1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * IPv6 Address [auto]configuration 4 * Linux INET6 implementation 5 * 6 * Authors: 7 * Pedro Roque <roque@di.fc.ul.pt> 8 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru> 9 */ 10 11 /* 12 * Changes: 13 * 14 * Janos Farkas : delete timer on ifdown 15 * <chexum@bankinf.banki.hu> 16 * Andi Kleen : kill double kfree on module 17 * unload. 18 * Maciej W. Rozycki : FDDI support 19 * sekiya@USAGI : Don't send too many RS 20 * packets. 21 * yoshfuji@USAGI : Fixed interval between DAD 22 * packets. 23 * YOSHIFUJI Hideaki @USAGI : improved accuracy of 24 * address validation timer. 25 * YOSHIFUJI Hideaki @USAGI : Privacy Extensions (RFC3041) 26 * support. 27 * Yuji SEKIYA @USAGI : Don't assign a same IPv6 28 * address on a same interface. 29 * YOSHIFUJI Hideaki @USAGI : ARCnet support 30 * YOSHIFUJI Hideaki @USAGI : convert /proc/net/if_inet6 to 31 * seq_file. 32 * YOSHIFUJI Hideaki @USAGI : improved source address 33 * selection; consider scope, 34 * status etc. 35 */ 36 37 #define pr_fmt(fmt) "IPv6: " fmt 38 39 #include <linux/errno.h> 40 #include <linux/types.h> 41 #include <linux/kernel.h> 42 #include <linux/sched/signal.h> 43 #include <linux/socket.h> 44 #include <linux/sockios.h> 45 #include <linux/net.h> 46 #include <linux/inet.h> 47 #include <linux/in6.h> 48 #include <linux/netdevice.h> 49 #include <linux/if_addr.h> 50 #include <linux/if_arp.h> 51 #include <linux/if_arcnet.h> 52 #include <linux/if_infiniband.h> 53 #include <linux/route.h> 54 #include <linux/inetdevice.h> 55 #include <linux/init.h> 56 #include <linux/slab.h> 57 #ifdef CONFIG_SYSCTL 58 #include <linux/sysctl.h> 59 #endif 60 #include <linux/capability.h> 61 #include <linux/delay.h> 62 #include <linux/notifier.h> 63 #include <linux/string.h> 64 #include <linux/hash.h> 65 66 #include <net/net_namespace.h> 67 #include <net/sock.h> 68 #include <net/snmp.h> 69 70 #include <net/6lowpan.h> 71 #include <net/firewire.h> 72 #include <net/ipv6.h> 73 #include <net/protocol.h> 74 #include <net/ndisc.h> 75 #include <net/ip6_route.h> 76 #include <net/addrconf.h> 77 #include <net/tcp.h> 78 #include <net/ip.h> 79 #include <net/netlink.h> 80 #include <net/pkt_sched.h> 81 #include <net/l3mdev.h> 82 #include <linux/if_tunnel.h> 83 #include <linux/rtnetlink.h> 84 #include <linux/netconf.h> 85 #include <linux/random.h> 86 #include <linux/uaccess.h> 87 #include <asm/unaligned.h> 88 89 #include <linux/proc_fs.h> 90 #include <linux/seq_file.h> 91 #include <linux/export.h> 92 93 #define INFINITY_LIFE_TIME 0xFFFFFFFF 94 95 #define IPV6_MAX_STRLEN \ 96 sizeof("ffff:ffff:ffff:ffff:ffff:ffff:255.255.255.255") 97 98 static inline u32 cstamp_delta(unsigned long cstamp) 99 { 100 return (cstamp - INITIAL_JIFFIES) * 100UL / HZ; 101 } 102 103 static inline s32 rfc3315_s14_backoff_init(s32 irt) 104 { 105 /* multiply 'initial retransmission time' by 0.9 .. 1.1 */ 106 u64 tmp = (900000 + prandom_u32() % 200001) * (u64)irt; 107 do_div(tmp, 1000000); 108 return (s32)tmp; 109 } 110 111 static inline s32 rfc3315_s14_backoff_update(s32 rt, s32 mrt) 112 { 113 /* multiply 'retransmission timeout' by 1.9 .. 2.1 */ 114 u64 tmp = (1900000 + prandom_u32() % 200001) * (u64)rt; 115 do_div(tmp, 1000000); 116 if ((s32)tmp > mrt) { 117 /* multiply 'maximum retransmission time' by 0.9 .. 1.1 */ 118 tmp = (900000 + prandom_u32() % 200001) * (u64)mrt; 119 do_div(tmp, 1000000); 120 } 121 return (s32)tmp; 122 } 123 124 #ifdef CONFIG_SYSCTL 125 static int addrconf_sysctl_register(struct inet6_dev *idev); 126 static void addrconf_sysctl_unregister(struct inet6_dev *idev); 127 #else 128 static inline int addrconf_sysctl_register(struct inet6_dev *idev) 129 { 130 return 0; 131 } 132 133 static inline void addrconf_sysctl_unregister(struct inet6_dev *idev) 134 { 135 } 136 #endif 137 138 static void ipv6_regen_rndid(struct inet6_dev *idev); 139 static void ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr); 140 141 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev); 142 static int ipv6_count_addresses(const struct inet6_dev *idev); 143 static int ipv6_generate_stable_address(struct in6_addr *addr, 144 u8 dad_count, 145 const struct inet6_dev *idev); 146 147 #define IN6_ADDR_HSIZE_SHIFT 8 148 #define IN6_ADDR_HSIZE (1 << IN6_ADDR_HSIZE_SHIFT) 149 /* 150 * Configured unicast address hash table 151 */ 152 static struct hlist_head inet6_addr_lst[IN6_ADDR_HSIZE]; 153 static DEFINE_SPINLOCK(addrconf_hash_lock); 154 155 static void addrconf_verify(void); 156 static void addrconf_verify_rtnl(void); 157 static void addrconf_verify_work(struct work_struct *); 158 159 static struct workqueue_struct *addrconf_wq; 160 static DECLARE_DELAYED_WORK(addr_chk_work, addrconf_verify_work); 161 162 static void addrconf_join_anycast(struct inet6_ifaddr *ifp); 163 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp); 164 165 static void addrconf_type_change(struct net_device *dev, 166 unsigned long event); 167 static int addrconf_ifdown(struct net_device *dev, int how); 168 169 static struct fib6_info *addrconf_get_prefix_route(const struct in6_addr *pfx, 170 int plen, 171 const struct net_device *dev, 172 u32 flags, u32 noflags, 173 bool no_gw); 174 175 static void addrconf_dad_start(struct inet6_ifaddr *ifp); 176 static void addrconf_dad_work(struct work_struct *w); 177 static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id, 178 bool send_na); 179 static void addrconf_dad_run(struct inet6_dev *idev, bool restart); 180 static void addrconf_rs_timer(struct timer_list *t); 181 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa); 182 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa); 183 184 static void inet6_prefix_notify(int event, struct inet6_dev *idev, 185 struct prefix_info *pinfo); 186 187 static struct ipv6_devconf ipv6_devconf __read_mostly = { 188 .forwarding = 0, 189 .hop_limit = IPV6_DEFAULT_HOPLIMIT, 190 .mtu6 = IPV6_MIN_MTU, 191 .accept_ra = 1, 192 .accept_redirects = 1, 193 .autoconf = 1, 194 .force_mld_version = 0, 195 .mldv1_unsolicited_report_interval = 10 * HZ, 196 .mldv2_unsolicited_report_interval = HZ, 197 .dad_transmits = 1, 198 .rtr_solicits = MAX_RTR_SOLICITATIONS, 199 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL, 200 .rtr_solicit_max_interval = RTR_SOLICITATION_MAX_INTERVAL, 201 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY, 202 .use_tempaddr = 0, 203 .temp_valid_lft = TEMP_VALID_LIFETIME, 204 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME, 205 .regen_max_retry = REGEN_MAX_RETRY, 206 .max_desync_factor = MAX_DESYNC_FACTOR, 207 .max_addresses = IPV6_MAX_ADDRESSES, 208 .accept_ra_defrtr = 1, 209 .accept_ra_from_local = 0, 210 .accept_ra_min_hop_limit= 1, 211 .accept_ra_pinfo = 1, 212 #ifdef CONFIG_IPV6_ROUTER_PREF 213 .accept_ra_rtr_pref = 1, 214 .rtr_probe_interval = 60 * HZ, 215 #ifdef CONFIG_IPV6_ROUTE_INFO 216 .accept_ra_rt_info_min_plen = 0, 217 .accept_ra_rt_info_max_plen = 0, 218 #endif 219 #endif 220 .proxy_ndp = 0, 221 .accept_source_route = 0, /* we do not accept RH0 by default. */ 222 .disable_ipv6 = 0, 223 .accept_dad = 0, 224 .suppress_frag_ndisc = 1, 225 .accept_ra_mtu = 1, 226 .stable_secret = { 227 .initialized = false, 228 }, 229 .use_oif_addrs_only = 0, 230 .ignore_routes_with_linkdown = 0, 231 .keep_addr_on_down = 0, 232 .seg6_enabled = 0, 233 #ifdef CONFIG_IPV6_SEG6_HMAC 234 .seg6_require_hmac = 0, 235 #endif 236 .enhanced_dad = 1, 237 .addr_gen_mode = IN6_ADDR_GEN_MODE_EUI64, 238 .disable_policy = 0, 239 }; 240 241 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = { 242 .forwarding = 0, 243 .hop_limit = IPV6_DEFAULT_HOPLIMIT, 244 .mtu6 = IPV6_MIN_MTU, 245 .accept_ra = 1, 246 .accept_redirects = 1, 247 .autoconf = 1, 248 .force_mld_version = 0, 249 .mldv1_unsolicited_report_interval = 10 * HZ, 250 .mldv2_unsolicited_report_interval = HZ, 251 .dad_transmits = 1, 252 .rtr_solicits = MAX_RTR_SOLICITATIONS, 253 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL, 254 .rtr_solicit_max_interval = RTR_SOLICITATION_MAX_INTERVAL, 255 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY, 256 .use_tempaddr = 0, 257 .temp_valid_lft = TEMP_VALID_LIFETIME, 258 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME, 259 .regen_max_retry = REGEN_MAX_RETRY, 260 .max_desync_factor = MAX_DESYNC_FACTOR, 261 .max_addresses = IPV6_MAX_ADDRESSES, 262 .accept_ra_defrtr = 1, 263 .accept_ra_from_local = 0, 264 .accept_ra_min_hop_limit= 1, 265 .accept_ra_pinfo = 1, 266 #ifdef CONFIG_IPV6_ROUTER_PREF 267 .accept_ra_rtr_pref = 1, 268 .rtr_probe_interval = 60 * HZ, 269 #ifdef CONFIG_IPV6_ROUTE_INFO 270 .accept_ra_rt_info_min_plen = 0, 271 .accept_ra_rt_info_max_plen = 0, 272 #endif 273 #endif 274 .proxy_ndp = 0, 275 .accept_source_route = 0, /* we do not accept RH0 by default. */ 276 .disable_ipv6 = 0, 277 .accept_dad = 1, 278 .suppress_frag_ndisc = 1, 279 .accept_ra_mtu = 1, 280 .stable_secret = { 281 .initialized = false, 282 }, 283 .use_oif_addrs_only = 0, 284 .ignore_routes_with_linkdown = 0, 285 .keep_addr_on_down = 0, 286 .seg6_enabled = 0, 287 #ifdef CONFIG_IPV6_SEG6_HMAC 288 .seg6_require_hmac = 0, 289 #endif 290 .enhanced_dad = 1, 291 .addr_gen_mode = IN6_ADDR_GEN_MODE_EUI64, 292 .disable_policy = 0, 293 }; 294 295 /* Check if link is ready: is it up and is a valid qdisc available */ 296 static inline bool addrconf_link_ready(const struct net_device *dev) 297 { 298 return netif_oper_up(dev) && !qdisc_tx_is_noop(dev); 299 } 300 301 static void addrconf_del_rs_timer(struct inet6_dev *idev) 302 { 303 if (del_timer(&idev->rs_timer)) 304 __in6_dev_put(idev); 305 } 306 307 static void addrconf_del_dad_work(struct inet6_ifaddr *ifp) 308 { 309 if (cancel_delayed_work(&ifp->dad_work)) 310 __in6_ifa_put(ifp); 311 } 312 313 static void addrconf_mod_rs_timer(struct inet6_dev *idev, 314 unsigned long when) 315 { 316 if (!timer_pending(&idev->rs_timer)) 317 in6_dev_hold(idev); 318 mod_timer(&idev->rs_timer, jiffies + when); 319 } 320 321 static void addrconf_mod_dad_work(struct inet6_ifaddr *ifp, 322 unsigned long delay) 323 { 324 in6_ifa_hold(ifp); 325 if (mod_delayed_work(addrconf_wq, &ifp->dad_work, delay)) 326 in6_ifa_put(ifp); 327 } 328 329 static int snmp6_alloc_dev(struct inet6_dev *idev) 330 { 331 int i; 332 333 idev->stats.ipv6 = alloc_percpu(struct ipstats_mib); 334 if (!idev->stats.ipv6) 335 goto err_ip; 336 337 for_each_possible_cpu(i) { 338 struct ipstats_mib *addrconf_stats; 339 addrconf_stats = per_cpu_ptr(idev->stats.ipv6, i); 340 u64_stats_init(&addrconf_stats->syncp); 341 } 342 343 344 idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device), 345 GFP_KERNEL); 346 if (!idev->stats.icmpv6dev) 347 goto err_icmp; 348 idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device), 349 GFP_KERNEL); 350 if (!idev->stats.icmpv6msgdev) 351 goto err_icmpmsg; 352 353 return 0; 354 355 err_icmpmsg: 356 kfree(idev->stats.icmpv6dev); 357 err_icmp: 358 free_percpu(idev->stats.ipv6); 359 err_ip: 360 return -ENOMEM; 361 } 362 363 static struct inet6_dev *ipv6_add_dev(struct net_device *dev) 364 { 365 struct inet6_dev *ndev; 366 int err = -ENOMEM; 367 368 ASSERT_RTNL(); 369 370 if (dev->mtu < IPV6_MIN_MTU) 371 return ERR_PTR(-EINVAL); 372 373 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL); 374 if (!ndev) 375 return ERR_PTR(err); 376 377 rwlock_init(&ndev->lock); 378 ndev->dev = dev; 379 INIT_LIST_HEAD(&ndev->addr_list); 380 timer_setup(&ndev->rs_timer, addrconf_rs_timer, 0); 381 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf)); 382 383 if (ndev->cnf.stable_secret.initialized) 384 ndev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY; 385 386 ndev->cnf.mtu6 = dev->mtu; 387 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl); 388 if (!ndev->nd_parms) { 389 kfree(ndev); 390 return ERR_PTR(err); 391 } 392 if (ndev->cnf.forwarding) 393 dev_disable_lro(dev); 394 /* We refer to the device */ 395 dev_hold(dev); 396 397 if (snmp6_alloc_dev(ndev) < 0) { 398 netdev_dbg(dev, "%s: cannot allocate memory for statistics\n", 399 __func__); 400 neigh_parms_release(&nd_tbl, ndev->nd_parms); 401 dev_put(dev); 402 kfree(ndev); 403 return ERR_PTR(err); 404 } 405 406 if (snmp6_register_dev(ndev) < 0) { 407 netdev_dbg(dev, "%s: cannot create /proc/net/dev_snmp6/%s\n", 408 __func__, dev->name); 409 goto err_release; 410 } 411 412 /* One reference from device. */ 413 refcount_set(&ndev->refcnt, 1); 414 415 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK)) 416 ndev->cnf.accept_dad = -1; 417 418 #if IS_ENABLED(CONFIG_IPV6_SIT) 419 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) { 420 pr_info("%s: Disabled Multicast RS\n", dev->name); 421 ndev->cnf.rtr_solicits = 0; 422 } 423 #endif 424 425 INIT_LIST_HEAD(&ndev->tempaddr_list); 426 ndev->desync_factor = U32_MAX; 427 if ((dev->flags&IFF_LOOPBACK) || 428 dev->type == ARPHRD_TUNNEL || 429 dev->type == ARPHRD_TUNNEL6 || 430 dev->type == ARPHRD_SIT || 431 dev->type == ARPHRD_NONE) { 432 ndev->cnf.use_tempaddr = -1; 433 } else 434 ipv6_regen_rndid(ndev); 435 436 ndev->token = in6addr_any; 437 438 if (netif_running(dev) && addrconf_link_ready(dev)) 439 ndev->if_flags |= IF_READY; 440 441 ipv6_mc_init_dev(ndev); 442 ndev->tstamp = jiffies; 443 err = addrconf_sysctl_register(ndev); 444 if (err) { 445 ipv6_mc_destroy_dev(ndev); 446 snmp6_unregister_dev(ndev); 447 goto err_release; 448 } 449 /* protected by rtnl_lock */ 450 rcu_assign_pointer(dev->ip6_ptr, ndev); 451 452 /* Join interface-local all-node multicast group */ 453 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allnodes); 454 455 /* Join all-node multicast group */ 456 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes); 457 458 /* Join all-router multicast group if forwarding is set */ 459 if (ndev->cnf.forwarding && (dev->flags & IFF_MULTICAST)) 460 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters); 461 462 return ndev; 463 464 err_release: 465 neigh_parms_release(&nd_tbl, ndev->nd_parms); 466 ndev->dead = 1; 467 in6_dev_finish_destroy(ndev); 468 return ERR_PTR(err); 469 } 470 471 static struct inet6_dev *ipv6_find_idev(struct net_device *dev) 472 { 473 struct inet6_dev *idev; 474 475 ASSERT_RTNL(); 476 477 idev = __in6_dev_get(dev); 478 if (!idev) { 479 idev = ipv6_add_dev(dev); 480 if (IS_ERR(idev)) 481 return idev; 482 } 483 484 if (dev->flags&IFF_UP) 485 ipv6_mc_up(idev); 486 return idev; 487 } 488 489 static int inet6_netconf_msgsize_devconf(int type) 490 { 491 int size = NLMSG_ALIGN(sizeof(struct netconfmsg)) 492 + nla_total_size(4); /* NETCONFA_IFINDEX */ 493 bool all = false; 494 495 if (type == NETCONFA_ALL) 496 all = true; 497 498 if (all || type == NETCONFA_FORWARDING) 499 size += nla_total_size(4); 500 #ifdef CONFIG_IPV6_MROUTE 501 if (all || type == NETCONFA_MC_FORWARDING) 502 size += nla_total_size(4); 503 #endif 504 if (all || type == NETCONFA_PROXY_NEIGH) 505 size += nla_total_size(4); 506 507 if (all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN) 508 size += nla_total_size(4); 509 510 return size; 511 } 512 513 static int inet6_netconf_fill_devconf(struct sk_buff *skb, int ifindex, 514 struct ipv6_devconf *devconf, u32 portid, 515 u32 seq, int event, unsigned int flags, 516 int type) 517 { 518 struct nlmsghdr *nlh; 519 struct netconfmsg *ncm; 520 bool all = false; 521 522 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg), 523 flags); 524 if (!nlh) 525 return -EMSGSIZE; 526 527 if (type == NETCONFA_ALL) 528 all = true; 529 530 ncm = nlmsg_data(nlh); 531 ncm->ncm_family = AF_INET6; 532 533 if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0) 534 goto nla_put_failure; 535 536 if (!devconf) 537 goto out; 538 539 if ((all || type == NETCONFA_FORWARDING) && 540 nla_put_s32(skb, NETCONFA_FORWARDING, devconf->forwarding) < 0) 541 goto nla_put_failure; 542 #ifdef CONFIG_IPV6_MROUTE 543 if ((all || type == NETCONFA_MC_FORWARDING) && 544 nla_put_s32(skb, NETCONFA_MC_FORWARDING, 545 devconf->mc_forwarding) < 0) 546 goto nla_put_failure; 547 #endif 548 if ((all || type == NETCONFA_PROXY_NEIGH) && 549 nla_put_s32(skb, NETCONFA_PROXY_NEIGH, devconf->proxy_ndp) < 0) 550 goto nla_put_failure; 551 552 if ((all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN) && 553 nla_put_s32(skb, NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN, 554 devconf->ignore_routes_with_linkdown) < 0) 555 goto nla_put_failure; 556 557 out: 558 nlmsg_end(skb, nlh); 559 return 0; 560 561 nla_put_failure: 562 nlmsg_cancel(skb, nlh); 563 return -EMSGSIZE; 564 } 565 566 void inet6_netconf_notify_devconf(struct net *net, int event, int type, 567 int ifindex, struct ipv6_devconf *devconf) 568 { 569 struct sk_buff *skb; 570 int err = -ENOBUFS; 571 572 skb = nlmsg_new(inet6_netconf_msgsize_devconf(type), GFP_KERNEL); 573 if (!skb) 574 goto errout; 575 576 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 0, 0, 577 event, 0, type); 578 if (err < 0) { 579 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */ 580 WARN_ON(err == -EMSGSIZE); 581 kfree_skb(skb); 582 goto errout; 583 } 584 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_NETCONF, NULL, GFP_KERNEL); 585 return; 586 errout: 587 rtnl_set_sk_err(net, RTNLGRP_IPV6_NETCONF, err); 588 } 589 590 static const struct nla_policy devconf_ipv6_policy[NETCONFA_MAX+1] = { 591 [NETCONFA_IFINDEX] = { .len = sizeof(int) }, 592 [NETCONFA_FORWARDING] = { .len = sizeof(int) }, 593 [NETCONFA_PROXY_NEIGH] = { .len = sizeof(int) }, 594 [NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN] = { .len = sizeof(int) }, 595 }; 596 597 static int inet6_netconf_valid_get_req(struct sk_buff *skb, 598 const struct nlmsghdr *nlh, 599 struct nlattr **tb, 600 struct netlink_ext_ack *extack) 601 { 602 int i, err; 603 604 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(struct netconfmsg))) { 605 NL_SET_ERR_MSG_MOD(extack, "Invalid header for netconf get request"); 606 return -EINVAL; 607 } 608 609 if (!netlink_strict_get_check(skb)) 610 return nlmsg_parse_deprecated(nlh, sizeof(struct netconfmsg), 611 tb, NETCONFA_MAX, 612 devconf_ipv6_policy, extack); 613 614 err = nlmsg_parse_deprecated_strict(nlh, sizeof(struct netconfmsg), 615 tb, NETCONFA_MAX, 616 devconf_ipv6_policy, extack); 617 if (err) 618 return err; 619 620 for (i = 0; i <= NETCONFA_MAX; i++) { 621 if (!tb[i]) 622 continue; 623 624 switch (i) { 625 case NETCONFA_IFINDEX: 626 break; 627 default: 628 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in netconf get request"); 629 return -EINVAL; 630 } 631 } 632 633 return 0; 634 } 635 636 static int inet6_netconf_get_devconf(struct sk_buff *in_skb, 637 struct nlmsghdr *nlh, 638 struct netlink_ext_ack *extack) 639 { 640 struct net *net = sock_net(in_skb->sk); 641 struct nlattr *tb[NETCONFA_MAX+1]; 642 struct inet6_dev *in6_dev = NULL; 643 struct net_device *dev = NULL; 644 struct sk_buff *skb; 645 struct ipv6_devconf *devconf; 646 int ifindex; 647 int err; 648 649 err = inet6_netconf_valid_get_req(in_skb, nlh, tb, extack); 650 if (err < 0) 651 return err; 652 653 if (!tb[NETCONFA_IFINDEX]) 654 return -EINVAL; 655 656 err = -EINVAL; 657 ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]); 658 switch (ifindex) { 659 case NETCONFA_IFINDEX_ALL: 660 devconf = net->ipv6.devconf_all; 661 break; 662 case NETCONFA_IFINDEX_DEFAULT: 663 devconf = net->ipv6.devconf_dflt; 664 break; 665 default: 666 dev = dev_get_by_index(net, ifindex); 667 if (!dev) 668 return -EINVAL; 669 in6_dev = in6_dev_get(dev); 670 if (!in6_dev) 671 goto errout; 672 devconf = &in6_dev->cnf; 673 break; 674 } 675 676 err = -ENOBUFS; 677 skb = nlmsg_new(inet6_netconf_msgsize_devconf(NETCONFA_ALL), GFP_KERNEL); 678 if (!skb) 679 goto errout; 680 681 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 682 NETLINK_CB(in_skb).portid, 683 nlh->nlmsg_seq, RTM_NEWNETCONF, 0, 684 NETCONFA_ALL); 685 if (err < 0) { 686 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */ 687 WARN_ON(err == -EMSGSIZE); 688 kfree_skb(skb); 689 goto errout; 690 } 691 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid); 692 errout: 693 if (in6_dev) 694 in6_dev_put(in6_dev); 695 if (dev) 696 dev_put(dev); 697 return err; 698 } 699 700 static int inet6_netconf_dump_devconf(struct sk_buff *skb, 701 struct netlink_callback *cb) 702 { 703 const struct nlmsghdr *nlh = cb->nlh; 704 struct net *net = sock_net(skb->sk); 705 int h, s_h; 706 int idx, s_idx; 707 struct net_device *dev; 708 struct inet6_dev *idev; 709 struct hlist_head *head; 710 711 if (cb->strict_check) { 712 struct netlink_ext_ack *extack = cb->extack; 713 struct netconfmsg *ncm; 714 715 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ncm))) { 716 NL_SET_ERR_MSG_MOD(extack, "Invalid header for netconf dump request"); 717 return -EINVAL; 718 } 719 720 if (nlmsg_attrlen(nlh, sizeof(*ncm))) { 721 NL_SET_ERR_MSG_MOD(extack, "Invalid data after header in netconf dump request"); 722 return -EINVAL; 723 } 724 } 725 726 s_h = cb->args[0]; 727 s_idx = idx = cb->args[1]; 728 729 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 730 idx = 0; 731 head = &net->dev_index_head[h]; 732 rcu_read_lock(); 733 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ 734 net->dev_base_seq; 735 hlist_for_each_entry_rcu(dev, head, index_hlist) { 736 if (idx < s_idx) 737 goto cont; 738 idev = __in6_dev_get(dev); 739 if (!idev) 740 goto cont; 741 742 if (inet6_netconf_fill_devconf(skb, dev->ifindex, 743 &idev->cnf, 744 NETLINK_CB(cb->skb).portid, 745 nlh->nlmsg_seq, 746 RTM_NEWNETCONF, 747 NLM_F_MULTI, 748 NETCONFA_ALL) < 0) { 749 rcu_read_unlock(); 750 goto done; 751 } 752 nl_dump_check_consistent(cb, nlmsg_hdr(skb)); 753 cont: 754 idx++; 755 } 756 rcu_read_unlock(); 757 } 758 if (h == NETDEV_HASHENTRIES) { 759 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL, 760 net->ipv6.devconf_all, 761 NETLINK_CB(cb->skb).portid, 762 nlh->nlmsg_seq, 763 RTM_NEWNETCONF, NLM_F_MULTI, 764 NETCONFA_ALL) < 0) 765 goto done; 766 else 767 h++; 768 } 769 if (h == NETDEV_HASHENTRIES + 1) { 770 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT, 771 net->ipv6.devconf_dflt, 772 NETLINK_CB(cb->skb).portid, 773 nlh->nlmsg_seq, 774 RTM_NEWNETCONF, NLM_F_MULTI, 775 NETCONFA_ALL) < 0) 776 goto done; 777 else 778 h++; 779 } 780 done: 781 cb->args[0] = h; 782 cb->args[1] = idx; 783 784 return skb->len; 785 } 786 787 #ifdef CONFIG_SYSCTL 788 static void dev_forward_change(struct inet6_dev *idev) 789 { 790 struct net_device *dev; 791 struct inet6_ifaddr *ifa; 792 793 if (!idev) 794 return; 795 dev = idev->dev; 796 if (idev->cnf.forwarding) 797 dev_disable_lro(dev); 798 if (dev->flags & IFF_MULTICAST) { 799 if (idev->cnf.forwarding) { 800 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters); 801 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allrouters); 802 ipv6_dev_mc_inc(dev, &in6addr_sitelocal_allrouters); 803 } else { 804 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters); 805 ipv6_dev_mc_dec(dev, &in6addr_interfacelocal_allrouters); 806 ipv6_dev_mc_dec(dev, &in6addr_sitelocal_allrouters); 807 } 808 } 809 810 list_for_each_entry(ifa, &idev->addr_list, if_list) { 811 if (ifa->flags&IFA_F_TENTATIVE) 812 continue; 813 if (idev->cnf.forwarding) 814 addrconf_join_anycast(ifa); 815 else 816 addrconf_leave_anycast(ifa); 817 } 818 inet6_netconf_notify_devconf(dev_net(dev), RTM_NEWNETCONF, 819 NETCONFA_FORWARDING, 820 dev->ifindex, &idev->cnf); 821 } 822 823 824 static void addrconf_forward_change(struct net *net, __s32 newf) 825 { 826 struct net_device *dev; 827 struct inet6_dev *idev; 828 829 for_each_netdev(net, dev) { 830 idev = __in6_dev_get(dev); 831 if (idev) { 832 int changed = (!idev->cnf.forwarding) ^ (!newf); 833 idev->cnf.forwarding = newf; 834 if (changed) 835 dev_forward_change(idev); 836 } 837 } 838 } 839 840 static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf) 841 { 842 struct net *net; 843 int old; 844 845 if (!rtnl_trylock()) 846 return restart_syscall(); 847 848 net = (struct net *)table->extra2; 849 old = *p; 850 *p = newf; 851 852 if (p == &net->ipv6.devconf_dflt->forwarding) { 853 if ((!newf) ^ (!old)) 854 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 855 NETCONFA_FORWARDING, 856 NETCONFA_IFINDEX_DEFAULT, 857 net->ipv6.devconf_dflt); 858 rtnl_unlock(); 859 return 0; 860 } 861 862 if (p == &net->ipv6.devconf_all->forwarding) { 863 int old_dflt = net->ipv6.devconf_dflt->forwarding; 864 865 net->ipv6.devconf_dflt->forwarding = newf; 866 if ((!newf) ^ (!old_dflt)) 867 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 868 NETCONFA_FORWARDING, 869 NETCONFA_IFINDEX_DEFAULT, 870 net->ipv6.devconf_dflt); 871 872 addrconf_forward_change(net, newf); 873 if ((!newf) ^ (!old)) 874 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 875 NETCONFA_FORWARDING, 876 NETCONFA_IFINDEX_ALL, 877 net->ipv6.devconf_all); 878 } else if ((!newf) ^ (!old)) 879 dev_forward_change((struct inet6_dev *)table->extra1); 880 rtnl_unlock(); 881 882 if (newf) 883 rt6_purge_dflt_routers(net); 884 return 1; 885 } 886 887 static void addrconf_linkdown_change(struct net *net, __s32 newf) 888 { 889 struct net_device *dev; 890 struct inet6_dev *idev; 891 892 for_each_netdev(net, dev) { 893 idev = __in6_dev_get(dev); 894 if (idev) { 895 int changed = (!idev->cnf.ignore_routes_with_linkdown) ^ (!newf); 896 897 idev->cnf.ignore_routes_with_linkdown = newf; 898 if (changed) 899 inet6_netconf_notify_devconf(dev_net(dev), 900 RTM_NEWNETCONF, 901 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN, 902 dev->ifindex, 903 &idev->cnf); 904 } 905 } 906 } 907 908 static int addrconf_fixup_linkdown(struct ctl_table *table, int *p, int newf) 909 { 910 struct net *net; 911 int old; 912 913 if (!rtnl_trylock()) 914 return restart_syscall(); 915 916 net = (struct net *)table->extra2; 917 old = *p; 918 *p = newf; 919 920 if (p == &net->ipv6.devconf_dflt->ignore_routes_with_linkdown) { 921 if ((!newf) ^ (!old)) 922 inet6_netconf_notify_devconf(net, 923 RTM_NEWNETCONF, 924 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN, 925 NETCONFA_IFINDEX_DEFAULT, 926 net->ipv6.devconf_dflt); 927 rtnl_unlock(); 928 return 0; 929 } 930 931 if (p == &net->ipv6.devconf_all->ignore_routes_with_linkdown) { 932 net->ipv6.devconf_dflt->ignore_routes_with_linkdown = newf; 933 addrconf_linkdown_change(net, newf); 934 if ((!newf) ^ (!old)) 935 inet6_netconf_notify_devconf(net, 936 RTM_NEWNETCONF, 937 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN, 938 NETCONFA_IFINDEX_ALL, 939 net->ipv6.devconf_all); 940 } 941 rtnl_unlock(); 942 943 return 1; 944 } 945 946 #endif 947 948 /* Nobody refers to this ifaddr, destroy it */ 949 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp) 950 { 951 WARN_ON(!hlist_unhashed(&ifp->addr_lst)); 952 953 #ifdef NET_REFCNT_DEBUG 954 pr_debug("%s\n", __func__); 955 #endif 956 957 in6_dev_put(ifp->idev); 958 959 if (cancel_delayed_work(&ifp->dad_work)) 960 pr_notice("delayed DAD work was pending while freeing ifa=%p\n", 961 ifp); 962 963 if (ifp->state != INET6_IFADDR_STATE_DEAD) { 964 pr_warn("Freeing alive inet6 address %p\n", ifp); 965 return; 966 } 967 968 kfree_rcu(ifp, rcu); 969 } 970 971 static void 972 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp) 973 { 974 struct list_head *p; 975 int ifp_scope = ipv6_addr_src_scope(&ifp->addr); 976 977 /* 978 * Each device address list is sorted in order of scope - 979 * global before linklocal. 