1 /* 2 * IPv6 Address [auto]configuration 3 * Linux INET6 implementation 4 * 5 * Authors: 6 * Pedro Roque <roque@di.fc.ul.pt> 7 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru> 8 * 9 * This program is free software; you can redistribute it and/or 10 * modify it under the terms of the GNU General Public License 11 * as published by the Free Software Foundation; either version 12 * 2 of the License, or (at your option) any later version. 13 */ 14 15 /* 16 * Changes: 17 * 18 * Janos Farkas : delete timer on ifdown 19 * <chexum@bankinf.banki.hu> 20 * Andi Kleen : kill double kfree on module 21 * unload. 22 * Maciej W. Rozycki : FDDI support 23 * sekiya@USAGI : Don't send too many RS 24 * packets. 25 * yoshfuji@USAGI : Fixed interval between DAD 26 * packets. 27 * YOSHIFUJI Hideaki @USAGI : improved accuracy of 28 * address validation timer. 29 * YOSHIFUJI Hideaki @USAGI : Privacy Extensions (RFC3041) 30 * support. 31 * Yuji SEKIYA @USAGI : Don't assign a same IPv6 32 * address on a same interface. 33 * YOSHIFUJI Hideaki @USAGI : ARCnet support 34 * YOSHIFUJI Hideaki @USAGI : convert /proc/net/if_inet6 to 35 * seq_file. 36 * YOSHIFUJI Hideaki @USAGI : improved source address 37 * selection; consider scope, 38 * status etc. 39 */ 40 41 #define pr_fmt(fmt) "IPv6: " fmt 42 43 #include <linux/errno.h> 44 #include <linux/types.h> 45 #include <linux/kernel.h> 46 #include <linux/sched/signal.h> 47 #include <linux/socket.h> 48 #include <linux/sockios.h> 49 #include <linux/net.h> 50 #include <linux/inet.h> 51 #include <linux/in6.h> 52 #include <linux/netdevice.h> 53 #include <linux/if_addr.h> 54 #include <linux/if_arp.h> 55 #include <linux/if_arcnet.h> 56 #include <linux/if_infiniband.h> 57 #include <linux/route.h> 58 #include <linux/inetdevice.h> 59 #include <linux/init.h> 60 #include <linux/slab.h> 61 #ifdef CONFIG_SYSCTL 62 #include <linux/sysctl.h> 63 #endif 64 #include <linux/capability.h> 65 #include <linux/delay.h> 66 #include <linux/notifier.h> 67 #include <linux/string.h> 68 #include <linux/hash.h> 69 70 #include <net/net_namespace.h> 71 #include <net/sock.h> 72 #include <net/snmp.h> 73 74 #include <net/6lowpan.h> 75 #include <net/firewire.h> 76 #include <net/ipv6.h> 77 #include <net/protocol.h> 78 #include <net/ndisc.h> 79 #include <net/ip6_route.h> 80 #include <net/addrconf.h> 81 #include <net/tcp.h> 82 #include <net/ip.h> 83 #include <net/netlink.h> 84 #include <net/pkt_sched.h> 85 #include <net/l3mdev.h> 86 #include <linux/if_tunnel.h> 87 #include <linux/rtnetlink.h> 88 #include <linux/netconf.h> 89 #include <linux/random.h> 90 #include <linux/uaccess.h> 91 #include <asm/unaligned.h> 92 93 #include <linux/proc_fs.h> 94 #include <linux/seq_file.h> 95 #include <linux/export.h> 96 97 #define INFINITY_LIFE_TIME 0xFFFFFFFF 98 99 #define IPV6_MAX_STRLEN \ 100 sizeof("ffff:ffff:ffff:ffff:ffff:ffff:255.255.255.255") 101 102 static inline u32 cstamp_delta(unsigned long cstamp) 103 { 104 return (cstamp - INITIAL_JIFFIES) * 100UL / HZ; 105 } 106 107 static inline s32 rfc3315_s14_backoff_init(s32 irt) 108 { 109 /* multiply 'initial retransmission time' by 0.9 .. 1.1 */ 110 u64 tmp = (900000 + prandom_u32() % 200001) * (u64)irt; 111 do_div(tmp, 1000000); 112 return (s32)tmp; 113 } 114 115 static inline s32 rfc3315_s14_backoff_update(s32 rt, s32 mrt) 116 { 117 /* multiply 'retransmission timeout' by 1.9 .. 2.1 */ 118 u64 tmp = (1900000 + prandom_u32() % 200001) * (u64)rt; 119 do_div(tmp, 1000000); 120 if ((s32)tmp > mrt) { 121 /* multiply 'maximum retransmission time' by 0.9 .. 1.1 */ 122 tmp = (900000 + prandom_u32() % 200001) * (u64)mrt; 123 do_div(tmp, 1000000); 124 } 125 return (s32)tmp; 126 } 127 128 #ifdef CONFIG_SYSCTL 129 static int addrconf_sysctl_register(struct inet6_dev *idev); 130 static void addrconf_sysctl_unregister(struct inet6_dev *idev); 131 #else 132 static inline int addrconf_sysctl_register(struct inet6_dev *idev) 133 { 134 return 0; 135 } 136 137 static inline void addrconf_sysctl_unregister(struct inet6_dev *idev) 138 { 139 } 140 #endif 141 142 static void ipv6_regen_rndid(struct inet6_dev *idev); 143 static void ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr); 144 145 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev); 146 static int ipv6_count_addresses(const struct inet6_dev *idev); 147 static int ipv6_generate_stable_address(struct in6_addr *addr, 148 u8 dad_count, 149 const struct inet6_dev *idev); 150 151 #define IN6_ADDR_HSIZE_SHIFT 8 152 #define IN6_ADDR_HSIZE (1 << IN6_ADDR_HSIZE_SHIFT) 153 /* 154 * Configured unicast address hash table 155 */ 156 static struct hlist_head inet6_addr_lst[IN6_ADDR_HSIZE]; 157 static DEFINE_SPINLOCK(addrconf_hash_lock); 158 159 static void addrconf_verify(void); 160 static void addrconf_verify_rtnl(void); 161 static void addrconf_verify_work(struct work_struct *); 162 163 static struct workqueue_struct *addrconf_wq; 164 static DECLARE_DELAYED_WORK(addr_chk_work, addrconf_verify_work); 165 166 static void addrconf_join_anycast(struct inet6_ifaddr *ifp); 167 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp); 168 169 static void addrconf_type_change(struct net_device *dev, 170 unsigned long event); 171 static int addrconf_ifdown(struct net_device *dev, int how); 172 173 static struct fib6_info *addrconf_get_prefix_route(const struct in6_addr *pfx, 174 int plen, 175 const struct net_device *dev, 176 u32 flags, u32 noflags); 177 178 static void addrconf_dad_start(struct inet6_ifaddr *ifp); 179 static void addrconf_dad_work(struct work_struct *w); 180 static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id, 181 bool send_na); 182 static void addrconf_dad_run(struct inet6_dev *idev, bool restart); 183 static void addrconf_rs_timer(struct timer_list *t); 184 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa); 185 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa); 186 187 static void inet6_prefix_notify(int event, struct inet6_dev *idev, 188 struct prefix_info *pinfo); 189 190 static struct ipv6_devconf ipv6_devconf __read_mostly = { 191 .forwarding = 0, 192 .hop_limit = IPV6_DEFAULT_HOPLIMIT, 193 .mtu6 = IPV6_MIN_MTU, 194 .accept_ra = 1, 195 .accept_redirects = 1, 196 .autoconf = 1, 197 .force_mld_version = 0, 198 .mldv1_unsolicited_report_interval = 10 * HZ, 199 .mldv2_unsolicited_report_interval = HZ, 200 .dad_transmits = 1, 201 .rtr_solicits = MAX_RTR_SOLICITATIONS, 202 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL, 203 .rtr_solicit_max_interval = RTR_SOLICITATION_MAX_INTERVAL, 204 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY, 205 .use_tempaddr = 0, 206 .temp_valid_lft = TEMP_VALID_LIFETIME, 207 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME, 208 .regen_max_retry = REGEN_MAX_RETRY, 209 .max_desync_factor = MAX_DESYNC_FACTOR, 210 .max_addresses = IPV6_MAX_ADDRESSES, 211 .accept_ra_defrtr = 1, 212 .accept_ra_from_local = 0, 213 .accept_ra_min_hop_limit= 1, 214 .accept_ra_pinfo = 1, 215 #ifdef CONFIG_IPV6_ROUTER_PREF 216 .accept_ra_rtr_pref = 1, 217 .rtr_probe_interval = 60 * HZ, 218 #ifdef CONFIG_IPV6_ROUTE_INFO 219 .accept_ra_rt_info_min_plen = 0, 220 .accept_ra_rt_info_max_plen = 0, 221 #endif 222 #endif 223 .proxy_ndp = 0, 224 .accept_source_route = 0, /* we do not accept RH0 by default. */ 225 .disable_ipv6 = 0, 226 .accept_dad = 0, 227 .suppress_frag_ndisc = 1, 228 .accept_ra_mtu = 1, 229 .stable_secret = { 230 .initialized = false, 231 }, 232 .use_oif_addrs_only = 0, 233 .ignore_routes_with_linkdown = 0, 234 .keep_addr_on_down = 0, 235 .seg6_enabled = 0, 236 #ifdef CONFIG_IPV6_SEG6_HMAC 237 .seg6_require_hmac = 0, 238 #endif 239 .enhanced_dad = 1, 240 .addr_gen_mode = IN6_ADDR_GEN_MODE_EUI64, 241 .disable_policy = 0, 242 }; 243 244 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = { 245 .forwarding = 0, 246 .hop_limit = IPV6_DEFAULT_HOPLIMIT, 247 .mtu6 = IPV6_MIN_MTU, 248 .accept_ra = 1, 249 .accept_redirects = 1, 250 .autoconf = 1, 251 .force_mld_version = 0, 252 .mldv1_unsolicited_report_interval = 10 * HZ, 253 .mldv2_unsolicited_report_interval = HZ, 254 .dad_transmits = 1, 255 .rtr_solicits = MAX_RTR_SOLICITATIONS, 256 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL, 257 .rtr_solicit_max_interval = RTR_SOLICITATION_MAX_INTERVAL, 258 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY, 259 .use_tempaddr = 0, 260 .temp_valid_lft = TEMP_VALID_LIFETIME, 261 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME, 262 .regen_max_retry = REGEN_MAX_RETRY, 263 .max_desync_factor = MAX_DESYNC_FACTOR, 264 .max_addresses = IPV6_MAX_ADDRESSES, 265 .accept_ra_defrtr = 1, 266 .accept_ra_from_local = 0, 267 .accept_ra_min_hop_limit= 1, 268 .accept_ra_pinfo = 1, 269 #ifdef CONFIG_IPV6_ROUTER_PREF 270 .accept_ra_rtr_pref = 1, 271 .rtr_probe_interval = 60 * HZ, 272 #ifdef CONFIG_IPV6_ROUTE_INFO 273 .accept_ra_rt_info_min_plen = 0, 274 .accept_ra_rt_info_max_plen = 0, 275 #endif 276 #endif 277 .proxy_ndp = 0, 278 .accept_source_route = 0, /* we do not accept RH0 by default. */ 279 .disable_ipv6 = 0, 280 .accept_dad = 1, 281 .suppress_frag_ndisc = 1, 282 .accept_ra_mtu = 1, 283 .stable_secret = { 284 .initialized = false, 285 }, 286 .use_oif_addrs_only = 0, 287 .ignore_routes_with_linkdown = 0, 288 .keep_addr_on_down = 0, 289 .seg6_enabled = 0, 290 #ifdef CONFIG_IPV6_SEG6_HMAC 291 .seg6_require_hmac = 0, 292 #endif 293 .enhanced_dad = 1, 294 .addr_gen_mode = IN6_ADDR_GEN_MODE_EUI64, 295 .disable_policy = 0, 296 }; 297 298 /* Check if link is ready: is it up and is a valid qdisc available */ 299 static inline bool addrconf_link_ready(const struct net_device *dev) 300 { 301 return netif_oper_up(dev) && !qdisc_tx_is_noop(dev); 302 } 303 304 static void addrconf_del_rs_timer(struct inet6_dev *idev) 305 { 306 if (del_timer(&idev->rs_timer)) 307 __in6_dev_put(idev); 308 } 309 310 static void addrconf_del_dad_work(struct inet6_ifaddr *ifp) 311 { 312 if (cancel_delayed_work(&ifp->dad_work)) 313 __in6_ifa_put(ifp); 314 } 315 316 static void addrconf_mod_rs_timer(struct inet6_dev *idev, 317 unsigned long when) 318 { 319 if (!timer_pending(&idev->rs_timer)) 320 in6_dev_hold(idev); 321 mod_timer(&idev->rs_timer, jiffies + when); 322 } 323 324 static void addrconf_mod_dad_work(struct inet6_ifaddr *ifp, 325 unsigned long delay) 326 { 327 in6_ifa_hold(ifp); 328 if (mod_delayed_work(addrconf_wq, &ifp->dad_work, delay)) 329 in6_ifa_put(ifp); 330 } 331 332 static int snmp6_alloc_dev(struct inet6_dev *idev) 333 { 334 int i; 335 336 idev->stats.ipv6 = alloc_percpu(struct ipstats_mib); 337 if (!idev->stats.ipv6) 338 goto err_ip; 339 340 for_each_possible_cpu(i) { 341 struct ipstats_mib *addrconf_stats; 342 addrconf_stats = per_cpu_ptr(idev->stats.ipv6, i); 343 u64_stats_init(&addrconf_stats->syncp); 344 } 345 346 347 idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device), 348 GFP_KERNEL); 349 if (!idev->stats.icmpv6dev) 350 goto err_icmp; 351 idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device), 352 GFP_KERNEL); 353 if (!idev->stats.icmpv6msgdev) 354 goto err_icmpmsg; 355 356 return 0; 357 358 err_icmpmsg: 359 kfree(idev->stats.icmpv6dev); 360 err_icmp: 361 free_percpu(idev->stats.ipv6); 362 err_ip: 363 return -ENOMEM; 364 } 365 366 static struct inet6_dev *ipv6_add_dev(struct net_device *dev) 367 { 368 struct inet6_dev *ndev; 369 int err = -ENOMEM; 370 371 ASSERT_RTNL(); 372 373 if (dev->mtu < IPV6_MIN_MTU) 374 return ERR_PTR(-EINVAL); 375 376 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL); 377 if (!ndev) 378 return ERR_PTR(err); 379 380 rwlock_init(&ndev->lock); 381 ndev->dev = dev; 382 INIT_LIST_HEAD(&ndev->addr_list); 383 timer_setup(&ndev->rs_timer, addrconf_rs_timer, 0); 384 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf)); 385 386 if (ndev->cnf.stable_secret.initialized) 387 ndev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY; 388 389 ndev->cnf.mtu6 = dev->mtu; 390 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl); 391 if (!ndev->nd_parms) { 392 kfree(ndev); 393 return ERR_PTR(err); 394 } 395 if (ndev->cnf.forwarding) 396 dev_disable_lro(dev); 397 /* We refer to the device */ 398 dev_hold(dev); 399 400 if (snmp6_alloc_dev(ndev) < 0) { 401 netdev_dbg(dev, "%s: cannot allocate memory for statistics\n", 402 __func__); 403 neigh_parms_release(&nd_tbl, ndev->nd_parms); 404 dev_put(dev); 405 kfree(ndev); 406 return ERR_PTR(err); 407 } 408 409 if (snmp6_register_dev(ndev) < 0) { 410 netdev_dbg(dev, "%s: cannot create /proc/net/dev_snmp6/%s\n", 411 __func__, dev->name); 412 goto err_release; 413 } 414 415 /* One reference from device. */ 416 refcount_set(&ndev->refcnt, 1); 417 418 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK)) 419 ndev->cnf.accept_dad = -1; 420 421 #if IS_ENABLED(CONFIG_IPV6_SIT) 422 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) { 423 pr_info("%s: Disabled Multicast RS\n", dev->name); 424 ndev->cnf.rtr_solicits = 0; 425 } 426 #endif 427 428 INIT_LIST_HEAD(&ndev->tempaddr_list); 429 ndev->desync_factor = U32_MAX; 430 if ((dev->flags&IFF_LOOPBACK) || 431 dev->type == ARPHRD_TUNNEL || 432 dev->type == ARPHRD_TUNNEL6 || 433 dev->type == ARPHRD_SIT || 434 dev->type == ARPHRD_NONE) { 435 ndev->cnf.use_tempaddr = -1; 436 } else 437 ipv6_regen_rndid(ndev); 438 439 ndev->token = in6addr_any; 440 441 if (netif_running(dev) && addrconf_link_ready(dev)) 442 ndev->if_flags |= IF_READY; 443 444 ipv6_mc_init_dev(ndev); 445 ndev->tstamp = jiffies; 446 err = addrconf_sysctl_register(ndev); 447 if (err) { 448 ipv6_mc_destroy_dev(ndev); 449 snmp6_unregister_dev(ndev); 450 goto err_release; 451 } 452 /* protected by rtnl_lock */ 453 rcu_assign_pointer(dev->ip6_ptr, ndev); 454 455 /* Join interface-local all-node multicast group */ 456 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allnodes); 457 458 /* Join all-node multicast group */ 459 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes); 460 461 /* Join all-router multicast group if forwarding is set */ 462 if (ndev->cnf.forwarding && (dev->flags & IFF_MULTICAST)) 463 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters); 464 465 return ndev; 466 467 err_release: 468 neigh_parms_release(&nd_tbl, ndev->nd_parms); 469 ndev->dead = 1; 470 in6_dev_finish_destroy(ndev); 471 return ERR_PTR(err); 472 } 473 474 static struct inet6_dev *ipv6_find_idev(struct net_device *dev) 475 { 476 struct inet6_dev *idev; 477 478 ASSERT_RTNL(); 479 480 idev = __in6_dev_get(dev); 481 if (!idev) { 482 idev = ipv6_add_dev(dev); 483 if (IS_ERR(idev)) 484 return NULL; 485 } 486 487 if (dev->flags&IFF_UP) 488 ipv6_mc_up(idev); 489 return idev; 490 } 491 492 static int inet6_netconf_msgsize_devconf(int type) 493 { 494 int size = NLMSG_ALIGN(sizeof(struct netconfmsg)) 495 + nla_total_size(4); /* NETCONFA_IFINDEX */ 496 bool all = false; 497 498 if (type == NETCONFA_ALL) 499 all = true; 500 501 if (all || type == NETCONFA_FORWARDING) 502 size += nla_total_size(4); 503 #ifdef CONFIG_IPV6_MROUTE 504 if (all || type == NETCONFA_MC_FORWARDING) 505 size += nla_total_size(4); 506 #endif 507 if (all || type == NETCONFA_PROXY_NEIGH) 508 size += nla_total_size(4); 509 510 if (all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN) 511 size += nla_total_size(4); 512 513 return size; 514 } 515 516 static int inet6_netconf_fill_devconf(struct sk_buff *skb, int ifindex, 517 struct ipv6_devconf *devconf, u32 portid, 518 u32 seq, int event, unsigned int flags, 519 int type) 520 { 521 struct nlmsghdr *nlh; 522 struct netconfmsg *ncm; 523 bool all = false; 524 525 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg), 526 flags); 527 if (!nlh) 528 return -EMSGSIZE; 529 530 if (type == NETCONFA_ALL) 531 all = true; 532 533 ncm = nlmsg_data(nlh); 534 ncm->ncm_family = AF_INET6; 535 536 if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0) 537 goto nla_put_failure; 538 539 if (!devconf) 540 goto out; 541 542 if ((all || type == NETCONFA_FORWARDING) && 543 nla_put_s32(skb, NETCONFA_FORWARDING, devconf->forwarding) < 0) 544 goto nla_put_failure; 545 #ifdef CONFIG_IPV6_MROUTE 546 if ((all || type == NETCONFA_MC_FORWARDING) && 547 nla_put_s32(skb, NETCONFA_MC_FORWARDING, 548 devconf->mc_forwarding) < 0) 549 goto nla_put_failure; 550 #endif 551 if ((all || type == NETCONFA_PROXY_NEIGH) && 552 nla_put_s32(skb, NETCONFA_PROXY_NEIGH, devconf->proxy_ndp) < 0) 553 goto nla_put_failure; 554 555 if ((all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN) && 556 nla_put_s32(skb, NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN, 557 devconf->ignore_routes_with_linkdown) < 0) 558 goto nla_put_failure; 559 560 out: 561 nlmsg_end(skb, nlh); 562 return 0; 563 564 nla_put_failure: 565 nlmsg_cancel(skb, nlh); 566 return -EMSGSIZE; 567 } 568 569 void inet6_netconf_notify_devconf(struct net *net, int event, int type, 570 int ifindex, struct ipv6_devconf *devconf) 571 { 572 struct sk_buff *skb; 573 int err = -ENOBUFS; 574 575 skb = nlmsg_new(inet6_netconf_msgsize_devconf(type), GFP_KERNEL); 576 if (!skb) 577 goto errout; 578 579 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 0, 0, 580 event, 0, type); 581 if (err < 0) { 582 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */ 583 WARN_ON(err == -EMSGSIZE); 584 kfree_skb(skb); 585 goto errout; 586 } 587 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_NETCONF, NULL, GFP_KERNEL); 588 return; 589 errout: 590 rtnl_set_sk_err(net, RTNLGRP_IPV6_NETCONF, err); 591 } 592 593 static const struct nla_policy devconf_ipv6_policy[NETCONFA_MAX+1] = { 594 [NETCONFA_IFINDEX] = { .len = sizeof(int) }, 595 [NETCONFA_FORWARDING] = { .len = sizeof(int) }, 596 [NETCONFA_PROXY_NEIGH] = { .len = sizeof(int) }, 597 [NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN] = { .len = sizeof(int) }, 598 }; 599 600 static int inet6_netconf_get_devconf(struct sk_buff *in_skb, 601 struct nlmsghdr *nlh, 602 struct netlink_ext_ack *extack) 603 { 604 struct net *net = sock_net(in_skb->sk); 605 struct nlattr *tb[NETCONFA_MAX+1]; 606 struct inet6_dev *in6_dev = NULL; 607 struct net_device *dev = NULL; 608 struct netconfmsg *ncm; 609 struct sk_buff *skb; 610 struct ipv6_devconf *devconf; 611 int ifindex; 612 int err; 613 614 err = nlmsg_parse(nlh, sizeof(*ncm), tb, NETCONFA_MAX, 615 devconf_ipv6_policy, extack); 616 if (err < 0) 617 return err; 618 619 if (!tb[NETCONFA_IFINDEX]) 620 return -EINVAL; 621 622 err = -EINVAL; 623 ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]); 624 switch (ifindex) { 625 case NETCONFA_IFINDEX_ALL: 626 devconf = net->ipv6.devconf_all; 627 break; 628 case NETCONFA_IFINDEX_DEFAULT: 629 devconf = net->ipv6.devconf_dflt; 630 break; 631 default: 632 dev = dev_get_by_index(net, ifindex); 633 if (!dev) 634 return -EINVAL; 635 in6_dev = in6_dev_get(dev); 636 if (!in6_dev) 637 goto errout; 638 devconf = &in6_dev->cnf; 639 break; 640 } 641 642 err = -ENOBUFS; 643 skb = nlmsg_new(inet6_netconf_msgsize_devconf(NETCONFA_ALL), GFP_KERNEL); 644 if (!skb) 645 goto errout; 646 647 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 648 NETLINK_CB(in_skb).portid, 649 nlh->nlmsg_seq, RTM_NEWNETCONF, 0, 650 NETCONFA_ALL); 651 if (err < 0) { 652 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */ 653 WARN_ON(err == -EMSGSIZE); 654 kfree_skb(skb); 655 goto errout; 656 } 657 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid); 658 errout: 659 if (in6_dev) 660 in6_dev_put(in6_dev); 661 if (dev) 662 dev_put(dev); 663 return err; 664 } 665 666 static int inet6_netconf_dump_devconf(struct sk_buff *skb, 667 struct netlink_callback *cb) 668 { 669 const struct nlmsghdr *nlh = cb->nlh; 670 struct net *net = sock_net(skb->sk); 671 int h, s_h; 672 int idx, s_idx; 673 struct net_device *dev; 674 struct inet6_dev *idev; 675 struct hlist_head *head; 676 677 if (cb->strict_check) { 678 struct netlink_ext_ack *extack = cb->extack; 679 struct netconfmsg *ncm; 680 681 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ncm))) { 682 NL_SET_ERR_MSG_MOD(extack, "Invalid header for netconf dump request"); 683 return -EINVAL; 684 } 685 686 if (nlmsg_attrlen(nlh, sizeof(*ncm))) { 687 NL_SET_ERR_MSG_MOD(extack, "Invalid data after header in netconf dump request"); 688 return -EINVAL; 689 } 690 } 691 692 s_h = cb->args[0]; 693 s_idx = idx = cb->args[1]; 694 695 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 696 idx = 0; 697 head = &net->dev_index_head[h]; 698 rcu_read_lock(); 699 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ 700 net->dev_base_seq; 701 hlist_for_each_entry_rcu(dev, head, index_hlist) { 702 if (idx < s_idx) 703 goto cont; 704 idev = __in6_dev_get(dev); 705 if (!idev) 706 goto cont; 707 708 if (inet6_netconf_fill_devconf(skb, dev->ifindex, 709 &idev->cnf, 710 NETLINK_CB(cb->skb).portid, 711 nlh->nlmsg_seq, 712 RTM_NEWNETCONF, 713 NLM_F_MULTI, 714 NETCONFA_ALL) < 0) { 715 rcu_read_unlock(); 716 goto done; 717 } 718 nl_dump_check_consistent(cb, nlmsg_hdr(skb)); 719 cont: 720 idx++; 721 } 722 rcu_read_unlock(); 723 } 724 if (h == NETDEV_HASHENTRIES) { 725 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL, 726 net->ipv6.devconf_all, 727 NETLINK_CB(cb->skb).portid, 728 nlh->nlmsg_seq, 729 RTM_NEWNETCONF, NLM_F_MULTI, 730 NETCONFA_ALL) < 0) 731 goto done; 732 else 733 h++; 734 } 735 if (h == NETDEV_HASHENTRIES + 1) { 736 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT, 737 net->ipv6.devconf_dflt, 738 NETLINK_CB(cb->skb).portid, 739 nlh->nlmsg_seq, 740 RTM_NEWNETCONF, NLM_F_MULTI, 741 NETCONFA_ALL) < 0) 742 goto done; 743 else 744 h++; 745 } 746 done: 747 cb->args[0] = h; 748 cb->args[1] = idx; 749 750 return skb->len; 751 } 752 753 #ifdef CONFIG_SYSCTL 754 static void dev_forward_change(struct inet6_dev *idev) 755 { 756 struct net_device *dev; 757 struct inet6_ifaddr *ifa; 758 759 if (!idev) 760 return; 761 dev = idev->dev; 762 if (idev->cnf.forwarding) 763 dev_disable_lro(dev); 764 if (dev->flags & IFF_MULTICAST) { 765 if (idev->cnf.forwarding) { 766 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters); 767 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allrouters); 768 ipv6_dev_mc_inc(dev, &in6addr_sitelocal_allrouters); 769 } else { 770 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters); 771 ipv6_dev_mc_dec(dev, &in6addr_interfacelocal_allrouters); 772 ipv6_dev_mc_dec(dev, &in6addr_sitelocal_allrouters); 773 } 774 } 775 776 list_for_each_entry(ifa, &idev->addr_list, if_list) { 777 if (ifa->flags&IFA_F_TENTATIVE) 778 continue; 779 if (idev->cnf.forwarding) 780 addrconf_join_anycast(ifa); 781 else 782 addrconf_leave_anycast(ifa); 783 } 784 inet6_netconf_notify_devconf(dev_net(dev), RTM_NEWNETCONF, 785 NETCONFA_FORWARDING, 786 dev->ifindex, &idev->cnf); 787 } 788 789 790 static void addrconf_forward_change(struct net *net, __s32 newf) 791 { 792 struct net_device *dev; 793 struct inet6_dev *idev; 794 795 for_each_netdev(net, dev) { 796 idev = __in6_dev_get(dev); 797 if (idev) { 798 int changed = (!idev->cnf.forwarding) ^ (!newf); 799 idev->cnf.forwarding = newf; 800 if (changed) 801 dev_forward_change(idev); 802 } 803 } 804 } 805 806 static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf) 807 { 808 struct net *net; 809 int old; 810 811 if (!rtnl_trylock()) 812 return restart_syscall(); 813 814 net = (struct net *)table->extra2; 815 old = *p; 816 *p = newf; 817 818 if (p == &net->ipv6.devconf_dflt->forwarding) { 819 if ((!newf) ^ (!old)) 820 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 821 NETCONFA_FORWARDING, 822 NETCONFA_IFINDEX_DEFAULT, 823 net->ipv6.devconf_dflt); 824 rtnl_unlock(); 825 return 0; 826 } 827 828 if (p == &net->ipv6.devconf_all->forwarding) { 829 int old_dflt = net->ipv6.devconf_dflt->forwarding; 830 831 net->ipv6.devconf_dflt->forwarding = newf; 832 if ((!newf) ^ (!old_dflt)) 833 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 834 NETCONFA_FORWARDING, 835 NETCONFA_IFINDEX_DEFAULT, 836 net->ipv6.devconf_dflt); 837 838 addrconf_forward_change(net, newf); 839 if ((!newf) ^ (!old)) 840 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 841 NETCONFA_FORWARDING, 842 NETCONFA_IFINDEX_ALL, 843 net->ipv6.devconf_all); 844 } else if ((!newf) ^ (!old)) 845 dev_forward_change((struct inet6_dev *)table->extra1); 846 rtnl_unlock(); 847 848 if (newf) 849 rt6_purge_dflt_routers(net); 850 return 1; 851 } 852 853 static void addrconf_linkdown_change(struct net *net, __s32 newf) 854 { 855 struct net_device *dev; 856 struct inet6_dev *idev; 857 858 for_each_netdev(net, dev) { 859 idev = __in6_dev_get(dev); 860 if (idev) { 861 int changed = (!idev->cnf.ignore_routes_with_linkdown) ^ (!newf); 862 863 idev->cnf.ignore_routes_with_linkdown = newf; 864 if (changed) 865 inet6_netconf_notify_devconf(dev_net(dev), 866 RTM_NEWNETCONF, 867 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN, 868 dev->ifindex, 869 &idev->cnf); 870 } 871 } 872 } 873 874 static int addrconf_fixup_linkdown(struct ctl_table *table, int *p, int newf) 875 { 876 struct net *net; 877 int old; 878 879 if (!rtnl_trylock()) 880 return restart_syscall(); 881 882 net = (struct net *)table->extra2; 883 old = *p; 884 *p = newf; 885 886 if (p == &net->ipv6.devconf_dflt->ignore_routes_with_linkdown) { 887 if ((!newf) ^ (!old)) 888 inet6_netconf_notify_devconf(net, 889 RTM_NEWNETCONF, 890 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN, 891 NETCONFA_IFINDEX_DEFAULT, 892 net->ipv6.devconf_dflt); 893 rtnl_unlock(); 894 return 0; 895 } 896 897 if (p == &net->ipv6.devconf_all->ignore_routes_with_linkdown) { 898 net->ipv6.devconf_dflt->ignore_routes_with_linkdown = newf; 899 addrconf_linkdown_change(net, newf); 900 if ((!newf) ^ (!old)) 901 inet6_netconf_notify_devconf(net, 902 RTM_NEWNETCONF, 903 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN, 904 NETCONFA_IFINDEX_ALL, 905 net->ipv6.devconf_all); 906 } 907 rtnl_unlock(); 908 909 return 1; 910 } 911 912 #endif 913 914 /* Nobody refers to this ifaddr, destroy it */ 915 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp) 916 { 917 WARN_ON(!hlist_unhashed(&ifp->addr_lst)); 918 919 #ifdef NET_REFCNT_DEBUG 920 pr_debug("%s\n", __func__); 921 #endif 922 923 in6_dev_put(ifp->idev); 924 925 if (cancel_delayed_work(&ifp->dad_work)) 926 pr_notice("delayed DAD work was pending while freeing ifa=%p\n", 927 ifp); 928 929 if (ifp->state != INET6_IFADDR_STATE_DEAD) { 930 pr_warn("Freeing alive inet6 address %p\n", ifp); 931 return; 932 } 933 934 kfree_rcu(ifp, rcu); 935 } 936 937 static void 938 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp) 939 { 940 struct list_head *p; 941 int ifp_scope = ipv6_addr_src_scope(&ifp->addr); 942 943 /* 944 * Each device address list is sorted in order of scope - 945 * global before linklocal. 