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_gen_rnd_iid(struct in6_addr *addr); 139 140 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev); 141 static int ipv6_count_addresses(const struct inet6_dev *idev); 142 static int ipv6_generate_stable_address(struct in6_addr *addr, 143 u8 dad_count, 144 const struct inet6_dev *idev); 145 146 #define IN6_ADDR_HSIZE_SHIFT 8 147 #define IN6_ADDR_HSIZE (1 << IN6_ADDR_HSIZE_SHIFT) 148 /* 149 * Configured unicast address hash table 150 */ 151 static struct hlist_head inet6_addr_lst[IN6_ADDR_HSIZE]; 152 static DEFINE_SPINLOCK(addrconf_hash_lock); 153 154 static void addrconf_verify(void); 155 static void addrconf_verify_rtnl(void); 156 static void addrconf_verify_work(struct work_struct *); 157 158 static struct workqueue_struct *addrconf_wq; 159 static DECLARE_DELAYED_WORK(addr_chk_work, addrconf_verify_work); 160 161 static void addrconf_join_anycast(struct inet6_ifaddr *ifp); 162 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp); 163 164 static void addrconf_type_change(struct net_device *dev, 165 unsigned long event); 166 static int addrconf_ifdown(struct net_device *dev, bool unregister); 167 168 static struct fib6_info *addrconf_get_prefix_route(const struct in6_addr *pfx, 169 int plen, 170 const struct net_device *dev, 171 u32 flags, u32 noflags, 172 bool no_gw); 173 174 static void addrconf_dad_start(struct inet6_ifaddr *ifp); 175 static void addrconf_dad_work(struct work_struct *w); 176 static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id, 177 bool send_na); 178 static void addrconf_dad_run(struct inet6_dev *idev, bool restart); 179 static void addrconf_rs_timer(struct timer_list *t); 180 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa); 181 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa); 182 183 static void inet6_prefix_notify(int event, struct inet6_dev *idev, 184 struct prefix_info *pinfo); 185 186 static struct ipv6_devconf ipv6_devconf __read_mostly = { 187 .forwarding = 0, 188 .hop_limit = IPV6_DEFAULT_HOPLIMIT, 189 .mtu6 = IPV6_MIN_MTU, 190 .accept_ra = 1, 191 .accept_redirects = 1, 192 .autoconf = 1, 193 .force_mld_version = 0, 194 .mldv1_unsolicited_report_interval = 10 * HZ, 195 .mldv2_unsolicited_report_interval = HZ, 196 .dad_transmits = 1, 197 .rtr_solicits = MAX_RTR_SOLICITATIONS, 198 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL, 199 .rtr_solicit_max_interval = RTR_SOLICITATION_MAX_INTERVAL, 200 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY, 201 .use_tempaddr = 0, 202 .temp_valid_lft = TEMP_VALID_LIFETIME, 203 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME, 204 .regen_max_retry = REGEN_MAX_RETRY, 205 .max_desync_factor = MAX_DESYNC_FACTOR, 206 .max_addresses = IPV6_MAX_ADDRESSES, 207 .accept_ra_defrtr = 1, 208 .ra_defrtr_metric = IP6_RT_PRIO_USER, 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 .rpl_seg_enabled = 0, 240 }; 241 242 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = { 243 .forwarding = 0, 244 .hop_limit = IPV6_DEFAULT_HOPLIMIT, 245 .mtu6 = IPV6_MIN_MTU, 246 .accept_ra = 1, 247 .accept_redirects = 1, 248 .autoconf = 1, 249 .force_mld_version = 0, 250 .mldv1_unsolicited_report_interval = 10 * HZ, 251 .mldv2_unsolicited_report_interval = HZ, 252 .dad_transmits = 1, 253 .rtr_solicits = MAX_RTR_SOLICITATIONS, 254 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL, 255 .rtr_solicit_max_interval = RTR_SOLICITATION_MAX_INTERVAL, 256 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY, 257 .use_tempaddr = 0, 258 .temp_valid_lft = TEMP_VALID_LIFETIME, 259 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME, 260 .regen_max_retry = REGEN_MAX_RETRY, 261 .max_desync_factor = MAX_DESYNC_FACTOR, 262 .max_addresses = IPV6_MAX_ADDRESSES, 263 .accept_ra_defrtr = 1, 264 .ra_defrtr_metric = IP6_RT_PRIO_USER, 265 .accept_ra_from_local = 0, 266 .accept_ra_min_hop_limit= 1, 267 .accept_ra_pinfo = 1, 268 #ifdef CONFIG_IPV6_ROUTER_PREF 269 .accept_ra_rtr_pref = 1, 270 .rtr_probe_interval = 60 * HZ, 271 #ifdef CONFIG_IPV6_ROUTE_INFO 272 .accept_ra_rt_info_min_plen = 0, 273 .accept_ra_rt_info_max_plen = 0, 274 #endif 275 #endif 276 .proxy_ndp = 0, 277 .accept_source_route = 0, /* we do not accept RH0 by default. */ 278 .disable_ipv6 = 0, 279 .accept_dad = 1, 280 .suppress_frag_ndisc = 1, 281 .accept_ra_mtu = 1, 282 .stable_secret = { 283 .initialized = false, 284 }, 285 .use_oif_addrs_only = 0, 286 .ignore_routes_with_linkdown = 0, 287 .keep_addr_on_down = 0, 288 .seg6_enabled = 0, 289 #ifdef CONFIG_IPV6_SEG6_HMAC 290 .seg6_require_hmac = 0, 291 #endif 292 .enhanced_dad = 1, 293 .addr_gen_mode = IN6_ADDR_GEN_MODE_EUI64, 294 .disable_policy = 0, 295 .rpl_seg_enabled = 0, 296 }; 297 298 /* Check if link is ready: is it up and is a valid qdisc available */ 299 static inline bool addrconf_link_ready(const struct net_device *dev) 300 { 301 return netif_oper_up(dev) && !qdisc_tx_is_noop(dev); 302 } 303 304 static void addrconf_del_rs_timer(struct inet6_dev *idev) 305 { 306 if (del_timer(&idev->rs_timer)) 307 __in6_dev_put(idev); 308 } 309 310 static void addrconf_del_dad_work(struct inet6_ifaddr *ifp) 311 { 312 if (cancel_delayed_work(&ifp->dad_work)) 313 __in6_ifa_put(ifp); 314 } 315 316 static void addrconf_mod_rs_timer(struct inet6_dev *idev, 317 unsigned long when) 318 { 319 if (!timer_pending(&idev->rs_timer)) 320 in6_dev_hold(idev); 321 mod_timer(&idev->rs_timer, jiffies + when); 322 } 323 324 static void addrconf_mod_dad_work(struct inet6_ifaddr *ifp, 325 unsigned long delay) 326 { 327 in6_ifa_hold(ifp); 328 if (mod_delayed_work(addrconf_wq, &ifp->dad_work, delay)) 329 in6_ifa_put(ifp); 330 } 331 332 static int snmp6_alloc_dev(struct inet6_dev *idev) 333 { 334 int i; 335 336 idev->stats.ipv6 = alloc_percpu(struct ipstats_mib); 337 if (!idev->stats.ipv6) 338 goto err_ip; 339 340 for_each_possible_cpu(i) { 341 struct ipstats_mib *addrconf_stats; 342 addrconf_stats = per_cpu_ptr(idev->stats.ipv6, i); 343 u64_stats_init(&addrconf_stats->syncp); 344 } 345 346 347 idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device), 348 GFP_KERNEL); 349 if (!idev->stats.icmpv6dev) 350 goto err_icmp; 351 idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device), 352 GFP_KERNEL); 353 if (!idev->stats.icmpv6msgdev) 354 goto err_icmpmsg; 355 356 return 0; 357 358 err_icmpmsg: 359 kfree(idev->stats.icmpv6dev); 360 err_icmp: 361 free_percpu(idev->stats.ipv6); 362 err_ip: 363 return -ENOMEM; 364 } 365 366 static struct inet6_dev *ipv6_add_dev(struct net_device *dev) 367 { 368 struct inet6_dev *ndev; 369 int err = -ENOMEM; 370 371 ASSERT_RTNL(); 372 373 if (dev->mtu < IPV6_MIN_MTU) 374 return ERR_PTR(-EINVAL); 375 376 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL); 377 if (!ndev) 378 return ERR_PTR(err); 379 380 rwlock_init(&ndev->lock); 381 ndev->dev = dev; 382 INIT_LIST_HEAD(&ndev->addr_list); 383 timer_setup(&ndev->rs_timer, addrconf_rs_timer, 0); 384 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf)); 385 386 if (ndev->cnf.stable_secret.initialized) 387 ndev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY; 388 389 ndev->cnf.mtu6 = dev->mtu; 390 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl); 391 if (!ndev->nd_parms) { 392 kfree(ndev); 393 return ERR_PTR(err); 394 } 395 if (ndev->cnf.forwarding) 396 dev_disable_lro(dev); 397 /* We refer to the device */ 398 dev_hold(dev); 399 400 if (snmp6_alloc_dev(ndev) < 0) { 401 netdev_dbg(dev, "%s: cannot allocate memory for statistics\n", 402 __func__); 403 neigh_parms_release(&nd_tbl, ndev->nd_parms); 404 dev_put(dev); 405 kfree(ndev); 406 return ERR_PTR(err); 407 } 408 409 if (snmp6_register_dev(ndev) < 0) { 410 netdev_dbg(dev, "%s: cannot create /proc/net/dev_snmp6/%s\n", 411 __func__, dev->name); 412 goto err_release; 413 } 414 415 /* One reference from device. */ 416 refcount_set(&ndev->refcnt, 1); 417 418 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK)) 419 ndev->cnf.accept_dad = -1; 420 421 #if IS_ENABLED(CONFIG_IPV6_SIT) 422 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) { 423 pr_info("%s: Disabled Multicast RS\n", dev->name); 424 ndev->cnf.rtr_solicits = 0; 425 } 426 #endif 427 428 INIT_LIST_HEAD(&ndev->tempaddr_list); 429 ndev->desync_factor = U32_MAX; 430 if ((dev->flags&IFF_LOOPBACK) || 431 dev->type == ARPHRD_TUNNEL || 432 dev->type == ARPHRD_TUNNEL6 || 433 dev->type == ARPHRD_SIT || 434 dev->type == ARPHRD_NONE) { 435 ndev->cnf.use_tempaddr = -1; 436 } 437 438 ndev->token = in6addr_any; 439 440 if (netif_running(dev) && addrconf_link_ready(dev)) 441 ndev->if_flags |= IF_READY; 442 443 ipv6_mc_init_dev(ndev); 444 ndev->tstamp = jiffies; 445 err = addrconf_sysctl_register(ndev); 446 if (err) { 447 ipv6_mc_destroy_dev(ndev); 448 snmp6_unregister_dev(ndev); 449 goto err_release; 450 } 451 /* protected by rtnl_lock */ 452 rcu_assign_pointer(dev->ip6_ptr, ndev); 453 454 /* Join interface-local all-node multicast group */ 455 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allnodes); 456 457 /* Join all-node multicast group */ 458 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes); 459 460 /* Join all-router multicast group if forwarding is set */ 461 if (ndev->cnf.forwarding && (dev->flags & IFF_MULTICAST)) 462 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters); 463 464 return ndev; 465 466 err_release: 467 neigh_parms_release(&nd_tbl, ndev->nd_parms); 468 ndev->dead = 1; 469 in6_dev_finish_destroy(ndev); 470 return ERR_PTR(err); 471 } 472 473 static struct inet6_dev *ipv6_find_idev(struct net_device *dev) 474 { 475 struct inet6_dev *idev; 476 477 ASSERT_RTNL(); 478 479 idev = __in6_dev_get(dev); 480 if (!idev) { 481 idev = ipv6_add_dev(dev); 482 if (IS_ERR(idev)) 483 return idev; 484 } 485 486 if (dev->flags&IFF_UP) 487 ipv6_mc_up(idev); 488 return idev; 489 } 490 491 static int inet6_netconf_msgsize_devconf(int type) 492 { 493 int size = NLMSG_ALIGN(sizeof(struct netconfmsg)) 494 + nla_total_size(4); /* NETCONFA_IFINDEX */ 495 bool all = false; 496 497 if (type == NETCONFA_ALL) 498 all = true; 499 500 if (all || type == NETCONFA_FORWARDING) 501 size += nla_total_size(4); 502 #ifdef CONFIG_IPV6_MROUTE 503 if (all || type == NETCONFA_MC_FORWARDING) 504 size += nla_total_size(4); 505 #endif 506 if (all || type == NETCONFA_PROXY_NEIGH) 507 size += nla_total_size(4); 508 509 if (all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN) 510 size += nla_total_size(4); 511 512 return size; 513 } 514 515 static int inet6_netconf_fill_devconf(struct sk_buff *skb, int ifindex, 516 struct ipv6_devconf *devconf, u32 portid, 517 u32 seq, int event, unsigned int flags, 518 int type) 519 { 520 struct nlmsghdr *nlh; 521 struct netconfmsg *ncm; 522 bool all = false; 523 524 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg), 525 flags); 526 if (!nlh) 527 return -EMSGSIZE; 528 529 if (type == NETCONFA_ALL) 530 all = true; 531 532 ncm = nlmsg_data(nlh); 533 ncm->ncm_family = AF_INET6; 534 535 if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0) 536 goto nla_put_failure; 537 538 if (!devconf) 539 goto out; 540 541 if ((all || type == NETCONFA_FORWARDING) && 542 nla_put_s32(skb, NETCONFA_FORWARDING, devconf->forwarding) < 0) 543 goto nla_put_failure; 544 #ifdef CONFIG_IPV6_MROUTE 545 if ((all || type == NETCONFA_MC_FORWARDING) && 546 nla_put_s32(skb, NETCONFA_MC_FORWARDING, 547 devconf->mc_forwarding) < 0) 548 goto nla_put_failure; 549 #endif 550 if ((all || type == NETCONFA_PROXY_NEIGH) && 551 nla_put_s32(skb, NETCONFA_PROXY_NEIGH, devconf->proxy_ndp) < 0) 552 goto nla_put_failure; 553 554 if ((all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN) && 555 nla_put_s32(skb, NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN, 556 devconf->ignore_routes_with_linkdown) < 0) 557 goto nla_put_failure; 558 559 out: 560 nlmsg_end(skb, nlh); 561 return 0; 562 563 nla_put_failure: 564 nlmsg_cancel(skb, nlh); 565 return -EMSGSIZE; 566 } 567 568 void inet6_netconf_notify_devconf(struct net *net, int event, int type, 569 int ifindex, struct ipv6_devconf *devconf) 570 { 571 struct sk_buff *skb; 572 int err = -ENOBUFS; 573 574 skb = nlmsg_new(inet6_netconf_msgsize_devconf(type), GFP_KERNEL); 575 if (!skb) 576 goto errout; 577 578 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 0, 0, 579 event, 0, type); 580 if (err < 0) { 581 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */ 582 WARN_ON(err == -EMSGSIZE); 583 kfree_skb(skb); 584 goto errout; 585 } 586 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_NETCONF, NULL, GFP_KERNEL); 587 return; 588 errout: 589 rtnl_set_sk_err(net, RTNLGRP_IPV6_NETCONF, err); 590 } 591 592 static const struct nla_policy devconf_ipv6_policy[NETCONFA_MAX+1] = { 593 [NETCONFA_IFINDEX] = { .len = sizeof(int) }, 594 [NETCONFA_FORWARDING] = { .len = sizeof(int) }, 595 [NETCONFA_PROXY_NEIGH] = { .len = sizeof(int) }, 596 [NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN] = { .len = sizeof(int) }, 597 }; 598 599 static int inet6_netconf_valid_get_req(struct sk_buff *skb, 600 const struct nlmsghdr *nlh, 601 struct nlattr **tb, 602 struct netlink_ext_ack *extack) 603 { 604 int i, err; 605 606 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(struct netconfmsg))) { 607 NL_SET_ERR_MSG_MOD(extack, "Invalid header for netconf get request"); 608 return -EINVAL; 609 } 610 611 if (!netlink_strict_get_check(skb)) 612 return nlmsg_parse_deprecated(nlh, sizeof(struct netconfmsg), 613 tb, NETCONFA_MAX, 614 devconf_ipv6_policy, extack); 615 616 err = nlmsg_parse_deprecated_strict(nlh, sizeof(struct netconfmsg), 617 tb, NETCONFA_MAX, 618 devconf_ipv6_policy, extack); 619 if (err) 620 return err; 621 622 for (i = 0; i <= NETCONFA_MAX; i++) { 623 if (!tb[i]) 624 continue; 625 626 switch (i) { 627 case NETCONFA_IFINDEX: 628 break; 629 default: 630 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in netconf get request"); 631 return -EINVAL; 632 } 633 } 634 635 return 0; 636 } 637 638 static int inet6_netconf_get_devconf(struct sk_buff *in_skb, 639 struct nlmsghdr *nlh, 640 struct netlink_ext_ack *extack) 641 { 642 struct net *net = sock_net(in_skb->sk); 643 struct nlattr *tb[NETCONFA_MAX+1]; 644 struct inet6_dev *in6_dev = NULL; 645 struct net_device *dev = NULL; 646 struct sk_buff *skb; 647 struct ipv6_devconf *devconf; 648 int ifindex; 649 int err; 650 651 err = inet6_netconf_valid_get_req(in_skb, nlh, tb, extack); 652 if (err < 0) 653 return err; 654 655 if (!tb[NETCONFA_IFINDEX]) 656 return -EINVAL; 657 658 err = -EINVAL; 659 ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]); 660 switch (ifindex) { 661 case NETCONFA_IFINDEX_ALL: 662 devconf = net->ipv6.devconf_all; 663 break; 664 case NETCONFA_IFINDEX_DEFAULT: 665 devconf = net->ipv6.devconf_dflt; 666 break; 667 default: 668 dev = dev_get_by_index(net, ifindex); 669 if (!dev) 670 return -EINVAL; 671 in6_dev = in6_dev_get(dev); 672 if (!in6_dev) 673 goto errout; 674 devconf = &in6_dev->cnf; 675 break; 676 } 677 678 err = -ENOBUFS; 679 skb = nlmsg_new(inet6_netconf_msgsize_devconf(NETCONFA_ALL), GFP_KERNEL); 680 if (!skb) 681 goto errout; 682 683 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 684 NETLINK_CB(in_skb).portid, 685 nlh->nlmsg_seq, RTM_NEWNETCONF, 0, 686 NETCONFA_ALL); 687 if (err < 0) { 688 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */ 689 WARN_ON(err == -EMSGSIZE); 690 kfree_skb(skb); 691 goto errout; 692 } 693 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid); 694 errout: 695 if (in6_dev) 696 in6_dev_put(in6_dev); 697 if (dev) 698 dev_put(dev); 699 return err; 700 } 701 702 static int inet6_netconf_dump_devconf(struct sk_buff *skb, 703 struct netlink_callback *cb) 704 { 705 const struct nlmsghdr *nlh = cb->nlh; 706 struct net *net = sock_net(skb->sk); 707 int h, s_h; 708 int idx, s_idx; 709 struct net_device *dev; 710 struct inet6_dev *idev; 711 struct hlist_head *head; 712 713 if (cb->strict_check) { 714 struct netlink_ext_ack *extack = cb->extack; 715 struct netconfmsg *ncm; 716 717 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ncm))) { 718 NL_SET_ERR_MSG_MOD(extack, "Invalid header for netconf dump request"); 719 return -EINVAL; 720 } 721 722 if (nlmsg_attrlen(nlh, sizeof(*ncm))) { 723 NL_SET_ERR_MSG_MOD(extack, "Invalid data after header in netconf dump request"); 724 return -EINVAL; 725 } 726 } 727 728 s_h = cb->args[0]; 729 s_idx = idx = cb->args[1]; 730 731 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 732 idx = 0; 733 head = &net->dev_index_head[h]; 734 rcu_read_lock(); 735 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ 736 net->dev_base_seq; 737 hlist_for_each_entry_rcu(dev, head, index_hlist) { 738 if (idx < s_idx) 739 goto cont; 740 idev = __in6_dev_get(dev); 741 if (!idev) 742 goto cont; 743 744 if (inet6_netconf_fill_devconf(skb, dev->ifindex, 745 &idev->cnf, 746 NETLINK_CB(cb->skb).portid, 747 nlh->nlmsg_seq, 748 RTM_NEWNETCONF, 749 NLM_F_MULTI, 750 NETCONFA_ALL) < 0) { 751 rcu_read_unlock(); 752 goto done; 753 } 754 nl_dump_check_consistent(cb, nlmsg_hdr(skb)); 755 cont: 756 idx++; 757 } 758 rcu_read_unlock(); 759 } 760 if (h == NETDEV_HASHENTRIES) { 761 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL, 762 net->ipv6.devconf_all, 763 NETLINK_CB(cb->skb).portid, 764 nlh->nlmsg_seq, 765 RTM_NEWNETCONF, NLM_F_MULTI, 766 NETCONFA_ALL) < 0) 767 goto done; 768 else 769 h++; 770 } 771 if (h == NETDEV_HASHENTRIES + 1) { 772 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT, 