980 */ 981 list_for_each(p, &idev->addr_list) { 982 struct inet6_ifaddr *ifa 983 = list_entry(p, struct inet6_ifaddr, if_list); 984 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr)) 985 break; 986 } 987 988 list_add_tail_rcu(&ifp->if_list, p); 989 } 990 991 static u32 inet6_addr_hash(const struct net *net, const struct in6_addr *addr) 992 { 993 u32 val = ipv6_addr_hash(addr) ^ net_hash_mix(net); 994 995 return hash_32(val, IN6_ADDR_HSIZE_SHIFT); 996 } 997 998 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr, 999 struct net_device *dev, unsigned int hash) 1000 { 1001 struct inet6_ifaddr *ifp; 1002 1003 hlist_for_each_entry(ifp, &inet6_addr_lst[hash], addr_lst) { 1004 if (!net_eq(dev_net(ifp->idev->dev), net)) 1005 continue; 1006 if (ipv6_addr_equal(&ifp->addr, addr)) { 1007 if (!dev || ifp->idev->dev == dev) 1008 return true; 1009 } 1010 } 1011 return false; 1012 } 1013 1014 static int ipv6_add_addr_hash(struct net_device *dev, struct inet6_ifaddr *ifa) 1015 { 1016 unsigned int hash = inet6_addr_hash(dev_net(dev), &ifa->addr); 1017 int err = 0; 1018 1019 spin_lock(&addrconf_hash_lock); 1020 1021 /* Ignore adding duplicate addresses on an interface */ 1022 if (ipv6_chk_same_addr(dev_net(dev), &ifa->addr, dev, hash)) { 1023 netdev_dbg(dev, "ipv6_add_addr: already assigned\n"); 1024 err = -EEXIST; 1025 } else { 1026 hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]); 1027 } 1028 1029 spin_unlock(&addrconf_hash_lock); 1030 1031 return err; 1032 } 1033 1034 /* On success it returns ifp with increased reference count */ 1035 1036 static struct inet6_ifaddr * 1037 ipv6_add_addr(struct inet6_dev *idev, struct ifa6_config *cfg, 1038 bool can_block, struct netlink_ext_ack *extack) 1039 { 1040 gfp_t gfp_flags = can_block ? GFP_KERNEL : GFP_ATOMIC; 1041 int addr_type = ipv6_addr_type(cfg->pfx); 1042 struct net *net = dev_net(idev->dev); 1043 struct inet6_ifaddr *ifa = NULL; 1044 struct fib6_info *f6i = NULL; 1045 int err = 0; 1046 1047 if (addr_type == IPV6_ADDR_ANY || 1048 (addr_type & IPV6_ADDR_MULTICAST && 1049 !(cfg->ifa_flags & IFA_F_MCAUTOJOIN)) || 1050 (!(idev->dev->flags & IFF_LOOPBACK) && 1051 !netif_is_l3_master(idev->dev) && 1052 addr_type & IPV6_ADDR_LOOPBACK)) 1053 return ERR_PTR(-EADDRNOTAVAIL); 1054 1055 if (idev->dead) { 1056 err = -ENODEV; /*XXX*/ 1057 goto out; 1058 } 1059 1060 if (idev->cnf.disable_ipv6) { 1061 err = -EACCES; 1062 goto out; 1063 } 1064 1065 /* validator notifier needs to be blocking; 1066 * do not call in atomic context 1067 */ 1068 if (can_block) { 1069 struct in6_validator_info i6vi = { 1070 .i6vi_addr = *cfg->pfx, 1071 .i6vi_dev = idev, 1072 .extack = extack, 1073 }; 1074 1075 err = inet6addr_validator_notifier_call_chain(NETDEV_UP, &i6vi); 1076 err = notifier_to_errno(err); 1077 if (err < 0) 1078 goto out; 1079 } 1080 1081 ifa = kzalloc(sizeof(*ifa), gfp_flags); 1082 if (!ifa) { 1083 err = -ENOBUFS; 1084 goto out; 1085 } 1086 1087 f6i = addrconf_f6i_alloc(net, idev, cfg->pfx, false, gfp_flags); 1088 if (IS_ERR(f6i)) { 1089 err = PTR_ERR(f6i); 1090 f6i = NULL; 1091 goto out; 1092 } 1093 1094 if (net->ipv6.devconf_all->disable_policy || 1095 idev->cnf.disable_policy) 1096 f6i->dst_nopolicy = true; 1097 1098 neigh_parms_data_state_setall(idev->nd_parms); 1099 1100 ifa->addr = *cfg->pfx; 1101 if (cfg->peer_pfx) 1102 ifa->peer_addr = *cfg->peer_pfx; 1103 1104 spin_lock_init(&ifa->lock); 1105 INIT_DELAYED_WORK(&ifa->dad_work, addrconf_dad_work); 1106 INIT_HLIST_NODE(&ifa->addr_lst); 1107 ifa->scope = cfg->scope; 1108 ifa->prefix_len = cfg->plen; 1109 ifa->rt_priority = cfg->rt_priority; 1110 ifa->flags = cfg->ifa_flags; 1111 /* No need to add the TENTATIVE flag for addresses with NODAD */ 1112 if (!(cfg->ifa_flags & IFA_F_NODAD)) 1113 ifa->flags |= IFA_F_TENTATIVE; 1114 ifa->valid_lft = cfg->valid_lft; 1115 ifa->prefered_lft = cfg->preferred_lft; 1116 ifa->cstamp = ifa->tstamp = jiffies; 1117 ifa->tokenized = false; 1118 1119 ifa->rt = f6i; 1120 1121 ifa->idev = idev; 1122 in6_dev_hold(idev); 1123 1124 /* For caller */ 1125 refcount_set(&ifa->refcnt, 1); 1126 1127 rcu_read_lock_bh(); 1128 1129 err = ipv6_add_addr_hash(idev->dev, ifa); 1130 if (err < 0) { 1131 rcu_read_unlock_bh(); 1132 goto out; 1133 } 1134 1135 write_lock(&idev->lock); 1136 1137 /* Add to inet6_dev unicast addr list. */ 1138 ipv6_link_dev_addr(idev, ifa); 1139 1140 if (ifa->flags&IFA_F_TEMPORARY) { 1141 list_add(&ifa->tmp_list, &idev->tempaddr_list); 1142 in6_ifa_hold(ifa); 1143 } 1144 1145 in6_ifa_hold(ifa); 1146 write_unlock(&idev->lock); 1147 1148 rcu_read_unlock_bh(); 1149 1150 inet6addr_notifier_call_chain(NETDEV_UP, ifa); 1151 out: 1152 if (unlikely(err < 0)) { 1153 fib6_info_release(f6i); 1154 1155 if (ifa) { 1156 if (ifa->idev) 1157 in6_dev_put(ifa->idev); 1158 kfree(ifa); 1159 } 1160 ifa = ERR_PTR(err); 1161 } 1162 1163 return ifa; 1164 } 1165 1166 enum cleanup_prefix_rt_t { 1167 CLEANUP_PREFIX_RT_NOP, /* no cleanup action for prefix route */ 1168 CLEANUP_PREFIX_RT_DEL, /* delete the prefix route */ 1169 CLEANUP_PREFIX_RT_EXPIRE, /* update the lifetime of the prefix route */ 1170 }; 1171 1172 /* 1173 * Check, whether the prefix for ifp would still need a prefix route 1174 * after deleting ifp. The function returns one of the CLEANUP_PREFIX_RT_* 1175 * constants. 1176 * 1177 * 1) we don't purge prefix if address was not permanent. 1178 * prefix is managed by its own lifetime. 1179 * 2) we also don't purge, if the address was IFA_F_NOPREFIXROUTE. 1180 * 3) if there are no addresses, delete prefix. 1181 * 4) if there are still other permanent address(es), 1182 * corresponding prefix is still permanent. 1183 * 5) if there are still other addresses with IFA_F_NOPREFIXROUTE, 1184 * don't purge the prefix, assume user space is managing it. 1185 * 6) otherwise, update prefix lifetime to the 1186 * longest valid lifetime among the corresponding 1187 * addresses on the device. 1188 * Note: subsequent RA will update lifetime. 1189 **/ 1190 static enum cleanup_prefix_rt_t 1191 check_cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long *expires) 1192 { 1193 struct inet6_ifaddr *ifa; 1194 struct inet6_dev *idev = ifp->idev; 1195 unsigned long lifetime; 1196 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_DEL; 1197 1198 *expires = jiffies; 1199 1200 list_for_each_entry(ifa, &idev->addr_list, if_list) { 1201 if (ifa == ifp) 1202 continue; 1203 if (ifa->prefix_len != ifp->prefix_len || 1204 !ipv6_prefix_equal(&ifa->addr, &ifp->addr, 1205 ifp->prefix_len)) 1206 continue; 1207 if (ifa->flags & (IFA_F_PERMANENT | IFA_F_NOPREFIXROUTE)) 1208 return CLEANUP_PREFIX_RT_NOP; 1209 1210 action = CLEANUP_PREFIX_RT_EXPIRE; 1211 1212 spin_lock(&ifa->lock); 1213 1214 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ); 1215 /* 1216 * Note: Because this address is 1217 * not permanent, lifetime < 1218 * LONG_MAX / HZ here. 1219 */ 1220 if (time_before(*expires, ifa->tstamp + lifetime * HZ)) 1221 *expires = ifa->tstamp + lifetime * HZ; 1222 spin_unlock(&ifa->lock); 1223 } 1224 1225 return action; 1226 } 1227 1228 static void 1229 cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long expires, 1230 bool del_rt, bool del_peer) 1231 { 1232 struct fib6_info *f6i; 1233 1234 f6i = addrconf_get_prefix_route(del_peer ? &ifp->peer_addr : &ifp->addr, 1235 ifp->prefix_len, 1236 ifp->idev->dev, 0, RTF_DEFAULT, true); 1237 if (f6i) { 1238 if (del_rt) 1239 ip6_del_rt(dev_net(ifp->idev->dev), f6i); 1240 else { 1241 if (!(f6i->fib6_flags & RTF_EXPIRES)) 1242 fib6_set_expires(f6i, expires); 1243 fib6_info_release(f6i); 1244 } 1245 } 1246 } 1247 1248 1249 /* This function wants to get referenced ifp and releases it before return */ 1250 1251 static void ipv6_del_addr(struct inet6_ifaddr *ifp) 1252 { 1253 int state; 1254 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_NOP; 1255 unsigned long expires; 1256 1257 ASSERT_RTNL(); 1258 1259 spin_lock_bh(&ifp->lock); 1260 state = ifp->state; 1261 ifp->state = INET6_IFADDR_STATE_DEAD; 1262 spin_unlock_bh(&ifp->lock); 1263 1264 if (state == INET6_IFADDR_STATE_DEAD) 1265 goto out; 1266 1267 spin_lock_bh(&addrconf_hash_lock); 1268 hlist_del_init_rcu(&ifp->addr_lst); 1269 spin_unlock_bh(&addrconf_hash_lock); 1270 1271 write_lock_bh(&ifp->idev->lock); 1272 1273 if (ifp->flags&IFA_F_TEMPORARY) { 1274 list_del(&ifp->tmp_list); 1275 if (ifp->ifpub) { 1276 in6_ifa_put(ifp->ifpub); 1277 ifp->ifpub = NULL; 1278 } 1279 __in6_ifa_put(ifp); 1280 } 1281 1282 if (ifp->flags & IFA_F_PERMANENT && !(ifp->flags & IFA_F_NOPREFIXROUTE)) 1283 action = check_cleanup_prefix_route(ifp, &expires); 1284 1285 list_del_rcu(&ifp->if_list); 1286 __in6_ifa_put(ifp); 1287 1288 write_unlock_bh(&ifp->idev->lock); 1289 1290 addrconf_del_dad_work(ifp); 1291 1292 ipv6_ifa_notify(RTM_DELADDR, ifp); 1293 1294 inet6addr_notifier_call_chain(NETDEV_DOWN, ifp); 1295 1296 if (action != CLEANUP_PREFIX_RT_NOP) { 1297 cleanup_prefix_route(ifp, expires, 1298 action == CLEANUP_PREFIX_RT_DEL, false); 1299 } 1300 1301 /* clean up prefsrc entries */ 1302 rt6_remove_prefsrc(ifp); 1303 out: 1304 in6_ifa_put(ifp); 1305 } 1306 1307 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, 1308 struct inet6_ifaddr *ift, 1309 bool block) 1310 { 1311 struct inet6_dev *idev = ifp->idev; 1312 struct in6_addr addr, *tmpaddr; 1313 unsigned long tmp_tstamp, age; 1314 unsigned long regen_advance; 1315 struct ifa6_config cfg; 1316 int ret = 0; 1317 unsigned long now = jiffies; 1318 long max_desync_factor; 1319 s32 cnf_temp_preferred_lft; 1320 1321 write_lock_bh(&idev->lock); 1322 if (ift) { 1323 spin_lock_bh(&ift->lock); 1324 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8); 1325 spin_unlock_bh(&ift->lock); 1326 tmpaddr = &addr; 1327 } else { 1328 tmpaddr = NULL; 1329 } 1330 retry: 1331 in6_dev_hold(idev); 1332 if (idev->cnf.use_tempaddr <= 0) { 1333 write_unlock_bh(&idev->lock); 1334 pr_info("%s: use_tempaddr is disabled\n", __func__); 1335 in6_dev_put(idev); 1336 ret = -1; 1337 goto out; 1338 } 1339 spin_lock_bh(&ifp->lock); 1340 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) { 1341 idev->cnf.use_tempaddr = -1; /*XXX*/ 1342 spin_unlock_bh(&ifp->lock); 1343 write_unlock_bh(&idev->lock); 1344 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n", 1345 __func__); 1346 in6_dev_put(idev); 1347 ret = -1; 1348 goto out; 1349 } 1350 in6_ifa_hold(ifp); 1351 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8); 1352 ipv6_try_regen_rndid(idev, tmpaddr); 1353 memcpy(&addr.s6_addr[8], idev->rndid, 8); 1354 age = (now - ifp->tstamp) / HZ; 1355 1356 regen_advance = idev->cnf.regen_max_retry * 1357 idev->cnf.dad_transmits * 1358 NEIGH_VAR(idev->nd_parms, RETRANS_TIME) / HZ; 1359 1360 /* recalculate max_desync_factor each time and update 1361 * idev->desync_factor if it's larger 1362 */ 1363 cnf_temp_preferred_lft = READ_ONCE(idev->cnf.temp_prefered_lft); 1364 max_desync_factor = min_t(__u32, 1365 idev->cnf.max_desync_factor, 1366 cnf_temp_preferred_lft - regen_advance); 1367 1368 if (unlikely(idev->desync_factor > max_desync_factor)) { 1369 if (max_desync_factor > 0) { 1370 get_random_bytes(&idev->desync_factor, 1371 sizeof(idev->desync_factor)); 1372 idev->desync_factor %= max_desync_factor; 1373 } else { 1374 idev->desync_factor = 0; 1375 } 1376 } 1377 1378 memset(&cfg, 0, sizeof(cfg)); 1379 cfg.valid_lft = min_t(__u32, ifp->valid_lft, 1380 idev->cnf.temp_valid_lft + age); 1381 cfg.preferred_lft = cnf_temp_preferred_lft + age - idev->desync_factor; 1382 cfg.preferred_lft = min_t(__u32, ifp->prefered_lft, cfg.preferred_lft); 1383 1384 cfg.plen = ifp->prefix_len; 1385 tmp_tstamp = ifp->tstamp; 1386 spin_unlock_bh(&ifp->lock); 1387 1388 write_unlock_bh(&idev->lock); 1389 1390 /* A temporary address is created only if this calculated Preferred 1391 * Lifetime is greater than REGEN_ADVANCE time units. In particular, 1392 * an implementation must not create a temporary address with a zero 1393 * Preferred Lifetime. 1394 * Use age calculation as in addrconf_verify to avoid unnecessary 1395 * temporary addresses being generated. 1396 */ 1397 age = (now - tmp_tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ; 1398 if (cfg.preferred_lft <= regen_advance + age) { 1399 in6_ifa_put(ifp); 1400 in6_dev_put(idev); 1401 ret = -1; 1402 goto out; 1403 } 1404 1405 cfg.ifa_flags = IFA_F_TEMPORARY; 1406 /* set in addrconf_prefix_rcv() */ 1407 if (ifp->flags & IFA_F_OPTIMISTIC) 1408 cfg.ifa_flags |= IFA_F_OPTIMISTIC; 1409 1410 cfg.pfx = &addr; 1411 cfg.scope = ipv6_addr_scope(cfg.pfx); 1412 1413 ift = ipv6_add_addr(idev, &cfg, block, NULL); 1414 if (IS_ERR(ift)) { 1415 in6_ifa_put(ifp); 1416 in6_dev_put(idev); 1417 pr_info("%s: retry temporary address regeneration\n", __func__); 1418 tmpaddr = &addr; 1419 write_lock_bh(&idev->lock); 1420 goto retry; 1421 } 1422 1423 spin_lock_bh(&ift->lock); 1424 ift->ifpub = ifp; 1425 ift->cstamp = now; 1426 ift->tstamp = tmp_tstamp; 1427 spin_unlock_bh(&ift->lock); 1428 1429 addrconf_dad_start(ift); 1430 in6_ifa_put(ift); 1431 in6_dev_put(idev); 1432 out: 1433 return ret; 1434 } 1435 1436 /* 1437 * Choose an appropriate source address (RFC3484) 1438 */ 1439 enum { 1440 IPV6_SADDR_RULE_INIT = 0, 1441 IPV6_SADDR_RULE_LOCAL, 1442 IPV6_SADDR_RULE_SCOPE, 1443 IPV6_SADDR_RULE_PREFERRED, 1444 #ifdef CONFIG_IPV6_MIP6 1445 IPV6_SADDR_RULE_HOA, 1446 #endif 1447 IPV6_SADDR_RULE_OIF, 1448 IPV6_SADDR_RULE_LABEL, 1449 IPV6_SADDR_RULE_PRIVACY, 1450 IPV6_SADDR_RULE_ORCHID, 1451 IPV6_SADDR_RULE_PREFIX, 1452 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1453 IPV6_SADDR_RULE_NOT_OPTIMISTIC, 1454 #endif 1455 IPV6_SADDR_RULE_MAX 1456 }; 1457 1458 struct ipv6_saddr_score { 1459 int rule; 1460 int addr_type; 1461 struct inet6_ifaddr *ifa; 1462 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX); 1463 int scopedist; 1464 int matchlen; 1465 }; 1466 1467 struct ipv6_saddr_dst { 1468 const struct in6_addr *addr; 1469 int ifindex; 1470 int scope; 1471 int label; 1472 unsigned int prefs; 1473 }; 1474 1475 static inline int ipv6_saddr_preferred(int type) 1476 { 1477 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK)) 1478 return 1; 1479 return 0; 1480 } 1481 1482 static bool ipv6_use_optimistic_addr(struct net *net, 1483 struct inet6_dev *idev) 1484 { 1485 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1486 if (!idev) 1487 return false; 1488 if (!net->ipv6.devconf_all->optimistic_dad && !idev->cnf.optimistic_dad) 1489 return false; 1490 if (!net->ipv6.devconf_all->use_optimistic && !idev->cnf.use_optimistic) 1491 return false; 1492 1493 return true; 1494 #else 1495 return false; 1496 #endif 1497 } 1498 1499 static bool ipv6_allow_optimistic_dad(struct net *net, 1500 struct inet6_dev *idev) 1501 { 1502 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1503 if (!idev) 1504 return false; 1505 if (!net->ipv6.devconf_all->optimistic_dad && !idev->cnf.optimistic_dad) 1506 return false; 1507 1508 return true; 1509 #else 1510 return false; 1511 #endif 1512 } 1513 1514 static int ipv6_get_saddr_eval(struct net *net, 1515 struct ipv6_saddr_score *score, 1516 struct ipv6_saddr_dst *dst, 1517 int i) 1518 { 1519 int ret; 1520 1521 if (i <= score->rule) { 1522 switch (i) { 1523 case IPV6_SADDR_RULE_SCOPE: 1524 ret = score->scopedist; 1525 break; 1526 case IPV6_SADDR_RULE_PREFIX: 1527 ret = score->matchlen; 1528 break; 1529 default: 1530 ret = !!test_bit(i, score->scorebits); 1531 } 1532 goto out; 1533 } 1534 1535 switch (i) { 1536 case IPV6_SADDR_RULE_INIT: 1537 /* Rule 0: remember if hiscore is not ready yet */ 1538 ret = !!score->ifa; 1539 break; 1540 case IPV6_SADDR_RULE_LOCAL: 1541 /* Rule 1: Prefer same address */ 1542 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr); 1543 break; 1544 case IPV6_SADDR_RULE_SCOPE: 1545 /* Rule 2: Prefer appropriate scope 1546 * 1547 * ret 1548 * ^ 1549 * -1 | d 15 1550 * ---+--+-+---> scope 1551 * | 1552 * | d is scope of the destination. 1553 * B-d | \ 1554 * | \ <- smaller scope is better if 1555 * B-15 | \ if scope is enough for destination. 1556 * | ret = B - scope (-1 <= scope >= d <= 15). 1557 * d-C-1 | / 1558 * |/ <- greater is better 1559 * -C / if scope is not enough for destination. 1560 * /| ret = scope - C (-1 <= d < scope <= 15). 1561 * 1562 * d - C - 1 < B -15 (for all -1 <= d <= 15). 1563 * C > d + 14 - B >= 15 + 14 - B = 29 - B. 1564 * Assume B = 0 and we get C > 29. 1565 */ 1566 ret = __ipv6_addr_src_scope(score->addr_type); 1567 if (ret >= dst->scope) 1568 ret = -ret; 1569 else 1570 ret -= 128; /* 30 is enough */ 1571 score->scopedist = ret; 1572 break; 1573 case IPV6_SADDR_RULE_PREFERRED: 1574 { 1575 /* Rule 3: Avoid deprecated and optimistic addresses */ 1576 u8 avoid = IFA_F_DEPRECATED; 1577 1578 if (!ipv6_use_optimistic_addr(net, score->ifa->idev)) 1579 avoid |= IFA_F_OPTIMISTIC; 1580 ret = ipv6_saddr_preferred(score->addr_type) || 1581 !(score->ifa->flags & avoid); 1582 break; 1583 } 1584 #ifdef CONFIG_IPV6_MIP6 1585 case IPV6_SADDR_RULE_HOA: 1586 { 1587 /* Rule 4: Prefer home address */ 1588 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA); 1589 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome; 1590 break; 1591 } 1592 #endif 1593 case IPV6_SADDR_RULE_OIF: 1594 /* Rule 5: Prefer outgoing interface */ 1595 ret = (!dst->ifindex || 1596 dst->ifindex == score->ifa->idev->dev->ifindex); 1597 break; 1598 case IPV6_SADDR_RULE_LABEL: 1599 /* Rule 6: Prefer matching label */ 1600 ret = ipv6_addr_label(net, 1601 &score->ifa->addr, score->addr_type, 1602 score->ifa->idev->dev->ifindex) == dst->label; 1603 break; 1604 case IPV6_SADDR_RULE_PRIVACY: 1605 { 1606 /* Rule 7: Prefer public address 1607 * Note: prefer temporary address if use_tempaddr >= 2 1608 */ 1609 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ? 1610 !!(dst->prefs & IPV6_PREFER_SRC_TMP) : 1611 score->ifa->idev->cnf.use_tempaddr >= 2; 1612 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp; 1613 break; 1614 } 1615 case IPV6_SADDR_RULE_ORCHID: 1616 /* Rule 8-: Prefer ORCHID vs ORCHID or 1617 * non-ORCHID vs non-ORCHID 1618 */ 1619 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^ 1620 ipv6_addr_orchid(dst->addr)); 1621 break; 1622 case IPV6_SADDR_RULE_PREFIX: 1623 /* Rule 8: Use longest matching prefix */ 1624 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr); 1625 if (ret > score->ifa->prefix_len) 1626 ret = score->ifa->prefix_len; 1627 score->matchlen = ret; 1628 break; 1629 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1630 case IPV6_SADDR_RULE_NOT_OPTIMISTIC: 1631 /* Optimistic addresses still have lower precedence than other 1632 * preferred addresses. 1633 */ 1634 ret = !(score->ifa->flags & IFA_F_OPTIMISTIC); 1635 break; 1636 #endif 1637 default: 1638 ret = 0; 1639 } 1640 1641 if (ret) 1642 __set_bit(i, score->scorebits); 1643 score->rule = i; 1644 out: 1645 return ret; 1646 } 1647 1648 static int __ipv6_dev_get_saddr(struct net *net, 1649 struct ipv6_saddr_dst *dst, 1650 struct inet6_dev *idev, 1651 struct ipv6_saddr_score *scores, 1652 int hiscore_idx) 1653 { 1654 struct ipv6_saddr_score *score = &scores[1 - hiscore_idx], *hiscore = &scores[hiscore_idx]; 1655 1656 list_for_each_entry_rcu(score->ifa, &idev->addr_list, if_list) { 1657 int i; 1658 1659 /* 1660 * - Tentative Address (RFC2462 section 5.4) 1661 * - A tentative address is not considered 1662 * "assigned to an interface" in the traditional 1663 * sense, unless it is also flagged as optimistic. 1664 * - Candidate Source Address (section 4) 1665 * - In any case, anycast addresses, multicast 1666 * addresses, and the unspecified address MUST 1667 * NOT be included in a candidate set. 1668 */ 1669 if ((score->ifa->flags & IFA_F_TENTATIVE) && 1670 (!(score->ifa->flags & IFA_F_OPTIMISTIC))) 1671 continue; 1672 1673 score->addr_type = __ipv6_addr_type(&score->ifa->addr); 1674 1675 if (unlikely(score->addr_type == IPV6_ADDR_ANY || 1676 score->addr_type & IPV6_ADDR_MULTICAST)) { 1677 net_dbg_ratelimited("ADDRCONF: unspecified / multicast address assigned as unicast address on %s", 1678 idev->dev->name); 1679 continue; 1680 } 1681 1682 score->rule = -1; 1683 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX); 1684 1685 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) { 1686 int minihiscore, miniscore; 1687 1688 minihiscore = ipv6_get_saddr_eval(net, hiscore, dst, i); 1689 miniscore = ipv6_get_saddr_eval(net, score, dst, i); 1690 1691 if (minihiscore > miniscore) { 1692 if (i == IPV6_SADDR_RULE_SCOPE && 1693 score->scopedist > 0) { 1694 /* 1695 * special case: 1696 * each remaining entry 1697 * has too small (not enough) 1698 * scope, because ifa entries 1699 * are sorted by their scope 1700 * values. 1701 */ 1702 goto out; 1703 } 1704 break; 1705 } else if (minihiscore < miniscore) { 1706 swap(hiscore, score); 1707 hiscore_idx = 1 - hiscore_idx; 1708 1709 /* restore our iterator */ 1710 score->ifa = hiscore->ifa; 1711 1712 break; 1713 } 1714 } 1715 } 1716 out: 1717 return hiscore_idx; 1718 } 1719 1720 static int ipv6_get_saddr_master(struct net *net, 1721 const struct net_device *dst_dev, 1722 const struct net_device *master, 1723 struct ipv6_saddr_dst *dst, 1724 struct ipv6_saddr_score *scores, 1725 int hiscore_idx) 1726 { 1727 struct inet6_dev *idev; 1728 1729 idev = __in6_dev_get(dst_dev); 1730 if (idev) 1731 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev, 1732 scores, hiscore_idx); 1733 1734 idev = __in6_dev_get(master); 1735 if (idev) 1736 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev, 1737 scores, hiscore_idx); 1738 1739 return hiscore_idx; 1740 } 1741 1742 int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev, 1743 const struct in6_addr *daddr, unsigned int prefs, 1744 struct in6_addr *saddr) 1745 { 1746 struct ipv6_saddr_score scores[2], *hiscore; 1747 struct ipv6_saddr_dst dst; 1748 struct inet6_dev *idev; 1749 struct net_device *dev; 1750 int dst_type; 1751 bool use_oif_addr = false; 1752 int hiscore_idx = 0; 1753 int ret = 0; 1754 1755 dst_type = __ipv6_addr_type(daddr); 1756 dst.addr = daddr; 1757 dst.ifindex = dst_dev ? dst_dev->ifindex : 0; 1758 dst.scope = __ipv6_addr_src_scope(dst_type); 1759 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex); 1760 dst.prefs = prefs; 1761 1762 scores[hiscore_idx].rule = -1; 1763 scores[hiscore_idx].ifa = NULL; 1764 1765 rcu_read_lock(); 1766 1767 /* Candidate Source Address (section 4) 1768 * - multicast and link-local destination address, 1769 * the set of candidate source address MUST only 1770 * include addresses assigned to interfaces 1771 * belonging to the same link as the outgoing 1772 * interface. 