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 bool no_gw); 178 179 static void addrconf_dad_start(struct inet6_ifaddr *ifp); 180 static void addrconf_dad_work(struct work_struct *w); 181 static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id, 182 bool send_na); 183 static void addrconf_dad_run(struct inet6_dev *idev, bool restart); 184 static void addrconf_rs_timer(struct timer_list *t); 185 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa); 186 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa); 187 188 static void inet6_prefix_notify(int event, struct inet6_dev *idev, 189 struct prefix_info *pinfo); 190 191 static struct ipv6_devconf ipv6_devconf __read_mostly = { 192 .forwarding = 0, 193 .hop_limit = IPV6_DEFAULT_HOPLIMIT, 194 .mtu6 = IPV6_MIN_MTU, 195 .accept_ra = 1, 196 .accept_redirects = 1, 197 .autoconf = 1, 198 .force_mld_version = 0, 199 .mldv1_unsolicited_report_interval = 10 * HZ, 200 .mldv2_unsolicited_report_interval = HZ, 201 .dad_transmits = 1, 202 .rtr_solicits = MAX_RTR_SOLICITATIONS, 203 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL, 204 .rtr_solicit_max_interval = RTR_SOLICITATION_MAX_INTERVAL, 205 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY, 206 .use_tempaddr = 0, 207 .temp_valid_lft = TEMP_VALID_LIFETIME, 208 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME, 209 .regen_max_retry = REGEN_MAX_RETRY, 210 .max_desync_factor = MAX_DESYNC_FACTOR, 211 .max_addresses = IPV6_MAX_ADDRESSES, 212 .accept_ra_defrtr = 1, 213 .accept_ra_from_local = 0, 214 .accept_ra_min_hop_limit= 1, 215 .accept_ra_pinfo = 1, 216 #ifdef CONFIG_IPV6_ROUTER_PREF 217 .accept_ra_rtr_pref = 1, 218 .rtr_probe_interval = 60 * HZ, 219 #ifdef CONFIG_IPV6_ROUTE_INFO 220 .accept_ra_rt_info_min_plen = 0, 221 .accept_ra_rt_info_max_plen = 0, 222 #endif 223 #endif 224 .proxy_ndp = 0, 225 .accept_source_route = 0, /* we do not accept RH0 by default. */ 226 .disable_ipv6 = 0, 227 .accept_dad = 0, 228 .suppress_frag_ndisc = 1, 229 .accept_ra_mtu = 1, 230 .stable_secret = { 231 .initialized = false, 232 }, 233 .use_oif_addrs_only = 0, 234 .ignore_routes_with_linkdown = 0, 235 .keep_addr_on_down = 0, 236 .seg6_enabled = 0, 237 #ifdef CONFIG_IPV6_SEG6_HMAC 238 .seg6_require_hmac = 0, 239 #endif 240 .enhanced_dad = 1, 241 .addr_gen_mode = IN6_ADDR_GEN_MODE_EUI64, 242 .disable_policy = 0, 243 }; 244 245 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = { 246 .forwarding = 0, 247 .hop_limit = IPV6_DEFAULT_HOPLIMIT, 248 .mtu6 = IPV6_MIN_MTU, 249 .accept_ra = 1, 250 .accept_redirects = 1, 251 .autoconf = 1, 252 .force_mld_version = 0, 253 .mldv1_unsolicited_report_interval = 10 * HZ, 254 .mldv2_unsolicited_report_interval = HZ, 255 .dad_transmits = 1, 256 .rtr_solicits = MAX_RTR_SOLICITATIONS, 257 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL, 258 .rtr_solicit_max_interval = RTR_SOLICITATION_MAX_INTERVAL, 259 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY, 260 .use_tempaddr = 0, 261 .temp_valid_lft = TEMP_VALID_LIFETIME, 262 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME, 263 .regen_max_retry = REGEN_MAX_RETRY, 264 .max_desync_factor = MAX_DESYNC_FACTOR, 265 .max_addresses = IPV6_MAX_ADDRESSES, 266 .accept_ra_defrtr = 1, 267 .accept_ra_from_local = 0, 268 .accept_ra_min_hop_limit= 1, 269 .accept_ra_pinfo = 1, 270 #ifdef CONFIG_IPV6_ROUTER_PREF 271 .accept_ra_rtr_pref = 1, 272 .rtr_probe_interval = 60 * HZ, 273 #ifdef CONFIG_IPV6_ROUTE_INFO 274 .accept_ra_rt_info_min_plen = 0, 275 .accept_ra_rt_info_max_plen = 0, 276 #endif 277 #endif 278 .proxy_ndp = 0, 279 .accept_source_route = 0, /* we do not accept RH0 by default. */ 280 .disable_ipv6 = 0, 281 .accept_dad = 1, 282 .suppress_frag_ndisc = 1, 283 .accept_ra_mtu = 1, 284 .stable_secret = { 285 .initialized = false, 286 }, 287 .use_oif_addrs_only = 0, 288 .ignore_routes_with_linkdown = 0, 289 .keep_addr_on_down = 0, 290 .seg6_enabled = 0, 291 #ifdef CONFIG_IPV6_SEG6_HMAC 292 .seg6_require_hmac = 0, 293 #endif 294 .enhanced_dad = 1, 295 .addr_gen_mode = IN6_ADDR_GEN_MODE_EUI64, 296 .disable_policy = 0, 297 }; 298 299 /* Check if link is ready: is it up and is a valid qdisc available */ 300 static inline bool addrconf_link_ready(const struct net_device *dev) 301 { 302 return netif_oper_up(dev) && !qdisc_tx_is_noop(dev); 303 } 304 305 static void addrconf_del_rs_timer(struct inet6_dev *idev) 306 { 307 if (del_timer(&idev->rs_timer)) 308 __in6_dev_put(idev); 309 } 310 311 static void addrconf_del_dad_work(struct inet6_ifaddr *ifp) 312 { 313 if (cancel_delayed_work(&ifp->dad_work)) 314 __in6_ifa_put(ifp); 315 } 316 317 static void addrconf_mod_rs_timer(struct inet6_dev *idev, 318 unsigned long when) 319 { 320 if (!timer_pending(&idev->rs_timer)) 321 in6_dev_hold(idev); 322 mod_timer(&idev->rs_timer, jiffies + when); 323 } 324 325 static void addrconf_mod_dad_work(struct inet6_ifaddr *ifp, 326 unsigned long delay) 327 { 328 in6_ifa_hold(ifp); 329 if (mod_delayed_work(addrconf_wq, &ifp->dad_work, delay)) 330 in6_ifa_put(ifp); 331 } 332 333 static int snmp6_alloc_dev(struct inet6_dev *idev) 334 { 335 int i; 336 337 idev->stats.ipv6 = alloc_percpu(struct ipstats_mib); 338 if (!idev->stats.ipv6) 339 goto err_ip; 340 341 for_each_possible_cpu(i) { 342 struct ipstats_mib *addrconf_stats; 343 addrconf_stats = per_cpu_ptr(idev->stats.ipv6, i); 344 u64_stats_init(&addrconf_stats->syncp); 345 } 346 347 348 idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device), 349 GFP_KERNEL); 350 if (!idev->stats.icmpv6dev) 351 goto err_icmp; 352 idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device), 353 GFP_KERNEL); 354 if (!idev->stats.icmpv6msgdev) 355 goto err_icmpmsg; 356 357 return 0; 358 359 err_icmpmsg: 360 kfree(idev->stats.icmpv6dev); 361 err_icmp: 362 free_percpu(idev->stats.ipv6); 363 err_ip: 364 return -ENOMEM; 365 } 366 367 static struct inet6_dev *ipv6_add_dev(struct net_device *dev) 368 { 369 struct inet6_dev *ndev; 370 int err = -ENOMEM; 371 372 ASSERT_RTNL(); 373 374 if (dev->mtu < IPV6_MIN_MTU) 375 return ERR_PTR(-EINVAL); 376 377 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL); 378 if (!ndev) 379 return ERR_PTR(err); 380 381 rwlock_init(&ndev->lock); 382 ndev->dev = dev; 383 INIT_LIST_HEAD(&ndev->addr_list); 384 timer_setup(&ndev->rs_timer, addrconf_rs_timer, 0); 385 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf)); 386 387 if (ndev->cnf.stable_secret.initialized) 388 ndev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY; 389 390 ndev->cnf.mtu6 = dev->mtu; 391 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl); 392 if (!ndev->nd_parms) { 393 kfree(ndev); 394 return ERR_PTR(err); 395 } 396 if (ndev->cnf.forwarding) 397 dev_disable_lro(dev); 398 /* We refer to the device */ 399 dev_hold(dev); 400 401 if (snmp6_alloc_dev(ndev) < 0) { 402 netdev_dbg(dev, "%s: cannot allocate memory for statistics\n", 403 __func__); 404 neigh_parms_release(&nd_tbl, ndev->nd_parms); 405 dev_put(dev); 406 kfree(ndev); 407 return ERR_PTR(err); 408 } 409 410 if (snmp6_register_dev(ndev) < 0) { 411 netdev_dbg(dev, "%s: cannot create /proc/net/dev_snmp6/%s\n", 412 __func__, dev->name); 413 goto err_release; 414 } 415 416 /* One reference from device. */ 417 refcount_set(&ndev->refcnt, 1); 418 419 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK)) 420 ndev->cnf.accept_dad = -1; 421 422 #if IS_ENABLED(CONFIG_IPV6_SIT) 423 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) { 424 pr_info("%s: Disabled Multicast RS\n", dev->name); 425 ndev->cnf.rtr_solicits = 0; 426 } 427 #endif 428 429 INIT_LIST_HEAD(&ndev->tempaddr_list); 430 ndev->desync_factor = U32_MAX; 431 if ((dev->flags&IFF_LOOPBACK) || 432 dev->type == ARPHRD_TUNNEL || 433 dev->type == ARPHRD_TUNNEL6 || 434 dev->type == ARPHRD_SIT || 435 dev->type == ARPHRD_NONE) { 436 ndev->cnf.use_tempaddr = -1; 437 } else 438 ipv6_regen_rndid(ndev); 439 440 ndev->token = in6addr_any; 441 442 if (netif_running(dev) && addrconf_link_ready(dev)) 443 ndev->if_flags |= IF_READY; 444 445 ipv6_mc_init_dev(ndev); 446 ndev->tstamp = jiffies; 447 err = addrconf_sysctl_register(ndev); 448 if (err) { 449 ipv6_mc_destroy_dev(ndev); 450 snmp6_unregister_dev(ndev); 451 goto err_release; 452 } 453 /* protected by rtnl_lock */ 454 rcu_assign_pointer(dev->ip6_ptr, ndev); 455 456 /* Join interface-local all-node multicast group */ 457 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allnodes); 458 459 /* Join all-node multicast group */ 460 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes); 461 462 /* Join all-router multicast group if forwarding is set */ 463 if (ndev->cnf.forwarding && (dev->flags & IFF_MULTICAST)) 464 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters); 465 466 return ndev; 467 468 err_release: 469 neigh_parms_release(&nd_tbl, ndev->nd_parms); 470 ndev->dead = 1; 471 in6_dev_finish_destroy(ndev); 472 return ERR_PTR(err); 473 } 474 475 static struct inet6_dev *ipv6_find_idev(struct net_device *dev) 476 { 477 struct inet6_dev *idev; 478 479 ASSERT_RTNL(); 480 481 idev = __in6_dev_get(dev); 482 if (!idev) { 483 idev = ipv6_add_dev(dev); 484 if (IS_ERR(idev)) 485 return NULL; 486 } 487 488 if (dev->flags&IFF_UP) 489 ipv6_mc_up(idev); 490 return idev; 491 } 492 493 static int inet6_netconf_msgsize_devconf(int type) 494 { 495 int size = NLMSG_ALIGN(sizeof(struct netconfmsg)) 496 + nla_total_size(4); /* NETCONFA_IFINDEX */ 497 bool all = false; 498 499 if (type == NETCONFA_ALL) 500 all = true; 501 502 if (all || type == NETCONFA_FORWARDING) 503 size += nla_total_size(4); 504 #ifdef CONFIG_IPV6_MROUTE 505 if (all || type == NETCONFA_MC_FORWARDING) 506 size += nla_total_size(4); 507 #endif 508 if (all || type == NETCONFA_PROXY_NEIGH) 509 size += nla_total_size(4); 510 511 if (all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN) 512 size += nla_total_size(4); 513 514 return size; 515 } 516 517 static int inet6_netconf_fill_devconf(struct sk_buff *skb, int ifindex, 518 struct ipv6_devconf *devconf, u32 portid, 519 u32 seq, int event, unsigned int flags, 520 int type) 521 { 522 struct nlmsghdr *nlh; 523 struct netconfmsg *ncm; 524 bool all = false; 525 526 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg), 527 flags); 528 if (!nlh) 529 return -EMSGSIZE; 530 531 if (type == NETCONFA_ALL) 532 all = true; 533 534 ncm = nlmsg_data(nlh); 535 ncm->ncm_family = AF_INET6; 536 537 if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0) 538 goto nla_put_failure; 539 540 if (!devconf) 541 goto out; 542 543 if ((all || type == NETCONFA_FORWARDING) && 544 nla_put_s32(skb, NETCONFA_FORWARDING, devconf->forwarding) < 0) 545 goto nla_put_failure; 546 #ifdef CONFIG_IPV6_MROUTE 547 if ((all || type == NETCONFA_MC_FORWARDING) && 548 nla_put_s32(skb, NETCONFA_MC_FORWARDING, 549 devconf->mc_forwarding) < 0) 550 goto nla_put_failure; 551 #endif 552 if ((all || type == NETCONFA_PROXY_NEIGH) && 553 nla_put_s32(skb, NETCONFA_PROXY_NEIGH, devconf->proxy_ndp) < 0) 554 goto nla_put_failure; 555 556 if ((all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN) && 557 nla_put_s32(skb, NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN, 558 devconf->ignore_routes_with_linkdown) < 0) 559 goto nla_put_failure; 560 561 out: 562 nlmsg_end(skb, nlh); 563 return 0; 564 565 nla_put_failure: 566 nlmsg_cancel(skb, nlh); 567 return -EMSGSIZE; 568 } 569 570 void inet6_netconf_notify_devconf(struct net *net, int event, int type, 571 int ifindex, struct ipv6_devconf *devconf) 572 { 573 struct sk_buff *skb; 574 int err = -ENOBUFS; 575 576 skb = nlmsg_new(inet6_netconf_msgsize_devconf(type), GFP_KERNEL); 577 if (!skb) 578 goto errout; 579 580 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 0, 0, 581 event, 0, type); 582 if (err < 0) { 583 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */ 584 WARN_ON(err == -EMSGSIZE); 585 kfree_skb(skb); 586 goto errout; 587 } 588 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_NETCONF, NULL, GFP_KERNEL); 589 return; 590 errout: 591 rtnl_set_sk_err(net, RTNLGRP_IPV6_NETCONF, err); 592 } 593 594 static const struct nla_policy devconf_ipv6_policy[NETCONFA_MAX+1] = { 595 [NETCONFA_IFINDEX] = { .len = sizeof(int) }, 596 [NETCONFA_FORWARDING] = { .len = sizeof(int) }, 597 [NETCONFA_PROXY_NEIGH] = { .len = sizeof(int) }, 598 [NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN] = { .len = sizeof(int) }, 599 }; 600 601 static int inet6_netconf_valid_get_req(struct sk_buff *skb, 602 const struct nlmsghdr *nlh, 603 struct nlattr **tb, 604 struct netlink_ext_ack *extack) 605 { 606 int i, err; 607 608 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(struct netconfmsg))) { 609 NL_SET_ERR_MSG_MOD(extack, "Invalid header for netconf get request"); 610 return -EINVAL; 611 } 612 613 if (!netlink_strict_get_check(skb)) 614 return nlmsg_parse(nlh, sizeof(struct netconfmsg), tb, 615 NETCONFA_MAX, devconf_ipv6_policy, extack); 616 617 err = nlmsg_parse_strict(nlh, sizeof(struct netconfmsg), tb, 618 NETCONFA_MAX, devconf_ipv6_policy, extack); 619 if (err) 620 return err; 621 622 for (i = 0; i <= NETCONFA_MAX; i++) { 623 if (!tb[i]) 624 continue; 625 626 switch (i) { 627 case NETCONFA_IFINDEX: 628 break; 629 default: 630 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in netconf get request"); 631 return -EINVAL; 632 } 633 } 634 635 return 0; 636 } 637 638 static int inet6_netconf_get_devconf(struct sk_buff *in_skb, 639 struct nlmsghdr *nlh, 640 struct netlink_ext_ack *extack) 641 { 642 struct net *net = sock_net(in_skb->sk); 643 struct nlattr *tb[NETCONFA_MAX+1]; 644 struct inet6_dev *in6_dev = NULL; 645 struct net_device *dev = NULL; 646 struct sk_buff *skb; 647 struct ipv6_devconf *devconf; 648 int ifindex; 649 int err; 650 651 err = inet6_netconf_valid_get_req(in_skb, nlh, tb, extack); 652 if (err < 0) 653 return err; 654 655 if (!tb[NETCONFA_IFINDEX]) 656 return -EINVAL; 657 658 err = -EINVAL; 659 ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]); 660 switch (ifindex) { 661 case NETCONFA_IFINDEX_ALL: 662 devconf = net->ipv6.devconf_all; 663 break; 664 case NETCONFA_IFINDEX_DEFAULT: 665 devconf = net->ipv6.devconf_dflt; 666 break; 667 default: 668 dev = dev_get_by_index(net, ifindex); 669 if (!dev) 670 return -EINVAL; 671 in6_dev = in6_dev_get(dev); 672 if (!in6_dev) 673 goto errout; 674 devconf = &in6_dev->cnf; 675 break; 676 } 677 678 err = -ENOBUFS; 679 skb = nlmsg_new(inet6_netconf_msgsize_devconf(NETCONFA_ALL), GFP_KERNEL); 680 if (!skb) 681 goto errout; 682 683 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 684 NETLINK_CB(in_skb).portid, 685 nlh->nlmsg_seq, RTM_NEWNETCONF, 0, 686 NETCONFA_ALL); 687 if (err < 0) { 688 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */ 689 WARN_ON(err == -EMSGSIZE); 690 kfree_skb(skb); 691 goto errout; 692 } 693 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid); 694 errout: 695 if (in6_dev) 696 in6_dev_put(in6_dev); 697 if (dev) 698 dev_put(dev); 699 return err; 700 } 701 702 static int inet6_netconf_dump_devconf(struct sk_buff *skb, 703 struct netlink_callback *cb) 704 { 705 const struct nlmsghdr *nlh = cb->nlh; 706 struct net *net = sock_net(skb->sk); 707 int h, s_h; 708 int idx, s_idx; 709 struct net_device *dev; 710 struct inet6_dev *idev; 711 struct hlist_head *head; 712 713 if (cb->strict_check) { 714 struct netlink_ext_ack *extack = cb->extack; 715 struct netconfmsg *ncm; 716 717 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ncm))) { 718 NL_SET_ERR_MSG_MOD(extack, "Invalid header for netconf dump request"); 719 return -EINVAL; 720 } 721 722 if (nlmsg_attrlen(nlh, sizeof(*ncm))) { 723 NL_SET_ERR_MSG_MOD(extack, "Invalid data after header in netconf dump request"); 724 return -EINVAL; 725 } 726 } 727 728 s_h = cb->args[0]; 729 s_idx = idx = cb->args[1]; 730 731 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 732 idx = 0; 733 head = &net->dev_index_head[h]; 734 rcu_read_lock(); 735 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ 736 net->dev_base_seq; 737 hlist_for_each_entry_rcu(dev, head, index_hlist) { 738 if (idx < s_idx) 739 goto cont; 740 idev = __in6_dev_get(dev); 741 if (!idev) 742 goto cont; 743 744 if (inet6_netconf_fill_devconf(skb, dev->ifindex, 745 &idev->cnf, 746 NETLINK_CB(cb->skb).portid, 747 nlh->nlmsg_seq, 748 RTM_NEWNETCONF, 749 NLM_F_MULTI, 750 NETCONFA_ALL) < 0) { 751 rcu_read_unlock(); 752 goto done; 753 } 754 nl_dump_check_consistent(cb, nlmsg_hdr(skb)); 755 cont: 756 idx++; 757 } 758 rcu_read_unlock(); 759 } 760 if (h == NETDEV_HASHENTRIES) { 761 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL, 762 net->ipv6.devconf_all, 763 NETLINK_CB(cb->skb).portid, 764 nlh->nlmsg_seq, 765 RTM_NEWNETCONF, NLM_F_MULTI, 766 NETCONFA_ALL) < 0) 767 goto done; 768 else 769 h++; 770 } 771 if (h == NETDEV_HASHENTRIES + 1) { 772 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT, 773 net->ipv6.devconf_dflt, 774 NETLINK_CB(cb->skb).portid, 775 nlh->nlmsg_seq, 776 RTM_NEWNETCONF, NLM_F_MULTI, 777 NETCONFA_ALL) < 0) 778 goto done; 779 else 780 h++; 781 } 782 done: 783 cb->args[0] = h; 784 cb->args[1] = idx; 785 786 return skb->len; 787 } 788 789 #ifdef CONFIG_SYSCTL 790 static void dev_forward_change(struct inet6_dev *idev) 791 { 792 struct net_device *dev; 793 struct inet6_ifaddr *ifa; 794 795 if (!idev) 796 return; 797 dev = idev->dev; 798 if (idev->cnf.forwarding) 799 dev_disable_lro(dev); 800 if (dev->flags & IFF_MULTICAST) { 801 if (idev->cnf.forwarding) { 802 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters); 803 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allrouters); 804 ipv6_dev_mc_inc(dev, &in6addr_sitelocal_allrouters); 805 } else { 806 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters); 807 ipv6_dev_mc_dec(dev, &in6addr_interfacelocal_allrouters); 808 ipv6_dev_mc_dec(dev, &in6addr_sitelocal_allrouters); 809 } 810 } 811 812 list_for_each_entry(ifa, &idev->addr_list, if_list) { 813 if (ifa->flags&IFA_F_TENTATIVE) 814 continue; 815 if (idev->cnf.forwarding) 816 addrconf_join_anycast(ifa); 817 else 818 addrconf_leave_anycast(ifa); 819 } 820 inet6_netconf_notify_devconf(dev_net(dev), RTM_NEWNETCONF, 821 NETCONFA_FORWARDING, 822 dev->ifindex, &idev->cnf); 823 } 824 825 826 static void addrconf_forward_change(struct net *net, __s32 newf) 827 { 828 struct net_device *dev; 829 struct inet6_dev *idev; 830 831 for_each_netdev(net, dev) { 832 idev = __in6_dev_get(dev); 833 if (idev) { 834 int changed = (!idev->cnf.forwarding) ^ (!newf); 835 idev->cnf.forwarding = newf; 836 if (changed) 837 dev_forward_change(idev); 838 } 839 } 840 } 841 842 static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf) 843 { 844 struct net *net; 845 int old; 846 847 if (!rtnl_trylock()) 848 return restart_syscall(); 849 850 net = (struct net *)table->extra2; 851 old = *p; 852 *p = newf; 853 854 if (p == &net->ipv6.devconf_dflt->forwarding) { 855 if ((!newf) ^ (!old)) 