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 fallthrough; 3527 case NETDEV_UP: 3528 case NETDEV_CHANGE: 3529 if (dev->flags & IFF_SLAVE) 3530 break; 3531 3532 if (idev && idev->cnf.disable_ipv6) 3533 break; 3534 3535 if (event == NETDEV_UP) { 3536 /* restore routes for permanent addresses */ 3537 addrconf_permanent_addr(net, dev); 3538 3539 if (!addrconf_link_ready(dev)) { 3540 /* device is not ready yet. */ 3541 pr_debug("ADDRCONF(NETDEV_UP): %s: link is not ready\n", 3542 dev->name); 3543 break; 3544 } 3545 3546 if (!idev && dev->mtu >= IPV6_MIN_MTU) 3547 idev = ipv6_add_dev(dev); 3548 3549 if (!IS_ERR_OR_NULL(idev)) { 3550 idev->if_flags |= IF_READY; 3551 run_pending = 1; 3552 } 3553 } else if (event == NETDEV_CHANGE) { 3554 if (!addrconf_link_ready(dev)) { 3555 /* device is still not ready. */ 3556 rt6_sync_down_dev(dev, event); 3557 break; 3558 } 3559 3560 if (!IS_ERR_OR_NULL(idev)) { 3561 if (idev->if_flags & IF_READY) { 3562 /* device is already configured - 3563 * but resend MLD reports, we might 3564 * have roamed and need to update 3565 * multicast snooping switches 3566 */ 3567 ipv6_mc_up(idev); 3568 change_info = ptr; 3569 if (change_info->flags_changed & IFF_NOARP) 3570 addrconf_dad_run(idev, true); 3571 rt6_sync_up(dev, RTNH_F_LINKDOWN); 3572 break; 3573 } 3574 idev->if_flags |= IF_READY; 3575 } 3576 3577 pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n", 3578 dev->name); 3579 3580 run_pending = 1; 3581 } 3582 3583 switch (dev->type) { 3584 #if IS_ENABLED(CONFIG_IPV6_SIT) 3585 case ARPHRD_SIT: 3586 addrconf_sit_config(dev); 3587 break; 3588 #endif 3589 #if IS_ENABLED(CONFIG_NET_IPGRE) 3590 case ARPHRD_IPGRE: 3591 addrconf_gre_config(dev); 3592 break; 3593 #endif 3594 case ARPHRD_LOOPBACK: 3595 init_loopback(dev); 3596 break; 3597 3598 default: 3599 addrconf_dev_config(dev); 3600 break; 3601 } 3602 3603 if (!IS_ERR_OR_NULL(idev)) { 3604 if (run_pending) 3605 addrconf_dad_run(idev, false); 3606 3607 /* Device has an address by now */ 3608 rt6_sync_up(dev, RTNH_F_DEAD); 3609 3610 /* 3611 * If the MTU changed during the interface down, 3612 * when the interface up, the changed MTU must be 3613 * reflected in the idev as well as routers. 3614 */ 3615 if (idev->cnf.mtu6 != dev->mtu && 3616 dev->mtu >= IPV6_MIN_MTU) { 3617 rt6_mtu_change(dev, dev->mtu); 3618 idev->cnf.mtu6 = dev->mtu; 3619 } 3620 idev->tstamp = jiffies; 3621 inet6_ifinfo_notify(RTM_NEWLINK, idev); 3622 3623 /* 3624 * If the changed mtu during down is lower than 3625 * IPV6_MIN_MTU stop IPv6 on this interface. 3626 */ 3627 if (dev->mtu < IPV6_MIN_MTU) 3628 addrconf_ifdown(dev, dev != net->loopback_dev); 3629 } 3630 break; 3631 3632 case NETDEV_DOWN: 3633 case NETDEV_UNREGISTER: 3634 /* 3635 * Remove all addresses from this interface. 3636 */ 3637 addrconf_ifdown(dev, event != NETDEV_DOWN); 3638 break; 3639 3640 case NETDEV_CHANGENAME: 3641 if (idev) { 3642 snmp6_unregister_dev(idev); 3643 addrconf_sysctl_unregister(idev); 3644 err = addrconf_sysctl_register(idev); 3645 if (err) 3646 return notifier_from_errno(err); 3647 err = snmp6_register_dev(idev); 3648 if (err) { 3649 addrconf_sysctl_unregister(idev); 3650 return notifier_from_errno(err); 3651 } 3652 } 3653 break; 3654 3655 case NETDEV_PRE_TYPE_CHANGE: 3656 case NETDEV_POST_TYPE_CHANGE: 3657 if (idev) 3658 addrconf_type_change(dev, event); 3659 break; 3660 3661 case NETDEV_CHANGEUPPER: 3662 info = ptr; 3663 3664 /* flush all routes if dev is linked to or unlinked from 3665 * an L3 master device (e.g., VRF) 3666 */ 3667 if (info->upper_dev && netif_is_l3_master(info->upper_dev)) 3668 addrconf_ifdown(dev, 0); 3669 } 3670 3671 return NOTIFY_OK; 3672 } 3673 3674 /* 3675 * addrconf module should be notified of a device going up 3676 */ 3677 static struct notifier_block ipv6_dev_notf = { 3678 .notifier_call = addrconf_notify, 3679 .priority = ADDRCONF_NOTIFY_PRIORITY, 3680 }; 3681 3682 static void addrconf_type_change(struct net_device *dev, unsigned long event) 3683 { 3684 struct inet6_dev *idev; 3685 ASSERT_RTNL(); 3686 3687 idev = __in6_dev_get(dev); 3688 3689 if (event == NETDEV_POST_TYPE_CHANGE) 3690 ipv6_mc_remap(idev); 3691 else if (event == NETDEV_PRE_TYPE_CHANGE) 3692 ipv6_mc_unmap(idev); 3693 } 3694 3695 static bool addr_is_local(const struct in6_addr *addr) 3696 { 3697 return ipv6_addr_type(addr) & 3698 (IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK); 3699 } 3700 3701 static int addrconf_ifdown(struct net_device *dev, int how) 3702 { 3703 unsigned long event = how ? NETDEV_UNREGISTER : NETDEV_DOWN; 3704 struct net *net = dev_net(dev); 3705 struct inet6_dev *idev; 3706 struct inet6_ifaddr *ifa, *tmp; 3707 bool keep_addr = false; 3708 int state, i; 3709 3710 ASSERT_RTNL(); 3711 3712 rt6_disable_ip(dev, event); 3713 3714 idev = __in6_dev_get(dev); 3715 if (!idev) 3716 return -ENODEV; 3717 3718 /* 3719 * Step 1: remove reference to ipv6 device from parent device. 3720 * Do not dev_put! 3721 */ 3722 if (how) { 3723 idev->dead = 1; 3724 3725 /* protected by rtnl_lock */ 3726 RCU_INIT_POINTER(dev->ip6_ptr, NULL); 3727 3728 /* Step 1.5: remove snmp6 entry */ 3729 snmp6_unregister_dev(idev); 3730 3731 } 3732 3733 /* combine the user config with event to determine if permanent 3734 * addresses are to be removed from address hash table 3735 */ 3736 if (!how && !idev->cnf.disable_ipv6) { 3737 /* aggregate the system setting and interface setting */ 3738 int _keep_addr = net->ipv6.devconf_all->keep_addr_on_down; 3739 3740 if (!_keep_addr) 3741 _keep_addr = idev->cnf.keep_addr_on_down; 3742 3743 keep_addr = (_keep_addr > 0); 3744 } 3745 3746 /* Step 2: clear hash table */ 3747 for (i = 0; i < IN6_ADDR_HSIZE; i++) { 3748 struct hlist_head *h = &inet6_addr_lst[i]; 3749 3750 spin_lock_bh(&addrconf_hash_lock); 3751 restart: 3752 hlist_for_each_entry_rcu(ifa, h, addr_lst) { 3753 if (ifa->idev == idev) { 3754 addrconf_del_dad_work(ifa); 3755 /* combined flag + permanent flag decide if 3756 * address is retained on a down event 3757 */ 3758 if (!keep_addr || 3759 !(ifa->flags & IFA_F_PERMANENT) || 3760 addr_is_local(&ifa->addr)) { 3761 hlist_del_init_rcu(&ifa->addr_lst); 3762 goto restart; 3763 } 3764 } 3765 } 3766 spin_unlock_bh(&addrconf_hash_lock); 3767 } 3768 3769 write_lock_bh(&idev->lock); 3770 3771 addrconf_del_rs_timer(idev); 3772 3773 /* Step 2: clear flags for stateless addrconf */ 3774 if (!how) 3775 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY); 3776 3777 /* Step 3: clear tempaddr list */ 3778 while (!list_empty(&idev->tempaddr_list)) { 3779 ifa = list_first_entry(&idev->tempaddr_list, 3780 struct inet6_ifaddr, tmp_list); 3781 list_del(&ifa->tmp_list); 3782 write_unlock_bh(&idev->lock); 3783 spin_lock_bh(&ifa->lock); 3784 3785 if (ifa->ifpub) { 3786 in6_ifa_put(ifa->ifpub); 3787 ifa->ifpub = NULL; 3788 } 3789 spin_unlock_bh(&ifa->lock); 3790 in6_ifa_put(ifa); 3791 write_lock_bh(&idev->lock); 3792 } 3793 3794 list_for_each_entry_safe(ifa, tmp, &idev->addr_list, if_list) { 3795 struct fib6_info *rt = NULL; 3796 bool keep; 3797 3798 addrconf_del_dad_work(ifa); 3799 3800 keep = keep_addr && (ifa->flags & IFA_F_PERMANENT) && 3801 !addr_is_local(&ifa->addr); 3802 3803 write_unlock_bh(&idev->lock); 3804 spin_lock_bh(&ifa->lock); 3805 3806 if (keep) { 3807 /* set state to skip the notifier below */ 3808 state = INET6_IFADDR_STATE_DEAD; 3809 ifa->state = INET6_IFADDR_STATE_PREDAD; 3810 if (!(ifa->flags & IFA_F_NODAD)) 3811 ifa->flags |= IFA_F_TENTATIVE; 3812 3813 rt = ifa->rt; 3814 ifa->rt = NULL; 3815 } else { 3816 state = ifa->state; 3817 ifa->state = INET6_IFADDR_STATE_DEAD; 3818 } 3819 3820 spin_unlock_bh(&ifa->lock); 3821 3822 if (rt) 3823 ip6_del_rt(net, rt); 3824 3825 if (state != INET6_IFADDR_STATE_DEAD) { 3826 __ipv6_ifa_notify(RTM_DELADDR, ifa); 3827 inet6addr_notifier_call_chain(NETDEV_DOWN, ifa); 3828 } else { 3829 if (idev->cnf.forwarding) 3830 addrconf_leave_anycast(ifa); 3831 addrconf_leave_solict(ifa->idev, &ifa->addr); 3832 } 3833 3834 write_lock_bh(&idev->lock); 3835 if (!keep) { 3836 list_del_rcu(&ifa->if_list); 3837 in6_ifa_put(ifa); 3838 } 3839 } 3840 3841 write_unlock_bh(&idev->lock); 3842 3843 /* Step 5: Discard anycast and multicast list */ 3844 if (how) { 3845 ipv6_ac_destroy_dev(idev); 3846 ipv6_mc_destroy_dev(idev); 3847 } else { 3848 ipv6_mc_down(idev); 3849 } 3850 3851 idev->tstamp = jiffies; 3852 3853 /* Last: Shot the device (if unregistered) */ 3854 if (how) { 3855 addrconf_sysctl_unregister(idev); 3856 neigh_parms_release(&nd_tbl, idev->nd_parms); 3857 neigh_ifdown(&nd_tbl, dev); 3858 in6_dev_put(idev); 3859 } 3860 return 0; 3861 } 3862 3863 static void addrconf_rs_timer(struct timer_list *t) 3864 { 3865 struct inet6_dev *idev = from_timer(idev, t, rs_timer); 3866 struct net_device *dev = idev->dev; 3867 struct in6_addr lladdr; 3868 3869 write_lock(&idev->lock); 3870 if (idev->dead || !(idev->if_flags & IF_READY)) 3871 goto out; 3872 3873 if (!ipv6_accept_ra(idev)) 3874 goto out; 3875 3876 /* Announcement received after solicitation was sent */ 3877 if (idev->if_flags & IF_RA_RCVD) 3878 goto out; 3879 3880 if (idev->rs_probes++ < idev->cnf.rtr_solicits || idev->cnf.rtr_solicits < 0) { 3881 write_unlock(&idev->lock); 3882 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE)) 3883 ndisc_send_rs(dev, &lladdr, 3884 &in6addr_linklocal_allrouters); 3885 else 3886 goto put; 3887 3888 write_lock(&idev->lock); 3889 idev->rs_interval = rfc3315_s14_backoff_update( 3890 idev->rs_interval, idev->cnf.rtr_solicit_max_interval); 3891 /* The wait after the last probe can be shorter */ 3892 addrconf_mod_rs_timer(idev, (idev->rs_probes == 3893 idev->cnf.rtr_solicits) ? 3894 idev->cnf.rtr_solicit_delay : 3895 idev->rs_interval); 3896 } else { 3897 /* 3898 * Note: we do not support deprecated "all on-link" 3899 * assumption any longer. 3900 */ 3901 pr_debug("%s: no IPv6 routers present\n", idev->dev->name); 3902 } 3903 3904 out: 3905 write_unlock(&idev->lock); 3906 put: 3907 in6_dev_put(idev); 3908 } 3909 3910 /* 3911 * Duplicate Address Detection 3912 */ 3913 static void addrconf_dad_kick(struct inet6_ifaddr *ifp) 3914 { 3915 unsigned long rand_num; 3916 struct inet6_dev *idev = ifp->idev; 3917 u64 nonce; 3918 3919 if (ifp->flags & IFA_F_OPTIMISTIC) 3920 rand_num = 0; 3921 else 3922 rand_num = prandom_u32() % (idev->cnf.rtr_solicit_delay ? : 1); 3923 3924 nonce = 0; 3925 if (idev->cnf.enhanced_dad || 3926 dev_net(idev->dev)->ipv6.devconf_all->enhanced_dad) { 3927 do 3928 get_random_bytes(&nonce, 6); 3929 while (nonce == 0); 3930 } 3931 ifp->dad_nonce = nonce; 3932 ifp->dad_probes = idev->cnf.dad_transmits; 3933 addrconf_mod_dad_work(ifp, rand_num); 3934 } 3935 3936 static void addrconf_dad_begin(struct inet6_ifaddr *ifp) 3937 { 3938 struct inet6_dev *idev = ifp->idev; 3939 struct net_device *dev = idev->dev; 3940 bool bump_id, notify = false; 3941 struct net *net; 3942 3943 addrconf_join_solict(dev, &ifp->addr); 3944 3945 prandom_seed((__force u32) ifp->addr.s6_addr32[3]); 3946 3947 read_lock_bh(&idev->lock); 3948 spin_lock(&ifp->lock); 3949 if (ifp->state == INET6_IFADDR_STATE_DEAD) 3950 goto out; 3951 3952 net = dev_net(dev); 3953 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) || 3954 (net->ipv6.devconf_all->accept_dad < 1 && 3955 idev->cnf.accept_dad < 1) || 3956 !(ifp->flags&IFA_F_TENTATIVE) || 3957 ifp->flags & IFA_F_NODAD) { 3958 bool send_na = false; 3959 3960 if (ifp->flags & IFA_F_TENTATIVE && 3961 !(ifp->flags & IFA_F_OPTIMISTIC)) 3962 send_na = true; 3963 bump_id = ifp->flags & IFA_F_TENTATIVE; 3964 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED); 3965 spin_unlock(&ifp->lock); 3966 read_unlock_bh(&idev->lock); 3967 3968 addrconf_dad_completed(ifp, bump_id, send_na); 3969 return; 3970 } 3971 3972 if (!(idev->if_flags & IF_READY)) { 3973 spin_unlock(&ifp->lock); 3974 read_unlock_bh(&idev->lock); 3975 /* 3976 * If the device is not ready: 3977 * - keep it tentative if it is a permanent address. 