1773 * (- For site-local destination addresses, the 1774 * set of candidate source addresses MUST only 1775 * include addresses assigned to interfaces 1776 * belonging to the same site as the outgoing 1777 * interface.) 1778 * - "It is RECOMMENDED that the candidate source addresses 1779 * be the set of unicast addresses assigned to the 1780 * interface that will be used to send to the destination 1781 * (the 'outgoing' interface)." (RFC 6724) 1782 */ 1783 if (dst_dev) { 1784 idev = __in6_dev_get(dst_dev); 1785 if ((dst_type & IPV6_ADDR_MULTICAST) || 1786 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL || 1787 (idev && idev->cnf.use_oif_addrs_only)) { 1788 use_oif_addr = true; 1789 } 1790 } 1791 1792 if (use_oif_addr) { 1793 if (idev) 1794 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx); 1795 } else { 1796 const struct net_device *master; 1797 int master_idx = 0; 1798 1799 /* if dst_dev exists and is enslaved to an L3 device, then 1800 * prefer addresses from dst_dev and then the master over 1801 * any other enslaved devices in the L3 domain. 1802 */ 1803 master = l3mdev_master_dev_rcu(dst_dev); 1804 if (master) { 1805 master_idx = master->ifindex; 1806 1807 hiscore_idx = ipv6_get_saddr_master(net, dst_dev, 1808 master, &dst, 1809 scores, hiscore_idx); 1810 1811 if (scores[hiscore_idx].ifa) 1812 goto out; 1813 } 1814 1815 for_each_netdev_rcu(net, dev) { 1816 /* only consider addresses on devices in the 1817 * same L3 domain 1818 */ 1819 if (l3mdev_master_ifindex_rcu(dev) != master_idx) 1820 continue; 1821 idev = __in6_dev_get(dev); 1822 if (!idev) 1823 continue; 1824 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx); 1825 } 1826 } 1827 1828 out: 1829 hiscore = &scores[hiscore_idx]; 1830 if (!hiscore->ifa) 1831 ret = -EADDRNOTAVAIL; 1832 else 1833 *saddr = hiscore->ifa->addr; 1834 1835 rcu_read_unlock(); 1836 return ret; 1837 } 1838 EXPORT_SYMBOL(ipv6_dev_get_saddr); 1839 1840 int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr, 1841 u32 banned_flags) 1842 { 1843 struct inet6_ifaddr *ifp; 1844 int err = -EADDRNOTAVAIL; 1845 1846 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) { 1847 if (ifp->scope > IFA_LINK) 1848 break; 1849 if (ifp->scope == IFA_LINK && 1850 !(ifp->flags & banned_flags)) { 1851 *addr = ifp->addr; 1852 err = 0; 1853 break; 1854 } 1855 } 1856 return err; 1857 } 1858 1859 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr, 1860 u32 banned_flags) 1861 { 1862 struct inet6_dev *idev; 1863 int err = -EADDRNOTAVAIL; 1864 1865 rcu_read_lock(); 1866 idev = __in6_dev_get(dev); 1867 if (idev) { 1868 read_lock_bh(&idev->lock); 1869 err = __ipv6_get_lladdr(idev, addr, banned_flags); 1870 read_unlock_bh(&idev->lock); 1871 } 1872 rcu_read_unlock(); 1873 return err; 1874 } 1875 1876 static int ipv6_count_addresses(const struct inet6_dev *idev) 1877 { 1878 const struct inet6_ifaddr *ifp; 1879 int cnt = 0; 1880 1881 rcu_read_lock(); 1882 list_for_each_entry_rcu(ifp, &idev->addr_list, if_list) 1883 cnt++; 1884 rcu_read_unlock(); 1885 return cnt; 1886 } 1887 1888 int ipv6_chk_addr(struct net *net, const struct in6_addr *addr, 1889 const struct net_device *dev, int strict) 1890 { 1891 return ipv6_chk_addr_and_flags(net, addr, dev, !dev, 1892 strict, IFA_F_TENTATIVE); 1893 } 1894 EXPORT_SYMBOL(ipv6_chk_addr); 1895 1896 /* device argument is used to find the L3 domain of interest. If 1897 * skip_dev_check is set, then the ifp device is not checked against 1898 * the passed in dev argument. So the 2 cases for addresses checks are: 1899 * 1. does the address exist in the L3 domain that dev is part of 1900 * (skip_dev_check = true), or 1901 * 1902 * 2. does the address exist on the specific device 1903 * (skip_dev_check = false) 1904 */ 1905 int ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr, 1906 const struct net_device *dev, bool skip_dev_check, 1907 int strict, u32 banned_flags) 1908 { 1909 unsigned int hash = inet6_addr_hash(net, addr); 1910 const struct net_device *l3mdev; 1911 struct inet6_ifaddr *ifp; 1912 u32 ifp_flags; 1913 1914 rcu_read_lock(); 1915 1916 l3mdev = l3mdev_master_dev_rcu(dev); 1917 if (skip_dev_check) 1918 dev = NULL; 1919 1920 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) { 1921 if (!net_eq(dev_net(ifp->idev->dev), net)) 1922 continue; 1923 1924 if (l3mdev_master_dev_rcu(ifp->idev->dev) != l3mdev) 1925 continue; 1926 1927 /* Decouple optimistic from tentative for evaluation here. 1928 * Ban optimistic addresses explicitly, when required. 1929 */ 1930 ifp_flags = (ifp->flags&IFA_F_OPTIMISTIC) 1931 ? (ifp->flags&~IFA_F_TENTATIVE) 1932 : ifp->flags; 1933 if (ipv6_addr_equal(&ifp->addr, addr) && 1934 !(ifp_flags&banned_flags) && 1935 (!dev || ifp->idev->dev == dev || 1936 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) { 1937 rcu_read_unlock(); 1938 return 1; 1939 } 1940 } 1941 1942 rcu_read_unlock(); 1943 return 0; 1944 } 1945 EXPORT_SYMBOL(ipv6_chk_addr_and_flags); 1946 1947 1948 /* Compares an address/prefix_len with addresses on device @dev. 1949 * If one is found it returns true. 1950 */ 1951 bool ipv6_chk_custom_prefix(const struct in6_addr *addr, 1952 const unsigned int prefix_len, struct net_device *dev) 1953 { 1954 const struct inet6_ifaddr *ifa; 1955 const struct inet6_dev *idev; 1956 bool ret = false; 1957 1958 rcu_read_lock(); 1959 idev = __in6_dev_get(dev); 1960 if (idev) { 1961 list_for_each_entry_rcu(ifa, &idev->addr_list, if_list) { 1962 ret = ipv6_prefix_equal(addr, &ifa->addr, prefix_len); 1963 if (ret) 1964 break; 1965 } 1966 } 1967 rcu_read_unlock(); 1968 1969 return ret; 1970 } 1971 EXPORT_SYMBOL(ipv6_chk_custom_prefix); 1972 1973 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev) 1974 { 1975 const struct inet6_ifaddr *ifa; 1976 const struct inet6_dev *idev; 1977 int onlink; 1978 1979 onlink = 0; 1980 rcu_read_lock(); 1981 idev = __in6_dev_get(dev); 1982 if (idev) { 1983 list_for_each_entry_rcu(ifa, &idev->addr_list, if_list) { 1984 onlink = ipv6_prefix_equal(addr, &ifa->addr, 1985 ifa->prefix_len); 1986 if (onlink) 1987 break; 1988 } 1989 } 1990 rcu_read_unlock(); 1991 return onlink; 1992 } 1993 EXPORT_SYMBOL(ipv6_chk_prefix); 1994 1995 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr, 1996 struct net_device *dev, int strict) 1997 { 1998 unsigned int hash = inet6_addr_hash(net, addr); 1999 struct inet6_ifaddr *ifp, *result = NULL; 2000 2001 rcu_read_lock(); 2002 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) { 2003 if (!net_eq(dev_net(ifp->idev->dev), net)) 2004 continue; 2005 if (ipv6_addr_equal(&ifp->addr, addr)) { 2006 if (!dev || ifp->idev->dev == dev || 2007 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) { 2008 result = ifp; 2009 in6_ifa_hold(ifp); 2010 break; 2011 } 2012 } 2013 } 2014 rcu_read_unlock(); 2015 2016 return result; 2017 } 2018 2019 /* Gets referenced address, destroys ifaddr */ 2020 2021 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed) 2022 { 2023 if (dad_failed) 2024 ifp->flags |= IFA_F_DADFAILED; 2025 2026 if (ifp->flags&IFA_F_TEMPORARY) { 2027 struct inet6_ifaddr *ifpub; 2028 spin_lock_bh(&ifp->lock); 2029 ifpub = ifp->ifpub; 2030 if (ifpub) { 2031 in6_ifa_hold(ifpub); 2032 spin_unlock_bh(&ifp->lock); 2033 ipv6_create_tempaddr(ifpub, ifp, true); 2034 in6_ifa_put(ifpub); 2035 } else { 2036 spin_unlock_bh(&ifp->lock); 2037 } 2038 ipv6_del_addr(ifp); 2039 } else if (ifp->flags&IFA_F_PERMANENT || !dad_failed) { 2040 spin_lock_bh(&ifp->lock); 2041 addrconf_del_dad_work(ifp); 2042 ifp->flags |= IFA_F_TENTATIVE; 2043 if (dad_failed) 2044 ifp->flags &= ~IFA_F_OPTIMISTIC; 2045 spin_unlock_bh(&ifp->lock); 2046 if (dad_failed) 2047 ipv6_ifa_notify(0, ifp); 2048 in6_ifa_put(ifp); 2049 } else { 2050 ipv6_del_addr(ifp); 2051 } 2052 } 2053 2054 static int addrconf_dad_end(struct inet6_ifaddr *ifp) 2055 { 2056 int err = -ENOENT; 2057 2058 spin_lock_bh(&ifp->lock); 2059 if (ifp->state == INET6_IFADDR_STATE_DAD) { 2060 ifp->state = INET6_IFADDR_STATE_POSTDAD; 2061 err = 0; 2062 } 2063 spin_unlock_bh(&ifp->lock); 2064 2065 return err; 2066 } 2067 2068 void addrconf_dad_failure(struct sk_buff *skb, struct inet6_ifaddr *ifp) 2069 { 2070 struct inet6_dev *idev = ifp->idev; 2071 struct net *net = dev_net(ifp->idev->dev); 2072 2073 if (addrconf_dad_end(ifp)) { 2074 in6_ifa_put(ifp); 2075 return; 2076 } 2077 2078 net_info_ratelimited("%s: IPv6 duplicate address %pI6c used by %pM detected!\n", 2079 ifp->idev->dev->name, &ifp->addr, eth_hdr(skb)->h_source); 2080 2081 spin_lock_bh(&ifp->lock); 2082 2083 if (ifp->flags & IFA_F_STABLE_PRIVACY) { 2084 struct in6_addr new_addr; 2085 struct inet6_ifaddr *ifp2; 2086 int retries = ifp->stable_privacy_retry + 1; 2087 struct ifa6_config cfg = { 2088 .pfx = &new_addr, 2089 .plen = ifp->prefix_len, 2090 .ifa_flags = ifp->flags, 2091 .valid_lft = ifp->valid_lft, 2092 .preferred_lft = ifp->prefered_lft, 2093 .scope = ifp->scope, 2094 }; 2095 2096 if (retries > net->ipv6.sysctl.idgen_retries) { 2097 net_info_ratelimited("%s: privacy stable address generation failed because of DAD conflicts!\n", 2098 ifp->idev->dev->name); 2099 goto errdad; 2100 } 2101 2102 new_addr = ifp->addr; 2103 if (ipv6_generate_stable_address(&new_addr, retries, 2104 idev)) 2105 goto errdad; 2106 2107 spin_unlock_bh(&ifp->lock); 2108 2109 if (idev->cnf.max_addresses && 2110 ipv6_count_addresses(idev) >= 2111 idev->cnf.max_addresses) 2112 goto lock_errdad; 2113 2114 net_info_ratelimited("%s: generating new stable privacy address because of DAD conflict\n", 2115 ifp->idev->dev->name); 2116 2117 ifp2 = ipv6_add_addr(idev, &cfg, false, NULL); 2118 if (IS_ERR(ifp2)) 2119 goto lock_errdad; 2120 2121 spin_lock_bh(&ifp2->lock); 2122 ifp2->stable_privacy_retry = retries; 2123 ifp2->state = INET6_IFADDR_STATE_PREDAD; 2124 spin_unlock_bh(&ifp2->lock); 2125 2126 addrconf_mod_dad_work(ifp2, net->ipv6.sysctl.idgen_delay); 2127 in6_ifa_put(ifp2); 2128 lock_errdad: 2129 spin_lock_bh(&ifp->lock); 2130 } 2131 2132 errdad: 2133 /* transition from _POSTDAD to _ERRDAD */ 2134 ifp->state = INET6_IFADDR_STATE_ERRDAD; 2135 spin_unlock_bh(&ifp->lock); 2136 2137 addrconf_mod_dad_work(ifp, 0); 2138 in6_ifa_put(ifp); 2139 } 2140 2141 /* Join to solicited addr multicast group. 2142 * caller must hold RTNL */ 2143 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr) 2144 { 2145 struct in6_addr maddr; 2146 2147 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP)) 2148 return; 2149 2150 addrconf_addr_solict_mult(addr, &maddr); 2151 ipv6_dev_mc_inc(dev, &maddr); 2152 } 2153 2154 /* caller must hold RTNL */ 2155 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr) 2156 { 2157 struct in6_addr maddr; 2158 2159 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP)) 2160 return; 2161 2162 addrconf_addr_solict_mult(addr, &maddr); 2163 __ipv6_dev_mc_dec(idev, &maddr); 2164 } 2165 2166 /* caller must hold RTNL */ 2167 static void addrconf_join_anycast(struct inet6_ifaddr *ifp) 2168 { 2169 struct in6_addr addr; 2170 2171 if (ifp->prefix_len >= 127) /* RFC 6164 */ 2172 return; 2173 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len); 2174 if (ipv6_addr_any(&addr)) 2175 return; 2176 __ipv6_dev_ac_inc(ifp->idev, &addr); 2177 } 2178 2179 /* caller must hold RTNL */ 2180 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp) 2181 { 2182 struct in6_addr addr; 2183 2184 if (ifp->prefix_len >= 127) /* RFC 6164 */ 2185 return; 2186 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len); 2187 if (ipv6_addr_any(&addr)) 2188 return; 2189 __ipv6_dev_ac_dec(ifp->idev, &addr); 2190 } 2191 2192 static int addrconf_ifid_6lowpan(u8 *eui, struct net_device *dev) 2193 { 2194 switch (dev->addr_len) { 2195 case ETH_ALEN: 2196 memcpy(eui, dev->dev_addr, 3); 2197 eui[3] = 0xFF; 2198 eui[4] = 0xFE; 2199 memcpy(eui + 5, dev->dev_addr + 3, 3); 2200 break; 2201 case EUI64_ADDR_LEN: 2202 memcpy(eui, dev->dev_addr, EUI64_ADDR_LEN); 2203 eui[0] ^= 2; 2204 break; 2205 default: 2206 return -1; 2207 } 2208 2209 return 0; 2210 } 2211 2212 static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev) 2213 { 2214 union fwnet_hwaddr *ha; 2215 2216 if (dev->addr_len != FWNET_ALEN) 2217 return -1; 2218 2219 ha = (union fwnet_hwaddr *)dev->dev_addr; 2220 2221 memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id)); 2222 eui[0] ^= 2; 2223 return 0; 2224 } 2225 2226 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev) 2227 { 2228 /* XXX: inherit EUI-64 from other interface -- yoshfuji */ 2229 if (dev->addr_len != ARCNET_ALEN) 2230 return -1; 2231 memset(eui, 0, 7); 2232 eui[7] = *(u8 *)dev->dev_addr; 2233 return 0; 2234 } 2235 2236 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev) 2237 { 2238 if (dev->addr_len != INFINIBAND_ALEN) 2239 return -1; 2240 memcpy(eui, dev->dev_addr + 12, 8); 2241 eui[0] |= 2; 2242 return 0; 2243 } 2244 2245 static int __ipv6_isatap_ifid(u8 *eui, __be32 addr) 2246 { 2247 if (addr == 0) 2248 return -1; 2249 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) || 2250 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) || 2251 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) || 2252 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) || 2253 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) || 2254 ipv4_is_lbcast(addr)) ? 0x00 : 0x02; 2255 eui[1] = 0; 2256 eui[2] = 0x5E; 2257 eui[3] = 0xFE; 2258 memcpy(eui + 4, &addr, 4); 2259 return 0; 2260 } 2261 2262 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev) 2263 { 2264 if (dev->priv_flags & IFF_ISATAP) 2265 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr); 2266 return -1; 2267 } 2268 2269 static int addrconf_ifid_gre(u8 *eui, struct net_device *dev) 2270 { 2271 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr); 2272 } 2273 2274 static int addrconf_ifid_ip6tnl(u8 *eui, struct net_device *dev) 2275 { 2276 memcpy(eui, dev->perm_addr, 3); 2277 memcpy(eui + 5, dev->perm_addr + 3, 3); 2278 eui[3] = 0xFF; 2279 eui[4] = 0xFE; 2280 eui[0] ^= 2; 2281 return 0; 2282 } 2283 2284 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev) 2285 { 2286 switch (dev->type) { 2287 case ARPHRD_ETHER: 2288 case ARPHRD_FDDI: 2289 return addrconf_ifid_eui48(eui, dev); 2290 case ARPHRD_ARCNET: 2291 return addrconf_ifid_arcnet(eui, dev); 2292 case ARPHRD_INFINIBAND: 2293 return addrconf_ifid_infiniband(eui, dev); 2294 case ARPHRD_SIT: 2295 return addrconf_ifid_sit(eui, dev); 2296 case ARPHRD_IPGRE: 2297 case ARPHRD_TUNNEL: 2298 return addrconf_ifid_gre(eui, dev); 2299 case ARPHRD_6LOWPAN: 2300 return addrconf_ifid_6lowpan(eui, dev); 2301 case ARPHRD_IEEE1394: 2302 return addrconf_ifid_ieee1394(eui, dev); 2303 case ARPHRD_TUNNEL6: 2304 case ARPHRD_IP6GRE: 2305 case ARPHRD_RAWIP: 2306 return addrconf_ifid_ip6tnl(eui, dev); 2307 } 2308 return -1; 2309 } 2310 2311 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev) 2312 { 2313 int err = -1; 2314 struct inet6_ifaddr *ifp; 2315 2316 read_lock_bh(&idev->lock); 2317 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) { 2318 if (ifp->scope > IFA_LINK) 2319 break; 2320 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) { 2321 memcpy(eui, ifp->addr.s6_addr+8, 8); 2322 err = 0; 2323 break; 2324 } 2325 } 2326 read_unlock_bh(&idev->lock); 2327 return err; 2328 } 2329 2330 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */ 2331 static void ipv6_regen_rndid(struct inet6_dev *idev) 2332 { 2333 regen: 2334 get_random_bytes(idev->rndid, sizeof(idev->rndid)); 2335 idev->rndid[0] &= ~0x02; 2336 2337 /* 2338 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>: 2339 * check if generated address is not inappropriate 2340 * 2341 * - Reserved subnet anycast (RFC 2526) 2342 * 11111101 11....11 1xxxxxxx 2343 * - ISATAP (RFC4214) 6.1 2344 * 00-00-5E-FE-xx-xx-xx-xx 2345 * - value 0 2346 * - XXX: already assigned to an address on the device 2347 */ 2348 if (idev->rndid[0] == 0xfd && 2349 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff && 2350 (idev->rndid[7]&0x80)) 2351 goto regen; 2352 if ((idev->rndid[0]|idev->rndid[1]) == 0) { 2353 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe) 2354 goto regen; 2355 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00) 2356 goto regen; 2357 } 2358 } 2359 2360 static void ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) 2361 { 2362 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0) 2363 ipv6_regen_rndid(idev); 2364 } 2365 2366 /* 2367 * Add prefix route. 2368 */ 2369 2370 static void 2371 addrconf_prefix_route(struct in6_addr *pfx, int plen, u32 metric, 2372 struct net_device *dev, unsigned long expires, 2373 u32 flags, gfp_t gfp_flags) 2374 { 2375 struct fib6_config cfg = { 2376 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX, 2377 .fc_metric = metric ? : IP6_RT_PRIO_ADDRCONF, 2378 .fc_ifindex = dev->ifindex, 2379 .fc_expires = expires, 2380 .fc_dst_len = plen, 2381 .fc_flags = RTF_UP | flags, 2382 .fc_nlinfo.nl_net = dev_net(dev), 2383 .fc_protocol = RTPROT_KERNEL, 2384 .fc_type = RTN_UNICAST, 2385 }; 2386 2387 cfg.fc_dst = *pfx; 2388 2389 /* Prevent useless cloning on PtP SIT. 2390 This thing is done here expecting that the whole 2391 class of non-broadcast devices need not cloning. 2392 */ 2393 #if IS_ENABLED(CONFIG_IPV6_SIT) 2394 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT)) 2395 cfg.fc_flags |= RTF_NONEXTHOP; 2396 #endif 2397 2398 ip6_route_add(&cfg, gfp_flags, NULL); 2399 } 2400 2401 2402 static struct fib6_info *addrconf_get_prefix_route(const struct in6_addr *pfx, 2403 int plen, 2404 const struct net_device *dev, 2405 u32 flags, u32 noflags, 2406 bool no_gw) 2407 { 2408 struct fib6_node *fn; 2409 struct fib6_info *rt = NULL; 2410 struct fib6_table *table; 2411 u32 tb_id = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX; 2412 2413 table = fib6_get_table(dev_net(dev), tb_id); 2414 if (!table) 2415 return NULL; 2416 2417 rcu_read_lock(); 2418 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0, true); 2419 if (!fn) 2420 goto out; 2421 2422 for_each_fib6_node_rt_rcu(fn) { 2423 /* prefix routes only use builtin fib6_nh */ 2424 if (rt->nh) 2425 continue; 2426 2427 if (rt->fib6_nh->fib_nh_dev->ifindex != dev->ifindex) 2428 continue; 2429 if (no_gw && rt->fib6_nh->fib_nh_gw_family) 2430 continue; 2431 if ((rt->fib6_flags & flags) != flags) 2432 continue; 2433 if ((rt->fib6_flags & noflags) != 0) 2434 continue; 2435 if (!fib6_info_hold_safe(rt)) 2436 continue; 2437 break; 2438 } 2439 out: 2440 rcu_read_unlock(); 2441 return rt; 2442 } 2443 2444 2445 /* Create "default" multicast route to the interface */ 2446 2447 static void addrconf_add_mroute(struct net_device *dev) 2448 { 2449 struct fib6_config cfg = { 2450 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_LOCAL, 2451 .fc_metric = IP6_RT_PRIO_ADDRCONF, 2452 .fc_ifindex = dev->ifindex, 2453 .fc_dst_len = 8, 2454 .fc_flags = RTF_UP, 2455 .fc_type = RTN_UNICAST, 2456 .fc_nlinfo.nl_net = dev_net(dev), 2457 }; 2458 2459 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0); 2460 2461 ip6_route_add(&cfg, GFP_KERNEL, NULL); 2462 } 2463 2464 static struct inet6_dev *addrconf_add_dev(struct net_device *dev) 2465 { 2466 struct inet6_dev *idev; 2467 2468 ASSERT_RTNL(); 2469 2470 idev = ipv6_find_idev(dev); 2471 if (IS_ERR(idev)) 2472 return idev; 2473 2474 if (idev->cnf.disable_ipv6) 2475 return ERR_PTR(-EACCES); 2476 2477 /* Add default multicast route */ 2478 if (!(dev->flags & IFF_LOOPBACK) && !netif_is_l3_master(dev)) 2479 addrconf_add_mroute(dev); 2480 2481 return idev; 2482 } 2483 2484 static void manage_tempaddrs(struct inet6_dev *idev, 2485 struct inet6_ifaddr *ifp, 2486 __u32 valid_lft, __u32 prefered_lft, 2487 bool create, unsigned long now) 2488 { 2489 u32 flags; 2490 struct inet6_ifaddr *ift; 2491 2492 read_lock_bh(&idev->lock); 2493 /* update all temporary addresses in the list */ 2494 list_for_each_entry(ift, &idev->tempaddr_list, tmp_list) { 2495 int age, max_valid, max_prefered; 2496 2497 if (ifp != ift->ifpub) 2498 continue; 2499 2500 /* RFC 4941 section 3.3: 2501 * If a received option will extend the lifetime of a public 2502 * address, the lifetimes of temporary addresses should 2503 * be extended, subject to the overall constraint that no 2504 * temporary addresses should ever remain "valid" or "preferred" 2505 * for a time longer than (TEMP_VALID_LIFETIME) or 2506 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), respectively. 2507 */ 2508 age = (now - ift->cstamp) / HZ; 2509 max_valid = idev->cnf.temp_valid_lft - age; 2510 if (max_valid < 0) 2511 max_valid = 0; 2512 2513 max_prefered = idev->cnf.temp_prefered_lft - 2514 idev->desync_factor - age; 2515 if (max_prefered < 0) 2516 max_prefered = 0; 2517 2518 if (valid_lft > max_valid) 2519 valid_lft = max_valid; 2520 2521 if (prefered_lft > max_prefered) 2522 prefered_lft = max_prefered; 2523 2524 spin_lock(&ift->lock); 2525 flags = ift->flags; 2526 ift->valid_lft = valid_lft; 2527 ift->prefered_lft = prefered_lft; 2528 ift->tstamp = now; 2529 if (prefered_lft > 0) 2530 ift->flags &= ~IFA_F_DEPRECATED; 2531 2532 spin_unlock(&ift->lock); 2533 if (!(flags&IFA_F_TENTATIVE)) 2534 ipv6_ifa_notify(0, ift); 2535 } 2536 2537 if ((create || list_empty(&idev->tempaddr_list)) && 2538 idev->cnf.use_tempaddr > 0) { 2539 /* When a new public address is created as described 2540 * in [ADDRCONF], also create a new temporary address. 2541 * Also create a temporary address if it's enabled but 2542 * no temporary address currently exists. 2543 */ 2544 read_unlock_bh(&idev->lock); 2545 ipv6_create_tempaddr(ifp, NULL, false); 2546 } else { 2547 read_unlock_bh(&idev->lock); 2548 } 2549 } 2550 2551 static bool is_addr_mode_generate_stable(struct inet6_dev *idev) 2552 { 2553 return idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY || 2554 idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_RANDOM; 2555 } 2556 2557 int addrconf_prefix_rcv_add_addr(struct net *net, struct net_device *dev, 2558 const struct prefix_info *pinfo, 2559 struct inet6_dev *in6_dev, 2560 const struct in6_addr *addr, int addr_type, 2561 u32 addr_flags, bool sllao, bool tokenized, 2562 __u32 valid_lft, u32 prefered_lft) 2563 { 2564 struct inet6_ifaddr *ifp = ipv6_get_ifaddr(net, addr, dev, 1); 2565 int create = 0, update_lft = 0; 2566 2567 if (!ifp && valid_lft) { 2568 int max_addresses = in6_dev->cnf.max_addresses; 2569 struct ifa6_config cfg = { 2570 .pfx = addr, 2571 .plen = pinfo->prefix_len, 2572 .ifa_flags = addr_flags, 2573 .valid_lft = valid_lft, 2574 .preferred_lft = prefered_lft, 2575 .scope = addr_type & IPV6_ADDR_SCOPE_MASK, 2576 }; 2577 2578 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 2579 if ((net->ipv6.devconf_all->optimistic_dad || 2580 in6_dev->cnf.optimistic_dad) && 2581 !net->ipv6.devconf_all->forwarding && sllao) 2582 cfg.ifa_flags |= IFA_F_OPTIMISTIC; 2583 #endif 2584 2585 /* Do not allow to create too much of autoconfigured 2586 * addresses; this would be too easy way to crash kernel. 2587 */ 2588 if (!max_addresses || 2589 ipv6_count_addresses(in6_dev) < max_addresses) 2590 ifp = ipv6_add_addr(in6_dev, &cfg, false, NULL); 2591 2592 if (IS_ERR_OR_NULL(ifp)) 2593 return -1; 2594 2595 create = 1; 2596 spin_lock_bh(&ifp->lock); 2597 ifp->flags |= IFA_F_MANAGETEMPADDR; 2598 ifp->cstamp = jiffies; 2599 ifp->tokenized = tokenized; 2600 spin_unlock_bh(&ifp->lock); 2601 addrconf_dad_start(ifp); 2602 } 2603 2604 if (ifp) { 2605 u32 flags; 2606 unsigned long now; 2607 u32 stored_lft; 2608 2609 /* update lifetime (RFC2462 5.5.3 e) */ 2610 spin_lock_bh(&ifp->lock); 2611 now = jiffies; 2612 if (ifp->valid_lft > (now - ifp->tstamp) / HZ) 2613 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ; 2614 else 2615 stored_lft = 0; 2616 if (!create && stored_lft) { 2617 const u32 minimum_lft = min_t(u32, 2618 stored_lft, MIN_VALID_LIFETIME); 2619 valid_lft = max(valid_lft, minimum_lft); 2620 2621 /* RFC4862 Section 5.5.3e: 2622 * "Note that the preferred lifetime of the 2623 * corresponding address is always reset to 2624 * the Preferred Lifetime in the received 2625 * Prefix Information option, regardless of 2626 * whether the valid lifetime is also reset or 2627 * ignored." 2628 * 2629 * So we should always update prefered_lft here. 2630 */ 2631 update_lft = 1; 2632 } 2633 2634 if (update_lft) { 2635 ifp->valid_lft = valid_lft; 2636 ifp->prefered_lft = prefered_lft; 2637 ifp->tstamp = now; 2638 flags = ifp->flags; 2639 ifp->flags &= ~IFA_F_DEPRECATED; 2640 spin_unlock_bh(&ifp->lock); 2641 2642 if (!