856 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 857 NETCONFA_FORWARDING, 858 NETCONFA_IFINDEX_DEFAULT, 859 net->ipv6.devconf_dflt); 860 rtnl_unlock(); 861 return 0; 862 } 863 864 if (p == &net->ipv6.devconf_all->forwarding) { 865 int old_dflt = net->ipv6.devconf_dflt->forwarding; 866 867 net->ipv6.devconf_dflt->forwarding = newf; 868 if ((!newf) ^ (!old_dflt)) 869 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 870 NETCONFA_FORWARDING, 871 NETCONFA_IFINDEX_DEFAULT, 872 net->ipv6.devconf_dflt); 873 874 addrconf_forward_change(net, newf); 875 if ((!newf) ^ (!old)) 876 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 877 NETCONFA_FORWARDING, 878 NETCONFA_IFINDEX_ALL, 879 net->ipv6.devconf_all); 880 } else if ((!newf) ^ (!old)) 881 dev_forward_change((struct inet6_dev *)table->extra1); 882 rtnl_unlock(); 883 884 if (newf) 885 rt6_purge_dflt_routers(net); 886 return 1; 887 } 888 889 static void addrconf_linkdown_change(struct net *net, __s32 newf) 890 { 891 struct net_device *dev; 892 struct inet6_dev *idev; 893 894 for_each_netdev(net, dev) { 895 idev = __in6_dev_get(dev); 896 if (idev) { 897 int changed = (!idev->cnf.ignore_routes_with_linkdown) ^ (!newf); 898 899 idev->cnf.ignore_routes_with_linkdown = newf; 900 if (changed) 901 inet6_netconf_notify_devconf(dev_net(dev), 902 RTM_NEWNETCONF, 903 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN, 904 dev->ifindex, 905 &idev->cnf); 906 } 907 } 908 } 909 910 static int addrconf_fixup_linkdown(struct ctl_table *table, int *p, int newf) 911 { 912 struct net *net; 913 int old; 914 915 if (!rtnl_trylock()) 916 return restart_syscall(); 917 918 net = (struct net *)table->extra2; 919 old = *p; 920 *p = newf; 921 922 if (p == &net->ipv6.devconf_dflt->ignore_routes_with_linkdown) { 923 if ((!newf) ^ (!old)) 924 inet6_netconf_notify_devconf(net, 925 RTM_NEWNETCONF, 926 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN, 927 NETCONFA_IFINDEX_DEFAULT, 928 net->ipv6.devconf_dflt); 929 rtnl_unlock(); 930 return 0; 931 } 932 933 if (p == &net->ipv6.devconf_all->ignore_routes_with_linkdown) { 934 net->ipv6.devconf_dflt->ignore_routes_with_linkdown = newf; 935 addrconf_linkdown_change(net, newf); 936 if ((!newf) ^ (!old)) 937 inet6_netconf_notify_devconf(net, 938 RTM_NEWNETCONF, 939 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN, 940 NETCONFA_IFINDEX_ALL, 941 net->ipv6.devconf_all); 942 } 943 rtnl_unlock(); 944 945 return 1; 946 } 947 948 #endif 949 950 /* Nobody refers to this ifaddr, destroy it */ 951 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp) 952 { 953 WARN_ON(!hlist_unhashed(&ifp->addr_lst)); 954 955 #ifdef NET_REFCNT_DEBUG 956 pr_debug("%s\n", __func__); 957 #endif 958 959 in6_dev_put(ifp->idev); 960 961 if (cancel_delayed_work(&ifp->dad_work)) 962 pr_notice("delayed DAD work was pending while freeing ifa=%p\n", 963 ifp); 964 965 if (ifp->state != INET6_IFADDR_STATE_DEAD) { 966 pr_warn("Freeing alive inet6 address %p\n", ifp); 967 return; 968 } 969 970 kfree_rcu(ifp, rcu); 971 } 972 973 static void 974 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp) 975 { 976 struct list_head *p; 977 int ifp_scope = ipv6_addr_src_scope(&ifp->addr); 978 979 /* 980 * Each device address list is sorted in order of scope - 981 * global before linklocal. 982 */ 983 list_for_each(p, &idev->addr_list) { 984 struct inet6_ifaddr *ifa 985 = list_entry(p, struct inet6_ifaddr, if_list); 986 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr)) 987 break; 988 } 989 990 list_add_tail_rcu(&ifp->if_list, p); 991 } 992 993 static u32 inet6_addr_hash(const struct net *net, const struct in6_addr *addr) 994 { 995 u32 val = ipv6_addr_hash(addr) ^ net_hash_mix(net); 996 997 return hash_32(val, IN6_ADDR_HSIZE_SHIFT); 998 } 999 1000 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr, 1001 struct net_device *dev, unsigned int hash) 1002 { 1003 struct inet6_ifaddr *ifp; 1004 1005 hlist_for_each_entry(ifp, &inet6_addr_lst[hash], addr_lst) { 1006 if (!net_eq(dev_net(ifp->idev->dev), net)) 1007 continue; 1008 if (ipv6_addr_equal(&ifp->addr, addr)) { 1009 if (!dev || ifp->idev->dev == dev) 1010 return true; 1011 } 1012 } 1013 return false; 1014 } 1015 1016 static int ipv6_add_addr_hash(struct net_device *dev, struct inet6_ifaddr *ifa) 1017 { 1018 unsigned int hash = inet6_addr_hash(dev_net(dev), &ifa->addr); 1019 int err = 0; 1020 1021 spin_lock(&addrconf_hash_lock); 1022 1023 /* Ignore adding duplicate addresses on an interface */ 1024 if (ipv6_chk_same_addr(dev_net(dev), &ifa->addr, dev, hash)) { 1025 netdev_dbg(dev, "ipv6_add_addr: already assigned\n"); 1026 err = -EEXIST; 1027 } else { 1028 hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]); 1029 } 1030 1031 spin_unlock(&addrconf_hash_lock); 1032 1033 return err; 1034 } 1035 1036 /* On success it returns ifp with increased reference count */ 1037 1038 static struct inet6_ifaddr * 1039 ipv6_add_addr(struct inet6_dev *idev, struct ifa6_config *cfg, 1040 bool can_block, struct netlink_ext_ack *extack) 1041 { 1042 gfp_t gfp_flags = can_block ? GFP_KERNEL : GFP_ATOMIC; 1043 int addr_type = ipv6_addr_type(cfg->pfx); 1044 struct net *net = dev_net(idev->dev); 1045 struct inet6_ifaddr *ifa = NULL; 1046 struct fib6_info *f6i = NULL; 1047 int err = 0; 1048 1049 if (addr_type == IPV6_ADDR_ANY || 1050 addr_type & IPV6_ADDR_MULTICAST || 1051 (!(idev->dev->flags & IFF_LOOPBACK) && 1052 !netif_is_l3_master(idev->dev) && 1053 addr_type & IPV6_ADDR_LOOPBACK)) 1054 return ERR_PTR(-EADDRNOTAVAIL); 1055 1056 if (idev->dead) { 1057 err = -ENODEV; /*XXX*/ 1058 goto out; 1059 } 1060 1061 if (idev->cnf.disable_ipv6) { 1062 err = -EACCES; 1063 goto out; 1064 } 1065 1066 /* validator notifier needs to be blocking; 1067 * do not call in atomic context 1068 */ 1069 if (can_block) { 1070 struct in6_validator_info i6vi = { 1071 .i6vi_addr = *cfg->pfx, 1072 .i6vi_dev = idev, 1073 .extack = extack, 1074 }; 1075 1076 err = inet6addr_validator_notifier_call_chain(NETDEV_UP, &i6vi); 1077 err = notifier_to_errno(err); 1078 if (err < 0) 1079 goto out; 1080 } 1081 1082 ifa = kzalloc(sizeof(*ifa), gfp_flags); 1083 if (!ifa) { 1084 err = -ENOBUFS; 1085 goto out; 1086 } 1087 1088 f6i = addrconf_f6i_alloc(net, idev, cfg->pfx, false, gfp_flags); 1089 if (IS_ERR(f6i)) { 1090 err = PTR_ERR(f6i); 1091 f6i = NULL; 1092 goto out; 1093 } 1094 1095 if (net->ipv6.devconf_all->disable_policy || 1096 idev->cnf.disable_policy) 1097 f6i->dst_nopolicy = true; 1098 1099 neigh_parms_data_state_setall(idev->nd_parms); 1100 1101 ifa->addr = *cfg->pfx; 1102 if (cfg->peer_pfx) 1103 ifa->peer_addr = *cfg->peer_pfx; 1104 1105 spin_lock_init(&ifa->lock); 1106 INIT_DELAYED_WORK(&ifa->dad_work, addrconf_dad_work); 1107 INIT_HLIST_NODE(&ifa->addr_lst); 1108 ifa->scope = cfg->scope; 1109 ifa->prefix_len = cfg->plen; 1110 ifa->rt_priority = cfg->rt_priority; 1111 ifa->flags = cfg->ifa_flags; 1112 /* No need to add the TENTATIVE flag for addresses with NODAD */ 1113 if (!(cfg->ifa_flags & IFA_F_NODAD)) 1114 ifa->flags |= IFA_F_TENTATIVE; 1115 ifa->valid_lft = cfg->valid_lft; 1116 ifa->prefered_lft = cfg->preferred_lft; 1117 ifa->cstamp = ifa->tstamp = jiffies; 1118 ifa->tokenized = false; 1119 1120 ifa->rt = f6i; 1121 1122 ifa->idev = idev; 1123 in6_dev_hold(idev); 1124 1125 /* For caller */ 1126 refcount_set(&ifa->refcnt, 1); 1127 1128 rcu_read_lock_bh(); 1129 1130 err = ipv6_add_addr_hash(idev->dev, ifa); 1131 if (err < 0) { 1132 rcu_read_unlock_bh(); 1133 goto out; 1134 } 1135 1136 write_lock(&idev->lock); 1137 1138 /* Add to inet6_dev unicast addr list. */ 1139 ipv6_link_dev_addr(idev, ifa); 1140 1141 if (ifa->flags&IFA_F_TEMPORARY) { 1142 list_add(&ifa->tmp_list, &idev->tempaddr_list); 1143 in6_ifa_hold(ifa); 1144 } 1145 1146 in6_ifa_hold(ifa); 1147 write_unlock(&idev->lock); 1148 1149 rcu_read_unlock_bh(); 1150 1151 inet6addr_notifier_call_chain(NETDEV_UP, ifa); 1152 out: 1153 if (unlikely(err < 0)) { 1154 fib6_info_release(f6i); 1155 1156 if (ifa) { 1157 if (ifa->idev) 1158 in6_dev_put(ifa->idev); 1159 kfree(ifa); 1160 } 1161 ifa = ERR_PTR(err); 1162 } 1163 1164 return ifa; 1165 } 1166 1167 enum cleanup_prefix_rt_t { 1168 CLEANUP_PREFIX_RT_NOP, /* no cleanup action for prefix route */ 1169 CLEANUP_PREFIX_RT_DEL, /* delete the prefix route */ 1170 CLEANUP_PREFIX_RT_EXPIRE, /* update the lifetime of the prefix route */ 1171 }; 1172 1173 /* 1174 * Check, whether the prefix for ifp would still need a prefix route 1175 * after deleting ifp. The function returns one of the CLEANUP_PREFIX_RT_* 1176 * constants. 1177 * 1178 * 1) we don't purge prefix if address was not permanent. 1179 * prefix is managed by its own lifetime. 1180 * 2) we also don't purge, if the address was IFA_F_NOPREFIXROUTE. 1181 * 3) if there are no addresses, delete prefix. 1182 * 4) if there are still other permanent address(es), 1183 * corresponding prefix is still permanent. 1184 * 5) if there are still other addresses with IFA_F_NOPREFIXROUTE, 1185 * don't purge the prefix, assume user space is managing it. 1186 * 6) otherwise, update prefix lifetime to the 1187 * longest valid lifetime among the corresponding 1188 * addresses on the device. 1189 * Note: subsequent RA will update lifetime. 1190 **/ 1191 static enum cleanup_prefix_rt_t 1192 check_cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long *expires) 1193 { 1194 struct inet6_ifaddr *ifa; 1195 struct inet6_dev *idev = ifp->idev; 1196 unsigned long lifetime; 1197 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_DEL; 1198 1199 *expires = jiffies; 1200 1201 list_for_each_entry(ifa, &idev->addr_list, if_list) { 1202 if (ifa == ifp) 1203 continue; 1204 if (ifa->prefix_len != ifp->prefix_len || 1205 !ipv6_prefix_equal(&ifa->addr, &ifp->addr, 1206 ifp->prefix_len)) 1207 continue; 1208 if (ifa->flags & (IFA_F_PERMANENT | IFA_F_NOPREFIXROUTE)) 1209 return CLEANUP_PREFIX_RT_NOP; 1210 1211 action = CLEANUP_PREFIX_RT_EXPIRE; 1212 1213 spin_lock(&ifa->lock); 1214 1215 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ); 1216 /* 1217 * Note: Because this address is 1218 * not permanent, lifetime < 1219 * LONG_MAX / HZ here. 1220 */ 1221 if (time_before(*expires, ifa->tstamp + lifetime * HZ)) 1222 *expires = ifa->tstamp + lifetime * HZ; 1223 spin_unlock(&ifa->lock); 1224 } 1225 1226 return action; 1227 } 1228 1229 static void 1230 cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long expires, bool del_rt) 1231 { 1232 struct fib6_info *f6i; 1233 1234 f6i = addrconf_get_prefix_route(&ifp->addr, ifp->prefix_len, 1235 ifp->idev->dev, 0, RTF_DEFAULT, true); 1236 if (f6i) { 1237 if (del_rt) 1238 ip6_del_rt(dev_net(ifp->idev->dev), f6i); 1239 else { 1240 if (!(f6i->fib6_flags & RTF_EXPIRES)) 1241 fib6_set_expires(f6i, expires); 1242 fib6_info_release(f6i); 1243 } 1244 } 1245 } 1246 1247 1248 /* This function wants to get referenced ifp and releases it before return */ 1249 1250 static void ipv6_del_addr(struct inet6_ifaddr *ifp) 1251 { 1252 int state; 1253 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_NOP; 1254 unsigned long expires; 1255 1256 ASSERT_RTNL(); 1257 1258 spin_lock_bh(&ifp->lock); 1259 state = ifp->state; 1260 ifp->state = INET6_IFADDR_STATE_DEAD; 1261 spin_unlock_bh(&ifp->lock); 1262 1263 if (state == INET6_IFADDR_STATE_DEAD) 1264 goto out; 1265 1266 spin_lock_bh(&addrconf_hash_lock); 1267 hlist_del_init_rcu(&ifp->addr_lst); 1268 spin_unlock_bh(&addrconf_hash_lock); 1269 1270 write_lock_bh(&ifp->idev->lock); 1271 1272 if (ifp->flags&IFA_F_TEMPORARY) { 1273 list_del(&ifp->tmp_list); 1274 if (ifp->ifpub) { 1275 in6_ifa_put(ifp->ifpub); 1276 ifp->ifpub = NULL; 1277 } 1278 __in6_ifa_put(ifp); 1279 } 1280 1281 if (ifp->flags & IFA_F_PERMANENT && !(ifp->flags & IFA_F_NOPREFIXROUTE)) 1282 action = check_cleanup_prefix_route(ifp, &expires); 1283 1284 list_del_rcu(&ifp->if_list); 1285 __in6_ifa_put(ifp); 1286 1287 write_unlock_bh(&ifp->idev->lock); 1288 1289 addrconf_del_dad_work(ifp); 1290 1291 ipv6_ifa_notify(RTM_DELADDR, ifp); 1292 1293 inet6addr_notifier_call_chain(NETDEV_DOWN, ifp); 1294 1295 if (action != CLEANUP_PREFIX_RT_NOP) { 1296 cleanup_prefix_route(ifp, expires, 1297 action == CLEANUP_PREFIX_RT_DEL); 1298 } 1299 1300 /* clean up prefsrc entries */ 1301 rt6_remove_prefsrc(ifp); 1302 out: 1303 in6_ifa_put(ifp); 1304 } 1305 1306 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, 1307 struct inet6_ifaddr *ift, 1308 bool block) 1309 { 1310 struct inet6_dev *idev = ifp->idev; 1311 struct in6_addr addr, *tmpaddr; 1312 unsigned long tmp_tstamp, age; 1313 unsigned long regen_advance; 1314 struct ifa6_config cfg; 1315 int ret = 0; 1316 unsigned long now = jiffies; 1317 long max_desync_factor; 1318 s32 cnf_temp_preferred_lft; 1319 1320 write_lock_bh(&idev->lock); 1321 if (ift) { 1322 spin_lock_bh(&ift->lock); 1323 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8); 1324 spin_unlock_bh(&ift->lock); 1325 tmpaddr = &addr; 1326 } else { 1327 tmpaddr = NULL; 1328 } 1329 retry: 1330 in6_dev_hold(idev); 1331 if (idev->cnf.use_tempaddr <= 0) { 1332 write_unlock_bh(&idev->lock); 1333 pr_info("%s: use_tempaddr is disabled\n", __func__); 1334 in6_dev_put(idev); 1335 ret = -1; 1336 goto out; 1337 } 1338 spin_lock_bh(&ifp->lock); 1339 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) { 1340 idev->cnf.use_tempaddr = -1; /*XXX*/ 1341 spin_unlock_bh(&ifp->lock); 1342 write_unlock_bh(&idev->lock); 1343 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n", 1344 __func__); 1345 in6_dev_put(idev); 1346 ret = -1; 1347 goto out; 1348 } 1349 in6_ifa_hold(ifp); 1350 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8); 1351 ipv6_try_regen_rndid(idev, tmpaddr); 1352 memcpy(&addr.s6_addr[8], idev->rndid, 8); 1353 age = (now - ifp->tstamp) / HZ; 1354 1355 regen_advance = idev->cnf.regen_max_retry * 1356 idev->cnf.dad_transmits * 1357 NEIGH_VAR(idev->nd_parms, RETRANS_TIME) / HZ; 1358 1359 /* recalculate max_desync_factor each time and update 1360 * idev->desync_factor if it's larger 1361 */ 1362 cnf_temp_preferred_lft = READ_ONCE(idev->cnf.temp_prefered_lft); 1363 max_desync_factor = min_t(__u32, 1364 idev->cnf.max_desync_factor, 1365 cnf_temp_preferred_lft - regen_advance); 1366 1367 if (unlikely(idev->desync_factor > max_desync_factor)) { 1368 if (max_desync_factor > 0) { 1369 get_random_bytes(&idev->desync_factor, 1370 sizeof(idev->desync_factor)); 1371 idev->desync_factor %= max_desync_factor; 1372 } else { 1373 idev->desync_factor = 0; 1374 } 1375 } 1376 1377 memset(&cfg, 0, sizeof(cfg)); 1378 cfg.valid_lft = min_t(__u32, ifp->valid_lft, 1379 idev->cnf.temp_valid_lft + age); 1380 cfg.preferred_lft = cnf_temp_preferred_lft + age - idev->desync_factor; 1381 cfg.preferred_lft = min_t(__u32, ifp->prefered_lft, cfg.preferred_lft); 1382 1383 cfg.plen = ifp->prefix_len; 1384 tmp_tstamp = ifp->tstamp; 1385 spin_unlock_bh(&ifp->lock); 1386 1387 write_unlock_bh(&idev->lock); 1388 1389 /* A temporary address is created only if this calculated Preferred 1390 * Lifetime is greater than REGEN_ADVANCE time units. In particular, 1391 * an implementation must not create a temporary address with a zero 1392 * Preferred Lifetime. 1393 * Use age calculation as in addrconf_verify to avoid unnecessary 1394 * temporary addresses being generated. 1395 */ 1396 age = (now - tmp_tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ; 1397 if (cfg.preferred_lft <= regen_advance + age) { 1398 in6_ifa_put(ifp); 1399 in6_dev_put(idev); 1400 ret = -1; 1401 goto out; 1402 } 1403 1404 cfg.ifa_flags = IFA_F_TEMPORARY; 1405 /* set in addrconf_prefix_rcv() */ 1406 if (ifp->flags & IFA_F_OPTIMISTIC) 1407 cfg.ifa_flags |= IFA_F_OPTIMISTIC; 1408 1409 cfg.pfx = &addr; 1410 cfg.scope = ipv6_addr_scope(cfg.pfx); 1411 1412 ift = ipv6_add_addr(idev, &cfg, block, NULL); 1413 if (IS_ERR(ift)) { 1414 in6_ifa_put(ifp); 1415 in6_dev_put(idev); 1416 pr_info("%s: retry temporary address regeneration\n", __func__); 1417 tmpaddr = &addr; 1418 write_lock_bh(&idev->lock); 1419 goto retry; 1420 } 1421 1422 spin_lock_bh(&ift->lock); 1423 ift->ifpub = ifp; 1424 ift->cstamp = now; 1425 ift->tstamp = tmp_tstamp; 1426 spin_unlock_bh(&ift->lock); 1427 1428 addrconf_dad_start(ift); 1429 in6_ifa_put(ift); 1430 in6_dev_put(idev); 1431 out: 1432 return ret; 1433 } 1434 1435 /* 1436 * Choose an appropriate source address (RFC3484) 1437 */ 1438 enum { 1439 IPV6_SADDR_RULE_INIT = 0, 1440 IPV6_SADDR_RULE_LOCAL, 1441 IPV6_SADDR_RULE_SCOPE, 1442 IPV6_SADDR_RULE_PREFERRED, 1443 #ifdef CONFIG_IPV6_MIP6 1444 IPV6_SADDR_RULE_HOA, 1445 #endif 1446 IPV6_SADDR_RULE_OIF, 1447 IPV6_SADDR_RULE_LABEL, 1448 IPV6_SADDR_RULE_PRIVACY, 1449 IPV6_SADDR_RULE_ORCHID, 1450 IPV6_SADDR_RULE_PREFIX, 1451 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1452 IPV6_SADDR_RULE_NOT_OPTIMISTIC, 1453 #endif 1454 IPV6_SADDR_RULE_MAX 1455 }; 1456 1457 struct ipv6_saddr_score { 1458 int rule; 1459 int addr_type; 1460 struct inet6_ifaddr *ifa; 1461 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX); 1462 int scopedist; 1463 int matchlen; 1464 }; 1465 1466 struct ipv6_saddr_dst { 1467 const struct in6_addr *addr; 1468 int ifindex; 1469 int scope; 1470 int label; 1471 unsigned int prefs; 1472 }; 1473 1474 static inline int ipv6_saddr_preferred(int type) 1475 { 1476 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK)) 1477 return 1; 1478 return 0; 1479 } 1480 1481 static bool ipv6_use_optimistic_addr(struct net *net, 1482 struct inet6_dev *idev) 1483 { 1484 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1485 if (!idev) 1486 return false; 1487 if (!net->ipv6.devconf_all->optimistic_dad && !idev->cnf.optimistic_dad) 1488 return false; 1489 if (!net->ipv6.devconf_all->use_optimistic && !idev->cnf.use_optimistic) 1490 return false; 1491 1492 return true; 1493 #else 1494 return false; 1495 #endif 1496 } 1497 1498 static bool ipv6_allow_optimistic_dad(struct net *net, 1499 struct inet6_dev *idev) 1500 { 1501 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1502 if (!idev) 1503 return false; 1504 if (!net->ipv6.devconf_all->optimistic_dad && !idev->cnf.optimistic_dad) 1505 return false; 1506 1507 return true; 1508 #else 1509 return false; 1510 #endif 1511 } 1512 1513 static int ipv6_get_saddr_eval(struct net *net, 1514 struct ipv6_saddr_score *score, 1515 struct ipv6_saddr_dst *dst, 1516 int i) 1517 { 1518 int ret; 1519 1520 if (i <= score->rule) { 1521 switch (i) { 1522 case IPV6_SADDR_RULE_SCOPE: 1523 ret = score->scopedist; 1524 break; 1525 case IPV6_SADDR_RULE_PREFIX: 1526 ret = score->matchlen; 1527 break; 1528 default: 1529 ret = !!test_bit(i, score->scorebits); 1530 } 1531 goto out; 1532 } 1533 1534 switch (i) { 1535 case IPV6_SADDR_RULE_INIT: 1536 /* Rule 0: remember if hiscore is not ready yet */ 1537 ret = !!score->ifa; 1538 break; 1539 case IPV6_SADDR_RULE_LOCAL: 1540 /* Rule 1: Prefer same address */ 1541 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr); 1542 break; 1543 case IPV6_SADDR_RULE_SCOPE: 1544 /* Rule 2: Prefer appropriate scope 1545 * 1546 * ret 1547 * ^ 1548 * -1 | d 15 1549 * ---+--+-+---> scope 1550 * | 1551 * | d is scope of the destination. 