!idev) 795 return; 796 dev = idev->dev; 797 if (idev->cnf.forwarding) 798 dev_disable_lro(dev); 799 if (dev->flags & IFF_MULTICAST) { 800 if (idev->cnf.forwarding) { 801 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters); 802 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allrouters); 803 ipv6_dev_mc_inc(dev, &in6addr_sitelocal_allrouters); 804 } else { 805 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters); 806 ipv6_dev_mc_dec(dev, &in6addr_interfacelocal_allrouters); 807 ipv6_dev_mc_dec(dev, &in6addr_sitelocal_allrouters); 808 } 809 } 810 811 list_for_each_entry(ifa, &idev->addr_list, if_list) { 812 if (ifa->flags&IFA_F_TENTATIVE) 813 continue; 814 if (idev->cnf.forwarding) 815 addrconf_join_anycast(ifa); 816 else 817 addrconf_leave_anycast(ifa); 818 } 819 inet6_netconf_notify_devconf(dev_net(dev), RTM_NEWNETCONF, 820 NETCONFA_FORWARDING, 821 dev->ifindex, &idev->cnf); 822 } 823 824 825 static void addrconf_forward_change(struct net *net, __s32 newf) 826 { 827 struct net_device *dev; 828 struct inet6_dev *idev; 829 830 for_each_netdev(net, dev) { 831 idev = __in6_dev_get(dev); 832 if (idev) { 833 int changed = (!idev->cnf.forwarding) ^ (!newf); 834 idev->cnf.forwarding = newf; 835 if (changed) 836 dev_forward_change(idev); 837 } 838 } 839 } 840 841 static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf) 842 { 843 struct net *net; 844 int old; 845 846 if (!rtnl_trylock()) 847 return restart_syscall(); 848 849 net = (struct net *)table->extra2; 850 old = *p; 851 *p = newf; 852 853 if (p == &net->ipv6.devconf_dflt->forwarding) { 854 if ((!newf) ^ (!old)) 855 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 856 NETCONFA_FORWARDING, 857 NETCONFA_IFINDEX_DEFAULT, 858 net->ipv6.devconf_dflt); 859 rtnl_unlock(); 860 return 0; 861 } 862 863 if (p == &net->ipv6.devconf_all->forwarding) { 864 int old_dflt = net->ipv6.devconf_dflt->forwarding; 865 866 net->ipv6.devconf_dflt->forwarding = newf; 867 if ((!newf) ^ (!old_dflt)) 868 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 869 NETCONFA_FORWARDING, 870 NETCONFA_IFINDEX_DEFAULT, 871 net->ipv6.devconf_dflt); 872 873 addrconf_forward_change(net, newf); 874 if ((!newf) ^ (!old)) 875 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 876 NETCONFA_FORWARDING, 877 NETCONFA_IFINDEX_ALL, 878 net->ipv6.devconf_all); 879 } else if ((!newf) ^ (!old)) 880 dev_forward_change((struct inet6_dev *)table->extra1); 881 rtnl_unlock(); 882 883 if (newf) 884 rt6_purge_dflt_routers(net); 885 return 1; 886 } 887 888 static void addrconf_linkdown_change(struct net *net, __s32 newf) 889 { 890 struct net_device *dev; 891 struct inet6_dev *idev; 892 893 for_each_netdev(net, dev) { 894 idev = __in6_dev_get(dev); 895 if (idev) { 896 int changed = (!idev->cnf.ignore_routes_with_linkdown) ^ (!newf); 897 898 idev->cnf.ignore_routes_with_linkdown = newf; 899 if (changed) 900 inet6_netconf_notify_devconf(dev_net(dev), 901 RTM_NEWNETCONF, 902 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN, 903 dev->ifindex, 904 &idev->cnf); 905 } 906 } 907 } 908 909 static int addrconf_fixup_linkdown(struct ctl_table *table, int *p, int newf) 910 { 911 struct net *net; 912 int old; 913 914 if (!rtnl_trylock()) 915 return restart_syscall(); 916 917 net = (struct net *)table->extra2; 918 old = *p; 919 *p = newf; 920 921 if (p == &net->ipv6.devconf_dflt->ignore_routes_with_linkdown) { 922 if ((!newf) ^ (!old)) 923 inet6_netconf_notify_devconf(net, 924 RTM_NEWNETCONF, 925 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN, 926 NETCONFA_IFINDEX_DEFAULT, 927 net->ipv6.devconf_dflt); 928 rtnl_unlock(); 929 return 0; 930 } 931 932 if (p == &net->ipv6.devconf_all->ignore_routes_with_linkdown) { 933 net->ipv6.devconf_dflt->ignore_routes_with_linkdown = newf; 934 addrconf_linkdown_change(net, newf); 935 if ((!newf) ^ (!old)) 936 inet6_netconf_notify_devconf(net, 937 RTM_NEWNETCONF, 938 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN, 939 NETCONFA_IFINDEX_ALL, 940 net->ipv6.devconf_all); 941 } 942 rtnl_unlock(); 943 944 return 1; 945 } 946 947 #endif 948 949 /* Nobody refers to this ifaddr, destroy it */ 950 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp) 951 { 952 WARN_ON(!hlist_unhashed(&ifp->addr_lst)); 953 954 #ifdef NET_REFCNT_DEBUG 955 pr_debug("%s\n", __func__); 956 #endif 957 958 in6_dev_put(ifp->idev); 959 960 if (cancel_delayed_work(&ifp->dad_work)) 961 pr_notice("delayed DAD work was pending while freeing ifa=%p\n", 962 ifp); 963 964 if (ifp->state != INET6_IFADDR_STATE_DEAD) { 965 pr_warn("Freeing alive inet6 address %p\n", ifp); 966 return; 967 } 968 969 kfree_rcu(ifp, rcu); 970 } 971 972 static void 973 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp) 974 { 975 struct list_head *p; 976 int ifp_scope = ipv6_addr_src_scope(&ifp->addr); 977 978 /* 979 * Each device address list is sorted in order of scope - 980 * global before linklocal. 981 */ 982 list_for_each(p, &idev->addr_list) { 983 struct inet6_ifaddr *ifa 984 = list_entry(p, struct inet6_ifaddr, if_list); 985 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr)) 986 break; 987 } 988 989 list_add_tail_rcu(&ifp->if_list, p); 990 } 991 992 static u32 inet6_addr_hash(const struct net *net, const struct in6_addr *addr) 993 { 994 u32 val = ipv6_addr_hash(addr) ^ net_hash_mix(net); 995 996 return hash_32(val, IN6_ADDR_HSIZE_SHIFT); 997 } 998 999 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr, 1000 struct net_device *dev, unsigned int hash) 1001 { 1002 struct inet6_ifaddr *ifp; 1003 1004 hlist_for_each_entry(ifp, &inet6_addr_lst[hash], addr_lst) { 1005 if (!net_eq(dev_net(ifp->idev->dev), net)) 1006 continue; 1007 if (ipv6_addr_equal(&ifp->addr, addr)) { 1008 if (!dev || ifp->idev->dev == dev) 1009 return true; 1010 } 1011 } 1012 return false; 1013 } 1014 1015 static int ipv6_add_addr_hash(struct net_device *dev, struct inet6_ifaddr *ifa) 1016 { 1017 unsigned int hash = inet6_addr_hash(dev_net(dev), &ifa->addr); 1018 int err = 0; 1019 1020 spin_lock(&addrconf_hash_lock); 1021 1022 /* Ignore adding duplicate addresses on an interface */ 1023 if (ipv6_chk_same_addr(dev_net(dev), &ifa->addr, dev, hash)) { 1024 netdev_dbg(dev, "ipv6_add_addr: already assigned\n"); 1025 err = -EEXIST; 1026 } else { 1027 hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]); 1028 } 1029 1030 spin_unlock(&addrconf_hash_lock); 1031 1032 return err; 1033 } 1034 1035 /* On success it returns ifp with increased reference count */ 1036 1037 static struct inet6_ifaddr * 1038 ipv6_add_addr(struct inet6_dev *idev, struct ifa6_config *cfg, 1039 bool can_block, struct netlink_ext_ack *extack) 1040 { 1041 gfp_t gfp_flags = can_block ? GFP_KERNEL : GFP_ATOMIC; 1042 int addr_type = ipv6_addr_type(cfg->pfx); 1043 struct net *net = dev_net(idev->dev); 1044 struct inet6_ifaddr *ifa = NULL; 1045 struct fib6_info *f6i = NULL; 1046 int err = 0; 1047 1048 if (addr_type == IPV6_ADDR_ANY || 1049 addr_type & IPV6_ADDR_MULTICAST || 1050 (!(idev->dev->flags & IFF_LOOPBACK) && 1051 !netif_is_l3_master(idev->dev) && 1052 addr_type & IPV6_ADDR_LOOPBACK)) 1053 return ERR_PTR(-EADDRNOTAVAIL); 1054 1055 if (idev->dead) { 1056 err = -ENODEV; /*XXX*/ 1057 goto out; 1058 } 1059 1060 if (idev->cnf.disable_ipv6) { 1061 err = -EACCES; 1062 goto out; 1063 } 1064 1065 /* validator notifier needs to be blocking; 1066 * do not call in atomic context 1067 */ 1068 if (can_block) { 1069 struct in6_validator_info i6vi = { 1070 .i6vi_addr = *cfg->pfx, 1071 .i6vi_dev = idev, 1072 .extack = extack, 1073 }; 1074 1075 err = inet6addr_validator_notifier_call_chain(NETDEV_UP, &i6vi); 1076 err = notifier_to_errno(err); 1077 if (err < 0) 1078 goto out; 1079 } 1080 1081 ifa = kzalloc(sizeof(*ifa), gfp_flags); 1082 if (!ifa) { 1083 err = -ENOBUFS; 1084 goto out; 1085 } 1086 1087 f6i = addrconf_f6i_alloc(net, idev, cfg->pfx, false, gfp_flags); 1088 if (IS_ERR(f6i)) { 1089 err = PTR_ERR(f6i); 1090 f6i = NULL; 1091 goto out; 1092 } 1093 1094 if (net->ipv6.devconf_all->disable_policy || 1095 idev->cnf.disable_policy) 1096 f6i->dst_nopolicy = true; 1097 1098 neigh_parms_data_state_setall(idev->nd_parms); 1099 1100 ifa->addr = *cfg->pfx; 1101 if (cfg->peer_pfx) 1102 ifa->peer_addr = *cfg->peer_pfx; 1103 1104 spin_lock_init(&ifa->lock); 1105 INIT_DELAYED_WORK(&ifa->dad_work, addrconf_dad_work); 1106 INIT_HLIST_NODE(&ifa->addr_lst); 1107 ifa->scope = cfg->scope; 1108 ifa->prefix_len = cfg->plen; 1109 ifa->rt_priority = cfg->rt_priority; 1110 ifa->flags = cfg->ifa_flags; 1111 /* No need to add the TENTATIVE flag for addresses with NODAD */ 1112 if (!(cfg->ifa_flags & IFA_F_NODAD)) 1113 ifa->flags |= IFA_F_TENTATIVE; 1114 ifa->valid_lft = cfg->valid_lft; 1115 ifa->prefered_lft = cfg->preferred_lft; 1116 ifa->cstamp = ifa->tstamp = jiffies; 1117 ifa->tokenized = false; 1118 1119 ifa->rt = f6i; 1120 1121 ifa->idev = idev; 1122 in6_dev_hold(idev); 1123 1124 /* For caller */ 1125 refcount_set(&ifa->refcnt, 1); 1126 1127 rcu_read_lock_bh(); 1128 1129 err = ipv6_add_addr_hash(idev->dev, ifa); 1130 if (err < 0) { 1131 rcu_read_unlock_bh(); 1132 goto out; 1133 } 1134 1135 write_lock(&idev->lock); 1136 1137 /* Add to inet6_dev unicast addr list. */ 1138 ipv6_link_dev_addr(idev, ifa); 1139 1140 if (ifa->flags&IFA_F_TEMPORARY) { 1141 list_add(&ifa->tmp_list, &idev->tempaddr_list); 1142 in6_ifa_hold(ifa); 1143 } 1144 1145 in6_ifa_hold(ifa); 1146 write_unlock(&idev->lock); 1147 1148 rcu_read_unlock_bh(); 1149 1150 inet6addr_notifier_call_chain(NETDEV_UP, ifa); 1151 out: 1152 if (unlikely(err < 0)) { 1153 fib6_info_release(f6i); 1154 1155 if (ifa) { 1156 if (ifa->idev) 1157 in6_dev_put(ifa->idev); 1158 kfree(ifa); 1159 } 1160 ifa = ERR_PTR(err); 1161 } 1162 1163 return ifa; 1164 } 1165 1166 enum cleanup_prefix_rt_t { 1167 CLEANUP_PREFIX_RT_NOP, /* no cleanup action for prefix route */ 1168 CLEANUP_PREFIX_RT_DEL, /* delete the prefix route */ 1169 CLEANUP_PREFIX_RT_EXPIRE, /* update the lifetime of the prefix route */ 1170 }; 1171 1172 /* 1173 * Check, whether the prefix for ifp would still need a prefix route 1174 * after deleting ifp. The function returns one of the CLEANUP_PREFIX_RT_* 1175 * constants. 1176 * 1177 * 1) we don't purge prefix if address was not permanent. 1178 * prefix is managed by its own lifetime. 1179 * 2) we also don't purge, if the address was IFA_F_NOPREFIXROUTE. 1180 * 3) if there are no addresses, delete prefix. 1181 * 4) if there are still other permanent address(es), 1182 * corresponding prefix is still permanent. 1183 * 5) if there are still other addresses with IFA_F_NOPREFIXROUTE, 1184 * don't purge the prefix, assume user space is managing it. 1185 * 6) otherwise, update prefix lifetime to the 1186 * longest valid lifetime among the corresponding 1187 * addresses on the device. 1188 * Note: subsequent RA will update lifetime. 1189 **/ 1190 static enum cleanup_prefix_rt_t 1191 check_cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long *expires) 1192 { 1193 struct inet6_ifaddr *ifa; 1194 struct inet6_dev *idev = ifp->idev; 1195 unsigned long lifetime; 1196 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_DEL; 1197 1198 *expires = jiffies; 1199 1200 list_for_each_entry(ifa, &idev->addr_list, if_list) { 1201 if (ifa == ifp) 1202 continue; 1203 if (ifa->prefix_len != ifp->prefix_len || 1204 !ipv6_prefix_equal(&ifa->addr, &ifp->addr, 1205 ifp->prefix_len)) 1206 continue; 1207 if (ifa->flags & (IFA_F_PERMANENT | IFA_F_NOPREFIXROUTE)) 1208 return CLEANUP_PREFIX_RT_NOP; 1209 1210 action = CLEANUP_PREFIX_RT_EXPIRE; 1211 1212 spin_lock(&ifa->lock); 1213 1214 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ); 1215 /* 1216 * Note: Because this address is 1217 * not permanent, lifetime < 1218 * LONG_MAX / HZ here. 1219 */ 1220 if (time_before(*expires, ifa->tstamp + lifetime * HZ)) 1221 *expires = ifa->tstamp + lifetime * HZ; 1222 spin_unlock(&ifa->lock); 1223 } 1224 1225 return action; 1226 } 1227 1228 static void 1229 cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long expires, bool del_rt) 1230 { 1231 struct fib6_info *f6i; 1232 1233 f6i = addrconf_get_prefix_route(&ifp->addr, 1234 ifp->prefix_len, 1235 ifp->idev->dev, 1236 0, RTF_GATEWAY | RTF_DEFAULT); 1237 if (f6i) { 1238 if (del_rt) 1239 ip6_del_rt(dev_net(ifp->idev->dev), f6i); 1240 else { 1241 if (!(f6i->fib6_flags & RTF_EXPIRES)) 1242 fib6_set_expires(f6i, expires); 1243 fib6_info_release(f6i); 1244 } 1245 } 1246 } 1247 1248 1249 /* This function wants to get referenced ifp and releases it before return */ 1250 1251 static void ipv6_del_addr(struct inet6_ifaddr *ifp) 1252 { 1253 int state; 1254 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_NOP; 1255 unsigned long expires; 1256 1257 ASSERT_RTNL(); 1258 1259 spin_lock_bh(&ifp->lock); 1260 state = ifp->state; 1261 ifp->state = INET6_IFADDR_STATE_DEAD; 1262 spin_unlock_bh(&ifp->lock); 1263 1264 if (state == INET6_IFADDR_STATE_DEAD) 1265 goto out; 1266 1267 spin_lock_bh(&addrconf_hash_lock); 1268 hlist_del_init_rcu(&ifp->addr_lst); 1269 spin_unlock_bh(&addrconf_hash_lock); 1270 1271 write_lock_bh(&ifp->idev->lock); 1272 1273 if (ifp->flags&IFA_F_TEMPORARY) { 1274 list_del(&ifp->tmp_list); 1275 if (ifp->ifpub) { 1276 in6_ifa_put(ifp->ifpub); 1277 ifp->ifpub = NULL; 1278 } 1279 __in6_ifa_put(ifp); 1280 } 1281 1282 if (ifp->flags & IFA_F_PERMANENT && !(ifp->flags & IFA_F_NOPREFIXROUTE)) 1283 action = check_cleanup_prefix_route(ifp, &expires); 1284 1285 list_del_rcu(&ifp->if_list); 1286 __in6_ifa_put(ifp); 1287 1288 write_unlock_bh(&ifp->idev->lock); 1289 1290 addrconf_del_dad_work(ifp); 1291 1292 ipv6_ifa_notify(RTM_DELADDR, ifp); 1293 1294 inet6addr_notifier_call_chain(NETDEV_DOWN, ifp); 1295 1296 if (action != CLEANUP_PREFIX_RT_NOP) { 1297 cleanup_prefix_route(ifp, expires, 1298 action == CLEANUP_PREFIX_RT_DEL); 1299 } 1300 1301 /* clean up prefsrc entries */ 1302 rt6_remove_prefsrc(ifp); 1303 out: 1304 in6_ifa_put(ifp); 1305 } 1306 1307 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, 1308 struct inet6_ifaddr *ift, 1309 bool block) 1310 { 1311 struct inet6_dev *idev = ifp->idev; 1312 struct in6_addr addr, *tmpaddr; 1313 unsigned long tmp_tstamp, age; 1314 unsigned long regen_advance; 1315 struct ifa6_config cfg; 1316 int ret = 0; 1317 unsigned long now = jiffies; 1318 long max_desync_factor; 1319 s32 cnf_temp_preferred_lft; 1320 1321 write_lock_bh(&idev->lock); 1322 if (ift) { 1323 spin_lock_bh(&ift->lock); 1324 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8); 1325 spin_unlock_bh(&ift->lock); 1326 tmpaddr = &addr; 1327 } else { 1328 tmpaddr = NULL; 1329 } 1330 retry: 1331 in6_dev_hold(idev); 1332 if (idev->cnf.use_tempaddr <= 0) { 1333 write_unlock_bh(&idev->lock); 1334 pr_info("%s: use_tempaddr is disabled\n", __func__); 1335 in6_dev_put(idev); 1336 ret = -1; 1337 goto out; 1338 } 1339 spin_lock_bh(&ifp->lock); 1340 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) { 1341 idev->cnf.use_tempaddr = -1; /*XXX*/ 1342 spin_unlock_bh(&ifp->lock); 1343 write_unlock_bh(&idev->lock); 1344 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n", 1345 __func__); 1346 in6_dev_put(idev); 1347 ret = -1; 1348 goto out; 1349 } 1350 in6_ifa_hold(ifp); 1351 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8); 1352 ipv6_try_regen_rndid(idev, tmpaddr); 1353 memcpy(&addr.s6_addr[8], idev->rndid, 8); 1354 age = (now - ifp->tstamp) / HZ; 1355 1356 regen_advance = idev->cnf.regen_max_retry * 1357 idev->cnf.dad_transmits * 1358 NEIGH_VAR(idev->nd_parms, RETRANS_TIME) / HZ; 1359 1360 /* recalculate max_desync_factor each time and update 1361 * idev->desync_factor if it's larger 1362 */ 1363 cnf_temp_preferred_lft = READ_ONCE(idev->cnf.temp_prefered_lft); 1364 max_desync_factor = min_t(__u32, 1365 idev->cnf.max_desync_factor, 1366 cnf_temp_preferred_lft - regen_advance); 1367 1368 if (unlikely(idev->desync_factor > max_desync_factor)) { 1369 if (max_desync_factor > 0) { 1370 get_random_bytes(&idev->desync_factor, 1371 sizeof(idev->desync_factor)); 1372 idev->desync_factor %= max_desync_factor; 1373 } else { 1374 idev->desync_factor = 0; 1375 } 1376 } 1377 1378 memset(&cfg, 0, sizeof(cfg)); 1379 cfg.valid_lft = min_t(__u32, ifp->valid_lft, 1380 idev->cnf.temp_valid_lft + age); 1381 cfg.preferred_lft = cnf_temp_preferred_lft + age - idev->desync_factor; 1382 cfg.preferred_lft = min_t(__u32, ifp->prefered_lft, cfg.preferred_lft); 1383 1384 cfg.plen = ifp->prefix_len; 1385 tmp_tstamp = ifp->tstamp; 1386 spin_unlock_bh(&ifp->lock); 1387 1388 write_unlock_bh(&idev->lock); 1389 1390 /* A temporary address is created only if this calculated Preferred 1391 * Lifetime is greater than REGEN_ADVANCE time units. In particular, 1392 * an implementation must not create a temporary address with a zero 1393 * Preferred Lifetime. 1394 * Use age calculation as in addrconf_verify to avoid unnecessary 1395 * temporary addresses being generated. 1396 */ 1397 age = (now - tmp_tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ; 1398 if (cfg.preferred_lft <= regen_advance + age) { 1399 in6_ifa_put(ifp); 1400 in6_dev_put(idev); 1401 ret = -1; 1402 goto out; 1403 } 1404 1405 cfg.ifa_flags = IFA_F_TEMPORARY; 1406 /* set in addrconf_prefix_rcv() */ 1407 if (ifp->flags & IFA_F_OPTIMISTIC) 1408 cfg.ifa_flags |= IFA_F_OPTIMISTIC; 1409 1410 cfg.pfx = &addr; 1411 cfg.scope = ipv6_addr_scope(cfg.pfx); 1412 1413 ift = ipv6_add_addr(idev, &cfg, block, NULL); 1414 if (IS_ERR(ift)) { 1415 in6_ifa_put(ifp); 1416 in6_dev_put(idev); 1417 pr_info("%s: retry temporary address regeneration\n", __func__); 1418 tmpaddr = &addr; 1419 write_lock_bh(&idev->lock); 1420 goto retry; 1421 } 1422 1423 spin_lock_bh(&ift->lock); 1424 ift->ifpub = ifp; 1425 ift->cstamp = now; 1426 ift->tstamp = tmp_tstamp; 1427 spin_unlock_bh(&ift->lock); 1428 1429 addrconf_dad_start(ift); 1430 in6_ifa_put(ift); 1431 in6_dev_put(idev); 1432 out: 1433 return ret; 1434 } 1435 1436 /* 1437 * Choose an appropriate source address (RFC3484) 1438 */ 1439 enum { 1440 IPV6_SADDR_RULE_INIT = 0, 1441 IPV6_SADDR_RULE_LOCAL, 1442 IPV6_SADDR_RULE_SCOPE, 1443 IPV6_SADDR_RULE_PREFERRED, 1444 #ifdef CONFIG_IPV6_MIP6 1445 IPV6_SADDR_RULE_HOA, 1446 #endif 1447 IPV6_SADDR_RULE_OIF, 1448 IPV6_SADDR_RULE_LABEL, 1449 IPV6_SADDR_RULE_PRIVACY, 1450 IPV6_SADDR_RULE_ORCHID, 1451 IPV6_SADDR_RULE_PREFIX, 1452 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1453 IPV6_SADDR_RULE_NOT_OPTIMISTIC, 1454 #endif 1455 IPV6_SADDR_RULE_MAX 1456 }; 1457 1458 struct ipv6_saddr_score { 1459 int rule; 1460 int addr_type; 1461 struct inet6_ifaddr *ifa; 1462 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX); 1463 int scopedist; 1464 int matchlen; 1465 }; 1466 1467 struct ipv6_saddr_dst { 1468 const struct in6_addr *addr; 1469 int ifindex; 1470 int scope; 1471 int label; 1472 unsigned int prefs; 1473 }; 1474 1475 static inline int ipv6_saddr_preferred(int type) 1476 { 1477 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK)) 1478 return 1; 1479 return 0; 1480 } 1481 1482 static bool ipv6_use_optimistic_addr(struct net *net, 1483 struct inet6_dev *idev) 1484 { 1485 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1486 if (!idev) 1487 return false; 1488 if (!net->ipv6.devconf_all->optimistic_dad && !idev->cnf.optimistic_dad) 1489 return false; 1490 if (!net->ipv6.devconf_all->use_optimistic && !idev->cnf.use_optimistic) 1491 return false; 1492 1493 return true; 1494 #else 1495 return false; 1496 #endif 1497 } 1498 1499 static bool ipv6_allow_optimistic_dad(struct net *net, 1500 struct inet6_dev *idev) 1501 { 1502 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1503 if (!idev) 1504 return false; 1505 if (!net->ipv6.devconf_all->optimistic_dad && !idev->cnf.optimistic_dad) 1506 return false; 1507 1508 return true; 1509 #else 1510 return false; 1511 #endif 1512 } 1513 1514 static int ipv6_get_saddr_eval(struct net *net, 1515 struct ipv6_saddr_score *score, 1516 struct ipv6_saddr_dst *dst, 1517 int i) 1518 { 1519 int ret; 1520 1521 if (i <= score->rule) { 1522 switch (i) { 1523 case IPV6_SADDR_RULE_SCOPE: 1524 ret = score->scopedist; 1525 break; 1526 case IPV6_SADDR_RULE_PREFIX: 1527 ret = score->matchlen; 1528 break; 1529 default: 1530 ret = !!test_bit(i, score->scorebits); 1531 } 1532 goto out; 1533 } 1534 1535 switch (i) { 1536 case IPV6_SADDR_RULE_INIT: 1537 /* Rule 0: remember if hiscore is not ready yet */ 1538 ret = !!score->ifa; 1539 break; 1540 case IPV6_SADDR_RULE_LOCAL: 1541 /* Rule 1: Prefer same address */ 1542 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr); 1543 break; 1544 case IPV6_SADDR_RULE_SCOPE: 1545 /* Rule 2: Prefer appropriate scope 1546 * 1547 * ret 1548 * ^ 1549 * -1 | d 15 1550 * ---+--+-+---> scope 1551 * | 1552 * | d is scope of the destination. 1553 * B-d | \ 1554 * | \ <- smaller scope is better if 1555 * B-15 | \ if scope is enough for destination. 1556 * | ret = B - scope (-1 <= scope >= d <= 15). 1557 * d-C-1 | / 1558 * |/ <- greater is better 1559 * -C / if scope is not enough for destination. 1560 * /| ret = scope - C (-1 <= d < scope <= 15). 1561 * 1562 * d - C - 1 < B -15 (for all -1 <= d <= 15). 1563 * C > d + 14 - B >= 15 + 14 - B = 29 - B. 1564 * Assume B = 0 and we get C > 29. 1565 */ 1566 ret = __ipv6_addr_src_scope(score->addr_type); 1567 if (ret >= dst->scope) 1568 ret = -ret; 1569 else 1570 ret -= 128; /* 30 is enough */ 1571 score->scopedist = ret; 1572 break; 1573 case IPV6_SADDR_RULE_PREFERRED: 1574 { 1575 /* Rule 3: Avoid deprecated and optimistic addresses */ 1576 u8 avoid = IFA_F_DEPRECATED; 1577 1578 if (!ipv6_use_optimistic_addr(net, score->ifa->idev)) 1579 avoid |= IFA_F_OPTIMISTIC; 1580 ret = ipv6_saddr_preferred(score->addr_type) || 1581 !