773 net->ipv6.devconf_dflt, 774 NETLINK_CB(cb->skb).portid, 775 nlh->nlmsg_seq, 776 RTM_NEWNETCONF, NLM_F_MULTI, 777 NETCONFA_ALL) < 0) 778 goto done; 779 else 780 h++; 781 } 782 done: 783 cb->args[0] = h; 784 cb->args[1] = idx; 785 786 return skb->len; 787 } 788 789 #ifdef CONFIG_SYSCTL 790 static void dev_forward_change(struct inet6_dev *idev) 791 { 792 struct net_device *dev; 793 struct inet6_ifaddr *ifa; 794 795 if (!idev) 796 return; 797 dev = idev->dev; 798 if (idev->cnf.forwarding) 799 dev_disable_lro(dev); 800 if (dev->flags & IFF_MULTICAST) { 801 if (idev->cnf.forwarding) { 802 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters); 803 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allrouters); 804 ipv6_dev_mc_inc(dev, &in6addr_sitelocal_allrouters); 805 } else { 806 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters); 807 ipv6_dev_mc_dec(dev, &in6addr_interfacelocal_allrouters); 808 ipv6_dev_mc_dec(dev, &in6addr_sitelocal_allrouters); 809 } 810 } 811 812 list_for_each_entry(ifa, &idev->addr_list, if_list) { 813 if (ifa->flags&IFA_F_TENTATIVE) 814 continue; 815 if (idev->cnf.forwarding) 816 addrconf_join_anycast(ifa); 817 else 818 addrconf_leave_anycast(ifa); 819 } 820 inet6_netconf_notify_devconf(dev_net(dev), RTM_NEWNETCONF, 821 NETCONFA_FORWARDING, 822 dev->ifindex, &idev->cnf); 823 } 824 825 826 static void addrconf_forward_change(struct net *net, __s32 newf) 827 { 828 struct net_device *dev; 829 struct inet6_dev *idev; 830 831 for_each_netdev(net, dev) { 832 idev = __in6_dev_get(dev); 833 if (idev) { 834 int changed = (!idev->cnf.forwarding) ^ (!newf); 835 idev->cnf.forwarding = newf; 836 if (changed) 837 dev_forward_change(idev); 838 } 839 } 840 } 841 842 static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf) 843 { 844 struct net *net; 845 int old; 846 847 if (!rtnl_trylock()) 848 return restart_syscall(); 849 850 net = (struct net *)table->extra2; 851 old = *p; 852 *p = newf; 853 854 if (p == &net->ipv6.devconf_dflt->forwarding) { 855 if ((!newf) ^ (!old)) 856 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 857 NETCONFA_FORWARDING, 858 NETCONFA_IFINDEX_DEFAULT, 859 net->ipv6.devconf_dflt); 860 rtnl_unlock(); 861 return 0; 862 } 863 864 if (p == &net->ipv6.devconf_all->forwarding) { 865 int old_dflt = net->ipv6.devconf_dflt->forwarding; 866 867 net->ipv6.devconf_dflt->forwarding = newf; 868 if ((!newf) ^ (!old_dflt)) 869 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 870 NETCONFA_FORWARDING, 871 NETCONFA_IFINDEX_DEFAULT, 872 net->ipv6.devconf_dflt); 873 874 addrconf_forward_change(net, newf); 875 if ((!newf) ^ (!old)) 876 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 877 NETCONFA_FORWARDING, 878 NETCONFA_IFINDEX_ALL, 879 net->ipv6.devconf_all); 880 } else if ((!newf) ^ (!old)) 881 dev_forward_change((struct inet6_dev *)table->extra1); 882 rtnl_unlock(); 883 884 if (newf) 885 rt6_purge_dflt_routers(net); 886 return 1; 887 } 888 889 static void addrconf_linkdown_change(struct net *net, __s32 newf) 890 { 891 struct net_device *dev; 892 struct inet6_dev *idev; 893 894 for_each_netdev(net, dev) { 895 idev = __in6_dev_get(dev); 896 if (idev) { 897 int changed = (!idev->cnf.ignore_routes_with_linkdown) ^ (!newf); 898 899 idev->cnf.ignore_routes_with_linkdown = newf; 900 if (changed) 901 inet6_netconf_notify_devconf(dev_net(dev), 902 RTM_NEWNETCONF, 903 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN, 904 dev->ifindex, 905 &idev->cnf); 906 } 907 } 908 } 909 910 static int addrconf_fixup_linkdown(struct ctl_table *table, int *p, int newf) 911 { 912 struct net *net; 913 int old; 914 915 if (!rtnl_trylock()) 916 return restart_syscall(); 917 918 net = (struct net *)table->extra2; 919 old = *p; 920 *p = newf; 921 922 if (p == &net->ipv6.devconf_dflt->ignore_routes_with_linkdown) { 923 if ((!newf) ^ (!old)) 924 inet6_netconf_notify_devconf(net, 925 RTM_NEWNETCONF, 926 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN, 927 NETCONFA_IFINDEX_DEFAULT, 928 net->ipv6.devconf_dflt); 929 rtnl_unlock(); 930 return 0; 931 } 932 933 if (p == &net->ipv6.devconf_all->ignore_routes_with_linkdown) { 934 net->ipv6.devconf_dflt->ignore_routes_with_linkdown = newf; 935 addrconf_linkdown_change(net, newf); 936 if ((!newf) ^ (!old)) 937 inet6_netconf_notify_devconf(net, 938 RTM_NEWNETCONF, 939 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN, 940 NETCONFA_IFINDEX_ALL, 941 net->ipv6.devconf_all); 942 } 943 rtnl_unlock(); 944 945 return 1; 946 } 947 948 #endif 949 950 /* Nobody refers to this ifaddr, destroy it */ 951 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp) 952 { 953 WARN_ON(!hlist_unhashed(&ifp->addr_lst)); 954 955 #ifdef NET_REFCNT_DEBUG 956 pr_debug("%s\n", __func__); 957 #endif 958 959 in6_dev_put(ifp->idev); 960 961 if (cancel_delayed_work(&ifp->dad_work)) 962 pr_notice("delayed DAD work was pending while freeing ifa=%p\n", 963 ifp); 964 965 if (ifp->state != INET6_IFADDR_STATE_DEAD) { 966 pr_warn("Freeing alive inet6 address %p\n", ifp); 967 return; 968 } 969 970 kfree_rcu(ifp, rcu); 971 } 972 973 static void 974 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp) 975 { 976 struct list_head *p; 977 int ifp_scope = ipv6_addr_src_scope(&ifp->addr); 978 979 /* 980 * Each device address list is sorted in order of scope - 981 * global before linklocal. 982 */ 983 list_for_each(p, &idev->addr_list) { 984 struct inet6_ifaddr *ifa 985 = list_entry(p, struct inet6_ifaddr, if_list); 986 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr)) 987 break; 988 } 989 990 list_add_tail_rcu(&ifp->if_list, p); 991 } 992 993 static u32 inet6_addr_hash(const struct net *net, const struct in6_addr *addr) 994 { 995 u32 val = ipv6_addr_hash(addr) ^ net_hash_mix(net); 996 997 return hash_32(val, IN6_ADDR_HSIZE_SHIFT); 998 } 999 1000 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr, 1001 struct net_device *dev, unsigned int hash) 1002 { 1003 struct inet6_ifaddr *ifp; 1004 1005 hlist_for_each_entry(ifp, &inet6_addr_lst[hash], addr_lst) { 1006 if (!net_eq(dev_net(ifp->idev->dev), net)) 1007 continue; 1008 if (ipv6_addr_equal(&ifp->addr, addr)) { 1009 if (!dev || ifp->idev->dev == dev) 1010 return true; 1011 } 1012 } 1013 return false; 1014 } 1015 1016 static int ipv6_add_addr_hash(struct net_device *dev, struct inet6_ifaddr *ifa) 1017 { 1018 unsigned int hash = inet6_addr_hash(dev_net(dev), &ifa->addr); 1019 int err = 0; 1020 1021 spin_lock(&addrconf_hash_lock); 1022 1023 /* Ignore adding duplicate addresses on an interface */ 1024 if (ipv6_chk_same_addr(dev_net(dev), &ifa->addr, dev, hash)) { 1025 netdev_dbg(dev, "ipv6_add_addr: already assigned\n"); 1026 err = -EEXIST; 1027 } else { 1028 hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]); 1029 } 1030 1031 spin_unlock(&addrconf_hash_lock); 1032 1033 return err; 1034 } 1035 1036 /* On success it returns ifp with increased reference count */ 1037 1038 static struct inet6_ifaddr * 1039 ipv6_add_addr(struct inet6_dev *idev, struct ifa6_config *cfg, 1040 bool can_block, struct netlink_ext_ack *extack) 1041 { 1042 gfp_t gfp_flags = can_block ? GFP_KERNEL : GFP_ATOMIC; 1043 int addr_type = ipv6_addr_type(cfg->pfx); 1044 struct net *net = dev_net(idev->dev); 1045 struct inet6_ifaddr *ifa = NULL; 1046 struct fib6_info *f6i = NULL; 1047 int err = 0; 1048 1049 if (addr_type == IPV6_ADDR_ANY || 1050 (addr_type & IPV6_ADDR_MULTICAST && 1051 !(cfg->ifa_flags & IFA_F_MCAUTOJOIN)) || 1052 (!(idev->dev->flags & IFF_LOOPBACK) && 1053 !netif_is_l3_master(idev->dev) && 1054 addr_type & IPV6_ADDR_LOOPBACK)) 1055 return ERR_PTR(-EADDRNOTAVAIL); 1056 1057 if (idev->dead) { 1058 err = -ENODEV; /*XXX*/ 1059 goto out; 1060 } 1061 1062 if (idev->cnf.disable_ipv6) { 1063 err = -EACCES; 1064 goto out; 1065 } 1066 1067 /* validator notifier needs to be blocking; 1068 * do not call in atomic context 1069 */ 1070 if (can_block) { 1071 struct in6_validator_info i6vi = { 1072 .i6vi_addr = *cfg->pfx, 1073 .i6vi_dev = idev, 1074 .extack = extack, 1075 }; 1076 1077 err = inet6addr_validator_notifier_call_chain(NETDEV_UP, &i6vi); 1078 err = notifier_to_errno(err); 1079 if (err < 0) 1080 goto out; 1081 } 1082 1083 ifa = kzalloc(sizeof(*ifa), gfp_flags); 1084 if (!ifa) { 1085 err = -ENOBUFS; 1086 goto out; 1087 } 1088 1089 f6i = addrconf_f6i_alloc(net, idev, cfg->pfx, false, gfp_flags); 1090 if (IS_ERR(f6i)) { 1091 err = PTR_ERR(f6i); 1092 f6i = NULL; 1093 goto out; 1094 } 1095 1096 if (net->ipv6.devconf_all->disable_policy || 1097 idev->cnf.disable_policy) 1098 f6i->dst_nopolicy = true; 1099 1100 neigh_parms_data_state_setall(idev->nd_parms); 1101 1102 ifa->addr = *cfg->pfx; 1103 if (cfg->peer_pfx) 1104 ifa->peer_addr = *cfg->peer_pfx; 1105 1106 spin_lock_init(&ifa->lock); 1107 INIT_DELAYED_WORK(&ifa->dad_work, addrconf_dad_work); 1108 INIT_HLIST_NODE(&ifa->addr_lst); 1109 ifa->scope = cfg->scope; 1110 ifa->prefix_len = cfg->plen; 1111 ifa->rt_priority = cfg->rt_priority; 1112 ifa->flags = cfg->ifa_flags; 1113 /* No need to add the TENTATIVE flag for addresses with NODAD */ 1114 if (!(cfg->ifa_flags & IFA_F_NODAD)) 1115 ifa->flags |= IFA_F_TENTATIVE; 1116 ifa->valid_lft = cfg->valid_lft; 1117 ifa->prefered_lft = cfg->preferred_lft; 1118 ifa->cstamp = ifa->tstamp = jiffies; 1119 ifa->tokenized = false; 1120 1121 ifa->rt = f6i; 1122 1123 ifa->idev = idev; 1124 in6_dev_hold(idev); 1125 1126 /* For caller */ 1127 refcount_set(&ifa->refcnt, 1); 1128 1129 rcu_read_lock_bh(); 1130 1131 err = ipv6_add_addr_hash(idev->dev, ifa); 1132 if (err < 0) { 1133 rcu_read_unlock_bh(); 1134 goto out; 1135 } 1136 1137 write_lock(&idev->lock); 1138 1139 /* Add to inet6_dev unicast addr list. */ 1140 ipv6_link_dev_addr(idev, ifa); 1141 1142 if (ifa->flags&IFA_F_TEMPORARY) { 1143 list_add(&ifa->tmp_list, &idev->tempaddr_list); 1144 in6_ifa_hold(ifa); 1145 } 1146 1147 in6_ifa_hold(ifa); 1148 write_unlock(&idev->lock); 1149 1150 rcu_read_unlock_bh(); 1151 1152 inet6addr_notifier_call_chain(NETDEV_UP, ifa); 1153 out: 1154 if (unlikely(err < 0)) { 1155 fib6_info_release(f6i); 1156 1157 if (ifa) { 1158 if (ifa->idev) 1159 in6_dev_put(ifa->idev); 1160 kfree(ifa); 1161 } 1162 ifa = ERR_PTR(err); 1163 } 1164 1165 return ifa; 1166 } 1167 1168 enum cleanup_prefix_rt_t { 1169 CLEANUP_PREFIX_RT_NOP, /* no cleanup action for prefix route */ 1170 CLEANUP_PREFIX_RT_DEL, /* delete the prefix route */ 1171 CLEANUP_PREFIX_RT_EXPIRE, /* update the lifetime of the prefix route */ 1172 }; 1173 1174 /* 1175 * Check, whether the prefix for ifp would still need a prefix route 1176 * after deleting ifp. The function returns one of the CLEANUP_PREFIX_RT_* 1177 * constants. 1178 * 1179 * 1) we don't purge prefix if address was not permanent. 1180 * prefix is managed by its own lifetime. 1181 * 2) we also don't purge, if the address was IFA_F_NOPREFIXROUTE. 1182 * 3) if there are no addresses, delete prefix. 1183 * 4) if there are still other permanent address(es), 1184 * corresponding prefix is still permanent. 1185 * 5) if there are still other addresses with IFA_F_NOPREFIXROUTE, 1186 * don't purge the prefix, assume user space is managing it. 1187 * 6) otherwise, update prefix lifetime to the 1188 * longest valid lifetime among the corresponding 1189 * addresses on the device. 1190 * Note: subsequent RA will update lifetime. 1191 **/ 1192 static enum cleanup_prefix_rt_t 1193 check_cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long *expires) 1194 { 1195 struct inet6_ifaddr *ifa; 1196 struct inet6_dev *idev = ifp->idev; 1197 unsigned long lifetime; 1198 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_DEL; 1199 1200 *expires = jiffies; 1201 1202 list_for_each_entry(ifa, &idev->addr_list, if_list) { 1203 if (ifa == ifp) 1204 continue; 1205 if (ifa->prefix_len != ifp->prefix_len || 1206 !ipv6_prefix_equal(&ifa->addr, &ifp->addr, 1207 ifp->prefix_len)) 1208 continue; 1209 if (ifa->flags & (IFA_F_PERMANENT | IFA_F_NOPREFIXROUTE)) 1210 return CLEANUP_PREFIX_RT_NOP; 1211 1212 action = CLEANUP_PREFIX_RT_EXPIRE; 1213 1214 spin_lock(&ifa->lock); 1215 1216 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ); 1217 /* 1218 * Note: Because this address is 1219 * not permanent, lifetime < 1220 * LONG_MAX / HZ here. 1221 */ 1222 if (time_before(*expires, ifa->tstamp + lifetime * HZ)) 1223 *expires = ifa->tstamp + lifetime * HZ; 1224 spin_unlock(&ifa->lock); 1225 } 1226 1227 return action; 1228 } 1229 1230 static void 1231 cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long expires, 1232 bool del_rt, bool del_peer) 1233 { 1234 struct fib6_info *f6i; 1235 1236 f6i = addrconf_get_prefix_route(del_peer ? &ifp->peer_addr : &ifp->addr, 1237 ifp->prefix_len, 1238 ifp->idev->dev, 0, RTF_DEFAULT, true); 1239 if (f6i) { 1240 if (del_rt) 1241 ip6_del_rt(dev_net(ifp->idev->dev), f6i, false); 1242 else { 1243 if (!(f6i->fib6_flags & RTF_EXPIRES)) 1244 fib6_set_expires(f6i, expires); 1245 fib6_info_release(f6i); 1246 } 1247 } 1248 } 1249 1250 1251 /* This function wants to get referenced ifp and releases it before return */ 1252 1253 static void ipv6_del_addr(struct inet6_ifaddr *ifp) 1254 { 1255 int state; 1256 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_NOP; 1257 unsigned long expires; 1258 1259 ASSERT_RTNL(); 1260 1261 spin_lock_bh(&ifp->lock); 1262 state = ifp->state; 1263 ifp->state = INET6_IFADDR_STATE_DEAD; 1264 spin_unlock_bh(&ifp->lock); 1265 1266 if (state == INET6_IFADDR_STATE_DEAD) 1267 goto out; 1268 1269 spin_lock_bh(&addrconf_hash_lock); 1270 hlist_del_init_rcu(&ifp->addr_lst); 1271 spin_unlock_bh(&addrconf_hash_lock); 1272 1273 write_lock_bh(&ifp->idev->lock); 1274 1275 if (ifp->flags&IFA_F_TEMPORARY) { 1276 list_del(&ifp->tmp_list); 1277 if (ifp->ifpub) { 1278 in6_ifa_put(ifp->ifpub); 1279 ifp->ifpub = NULL; 1280 } 1281 __in6_ifa_put(ifp); 1282 } 1283 1284 if (ifp->flags & IFA_F_PERMANENT && !(ifp->flags & IFA_F_NOPREFIXROUTE)) 1285 action = check_cleanup_prefix_route(ifp, &expires); 1286 1287 list_del_rcu(&ifp->if_list); 1288 __in6_ifa_put(ifp); 1289 1290 write_unlock_bh(&ifp->idev->lock); 1291 1292 addrconf_del_dad_work(ifp); 1293 1294 ipv6_ifa_notify(RTM_DELADDR, ifp); 1295 1296 inet6addr_notifier_call_chain(NETDEV_DOWN, ifp); 1297 1298 if (action != CLEANUP_PREFIX_RT_NOP) { 1299 cleanup_prefix_route(ifp, expires, 1300 action == CLEANUP_PREFIX_RT_DEL, false); 1301 } 1302 1303 /* clean up prefsrc entries */ 1304 rt6_remove_prefsrc(ifp); 1305 out: 1306 in6_ifa_put(ifp); 1307 } 1308 1309 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, bool block) 1310 { 1311 struct inet6_dev *idev = ifp->idev; 1312 unsigned long tmp_tstamp, age; 1313 unsigned long regen_advance; 1314 unsigned long now = jiffies; 1315 s32 cnf_temp_preferred_lft; 1316 struct inet6_ifaddr *ift; 1317 struct ifa6_config cfg; 1318 long max_desync_factor; 1319 struct in6_addr addr; 1320 int ret = 0; 1321 1322 write_lock_bh(&idev->lock); 1323 1324 retry: 1325 in6_dev_hold(idev); 1326 if (idev->cnf.use_tempaddr <= 0) { 1327 write_unlock_bh(&idev->lock); 1328 pr_info("%s: use_tempaddr is disabled\n", __func__); 1329 in6_dev_put(idev); 1330 ret = -1; 1331 goto out; 1332 } 1333 spin_lock_bh(&ifp->lock); 1334 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) { 1335 idev->cnf.use_tempaddr = -1; /*XXX*/ 1336 spin_unlock_bh(&ifp->lock); 1337 write_unlock_bh(&idev->lock); 1338 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n", 1339 __func__); 1340 in6_dev_put(idev); 1341 ret = -1; 1342 goto out; 1343 } 1344 in6_ifa_hold(ifp); 1345 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8); 1346 ipv6_gen_rnd_iid(&addr); 1347 1348 age = (now - ifp->tstamp) / HZ; 1349 1350 regen_advance = idev->cnf.regen_max_retry * 1351 idev->cnf.dad_transmits * 1352 max(NEIGH_VAR(idev->nd_parms, RETRANS_TIME), HZ/100) / HZ; 1353 1354 /* recalculate max_desync_factor each time and update 1355 * idev->desync_factor if it's larger 1356 */ 1357 cnf_temp_preferred_lft = READ_ONCE(idev->cnf.temp_prefered_lft); 1358 max_desync_factor = min_t(__u32, 1359 idev->cnf.max_desync_factor, 1360 cnf_temp_preferred_lft - regen_advance); 1361 1362 if (unlikely(idev->desync_factor > max_desync_factor)) { 1363 if (max_desync_factor > 0) { 1364 get_random_bytes(&idev->desync_factor, 1365 sizeof(idev->desync_factor)); 1366 idev->desync_factor %= max_desync_factor; 1367 } else { 1368 idev->desync_factor = 0; 1369 } 1370 } 1371 1372 memset(&cfg, 0, sizeof(cfg)); 1373 cfg.valid_lft = min_t(__u32, ifp->valid_lft, 1374 idev->cnf.temp_valid_lft + age); 1375 cfg.preferred_lft = cnf_temp_preferred_lft + age - idev->desync_factor; 1376 cfg.preferred_lft = min_t(__u32, ifp->prefered_lft, cfg.preferred_lft); 1377 1378 cfg.plen = ifp->prefix_len; 1379 tmp_tstamp = ifp->tstamp; 1380 spin_unlock_bh(&ifp->lock); 1381 1382 write_unlock_bh(&idev->lock); 1383 1384 /* A temporary address is created only if this calculated Preferred 1385 * Lifetime is greater than REGEN_ADVANCE time units. In particular, 1386 * an implementation must not create a temporary address with a zero 1387 * Preferred Lifetime. 1388 * Use age calculation as in addrconf_verify to avoid unnecessary 1389 * temporary addresses being generated. 