1552 * B-d | \ 1553 * | \ <- smaller scope is better if 1554 * B-15 | \ if scope is enough for destination. 1555 * | ret = B - scope (-1 <= scope >= d <= 15). 1556 * d-C-1 | / 1557 * |/ <- greater is better 1558 * -C / if scope is not enough for destination. 1559 * /| ret = scope - C (-1 <= d < scope <= 15). 1560 * 1561 * d - C - 1 < B -15 (for all -1 <= d <= 15). 1562 * C > d + 14 - B >= 15 + 14 - B = 29 - B. 1563 * Assume B = 0 and we get C > 29. 1564 */ 1565 ret = __ipv6_addr_src_scope(score->addr_type); 1566 if (ret >= dst->scope) 1567 ret = -ret; 1568 else 1569 ret -= 128; /* 30 is enough */ 1570 score->scopedist = ret; 1571 break; 1572 case IPV6_SADDR_RULE_PREFERRED: 1573 { 1574 /* Rule 3: Avoid deprecated and optimistic addresses */ 1575 u8 avoid = IFA_F_DEPRECATED; 1576 1577 if (!ipv6_use_optimistic_addr(net, score->ifa->idev)) 1578 avoid |= IFA_F_OPTIMISTIC; 1579 ret = ipv6_saddr_preferred(score->addr_type) || 1580 !(score->ifa->flags & avoid); 1581 break; 1582 } 1583 #ifdef CONFIG_IPV6_MIP6 1584 case IPV6_SADDR_RULE_HOA: 1585 { 1586 /* Rule 4: Prefer home address */ 1587 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA); 1588 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome; 1589 break; 1590 } 1591 #endif 1592 case IPV6_SADDR_RULE_OIF: 1593 /* Rule 5: Prefer outgoing interface */ 1594 ret = (!dst->ifindex || 1595 dst->ifindex == score->ifa->idev->dev->ifindex); 1596 break; 1597 case IPV6_SADDR_RULE_LABEL: 1598 /* Rule 6: Prefer matching label */ 1599 ret = ipv6_addr_label(net, 1600 &score->ifa->addr, score->addr_type, 1601 score->ifa->idev->dev->ifindex) == dst->label; 1602 break; 1603 case IPV6_SADDR_RULE_PRIVACY: 1604 { 1605 /* Rule 7: Prefer public address 1606 * Note: prefer temporary address if use_tempaddr >= 2 1607 */ 1608 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ? 1609 !!(dst->prefs & IPV6_PREFER_SRC_TMP) : 1610 score->ifa->idev->cnf.use_tempaddr >= 2; 1611 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp; 1612 break; 1613 } 1614 case IPV6_SADDR_RULE_ORCHID: 1615 /* Rule 8-: Prefer ORCHID vs ORCHID or 1616 * non-ORCHID vs non-ORCHID 1617 */ 1618 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^ 1619 ipv6_addr_orchid(dst->addr)); 1620 break; 1621 case IPV6_SADDR_RULE_PREFIX: 1622 /* Rule 8: Use longest matching prefix */ 1623 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr); 1624 if (ret > score->ifa->prefix_len) 1625 ret = score->ifa->prefix_len; 1626 score->matchlen = ret; 1627 break; 1628 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1629 case IPV6_SADDR_RULE_NOT_OPTIMISTIC: 1630 /* Optimistic addresses still have lower precedence than other 1631 * preferred addresses. 1632 */ 1633 ret = !(score->ifa->flags & IFA_F_OPTIMISTIC); 1634 break; 1635 #endif 1636 default: 1637 ret = 0; 1638 } 1639 1640 if (ret) 1641 __set_bit(i, score->scorebits); 1642 score->rule = i; 1643 out: 1644 return ret; 1645 } 1646 1647 static int __ipv6_dev_get_saddr(struct net *net, 1648 struct ipv6_saddr_dst *dst, 1649 struct inet6_dev *idev, 1650 struct ipv6_saddr_score *scores, 1651 int hiscore_idx) 1652 { 1653 struct ipv6_saddr_score *score = &scores[1 - hiscore_idx], *hiscore = &scores[hiscore_idx]; 1654 1655 list_for_each_entry_rcu(score->ifa, &idev->addr_list, if_list) { 1656 int i; 1657 1658 /* 1659 * - Tentative Address (RFC2462 section 5.4) 1660 * - A tentative address is not considered 1661 * "assigned to an interface" in the traditional 1662 * sense, unless it is also flagged as optimistic. 1663 * - Candidate Source Address (section 4) 1664 * - In any case, anycast addresses, multicast 1665 * addresses, and the unspecified address MUST 1666 * NOT be included in a candidate set. 1667 */ 1668 if ((score->ifa->flags & IFA_F_TENTATIVE) && 1669 (!(score->ifa->flags & IFA_F_OPTIMISTIC))) 1670 continue; 1671 1672 score->addr_type = __ipv6_addr_type(&score->ifa->addr); 1673 1674 if (unlikely(score->addr_type == IPV6_ADDR_ANY || 1675 score->addr_type & IPV6_ADDR_MULTICAST)) { 1676 net_dbg_ratelimited("ADDRCONF: unspecified / multicast address assigned as unicast address on %s", 1677 idev->dev->name); 1678 continue; 1679 } 1680 1681 score->rule = -1; 1682 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX); 1683 1684 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) { 1685 int minihiscore, miniscore; 1686 1687 minihiscore = ipv6_get_saddr_eval(net, hiscore, dst, i); 1688 miniscore = ipv6_get_saddr_eval(net, score, dst, i); 1689 1690 if (minihiscore > miniscore) { 1691 if (i == IPV6_SADDR_RULE_SCOPE && 1692 score->scopedist > 0) { 1693 /* 1694 * special case: 1695 * each remaining entry 1696 * has too small (not enough) 1697 * scope, because ifa entries 1698 * are sorted by their scope 1699 * values. 1700 */ 1701 goto out; 1702 } 1703 break; 1704 } else if (minihiscore < miniscore) { 1705 swap(hiscore, score); 1706 hiscore_idx = 1 - hiscore_idx; 1707 1708 /* restore our iterator */ 1709 score->ifa = hiscore->ifa; 1710 1711 break; 1712 } 1713 } 1714 } 1715 out: 1716 return hiscore_idx; 1717 } 1718 1719 static int ipv6_get_saddr_master(struct net *net, 1720 const struct net_device *dst_dev, 1721 const struct net_device *master, 1722 struct ipv6_saddr_dst *dst, 1723 struct ipv6_saddr_score *scores, 1724 int hiscore_idx) 1725 { 1726 struct inet6_dev *idev; 1727 1728 idev = __in6_dev_get(dst_dev); 1729 if (idev) 1730 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev, 1731 scores, hiscore_idx); 1732 1733 idev = __in6_dev_get(master); 1734 if (idev) 1735 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev, 1736 scores, hiscore_idx); 1737 1738 return hiscore_idx; 1739 } 1740 1741 int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev, 1742 const struct in6_addr *daddr, unsigned int prefs, 1743 struct in6_addr *saddr) 1744 { 1745 struct ipv6_saddr_score scores[2], *hiscore; 1746 struct ipv6_saddr_dst dst; 1747 struct inet6_dev *idev; 1748 struct net_device *dev; 1749 int dst_type; 1750 bool use_oif_addr = false; 1751 int hiscore_idx = 0; 1752 int ret = 0; 1753 1754 dst_type = __ipv6_addr_type(daddr); 1755 dst.addr = daddr; 1756 dst.ifindex = dst_dev ? dst_dev->ifindex : 0; 1757 dst.scope = __ipv6_addr_src_scope(dst_type); 1758 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex); 1759 dst.prefs = prefs; 1760 1761 scores[hiscore_idx].rule = -1; 1762 scores[hiscore_idx].ifa = NULL; 1763 1764 rcu_read_lock(); 1765 1766 /* Candidate Source Address (section 4) 1767 * - multicast and link-local destination address, 1768 * the set of candidate source address MUST only 1769 * include addresses assigned to interfaces 1770 * belonging to the same link as the outgoing 1771 * interface. 1772 * (- For site-local destination addresses, the 1773 * set of candidate source addresses MUST only 1774 * include addresses assigned to interfaces 1775 * belonging to the same site as the outgoing 1776 * interface.) 1777 * - "It is RECOMMENDED that the candidate source addresses 1778 * be the set of unicast addresses assigned to the 1779 * interface that will be used to send to the destination 1780 * (the 'outgoing' interface)." (RFC 6724) 1781 */ 1782 if (dst_dev) { 1783 idev = __in6_dev_get(dst_dev); 1784 if ((dst_type & IPV6_ADDR_MULTICAST) || 1785 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL || 1786 (idev && idev->cnf.use_oif_addrs_only)) { 1787 use_oif_addr = true; 1788 } 1789 } 1790 1791 if (use_oif_addr) { 1792 if (idev) 1793 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx); 1794 } else { 1795 const struct net_device *master; 1796 int master_idx = 0; 1797 1798 /* if dst_dev exists and is enslaved to an L3 device, then 1799 * prefer addresses from dst_dev and then the master over 1800 * any other enslaved devices in the L3 domain. 1801 */ 1802 master = l3mdev_master_dev_rcu(dst_dev); 1803 if (master) { 1804 master_idx = master->ifindex; 1805 1806 hiscore_idx = ipv6_get_saddr_master(net, dst_dev, 1807 master, &dst, 1808 scores, hiscore_idx); 1809 1810 if (scores[hiscore_idx].ifa) 1811 goto out; 1812 } 1813 1814 for_each_netdev_rcu(net, dev) { 1815 /* only consider addresses on devices in the 1816 * same L3 domain 1817 */ 1818 if (l3mdev_master_ifindex_rcu(dev) != master_idx) 1819 continue; 1820 idev = __in6_dev_get(dev); 1821 if (!idev) 1822 continue; 1823 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx); 1824 } 1825 } 1826 1827 out: 1828 hiscore = &scores[hiscore_idx]; 1829 if (!hiscore->ifa) 1830 ret = -EADDRNOTAVAIL; 1831 else 1832 *saddr = hiscore->ifa->addr; 1833 1834 rcu_read_unlock(); 1835 return ret; 1836 } 1837 EXPORT_SYMBOL(ipv6_dev_get_saddr); 1838 1839 int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr, 1840 u32 banned_flags) 1841 { 1842 struct inet6_ifaddr *ifp; 1843 int err = -EADDRNOTAVAIL; 1844 1845 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) { 1846 if (ifp->scope > IFA_LINK) 1847 break; 1848 if (ifp->scope == IFA_LINK && 1849 !(ifp->flags & banned_flags)) { 1850 *addr = ifp->addr; 1851 err = 0; 1852 break; 1853 } 1854 } 1855 return err; 1856 } 1857 1858 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr, 1859 u32 banned_flags) 1860 { 1861 struct inet6_dev *idev; 1862 int err = -EADDRNOTAVAIL; 1863 1864 rcu_read_lock(); 1865 idev = __in6_dev_get(dev); 1866 if (idev) { 1867 read_lock_bh(&idev->lock); 1868 err = __ipv6_get_lladdr(idev, addr, banned_flags); 1869 read_unlock_bh(&idev->lock); 1870 } 1871 rcu_read_unlock(); 1872 return err; 1873 } 1874 1875 static int ipv6_count_addresses(const struct inet6_dev *idev) 1876 { 1877 const struct inet6_ifaddr *ifp; 1878 int cnt = 0; 1879 1880 rcu_read_lock(); 1881 list_for_each_entry_rcu(ifp, &idev->addr_list, if_list) 1882 cnt++; 1883 rcu_read_unlock(); 1884 return cnt; 1885 } 1886 1887 int ipv6_chk_addr(struct net *net, const struct in6_addr *addr, 1888 const struct net_device *dev, int strict) 1889 { 1890 return ipv6_chk_addr_and_flags(net, addr, dev, !dev, 1891 strict, IFA_F_TENTATIVE); 1892 } 1893 EXPORT_SYMBOL(ipv6_chk_addr); 1894 1895 /* device argument is used to find the L3 domain of interest. If 1896 * skip_dev_check is set, then the ifp device is not checked against 1897 * the passed in dev argument. So the 2 cases for addresses checks are: 1898 * 1. does the address exist in the L3 domain that dev is part of 1899 * (skip_dev_check = true), or 1900 * 1901 * 2. does the address exist on the specific device 1902 * (skip_dev_check = false) 1903 */ 1904 int ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr, 1905 const struct net_device *dev, bool skip_dev_check, 1906 int strict, u32 banned_flags) 1907 { 1908 unsigned int hash = inet6_addr_hash(net, addr); 1909 const struct net_device *l3mdev; 1910 struct inet6_ifaddr *ifp; 1911 u32 ifp_flags; 1912 1913 rcu_read_lock(); 1914 1915 l3mdev = l3mdev_master_dev_rcu(dev); 1916 if (skip_dev_check) 1917 dev = NULL; 1918 1919 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) { 1920 if (!net_eq(dev_net(ifp->idev->dev), net)) 1921 continue; 1922 1923 if (l3mdev_master_dev_rcu(ifp->idev->dev) != l3mdev) 1924 continue; 1925 1926 /* Decouple optimistic from tentative for evaluation here. 1927 * Ban optimistic addresses explicitly, when required. 1928 */ 1929 ifp_flags = (ifp->flags&IFA_F_OPTIMISTIC) 1930 ? (ifp->flags&~IFA_F_TENTATIVE) 1931 : ifp->flags; 1932 if (ipv6_addr_equal(&ifp->addr, addr) && 1933 !(ifp_flags&banned_flags) && 1934 (!dev || ifp->idev->dev == dev || 1935 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) { 1936 rcu_read_unlock(); 1937 return 1; 1938 } 1939 } 1940 1941 rcu_read_unlock(); 1942 return 0; 1943 } 1944 EXPORT_SYMBOL(ipv6_chk_addr_and_flags); 1945 1946 1947 /* Compares an address/prefix_len with addresses on device @dev. 1948 * If one is found it returns true. 1949 */ 1950 bool ipv6_chk_custom_prefix(const struct in6_addr *addr, 1951 const unsigned int prefix_len, struct net_device *dev) 1952 { 1953 const struct inet6_ifaddr *ifa; 1954 const struct inet6_dev *idev; 1955 bool ret = false; 1956 1957 rcu_read_lock(); 1958 idev = __in6_dev_get(dev); 1959 if (idev) { 1960 list_for_each_entry_rcu(ifa, &idev->addr_list, if_list) { 1961 ret = ipv6_prefix_equal(addr, &ifa->addr, prefix_len); 1962 if (ret) 1963 break; 1964 } 1965 } 1966 rcu_read_unlock(); 1967 1968 return ret; 1969 } 1970 EXPORT_SYMBOL(ipv6_chk_custom_prefix); 1971 1972 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev) 1973 { 1974 const struct inet6_ifaddr *ifa; 1975 const struct inet6_dev *idev; 1976 int onlink; 1977 1978 onlink = 0; 1979 rcu_read_lock(); 1980 idev = __in6_dev_get(dev); 1981 if (idev) { 1982 list_for_each_entry_rcu(ifa, &idev->addr_list, if_list) { 1983 onlink = ipv6_prefix_equal(addr, &ifa->addr, 1984 ifa->prefix_len); 1985 if (onlink) 1986 break; 1987 } 1988 } 1989 rcu_read_unlock(); 1990 return onlink; 1991 } 1992 EXPORT_SYMBOL(ipv6_chk_prefix); 1993 1994 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr, 1995 struct net_device *dev, int strict) 1996 { 1997 unsigned int hash = inet6_addr_hash(net, addr); 1998 struct inet6_ifaddr *ifp, *result = NULL; 1999 2000 rcu_read_lock(); 2001 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) { 2002 if (!net_eq(dev_net(ifp->idev->dev), net)) 2003 continue; 2004 if (ipv6_addr_equal(&ifp->addr, addr)) { 2005 if (!dev || ifp->idev->dev == dev || 2006 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) { 2007 result = ifp; 2008 in6_ifa_hold(ifp); 2009 break; 2010 } 2011 } 2012 } 2013 rcu_read_unlock(); 2014 2015 return result; 2016 } 2017 2018 /* Gets referenced address, destroys ifaddr */ 2019 2020 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed) 2021 { 2022 if (dad_failed) 2023 ifp->flags |= IFA_F_DADFAILED; 2024 2025 if (ifp->flags&IFA_F_TEMPORARY) { 2026 struct inet6_ifaddr *ifpub; 2027 spin_lock_bh(&ifp->lock); 2028 ifpub = ifp->ifpub; 2029 if (ifpub) { 2030 in6_ifa_hold(ifpub); 2031 spin_unlock_bh(&ifp->lock); 2032 ipv6_create_tempaddr(ifpub, ifp, true); 2033 in6_ifa_put(ifpub); 2034 } else { 2035 spin_unlock_bh(&ifp->lock); 2036 } 2037 ipv6_del_addr(ifp); 2038 } else if (ifp->flags&IFA_F_PERMANENT || !dad_failed) { 2039 spin_lock_bh(&ifp->lock); 2040 addrconf_del_dad_work(ifp); 2041 ifp->flags |= IFA_F_TENTATIVE; 2042 if (dad_failed) 2043 ifp->flags &= ~IFA_F_OPTIMISTIC; 2044 spin_unlock_bh(&ifp->lock); 2045 if (dad_failed) 2046 ipv6_ifa_notify(0, ifp); 2047 in6_ifa_put(ifp); 2048 } else { 2049 ipv6_del_addr(ifp); 2050 } 2051 } 2052 2053 static int addrconf_dad_end(struct inet6_ifaddr *ifp) 2054 { 2055 int err = -ENOENT; 2056 2057 spin_lock_bh(&ifp->lock); 2058 if (ifp->state == INET6_IFADDR_STATE_DAD) { 2059 ifp->state = INET6_IFADDR_STATE_POSTDAD; 2060 err = 0; 2061 } 2062 spin_unlock_bh(&ifp->lock); 2063 2064 return err; 2065 } 2066 2067 void addrconf_dad_failure(struct sk_buff *skb, struct inet6_ifaddr *ifp) 2068 { 2069 struct inet6_dev *idev = ifp->idev; 2070 struct net *net = dev_net(ifp->idev->dev); 2071 2072 if (addrconf_dad_end(ifp)) { 2073 in6_ifa_put(ifp); 2074 return; 2075 } 2076 2077 net_info_ratelimited("%s: IPv6 duplicate address %pI6c used by %pM detected!\n", 2078 ifp->idev->dev->name, &ifp->addr, eth_hdr(skb)->h_source); 2079 2080 spin_lock_bh(&ifp->lock); 2081 2082 if (ifp->flags & IFA_F_STABLE_PRIVACY) { 2083 struct in6_addr new_addr; 2084 struct inet6_ifaddr *ifp2; 2085 int retries = ifp->stable_privacy_retry + 1; 2086 struct ifa6_config cfg = { 2087 .pfx = &new_addr, 2088 .plen = ifp->prefix_len, 2089 .ifa_flags = ifp->flags, 2090 .valid_lft = ifp->valid_lft, 2091 .preferred_lft = ifp->prefered_lft, 2092 .scope = ifp->scope, 2093 }; 2094 2095 if (retries > net->ipv6.sysctl.idgen_retries) { 2096 net_info_ratelimited("%s: privacy stable address generation failed because of DAD conflicts!\n", 2097 ifp->idev->dev->name); 2098 goto errdad; 2099 } 2100 2101 new_addr = ifp->addr; 2102 if (ipv6_generate_stable_address(&new_addr, retries, 2103 idev)) 2104 goto errdad; 2105 2106 spin_unlock_bh(&ifp->lock); 2107 2108 if (idev->cnf.max_addresses && 2109 ipv6_count_addresses(idev) >= 2110 idev->cnf.max_addresses) 2111 goto lock_errdad; 2112 2113 net_info_ratelimited("%s: generating new stable privacy address because of DAD conflict\n", 2114 ifp->idev->dev->name); 2115 2116 ifp2 = ipv6_add_addr(idev, &cfg, false, NULL); 2117 if (IS_ERR(ifp2)) 2118 goto lock_errdad; 2119 2120 spin_lock_bh(&ifp2->lock); 2121 ifp2->stable_privacy_retry = retries; 2122 ifp2->state = INET6_IFADDR_STATE_PREDAD; 2123 spin_unlock_bh(&ifp2->lock); 2124 2125 addrconf_mod_dad_work(ifp2, net->ipv6.sysctl.idgen_delay); 2126 in6_ifa_put(ifp2); 2127 lock_errdad: 2128 spin_lock_bh(&ifp->lock); 2129 } 2130 2131 errdad: 2132 /* transition from _POSTDAD to _ERRDAD */ 2133 ifp->state = INET6_IFADDR_STATE_ERRDAD; 2134 spin_unlock_bh(&ifp->lock); 2135 2136 addrconf_mod_dad_work(ifp, 0); 2137 in6_ifa_put(ifp); 2138 } 2139 2140 /* Join to solicited addr multicast group. 2141 * caller must hold RTNL */ 2142 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr) 2143 { 2144 struct in6_addr maddr; 2145 2146 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP)) 2147 return; 2148 2149 addrconf_addr_solict_mult(addr, &maddr); 2150 ipv6_dev_mc_inc(dev, &maddr); 2151 } 2152 2153 /* caller must hold RTNL */ 2154 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr) 2155 { 2156 struct in6_addr maddr; 2157 2158 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP)) 2159 return; 2160 2161 addrconf_addr_solict_mult(addr, &maddr); 2162 __ipv6_dev_mc_dec(idev, &maddr); 2163 } 2164 2165 /* caller must hold RTNL */ 2166 static void addrconf_join_anycast(struct inet6_ifaddr *ifp) 2167 { 2168 struct in6_addr addr; 2169 2170 if (ifp->prefix_len >= 127) /* RFC 6164 */ 2171 return; 2172 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len); 2173 if (ipv6_addr_any(&addr)) 2174 return; 2175 __ipv6_dev_ac_inc(ifp->idev, &addr); 2176 } 2177 2178 /* caller must hold RTNL */ 2179 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp) 2180 { 2181 struct in6_addr addr; 2182 2183 if (ifp->prefix_len >= 127) /* RFC 6164 */ 2184 return; 2185 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len); 2186 if (ipv6_addr_any(&addr)) 2187 return; 2188 __ipv6_dev_ac_dec(ifp->idev, &addr); 2189 } 2190 2191 static int addrconf_ifid_6lowpan(u8 *eui, struct net_device *dev) 2192 { 2193 switch (dev->addr_len) { 2194 case ETH_ALEN: 2195 memcpy(eui, dev->dev_addr, 3); 2196 eui[3] = 0xFF; 2197 eui[4] = 0xFE; 2198 memcpy(eui + 5, dev->dev_addr + 3, 3); 2199 break; 2200 case EUI64_ADDR_LEN: 2201 memcpy(eui, dev->dev_addr, EUI64_ADDR_LEN); 2202 eui[0] ^= 2; 2203 break; 2204 default: 2205 return -1; 2206 } 2207 2208 return 0; 2209 } 2210 2211 static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev) 2212 { 2213 union fwnet_hwaddr *ha; 2214 2215 if (dev->addr_len != FWNET_ALEN) 2216 return -1; 2217 2218 ha = (union fwnet_hwaddr *)dev->dev_addr; 2219 2220 memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id)); 2221 eui[0] ^= 2; 2222 return 0; 2223 } 2224 2225 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev) 2226 { 2227 /* XXX: inherit EUI-64 from other interface -- yoshfuji */ 2228 if (dev->addr_len != ARCNET_ALEN) 2229 return -1; 2230 memset(eui, 0, 7); 2231 eui[7] = *(u8 *)dev->dev_addr; 2232 return 0; 2233 } 2234 2235 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev) 2236 { 2237 if (dev->addr_len != INFINIBAND_ALEN) 2238 return -1; 2239 memcpy(eui, dev->dev_addr + 12, 8); 2240 eui[0] |= 2; 2241 return 0; 2242 } 2243 2244 static int __ipv6_isatap_ifid(u8 *eui, __be32 addr) 2245 { 2246 if (addr == 0) 2247 return -1; 2248 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) || 2249 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) || 2250 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) || 2251 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) || 2252 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) || 2253 ipv4_is_lbcast(addr)) ? 