3978 * - otherwise, kill it. 3979 */ 3980 in6_ifa_hold(ifp); 3981 addrconf_dad_stop(ifp, 0); 3982 return; 3983 } 3984 3985 /* 3986 * Optimistic nodes can start receiving 3987 * Frames right away 3988 */ 3989 if (ifp->flags & IFA_F_OPTIMISTIC) { 3990 ip6_ins_rt(net, ifp->rt); 3991 if (ipv6_use_optimistic_addr(net, idev)) { 3992 /* Because optimistic nodes can use this address, 3993 * notify listeners. If DAD fails, RTM_DELADDR is sent. 3994 */ 3995 notify = true; 3996 } 3997 } 3998 3999 addrconf_dad_kick(ifp); 4000 out: 4001 spin_unlock(&ifp->lock); 4002 read_unlock_bh(&idev->lock); 4003 if (notify) 4004 ipv6_ifa_notify(RTM_NEWADDR, ifp); 4005 } 4006 4007 static void addrconf_dad_start(struct inet6_ifaddr *ifp) 4008 { 4009 bool begin_dad = false; 4010 4011 spin_lock_bh(&ifp->lock); 4012 if (ifp->state != INET6_IFADDR_STATE_DEAD) { 4013 ifp->state = INET6_IFADDR_STATE_PREDAD; 4014 begin_dad = true; 4015 } 4016 spin_unlock_bh(&ifp->lock); 4017 4018 if (begin_dad) 4019 addrconf_mod_dad_work(ifp, 0); 4020 } 4021 4022 static void addrconf_dad_work(struct work_struct *w) 4023 { 4024 struct inet6_ifaddr *ifp = container_of(to_delayed_work(w), 4025 struct inet6_ifaddr, 4026 dad_work); 4027 struct inet6_dev *idev = ifp->idev; 4028 bool bump_id, disable_ipv6 = false; 4029 struct in6_addr mcaddr; 4030 4031 enum { 4032 DAD_PROCESS, 4033 DAD_BEGIN, 4034 DAD_ABORT, 4035 } action = DAD_PROCESS; 4036 4037 rtnl_lock(); 4038 4039 spin_lock_bh(&ifp->lock); 4040 if (ifp->state == INET6_IFADDR_STATE_PREDAD) { 4041 action = DAD_BEGIN; 4042 ifp->state = INET6_IFADDR_STATE_DAD; 4043 } else if (ifp->state == INET6_IFADDR_STATE_ERRDAD) { 4044 action = DAD_ABORT; 4045 ifp->state = INET6_IFADDR_STATE_POSTDAD; 4046 4047 if ((dev_net(idev->dev)->ipv6.devconf_all->accept_dad > 1 || 4048 idev->cnf.accept_dad > 1) && 4049 !idev->cnf.disable_ipv6 && 4050 !(ifp->flags & IFA_F_STABLE_PRIVACY)) { 4051 struct in6_addr addr; 4052 4053 addr.s6_addr32[0] = htonl(0xfe800000); 4054 addr.s6_addr32[1] = 0; 4055 4056 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) && 4057 ipv6_addr_equal(&ifp->addr, &addr)) { 4058 /* DAD failed for link-local based on MAC */ 4059 idev->cnf.disable_ipv6 = 1; 4060 4061 pr_info("%s: IPv6 being disabled!\n", 4062 ifp->idev->dev->name); 4063 disable_ipv6 = true; 4064 } 4065 } 4066 } 4067 spin_unlock_bh(&ifp->lock); 4068 4069 if (action == DAD_BEGIN) { 4070 addrconf_dad_begin(ifp); 4071 goto out; 4072 } else if (action == DAD_ABORT) { 4073 in6_ifa_hold(ifp); 4074 addrconf_dad_stop(ifp, 1); 4075 if (disable_ipv6) 4076 addrconf_ifdown(idev->dev, 0); 4077 goto out; 4078 } 4079 4080 if (!ifp->dad_probes && addrconf_dad_end(ifp)) 4081 goto out; 4082 4083 write_lock_bh(&idev->lock); 4084 if (idev->dead || !(idev->if_flags & IF_READY)) { 4085 write_unlock_bh(&idev->lock); 4086 goto out; 4087 } 4088 4089 spin_lock(&ifp->lock); 4090 if (ifp->state == INET6_IFADDR_STATE_DEAD) { 4091 spin_unlock(&ifp->lock); 4092 write_unlock_bh(&idev->lock); 4093 goto out; 4094 } 4095 4096 if (ifp->dad_probes == 0) { 4097 bool send_na = false; 4098 4099 /* 4100 * DAD was successful 4101 */ 4102 4103 if (ifp->flags & IFA_F_TENTATIVE && 4104 !(ifp->flags & IFA_F_OPTIMISTIC)) 4105 send_na = true; 4106 bump_id = ifp->flags & IFA_F_TENTATIVE; 4107 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED); 4108 spin_unlock(&ifp->lock); 4109 write_unlock_bh(&idev->lock); 4110 4111 addrconf_dad_completed(ifp, bump_id, send_na); 4112 4113 goto out; 4114 } 4115 4116 ifp->dad_probes--; 4117 addrconf_mod_dad_work(ifp, 4118 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME)); 4119 spin_unlock(&ifp->lock); 4120 write_unlock_bh(&idev->lock); 4121 4122 /* send a neighbour solicitation for our addr */ 4123 addrconf_addr_solict_mult(&ifp->addr, &mcaddr); 4124 ndisc_send_ns(ifp->idev->dev, &ifp->addr, &mcaddr, &in6addr_any, 4125 ifp->dad_nonce); 4126 out: 4127 in6_ifa_put(ifp); 4128 rtnl_unlock(); 4129 } 4130 4131 /* ifp->idev must be at least read locked */ 4132 static bool ipv6_lonely_lladdr(struct inet6_ifaddr *ifp) 4133 { 4134 struct inet6_ifaddr *ifpiter; 4135 struct inet6_dev *idev = ifp->idev; 4136 4137 list_for_each_entry_reverse(ifpiter, &idev->addr_list, if_list) { 4138 if (ifpiter->scope > IFA_LINK) 4139 break; 4140 if (ifp != ifpiter && ifpiter->scope == IFA_LINK && 4141 (ifpiter->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE| 4142 IFA_F_OPTIMISTIC|IFA_F_DADFAILED)) == 4143 IFA_F_PERMANENT) 4144 return false; 4145 } 4146 return true; 4147 } 4148 4149 static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id, 4150 bool send_na) 4151 { 4152 struct net_device *dev = ifp->idev->dev; 4153 struct in6_addr lladdr; 4154 bool send_rs, send_mld; 4155 4156 addrconf_del_dad_work(ifp); 4157 4158 /* 4159 * Configure the address for reception. Now it is valid. 4160 */ 4161 4162 ipv6_ifa_notify(RTM_NEWADDR, ifp); 4163 4164 /* If added prefix is link local and we are prepared to process 4165 router advertisements, start sending router solicitations. 4166 */ 4167 4168 read_lock_bh(&ifp->idev->lock); 4169 send_mld = ifp->scope == IFA_LINK && ipv6_lonely_lladdr(ifp); 4170 send_rs = send_mld && 4171 ipv6_accept_ra(ifp->idev) && 4172 ifp->idev->cnf.rtr_solicits != 0 && 4173 (dev->flags&IFF_LOOPBACK) == 0; 4174 read_unlock_bh(&ifp->idev->lock); 4175 4176 /* While dad is in progress mld report's source address is in6_addrany. 4177 * Resend with proper ll now. 4178 */ 4179 if (send_mld) 4180 ipv6_mc_dad_complete(ifp->idev); 4181 4182 /* send unsolicited NA if enabled */ 4183 if (send_na && 4184 (ifp->idev->cnf.ndisc_notify || 4185 dev_net(dev)->ipv6.devconf_all->ndisc_notify)) { 4186 ndisc_send_na(dev, &in6addr_linklocal_allnodes, &ifp->addr, 4187 /*router=*/ !!ifp->idev->cnf.forwarding, 4188 /*solicited=*/ false, /*override=*/ true, 4189 /*inc_opt=*/ true); 4190 } 4191 4192 if (send_rs) { 4193 /* 4194 * If a host as already performed a random delay 4195 * [...] as part of DAD [...] there is no need 4196 * to delay again before sending the first RS 4197 */ 4198 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE)) 4199 return; 4200 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters); 4201 4202 write_lock_bh(&ifp->idev->lock); 4203 spin_lock(&ifp->lock); 4204 ifp->idev->rs_interval = rfc3315_s14_backoff_init( 4205 ifp->idev->cnf.rtr_solicit_interval); 4206 ifp->idev->rs_probes = 1; 4207 ifp->idev->if_flags |= IF_RS_SENT; 4208 addrconf_mod_rs_timer(ifp->idev, ifp->idev->rs_interval); 4209 spin_unlock(&ifp->lock); 4210 write_unlock_bh(&ifp->idev->lock); 4211 } 4212 4213 if (bump_id) 4214 rt_genid_bump_ipv6(dev_net(dev)); 4215 4216 /* Make sure that a new temporary address will be created 4217 * before this temporary address becomes deprecated. 4218 */ 4219 if (ifp->flags & IFA_F_TEMPORARY) 4220 addrconf_verify_rtnl(); 4221 } 4222 4223 static void addrconf_dad_run(struct inet6_dev *idev, bool restart) 4224 { 4225 struct inet6_ifaddr *ifp; 4226 4227 read_lock_bh(&idev->lock); 4228 list_for_each_entry(ifp, &idev->addr_list, if_list) { 4229 spin_lock(&ifp->lock); 4230 if ((ifp->flags & IFA_F_TENTATIVE && 4231 ifp->state == INET6_IFADDR_STATE_DAD) || restart) { 4232 if (restart) 4233 ifp->state = INET6_IFADDR_STATE_PREDAD; 4234 addrconf_dad_kick(ifp); 4235 } 4236 spin_unlock(&ifp->lock); 4237 } 4238 read_unlock_bh(&idev->lock); 4239 } 4240 4241 #ifdef CONFIG_PROC_FS 4242 struct if6_iter_state { 4243 struct seq_net_private p; 4244 int bucket; 4245 int offset; 4246 }; 4247 4248 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos) 4249 { 4250 struct if6_iter_state *state = seq->private; 4251 struct net *net = seq_file_net(seq); 4252 struct inet6_ifaddr *ifa = NULL; 4253 int p = 0; 4254 4255 /* initial bucket if pos is 0 */ 4256 if (pos == 0) { 4257 state->bucket = 0; 4258 state->offset = 0; 4259 } 4260 4261 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) { 4262 hlist_for_each_entry_rcu(ifa, &inet6_addr_lst[state->bucket], 4263 addr_lst) { 4264 if (!net_eq(dev_net(ifa->idev->dev), net)) 4265 continue; 4266 /* sync with offset */ 4267 if (p < state->offset) { 4268 p++; 4269 continue; 4270 } 4271 return ifa; 4272 } 4273 4274 /* prepare for next bucket */ 4275 state->offset = 0; 4276 p = 0; 4277 } 4278 return NULL; 4279 } 4280 4281 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, 4282 struct inet6_ifaddr *ifa) 4283 { 4284 struct if6_iter_state *state = seq->private; 4285 struct net *net = seq_file_net(seq); 4286 4287 hlist_for_each_entry_continue_rcu(ifa, addr_lst) { 4288 if (!net_eq(dev_net(ifa->idev->dev), net)) 4289 continue; 4290 state->offset++; 4291 return ifa; 4292 } 4293 4294 state->offset = 0; 4295 while (++state->bucket < IN6_ADDR_HSIZE) { 4296 hlist_for_each_entry_rcu(ifa, 4297 &inet6_addr_lst[state->bucket], addr_lst) { 4298 if (!net_eq(dev_net(ifa->idev->dev), net)) 4299 continue; 4300 return ifa; 4301 } 4302 } 4303 4304 return NULL; 4305 } 4306 4307 static void *if6_seq_start(struct seq_file *seq, loff_t *pos) 4308 __acquires(rcu) 4309 { 4310 rcu_read_lock(); 4311 return if6_get_first(seq, *pos); 4312 } 4313 4314 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos) 4315 { 4316 struct inet6_ifaddr *ifa; 4317 4318 ifa = if6_get_next(seq, v); 4319 ++*pos; 4320 return ifa; 4321 } 4322 4323 static void if6_seq_stop(struct seq_file *seq, void *v) 4324 __releases(rcu) 4325 { 4326 rcu_read_unlock(); 4327 } 4328 4329 static int if6_seq_show(struct seq_file *seq, void *v) 4330 { 4331 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v; 4332 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n", 4333 &ifp->addr, 4334 ifp->idev->dev->ifindex, 4335 ifp->prefix_len, 4336 ifp->scope, 4337 (u8) ifp->flags, 4338 ifp->idev->dev->name); 4339 return 0; 4340 } 4341 4342 static const struct seq_operations if6_seq_ops = { 4343 .start = if6_seq_start, 4344 .next = if6_seq_next, 4345 .show = if6_seq_show, 4346 .stop = if6_seq_stop, 4347 }; 4348 4349 static int __net_init if6_proc_net_init(struct net *net) 4350 { 4351 if (!proc_create_net("if_inet6", 0444, net->proc_net, &if6_seq_ops, 4352 sizeof(struct if6_iter_state))) 4353 return -ENOMEM; 4354 return 0; 4355 } 4356 4357 static void __net_exit if6_proc_net_exit(struct net *net) 4358 { 4359 remove_proc_entry("if_inet6", net->proc_net); 4360 } 4361 4362 static struct pernet_operations if6_proc_net_ops = { 4363 .init = if6_proc_net_init, 4364 .exit = if6_proc_net_exit, 4365 }; 4366 4367 int __init if6_proc_init(void) 4368 { 4369 return register_pernet_subsys(&if6_proc_net_ops); 4370 } 4371 4372 void if6_proc_exit(void) 4373 { 4374 unregister_pernet_subsys(&if6_proc_net_ops); 4375 } 4376 #endif /* CONFIG_PROC_FS */ 4377 4378 #if IS_ENABLED(CONFIG_IPV6_MIP6) 4379 /* Check if address is a home address configured on any interface. */ 4380 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr) 4381 { 4382 unsigned int hash = inet6_addr_hash(net, addr); 4383 struct inet6_ifaddr *ifp = NULL; 4384 int ret = 0; 4385 4386 rcu_read_lock(); 4387 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) { 4388 if (!net_eq(dev_net(ifp->idev->dev), net)) 4389 continue; 4390 if (ipv6_addr_equal(&ifp->addr, addr) && 4391 (ifp->flags & IFA_F_HOMEADDRESS)) { 4392 ret = 1; 4393 break; 4394 } 4395 } 4396 rcu_read_unlock(); 4397 return ret; 4398 } 4399 #endif 4400 4401 /* 4402 * Periodic address status verification 4403 */ 4404 4405 static void addrconf_verify_rtnl(void) 4406 { 4407 unsigned long now, next, next_sec, next_sched; 4408 struct inet6_ifaddr *ifp; 4409 int i; 4410 4411 ASSERT_RTNL(); 4412 4413 rcu_read_lock_bh(); 4414 now = jiffies; 4415 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY); 4416 4417 cancel_delayed_work(&addr_chk_work); 4418 4419 for (i = 0; i < IN6_ADDR_HSIZE; i++) { 4420 restart: 4421 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[i], addr_lst) { 4422 unsigned long age; 4423 4424 /* When setting preferred_lft to a value not zero or 4425 * infinity, while valid_lft is infinity 4426 * IFA_F_PERMANENT has a non-infinity life time. 4427 */ 4428 if ((ifp->flags & IFA_F_PERMANENT) && 4429 (ifp->prefered_lft == INFINITY_LIFE_TIME)) 4430 continue; 4431 4432 spin_lock(&ifp->lock); 4433 /* We try to batch several events at once. */ 4434 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ; 4435 4436 if (ifp->valid_lft != INFINITY_LIFE_TIME && 4437 age >= ifp->valid_lft) { 4438 spin_unlock(&ifp->lock); 4439 in6_ifa_hold(ifp); 4440 ipv6_del_addr(ifp); 4441 goto restart; 4442 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) { 4443 spin_unlock(&ifp->lock); 4444 continue; 4445 } else if (age >= ifp->prefered_lft) { 4446 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */ 4447 int deprecate = 0; 4448 4449 if (!(ifp->flags&IFA_F_DEPRECATED)) { 4450 deprecate = 1; 4451 ifp->flags |= IFA_F_DEPRECATED; 4452 } 4453 4454 if ((ifp->valid_lft != INFINITY_LIFE_TIME) && 4455 (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))) 4456 next = ifp->tstamp + ifp->valid_lft * HZ; 4457 4458 spin_unlock(&ifp->lock); 4459 4460 if (deprecate) { 4461 in6_ifa_hold(ifp); 4462 4463 ipv6_ifa_notify(0, ifp); 4464 in6_ifa_put(ifp); 4465 goto restart; 4466 } 4467 } else if ((ifp->flags&IFA_F_TEMPORARY) && 4468 !