1390 */ 1391 age = (now - tmp_tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ; 1392 if (cfg.preferred_lft <= regen_advance + age) { 1393 in6_ifa_put(ifp); 1394 in6_dev_put(idev); 1395 ret = -1; 1396 goto out; 1397 } 1398 1399 cfg.ifa_flags = IFA_F_TEMPORARY; 1400 /* set in addrconf_prefix_rcv() */ 1401 if (ifp->flags & IFA_F_OPTIMISTIC) 1402 cfg.ifa_flags |= IFA_F_OPTIMISTIC; 1403 1404 cfg.pfx = &addr; 1405 cfg.scope = ipv6_addr_scope(cfg.pfx); 1406 1407 ift = ipv6_add_addr(idev, &cfg, block, NULL); 1408 if (IS_ERR(ift)) { 1409 in6_ifa_put(ifp); 1410 in6_dev_put(idev); 1411 pr_info("%s: retry temporary address regeneration\n", __func__); 1412 write_lock_bh(&idev->lock); 1413 goto retry; 1414 } 1415 1416 spin_lock_bh(&ift->lock); 1417 ift->ifpub = ifp; 1418 ift->cstamp = now; 1419 ift->tstamp = tmp_tstamp; 1420 spin_unlock_bh(&ift->lock); 1421 1422 addrconf_dad_start(ift); 1423 in6_ifa_put(ift); 1424 in6_dev_put(idev); 1425 out: 1426 return ret; 1427 } 1428 1429 /* 1430 * Choose an appropriate source address (RFC3484) 1431 */ 1432 enum { 1433 IPV6_SADDR_RULE_INIT = 0, 1434 IPV6_SADDR_RULE_LOCAL, 1435 IPV6_SADDR_RULE_SCOPE, 1436 IPV6_SADDR_RULE_PREFERRED, 1437 #ifdef CONFIG_IPV6_MIP6 1438 IPV6_SADDR_RULE_HOA, 1439 #endif 1440 IPV6_SADDR_RULE_OIF, 1441 IPV6_SADDR_RULE_LABEL, 1442 IPV6_SADDR_RULE_PRIVACY, 1443 IPV6_SADDR_RULE_ORCHID, 1444 IPV6_SADDR_RULE_PREFIX, 1445 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1446 IPV6_SADDR_RULE_NOT_OPTIMISTIC, 1447 #endif 1448 IPV6_SADDR_RULE_MAX 1449 }; 1450 1451 struct ipv6_saddr_score { 1452 int rule; 1453 int addr_type; 1454 struct inet6_ifaddr *ifa; 1455 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX); 1456 int scopedist; 1457 int matchlen; 1458 }; 1459 1460 struct ipv6_saddr_dst { 1461 const struct in6_addr *addr; 1462 int ifindex; 1463 int scope; 1464 int label; 1465 unsigned int prefs; 1466 }; 1467 1468 static inline int ipv6_saddr_preferred(int type) 1469 { 1470 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK)) 1471 return 1; 1472 return 0; 1473 } 1474 1475 static bool ipv6_use_optimistic_addr(struct net *net, 1476 struct inet6_dev *idev) 1477 { 1478 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1479 if (!idev) 1480 return false; 1481 if (!net->ipv6.devconf_all->optimistic_dad && !idev->cnf.optimistic_dad) 1482 return false; 1483 if (!net->ipv6.devconf_all->use_optimistic && !idev->cnf.use_optimistic) 1484 return false; 1485 1486 return true; 1487 #else 1488 return false; 1489 #endif 1490 } 1491 1492 static bool ipv6_allow_optimistic_dad(struct net *net, 1493 struct inet6_dev *idev) 1494 { 1495 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1496 if (!idev) 1497 return false; 1498 if (!net->ipv6.devconf_all->optimistic_dad && !idev->cnf.optimistic_dad) 1499 return false; 1500 1501 return true; 1502 #else 1503 return false; 1504 #endif 1505 } 1506 1507 static int ipv6_get_saddr_eval(struct net *net, 1508 struct ipv6_saddr_score *score, 1509 struct ipv6_saddr_dst *dst, 1510 int i) 1511 { 1512 int ret; 1513 1514 if (i <= score->rule) { 1515 switch (i) { 1516 case IPV6_SADDR_RULE_SCOPE: 1517 ret = score->scopedist; 1518 break; 1519 case IPV6_SADDR_RULE_PREFIX: 1520 ret = score->matchlen; 1521 break; 1522 default: 1523 ret = !!test_bit(i, score->scorebits); 1524 } 1525 goto out; 1526 } 1527 1528 switch (i) { 1529 case IPV6_SADDR_RULE_INIT: 1530 /* Rule 0: remember if hiscore is not ready yet */ 1531 ret = !!score->ifa; 1532 break; 1533 case IPV6_SADDR_RULE_LOCAL: 1534 /* Rule 1: Prefer same address */ 1535 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr); 1536 break; 1537 case IPV6_SADDR_RULE_SCOPE: 1538 /* Rule 2: Prefer appropriate scope 1539 * 1540 * ret 1541 * ^ 1542 * -1 | d 15 1543 * ---+--+-+---> scope 1544 * | 1545 * | d is scope of the destination. 1546 * B-d | \ 1547 * | \ <- smaller scope is better if 1548 * B-15 | \ if scope is enough for destination. 1549 * | ret = B - scope (-1 <= scope >= d <= 15). 1550 * d-C-1 | / 1551 * |/ <- greater is better 1552 * -C / if scope is not enough for destination. 1553 * /| ret = scope - C (-1 <= d < scope <= 15). 1554 * 1555 * d - C - 1 < B -15 (for all -1 <= d <= 15). 1556 * C > d + 14 - B >= 15 + 14 - B = 29 - B. 1557 * Assume B = 0 and we get C > 29. 1558 */ 1559 ret = __ipv6_addr_src_scope(score->addr_type); 1560 if (ret >= dst->scope) 1561 ret = -ret; 1562 else 1563 ret -= 128; /* 30 is enough */ 1564 score->scopedist = ret; 1565 break; 1566 case IPV6_SADDR_RULE_PREFERRED: 1567 { 1568 /* Rule 3: Avoid deprecated and optimistic addresses */ 1569 u8 avoid = IFA_F_DEPRECATED; 1570 1571 if (!ipv6_use_optimistic_addr(net, score->ifa->idev)) 1572 avoid |= IFA_F_OPTIMISTIC; 1573 ret = ipv6_saddr_preferred(score->addr_type) || 1574 !(score->ifa->flags & avoid); 1575 break; 1576 } 1577 #ifdef CONFIG_IPV6_MIP6 1578 case IPV6_SADDR_RULE_HOA: 1579 { 1580 /* Rule 4: Prefer home address */ 1581 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA); 1582 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome; 1583 break; 1584 } 1585 #endif 1586 case IPV6_SADDR_RULE_OIF: 1587 /* Rule 5: Prefer outgoing interface */ 1588 ret = (!dst->ifindex || 1589 dst->ifindex == score->ifa->idev->dev->ifindex); 1590 break; 1591 case IPV6_SADDR_RULE_LABEL: 1592 /* Rule 6: Prefer matching label */ 1593 ret = ipv6_addr_label(net, 1594 &score->ifa->addr, score->addr_type, 1595 score->ifa->idev->dev->ifindex) == dst->label; 1596 break; 1597 case IPV6_SADDR_RULE_PRIVACY: 1598 { 1599 /* Rule 7: Prefer public address 1600 * Note: prefer temporary address if use_tempaddr >= 2 1601 */ 1602 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ? 1603 !!(dst->prefs & IPV6_PREFER_SRC_TMP) : 1604 score->ifa->idev->cnf.use_tempaddr >= 2; 1605 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp; 1606 break; 1607 } 1608 case IPV6_SADDR_RULE_ORCHID: 1609 /* Rule 8-: Prefer ORCHID vs ORCHID or 1610 * non-ORCHID vs non-ORCHID 1611 */ 1612 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^ 1613 ipv6_addr_orchid(dst->addr)); 1614 break; 1615 case IPV6_SADDR_RULE_PREFIX: 1616 /* Rule 8: Use longest matching prefix */ 1617 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr); 1618 if (ret > score->ifa->prefix_len) 1619 ret = score->ifa->prefix_len; 1620 score->matchlen = ret; 1621 break; 1622 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1623 case IPV6_SADDR_RULE_NOT_OPTIMISTIC: 1624 /* Optimistic addresses still have lower precedence than other 1625 * preferred addresses. 1626 */ 1627 ret = !(score->ifa->flags & IFA_F_OPTIMISTIC); 1628 break; 1629 #endif 1630 default: 1631 ret = 0; 1632 } 1633 1634 if (ret) 1635 __set_bit(i, score->scorebits); 1636 score->rule = i; 1637 out: 1638 return ret; 1639 } 1640 1641 static int __ipv6_dev_get_saddr(struct net *net, 1642 struct ipv6_saddr_dst *dst, 1643 struct inet6_dev *idev, 1644 struct ipv6_saddr_score *scores, 1645 int hiscore_idx) 1646 { 1647 struct ipv6_saddr_score *score = &scores[1 - hiscore_idx], *hiscore = &scores[hiscore_idx]; 1648 1649 list_for_each_entry_rcu(score->ifa, &idev->addr_list, if_list) { 1650 int i; 1651 1652 /* 1653 * - Tentative Address (RFC2462 section 5.4) 1654 * - A tentative address is not considered 1655 * "assigned to an interface" in the traditional 1656 * sense, unless it is also flagged as optimistic. 1657 * - Candidate Source Address (section 4) 1658 * - In any case, anycast addresses, multicast 1659 * addresses, and the unspecified address MUST 1660 * NOT be included in a candidate set. 1661 */ 1662 if ((score->ifa->flags & IFA_F_TENTATIVE) && 1663 (!(score->ifa->flags & IFA_F_OPTIMISTIC))) 1664 continue; 1665 1666 score->addr_type = __ipv6_addr_type(&score->ifa->addr); 1667 1668 if (unlikely(score->addr_type == IPV6_ADDR_ANY || 1669 score->addr_type & IPV6_ADDR_MULTICAST)) { 1670 net_dbg_ratelimited("ADDRCONF: unspecified / multicast address assigned as unicast address on %s", 1671 idev->dev->name); 1672 continue; 1673 } 1674 1675 score->rule = -1; 1676 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX); 1677 1678 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) { 1679 int minihiscore, miniscore; 1680 1681 minihiscore = ipv6_get_saddr_eval(net, hiscore, dst, i); 1682 miniscore = ipv6_get_saddr_eval(net, score, dst, i); 1683 1684 if (minihiscore > miniscore) { 1685 if (i == IPV6_SADDR_RULE_SCOPE && 1686 score->scopedist > 0) { 1687 /* 1688 * special case: 1689 * each remaining entry 1690 * has too small (not enough) 1691 * scope, because ifa entries 1692 * are sorted by their scope 1693 * values. 1694 */ 1695 goto out; 1696 } 1697 break; 1698 } else if (minihiscore < miniscore) { 1699 swap(hiscore, score); 1700 hiscore_idx = 1 - hiscore_idx; 1701 1702 /* restore our iterator */ 1703 score->ifa = hiscore->ifa; 1704 1705 break; 1706 } 1707 } 1708 } 1709 out: 1710 return hiscore_idx; 1711 } 1712 1713 static int ipv6_get_saddr_master(struct net *net, 1714 const struct net_device *dst_dev, 1715 const struct net_device *master, 1716 struct ipv6_saddr_dst *dst, 1717 struct ipv6_saddr_score *scores, 1718 int hiscore_idx) 1719 { 1720 struct inet6_dev *idev; 1721 1722 idev = __in6_dev_get(dst_dev); 1723 if (idev) 1724 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev, 1725 scores, hiscore_idx); 1726 1727 idev = __in6_dev_get(master); 1728 if (idev) 1729 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev, 1730 scores, hiscore_idx); 1731 1732 return hiscore_idx; 1733 } 1734 1735 int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev, 1736 const struct in6_addr *daddr, unsigned int prefs, 1737 struct in6_addr *saddr) 1738 { 1739 struct ipv6_saddr_score scores[2], *hiscore; 1740 struct ipv6_saddr_dst dst; 1741 struct inet6_dev *idev; 1742 struct net_device *dev; 1743 int dst_type; 1744 bool use_oif_addr = false; 1745 int hiscore_idx = 0; 1746 int ret = 0; 1747 1748 dst_type = __ipv6_addr_type(daddr); 1749 dst.addr = daddr; 1750 dst.ifindex = dst_dev ? dst_dev->ifindex : 0; 1751 dst.scope = __ipv6_addr_src_scope(dst_type); 1752 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex); 1753 dst.prefs = prefs; 1754 1755 scores[hiscore_idx].rule = -1; 1756 scores[hiscore_idx].ifa = NULL; 1757 1758 rcu_read_lock(); 1759 1760 /* Candidate Source Address (section 4) 1761 * - multicast and link-local destination address, 1762 * the set of candidate source address MUST only 1763 * include addresses assigned to interfaces 1764 * belonging to the same link as the outgoing 1765 * interface. 1766 * (- For site-local destination addresses, the 1767 * set of candidate source addresses MUST only 1768 * include addresses assigned to interfaces 1769 * belonging to the same site as the outgoing 1770 * interface.) 1771 * - "It is RECOMMENDED that the candidate source addresses 1772 * be the set of unicast addresses assigned to the 1773 * interface that will be used to send to the destination 1774 * (the 'outgoing' interface)." (RFC 6724) 1775 */ 1776 if (dst_dev) { 1777 idev = __in6_dev_get(dst_dev); 1778 if ((dst_type & IPV6_ADDR_MULTICAST) || 1779 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL || 1780 (idev && idev->cnf.use_oif_addrs_only)) { 1781 use_oif_addr = true; 1782 } 1783 } 1784 1785 if (use_oif_addr) { 1786 if (idev) 1787 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx); 1788 } else { 1789 const struct net_device *master; 1790 int master_idx = 0; 1791 1792 /* if dst_dev exists and is enslaved to an L3 device, then 1793 * prefer addresses from dst_dev and then the master over 1794 * any other enslaved devices in the L3 domain. 1795 */ 1796 master = l3mdev_master_dev_rcu(dst_dev); 1797 if (master) { 1798 master_idx = master->ifindex; 1799 1800 hiscore_idx = ipv6_get_saddr_master(net, dst_dev, 1801 master, &dst, 1802 scores, hiscore_idx); 1803 1804 if (scores[hiscore_idx].ifa) 1805 goto out; 1806 } 1807 1808 for_each_netdev_rcu(net, dev) { 1809 /* only consider addresses on devices in the 1810 * same L3 domain 1811 */ 1812 if (l3mdev_master_ifindex_rcu(dev) != master_idx) 1813 continue; 1814 idev = __in6_dev_get(dev); 1815 if (!idev) 1816 continue; 1817 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx); 1818 } 1819 } 1820 1821 out: 1822 hiscore = &scores[hiscore_idx]; 1823 if (!hiscore->ifa) 1824 ret = -EADDRNOTAVAIL; 1825 else 1826 *saddr = hiscore->ifa->addr; 1827 1828 rcu_read_unlock(); 1829 return ret; 1830 } 1831 EXPORT_SYMBOL(ipv6_dev_get_saddr); 1832 1833 int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr, 1834 u32 banned_flags) 1835 { 1836 struct inet6_ifaddr *ifp; 1837 int err = -EADDRNOTAVAIL; 1838 1839 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) { 1840 if (ifp->scope > IFA_LINK) 1841 break; 1842 if (ifp->scope == IFA_LINK && 1843 !(ifp->flags & banned_flags)) { 1844 *addr = ifp->addr; 1845 err = 0; 1846 break; 1847 } 1848 } 1849 return err; 1850 } 1851 1852 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr, 1853 u32 banned_flags) 1854 { 1855 struct inet6_dev *idev; 1856 int err = -EADDRNOTAVAIL; 1857 1858 rcu_read_lock(); 1859 idev = __in6_dev_get(dev); 1860 if (idev) { 1861 read_lock_bh(&idev->lock); 1862 err = __ipv6_get_lladdr(idev, addr, banned_flags); 1863 read_unlock_bh(&idev->lock); 1864 } 1865 rcu_read_unlock(); 1866 return err; 1867 } 1868 1869 static int ipv6_count_addresses(const struct inet6_dev *idev) 1870 { 1871 const struct inet6_ifaddr *ifp; 1872 int cnt = 0; 1873 1874 rcu_read_lock(); 1875 list_for_each_entry_rcu(ifp, &idev->addr_list, if_list) 1876 cnt++; 1877 rcu_read_unlock(); 1878 return cnt; 1879 } 1880 1881 int ipv6_chk_addr(struct net *net, const struct in6_addr *addr, 1882 const struct net_device *dev, int strict) 1883 { 1884 return ipv6_chk_addr_and_flags(net, addr, dev, !dev, 1885 strict, IFA_F_TENTATIVE); 1886 } 1887 EXPORT_SYMBOL(ipv6_chk_addr); 1888 1889 /* device argument is used to find the L3 domain of interest. If 1890 * skip_dev_check is set, then the ifp device is not checked against 1891 * the passed in dev argument. So the 2 cases for addresses checks are: 1892 * 1. does the address exist in the L3 domain that dev is part of 1893 * (skip_dev_check = true), or 1894 * 1895 * 2. does the address exist on the specific device 1896 * (skip_dev_check = false) 1897 */ 1898 static struct net_device * 1899 __ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr, 1900 const struct net_device *dev, bool skip_dev_check, 1901 int strict, u32 banned_flags) 1902 { 1903 unsigned int hash = inet6_addr_hash(net, addr); 1904 struct net_device *l3mdev, *ndev; 1905 struct inet6_ifaddr *ifp; 1906 u32 ifp_flags; 1907 1908 rcu_read_lock(); 1909 1910 l3mdev = l3mdev_master_dev_rcu(dev); 1911 if (skip_dev_check) 1912 dev = NULL; 1913 1914 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) { 1915 ndev = ifp->idev->dev; 1916 if (!net_eq(dev_net(ndev), net)) 1917 continue; 1918 1919 if (l3mdev_master_dev_rcu(ndev) != l3mdev) 1920 continue; 1921 1922 /* Decouple optimistic from tentative for evaluation here. 1923 * Ban optimistic addresses explicitly, when required. 1924 */ 1925 ifp_flags = (ifp->flags&IFA_F_OPTIMISTIC) 1926 ? (ifp->flags&~IFA_F_TENTATIVE) 1927 : ifp->flags; 1928 if (ipv6_addr_equal(&ifp->addr, addr) && 1929 !(ifp_flags&banned_flags) && 1930 (!dev || ndev == dev || 1931 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) { 1932 rcu_read_unlock(); 1933 return ndev; 1934 } 1935 } 1936 1937 rcu_read_unlock(); 1938 return NULL; 1939 } 1940 1941 int ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr, 1942 const struct net_device *dev, bool skip_dev_check, 1943 int strict, u32 banned_flags) 1944 { 1945 return __ipv6_chk_addr_and_flags(net, addr, dev, skip_dev_check, 1946 strict, banned_flags) ? 1 : 0; 1947 } 1948 EXPORT_SYMBOL(ipv6_chk_addr_and_flags); 1949 1950 1951 /* Compares an address/prefix_len with addresses on device @dev. 1952 * If one is found it returns true. 1953 */ 1954 bool ipv6_chk_custom_prefix(const struct in6_addr *addr, 1955 const unsigned int prefix_len, struct net_device *dev) 1956 { 1957 const struct inet6_ifaddr *ifa; 1958 const struct inet6_dev *idev; 1959 bool ret = false; 1960 1961 rcu_read_lock(); 1962 idev = __in6_dev_get(dev); 1963 if (idev) { 1964 list_for_each_entry_rcu(ifa, &idev->addr_list, if_list) { 1965 ret = ipv6_prefix_equal(addr, &ifa->addr, prefix_len); 1966 if (ret) 1967 break; 1968 } 1969 } 1970 rcu_read_unlock(); 1971 1972 return ret; 1973 } 1974 EXPORT_SYMBOL(ipv6_chk_custom_prefix); 1975 1976 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev) 1977 { 1978 const struct inet6_ifaddr *ifa; 1979 const struct inet6_dev *idev; 1980 int onlink; 1981 1982 onlink = 0; 1983 rcu_read_lock(); 1984 idev = __in6_dev_get(dev); 1985 if (idev) { 1986 list_for_each_entry_rcu(ifa, &idev->addr_list, if_list) { 1987 onlink = ipv6_prefix_equal(addr, &ifa->addr, 1988 ifa->prefix_len); 1989 if (onlink) 1990 break; 1991 } 1992 } 1993 rcu_read_unlock(); 1994 return onlink; 1995 } 1996 EXPORT_SYMBOL(ipv6_chk_prefix); 1997 1998 /** 1999 * ipv6_dev_find - find the first device with a given source address. 