(score->ifa->flags & avoid); 1582 break; 1583 } 1584 #ifdef CONFIG_IPV6_MIP6 1585 case IPV6_SADDR_RULE_HOA: 1586 { 1587 /* Rule 4: Prefer home address */ 1588 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA); 1589 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome; 1590 break; 1591 } 1592 #endif 1593 case IPV6_SADDR_RULE_OIF: 1594 /* Rule 5: Prefer outgoing interface */ 1595 ret = (!dst->ifindex || 1596 dst->ifindex == score->ifa->idev->dev->ifindex); 1597 break; 1598 case IPV6_SADDR_RULE_LABEL: 1599 /* Rule 6: Prefer matching label */ 1600 ret = ipv6_addr_label(net, 1601 &score->ifa->addr, score->addr_type, 1602 score->ifa->idev->dev->ifindex) == dst->label; 1603 break; 1604 case IPV6_SADDR_RULE_PRIVACY: 1605 { 1606 /* Rule 7: Prefer public address 1607 * Note: prefer temporary address if use_tempaddr >= 2 1608 */ 1609 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ? 1610 !!(dst->prefs & IPV6_PREFER_SRC_TMP) : 1611 score->ifa->idev->cnf.use_tempaddr >= 2; 1612 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp; 1613 break; 1614 } 1615 case IPV6_SADDR_RULE_ORCHID: 1616 /* Rule 8-: Prefer ORCHID vs ORCHID or 1617 * non-ORCHID vs non-ORCHID 1618 */ 1619 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^ 1620 ipv6_addr_orchid(dst->addr)); 1621 break; 1622 case IPV6_SADDR_RULE_PREFIX: 1623 /* Rule 8: Use longest matching prefix */ 1624 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr); 1625 if (ret > score->ifa->prefix_len) 1626 ret = score->ifa->prefix_len; 1627 score->matchlen = ret; 1628 break; 1629 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1630 case IPV6_SADDR_RULE_NOT_OPTIMISTIC: 1631 /* Optimistic addresses still have lower precedence than other 1632 * preferred addresses. 1633 */ 1634 ret = !(score->ifa->flags & IFA_F_OPTIMISTIC); 1635 break; 1636 #endif 1637 default: 1638 ret = 0; 1639 } 1640 1641 if (ret) 1642 __set_bit(i, score->scorebits); 1643 score->rule = i; 1644 out: 1645 return ret; 1646 } 1647 1648 static int __ipv6_dev_get_saddr(struct net *net, 1649 struct ipv6_saddr_dst *dst, 1650 struct inet6_dev *idev, 1651 struct ipv6_saddr_score *scores, 1652 int hiscore_idx) 1653 { 1654 struct ipv6_saddr_score *score = &scores[1 - hiscore_idx], *hiscore = &scores[hiscore_idx]; 1655 1656 list_for_each_entry_rcu(score->ifa, &idev->addr_list, if_list) { 1657 int i; 1658 1659 /* 1660 * - Tentative Address (RFC2462 section 5.4) 1661 * - A tentative address is not considered 1662 * "assigned to an interface" in the traditional 1663 * sense, unless it is also flagged as optimistic. 1664 * - Candidate Source Address (section 4) 1665 * - In any case, anycast addresses, multicast 1666 * addresses, and the unspecified address MUST 1667 * NOT be included in a candidate set. 1668 */ 1669 if ((score->ifa->flags & IFA_F_TENTATIVE) && 1670 (!(score->ifa->flags & IFA_F_OPTIMISTIC))) 1671 continue; 1672 1673 score->addr_type = __ipv6_addr_type(&score->ifa->addr); 1674 1675 if (unlikely(score->addr_type == IPV6_ADDR_ANY || 1676 score->addr_type & IPV6_ADDR_MULTICAST)) { 1677 net_dbg_ratelimited("ADDRCONF: unspecified / multicast address assigned as unicast address on %s", 1678 idev->dev->name); 1679 continue; 1680 } 1681 1682 score->rule = -1; 1683 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX); 1684 1685 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) { 1686 int minihiscore, miniscore; 1687 1688 minihiscore = ipv6_get_saddr_eval(net, hiscore, dst, i); 1689 miniscore = ipv6_get_saddr_eval(net, score, dst, i); 1690 1691 if (minihiscore > miniscore) { 1692 if (i == IPV6_SADDR_RULE_SCOPE && 1693 score->scopedist > 0) { 1694 /* 1695 * special case: 1696 * each remaining entry 1697 * has too small (not enough) 1698 * scope, because ifa entries 1699 * are sorted by their scope 1700 * values. 1701 */ 1702 goto out; 1703 } 1704 break; 1705 } else if (minihiscore < miniscore) { 1706 swap(hiscore, score); 1707 hiscore_idx = 1 - hiscore_idx; 1708 1709 /* restore our iterator */ 1710 score->ifa = hiscore->ifa; 1711 1712 break; 1713 } 1714 } 1715 } 1716 out: 1717 return hiscore_idx; 1718 } 1719 1720 static int ipv6_get_saddr_master(struct net *net, 1721 const struct net_device *dst_dev, 1722 const struct net_device *master, 1723 struct ipv6_saddr_dst *dst, 1724 struct ipv6_saddr_score *scores, 1725 int hiscore_idx) 1726 { 1727 struct inet6_dev *idev; 1728 1729 idev = __in6_dev_get(dst_dev); 1730 if (idev) 1731 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev, 1732 scores, hiscore_idx); 1733 1734 idev = __in6_dev_get(master); 1735 if (idev) 1736 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev, 1737 scores, hiscore_idx); 1738 1739 return hiscore_idx; 1740 } 1741 1742 int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev, 1743 const struct in6_addr *daddr, unsigned int prefs, 1744 struct in6_addr *saddr) 1745 { 1746 struct ipv6_saddr_score scores[2], *hiscore; 1747 struct ipv6_saddr_dst dst; 1748 struct inet6_dev *idev; 1749 struct net_device *dev; 1750 int dst_type; 1751 bool use_oif_addr = false; 1752 int hiscore_idx = 0; 1753 int ret = 0; 1754 1755 dst_type = __ipv6_addr_type(daddr); 1756 dst.addr = daddr; 1757 dst.ifindex = dst_dev ? dst_dev->ifindex : 0; 1758 dst.scope = __ipv6_addr_src_scope(dst_type); 1759 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex); 1760 dst.prefs = prefs; 1761 1762 scores[hiscore_idx].rule = -1; 1763 scores[hiscore_idx].ifa = NULL; 1764 1765 rcu_read_lock(); 1766 1767 /* Candidate Source Address (section 4) 1768 * - multicast and link-local destination address, 1769 * the set of candidate source address MUST only 1770 * include addresses assigned to interfaces 1771 * belonging to the same link as the outgoing 1772 * interface. 1773 * (- For site-local destination addresses, the 1774 * set of candidate source addresses MUST only 1775 * include addresses assigned to interfaces 1776 * belonging to the same site as the outgoing 1777 * interface.) 1778 * - "It is RECOMMENDED that the candidate source addresses 1779 * be the set of unicast addresses assigned to the 1780 * interface that will be used to send to the destination 1781 * (the 'outgoing' interface)." (RFC 6724) 1782 */ 1783 if (dst_dev) { 1784 idev = __in6_dev_get(dst_dev); 1785 if ((dst_type & IPV6_ADDR_MULTICAST) || 1786 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL || 1787 (idev && idev->cnf.use_oif_addrs_only)) { 1788 use_oif_addr = true; 1789 } 1790 } 1791 1792 if (use_oif_addr) { 1793 if (idev) 1794 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx); 1795 } else { 1796 const struct net_device *master; 1797 int master_idx = 0; 1798 1799 /* if dst_dev exists and is enslaved to an L3 device, then 1800 * prefer addresses from dst_dev and then the master over 1801 * any other enslaved devices in the L3 domain. 1802 */ 1803 master = l3mdev_master_dev_rcu(dst_dev); 1804 if (master) { 1805 master_idx = master->ifindex; 1806 1807 hiscore_idx = ipv6_get_saddr_master(net, dst_dev, 1808 master, &dst, 1809 scores, hiscore_idx); 1810 1811 if (scores[hiscore_idx].ifa) 1812 goto out; 1813 } 1814 1815 for_each_netdev_rcu(net, dev) { 1816 /* only consider addresses on devices in the 1817 * same L3 domain 1818 */ 1819 if (l3mdev_master_ifindex_rcu(dev) != master_idx) 1820 continue; 1821 idev = __in6_dev_get(dev); 1822 if (!idev) 1823 continue; 1824 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx); 1825 } 1826 } 1827 1828 out: 1829 hiscore = &scores[hiscore_idx]; 1830 if (!hiscore->ifa) 1831 ret = -EADDRNOTAVAIL; 1832 else 1833 *saddr = hiscore->ifa->addr; 1834 1835 rcu_read_unlock(); 1836 return ret; 1837 } 1838 EXPORT_SYMBOL(ipv6_dev_get_saddr); 1839 1840 int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr, 1841 u32 banned_flags) 1842 { 1843 struct inet6_ifaddr *ifp; 1844 int err = -EADDRNOTAVAIL; 1845 1846 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) { 1847 if (ifp->scope > IFA_LINK) 1848 break; 1849 if (ifp->scope == IFA_LINK && 1850 !(ifp->flags & banned_flags)) { 1851 *addr = ifp->addr; 1852 err = 0; 1853 break; 1854 } 1855 } 1856 return err; 1857 } 1858 1859 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr, 1860 u32 banned_flags) 1861 { 1862 struct inet6_dev *idev; 1863 int err = -EADDRNOTAVAIL; 1864 1865 rcu_read_lock(); 1866 idev = __in6_dev_get(dev); 1867 if (idev) { 1868 read_lock_bh(&idev->lock); 1869 err = __ipv6_get_lladdr(idev, addr, banned_flags); 1870 read_unlock_bh(&idev->lock); 1871 } 1872 rcu_read_unlock(); 1873 return err; 1874 } 1875 1876 static int ipv6_count_addresses(const struct inet6_dev *idev) 1877 { 1878 const struct inet6_ifaddr *ifp; 1879 int cnt = 0; 1880 1881 rcu_read_lock(); 1882 list_for_each_entry_rcu(ifp, &idev->addr_list, if_list) 1883 cnt++; 1884 rcu_read_unlock(); 1885 return cnt; 1886 } 1887 1888 int ipv6_chk_addr(struct net *net, const struct in6_addr *addr, 1889 const struct net_device *dev, int strict) 1890 { 1891 return ipv6_chk_addr_and_flags(net, addr, dev, !dev, 1892 strict, IFA_F_TENTATIVE); 1893 } 1894 EXPORT_SYMBOL(ipv6_chk_addr); 1895 1896 /* device argument is used to find the L3 domain of interest. If 1897 * skip_dev_check is set, then the ifp device is not checked against 1898 * the passed in dev argument. So the 2 cases for addresses checks are: 1899 * 1. does the address exist in the L3 domain that dev is part of 1900 * (skip_dev_check = true), or 1901 * 1902 * 2. does the address exist on the specific device 1903 * (skip_dev_check = false) 1904 */ 1905 int ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr, 1906 const struct net_device *dev, bool skip_dev_check, 1907 int strict, u32 banned_flags) 1908 { 1909 unsigned int hash = inet6_addr_hash(net, addr); 1910 const struct net_device *l3mdev; 1911 struct inet6_ifaddr *ifp; 1912 u32 ifp_flags; 1913 1914 rcu_read_lock(); 1915 1916 l3mdev = l3mdev_master_dev_rcu(dev); 1917 if (skip_dev_check) 1918 dev = NULL; 1919 1920 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) { 1921 if (!net_eq(dev_net(ifp->idev->dev), net)) 1922 continue; 1923 1924 if (l3mdev_master_dev_rcu(ifp->idev->dev) != l3mdev) 1925 continue; 1926 1927 /* Decouple optimistic from tentative for evaluation here. 1928 * Ban optimistic addresses explicitly, when required. 1929 */ 1930 ifp_flags = (ifp->flags&IFA_F_OPTIMISTIC) 1931 ? (ifp->flags&~IFA_F_TENTATIVE) 1932 : ifp->flags; 1933 if (ipv6_addr_equal(&ifp->addr, addr) && 1934 !(ifp_flags&banned_flags) && 1935 (!dev || ifp->idev->dev == dev || 1936 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) { 1937 rcu_read_unlock(); 1938 return 1; 1939 } 1940 } 1941 1942 rcu_read_unlock(); 1943 return 0; 1944 } 1945 EXPORT_SYMBOL(ipv6_chk_addr_and_flags); 1946 1947 1948 /* Compares an address/prefix_len with addresses on device @dev. 1949 * If one is found it returns true. 1950 */ 1951 bool ipv6_chk_custom_prefix(const struct in6_addr *addr, 1952 const unsigned int prefix_len, struct net_device *dev) 1953 { 1954 const struct inet6_ifaddr *ifa; 1955 const struct inet6_dev *idev; 1956 bool ret = false; 1957 1958 rcu_read_lock(); 1959 idev = __in6_dev_get(dev); 1960 if (idev) { 1961 list_for_each_entry_rcu(ifa, &idev->addr_list, if_list) { 1962 ret = ipv6_prefix_equal(addr, &ifa->addr, prefix_len); 1963 if (ret) 1964 break; 1965 } 1966 } 1967 rcu_read_unlock(); 1968 1969 return ret; 1970 } 1971 EXPORT_SYMBOL(ipv6_chk_custom_prefix); 1972 1973 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev) 1974 { 1975 const struct inet6_ifaddr *ifa; 1976 const struct inet6_dev *idev; 1977 int onlink; 1978 1979 onlink = 0; 1980 rcu_read_lock(); 1981 idev = __in6_dev_get(dev); 1982 if (idev) { 1983 list_for_each_entry_rcu(ifa, &idev->addr_list, if_list) { 1984 onlink = ipv6_prefix_equal(addr, &ifa->addr, 1985 ifa->prefix_len); 1986 if (onlink) 1987 break; 1988 } 1989 } 1990 rcu_read_unlock(); 1991 return onlink; 1992 } 1993 EXPORT_SYMBOL(ipv6_chk_prefix); 1994 1995 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr, 1996 struct net_device *dev, int strict) 1997 { 1998 unsigned int hash = inet6_addr_hash(net, addr); 1999 struct inet6_ifaddr *ifp, *result = NULL; 2000 2001 rcu_read_lock(); 2002 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) { 2003 if (!net_eq(dev_net(ifp->idev->dev), net)) 2004 continue; 2005 if (ipv6_addr_equal(&ifp->addr, addr)) { 2006 if (!dev || ifp->idev->dev == dev || 2007 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) { 2008 result = ifp; 2009 in6_ifa_hold(ifp); 2010 break; 2011 } 2012 } 2013 } 2014 rcu_read_unlock(); 2015 2016 return result; 2017 } 2018 2019 /* Gets referenced address, destroys ifaddr */ 2020 2021 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed) 2022 { 2023 if (dad_failed) 2024 ifp->flags |= IFA_F_DADFAILED; 2025 2026 if (ifp->flags&IFA_F_TEMPORARY) { 2027 struct inet6_ifaddr *ifpub; 2028 spin_lock_bh(&ifp->lock); 2029 ifpub = ifp->ifpub; 2030 if (ifpub) { 2031 in6_ifa_hold(ifpub); 2032 spin_unlock_bh(&ifp->lock); 2033 ipv6_create_tempaddr(ifpub, ifp, true); 2034 in6_ifa_put(ifpub); 2035 } else { 2036 spin_unlock_bh(&ifp->lock); 2037 } 2038 ipv6_del_addr(ifp); 2039 } else if (ifp->flags&IFA_F_PERMANENT || !dad_failed) { 2040 spin_lock_bh(&ifp->lock); 2041 addrconf_del_dad_work(ifp); 2042 ifp->flags |= IFA_F_TENTATIVE; 2043 if (dad_failed) 2044 ifp->flags &= ~IFA_F_OPTIMISTIC; 2045 spin_unlock_bh(&ifp->lock); 2046 if (dad_failed) 2047 ipv6_ifa_notify(0, ifp); 2048 in6_ifa_put(ifp); 2049 } else { 2050 ipv6_del_addr(ifp); 2051 } 2052 } 2053 2054 static int addrconf_dad_end(struct inet6_ifaddr *ifp) 2055 { 2056 int err = -ENOENT; 2057 2058 spin_lock_bh(&ifp->lock); 2059 if (ifp->state == INET6_IFADDR_STATE_DAD) { 2060 ifp->state = INET6_IFADDR_STATE_POSTDAD; 2061 err = 0; 2062 } 2063 spin_unlock_bh(&ifp->lock); 2064 2065 return err; 2066 } 2067 2068 void addrconf_dad_failure(struct sk_buff *skb, struct inet6_ifaddr *ifp) 2069 { 2070 struct inet6_dev *idev = ifp->idev; 2071 struct net *net = dev_net(ifp->idev->dev); 2072 2073 if (addrconf_dad_end(ifp)) { 2074 in6_ifa_put(ifp); 2075 return; 2076 } 2077 2078 net_info_ratelimited("%s: IPv6 duplicate address %pI6c used by %pM detected!\n", 2079 ifp->idev->dev->name, &ifp->addr, eth_hdr(skb)->h_source); 2080 2081 spin_lock_bh(&ifp->lock); 2082 2083 if (ifp->flags & IFA_F_STABLE_PRIVACY) { 2084 struct in6_addr new_addr; 2085 struct inet6_ifaddr *ifp2; 2086 int retries = ifp->stable_privacy_retry + 1; 2087 struct ifa6_config cfg = { 2088 .pfx = &new_addr, 2089 .plen = ifp->prefix_len, 2090 .ifa_flags = ifp->flags, 2091 .valid_lft = ifp->valid_lft, 2092 .preferred_lft = ifp->prefered_lft, 2093 .scope = ifp->scope, 2094 }; 2095 2096 if (retries > net->ipv6.sysctl.idgen_retries) { 2097 net_info_ratelimited("%s: privacy stable address generation failed because of DAD conflicts!\n", 2098 ifp->idev->dev->name); 2099 goto errdad; 2100 } 2101 2102 new_addr = ifp->addr; 2103 if (ipv6_generate_stable_address(&new_addr, retries, 2104 idev)) 2105 goto errdad; 2106 2107 spin_unlock_bh(&ifp->lock); 2108 2109 if (idev->cnf.max_addresses && 2110 ipv6_count_addresses(idev) >= 2111 idev->cnf.max_addresses) 2112 goto lock_errdad; 2113 2114 net_info_ratelimited("%s: generating new stable privacy address because of DAD conflict\n", 2115 ifp->idev->dev->name); 2116 2117 ifp2 = ipv6_add_addr(idev, &cfg, false, NULL); 2118 if (IS_ERR(ifp2)) 2119 goto lock_errdad; 2120 2121 spin_lock_bh(&ifp2->lock); 2122 ifp2->stable_privacy_retry = retries; 2123 ifp2->state = INET6_IFADDR_STATE_PREDAD; 2124 spin_unlock_bh(&ifp2->lock); 2125 2126 addrconf_mod_dad_work(ifp2, net->ipv6.sysctl.idgen_delay); 2127 in6_ifa_put(ifp2); 2128 lock_errdad: 2129 spin_lock_bh(&ifp->lock); 2130 } 2131 2132 errdad: 2133 /* transition from _POSTDAD to _ERRDAD */ 2134 ifp->state = INET6_IFADDR_STATE_ERRDAD; 2135 spin_unlock_bh(&ifp->lock); 2136 2137 addrconf_mod_dad_work(ifp, 0); 2138 in6_ifa_put(ifp); 2139 } 2140 2141 /* Join to solicited addr multicast group. 2142 * caller must hold RTNL */ 2143 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr) 2144 { 2145 struct in6_addr maddr; 2146 2147 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP)) 2148 return; 2149 2150 addrconf_addr_solict_mult(addr, &maddr); 2151 ipv6_dev_mc_inc(dev, &maddr); 2152 } 2153 2154 /* caller must hold RTNL */ 2155 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr) 2156 { 2157 struct in6_addr maddr; 2158 2159 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP)) 2160 return; 2161 2162 addrconf_addr_solict_mult(addr, &maddr); 2163 __ipv6_dev_mc_dec(idev, &maddr); 2164 } 2165 2166 /* caller must hold RTNL */ 2167 static void addrconf_join_anycast(struct inet6_ifaddr *ifp) 2168 { 2169 struct in6_addr addr; 2170 2171 if (ifp->prefix_len >= 127) /* RFC 6164 */ 2172 return; 2173 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len); 2174 if (ipv6_addr_any(&addr)) 2175 return; 2176 __ipv6_dev_ac_inc(ifp->idev, &addr); 2177 } 2178 2179 /* caller must hold RTNL */ 2180 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp) 2181 { 2182 struct in6_addr addr; 2183 2184 if (ifp->prefix_len >= 127) /* RFC 6164 */ 2185 return; 2186 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len); 2187 if (ipv6_addr_any(&addr)) 2188 return; 2189 __ipv6_dev_ac_dec(ifp->idev, &addr); 2190 } 2191 2192 static int addrconf_ifid_6lowpan(u8 *eui, struct net_device *dev) 2193 { 2194 switch (dev->addr_len) { 2195 case ETH_ALEN: 2196 memcpy(eui, dev->dev_addr, 3); 2197 eui[3] = 0xFF; 2198 eui[4] = 0xFE; 2199 memcpy(eui + 5, dev->dev_addr + 3, 3); 2200 break; 2201 case EUI64_ADDR_LEN: 2202 memcpy(eui, dev->dev_addr, EUI64_ADDR_LEN); 2203 eui[0] ^= 2; 2204 break; 2205 default: 2206 return -1; 2207 } 2208 2209 return 0; 2210 } 2211 2212 static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev) 2213 { 2214 union fwnet_hwaddr *ha; 2215 2216 if (dev->addr_len != FWNET_ALEN) 2217 return -1; 2218 2219 ha = (union fwnet_hwaddr *)dev->dev_addr; 2220 2221 memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id)); 2222 eui[0] ^= 2; 2223 return 0; 2224 } 2225 2226 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev) 2227 { 2228 /* XXX: inherit EUI-64 from other interface -- yoshfuji */ 2229 if (dev->addr_len != ARCNET_ALEN) 2230 return -1; 2231 memset(eui, 0, 7); 2232 eui[7] = *(u8 *)dev->dev_addr; 2233 return 0; 2234 } 2235 2236 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev) 2237 { 2238 if (dev->addr_len != INFINIBAND_ALEN) 2239 return -1; 2240 memcpy(eui, dev->dev_addr + 12, 8); 2241 eui[0] |= 2; 2242 return 0; 2243 } 2244 2245 static int __ipv6_isatap_ifid(u8 *eui, __be32 addr) 2246 { 2247 if (addr == 0) 2248 return -1; 2249 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) || 2250 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) || 2251 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) || 2252 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) || 2253 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) || 2254 ipv4_is_lbcast(addr)) ? 0x00 : 0x02; 2255 eui[1] = 0; 2256 eui[2] = 0x5E; 2257 eui[3] = 0xFE; 2258 memcpy(eui + 4, &addr, 4); 2259 return 0; 2260 } 2261 2262 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev) 2263 { 2264 if (dev->priv_flags & IFF_ISATAP) 2265 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr); 2266 return -1; 2267 } 2268 2269 static int addrconf_ifid_gre(u8 *eui, struct net_device *dev) 2270 { 2271 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr); 2272 } 2273 2274 static int addrconf_ifid_ip6tnl(u8 *eui, struct net_device *dev) 2275 { 2276 memcpy(eui, dev->perm_addr, 3); 2277 memcpy(eui + 5, dev->perm_addr + 3, 3); 2278 eui[3] = 0xFF; 2279 eui[4] = 0xFE; 2280 eui[0] ^= 2; 2281 return 0; 2282 } 2283 2284 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev) 2285 { 2286 switch (dev->type) { 2287 case ARPHRD_ETHER: 2288 case ARPHRD_FDDI: 2289 return addrconf_ifid_eui48(eui, dev); 2290 case ARPHRD_ARCNET: 2291 return addrconf_ifid_arcnet(eui, dev); 2292 case ARPHRD_INFINIBAND: 2293 return addrconf_ifid_infiniband(eui, dev); 2294 case ARPHRD_SIT: 2295 return addrconf_ifid_sit(eui, dev); 2296 case ARPHRD_IPGRE: 2297 case ARPHRD_TUNNEL: 2298 return addrconf_ifid_gre(eui, dev); 2299 case ARPHRD_6LOWPAN: 2300 return addrconf_ifid_6lowpan(eui, dev); 2301 case ARPHRD_IEEE1394: 2302 return addrconf_ifid_ieee1394(eui, dev); 2303 case ARPHRD_TUNNEL6: 2304 case ARPHRD_IP6GRE: 2305 case ARPHRD_RAWIP: 2306 return addrconf_ifid_ip6tnl(eui, dev); 2307 } 2308 return -1; 2309 } 2310 2311 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev) 2312 { 2313 int err = -1; 2314 struct inet6_ifaddr *ifp; 2315 2316 read_lock_bh(&idev->lock); 2317 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) { 2318 if (ifp->scope > IFA_LINK) 2319 break; 2320 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) { 2321 memcpy(eui, ifp->addr.s6_addr+8, 8); 2322 err = 0; 2323 break; 2324 } 2325 } 2326 read_unlock_bh(&idev->lock); 2327 return err; 2328 } 2329 2330 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */ 2331 static void ipv6_regen_rndid(struct inet6_dev *idev) 2332 { 2333 regen: 2334 get_random_bytes(idev->rndid, sizeof(idev->rndid)); 2335 idev->rndid[0] &= ~0x02; 2336 2337 /* 2338 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>: 2339 * check if generated address is not inappropriate 2340 * 2341 * - Reserved subnet anycast (RFC 2526) 2342 * 11111101 11....11 1xxxxxxx 2343 * - ISATAP (RFC4214) 6.1 2344 * 00-00-5E-FE-xx-xx-xx-xx 2345 * - value 0 2346 * - XXX: already assigned to an address on the device 2347 */ 2348 if (idev->rndid[0] == 0xfd && 2349 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff && 2350 (idev->rndid[7]&0x80)) 2351 goto regen; 2352 if ((idev->rndid[0]|idev->rndid[1]) == 0) { 2353 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe) 2354 goto regen; 2355 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00) 2356 goto regen; 2357 } 2358 } 2359 2360 static void ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) 2361 { 2362 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0) 2363 ipv6_regen_rndid(idev); 2364 } 2365 2366 /* 2367 * Add prefix route. 