1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * IPv6 Address [auto]configuration 4 * Linux INET6 implementation 5 * 6 * Authors: 7 * Pedro Roque <roque@di.fc.ul.pt> 8 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru> 9 */ 10 11 /* 12 * Changes: 13 * 14 * Janos Farkas : delete timer on ifdown 15 * <chexum@bankinf.banki.hu> 16 * Andi Kleen : kill double kfree on module 17 * unload. 18 * Maciej W. Rozycki : FDDI support 19 * sekiya@USAGI : Don't send too many RS 20 * packets. 21 * yoshfuji@USAGI : Fixed interval between DAD 22 * packets. 23 * YOSHIFUJI Hideaki @USAGI : improved accuracy of 24 * address validation timer. 25 * YOSHIFUJI Hideaki @USAGI : Privacy Extensions (RFC3041) 26 * support. 27 * Yuji SEKIYA @USAGI : Don't assign a same IPv6 28 * address on a same interface. 29 * YOSHIFUJI Hideaki @USAGI : ARCnet support 30 * YOSHIFUJI Hideaki @USAGI : convert /proc/net/if_inet6 to 31 * seq_file. 32 * YOSHIFUJI Hideaki @USAGI : improved source address 33 * selection; consider scope, 34 * status etc. 35 */ 36 37 #define pr_fmt(fmt) "IPv6: " fmt 38 39 #include <linux/errno.h> 40 #include <linux/types.h> 41 #include <linux/kernel.h> 42 #include <linux/sched/signal.h> 43 #include <linux/socket.h> 44 #include <linux/sockios.h> 45 #include <linux/net.h> 46 #include <linux/inet.h> 47 #include <linux/in6.h> 48 #include <linux/netdevice.h> 49 #include <linux/if_addr.h> 50 #include <linux/if_arp.h> 51 #include <linux/if_arcnet.h> 52 #include <linux/if_infiniband.h> 53 #include <linux/route.h> 54 #include <linux/inetdevice.h> 55 #include <linux/init.h> 56 #include <linux/slab.h> 57 #ifdef CONFIG_SYSCTL 58 #include <linux/sysctl.h> 59 #endif 60 #include <linux/capability.h> 61 #include <linux/delay.h> 62 #include <linux/notifier.h> 63 #include <linux/string.h> 64 #include <linux/hash.h> 65 66 #include <net/net_namespace.h> 67 #include <net/sock.h> 68 #include <net/snmp.h> 69 70 #include <net/6lowpan.h> 71 #include <net/firewire.h> 72 #include <net/ipv6.h> 73 #include <net/protocol.h> 74 #include <net/ndisc.h> 75 #include <net/ip6_route.h> 76 #include <net/addrconf.h> 77 #include <net/tcp.h> 78 #include <net/ip.h> 79 #include <net/netlink.h> 80 #include <net/pkt_sched.h> 81 #include <net/l3mdev.h> 82 #include <linux/if_tunnel.h> 83 #include <linux/rtnetlink.h> 84 #include <linux/netconf.h> 85 #include <linux/random.h> 86 #include <linux/uaccess.h> 87 #include <asm/unaligned.h> 88 89 #include <linux/proc_fs.h> 90 #include <linux/seq_file.h> 91 #include <linux/export.h> 92 93 #define INFINITY_LIFE_TIME 0xFFFFFFFF 94 95 #define IPV6_MAX_STRLEN \ 96 sizeof("ffff:ffff:ffff:ffff:ffff:ffff:255.255.255.255") 97 98 static inline u32 cstamp_delta(unsigned long cstamp) 99 { 100 return (cstamp - INITIAL_JIFFIES) * 100UL / HZ; 101 } 102 103 static inline s32 rfc3315_s14_backoff_init(s32 irt) 104 { 105 /* multiply 'initial retransmission time' by 0.9 .. 1.1 */ 106 u64 tmp = (900000 + prandom_u32() % 200001) * (u64)irt; 107 do_div(tmp, 1000000); 108 return (s32)tmp; 109 } 110 111 static inline s32 rfc3315_s14_backoff_update(s32 rt, s32 mrt) 112 { 113 /* multiply 'retransmission timeout' by 1.9 .. 2.1 */ 114 u64 tmp = (1900000 + prandom_u32() % 200001) * (u64)rt; 115 do_div(tmp, 1000000); 116 if ((s32)tmp > mrt) { 117 /* multiply 'maximum retransmission time' by 0.9 .. 1.1 */ 118 tmp = (900000 + prandom_u32() % 200001) * (u64)mrt; 119 do_div(tmp, 1000000); 120 } 121 return (s32)tmp; 122 } 123 124 #ifdef CONFIG_SYSCTL 125 static int addrconf_sysctl_register(struct inet6_dev *idev); 126 static void addrconf_sysctl_unregister(struct inet6_dev *idev); 127 #else 128 static inline int addrconf_sysctl_register(struct inet6_dev *idev) 129 { 130 return 0; 131 } 132 133 static inline void addrconf_sysctl_unregister(struct inet6_dev *idev) 134 { 135 } 136 #endif 137 138 static void ipv6_regen_rndid(struct inet6_dev *idev); 139 static void ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr); 140 141 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev); 142 static int ipv6_count_addresses(const struct inet6_dev *idev); 143 static int ipv6_generate_stable_address(struct in6_addr *addr, 144 u8 dad_count, 145 const struct inet6_dev *idev); 146 147 #define IN6_ADDR_HSIZE_SHIFT 8 148 #define IN6_ADDR_HSIZE (1 << IN6_ADDR_HSIZE_SHIFT) 149 /* 150 * Configured unicast address hash table 151 */ 152 static struct hlist_head inet6_addr_lst[IN6_ADDR_HSIZE]; 153 static DEFINE_SPINLOCK(addrconf_hash_lock); 154 155 static void addrconf_verify(void); 156 static void addrconf_verify_rtnl(void); 157 static void addrconf_verify_work(struct work_struct *); 158 159 static struct workqueue_struct *addrconf_wq; 160 static DECLARE_DELAYED_WORK(addr_chk_work, addrconf_verify_work); 161 162 static void addrconf_join_anycast(struct inet6_ifaddr *ifp); 163 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp); 164 165 static void addrconf_type_change(struct net_device *dev, 166 unsigned long event); 167 static int addrconf_ifdown(struct net_device *dev, int how); 168 169 static struct fib6_info *addrconf_get_prefix_route(const struct in6_addr *pfx, 170 int plen, 171 const struct net_device *dev, 172 u32 flags, u32 noflags, 173 bool no_gw); 174 175 static void addrconf_dad_start(struct inet6_ifaddr *ifp); 176 static void addrconf_dad_work(struct work_struct *w); 177 static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id, 178 bool send_na); 179 static void addrconf_dad_run(struct inet6_dev *idev, bool restart); 180 static void addrconf_rs_timer(struct timer_list *t); 181 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa); 182 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa); 183 184 static void inet6_prefix_notify(int event, struct inet6_dev *idev, 185 struct prefix_info *pinfo); 186 187 static struct ipv6_devconf ipv6_devconf __read_mostly = { 188 .forwarding = 0, 189 .hop_limit = IPV6_DEFAULT_HOPLIMIT, 190 .mtu6 = IPV6_MIN_MTU, 191 .accept_ra = 1, 192 .accept_redirects = 1, 193 .autoconf = 1, 194 .force_mld_version = 0, 195 .mldv1_unsolicited_report_interval = 10 * HZ, 196 .mldv2_unsolicited_report_interval = HZ, 197 .dad_transmits = 1, 198 .rtr_solicits = MAX_RTR_SOLICITATIONS, 199 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL, 200 .rtr_solicit_max_interval = RTR_SOLICITATION_MAX_INTERVAL, 201 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY, 202 .use_tempaddr = 0, 203 .temp_valid_lft = TEMP_VALID_LIFETIME, 204 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME, 205 .regen_max_retry = REGEN_MAX_RETRY, 206 .max_desync_factor = MAX_DESYNC_FACTOR, 207 .max_addresses = IPV6_MAX_ADDRESSES, 208 .accept_ra_defrtr = 1, 209 .accept_ra_from_local = 0, 210 .accept_ra_min_hop_limit= 1, 211 .accept_ra_pinfo = 1, 212 #ifdef CONFIG_IPV6_ROUTER_PREF 213 .accept_ra_rtr_pref = 1, 214 .rtr_probe_interval = 60 * HZ, 215 #ifdef CONFIG_IPV6_ROUTE_INFO 216 .accept_ra_rt_info_min_plen = 0, 217 .accept_ra_rt_info_max_plen = 0, 218 #endif 219 #endif 220 .proxy_ndp = 0, 221 .accept_source_route = 0, /* we do not accept RH0 by default. */ 222 .disable_ipv6 = 0, 223 .accept_dad = 0, 224 .suppress_frag_ndisc = 1, 225 .accept_ra_mtu = 1, 226 .stable_secret = { 227 .initialized = false, 228 }, 229 .use_oif_addrs_only = 0, 230 .ignore_routes_with_linkdown = 0, 231 .keep_addr_on_down = 0, 232 .seg6_enabled = 0, 233 #ifdef CONFIG_IPV6_SEG6_HMAC 234 .seg6_require_hmac = 0, 235 #endif 236 .enhanced_dad = 1, 237 .addr_gen_mode = IN6_ADDR_GEN_MODE_EUI64, 238 .disable_policy = 0, 239 }; 240 241 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = { 242 .forwarding = 0, 243 .hop_limit = IPV6_DEFAULT_HOPLIMIT, 244 .mtu6 = IPV6_MIN_MTU, 245 .accept_ra = 1, 246 .accept_redirects = 1, 247 .autoconf = 1, 248 .force_mld_version = 0, 249 .mldv1_unsolicited_report_interval = 10 * HZ, 250 .mldv2_unsolicited_report_interval = HZ, 251 .dad_transmits = 1, 252 .rtr_solicits = MAX_RTR_SOLICITATIONS, 253 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL, 254 .rtr_solicit_max_interval = RTR_SOLICITATION_MAX_INTERVAL, 255 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY, 256 .use_tempaddr = 0, 257 .temp_valid_lft = TEMP_VALID_LIFETIME, 258 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME, 259 .regen_max_retry = REGEN_MAX_RETRY, 260 .max_desync_factor = MAX_DESYNC_FACTOR, 261 .max_addresses = IPV6_MAX_ADDRESSES, 262 .accept_ra_defrtr = 1, 263 .accept_ra_from_local = 0, 264 .accept_ra_min_hop_limit= 1, 265 .accept_ra_pinfo = 1, 266 #ifdef CONFIG_IPV6_ROUTER_PREF 267 .accept_ra_rtr_pref = 1, 268 .rtr_probe_interval = 60 * HZ, 269 #ifdef CONFIG_IPV6_ROUTE_INFO 270 .accept_ra_rt_info_min_plen = 0, 271 .accept_ra_rt_info_max_plen = 0, 272 #endif 273 #endif 274 .proxy_ndp = 0, 275 .accept_source_route = 0, /* we do not accept RH0 by default. */ 276 .disable_ipv6 = 0, 277 .accept_dad = 1, 278 .suppress_frag_ndisc = 1, 279 .accept_ra_mtu = 1, 280 .stable_secret = { 281 .initialized = false, 282 }, 283 .use_oif_addrs_only = 0, 284 .ignore_routes_with_linkdown = 0, 285 .keep_addr_on_down = 0, 286 .seg6_enabled = 0, 287 #ifdef CONFIG_IPV6_SEG6_HMAC 288 .seg6_require_hmac = 0, 289 #endif 290 .enhanced_dad = 1, 291 .addr_gen_mode = IN6_ADDR_GEN_MODE_EUI64, 292 .disable_policy = 0, 293 }; 294 295 /* Check if link is ready: is it up and is a valid qdisc available */ 296 static inline bool addrconf_link_ready(const struct net_device *dev) 297 { 298 return netif_oper_up(dev) && !qdisc_tx_is_noop(dev); 299 } 300 301 static void addrconf_del_rs_timer(struct inet6_dev *idev) 302 { 303 if (del_timer(&idev->rs_timer)) 304 __in6_dev_put(idev); 305 } 306 307 static void addrconf_del_dad_work(struct inet6_ifaddr *ifp) 308 { 309 if (cancel_delayed_work(&ifp->dad_work)) 310 __in6_ifa_put(ifp); 311 } 312 313 static void addrconf_mod_rs_timer(struct inet6_dev *idev, 314 unsigned long when) 315 { 316 if (!timer_pending(&idev->rs_timer)) 317 in6_dev_hold(idev); 318 mod_timer(&idev->rs_timer, jiffies + when); 319 } 320 321 static void addrconf_mod_dad_work(struct inet6_ifaddr *ifp, 322 unsigned long delay) 323 { 324 in6_ifa_hold(ifp); 325 if (mod_delayed_work(addrconf_wq, &ifp->dad_work, delay)) 326 in6_ifa_put(ifp); 327 } 328 329 static int snmp6_alloc_dev(struct inet6_dev *idev) 330 { 331 int i; 332 333 idev->stats.ipv6 = alloc_percpu(struct ipstats_mib); 334 if (!idev->stats.ipv6) 335 goto err_ip; 336 337 for_each_possible_cpu(i) { 338 struct ipstats_mib *addrconf_stats; 339 addrconf_stats = per_cpu_ptr(idev->stats.ipv6, i); 340 u64_stats_init(&addrconf_stats->syncp); 341 } 342 343 344 idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device), 345 GFP_KERNEL); 346 if (!idev->stats.icmpv6dev) 347 goto err_icmp; 348 idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device), 349 GFP_KERNEL); 350 if (!idev->stats.icmpv6msgdev) 351 goto err_icmpmsg; 352 353 return 0; 354 355 err_icmpmsg: 356 kfree(idev->stats.icmpv6dev); 357 err_icmp: 358 free_percpu(idev->stats.ipv6); 359 err_ip: 360 return -ENOMEM; 361 } 362 363 static struct inet6_dev *ipv6_add_dev(struct net_device *dev) 364 { 365 struct inet6_dev *ndev; 366 int err = -ENOMEM; 367 368 ASSERT_RTNL(); 369 370 if (dev->mtu < IPV6_MIN_MTU) 371 return ERR_PTR(-EINVAL); 372 373 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL); 374 if (!ndev) 375 return ERR_PTR(err); 376 377 rwlock_init(&ndev->lock); 378 ndev->dev = dev; 379 INIT_LIST_HEAD(&ndev->addr_list); 380 timer_setup(&ndev->rs_timer, addrconf_rs_timer, 0); 381 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf)); 382 383 if (ndev->cnf.stable_secret.initialized) 384 ndev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY; 385 386 ndev->cnf.mtu6 = dev->mtu; 387 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl); 388 if (!ndev->nd_parms) { 389 kfree(ndev); 390 return ERR_PTR(err); 391 } 392 if (ndev->cnf.forwarding) 393 dev_disable_lro(dev); 394 /* We refer to the device */ 395 dev_hold(dev); 396 397 if (snmp6_alloc_dev(ndev) < 0) { 398 netdev_dbg(dev, "%s: cannot allocate memory for statistics\n", 399 __func__); 400 neigh_parms_release(&nd_tbl, ndev->nd_parms); 401 dev_put(dev); 402 kfree(ndev); 403 return ERR_PTR(err); 404 } 405 406 if (snmp6_register_dev(ndev) < 0) { 407 netdev_dbg(dev, "%s: cannot create /proc/net/dev_snmp6/%s\n", 408 __func__, dev->name); 409 goto err_release; 410 } 411 412 /* One reference from device. */ 413 refcount_set(&ndev->refcnt, 1); 414 415 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK)) 416 ndev->cnf.accept_dad = -1; 417 418 #if IS_ENABLED(CONFIG_IPV6_SIT) 419 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) { 420 pr_info("%s: Disabled Multicast RS\n", dev->name); 421 ndev->cnf.rtr_solicits = 0; 422 } 423 #endif 424 425 INIT_LIST_HEAD(&ndev->tempaddr_list); 426 ndev->desync_factor = U32_MAX; 427 if ((dev->flags&IFF_LOOPBACK) || 428 dev->type == ARPHRD_TUNNEL || 429 dev->type == ARPHRD_TUNNEL6 || 430 dev->type == ARPHRD_SIT || 431 dev->type == ARPHRD_NONE) { 432 ndev->cnf.use_tempaddr = -1; 433 } else 434 ipv6_regen_rndid(ndev); 435 436 ndev->token = in6addr_any; 437 438 if (netif_running(dev) && addrconf_link_ready(dev)) 439 ndev->if_flags |= IF_READY; 440 441 ipv6_mc_init_dev(ndev); 442 ndev->tstamp = jiffies; 443 err = addrconf_sysctl_register(ndev); 444 if (err) { 445 ipv6_mc_destroy_dev(ndev); 446 snmp6_unregister_dev(ndev); 447 goto err_release; 448 } 449 /* protected by rtnl_lock */ 450 rcu_assign_pointer(dev->ip6_ptr, ndev); 451 452 /* Join interface-local all-node multicast group */ 453 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allnodes); 454 455 /* Join all-node multicast group */ 456 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes); 457 458 /* Join all-router multicast group if forwarding is set */ 459 if (ndev->cnf.forwarding && (dev->flags & IFF_MULTICAST)) 460 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters); 461 462 return ndev; 463 464 err_release: 465 neigh_parms_release(&nd_tbl, ndev->nd_parms); 466 ndev->dead = 1; 467 in6_dev_finish_destroy(ndev); 468 return ERR_PTR(err); 469 } 470 471 static struct inet6_dev *ipv6_find_idev(struct net_device *dev) 472 { 473 struct inet6_dev *idev; 474 475 ASSERT_RTNL(); 476 477 idev = __in6_dev_get(dev); 478 if (!idev) { 479 idev = ipv6_add_dev(dev); 480 if (IS_ERR(idev)) 481 return idev; 482 } 483 484 if (dev->flags&IFF_UP) 485 ipv6_mc_up(idev); 486 return idev; 487 } 488 489 static int inet6_netconf_msgsize_devconf(int type) 490 { 491 int size = NLMSG_ALIGN(sizeof(struct netconfmsg)) 492 + nla_total_size(4); /* NETCONFA_IFINDEX */ 493 bool all = false; 494 495 if (type == NETCONFA_ALL) 496 all = true; 497 498 if (all || type == NETCONFA_FORWARDING) 499 size += nla_total_size(4); 500 #ifdef CONFIG_IPV6_MROUTE 501 if (all || type == NETCONFA_MC_FORWARDING) 502 size += nla_total_size(4); 503 #endif 504 if (all || type == NETCONFA_PROXY_NEIGH) 505 size += nla_total_size(4); 506 507 if (all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN) 508 size += nla_total_size(4); 509 510 return size; 511 } 512 513 static int inet6_netconf_fill_devconf(struct sk_buff *skb, int ifindex, 514 struct ipv6_devconf *devconf, u32 portid, 515 u32 seq, int event, unsigned int flags, 516 int type) 517 { 518 struct nlmsghdr *nlh; 519 struct netconfmsg *ncm; 520 bool all = false; 521 522 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg), 523 flags); 524 if (!nlh) 525 return -EMSGSIZE; 526 527 if (type == NETCONFA_ALL) 528 all = true; 529 530 ncm = nlmsg_data(nlh); 531 ncm->ncm_family = AF_INET6; 532 533 if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0) 534 goto nla_put_failure; 535 536 if (!devconf) 537 goto out; 538 539 if ((all || type == NETCONFA_FORWARDING) && 540 nla_put_s32(skb, NETCONFA_FORWARDING, devconf->forwarding) < 0) 541 goto nla_put_failure; 542 #ifdef CONFIG_IPV6_MROUTE 543 if ((all || type == NETCONFA_MC_FORWARDING) && 544 nla_put_s32(skb, NETCONFA_MC_FORWARDING, 545 devconf->mc_forwarding) < 0) 546 goto nla_put_failure; 547 #endif 548 if ((all || type == NETCONFA_PROXY_NEIGH) && 549 nla_put_s32(skb, NETCONFA_PROXY_NEIGH, devconf->proxy_ndp) < 0) 550 goto nla_put_failure; 551 552 if ((all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN) && 553 nla_put_s32(skb, NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN, 554 devconf->ignore_routes_with_linkdown) < 0) 555 goto nla_put_failure; 556 557 out: 558 nlmsg_end(skb, nlh); 559 return 0; 560 561 nla_put_failure: 562 nlmsg_cancel(skb, nlh); 563 return -EMSGSIZE; 564 } 565 566 void inet6_netconf_notify_devconf(struct net *net, int event, int type, 567 int ifindex, struct ipv6_devconf *devconf) 568 { 569 struct sk_buff *skb; 570 int err = -ENOBUFS; 571 572 skb = nlmsg_new(inet6_netconf_msgsize_devconf(type), GFP_KERNEL); 573 if (!skb) 574 goto errout; 575 576 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 0, 0, 577 event, 0, type); 578 if (err < 0) { 579 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */ 580 WARN_ON(err == -EMSGSIZE); 581 kfree_skb(skb); 582 goto errout; 583 } 584 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_NETCONF, NULL, GFP_KERNEL); 585 return; 586 errout: 587 rtnl_set_sk_err(net, RTNLGRP_IPV6_NETCONF, err); 588 } 589 590 static const struct nla_policy devconf_ipv6_policy[NETCONFA_MAX+1] = { 591 [NETCONFA_IFINDEX] = { .len = sizeof(int) }, 592 [NETCONFA_FORWARDING] = { .len = sizeof(int) }, 593 [NETCONFA_PROXY_NEIGH] = { .len = sizeof(int) }, 594 [NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN] = { .len = sizeof(int) }, 595 }; 596 597 static int inet6_netconf_valid_get_req(struct sk_buff *skb, 598 const struct nlmsghdr *nlh, 599 struct nlattr **tb, 600 struct netlink_ext_ack *extack) 601 { 602 int i, err; 603 604 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(struct netconfmsg))) { 605 NL_SET_ERR_MSG_MOD(extack, "Invalid header for netconf get request"); 606 return -EINVAL; 607 } 608 609 if (!netlink_strict_get_check(skb)) 610 return nlmsg_parse_deprecated(nlh, sizeof(struct netconfmsg), 611 tb, NETCONFA_MAX, 612 devconf_ipv6_policy, extack); 613 614 err = nlmsg_parse_deprecated_strict(nlh, sizeof(struct netconfmsg), 615 tb, NETCONFA_MAX, 616 devconf_ipv6_policy, extack); 617 if (err) 618 return err; 619 620 for (i = 0; i <= NETCONFA_MAX; i++) { 621 if (!tb[i]) 622 continue; 623 624 switch (i) { 625 case NETCONFA_IFINDEX: 626 break; 627 default: 628 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in netconf get request"); 629 return -EINVAL; 630 } 631 } 632 633 return 0; 634 } 635 636 static int inet6_netconf_get_devconf(struct sk_buff *in_skb, 637 struct nlmsghdr *nlh, 638 struct netlink_ext_ack *extack) 639 { 640 struct net *net = sock_net(in_skb->sk); 641 struct nlattr *tb[NETCONFA_MAX+1]; 642 struct inet6_dev *in6_dev = NULL; 643 struct net_device *dev = NULL; 644 struct sk_buff *skb; 645 struct ipv6_devconf *devconf; 646 int ifindex; 647 int err; 648 649 err = inet6_netconf_valid_get_req(in_skb, nlh, tb, extack); 650 if (err < 0) 651 return err; 652 653 if (!tb[NETCONFA_IFINDEX]) 654 return -EINVAL; 655 656 err = -EINVAL; 657 ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]); 658 switch (ifindex) { 659 case NETCONFA_IFINDEX_ALL: 660 devconf = net->ipv6.devconf_all; 661 break; 662 case NETCONFA_IFINDEX_DEFAULT: 663 devconf = net->ipv6.devconf_dflt; 664 break; 665 default: 666 dev = dev_get_by_index(net, ifindex); 667 if (!dev) 668 return -EINVAL; 669 in6_dev = in6_dev_get(dev); 670 if (!in6_dev) 671 goto errout; 672 devconf = &in6_dev->cnf; 673 break; 674 } 675 676 err = -ENOBUFS; 677 skb = nlmsg_new(inet6_netconf_msgsize_devconf(NETCONFA_ALL), GFP_KERNEL); 678 if (!skb) 679 goto errout; 680 681 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 682 NETLINK_CB(in_skb).portid, 683 nlh->nlmsg_seq, RTM_NEWNETCONF, 0, 684 NETCONFA_ALL); 685 if (err < 0) { 686 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */ 687 WARN_ON(err == -EMSGSIZE); 688 kfree_skb(skb); 689 goto errout; 690 } 691 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid); 692 errout: 693 if (in6_dev) 694 in6_dev_put(in6_dev); 695 if (dev) 696 dev_put(dev); 697 return err; 698 } 699 700 static int inet6_netconf_dump_devconf(struct sk_buff *skb, 701 struct netlink_callback *cb) 702 { 703 const struct nlmsghdr *nlh = cb->nlh; 704 struct net *net = sock_net(skb->sk); 705 int h, s_h; 706 int idx, s_idx; 707 struct net_device *dev; 708 struct inet6_dev *idev; 709 struct hlist_head *head; 710 711 if (cb->strict_check) { 712 struct netlink_ext_ack *extack = cb->extack; 713 struct netconfmsg *ncm; 714 715 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ncm))) { 716 NL_SET_ERR_MSG_MOD(extack, "Invalid header for netconf dump request"); 717 return -EINVAL; 718 } 719 720 if (nlmsg_attrlen(nlh, sizeof(*ncm))) { 721 NL_SET_ERR_MSG_MOD(extack, "Invalid data after header in netconf dump request"); 722 return -EINVAL; 723 } 724 } 725 726 s_h = cb->args[0]; 727 s_idx = idx = cb->args[1]; 728 729 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 730 idx = 0; 731 head = &net->dev_index_head[h]; 732 rcu_read_lock(); 733 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ 734 net->dev_base_seq; 735 hlist_for_each_entry_rcu(dev, head, index_hlist) { 736 if (idx < s_idx) 737 goto cont; 738 idev = __in6_dev_get(dev); 739 if (!idev) 740 goto cont; 741 742 if (inet6_netconf_fill_devconf(skb, dev->ifindex, 743 &idev->cnf, 744 NETLINK_CB(cb->skb).portid, 745 nlh->nlmsg_seq, 746 RTM_NEWNETCONF, 747 NLM_F_MULTI, 748 NETCONFA_ALL) < 0) { 749 rcu_read_unlock(); 750 goto done; 751 } 752 nl_dump_check_consistent(cb, nlmsg_hdr(skb)); 753 cont: 754 idx++; 755 } 756 rcu_read_unlock(); 757 } 758 if (h == NETDEV_HASHENTRIES) { 759 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL, 760 net->ipv6.devconf_all, 761 NETLINK_CB(cb->skb).portid, 762 nlh->nlmsg_seq, 763 RTM_NEWNETCONF, NLM_F_MULTI, 764 NETCONFA_ALL) < 0) 765 goto done; 766 else 767 h++; 768 } 769 if (h == NETDEV_HASHENTRIES + 1) { 770 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT, 771 net->ipv6.devconf_dflt, 772 NETLINK_CB(cb->skb).portid, 773 nlh->nlmsg_seq, 774 RTM_NEWNETCONF, NLM_F_MULTI, 775 NETCONFA_ALL) < 0) 776 goto done; 777 else 778 h++; 779 } 780 done: 781 cb->args[0] = h; 782 cb->args[1] = idx; 783 784 return skb->len; 785 } 786 787 #ifdef CONFIG_SYSCTL 788 static void dev_forward_change(struct inet6_dev *idev) 789 { 790 struct net_device *dev; 791 struct inet6_ifaddr *ifa; 792 793 if (!idev) 794 return; 795 dev = idev->dev; 796 if (idev->cnf.forwarding) 797 dev_disable_lro(dev); 798 if (dev->flags & IFF_MULTICAST) { 799 if (idev->cnf.forwarding) { 800 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters); 801 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allrouters); 802 ipv6_dev_mc_inc(dev, &in6addr_sitelocal_allrouters); 803 } else { 804 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters); 805 ipv6_dev_mc_dec(dev, &in6addr_interfacelocal_allrouters); 806 ipv6_dev_mc_dec(dev, &in6addr_sitelocal_allrouters); 807 } 808 } 809 810 list_for_each_entry(ifa, &idev->addr_list, if_list) { 811 if (ifa->flags&IFA_F_TENTATIVE) 812 continue; 813 if (idev->cnf.forwarding) 814 addrconf_join_anycast(ifa); 815 else 816 addrconf_leave_anycast(ifa); 817 } 818 inet6_netconf_notify_devconf(dev_net(dev), RTM_NEWNETCONF, 819 NETCONFA_FORWARDING, 820 dev->ifindex, &idev->cnf); 821 } 822 823 824 static void addrconf_forward_change(struct net *net, __s32 newf) 825 { 826 struct net_device *dev; 827 struct inet6_dev *idev; 828 829 for_each_netdev(net, dev) { 830 idev = __in6_dev_get(dev); 831 if (idev) { 832 int changed = (!idev->cnf.forwarding) ^ (!newf); 833 idev->cnf.forwarding = newf; 834 if (changed) 835 dev_forward_change(idev); 836 } 837 } 838 } 839 840 static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf) 841 { 842 struct net *net; 843 int old; 844 845 if (!rtnl_trylock()) 846 return restart_syscall(); 847 848 net = (struct net *)table->extra2; 849 old = *p; 850 *p = newf; 851 852 if (p == &net->ipv6.devconf_dflt->forwarding) { 853 if ((!newf) ^ (!old)) 854 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 855 NETCONFA_FORWARDING, 856 NETCONFA_IFINDEX_DEFAULT, 857 net->ipv6.devconf_dflt); 858 rtnl_unlock(); 859 return 0; 860 } 861 862 if (p == &net->ipv6.devconf_all->forwarding) { 863 int old_dflt = net->ipv6.devconf_dflt->forwarding; 864 865 net->ipv6.devconf_dflt->forwarding = newf; 866 if ((!newf) ^ (!old_dflt)) 867 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 868 NETCONFA_FORWARDING, 869 NETCONFA_IFINDEX_DEFAULT, 870 net->ipv6.devconf_dflt); 871 872 addrconf_forward_change(net, newf); 873 if ((!newf) ^ (!old)) 874 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 875 NETCONFA_FORWARDING, 876 NETCONFA_IFINDEX_ALL, 877 net->ipv6.devconf_all); 878 } else if ((!newf) ^ (!old)) 879 dev_forward_change((struct inet6_dev *)table->extra1); 880 rtnl_unlock(); 881 882 if (newf) 883 rt6_purge_dflt_routers(net); 884 return 1; 885 } 886 887 static void addrconf_linkdown_change(struct net *net, __s32 newf) 888 { 889 struct net_device *dev; 890 struct inet6_dev *idev; 891 892 for_each_netdev(net, dev) { 893 idev = __in6_dev_get(dev); 894 if (idev) { 895 int changed = (!idev->cnf.ignore_routes_with_linkdown) ^ (!newf); 896 897 idev->cnf.ignore_routes_with_linkdown = newf; 898 if (changed) 899 inet6_netconf_notify_devconf(dev_net(dev), 900 RTM_NEWNETCONF, 901 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN, 902 dev->ifindex, 903 &idev->cnf); 904 } 905 } 906 } 907 908 static int addrconf_fixup_linkdown(struct ctl_table *table, int *p, int newf) 909 { 910 struct net *net; 911 int old; 912 913 if (!rtnl_trylock()) 914 return restart_syscall(); 915 916 net = (struct net *)table->extra2; 917 old = *p; 918 *p = newf; 919 920 if (p == &net->ipv6.devconf_dflt->ignore_routes_with_linkdown) { 921 if ((!newf) ^ (!old)) 922 inet6_netconf_notify_devconf(net, 923 RTM_NEWNETCONF, 924 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN, 925 NETCONFA_IFINDEX_DEFAULT, 926 net->ipv6.devconf_dflt); 927 rtnl_unlock(); 928 return 0; 929 } 930 931 if (p == &net->ipv6.devconf_all->ignore_routes_with_linkdown) { 932 net->ipv6.devconf_dflt->ignore_routes_with_linkdown = newf; 933 addrconf_linkdown_change(net, newf); 934 if ((!newf) ^ (!old)) 935 inet6_netconf_notify_devconf(net, 936 RTM_NEWNETCONF, 937 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN, 938 NETCONFA_IFINDEX_ALL, 939 net->ipv6.devconf_all); 940 } 941 rtnl_unlock(); 942 943 return 1; 944 } 945 946 #endif 947 948 /* Nobody refers to this ifaddr, destroy it */ 949 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp) 950 { 951 WARN_ON(!hlist_unhashed(&ifp->addr_lst)); 952 953 #ifdef NET_REFCNT_DEBUG 954 pr_debug("%s\n", __func__); 955 #endif 956 957 in6_dev_put(ifp->idev); 958 959 if (cancel_delayed_work(&ifp->dad_work)) 960 pr_notice("delayed DAD work was pending while freeing ifa=%p\n", 961 ifp); 962 963 if (ifp->state != INET6_IFADDR_STATE_DEAD) { 964 pr_warn("Freeing alive inet6 address %p\n", ifp); 965 return; 966 } 967 968 kfree_rcu(ifp, rcu); 969 } 970 971 static void 972 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp) 973 { 974 struct list_head *p; 975 int ifp_scope = ipv6_addr_src_scope(&ifp->addr); 976 977 /* 978 * Each device address list is sorted in order of scope - 979 * global before linklocal. 