(flags&IFA_F_TENTATIVE)) 2643 ipv6_ifa_notify(0, ifp); 2644 } else 2645 spin_unlock_bh(&ifp->lock); 2646 2647 manage_tempaddrs(in6_dev, ifp, valid_lft, prefered_lft, 2648 create, now); 2649 2650 in6_ifa_put(ifp); 2651 addrconf_verify(); 2652 } 2653 2654 return 0; 2655 } 2656 EXPORT_SYMBOL_GPL(addrconf_prefix_rcv_add_addr); 2657 2658 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao) 2659 { 2660 struct prefix_info *pinfo; 2661 __u32 valid_lft; 2662 __u32 prefered_lft; 2663 int addr_type, err; 2664 u32 addr_flags = 0; 2665 struct inet6_dev *in6_dev; 2666 struct net *net = dev_net(dev); 2667 2668 pinfo = (struct prefix_info *) opt; 2669 2670 if (len < sizeof(struct prefix_info)) { 2671 netdev_dbg(dev, "addrconf: prefix option too short\n"); 2672 return; 2673 } 2674 2675 /* 2676 * Validation checks ([ADDRCONF], page 19) 2677 */ 2678 2679 addr_type = ipv6_addr_type(&pinfo->prefix); 2680 2681 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL)) 2682 return; 2683 2684 valid_lft = ntohl(pinfo->valid); 2685 prefered_lft = ntohl(pinfo->prefered); 2686 2687 if (prefered_lft > valid_lft) { 2688 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n"); 2689 return; 2690 } 2691 2692 in6_dev = in6_dev_get(dev); 2693 2694 if (!in6_dev) { 2695 net_dbg_ratelimited("addrconf: device %s not configured\n", 2696 dev->name); 2697 return; 2698 } 2699 2700 /* 2701 * Two things going on here: 2702 * 1) Add routes for on-link prefixes 2703 * 2) Configure prefixes with the auto flag set 2704 */ 2705 2706 if (pinfo->onlink) { 2707 struct fib6_info *rt; 2708 unsigned long rt_expires; 2709 2710 /* Avoid arithmetic overflow. Really, we could 2711 * save rt_expires in seconds, likely valid_lft, 2712 * but it would require division in fib gc, that it 2713 * not good. 2714 */ 2715 if (HZ > USER_HZ) 2716 rt_expires = addrconf_timeout_fixup(valid_lft, HZ); 2717 else 2718 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ); 2719 2720 if (addrconf_finite_timeout(rt_expires)) 2721 rt_expires *= HZ; 2722 2723 rt = addrconf_get_prefix_route(&pinfo->prefix, 2724 pinfo->prefix_len, 2725 dev, 2726 RTF_ADDRCONF | RTF_PREFIX_RT, 2727 RTF_DEFAULT, true); 2728 2729 if (rt) { 2730 /* Autoconf prefix route */ 2731 if (valid_lft == 0) { 2732 ip6_del_rt(net, rt); 2733 rt = NULL; 2734 } else if (addrconf_finite_timeout(rt_expires)) { 2735 /* not infinity */ 2736 fib6_set_expires(rt, jiffies + rt_expires); 2737 } else { 2738 fib6_clean_expires(rt); 2739 } 2740 } else if (valid_lft) { 2741 clock_t expires = 0; 2742 int flags = RTF_ADDRCONF | RTF_PREFIX_RT; 2743 if (addrconf_finite_timeout(rt_expires)) { 2744 /* not infinity */ 2745 flags |= RTF_EXPIRES; 2746 expires = jiffies_to_clock_t(rt_expires); 2747 } 2748 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len, 2749 0, dev, expires, flags, 2750 GFP_ATOMIC); 2751 } 2752 fib6_info_release(rt); 2753 } 2754 2755 /* Try to figure out our local address for this prefix */ 2756 2757 if (pinfo->autoconf && in6_dev->cnf.autoconf) { 2758 struct in6_addr addr; 2759 bool tokenized = false, dev_addr_generated = false; 2760 2761 if (pinfo->prefix_len == 64) { 2762 memcpy(&addr, &pinfo->prefix, 8); 2763 2764 if (!ipv6_addr_any(&in6_dev->token)) { 2765 read_lock_bh(&in6_dev->lock); 2766 memcpy(addr.s6_addr + 8, 2767 in6_dev->token.s6_addr + 8, 8); 2768 read_unlock_bh(&in6_dev->lock); 2769 tokenized = true; 2770 } else if (is_addr_mode_generate_stable(in6_dev) && 2771 !ipv6_generate_stable_address(&addr, 0, 2772 in6_dev)) { 2773 addr_flags |= IFA_F_STABLE_PRIVACY; 2774 goto ok; 2775 } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) && 2776 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) { 2777 goto put; 2778 } else { 2779 dev_addr_generated = true; 2780 } 2781 goto ok; 2782 } 2783 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n", 2784 pinfo->prefix_len); 2785 goto put; 2786 2787 ok: 2788 err = addrconf_prefix_rcv_add_addr(net, dev, pinfo, in6_dev, 2789 &addr, addr_type, 2790 addr_flags, sllao, 2791 tokenized, valid_lft, 2792 prefered_lft); 2793 if (err) 2794 goto put; 2795 2796 /* Ignore error case here because previous prefix add addr was 2797 * successful which will be notified. 2798 */ 2799 ndisc_ops_prefix_rcv_add_addr(net, dev, pinfo, in6_dev, &addr, 2800 addr_type, addr_flags, sllao, 2801 tokenized, valid_lft, 2802 prefered_lft, 2803 dev_addr_generated); 2804 } 2805 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo); 2806 put: 2807 in6_dev_put(in6_dev); 2808 } 2809 2810 /* 2811 * Set destination address. 2812 * Special case for SIT interfaces where we create a new "virtual" 2813 * device. 2814 */ 2815 int addrconf_set_dstaddr(struct net *net, void __user *arg) 2816 { 2817 struct in6_ifreq ireq; 2818 struct net_device *dev; 2819 int err = -EINVAL; 2820 2821 rtnl_lock(); 2822 2823 err = -EFAULT; 2824 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2825 goto err_exit; 2826 2827 dev = __dev_get_by_index(net, ireq.ifr6_ifindex); 2828 2829 err = -ENODEV; 2830 if (!dev) 2831 goto err_exit; 2832 2833 #if IS_ENABLED(CONFIG_IPV6_SIT) 2834 if (dev->type == ARPHRD_SIT) { 2835 const struct net_device_ops *ops = dev->netdev_ops; 2836 struct ifreq ifr; 2837 struct ip_tunnel_parm p; 2838 2839 err = -EADDRNOTAVAIL; 2840 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4)) 2841 goto err_exit; 2842 2843 memset(&p, 0, sizeof(p)); 2844 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3]; 2845 p.iph.saddr = 0; 2846 p.iph.version = 4; 2847 p.iph.ihl = 5; 2848 p.iph.protocol = IPPROTO_IPV6; 2849 p.iph.ttl = 64; 2850 ifr.ifr_ifru.ifru_data = (__force void __user *)&p; 2851 2852 if (ops->ndo_do_ioctl) { 2853 mm_segment_t oldfs = get_fs(); 2854 2855 set_fs(KERNEL_DS); 2856 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL); 2857 set_fs(oldfs); 2858 } else 2859 err = -EOPNOTSUPP; 2860 2861 if (err == 0) { 2862 err = -ENOBUFS; 2863 dev = __dev_get_by_name(net, p.name); 2864 if (!dev) 2865 goto err_exit; 2866 err = dev_open(dev, NULL); 2867 } 2868 } 2869 #endif 2870 2871 err_exit: 2872 rtnl_unlock(); 2873 return err; 2874 } 2875 2876 static int ipv6_mc_config(struct sock *sk, bool join, 2877 const struct in6_addr *addr, int ifindex) 2878 { 2879 int ret; 2880 2881 ASSERT_RTNL(); 2882 2883 lock_sock(sk); 2884 if (join) 2885 ret = ipv6_sock_mc_join(sk, ifindex, addr); 2886 else 2887 ret = ipv6_sock_mc_drop(sk, ifindex, addr); 2888 release_sock(sk); 2889 2890 return ret; 2891 } 2892 2893 /* 2894 * Manual configuration of address on an interface 2895 */ 2896 static int inet6_addr_add(struct net *net, int ifindex, 2897 struct ifa6_config *cfg, 2898 struct netlink_ext_ack *extack) 2899 { 2900 struct inet6_ifaddr *ifp; 2901 struct inet6_dev *idev; 2902 struct net_device *dev; 2903 unsigned long timeout; 2904 clock_t expires; 2905 u32 flags; 2906 2907 ASSERT_RTNL(); 2908 2909 if (cfg->plen > 128) 2910 return -EINVAL; 2911 2912 /* check the lifetime */ 2913 if (!cfg->valid_lft || cfg->preferred_lft > cfg->valid_lft) 2914 return -EINVAL; 2915 2916 if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR && cfg->plen != 64) 2917 return -EINVAL; 2918 2919 dev = __dev_get_by_index(net, ifindex); 2920 if (!dev) 2921 return -ENODEV; 2922 2923 idev = addrconf_add_dev(dev); 2924 if (IS_ERR(idev)) 2925 return PTR_ERR(idev); 2926 2927 if (cfg->ifa_flags & IFA_F_MCAUTOJOIN) { 2928 int ret = ipv6_mc_config(net->ipv6.mc_autojoin_sk, 2929 true, cfg->pfx, ifindex); 2930 2931 if (ret < 0) 2932 return ret; 2933 } 2934 2935 cfg->scope = ipv6_addr_scope(cfg->pfx); 2936 2937 timeout = addrconf_timeout_fixup(cfg->valid_lft, HZ); 2938 if (addrconf_finite_timeout(timeout)) { 2939 expires = jiffies_to_clock_t(timeout * HZ); 2940 cfg->valid_lft = timeout; 2941 flags = RTF_EXPIRES; 2942 } else { 2943 expires = 0; 2944 flags = 0; 2945 cfg->ifa_flags |= IFA_F_PERMANENT; 2946 } 2947 2948 timeout = addrconf_timeout_fixup(cfg->preferred_lft, HZ); 2949 if (addrconf_finite_timeout(timeout)) { 2950 if (timeout == 0) 2951 cfg->ifa_flags |= IFA_F_DEPRECATED; 2952 cfg->preferred_lft = timeout; 2953 } 2954 2955 ifp = ipv6_add_addr(idev, cfg, true, extack); 2956 if (!IS_ERR(ifp)) { 2957 if (!(cfg->ifa_flags & IFA_F_NOPREFIXROUTE)) { 2958 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, 2959 ifp->rt_priority, dev, expires, 2960 flags, GFP_KERNEL); 2961 } 2962 2963 /* Send a netlink notification if DAD is enabled and 2964 * optimistic flag is not set 2965 */ 2966 if (!(ifp->flags & (IFA_F_OPTIMISTIC | IFA_F_NODAD))) 2967 ipv6_ifa_notify(0, ifp); 2968 /* 2969 * Note that section 3.1 of RFC 4429 indicates 2970 * that the Optimistic flag should not be set for 2971 * manually configured addresses 2972 */ 2973 addrconf_dad_start(ifp); 2974 if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR) 2975 manage_tempaddrs(idev, ifp, cfg->valid_lft, 2976 cfg->preferred_lft, true, jiffies); 2977 in6_ifa_put(ifp); 2978 addrconf_verify_rtnl(); 2979 return 0; 2980 } else if (cfg->ifa_flags & IFA_F_MCAUTOJOIN) { 2981 ipv6_mc_config(net->ipv6.mc_autojoin_sk, false, 2982 cfg->pfx, ifindex); 2983 } 2984 2985 return PTR_ERR(ifp); 2986 } 2987 2988 static int inet6_addr_del(struct net *net, int ifindex, u32 ifa_flags, 2989 const struct in6_addr *pfx, unsigned int plen) 2990 { 2991 struct inet6_ifaddr *ifp; 2992 struct inet6_dev *idev; 2993 struct net_device *dev; 2994 2995 if (plen > 128) 2996 return -EINVAL; 2997 2998 dev = __dev_get_by_index(net, ifindex); 2999 if (!dev) 3000 return -ENODEV; 3001 3002 idev = __in6_dev_get(dev); 3003 if (!idev) 3004 return -ENXIO; 3005 3006 read_lock_bh(&idev->lock); 3007 list_for_each_entry(ifp, &idev->addr_list, if_list) { 3008 if (ifp->prefix_len == plen && 3009 ipv6_addr_equal(pfx, &ifp->addr)) { 3010 in6_ifa_hold(ifp); 3011 read_unlock_bh(&idev->lock); 3012 3013 if (!(ifp->flags & IFA_F_TEMPORARY) && 3014 (ifa_flags & IFA_F_MANAGETEMPADDR)) 3015 manage_tempaddrs(idev, ifp, 0, 0, false, 3016 jiffies); 3017 ipv6_del_addr(ifp); 3018 addrconf_verify_rtnl(); 3019 if (ipv6_addr_is_multicast(pfx)) { 3020 ipv6_mc_config(net->ipv6.mc_autojoin_sk, 3021 false, pfx, dev->ifindex); 3022 } 3023 return 0; 3024 } 3025 } 3026 read_unlock_bh(&idev->lock); 3027 return -EADDRNOTAVAIL; 3028 } 3029 3030 3031 int addrconf_add_ifaddr(struct net *net, void __user *arg) 3032 { 3033 struct ifa6_config cfg = { 3034 .ifa_flags = IFA_F_PERMANENT, 3035 .preferred_lft = INFINITY_LIFE_TIME, 3036 .valid_lft = INFINITY_LIFE_TIME, 3037 }; 3038 struct in6_ifreq ireq; 3039 int err; 3040 3041 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 3042 return -EPERM; 3043 3044 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 3045 return -EFAULT; 3046 3047 cfg.pfx = &ireq.ifr6_addr; 3048 cfg.plen = ireq.ifr6_prefixlen; 3049 3050 rtnl_lock(); 3051 err = inet6_addr_add(net, ireq.ifr6_ifindex, &cfg, NULL); 3052 rtnl_unlock(); 3053 return err; 3054 } 3055 3056 int addrconf_del_ifaddr(struct net *net, void __user *arg) 3057 { 3058 struct in6_ifreq ireq; 3059 int err; 3060 3061 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 3062 return -EPERM; 3063 3064 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 3065 return -EFAULT; 3066 3067 rtnl_lock(); 3068 err = inet6_addr_del(net, ireq.ifr6_ifindex, 0, &ireq.ifr6_addr, 3069 ireq.ifr6_prefixlen); 3070 rtnl_unlock(); 3071 return err; 3072 } 3073 3074 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr, 3075 int plen, int scope) 3076 { 3077 struct inet6_ifaddr *ifp; 3078 struct ifa6_config cfg = { 3079 .pfx = addr, 3080 .plen = plen, 3081 .ifa_flags = IFA_F_PERMANENT, 3082 .valid_lft = INFINITY_LIFE_TIME, 3083 .preferred_lft = INFINITY_LIFE_TIME, 3084 .scope = scope 3085 }; 3086 3087 ifp = ipv6_add_addr(idev, &cfg, true, NULL); 3088 if (!IS_ERR(ifp)) { 3089 spin_lock_bh(&ifp->lock); 3090 ifp->flags &= ~IFA_F_TENTATIVE; 3091 spin_unlock_bh(&ifp->lock); 3092 rt_genid_bump_ipv6(dev_net(idev->dev)); 3093 ipv6_ifa_notify(RTM_NEWADDR, ifp); 3094 in6_ifa_put(ifp); 3095 } 3096 } 3097 3098 #if IS_ENABLED(CONFIG_IPV6_SIT) 3099 static void sit_add_v4_addrs(struct inet6_dev *idev) 3100 { 3101 struct in6_addr addr; 3102 struct net_device *dev; 3103 struct net *net = dev_net(idev->dev); 3104 int scope, plen; 3105 u32 pflags = 0; 3106 3107 ASSERT_RTNL(); 3108 3109 memset(&addr, 0, sizeof(struct in6_addr)); 3110 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4); 3111 3112 if (idev->dev->flags&IFF_POINTOPOINT) { 3113 addr.s6_addr32[0] = htonl(0xfe800000); 3114 scope = IFA_LINK; 3115 plen = 64; 3116 } else { 3117 scope = IPV6_ADDR_COMPATv4; 3118 plen = 96; 3119 pflags |= RTF_NONEXTHOP; 3120 } 3121 3122 if (addr.s6_addr32[3]) { 3123 add_addr(idev, &addr, plen, scope); 3124 addrconf_prefix_route(&addr, plen, 0, idev->dev, 0, pflags, 3125 GFP_KERNEL); 3126 return; 3127 } 3128 3129 for_each_netdev(net, dev) { 3130 struct in_device *in_dev = __in_dev_get_rtnl(dev); 3131 if (in_dev && (dev->flags & IFF_UP)) { 3132 struct in_ifaddr *ifa; 3133 int flag = scope; 3134 3135 in_dev_for_each_ifa_rtnl(ifa, in_dev) { 3136 addr.s6_addr32[3] = ifa->ifa_local; 3137 3138 if (ifa->ifa_scope == RT_SCOPE_LINK) 3139 continue; 3140 if (ifa->ifa_scope >= RT_SCOPE_HOST) { 3141 if (idev->dev->flags&IFF_POINTOPOINT) 3142 continue; 3143 flag |= IFA_HOST; 3144 } 3145 3146 add_addr(idev, &addr, plen, flag); 3147 addrconf_prefix_route(&addr, plen, 0, idev->dev, 3148 0, pflags, GFP_KERNEL); 3149 } 3150 } 3151 } 3152 } 3153 #endif 3154 3155 static void init_loopback(struct net_device *dev) 3156 { 3157 struct inet6_dev *idev; 3158 3159 /* ::1 */ 3160 3161 ASSERT_RTNL(); 3162 3163 idev = ipv6_find_idev(dev); 3164 if (IS_ERR(idev)) { 3165 pr_debug("%s: add_dev failed\n", __func__); 3166 return; 3167 } 3168 3169 add_addr(idev, &in6addr_loopback, 128, IFA_HOST); 3170 } 3171 3172 void addrconf_add_linklocal(struct inet6_dev *idev, 3173 const struct in6_addr *addr, u32 flags) 3174 { 3175 struct ifa6_config cfg = { 3176 .pfx = addr, 3177 .plen = 64, 3178 .ifa_flags = flags | IFA_F_PERMANENT, 3179 .valid_lft = INFINITY_LIFE_TIME, 3180 .preferred_lft = INFINITY_LIFE_TIME, 3181 .scope = IFA_LINK 3182 }; 3183 struct inet6_ifaddr *ifp; 3184 3185 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 3186 if ((dev_net(idev->dev)->ipv6.devconf_all->optimistic_dad || 3187 idev->cnf.optimistic_dad) && 3188 !dev_net(idev->dev)->ipv6.devconf_all->forwarding) 3189 cfg.ifa_flags |= IFA_F_OPTIMISTIC; 3190 #endif 3191 3192 ifp = ipv6_add_addr(idev, &cfg, true, NULL); 3193 if (!IS_ERR(ifp)) { 3194 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, 0, idev->dev, 3195 0, 0, GFP_ATOMIC); 3196 addrconf_dad_start(ifp); 3197 in6_ifa_put(ifp); 3198 } 3199 } 3200 EXPORT_SYMBOL_GPL(addrconf_add_linklocal); 3201 3202 static bool ipv6_reserved_interfaceid(struct in6_addr address) 3203 { 3204 if ((address.s6_addr32[2] | address.s6_addr32[3]) == 0) 3205 return true; 3206 3207 if (address.s6_addr32[2] == htonl(0x02005eff) && 3208 ((address.s6_addr32[3] & htonl(0xfe000000)) == htonl(0xfe000000))) 3209 return true; 3210 3211 if (address.s6_addr32[2] == htonl(0xfdffffff) && 3212 ((address.s6_addr32[3] & htonl(0xffffff80)) == htonl(0xffffff80))) 3213 return true; 3214 3215 return false; 3216 } 3217 3218 static int ipv6_generate_stable_address(struct in6_addr *address, 3219 u8 dad_count, 3220 const struct inet6_dev *idev) 3221 { 3222 static DEFINE_SPINLOCK(lock); 3223 static __u32 digest[SHA_DIGEST_WORDS]; 3224 static __u32 workspace[SHA_WORKSPACE_WORDS]; 3225 3226 static union { 3227 char __data[SHA_MESSAGE_BYTES]; 3228 struct { 3229 struct in6_addr secret; 3230 __be32 prefix[2]; 3231 unsigned char hwaddr[MAX_ADDR_LEN]; 3232 u8 dad_count; 3233 } __packed; 3234 } data; 3235 3236 struct in6_addr secret; 3237 struct in6_addr temp; 3238 struct net *net = dev_net(idev->dev); 3239 3240 BUILD_BUG_ON(sizeof(data.__data) != sizeof(data)); 3241 3242 if (idev->cnf.stable_secret.initialized) 3243 secret = idev->cnf.stable_secret.secret; 3244 else if (net->ipv6.devconf_dflt->stable_secret.initialized) 3245 secret = net->ipv6.devconf_dflt->stable_secret.secret; 3246 else 3247 return -1; 3248 3249 retry: 3250 spin_lock_bh(&lock); 3251 3252 sha_init(digest); 3253 memset(&data, 0, sizeof(data)); 3254 memset(workspace, 0, sizeof(workspace)); 3255 memcpy(data.hwaddr, idev->dev->perm_addr, idev->dev->addr_len); 3256 data.prefix[0] = address->s6_addr32[0]; 3257 data.prefix[1] = address->s6_addr32[1]; 3258 data.secret = secret; 3259 data.dad_count = dad_count; 3260 3261 sha_transform(digest, data.__data, workspace); 3262 3263 temp = *address; 3264 temp.s6_addr32[2] = (__force __be32)digest[0]; 3265 temp.s6_addr32[3] = (__force __be32)digest[1]; 3266 3267 spin_unlock_bh(&lock); 3268 3269 if (ipv6_reserved_interfaceid(temp)) { 3270 dad_count++; 3271 if (dad_count > dev_net(idev->dev)->ipv6.sysctl.idgen_retries) 3272 return -1; 3273 goto retry; 3274 } 3275 3276 *address = temp; 3277 return 0; 3278 } 3279 3280 static void ipv6_gen_mode_random_init(struct inet6_dev *idev) 3281 { 3282 struct ipv6_stable_secret *s = &idev->cnf.stable_secret; 3283 3284 if (s->initialized) 3285 return; 3286 s = &idev->cnf.stable_secret; 3287 get_random_bytes(&s->secret, sizeof(s->secret)); 3288 s->initialized = true; 3289 } 3290 3291 static void addrconf_addr_gen(struct inet6_dev *idev, bool prefix_route) 3292 { 3293 struct in6_addr addr; 3294 3295 /* no link local addresses on L3 master devices */ 3296 if (netif_is_l3_master(idev->dev)) 3297 return; 3298 3299 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0); 3300 3301 switch (idev->cnf.addr_gen_mode) { 3302 case IN6_ADDR_GEN_MODE_RANDOM: 3303 ipv6_gen_mode_random_init(idev); 3304 /* fallthrough */ 3305 case IN6_ADDR_GEN_MODE_STABLE_PRIVACY: 3306 if (!ipv6_generate_stable_address(&addr, 0, idev)) 3307 addrconf_add_linklocal(idev, &addr, 3308 IFA_F_STABLE_PRIVACY); 3309 else if (prefix_route) 3310 addrconf_prefix_route(&addr, 64, 0, idev->dev, 3311 0, 0, GFP_KERNEL); 3312 break; 3313 case IN6_ADDR_GEN_MODE_EUI64: 3314 /* addrconf_add_linklocal also adds a prefix_route and we 3315 * only need to care about prefix routes if ipv6_generate_eui64 3316 * couldn't generate one. 3317 */ 3318 if (ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) == 0) 3319 addrconf_add_linklocal(idev, &addr, 0); 3320 else if (prefix_route) 3321 addrconf_prefix_route(&addr, 64, 0, idev->dev, 3322 0, 0, GFP_KERNEL); 3323 break; 3324 case IN6_ADDR_GEN_MODE_NONE: 3325 default: 3326 /* will not add any link local address */ 3327 break; 3328 } 3329 } 3330 3331 static void addrconf_dev_config(struct net_device *dev) 3332 { 3333 struct inet6_dev *idev; 3334 3335 ASSERT_RTNL(); 3336 3337 if ((dev->type != ARPHRD_ETHER) && 3338 (dev->type != ARPHRD_FDDI) && 3339 (dev->type != ARPHRD_ARCNET) && 3340 (dev->type != ARPHRD_INFINIBAND) && 3341 (dev->type != ARPHRD_IEEE1394) && 3342 (dev->type != ARPHRD_TUNNEL6) && 3343 (dev->type != ARPHRD_6LOWPAN) && 3344 (dev->type != ARPHRD_IP6GRE) && 3345 (dev->type != ARPHRD_IPGRE) && 3346 (dev->type != ARPHRD_TUNNEL) && 3347 (dev->type != ARPHRD_NONE) && 3348 (dev->type != ARPHRD_RAWIP)) { 3349 /* Alas, we support only Ethernet autoconfiguration. */ 3350 idev = __in6_dev_get(dev); 3351 if (!IS_ERR_OR_NULL(idev) && dev->flags & IFF_UP && 3352 dev->flags & IFF_MULTICAST) 3353 ipv6_mc_up(idev); 3354 return; 3355 } 3356 3357 idev = addrconf_add_dev(dev); 3358 if (IS_ERR(idev)) 3359 return; 3360 3361 /* this device type has no EUI support */ 3362 if (dev->type == ARPHRD_NONE && 3363 idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_EUI64) 3364 idev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_RANDOM; 3365 3366 addrconf_addr_gen(idev, false); 3367 } 3368 3369 #if IS_ENABLED(CONFIG_IPV6_SIT) 3370 static void addrconf_sit_config(struct net_device *dev) 3371 { 3372 struct inet6_dev *idev; 3373 3374 ASSERT_RTNL(); 3375 3376 /* 3377 * Configure the tunnel with one of our IPv4 3378 * addresses... we should configure all of 3379 * our v4 addrs in the tunnel 3380 */ 3381 3382 idev = ipv6_find_idev(dev); 3383 if (IS_ERR(idev)) { 3384 pr_debug("%s: add_dev failed\n", __func__); 3385 return; 3386 } 3387 3388 if (dev->priv_flags & IFF_ISATAP) { 3389 addrconf_addr_gen(idev, false); 3390 return; 3391 } 3392 3393 sit_add_v4_addrs(idev); 3394 3395 if (dev->flags&IFF_POINTOPOINT) 3396 addrconf_add_mroute(dev); 3397 } 3398 #endif 3399 3400 #if IS_ENABLED(CONFIG_NET_IPGRE) 3401 static void addrconf_gre_config(struct net_device *dev) 3402 { 3403 struct inet6_dev *idev; 3404 3405 ASSERT_RTNL(); 3406 3407 idev = ipv6_find_idev(dev); 3408 if (IS_ERR(idev)) { 3409 pr_debug("%s: add_dev failed\n", __func__); 3410 return; 3411 } 3412 3413 addrconf_addr_gen(idev, true); 3414 if (dev->flags & IFF_POINTOPOINT) 3415 addrconf_add_mroute(dev); 3416 } 3417 #endif 3418 3419 static int fixup_permanent_addr(struct net *net, 3420 struct inet6_dev *idev, 3421 struct inet6_ifaddr *ifp) 3422 { 3423 /* !fib6_node means the host route was removed from the 3424 * FIB, for example, if 'lo' device is taken down. In that 3425 * case regenerate the host route. 3426 */ 3427 if (!ifp->rt || !ifp->rt->fib6_node) { 3428 struct fib6_info *f6i, *prev; 3429 3430 f6i = addrconf_f6i_alloc(net, idev, &ifp->addr, false, 3431 GFP_ATOMIC); 3432 if (IS_ERR(f6i)) 3433 return PTR_ERR(f6i); 3434 3435 /* ifp->rt can be accessed outside of rtnl */ 3436 spin_lock(&ifp->lock); 3437 prev = ifp->rt; 3438 ifp->rt = f6i; 3439 spin_unlock(&ifp->lock); 3440 3441 fib6_info_release(prev); 3442 } 3443 3444 if (!(ifp->flags & IFA_F_NOPREFIXROUTE)) { 3445 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, 3446 ifp->rt_priority, idev->dev, 0, 0, 3447 GFP_ATOMIC); 3448 } 3449 3450 if (ifp->state == INET6_IFADDR_STATE_PREDAD) 3451 addrconf_dad_start(ifp); 3452 3453 return 0; 3454 } 3455 3456 static void addrconf_permanent_addr(struct net *net, struct net_device *dev) 3457 { 3458 struct inet6_ifaddr *ifp, *tmp; 3459 struct inet6_dev *idev; 3460 3461 idev = __in6_dev_get(dev); 3462 if (!idev) 3463 return; 3464 3465 write_lock_bh(&idev->lock); 3466 3467 list_for_each_entry_safe(ifp, tmp, &idev->addr_list, if_list) { 3468 if ((ifp->flags & IFA_F_PERMANENT) && 3469 fixup_permanent_addr(net, idev, ifp) < 0) { 3470 write_unlock_bh(&idev->lock); 3471 in6_ifa_hold(ifp); 3472 ipv6_del_addr(ifp); 3473 write_lock_bh(&idev->lock); 3474 3475 net_info_ratelimited("%s: Failed to add prefix route for address %pI6c; dropping\n", 3476 idev->dev->name, &ifp->addr); 3477 } 3478 } 3479 3480 write_unlock_bh(&idev->lock); 3481 } 3482 3483 static int addrconf_notify(struct notifier_block *this, unsigned long event, 3484 void *ptr) 3485 { 3486 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 3487 struct netdev_notifier_change_info *change_info; 3488 struct netdev_notifier_changeupper_info *info; 3489 struct inet6_dev *idev = __in6_dev_get(dev); 3490 struct net *net = dev_net(dev); 3491 int run_pending = 0; 3492 int err; 3493 3494 switch (event) { 3495 case NETDEV_REGISTER: 3496 if (!idev && dev->mtu >= IPV6_MIN_MTU) { 3497 idev = ipv6_add_dev(dev); 3498 if (IS_ERR(idev)) 3499 return notifier_from_errno(PTR_ERR(idev)); 3500 } 3501 break; 3502 3503 case NETDEV_CHANGEMTU: 3504 /* if MTU under IPV6_MIN_MTU stop IPv6 on this interface. */ 3505 if (dev->mtu < IPV6_MIN_MTU) { 3506 addrconf_ifdown(dev, dev != net->loopback_dev); 3507 break; 3508 } 3509 3510 if (idev) { 3511 rt6_mtu_change(dev, dev->mtu); 3512 idev->cnf.mtu6 = dev->mtu; 3513 break; 3514 } 3515 3516 /* allocate new idev */ 3517 idev = ipv6_add_dev(dev); 3518 if (IS_ERR(idev)) 3519 break; 3520 3521 /* device is still not ready */ 3522 if (!(idev->if_flags & IF_READY)) 3523 break; 3524 3525 run_pending = 1; 3526 3527 /* fall through */ 3528 3529 case NETDEV_UP: 3530 case NETDEV_CHANGE: 3531 if (dev->flags & IFF_SLAVE) 3532 break; 3533 3534 if (idev && idev->cnf.disable_ipv6) 3535 break; 3536 3537 if (event == NETDEV_UP) { 3538 /* restore routes for permanent addresses */ 3539 addrconf_permanent_addr(net, dev); 3540 3541 if (!addrconf_link_ready(dev)) { 3542 /* device is not ready yet. */ 3543 pr_debug("ADDRCONF(NETDEV_UP): %s: link is not ready\n", 3544 dev->name); 3545 break; 3546 } 3547 3548 if (!idev && dev->mtu >= IPV6_MIN_MTU) 3549 idev = ipv6_add_dev(dev); 3550 3551 if (!IS_ERR_OR_NULL(idev)) { 3552 idev->if_flags |= IF_READY; 3553 run_pending = 1; 3554 } 3555 } else if (event == NETDEV_CHANGE) { 3556 if (!addrconf_link_ready(dev)) { 3557 /* device is still not ready. */ 3558 rt6_sync_down_dev(dev, event); 3559 break; 3560 } 3561 3562 if (!IS_ERR_OR_NULL(idev)) { 3563 if (idev->if_flags & IF_READY) { 3564 /* device is already configured - 3565 * but resend MLD reports, we might 3566 * have roamed and need to update 3567 * multicast snooping switches 3568 */ 3569 ipv6_mc_up(idev); 3570 change_info = ptr; 3571 if (change_info->flags_changed & IFF_NOARP) 3572 addrconf_dad_run(idev, true); 3573 rt6_sync_up(dev, RTNH_F_LINKDOWN); 3574 break; 3575 } 3576 idev->if_flags |= IF_READY; 3577 } 3578 3579 pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n", 3580 dev->name); 3581 3582 run_pending = 1; 3583 } 3584 3585 switch (dev->type) { 3586 #if IS_ENABLED(CONFIG_IPV6_SIT) 3587 case ARPHRD_SIT: 3588 addrconf_sit_config(dev); 3589 break; 3590 #endif 3591 #if IS_ENABLED(CONFIG_NET_IPGRE) 3592 case ARPHRD_IPGRE: 3593 addrconf_gre_config(dev); 3594 break; 3595 #endif 3596 case ARPHRD_LOOPBACK: 3597 init_loopback(dev); 3598 break; 3599 3600 default: 3601 addrconf_dev_config(dev); 3602 break; 3603 } 3604 3605 if (!IS_ERR_OR_NULL(idev)) { 3606 if (run_pending) 3607 addrconf_dad_run(idev, false); 3608 3609 /* Device has an address by now */ 3610 rt6_sync_up(dev, RTNH_F_DEAD); 3611 3612 /* 3613 * If the MTU changed during the interface down, 3614 * when the interface up, the changed MTU must be 3615 * reflected in the idev as well as routers. 