946 */ 947 list_for_each(p, &idev->addr_list) { 948 struct inet6_ifaddr *ifa 949 = list_entry(p, struct inet6_ifaddr, if_list); 950 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr)) 951 break; 952 } 953 954 list_add_tail_rcu(&ifp->if_list, p); 955 } 956 957 static u32 inet6_addr_hash(const struct net *net, const struct in6_addr *addr) 958 { 959 u32 val = ipv6_addr_hash(addr) ^ net_hash_mix(net); 960 961 return hash_32(val, IN6_ADDR_HSIZE_SHIFT); 962 } 963 964 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr, 965 struct net_device *dev, unsigned int hash) 966 { 967 struct inet6_ifaddr *ifp; 968 969 hlist_for_each_entry(ifp, &inet6_addr_lst[hash], addr_lst) { 970 if (!net_eq(dev_net(ifp->idev->dev), net)) 971 continue; 972 if (ipv6_addr_equal(&ifp->addr, addr)) { 973 if (!dev || ifp->idev->dev == dev) 974 return true; 975 } 976 } 977 return false; 978 } 979 980 static int ipv6_add_addr_hash(struct net_device *dev, struct inet6_ifaddr *ifa) 981 { 982 unsigned int hash = inet6_addr_hash(dev_net(dev), &ifa->addr); 983 int err = 0; 984 985 spin_lock(&addrconf_hash_lock); 986 987 /* Ignore adding duplicate addresses on an interface */ 988 if (ipv6_chk_same_addr(dev_net(dev), &ifa->addr, dev, hash)) { 989 netdev_dbg(dev, "ipv6_add_addr: already assigned\n"); 990 err = -EEXIST; 991 } else { 992 hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]); 993 } 994 995 spin_unlock(&addrconf_hash_lock); 996 997 return err; 998 } 999 1000 /* On success it returns ifp with increased reference count */ 1001 1002 static struct inet6_ifaddr * 1003 ipv6_add_addr(struct inet6_dev *idev, struct ifa6_config *cfg, 1004 bool can_block, struct netlink_ext_ack *extack) 1005 { 1006 gfp_t gfp_flags = can_block ? GFP_KERNEL : GFP_ATOMIC; 1007 int addr_type = ipv6_addr_type(cfg->pfx); 1008 struct net *net = dev_net(idev->dev); 1009 struct inet6_ifaddr *ifa = NULL; 1010 struct fib6_info *f6i = NULL; 1011 int err = 0; 1012 1013 if (addr_type == IPV6_ADDR_ANY || 1014 addr_type & IPV6_ADDR_MULTICAST || 1015 (!(idev->dev->flags & IFF_LOOPBACK) && 1016 !netif_is_l3_master(idev->dev) && 1017 addr_type & IPV6_ADDR_LOOPBACK)) 1018 return ERR_PTR(-EADDRNOTAVAIL); 1019 1020 if (idev->dead) { 1021 err = -ENODEV; /*XXX*/ 1022 goto out; 1023 } 1024 1025 if (idev->cnf.disable_ipv6) { 1026 err = -EACCES; 1027 goto out; 1028 } 1029 1030 /* validator notifier needs to be blocking; 1031 * do not call in atomic context 1032 */ 1033 if (can_block) { 1034 struct in6_validator_info i6vi = { 1035 .i6vi_addr = *cfg->pfx, 1036 .i6vi_dev = idev, 1037 .extack = extack, 1038 }; 1039 1040 err = inet6addr_validator_notifier_call_chain(NETDEV_UP, &i6vi); 1041 err = notifier_to_errno(err); 1042 if (err < 0) 1043 goto out; 1044 } 1045 1046 ifa = kzalloc(sizeof(*ifa), gfp_flags); 1047 if (!ifa) { 1048 err = -ENOBUFS; 1049 goto out; 1050 } 1051 1052 f6i = addrconf_f6i_alloc(net, idev, cfg->pfx, false, gfp_flags); 1053 if (IS_ERR(f6i)) { 1054 err = PTR_ERR(f6i); 1055 f6i = NULL; 1056 goto out; 1057 } 1058 1059 if (net->ipv6.devconf_all->disable_policy || 1060 idev->cnf.disable_policy) 1061 f6i->dst_nopolicy = true; 1062 1063 neigh_parms_data_state_setall(idev->nd_parms); 1064 1065 ifa->addr = *cfg->pfx; 1066 if (cfg->peer_pfx) 1067 ifa->peer_addr = *cfg->peer_pfx; 1068 1069 spin_lock_init(&ifa->lock); 1070 INIT_DELAYED_WORK(&ifa->dad_work, addrconf_dad_work); 1071 INIT_HLIST_NODE(&ifa->addr_lst); 1072 ifa->scope = cfg->scope; 1073 ifa->prefix_len = cfg->plen; 1074 ifa->rt_priority = cfg->rt_priority; 1075 ifa->flags = cfg->ifa_flags; 1076 /* No need to add the TENTATIVE flag for addresses with NODAD */ 1077 if (!(cfg->ifa_flags & IFA_F_NODAD)) 1078 ifa->flags |= IFA_F_TENTATIVE; 1079 ifa->valid_lft = cfg->valid_lft; 1080 ifa->prefered_lft = cfg->preferred_lft; 1081 ifa->cstamp = ifa->tstamp = jiffies; 1082 ifa->tokenized = false; 1083 1084 ifa->rt = f6i; 1085 1086 ifa->idev = idev; 1087 in6_dev_hold(idev); 1088 1089 /* For caller */ 1090 refcount_set(&ifa->refcnt, 1); 1091 1092 rcu_read_lock_bh(); 1093 1094 err = ipv6_add_addr_hash(idev->dev, ifa); 1095 if (err < 0) { 1096 rcu_read_unlock_bh(); 1097 goto out; 1098 } 1099 1100 write_lock(&idev->lock); 1101 1102 /* Add to inet6_dev unicast addr list. */ 1103 ipv6_link_dev_addr(idev, ifa); 1104 1105 if (ifa->flags&IFA_F_TEMPORARY) { 1106 list_add(&ifa->tmp_list, &idev->tempaddr_list); 1107 in6_ifa_hold(ifa); 1108 } 1109 1110 in6_ifa_hold(ifa); 1111 write_unlock(&idev->lock); 1112 1113 rcu_read_unlock_bh(); 1114 1115 inet6addr_notifier_call_chain(NETDEV_UP, ifa); 1116 out: 1117 if (unlikely(err < 0)) { 1118 fib6_info_release(f6i); 1119 1120 if (ifa) { 1121 if (ifa->idev) 1122 in6_dev_put(ifa->idev); 1123 kfree(ifa); 1124 } 1125 ifa = ERR_PTR(err); 1126 } 1127 1128 return ifa; 1129 } 1130 1131 enum cleanup_prefix_rt_t { 1132 CLEANUP_PREFIX_RT_NOP, /* no cleanup action for prefix route */ 1133 CLEANUP_PREFIX_RT_DEL, /* delete the prefix route */ 1134 CLEANUP_PREFIX_RT_EXPIRE, /* update the lifetime of the prefix route */ 1135 }; 1136 1137 /* 1138 * Check, whether the prefix for ifp would still need a prefix route 1139 * after deleting ifp. The function returns one of the CLEANUP_PREFIX_RT_* 1140 * constants. 1141 * 1142 * 1) we don't purge prefix if address was not permanent. 1143 * prefix is managed by its own lifetime. 1144 * 2) we also don't purge, if the address was IFA_F_NOPREFIXROUTE. 1145 * 3) if there are no addresses, delete prefix. 1146 * 4) if there are still other permanent address(es), 1147 * corresponding prefix is still permanent. 1148 * 5) if there are still other addresses with IFA_F_NOPREFIXROUTE, 1149 * don't purge the prefix, assume user space is managing it. 1150 * 6) otherwise, update prefix lifetime to the 1151 * longest valid lifetime among the corresponding 1152 * addresses on the device. 1153 * Note: subsequent RA will update lifetime. 1154 **/ 1155 static enum cleanup_prefix_rt_t 1156 check_cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long *expires) 1157 { 1158 struct inet6_ifaddr *ifa; 1159 struct inet6_dev *idev = ifp->idev; 1160 unsigned long lifetime; 1161 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_DEL; 1162 1163 *expires = jiffies; 1164 1165 list_for_each_entry(ifa, &idev->addr_list, if_list) { 1166 if (ifa == ifp) 1167 continue; 1168 if (!ipv6_prefix_equal(&ifa->addr, &ifp->addr, 1169 ifp->prefix_len)) 1170 continue; 1171 if (ifa->flags & (IFA_F_PERMANENT | IFA_F_NOPREFIXROUTE)) 1172 return CLEANUP_PREFIX_RT_NOP; 1173 1174 action = CLEANUP_PREFIX_RT_EXPIRE; 1175 1176 spin_lock(&ifa->lock); 1177 1178 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ); 1179 /* 1180 * Note: Because this address is 1181 * not permanent, lifetime < 1182 * LONG_MAX / HZ here. 1183 */ 1184 if (time_before(*expires, ifa->tstamp + lifetime * HZ)) 1185 *expires = ifa->tstamp + lifetime * HZ; 1186 spin_unlock(&ifa->lock); 1187 } 1188 1189 return action; 1190 } 1191 1192 static void 1193 cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long expires, bool del_rt) 1194 { 1195 struct fib6_info *f6i; 1196 1197 f6i = addrconf_get_prefix_route(&ifp->addr, 1198 ifp->prefix_len, 1199 ifp->idev->dev, 1200 0, RTF_GATEWAY | RTF_DEFAULT); 1201 if (f6i) { 1202 if (del_rt) 1203 ip6_del_rt(dev_net(ifp->idev->dev), f6i); 1204 else { 1205 if (!(f6i->fib6_flags & RTF_EXPIRES)) 1206 fib6_set_expires(f6i, expires); 1207 fib6_info_release(f6i); 1208 } 1209 } 1210 } 1211 1212 1213 /* This function wants to get referenced ifp and releases it before return */ 1214 1215 static void ipv6_del_addr(struct inet6_ifaddr *ifp) 1216 { 1217 int state; 1218 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_NOP; 1219 unsigned long expires; 1220 1221 ASSERT_RTNL(); 1222 1223 spin_lock_bh(&ifp->lock); 1224 state = ifp->state; 1225 ifp->state = INET6_IFADDR_STATE_DEAD; 1226 spin_unlock_bh(&ifp->lock); 1227 1228 if (state == INET6_IFADDR_STATE_DEAD) 1229 goto out; 1230 1231 spin_lock_bh(&addrconf_hash_lock); 1232 hlist_del_init_rcu(&ifp->addr_lst); 1233 spin_unlock_bh(&addrconf_hash_lock); 1234 1235 write_lock_bh(&ifp->idev->lock); 1236 1237 if (ifp->flags&IFA_F_TEMPORARY) { 1238 list_del(&ifp->tmp_list); 1239 if (ifp->ifpub) { 1240 in6_ifa_put(ifp->ifpub); 1241 ifp->ifpub = NULL; 1242 } 1243 __in6_ifa_put(ifp); 1244 } 1245 1246 if (ifp->flags & IFA_F_PERMANENT && !(ifp->flags & IFA_F_NOPREFIXROUTE)) 1247 action = check_cleanup_prefix_route(ifp, &expires); 1248 1249 list_del_rcu(&ifp->if_list); 1250 __in6_ifa_put(ifp); 1251 1252 write_unlock_bh(&ifp->idev->lock); 1253 1254 addrconf_del_dad_work(ifp); 1255 1256 ipv6_ifa_notify(RTM_DELADDR, ifp); 1257 1258 inet6addr_notifier_call_chain(NETDEV_DOWN, ifp); 1259 1260 if (action != CLEANUP_PREFIX_RT_NOP) { 1261 cleanup_prefix_route(ifp, expires, 1262 action == CLEANUP_PREFIX_RT_DEL); 1263 } 1264 1265 /* clean up prefsrc entries */ 1266 rt6_remove_prefsrc(ifp); 1267 out: 1268 in6_ifa_put(ifp); 1269 } 1270 1271 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, 1272 struct inet6_ifaddr *ift, 1273 bool block) 1274 { 1275 struct inet6_dev *idev = ifp->idev; 1276 struct in6_addr addr, *tmpaddr; 1277 unsigned long tmp_tstamp, age; 1278 unsigned long regen_advance; 1279 struct ifa6_config cfg; 1280 int ret = 0; 1281 unsigned long now = jiffies; 1282 long max_desync_factor; 1283 s32 cnf_temp_preferred_lft; 1284 1285 write_lock_bh(&idev->lock); 1286 if (ift) { 1287 spin_lock_bh(&ift->lock); 1288 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8); 1289 spin_unlock_bh(&ift->lock); 1290 tmpaddr = &addr; 1291 } else { 1292 tmpaddr = NULL; 1293 } 1294 retry: 1295 in6_dev_hold(idev); 1296 if (idev->cnf.use_tempaddr <= 0) { 1297 write_unlock_bh(&idev->lock); 1298 pr_info("%s: use_tempaddr is disabled\n", __func__); 1299 in6_dev_put(idev); 1300 ret = -1; 1301 goto out; 1302 } 1303 spin_lock_bh(&ifp->lock); 1304 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) { 1305 idev->cnf.use_tempaddr = -1; /*XXX*/ 1306 spin_unlock_bh(&ifp->lock); 1307 write_unlock_bh(&idev->lock); 1308 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n", 1309 __func__); 1310 in6_dev_put(idev); 1311 ret = -1; 1312 goto out; 1313 } 1314 in6_ifa_hold(ifp); 1315 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8); 1316 ipv6_try_regen_rndid(idev, tmpaddr); 1317 memcpy(&addr.s6_addr[8], idev->rndid, 8); 1318 age = (now - ifp->tstamp) / HZ; 1319 1320 regen_advance = idev->cnf.regen_max_retry * 1321 idev->cnf.dad_transmits * 1322 NEIGH_VAR(idev->nd_parms, RETRANS_TIME) / HZ; 1323 1324 /* recalculate max_desync_factor each time and update 1325 * idev->desync_factor if it's larger 1326 */ 1327 cnf_temp_preferred_lft = READ_ONCE(idev->cnf.temp_prefered_lft); 1328 max_desync_factor = min_t(__u32, 1329 idev->cnf.max_desync_factor, 1330 cnf_temp_preferred_lft - regen_advance); 1331 1332 if (unlikely(idev->desync_factor > max_desync_factor)) { 1333 if (max_desync_factor > 0) { 1334 get_random_bytes(&idev->desync_factor, 1335 sizeof(idev->desync_factor)); 1336 idev->desync_factor %= max_desync_factor; 1337 } else { 1338 idev->desync_factor = 0; 1339 } 1340 } 1341 1342 memset(&cfg, 0, sizeof(cfg)); 1343 cfg.valid_lft = min_t(__u32, ifp->valid_lft, 1344 idev->cnf.temp_valid_lft + age); 1345 cfg.preferred_lft = cnf_temp_preferred_lft + age - idev->desync_factor; 1346 cfg.preferred_lft = min_t(__u32, ifp->prefered_lft, cfg.preferred_lft); 1347 1348 cfg.plen = ifp->prefix_len; 1349 tmp_tstamp = ifp->tstamp; 1350 spin_unlock_bh(&ifp->lock); 1351 1352 write_unlock_bh(&idev->lock); 1353 1354 /* A temporary address is created only if this calculated Preferred 1355 * Lifetime is greater than REGEN_ADVANCE time units. In particular, 1356 * an implementation must not create a temporary address with a zero 1357 * Preferred Lifetime. 1358 * Use age calculation as in addrconf_verify to avoid unnecessary 1359 * temporary addresses being generated. 1360 */ 1361 age = (now - tmp_tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ; 1362 if (cfg.preferred_lft <= regen_advance + age) { 1363 in6_ifa_put(ifp); 1364 in6_dev_put(idev); 1365 ret = -1; 1366 goto out; 1367 } 1368 1369 cfg.ifa_flags = IFA_F_TEMPORARY; 1370 /* set in addrconf_prefix_rcv() */ 1371 if (ifp->flags & IFA_F_OPTIMISTIC) 1372 cfg.ifa_flags |= IFA_F_OPTIMISTIC; 1373 1374 cfg.pfx = &addr; 1375 cfg.scope = ipv6_addr_scope(cfg.pfx); 1376 1377 ift = ipv6_add_addr(idev, &cfg, block, NULL); 1378 if (IS_ERR(ift)) { 1379 in6_ifa_put(ifp); 1380 in6_dev_put(idev); 1381 pr_info("%s: retry temporary address regeneration\n", __func__); 1382 tmpaddr = &addr; 1383 write_lock_bh(&idev->lock); 1384 goto retry; 1385 } 1386 1387 spin_lock_bh(&ift->lock); 1388 ift->ifpub = ifp; 1389 ift->cstamp = now; 1390 ift->tstamp = tmp_tstamp; 1391 spin_unlock_bh(&ift->lock); 1392 1393 addrconf_dad_start(ift); 1394 in6_ifa_put(ift); 1395 in6_dev_put(idev); 1396 out: 1397 return ret; 1398 } 1399 1400 /* 1401 * Choose an appropriate source address (RFC3484) 1402 */ 1403 enum { 1404 IPV6_SADDR_RULE_INIT = 0, 1405 IPV6_SADDR_RULE_LOCAL, 1406 IPV6_SADDR_RULE_SCOPE, 1407 IPV6_SADDR_RULE_PREFERRED, 1408 #ifdef CONFIG_IPV6_MIP6 1409 IPV6_SADDR_RULE_HOA, 1410 #endif 1411 IPV6_SADDR_RULE_OIF, 1412 IPV6_SADDR_RULE_LABEL, 1413 IPV6_SADDR_RULE_PRIVACY, 1414 IPV6_SADDR_RULE_ORCHID, 1415 IPV6_SADDR_RULE_PREFIX, 1416 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1417 IPV6_SADDR_RULE_NOT_OPTIMISTIC, 1418 #endif 1419 IPV6_SADDR_RULE_MAX 1420 }; 1421 1422 struct ipv6_saddr_score { 1423 int rule; 1424 int addr_type; 1425 struct inet6_ifaddr *ifa; 1426 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX); 1427 int scopedist; 1428 int matchlen; 1429 }; 1430 1431 struct ipv6_saddr_dst { 1432 const struct in6_addr *addr; 1433 int ifindex; 1434 int scope; 1435 int label; 1436 unsigned int prefs; 1437 }; 1438 1439 static inline int ipv6_saddr_preferred(int type) 1440 { 1441 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK)) 1442 return 1; 1443 return 0; 1444 } 1445 1446 static bool ipv6_use_optimistic_addr(struct net *net, 1447 struct inet6_dev *idev) 1448 { 1449 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1450 if (!idev) 1451 return false; 1452 if (!net->ipv6.devconf_all->optimistic_dad && !idev->cnf.optimistic_dad) 1453 return false; 1454 if (!net->ipv6.devconf_all->use_optimistic && !idev->cnf.use_optimistic) 1455 return false; 1456 1457 return true; 1458 #else 1459 return false; 1460 #endif 1461 } 1462 1463 static bool ipv6_allow_optimistic_dad(struct net *net, 1464 struct inet6_dev *idev) 1465 { 1466 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1467 if (!idev) 1468 return false; 1469 if (!net->ipv6.devconf_all->optimistic_dad && !idev->cnf.optimistic_dad) 1470 return false; 1471 1472 return true; 1473 #else 1474 return false; 1475 #endif 1476 } 1477 1478 static int ipv6_get_saddr_eval(struct net *net, 1479 struct ipv6_saddr_score *score, 1480 struct ipv6_saddr_dst *dst, 1481 int i) 1482 { 1483 int ret; 1484 1485 if (i <= score->rule) { 1486 switch (i) { 1487 case IPV6_SADDR_RULE_SCOPE: 1488 ret = score->scopedist; 1489 break; 1490 case IPV6_SADDR_RULE_PREFIX: 1491 ret = score->matchlen; 1492 break; 1493 default: 1494 ret = !!test_bit(i, score->scorebits); 1495 } 1496 goto out; 1497 } 1498 1499 switch (i) { 1500 case IPV6_SADDR_RULE_INIT: 1501 /* Rule 0: remember if hiscore is not ready yet */ 1502 ret = !!score->ifa; 1503 break; 1504 case IPV6_SADDR_RULE_LOCAL: 1505 /* Rule 1: Prefer same address */ 1506 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr); 1507 break; 1508 case IPV6_SADDR_RULE_SCOPE: 1509 /* Rule 2: Prefer appropriate scope 1510 * 1511 * ret 1512 * ^ 1513 * -1 | d 15 1514 * ---+--+-+---> scope 1515 * | 1516 * | d is scope of the destination. 1517 * B-d | \ 1518 * | \ <- smaller scope is better if 1519 * B-15 | \ if scope is enough for destination. 1520 * | ret = B - scope (-1 <= scope >= d <= 15). 1521 * d-C-1 | / 1522 * |/ <- greater is better 1523 * -C / if scope is not enough for destination. 1524 * /| ret = scope - C (-1 <= d < scope <= 15). 1525 * 1526 * d - C - 1 < B -15 (for all -1 <= d <= 15). 1527 * C > d + 14 - B >= 15 + 14 - B = 29 - B. 1528 * Assume B = 0 and we get C > 29. 1529 */ 1530 ret = __ipv6_addr_src_scope(score->addr_type); 1531 if (ret >= dst->scope) 1532 ret = -ret; 1533 else 1534 ret -= 128; /* 30 is enough */ 1535 score->scopedist = ret; 1536 break; 1537 case IPV6_SADDR_RULE_PREFERRED: 1538 { 1539 /* Rule 3: Avoid deprecated and optimistic addresses */ 1540 u8 avoid = IFA_F_DEPRECATED; 1541 1542 if (!ipv6_use_optimistic_addr(net, score->ifa->idev)) 1543 avoid |= IFA_F_OPTIMISTIC; 1544 ret = ipv6_saddr_preferred(score->addr_type) || 1545 !(score->ifa->flags & avoid); 1546 break; 1547 } 1548 #ifdef CONFIG_IPV6_MIP6 1549 case IPV6_SADDR_RULE_HOA: 1550 { 1551 /* Rule 4: Prefer home address */ 1552 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA); 1553 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome; 1554 break; 1555 } 1556 #endif 1557 case IPV6_SADDR_RULE_OIF: 1558 /* Rule 5: Prefer outgoing interface */ 1559 ret = (!dst->ifindex || 1560 dst->ifindex == score->ifa->idev->dev->ifindex); 1561 break; 1562 case IPV6_SADDR_RULE_LABEL: 1563 /* Rule 6: Prefer matching label */ 1564 ret = ipv6_addr_label(net, 1565 &score->ifa->addr, score->addr_type, 1566 score->ifa->idev->dev->ifindex) == dst->label; 1567 break; 1568 case IPV6_SADDR_RULE_PRIVACY: 1569 { 1570 /* Rule 7: Prefer public address 1571 * Note: prefer temporary address if use_tempaddr >= 2 1572 */ 1573 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ? 1574 !!(dst->prefs & IPV6_PREFER_SRC_TMP) : 1575 score->ifa->idev->cnf.use_tempaddr >= 2; 1576 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp; 1577 break; 1578 } 1579 case IPV6_SADDR_RULE_ORCHID: 1580 /* Rule 8-: Prefer ORCHID vs ORCHID or 1581 * non-ORCHID vs non-ORCHID 1582 */ 1583 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^ 1584 ipv6_addr_orchid(dst->addr)); 1585 break; 1586 case IPV6_SADDR_RULE_PREFIX: 1587 /* Rule 8: Use longest matching prefix */ 1588 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr); 1589 if (ret > score->ifa->prefix_len) 1590 ret = score->ifa->prefix_len; 1591 score->matchlen = ret; 1592 break; 1593 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1594 case IPV6_SADDR_RULE_NOT_OPTIMISTIC: 1595 /* Optimistic addresses still have lower precedence than other 1596 * preferred addresses. 1597 */ 1598 ret = !(score->ifa->flags & IFA_F_OPTIMISTIC); 1599 break; 1600 #endif 1601 default: 1602 ret = 0; 1603 } 1604 1605 if (ret) 1606 __set_bit(i, score->scorebits); 1607 score->rule = i; 1608 out: 1609 return ret; 1610 } 1611 1612 static int __ipv6_dev_get_saddr(struct net *net, 1613 struct ipv6_saddr_dst *dst, 1614 struct inet6_dev *idev, 1615 struct ipv6_saddr_score *scores, 1616 int hiscore_idx) 1617 { 1618 struct ipv6_saddr_score *score = &scores[1 - hiscore_idx], *hiscore = &scores[hiscore_idx]; 1619 1620 list_for_each_entry_rcu(score->ifa, &idev->addr_list, if_list) { 1621 int i; 1622 1623 /* 1624 * - Tentative Address (RFC2462 section 5.4) 1625 * - A tentative address is not considered 1626 * "assigned to an interface" in the traditional 1627 * sense, unless it is also flagged as optimistic. 1628 * - Candidate Source Address (section 4) 1629 * - In any case, anycast addresses, multicast 1630 * addresses, and the unspecified address MUST 1631 * NOT be included in a candidate set. 1632 */ 1633 if ((score->ifa->flags & IFA_F_TENTATIVE) && 1634 (!(score->ifa->flags & IFA_F_OPTIMISTIC))) 1635 continue; 1636 1637 score->addr_type = __ipv6_addr_type(&score->ifa->addr); 1638 1639 if (unlikely(score->addr_type == IPV6_ADDR_ANY || 1640 score->addr_type & IPV6_ADDR_MULTICAST)) { 1641 net_dbg_ratelimited("ADDRCONF: unspecified / multicast address assigned as unicast address on %s", 1642 idev->dev->name); 1643 continue; 1644 } 1645 1646 score->rule = -1; 1647 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX); 1648 1649 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) { 1650 int minihiscore, miniscore; 1651 1652 minihiscore = ipv6_get_saddr_eval(net, hiscore, dst, i); 1653 miniscore = ipv6_get_saddr_eval(net, score, dst, i); 1654 1655 if (minihiscore > miniscore) { 1656 if (i == IPV6_SADDR_RULE_SCOPE && 1657 score->scopedist > 0) { 1658 /* 1659 * special case: 1660 * each remaining entry 1661 * has too small (not enough) 1662 * scope, because ifa entries 1663 * are sorted by their scope 1664 * values. 1665 */ 1666 goto out; 1667 } 1668 break; 1669 } else if (minihiscore < miniscore) { 1670 swap(hiscore, score); 1671 hiscore_idx = 1 - hiscore_idx; 1672 1673 /* restore our iterator */ 1674 score->ifa = hiscore->ifa; 1675 1676 break; 1677 } 1678 } 1679 } 1680 out: 1681 return hiscore_idx; 1682 } 1683 1684 static int ipv6_get_saddr_master(struct net *net, 1685 const struct net_device *dst_dev, 1686 const struct net_device *master, 1687 struct ipv6_saddr_dst *dst, 1688 struct ipv6_saddr_score *scores, 1689 int hiscore_idx) 1690 { 1691 struct inet6_dev *idev; 1692 1693 idev = __in6_dev_get(dst_dev); 1694 if (idev) 1695 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev, 1696 scores, hiscore_idx); 1697 1698 idev = __in6_dev_get(master); 1699 if (idev) 1700 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev, 1701 scores, hiscore_idx); 1702 1703 return hiscore_idx; 1704 } 1705 1706 int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev, 1707 const struct in6_addr *daddr, unsigned int prefs, 1708 struct in6_addr *saddr) 1709 { 1710 struct ipv6_saddr_score scores[2], *hiscore; 1711 struct ipv6_saddr_dst dst; 1712 struct inet6_dev *idev; 1713 struct net_device *dev; 1714 int dst_type; 1715 bool use_oif_addr = false; 1716 int hiscore_idx = 0; 1717 int ret = 0; 1718 1719 dst_type = __ipv6_addr_type(daddr); 1720 dst.addr = daddr; 1721 dst.ifindex = dst_dev ? dst_dev->ifindex : 0; 1722 dst.scope = __ipv6_addr_src_scope(dst_type); 1723 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex); 1724 dst.prefs = prefs; 1725 1726 scores[hiscore_idx].rule = -1; 1727 scores[hiscore_idx].ifa = NULL; 1728 1729 rcu_read_lock(); 1730 1731 /* Candidate Source Address (section 4) 1732 * - multicast and link-local destination address, 1733 * the set of candidate source address MUST only 1734 * include addresses assigned to interfaces 1735 * belonging to the same link as the outgoing 1736 * interface. 