2368 */ 2369 2370 static void 2371 addrconf_prefix_route(struct in6_addr *pfx, int plen, u32 metric, 2372 struct net_device *dev, unsigned long expires, 2373 u32 flags, gfp_t gfp_flags) 2374 { 2375 struct fib6_config cfg = { 2376 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX, 2377 .fc_metric = metric ? : IP6_RT_PRIO_ADDRCONF, 2378 .fc_ifindex = dev->ifindex, 2379 .fc_expires = expires, 2380 .fc_dst_len = plen, 2381 .fc_flags = RTF_UP | flags, 2382 .fc_nlinfo.nl_net = dev_net(dev), 2383 .fc_protocol = RTPROT_KERNEL, 2384 .fc_type = RTN_UNICAST, 2385 }; 2386 2387 cfg.fc_dst = *pfx; 2388 2389 /* Prevent useless cloning on PtP SIT. 2390 This thing is done here expecting that the whole 2391 class of non-broadcast devices need not cloning. 2392 */ 2393 #if IS_ENABLED(CONFIG_IPV6_SIT) 2394 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT)) 2395 cfg.fc_flags |= RTF_NONEXTHOP; 2396 #endif 2397 2398 ip6_route_add(&cfg, gfp_flags, NULL); 2399 } 2400 2401 2402 static struct fib6_info *addrconf_get_prefix_route(const struct in6_addr *pfx, 2403 int plen, 2404 const struct net_device *dev, 2405 u32 flags, u32 noflags) 2406 { 2407 struct fib6_node *fn; 2408 struct fib6_info *rt = NULL; 2409 struct fib6_table *table; 2410 u32 tb_id = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX; 2411 2412 table = fib6_get_table(dev_net(dev), tb_id); 2413 if (!table) 2414 return NULL; 2415 2416 rcu_read_lock(); 2417 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0, true); 2418 if (!fn) 2419 goto out; 2420 2421 for_each_fib6_node_rt_rcu(fn) { 2422 if (rt->fib6_nh.nh_dev->ifindex != dev->ifindex) 2423 continue; 2424 if ((rt->fib6_flags & flags) != flags) 2425 continue; 2426 if ((rt->fib6_flags & noflags) != 0) 2427 continue; 2428 if (!fib6_info_hold_safe(rt)) 2429 continue; 2430 break; 2431 } 2432 out: 2433 rcu_read_unlock(); 2434 return rt; 2435 } 2436 2437 2438 /* Create "default" multicast route to the interface */ 2439 2440 static void addrconf_add_mroute(struct net_device *dev) 2441 { 2442 struct fib6_config cfg = { 2443 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_LOCAL, 2444 .fc_metric = IP6_RT_PRIO_ADDRCONF, 2445 .fc_ifindex = dev->ifindex, 2446 .fc_dst_len = 8, 2447 .fc_flags = RTF_UP, 2448 .fc_type = RTN_UNICAST, 2449 .fc_nlinfo.nl_net = dev_net(dev), 2450 }; 2451 2452 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0); 2453 2454 ip6_route_add(&cfg, GFP_KERNEL, NULL); 2455 } 2456 2457 static struct inet6_dev *addrconf_add_dev(struct net_device *dev) 2458 { 2459 struct inet6_dev *idev; 2460 2461 ASSERT_RTNL(); 2462 2463 idev = ipv6_find_idev(dev); 2464 if (!idev) 2465 return ERR_PTR(-ENOBUFS); 2466 2467 if (idev->cnf.disable_ipv6) 2468 return ERR_PTR(-EACCES); 2469 2470 /* Add default multicast route */ 2471 if (!(dev->flags & IFF_LOOPBACK) && !netif_is_l3_master(dev)) 2472 addrconf_add_mroute(dev); 2473 2474 return idev; 2475 } 2476 2477 static void manage_tempaddrs(struct inet6_dev *idev, 2478 struct inet6_ifaddr *ifp, 2479 __u32 valid_lft, __u32 prefered_lft, 2480 bool create, unsigned long now) 2481 { 2482 u32 flags; 2483 struct inet6_ifaddr *ift; 2484 2485 read_lock_bh(&idev->lock); 2486 /* update all temporary addresses in the list */ 2487 list_for_each_entry(ift, &idev->tempaddr_list, tmp_list) { 2488 int age, max_valid, max_prefered; 2489 2490 if (ifp != ift->ifpub) 2491 continue; 2492 2493 /* RFC 4941 section 3.3: 2494 * If a received option will extend the lifetime of a public 2495 * address, the lifetimes of temporary addresses should 2496 * be extended, subject to the overall constraint that no 2497 * temporary addresses should ever remain "valid" or "preferred" 2498 * for a time longer than (TEMP_VALID_LIFETIME) or 2499 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), respectively. 2500 */ 2501 age = (now - ift->cstamp) / HZ; 2502 max_valid = idev->cnf.temp_valid_lft - age; 2503 if (max_valid < 0) 2504 max_valid = 0; 2505 2506 max_prefered = idev->cnf.temp_prefered_lft - 2507 idev->desync_factor - age; 2508 if (max_prefered < 0) 2509 max_prefered = 0; 2510 2511 if (valid_lft > max_valid) 2512 valid_lft = max_valid; 2513 2514 if (prefered_lft > max_prefered) 2515 prefered_lft = max_prefered; 2516 2517 spin_lock(&ift->lock); 2518 flags = ift->flags; 2519 ift->valid_lft = valid_lft; 2520 ift->prefered_lft = prefered_lft; 2521 ift->tstamp = now; 2522 if (prefered_lft > 0) 2523 ift->flags &= ~IFA_F_DEPRECATED; 2524 2525 spin_unlock(&ift->lock); 2526 if (!(flags&IFA_F_TENTATIVE)) 2527 ipv6_ifa_notify(0, ift); 2528 } 2529 2530 if ((create || list_empty(&idev->tempaddr_list)) && 2531 idev->cnf.use_tempaddr > 0) { 2532 /* When a new public address is created as described 2533 * in [ADDRCONF], also create a new temporary address. 2534 * Also create a temporary address if it's enabled but 2535 * no temporary address currently exists. 2536 */ 2537 read_unlock_bh(&idev->lock); 2538 ipv6_create_tempaddr(ifp, NULL, false); 2539 } else { 2540 read_unlock_bh(&idev->lock); 2541 } 2542 } 2543 2544 static bool is_addr_mode_generate_stable(struct inet6_dev *idev) 2545 { 2546 return idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY || 2547 idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_RANDOM; 2548 } 2549 2550 int addrconf_prefix_rcv_add_addr(struct net *net, struct net_device *dev, 2551 const struct prefix_info *pinfo, 2552 struct inet6_dev *in6_dev, 2553 const struct in6_addr *addr, int addr_type, 2554 u32 addr_flags, bool sllao, bool tokenized, 2555 __u32 valid_lft, u32 prefered_lft) 2556 { 2557 struct inet6_ifaddr *ifp = ipv6_get_ifaddr(net, addr, dev, 1); 2558 int create = 0, update_lft = 0; 2559 2560 if (!ifp && valid_lft) { 2561 int max_addresses = in6_dev->cnf.max_addresses; 2562 struct ifa6_config cfg = { 2563 .pfx = addr, 2564 .plen = pinfo->prefix_len, 2565 .ifa_flags = addr_flags, 2566 .valid_lft = valid_lft, 2567 .preferred_lft = prefered_lft, 2568 .scope = addr_type & IPV6_ADDR_SCOPE_MASK, 2569 }; 2570 2571 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 2572 if ((net->ipv6.devconf_all->optimistic_dad || 2573 in6_dev->cnf.optimistic_dad) && 2574 !net->ipv6.devconf_all->forwarding && sllao) 2575 cfg.ifa_flags |= IFA_F_OPTIMISTIC; 2576 #endif 2577 2578 /* Do not allow to create too much of autoconfigured 2579 * addresses; this would be too easy way to crash kernel. 2580 */ 2581 if (!max_addresses || 2582 ipv6_count_addresses(in6_dev) < max_addresses) 2583 ifp = ipv6_add_addr(in6_dev, &cfg, false, NULL); 2584 2585 if (IS_ERR_OR_NULL(ifp)) 2586 return -1; 2587 2588 create = 1; 2589 spin_lock_bh(&ifp->lock); 2590 ifp->flags |= IFA_F_MANAGETEMPADDR; 2591 ifp->cstamp = jiffies; 2592 ifp->tokenized = tokenized; 2593 spin_unlock_bh(&ifp->lock); 2594 addrconf_dad_start(ifp); 2595 } 2596 2597 if (ifp) { 2598 u32 flags; 2599 unsigned long now; 2600 u32 stored_lft; 2601 2602 /* update lifetime (RFC2462 5.5.3 e) */ 2603 spin_lock_bh(&ifp->lock); 2604 now = jiffies; 2605 if (ifp->valid_lft > (now - ifp->tstamp) / HZ) 2606 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ; 2607 else 2608 stored_lft = 0; 2609 if (!create && stored_lft) { 2610 const u32 minimum_lft = min_t(u32, 2611 stored_lft, MIN_VALID_LIFETIME); 2612 valid_lft = max(valid_lft, minimum_lft); 2613 2614 /* RFC4862 Section 5.5.3e: 2615 * "Note that the preferred lifetime of the 2616 * corresponding address is always reset to 2617 * the Preferred Lifetime in the received 2618 * Prefix Information option, regardless of 2619 * whether the valid lifetime is also reset or 2620 * ignored." 2621 * 2622 * So we should always update prefered_lft here. 2623 */ 2624 update_lft = 1; 2625 } 2626 2627 if (update_lft) { 2628 ifp->valid_lft = valid_lft; 2629 ifp->prefered_lft = prefered_lft; 2630 ifp->tstamp = now; 2631 flags = ifp->flags; 2632 ifp->flags &= ~IFA_F_DEPRECATED; 2633 spin_unlock_bh(&ifp->lock); 2634 2635 if (!(flags&IFA_F_TENTATIVE)) 2636 ipv6_ifa_notify(0, ifp); 2637 } else 2638 spin_unlock_bh(&ifp->lock); 2639 2640 manage_tempaddrs(in6_dev, ifp, valid_lft, prefered_lft, 2641 create, now); 2642 2643 in6_ifa_put(ifp); 2644 addrconf_verify(); 2645 } 2646 2647 return 0; 2648 } 2649 EXPORT_SYMBOL_GPL(addrconf_prefix_rcv_add_addr); 2650 2651 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao) 2652 { 2653 struct prefix_info *pinfo; 2654 __u32 valid_lft; 2655 __u32 prefered_lft; 2656 int addr_type, err; 2657 u32 addr_flags = 0; 2658 struct inet6_dev *in6_dev; 2659 struct net *net = dev_net(dev); 2660 2661 pinfo = (struct prefix_info *) opt; 2662 2663 if (len < sizeof(struct prefix_info)) { 2664 netdev_dbg(dev, "addrconf: prefix option too short\n"); 2665 return; 2666 } 2667 2668 /* 2669 * Validation checks ([ADDRCONF], page 19) 2670 */ 2671 2672 addr_type = ipv6_addr_type(&pinfo->prefix); 2673 2674 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL)) 2675 return; 2676 2677 valid_lft = ntohl(pinfo->valid); 2678 prefered_lft = ntohl(pinfo->prefered); 2679 2680 if (prefered_lft > valid_lft) { 2681 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n"); 2682 return; 2683 } 2684 2685 in6_dev = in6_dev_get(dev); 2686 2687 if (!in6_dev) { 2688 net_dbg_ratelimited("addrconf: device %s not configured\n", 2689 dev->name); 2690 return; 2691 } 2692 2693 /* 2694 * Two things going on here: 2695 * 1) Add routes for on-link prefixes 2696 * 2) Configure prefixes with the auto flag set 2697 */ 2698 2699 if (pinfo->onlink) { 2700 struct fib6_info *rt; 2701 unsigned long rt_expires; 2702 2703 /* Avoid arithmetic overflow. Really, we could 2704 * save rt_expires in seconds, likely valid_lft, 2705 * but it would require division in fib gc, that it 2706 * not good. 2707 */ 2708 if (HZ > USER_HZ) 2709 rt_expires = addrconf_timeout_fixup(valid_lft, HZ); 2710 else 2711 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ); 2712 2713 if (addrconf_finite_timeout(rt_expires)) 2714 rt_expires *= HZ; 2715 2716 rt = addrconf_get_prefix_route(&pinfo->prefix, 2717 pinfo->prefix_len, 2718 dev, 2719 RTF_ADDRCONF | RTF_PREFIX_RT, 2720 RTF_GATEWAY | RTF_DEFAULT); 2721 2722 if (rt) { 2723 /* Autoconf prefix route */ 2724 if (valid_lft == 0) { 2725 ip6_del_rt(net, rt); 2726 rt = NULL; 2727 } else if (addrconf_finite_timeout(rt_expires)) { 2728 /* not infinity */ 2729 fib6_set_expires(rt, jiffies + rt_expires); 2730 } else { 2731 fib6_clean_expires(rt); 2732 } 2733 } else if (valid_lft) { 2734 clock_t expires = 0; 2735 int flags = RTF_ADDRCONF | RTF_PREFIX_RT; 2736 if (addrconf_finite_timeout(rt_expires)) { 2737 /* not infinity */ 2738 flags |= RTF_EXPIRES; 2739 expires = jiffies_to_clock_t(rt_expires); 2740 } 2741 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len, 2742 0, dev, expires, flags, 2743 GFP_ATOMIC); 2744 } 2745 fib6_info_release(rt); 2746 } 2747 2748 /* Try to figure out our local address for this prefix */ 2749 2750 if (pinfo->autoconf && in6_dev->cnf.autoconf) { 2751 struct in6_addr addr; 2752 bool tokenized = false, dev_addr_generated = false; 2753 2754 if (pinfo->prefix_len == 64) { 2755 memcpy(&addr, &pinfo->prefix, 8); 2756 2757 if (!ipv6_addr_any(&in6_dev->token)) { 2758 read_lock_bh(&in6_dev->lock); 2759 memcpy(addr.s6_addr + 8, 2760 in6_dev->token.s6_addr + 8, 8); 2761 read_unlock_bh(&in6_dev->lock); 2762 tokenized = true; 2763 } else if (is_addr_mode_generate_stable(in6_dev) && 2764 !ipv6_generate_stable_address(&addr, 0, 2765 in6_dev)) { 2766 addr_flags |= IFA_F_STABLE_PRIVACY; 2767 goto ok; 2768 } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) && 2769 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) { 2770 goto put; 2771 } else { 2772 dev_addr_generated = true; 2773 } 2774 goto ok; 2775 } 2776 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n", 2777 pinfo->prefix_len); 2778 goto put; 2779 2780 ok: 2781 err = addrconf_prefix_rcv_add_addr(net, dev, pinfo, in6_dev, 2782 &addr, addr_type, 2783 addr_flags, sllao, 2784 tokenized, valid_lft, 2785 prefered_lft); 2786 if (err) 2787 goto put; 2788 2789 /* Ignore error case here because previous prefix add addr was 2790 * successful which will be notified. 2791 */ 2792 ndisc_ops_prefix_rcv_add_addr(net, dev, pinfo, in6_dev, &addr, 2793 addr_type, addr_flags, sllao, 2794 tokenized, valid_lft, 2795 prefered_lft, 2796 dev_addr_generated); 2797 } 2798 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo); 2799 put: 2800 in6_dev_put(in6_dev); 2801 } 2802 2803 /* 2804 * Set destination address. 2805 * Special case for SIT interfaces where we create a new "virtual" 2806 * device. 2807 */ 2808 int addrconf_set_dstaddr(struct net *net, void __user *arg) 2809 { 2810 struct in6_ifreq ireq; 2811 struct net_device *dev; 2812 int err = -EINVAL; 2813 2814 rtnl_lock(); 2815 2816 err = -EFAULT; 2817 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2818 goto err_exit; 2819 2820 dev = __dev_get_by_index(net, ireq.ifr6_ifindex); 2821 2822 err = -ENODEV; 2823 if (!dev) 2824 goto err_exit; 2825 2826 #if IS_ENABLED(CONFIG_IPV6_SIT) 2827 if (dev->type == ARPHRD_SIT) { 2828 const struct net_device_ops *ops = dev->netdev_ops; 2829 struct ifreq ifr; 2830 struct ip_tunnel_parm p; 2831 2832 err = -EADDRNOTAVAIL; 2833 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4)) 2834 goto err_exit; 2835 2836 memset(&p, 0, sizeof(p)); 2837 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3]; 2838 p.iph.saddr = 0; 2839 p.iph.version = 4; 2840 p.iph.ihl = 5; 2841 p.iph.protocol = IPPROTO_IPV6; 2842 p.iph.ttl = 64; 2843 ifr.ifr_ifru.ifru_data = (__force void __user *)&p; 2844 2845 if (ops->ndo_do_ioctl) { 2846 mm_segment_t oldfs = get_fs(); 2847 2848 set_fs(KERNEL_DS); 2849 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL); 2850 set_fs(oldfs); 2851 } else 2852 err = -EOPNOTSUPP; 2853 2854 if (err == 0) { 2855 err = -ENOBUFS; 2856 dev = __dev_get_by_name(net, p.name); 2857 if (!dev) 2858 goto err_exit; 2859 err = dev_open(dev, NULL); 2860 } 2861 } 2862 #endif 2863 2864 err_exit: 2865 rtnl_unlock(); 2866 return err; 2867 } 2868 2869 static int ipv6_mc_config(struct sock *sk, bool join, 2870 const struct in6_addr *addr, int ifindex) 2871 { 2872 int ret; 2873 2874 ASSERT_RTNL(); 2875 2876 lock_sock(sk); 2877 if (join) 2878 ret = ipv6_sock_mc_join(sk, ifindex, addr); 2879 else 2880 ret = ipv6_sock_mc_drop(sk, ifindex, addr); 2881 release_sock(sk); 2882 2883 return ret; 2884 } 2885 2886 /* 2887 * Manual configuration of address on an interface 2888 */ 2889 static int inet6_addr_add(struct net *net, int ifindex, 2890 struct ifa6_config *cfg, 2891 struct netlink_ext_ack *extack) 2892 { 2893 struct inet6_ifaddr *ifp; 2894 struct inet6_dev *idev; 2895 struct net_device *dev; 2896 unsigned long timeout; 2897 clock_t expires; 2898 u32 flags; 2899 2900 ASSERT_RTNL(); 2901 2902 if (cfg->plen > 128) 2903 return -EINVAL; 2904 2905 /* check the lifetime */ 2906 if (!cfg->valid_lft || cfg->preferred_lft > cfg->valid_lft) 2907 return -EINVAL; 2908 2909 if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR && cfg->plen != 64) 2910 return -EINVAL; 2911 2912 dev = __dev_get_by_index(net, ifindex); 2913 if (!dev) 2914 return -ENODEV; 2915 2916 idev = addrconf_add_dev(dev); 2917 if (IS_ERR(idev)) 2918 return PTR_ERR(idev); 2919 2920 if (cfg->ifa_flags & IFA_F_MCAUTOJOIN) { 2921 int ret = ipv6_mc_config(net->ipv6.mc_autojoin_sk, 2922 true, cfg->pfx, ifindex); 2923 2924 if (ret < 0) 2925 return ret; 2926 } 2927 2928 cfg->scope = ipv6_addr_scope(cfg->pfx); 2929 2930 timeout = addrconf_timeout_fixup(cfg->valid_lft, HZ); 2931 if (addrconf_finite_timeout(timeout)) { 2932 expires = jiffies_to_clock_t(timeout * HZ); 2933 cfg->valid_lft = timeout; 2934 flags = RTF_EXPIRES; 2935 } else { 2936 expires = 0; 2937 flags = 0; 2938 cfg->ifa_flags |= IFA_F_PERMANENT; 2939 } 2940 2941 timeout = addrconf_timeout_fixup(cfg->preferred_lft, HZ); 2942 if (addrconf_finite_timeout(timeout)) { 2943 if (timeout == 0) 2944 cfg->ifa_flags |= IFA_F_DEPRECATED; 2945 cfg->preferred_lft = timeout; 2946 } 2947 2948 ifp = ipv6_add_addr(idev, cfg, true, extack); 2949 if (!IS_ERR(ifp)) { 2950 if (!(cfg->ifa_flags & IFA_F_NOPREFIXROUTE)) { 2951 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, 2952 ifp->rt_priority, dev, expires, 2953 flags, GFP_KERNEL); 2954 } 2955 2956 /* Send a netlink notification if DAD is enabled and 2957 * optimistic flag is not set 2958 */ 2959 if (!(ifp->flags & (IFA_F_OPTIMISTIC | IFA_F_NODAD))) 2960 ipv6_ifa_notify(0, ifp); 2961 /* 2962 * Note that section 3.1 of RFC 4429 indicates 2963 * that the Optimistic flag should not be set for 2964 * manually configured addresses 2965 */ 2966 addrconf_dad_start(ifp); 2967 if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR) 2968 manage_tempaddrs(idev, ifp, cfg->valid_lft, 2969 cfg->preferred_lft, true, jiffies); 2970 in6_ifa_put(ifp); 2971 addrconf_verify_rtnl(); 2972 return 0; 2973 } else if (cfg->ifa_flags & IFA_F_MCAUTOJOIN) { 2974 ipv6_mc_config(net->ipv6.mc_autojoin_sk, false, 2975 cfg->pfx, ifindex); 2976 } 2977 2978 return PTR_ERR(ifp); 2979 } 2980 2981 static int inet6_addr_del(struct net *net, int ifindex, u32 ifa_flags, 2982 const struct in6_addr *pfx, unsigned int plen) 2983 { 2984 struct inet6_ifaddr *ifp; 2985 struct inet6_dev *idev; 2986 struct net_device *dev; 2987 2988 if (plen > 128) 2989 return -EINVAL; 2990 2991 dev = __dev_get_by_index(net, ifindex); 2992 if (!dev) 2993 return -ENODEV; 2994 2995 idev = __in6_dev_get(dev); 2996 if (!idev) 2997 return -ENXIO; 2998 2999 read_lock_bh(&idev->lock); 3000 list_for_each_entry(ifp, &idev->addr_list, if_list) { 3001 if (ifp->prefix_len == plen && 3002 ipv6_addr_equal(pfx, &ifp->addr)) { 3003 in6_ifa_hold(ifp); 3004 read_unlock_bh(&idev->lock); 3005 3006 if (!(ifp->flags & IFA_F_TEMPORARY) && 3007 (ifa_flags & IFA_F_MANAGETEMPADDR)) 3008 manage_tempaddrs(idev, ifp, 0, 0, false, 3009 jiffies); 3010 ipv6_del_addr(ifp); 3011 addrconf_verify_rtnl(); 3012 if (ipv6_addr_is_multicast(pfx)) { 3013 ipv6_mc_config(net->ipv6.mc_autojoin_sk, 3014 false, pfx, dev->ifindex); 3015 } 3016 return 0; 3017 } 3018 } 3019 read_unlock_bh(&idev->lock); 3020 return -EADDRNOTAVAIL; 3021 } 3022 3023 3024 int addrconf_add_ifaddr(struct net *net, void __user *arg) 3025 { 3026 struct ifa6_config cfg = { 3027 .ifa_flags = IFA_F_PERMANENT, 3028 .preferred_lft = INFINITY_LIFE_TIME, 3029 .valid_lft = INFINITY_LIFE_TIME, 3030 }; 3031 struct in6_ifreq ireq; 3032 int err; 3033 3034 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 3035 return -EPERM; 3036 3037 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 3038 return -EFAULT; 3039 3040 cfg.pfx = &ireq.ifr6_addr; 3041 cfg.plen = ireq.ifr6_prefixlen; 3042 3043 rtnl_lock(); 3044 err = inet6_addr_add(net, ireq.ifr6_ifindex, &cfg, NULL); 3045 rtnl_unlock(); 3046 return err; 3047 } 3048 3049 int addrconf_del_ifaddr(struct net *net, void __user *arg) 3050 { 3051 struct in6_ifreq ireq; 3052 int err; 3053 3054 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 3055 return -EPERM; 3056 3057 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 3058 return -EFAULT; 3059 3060 rtnl_lock(); 3061 err = inet6_addr_del(net, ireq.ifr6_ifindex, 0, &ireq.ifr6_addr, 3062 ireq.ifr6_prefixlen); 3063 rtnl_unlock(); 3064 return err; 3065 } 3066 3067 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr, 3068 int plen, int scope) 3069 { 3070 struct inet6_ifaddr *ifp; 3071 struct ifa6_config cfg = { 3072 .pfx = addr, 3073 .plen = plen, 3074 .ifa_flags = IFA_F_PERMANENT, 3075 .valid_lft = INFINITY_LIFE_TIME, 3076 .preferred_lft = INFINITY_LIFE_TIME, 3077 .scope = scope 3078 }; 3079 3080 ifp = ipv6_add_addr(idev, &cfg, true, NULL); 3081 if (!IS_ERR(ifp)) { 3082 spin_lock_bh(&ifp->lock); 3083 ifp->flags &= ~IFA_F_TENTATIVE; 3084 spin_unlock_bh(&ifp->lock); 3085 rt_genid_bump_ipv6(dev_net(idev->dev)); 3086 ipv6_ifa_notify(RTM_NEWADDR, ifp); 3087 in6_ifa_put(ifp); 3088 } 3089 } 3090 3091 #if IS_ENABLED(CONFIG_IPV6_SIT) 3092 static void sit_add_v4_addrs(struct inet6_dev *idev) 3093 { 3094 struct in6_addr addr; 3095 struct net_device *dev; 3096 struct net *net = dev_net(idev->dev); 3097 int scope, plen; 3098 u32 pflags = 0; 3099 3100 ASSERT_RTNL(); 3101 3102 memset(&addr, 0, sizeof(struct in6_addr)); 3103 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4); 3104 3105 if (idev->dev->flags&IFF_POINTOPOINT) { 3106 addr.s6_addr32[0] = htonl(0xfe800000); 3107 scope = IFA_LINK; 3108 plen = 64; 3109 } else { 3110 scope = IPV6_ADDR_COMPATv4; 3111 plen = 96; 3112 pflags |= RTF_NONEXTHOP; 3113 } 3114 3115 if (addr.s6_addr32[3]) { 3116 add_addr(idev, &addr, plen, scope); 3117 addrconf_prefix_route(&addr, plen, 0, idev->dev, 0, pflags, 3118 GFP_KERNEL); 3119 return; 3120 } 3121 3122 for_each_netdev(net, dev) { 3123 struct in_device *in_dev = __in_dev_get_rtnl(dev); 3124 if (in_dev && (dev->flags & IFF_UP)) { 3125 struct in_ifaddr *ifa; 3126 3127 int flag = scope; 3128 3129 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) { 3130 3131 addr.s6_addr32[3] = ifa->ifa_local; 3132 3133 if (ifa->ifa_scope == RT_SCOPE_LINK) 3134 continue; 3135 if (ifa->ifa_scope >= RT_SCOPE_HOST) { 3136 if (idev->dev->flags&IFF_POINTOPOINT) 3137 continue; 3138 flag |= IFA_HOST; 3139 } 3140 3141 add_addr(idev, &addr, plen, flag); 3142 addrconf_prefix_route(&addr, plen, 0, idev->dev, 3143 0, pflags, GFP_KERNEL); 3144 } 3145 } 3146 } 3147 } 3148 #endif 3149 3150 static void init_loopback(struct net_device *dev) 3151 { 3152 struct inet6_dev *idev; 3153 3154 /* ::1 */ 3155 3156 ASSERT_RTNL(); 3157 3158 idev = ipv6_find_idev(dev); 3159 if (!idev) { 3160 pr_debug("%s: add_dev failed\n", __func__); 3161 return; 3162 } 3163 3164 add_addr(idev, &in6addr_loopback, 128, IFA_HOST); 3165 } 3166 3167 void addrconf_add_linklocal(struct inet6_dev *idev, 3168 const struct in6_addr *addr, u32 flags) 3169 { 3170 struct ifa6_config cfg = { 3171 .pfx = addr, 3172 .plen = 64, 3173 .ifa_flags = flags | IFA_F_PERMANENT, 3174 .valid_lft = INFINITY_LIFE_TIME, 3175 .preferred_lft = INFINITY_LIFE_TIME, 3176 .scope = IFA_LINK 3177 }; 3178 struct inet6_ifaddr *ifp; 3179 3180 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 3181 if ((dev_net(idev->dev)->ipv6.devconf_all->optimistic_dad || 3182 idev->cnf.optimistic_dad) && 3183 !dev_net(idev->dev)->ipv6.devconf_all->forwarding) 3184 cfg.ifa_flags |= IFA_F_OPTIMISTIC; 3185 #endif 3186 3187 ifp = ipv6_add_addr(idev, &cfg, true, NULL); 3188 if (!IS_ERR(ifp)) { 3189 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, 0, idev->dev, 3190 0, 0, GFP_ATOMIC); 3191 addrconf_dad_start(ifp); 3192 in6_ifa_put(ifp); 3193 } 3194 } 3195 EXPORT_SYMBOL_GPL(addrconf_add_linklocal); 3196 3197 static bool ipv6_reserved_interfaceid(struct in6_addr address) 3198 { 3199 if ((address.s6_addr32[2] | address.s6_addr32[3]) == 0) 3200 return true; 3201 3202 if (address.s6_addr32[2] == htonl(0x02005eff) && 3203 ((address.s6_addr32[3] & htonl(0xfe000000)) == htonl(0xfe000000))) 3204 return true; 3205 3206 if (address.s6_addr32[2] == htonl(0xfdffffff) && 3207 ((address.s6_addr32[3] & htonl(0xffffff80)) == htonl(0xffffff80))) 3208 return true; 3209 3210 return false; 3211 } 3212 3213 static int ipv6_generate_stable_address(struct in6_addr *address, 3214 u8 dad_count, 3215 const struct inet6_dev *idev) 3216 { 3217 static DEFINE_SPINLOCK(lock); 3218 static __u32 digest[SHA_DIGEST_WORDS]; 3219 static __u32 workspace[SHA_WORKSPACE_WORDS]; 3220 3221 static union { 3222 char __data[SHA_MESSAGE_BYTES]; 3223 struct { 3224 struct in6_addr secret; 3225 __be32 prefix[2]; 3226 unsigned char hwaddr[MAX_ADDR_LEN]; 3227 u8 dad_count; 3228 } __packed; 3229 } data; 3230 3231 struct in6_addr secret; 3232 struct in6_addr temp; 3233 struct net *net = dev_net(idev->dev); 3234 3235 BUILD_BUG_ON(sizeof(data.