2000 * @net: the net namespace 2001 * @addr: the source address 2002 * @dev: used to find the L3 domain of interest 2003 * 2004 * The caller should be protected by RCU, or RTNL. 2005 */ 2006 struct net_device *ipv6_dev_find(struct net *net, const struct in6_addr *addr, 2007 struct net_device *dev) 2008 { 2009 return __ipv6_chk_addr_and_flags(net, addr, dev, !dev, 1, 2010 IFA_F_TENTATIVE); 2011 } 2012 EXPORT_SYMBOL(ipv6_dev_find); 2013 2014 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr, 2015 struct net_device *dev, int strict) 2016 { 2017 unsigned int hash = inet6_addr_hash(net, addr); 2018 struct inet6_ifaddr *ifp, *result = NULL; 2019 2020 rcu_read_lock(); 2021 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) { 2022 if (!net_eq(dev_net(ifp->idev->dev), net)) 2023 continue; 2024 if (ipv6_addr_equal(&ifp->addr, addr)) { 2025 if (!dev || ifp->idev->dev == dev || 2026 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) { 2027 result = ifp; 2028 in6_ifa_hold(ifp); 2029 break; 2030 } 2031 } 2032 } 2033 rcu_read_unlock(); 2034 2035 return result; 2036 } 2037 2038 /* Gets referenced address, destroys ifaddr */ 2039 2040 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed) 2041 { 2042 if (dad_failed) 2043 ifp->flags |= IFA_F_DADFAILED; 2044 2045 if (ifp->flags&IFA_F_TEMPORARY) { 2046 struct inet6_ifaddr *ifpub; 2047 spin_lock_bh(&ifp->lock); 2048 ifpub = ifp->ifpub; 2049 if (ifpub) { 2050 in6_ifa_hold(ifpub); 2051 spin_unlock_bh(&ifp->lock); 2052 ipv6_create_tempaddr(ifpub, true); 2053 in6_ifa_put(ifpub); 2054 } else { 2055 spin_unlock_bh(&ifp->lock); 2056 } 2057 ipv6_del_addr(ifp); 2058 } else if (ifp->flags&IFA_F_PERMANENT || !dad_failed) { 2059 spin_lock_bh(&ifp->lock); 2060 addrconf_del_dad_work(ifp); 2061 ifp->flags |= IFA_F_TENTATIVE; 2062 if (dad_failed) 2063 ifp->flags &= ~IFA_F_OPTIMISTIC; 2064 spin_unlock_bh(&ifp->lock); 2065 if (dad_failed) 2066 ipv6_ifa_notify(0, ifp); 2067 in6_ifa_put(ifp); 2068 } else { 2069 ipv6_del_addr(ifp); 2070 } 2071 } 2072 2073 static int addrconf_dad_end(struct inet6_ifaddr *ifp) 2074 { 2075 int err = -ENOENT; 2076 2077 spin_lock_bh(&ifp->lock); 2078 if (ifp->state == INET6_IFADDR_STATE_DAD) { 2079 ifp->state = INET6_IFADDR_STATE_POSTDAD; 2080 err = 0; 2081 } 2082 spin_unlock_bh(&ifp->lock); 2083 2084 return err; 2085 } 2086 2087 void addrconf_dad_failure(struct sk_buff *skb, struct inet6_ifaddr *ifp) 2088 { 2089 struct inet6_dev *idev = ifp->idev; 2090 struct net *net = dev_net(ifp->idev->dev); 2091 2092 if (addrconf_dad_end(ifp)) { 2093 in6_ifa_put(ifp); 2094 return; 2095 } 2096 2097 net_info_ratelimited("%s: IPv6 duplicate address %pI6c used by %pM detected!\n", 2098 ifp->idev->dev->name, &ifp->addr, eth_hdr(skb)->h_source); 2099 2100 spin_lock_bh(&ifp->lock); 2101 2102 if (ifp->flags & IFA_F_STABLE_PRIVACY) { 2103 struct in6_addr new_addr; 2104 struct inet6_ifaddr *ifp2; 2105 int retries = ifp->stable_privacy_retry + 1; 2106 struct ifa6_config cfg = { 2107 .pfx = &new_addr, 2108 .plen = ifp->prefix_len, 2109 .ifa_flags = ifp->flags, 2110 .valid_lft = ifp->valid_lft, 2111 .preferred_lft = ifp->prefered_lft, 2112 .scope = ifp->scope, 2113 }; 2114 2115 if (retries > net->ipv6.sysctl.idgen_retries) { 2116 net_info_ratelimited("%s: privacy stable address generation failed because of DAD conflicts!\n", 2117 ifp->idev->dev->name); 2118 goto errdad; 2119 } 2120 2121 new_addr = ifp->addr; 2122 if (ipv6_generate_stable_address(&new_addr, retries, 2123 idev)) 2124 goto errdad; 2125 2126 spin_unlock_bh(&ifp->lock); 2127 2128 if (idev->cnf.max_addresses && 2129 ipv6_count_addresses(idev) >= 2130 idev->cnf.max_addresses) 2131 goto lock_errdad; 2132 2133 net_info_ratelimited("%s: generating new stable privacy address because of DAD conflict\n", 2134 ifp->idev->dev->name); 2135 2136 ifp2 = ipv6_add_addr(idev, &cfg, false, NULL); 2137 if (IS_ERR(ifp2)) 2138 goto lock_errdad; 2139 2140 spin_lock_bh(&ifp2->lock); 2141 ifp2->stable_privacy_retry = retries; 2142 ifp2->state = INET6_IFADDR_STATE_PREDAD; 2143 spin_unlock_bh(&ifp2->lock); 2144 2145 addrconf_mod_dad_work(ifp2, net->ipv6.sysctl.idgen_delay); 2146 in6_ifa_put(ifp2); 2147 lock_errdad: 2148 spin_lock_bh(&ifp->lock); 2149 } 2150 2151 errdad: 2152 /* transition from _POSTDAD to _ERRDAD */ 2153 ifp->state = INET6_IFADDR_STATE_ERRDAD; 2154 spin_unlock_bh(&ifp->lock); 2155 2156 addrconf_mod_dad_work(ifp, 0); 2157 in6_ifa_put(ifp); 2158 } 2159 2160 /* Join to solicited addr multicast group. 2161 * caller must hold RTNL */ 2162 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr) 2163 { 2164 struct in6_addr maddr; 2165 2166 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP)) 2167 return; 2168 2169 addrconf_addr_solict_mult(addr, &maddr); 2170 ipv6_dev_mc_inc(dev, &maddr); 2171 } 2172 2173 /* caller must hold RTNL */ 2174 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr) 2175 { 2176 struct in6_addr maddr; 2177 2178 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP)) 2179 return; 2180 2181 addrconf_addr_solict_mult(addr, &maddr); 2182 __ipv6_dev_mc_dec(idev, &maddr); 2183 } 2184 2185 /* caller must hold RTNL */ 2186 static void addrconf_join_anycast(struct inet6_ifaddr *ifp) 2187 { 2188 struct in6_addr addr; 2189 2190 if (ifp->prefix_len >= 127) /* RFC 6164 */ 2191 return; 2192 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len); 2193 if (ipv6_addr_any(&addr)) 2194 return; 2195 __ipv6_dev_ac_inc(ifp->idev, &addr); 2196 } 2197 2198 /* caller must hold RTNL */ 2199 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp) 2200 { 2201 struct in6_addr addr; 2202 2203 if (ifp->prefix_len >= 127) /* RFC 6164 */ 2204 return; 2205 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len); 2206 if (ipv6_addr_any(&addr)) 2207 return; 2208 __ipv6_dev_ac_dec(ifp->idev, &addr); 2209 } 2210 2211 static int addrconf_ifid_6lowpan(u8 *eui, struct net_device *dev) 2212 { 2213 switch (dev->addr_len) { 2214 case ETH_ALEN: 2215 memcpy(eui, dev->dev_addr, 3); 2216 eui[3] = 0xFF; 2217 eui[4] = 0xFE; 2218 memcpy(eui + 5, dev->dev_addr + 3, 3); 2219 break; 2220 case EUI64_ADDR_LEN: 2221 memcpy(eui, dev->dev_addr, EUI64_ADDR_LEN); 2222 eui[0] ^= 2; 2223 break; 2224 default: 2225 return -1; 2226 } 2227 2228 return 0; 2229 } 2230 2231 static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev) 2232 { 2233 union fwnet_hwaddr *ha; 2234 2235 if (dev->addr_len != FWNET_ALEN) 2236 return -1; 2237 2238 ha = (union fwnet_hwaddr *)dev->dev_addr; 2239 2240 memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id)); 2241 eui[0] ^= 2; 2242 return 0; 2243 } 2244 2245 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev) 2246 { 2247 /* XXX: inherit EUI-64 from other interface -- yoshfuji */ 2248 if (dev->addr_len != ARCNET_ALEN) 2249 return -1; 2250 memset(eui, 0, 7); 2251 eui[7] = *(u8 *)dev->dev_addr; 2252 return 0; 2253 } 2254 2255 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev) 2256 { 2257 if (dev->addr_len != INFINIBAND_ALEN) 2258 return -1; 2259 memcpy(eui, dev->dev_addr + 12, 8); 2260 eui[0] |= 2; 2261 return 0; 2262 } 2263 2264 static int __ipv6_isatap_ifid(u8 *eui, __be32 addr) 2265 { 2266 if (addr == 0) 2267 return -1; 2268 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) || 2269 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) || 2270 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) || 2271 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) || 2272 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) || 2273 ipv4_is_lbcast(addr)) ? 0x00 : 0x02; 2274 eui[1] = 0; 2275 eui[2] = 0x5E; 2276 eui[3] = 0xFE; 2277 memcpy(eui + 4, &addr, 4); 2278 return 0; 2279 } 2280 2281 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev) 2282 { 2283 if (dev->priv_flags & IFF_ISATAP) 2284 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr); 2285 return -1; 2286 } 2287 2288 static int addrconf_ifid_gre(u8 *eui, struct net_device *dev) 2289 { 2290 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr); 2291 } 2292 2293 static int addrconf_ifid_ip6tnl(u8 *eui, struct net_device *dev) 2294 { 2295 memcpy(eui, dev->perm_addr, 3); 2296 memcpy(eui + 5, dev->perm_addr + 3, 3); 2297 eui[3] = 0xFF; 2298 eui[4] = 0xFE; 2299 eui[0] ^= 2; 2300 return 0; 2301 } 2302 2303 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev) 2304 { 2305 switch (dev->type) { 2306 case ARPHRD_ETHER: 2307 case ARPHRD_FDDI: 2308 return addrconf_ifid_eui48(eui, dev); 2309 case ARPHRD_ARCNET: 2310 return addrconf_ifid_arcnet(eui, dev); 2311 case ARPHRD_INFINIBAND: 2312 return addrconf_ifid_infiniband(eui, dev); 2313 case ARPHRD_SIT: 2314 return addrconf_ifid_sit(eui, dev); 2315 case ARPHRD_IPGRE: 2316 case ARPHRD_TUNNEL: 2317 return addrconf_ifid_gre(eui, dev); 2318 case ARPHRD_6LOWPAN: 2319 return addrconf_ifid_6lowpan(eui, dev); 2320 case ARPHRD_IEEE1394: 2321 return addrconf_ifid_ieee1394(eui, dev); 2322 case ARPHRD_TUNNEL6: 2323 case ARPHRD_IP6GRE: 2324 case ARPHRD_RAWIP: 2325 return addrconf_ifid_ip6tnl(eui, dev); 2326 } 2327 return -1; 2328 } 2329 2330 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev) 2331 { 2332 int err = -1; 2333 struct inet6_ifaddr *ifp; 2334 2335 read_lock_bh(&idev->lock); 2336 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) { 2337 if (ifp->scope > IFA_LINK) 2338 break; 2339 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) { 2340 memcpy(eui, ifp->addr.s6_addr+8, 8); 2341 err = 0; 2342 break; 2343 } 2344 } 2345 read_unlock_bh(&idev->lock); 2346 return err; 2347 } 2348 2349 /* Generation of a randomized Interface Identifier 2350 * draft-ietf-6man-rfc4941bis, Section 3.3.1 2351 */ 2352 2353 static void ipv6_gen_rnd_iid(struct in6_addr *addr) 2354 { 2355 regen: 2356 get_random_bytes(&addr->s6_addr[8], 8); 2357 2358 /* <draft-ietf-6man-rfc4941bis-08.txt>, Section 3.3.1: 2359 * check if generated address is not inappropriate: 2360 * 2361 * - Reserved IPv6 Interface Identifiers 2362 * - XXX: already assigned to an address on the device 2363 */ 2364 2365 /* Subnet-router anycast: 0000:0000:0000:0000 */ 2366 if (!(addr->s6_addr32[2] | addr->s6_addr32[3])) 2367 goto regen; 2368 2369 /* IANA Ethernet block: 0200:5EFF:FE00:0000-0200:5EFF:FE00:5212 2370 * Proxy Mobile IPv6: 0200:5EFF:FE00:5213 2371 * IANA Ethernet block: 0200:5EFF:FE00:5214-0200:5EFF:FEFF:FFFF 2372 */ 2373 if (ntohl(addr->s6_addr32[2]) == 0x02005eff && 2374 (ntohl(addr->s6_addr32[3]) & 0Xff000000) == 0xfe000000) 2375 goto regen; 2376 2377 /* Reserved subnet anycast addresses */ 2378 if (ntohl(addr->s6_addr32[2]) == 0xfdffffff && 2379 ntohl(addr->s6_addr32[3]) >= 0Xffffff80) 2380 goto regen; 2381 } 2382 2383 /* 2384 * Add prefix route. 2385 */ 2386 2387 static void 2388 addrconf_prefix_route(struct in6_addr *pfx, int plen, u32 metric, 2389 struct net_device *dev, unsigned long expires, 2390 u32 flags, gfp_t gfp_flags) 2391 { 2392 struct fib6_config cfg = { 2393 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX, 2394 .fc_metric = metric ? : IP6_RT_PRIO_ADDRCONF, 2395 .fc_ifindex = dev->ifindex, 2396 .fc_expires = expires, 2397 .fc_dst_len = plen, 2398 .fc_flags = RTF_UP | flags, 2399 .fc_nlinfo.nl_net = dev_net(dev), 2400 .fc_protocol = RTPROT_KERNEL, 2401 .fc_type = RTN_UNICAST, 2402 }; 2403 2404 cfg.fc_dst = *pfx; 2405 2406 /* Prevent useless cloning on PtP SIT. 2407 This thing is done here expecting that the whole 2408 class of non-broadcast devices need not cloning. 2409 */ 2410 #if IS_ENABLED(CONFIG_IPV6_SIT) 2411 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT)) 2412 cfg.fc_flags |= RTF_NONEXTHOP; 2413 #endif 2414 2415 ip6_route_add(&cfg, gfp_flags, NULL); 2416 } 2417 2418 2419 static struct fib6_info *addrconf_get_prefix_route(const struct in6_addr *pfx, 2420 int plen, 2421 const struct net_device *dev, 2422 u32 flags, u32 noflags, 2423 bool no_gw) 2424 { 2425 struct fib6_node *fn; 2426 struct fib6_info *rt = NULL; 2427 struct fib6_table *table; 2428 u32 tb_id = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX; 2429 2430 table = fib6_get_table(dev_net(dev), tb_id); 2431 if (!table) 2432 return NULL; 2433 2434 rcu_read_lock(); 2435 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0, true); 2436 if (!fn) 2437 goto out; 2438 2439 for_each_fib6_node_rt_rcu(fn) { 2440 /* prefix routes only use builtin fib6_nh */ 2441 if (rt->nh) 2442 continue; 2443 2444 if (rt->fib6_nh->fib_nh_dev->ifindex != dev->ifindex) 2445 continue; 2446 if (no_gw && rt->fib6_nh->fib_nh_gw_family) 2447 continue; 2448 if ((rt->fib6_flags & flags) != flags) 2449 continue; 2450 if ((rt->fib6_flags & noflags) != 0) 2451 continue; 2452 if (!fib6_info_hold_safe(rt)) 2453 continue; 2454 break; 2455 } 2456 out: 2457 rcu_read_unlock(); 2458 return rt; 2459 } 2460 2461 2462 /* Create "default" multicast route to the interface */ 2463 2464 static void addrconf_add_mroute(struct net_device *dev) 2465 { 2466 struct fib6_config cfg = { 2467 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_LOCAL, 2468 .fc_metric = IP6_RT_PRIO_ADDRCONF, 2469 .fc_ifindex = dev->ifindex, 2470 .fc_dst_len = 8, 2471 .fc_flags = RTF_UP, 2472 .fc_type = RTN_MULTICAST, 2473 .fc_nlinfo.nl_net = dev_net(dev), 2474 .fc_protocol = RTPROT_KERNEL, 2475 }; 2476 2477 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0); 2478 2479 ip6_route_add(&cfg, GFP_KERNEL, NULL); 2480 } 2481 2482 static struct inet6_dev *addrconf_add_dev(struct net_device *dev) 2483 { 2484 struct inet6_dev *idev; 2485 2486 ASSERT_RTNL(); 2487 2488 idev = ipv6_find_idev(dev); 2489 if (IS_ERR(idev)) 2490 return idev; 2491 2492 if (idev->cnf.disable_ipv6) 2493 return ERR_PTR(-EACCES); 2494 2495 /* Add default multicast route */ 2496 if (!(dev->flags & IFF_LOOPBACK) && !netif_is_l3_master(dev)) 2497 addrconf_add_mroute(dev); 2498 2499 return idev; 2500 } 2501 2502 static void manage_tempaddrs(struct inet6_dev *idev, 2503 struct inet6_ifaddr *ifp, 2504 __u32 valid_lft, __u32 prefered_lft, 2505 bool create, unsigned long now) 2506 { 2507 u32 flags; 2508 struct inet6_ifaddr *ift; 2509 2510 read_lock_bh(&idev->lock); 2511 /* update all temporary addresses in the list */ 2512 list_for_each_entry(ift, &idev->tempaddr_list, tmp_list) { 2513 int age, max_valid, max_prefered; 2514 2515 if (ifp != ift->ifpub) 2516 continue; 2517 2518 /* RFC 4941 section 3.3: 2519 * If a received option will extend the lifetime of a public 2520 * address, the lifetimes of temporary addresses should 2521 * be extended, subject to the overall constraint that no 2522 * temporary addresses should ever remain "valid" or "preferred" 2523 * for a time longer than (TEMP_VALID_LIFETIME) or 2524 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), respectively. 2525 */ 2526 age = (now - ift->cstamp) / HZ; 2527 max_valid = idev->cnf.temp_valid_lft - age; 2528 if (max_valid < 0) 2529 max_valid = 0; 2530 2531 max_prefered = idev->cnf.temp_prefered_lft - 2532 idev->desync_factor - age; 2533 if (max_prefered < 0) 2534 max_prefered = 0; 2535 2536 if (valid_lft > max_valid) 2537 valid_lft = max_valid; 2538 2539 if (prefered_lft > max_prefered) 2540 prefered_lft = max_prefered; 2541 2542 spin_lock(&ift->lock); 2543 flags = ift->flags; 2544 ift->valid_lft = valid_lft; 2545 ift->prefered_lft = prefered_lft; 2546 ift->tstamp = now; 2547 if (prefered_lft > 0) 2548 ift->flags &= ~IFA_F_DEPRECATED; 2549 2550 spin_unlock(&ift->lock); 2551 if (!(flags&IFA_F_TENTATIVE)) 2552 ipv6_ifa_notify(0, ift); 2553 } 2554 2555 if ((create || list_empty(&idev->tempaddr_list)) && 2556 idev->cnf.use_tempaddr > 0) { 2557 /* When a new public address is created as described 2558 * in [ADDRCONF], also create a new temporary address. 2559 * Also create a temporary address if it's enabled but 2560 * no temporary address currently exists. 2561 */ 2562 read_unlock_bh(&idev->lock); 2563 ipv6_create_tempaddr(ifp, false); 2564 } else { 2565 read_unlock_bh(&idev->lock); 2566 } 2567 } 2568 2569 static bool is_addr_mode_generate_stable(struct inet6_dev *idev) 2570 { 2571 return idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY || 2572 idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_RANDOM; 2573 } 2574 2575 int addrconf_prefix_rcv_add_addr(struct net *net, struct net_device *dev, 2576 const struct prefix_info *pinfo, 2577 struct inet6_dev *in6_dev, 2578 const struct in6_addr *addr, int addr_type, 2579 u32 addr_flags, bool sllao, bool tokenized, 2580 __u32 valid_lft, u32 prefered_lft) 2581 { 2582 struct inet6_ifaddr *ifp = ipv6_get_ifaddr(net, addr, dev, 1); 2583 int create = 0; 2584 2585 if (!ifp && valid_lft) { 2586 int max_addresses = in6_dev->cnf.max_addresses; 2587 struct ifa6_config cfg = { 2588 .pfx = addr, 2589 .plen = pinfo->prefix_len, 2590 .ifa_flags = addr_flags, 2591 .valid_lft = valid_lft, 2592 .preferred_lft = prefered_lft, 2593 .scope = addr_type & IPV6_ADDR_SCOPE_MASK, 2594 }; 2595 2596 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 2597 if ((net->ipv6.devconf_all->optimistic_dad || 2598 in6_dev->cnf.optimistic_dad) && 2599 !net->ipv6.devconf_all->forwarding && sllao) 2600 cfg.ifa_flags |= IFA_F_OPTIMISTIC; 2601 #endif 2602 2603 /* Do not allow to create too much of autoconfigured 2604 * addresses; this would be too easy way to crash kernel. 2605 */ 2606 if (!max_addresses || 2607 ipv6_count_addresses(in6_dev) < max_addresses) 2608 ifp = ipv6_add_addr(in6_dev, &cfg, false, NULL); 2609 2610 if (IS_ERR_OR_NULL(ifp)) 2611 return -1; 2612 2613 create = 1; 2614 spin_lock_bh(&ifp->lock); 2615 ifp->flags |= IFA_F_MANAGETEMPADDR; 2616 ifp->cstamp = jiffies; 2617 ifp->tokenized = tokenized; 2618 spin_unlock_bh(&ifp->lock); 2619 addrconf_dad_start(ifp); 2620 } 2621 2622 if (ifp) { 2623 u32 flags; 2624 unsigned long now; 2625 u32 stored_lft; 2626 2627 /* Update lifetime (RFC4862 5.5.3 e) 2628 * We deviate from RFC4862 by honoring all Valid Lifetimes to 2629 * improve the reaction of SLAAC to renumbering events 2630 * (draft-gont-6man-slaac-renum-06, Section 4.2) 2631 */ 2632 spin_lock_bh(&ifp->lock); 2633 now = jiffies; 2634 if (ifp->valid_lft > (now - ifp->tstamp) / HZ) 2635 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ; 2636 else 2637 stored_lft = 0; 2638 2639 if (!create && stored_lft) { 2640 ifp->valid_lft = valid_lft; 2641 ifp->prefered_lft = prefered_lft; 2642 ifp->tstamp = now; 2643 flags = ifp->flags; 2644 ifp->flags &= ~IFA_F_DEPRECATED; 2645 spin_unlock_bh(&ifp->lock); 2646 2647 if (!