1737 * (- For site-local destination addresses, the 1738 * set of candidate source addresses MUST only 1739 * include addresses assigned to interfaces 1740 * belonging to the same site as the outgoing 1741 * interface.) 1742 * - "It is RECOMMENDED that the candidate source addresses 1743 * be the set of unicast addresses assigned to the 1744 * interface that will be used to send to the destination 1745 * (the 'outgoing' interface)." (RFC 6724) 1746 */ 1747 if (dst_dev) { 1748 idev = __in6_dev_get(dst_dev); 1749 if ((dst_type & IPV6_ADDR_MULTICAST) || 1750 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL || 1751 (idev && idev->cnf.use_oif_addrs_only)) { 1752 use_oif_addr = true; 1753 } 1754 } 1755 1756 if (use_oif_addr) { 1757 if (idev) 1758 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx); 1759 } else { 1760 const struct net_device *master; 1761 int master_idx = 0; 1762 1763 /* if dst_dev exists and is enslaved to an L3 device, then 1764 * prefer addresses from dst_dev and then the master over 1765 * any other enslaved devices in the L3 domain. 1766 */ 1767 master = l3mdev_master_dev_rcu(dst_dev); 1768 if (master) { 1769 master_idx = master->ifindex; 1770 1771 hiscore_idx = ipv6_get_saddr_master(net, dst_dev, 1772 master, &dst, 1773 scores, hiscore_idx); 1774 1775 if (scores[hiscore_idx].ifa) 1776 goto out; 1777 } 1778 1779 for_each_netdev_rcu(net, dev) { 1780 /* only consider addresses on devices in the 1781 * same L3 domain 1782 */ 1783 if (l3mdev_master_ifindex_rcu(dev) != master_idx) 1784 continue; 1785 idev = __in6_dev_get(dev); 1786 if (!idev) 1787 continue; 1788 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx); 1789 } 1790 } 1791 1792 out: 1793 hiscore = &scores[hiscore_idx]; 1794 if (!hiscore->ifa) 1795 ret = -EADDRNOTAVAIL; 1796 else 1797 *saddr = hiscore->ifa->addr; 1798 1799 rcu_read_unlock(); 1800 return ret; 1801 } 1802 EXPORT_SYMBOL(ipv6_dev_get_saddr); 1803 1804 int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr, 1805 u32 banned_flags) 1806 { 1807 struct inet6_ifaddr *ifp; 1808 int err = -EADDRNOTAVAIL; 1809 1810 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) { 1811 if (ifp->scope > IFA_LINK) 1812 break; 1813 if (ifp->scope == IFA_LINK && 1814 !(ifp->flags & banned_flags)) { 1815 *addr = ifp->addr; 1816 err = 0; 1817 break; 1818 } 1819 } 1820 return err; 1821 } 1822 1823 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr, 1824 u32 banned_flags) 1825 { 1826 struct inet6_dev *idev; 1827 int err = -EADDRNOTAVAIL; 1828 1829 rcu_read_lock(); 1830 idev = __in6_dev_get(dev); 1831 if (idev) { 1832 read_lock_bh(&idev->lock); 1833 err = __ipv6_get_lladdr(idev, addr, banned_flags); 1834 read_unlock_bh(&idev->lock); 1835 } 1836 rcu_read_unlock(); 1837 return err; 1838 } 1839 1840 static int ipv6_count_addresses(const struct inet6_dev *idev) 1841 { 1842 const struct inet6_ifaddr *ifp; 1843 int cnt = 0; 1844 1845 rcu_read_lock(); 1846 list_for_each_entry_rcu(ifp, &idev->addr_list, if_list) 1847 cnt++; 1848 rcu_read_unlock(); 1849 return cnt; 1850 } 1851 1852 int ipv6_chk_addr(struct net *net, const struct in6_addr *addr, 1853 const struct net_device *dev, int strict) 1854 { 1855 return ipv6_chk_addr_and_flags(net, addr, dev, !dev, 1856 strict, IFA_F_TENTATIVE); 1857 } 1858 EXPORT_SYMBOL(ipv6_chk_addr); 1859 1860 /* device argument is used to find the L3 domain of interest. If 1861 * skip_dev_check is set, then the ifp device is not checked against 1862 * the passed in dev argument. So the 2 cases for addresses checks are: 1863 * 1. does the address exist in the L3 domain that dev is part of 1864 * (skip_dev_check = true), or 1865 * 1866 * 2. does the address exist on the specific device 1867 * (skip_dev_check = false) 1868 */ 1869 int ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr, 1870 const struct net_device *dev, bool skip_dev_check, 1871 int strict, u32 banned_flags) 1872 { 1873 unsigned int hash = inet6_addr_hash(net, addr); 1874 const struct net_device *l3mdev; 1875 struct inet6_ifaddr *ifp; 1876 u32 ifp_flags; 1877 1878 rcu_read_lock(); 1879 1880 l3mdev = l3mdev_master_dev_rcu(dev); 1881 if (skip_dev_check) 1882 dev = NULL; 1883 1884 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) { 1885 if (!net_eq(dev_net(ifp->idev->dev), net)) 1886 continue; 1887 1888 if (l3mdev_master_dev_rcu(ifp->idev->dev) != l3mdev) 1889 continue; 1890 1891 /* Decouple optimistic from tentative for evaluation here. 1892 * Ban optimistic addresses explicitly, when required. 1893 */ 1894 ifp_flags = (ifp->flags&IFA_F_OPTIMISTIC) 1895 ? (ifp->flags&~IFA_F_TENTATIVE) 1896 : ifp->flags; 1897 if (ipv6_addr_equal(&ifp->addr, addr) && 1898 !(ifp_flags&banned_flags) && 1899 (!dev || ifp->idev->dev == dev || 1900 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) { 1901 rcu_read_unlock(); 1902 return 1; 1903 } 1904 } 1905 1906 rcu_read_unlock(); 1907 return 0; 1908 } 1909 EXPORT_SYMBOL(ipv6_chk_addr_and_flags); 1910 1911 1912 /* Compares an address/prefix_len with addresses on device @dev. 1913 * If one is found it returns true. 1914 */ 1915 bool ipv6_chk_custom_prefix(const struct in6_addr *addr, 1916 const unsigned int prefix_len, struct net_device *dev) 1917 { 1918 const struct inet6_ifaddr *ifa; 1919 const struct inet6_dev *idev; 1920 bool ret = false; 1921 1922 rcu_read_lock(); 1923 idev = __in6_dev_get(dev); 1924 if (idev) { 1925 list_for_each_entry_rcu(ifa, &idev->addr_list, if_list) { 1926 ret = ipv6_prefix_equal(addr, &ifa->addr, prefix_len); 1927 if (ret) 1928 break; 1929 } 1930 } 1931 rcu_read_unlock(); 1932 1933 return ret; 1934 } 1935 EXPORT_SYMBOL(ipv6_chk_custom_prefix); 1936 1937 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev) 1938 { 1939 const struct inet6_ifaddr *ifa; 1940 const struct inet6_dev *idev; 1941 int onlink; 1942 1943 onlink = 0; 1944 rcu_read_lock(); 1945 idev = __in6_dev_get(dev); 1946 if (idev) { 1947 list_for_each_entry_rcu(ifa, &idev->addr_list, if_list) { 1948 onlink = ipv6_prefix_equal(addr, &ifa->addr, 1949 ifa->prefix_len); 1950 if (onlink) 1951 break; 1952 } 1953 } 1954 rcu_read_unlock(); 1955 return onlink; 1956 } 1957 EXPORT_SYMBOL(ipv6_chk_prefix); 1958 1959 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr, 1960 struct net_device *dev, int strict) 1961 { 1962 unsigned int hash = inet6_addr_hash(net, addr); 1963 struct inet6_ifaddr *ifp, *result = NULL; 1964 1965 rcu_read_lock(); 1966 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) { 1967 if (!net_eq(dev_net(ifp->idev->dev), net)) 1968 continue; 1969 if (ipv6_addr_equal(&ifp->addr, addr)) { 1970 if (!dev || ifp->idev->dev == dev || 1971 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) { 1972 result = ifp; 1973 in6_ifa_hold(ifp); 1974 break; 1975 } 1976 } 1977 } 1978 rcu_read_unlock(); 1979 1980 return result; 1981 } 1982 1983 /* Gets referenced address, destroys ifaddr */ 1984 1985 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed) 1986 { 1987 if (dad_failed) 1988 ifp->flags |= IFA_F_DADFAILED; 1989 1990 if (ifp->flags&IFA_F_TEMPORARY) { 1991 struct inet6_ifaddr *ifpub; 1992 spin_lock_bh(&ifp->lock); 1993 ifpub = ifp->ifpub; 1994 if (ifpub) { 1995 in6_ifa_hold(ifpub); 1996 spin_unlock_bh(&ifp->lock); 1997 ipv6_create_tempaddr(ifpub, ifp, true); 1998 in6_ifa_put(ifpub); 1999 } else { 2000 spin_unlock_bh(&ifp->lock); 2001 } 2002 ipv6_del_addr(ifp); 2003 } else if (ifp->flags&IFA_F_PERMANENT || !dad_failed) { 2004 spin_lock_bh(&ifp->lock); 2005 addrconf_del_dad_work(ifp); 2006 ifp->flags |= IFA_F_TENTATIVE; 2007 if (dad_failed) 2008 ifp->flags &= ~IFA_F_OPTIMISTIC; 2009 spin_unlock_bh(&ifp->lock); 2010 if (dad_failed) 2011 ipv6_ifa_notify(0, ifp); 2012 in6_ifa_put(ifp); 2013 } else { 2014 ipv6_del_addr(ifp); 2015 } 2016 } 2017 2018 static int addrconf_dad_end(struct inet6_ifaddr *ifp) 2019 { 2020 int err = -ENOENT; 2021 2022 spin_lock_bh(&ifp->lock); 2023 if (ifp->state == INET6_IFADDR_STATE_DAD) { 2024 ifp->state = INET6_IFADDR_STATE_POSTDAD; 2025 err = 0; 2026 } 2027 spin_unlock_bh(&ifp->lock); 2028 2029 return err; 2030 } 2031 2032 void addrconf_dad_failure(struct sk_buff *skb, struct inet6_ifaddr *ifp) 2033 { 2034 struct inet6_dev *idev = ifp->idev; 2035 struct net *net = dev_net(ifp->idev->dev); 2036 2037 if (addrconf_dad_end(ifp)) { 2038 in6_ifa_put(ifp); 2039 return; 2040 } 2041 2042 net_info_ratelimited("%s: IPv6 duplicate address %pI6c used by %pM detected!\n", 2043 ifp->idev->dev->name, &ifp->addr, eth_hdr(skb)->h_source); 2044 2045 spin_lock_bh(&ifp->lock); 2046 2047 if (ifp->flags & IFA_F_STABLE_PRIVACY) { 2048 struct in6_addr new_addr; 2049 struct inet6_ifaddr *ifp2; 2050 int retries = ifp->stable_privacy_retry + 1; 2051 struct ifa6_config cfg = { 2052 .pfx = &new_addr, 2053 .plen = ifp->prefix_len, 2054 .ifa_flags = ifp->flags, 2055 .valid_lft = ifp->valid_lft, 2056 .preferred_lft = ifp->prefered_lft, 2057 .scope = ifp->scope, 2058 }; 2059 2060 if (retries > net->ipv6.sysctl.idgen_retries) { 2061 net_info_ratelimited("%s: privacy stable address generation failed because of DAD conflicts!\n", 2062 ifp->idev->dev->name); 2063 goto errdad; 2064 } 2065 2066 new_addr = ifp->addr; 2067 if (ipv6_generate_stable_address(&new_addr, retries, 2068 idev)) 2069 goto errdad; 2070 2071 spin_unlock_bh(&ifp->lock); 2072 2073 if (idev->cnf.max_addresses && 2074 ipv6_count_addresses(idev) >= 2075 idev->cnf.max_addresses) 2076 goto lock_errdad; 2077 2078 net_info_ratelimited("%s: generating new stable privacy address because of DAD conflict\n", 2079 ifp->idev->dev->name); 2080 2081 ifp2 = ipv6_add_addr(idev, &cfg, false, NULL); 2082 if (IS_ERR(ifp2)) 2083 goto lock_errdad; 2084 2085 spin_lock_bh(&ifp2->lock); 2086 ifp2->stable_privacy_retry = retries; 2087 ifp2->state = INET6_IFADDR_STATE_PREDAD; 2088 spin_unlock_bh(&ifp2->lock); 2089 2090 addrconf_mod_dad_work(ifp2, net->ipv6.sysctl.idgen_delay); 2091 in6_ifa_put(ifp2); 2092 lock_errdad: 2093 spin_lock_bh(&ifp->lock); 2094 } 2095 2096 errdad: 2097 /* transition from _POSTDAD to _ERRDAD */ 2098 ifp->state = INET6_IFADDR_STATE_ERRDAD; 2099 spin_unlock_bh(&ifp->lock); 2100 2101 addrconf_mod_dad_work(ifp, 0); 2102 in6_ifa_put(ifp); 2103 } 2104 2105 /* Join to solicited addr multicast group. 2106 * caller must hold RTNL */ 2107 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr) 2108 { 2109 struct in6_addr maddr; 2110 2111 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP)) 2112 return; 2113 2114 addrconf_addr_solict_mult(addr, &maddr); 2115 ipv6_dev_mc_inc(dev, &maddr); 2116 } 2117 2118 /* caller must hold RTNL */ 2119 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr) 2120 { 2121 struct in6_addr maddr; 2122 2123 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP)) 2124 return; 2125 2126 addrconf_addr_solict_mult(addr, &maddr); 2127 __ipv6_dev_mc_dec(idev, &maddr); 2128 } 2129 2130 /* caller must hold RTNL */ 2131 static void addrconf_join_anycast(struct inet6_ifaddr *ifp) 2132 { 2133 struct in6_addr addr; 2134 2135 if (ifp->prefix_len >= 127) /* RFC 6164 */ 2136 return; 2137 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len); 2138 if (ipv6_addr_any(&addr)) 2139 return; 2140 __ipv6_dev_ac_inc(ifp->idev, &addr); 2141 } 2142 2143 /* caller must hold RTNL */ 2144 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp) 2145 { 2146 struct in6_addr addr; 2147 2148 if (ifp->prefix_len >= 127) /* RFC 6164 */ 2149 return; 2150 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len); 2151 if (ipv6_addr_any(&addr)) 2152 return; 2153 __ipv6_dev_ac_dec(ifp->idev, &addr); 2154 } 2155 2156 static int addrconf_ifid_6lowpan(u8 *eui, struct net_device *dev) 2157 { 2158 switch (dev->addr_len) { 2159 case ETH_ALEN: 2160 memcpy(eui, dev->dev_addr, 3); 2161 eui[3] = 0xFF; 2162 eui[4] = 0xFE; 2163 memcpy(eui + 5, dev->dev_addr + 3, 3); 2164 break; 2165 case EUI64_ADDR_LEN: 2166 memcpy(eui, dev->dev_addr, EUI64_ADDR_LEN); 2167 eui[0] ^= 2; 2168 break; 2169 default: 2170 return -1; 2171 } 2172 2173 return 0; 2174 } 2175 2176 static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev) 2177 { 2178 union fwnet_hwaddr *ha; 2179 2180 if (dev->addr_len != FWNET_ALEN) 2181 return -1; 2182 2183 ha = (union fwnet_hwaddr *)dev->dev_addr; 2184 2185 memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id)); 2186 eui[0] ^= 2; 2187 return 0; 2188 } 2189 2190 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev) 2191 { 2192 /* XXX: inherit EUI-64 from other interface -- yoshfuji */ 2193 if (dev->addr_len != ARCNET_ALEN) 2194 return -1; 2195 memset(eui, 0, 7); 2196 eui[7] = *(u8 *)dev->dev_addr; 2197 return 0; 2198 } 2199 2200 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev) 2201 { 2202 if (dev->addr_len != INFINIBAND_ALEN) 2203 return -1; 2204 memcpy(eui, dev->dev_addr + 12, 8); 2205 eui[0] |= 2; 2206 return 0; 2207 } 2208 2209 static int __ipv6_isatap_ifid(u8 *eui, __be32 addr) 2210 { 2211 if (addr == 0) 2212 return -1; 2213 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) || 2214 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) || 2215 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) || 2216 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) || 2217 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) || 2218 ipv4_is_lbcast(addr)) ? 0x00 : 0x02; 2219 eui[1] = 0; 2220 eui[2] = 0x5E; 2221 eui[3] = 0xFE; 2222 memcpy(eui + 4, &addr, 4); 2223 return 0; 2224 } 2225 2226 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev) 2227 { 2228 if (dev->priv_flags & IFF_ISATAP) 2229 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr); 2230 return -1; 2231 } 2232 2233 static int addrconf_ifid_gre(u8 *eui, struct net_device *dev) 2234 { 2235 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr); 2236 } 2237 2238 static int addrconf_ifid_ip6tnl(u8 *eui, struct net_device *dev) 2239 { 2240 memcpy(eui, dev->perm_addr, 3); 2241 memcpy(eui + 5, dev->perm_addr + 3, 3); 2242 eui[3] = 0xFF; 2243 eui[4] = 0xFE; 2244 eui[0] ^= 2; 2245 return 0; 2246 } 2247 2248 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev) 2249 { 2250 switch (dev->type) { 2251 case ARPHRD_ETHER: 2252 case ARPHRD_FDDI: 2253 return addrconf_ifid_eui48(eui, dev); 2254 case ARPHRD_ARCNET: 2255 return addrconf_ifid_arcnet(eui, dev); 2256 case ARPHRD_INFINIBAND: 2257 return addrconf_ifid_infiniband(eui, dev); 2258 case ARPHRD_SIT: 2259 return addrconf_ifid_sit(eui, dev); 2260 case ARPHRD_IPGRE: 2261 case ARPHRD_TUNNEL: 2262 return addrconf_ifid_gre(eui, dev); 2263 case ARPHRD_6LOWPAN: 2264 return addrconf_ifid_6lowpan(eui, dev); 2265 case ARPHRD_IEEE1394: 2266 return addrconf_ifid_ieee1394(eui, dev); 2267 case ARPHRD_TUNNEL6: 2268 case ARPHRD_IP6GRE: 2269 case ARPHRD_RAWIP: 2270 return addrconf_ifid_ip6tnl(eui, dev); 2271 } 2272 return -1; 2273 } 2274 2275 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev) 2276 { 2277 int err = -1; 2278 struct inet6_ifaddr *ifp; 2279 2280 read_lock_bh(&idev->lock); 2281 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) { 2282 if (ifp->scope > IFA_LINK) 2283 break; 2284 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) { 2285 memcpy(eui, ifp->addr.s6_addr+8, 8); 2286 err = 0; 2287 break; 2288 } 2289 } 2290 read_unlock_bh(&idev->lock); 2291 return err; 2292 } 2293 2294 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */ 2295 static void ipv6_regen_rndid(struct inet6_dev *idev) 2296 { 2297 regen: 2298 get_random_bytes(idev->rndid, sizeof(idev->rndid)); 2299 idev->rndid[0] &= ~0x02; 2300 2301 /* 2302 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>: 2303 * check if generated address is not inappropriate 2304 * 2305 * - Reserved subnet anycast (RFC 2526) 2306 * 11111101 11....11 1xxxxxxx 2307 * - ISATAP (RFC4214) 6.1 2308 * 00-00-5E-FE-xx-xx-xx-xx 2309 * - value 0 2310 * - XXX: already assigned to an address on the device 2311 */ 2312 if (idev->rndid[0] == 0xfd && 2313 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff && 2314 (idev->rndid[7]&0x80)) 2315 goto regen; 2316 if ((idev->rndid[0]|idev->rndid[1]) == 0) { 2317 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe) 2318 goto regen; 2319 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00) 2320 goto regen; 2321 } 2322 } 2323 2324 static void ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) 2325 { 2326 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0) 2327 ipv6_regen_rndid(idev); 2328 } 2329 2330 /* 2331 * Add prefix route. 2332 */ 2333 2334 static void 2335 addrconf_prefix_route(struct in6_addr *pfx, int plen, u32 metric, 2336 struct net_device *dev, unsigned long expires, 2337 u32 flags, gfp_t gfp_flags) 2338 { 2339 struct fib6_config cfg = { 2340 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX, 2341 .fc_metric = metric ? : IP6_RT_PRIO_ADDRCONF, 2342 .fc_ifindex = dev->ifindex, 2343 .fc_expires = expires, 2344 .fc_dst_len = plen, 2345 .fc_flags = RTF_UP | flags, 2346 .fc_nlinfo.nl_net = dev_net(dev), 2347 .fc_protocol = RTPROT_KERNEL, 2348 .fc_type = RTN_UNICAST, 2349 }; 2350 2351 cfg.fc_dst = *pfx; 2352 2353 /* Prevent useless cloning on PtP SIT. 2354 This thing is done here expecting that the whole 2355 class of non-broadcast devices need not cloning. 2356 */ 2357 #if IS_ENABLED(CONFIG_IPV6_SIT) 2358 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT)) 2359 cfg.fc_flags |= RTF_NONEXTHOP; 2360 #endif 2361 2362 ip6_route_add(&cfg, gfp_flags, NULL); 2363 } 2364 2365 2366 static struct fib6_info *addrconf_get_prefix_route(const struct in6_addr *pfx, 2367 int plen, 2368 const struct net_device *dev, 2369 u32 flags, u32 noflags) 2370 { 2371 struct fib6_node *fn; 2372 struct fib6_info *rt = NULL; 2373 struct fib6_table *table; 2374 u32 tb_id = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX; 2375 2376 table = fib6_get_table(dev_net(dev), tb_id); 2377 if (!table) 2378 return NULL; 2379 2380 rcu_read_lock(); 2381 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0, true); 2382 if (!fn) 2383 goto out; 2384 2385 for_each_fib6_node_rt_rcu(fn) { 2386 if (rt->fib6_nh.nh_dev->ifindex != dev->ifindex) 2387 continue; 2388 if ((rt->fib6_flags & flags) != flags) 2389 continue; 2390 if ((rt->fib6_flags & noflags) != 0) 2391 continue; 2392 if (!fib6_info_hold_safe(rt)) 2393 continue; 2394 break; 2395 } 2396 out: 2397 rcu_read_unlock(); 2398 return rt; 2399 } 2400 2401 2402 /* Create "default" multicast route to the interface */ 2403 2404 static void addrconf_add_mroute(struct net_device *dev) 2405 { 2406 struct fib6_config cfg = { 2407 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_LOCAL, 2408 .fc_metric = IP6_RT_PRIO_ADDRCONF, 2409 .fc_ifindex = dev->ifindex, 2410 .fc_dst_len = 8, 2411 .fc_flags = RTF_UP, 2412 .fc_type = RTN_UNICAST, 2413 .fc_nlinfo.nl_net = dev_net(dev), 2414 }; 2415 2416 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0); 2417 2418 ip6_route_add(&cfg, GFP_KERNEL, NULL); 2419 } 2420 2421 static struct inet6_dev *addrconf_add_dev(struct net_device *dev) 2422 { 2423 struct inet6_dev *idev; 2424 2425 ASSERT_RTNL(); 2426 2427 idev = ipv6_find_idev(dev); 2428 if (!idev) 2429 return ERR_PTR(-ENOBUFS); 2430 2431 if (idev->cnf.disable_ipv6) 2432 return ERR_PTR(-EACCES); 2433 2434 /* Add default multicast route */ 2435 if (!(dev->flags & IFF_LOOPBACK) && !netif_is_l3_master(dev)) 2436 addrconf_add_mroute(dev); 2437 2438 return idev; 2439 } 2440 2441 static void manage_tempaddrs(struct inet6_dev *idev, 2442 struct inet6_ifaddr *ifp, 2443 __u32 valid_lft, __u32 prefered_lft, 2444 bool create, unsigned long now) 2445 { 2446 u32 flags; 2447 struct inet6_ifaddr *ift; 2448 2449 read_lock_bh(&idev->lock); 2450 /* update all temporary addresses in the list */ 2451 list_for_each_entry(ift, &idev->tempaddr_list, tmp_list) { 2452 int age, max_valid, max_prefered; 2453 2454 if (ifp != ift->ifpub) 2455 continue; 2456 2457 /* RFC 4941 section 3.3: 2458 * If a received option will extend the lifetime of a public 2459 * address, the lifetimes of temporary addresses should 2460 * be extended, subject to the overall constraint that no 2461 * temporary addresses should ever remain "valid" or "preferred" 2462 * for a time longer than (TEMP_VALID_LIFETIME) or 2463 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), respectively. 2464 */ 2465 age = (now - ift->cstamp) / HZ; 2466 max_valid = idev->cnf.temp_valid_lft - age; 2467 if (max_valid < 0) 2468 max_valid = 0; 2469 2470 max_prefered = idev->cnf.temp_prefered_lft - 2471 idev->desync_factor - age; 2472 if (max_prefered < 0) 2473 max_prefered = 0; 2474 2475 if (valid_lft > max_valid) 2476 valid_lft = max_valid; 2477 2478 if (prefered_lft > max_prefered) 2479 prefered_lft = max_prefered; 2480 2481 spin_lock(&ift->lock); 2482 flags = ift->flags; 2483 ift->valid_lft = valid_lft; 2484 ift->prefered_lft = prefered_lft; 2485 ift->tstamp = now; 2486 if (prefered_lft > 0) 2487 ift->flags &= ~IFA_F_DEPRECATED; 2488 2489 spin_unlock(&ift->lock); 2490 if (!(flags&IFA_F_TENTATIVE)) 2491 ipv6_ifa_notify(0, ift); 2492 } 2493 2494 if ((create || list_empty(&idev->tempaddr_list)) && 2495 idev->cnf.use_tempaddr > 0) { 2496 /* When a new public address is created as described 2497 * in [ADDRCONF], also create a new temporary address. 2498 * Also create a temporary address if it's enabled but 2499 * no temporary address currently exists. 2500 */ 2501 read_unlock_bh(&idev->lock); 2502 ipv6_create_tempaddr(ifp, NULL, false); 2503 } else { 2504 read_unlock_bh(&idev->lock); 2505 } 2506 } 2507 2508 static bool is_addr_mode_generate_stable(struct inet6_dev *idev) 2509 { 2510 return idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY || 2511 idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_RANDOM; 2512 } 2513 2514 int addrconf_prefix_rcv_add_addr(struct net *net, struct net_device *dev, 2515 const struct prefix_info *pinfo, 2516 struct inet6_dev *in6_dev, 2517 const struct in6_addr *addr, int addr_type, 2518 u32 addr_flags, bool sllao, bool tokenized, 2519 __u32 valid_lft, u32 prefered_lft) 2520 { 2521 struct inet6_ifaddr *ifp = ipv6_get_ifaddr(net, addr, dev, 1); 2522 int create = 0, update_lft = 0; 2523 2524 if (!ifp && valid_lft) { 2525 int max_addresses = in6_dev->cnf.max_addresses; 2526 struct ifa6_config cfg = { 2527 .pfx = addr, 2528 .plen = pinfo->prefix_len, 2529 .ifa_flags = addr_flags, 2530 .valid_lft = valid_lft, 2531 .preferred_lft = prefered_lft, 2532 .scope = addr_type & IPV6_ADDR_SCOPE_MASK, 2533 }; 2534 2535 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 2536 if ((net->ipv6.devconf_all->optimistic_dad || 2537 in6_dev->cnf.optimistic_dad) && 2538 !net->ipv6.devconf_all->forwarding && sllao) 2539 cfg.ifa_flags |= IFA_F_OPTIMISTIC; 2540 #endif 2541 2542 /* Do not allow to create too much of autoconfigured 2543 * addresses; this would be too easy way to crash kernel. 2544 */ 2545 if (!max_addresses || 2546 ipv6_count_addresses(in6_dev) < max_addresses) 2547 ifp = ipv6_add_addr(in6_dev, &cfg, false, NULL); 2548 2549 if (IS_ERR_OR_NULL(ifp)) 2550 return -1; 2551 2552 create = 1; 2553 spin_lock_bh(&ifp->lock); 2554 ifp->flags |= IFA_F_MANAGETEMPADDR; 2555 ifp->cstamp = jiffies; 2556 ifp->tokenized = tokenized; 2557 spin_unlock_bh(&ifp->lock); 2558 addrconf_dad_start(ifp); 2559 } 2560 2561 if (ifp) { 2562 u32 flags; 2563 unsigned long now; 2564 u32 stored_lft; 2565 2566 /* update lifetime (RFC2462 5.5.3 e) */ 2567 spin_lock_bh(&ifp->lock); 2568 now = jiffies; 2569 if (ifp->valid_lft > (now - ifp->tstamp) / HZ) 2570 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ; 2571 else 2572 stored_lft = 0; 2573 if (!create && stored_lft) { 2574 const u32 minimum_lft = min_t(u32, 2575 stored_lft, MIN_VALID_LIFETIME); 2576 valid_lft = max(valid_lft, minimum_lft); 2577 2578 /* RFC4862 Section 5.5.3e: 2579 * "Note that the preferred lifetime of the 2580 * corresponding address is always reset to 2581 * the Preferred Lifetime in the received 2582 * Prefix Information option, regardless of 2583 * whether the valid lifetime is also reset or 2584 * ignored." 