980 */ 981 list_for_each(p, &idev->addr_list) { 982 struct inet6_ifaddr *ifa 983 = list_entry(p, struct inet6_ifaddr, if_list); 984 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr)) 985 break; 986 } 987 988 list_add_tail_rcu(&ifp->if_list, p); 989 } 990 991 static u32 inet6_addr_hash(const struct net *net, const struct in6_addr *addr) 992 { 993 u32 val = ipv6_addr_hash(addr) ^ net_hash_mix(net); 994 995 return hash_32(val, IN6_ADDR_HSIZE_SHIFT); 996 } 997 998 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr, 999 struct net_device *dev, unsigned int hash) 1000 { 1001 struct inet6_ifaddr *ifp; 1002 1003 hlist_for_each_entry(ifp, &inet6_addr_lst[hash], addr_lst) { 1004 if (!net_eq(dev_net(ifp->idev->dev), net)) 1005 continue; 1006 if (ipv6_addr_equal(&ifp->addr, addr)) { 1007 if (!dev || ifp->idev->dev == dev) 1008 return true; 1009 } 1010 } 1011 return false; 1012 } 1013 1014 static int ipv6_add_addr_hash(struct net_device *dev, struct inet6_ifaddr *ifa) 1015 { 1016 unsigned int hash = inet6_addr_hash(dev_net(dev), &ifa->addr); 1017 int err = 0; 1018 1019 spin_lock(&addrconf_hash_lock); 1020 1021 /* Ignore adding duplicate addresses on an interface */ 1022 if (ipv6_chk_same_addr(dev_net(dev), &ifa->addr, dev, hash)) { 1023 netdev_dbg(dev, "ipv6_add_addr: already assigned\n"); 1024 err = -EEXIST; 1025 } else { 1026 hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]); 1027 } 1028 1029 spin_unlock(&addrconf_hash_lock); 1030 1031 return err; 1032 } 1033 1034 /* On success it returns ifp with increased reference count */ 1035 1036 static struct inet6_ifaddr * 1037 ipv6_add_addr(struct inet6_dev *idev, struct ifa6_config *cfg, 1038 bool can_block, struct netlink_ext_ack *extack) 1039 { 1040 gfp_t gfp_flags = can_block ? GFP_KERNEL : GFP_ATOMIC; 1041 int addr_type = ipv6_addr_type(cfg->pfx); 1042 struct net *net = dev_net(idev->dev); 1043 struct inet6_ifaddr *ifa = NULL; 1044 struct fib6_info *f6i = NULL; 1045 int err = 0; 1046 1047 if (addr_type == IPV6_ADDR_ANY || 1048 (addr_type & IPV6_ADDR_MULTICAST && 1049 !(cfg->ifa_flags & IFA_F_MCAUTOJOIN)) || 1050 (!(idev->dev->flags & IFF_LOOPBACK) && 1051 !netif_is_l3_master(idev->dev) && 1052 addr_type & IPV6_ADDR_LOOPBACK)) 1053 return ERR_PTR(-EADDRNOTAVAIL); 1054 1055 if (idev->dead) { 1056 err = -ENODEV; /*XXX*/ 1057 goto out; 1058 } 1059 1060 if (idev->cnf.disable_ipv6) { 1061 err = -EACCES; 1062 goto out; 1063 } 1064 1065 /* validator notifier needs to be blocking; 1066 * do not call in atomic context 1067 */ 1068 if (can_block) { 1069 struct in6_validator_info i6vi = { 1070 .i6vi_addr = *cfg->pfx, 1071 .i6vi_dev = idev, 1072 .extack = extack, 1073 }; 1074 1075 err = inet6addr_validator_notifier_call_chain(NETDEV_UP, &i6vi); 1076 err = notifier_to_errno(err); 1077 if (err < 0) 1078 goto out; 1079 } 1080 1081 ifa = kzalloc(sizeof(*ifa), gfp_flags); 1082 if (!ifa) { 1083 err = -ENOBUFS; 1084 goto out; 1085 } 1086 1087 f6i = addrconf_f6i_alloc(net, idev, cfg->pfx, false, gfp_flags); 1088 if (IS_ERR(f6i)) { 1089 err = PTR_ERR(f6i); 1090 f6i = NULL; 1091 goto out; 1092 } 1093 1094 if (net->ipv6.devconf_all->disable_policy || 1095 idev->cnf.disable_policy) 1096 f6i->dst_nopolicy = true; 1097 1098 neigh_parms_data_state_setall(idev->nd_parms); 1099 1100 ifa->addr = *cfg->pfx; 1101 if (cfg->peer_pfx) 1102 ifa->peer_addr = *cfg->peer_pfx; 1103 1104 spin_lock_init(&ifa->lock); 1105 INIT_DELAYED_WORK(&ifa->dad_work, addrconf_dad_work); 1106 INIT_HLIST_NODE(&ifa->addr_lst); 1107 ifa->scope = cfg->scope; 1108 ifa->prefix_len = cfg->plen; 1109 ifa->rt_priority = cfg->rt_priority; 1110 ifa->flags = cfg->ifa_flags; 1111 /* No need to add the TENTATIVE flag for addresses with NODAD */ 1112 if (!(cfg->ifa_flags & IFA_F_NODAD)) 1113 ifa->flags |= IFA_F_TENTATIVE; 1114 ifa->valid_lft = cfg->valid_lft; 1115 ifa->prefered_lft = cfg->preferred_lft; 1116 ifa->cstamp = ifa->tstamp = jiffies; 1117 ifa->tokenized = false; 1118 1119 ifa->rt = f6i; 1120 1121 ifa->idev = idev; 1122 in6_dev_hold(idev); 1123 1124 /* For caller */ 1125 refcount_set(&ifa->refcnt, 1); 1126 1127 rcu_read_lock_bh(); 1128 1129 err = ipv6_add_addr_hash(idev->dev, ifa); 1130 if (err < 0) { 1131 rcu_read_unlock_bh(); 1132 goto out; 1133 } 1134 1135 write_lock(&idev->lock); 1136 1137 /* Add to inet6_dev unicast addr list. */ 1138 ipv6_link_dev_addr(idev, ifa); 1139 1140 if (ifa->flags&IFA_F_TEMPORARY) { 1141 list_add(&ifa->tmp_list, &idev->tempaddr_list); 1142 in6_ifa_hold(ifa); 1143 } 1144 1145 in6_ifa_hold(ifa); 1146 write_unlock(&idev->lock); 1147 1148 rcu_read_unlock_bh(); 1149 1150 inet6addr_notifier_call_chain(NETDEV_UP, ifa); 1151 out: 1152 if (unlikely(err < 0)) { 1153 fib6_info_release(f6i); 1154 1155 if (ifa) { 1156 if (ifa->idev) 1157 in6_dev_put(ifa->idev); 1158 kfree(ifa); 1159 } 1160 ifa = ERR_PTR(err); 1161 } 1162 1163 return ifa; 1164 } 1165 1166 enum cleanup_prefix_rt_t { 1167 CLEANUP_PREFIX_RT_NOP, /* no cleanup action for prefix route */ 1168 CLEANUP_PREFIX_RT_DEL, /* delete the prefix route */ 1169 CLEANUP_PREFIX_RT_EXPIRE, /* update the lifetime of the prefix route */ 1170 }; 1171 1172 /* 1173 * Check, whether the prefix for ifp would still need a prefix route 1174 * after deleting ifp. The function returns one of the CLEANUP_PREFIX_RT_* 1175 * constants. 1176 * 1177 * 1) we don't purge prefix if address was not permanent. 1178 * prefix is managed by its own lifetime. 1179 * 2) we also don't purge, if the address was IFA_F_NOPREFIXROUTE. 1180 * 3) if there are no addresses, delete prefix. 1181 * 4) if there are still other permanent address(es), 1182 * corresponding prefix is still permanent. 1183 * 5) if there are still other addresses with IFA_F_NOPREFIXROUTE, 1184 * don't purge the prefix, assume user space is managing it. 1185 * 6) otherwise, update prefix lifetime to the 1186 * longest valid lifetime among the corresponding 1187 * addresses on the device. 1188 * Note: subsequent RA will update lifetime. 1189 **/ 1190 static enum cleanup_prefix_rt_t 1191 check_cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long *expires) 1192 { 1193 struct inet6_ifaddr *ifa; 1194 struct inet6_dev *idev = ifp->idev; 1195 unsigned long lifetime; 1196 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_DEL; 1197 1198 *expires = jiffies; 1199 1200 list_for_each_entry(ifa, &idev->addr_list, if_list) { 1201 if (ifa == ifp) 1202 continue; 1203 if (ifa->prefix_len != ifp->prefix_len || 1204 !ipv6_prefix_equal(&ifa->addr, &ifp->addr, 1205 ifp->prefix_len)) 1206 continue; 1207 if (ifa->flags & (IFA_F_PERMANENT | IFA_F_NOPREFIXROUTE)) 1208 return CLEANUP_PREFIX_RT_NOP; 1209 1210 action = CLEANUP_PREFIX_RT_EXPIRE; 1211 1212 spin_lock(&ifa->lock); 1213 1214 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ); 1215 /* 1216 * Note: Because this address is 1217 * not permanent, lifetime < 1218 * LONG_MAX / HZ here. 1219 */ 1220 if (time_before(*expires, ifa->tstamp + lifetime * HZ)) 1221 *expires = ifa->tstamp + lifetime * HZ; 1222 spin_unlock(&ifa->lock); 1223 } 1224 1225 return action; 1226 } 1227 1228 static void 1229 cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long expires, bool del_rt) 1230 { 1231 struct fib6_info *f6i; 1232 1233 f6i = addrconf_get_prefix_route(&ifp->addr, ifp->prefix_len, 1234 ifp->idev->dev, 0, RTF_DEFAULT, true); 1235 if (f6i) { 1236 if (del_rt) 1237 ip6_del_rt(dev_net(ifp->idev->dev), f6i); 1238 else { 1239 if (!(f6i->fib6_flags & RTF_EXPIRES)) 1240 fib6_set_expires(f6i, expires); 1241 fib6_info_release(f6i); 1242 } 1243 } 1244 } 1245 1246 1247 /* This function wants to get referenced ifp and releases it before return */ 1248 1249 static void ipv6_del_addr(struct inet6_ifaddr *ifp) 1250 { 1251 int state; 1252 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_NOP; 1253 unsigned long expires; 1254 1255 ASSERT_RTNL(); 1256 1257 spin_lock_bh(&ifp->lock); 1258 state = ifp->state; 1259 ifp->state = INET6_IFADDR_STATE_DEAD; 1260 spin_unlock_bh(&ifp->lock); 1261 1262 if (state == INET6_IFADDR_STATE_DEAD) 1263 goto out; 1264 1265 spin_lock_bh(&addrconf_hash_lock); 1266 hlist_del_init_rcu(&ifp->addr_lst); 1267 spin_unlock_bh(&addrconf_hash_lock); 1268 1269 write_lock_bh(&ifp->idev->lock); 1270 1271 if (ifp->flags&IFA_F_TEMPORARY) { 1272 list_del(&ifp->tmp_list); 1273 if (ifp->ifpub) { 1274 in6_ifa_put(ifp->ifpub); 1275 ifp->ifpub = NULL; 1276 } 1277 __in6_ifa_put(ifp); 1278 } 1279 1280 if (ifp->flags & IFA_F_PERMANENT && !(ifp->flags & IFA_F_NOPREFIXROUTE)) 1281 action = check_cleanup_prefix_route(ifp, &expires); 1282 1283 list_del_rcu(&ifp->if_list); 1284 __in6_ifa_put(ifp); 1285 1286 write_unlock_bh(&ifp->idev->lock); 1287 1288 addrconf_del_dad_work(ifp); 1289 1290 ipv6_ifa_notify(RTM_DELADDR, ifp); 1291 1292 inet6addr_notifier_call_chain(NETDEV_DOWN, ifp); 1293 1294 if (action != CLEANUP_PREFIX_RT_NOP) { 1295 cleanup_prefix_route(ifp, expires, 1296 action == CLEANUP_PREFIX_RT_DEL); 1297 } 1298 1299 /* clean up prefsrc entries */ 1300 rt6_remove_prefsrc(ifp); 1301 out: 1302 in6_ifa_put(ifp); 1303 } 1304 1305 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, 1306 struct inet6_ifaddr *ift, 1307 bool block) 1308 { 1309 struct inet6_dev *idev = ifp->idev; 1310 struct in6_addr addr, *tmpaddr; 1311 unsigned long tmp_tstamp, age; 1312 unsigned long regen_advance; 1313 struct ifa6_config cfg; 1314 int ret = 0; 1315 unsigned long now = jiffies; 1316 long max_desync_factor; 1317 s32 cnf_temp_preferred_lft; 1318 1319 write_lock_bh(&idev->lock); 1320 if (ift) { 1321 spin_lock_bh(&ift->lock); 1322 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8); 1323 spin_unlock_bh(&ift->lock); 1324 tmpaddr = &addr; 1325 } else { 1326 tmpaddr = NULL; 1327 } 1328 retry: 1329 in6_dev_hold(idev); 1330 if (idev->cnf.use_tempaddr <= 0) { 1331 write_unlock_bh(&idev->lock); 1332 pr_info("%s: use_tempaddr is disabled\n", __func__); 1333 in6_dev_put(idev); 1334 ret = -1; 1335 goto out; 1336 } 1337 spin_lock_bh(&ifp->lock); 1338 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) { 1339 idev->cnf.use_tempaddr = -1; /*XXX*/ 1340 spin_unlock_bh(&ifp->lock); 1341 write_unlock_bh(&idev->lock); 1342 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n", 1343 __func__); 1344 in6_dev_put(idev); 1345 ret = -1; 1346 goto out; 1347 } 1348 in6_ifa_hold(ifp); 1349 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8); 1350 ipv6_try_regen_rndid(idev, tmpaddr); 1351 memcpy(&addr.s6_addr[8], idev->rndid, 8); 1352 age = (now - ifp->tstamp) / HZ; 1353 1354 regen_advance = idev->cnf.regen_max_retry * 1355 idev->cnf.dad_transmits * 1356 NEIGH_VAR(idev->nd_parms, RETRANS_TIME) / HZ; 1357 1358 /* recalculate max_desync_factor each time and update 1359 * idev->desync_factor if it's larger 1360 */ 1361 cnf_temp_preferred_lft = READ_ONCE(idev->cnf.temp_prefered_lft); 1362 max_desync_factor = min_t(__u32, 1363 idev->cnf.max_desync_factor, 1364 cnf_temp_preferred_lft - regen_advance); 1365 1366 if (unlikely(idev->desync_factor > max_desync_factor)) { 1367 if (max_desync_factor > 0) { 1368 get_random_bytes(&idev->desync_factor, 1369 sizeof(idev->desync_factor)); 1370 idev->desync_factor %= max_desync_factor; 1371 } else { 1372 idev->desync_factor = 0; 1373 } 1374 } 1375 1376 memset(&cfg, 0, sizeof(cfg)); 1377 cfg.valid_lft = min_t(__u32, ifp->valid_lft, 1378 idev->cnf.temp_valid_lft + age); 1379 cfg.preferred_lft = cnf_temp_preferred_lft + age - idev->desync_factor; 1380 cfg.preferred_lft = min_t(__u32, ifp->prefered_lft, cfg.preferred_lft); 1381 1382 cfg.plen = ifp->prefix_len; 1383 tmp_tstamp = ifp->tstamp; 1384 spin_unlock_bh(&ifp->lock); 1385 1386 write_unlock_bh(&idev->lock); 1387 1388 /* A temporary address is created only if this calculated Preferred 1389 * Lifetime is greater than REGEN_ADVANCE time units. In particular, 1390 * an implementation must not create a temporary address with a zero 1391 * Preferred Lifetime. 1392 * Use age calculation as in addrconf_verify to avoid unnecessary 1393 * temporary addresses being generated. 1394 */ 1395 age = (now - tmp_tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ; 1396 if (cfg.preferred_lft <= regen_advance + age) { 1397 in6_ifa_put(ifp); 1398 in6_dev_put(idev); 1399 ret = -1; 1400 goto out; 1401 } 1402 1403 cfg.ifa_flags = IFA_F_TEMPORARY; 1404 /* set in addrconf_prefix_rcv() */ 1405 if (ifp->flags & IFA_F_OPTIMISTIC) 1406 cfg.ifa_flags |= IFA_F_OPTIMISTIC; 1407 1408 cfg.pfx = &addr; 1409 cfg.scope = ipv6_addr_scope(cfg.pfx); 1410 1411 ift = ipv6_add_addr(idev, &cfg, block, NULL); 1412 if (IS_ERR(ift)) { 1413 in6_ifa_put(ifp); 1414 in6_dev_put(idev); 1415 pr_info("%s: retry temporary address regeneration\n", __func__); 1416 tmpaddr = &addr; 1417 write_lock_bh(&idev->lock); 1418 goto retry; 1419 } 1420 1421 spin_lock_bh(&ift->lock); 1422 ift->ifpub = ifp; 1423 ift->cstamp = now; 1424 ift->tstamp = tmp_tstamp; 1425 spin_unlock_bh(&ift->lock); 1426 1427 addrconf_dad_start(ift); 1428 in6_ifa_put(ift); 1429 in6_dev_put(idev); 1430 out: 1431 return ret; 1432 } 1433 1434 /* 1435 * Choose an appropriate source address (RFC3484) 1436 */ 1437 enum { 1438 IPV6_SADDR_RULE_INIT = 0, 1439 IPV6_SADDR_RULE_LOCAL, 1440 IPV6_SADDR_RULE_SCOPE, 1441 IPV6_SADDR_RULE_PREFERRED, 1442 #ifdef CONFIG_IPV6_MIP6 1443 IPV6_SADDR_RULE_HOA, 1444 #endif 1445 IPV6_SADDR_RULE_OIF, 1446 IPV6_SADDR_RULE_LABEL, 1447 IPV6_SADDR_RULE_PRIVACY, 1448 IPV6_SADDR_RULE_ORCHID, 1449 IPV6_SADDR_RULE_PREFIX, 1450 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1451 IPV6_SADDR_RULE_NOT_OPTIMISTIC, 1452 #endif 1453 IPV6_SADDR_RULE_MAX 1454 }; 1455 1456 struct ipv6_saddr_score { 1457 int rule; 1458 int addr_type; 1459 struct inet6_ifaddr *ifa; 1460 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX); 1461 int scopedist; 1462 int matchlen; 1463 }; 1464 1465 struct ipv6_saddr_dst { 1466 const struct in6_addr *addr; 1467 int ifindex; 1468 int scope; 1469 int label; 1470 unsigned int prefs; 1471 }; 1472 1473 static inline int ipv6_saddr_preferred(int type) 1474 { 1475 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK)) 1476 return 1; 1477 return 0; 1478 } 1479 1480 static bool ipv6_use_optimistic_addr(struct net *net, 1481 struct inet6_dev *idev) 1482 { 1483 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1484 if (!idev) 1485 return false; 1486 if (!net->ipv6.devconf_all->optimistic_dad && !idev->cnf.optimistic_dad) 1487 return false; 1488 if (!net->ipv6.devconf_all->use_optimistic && !idev->cnf.use_optimistic) 1489 return false; 1490 1491 return true; 1492 #else 1493 return false; 1494 #endif 1495 } 1496 1497 static bool ipv6_allow_optimistic_dad(struct net *net, 1498 struct inet6_dev *idev) 1499 { 1500 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1501 if (!idev) 1502 return false; 1503 if (!net->ipv6.devconf_all->optimistic_dad && !idev->cnf.optimistic_dad) 1504 return false; 1505 1506 return true; 1507 #else 1508 return false; 1509 #endif 1510 } 1511 1512 static int ipv6_get_saddr_eval(struct net *net, 1513 struct ipv6_saddr_score *score, 1514 struct ipv6_saddr_dst *dst, 1515 int i) 1516 { 1517 int ret; 1518 1519 if (i <= score->rule) { 1520 switch (i) { 1521 case IPV6_SADDR_RULE_SCOPE: 1522 ret = score->scopedist; 1523 break; 1524 case IPV6_SADDR_RULE_PREFIX: 1525 ret = score->matchlen; 1526 break; 1527 default: 1528 ret = !!test_bit(i, score->scorebits); 1529 } 1530 goto out; 1531 } 1532 1533 switch (i) { 1534 case IPV6_SADDR_RULE_INIT: 1535 /* Rule 0: remember if hiscore is not ready yet */ 1536 ret = !!score->ifa; 1537 break; 1538 case IPV6_SADDR_RULE_LOCAL: 1539 /* Rule 1: Prefer same address */ 1540 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr); 1541 break; 1542 case IPV6_SADDR_RULE_SCOPE: 1543 /* Rule 2: Prefer appropriate scope 1544 * 1545 * ret 1546 * ^ 1547 * -1 | d 15 1548 * ---+--+-+---> scope 1549 * | 1550 * | d is scope of the destination. 1551 * B-d | \ 1552 * | \ <- smaller scope is better if 1553 * B-15 | \ if scope is enough for destination. 1554 * | ret = B - scope (-1 <= scope >= d <= 15). 1555 * d-C-1 | / 1556 * |/ <- greater is better 1557 * -C / if scope is not enough for destination. 1558 * /| ret = scope - C (-1 <= d < scope <= 15). 1559 * 1560 * d - C - 1 < B -15 (for all -1 <= d <= 15). 1561 * C > d + 14 - B >= 15 + 14 - B = 29 - B. 1562 * Assume B = 0 and we get C > 29. 1563 */ 1564 ret = __ipv6_addr_src_scope(score->addr_type); 1565 if (ret >= dst->scope) 1566 ret = -ret; 1567 else 1568 ret -= 128; /* 30 is enough */ 1569 score->scopedist = ret; 1570 break; 1571 case IPV6_SADDR_RULE_PREFERRED: 1572 { 1573 /* Rule 3: Avoid deprecated and optimistic addresses */ 1574 u8 avoid = IFA_F_DEPRECATED; 1575 1576 if (!ipv6_use_optimistic_addr(net, score->ifa->idev)) 1577 avoid |= IFA_F_OPTIMISTIC; 1578 ret = ipv6_saddr_preferred(score->addr_type) || 1579 !(score->ifa->flags & avoid); 1580 break; 1581 } 1582 #ifdef CONFIG_IPV6_MIP6 1583 case IPV6_SADDR_RULE_HOA: 1584 { 1585 /* Rule 4: Prefer home address */ 1586 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA); 1587 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome; 1588 break; 1589 } 1590 #endif 1591 case IPV6_SADDR_RULE_OIF: 1592 /* Rule 5: Prefer outgoing interface */ 1593 ret = (!dst->ifindex || 1594 dst->ifindex == score->ifa->idev->dev->ifindex); 1595 break; 1596 case IPV6_SADDR_RULE_LABEL: 1597 /* Rule 6: Prefer matching label */ 1598 ret = ipv6_addr_label(net, 1599 &score->ifa->addr, score->addr_type, 1600 score->ifa->idev->dev->ifindex) == dst->label; 1601 break; 1602 case IPV6_SADDR_RULE_PRIVACY: 1603 { 1604 /* Rule 7: Prefer public address 1605 * Note: prefer temporary address if use_tempaddr >= 2 1606 */ 1607 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ? 1608 !!(dst->prefs & IPV6_PREFER_SRC_TMP) : 1609 score->ifa->idev->cnf.use_tempaddr >= 2; 1610 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp; 1611 break; 1612 } 1613 case IPV6_SADDR_RULE_ORCHID: 1614 /* Rule 8-: Prefer ORCHID vs ORCHID or 1615 * non-ORCHID vs non-ORCHID 1616 */ 1617 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^ 1618 ipv6_addr_orchid(dst->addr)); 1619 break; 1620 case IPV6_SADDR_RULE_PREFIX: 1621 /* Rule 8: Use longest matching prefix */ 1622 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr); 1623 if (ret > score->ifa->prefix_len) 1624 ret = score->ifa->prefix_len; 1625 score->matchlen = ret; 1626 break; 1627 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1628 case IPV6_SADDR_RULE_NOT_OPTIMISTIC: 1629 /* Optimistic addresses still have lower precedence than other 1630 * preferred addresses. 1631 */ 1632 ret = !(score->ifa->flags & IFA_F_OPTIMISTIC); 1633 break; 1634 #endif 1635 default: 1636 ret = 0; 1637 } 1638 1639 if (ret) 1640 __set_bit(i, score->scorebits); 1641 score->rule = i; 1642 out: 1643 return ret; 1644 } 1645 1646 static int __ipv6_dev_get_saddr(struct net *net, 1647 struct ipv6_saddr_dst *dst, 1648 struct inet6_dev *idev, 1649 struct ipv6_saddr_score *scores, 1650 int hiscore_idx) 1651 { 1652 struct ipv6_saddr_score *score = &scores[1 - hiscore_idx], *hiscore = &scores[hiscore_idx]; 1653 1654 list_for_each_entry_rcu(score->ifa, &idev->addr_list, if_list) { 1655 int i; 1656 1657 /* 1658 * - Tentative Address (RFC2462 section 5.4) 1659 * - A tentative address is not considered 1660 * "assigned to an interface" in the traditional 1661 * sense, unless it is also flagged as optimistic. 1662 * - Candidate Source Address (section 4) 1663 * - In any case, anycast addresses, multicast 1664 * addresses, and the unspecified address MUST 1665 * NOT be included in a candidate set. 1666 */ 1667 if ((score->ifa->flags & IFA_F_TENTATIVE) && 1668 (!(score->ifa->flags & IFA_F_OPTIMISTIC))) 1669 continue; 1670 1671 score->addr_type = __ipv6_addr_type(&score->ifa->addr); 1672 1673 if (unlikely(score->addr_type == IPV6_ADDR_ANY || 1674 score->addr_type & IPV6_ADDR_MULTICAST)) { 1675 net_dbg_ratelimited("ADDRCONF: unspecified / multicast address assigned as unicast address on %s", 1676 idev->dev->name); 1677 continue; 1678 } 1679 1680 score->rule = -1; 1681 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX); 1682 1683 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) { 1684 int minihiscore, miniscore; 1685 1686 minihiscore = ipv6_get_saddr_eval(net, hiscore, dst, i); 1687 miniscore = ipv6_get_saddr_eval(net, score, dst, i); 1688 1689 if (minihiscore > miniscore) { 1690 if (i == IPV6_SADDR_RULE_SCOPE && 1691 score->scopedist > 0) { 1692 /* 1693 * special case: 1694 * each remaining entry 1695 * has too small (not enough) 1696 * scope, because ifa entries 1697 * are sorted by their scope 1698 * values. 1699 */ 1700 goto out; 1701 } 1702 break; 1703 } else if (minihiscore < miniscore) { 1704 swap(hiscore, score); 1705 hiscore_idx = 1 - hiscore_idx; 1706 1707 /* restore our iterator */ 1708 score->ifa = hiscore->ifa; 1709 1710 break; 1711 } 1712 } 1713 } 1714 out: 1715 return hiscore_idx; 1716 } 1717 1718 static int ipv6_get_saddr_master(struct net *net, 1719 const struct net_device *dst_dev, 1720 const struct net_device *master, 1721 struct ipv6_saddr_dst *dst, 1722 struct ipv6_saddr_score *scores, 1723 int hiscore_idx) 1724 { 1725 struct inet6_dev *idev; 1726 1727 idev = __in6_dev_get(dst_dev); 1728 if (idev) 1729 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev, 1730 scores, hiscore_idx); 1731 1732 idev = __in6_dev_get(master); 1733 if (idev) 1734 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev, 1735 scores, hiscore_idx); 1736 1737 return hiscore_idx; 1738 } 1739 1740 int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev, 1741 const struct in6_addr *daddr, unsigned int prefs, 1742 struct in6_addr *saddr) 1743 { 1744 struct ipv6_saddr_score scores[2], *hiscore; 1745 struct ipv6_saddr_dst dst; 1746 struct inet6_dev *idev; 1747 struct net_device *dev; 1748 int dst_type; 1749 bool use_oif_addr = false; 1750 int hiscore_idx = 0; 1751 int ret = 0; 1752 1753 dst_type = __ipv6_addr_type(daddr); 1754 dst.addr = daddr; 1755 dst.ifindex = dst_dev ? dst_dev->ifindex : 0; 1756 dst.scope = __ipv6_addr_src_scope(dst_type); 1757 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex); 1758 dst.prefs = prefs; 1759 1760 scores[hiscore_idx].rule = -1; 1761 scores[hiscore_idx].ifa = NULL; 1762 1763 rcu_read_lock(); 1764 1765 /* Candidate Source Address (section 4) 1766 * - multicast and link-local destination address, 1767 * the set of candidate source address MUST only 1768 * include addresses assigned to interfaces 1769 * belonging to the same link as the outgoing 1770 * interface. 