3616 */ 3617 if (idev->cnf.mtu6 != dev->mtu && 3618 dev->mtu >= IPV6_MIN_MTU) { 3619 rt6_mtu_change(dev, dev->mtu); 3620 idev->cnf.mtu6 = dev->mtu; 3621 } 3622 idev->tstamp = jiffies; 3623 inet6_ifinfo_notify(RTM_NEWLINK, idev); 3624 3625 /* 3626 * If the changed mtu during down is lower than 3627 * IPV6_MIN_MTU stop IPv6 on this interface. 3628 */ 3629 if (dev->mtu < IPV6_MIN_MTU) 3630 addrconf_ifdown(dev, dev != net->loopback_dev); 3631 } 3632 break; 3633 3634 case NETDEV_DOWN: 3635 case NETDEV_UNREGISTER: 3636 /* 3637 * Remove all addresses from this interface. 3638 */ 3639 addrconf_ifdown(dev, event != NETDEV_DOWN); 3640 break; 3641 3642 case NETDEV_CHANGENAME: 3643 if (idev) { 3644 snmp6_unregister_dev(idev); 3645 addrconf_sysctl_unregister(idev); 3646 err = addrconf_sysctl_register(idev); 3647 if (err) 3648 return notifier_from_errno(err); 3649 err = snmp6_register_dev(idev); 3650 if (err) { 3651 addrconf_sysctl_unregister(idev); 3652 return notifier_from_errno(err); 3653 } 3654 } 3655 break; 3656 3657 case NETDEV_PRE_TYPE_CHANGE: 3658 case NETDEV_POST_TYPE_CHANGE: 3659 if (idev) 3660 addrconf_type_change(dev, event); 3661 break; 3662 3663 case NETDEV_CHANGEUPPER: 3664 info = ptr; 3665 3666 /* flush all routes if dev is linked to or unlinked from 3667 * an L3 master device (e.g., VRF) 3668 */ 3669 if (info->upper_dev && netif_is_l3_master(info->upper_dev)) 3670 addrconf_ifdown(dev, 0); 3671 } 3672 3673 return NOTIFY_OK; 3674 } 3675 3676 /* 3677 * addrconf module should be notified of a device going up 3678 */ 3679 static struct notifier_block ipv6_dev_notf = { 3680 .notifier_call = addrconf_notify, 3681 .priority = ADDRCONF_NOTIFY_PRIORITY, 3682 }; 3683 3684 static void addrconf_type_change(struct net_device *dev, unsigned long event) 3685 { 3686 struct inet6_dev *idev; 3687 ASSERT_RTNL(); 3688 3689 idev = __in6_dev_get(dev); 3690 3691 if (event == NETDEV_POST_TYPE_CHANGE) 3692 ipv6_mc_remap(idev); 3693 else if (event == NETDEV_PRE_TYPE_CHANGE) 3694 ipv6_mc_unmap(idev); 3695 } 3696 3697 static bool addr_is_local(const struct in6_addr *addr) 3698 { 3699 return ipv6_addr_type(addr) & 3700 (IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK); 3701 } 3702 3703 static int addrconf_ifdown(struct net_device *dev, int how) 3704 { 3705 unsigned long event = how ? NETDEV_UNREGISTER : NETDEV_DOWN; 3706 struct net *net = dev_net(dev); 3707 struct inet6_dev *idev; 3708 struct inet6_ifaddr *ifa, *tmp; 3709 bool keep_addr = false; 3710 int state, i; 3711 3712 ASSERT_RTNL(); 3713 3714 rt6_disable_ip(dev, event); 3715 3716 idev = __in6_dev_get(dev); 3717 if (!idev) 3718 return -ENODEV; 3719 3720 /* 3721 * Step 1: remove reference to ipv6 device from parent device. 3722 * Do not dev_put! 3723 */ 3724 if (how) { 3725 idev->dead = 1; 3726 3727 /* protected by rtnl_lock */ 3728 RCU_INIT_POINTER(dev->ip6_ptr, NULL); 3729 3730 /* Step 1.5: remove snmp6 entry */ 3731 snmp6_unregister_dev(idev); 3732 3733 } 3734 3735 /* combine the user config with event to determine if permanent 3736 * addresses are to be removed from address hash table 3737 */ 3738 if (!how && !idev->cnf.disable_ipv6) { 3739 /* aggregate the system setting and interface setting */ 3740 int _keep_addr = net->ipv6.devconf_all->keep_addr_on_down; 3741 3742 if (!_keep_addr) 3743 _keep_addr = idev->cnf.keep_addr_on_down; 3744 3745 keep_addr = (_keep_addr > 0); 3746 } 3747 3748 /* Step 2: clear hash table */ 3749 for (i = 0; i < IN6_ADDR_HSIZE; i++) { 3750 struct hlist_head *h = &inet6_addr_lst[i]; 3751 3752 spin_lock_bh(&addrconf_hash_lock); 3753 restart: 3754 hlist_for_each_entry_rcu(ifa, h, addr_lst) { 3755 if (ifa->idev == idev) { 3756 addrconf_del_dad_work(ifa); 3757 /* combined flag + permanent flag decide if 3758 * address is retained on a down event 3759 */ 3760 if (!keep_addr || 3761 !(ifa->flags & IFA_F_PERMANENT) || 3762 addr_is_local(&ifa->addr)) { 3763 hlist_del_init_rcu(&ifa->addr_lst); 3764 goto restart; 3765 } 3766 } 3767 } 3768 spin_unlock_bh(&addrconf_hash_lock); 3769 } 3770 3771 write_lock_bh(&idev->lock); 3772 3773 addrconf_del_rs_timer(idev); 3774 3775 /* Step 2: clear flags for stateless addrconf */ 3776 if (!how) 3777 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY); 3778 3779 /* Step 3: clear tempaddr list */ 3780 while (!list_empty(&idev->tempaddr_list)) { 3781 ifa = list_first_entry(&idev->tempaddr_list, 3782 struct inet6_ifaddr, tmp_list); 3783 list_del(&ifa->tmp_list); 3784 write_unlock_bh(&idev->lock); 3785 spin_lock_bh(&ifa->lock); 3786 3787 if (ifa->ifpub) { 3788 in6_ifa_put(ifa->ifpub); 3789 ifa->ifpub = NULL; 3790 } 3791 spin_unlock_bh(&ifa->lock); 3792 in6_ifa_put(ifa); 3793 write_lock_bh(&idev->lock); 3794 } 3795 3796 list_for_each_entry_safe(ifa, tmp, &idev->addr_list, if_list) { 3797 struct fib6_info *rt = NULL; 3798 bool keep; 3799 3800 addrconf_del_dad_work(ifa); 3801 3802 keep = keep_addr && (ifa->flags & IFA_F_PERMANENT) && 3803 !addr_is_local(&ifa->addr); 3804 3805 write_unlock_bh(&idev->lock); 3806 spin_lock_bh(&ifa->lock); 3807 3808 if (keep) { 3809 /* set state to skip the notifier below */ 3810 state = INET6_IFADDR_STATE_DEAD; 3811 ifa->state = INET6_IFADDR_STATE_PREDAD; 3812 if (!(ifa->flags & IFA_F_NODAD)) 3813 ifa->flags |= IFA_F_TENTATIVE; 3814 3815 rt = ifa->rt; 3816 ifa->rt = NULL; 3817 } else { 3818 state = ifa->state; 3819 ifa->state = INET6_IFADDR_STATE_DEAD; 3820 } 3821 3822 spin_unlock_bh(&ifa->lock); 3823 3824 if (rt) 3825 ip6_del_rt(net, rt); 3826 3827 if (state != INET6_IFADDR_STATE_DEAD) { 3828 __ipv6_ifa_notify(RTM_DELADDR, ifa); 3829 inet6addr_notifier_call_chain(NETDEV_DOWN, ifa); 3830 } else { 3831 if (idev->cnf.forwarding) 3832 addrconf_leave_anycast(ifa); 3833 addrconf_leave_solict(ifa->idev, &ifa->addr); 3834 } 3835 3836 write_lock_bh(&idev->lock); 3837 if (!keep) { 3838 list_del_rcu(&ifa->if_list); 3839 in6_ifa_put(ifa); 3840 } 3841 } 3842 3843 write_unlock_bh(&idev->lock); 3844 3845 /* Step 5: Discard anycast and multicast list */ 3846 if (how) { 3847 ipv6_ac_destroy_dev(idev); 3848 ipv6_mc_destroy_dev(idev); 3849 } else { 3850 ipv6_mc_down(idev); 3851 } 3852 3853 idev->tstamp = jiffies; 3854 3855 /* Last: Shot the device (if unregistered) */ 3856 if (how) { 3857 addrconf_sysctl_unregister(idev); 3858 neigh_parms_release(&nd_tbl, idev->nd_parms); 3859 neigh_ifdown(&nd_tbl, dev); 3860 in6_dev_put(idev); 3861 } 3862 return 0; 3863 } 3864 3865 static void addrconf_rs_timer(struct timer_list *t) 3866 { 3867 struct inet6_dev *idev = from_timer(idev, t, rs_timer); 3868 struct net_device *dev = idev->dev; 3869 struct in6_addr lladdr; 3870 3871 write_lock(&idev->lock); 3872 if (idev->dead || !(idev->if_flags & IF_READY)) 3873 goto out; 3874 3875 if (!ipv6_accept_ra(idev)) 3876 goto out; 3877 3878 /* Announcement received after solicitation was sent */ 3879 if (idev->if_flags & IF_RA_RCVD) 3880 goto out; 3881 3882 if (idev->rs_probes++ < idev->cnf.rtr_solicits || idev->cnf.rtr_solicits < 0) { 3883 write_unlock(&idev->lock); 3884 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE)) 3885 ndisc_send_rs(dev, &lladdr, 3886 &in6addr_linklocal_allrouters); 3887 else 3888 goto put; 3889 3890 write_lock(&idev->lock); 3891 idev->rs_interval = rfc3315_s14_backoff_update( 3892 idev->rs_interval, idev->cnf.rtr_solicit_max_interval); 3893 /* The wait after the last probe can be shorter */ 3894 addrconf_mod_rs_timer(idev, (idev->rs_probes == 3895 idev->cnf.rtr_solicits) ? 3896 idev->cnf.rtr_solicit_delay : 3897 idev->rs_interval); 3898 } else { 3899 /* 3900 * Note: we do not support deprecated "all on-link" 3901 * assumption any longer. 3902 */ 3903 pr_debug("%s: no IPv6 routers present\n", idev->dev->name); 3904 } 3905 3906 out: 3907 write_unlock(&idev->lock); 3908 put: 3909 in6_dev_put(idev); 3910 } 3911 3912 /* 3913 * Duplicate Address Detection 3914 */ 3915 static void addrconf_dad_kick(struct inet6_ifaddr *ifp) 3916 { 3917 unsigned long rand_num; 3918 struct inet6_dev *idev = ifp->idev; 3919 u64 nonce; 3920 3921 if (ifp->flags & IFA_F_OPTIMISTIC) 3922 rand_num = 0; 3923 else 3924 rand_num = prandom_u32() % (idev->cnf.rtr_solicit_delay ? : 1); 3925 3926 nonce = 0; 3927 if (idev->cnf.enhanced_dad || 3928 dev_net(idev->dev)->ipv6.devconf_all->enhanced_dad) { 3929 do 3930 get_random_bytes(&nonce, 6); 3931 while (nonce == 0); 3932 } 3933 ifp->dad_nonce = nonce; 3934 ifp->dad_probes = idev->cnf.dad_transmits; 3935 addrconf_mod_dad_work(ifp, rand_num); 3936 } 3937 3938 static void addrconf_dad_begin(struct inet6_ifaddr *ifp) 3939 { 3940 struct inet6_dev *idev = ifp->idev; 3941 struct net_device *dev = idev->dev; 3942 bool bump_id, notify = false; 3943 struct net *net; 3944 3945 addrconf_join_solict(dev, &ifp->addr); 3946 3947 prandom_seed((__force u32) ifp->addr.s6_addr32[3]); 3948 3949 read_lock_bh(&idev->lock); 3950 spin_lock(&ifp->lock); 3951 if (ifp->state == INET6_IFADDR_STATE_DEAD) 3952 goto out; 3953 3954 net = dev_net(dev); 3955 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) || 3956 (net->ipv6.devconf_all->accept_dad < 1 && 3957 idev->cnf.accept_dad < 1) || 3958 !(ifp->flags&IFA_F_TENTATIVE) || 3959 ifp->flags & IFA_F_NODAD) { 3960 bool send_na = false; 3961 3962 if (ifp->flags & IFA_F_TENTATIVE && 3963 !(ifp->flags & IFA_F_OPTIMISTIC)) 3964 send_na = true; 3965 bump_id = ifp->flags & IFA_F_TENTATIVE; 3966 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED); 3967 spin_unlock(&ifp->lock); 3968 read_unlock_bh(&idev->lock); 3969 3970 addrconf_dad_completed(ifp, bump_id, send_na); 3971 return; 3972 } 3973 3974 if (!(idev->if_flags & IF_READY)) { 3975 spin_unlock(&ifp->lock); 3976 read_unlock_bh(&idev->lock); 3977 /* 3978 * If the device is not ready: 3979 * - keep it tentative if it is a permanent address. 3980 * - otherwise, kill it. 3981 */ 3982 in6_ifa_hold(ifp); 3983 addrconf_dad_stop(ifp, 0); 3984 return; 3985 } 3986 3987 /* 3988 * Optimistic nodes can start receiving 3989 * Frames right away 3990 */ 3991 if (ifp->flags & IFA_F_OPTIMISTIC) { 3992 ip6_ins_rt(net, ifp->rt); 3993 if (ipv6_use_optimistic_addr(net, idev)) { 3994 /* Because optimistic nodes can use this address, 3995 * notify listeners. If DAD fails, RTM_DELADDR is sent. 3996 */ 3997 notify = true; 3998 } 3999 } 4000 4001 addrconf_dad_kick(ifp); 4002 out: 4003 spin_unlock(&ifp->lock); 4004 read_unlock_bh(&idev->lock); 4005 if (notify) 4006 ipv6_ifa_notify(RTM_NEWADDR, ifp); 4007 } 4008 4009 static void addrconf_dad_start(struct inet6_ifaddr *ifp) 4010 { 4011 bool begin_dad = false; 4012 4013 spin_lock_bh(&ifp->lock); 4014 if (ifp->state != INET6_IFADDR_STATE_DEAD) { 4015 ifp->state = INET6_IFADDR_STATE_PREDAD; 4016 begin_dad = true; 4017 } 4018 spin_unlock_bh(&ifp->lock); 4019 4020 if (begin_dad) 4021 addrconf_mod_dad_work(ifp, 0); 4022 } 4023 4024 static void addrconf_dad_work(struct work_struct *w) 4025 { 4026 struct inet6_ifaddr *ifp = container_of(to_delayed_work(w), 4027 struct inet6_ifaddr, 4028 dad_work); 4029 struct inet6_dev *idev = ifp->idev; 4030 bool bump_id, disable_ipv6 = false; 4031 struct in6_addr mcaddr; 4032 4033 enum { 4034 DAD_PROCESS, 4035 DAD_BEGIN, 4036 DAD_ABORT, 4037 } action = DAD_PROCESS; 4038 4039 rtnl_lock(); 4040 4041 spin_lock_bh(&ifp->lock); 4042 if (ifp->state == INET6_IFADDR_STATE_PREDAD) { 4043 action = DAD_BEGIN; 4044 ifp->state = INET6_IFADDR_STATE_DAD; 4045 } else if (ifp->state == INET6_IFADDR_STATE_ERRDAD) { 4046 action = DAD_ABORT; 4047 ifp->state = INET6_IFADDR_STATE_POSTDAD; 4048 4049 if ((dev_net(idev->dev)->ipv6.devconf_all->accept_dad > 1 || 4050 idev->cnf.accept_dad > 1) && 4051 !idev->cnf.disable_ipv6 && 4052 !(ifp->flags & IFA_F_STABLE_PRIVACY)) { 4053 struct in6_addr addr; 4054 4055 addr.s6_addr32[0] = htonl(0xfe800000); 4056 addr.s6_addr32[1] = 0; 4057 4058 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) && 4059 ipv6_addr_equal(&ifp->addr, &addr)) { 4060 /* DAD failed for link-local based on MAC */ 4061 idev->cnf.disable_ipv6 = 1; 4062 4063 pr_info("%s: IPv6 being disabled!\n", 4064 ifp->idev->dev->name); 4065 disable_ipv6 = true; 4066 } 4067 } 4068 } 4069 spin_unlock_bh(&ifp->lock); 4070 4071 if (action == DAD_BEGIN) { 4072 addrconf_dad_begin(ifp); 4073 goto out; 4074 } else if (action == DAD_ABORT) { 4075 in6_ifa_hold(ifp); 4076 addrconf_dad_stop(ifp, 1); 4077 if (disable_ipv6) 4078 addrconf_ifdown(idev->dev, 0); 4079 goto out; 4080 } 4081 4082 if (!ifp->dad_probes && addrconf_dad_end(ifp)) 4083 goto out; 4084 4085 write_lock_bh(&idev->lock); 4086 if (idev->dead || !(idev->if_flags & IF_READY)) { 4087 write_unlock_bh(&idev->lock); 4088 goto out; 4089 } 4090 4091 spin_lock(&ifp->lock); 4092 if (ifp->state == INET6_IFADDR_STATE_DEAD) { 4093 spin_unlock(&ifp->lock); 4094 write_unlock_bh(&idev->lock); 4095 goto out; 4096 } 4097 4098 if (ifp->dad_probes == 0) { 4099 bool send_na = false; 4100 4101 /* 4102 * DAD was successful 4103 */ 4104 4105 if (ifp->flags & IFA_F_TENTATIVE && 4106 !(ifp->flags & IFA_F_OPTIMISTIC)) 4107 send_na = true; 4108 bump_id = ifp->flags & IFA_F_TENTATIVE; 4109 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED); 4110 spin_unlock(&ifp->lock); 4111 write_unlock_bh(&idev->lock); 4112 4113 addrconf_dad_completed(ifp, bump_id, send_na); 4114 4115 goto out; 4116 } 4117 4118 ifp->dad_probes--; 4119 addrconf_mod_dad_work(ifp, 4120 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME)); 4121 spin_unlock(&ifp->lock); 4122 write_unlock_bh(&idev->lock); 4123 4124 /* send a neighbour solicitation for our addr */ 4125 addrconf_addr_solict_mult(&ifp->addr, &mcaddr); 4126 ndisc_send_ns(ifp->idev->dev, &ifp->addr, &mcaddr, &in6addr_any, 4127 ifp->dad_nonce); 4128 out: 4129 in6_ifa_put(ifp); 4130 rtnl_unlock(); 4131 } 4132 4133 /* ifp->idev must be at least read locked */ 4134 static bool ipv6_lonely_lladdr(struct inet6_ifaddr *ifp) 4135 { 4136 struct inet6_ifaddr *ifpiter; 4137 struct inet6_dev *idev = ifp->idev; 4138 4139 list_for_each_entry_reverse(ifpiter, &idev->addr_list, if_list) { 4140 if (ifpiter->scope > IFA_LINK) 4141 break; 4142 if (ifp != ifpiter && ifpiter->scope == IFA_LINK && 4143 (ifpiter->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE| 4144 IFA_F_OPTIMISTIC|IFA_F_DADFAILED)) == 4145 IFA_F_PERMANENT) 4146 return false; 4147 } 4148 return true; 4149 } 4150 4151 static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id, 4152 bool send_na) 4153 { 4154 struct net_device *dev = ifp->idev->dev; 4155 struct in6_addr lladdr; 4156 bool send_rs, send_mld; 4157 4158 addrconf_del_dad_work(ifp); 4159 4160 /* 4161 * Configure the address for reception. Now it is valid. 4162 */ 4163 4164 ipv6_ifa_notify(RTM_NEWADDR, ifp); 4165 4166 /* If added prefix is link local and we are prepared to process 4167 router advertisements, start sending router solicitations. 4168 */ 4169 4170 read_lock_bh(&ifp->idev->lock); 4171 send_mld = ifp->scope == IFA_LINK && ipv6_lonely_lladdr(ifp); 4172 send_rs = send_mld && 4173 ipv6_accept_ra(ifp->idev) && 4174 ifp->idev->cnf.rtr_solicits != 0 && 4175 (dev->flags&IFF_LOOPBACK) == 0; 4176 read_unlock_bh(&ifp->idev->lock); 4177 4178 /* While dad is in progress mld report's source address is in6_addrany. 4179 * Resend with proper ll now. 4180 */ 4181 if (send_mld) 4182 ipv6_mc_dad_complete(ifp->idev); 4183 4184 /* send unsolicited NA if enabled */ 4185 if (send_na && 4186 (ifp->idev->cnf.ndisc_notify || 4187 dev_net(dev)->ipv6.devconf_all->ndisc_notify)) { 4188 ndisc_send_na(dev, &in6addr_linklocal_allnodes, &ifp->addr, 4189 /*router=*/ !!ifp->idev->cnf.forwarding, 4190 /*solicited=*/ false, /*override=*/ true, 4191 /*inc_opt=*/ true); 4192 } 4193 4194 if (send_rs) { 4195 /* 4196 * If a host as already performed a random delay 4197 * [...] as part of DAD [...] there is no need 4198 * to delay again before sending the first RS 4199 */ 4200 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE)) 4201 return; 4202 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters); 4203 4204 write_lock_bh(&ifp->idev->lock); 4205 spin_lock(&ifp->lock); 4206 ifp->idev->rs_interval = rfc3315_s14_backoff_init( 4207 ifp->idev->cnf.rtr_solicit_interval); 4208 ifp->idev->rs_probes = 1; 4209 ifp->idev->if_flags |= IF_RS_SENT; 4210 addrconf_mod_rs_timer(ifp->idev, ifp->idev->rs_interval); 4211 spin_unlock(&ifp->lock); 4212 write_unlock_bh(&ifp->idev->lock); 4213 } 4214 4215 if (bump_id) 4216 rt_genid_bump_ipv6(dev_net(dev)); 4217 4218 /* Make sure that a new temporary address will be created 4219 * before this temporary address becomes deprecated. 4220 */ 4221 if (ifp->flags & IFA_F_TEMPORARY) 4222 addrconf_verify_rtnl(); 4223 } 4224 4225 static void addrconf_dad_run(struct inet6_dev *idev, bool restart) 4226 { 4227 struct inet6_ifaddr *ifp; 4228 4229 read_lock_bh(&idev->lock); 4230 list_for_each_entry(ifp, &idev->addr_list, if_list) { 4231 spin_lock(&ifp->lock); 4232 if ((ifp->flags & IFA_F_TENTATIVE && 4233 ifp->state == INET6_IFADDR_STATE_DAD) || restart) { 4234 if (restart) 4235 ifp->state = INET6_IFADDR_STATE_PREDAD; 4236 addrconf_dad_kick(ifp); 4237 } 4238 spin_unlock(&ifp->lock); 4239 } 4240 read_unlock_bh(&idev->lock); 4241 } 4242 4243 #ifdef CONFIG_PROC_FS 4244 struct if6_iter_state { 4245 struct seq_net_private p; 4246 int bucket; 4247 int offset; 4248 }; 4249 4250 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos) 4251 { 4252 struct if6_iter_state *state = seq->private; 4253 struct net *net = seq_file_net(seq); 4254 struct inet6_ifaddr *ifa = NULL; 4255 int p = 0; 4256 4257 /* initial bucket if pos is 0 */ 4258 if (pos == 0) { 4259 state->bucket = 0; 4260 state->offset = 0; 4261 } 4262 4263 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) { 4264 hlist_for_each_entry_rcu(ifa, &inet6_addr_lst[state->bucket], 4265 addr_lst) { 4266 if (!net_eq(dev_net(ifa->idev->dev), net)) 4267 continue; 4268 /* sync with offset */ 4269 if (p < state->offset) { 4270 p++; 4271 continue; 4272 } 4273 return ifa; 4274 } 4275 4276 /* prepare for next bucket */ 4277 state->offset = 0; 4278 p = 0; 4279 } 4280 return NULL; 4281 } 4282 4283 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, 4284 struct inet6_ifaddr *ifa) 4285 { 4286 struct if6_iter_state *state = seq->private; 4287 struct net *net = seq_file_net(seq); 4288 4289 hlist_for_each_entry_continue_rcu(ifa, addr_lst) { 4290 if (!net_eq(dev_net(ifa->idev->dev), net)) 4291 continue; 4292 state->offset++; 4293 return ifa; 4294 } 4295 4296 state->offset = 0; 4297 while (++state->bucket < IN6_ADDR_HSIZE) { 4298 hlist_for_each_entry_rcu(ifa, 4299 &inet6_addr_lst[state->bucket], addr_lst) { 4300 if (!net_eq(dev_net(ifa->idev->dev), net)) 4301 continue; 4302 return ifa; 4303 } 4304 } 4305 4306 return NULL; 4307 } 4308 4309 static void *if6_seq_start(struct seq_file *seq, loff_t *pos) 4310 __acquires(rcu) 4311 { 4312 rcu_read_lock(); 4313 return if6_get_first(seq, *pos); 4314 } 4315 4316 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos) 4317 { 4318 struct inet6_ifaddr *ifa; 4319 4320 ifa = if6_get_next(seq, v); 4321 ++*pos; 4322 return ifa; 4323 } 4324 4325 static void if6_seq_stop(struct seq_file *seq, void *v) 4326 __releases(rcu) 4327 { 4328 rcu_read_unlock(); 4329 } 4330 4331 static int if6_seq_show(struct seq_file *seq, void *v) 4332 { 4333 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v; 4334 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n", 4335 &ifp->addr, 4336 ifp->idev->dev->ifindex, 4337 ifp->prefix_len, 4338 ifp->scope, 4339 (u8) ifp->flags, 4340 ifp->idev->dev->name); 4341 return 0; 4342 } 4343 4344 static const struct seq_operations if6_seq_ops = { 4345 .start = if6_seq_start, 4346 .next = if6_seq_next, 4347 .show = if6_seq_show, 4348 .stop = if6_seq_stop, 4349 }; 4350 4351 static int __net_init if6_proc_net_init(struct net *net) 4352 { 4353 if (!proc_create_net("if_inet6", 0444, net->proc_net, &if6_seq_ops, 4354 sizeof(struct if6_iter_state))) 4355 return -ENOMEM; 4356 return 0; 4357 } 4358 4359 static void __net_exit if6_proc_net_exit(struct net *net) 4360 { 4361 remove_proc_entry("if_inet6", net->proc_net); 4362 } 4363 4364 static struct pernet_operations if6_proc_net_ops = { 4365 .init = if6_proc_net_init, 4366 .exit = if6_proc_net_exit, 4367 }; 4368 4369 int __init if6_proc_init(void) 4370 { 4371 return register_pernet_subsys(&if6_proc_net_ops); 4372 } 4373 4374 void if6_proc_exit(void) 4375 { 4376 unregister_pernet_subsys(&if6_proc_net_ops); 4377 } 4378 #endif /* CONFIG_PROC_FS */ 4379 4380 #if IS_ENABLED(CONFIG_IPV6_MIP6) 4381 /* Check if address is a home address configured on any interface. */ 4382 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr) 4383 { 4384 unsigned int hash = inet6_addr_hash(net, addr); 4385 struct inet6_ifaddr *ifp = NULL; 4386 int ret = 0; 4387 4388 rcu_read_lock(); 4389 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) { 4390 if (!net_eq(dev_net(ifp->idev->dev), net)) 4391 continue; 4392 if (ipv6_addr_equal(&ifp->addr, addr) && 4393 (ifp->flags & IFA_F_HOMEADDRESS)) { 4394 ret = 1; 4395 break; 4396 } 4397 } 4398 rcu_read_unlock(); 4399 return ret; 4400 } 4401 #endif 4402 4403 /* 4404 * Periodic address status verification 4405 */ 4406 4407 static void addrconf_verify_rtnl(void) 4408 { 4409 unsigned long now, next, next_sec, next_sched; 4410 struct inet6_ifaddr *ifp; 4411 int i; 4412 4413 ASSERT_RTNL(); 4414 4415 rcu_read_lock_bh(); 4416 now = jiffies; 4417 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY); 4418 4419 cancel_delayed_work(&addr_chk_work); 4420 4421 for (i = 0; i < IN6_ADDR_HSIZE; i++) { 4422 restart: 4423 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[i], addr_lst) { 4424 unsigned long age; 4425 4426 /* When setting preferred_lft to a value not zero or 4427 * infinity, while valid_lft is infinity 4428 * IFA_F_PERMANENT has a non-infinity life time. 4429 */ 4430 if ((ifp->flags & IFA_F_PERMANENT) && 4431 (ifp->prefered_lft == INFINITY_LIFE_TIME)) 4432 continue; 4433 4434 spin_lock(&ifp->lock); 4435 /* We try to batch several events at once. */ 4436 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ; 4437 4438 if (ifp->valid_lft != INFINITY_LIFE_TIME && 4439 age >= ifp->valid_lft) { 4440 spin_unlock(&ifp->lock); 4441 in6_ifa_hold(ifp); 4442 ipv6_del_addr(ifp); 4443 goto restart; 4444 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) { 4445 spin_unlock(&ifp->lock); 4446 continue; 4447 } else if (age >= ifp->prefered_lft) { 4448 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */ 4449 int deprecate = 0; 4450 4451 if (!(ifp->flags&IFA_F_DEPRECATED)) { 4452 deprecate = 1; 4453 ifp->flags |= IFA_F_DEPRECATED; 4454 } 4455 4456 if ((ifp->valid_lft != INFINITY_LIFE_TIME) && 4457 (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))) 4458 next = ifp->tstamp + ifp->valid_lft * HZ; 4459 4460 spin_unlock(&ifp->lock); 4461 4462 if (deprecate) { 4463 in6_ifa_hold(ifp); 4464 4465 ipv6_ifa_notify(0, ifp); 4466 in6_ifa_put(ifp); 4467 goto restart; 4468 } 4469 } else if ((ifp->flags&IFA_F_TEMPORARY) && 4470 !