2585 * 2586 * So we should always update prefered_lft here. 2587 */ 2588 update_lft = 1; 2589 } 2590 2591 if (update_lft) { 2592 ifp->valid_lft = valid_lft; 2593 ifp->prefered_lft = prefered_lft; 2594 ifp->tstamp = now; 2595 flags = ifp->flags; 2596 ifp->flags &= ~IFA_F_DEPRECATED; 2597 spin_unlock_bh(&ifp->lock); 2598 2599 if (!(flags&IFA_F_TENTATIVE)) 2600 ipv6_ifa_notify(0, ifp); 2601 } else 2602 spin_unlock_bh(&ifp->lock); 2603 2604 manage_tempaddrs(in6_dev, ifp, valid_lft, prefered_lft, 2605 create, now); 2606 2607 in6_ifa_put(ifp); 2608 addrconf_verify(); 2609 } 2610 2611 return 0; 2612 } 2613 EXPORT_SYMBOL_GPL(addrconf_prefix_rcv_add_addr); 2614 2615 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao) 2616 { 2617 struct prefix_info *pinfo; 2618 __u32 valid_lft; 2619 __u32 prefered_lft; 2620 int addr_type, err; 2621 u32 addr_flags = 0; 2622 struct inet6_dev *in6_dev; 2623 struct net *net = dev_net(dev); 2624 2625 pinfo = (struct prefix_info *) opt; 2626 2627 if (len < sizeof(struct prefix_info)) { 2628 netdev_dbg(dev, "addrconf: prefix option too short\n"); 2629 return; 2630 } 2631 2632 /* 2633 * Validation checks ([ADDRCONF], page 19) 2634 */ 2635 2636 addr_type = ipv6_addr_type(&pinfo->prefix); 2637 2638 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL)) 2639 return; 2640 2641 valid_lft = ntohl(pinfo->valid); 2642 prefered_lft = ntohl(pinfo->prefered); 2643 2644 if (prefered_lft > valid_lft) { 2645 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n"); 2646 return; 2647 } 2648 2649 in6_dev = in6_dev_get(dev); 2650 2651 if (!in6_dev) { 2652 net_dbg_ratelimited("addrconf: device %s not configured\n", 2653 dev->name); 2654 return; 2655 } 2656 2657 /* 2658 * Two things going on here: 2659 * 1) Add routes for on-link prefixes 2660 * 2) Configure prefixes with the auto flag set 2661 */ 2662 2663 if (pinfo->onlink) { 2664 struct fib6_info *rt; 2665 unsigned long rt_expires; 2666 2667 /* Avoid arithmetic overflow. Really, we could 2668 * save rt_expires in seconds, likely valid_lft, 2669 * but it would require division in fib gc, that it 2670 * not good. 2671 */ 2672 if (HZ > USER_HZ) 2673 rt_expires = addrconf_timeout_fixup(valid_lft, HZ); 2674 else 2675 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ); 2676 2677 if (addrconf_finite_timeout(rt_expires)) 2678 rt_expires *= HZ; 2679 2680 rt = addrconf_get_prefix_route(&pinfo->prefix, 2681 pinfo->prefix_len, 2682 dev, 2683 RTF_ADDRCONF | RTF_PREFIX_RT, 2684 RTF_GATEWAY | RTF_DEFAULT); 2685 2686 if (rt) { 2687 /* Autoconf prefix route */ 2688 if (valid_lft == 0) { 2689 ip6_del_rt(net, rt); 2690 rt = NULL; 2691 } else if (addrconf_finite_timeout(rt_expires)) { 2692 /* not infinity */ 2693 fib6_set_expires(rt, jiffies + rt_expires); 2694 } else { 2695 fib6_clean_expires(rt); 2696 } 2697 } else if (valid_lft) { 2698 clock_t expires = 0; 2699 int flags = RTF_ADDRCONF | RTF_PREFIX_RT; 2700 if (addrconf_finite_timeout(rt_expires)) { 2701 /* not infinity */ 2702 flags |= RTF_EXPIRES; 2703 expires = jiffies_to_clock_t(rt_expires); 2704 } 2705 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len, 2706 0, dev, expires, flags, 2707 GFP_ATOMIC); 2708 } 2709 fib6_info_release(rt); 2710 } 2711 2712 /* Try to figure out our local address for this prefix */ 2713 2714 if (pinfo->autoconf && in6_dev->cnf.autoconf) { 2715 struct in6_addr addr; 2716 bool tokenized = false, dev_addr_generated = false; 2717 2718 if (pinfo->prefix_len == 64) { 2719 memcpy(&addr, &pinfo->prefix, 8); 2720 2721 if (!ipv6_addr_any(&in6_dev->token)) { 2722 read_lock_bh(&in6_dev->lock); 2723 memcpy(addr.s6_addr + 8, 2724 in6_dev->token.s6_addr + 8, 8); 2725 read_unlock_bh(&in6_dev->lock); 2726 tokenized = true; 2727 } else if (is_addr_mode_generate_stable(in6_dev) && 2728 !ipv6_generate_stable_address(&addr, 0, 2729 in6_dev)) { 2730 addr_flags |= IFA_F_STABLE_PRIVACY; 2731 goto ok; 2732 } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) && 2733 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) { 2734 goto put; 2735 } else { 2736 dev_addr_generated = true; 2737 } 2738 goto ok; 2739 } 2740 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n", 2741 pinfo->prefix_len); 2742 goto put; 2743 2744 ok: 2745 err = addrconf_prefix_rcv_add_addr(net, dev, pinfo, in6_dev, 2746 &addr, addr_type, 2747 addr_flags, sllao, 2748 tokenized, valid_lft, 2749 prefered_lft); 2750 if (err) 2751 goto put; 2752 2753 /* Ignore error case here because previous prefix add addr was 2754 * successful which will be notified. 2755 */ 2756 ndisc_ops_prefix_rcv_add_addr(net, dev, pinfo, in6_dev, &addr, 2757 addr_type, addr_flags, sllao, 2758 tokenized, valid_lft, 2759 prefered_lft, 2760 dev_addr_generated); 2761 } 2762 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo); 2763 put: 2764 in6_dev_put(in6_dev); 2765 } 2766 2767 /* 2768 * Set destination address. 2769 * Special case for SIT interfaces where we create a new "virtual" 2770 * device. 2771 */ 2772 int addrconf_set_dstaddr(struct net *net, void __user *arg) 2773 { 2774 struct in6_ifreq ireq; 2775 struct net_device *dev; 2776 int err = -EINVAL; 2777 2778 rtnl_lock(); 2779 2780 err = -EFAULT; 2781 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2782 goto err_exit; 2783 2784 dev = __dev_get_by_index(net, ireq.ifr6_ifindex); 2785 2786 err = -ENODEV; 2787 if (!dev) 2788 goto err_exit; 2789 2790 #if IS_ENABLED(CONFIG_IPV6_SIT) 2791 if (dev->type == ARPHRD_SIT) { 2792 const struct net_device_ops *ops = dev->netdev_ops; 2793 struct ifreq ifr; 2794 struct ip_tunnel_parm p; 2795 2796 err = -EADDRNOTAVAIL; 2797 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4)) 2798 goto err_exit; 2799 2800 memset(&p, 0, sizeof(p)); 2801 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3]; 2802 p.iph.saddr = 0; 2803 p.iph.version = 4; 2804 p.iph.ihl = 5; 2805 p.iph.protocol = IPPROTO_IPV6; 2806 p.iph.ttl = 64; 2807 ifr.ifr_ifru.ifru_data = (__force void __user *)&p; 2808 2809 if (ops->ndo_do_ioctl) { 2810 mm_segment_t oldfs = get_fs(); 2811 2812 set_fs(KERNEL_DS); 2813 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL); 2814 set_fs(oldfs); 2815 } else 2816 err = -EOPNOTSUPP; 2817 2818 if (err == 0) { 2819 err = -ENOBUFS; 2820 dev = __dev_get_by_name(net, p.name); 2821 if (!dev) 2822 goto err_exit; 2823 err = dev_open(dev, NULL); 2824 } 2825 } 2826 #endif 2827 2828 err_exit: 2829 rtnl_unlock(); 2830 return err; 2831 } 2832 2833 static int ipv6_mc_config(struct sock *sk, bool join, 2834 const struct in6_addr *addr, int ifindex) 2835 { 2836 int ret; 2837 2838 ASSERT_RTNL(); 2839 2840 lock_sock(sk); 2841 if (join) 2842 ret = ipv6_sock_mc_join(sk, ifindex, addr); 2843 else 2844 ret = ipv6_sock_mc_drop(sk, ifindex, addr); 2845 release_sock(sk); 2846 2847 return ret; 2848 } 2849 2850 /* 2851 * Manual configuration of address on an interface 2852 */ 2853 static int inet6_addr_add(struct net *net, int ifindex, 2854 struct ifa6_config *cfg, 2855 struct netlink_ext_ack *extack) 2856 { 2857 struct inet6_ifaddr *ifp; 2858 struct inet6_dev *idev; 2859 struct net_device *dev; 2860 unsigned long timeout; 2861 clock_t expires; 2862 u32 flags; 2863 2864 ASSERT_RTNL(); 2865 2866 if (cfg->plen > 128) 2867 return -EINVAL; 2868 2869 /* check the lifetime */ 2870 if (!cfg->valid_lft || cfg->preferred_lft > cfg->valid_lft) 2871 return -EINVAL; 2872 2873 if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR && cfg->plen != 64) 2874 return -EINVAL; 2875 2876 dev = __dev_get_by_index(net, ifindex); 2877 if (!dev) 2878 return -ENODEV; 2879 2880 idev = addrconf_add_dev(dev); 2881 if (IS_ERR(idev)) 2882 return PTR_ERR(idev); 2883 2884 if (cfg->ifa_flags & IFA_F_MCAUTOJOIN) { 2885 int ret = ipv6_mc_config(net->ipv6.mc_autojoin_sk, 2886 true, cfg->pfx, ifindex); 2887 2888 if (ret < 0) 2889 return ret; 2890 } 2891 2892 cfg->scope = ipv6_addr_scope(cfg->pfx); 2893 2894 timeout = addrconf_timeout_fixup(cfg->valid_lft, HZ); 2895 if (addrconf_finite_timeout(timeout)) { 2896 expires = jiffies_to_clock_t(timeout * HZ); 2897 cfg->valid_lft = timeout; 2898 flags = RTF_EXPIRES; 2899 } else { 2900 expires = 0; 2901 flags = 0; 2902 cfg->ifa_flags |= IFA_F_PERMANENT; 2903 } 2904 2905 timeout = addrconf_timeout_fixup(cfg->preferred_lft, HZ); 2906 if (addrconf_finite_timeout(timeout)) { 2907 if (timeout == 0) 2908 cfg->ifa_flags |= IFA_F_DEPRECATED; 2909 cfg->preferred_lft = timeout; 2910 } 2911 2912 ifp = ipv6_add_addr(idev, cfg, true, extack); 2913 if (!IS_ERR(ifp)) { 2914 if (!(cfg->ifa_flags & IFA_F_NOPREFIXROUTE)) { 2915 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, 2916 ifp->rt_priority, dev, expires, 2917 flags, GFP_KERNEL); 2918 } 2919 2920 /* Send a netlink notification if DAD is enabled and 2921 * optimistic flag is not set 2922 */ 2923 if (!(ifp->flags & (IFA_F_OPTIMISTIC | IFA_F_NODAD))) 2924 ipv6_ifa_notify(0, ifp); 2925 /* 2926 * Note that section 3.1 of RFC 4429 indicates 2927 * that the Optimistic flag should not be set for 2928 * manually configured addresses 2929 */ 2930 addrconf_dad_start(ifp); 2931 if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR) 2932 manage_tempaddrs(idev, ifp, cfg->valid_lft, 2933 cfg->preferred_lft, true, jiffies); 2934 in6_ifa_put(ifp); 2935 addrconf_verify_rtnl(); 2936 return 0; 2937 } else if (cfg->ifa_flags & IFA_F_MCAUTOJOIN) { 2938 ipv6_mc_config(net->ipv6.mc_autojoin_sk, false, 2939 cfg->pfx, ifindex); 2940 } 2941 2942 return PTR_ERR(ifp); 2943 } 2944 2945 static int inet6_addr_del(struct net *net, int ifindex, u32 ifa_flags, 2946 const struct in6_addr *pfx, unsigned int plen) 2947 { 2948 struct inet6_ifaddr *ifp; 2949 struct inet6_dev *idev; 2950 struct net_device *dev; 2951 2952 if (plen > 128) 2953 return -EINVAL; 2954 2955 dev = __dev_get_by_index(net, ifindex); 2956 if (!dev) 2957 return -ENODEV; 2958 2959 idev = __in6_dev_get(dev); 2960 if (!idev) 2961 return -ENXIO; 2962 2963 read_lock_bh(&idev->lock); 2964 list_for_each_entry(ifp, &idev->addr_list, if_list) { 2965 if (ifp->prefix_len == plen && 2966 ipv6_addr_equal(pfx, &ifp->addr)) { 2967 in6_ifa_hold(ifp); 2968 read_unlock_bh(&idev->lock); 2969 2970 if (!(ifp->flags & IFA_F_TEMPORARY) && 2971 (ifa_flags & IFA_F_MANAGETEMPADDR)) 2972 manage_tempaddrs(idev, ifp, 0, 0, false, 2973 jiffies); 2974 ipv6_del_addr(ifp); 2975 addrconf_verify_rtnl(); 2976 if (ipv6_addr_is_multicast(pfx)) { 2977 ipv6_mc_config(net->ipv6.mc_autojoin_sk, 2978 false, pfx, dev->ifindex); 2979 } 2980 return 0; 2981 } 2982 } 2983 read_unlock_bh(&idev->lock); 2984 return -EADDRNOTAVAIL; 2985 } 2986 2987 2988 int addrconf_add_ifaddr(struct net *net, void __user *arg) 2989 { 2990 struct ifa6_config cfg = { 2991 .ifa_flags = IFA_F_PERMANENT, 2992 .preferred_lft = INFINITY_LIFE_TIME, 2993 .valid_lft = INFINITY_LIFE_TIME, 2994 }; 2995 struct in6_ifreq ireq; 2996 int err; 2997 2998 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 2999 return -EPERM; 3000 3001 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 3002 return -EFAULT; 3003 3004 cfg.pfx = &ireq.ifr6_addr; 3005 cfg.plen = ireq.ifr6_prefixlen; 3006 3007 rtnl_lock(); 3008 err = inet6_addr_add(net, ireq.ifr6_ifindex, &cfg, NULL); 3009 rtnl_unlock(); 3010 return err; 3011 } 3012 3013 int addrconf_del_ifaddr(struct net *net, void __user *arg) 3014 { 3015 struct in6_ifreq ireq; 3016 int err; 3017 3018 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 3019 return -EPERM; 3020 3021 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 3022 return -EFAULT; 3023 3024 rtnl_lock(); 3025 err = inet6_addr_del(net, ireq.ifr6_ifindex, 0, &ireq.ifr6_addr, 3026 ireq.ifr6_prefixlen); 3027 rtnl_unlock(); 3028 return err; 3029 } 3030 3031 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr, 3032 int plen, int scope) 3033 { 3034 struct inet6_ifaddr *ifp; 3035 struct ifa6_config cfg = { 3036 .pfx = addr, 3037 .plen = plen, 3038 .ifa_flags = IFA_F_PERMANENT, 3039 .valid_lft = INFINITY_LIFE_TIME, 3040 .preferred_lft = INFINITY_LIFE_TIME, 3041 .scope = scope 3042 }; 3043 3044 ifp = ipv6_add_addr(idev, &cfg, true, NULL); 3045 if (!IS_ERR(ifp)) { 3046 spin_lock_bh(&ifp->lock); 3047 ifp->flags &= ~IFA_F_TENTATIVE; 3048 spin_unlock_bh(&ifp->lock); 3049 rt_genid_bump_ipv6(dev_net(idev->dev)); 3050 ipv6_ifa_notify(RTM_NEWADDR, ifp); 3051 in6_ifa_put(ifp); 3052 } 3053 } 3054 3055 #if IS_ENABLED(CONFIG_IPV6_SIT) 3056 static void sit_add_v4_addrs(struct inet6_dev *idev) 3057 { 3058 struct in6_addr addr; 3059 struct net_device *dev; 3060 struct net *net = dev_net(idev->dev); 3061 int scope, plen; 3062 u32 pflags = 0; 3063 3064 ASSERT_RTNL(); 3065 3066 memset(&addr, 0, sizeof(struct in6_addr)); 3067 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4); 3068 3069 if (idev->dev->flags&IFF_POINTOPOINT) { 3070 addr.s6_addr32[0] = htonl(0xfe800000); 3071 scope = IFA_LINK; 3072 plen = 64; 3073 } else { 3074 scope = IPV6_ADDR_COMPATv4; 3075 plen = 96; 3076 pflags |= RTF_NONEXTHOP; 3077 } 3078 3079 if (addr.s6_addr32[3]) { 3080 add_addr(idev, &addr, plen, scope); 3081 addrconf_prefix_route(&addr, plen, 0, idev->dev, 0, pflags, 3082 GFP_KERNEL); 3083 return; 3084 } 3085 3086 for_each_netdev(net, dev) { 3087 struct in_device *in_dev = __in_dev_get_rtnl(dev); 3088 if (in_dev && (dev->flags & IFF_UP)) { 3089 struct in_ifaddr *ifa; 3090 3091 int flag = scope; 3092 3093 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) { 3094 3095 addr.s6_addr32[3] = ifa->ifa_local; 3096 3097 if (ifa->ifa_scope == RT_SCOPE_LINK) 3098 continue; 3099 if (ifa->ifa_scope >= RT_SCOPE_HOST) { 3100 if (idev->dev->flags&IFF_POINTOPOINT) 3101 continue; 3102 flag |= IFA_HOST; 3103 } 3104 3105 add_addr(idev, &addr, plen, flag); 3106 addrconf_prefix_route(&addr, plen, 0, idev->dev, 3107 0, pflags, GFP_KERNEL); 3108 } 3109 } 3110 } 3111 } 3112 #endif 3113 3114 static void init_loopback(struct net_device *dev) 3115 { 3116 struct inet6_dev *idev; 3117 3118 /* ::1 */ 3119 3120 ASSERT_RTNL(); 3121 3122 idev = ipv6_find_idev(dev); 3123 if (!idev) { 3124 pr_debug("%s: add_dev failed\n", __func__); 3125 return; 3126 } 3127 3128 add_addr(idev, &in6addr_loopback, 128, IFA_HOST); 3129 } 3130 3131 void addrconf_add_linklocal(struct inet6_dev *idev, 3132 const struct in6_addr *addr, u32 flags) 3133 { 3134 struct ifa6_config cfg = { 3135 .pfx = addr, 3136 .plen = 64, 3137 .ifa_flags = flags | IFA_F_PERMANENT, 3138 .valid_lft = INFINITY_LIFE_TIME, 3139 .preferred_lft = INFINITY_LIFE_TIME, 3140 .scope = IFA_LINK 3141 }; 3142 struct inet6_ifaddr *ifp; 3143 3144 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 3145 if ((dev_net(idev->dev)->ipv6.devconf_all->optimistic_dad || 3146 idev->cnf.optimistic_dad) && 3147 !dev_net(idev->dev)->ipv6.devconf_all->forwarding) 3148 cfg.ifa_flags |= IFA_F_OPTIMISTIC; 3149 #endif 3150 3151 ifp = ipv6_add_addr(idev, &cfg, true, NULL); 3152 if (!IS_ERR(ifp)) { 3153 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, 0, idev->dev, 3154 0, 0, GFP_ATOMIC); 3155 addrconf_dad_start(ifp); 3156 in6_ifa_put(ifp); 3157 } 3158 } 3159 EXPORT_SYMBOL_GPL(addrconf_add_linklocal); 3160 3161 static bool ipv6_reserved_interfaceid(struct in6_addr address) 3162 { 3163 if ((address.s6_addr32[2] | address.s6_addr32[3]) == 0) 3164 return true; 3165 3166 if (address.s6_addr32[2] == htonl(0x02005eff) && 3167 ((address.s6_addr32[3] & htonl(0xfe000000)) == htonl(0xfe000000))) 3168 return true; 3169 3170 if (address.s6_addr32[2] == htonl(0xfdffffff) && 3171 ((address.s6_addr32[3] & htonl(0xffffff80)) == htonl(0xffffff80))) 3172 return true; 3173 3174 return false; 3175 } 3176 3177 static int ipv6_generate_stable_address(struct in6_addr *address, 3178 u8 dad_count, 3179 const struct inet6_dev *idev) 3180 { 3181 static DEFINE_SPINLOCK(lock); 3182 static __u32 digest[SHA_DIGEST_WORDS]; 3183 static __u32 workspace[SHA_WORKSPACE_WORDS]; 3184 3185 static union { 3186 char __data[SHA_MESSAGE_BYTES]; 3187 struct { 3188 struct in6_addr secret; 3189 __be32 prefix[2]; 3190 unsigned char hwaddr[MAX_ADDR_LEN]; 3191 u8 dad_count; 3192 } __packed; 3193 } data; 3194 3195 struct in6_addr secret; 3196 struct in6_addr temp; 3197 struct net *net = dev_net(idev->dev); 3198 3199 BUILD_BUG_ON(sizeof(data.__data) != sizeof(data)); 3200 3201 if (idev->cnf.stable_secret.initialized) 3202 secret = idev->cnf.stable_secret.secret; 3203 else if (net->ipv6.devconf_dflt->stable_secret.initialized) 3204 secret = net->ipv6.devconf_dflt->stable_secret.secret; 3205 else 3206 return -1; 3207 3208 retry: 3209 spin_lock_bh(&lock); 3210 3211 sha_init(digest); 3212 memset(&data, 0, sizeof(data)); 3213 memset(workspace, 0, sizeof(workspace)); 3214 memcpy(data.hwaddr, idev->dev->perm_addr, idev->dev->addr_len); 3215 data.prefix[0] = address->s6_addr32[0]; 3216 data.prefix[1] = address->s6_addr32[1]; 3217 data.secret = secret; 3218 data.dad_count = dad_count; 3219 3220 sha_transform(digest, data.__data, workspace); 3221 3222 temp = *address; 3223 temp.s6_addr32[2] = (__force __be32)digest[0]; 3224 temp.s6_addr32[3] = (__force __be32)digest[1]; 3225 3226 spin_unlock_bh(&lock); 3227 3228 if (ipv6_reserved_interfaceid(temp)) { 3229 dad_count++; 3230 if (dad_count > dev_net(idev->dev)->ipv6.sysctl.idgen_retries) 3231 return -1; 3232 goto retry; 3233 } 3234 3235 *address = temp; 3236 return 0; 3237 } 3238 3239 static void ipv6_gen_mode_random_init(struct inet6_dev *idev) 3240 { 3241 struct ipv6_stable_secret *s = &idev->cnf.stable_secret; 3242 3243 if (s->initialized) 3244 return; 3245 s = &idev->cnf.stable_secret; 3246 get_random_bytes(&s->secret, sizeof(s->secret)); 3247 s->initialized = true; 3248 } 3249 3250 static void addrconf_addr_gen(struct inet6_dev *idev, bool prefix_route) 3251 { 3252 struct in6_addr addr; 3253 3254 /* no link local addresses on L3 master devices */ 3255 if (netif_is_l3_master(idev->dev)) 3256 return; 3257 3258 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0); 3259 3260 switch (idev->cnf.addr_gen_mode) { 3261 case IN6_ADDR_GEN_MODE_RANDOM: 3262 ipv6_gen_mode_random_init(idev); 3263 /* fallthrough */ 3264 case IN6_ADDR_GEN_MODE_STABLE_PRIVACY: 3265 if (!ipv6_generate_stable_address(&addr, 0, idev)) 3266 addrconf_add_linklocal(idev, &addr, 3267 IFA_F_STABLE_PRIVACY); 3268 else if (prefix_route) 3269 addrconf_prefix_route(&addr, 64, 0, idev->dev, 3270 0, 0, GFP_KERNEL); 3271 break; 3272 case IN6_ADDR_GEN_MODE_EUI64: 3273 /* addrconf_add_linklocal also adds a prefix_route and we 3274 * only need to care about prefix routes if ipv6_generate_eui64 3275 * couldn't generate one. 3276 */ 3277 if (ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) == 0) 3278 addrconf_add_linklocal(idev, &addr, 0); 3279 else if (prefix_route) 3280 addrconf_prefix_route(&addr, 64, 0, idev->dev, 3281 0, 0, GFP_KERNEL); 3282 break; 3283 case IN6_ADDR_GEN_MODE_NONE: 3284 default: 3285 /* will not add any link local address */ 3286 break; 3287 } 3288 } 3289 3290 static void addrconf_dev_config(struct net_device *dev) 3291 { 3292 struct inet6_dev *idev; 3293 3294 ASSERT_RTNL(); 3295 3296 if ((dev->type != ARPHRD_ETHER) && 3297 (dev->type != ARPHRD_FDDI) && 3298 (dev->type != ARPHRD_ARCNET) && 3299 (dev->type != ARPHRD_INFINIBAND) && 3300 (dev->type != ARPHRD_IEEE1394) && 3301 (dev->type != ARPHRD_TUNNEL6) && 3302 (dev->type != ARPHRD_6LOWPAN) && 3303 (dev->type != ARPHRD_IP6GRE) && 3304 (dev->type != ARPHRD_IPGRE) && 3305 (dev->type != ARPHRD_TUNNEL) && 3306 (dev->type != ARPHRD_NONE) && 3307 (dev->type != ARPHRD_RAWIP)) { 3308 /* Alas, we support only Ethernet autoconfiguration. */ 3309 return; 3310 } 3311 3312 idev = addrconf_add_dev(dev); 3313 if (IS_ERR(idev)) 3314 return; 3315 3316 /* this device type has no EUI support */ 3317 if (dev->type == ARPHRD_NONE && 3318 idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_EUI64) 3319 idev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_RANDOM; 3320 3321 addrconf_addr_gen(idev, false); 3322 } 3323 3324 #if IS_ENABLED(CONFIG_IPV6_SIT) 3325 static void addrconf_sit_config(struct net_device *dev) 3326 { 3327 struct inet6_dev *idev; 3328 3329 ASSERT_RTNL(); 3330 3331 /* 3332 * Configure the tunnel with one of our IPv4 3333 * addresses... we should configure all of 3334 * our v4 addrs in the tunnel 3335 */ 3336 3337 idev = ipv6_find_idev(dev); 3338 if (!idev) { 3339 pr_debug("%s: add_dev failed\n", __func__); 3340 return; 3341 } 3342 3343 if (dev->priv_flags & IFF_ISATAP) { 3344 addrconf_addr_gen(idev, false); 3345 return; 3346 } 3347 3348 sit_add_v4_addrs(idev); 3349 3350 if (dev->flags&IFF_POINTOPOINT) 3351 addrconf_add_mroute(dev); 3352 } 3353 #endif 3354 3355 #if IS_ENABLED(CONFIG_NET_IPGRE) 3356 static void addrconf_gre_config(struct net_device *dev) 3357 { 3358 struct inet6_dev *idev; 3359 3360 ASSERT_RTNL(); 3361 3362 idev = ipv6_find_idev(dev); 3363 if (!idev) { 3364 pr_debug("%s: add_dev failed\n", __func__); 3365 return; 3366 } 3367 3368 addrconf_addr_gen(idev, true); 3369 if (dev->flags & IFF_POINTOPOINT) 3370 addrconf_add_mroute(dev); 3371 } 3372 #endif 3373 3374 static int fixup_permanent_addr(struct net *net, 3375 struct inet6_dev *idev, 3376 struct inet6_ifaddr *ifp) 3377 { 3378 /* !fib6_node means the host route was removed from the 3379 * FIB, for example, if 'lo' device is taken down. In that 3380 * case regenerate the host route. 3381 */ 3382 if (!ifp->rt || !ifp->rt->fib6_node) { 3383 struct fib6_info *f6i, *prev; 3384 3385 f6i = addrconf_f6i_alloc(net, idev, &ifp->addr, false, 3386 GFP_ATOMIC); 3387 if (IS_ERR(f6i)) 3388 return PTR_ERR(f6i); 3389 3390 /* ifp->rt can be accessed outside of rtnl */ 3391 spin_lock(&ifp->lock); 3392 prev = ifp->rt; 3393 ifp->rt = f6i; 3394 spin_unlock(&ifp->lock); 3395 3396 fib6_info_release(prev); 3397 } 3398 3399 if (!(ifp->flags & IFA_F_NOPREFIXROUTE)) { 3400 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, 3401 ifp->rt_priority, idev->dev, 0, 0, 3402 GFP_ATOMIC); 3403 } 3404 3405 if (ifp->state == INET6_IFADDR_STATE_PREDAD) 3406 addrconf_dad_start(ifp); 3407 3408 return 0; 3409 } 3410 3411 static void addrconf_permanent_addr(struct net *net, struct net_device *dev) 3412 { 3413 struct inet6_ifaddr *ifp, *tmp; 3414 struct inet6_dev *idev; 3415 3416 idev = __in6_dev_get(dev); 3417 if (!idev) 3418 return; 3419 3420 write_lock_bh(&idev->lock); 3421 3422 list_for_each_entry_safe(ifp, tmp, &idev->addr_list, if_list) { 3423 if ((ifp->flags & IFA_F_PERMANENT) && 3424 fixup_permanent_addr(net, idev, ifp) < 0) { 3425 write_unlock_bh(&idev->lock); 3426 in6_ifa_hold(ifp); 3427 ipv6_del_addr(ifp); 3428 write_lock_bh(&idev->lock); 3429 3430 net_info_ratelimited("%s: Failed to add prefix route for address %pI6c; dropping\n", 3431 idev->dev->name, &ifp->addr); 3432 } 3433 } 3434 3435 write_unlock_bh(&idev->lock); 3436 } 3437 3438 static int addrconf_notify(struct notifier_block *this, unsigned long event, 3439 void *ptr) 3440 { 3441 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 3442 struct netdev_notifier_change_info *change_info; 3443 struct netdev_notifier_changeupper_info *info; 3444 struct inet6_dev *idev = __in6_dev_get(dev); 3445 struct net *net = dev_net(dev); 3446 int run_pending = 0; 3447 int err; 3448 3449 switch (event) { 3450 case NETDEV_REGISTER: 3451 if (!idev && dev->mtu >= IPV6_MIN_MTU) { 3452 idev = ipv6_add_dev(dev); 3453 if (IS_ERR(idev)) 3454 return notifier_from_errno(PTR_ERR(idev)); 3455 } 3456 break; 3457 3458 case NETDEV_CHANGEMTU: 3459 /* if MTU under IPV6_MIN_MTU stop IPv6 on this interface. */ 3460 if (dev->mtu < IPV6_MIN_MTU) { 3461 addrconf_ifdown(dev, dev != net->loopback_dev); 3462 break; 3463 } 3464 3465 if (idev) { 3466 rt6_mtu_change(dev, dev->mtu); 3467 idev->cnf.mtu6 = dev->mtu; 3468 break; 3469 } 3470 3471 /* allocate new idev */ 3472 idev = ipv6_add_dev(dev); 3473 if (IS_ERR(idev)) 3474 break; 3475 3476 /* device is still not ready */ 3477 if (!