1771 * (- For site-local destination addresses, the 1772 * set of candidate source addresses MUST only 1773 * include addresses assigned to interfaces 1774 * belonging to the same site as the outgoing 1775 * interface.) 1776 * - "It is RECOMMENDED that the candidate source addresses 1777 * be the set of unicast addresses assigned to the 1778 * interface that will be used to send to the destination 1779 * (the 'outgoing' interface)." (RFC 6724) 1780 */ 1781 if (dst_dev) { 1782 idev = __in6_dev_get(dst_dev); 1783 if ((dst_type & IPV6_ADDR_MULTICAST) || 1784 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL || 1785 (idev && idev->cnf.use_oif_addrs_only)) { 1786 use_oif_addr = true; 1787 } 1788 } 1789 1790 if (use_oif_addr) { 1791 if (idev) 1792 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx); 1793 } else { 1794 const struct net_device *master; 1795 int master_idx = 0; 1796 1797 /* if dst_dev exists and is enslaved to an L3 device, then 1798 * prefer addresses from dst_dev and then the master over 1799 * any other enslaved devices in the L3 domain. 1800 */ 1801 master = l3mdev_master_dev_rcu(dst_dev); 1802 if (master) { 1803 master_idx = master->ifindex; 1804 1805 hiscore_idx = ipv6_get_saddr_master(net, dst_dev, 1806 master, &dst, 1807 scores, hiscore_idx); 1808 1809 if (scores[hiscore_idx].ifa) 1810 goto out; 1811 } 1812 1813 for_each_netdev_rcu(net, dev) { 1814 /* only consider addresses on devices in the 1815 * same L3 domain 1816 */ 1817 if (l3mdev_master_ifindex_rcu(dev) != master_idx) 1818 continue; 1819 idev = __in6_dev_get(dev); 1820 if (!idev) 1821 continue; 1822 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx); 1823 } 1824 } 1825 1826 out: 1827 hiscore = &scores[hiscore_idx]; 1828 if (!hiscore->ifa) 1829 ret = -EADDRNOTAVAIL; 1830 else 1831 *saddr = hiscore->ifa->addr; 1832 1833 rcu_read_unlock(); 1834 return ret; 1835 } 1836 EXPORT_SYMBOL(ipv6_dev_get_saddr); 1837 1838 int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr, 1839 u32 banned_flags) 1840 { 1841 struct inet6_ifaddr *ifp; 1842 int err = -EADDRNOTAVAIL; 1843 1844 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) { 1845 if (ifp->scope > IFA_LINK) 1846 break; 1847 if (ifp->scope == IFA_LINK && 1848 !(ifp->flags & banned_flags)) { 1849 *addr = ifp->addr; 1850 err = 0; 1851 break; 1852 } 1853 } 1854 return err; 1855 } 1856 1857 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr, 1858 u32 banned_flags) 1859 { 1860 struct inet6_dev *idev; 1861 int err = -EADDRNOTAVAIL; 1862 1863 rcu_read_lock(); 1864 idev = __in6_dev_get(dev); 1865 if (idev) { 1866 read_lock_bh(&idev->lock); 1867 err = __ipv6_get_lladdr(idev, addr, banned_flags); 1868 read_unlock_bh(&idev->lock); 1869 } 1870 rcu_read_unlock(); 1871 return err; 1872 } 1873 1874 static int ipv6_count_addresses(const struct inet6_dev *idev) 1875 { 1876 const struct inet6_ifaddr *ifp; 1877 int cnt = 0; 1878 1879 rcu_read_lock(); 1880 list_for_each_entry_rcu(ifp, &idev->addr_list, if_list) 1881 cnt++; 1882 rcu_read_unlock(); 1883 return cnt; 1884 } 1885 1886 int ipv6_chk_addr(struct net *net, const struct in6_addr *addr, 1887 const struct net_device *dev, int strict) 1888 { 1889 return ipv6_chk_addr_and_flags(net, addr, dev, !dev, 1890 strict, IFA_F_TENTATIVE); 1891 } 1892 EXPORT_SYMBOL(ipv6_chk_addr); 1893 1894 /* device argument is used to find the L3 domain of interest. If 1895 * skip_dev_check is set, then the ifp device is not checked against 1896 * the passed in dev argument. So the 2 cases for addresses checks are: 1897 * 1. does the address exist in the L3 domain that dev is part of 1898 * (skip_dev_check = true), or 1899 * 1900 * 2. does the address exist on the specific device 1901 * (skip_dev_check = false) 1902 */ 1903 int ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr, 1904 const struct net_device *dev, bool skip_dev_check, 1905 int strict, u32 banned_flags) 1906 { 1907 unsigned int hash = inet6_addr_hash(net, addr); 1908 const struct net_device *l3mdev; 1909 struct inet6_ifaddr *ifp; 1910 u32 ifp_flags; 1911 1912 rcu_read_lock(); 1913 1914 l3mdev = l3mdev_master_dev_rcu(dev); 1915 if (skip_dev_check) 1916 dev = NULL; 1917 1918 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) { 1919 if (!net_eq(dev_net(ifp->idev->dev), net)) 1920 continue; 1921 1922 if (l3mdev_master_dev_rcu(ifp->idev->dev) != l3mdev) 1923 continue; 1924 1925 /* Decouple optimistic from tentative for evaluation here. 1926 * Ban optimistic addresses explicitly, when required. 1927 */ 1928 ifp_flags = (ifp->flags&IFA_F_OPTIMISTIC) 1929 ? (ifp->flags&~IFA_F_TENTATIVE) 1930 : ifp->flags; 1931 if (ipv6_addr_equal(&ifp->addr, addr) && 1932 !(ifp_flags&banned_flags) && 1933 (!dev || ifp->idev->dev == dev || 1934 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) { 1935 rcu_read_unlock(); 1936 return 1; 1937 } 1938 } 1939 1940 rcu_read_unlock(); 1941 return 0; 1942 } 1943 EXPORT_SYMBOL(ipv6_chk_addr_and_flags); 1944 1945 1946 /* Compares an address/prefix_len with addresses on device @dev. 1947 * If one is found it returns true. 1948 */ 1949 bool ipv6_chk_custom_prefix(const struct in6_addr *addr, 1950 const unsigned int prefix_len, struct net_device *dev) 1951 { 1952 const struct inet6_ifaddr *ifa; 1953 const struct inet6_dev *idev; 1954 bool ret = false; 1955 1956 rcu_read_lock(); 1957 idev = __in6_dev_get(dev); 1958 if (idev) { 1959 list_for_each_entry_rcu(ifa, &idev->addr_list, if_list) { 1960 ret = ipv6_prefix_equal(addr, &ifa->addr, prefix_len); 1961 if (ret) 1962 break; 1963 } 1964 } 1965 rcu_read_unlock(); 1966 1967 return ret; 1968 } 1969 EXPORT_SYMBOL(ipv6_chk_custom_prefix); 1970 1971 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev) 1972 { 1973 const struct inet6_ifaddr *ifa; 1974 const struct inet6_dev *idev; 1975 int onlink; 1976 1977 onlink = 0; 1978 rcu_read_lock(); 1979 idev = __in6_dev_get(dev); 1980 if (idev) { 1981 list_for_each_entry_rcu(ifa, &idev->addr_list, if_list) { 1982 onlink = ipv6_prefix_equal(addr, &ifa->addr, 1983 ifa->prefix_len); 1984 if (onlink) 1985 break; 1986 } 1987 } 1988 rcu_read_unlock(); 1989 return onlink; 1990 } 1991 EXPORT_SYMBOL(ipv6_chk_prefix); 1992 1993 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr, 1994 struct net_device *dev, int strict) 1995 { 1996 unsigned int hash = inet6_addr_hash(net, addr); 1997 struct inet6_ifaddr *ifp, *result = NULL; 1998 1999 rcu_read_lock(); 2000 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) { 2001 if (!net_eq(dev_net(ifp->idev->dev), net)) 2002 continue; 2003 if (ipv6_addr_equal(&ifp->addr, addr)) { 2004 if (!dev || ifp->idev->dev == dev || 2005 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) { 2006 result = ifp; 2007 in6_ifa_hold(ifp); 2008 break; 2009 } 2010 } 2011 } 2012 rcu_read_unlock(); 2013 2014 return result; 2015 } 2016 2017 /* Gets referenced address, destroys ifaddr */ 2018 2019 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed) 2020 { 2021 if (dad_failed) 2022 ifp->flags |= IFA_F_DADFAILED; 2023 2024 if (ifp->flags&IFA_F_TEMPORARY) { 2025 struct inet6_ifaddr *ifpub; 2026 spin_lock_bh(&ifp->lock); 2027 ifpub = ifp->ifpub; 2028 if (ifpub) { 2029 in6_ifa_hold(ifpub); 2030 spin_unlock_bh(&ifp->lock); 2031 ipv6_create_tempaddr(ifpub, ifp, true); 2032 in6_ifa_put(ifpub); 2033 } else { 2034 spin_unlock_bh(&ifp->lock); 2035 } 2036 ipv6_del_addr(ifp); 2037 } else if (ifp->flags&IFA_F_PERMANENT || !dad_failed) { 2038 spin_lock_bh(&ifp->lock); 2039 addrconf_del_dad_work(ifp); 2040 ifp->flags |= IFA_F_TENTATIVE; 2041 if (dad_failed) 2042 ifp->flags &= ~IFA_F_OPTIMISTIC; 2043 spin_unlock_bh(&ifp->lock); 2044 if (dad_failed) 2045 ipv6_ifa_notify(0, ifp); 2046 in6_ifa_put(ifp); 2047 } else { 2048 ipv6_del_addr(ifp); 2049 } 2050 } 2051 2052 static int addrconf_dad_end(struct inet6_ifaddr *ifp) 2053 { 2054 int err = -ENOENT; 2055 2056 spin_lock_bh(&ifp->lock); 2057 if (ifp->state == INET6_IFADDR_STATE_DAD) { 2058 ifp->state = INET6_IFADDR_STATE_POSTDAD; 2059 err = 0; 2060 } 2061 spin_unlock_bh(&ifp->lock); 2062 2063 return err; 2064 } 2065 2066 void addrconf_dad_failure(struct sk_buff *skb, struct inet6_ifaddr *ifp) 2067 { 2068 struct inet6_dev *idev = ifp->idev; 2069 struct net *net = dev_net(ifp->idev->dev); 2070 2071 if (addrconf_dad_end(ifp)) { 2072 in6_ifa_put(ifp); 2073 return; 2074 } 2075 2076 net_info_ratelimited("%s: IPv6 duplicate address %pI6c used by %pM detected!\n", 2077 ifp->idev->dev->name, &ifp->addr, eth_hdr(skb)->h_source); 2078 2079 spin_lock_bh(&ifp->lock); 2080 2081 if (ifp->flags & IFA_F_STABLE_PRIVACY) { 2082 struct in6_addr new_addr; 2083 struct inet6_ifaddr *ifp2; 2084 int retries = ifp->stable_privacy_retry + 1; 2085 struct ifa6_config cfg = { 2086 .pfx = &new_addr, 2087 .plen = ifp->prefix_len, 2088 .ifa_flags = ifp->flags, 2089 .valid_lft = ifp->valid_lft, 2090 .preferred_lft = ifp->prefered_lft, 2091 .scope = ifp->scope, 2092 }; 2093 2094 if (retries > net->ipv6.sysctl.idgen_retries) { 2095 net_info_ratelimited("%s: privacy stable address generation failed because of DAD conflicts!\n", 2096 ifp->idev->dev->name); 2097 goto errdad; 2098 } 2099 2100 new_addr = ifp->addr; 2101 if (ipv6_generate_stable_address(&new_addr, retries, 2102 idev)) 2103 goto errdad; 2104 2105 spin_unlock_bh(&ifp->lock); 2106 2107 if (idev->cnf.max_addresses && 2108 ipv6_count_addresses(idev) >= 2109 idev->cnf.max_addresses) 2110 goto lock_errdad; 2111 2112 net_info_ratelimited("%s: generating new stable privacy address because of DAD conflict\n", 2113 ifp->idev->dev->name); 2114 2115 ifp2 = ipv6_add_addr(idev, &cfg, false, NULL); 2116 if (IS_ERR(ifp2)) 2117 goto lock_errdad; 2118 2119 spin_lock_bh(&ifp2->lock); 2120 ifp2->stable_privacy_retry = retries; 2121 ifp2->state = INET6_IFADDR_STATE_PREDAD; 2122 spin_unlock_bh(&ifp2->lock); 2123 2124 addrconf_mod_dad_work(ifp2, net->ipv6.sysctl.idgen_delay); 2125 in6_ifa_put(ifp2); 2126 lock_errdad: 2127 spin_lock_bh(&ifp->lock); 2128 } 2129 2130 errdad: 2131 /* transition from _POSTDAD to _ERRDAD */ 2132 ifp->state = INET6_IFADDR_STATE_ERRDAD; 2133 spin_unlock_bh(&ifp->lock); 2134 2135 addrconf_mod_dad_work(ifp, 0); 2136 in6_ifa_put(ifp); 2137 } 2138 2139 /* Join to solicited addr multicast group. 2140 * caller must hold RTNL */ 2141 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr) 2142 { 2143 struct in6_addr maddr; 2144 2145 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP)) 2146 return; 2147 2148 addrconf_addr_solict_mult(addr, &maddr); 2149 ipv6_dev_mc_inc(dev, &maddr); 2150 } 2151 2152 /* caller must hold RTNL */ 2153 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr) 2154 { 2155 struct in6_addr maddr; 2156 2157 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP)) 2158 return; 2159 2160 addrconf_addr_solict_mult(addr, &maddr); 2161 __ipv6_dev_mc_dec(idev, &maddr); 2162 } 2163 2164 /* caller must hold RTNL */ 2165 static void addrconf_join_anycast(struct inet6_ifaddr *ifp) 2166 { 2167 struct in6_addr addr; 2168 2169 if (ifp->prefix_len >= 127) /* RFC 6164 */ 2170 return; 2171 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len); 2172 if (ipv6_addr_any(&addr)) 2173 return; 2174 __ipv6_dev_ac_inc(ifp->idev, &addr); 2175 } 2176 2177 /* caller must hold RTNL */ 2178 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp) 2179 { 2180 struct in6_addr addr; 2181 2182 if (ifp->prefix_len >= 127) /* RFC 6164 */ 2183 return; 2184 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len); 2185 if (ipv6_addr_any(&addr)) 2186 return; 2187 __ipv6_dev_ac_dec(ifp->idev, &addr); 2188 } 2189 2190 static int addrconf_ifid_6lowpan(u8 *eui, struct net_device *dev) 2191 { 2192 switch (dev->addr_len) { 2193 case ETH_ALEN: 2194 memcpy(eui, dev->dev_addr, 3); 2195 eui[3] = 0xFF; 2196 eui[4] = 0xFE; 2197 memcpy(eui + 5, dev->dev_addr + 3, 3); 2198 break; 2199 case EUI64_ADDR_LEN: 2200 memcpy(eui, dev->dev_addr, EUI64_ADDR_LEN); 2201 eui[0] ^= 2; 2202 break; 2203 default: 2204 return -1; 2205 } 2206 2207 return 0; 2208 } 2209 2210 static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev) 2211 { 2212 union fwnet_hwaddr *ha; 2213 2214 if (dev->addr_len != FWNET_ALEN) 2215 return -1; 2216 2217 ha = (union fwnet_hwaddr *)dev->dev_addr; 2218 2219 memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id)); 2220 eui[0] ^= 2; 2221 return 0; 2222 } 2223 2224 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev) 2225 { 2226 /* XXX: inherit EUI-64 from other interface -- yoshfuji */ 2227 if (dev->addr_len != ARCNET_ALEN) 2228 return -1; 2229 memset(eui, 0, 7); 2230 eui[7] = *(u8 *)dev->dev_addr; 2231 return 0; 2232 } 2233 2234 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev) 2235 { 2236 if (dev->addr_len != INFINIBAND_ALEN) 2237 return -1; 2238 memcpy(eui, dev->dev_addr + 12, 8); 2239 eui[0] |= 2; 2240 return 0; 2241 } 2242 2243 static int __ipv6_isatap_ifid(u8 *eui, __be32 addr) 2244 { 2245 if (addr == 0) 2246 return -1; 2247 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) || 2248 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) || 2249 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) || 2250 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) || 2251 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) || 2252 ipv4_is_lbcast(addr)) ? 0x00 : 0x02; 2253 eui[1] = 0; 2254 eui[2] = 0x5E; 2255 eui[3] = 0xFE; 2256 memcpy(eui + 4, &addr, 4); 2257 return 0; 2258 } 2259 2260 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev) 2261 { 2262 if (dev->priv_flags & IFF_ISATAP) 2263 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr); 2264 return -1; 2265 } 2266 2267 static int addrconf_ifid_gre(u8 *eui, struct net_device *dev) 2268 { 2269 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr); 2270 } 2271 2272 static int addrconf_ifid_ip6tnl(u8 *eui, struct net_device *dev) 2273 { 2274 memcpy(eui, dev->perm_addr, 3); 2275 memcpy(eui + 5, dev->perm_addr + 3, 3); 2276 eui[3] = 0xFF; 2277 eui[4] = 0xFE; 2278 eui[0] ^= 2; 2279 return 0; 2280 } 2281 2282 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev) 2283 { 2284 switch (dev->type) { 2285 case ARPHRD_ETHER: 2286 case ARPHRD_FDDI: 2287 return addrconf_ifid_eui48(eui, dev); 2288 case ARPHRD_ARCNET: 2289 return addrconf_ifid_arcnet(eui, dev); 2290 case ARPHRD_INFINIBAND: 2291 return addrconf_ifid_infiniband(eui, dev); 2292 case ARPHRD_SIT: 2293 return addrconf_ifid_sit(eui, dev); 2294 case ARPHRD_IPGRE: 2295 case ARPHRD_TUNNEL: 2296 return addrconf_ifid_gre(eui, dev); 2297 case ARPHRD_6LOWPAN: 2298 return addrconf_ifid_6lowpan(eui, dev); 2299 case ARPHRD_IEEE1394: 2300 return addrconf_ifid_ieee1394(eui, dev); 2301 case ARPHRD_TUNNEL6: 2302 case ARPHRD_IP6GRE: 2303 case ARPHRD_RAWIP: 2304 return addrconf_ifid_ip6tnl(eui, dev); 2305 } 2306 return -1; 2307 } 2308 2309 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev) 2310 { 2311 int err = -1; 2312 struct inet6_ifaddr *ifp; 2313 2314 read_lock_bh(&idev->lock); 2315 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) { 2316 if (ifp->scope > IFA_LINK) 2317 break; 2318 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) { 2319 memcpy(eui, ifp->addr.s6_addr+8, 8); 2320 err = 0; 2321 break; 2322 } 2323 } 2324 read_unlock_bh(&idev->lock); 2325 return err; 2326 } 2327 2328 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */ 2329 static void ipv6_regen_rndid(struct inet6_dev *idev) 2330 { 2331 regen: 2332 get_random_bytes(idev->rndid, sizeof(idev->rndid)); 2333 idev->rndid[0] &= ~0x02; 2334 2335 /* 2336 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>: 2337 * check if generated address is not inappropriate 2338 * 2339 * - Reserved subnet anycast (RFC 2526) 2340 * 11111101 11....11 1xxxxxxx 2341 * - ISATAP (RFC4214) 6.1 2342 * 00-00-5E-FE-xx-xx-xx-xx 2343 * - value 0 2344 * - XXX: already assigned to an address on the device 2345 */ 2346 if (idev->rndid[0] == 0xfd && 2347 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff && 2348 (idev->rndid[7]&0x80)) 2349 goto regen; 2350 if ((idev->rndid[0]|idev->rndid[1]) == 0) { 2351 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe) 2352 goto regen; 2353 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00) 2354 goto regen; 2355 } 2356 } 2357 2358 static void ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) 2359 { 2360 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0) 2361 ipv6_regen_rndid(idev); 2362 } 2363 2364 /* 2365 * Add prefix route. 2366 */ 2367 2368 static void 2369 addrconf_prefix_route(struct in6_addr *pfx, int plen, u32 metric, 2370 struct net_device *dev, unsigned long expires, 2371 u32 flags, gfp_t gfp_flags) 2372 { 2373 struct fib6_config cfg = { 2374 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX, 2375 .fc_metric = metric ? : IP6_RT_PRIO_ADDRCONF, 2376 .fc_ifindex = dev->ifindex, 2377 .fc_expires = expires, 2378 .fc_dst_len = plen, 2379 .fc_flags = RTF_UP | flags, 2380 .fc_nlinfo.nl_net = dev_net(dev), 2381 .fc_protocol = RTPROT_KERNEL, 2382 .fc_type = RTN_UNICAST, 2383 }; 2384 2385 cfg.fc_dst = *pfx; 2386 2387 /* Prevent useless cloning on PtP SIT. 2388 This thing is done here expecting that the whole 2389 class of non-broadcast devices need not cloning. 2390 */ 2391 #if IS_ENABLED(CONFIG_IPV6_SIT) 2392 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT)) 2393 cfg.fc_flags |= RTF_NONEXTHOP; 2394 #endif 2395 2396 ip6_route_add(&cfg, gfp_flags, NULL); 2397 } 2398 2399 2400 static struct fib6_info *addrconf_get_prefix_route(const struct in6_addr *pfx, 2401 int plen, 2402 const struct net_device *dev, 2403 u32 flags, u32 noflags, 2404 bool no_gw) 2405 { 2406 struct fib6_node *fn; 2407 struct fib6_info *rt = NULL; 2408 struct fib6_table *table; 2409 u32 tb_id = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX; 2410 2411 table = fib6_get_table(dev_net(dev), tb_id); 2412 if (!table) 2413 return NULL; 2414 2415 rcu_read_lock(); 2416 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0, true); 2417 if (!fn) 2418 goto out; 2419 2420 for_each_fib6_node_rt_rcu(fn) { 2421 /* prefix routes only use builtin fib6_nh */ 2422 if (rt->nh) 2423 continue; 2424 2425 if (rt->fib6_nh->fib_nh_dev->ifindex != dev->ifindex) 2426 continue; 2427 if (no_gw && rt->fib6_nh->fib_nh_gw_family) 2428 continue; 2429 if ((rt->fib6_flags & flags) != flags) 2430 continue; 2431 if ((rt->fib6_flags & noflags) != 0) 2432 continue; 2433 if (!fib6_info_hold_safe(rt)) 2434 continue; 2435 break; 2436 } 2437 out: 2438 rcu_read_unlock(); 2439 return rt; 2440 } 2441 2442 2443 /* Create "default" multicast route to the interface */ 2444 2445 static void addrconf_add_mroute(struct net_device *dev) 2446 { 2447 struct fib6_config cfg = { 2448 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_LOCAL, 2449 .fc_metric = IP6_RT_PRIO_ADDRCONF, 2450 .fc_ifindex = dev->ifindex, 2451 .fc_dst_len = 8, 2452 .fc_flags = RTF_UP, 2453 .fc_type = RTN_UNICAST, 2454 .fc_nlinfo.nl_net = dev_net(dev), 2455 }; 2456 2457 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0); 2458 2459 ip6_route_add(&cfg, GFP_KERNEL, NULL); 2460 } 2461 2462 static struct inet6_dev *addrconf_add_dev(struct net_device *dev) 2463 { 2464 struct inet6_dev *idev; 2465 2466 ASSERT_RTNL(); 2467 2468 idev = ipv6_find_idev(dev); 2469 if (IS_ERR(idev)) 2470 return idev; 2471 2472 if (idev->cnf.disable_ipv6) 2473 return ERR_PTR(-EACCES); 2474 2475 /* Add default multicast route */ 2476 if (!(dev->flags & IFF_LOOPBACK) && !netif_is_l3_master(dev)) 2477 addrconf_add_mroute(dev); 2478 2479 return idev; 2480 } 2481 2482 static void manage_tempaddrs(struct inet6_dev *idev, 2483 struct inet6_ifaddr *ifp, 2484 __u32 valid_lft, __u32 prefered_lft, 2485 bool create, unsigned long now) 2486 { 2487 u32 flags; 2488 struct inet6_ifaddr *ift; 2489 2490 read_lock_bh(&idev->lock); 2491 /* update all temporary addresses in the list */ 2492 list_for_each_entry(ift, &idev->tempaddr_list, tmp_list) { 2493 int age, max_valid, max_prefered; 2494 2495 if (ifp != ift->ifpub) 2496 continue; 2497 2498 /* RFC 4941 section 3.3: 2499 * If a received option will extend the lifetime of a public 2500 * address, the lifetimes of temporary addresses should 2501 * be extended, subject to the overall constraint that no 2502 * temporary addresses should ever remain "valid" or "preferred" 2503 * for a time longer than (TEMP_VALID_LIFETIME) or 2504 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), respectively. 2505 */ 2506 age = (now - ift->cstamp) / HZ; 2507 max_valid = idev->cnf.temp_valid_lft - age; 2508 if (max_valid < 0) 2509 max_valid = 0; 2510 2511 max_prefered = idev->cnf.temp_prefered_lft - 2512 idev->desync_factor - age; 2513 if (max_prefered < 0) 2514 max_prefered = 0; 2515 2516 if (valid_lft > max_valid) 2517 valid_lft = max_valid; 2518 2519 if (prefered_lft > max_prefered) 2520 prefered_lft = max_prefered; 2521 2522 spin_lock(&ift->lock); 2523 flags = ift->flags; 2524 ift->valid_lft = valid_lft; 2525 ift->prefered_lft = prefered_lft; 2526 ift->tstamp = now; 2527 if (prefered_lft > 0) 2528 ift->flags &= ~IFA_F_DEPRECATED; 2529 2530 spin_unlock(&ift->lock); 2531 if (!(flags&IFA_F_TENTATIVE)) 2532 ipv6_ifa_notify(0, ift); 2533 } 2534 2535 if ((create || list_empty(&idev->tempaddr_list)) && 2536 idev->cnf.use_tempaddr > 0) { 2537 /* When a new public address is created as described 2538 * in [ADDRCONF], also create a new temporary address. 2539 * Also create a temporary address if it's enabled but 2540 * no temporary address currently exists. 2541 */ 2542 read_unlock_bh(&idev->lock); 2543 ipv6_create_tempaddr(ifp, NULL, false); 2544 } else { 2545 read_unlock_bh(&idev->lock); 2546 } 2547 } 2548 2549 static bool is_addr_mode_generate_stable(struct inet6_dev *idev) 2550 { 2551 return idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY || 2552 idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_RANDOM; 2553 } 2554 2555 int addrconf_prefix_rcv_add_addr(struct net *net, struct net_device *dev, 2556 const struct prefix_info *pinfo, 2557 struct inet6_dev *in6_dev, 2558 const struct in6_addr *addr, int addr_type, 2559 u32 addr_flags, bool sllao, bool tokenized, 2560 __u32 valid_lft, u32 prefered_lft) 2561 { 2562 struct inet6_ifaddr *ifp = ipv6_get_ifaddr(net, addr, dev, 1); 2563 int create = 0, update_lft = 0; 2564 2565 if (!ifp && valid_lft) { 2566 int max_addresses = in6_dev->cnf.max_addresses; 2567 struct ifa6_config cfg = { 2568 .pfx = addr, 2569 .plen = pinfo->prefix_len, 2570 .ifa_flags = addr_flags, 2571 .valid_lft = valid_lft, 2572 .preferred_lft = prefered_lft, 2573 .scope = addr_type & IPV6_ADDR_SCOPE_MASK, 2574 }; 2575 2576 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 2577 if ((net->ipv6.devconf_all->optimistic_dad || 2578 in6_dev->cnf.optimistic_dad) && 2579 !net->ipv6.devconf_all->forwarding && sllao) 2580 cfg.ifa_flags |= IFA_F_OPTIMISTIC; 2581 #endif 2582 2583 /* Do not allow to create too much of autoconfigured 2584 * addresses; this would be too easy way to crash kernel. 2585 */ 2586 if (!max_addresses || 2587 ipv6_count_addresses(in6_dev) < max_addresses) 2588 ifp = ipv6_add_addr(in6_dev, &cfg, false, NULL); 2589 2590 if (IS_ERR_OR_NULL(ifp)) 2591 return -1; 2592 2593 create = 1; 2594 spin_lock_bh(&ifp->lock); 2595 ifp->flags |= IFA_F_MANAGETEMPADDR; 2596 ifp->cstamp = jiffies; 2597 ifp->tokenized = tokenized; 2598 spin_unlock_bh(&ifp->lock); 2599 addrconf_dad_start(ifp); 2600 } 2601 2602 if (ifp) { 2603 u32 flags; 2604 unsigned long now; 2605 u32 stored_lft; 2606 2607 /* update lifetime (RFC2462 5.5.3 e) */ 2608 spin_lock_bh(&ifp->lock); 2609 now = jiffies; 2610 if (ifp->valid_lft > (now - ifp->tstamp) / HZ) 2611 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ; 2612 else 2613 stored_lft = 0; 2614 if (!create && stored_lft) { 2615 const u32 minimum_lft = min_t(u32, 2616 stored_lft, MIN_VALID_LIFETIME); 2617 valid_lft = max(valid_lft, minimum_lft); 2618 2619 /* RFC4862 Section 5.5.3e: 2620 * "Note that the preferred lifetime of the 2621 * corresponding address is always reset to 2622 * the Preferred Lifetime in the received 2623 * Prefix Information option, regardless of 2624 * whether the valid lifetime is also reset or 2625 * ignored." 