0x00 : 0x02; 2254 eui[1] = 0; 2255 eui[2] = 0x5E; 2256 eui[3] = 0xFE; 2257 memcpy(eui + 4, &addr, 4); 2258 return 0; 2259 } 2260 2261 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev) 2262 { 2263 if (dev->priv_flags & IFF_ISATAP) 2264 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr); 2265 return -1; 2266 } 2267 2268 static int addrconf_ifid_gre(u8 *eui, struct net_device *dev) 2269 { 2270 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr); 2271 } 2272 2273 static int addrconf_ifid_ip6tnl(u8 *eui, struct net_device *dev) 2274 { 2275 memcpy(eui, dev->perm_addr, 3); 2276 memcpy(eui + 5, dev->perm_addr + 3, 3); 2277 eui[3] = 0xFF; 2278 eui[4] = 0xFE; 2279 eui[0] ^= 2; 2280 return 0; 2281 } 2282 2283 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev) 2284 { 2285 switch (dev->type) { 2286 case ARPHRD_ETHER: 2287 case ARPHRD_FDDI: 2288 return addrconf_ifid_eui48(eui, dev); 2289 case ARPHRD_ARCNET: 2290 return addrconf_ifid_arcnet(eui, dev); 2291 case ARPHRD_INFINIBAND: 2292 return addrconf_ifid_infiniband(eui, dev); 2293 case ARPHRD_SIT: 2294 return addrconf_ifid_sit(eui, dev); 2295 case ARPHRD_IPGRE: 2296 case ARPHRD_TUNNEL: 2297 return addrconf_ifid_gre(eui, dev); 2298 case ARPHRD_6LOWPAN: 2299 return addrconf_ifid_6lowpan(eui, dev); 2300 case ARPHRD_IEEE1394: 2301 return addrconf_ifid_ieee1394(eui, dev); 2302 case ARPHRD_TUNNEL6: 2303 case ARPHRD_IP6GRE: 2304 case ARPHRD_RAWIP: 2305 return addrconf_ifid_ip6tnl(eui, dev); 2306 } 2307 return -1; 2308 } 2309 2310 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev) 2311 { 2312 int err = -1; 2313 struct inet6_ifaddr *ifp; 2314 2315 read_lock_bh(&idev->lock); 2316 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) { 2317 if (ifp->scope > IFA_LINK) 2318 break; 2319 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) { 2320 memcpy(eui, ifp->addr.s6_addr+8, 8); 2321 err = 0; 2322 break; 2323 } 2324 } 2325 read_unlock_bh(&idev->lock); 2326 return err; 2327 } 2328 2329 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */ 2330 static void ipv6_regen_rndid(struct inet6_dev *idev) 2331 { 2332 regen: 2333 get_random_bytes(idev->rndid, sizeof(idev->rndid)); 2334 idev->rndid[0] &= ~0x02; 2335 2336 /* 2337 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>: 2338 * check if generated address is not inappropriate 2339 * 2340 * - Reserved subnet anycast (RFC 2526) 2341 * 11111101 11....11 1xxxxxxx 2342 * - ISATAP (RFC4214) 6.1 2343 * 00-00-5E-FE-xx-xx-xx-xx 2344 * - value 0 2345 * - XXX: already assigned to an address on the device 2346 */ 2347 if (idev->rndid[0] == 0xfd && 2348 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff && 2349 (idev->rndid[7]&0x80)) 2350 goto regen; 2351 if ((idev->rndid[0]|idev->rndid[1]) == 0) { 2352 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe) 2353 goto regen; 2354 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00) 2355 goto regen; 2356 } 2357 } 2358 2359 static void ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) 2360 { 2361 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0) 2362 ipv6_regen_rndid(idev); 2363 } 2364 2365 /* 2366 * Add prefix route. 2367 */ 2368 2369 static void 2370 addrconf_prefix_route(struct in6_addr *pfx, int plen, u32 metric, 2371 struct net_device *dev, unsigned long expires, 2372 u32 flags, gfp_t gfp_flags) 2373 { 2374 struct fib6_config cfg = { 2375 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX, 2376 .fc_metric = metric ? : IP6_RT_PRIO_ADDRCONF, 2377 .fc_ifindex = dev->ifindex, 2378 .fc_expires = expires, 2379 .fc_dst_len = plen, 2380 .fc_flags = RTF_UP | flags, 2381 .fc_nlinfo.nl_net = dev_net(dev), 2382 .fc_protocol = RTPROT_KERNEL, 2383 .fc_type = RTN_UNICAST, 2384 }; 2385 2386 cfg.fc_dst = *pfx; 2387 2388 /* Prevent useless cloning on PtP SIT. 2389 This thing is done here expecting that the whole 2390 class of non-broadcast devices need not cloning. 2391 */ 2392 #if IS_ENABLED(CONFIG_IPV6_SIT) 2393 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT)) 2394 cfg.fc_flags |= RTF_NONEXTHOP; 2395 #endif 2396 2397 ip6_route_add(&cfg, gfp_flags, NULL); 2398 } 2399 2400 2401 static struct fib6_info *addrconf_get_prefix_route(const struct in6_addr *pfx, 2402 int plen, 2403 const struct net_device *dev, 2404 u32 flags, u32 noflags, 2405 bool no_gw) 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.fib_nh_dev->ifindex != dev->ifindex) 2423 continue; 2424 if (no_gw && rt->fib6_nh.fib_nh_gw_family) 2425 continue; 2426 if ((rt->fib6_flags & flags) != flags) 2427 continue; 2428 if ((rt->fib6_flags & noflags) != 0) 2429 continue; 2430 if (!fib6_info_hold_safe(rt)) 2431 continue; 2432 break; 2433 } 2434 out: 2435 rcu_read_unlock(); 2436 return rt; 2437 } 2438 2439 2440 /* Create "default" multicast route to the interface */ 2441 2442 static void addrconf_add_mroute(struct net_device *dev) 2443 { 2444 struct fib6_config cfg = { 2445 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_LOCAL, 2446 .fc_metric = IP6_RT_PRIO_ADDRCONF, 2447 .fc_ifindex = dev->ifindex, 2448 .fc_dst_len = 8, 2449 .fc_flags = RTF_UP, 2450 .fc_type = RTN_UNICAST, 2451 .fc_nlinfo.nl_net = dev_net(dev), 2452 }; 2453 2454 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0); 2455 2456 ip6_route_add(&cfg, GFP_KERNEL, NULL); 2457 } 2458 2459 static struct inet6_dev *addrconf_add_dev(struct net_device *dev) 2460 { 2461 struct inet6_dev *idev; 2462 2463 ASSERT_RTNL(); 2464 2465 idev = ipv6_find_idev(dev); 2466 if (!idev) 2467 return ERR_PTR(-ENOBUFS); 2468 2469 if (idev->cnf.disable_ipv6) 2470 return ERR_PTR(-EACCES); 2471 2472 /* Add default multicast route */ 2473 if (!(dev->flags & IFF_LOOPBACK) && !netif_is_l3_master(dev)) 2474 addrconf_add_mroute(dev); 2475 2476 return idev; 2477 } 2478 2479 static void manage_tempaddrs(struct inet6_dev *idev, 2480 struct inet6_ifaddr *ifp, 2481 __u32 valid_lft, __u32 prefered_lft, 2482 bool create, unsigned long now) 2483 { 2484 u32 flags; 2485 struct inet6_ifaddr *ift; 2486 2487 read_lock_bh(&idev->lock); 2488 /* update all temporary addresses in the list */ 2489 list_for_each_entry(ift, &idev->tempaddr_list, tmp_list) { 2490 int age, max_valid, max_prefered; 2491 2492 if (ifp != ift->ifpub) 2493 continue; 2494 2495 /* RFC 4941 section 3.3: 2496 * If a received option will extend the lifetime of a public 2497 * address, the lifetimes of temporary addresses should 2498 * be extended, subject to the overall constraint that no 2499 * temporary addresses should ever remain "valid" or "preferred" 2500 * for a time longer than (TEMP_VALID_LIFETIME) or 2501 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), respectively. 2502 */ 2503 age = (now - ift->cstamp) / HZ; 2504 max_valid = idev->cnf.temp_valid_lft - age; 2505 if (max_valid < 0) 2506 max_valid = 0; 2507 2508 max_prefered = idev->cnf.temp_prefered_lft - 2509 idev->desync_factor - age; 2510 if (max_prefered < 0) 2511 max_prefered = 0; 2512 2513 if (valid_lft > max_valid) 2514 valid_lft = max_valid; 2515 2516 if (prefered_lft > max_prefered) 2517 prefered_lft = max_prefered; 2518 2519 spin_lock(&ift->lock); 2520 flags = ift->flags; 2521 ift->valid_lft = valid_lft; 2522 ift->prefered_lft = prefered_lft; 2523 ift->tstamp = now; 2524 if (prefered_lft > 0) 2525 ift->flags &= ~IFA_F_DEPRECATED; 2526 2527 spin_unlock(&ift->lock); 2528 if (!(flags&IFA_F_TENTATIVE)) 2529 ipv6_ifa_notify(0, ift); 2530 } 2531 2532 if ((create || list_empty(&idev->tempaddr_list)) && 2533 idev->cnf.use_tempaddr > 0) { 2534 /* When a new public address is created as described 2535 * in [ADDRCONF], also create a new temporary address. 2536 * Also create a temporary address if it's enabled but 2537 * no temporary address currently exists. 2538 */ 2539 read_unlock_bh(&idev->lock); 2540 ipv6_create_tempaddr(ifp, NULL, false); 2541 } else { 2542 read_unlock_bh(&idev->lock); 2543 } 2544 } 2545 2546 static bool is_addr_mode_generate_stable(struct inet6_dev *idev) 2547 { 2548 return idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY || 2549 idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_RANDOM; 2550 } 2551 2552 int addrconf_prefix_rcv_add_addr(struct net *net, struct net_device *dev, 2553 const struct prefix_info *pinfo, 2554 struct inet6_dev *in6_dev, 2555 const struct in6_addr *addr, int addr_type, 2556 u32 addr_flags, bool sllao, bool tokenized, 2557 __u32 valid_lft, u32 prefered_lft) 2558 { 2559 struct inet6_ifaddr *ifp = ipv6_get_ifaddr(net, addr, dev, 1); 2560 int create = 0, update_lft = 0; 2561 2562 if (!ifp && valid_lft) { 2563 int max_addresses = in6_dev->cnf.max_addresses; 2564 struct ifa6_config cfg = { 2565 .pfx = addr, 2566 .plen = pinfo->prefix_len, 2567 .ifa_flags = addr_flags, 2568 .valid_lft = valid_lft, 2569 .preferred_lft = prefered_lft, 2570 .scope = addr_type & IPV6_ADDR_SCOPE_MASK, 2571 }; 2572 2573 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 2574 if ((net->ipv6.devconf_all->optimistic_dad || 2575 in6_dev->cnf.optimistic_dad) && 2576 !net->ipv6.devconf_all->forwarding && sllao) 2577 cfg.ifa_flags |= IFA_F_OPTIMISTIC; 2578 #endif 2579 2580 /* Do not allow to create too much of autoconfigured 2581 * addresses; this would be too easy way to crash kernel. 2582 */ 2583 if (!max_addresses || 2584 ipv6_count_addresses(in6_dev) < max_addresses) 2585 ifp = ipv6_add_addr(in6_dev, &cfg, false, NULL); 2586 2587 if (IS_ERR_OR_NULL(ifp)) 2588 return -1; 2589 2590 create = 1; 2591 spin_lock_bh(&ifp->lock); 2592 ifp->flags |= IFA_F_MANAGETEMPADDR; 2593 ifp->cstamp = jiffies; 2594 ifp->tokenized = tokenized; 2595 spin_unlock_bh(&ifp->lock); 2596 addrconf_dad_start(ifp); 2597 } 2598 2599 if (ifp) { 2600 u32 flags; 2601 unsigned long now; 2602 u32 stored_lft; 2603 2604 /* update lifetime (RFC2462 5.5.3 e) */ 2605 spin_lock_bh(&ifp->lock); 2606 now = jiffies; 2607 if (ifp->valid_lft > (now - ifp->tstamp) / HZ) 2608 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ; 2609 else 2610 stored_lft = 0; 2611 if (!create && stored_lft) { 2612 const u32 minimum_lft = min_t(u32, 2613 stored_lft, MIN_VALID_LIFETIME); 2614 valid_lft = max(valid_lft, minimum_lft); 2615 2616 /* RFC4862 Section 5.5.3e: 2617 * "Note that the preferred lifetime of the 2618 * corresponding address is always reset to 2619 * the Preferred Lifetime in the received 2620 * Prefix Information option, regardless of 2621 * whether the valid lifetime is also reset or 2622 * ignored." 2623 * 2624 * So we should always update prefered_lft here. 2625 */ 2626 update_lft = 1; 2627 } 2628 2629 if (update_lft) { 2630 ifp->valid_lft = valid_lft; 2631 ifp->prefered_lft = prefered_lft; 2632 ifp->tstamp = now; 2633 flags = ifp->flags; 2634 ifp->flags &= ~IFA_F_DEPRECATED; 2635 spin_unlock_bh(&ifp->lock); 2636 2637 if (!(flags&IFA_F_TENTATIVE)) 2638 ipv6_ifa_notify(0, ifp); 2639 } else 2640 spin_unlock_bh(&ifp->lock); 2641 2642 manage_tempaddrs(in6_dev, ifp, valid_lft, prefered_lft, 2643 create, now); 2644 2645 in6_ifa_put(ifp); 2646 addrconf_verify(); 2647 } 2648 2649 return 0; 2650 } 2651 EXPORT_SYMBOL_GPL(addrconf_prefix_rcv_add_addr); 2652 2653 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao) 2654 { 2655 struct prefix_info *pinfo; 2656 __u32 valid_lft; 2657 __u32 prefered_lft; 2658 int addr_type, err; 2659 u32 addr_flags = 0; 2660 struct inet6_dev *in6_dev; 2661 struct net *net = dev_net(dev); 2662 2663 pinfo = (struct prefix_info *) opt; 2664 2665 if (len < sizeof(struct prefix_info)) { 2666 netdev_dbg(dev, "addrconf: prefix option too short\n"); 2667 return; 2668 } 2669 2670 /* 2671 * Validation checks ([ADDRCONF], page 19) 2672 */ 2673 2674 addr_type = ipv6_addr_type(&pinfo->prefix); 2675 2676 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL)) 2677 return; 2678 2679 valid_lft = ntohl(pinfo->valid); 2680 prefered_lft = ntohl(pinfo->prefered); 2681 2682 if (prefered_lft > valid_lft) { 2683 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n"); 2684 return; 2685 } 2686 2687 in6_dev = in6_dev_get(dev); 2688 2689 if (!in6_dev) { 2690 net_dbg_ratelimited("addrconf: device %s not configured\n", 2691 dev->name); 2692 return; 2693 } 2694 2695 /* 2696 * Two things going on here: 2697 * 1) Add routes for on-link prefixes 2698 * 2) Configure prefixes with the auto flag set 2699 */ 2700 2701 if (pinfo->onlink) { 2702 struct fib6_info *rt; 2703 unsigned long rt_expires; 2704 2705 /* Avoid arithmetic overflow. Really, we could 2706 * save rt_expires in seconds, likely valid_lft, 2707 * but it would require division in fib gc, that it 2708 * not good. 2709 */ 2710 if (HZ > USER_HZ) 2711 rt_expires = addrconf_timeout_fixup(valid_lft, HZ); 2712 else 2713 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ); 2714 2715 if (addrconf_finite_timeout(rt_expires)) 2716 rt_expires *= HZ; 2717 2718 rt = addrconf_get_prefix_route(&pinfo->prefix, 2719 pinfo->prefix_len, 2720 dev, 2721 RTF_ADDRCONF | RTF_PREFIX_RT, 2722 RTF_DEFAULT, true); 2723 2724 if (rt) { 2725 /* Autoconf prefix route */ 2726 if (valid_lft == 0) { 2727 ip6_del_rt(net, rt); 2728 rt = NULL; 2729 } else if (addrconf_finite_timeout(rt_expires)) { 2730 /* not infinity */ 2731 fib6_set_expires(rt, jiffies + rt_expires); 2732 } else { 2733 fib6_clean_expires(rt); 2734 } 2735 } else if (valid_lft) { 2736 clock_t expires = 0; 2737 int flags = RTF_ADDRCONF | RTF_PREFIX_RT; 2738 if (addrconf_finite_timeout(rt_expires)) { 2739 /* not infinity */ 2740 flags |= RTF_EXPIRES; 2741 expires = jiffies_to_clock_t(rt_expires); 2742 } 2743 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len, 2744 0, dev, expires, flags, 2745 GFP_ATOMIC); 2746 } 2747 fib6_info_release(rt); 2748 } 2749 2750 /* Try to figure out our local address for this prefix */ 2751 2752 if (pinfo->autoconf && in6_dev->cnf.autoconf) { 2753 struct in6_addr addr; 2754 bool tokenized = false, dev_addr_generated = false; 2755 2756 if (pinfo->prefix_len == 64) { 2757 memcpy(&addr, &pinfo->prefix, 8); 2758 2759 if (!ipv6_addr_any(&in6_dev->token)) { 2760 read_lock_bh(&in6_dev->lock); 2761 memcpy(addr.s6_addr + 8, 2762 in6_dev->token.s6_addr + 8, 8); 2763 read_unlock_bh(&in6_dev->lock); 2764 tokenized = true; 2765 } else if (is_addr_mode_generate_stable(in6_dev) && 2766 !ipv6_generate_stable_address(&addr, 0, 2767 in6_dev)) { 2768 addr_flags |= IFA_F_STABLE_PRIVACY; 2769 goto ok; 2770 } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) && 2771 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) { 2772 goto put; 2773 } else { 2774 dev_addr_generated = true; 2775 } 2776 goto ok; 2777 } 2778 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n", 2779 pinfo->prefix_len); 2780 goto put; 2781 2782 ok: 2783 err = addrconf_prefix_rcv_add_addr(net, dev, pinfo, in6_dev, 2784 &addr, addr_type, 2785 addr_flags, sllao, 2786 tokenized, valid_lft, 2787 prefered_lft); 2788 if (err) 2789 goto put; 2790 2791 /* Ignore error case here because previous prefix add addr was 2792 * successful which will be notified. 2793 */ 2794 ndisc_ops_prefix_rcv_add_addr(net, dev, pinfo, in6_dev, &addr, 2795 addr_type, addr_flags, sllao, 2796 tokenized, valid_lft, 2797 prefered_lft, 2798 dev_addr_generated); 2799 } 2800 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo); 2801 put: 2802 in6_dev_put(in6_dev); 2803 } 2804 2805 /* 2806 * Set destination address. 2807 * Special case for SIT interfaces where we create a new "virtual" 2808 * device. 2809 */ 2810 int addrconf_set_dstaddr(struct net *net, void __user *arg) 2811 { 2812 struct in6_ifreq ireq; 2813 struct net_device *dev; 2814 int err = -EINVAL; 2815 2816 rtnl_lock(); 2817 2818 err = -EFAULT; 2819 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2820 goto err_exit; 2821 2822 dev = __dev_get_by_index(net, ireq.ifr6_ifindex); 2823 2824 err = -ENODEV; 2825 if (!dev) 2826 goto err_exit; 2827 2828 #if IS_ENABLED(CONFIG_IPV6_SIT) 2829 if (dev->type == ARPHRD_SIT) { 2830 const struct net_device_ops *ops = dev->netdev_ops; 2831 struct ifreq ifr; 2832 struct ip_tunnel_parm p; 2833 2834 err = -EADDRNOTAVAIL; 2835 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4)) 2836 goto err_exit; 2837 2838 memset(&p, 0, sizeof(p)); 2839 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3]; 2840 p.iph.saddr = 0; 2841 p.iph.version = 4; 2842 p.iph.ihl = 5; 2843 p.iph.protocol = IPPROTO_IPV6; 2844 p.iph.ttl = 64; 2845 ifr.ifr_ifru.ifru_data = (__force void __user *)&p; 2846 2847 if (ops->ndo_do_ioctl) { 2848 mm_segment_t oldfs = get_fs(); 2849 2850 set_fs(KERNEL_DS); 2851 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL); 2852 set_fs(oldfs); 2853 } else 2854 err = -EOPNOTSUPP; 2855 2856 if (err == 0) { 2857 err = -ENOBUFS; 2858 dev = __dev_get_by_name(net, p.name); 2859 if (!dev) 2860 goto err_exit; 2861 err = dev_open(dev, NULL); 2862 } 2863 } 2864 #endif 2865 2866 err_exit: 2867 rtnl_unlock(); 2868 return err; 2869 } 2870 2871 static int ipv6_mc_config(struct sock *sk, bool join, 2872 const struct in6_addr *addr, int ifindex) 2873 { 2874 int ret; 2875 2876 ASSERT_RTNL(); 2877 2878 lock_sock(sk); 2879 if (join) 2880 ret = ipv6_sock_mc_join(sk, ifindex, addr); 2881 else 2882 ret = ipv6_sock_mc_drop(sk, ifindex, addr); 2883 release_sock(sk); 2884 2885 return ret; 2886 } 2887 2888 /* 2889 * Manual configuration of address on an interface 2890 */ 2891 static int inet6_addr_add(struct net *net, int ifindex, 2892 struct ifa6_config *cfg, 2893 struct netlink_ext_ack *extack) 2894 { 2895 struct inet6_ifaddr *ifp; 2896 struct inet6_dev *idev; 2897 struct net_device *dev; 2898 unsigned long timeout; 2899 clock_t expires; 2900 u32 flags; 2901 2902 ASSERT_RTNL(); 2903 2904 if (cfg->plen > 128) 2905 return -EINVAL; 2906 2907 /* check the lifetime */ 2908 if (!cfg->valid_lft || cfg->preferred_lft > cfg->valid_lft) 2909 return -EINVAL; 2910 2911 if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR && cfg->plen != 64) 2912 return -EINVAL; 2913 2914 dev = __dev_get_by_index(net, ifindex); 2915 if (!dev) 2916 return -ENODEV; 2917 2918 idev = addrconf_add_dev(dev); 2919 if (IS_ERR(idev)) 2920 return PTR_ERR(idev); 2921 2922 if (cfg->ifa_flags & IFA_F_MCAUTOJOIN) { 2923 int ret = ipv6_mc_config(net->ipv6.mc_autojoin_sk, 2924 true, cfg->pfx, ifindex); 2925 2926 if (ret < 0) 2927 return ret; 2928 } 2929 2930 cfg->scope = ipv6_addr_scope(cfg->pfx); 2931 2932 timeout = addrconf_timeout_fixup(cfg->valid_lft, HZ); 2933 if (addrconf_finite_timeout(timeout)) { 2934 expires = jiffies_to_clock_t(timeout * HZ); 2935 cfg->valid_lft = timeout; 2936 flags = RTF_EXPIRES; 2937 } else { 2938 expires = 0; 2939 flags = 0; 2940 cfg->ifa_flags |= IFA_F_PERMANENT; 2941 } 2942 2943 timeout = addrconf_timeout_fixup(cfg->preferred_lft, HZ); 2944 if (addrconf_finite_timeout(timeout)) { 2945 if (timeout == 0) 2946 cfg->ifa_flags |= IFA_F_DEPRECATED; 2947 cfg->preferred_lft = timeout; 2948 } 2949 2950 ifp = ipv6_add_addr(idev, cfg, true, extack); 2951 if (!IS_ERR(ifp)) { 2952 if (!