(flags&IFA_F_TENTATIVE)) 2648 ipv6_ifa_notify(0, ifp); 2649 } else 2650 spin_unlock_bh(&ifp->lock); 2651 2652 manage_tempaddrs(in6_dev, ifp, valid_lft, prefered_lft, 2653 create, now); 2654 2655 in6_ifa_put(ifp); 2656 addrconf_verify(); 2657 } 2658 2659 return 0; 2660 } 2661 EXPORT_SYMBOL_GPL(addrconf_prefix_rcv_add_addr); 2662 2663 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao) 2664 { 2665 struct prefix_info *pinfo; 2666 __u32 valid_lft; 2667 __u32 prefered_lft; 2668 int addr_type, err; 2669 u32 addr_flags = 0; 2670 struct inet6_dev *in6_dev; 2671 struct net *net = dev_net(dev); 2672 2673 pinfo = (struct prefix_info *) opt; 2674 2675 if (len < sizeof(struct prefix_info)) { 2676 netdev_dbg(dev, "addrconf: prefix option too short\n"); 2677 return; 2678 } 2679 2680 /* 2681 * Validation checks ([ADDRCONF], page 19) 2682 */ 2683 2684 addr_type = ipv6_addr_type(&pinfo->prefix); 2685 2686 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL)) 2687 return; 2688 2689 valid_lft = ntohl(pinfo->valid); 2690 prefered_lft = ntohl(pinfo->prefered); 2691 2692 if (prefered_lft > valid_lft) { 2693 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n"); 2694 return; 2695 } 2696 2697 in6_dev = in6_dev_get(dev); 2698 2699 if (!in6_dev) { 2700 net_dbg_ratelimited("addrconf: device %s not configured\n", 2701 dev->name); 2702 return; 2703 } 2704 2705 /* 2706 * Two things going on here: 2707 * 1) Add routes for on-link prefixes 2708 * 2) Configure prefixes with the auto flag set 2709 */ 2710 2711 if (pinfo->onlink) { 2712 struct fib6_info *rt; 2713 unsigned long rt_expires; 2714 2715 /* Avoid arithmetic overflow. Really, we could 2716 * save rt_expires in seconds, likely valid_lft, 2717 * but it would require division in fib gc, that it 2718 * not good. 2719 */ 2720 if (HZ > USER_HZ) 2721 rt_expires = addrconf_timeout_fixup(valid_lft, HZ); 2722 else 2723 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ); 2724 2725 if (addrconf_finite_timeout(rt_expires)) 2726 rt_expires *= HZ; 2727 2728 rt = addrconf_get_prefix_route(&pinfo->prefix, 2729 pinfo->prefix_len, 2730 dev, 2731 RTF_ADDRCONF | RTF_PREFIX_RT, 2732 RTF_DEFAULT, true); 2733 2734 if (rt) { 2735 /* Autoconf prefix route */ 2736 if (valid_lft == 0) { 2737 ip6_del_rt(net, rt, false); 2738 rt = NULL; 2739 } else if (addrconf_finite_timeout(rt_expires)) { 2740 /* not infinity */ 2741 fib6_set_expires(rt, jiffies + rt_expires); 2742 } else { 2743 fib6_clean_expires(rt); 2744 } 2745 } else if (valid_lft) { 2746 clock_t expires = 0; 2747 int flags = RTF_ADDRCONF | RTF_PREFIX_RT; 2748 if (addrconf_finite_timeout(rt_expires)) { 2749 /* not infinity */ 2750 flags |= RTF_EXPIRES; 2751 expires = jiffies_to_clock_t(rt_expires); 2752 } 2753 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len, 2754 0, dev, expires, flags, 2755 GFP_ATOMIC); 2756 } 2757 fib6_info_release(rt); 2758 } 2759 2760 /* Try to figure out our local address for this prefix */ 2761 2762 if (pinfo->autoconf && in6_dev->cnf.autoconf) { 2763 struct in6_addr addr; 2764 bool tokenized = false, dev_addr_generated = false; 2765 2766 if (pinfo->prefix_len == 64) { 2767 memcpy(&addr, &pinfo->prefix, 8); 2768 2769 if (!ipv6_addr_any(&in6_dev->token)) { 2770 read_lock_bh(&in6_dev->lock); 2771 memcpy(addr.s6_addr + 8, 2772 in6_dev->token.s6_addr + 8, 8); 2773 read_unlock_bh(&in6_dev->lock); 2774 tokenized = true; 2775 } else if (is_addr_mode_generate_stable(in6_dev) && 2776 !ipv6_generate_stable_address(&addr, 0, 2777 in6_dev)) { 2778 addr_flags |= IFA_F_STABLE_PRIVACY; 2779 goto ok; 2780 } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) && 2781 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) { 2782 goto put; 2783 } else { 2784 dev_addr_generated = true; 2785 } 2786 goto ok; 2787 } 2788 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n", 2789 pinfo->prefix_len); 2790 goto put; 2791 2792 ok: 2793 err = addrconf_prefix_rcv_add_addr(net, dev, pinfo, in6_dev, 2794 &addr, addr_type, 2795 addr_flags, sllao, 2796 tokenized, valid_lft, 2797 prefered_lft); 2798 if (err) 2799 goto put; 2800 2801 /* Ignore error case here because previous prefix add addr was 2802 * successful which will be notified. 2803 */ 2804 ndisc_ops_prefix_rcv_add_addr(net, dev, pinfo, in6_dev, &addr, 2805 addr_type, addr_flags, sllao, 2806 tokenized, valid_lft, 2807 prefered_lft, 2808 dev_addr_generated); 2809 } 2810 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo); 2811 put: 2812 in6_dev_put(in6_dev); 2813 } 2814 2815 static int addrconf_set_sit_dstaddr(struct net *net, struct net_device *dev, 2816 struct in6_ifreq *ireq) 2817 { 2818 struct ip_tunnel_parm p = { }; 2819 int err; 2820 2821 if (!(ipv6_addr_type(&ireq->ifr6_addr) & IPV6_ADDR_COMPATv4)) 2822 return -EADDRNOTAVAIL; 2823 2824 p.iph.daddr = ireq->ifr6_addr.s6_addr32[3]; 2825 p.iph.version = 4; 2826 p.iph.ihl = 5; 2827 p.iph.protocol = IPPROTO_IPV6; 2828 p.iph.ttl = 64; 2829 2830 if (!dev->netdev_ops->ndo_tunnel_ctl) 2831 return -EOPNOTSUPP; 2832 err = dev->netdev_ops->ndo_tunnel_ctl(dev, &p, SIOCADDTUNNEL); 2833 if (err) 2834 return err; 2835 2836 dev = __dev_get_by_name(net, p.name); 2837 if (!dev) 2838 return -ENOBUFS; 2839 return dev_open(dev, NULL); 2840 } 2841 2842 /* 2843 * Set destination address. 2844 * Special case for SIT interfaces where we create a new "virtual" 2845 * device. 2846 */ 2847 int addrconf_set_dstaddr(struct net *net, void __user *arg) 2848 { 2849 struct net_device *dev; 2850 struct in6_ifreq ireq; 2851 int err = -ENODEV; 2852 2853 if (!IS_ENABLED(CONFIG_IPV6_SIT)) 2854 return -ENODEV; 2855 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2856 return -EFAULT; 2857 2858 rtnl_lock(); 2859 dev = __dev_get_by_index(net, ireq.ifr6_ifindex); 2860 if (dev && dev->type == ARPHRD_SIT) 2861 err = addrconf_set_sit_dstaddr(net, dev, &ireq); 2862 rtnl_unlock(); 2863 return err; 2864 } 2865 2866 static int ipv6_mc_config(struct sock *sk, bool join, 2867 const struct in6_addr *addr, int ifindex) 2868 { 2869 int ret; 2870 2871 ASSERT_RTNL(); 2872 2873 lock_sock(sk); 2874 if (join) 2875 ret = ipv6_sock_mc_join(sk, ifindex, addr); 2876 else 2877 ret = ipv6_sock_mc_drop(sk, ifindex, addr); 2878 release_sock(sk); 2879 2880 return ret; 2881 } 2882 2883 /* 2884 * Manual configuration of address on an interface 2885 */ 2886 static int inet6_addr_add(struct net *net, int ifindex, 2887 struct ifa6_config *cfg, 2888 struct netlink_ext_ack *extack) 2889 { 2890 struct inet6_ifaddr *ifp; 2891 struct inet6_dev *idev; 2892 struct net_device *dev; 2893 unsigned long timeout; 2894 clock_t expires; 2895 u32 flags; 2896 2897 ASSERT_RTNL(); 2898 2899 if (cfg->plen > 128) 2900 return -EINVAL; 2901 2902 /* check the lifetime */ 2903 if (!cfg->valid_lft || cfg->preferred_lft > cfg->valid_lft) 2904 return -EINVAL; 2905 2906 if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR && cfg->plen != 64) 2907 return -EINVAL; 2908 2909 dev = __dev_get_by_index(net, ifindex); 2910 if (!dev) 2911 return -ENODEV; 2912 2913 idev = addrconf_add_dev(dev); 2914 if (IS_ERR(idev)) 2915 return PTR_ERR(idev); 2916 2917 if (cfg->ifa_flags & IFA_F_MCAUTOJOIN) { 2918 int ret = ipv6_mc_config(net->ipv6.mc_autojoin_sk, 2919 true, cfg->pfx, ifindex); 2920 2921 if (ret < 0) 2922 return ret; 2923 } 2924 2925 cfg->scope = ipv6_addr_scope(cfg->pfx); 2926 2927 timeout = addrconf_timeout_fixup(cfg->valid_lft, HZ); 2928 if (addrconf_finite_timeout(timeout)) { 2929 expires = jiffies_to_clock_t(timeout * HZ); 2930 cfg->valid_lft = timeout; 2931 flags = RTF_EXPIRES; 2932 } else { 2933 expires = 0; 2934 flags = 0; 2935 cfg->ifa_flags |= IFA_F_PERMANENT; 2936 } 2937 2938 timeout = addrconf_timeout_fixup(cfg->preferred_lft, HZ); 2939 if (addrconf_finite_timeout(timeout)) { 2940 if (timeout == 0) 2941 cfg->ifa_flags |= IFA_F_DEPRECATED; 2942 cfg->preferred_lft = timeout; 2943 } 2944 2945 ifp = ipv6_add_addr(idev, cfg, true, extack); 2946 if (!IS_ERR(ifp)) { 2947 if (!(cfg->ifa_flags & IFA_F_NOPREFIXROUTE)) { 2948 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, 2949 ifp->rt_priority, dev, expires, 2950 flags, GFP_KERNEL); 2951 } 2952 2953 /* Send a netlink notification if DAD is enabled and 2954 * optimistic flag is not set 2955 */ 2956 if (!(ifp->flags & (IFA_F_OPTIMISTIC | IFA_F_NODAD))) 2957 ipv6_ifa_notify(0, ifp); 2958 /* 2959 * Note that section 3.1 of RFC 4429 indicates 2960 * that the Optimistic flag should not be set for 2961 * manually configured addresses 2962 */ 2963 addrconf_dad_start(ifp); 2964 if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR) 2965 manage_tempaddrs(idev, ifp, cfg->valid_lft, 2966 cfg->preferred_lft, true, jiffies); 2967 in6_ifa_put(ifp); 2968 addrconf_verify_rtnl(); 2969 return 0; 2970 } else if (cfg->ifa_flags & IFA_F_MCAUTOJOIN) { 2971 ipv6_mc_config(net->ipv6.mc_autojoin_sk, false, 2972 cfg->pfx, ifindex); 2973 } 2974 2975 return PTR_ERR(ifp); 2976 } 2977 2978 static int inet6_addr_del(struct net *net, int ifindex, u32 ifa_flags, 2979 const struct in6_addr *pfx, unsigned int plen) 2980 { 2981 struct inet6_ifaddr *ifp; 2982 struct inet6_dev *idev; 2983 struct net_device *dev; 2984 2985 if (plen > 128) 2986 return -EINVAL; 2987 2988 dev = __dev_get_by_index(net, ifindex); 2989 if (!dev) 2990 return -ENODEV; 2991 2992 idev = __in6_dev_get(dev); 2993 if (!idev) 2994 return -ENXIO; 2995 2996 read_lock_bh(&idev->lock); 2997 list_for_each_entry(ifp, &idev->addr_list, if_list) { 2998 if (ifp->prefix_len == plen && 2999 ipv6_addr_equal(pfx, &ifp->addr)) { 3000 in6_ifa_hold(ifp); 3001 read_unlock_bh(&idev->lock); 3002 3003 if (!(ifp->flags & IFA_F_TEMPORARY) && 3004 (ifa_flags & IFA_F_MANAGETEMPADDR)) 3005 manage_tempaddrs(idev, ifp, 0, 0, false, 3006 jiffies); 3007 ipv6_del_addr(ifp); 3008 addrconf_verify_rtnl(); 3009 if (ipv6_addr_is_multicast(pfx)) { 3010 ipv6_mc_config(net->ipv6.mc_autojoin_sk, 3011 false, pfx, dev->ifindex); 3012 } 3013 return 0; 3014 } 3015 } 3016 read_unlock_bh(&idev->lock); 3017 return -EADDRNOTAVAIL; 3018 } 3019 3020 3021 int addrconf_add_ifaddr(struct net *net, void __user *arg) 3022 { 3023 struct ifa6_config cfg = { 3024 .ifa_flags = IFA_F_PERMANENT, 3025 .preferred_lft = INFINITY_LIFE_TIME, 3026 .valid_lft = INFINITY_LIFE_TIME, 3027 }; 3028 struct in6_ifreq ireq; 3029 int err; 3030 3031 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 3032 return -EPERM; 3033 3034 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 3035 return -EFAULT; 3036 3037 cfg.pfx = &ireq.ifr6_addr; 3038 cfg.plen = ireq.ifr6_prefixlen; 3039 3040 rtnl_lock(); 3041 err = inet6_addr_add(net, ireq.ifr6_ifindex, &cfg, NULL); 3042 rtnl_unlock(); 3043 return err; 3044 } 3045 3046 int addrconf_del_ifaddr(struct net *net, void __user *arg) 3047 { 3048 struct in6_ifreq ireq; 3049 int err; 3050 3051 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 3052 return -EPERM; 3053 3054 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 3055 return -EFAULT; 3056 3057 rtnl_lock(); 3058 err = inet6_addr_del(net, ireq.ifr6_ifindex, 0, &ireq.ifr6_addr, 3059 ireq.ifr6_prefixlen); 3060 rtnl_unlock(); 3061 return err; 3062 } 3063 3064 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr, 3065 int plen, int scope) 3066 { 3067 struct inet6_ifaddr *ifp; 3068 struct ifa6_config cfg = { 3069 .pfx = addr, 3070 .plen = plen, 3071 .ifa_flags = IFA_F_PERMANENT, 3072 .valid_lft = INFINITY_LIFE_TIME, 3073 .preferred_lft = INFINITY_LIFE_TIME, 3074 .scope = scope 3075 }; 3076 3077 ifp = ipv6_add_addr(idev, &cfg, true, NULL); 3078 if (!IS_ERR(ifp)) { 3079 spin_lock_bh(&ifp->lock); 3080 ifp->flags &= ~IFA_F_TENTATIVE; 3081 spin_unlock_bh(&ifp->lock); 3082 rt_genid_bump_ipv6(dev_net(idev->dev)); 3083 ipv6_ifa_notify(RTM_NEWADDR, ifp); 3084 in6_ifa_put(ifp); 3085 } 3086 } 3087 3088 #if IS_ENABLED(CONFIG_IPV6_SIT) 3089 static void sit_add_v4_addrs(struct inet6_dev *idev) 3090 { 3091 struct in6_addr addr; 3092 struct net_device *dev; 3093 struct net *net = dev_net(idev->dev); 3094 int scope, plen; 3095 u32 pflags = 0; 3096 3097 ASSERT_RTNL(); 3098 3099 memset(&addr, 0, sizeof(struct in6_addr)); 3100 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4); 3101 3102 if (idev->dev->flags&IFF_POINTOPOINT) { 3103 addr.s6_addr32[0] = htonl(0xfe800000); 3104 scope = IFA_LINK; 3105 plen = 64; 3106 } else { 3107 scope = IPV6_ADDR_COMPATv4; 3108 plen = 96; 3109 pflags |= RTF_NONEXTHOP; 3110 } 3111 3112 if (addr.s6_addr32[3]) { 3113 add_addr(idev, &addr, plen, scope); 3114 addrconf_prefix_route(&addr, plen, 0, idev->dev, 0, pflags, 3115 GFP_KERNEL); 3116 return; 3117 } 3118 3119 for_each_netdev(net, dev) { 3120 struct in_device *in_dev = __in_dev_get_rtnl(dev); 3121 if (in_dev && (dev->flags & IFF_UP)) { 3122 struct in_ifaddr *ifa; 3123 int flag = scope; 3124 3125 in_dev_for_each_ifa_rtnl(ifa, in_dev) { 3126 addr.s6_addr32[3] = ifa->ifa_local; 3127 3128 if (ifa->ifa_scope == RT_SCOPE_LINK) 3129 continue; 3130 if (ifa->ifa_scope >= RT_SCOPE_HOST) { 3131 if (idev->dev->flags&IFF_POINTOPOINT) 3132 continue; 3133 flag |= IFA_HOST; 3134 } 3135 3136 add_addr(idev, &addr, plen, flag); 3137 addrconf_prefix_route(&addr, plen, 0, idev->dev, 3138 0, pflags, GFP_KERNEL); 3139 } 3140 } 3141 } 3142 } 3143 #endif 3144 3145 static void init_loopback(struct net_device *dev) 3146 { 3147 struct inet6_dev *idev; 3148 3149 /* ::1 */ 3150 3151 ASSERT_RTNL(); 3152 3153 idev = ipv6_find_idev(dev); 3154 if (IS_ERR(idev)) { 3155 pr_debug("%s: add_dev failed\n", __func__); 3156 return; 3157 } 3158 3159 add_addr(idev, &in6addr_loopback, 128, IFA_HOST); 3160 } 3161 3162 void addrconf_add_linklocal(struct inet6_dev *idev, 3163 const struct in6_addr *addr, u32 flags) 3164 { 3165 struct ifa6_config cfg = { 3166 .pfx = addr, 3167 .plen = 64, 3168 .ifa_flags = flags | IFA_F_PERMANENT, 3169 .valid_lft = INFINITY_LIFE_TIME, 3170 .preferred_lft = INFINITY_LIFE_TIME, 3171 .scope = IFA_LINK 3172 }; 3173 struct inet6_ifaddr *ifp; 3174 3175 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 3176 if ((dev_net(idev->dev)->ipv6.devconf_all->optimistic_dad || 3177 idev->cnf.optimistic_dad) && 3178 !dev_net(idev->dev)->ipv6.devconf_all->forwarding) 3179 cfg.ifa_flags |= IFA_F_OPTIMISTIC; 3180 #endif 3181 3182 ifp = ipv6_add_addr(idev, &cfg, true, NULL); 3183 if (!IS_ERR(ifp)) { 3184 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, 0, idev->dev, 3185 0, 0, GFP_ATOMIC); 3186 addrconf_dad_start(ifp); 3187 in6_ifa_put(ifp); 3188 } 3189 } 3190 EXPORT_SYMBOL_GPL(addrconf_add_linklocal); 3191 3192 static bool ipv6_reserved_interfaceid(struct in6_addr address) 3193 { 3194 if ((address.s6_addr32[2] | address.s6_addr32[3]) == 0) 3195 return true; 3196 3197 if (address.s6_addr32[2] == htonl(0x02005eff) && 3198 ((address.s6_addr32[3] & htonl(0xfe000000)) == htonl(0xfe000000))) 3199 return true; 3200 3201 if (address.s6_addr32[2] == htonl(0xfdffffff) && 3202 ((address.s6_addr32[3] & htonl(0xffffff80)) == htonl(0xffffff80))) 3203 return true; 3204 3205 return false; 3206 } 3207 3208 static int ipv6_generate_stable_address(struct in6_addr *address, 3209 u8 dad_count, 3210 const struct inet6_dev *idev) 3211 { 3212 static DEFINE_SPINLOCK(lock); 3213 static __u32 digest[SHA1_DIGEST_WORDS]; 3214 static __u32 workspace[SHA1_WORKSPACE_WORDS]; 3215 3216 static union { 3217 char __data[SHA1_BLOCK_SIZE]; 3218 struct { 3219 struct in6_addr secret; 3220 __be32 prefix[2]; 3221 unsigned char hwaddr[MAX_ADDR_LEN]; 3222 u8 dad_count; 3223 } __packed; 3224 } data; 3225 3226 struct in6_addr secret; 3227 struct in6_addr temp; 3228 struct net *net = dev_net(idev->dev); 3229 3230 BUILD_BUG_ON(sizeof(data.__data) != sizeof(data)); 3231 3232 if (idev->cnf.stable_secret.initialized) 3233 secret = idev->cnf.stable_secret.secret; 3234 else if (net->ipv6.devconf_dflt->stable_secret.initialized) 3235 secret = net->ipv6.devconf_dflt->stable_secret.secret; 3236 else 3237 return -1; 3238 3239 retry: 3240 spin_lock_bh(&lock); 3241 3242 sha1_init(digest); 3243 memset(&data, 0, sizeof(data)); 3244 memset(workspace, 0, sizeof(workspace)); 3245 memcpy(data.hwaddr, idev->dev->perm_addr, idev->dev->addr_len); 3246 data.prefix[0] = address->s6_addr32[0]; 3247 data.prefix[1] = address->s6_addr32[1]; 3248 data.secret = secret; 3249 data.dad_count = dad_count; 3250 3251 sha1_transform(digest, data.