(ifp->flags&IFA_F_TENTATIVE)) { 4469 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry * 4470 ifp->idev->cnf.dad_transmits * 4471 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME) / HZ; 4472 4473 if (age >= ifp->prefered_lft - regen_advance) { 4474 struct inet6_ifaddr *ifpub = ifp->ifpub; 4475 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 4476 next = ifp->tstamp + ifp->prefered_lft * HZ; 4477 if (!ifp->regen_count && ifpub) { 4478 ifp->regen_count++; 4479 in6_ifa_hold(ifp); 4480 in6_ifa_hold(ifpub); 4481 spin_unlock(&ifp->lock); 4482 4483 spin_lock(&ifpub->lock); 4484 ifpub->regen_count = 0; 4485 spin_unlock(&ifpub->lock); 4486 rcu_read_unlock_bh(); 4487 ipv6_create_tempaddr(ifpub, ifp, true); 4488 in6_ifa_put(ifpub); 4489 in6_ifa_put(ifp); 4490 rcu_read_lock_bh(); 4491 goto restart; 4492 } 4493 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next)) 4494 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ; 4495 spin_unlock(&ifp->lock); 4496 } else { 4497 /* ifp->prefered_lft <= ifp->valid_lft */ 4498 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 4499 next = ifp->tstamp + ifp->prefered_lft * HZ; 4500 spin_unlock(&ifp->lock); 4501 } 4502 } 4503 } 4504 4505 next_sec = round_jiffies_up(next); 4506 next_sched = next; 4507 4508 /* If rounded timeout is accurate enough, accept it. */ 4509 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ)) 4510 next_sched = next_sec; 4511 4512 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */ 4513 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX)) 4514 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX; 4515 4516 pr_debug("now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n", 4517 now, next, next_sec, next_sched); 4518 mod_delayed_work(addrconf_wq, &addr_chk_work, next_sched - now); 4519 rcu_read_unlock_bh(); 4520 } 4521 4522 static void addrconf_verify_work(struct work_struct *w) 4523 { 4524 rtnl_lock(); 4525 addrconf_verify_rtnl(); 4526 rtnl_unlock(); 4527 } 4528 4529 static void addrconf_verify(void) 4530 { 4531 mod_delayed_work(addrconf_wq, &addr_chk_work, 0); 4532 } 4533 4534 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local, 4535 struct in6_addr **peer_pfx) 4536 { 4537 struct in6_addr *pfx = NULL; 4538 4539 *peer_pfx = NULL; 4540 4541 if (addr) 4542 pfx = nla_data(addr); 4543 4544 if (local) { 4545 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx))) 4546 *peer_pfx = pfx; 4547 pfx = nla_data(local); 4548 } 4549 4550 return pfx; 4551 } 4552 4553 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = { 4554 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) }, 4555 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) }, 4556 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) }, 4557 [IFA_FLAGS] = { .len = sizeof(u32) }, 4558 [IFA_RT_PRIORITY] = { .len = sizeof(u32) }, 4559 [IFA_TARGET_NETNSID] = { .type = NLA_S32 }, 4560 }; 4561 4562 static int 4563 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, 4564 struct netlink_ext_ack *extack) 4565 { 4566 struct net *net = sock_net(skb->sk); 4567 struct ifaddrmsg *ifm; 4568 struct nlattr *tb[IFA_MAX+1]; 4569 struct in6_addr *pfx, *peer_pfx; 4570 u32 ifa_flags; 4571 int err; 4572 4573 err = nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX, 4574 ifa_ipv6_policy, extack); 4575 if (err < 0) 4576 return err; 4577 4578 ifm = nlmsg_data(nlh); 4579 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx); 4580 if (!pfx) 4581 return -EINVAL; 4582 4583 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags; 4584 4585 /* We ignore other flags so far. */ 4586 ifa_flags &= IFA_F_MANAGETEMPADDR; 4587 4588 return inet6_addr_del(net, ifm->ifa_index, ifa_flags, pfx, 4589 ifm->ifa_prefixlen); 4590 } 4591 4592 static int modify_prefix_route(struct inet6_ifaddr *ifp, 4593 unsigned long expires, u32 flags, 4594 bool modify_peer) 4595 { 4596 struct fib6_info *f6i; 4597 u32 prio; 4598 4599 f6i = addrconf_get_prefix_route(modify_peer ? &ifp->peer_addr : &ifp->addr, 4600 ifp->prefix_len, 4601 ifp->idev->dev, 0, RTF_DEFAULT, true); 4602 if (!f6i) 4603 return -ENOENT; 4604 4605 prio = ifp->rt_priority ? : IP6_RT_PRIO_ADDRCONF; 4606 if (f6i->fib6_metric != prio) { 4607 /* delete old one */ 4608 ip6_del_rt(dev_net(ifp->idev->dev), f6i); 4609 4610 /* add new one */ 4611 addrconf_prefix_route(modify_peer ? &ifp->peer_addr : &ifp->addr, 4612 ifp->prefix_len, 4613 ifp->rt_priority, ifp->idev->dev, 4614 expires, flags, GFP_KERNEL); 4615 } else { 4616 if (!expires) 4617 fib6_clean_expires(f6i); 4618 else 4619 fib6_set_expires(f6i, expires); 4620 4621 fib6_info_release(f6i); 4622 } 4623 4624 return 0; 4625 } 4626 4627 static int inet6_addr_modify(struct inet6_ifaddr *ifp, struct ifa6_config *cfg) 4628 { 4629 u32 flags; 4630 clock_t expires; 4631 unsigned long timeout; 4632 bool was_managetempaddr; 4633 bool had_prefixroute; 4634 bool new_peer = false; 4635 4636 ASSERT_RTNL(); 4637 4638 if (!cfg->valid_lft || cfg->preferred_lft > cfg->valid_lft) 4639 return -EINVAL; 4640 4641 if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR && 4642 (ifp->flags & IFA_F_TEMPORARY || ifp->prefix_len != 64)) 4643 return -EINVAL; 4644 4645 if (!(ifp->flags & IFA_F_TENTATIVE) || ifp->flags & IFA_F_DADFAILED) 4646 cfg->ifa_flags &= ~IFA_F_OPTIMISTIC; 4647 4648 timeout = addrconf_timeout_fixup(cfg->valid_lft, HZ); 4649 if (addrconf_finite_timeout(timeout)) { 4650 expires = jiffies_to_clock_t(timeout * HZ); 4651 cfg->valid_lft = timeout; 4652 flags = RTF_EXPIRES; 4653 } else { 4654 expires = 0; 4655 flags = 0; 4656 cfg->ifa_flags |= IFA_F_PERMANENT; 4657 } 4658 4659 timeout = addrconf_timeout_fixup(cfg->preferred_lft, HZ); 4660 if (addrconf_finite_timeout(timeout)) { 4661 if (timeout == 0) 4662 cfg->ifa_flags |= IFA_F_DEPRECATED; 4663 cfg->preferred_lft = timeout; 4664 } 4665 4666 if (cfg->peer_pfx && 4667 memcmp(&ifp->peer_addr, cfg->peer_pfx, sizeof(struct in6_addr))) { 4668 if (!ipv6_addr_any(&ifp->peer_addr)) 4669 cleanup_prefix_route(ifp, expires, true, true); 4670 new_peer = true; 4671 } 4672 4673 spin_lock_bh(&ifp->lock); 4674 was_managetempaddr = ifp->flags & IFA_F_MANAGETEMPADDR; 4675 had_prefixroute = ifp->flags & IFA_F_PERMANENT && 4676 !(ifp->flags & IFA_F_NOPREFIXROUTE); 4677 ifp->flags &= ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | 4678 IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR | 4679 IFA_F_NOPREFIXROUTE); 4680 ifp->flags |= cfg->ifa_flags; 4681 ifp->tstamp = jiffies; 4682 ifp->valid_lft = cfg->valid_lft; 4683 ifp->prefered_lft = cfg->preferred_lft; 4684 4685 if (cfg->rt_priority && cfg->rt_priority != ifp->rt_priority) 4686 ifp->rt_priority = cfg->rt_priority; 4687 4688 if (new_peer) 4689 ifp->peer_addr = *cfg->peer_pfx; 4690 4691 spin_unlock_bh(&ifp->lock); 4692 if (!(ifp->flags&IFA_F_TENTATIVE)) 4693 ipv6_ifa_notify(0, ifp); 4694 4695 if (!(cfg->ifa_flags & IFA_F_NOPREFIXROUTE)) { 4696 int rc = -ENOENT; 4697 4698 if (had_prefixroute) 4699 rc = modify_prefix_route(ifp, expires, flags, false); 4700 4701 /* prefix route could have been deleted; if so restore it */ 4702 if (rc == -ENOENT) { 4703 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, 4704 ifp->rt_priority, ifp->idev->dev, 4705 expires, flags, GFP_KERNEL); 4706 } 4707 4708 if (had_prefixroute && !ipv6_addr_any(&ifp->peer_addr)) 4709 rc = modify_prefix_route(ifp, expires, flags, true); 4710 4711 if (rc == -ENOENT && !ipv6_addr_any(&ifp->peer_addr)) { 4712 addrconf_prefix_route(&ifp->peer_addr, ifp->prefix_len, 4713 ifp->rt_priority, ifp->idev->dev, 4714 expires, flags, GFP_KERNEL); 4715 } 4716 } else if (had_prefixroute) { 4717 enum cleanup_prefix_rt_t action; 4718 unsigned long rt_expires; 4719 4720 write_lock_bh(&ifp->idev->lock); 4721 action = check_cleanup_prefix_route(ifp, &rt_expires); 4722 write_unlock_bh(&ifp->idev->lock); 4723 4724 if (action != CLEANUP_PREFIX_RT_NOP) { 4725 cleanup_prefix_route(ifp, rt_expires, 4726 action == CLEANUP_PREFIX_RT_DEL, false); 4727 } 4728 } 4729 4730 if (was_managetempaddr || ifp->flags & IFA_F_MANAGETEMPADDR) { 4731 if (was_managetempaddr && 4732 !(ifp->flags & IFA_F_MANAGETEMPADDR)) { 4733 cfg->valid_lft = 0; 4734 cfg->preferred_lft = 0; 4735 } 4736 manage_tempaddrs(ifp->idev, ifp, cfg->valid_lft, 4737 cfg->preferred_lft, !was_managetempaddr, 4738 jiffies); 4739 } 4740 4741 addrconf_verify_rtnl(); 4742 4743 return 0; 4744 } 4745 4746 static int 4747 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, 4748 struct netlink_ext_ack *extack) 4749 { 4750 struct net *net = sock_net(skb->sk); 4751 struct ifaddrmsg *ifm; 4752 struct nlattr *tb[IFA_MAX+1]; 4753 struct in6_addr *peer_pfx; 4754 struct inet6_ifaddr *ifa; 4755 struct net_device *dev; 4756 struct inet6_dev *idev; 4757 struct ifa6_config cfg; 4758 int err; 4759 4760 err = nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX, 4761 ifa_ipv6_policy, extack); 4762 if (err < 0) 4763 return err; 4764 4765 memset(&cfg, 0, sizeof(cfg)); 4766 4767 ifm = nlmsg_data(nlh); 4768 cfg.pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx); 4769 if (!cfg.pfx) 4770 return -EINVAL; 4771 4772 cfg.peer_pfx = peer_pfx; 4773 cfg.plen = ifm->ifa_prefixlen; 4774 if (tb[IFA_RT_PRIORITY]) 4775 cfg.rt_priority = nla_get_u32(tb[IFA_RT_PRIORITY]); 4776 4777 cfg.valid_lft = INFINITY_LIFE_TIME; 4778 cfg.preferred_lft = INFINITY_LIFE_TIME; 4779 4780 if (tb[IFA_CACHEINFO]) { 4781 struct ifa_cacheinfo *ci; 4782 4783 ci = nla_data(tb[IFA_CACHEINFO]); 4784 cfg.valid_lft = ci->ifa_valid; 4785 cfg.preferred_lft = ci->ifa_prefered; 4786 } 4787 4788 dev = __dev_get_by_index(net, ifm->ifa_index); 4789 if (!dev) 4790 return -ENODEV; 4791 4792 if (tb[IFA_FLAGS]) 4793 cfg.ifa_flags = nla_get_u32(tb[IFA_FLAGS]); 4794 else 4795 cfg.ifa_flags = ifm->ifa_flags; 4796 4797 /* We ignore other flags so far. */ 4798 cfg.ifa_flags &= IFA_F_NODAD | IFA_F_HOMEADDRESS | 4799 IFA_F_MANAGETEMPADDR | IFA_F_NOPREFIXROUTE | 4800 IFA_F_MCAUTOJOIN | IFA_F_OPTIMISTIC; 4801 4802 idev = ipv6_find_idev(dev); 4803 if (IS_ERR(idev)) 4804 return PTR_ERR(idev); 4805 4806 if (!ipv6_allow_optimistic_dad(net, idev)) 4807 cfg.ifa_flags &= ~IFA_F_OPTIMISTIC; 4808 4809 if (cfg.ifa_flags & IFA_F_NODAD && 4810 cfg.ifa_flags & IFA_F_OPTIMISTIC) { 4811 NL_SET_ERR_MSG(extack, "IFA_F_NODAD and IFA_F_OPTIMISTIC are mutually exclusive"); 4812 return -EINVAL; 4813 } 4814 4815 ifa = ipv6_get_ifaddr(net, cfg.pfx, dev, 1); 4816 if (!ifa) { 4817 /* 4818 * It would be best to check for !NLM_F_CREATE here but 4819 * userspace already relies on not having to provide this. 4820 */ 4821 return inet6_addr_add(net, ifm->ifa_index, &cfg, extack); 4822 } 4823 4824 if (nlh->nlmsg_flags & NLM_F_EXCL || 4825 !(nlh->nlmsg_flags & NLM_F_REPLACE)) 4826 err = -EEXIST; 4827 else 4828 err = inet6_addr_modify(ifa, &cfg); 4829 4830 in6_ifa_put(ifa); 4831 4832 return err; 4833 } 4834 4835 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u32 flags, 4836 u8 scope, int ifindex) 4837 { 4838 struct ifaddrmsg *ifm; 4839 4840 ifm = nlmsg_data(nlh); 4841 ifm->ifa_family = AF_INET6; 4842 ifm->ifa_prefixlen = prefixlen; 4843 ifm->ifa_flags = flags; 4844 ifm->ifa_scope = scope; 4845 ifm->ifa_index = ifindex; 4846 } 4847 4848 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp, 4849 unsigned long tstamp, u32 preferred, u32 valid) 4850 { 4851 struct ifa_cacheinfo ci; 4852 4853 ci.cstamp = cstamp_delta(cstamp); 4854 ci.tstamp = cstamp_delta(tstamp); 4855 ci.ifa_prefered = preferred; 4856 ci.ifa_valid = valid; 4857 4858 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci); 4859 } 4860 4861 static inline int rt_scope(int ifa_scope) 4862 { 4863 if (ifa_scope & IFA_HOST) 4864 return RT_SCOPE_HOST; 4865 else if (ifa_scope & IFA_LINK) 4866 return RT_SCOPE_LINK; 4867 else if (ifa_scope & IFA_SITE) 4868 return RT_SCOPE_SITE; 4869 else 4870 return RT_SCOPE_UNIVERSE; 4871 } 4872 4873 static inline int inet6_ifaddr_msgsize(void) 4874 { 4875 return NLMSG_ALIGN(sizeof(struct ifaddrmsg)) 4876 + nla_total_size(16) /* IFA_LOCAL */ 4877 + nla_total_size(16) /* IFA_ADDRESS */ 4878 + nla_total_size(sizeof(struct ifa_cacheinfo)) 4879 + nla_total_size(4) /* IFA_FLAGS */ 4880 + nla_total_size(4) /* IFA_RT_PRIORITY */; 4881 } 4882 4883 enum addr_type_t { 4884 UNICAST_ADDR, 4885 MULTICAST_ADDR, 4886 ANYCAST_ADDR, 4887 }; 4888 4889 struct inet6_fill_args { 4890 u32 portid; 4891 u32 seq; 4892 int event; 4893 unsigned int flags; 4894 int netnsid; 4895 int ifindex; 4896 enum addr_type_t type; 4897 }; 4898 4899 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa, 4900 struct inet6_fill_args *args) 4901 { 4902 struct nlmsghdr *nlh; 4903 u32 preferred, valid; 4904 4905 nlh = nlmsg_put(skb, args->portid, args->seq, args->event, 4906 sizeof(struct ifaddrmsg), args->flags); 4907 if (!nlh) 4908 return -EMSGSIZE; 4909 4910 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope), 4911 ifa->idev->dev->ifindex); 4912 4913 if (args->netnsid >= 0 && 4914 nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid)) 4915 goto error; 4916 4917 if (!