2626 * 2627 * So we should always update prefered_lft here. 2628 */ 2629 update_lft = 1; 2630 } 2631 2632 if (update_lft) { 2633 ifp->valid_lft = valid_lft; 2634 ifp->prefered_lft = prefered_lft; 2635 ifp->tstamp = now; 2636 flags = ifp->flags; 2637 ifp->flags &= ~IFA_F_DEPRECATED; 2638 spin_unlock_bh(&ifp->lock); 2639 2640 if (!(flags&IFA_F_TENTATIVE)) 2641 ipv6_ifa_notify(0, ifp); 2642 } else 2643 spin_unlock_bh(&ifp->lock); 2644 2645 manage_tempaddrs(in6_dev, ifp, valid_lft, prefered_lft, 2646 create, now); 2647 2648 in6_ifa_put(ifp); 2649 addrconf_verify(); 2650 } 2651 2652 return 0; 2653 } 2654 EXPORT_SYMBOL_GPL(addrconf_prefix_rcv_add_addr); 2655 2656 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao) 2657 { 2658 struct prefix_info *pinfo; 2659 __u32 valid_lft; 2660 __u32 prefered_lft; 2661 int addr_type, err; 2662 u32 addr_flags = 0; 2663 struct inet6_dev *in6_dev; 2664 struct net *net = dev_net(dev); 2665 2666 pinfo = (struct prefix_info *) opt; 2667 2668 if (len < sizeof(struct prefix_info)) { 2669 netdev_dbg(dev, "addrconf: prefix option too short\n"); 2670 return; 2671 } 2672 2673 /* 2674 * Validation checks ([ADDRCONF], page 19) 2675 */ 2676 2677 addr_type = ipv6_addr_type(&pinfo->prefix); 2678 2679 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL)) 2680 return; 2681 2682 valid_lft = ntohl(pinfo->valid); 2683 prefered_lft = ntohl(pinfo->prefered); 2684 2685 if (prefered_lft > valid_lft) { 2686 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n"); 2687 return; 2688 } 2689 2690 in6_dev = in6_dev_get(dev); 2691 2692 if (!in6_dev) { 2693 net_dbg_ratelimited("addrconf: device %s not configured\n", 2694 dev->name); 2695 return; 2696 } 2697 2698 /* 2699 * Two things going on here: 2700 * 1) Add routes for on-link prefixes 2701 * 2) Configure prefixes with the auto flag set 2702 */ 2703 2704 if (pinfo->onlink) { 2705 struct fib6_info *rt; 2706 unsigned long rt_expires; 2707 2708 /* Avoid arithmetic overflow. Really, we could 2709 * save rt_expires in seconds, likely valid_lft, 2710 * but it would require division in fib gc, that it 2711 * not good. 2712 */ 2713 if (HZ > USER_HZ) 2714 rt_expires = addrconf_timeout_fixup(valid_lft, HZ); 2715 else 2716 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ); 2717 2718 if (addrconf_finite_timeout(rt_expires)) 2719 rt_expires *= HZ; 2720 2721 rt = addrconf_get_prefix_route(&pinfo->prefix, 2722 pinfo->prefix_len, 2723 dev, 2724 RTF_ADDRCONF | RTF_PREFIX_RT, 2725 RTF_DEFAULT, true); 2726 2727 if (rt) { 2728 /* Autoconf prefix route */ 2729 if (valid_lft == 0) { 2730 ip6_del_rt(net, rt); 2731 rt = NULL; 2732 } else if (addrconf_finite_timeout(rt_expires)) { 2733 /* not infinity */ 2734 fib6_set_expires(rt, jiffies + rt_expires); 2735 } else { 2736 fib6_clean_expires(rt); 2737 } 2738 } else if (valid_lft) { 2739 clock_t expires = 0; 2740 int flags = RTF_ADDRCONF | RTF_PREFIX_RT; 2741 if (addrconf_finite_timeout(rt_expires)) { 2742 /* not infinity */ 2743 flags |= RTF_EXPIRES; 2744 expires = jiffies_to_clock_t(rt_expires); 2745 } 2746 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len, 2747 0, dev, expires, flags, 2748 GFP_ATOMIC); 2749 } 2750 fib6_info_release(rt); 2751 } 2752 2753 /* Try to figure out our local address for this prefix */ 2754 2755 if (pinfo->autoconf && in6_dev->cnf.autoconf) { 2756 struct in6_addr addr; 2757 bool tokenized = false, dev_addr_generated = false; 2758 2759 if (pinfo->prefix_len == 64) { 2760 memcpy(&addr, &pinfo->prefix, 8); 2761 2762 if (!ipv6_addr_any(&in6_dev->token)) { 2763 read_lock_bh(&in6_dev->lock); 2764 memcpy(addr.s6_addr + 8, 2765 in6_dev->token.s6_addr + 8, 8); 2766 read_unlock_bh(&in6_dev->lock); 2767 tokenized = true; 2768 } else if (is_addr_mode_generate_stable(in6_dev) && 2769 !ipv6_generate_stable_address(&addr, 0, 2770 in6_dev)) { 2771 addr_flags |= IFA_F_STABLE_PRIVACY; 2772 goto ok; 2773 } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) && 2774 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) { 2775 goto put; 2776 } else { 2777 dev_addr_generated = true; 2778 } 2779 goto ok; 2780 } 2781 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n", 2782 pinfo->prefix_len); 2783 goto put; 2784 2785 ok: 2786 err = addrconf_prefix_rcv_add_addr(net, dev, pinfo, in6_dev, 2787 &addr, addr_type, 2788 addr_flags, sllao, 2789 tokenized, valid_lft, 2790 prefered_lft); 2791 if (err) 2792 goto put; 2793 2794 /* Ignore error case here because previous prefix add addr was 2795 * successful which will be notified. 2796 */ 2797 ndisc_ops_prefix_rcv_add_addr(net, dev, pinfo, in6_dev, &addr, 2798 addr_type, addr_flags, sllao, 2799 tokenized, valid_lft, 2800 prefered_lft, 2801 dev_addr_generated); 2802 } 2803 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo); 2804 put: 2805 in6_dev_put(in6_dev); 2806 } 2807 2808 /* 2809 * Set destination address. 2810 * Special case for SIT interfaces where we create a new "virtual" 2811 * device. 2812 */ 2813 int addrconf_set_dstaddr(struct net *net, void __user *arg) 2814 { 2815 struct in6_ifreq ireq; 2816 struct net_device *dev; 2817 int err = -EINVAL; 2818 2819 rtnl_lock(); 2820 2821 err = -EFAULT; 2822 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2823 goto err_exit; 2824 2825 dev = __dev_get_by_index(net, ireq.ifr6_ifindex); 2826 2827 err = -ENODEV; 2828 if (!dev) 2829 goto err_exit; 2830 2831 #if IS_ENABLED(CONFIG_IPV6_SIT) 2832 if (dev->type == ARPHRD_SIT) { 2833 const struct net_device_ops *ops = dev->netdev_ops; 2834 struct ifreq ifr; 2835 struct ip_tunnel_parm p; 2836 2837 err = -EADDRNOTAVAIL; 2838 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4)) 2839 goto err_exit; 2840 2841 memset(&p, 0, sizeof(p)); 2842 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3]; 2843 p.iph.saddr = 0; 2844 p.iph.version = 4; 2845 p.iph.ihl = 5; 2846 p.iph.protocol = IPPROTO_IPV6; 2847 p.iph.ttl = 64; 2848 ifr.ifr_ifru.ifru_data = (__force void __user *)&p; 2849 2850 if (ops->ndo_do_ioctl) { 2851 mm_segment_t oldfs = get_fs(); 2852 2853 set_fs(KERNEL_DS); 2854 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL); 2855 set_fs(oldfs); 2856 } else 2857 err = -EOPNOTSUPP; 2858 2859 if (err == 0) { 2860 err = -ENOBUFS; 2861 dev = __dev_get_by_name(net, p.name); 2862 if (!dev) 2863 goto err_exit; 2864 err = dev_open(dev, NULL); 2865 } 2866 } 2867 #endif 2868 2869 err_exit: 2870 rtnl_unlock(); 2871 return err; 2872 } 2873 2874 static int ipv6_mc_config(struct sock *sk, bool join, 2875 const struct in6_addr *addr, int ifindex) 2876 { 2877 int ret; 2878 2879 ASSERT_RTNL(); 2880 2881 lock_sock(sk); 2882 if (join) 2883 ret = ipv6_sock_mc_join(sk, ifindex, addr); 2884 else 2885 ret = ipv6_sock_mc_drop(sk, ifindex, addr); 2886 release_sock(sk); 2887 2888 return ret; 2889 } 2890 2891 /* 2892 * Manual configuration of address on an interface 2893 */ 2894 static int inet6_addr_add(struct net *net, int ifindex, 2895 struct ifa6_config *cfg, 2896 struct netlink_ext_ack *extack) 2897 { 2898 struct inet6_ifaddr *ifp; 2899 struct inet6_dev *idev; 2900 struct net_device *dev; 2901 unsigned long timeout; 2902 clock_t expires; 2903 u32 flags; 2904 2905 ASSERT_RTNL(); 2906 2907 if (cfg->plen > 128) 2908 return -EINVAL; 2909 2910 /* check the lifetime */ 2911 if (!cfg->valid_lft || cfg->preferred_lft > cfg->valid_lft) 2912 return -EINVAL; 2913 2914 if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR && cfg->plen != 64) 2915 return -EINVAL; 2916 2917 dev = __dev_get_by_index(net, ifindex); 2918 if (!dev) 2919 return -ENODEV; 2920 2921 idev = addrconf_add_dev(dev); 2922 if (IS_ERR(idev)) 2923 return PTR_ERR(idev); 2924 2925 if (cfg->ifa_flags & IFA_F_MCAUTOJOIN) { 2926 int ret = ipv6_mc_config(net->ipv6.mc_autojoin_sk, 2927 true, cfg->pfx, ifindex); 2928 2929 if (ret < 0) 2930 return ret; 2931 } 2932 2933 cfg->scope = ipv6_addr_scope(cfg->pfx); 2934 2935 timeout = addrconf_timeout_fixup(cfg->valid_lft, HZ); 2936 if (addrconf_finite_timeout(timeout)) { 2937 expires = jiffies_to_clock_t(timeout * HZ); 2938 cfg->valid_lft = timeout; 2939 flags = RTF_EXPIRES; 2940 } else { 2941 expires = 0; 2942 flags = 0; 2943 cfg->ifa_flags |= IFA_F_PERMANENT; 2944 } 2945 2946 timeout = addrconf_timeout_fixup(cfg->preferred_lft, HZ); 2947 if (addrconf_finite_timeout(timeout)) { 2948 if (timeout == 0) 2949 cfg->ifa_flags |= IFA_F_DEPRECATED; 2950 cfg->preferred_lft = timeout; 2951 } 2952 2953 ifp = ipv6_add_addr(idev, cfg, true, extack); 2954 if (!IS_ERR(ifp)) { 2955 if (!(cfg->ifa_flags & IFA_F_NOPREFIXROUTE)) { 2956 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, 2957 ifp->rt_priority, dev, expires, 2958 flags, GFP_KERNEL); 2959 } 2960 2961 /* Send a netlink notification if DAD is enabled and 2962 * optimistic flag is not set 2963 */ 2964 if (!(ifp->flags & (IFA_F_OPTIMISTIC | IFA_F_NODAD))) 2965 ipv6_ifa_notify(0, ifp); 2966 /* 2967 * Note that section 3.1 of RFC 4429 indicates 2968 * that the Optimistic flag should not be set for 2969 * manually configured addresses 2970 */ 2971 addrconf_dad_start(ifp); 2972 if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR) 2973 manage_tempaddrs(idev, ifp, cfg->valid_lft, 2974 cfg->preferred_lft, true, jiffies); 2975 in6_ifa_put(ifp); 2976 addrconf_verify_rtnl(); 2977 return 0; 2978 } else if (cfg->ifa_flags & IFA_F_MCAUTOJOIN) { 2979 ipv6_mc_config(net->ipv6.mc_autojoin_sk, false, 2980 cfg->pfx, ifindex); 2981 } 2982 2983 return PTR_ERR(ifp); 2984 } 2985 2986 static int inet6_addr_del(struct net *net, int ifindex, u32 ifa_flags, 2987 const struct in6_addr *pfx, unsigned int plen) 2988 { 2989 struct inet6_ifaddr *ifp; 2990 struct inet6_dev *idev; 2991 struct net_device *dev; 2992 2993 if (plen > 128) 2994 return -EINVAL; 2995 2996 dev = __dev_get_by_index(net, ifindex); 2997 if (!dev) 2998 return -ENODEV; 2999 3000 idev = __in6_dev_get(dev); 3001 if (!idev) 3002 return -ENXIO; 3003 3004 read_lock_bh(&idev->lock); 3005 list_for_each_entry(ifp, &idev->addr_list, if_list) { 3006 if (ifp->prefix_len == plen && 3007 ipv6_addr_equal(pfx, &ifp->addr)) { 3008 in6_ifa_hold(ifp); 3009 read_unlock_bh(&idev->lock); 3010 3011 if (!(ifp->flags & IFA_F_TEMPORARY) && 3012 (ifa_flags & IFA_F_MANAGETEMPADDR)) 3013 manage_tempaddrs(idev, ifp, 0, 0, false, 3014 jiffies); 3015 ipv6_del_addr(ifp); 3016 addrconf_verify_rtnl(); 3017 if (ipv6_addr_is_multicast(pfx)) { 3018 ipv6_mc_config(net->ipv6.mc_autojoin_sk, 3019 false, pfx, dev->ifindex); 3020 } 3021 return 0; 3022 } 3023 } 3024 read_unlock_bh(&idev->lock); 3025 return -EADDRNOTAVAIL; 3026 } 3027 3028 3029 int addrconf_add_ifaddr(struct net *net, void __user *arg) 3030 { 3031 struct ifa6_config cfg = { 3032 .ifa_flags = IFA_F_PERMANENT, 3033 .preferred_lft = INFINITY_LIFE_TIME, 3034 .valid_lft = INFINITY_LIFE_TIME, 3035 }; 3036 struct in6_ifreq ireq; 3037 int err; 3038 3039 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 3040 return -EPERM; 3041 3042 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 3043 return -EFAULT; 3044 3045 cfg.pfx = &ireq.ifr6_addr; 3046 cfg.plen = ireq.ifr6_prefixlen; 3047 3048 rtnl_lock(); 3049 err = inet6_addr_add(net, ireq.ifr6_ifindex, &cfg, NULL); 3050 rtnl_unlock(); 3051 return err; 3052 } 3053 3054 int addrconf_del_ifaddr(struct net *net, void __user *arg) 3055 { 3056 struct in6_ifreq ireq; 3057 int err; 3058 3059 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 3060 return -EPERM; 3061 3062 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 3063 return -EFAULT; 3064 3065 rtnl_lock(); 3066 err = inet6_addr_del(net, ireq.ifr6_ifindex, 0, &ireq.ifr6_addr, 3067 ireq.ifr6_prefixlen); 3068 rtnl_unlock(); 3069 return err; 3070 } 3071 3072 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr, 3073 int plen, int scope) 3074 { 3075 struct inet6_ifaddr *ifp; 3076 struct ifa6_config cfg = { 3077 .pfx = addr, 3078 .plen = plen, 3079 .ifa_flags = IFA_F_PERMANENT, 3080 .valid_lft = INFINITY_LIFE_TIME, 3081 .preferred_lft = INFINITY_LIFE_TIME, 3082 .scope = scope 3083 }; 3084 3085 ifp = ipv6_add_addr(idev, &cfg, true, NULL); 3086 if (!IS_ERR(ifp)) { 3087 spin_lock_bh(&ifp->lock); 3088 ifp->flags &= ~IFA_F_TENTATIVE; 3089 spin_unlock_bh(&ifp->lock); 3090 rt_genid_bump_ipv6(dev_net(idev->dev)); 3091 ipv6_ifa_notify(RTM_NEWADDR, ifp); 3092 in6_ifa_put(ifp); 3093 } 3094 } 3095 3096 #if IS_ENABLED(CONFIG_IPV6_SIT) 3097 static void sit_add_v4_addrs(struct inet6_dev *idev) 3098 { 3099 struct in6_addr addr; 3100 struct net_device *dev; 3101 struct net *net = dev_net(idev->dev); 3102 int scope, plen; 3103 u32 pflags = 0; 3104 3105 ASSERT_RTNL(); 3106 3107 memset(&addr, 0, sizeof(struct in6_addr)); 3108 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4); 3109 3110 if (idev->dev->flags&IFF_POINTOPOINT) { 3111 addr.s6_addr32[0] = htonl(0xfe800000); 3112 scope = IFA_LINK; 3113 plen = 64; 3114 } else { 3115 scope = IPV6_ADDR_COMPATv4; 3116 plen = 96; 3117 pflags |= RTF_NONEXTHOP; 3118 } 3119 3120 if (addr.s6_addr32[3]) { 3121 add_addr(idev, &addr, plen, scope); 3122 addrconf_prefix_route(&addr, plen, 0, idev->dev, 0, pflags, 3123 GFP_KERNEL); 3124 return; 3125 } 3126 3127 for_each_netdev(net, dev) { 3128 struct in_device *in_dev = __in_dev_get_rtnl(dev); 3129 if (in_dev && (dev->flags & IFF_UP)) { 3130 struct in_ifaddr *ifa; 3131 int flag = scope; 3132 3133 in_dev_for_each_ifa_rtnl(ifa, in_dev) { 3134 addr.s6_addr32[3] = ifa->ifa_local; 3135 3136 if (ifa->ifa_scope == RT_SCOPE_LINK) 3137 continue; 3138 if (ifa->ifa_scope >= RT_SCOPE_HOST) { 3139 if (idev->dev->flags&IFF_POINTOPOINT) 3140 continue; 3141 flag |= IFA_HOST; 3142 } 3143 3144 add_addr(idev, &addr, plen, flag); 3145 addrconf_prefix_route(&addr, plen, 0, idev->dev, 3146 0, pflags, GFP_KERNEL); 3147 } 3148 } 3149 } 3150 } 3151 #endif 3152 3153 static void init_loopback(struct net_device *dev) 3154 { 3155 struct inet6_dev *idev; 3156 3157 /* ::1 */ 3158 3159 ASSERT_RTNL(); 3160 3161 idev = ipv6_find_idev(dev); 3162 if (IS_ERR(idev)) { 3163 pr_debug("%s: add_dev failed\n", __func__); 3164 return; 3165 } 3166 3167 add_addr(idev, &in6addr_loopback, 128, IFA_HOST); 3168 } 3169 3170 void addrconf_add_linklocal(struct inet6_dev *idev, 3171 const struct in6_addr *addr, u32 flags) 3172 { 3173 struct ifa6_config cfg = { 3174 .pfx = addr, 3175 .plen = 64, 3176 .ifa_flags = flags | IFA_F_PERMANENT, 3177 .valid_lft = INFINITY_LIFE_TIME, 3178 .preferred_lft = INFINITY_LIFE_TIME, 3179 .scope = IFA_LINK 3180 }; 3181 struct inet6_ifaddr *ifp; 3182 3183 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 3184 if ((dev_net(idev->dev)->ipv6.devconf_all->optimistic_dad || 3185 idev->cnf.optimistic_dad) && 3186 !dev_net(idev->dev)->ipv6.devconf_all->forwarding) 3187 cfg.ifa_flags |= IFA_F_OPTIMISTIC; 3188 #endif 3189 3190 ifp = ipv6_add_addr(idev, &cfg, true, NULL); 3191 if (!IS_ERR(ifp)) { 3192 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, 0, idev->dev, 3193 0, 0, GFP_ATOMIC); 3194 addrconf_dad_start(ifp); 3195 in6_ifa_put(ifp); 3196 } 3197 } 3198 EXPORT_SYMBOL_GPL(addrconf_add_linklocal); 3199 3200 static bool ipv6_reserved_interfaceid(struct in6_addr address) 3201 { 3202 if ((address.s6_addr32[2] | address.s6_addr32[3]) == 0) 3203 return true; 3204 3205 if (address.s6_addr32[2] == htonl(0x02005eff) && 3206 ((address.s6_addr32[3] & htonl(0xfe000000)) == htonl(0xfe000000))) 3207 return true; 3208 3209 if (address.s6_addr32[2] == htonl(0xfdffffff) && 3210 ((address.s6_addr32[3] & htonl(0xffffff80)) == htonl(0xffffff80))) 3211 return true; 3212 3213 return false; 3214 } 3215 3216 static int ipv6_generate_stable_address(struct in6_addr *address, 3217 u8 dad_count, 3218 const struct inet6_dev *idev) 3219 { 3220 static DEFINE_SPINLOCK(lock); 3221 static __u32 digest[SHA_DIGEST_WORDS]; 3222 static __u32 workspace[SHA_WORKSPACE_WORDS]; 3223 3224 static union { 3225 char __data[SHA_MESSAGE_BYTES]; 3226 struct { 3227 struct in6_addr secret; 3228 __be32 prefix[2]; 3229 unsigned char hwaddr[MAX_ADDR_LEN]; 3230 u8 dad_count; 3231 } __packed; 3232 } data; 3233 3234 struct in6_addr secret; 3235 struct in6_addr temp; 3236 struct net *net = dev_net(idev->dev); 3237 3238 BUILD_BUG_ON(sizeof(data.__data) != sizeof(data)); 3239 3240 if (idev->cnf.stable_secret.initialized) 3241 secret = idev->cnf.stable_secret.secret; 3242 else if (net->ipv6.devconf_dflt->stable_secret.initialized) 3243 secret = net->ipv6.devconf_dflt->stable_secret.secret; 3244 else 3245 return -1; 3246 3247 retry: 3248 spin_lock_bh(&lock); 3249 3250 sha_init(digest); 3251 memset(&data, 0, sizeof(data)); 3252 memset(workspace, 0, sizeof(workspace)); 3253 memcpy(data.hwaddr, idev->dev->perm_addr, idev->dev->addr_len); 3254 data.prefix[0] = address->s6_addr32[0]; 3255 data.prefix[1] = address->s6_addr32[1]; 3256 data.secret = secret; 3257 data.dad_count = dad_count; 3258 3259 sha_transform(digest, data.__data, workspace); 3260 3261 temp = *address; 3262 temp.s6_addr32[2] = (__force __be32)digest[0]; 3263 temp.s6_addr32[3] = (__force __be32)digest[1]; 3264 3265 spin_unlock_bh(&lock); 3266 3267 if (ipv6_reserved_interfaceid(temp)) { 3268 dad_count++; 3269 if (dad_count > dev_net(idev->dev)->ipv6.sysctl.idgen_retries) 3270 return -1; 3271 goto retry; 3272 } 3273 3274 *address = temp; 3275 return 0; 3276 } 3277 3278 static void ipv6_gen_mode_random_init(struct inet6_dev *idev) 3279 { 3280 struct ipv6_stable_secret *s = &idev->cnf.stable_secret; 3281 3282 if (s->initialized) 3283 return; 3284 s = &idev->cnf.stable_secret; 3285 get_random_bytes(&s->secret, sizeof(s->secret)); 3286 s->initialized = true; 3287 } 3288 3289 static void addrconf_addr_gen(struct inet6_dev *idev, bool prefix_route) 3290 { 3291 struct in6_addr addr; 3292 3293 /* no link local addresses on L3 master devices */ 3294 if (netif_is_l3_master(idev->dev)) 3295 return; 3296 3297 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0); 3298 3299 switch (idev->cnf.addr_gen_mode) { 3300 case IN6_ADDR_GEN_MODE_RANDOM: 3301 ipv6_gen_mode_random_init(idev); 3302 /* fallthrough */ 3303 case IN6_ADDR_GEN_MODE_STABLE_PRIVACY: 3304 if (!ipv6_generate_stable_address(&addr, 0, idev)) 3305 addrconf_add_linklocal(idev, &addr, 3306 IFA_F_STABLE_PRIVACY); 3307 else if (prefix_route) 3308 addrconf_prefix_route(&addr, 64, 0, idev->dev, 3309 0, 0, GFP_KERNEL); 3310 break; 3311 case IN6_ADDR_GEN_MODE_EUI64: 3312 /* addrconf_add_linklocal also adds a prefix_route and we 3313 * only need to care about prefix routes if ipv6_generate_eui64 3314 * couldn't generate one. 3315 */ 3316 if (ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) == 0) 3317 addrconf_add_linklocal(idev, &addr, 0); 3318 else if (prefix_route) 3319 addrconf_prefix_route(&addr, 64, 0, idev->dev, 3320 0, 0, GFP_KERNEL); 3321 break; 3322 case IN6_ADDR_GEN_MODE_NONE: 3323 default: 3324 /* will not add any link local address */ 3325 break; 3326 } 3327 } 3328 3329 static void addrconf_dev_config(struct net_device *dev) 3330 { 3331 struct inet6_dev *idev; 3332 3333 ASSERT_RTNL(); 3334 3335 if ((dev->type != ARPHRD_ETHER) && 3336 (dev->type != ARPHRD_FDDI) && 3337 (dev->type != ARPHRD_ARCNET) && 3338 (dev->type != ARPHRD_INFINIBAND) && 3339 (dev->type != ARPHRD_IEEE1394) && 3340 (dev->type != ARPHRD_TUNNEL6) && 3341 (dev->type != ARPHRD_6LOWPAN) && 3342 (dev->type != ARPHRD_IP6GRE) && 3343 (dev->type != ARPHRD_IPGRE) && 3344 (dev->type != ARPHRD_TUNNEL) && 3345 (dev->type != ARPHRD_NONE) && 3346 (dev->type != ARPHRD_RAWIP)) { 3347 /* Alas, we support only Ethernet autoconfiguration. */ 3348 return; 3349 } 3350 3351 idev = addrconf_add_dev(dev); 3352 if (IS_ERR(idev)) 3353 return; 3354 3355 /* this device type has no EUI support */ 3356 if (dev->type == ARPHRD_NONE && 3357 idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_EUI64) 3358 idev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_RANDOM; 3359 3360 addrconf_addr_gen(idev, false); 3361 } 3362 3363 #if IS_ENABLED(CONFIG_IPV6_SIT) 3364 static void addrconf_sit_config(struct net_device *dev) 3365 { 3366 struct inet6_dev *idev; 3367 3368 ASSERT_RTNL(); 3369 3370 /* 3371 * Configure the tunnel with one of our IPv4 3372 * addresses... we should configure all of 3373 * our v4 addrs in the tunnel 3374 */ 3375 3376 idev = ipv6_find_idev(dev); 3377 if (IS_ERR(idev)) { 3378 pr_debug("%s: add_dev failed\n", __func__); 3379 return; 3380 } 3381 3382 if (dev->priv_flags & IFF_ISATAP) { 3383 addrconf_addr_gen(idev, false); 3384 return; 3385 } 3386 3387 sit_add_v4_addrs(idev); 3388 3389 if (dev->flags&IFF_POINTOPOINT) 3390 addrconf_add_mroute(dev); 3391 } 3392 #endif 3393 3394 #if IS_ENABLED(CONFIG_NET_IPGRE) 3395 static void addrconf_gre_config(struct net_device *dev) 3396 { 3397 struct inet6_dev *idev; 3398 3399 ASSERT_RTNL(); 3400 3401 idev = ipv6_find_idev(dev); 3402 if (IS_ERR(idev)) { 3403 pr_debug("%s: add_dev failed\n", __func__); 3404 return; 3405 } 3406 3407 addrconf_addr_gen(idev, true); 3408 if (dev->flags & IFF_POINTOPOINT) 3409 addrconf_add_mroute(dev); 3410 } 3411 #endif 3412 3413 static int fixup_permanent_addr(struct net *net, 3414 struct inet6_dev *idev, 3415 struct inet6_ifaddr *ifp) 3416 { 3417 /* !fib6_node means the host route was removed from the 3418 * FIB, for example, if 'lo' device is taken down. In that 3419 * case regenerate the host route. 3420 */ 3421 if (!ifp->rt || !ifp->rt->fib6_node) { 3422 struct fib6_info *f6i, *prev; 3423 3424 f6i = addrconf_f6i_alloc(net, idev, &ifp->addr, false, 3425 GFP_ATOMIC); 3426 if (IS_ERR(f6i)) 3427 return PTR_ERR(f6i); 3428 3429 /* ifp->rt can be accessed outside of rtnl */ 3430 spin_lock(&ifp->lock); 3431 prev = ifp->rt; 3432 ifp->rt = f6i; 3433 spin_unlock(&ifp->lock); 3434 3435 fib6_info_release(prev); 3436 } 3437 3438 if (!(ifp->flags & IFA_F_NOPREFIXROUTE)) { 3439 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, 3440 ifp->rt_priority, idev->dev, 0, 0, 3441 GFP_ATOMIC); 3442 } 3443 3444 if (ifp->state == INET6_IFADDR_STATE_PREDAD) 3445 addrconf_dad_start(ifp); 3446 3447 return 0; 3448 } 3449 3450 static void addrconf_permanent_addr(struct net *net, struct net_device *dev) 3451 { 3452 struct inet6_ifaddr *ifp, *tmp; 3453 struct inet6_dev *idev; 3454 3455 idev = __in6_dev_get(dev); 3456 if (!idev) 3457 return; 3458 3459 write_lock_bh(&idev->lock); 3460 3461 list_for_each_entry_safe(ifp, tmp, &idev->addr_list, if_list) { 3462 if ((ifp->flags & IFA_F_PERMANENT) && 3463 fixup_permanent_addr(net, idev, ifp) < 0) { 3464 write_unlock_bh(&idev->lock); 3465 in6_ifa_hold(ifp); 3466 ipv6_del_addr(ifp); 3467 write_lock_bh(&idev->lock); 3468 3469 net_info_ratelimited("%s: Failed to add prefix route for address %pI6c; dropping\n", 3470 idev->dev->name, &ifp->addr); 3471 } 3472 } 3473 3474 write_unlock_bh(&idev->lock); 3475 } 3476 3477 static int addrconf_notify(struct notifier_block *this, unsigned long event, 3478 void *ptr) 3479 { 3480 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 3481 struct netdev_notifier_change_info *change_info; 3482 struct netdev_notifier_changeupper_info *info; 3483 struct inet6_dev *idev = __in6_dev_get(dev); 3484 struct net *net = dev_net(dev); 3485 int run_pending = 0; 3486 int err; 3487 3488 switch (event) { 3489 case NETDEV_REGISTER: 3490 if (!idev && dev->mtu >= IPV6_MIN_MTU) { 3491 idev = ipv6_add_dev(dev); 3492 if (IS_ERR(idev)) 3493 return notifier_from_errno(PTR_ERR(idev)); 3494 } 3495 break; 3496 3497 case NETDEV_CHANGEMTU: 3498 /* if MTU under IPV6_MIN_MTU stop IPv6 on this interface. */ 3499 if (dev->mtu < IPV6_MIN_MTU) { 3500 addrconf_ifdown(dev, dev != net->loopback_dev); 3501 break; 3502 } 3503 3504 if (idev) { 3505 rt6_mtu_change(dev, dev->mtu); 3506 idev->cnf.mtu6 = dev->mtu; 3507 break; 3508 } 3509 3510 /* allocate new idev */ 3511 idev = ipv6_add_dev(dev); 3512 if (IS_ERR(idev)) 3513 break; 3514 3515 /* device is still not ready */ 3516 if (!