__data, workspace); 3252 3253 temp = *address; 3254 temp.s6_addr32[2] = (__force __be32)digest[0]; 3255 temp.s6_addr32[3] = (__force __be32)digest[1]; 3256 3257 spin_unlock_bh(&lock); 3258 3259 if (ipv6_reserved_interfaceid(temp)) { 3260 dad_count++; 3261 if (dad_count > dev_net(idev->dev)->ipv6.sysctl.idgen_retries) 3262 return -1; 3263 goto retry; 3264 } 3265 3266 *address = temp; 3267 return 0; 3268 } 3269 3270 static void ipv6_gen_mode_random_init(struct inet6_dev *idev) 3271 { 3272 struct ipv6_stable_secret *s = &idev->cnf.stable_secret; 3273 3274 if (s->initialized) 3275 return; 3276 s = &idev->cnf.stable_secret; 3277 get_random_bytes(&s->secret, sizeof(s->secret)); 3278 s->initialized = true; 3279 } 3280 3281 static void addrconf_addr_gen(struct inet6_dev *idev, bool prefix_route) 3282 { 3283 struct in6_addr addr; 3284 3285 /* no link local addresses on L3 master devices */ 3286 if (netif_is_l3_master(idev->dev)) 3287 return; 3288 3289 /* no link local addresses on devices flagged as slaves */ 3290 if (idev->dev->flags & IFF_SLAVE) 3291 return; 3292 3293 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0); 3294 3295 switch (idev->cnf.addr_gen_mode) { 3296 case IN6_ADDR_GEN_MODE_RANDOM: 3297 ipv6_gen_mode_random_init(idev); 3298 fallthrough; 3299 case IN6_ADDR_GEN_MODE_STABLE_PRIVACY: 3300 if (!ipv6_generate_stable_address(&addr, 0, idev)) 3301 addrconf_add_linklocal(idev, &addr, 3302 IFA_F_STABLE_PRIVACY); 3303 else if (prefix_route) 3304 addrconf_prefix_route(&addr, 64, 0, idev->dev, 3305 0, 0, GFP_KERNEL); 3306 break; 3307 case IN6_ADDR_GEN_MODE_EUI64: 3308 /* addrconf_add_linklocal also adds a prefix_route and we 3309 * only need to care about prefix routes if ipv6_generate_eui64 3310 * couldn't generate one. 3311 */ 3312 if (ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) == 0) 3313 addrconf_add_linklocal(idev, &addr, 0); 3314 else if (prefix_route) 3315 addrconf_prefix_route(&addr, 64, 0, idev->dev, 3316 0, 0, GFP_KERNEL); 3317 break; 3318 case IN6_ADDR_GEN_MODE_NONE: 3319 default: 3320 /* will not add any link local address */ 3321 break; 3322 } 3323 } 3324 3325 static void addrconf_dev_config(struct net_device *dev) 3326 { 3327 struct inet6_dev *idev; 3328 3329 ASSERT_RTNL(); 3330 3331 if ((dev->type != ARPHRD_ETHER) && 3332 (dev->type != ARPHRD_FDDI) && 3333 (dev->type != ARPHRD_ARCNET) && 3334 (dev->type != ARPHRD_INFINIBAND) && 3335 (dev->type != ARPHRD_IEEE1394) && 3336 (dev->type != ARPHRD_TUNNEL6) && 3337 (dev->type != ARPHRD_6LOWPAN) && 3338 (dev->type != ARPHRD_IP6GRE) && 3339 (dev->type != ARPHRD_IPGRE) && 3340 (dev->type != ARPHRD_TUNNEL) && 3341 (dev->type != ARPHRD_NONE) && 3342 (dev->type != ARPHRD_RAWIP)) { 3343 /* Alas, we support only Ethernet autoconfiguration. */ 3344 idev = __in6_dev_get(dev); 3345 if (!IS_ERR_OR_NULL(idev) && dev->flags & IFF_UP && 3346 dev->flags & IFF_MULTICAST) 3347 ipv6_mc_up(idev); 3348 return; 3349 } 3350 3351 idev = addrconf_add_dev(dev); 3352 if (IS_ERR(idev)) 3353 return; 3354 3355 /* this device type has no EUI support */ 3356 if (dev->type == ARPHRD_NONE && 3357 idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_EUI64) 3358 idev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_RANDOM; 3359 3360 addrconf_addr_gen(idev, false); 3361 } 3362 3363 #if IS_ENABLED(CONFIG_IPV6_SIT) 3364 static void addrconf_sit_config(struct net_device *dev) 3365 { 3366 struct inet6_dev *idev; 3367 3368 ASSERT_RTNL(); 3369 3370 /* 3371 * Configure the tunnel with one of our IPv4 3372 * addresses... we should configure all of 3373 * our v4 addrs in the tunnel 3374 */ 3375 3376 idev = ipv6_find_idev(dev); 3377 if (IS_ERR(idev)) { 3378 pr_debug("%s: add_dev failed\n", __func__); 3379 return; 3380 } 3381 3382 if (dev->priv_flags & IFF_ISATAP) { 3383 addrconf_addr_gen(idev, false); 3384 return; 3385 } 3386 3387 sit_add_v4_addrs(idev); 3388 3389 if (dev->flags&IFF_POINTOPOINT) 3390 addrconf_add_mroute(dev); 3391 } 3392 #endif 3393 3394 #if IS_ENABLED(CONFIG_NET_IPGRE) 3395 static void addrconf_gre_config(struct net_device *dev) 3396 { 3397 struct inet6_dev *idev; 3398 3399 ASSERT_RTNL(); 3400 3401 idev = ipv6_find_idev(dev); 3402 if (IS_ERR(idev)) { 3403 pr_debug("%s: add_dev failed\n", __func__); 3404 return; 3405 } 3406 3407 addrconf_addr_gen(idev, true); 3408 if (dev->flags & IFF_POINTOPOINT) 3409 addrconf_add_mroute(dev); 3410 } 3411 #endif 3412 3413 static int fixup_permanent_addr(struct net *net, 3414 struct inet6_dev *idev, 3415 struct inet6_ifaddr *ifp) 3416 { 3417 /* !fib6_node means the host route was removed from the 3418 * FIB, for example, if 'lo' device is taken down. In that 3419 * case regenerate the host route. 3420 */ 3421 if (!ifp->rt || !ifp->rt->fib6_node) { 3422 struct fib6_info *f6i, *prev; 3423 3424 f6i = addrconf_f6i_alloc(net, idev, &ifp->addr, false, 3425 GFP_ATOMIC); 3426 if (IS_ERR(f6i)) 3427 return PTR_ERR(f6i); 3428 3429 /* ifp->rt can be accessed outside of rtnl */ 3430 spin_lock(&ifp->lock); 3431 prev = ifp->rt; 3432 ifp->rt = f6i; 3433 spin_unlock(&ifp->lock); 3434 3435 fib6_info_release(prev); 3436 } 3437 3438 if (!(ifp->flags & IFA_F_NOPREFIXROUTE)) { 3439 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, 3440 ifp->rt_priority, idev->dev, 0, 0, 3441 GFP_ATOMIC); 3442 } 3443 3444 if (ifp->state == INET6_IFADDR_STATE_PREDAD) 3445 addrconf_dad_start(ifp); 3446 3447 return 0; 3448 } 3449 3450 static void addrconf_permanent_addr(struct net *net, struct net_device *dev) 3451 { 3452 struct inet6_ifaddr *ifp, *tmp; 3453 struct inet6_dev *idev; 3454 3455 idev = __in6_dev_get(dev); 3456 if (!idev) 3457 return; 3458 3459 write_lock_bh(&idev->lock); 3460 3461 list_for_each_entry_safe(ifp, tmp, &idev->addr_list, if_list) { 3462 if ((ifp->flags & IFA_F_PERMANENT) && 3463 fixup_permanent_addr(net, idev, ifp) < 0) { 3464 write_unlock_bh(&idev->lock); 3465 in6_ifa_hold(ifp); 3466 ipv6_del_addr(ifp); 3467 write_lock_bh(&idev->lock); 3468 3469 net_info_ratelimited("%s: Failed to add prefix route for address %pI6c; dropping\n", 3470 idev->dev->name, &ifp->addr); 3471 } 3472 } 3473 3474 write_unlock_bh(&idev->lock); 3475 } 3476 3477 static int addrconf_notify(struct notifier_block *this, unsigned long event, 3478 void *ptr) 3479 { 3480 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 3481 struct netdev_notifier_change_info *change_info; 3482 struct netdev_notifier_changeupper_info *info; 3483 struct inet6_dev *idev = __in6_dev_get(dev); 3484 struct net *net = dev_net(dev); 3485 int run_pending = 0; 3486 int err; 3487 3488 switch (event) { 3489 case NETDEV_REGISTER: 3490 if (!idev && dev->mtu >= IPV6_MIN_MTU) { 3491 idev = ipv6_add_dev(dev); 3492 if (IS_ERR(idev)) 3493 return notifier_from_errno(PTR_ERR(idev)); 3494 } 3495 break; 3496 3497 case NETDEV_CHANGEMTU: 3498 /* if MTU under IPV6_MIN_MTU stop IPv6 on this interface. */ 3499 if (dev->mtu < IPV6_MIN_MTU) { 3500 addrconf_ifdown(dev, dev != net->loopback_dev); 3501 break; 3502 } 3503 3504 if (idev) { 3505 rt6_mtu_change(dev, dev->mtu); 3506 idev->cnf.mtu6 = dev->mtu; 3507 break; 3508 } 3509 3510 /* allocate new idev */ 3511 idev = ipv6_add_dev(dev); 3512 if (IS_ERR(idev)) 3513 break; 3514 3515 /* device is still not ready */ 3516 if (!(idev->if_flags & IF_READY)) 3517 break; 3518 3519 run_pending = 1; 3520 fallthrough; 3521 case NETDEV_UP: 3522 case NETDEV_CHANGE: 3523 if (dev->flags & IFF_SLAVE) 3524 break; 3525 3526 if (idev && idev->cnf.disable_ipv6) 3527 break; 3528 3529 if (event == NETDEV_UP) { 3530 /* restore routes for permanent addresses */ 3531 addrconf_permanent_addr(net, dev); 3532 3533 if (!addrconf_link_ready(dev)) { 3534 /* device is not ready yet. */ 3535 pr_debug("ADDRCONF(NETDEV_UP): %s: link is not ready\n", 3536 dev->name); 3537 break; 3538 } 3539 3540 if (!idev && dev->mtu >= IPV6_MIN_MTU) 3541 idev = ipv6_add_dev(dev); 3542 3543 if (!IS_ERR_OR_NULL(idev)) { 3544 idev->if_flags |= IF_READY; 3545 run_pending = 1; 3546 } 3547 } else if (event == NETDEV_CHANGE) { 3548 if (!addrconf_link_ready(dev)) { 3549 /* device is still not ready. */ 3550 rt6_sync_down_dev(dev, event); 3551 break; 3552 } 3553 3554 if (!IS_ERR_OR_NULL(idev)) { 3555 if (idev->if_flags & IF_READY) { 3556 /* device is already configured - 3557 * but resend MLD reports, we might 3558 * have roamed and need to update 3559 * multicast snooping switches 3560 */ 3561 ipv6_mc_up(idev); 3562 change_info = ptr; 3563 if (change_info->flags_changed & IFF_NOARP) 3564 addrconf_dad_run(idev, true); 3565 rt6_sync_up(dev, RTNH_F_LINKDOWN); 3566 break; 3567 } 3568 idev->if_flags |= IF_READY; 3569 } 3570 3571 pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n", 3572 dev->name); 3573 3574 run_pending = 1; 3575 } 3576 3577 switch (dev->type) { 3578 #if IS_ENABLED(CONFIG_IPV6_SIT) 3579 case ARPHRD_SIT: 3580 addrconf_sit_config(dev); 3581 break; 3582 #endif 3583 #if IS_ENABLED(CONFIG_NET_IPGRE) 3584 case ARPHRD_IPGRE: 3585 addrconf_gre_config(dev); 3586 break; 3587 #endif 3588 case ARPHRD_LOOPBACK: 3589 init_loopback(dev); 3590 break; 3591 3592 default: 3593 addrconf_dev_config(dev); 3594 break; 3595 } 3596 3597 if (!IS_ERR_OR_NULL(idev)) { 3598 if (run_pending) 3599 addrconf_dad_run(idev, false); 3600 3601 /* Device has an address by now */ 3602 rt6_sync_up(dev, RTNH_F_DEAD); 3603 3604 /* 3605 * If the MTU changed during the interface down, 3606 * when the interface up, the changed MTU must be 3607 * reflected in the idev as well as routers. 3608 */ 3609 if (idev->cnf.mtu6 != dev->mtu && 3610 dev->mtu >= IPV6_MIN_MTU) { 3611 rt6_mtu_change(dev, dev->mtu); 3612 idev->cnf.mtu6 = dev->mtu; 3613 } 3614 idev->tstamp = jiffies; 3615 inet6_ifinfo_notify(RTM_NEWLINK, idev); 3616 3617 /* 3618 * If the changed mtu during down is lower than 3619 * IPV6_MIN_MTU stop IPv6 on this interface. 3620 */ 3621 if (dev->mtu < IPV6_MIN_MTU) 3622 addrconf_ifdown(dev, dev != net->loopback_dev); 3623 } 3624 break; 3625 3626 case NETDEV_DOWN: 3627 case NETDEV_UNREGISTER: 3628 /* 3629 * Remove all addresses from this interface. 3630 */ 3631 addrconf_ifdown(dev, event != NETDEV_DOWN); 3632 break; 3633 3634 case NETDEV_CHANGENAME: 3635 if (idev) { 3636 snmp6_unregister_dev(idev); 3637 addrconf_sysctl_unregister(idev); 3638 err = addrconf_sysctl_register(idev); 3639 if (err) 3640 return notifier_from_errno(err); 3641 err = snmp6_register_dev(idev); 3642 if (err) { 3643 addrconf_sysctl_unregister(idev); 3644 return notifier_from_errno(err); 3645 } 3646 } 3647 break; 3648 3649 case NETDEV_PRE_TYPE_CHANGE: 3650 case NETDEV_POST_TYPE_CHANGE: 3651 if (idev) 3652 addrconf_type_change(dev, event); 3653 break; 3654 3655 case NETDEV_CHANGEUPPER: 3656 info = ptr; 3657 3658 /* flush all routes if dev is linked to or unlinked from 3659 * an L3 master device (e.g., VRF) 3660 */ 3661 if (info->upper_dev && netif_is_l3_master(info->upper_dev)) 3662 addrconf_ifdown(dev, false); 3663 } 3664 3665 return NOTIFY_OK; 3666 } 3667 3668 /* 3669 * addrconf module should be notified of a device going up 3670 */ 3671 static struct notifier_block ipv6_dev_notf = { 3672 .notifier_call = addrconf_notify, 3673 .priority = ADDRCONF_NOTIFY_PRIORITY, 3674 }; 3675 3676 static void addrconf_type_change(struct net_device *dev, unsigned long event) 3677 { 3678 struct inet6_dev *idev; 3679 ASSERT_RTNL(); 3680 3681 idev = __in6_dev_get(dev); 3682 3683 if (event == NETDEV_POST_TYPE_CHANGE) 3684 ipv6_mc_remap(idev); 3685 else if (event == NETDEV_PRE_TYPE_CHANGE) 3686 ipv6_mc_unmap(idev); 3687 } 3688 3689 static bool addr_is_local(const struct in6_addr *addr) 3690 { 3691 return ipv6_addr_type(addr) & 3692 (IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK); 3693 } 3694 3695 static int addrconf_ifdown(struct net_device *dev, bool unregister) 3696 { 3697 unsigned long event = unregister ? NETDEV_UNREGISTER : NETDEV_DOWN; 3698 struct net *net = dev_net(dev); 3699 struct inet6_dev *idev; 3700 struct inet6_ifaddr *ifa, *tmp; 3701 bool keep_addr = false; 3702 int state, i; 3703 3704 ASSERT_RTNL(); 3705 3706 rt6_disable_ip(dev, event); 3707 3708 idev = __in6_dev_get(dev); 3709 if (!idev) 3710 return -ENODEV; 3711 3712 /* 3713 * Step 1: remove reference to ipv6 device from parent device. 3714 * Do not dev_put! 3715 */ 3716 if (unregister) { 3717 idev->dead = 1; 3718 3719 /* protected by rtnl_lock */ 3720 RCU_INIT_POINTER(dev->ip6_ptr, NULL); 3721 3722 /* Step 1.5: remove snmp6 entry */ 3723 snmp6_unregister_dev(idev); 3724 3725 } 3726 3727 /* combine the user config with event to determine if permanent 3728 * addresses are to be removed from address hash table 3729 */ 3730 if (!unregister && !idev->cnf.disable_ipv6) { 3731 /* aggregate the system setting and interface setting */ 3732 int _keep_addr = net->ipv6.devconf_all->keep_addr_on_down; 3733 3734 if (!_keep_addr) 3735 _keep_addr = idev->cnf.keep_addr_on_down; 3736 3737 keep_addr = (_keep_addr > 0); 3738 } 3739 3740 /* Step 2: clear hash table */ 3741 for (i = 0; i < IN6_ADDR_HSIZE; i++) { 3742 struct hlist_head *h = &inet6_addr_lst[i]; 3743 3744 spin_lock_bh(&addrconf_hash_lock); 3745 restart: 3746 hlist_for_each_entry_rcu(ifa, h, addr_lst) { 3747 if (ifa->idev == idev) { 3748 addrconf_del_dad_work(ifa); 3749 /* combined flag + permanent flag decide if 3750 * address is retained on a down event 3751 */ 3752 if (!keep_addr || 3753 !(ifa->flags & IFA_F_PERMANENT) || 3754 addr_is_local(&ifa->addr)) { 3755 hlist_del_init_rcu(&ifa->addr_lst); 3756 goto restart; 3757 } 3758 } 3759 } 3760 spin_unlock_bh(&addrconf_hash_lock); 3761 } 3762 3763 write_lock_bh(&idev->lock); 3764 3765 addrconf_del_rs_timer(idev); 3766 3767 /* Step 2: clear flags for stateless addrconf */ 3768 if (!unregister) 3769 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY); 3770 3771 /* Step 3: clear tempaddr list */ 3772 while (!list_empty(&idev->tempaddr_list)) { 3773 ifa = list_first_entry(&idev->tempaddr_list, 3774 struct inet6_ifaddr, tmp_list); 3775 list_del(&ifa->tmp_list); 3776 write_unlock_bh(&idev->lock); 3777 spin_lock_bh(&ifa->lock); 3778 3779 if (ifa->ifpub) { 3780 in6_ifa_put(ifa->ifpub); 3781 ifa->ifpub = NULL; 3782 } 3783 spin_unlock_bh(&ifa->lock); 3784 in6_ifa_put(ifa); 3785 write_lock_bh(&idev->lock); 3786 } 3787 3788 list_for_each_entry_safe(ifa, tmp, &idev->addr_list, if_list) { 3789 struct fib6_info *rt = NULL; 3790 bool keep; 3791 3792 addrconf_del_dad_work(ifa); 3793 3794 keep = keep_addr && (ifa->flags & IFA_F_PERMANENT) && 3795 !addr_is_local(&ifa->addr); 3796 3797 write_unlock_bh(&idev->lock); 3798 spin_lock_bh(&ifa->lock); 3799 3800 if (keep) { 3801 /* set state to skip the notifier below */ 3802 state = INET6_IFADDR_STATE_DEAD; 3803 ifa->state = INET6_IFADDR_STATE_PREDAD; 3804 if (!(ifa->flags & IFA_F_NODAD)) 3805 ifa->flags |= IFA_F_TENTATIVE; 3806 3807 rt = ifa->rt; 3808 ifa->rt = NULL; 3809 } else { 3810 state = ifa->state; 3811 ifa->state = INET6_IFADDR_STATE_DEAD; 3812 } 3813 3814 spin_unlock_bh(&ifa->lock); 3815 3816 if (rt) 3817 ip6_del_rt(net, rt, false); 3818 3819 if (state != INET6_IFADDR_STATE_DEAD) { 3820 __ipv6_ifa_notify(RTM_DELADDR, ifa); 3821 inet6addr_notifier_call_chain(NETDEV_DOWN, ifa); 3822 } else { 3823 if (idev->cnf.forwarding) 3824 addrconf_leave_anycast(ifa); 3825 addrconf_leave_solict(ifa->idev, &ifa->addr); 3826 } 3827 3828 write_lock_bh(&idev->lock); 3829 if (!keep) { 3830 list_del_rcu(&ifa->if_list); 3831 in6_ifa_put(ifa); 3832 } 3833 } 3834 3835 write_unlock_bh(&idev->lock); 3836 3837 /* Step 5: Discard anycast and multicast list */ 3838 if (unregister) { 3839 ipv6_ac_destroy_dev(idev); 3840 ipv6_mc_destroy_dev(idev); 3841 } else { 3842 ipv6_mc_down(idev); 3843 } 3844 3845 idev->tstamp = jiffies; 3846 3847 /* Last: Shot the device (if unregistered) */ 3848 if (unregister) { 3849 addrconf_sysctl_unregister(idev); 3850 neigh_parms_release(&nd_tbl, idev->nd_parms); 3851 neigh_ifdown(&nd_tbl, dev); 3852 in6_dev_put(idev); 3853 } 3854 return 0; 3855 } 3856 3857 static void addrconf_rs_timer(struct timer_list *t) 3858 { 3859 struct inet6_dev *idev = from_timer(idev, t, rs_timer); 3860 struct net_device *dev = idev->dev; 3861 struct in6_addr lladdr; 3862 3863 write_lock(&idev->lock); 3864 if (idev->dead || !(idev->if_flags & IF_READY)) 3865 goto out; 3866 3867 if (!ipv6_accept_ra(idev)) 3868 goto out; 3869 3870 /* Announcement received after solicitation was sent */ 3871 if (idev->if_flags & IF_RA_RCVD) 3872 goto out; 3873 3874 if (idev->rs_probes++ < idev->cnf.rtr_solicits || idev->cnf.rtr_solicits < 0) { 3875 write_unlock(&idev->lock); 3876 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE)) 3877 ndisc_send_rs(dev, &lladdr, 3878 &in6addr_linklocal_allrouters); 3879 else 3880 goto put; 3881 3882 write_lock(&idev->lock); 3883 idev->rs_interval = rfc3315_s14_backoff_update( 3884 idev->rs_interval, idev->cnf.rtr_solicit_max_interval); 3885 /* The wait after the last probe can be shorter */ 3886 addrconf_mod_rs_timer(idev, (idev->rs_probes == 3887 idev->cnf.rtr_solicits) ? 3888 idev->cnf.rtr_solicit_delay : 3889 idev->rs_interval); 3890 } else { 3891 /* 3892 * Note: we do not support deprecated "all on-link" 3893 * assumption any longer. 3894 */ 3895 pr_debug("%s: no IPv6 routers present\n", idev->dev->name); 3896 } 3897 3898 out: 3899 write_unlock(&idev->lock); 3900 put: 3901 in6_dev_put(idev); 3902 } 3903 3904 /* 3905 * Duplicate Address Detection 3906 */ 3907 static void addrconf_dad_kick(struct inet6_ifaddr *ifp) 3908 { 3909 unsigned long rand_num; 3910 struct inet6_dev *idev = ifp->idev; 3911 u64 nonce; 3912 3913 if (ifp->flags & IFA_F_OPTIMISTIC) 3914 rand_num = 0; 3915 else 3916 rand_num = prandom_u32() % (idev->cnf.rtr_solicit_delay ? : 1); 3917 3918 nonce = 0; 3919 if (idev->cnf.enhanced_dad || 3920 dev_net(idev->dev)->ipv6.devconf_all->enhanced_dad) { 3921 do 3922 get_random_bytes(&nonce, 6); 3923 while (nonce == 0); 3924 } 3925 ifp->dad_nonce = nonce; 3926 ifp->dad_probes = idev->cnf.dad_transmits; 3927 addrconf_mod_dad_work(ifp, rand_num); 3928 } 3929 3930 static void addrconf_dad_begin(struct inet6_ifaddr *ifp) 3931 { 3932 struct inet6_dev *idev = ifp->idev; 3933 struct net_device *dev = idev->dev; 3934 bool bump_id, notify = false; 3935 struct net *net; 3936 3937 addrconf_join_solict(dev, &ifp->addr); 3938 3939 prandom_seed((__force u32) ifp->addr.s6_addr32[3]); 3940 3941 read_lock_bh(&idev->lock); 3942 spin_lock(&ifp->lock); 3943 if (ifp->state == INET6_IFADDR_STATE_DEAD) 3944 goto out; 3945 3946 net = dev_net(dev); 3947 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) || 3948 (net->ipv6.devconf_all->accept_dad < 1 && 3949 idev->cnf.accept_dad < 1) || 3950 !