((ifa->flags&IFA_F_PERMANENT) && 4918 (ifa->prefered_lft == INFINITY_LIFE_TIME))) { 4919 preferred = ifa->prefered_lft; 4920 valid = ifa->valid_lft; 4921 if (preferred != INFINITY_LIFE_TIME) { 4922 long tval = (jiffies - ifa->tstamp)/HZ; 4923 if (preferred > tval) 4924 preferred -= tval; 4925 else 4926 preferred = 0; 4927 if (valid != INFINITY_LIFE_TIME) { 4928 if (valid > tval) 4929 valid -= tval; 4930 else 4931 valid = 0; 4932 } 4933 } 4934 } else { 4935 preferred = INFINITY_LIFE_TIME; 4936 valid = INFINITY_LIFE_TIME; 4937 } 4938 4939 if (!ipv6_addr_any(&ifa->peer_addr)) { 4940 if (nla_put_in6_addr(skb, IFA_LOCAL, &ifa->addr) < 0 || 4941 nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->peer_addr) < 0) 4942 goto error; 4943 } else 4944 if (nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->addr) < 0) 4945 goto error; 4946 4947 if (ifa->rt_priority && 4948 nla_put_u32(skb, IFA_RT_PRIORITY, ifa->rt_priority)) 4949 goto error; 4950 4951 if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) 4952 goto error; 4953 4954 if (nla_put_u32(skb, IFA_FLAGS, ifa->flags) < 0) 4955 goto error; 4956 4957 nlmsg_end(skb, nlh); 4958 return 0; 4959 4960 error: 4961 nlmsg_cancel(skb, nlh); 4962 return -EMSGSIZE; 4963 } 4964 4965 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca, 4966 struct inet6_fill_args *args) 4967 { 4968 struct nlmsghdr *nlh; 4969 u8 scope = RT_SCOPE_UNIVERSE; 4970 int ifindex = ifmca->idev->dev->ifindex; 4971 4972 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE) 4973 scope = RT_SCOPE_SITE; 4974 4975 nlh = nlmsg_put(skb, args->portid, args->seq, args->event, 4976 sizeof(struct ifaddrmsg), args->flags); 4977 if (!nlh) 4978 return -EMSGSIZE; 4979 4980 if (args->netnsid >= 0 && 4981 nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid)) 4982 return -EMSGSIZE; 4983 4984 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 4985 if (nla_put_in6_addr(skb, IFA_MULTICAST, &ifmca->mca_addr) < 0 || 4986 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp, 4987 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 4988 nlmsg_cancel(skb, nlh); 4989 return -EMSGSIZE; 4990 } 4991 4992 nlmsg_end(skb, nlh); 4993 return 0; 4994 } 4995 4996 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca, 4997 struct inet6_fill_args *args) 4998 { 4999 struct net_device *dev = fib6_info_nh_dev(ifaca->aca_rt); 5000 int ifindex = dev ? dev->ifindex : 1; 5001 struct nlmsghdr *nlh; 5002 u8 scope = RT_SCOPE_UNIVERSE; 5003 5004 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE) 5005 scope = RT_SCOPE_SITE; 5006 5007 nlh = nlmsg_put(skb, args->portid, args->seq, args->event, 5008 sizeof(struct ifaddrmsg), args->flags); 5009 if (!nlh) 5010 return -EMSGSIZE; 5011 5012 if (args->netnsid >= 0 && 5013 nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid)) 5014 return -EMSGSIZE; 5015 5016 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 5017 if (nla_put_in6_addr(skb, IFA_ANYCAST, &ifaca->aca_addr) < 0 || 5018 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp, 5019 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 5020 nlmsg_cancel(skb, nlh); 5021 return -EMSGSIZE; 5022 } 5023 5024 nlmsg_end(skb, nlh); 5025 return 0; 5026 } 5027 5028 /* called with rcu_read_lock() */ 5029 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb, 5030 struct netlink_callback *cb, int s_ip_idx, 5031 struct inet6_fill_args *fillargs) 5032 { 5033 struct ifmcaddr6 *ifmca; 5034 struct ifacaddr6 *ifaca; 5035 int ip_idx = 0; 5036 int err = 1; 5037 5038 read_lock_bh(&idev->lock); 5039 switch (fillargs->type) { 5040 case UNICAST_ADDR: { 5041 struct inet6_ifaddr *ifa; 5042 fillargs->event = RTM_NEWADDR; 5043 5044 /* unicast address incl. temp addr */ 5045 list_for_each_entry(ifa, &idev->addr_list, if_list) { 5046 if (ip_idx < s_ip_idx) 5047 goto next; 5048 err = inet6_fill_ifaddr(skb, ifa, fillargs); 5049 if (err < 0) 5050 break; 5051 nl_dump_check_consistent(cb, nlmsg_hdr(skb)); 5052 next: 5053 ip_idx++; 5054 } 5055 break; 5056 } 5057 case MULTICAST_ADDR: 5058 fillargs->event = RTM_GETMULTICAST; 5059 5060 /* multicast address */ 5061 for (ifmca = idev->mc_list; ifmca; 5062 ifmca = ifmca->next, ip_idx++) { 5063 if (ip_idx < s_ip_idx) 5064 continue; 5065 err = inet6_fill_ifmcaddr(skb, ifmca, fillargs); 5066 if (err < 0) 5067 break; 5068 } 5069 break; 5070 case ANYCAST_ADDR: 5071 fillargs->event = RTM_GETANYCAST; 5072 /* anycast address */ 5073 for (ifaca = idev->ac_list; ifaca; 5074 ifaca = ifaca->aca_next, ip_idx++) { 5075 if (ip_idx < s_ip_idx) 5076 continue; 5077 err = inet6_fill_ifacaddr(skb, ifaca, fillargs); 5078 if (err < 0) 5079 break; 5080 } 5081 break; 5082 default: 5083 break; 5084 } 5085 read_unlock_bh(&idev->lock); 5086 cb->args[2] = ip_idx; 5087 return err; 5088 } 5089 5090 static int inet6_valid_dump_ifaddr_req(const struct nlmsghdr *nlh, 5091 struct inet6_fill_args *fillargs, 5092 struct net **tgt_net, struct sock *sk, 5093 struct netlink_callback *cb) 5094 { 5095 struct netlink_ext_ack *extack = cb->extack; 5096 struct nlattr *tb[IFA_MAX+1]; 5097 struct ifaddrmsg *ifm; 5098 int err, i; 5099 5100 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) { 5101 NL_SET_ERR_MSG_MOD(extack, "Invalid header for address dump request"); 5102 return -EINVAL; 5103 } 5104 5105 ifm = nlmsg_data(nlh); 5106 if (ifm->ifa_prefixlen || ifm->ifa_flags || ifm->ifa_scope) { 5107 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for address dump request"); 5108 return -EINVAL; 5109 } 5110 5111 fillargs->ifindex = ifm->ifa_index; 5112 if (fillargs->ifindex) { 5113 cb->answer_flags |= NLM_F_DUMP_FILTERED; 5114 fillargs->flags |= NLM_F_DUMP_FILTERED; 5115 } 5116 5117 err = nlmsg_parse_deprecated_strict(nlh, sizeof(*ifm), tb, IFA_MAX, 5118 ifa_ipv6_policy, extack); 5119 if (err < 0) 5120 return err; 5121 5122 for (i = 0; i <= IFA_MAX; ++i) { 5123 if (!tb[i]) 5124 continue; 5125 5126 if (i == IFA_TARGET_NETNSID) { 5127 struct net *net; 5128 5129 fillargs->netnsid = nla_get_s32(tb[i]); 5130 net = rtnl_get_net_ns_capable(sk, fillargs->netnsid); 5131 if (IS_ERR(net)) { 5132 fillargs->netnsid = -1; 5133 NL_SET_ERR_MSG_MOD(extack, "Invalid target network namespace id"); 5134 return PTR_ERR(net); 5135 } 5136 *tgt_net = net; 5137 } else { 5138 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in dump request"); 5139 return -EINVAL; 5140 } 5141 } 5142 5143 return 0; 5144 } 5145 5146 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb, 5147 enum addr_type_t type) 5148 { 5149 const struct nlmsghdr *nlh = cb->nlh; 5150 struct inet6_fill_args fillargs = { 5151 .portid = NETLINK_CB(cb->skb).portid, 5152 .seq = cb->nlh->nlmsg_seq, 5153 .flags = NLM_F_MULTI, 5154 .netnsid = -1, 5155 .type = type, 5156 }; 5157 struct net *net = sock_net(skb->sk); 5158 struct net *tgt_net = net; 5159 int idx, s_idx, s_ip_idx; 5160 int h, s_h; 5161 struct net_device *dev; 5162 struct inet6_dev *idev; 5163 struct hlist_head *head; 5164 int err = 0; 5165 5166 s_h = cb->args[0]; 5167 s_idx = idx = cb->args[1]; 5168 s_ip_idx = cb->args[2]; 5169 5170 if (cb->strict_check) { 5171 err = inet6_valid_dump_ifaddr_req(nlh, &fillargs, &tgt_net, 5172 skb->sk, cb); 5173 if (err < 0) 5174 goto put_tgt_net; 5175 5176 err = 0; 5177 if (fillargs.ifindex) { 5178 dev = __dev_get_by_index(tgt_net, fillargs.ifindex); 5179 if (!dev) { 5180 err = -ENODEV; 5181 goto put_tgt_net; 5182 } 5183 idev = __in6_dev_get(dev); 5184 if (idev) { 5185 err = in6_dump_addrs(idev, skb, cb, s_ip_idx, 5186 &fillargs); 5187 if (err > 0) 5188 err = 0; 5189 } 5190 goto put_tgt_net; 5191 } 5192 } 5193 5194 rcu_read_lock(); 5195 cb->seq = atomic_read(&tgt_net->ipv6.dev_addr_genid) ^ tgt_net->dev_base_seq; 5196 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 5197 idx = 0; 5198 head = &tgt_net->dev_index_head[h]; 5199 hlist_for_each_entry_rcu(dev, head, index_hlist) { 5200 if (idx < s_idx) 5201 goto cont; 5202 if (h > s_h || idx > s_idx) 5203 s_ip_idx = 0; 5204 idev = __in6_dev_get(dev); 5205 if (!idev) 5206 goto cont; 5207 5208 if (in6_dump_addrs(idev, skb, cb, s_ip_idx, 5209 &fillargs) < 0) 5210 goto done; 5211 cont: 5212 idx++; 5213 } 5214 } 5215 done: 5216 rcu_read_unlock(); 5217 cb->args[0] = h; 5218 cb->args[1] = idx; 5219 put_tgt_net: 5220 if (fillargs.netnsid >= 0) 5221 put_net(tgt_net); 5222 5223 return skb->len ? : err; 5224 } 5225 5226 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb) 5227 { 5228 enum addr_type_t type = UNICAST_ADDR; 5229 5230 return inet6_dump_addr(skb, cb, type); 5231 } 5232 5233 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb) 5234 { 5235 enum addr_type_t type = MULTICAST_ADDR; 5236 5237 return inet6_dump_addr(skb, cb, type); 5238 } 5239 5240 5241 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb) 5242 { 5243 enum addr_type_t type = ANYCAST_ADDR; 5244 5245 return inet6_dump_addr(skb, cb, type); 5246 } 5247 5248 static int inet6_rtm_valid_getaddr_req(struct sk_buff *skb, 5249 const struct nlmsghdr *nlh, 5250 struct nlattr **tb, 5251 struct netlink_ext_ack *extack) 5252 { 5253 struct ifaddrmsg *ifm; 5254 int i, err; 5255 5256 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) { 5257 NL_SET_ERR_MSG_MOD(extack, "Invalid header for get address request"); 5258 return -EINVAL; 5259 } 5260 5261 if (!netlink_strict_get_check(skb)) 5262 return nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX, 5263 ifa_ipv6_policy, extack); 5264 5265 ifm = nlmsg_data(nlh); 5266 if (ifm->ifa_prefixlen || ifm->ifa_flags || ifm->ifa_scope) { 5267 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for get address request"); 5268 return -EINVAL; 5269 } 5270 5271 err = nlmsg_parse_deprecated_strict(nlh, sizeof(*ifm), tb, IFA_MAX, 5272 ifa_ipv6_policy, extack); 5273 if (err) 5274 return err; 5275 5276 for (i = 0; i <= IFA_MAX; i++) { 5277 if (!tb[i]) 5278 continue; 5279 5280 switch (i) { 5281 case IFA_TARGET_NETNSID: 5282 case IFA_ADDRESS: 5283 case IFA_LOCAL: 5284 break; 5285 default: 5286 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in get address request"); 5287 return -EINVAL; 5288 } 5289 } 5290 5291 return 0; 5292 } 5293 5294 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh, 5295 struct netlink_ext_ack *extack) 5296 { 5297 struct net *net = sock_net(in_skb->sk); 5298 struct inet6_fill_args fillargs = { 5299 .portid = NETLINK_CB(in_skb).portid, 5300 .seq = nlh->nlmsg_seq, 5301 .event = RTM_NEWADDR, 5302 .flags = 0, 5303 .netnsid = -1, 5304 }; 5305 struct net *tgt_net = net; 5306 struct ifaddrmsg *ifm; 5307 struct nlattr *tb[IFA_MAX+1]; 5308 struct in6_addr *addr = NULL, *peer; 5309 struct net_device *dev = NULL; 5310 struct inet6_ifaddr *ifa; 5311 struct sk_buff *skb; 5312 int err; 5313 5314 err = inet6_rtm_valid_getaddr_req(in_skb, nlh, tb, extack); 5315 if (err < 0) 5316 return err; 5317 5318 if (tb[IFA_TARGET_NETNSID]) { 5319 fillargs.netnsid = nla_get_s32(tb[IFA_TARGET_NETNSID]); 5320 5321 tgt_net = rtnl_get_net_ns_capable(NETLINK_CB(in_skb).sk, 5322 fillargs.netnsid); 5323 if (IS_ERR(tgt_net)) 5324 return PTR_ERR(tgt_net); 5325 } 5326 5327 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer); 5328 if (!addr) 5329 return -EINVAL; 5330 5331 ifm = nlmsg_data(nlh); 5332 if (ifm->ifa_index) 5333 dev = dev_get_by_index(tgt_net, ifm->ifa_index); 5334 5335 ifa = ipv6_get_ifaddr(tgt_net, addr, dev, 1); 5336 if (!ifa) { 5337 err = -EADDRNOTAVAIL; 5338 goto errout; 5339 } 5340 5341 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL); 5342 if (!skb) { 5343 err = -ENOBUFS; 5344 goto errout_ifa; 5345 } 5346 5347 err = inet6_fill_ifaddr(skb, ifa, &fillargs); 5348 if (err < 0) { 5349 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 5350 WARN_ON(err == -EMSGSIZE); 5351 kfree_skb(skb); 5352 goto errout_ifa; 5353 } 5354 err = rtnl_unicast(skb, tgt_net, NETLINK_CB(in_skb).portid); 5355 errout_ifa: 5356 in6_ifa_put(ifa); 5357 errout: 5358 if (dev) 5359 dev_put(dev); 5360 if (fillargs.netnsid >= 0) 5361 put_net(tgt_net); 5362 5363 return err; 5364 } 5365 5366 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa) 5367 { 5368 struct sk_buff *skb; 5369 struct net *net = dev_net(ifa->idev->dev); 5370 struct inet6_fill_args fillargs = { 5371 .portid = 0, 5372 .seq = 0, 5373 .event = event, 5374 .flags = 0, 5375 .netnsid = -1, 5376 }; 5377 int err = -ENOBUFS; 5378 5379 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC); 5380 if (!skb) 5381 goto errout; 5382 5383 err = inet6_fill_ifaddr(skb, ifa, &fillargs); 5384 if (err < 0) { 5385 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 5386 WARN_ON(err == -EMSGSIZE); 5387 kfree_skb(skb); 5388 goto errout; 5389 } 5390 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC); 5391 return; 5392 errout: 5393 if (err < 0) 5394 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err); 5395 } 5396 5397 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf, 5398 __s32 *array, int bytes) 5399 { 5400 BUG_ON(bytes < (DEVCONF_MAX * 4)); 5401 5402 memset(array, 0, bytes); 5403 array[DEVCONF_FORWARDING] = cnf->forwarding; 5404 array[DEVCONF_HOPLIMIT] = cnf->hop_limit; 5405 array[DEVCONF_MTU6] = cnf->mtu6; 5406 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra; 5407 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects; 5408 array[DEVCONF_AUTOCONF] = cnf->autoconf; 5409 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits; 5410 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits; 5411 array[DEVCONF_RTR_SOLICIT_INTERVAL] = 5412 jiffies_to_msecs(cnf->rtr_solicit_interval); 5413 array[DEVCONF_RTR_SOLICIT_MAX_INTERVAL] = 5414 jiffies_to_msecs(cnf->rtr_solicit_max_interval); 5415 array[DEVCONF_RTR_SOLICIT_DELAY] = 5416 jiffies_to_msecs(cnf->rtr_solicit_delay); 5417 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version; 5418 array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] = 5419 jiffies_to_msecs(cnf->mldv1_unsolicited_report_interval); 5420 array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] = 5421 jiffies_to_msecs(cnf->mldv2_unsolicited_report_interval); 5422 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr; 5423 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft; 5424 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft; 5425 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry; 5426 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor; 5427 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses; 5428 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr; 5429 array[DEVCONF_ACCEPT_RA_MIN_HOP_LIMIT] = cnf->accept_ra_min_hop_limit; 5430 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo; 5431 #ifdef CONFIG_IPV6_ROUTER_PREF 5432 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref; 5433 array[DEVCONF_RTR_PROBE_INTERVAL] = 5434 jiffies_to_msecs(cnf->rtr_probe_interval); 5435 #ifdef CONFIG_IPV6_ROUTE_INFO 5436 array[DEVCONF_ACCEPT_RA_RT_INFO_MIN_PLEN] = cnf->accept_ra_rt_info_min_plen; 5437 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen; 5438 #endif 5439 #endif 5440 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp; 5441 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route; 5442 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 5443 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad; 5444 array[DEVCONF_USE_OPTIMISTIC] = cnf->use_optimistic; 5445 #endif 5446 #ifdef CONFIG_IPV6_MROUTE 5447 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding; 5448 #endif 5449 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6; 5450 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad; 5451 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao; 5452 array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify; 5453 array[DEVCONF_SUPPRESS_FRAG_NDISC] = cnf->suppress_frag_ndisc; 5454 array[DEVCONF_ACCEPT_RA_FROM_LOCAL] = cnf->accept_ra_from_local; 5455 array[DEVCONF_ACCEPT_RA_MTU] = cnf->accept_ra_mtu; 5456 array[DEVCONF_IGNORE_ROUTES_WITH_LINKDOWN] = cnf->ignore_routes_with_linkdown; 5457 /* we omit DEVCONF_STABLE_SECRET for now */ 5458 array[DEVCONF_USE_OIF_ADDRS_ONLY] = cnf->use_oif_addrs_only; 5459 array[DEVCONF_DROP_UNICAST_IN_L2_MULTICAST] = cnf->drop_unicast_in_l2_multicast; 5460 array[DEVCONF_DROP_UNSOLICITED_NA] = cnf->drop_unsolicited_na; 5461 array[DEVCONF_KEEP_ADDR_ON_DOWN] = cnf->keep_addr_on_down; 5462 array[DEVCONF_SEG6_ENABLED] = cnf->seg6_enabled; 5463 #ifdef CONFIG_IPV6_SEG6_HMAC 5464 array[DEVCONF_SEG6_REQUIRE_HMAC] = cnf->seg6_require_hmac; 5465 #endif 5466 array[DEVCONF_ENHANCED_DAD] = cnf->enhanced_dad; 5467 array[DEVCONF_ADDR_GEN_MODE] = cnf->addr_gen_mode; 5468 array[DEVCONF_DISABLE_POLICY] = cnf->disable_policy; 5469 array[DEVCONF_NDISC_TCLASS] = cnf->ndisc_tclass; 5470 } 5471 5472 static inline size_t inet6_ifla6_size(void) 5473 { 5474 return nla_total_size(4) /* IFLA_INET6_FLAGS */ 5475 + nla_total_size(sizeof(struct ifla_cacheinfo)) 5476 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */ 5477 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */ 5478 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */ 5479 + nla_total_size(sizeof(struct in6_addr)) /* IFLA_INET6_TOKEN */ 5480 + nla_total_size(1) /* IFLA_INET6_ADDR_GEN_MODE */ 5481 + 0; 5482 } 5483 5484 static inline size_t inet6_if_nlmsg_size(void) 5485 { 5486 return NLMSG_ALIGN(sizeof(struct ifinfomsg)) 5487 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */ 5488 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */ 5489 + nla_total_size(4) /* IFLA_MTU */ 5490 + nla_total_size(4) /* IFLA_LINK */ 5491 + nla_total_size(1) /* IFLA_OPERSTATE */ 5492 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */ 5493 } 5494 5495 static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib, 5496 int bytes) 5497 { 5498 int i; 5499 int pad = bytes - sizeof(u64) * ICMP6_MIB_MAX; 5500 BUG_ON(pad < 0); 5501 5502 /* Use put_unaligned() because stats may not be aligned for u64. */ 5503 put_unaligned(ICMP6_MIB_MAX, &stats[0]); 5504 for (i = 1; i < ICMP6_MIB_MAX; i++) 5505 put_unaligned(atomic_long_read(&mib[i]), &stats[i]); 5506 5507 memset(&stats[ICMP6_MIB_MAX], 0, pad); 5508 } 5509 5510 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu *mib, 5511 int bytes, size_t syncpoff) 5512 { 5513 int i, c; 5514 u64 buff[IPSTATS_MIB_MAX]; 5515 int pad = bytes - sizeof(u64) * IPSTATS_MIB_MAX; 5516 5517 BUG_ON(pad < 0); 5518 5519 memset(buff, 0, sizeof(buff)); 5520 buff[0] = IPSTATS_MIB_MAX; 5521 5522 for_each_possible_cpu(c) { 5523 for (i = 1; i < IPSTATS_MIB_MAX; i++) 5524 buff[i] += snmp_get_cpu_field64(mib, c, i, syncpoff); 5525 } 5526 5527 memcpy(stats, buff, IPSTATS_MIB_MAX * sizeof(u64)); 5528 memset(&stats[IPSTATS_MIB_MAX], 0, pad); 5529 } 5530 5531 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype, 5532 int bytes) 5533 { 5534 switch (attrtype) { 5535 case IFLA_INET6_STATS: 5536 __snmp6_fill_stats64(stats, idev->stats.ipv6, bytes, 5537 offsetof(struct ipstats_mib, syncp)); 5538 break; 5539 case IFLA_INET6_ICMP6STATS: 5540 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, bytes); 5541 break; 5542 } 5543 } 5544 5545 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev, 5546 u32 ext_filter_mask) 5547 { 5548 struct nlattr *nla; 5549 struct ifla_cacheinfo ci; 5550 5551 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags)) 5552 goto nla_put_failure; 5553 ci.max_reasm_len = IPV6_MAXPLEN; 5554 ci.tstamp = cstamp_delta(idev->tstamp); 5555 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time); 5556 ci.retrans_time = jiffies_to_msecs(NEIGH_VAR(idev->nd_parms, RETRANS_TIME)); 5557 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci)) 5558 goto nla_put_failure; 5559 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32)); 5560 if (!nla) 5561 goto nla_put_failure; 5562 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla)); 5563 5564 /* XXX - MC not implemented */ 5565 5566 if (ext_filter_mask & RTEXT_FILTER_SKIP_STATS) 5567 return 0; 5568 5569 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64)); 5570 if (!nla) 5571 goto nla_put_failure; 5572 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla)); 5573 5574 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64)); 5575 if (!nla) 5576 goto nla_put_failure; 5577 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla)); 5578 5579 nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr)); 5580 if (!nla) 5581 goto nla_put_failure; 5582 read_lock_bh(&idev->lock); 5583 memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla)); 5584 read_unlock_bh(&idev->lock); 5585 5586 if (nla_put_u8(skb, IFLA_INET6_ADDR_GEN_MODE, idev->cnf.addr_gen_mode)) 5587 goto nla_put_failure; 5588 5589 return 0; 5590 5591 nla_put_failure: 5592 return -EMSGSIZE; 5593 } 5594 5595 static size_t inet6_get_link_af_size(const struct net_device *dev, 5596 u32 ext_filter_mask) 5597 { 5598 if (!__in6_dev_get(dev)) 5599 return 0; 5600 5601 return inet6_ifla6_size(); 5602 } 5603 5604 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev, 5605 u32 ext_filter_mask) 5606 { 5607 struct inet6_dev *idev = __in6_dev_get(dev); 5608 5609 if (!idev) 5610 return -ENODATA; 5611 5612 if (inet6_fill_ifla6_attrs(skb, idev, ext_filter_mask) < 0) 5613 return -EMSGSIZE; 5614 5615 return 0; 5616 } 5617 5618 static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token) 5619 { 5620 struct inet6_ifaddr *ifp; 5621 struct net_device *dev = idev->dev; 5622 bool clear_token, update_rs = false; 5623 struct in6_addr ll_addr; 5624 5625 ASSERT_RTNL(); 5626 5627 if (!token) 5628 return -EINVAL; 5629 if (dev->flags & (IFF_LOOPBACK | IFF_NOARP)) 5630 return -EINVAL; 5631 if (!ipv6_accept_ra(idev)) 5632 return -EINVAL; 5633 if (idev->cnf.rtr_solicits == 0) 5634 return -EINVAL; 5635 5636 write_lock_bh(&idev->lock); 5637 5638 BUILD_BUG_ON(sizeof(token->s6_addr) != 16); 5639 memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8); 5640 5641 write_unlock_bh(&idev->lock); 5642 5643 clear_token = ipv6_addr_any(token); 5644 if (clear_token) 5645 goto update_lft; 5646 5647 if (!idev->dead && (idev->if_flags & IF_READY) && 5648 !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE | 5649 IFA_F_OPTIMISTIC)) { 5650 /* If we're not ready, then normal ifup will take care 5651 * of this. Otherwise, we need to request our rs here. 5652 */ 5653 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters); 5654 update_rs = true; 5655 } 5656 5657 update_lft: 5658 write_lock_bh(&idev->lock); 5659 5660 if (update_rs) { 5661 idev->if_flags |= IF_RS_SENT; 5662 idev->rs_interval = rfc3315_s14_backoff_init( 5663 idev->cnf.rtr_solicit_interval); 5664 idev->rs_probes = 1; 5665 addrconf_mod_rs_timer(idev, idev->rs_interval); 5666 } 5667 5668 /* Well, that's kinda nasty ... */ 5669 list_for_each_entry(ifp, &idev->addr_list, if_list) { 5670 spin_lock(&ifp->lock); 5671 if (ifp->tokenized) { 5672 ifp->valid_lft = 0; 5673 ifp->prefered_lft = 0; 5674 } 5675 spin_unlock(&ifp->lock); 5676 } 5677 5678 write_unlock_bh(&idev->lock); 5679 inet6_ifinfo_notify(RTM_NEWLINK, idev); 5680 addrconf_verify_rtnl(); 5681 return 0; 5682 } 5683 5684 static const struct nla_policy inet6_af_policy[IFLA_INET6_MAX + 1] = { 5685 [IFLA_INET6_ADDR_GEN_MODE] = { .type = NLA_U8 }, 5686 [IFLA_INET6_TOKEN] = { .len = sizeof(struct in6_addr) }, 5687 }; 5688 5689 static int check_addr_gen_mode(int mode) 5690 { 5691 if (mode != IN6_ADDR_GEN_MODE_EUI64 && 5692 mode != IN6_ADDR_GEN_MODE_NONE && 5693 mode != IN6_ADDR_GEN_MODE_STABLE_PRIVACY && 5694 mode != IN6_ADDR_GEN_MODE_RANDOM) 5695 return -EINVAL; 5696 return 1; 5697 } 5698 5699 static int check_stable_privacy(struct inet6_dev *idev, struct net *net, 5700 int mode) 5701 { 5702 if (mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY && 5703 !idev->cnf.stable_secret.initialized && 5704 !net->ipv6.devconf_dflt->stable_secret.initialized) 5705 return -EINVAL; 5706 return 1; 5707 } 5708 5709 static int inet6_validate_link_af(const struct net_device *dev, 5710 const struct nlattr *nla) 5711 { 5712 struct nlattr *tb[IFLA_INET6_MAX + 1]; 5713 struct inet6_dev *idev = NULL; 5714 int err; 5715 5716 if (dev) { 5717 idev = __in6_dev_get(dev); 5718 if (!idev) 5719 return -EAFNOSUPPORT; 5720 } 5721 5722 err = nla_parse_nested_deprecated(tb, IFLA_INET6_MAX, nla, 5723 inet6_af_policy, NULL); 5724 if (err) 5725 return err; 5726 5727 if (!tb[IFLA_INET6_TOKEN] && !tb[IFLA_INET6_ADDR_GEN_MODE]) 5728 return -EINVAL; 5729 5730 if (tb[IFLA_INET6_ADDR_GEN_MODE]) { 5731 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]); 5732 5733 if (check_addr_gen_mode(mode) < 0) 5734 return -EINVAL; 5735 if (dev && check_stable_privacy(idev, dev_net(dev), mode) < 0) 5736 return -EINVAL; 5737 } 5738 5739 return 0; 5740 } 5741 5742 static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla) 5743 { 5744 struct inet6_dev *idev = __in6_dev_get(dev); 5745 struct nlattr *tb[IFLA_INET6_MAX + 1]; 5746 int err; 