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