__data) != sizeof(data)); 3236 3237 if (idev->cnf.stable_secret.initialized) 3238 secret = idev->cnf.stable_secret.secret; 3239 else if (net->ipv6.devconf_dflt->stable_secret.initialized) 3240 secret = net->ipv6.devconf_dflt->stable_secret.secret; 3241 else 3242 return -1; 3243 3244 retry: 3245 spin_lock_bh(&lock); 3246 3247 sha_init(digest); 3248 memset(&data, 0, sizeof(data)); 3249 memset(workspace, 0, sizeof(workspace)); 3250 memcpy(data.hwaddr, idev->dev->perm_addr, idev->dev->addr_len); 3251 data.prefix[0] = address->s6_addr32[0]; 3252 data.prefix[1] = address->s6_addr32[1]; 3253 data.secret = secret; 3254 data.dad_count = dad_count; 3255 3256 sha_transform(digest, data.__data, workspace); 3257 3258 temp = *address; 3259 temp.s6_addr32[2] = (__force __be32)digest[0]; 3260 temp.s6_addr32[3] = (__force __be32)digest[1]; 3261 3262 spin_unlock_bh(&lock); 3263 3264 if (ipv6_reserved_interfaceid(temp)) { 3265 dad_count++; 3266 if (dad_count > dev_net(idev->dev)->ipv6.sysctl.idgen_retries) 3267 return -1; 3268 goto retry; 3269 } 3270 3271 *address = temp; 3272 return 0; 3273 } 3274 3275 static void ipv6_gen_mode_random_init(struct inet6_dev *idev) 3276 { 3277 struct ipv6_stable_secret *s = &idev->cnf.stable_secret; 3278 3279 if (s->initialized) 3280 return; 3281 s = &idev->cnf.stable_secret; 3282 get_random_bytes(&s->secret, sizeof(s->secret)); 3283 s->initialized = true; 3284 } 3285 3286 static void addrconf_addr_gen(struct inet6_dev *idev, bool prefix_route) 3287 { 3288 struct in6_addr addr; 3289 3290 /* no link local addresses on L3 master devices */ 3291 if (netif_is_l3_master(idev->dev)) 3292 return; 3293 3294 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0); 3295 3296 switch (idev->cnf.addr_gen_mode) { 3297 case IN6_ADDR_GEN_MODE_RANDOM: 3298 ipv6_gen_mode_random_init(idev); 3299 /* fallthrough */ 3300 case IN6_ADDR_GEN_MODE_STABLE_PRIVACY: 3301 if (!ipv6_generate_stable_address(&addr, 0, idev)) 3302 addrconf_add_linklocal(idev, &addr, 3303 IFA_F_STABLE_PRIVACY); 3304 else if (prefix_route) 3305 addrconf_prefix_route(&addr, 64, 0, idev->dev, 3306 0, 0, GFP_KERNEL); 3307 break; 3308 case IN6_ADDR_GEN_MODE_EUI64: 3309 /* addrconf_add_linklocal also adds a prefix_route and we 3310 * only need to care about prefix routes if ipv6_generate_eui64 3311 * couldn't generate one. 3312 */ 3313 if (ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) == 0) 3314 addrconf_add_linklocal(idev, &addr, 0); 3315 else if (prefix_route) 3316 addrconf_prefix_route(&addr, 64, 0, idev->dev, 3317 0, 0, GFP_KERNEL); 3318 break; 3319 case IN6_ADDR_GEN_MODE_NONE: 3320 default: 3321 /* will not add any link local address */ 3322 break; 3323 } 3324 } 3325 3326 static void addrconf_dev_config(struct net_device *dev) 3327 { 3328 struct inet6_dev *idev; 3329 3330 ASSERT_RTNL(); 3331 3332 if ((dev->type != ARPHRD_ETHER) && 3333 (dev->type != ARPHRD_FDDI) && 3334 (dev->type != ARPHRD_ARCNET) && 3335 (dev->type != ARPHRD_INFINIBAND) && 3336 (dev->type != ARPHRD_IEEE1394) && 3337 (dev->type != ARPHRD_TUNNEL6) && 3338 (dev->type != ARPHRD_6LOWPAN) && 3339 (dev->type != ARPHRD_IP6GRE) && 3340 (dev->type != ARPHRD_IPGRE) && 3341 (dev->type != ARPHRD_TUNNEL) && 3342 (dev->type != ARPHRD_NONE) && 3343 (dev->type != ARPHRD_RAWIP)) { 3344 /* Alas, we support only Ethernet autoconfiguration. */ 3345 return; 3346 } 3347 3348 idev = addrconf_add_dev(dev); 3349 if (IS_ERR(idev)) 3350 return; 3351 3352 /* this device type has no EUI support */ 3353 if (dev->type == ARPHRD_NONE && 3354 idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_EUI64) 3355 idev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_RANDOM; 3356 3357 addrconf_addr_gen(idev, false); 3358 } 3359 3360 #if IS_ENABLED(CONFIG_IPV6_SIT) 3361 static void addrconf_sit_config(struct net_device *dev) 3362 { 3363 struct inet6_dev *idev; 3364 3365 ASSERT_RTNL(); 3366 3367 /* 3368 * Configure the tunnel with one of our IPv4 3369 * addresses... we should configure all of 3370 * our v4 addrs in the tunnel 3371 */ 3372 3373 idev = ipv6_find_idev(dev); 3374 if (!idev) { 3375 pr_debug("%s: add_dev failed\n", __func__); 3376 return; 3377 } 3378 3379 if (dev->priv_flags & IFF_ISATAP) { 3380 addrconf_addr_gen(idev, false); 3381 return; 3382 } 3383 3384 sit_add_v4_addrs(idev); 3385 3386 if (dev->flags&IFF_POINTOPOINT) 3387 addrconf_add_mroute(dev); 3388 } 3389 #endif 3390 3391 #if IS_ENABLED(CONFIG_NET_IPGRE) 3392 static void addrconf_gre_config(struct net_device *dev) 3393 { 3394 struct inet6_dev *idev; 3395 3396 ASSERT_RTNL(); 3397 3398 idev = ipv6_find_idev(dev); 3399 if (!idev) { 3400 pr_debug("%s: add_dev failed\n", __func__); 3401 return; 3402 } 3403 3404 addrconf_addr_gen(idev, true); 3405 if (dev->flags & IFF_POINTOPOINT) 3406 addrconf_add_mroute(dev); 3407 } 3408 #endif 3409 3410 static int fixup_permanent_addr(struct net *net, 3411 struct inet6_dev *idev, 3412 struct inet6_ifaddr *ifp) 3413 { 3414 /* !fib6_node means the host route was removed from the 3415 * FIB, for example, if 'lo' device is taken down. In that 3416 * case regenerate the host route. 3417 */ 3418 if (!ifp->rt || !ifp->rt->fib6_node) { 3419 struct fib6_info *f6i, *prev; 3420 3421 f6i = addrconf_f6i_alloc(net, idev, &ifp->addr, false, 3422 GFP_ATOMIC); 3423 if (IS_ERR(f6i)) 3424 return PTR_ERR(f6i); 3425 3426 /* ifp->rt can be accessed outside of rtnl */ 3427 spin_lock(&ifp->lock); 3428 prev = ifp->rt; 3429 ifp->rt = f6i; 3430 spin_unlock(&ifp->lock); 3431 3432 fib6_info_release(prev); 3433 } 3434 3435 if (!(ifp->flags & IFA_F_NOPREFIXROUTE)) { 3436 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, 3437 ifp->rt_priority, idev->dev, 0, 0, 3438 GFP_ATOMIC); 3439 } 3440 3441 if (ifp->state == INET6_IFADDR_STATE_PREDAD) 3442 addrconf_dad_start(ifp); 3443 3444 return 0; 3445 } 3446 3447 static void addrconf_permanent_addr(struct net *net, struct net_device *dev) 3448 { 3449 struct inet6_ifaddr *ifp, *tmp; 3450 struct inet6_dev *idev; 3451 3452 idev = __in6_dev_get(dev); 3453 if (!idev) 3454 return; 3455 3456 write_lock_bh(&idev->lock); 3457 3458 list_for_each_entry_safe(ifp, tmp, &idev->addr_list, if_list) { 3459 if ((ifp->flags & IFA_F_PERMANENT) && 3460 fixup_permanent_addr(net, idev, ifp) < 0) { 3461 write_unlock_bh(&idev->lock); 3462 in6_ifa_hold(ifp); 3463 ipv6_del_addr(ifp); 3464 write_lock_bh(&idev->lock); 3465 3466 net_info_ratelimited("%s: Failed to add prefix route for address %pI6c; dropping\n", 3467 idev->dev->name, &ifp->addr); 3468 } 3469 } 3470 3471 write_unlock_bh(&idev->lock); 3472 } 3473 3474 static int addrconf_notify(struct notifier_block *this, unsigned long event, 3475 void *ptr) 3476 { 3477 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 3478 struct netdev_notifier_change_info *change_info; 3479 struct netdev_notifier_changeupper_info *info; 3480 struct inet6_dev *idev = __in6_dev_get(dev); 3481 struct net *net = dev_net(dev); 3482 int run_pending = 0; 3483 int err; 3484 3485 switch (event) { 3486 case NETDEV_REGISTER: 3487 if (!idev && dev->mtu >= IPV6_MIN_MTU) { 3488 idev = ipv6_add_dev(dev); 3489 if (IS_ERR(idev)) 3490 return notifier_from_errno(PTR_ERR(idev)); 3491 } 3492 break; 3493 3494 case NETDEV_CHANGEMTU: 3495 /* if MTU under IPV6_MIN_MTU stop IPv6 on this interface. */ 3496 if (dev->mtu < IPV6_MIN_MTU) { 3497 addrconf_ifdown(dev, dev != net->loopback_dev); 3498 break; 3499 } 3500 3501 if (idev) { 3502 rt6_mtu_change(dev, dev->mtu); 3503 idev->cnf.mtu6 = dev->mtu; 3504 break; 3505 } 3506 3507 /* allocate new idev */ 3508 idev = ipv6_add_dev(dev); 3509 if (IS_ERR(idev)) 3510 break; 3511 3512 /* device is still not ready */ 3513 if (!(idev->if_flags & IF_READY)) 3514 break; 3515 3516 run_pending = 1; 3517 3518 /* fall through */ 3519 3520 case NETDEV_UP: 3521 case NETDEV_CHANGE: 3522 if (dev->flags & IFF_SLAVE) 3523 break; 3524 3525 if (idev && idev->cnf.disable_ipv6) 3526 break; 3527 3528 if (event == NETDEV_UP) { 3529 /* restore routes for permanent addresses */ 3530 addrconf_permanent_addr(net, dev); 3531 3532 if (!addrconf_link_ready(dev)) { 3533 /* device is not ready yet. */ 3534 pr_debug("ADDRCONF(NETDEV_UP): %s: link is not ready\n", 3535 dev->name); 3536 break; 3537 } 3538 3539 if (!idev && dev->mtu >= IPV6_MIN_MTU) 3540 idev = ipv6_add_dev(dev); 3541 3542 if (!IS_ERR_OR_NULL(idev)) { 3543 idev->if_flags |= IF_READY; 3544 run_pending = 1; 3545 } 3546 } else if (event == NETDEV_CHANGE) { 3547 if (!addrconf_link_ready(dev)) { 3548 /* device is still not ready. */ 3549 rt6_sync_down_dev(dev, event); 3550 break; 3551 } 3552 3553 if (!IS_ERR_OR_NULL(idev)) { 3554 if (idev->if_flags & IF_READY) { 3555 /* device is already configured - 3556 * but resend MLD reports, we might 3557 * have roamed and need to update 3558 * multicast snooping switches 3559 */ 3560 ipv6_mc_up(idev); 3561 change_info = ptr; 3562 if (change_info->flags_changed & IFF_NOARP) 3563 addrconf_dad_run(idev, true); 3564 rt6_sync_up(dev, RTNH_F_LINKDOWN); 3565 break; 3566 } 3567 idev->if_flags |= IF_READY; 3568 } 3569 3570 pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n", 3571 dev->name); 3572 3573 run_pending = 1; 3574 } 3575 3576 switch (dev->type) { 3577 #if IS_ENABLED(CONFIG_IPV6_SIT) 3578 case ARPHRD_SIT: 3579 addrconf_sit_config(dev); 3580 break; 3581 #endif 3582 #if IS_ENABLED(CONFIG_NET_IPGRE) 3583 case ARPHRD_IPGRE: 3584 addrconf_gre_config(dev); 3585 break; 3586 #endif 3587 case ARPHRD_LOOPBACK: 3588 init_loopback(dev); 3589 break; 3590 3591 default: 3592 addrconf_dev_config(dev); 3593 break; 3594 } 3595 3596 if (!IS_ERR_OR_NULL(idev)) { 3597 if (run_pending) 3598 addrconf_dad_run(idev, false); 3599 3600 /* Device has an address by now */ 3601 rt6_sync_up(dev, RTNH_F_DEAD); 3602 3603 /* 3604 * If the MTU changed during the interface down, 3605 * when the interface up, the changed MTU must be 3606 * reflected in the idev as well as routers. 3607 */ 3608 if (idev->cnf.mtu6 != dev->mtu && 3609 dev->mtu >= IPV6_MIN_MTU) { 3610 rt6_mtu_change(dev, dev->mtu); 3611 idev->cnf.mtu6 = dev->mtu; 3612 } 3613 idev->tstamp = jiffies; 3614 inet6_ifinfo_notify(RTM_NEWLINK, idev); 3615 3616 /* 3617 * If the changed mtu during down is lower than 3618 * IPV6_MIN_MTU stop IPv6 on this interface. 3619 */ 3620 if (dev->mtu < IPV6_MIN_MTU) 3621 addrconf_ifdown(dev, dev != net->loopback_dev); 3622 } 3623 break; 3624 3625 case NETDEV_DOWN: 3626 case NETDEV_UNREGISTER: 3627 /* 3628 * Remove all addresses from this interface. 3629 */ 3630 addrconf_ifdown(dev, event != NETDEV_DOWN); 3631 break; 3632 3633 case NETDEV_CHANGENAME: 3634 if (idev) { 3635 snmp6_unregister_dev(idev); 3636 addrconf_sysctl_unregister(idev); 3637 err = addrconf_sysctl_register(idev); 3638 if (err) 3639 return notifier_from_errno(err); 3640 err = snmp6_register_dev(idev); 3641 if (err) { 3642 addrconf_sysctl_unregister(idev); 3643 return notifier_from_errno(err); 3644 } 3645 } 3646 break; 3647 3648 case NETDEV_PRE_TYPE_CHANGE: 3649 case NETDEV_POST_TYPE_CHANGE: 3650 if (idev) 3651 addrconf_type_change(dev, event); 3652 break; 3653 3654 case NETDEV_CHANGEUPPER: 3655 info = ptr; 3656 3657 /* flush all routes if dev is linked to or unlinked from 3658 * an L3 master device (e.g., VRF) 3659 */ 3660 if (info->upper_dev && netif_is_l3_master(info->upper_dev)) 3661 addrconf_ifdown(dev, 0); 3662 } 3663 3664 return NOTIFY_OK; 3665 } 3666 3667 /* 3668 * addrconf module should be notified of a device going up 3669 */ 3670 static struct notifier_block ipv6_dev_notf = { 3671 .notifier_call = addrconf_notify, 3672 .priority = ADDRCONF_NOTIFY_PRIORITY, 3673 }; 3674 3675 static void addrconf_type_change(struct net_device *dev, unsigned long event) 3676 { 3677 struct inet6_dev *idev; 3678 ASSERT_RTNL(); 3679 3680 idev = __in6_dev_get(dev); 3681 3682 if (event == NETDEV_POST_TYPE_CHANGE) 3683 ipv6_mc_remap(idev); 3684 else if (event == NETDEV_PRE_TYPE_CHANGE) 3685 ipv6_mc_unmap(idev); 3686 } 3687 3688 static bool addr_is_local(const struct in6_addr *addr) 3689 { 3690 return ipv6_addr_type(addr) & 3691 (IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK); 3692 } 3693 3694 static int addrconf_ifdown(struct net_device *dev, int how) 3695 { 3696 unsigned long event = how ? NETDEV_UNREGISTER : NETDEV_DOWN; 3697 struct net *net = dev_net(dev); 3698 struct inet6_dev *idev; 3699 struct inet6_ifaddr *ifa, *tmp; 3700 bool keep_addr = false; 3701 int state, i; 3702 3703 ASSERT_RTNL(); 3704 3705 rt6_disable_ip(dev, event); 3706 3707 idev = __in6_dev_get(dev); 3708 if (!idev) 3709 return -ENODEV; 3710 3711 /* 3712 * Step 1: remove reference to ipv6 device from parent device. 3713 * Do not dev_put! 3714 */ 3715 if (how) { 3716 idev->dead = 1; 3717 3718 /* protected by rtnl_lock */ 3719 RCU_INIT_POINTER(dev->ip6_ptr, NULL); 3720 3721 /* Step 1.5: remove snmp6 entry */ 3722 snmp6_unregister_dev(idev); 3723 3724 } 3725 3726 /* combine the user config with event to determine if permanent 3727 * addresses are to be removed from address hash table 3728 */ 3729 if (!how && !idev->cnf.disable_ipv6) { 3730 /* aggregate the system setting and interface setting */ 3731 int _keep_addr = net->ipv6.devconf_all->keep_addr_on_down; 3732 3733 if (!_keep_addr) 3734 _keep_addr = idev->cnf.keep_addr_on_down; 3735 3736 keep_addr = (_keep_addr > 0); 3737 } 3738 3739 /* Step 2: clear hash table */ 3740 for (i = 0; i < IN6_ADDR_HSIZE; i++) { 3741 struct hlist_head *h = &inet6_addr_lst[i]; 3742 3743 spin_lock_bh(&addrconf_hash_lock); 3744 restart: 3745 hlist_for_each_entry_rcu(ifa, h, addr_lst) { 3746 if (ifa->idev == idev) { 3747 addrconf_del_dad_work(ifa); 3748 /* combined flag + permanent flag decide if 3749 * address is retained on a down event 3750 */ 3751 if (!keep_addr || 3752 !(ifa->flags & IFA_F_PERMANENT) || 3753 addr_is_local(&ifa->addr)) { 3754 hlist_del_init_rcu(&ifa->addr_lst); 3755 goto restart; 3756 } 3757 } 3758 } 3759 spin_unlock_bh(&addrconf_hash_lock); 3760 } 3761 3762 write_lock_bh(&idev->lock); 3763 3764 addrconf_del_rs_timer(idev); 3765 3766 /* Step 2: clear flags for stateless addrconf */ 3767 if (!how) 3768 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY); 3769 3770 /* Step 3: clear tempaddr list */ 3771 while (!list_empty(&idev->tempaddr_list)) { 3772 ifa = list_first_entry(&idev->tempaddr_list, 3773 struct inet6_ifaddr, tmp_list); 3774 list_del(&ifa->tmp_list); 3775 write_unlock_bh(&idev->lock); 3776 spin_lock_bh(&ifa->lock); 3777 3778 if (ifa->ifpub) { 3779 in6_ifa_put(ifa->ifpub); 3780 ifa->ifpub = NULL; 3781 } 3782 spin_unlock_bh(&ifa->lock); 3783 in6_ifa_put(ifa); 3784 write_lock_bh(&idev->lock); 3785 } 3786 3787 list_for_each_entry_safe(ifa, tmp, &idev->addr_list, if_list) { 3788 struct fib6_info *rt = NULL; 3789 bool keep; 3790 3791 addrconf_del_dad_work(ifa); 3792 3793 keep = keep_addr && (ifa->flags & IFA_F_PERMANENT) && 3794 !addr_is_local(&ifa->addr); 3795 3796 write_unlock_bh(&idev->lock); 3797 spin_lock_bh(&ifa->lock); 3798 3799 if (keep) { 3800 /* set state to skip the notifier below */ 3801 state = INET6_IFADDR_STATE_DEAD; 3802 ifa->state = INET6_IFADDR_STATE_PREDAD; 3803 if (!(ifa->flags & IFA_F_NODAD)) 3804 ifa->flags |= IFA_F_TENTATIVE; 3805 3806 rt = ifa->rt; 3807 ifa->rt = NULL; 3808 } else { 3809 state = ifa->state; 3810 ifa->state = INET6_IFADDR_STATE_DEAD; 3811 } 3812 3813 spin_unlock_bh(&ifa->lock); 3814 3815 if (rt) 3816 ip6_del_rt(net, rt); 3817 3818 if (state != INET6_IFADDR_STATE_DEAD) { 3819 __ipv6_ifa_notify(RTM_DELADDR, ifa); 3820 inet6addr_notifier_call_chain(NETDEV_DOWN, ifa); 3821 } else { 3822 if (idev->cnf.forwarding) 3823 addrconf_leave_anycast(ifa); 3824 addrconf_leave_solict(ifa->idev, &ifa->addr); 3825 } 3826 3827 write_lock_bh(&idev->lock); 3828 if (!keep) { 3829 list_del_rcu(&ifa->if_list); 3830 in6_ifa_put(ifa); 3831 } 3832 } 3833 3834 write_unlock_bh(&idev->lock); 3835 3836 /* Step 5: Discard anycast and multicast list */ 3837 if (how) { 3838 ipv6_ac_destroy_dev(idev); 3839 ipv6_mc_destroy_dev(idev); 3840 } else { 3841 ipv6_mc_down(idev); 3842 } 3843 3844 idev->tstamp = jiffies; 3845 3846 /* Last: Shot the device (if unregistered) */ 3847 if (how) { 3848 addrconf_sysctl_unregister(idev); 3849 neigh_parms_release(&nd_tbl, idev->nd_parms); 3850 neigh_ifdown(&nd_tbl, dev); 3851 in6_dev_put(idev); 3852 } 3853 return 0; 3854 } 3855 3856 static void addrconf_rs_timer(struct timer_list *t) 3857 { 3858 struct inet6_dev *idev = from_timer(idev, t, rs_timer); 3859 struct net_device *dev = idev->dev; 3860 struct in6_addr lladdr; 3861 3862 write_lock(&idev->lock); 3863 if (idev->dead || !(idev->if_flags & IF_READY)) 3864 goto out; 3865 3866 if (!ipv6_accept_ra(idev)) 3867 goto out; 3868 3869 /* Announcement received after solicitation was sent */ 3870 if (idev->if_flags & IF_RA_RCVD) 3871 goto out; 3872 3873 if (idev->rs_probes++ < idev->cnf.rtr_solicits || idev->cnf.rtr_solicits < 0) { 3874 write_unlock(&idev->lock); 3875 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE)) 3876 ndisc_send_rs(dev, &lladdr, 3877 &in6addr_linklocal_allrouters); 3878 else 3879 goto put; 3880 3881 write_lock(&idev->lock); 3882 idev->rs_interval = rfc3315_s14_backoff_update( 3883 idev->rs_interval, idev->cnf.rtr_solicit_max_interval); 3884 /* The wait after the last probe can be shorter */ 3885 addrconf_mod_rs_timer(idev, (idev->rs_probes == 3886 idev->cnf.rtr_solicits) ? 3887 idev->cnf.rtr_solicit_delay : 3888 idev->rs_interval); 3889 } else { 3890 /* 3891 * Note: we do not support deprecated "all on-link" 3892 * assumption any longer. 3893 */ 3894 pr_debug("%s: no IPv6 routers present\n", idev->dev->name); 3895 } 3896 3897 out: 3898 write_unlock(&idev->lock); 3899 put: 3900 in6_dev_put(idev); 3901 } 3902 3903 /* 3904 * Duplicate Address Detection 3905 */ 3906 static void addrconf_dad_kick(struct inet6_ifaddr *ifp) 3907 { 3908 unsigned long rand_num; 3909 struct inet6_dev *idev = ifp->idev; 3910 u64 nonce; 3911 3912 if (ifp->flags & IFA_F_OPTIMISTIC) 3913 rand_num = 0; 3914 else 3915 rand_num = prandom_u32() % (idev->cnf.rtr_solicit_delay ? : 1); 3916 3917 nonce = 0; 3918 if (idev->cnf.enhanced_dad || 3919 dev_net(idev->dev)->ipv6.devconf_all->enhanced_dad) { 3920 do 3921 get_random_bytes(&nonce, 6); 3922 while (nonce == 0); 3923 } 3924 ifp->dad_nonce = nonce; 3925 ifp->dad_probes = idev->cnf.dad_transmits; 3926 addrconf_mod_dad_work(ifp, rand_num); 3927 } 3928 3929 static void addrconf_dad_begin(struct inet6_ifaddr *ifp) 3930 { 3931 struct inet6_dev *idev = ifp->idev; 3932 struct net_device *dev = idev->dev; 3933 bool bump_id, notify = false; 3934 struct net *net; 3935 3936 addrconf_join_solict(dev, &ifp->addr); 3937 3938 prandom_seed((__force u32) ifp->addr.s6_addr32[3]); 3939 3940 read_lock_bh(&idev->lock); 3941 spin_lock(&ifp->lock); 3942 if (ifp->state == INET6_IFADDR_STATE_DEAD) 3943 goto out; 3944 3945 net = dev_net(dev); 3946 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) || 3947 (net->ipv6.devconf_all->accept_dad < 1 && 3948 idev->cnf.accept_dad < 1) || 3949 !(ifp->flags&IFA_F_TENTATIVE) || 3950 ifp->flags & IFA_F_NODAD) { 3951 bool send_na = false; 3952 3953 if (ifp->flags & IFA_F_TENTATIVE && 3954 !(ifp->flags & IFA_F_OPTIMISTIC)) 3955 send_na = true; 3956 bump_id = ifp->flags & IFA_F_TENTATIVE; 3957 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED); 3958 spin_unlock(&ifp->lock); 3959 read_unlock_bh(&idev->lock); 3960 3961 addrconf_dad_completed(ifp, bump_id, send_na); 3962 return; 3963 } 3964 3965 if (!(idev->if_flags & IF_READY)) { 3966 spin_unlock(&ifp->lock); 3967 read_unlock_bh(&idev->lock); 3968 /* 3969 * If the device is not ready: 3970 * - keep it tentative if it is a permanent address. 