(idev->if_flags & IF_READY)) 3478 break; 3479 3480 run_pending = 1; 3481 3482 /* fall through */ 3483 3484 case NETDEV_UP: 3485 case NETDEV_CHANGE: 3486 if (dev->flags & IFF_SLAVE) 3487 break; 3488 3489 if (idev && idev->cnf.disable_ipv6) 3490 break; 3491 3492 if (event == NETDEV_UP) { 3493 /* restore routes for permanent addresses */ 3494 addrconf_permanent_addr(net, dev); 3495 3496 if (!addrconf_link_ready(dev)) { 3497 /* device is not ready yet. */ 3498 pr_debug("ADDRCONF(NETDEV_UP): %s: link is not ready\n", 3499 dev->name); 3500 break; 3501 } 3502 3503 if (!idev && dev->mtu >= IPV6_MIN_MTU) 3504 idev = ipv6_add_dev(dev); 3505 3506 if (!IS_ERR_OR_NULL(idev)) { 3507 idev->if_flags |= IF_READY; 3508 run_pending = 1; 3509 } 3510 } else if (event == NETDEV_CHANGE) { 3511 if (!addrconf_link_ready(dev)) { 3512 /* device is still not ready. */ 3513 rt6_sync_down_dev(dev, event); 3514 break; 3515 } 3516 3517 if (!IS_ERR_OR_NULL(idev)) { 3518 if (idev->if_flags & IF_READY) { 3519 /* device is already configured - 3520 * but resend MLD reports, we might 3521 * have roamed and need to update 3522 * multicast snooping switches 3523 */ 3524 ipv6_mc_up(idev); 3525 change_info = ptr; 3526 if (change_info->flags_changed & IFF_NOARP) 3527 addrconf_dad_run(idev, true); 3528 rt6_sync_up(dev, RTNH_F_LINKDOWN); 3529 break; 3530 } 3531 idev->if_flags |= IF_READY; 3532 } 3533 3534 pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n", 3535 dev->name); 3536 3537 run_pending = 1; 3538 } 3539 3540 switch (dev->type) { 3541 #if IS_ENABLED(CONFIG_IPV6_SIT) 3542 case ARPHRD_SIT: 3543 addrconf_sit_config(dev); 3544 break; 3545 #endif 3546 #if IS_ENABLED(CONFIG_NET_IPGRE) 3547 case ARPHRD_IPGRE: 3548 addrconf_gre_config(dev); 3549 break; 3550 #endif 3551 case ARPHRD_LOOPBACK: 3552 init_loopback(dev); 3553 break; 3554 3555 default: 3556 addrconf_dev_config(dev); 3557 break; 3558 } 3559 3560 if (!IS_ERR_OR_NULL(idev)) { 3561 if (run_pending) 3562 addrconf_dad_run(idev, false); 3563 3564 /* Device has an address by now */ 3565 rt6_sync_up(dev, RTNH_F_DEAD); 3566 3567 /* 3568 * If the MTU changed during the interface down, 3569 * when the interface up, the changed MTU must be 3570 * reflected in the idev as well as routers. 3571 */ 3572 if (idev->cnf.mtu6 != dev->mtu && 3573 dev->mtu >= IPV6_MIN_MTU) { 3574 rt6_mtu_change(dev, dev->mtu); 3575 idev->cnf.mtu6 = dev->mtu; 3576 } 3577 idev->tstamp = jiffies; 3578 inet6_ifinfo_notify(RTM_NEWLINK, idev); 3579 3580 /* 3581 * If the changed mtu during down is lower than 3582 * IPV6_MIN_MTU stop IPv6 on this interface. 3583 */ 3584 if (dev->mtu < IPV6_MIN_MTU) 3585 addrconf_ifdown(dev, dev != net->loopback_dev); 3586 } 3587 break; 3588 3589 case NETDEV_DOWN: 3590 case NETDEV_UNREGISTER: 3591 /* 3592 * Remove all addresses from this interface. 3593 */ 3594 addrconf_ifdown(dev, event != NETDEV_DOWN); 3595 break; 3596 3597 case NETDEV_CHANGENAME: 3598 if (idev) { 3599 snmp6_unregister_dev(idev); 3600 addrconf_sysctl_unregister(idev); 3601 err = addrconf_sysctl_register(idev); 3602 if (err) 3603 return notifier_from_errno(err); 3604 err = snmp6_register_dev(idev); 3605 if (err) { 3606 addrconf_sysctl_unregister(idev); 3607 return notifier_from_errno(err); 3608 } 3609 } 3610 break; 3611 3612 case NETDEV_PRE_TYPE_CHANGE: 3613 case NETDEV_POST_TYPE_CHANGE: 3614 if (idev) 3615 addrconf_type_change(dev, event); 3616 break; 3617 3618 case NETDEV_CHANGEUPPER: 3619 info = ptr; 3620 3621 /* flush all routes if dev is linked to or unlinked from 3622 * an L3 master device (e.g., VRF) 3623 */ 3624 if (info->upper_dev && netif_is_l3_master(info->upper_dev)) 3625 addrconf_ifdown(dev, 0); 3626 } 3627 3628 return NOTIFY_OK; 3629 } 3630 3631 /* 3632 * addrconf module should be notified of a device going up 3633 */ 3634 static struct notifier_block ipv6_dev_notf = { 3635 .notifier_call = addrconf_notify, 3636 .priority = ADDRCONF_NOTIFY_PRIORITY, 3637 }; 3638 3639 static void addrconf_type_change(struct net_device *dev, unsigned long event) 3640 { 3641 struct inet6_dev *idev; 3642 ASSERT_RTNL(); 3643 3644 idev = __in6_dev_get(dev); 3645 3646 if (event == NETDEV_POST_TYPE_CHANGE) 3647 ipv6_mc_remap(idev); 3648 else if (event == NETDEV_PRE_TYPE_CHANGE) 3649 ipv6_mc_unmap(idev); 3650 } 3651 3652 static bool addr_is_local(const struct in6_addr *addr) 3653 { 3654 return ipv6_addr_type(addr) & 3655 (IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK); 3656 } 3657 3658 static int addrconf_ifdown(struct net_device *dev, int how) 3659 { 3660 unsigned long event = how ? NETDEV_UNREGISTER : NETDEV_DOWN; 3661 struct net *net = dev_net(dev); 3662 struct inet6_dev *idev; 3663 struct inet6_ifaddr *ifa, *tmp; 3664 bool keep_addr = false; 3665 int state, i; 3666 3667 ASSERT_RTNL(); 3668 3669 rt6_disable_ip(dev, event); 3670 3671 idev = __in6_dev_get(dev); 3672 if (!idev) 3673 return -ENODEV; 3674 3675 /* 3676 * Step 1: remove reference to ipv6 device from parent device. 3677 * Do not dev_put! 3678 */ 3679 if (how) { 3680 idev->dead = 1; 3681 3682 /* protected by rtnl_lock */ 3683 RCU_INIT_POINTER(dev->ip6_ptr, NULL); 3684 3685 /* Step 1.5: remove snmp6 entry */ 3686 snmp6_unregister_dev(idev); 3687 3688 } 3689 3690 /* combine the user config with event to determine if permanent 3691 * addresses are to be removed from address hash table 3692 */ 3693 if (!how && !idev->cnf.disable_ipv6) { 3694 /* aggregate the system setting and interface setting */ 3695 int _keep_addr = net->ipv6.devconf_all->keep_addr_on_down; 3696 3697 if (!_keep_addr) 3698 _keep_addr = idev->cnf.keep_addr_on_down; 3699 3700 keep_addr = (_keep_addr > 0); 3701 } 3702 3703 /* Step 2: clear hash table */ 3704 for (i = 0; i < IN6_ADDR_HSIZE; i++) { 3705 struct hlist_head *h = &inet6_addr_lst[i]; 3706 3707 spin_lock_bh(&addrconf_hash_lock); 3708 restart: 3709 hlist_for_each_entry_rcu(ifa, h, addr_lst) { 3710 if (ifa->idev == idev) { 3711 addrconf_del_dad_work(ifa); 3712 /* combined flag + permanent flag decide if 3713 * address is retained on a down event 3714 */ 3715 if (!keep_addr || 3716 !(ifa->flags & IFA_F_PERMANENT) || 3717 addr_is_local(&ifa->addr)) { 3718 hlist_del_init_rcu(&ifa->addr_lst); 3719 goto restart; 3720 } 3721 } 3722 } 3723 spin_unlock_bh(&addrconf_hash_lock); 3724 } 3725 3726 write_lock_bh(&idev->lock); 3727 3728 addrconf_del_rs_timer(idev); 3729 3730 /* Step 2: clear flags for stateless addrconf */ 3731 if (!how) 3732 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY); 3733 3734 /* Step 3: clear tempaddr list */ 3735 while (!list_empty(&idev->tempaddr_list)) { 3736 ifa = list_first_entry(&idev->tempaddr_list, 3737 struct inet6_ifaddr, tmp_list); 3738 list_del(&ifa->tmp_list); 3739 write_unlock_bh(&idev->lock); 3740 spin_lock_bh(&ifa->lock); 3741 3742 if (ifa->ifpub) { 3743 in6_ifa_put(ifa->ifpub); 3744 ifa->ifpub = NULL; 3745 } 3746 spin_unlock_bh(&ifa->lock); 3747 in6_ifa_put(ifa); 3748 write_lock_bh(&idev->lock); 3749 } 3750 3751 list_for_each_entry_safe(ifa, tmp, &idev->addr_list, if_list) { 3752 struct fib6_info *rt = NULL; 3753 bool keep; 3754 3755 addrconf_del_dad_work(ifa); 3756 3757 keep = keep_addr && (ifa->flags & IFA_F_PERMANENT) && 3758 !addr_is_local(&ifa->addr); 3759 3760 write_unlock_bh(&idev->lock); 3761 spin_lock_bh(&ifa->lock); 3762 3763 if (keep) { 3764 /* set state to skip the notifier below */ 3765 state = INET6_IFADDR_STATE_DEAD; 3766 ifa->state = INET6_IFADDR_STATE_PREDAD; 3767 if (!(ifa->flags & IFA_F_NODAD)) 3768 ifa->flags |= IFA_F_TENTATIVE; 3769 3770 rt = ifa->rt; 3771 ifa->rt = NULL; 3772 } else { 3773 state = ifa->state; 3774 ifa->state = INET6_IFADDR_STATE_DEAD; 3775 } 3776 3777 spin_unlock_bh(&ifa->lock); 3778 3779 if (rt) 3780 ip6_del_rt(net, rt); 3781 3782 if (state != INET6_IFADDR_STATE_DEAD) { 3783 __ipv6_ifa_notify(RTM_DELADDR, ifa); 3784 inet6addr_notifier_call_chain(NETDEV_DOWN, ifa); 3785 } else { 3786 if (idev->cnf.forwarding) 3787 addrconf_leave_anycast(ifa); 3788 addrconf_leave_solict(ifa->idev, &ifa->addr); 3789 } 3790 3791 write_lock_bh(&idev->lock); 3792 if (!keep) { 3793 list_del_rcu(&ifa->if_list); 3794 in6_ifa_put(ifa); 3795 } 3796 } 3797 3798 write_unlock_bh(&idev->lock); 3799 3800 /* Step 5: Discard anycast and multicast list */ 3801 if (how) { 3802 ipv6_ac_destroy_dev(idev); 3803 ipv6_mc_destroy_dev(idev); 3804 } else { 3805 ipv6_mc_down(idev); 3806 } 3807 3808 idev->tstamp = jiffies; 3809 3810 /* Last: Shot the device (if unregistered) */ 3811 if (how) { 3812 addrconf_sysctl_unregister(idev); 3813 neigh_parms_release(&nd_tbl, idev->nd_parms); 3814 neigh_ifdown(&nd_tbl, dev); 3815 in6_dev_put(idev); 3816 } 3817 return 0; 3818 } 3819 3820 static void addrconf_rs_timer(struct timer_list *t) 3821 { 3822 struct inet6_dev *idev = from_timer(idev, t, rs_timer); 3823 struct net_device *dev = idev->dev; 3824 struct in6_addr lladdr; 3825 3826 write_lock(&idev->lock); 3827 if (idev->dead || !(idev->if_flags & IF_READY)) 3828 goto out; 3829 3830 if (!ipv6_accept_ra(idev)) 3831 goto out; 3832 3833 /* Announcement received after solicitation was sent */ 3834 if (idev->if_flags & IF_RA_RCVD) 3835 goto out; 3836 3837 if (idev->rs_probes++ < idev->cnf.rtr_solicits || idev->cnf.rtr_solicits < 0) { 3838 write_unlock(&idev->lock); 3839 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE)) 3840 ndisc_send_rs(dev, &lladdr, 3841 &in6addr_linklocal_allrouters); 3842 else 3843 goto put; 3844 3845 write_lock(&idev->lock); 3846 idev->rs_interval = rfc3315_s14_backoff_update( 3847 idev->rs_interval, idev->cnf.rtr_solicit_max_interval); 3848 /* The wait after the last probe can be shorter */ 3849 addrconf_mod_rs_timer(idev, (idev->rs_probes == 3850 idev->cnf.rtr_solicits) ? 3851 idev->cnf.rtr_solicit_delay : 3852 idev->rs_interval); 3853 } else { 3854 /* 3855 * Note: we do not support deprecated "all on-link" 3856 * assumption any longer. 3857 */ 3858 pr_debug("%s: no IPv6 routers present\n", idev->dev->name); 3859 } 3860 3861 out: 3862 write_unlock(&idev->lock); 3863 put: 3864 in6_dev_put(idev); 3865 } 3866 3867 /* 3868 * Duplicate Address Detection 3869 */ 3870 static void addrconf_dad_kick(struct inet6_ifaddr *ifp) 3871 { 3872 unsigned long rand_num; 3873 struct inet6_dev *idev = ifp->idev; 3874 u64 nonce; 3875 3876 if (ifp->flags & IFA_F_OPTIMISTIC) 3877 rand_num = 0; 3878 else 3879 rand_num = prandom_u32() % (idev->cnf.rtr_solicit_delay ? : 1); 3880 3881 nonce = 0; 3882 if (idev->cnf.enhanced_dad || 3883 dev_net(idev->dev)->ipv6.devconf_all->enhanced_dad) { 3884 do 3885 get_random_bytes(&nonce, 6); 3886 while (nonce == 0); 3887 } 3888 ifp->dad_nonce = nonce; 3889 ifp->dad_probes = idev->cnf.dad_transmits; 3890 addrconf_mod_dad_work(ifp, rand_num); 3891 } 3892 3893 static void addrconf_dad_begin(struct inet6_ifaddr *ifp) 3894 { 3895 struct inet6_dev *idev = ifp->idev; 3896 struct net_device *dev = idev->dev; 3897 bool bump_id, notify = false; 3898 struct net *net; 3899 3900 addrconf_join_solict(dev, &ifp->addr); 3901 3902 prandom_seed((__force u32) ifp->addr.s6_addr32[3]); 3903 3904 read_lock_bh(&idev->lock); 3905 spin_lock(&ifp->lock); 3906 if (ifp->state == INET6_IFADDR_STATE_DEAD) 3907 goto out; 3908 3909 net = dev_net(dev); 3910 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) || 3911 (net->ipv6.devconf_all->accept_dad < 1 && 3912 idev->cnf.accept_dad < 1) || 3913 !(ifp->flags&IFA_F_TENTATIVE) || 3914 ifp->flags & IFA_F_NODAD) { 3915 bool send_na = false; 3916 3917 if (ifp->flags & IFA_F_TENTATIVE && 3918 !(ifp->flags & IFA_F_OPTIMISTIC)) 3919 send_na = true; 3920 bump_id = ifp->flags & IFA_F_TENTATIVE; 3921 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED); 3922 spin_unlock(&ifp->lock); 3923 read_unlock_bh(&idev->lock); 3924 3925 addrconf_dad_completed(ifp, bump_id, send_na); 3926 return; 3927 } 3928 3929 if (!(idev->if_flags & IF_READY)) { 3930 spin_unlock(&ifp->lock); 3931 read_unlock_bh(&idev->lock); 3932 /* 3933 * If the device is not ready: 3934 * - keep it tentative if it is a permanent address. 3935 * - otherwise, kill it. 3936 */ 3937 in6_ifa_hold(ifp); 3938 addrconf_dad_stop(ifp, 0); 3939 return; 3940 } 3941 3942 /* 3943 * Optimistic nodes can start receiving 3944 * Frames right away 3945 */ 3946 if (ifp->flags & IFA_F_OPTIMISTIC) { 3947 ip6_ins_rt(net, ifp->rt); 3948 if (ipv6_use_optimistic_addr(net, idev)) { 3949 /* Because optimistic nodes can use this address, 3950 * notify listeners. If DAD fails, RTM_DELADDR is sent. 3951 */ 3952 notify = true; 3953 } 3954 } 3955 3956 addrconf_dad_kick(ifp); 3957 out: 3958 spin_unlock(&ifp->lock); 3959 read_unlock_bh(&idev->lock); 3960 if (notify) 3961 ipv6_ifa_notify(RTM_NEWADDR, ifp); 3962 } 3963 3964 static void addrconf_dad_start(struct inet6_ifaddr *ifp) 3965 { 3966 bool begin_dad = false; 3967 3968 spin_lock_bh(&ifp->lock); 3969 if (ifp->state != INET6_IFADDR_STATE_DEAD) { 3970 ifp->state = INET6_IFADDR_STATE_PREDAD; 3971 begin_dad = true; 3972 } 3973 spin_unlock_bh(&ifp->lock); 3974 3975 if (begin_dad) 3976 addrconf_mod_dad_work(ifp, 0); 3977 } 3978 3979 static void addrconf_dad_work(struct work_struct *w) 3980 { 3981 struct inet6_ifaddr *ifp = container_of(to_delayed_work(w), 3982 struct inet6_ifaddr, 3983 dad_work); 3984 struct inet6_dev *idev = ifp->idev; 3985 bool bump_id, disable_ipv6 = false; 3986 struct in6_addr mcaddr; 3987 3988 enum { 3989 DAD_PROCESS, 3990 DAD_BEGIN, 3991 DAD_ABORT, 3992 } action = DAD_PROCESS; 3993 3994 rtnl_lock(); 3995 3996 spin_lock_bh(&ifp->lock); 3997 if (ifp->state == INET6_IFADDR_STATE_PREDAD) { 3998 action = DAD_BEGIN; 3999 ifp->state = INET6_IFADDR_STATE_DAD; 4000 } else if (ifp->state == INET6_IFADDR_STATE_ERRDAD) { 4001 action = DAD_ABORT; 4002 ifp->state = INET6_IFADDR_STATE_POSTDAD; 4003 4004 if ((dev_net(idev->dev)->ipv6.devconf_all->accept_dad > 1 || 4005 idev->cnf.accept_dad > 1) && 4006 !idev->cnf.disable_ipv6 && 4007 !(ifp->flags & IFA_F_STABLE_PRIVACY)) { 4008 struct in6_addr addr; 4009 4010 addr.s6_addr32[0] = htonl(0xfe800000); 4011 addr.s6_addr32[1] = 0; 4012 4013 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) && 4014 ipv6_addr_equal(&ifp->addr, &addr)) { 4015 /* DAD failed for link-local based on MAC */ 4016 idev->cnf.disable_ipv6 = 1; 4017 4018 pr_info("%s: IPv6 being disabled!\n", 4019 ifp->idev->dev->name); 4020 disable_ipv6 = true; 4021 } 4022 } 4023 } 4024 spin_unlock_bh(&ifp->lock); 4025 4026 if (action == DAD_BEGIN) { 4027 addrconf_dad_begin(ifp); 4028 goto out; 4029 } else if (action == DAD_ABORT) { 4030 in6_ifa_hold(ifp); 4031 addrconf_dad_stop(ifp, 1); 4032 if (disable_ipv6) 4033 addrconf_ifdown(idev->dev, 0); 4034 goto out; 4035 } 4036 4037 if (!ifp->dad_probes && addrconf_dad_end(ifp)) 4038 goto out; 4039 4040 write_lock_bh(&idev->lock); 4041 if (idev->dead || !(idev->if_flags & IF_READY)) { 4042 write_unlock_bh(&idev->lock); 4043 goto out; 4044 } 4045 4046 spin_lock(&ifp->lock); 4047 if (ifp->state == INET6_IFADDR_STATE_DEAD) { 4048 spin_unlock(&ifp->lock); 4049 write_unlock_bh(&idev->lock); 4050 goto out; 4051 } 4052 4053 if (ifp->dad_probes == 0) { 4054 bool send_na = false; 4055 4056 /* 4057 * DAD was successful 4058 */ 4059 4060 if (ifp->flags & IFA_F_TENTATIVE && 4061 !(ifp->flags & IFA_F_OPTIMISTIC)) 4062 send_na = true; 4063 bump_id = ifp->flags & IFA_F_TENTATIVE; 4064 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED); 4065 spin_unlock(&ifp->lock); 4066 write_unlock_bh(&idev->lock); 4067 4068 addrconf_dad_completed(ifp, bump_id, send_na); 4069 4070 goto out; 4071 } 4072 4073 ifp->dad_probes--; 4074 addrconf_mod_dad_work(ifp, 4075 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME)); 4076 spin_unlock(&ifp->lock); 4077 write_unlock_bh(&idev->lock); 4078 4079 /* send a neighbour solicitation for our addr */ 4080 addrconf_addr_solict_mult(&ifp->addr, &mcaddr); 4081 ndisc_send_ns(ifp->idev->dev, &ifp->addr, &mcaddr, &in6addr_any, 4082 ifp->dad_nonce); 4083 out: 4084 in6_ifa_put(ifp); 4085 rtnl_unlock(); 4086 } 4087 4088 /* ifp->idev must be at least read locked */ 4089 static bool ipv6_lonely_lladdr(struct inet6_ifaddr *ifp) 4090 { 4091 struct inet6_ifaddr *ifpiter; 4092 struct inet6_dev *idev = ifp->idev; 4093 4094 list_for_each_entry_reverse(ifpiter, &idev->addr_list, if_list) { 4095 if (ifpiter->scope > IFA_LINK) 4096 break; 4097 if (ifp != ifpiter && ifpiter->scope == IFA_LINK && 4098 (ifpiter->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE| 4099 IFA_F_OPTIMISTIC|IFA_F_DADFAILED)) == 4100 IFA_F_PERMANENT) 4101 return false; 4102 } 4103 return true; 4104 } 4105 4106 static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id, 4107 bool send_na) 4108 { 4109 struct net_device *dev = ifp->idev->dev; 4110 struct in6_addr lladdr; 4111 bool send_rs, send_mld; 4112 4113 addrconf_del_dad_work(ifp); 4114 4115 /* 4116 * Configure the address for reception. Now it is valid. 4117 */ 4118 4119 ipv6_ifa_notify(RTM_NEWADDR, ifp); 4120 4121 /* If added prefix is link local and we are prepared to process 4122 router advertisements, start sending router solicitations. 4123 */ 4124 4125 read_lock_bh(&ifp->idev->lock); 4126 send_mld = ifp->scope == IFA_LINK && ipv6_lonely_lladdr(ifp); 4127 send_rs = send_mld && 4128 ipv6_accept_ra(ifp->idev) && 4129 ifp->idev->cnf.rtr_solicits != 0 && 4130 (dev->flags&IFF_LOOPBACK) == 0; 4131 read_unlock_bh(&ifp->idev->lock); 4132 4133 /* While dad is in progress mld report's source address is in6_addrany. 4134 * Resend with proper ll now. 4135 */ 4136 if (send_mld) 4137 ipv6_mc_dad_complete(ifp->idev); 4138 4139 /* send unsolicited NA if enabled */ 4140 if (send_na && 4141 (ifp->idev->cnf.ndisc_notify || 4142 dev_net(dev)->ipv6.devconf_all->ndisc_notify)) { 4143 ndisc_send_na(dev, &in6addr_linklocal_allnodes, &ifp->addr, 4144 /*router=*/ !!ifp->idev->cnf.forwarding, 4145 /*solicited=*/ false, /*override=*/ true, 4146 /*inc_opt=*/ true); 4147 } 4148 4149 if (send_rs) { 4150 /* 4151 * If a host as already performed a random delay 4152 * [...] as part of DAD [...] there is no need 4153 * to delay again before sending the first RS 4154 */ 4155 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE)) 4156 return; 4157 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters); 4158 4159 write_lock_bh(&ifp->idev->lock); 4160 spin_lock(&ifp->lock); 4161 ifp->idev->rs_interval = rfc3315_s14_backoff_init( 4162 ifp->idev->cnf.rtr_solicit_interval); 4163 ifp->idev->rs_probes = 1; 4164 ifp->idev->if_flags |= IF_RS_SENT; 4165 addrconf_mod_rs_timer(ifp->idev, ifp->idev->rs_interval); 4166 spin_unlock(&ifp->lock); 4167 write_unlock_bh(&ifp->idev->lock); 4168 } 4169 4170 if (bump_id) 4171 rt_genid_bump_ipv6(dev_net(dev)); 4172 4173 /* Make sure that a new temporary address will be created 4174 * before this temporary address becomes deprecated. 4175 */ 4176 if (ifp->flags & IFA_F_TEMPORARY) 4177 addrconf_verify_rtnl(); 4178 } 4179 4180 static void addrconf_dad_run(struct inet6_dev *idev, bool restart) 4181 { 4182 struct inet6_ifaddr *ifp; 4183 4184 read_lock_bh(&idev->lock); 4185 list_for_each_entry(ifp, &idev->addr_list, if_list) { 4186 spin_lock(&ifp->lock); 4187 if ((ifp->flags & IFA_F_TENTATIVE && 4188 ifp->state == INET6_IFADDR_STATE_DAD) || restart) { 4189 if (restart) 4190 ifp->state = INET6_IFADDR_STATE_PREDAD; 4191 addrconf_dad_kick(ifp); 4192 } 4193 spin_unlock(&ifp->lock); 4194 } 4195 read_unlock_bh(&idev->lock); 4196 } 4197 4198 #ifdef CONFIG_PROC_FS 4199 struct if6_iter_state { 4200 struct seq_net_private p; 4201 int bucket; 4202 int offset; 4203 }; 4204 4205 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos) 4206 { 4207 struct if6_iter_state *state = seq->private; 4208 struct net *net = seq_file_net(seq); 4209 struct inet6_ifaddr *ifa = NULL; 4210 int p = 0; 4211 4212 /* initial bucket if pos is 0 */ 4213 if (pos == 0) { 4214 state->bucket = 0; 4215 state->offset = 0; 4216 } 4217 4218 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) { 4219 hlist_for_each_entry_rcu(ifa, &inet6_addr_lst[state->bucket], 4220 addr_lst) { 4221 if (!net_eq(dev_net(ifa->idev->dev), net)) 4222 continue; 4223 /* sync with offset */ 4224 if (p < state->offset) { 4225 p++; 4226 continue; 4227 } 4228 return ifa; 4229 } 4230 4231 /* prepare for next bucket */ 4232 state->offset = 0; 4233 p = 0; 4234 } 4235 return NULL; 4236 } 4237 4238 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, 4239 struct inet6_ifaddr *ifa) 4240 { 4241 struct if6_iter_state *state = seq->private; 4242 struct net *net = seq_file_net(seq); 4243 4244 hlist_for_each_entry_continue_rcu(ifa, addr_lst) { 4245 if (!net_eq(dev_net(ifa->idev->dev), net)) 4246 continue; 4247 state->offset++; 4248 return ifa; 4249 } 4250 4251 state->offset = 0; 4252 while (++state->bucket < IN6_ADDR_HSIZE) { 4253 hlist_for_each_entry_rcu(ifa, 4254 &inet6_addr_lst[state->bucket], addr_lst) { 4255 if (!net_eq(dev_net(ifa->idev->dev), net)) 4256 continue; 4257 return ifa; 4258 } 4259 } 4260 4261 return NULL; 4262 } 4263 4264 static void *if6_seq_start(struct seq_file *seq, loff_t *pos) 4265 __acquires(rcu) 4266 { 4267 rcu_read_lock(); 4268 return if6_get_first(seq, *pos); 4269 } 4270 4271 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos) 4272 { 4273 struct inet6_ifaddr *ifa; 4274 4275 ifa = if6_get_next(seq, v); 4276 ++*pos; 4277 return ifa; 4278 } 4279 4280 static void if6_seq_stop(struct seq_file *seq, void *v) 4281 __releases(rcu) 4282 { 4283 rcu_read_unlock(); 4284 } 4285 4286 static int if6_seq_show(struct seq_file *seq, void *v) 4287 { 4288 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v; 4289 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n", 4290 &ifp->addr, 4291 ifp->idev->dev->ifindex, 4292 ifp->prefix_len, 4293 ifp->scope, 4294 (u8) ifp->flags, 4295 ifp->idev->dev->name); 4296 return 0; 4297 } 4298 4299 static const struct seq_operations if6_seq_ops = { 4300 .start = if6_seq_start, 4301 .next = if6_seq_next, 4302 .show = if6_seq_show, 4303 .stop = if6_seq_stop, 4304 }; 4305 4306 static int __net_init if6_proc_net_init(struct net *net) 4307 { 4308 if (!proc_create_net("if_inet6", 0444, net->proc_net, &if6_seq_ops, 4309 sizeof(struct if6_iter_state))) 4310 return -ENOMEM; 4311 return 0; 4312 } 4313 4314 static void __net_exit if6_proc_net_exit(struct net *net) 4315 { 4316 remove_proc_entry("if_inet6", net->proc_net); 4317 } 4318 4319 static struct pernet_operations if6_proc_net_ops = { 4320 .init = if6_proc_net_init, 4321 .exit = if6_proc_net_exit, 4322 }; 4323 4324 int __init if6_proc_init(void) 4325 { 4326 return register_pernet_subsys(&if6_proc_net_ops); 4327 } 4328 4329 void if6_proc_exit(void) 4330 { 4331 unregister_pernet_subsys(&if6_proc_net_ops); 4332 } 4333 #endif /* CONFIG_PROC_FS */ 4334 4335 #if IS_ENABLED(CONFIG_IPV6_MIP6) 4336 /* Check if address is a home address configured on any interface. */ 4337 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr) 4338 { 4339 unsigned int hash = inet6_addr_hash(net, addr); 4340 struct inet6_ifaddr *ifp = NULL; 4341 int ret = 0; 4342 4343 rcu_read_lock(); 4344 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) { 4345 if (!net_eq(dev_net(ifp->idev->dev), net)) 4346 continue; 4347 if (ipv6_addr_equal(&ifp->addr, addr) && 4348 (ifp->flags & IFA_F_HOMEADDRESS)) { 4349 ret = 1; 4350 break; 4351 } 4352 } 4353 rcu_read_unlock(); 4354 return ret; 4355 } 4356 #endif 4357 4358 /* 4359 * Periodic address status verification 4360 */ 4361 4362 static void addrconf_verify_rtnl(void) 4363 { 4364 unsigned long now, next, next_sec, next_sched; 4365 struct inet6_ifaddr *ifp; 4366 int i; 4367 4368 ASSERT_RTNL(); 4369 4370 rcu_read_lock_bh(); 4371 now = jiffies; 4372 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY); 4373 4374 cancel_delayed_work(&addr_chk_work); 4375 4376 for (i = 0; i < IN6_ADDR_HSIZE; i++) { 4377 restart: 4378 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[i], addr_lst) { 4379 unsigned long age; 4380 4381 /* When setting preferred_lft to a value not zero or 4382 * infinity, while valid_lft is infinity 4383 * IFA_F_PERMANENT has a non-infinity life time. 4384 */ 4385 if ((ifp->flags & IFA_F_PERMANENT) && 4386 (ifp->prefered_lft == INFINITY_LIFE_TIME)) 4387 continue; 4388 4389 spin_lock(&ifp->lock); 4390 /* We try to batch several events at once. */ 4391 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ; 4392 4393 if (ifp->valid_lft != INFINITY_LIFE_TIME && 4394 age >= ifp->valid_lft) { 4395 spin_unlock(&ifp->lock); 4396 in6_ifa_hold(ifp); 4397 ipv6_del_addr(ifp); 4398 goto restart; 4399 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) { 4400 spin_unlock(&ifp->lock); 4401 continue; 4402 } else if (age >= ifp->prefered_lft) { 4403 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */ 4404 int deprecate = 0; 4405 4406 if (!