(idev->if_flags & IF_READY)) 3517 break; 3518 3519 run_pending = 1; 3520 3521 /* fall through */ 3522 3523 case NETDEV_UP: 3524 case NETDEV_CHANGE: 3525 if (dev->flags & IFF_SLAVE) 3526 break; 3527 3528 if (idev && idev->cnf.disable_ipv6) 3529 break; 3530 3531 if (event == NETDEV_UP) { 3532 /* restore routes for permanent addresses */ 3533 addrconf_permanent_addr(net, dev); 3534 3535 if (!addrconf_link_ready(dev)) { 3536 /* device is not ready yet. */ 3537 pr_debug("ADDRCONF(NETDEV_UP): %s: link is not ready\n", 3538 dev->name); 3539 break; 3540 } 3541 3542 if (!idev && dev->mtu >= IPV6_MIN_MTU) 3543 idev = ipv6_add_dev(dev); 3544 3545 if (!IS_ERR_OR_NULL(idev)) { 3546 idev->if_flags |= IF_READY; 3547 run_pending = 1; 3548 } 3549 } else if (event == NETDEV_CHANGE) { 3550 if (!addrconf_link_ready(dev)) { 3551 /* device is still not ready. */ 3552 rt6_sync_down_dev(dev, event); 3553 break; 3554 } 3555 3556 if (!IS_ERR_OR_NULL(idev)) { 3557 if (idev->if_flags & IF_READY) { 3558 /* device is already configured - 3559 * but resend MLD reports, we might 3560 * have roamed and need to update 3561 * multicast snooping switches 3562 */ 3563 ipv6_mc_up(idev); 3564 change_info = ptr; 3565 if (change_info->flags_changed & IFF_NOARP) 3566 addrconf_dad_run(idev, true); 3567 rt6_sync_up(dev, RTNH_F_LINKDOWN); 3568 break; 3569 } 3570 idev->if_flags |= IF_READY; 3571 } 3572 3573 pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n", 3574 dev->name); 3575 3576 run_pending = 1; 3577 } 3578 3579 switch (dev->type) { 3580 #if IS_ENABLED(CONFIG_IPV6_SIT) 3581 case ARPHRD_SIT: 3582 addrconf_sit_config(dev); 3583 break; 3584 #endif 3585 #if IS_ENABLED(CONFIG_NET_IPGRE) 3586 case ARPHRD_IPGRE: 3587 addrconf_gre_config(dev); 3588 break; 3589 #endif 3590 case ARPHRD_LOOPBACK: 3591 init_loopback(dev); 3592 break; 3593 3594 default: 3595 addrconf_dev_config(dev); 3596 break; 3597 } 3598 3599 if (!IS_ERR_OR_NULL(idev)) { 3600 if (run_pending) 3601 addrconf_dad_run(idev, false); 3602 3603 /* Device has an address by now */ 3604 rt6_sync_up(dev, RTNH_F_DEAD); 3605 3606 /* 3607 * If the MTU changed during the interface down, 3608 * when the interface up, the changed MTU must be 3609 * reflected in the idev as well as routers. 3610 */ 3611 if (idev->cnf.mtu6 != dev->mtu && 3612 dev->mtu >= IPV6_MIN_MTU) { 3613 rt6_mtu_change(dev, dev->mtu); 3614 idev->cnf.mtu6 = dev->mtu; 3615 } 3616 idev->tstamp = jiffies; 3617 inet6_ifinfo_notify(RTM_NEWLINK, idev); 3618 3619 /* 3620 * If the changed mtu during down is lower than 3621 * IPV6_MIN_MTU stop IPv6 on this interface. 3622 */ 3623 if (dev->mtu < IPV6_MIN_MTU) 3624 addrconf_ifdown(dev, dev != net->loopback_dev); 3625 } 3626 break; 3627 3628 case NETDEV_DOWN: 3629 case NETDEV_UNREGISTER: 3630 /* 3631 * Remove all addresses from this interface. 3632 */ 3633 addrconf_ifdown(dev, event != NETDEV_DOWN); 3634 break; 3635 3636 case NETDEV_CHANGENAME: 3637 if (idev) { 3638 snmp6_unregister_dev(idev); 3639 addrconf_sysctl_unregister(idev); 3640 err = addrconf_sysctl_register(idev); 3641 if (err) 3642 return notifier_from_errno(err); 3643 err = snmp6_register_dev(idev); 3644 if (err) { 3645 addrconf_sysctl_unregister(idev); 3646 return notifier_from_errno(err); 3647 } 3648 } 3649 break; 3650 3651 case NETDEV_PRE_TYPE_CHANGE: 3652 case NETDEV_POST_TYPE_CHANGE: 3653 if (idev) 3654 addrconf_type_change(dev, event); 3655 break; 3656 3657 case NETDEV_CHANGEUPPER: 3658 info = ptr; 3659 3660 /* flush all routes if dev is linked to or unlinked from 3661 * an L3 master device (e.g., VRF) 3662 */ 3663 if (info->upper_dev && netif_is_l3_master(info->upper_dev)) 3664 addrconf_ifdown(dev, 0); 3665 } 3666 3667 return NOTIFY_OK; 3668 } 3669 3670 /* 3671 * addrconf module should be notified of a device going up 3672 */ 3673 static struct notifier_block ipv6_dev_notf = { 3674 .notifier_call = addrconf_notify, 3675 .priority = ADDRCONF_NOTIFY_PRIORITY, 3676 }; 3677 3678 static void addrconf_type_change(struct net_device *dev, unsigned long event) 3679 { 3680 struct inet6_dev *idev; 3681 ASSERT_RTNL(); 3682 3683 idev = __in6_dev_get(dev); 3684 3685 if (event == NETDEV_POST_TYPE_CHANGE) 3686 ipv6_mc_remap(idev); 3687 else if (event == NETDEV_PRE_TYPE_CHANGE) 3688 ipv6_mc_unmap(idev); 3689 } 3690 3691 static bool addr_is_local(const struct in6_addr *addr) 3692 { 3693 return ipv6_addr_type(addr) & 3694 (IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK); 3695 } 3696 3697 static int addrconf_ifdown(struct net_device *dev, int how) 3698 { 3699 unsigned long event = how ? NETDEV_UNREGISTER : NETDEV_DOWN; 3700 struct net *net = dev_net(dev); 3701 struct inet6_dev *idev; 3702 struct inet6_ifaddr *ifa, *tmp; 3703 bool keep_addr = false; 3704 int state, i; 3705 3706 ASSERT_RTNL(); 3707 3708 rt6_disable_ip(dev, event); 3709 3710 idev = __in6_dev_get(dev); 3711 if (!idev) 3712 return -ENODEV; 3713 3714 /* 3715 * Step 1: remove reference to ipv6 device from parent device. 3716 * Do not dev_put! 3717 */ 3718 if (how) { 3719 idev->dead = 1; 3720 3721 /* protected by rtnl_lock */ 3722 RCU_INIT_POINTER(dev->ip6_ptr, NULL); 3723 3724 /* Step 1.5: remove snmp6 entry */ 3725 snmp6_unregister_dev(idev); 3726 3727 } 3728 3729 /* combine the user config with event to determine if permanent 3730 * addresses are to be removed from address hash table 3731 */ 3732 if (!how && !idev->cnf.disable_ipv6) { 3733 /* aggregate the system setting and interface setting */ 3734 int _keep_addr = net->ipv6.devconf_all->keep_addr_on_down; 3735 3736 if (!_keep_addr) 3737 _keep_addr = idev->cnf.keep_addr_on_down; 3738 3739 keep_addr = (_keep_addr > 0); 3740 } 3741 3742 /* Step 2: clear hash table */ 3743 for (i = 0; i < IN6_ADDR_HSIZE; i++) { 3744 struct hlist_head *h = &inet6_addr_lst[i]; 3745 3746 spin_lock_bh(&addrconf_hash_lock); 3747 restart: 3748 hlist_for_each_entry_rcu(ifa, h, addr_lst) { 3749 if (ifa->idev == idev) { 3750 addrconf_del_dad_work(ifa); 3751 /* combined flag + permanent flag decide if 3752 * address is retained on a down event 3753 */ 3754 if (!keep_addr || 3755 !(ifa->flags & IFA_F_PERMANENT) || 3756 addr_is_local(&ifa->addr)) { 3757 hlist_del_init_rcu(&ifa->addr_lst); 3758 goto restart; 3759 } 3760 } 3761 } 3762 spin_unlock_bh(&addrconf_hash_lock); 3763 } 3764 3765 write_lock_bh(&idev->lock); 3766 3767 addrconf_del_rs_timer(idev); 3768 3769 /* Step 2: clear flags for stateless addrconf */ 3770 if (!how) 3771 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY); 3772 3773 /* Step 3: clear tempaddr list */ 3774 while (!list_empty(&idev->tempaddr_list)) { 3775 ifa = list_first_entry(&idev->tempaddr_list, 3776 struct inet6_ifaddr, tmp_list); 3777 list_del(&ifa->tmp_list); 3778 write_unlock_bh(&idev->lock); 3779 spin_lock_bh(&ifa->lock); 3780 3781 if (ifa->ifpub) { 3782 in6_ifa_put(ifa->ifpub); 3783 ifa->ifpub = NULL; 3784 } 3785 spin_unlock_bh(&ifa->lock); 3786 in6_ifa_put(ifa); 3787 write_lock_bh(&idev->lock); 3788 } 3789 3790 list_for_each_entry_safe(ifa, tmp, &idev->addr_list, if_list) { 3791 struct fib6_info *rt = NULL; 3792 bool keep; 3793 3794 addrconf_del_dad_work(ifa); 3795 3796 keep = keep_addr && (ifa->flags & IFA_F_PERMANENT) && 3797 !addr_is_local(&ifa->addr); 3798 3799 write_unlock_bh(&idev->lock); 3800 spin_lock_bh(&ifa->lock); 3801 3802 if (keep) { 3803 /* set state to skip the notifier below */ 3804 state = INET6_IFADDR_STATE_DEAD; 3805 ifa->state = INET6_IFADDR_STATE_PREDAD; 3806 if (!(ifa->flags & IFA_F_NODAD)) 3807 ifa->flags |= IFA_F_TENTATIVE; 3808 3809 rt = ifa->rt; 3810 ifa->rt = NULL; 3811 } else { 3812 state = ifa->state; 3813 ifa->state = INET6_IFADDR_STATE_DEAD; 3814 } 3815 3816 spin_unlock_bh(&ifa->lock); 3817 3818 if (rt) 3819 ip6_del_rt(net, rt); 3820 3821 if (state != INET6_IFADDR_STATE_DEAD) { 3822 __ipv6_ifa_notify(RTM_DELADDR, ifa); 3823 inet6addr_notifier_call_chain(NETDEV_DOWN, ifa); 3824 } else { 3825 if (idev->cnf.forwarding) 3826 addrconf_leave_anycast(ifa); 3827 addrconf_leave_solict(ifa->idev, &ifa->addr); 3828 } 3829 3830 write_lock_bh(&idev->lock); 3831 if (!keep) { 3832 list_del_rcu(&ifa->if_list); 3833 in6_ifa_put(ifa); 3834 } 3835 } 3836 3837 write_unlock_bh(&idev->lock); 3838 3839 /* Step 5: Discard anycast and multicast list */ 3840 if (how) { 3841 ipv6_ac_destroy_dev(idev); 3842 ipv6_mc_destroy_dev(idev); 3843 } else { 3844 ipv6_mc_down(idev); 3845 } 3846 3847 idev->tstamp = jiffies; 3848 3849 /* Last: Shot the device (if unregistered) */ 3850 if (how) { 3851 addrconf_sysctl_unregister(idev); 3852 neigh_parms_release(&nd_tbl, idev->nd_parms); 3853 neigh_ifdown(&nd_tbl, dev); 3854 in6_dev_put(idev); 3855 } 3856 return 0; 3857 } 3858 3859 static void addrconf_rs_timer(struct timer_list *t) 3860 { 3861 struct inet6_dev *idev = from_timer(idev, t, rs_timer); 3862 struct net_device *dev = idev->dev; 3863 struct in6_addr lladdr; 3864 3865 write_lock(&idev->lock); 3866 if (idev->dead || !(idev->if_flags & IF_READY)) 3867 goto out; 3868 3869 if (!ipv6_accept_ra(idev)) 3870 goto out; 3871 3872 /* Announcement received after solicitation was sent */ 3873 if (idev->if_flags & IF_RA_RCVD) 3874 goto out; 3875 3876 if (idev->rs_probes++ < idev->cnf.rtr_solicits || idev->cnf.rtr_solicits < 0) { 3877 write_unlock(&idev->lock); 3878 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE)) 3879 ndisc_send_rs(dev, &lladdr, 3880 &in6addr_linklocal_allrouters); 3881 else 3882 goto put; 3883 3884 write_lock(&idev->lock); 3885 idev->rs_interval = rfc3315_s14_backoff_update( 3886 idev->rs_interval, idev->cnf.rtr_solicit_max_interval); 3887 /* The wait after the last probe can be shorter */ 3888 addrconf_mod_rs_timer(idev, (idev->rs_probes == 3889 idev->cnf.rtr_solicits) ? 3890 idev->cnf.rtr_solicit_delay : 3891 idev->rs_interval); 3892 } else { 3893 /* 3894 * Note: we do not support deprecated "all on-link" 3895 * assumption any longer. 3896 */ 3897 pr_debug("%s: no IPv6 routers present\n", idev->dev->name); 3898 } 3899 3900 out: 3901 write_unlock(&idev->lock); 3902 put: 3903 in6_dev_put(idev); 3904 } 3905 3906 /* 3907 * Duplicate Address Detection 3908 */ 3909 static void addrconf_dad_kick(struct inet6_ifaddr *ifp) 3910 { 3911 unsigned long rand_num; 3912 struct inet6_dev *idev = ifp->idev; 3913 u64 nonce; 3914 3915 if (ifp->flags & IFA_F_OPTIMISTIC) 3916 rand_num = 0; 3917 else 3918 rand_num = prandom_u32() % (idev->cnf.rtr_solicit_delay ? : 1); 3919 3920 nonce = 0; 3921 if (idev->cnf.enhanced_dad || 3922 dev_net(idev->dev)->ipv6.devconf_all->enhanced_dad) { 3923 do 3924 get_random_bytes(&nonce, 6); 3925 while (nonce == 0); 3926 } 3927 ifp->dad_nonce = nonce; 3928 ifp->dad_probes = idev->cnf.dad_transmits; 3929 addrconf_mod_dad_work(ifp, rand_num); 3930 } 3931 3932 static void addrconf_dad_begin(struct inet6_ifaddr *ifp) 3933 { 3934 struct inet6_dev *idev = ifp->idev; 3935 struct net_device *dev = idev->dev; 3936 bool bump_id, notify = false; 3937 struct net *net; 3938 3939 addrconf_join_solict(dev, &ifp->addr); 3940 3941 prandom_seed((__force u32) ifp->addr.s6_addr32[3]); 3942 3943 read_lock_bh(&idev->lock); 3944 spin_lock(&ifp->lock); 3945 if (ifp->state == INET6_IFADDR_STATE_DEAD) 3946 goto out; 3947 3948 net = dev_net(dev); 3949 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) || 3950 (net->ipv6.devconf_all->accept_dad < 1 && 3951 idev->cnf.accept_dad < 1) || 3952 !(ifp->flags&IFA_F_TENTATIVE) || 3953 ifp->flags & IFA_F_NODAD) { 3954 bool send_na = false; 3955 3956 if (ifp->flags & IFA_F_TENTATIVE && 3957 !(ifp->flags & IFA_F_OPTIMISTIC)) 3958 send_na = true; 3959 bump_id = ifp->flags & IFA_F_TENTATIVE; 3960 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED); 3961 spin_unlock(&ifp->lock); 3962 read_unlock_bh(&idev->lock); 3963 3964 addrconf_dad_completed(ifp, bump_id, send_na); 3965 return; 3966 } 3967 3968 if (!(idev->if_flags & IF_READY)) { 3969 spin_unlock(&ifp->lock); 3970 read_unlock_bh(&idev->lock); 3971 /* 3972 * If the device is not ready: 3973 * - keep it tentative if it is a permanent address. 3974 * - otherwise, kill it. 3975 */ 3976 in6_ifa_hold(ifp); 3977 addrconf_dad_stop(ifp, 0); 3978 return; 3979 } 3980 3981 /* 3982 * Optimistic nodes can start receiving 3983 * Frames right away 3984 */ 3985 if (ifp->flags & IFA_F_OPTIMISTIC) { 3986 ip6_ins_rt(net, ifp->rt); 3987 if (ipv6_use_optimistic_addr(net, idev)) { 3988 /* Because optimistic nodes can use this address, 3989 * notify listeners. If DAD fails, RTM_DELADDR is sent. 3990 */ 3991 notify = true; 3992 } 3993 } 3994 3995 addrconf_dad_kick(ifp); 3996 out: 3997 spin_unlock(&ifp->lock); 3998 read_unlock_bh(&idev->lock); 3999 if (notify) 4000 ipv6_ifa_notify(RTM_NEWADDR, ifp); 4001 } 4002 4003 static void addrconf_dad_start(struct inet6_ifaddr *ifp) 4004 { 4005 bool begin_dad = false; 4006 4007 spin_lock_bh(&ifp->lock); 4008 if (ifp->state != INET6_IFADDR_STATE_DEAD) { 4009 ifp->state = INET6_IFADDR_STATE_PREDAD; 4010 begin_dad = true; 4011 } 4012 spin_unlock_bh(&ifp->lock); 4013 4014 if (begin_dad) 4015 addrconf_mod_dad_work(ifp, 0); 4016 } 4017 4018 static void addrconf_dad_work(struct work_struct *w) 4019 { 4020 struct inet6_ifaddr *ifp = container_of(to_delayed_work(w), 4021 struct inet6_ifaddr, 4022 dad_work); 4023 struct inet6_dev *idev = ifp->idev; 4024 bool bump_id, disable_ipv6 = false; 4025 struct in6_addr mcaddr; 4026 4027 enum { 4028 DAD_PROCESS, 4029 DAD_BEGIN, 4030 DAD_ABORT, 4031 } action = DAD_PROCESS; 4032 4033 rtnl_lock(); 4034 4035 spin_lock_bh(&ifp->lock); 4036 if (ifp->state == INET6_IFADDR_STATE_PREDAD) { 4037 action = DAD_BEGIN; 4038 ifp->state = INET6_IFADDR_STATE_DAD; 4039 } else if (ifp->state == INET6_IFADDR_STATE_ERRDAD) { 4040 action = DAD_ABORT; 4041 ifp->state = INET6_IFADDR_STATE_POSTDAD; 4042 4043 if ((dev_net(idev->dev)->ipv6.devconf_all->accept_dad > 1 || 4044 idev->cnf.accept_dad > 1) && 4045 !idev->cnf.disable_ipv6 && 4046 !(ifp->flags & IFA_F_STABLE_PRIVACY)) { 4047 struct in6_addr addr; 4048 4049 addr.s6_addr32[0] = htonl(0xfe800000); 4050 addr.s6_addr32[1] = 0; 4051 4052 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) && 4053 ipv6_addr_equal(&ifp->addr, &addr)) { 4054 /* DAD failed for link-local based on MAC */ 4055 idev->cnf.disable_ipv6 = 1; 4056 4057 pr_info("%s: IPv6 being disabled!\n", 4058 ifp->idev->dev->name); 4059 disable_ipv6 = true; 4060 } 4061 } 4062 } 4063 spin_unlock_bh(&ifp->lock); 4064 4065 if (action == DAD_BEGIN) { 4066 addrconf_dad_begin(ifp); 4067 goto out; 4068 } else if (action == DAD_ABORT) { 4069 in6_ifa_hold(ifp); 4070 addrconf_dad_stop(ifp, 1); 4071 if (disable_ipv6) 4072 addrconf_ifdown(idev->dev, 0); 4073 goto out; 4074 } 4075 4076 if (!ifp->dad_probes && addrconf_dad_end(ifp)) 4077 goto out; 4078 4079 write_lock_bh(&idev->lock); 4080 if (idev->dead || !(idev->if_flags & IF_READY)) { 4081 write_unlock_bh(&idev->lock); 4082 goto out; 4083 } 4084 4085 spin_lock(&ifp->lock); 4086 if (ifp->state == INET6_IFADDR_STATE_DEAD) { 4087 spin_unlock(&ifp->lock); 4088 write_unlock_bh(&idev->lock); 4089 goto out; 4090 } 4091 4092 if (ifp->dad_probes == 0) { 4093 bool send_na = false; 4094 4095 /* 4096 * DAD was successful 4097 */ 4098 4099 if (ifp->flags & IFA_F_TENTATIVE && 4100 !(ifp->flags & IFA_F_OPTIMISTIC)) 4101 send_na = true; 4102 bump_id = ifp->flags & IFA_F_TENTATIVE; 4103 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED); 4104 spin_unlock(&ifp->lock); 4105 write_unlock_bh(&idev->lock); 4106 4107 addrconf_dad_completed(ifp, bump_id, send_na); 4108 4109 goto out; 4110 } 4111 4112 ifp->dad_probes--; 4113 addrconf_mod_dad_work(ifp, 4114 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME)); 4115 spin_unlock(&ifp->lock); 4116 write_unlock_bh(&idev->lock); 4117 4118 /* send a neighbour solicitation for our addr */ 4119 addrconf_addr_solict_mult(&ifp->addr, &mcaddr); 4120 ndisc_send_ns(ifp->idev->dev, &ifp->addr, &mcaddr, &in6addr_any, 4121 ifp->dad_nonce); 4122 out: 4123 in6_ifa_put(ifp); 4124 rtnl_unlock(); 4125 } 4126 4127 /* ifp->idev must be at least read locked */ 4128 static bool ipv6_lonely_lladdr(struct inet6_ifaddr *ifp) 4129 { 4130 struct inet6_ifaddr *ifpiter; 4131 struct inet6_dev *idev = ifp->idev; 4132 4133 list_for_each_entry_reverse(ifpiter, &idev->addr_list, if_list) { 4134 if (ifpiter->scope > IFA_LINK) 4135 break; 4136 if (ifp != ifpiter && ifpiter->scope == IFA_LINK && 4137 (ifpiter->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE| 4138 IFA_F_OPTIMISTIC|IFA_F_DADFAILED)) == 4139 IFA_F_PERMANENT) 4140 return false; 4141 } 4142 return true; 4143 } 4144 4145 static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id, 4146 bool send_na) 4147 { 4148 struct net_device *dev = ifp->idev->dev; 4149 struct in6_addr lladdr; 4150 bool send_rs, send_mld; 4151 4152 addrconf_del_dad_work(ifp); 4153 4154 /* 4155 * Configure the address for reception. Now it is valid. 4156 */ 4157 4158 ipv6_ifa_notify(RTM_NEWADDR, ifp); 4159 4160 /* If added prefix is link local and we are prepared to process 4161 router advertisements, start sending router solicitations. 4162 */ 4163 4164 read_lock_bh(&ifp->idev->lock); 4165 send_mld = ifp->scope == IFA_LINK && ipv6_lonely_lladdr(ifp); 4166 send_rs = send_mld && 4167 ipv6_accept_ra(ifp->idev) && 4168 ifp->idev->cnf.rtr_solicits != 0 && 4169 (dev->flags&IFF_LOOPBACK) == 0; 4170 read_unlock_bh(&ifp->idev->lock); 4171 4172 /* While dad is in progress mld report's source address is in6_addrany. 4173 * Resend with proper ll now. 4174 */ 4175 if (send_mld) 4176 ipv6_mc_dad_complete(ifp->idev); 4177 4178 /* send unsolicited NA if enabled */ 4179 if (send_na && 4180 (ifp->idev->cnf.ndisc_notify || 4181 dev_net(dev)->ipv6.devconf_all->ndisc_notify)) { 4182 ndisc_send_na(dev, &in6addr_linklocal_allnodes, &ifp->addr, 4183 /*router=*/ !!ifp->idev->cnf.forwarding, 4184 /*solicited=*/ false, /*override=*/ true, 4185 /*inc_opt=*/ true); 4186 } 4187 4188 if (send_rs) { 4189 /* 4190 * If a host as already performed a random delay 4191 * [...] as part of DAD [...] there is no need 4192 * to delay again before sending the first RS 4193 */ 4194 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE)) 4195 return; 4196 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters); 4197 4198 write_lock_bh(&ifp->idev->lock); 4199 spin_lock(&ifp->lock); 4200 ifp->idev->rs_interval = rfc3315_s14_backoff_init( 4201 ifp->idev->cnf.rtr_solicit_interval); 4202 ifp->idev->rs_probes = 1; 4203 ifp->idev->if_flags |= IF_RS_SENT; 4204 addrconf_mod_rs_timer(ifp->idev, ifp->idev->rs_interval); 4205 spin_unlock(&ifp->lock); 4206 write_unlock_bh(&ifp->idev->lock); 4207 } 4208 4209 if (bump_id) 4210 rt_genid_bump_ipv6(dev_net(dev)); 4211 4212 /* Make sure that a new temporary address will be created 4213 * before this temporary address becomes deprecated. 4214 */ 4215 if (ifp->flags & IFA_F_TEMPORARY) 4216 addrconf_verify_rtnl(); 4217 } 4218 4219 static void addrconf_dad_run(struct inet6_dev *idev, bool restart) 4220 { 4221 struct inet6_ifaddr *ifp; 4222 4223 read_lock_bh(&idev->lock); 4224 list_for_each_entry(ifp, &idev->addr_list, if_list) { 4225 spin_lock(&ifp->lock); 4226 if ((ifp->flags & IFA_F_TENTATIVE && 4227 ifp->state == INET6_IFADDR_STATE_DAD) || restart) { 4228 if (restart) 4229 ifp->state = INET6_IFADDR_STATE_PREDAD; 4230 addrconf_dad_kick(ifp); 4231 } 4232 spin_unlock(&ifp->lock); 4233 } 4234 read_unlock_bh(&idev->lock); 4235 } 4236 4237 #ifdef CONFIG_PROC_FS 4238 struct if6_iter_state { 4239 struct seq_net_private p; 4240 int bucket; 4241 int offset; 4242 }; 4243 4244 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos) 4245 { 4246 struct if6_iter_state *state = seq->private; 4247 struct net *net = seq_file_net(seq); 4248 struct inet6_ifaddr *ifa = NULL; 4249 int p = 0; 4250 4251 /* initial bucket if pos is 0 */ 4252 if (pos == 0) { 4253 state->bucket = 0; 4254 state->offset = 0; 4255 } 4256 4257 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) { 4258 hlist_for_each_entry_rcu(ifa, &inet6_addr_lst[state->bucket], 4259 addr_lst) { 4260 if (!net_eq(dev_net(ifa->idev->dev), net)) 4261 continue; 4262 /* sync with offset */ 4263 if (p < state->offset) { 4264 p++; 4265 continue; 4266 } 4267 return ifa; 4268 } 4269 4270 /* prepare for next bucket */ 4271 state->offset = 0; 4272 p = 0; 4273 } 4274 return NULL; 4275 } 4276 4277 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, 4278 struct inet6_ifaddr *ifa) 4279 { 4280 struct if6_iter_state *state = seq->private; 4281 struct net *net = seq_file_net(seq); 4282 4283 hlist_for_each_entry_continue_rcu(ifa, addr_lst) { 4284 if (!net_eq(dev_net(ifa->idev->dev), net)) 4285 continue; 4286 state->offset++; 4287 return ifa; 4288 } 4289 4290 state->offset = 0; 4291 while (++state->bucket < IN6_ADDR_HSIZE) { 4292 hlist_for_each_entry_rcu(ifa, 4293 &inet6_addr_lst[state->bucket], addr_lst) { 4294 if (!net_eq(dev_net(ifa->idev->dev), net)) 4295 continue; 4296 return ifa; 4297 } 4298 } 4299 4300 return NULL; 4301 } 4302 4303 static void *if6_seq_start(struct seq_file *seq, loff_t *pos) 4304 __acquires(rcu) 4305 { 4306 rcu_read_lock(); 4307 return if6_get_first(seq, *pos); 4308 } 4309 4310 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos) 4311 { 4312 struct inet6_ifaddr *ifa; 4313 4314 ifa = if6_get_next(seq, v); 4315 ++*pos; 4316 return ifa; 4317 } 4318 4319 static void if6_seq_stop(struct seq_file *seq, void *v) 4320 __releases(rcu) 4321 { 4322 rcu_read_unlock(); 4323 } 4324 4325 static int if6_seq_show(struct seq_file *seq, void *v) 4326 { 4327 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v; 4328 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n", 4329 &ifp->addr, 4330 ifp->idev->dev->ifindex, 4331 ifp->prefix_len, 4332 ifp->scope, 4333 (u8) ifp->flags, 4334 ifp->idev->dev->name); 4335 return 0; 4336 } 4337 4338 static const struct seq_operations if6_seq_ops = { 4339 .start = if6_seq_start, 4340 .next = if6_seq_next, 4341 .show = if6_seq_show, 4342 .stop = if6_seq_stop, 4343 }; 4344 4345 static int __net_init if6_proc_net_init(struct net *net) 4346 { 4347 if (!proc_create_net("if_inet6", 0444, net->proc_net, &if6_seq_ops, 4348 sizeof(struct if6_iter_state))) 4349 return -ENOMEM; 4350 return 0; 4351 } 4352 4353 static void __net_exit if6_proc_net_exit(struct net *net) 4354 { 4355 remove_proc_entry("if_inet6", net->proc_net); 4356 } 4357 4358 static struct pernet_operations if6_proc_net_ops = { 4359 .init = if6_proc_net_init, 4360 .exit = if6_proc_net_exit, 4361 }; 4362 4363 int __init if6_proc_init(void) 4364 { 4365 return register_pernet_subsys(&if6_proc_net_ops); 4366 } 4367 4368 void if6_proc_exit(void) 4369 { 4370 unregister_pernet_subsys(&if6_proc_net_ops); 4371 } 4372 #endif /* CONFIG_PROC_FS */ 4373 4374 #if IS_ENABLED(CONFIG_IPV6_MIP6) 4375 /* Check if address is a home address configured on any interface. */ 4376 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr) 4377 { 4378 unsigned int hash = inet6_addr_hash(net, addr); 4379 struct inet6_ifaddr *ifp = NULL; 4380 int ret = 0; 4381 4382 rcu_read_lock(); 4383 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) { 4384 if (!net_eq(dev_net(ifp->idev->dev), net)) 4385 continue; 4386 if (ipv6_addr_equal(&ifp->addr, addr) && 4387 (ifp->flags & IFA_F_HOMEADDRESS)) { 4388 ret = 1; 4389 break; 4390 } 4391 } 4392 rcu_read_unlock(); 4393 return ret; 4394 } 4395 #endif 4396 4397 /* 4398 * Periodic address status verification 4399 */ 4400 4401 static void addrconf_verify_rtnl(void) 4402 { 4403 unsigned long now, next, next_sec, next_sched; 4404 struct inet6_ifaddr *ifp; 4405 int i; 4406 4407 ASSERT_RTNL(); 4408 4409 rcu_read_lock_bh(); 4410 now = jiffies; 4411 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY); 4412 4413 cancel_delayed_work(&addr_chk_work); 4414 4415 for (i = 0; i < IN6_ADDR_HSIZE; i++) { 4416 restart: 4417 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[i], addr_lst) { 4418 unsigned long age; 4419 4420 /* When setting preferred_lft to a value not zero or 4421 * infinity, while valid_lft is infinity 4422 * IFA_F_PERMANENT has a non-infinity life time. 4423 */ 4424 if ((ifp->flags & IFA_F_PERMANENT) && 4425 (ifp->prefered_lft == INFINITY_LIFE_TIME)) 4426 continue; 4427 4428 spin_lock(&ifp->lock); 4429 /* We try to batch several events at once. */ 4430 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ; 4431 4432 if (ifp->valid_lft != INFINITY_LIFE_TIME && 4433 age >= ifp->valid_lft) { 4434 spin_unlock(&ifp->lock); 4435 in6_ifa_hold(ifp); 4436 ipv6_del_addr(ifp); 4437 goto restart; 4438 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) { 4439 spin_unlock(&ifp->lock); 4440 continue; 4441 } else if (age >= ifp->prefered_lft) { 4442 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */ 4443 int deprecate = 0; 4444 4445 if (!(ifp->flags&IFA_F_DEPRECATED)) { 4446 deprecate = 1; 4447 ifp->flags |= IFA_F_DEPRECATED; 4448 } 4449 4450 if ((ifp->valid_lft != INFINITY_LIFE_TIME) && 4451 (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))) 4452 next = ifp->tstamp + ifp->valid_lft * HZ; 4453 4454 spin_unlock(&ifp->lock); 4455 4456 if (deprecate) { 4457 in6_ifa_hold(ifp); 4458 4459 ipv6_ifa_notify(0, ifp); 4460 in6_ifa_put(ifp); 4461 goto restart; 4462 } 4463 } else if ((ifp->flags&IFA_F_TEMPORARY) && 4464 !