(cfg->ifa_flags & IFA_F_NOPREFIXROUTE)) { 2953 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, 2954 ifp->rt_priority, dev, expires, 2955 flags, GFP_KERNEL); 2956 } 2957 2958 /* Send a netlink notification if DAD is enabled and 2959 * optimistic flag is not set 2960 */ 2961 if (!(ifp->flags & (IFA_F_OPTIMISTIC | IFA_F_NODAD))) 2962 ipv6_ifa_notify(0, ifp); 2963 /* 2964 * Note that section 3.1 of RFC 4429 indicates 2965 * that the Optimistic flag should not be set for 2966 * manually configured addresses 2967 */ 2968 addrconf_dad_start(ifp); 2969 if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR) 2970 manage_tempaddrs(idev, ifp, cfg->valid_lft, 2971 cfg->preferred_lft, true, jiffies); 2972 in6_ifa_put(ifp); 2973 addrconf_verify_rtnl(); 2974 return 0; 2975 } else if (cfg->ifa_flags & IFA_F_MCAUTOJOIN) { 2976 ipv6_mc_config(net->ipv6.mc_autojoin_sk, false, 2977 cfg->pfx, ifindex); 2978 } 2979 2980 return PTR_ERR(ifp); 2981 } 2982 2983 static int inet6_addr_del(struct net *net, int ifindex, u32 ifa_flags, 2984 const struct in6_addr *pfx, unsigned int plen) 2985 { 2986 struct inet6_ifaddr *ifp; 2987 struct inet6_dev *idev; 2988 struct net_device *dev; 2989 2990 if (plen > 128) 2991 return -EINVAL; 2992 2993 dev = __dev_get_by_index(net, ifindex); 2994 if (!dev) 2995 return -ENODEV; 2996 2997 idev = __in6_dev_get(dev); 2998 if (!idev) 2999 return -ENXIO; 3000 3001 read_lock_bh(&idev->lock); 3002 list_for_each_entry(ifp, &idev->addr_list, if_list) { 3003 if (ifp->prefix_len == plen && 3004 ipv6_addr_equal(pfx, &ifp->addr)) { 3005 in6_ifa_hold(ifp); 3006 read_unlock_bh(&idev->lock); 3007 3008 if (!(ifp->flags & IFA_F_TEMPORARY) && 3009 (ifa_flags & IFA_F_MANAGETEMPADDR)) 3010 manage_tempaddrs(idev, ifp, 0, 0, false, 3011 jiffies); 3012 ipv6_del_addr(ifp); 3013 addrconf_verify_rtnl(); 3014 if (ipv6_addr_is_multicast(pfx)) { 3015 ipv6_mc_config(net->ipv6.mc_autojoin_sk, 3016 false, pfx, dev->ifindex); 3017 } 3018 return 0; 3019 } 3020 } 3021 read_unlock_bh(&idev->lock); 3022 return -EADDRNOTAVAIL; 3023 } 3024 3025 3026 int addrconf_add_ifaddr(struct net *net, void __user *arg) 3027 { 3028 struct ifa6_config cfg = { 3029 .ifa_flags = IFA_F_PERMANENT, 3030 .preferred_lft = INFINITY_LIFE_TIME, 3031 .valid_lft = INFINITY_LIFE_TIME, 3032 }; 3033 struct in6_ifreq ireq; 3034 int err; 3035 3036 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 3037 return -EPERM; 3038 3039 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 3040 return -EFAULT; 3041 3042 cfg.pfx = &ireq.ifr6_addr; 3043 cfg.plen = ireq.ifr6_prefixlen; 3044 3045 rtnl_lock(); 3046 err = inet6_addr_add(net, ireq.ifr6_ifindex, &cfg, NULL); 3047 rtnl_unlock(); 3048 return err; 3049 } 3050 3051 int addrconf_del_ifaddr(struct net *net, void __user *arg) 3052 { 3053 struct in6_ifreq ireq; 3054 int err; 3055 3056 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 3057 return -EPERM; 3058 3059 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 3060 return -EFAULT; 3061 3062 rtnl_lock(); 3063 err = inet6_addr_del(net, ireq.ifr6_ifindex, 0, &ireq.ifr6_addr, 3064 ireq.ifr6_prefixlen); 3065 rtnl_unlock(); 3066 return err; 3067 } 3068 3069 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr, 3070 int plen, int scope) 3071 { 3072 struct inet6_ifaddr *ifp; 3073 struct ifa6_config cfg = { 3074 .pfx = addr, 3075 .plen = plen, 3076 .ifa_flags = IFA_F_PERMANENT, 3077 .valid_lft = INFINITY_LIFE_TIME, 3078 .preferred_lft = INFINITY_LIFE_TIME, 3079 .scope = scope 3080 }; 3081 3082 ifp = ipv6_add_addr(idev, &cfg, true, NULL); 3083 if (!IS_ERR(ifp)) { 3084 spin_lock_bh(&ifp->lock); 3085 ifp->flags &= ~IFA_F_TENTATIVE; 3086 spin_unlock_bh(&ifp->lock); 3087 rt_genid_bump_ipv6(dev_net(idev->dev)); 3088 ipv6_ifa_notify(RTM_NEWADDR, ifp); 3089 in6_ifa_put(ifp); 3090 } 3091 } 3092 3093 #if IS_ENABLED(CONFIG_IPV6_SIT) 3094 static void sit_add_v4_addrs(struct inet6_dev *idev) 3095 { 3096 struct in6_addr addr; 3097 struct net_device *dev; 3098 struct net *net = dev_net(idev->dev); 3099 int scope, plen; 3100 u32 pflags = 0; 3101 3102 ASSERT_RTNL(); 3103 3104 memset(&addr, 0, sizeof(struct in6_addr)); 3105 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4); 3106 3107 if (idev->dev->flags&IFF_POINTOPOINT) { 3108 addr.s6_addr32[0] = htonl(0xfe800000); 3109 scope = IFA_LINK; 3110 plen = 64; 3111 } else { 3112 scope = IPV6_ADDR_COMPATv4; 3113 plen = 96; 3114 pflags |= RTF_NONEXTHOP; 3115 } 3116 3117 if (addr.s6_addr32[3]) { 3118 add_addr(idev, &addr, plen, scope); 3119 addrconf_prefix_route(&addr, plen, 0, idev->dev, 0, pflags, 3120 GFP_KERNEL); 3121 return; 3122 } 3123 3124 for_each_netdev(net, dev) { 3125 struct in_device *in_dev = __in_dev_get_rtnl(dev); 3126 if (in_dev && (dev->flags & IFF_UP)) { 3127 struct in_ifaddr *ifa; 3128 3129 int flag = scope; 3130 3131 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) { 3132 3133 addr.s6_addr32[3] = ifa->ifa_local; 3134 3135 if (ifa->ifa_scope == RT_SCOPE_LINK) 3136 continue; 3137 if (ifa->ifa_scope >= RT_SCOPE_HOST) { 3138 if (idev->dev->flags&IFF_POINTOPOINT) 3139 continue; 3140 flag |= IFA_HOST; 3141 } 3142 3143 add_addr(idev, &addr, plen, flag); 3144 addrconf_prefix_route(&addr, plen, 0, idev->dev, 3145 0, pflags, GFP_KERNEL); 3146 } 3147 } 3148 } 3149 } 3150 #endif 3151 3152 static void init_loopback(struct net_device *dev) 3153 { 3154 struct inet6_dev *idev; 3155 3156 /* ::1 */ 3157 3158 ASSERT_RTNL(); 3159 3160 idev = ipv6_find_idev(dev); 3161 if (!idev) { 3162 pr_debug("%s: add_dev failed\n", __func__); 3163 return; 3164 } 3165 3166 add_addr(idev, &in6addr_loopback, 128, IFA_HOST); 3167 } 3168 3169 void addrconf_add_linklocal(struct inet6_dev *idev, 3170 const struct in6_addr *addr, u32 flags) 3171 { 3172 struct ifa6_config cfg = { 3173 .pfx = addr, 3174 .plen = 64, 3175 .ifa_flags = flags | IFA_F_PERMANENT, 3176 .valid_lft = INFINITY_LIFE_TIME, 3177 .preferred_lft = INFINITY_LIFE_TIME, 3178 .scope = IFA_LINK 3179 }; 3180 struct inet6_ifaddr *ifp; 3181 3182 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 3183 if ((dev_net(idev->dev)->ipv6.devconf_all->optimistic_dad || 3184 idev->cnf.optimistic_dad) && 3185 !dev_net(idev->dev)->ipv6.devconf_all->forwarding) 3186 cfg.ifa_flags |= IFA_F_OPTIMISTIC; 3187 #endif 3188 3189 ifp = ipv6_add_addr(idev, &cfg, true, NULL); 3190 if (!IS_ERR(ifp)) { 3191 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, 0, idev->dev, 3192 0, 0, GFP_ATOMIC); 3193 addrconf_dad_start(ifp); 3194 in6_ifa_put(ifp); 3195 } 3196 } 3197 EXPORT_SYMBOL_GPL(addrconf_add_linklocal); 3198 3199 static bool ipv6_reserved_interfaceid(struct in6_addr address) 3200 { 3201 if ((address.s6_addr32[2] | address.s6_addr32[3]) == 0) 3202 return true; 3203 3204 if (address.s6_addr32[2] == htonl(0x02005eff) && 3205 ((address.s6_addr32[3] & htonl(0xfe000000)) == htonl(0xfe000000))) 3206 return true; 3207 3208 if (address.s6_addr32[2] == htonl(0xfdffffff) && 3209 ((address.s6_addr32[3] & htonl(0xffffff80)) == htonl(0xffffff80))) 3210 return true; 3211 3212 return false; 3213 } 3214 3215 static int ipv6_generate_stable_address(struct in6_addr *address, 3216 u8 dad_count, 3217 const struct inet6_dev *idev) 3218 { 3219 static DEFINE_SPINLOCK(lock); 3220 static __u32 digest[SHA_DIGEST_WORDS]; 3221 static __u32 workspace[SHA_WORKSPACE_WORDS]; 3222 3223 static union { 3224 char __data[SHA_MESSAGE_BYTES]; 3225 struct { 3226 struct in6_addr secret; 3227 __be32 prefix[2]; 3228 unsigned char hwaddr[MAX_ADDR_LEN]; 3229 u8 dad_count; 3230 } __packed; 3231 } data; 3232 3233 struct in6_addr secret; 3234 struct in6_addr temp; 3235 struct net *net = dev_net(idev->dev); 3236 3237 BUILD_BUG_ON(sizeof(data.__data) != sizeof(data)); 3238 3239 if (idev->cnf.stable_secret.initialized) 3240 secret = idev->cnf.stable_secret.secret; 3241 else if (net->ipv6.devconf_dflt->stable_secret.initialized) 3242 secret = net->ipv6.devconf_dflt->stable_secret.secret; 3243 else 3244 return -1; 3245 3246 retry: 3247 spin_lock_bh(&lock); 3248 3249 sha_init(digest); 3250 memset(&data, 0, sizeof(data)); 3251 memset(workspace, 0, sizeof(workspace)); 3252 memcpy(data.hwaddr, idev->dev->perm_addr, idev->dev->addr_len); 3253 data.prefix[0] = address->s6_addr32[0]; 3254 data.prefix[1] = address->s6_addr32[1]; 3255 data.secret = secret; 3256 data.dad_count = dad_count; 3257 3258 sha_transform(digest, data.__data, workspace); 3259 3260 temp = *address; 3261 temp.s6_addr32[2] = (__force __be32)digest[0]; 3262 temp.s6_addr32[3] = (__force __be32)digest[1]; 3263 3264 spin_unlock_bh(&lock); 3265 3266 if (ipv6_reserved_interfaceid(temp)) { 3267 dad_count++; 3268 if (dad_count > dev_net(idev->dev)->ipv6.sysctl.idgen_retries) 3269 return -1; 3270 goto retry; 3271 } 3272 3273 *address = temp; 3274 return 0; 3275 } 3276 3277 static void ipv6_gen_mode_random_init(struct inet6_dev *idev) 3278 { 3279 struct ipv6_stable_secret *s = &idev->cnf.stable_secret; 3280 3281 if (s->initialized) 3282 return; 3283 s = &idev->cnf.stable_secret; 3284 get_random_bytes(&s->secret, sizeof(s->secret)); 3285 s->initialized = true; 3286 } 3287 3288 static void addrconf_addr_gen(struct inet6_dev *idev, bool prefix_route) 3289 { 3290 struct in6_addr addr; 3291 3292 /* no link local addresses on L3 master devices */ 3293 if (netif_is_l3_master(idev->dev)) 3294 return; 3295 3296 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0); 3297 3298 switch (idev->cnf.addr_gen_mode) { 3299 case IN6_ADDR_GEN_MODE_RANDOM: 3300 ipv6_gen_mode_random_init(idev); 3301 /* fallthrough */ 3302 case IN6_ADDR_GEN_MODE_STABLE_PRIVACY: 3303 if (!ipv6_generate_stable_address(&addr, 0, idev)) 3304 addrconf_add_linklocal(idev, &addr, 3305 IFA_F_STABLE_PRIVACY); 3306 else if (prefix_route) 3307 addrconf_prefix_route(&addr, 64, 0, idev->dev, 3308 0, 0, GFP_KERNEL); 3309 break; 3310 case IN6_ADDR_GEN_MODE_EUI64: 3311 /* addrconf_add_linklocal also adds a prefix_route and we 3312 * only need to care about prefix routes if ipv6_generate_eui64 3313 * couldn't generate one. 3314 */ 3315 if (ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) == 0) 3316 addrconf_add_linklocal(idev, &addr, 0); 3317 else if (prefix_route) 3318 addrconf_prefix_route(&addr, 64, 0, idev->dev, 3319 0, 0, GFP_KERNEL); 3320 break; 3321 case IN6_ADDR_GEN_MODE_NONE: 3322 default: 3323 /* will not add any link local address */ 3324 break; 3325 } 3326 } 3327 3328 static void addrconf_dev_config(struct net_device *dev) 3329 { 3330 struct inet6_dev *idev; 3331 3332 ASSERT_RTNL(); 3333 3334 if ((dev->type != ARPHRD_ETHER) && 3335 (dev->type != ARPHRD_FDDI) && 3336 (dev->type != ARPHRD_ARCNET) && 3337 (dev->type != ARPHRD_INFINIBAND) && 3338 (dev->type != ARPHRD_IEEE1394) && 3339 (dev->type != ARPHRD_TUNNEL6) && 3340 (dev->type != ARPHRD_6LOWPAN) && 3341 (dev->type != ARPHRD_IP6GRE) && 3342 (dev->type != ARPHRD_IPGRE) && 3343 (dev->type != ARPHRD_TUNNEL) && 3344 (dev->type != ARPHRD_NONE) && 3345 (dev->type != ARPHRD_RAWIP)) { 3346 /* Alas, we support only Ethernet autoconfiguration. */ 3347 return; 3348 } 3349 3350 idev = addrconf_add_dev(dev); 3351 if (IS_ERR(idev)) 3352 return; 3353 3354 /* this device type has no EUI support */ 3355 if (dev->type == ARPHRD_NONE && 3356 idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_EUI64) 3357 idev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_RANDOM; 3358 3359 addrconf_addr_gen(idev, false); 3360 } 3361 3362 #if IS_ENABLED(CONFIG_IPV6_SIT) 3363 static void addrconf_sit_config(struct net_device *dev) 3364 { 3365 struct inet6_dev *idev; 3366 3367 ASSERT_RTNL(); 3368 3369 /* 3370 * Configure the tunnel with one of our IPv4 3371 * addresses... we should configure all of 3372 * our v4 addrs in the tunnel 3373 */ 3374 3375 idev = ipv6_find_idev(dev); 3376 if (!idev) { 3377 pr_debug("%s: add_dev failed\n", __func__); 3378 return; 3379 } 3380 3381 if (dev->priv_flags & IFF_ISATAP) { 3382 addrconf_addr_gen(idev, false); 3383 return; 3384 } 3385 3386 sit_add_v4_addrs(idev); 3387 3388 if (dev->flags&IFF_POINTOPOINT) 3389 addrconf_add_mroute(dev); 3390 } 3391 #endif 3392 3393 #if IS_ENABLED(CONFIG_NET_IPGRE) 3394 static void addrconf_gre_config(struct net_device *dev) 3395 { 3396 struct inet6_dev *idev; 3397 3398 ASSERT_RTNL(); 3399 3400 idev = ipv6_find_idev(dev); 3401 if (!idev) { 3402 pr_debug("%s: add_dev failed\n", __func__); 3403 return; 3404 } 3405 3406 addrconf_addr_gen(idev, true); 3407 if (dev->flags & IFF_POINTOPOINT) 3408 addrconf_add_mroute(dev); 3409 } 3410 #endif 3411 3412 static int fixup_permanent_addr(struct net *net, 3413 struct inet6_dev *idev, 3414 struct inet6_ifaddr *ifp) 3415 { 3416 /* !fib6_node means the host route was removed from the 3417 * FIB, for example, if 'lo' device is taken down. In that 3418 * case regenerate the host route. 3419 */ 3420 if (!ifp->rt || !ifp->rt->fib6_node) { 3421 struct fib6_info *f6i, *prev; 3422 3423 f6i = addrconf_f6i_alloc(net, idev, &ifp->addr, false, 3424 GFP_ATOMIC); 3425 if (IS_ERR(f6i)) 3426 return PTR_ERR(f6i); 3427 3428 /* ifp->rt can be accessed outside of rtnl */ 3429 spin_lock(&ifp->lock); 3430 prev = ifp->rt; 3431 ifp->rt = f6i; 3432 spin_unlock(&ifp->lock); 3433 3434 fib6_info_release(prev); 3435 } 3436 3437 if (!(ifp->flags & IFA_F_NOPREFIXROUTE)) { 3438 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, 3439 ifp->rt_priority, idev->dev, 0, 0, 3440 GFP_ATOMIC); 3441 } 3442 3443 if (ifp->state == INET6_IFADDR_STATE_PREDAD) 3444 addrconf_dad_start(ifp); 3445 3446 return 0; 3447 } 3448 3449 static void addrconf_permanent_addr(struct net *net, struct net_device *dev) 3450 { 3451 struct inet6_ifaddr *ifp, *tmp; 3452 struct inet6_dev *idev; 3453 3454 idev = __in6_dev_get(dev); 3455 if (!idev) 3456 return; 3457 3458 write_lock_bh(&idev->lock); 3459 3460 list_for_each_entry_safe(ifp, tmp, &idev->addr_list, if_list) { 3461 if ((ifp->flags & IFA_F_PERMANENT) && 3462 fixup_permanent_addr(net, idev, ifp) < 0) { 3463 write_unlock_bh(&idev->lock); 3464 in6_ifa_hold(ifp); 3465 ipv6_del_addr(ifp); 3466 write_lock_bh(&idev->lock); 3467 3468 net_info_ratelimited("%s: Failed to add prefix route for address %pI6c; dropping\n", 3469 idev->dev->name, &ifp->addr); 3470 } 3471 } 3472 3473 write_unlock_bh(&idev->lock); 3474 } 3475 3476 static int addrconf_notify(struct notifier_block *this, unsigned long event, 3477 void *ptr) 3478 { 3479 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 3480 struct netdev_notifier_change_info *change_info; 3481 struct netdev_notifier_changeupper_info *info; 3482 struct inet6_dev *idev = __in6_dev_get(dev); 3483 struct net *net = dev_net(dev); 3484 int run_pending = 0; 3485 int err; 3486 3487 switch (event) { 3488 case NETDEV_REGISTER: 3489 if (!idev && dev->mtu >= IPV6_MIN_MTU) { 3490 idev = ipv6_add_dev(dev); 3491 if (IS_ERR(idev)) 3492 return notifier_from_errno(PTR_ERR(idev)); 3493 } 3494 break; 3495 3496 case NETDEV_CHANGEMTU: 3497 /* if MTU under IPV6_MIN_MTU stop IPv6 on this interface. */ 3498 if (dev->mtu < IPV6_MIN_MTU) { 3499 addrconf_ifdown(dev, dev != net->loopback_dev); 3500 break; 3501 } 3502 3503 if (idev) { 3504 rt6_mtu_change(dev, dev->mtu); 3505 idev->cnf.mtu6 = dev->mtu; 3506 break; 3507 } 3508 3509 /* allocate new idev */ 3510 idev = ipv6_add_dev(dev); 3511 if (IS_ERR(idev)) 3512 break; 3513 3514 /* device is still not ready */ 3515 if (!(idev->if_flags & IF_READY)) 3516 break; 3517 3518 run_pending = 1; 3519 3520 /* fall through */ 3521 3522 case NETDEV_UP: 3523 case NETDEV_CHANGE: 3524 if (dev->flags & IFF_SLAVE) 3525 break; 3526 3527 if (idev && idev->cnf.disable_ipv6) 3528 break; 3529 3530 if (event == NETDEV_UP) { 3531 /* restore routes for permanent addresses */ 3532 addrconf_permanent_addr(net, dev); 3533 3534 if (!addrconf_link_ready(dev)) { 3535 /* device is not ready yet. */ 3536 pr_debug("ADDRCONF(NETDEV_UP): %s: link is not ready\n", 3537 dev->name); 3538 break; 3539 } 3540 3541 if (!idev && dev->mtu >= IPV6_MIN_MTU) 3542 idev = ipv6_add_dev(dev); 3543 3544 if (!IS_ERR_OR_NULL(idev)) { 3545 idev->if_flags |= IF_READY; 3546 run_pending = 1; 3547 } 3548 } else if (event == NETDEV_CHANGE) { 3549 if (!addrconf_link_ready(dev)) { 3550 /* device is still not ready. */ 3551 rt6_sync_down_dev(dev, event); 3552 break; 3553 } 3554 3555 if (!IS_ERR_OR_NULL(idev)) { 3556 if (idev->if_flags & IF_READY) { 3557 /* device is already configured - 3558 * but resend MLD reports, we might 3559 * have roamed and need to update 3560 * multicast snooping switches 3561 */ 3562 ipv6_mc_up(idev); 3563 change_info = ptr; 3564 if (change_info->flags_changed & IFF_NOARP) 3565 addrconf_dad_run(idev, true); 3566 rt6_sync_up(dev, RTNH_F_LINKDOWN); 3567 break; 3568 } 3569 idev->if_flags |= IF_READY; 3570 } 3571 3572 pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n", 3573 dev->name); 3574 3575 run_pending = 1; 3576 } 3577 3578 switch (dev->type) { 3579 #if IS_ENABLED(CONFIG_IPV6_SIT) 3580 case ARPHRD_SIT: 3581 addrconf_sit_config(dev); 3582 break; 3583 #endif 3584 #if IS_ENABLED(CONFIG_NET_IPGRE) 3585 case ARPHRD_IPGRE: 3586 addrconf_gre_config(dev); 3587 break; 3588 #endif 3589 case ARPHRD_LOOPBACK: 3590 init_loopback(dev); 3591 break; 3592 3593 default: 3594 addrconf_dev_config(dev); 3595 break; 3596 } 3597 3598 if (!IS_ERR_OR_NULL(idev)) { 3599 if (run_pending) 3600 addrconf_dad_run(idev, false); 3601 3602 /* Device has an address by now */ 3603 rt6_sync_up(dev, RTNH_F_DEAD); 3604 3605 /* 3606 * If the MTU changed during the interface down, 3607 * when the interface up, the changed MTU must be 3608 * reflected in the idev as well as routers. 