(ifp->flags&IFA_F_DEPRECATED)) { 4407 deprecate = 1; 4408 ifp->flags |= IFA_F_DEPRECATED; 4409 } 4410 4411 if ((ifp->valid_lft != INFINITY_LIFE_TIME) && 4412 (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))) 4413 next = ifp->tstamp + ifp->valid_lft * HZ; 4414 4415 spin_unlock(&ifp->lock); 4416 4417 if (deprecate) { 4418 in6_ifa_hold(ifp); 4419 4420 ipv6_ifa_notify(0, ifp); 4421 in6_ifa_put(ifp); 4422 goto restart; 4423 } 4424 } else if ((ifp->flags&IFA_F_TEMPORARY) && 4425 !(ifp->flags&IFA_F_TENTATIVE)) { 4426 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry * 4427 ifp->idev->cnf.dad_transmits * 4428 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME) / HZ; 4429 4430 if (age >= ifp->prefered_lft - regen_advance) { 4431 struct inet6_ifaddr *ifpub = ifp->ifpub; 4432 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 4433 next = ifp->tstamp + ifp->prefered_lft * HZ; 4434 if (!ifp->regen_count && ifpub) { 4435 ifp->regen_count++; 4436 in6_ifa_hold(ifp); 4437 in6_ifa_hold(ifpub); 4438 spin_unlock(&ifp->lock); 4439 4440 spin_lock(&ifpub->lock); 4441 ifpub->regen_count = 0; 4442 spin_unlock(&ifpub->lock); 4443 rcu_read_unlock_bh(); 4444 ipv6_create_tempaddr(ifpub, ifp, true); 4445 in6_ifa_put(ifpub); 4446 in6_ifa_put(ifp); 4447 rcu_read_lock_bh(); 4448 goto restart; 4449 } 4450 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next)) 4451 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ; 4452 spin_unlock(&ifp->lock); 4453 } else { 4454 /* ifp->prefered_lft <= ifp->valid_lft */ 4455 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 4456 next = ifp->tstamp + ifp->prefered_lft * HZ; 4457 spin_unlock(&ifp->lock); 4458 } 4459 } 4460 } 4461 4462 next_sec = round_jiffies_up(next); 4463 next_sched = next; 4464 4465 /* If rounded timeout is accurate enough, accept it. */ 4466 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ)) 4467 next_sched = next_sec; 4468 4469 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */ 4470 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX)) 4471 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX; 4472 4473 pr_debug("now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n", 4474 now, next, next_sec, next_sched); 4475 mod_delayed_work(addrconf_wq, &addr_chk_work, next_sched - now); 4476 rcu_read_unlock_bh(); 4477 } 4478 4479 static void addrconf_verify_work(struct work_struct *w) 4480 { 4481 rtnl_lock(); 4482 addrconf_verify_rtnl(); 4483 rtnl_unlock(); 4484 } 4485 4486 static void addrconf_verify(void) 4487 { 4488 mod_delayed_work(addrconf_wq, &addr_chk_work, 0); 4489 } 4490 4491 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local, 4492 struct in6_addr **peer_pfx) 4493 { 4494 struct in6_addr *pfx = NULL; 4495 4496 *peer_pfx = NULL; 4497 4498 if (addr) 4499 pfx = nla_data(addr); 4500 4501 if (local) { 4502 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx))) 4503 *peer_pfx = pfx; 4504 pfx = nla_data(local); 4505 } 4506 4507 return pfx; 4508 } 4509 4510 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = { 4511 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) }, 4512 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) }, 4513 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) }, 4514 [IFA_FLAGS] = { .len = sizeof(u32) }, 4515 [IFA_RT_PRIORITY] = { .len = sizeof(u32) }, 4516 [IFA_TARGET_NETNSID] = { .type = NLA_S32 }, 4517 }; 4518 4519 static int 4520 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, 4521 struct netlink_ext_ack *extack) 4522 { 4523 struct net *net = sock_net(skb->sk); 4524 struct ifaddrmsg *ifm; 4525 struct nlattr *tb[IFA_MAX+1]; 4526 struct in6_addr *pfx, *peer_pfx; 4527 u32 ifa_flags; 4528 int err; 4529 4530 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy, 4531 extack); 4532 if (err < 0) 4533 return err; 4534 4535 ifm = nlmsg_data(nlh); 4536 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx); 4537 if (!pfx) 4538 return -EINVAL; 4539 4540 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags; 4541 4542 /* We ignore other flags so far. */ 4543 ifa_flags &= IFA_F_MANAGETEMPADDR; 4544 4545 return inet6_addr_del(net, ifm->ifa_index, ifa_flags, pfx, 4546 ifm->ifa_prefixlen); 4547 } 4548 4549 static int modify_prefix_route(struct inet6_ifaddr *ifp, 4550 unsigned long expires, u32 flags) 4551 { 4552 struct fib6_info *f6i; 4553 u32 prio; 4554 4555 f6i = addrconf_get_prefix_route(&ifp->addr, 4556 ifp->prefix_len, 4557 ifp->idev->dev, 4558 0, RTF_GATEWAY | RTF_DEFAULT); 4559 if (!f6i) 4560 return -ENOENT; 4561 4562 prio = ifp->rt_priority ? : IP6_RT_PRIO_ADDRCONF; 4563 if (f6i->fib6_metric != prio) { 4564 /* delete old one */ 4565 ip6_del_rt(dev_net(ifp->idev->dev), f6i); 4566 4567 /* add new one */ 4568 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, 4569 ifp->rt_priority, ifp->idev->dev, 4570 expires, flags, GFP_KERNEL); 4571 } else { 4572 if (!expires) 4573 fib6_clean_expires(f6i); 4574 else 4575 fib6_set_expires(f6i, expires); 4576 4577 fib6_info_release(f6i); 4578 } 4579 4580 return 0; 4581 } 4582 4583 static int inet6_addr_modify(struct inet6_ifaddr *ifp, struct ifa6_config *cfg) 4584 { 4585 u32 flags; 4586 clock_t expires; 4587 unsigned long timeout; 4588 bool was_managetempaddr; 4589 bool had_prefixroute; 4590 4591 ASSERT_RTNL(); 4592 4593 if (!cfg->valid_lft || cfg->preferred_lft > cfg->valid_lft) 4594 return -EINVAL; 4595 4596 if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR && 4597 (ifp->flags & IFA_F_TEMPORARY || ifp->prefix_len != 64)) 4598 return -EINVAL; 4599 4600 if (!(ifp->flags & IFA_F_TENTATIVE) || ifp->flags & IFA_F_DADFAILED) 4601 cfg->ifa_flags &= ~IFA_F_OPTIMISTIC; 4602 4603 timeout = addrconf_timeout_fixup(cfg->valid_lft, HZ); 4604 if (addrconf_finite_timeout(timeout)) { 4605 expires = jiffies_to_clock_t(timeout * HZ); 4606 cfg->valid_lft = timeout; 4607 flags = RTF_EXPIRES; 4608 } else { 4609 expires = 0; 4610 flags = 0; 4611 cfg->ifa_flags |= IFA_F_PERMANENT; 4612 } 4613 4614 timeout = addrconf_timeout_fixup(cfg->preferred_lft, HZ); 4615 if (addrconf_finite_timeout(timeout)) { 4616 if (timeout == 0) 4617 cfg->ifa_flags |= IFA_F_DEPRECATED; 4618 cfg->preferred_lft = timeout; 4619 } 4620 4621 spin_lock_bh(&ifp->lock); 4622 was_managetempaddr = ifp->flags & IFA_F_MANAGETEMPADDR; 4623 had_prefixroute = ifp->flags & IFA_F_PERMANENT && 4624 !(ifp->flags & IFA_F_NOPREFIXROUTE); 4625 ifp->flags &= ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | 4626 IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR | 4627 IFA_F_NOPREFIXROUTE); 4628 ifp->flags |= cfg->ifa_flags; 4629 ifp->tstamp = jiffies; 4630 ifp->valid_lft = cfg->valid_lft; 4631 ifp->prefered_lft = cfg->preferred_lft; 4632 4633 if (cfg->rt_priority && cfg->rt_priority != ifp->rt_priority) 4634 ifp->rt_priority = cfg->rt_priority; 4635 4636 spin_unlock_bh(&ifp->lock); 4637 if (!(ifp->flags&IFA_F_TENTATIVE)) 4638 ipv6_ifa_notify(0, ifp); 4639 4640 if (!(cfg->ifa_flags & IFA_F_NOPREFIXROUTE)) { 4641 int rc = -ENOENT; 4642 4643 if (had_prefixroute) 4644 rc = modify_prefix_route(ifp, expires, flags); 4645 4646 /* prefix route could have been deleted; if so restore it */ 4647 if (rc == -ENOENT) { 4648 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, 4649 ifp->rt_priority, ifp->idev->dev, 4650 expires, flags, GFP_KERNEL); 4651 } 4652 } else if (had_prefixroute) { 4653 enum cleanup_prefix_rt_t action; 4654 unsigned long rt_expires; 4655 4656 write_lock_bh(&ifp->idev->lock); 4657 action = check_cleanup_prefix_route(ifp, &rt_expires); 4658 write_unlock_bh(&ifp->idev->lock); 4659 4660 if (action != CLEANUP_PREFIX_RT_NOP) { 4661 cleanup_prefix_route(ifp, rt_expires, 4662 action == CLEANUP_PREFIX_RT_DEL); 4663 } 4664 } 4665 4666 if (was_managetempaddr || ifp->flags & IFA_F_MANAGETEMPADDR) { 4667 if (was_managetempaddr && 4668 !(ifp->flags & IFA_F_MANAGETEMPADDR)) { 4669 cfg->valid_lft = 0; 4670 cfg->preferred_lft = 0; 4671 } 4672 manage_tempaddrs(ifp->idev, ifp, cfg->valid_lft, 4673 cfg->preferred_lft, !was_managetempaddr, 4674 jiffies); 4675 } 4676 4677 addrconf_verify_rtnl(); 4678 4679 return 0; 4680 } 4681 4682 static int 4683 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, 4684 struct netlink_ext_ack *extack) 4685 { 4686 struct net *net = sock_net(skb->sk); 4687 struct ifaddrmsg *ifm; 4688 struct nlattr *tb[IFA_MAX+1]; 4689 struct in6_addr *peer_pfx; 4690 struct inet6_ifaddr *ifa; 4691 struct net_device *dev; 4692 struct inet6_dev *idev; 4693 struct ifa6_config cfg; 4694 int err; 4695 4696 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy, 4697 extack); 4698 if (err < 0) 4699 return err; 4700 4701 memset(&cfg, 0, sizeof(cfg)); 4702 4703 ifm = nlmsg_data(nlh); 4704 cfg.pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx); 4705 if (!cfg.pfx) 4706 return -EINVAL; 4707 4708 cfg.peer_pfx = peer_pfx; 4709 cfg.plen = ifm->ifa_prefixlen; 4710 if (tb[IFA_RT_PRIORITY]) 4711 cfg.rt_priority = nla_get_u32(tb[IFA_RT_PRIORITY]); 4712 4713 cfg.valid_lft = INFINITY_LIFE_TIME; 4714 cfg.preferred_lft = INFINITY_LIFE_TIME; 4715 4716 if (tb[IFA_CACHEINFO]) { 4717 struct ifa_cacheinfo *ci; 4718 4719 ci = nla_data(tb[IFA_CACHEINFO]); 4720 cfg.valid_lft = ci->ifa_valid; 4721 cfg.preferred_lft = ci->ifa_prefered; 4722 } 4723 4724 dev = __dev_get_by_index(net, ifm->ifa_index); 4725 if (!dev) 4726 return -ENODEV; 4727 4728 if (tb[IFA_FLAGS]) 4729 cfg.ifa_flags = nla_get_u32(tb[IFA_FLAGS]); 4730 else 4731 cfg.ifa_flags = ifm->ifa_flags; 4732 4733 /* We ignore other flags so far. */ 4734 cfg.ifa_flags &= IFA_F_NODAD | IFA_F_HOMEADDRESS | 4735 IFA_F_MANAGETEMPADDR | IFA_F_NOPREFIXROUTE | 4736 IFA_F_MCAUTOJOIN | IFA_F_OPTIMISTIC; 4737 4738 idev = ipv6_find_idev(dev); 4739 if (!idev) 4740 return -ENOBUFS; 4741 4742 if (!ipv6_allow_optimistic_dad(net, idev)) 4743 cfg.ifa_flags &= ~IFA_F_OPTIMISTIC; 4744 4745 if (cfg.ifa_flags & IFA_F_NODAD && 4746 cfg.ifa_flags & IFA_F_OPTIMISTIC) { 4747 NL_SET_ERR_MSG(extack, "IFA_F_NODAD and IFA_F_OPTIMISTIC are mutually exclusive"); 4748 return -EINVAL; 4749 } 4750 4751 ifa = ipv6_get_ifaddr(net, cfg.pfx, dev, 1); 4752 if (!ifa) { 4753 /* 4754 * It would be best to check for !NLM_F_CREATE here but 4755 * userspace already relies on not having to provide this. 4756 */ 4757 return inet6_addr_add(net, ifm->ifa_index, &cfg, extack); 4758 } 4759 4760 if (nlh->nlmsg_flags & NLM_F_EXCL || 4761 !(nlh->nlmsg_flags & NLM_F_REPLACE)) 4762 err = -EEXIST; 4763 else 4764 err = inet6_addr_modify(ifa, &cfg); 4765 4766 in6_ifa_put(ifa); 4767 4768 return err; 4769 } 4770 4771 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u32 flags, 4772 u8 scope, int ifindex) 4773 { 4774 struct ifaddrmsg *ifm; 4775 4776 ifm = nlmsg_data(nlh); 4777 ifm->ifa_family = AF_INET6; 4778 ifm->ifa_prefixlen = prefixlen; 4779 ifm->ifa_flags = flags; 4780 ifm->ifa_scope = scope; 4781 ifm->ifa_index = ifindex; 4782 } 4783 4784 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp, 4785 unsigned long tstamp, u32 preferred, u32 valid) 4786 { 4787 struct ifa_cacheinfo ci; 4788 4789 ci.cstamp = cstamp_delta(cstamp); 4790 ci.tstamp = cstamp_delta(tstamp); 4791 ci.ifa_prefered = preferred; 4792 ci.ifa_valid = valid; 4793 4794 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci); 4795 } 4796 4797 static inline int rt_scope(int ifa_scope) 4798 { 4799 if (ifa_scope & IFA_HOST) 4800 return RT_SCOPE_HOST; 4801 else if (ifa_scope & IFA_LINK) 4802 return RT_SCOPE_LINK; 4803 else if (ifa_scope & IFA_SITE) 4804 return RT_SCOPE_SITE; 4805 else 4806 return RT_SCOPE_UNIVERSE; 4807 } 4808 4809 static inline int inet6_ifaddr_msgsize(void) 4810 { 4811 return NLMSG_ALIGN(sizeof(struct ifaddrmsg)) 4812 + nla_total_size(16) /* IFA_LOCAL */ 4813 + nla_total_size(16) /* IFA_ADDRESS */ 4814 + nla_total_size(sizeof(struct ifa_cacheinfo)) 4815 + nla_total_size(4) /* IFA_FLAGS */ 4816 + nla_total_size(4) /* IFA_RT_PRIORITY */; 4817 } 4818 4819 enum addr_type_t { 4820 UNICAST_ADDR, 4821 MULTICAST_ADDR, 4822 ANYCAST_ADDR, 4823 }; 4824 4825 struct inet6_fill_args { 4826 u32 portid; 4827 u32 seq; 4828 int event; 4829 unsigned int flags; 4830 int netnsid; 4831 int ifindex; 4832 enum addr_type_t type; 4833 }; 4834 4835 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa, 4836 struct inet6_fill_args *args) 4837 { 4838 struct nlmsghdr *nlh; 4839 u32 preferred, valid; 4840 4841 nlh = nlmsg_put(skb, args->portid, args->seq, args->event, 4842 sizeof(struct ifaddrmsg), args->flags); 4843 if (!nlh) 4844 return -EMSGSIZE; 4845 4846 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope), 4847 ifa->idev->dev->ifindex); 4848 4849 if (args->netnsid >= 0 && 4850 nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid)) 4851 goto error; 4852 4853 if (!((ifa->flags&IFA_F_PERMANENT) && 4854 (ifa->prefered_lft == INFINITY_LIFE_TIME))) { 4855 preferred = ifa->prefered_lft; 4856 valid = ifa->valid_lft; 4857 if (preferred != INFINITY_LIFE_TIME) { 4858 long tval = (jiffies - ifa->tstamp)/HZ; 4859 if (preferred > tval) 4860 preferred -= tval; 4861 else 4862 preferred = 0; 4863 if (valid != INFINITY_LIFE_TIME) { 4864 if (valid > tval) 4865 valid -= tval; 4866 else 4867 valid = 0; 4868 } 4869 } 4870 } else { 4871 preferred = INFINITY_LIFE_TIME; 4872 valid = INFINITY_LIFE_TIME; 4873 } 4874 4875 if (!ipv6_addr_any(&ifa->peer_addr)) { 4876 if (nla_put_in6_addr(skb, IFA_LOCAL, &ifa->addr) < 0 || 4877 nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->peer_addr) < 0) 4878 goto error; 4879 } else 4880 if (nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->addr) < 0) 4881 goto error; 4882 4883 if (ifa->rt_priority && 4884 nla_put_u32(skb, IFA_RT_PRIORITY, ifa->rt_priority)) 4885 goto error; 4886 4887 if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) 4888 goto error; 4889 4890 if (nla_put_u32(skb, IFA_FLAGS, ifa->flags) < 0) 4891 goto error; 4892 4893 nlmsg_end(skb, nlh); 4894 return 0; 4895 4896 error: 4897 nlmsg_cancel(skb, nlh); 4898 return -EMSGSIZE; 4899 } 4900 4901 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca, 4902 struct inet6_fill_args *args) 4903 { 4904 struct nlmsghdr *nlh; 4905 u8 scope = RT_SCOPE_UNIVERSE; 4906 int ifindex = ifmca->idev->dev->ifindex; 4907 4908 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE) 4909 scope = RT_SCOPE_SITE; 4910 4911 nlh = nlmsg_put(skb, args->portid, args->seq, args->event, 4912 sizeof(struct ifaddrmsg), args->flags); 4913 if (!nlh) 4914 return -EMSGSIZE; 4915 4916 if (args->netnsid >= 0 && 4917 nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid)) 4918 return -EMSGSIZE; 4919 4920 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 4921 if (nla_put_in6_addr(skb, IFA_MULTICAST, &ifmca->mca_addr) < 0 || 4922 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp, 4923 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 4924 nlmsg_cancel(skb, nlh); 4925 return -EMSGSIZE; 4926 } 4927 4928 nlmsg_end(skb, nlh); 4929 return 0; 4930 } 4931 4932 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca, 4933 struct inet6_fill_args *args) 4934 { 4935 struct net_device *dev = fib6_info_nh_dev(ifaca->aca_rt); 4936 int ifindex = dev ? dev->ifindex : 1; 4937 struct nlmsghdr *nlh; 4938 u8 scope = RT_SCOPE_UNIVERSE; 4939 4940 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE) 4941 scope = RT_SCOPE_SITE; 4942 4943 nlh = nlmsg_put(skb, args->portid, args->seq, args->event, 4944 sizeof(struct ifaddrmsg), args->flags); 4945 if (!nlh) 4946 return -EMSGSIZE; 4947 4948 if (args->netnsid >= 0 && 4949 nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid)) 4950 return -EMSGSIZE; 4951 4952 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 4953 if (nla_put_in6_addr(skb, IFA_ANYCAST, &ifaca->aca_addr) < 0 || 4954 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp, 4955 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 4956 nlmsg_cancel(skb, nlh); 4957 return -EMSGSIZE; 4958 } 4959 4960 nlmsg_end(skb, nlh); 4961 return 0; 4962 } 4963 4964 /* called with rcu_read_lock() */ 4965 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb, 4966 struct netlink_callback *cb, int s_ip_idx, 4967 struct inet6_fill_args *fillargs) 4968 { 4969 struct ifmcaddr6 *ifmca; 4970 struct ifacaddr6 *ifaca; 4971 int ip_idx = 0; 4972 int err = 1; 4973 4974 read_lock_bh(&idev->lock); 4975 switch (fillargs->type) { 4976 case UNICAST_ADDR: { 4977 struct inet6_ifaddr *ifa; 4978 fillargs->event = RTM_NEWADDR; 4979 4980 /* unicast address incl. temp addr */ 4981 list_for_each_entry(ifa, &idev->addr_list, if_list) { 4982 if (ip_idx < s_ip_idx) 4983 goto next; 4984 err = inet6_fill_ifaddr(skb, ifa, fillargs); 4985 if (err < 0) 4986 break; 4987 nl_dump_check_consistent(cb, nlmsg_hdr(skb)); 4988 next: 4989 ip_idx++; 4990 } 4991 break; 4992 } 4993 case MULTICAST_ADDR: 4994 fillargs->event = RTM_GETMULTICAST; 4995 4996 /* multicast address */ 4997 for (ifmca = idev->mc_list; ifmca; 4998 ifmca = ifmca->next, ip_idx++) { 4999 if (ip_idx < s_ip_idx) 5000 continue; 5001 err = inet6_fill_ifmcaddr(skb, ifmca, fillargs); 5002 if (err < 0) 5003 break; 5004 } 5005 break; 5006 case ANYCAST_ADDR: 5007 fillargs->event = RTM_GETANYCAST; 5008 /* anycast address */ 5009 for (ifaca = idev->ac_list; ifaca; 5010 ifaca = ifaca->aca_next, ip_idx++) { 5011 if (ip_idx < s_ip_idx) 5012 continue; 5013 err = inet6_fill_ifacaddr(skb, ifaca, fillargs); 5014 if (err < 0) 5015 break; 5016 } 5017 break; 5018 default: 5019 break; 5020 } 5021 read_unlock_bh(&idev->lock); 5022 cb->args[2] = ip_idx; 5023 return err; 5024 } 5025 5026 static int inet6_valid_dump_ifaddr_req(const struct nlmsghdr *nlh, 5027 struct inet6_fill_args *fillargs, 5028 struct net **tgt_net, struct sock *sk, 5029 struct netlink_callback *cb) 5030 { 5031 struct netlink_ext_ack *extack = cb->extack; 5032 struct nlattr *tb[IFA_MAX+1]; 5033 struct ifaddrmsg *ifm; 5034 int err, i; 5035 5036 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) { 5037 NL_SET_ERR_MSG_MOD(extack, "Invalid header for address dump request"); 5038 return -EINVAL; 5039 } 5040 5041 ifm = nlmsg_data(nlh); 5042 if (ifm->ifa_prefixlen || ifm->ifa_flags || ifm->ifa_scope) { 5043 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for address dump request"); 5044 return -EINVAL; 5045 } 5046 5047 fillargs->ifindex = ifm->ifa_index; 5048 if (fillargs->ifindex) { 5049 cb->answer_flags |= NLM_F_DUMP_FILTERED; 5050 fillargs->flags |= NLM_F_DUMP_FILTERED; 5051 } 5052 5053 err = nlmsg_parse_strict(nlh, sizeof(*ifm), tb, IFA_MAX, 5054 ifa_ipv6_policy, extack); 5055 if (err < 0) 5056 return err; 5057 5058 for (i = 0; i <= IFA_MAX; ++i) { 5059 if (!tb[i]) 5060 continue; 5061 5062 if (i == IFA_TARGET_NETNSID) { 5063 struct net *net; 5064 5065 fillargs->netnsid = nla_get_s32(tb[i]); 5066 net = rtnl_get_net_ns_capable(sk, fillargs->netnsid); 5067 if (IS_ERR(net)) { 5068 fillargs->netnsid = -1; 5069 NL_SET_ERR_MSG_MOD(extack, "Invalid target network namespace id"); 5070 return PTR_ERR(net); 5071 } 5072 *tgt_net = net; 5073 } else { 5074 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in dump request"); 5075 return -EINVAL; 5076 } 5077 } 5078 5079 return 0; 5080 } 5081 5082 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb, 5083 enum addr_type_t type) 5084 { 5085 const struct nlmsghdr *nlh = cb->nlh; 5086 struct inet6_fill_args fillargs = { 5087 .portid = NETLINK_CB(cb->skb).portid, 5088 .seq = cb->nlh->nlmsg_seq, 5089 .flags = NLM_F_MULTI, 5090 .netnsid = -1, 5091 .type = type, 5092 }; 5093 struct net *net = sock_net(skb->sk); 5094 struct net *tgt_net = net; 5095 int idx, s_idx, s_ip_idx; 5096 int h, s_h; 5097 struct net_device *dev; 5098 struct inet6_dev *idev; 5099 struct hlist_head *head; 5100 int err = 0; 5101 5102 s_h = cb->args[0]; 5103 s_idx = idx = cb->args[1]; 5104 s_ip_idx = cb->args[2]; 5105 5106 if (cb->strict_check) { 5107 err = inet6_valid_dump_ifaddr_req(nlh, &fillargs, &tgt_net, 5108 skb->sk, cb); 5109 if (err < 0) 5110 goto put_tgt_net; 5111 5112 err = 0; 5113 if (fillargs.ifindex) { 5114 dev = __dev_get_by_index(tgt_net, fillargs.ifindex); 5115 if (!dev) { 5116 err = -ENODEV; 5117 goto put_tgt_net; 5118 } 5119 idev = __in6_dev_get(dev); 5120 if (idev) { 5121 err = in6_dump_addrs(idev, skb, cb, s_ip_idx, 5122 &fillargs); 5123 if (err > 0) 5124 err = 0; 5125 } 5126 goto put_tgt_net; 5127 } 5128 } 5129 5130 rcu_read_lock(); 5131 cb->seq = atomic_read(&tgt_net->ipv6.dev_addr_genid) ^ tgt_net->dev_base_seq; 5132 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 5133 idx = 0; 5134 head = &tgt_net->dev_index_head[h]; 5135 hlist_for_each_entry_rcu(dev, head, index_hlist) { 5136 if (idx < s_idx) 5137 goto cont; 5138 if (h > s_h || idx > s_idx) 5139 s_ip_idx = 0; 5140 idev = __in6_dev_get(dev); 5141 if (!idev) 5142 goto cont; 5143 5144 if (in6_dump_addrs(idev, skb, cb, s_ip_idx, 5145 &fillargs) < 0) 5146 goto done; 5147 cont: 5148 idx++; 5149 } 5150 } 5151 done: 5152 rcu_read_unlock(); 5153 cb->args[0] = h; 5154 cb->args[1] = idx; 5155 put_tgt_net: 5156 if (fillargs.netnsid >= 0) 5157 put_net(tgt_net); 5158 5159 return skb->len ? : err; 5160 } 5161 5162 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb) 5163 { 5164 enum addr_type_t type = UNICAST_ADDR; 5165 5166 return inet6_dump_addr(skb, cb, type); 5167 } 5168 5169 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb) 5170 { 5171 enum addr_type_t type = MULTICAST_ADDR; 5172 5173 return inet6_dump_addr(skb, cb, type); 5174 } 5175 5176 5177 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb) 5178 { 5179 enum addr_type_t type = ANYCAST_ADDR; 5180 5181 return inet6_dump_addr(skb, cb, type); 5182 } 5183 5184 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh, 5185 struct netlink_ext_ack *extack) 5186 { 5187 struct net *net = sock_net(in_skb->sk); 5188 struct inet6_fill_args fillargs = { 5189 .portid = NETLINK_CB(in_skb).portid, 5190 .seq = nlh->nlmsg_seq, 5191 .event = RTM_NEWADDR, 5192 .flags = 0, 5193 .netnsid = -1, 5194 }; 5195 struct net *tgt_net = net; 5196 struct ifaddrmsg *ifm; 5197 struct nlattr *tb[IFA_MAX+1]; 5198 struct in6_addr *addr = NULL, *peer; 5199 struct net_device *dev = NULL; 5200 struct inet6_ifaddr *ifa; 5201 struct sk_buff *skb; 5202 int err; 5203 5204 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy, 5205 extack); 5206 if (err < 0) 5207 return err; 5208 5209 if (tb[IFA_TARGET_NETNSID]) { 5210 fillargs.netnsid = nla_get_s32(tb[IFA_TARGET_NETNSID]); 5211 5212 tgt_net = rtnl_get_net_ns_capable(NETLINK_CB(in_skb).sk, 5213 fillargs.netnsid); 5214 if (IS_ERR(tgt_net)) 5215 return PTR_ERR(tgt_net); 5216 } 5217 5218 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer); 5219 if (!addr) 5220 return -EINVAL; 5221 5222 ifm = nlmsg_data(nlh); 5223 if (ifm->ifa_index) 5224 dev = dev_get_by_index(tgt_net, ifm->ifa_index); 5225 5226 ifa = ipv6_get_ifaddr(tgt_net, addr, dev, 1); 5227 if (!ifa) { 5228 err = -EADDRNOTAVAIL; 5229 goto errout; 5230 } 5231 5232 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL); 5233 if (!skb) { 5234 err = -ENOBUFS; 5235 goto errout_ifa; 5236 } 5237 5238 err = inet6_fill_ifaddr(skb, ifa, &fillargs); 5239 if (err < 0) { 5240 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 5241 WARN_ON(err == -EMSGSIZE); 5242 kfree_skb(skb); 5243 goto errout_ifa; 5244 } 5245 err = rtnl_unicast(skb, tgt_net, NETLINK_CB(in_skb).portid); 5246 errout_ifa: 5247 in6_ifa_put(ifa); 5248 errout: 5249 if (dev) 5250 dev_put(dev); 5251 if (fillargs.netnsid >= 0) 5252 put_net(tgt_net); 5253 5254 return err; 5255 } 5256 5257 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa) 5258 { 5259 struct sk_buff *skb; 5260 struct net *net = dev_net(ifa->idev->dev); 5261 struct inet6_fill_args fillargs = { 5262 .portid = 0, 5263 .seq = 0, 5264 .event = event, 5265 .flags = 0, 5266 .netnsid = -1, 5267 }; 5268 int err = -ENOBUFS; 5269 5270 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC); 5271 if (!skb) 5272 goto errout; 5273 5274 err = inet6_fill_ifaddr(skb, ifa, &fillargs); 5275 if (err < 0) { 5276 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 5277 WARN_ON(err == -EMSGSIZE); 5278 kfree_skb(skb); 5279 goto errout; 5280 } 5281 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC); 5282 return; 5283 errout: 5284 if (err < 0) 5285 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err); 5286 } 5287 5288 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf, 5289 __s32 *array, int bytes) 5290 { 