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