3971 * - otherwise, kill it. 3972 */ 3973 in6_ifa_hold(ifp); 3974 addrconf_dad_stop(ifp, 0); 3975 return; 3976 } 3977 3978 /* 3979 * Optimistic nodes can start receiving 3980 * Frames right away 3981 */ 3982 if (ifp->flags & IFA_F_OPTIMISTIC) { 3983 ip6_ins_rt(net, ifp->rt); 3984 if (ipv6_use_optimistic_addr(net, idev)) { 3985 /* Because optimistic nodes can use this address, 3986 * notify listeners. If DAD fails, RTM_DELADDR is sent. 3987 */ 3988 notify = true; 3989 } 3990 } 3991 3992 addrconf_dad_kick(ifp); 3993 out: 3994 spin_unlock(&ifp->lock); 3995 read_unlock_bh(&idev->lock); 3996 if (notify) 3997 ipv6_ifa_notify(RTM_NEWADDR, ifp); 3998 } 3999 4000 static void addrconf_dad_start(struct inet6_ifaddr *ifp) 4001 { 4002 bool begin_dad = false; 4003 4004 spin_lock_bh(&ifp->lock); 4005 if (ifp->state != INET6_IFADDR_STATE_DEAD) { 4006 ifp->state = INET6_IFADDR_STATE_PREDAD; 4007 begin_dad = true; 4008 } 4009 spin_unlock_bh(&ifp->lock); 4010 4011 if (begin_dad) 4012 addrconf_mod_dad_work(ifp, 0); 4013 } 4014 4015 static void addrconf_dad_work(struct work_struct *w) 4016 { 4017 struct inet6_ifaddr *ifp = container_of(to_delayed_work(w), 4018 struct inet6_ifaddr, 4019 dad_work); 4020 struct inet6_dev *idev = ifp->idev; 4021 bool bump_id, disable_ipv6 = false; 4022 struct in6_addr mcaddr; 4023 4024 enum { 4025 DAD_PROCESS, 4026 DAD_BEGIN, 4027 DAD_ABORT, 4028 } action = DAD_PROCESS; 4029 4030 rtnl_lock(); 4031 4032 spin_lock_bh(&ifp->lock); 4033 if (ifp->state == INET6_IFADDR_STATE_PREDAD) { 4034 action = DAD_BEGIN; 4035 ifp->state = INET6_IFADDR_STATE_DAD; 4036 } else if (ifp->state == INET6_IFADDR_STATE_ERRDAD) { 4037 action = DAD_ABORT; 4038 ifp->state = INET6_IFADDR_STATE_POSTDAD; 4039 4040 if ((dev_net(idev->dev)->ipv6.devconf_all->accept_dad > 1 || 4041 idev->cnf.accept_dad > 1) && 4042 !idev->cnf.disable_ipv6 && 4043 !(ifp->flags & IFA_F_STABLE_PRIVACY)) { 4044 struct in6_addr addr; 4045 4046 addr.s6_addr32[0] = htonl(0xfe800000); 4047 addr.s6_addr32[1] = 0; 4048 4049 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) && 4050 ipv6_addr_equal(&ifp->addr, &addr)) { 4051 /* DAD failed for link-local based on MAC */ 4052 idev->cnf.disable_ipv6 = 1; 4053 4054 pr_info("%s: IPv6 being disabled!\n", 4055 ifp->idev->dev->name); 4056 disable_ipv6 = true; 4057 } 4058 } 4059 } 4060 spin_unlock_bh(&ifp->lock); 4061 4062 if (action == DAD_BEGIN) { 4063 addrconf_dad_begin(ifp); 4064 goto out; 4065 } else if (action == DAD_ABORT) { 4066 in6_ifa_hold(ifp); 4067 addrconf_dad_stop(ifp, 1); 4068 if (disable_ipv6) 4069 addrconf_ifdown(idev->dev, 0); 4070 goto out; 4071 } 4072 4073 if (!ifp->dad_probes && addrconf_dad_end(ifp)) 4074 goto out; 4075 4076 write_lock_bh(&idev->lock); 4077 if (idev->dead || !(idev->if_flags & IF_READY)) { 4078 write_unlock_bh(&idev->lock); 4079 goto out; 4080 } 4081 4082 spin_lock(&ifp->lock); 4083 if (ifp->state == INET6_IFADDR_STATE_DEAD) { 4084 spin_unlock(&ifp->lock); 4085 write_unlock_bh(&idev->lock); 4086 goto out; 4087 } 4088 4089 if (ifp->dad_probes == 0) { 4090 bool send_na = false; 4091 4092 /* 4093 * DAD was successful 4094 */ 4095 4096 if (ifp->flags & IFA_F_TENTATIVE && 4097 !(ifp->flags & IFA_F_OPTIMISTIC)) 4098 send_na = true; 4099 bump_id = ifp->flags & IFA_F_TENTATIVE; 4100 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED); 4101 spin_unlock(&ifp->lock); 4102 write_unlock_bh(&idev->lock); 4103 4104 addrconf_dad_completed(ifp, bump_id, send_na); 4105 4106 goto out; 4107 } 4108 4109 ifp->dad_probes--; 4110 addrconf_mod_dad_work(ifp, 4111 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME)); 4112 spin_unlock(&ifp->lock); 4113 write_unlock_bh(&idev->lock); 4114 4115 /* send a neighbour solicitation for our addr */ 4116 addrconf_addr_solict_mult(&ifp->addr, &mcaddr); 4117 ndisc_send_ns(ifp->idev->dev, &ifp->addr, &mcaddr, &in6addr_any, 4118 ifp->dad_nonce); 4119 out: 4120 in6_ifa_put(ifp); 4121 rtnl_unlock(); 4122 } 4123 4124 /* ifp->idev must be at least read locked */ 4125 static bool ipv6_lonely_lladdr(struct inet6_ifaddr *ifp) 4126 { 4127 struct inet6_ifaddr *ifpiter; 4128 struct inet6_dev *idev = ifp->idev; 4129 4130 list_for_each_entry_reverse(ifpiter, &idev->addr_list, if_list) { 4131 if (ifpiter->scope > IFA_LINK) 4132 break; 4133 if (ifp != ifpiter && ifpiter->scope == IFA_LINK && 4134 (ifpiter->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE| 4135 IFA_F_OPTIMISTIC|IFA_F_DADFAILED)) == 4136 IFA_F_PERMANENT) 4137 return false; 4138 } 4139 return true; 4140 } 4141 4142 static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id, 4143 bool send_na) 4144 { 4145 struct net_device *dev = ifp->idev->dev; 4146 struct in6_addr lladdr; 4147 bool send_rs, send_mld; 4148 4149 addrconf_del_dad_work(ifp); 4150 4151 /* 4152 * Configure the address for reception. Now it is valid. 4153 */ 4154 4155 ipv6_ifa_notify(RTM_NEWADDR, ifp); 4156 4157 /* If added prefix is link local and we are prepared to process 4158 router advertisements, start sending router solicitations. 4159 */ 4160 4161 read_lock_bh(&ifp->idev->lock); 4162 send_mld = ifp->scope == IFA_LINK && ipv6_lonely_lladdr(ifp); 4163 send_rs = send_mld && 4164 ipv6_accept_ra(ifp->idev) && 4165 ifp->idev->cnf.rtr_solicits != 0 && 4166 (dev->flags&IFF_LOOPBACK) == 0; 4167 read_unlock_bh(&ifp->idev->lock); 4168 4169 /* While dad is in progress mld report's source address is in6_addrany. 4170 * Resend with proper ll now. 4171 */ 4172 if (send_mld) 4173 ipv6_mc_dad_complete(ifp->idev); 4174 4175 /* send unsolicited NA if enabled */ 4176 if (send_na && 4177 (ifp->idev->cnf.ndisc_notify || 4178 dev_net(dev)->ipv6.devconf_all->ndisc_notify)) { 4179 ndisc_send_na(dev, &in6addr_linklocal_allnodes, &ifp->addr, 4180 /*router=*/ !!ifp->idev->cnf.forwarding, 4181 /*solicited=*/ false, /*override=*/ true, 4182 /*inc_opt=*/ true); 4183 } 4184 4185 if (send_rs) { 4186 /* 4187 * If a host as already performed a random delay 4188 * [...] as part of DAD [...] there is no need 4189 * to delay again before sending the first RS 4190 */ 4191 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE)) 4192 return; 4193 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters); 4194 4195 write_lock_bh(&ifp->idev->lock); 4196 spin_lock(&ifp->lock); 4197 ifp->idev->rs_interval = rfc3315_s14_backoff_init( 4198 ifp->idev->cnf.rtr_solicit_interval); 4199 ifp->idev->rs_probes = 1; 4200 ifp->idev->if_flags |= IF_RS_SENT; 4201 addrconf_mod_rs_timer(ifp->idev, ifp->idev->rs_interval); 4202 spin_unlock(&ifp->lock); 4203 write_unlock_bh(&ifp->idev->lock); 4204 } 4205 4206 if (bump_id) 4207 rt_genid_bump_ipv6(dev_net(dev)); 4208 4209 /* Make sure that a new temporary address will be created 4210 * before this temporary address becomes deprecated. 4211 */ 4212 if (ifp->flags & IFA_F_TEMPORARY) 4213 addrconf_verify_rtnl(); 4214 } 4215 4216 static void addrconf_dad_run(struct inet6_dev *idev, bool restart) 4217 { 4218 struct inet6_ifaddr *ifp; 4219 4220 read_lock_bh(&idev->lock); 4221 list_for_each_entry(ifp, &idev->addr_list, if_list) { 4222 spin_lock(&ifp->lock); 4223 if ((ifp->flags & IFA_F_TENTATIVE && 4224 ifp->state == INET6_IFADDR_STATE_DAD) || restart) { 4225 if (restart) 4226 ifp->state = INET6_IFADDR_STATE_PREDAD; 4227 addrconf_dad_kick(ifp); 4228 } 4229 spin_unlock(&ifp->lock); 4230 } 4231 read_unlock_bh(&idev->lock); 4232 } 4233 4234 #ifdef CONFIG_PROC_FS 4235 struct if6_iter_state { 4236 struct seq_net_private p; 4237 int bucket; 4238 int offset; 4239 }; 4240 4241 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos) 4242 { 4243 struct if6_iter_state *state = seq->private; 4244 struct net *net = seq_file_net(seq); 4245 struct inet6_ifaddr *ifa = NULL; 4246 int p = 0; 4247 4248 /* initial bucket if pos is 0 */ 4249 if (pos == 0) { 4250 state->bucket = 0; 4251 state->offset = 0; 4252 } 4253 4254 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) { 4255 hlist_for_each_entry_rcu(ifa, &inet6_addr_lst[state->bucket], 4256 addr_lst) { 4257 if (!net_eq(dev_net(ifa->idev->dev), net)) 4258 continue; 4259 /* sync with offset */ 4260 if (p < state->offset) { 4261 p++; 4262 continue; 4263 } 4264 return ifa; 4265 } 4266 4267 /* prepare for next bucket */ 4268 state->offset = 0; 4269 p = 0; 4270 } 4271 return NULL; 4272 } 4273 4274 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, 4275 struct inet6_ifaddr *ifa) 4276 { 4277 struct if6_iter_state *state = seq->private; 4278 struct net *net = seq_file_net(seq); 4279 4280 hlist_for_each_entry_continue_rcu(ifa, addr_lst) { 4281 if (!net_eq(dev_net(ifa->idev->dev), net)) 4282 continue; 4283 state->offset++; 4284 return ifa; 4285 } 4286 4287 state->offset = 0; 4288 while (++state->bucket < IN6_ADDR_HSIZE) { 4289 hlist_for_each_entry_rcu(ifa, 4290 &inet6_addr_lst[state->bucket], addr_lst) { 4291 if (!net_eq(dev_net(ifa->idev->dev), net)) 4292 continue; 4293 return ifa; 4294 } 4295 } 4296 4297 return NULL; 4298 } 4299 4300 static void *if6_seq_start(struct seq_file *seq, loff_t *pos) 4301 __acquires(rcu) 4302 { 4303 rcu_read_lock(); 4304 return if6_get_first(seq, *pos); 4305 } 4306 4307 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos) 4308 { 4309 struct inet6_ifaddr *ifa; 4310 4311 ifa = if6_get_next(seq, v); 4312 ++*pos; 4313 return ifa; 4314 } 4315 4316 static void if6_seq_stop(struct seq_file *seq, void *v) 4317 __releases(rcu) 4318 { 4319 rcu_read_unlock(); 4320 } 4321 4322 static int if6_seq_show(struct seq_file *seq, void *v) 4323 { 4324 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v; 4325 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n", 4326 &ifp->addr, 4327 ifp->idev->dev->ifindex, 4328 ifp->prefix_len, 4329 ifp->scope, 4330 (u8) ifp->flags, 4331 ifp->idev->dev->name); 4332 return 0; 4333 } 4334 4335 static const struct seq_operations if6_seq_ops = { 4336 .start = if6_seq_start, 4337 .next = if6_seq_next, 4338 .show = if6_seq_show, 4339 .stop = if6_seq_stop, 4340 }; 4341 4342 static int __net_init if6_proc_net_init(struct net *net) 4343 { 4344 if (!proc_create_net("if_inet6", 0444, net->proc_net, &if6_seq_ops, 4345 sizeof(struct if6_iter_state))) 4346 return -ENOMEM; 4347 return 0; 4348 } 4349 4350 static void __net_exit if6_proc_net_exit(struct net *net) 4351 { 4352 remove_proc_entry("if_inet6", net->proc_net); 4353 } 4354 4355 static struct pernet_operations if6_proc_net_ops = { 4356 .init = if6_proc_net_init, 4357 .exit = if6_proc_net_exit, 4358 }; 4359 4360 int __init if6_proc_init(void) 4361 { 4362 return register_pernet_subsys(&if6_proc_net_ops); 4363 } 4364 4365 void if6_proc_exit(void) 4366 { 4367 unregister_pernet_subsys(&if6_proc_net_ops); 4368 } 4369 #endif /* CONFIG_PROC_FS */ 4370 4371 #if IS_ENABLED(CONFIG_IPV6_MIP6) 4372 /* Check if address is a home address configured on any interface. */ 4373 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr) 4374 { 4375 unsigned int hash = inet6_addr_hash(net, addr); 4376 struct inet6_ifaddr *ifp = NULL; 4377 int ret = 0; 4378 4379 rcu_read_lock(); 4380 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) { 4381 if (!net_eq(dev_net(ifp->idev->dev), net)) 4382 continue; 4383 if (ipv6_addr_equal(&ifp->addr, addr) && 4384 (ifp->flags & IFA_F_HOMEADDRESS)) { 4385 ret = 1; 4386 break; 4387 } 4388 } 4389 rcu_read_unlock(); 4390 return ret; 4391 } 4392 #endif 4393 4394 /* 4395 * Periodic address status verification 4396 */ 4397 4398 static void addrconf_verify_rtnl(void) 4399 { 4400 unsigned long now, next, next_sec, next_sched; 4401 struct inet6_ifaddr *ifp; 4402 int i; 4403 4404 ASSERT_RTNL(); 4405 4406 rcu_read_lock_bh(); 4407 now = jiffies; 4408 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY); 4409 4410 cancel_delayed_work(&addr_chk_work); 4411 4412 for (i = 0; i < IN6_ADDR_HSIZE; i++) { 4413 restart: 4414 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[i], addr_lst) { 4415 unsigned long age; 4416 4417 /* When setting preferred_lft to a value not zero or 4418 * infinity, while valid_lft is infinity 4419 * IFA_F_PERMANENT has a non-infinity life time. 4420 */ 4421 if ((ifp->flags & IFA_F_PERMANENT) && 4422 (ifp->prefered_lft == INFINITY_LIFE_TIME)) 4423 continue; 4424 4425 spin_lock(&ifp->lock); 4426 /* We try to batch several events at once. */ 4427 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ; 4428 4429 if (ifp->valid_lft != INFINITY_LIFE_TIME && 4430 age >= ifp->valid_lft) { 4431 spin_unlock(&ifp->lock); 4432 in6_ifa_hold(ifp); 4433 ipv6_del_addr(ifp); 4434 goto restart; 4435 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) { 4436 spin_unlock(&ifp->lock); 4437 continue; 4438 } else if (age >= ifp->prefered_lft) { 4439 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */ 4440 int deprecate = 0; 4441 4442 if (!(ifp->flags&IFA_F_DEPRECATED)) { 4443 deprecate = 1; 4444 ifp->flags |= IFA_F_DEPRECATED; 4445 } 4446 4447 if ((ifp->valid_lft != INFINITY_LIFE_TIME) && 4448 (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))) 4449 next = ifp->tstamp + ifp->valid_lft * HZ; 4450 4451 spin_unlock(&ifp->lock); 4452 4453 if (deprecate) { 4454 in6_ifa_hold(ifp); 4455 4456 ipv6_ifa_notify(0, ifp); 4457 in6_ifa_put(ifp); 4458 goto restart; 4459 } 4460 } else if ((ifp->flags&IFA_F_TEMPORARY) && 4461 !(ifp->flags&IFA_F_TENTATIVE)) { 4462 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry * 4463 ifp->idev->cnf.dad_transmits * 4464 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME) / HZ; 4465 4466 if (age >= ifp->prefered_lft - regen_advance) { 4467 struct inet6_ifaddr *ifpub = ifp->ifpub; 4468 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 4469 next = ifp->tstamp + ifp->prefered_lft * HZ; 4470 if (!ifp->regen_count && ifpub) { 4471 ifp->regen_count++; 4472 in6_ifa_hold(ifp); 4473 in6_ifa_hold(ifpub); 4474 spin_unlock(&ifp->lock); 4475 4476 spin_lock(&ifpub->lock); 4477 ifpub->regen_count = 0; 4478 spin_unlock(&ifpub->lock); 4479 rcu_read_unlock_bh(); 4480 ipv6_create_tempaddr(ifpub, ifp, true); 4481 in6_ifa_put(ifpub); 4482 in6_ifa_put(ifp); 4483 rcu_read_lock_bh(); 4484 goto restart; 4485 } 4486 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next)) 4487 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ; 4488 spin_unlock(&ifp->lock); 4489 } else { 4490 /* ifp->prefered_lft <= ifp->valid_lft */ 4491 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 4492 next = ifp->tstamp + ifp->prefered_lft * HZ; 4493 spin_unlock(&ifp->lock); 4494 } 4495 } 4496 } 4497 4498 next_sec = round_jiffies_up(next); 4499 next_sched = next; 4500 4501 /* If rounded timeout is accurate enough, accept it. */ 4502 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ)) 4503 next_sched = next_sec; 4504 4505 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */ 4506 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX)) 4507 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX; 4508 4509 pr_debug("now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n", 4510 now, next, next_sec, next_sched); 4511 mod_delayed_work(addrconf_wq, &addr_chk_work, next_sched - now); 4512 rcu_read_unlock_bh(); 4513 } 4514 4515 static void addrconf_verify_work(struct work_struct *w) 4516 { 4517 rtnl_lock(); 4518 addrconf_verify_rtnl(); 4519 rtnl_unlock(); 4520 } 4521 4522 static void addrconf_verify(void) 4523 { 4524 mod_delayed_work(addrconf_wq, &addr_chk_work, 0); 4525 } 4526 4527 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local, 4528 struct in6_addr **peer_pfx) 4529 { 4530 struct in6_addr *pfx = NULL; 4531 4532 *peer_pfx = NULL; 4533 4534 if (addr) 4535 pfx = nla_data(addr); 4536 4537 if (local) { 4538 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx))) 4539 *peer_pfx = pfx; 4540 pfx = nla_data(local); 4541 } 4542 4543 return pfx; 4544 } 4545 4546 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = { 4547 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) }, 4548 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) }, 4549 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) }, 4550 [IFA_FLAGS] = { .len = sizeof(u32) }, 4551 [IFA_RT_PRIORITY] = { .len = sizeof(u32) }, 4552 [IFA_TARGET_NETNSID] = { .type = NLA_S32 }, 4553 }; 4554 4555 static int 4556 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, 4557 struct netlink_ext_ack *extack) 4558 { 4559 struct net *net = sock_net(skb->sk); 4560 struct ifaddrmsg *ifm; 4561 struct nlattr *tb[IFA_MAX+1]; 4562 struct in6_addr *pfx, *peer_pfx; 4563 u32 ifa_flags; 4564 int err; 4565 4566 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy, 4567 extack); 4568 if (err < 0) 4569 return err; 4570 4571 ifm = nlmsg_data(nlh); 4572 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx); 4573 if (!pfx) 4574 return -EINVAL; 4575 4576 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags; 4577 4578 /* We ignore other flags so far. */ 4579 ifa_flags &= IFA_F_MANAGETEMPADDR; 4580 4581 return inet6_addr_del(net, ifm->ifa_index, ifa_flags, pfx, 4582 ifm->ifa_prefixlen); 4583 } 4584 4585 static int modify_prefix_route(struct inet6_ifaddr *ifp, 4586 unsigned long expires, u32 flags) 4587 { 4588 struct fib6_info *f6i; 4589 u32 prio; 4590 4591 f6i = addrconf_get_prefix_route(&ifp->addr, 4592 ifp->prefix_len, 4593 ifp->idev->dev, 4594 0, RTF_GATEWAY | RTF_DEFAULT); 4595 if (!f6i) 4596 return -ENOENT; 4597 4598 prio = ifp->rt_priority ? : IP6_RT_PRIO_ADDRCONF; 4599 if (f6i->fib6_metric != prio) { 4600 /* delete old one */ 4601 ip6_del_rt(dev_net(ifp->idev->dev), f6i); 4602 4603 /* add new one */ 4604 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, 4605 ifp->rt_priority, ifp->idev->dev, 4606 expires, flags, GFP_KERNEL); 4607 } else { 4608 if (!expires) 4609 fib6_clean_expires(f6i); 4610 else 4611 fib6_set_expires(f6i, expires); 4612 4613 fib6_info_release(f6i); 4614 } 4615 4616 return 0; 4617 } 4618 4619 static int inet6_addr_modify(struct inet6_ifaddr *ifp, struct ifa6_config *cfg) 4620 { 4621 u32 flags; 4622 clock_t expires; 4623 unsigned long timeout; 4624 bool was_managetempaddr; 4625 bool had_prefixroute; 4626 4627 ASSERT_RTNL(); 4628 4629 if (!cfg->valid_lft || cfg->preferred_lft > cfg->valid_lft) 4630 return -EINVAL; 4631 4632 if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR && 4633 (ifp->flags & IFA_F_TEMPORARY || ifp->prefix_len != 64)) 4634 return -EINVAL; 4635 4636 if (!(ifp->flags & IFA_F_TENTATIVE) || ifp->flags & IFA_F_DADFAILED) 4637 cfg->ifa_flags &= ~IFA_F_OPTIMISTIC; 4638 4639 timeout = addrconf_timeout_fixup(cfg->valid_lft, HZ); 4640 if (addrconf_finite_timeout(timeout)) { 4641 expires = jiffies_to_clock_t(timeout * HZ); 4642 cfg->valid_lft = timeout; 4643 flags = RTF_EXPIRES; 4644 } else { 4645 expires = 0; 4646 flags = 0; 4647 cfg->ifa_flags |= IFA_F_PERMANENT; 4648 } 4649 4650 timeout = addrconf_timeout_fixup(cfg->preferred_lft, HZ); 4651 if (addrconf_finite_timeout(timeout)) { 4652 if (timeout == 0) 4653 cfg->ifa_flags |= IFA_F_DEPRECATED; 4654 cfg->preferred_lft = timeout; 4655 } 4656 4657 spin_lock_bh(&ifp->lock); 4658 was_managetempaddr = ifp->flags & IFA_F_MANAGETEMPADDR; 4659 had_prefixroute = ifp->flags & IFA_F_PERMANENT && 4660 !(ifp->flags & IFA_F_NOPREFIXROUTE); 4661 ifp->flags &= ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | 4662 IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR | 4663 IFA_F_NOPREFIXROUTE); 4664 ifp->flags |= cfg->ifa_flags; 4665 ifp->tstamp = jiffies; 4666 ifp->valid_lft = cfg->valid_lft; 4667 ifp->prefered_lft = cfg->preferred_lft; 4668 4669 if (cfg->rt_priority && cfg->rt_priority != ifp->rt_priority) 4670 ifp->rt_priority = cfg->rt_priority; 4671 4672 spin_unlock_bh(&ifp->lock); 4673 if (!(ifp->flags&IFA_F_TENTATIVE)) 4674 ipv6_ifa_notify(0, ifp); 4675 4676 if (!(cfg->ifa_flags & IFA_F_NOPREFIXROUTE)) { 4677 int rc = -ENOENT; 4678 4679 if (had_prefixroute) 4680 rc = modify_prefix_route(ifp, expires, flags); 4681 4682 /* prefix route could have been deleted; if so restore it */ 4683 if (rc == -ENOENT) { 4684 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, 4685 ifp->rt_priority, ifp->idev->dev, 4686 expires, flags, GFP_KERNEL); 4687 } 4688 } else if (had_prefixroute) { 4689 enum cleanup_prefix_rt_t action; 4690 unsigned long rt_expires; 4691 4692 write_lock_bh(&ifp->idev->lock); 4693 action = check_cleanup_prefix_route(ifp, &rt_expires); 4694 write_unlock_bh(&ifp->idev->lock); 4695 4696 if (action != CLEANUP_PREFIX_RT_NOP) { 4697 cleanup_prefix_route(ifp, rt_expires, 4698 action == CLEANUP_PREFIX_RT_DEL); 4699 } 4700 } 4701 4702 if (was_managetempaddr || ifp->flags & IFA_F_MANAGETEMPADDR) { 4703 if (was_managetempaddr && 4704 !