5291 BUG_ON(bytes < (DEVCONF_MAX * 4)); 5292 5293 memset(array, 0, bytes); 5294 array[DEVCONF_FORWARDING] = cnf->forwarding; 5295 array[DEVCONF_HOPLIMIT] = cnf->hop_limit; 5296 array[DEVCONF_MTU6] = cnf->mtu6; 5297 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra; 5298 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects; 5299 array[DEVCONF_AUTOCONF] = cnf->autoconf; 5300 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits; 5301 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits; 5302 array[DEVCONF_RTR_SOLICIT_INTERVAL] = 5303 jiffies_to_msecs(cnf->rtr_solicit_interval); 5304 array[DEVCONF_RTR_SOLICIT_MAX_INTERVAL] = 5305 jiffies_to_msecs(cnf->rtr_solicit_max_interval); 5306 array[DEVCONF_RTR_SOLICIT_DELAY] = 5307 jiffies_to_msecs(cnf->rtr_solicit_delay); 5308 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version; 5309 array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] = 5310 jiffies_to_msecs(cnf->mldv1_unsolicited_report_interval); 5311 array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] = 5312 jiffies_to_msecs(cnf->mldv2_unsolicited_report_interval); 5313 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr; 5314 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft; 5315 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft; 5316 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry; 5317 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor; 5318 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses; 5319 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr; 5320 array[DEVCONF_ACCEPT_RA_MIN_HOP_LIMIT] = cnf->accept_ra_min_hop_limit; 5321 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo; 5322 #ifdef CONFIG_IPV6_ROUTER_PREF 5323 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref; 5324 array[DEVCONF_RTR_PROBE_INTERVAL] = 5325 jiffies_to_msecs(cnf->rtr_probe_interval); 5326 #ifdef CONFIG_IPV6_ROUTE_INFO 5327 array[DEVCONF_ACCEPT_RA_RT_INFO_MIN_PLEN] = cnf->accept_ra_rt_info_min_plen; 5328 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen; 5329 #endif 5330 #endif 5331 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp; 5332 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route; 5333 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 5334 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad; 5335 array[DEVCONF_USE_OPTIMISTIC] = cnf->use_optimistic; 5336 #endif 5337 #ifdef CONFIG_IPV6_MROUTE 5338 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding; 5339 #endif 5340 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6; 5341 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad; 5342 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao; 5343 array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify; 5344 array[DEVCONF_SUPPRESS_FRAG_NDISC] = cnf->suppress_frag_ndisc; 5345 array[DEVCONF_ACCEPT_RA_FROM_LOCAL] = cnf->accept_ra_from_local; 5346 array[DEVCONF_ACCEPT_RA_MTU] = cnf->accept_ra_mtu; 5347 array[DEVCONF_IGNORE_ROUTES_WITH_LINKDOWN] = cnf->ignore_routes_with_linkdown; 5348 /* we omit DEVCONF_STABLE_SECRET for now */ 5349 array[DEVCONF_USE_OIF_ADDRS_ONLY] = cnf->use_oif_addrs_only; 5350 array[DEVCONF_DROP_UNICAST_IN_L2_MULTICAST] = cnf->drop_unicast_in_l2_multicast; 5351 array[DEVCONF_DROP_UNSOLICITED_NA] = cnf->drop_unsolicited_na; 5352 array[DEVCONF_KEEP_ADDR_ON_DOWN] = cnf->keep_addr_on_down; 5353 array[DEVCONF_SEG6_ENABLED] = cnf->seg6_enabled; 5354 #ifdef CONFIG_IPV6_SEG6_HMAC 5355 array[DEVCONF_SEG6_REQUIRE_HMAC] = cnf->seg6_require_hmac; 5356 #endif 5357 array[DEVCONF_ENHANCED_DAD] = cnf->enhanced_dad; 5358 array[DEVCONF_ADDR_GEN_MODE] = cnf->addr_gen_mode; 5359 array[DEVCONF_DISABLE_POLICY] = cnf->disable_policy; 5360 array[DEVCONF_NDISC_TCLASS] = cnf->ndisc_tclass; 5361 } 5362 5363 static inline size_t inet6_ifla6_size(void) 5364 { 5365 return nla_total_size(4) /* IFLA_INET6_FLAGS */ 5366 + nla_total_size(sizeof(struct ifla_cacheinfo)) 5367 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */ 5368 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */ 5369 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */ 5370 + nla_total_size(sizeof(struct in6_addr)) /* IFLA_INET6_TOKEN */ 5371 + nla_total_size(1) /* IFLA_INET6_ADDR_GEN_MODE */ 5372 + 0; 5373 } 5374 5375 static inline size_t inet6_if_nlmsg_size(void) 5376 { 5377 return NLMSG_ALIGN(sizeof(struct ifinfomsg)) 5378 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */ 5379 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */ 5380 + nla_total_size(4) /* IFLA_MTU */ 5381 + nla_total_size(4) /* IFLA_LINK */ 5382 + nla_total_size(1) /* IFLA_OPERSTATE */ 5383 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */ 5384 } 5385 5386 static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib, 5387 int bytes) 5388 { 5389 int i; 5390 int pad = bytes - sizeof(u64) * ICMP6_MIB_MAX; 5391 BUG_ON(pad < 0); 5392 5393 /* Use put_unaligned() because stats may not be aligned for u64. */ 5394 put_unaligned(ICMP6_MIB_MAX, &stats[0]); 5395 for (i = 1; i < ICMP6_MIB_MAX; i++) 5396 put_unaligned(atomic_long_read(&mib[i]), &stats[i]); 5397 5398 memset(&stats[ICMP6_MIB_MAX], 0, pad); 5399 } 5400 5401 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu *mib, 5402 int bytes, size_t syncpoff) 5403 { 5404 int i, c; 5405 u64 buff[IPSTATS_MIB_MAX]; 5406 int pad = bytes - sizeof(u64) * IPSTATS_MIB_MAX; 5407 5408 BUG_ON(pad < 0); 5409 5410 memset(buff, 0, sizeof(buff)); 5411 buff[0] = IPSTATS_MIB_MAX; 5412 5413 for_each_possible_cpu(c) { 5414 for (i = 1; i < IPSTATS_MIB_MAX; i++) 5415 buff[i] += snmp_get_cpu_field64(mib, c, i, syncpoff); 5416 } 5417 5418 memcpy(stats, buff, IPSTATS_MIB_MAX * sizeof(u64)); 5419 memset(&stats[IPSTATS_MIB_MAX], 0, pad); 5420 } 5421 5422 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype, 5423 int bytes) 5424 { 5425 switch (attrtype) { 5426 case IFLA_INET6_STATS: 5427 __snmp6_fill_stats64(stats, idev->stats.ipv6, bytes, 5428 offsetof(struct ipstats_mib, syncp)); 5429 break; 5430 case IFLA_INET6_ICMP6STATS: 5431 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, bytes); 5432 break; 5433 } 5434 } 5435 5436 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev, 5437 u32 ext_filter_mask) 5438 { 5439 struct nlattr *nla; 5440 struct ifla_cacheinfo ci; 5441 5442 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags)) 5443 goto nla_put_failure; 5444 ci.max_reasm_len = IPV6_MAXPLEN; 5445 ci.tstamp = cstamp_delta(idev->tstamp); 5446 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time); 5447 ci.retrans_time = jiffies_to_msecs(NEIGH_VAR(idev->nd_parms, RETRANS_TIME)); 5448 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci)) 5449 goto nla_put_failure; 5450 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32)); 5451 if (!nla) 5452 goto nla_put_failure; 5453 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla)); 5454 5455 /* XXX - MC not implemented */ 5456 5457 if (ext_filter_mask & RTEXT_FILTER_SKIP_STATS) 5458 return 0; 5459 5460 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64)); 5461 if (!nla) 5462 goto nla_put_failure; 5463 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla)); 5464 5465 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64)); 5466 if (!nla) 5467 goto nla_put_failure; 5468 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla)); 5469 5470 nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr)); 5471 if (!nla) 5472 goto nla_put_failure; 5473 5474 if (nla_put_u8(skb, IFLA_INET6_ADDR_GEN_MODE, idev->cnf.addr_gen_mode)) 5475 goto nla_put_failure; 5476 5477 read_lock_bh(&idev->lock); 5478 memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla)); 5479 read_unlock_bh(&idev->lock); 5480 5481 return 0; 5482 5483 nla_put_failure: 5484 return -EMSGSIZE; 5485 } 5486 5487 static size_t inet6_get_link_af_size(const struct net_device *dev, 5488 u32 ext_filter_mask) 5489 { 5490 if (!__in6_dev_get(dev)) 5491 return 0; 5492 5493 return inet6_ifla6_size(); 5494 } 5495 5496 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev, 5497 u32 ext_filter_mask) 5498 { 5499 struct inet6_dev *idev = __in6_dev_get(dev); 5500 5501 if (!idev) 5502 return -ENODATA; 5503 5504 if (inet6_fill_ifla6_attrs(skb, idev, ext_filter_mask) < 0) 5505 return -EMSGSIZE; 5506 5507 return 0; 5508 } 5509 5510 static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token) 5511 { 5512 struct inet6_ifaddr *ifp; 5513 struct net_device *dev = idev->dev; 5514 bool clear_token, update_rs = false; 5515 struct in6_addr ll_addr; 5516 5517 ASSERT_RTNL(); 5518 5519 if (!token) 5520 return -EINVAL; 5521 if (dev->flags & (IFF_LOOPBACK | IFF_NOARP)) 5522 return -EINVAL; 5523 if (!ipv6_accept_ra(idev)) 5524 return -EINVAL; 5525 if (idev->cnf.rtr_solicits == 0) 5526 return -EINVAL; 5527 5528 write_lock_bh(&idev->lock); 5529 5530 BUILD_BUG_ON(sizeof(token->s6_addr) != 16); 5531 memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8); 5532 5533 write_unlock_bh(&idev->lock); 5534 5535 clear_token = ipv6_addr_any(token); 5536 if (clear_token) 5537 goto update_lft; 5538 5539 if (!idev->dead && (idev->if_flags & IF_READY) && 5540 !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE | 5541 IFA_F_OPTIMISTIC)) { 5542 /* If we're not ready, then normal ifup will take care 5543 * of this. Otherwise, we need to request our rs here. 5544 */ 5545 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters); 5546 update_rs = true; 5547 } 5548 5549 update_lft: 5550 write_lock_bh(&idev->lock); 5551 5552 if (update_rs) { 5553 idev->if_flags |= IF_RS_SENT; 5554 idev->rs_interval = rfc3315_s14_backoff_init( 5555 idev->cnf.rtr_solicit_interval); 5556 idev->rs_probes = 1; 5557 addrconf_mod_rs_timer(idev, idev->rs_interval); 5558 } 5559 5560 /* Well, that's kinda nasty ... */ 5561 list_for_each_entry(ifp, &idev->addr_list, if_list) { 5562 spin_lock(&ifp->lock); 5563 if (ifp->tokenized) { 5564 ifp->valid_lft = 0; 5565 ifp->prefered_lft = 0; 5566 } 5567 spin_unlock(&ifp->lock); 5568 } 5569 5570 write_unlock_bh(&idev->lock); 5571 inet6_ifinfo_notify(RTM_NEWLINK, idev); 5572 addrconf_verify_rtnl(); 5573 return 0; 5574 } 5575 5576 static const struct nla_policy inet6_af_policy[IFLA_INET6_MAX + 1] = { 5577 [IFLA_INET6_ADDR_GEN_MODE] = { .type = NLA_U8 }, 5578 [IFLA_INET6_TOKEN] = { .len = sizeof(struct in6_addr) }, 5579 }; 5580 5581 static int inet6_validate_link_af(const struct net_device *dev, 5582 const struct nlattr *nla) 5583 { 5584 struct nlattr *tb[IFLA_INET6_MAX + 1]; 5585 5586 if (dev && !__in6_dev_get(dev)) 5587 return -EAFNOSUPPORT; 5588 5589 return nla_parse_nested(tb, IFLA_INET6_MAX, nla, inet6_af_policy, 5590 NULL); 5591 } 5592 5593 static int check_addr_gen_mode(int mode) 5594 { 5595 if (mode != IN6_ADDR_GEN_MODE_EUI64 && 5596 mode != IN6_ADDR_GEN_MODE_NONE && 5597 mode != IN6_ADDR_GEN_MODE_STABLE_PRIVACY && 5598 mode != IN6_ADDR_GEN_MODE_RANDOM) 5599 return -EINVAL; 5600 return 1; 5601 } 5602 5603 static int check_stable_privacy(struct inet6_dev *idev, struct net *net, 5604 int mode) 5605 { 5606 if (mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY && 5607 !idev->cnf.stable_secret.initialized && 5608 !net->ipv6.devconf_dflt->stable_secret.initialized) 5609 return -EINVAL; 5610 return 1; 5611 } 5612 5613 static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla) 5614 { 5615 int err = -EINVAL; 5616 struct inet6_dev *idev = __in6_dev_get(dev); 5617 struct nlattr *tb[IFLA_INET6_MAX + 1]; 5618 5619 if (!idev) 5620 return -EAFNOSUPPORT; 5621 5622 if (nla_parse_nested(tb, IFLA_INET6_MAX, nla, NULL, NULL) < 0) 5623 BUG(); 5624 5625 if (tb[IFLA_INET6_TOKEN]) { 5626 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN])); 5627 if (err) 5628 return err; 5629 } 5630 5631 if (tb[IFLA_INET6_ADDR_GEN_MODE]) { 5632 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]); 5633 5634 if (check_addr_gen_mode(mode) < 0 || 5635 check_stable_privacy(idev, dev_net(dev), mode) < 0) 5636 return -EINVAL; 5637 5638 idev->cnf.addr_gen_mode = mode; 5639 err = 0; 5640 } 5641 5642 return err; 5643 } 5644 5645 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev, 5646 u32 portid, u32 seq, int event, unsigned int flags) 5647 { 5648 struct net_device *dev = idev->dev; 5649 struct ifinfomsg *hdr; 5650 struct nlmsghdr *nlh; 5651 void *protoinfo; 5652 5653 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags); 5654 if (!nlh) 5655 return -EMSGSIZE; 5656 5657 hdr = nlmsg_data(nlh); 5658 hdr->ifi_family = AF_INET6; 5659 hdr->__ifi_pad = 0; 5660 hdr->ifi_type = dev->type; 5661 hdr->ifi_index = dev->ifindex; 5662 hdr->ifi_flags = dev_get_flags(dev); 5663 hdr->ifi_change = 0; 5664 5665 if (nla_put_string(skb, IFLA_IFNAME, dev->name) || 5666 (dev->addr_len && 5667 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) || 5668 nla_put_u32(skb, IFLA_MTU, dev->mtu) || 5669 (dev->ifindex != dev_get_iflink(dev) && 5670 nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))) || 5671 nla_put_u8(skb, IFLA_OPERSTATE, 5672 netif_running(dev) ? dev->operstate : IF_OPER_DOWN)) 5673 goto nla_put_failure; 5674 protoinfo = nla_nest_start(skb, IFLA_PROTINFO); 5675 if (!protoinfo) 5676 goto nla_put_failure; 5677 5678 if (inet6_fill_ifla6_attrs(skb, idev, 0) < 0) 5679 goto nla_put_failure; 5680 5681 nla_nest_end(skb, protoinfo); 5682 nlmsg_end(skb, nlh); 5683 return 0; 5684 5685 nla_put_failure: 5686 nlmsg_cancel(skb, nlh); 5687 return -EMSGSIZE; 5688 } 5689 5690 static int inet6_valid_dump_ifinfo(const struct nlmsghdr *nlh, 5691 struct netlink_ext_ack *extack) 5692 { 5693 struct ifinfomsg *ifm; 5694 5695 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) { 5696 NL_SET_ERR_MSG_MOD(extack, "Invalid header for link dump request"); 5697 return -EINVAL; 5698 } 5699 5700 if (nlmsg_attrlen(nlh, sizeof(*ifm))) { 5701 NL_SET_ERR_MSG_MOD(extack, "Invalid data after header"); 5702 return -EINVAL; 5703 } 5704 5705 ifm = nlmsg_data(nlh); 5706 if (ifm->__ifi_pad || ifm->ifi_type || ifm->ifi_flags || 5707 ifm->ifi_change || ifm->ifi_index) { 5708 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for dump request"); 5709 return -EINVAL; 5710 } 5711 5712 return 0; 5713 } 5714 5715 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb) 5716 { 5717 struct net *net = sock_net(skb->sk); 5718 int h, s_h; 5719 int idx = 0, s_idx; 5720 struct net_device *dev; 5721 struct inet6_dev *idev; 5722 struct hlist_head *head; 5723 5724 /* only requests using strict checking can pass data to 5725 * influence the dump 5726 */ 5727 if (cb->strict_check) { 5728 int err = inet6_valid_dump_ifinfo(cb->nlh, cb->extack); 5729 5730 if (err < 0) 5731 return err; 5732 } 5733 5734 s_h = cb->args[0]; 5735 s_idx = cb->args[1]; 5736 5737 rcu_read_lock(); 5738 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 5739 idx = 0; 5740 head = &net->dev_index_head[h]; 5741 hlist_for_each_entry_rcu(dev, head, index_hlist) { 5742 if (idx < s_idx) 5743 goto cont; 5744 idev = __in6_dev_get(dev); 5745 if (!idev) 5746 goto cont; 5747 if (inet6_fill_ifinfo(skb, idev, 5748 NETLINK_CB(cb->skb).portid, 5749 cb->nlh->nlmsg_seq, 5750 RTM_NEWLINK, NLM_F_MULTI) < 0) 5751 goto out; 5752 cont: 5753 idx++; 5754 } 5755 } 5756 out: 5757 rcu_read_unlock(); 5758 cb->args[1] = idx; 5759 cb->args[0] = h; 5760 5761 return skb->len; 5762 } 5763 5764 void inet6_ifinfo_notify(int event, struct inet6_dev *idev) 5765 { 5766 struct sk_buff *skb; 5767 struct net *net = dev_net(idev->dev); 5768 int err = -ENOBUFS; 5769 5770 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC); 5771 if (!skb) 5772 goto errout; 5773 5774 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0); 5775 if (err < 0) { 5776 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */ 5777 WARN_ON(err == -EMSGSIZE); 5778 kfree_skb(skb); 5779 goto errout; 5780 } 5781 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC); 5782 return; 5783 errout: 5784 if (err < 0) 5785 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err); 5786 } 5787 5788 static inline size_t inet6_prefix_nlmsg_size(void) 5789 { 5790 return NLMSG_ALIGN(sizeof(struct prefixmsg)) 5791 + nla_total_size(sizeof(struct in6_addr)) 5792 + nla_total_size(sizeof(struct prefix_cacheinfo)); 5793 } 5794 5795 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev, 5796 struct prefix_info *pinfo, u32 portid, u32 seq, 5797 int event, unsigned int flags) 5798 { 5799 struct prefixmsg *pmsg; 5800 struct nlmsghdr *nlh; 5801 struct prefix_cacheinfo ci; 5802 5803 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags); 5804 if (!nlh) 5805 return -EMSGSIZE; 5806 5807 pmsg = nlmsg_data(nlh); 5808 pmsg->prefix_family = AF_INET6; 5809 pmsg->prefix_pad1 = 0; 5810 pmsg->prefix_pad2 = 0; 5811 pmsg->prefix_ifindex = idev->dev->ifindex; 5812 pmsg->prefix_len = pinfo->prefix_len; 5813 pmsg->prefix_type = pinfo->type; 5814 pmsg->prefix_pad3 = 0; 5815 pmsg->prefix_flags = 0; 5816 if (pinfo->onlink) 5817 pmsg->prefix_flags |= IF_PREFIX_ONLINK; 5818 if (pinfo->autoconf) 5819 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF; 5820 5821 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix)) 5822 goto nla_put_failure; 5823 ci.preferred_time = ntohl(pinfo->prefered); 5824 ci.valid_time = ntohl(pinfo->valid); 5825 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci)) 5826 goto nla_put_failure; 5827 nlmsg_end(skb, nlh); 5828 return 0; 5829 5830 nla_put_failure: 5831 nlmsg_cancel(skb, nlh); 5832 return -EMSGSIZE; 5833 } 5834 5835 static void inet6_prefix_notify(int event, struct inet6_dev *idev, 5836 struct prefix_info *pinfo) 5837 { 5838 struct sk_buff *skb; 5839 struct net *net = dev_net(idev->dev); 5840 int err = -ENOBUFS; 5841 5842 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC); 5843 if (!skb) 5844 goto errout; 5845 5846 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0); 5847 if (err < 0) { 5848 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */ 5849 WARN_ON(err == -EMSGSIZE); 5850 kfree_skb(skb); 5851 goto errout; 5852 } 5853 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC); 5854 return; 5855 errout: 5856 if (err < 0) 5857 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err); 5858 } 5859 5860 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 5861 { 5862 struct net *net = dev_net(ifp->idev->dev); 5863 5864 if (event) 5865 ASSERT_RTNL(); 5866 5867 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp); 5868 5869 switch (event) { 5870 case RTM_NEWADDR: 5871 /* 5872 * If the address was optimistic 5873 * we inserted the route at the start of 5874 * our DAD process, so we don't need 5875 * to do it again 5876 */ 5877 if (!rcu_access_pointer(ifp->rt->fib6_node)) 5878 ip6_ins_rt(net, ifp->rt); 5879 if (ifp->idev->cnf.forwarding) 5880 addrconf_join_anycast(ifp); 5881 if (!ipv6_addr_any(&ifp->peer_addr)) 5882 addrconf_prefix_route(&ifp->peer_addr, 128, 0, 5883 ifp->idev->dev, 0, 0, 5884 GFP_ATOMIC); 5885 break; 5886 case RTM_DELADDR: 5887 if (ifp->idev->cnf.forwarding) 5888 addrconf_leave_anycast(ifp); 5889 addrconf_leave_solict(ifp->idev, &ifp->addr); 5890 if (!ipv6_addr_any(&ifp->peer_addr)) { 5891 struct fib6_info *rt; 5892 5893 rt = addrconf_get_prefix_route(&ifp->peer_addr, 128, 5894 ifp->idev->dev, 0, 0); 5895 if (rt) 5896 ip6_del_rt(net, rt); 5897 } 5898 if (ifp->rt) { 5899 ip6_del_rt(net, ifp->rt); 5900 ifp->rt = NULL; 5901 } 5902 rt_genid_bump_ipv6(net); 5903 break; 5904 } 5905 atomic_inc(&net->ipv6.dev_addr_genid); 5906 } 5907 5908 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 5909 { 5910 rcu_read_lock_bh(); 5911 if (likely(ifp->idev->dead == 0)) 5912 __ipv6_ifa_notify(event, ifp); 5913 rcu_read_unlock_bh(); 5914 } 5915 5916 #ifdef CONFIG_SYSCTL 5917 5918 static 5919 int addrconf_sysctl_forward(struct ctl_table *ctl, int write, 5920 void __user *buffer, size_t *lenp, loff_t *ppos) 5921 { 5922 int *valp = ctl->data; 5923 int val = *valp; 5924 loff_t pos = *ppos; 5925 struct ctl_table lctl; 5926 int ret; 5927 5928 /* 5929 * ctl->data points to idev->cnf.forwarding, we should 5930 * not modify it until we get the rtnl lock. 5931 */ 5932 lctl = *ctl; 5933 lctl.data = &val; 5934 5935 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 5936 5937 if (write) 5938 ret = addrconf_fixup_forwarding(ctl, valp, val); 5939 if (ret) 5940 *ppos = pos; 5941 return ret; 5942 } 5943 5944 static 5945 int addrconf_sysctl_mtu(struct ctl_table *ctl, int write, 5946 void __user *buffer, size_t *lenp, loff_t *ppos) 5947 { 5948 struct inet6_dev *idev = ctl->extra1; 5949 int min_mtu = IPV6_MIN_MTU; 5950 struct ctl_table lctl; 5951 5952 lctl = *ctl; 5953 lctl.extra1 = &min_mtu; 5954 lctl.extra2 = idev ? &idev->dev->mtu : NULL; 5955 5956 return proc_dointvec_minmax(&lctl, write, buffer, lenp, ppos); 5957 } 5958 5959 static void dev_disable_change(struct inet6_dev *idev) 5960 { 5961 struct netdev_notifier_info info; 5962 5963 if (!idev || !idev->dev) 5964 return; 5965 5966 netdev_notifier_info_init(&info, idev->dev); 5967 if (idev->cnf.disable_ipv6) 5968 addrconf_notify(NULL, NETDEV_DOWN, &info); 5969 else 5970 addrconf_notify(NULL, NETDEV_UP, &info); 5971 } 5972 5973 static void addrconf_disable_change(struct net *net, __s32 newf) 5974 { 5975 struct net_device *dev; 5976 struct inet6_dev *idev; 5977 5978 for_each_netdev(net, dev) { 5979 idev = __in6_dev_get(dev); 5980 if (idev) { 5981 int changed = (!idev->cnf.disable_ipv6) ^ (!newf); 5982 idev->cnf.disable_ipv6 = newf; 5983 if (changed) 5984 dev_disable_change(idev); 5985 } 5986 } 5987 } 5988 5989 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf) 5990 { 5991 struct net *net; 5992 int old; 5993 5994 if (!rtnl_trylock()) 5995 return restart_syscall(); 5996 5997 net = (struct net *)table->extra2; 5998 old = *p; 5999 *p = newf; 6000 6001 if (p == &net->ipv6.devconf_dflt->disable_ipv6) { 6002 rtnl_unlock(); 6003 return 0; 6004 } 6005 6006 if (p == &net->ipv6.devconf_all->disable_ipv6) { 6007 net->ipv6.devconf_dflt->disable_ipv6 = newf; 6008 addrconf_disable_change(net, newf); 6009 } else if ((!newf) ^ (!old)) 6010 dev_disable_change((struct inet6_dev *)table->extra1); 6011 6012 rtnl_unlock(); 6013 return 0; 6014 } 6015 6016 static 6017 int addrconf_sysctl_disable(struct ctl_table *ctl, int write, 6018 void __user *buffer, size_t *lenp, loff_t *ppos) 6019 { 6020 int *valp = ctl->data; 6021 int val = *valp; 6022 loff_t pos = *ppos; 6023 struct ctl_table lctl; 6024 int ret; 6025 6026 /* 6027 * ctl->data points to idev->cnf.disable_ipv6, we should 6028 * not modify it until we get the rtnl lock. 6029 */ 6030 lctl = *ctl; 6031 lctl.data = &val; 6032 6033 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 6034 6035 if (write) 6036 ret = addrconf_disable_ipv6(ctl, valp, val); 6037 if (ret) 6038 *ppos = pos; 6039 return ret; 6040 } 6041 6042 static 6043 int addrconf_sysctl_proxy_ndp(struct ctl_table *ctl, int write, 6044 void __user *buffer, size_t *lenp, loff_t *ppos) 6045 { 6046 int *valp = ctl->data; 6047 int ret; 6048 int old, new; 6049 6050 old = *valp; 6051 ret = proc_dointvec(ctl, write, buffer, lenp, ppos); 6052 new = *valp; 6053 6054 if (write && old != new) { 6055 struct net *net = ctl->extra2; 6056 6057 if (!rtnl_trylock()) 6058 return restart_syscall(); 6059 6060 if (valp == &net->ipv6.devconf_dflt->proxy_ndp) 6061 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 6062 NETCONFA_PROXY_NEIGH, 6063 NETCONFA_IFINDEX_DEFAULT, 6064 net->ipv6.devconf_dflt); 6065 else if (valp == &net->ipv6.devconf_all->proxy_ndp) 6066 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 6067 NETCONFA_PROXY_NEIGH, 6068 NETCONFA_IFINDEX_ALL, 6069 net->ipv6.devconf_all); 6070 else { 6071 struct inet6_dev *idev = ctl->extra1; 6072 6073 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 6074 NETCONFA_PROXY_NEIGH, 6075 idev->dev->ifindex, 6076 &idev->cnf); 6077 } 6078 rtnl_unlock(); 6079 } 6080 6081 return ret; 6082 } 6083 6084 static int addrconf_sysctl_addr_gen_mode(struct ctl_table *ctl, int write, 6085 void __user *buffer, size_t *lenp, 6086 loff_t *ppos) 6087 { 6088 int ret = 0; 6089 u32 new_val; 6090 struct inet6_dev *idev = (struct inet6_dev *)ctl->extra1; 6091 struct net *net = (struct net *)ctl->extra2; 6092 struct ctl_table tmp = { 6093 .data = &new_val, 6094 .maxlen = sizeof(new_val), 6095 .mode = ctl->mode, 6096 }; 6097 6098 if (!rtnl_trylock()) 6099 return restart_syscall(); 6100 6101 new_val = *((u32 *)ctl->data); 6102 6103 ret = proc_douintvec(&tmp, write, buffer, lenp, ppos); 6104 if (ret != 0) 6105 goto out; 6106 6107 if (write) { 6108 if (check_addr_gen_mode(new_val) < 0) { 6109 ret = -EINVAL; 6110 goto out; 6111 } 6112 6113 if (idev) { 6114 if (check_stable_privacy(idev, net, new_val) < 0) { 6115 ret = -EINVAL; 6116 goto out; 6117 } 6118 6119 if (idev->cnf.addr_gen_mode != new_val) { 6120 idev->cnf.addr_gen_mode = new_val; 6121 addrconf_dev_config(idev->dev); 6122 } 6123 } else if (&net->ipv6.devconf_all->addr_gen_mode == ctl->data) { 6124 struct net_device *dev; 6125 6126 net->ipv6.devconf_dflt->addr_gen_mode = new_val; 6127 for_each_netdev(net, dev) { 6128 idev = __in6_dev_get(dev); 6129 if (idev && 6130 idev->cnf.addr_gen_mode != new_val) { 6131 idev->cnf.addr_gen_mode = new_val; 6132 addrconf_dev_config(idev->dev); 6133 } 6134 } 6135 } 6136 6137 *((u32 *)ctl->data) = new_val; 6138 } 6139 6140 out: 6141 rtnl_unlock(); 6142 6143 return ret; 6144 } 6145 6146 static int addrconf_sysctl_stable_secret(struct ctl_table *ctl, int write, 6147 void __user *buffer, size_t *lenp, 6148 loff_t *ppos) 6149 { 6150 int err; 6151 struct in6_addr addr; 6152 char str[IPV6_MAX_STRLEN]; 6153 struct ctl_table lctl = *ctl; 6154 struct net *net = ctl->extra2; 6155 struct ipv6_stable_secret *secret = ctl->data; 6156 6157 if (&net->ipv6.devconf_all->stable_secret == ctl->data) 6158 return -EIO; 6159 6160 lctl.maxlen = IPV6_MAX_STRLEN; 6161 lctl.data = str; 6162 6163 if (!rtnl_trylock()) 6164 return restart_syscall(); 6165 6166 if (!write && !secret->initialized) { 6167 err = -EIO; 6168 goto out; 6169 } 6170 6171 err = snprintf(str, sizeof(str), "%pI6", &secret->secret); 6172 if (err >= sizeof(str)) { 6173 err = -EIO; 6174 goto out; 6175 } 6176 6177 err = proc_dostring(&lctl, write, buffer, lenp, ppos); 6178 if (err || !write) 6179 goto out; 6180 6181 if (in6_pton(str, -1, addr.in6_u.u6_addr8, -1, NULL) != 1) { 6182 err = -EIO; 6183 goto out; 6184 } 6185 6186 secret->initialized = true; 6187 secret->secret = addr; 6188 6189 if (&net->ipv6.devconf_dflt->stable_secret == ctl->data) { 6190 struct net_device *dev; 6191 6192 for_each_netdev(net, dev) { 6193 struct inet6_dev *idev = __in6_dev_get(dev); 6194 6195 if (idev) { 6196 idev->cnf.addr_gen_mode = 6197 IN6_ADDR_GEN_MODE_STABLE_PRIVACY; 6198 } 6199 } 6200 } else { 6201 struct inet6_dev *idev = ctl->extra1; 6202 6203 idev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY; 6204 } 6205 6206 out: 6207 rtnl_unlock(); 6208 6209 return err; 6210 } 6211 6212 static 6213 int addrconf_sysctl_ignore_routes_with_linkdown(struct ctl_table *ctl, 6214 int write, 6215 void __user *buffer, 6216 size_t *lenp, 6217 loff_t *ppos) 6218 { 6219 int *valp = ctl->data; 6220 int val = *valp; 6221 loff_t pos = *ppos; 6222 struct ctl_table lctl; 6223 int ret; 6224 6225 /* ctl->data points to idev->cnf.ignore_routes_when_linkdown 6226 * we should not modify it until we get the rtnl lock. 6227 */ 6228 lctl = *ctl; 6229 lctl.data = &val; 6230 6231 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 6232 6233 if (write) 6234 ret = addrconf_fixup_linkdown(ctl, valp, val); 6235 if (ret) 6236 *ppos = pos; 6237 return ret; 6238 } 6239 6240 static 6241 void addrconf_set_nopolicy(struct rt6_info *rt, int action) 6242 { 6243 if (rt) { 6244 if (action) 6245 rt->dst.flags |= DST_NOPOLICY; 6246 else 6247 rt->dst.flags &= ~DST_NOPOLICY; 6248 } 6249 } 6250 6251 static 6252 void addrconf_disable_policy_idev(struct inet6_dev *idev, int val) 6253 { 6254 struct inet6_ifaddr *ifa; 6255 6256 read_lock_bh(&idev->lock); 6257 list_for_each_entry(ifa, &idev->addr_list, if_list) { 6258 spin_lock(&ifa->lock); 6259 if (ifa->rt) { 6260 struct fib6_info *rt = ifa->rt; 6261 int cpu; 6262 6263 rcu_read_lock(); 6264 ifa->rt->dst_nopolicy = val ? true : false; 6265 if (rt->rt6i_pcpu) { 6266 for_each_possible_cpu(cpu) { 6267 struct rt6_info **rtp; 6268 6269 rtp = per_cpu_ptr(rt->rt6i_pcpu, cpu); 6270 addrconf_set_nopolicy(*rtp, val); 6271 } 6272 } 6273 rcu_read_unlock(); 6274 } 6275 spin_unlock(&ifa->lock); 6276 } 6277 read_unlock_bh(&idev->lock); 6278 } 6279 6280 static 6281 int addrconf_disable_policy(struct ctl_table *ctl, int *valp, int val) 6282 { 6283 struct inet6_dev *idev; 6284 struct net *net; 6285 6286 if (!rtnl_trylock()) 6287 return restart_syscall(); 6288 6289 *valp = val; 6290 6291 net = (struct net *)ctl->extra2; 6292 if (valp == &net->ipv6.devconf_dflt->disable_policy) { 6293 rtnl_unlock(); 6294 return 0; 6295 } 6296 6297 if (valp == &net->ipv6.devconf_all->disable_policy) { 6298 struct net_device *dev; 6299 6300 for_each_netdev(net, dev) { 6301 idev = __in6_dev_get(dev); 6302 if (idev) 6303 addrconf_disable_policy_idev(idev, val); 6304 } 6305 } else { 6306 idev = (struct inet6_dev *)ctl->extra1; 6307 addrconf_disable_policy_idev(idev, val); 6308 } 6309 6310 rtnl_unlock(); 6311 return 0; 6312 } 6313 6314 static 6315 int addrconf_sysctl_disable_policy(struct ctl_table *ctl, int write, 6316 void __user *buffer, size_t *lenp, 6317 loff_t *ppos) 6318 { 6319 int *valp = ctl->data; 6320 int val = *valp; 6321 loff_t pos = *ppos; 6322 struct ctl_table lctl; 6323 int ret; 6324 6325 lctl = *ctl; 6326 lctl.data = &val; 6327 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 6328 6329 if (write && (*valp != val)) 6330 ret = addrconf_disable_policy(ctl, valp, val); 6331 6332 if (ret) 6333 *ppos = pos; 6334 6335 return ret; 6336 } 6337 6338 static int minus_one = -1; 6339 static const int zero = 0; 6340 static const int one = 1; 6341 static const int two_five_five = 255; 6342 6343 static const struct ctl_table addrconf_sysctl[] = { 6344 { 6345 .procname = "forwarding", 6346 .data = &ipv6_devconf.forwarding, 6347 .maxlen = sizeof(int), 6348 .mode = 0644, 6349 .proc_handler = addrconf_sysctl_forward, 6350 }, 6351 { 6352 .procname = "hop_limit", 6353 .data = &ipv6_devconf.hop_limit, 6354 .maxlen = sizeof(int), 6355 .mode = 0644, 6356 .proc_handler = proc_dointvec_minmax, 6357 .extra1 = (void *)&one, 6358 .extra2 = (void *)&two_five_five, 6359 }, 6360 { 6361 .procname = "mtu", 6362 .data = &ipv6_devconf.mtu6, 6363 .maxlen = sizeof(int), 6364 .mode = 0644, 6365 .proc_handler = addrconf_sysctl_mtu, 6366 }, 6367 { 6368 .procname = "accept_ra", 6369 .data = &ipv6_devconf.accept_ra, 6370 .maxlen = sizeof(int), 6371 .mode = 0644, 6372 .proc_handler = proc_dointvec, 6373 }, 6374 { 6375 .procname = "accept_redirects", 6376 .data = &ipv6_devconf.accept_redirects, 6377 .maxlen = sizeof(int), 6378 .mode = 0644, 6379 .proc_handler = proc_dointvec, 6380 }, 6381 { 6382 .procname = "autoconf", 6383 .data = &ipv6_devconf.autoconf, 6384 .maxlen = sizeof(int), 6385 .mode = 0644, 6386 .proc_handler = proc_dointvec, 6387 }, 6388 { 6389 .procname = "dad_transmits", 6390 .data = &ipv6_devconf.dad_transmits, 6391 .maxlen = sizeof(int), 6392 .mode = 0644, 6393 .proc_handler = proc_dointvec, 6394 }, 6395 { 6396 .procname = "router_solicitations", 6397 .data = &ipv6_devconf.rtr_solicits, 6398 .maxlen = sizeof(int), 6399 .mode = 0644, 6400 .proc_handler = proc_dointvec_minmax, 6401 .extra1 = &minus_one, 6402 }, 6403 { 6404 .procname = "router_solicitation_interval", 6405 .data = &ipv6_devconf.rtr_solicit_interval, 6406 .maxlen = sizeof(int), 6407 .mode = 0644, 6408 .proc_handler = proc_dointvec_jiffies, 6409 }, 6410 { 6411 .procname = "router_solicitation_max_interval", 6412 .data = &ipv6_devconf.rtr_solicit_max_interval, 6413 .maxlen = sizeof(int), 6414 .mode = 0644, 6415 .proc_handler = proc_dointvec_jiffies, 6416 }, 6417 { 6418 .procname = "router_solicitation_delay", 6419 .data = &ipv6_devconf.rtr_solicit_delay, 6420 .maxlen = sizeof(int), 6421 .mode = 0644, 6422 .proc_handler = proc_dointvec_jiffies, 6423 }, 6424 { 6425 .procname = "force_mld_version", 6426 .data = &ipv6_devconf.force_mld_version, 6427 .maxlen = sizeof(int), 6428 .mode = 0644, 6429 .proc_handler = proc_dointvec, 6430 }, 6431 { 6432 .procname = "mldv1_unsolicited_report_interval", 6433 .data = 6434 &ipv6_devconf.mldv1_unsolicited_report_interval, 6435 .maxlen = sizeof(int), 6436 .mode = 0644, 6437 .proc_handler = proc_dointvec_ms_jiffies, 6438 }, 6439 { 6440 .procname = "mldv2_unsolicited_report_interval", 6441 .data = 6442 &ipv6_devconf.mldv2_unsolicited_report_interval, 6443 .maxlen = sizeof(int), 6444 .mode = 0644, 6445 .proc_handler = proc_dointvec_ms_jiffies, 6446 }, 6447 { 6448 .procname = "use_tempaddr", 6449 .data = &ipv6_devconf.use_tempaddr, 6450 .maxlen = sizeof(int), 6451 .mode = 0644, 6452 .proc_handler = proc_dointvec, 6453 }, 6454 { 6455 .procname = "temp_valid_lft", 6456 .data = &ipv6_devconf.temp_valid_lft, 6457 .maxlen = sizeof(int), 6458 .mode = 0644, 6459 .proc_handler = proc_dointvec, 6460 }, 6461 { 6462 .procname = "temp_prefered_lft", 6463 .data = &ipv6_devconf.temp_prefered_lft, 6464 .maxlen = sizeof(int), 6465 .mode = 0644, 6466 .proc_handler = proc_dointvec, 6467 }, 6468 { 6469 .procname = "regen_max_retry", 6470 .data = &ipv6_devconf.regen_max_retry, 6471 .maxlen = sizeof(int), 6472 .mode = 0644, 6473 .proc_handler = proc_dointvec, 6474 }, 6475 { 6476 .procname = "max_desync_factor", 6477 .data = &ipv6_devconf.max_desync_factor, 6478 .maxlen = sizeof(int), 6479 .mode = 0644, 6480 .proc_handler = proc_dointvec, 6481 }, 6482 { 6483 .procname = "max_addresses", 6484 .data = &ipv6_devconf.max_addresses, 6485 .maxlen = sizeof(int), 6486 .mode = 0644, 6487 .proc_handler = proc_dointvec, 6488 }, 6489 { 6490 .procname = "accept_ra_defrtr", 6491 .data = &ipv6_devconf.accept_ra_defrtr, 6492 .maxlen = sizeof(int), 6493 .mode = 0644, 6494 .proc_handler = proc_dointvec, 6495 }, 6496 { 6497 .procname = "accept_ra_min_hop_limit", 6498 .data = &ipv6_devconf.accept_ra_min_hop_limit, 6499 .maxlen = sizeof(int), 6500 .mode = 0644, 6501 .proc_handler = proc_dointvec, 6502 }, 6503 { 6504 .procname = "accept_ra_pinfo", 6505 .data = &ipv6_devconf.accept_ra_pinfo, 6506 .maxlen = sizeof(int), 6507 .mode = 0644, 6508 .proc_handler = proc_dointvec, 6509 }, 6510 #ifdef CONFIG_IPV6_ROUTER_PREF 6511 { 6512 .procname = "accept_ra_rtr_pref", 6513 .data = &ipv6_devconf.accept_ra_rtr_pref, 6514 .maxlen = sizeof(int), 6515 .mode = 0644, 6516 .proc_handler = proc_dointvec, 6517 }, 6518 { 6519 .procname = "router_probe_interval", 6520 .data = &ipv6_devconf.rtr_probe_interval, 6521 .maxlen = sizeof(int), 6522 .mode = 0644, 6523 .proc_handler = proc_dointvec_jiffies, 6524 }, 6525 #ifdef CONFIG_IPV6_ROUTE_INFO 6526 { 6527 .procname = "accept_ra_rt_info_min_plen", 6528 .data = &ipv6_devconf.accept_ra_rt_info_min_plen, 6529 .maxlen = sizeof(int), 6530 .mode = 0644, 6531 .proc_handler = proc_dointvec, 6532 }, 6533 { 6534 .procname = "accept_ra_rt_info_max_plen", 6535 .data = &ipv6_devconf.accept_ra_rt_info_max_plen, 6536 .maxlen = sizeof(int), 6537 .mode = 0644, 6538 .proc_handler = proc_dointvec, 6539 }, 6540 #endif 6541 #endif 6542 { 6543 .procname = "proxy_ndp", 6544 .data = &ipv6_devconf.proxy_ndp, 6545 .maxlen = sizeof(int), 6546 .mode = 0644, 6547 .proc_handler = addrconf_sysctl_proxy_ndp, 6548 }, 6549 { 6550 .procname = "accept_source_route", 6551 .data = &ipv6_devconf.accept_source_route, 6552 .maxlen = sizeof(int), 6553 .mode = 0644, 6554 .proc_handler = proc_dointvec, 6555 }, 6556 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 6557 { 6558 .procname = "optimistic_dad", 6559 .data = &ipv6_devconf.optimistic_dad, 6560 .maxlen = sizeof(int), 6561 .mode = 0644, 6562 .proc_handler = proc_dointvec, 6563 }, 6564 { 6565 .procname = "use_optimistic", 6566 .data = &ipv6_devconf.use_optimistic, 6567 .maxlen = sizeof(int), 6568 .mode = 0644, 6569 .proc_handler = proc_dointvec, 6570 }, 6571 #endif 6572 #ifdef CONFIG_IPV6_MROUTE 6573 { 6574 .procname = "mc_forwarding", 6575 .data = &ipv6_devconf.mc_forwarding, 6576 .maxlen = sizeof(int), 6577 .mode = 0444, 6578 .proc_handler = proc_dointvec, 6579 }, 6580 #endif 6581 { 6582 .procname = "disable_ipv6", 6583 .data = &ipv6_devconf.disable_ipv6, 6584 .maxlen = sizeof(int), 6585 .mode = 0644, 6586 .proc_handler = addrconf_sysctl_disable, 6587 }, 6588 { 6589 .procname = "accept_dad", 6590 .data = &ipv6_devconf.accept_dad, 6591 .maxlen = sizeof(int), 6592 .mode = 0644, 6593 .proc_handler = proc_dointvec, 6594 }, 6595 { 6596 .procname = "force_tllao", 6597 .data = &ipv6_devconf.force_tllao, 6598 .maxlen = sizeof(int), 6599 .mode = 0644, 6600 .proc_handler = proc_dointvec 6601 }, 6602 { 6603 .procname = "ndisc_notify", 6604 .data = &ipv6_devconf.ndisc_notify, 6605 .maxlen = sizeof(int), 6606 .mode = 0644, 6607 .proc_handler = proc_dointvec 6608 }, 6609 { 6610 .procname = "suppress_frag_ndisc", 6611 .data = &ipv6_devconf.suppress_frag_ndisc, 6612 .maxlen = sizeof(int), 6613 .mode = 0644, 6614 .proc_handler = proc_dointvec 6615 }, 6616 { 6617 .procname = "accept_ra_from_local", 6618 .data = &ipv6_devconf.accept_ra_from_local, 6619 .maxlen = sizeof(int), 6620 .mode = 0644, 6621 .proc_handler = proc_dointvec, 6622 }, 6623 { 6624 .procname = "accept_ra_mtu", 6625 .data = &ipv6_devconf.accept_ra_mtu, 6626 .maxlen = sizeof(int), 6627 .mode = 0644, 6628 .proc_handler = proc_dointvec, 6629 }, 6630 { 6631 .procname = "stable_secret", 6632 .data = &ipv6_devconf.stable_secret, 6633 .maxlen = IPV6_MAX_STRLEN, 6634 .mode = 0600, 6635 .proc_handler = addrconf_sysctl_stable_secret, 6636 }, 6637 { 6638 .procname = "use_oif_addrs_only", 6639 .data = &ipv6_devconf.use_oif_addrs_only, 6640 .maxlen = sizeof(int), 6641 .mode = 0644, 6642 .proc_handler = proc_dointvec, 6643 }, 6644 { 6645 .procname = "ignore_routes_with_linkdown", 6646 .data = &ipv6_devconf.ignore_routes_with_linkdown, 6647 .maxlen = sizeof(int), 6648 .mode = 0644, 6649 .proc_handler = addrconf_sysctl_ignore_routes_with_linkdown, 6650 }, 6651 { 6652 .procname = "drop_unicast_in_l2_multicast", 6653 .data = &ipv6_devconf.drop_unicast_in_l2_multicast, 6654 .maxlen = sizeof(int), 6655 .mode = 0644, 6656 .proc_handler = proc_dointvec, 6657 }, 6658 { 6659 .procname = "drop_unsolicited_na", 6660 .data = &ipv6_devconf.drop_unsolicited_na, 6661 .maxlen = sizeof(int), 6662 .mode = 0644, 6663 .proc_handler = proc_dointvec, 6664 }, 6665 { 6666 .procname = "keep_addr_on_down", 6667 .data = &ipv6_devconf.keep_addr_on_down, 6668 .maxlen = sizeof(int), 6669 .mode = 0644, 6670 .proc_handler = proc_dointvec, 6671 6672 }, 6673 { 6674 .procname = "seg6_enabled", 6675 .data = &ipv6_devconf.seg6_enabled, 6676 .maxlen = sizeof(int), 6677 .mode = 0644, 6678 .proc_handler = proc_dointvec, 6679 }, 6680 #ifdef CONFIG_IPV6_SEG6_HMAC 6681 { 6682 .procname = "seg6_require_hmac", 6683 .data = &ipv6_devconf.seg6_require_hmac, 6684 .maxlen = sizeof(int), 6685 .mode = 0644, 6686 .proc_handler = proc_dointvec, 6687 }, 6688 #endif 6689 { 6690 .procname = "enhanced_dad", 6691 .data = &ipv6_devconf.enhanced_dad, 6692 .maxlen = sizeof(int), 6693 .mode = 0644, 6694 .proc_handler = proc_dointvec, 6695 }, 6696 { 6697 .procname = "addr_gen_mode", 6698 .data = &ipv6_devconf.addr_gen_mode, 6699 .maxlen = sizeof(int), 6700 .mode = 0644, 6701 .proc_handler = addrconf_sysctl_addr_gen_mode, 6702 }, 6703 { 6704 .procname = "disable_policy", 6705 .data = &ipv6_devconf.disable_policy, 6706 .maxlen = sizeof(int), 6707 .mode = 0644, 6708 .proc_handler = addrconf_sysctl_disable_policy, 6709 }, 6710 { 6711 .procname = "ndisc_tclass", 6712 .data = &ipv6_devconf.ndisc_tclass, 6713 .maxlen = sizeof(int), 6714 .mode = 0644, 6715 .proc_handler = proc_dointvec_minmax, 6716 .extra1 = (void *)&zero, 6717 .extra2 = (void *)&two_five_five, 6718 }, 6719 { 6720 /* sentinel */ 6721 } 6722 }; 6723 6724 static int __addrconf_sysctl_register(struct net *net, char *dev_name, 6725 struct inet6_dev *idev, struct ipv6_devconf *p) 6726 { 6727 int i, ifindex; 6728 struct ctl_table *table; 6729 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ]; 6730 6731 table = kmemdup(addrconf_sysctl, sizeof(addrconf_sysctl), GFP_KERNEL); 6732 if (!table) 6733 goto out; 6734 6735 for (i = 0; table[i].data; i++) { 6736 table[i].data += (char *)p - (char *)&ipv6_devconf; 6737 /* If one of these is already set, then it is not safe to 6738 * overwrite either of them: this makes proc_dointvec_minmax 6739 * usable. 6740 */ 6741 if (!table[i].extra1 && !table[i].extra2) { 6742 table[i].extra1 = idev; /* embedded; no ref */ 6743 table[i].extra2 = net; 6744 } 6745 } 6746 6747 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name); 6748 6749 p->sysctl_header = register_net_sysctl(net, path, table); 6750 if (!p->sysctl_header) 6751 goto free; 6752 6753 if (!strcmp(dev_name, "all")) 6754 ifindex = NETCONFA_IFINDEX_ALL; 6755 else if (!strcmp(dev_name, "default")) 6756 ifindex = NETCONFA_IFINDEX_DEFAULT; 6757 else 6758 ifindex = idev->dev->ifindex; 6759 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, NETCONFA_ALL, 6760 ifindex, p); 6761 return 0; 6762 6763 free: 6764 kfree(table); 6765 out: 6766 return -ENOBUFS; 6767 } 6768 6769 static void __addrconf_sysctl_unregister(struct net *net, 6770 struct ipv6_devconf *p, int ifindex) 6771 { 6772 struct ctl_table *table; 6773 6774 if (!p->sysctl_header) 6775 return; 6776 6777 table = p->sysctl_header->ctl_table_arg; 6778 unregister_net_sysctl_table(p->sysctl_header); 6779 p->sysctl_header = NULL; 6780 kfree(table); 6781 6782 inet6_netconf_notify_devconf(net, RTM_DELNETCONF, 0, ifindex, NULL); 6783 } 6784 6785 static int addrconf_sysctl_register(struct inet6_dev *idev) 6786 { 6787 int err; 6788 6789 if (!sysctl_dev_name_is_allowed(idev->dev->name)) 6790 return -EINVAL; 6791 6792 err = neigh_sysctl_register(idev->dev, idev->nd_parms, 6793 &ndisc_ifinfo_sysctl_change); 6794 if (err) 6795 return err; 6796 err = __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name, 6797 idev, &idev->cnf); 6798 if (err) 6799 neigh_sysctl_unregister(idev->nd_parms); 6800 6801 return err; 6802 } 6803 6804 static void addrconf_sysctl_unregister(struct inet6_dev *idev) 6805 { 6806 __addrconf_sysctl_unregister(dev_net(idev->dev), &idev->cnf, 6807 idev->dev->ifindex); 6808 neigh_sysctl_unregister(idev->nd_parms); 6809 } 6810 6811 6812 #endif 6813 6814 static int __net_init addrconf_init_net(struct net *net) 6815 { 6816 int err = -ENOMEM; 6817 struct ipv6_devconf *all, *dflt; 6818 6819 all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL); 6820 if (!all) 6821 goto err_alloc_all; 6822 6823 dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL); 6824 if (!dflt) 6825 goto err_alloc_dflt; 6826 6827 /* these will be inherited by all namespaces */ 6828 dflt->autoconf = ipv6_defaults.autoconf; 6829 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6; 6830 6831 dflt->stable_secret.initialized = false; 6832 all->stable_secret.initialized = false; 6833 6834 net->ipv6.devconf_all = all; 6835 net->ipv6.devconf_dflt = dflt; 6836 6837 #ifdef CONFIG_SYSCTL 6838 err = __addrconf_sysctl_register(net, "all", NULL, all); 6839 if (err < 0) 6840 goto err_reg_all; 6841 6842 err = __addrconf_sysctl_register(net, "default", NULL, dflt); 6843 if (err < 0) 6844 goto err_reg_dflt; 6845 #endif 6846 return 0; 6847 6848 #ifdef CONFIG_SYSCTL 6849 err_reg_dflt: 6850 __addrconf_sysctl_unregister(net, all, NETCONFA_IFINDEX_ALL); 6851 err_reg_all: 6852 kfree(dflt); 6853 #endif 6854 err_alloc_dflt: 6855 kfree(all); 6856 err_alloc_all: 6857 return err; 6858 } 6859 6860 static void __net_exit addrconf_exit_net(struct net *net) 6861 { 6862 #ifdef CONFIG_SYSCTL 6863 __addrconf_sysctl_unregister(net, net->ipv6.devconf_dflt, 6864 NETCONFA_IFINDEX_DEFAULT); 6865 __addrconf_sysctl_unregister(net, net->ipv6.devconf_all, 6866 NETCONFA_IFINDEX_ALL); 6867 #endif 6868 kfree(net->ipv6.devconf_dflt); 6869 kfree(net->ipv6.devconf_all); 6870 } 6871 6872 static struct pernet_operations addrconf_ops = { 6873 .init = addrconf_init_net, 6874 .exit = addrconf_exit_net, 6875 }; 6876 6877 static struct rtnl_af_ops inet6_ops __read_mostly = { 6878 .family = AF_INET6, 6879 .fill_link_af = inet6_fill_link_af, 6880 .get_link_af_size = inet6_get_link_af_size, 6881 .validate_link_af = inet6_validate_link_af, 6882 .set_link_af = inet6_set_link_af, 6883 }; 6884 6885 /* 6886 * Init / cleanup code 6887 */ 6888 6889 int __init addrconf_init(void) 6890 { 6891 struct inet6_dev *idev; 6892 int i, err; 6893 6894 err = ipv6_addr_label_init(); 6895 if (err < 0) { 6896 pr_crit("%s: cannot initialize default policy table: %d\n", 6897 __func__, err); 6898 goto out; 6899 } 6900 6901 err = register_pernet_subsys(&addrconf_ops); 6902 if (err < 0) 6903 goto out_addrlabel; 6904 6905 addrconf_wq = create_workqueue("ipv6_addrconf"); 6906 if (!addrconf_wq) { 6907 err = -ENOMEM; 6908 goto out_nowq; 6909 } 6910 6911 /* The addrconf netdev notifier requires that loopback_dev 6912 * has it's ipv6 private information allocated and setup 6913 * before it can bring up and give link-local addresses 6914 * to other devices which are up. 6915 * 6916 * Unfortunately, loopback_dev is not necessarily the first 6917 * entry in the global dev_base list of net devices. In fact, 6918 * it is likely to be the very last entry on that list. 6919 * So this causes the notifier registry below to try and 6920 * give link-local addresses to all devices besides loopback_dev 6921 * first, then loopback_dev, which cases all the non-loopback_dev 6922 * devices to fail to get a link-local address. 6923 * 6924 * So, as a temporary fix, allocate the ipv6 structure for 6925 * loopback_dev first by hand. 6926 * Longer term, all of the dependencies ipv6 has upon the loopback 6927 * device and it being up should be removed. 6928 */ 6929 rtnl_lock(); 6930 idev = ipv6_add_dev(init_net.loopback_dev); 6931 rtnl_unlock(); 6932 if (IS_ERR(idev)) { 6933 err = PTR_ERR(idev); 6934 goto errlo; 6935 } 6936 6937 ip6_route_init_special_entries(); 6938 6939 for (i = 0; i < IN6_ADDR_HSIZE; i++) 6940 INIT_HLIST_HEAD(&inet6_addr_lst[i]); 6941 6942 register_netdevice_notifier(&ipv6_dev_notf); 6943 6944 addrconf_verify(); 6945 6946 rtnl_af_register(&inet6_ops); 6947 6948 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETLINK, 6949 NULL, inet6_dump_ifinfo, 0); 6950 if (err < 0) 6951 goto errout; 6952 6953 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_NEWADDR, 6954 inet6_rtm_newaddr, NULL, 0); 6955 if (err < 0) 6956 goto errout; 6957 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_DELADDR, 6958 inet6_rtm_deladdr, NULL, 0); 6959 if (err < 0) 6960 goto errout; 6961 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETADDR, 6962 inet6_rtm_getaddr, inet6_dump_ifaddr, 6963 RTNL_FLAG_DOIT_UNLOCKED); 6964 if (err < 0) 6965 goto errout; 6966 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETMULTICAST, 6967 NULL, inet6_dump_ifmcaddr, 0); 6968 if (err < 0) 6969 goto errout; 6970 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETANYCAST, 6971 NULL, inet6_dump_ifacaddr, 0); 6972 if (err < 0) 6973 goto errout; 6974 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETNETCONF, 6975 inet6_netconf_get_devconf, 6976 inet6_netconf_dump_devconf, 6977 RTNL_FLAG_DOIT_UNLOCKED); 6978 if (err < 0) 6979 goto errout; 6980 err = ipv6_addr_label_rtnl_register(); 6981 if (err < 0) 6982 goto errout; 6983 6984 return 0; 6985 errout: 6986 rtnl_unregister_all(PF_INET6); 6987 rtnl_af_unregister(&inet6_ops); 6988 unregister_netdevice_notifier(&ipv6_dev_notf); 6989 errlo: 6990 destroy_workqueue(addrconf_wq); 6991 out_nowq: 6992 unregister_pernet_subsys(&addrconf_ops); 6993 out_addrlabel: 6994 ipv6_addr_label_cleanup(); 6995 out: 6996 return err; 6997 } 6998 6999 void addrconf_cleanup(void) 7000 { 7001 struct net_device *dev; 7002 int i; 7003 7004 unregister_netdevice_notifier(&ipv6_dev_notf); 7005 unregister_pernet_subsys(&addrconf_ops); 7006 ipv6_addr_label_cleanup(); 7007 7008 rtnl_af_unregister(&inet6_ops); 7009 7010 rtnl_lock(); 7011 7012 /* clean dev list */ 7013 for_each_netdev(&init_net, dev) { 7014 if (__in6_dev_get(dev) == NULL) 7015 continue; 7016 addrconf_ifdown(dev, 1); 7017 } 7018 addrconf_ifdown(init_net.loopback_dev, 2); 7019 7020 /* 7021 * Check hash table. 7022 */ 7023 spin_lock_bh(&addrconf_hash_lock); 7024 for (i = 0; i < IN6_ADDR_HSIZE; i++) 7025 WARN_ON(!hlist_empty(&inet6_addr_lst[i])); 7026 spin_unlock_bh(&addrconf_hash_lock); 7027 cancel_delayed_work(&addr_chk_work); 7028 rtnl_unlock(); 7029 7030 destroy_workqueue(addrconf_wq); 7031 } 7032