5747 5748 if (!idev) 5749 return -EAFNOSUPPORT; 5750 5751 if (nla_parse_nested_deprecated(tb, IFLA_INET6_MAX, nla, NULL, NULL) < 0) 5752 BUG(); 5753 5754 if (tb[IFLA_INET6_TOKEN]) { 5755 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN])); 5756 if (err) 5757 return err; 5758 } 5759 5760 if (tb[IFLA_INET6_ADDR_GEN_MODE]) { 5761 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]); 5762 5763 idev->cnf.addr_gen_mode = mode; 5764 } 5765 5766 return 0; 5767 } 5768 5769 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev, 5770 u32 portid, u32 seq, int event, unsigned int flags) 5771 { 5772 struct net_device *dev = idev->dev; 5773 struct ifinfomsg *hdr; 5774 struct nlmsghdr *nlh; 5775 void *protoinfo; 5776 5777 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags); 5778 if (!nlh) 5779 return -EMSGSIZE; 5780 5781 hdr = nlmsg_data(nlh); 5782 hdr->ifi_family = AF_INET6; 5783 hdr->__ifi_pad = 0; 5784 hdr->ifi_type = dev->type; 5785 hdr->ifi_index = dev->ifindex; 5786 hdr->ifi_flags = dev_get_flags(dev); 5787 hdr->ifi_change = 0; 5788 5789 if (nla_put_string(skb, IFLA_IFNAME, dev->name) || 5790 (dev->addr_len && 5791 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) || 5792 nla_put_u32(skb, IFLA_MTU, dev->mtu) || 5793 (dev->ifindex != dev_get_iflink(dev) && 5794 nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))) || 5795 nla_put_u8(skb, IFLA_OPERSTATE, 5796 netif_running(dev) ? dev->operstate : IF_OPER_DOWN)) 5797 goto nla_put_failure; 5798 protoinfo = nla_nest_start_noflag(skb, IFLA_PROTINFO); 5799 if (!protoinfo) 5800 goto nla_put_failure; 5801 5802 if (inet6_fill_ifla6_attrs(skb, idev, 0) < 0) 5803 goto nla_put_failure; 5804 5805 nla_nest_end(skb, protoinfo); 5806 nlmsg_end(skb, nlh); 5807 return 0; 5808 5809 nla_put_failure: 5810 nlmsg_cancel(skb, nlh); 5811 return -EMSGSIZE; 5812 } 5813 5814 static int inet6_valid_dump_ifinfo(const struct nlmsghdr *nlh, 5815 struct netlink_ext_ack *extack) 5816 { 5817 struct ifinfomsg *ifm; 5818 5819 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) { 5820 NL_SET_ERR_MSG_MOD(extack, "Invalid header for link dump request"); 5821 return -EINVAL; 5822 } 5823 5824 if (nlmsg_attrlen(nlh, sizeof(*ifm))) { 5825 NL_SET_ERR_MSG_MOD(extack, "Invalid data after header"); 5826 return -EINVAL; 5827 } 5828 5829 ifm = nlmsg_data(nlh); 5830 if (ifm->__ifi_pad || ifm->ifi_type || ifm->ifi_flags || 5831 ifm->ifi_change || ifm->ifi_index) { 5832 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for dump request"); 5833 return -EINVAL; 5834 } 5835 5836 return 0; 5837 } 5838 5839 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb) 5840 { 5841 struct net *net = sock_net(skb->sk); 5842 int h, s_h; 5843 int idx = 0, s_idx; 5844 struct net_device *dev; 5845 struct inet6_dev *idev; 5846 struct hlist_head *head; 5847 5848 /* only requests using strict checking can pass data to 5849 * influence the dump 5850 */ 5851 if (cb->strict_check) { 5852 int err = inet6_valid_dump_ifinfo(cb->nlh, cb->extack); 5853 5854 if (err < 0) 5855 return err; 5856 } 5857 5858 s_h = cb->args[0]; 5859 s_idx = cb->args[1]; 5860 5861 rcu_read_lock(); 5862 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 5863 idx = 0; 5864 head = &net->dev_index_head[h]; 5865 hlist_for_each_entry_rcu(dev, head, index_hlist) { 5866 if (idx < s_idx) 5867 goto cont; 5868 idev = __in6_dev_get(dev); 5869 if (!idev) 5870 goto cont; 5871 if (inet6_fill_ifinfo(skb, idev, 5872 NETLINK_CB(cb->skb).portid, 5873 cb->nlh->nlmsg_seq, 5874 RTM_NEWLINK, NLM_F_MULTI) < 0) 5875 goto out; 5876 cont: 5877 idx++; 5878 } 5879 } 5880 out: 5881 rcu_read_unlock(); 5882 cb->args[1] = idx; 5883 cb->args[0] = h; 5884 5885 return skb->len; 5886 } 5887 5888 void inet6_ifinfo_notify(int event, struct inet6_dev *idev) 5889 { 5890 struct sk_buff *skb; 5891 struct net *net = dev_net(idev->dev); 5892 int err = -ENOBUFS; 5893 5894 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC); 5895 if (!skb) 5896 goto errout; 5897 5898 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0); 5899 if (err < 0) { 5900 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */ 5901 WARN_ON(err == -EMSGSIZE); 5902 kfree_skb(skb); 5903 goto errout; 5904 } 5905 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC); 5906 return; 5907 errout: 5908 if (err < 0) 5909 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err); 5910 } 5911 5912 static inline size_t inet6_prefix_nlmsg_size(void) 5913 { 5914 return NLMSG_ALIGN(sizeof(struct prefixmsg)) 5915 + nla_total_size(sizeof(struct in6_addr)) 5916 + nla_total_size(sizeof(struct prefix_cacheinfo)); 5917 } 5918 5919 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev, 5920 struct prefix_info *pinfo, u32 portid, u32 seq, 5921 int event, unsigned int flags) 5922 { 5923 struct prefixmsg *pmsg; 5924 struct nlmsghdr *nlh; 5925 struct prefix_cacheinfo ci; 5926 5927 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags); 5928 if (!nlh) 5929 return -EMSGSIZE; 5930 5931 pmsg = nlmsg_data(nlh); 5932 pmsg->prefix_family = AF_INET6; 5933 pmsg->prefix_pad1 = 0; 5934 pmsg->prefix_pad2 = 0; 5935 pmsg->prefix_ifindex = idev->dev->ifindex; 5936 pmsg->prefix_len = pinfo->prefix_len; 5937 pmsg->prefix_type = pinfo->type; 5938 pmsg->prefix_pad3 = 0; 5939 pmsg->prefix_flags = 0; 5940 if (pinfo->onlink) 5941 pmsg->prefix_flags |= IF_PREFIX_ONLINK; 5942 if (pinfo->autoconf) 5943 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF; 5944 5945 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix)) 5946 goto nla_put_failure; 5947 ci.preferred_time = ntohl(pinfo->prefered); 5948 ci.valid_time = ntohl(pinfo->valid); 5949 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci)) 5950 goto nla_put_failure; 5951 nlmsg_end(skb, nlh); 5952 return 0; 5953 5954 nla_put_failure: 5955 nlmsg_cancel(skb, nlh); 5956 return -EMSGSIZE; 5957 } 5958 5959 static void inet6_prefix_notify(int event, struct inet6_dev *idev, 5960 struct prefix_info *pinfo) 5961 { 5962 struct sk_buff *skb; 5963 struct net *net = dev_net(idev->dev); 5964 int err = -ENOBUFS; 5965 5966 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC); 5967 if (!skb) 5968 goto errout; 5969 5970 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0); 5971 if (err < 0) { 5972 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */ 5973 WARN_ON(err == -EMSGSIZE); 5974 kfree_skb(skb); 5975 goto errout; 5976 } 5977 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC); 5978 return; 5979 errout: 5980 if (err < 0) 5981 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err); 5982 } 5983 5984 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 5985 { 5986 struct net *net = dev_net(ifp->idev->dev); 5987 5988 if (event) 5989 ASSERT_RTNL(); 5990 5991 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp); 5992 5993 switch (event) { 5994 case RTM_NEWADDR: 5995 /* 5996 * If the address was optimistic we inserted the route at the 5997 * start of our DAD process, so we don't need to do it again. 5998 * If the device was taken down in the middle of the DAD 5999 * cycle there is a race where we could get here without a 6000 * host route, so nothing to insert. That will be fixed when 6001 * the device is brought up. 6002 */ 6003 if (ifp->rt && !rcu_access_pointer(ifp->rt->fib6_node)) { 6004 ip6_ins_rt(net, ifp->rt); 6005 } else if (!ifp->rt && (ifp->idev->dev->flags & IFF_UP)) { 6006 pr_warn("BUG: Address %pI6c on device %s is missing its host route.\n", 6007 &ifp->addr, ifp->idev->dev->name); 6008 } 6009 6010 if (ifp->idev->cnf.forwarding) 6011 addrconf_join_anycast(ifp); 6012 if (!ipv6_addr_any(&ifp->peer_addr)) 6013 addrconf_prefix_route(&ifp->peer_addr, 128, 6014 ifp->rt_priority, ifp->idev->dev, 6015 0, 0, GFP_ATOMIC); 6016 break; 6017 case RTM_DELADDR: 6018 if (ifp->idev->cnf.forwarding) 6019 addrconf_leave_anycast(ifp); 6020 addrconf_leave_solict(ifp->idev, &ifp->addr); 6021 if (!ipv6_addr_any(&ifp->peer_addr)) { 6022 struct fib6_info *rt; 6023 6024 rt = addrconf_get_prefix_route(&ifp->peer_addr, 128, 6025 ifp->idev->dev, 0, 0, 6026 false); 6027 if (rt) 6028 ip6_del_rt(net, rt); 6029 } 6030 if (ifp->rt) { 6031 ip6_del_rt(net, ifp->rt); 6032 ifp->rt = NULL; 6033 } 6034 rt_genid_bump_ipv6(net); 6035 break; 6036 } 6037 atomic_inc(&net->ipv6.dev_addr_genid); 6038 } 6039 6040 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 6041 { 6042 rcu_read_lock_bh(); 6043 if (likely(ifp->idev->dead == 0)) 6044 __ipv6_ifa_notify(event, ifp); 6045 rcu_read_unlock_bh(); 6046 } 6047 6048 #ifdef CONFIG_SYSCTL 6049 6050 static 6051 int addrconf_sysctl_forward(struct ctl_table *ctl, int write, 6052 void __user *buffer, size_t *lenp, loff_t *ppos) 6053 { 6054 int *valp = ctl->data; 6055 int val = *valp; 6056 loff_t pos = *ppos; 6057 struct ctl_table lctl; 6058 int ret; 6059 6060 /* 6061 * ctl->data points to idev->cnf.forwarding, we should 6062 * not modify it until we get the rtnl lock. 6063 */ 6064 lctl = *ctl; 6065 lctl.data = &val; 6066 6067 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 6068 6069 if (write) 6070 ret = addrconf_fixup_forwarding(ctl, valp, val); 6071 if (ret) 6072 *ppos = pos; 6073 return ret; 6074 } 6075 6076 static 6077 int addrconf_sysctl_mtu(struct ctl_table *ctl, int write, 6078 void __user *buffer, size_t *lenp, loff_t *ppos) 6079 { 6080 struct inet6_dev *idev = ctl->extra1; 6081 int min_mtu = IPV6_MIN_MTU; 6082 struct ctl_table lctl; 6083 6084 lctl = *ctl; 6085 lctl.extra1 = &min_mtu; 6086 lctl.extra2 = idev ? &idev->dev->mtu : NULL; 6087 6088 return proc_dointvec_minmax(&lctl, write, buffer, lenp, ppos); 6089 } 6090 6091 static void dev_disable_change(struct inet6_dev *idev) 6092 { 6093 struct netdev_notifier_info info; 6094 6095 if (!idev || !idev->dev) 6096 return; 6097 6098 netdev_notifier_info_init(&info, idev->dev); 6099 if (idev->cnf.disable_ipv6) 6100 addrconf_notify(NULL, NETDEV_DOWN, &info); 6101 else 6102 addrconf_notify(NULL, NETDEV_UP, &info); 6103 } 6104 6105 static void addrconf_disable_change(struct net *net, __s32 newf) 6106 { 6107 struct net_device *dev; 6108 struct inet6_dev *idev; 6109 6110 for_each_netdev(net, dev) { 6111 idev = __in6_dev_get(dev); 6112 if (idev) { 6113 int changed = (!idev->cnf.disable_ipv6) ^ (!newf); 6114 idev->cnf.disable_ipv6 = newf; 6115 if (changed) 6116 dev_disable_change(idev); 6117 } 6118 } 6119 } 6120 6121 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf) 6122 { 6123 struct net *net; 6124 int old; 6125 6126 if (!rtnl_trylock()) 6127 return restart_syscall(); 6128 6129 net = (struct net *)table->extra2; 6130 old = *p; 6131 *p = newf; 6132 6133 if (p == &net->ipv6.devconf_dflt->disable_ipv6) { 6134 rtnl_unlock(); 6135 return 0; 6136 } 6137 6138 if (p == &net->ipv6.devconf_all->disable_ipv6) { 6139 net->ipv6.devconf_dflt->disable_ipv6 = newf; 6140 addrconf_disable_change(net, newf); 6141 } else if ((!newf) ^ (!old)) 6142 dev_disable_change((struct inet6_dev *)table->extra1); 6143 6144 rtnl_unlock(); 6145 return 0; 6146 } 6147 6148 static 6149 int addrconf_sysctl_disable(struct ctl_table *ctl, int write, 6150 void __user *buffer, size_t *lenp, loff_t *ppos) 6151 { 6152 int *valp = ctl->data; 6153 int val = *valp; 6154 loff_t pos = *ppos; 6155 struct ctl_table lctl; 6156 int ret; 6157 6158 /* 6159 * ctl->data points to idev->cnf.disable_ipv6, we should 6160 * not modify it until we get the rtnl lock. 6161 */ 6162 lctl = *ctl; 6163 lctl.data = &val; 6164 6165 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 6166 6167 if (write) 6168 ret = addrconf_disable_ipv6(ctl, valp, val); 6169 if (ret) 6170 *ppos = pos; 6171 return ret; 6172 } 6173 6174 static 6175 int addrconf_sysctl_proxy_ndp(struct ctl_table *ctl, int write, 6176 void __user *buffer, size_t *lenp, loff_t *ppos) 6177 { 6178 int *valp = ctl->data; 6179 int ret; 6180 int old, new; 6181 6182 old = *valp; 6183 ret = proc_dointvec(ctl, write, buffer, lenp, ppos); 6184 new = *valp; 6185 6186 if (write && old != new) { 6187 struct net *net = ctl->extra2; 6188 6189 if (!rtnl_trylock()) 6190 return restart_syscall(); 6191 6192 if (valp == &net->ipv6.devconf_dflt->proxy_ndp) 6193 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 6194 NETCONFA_PROXY_NEIGH, 6195 NETCONFA_IFINDEX_DEFAULT, 6196 net->ipv6.devconf_dflt); 6197 else if (valp == &net->ipv6.devconf_all->proxy_ndp) 6198 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 6199 NETCONFA_PROXY_NEIGH, 6200 NETCONFA_IFINDEX_ALL, 6201 net->ipv6.devconf_all); 6202 else { 6203 struct inet6_dev *idev = ctl->extra1; 6204 6205 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 6206 NETCONFA_PROXY_NEIGH, 6207 