(ifp->flags & IFA_F_MANAGETEMPADDR)) { 4705 cfg->valid_lft = 0; 4706 cfg->preferred_lft = 0; 4707 } 4708 manage_tempaddrs(ifp->idev, ifp, cfg->valid_lft, 4709 cfg->preferred_lft, !was_managetempaddr, 4710 jiffies); 4711 } 4712 4713 addrconf_verify_rtnl(); 4714 4715 return 0; 4716 } 4717 4718 static int 4719 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, 4720 struct netlink_ext_ack *extack) 4721 { 4722 struct net *net = sock_net(skb->sk); 4723 struct ifaddrmsg *ifm; 4724 struct nlattr *tb[IFA_MAX+1]; 4725 struct in6_addr *peer_pfx; 4726 struct inet6_ifaddr *ifa; 4727 struct net_device *dev; 4728 struct inet6_dev *idev; 4729 struct ifa6_config cfg; 4730 int err; 4731 4732 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy, 4733 extack); 4734 if (err < 0) 4735 return err; 4736 4737 memset(&cfg, 0, sizeof(cfg)); 4738 4739 ifm = nlmsg_data(nlh); 4740 cfg.pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx); 4741 if (!cfg.pfx) 4742 return -EINVAL; 4743 4744 cfg.peer_pfx = peer_pfx; 4745 cfg.plen = ifm->ifa_prefixlen; 4746 if (tb[IFA_RT_PRIORITY]) 4747 cfg.rt_priority = nla_get_u32(tb[IFA_RT_PRIORITY]); 4748 4749 cfg.valid_lft = INFINITY_LIFE_TIME; 4750 cfg.preferred_lft = INFINITY_LIFE_TIME; 4751 4752 if (tb[IFA_CACHEINFO]) { 4753 struct ifa_cacheinfo *ci; 4754 4755 ci = nla_data(tb[IFA_CACHEINFO]); 4756 cfg.valid_lft = ci->ifa_valid; 4757 cfg.preferred_lft = ci->ifa_prefered; 4758 } 4759 4760 dev = __dev_get_by_index(net, ifm->ifa_index); 4761 if (!dev) 4762 return -ENODEV; 4763 4764 if (tb[IFA_FLAGS]) 4765 cfg.ifa_flags = nla_get_u32(tb[IFA_FLAGS]); 4766 else 4767 cfg.ifa_flags = ifm->ifa_flags; 4768 4769 /* We ignore other flags so far. */ 4770 cfg.ifa_flags &= IFA_F_NODAD | IFA_F_HOMEADDRESS | 4771 IFA_F_MANAGETEMPADDR | IFA_F_NOPREFIXROUTE | 4772 IFA_F_MCAUTOJOIN | IFA_F_OPTIMISTIC; 4773 4774 idev = ipv6_find_idev(dev); 4775 if (!idev) 4776 return -ENOBUFS; 4777 4778 if (!ipv6_allow_optimistic_dad(net, idev)) 4779 cfg.ifa_flags &= ~IFA_F_OPTIMISTIC; 4780 4781 if (cfg.ifa_flags & IFA_F_NODAD && 4782 cfg.ifa_flags & IFA_F_OPTIMISTIC) { 4783 NL_SET_ERR_MSG(extack, "IFA_F_NODAD and IFA_F_OPTIMISTIC are mutually exclusive"); 4784 return -EINVAL; 4785 } 4786 4787 ifa = ipv6_get_ifaddr(net, cfg.pfx, dev, 1); 4788 if (!ifa) { 4789 /* 4790 * It would be best to check for !NLM_F_CREATE here but 4791 * userspace already relies on not having to provide this. 4792 */ 4793 return inet6_addr_add(net, ifm->ifa_index, &cfg, extack); 4794 } 4795 4796 if (nlh->nlmsg_flags & NLM_F_EXCL || 4797 !(nlh->nlmsg_flags & NLM_F_REPLACE)) 4798 err = -EEXIST; 4799 else 4800 err = inet6_addr_modify(ifa, &cfg); 4801 4802 in6_ifa_put(ifa); 4803 4804 return err; 4805 } 4806 4807 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u32 flags, 4808 u8 scope, int ifindex) 4809 { 4810 struct ifaddrmsg *ifm; 4811 4812 ifm = nlmsg_data(nlh); 4813 ifm->ifa_family = AF_INET6; 4814 ifm->ifa_prefixlen = prefixlen; 4815 ifm->ifa_flags = flags; 4816 ifm->ifa_scope = scope; 4817 ifm->ifa_index = ifindex; 4818 } 4819 4820 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp, 4821 unsigned long tstamp, u32 preferred, u32 valid) 4822 { 4823 struct ifa_cacheinfo ci; 4824 4825 ci.cstamp = cstamp_delta(cstamp); 4826 ci.tstamp = cstamp_delta(tstamp); 4827 ci.ifa_prefered = preferred; 4828 ci.ifa_valid = valid; 4829 4830 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci); 4831 } 4832 4833 static inline int rt_scope(int ifa_scope) 4834 { 4835 if (ifa_scope & IFA_HOST) 4836 return RT_SCOPE_HOST; 4837 else if (ifa_scope & IFA_LINK) 4838 return RT_SCOPE_LINK; 4839 else if (ifa_scope & IFA_SITE) 4840 return RT_SCOPE_SITE; 4841 else 4842 return RT_SCOPE_UNIVERSE; 4843 } 4844 4845 static inline int inet6_ifaddr_msgsize(void) 4846 { 4847 return NLMSG_ALIGN(sizeof(struct ifaddrmsg)) 4848 + nla_total_size(16) /* IFA_LOCAL */ 4849 + nla_total_size(16) /* IFA_ADDRESS */ 4850 + nla_total_size(sizeof(struct ifa_cacheinfo)) 4851 + nla_total_size(4) /* IFA_FLAGS */ 4852 + nla_total_size(4) /* IFA_RT_PRIORITY */; 4853 } 4854 4855 enum addr_type_t { 4856 UNICAST_ADDR, 4857 MULTICAST_ADDR, 4858 ANYCAST_ADDR, 4859 }; 4860 4861 struct inet6_fill_args { 4862 u32 portid; 4863 u32 seq; 4864 int event; 4865 unsigned int flags; 4866 int netnsid; 4867 int ifindex; 4868 enum addr_type_t type; 4869 }; 4870 4871 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa, 4872 struct inet6_fill_args *args) 4873 { 4874 struct nlmsghdr *nlh; 4875 u32 preferred, valid; 4876 4877 nlh = nlmsg_put(skb, args->portid, args->seq, args->event, 4878 sizeof(struct ifaddrmsg), args->flags); 4879 if (!nlh) 4880 return -EMSGSIZE; 4881 4882 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope), 4883 ifa->idev->dev->ifindex); 4884 4885 if (args->netnsid >= 0 && 4886 nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid)) 4887 goto error; 4888 4889 if (!((ifa->flags&IFA_F_PERMANENT) && 4890 (ifa->prefered_lft == INFINITY_LIFE_TIME))) { 4891 preferred = ifa->prefered_lft; 4892 valid = ifa->valid_lft; 4893 if (preferred != INFINITY_LIFE_TIME) { 4894 long tval = (jiffies - ifa->tstamp)/HZ; 4895 if (preferred > tval) 4896 preferred -= tval; 4897 else 4898 preferred = 0; 4899 if (valid != INFINITY_LIFE_TIME) { 4900 if (valid > tval) 4901 valid -= tval; 4902 else 4903 valid = 0; 4904 } 4905 } 4906 } else { 4907 preferred = INFINITY_LIFE_TIME; 4908 valid = INFINITY_LIFE_TIME; 4909 } 4910 4911 if (!ipv6_addr_any(&ifa->peer_addr)) { 4912 if (nla_put_in6_addr(skb, IFA_LOCAL, &ifa->addr) < 0 || 4913 nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->peer_addr) < 0) 4914 goto error; 4915 } else 4916 if (nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->addr) < 0) 4917 goto error; 4918 4919 if (ifa->rt_priority && 4920 nla_put_u32(skb, IFA_RT_PRIORITY, ifa->rt_priority)) 4921 goto error; 4922 4923 if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) 4924 goto error; 4925 4926 if (nla_put_u32(skb, IFA_FLAGS, ifa->flags) < 0) 4927 goto error; 4928 4929 nlmsg_end(skb, nlh); 4930 return 0; 4931 4932 error: 4933 nlmsg_cancel(skb, nlh); 4934 return -EMSGSIZE; 4935 } 4936 4937 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca, 4938 struct inet6_fill_args *args) 4939 { 4940 struct nlmsghdr *nlh; 4941 u8 scope = RT_SCOPE_UNIVERSE; 4942 int ifindex = ifmca->idev->dev->ifindex; 4943 4944 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE) 4945 scope = RT_SCOPE_SITE; 4946 4947 nlh = nlmsg_put(skb, args->portid, args->seq, args->event, 4948 sizeof(struct ifaddrmsg), args->flags); 4949 if (!nlh) 4950 return -EMSGSIZE; 4951 4952 if (args->netnsid >= 0 && 4953 nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid)) 4954 return -EMSGSIZE; 4955 4956 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 4957 if (nla_put_in6_addr(skb, IFA_MULTICAST, &ifmca->mca_addr) < 0 || 4958 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp, 4959 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 4960 nlmsg_cancel(skb, nlh); 4961 return -EMSGSIZE; 4962 } 4963 4964 nlmsg_end(skb, nlh); 4965 return 0; 4966 } 4967 4968 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca, 4969 struct inet6_fill_args *args) 4970 { 4971 struct net_device *dev = fib6_info_nh_dev(ifaca->aca_rt); 4972 int ifindex = dev ? dev->ifindex : 1; 4973 struct nlmsghdr *nlh; 4974 u8 scope = RT_SCOPE_UNIVERSE; 4975 4976 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE) 4977 scope = RT_SCOPE_SITE; 4978 4979 nlh = nlmsg_put(skb, args->portid, args->seq, args->event, 4980 sizeof(struct ifaddrmsg), args->flags); 4981 if (!nlh) 4982 return -EMSGSIZE; 4983 4984 if (args->netnsid >= 0 && 4985 nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid)) 4986 return -EMSGSIZE; 4987 4988 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 4989 if (nla_put_in6_addr(skb, IFA_ANYCAST, &ifaca->aca_addr) < 0 || 4990 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp, 4991 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 4992 nlmsg_cancel(skb, nlh); 4993 return -EMSGSIZE; 4994 } 4995 4996 nlmsg_end(skb, nlh); 4997 return 0; 4998 } 4999 5000 /* called with rcu_read_lock() */ 5001 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb, 5002 struct netlink_callback *cb, int s_ip_idx, 5003 struct inet6_fill_args *fillargs) 5004 { 5005 struct ifmcaddr6 *ifmca; 5006 struct ifacaddr6 *ifaca; 5007 int ip_idx = 0; 5008 int err = 1; 5009 5010 read_lock_bh(&idev->lock); 5011 switch (fillargs->type) { 5012 case UNICAST_ADDR: { 5013 struct inet6_ifaddr *ifa; 5014 fillargs->event = RTM_NEWADDR; 5015 5016 /* unicast address incl. temp addr */ 5017 list_for_each_entry(ifa, &idev->addr_list, if_list) { 5018 if (ip_idx < s_ip_idx) 5019 goto next; 5020 err = inet6_fill_ifaddr(skb, ifa, fillargs); 5021 if (err < 0) 5022 break; 5023 nl_dump_check_consistent(cb, nlmsg_hdr(skb)); 5024 next: 5025 ip_idx++; 5026 } 5027 break; 5028 } 5029 case MULTICAST_ADDR: 5030 fillargs->event = RTM_GETMULTICAST; 5031 5032 /* multicast address */ 5033 for (ifmca = idev->mc_list; ifmca; 5034 ifmca = ifmca->next, ip_idx++) { 5035 if (ip_idx < s_ip_idx) 5036 continue; 5037 err = inet6_fill_ifmcaddr(skb, ifmca, fillargs); 5038 if (err < 0) 5039 break; 5040 } 5041 break; 5042 case ANYCAST_ADDR: 5043 fillargs->event = RTM_GETANYCAST; 5044 /* anycast address */ 5045 for (ifaca = idev->ac_list; ifaca; 5046 ifaca = ifaca->aca_next, ip_idx++) { 5047 if (ip_idx < s_ip_idx) 5048 continue; 5049 err = inet6_fill_ifacaddr(skb, ifaca, fillargs); 5050 if (err < 0) 5051 break; 5052 } 5053 break; 5054 default: 5055 break; 5056 } 5057 read_unlock_bh(&idev->lock); 5058 cb->args[2] = ip_idx; 5059 return err; 5060 } 5061 5062 static int inet6_valid_dump_ifaddr_req(const struct nlmsghdr *nlh, 5063 struct inet6_fill_args *fillargs, 5064 struct net **tgt_net, struct sock *sk, 5065 struct netlink_callback *cb) 5066 { 5067 struct netlink_ext_ack *extack = cb->extack; 5068 struct nlattr *tb[IFA_MAX+1]; 5069 struct ifaddrmsg *ifm; 5070 int err, i; 5071 5072 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) { 5073 NL_SET_ERR_MSG_MOD(extack, "Invalid header for address dump request"); 5074 return -EINVAL; 5075 } 5076 5077 ifm = nlmsg_data(nlh); 5078 if (ifm->ifa_prefixlen || ifm->ifa_flags || ifm->ifa_scope) { 5079 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for address dump request"); 5080 return -EINVAL; 5081 } 5082 5083 fillargs->ifindex = ifm->ifa_index; 5084 if (fillargs->ifindex) { 5085 cb->answer_flags |= NLM_F_DUMP_FILTERED; 5086 fillargs->flags |= NLM_F_DUMP_FILTERED; 5087 } 5088 5089 err = nlmsg_parse_strict(nlh, sizeof(*ifm), tb, IFA_MAX, 5090 ifa_ipv6_policy, extack); 5091 if (err < 0) 5092 return err; 5093 5094 for (i = 0; i <= IFA_MAX; ++i) { 5095 if (!tb[i]) 5096 continue; 5097 5098 if (i == IFA_TARGET_NETNSID) { 5099 struct net *net; 5100 5101 fillargs->netnsid = nla_get_s32(tb[i]); 5102 net = rtnl_get_net_ns_capable(sk, fillargs->netnsid); 5103 if (IS_ERR(net)) { 5104 fillargs->netnsid = -1; 5105 NL_SET_ERR_MSG_MOD(extack, "Invalid target network namespace id"); 5106 return PTR_ERR(net); 5107 } 5108 *tgt_net = net; 5109 } else { 5110 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in dump request"); 5111 return -EINVAL; 5112 } 5113 } 5114 5115 return 0; 5116 } 5117 5118 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb, 5119 enum addr_type_t type) 5120 { 5121 const struct nlmsghdr *nlh = cb->nlh; 5122 struct inet6_fill_args fillargs = { 5123 .portid = NETLINK_CB(cb->skb).portid, 5124 .seq = cb->nlh->nlmsg_seq, 5125 .flags = NLM_F_MULTI, 5126 .netnsid = -1, 5127 .type = type, 5128 }; 5129 struct net *net = sock_net(skb->sk); 5130 struct net *tgt_net = net; 5131 int idx, s_idx, s_ip_idx; 5132 int h, s_h; 5133 struct net_device *dev; 5134 struct inet6_dev *idev; 5135 struct hlist_head *head; 5136 int err = 0; 5137 5138 s_h = cb->args[0]; 5139 s_idx = idx = cb->args[1]; 5140 s_ip_idx = cb->args[2]; 5141 5142 if (cb->strict_check) { 5143 err = inet6_valid_dump_ifaddr_req(nlh, &fillargs, &tgt_net, 5144 skb->sk, cb); 5145 if (err < 0) 5146 goto put_tgt_net; 5147 5148 err = 0; 5149 if (fillargs.ifindex) { 5150 dev = __dev_get_by_index(tgt_net, fillargs.ifindex); 5151 if (!dev) { 5152 err = -ENODEV; 5153 goto put_tgt_net; 5154 } 5155 idev = __in6_dev_get(dev); 5156 if (idev) { 5157 err = in6_dump_addrs(idev, skb, cb, s_ip_idx, 5158 &fillargs); 5159 if (err > 0) 5160 err = 0; 5161 } 5162 goto put_tgt_net; 5163 } 5164 } 5165 5166 rcu_read_lock(); 5167 cb->seq = atomic_read(&tgt_net->ipv6.dev_addr_genid) ^ tgt_net->dev_base_seq; 5168 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 5169 idx = 0; 5170 head = &tgt_net->dev_index_head[h]; 5171 hlist_for_each_entry_rcu(dev, head, index_hlist) { 5172 if (idx < s_idx) 5173 goto cont; 5174 if (h > s_h || idx > s_idx) 5175 s_ip_idx = 0; 5176 idev = __in6_dev_get(dev); 5177 if (!idev) 5178 goto cont; 5179 5180 if (in6_dump_addrs(idev, skb, cb, s_ip_idx, 5181 &fillargs) < 0) 5182 goto done; 5183 cont: 5184 idx++; 5185 } 5186 } 5187 done: 5188 rcu_read_unlock(); 5189 cb->args[0] = h; 5190 cb->args[1] = idx; 5191 put_tgt_net: 5192 if (fillargs.netnsid >= 0) 5193 put_net(tgt_net); 5194 5195 return skb->len ? : err; 5196 } 5197 5198 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb) 5199 { 5200 enum addr_type_t type = UNICAST_ADDR; 5201 5202 return inet6_dump_addr(skb, cb, type); 5203 } 5204 5205 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb) 5206 { 5207 enum addr_type_t type = MULTICAST_ADDR; 5208 5209 return inet6_dump_addr(skb, cb, type); 5210 } 5211 5212 5213 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb) 5214 { 5215 enum addr_type_t type = ANYCAST_ADDR; 5216 5217 return inet6_dump_addr(skb, cb, type); 5218 } 5219 5220 static int inet6_rtm_valid_getaddr_req(struct sk_buff *skb, 5221 const struct nlmsghdr *nlh, 5222 struct nlattr **tb, 5223 struct netlink_ext_ack *extack) 5224 { 5225 struct ifaddrmsg *ifm; 5226 int i, err; 5227 5228 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) { 5229 NL_SET_ERR_MSG_MOD(extack, "Invalid header for get address request"); 5230 return -EINVAL; 5231 } 5232 5233 ifm = nlmsg_data(nlh); 5234 if (ifm->ifa_prefixlen || ifm->ifa_flags || ifm->ifa_scope) { 5235 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for get address request"); 5236 return -EINVAL; 5237 } 5238 5239 if (!netlink_strict_get_check(skb)) 5240 return nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, 5241 ifa_ipv6_policy, extack); 5242 5243 err = nlmsg_parse_strict(nlh, sizeof(*ifm), tb, IFA_MAX, 5244 ifa_ipv6_policy, extack); 5245 if (err) 5246 return err; 5247 5248 for (i = 0; i <= IFA_MAX; i++) { 5249 if (!tb[i]) 5250 continue; 5251 5252 switch (i) { 5253 case IFA_TARGET_NETNSID: 5254 case IFA_ADDRESS: 5255 case IFA_LOCAL: 5256 break; 5257 default: 5258 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in get address request"); 5259 return -EINVAL; 5260 } 5261 } 5262 5263 return 0; 5264 } 5265 5266 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh, 5267 struct netlink_ext_ack *extack) 5268 { 5269 struct net *net = sock_net(in_skb->sk); 5270 struct inet6_fill_args fillargs = { 5271 .portid = NETLINK_CB(in_skb).portid, 5272 .seq = nlh->nlmsg_seq, 5273 .event = RTM_NEWADDR, 5274 .flags = 0, 5275 .netnsid = -1, 5276 }; 5277 struct net *tgt_net = net; 5278 struct ifaddrmsg *ifm; 5279 struct nlattr *tb[IFA_MAX+1]; 5280 struct in6_addr *addr = NULL, *peer; 5281 struct net_device *dev = NULL; 5282 struct inet6_ifaddr *ifa; 5283 struct sk_buff *skb; 5284 int err; 5285 5286 err = inet6_rtm_valid_getaddr_req(in_skb, nlh, tb, extack); 5287 if (err < 0) 5288 return err; 5289 5290 if (tb[IFA_TARGET_NETNSID]) { 5291 fillargs.netnsid = nla_get_s32(tb[IFA_TARGET_NETNSID]); 5292 5293 tgt_net = rtnl_get_net_ns_capable(NETLINK_CB(in_skb).sk, 5294 fillargs.netnsid); 5295 if (IS_ERR(tgt_net)) 5296 return PTR_ERR(tgt_net); 5297 } 5298 5299 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer); 5300 if (!addr) 5301 return -EINVAL; 5302 5303 ifm = nlmsg_data(nlh); 5304 if (ifm->ifa_index) 5305 dev = dev_get_by_index(tgt_net, ifm->ifa_index); 5306 5307 ifa = ipv6_get_ifaddr(tgt_net, addr, dev, 1); 5308 if (!ifa) { 5309 err = -EADDRNOTAVAIL; 5310 goto errout; 5311 } 5312 5313 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL); 5314 if (!skb) { 5315 err = -ENOBUFS; 5316 goto errout_ifa; 5317 } 5318 5319 err = inet6_fill_ifaddr(skb, ifa, &fillargs); 5320 if (err < 0) { 5321 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 5322 WARN_ON(err == -EMSGSIZE); 5323 kfree_skb(skb); 5324 goto errout_ifa; 5325 } 5326 err = rtnl_unicast(skb, tgt_net, NETLINK_CB(in_skb).portid); 5327 errout_ifa: 5328 in6_ifa_put(ifa); 5329 errout: 5330 if (dev) 5331 dev_put(dev); 5332 if (fillargs.netnsid >= 0) 5333 put_net(tgt_net); 5334 5335 return err; 5336 } 5337 5338 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa) 5339 { 5340 struct sk_buff *skb; 5341 struct net *net = dev_net(ifa->idev->dev); 5342 struct inet6_fill_args fillargs = { 5343 .portid = 0, 5344 .seq = 0, 5345 .event = event, 5346 .flags = 0, 5347 .netnsid = -1, 5348 }; 5349 int err = -ENOBUFS; 5350 5351 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC); 5352 if (!skb) 5353 goto errout; 5354 5355 err = inet6_fill_ifaddr(skb, ifa, &fillargs); 5356 if (err < 0) { 5357 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 5358 WARN_ON(err == -EMSGSIZE); 5359 kfree_skb(skb); 5360 goto errout; 5361 } 5362 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC); 5363 return; 5364 errout: 5365 if (err < 0) 5366 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err); 5367 } 5368 5369 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf, 5370 __s32 *array, int bytes) 5371 { 5372 BUG_ON(bytes < (DEVCONF_MAX * 4)); 5373 5374 memset(array, 0, bytes); 5375 array[DEVCONF_FORWARDING] = cnf->forwarding; 5376 array[DEVCONF_HOPLIMIT] = cnf->hop_limit; 5377 array[DEVCONF_MTU6] = cnf->mtu6; 5378 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra; 5379 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects; 5380 array[DEVCONF_AUTOCONF] = cnf->autoconf; 5381 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits; 5382 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits; 5383 array[DEVCONF_RTR_SOLICIT_INTERVAL] = 5384 jiffies_to_msecs(cnf->rtr_solicit_interval); 5385 array[DEVCONF_RTR_SOLICIT_MAX_INTERVAL] = 5386 jiffies_to_msecs(cnf->rtr_solicit_max_interval); 5387 array[DEVCONF_RTR_SOLICIT_DELAY] = 5388 jiffies_to_msecs(cnf->rtr_solicit_delay); 5389 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version; 5390 array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] = 5391 jiffies_to_msecs(cnf->mldv1_unsolicited_report_interval); 5392 array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] = 5393 jiffies_to_msecs(cnf->mldv2_unsolicited_report_interval); 5394 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr; 5395 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft; 5396 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft; 5397 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry; 5398 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor; 5399 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses; 5400 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr; 5401 array[DEVCONF_ACCEPT_RA_MIN_HOP_LIMIT] = cnf->accept_ra_min_hop_limit; 5402 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo; 5403 #ifdef CONFIG_IPV6_ROUTER_PREF 5404 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref; 5405 array[DEVCONF_RTR_PROBE_INTERVAL] = 5406 jiffies_to_msecs(cnf->rtr_probe_interval); 5407 #ifdef CONFIG_IPV6_ROUTE_INFO 5408 array[DEVCONF_ACCEPT_RA_RT_INFO_MIN_PLEN] = cnf->accept_ra_rt_info_min_plen; 5409 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen; 5410 #endif 5411 #endif 5412 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp; 5413 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route; 5414 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 5415 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad; 5416 array[DEVCONF_USE_OPTIMISTIC] = cnf->use_optimistic; 5417 #endif 5418 #ifdef CONFIG_IPV6_MROUTE 5419 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding; 5420 #endif 5421 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6; 5422 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad; 5423 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao; 5424 array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify; 5425 array[DEVCONF_SUPPRESS_FRAG_NDISC] = cnf->suppress_frag_ndisc; 5426 array[DEVCONF_ACCEPT_RA_FROM_LOCAL] = cnf->accept_ra_from_local; 5427 array[DEVCONF_ACCEPT_RA_MTU] = cnf->accept_ra_mtu; 5428 array[DEVCONF_IGNORE_ROUTES_WITH_LINKDOWN] = cnf->ignore_routes_with_linkdown; 5429 /* we omit DEVCONF_STABLE_SECRET for now */ 5430 array[DEVCONF_USE_OIF_ADDRS_ONLY] = cnf->use_oif_addrs_only; 5431 array[DEVCONF_DROP_UNICAST_IN_L2_MULTICAST] = cnf->drop_unicast_in_l2_multicast; 5432 array[DEVCONF_DROP_UNSOLICITED_NA] = cnf->drop_unsolicited_na; 5433 array[DEVCONF_KEEP_ADDR_ON_DOWN] = cnf->keep_addr_on_down; 5434 array[DEVCONF_SEG6_ENABLED] = cnf->seg6_enabled; 5435 #ifdef CONFIG_IPV6_SEG6_HMAC 5436 array[DEVCONF_SEG6_REQUIRE_HMAC] = cnf->seg6_require_hmac; 5437 #endif 5438 array[DEVCONF_ENHANCED_DAD] = cnf->enhanced_dad; 5439 array[DEVCONF_ADDR_GEN_MODE] = cnf->addr_gen_mode; 5440 array[DEVCONF_DISABLE_POLICY] = cnf->disable_policy; 5441 array[DEVCONF_NDISC_TCLASS] = cnf->ndisc_tclass; 5442 } 5443 5444 static inline size_t inet6_ifla6_size(void) 5445 { 5446 return nla_total_size(4) /* IFLA_INET6_FLAGS */ 5447 + nla_total_size(sizeof(struct ifla_cacheinfo)) 5448 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */ 5449 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */ 5450 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */ 5451 + nla_total_size(sizeof(struct in6_addr)) /* IFLA_INET6_TOKEN */ 5452 + nla_total_size(1) /* IFLA_INET6_ADDR_GEN_MODE */ 5453 + 0; 5454 } 5455 5456 static inline size_t inet6_if_nlmsg_size(void) 5457 { 5458 return NLMSG_ALIGN(sizeof(struct ifinfomsg)) 5459 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */ 5460 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */ 5461 + nla_total_size(4) /* IFLA_MTU */ 5462 + nla_total_size(4) /* IFLA_LINK */ 5463 + nla_total_size(1) /* IFLA_OPERSTATE */ 5464 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */ 5465 } 5466 5467 static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib, 5468 int bytes) 5469 { 5470 int i; 5471 int pad = bytes - sizeof(u64) * ICMP6_MIB_MAX; 5472 BUG_ON(pad < 0); 5473 5474 /* Use put_unaligned() because stats may not be aligned for u64. */ 5475 put_unaligned(ICMP6_MIB_MAX, &stats[0]); 5476 for (i = 1; i < ICMP6_MIB_MAX; i++) 5477 put_unaligned(atomic_long_read(&mib[i]), &stats[i]); 5478 5479 memset(&stats[ICMP6_MIB_MAX], 0, pad); 5480 } 5481 5482 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu *mib, 5483 int bytes, size_t syncpoff) 5484 { 5485 int i, c; 5486 u64 buff[IPSTATS_MIB_MAX]; 5487 int pad = bytes - sizeof(u64) * IPSTATS_MIB_MAX; 5488 5489 BUG_ON(pad < 0); 5490 5491 memset(buff, 0, sizeof(buff)); 5492 buff[0] = IPSTATS_MIB_MAX; 5493 5494 for_each_possible_cpu(c) { 5495 for (i = 1; i < IPSTATS_MIB_MAX; i++) 5496 buff[i] += snmp_get_cpu_field64(mib, c, i, syncpoff); 5497 } 5498 5499 memcpy(stats, buff, IPSTATS_MIB_MAX * sizeof(u64)); 5500 memset(&stats[IPSTATS_MIB_MAX], 0, pad); 5501 } 5502 5503 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype, 5504 int bytes) 5505 { 5506 switch (attrtype) { 5507 case IFLA_INET6_STATS: 5508 __snmp6_fill_stats64(stats, idev->stats.ipv6, bytes, 5509 offsetof(struct ipstats_mib, syncp)); 5510 break; 5511 case IFLA_INET6_ICMP6STATS: 5512 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, bytes); 5513 break; 5514 } 5515 } 5516 5517 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev, 5518 u32 ext_filter_mask) 5519 { 5520 struct nlattr *nla; 5521 struct ifla_cacheinfo ci; 5522 5523 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags)) 5524 goto nla_put_failure; 5525 ci.max_reasm_len = IPV6_MAXPLEN; 5526 ci.tstamp = cstamp_delta(idev->tstamp); 5527 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time); 5528 ci.retrans_time = jiffies_to_msecs(NEIGH_VAR(idev->nd_parms, RETRANS_TIME)); 5529 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci)) 5530 goto nla_put_failure; 5531 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32)); 5532 if (!nla) 5533 goto nla_put_failure; 5534 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla)); 5535 5536 /* XXX - MC not implemented */ 5537 5538 if (ext_filter_mask & RTEXT_FILTER_SKIP_STATS) 5539 return 0; 5540 5541 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64)); 5542 if (!nla) 5543 goto nla_put_failure; 5544 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla)); 5545 5546 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64)); 5547 if (!nla) 5548 goto nla_put_failure; 5549 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla)); 5550 5551 nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr)); 5552 if (!nla) 5553 goto nla_put_failure; 5554 5555 if (nla_put_u8(skb, IFLA_INET6_ADDR_GEN_MODE, idev->cnf.addr_gen_mode)) 5556 goto nla_put_failure; 5557 5558 read_lock_bh(&idev->lock); 5559 memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla)); 5560 read_unlock_bh(&idev->lock); 5561 5562 return 0; 5563 5564 nla_put_failure: 5565 return -EMSGSIZE; 5566 } 5567 5568 static size_t inet6_get_link_af_size(const struct net_device *dev, 5569 u32 ext_filter_mask) 5570 { 5571 if (!