(ifp->flags&IFA_F_TENTATIVE)) { 4465 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry * 4466 ifp->idev->cnf.dad_transmits * 4467 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME) / HZ; 4468 4469 if (age >= ifp->prefered_lft - regen_advance) { 4470 struct inet6_ifaddr *ifpub = ifp->ifpub; 4471 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 4472 next = ifp->tstamp + ifp->prefered_lft * HZ; 4473 if (!ifp->regen_count && ifpub) { 4474 ifp->regen_count++; 4475 in6_ifa_hold(ifp); 4476 in6_ifa_hold(ifpub); 4477 spin_unlock(&ifp->lock); 4478 4479 spin_lock(&ifpub->lock); 4480 ifpub->regen_count = 0; 4481 spin_unlock(&ifpub->lock); 4482 rcu_read_unlock_bh(); 4483 ipv6_create_tempaddr(ifpub, ifp, true); 4484 in6_ifa_put(ifpub); 4485 in6_ifa_put(ifp); 4486 rcu_read_lock_bh(); 4487 goto restart; 4488 } 4489 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next)) 4490 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ; 4491 spin_unlock(&ifp->lock); 4492 } else { 4493 /* ifp->prefered_lft <= ifp->valid_lft */ 4494 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 4495 next = ifp->tstamp + ifp->prefered_lft * HZ; 4496 spin_unlock(&ifp->lock); 4497 } 4498 } 4499 } 4500 4501 next_sec = round_jiffies_up(next); 4502 next_sched = next; 4503 4504 /* If rounded timeout is accurate enough, accept it. */ 4505 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ)) 4506 next_sched = next_sec; 4507 4508 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */ 4509 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX)) 4510 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX; 4511 4512 pr_debug("now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n", 4513 now, next, next_sec, next_sched); 4514 mod_delayed_work(addrconf_wq, &addr_chk_work, next_sched - now); 4515 rcu_read_unlock_bh(); 4516 } 4517 4518 static void addrconf_verify_work(struct work_struct *w) 4519 { 4520 rtnl_lock(); 4521 addrconf_verify_rtnl(); 4522 rtnl_unlock(); 4523 } 4524 4525 static void addrconf_verify(void) 4526 { 4527 mod_delayed_work(addrconf_wq, &addr_chk_work, 0); 4528 } 4529 4530 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local, 4531 struct in6_addr **peer_pfx) 4532 { 4533 struct in6_addr *pfx = NULL; 4534 4535 *peer_pfx = NULL; 4536 4537 if (addr) 4538 pfx = nla_data(addr); 4539 4540 if (local) { 4541 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx))) 4542 *peer_pfx = pfx; 4543 pfx = nla_data(local); 4544 } 4545 4546 return pfx; 4547 } 4548 4549 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = { 4550 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) }, 4551 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) }, 4552 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) }, 4553 [IFA_FLAGS] = { .len = sizeof(u32) }, 4554 [IFA_RT_PRIORITY] = { .len = sizeof(u32) }, 4555 [IFA_TARGET_NETNSID] = { .type = NLA_S32 }, 4556 }; 4557 4558 static int 4559 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, 4560 struct netlink_ext_ack *extack) 4561 { 4562 struct net *net = sock_net(skb->sk); 4563 struct ifaddrmsg *ifm; 4564 struct nlattr *tb[IFA_MAX+1]; 4565 struct in6_addr *pfx, *peer_pfx; 4566 u32 ifa_flags; 4567 int err; 4568 4569 err = nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX, 4570 ifa_ipv6_policy, extack); 4571 if (err < 0) 4572 return err; 4573 4574 ifm = nlmsg_data(nlh); 4575 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx); 4576 if (!pfx) 4577 return -EINVAL; 4578 4579 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags; 4580 4581 /* We ignore other flags so far. */ 4582 ifa_flags &= IFA_F_MANAGETEMPADDR; 4583 4584 return inet6_addr_del(net, ifm->ifa_index, ifa_flags, pfx, 4585 ifm->ifa_prefixlen); 4586 } 4587 4588 static int modify_prefix_route(struct inet6_ifaddr *ifp, 4589 unsigned long expires, u32 flags) 4590 { 4591 struct fib6_info *f6i; 4592 u32 prio; 4593 4594 f6i = addrconf_get_prefix_route(&ifp->addr, ifp->prefix_len, 4595 ifp->idev->dev, 0, RTF_DEFAULT, true); 4596 if (!f6i) 4597 return -ENOENT; 4598 4599 prio = ifp->rt_priority ? : IP6_RT_PRIO_ADDRCONF; 4600 if (f6i->fib6_metric != prio) { 4601 /* delete old one */ 4602 ip6_del_rt(dev_net(ifp->idev->dev), f6i); 4603 4604 /* add new one */ 4605 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, 4606 ifp->rt_priority, ifp->idev->dev, 4607 expires, flags, GFP_KERNEL); 4608 } else { 4609 if (!expires) 4610 fib6_clean_expires(f6i); 4611 else 4612 fib6_set_expires(f6i, expires); 4613 4614 fib6_info_release(f6i); 4615 } 4616 4617 return 0; 4618 } 4619 4620 static int inet6_addr_modify(struct inet6_ifaddr *ifp, struct ifa6_config *cfg) 4621 { 4622 u32 flags; 4623 clock_t expires; 4624 unsigned long timeout; 4625 bool was_managetempaddr; 4626 bool had_prefixroute; 4627 4628 ASSERT_RTNL(); 4629 4630 if (!cfg->valid_lft || cfg->preferred_lft > cfg->valid_lft) 4631 return -EINVAL; 4632 4633 if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR && 4634 (ifp->flags & IFA_F_TEMPORARY || ifp->prefix_len != 64)) 4635 return -EINVAL; 4636 4637 if (!(ifp->flags & IFA_F_TENTATIVE) || ifp->flags & IFA_F_DADFAILED) 4638 cfg->ifa_flags &= ~IFA_F_OPTIMISTIC; 4639 4640 timeout = addrconf_timeout_fixup(cfg->valid_lft, HZ); 4641 if (addrconf_finite_timeout(timeout)) { 4642 expires = jiffies_to_clock_t(timeout * HZ); 4643 cfg->valid_lft = timeout; 4644 flags = RTF_EXPIRES; 4645 } else { 4646 expires = 0; 4647 flags = 0; 4648 cfg->ifa_flags |= IFA_F_PERMANENT; 4649 } 4650 4651 timeout = addrconf_timeout_fixup(cfg->preferred_lft, HZ); 4652 if (addrconf_finite_timeout(timeout)) { 4653 if (timeout == 0) 4654 cfg->ifa_flags |= IFA_F_DEPRECATED; 4655 cfg->preferred_lft = timeout; 4656 } 4657 4658 spin_lock_bh(&ifp->lock); 4659 was_managetempaddr = ifp->flags & IFA_F_MANAGETEMPADDR; 4660 had_prefixroute = ifp->flags & IFA_F_PERMANENT && 4661 !(ifp->flags & IFA_F_NOPREFIXROUTE); 4662 ifp->flags &= ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | 4663 IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR | 4664 IFA_F_NOPREFIXROUTE); 4665 ifp->flags |= cfg->ifa_flags; 4666 ifp->tstamp = jiffies; 4667 ifp->valid_lft = cfg->valid_lft; 4668 ifp->prefered_lft = cfg->preferred_lft; 4669 4670 if (cfg->rt_priority && cfg->rt_priority != ifp->rt_priority) 4671 ifp->rt_priority = cfg->rt_priority; 4672 4673 spin_unlock_bh(&ifp->lock); 4674 if (!(ifp->flags&IFA_F_TENTATIVE)) 4675 ipv6_ifa_notify(0, ifp); 4676 4677 if (!(cfg->ifa_flags & IFA_F_NOPREFIXROUTE)) { 4678 int rc = -ENOENT; 4679 4680 if (had_prefixroute) 4681 rc = modify_prefix_route(ifp, expires, flags); 4682 4683 /* prefix route could have been deleted; if so restore it */ 4684 if (rc == -ENOENT) { 4685 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, 4686 ifp->rt_priority, ifp->idev->dev, 4687 expires, flags, GFP_KERNEL); 4688 } 4689 } else if (had_prefixroute) { 4690 enum cleanup_prefix_rt_t action; 4691 unsigned long rt_expires; 4692 4693 write_lock_bh(&ifp->idev->lock); 4694 action = check_cleanup_prefix_route(ifp, &rt_expires); 4695 write_unlock_bh(&ifp->idev->lock); 4696 4697 if (action != CLEANUP_PREFIX_RT_NOP) { 4698 cleanup_prefix_route(ifp, rt_expires, 4699 action == CLEANUP_PREFIX_RT_DEL); 4700 } 4701 } 4702 4703 if (was_managetempaddr || ifp->flags & IFA_F_MANAGETEMPADDR) { 4704 if (was_managetempaddr && 4705 !(ifp->flags & IFA_F_MANAGETEMPADDR)) { 4706 cfg->valid_lft = 0; 4707 cfg->preferred_lft = 0; 4708 } 4709 manage_tempaddrs(ifp->idev, ifp, cfg->valid_lft, 4710 cfg->preferred_lft, !was_managetempaddr, 4711 jiffies); 4712 } 4713 4714 addrconf_verify_rtnl(); 4715 4716 return 0; 4717 } 4718 4719 static int 4720 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, 4721 struct netlink_ext_ack *extack) 4722 { 4723 struct net *net = sock_net(skb->sk); 4724 struct ifaddrmsg *ifm; 4725 struct nlattr *tb[IFA_MAX+1]; 4726 struct in6_addr *peer_pfx; 4727 struct inet6_ifaddr *ifa; 4728 struct net_device *dev; 4729 struct inet6_dev *idev; 4730 struct ifa6_config cfg; 4731 int err; 4732 4733 err = nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX, 4734 ifa_ipv6_policy, extack); 4735 if (err < 0) 4736 return err; 4737 4738 memset(&cfg, 0, sizeof(cfg)); 4739 4740 ifm = nlmsg_data(nlh); 4741 cfg.pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx); 4742 if (!cfg.pfx) 4743 return -EINVAL; 4744 4745 cfg.peer_pfx = peer_pfx; 4746 cfg.plen = ifm->ifa_prefixlen; 4747 if (tb[IFA_RT_PRIORITY]) 4748 cfg.rt_priority = nla_get_u32(tb[IFA_RT_PRIORITY]); 4749 4750 cfg.valid_lft = INFINITY_LIFE_TIME; 4751 cfg.preferred_lft = INFINITY_LIFE_TIME; 4752 4753 if (tb[IFA_CACHEINFO]) { 4754 struct ifa_cacheinfo *ci; 4755 4756 ci = nla_data(tb[IFA_CACHEINFO]); 4757 cfg.valid_lft = ci->ifa_valid; 4758 cfg.preferred_lft = ci->ifa_prefered; 4759 } 4760 4761 dev = __dev_get_by_index(net, ifm->ifa_index); 4762 if (!dev) 4763 return -ENODEV; 4764 4765 if (tb[IFA_FLAGS]) 4766 cfg.ifa_flags = nla_get_u32(tb[IFA_FLAGS]); 4767 else 4768 cfg.ifa_flags = ifm->ifa_flags; 4769 4770 /* We ignore other flags so far. */ 4771 cfg.ifa_flags &= IFA_F_NODAD | IFA_F_HOMEADDRESS | 4772 IFA_F_MANAGETEMPADDR | IFA_F_NOPREFIXROUTE | 4773 IFA_F_MCAUTOJOIN | IFA_F_OPTIMISTIC; 4774 4775 idev = ipv6_find_idev(dev); 4776 if (IS_ERR(idev)) 4777 return PTR_ERR(idev); 4778 4779 if (!ipv6_allow_optimistic_dad(net, idev)) 4780 cfg.ifa_flags &= ~IFA_F_OPTIMISTIC; 4781 4782 if (cfg.ifa_flags & IFA_F_NODAD && 4783 cfg.ifa_flags & IFA_F_OPTIMISTIC) { 4784 NL_SET_ERR_MSG(extack, "IFA_F_NODAD and IFA_F_OPTIMISTIC are mutually exclusive"); 4785 return -EINVAL; 4786 } 4787 4788 ifa = ipv6_get_ifaddr(net, cfg.pfx, dev, 1); 4789 if (!ifa) { 4790 /* 4791 * It would be best to check for !NLM_F_CREATE here but 4792 * userspace already relies on not having to provide this. 4793 */ 4794 return inet6_addr_add(net, ifm->ifa_index, &cfg, extack); 4795 } 4796 4797 if (nlh->nlmsg_flags & NLM_F_EXCL || 4798 !(nlh->nlmsg_flags & NLM_F_REPLACE)) 4799 err = -EEXIST; 4800 else 4801 err = inet6_addr_modify(ifa, &cfg); 4802 4803 in6_ifa_put(ifa); 4804 4805 return err; 4806 } 4807 4808 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u32 flags, 4809 u8 scope, int ifindex) 4810 { 4811 struct ifaddrmsg *ifm; 4812 4813 ifm = nlmsg_data(nlh); 4814 ifm->ifa_family = AF_INET6; 4815 ifm->ifa_prefixlen = prefixlen; 4816 ifm->ifa_flags = flags; 4817 ifm->ifa_scope = scope; 4818 ifm->ifa_index = ifindex; 4819 } 4820 4821 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp, 4822 unsigned long tstamp, u32 preferred, u32 valid) 4823 { 4824 struct ifa_cacheinfo ci; 4825 4826 ci.cstamp = cstamp_delta(cstamp); 4827 ci.tstamp = cstamp_delta(tstamp); 4828 ci.ifa_prefered = preferred; 4829 ci.ifa_valid = valid; 4830 4831 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci); 4832 } 4833 4834 static inline int rt_scope(int ifa_scope) 4835 { 4836 if (ifa_scope & IFA_HOST) 4837 return RT_SCOPE_HOST; 4838 else if (ifa_scope & IFA_LINK) 4839 return RT_SCOPE_LINK; 4840 else if (ifa_scope & IFA_SITE) 4841 return RT_SCOPE_SITE; 4842 else 4843 return RT_SCOPE_UNIVERSE; 4844 } 4845 4846 static inline int inet6_ifaddr_msgsize(void) 4847 { 4848 return NLMSG_ALIGN(sizeof(struct ifaddrmsg)) 4849 + nla_total_size(16) /* IFA_LOCAL */ 4850 + nla_total_size(16) /* IFA_ADDRESS */ 4851 + nla_total_size(sizeof(struct ifa_cacheinfo)) 4852 + nla_total_size(4) /* IFA_FLAGS */ 4853 + nla_total_size(4) /* IFA_RT_PRIORITY */; 4854 } 4855 4856 enum addr_type_t { 4857 UNICAST_ADDR, 4858 MULTICAST_ADDR, 4859 ANYCAST_ADDR, 4860 }; 4861 4862 struct inet6_fill_args { 4863 u32 portid; 4864 u32 seq; 4865 int event; 4866 unsigned int flags; 4867 int netnsid; 4868 int ifindex; 4869 enum addr_type_t type; 4870 }; 4871 4872 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa, 4873 struct inet6_fill_args *args) 4874 { 4875 struct nlmsghdr *nlh; 4876 u32 preferred, valid; 4877 4878 nlh = nlmsg_put(skb, args->portid, args->seq, args->event, 4879 sizeof(struct ifaddrmsg), args->flags); 4880 if (!nlh) 4881 return -EMSGSIZE; 4882 4883 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope), 4884 ifa->idev->dev->ifindex); 4885 4886 if (args->netnsid >= 0 && 4887 nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid)) 4888 goto error; 4889 4890 if (!((ifa->flags&IFA_F_PERMANENT) && 4891 (ifa->prefered_lft == INFINITY_LIFE_TIME))) { 4892 preferred = ifa->prefered_lft; 4893 valid = ifa->valid_lft; 4894 if (preferred != INFINITY_LIFE_TIME) { 4895 long tval = (jiffies - ifa->tstamp)/HZ; 4896 if (preferred > tval) 4897 preferred -= tval; 4898 else 4899 preferred = 0; 4900 if (valid != INFINITY_LIFE_TIME) { 4901 if (valid > tval) 4902 valid -= tval; 4903 else 4904 valid = 0; 4905 } 4906 } 4907 } else { 4908 preferred = INFINITY_LIFE_TIME; 4909 valid = INFINITY_LIFE_TIME; 4910 } 4911 4912 if (!ipv6_addr_any(&ifa->peer_addr)) { 4913 if (nla_put_in6_addr(skb, IFA_LOCAL, &ifa->addr) < 0 || 4914 nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->peer_addr) < 0) 4915 goto error; 4916 } else 4917 if (nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->addr) < 0) 4918 goto error; 4919 4920 if (ifa->rt_priority && 4921 nla_put_u32(skb, IFA_RT_PRIORITY, ifa->rt_priority)) 4922 goto error; 4923 4924 if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) 4925 goto error; 4926 4927 if (nla_put_u32(skb, IFA_FLAGS, ifa->flags) < 0) 4928 goto error; 4929 4930 nlmsg_end(skb, nlh); 4931 return 0; 4932 4933 error: 4934 nlmsg_cancel(skb, nlh); 4935 return -EMSGSIZE; 4936 } 4937 4938 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca, 4939 struct inet6_fill_args *args) 4940 { 4941 struct nlmsghdr *nlh; 4942 u8 scope = RT_SCOPE_UNIVERSE; 4943 int ifindex = ifmca->idev->dev->ifindex; 4944 4945 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE) 4946 scope = RT_SCOPE_SITE; 4947 4948 nlh = nlmsg_put(skb, args->portid, args->seq, args->event, 4949 sizeof(struct ifaddrmsg), args->flags); 4950 if (!nlh) 4951 return -EMSGSIZE; 4952 4953 if (args->netnsid >= 0 && 4954 nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid)) 4955 return -EMSGSIZE; 4956 4957 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 4958 if (nla_put_in6_addr(skb, IFA_MULTICAST, &ifmca->mca_addr) < 0 || 4959 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp, 4960 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 4961 nlmsg_cancel(skb, nlh); 4962 return -EMSGSIZE; 4963 } 4964 4965 nlmsg_end(skb, nlh); 4966 return 0; 4967 } 4968 4969 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca, 4970 struct inet6_fill_args *args) 4971 { 4972 struct net_device *dev = fib6_info_nh_dev(ifaca->aca_rt); 4973 int ifindex = dev ? dev->ifindex : 1; 4974 struct nlmsghdr *nlh; 4975 u8 scope = RT_SCOPE_UNIVERSE; 4976 4977 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE) 4978 scope = RT_SCOPE_SITE; 4979 4980 nlh = nlmsg_put(skb, args->portid, args->seq, args->event, 4981 sizeof(struct ifaddrmsg), args->flags); 4982 if (!nlh) 4983 return -EMSGSIZE; 4984 4985 if (args->netnsid >= 0 && 4986 nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid)) 4987 return -EMSGSIZE; 4988 4989 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 4990 if (nla_put_in6_addr(skb, IFA_ANYCAST, &ifaca->aca_addr) < 0 || 4991 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp, 4992 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 4993 nlmsg_cancel(skb, nlh); 4994 return -EMSGSIZE; 4995 } 4996 4997 nlmsg_end(skb, nlh); 4998 return 0; 4999 } 5000 5001 /* called with rcu_read_lock() */ 5002 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb, 5003 struct netlink_callback *cb, int s_ip_idx, 5004 struct inet6_fill_args *fillargs) 5005 { 5006 struct ifmcaddr6 *ifmca; 5007 struct ifacaddr6 *ifaca; 5008 int ip_idx = 0; 5009 int err = 1; 5010 5011 read_lock_bh(&idev->lock); 5012 switch (fillargs->type) { 5013 case UNICAST_ADDR: { 5014 struct inet6_ifaddr *ifa; 5015 fillargs->event = RTM_NEWADDR; 5016 5017 /* unicast address incl. temp addr */ 5018 list_for_each_entry(ifa, &idev->addr_list, if_list) { 5019 if (ip_idx < s_ip_idx) 5020 goto next; 5021 err = inet6_fill_ifaddr(skb, ifa, fillargs); 5022 if (err < 0) 5023 break; 5024 nl_dump_check_consistent(cb, nlmsg_hdr(skb)); 5025 next: 5026 ip_idx++; 5027 } 5028 break; 5029 } 5030 case MULTICAST_ADDR: 5031 fillargs->event = RTM_GETMULTICAST; 5032 5033 /* multicast address */ 5034 for (ifmca = idev->mc_list; ifmca; 5035 ifmca = ifmca->next, ip_idx++) { 5036 if (ip_idx < s_ip_idx) 5037 continue; 5038 err = inet6_fill_ifmcaddr(skb, ifmca, fillargs); 5039 if (err < 0) 5040 break; 5041 } 5042 break; 5043 case ANYCAST_ADDR: 5044 fillargs->event = RTM_GETANYCAST; 5045 /* anycast address */ 5046 for (ifaca = idev->ac_list; ifaca; 5047 ifaca = ifaca->aca_next, ip_idx++) { 5048 if (ip_idx < s_ip_idx) 5049 continue; 5050 err = inet6_fill_ifacaddr(skb, ifaca, fillargs); 5051 if (err < 0) 5052 break; 5053 } 5054 break; 5055 default: 5056 break; 5057 } 5058 read_unlock_bh(&idev->lock); 5059 cb->args[2] = ip_idx; 5060 return err; 5061 } 5062 5063 static int inet6_valid_dump_ifaddr_req(const struct nlmsghdr *nlh, 5064 struct inet6_fill_args *fillargs, 5065 struct net **tgt_net, struct sock *sk, 5066 struct netlink_callback *cb) 5067 { 5068 struct netlink_ext_ack *extack = cb->extack; 5069 struct nlattr *tb[IFA_MAX+1]; 5070 struct ifaddrmsg *ifm; 5071 int err, i; 5072 5073 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) { 5074 NL_SET_ERR_MSG_MOD(extack, "Invalid header for address dump request"); 5075 return -EINVAL; 5076 } 5077 5078 ifm = nlmsg_data(nlh); 5079 if (ifm->ifa_prefixlen || ifm->ifa_flags || ifm->ifa_scope) { 5080 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for address dump request"); 5081 return -EINVAL; 5082 } 5083 5084 fillargs->ifindex = ifm->ifa_index; 5085 if (fillargs->ifindex) { 5086 cb->answer_flags |= NLM_F_DUMP_FILTERED; 5087 fillargs->flags |= NLM_F_DUMP_FILTERED; 5088 } 5089 5090 err = nlmsg_parse_deprecated_strict(nlh, sizeof(*ifm), tb, IFA_MAX, 5091 ifa_ipv6_policy, extack); 5092 if (err < 0) 5093 return err; 5094 5095 for (i = 0; i <= IFA_MAX; ++i) { 5096 if (!tb[i]) 5097 continue; 5098 5099 if (i == IFA_TARGET_NETNSID) { 5100 struct net *net; 5101 5102 fillargs->netnsid = nla_get_s32(tb[i]); 5103 net = rtnl_get_net_ns_capable(sk, fillargs->netnsid); 5104 if (IS_ERR(net)) { 5105 fillargs->netnsid = -1; 5106 NL_SET_ERR_MSG_MOD(extack, "Invalid target network namespace id"); 5107 return PTR_ERR(net); 5108 } 5109 *tgt_net = net; 5110 } else { 5111 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in dump request"); 5112 return -EINVAL; 5113 } 5114 } 5115 5116 return 0; 5117 } 5118 5119 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb, 5120 enum addr_type_t type) 5121 { 5122 const struct nlmsghdr *nlh = cb->nlh; 5123 struct inet6_fill_args fillargs = { 5124 .portid = NETLINK_CB(cb->skb).portid, 5125 .seq = cb->nlh->nlmsg_seq, 5126 .flags = NLM_F_MULTI, 5127 .netnsid = -1, 5128 .type = type, 5129 }; 5130 struct net *net = sock_net(skb->sk); 5131 struct net *tgt_net = net; 5132 int idx, s_idx, s_ip_idx; 5133 int h, s_h; 5134 struct net_device *dev; 5135 struct inet6_dev *idev; 5136 struct hlist_head *head; 5137 int err = 0; 5138 5139 s_h = cb->args[0]; 5140 s_idx = idx = cb->args[1]; 5141 s_ip_idx = cb->args[2]; 5142 5143 if (cb->strict_check) { 5144 err = inet6_valid_dump_ifaddr_req(nlh, &fillargs, &tgt_net, 5145 skb->sk, cb); 5146 if (err < 0) 5147 goto put_tgt_net; 5148 5149 err = 0; 5150 if (fillargs.ifindex) { 5151 dev = __dev_get_by_index(tgt_net, fillargs.ifindex); 5152 if (!dev) { 5153 err = -ENODEV; 5154 goto put_tgt_net; 5155 } 5156 idev = __in6_dev_get(dev); 5157 if (idev) { 5158 err = in6_dump_addrs(idev, skb, cb, s_ip_idx, 5159 &fillargs); 5160 if (err > 0) 5161 err = 0; 5162 } 5163 goto put_tgt_net; 5164 } 5165 } 5166 5167 rcu_read_lock(); 5168 cb->seq = atomic_read(&tgt_net->ipv6.dev_addr_genid) ^ tgt_net->dev_base_seq; 5169 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 5170 idx = 0; 5171 head = &tgt_net->dev_index_head[h]; 5172 hlist_for_each_entry_rcu(dev, head, index_hlist) { 5173 if (idx < s_idx) 5174 goto cont; 5175 if (h > s_h || idx > s_idx) 5176 s_ip_idx = 0; 5177 idev = __in6_dev_get(dev); 5178 if (!idev) 5179 goto cont; 5180 5181 if (in6_dump_addrs(idev, skb, cb, s_ip_idx, 5182 &fillargs) < 0) 5183 goto done; 5184 cont: 5185 idx++; 5186 } 5187 } 5188 done: 5189 rcu_read_unlock(); 5190 cb->args[0] = h; 5191 cb->args[1] = idx; 5192 put_tgt_net: 5193 if (fillargs.netnsid >= 0) 5194 put_net(tgt_net); 5195 5196 return skb->len ? : err; 5197 } 5198 5199 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb) 5200 { 5201 enum addr_type_t type = UNICAST_ADDR; 5202 5203 return inet6_dump_addr(skb, cb, type); 5204 } 5205 5206 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb) 5207 { 5208 enum addr_type_t type = MULTICAST_ADDR; 5209 5210 return inet6_dump_addr(skb, cb, type); 5211 } 5212 5213 5214 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb) 5215 { 5216 enum addr_type_t type = ANYCAST_ADDR; 5217 5218 return inet6_dump_addr(skb, cb, type); 5219 } 5220 5221 static int inet6_rtm_valid_getaddr_req(struct sk_buff *skb, 5222 const struct nlmsghdr *nlh, 5223 struct nlattr **tb, 5224 struct netlink_ext_ack *extack) 5225 { 5226 struct ifaddrmsg *ifm; 5227 int i, err; 5228 5229 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) { 5230 NL_SET_ERR_MSG_MOD(extack, "Invalid header for get address request"); 5231 return -EINVAL; 5232 } 5233 5234 ifm = nlmsg_data(nlh); 5235 if (ifm->ifa_prefixlen || ifm->ifa_flags || ifm->ifa_scope) { 5236 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for get address request"); 5237 return -EINVAL; 5238 } 5239 5240 if (!netlink_strict_get_check(skb)) 5241 return nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX, 5242 ifa_ipv6_policy, extack); 5243 5244 err = nlmsg_parse_deprecated_strict(nlh, sizeof(*ifm), tb, IFA_MAX, 5245 ifa_ipv6_policy, extack); 5246 if (err) 5247 return err; 5248 5249 for (i = 0; i <= IFA_MAX; i++) { 5250 if (!tb[i]) 5251 continue; 5252 5253 switch (i) { 5254 case IFA_TARGET_NETNSID: 5255 case IFA_ADDRESS: 5256 case IFA_LOCAL: 5257 break; 5258 default: 5259 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in get address request"); 5260 return -EINVAL; 5261 } 5262 } 5263 5264 return 0; 5265 } 5266 5267 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh, 5268 struct netlink_ext_ack *extack) 5269 { 5270 struct net *net = sock_net(in_skb->sk); 5271 struct inet6_fill_args fillargs = { 5272 .portid = NETLINK_CB(in_skb).portid, 5273 .seq = nlh->nlmsg_seq, 5274 .event = RTM_NEWADDR, 5275 .flags = 0, 5276 .netnsid = -1, 5277 }; 5278 struct net *tgt_net = net; 5279 struct ifaddrmsg *ifm; 5280 struct nlattr *tb[IFA_MAX+1]; 5281 struct in6_addr *addr = NULL, *peer; 5282 struct net_device *dev = NULL; 5283 struct inet6_ifaddr *ifa; 5284 struct sk_buff *skb; 5285 int err; 5286 5287 err = inet6_rtm_valid_getaddr_req(in_skb, nlh, tb, extack); 5288 if (err < 0) 5289 return err; 5290 5291 if (tb[IFA_TARGET_NETNSID]) { 5292 fillargs.netnsid = nla_get_s32(tb[IFA_TARGET_NETNSID]); 5293 5294 tgt_net = rtnl_get_net_ns_capable(NETLINK_CB(in_skb).sk, 5295 fillargs.netnsid); 5296 if (IS_ERR(tgt_net)) 5297 return PTR_ERR(tgt_net); 5298 } 5299 5300 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer); 5301 if (!addr) 5302 return -EINVAL; 5303 5304 ifm = nlmsg_data(nlh); 5305 if (ifm->ifa_index) 5306 dev = dev_get_by_index(tgt_net, ifm->ifa_index); 5307 5308 ifa = ipv6_get_ifaddr(tgt_net, addr, dev, 1); 5309 if (!ifa) { 5310 err = -EADDRNOTAVAIL; 5311 goto errout; 5312 } 5313 5314 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL); 5315 if (!skb) { 5316 err = -ENOBUFS; 5317 goto errout_ifa; 5318 } 5319 5320 err = inet6_fill_ifaddr(skb, ifa, &fillargs); 5321 if (err < 0) { 5322 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 5323 WARN_ON(err == -EMSGSIZE); 5324 kfree_skb(skb); 5325 goto errout_ifa; 5326 } 5327 err = rtnl_unicast(skb, tgt_net, NETLINK_CB(in_skb).portid); 5328 errout_ifa: 5329 in6_ifa_put(ifa); 5330 errout: 5331 if (dev) 5332 dev_put(dev); 5333 if (fillargs.netnsid >= 0) 5334 put_net(tgt_net); 5335 5336 return err; 5337 } 5338 5339 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa) 5340 { 5341 struct sk_buff *skb; 5342 struct net *net = dev_net(ifa->idev->dev); 5343 struct inet6_fill_args fillargs = { 5344 .portid = 0, 5345 .seq = 0, 5346 .event = event, 5347 .flags = 0, 5348 .netnsid = -1, 5349 }; 5350 int err = -ENOBUFS; 5351 5352 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC); 5353 if (!skb) 5354 goto errout; 5355 5356 err = inet6_fill_ifaddr(skb, ifa, &fillargs); 5357 if (err < 0) { 5358 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 5359 WARN_ON(err == -EMSGSIZE); 5360 kfree_skb(skb); 5361 goto errout; 5362 } 5363 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC); 5364 return; 5365 errout: 5366 if (err < 0) 5367 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err); 