(ifp->flags&IFA_F_TENTATIVE)) { 4471 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry * 4472 ifp->idev->cnf.dad_transmits * 4473 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME) / HZ; 4474 4475 if (age >= ifp->prefered_lft - regen_advance) { 4476 struct inet6_ifaddr *ifpub = ifp->ifpub; 4477 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 4478 next = ifp->tstamp + ifp->prefered_lft * HZ; 4479 if (!ifp->regen_count && ifpub) { 4480 ifp->regen_count++; 4481 in6_ifa_hold(ifp); 4482 in6_ifa_hold(ifpub); 4483 spin_unlock(&ifp->lock); 4484 4485 spin_lock(&ifpub->lock); 4486 ifpub->regen_count = 0; 4487 spin_unlock(&ifpub->lock); 4488 rcu_read_unlock_bh(); 4489 ipv6_create_tempaddr(ifpub, ifp, true); 4490 in6_ifa_put(ifpub); 4491 in6_ifa_put(ifp); 4492 rcu_read_lock_bh(); 4493 goto restart; 4494 } 4495 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next)) 4496 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ; 4497 spin_unlock(&ifp->lock); 4498 } else { 4499 /* ifp->prefered_lft <= ifp->valid_lft */ 4500 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 4501 next = ifp->tstamp + ifp->prefered_lft * HZ; 4502 spin_unlock(&ifp->lock); 4503 } 4504 } 4505 } 4506 4507 next_sec = round_jiffies_up(next); 4508 next_sched = next; 4509 4510 /* If rounded timeout is accurate enough, accept it. */ 4511 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ)) 4512 next_sched = next_sec; 4513 4514 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */ 4515 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX)) 4516 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX; 4517 4518 pr_debug("now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n", 4519 now, next, next_sec, next_sched); 4520 mod_delayed_work(addrconf_wq, &addr_chk_work, next_sched - now); 4521 rcu_read_unlock_bh(); 4522 } 4523 4524 static void addrconf_verify_work(struct work_struct *w) 4525 { 4526 rtnl_lock(); 4527 addrconf_verify_rtnl(); 4528 rtnl_unlock(); 4529 } 4530 4531 static void addrconf_verify(void) 4532 { 4533 mod_delayed_work(addrconf_wq, &addr_chk_work, 0); 4534 } 4535 4536 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local, 4537 struct in6_addr **peer_pfx) 4538 { 4539 struct in6_addr *pfx = NULL; 4540 4541 *peer_pfx = NULL; 4542 4543 if (addr) 4544 pfx = nla_data(addr); 4545 4546 if (local) { 4547 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx))) 4548 *peer_pfx = pfx; 4549 pfx = nla_data(local); 4550 } 4551 4552 return pfx; 4553 } 4554 4555 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = { 4556 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) }, 4557 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) }, 4558 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) }, 4559 [IFA_FLAGS] = { .len = sizeof(u32) }, 4560 [IFA_RT_PRIORITY] = { .len = sizeof(u32) }, 4561 [IFA_TARGET_NETNSID] = { .type = NLA_S32 }, 4562 }; 4563 4564 static int 4565 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, 4566 struct netlink_ext_ack *extack) 4567 { 4568 struct net *net = sock_net(skb->sk); 4569 struct ifaddrmsg *ifm; 4570 struct nlattr *tb[IFA_MAX+1]; 4571 struct in6_addr *pfx, *peer_pfx; 4572 u32 ifa_flags; 4573 int err; 4574 4575 err = nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX, 4576 ifa_ipv6_policy, extack); 4577 if (err < 0) 4578 return err; 4579 4580 ifm = nlmsg_data(nlh); 4581 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx); 4582 if (!pfx) 4583 return -EINVAL; 4584 4585 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags; 4586 4587 /* We ignore other flags so far. */ 4588 ifa_flags &= IFA_F_MANAGETEMPADDR; 4589 4590 return inet6_addr_del(net, ifm->ifa_index, ifa_flags, pfx, 4591 ifm->ifa_prefixlen); 4592 } 4593 4594 static int modify_prefix_route(struct inet6_ifaddr *ifp, 4595 unsigned long expires, u32 flags, 4596 bool modify_peer) 4597 { 4598 struct fib6_info *f6i; 4599 u32 prio; 4600 4601 f6i = addrconf_get_prefix_route(modify_peer ? &ifp->peer_addr : &ifp->addr, 4602 ifp->prefix_len, 4603 ifp->idev->dev, 0, RTF_DEFAULT, true); 4604 if (!f6i) 4605 return -ENOENT; 4606 4607 prio = ifp->rt_priority ? : IP6_RT_PRIO_ADDRCONF; 4608 if (f6i->fib6_metric != prio) { 4609 /* delete old one */ 4610 ip6_del_rt(dev_net(ifp->idev->dev), f6i); 4611 4612 /* add new one */ 4613 addrconf_prefix_route(modify_peer ? &ifp->peer_addr : &ifp->addr, 4614 ifp->prefix_len, 4615 ifp->rt_priority, ifp->idev->dev, 4616 expires, flags, GFP_KERNEL); 4617 } else { 4618 if (!expires) 4619 fib6_clean_expires(f6i); 4620 else 4621 fib6_set_expires(f6i, expires); 4622 4623 fib6_info_release(f6i); 4624 } 4625 4626 return 0; 4627 } 4628 4629 static int inet6_addr_modify(struct inet6_ifaddr *ifp, struct ifa6_config *cfg) 4630 { 4631 u32 flags; 4632 clock_t expires; 4633 unsigned long timeout; 4634 bool was_managetempaddr; 4635 bool had_prefixroute; 4636 bool new_peer = false; 4637 4638 ASSERT_RTNL(); 4639 4640 if (!cfg->valid_lft || cfg->preferred_lft > cfg->valid_lft) 4641 return -EINVAL; 4642 4643 if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR && 4644 (ifp->flags & IFA_F_TEMPORARY || ifp->prefix_len != 64)) 4645 return -EINVAL; 4646 4647 if (!(ifp->flags & IFA_F_TENTATIVE) || ifp->flags & IFA_F_DADFAILED) 4648 cfg->ifa_flags &= ~IFA_F_OPTIMISTIC; 4649 4650 timeout = addrconf_timeout_fixup(cfg->valid_lft, HZ); 4651 if (addrconf_finite_timeout(timeout)) { 4652 expires = jiffies_to_clock_t(timeout * HZ); 4653 cfg->valid_lft = timeout; 4654 flags = RTF_EXPIRES; 4655 } else { 4656 expires = 0; 4657 flags = 0; 4658 cfg->ifa_flags |= IFA_F_PERMANENT; 4659 } 4660 4661 timeout = addrconf_timeout_fixup(cfg->preferred_lft, HZ); 4662 if (addrconf_finite_timeout(timeout)) { 4663 if (timeout == 0) 4664 cfg->ifa_flags |= IFA_F_DEPRECATED; 4665 cfg->preferred_lft = timeout; 4666 } 4667 4668 if (cfg->peer_pfx && 4669 memcmp(&ifp->peer_addr, cfg->peer_pfx, sizeof(struct in6_addr))) { 4670 if (!ipv6_addr_any(&ifp->peer_addr)) 4671 cleanup_prefix_route(ifp, expires, true, true); 4672 new_peer = true; 4673 } 4674 4675 spin_lock_bh(&ifp->lock); 4676 was_managetempaddr = ifp->flags & IFA_F_MANAGETEMPADDR; 4677 had_prefixroute = ifp->flags & IFA_F_PERMANENT && 4678 !(ifp->flags & IFA_F_NOPREFIXROUTE); 4679 ifp->flags &= ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | 4680 IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR | 4681 IFA_F_NOPREFIXROUTE); 4682 ifp->flags |= cfg->ifa_flags; 4683 ifp->tstamp = jiffies; 4684 ifp->valid_lft = cfg->valid_lft; 4685 ifp->prefered_lft = cfg->preferred_lft; 4686 4687 if (cfg->rt_priority && cfg->rt_priority != ifp->rt_priority) 4688 ifp->rt_priority = cfg->rt_priority; 4689 4690 if (new_peer) 4691 ifp->peer_addr = *cfg->peer_pfx; 4692 4693 spin_unlock_bh(&ifp->lock); 4694 if (!(ifp->flags&IFA_F_TENTATIVE)) 4695 ipv6_ifa_notify(0, ifp); 4696 4697 if (!(cfg->ifa_flags & IFA_F_NOPREFIXROUTE)) { 4698 int rc = -ENOENT; 4699 4700 if (had_prefixroute) 4701 rc = modify_prefix_route(ifp, expires, flags, false); 4702 4703 /* prefix route could have been deleted; if so restore it */ 4704 if (rc == -ENOENT) { 4705 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, 4706 ifp->rt_priority, ifp->idev->dev, 4707 expires, flags, GFP_KERNEL); 4708 } 4709 4710 if (had_prefixroute && !ipv6_addr_any(&ifp->peer_addr)) 4711 rc = modify_prefix_route(ifp, expires, flags, true); 4712 4713 if (rc == -ENOENT && !ipv6_addr_any(&ifp->peer_addr)) { 4714 addrconf_prefix_route(&ifp->peer_addr, ifp->prefix_len, 4715 ifp->rt_priority, ifp->idev->dev, 4716 expires, flags, GFP_KERNEL); 4717 } 4718 } else if (had_prefixroute) { 4719 enum cleanup_prefix_rt_t action; 4720 unsigned long rt_expires; 4721 4722 write_lock_bh(&ifp->idev->lock); 4723 action = check_cleanup_prefix_route(ifp, &rt_expires); 4724 write_unlock_bh(&ifp->idev->lock); 4725 4726 if (action != CLEANUP_PREFIX_RT_NOP) { 4727 cleanup_prefix_route(ifp, rt_expires, 4728 action == CLEANUP_PREFIX_RT_DEL, false); 4729 } 4730 } 4731 4732 if (was_managetempaddr || ifp->flags & IFA_F_MANAGETEMPADDR) { 4733 if (was_managetempaddr && 4734 !(ifp->flags & IFA_F_MANAGETEMPADDR)) { 4735 cfg->valid_lft = 0; 4736 cfg->preferred_lft = 0; 4737 } 4738 manage_tempaddrs(ifp->idev, ifp, cfg->valid_lft, 4739 cfg->preferred_lft, !was_managetempaddr, 4740 jiffies); 4741 } 4742 4743 addrconf_verify_rtnl(); 4744 4745 return 0; 4746 } 4747 4748 static int 4749 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, 4750 struct netlink_ext_ack *extack) 4751 { 4752 struct net *net = sock_net(skb->sk); 4753 struct ifaddrmsg *ifm; 4754 struct nlattr *tb[IFA_MAX+1]; 4755 struct in6_addr *peer_pfx; 4756 struct inet6_ifaddr *ifa; 4757 struct net_device *dev; 4758 struct inet6_dev *idev; 4759 struct ifa6_config cfg; 4760 int err; 4761 4762 err = nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX, 4763 ifa_ipv6_policy, extack); 4764 if (err < 0) 4765 return err; 4766 4767 memset(&cfg, 0, sizeof(cfg)); 4768 4769 ifm = nlmsg_data(nlh); 4770 cfg.pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx); 4771 if (!cfg.pfx) 4772 return -EINVAL; 4773 4774 cfg.peer_pfx = peer_pfx; 4775 cfg.plen = ifm->ifa_prefixlen; 4776 if (tb[IFA_RT_PRIORITY]) 4777 cfg.rt_priority = nla_get_u32(tb[IFA_RT_PRIORITY]); 4778 4779 cfg.valid_lft = INFINITY_LIFE_TIME; 4780 cfg.preferred_lft = INFINITY_LIFE_TIME; 4781 4782 if (tb[IFA_CACHEINFO]) { 4783 struct ifa_cacheinfo *ci; 4784 4785 ci = nla_data(tb[IFA_CACHEINFO]); 4786 cfg.valid_lft = ci->ifa_valid; 4787 cfg.preferred_lft = ci->ifa_prefered; 4788 } 4789 4790 dev = __dev_get_by_index(net, ifm->ifa_index); 4791 if (!dev) 4792 return -ENODEV; 4793 4794 if (tb[IFA_FLAGS]) 4795 cfg.ifa_flags = nla_get_u32(tb[IFA_FLAGS]); 4796 else 4797 cfg.ifa_flags = ifm->ifa_flags; 4798 4799 /* We ignore other flags so far. */ 4800 cfg.ifa_flags &= IFA_F_NODAD | IFA_F_HOMEADDRESS | 4801 IFA_F_MANAGETEMPADDR | IFA_F_NOPREFIXROUTE | 4802 IFA_F_MCAUTOJOIN | IFA_F_OPTIMISTIC; 4803 4804 idev = ipv6_find_idev(dev); 4805 if (IS_ERR(idev)) 4806 return PTR_ERR(idev); 4807 4808 if (!ipv6_allow_optimistic_dad(net, idev)) 4809 cfg.ifa_flags &= ~IFA_F_OPTIMISTIC; 4810 4811 if (cfg.ifa_flags & IFA_F_NODAD && 4812 cfg.ifa_flags & IFA_F_OPTIMISTIC) { 4813 NL_SET_ERR_MSG(extack, "IFA_F_NODAD and IFA_F_OPTIMISTIC are mutually exclusive"); 4814 return -EINVAL; 4815 } 4816 4817 ifa = ipv6_get_ifaddr(net, cfg.pfx, dev, 1); 4818 if (!ifa) { 4819 /* 4820 * It would be best to check for !NLM_F_CREATE here but 4821 * userspace already relies on not having to provide this. 4822 */ 4823 return inet6_addr_add(net, ifm->ifa_index, &cfg, extack); 4824 } 4825 4826 if (nlh->nlmsg_flags & NLM_F_EXCL || 4827 !(nlh->nlmsg_flags & NLM_F_REPLACE)) 4828 err = -EEXIST; 4829 else 4830 err = inet6_addr_modify(ifa, &cfg); 4831 4832 in6_ifa_put(ifa); 4833 4834 return err; 4835 } 4836 4837 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u32 flags, 4838 u8 scope, int ifindex) 4839 { 4840 struct ifaddrmsg *ifm; 4841 4842 ifm = nlmsg_data(nlh); 4843 ifm->ifa_family = AF_INET6; 4844 ifm->ifa_prefixlen = prefixlen; 4845 ifm->ifa_flags = flags; 4846 ifm->ifa_scope = scope; 4847 ifm->ifa_index = ifindex; 4848 } 4849 4850 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp, 4851 unsigned long tstamp, u32 preferred, u32 valid) 4852 { 4853 struct ifa_cacheinfo ci; 4854 4855 ci.cstamp = cstamp_delta(cstamp); 4856 ci.tstamp = cstamp_delta(tstamp); 4857 ci.ifa_prefered = preferred; 4858 ci.ifa_valid = valid; 4859 4860 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci); 4861 } 4862 4863 static inline int rt_scope(int ifa_scope) 4864 { 4865 if (ifa_scope & IFA_HOST) 4866 return RT_SCOPE_HOST; 4867 else if (ifa_scope & IFA_LINK) 4868 return RT_SCOPE_LINK; 4869 else if (ifa_scope & IFA_SITE) 4870 return RT_SCOPE_SITE; 4871 else 4872 return RT_SCOPE_UNIVERSE; 4873 } 4874 4875 static inline int inet6_ifaddr_msgsize(void) 4876 { 4877 return NLMSG_ALIGN(sizeof(struct ifaddrmsg)) 4878 + nla_total_size(16) /* IFA_LOCAL */ 4879 + nla_total_size(16) /* IFA_ADDRESS */ 4880 + nla_total_size(sizeof(struct ifa_cacheinfo)) 4881 + nla_total_size(4) /* IFA_FLAGS */ 4882 + nla_total_size(4) /* IFA_RT_PRIORITY */; 4883 } 4884 4885 enum addr_type_t { 4886 UNICAST_ADDR, 4887 MULTICAST_ADDR, 4888 ANYCAST_ADDR, 4889 }; 4890 4891 struct inet6_fill_args { 4892 u32 portid; 4893 u32 seq; 4894 int event; 4895 unsigned int flags; 4896 int netnsid; 4897 int ifindex; 4898 enum addr_type_t type; 4899 }; 4900 4901 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa, 4902 struct inet6_fill_args *args) 4903 { 4904 struct nlmsghdr *nlh; 4905 u32 preferred, valid; 4906 4907 nlh = nlmsg_put(skb, args->portid, args->seq, args->event, 4908 sizeof(struct ifaddrmsg), args->flags); 4909 if (!nlh) 4910 return -EMSGSIZE; 4911 4912 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope), 4913 ifa->idev->dev->ifindex); 4914 4915 if (args->netnsid >= 0 && 4916 nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid)) 4917 goto error; 4918 4919 if (!((ifa->flags&IFA_F_PERMANENT) && 4920 (ifa->prefered_lft == INFINITY_LIFE_TIME))) { 4921 preferred = ifa->prefered_lft; 4922 valid = ifa->valid_lft; 4923 if (preferred != INFINITY_LIFE_TIME) { 4924 long tval = (jiffies - ifa->tstamp)/HZ; 4925 if (preferred > tval) 4926 preferred -= tval; 4927 else 4928 preferred = 0; 4929 if (valid != INFINITY_LIFE_TIME) { 4930 if (valid > tval) 4931 valid -= tval; 4932 else 4933 valid = 0; 4934 } 4935 } 4936 } else { 4937 preferred = INFINITY_LIFE_TIME; 4938 valid = INFINITY_LIFE_TIME; 4939 } 4940 4941 if (!ipv6_addr_any(&ifa->peer_addr)) { 4942 if (nla_put_in6_addr(skb, IFA_LOCAL, &ifa->addr) < 0 || 4943 nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->peer_addr) < 0) 4944 goto error; 4945 } else 4946 if (nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->addr) < 0) 4947 goto error; 4948 4949 if (ifa->rt_priority && 4950 nla_put_u32(skb, IFA_RT_PRIORITY, ifa->rt_priority)) 4951 goto error; 4952 4953 if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) 4954 goto error; 4955 4956 if (nla_put_u32(skb, IFA_FLAGS, ifa->flags) < 0) 4957 goto error; 4958 4959 nlmsg_end(skb, nlh); 4960 return 0; 4961 4962 error: 4963 nlmsg_cancel(skb, nlh); 4964 return -EMSGSIZE; 4965 } 4966 4967 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca, 4968 struct inet6_fill_args *args) 4969 { 4970 struct nlmsghdr *nlh; 4971 u8 scope = RT_SCOPE_UNIVERSE; 4972 int ifindex = ifmca->idev->dev->ifindex; 4973 4974 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE) 4975 scope = RT_SCOPE_SITE; 4976 4977 nlh = nlmsg_put(skb, args->portid, args->seq, args->event, 4978 sizeof(struct ifaddrmsg), args->flags); 4979 if (!nlh) 4980 return -EMSGSIZE; 4981 4982 if (args->netnsid >= 0 && 4983 nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid)) 4984 return -EMSGSIZE; 4985 4986 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 4987 if (nla_put_in6_addr(skb, IFA_MULTICAST, &ifmca->mca_addr) < 0 || 4988 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp, 4989 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 4990 nlmsg_cancel(skb, nlh); 4991 return -EMSGSIZE; 4992 } 4993 4994 nlmsg_end(skb, nlh); 4995 return 0; 4996 } 4997 4998 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca, 4999 struct inet6_fill_args *args) 5000 { 5001 struct net_device *dev = fib6_info_nh_dev(ifaca->aca_rt); 5002 int ifindex = dev ? dev->ifindex : 1; 5003 struct nlmsghdr *nlh; 5004 u8 scope = RT_SCOPE_UNIVERSE; 5005 5006 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE) 5007 scope = RT_SCOPE_SITE; 5008 5009 nlh = nlmsg_put(skb, args->portid, args->seq, args->event, 5010 sizeof(struct ifaddrmsg), args->flags); 5011 if (!nlh) 5012 return -EMSGSIZE; 5013 5014 if (args->netnsid >= 0 && 5015 nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid)) 5016 return -EMSGSIZE; 5017 5018 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 5019 if (nla_put_in6_addr(skb, IFA_ANYCAST, &ifaca->aca_addr) < 0 || 5020 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp, 5021 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 5022 nlmsg_cancel(skb, nlh); 5023 return -EMSGSIZE; 5024 } 5025 5026 nlmsg_end(skb, nlh); 5027 return 0; 5028 } 5029 5030 /* called with rcu_read_lock() */ 5031 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb, 5032 struct netlink_callback *cb, int s_ip_idx, 5033 struct inet6_fill_args *fillargs) 5034 { 5035 struct ifmcaddr6 *ifmca; 5036 struct ifacaddr6 *ifaca; 5037 int ip_idx = 0; 5038 int err = 1; 5039 5040 read_lock_bh(&idev->lock); 5041 switch (fillargs->type) { 5042 case UNICAST_ADDR: { 5043 struct inet6_ifaddr *ifa; 5044 fillargs->event = RTM_NEWADDR; 5045 5046 /* unicast address incl. temp addr */ 5047 list_for_each_entry(ifa, &idev->addr_list, if_list) { 5048 if (ip_idx < s_ip_idx) 5049 goto next; 5050 err = inet6_fill_ifaddr(skb, ifa, fillargs); 5051 if (err < 0) 5052 break; 5053 nl_dump_check_consistent(cb, nlmsg_hdr(skb)); 5054 next: 5055 ip_idx++; 5056 } 5057 break; 5058 } 5059 case MULTICAST_ADDR: 5060 fillargs->event = RTM_GETMULTICAST; 5061 5062 /* multicast address */ 5063 for (ifmca = idev->mc_list; ifmca; 5064 ifmca = ifmca->next, ip_idx++) { 5065 if (ip_idx < s_ip_idx) 5066 continue; 5067 err = inet6_fill_ifmcaddr(skb, ifmca, fillargs); 5068 if (err < 0) 5069 break; 5070 } 5071 break; 5072 case ANYCAST_ADDR: 5073 fillargs->event = RTM_GETANYCAST; 5074 /* anycast address */ 5075 for (ifaca = idev->ac_list; ifaca; 5076 ifaca = ifaca->aca_next, ip_idx++) { 5077 if (ip_idx < s_ip_idx) 5078 continue; 5079 err = inet6_fill_ifacaddr(skb, ifaca, fillargs); 5080 if (err < 0) 5081 break; 5082 } 5083 break; 5084 default: 5085 break; 5086 } 5087 read_unlock_bh(&idev->lock); 5088 cb->args[2] = ip_idx; 5089 return err; 5090 } 5091 5092 static int inet6_valid_dump_ifaddr_req(const struct nlmsghdr *nlh, 5093 struct inet6_fill_args *fillargs, 5094 struct net **tgt_net, struct sock *sk, 5095 struct netlink_callback *cb) 5096 { 5097 struct netlink_ext_ack *extack = cb->extack; 5098 struct nlattr *tb[IFA_MAX+1]; 5099 struct ifaddrmsg *ifm; 5100 int err, i; 5101 5102 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) { 5103 NL_SET_ERR_MSG_MOD(extack, "Invalid header for address dump request"); 5104 return -EINVAL; 5105 } 5106 5107 ifm = nlmsg_data(nlh); 5108 if (ifm->ifa_prefixlen || ifm->ifa_flags || ifm->ifa_scope) { 5109 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for address dump request"); 5110 return -EINVAL; 5111 } 5112 5113 fillargs->ifindex = ifm->ifa_index; 5114 if (fillargs->ifindex) { 5115 cb->answer_flags |= NLM_F_DUMP_FILTERED; 5116 fillargs->flags |= NLM_F_DUMP_FILTERED; 5117 } 5118 5119 err = nlmsg_parse_deprecated_strict(nlh, sizeof(*ifm), tb, IFA_MAX, 5120 ifa_ipv6_policy, extack); 5121 if (err < 0) 5122 return err; 5123 5124 for (i = 0; i <= IFA_MAX; ++i) { 5125 if (!tb[i]) 5126 continue; 5127 5128 if (i == IFA_TARGET_NETNSID) { 5129 struct net *net; 5130 5131 fillargs->netnsid = nla_get_s32(tb[i]); 5132 net = rtnl_get_net_ns_capable(sk, fillargs->netnsid); 5133 if (IS_ERR(net)) { 5134 fillargs->netnsid = -1; 5135 NL_SET_ERR_MSG_MOD(extack, "Invalid target network namespace id"); 5136 return PTR_ERR(net); 5137 } 5138 *tgt_net = net; 5139 } else { 5140 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in dump request"); 5141 return -EINVAL; 5142 } 5143 } 5144 5145 return 0; 5146 } 5147 5148 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb, 5149 enum addr_type_t type) 5150 { 5151 const struct nlmsghdr *nlh = cb->nlh; 5152 struct inet6_fill_args fillargs = { 5153 .portid = NETLINK_CB(cb->skb).portid, 5154 .seq = cb->nlh->nlmsg_seq, 5155 .flags = NLM_F_MULTI, 5156 .netnsid = -1, 5157 .type = type, 5158 }; 5159 struct net *net = sock_net(skb->sk); 5160 struct net *tgt_net = net; 5161 int idx, s_idx, s_ip_idx; 5162 int h, s_h; 5163 struct net_device *dev; 5164 struct inet6_dev *idev; 5165 struct hlist_head *head; 5166 int err = 0; 5167 5168 s_h = cb->args[0]; 5169 s_idx = idx = cb->args[1]; 5170 s_ip_idx = cb->args[2]; 5171 5172 if (cb->strict_check) { 5173 err = inet6_valid_dump_ifaddr_req(nlh, &fillargs, &tgt_net, 5174 skb->sk, cb); 5175 if (err < 0) 5176 goto put_tgt_net; 5177 5178 err = 0; 5179 if (fillargs.ifindex) { 5180 dev = __dev_get_by_index(tgt_net, fillargs.ifindex); 5181 if (!dev) { 5182 err = -ENODEV; 5183 goto put_tgt_net; 5184 } 5185 idev = __in6_dev_get(dev); 5186 if (idev) { 5187 err = in6_dump_addrs(idev, skb, cb, s_ip_idx, 5188 &fillargs); 5189 if (err > 0) 5190 err = 0; 5191 } 5192 goto put_tgt_net; 5193 } 5194 } 5195 5196 rcu_read_lock(); 5197 cb->seq = atomic_read(&tgt_net->ipv6.dev_addr_genid) ^ tgt_net->dev_base_seq; 5198 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 5199 idx = 0; 5200 head = &tgt_net->dev_index_head[h]; 5201 hlist_for_each_entry_rcu(dev, head, index_hlist) { 5202 if (idx < s_idx) 5203 goto cont; 5204 if (h > s_h || idx > s_idx) 5205 s_ip_idx = 0; 5206 idev = __in6_dev_get(dev); 5207 if (!idev) 5208 goto cont; 5209 5210 if (in6_dump_addrs(idev, skb, cb, s_ip_idx, 5211 &fillargs) < 0) 5212 goto done; 5213 cont: 5214 idx++; 5215 } 5216 } 5217 done: 5218 rcu_read_unlock(); 5219 cb->args[0] = h; 5220 cb->args[1] = idx; 5221 put_tgt_net: 5222 if (fillargs.netnsid >= 0) 5223 put_net(tgt_net); 5224 5225 return skb->len ? : err; 5226 } 5227 5228 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb) 5229 { 5230 enum addr_type_t type = UNICAST_ADDR; 5231 5232 return inet6_dump_addr(skb, cb, type); 5233 } 5234 5235 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb) 5236 { 5237 enum addr_type_t type = MULTICAST_ADDR; 5238 5239 return inet6_dump_addr(skb, cb, type); 5240 } 5241 5242 5243 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb) 5244 { 5245 enum addr_type_t type = ANYCAST_ADDR; 5246 5247 return inet6_dump_addr(skb, cb, type); 5248 } 5249 5250 static int inet6_rtm_valid_getaddr_req(struct sk_buff *skb, 5251 const struct nlmsghdr *nlh, 5252 struct nlattr **tb, 5253 struct netlink_ext_ack *extack) 5254 { 5255 struct ifaddrmsg *ifm; 5256 int i, err; 5257 5258 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) { 5259 NL_SET_ERR_MSG_MOD(extack, "Invalid header for get address request"); 5260 return -EINVAL; 5261 } 5262 5263 if (!netlink_strict_get_check(skb)) 5264 return nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX, 5265 ifa_ipv6_policy, extack); 5266 5267 ifm = nlmsg_data(nlh); 5268 if (ifm->ifa_prefixlen || ifm->ifa_flags || ifm->ifa_scope) { 5269 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for get address request"); 5270 return -EINVAL; 5271 } 5272 5273 err = nlmsg_parse_deprecated_strict(nlh, sizeof(*ifm), tb, IFA_MAX, 5274 ifa_ipv6_policy, extack); 5275 if (err) 5276 return err; 5277 5278 for (i = 0; i <= IFA_MAX; i++) { 5279 if (!tb[i]) 5280 continue; 5281 5282 switch (i) { 5283 case IFA_TARGET_NETNSID: 5284 case IFA_ADDRESS: 5285 case IFA_LOCAL: 5286 break; 5287 default: 5288 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in get address request"); 5289 return -EINVAL; 5290 } 5291 } 5292 5293 return 0; 5294 } 5295 5296 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh, 5297 struct netlink_ext_ack *extack) 5298 { 5299 struct net *net = sock_net(in_skb->sk); 5300 struct inet6_fill_args fillargs = { 5301 .portid = NETLINK_CB(in_skb).portid, 5302 .seq = nlh->nlmsg_seq, 5303 .event = RTM_NEWADDR, 5304 .flags = 0, 5305 .netnsid = -1, 5306 }; 5307 struct net *tgt_net = net; 5308 struct ifaddrmsg *ifm; 5309 struct nlattr *tb[IFA_MAX+1]; 5310 struct in6_addr *addr = NULL, *peer; 5311 struct net_device *dev = NULL; 5312 struct inet6_ifaddr *ifa; 5313 struct sk_buff *skb; 5314 int err; 5315 5316 err = inet6_rtm_valid_getaddr_req(in_skb, nlh, tb, extack); 5317 if (err < 0) 5318 return err; 5319 5320 if (tb[IFA_TARGET_NETNSID]) { 5321 fillargs.netnsid = nla_get_s32(tb[IFA_TARGET_NETNSID]); 5322 5323 tgt_net = rtnl_get_net_ns_capable(NETLINK_CB(in_skb).sk, 5324 fillargs.netnsid); 5325 if (IS_ERR(tgt_net)) 5326 return PTR_ERR(tgt_net); 5327 } 5328 5329 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer); 5330 if (!addr) 5331 return -EINVAL; 5332 5333 ifm = nlmsg_data(nlh); 5334 if (ifm->ifa_index) 5335 dev = dev_get_by_index(tgt_net, ifm->ifa_index); 5336 5337 ifa = ipv6_get_ifaddr(tgt_net, addr, dev, 1); 5338 if (!ifa) { 5339 err = -EADDRNOTAVAIL; 5340 goto errout; 5341 } 5342 5343 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL); 5344 if (!skb) { 5345 err = -ENOBUFS; 5346 goto errout_ifa; 5347 } 5348 5349 err = inet6_fill_ifaddr(skb, ifa, &fillargs); 5350 if (err < 0) { 5351 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 5352 WARN_ON(err == -EMSGSIZE); 5353 kfree_skb(skb); 5354 goto errout_ifa; 5355 } 5356 err = rtnl_unicast(skb, tgt_net, NETLINK_CB(in_skb).portid); 5357 errout_ifa: 5358 in6_ifa_put(ifa); 5359 errout: 5360 if (dev) 5361 dev_put(dev); 5362 if (fillargs.netnsid >= 0) 5363 put_net(tgt_net); 5364 5365 return err; 5366 } 5367 5368 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa) 5369 { 5370 struct sk_buff *skb; 5371 struct net *net = dev_net(ifa->idev->dev); 5372 struct inet6_fill_args fillargs = { 5373 .portid = 0, 5374 .seq = 0, 5375 .event = event, 5376 .flags = 0, 5377 .netnsid = -1, 5378 }; 5379 int err = -ENOBUFS; 5380 5381 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC); 5382 if (!skb) 5383 goto errout; 5384 5385 err = inet6_fill_ifaddr(skb, ifa, &fillargs); 5386 if (err < 0) { 5387 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 5388 WARN_ON(err == -EMSGSIZE); 5389 kfree_skb(skb); 5390 goto errout; 5391 } 5392 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC); 5393 return; 5394 errout: 5395 if (err < 0) 5396 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err); 5397 } 5398 5399 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf, 5400 __s32 *array, int bytes) 5401 { 5402 