idev->dev->ifindex, 6208 &idev->cnf); 6209 } 6210 rtnl_unlock(); 6211 } 6212 6213 return ret; 6214 } 6215 6216 static int addrconf_sysctl_addr_gen_mode(struct ctl_table *ctl, int write, 6217 void __user *buffer, size_t *lenp, 6218 loff_t *ppos) 6219 { 6220 int ret = 0; 6221 u32 new_val; 6222 struct inet6_dev *idev = (struct inet6_dev *)ctl->extra1; 6223 struct net *net = (struct net *)ctl->extra2; 6224 struct ctl_table tmp = { 6225 .data = &new_val, 6226 .maxlen = sizeof(new_val), 6227 .mode = ctl->mode, 6228 }; 6229 6230 if (!rtnl_trylock()) 6231 return restart_syscall(); 6232 6233 new_val = *((u32 *)ctl->data); 6234 6235 ret = proc_douintvec(&tmp, write, buffer, lenp, ppos); 6236 if (ret != 0) 6237 goto out; 6238 6239 if (write) { 6240 if (check_addr_gen_mode(new_val) < 0) { 6241 ret = -EINVAL; 6242 goto out; 6243 } 6244 6245 if (idev) { 6246 if (check_stable_privacy(idev, net, new_val) < 0) { 6247 ret = -EINVAL; 6248 goto out; 6249 } 6250 6251 if (idev->cnf.addr_gen_mode != new_val) { 6252 idev->cnf.addr_gen_mode = new_val; 6253 addrconf_dev_config(idev->dev); 6254 } 6255 } else if (&net->ipv6.devconf_all->addr_gen_mode == ctl->data) { 6256 struct net_device *dev; 6257 6258 net->ipv6.devconf_dflt->addr_gen_mode = new_val; 6259 for_each_netdev(net, dev) { 6260 idev = __in6_dev_get(dev); 6261 if (idev && 6262 idev->cnf.addr_gen_mode != new_val) { 6263 idev->cnf.addr_gen_mode = new_val; 6264 addrconf_dev_config(idev->dev); 6265 } 6266 } 6267 } 6268 6269 *((u32 *)ctl->data) = new_val; 6270 } 6271 6272 out: 6273 rtnl_unlock(); 6274 6275 return ret; 6276 } 6277 6278 static int addrconf_sysctl_stable_secret(struct ctl_table *ctl, int write, 6279 void __user *buffer, size_t *lenp, 6280 loff_t *ppos) 6281 { 6282 int err; 6283 struct in6_addr addr; 6284 char str[IPV6_MAX_STRLEN]; 6285 struct ctl_table lctl = *ctl; 6286 struct net *net = ctl->extra2; 6287 struct ipv6_stable_secret *secret = ctl->data; 6288 6289 if (&net->ipv6.devconf_all->stable_secret == ctl->data) 6290 return -EIO; 6291 6292 lctl.maxlen = IPV6_MAX_STRLEN; 6293 lctl.data = str; 6294 6295 if (!rtnl_trylock()) 6296 return restart_syscall(); 6297 6298 if (!write && !secret->initialized) { 6299 err = -EIO; 6300 goto out; 6301 } 6302 6303 err = snprintf(str, sizeof(str), "%pI6", &secret->secret); 6304 if (err >= sizeof(str)) { 6305 err = -EIO; 6306 goto out; 6307 } 6308 6309 err = proc_dostring(&lctl, write, buffer, lenp, ppos); 6310 if (err || !write) 6311 goto out; 6312 6313 if (in6_pton(str, -1, addr.in6_u.u6_addr8, -1, NULL) != 1) { 6314 err = -EIO; 6315 goto out; 6316 } 6317 6318 secret->initialized = true; 6319 secret->secret = addr; 6320 6321 if (&net->ipv6.devconf_dflt->stable_secret == ctl->data) { 6322 struct net_device *dev; 6323 6324 for_each_netdev(net, dev) { 6325 struct inet6_dev *idev = __in6_dev_get(dev); 6326 6327 if (idev) { 6328 idev->cnf.addr_gen_mode = 6329 IN6_ADDR_GEN_MODE_STABLE_PRIVACY; 6330 } 6331 } 6332 } else { 6333 struct inet6_dev *idev = ctl->extra1; 6334 6335 idev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY; 6336 } 6337 6338 out: 6339 rtnl_unlock(); 6340 6341 return err; 6342 } 6343 6344 static 6345 int addrconf_sysctl_ignore_routes_with_linkdown(struct ctl_table *ctl, 6346 int write, 6347 void __user *buffer, 6348 size_t *lenp, 6349 loff_t *ppos) 6350 { 6351 int *valp = ctl->data; 6352 int val = *valp; 6353 loff_t pos = *ppos; 6354 struct ctl_table lctl; 6355 int ret; 6356 6357 /* ctl->data points to idev->cnf.ignore_routes_when_linkdown 6358 * we should not modify it until we get the rtnl lock. 6359 */ 6360 lctl = *ctl; 6361 lctl.data = &val; 6362 6363 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 6364 6365 if (write) 6366 ret = addrconf_fixup_linkdown(ctl, valp, val); 6367 if (ret) 6368 *ppos = pos; 6369 return ret; 6370 } 6371 6372 static 6373 void addrconf_set_nopolicy(struct rt6_info *rt, int action) 6374 { 6375 if (rt) { 6376 if (action) 6377 rt->dst.flags |= DST_NOPOLICY; 6378 else 6379 rt->dst.flags &= ~DST_NOPOLICY; 6380 } 6381 } 6382 6383 static 6384 void addrconf_disable_policy_idev(struct inet6_dev *idev, int val) 6385 { 6386 struct inet6_ifaddr *ifa; 6387 6388 read_lock_bh(&idev->lock); 6389 list_for_each_entry(ifa, &idev->addr_list, if_list) { 6390 spin_lock(&ifa->lock); 6391 if (ifa->rt) { 6392 /* host routes only use builtin fib6_nh */ 6393 struct fib6_nh *nh = ifa->rt->fib6_nh; 6394 int cpu; 6395 6396 rcu_read_lock(); 6397 ifa->rt->dst_nopolicy = val ? true : false; 6398 if (nh->rt6i_pcpu) { 6399 for_each_possible_cpu(cpu) { 6400 struct rt6_info **rtp; 6401 6402 rtp = per_cpu_ptr(nh->rt6i_pcpu, cpu); 6403 addrconf_set_nopolicy(*rtp, val); 6404 } 6405 } 6406 rcu_read_unlock(); 6407 } 6408 spin_unlock(&ifa->lock); 6409 } 6410 read_unlock_bh(&idev->lock); 6411 } 6412 6413 static 6414 int addrconf_disable_policy(struct ctl_table *ctl, int *valp, int val) 6415 { 6416 struct inet6_dev *idev; 6417 struct net *net; 6418 6419 if (!rtnl_trylock()) 6420 return restart_syscall(); 6421 6422 *valp = val; 6423 6424 net = (struct net *)ctl->extra2; 6425 if (valp == &net->ipv6.devconf_dflt->disable_policy) { 6426 rtnl_unlock(); 6427 return 0; 6428 } 6429 6430 if (valp == &net->ipv6.devconf_all->disable_policy) { 6431 struct net_device *dev; 6432 6433 for_each_netdev(net, dev) { 6434 idev = __in6_dev_get(dev); 6435 if (idev) 6436 addrconf_disable_policy_idev(idev, val); 6437 } 6438 } else { 6439 idev = (struct inet6_dev *)ctl->extra1; 6440 addrconf_disable_policy_idev(idev, val); 6441 } 6442 6443 rtnl_unlock(); 6444 return 0; 6445 } 6446 6447 static 6448 int addrconf_sysctl_disable_policy(struct ctl_table *ctl, int write, 6449 void __user *buffer, size_t *lenp, 6450 loff_t *ppos) 6451 { 6452 int *valp = ctl->data; 6453 int val = *valp; 6454 loff_t pos = *ppos; 6455 struct ctl_table lctl; 6456 int ret; 6457 6458 lctl = *ctl; 6459 lctl.data = &val; 6460 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 6461 6462 if (write && (*valp != val)) 6463 ret = addrconf_disable_policy(ctl, valp, val); 6464 6465 if (ret) 6466 *ppos = pos; 6467 6468 return ret; 6469 } 6470 6471 static int minus_one = -1; 6472 static const int two_five_five = 255; 6473 6474 static const struct ctl_table addrconf_sysctl[] = { 6475 { 6476 .procname = "forwarding", 6477 .data = &ipv6_devconf.forwarding, 6478 .maxlen = sizeof(int), 6479 .mode = 0644, 6480 .proc_handler = addrconf_sysctl_forward, 6481 }, 6482 { 6483 .procname = "hop_limit", 6484 .data = &ipv6_devconf.hop_limit, 6485 .maxlen = sizeof(int), 6486 .mode = 0644, 6487 .proc_handler = proc_dointvec_minmax, 6488 .extra1 = (void *)SYSCTL_ONE, 6489 .extra2 = (void *)&two_five_five, 6490 }, 6491 { 6492 .procname = "mtu", 6493 .data = &ipv6_devconf.mtu6, 6494 .maxlen = sizeof(int), 6495 .mode = 0644, 6496 .proc_handler = addrconf_sysctl_mtu, 6497 }, 6498 { 6499 .procname = "accept_ra", 6500 .data = &ipv6_devconf.accept_ra, 6501 .maxlen = sizeof(int), 6502 .mode = 0644, 6503 .proc_handler = proc_dointvec, 6504 }, 6505 { 6506 .procname = "accept_redirects", 6507 .data = &ipv6_devconf.accept_redirects, 6508 .maxlen = sizeof(int), 6509 .mode = 0644, 6510 .proc_handler = proc_dointvec, 6511 }, 6512 { 6513 .procname = "autoconf", 6514 .data = &ipv6_devconf.autoconf, 6515 .maxlen = sizeof(int), 6516 .mode = 0644, 6517 .proc_handler = proc_dointvec, 6518 }, 6519 { 6520 .procname = "dad_transmits", 6521 .data = &ipv6_devconf.dad_transmits, 6522 .maxlen = sizeof(int), 6523 .mode = 0644, 6524 .proc_handler = proc_dointvec, 6525 }, 6526 { 6527 .procname = "router_solicitations", 6528 .data = &ipv6_devconf.rtr_solicits, 6529 .maxlen = sizeof(int), 6530 .mode = 0644, 6531 .proc_handler = proc_dointvec_minmax, 6532 .extra1 = &minus_one, 6533 }, 6534 { 6535 .procname = "router_solicitation_interval", 6536 .data = &ipv6_devconf.rtr_solicit_interval, 6537 .maxlen = sizeof(int), 6538 .mode = 0644, 6539 .proc_handler = proc_dointvec_jiffies, 6540 }, 6541 { 6542 .procname = "router_solicitation_max_interval", 6543 .data = &ipv6_devconf.rtr_solicit_max_interval, 6544 .maxlen = sizeof(int), 6545 .mode = 0644, 6546 .proc_handler = proc_dointvec_jiffies, 6547 }, 6548 { 6549 .procname = "router_solicitation_delay", 6550 .data = &ipv6_devconf.rtr_solicit_delay, 6551 .maxlen = sizeof(int), 6552 .mode = 0644, 6553 .proc_handler = proc_dointvec_jiffies, 6554 }, 6555 { 6556 .procname = "force_mld_version", 6557 .data = &ipv6_devconf.force_mld_version, 6558 .maxlen = sizeof(int), 6559 .mode = 0644, 6560 .proc_handler = proc_dointvec, 6561 }, 6562 { 6563 .procname = "mldv1_unsolicited_report_interval", 6564 .data = 6565 &ipv6_devconf.mldv1_unsolicited_report_interval, 6566 .maxlen = sizeof(int), 6567 .mode = 0644, 6568 .proc_handler = proc_dointvec_ms_jiffies, 6569 }, 6570 { 6571 .procname = "mldv2_unsolicited_report_interval", 6572 .data = 6573 &ipv6_devconf.mldv2_unsolicited_report_interval, 6574 .maxlen = sizeof(int), 6575 .mode = 0644, 6576 .proc_handler = proc_dointvec_ms_jiffies, 6577 }, 6578 { 6579 .procname = "use_tempaddr", 6580 .data = &ipv6_devconf.use_tempaddr, 6581 .maxlen = sizeof(int), 6582 .mode = 0644, 6583 .proc_handler = proc_dointvec, 6584 }, 6585 { 6586 .procname = "temp_valid_lft", 6587 .data = &ipv6_devconf.temp_valid_lft, 6588 .maxlen = sizeof(int), 6589 .mode = 0644, 6590 .proc_handler = proc_dointvec, 6591 }, 6592 { 6593 .procname = "temp_prefered_lft", 6594 .data = &ipv6_devconf.temp_prefered_lft, 6595 .maxlen = sizeof(int), 6596 .mode = 0644, 6597 .proc_handler = proc_dointvec, 6598 }, 6599 { 6600 .procname = "regen_max_retry", 6601 .data = &ipv6_devconf.regen_max_retry, 6602 .maxlen = sizeof(int), 6603 .mode = 0644, 6604 .proc_handler = proc_dointvec, 6605 }, 6606 { 6607 .procname = "max_desync_factor", 6608 .data = &ipv6_devconf.max_desync_factor, 6609 .maxlen = sizeof(int), 6610 .mode = 0644, 6611 .proc_handler = proc_dointvec, 6612 }, 6613 { 6614 .procname = "max_addresses", 6615 .data = &ipv6_devconf.max_addresses, 6616 .maxlen = sizeof(int), 6617 .mode = 0644, 6618 .proc_handler = proc_dointvec, 6619 }, 6620 { 6621 .procname = "accept_ra_defrtr", 6622 .data = &ipv6_devconf.accept_ra_defrtr, 6623 .maxlen = sizeof(int), 6624 .mode = 0644, 6625 .proc_handler = proc_dointvec, 6626 }, 6627 { 6628 .procname = "accept_ra_min_hop_limit", 6629 .data = &ipv6_devconf.accept_ra_min_hop_limit, 6630 .maxlen = sizeof(int), 6631 .mode = 0644, 6632 .proc_handler = proc_dointvec, 6633 }, 6634 { 6635 .procname = "accept_ra_pinfo", 6636 .data = &ipv6_devconf.accept_ra_pinfo, 6637 .maxlen = sizeof(int), 6638 .mode = 0644, 6639 .proc_handler = proc_dointvec, 6640 }, 6641 #ifdef CONFIG_IPV6_ROUTER_PREF 6642 { 6643 .procname = "accept_ra_rtr_pref", 6644 .data = &ipv6_devconf.accept_ra_rtr_pref, 6645 .maxlen = sizeof(int), 6646 .mode = 0644, 6647 .proc_handler = proc_dointvec, 6648 }, 6649 { 6650 .procname = "router_probe_interval", 6651 .data = &ipv6_devconf.rtr_probe_interval, 6652 .maxlen = sizeof(int), 6653 .mode = 0644, 6654 .proc_handler = proc_dointvec_jiffies, 6655 }, 6656 #ifdef CONFIG_IPV6_ROUTE_INFO 6657 { 6658 .procname = "accept_ra_rt_info_min_plen", 6659 .data = &ipv6_devconf.accept_ra_rt_info_min_plen, 6660 .maxlen = sizeof(int), 6661 .mode = 0644, 6662 .proc_handler = proc_dointvec, 6663 }, 6664 { 6665 .procname = "accept_ra_rt_info_max_plen", 6666 .data = &ipv6_devconf.accept_ra_rt_info_max_plen, 6667 .maxlen = sizeof(int), 6668 .mode = 0644, 6669 .proc_handler = proc_dointvec, 6670 }, 6671 #endif 6672 #endif 6673 { 6674 .procname = "proxy_ndp", 6675 .data = &ipv6_devconf.proxy_ndp, 6676 .maxlen = sizeof(int), 6677 .mode = 0644, 6678 .proc_handler = addrconf_sysctl_proxy_ndp, 6679 }, 6680 { 6681 .procname = "accept_source_route", 6682 .data = &ipv6_devconf.accept_source_route, 6683 .maxlen = sizeof(int), 6684 .mode = 0644, 6685 .proc_handler = proc_dointvec, 6686 }, 6687 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 6688 { 6689 .procname = "optimistic_dad", 6690 .data = &ipv6_devconf.optimistic_dad, 6691 .maxlen = sizeof(int), 6692 .mode = 0644, 6693 .proc_handler = proc_dointvec, 6694 }, 6695 { 6696 .procname = "use_optimistic", 6697 .data = &ipv6_devconf.use_optimistic, 6698 .maxlen = sizeof(int), 6699 .mode = 0644, 6700 .proc_handler = proc_dointvec, 6701 }, 6702 #endif 6703 #ifdef CONFIG_IPV6_MROUTE 6704 { 6705 .procname = "mc_forwarding", 6706 .data = &ipv6_devconf.mc_forwarding, 6707 .maxlen = sizeof(int), 6708 .mode = 0444, 6709 .proc_handler = proc_dointvec, 6710 }, 6711 #endif 6712 { 6713 .procname = "disable_ipv6", 6714 .data = &ipv6_devconf.disable_ipv6, 6715 .maxlen = sizeof(int), 6716 .mode = 0644, 6717 .proc_handler = addrconf_sysctl_disable, 6718 }, 6719 { 6720 .procname = "accept_dad", 6721 .data = &ipv6_devconf.accept_dad, 6722 .maxlen = sizeof(int), 6723 .mode = 0644, 6724 .proc_handler = proc_dointvec, 6725 }, 6726 { 6727 .procname = "force_tllao", 6728 .data = &ipv6_devconf.force_tllao, 6729 .maxlen = sizeof(int), 6730 .mode = 0644, 6731 .proc_handler = proc_dointvec 6732 }, 6733 { 6734 .procname = "ndisc_notify", 6735 .data = &ipv6_devconf.ndisc_notify, 6736 .maxlen = sizeof(int), 6737 .mode = 0644, 6738 .proc_handler = proc_dointvec 6739 }, 6740 { 6741 .procname = "suppress_frag_ndisc", 6742 .data = &ipv6_devconf.suppress_frag_ndisc, 6743 .maxlen = sizeof(int), 6744 .mode = 0644, 6745 .proc_handler = proc_dointvec 6746 }, 6747 { 6748 .procname = "accept_ra_from_local", 6749 .data = &ipv6_devconf.accept_ra_from_local, 6750 .maxlen = sizeof(int), 6751 .mode = 0644, 6752 .proc_handler = proc_dointvec, 6753 }, 6754 { 6755 .procname = "accept_ra_mtu", 6756 .data = &ipv6_devconf.accept_ra_mtu, 6757 .maxlen = sizeof(int), 6758 .mode = 0644, 6759 .proc_handler = proc_dointvec, 6760 }, 6761 { 6762 .procname = "stable_secret", 6763 .data = &ipv6_devconf.stable_secret, 6764 .maxlen = IPV6_MAX_STRLEN, 6765 .mode = 0600, 6766 .proc_handler = addrconf_sysctl_stable_secret, 6767 }, 6768 { 6769 .procname = "use_oif_addrs_only", 6770 .data = &ipv6_devconf.use_oif_addrs_only, 6771 .maxlen = sizeof(int), 6772 .mode = 0644, 6773 .proc_handler = proc_dointvec, 6774 }, 6775 { 6776 .procname = "ignore_routes_with_linkdown", 6777 .data = &ipv6_devconf.ignore_routes_with_linkdown, 6778 .maxlen = sizeof(int), 6779 .mode = 0644, 6780 .proc_handler = addrconf_sysctl_ignore_routes_with_linkdown, 6781 }, 6782 { 6783 .procname = "drop_unicast_in_l2_multicast", 6784 .data = &ipv6_devconf.drop_unicast_in_l2_multicast, 6785 .maxlen = sizeof(int), 6786 .mode = 0644, 6787 .proc_handler = proc_dointvec, 6788 }, 6789 { 6790 .procname = "drop_unsolicited_na", 6791 .data = &ipv6_devconf.drop_unsolicited_na, 6792 .maxlen = sizeof(int), 6793 .mode = 0644, 6794 .proc_handler = proc_dointvec, 6795 }, 6796 { 6797 .procname = "keep_addr_on_down", 6798 .data = &ipv6_devconf.keep_addr_on_down, 6799 .maxlen = sizeof(int), 6800 .mode = 0644, 6801 .proc_handler = proc_dointvec, 6802 6803 }, 6804 { 6805 .procname = "seg6_enabled", 6806 .data = &ipv6_devconf.seg6_enabled, 6807 .maxlen = sizeof(int), 6808 .mode = 0644, 6809 .proc_handler = proc_dointvec, 6810 }, 6811 #ifdef CONFIG_IPV6_SEG6_HMAC 6812 { 6813 .procname = "seg6_require_hmac", 6814 .data = &ipv6_devconf.seg6_require_hmac, 6815 .maxlen = sizeof(int), 6816 .mode = 0644, 6817 .proc_handler = proc_dointvec, 6818 }, 6819 #endif 6820 { 6821 .procname = "enhanced_dad", 6822 .data = &ipv6_devconf.enhanced_dad, 6823 .maxlen = sizeof(int), 6824 .mode = 0644, 6825 .proc_handler = proc_dointvec, 6826 }, 6827 { 6828 .procname = "addr_gen_mode", 6829 .data = &ipv6_devconf.addr_gen_mode, 6830 .maxlen = sizeof(int), 6831 .mode = 0644, 6832 .proc_handler = addrconf_sysctl_addr_gen_mode, 6833 }, 6834 { 6835 .procname = "disable_policy", 6836 .data = &ipv6_devconf.disable_policy, 6837 .maxlen = sizeof(int), 6838 .mode = 0644, 6839 .proc_handler = addrconf_sysctl_disable_policy, 6840 }, 6841 { 6842 .procname = "ndisc_tclass", 6843 .data = &ipv6_devconf.ndisc_tclass, 6844 .maxlen = sizeof(int), 6845 .mode = 0644, 6846 .proc_handler = proc_dointvec_minmax, 6847 .extra1 = (void *)SYSCTL_ZERO, 6848 .extra2 = (void *)&two_five_five, 6849 }, 6850 { 6851 /* sentinel */ 6852 } 6853 }; 6854 6855 static int __addrconf_sysctl_register(struct net *net, char *dev_name, 6856 struct inet6_dev *idev, struct ipv6_devconf *p) 6857 { 6858 int i, ifindex; 6859 struct ctl_table *table; 6860 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ]; 6861 6862 table = kmemdup(addrconf_sysctl, sizeof(addrconf_sysctl), GFP_KERNEL); 6863 if (!table) 6864 goto out; 6865 6866 for (i = 0; table[i].data; i++) { 6867 table[i].data += (char *)p - (char *)&ipv6_devconf; 6868 /* If one of these is already set, then it is not safe to 6869 * overwrite either of them: this makes proc_dointvec_minmax 6870 * usable. 6871 */ 6872 if (!table[i].extra1 && !table[i].extra2) { 6873 table[i].extra1 = idev; /* embedded; no ref */ 6874 table[i].extra2 = net; 6875 } 6876 } 6877 6878 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name); 6879 6880 p->sysctl_header = register_net_sysctl(net, path, table); 6881 if (!p->sysctl_header) 6882 goto free; 6883 6884 if (!strcmp(dev_name, "all")) 6885 ifindex = NETCONFA_IFINDEX_ALL; 6886 else if (!strcmp(dev_name, "default")) 6887 ifindex = NETCONFA_IFINDEX_DEFAULT; 6888 else 6889 ifindex = idev->dev->ifindex; 6890 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, NETCONFA_ALL, 6891 ifindex, p); 6892 return 0; 6893 6894 free: 6895 kfree(table); 6896 out: 6897 return -ENOBUFS; 6898 } 6899 6900 static void __addrconf_sysctl_unregister(struct net *net, 6901 struct ipv6_devconf *p, int ifindex) 6902 { 6903 struct ctl_table *table; 6904 6905 if (!p->sysctl_header) 6906 return; 6907 6908 table = p->sysctl_header->ctl_table_arg; 6909 unregister_net_sysctl_table(p->sysctl_header); 6910 p->sysctl_header = NULL; 6911 kfree(table); 6912 6913 inet6_netconf_notify_devconf(net, RTM_DELNETCONF, 0, ifindex, NULL); 6914 } 6915 6916 static int addrconf_sysctl_register(struct inet6_dev *idev) 6917 { 6918 int err; 6919 6920 if (!sysctl_dev_name_is_allowed(idev->dev->name)) 6921 return -EINVAL; 6922 6923 err = neigh_sysctl_register(idev->dev, idev->nd_parms, 6924 &ndisc_ifinfo_sysctl_change); 6925 if (err) 6926 return err; 6927 err = __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name, 6928 idev, &idev->cnf); 6929 if (err) 6930 neigh_sysctl_unregister(idev->nd_parms); 6931 6932 return err; 6933 } 6934 6935 static void addrconf_sysctl_unregister(struct inet6_dev *idev) 6936 { 6937 __addrconf_sysctl_unregister(dev_net(idev->dev), &idev->cnf, 6938 idev->dev->ifindex); 6939 neigh_sysctl_unregister(idev->nd_parms); 6940 } 6941 6942 6943 #endif 6944 6945 static int __net_init addrconf_init_net(struct net *net) 6946 { 6947 int err = -ENOMEM; 6948 struct ipv6_devconf *all, *dflt; 6949 6950 all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL); 6951 if (!all) 6952 goto err_alloc_all; 6953 6954 dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL); 6955 if (!dflt) 6956 goto err_alloc_dflt; 6957 6958 if (IS_ENABLED(CONFIG_SYSCTL) && 6959 sysctl_devconf_inherit_init_net == 1 && !net_eq(net, &init_net)) { 6960 memcpy(all, init_net.ipv6.devconf_all, sizeof(ipv6_devconf)); 6961 memcpy(dflt, init_net.ipv6.devconf_dflt, sizeof(ipv6_devconf_dflt)); 6962 } 6963 6964 /* these will be inherited by all namespaces */ 6965 dflt->autoconf = ipv6_defaults.autoconf; 6966 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6; 6967 6968 dflt->stable_secret.initialized = false; 6969 all->stable_secret.initialized = false; 6970 6971 net->ipv6.devconf_all = all; 6972 net->ipv6.devconf_dflt = dflt; 6973 6974 #ifdef CONFIG_SYSCTL 6975 err = __addrconf_sysctl_register(net, "all", NULL, all); 6976 if (err < 0) 6977 goto err_reg_all; 6978 6979 err = __addrconf_sysctl_register(net, "default", NULL, dflt); 6980 if (err < 0) 6981 goto err_reg_dflt; 6982 #endif 6983 return 0; 6984 6985 #ifdef CONFIG_SYSCTL 6986 err_reg_dflt: 6987 __addrconf_sysctl_unregister(net, all, NETCONFA_IFINDEX_ALL); 6988 err_reg_all: 6989 kfree(dflt); 6990 #endif 6991 err_alloc_dflt: 6992 kfree(all); 6993 err_alloc_all: 6994 return err; 6995 } 6996 6997 static void __net_exit addrconf_exit_net(struct net *net) 6998 { 6999 #ifdef CONFIG_SYSCTL 7000 __addrconf_sysctl_unregister(net, net->ipv6.devconf_dflt, 7001 NETCONFA_IFINDEX_DEFAULT); 7002 __addrconf_sysctl_unregister(net, net->ipv6.devconf_all, 7003 NETCONFA_IFINDEX_ALL); 7004 #endif 7005 kfree(net->ipv6.devconf_dflt); 7006 kfree(net->ipv6.devconf_all); 7007 } 7008 7009 static struct pernet_operations addrconf_ops = { 7010 .init = addrconf_init_net, 7011 .exit = addrconf_exit_net, 7012 }; 7013 7014 static struct rtnl_af_ops inet6_ops __read_mostly = { 7015 .family = AF_INET6, 7016 .fill_link_af = inet6_fill_link_af, 7017 .get_link_af_size = inet6_get_link_af_size, 7018 .validate_link_af = inet6_validate_link_af, 7019 .set_link_af = inet6_set_link_af, 7020 }; 7021 7022 /* 7023 * Init / cleanup code 7024 */ 7025 7026 int __init addrconf_init(void) 7027 { 7028 struct inet6_dev *idev; 7029 int i, err; 7030 7031 err = ipv6_addr_label_init(); 7032 if (err < 0) { 7033 pr_crit("%s: cannot initialize default policy table: %d\n", 7034 __func__, err); 7035 goto out; 7036 } 7037 7038 err = register_pernet_subsys(&addrconf_ops); 7039 if (err < 0) 7040 goto out_addrlabel; 7041 7042 addrconf_wq = create_workqueue("ipv6_addrconf"); 7043 if (!addrconf_wq) { 7044 err = -ENOMEM; 7045 goto out_nowq; 7046 } 7047 7048 /* The addrconf netdev notifier requires that loopback_dev 7049 * has it's ipv6 private information allocated and setup 7050 * before it can bring up and give link-local addresses 7051 * to other devices which are up. 7052 * 7053 * Unfortunately, loopback_dev is not necessarily the first 7054 * entry in the global dev_base list of net devices. In fact, 7055 * it is likely to be the very last entry on that list. 7056 * So this causes the notifier registry below to try and 7057 * give link-local addresses to all devices besides loopback_dev 7058 * first, then loopback_dev, which cases all the non-loopback_dev 7059 * devices to fail to get a link-local address. 7060 * 7061 * So, as a temporary fix, allocate the ipv6 structure for 7062 * loopback_dev first by hand. 7063 * Longer term, all of the dependencies ipv6 has upon the loopback 7064 * device and it being up should be removed. 7065 */ 7066 rtnl_lock(); 7067 idev = ipv6_add_dev(init_net.loopback_dev); 7068 rtnl_unlock(); 7069 if (IS_ERR(idev)) { 7070 err = PTR_ERR(idev); 7071 goto errlo; 7072 } 7073 7074 ip6_route_init_special_entries(); 7075 7076 for (i = 0; i < IN6_ADDR_HSIZE; i++) 7077 INIT_HLIST_HEAD(&inet6_addr_lst[i]); 7078 7079 register_netdevice_notifier(&ipv6_dev_notf); 7080 7081 addrconf_verify(); 7082 7083 rtnl_af_register(&inet6_ops); 7084 7085 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETLINK, 7086 NULL, inet6_dump_ifinfo, 0); 7087 if (err < 0) 7088 goto errout; 7089 7090 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_NEWADDR, 7091 inet6_rtm_newaddr, NULL, 0); 7092 if (err < 0) 7093 goto errout; 7094 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_DELADDR, 7095 inet6_rtm_deladdr, NULL, 0); 7096 if (err < 0) 7097 goto errout; 7098 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETADDR, 7099 inet6_rtm_getaddr, inet6_dump_ifaddr, 7100 RTNL_FLAG_DOIT_UNLOCKED); 7101 if (err < 0) 7102 goto errout; 7103 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETMULTICAST, 7104 NULL, inet6_dump_ifmcaddr, 0); 7105 if (err < 0) 7106 goto errout; 7107 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETANYCAST, 7108 NULL, inet6_dump_ifacaddr, 0); 7109 if (err < 0) 7110 goto errout; 7111 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETNETCONF, 7112 inet6_netconf_get_devconf, 7113 inet6_netconf_dump_devconf, 7114 RTNL_FLAG_DOIT_UNLOCKED); 7115 if (err < 0) 7116 goto errout; 7117 err = ipv6_addr_label_rtnl_register(); 7118 if (err < 0) 7119 goto errout; 7120 7121 return 0; 7122 errout: 7123 rtnl_unregister_all(PF_INET6); 7124 rtnl_af_unregister(&inet6_ops); 7125 unregister_netdevice_notifier(&ipv6_dev_notf); 7126 errlo: 7127 destroy_workqueue(addrconf_wq); 7128 out_nowq: 7129 unregister_pernet_subsys(&addrconf_ops); 7130 out_addrlabel: 7131 ipv6_addr_label_cleanup(); 7132 out: 7133 return err; 7134 } 7135 7136 void addrconf_cleanup(void) 7137 { 7138 struct net_device *dev; 7139 int i; 7140 7141 unregister_netdevice_notifier(&ipv6_dev_notf); 7142 unregister_pernet_subsys(&addrconf_ops); 7143 ipv6_addr_label_cleanup(); 7144 7145 rtnl_af_unregister(&inet6_ops); 7146 7147 rtnl_lock(); 7148 7149 /* clean dev list */ 7150 for_each_netdev(&init_net, dev) { 7151 if (__in6_dev_get(dev) == NULL) 7152 continue; 7153 addrconf_ifdown(dev, 1); 7154 } 7155 addrconf_ifdown(init_net.loopback_dev, 2); 7156 7157 /* 7158 * Check hash table. 7159 */ 7160 spin_lock_bh(&addrconf_hash_lock); 7161 for (i = 0; i < IN6_ADDR_HSIZE; i++) 7162 WARN_ON(!hlist_empty(&inet6_addr_lst[i])); 7163 spin_unlock_bh(&addrconf_hash_lock); 7164 cancel_delayed_work(&addr_chk_work); 7165 rtnl_unlock(); 7166 7167 destroy_workqueue(addrconf_wq); 7168 } 7169