5368 } 5369 5370 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf, 5371 __s32 *array, int bytes) 5372 { 5373 BUG_ON(bytes < (DEVCONF_MAX * 4)); 5374 5375 memset(array, 0, bytes); 5376 array[DEVCONF_FORWARDING] = cnf->forwarding; 5377 array[DEVCONF_HOPLIMIT] = cnf->hop_limit; 5378 array[DEVCONF_MTU6] = cnf->mtu6; 5379 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra; 5380 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects; 5381 array[DEVCONF_AUTOCONF] = cnf->autoconf; 5382 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits; 5383 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits; 5384 array[DEVCONF_RTR_SOLICIT_INTERVAL] = 5385 jiffies_to_msecs(cnf->rtr_solicit_interval); 5386 array[DEVCONF_RTR_SOLICIT_MAX_INTERVAL] = 5387 jiffies_to_msecs(cnf->rtr_solicit_max_interval); 5388 array[DEVCONF_RTR_SOLICIT_DELAY] = 5389 jiffies_to_msecs(cnf->rtr_solicit_delay); 5390 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version; 5391 array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] = 5392 jiffies_to_msecs(cnf->mldv1_unsolicited_report_interval); 5393 array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] = 5394 jiffies_to_msecs(cnf->mldv2_unsolicited_report_interval); 5395 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr; 5396 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft; 5397 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft; 5398 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry; 5399 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor; 5400 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses; 5401 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr; 5402 array[DEVCONF_ACCEPT_RA_MIN_HOP_LIMIT] = cnf->accept_ra_min_hop_limit; 5403 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo; 5404 #ifdef CONFIG_IPV6_ROUTER_PREF 5405 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref; 5406 array[DEVCONF_RTR_PROBE_INTERVAL] = 5407 jiffies_to_msecs(cnf->rtr_probe_interval); 5408 #ifdef CONFIG_IPV6_ROUTE_INFO 5409 array[DEVCONF_ACCEPT_RA_RT_INFO_MIN_PLEN] = cnf->accept_ra_rt_info_min_plen; 5410 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen; 5411 #endif 5412 #endif 5413 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp; 5414 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route; 5415 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 5416 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad; 5417 array[DEVCONF_USE_OPTIMISTIC] = cnf->use_optimistic; 5418 #endif 5419 #ifdef CONFIG_IPV6_MROUTE 5420 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding; 5421 #endif 5422 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6; 5423 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad; 5424 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao; 5425 array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify; 5426 array[DEVCONF_SUPPRESS_FRAG_NDISC] = cnf->suppress_frag_ndisc; 5427 array[DEVCONF_ACCEPT_RA_FROM_LOCAL] = cnf->accept_ra_from_local; 5428 array[DEVCONF_ACCEPT_RA_MTU] = cnf->accept_ra_mtu; 5429 array[DEVCONF_IGNORE_ROUTES_WITH_LINKDOWN] = cnf->ignore_routes_with_linkdown; 5430 /* we omit DEVCONF_STABLE_SECRET for now */ 5431 array[DEVCONF_USE_OIF_ADDRS_ONLY] = cnf->use_oif_addrs_only; 5432 array[DEVCONF_DROP_UNICAST_IN_L2_MULTICAST] = cnf->drop_unicast_in_l2_multicast; 5433 array[DEVCONF_DROP_UNSOLICITED_NA] = cnf->drop_unsolicited_na; 5434 array[DEVCONF_KEEP_ADDR_ON_DOWN] = cnf->keep_addr_on_down; 5435 array[DEVCONF_SEG6_ENABLED] = cnf->seg6_enabled; 5436 #ifdef CONFIG_IPV6_SEG6_HMAC 5437 array[DEVCONF_SEG6_REQUIRE_HMAC] = cnf->seg6_require_hmac; 5438 #endif 5439 array[DEVCONF_ENHANCED_DAD] = cnf->enhanced_dad; 5440 array[DEVCONF_ADDR_GEN_MODE] = cnf->addr_gen_mode; 5441 array[DEVCONF_DISABLE_POLICY] = cnf->disable_policy; 5442 array[DEVCONF_NDISC_TCLASS] = cnf->ndisc_tclass; 5443 } 5444 5445 static inline size_t inet6_ifla6_size(void) 5446 { 5447 return nla_total_size(4) /* IFLA_INET6_FLAGS */ 5448 + nla_total_size(sizeof(struct ifla_cacheinfo)) 5449 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */ 5450 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */ 5451 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */ 5452 + nla_total_size(sizeof(struct in6_addr)) /* IFLA_INET6_TOKEN */ 5453 + nla_total_size(1) /* IFLA_INET6_ADDR_GEN_MODE */ 5454 + 0; 5455 } 5456 5457 static inline size_t inet6_if_nlmsg_size(void) 5458 { 5459 return NLMSG_ALIGN(sizeof(struct ifinfomsg)) 5460 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */ 5461 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */ 5462 + nla_total_size(4) /* IFLA_MTU */ 5463 + nla_total_size(4) /* IFLA_LINK */ 5464 + nla_total_size(1) /* IFLA_OPERSTATE */ 5465 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */ 5466 } 5467 5468 static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib, 5469 int bytes) 5470 { 5471 int i; 5472 int pad = bytes - sizeof(u64) * ICMP6_MIB_MAX; 5473 BUG_ON(pad < 0); 5474 5475 /* Use put_unaligned() because stats may not be aligned for u64. */ 5476 put_unaligned(ICMP6_MIB_MAX, &stats[0]); 5477 for (i = 1; i < ICMP6_MIB_MAX; i++) 5478 put_unaligned(atomic_long_read(&mib[i]), &stats[i]); 5479 5480 memset(&stats[ICMP6_MIB_MAX], 0, pad); 5481 } 5482 5483 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu *mib, 5484 int bytes, size_t syncpoff) 5485 { 5486 int i, c; 5487 u64 buff[IPSTATS_MIB_MAX]; 5488 int pad = bytes - sizeof(u64) * IPSTATS_MIB_MAX; 5489 5490 BUG_ON(pad < 0); 5491 5492 memset(buff, 0, sizeof(buff)); 5493 buff[0] = IPSTATS_MIB_MAX; 5494 5495 for_each_possible_cpu(c) { 5496 for (i = 1; i < IPSTATS_MIB_MAX; i++) 5497 buff[i] += snmp_get_cpu_field64(mib, c, i, syncpoff); 5498 } 5499 5500 memcpy(stats, buff, IPSTATS_MIB_MAX * sizeof(u64)); 5501 memset(&stats[IPSTATS_MIB_MAX], 0, pad); 5502 } 5503 5504 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype, 5505 int bytes) 5506 { 5507 switch (attrtype) { 5508 case IFLA_INET6_STATS: 5509 __snmp6_fill_stats64(stats, idev->stats.ipv6, bytes, 5510 offsetof(struct ipstats_mib, syncp)); 5511 break; 5512 case IFLA_INET6_ICMP6STATS: 5513 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, bytes); 5514 break; 5515 } 5516 } 5517 5518 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev, 5519 u32 ext_filter_mask) 5520 { 5521 struct nlattr *nla; 5522 struct ifla_cacheinfo ci; 5523 5524 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags)) 5525 goto nla_put_failure; 5526 ci.max_reasm_len = IPV6_MAXPLEN; 5527 ci.tstamp = cstamp_delta(idev->tstamp); 5528 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time); 5529 ci.retrans_time = jiffies_to_msecs(NEIGH_VAR(idev->nd_parms, RETRANS_TIME)); 5530 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci)) 5531 goto nla_put_failure; 5532 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32)); 5533 if (!nla) 5534 goto nla_put_failure; 5535 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla)); 5536 5537 /* XXX - MC not implemented */ 5538 5539 if (ext_filter_mask & RTEXT_FILTER_SKIP_STATS) 5540 return 0; 5541 5542 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64)); 5543 if (!nla) 5544 goto nla_put_failure; 5545 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla)); 5546 5547 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64)); 5548 if (!nla) 5549 goto nla_put_failure; 5550 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla)); 5551 5552 nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr)); 5553 if (!nla) 5554 goto nla_put_failure; 5555 5556 if (nla_put_u8(skb, IFLA_INET6_ADDR_GEN_MODE, idev->cnf.addr_gen_mode)) 5557 goto nla_put_failure; 5558 5559 read_lock_bh(&idev->lock); 5560 memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla)); 5561 read_unlock_bh(&idev->lock); 5562 5563 return 0; 5564 5565 nla_put_failure: 5566 return -EMSGSIZE; 5567 } 5568 5569 static size_t inet6_get_link_af_size(const struct net_device *dev, 5570 u32 ext_filter_mask) 5571 { 5572 if (!__in6_dev_get(dev)) 5573 return 0; 5574 5575 return inet6_ifla6_size(); 5576 } 5577 5578 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev, 5579 u32 ext_filter_mask) 5580 { 5581 struct inet6_dev *idev = __in6_dev_get(dev); 5582 5583 if (!idev) 5584 return -ENODATA; 5585 5586 if (inet6_fill_ifla6_attrs(skb, idev, ext_filter_mask) < 0) 5587 return -EMSGSIZE; 5588 5589 return 0; 5590 } 5591 5592 static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token) 5593 { 5594 struct inet6_ifaddr *ifp; 5595 struct net_device *dev = idev->dev; 5596 bool clear_token, update_rs = false; 5597 struct in6_addr ll_addr; 5598 5599 ASSERT_RTNL(); 5600 5601 if (!token) 5602 return -EINVAL; 5603 if (dev->flags & (IFF_LOOPBACK | IFF_NOARP)) 5604 return -EINVAL; 5605 if (!ipv6_accept_ra(idev)) 5606 return -EINVAL; 5607 if (idev->cnf.rtr_solicits == 0) 5608 return -EINVAL; 5609 5610 write_lock_bh(&idev->lock); 5611 5612 BUILD_BUG_ON(sizeof(token->s6_addr) != 16); 5613 memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8); 5614 5615 write_unlock_bh(&idev->lock); 5616 5617 clear_token = ipv6_addr_any(token); 5618 if (clear_token) 5619 goto update_lft; 5620 5621 if (!idev->dead && (idev->if_flags & IF_READY) && 5622 !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE | 5623 IFA_F_OPTIMISTIC)) { 5624 /* If we're not ready, then normal ifup will take care 5625 * of this. Otherwise, we need to request our rs here. 5626 */ 5627 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters); 5628 update_rs = true; 5629 } 5630 5631 update_lft: 5632 write_lock_bh(&idev->lock); 5633 5634 if (update_rs) { 5635 idev->if_flags |= IF_RS_SENT; 5636 idev->rs_interval = rfc3315_s14_backoff_init( 5637 idev->cnf.rtr_solicit_interval); 5638 idev->rs_probes = 1; 5639 addrconf_mod_rs_timer(idev, idev->rs_interval); 5640 } 5641 5642 /* Well, that's kinda nasty ... */ 5643 list_for_each_entry(ifp, &idev->addr_list, if_list) { 5644 spin_lock(&ifp->lock); 5645 if (ifp->tokenized) { 5646 ifp->valid_lft = 0; 5647 ifp->prefered_lft = 0; 5648 } 5649 spin_unlock(&ifp->lock); 5650 } 5651 5652 write_unlock_bh(&idev->lock); 5653 inet6_ifinfo_notify(RTM_NEWLINK, idev); 5654 addrconf_verify_rtnl(); 5655 return 0; 5656 } 5657 5658 static const struct nla_policy inet6_af_policy[IFLA_INET6_MAX + 1] = { 5659 [IFLA_INET6_ADDR_GEN_MODE] = { .type = NLA_U8 }, 5660 [IFLA_INET6_TOKEN] = { .len = sizeof(struct in6_addr) }, 5661 }; 5662 5663 static int check_addr_gen_mode(int mode) 5664 { 5665 if (mode != IN6_ADDR_GEN_MODE_EUI64 && 5666 mode != IN6_ADDR_GEN_MODE_NONE && 5667 mode != IN6_ADDR_GEN_MODE_STABLE_PRIVACY && 5668 mode != IN6_ADDR_GEN_MODE_RANDOM) 5669 return -EINVAL; 5670 return 1; 5671 } 5672 5673 static int check_stable_privacy(struct inet6_dev *idev, struct net *net, 5674 int mode) 5675 { 5676 if (mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY && 5677 !idev->cnf.stable_secret.initialized && 5678 !net->ipv6.devconf_dflt->stable_secret.initialized) 5679 return -EINVAL; 5680 return 1; 5681 } 5682 5683 static int inet6_validate_link_af(const struct net_device *dev, 5684 const struct nlattr *nla) 5685 { 5686 struct nlattr *tb[IFLA_INET6_MAX + 1]; 5687 struct inet6_dev *idev = NULL; 5688 int err; 5689 5690 if (dev) { 5691 idev = __in6_dev_get(dev); 5692 if (!idev) 5693 return -EAFNOSUPPORT; 5694 } 5695 5696 err = nla_parse_nested_deprecated(tb, IFLA_INET6_MAX, nla, 5697 inet6_af_policy, NULL); 5698 if (err) 5699 return err; 5700 5701 if (!tb[IFLA_INET6_TOKEN] && !tb[IFLA_INET6_ADDR_GEN_MODE]) 5702 return -EINVAL; 5703 5704 if (tb[IFLA_INET6_ADDR_GEN_MODE]) { 5705 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]); 5706 5707 if (check_addr_gen_mode(mode) < 0) 5708 return -EINVAL; 5709 if (dev && check_stable_privacy(idev, dev_net(dev), mode) < 0) 5710 return -EINVAL; 5711 } 5712 5713 return 0; 5714 } 5715 5716 static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla) 5717 { 5718 struct inet6_dev *idev = __in6_dev_get(dev); 5719 struct nlattr *tb[IFLA_INET6_MAX + 1]; 5720 int err; 5721 5722 if (nla_parse_nested_deprecated(tb, IFLA_INET6_MAX, nla, NULL, NULL) < 0) 5723 BUG(); 5724 5725 if (tb[IFLA_INET6_TOKEN]) { 5726 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN])); 5727 if (err) 5728 return err; 5729 } 5730 5731 if (tb[IFLA_INET6_ADDR_GEN_MODE]) { 5732 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]); 5733 5734 idev->cnf.addr_gen_mode = mode; 5735 } 5736 5737 return 0; 5738 } 5739 5740 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev, 5741 u32 portid, u32 seq, int event, unsigned int flags) 5742 { 5743 struct net_device *dev = idev->dev; 5744 struct ifinfomsg *hdr; 5745 struct nlmsghdr *nlh; 5746 void *protoinfo; 5747 5748 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags); 5749 if (!nlh) 5750 return -EMSGSIZE; 5751 5752 hdr = nlmsg_data(nlh); 5753 hdr->ifi_family = AF_INET6; 5754 hdr->__ifi_pad = 0; 5755 hdr->ifi_type = dev->type; 5756 hdr->ifi_index = dev->ifindex; 5757 hdr->ifi_flags = dev_get_flags(dev); 5758 hdr->ifi_change = 0; 5759 5760 if (nla_put_string(skb, IFLA_IFNAME, dev->name) || 5761 (dev->addr_len && 5762 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) || 5763 nla_put_u32(skb, IFLA_MTU, dev->mtu) || 5764 (dev->ifindex != dev_get_iflink(dev) && 5765 nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))) || 5766 nla_put_u8(skb, IFLA_OPERSTATE, 5767 netif_running(dev) ? dev->operstate : IF_OPER_DOWN)) 5768 goto nla_put_failure; 5769 protoinfo = nla_nest_start_noflag(skb, IFLA_PROTINFO); 5770 if (!protoinfo) 5771 goto nla_put_failure; 5772 5773 if (inet6_fill_ifla6_attrs(skb, idev, 0) < 0) 5774 goto nla_put_failure; 5775 5776 nla_nest_end(skb, protoinfo); 5777 nlmsg_end(skb, nlh); 5778 return 0; 5779 5780 nla_put_failure: 5781 nlmsg_cancel(skb, nlh); 5782 return -EMSGSIZE; 5783 } 5784 5785 static int inet6_valid_dump_ifinfo(const struct nlmsghdr *nlh, 5786 struct netlink_ext_ack *extack) 5787 { 5788 struct ifinfomsg *ifm; 5789 5790 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) { 5791 NL_SET_ERR_MSG_MOD(extack, "Invalid header for link dump request"); 5792 return -EINVAL; 5793 } 5794 5795 if (nlmsg_attrlen(nlh, sizeof(*ifm))) { 5796 NL_SET_ERR_MSG_MOD(extack, "Invalid data after header"); 5797 return -EINVAL; 5798 } 5799 5800 ifm = nlmsg_data(nlh); 5801 if (ifm->__ifi_pad || ifm->ifi_type || ifm->ifi_flags || 5802 ifm->ifi_change || ifm->ifi_index) { 5803 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for dump request"); 5804 return -EINVAL; 5805 } 5806 5807 return 0; 5808 } 5809 5810 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb) 5811 { 5812 struct net *net = sock_net(skb->sk); 5813 int h, s_h; 5814 int idx = 0, s_idx; 5815 struct net_device *dev; 5816 struct inet6_dev *idev; 5817 struct hlist_head *head; 5818 5819 /* only requests using strict checking can pass data to 5820 * influence the dump 5821 */ 5822 if (cb->strict_check) { 5823 int err = inet6_valid_dump_ifinfo(cb->nlh, cb->extack); 5824 5825 if (err < 0) 5826 return err; 5827 } 5828 5829 s_h = cb->args[0]; 5830 s_idx = cb->args[1]; 5831 5832 rcu_read_lock(); 5833 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 5834 idx = 0; 5835 head = &net->dev_index_head[h]; 5836 hlist_for_each_entry_rcu(dev, head, index_hlist) { 5837 if (idx < s_idx) 5838 goto cont; 5839 idev = __in6_dev_get(dev); 5840 if (!idev) 5841 goto cont; 5842 if (inet6_fill_ifinfo(skb, idev, 5843 NETLINK_CB(cb->skb).portid, 5844 cb->nlh->nlmsg_seq, 5845 RTM_NEWLINK, NLM_F_MULTI) < 0) 5846 goto out; 5847 cont: 5848 idx++; 5849 } 5850 } 5851 out: 5852 rcu_read_unlock(); 5853 cb->args[1] = idx; 5854 cb->args[0] = h; 5855 5856 return skb->len; 5857 } 5858 5859 void inet6_ifinfo_notify(int event, struct inet6_dev *idev) 5860 { 5861 struct sk_buff *skb; 5862 struct net *net = dev_net(idev->dev); 5863 int err = -ENOBUFS; 5864 5865 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC); 5866 if (!skb) 5867 goto errout; 5868 5869 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0); 5870 if (err < 0) { 5871 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */ 5872 WARN_ON(err == -EMSGSIZE); 5873 kfree_skb(skb); 5874 goto errout; 5875 } 5876 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC); 5877 return; 5878 errout: 5879 if (err < 0) 5880 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err); 5881 } 5882 5883 static inline size_t inet6_prefix_nlmsg_size(void) 5884 { 5885 return NLMSG_ALIGN(sizeof(struct prefixmsg)) 5886 + nla_total_size(sizeof(struct in6_addr)) 5887 + nla_total_size(sizeof(struct prefix_cacheinfo)); 5888 } 5889 5890 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev, 5891 struct prefix_info *pinfo, u32 portid, u32 seq, 5892 int event, unsigned int flags) 5893 { 5894 struct prefixmsg *pmsg; 5895 struct nlmsghdr *nlh; 5896 struct prefix_cacheinfo ci; 5897 5898 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags); 5899 if (!nlh) 5900 return -EMSGSIZE; 5901 5902 pmsg = nlmsg_data(nlh); 5903 pmsg->prefix_family = AF_INET6; 5904 pmsg->prefix_pad1 = 0; 5905 pmsg->prefix_pad2 = 0; 5906 pmsg->prefix_ifindex = idev->dev->ifindex; 5907 pmsg->prefix_len = pinfo->prefix_len; 5908 pmsg->prefix_type = pinfo->type; 5909 pmsg->prefix_pad3 = 0; 5910 pmsg->prefix_flags = 0; 5911 if (pinfo->onlink) 5912 pmsg->prefix_flags |= IF_PREFIX_ONLINK; 5913 if (pinfo->autoconf) 5914 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF; 5915 5916 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix)) 5917 goto nla_put_failure; 5918 ci.preferred_time = ntohl(pinfo->prefered); 5919 ci.valid_time = ntohl(pinfo->valid); 5920 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci)) 5921 goto nla_put_failure; 5922 nlmsg_end(skb, nlh); 5923 return 0; 5924 5925 nla_put_failure: 5926 nlmsg_cancel(skb, nlh); 5927 return -EMSGSIZE; 5928 } 5929 5930 static void inet6_prefix_notify(int event, struct inet6_dev *idev, 5931 struct prefix_info *pinfo) 5932 { 5933 struct sk_buff *skb; 5934 struct net *net = dev_net(idev->dev); 5935 int err = -ENOBUFS; 5936 5937 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC); 5938 if (!skb) 5939 goto errout; 5940 5941 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0); 5942 if (err < 0) { 5943 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */ 5944 WARN_ON(err == -EMSGSIZE); 5945 kfree_skb(skb); 5946 goto errout; 5947 } 5948 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC); 5949 return; 5950 errout: 5951 if (err < 0) 5952 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err); 5953 } 5954 5955 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 5956 { 5957 struct net *net = dev_net(ifp->idev->dev); 5958 5959 if (event) 5960 ASSERT_RTNL(); 5961 5962 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp); 5963 5964 switch (event) { 5965 case RTM_NEWADDR: 5966 /* 5967 * If the address was optimistic 5968 * we inserted the route at the start of 5969 * our DAD process, so we don't need 5970 * to do it again 5971 */ 5972 if (!rcu_access_pointer(ifp->rt->fib6_node)) 5973 ip6_ins_rt(net, ifp->rt); 5974 if (ifp->idev->cnf.forwarding) 5975 addrconf_join_anycast(ifp); 5976 if (!ipv6_addr_any(&ifp->peer_addr)) 5977 addrconf_prefix_route(&ifp->peer_addr, 128, 0, 5978 ifp->idev->dev, 0, 0, 5979 GFP_ATOMIC); 5980 break; 5981 case RTM_DELADDR: 5982 if (ifp->idev->cnf.forwarding) 5983 addrconf_leave_anycast(ifp); 5984 addrconf_leave_solict(ifp->idev, &ifp->addr); 5985 if (!ipv6_addr_any(&ifp->peer_addr)) { 5986 struct fib6_info *rt; 5987 5988 rt = addrconf_get_prefix_route(&ifp->peer_addr, 128, 5989 ifp->idev->dev, 0, 0, 5990 false); 5991 if (rt) 5992 ip6_del_rt(net, rt); 5993 } 5994 if (ifp->rt) { 5995 ip6_del_rt(net, ifp->rt); 5996 ifp->rt = NULL; 5997 } 5998 rt_genid_bump_ipv6(net); 5999 break; 6000 } 6001 atomic_inc(&net->ipv6.dev_addr_genid); 6002 } 6003 6004 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 6005 { 6006 rcu_read_lock_bh(); 6007 if (likely(ifp->idev->dead == 0)) 6008 __ipv6_ifa_notify(event, ifp); 6009 rcu_read_unlock_bh(); 6010 } 6011 6012 #ifdef CONFIG_SYSCTL 6013 6014 static 6015 int addrconf_sysctl_forward(struct ctl_table *ctl, int write, 6016 void __user *buffer, size_t *lenp, loff_t *ppos) 6017 { 6018 int *valp = ctl->data; 6019 int val = *valp; 6020 loff_t pos = *ppos; 6021 struct ctl_table lctl; 6022 int ret; 6023 6024 /* 6025 * ctl->data points to idev->cnf.forwarding, we should 6026 * not modify it until we get the rtnl lock. 6027 */ 6028 lctl = *ctl; 6029 lctl.data = &val; 6030 6031 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 6032 6033 if (write) 6034 ret = addrconf_fixup_forwarding(ctl, valp, val); 6035 if (ret) 6036 *ppos = pos; 6037 return ret; 6038 } 6039 6040 static 6041 int addrconf_sysctl_mtu(struct ctl_table *ctl, int write, 6042 void __user *buffer, size_t *lenp, loff_t *ppos) 6043 { 6044 struct inet6_dev *idev = ctl->extra1; 6045 int min_mtu = IPV6_MIN_MTU; 6046 struct ctl_table lctl; 6047 6048 lctl = *ctl; 6049 lctl.extra1 = &min_mtu; 6050 lctl.extra2 = idev ? &idev->dev->mtu : NULL; 6051 6052 return proc_dointvec_minmax(&lctl, write, buffer, lenp, ppos); 6053 } 6054 6055 static void dev_disable_change(struct inet6_dev *idev) 6056 { 6057 struct netdev_notifier_info info; 6058 6059 if (!idev || !idev->dev) 6060 return; 6061 6062 netdev_notifier_info_init(&info, idev->dev); 6063 if (idev->cnf.disable_ipv6) 6064 addrconf_notify(NULL, NETDEV_DOWN, &info); 6065 else 6066 addrconf_notify(NULL, NETDEV_UP, &info); 6067 } 6068 6069 static void addrconf_disable_change(struct net *net, __s32 newf) 6070 { 6071 struct net_device *dev; 6072 struct inet6_dev *idev; 6073 6074 for_each_netdev(net, dev) { 6075 idev = __in6_dev_get(dev); 6076 if (idev) { 6077 int changed = (!idev->cnf.disable_ipv6) ^ (!newf); 6078 idev->cnf.disable_ipv6 = newf; 6079 if (changed) 6080 dev_disable_change(idev); 6081 } 6082 } 6083 } 6084 6085 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf) 6086 { 6087 struct net *net; 6088 int old; 6089 6090 if (!rtnl_trylock()) 6091 return restart_syscall(); 6092 6093 net = (struct net *)table->extra2; 6094 old = *p; 6095 *p = newf; 6096 6097 if (p == &net->ipv6.devconf_dflt->disable_ipv6) { 6098 rtnl_unlock(); 6099 return 0; 6100 } 6101 6102 if (p == &net->ipv6.devconf_all->disable_ipv6) { 6103 net->ipv6.devconf_dflt->disable_ipv6 = newf; 6104 addrconf_disable_change(net, newf); 6105 } else if ((!newf) ^ (!old)) 6106 dev_disable_change((struct inet6_dev *)table->extra1); 6107 6108 rtnl_unlock(); 6109 return 0; 6110 } 6111 6112 static 6113 int addrconf_sysctl_disable(struct ctl_table *ctl, int write, 6114 void __user *buffer, size_t *lenp, loff_t *ppos) 6115 { 6116 int *valp = ctl->data; 6117 int val = *valp; 6118 loff_t pos = *ppos; 6119 struct ctl_table lctl; 6120 int ret; 6121 6122 /* 6123 * ctl->data points to idev->cnf.disable_ipv6, we should 6124 * not modify it until we get the rtnl lock. 6125 */ 6126 lctl = *ctl; 6127 lctl.data = &val; 6128 6129 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 6130 6131 if (write) 6132 ret = addrconf_disable_ipv6(ctl, valp, val); 6133 if (ret) 6134 *ppos = pos; 6135 return ret; 6136 } 6137 6138 static 6139 int addrconf_sysctl_proxy_ndp(struct ctl_table *ctl, int write, 6140 void __user *buffer, size_t *lenp, loff_t *ppos) 6141 { 6142 int *valp = ctl->data; 6143 int ret; 6144 int old, new; 6145 6146 old = *valp; 6147 ret = proc_dointvec(ctl, write, buffer, lenp, ppos); 6148 new = *valp; 6149 6150 if (write && old != new) { 6151 struct net *net = ctl->extra2; 6152 6153 if (!rtnl_trylock()) 6154 return restart_syscall(); 6155 6156 if (valp == &net->ipv6.devconf_dflt->proxy_ndp) 6157 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 6158 NETCONFA_PROXY_NEIGH, 6159 NETCONFA_IFINDEX_DEFAULT, 6160 net->ipv6.devconf_dflt); 6161 else if (valp == &net->ipv6.devconf_all->proxy_ndp) 6162 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 6163 NETCONFA_PROXY_NEIGH, 6164 NETCONFA_IFINDEX_ALL, 6165 net->ipv6.devconf_all); 6166 else { 6167 struct inet6_dev *idev = ctl->extra1; 6168 6169 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 6170 NETCONFA_PROXY_NEIGH, 6171 idev->dev->ifindex, 6172 &idev->cnf); 6173 } 6174 rtnl_unlock(); 6175 } 6176 6177 return ret; 6178 } 6179 6180 static int addrconf_sysctl_addr_gen_mode(struct ctl_table *ctl, int write, 6181 void __user *buffer, size_t *lenp, 6182 loff_t *ppos) 6183 { 6184 int ret = 0; 6185 u32 new_val; 6186 struct inet6_dev *idev = (struct inet6_dev *)ctl->extra1; 6187 struct net *net = (struct net *)ctl->extra2; 6188 struct ctl_table tmp = { 6189 .data = &new_val, 6190 .maxlen = sizeof(new_val), 6191 .mode = ctl->mode, 6192 }; 