3609 */ 3610 if (idev->cnf.mtu6 != dev->mtu && 3611 dev->mtu >= IPV6_MIN_MTU) { 3612 rt6_mtu_change(dev, dev->mtu); 3613 idev->cnf.mtu6 = dev->mtu; 3614 } 3615 idev->tstamp = jiffies; 3616 inet6_ifinfo_notify(RTM_NEWLINK, idev); 3617 3618 /* 3619 * If the changed mtu during down is lower than 3620 * IPV6_MIN_MTU stop IPv6 on this interface. 3621 */ 3622 if (dev->mtu < IPV6_MIN_MTU) 3623 addrconf_ifdown(dev, dev != net->loopback_dev); 3624 } 3625 break; 3626 3627 case NETDEV_DOWN: 3628 case NETDEV_UNREGISTER: 3629 /* 3630 * Remove all addresses from this interface. 3631 */ 3632 addrconf_ifdown(dev, event != NETDEV_DOWN); 3633 break; 3634 3635 case NETDEV_CHANGENAME: 3636 if (idev) { 3637 snmp6_unregister_dev(idev); 3638 addrconf_sysctl_unregister(idev); 3639 err = addrconf_sysctl_register(idev); 3640 if (err) 3641 return notifier_from_errno(err); 3642 err = snmp6_register_dev(idev); 3643 if (err) { 3644 addrconf_sysctl_unregister(idev); 3645 return notifier_from_errno(err); 3646 } 3647 } 3648 break; 3649 3650 case NETDEV_PRE_TYPE_CHANGE: 3651 case NETDEV_POST_TYPE_CHANGE: 3652 if (idev) 3653 addrconf_type_change(dev, event); 3654 break; 3655 3656 case NETDEV_CHANGEUPPER: 3657 info = ptr; 3658 3659 /* flush all routes if dev is linked to or unlinked from 3660 * an L3 master device (e.g., VRF) 3661 */ 3662 if (info->upper_dev && netif_is_l3_master(info->upper_dev)) 3663 addrconf_ifdown(dev, 0); 3664 } 3665 3666 return NOTIFY_OK; 3667 } 3668 3669 /* 3670 * addrconf module should be notified of a device going up 3671 */ 3672 static struct notifier_block ipv6_dev_notf = { 3673 .notifier_call = addrconf_notify, 3674 .priority = ADDRCONF_NOTIFY_PRIORITY, 3675 }; 3676 3677 static void addrconf_type_change(struct net_device *dev, unsigned long event) 3678 { 3679 struct inet6_dev *idev; 3680 ASSERT_RTNL(); 3681 3682 idev = __in6_dev_get(dev); 3683 3684 if (event == NETDEV_POST_TYPE_CHANGE) 3685 ipv6_mc_remap(idev); 3686 else if (event == NETDEV_PRE_TYPE_CHANGE) 3687 ipv6_mc_unmap(idev); 3688 } 3689 3690 static bool addr_is_local(const struct in6_addr *addr) 3691 { 3692 return ipv6_addr_type(addr) & 3693 (IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK); 3694 } 3695 3696 static int addrconf_ifdown(struct net_device *dev, int how) 3697 { 3698 unsigned long event = how ? NETDEV_UNREGISTER : NETDEV_DOWN; 3699 struct net *net = dev_net(dev); 3700 struct inet6_dev *idev; 3701 struct inet6_ifaddr *ifa, *tmp; 3702 bool keep_addr = false; 3703 int state, i; 3704 3705 ASSERT_RTNL(); 3706 3707 rt6_disable_ip(dev, event); 3708 3709 idev = __in6_dev_get(dev); 3710 if (!idev) 3711 return -ENODEV; 3712 3713 /* 3714 * Step 1: remove reference to ipv6 device from parent device. 3715 * Do not dev_put! 3716 */ 3717 if (how) { 3718 idev->dead = 1; 3719 3720 /* protected by rtnl_lock */ 3721 RCU_INIT_POINTER(dev->ip6_ptr, NULL); 3722 3723 /* Step 1.5: remove snmp6 entry */ 3724 snmp6_unregister_dev(idev); 3725 3726 } 3727 3728 /* combine the user config with event to determine if permanent 3729 * addresses are to be removed from address hash table 3730 */ 3731 if (!how && !idev->cnf.disable_ipv6) { 3732 /* aggregate the system setting and interface setting */ 3733 int _keep_addr = net->ipv6.devconf_all->keep_addr_on_down; 3734 3735 if (!_keep_addr) 3736 _keep_addr = idev->cnf.keep_addr_on_down; 3737 3738 keep_addr = (_keep_addr > 0); 3739 } 3740 3741 /* Step 2: clear hash table */ 3742 for (i = 0; i < IN6_ADDR_HSIZE; i++) { 3743 struct hlist_head *h = &inet6_addr_lst[i]; 3744 3745 spin_lock_bh(&addrconf_hash_lock); 3746 restart: 3747 hlist_for_each_entry_rcu(ifa, h, addr_lst) { 3748 if (ifa->idev == idev) { 3749 addrconf_del_dad_work(ifa); 3750 /* combined flag + permanent flag decide if 3751 * address is retained on a down event 3752 */ 3753 if (!keep_addr || 3754 !(ifa->flags & IFA_F_PERMANENT) || 3755 addr_is_local(&ifa->addr)) { 3756 hlist_del_init_rcu(&ifa->addr_lst); 3757 goto restart; 3758 } 3759 } 3760 } 3761 spin_unlock_bh(&addrconf_hash_lock); 3762 } 3763 3764 write_lock_bh(&idev->lock); 3765 3766 addrconf_del_rs_timer(idev); 3767 3768 /* Step 2: clear flags for stateless addrconf */ 3769 if (!how) 3770 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY); 3771 3772 /* Step 3: clear tempaddr list */ 3773 while (!list_empty(&idev->tempaddr_list)) { 3774 ifa = list_first_entry(&idev->tempaddr_list, 3775 struct inet6_ifaddr, tmp_list); 3776 list_del(&ifa->tmp_list); 3777 write_unlock_bh(&idev->lock); 3778 spin_lock_bh(&ifa->lock); 3779 3780 if (ifa->ifpub) { 3781 in6_ifa_put(ifa->ifpub); 3782 ifa->ifpub = NULL; 3783 } 3784 spin_unlock_bh(&ifa->lock); 3785 in6_ifa_put(ifa); 3786 write_lock_bh(&idev->lock); 3787 } 3788 3789 list_for_each_entry_safe(ifa, tmp, &idev->addr_list, if_list) { 3790 struct fib6_info *rt = NULL; 3791 bool keep; 3792 3793 addrconf_del_dad_work(ifa); 3794 3795 keep = keep_addr && (ifa->flags & IFA_F_PERMANENT) && 3796 !addr_is_local(&ifa->addr); 3797 3798 write_unlock_bh(&idev->lock); 3799 spin_lock_bh(&ifa->lock); 3800 3801 if (keep) { 3802 /* set state to skip the notifier below */ 3803 state = INET6_IFADDR_STATE_DEAD; 3804 ifa->state = INET6_IFADDR_STATE_PREDAD; 3805 if (!(ifa->flags & IFA_F_NODAD)) 3806 ifa->flags |= IFA_F_TENTATIVE; 3807 3808 rt = ifa->rt; 3809 ifa->rt = NULL; 3810 } else { 3811 state = ifa->state; 3812 ifa->state = INET6_IFADDR_STATE_DEAD; 3813 } 3814 3815 spin_unlock_bh(&ifa->lock); 3816 3817 if (rt) 3818 ip6_del_rt(net, rt); 3819 3820 if (state != INET6_IFADDR_STATE_DEAD) { 3821 __ipv6_ifa_notify(RTM_DELADDR, ifa); 3822 inet6addr_notifier_call_chain(NETDEV_DOWN, ifa); 3823 } else { 3824 if (idev->cnf.forwarding) 3825 addrconf_leave_anycast(ifa); 3826 addrconf_leave_solict(ifa->idev, &ifa->addr); 3827 } 3828 3829 write_lock_bh(&idev->lock); 3830 if (!keep) { 3831 list_del_rcu(&ifa->if_list); 3832 in6_ifa_put(ifa); 3833 } 3834 } 3835 3836 write_unlock_bh(&idev->lock); 3837 3838 /* Step 5: Discard anycast and multicast list */ 3839 if (how) { 3840 ipv6_ac_destroy_dev(idev); 3841 ipv6_mc_destroy_dev(idev); 3842 } else { 3843 ipv6_mc_down(idev); 3844 } 3845 3846 idev->tstamp = jiffies; 3847 3848 /* Last: Shot the device (if unregistered) */ 3849 if (how) { 3850 addrconf_sysctl_unregister(idev); 3851 neigh_parms_release(&nd_tbl, idev->nd_parms); 3852 neigh_ifdown(&nd_tbl, dev); 3853 in6_dev_put(idev); 3854 } 3855 return 0; 3856 } 3857 3858 static void addrconf_rs_timer(struct timer_list *t) 3859 { 3860 struct inet6_dev *idev = from_timer(idev, t, rs_timer); 3861 struct net_device *dev = idev->dev; 3862 struct in6_addr lladdr; 3863 3864 write_lock(&idev->lock); 3865 if (idev->dead || !(idev->if_flags & IF_READY)) 3866 goto out; 3867 3868 if (!ipv6_accept_ra(idev)) 3869 goto out; 3870 3871 /* Announcement received after solicitation was sent */ 3872 if (idev->if_flags & IF_RA_RCVD) 3873 goto out; 3874 3875 if (idev->rs_probes++ < idev->cnf.rtr_solicits || idev->cnf.rtr_solicits < 0) { 3876 write_unlock(&idev->lock); 3877 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE)) 3878 ndisc_send_rs(dev, &lladdr, 3879 &in6addr_linklocal_allrouters); 3880 else 3881 goto put; 3882 3883 write_lock(&idev->lock); 3884 idev->rs_interval = rfc3315_s14_backoff_update( 3885 idev->rs_interval, idev->cnf.rtr_solicit_max_interval); 3886 /* The wait after the last probe can be shorter */ 3887 addrconf_mod_rs_timer(idev, (idev->rs_probes == 3888 idev->cnf.rtr_solicits) ? 3889 idev->cnf.rtr_solicit_delay : 3890 idev->rs_interval); 3891 } else { 3892 /* 3893 * Note: we do not support deprecated "all on-link" 3894 * assumption any longer. 3895 */ 3896 pr_debug("%s: no IPv6 routers present\n", idev->dev->name); 3897 } 3898 3899 out: 3900 write_unlock(&idev->lock); 3901 put: 3902 in6_dev_put(idev); 3903 } 3904 3905 /* 3906 * Duplicate Address Detection 3907 */ 3908 static void addrconf_dad_kick(struct inet6_ifaddr *ifp) 3909 { 3910 unsigned long rand_num; 3911 struct inet6_dev *idev = ifp->idev; 3912 u64 nonce; 3913 3914 if (ifp->flags & IFA_F_OPTIMISTIC) 3915 rand_num = 0; 3916 else 3917 rand_num = prandom_u32() % (idev->cnf.rtr_solicit_delay ? : 1); 3918 3919 nonce = 0; 3920 if (idev->cnf.enhanced_dad || 3921 dev_net(idev->dev)->ipv6.devconf_all->enhanced_dad) { 3922 do 3923 get_random_bytes(&nonce, 6); 3924 while (nonce == 0); 3925 } 3926 ifp->dad_nonce = nonce; 3927 ifp->dad_probes = idev->cnf.dad_transmits; 3928 addrconf_mod_dad_work(ifp, rand_num); 3929 } 3930 3931 static void addrconf_dad_begin(struct inet6_ifaddr *ifp) 3932 { 3933 struct inet6_dev *idev = ifp->idev; 3934 struct net_device *dev = idev->dev; 3935 bool bump_id, notify = false; 3936 struct net *net; 3937 3938 addrconf_join_solict(dev, &ifp->addr); 3939 3940 prandom_seed((__force u32) ifp->addr.s6_addr32[3]); 3941 3942 read_lock_bh(&idev->lock); 3943 spin_lock(&ifp->lock); 3944 if (ifp->state == INET6_IFADDR_STATE_DEAD) 3945 goto out; 3946 3947 net = dev_net(dev); 3948 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) || 3949 (net->ipv6.devconf_all->accept_dad < 1 && 3950 idev->cnf.accept_dad < 1) || 3951 !(ifp->flags&IFA_F_TENTATIVE) || 3952 ifp->flags & IFA_F_NODAD) { 3953 bool send_na = false; 3954 3955 if (ifp->flags & IFA_F_TENTATIVE && 3956 !(ifp->flags & IFA_F_OPTIMISTIC)) 3957 send_na = true; 3958 bump_id = ifp->flags & IFA_F_TENTATIVE; 3959 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED); 3960 spin_unlock(&ifp->lock); 3961 read_unlock_bh(&idev->lock); 3962 3963 addrconf_dad_completed(ifp, bump_id, send_na); 3964 return; 3965 } 3966 3967 if (!(idev->if_flags & IF_READY)) { 3968 spin_unlock(&ifp->lock); 3969 read_unlock_bh(&idev->lock); 3970 /* 3971 * If the device is not ready: 3972 * - keep it tentative if it is a permanent address. 3973 * - otherwise, kill it. 3974 */ 3975 in6_ifa_hold(ifp); 3976 addrconf_dad_stop(ifp, 0); 3977 return; 3978 } 3979 3980 /* 3981 * Optimistic nodes can start receiving 3982 * Frames right away 3983 */ 3984 if (ifp->flags & IFA_F_OPTIMISTIC) { 3985 ip6_ins_rt(net, ifp->rt); 3986 if (ipv6_use_optimistic_addr(net, idev)) { 3987 /* Because optimistic nodes can use this address, 3988 * notify listeners. If DAD fails, RTM_DELADDR is sent. 3989 */ 3990 notify = true; 3991 } 3992 } 3993 3994 addrconf_dad_kick(ifp); 3995 out: 3996 spin_unlock(&ifp->lock); 3997 read_unlock_bh(&idev->lock); 3998 if (notify) 3999 ipv6_ifa_notify(RTM_NEWADDR, ifp); 4000 } 4001 4002 static void addrconf_dad_start(struct inet6_ifaddr *ifp) 4003 { 4004 bool begin_dad = false; 4005 4006 spin_lock_bh(&ifp->lock); 4007 if (ifp->state != INET6_IFADDR_STATE_DEAD) { 4008 ifp->state = INET6_IFADDR_STATE_PREDAD; 4009 begin_dad = true; 4010 } 4011 spin_unlock_bh(&ifp->lock); 4012 4013 if (begin_dad) 4014 addrconf_mod_dad_work(ifp, 0); 4015 } 4016 4017 static void addrconf_dad_work(struct work_struct *w) 4018 { 4019 struct inet6_ifaddr *ifp = container_of(to_delayed_work(w), 4020 struct inet6_ifaddr, 4021 dad_work); 4022 struct inet6_dev *idev = ifp->idev; 4023 bool bump_id, disable_ipv6 = false; 4024 struct in6_addr mcaddr; 4025 4026 enum { 4027 DAD_PROCESS, 4028 DAD_BEGIN, 4029 DAD_ABORT, 4030 } action = DAD_PROCESS; 4031 4032 rtnl_lock(); 4033 4034 spin_lock_bh(&ifp->lock); 4035 if (ifp->state == INET6_IFADDR_STATE_PREDAD) { 4036 action = DAD_BEGIN; 4037 ifp->state = INET6_IFADDR_STATE_DAD; 4038 } else if (ifp->state == INET6_IFADDR_STATE_ERRDAD) { 4039 action = DAD_ABORT; 4040 ifp->state = INET6_IFADDR_STATE_POSTDAD; 4041 4042 if ((dev_net(idev->dev)->ipv6.devconf_all->accept_dad > 1 || 4043 idev->cnf.accept_dad > 1) && 4044 !idev->cnf.disable_ipv6 && 4045 !(ifp->flags & IFA_F_STABLE_PRIVACY)) { 4046 struct in6_addr addr; 4047 4048 addr.s6_addr32[0] = htonl(0xfe800000); 4049 addr.s6_addr32[1] = 0; 4050 4051 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) && 4052 ipv6_addr_equal(&ifp->addr, &addr)) { 4053 /* DAD failed for link-local based on MAC */ 4054 idev->cnf.disable_ipv6 = 1; 4055 4056 pr_info("%s: IPv6 being disabled!\n", 4057 ifp->idev->dev->name); 4058 disable_ipv6 = true; 4059 } 4060 } 4061 } 4062 spin_unlock_bh(&ifp->lock); 4063 4064 if (action == DAD_BEGIN) { 4065 addrconf_dad_begin(ifp); 4066 goto out; 4067 } else if (action == DAD_ABORT) { 4068 in6_ifa_hold(ifp); 4069 addrconf_dad_stop(ifp, 1); 4070 if (disable_ipv6) 4071 addrconf_ifdown(idev->dev, 0); 4072 goto out; 4073 } 4074 4075 if (!ifp->dad_probes && addrconf_dad_end(ifp)) 4076 goto out; 4077 4078 write_lock_bh(&idev->lock); 4079 if (idev->dead || !(idev->if_flags & IF_READY)) { 4080 write_unlock_bh(&idev->lock); 4081 goto out; 4082 } 4083 4084 spin_lock(&ifp->lock); 4085 if (ifp->state == INET6_IFADDR_STATE_DEAD) { 4086 spin_unlock(&ifp->lock); 4087 write_unlock_bh(&idev->lock); 4088 goto out; 4089 } 4090 4091 if (ifp->dad_probes == 0) { 4092 bool send_na = false; 4093 4094 /* 4095 * DAD was successful 4096 */ 4097 4098 if (ifp->flags & IFA_F_TENTATIVE && 4099 !(ifp->flags & IFA_F_OPTIMISTIC)) 4100 send_na = true; 4101 bump_id = ifp->flags & IFA_F_TENTATIVE; 4102 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED); 4103 spin_unlock(&ifp->lock); 4104 write_unlock_bh(&idev->lock); 4105 4106 addrconf_dad_completed(ifp, bump_id, send_na); 4107 4108 goto out; 4109 } 4110 4111 ifp->dad_probes--; 4112 addrconf_mod_dad_work(ifp, 4113 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME)); 4114 spin_unlock(&ifp->lock); 4115 write_unlock_bh(&idev->lock); 4116 4117 /* send a neighbour solicitation for our addr */ 4118 addrconf_addr_solict_mult(&ifp->addr, &mcaddr); 4119 ndisc_send_ns(ifp->idev->dev, &ifp->addr, &mcaddr, &in6addr_any, 4120 ifp->dad_nonce); 4121 out: 4122 in6_ifa_put(ifp); 4123 rtnl_unlock(); 4124 } 4125 4126 /* ifp->idev must be at least read locked */ 4127 static bool ipv6_lonely_lladdr(struct inet6_ifaddr *ifp) 4128 { 4129 struct inet6_ifaddr *ifpiter; 4130 struct inet6_dev *idev = ifp->idev; 4131 4132 list_for_each_entry_reverse(ifpiter, &idev->addr_list, if_list) { 4133 if (ifpiter->scope > IFA_LINK) 4134 break; 4135 if (ifp != ifpiter && ifpiter->scope == IFA_LINK && 4136 (ifpiter->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE| 4137 IFA_F_OPTIMISTIC|IFA_F_DADFAILED)) == 4138 IFA_F_PERMANENT) 4139 return false; 4140 } 4141 return true; 4142 } 4143 4144 static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id, 4145 bool send_na) 4146 { 4147 struct net_device *dev = ifp->idev->dev; 4148 struct in6_addr lladdr; 4149 bool send_rs, send_mld; 4150 4151 addrconf_del_dad_work(ifp); 4152 4153 /* 4154 * Configure the address for reception. Now it is valid. 4155 */ 4156 4157 ipv6_ifa_notify(RTM_NEWADDR, ifp); 4158 4159 /* If added prefix is link local and we are prepared to process 4160 router advertisements, start sending router solicitations. 4161 */ 4162 4163 read_lock_bh(&ifp->idev->lock); 4164 send_mld = ifp->scope == IFA_LINK && ipv6_lonely_lladdr(ifp); 4165 send_rs = send_mld && 4166 ipv6_accept_ra(ifp->idev) && 4167 ifp->idev->cnf.rtr_solicits != 0 && 4168 (dev->flags&IFF_LOOPBACK) == 0; 4169 read_unlock_bh(&ifp->idev->lock); 4170 4171 /* While dad is in progress mld report's source address is in6_addrany. 4172 * Resend with proper ll now. 4173 */ 4174 if (send_mld) 4175 ipv6_mc_dad_complete(ifp->idev); 4176 4177 /* send unsolicited NA if enabled */ 4178 if (send_na && 4179 (ifp->idev->cnf.ndisc_notify || 4180 dev_net(dev)->ipv6.devconf_all->ndisc_notify)) { 4181 ndisc_send_na(dev, &in6addr_linklocal_allnodes, &ifp->addr, 4182 /*router=*/ !!ifp->idev->cnf.forwarding, 4183 /*solicited=*/ false, /*override=*/ true, 4184 /*inc_opt=*/ true); 4185 } 4186 4187 if (send_rs) { 4188 /* 4189 * If a host as already performed a random delay 4190 * [...] as part of DAD [...] there is no need 4191 * to delay again before sending the first RS 4192 */ 4193 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE)) 4194 return; 4195 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters); 4196 4197 write_lock_bh(&ifp->idev->lock); 4198 spin_lock(&ifp->lock); 4199 ifp->idev->rs_interval = rfc3315_s14_backoff_init( 4200 ifp->idev->cnf.rtr_solicit_interval); 4201 ifp->idev->rs_probes = 1; 4202 ifp->idev->if_flags |= IF_RS_SENT; 4203 addrconf_mod_rs_timer(ifp->idev, ifp->idev->rs_interval); 4204 spin_unlock(&ifp->lock); 4205 write_unlock_bh(&ifp->idev->lock); 4206 } 4207 4208 if (bump_id) 4209 rt_genid_bump_ipv6(dev_net(dev)); 4210 4211 /* Make sure that a new temporary address will be created 4212 * before this temporary address becomes deprecated. 