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