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