4213 */ 4214 if (ifp->flags & IFA_F_TEMPORARY) 4215 addrconf_verify_rtnl(); 4216 } 4217 4218 static void addrconf_dad_run(struct inet6_dev *idev, bool restart) 4219 { 4220 struct inet6_ifaddr *ifp; 4221 4222 read_lock_bh(&idev->lock); 4223 list_for_each_entry(ifp, &idev->addr_list, if_list) { 4224 spin_lock(&ifp->lock); 4225 if ((ifp->flags & IFA_F_TENTATIVE && 4226 ifp->state == INET6_IFADDR_STATE_DAD) || restart) { 4227 if (restart) 4228 ifp->state = INET6_IFADDR_STATE_PREDAD; 4229 addrconf_dad_kick(ifp); 4230 } 4231 spin_unlock(&ifp->lock); 4232 } 4233 read_unlock_bh(&idev->lock); 4234 } 4235 4236 #ifdef CONFIG_PROC_FS 4237 struct if6_iter_state { 4238 struct seq_net_private p; 4239 int bucket; 4240 int offset; 4241 }; 4242 4243 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos) 4244 { 4245 struct if6_iter_state *state = seq->private; 4246 struct net *net = seq_file_net(seq); 4247 struct inet6_ifaddr *ifa = NULL; 4248 int p = 0; 4249 4250 /* initial bucket if pos is 0 */ 4251 if (pos == 0) { 4252 state->bucket = 0; 4253 state->offset = 0; 4254 } 4255 4256 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) { 4257 hlist_for_each_entry_rcu(ifa, &inet6_addr_lst[state->bucket], 4258 addr_lst) { 4259 if (!net_eq(dev_net(ifa->idev->dev), net)) 4260 continue; 4261 /* sync with offset */ 4262 if (p < state->offset) { 4263 p++; 4264 continue; 4265 } 4266 return ifa; 4267 } 4268 4269 /* prepare for next bucket */ 4270 state->offset = 0; 4271 p = 0; 4272 } 4273 return NULL; 4274 } 4275 4276 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, 4277 struct inet6_ifaddr *ifa) 4278 { 4279 struct if6_iter_state *state = seq->private; 4280 struct net *net = seq_file_net(seq); 4281 4282 hlist_for_each_entry_continue_rcu(ifa, addr_lst) { 4283 if (!net_eq(dev_net(ifa->idev->dev), net)) 4284 continue; 4285 state->offset++; 4286 return ifa; 4287 } 4288 4289 state->offset = 0; 4290 while (++state->bucket < IN6_ADDR_HSIZE) { 4291 hlist_for_each_entry_rcu(ifa, 4292 &inet6_addr_lst[state->bucket], addr_lst) { 4293 if (!net_eq(dev_net(ifa->idev->dev), net)) 4294 continue; 4295 return ifa; 4296 } 4297 } 4298 4299 return NULL; 4300 } 4301 4302 static void *if6_seq_start(struct seq_file *seq, loff_t *pos) 4303 __acquires(rcu) 4304 { 4305 rcu_read_lock(); 4306 return if6_get_first(seq, *pos); 4307 } 4308 4309 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos) 4310 { 4311 struct inet6_ifaddr *ifa; 4312 4313 ifa = if6_get_next(seq, v); 4314 ++*pos; 4315 return ifa; 4316 } 4317 4318 static void if6_seq_stop(struct seq_file *seq, void *v) 4319 __releases(rcu) 4320 { 4321 rcu_read_unlock(); 4322 } 4323 4324 static int if6_seq_show(struct seq_file *seq, void *v) 4325 { 4326 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v; 4327 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n", 4328 &ifp->addr, 4329 ifp->idev->dev->ifindex, 4330 ifp->prefix_len, 4331 ifp->scope, 4332 (u8) ifp->flags, 4333 ifp->idev->dev->name); 4334 return 0; 4335 } 4336 4337 static const struct seq_operations if6_seq_ops = { 4338 .start = if6_seq_start, 4339 .next = if6_seq_next, 4340 .show = if6_seq_show, 4341 .stop = if6_seq_stop, 4342 }; 4343 4344 static int __net_init if6_proc_net_init(struct net *net) 4345 { 4346 if (!proc_create_net("if_inet6", 0444, net->proc_net, &if6_seq_ops, 4347 sizeof(struct if6_iter_state))) 4348 return -ENOMEM; 4349 return 0; 4350 } 4351 4352 static void __net_exit if6_proc_net_exit(struct net *net) 4353 { 4354 remove_proc_entry("if_inet6", net->proc_net); 4355 } 4356 4357 static struct pernet_operations if6_proc_net_ops = { 4358 .init = if6_proc_net_init, 4359 .exit = if6_proc_net_exit, 4360 }; 4361 4362 int __init if6_proc_init(void) 4363 { 4364 return register_pernet_subsys(&if6_proc_net_ops); 4365 } 4366 4367 void if6_proc_exit(void) 4368 { 4369 unregister_pernet_subsys(&if6_proc_net_ops); 4370 } 4371 #endif /* CONFIG_PROC_FS */ 4372 4373 #if IS_ENABLED(CONFIG_IPV6_MIP6) 4374 /* Check if address is a home address configured on any interface. */ 4375 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr) 4376 { 4377 unsigned int hash = inet6_addr_hash(net, addr); 4378 struct inet6_ifaddr *ifp = NULL; 4379 int ret = 0; 4380 4381 rcu_read_lock(); 4382 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) { 4383 if (!net_eq(dev_net(ifp->idev->dev), net)) 4384 continue; 4385 if (ipv6_addr_equal(&ifp->addr, addr) && 4386 (ifp->flags & IFA_F_HOMEADDRESS)) { 4387 ret = 1; 4388 break; 4389 } 4390 } 4391 rcu_read_unlock(); 4392 return ret; 4393 } 4394 #endif 4395 4396 /* 4397 * Periodic address status verification 4398 */ 4399 4400 static void addrconf_verify_rtnl(void) 4401 { 4402 unsigned long now, next, next_sec, next_sched; 4403 struct inet6_ifaddr *ifp; 4404 int i; 4405 4406 ASSERT_RTNL(); 4407 4408 rcu_read_lock_bh(); 4409 now = jiffies; 4410 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY); 4411 4412 cancel_delayed_work(&addr_chk_work); 4413 4414 for (i = 0; i < IN6_ADDR_HSIZE; i++) { 4415 restart: 4416 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[i], addr_lst) { 4417 unsigned long age; 4418 4419 /* When setting preferred_lft to a value not zero or 4420 * infinity, while valid_lft is infinity 4421 * IFA_F_PERMANENT has a non-infinity life time. 4422 */ 4423 if ((ifp->flags & IFA_F_PERMANENT) && 4424 (ifp->prefered_lft == INFINITY_LIFE_TIME)) 4425 continue; 4426 4427 spin_lock(&ifp->lock); 4428 /* We try to batch several events at once. */ 4429 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ; 4430 4431 if (ifp->valid_lft != INFINITY_LIFE_TIME && 4432 age >= ifp->valid_lft) { 4433 spin_unlock(&ifp->lock); 4434 in6_ifa_hold(ifp); 4435 ipv6_del_addr(ifp); 4436 goto restart; 4437 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) { 4438 spin_unlock(&ifp->lock); 4439 continue; 4440 } else if (age >= ifp->prefered_lft) { 4441 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */ 4442 int deprecate = 0; 4443 4444 if (!(ifp->flags&IFA_F_DEPRECATED)) { 4445 deprecate = 1; 4446 ifp->flags |= IFA_F_DEPRECATED; 4447 } 4448 4449 if ((ifp->valid_lft != INFINITY_LIFE_TIME) && 4450 (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))) 4451 next = ifp->tstamp + ifp->valid_lft * HZ; 4452 4453 spin_unlock(&ifp->lock); 4454 4455 if (deprecate) { 4456 in6_ifa_hold(ifp); 4457 4458 ipv6_ifa_notify(0, ifp); 4459 in6_ifa_put(ifp); 4460 goto restart; 4461 } 4462 } else if ((ifp->flags&IFA_F_TEMPORARY) && 4463 !(ifp->flags&IFA_F_TENTATIVE)) { 4464 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry * 4465 ifp->idev->cnf.dad_transmits * 4466 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME) / HZ; 4467 4468 if (age >= ifp->prefered_lft - regen_advance) { 4469 struct inet6_ifaddr *ifpub = ifp->ifpub; 4470 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 4471 next = ifp->tstamp + ifp->prefered_lft * HZ; 4472 if (!ifp->regen_count && ifpub) { 4473 ifp->regen_count++; 4474 in6_ifa_hold(ifp); 4475 in6_ifa_hold(ifpub); 4476 spin_unlock(&ifp->lock); 4477 4478 spin_lock(&ifpub->lock); 4479 ifpub->regen_count = 0; 4480 spin_unlock(&ifpub->lock); 4481 rcu_read_unlock_bh(); 4482 ipv6_create_tempaddr(ifpub, ifp, true); 4483 in6_ifa_put(ifpub); 4484 in6_ifa_put(ifp); 4485 rcu_read_lock_bh(); 4486 goto restart; 4487 } 4488 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next)) 4489 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ; 4490 spin_unlock(&ifp->lock); 4491 } else { 4492 /* ifp->prefered_lft <= ifp->valid_lft */ 4493 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 4494 next = ifp->tstamp + ifp->prefered_lft * HZ; 4495 spin_unlock(&ifp->lock); 4496 } 4497 } 4498 } 4499 4500 next_sec = round_jiffies_up(next); 4501 next_sched = next; 4502 4503 /* If rounded timeout is accurate enough, accept it. */ 4504 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ)) 4505 next_sched = next_sec; 4506 4507 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */ 4508 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX)) 4509 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX; 4510 4511 pr_debug("now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n", 4512 now, next, next_sec, next_sched); 4513 mod_delayed_work(addrconf_wq, &addr_chk_work, next_sched - now); 4514 rcu_read_unlock_bh(); 4515 } 4516 4517 static void addrconf_verify_work(struct work_struct *w) 4518 { 4519 rtnl_lock(); 4520 addrconf_verify_rtnl(); 4521 rtnl_unlock(); 4522 } 4523 4524 static void addrconf_verify(void) 4525 { 4526 mod_delayed_work(addrconf_wq, &addr_chk_work, 0); 4527 } 4528 4529 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local, 4530 struct in6_addr **peer_pfx) 4531 { 4532 struct in6_addr *pfx = NULL; 4533 4534 *peer_pfx = NULL; 4535 4536 if (addr) 4537 pfx = nla_data(addr); 4538 4539 if (local) { 4540 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx))) 4541 *peer_pfx = pfx; 4542 pfx = nla_data(local); 4543 } 4544 4545 return pfx; 4546 } 4547 4548 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = { 4549 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) }, 4550 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) }, 4551 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) }, 4552 [IFA_FLAGS] = { .len = sizeof(u32) }, 4553 [IFA_RT_PRIORITY] = { .len = sizeof(u32) }, 4554 [IFA_TARGET_NETNSID] = { .type = NLA_S32 }, 4555 }; 4556 4557 static int 4558 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, 4559 struct netlink_ext_ack *extack) 4560 { 4561 struct net *net = sock_net(skb->sk); 4562 struct ifaddrmsg *ifm; 4563 struct nlattr *tb[IFA_MAX+1]; 4564 struct in6_addr *pfx, *peer_pfx; 4565 u32 ifa_flags; 4566 int err; 4567 4568 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy, 4569 extack); 4570 if (err < 0) 4571 return err; 4572 4573 ifm = nlmsg_data(nlh); 4574 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx); 4575 if (!pfx) 4576 return -EINVAL; 4577 4578 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags; 4579 4580 /* We ignore other flags so far. */ 4581 ifa_flags &= IFA_F_MANAGETEMPADDR; 4582 4583 return inet6_addr_del(net, ifm->ifa_index, ifa_flags, pfx, 4584 ifm->ifa_prefixlen); 4585 } 4586 4587 static int modify_prefix_route(struct inet6_ifaddr *ifp, 4588 unsigned long expires, u32 flags) 4589 { 4590 struct fib6_info *f6i; 4591 u32 prio; 4592 4593 f6i = addrconf_get_prefix_route(&ifp->addr, ifp->prefix_len, 4594 ifp->idev->dev, 0, RTF_DEFAULT, true); 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 false); 5977 if (rt) 5978 ip6_del_rt(net, rt); 5979 } 5980 if (ifp->rt) { 5981 ip6_del_rt(net, ifp->rt); 5982 ifp->rt = NULL; 5983 } 5984 rt_genid_bump_ipv6(net); 5985 break; 5986 } 5987 atomic_inc(&net->ipv6.dev_addr_genid); 5988 } 5989 5990 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 5991 { 5992 rcu_read_lock_bh(); 5993 if (likely(ifp->idev->dead == 0)) 5994 __ipv6_ifa_notify(event, ifp); 5995 rcu_read_unlock_bh(); 5996 } 5997 5998 #ifdef CONFIG_SYSCTL 5999 6000 static 6001 int addrconf_sysctl_forward(struct ctl_table *ctl, int write, 6002 void __user *buffer, size_t *lenp, loff_t *ppos) 6003 { 6004 int *valp = ctl->data; 6005 int val = *valp; 6006 loff_t pos = *ppos; 6007 struct ctl_table lctl; 6008 int ret; 6009 6010 /* 6011 * ctl->data points to idev->cnf.forwarding, we should 6012 * not modify it until we get the rtnl lock. 6013 */ 6014 lctl = *ctl; 6015 lctl.data = &val; 6016 6017 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 6018 6019 if (write) 6020 ret = addrconf_fixup_forwarding(ctl, valp, val); 6021 if (ret) 6022 *ppos = pos; 6023 return ret; 6024 } 6025 6026 static 6027 int addrconf_sysctl_mtu(struct ctl_table *ctl, int write, 6028 void __user *buffer, size_t *lenp, loff_t *ppos) 6029 { 6030 struct inet6_dev *idev = ctl->extra1; 6031 int min_mtu = IPV6_MIN_MTU; 6032 struct ctl_table lctl; 6033 6034 lctl = *ctl; 6035 lctl.extra1 = &min_mtu; 6036 lctl.extra2 = idev ? &idev->dev->mtu : NULL; 6037 6038 return proc_dointvec_minmax(&lctl, write, buffer, lenp, ppos); 6039 } 6040 6041 static void dev_disable_change(struct inet6_dev *idev) 6042 { 6043 struct netdev_notifier_info info; 6044 6045 if (!idev || !idev->dev) 6046 return; 6047 6048 netdev_notifier_info_init(&info, idev->dev); 6049 if (idev->cnf.disable_ipv6) 6050 addrconf_notify(NULL, NETDEV_DOWN, &info); 6051 else 6052 addrconf_notify(NULL, NETDEV_UP, &info); 6053 } 6054 6055 static void addrconf_disable_change(struct net *net, __s32 newf) 6056 { 6057 struct net_device *dev; 6058 struct inet6_dev *idev; 6059 6060 for_each_netdev(net, dev) { 6061 idev = __in6_dev_get(dev); 6062 if (idev) { 6063 int changed = (!idev->cnf.disable_ipv6) ^ (!newf); 6064 idev->cnf.disable_ipv6 = newf; 6065 if (changed) 6066 dev_disable_change(idev); 6067 } 6068 } 6069 } 6070 6071 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf) 6072 { 6073 struct net *net; 6074 int old; 6075 6076 if (!rtnl_trylock()) 6077 return restart_syscall(); 6078 6079 net = (struct net *)table->extra2; 6080 old = *p; 6081 *p = newf; 6082 6083 if (p == &net->ipv6.devconf_dflt->disable_ipv6) { 6084 rtnl_unlock(); 6085 return 0; 6086 } 6087 6088 if (p == &net->ipv6.devconf_all->disable_ipv6) { 6089 net->ipv6.devconf_dflt->disable_ipv6 = newf; 6090 addrconf_disable_change(net, newf); 6091 } else if ((!newf) ^ (!old)) 6092 dev_disable_change((struct inet6_dev *)table->extra1); 6093 6094 rtnl_unlock(); 6095 return 0; 6096 } 6097 6098 static 6099 int addrconf_sysctl_disable(struct ctl_table *ctl, int write, 6100 void __user *buffer, size_t *lenp, loff_t *ppos) 6101 { 6102 int *valp = ctl->data; 6103 int val = *valp; 6104 loff_t pos = *ppos; 6105 struct ctl_table lctl; 6106 int ret; 6107 6108 /* 6109 * ctl->data points to idev->cnf.disable_ipv6, we should 6110 * not modify it until we get the rtnl lock. 6111 */ 6112 lctl = *ctl; 6113 lctl.data = &val; 6114 6115 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 6116 6117 if (write) 6118 ret = addrconf_disable_ipv6(ctl, valp, val); 6119 if (ret) 6120 *ppos = pos; 6121 return ret; 6122 } 6123 6124 static 6125 int addrconf_sysctl_proxy_ndp(struct ctl_table *ctl, int write, 6126 void __user *buffer, size_t *lenp, loff_t *ppos) 6127 { 6128 int *valp = ctl->data; 6129 int ret; 6130 int old, new; 6131 6132 old = *valp; 6133 ret = proc_dointvec(ctl, write, buffer, lenp, ppos); 6134 new = *valp; 6135 6136 if (write && old != new) { 6137 struct net *net = ctl->extra2; 6138 6139 if (!rtnl_trylock()) 6140 return restart_syscall(); 6141 6142 if (valp == &net->ipv6.devconf_dflt->proxy_ndp) 6143 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 6144 NETCONFA_PROXY_NEIGH, 6145 NETCONFA_IFINDEX_DEFAULT, 6146 net->ipv6.devconf_dflt); 6147 else if (valp == &net->ipv6.devconf_all->proxy_ndp) 6148 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 6149 NETCONFA_PROXY_NEIGH, 6150 NETCONFA_IFINDEX_ALL, 6151 net->ipv6.devconf_all); 6152 else { 6153 struct inet6_dev *idev = ctl->extra1; 6154 6155 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 6156 NETCONFA_PROXY_NEIGH, 6157 idev->dev->ifindex, 6158 &idev->cnf); 6159 } 6160 rtnl_unlock(); 6161 } 6162 6163 return ret; 6164 } 6165 6166 static int addrconf_sysctl_addr_gen_mode(struct ctl_table *ctl, int write, 6167 void __user *buffer, size_t *lenp, 6168 loff_t *ppos) 6169 { 6170 int ret = 0; 6171 u32 new_val; 6172 struct inet6_dev *idev = (struct inet6_dev *)ctl->extra1; 6173 struct net *net = (struct net *)ctl->extra2; 6174 struct ctl_table tmp = { 6175 .data = &new_val, 6176 .maxlen = sizeof(new_val), 6177 .mode = ctl->mode, 6178 }; 6179 6180 if (!rtnl_trylock()) 6181 return restart_syscall(); 6182 6183 new_val = *((u32 *)ctl->data); 6184 6185 ret = proc_douintvec(&tmp, write, buffer, lenp, ppos); 6186 if (ret != 0) 6187 goto out; 6188 6189 if (write) { 6190 if (check_addr_gen_mode(new_val) < 0) { 6191 ret = -EINVAL; 6192 goto out; 6193 } 6194 6195 if (idev) { 6196 if (check_stable_privacy(idev, net, new_val) < 0) { 6197 ret = -EINVAL; 6198 goto out; 6199 } 6200 6201 if (idev->cnf.addr_gen_mode != new_val) { 6202 idev->cnf.addr_gen_mode = new_val; 6203 addrconf_dev_config(idev->dev); 6204 } 6205 } else if (&net->ipv6.devconf_all->addr_gen_mode == ctl->data) { 6206 struct net_device *dev; 6207 6208 net->ipv6.devconf_dflt->addr_gen_mode = new_val; 6209 for_each_netdev(net, dev) { 6210 idev = __in6_dev_get(dev); 6211 if (idev && 6212 idev->cnf.addr_gen_mode != new_val) { 6213 idev->cnf.addr_gen_mode = new_val; 6214 addrconf_dev_config(idev->dev); 6215 } 6216 } 6217 } 6218 6219 *((u32 *)ctl->data) = new_val; 6220 } 6221 6222 out: 6223 rtnl_unlock(); 6224 6225 return ret; 6226 } 6227 6228 static int addrconf_sysctl_stable_secret(struct ctl_table *ctl, int write, 6229 void __user *buffer, size_t *lenp, 6230 loff_t *ppos) 6231 { 6232 int err; 6233 struct in6_addr addr; 6234 char str[IPV6_MAX_STRLEN]; 6235 struct ctl_table lctl = *ctl; 6236 struct net *net = ctl->extra2; 6237 struct ipv6_stable_secret *secret = ctl->data; 6238 6239 if (&net->ipv6.devconf_all->stable_secret == ctl->data) 6240 return -EIO; 6241 6242 lctl.maxlen = IPV6_MAX_STRLEN; 6243 lctl.data = str; 6244 6245 if (!rtnl_trylock()) 6246 return restart_syscall(); 6247 6248 if (!write && !secret->initialized) { 6249 err = -EIO; 6250 goto out; 6251 } 6252 6253 err = snprintf(str, sizeof(str), "%pI6", &secret->secret); 6254 if (err >= sizeof(str)) { 6255 err = -EIO; 6256 goto out; 6257 } 6258 6259 err = proc_dostring(&lctl, write, buffer, lenp, ppos); 6260 if (err || !write) 6261 goto out; 6262 6263 if (in6_pton(str, -1, addr.in6_u.u6_addr8, -1, NULL) != 1) { 6264 err = -EIO; 6265 goto out; 6266 } 6267 6268 secret->initialized = true; 6269 secret->secret = addr; 6270 6271 if (&net->ipv6.devconf_dflt->stable_secret == ctl->data) { 6272 struct net_device *dev; 6273 6274 for_each_netdev(net, dev) { 6275 struct inet6_dev *idev = __in6_dev_get(dev); 6276 6277 if (idev) { 6278 idev->cnf.addr_gen_mode = 6279 IN6_ADDR_GEN_MODE_STABLE_PRIVACY; 6280 } 6281 } 6282 } else { 6283 struct inet6_dev *idev = ctl->extra1; 6284 6285 idev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY; 6286 } 6287 6288 out: 6289 rtnl_unlock(); 6290 6291 return err; 6292 } 6293 6294 static 6295 int addrconf_sysctl_ignore_routes_with_linkdown(struct ctl_table *ctl, 6296 int write, 6297 void __user *buffer, 6298 size_t *lenp, 6299 loff_t *ppos) 6300 { 6301 int *valp = ctl->data; 6302 int val = *valp; 6303 loff_t pos = *ppos; 6304 struct ctl_table lctl; 6305 int ret; 6306 6307 /* ctl->data points to idev->cnf.ignore_routes_when_linkdown 6308 * we should not modify it until we get the rtnl lock. 6309 */ 6310 lctl = *ctl; 6311 lctl.data = &val; 6312 6313 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 6314 6315 if (write) 6316 ret = addrconf_fixup_linkdown(ctl, valp, val); 6317 if (ret) 6318 *ppos = pos; 6319 return ret; 6320 } 6321 6322 static 6323 void addrconf_set_nopolicy(struct rt6_info *rt, int action) 6324 { 6325 if (rt) { 6326 if (action) 6327 rt->dst.flags |= DST_NOPOLICY; 6328 else 6329 rt->dst.flags &= ~DST_NOPOLICY; 6330 } 6331 } 6332 6333 static 6334 void addrconf_disable_policy_idev(struct inet6_dev *idev, int val) 6335 { 6336 struct inet6_ifaddr *ifa; 6337 6338 read_lock_bh(&idev->lock); 6339 list_for_each_entry(ifa, &idev->addr_list, if_list) { 6340 spin_lock(&ifa->lock); 6341 if (ifa->rt) { 6342 struct fib6_info *rt = ifa->rt; 6343 int cpu; 6344 6345 rcu_read_lock(); 6346 ifa->rt->dst_nopolicy = val ? true : false; 6347 if (rt->rt6i_pcpu) { 6348 for_each_possible_cpu(cpu) { 6349 struct rt6_info **rtp; 6350 6351 rtp = per_cpu_ptr(rt->rt6i_pcpu, cpu); 6352 addrconf_set_nopolicy(*rtp, val); 6353 } 6354 } 6355 rcu_read_unlock(); 6356 } 6357 spin_unlock(&ifa->lock); 6358 } 6359 read_unlock_bh(&idev->lock); 6360 } 6361 6362 static 6363 int addrconf_disable_policy(struct ctl_table *ctl, int *valp, int val) 6364 { 6365 struct inet6_dev *idev; 6366 struct net *net; 6367 6368 if (!rtnl_trylock()) 6369 return restart_syscall(); 6370 6371 *valp = val; 6372 6373 net = (struct net *)ctl->extra2; 6374 if (valp == &net->ipv6.devconf_dflt->disable_policy) { 6375 rtnl_unlock(); 6376 return 0; 6377 } 6378 6379 if (valp == &net->ipv6.devconf_all->disable_policy) { 6380 struct net_device *dev; 6381 6382 for_each_netdev(net, dev) { 6383 idev = __in6_dev_get(dev); 6384 if (idev) 6385 addrconf_disable_policy_idev(idev, val); 6386 } 6387 } else { 6388 idev = (struct inet6_dev *)ctl->extra1; 6389 addrconf_disable_policy_idev(idev, val); 6390 } 6391 6392 rtnl_unlock(); 6393 return 0; 6394 } 6395 6396 static 6397 int addrconf_sysctl_disable_policy(struct ctl_table *ctl, int write, 6398 void __user *buffer, size_t *lenp, 6399 loff_t *ppos) 6400 { 6401 int *valp = ctl->data; 6402 int val = *valp; 6403 loff_t pos = *ppos; 6404 struct ctl_table lctl; 6405 int ret; 6406 6407 lctl = *ctl; 6408 lctl.data = &val; 6409 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 6410 6411 if (write && (*valp != val)) 6412 ret = addrconf_disable_policy(ctl, valp, val); 6413 6414 if (ret) 6415 *ppos = pos; 6416 6417 return ret; 6418 } 6419 6420 static int minus_one = -1; 6421 static const int zero = 0; 6422 static const int one = 1; 6423 static const int two_five_five = 255; 6424 6425 static const struct ctl_table addrconf_sysctl[] = { 6426 { 6427 .procname = "forwarding", 6428 .data = &ipv6_devconf.forwarding, 6429 .maxlen = sizeof(int), 6430 .mode = 0644, 6431 .proc_handler = addrconf_sysctl_forward, 6432 }, 6433 { 6434 .procname = "hop_limit", 6435 .data = &ipv6_devconf.hop_limit, 6436 .maxlen = sizeof(int), 6437 .mode = 0644, 6438 .proc_handler = proc_dointvec_minmax, 6439 .extra1 = (void *)&one, 6440 .extra2 = (void *)&two_five_five, 6441 }, 6442 { 6443 .procname = "mtu", 6444 .data = &ipv6_devconf.mtu6, 6445 .maxlen = sizeof(int), 6446 .mode = 0644, 6447 .proc_handler = addrconf_sysctl_mtu, 6448 }, 6449 { 6450 .procname = "accept_ra", 6451 .data = &ipv6_devconf.accept_ra, 6452 .maxlen = sizeof(int), 6453 .mode = 0644, 6454 .proc_handler = proc_dointvec, 6455 }, 6456 { 6457 .procname = "accept_redirects", 6458 .data = &ipv6_devconf.accept_redirects, 6459 .maxlen = sizeof(int), 6460 .mode = 0644, 6461 .proc_handler = proc_dointvec, 6462 }, 6463 { 6464 .procname = "autoconf", 6465 .data = &ipv6_devconf.autoconf, 6466 .maxlen = sizeof(int), 6467 .mode = 0644, 6468 .proc_handler = proc_dointvec, 6469 }, 6470 { 6471 .procname = "dad_transmits", 6472 .data = &ipv6_devconf.dad_transmits, 6473 .maxlen = sizeof(int), 6474 .mode = 0644, 6475 .proc_handler = proc_dointvec, 6476 }, 6477 { 6478 .procname = "router_solicitations", 6479 .data = &ipv6_devconf.rtr_solicits, 6480 .maxlen = sizeof(int), 6481 .mode = 0644, 6482 .proc_handler = proc_dointvec_minmax, 6483 .extra1 = &minus_one, 6484 }, 6485 { 6486 .procname = "router_solicitation_interval", 6487 .data = &ipv6_devconf.rtr_solicit_interval, 6488 .maxlen = sizeof(int), 6489 .mode = 0644, 6490 .proc_handler = proc_dointvec_jiffies, 6491 }, 6492 { 6493 .procname = "router_solicitation_max_interval", 6494 .data = &ipv6_devconf.rtr_solicit_max_interval, 6495 .maxlen = sizeof(int), 6496 .mode = 0644, 6497 .proc_handler = proc_dointvec_jiffies, 6498 }, 6499 { 6500 .procname = "router_solicitation_delay", 6501 .data = &ipv6_devconf.rtr_solicit_delay, 6502 .maxlen = sizeof(int), 6503 .mode = 0644, 6504 .proc_handler = proc_dointvec_jiffies, 6505 }, 6506 { 6507 .procname = "force_mld_version", 6508 .data = &ipv6_devconf.force_mld_version, 6509 .maxlen = sizeof(int), 6510 .mode = 0644, 6511 .proc_handler = proc_dointvec, 6512 }, 6513 { 6514 .procname = "mldv1_unsolicited_report_interval", 6515 .data = 6516 &ipv6_devconf.mldv1_unsolicited_report_interval, 6517 .maxlen = sizeof(int), 6518 .mode = 0644, 6519 .proc_handler = proc_dointvec_ms_jiffies, 6520 }, 6521 { 6522 .procname = "mldv2_unsolicited_report_interval", 6523 .data = 6524 &ipv6_devconf.mldv2_unsolicited_report_interval, 6525 .maxlen = sizeof(int), 6526 .mode = 0644, 6527 .proc_handler = proc_dointvec_ms_jiffies, 6528 }, 6529 { 6530 .procname = "use_tempaddr", 6531 .data = &ipv6_devconf.use_tempaddr, 6532 .maxlen = sizeof(int), 6533 .mode = 0644, 6534 .proc_handler = proc_dointvec, 6535 }, 6536 { 6537 .procname = "temp_valid_lft", 6538 .data = &ipv6_devconf.temp_valid_lft, 6539 .maxlen = sizeof(int), 6540 .mode = 0644, 6541 .proc_handler = proc_dointvec, 6542 }, 6543 { 6544 .procname = "temp_prefered_lft", 6545 .data = &ipv6_devconf.temp_prefered_lft, 6546 .maxlen = sizeof(int), 6547 .mode = 0644, 6548 .proc_handler = proc_dointvec, 6549 }, 6550 { 6551 .procname = "regen_max_retry", 6552 .data = &ipv6_devconf.regen_max_retry, 6553 .maxlen = sizeof(int), 6554 .mode = 0644, 6555 .proc_handler = proc_dointvec, 6556 }, 6557 { 6558 .procname = "max_desync_factor", 6559 .data = &ipv6_devconf.max_desync_factor, 6560 .maxlen = sizeof(int), 6561 .mode = 0644, 6562 .proc_handler = proc_dointvec, 6563 }, 6564 { 6565 .procname = "max_addresses", 6566 .data = &ipv6_devconf.max_addresses, 6567 .maxlen = sizeof(int), 6568 .mode = 0644, 6569 .proc_handler = proc_dointvec, 6570 }, 6571 { 6572 .procname = "accept_ra_defrtr", 6573 .data = &ipv6_devconf.accept_ra_defrtr, 6574 .maxlen = sizeof(int), 6575 .mode = 0644, 6576 .proc_handler = proc_dointvec, 6577 }, 6578 { 6579 .procname = "accept_ra_min_hop_limit", 6580 .data = &ipv6_devconf.accept_ra_min_hop_limit, 6581 .maxlen = sizeof(int), 6582 .mode = 0644, 6583 .proc_handler = proc_dointvec, 6584 }, 6585 { 6586 .procname = "accept_ra_pinfo", 6587 .data = &ipv6_devconf.accept_ra_pinfo, 6588 .maxlen = sizeof(int), 6589 .mode = 0644, 6590 .proc_handler = proc_dointvec, 6591 }, 6592 #ifdef CONFIG_IPV6_ROUTER_PREF 6593 { 6594 .procname = "accept_ra_rtr_pref", 6595 .data = &ipv6_devconf.accept_ra_rtr_pref, 6596 .maxlen = sizeof(int), 6597 .mode = 0644, 6598 .proc_handler = proc_dointvec, 6599 }, 6600 { 6601 .procname = "router_probe_interval", 6602 .data = &ipv6_devconf.rtr_probe_interval, 6603 .maxlen = sizeof(int), 6604 .mode = 0644, 6605 .proc_handler = proc_dointvec_jiffies, 6606 }, 6607 #ifdef CONFIG_IPV6_ROUTE_INFO 6608 { 6609 .procname = "accept_ra_rt_info_min_plen", 6610 .data = &ipv6_devconf.accept_ra_rt_info_min_plen, 6611 .maxlen = sizeof(int), 6612 .mode = 0644, 6613 .proc_handler = proc_dointvec, 6614 }, 6615 { 6616 .procname = "accept_ra_rt_info_max_plen", 6617 .data = &ipv6_devconf.accept_ra_rt_info_max_plen, 6618 .maxlen = sizeof(int), 6619 .mode = 0644, 6620 .proc_handler = proc_dointvec, 6621 }, 6622 #endif 6623 #endif 6624 { 6625 .procname = "proxy_ndp", 6626 .data = &ipv6_devconf.proxy_ndp, 6627 .maxlen = sizeof(int), 6628 .mode = 0644, 6629 .proc_handler = addrconf_sysctl_proxy_ndp, 6630 }, 6631 { 6632 .procname = "accept_source_route", 6633 .data = &ipv6_devconf.accept_source_route, 6634 .maxlen = sizeof(int), 6635 .mode = 0644, 6636 .proc_handler = proc_dointvec, 6637 }, 6638 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 6639 { 6640 .procname = "optimistic_dad", 6641 .data = &ipv6_devconf.optimistic_dad, 6642 .maxlen = sizeof(int), 6643 .mode = 0644, 6644 .proc_handler = proc_dointvec, 6645 }, 6646 { 6647 .procname = "use_optimistic", 6648 .data = &ipv6_devconf.use_optimistic, 6649 .maxlen = sizeof(int), 6650 .mode = 0644, 6651 .proc_handler = proc_dointvec, 6652 }, 6653 #endif 6654 #ifdef CONFIG_IPV6_MROUTE 6655 { 6656 .procname = "mc_forwarding", 6657 .data = &ipv6_devconf.mc_forwarding, 6658 .maxlen = sizeof(int), 6659 .mode = 0444, 6660 .proc_handler = proc_dointvec, 6661 }, 6662 #endif 6663 { 6664 .procname = "disable_ipv6", 6665 .data = &ipv6_devconf.disable_ipv6, 6666 .maxlen = sizeof(int), 6667 .mode = 0644, 6668 .proc_handler = addrconf_sysctl_disable, 6669 }, 6670 { 6671 .procname = "accept_dad", 6672 .data = &ipv6_devconf.accept_dad, 6673 .maxlen = sizeof(int), 6674 .mode = 0644, 6675 .proc_handler = proc_dointvec, 6676 }, 6677 { 6678 .procname = "force_tllao", 6679 .data = &ipv6_devconf.force_tllao, 6680 .maxlen = sizeof(int), 6681 .mode = 0644, 6682 .proc_handler = proc_dointvec 6683 }, 6684 { 6685 .procname = "ndisc_notify", 6686 .data = &ipv6_devconf.ndisc_notify, 6687 .maxlen = sizeof(int), 6688 .mode = 0644, 6689 .proc_handler = proc_dointvec 6690 }, 6691 { 6692 .procname = "suppress_frag_ndisc", 6693 .data = &ipv6_devconf.suppress_frag_ndisc, 6694 .maxlen = sizeof(int), 6695 .mode = 0644, 6696 .proc_handler = proc_dointvec 6697 }, 6698 { 6699 .procname = "accept_ra_from_local", 6700 .data = &ipv6_devconf.accept_ra_from_local, 6701 .maxlen = sizeof(int), 6702 .mode = 0644, 6703 .proc_handler = proc_dointvec, 6704 }, 6705 { 6706 .procname = "accept_ra_mtu", 6707 .data = &ipv6_devconf.accept_ra_mtu, 6708 .maxlen = sizeof(int), 6709 .mode = 0644, 6710 .proc_handler = proc_dointvec, 6711 }, 6712 { 6713 .procname = "stable_secret", 6714 .data = &ipv6_devconf.stable_secret, 6715 .maxlen = IPV6_MAX_STRLEN, 6716 .mode = 0600, 6717 .proc_handler = addrconf_sysctl_stable_secret, 6718 }, 6719 { 6720 .procname = "use_oif_addrs_only", 6721 .data = &ipv6_devconf.use_oif_addrs_only, 6722 .maxlen = sizeof(int), 6723 .mode = 0644, 6724 .proc_handler = proc_dointvec, 6725 }, 6726 { 6727 .procname = "ignore_routes_with_linkdown", 6728 .data = &ipv6_devconf.ignore_routes_with_linkdown, 6729 .maxlen = sizeof(int), 6730 .mode = 0644, 6731 .proc_handler = addrconf_sysctl_ignore_routes_with_linkdown, 6732 }, 6733 { 6734 .procname = "drop_unicast_in_l2_multicast", 6735 .data = &ipv6_devconf.drop_unicast_in_l2_multicast, 6736 .maxlen = sizeof(int), 6737 .mode = 0644, 6738 .proc_handler = proc_dointvec, 6739 }, 6740 { 6741 .procname = "drop_unsolicited_na", 6742 .data = &ipv6_devconf.drop_unsolicited_na, 6743 .maxlen = sizeof(int), 6744 .mode = 0644, 6745 .proc_handler = proc_dointvec, 6746 }, 6747 { 6748 .procname = "keep_addr_on_down", 6749 .data = &ipv6_devconf.keep_addr_on_down, 6750 .maxlen = sizeof(int), 6751 .mode = 0644, 6752 .proc_handler = proc_dointvec, 6753 6754 }, 6755 { 6756 .procname = "seg6_enabled", 6757 .data = &ipv6_devconf.seg6_enabled, 6758 .maxlen = sizeof(int), 6759 .mode = 0644, 6760 .proc_handler = proc_dointvec, 6761 }, 6762 #ifdef CONFIG_IPV6_SEG6_HMAC 6763 { 6764 .procname = "seg6_require_hmac", 6765 .data = &ipv6_devconf.seg6_require_hmac, 6766 .maxlen = sizeof(int), 6767 .mode = 0644, 6768 .proc_handler = proc_dointvec, 6769 }, 6770 #endif 6771 { 6772 .procname = "enhanced_dad", 6773 .data = &ipv6_devconf.enhanced_dad, 6774 .maxlen = sizeof(int), 6775 .mode = 0644, 6776 .proc_handler = proc_dointvec, 6777 }, 6778 { 6779 .procname = "addr_gen_mode", 6780 .data = &ipv6_devconf.addr_gen_mode, 6781 .maxlen = sizeof(int), 6782 .mode = 0644, 6783 .proc_handler = addrconf_sysctl_addr_gen_mode, 6784 }, 6785 { 6786 .procname = "disable_policy", 6787 .data = &ipv6_devconf.disable_policy, 6788 .maxlen = sizeof(int), 6789 .mode = 0644, 6790 .proc_handler = addrconf_sysctl_disable_policy, 6791 }, 6792 { 6793 .procname = "ndisc_tclass", 6794 .data = &ipv6_devconf.ndisc_tclass, 6795 .maxlen = sizeof(int), 6796 .mode = 0644, 6797 .proc_handler = proc_dointvec_minmax, 6798 .extra1 = (void *)&zero, 6799 .extra2 = (void *)&two_five_five, 6800 }, 6801 { 6802 /* sentinel */ 6803 } 6804 }; 6805 6806 static int __addrconf_sysctl_register(struct net *net, char *dev_name, 6807 struct inet6_dev *idev, struct ipv6_devconf *p) 6808 { 6809 int i, ifindex; 6810 struct ctl_table *table; 6811 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ]; 6812 6813 table = kmemdup(addrconf_sysctl, sizeof(addrconf_sysctl), GFP_KERNEL); 6814 if (!table) 6815 goto out; 6816 6817 for (i = 0; table[i].data; i++) { 6818 table[i].data += (char *)p - (char *)&ipv6_devconf; 6819 /* If one of these is already set, then it is not safe to 6820 * overwrite either of them: this makes proc_dointvec_minmax 6821 * usable. 6822 */ 6823 if (!table[i].extra1 && !table[i].extra2) { 6824 table[i].extra1 = idev; /* embedded; no ref */ 6825 table[i].extra2 = net; 6826 } 6827 } 6828 6829 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name); 6830 6831 p->sysctl_header = register_net_sysctl(net, path, table); 6832 if (!p->sysctl_header) 6833 goto free; 6834 6835 if (!strcmp(dev_name, "all")) 6836 ifindex = NETCONFA_IFINDEX_ALL; 6837 else if (!strcmp(dev_name, "default")) 6838 ifindex = NETCONFA_IFINDEX_DEFAULT; 6839 else 6840 ifindex = idev->dev->ifindex; 6841 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, NETCONFA_ALL, 6842 ifindex, p); 6843 return 0; 6844 6845 free: 6846 kfree(table); 6847 out: 6848 return -ENOBUFS; 6849 } 6850 6851 static void __addrconf_sysctl_unregister(struct net *net, 6852 struct ipv6_devconf *p, int ifindex) 6853 { 6854 struct ctl_table *table; 6855 6856 if (!p->sysctl_header) 6857 return; 6858 6859 table = p->sysctl_header->ctl_table_arg; 6860 unregister_net_sysctl_table(p->sysctl_header); 6861 p->sysctl_header = NULL; 6862 kfree(table); 6863 6864 inet6_netconf_notify_devconf(net, RTM_DELNETCONF, 0, ifindex, NULL); 6865 } 6866 6867 static int addrconf_sysctl_register(struct inet6_dev *idev) 6868 { 6869 int err; 6870 6871 if (!sysctl_dev_name_is_allowed(idev->dev->name)) 6872 return -EINVAL; 6873 6874 err = neigh_sysctl_register(idev->dev, idev->nd_parms, 6875 &ndisc_ifinfo_sysctl_change); 6876 if (err) 6877 return err; 6878 err = __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name, 6879 idev, &idev->cnf); 6880 if (err) 6881 neigh_sysctl_unregister(idev->nd_parms); 6882 6883 return err; 6884 } 6885 6886 static void addrconf_sysctl_unregister(struct inet6_dev *idev) 6887 { 6888 __addrconf_sysctl_unregister(dev_net(idev->dev), &idev->cnf, 6889 idev->dev->ifindex); 6890 neigh_sysctl_unregister(idev->nd_parms); 6891 } 6892 6893 6894 #endif 6895 6896 static int __net_init addrconf_init_net(struct net *net) 6897 { 6898 int err = -ENOMEM; 6899 struct ipv6_devconf *all, *dflt; 6900 6901 all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL); 6902 if (!all) 6903 goto err_alloc_all; 6904 6905 dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL); 6906 if (!dflt) 6907 goto err_alloc_dflt; 6908 6909 if (IS_ENABLED(CONFIG_SYSCTL) && 6910 sysctl_devconf_inherit_init_net == 1 && !net_eq(net, &init_net)) { 6911 memcpy(all, init_net.ipv6.devconf_all, sizeof(ipv6_devconf)); 6912 memcpy(dflt, init_net.ipv6.devconf_dflt, sizeof(ipv6_devconf_dflt)); 6913 } 6914 6915 /* these will be inherited by all namespaces */ 6916 dflt->autoconf = ipv6_defaults.autoconf; 6917 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6; 6918 6919 dflt->stable_secret.initialized = false; 6920 all->stable_secret.initialized = false; 6921 6922 net->ipv6.devconf_all = all; 6923 net->ipv6.devconf_dflt = dflt; 6924 6925 #ifdef CONFIG_SYSCTL 6926 err = __addrconf_sysctl_register(net, "all", NULL, all); 6927 if (err < 0) 6928 goto err_reg_all; 6929 6930 err = __addrconf_sysctl_register(net, "default", NULL, dflt); 6931 if (err < 0) 6932 goto err_reg_dflt; 6933 #endif 6934 return 0; 6935 6936 #ifdef CONFIG_SYSCTL 6937 err_reg_dflt: 6938 __addrconf_sysctl_unregister(net, all, NETCONFA_IFINDEX_ALL); 6939 err_reg_all: 6940 kfree(dflt); 6941 #endif 6942 err_alloc_dflt: 6943 kfree(all); 6944 err_alloc_all: 6945 return err; 6946 } 6947 6948 static void __net_exit addrconf_exit_net(struct net *net) 6949 { 6950 #ifdef CONFIG_SYSCTL 6951 __addrconf_sysctl_unregister(net, net->ipv6.devconf_dflt, 6952 NETCONFA_IFINDEX_DEFAULT); 6953 __addrconf_sysctl_unregister(net, net->ipv6.devconf_all, 6954 NETCONFA_IFINDEX_ALL); 6955 #endif 6956 kfree(net->ipv6.devconf_dflt); 6957 kfree(net->ipv6.devconf_all); 6958 } 6959 6960 static struct pernet_operations addrconf_ops = { 6961 .init = addrconf_init_net, 6962 .exit = addrconf_exit_net, 6963 }; 6964 6965 static struct rtnl_af_ops inet6_ops __read_mostly = { 6966 .family = AF_INET6, 6967 .fill_link_af = inet6_fill_link_af, 6968 .get_link_af_size = inet6_get_link_af_size, 6969 .validate_link_af = inet6_validate_link_af, 6970 .set_link_af = inet6_set_link_af, 6971 }; 6972 6973 /* 6974 * Init / cleanup code 6975 */ 6976 6977 int __init addrconf_init(void) 6978 { 6979 struct inet6_dev *idev; 6980 int i, err; 6981 6982 err = ipv6_addr_label_init(); 6983 if (err < 0) { 6984 pr_crit("%s: cannot initialize default policy table: %d\n", 6985 __func__, err); 6986 goto out; 6987 } 6988 6989 err = register_pernet_subsys(&addrconf_ops); 6990 if (err < 0) 6991 goto out_addrlabel; 6992 6993 addrconf_wq = create_workqueue("ipv6_addrconf"); 6994 if (!addrconf_wq) { 6995 err = -ENOMEM; 6996 goto out_nowq; 6997 } 6998 6999 /* The addrconf netdev notifier requires that loopback_dev 7000 * has it's ipv6 private information allocated and setup 7001 * before it can bring up and give link-local addresses 7002 * to other devices which are up. 7003 * 7004 * Unfortunately, loopback_dev is not necessarily the first 7005 * entry in the global dev_base list of net devices. In fact, 7006 * it is likely to be the very last entry on that list. 7007 * So this causes the notifier registry below to try and 7008 * give link-local addresses to all devices besides loopback_dev 7009 * first, then loopback_dev, which cases all the non-loopback_dev 7010 * devices to fail to get a link-local address. 7011 * 7012 * So, as a temporary fix, allocate the ipv6 structure for 7013 * loopback_dev first by hand. 7014 * Longer term, all of the dependencies ipv6 has upon the loopback 7015 * device and it being up should be removed. 7016 */ 7017 rtnl_lock(); 7018 idev = ipv6_add_dev(init_net.loopback_dev); 7019 rtnl_unlock(); 7020 if (IS_ERR(idev)) { 7021 err = PTR_ERR(idev); 7022 goto errlo; 7023 } 7024 7025 ip6_route_init_special_entries(); 7026 7027 for (i = 0; i < IN6_ADDR_HSIZE; i++) 7028 INIT_HLIST_HEAD(&inet6_addr_lst[i]); 7029 7030 register_netdevice_notifier(&ipv6_dev_notf); 7031 7032 addrconf_verify(); 7033 7034 rtnl_af_register(&inet6_ops); 7035 7036 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETLINK, 7037 NULL, inet6_dump_ifinfo, 0); 7038 if (err < 0) 7039 goto errout; 7040 7041 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_NEWADDR, 7042 inet6_rtm_newaddr, NULL, 0); 7043 if (err < 0) 7044 goto errout; 7045 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_DELADDR, 7046 inet6_rtm_deladdr, NULL, 0); 7047 if (err < 0) 7048 goto errout; 7049 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETADDR, 7050 inet6_rtm_getaddr, inet6_dump_ifaddr, 7051 RTNL_FLAG_DOIT_UNLOCKED); 7052 if (err < 0) 7053 goto errout; 7054 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETMULTICAST, 7055 NULL, inet6_dump_ifmcaddr, 0); 7056 if (err < 0) 7057 goto errout; 7058 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETANYCAST, 7059 NULL, inet6_dump_ifacaddr, 0); 7060 if (err < 0) 7061 goto errout; 7062 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETNETCONF, 7063 inet6_netconf_get_devconf, 7064 inet6_netconf_dump_devconf, 7065 RTNL_FLAG_DOIT_UNLOCKED); 7066 if (err < 0) 7067 goto errout; 7068 err = ipv6_addr_label_rtnl_register(); 7069 if (err < 0) 7070 goto errout; 7071 7072 return 0; 7073 errout: 7074 rtnl_unregister_all(PF_INET6); 7075 rtnl_af_unregister(&inet6_ops); 7076 unregister_netdevice_notifier(&ipv6_dev_notf); 7077 errlo: 7078 destroy_workqueue(addrconf_wq); 7079 out_nowq: 7080 unregister_pernet_subsys(&addrconf_ops); 7081 out_addrlabel: 7082 ipv6_addr_label_cleanup(); 7083 out: 7084 return err; 7085 } 7086 7087 void addrconf_cleanup(void) 7088 { 7089 struct net_device *dev; 7090 int i; 7091 7092 unregister_netdevice_notifier(&ipv6_dev_notf); 7093 unregister_pernet_subsys(&addrconf_ops); 7094 ipv6_addr_label_cleanup(); 7095 7096 rtnl_af_unregister(&inet6_ops); 7097 7098 rtnl_lock(); 7099 7100 /* clean dev list */ 7101 for_each_netdev(&init_net, dev) { 7102 if (__in6_dev_get(dev) == NULL) 7103 continue; 7104 addrconf_ifdown(dev, 1); 7105 } 7106 addrconf_ifdown(init_net.loopback_dev, 2); 7107 7108 /* 7109 * Check hash table. 7110 */ 7111 spin_lock_bh(&addrconf_hash_lock); 7112 for (i = 0; i < IN6_ADDR_HSIZE; i++) 7113 WARN_ON(!hlist_empty(&inet6_addr_lst[i])); 7114 spin_unlock_bh(&addrconf_hash_lock); 7115 cancel_delayed_work(&addr_chk_work); 7116 rtnl_unlock(); 7117 7118 destroy_workqueue(addrconf_wq); 7119 } 7120