__in6_dev_get(dev)) 5572 return 0; 5573 5574 return inet6_ifla6_size(); 5575 } 5576 5577 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev, 5578 u32 ext_filter_mask) 5579 { 5580 struct inet6_dev *idev = __in6_dev_get(dev); 5581 5582 if (!idev) 5583 return -ENODATA; 5584 5585 if (inet6_fill_ifla6_attrs(skb, idev, ext_filter_mask) < 0) 5586 return -EMSGSIZE; 5587 5588 return 0; 5589 } 5590 5591 static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token) 5592 { 5593 struct inet6_ifaddr *ifp; 5594 struct net_device *dev = idev->dev; 5595 bool clear_token, update_rs = false; 5596 struct in6_addr ll_addr; 5597 5598 ASSERT_RTNL(); 5599 5600 if (!token) 5601 return -EINVAL; 5602 if (dev->flags & (IFF_LOOPBACK | IFF_NOARP)) 5603 return -EINVAL; 5604 if (!ipv6_accept_ra(idev)) 5605 return -EINVAL; 5606 if (idev->cnf.rtr_solicits == 0) 5607 return -EINVAL; 5608 5609 write_lock_bh(&idev->lock); 5610 5611 BUILD_BUG_ON(sizeof(token->s6_addr) != 16); 5612 memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8); 5613 5614 write_unlock_bh(&idev->lock); 5615 5616 clear_token = ipv6_addr_any(token); 5617 if (clear_token) 5618 goto update_lft; 5619 5620 if (!idev->dead && (idev->if_flags & IF_READY) && 5621 !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE | 5622 IFA_F_OPTIMISTIC)) { 5623 /* If we're not ready, then normal ifup will take care 5624 * of this. Otherwise, we need to request our rs here. 5625 */ 5626 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters); 5627 update_rs = true; 5628 } 5629 5630 update_lft: 5631 write_lock_bh(&idev->lock); 5632 5633 if (update_rs) { 5634 idev->if_flags |= IF_RS_SENT; 5635 idev->rs_interval = rfc3315_s14_backoff_init( 5636 idev->cnf.rtr_solicit_interval); 5637 idev->rs_probes = 1; 5638 addrconf_mod_rs_timer(idev, idev->rs_interval); 5639 } 5640 5641 /* Well, that's kinda nasty ... */ 5642 list_for_each_entry(ifp, &idev->addr_list, if_list) { 5643 spin_lock(&ifp->lock); 5644 if (ifp->tokenized) { 5645 ifp->valid_lft = 0; 5646 ifp->prefered_lft = 0; 5647 } 5648 spin_unlock(&ifp->lock); 5649 } 5650 5651 write_unlock_bh(&idev->lock); 5652 inet6_ifinfo_notify(RTM_NEWLINK, idev); 5653 addrconf_verify_rtnl(); 5654 return 0; 5655 } 5656 5657 static const struct nla_policy inet6_af_policy[IFLA_INET6_MAX + 1] = { 5658 [IFLA_INET6_ADDR_GEN_MODE] = { .type = NLA_U8 }, 5659 [IFLA_INET6_TOKEN] = { .len = sizeof(struct in6_addr) }, 5660 }; 5661 5662 static int inet6_validate_link_af(const struct net_device *dev, 5663 const struct nlattr *nla) 5664 { 5665 struct nlattr *tb[IFLA_INET6_MAX + 1]; 5666 5667 if (dev && !__in6_dev_get(dev)) 5668 return -EAFNOSUPPORT; 5669 5670 return nla_parse_nested(tb, IFLA_INET6_MAX, nla, inet6_af_policy, 5671 NULL); 5672 } 5673 5674 static int check_addr_gen_mode(int mode) 5675 { 5676 if (mode != IN6_ADDR_GEN_MODE_EUI64 && 5677 mode != IN6_ADDR_GEN_MODE_NONE && 5678 mode != IN6_ADDR_GEN_MODE_STABLE_PRIVACY && 5679 mode != IN6_ADDR_GEN_MODE_RANDOM) 5680 return -EINVAL; 5681 return 1; 5682 } 5683 5684 static int check_stable_privacy(struct inet6_dev *idev, struct net *net, 5685 int mode) 5686 { 5687 if (mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY && 5688 !idev->cnf.stable_secret.initialized && 5689 !net->ipv6.devconf_dflt->stable_secret.initialized) 5690 return -EINVAL; 5691 return 1; 5692 } 5693 5694 static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla) 5695 { 5696 int err = -EINVAL; 5697 struct inet6_dev *idev = __in6_dev_get(dev); 5698 struct nlattr *tb[IFLA_INET6_MAX + 1]; 5699 5700 if (!idev) 5701 return -EAFNOSUPPORT; 5702 5703 if (nla_parse_nested(tb, IFLA_INET6_MAX, nla, NULL, NULL) < 0) 5704 BUG(); 5705 5706 if (tb[IFLA_INET6_TOKEN]) { 5707 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN])); 5708 if (err) 5709 return err; 5710 } 5711 5712 if (tb[IFLA_INET6_ADDR_GEN_MODE]) { 5713 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]); 5714 5715 if (check_addr_gen_mode(mode) < 0 || 5716 check_stable_privacy(idev, dev_net(dev), mode) < 0) 5717 return -EINVAL; 5718 5719 idev->cnf.addr_gen_mode = mode; 5720 err = 0; 5721 } 5722 5723 return err; 5724 } 5725 5726 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev, 5727 u32 portid, u32 seq, int event, unsigned int flags) 5728 { 5729 struct net_device *dev = idev->dev; 5730 struct ifinfomsg *hdr; 5731 struct nlmsghdr *nlh; 5732 void *protoinfo; 5733 5734 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags); 5735 if (!nlh) 5736 return -EMSGSIZE; 5737 5738 hdr = nlmsg_data(nlh); 5739 hdr->ifi_family = AF_INET6; 5740 hdr->__ifi_pad = 0; 5741 hdr->ifi_type = dev->type; 5742 hdr->ifi_index = dev->ifindex; 5743 hdr->ifi_flags = dev_get_flags(dev); 5744 hdr->ifi_change = 0; 5745 5746 if (nla_put_string(skb, IFLA_IFNAME, dev->name) || 5747 (dev->addr_len && 5748 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) || 5749 nla_put_u32(skb, IFLA_MTU, dev->mtu) || 5750 (dev->ifindex != dev_get_iflink(dev) && 5751 nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))) || 5752 nla_put_u8(skb, IFLA_OPERSTATE, 5753 netif_running(dev) ? dev->operstate : IF_OPER_DOWN)) 5754 goto nla_put_failure; 5755 protoinfo = nla_nest_start(skb, IFLA_PROTINFO); 5756 if (!protoinfo) 5757 goto nla_put_failure; 5758 5759 if (inet6_fill_ifla6_attrs(skb, idev, 0) < 0) 5760 goto nla_put_failure; 5761 5762 nla_nest_end(skb, protoinfo); 5763 nlmsg_end(skb, nlh); 5764 return 0; 5765 5766 nla_put_failure: 5767 nlmsg_cancel(skb, nlh); 5768 return -EMSGSIZE; 5769 } 5770 5771 static int inet6_valid_dump_ifinfo(const struct nlmsghdr *nlh, 5772 struct netlink_ext_ack *extack) 5773 { 5774 struct ifinfomsg *ifm; 5775 5776 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) { 5777 NL_SET_ERR_MSG_MOD(extack, "Invalid header for link dump request"); 5778 return -EINVAL; 5779 } 5780 5781 if (nlmsg_attrlen(nlh, sizeof(*ifm))) { 5782 NL_SET_ERR_MSG_MOD(extack, "Invalid data after header"); 5783 return -EINVAL; 5784 } 5785 5786 ifm = nlmsg_data(nlh); 5787 if (ifm->__ifi_pad || ifm->ifi_type || ifm->ifi_flags || 5788 ifm->ifi_change || ifm->ifi_index) { 5789 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for dump request"); 5790 return -EINVAL; 5791 } 5792 5793 return 0; 5794 } 5795 5796 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb) 5797 { 5798 struct net *net = sock_net(skb->sk); 5799 int h, s_h; 5800 int idx = 0, s_idx; 5801 struct net_device *dev; 5802 struct inet6_dev *idev; 5803 struct hlist_head *head; 5804 5805 /* only requests using strict checking can pass data to 5806 * influence the dump 5807 */ 5808 if (cb->strict_check) { 5809 int err = inet6_valid_dump_ifinfo(cb->nlh, cb->extack); 5810 5811 if (err < 0) 5812 return err; 5813 } 5814 5815 s_h = cb->args[0]; 5816 s_idx = cb->args[1]; 5817 5818 rcu_read_lock(); 5819 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 5820 idx = 0; 5821 head = &net->dev_index_head[h]; 5822 hlist_for_each_entry_rcu(dev, head, index_hlist) { 5823 if (idx < s_idx) 5824 goto cont; 5825 idev = __in6_dev_get(dev); 5826 if (!idev) 5827 goto cont; 5828 if (inet6_fill_ifinfo(skb, idev, 5829 NETLINK_CB(cb->skb).portid, 5830 cb->nlh->nlmsg_seq, 5831 RTM_NEWLINK, NLM_F_MULTI) < 0) 5832 goto out; 5833 cont: 5834 idx++; 5835 } 5836 } 5837 out: 5838 rcu_read_unlock(); 5839 cb->args[1] = idx; 5840 cb->args[0] = h; 5841 5842 return skb->len; 5843 } 5844 5845 void inet6_ifinfo_notify(int event, struct inet6_dev *idev) 5846 { 5847 struct sk_buff *skb; 5848 struct net *net = dev_net(idev->dev); 5849 int err = -ENOBUFS; 5850 5851 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC); 5852 if (!skb) 5853 goto errout; 5854 5855 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0); 5856 if (err < 0) { 5857 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */ 5858 WARN_ON(err == -EMSGSIZE); 5859 kfree_skb(skb); 5860 goto errout; 5861 } 5862 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC); 5863 return; 5864 errout: 5865 if (err < 0) 5866 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err); 5867 } 5868 5869 static inline size_t inet6_prefix_nlmsg_size(void) 5870 { 5871 return NLMSG_ALIGN(sizeof(struct prefixmsg)) 5872 + nla_total_size(sizeof(struct in6_addr)) 5873 + nla_total_size(sizeof(struct prefix_cacheinfo)); 5874 } 5875 5876 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev, 5877 struct prefix_info *pinfo, u32 portid, u32 seq, 5878 int event, unsigned int flags) 5879 { 5880 struct prefixmsg *pmsg; 5881 struct nlmsghdr *nlh; 5882 struct prefix_cacheinfo ci; 5883 5884 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags); 5885 if (!nlh) 5886 return -EMSGSIZE; 5887 5888 pmsg = nlmsg_data(nlh); 5889 pmsg->prefix_family = AF_INET6; 5890 pmsg->prefix_pad1 = 0; 5891 pmsg->prefix_pad2 = 0; 5892 pmsg->prefix_ifindex = idev->dev->ifindex; 5893 pmsg->prefix_len = pinfo->prefix_len; 5894 pmsg->prefix_type = pinfo->type; 5895 pmsg->prefix_pad3 = 0; 5896 pmsg->prefix_flags = 0; 5897 if (pinfo->onlink) 5898 pmsg->prefix_flags |= IF_PREFIX_ONLINK; 5899 if (pinfo->autoconf) 5900 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF; 5901 5902 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix)) 5903 goto nla_put_failure; 5904 ci.preferred_time = ntohl(pinfo->prefered); 5905 ci.valid_time = ntohl(pinfo->valid); 5906 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci)) 5907 goto nla_put_failure; 5908 nlmsg_end(skb, nlh); 5909 return 0; 5910 5911 nla_put_failure: 5912 nlmsg_cancel(skb, nlh); 5913 return -EMSGSIZE; 5914 } 5915 5916 static void inet6_prefix_notify(int event, struct inet6_dev *idev, 5917 struct prefix_info *pinfo) 5918 { 5919 struct sk_buff *skb; 5920 struct net *net = dev_net(idev->dev); 5921 int err = -ENOBUFS; 5922 5923 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC); 5924 if (!skb) 5925 goto errout; 5926 5927 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0); 5928 if (err < 0) { 5929 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */ 5930 WARN_ON(err == -EMSGSIZE); 5931 kfree_skb(skb); 5932 goto errout; 5933 } 5934 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC); 5935 return; 5936 errout: 5937 if (err < 0) 5938 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err); 5939 } 5940 5941 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 5942 { 5943 struct net *net = dev_net(ifp->idev->dev); 5944 5945 if (event) 5946 ASSERT_RTNL(); 5947 5948 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp); 5949 5950 switch (event) { 5951 case RTM_NEWADDR: 5952 /* 5953 * If the address was optimistic 5954 * we inserted the route at the start of 5955 * our DAD process, so we don't need 5956 * to do it again 5957 */ 5958 if (!rcu_access_pointer(ifp->rt->fib6_node)) 5959 ip6_ins_rt(net, ifp->rt); 5960 if (ifp->idev->cnf.forwarding) 5961 addrconf_join_anycast(ifp); 5962 if (!ipv6_addr_any(&ifp->peer_addr)) 5963 addrconf_prefix_route(&ifp->peer_addr, 128, 0, 5964 ifp->idev->dev, 0, 0, 5965 GFP_ATOMIC); 5966 break; 5967 case RTM_DELADDR: 5968 if (ifp->idev->cnf.forwarding) 5969 addrconf_leave_anycast(ifp); 5970 addrconf_leave_solict(ifp->idev, &ifp->addr); 5971 if (!ipv6_addr_any(&ifp->peer_addr)) { 5972 struct fib6_info *rt; 5973 5974 rt = addrconf_get_prefix_route(&ifp->peer_addr, 128, 5975 ifp->idev->dev, 0, 0); 5976 if (rt) 5977 ip6_del_rt(net, rt); 5978 } 5979 if (ifp->rt) { 5980 ip6_del_rt(net, ifp->rt); 5981 ifp->rt = NULL; 5982 } 5983 rt_genid_bump_ipv6(net); 5984 break; 5985 } 5986 atomic_inc(&net->ipv6.dev_addr_genid); 5987 } 5988 5989 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 5990 { 5991 rcu_read_lock_bh(); 5992 if (likely(ifp->idev->dead == 0)) 5993 __ipv6_ifa_notify(event, ifp); 5994 rcu_read_unlock_bh(); 5995 } 5996 5997 #ifdef CONFIG_SYSCTL 5998 5999 static 6000 int addrconf_sysctl_forward(struct ctl_table *ctl, int write, 6001 void __user *buffer, size_t *lenp, loff_t *ppos) 6002 { 6003 int *valp = ctl->data; 6004 int val = *valp; 6005 loff_t pos = *ppos; 6006 struct ctl_table lctl; 6007 int ret; 6008 6009 /* 6010 * ctl->data points to idev->cnf.forwarding, we should 6011 * not modify it until we get the rtnl lock. 6012 */ 6013 lctl = *ctl; 6014 lctl.data = &val; 6015 6016 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 6017 6018 if (write) 6019 ret = addrconf_fixup_forwarding(ctl, valp, val); 6020 if (ret) 6021 *ppos = pos; 6022 return ret; 6023 } 6024 6025 static 6026 int addrconf_sysctl_mtu(struct ctl_table *ctl, int write, 6027 void __user *buffer, size_t *lenp, loff_t *ppos) 6028 { 6029 struct inet6_dev *idev = ctl->extra1; 6030 int min_mtu = IPV6_MIN_MTU; 6031 struct ctl_table lctl; 6032 6033 lctl = *ctl; 6034 lctl.extra1 = &min_mtu; 6035 lctl.extra2 = idev ? &idev->dev->mtu : NULL; 6036 6037 return proc_dointvec_minmax(&lctl, write, buffer, lenp, ppos); 6038 } 6039 6040 static void dev_disable_change(struct inet6_dev *idev) 6041 { 6042 struct netdev_notifier_info info; 6043 6044 if (!idev || !idev->dev) 6045 return; 6046 6047 netdev_notifier_info_init(&info, idev->dev); 6048 if (idev->cnf.disable_ipv6) 6049 addrconf_notify(NULL, NETDEV_DOWN, &info); 6050 else 6051 addrconf_notify(NULL, NETDEV_UP, &info); 6052 } 6053 6054 static void addrconf_disable_change(struct net *net, __s32 newf) 6055 { 6056 struct net_device *dev; 6057 struct inet6_dev *idev; 6058 6059 for_each_netdev(net, dev) { 6060 idev = __in6_dev_get(dev); 6061 if (idev) { 6062 int changed = (!idev->cnf.disable_ipv6) ^ (!newf); 6063 idev->cnf.disable_ipv6 = newf; 6064 if (changed) 6065 dev_disable_change(idev); 6066 } 6067 } 6068 } 6069 6070 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf) 6071 { 6072 struct net *net; 6073 int old; 6074 6075 if (!rtnl_trylock()) 6076 return restart_syscall(); 6077 6078 net = (struct net *)table->extra2; 6079 old = *p; 6080 *p = newf; 6081 6082 if (p == &net->ipv6.devconf_dflt->disable_ipv6) { 6083 rtnl_unlock(); 6084 return 0; 6085 } 6086 6087 if (p == &net->ipv6.devconf_all->disable_ipv6) { 6088 net->ipv6.devconf_dflt->disable_ipv6 = newf; 6089 addrconf_disable_change(net, newf); 6090 } else if ((!newf) ^ (!old)) 6091 dev_disable_change((struct inet6_dev *)table->extra1); 6092 6093 rtnl_unlock(); 6094 return 0; 6095 } 6096 6097 static 6098 int addrconf_sysctl_disable(struct ctl_table *ctl, int write, 6099 void __user *buffer, size_t *lenp, loff_t *ppos) 6100 { 6101 int *valp = ctl->data; 6102 int val = *valp; 6103 loff_t pos = *ppos; 6104 struct ctl_table lctl; 6105 int ret; 6106 6107 /* 6108 * ctl->data points to idev->cnf.disable_ipv6, we should 6109 * not modify it until we get the rtnl lock. 6110 */ 6111 lctl = *ctl; 6112 lctl.data = &val; 6113 6114 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 6115 6116 if (write) 6117 ret = addrconf_disable_ipv6(ctl, valp, val); 6118 if (ret) 6119 *ppos = pos; 6120 return ret; 6121 } 6122 6123 static 6124 int addrconf_sysctl_proxy_ndp(struct ctl_table *ctl, int write, 6125 void __user *buffer, size_t *lenp, loff_t *ppos) 6126 { 6127 int *valp = ctl->data; 6128 int ret; 6129 int old, new; 6130 6131 old = *valp; 6132 ret = proc_dointvec(ctl, write, buffer, lenp, ppos); 6133 new = *valp; 6134 6135 if (write && old != new) { 6136 struct net *net = ctl->extra2; 6137 6138 if (!rtnl_trylock()) 6139 return restart_syscall(); 6140 6141 if (valp == &net->ipv6.devconf_dflt->proxy_ndp) 6142 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 6143 NETCONFA_PROXY_NEIGH, 6144 NETCONFA_IFINDEX_DEFAULT, 6145 net->ipv6.devconf_dflt); 6146 else if (valp == &net->ipv6.devconf_all->proxy_ndp) 6147 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 6148 NETCONFA_PROXY_NEIGH, 6149 NETCONFA_IFINDEX_ALL, 6150 net->ipv6.devconf_all); 6151 else { 6152 struct inet6_dev *idev = ctl->extra1; 6153 6154 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 6155 NETCONFA_PROXY_NEIGH, 6156 idev->dev->ifindex, 6157 &idev->cnf); 6158 } 6159 rtnl_unlock(); 6160 } 6161 6162 return ret; 6163 } 6164 6165 static int addrconf_sysctl_addr_gen_mode(struct ctl_table *ctl, int write, 6166 void __user *buffer, size_t *lenp, 6167 loff_t *ppos) 6168 { 6169 int ret = 0; 6170 u32 new_val; 6171 struct inet6_dev *idev = (struct inet6_dev *)ctl->extra1; 6172 struct net *net = (struct net *)ctl->extra2; 6173 struct ctl_table tmp = { 6174 .data = &new_val, 6175 .maxlen = sizeof(new_val), 6176 .mode = ctl->mode, 6177 }; 6178 6179 if (!rtnl_trylock()) 6180 return restart_syscall(); 6181 6182 new_val = *((u32 *)ctl->data); 6183 6184 ret = proc_douintvec(&tmp, write, buffer, lenp, ppos); 6185 if (ret != 0) 6186 goto out; 6187 6188 if (write) { 6189 if (check_addr_gen_mode(new_val) < 0) { 6190 ret = -EINVAL; 6191 goto out; 6192 } 6193 6194 if (idev) { 6195 if (check_stable_privacy(idev, net, new_val) < 0) { 6196 ret = -EINVAL; 6197 goto out; 6198 } 6199 6200 if (idev->cnf.addr_gen_mode != new_val) { 6201 idev->cnf.addr_gen_mode = new_val; 6202 addrconf_dev_config(idev->dev); 6203 } 6204 } else if (&net->ipv6.devconf_all->addr_gen_mode == ctl->data) { 6205 struct net_device *dev; 6206 6207 net->ipv6.devconf_dflt->addr_gen_mode = new_val; 6208 for_each_netdev(net, dev) { 6209 idev = __in6_dev_get(dev); 6210 if (idev && 6211 idev->cnf.addr_gen_mode != new_val) { 6212 idev->cnf.addr_gen_mode = new_val; 6213 addrconf_dev_config(idev->dev); 6214 } 6215 } 6216 } 6217 6218 *((u32 *)ctl->data) = new_val; 6219 } 6220 6221 out: 6222 rtnl_unlock(); 6223 6224 return ret; 6225 } 6226 6227 static int addrconf_sysctl_stable_secret(struct ctl_table *ctl, int write, 6228 void __user *buffer, size_t *lenp, 6229 loff_t *ppos) 6230 { 6231 int err; 6232 struct in6_addr addr; 6233 char str[IPV6_MAX_STRLEN]; 6234 struct ctl_table lctl = *ctl; 6235 struct net *net = ctl->extra2; 6236 struct ipv6_stable_secret *secret = ctl->data; 6237 6238 if (&net->ipv6.devconf_all->stable_secret == ctl->data) 6239 return -EIO; 6240 6241 lctl.maxlen = IPV6_MAX_STRLEN; 6242 lctl.data = str; 6243 6244 if (!rtnl_trylock()) 6245 return restart_syscall(); 6246 6247 if (!write && !secret->initialized) { 6248 err = -EIO; 6249 goto out; 6250 } 6251 6252 err = snprintf(str, sizeof(str), "%pI6", &secret->secret); 6253 if (err >= sizeof(str)) { 6254 err = -EIO; 6255 goto out; 6256 } 6257 6258 err = proc_dostring(&lctl, write, buffer, lenp, ppos); 6259 if (err || !write) 6260 goto out; 6261 6262 if (in6_pton(str, -1, addr.in6_u.u6_addr8, -1, NULL) != 1) { 6263 err = -EIO; 6264 goto out; 6265 } 6266 6267 secret->initialized = true; 6268 secret->secret = addr; 6269 6270 if (&net->ipv6.devconf_dflt->stable_secret == ctl->data) { 6271 struct net_device *dev; 6272 6273 for_each_netdev(net, dev) { 6274 struct inet6_dev *idev = __in6_dev_get(dev); 6275 6276 if (idev) { 6277 idev->cnf.addr_gen_mode = 6278 IN6_ADDR_GEN_MODE_STABLE_PRIVACY; 6279 } 6280 } 6281 } else { 6282 struct inet6_dev *idev = ctl->extra1; 6283 6284 idev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY; 6285 } 6286 6287 out: 6288 rtnl_unlock(); 6289 6290 return err; 6291 } 6292 6293 static 6294 int addrconf_sysctl_ignore_routes_with_linkdown(struct ctl_table *ctl, 6295 int write, 6296 void __user *buffer, 6297 size_t *lenp, 6298 loff_t *ppos) 6299 { 6300 int *valp = ctl->data; 6301 int val = *valp; 6302 loff_t pos = *ppos; 