(ifp->flags&IFA_F_TENTATIVE) || 3951 ifp->flags & IFA_F_NODAD) { 3952 bool send_na = false; 3953 3954 if (ifp->flags & IFA_F_TENTATIVE && 3955 !(ifp->flags & IFA_F_OPTIMISTIC)) 3956 send_na = true; 3957 bump_id = ifp->flags & IFA_F_TENTATIVE; 3958 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED); 3959 spin_unlock(&ifp->lock); 3960 read_unlock_bh(&idev->lock); 3961 3962 addrconf_dad_completed(ifp, bump_id, send_na); 3963 return; 3964 } 3965 3966 if (!(idev->if_flags & IF_READY)) { 3967 spin_unlock(&ifp->lock); 3968 read_unlock_bh(&idev->lock); 3969 /* 3970 * If the device is not ready: 3971 * - keep it tentative if it is a permanent address. 3972 * - otherwise, kill it. 3973 */ 3974 in6_ifa_hold(ifp); 3975 addrconf_dad_stop(ifp, 0); 3976 return; 3977 } 3978 3979 /* 3980 * Optimistic nodes can start receiving 3981 * Frames right away 3982 */ 3983 if (ifp->flags & IFA_F_OPTIMISTIC) { 3984 ip6_ins_rt(net, ifp->rt); 3985 if (ipv6_use_optimistic_addr(net, idev)) { 3986 /* Because optimistic nodes can use this address, 3987 * notify listeners. If DAD fails, RTM_DELADDR is sent. 3988 */ 3989 notify = true; 3990 } 3991 } 3992 3993 addrconf_dad_kick(ifp); 3994 out: 3995 spin_unlock(&ifp->lock); 3996 read_unlock_bh(&idev->lock); 3997 if (notify) 3998 ipv6_ifa_notify(RTM_NEWADDR, ifp); 3999 } 4000 4001 static void addrconf_dad_start(struct inet6_ifaddr *ifp) 4002 { 4003 bool begin_dad = false; 4004 4005 spin_lock_bh(&ifp->lock); 4006 if (ifp->state != INET6_IFADDR_STATE_DEAD) { 4007 ifp->state = INET6_IFADDR_STATE_PREDAD; 4008 begin_dad = true; 4009 } 4010 spin_unlock_bh(&ifp->lock); 4011 4012 if (begin_dad) 4013 addrconf_mod_dad_work(ifp, 0); 4014 } 4015 4016 static void addrconf_dad_work(struct work_struct *w) 4017 { 4018 struct inet6_ifaddr *ifp = container_of(to_delayed_work(w), 4019 struct inet6_ifaddr, 4020 dad_work); 4021 struct inet6_dev *idev = ifp->idev; 4022 bool bump_id, disable_ipv6 = false; 4023 struct in6_addr mcaddr; 4024 4025 enum { 4026 DAD_PROCESS, 4027 DAD_BEGIN, 4028 DAD_ABORT, 4029 } action = DAD_PROCESS; 4030 4031 rtnl_lock(); 4032 4033 spin_lock_bh(&ifp->lock); 4034 if (ifp->state == INET6_IFADDR_STATE_PREDAD) { 4035 action = DAD_BEGIN; 4036 ifp->state = INET6_IFADDR_STATE_DAD; 4037 } else if (ifp->state == INET6_IFADDR_STATE_ERRDAD) { 4038 action = DAD_ABORT; 4039 ifp->state = INET6_IFADDR_STATE_POSTDAD; 4040 4041 if ((dev_net(idev->dev)->ipv6.devconf_all->accept_dad > 1 || 4042 idev->cnf.accept_dad > 1) && 4043 !idev->cnf.disable_ipv6 && 4044 !(ifp->flags & IFA_F_STABLE_PRIVACY)) { 4045 struct in6_addr addr; 4046 4047 addr.s6_addr32[0] = htonl(0xfe800000); 4048 addr.s6_addr32[1] = 0; 4049 4050 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) && 4051 ipv6_addr_equal(&ifp->addr, &addr)) { 4052 /* DAD failed for link-local based on MAC */ 4053 idev->cnf.disable_ipv6 = 1; 4054 4055 pr_info("%s: IPv6 being disabled!\n", 4056 ifp->idev->dev->name); 4057 disable_ipv6 = true; 4058 } 4059 } 4060 } 4061 spin_unlock_bh(&ifp->lock); 4062 4063 if (action == DAD_BEGIN) { 4064 addrconf_dad_begin(ifp); 4065 goto out; 4066 } else if (action == DAD_ABORT) { 4067 in6_ifa_hold(ifp); 4068 addrconf_dad_stop(ifp, 1); 4069 if (disable_ipv6) 4070 addrconf_ifdown(idev->dev, false); 4071 goto out; 4072 } 4073 4074 if (!ifp->dad_probes && addrconf_dad_end(ifp)) 4075 goto out; 4076 4077 write_lock_bh(&idev->lock); 4078 if (idev->dead || !(idev->if_flags & IF_READY)) { 4079 write_unlock_bh(&idev->lock); 4080 goto out; 4081 } 4082 4083 spin_lock(&ifp->lock); 4084 if (ifp->state == INET6_IFADDR_STATE_DEAD) { 4085 spin_unlock(&ifp->lock); 4086 write_unlock_bh(&idev->lock); 4087 goto out; 4088 } 4089 4090 if (ifp->dad_probes == 0) { 4091 bool send_na = false; 4092 4093 /* 4094 * DAD was successful 4095 */ 4096 4097 if (ifp->flags & IFA_F_TENTATIVE && 4098 !(ifp->flags & IFA_F_OPTIMISTIC)) 4099 send_na = true; 4100 bump_id = ifp->flags & IFA_F_TENTATIVE; 4101 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED); 4102 spin_unlock(&ifp->lock); 4103 write_unlock_bh(&idev->lock); 4104 4105 addrconf_dad_completed(ifp, bump_id, send_na); 4106 4107 goto out; 4108 } 4109 4110 ifp->dad_probes--; 4111 addrconf_mod_dad_work(ifp, 4112 max(NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME), 4113 HZ/100)); 4114 spin_unlock(&ifp->lock); 4115 write_unlock_bh(&idev->lock); 4116 4117 /* send a neighbour solicitation for our addr */ 4118 addrconf_addr_solict_mult(&ifp->addr, &mcaddr); 4119 ndisc_send_ns(ifp->idev->dev, &ifp->addr, &mcaddr, &in6addr_any, 4120 ifp->dad_nonce); 4121 out: 4122 in6_ifa_put(ifp); 4123 rtnl_unlock(); 4124 } 4125 4126 /* ifp->idev must be at least read locked */ 4127 static bool ipv6_lonely_lladdr(struct inet6_ifaddr *ifp) 4128 { 4129 struct inet6_ifaddr *ifpiter; 4130 struct inet6_dev *idev = ifp->idev; 4131 4132 list_for_each_entry_reverse(ifpiter, &idev->addr_list, if_list) { 4133 if (ifpiter->scope > IFA_LINK) 4134 break; 4135 if (ifp != ifpiter && ifpiter->scope == IFA_LINK && 4136 (ifpiter->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE| 4137 IFA_F_OPTIMISTIC|IFA_F_DADFAILED)) == 4138 IFA_F_PERMANENT) 4139 return false; 4140 } 4141 return true; 4142 } 4143 4144 static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id, 4145 bool send_na) 4146 { 4147 struct net_device *dev = ifp->idev->dev; 4148 struct in6_addr lladdr; 4149 bool send_rs, send_mld; 4150 4151 addrconf_del_dad_work(ifp); 4152 4153 /* 4154 * Configure the address for reception. Now it is valid. 4155 */ 4156 4157 ipv6_ifa_notify(RTM_NEWADDR, ifp); 4158 4159 /* If added prefix is link local and we are prepared to process 4160 router advertisements, start sending router solicitations. 4161 */ 4162 4163 read_lock_bh(&ifp->idev->lock); 4164 send_mld = ifp->scope == IFA_LINK && ipv6_lonely_lladdr(ifp); 4165 send_rs = send_mld && 4166 ipv6_accept_ra(ifp->idev) && 4167 ifp->idev->cnf.rtr_solicits != 0 && 4168 (dev->flags&IFF_LOOPBACK) == 0; 4169 read_unlock_bh(&ifp->idev->lock); 4170 4171 /* While dad is in progress mld report's source address is in6_addrany. 4172 * Resend with proper ll now. 4173 */ 4174 if (send_mld) 4175 ipv6_mc_dad_complete(ifp->idev); 4176 4177 /* send unsolicited NA if enabled */ 4178 if (send_na && 4179 (ifp->idev->cnf.ndisc_notify || 4180 dev_net(dev)->ipv6.devconf_all->ndisc_notify)) { 4181 ndisc_send_na(dev, &in6addr_linklocal_allnodes, &ifp->addr, 4182 /*router=*/ !!ifp->idev->cnf.forwarding, 4183 /*solicited=*/ false, /*override=*/ true, 4184 /*inc_opt=*/ true); 4185 } 4186 4187 if (send_rs) { 4188 /* 4189 * If a host as already performed a random delay 4190 * [...] as part of DAD [...] there is no need 4191 * to delay again before sending the first RS 4192 */ 4193 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE)) 4194 return; 4195 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters); 4196 4197 write_lock_bh(&ifp->idev->lock); 4198 spin_lock(&ifp->lock); 4199 ifp->idev->rs_interval = rfc3315_s14_backoff_init( 4200 ifp->idev->cnf.rtr_solicit_interval); 4201 ifp->idev->rs_probes = 1; 4202 ifp->idev->if_flags |= IF_RS_SENT; 4203 addrconf_mod_rs_timer(ifp->idev, ifp->idev->rs_interval); 4204 spin_unlock(&ifp->lock); 4205 write_unlock_bh(&ifp->idev->lock); 4206 } 4207 4208 if (bump_id) 4209 rt_genid_bump_ipv6(dev_net(dev)); 4210 4211 /* Make sure that a new temporary address will be created 4212 * before this temporary address becomes deprecated. 4213 */ 4214 if (ifp->flags & IFA_F_TEMPORARY) 4215 addrconf_verify_rtnl(); 4216 } 4217 4218 static void addrconf_dad_run(struct inet6_dev *idev, bool restart) 4219 { 4220 struct inet6_ifaddr *ifp; 4221 4222 read_lock_bh(&idev->lock); 4223 list_for_each_entry(ifp, &idev->addr_list, if_list) { 4224 spin_lock(&ifp->lock); 4225 if ((ifp->flags & IFA_F_TENTATIVE && 4226 ifp->state == INET6_IFADDR_STATE_DAD) || restart) { 4227 if (restart) 4228 ifp->state = INET6_IFADDR_STATE_PREDAD; 4229 addrconf_dad_kick(ifp); 4230 } 4231 spin_unlock(&ifp->lock); 4232 } 4233 read_unlock_bh(&idev->lock); 4234 } 4235 4236 #ifdef CONFIG_PROC_FS 4237 struct if6_iter_state { 4238 struct seq_net_private p; 4239 int bucket; 4240 int offset; 4241 }; 4242 4243 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos) 4244 { 4245 struct if6_iter_state *state = seq->private; 4246 struct net *net = seq_file_net(seq); 4247 struct inet6_ifaddr *ifa = NULL; 4248 int p = 0; 4249 4250 /* initial bucket if pos is 0 */ 4251 if (pos == 0) { 4252 state->bucket = 0; 4253 state->offset = 0; 4254 } 4255 4256 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) { 4257 hlist_for_each_entry_rcu(ifa, &inet6_addr_lst[state->bucket], 4258 addr_lst) { 4259 if (!net_eq(dev_net(ifa->idev->dev), net)) 4260 continue; 4261 /* sync with offset */ 4262 if (p < state->offset) { 4263 p++; 4264 continue; 4265 } 4266 return ifa; 4267 } 4268 4269 /* prepare for next bucket */ 4270 state->offset = 0; 4271 p = 0; 4272 } 4273 return NULL; 4274 } 4275 4276 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, 4277 struct inet6_ifaddr *ifa) 4278 { 4279 struct if6_iter_state *state = seq->private; 4280 struct net *net = seq_file_net(seq); 4281 4282 hlist_for_each_entry_continue_rcu(ifa, addr_lst) { 4283 if (!net_eq(dev_net(ifa->idev->dev), net)) 4284 continue; 4285 state->offset++; 4286 return ifa; 4287 } 4288 4289 state->offset = 0; 4290 while (++state->bucket < IN6_ADDR_HSIZE) { 4291 hlist_for_each_entry_rcu(ifa, 4292 &inet6_addr_lst[state->bucket], addr_lst) { 4293 if (!net_eq(dev_net(ifa->idev->dev), net)) 4294 continue; 4295 return ifa; 4296 } 4297 } 4298 4299 return NULL; 4300 } 4301 4302 static void *if6_seq_start(struct seq_file *seq, loff_t *pos) 4303 __acquires(rcu) 4304 { 4305 rcu_read_lock(); 4306 return if6_get_first(seq, *pos); 4307 } 4308 4309 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos) 4310 { 4311 struct inet6_ifaddr *ifa; 4312 4313 ifa = if6_get_next(seq, v); 4314 ++*pos; 4315 return ifa; 4316 } 4317 4318 static void if6_seq_stop(struct seq_file *seq, void *v) 4319 __releases(rcu) 4320 { 4321 rcu_read_unlock(); 4322 } 4323 4324 static int if6_seq_show(struct seq_file *seq, void *v) 4325 { 4326 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v; 4327 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n", 4328 &ifp->addr, 4329 ifp->idev->dev->ifindex, 4330 ifp->prefix_len, 4331 ifp->scope, 4332 (u8) ifp->flags, 4333 ifp->idev->dev->name); 4334 return 0; 4335 } 4336 4337 static const struct seq_operations if6_seq_ops = { 4338 .start = if6_seq_start, 4339 .next = if6_seq_next, 4340 .show = if6_seq_show, 4341 .stop = if6_seq_stop, 4342 }; 4343 4344 static int __net_init if6_proc_net_init(struct net *net) 4345 { 4346 if (!proc_create_net("if_inet6", 0444, net->proc_net, &if6_seq_ops, 4347 sizeof(struct if6_iter_state))) 4348 return -ENOMEM; 4349 return 0; 4350 } 4351 4352 static void __net_exit if6_proc_net_exit(struct net *net) 4353 { 4354 remove_proc_entry("if_inet6", net->proc_net); 4355 } 4356 4357 static struct pernet_operations if6_proc_net_ops = { 4358 .init = if6_proc_net_init, 4359 .exit = if6_proc_net_exit, 4360 }; 4361 4362 int __init if6_proc_init(void) 4363 { 4364 return register_pernet_subsys(&if6_proc_net_ops); 4365 } 4366 4367 void if6_proc_exit(void) 4368 { 4369 unregister_pernet_subsys(&if6_proc_net_ops); 4370 } 4371 #endif /* CONFIG_PROC_FS */ 4372 4373 #if IS_ENABLED(CONFIG_IPV6_MIP6) 4374 /* Check if address is a home address configured on any interface. */ 4375 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr) 4376 { 4377 unsigned int hash = inet6_addr_hash(net, addr); 4378 struct inet6_ifaddr *ifp = NULL; 4379 int ret = 0; 4380 4381 rcu_read_lock(); 4382 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) { 4383 if (!net_eq(dev_net(ifp->idev->dev), net)) 4384 continue; 4385 if (ipv6_addr_equal(&ifp->addr, addr) && 4386 (ifp->flags & IFA_F_HOMEADDRESS)) { 4387 ret = 1; 4388 break; 4389 } 4390 } 4391 rcu_read_unlock(); 4392 return ret; 4393 } 4394 #endif 4395 4396 /* RFC6554 has some algorithm to avoid loops in segment routing by 4397 * checking if the segments contains any of a local interface address. 4398 * 4399 * Quote: 4400 * 4401 * To detect loops in the SRH, a router MUST determine if the SRH 4402 * includes multiple addresses assigned to any interface on that router. 4403 * If such addresses appear more than once and are separated by at least 4404 * one address not assigned to that router. 4405 */ 4406 int ipv6_chk_rpl_srh_loop(struct net *net, const struct in6_addr *segs, 4407 unsigned char nsegs) 4408 { 4409 const struct in6_addr *addr; 4410 int i, ret = 0, found = 0; 4411 struct inet6_ifaddr *ifp; 4412 bool separated = false; 4413 unsigned int hash; 4414 bool hash_found; 4415 4416 rcu_read_lock(); 4417 for (i = 0; i < nsegs; i++) { 4418 addr = &segs[i]; 4419 hash = inet6_addr_hash(net, addr); 4420 4421 hash_found = false; 4422 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) { 4423 if (!net_eq(dev_net(ifp->idev->dev), net)) 4424 continue; 4425 4426 if (ipv6_addr_equal(&ifp->addr, addr)) { 4427 hash_found = true; 4428 break; 4429 } 4430 } 4431 4432 if (hash_found) { 4433 if (found > 1 && separated) { 4434 ret = 1; 4435 break; 4436 } 4437 4438 separated = false; 4439 found++; 4440 } else { 4441 separated = true; 4442 } 4443 } 4444 rcu_read_unlock(); 4445 4446 return ret; 4447 } 4448 4449 /* 4450 * Periodic address status verification 4451 */ 4452 4453 static void addrconf_verify_rtnl(void) 4454 { 4455 unsigned long now, next, next_sec, next_sched; 4456 struct inet6_ifaddr *ifp; 4457 int i; 4458 4459 ASSERT_RTNL(); 4460 4461 rcu_read_lock_bh(); 4462 now = jiffies; 4463 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY); 4464 4465 cancel_delayed_work(&addr_chk_work); 4466 4467 for (i = 0; i < IN6_ADDR_HSIZE; i++) { 4468 restart: 4469 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[i], addr_lst) { 4470 unsigned long age; 4471 4472 /* When setting preferred_lft to a value not zero or 4473 * infinity, while valid_lft is infinity 4474 * IFA_F_PERMANENT has a non-infinity life time. 4475 */ 4476 if ((ifp->flags & IFA_F_PERMANENT) && 4477 (ifp->prefered_lft == INFINITY_LIFE_TIME)) 4478 continue; 4479 4480 spin_lock(&ifp->lock); 4481 /* We try to batch several events at once. */ 4482 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ; 4483 4484 if (ifp->valid_lft != INFINITY_LIFE_TIME && 4485 age >= ifp->valid_lft) { 4486 spin_unlock(&ifp->lock); 4487 in6_ifa_hold(ifp); 4488 rcu_read_unlock_bh(); 4489 ipv6_del_addr(ifp); 4490 rcu_read_lock_bh(); 4491 goto restart; 4492 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) { 4493 spin_unlock(&ifp->lock); 4494 continue; 4495 } else if (age >= ifp->prefered_lft) { 4496 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */ 4497 int deprecate = 0; 4498 4499 if (!(ifp->flags&IFA_F_DEPRECATED)) { 4500 deprecate = 1; 4501 ifp->flags |= IFA_F_DEPRECATED; 4502 } 4503 4504 if ((ifp->valid_lft != INFINITY_LIFE_TIME) && 4505 (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))) 4506 next = ifp->tstamp + ifp->valid_lft * HZ; 4507 4508 spin_unlock(&ifp->lock); 4509 4510 if (deprecate) { 4511 in6_ifa_hold(ifp); 4512 4513 ipv6_ifa_notify(0, ifp); 4514 in6_ifa_put(ifp); 4515 goto restart; 4516 } 4517 } else if ((ifp->flags&IFA_F_TEMPORARY) && 4518 !