BUG_ON(bytes < (DEVCONF_MAX * 4)); 5403 5404 memset(array, 0, bytes); 5405 array[DEVCONF_FORWARDING] = cnf->forwarding; 5406 array[DEVCONF_HOPLIMIT] = cnf->hop_limit; 5407 array[DEVCONF_MTU6] = cnf->mtu6; 5408 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra; 5409 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects; 5410 array[DEVCONF_AUTOCONF] = cnf->autoconf; 5411 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits; 5412 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits; 5413 array[DEVCONF_RTR_SOLICIT_INTERVAL] = 5414 jiffies_to_msecs(cnf->rtr_solicit_interval); 5415 array[DEVCONF_RTR_SOLICIT_MAX_INTERVAL] = 5416 jiffies_to_msecs(cnf->rtr_solicit_max_interval); 5417 array[DEVCONF_RTR_SOLICIT_DELAY] = 5418 jiffies_to_msecs(cnf->rtr_solicit_delay); 5419 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version; 5420 array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] = 5421 jiffies_to_msecs(cnf->mldv1_unsolicited_report_interval); 5422 array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] = 5423 jiffies_to_msecs(cnf->mldv2_unsolicited_report_interval); 5424 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr; 5425 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft; 5426 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft; 5427 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry; 5428 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor; 5429 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses; 5430 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr; 5431 array[DEVCONF_ACCEPT_RA_MIN_HOP_LIMIT] = cnf->accept_ra_min_hop_limit; 5432 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo; 5433 #ifdef CONFIG_IPV6_ROUTER_PREF 5434 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref; 5435 array[DEVCONF_RTR_PROBE_INTERVAL] = 5436 jiffies_to_msecs(cnf->rtr_probe_interval); 5437 #ifdef CONFIG_IPV6_ROUTE_INFO 5438 array[DEVCONF_ACCEPT_RA_RT_INFO_MIN_PLEN] = cnf->accept_ra_rt_info_min_plen; 5439 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen; 5440 #endif 5441 #endif 5442 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp; 5443 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route; 5444 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 5445 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad; 5446 array[DEVCONF_USE_OPTIMISTIC] = cnf->use_optimistic; 5447 #endif 5448 #ifdef CONFIG_IPV6_MROUTE 5449 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding; 5450 #endif 5451 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6; 5452 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad; 5453 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao; 5454 array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify; 5455 array[DEVCONF_SUPPRESS_FRAG_NDISC] = cnf->suppress_frag_ndisc; 5456 array[DEVCONF_ACCEPT_RA_FROM_LOCAL] = cnf->accept_ra_from_local; 5457 array[DEVCONF_ACCEPT_RA_MTU] = cnf->accept_ra_mtu; 5458 array[DEVCONF_IGNORE_ROUTES_WITH_LINKDOWN] = cnf->ignore_routes_with_linkdown; 5459 /* we omit DEVCONF_STABLE_SECRET for now */ 5460 array[DEVCONF_USE_OIF_ADDRS_ONLY] = cnf->use_oif_addrs_only; 5461 array[DEVCONF_DROP_UNICAST_IN_L2_MULTICAST] = cnf->drop_unicast_in_l2_multicast; 5462 array[DEVCONF_DROP_UNSOLICITED_NA] = cnf->drop_unsolicited_na; 5463 array[DEVCONF_KEEP_ADDR_ON_DOWN] = cnf->keep_addr_on_down; 5464 array[DEVCONF_SEG6_ENABLED] = cnf->seg6_enabled; 5465 #ifdef CONFIG_IPV6_SEG6_HMAC 5466 array[DEVCONF_SEG6_REQUIRE_HMAC] = cnf->seg6_require_hmac; 5467 #endif 5468 array[DEVCONF_ENHANCED_DAD] = cnf->enhanced_dad; 5469 array[DEVCONF_ADDR_GEN_MODE] = cnf->addr_gen_mode; 5470 array[DEVCONF_DISABLE_POLICY] = cnf->disable_policy; 5471 array[DEVCONF_NDISC_TCLASS] = cnf->ndisc_tclass; 5472 } 5473 5474 static inline size_t inet6_ifla6_size(void) 5475 { 5476 return nla_total_size(4) /* IFLA_INET6_FLAGS */ 5477 + nla_total_size(sizeof(struct ifla_cacheinfo)) 5478 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */ 5479 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */ 5480 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */ 5481 + nla_total_size(sizeof(struct in6_addr)) /* IFLA_INET6_TOKEN */ 5482 + nla_total_size(1) /* IFLA_INET6_ADDR_GEN_MODE */ 5483 + 0; 5484 } 5485 5486 static inline size_t inet6_if_nlmsg_size(void) 5487 { 5488 return NLMSG_ALIGN(sizeof(struct ifinfomsg)) 5489 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */ 5490 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */ 5491 + nla_total_size(4) /* IFLA_MTU */ 5492 + nla_total_size(4) /* IFLA_LINK */ 5493 + nla_total_size(1) /* IFLA_OPERSTATE */ 5494 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */ 5495 } 5496 5497 static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib, 5498 int bytes) 5499 { 5500 int i; 5501 int pad = bytes - sizeof(u64) * ICMP6_MIB_MAX; 5502 BUG_ON(pad < 0); 5503 5504 /* Use put_unaligned() because stats may not be aligned for u64. */ 5505 put_unaligned(ICMP6_MIB_MAX, &stats[0]); 5506 for (i = 1; i < ICMP6_MIB_MAX; i++) 5507 put_unaligned(atomic_long_read(&mib[i]), &stats[i]); 5508 5509 memset(&stats[ICMP6_MIB_MAX], 0, pad); 5510 } 5511 5512 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu *mib, 5513 int bytes, size_t syncpoff) 5514 { 5515 int i, c; 5516 u64 buff[IPSTATS_MIB_MAX]; 5517 int pad = bytes - sizeof(u64) * IPSTATS_MIB_MAX; 5518 5519 BUG_ON(pad < 0); 5520 5521 memset(buff, 0, sizeof(buff)); 5522 buff[0] = IPSTATS_MIB_MAX; 5523 5524 for_each_possible_cpu(c) { 5525 for (i = 1; i < IPSTATS_MIB_MAX; i++) 5526 buff[i] += snmp_get_cpu_field64(mib, c, i, syncpoff); 5527 } 5528 5529 memcpy(stats, buff, IPSTATS_MIB_MAX * sizeof(u64)); 5530 memset(&stats[IPSTATS_MIB_MAX], 0, pad); 5531 } 5532 5533 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype, 5534 int bytes) 5535 { 5536 switch (attrtype) { 5537 case IFLA_INET6_STATS: 5538 __snmp6_fill_stats64(stats, idev->stats.ipv6, bytes, 5539 offsetof(struct ipstats_mib, syncp)); 5540 break; 5541 case IFLA_INET6_ICMP6STATS: 5542 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, bytes); 5543 break; 5544 } 5545 } 5546 5547 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev, 5548 u32 ext_filter_mask) 5549 { 5550 struct nlattr *nla; 5551 struct ifla_cacheinfo ci; 5552 5553 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags)) 5554 goto nla_put_failure; 5555 ci.max_reasm_len = IPV6_MAXPLEN; 5556 ci.tstamp = cstamp_delta(idev->tstamp); 5557 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time); 5558 ci.retrans_time = jiffies_to_msecs(NEIGH_VAR(idev->nd_parms, RETRANS_TIME)); 5559 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci)) 5560 goto nla_put_failure; 5561 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32)); 5562 if (!nla) 5563 goto nla_put_failure; 5564 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla)); 5565 5566 /* XXX - MC not implemented */ 5567 5568 if (ext_filter_mask & RTEXT_FILTER_SKIP_STATS) 5569 return 0; 5570 5571 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64)); 5572 if (!nla) 5573 goto nla_put_failure; 5574 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla)); 5575 5576 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64)); 5577 if (!nla) 5578 goto nla_put_failure; 5579 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla)); 5580 5581 nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr)); 5582 if (!nla) 5583 goto nla_put_failure; 5584 read_lock_bh(&idev->lock); 5585 memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla)); 5586 read_unlock_bh(&idev->lock); 5587 5588 if (nla_put_u8(skb, IFLA_INET6_ADDR_GEN_MODE, idev->cnf.addr_gen_mode)) 5589 goto nla_put_failure; 5590 5591 return 0; 5592 5593 nla_put_failure: 5594 return -EMSGSIZE; 5595 } 5596 5597 static size_t inet6_get_link_af_size(const struct net_device *dev, 5598 u32 ext_filter_mask) 5599 { 5600 if (!__in6_dev_get(dev)) 5601 return 0; 5602 5603 return inet6_ifla6_size(); 5604 } 5605 5606 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev, 5607 u32 ext_filter_mask) 5608 { 5609 struct inet6_dev *idev = __in6_dev_get(dev); 5610 5611 if (!idev) 5612 return -ENODATA; 5613 5614 if (inet6_fill_ifla6_attrs(skb, idev, ext_filter_mask) < 0) 5615 return -EMSGSIZE; 5616 5617 return 0; 5618 } 5619 5620 static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token) 5621 { 5622 struct inet6_ifaddr *ifp; 5623 struct net_device *dev = idev->dev; 5624 bool clear_token, update_rs = false; 5625 struct in6_addr ll_addr; 5626 5627 ASSERT_RTNL(); 5628 5629 if (!token) 5630 return -EINVAL; 5631 if (dev->flags & (IFF_LOOPBACK | IFF_NOARP)) 5632 return -EINVAL; 5633 if (!ipv6_accept_ra(idev)) 5634 return -EINVAL; 5635 if (idev->cnf.rtr_solicits == 0) 5636 return -EINVAL; 5637 5638 write_lock_bh(&idev->lock); 5639 5640 BUILD_BUG_ON(sizeof(token->s6_addr) != 16); 5641 memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8); 5642 5643 write_unlock_bh(&idev->lock); 5644 5645 clear_token = ipv6_addr_any(token); 5646 if (clear_token) 5647 goto update_lft; 5648 5649 if (!idev->dead && (idev->if_flags & IF_READY) && 5650 !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE | 5651 IFA_F_OPTIMISTIC)) { 5652 /* If we're not ready, then normal ifup will take care 5653 * of this. Otherwise, we need to request our rs here. 5654 */ 5655 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters); 5656 update_rs = true; 5657 } 5658 5659 update_lft: 5660 write_lock_bh(&idev->lock); 5661 5662 if (update_rs) { 5663 idev->if_flags |= IF_RS_SENT; 5664 idev->rs_interval = rfc3315_s14_backoff_init( 5665 idev->cnf.rtr_solicit_interval); 5666 idev->rs_probes = 1; 5667 addrconf_mod_rs_timer(idev, idev->rs_interval); 5668 } 5669 5670 /* Well, that's kinda nasty ... */ 5671 list_for_each_entry(ifp, &idev->addr_list, if_list) { 5672 spin_lock(&ifp->lock); 5673 if (ifp->tokenized) { 5674 ifp->valid_lft = 0; 5675 ifp->prefered_lft = 0; 5676 } 5677 spin_unlock(&ifp->lock); 5678 } 5679 5680 write_unlock_bh(&idev->lock); 5681 inet6_ifinfo_notify(RTM_NEWLINK, idev); 5682 addrconf_verify_rtnl(); 5683 return 0; 5684 } 5685 5686 static const struct nla_policy inet6_af_policy[IFLA_INET6_MAX + 1] = { 5687 [IFLA_INET6_ADDR_GEN_MODE] = { .type = NLA_U8 }, 5688 [IFLA_INET6_TOKEN] = { .len = sizeof(struct in6_addr) }, 5689 }; 5690 5691 static int check_addr_gen_mode(int mode) 5692 { 5693 if (mode != IN6_ADDR_GEN_MODE_EUI64 && 5694 mode != IN6_ADDR_GEN_MODE_NONE && 5695 mode != IN6_ADDR_GEN_MODE_STABLE_PRIVACY && 5696 mode != IN6_ADDR_GEN_MODE_RANDOM) 5697 return -EINVAL; 5698 return 1; 5699 } 5700 5701 static int check_stable_privacy(struct inet6_dev *idev, struct net *net, 5702 int mode) 5703 { 5704 if (mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY && 5705 !idev->cnf.stable_secret.initialized && 5706 !net->ipv6.devconf_dflt->stable_secret.initialized) 5707 return -EINVAL; 5708 return 1; 5709 } 5710 5711 static int inet6_validate_link_af(const struct net_device *dev, 5712 const struct nlattr *nla) 5713 { 5714 struct nlattr *tb[IFLA_INET6_MAX + 1]; 5715 struct inet6_dev *idev = NULL; 5716 int err; 5717 5718 if (dev) { 5719 idev = __in6_dev_get(dev); 5720 if (!idev) 5721 return -EAFNOSUPPORT; 5722 } 5723 5724 err = nla_parse_nested_deprecated(tb, IFLA_INET6_MAX, nla, 5725 inet6_af_policy, NULL); 5726 if (err) 5727 return err; 5728 5729 if (!tb[IFLA_INET6_TOKEN] && !tb[IFLA_INET6_ADDR_GEN_MODE]) 5730 return -EINVAL; 5731 5732 if (tb[IFLA_INET6_ADDR_GEN_MODE]) { 5733 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]); 5734 5735 if (check_addr_gen_mode(mode) < 0) 5736 return -EINVAL; 5737 if (dev && check_stable_privacy(idev, dev_net(dev), mode) < 0) 5738 return -EINVAL; 5739 } 5740 5741 return 0; 5742 } 5743 5744 static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla) 5745 { 5746 struct inet6_dev *idev = __in6_dev_get(dev); 5747 struct nlattr *tb[IFLA_INET6_MAX + 1]; 5748 int err; 5749 5750 if (!idev) 5751 return -EAFNOSUPPORT; 5752 5753 if (nla_parse_nested_deprecated(tb, IFLA_INET6_MAX, nla, NULL, NULL) < 0) 5754 BUG(); 5755 5756 if (tb[IFLA_INET6_TOKEN]) { 5757 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN])); 5758 if (err) 5759 return err; 5760 } 5761 5762 if (tb[IFLA_INET6_ADDR_GEN_MODE]) { 5763 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]); 5764 5765 idev->cnf.addr_gen_mode = mode; 5766 } 5767 5768 return 0; 5769 } 5770 5771 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev, 5772 u32 portid, u32 seq, int event, unsigned int flags) 5773 { 5774 struct net_device *dev = idev->dev; 5775 struct ifinfomsg *hdr; 5776 struct nlmsghdr *nlh; 5777 void *protoinfo; 5778 5779 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags); 5780 if (!nlh) 5781 return -EMSGSIZE; 5782 5783 hdr = nlmsg_data(nlh); 5784 hdr->ifi_family = AF_INET6; 5785 hdr->__ifi_pad = 0; 5786 hdr->ifi_type = dev->type; 5787 hdr->ifi_index = dev->ifindex; 5788 hdr->ifi_flags = dev_get_flags(dev); 5789 hdr->ifi_change = 0; 5790 5791 if (nla_put_string(skb, IFLA_IFNAME, dev->name) || 5792 (dev->addr_len && 5793 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) || 5794 nla_put_u32(skb, IFLA_MTU, dev->mtu) || 5795 (dev->ifindex != dev_get_iflink(dev) && 5796 nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))) || 5797 nla_put_u8(skb, IFLA_OPERSTATE, 5798 netif_running(dev) ? dev->operstate : IF_OPER_DOWN)) 5799 goto nla_put_failure; 5800 protoinfo = nla_nest_start_noflag(skb, IFLA_PROTINFO); 5801 if (!protoinfo) 5802 goto nla_put_failure; 5803 5804 if (inet6_fill_ifla6_attrs(skb, idev, 0) < 0) 5805 goto nla_put_failure; 5806 5807 nla_nest_end(skb, protoinfo); 5808 nlmsg_end(skb, nlh); 5809 return 0; 5810 5811 nla_put_failure: 5812 nlmsg_cancel(skb, nlh); 5813 return -EMSGSIZE; 5814 } 5815 5816 static int inet6_valid_dump_ifinfo(const struct nlmsghdr *nlh, 5817 struct netlink_ext_ack *extack) 5818 { 5819 struct ifinfomsg *ifm; 5820 5821 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) { 5822 NL_SET_ERR_MSG_MOD(extack, "Invalid header for link dump request"); 5823 return -EINVAL; 5824 } 5825 5826 if (nlmsg_attrlen(nlh, sizeof(*ifm))) { 5827 NL_SET_ERR_MSG_MOD(extack, "Invalid data after header"); 5828 return -EINVAL; 5829 } 5830 5831 ifm = nlmsg_data(nlh); 5832 if (ifm->__ifi_pad || ifm->ifi_type || ifm->ifi_flags || 5833 ifm->ifi_change || ifm->ifi_index) { 5834 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for dump request"); 5835 return -EINVAL; 5836 } 5837 5838 return 0; 5839 } 5840 5841 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb) 5842 { 5843 struct net *net = sock_net(skb->sk); 5844 int h, s_h; 5845 int idx = 0, s_idx; 5846 struct net_device *dev; 5847 struct inet6_dev *idev; 5848 struct hlist_head *head; 5849 5850 /* only requests using strict checking can pass data to 5851 * influence the dump 5852 */ 5853 if (cb->strict_check) { 5854 int err = inet6_valid_dump_ifinfo(cb->nlh, cb->extack); 5855 5856 if (err < 0) 5857 return err; 5858 } 5859 5860 s_h = cb->args[0]; 5861 s_idx = cb->args[1]; 5862 5863 rcu_read_lock(); 5864 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 5865 idx = 0; 5866 head = &net->dev_index_head[h]; 5867 hlist_for_each_entry_rcu(dev, head, index_hlist) { 5868 if (idx < s_idx) 5869 goto cont; 5870 idev = __in6_dev_get(dev); 5871 if (!idev) 5872 goto cont; 5873 if (inet6_fill_ifinfo(skb, idev, 5874 NETLINK_CB(cb->skb).portid, 5875 cb->nlh->nlmsg_seq, 5876 RTM_NEWLINK, NLM_F_MULTI) < 0) 5877 goto out; 5878 cont: 5879 idx++; 5880 } 5881 } 5882 out: 5883 rcu_read_unlock(); 5884 cb->args[1] = idx; 5885 cb->args[0] = h; 5886 5887 return skb->len; 5888 } 5889 5890 void inet6_ifinfo_notify(int event, struct inet6_dev *idev) 5891 { 5892 struct sk_buff *skb; 5893 struct net *net = dev_net(idev->dev); 5894 int err = -ENOBUFS; 5895 5896 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC); 5897 if (!skb) 5898 goto errout; 5899 5900 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0); 5901 if (err < 0) { 5902 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */ 5903 WARN_ON(err == -EMSGSIZE); 5904 kfree_skb(skb); 5905 goto errout; 5906 } 5907 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC); 5908 return; 5909 errout: 5910 if (err < 0) 5911 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err); 5912 } 5913 5914 static inline size_t inet6_prefix_nlmsg_size(void) 5915 { 5916 return NLMSG_ALIGN(sizeof(struct prefixmsg)) 5917 + nla_total_size(sizeof(struct in6_addr)) 5918 + nla_total_size(sizeof(struct prefix_cacheinfo)); 5919 } 5920 5921 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev, 5922 struct prefix_info *pinfo, u32 portid, u32 seq, 5923 int event, unsigned int flags) 5924 { 5925 struct prefixmsg *pmsg; 5926 struct nlmsghdr *nlh; 5927 struct prefix_cacheinfo ci; 5928 5929 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags); 5930 if (!nlh) 5931 return -EMSGSIZE; 5932 5933 pmsg = nlmsg_data(nlh); 5934 pmsg->prefix_family = AF_INET6; 5935 pmsg->prefix_pad1 = 0; 5936 pmsg->prefix_pad2 = 0; 5937 pmsg->prefix_ifindex = idev->dev->ifindex; 5938 pmsg->prefix_len = pinfo->prefix_len; 5939 pmsg->prefix_type = pinfo->type; 5940 pmsg->prefix_pad3 = 0; 5941 pmsg->prefix_flags = 0; 5942 if (pinfo->onlink) 5943 pmsg->prefix_flags |= IF_PREFIX_ONLINK; 5944 if (pinfo->autoconf) 5945 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF; 5946 5947 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix)) 5948 goto nla_put_failure; 5949 ci.preferred_time = ntohl(pinfo->prefered); 5950 ci.valid_time = ntohl(pinfo->valid); 5951 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci)) 5952 goto nla_put_failure; 5953 nlmsg_end(skb, nlh); 5954 return 0; 5955 5956 nla_put_failure: 5957 nlmsg_cancel(skb, nlh); 5958 return -EMSGSIZE; 5959 } 5960 5961 static void inet6_prefix_notify(int event, struct inet6_dev *idev, 5962 struct prefix_info *pinfo) 5963 { 5964 struct sk_buff *skb; 5965 struct net *net = dev_net(idev->dev); 5966 int err = -ENOBUFS; 5967 5968 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC); 5969 if (!skb) 5970 goto errout; 5971 5972 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0); 5973 if (err < 0) { 5974 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */ 5975 WARN_ON(err == -EMSGSIZE); 5976 kfree_skb(skb); 5977 goto errout; 5978 } 5979 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC); 5980 return; 5981 errout: 5982 if (err < 0) 5983 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err); 5984 } 5985 5986 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 5987 { 5988 struct net *net = dev_net(ifp->idev->dev); 5989 5990 if (event) 5991 ASSERT_RTNL(); 5992 5993 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp); 5994 5995 switch (event) { 5996 case RTM_NEWADDR: 5997 /* 5998 * If the address was optimistic we inserted the route at the 5999 * start of our DAD process, so we don't need to do it again. 6000 * If the device was taken down in the middle of the DAD 6001 * cycle there is a race where we could get here without a 6002 * host route, so nothing to insert. That will be fixed when 6003 * the device is brought up. 6004 */ 6005 if (ifp->rt && !rcu_access_pointer(ifp->rt->fib6_node)) { 6006 ip6_ins_rt(net, ifp->rt); 6007 } else if (!ifp->rt && (ifp->idev->dev->flags & IFF_UP)) { 6008 pr_warn("BUG: Address %pI6c on device %s is missing its host route.\n", 6009 &ifp->addr, ifp->idev->dev->name); 6010 } 6011 6012 if (ifp->idev->cnf.forwarding) 6013 addrconf_join_anycast(ifp); 6014 if (!ipv6_addr_any(&ifp->peer_addr)) 6015 addrconf_prefix_route(&ifp->peer_addr, 128, 6016 ifp->rt_priority, ifp->idev->dev, 6017 0, 0, GFP_ATOMIC); 6018 break; 6019 case RTM_DELADDR: 6020 if (ifp->idev->cnf.forwarding) 6021 addrconf_leave_anycast(ifp); 6022 addrconf_leave_solict(ifp->idev, &ifp->addr); 6023 if (!ipv6_addr_any(&ifp->peer_addr)) { 6024 struct fib6_info *rt; 6025 6026 rt = addrconf_get_prefix_route(&ifp->peer_addr, 128, 6027 ifp->idev->dev, 0, 0, 6028 false); 6029 if (rt) 6030 ip6_del_rt(net, rt); 6031 } 6032 if (ifp->rt) { 6033 ip6_del_rt(net, ifp->rt); 6034 ifp->rt = NULL; 6035 } 6036 rt_genid_bump_ipv6(net); 6037 break; 6038 } 6039 atomic_inc(&net->ipv6.dev_addr_genid); 6040 } 6041 6042 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 6043 { 6044 rcu_read_lock_bh(); 6045 if (likely(ifp->idev->dead == 0)) 6046 __ipv6_ifa_notify(event, ifp); 6047 rcu_read_unlock_bh(); 6048 } 6049 6050 #ifdef CONFIG_SYSCTL 6051 6052 static 6053 int addrconf_sysctl_forward(struct ctl_table *ctl, int write, 6054 void __user *buffer, size_t *lenp, loff_t *ppos) 6055 { 6056 int *valp = ctl->data; 6057 int val = *valp; 6058 loff_t pos = *ppos; 6059 struct ctl_table lctl; 6060 int ret; 6061 6062 /* 6063 * ctl->data points to idev->cnf.forwarding, we should 6064 * not modify it until we get the rtnl lock. 6065 */ 6066 lctl = *ctl; 6067 lctl.data = &val; 6068 6069 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 6070 6071 if (write) 6072 ret = addrconf_fixup_forwarding(ctl, valp, val); 6073 if (ret) 6074 *ppos = pos; 6075 return ret; 6076 } 6077 6078 static 6079 int addrconf_sysctl_mtu(struct ctl_table *ctl, int write, 6080 void __user *buffer, size_t *lenp, loff_t *ppos) 6081 { 6082 struct inet6_dev *idev = ctl->extra1; 6083 int min_mtu = IPV6_MIN_MTU; 6084 struct ctl_table lctl; 6085 6086 lctl = *ctl; 6087 lctl.extra1 = &min_mtu; 6088 lctl.extra2 = idev ? &idev->dev->mtu : NULL; 6089 6090 return proc_dointvec_minmax(&lctl, write, buffer, lenp, ppos); 6091 } 6092 6093 static void dev_disable_change(struct inet6_dev *idev) 6094 { 6095 struct netdev_notifier_info info; 6096 6097 if (!idev || !idev->dev) 6098 return; 6099 6100 netdev_notifier_info_init(&info, idev->dev); 6101 if (idev->cnf.disable_ipv6) 6102 addrconf_notify(NULL, NETDEV_DOWN, &info); 6103 else 6104 addrconf_notify(NULL, NETDEV_UP, &info); 6105 } 6106 6107 static void addrconf_disable_change(struct net *net, __s32 newf) 6108 { 6109 struct net_device *dev; 6110 struct inet6_dev *idev; 6111 6112 for_each_netdev(net, dev) { 6113 idev = __in6_dev_get(dev); 6114 if (idev) { 6115 int changed = (!idev->cnf.disable_ipv6) ^ (!newf); 6116 idev->cnf.disable_ipv6 = newf; 6117 if (changed) 6118 dev_disable_change(idev); 6119 } 6120 } 6121 } 6122 6123 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf) 6124 { 6125 struct net *net; 6126 int old; 6127 6128 if (!rtnl_trylock()) 6129 return restart_syscall(); 6130 6131 net = (struct net *)table->extra2; 6132 old = *p; 6133 *p = newf; 6134 6135 if (p == &net->ipv6.devconf_dflt->disable_ipv6) { 6136 rtnl_unlock(); 6137 return 0; 6138 } 6139 6140 if (p == &net->ipv6.devconf_all->disable_ipv6) { 6141 net->ipv6.devconf_dflt->disable_ipv6 = newf; 6142 addrconf_disable_change(net, newf); 6143 } else if ((!newf) ^ (!old)) 6144 dev_disable_change((struct inet6_dev *)table->extra1); 6145 6146 rtnl_unlock(); 6147 return 0; 6148 } 6149 6150 static 6151 int addrconf_sysctl_disable(struct ctl_table *ctl, int write, 6152 void __user *buffer, size_t *lenp, loff_t *ppos) 6153 { 6154 int *valp = ctl->data; 6155 int val = *valp; 6156 loff_t pos = *ppos; 6157 struct ctl_table lctl; 6158 int ret; 6159 6160 /* 6161 * ctl->data points to idev->cnf.disable_ipv6, we should 6162 * not modify it until we get the rtnl lock. 6163 */ 6164 lctl = *ctl; 6165 lctl.data = &val; 6166 6167 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 6168 6169 if (write) 6170 ret = addrconf_disable_ipv6(ctl, valp, val); 6171 if (ret) 6172 *ppos = pos; 6173 return ret; 6174 } 6175 6176 static 6177 int addrconf_sysctl_proxy_ndp(struct ctl_table *ctl, int write, 6178 void __user *buffer, size_t *lenp, loff_t *ppos) 6179 { 6180 int *valp = ctl->data; 6181 int ret; 6182 int old, new; 6183 6184 old = *valp; 6185 ret = proc_dointvec(ctl, write, buffer, lenp, ppos); 6186 new = *valp; 6187 6188 if (write && old != new) { 6189 struct net *net = ctl->extra2; 6190 6191 if (!rtnl_trylock()) 6192 return restart_syscall(); 6193 6194 if (valp == &net->ipv6.devconf_dflt->proxy_ndp) 6195 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 6196 NETCONFA_PROXY_NEIGH, 6197 NETCONFA_IFINDEX_DEFAULT, 6198 net->ipv6.devconf_dflt); 6199 else if (valp == &net->ipv6.devconf_all->proxy_ndp) 6200 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 6201 NETCONFA_PROXY_NEIGH, 6202 NETCONFA_IFINDEX_ALL, 6203 net->ipv6.devconf_all); 6204 else { 6205 struct inet6_dev *idev = ctl->extra1; 6206 6207 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 6208 NETCONFA_PROXY_NEIGH, 6209 idev->dev->ifindex, 6210 &idev->cnf); 6211 } 6212 rtnl_unlock(); 6213 } 6214 6215 return ret; 6216 } 6217 6218 static int addrconf_sysctl_addr_gen_mode(struct ctl_table *ctl, int write, 6219 void __user *buffer, size_t *lenp, 6220 loff_t *ppos) 6221 { 6222 int ret = 0; 6223 u32 new_val; 6224 struct inet6_dev *idev = (struct inet6_dev *)ctl->extra1; 6225 struct net *net = (struct net *)ctl->extra2; 6226 struct ctl_table tmp = { 6227 .data = &new_val, 6228 .maxlen = sizeof(new_val), 6229 .mode = ctl->mode, 6230 }; 6231 6232 if (!rtnl_trylock()) 6233 return restart_syscall(); 6234 6235 new_val = *((u32 *)ctl->data); 6236 6237 ret = proc_douintvec(&tmp, write, buffer, lenp, ppos); 6238 if (ret != 0) 6239 goto out; 6240 6241 if (write) { 6242 if (check_addr_gen_mode(new_val) < 0) { 6243 ret = -EINVAL; 6244 goto out; 6245 } 6246 6247 if (idev) { 6248 if (check_stable_privacy(idev, net, new_val) < 0) { 6249 ret = -EINVAL; 6250 goto out; 6251 } 6252 6253 if (idev->cnf.addr_gen_mode != new_val) { 6254 idev->cnf.addr_gen_mode = new_val; 6255 addrconf_dev_config(idev->dev); 6256 } 6257 } else if (&net->ipv6.devconf_all->addr_gen_mode == ctl->data) { 6258 struct net_device *dev; 6259 6260 net->ipv6.devconf_dflt->addr_gen_mode = new_val; 6261 for_each_netdev(net, dev) { 6262 idev = __in6_dev_get(dev); 6263 if (idev && 6264 idev->cnf.addr_gen_mode != new_val) { 6265 idev->cnf.addr_gen_mode = new_val; 6266 addrconf_dev_config(idev->dev); 6267 } 6268 } 6269 } 6270 6271 *((u32 *)ctl->data) = new_val; 6272 } 6273 6274 out: 6275 rtnl_unlock(); 6276 6277 return ret; 6278 } 6279 6280 static int addrconf_sysctl_stable_secret(struct ctl_table *ctl, int write, 6281 void __user *buffer, size_t *lenp, 6282 loff_t *ppos) 6283 { 6284 int err; 6285 struct in6_addr addr; 6286 char str[IPV6_MAX_STRLEN]; 6287 struct ctl_table lctl = *ctl; 6288 struct net *net = ctl->extra2; 6289 struct ipv6_stable_secret *secret = ctl->data; 6290 6291 if (&net->ipv6.devconf_all->stable_secret == ctl->data) 6292 return -EIO; 6293 6294 lctl.maxlen = IPV6_MAX_STRLEN; 6295 lctl.data = str; 6296 6297 if (!rtnl_trylock()) 6298 return restart_syscall(); 6299 6300 if (!write && !secret->initialized) { 6301 err = -EIO; 6302 goto out; 6303 } 6304 6305 err = snprintf(str, sizeof(str), "%pI6", &secret->secret); 6306 if (err >= sizeof(str)) { 6307 err = -EIO; 6308 goto out; 6309 } 6310 6311 err = proc_dostring(&lctl, write, buffer, lenp, ppos); 6312 if (err || !write) 6313 goto out; 6314 6315 if (in6_pton(str, -1, addr.in6_u.u6_addr8, -1, NULL) != 1) { 6316 err = -EIO; 6317 goto out; 6318 } 6319 6320 secret->initialized = true; 6321 secret->secret = addr; 6322 6323 if (&net->ipv6.devconf_dflt->stable_secret == ctl->data) { 6324 struct net_device *dev; 6325 6326 for_each_netdev(net, dev) { 6327 struct inet6_dev *idev = __in6_dev_get(dev); 6328 6329 if (idev) { 6330 idev->cnf.addr_gen_mode = 6331 IN6_ADDR_GEN_MODE_STABLE_PRIVACY; 6332 } 6333 } 6334 } else { 6335 struct inet6_dev *idev = ctl->extra1; 6336 6337 idev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY; 6338 } 6339 6340 out: 6341 rtnl_unlock(); 6342 6343 return err; 6344 } 6345 6346 static 6347 int addrconf_sysctl_ignore_routes_with_linkdown(struct ctl_table *ctl, 6348 int write, 6349 void __user *buffer, 6350 size_t *lenp, 6351 loff_t *ppos) 6352 { 6353 int *valp = ctl->data; 6354 int val = *valp; 6355 loff_t pos = *ppos; 6356 struct ctl_table lctl; 6357 int ret; 6358 6359 /* ctl->data points to idev->cnf.ignore_routes_when_linkdown 6360 * we should not modify it until we get the rtnl lock. 6361 */ 6362 lctl = *ctl; 6363 lctl.data = &val; 6364 6365 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 6366 6367 if (write) 6368 ret = addrconf_fixup_linkdown(ctl, valp, val); 6369 if (ret) 6370 *ppos = pos; 6371 return ret; 6372 } 6373 6374 static 6375 void addrconf_set_nopolicy(struct rt6_info *rt, int action) 6376 { 6377 if (rt) { 6378 if (action) 6379 rt->dst.flags |= DST_NOPOLICY; 6380 else 6381 rt->dst.flags &= ~DST_NOPOLICY; 6382 } 6383 } 6384 6385 static 6386 void addrconf_disable_policy_idev(struct inet6_dev *idev, int val) 6387 { 6388 struct inet6_ifaddr *ifa; 6389 6390 read_lock_bh(&idev->lock); 6391 list_for_each_entry(ifa, &idev->addr_list, if_list) { 6392 spin_lock(&ifa->lock); 6393 if (ifa->rt) { 6394 /* host routes only use builtin fib6_nh */ 6395 struct fib6_nh *nh = ifa->rt->fib6_nh; 6396 int cpu; 6397 6398 rcu_read_lock(); 6399 ifa->rt->dst_nopolicy = val ? true : false; 6400 if (nh->rt6i_pcpu) { 6401 for_each_possible_cpu(cpu) { 6402 struct rt6_info **rtp; 6403 6404 rtp = per_cpu_ptr(nh->rt6i_pcpu, cpu); 6405 addrconf_set_nopolicy(*rtp, val); 6406 } 6407 } 6408 rcu_read_unlock(); 6409 } 6410 spin_unlock(&ifa->lock); 6411 } 6412 read_unlock_bh(&idev->lock); 6413 } 6414 6415 static 6416 int addrconf_disable_policy(struct ctl_table *ctl, int *valp, int val) 6417 { 6418 struct inet6_dev *idev; 6419 struct net *net; 6420 6421 if (!rtnl_trylock()) 6422 return restart_syscall(); 6423 6424 *valp = val; 6425 6426 net = (struct net *)ctl->extra2; 6427 if (valp == &net->ipv6.devconf_dflt->disable_policy) { 6428 rtnl_unlock(); 6429 return 0; 6430 } 6431 6432 if (valp == &net->ipv6.devconf_all->disable_policy) { 6433 struct net_device *dev; 6434 6435 for_each_netdev(net, dev) { 6436 idev = __in6_dev_get(dev); 6437 if (idev) 6438 addrconf_disable_policy_idev(idev, val); 6439 } 6440 } else { 6441 idev = (struct inet6_dev *)ctl->extra1; 6442 addrconf_disable_policy_idev(idev, val); 6443 } 6444 6445 rtnl_unlock(); 6446 return 0; 6447 } 6448 6449 static 6450 int addrconf_sysctl_disable_policy(struct ctl_table *ctl, int write, 6451 void __user *buffer, size_t *lenp, 6452 loff_t *ppos) 6453 { 6454 int *valp = ctl->data; 6455 int val = *valp; 6456 loff_t pos = *ppos; 6457 struct ctl_table lctl; 6458 int ret; 6459 6460 lctl = *ctl; 6461 lctl.data = &val; 6462 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 6463 6464 if (write && (*valp != val)) 6465 ret = addrconf_disable_policy(ctl, valp, val); 6466 6467 if (ret) 6468 *ppos = pos; 6469 6470 return ret; 6471 } 6472 6473 static int minus_one = -1; 6474 static const int two_five_five = 255; 6475 6476 static const struct ctl_table addrconf_sysctl[] = { 6477 { 6478 .procname = "forwarding", 6479 .data = &ipv6_devconf.forwarding, 6480 .maxlen = sizeof(int), 6481 .mode = 0644, 6482 .proc_handler = addrconf_sysctl_forward, 6483 }, 6484 { 6485 .procname = "hop_limit", 6486 .data = &ipv6_devconf.hop_limit, 6487 .maxlen = sizeof(int), 6488 .mode = 0644, 6489 .proc_handler = proc_dointvec_minmax, 6490 .extra1 = (void *)SYSCTL_ONE, 6491 .extra2 = (void *)&two_five_five, 6492 }, 6493 { 6494 .procname = "mtu", 6495 .data = &ipv6_devconf.mtu6, 6496 .maxlen = sizeof(int), 6497 .mode = 0644, 6498 .proc_handler = addrconf_sysctl_mtu, 6499 }, 6500 { 6501 .procname = "accept_ra", 6502 .data = &ipv6_devconf.accept_ra, 6503 .maxlen = sizeof(int), 6504 .mode = 0644, 6505 .proc_handler = proc_dointvec, 6506 }, 6507 { 6508 .procname = "accept_redirects", 6509 .data = &ipv6_devconf.accept_redirects, 6510 .maxlen = sizeof(int), 6511 .mode = 0644, 6512 .proc_handler = proc_dointvec, 6513 }, 6514 { 6515 .procname = "autoconf", 6516 .data = &ipv6_devconf.autoconf, 6517 .maxlen = sizeof(int), 6518 .mode = 0644, 6519 .proc_handler = proc_dointvec, 6520 }, 6521 { 6522 .procname = "dad_transmits", 6523 .data = &ipv6_devconf.dad_transmits, 6524 .maxlen = sizeof(int), 6525 .mode = 0644, 6526 .proc_handler = proc_dointvec, 6527 }, 6528 { 6529 .procname = "router_solicitations", 6530 .data = &ipv6_devconf.rtr_solicits, 6531 .maxlen = sizeof(int), 6532 .mode = 0644, 6533 .proc_handler = proc_dointvec_minmax, 6534 .extra1 = &minus_one, 6535 }, 6536 { 6537 .procname = "router_solicitation_interval", 6538 .data = &ipv6_devconf.rtr_solicit_interval, 6539 .maxlen = sizeof(int), 6540 .mode = 0644, 6541 .proc_handler = proc_dointvec_jiffies, 6542 }, 6543 { 6544 .procname = "router_solicitation_max_interval", 6545 .data = &ipv6_devconf.rtr_solicit_max_interval, 6546 .maxlen = sizeof(int), 6547 .mode = 0644, 6548 .proc_handler = proc_dointvec_jiffies, 6549 }, 6550 { 6551 .procname = "router_solicitation_delay", 6552 .data = &ipv6_devconf.rtr_solicit_delay, 6553 .maxlen = sizeof(int), 6554 .mode = 0644, 6555 .proc_handler = proc_dointvec_jiffies, 6556 }, 6557 { 6558 .procname = "force_mld_version", 6559 .data = &ipv6_devconf.force_mld_version, 6560 .maxlen = sizeof(int), 6561 .mode = 0644, 6562 .proc_handler = proc_dointvec, 6563 }, 6564 { 6565 .procname = "mldv1_unsolicited_report_interval", 6566 .data = 6567 &ipv6_devconf.mldv1_unsolicited_report_interval, 6568 .maxlen = sizeof(int), 6569 .mode = 0644, 6570 .proc_handler = proc_dointvec_ms_jiffies, 6571 }, 6572 { 6573 .procname = "mldv2_unsolicited_report_interval", 6574 .data = 6575 &ipv6_devconf.mldv2_unsolicited_report_interval, 6576 .maxlen = sizeof(int), 6577 .mode = 0644, 6578 .proc_handler = proc_dointvec_ms_jiffies, 6579 }, 6580 { 6581 .procname = "use_tempaddr", 6582 .data = &ipv6_devconf.use_tempaddr, 6583 .maxlen = sizeof(int), 6584 .mode = 0644, 6585 .proc_handler = proc_dointvec, 6586 }, 6587 { 6588 .procname = "temp_valid_lft", 6589 .data = &ipv6_devconf.temp_valid_lft, 6590 .maxlen = sizeof(int), 6591 .mode = 0644, 6592 .proc_handler = proc_dointvec, 6593 }, 6594 { 6595 .procname = "temp_prefered_lft", 6596 .data = &ipv6_devconf.temp_prefered_lft, 6597 .maxlen = sizeof(int), 6598 .mode = 0644, 6599 .proc_handler = proc_dointvec, 6600 }, 6601 { 6602 .procname = "regen_max_retry", 6603 .data = &ipv6_devconf.regen_max_retry, 6604 .maxlen = sizeof(int), 6605 .mode = 0644, 6606 .proc_handler = proc_dointvec, 6607 }, 6608 { 6609 .procname = "max_desync_factor", 6610 .data = &ipv6_devconf.max_desync_factor, 6611 .maxlen = sizeof(int), 6612 .mode = 0644, 6613 .proc_handler = proc_dointvec, 6614 }, 6615 { 6616 .procname = "max_addresses", 6617 .data = &ipv6_devconf.max_addresses, 6618 .maxlen = sizeof(int), 6619 .mode = 0644, 6620 .proc_handler = proc_dointvec, 6621 }, 6622 { 6623 .procname = "accept_ra_defrtr", 6624 .data = &ipv6_devconf.accept_ra_defrtr, 6625 .maxlen = sizeof(int), 6626 .mode = 0644, 6627 .proc_handler = proc_dointvec, 6628 }, 6629 { 6630 .procname = "accept_ra_min_hop_limit", 6631 .data = &ipv6_devconf.accept_ra_min_hop_limit, 6632 .maxlen = sizeof(int), 6633 .mode = 0644, 6634 .proc_handler = proc_dointvec, 6635 }, 6636 { 6637 .procname = "accept_ra_pinfo", 6638 .data = &ipv6_devconf.accept_ra_pinfo, 6639 .maxlen = sizeof(int), 6640 .mode = 0644, 6641 .proc_handler = proc_dointvec, 6642 }, 6643 #ifdef CONFIG_IPV6_ROUTER_PREF 6644 { 6645 .procname = "accept_ra_rtr_pref", 6646 .data = &ipv6_devconf.accept_ra_rtr_pref, 6647 .maxlen = sizeof(int), 6648 .mode = 0644, 6649 .proc_handler = proc_dointvec, 6650 }, 6651 { 6652 .procname = "router_probe_interval", 6653 .data = &ipv6_devconf.rtr_probe_interval, 6654 .maxlen = sizeof(int), 6655 .mode = 0644, 6656 .proc_handler = proc_dointvec_jiffies, 6657 }, 6658 #ifdef CONFIG_IPV6_ROUTE_INFO 6659 { 6660 .procname = "accept_ra_rt_info_min_plen", 6661 .data = &ipv6_devconf.accept_ra_rt_info_min_plen, 6662 .maxlen = sizeof(int), 6663 .mode = 0644, 6664 .proc_handler = proc_dointvec, 6665 }, 6666 { 6667 .procname = "accept_ra_rt_info_max_plen", 6668 .data = &ipv6_devconf.accept_ra_rt_info_max_plen, 6669 .maxlen = sizeof(int), 6670 .mode = 0644, 6671 .proc_handler = proc_dointvec, 6672 }, 6673 #endif 6674 #endif 6675 { 6676 .procname = "proxy_ndp", 6677 .data = &ipv6_devconf.proxy_ndp, 6678 .maxlen = sizeof(int), 6679 .mode = 0644, 6680 .proc_handler = addrconf_sysctl_proxy_ndp, 6681 }, 6682 { 6683 .procname = "accept_source_route", 6684 .data = &ipv6_devconf.accept_source_route, 6685 .maxlen = sizeof(int), 6686 .mode = 0644, 6687 .proc_handler = proc_dointvec, 6688 }, 6689 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 6690 { 6691 .procname = "optimistic_dad", 6692 .data = &ipv6_devconf.optimistic_dad, 6693 .maxlen = sizeof(int), 6694 .mode = 0644, 6695 .proc_handler = proc_dointvec, 6696 }, 6697 { 6698 .procname = "use_optimistic", 6699 .data = &ipv6_devconf.use_optimistic, 6700 .maxlen = sizeof(int), 6701 .mode = 0644, 6702 .proc_handler = proc_dointvec, 6703 }, 6704 #endif 6705 #ifdef CONFIG_IPV6_MROUTE 6706 { 6707 .procname = "mc_forwarding", 6708 .data = &ipv6_devconf.mc_forwarding, 6709 .maxlen = sizeof(int), 6710 .mode = 0444, 6711 .proc_handler = proc_dointvec, 6712 }, 6713 #endif 6714 { 6715 .procname = "disable_ipv6", 6716 .data = &ipv6_devconf.disable_ipv6, 6717 .maxlen = sizeof(int), 6718 .mode = 0644, 6719 .proc_handler = addrconf_sysctl_disable, 6720 }, 6721 { 6722 .procname = "accept_dad", 6723 .data = &ipv6_devconf.accept_dad, 6724 .maxlen = sizeof(int), 6725 .mode = 0644, 6726 .proc_handler = proc_dointvec, 6727 }, 6728 { 6729 .procname = "force_tllao", 6730 .data = &ipv6_devconf.force_tllao, 6731 .maxlen = sizeof(int), 6732 .mode = 0644, 6733 .proc_handler = proc_dointvec 6734 }, 6735 { 6736 .procname = "ndisc_notify", 6737 .data = &ipv6_devconf.ndisc_notify, 6738 .maxlen = sizeof(int), 6739 .mode = 0644, 6740 .proc_handler = proc_dointvec 6741 }, 6742 { 6743 .procname = "suppress_frag_ndisc", 6744 .data = &ipv6_devconf.suppress_frag_ndisc, 6745 .maxlen = sizeof(int), 6746 .mode = 0644, 6747 .proc_handler = proc_dointvec 6748 }, 6749 { 6750 .procname = "accept_ra_from_local", 6751 .data = &ipv6_devconf.accept_ra_from_local, 6752 .maxlen = sizeof(int), 6753 .mode = 0644, 6754 .proc_handler = proc_dointvec, 6755 }, 6756 { 6757 .procname = "accept_ra_mtu", 6758 .data = &ipv6_devconf.accept_ra_mtu, 6759 .maxlen = sizeof(int), 6760 .mode = 0644, 6761 .proc_handler = proc_dointvec, 6762 }, 6763 { 6764 .procname = "stable_secret", 6765 .data = &ipv6_devconf.stable_secret, 6766 .maxlen = IPV6_MAX_STRLEN, 6767 .mode = 0600, 6768 .proc_handler = addrconf_sysctl_stable_secret, 6769 }, 6770 { 6771 .procname = "use_oif_addrs_only", 6772 .data = &ipv6_devconf.use_oif_addrs_only, 6773 .maxlen = sizeof(int), 6774 .mode = 0644, 6775 .proc_handler = proc_dointvec, 6776 }, 6777 { 6778 .procname = "ignore_routes_with_linkdown", 6779 .data = &ipv6_devconf.ignore_routes_with_linkdown, 6780 .maxlen = sizeof(int), 6781 .mode = 0644, 6782 .proc_handler = addrconf_sysctl_ignore_routes_with_linkdown, 6783 }, 6784 { 6785 .procname = "drop_unicast_in_l2_multicast", 6786 .data = &ipv6_devconf.drop_unicast_in_l2_multicast, 6787 .maxlen = sizeof(int), 6788 .mode = 0644, 6789 .proc_handler = proc_dointvec, 6790 }, 6791 { 6792 .procname = "drop_unsolicited_na", 6793 .data = &ipv6_devconf.drop_unsolicited_na, 6794 .maxlen = sizeof(int), 6795 .mode = 0644, 6796 .proc_handler = proc_dointvec, 6797 }, 6798 { 6799 .procname = "keep_addr_on_down", 6800 .data = &ipv6_devconf.keep_addr_on_down, 6801 .maxlen = sizeof(int), 6802 .mode = 0644, 6803 .proc_handler = proc_dointvec, 6804 6805 }, 6806 { 6807 .procname = "seg6_enabled", 6808 .data = &ipv6_devconf.seg6_enabled, 6809 .maxlen = sizeof(int), 6810 .mode = 0644, 6811 .proc_handler = proc_dointvec, 6812 }, 6813 #ifdef CONFIG_IPV6_SEG6_HMAC 6814 { 6815 .procname = "seg6_require_hmac", 6816 .data = &ipv6_devconf.seg6_require_hmac, 6817 .maxlen = sizeof(int), 6818 .mode = 0644, 6819 .proc_handler = proc_dointvec, 6820 }, 6821 #endif 6822 { 6823 .procname = "enhanced_dad", 6824 .data = &ipv6_devconf.enhanced_dad, 6825 .maxlen = sizeof(int), 6826 .mode = 0644, 6827 .proc_handler = proc_dointvec, 6828 }, 6829 { 6830 .procname = "addr_gen_mode", 6831 .data = &ipv6_devconf.addr_gen_mode, 6832 .maxlen = sizeof(int), 6833 .mode = 0644, 6834 .proc_handler = addrconf_sysctl_addr_gen_mode, 6835 }, 6836 { 6837 .procname = "disable_policy", 6838 .data = &ipv6_devconf.disable_policy, 6839 .maxlen = sizeof(int), 6840 .mode = 0644, 6841 .proc_handler = addrconf_sysctl_disable_policy, 6842 }, 6843 { 6844 .procname = "ndisc_tclass", 6845 .data = &ipv6_devconf.ndisc_tclass, 6846 .maxlen = sizeof(int), 6847 .mode = 0644, 6848 .proc_handler = proc_dointvec_minmax, 6849 .extra1 = (void *)SYSCTL_ZERO, 6850 .extra2 = (void *)&two_five_five, 6851 }, 6852 { 6853 /* sentinel */ 6854 } 6855 }; 6856 6857 static int __addrconf_sysctl_register(struct net *net, char *dev_name, 6858 struct inet6_dev *idev, struct ipv6_devconf *p) 6859 { 6860 int i, ifindex; 6861 struct ctl_table *table; 6862 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ]; 6863 6864 table = kmemdup(addrconf_sysctl, sizeof(addrconf_sysctl), GFP_KERNEL); 6865 if (!table) 6866 goto out; 6867 6868 for (i = 0; table[i].data; i++) { 6869 table[i].data += (char *)p - (char *)&ipv6_devconf; 6870 /* If one of these is already set, then it is not safe to 6871 * overwrite either of them: this makes proc_dointvec_minmax 6872 * usable. 6873 */ 6874 if (!table[i].extra1 && !table[i].extra2) { 6875 table[i].extra1 = idev; /* embedded; no ref */ 6876 table[i].extra2 = net; 6877 } 6878 } 6879 6880 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name); 6881 6882 p->sysctl_header = register_net_sysctl(net, path, table); 6883 if (!p->sysctl_header) 6884 goto free; 6885 6886 if (!strcmp(dev_name, "all")) 6887 ifindex = NETCONFA_IFINDEX_ALL; 6888 else if (!strcmp(dev_name, "default")) 6889 ifindex = NETCONFA_IFINDEX_DEFAULT; 6890 else 6891 ifindex = idev->dev->ifindex; 6892 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, NETCONFA_ALL, 6893 ifindex, p); 6894 return 0; 6895 6896 free: 6897 kfree(table); 6898 out: 6899 return -ENOBUFS; 6900 } 6901 6902 static void __addrconf_sysctl_unregister(struct net *net, 6903 struct ipv6_devconf *p, int ifindex) 6904 { 6905 struct ctl_table *table; 6906 6907 if (!p->sysctl_header) 6908 return; 6909 6910 table = p->sysctl_header->ctl_table_arg; 6911 unregister_net_sysctl_table(p->sysctl_header); 6912 p->sysctl_header = NULL; 6913 kfree(table); 6914 6915 inet6_netconf_notify_devconf(net, RTM_DELNETCONF, 0, ifindex, NULL); 6916 } 6917 6918 static int addrconf_sysctl_register(struct inet6_dev *idev) 6919 { 6920 int err; 6921 6922 if (!sysctl_dev_name_is_allowed(idev->dev->name)) 6923 return -EINVAL; 6924 6925 err = neigh_sysctl_register(idev->dev, idev->nd_parms, 6926 &ndisc_ifinfo_sysctl_change); 6927 if (err) 6928 return err; 6929 err = __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name, 6930 idev, &idev->cnf); 6931 if (err) 6932 neigh_sysctl_unregister(idev->nd_parms); 6933 6934 return err; 6935 } 6936 6937 static void addrconf_sysctl_unregister(struct inet6_dev *idev) 6938 { 6939 __addrconf_sysctl_unregister(dev_net(idev->dev), &idev->cnf, 6940 idev->dev->ifindex); 6941 neigh_sysctl_unregister(idev->nd_parms); 6942 } 6943 6944 6945 #endif 6946 6947 static int __net_init addrconf_init_net(struct net *net) 6948 { 6949 int err = -ENOMEM; 6950 struct ipv6_devconf *all, *dflt; 6951 6952 all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL); 6953 if (!all) 6954 goto err_alloc_all; 6955 6956 dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL); 6957 if (!dflt) 6958 goto err_alloc_dflt; 6959 6960 if (IS_ENABLED(CONFIG_SYSCTL) && 6961 sysctl_devconf_inherit_init_net == 1 && !net_eq(net, &init_net)) { 6962 memcpy(all, init_net.ipv6.devconf_all, sizeof(ipv6_devconf)); 6963 memcpy(dflt, init_net.ipv6.devconf_dflt, sizeof(ipv6_devconf_dflt)); 6964 } 6965 6966 /* these will be inherited by all namespaces */ 6967 dflt->autoconf = ipv6_defaults.autoconf; 6968 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6; 6969 6970 dflt->stable_secret.initialized = false; 6971 all->stable_secret.initialized = false; 6972 6973 net->ipv6.devconf_all = all; 6974 net->ipv6.devconf_dflt = dflt; 6975 6976 #ifdef CONFIG_SYSCTL 6977 err = __addrconf_sysctl_register(net, "all", NULL, all); 6978 if (err < 0) 6979 goto err_reg_all; 6980 6981 err = __addrconf_sysctl_register(net, "default", NULL, dflt); 6982 if (err < 0) 6983 goto err_reg_dflt; 6984 #endif 6985 return 0; 6986 6987 #ifdef CONFIG_SYSCTL 6988 err_reg_dflt: 6989 __addrconf_sysctl_unregister(net, all, NETCONFA_IFINDEX_ALL); 6990 err_reg_all: 6991 kfree(dflt); 6992 #endif 6993 err_alloc_dflt: 6994 kfree(all); 6995 err_alloc_all: 6996 return err; 6997 } 6998 6999 static void __net_exit addrconf_exit_net(struct net *net) 7000 { 7001 #ifdef CONFIG_SYSCTL 7002 __addrconf_sysctl_unregister(net, net->ipv6.devconf_dflt, 7003 NETCONFA_IFINDEX_DEFAULT); 7004 __addrconf_sysctl_unregister(net, net->ipv6.devconf_all, 7005 NETCONFA_IFINDEX_ALL); 7006 #endif 7007 kfree(net->ipv6.devconf_dflt); 7008 kfree(net->ipv6.devconf_all); 7009 } 7010 7011 static struct pernet_operations addrconf_ops = { 7012 .init = addrconf_init_net, 7013 .exit = addrconf_exit_net, 7014 }; 7015 7016 static struct rtnl_af_ops inet6_ops __read_mostly = { 7017 .family = AF_INET6, 7018 .fill_link_af = inet6_fill_link_af, 7019 .get_link_af_size = inet6_get_link_af_size, 7020 .validate_link_af = inet6_validate_link_af, 7021 .set_link_af = inet6_set_link_af, 7022 }; 7023 7024 /* 7025 * Init / cleanup code 7026 */ 7027 7028 int __init addrconf_init(void) 7029 { 7030 struct inet6_dev *idev; 7031 int i, err; 7032 7033 err = ipv6_addr_label_init(); 7034 if (err < 0) { 7035 pr_crit("%s: cannot initialize default policy table: %d\n", 7036 __func__, err); 7037 goto out; 7038 } 7039 7040 err = register_pernet_subsys(&addrconf_ops); 7041 if (err < 0) 7042 goto out_addrlabel; 7043 7044 addrconf_wq = create_workqueue("ipv6_addrconf"); 7045 if (!addrconf_wq) { 7046 err = -ENOMEM; 7047 goto out_nowq; 7048 } 7049 7050 /* The addrconf netdev notifier requires that loopback_dev 7051 * has it's ipv6 private information allocated and setup 7052 * before it can bring up and give link-local addresses 7053 * to other devices which are up. 7054 * 7055 * Unfortunately, loopback_dev is not necessarily the first 7056 * entry in the global dev_base list of net devices. In fact, 7057 * it is likely to be the very last entry on that list. 7058 * So this causes the notifier registry below to try and 7059 * give link-local addresses to all devices besides loopback_dev 7060 * first, then loopback_dev, which cases all the non-loopback_dev 7061 * devices to fail to get a link-local address. 7062 * 7063 * So, as a temporary fix, allocate the ipv6 structure for 7064 * loopback_dev first by hand. 7065 * Longer term, all of the dependencies ipv6 has upon the loopback 7066 * device and it being up should be removed. 7067 */ 7068 rtnl_lock(); 7069 idev = ipv6_add_dev(init_net.loopback_dev); 7070 rtnl_unlock(); 7071 if (IS_ERR(idev)) { 7072 err = PTR_ERR(idev); 7073 goto errlo; 7074 } 7075 7076 ip6_route_init_special_entries(); 7077 7078 for (i = 0; i < IN6_ADDR_HSIZE; i++) 7079 INIT_HLIST_HEAD(&inet6_addr_lst[i]); 7080 7081 register_netdevice_notifier(&ipv6_dev_notf); 7082 7083 addrconf_verify(); 7084 7085 rtnl_af_register(&inet6_ops); 7086 7087 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETLINK, 7088 NULL, inet6_dump_ifinfo, 0); 7089 if (err < 0) 7090 goto errout; 7091 7092 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_NEWADDR, 7093 inet6_rtm_newaddr, NULL, 0); 7094 if (err < 0) 7095 goto errout; 7096 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_DELADDR, 7097 inet6_rtm_deladdr, NULL, 0); 7098 if (err < 0) 7099 goto errout; 7100 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETADDR, 7101 inet6_rtm_getaddr, inet6_dump_ifaddr, 7102 RTNL_FLAG_DOIT_UNLOCKED); 7103 if (err < 0) 7104 goto errout; 7105 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETMULTICAST, 7106 NULL, inet6_dump_ifmcaddr, 0); 7107 if (err < 0) 7108 goto errout; 7109 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETANYCAST, 7110 NULL, inet6_dump_ifacaddr, 0); 7111 if (err < 0) 7112 goto errout; 7113 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETNETCONF, 7114 inet6_netconf_get_devconf, 7115 inet6_netconf_dump_devconf, 7116 RTNL_FLAG_DOIT_UNLOCKED); 7117 if (err < 0) 7118 goto errout; 7119 err = ipv6_addr_label_rtnl_register(); 7120 if (err < 0) 7121 goto errout; 7122 7123 return 0; 7124 errout: 7125 rtnl_unregister_all(PF_INET6); 7126 rtnl_af_unregister(&inet6_ops); 7127 unregister_netdevice_notifier(&ipv6_dev_notf); 7128 errlo: 7129 destroy_workqueue(addrconf_wq); 7130 out_nowq: 7131 unregister_pernet_subsys(&addrconf_ops); 7132 out_addrlabel: 7133 ipv6_addr_label_cleanup(); 7134 out: 7135 return err; 7136 } 7137 7138 void addrconf_cleanup(void) 7139 { 7140 struct net_device *dev; 7141 int i; 7142 7143 unregister_netdevice_notifier(&ipv6_dev_notf); 7144 unregister_pernet_subsys(&addrconf_ops); 7145 ipv6_addr_label_cleanup(); 7146 7147 rtnl_af_unregister(&inet6_ops); 7148 7149 rtnl_lock(); 7150 7151 /* clean dev list */ 7152 for_each_netdev(&init_net, dev) { 7153 if (__in6_dev_get(dev) == NULL) 7154 continue; 7155 addrconf_ifdown(dev, 1); 7156 } 7157 addrconf_ifdown(init_net.loopback_dev, 2); 7158 7159 /* 7160 * Check hash table. 7161 */ 7162 spin_lock_bh(&addrconf_hash_lock); 7163 for (i = 0; i < IN6_ADDR_HSIZE; i++) 7164 WARN_ON(!hlist_empty(&inet6_addr_lst[i])); 7165 spin_unlock_bh(&addrconf_hash_lock); 7166 cancel_delayed_work(&addr_chk_work); 7167 rtnl_unlock(); 7168 7169 destroy_workqueue(addrconf_wq); 7170 } 7171