6303 struct ctl_table lctl; 6304 int ret; 6305 6306 /* ctl->data points to idev->cnf.ignore_routes_when_linkdown 6307 * we should not modify it until we get the rtnl lock. 6308 */ 6309 lctl = *ctl; 6310 lctl.data = &val; 6311 6312 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 6313 6314 if (write) 6315 ret = addrconf_fixup_linkdown(ctl, valp, val); 6316 if (ret) 6317 *ppos = pos; 6318 return ret; 6319 } 6320 6321 static 6322 void addrconf_set_nopolicy(struct rt6_info *rt, int action) 6323 { 6324 if (rt) { 6325 if (action) 6326 rt->dst.flags |= DST_NOPOLICY; 6327 else 6328 rt->dst.flags &= ~DST_NOPOLICY; 6329 } 6330 } 6331 6332 static 6333 void addrconf_disable_policy_idev(struct inet6_dev *idev, int val) 6334 { 6335 struct inet6_ifaddr *ifa; 6336 6337 read_lock_bh(&idev->lock); 6338 list_for_each_entry(ifa, &idev->addr_list, if_list) { 6339 spin_lock(&ifa->lock); 6340 if (ifa->rt) { 6341 struct fib6_info *rt = ifa->rt; 6342 int cpu; 6343 6344 rcu_read_lock(); 6345 ifa->rt->dst_nopolicy = val ? true : false; 6346 if (rt->rt6i_pcpu) { 6347 for_each_possible_cpu(cpu) { 6348 struct rt6_info **rtp; 6349 6350 rtp = per_cpu_ptr(rt->rt6i_pcpu, cpu); 6351 addrconf_set_nopolicy(*rtp, val); 6352 } 6353 } 6354 rcu_read_unlock(); 6355 } 6356 spin_unlock(&ifa->lock); 6357 } 6358 read_unlock_bh(&idev->lock); 6359 } 6360 6361 static 6362 int addrconf_disable_policy(struct ctl_table *ctl, int *valp, int val) 6363 { 6364 struct inet6_dev *idev; 6365 struct net *net; 6366 6367 if (!rtnl_trylock()) 6368 return restart_syscall(); 6369 6370 *valp = val; 6371 6372 net = (struct net *)ctl->extra2; 6373 if (valp == &net->ipv6.devconf_dflt->disable_policy) { 6374 rtnl_unlock(); 6375 return 0; 6376 } 6377 6378 if (valp == &net->ipv6.devconf_all->disable_policy) { 6379 struct net_device *dev; 6380 6381 for_each_netdev(net, dev) { 6382 idev = __in6_dev_get(dev); 6383 if (idev) 6384 addrconf_disable_policy_idev(idev, val); 6385 } 6386 } else { 6387 idev = (struct inet6_dev *)ctl->extra1; 6388 addrconf_disable_policy_idev(idev, val); 6389 } 6390 6391 rtnl_unlock(); 6392 return 0; 6393 } 6394 6395 static 6396 int addrconf_sysctl_disable_policy(struct ctl_table *ctl, int write, 6397 void __user *buffer, size_t *lenp, 6398 loff_t *ppos) 6399 { 6400 int *valp = ctl->data; 6401 int val = *valp; 6402 loff_t pos = *ppos; 6403 struct ctl_table lctl; 6404 int ret; 6405 6406 lctl = *ctl; 6407 lctl.data = &val; 6408 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 6409 6410 if (write && (*valp != val)) 6411 ret = addrconf_disable_policy(ctl, valp, val); 6412 6413 if (ret) 6414 *ppos = pos; 6415 6416 return ret; 6417 } 6418 6419 static int minus_one = -1; 6420 static const int zero = 0; 6421 static const int one = 1; 6422 static const int two_five_five = 255; 6423 6424 static const struct ctl_table addrconf_sysctl[] = { 6425 { 6426 .procname = "forwarding", 6427 .data = &ipv6_devconf.forwarding, 6428 .maxlen = sizeof(int), 6429 .mode = 0644, 6430 .proc_handler = addrconf_sysctl_forward, 6431 }, 6432 { 6433 .procname = "hop_limit", 6434 .data = &ipv6_devconf.hop_limit, 6435 .maxlen = sizeof(int), 6436 .mode = 0644, 6437 .proc_handler = proc_dointvec_minmax, 6438 .extra1 = (void *)&one, 6439 .extra2 = (void *)&two_five_five, 6440 }, 6441 { 6442 .procname = "mtu", 6443 .data = &ipv6_devconf.mtu6, 6444 .maxlen = sizeof(int), 6445 .mode = 0644, 6446 .proc_handler = addrconf_sysctl_mtu, 6447 }, 6448 { 6449 .procname = "accept_ra", 6450 .data = &ipv6_devconf.accept_ra, 6451 .maxlen = sizeof(int), 6452 .mode = 0644, 6453 .proc_handler = proc_dointvec, 6454 }, 6455 { 6456 .procname = "accept_redirects", 6457 .data = &ipv6_devconf.accept_redirects, 6458 .maxlen = sizeof(int), 6459 .mode = 0644, 6460 .proc_handler = proc_dointvec, 6461 }, 6462 { 6463 .procname = "autoconf", 6464 .data = &ipv6_devconf.autoconf, 6465 .maxlen = sizeof(int), 6466 .mode = 0644, 6467 .proc_handler = proc_dointvec, 6468 }, 6469 { 6470 .procname = "dad_transmits", 6471 .data = &ipv6_devconf.dad_transmits, 6472 .maxlen = sizeof(int), 6473 .mode = 0644, 6474 .proc_handler = proc_dointvec, 6475 }, 6476 { 6477 .procname = "router_solicitations", 6478 .data = &ipv6_devconf.rtr_solicits, 6479 .maxlen = sizeof(int), 6480 .mode = 0644, 6481 .proc_handler = proc_dointvec_minmax, 6482 .extra1 = &minus_one, 6483 }, 6484 { 6485 .procname = "router_solicitation_interval", 6486 .data = &ipv6_devconf.rtr_solicit_interval, 6487 .maxlen = sizeof(int), 6488 .mode = 0644, 6489 .proc_handler = proc_dointvec_jiffies, 6490 }, 6491 { 6492 .procname = "router_solicitation_max_interval", 6493 .data = &ipv6_devconf.rtr_solicit_max_interval, 6494 .maxlen = sizeof(int), 6495 .mode = 0644, 6496 .proc_handler = proc_dointvec_jiffies, 6497 }, 6498 { 6499 .procname = "router_solicitation_delay", 6500 .data = &ipv6_devconf.rtr_solicit_delay, 6501 .maxlen = sizeof(int), 6502 .mode = 0644, 6503 .proc_handler = proc_dointvec_jiffies, 6504 }, 6505 { 6506 .procname = "force_mld_version", 6507 .data = &ipv6_devconf.force_mld_version, 6508 .maxlen = sizeof(int), 6509 .mode = 0644, 6510 .proc_handler = proc_dointvec, 6511 }, 6512 { 6513 .procname = "mldv1_unsolicited_report_interval", 6514 .data = 6515 &ipv6_devconf.mldv1_unsolicited_report_interval, 6516 .maxlen = sizeof(int), 6517 .mode = 0644, 6518 .proc_handler = proc_dointvec_ms_jiffies, 6519 }, 6520 { 6521 .procname = "mldv2_unsolicited_report_interval", 6522 .data = 6523 &ipv6_devconf.mldv2_unsolicited_report_interval, 6524 .maxlen = sizeof(int), 6525 .mode = 0644, 6526 .proc_handler = proc_dointvec_ms_jiffies, 6527 }, 6528 { 6529 .procname = "use_tempaddr", 6530 .data = &ipv6_devconf.use_tempaddr, 6531 .maxlen = sizeof(int), 6532 .mode = 0644, 6533 .proc_handler = proc_dointvec, 6534 }, 6535 { 6536 .procname = "temp_valid_lft", 6537 .data = &ipv6_devconf.temp_valid_lft, 6538 .maxlen = sizeof(int), 6539 .mode = 0644, 6540 .proc_handler = proc_dointvec, 6541 }, 6542 { 6543 .procname = "temp_prefered_lft", 6544 .data = &ipv6_devconf.temp_prefered_lft, 6545 .maxlen = sizeof(int), 6546 .mode = 0644, 6547 .proc_handler = proc_dointvec, 6548 }, 6549 { 6550 .procname = "regen_max_retry", 6551 .data = &ipv6_devconf.regen_max_retry, 6552 .maxlen = sizeof(int), 6553 .mode = 0644, 6554 .proc_handler = proc_dointvec, 6555 }, 6556 { 6557 .procname = "max_desync_factor", 6558 .data = &ipv6_devconf.max_desync_factor, 6559 .maxlen = sizeof(int), 6560 .mode = 0644, 6561 .proc_handler = proc_dointvec, 6562 }, 6563 { 6564 .procname = "max_addresses", 6565 .data = &ipv6_devconf.max_addresses, 6566 .maxlen = sizeof(int), 6567 .mode = 0644, 6568 .proc_handler = proc_dointvec, 6569 }, 6570 { 6571 .procname = "accept_ra_defrtr", 6572 .data = &ipv6_devconf.accept_ra_defrtr, 6573 .maxlen = sizeof(int), 6574 .mode = 0644, 6575 .proc_handler = proc_dointvec, 6576 }, 6577 { 6578 .procname = "accept_ra_min_hop_limit", 6579 .data = &ipv6_devconf.accept_ra_min_hop_limit, 6580 .maxlen = sizeof(int), 6581 .mode = 0644, 6582 .proc_handler = proc_dointvec, 6583 }, 6584 { 6585 .procname = "accept_ra_pinfo", 6586 .data = &ipv6_devconf.accept_ra_pinfo, 6587 .maxlen = sizeof(int), 6588 .mode = 0644, 6589 .proc_handler = proc_dointvec, 6590 }, 6591 #ifdef CONFIG_IPV6_ROUTER_PREF 6592 { 6593 .procname = "accept_ra_rtr_pref", 6594 .data = &ipv6_devconf.accept_ra_rtr_pref, 6595 .maxlen = sizeof(int), 6596 .mode = 0644, 6597 .proc_handler = proc_dointvec, 6598 }, 6599 { 6600 .procname = "router_probe_interval", 6601 .data = &ipv6_devconf.rtr_probe_interval, 6602 .maxlen = sizeof(int), 6603 .mode = 0644, 6604 .proc_handler = proc_dointvec_jiffies, 6605 }, 6606 #ifdef CONFIG_IPV6_ROUTE_INFO 6607 { 6608 .procname = "accept_ra_rt_info_min_plen", 6609 .data = &ipv6_devconf.accept_ra_rt_info_min_plen, 6610 .maxlen = sizeof(int), 6611 .mode = 0644, 6612 .proc_handler = proc_dointvec, 6613 }, 6614 { 6615 .procname = "accept_ra_rt_info_max_plen", 6616 .data = &ipv6_devconf.accept_ra_rt_info_max_plen, 6617 .maxlen = sizeof(int), 6618 .mode = 0644, 6619 .proc_handler = proc_dointvec, 6620 }, 6621 #endif 6622 #endif 6623 { 6624 .procname = "proxy_ndp", 6625 .data = &ipv6_devconf.proxy_ndp, 6626 .maxlen = sizeof(int), 6627 .mode = 0644, 6628 .proc_handler = addrconf_sysctl_proxy_ndp, 6629 }, 6630 { 6631 .procname = "accept_source_route", 6632 .data = &ipv6_devconf.accept_source_route, 6633 .maxlen = sizeof(int), 6634 .mode = 0644, 6635 .proc_handler = proc_dointvec, 6636 }, 6637 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 6638 { 6639 .procname = "optimistic_dad", 6640 .data = &ipv6_devconf.optimistic_dad, 6641 .maxlen = sizeof(int), 6642 .mode = 0644, 6643 .proc_handler = proc_dointvec, 6644 }, 6645 { 6646 .procname = "use_optimistic", 6647 .data = &ipv6_devconf.use_optimistic, 6648 .maxlen = sizeof(int), 6649 .mode = 0644, 6650 .proc_handler = proc_dointvec, 6651 }, 6652 #endif 6653 #ifdef CONFIG_IPV6_MROUTE 6654 { 6655 .procname = "mc_forwarding", 6656 .data = &ipv6_devconf.mc_forwarding, 6657 .maxlen = sizeof(int), 6658 .mode = 0444, 6659 .proc_handler = proc_dointvec, 6660 }, 6661 #endif 6662 { 6663 .procname = "disable_ipv6", 6664 .data = &ipv6_devconf.disable_ipv6, 6665 .maxlen = sizeof(int), 6666 .mode = 0644, 6667 .proc_handler = addrconf_sysctl_disable, 6668 }, 6669 { 6670 .procname = "accept_dad", 6671 .data = &ipv6_devconf.accept_dad, 6672 .maxlen = sizeof(int), 6673 .mode = 0644, 6674 .proc_handler = proc_dointvec, 6675 }, 6676 { 6677 .procname = "force_tllao", 6678 .data = &ipv6_devconf.force_tllao, 6679 .maxlen = sizeof(int), 6680 .mode = 0644, 6681 .proc_handler = proc_dointvec 6682 }, 6683 { 6684 .procname = "ndisc_notify", 6685 .data = &ipv6_devconf.ndisc_notify, 6686 .maxlen = sizeof(int), 6687 .mode = 0644, 6688 .proc_handler = proc_dointvec 6689 }, 6690 { 6691 .procname = "suppress_frag_ndisc", 6692 .data = &ipv6_devconf.suppress_frag_ndisc, 6693 .maxlen = sizeof(int), 6694 .mode = 0644, 6695 .proc_handler = proc_dointvec 6696 }, 6697 { 6698 .procname = "accept_ra_from_local", 6699 .data = &ipv6_devconf.accept_ra_from_local, 6700 .maxlen = sizeof(int), 6701 .mode = 0644, 6702 .proc_handler = proc_dointvec, 6703 }, 6704 { 6705 .procname = "accept_ra_mtu", 6706 .data = &ipv6_devconf.accept_ra_mtu, 6707 .maxlen = sizeof(int), 6708 .mode = 0644, 6709 .proc_handler = proc_dointvec, 6710 }, 6711 { 6712 .procname = "stable_secret", 6713 .data = &ipv6_devconf.stable_secret, 6714 .maxlen = IPV6_MAX_STRLEN, 6715 .mode = 0600, 6716 .proc_handler = addrconf_sysctl_stable_secret, 6717 }, 6718 { 6719 .procname = "use_oif_addrs_only", 6720 .data = &ipv6_devconf.use_oif_addrs_only, 6721 .maxlen = sizeof(int), 6722 .mode = 0644, 6723 .proc_handler = proc_dointvec, 6724 }, 6725 { 6726 .procname = "ignore_routes_with_linkdown", 6727 .data = &ipv6_devconf.ignore_routes_with_linkdown, 6728 .maxlen = sizeof(int), 6729 .mode = 0644, 6730 .proc_handler = addrconf_sysctl_ignore_routes_with_linkdown, 6731 }, 6732 { 6733 .procname = "drop_unicast_in_l2_multicast", 6734 .data = &ipv6_devconf.drop_unicast_in_l2_multicast, 6735 .maxlen = sizeof(int), 6736 .mode = 0644, 6737 .proc_handler = proc_dointvec, 6738 }, 6739 { 6740 .procname = "drop_unsolicited_na", 6741 .data = &ipv6_devconf.drop_unsolicited_na, 6742 .maxlen = sizeof(int), 6743 .mode = 0644, 6744 .proc_handler = proc_dointvec, 6745 }, 6746 { 6747 .procname = "keep_addr_on_down", 6748 .data = &ipv6_devconf.keep_addr_on_down, 6749 .maxlen = sizeof(int), 6750 .mode = 0644, 6751 .proc_handler = proc_dointvec, 6752 6753 }, 6754 { 6755 .procname = "seg6_enabled", 6756 .data = &ipv6_devconf.seg6_enabled, 6757 .maxlen = sizeof(int), 6758 .mode = 0644, 6759 .proc_handler = proc_dointvec, 6760 }, 6761 #ifdef CONFIG_IPV6_SEG6_HMAC 6762 { 6763 .procname = "seg6_require_hmac", 6764 .data = &ipv6_devconf.seg6_require_hmac, 6765 .maxlen = sizeof(int), 6766 .mode = 0644, 6767 .proc_handler = proc_dointvec, 6768 }, 6769 #endif 6770 { 6771 .procname = "enhanced_dad", 6772 .data = &ipv6_devconf.enhanced_dad, 6773 .maxlen = sizeof(int), 6774 .mode = 0644, 6775 .proc_handler = proc_dointvec, 6776 }, 6777 { 6778 .procname = "addr_gen_mode", 6779 .data = &ipv6_devconf.addr_gen_mode, 6780 .maxlen = sizeof(int), 6781 .mode = 0644, 6782 .proc_handler = addrconf_sysctl_addr_gen_mode, 6783 }, 6784 { 6785 .procname = "disable_policy", 6786 .data = &ipv6_devconf.disable_policy, 6787 .maxlen = sizeof(int), 6788 .mode = 0644, 6789 .proc_handler = addrconf_sysctl_disable_policy, 6790 }, 6791 { 6792 .procname = "ndisc_tclass", 6793 .data = &ipv6_devconf.ndisc_tclass, 6794 .maxlen = sizeof(int), 6795 .mode = 0644, 6796 .proc_handler = proc_dointvec_minmax, 6797 .extra1 = (void *)&zero, 6798 .extra2 = (void *)&two_five_five, 6799 }, 6800 { 6801 /* sentinel */ 6802 } 6803 }; 6804 6805 static int __addrconf_sysctl_register(struct net *net, char *dev_name, 6806 struct inet6_dev *idev, struct ipv6_devconf *p) 6807 { 6808 int i, ifindex; 6809 struct ctl_table *table; 6810 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ]; 6811 6812 table = kmemdup(addrconf_sysctl, sizeof(addrconf_sysctl), GFP_KERNEL); 6813 if (!table) 6814 goto out; 6815 6816 for (i = 0; table[i].data; i++) { 6817 table[i].data += (char *)p - (char *)&ipv6_devconf; 6818 /* If one of these is already set, then it is not safe to 6819 * overwrite either of them: this makes proc_dointvec_minmax 6820 * usable. 6821 */ 6822 if (!table[i].extra1 && !table[i].extra2) { 6823 table[i].extra1 = idev; /* embedded; no ref */ 6824 table[i].extra2 = net; 6825 } 6826 } 6827 6828 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name); 6829 6830 p->sysctl_header = register_net_sysctl(net, path, table); 6831 if (!p->sysctl_header) 6832 goto free; 6833 6834 if (!strcmp(dev_name, "all")) 6835 ifindex = NETCONFA_IFINDEX_ALL; 6836 else if (!strcmp(dev_name, "default")) 6837 ifindex = NETCONFA_IFINDEX_DEFAULT; 6838 else 6839 ifindex = idev->dev->ifindex; 6840 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, NETCONFA_ALL, 6841 ifindex, p); 6842 return 0; 6843 6844 free: 6845 kfree(table); 6846 out: 6847 return -ENOBUFS; 6848 } 6849 6850 static void __addrconf_sysctl_unregister(struct net *net, 6851 struct ipv6_devconf *p, int ifindex) 6852 { 6853 struct ctl_table *table; 6854 6855 if (!p->sysctl_header) 6856 return; 6857 6858 table = p->sysctl_header->ctl_table_arg; 6859 unregister_net_sysctl_table(p->sysctl_header); 6860 p->sysctl_header = NULL; 6861 kfree(table); 6862 6863 inet6_netconf_notify_devconf(net, RTM_DELNETCONF, 0, ifindex, NULL); 6864 } 6865 6866 static int addrconf_sysctl_register(struct inet6_dev *idev) 6867 { 6868 int err; 6869 6870 if (!sysctl_dev_name_is_allowed(idev->dev->name)) 6871 return -EINVAL; 6872 6873 err = neigh_sysctl_register(idev->dev, idev->nd_parms, 6874 &ndisc_ifinfo_sysctl_change); 6875 if (err) 6876 return err; 6877 err = __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name, 6878 idev, &idev->cnf); 6879 if (err) 6880 neigh_sysctl_unregister(idev->nd_parms); 6881 6882 return err; 6883 } 6884 6885 static void addrconf_sysctl_unregister(struct inet6_dev *idev) 6886 { 6887 __addrconf_sysctl_unregister(dev_net(idev->dev), &idev->cnf, 6888 idev->dev->ifindex); 6889 neigh_sysctl_unregister(idev->nd_parms); 6890 } 6891 6892 6893 #endif 6894 6895 static int __net_init addrconf_init_net(struct net *net) 6896 { 6897 int err = -ENOMEM; 6898 struct ipv6_devconf *all, *dflt; 6899 6900 all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL); 6901 if (!all) 6902 goto err_alloc_all; 6903 6904 dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL); 6905 if (!dflt) 6906 goto err_alloc_dflt; 6907 6908 if (IS_ENABLED(CONFIG_SYSCTL) && 6909 sysctl_devconf_inherit_init_net == 1 && !net_eq(net, &init_net)) { 6910 memcpy(all, init_net.ipv6.devconf_all, sizeof(ipv6_devconf)); 6911 memcpy(dflt, init_net.ipv6.devconf_dflt, sizeof(ipv6_devconf_dflt)); 6912 } 6913 6914 /* these will be inherited by all namespaces */ 6915 dflt->autoconf = ipv6_defaults.autoconf; 6916 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6; 6917 6918 dflt->stable_secret.initialized = false; 6919 all->stable_secret.initialized = false; 6920 6921 net->ipv6.devconf_all = all; 6922 net->ipv6.devconf_dflt = dflt; 6923 6924 #ifdef CONFIG_SYSCTL 6925 err = __addrconf_sysctl_register(net, "all", NULL, all); 6926 if (err < 0) 6927 goto err_reg_all; 6928 6929 err = __addrconf_sysctl_register(net, "default", NULL, dflt); 6930 if (err < 0) 6931 goto err_reg_dflt; 6932 #endif 6933 return 0; 6934 6935 #ifdef CONFIG_SYSCTL 6936 err_reg_dflt: 6937 __addrconf_sysctl_unregister(net, all, NETCONFA_IFINDEX_ALL); 6938 err_reg_all: 6939 kfree(dflt); 6940 #endif 6941 err_alloc_dflt: 6942 kfree(all); 6943 err_alloc_all: 6944 return err; 6945 } 6946 6947 static void __net_exit addrconf_exit_net(struct net *net) 6948 { 6949 #ifdef CONFIG_SYSCTL 6950 __addrconf_sysctl_unregister(net, net->ipv6.devconf_dflt, 6951 NETCONFA_IFINDEX_DEFAULT); 6952 __addrconf_sysctl_unregister(net, net->ipv6.devconf_all, 6953 NETCONFA_IFINDEX_ALL); 6954 #endif 6955 kfree(net->ipv6.devconf_dflt); 6956 kfree(net->ipv6.devconf_all); 6957 } 6958 6959 static struct pernet_operations addrconf_ops = { 6960 .init = addrconf_init_net, 6961 .exit = addrconf_exit_net, 6962 }; 6963 6964 static struct rtnl_af_ops inet6_ops __read_mostly = { 6965 .family = AF_INET6, 6966 .fill_link_af = inet6_fill_link_af, 6967 .get_link_af_size = inet6_get_link_af_size, 6968 .validate_link_af = inet6_validate_link_af, 6969 .set_link_af = inet6_set_link_af, 6970 }; 6971 6972 /* 6973 * Init / cleanup code 6974 */ 6975 6976 int __init addrconf_init(void) 6977 { 6978 struct inet6_dev *idev; 6979 int i, err; 6980 6981 err = ipv6_addr_label_init(); 6982 if (err < 0) { 6983 pr_crit("%s: cannot initialize default policy table: %d\n", 6984 __func__, err); 6985 goto out; 6986 } 6987 6988 err = register_pernet_subsys(&addrconf_ops); 6989 if (err < 0) 6990 goto out_addrlabel; 6991 6992 addrconf_wq = create_workqueue("ipv6_addrconf"); 6993 if (!addrconf_wq) { 6994 err = -ENOMEM; 6995 goto out_nowq; 6996 } 6997 6998 /* The addrconf netdev notifier requires that loopback_dev 6999 * has it's ipv6 private information allocated and setup 7000 * before it can bring up and give link-local addresses 7001 * to other devices which are up. 7002 * 7003 * Unfortunately, loopback_dev is not necessarily the first 7004 * entry in the global dev_base list of net devices. In fact, 7005 * it is likely to be the very last entry on that list. 7006 * So this causes the notifier registry below to try and 7007 * give link-local addresses to all devices besides loopback_dev 7008 * first, then loopback_dev, which cases all the non-loopback_dev 7009 * devices to fail to get a link-local address. 7010 * 7011 * So, as a temporary fix, allocate the ipv6 structure for 7012 * loopback_dev first by hand. 7013 * Longer term, all of the dependencies ipv6 has upon the loopback 7014 * device and it being up should be removed. 7015 */ 7016 rtnl_lock(); 7017 idev = ipv6_add_dev(init_net.loopback_dev); 7018 rtnl_unlock(); 7019 if (IS_ERR(idev)) { 7020 err = PTR_ERR(idev); 7021 goto errlo; 7022 } 7023 7024 ip6_route_init_special_entries(); 7025 7026 for (i = 0; i < IN6_ADDR_HSIZE; i++) 7027 INIT_HLIST_HEAD(&inet6_addr_lst[i]); 7028 7029 register_netdevice_notifier(&ipv6_dev_notf); 7030 7031 addrconf_verify(); 7032 7033 rtnl_af_register(&inet6_ops); 7034 7035 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETLINK, 7036 NULL, inet6_dump_ifinfo, 0); 7037 if (err < 0) 7038 goto errout; 7039 7040 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_NEWADDR, 7041 inet6_rtm_newaddr, NULL, 0); 7042 if (err < 0) 7043 goto errout; 7044 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_DELADDR, 7045 inet6_rtm_deladdr, NULL, 0); 7046 if (err < 0) 7047 goto errout; 7048 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETADDR, 7049 inet6_rtm_getaddr, inet6_dump_ifaddr, 7050 RTNL_FLAG_DOIT_UNLOCKED); 7051 if (err < 0) 7052 goto errout; 7053 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETMULTICAST, 7054 NULL, inet6_dump_ifmcaddr, 0); 7055 if (err < 0) 7056 goto errout; 7057 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETANYCAST, 7058 NULL, inet6_dump_ifacaddr, 0); 7059 if (err < 0) 7060 goto errout; 7061 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETNETCONF, 7062 inet6_netconf_get_devconf, 7063 inet6_netconf_dump_devconf, 7064 RTNL_FLAG_DOIT_UNLOCKED); 7065 if (err < 0) 7066 goto errout; 7067 err = ipv6_addr_label_rtnl_register(); 7068 if (err < 0) 7069 goto errout; 7070 7071 return 0; 7072 errout: 7073 rtnl_unregister_all(PF_INET6); 7074 rtnl_af_unregister(&inet6_ops); 7075 unregister_netdevice_notifier(&ipv6_dev_notf); 7076 errlo: 7077 destroy_workqueue(addrconf_wq); 7078 out_nowq: 7079 unregister_pernet_subsys(&addrconf_ops); 7080 out_addrlabel: 7081 ipv6_addr_label_cleanup(); 7082 out: 7083 return err; 7084 } 7085 7086 void addrconf_cleanup(void) 7087 { 7088 struct net_device *dev; 7089 int i; 7090 7091 unregister_netdevice_notifier(&ipv6_dev_notf); 7092 unregister_pernet_subsys(&addrconf_ops); 7093 ipv6_addr_label_cleanup(); 7094 7095 rtnl_af_unregister(&inet6_ops); 7096 7097 rtnl_lock(); 7098 7099 /* clean dev list */ 7100 for_each_netdev(&init_net, dev) { 7101 if (__in6_dev_get(dev) == NULL) 7102 continue; 7103 addrconf_ifdown(dev, 1); 7104 } 7105 addrconf_ifdown(init_net.loopback_dev, 2); 7106 7107 /* 7108 * Check hash table. 7109 */ 7110 spin_lock_bh(&addrconf_hash_lock); 7111 for (i = 0; i < IN6_ADDR_HSIZE; i++) 7112 WARN_ON(!hlist_empty(&inet6_addr_lst[i])); 7113 spin_unlock_bh(&addrconf_hash_lock); 7114 cancel_delayed_work(&addr_chk_work); 7115 rtnl_unlock(); 7116 7117 destroy_workqueue(addrconf_wq); 7118 } 7119