6193 6194 if (!rtnl_trylock()) 6195 return restart_syscall(); 6196 6197 new_val = *((u32 *)ctl->data); 6198 6199 ret = proc_douintvec(&tmp, write, buffer, lenp, ppos); 6200 if (ret != 0) 6201 goto out; 6202 6203 if (write) { 6204 if (check_addr_gen_mode(new_val) < 0) { 6205 ret = -EINVAL; 6206 goto out; 6207 } 6208 6209 if (idev) { 6210 if (check_stable_privacy(idev, net, new_val) < 0) { 6211 ret = -EINVAL; 6212 goto out; 6213 } 6214 6215 if (idev->cnf.addr_gen_mode != new_val) { 6216 idev->cnf.addr_gen_mode = new_val; 6217 addrconf_dev_config(idev->dev); 6218 } 6219 } else if (&net->ipv6.devconf_all->addr_gen_mode == ctl->data) { 6220 struct net_device *dev; 6221 6222 net->ipv6.devconf_dflt->addr_gen_mode = new_val; 6223 for_each_netdev(net, dev) { 6224 idev = __in6_dev_get(dev); 6225 if (idev && 6226 idev->cnf.addr_gen_mode != new_val) { 6227 idev->cnf.addr_gen_mode = new_val; 6228 addrconf_dev_config(idev->dev); 6229 } 6230 } 6231 } 6232 6233 *((u32 *)ctl->data) = new_val; 6234 } 6235 6236 out: 6237 rtnl_unlock(); 6238 6239 return ret; 6240 } 6241 6242 static int addrconf_sysctl_stable_secret(struct ctl_table *ctl, int write, 6243 void __user *buffer, size_t *lenp, 6244 loff_t *ppos) 6245 { 6246 int err; 6247 struct in6_addr addr; 6248 char str[IPV6_MAX_STRLEN]; 6249 struct ctl_table lctl = *ctl; 6250 struct net *net = ctl->extra2; 6251 struct ipv6_stable_secret *secret = ctl->data; 6252 6253 if (&net->ipv6.devconf_all->stable_secret == ctl->data) 6254 return -EIO; 6255 6256 lctl.maxlen = IPV6_MAX_STRLEN; 6257 lctl.data = str; 6258 6259 if (!rtnl_trylock()) 6260 return restart_syscall(); 6261 6262 if (!write && !secret->initialized) { 6263 err = -EIO; 6264 goto out; 6265 } 6266 6267 err = snprintf(str, sizeof(str), "%pI6", &secret->secret); 6268 if (err >= sizeof(str)) { 6269 err = -EIO; 6270 goto out; 6271 } 6272 6273 err = proc_dostring(&lctl, write, buffer, lenp, ppos); 6274 if (err || !write) 6275 goto out; 6276 6277 if (in6_pton(str, -1, addr.in6_u.u6_addr8, -1, NULL) != 1) { 6278 err = -EIO; 6279 goto out; 6280 } 6281 6282 secret->initialized = true; 6283 secret->secret = addr; 6284 6285 if (&net->ipv6.devconf_dflt->stable_secret == ctl->data) { 6286 struct net_device *dev; 6287 6288 for_each_netdev(net, dev) { 6289 struct inet6_dev *idev = __in6_dev_get(dev); 6290 6291 if (idev) { 6292 idev->cnf.addr_gen_mode = 6293 IN6_ADDR_GEN_MODE_STABLE_PRIVACY; 6294 } 6295 } 6296 } else { 6297 struct inet6_dev *idev = ctl->extra1; 6298 6299 idev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY; 6300 } 6301 6302 out: 6303 rtnl_unlock(); 6304 6305 return err; 6306 } 6307 6308 static 6309 int addrconf_sysctl_ignore_routes_with_linkdown(struct ctl_table *ctl, 6310 int write, 6311 void __user *buffer, 6312 size_t *lenp, 6313 loff_t *ppos) 6314 { 6315 int *valp = ctl->data; 6316 int val = *valp; 6317 loff_t pos = *ppos; 6318 struct ctl_table lctl; 6319 int ret; 6320 6321 /* ctl->data points to idev->cnf.ignore_routes_when_linkdown 6322 * we should not modify it until we get the rtnl lock. 6323 */ 6324 lctl = *ctl; 6325 lctl.data = &val; 6326 6327 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 6328 6329 if (write) 6330 ret = addrconf_fixup_linkdown(ctl, valp, val); 6331 if (ret) 6332 *ppos = pos; 6333 return ret; 6334 } 6335 6336 static 6337 void addrconf_set_nopolicy(struct rt6_info *rt, int action) 6338 { 6339 if (rt) { 6340 if (action) 6341 rt->dst.flags |= DST_NOPOLICY; 6342 else 6343 rt->dst.flags &= ~DST_NOPOLICY; 6344 } 6345 } 6346 6347 static 6348 void addrconf_disable_policy_idev(struct inet6_dev *idev, int val) 6349 { 6350 struct inet6_ifaddr *ifa; 6351 6352 read_lock_bh(&idev->lock); 6353 list_for_each_entry(ifa, &idev->addr_list, if_list) { 6354 spin_lock(&ifa->lock); 6355 if (ifa->rt) { 6356 /* host routes only use builtin fib6_nh */ 6357 struct fib6_nh *nh = ifa->rt->fib6_nh; 6358 int cpu; 6359 6360 rcu_read_lock(); 6361 ifa->rt->dst_nopolicy = val ? true : false; 6362 if (nh->rt6i_pcpu) { 6363 for_each_possible_cpu(cpu) { 6364 struct rt6_info **rtp; 6365 6366 rtp = per_cpu_ptr(nh->rt6i_pcpu, cpu); 6367 addrconf_set_nopolicy(*rtp, val); 6368 } 6369 } 6370 rcu_read_unlock(); 6371 } 6372 spin_unlock(&ifa->lock); 6373 } 6374 read_unlock_bh(&idev->lock); 6375 } 6376 6377 static 6378 int addrconf_disable_policy(struct ctl_table *ctl, int *valp, int val) 6379 { 6380 struct inet6_dev *idev; 6381 struct net *net; 6382 6383 if (!rtnl_trylock()) 6384 return restart_syscall(); 6385 6386 *valp = val; 6387 6388 net = (struct net *)ctl->extra2; 6389 if (valp == &net->ipv6.devconf_dflt->disable_policy) { 6390 rtnl_unlock(); 6391 return 0; 6392 } 6393 6394 if (valp == &net->ipv6.devconf_all->disable_policy) { 6395 struct net_device *dev; 6396 6397 for_each_netdev(net, dev) { 6398 idev = __in6_dev_get(dev); 6399 if (idev) 6400 addrconf_disable_policy_idev(idev, val); 6401 } 6402 } else { 6403 idev = (struct inet6_dev *)ctl->extra1; 6404 addrconf_disable_policy_idev(idev, val); 6405 } 6406 6407 rtnl_unlock(); 6408 return 0; 6409 } 6410 6411 static 6412 int addrconf_sysctl_disable_policy(struct ctl_table *ctl, int write, 6413 void __user *buffer, size_t *lenp, 6414 loff_t *ppos) 6415 { 6416 int *valp = ctl->data; 6417 int val = *valp; 6418 loff_t pos = *ppos; 6419 struct ctl_table lctl; 6420 int ret; 6421 6422 lctl = *ctl; 6423 lctl.data = &val; 6424 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 6425 6426 if (write && (*valp != val)) 6427 ret = addrconf_disable_policy(ctl, valp, val); 6428 6429 if (ret) 6430 *ppos = pos; 6431 6432 return ret; 6433 } 6434 6435 static int minus_one = -1; 6436 static const int two_five_five = 255; 6437 6438 static const struct ctl_table addrconf_sysctl[] = { 6439 { 6440 .procname = "forwarding", 6441 .data = &ipv6_devconf.forwarding, 6442 .maxlen = sizeof(int), 6443 .mode = 0644, 6444 .proc_handler = addrconf_sysctl_forward, 6445 }, 6446 { 6447 .procname = "hop_limit", 6448 .data = &ipv6_devconf.hop_limit, 6449 .maxlen = sizeof(int), 6450 .mode = 0644, 6451 .proc_handler = proc_dointvec_minmax, 6452 .extra1 = (void *)SYSCTL_ONE, 6453 .extra2 = (void *)&two_five_five, 6454 }, 6455 { 6456 .procname = "mtu", 6457 .data = &ipv6_devconf.mtu6, 6458 .maxlen = sizeof(int), 6459 .mode = 0644, 6460 .proc_handler = addrconf_sysctl_mtu, 6461 }, 6462 { 6463 .procname = "accept_ra", 6464 .data = &ipv6_devconf.accept_ra, 6465 .maxlen = sizeof(int), 6466 .mode = 0644, 6467 .proc_handler = proc_dointvec, 6468 }, 6469 { 6470 .procname = "accept_redirects", 6471 .data = &ipv6_devconf.accept_redirects, 6472 .maxlen = sizeof(int), 6473 .mode = 0644, 6474 .proc_handler = proc_dointvec, 6475 }, 6476 { 6477 .procname = "autoconf", 6478 .data = &ipv6_devconf.autoconf, 6479 .maxlen = sizeof(int), 6480 .mode = 0644, 6481 .proc_handler = proc_dointvec, 6482 }, 6483 { 6484 .procname = "dad_transmits", 6485 .data = &ipv6_devconf.dad_transmits, 6486 .maxlen = sizeof(int), 6487 .mode = 0644, 6488 .proc_handler = proc_dointvec, 6489 }, 6490 { 6491 .procname = "router_solicitations", 6492 .data = &ipv6_devconf.rtr_solicits, 6493 .maxlen = sizeof(int), 6494 .mode = 0644, 6495 .proc_handler = proc_dointvec_minmax, 6496 .extra1 = &minus_one, 6497 }, 6498 { 6499 .procname = "router_solicitation_interval", 6500 .data = &ipv6_devconf.rtr_solicit_interval, 6501 .maxlen = sizeof(int), 6502 .mode = 0644, 6503 .proc_handler = proc_dointvec_jiffies, 6504 }, 6505 { 6506 .procname = "router_solicitation_max_interval", 6507 .data = &ipv6_devconf.rtr_solicit_max_interval, 6508 .maxlen = sizeof(int), 6509 .mode = 0644, 6510 .proc_handler = proc_dointvec_jiffies, 6511 }, 6512 { 6513 .procname = "router_solicitation_delay", 6514 .data = &ipv6_devconf.rtr_solicit_delay, 6515 .maxlen = sizeof(int), 6516 .mode = 0644, 6517 .proc_handler = proc_dointvec_jiffies, 6518 }, 6519 { 6520 .procname = "force_mld_version", 6521 .data = &ipv6_devconf.force_mld_version, 6522 .maxlen = sizeof(int), 6523 .mode = 0644, 6524 .proc_handler = proc_dointvec, 6525 }, 6526 { 6527 .procname = "mldv1_unsolicited_report_interval", 6528 .data = 6529 &ipv6_devconf.mldv1_unsolicited_report_interval, 6530 .maxlen = sizeof(int), 6531 .mode = 0644, 6532 .proc_handler = proc_dointvec_ms_jiffies, 6533 }, 6534 { 6535 .procname = "mldv2_unsolicited_report_interval", 6536 .data = 6537 &ipv6_devconf.mldv2_unsolicited_report_interval, 6538 .maxlen = sizeof(int), 6539 .mode = 0644, 6540 .proc_handler = proc_dointvec_ms_jiffies, 6541 }, 6542 { 6543 .procname = "use_tempaddr", 6544 .data = &ipv6_devconf.use_tempaddr, 6545 .maxlen = sizeof(int), 6546 .mode = 0644, 6547 .proc_handler = proc_dointvec, 6548 }, 6549 { 6550 .procname = "temp_valid_lft", 6551 .data = &ipv6_devconf.temp_valid_lft, 6552 .maxlen = sizeof(int), 6553 .mode = 0644, 6554 .proc_handler = proc_dointvec, 6555 }, 6556 { 6557 .procname = "temp_prefered_lft", 6558 .data = &ipv6_devconf.temp_prefered_lft, 6559 .maxlen = sizeof(int), 6560 .mode = 0644, 6561 .proc_handler = proc_dointvec, 6562 }, 6563 { 6564 .procname = "regen_max_retry", 6565 .data = &ipv6_devconf.regen_max_retry, 6566 .maxlen = sizeof(int), 6567 .mode = 0644, 6568 .proc_handler = proc_dointvec, 6569 }, 6570 { 6571 .procname = "max_desync_factor", 6572 .data = &ipv6_devconf.max_desync_factor, 6573 .maxlen = sizeof(int), 6574 .mode = 0644, 6575 .proc_handler = proc_dointvec, 6576 }, 6577 { 6578 .procname = "max_addresses", 6579 .data = &ipv6_devconf.max_addresses, 6580 .maxlen = sizeof(int), 6581 .mode = 0644, 6582 .proc_handler = proc_dointvec, 6583 }, 6584 { 6585 .procname = "accept_ra_defrtr", 6586 .data = &ipv6_devconf.accept_ra_defrtr, 6587 .maxlen = sizeof(int), 6588 .mode = 0644, 6589 .proc_handler = proc_dointvec, 6590 }, 6591 { 6592 .procname = "accept_ra_min_hop_limit", 6593 .data = &ipv6_devconf.accept_ra_min_hop_limit, 6594 .maxlen = sizeof(int), 6595 .mode = 0644, 6596 .proc_handler = proc_dointvec, 6597 }, 6598 { 6599 .procname = "accept_ra_pinfo", 6600 .data = &ipv6_devconf.accept_ra_pinfo, 6601 .maxlen = sizeof(int), 6602 .mode = 0644, 6603 .proc_handler = proc_dointvec, 6604 }, 6605 #ifdef CONFIG_IPV6_ROUTER_PREF 6606 { 6607 .procname = "accept_ra_rtr_pref", 6608 .data = &ipv6_devconf.accept_ra_rtr_pref, 6609 .maxlen = sizeof(int), 6610 .mode = 0644, 6611 .proc_handler = proc_dointvec, 6612 }, 6613 { 6614 .procname = "router_probe_interval", 6615 .data = &ipv6_devconf.rtr_probe_interval, 6616 .maxlen = sizeof(int), 6617 .mode = 0644, 6618 .proc_handler = proc_dointvec_jiffies, 6619 }, 6620 #ifdef CONFIG_IPV6_ROUTE_INFO 6621 { 6622 .procname = "accept_ra_rt_info_min_plen", 6623 .data = &ipv6_devconf.accept_ra_rt_info_min_plen, 6624 .maxlen = sizeof(int), 6625 .mode = 0644, 6626 .proc_handler = proc_dointvec, 6627 }, 6628 { 6629 .procname = "accept_ra_rt_info_max_plen", 6630 .data = &ipv6_devconf.accept_ra_rt_info_max_plen, 6631 .maxlen = sizeof(int), 6632 .mode = 0644, 6633 .proc_handler = proc_dointvec, 6634 }, 6635 #endif 6636 #endif 6637 { 6638 .procname = "proxy_ndp", 6639 .data = &ipv6_devconf.proxy_ndp, 6640 .maxlen = sizeof(int), 6641 .mode = 0644, 6642 .proc_handler = addrconf_sysctl_proxy_ndp, 6643 }, 6644 { 6645 .procname = "accept_source_route", 6646 .data = &ipv6_devconf.accept_source_route, 6647 .maxlen = sizeof(int), 6648 .mode = 0644, 6649 .proc_handler = proc_dointvec, 6650 }, 6651 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 6652 { 6653 .procname = "optimistic_dad", 6654 .data = &ipv6_devconf.optimistic_dad, 6655 .maxlen = sizeof(int), 6656 .mode = 0644, 6657 .proc_handler = proc_dointvec, 6658 }, 6659 { 6660 .procname = "use_optimistic", 6661 .data = &ipv6_devconf.use_optimistic, 6662 .maxlen = sizeof(int), 6663 .mode = 0644, 6664 .proc_handler = proc_dointvec, 6665 }, 6666 #endif 6667 #ifdef CONFIG_IPV6_MROUTE 6668 { 6669 .procname = "mc_forwarding", 6670 .data = &ipv6_devconf.mc_forwarding, 6671 .maxlen = sizeof(int), 6672 .mode = 0444, 6673 .proc_handler = proc_dointvec, 6674 }, 6675 #endif 6676 { 6677 .procname = "disable_ipv6", 6678 .data = &ipv6_devconf.disable_ipv6, 6679 .maxlen = sizeof(int), 6680 .mode = 0644, 6681 .proc_handler = addrconf_sysctl_disable, 6682 }, 6683 { 6684 .procname = "accept_dad", 6685 .data = &ipv6_devconf.accept_dad, 6686 .maxlen = sizeof(int), 6687 .mode = 0644, 6688 .proc_handler = proc_dointvec, 6689 }, 6690 { 6691 .procname = "force_tllao", 6692 .data = &ipv6_devconf.force_tllao, 6693 .maxlen = sizeof(int), 6694 .mode = 0644, 6695 .proc_handler = proc_dointvec 6696 }, 6697 { 6698 .procname = "ndisc_notify", 6699 .data = &ipv6_devconf.ndisc_notify, 6700 .maxlen = sizeof(int), 6701 .mode = 0644, 6702 .proc_handler = proc_dointvec 6703 }, 6704 { 6705 .procname = "suppress_frag_ndisc", 6706 .data = &ipv6_devconf.suppress_frag_ndisc, 6707 .maxlen = sizeof(int), 6708 .mode = 0644, 6709 .proc_handler = proc_dointvec 6710 }, 6711 { 6712 .procname = "accept_ra_from_local", 6713 .data = &ipv6_devconf.accept_ra_from_local, 6714 .maxlen = sizeof(int), 6715 .mode = 0644, 6716 .proc_handler = proc_dointvec, 6717 }, 6718 { 6719 .procname = "accept_ra_mtu", 6720 .data = &ipv6_devconf.accept_ra_mtu, 6721 .maxlen = sizeof(int), 6722 .mode = 0644, 6723 .proc_handler = proc_dointvec, 6724 }, 6725 { 6726 .procname = "stable_secret", 6727 .data = &ipv6_devconf.stable_secret, 6728 .maxlen = IPV6_MAX_STRLEN, 6729 .mode = 0600, 6730 .proc_handler = addrconf_sysctl_stable_secret, 6731 }, 6732 { 6733 .procname = "use_oif_addrs_only", 6734 .data = &ipv6_devconf.use_oif_addrs_only, 6735 .maxlen = sizeof(int), 6736 .mode = 0644, 6737 .proc_handler = proc_dointvec, 6738 }, 6739 { 6740 .procname = "ignore_routes_with_linkdown", 6741 .data = &ipv6_devconf.ignore_routes_with_linkdown, 6742 .maxlen = sizeof(int), 6743 .mode = 0644, 6744 .proc_handler = addrconf_sysctl_ignore_routes_with_linkdown, 6745 }, 6746 { 6747 .procname = "drop_unicast_in_l2_multicast", 6748 .data = &ipv6_devconf.drop_unicast_in_l2_multicast, 6749 .maxlen = sizeof(int), 6750 .mode = 0644, 6751 .proc_handler = proc_dointvec, 6752 }, 6753 { 6754 .procname = "drop_unsolicited_na", 6755 .data = &ipv6_devconf.drop_unsolicited_na, 6756 .maxlen = sizeof(int), 6757 .mode = 0644, 6758 .proc_handler = proc_dointvec, 6759 }, 6760 { 6761 .procname = "keep_addr_on_down", 6762 .data = &ipv6_devconf.keep_addr_on_down, 6763 .maxlen = sizeof(int), 6764 .mode = 0644, 6765 .proc_handler = proc_dointvec, 6766 6767 }, 6768 { 6769 .procname = "seg6_enabled", 6770 .data = &ipv6_devconf.seg6_enabled, 6771 .maxlen = sizeof(int), 6772 .mode = 0644, 6773 .proc_handler = proc_dointvec, 6774 }, 6775 #ifdef CONFIG_IPV6_SEG6_HMAC 6776 { 6777 .procname = "seg6_require_hmac", 6778 .data = &ipv6_devconf.seg6_require_hmac, 6779 .maxlen = sizeof(int), 6780 .mode = 0644, 6781 .proc_handler = proc_dointvec, 6782 }, 6783 #endif 6784 { 6785 .procname = "enhanced_dad", 6786 .data = &ipv6_devconf.enhanced_dad, 6787 .maxlen = sizeof(int), 6788 .mode = 0644, 6789 .proc_handler = proc_dointvec, 6790 }, 6791 { 6792 .procname = "addr_gen_mode", 6793 .data = &ipv6_devconf.addr_gen_mode, 6794 .maxlen = sizeof(int), 6795 .mode = 0644, 6796 .proc_handler = addrconf_sysctl_addr_gen_mode, 6797 }, 6798 { 6799 .procname = "disable_policy", 6800 .data = &ipv6_devconf.disable_policy, 6801 .maxlen = sizeof(int), 6802 .mode = 0644, 6803 .proc_handler = addrconf_sysctl_disable_policy, 6804 }, 6805 { 6806 .procname = "ndisc_tclass", 6807 .data = &ipv6_devconf.ndisc_tclass, 6808 .maxlen = sizeof(int), 6809 .mode = 0644, 6810 .proc_handler = proc_dointvec_minmax, 6811 .extra1 = (void *)SYSCTL_ZERO, 6812 .extra2 = (void *)&two_five_five, 6813 }, 6814 { 6815 /* sentinel */ 6816 } 6817 }; 6818 6819 static int __addrconf_sysctl_register(struct net *net, char *dev_name, 6820 struct inet6_dev *idev, struct ipv6_devconf *p) 6821 { 6822 int i, ifindex; 6823 struct ctl_table *table; 6824 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ]; 6825 6826 table = kmemdup(addrconf_sysctl, sizeof(addrconf_sysctl), GFP_KERNEL); 6827 if (!table) 6828 goto out; 6829 6830 for (i = 0; table[i].data; i++) { 6831 table[i].data += (char *)p - (char *)&ipv6_devconf; 6832 /* If one of these is already set, then it is not safe to 6833 * overwrite either of them: this makes proc_dointvec_minmax 6834 * usable. 6835 */ 6836 if (!table[i].extra1 && !table[i].extra2) { 6837 table[i].extra1 = idev; /* embedded; no ref */ 6838 table[i].extra2 = net; 6839 } 6840 } 6841 6842 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name); 6843 6844 p->sysctl_header = register_net_sysctl(net, path, table); 6845 if (!p->sysctl_header) 6846 goto free; 6847 6848 if (!strcmp(dev_name, "all")) 6849 ifindex = NETCONFA_IFINDEX_ALL; 6850 else if (!strcmp(dev_name, "default")) 6851 ifindex = NETCONFA_IFINDEX_DEFAULT; 6852 else 6853 ifindex = idev->dev->ifindex; 6854 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, NETCONFA_ALL, 6855 ifindex, p); 6856 return 0; 6857 6858 free: 6859 kfree(table); 6860 out: 6861 return -ENOBUFS; 6862 } 6863 6864 static void __addrconf_sysctl_unregister(struct net *net, 6865 struct ipv6_devconf *p, int ifindex) 6866 { 6867 struct ctl_table *table; 6868 6869 if (!p->sysctl_header) 6870 return; 6871 6872 table = p->sysctl_header->ctl_table_arg; 6873 unregister_net_sysctl_table(p->sysctl_header); 6874 p->sysctl_header = NULL; 6875 kfree(table); 6876 6877 inet6_netconf_notify_devconf(net, RTM_DELNETCONF, 0, ifindex, NULL); 6878 } 6879 6880 static int addrconf_sysctl_register(struct inet6_dev *idev) 6881 { 6882 int err; 6883 6884 if (!sysctl_dev_name_is_allowed(idev->dev->name)) 6885 return -EINVAL; 6886 6887 err = neigh_sysctl_register(idev->dev, idev->nd_parms, 6888 &ndisc_ifinfo_sysctl_change); 6889 if (err) 6890 return err; 6891 err = __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name, 6892 idev, &idev->cnf); 6893 if (err) 6894 neigh_sysctl_unregister(idev->nd_parms); 6895 6896 return err; 6897 } 6898 6899 static void addrconf_sysctl_unregister(struct inet6_dev *idev) 6900 { 6901 __addrconf_sysctl_unregister(dev_net(idev->dev), &idev->cnf, 6902 idev->dev->ifindex); 6903 neigh_sysctl_unregister(idev->nd_parms); 6904 } 6905 6906 6907 #endif 6908 6909 static int __net_init addrconf_init_net(struct net *net) 6910 { 6911 int err = -ENOMEM; 6912 struct ipv6_devconf *all, *dflt; 6913 6914 all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL); 6915 if (!all) 6916 goto err_alloc_all; 6917 6918 dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL); 6919 if (!dflt) 6920 goto err_alloc_dflt; 6921 6922 if (IS_ENABLED(CONFIG_SYSCTL) && 6923 sysctl_devconf_inherit_init_net == 1 && !net_eq(net, &init_net)) { 6924 memcpy(all, init_net.ipv6.devconf_all, sizeof(ipv6_devconf)); 6925 memcpy(dflt, init_net.ipv6.devconf_dflt, sizeof(ipv6_devconf_dflt)); 6926 } 6927 6928 /* these will be inherited by all namespaces */ 6929 dflt->autoconf = ipv6_defaults.autoconf; 6930 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6; 6931 6932 dflt->stable_secret.initialized = false; 6933 all->stable_secret.initialized = false; 6934 6935 net->ipv6.devconf_all = all; 6936 net->ipv6.devconf_dflt = dflt; 6937 6938 #ifdef CONFIG_SYSCTL 6939 err = __addrconf_sysctl_register(net, "all", NULL, all); 6940 if (err < 0) 6941 goto err_reg_all; 6942 6943 err = __addrconf_sysctl_register(net, "default", NULL, dflt); 6944 if (err < 0) 6945 goto err_reg_dflt; 6946 #endif 6947 return 0; 6948 6949 #ifdef CONFIG_SYSCTL 6950 err_reg_dflt: 6951 __addrconf_sysctl_unregister(net, all, NETCONFA_IFINDEX_ALL); 6952 err_reg_all: 6953 kfree(dflt); 6954 #endif 6955 err_alloc_dflt: 6956 kfree(all); 6957 err_alloc_all: 6958 return err; 6959 } 6960 6961 static void __net_exit addrconf_exit_net(struct net *net) 6962 { 6963 #ifdef CONFIG_SYSCTL 6964 __addrconf_sysctl_unregister(net, net->ipv6.devconf_dflt, 6965 NETCONFA_IFINDEX_DEFAULT); 6966 __addrconf_sysctl_unregister(net, net->ipv6.devconf_all, 6967 NETCONFA_IFINDEX_ALL); 6968 #endif 6969 kfree(net->ipv6.devconf_dflt); 6970 kfree(net->ipv6.devconf_all); 6971 } 6972 6973 static struct pernet_operations addrconf_ops = { 6974 .init = addrconf_init_net, 6975 .exit = addrconf_exit_net, 6976 }; 6977 6978 static struct rtnl_af_ops inet6_ops __read_mostly = { 6979 .family = AF_INET6, 6980 .fill_link_af = inet6_fill_link_af, 6981 .get_link_af_size = inet6_get_link_af_size, 6982 .validate_link_af = inet6_validate_link_af, 6983 .set_link_af = inet6_set_link_af, 6984 }; 6985 6986 /* 6987 * Init / cleanup code 6988 */ 6989 6990 int __init addrconf_init(void) 6991 { 6992 struct inet6_dev *idev; 6993 int i, err; 6994 6995 err = ipv6_addr_label_init(); 6996 if (err < 0) { 6997 pr_crit("%s: cannot initialize default policy table: %d\n", 6998 __func__, err); 6999 goto out; 7000 } 7001 7002 err = register_pernet_subsys(&addrconf_ops); 7003 if (err < 0) 7004 goto out_addrlabel; 7005 7006 addrconf_wq = create_workqueue("ipv6_addrconf"); 7007 if (!addrconf_wq) { 7008 err = -ENOMEM; 7009 goto out_nowq; 7010 } 7011 7012 /* The addrconf netdev notifier requires that loopback_dev 7013 * has it's ipv6 private information allocated and setup 7014 * before it can bring up and give link-local addresses 7015 * to other devices which are up. 7016 * 7017 * Unfortunately, loopback_dev is not necessarily the first 7018 * entry in the global dev_base list of net devices. In fact, 7019 * it is likely to be the very last entry on that list. 7020 * So this causes the notifier registry below to try and 7021 * give link-local addresses to all devices besides loopback_dev 7022 * first, then loopback_dev, which cases all the non-loopback_dev 7023 * devices to fail to get a link-local address. 7024 * 7025 * So, as a temporary fix, allocate the ipv6 structure for 7026 * loopback_dev first by hand. 7027 * Longer term, all of the dependencies ipv6 has upon the loopback 7028 * device and it being up should be removed. 7029 */ 7030 rtnl_lock(); 7031 idev = ipv6_add_dev(init_net.loopback_dev); 7032 rtnl_unlock(); 7033 if (IS_ERR(idev)) { 7034 err = PTR_ERR(idev); 7035 goto errlo; 7036 } 7037 7038 ip6_route_init_special_entries(); 7039 7040 for (i = 0; i < IN6_ADDR_HSIZE; i++) 7041 INIT_HLIST_HEAD(&inet6_addr_lst[i]); 7042 7043 register_netdevice_notifier(&ipv6_dev_notf); 7044 7045 addrconf_verify(); 7046 7047 rtnl_af_register(&inet6_ops); 7048 7049 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETLINK, 7050 NULL, inet6_dump_ifinfo, 0); 7051 if (err < 0) 7052 goto errout; 7053 7054 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_NEWADDR, 7055 inet6_rtm_newaddr, NULL, 0); 7056 if (err < 0) 7057 goto errout; 7058 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_DELADDR, 7059 inet6_rtm_deladdr, NULL, 0); 7060 if (err < 0) 7061 goto errout; 7062 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETADDR, 7063 inet6_rtm_getaddr, inet6_dump_ifaddr, 7064 RTNL_FLAG_DOIT_UNLOCKED); 7065 if (err < 0) 7066 goto errout; 7067 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETMULTICAST, 7068 NULL, inet6_dump_ifmcaddr, 0); 7069 if (err < 0) 7070 goto errout; 7071 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETANYCAST, 7072 NULL, inet6_dump_ifacaddr, 0); 7073 if (err < 0) 7074 goto errout; 7075 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETNETCONF, 7076 inet6_netconf_get_devconf, 7077 inet6_netconf_dump_devconf, 7078 RTNL_FLAG_DOIT_UNLOCKED); 7079 if (err < 0) 7080 goto errout; 7081 err = ipv6_addr_label_rtnl_register(); 7082 if (err < 0) 7083 goto errout; 7084 7085 return 0; 7086 errout: 7087 rtnl_unregister_all(PF_INET6); 7088 rtnl_af_unregister(&inet6_ops); 7089 unregister_netdevice_notifier(&ipv6_dev_notf); 7090 errlo: 7091 destroy_workqueue(addrconf_wq); 7092 out_nowq: 7093 unregister_pernet_subsys(&addrconf_ops); 7094 out_addrlabel: 7095 ipv6_addr_label_cleanup(); 7096 out: 7097 return err; 7098 } 7099 7100 void addrconf_cleanup(void) 7101 { 7102 struct net_device *dev; 7103 int i; 7104 7105 unregister_netdevice_notifier(&ipv6_dev_notf); 7106 unregister_pernet_subsys(&addrconf_ops); 7107 ipv6_addr_label_cleanup(); 7108 7109 rtnl_af_unregister(&inet6_ops); 7110 7111 rtnl_lock(); 7112 7113 /* clean dev list */ 7114 for_each_netdev(&init_net, dev) { 7115 if (__in6_dev_get(dev) == NULL) 7116 continue; 7117 addrconf_ifdown(dev, 1); 7118 } 7119 addrconf_ifdown(init_net.loopback_dev, 2); 7120 7121 /* 7122 * Check hash table. 7123 */ 7124 spin_lock_bh(&addrconf_hash_lock); 7125 for (i = 0; i < IN6_ADDR_HSIZE; i++) 7126 WARN_ON(!hlist_empty(&inet6_addr_lst[i])); 7127 spin_unlock_bh(&addrconf_hash_lock); 7128 cancel_delayed_work(&addr_chk_work); 7129 rtnl_unlock(); 7130 7131 destroy_workqueue(addrconf_wq); 7132 } 7133