(ifp->flags&IFA_F_TENTATIVE)) { 4519 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry * 4520 ifp->idev->cnf.dad_transmits * 4521 max(NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME), HZ/100) / HZ; 4522 4523 if (age >= ifp->prefered_lft - regen_advance) { 4524 struct inet6_ifaddr *ifpub = ifp->ifpub; 4525 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 4526 next = ifp->tstamp + ifp->prefered_lft * HZ; 4527 if (!ifp->regen_count && ifpub) { 4528 ifp->regen_count++; 4529 in6_ifa_hold(ifp); 4530 in6_ifa_hold(ifpub); 4531 spin_unlock(&ifp->lock); 4532 4533 spin_lock(&ifpub->lock); 4534 ifpub->regen_count = 0; 4535 spin_unlock(&ifpub->lock); 4536 rcu_read_unlock_bh(); 4537 ipv6_create_tempaddr(ifpub, true); 4538 in6_ifa_put(ifpub); 4539 in6_ifa_put(ifp); 4540 rcu_read_lock_bh(); 4541 goto restart; 4542 } 4543 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next)) 4544 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ; 4545 spin_unlock(&ifp->lock); 4546 } else { 4547 /* ifp->prefered_lft <= ifp->valid_lft */ 4548 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 4549 next = ifp->tstamp + ifp->prefered_lft * HZ; 4550 spin_unlock(&ifp->lock); 4551 } 4552 } 4553 } 4554 4555 next_sec = round_jiffies_up(next); 4556 next_sched = next; 4557 4558 /* If rounded timeout is accurate enough, accept it. */ 4559 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ)) 4560 next_sched = next_sec; 4561 4562 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */ 4563 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX)) 4564 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX; 4565 4566 pr_debug("now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n", 4567 now, next, next_sec, next_sched); 4568 mod_delayed_work(addrconf_wq, &addr_chk_work, next_sched - now); 4569 rcu_read_unlock_bh(); 4570 } 4571 4572 static void addrconf_verify_work(struct work_struct *w) 4573 { 4574 rtnl_lock(); 4575 addrconf_verify_rtnl(); 4576 rtnl_unlock(); 4577 } 4578 4579 static void addrconf_verify(void) 4580 { 4581 mod_delayed_work(addrconf_wq, &addr_chk_work, 0); 4582 } 4583 4584 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local, 4585 struct in6_addr **peer_pfx) 4586 { 4587 struct in6_addr *pfx = NULL; 4588 4589 *peer_pfx = NULL; 4590 4591 if (addr) 4592 pfx = nla_data(addr); 4593 4594 if (local) { 4595 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx))) 4596 *peer_pfx = pfx; 4597 pfx = nla_data(local); 4598 } 4599 4600 return pfx; 4601 } 4602 4603 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = { 4604 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) }, 4605 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) }, 4606 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) }, 4607 [IFA_FLAGS] = { .len = sizeof(u32) }, 4608 [IFA_RT_PRIORITY] = { .len = sizeof(u32) }, 4609 [IFA_TARGET_NETNSID] = { .type = NLA_S32 }, 4610 }; 4611 4612 static int 4613 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, 4614 struct netlink_ext_ack *extack) 4615 { 4616 struct net *net = sock_net(skb->sk); 4617 struct ifaddrmsg *ifm; 4618 struct nlattr *tb[IFA_MAX+1]; 4619 struct in6_addr *pfx, *peer_pfx; 4620 u32 ifa_flags; 4621 int err; 4622 4623 err = nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX, 4624 ifa_ipv6_policy, extack); 4625 if (err < 0) 4626 return err; 4627 4628 ifm = nlmsg_data(nlh); 4629 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx); 4630 if (!pfx) 4631 return -EINVAL; 4632 4633 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags; 4634 4635 /* We ignore other flags so far. */ 4636 ifa_flags &= IFA_F_MANAGETEMPADDR; 4637 4638 return inet6_addr_del(net, ifm->ifa_index, ifa_flags, pfx, 4639 ifm->ifa_prefixlen); 4640 } 4641 4642 static int modify_prefix_route(struct inet6_ifaddr *ifp, 4643 unsigned long expires, u32 flags, 4644 bool modify_peer) 4645 { 4646 struct fib6_info *f6i; 4647 u32 prio; 4648 4649 f6i = addrconf_get_prefix_route(modify_peer ? &ifp->peer_addr : &ifp->addr, 4650 ifp->prefix_len, 4651 ifp->idev->dev, 0, RTF_DEFAULT, true); 4652 if (!f6i) 4653 return -ENOENT; 4654 4655 prio = ifp->rt_priority ? : IP6_RT_PRIO_ADDRCONF; 4656 if (f6i->fib6_metric != prio) { 4657 /* delete old one */ 4658 ip6_del_rt(dev_net(ifp->idev->dev), f6i, false); 4659 4660 /* add new one */ 4661 addrconf_prefix_route(modify_peer ? &ifp->peer_addr : &ifp->addr, 4662 ifp->prefix_len, 4663 ifp->rt_priority, ifp->idev->dev, 4664 expires, flags, GFP_KERNEL); 4665 } else { 4666 if (!expires) 4667 fib6_clean_expires(f6i); 4668 else 4669 fib6_set_expires(f6i, expires); 4670 4671 fib6_info_release(f6i); 4672 } 4673 4674 return 0; 4675 } 4676 4677 static int inet6_addr_modify(struct inet6_ifaddr *ifp, struct ifa6_config *cfg) 4678 { 4679 u32 flags; 4680 clock_t expires; 4681 unsigned long timeout; 4682 bool was_managetempaddr; 4683 bool had_prefixroute; 4684 bool new_peer = false; 4685 4686 ASSERT_RTNL(); 4687 4688 if (!cfg->valid_lft || cfg->preferred_lft > cfg->valid_lft) 4689 return -EINVAL; 4690 4691 if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR && 4692 (ifp->flags & IFA_F_TEMPORARY || ifp->prefix_len != 64)) 4693 return -EINVAL; 4694 4695 if (!(ifp->flags & IFA_F_TENTATIVE) || ifp->flags & IFA_F_DADFAILED) 4696 cfg->ifa_flags &= ~IFA_F_OPTIMISTIC; 4697 4698 timeout = addrconf_timeout_fixup(cfg->valid_lft, HZ); 4699 if (addrconf_finite_timeout(timeout)) { 4700 expires = jiffies_to_clock_t(timeout * HZ); 4701 cfg->valid_lft = timeout; 4702 flags = RTF_EXPIRES; 4703 } else { 4704 expires = 0; 4705 flags = 0; 4706 cfg->ifa_flags |= IFA_F_PERMANENT; 4707 } 4708 4709 timeout = addrconf_timeout_fixup(cfg->preferred_lft, HZ); 4710 if (addrconf_finite_timeout(timeout)) { 4711 if (timeout == 0) 4712 cfg->ifa_flags |= IFA_F_DEPRECATED; 4713 cfg->preferred_lft = timeout; 4714 } 4715 4716 if (cfg->peer_pfx && 4717 memcmp(&ifp->peer_addr, cfg->peer_pfx, sizeof(struct in6_addr))) { 4718 if (!ipv6_addr_any(&ifp->peer_addr)) 4719 cleanup_prefix_route(ifp, expires, true, true); 4720 new_peer = true; 4721 } 4722 4723 spin_lock_bh(&ifp->lock); 4724 was_managetempaddr = ifp->flags & IFA_F_MANAGETEMPADDR; 4725 had_prefixroute = ifp->flags & IFA_F_PERMANENT && 4726 !(ifp->flags & IFA_F_NOPREFIXROUTE); 4727 ifp->flags &= ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | 4728 IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR | 4729 IFA_F_NOPREFIXROUTE); 4730 ifp->flags |= cfg->ifa_flags; 4731 ifp->tstamp = jiffies; 4732 ifp->valid_lft = cfg->valid_lft; 4733 ifp->prefered_lft = cfg->preferred_lft; 4734 4735 if (cfg->rt_priority && cfg->rt_priority != ifp->rt_priority) 4736 ifp->rt_priority = cfg->rt_priority; 4737 4738 if (new_peer) 4739 ifp->peer_addr = *cfg->peer_pfx; 4740 4741 spin_unlock_bh(&ifp->lock); 4742 if (!(ifp->flags&IFA_F_TENTATIVE)) 4743 ipv6_ifa_notify(0, ifp); 4744 4745 if (!(cfg->ifa_flags & IFA_F_NOPREFIXROUTE)) { 4746 int rc = -ENOENT; 4747 4748 if (had_prefixroute) 4749 rc = modify_prefix_route(ifp, expires, flags, false); 4750 4751 /* prefix route could have been deleted; if so restore it */ 4752 if (rc == -ENOENT) { 4753 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, 4754 ifp->rt_priority, ifp->idev->dev, 4755 expires, flags, GFP_KERNEL); 4756 } 4757 4758 if (had_prefixroute && !ipv6_addr_any(&ifp->peer_addr)) 4759 rc = modify_prefix_route(ifp, expires, flags, true); 4760 4761 if (rc == -ENOENT && !ipv6_addr_any(&ifp->peer_addr)) { 4762 addrconf_prefix_route(&ifp->peer_addr, ifp->prefix_len, 4763 ifp->rt_priority, ifp->idev->dev, 4764 expires, flags, GFP_KERNEL); 4765 } 4766 } else if (had_prefixroute) { 4767 enum cleanup_prefix_rt_t action; 4768 unsigned long rt_expires; 4769 4770 write_lock_bh(&ifp->idev->lock); 4771 action = check_cleanup_prefix_route(ifp, &rt_expires); 4772 write_unlock_bh(&ifp->idev->lock); 4773 4774 if (action != CLEANUP_PREFIX_RT_NOP) { 4775 cleanup_prefix_route(ifp, rt_expires, 4776 action == CLEANUP_PREFIX_RT_DEL, false); 4777 } 4778 } 4779 4780 if (was_managetempaddr || ifp->flags & IFA_F_MANAGETEMPADDR) { 4781 if (was_managetempaddr && 4782 !(ifp->flags & IFA_F_MANAGETEMPADDR)) { 4783 cfg->valid_lft = 0; 4784 cfg->preferred_lft = 0; 4785 } 4786 manage_tempaddrs(ifp->idev, ifp, cfg->valid_lft, 4787 cfg->preferred_lft, !was_managetempaddr, 4788 jiffies); 4789 } 4790 4791 addrconf_verify_rtnl(); 4792 4793 return 0; 4794 } 4795 4796 static int 4797 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, 4798 struct netlink_ext_ack *extack) 4799 { 4800 struct net *net = sock_net(skb->sk); 4801 struct ifaddrmsg *ifm; 4802 struct nlattr *tb[IFA_MAX+1]; 4803 struct in6_addr *peer_pfx; 4804 struct inet6_ifaddr *ifa; 4805 struct net_device *dev; 4806 struct inet6_dev *idev; 4807 struct ifa6_config cfg; 4808 int err; 4809 4810 err = nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX, 4811 ifa_ipv6_policy, extack); 4812 if (err < 0) 4813 return err; 4814 4815 memset(&cfg, 0, sizeof(cfg)); 4816 4817 ifm = nlmsg_data(nlh); 4818 cfg.pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx); 4819 if (!cfg.pfx) 4820 return -EINVAL; 4821 4822 cfg.peer_pfx = peer_pfx; 4823 cfg.plen = ifm->ifa_prefixlen; 4824 if (tb[IFA_RT_PRIORITY]) 4825 cfg.rt_priority = nla_get_u32(tb[IFA_RT_PRIORITY]); 4826 4827 cfg.valid_lft = INFINITY_LIFE_TIME; 4828 cfg.preferred_lft = INFINITY_LIFE_TIME; 4829 4830 if (tb[IFA_CACHEINFO]) { 4831 struct ifa_cacheinfo *ci; 4832 4833 ci = nla_data(tb[IFA_CACHEINFO]); 4834 cfg.valid_lft = ci->ifa_valid; 4835 cfg.preferred_lft = ci->ifa_prefered; 4836 } 4837 4838 dev = __dev_get_by_index(net, ifm->ifa_index); 4839 if (!dev) 4840 return -ENODEV; 4841 4842 if (tb[IFA_FLAGS]) 4843 cfg.ifa_flags = nla_get_u32(tb[IFA_FLAGS]); 4844 else 4845 cfg.ifa_flags = ifm->ifa_flags; 4846 4847 /* We ignore other flags so far. */ 4848 cfg.ifa_flags &= IFA_F_NODAD | IFA_F_HOMEADDRESS | 4849 IFA_F_MANAGETEMPADDR | IFA_F_NOPREFIXROUTE | 4850 IFA_F_MCAUTOJOIN | IFA_F_OPTIMISTIC; 4851 4852 idev = ipv6_find_idev(dev); 4853 if (IS_ERR(idev)) 4854 return PTR_ERR(idev); 4855 4856 if (!ipv6_allow_optimistic_dad(net, idev)) 4857 cfg.ifa_flags &= ~IFA_F_OPTIMISTIC; 4858 4859 if (cfg.ifa_flags & IFA_F_NODAD && 4860 cfg.ifa_flags & IFA_F_OPTIMISTIC) { 4861 NL_SET_ERR_MSG(extack, "IFA_F_NODAD and IFA_F_OPTIMISTIC are mutually exclusive"); 4862 return -EINVAL; 4863 } 4864 4865 ifa = ipv6_get_ifaddr(net, cfg.pfx, dev, 1); 4866 if (!ifa) { 4867 /* 4868 * It would be best to check for !NLM_F_CREATE here but 4869 * userspace already relies on not having to provide this. 4870 */ 4871 return inet6_addr_add(net, ifm->ifa_index, &cfg, extack); 4872 } 4873 4874 if (nlh->nlmsg_flags & NLM_F_EXCL || 4875 !(nlh->nlmsg_flags & NLM_F_REPLACE)) 4876 err = -EEXIST; 4877 else 4878 err = inet6_addr_modify(ifa, &cfg); 4879 4880 in6_ifa_put(ifa); 4881 4882 return err; 4883 } 4884 4885 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u32 flags, 4886 u8 scope, int ifindex) 4887 { 4888 struct ifaddrmsg *ifm; 4889 4890 ifm = nlmsg_data(nlh); 4891 ifm->ifa_family = AF_INET6; 4892 ifm->ifa_prefixlen = prefixlen; 4893 ifm->ifa_flags = flags; 4894 ifm->ifa_scope = scope; 4895 ifm->ifa_index = ifindex; 4896 } 4897 4898 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp, 4899 unsigned long tstamp, u32 preferred, u32 valid) 4900 { 4901 struct ifa_cacheinfo ci; 4902 4903 ci.cstamp = cstamp_delta(cstamp); 4904 ci.tstamp = cstamp_delta(tstamp); 4905 ci.ifa_prefered = preferred; 4906 ci.ifa_valid = valid; 4907 4908 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci); 4909 } 4910 4911 static inline int rt_scope(int ifa_scope) 4912 { 4913 if (ifa_scope & IFA_HOST) 4914 return RT_SCOPE_HOST; 4915 else if (ifa_scope & IFA_LINK) 4916 return RT_SCOPE_LINK; 4917 else if (ifa_scope & IFA_SITE) 4918 return RT_SCOPE_SITE; 4919 else 4920 return RT_SCOPE_UNIVERSE; 4921 } 4922 4923 static inline int inet6_ifaddr_msgsize(void) 4924 { 4925 return NLMSG_ALIGN(sizeof(struct ifaddrmsg)) 4926 + nla_total_size(16) /* IFA_LOCAL */ 4927 + nla_total_size(16) /* IFA_ADDRESS */ 4928 + nla_total_size(sizeof(struct ifa_cacheinfo)) 4929 + nla_total_size(4) /* IFA_FLAGS */ 4930 + nla_total_size(4) /* IFA_RT_PRIORITY */; 4931 } 4932 4933 enum addr_type_t { 4934 UNICAST_ADDR, 4935 MULTICAST_ADDR, 4936 ANYCAST_ADDR, 4937 }; 4938 4939 struct inet6_fill_args { 4940 u32 portid; 4941 u32 seq; 4942 int event; 4943 unsigned int flags; 4944 int netnsid; 4945 int ifindex; 4946 enum addr_type_t type; 4947 }; 4948 4949 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa, 4950 struct inet6_fill_args *args) 4951 { 4952 struct nlmsghdr *nlh; 4953 u32 preferred, valid; 4954 4955 nlh = nlmsg_put(skb, args->portid, args->seq, args->event, 4956 sizeof(struct ifaddrmsg), args->flags); 4957 if (!nlh) 4958 return -EMSGSIZE; 4959 4960 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope), 4961 ifa->idev->dev->ifindex); 4962 4963 if (args->netnsid >= 0 && 4964 nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid)) 4965 goto error; 4966 4967 if (!((ifa->flags&IFA_F_PERMANENT) && 4968 (ifa->prefered_lft == INFINITY_LIFE_TIME))) { 4969 preferred = ifa->prefered_lft; 4970 valid = ifa->valid_lft; 4971 if (preferred != INFINITY_LIFE_TIME) { 4972 long tval = (jiffies - ifa->tstamp)/HZ; 4973 if (preferred > tval) 4974 preferred -= tval; 4975 else 4976 preferred = 0; 4977 if (valid != INFINITY_LIFE_TIME) { 4978 if (valid > tval) 4979 valid -= tval; 4980 else 4981 valid = 0; 4982 } 4983 } 4984 } else { 4985 preferred = INFINITY_LIFE_TIME; 4986 valid = INFINITY_LIFE_TIME; 4987 } 4988 4989 if (!ipv6_addr_any(&ifa->peer_addr)) { 4990 if (nla_put_in6_addr(skb, IFA_LOCAL, &ifa->addr) < 0 || 4991 nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->peer_addr) < 0) 4992 goto error; 4993 } else 4994 if (nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->addr) < 0) 4995 goto error; 4996 4997 if (ifa->rt_priority && 4998 nla_put_u32(skb, IFA_RT_PRIORITY, ifa->rt_priority)) 4999 goto error; 5000 5001 if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) 5002 goto error; 5003 5004 if (nla_put_u32(skb, IFA_FLAGS, ifa->flags) < 0) 5005 goto error; 5006 5007 nlmsg_end(skb, nlh); 5008 return 0; 5009 5010 error: 5011 nlmsg_cancel(skb, nlh); 5012 return -EMSGSIZE; 5013 } 5014 5015 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca, 5016 struct inet6_fill_args *args) 5017 { 5018 struct nlmsghdr *nlh; 5019 u8 scope = RT_SCOPE_UNIVERSE; 5020 int ifindex = ifmca->idev->dev->ifindex; 5021 5022 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE) 5023 scope = RT_SCOPE_SITE; 5024 5025 nlh = nlmsg_put(skb, args->portid, args->seq, args->event, 5026 sizeof(struct ifaddrmsg), args->flags); 5027 if (!nlh) 5028 return -EMSGSIZE; 5029 5030 if (args->netnsid >= 0 && 5031 nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid)) { 5032 nlmsg_cancel(skb, nlh); 5033 return -EMSGSIZE; 5034 } 5035 5036 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 5037 if (nla_put_in6_addr(skb, IFA_MULTICAST, &ifmca->mca_addr) < 0 || 5038 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp, 5039 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 5040 nlmsg_cancel(skb, nlh); 5041 return -EMSGSIZE; 5042 } 5043 5044 nlmsg_end(skb, nlh); 5045 return 0; 5046 } 5047 5048 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca, 5049 struct inet6_fill_args *args) 5050 { 5051 struct net_device *dev = fib6_info_nh_dev(ifaca->aca_rt); 5052 int ifindex = dev ? dev->ifindex : 1; 5053 struct nlmsghdr *nlh; 5054 u8 scope = RT_SCOPE_UNIVERSE; 5055 5056 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE) 5057 scope = RT_SCOPE_SITE; 5058 5059 nlh = nlmsg_put(skb, args->portid, args->seq, args->event, 5060 sizeof(struct ifaddrmsg), args->flags); 5061 if (!nlh) 5062 return -EMSGSIZE; 5063 5064 if (args->netnsid >= 0 && 5065 nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid)) { 5066 nlmsg_cancel(skb, nlh); 5067 return -EMSGSIZE; 5068 } 5069 5070 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 5071 if (nla_put_in6_addr(skb, IFA_ANYCAST, &ifaca->aca_addr) < 0 || 5072 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp, 5073 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 5074 nlmsg_cancel(skb, nlh); 5075 return -EMSGSIZE; 5076 } 5077 5078 nlmsg_end(skb, nlh); 5079 return 0; 5080 } 5081 5082 /* called with rcu_read_lock() */ 5083 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb, 5084 struct netlink_callback *cb, int s_ip_idx, 5085 struct inet6_fill_args *fillargs) 5086 { 5087 struct ifmcaddr6 *ifmca; 5088 struct ifacaddr6 *ifaca; 5089 int ip_idx = 0; 5090 int err = 1; 5091 5092 read_lock_bh(&idev->lock); 5093 switch (fillargs->type) { 5094 case UNICAST_ADDR: { 5095 struct inet6_ifaddr *ifa; 5096 fillargs->event = RTM_NEWADDR; 5097 5098 /* unicast address incl. temp addr */ 5099 list_for_each_entry(ifa, &idev->addr_list, if_list) { 5100 if (ip_idx < s_ip_idx) 5101 goto next; 5102 err = inet6_fill_ifaddr(skb, ifa, fillargs); 5103 if (err < 0) 5104 break; 5105 nl_dump_check_consistent(cb, nlmsg_hdr(skb)); 5106 next: 5107 ip_idx++; 5108 } 5109 break; 5110 } 5111 case MULTICAST_ADDR: 5112 read_unlock_bh(&idev->lock); 5113 fillargs->event = RTM_GETMULTICAST; 5114 5115 /* multicast address */ 5116 for (ifmca = rcu_dereference(idev->mc_list); 5117 ifmca; 5118 ifmca = rcu_dereference(ifmca->next), ip_idx++) { 5119 if (ip_idx < s_ip_idx) 5120 continue; 5121 err = inet6_fill_ifmcaddr(skb, ifmca, fillargs); 5122 if (err < 0) 5123 break; 5124 } 5125 read_lock_bh(&idev->lock); 5126 break; 5127 case ANYCAST_ADDR: 5128 fillargs->event = RTM_GETANYCAST; 5129 /* anycast address */ 5130 for (ifaca = idev->ac_list; ifaca; 5131 ifaca = ifaca->aca_next, ip_idx++) { 5132 if (ip_idx < s_ip_idx) 5133 continue; 5134 err = inet6_fill_ifacaddr(skb, ifaca, fillargs); 5135 if (err < 0) 5136 break; 5137 } 5138 break; 5139 default: 5140 break; 5141 } 5142 read_unlock_bh(&idev->lock); 5143 cb->args[2] = ip_idx; 5144 return err; 5145 } 5146 5147 static int inet6_valid_dump_ifaddr_req(const struct nlmsghdr *nlh, 5148 struct inet6_fill_args *fillargs, 5149 struct net **tgt_net, struct sock *sk, 5150 struct netlink_callback *cb) 5151 { 5152 struct netlink_ext_ack *extack = cb->extack; 5153 struct nlattr *tb[IFA_MAX+1]; 5154 struct ifaddrmsg *ifm; 5155 int err, i; 5156 5157 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) { 5158 NL_SET_ERR_MSG_MOD(extack, "Invalid header for address dump request"); 5159 return -EINVAL; 5160 } 5161 5162 ifm = nlmsg_data(nlh); 5163 if (ifm->ifa_prefixlen || ifm->ifa_flags || ifm->ifa_scope) { 5164 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for address dump request"); 5165 return -EINVAL; 5166 } 5167 5168 fillargs->ifindex = ifm->ifa_index; 5169 if (fillargs->ifindex) { 5170 cb->answer_flags |= NLM_F_DUMP_FILTERED; 5171 fillargs->flags |= NLM_F_DUMP_FILTERED; 5172 } 5173 5174 err = nlmsg_parse_deprecated_strict(nlh, sizeof(*ifm), tb, IFA_MAX, 5175 ifa_ipv6_policy, extack); 5176 if (err < 0) 5177 return err; 5178 5179 for (i = 0; i <= IFA_MAX; ++i) { 5180 if (!tb[i]) 5181 continue; 5182 5183 if (i == IFA_TARGET_NETNSID) { 5184 struct net *net; 5185 5186 fillargs->netnsid = nla_get_s32(tb[i]); 5187 net = rtnl_get_net_ns_capable(sk, fillargs->netnsid); 5188 if (IS_ERR(net)) { 5189 fillargs->netnsid = -1; 5190 NL_SET_ERR_MSG_MOD(extack, "Invalid target network namespace id"); 5191 return PTR_ERR(net); 5192 } 5193 *tgt_net = net; 5194 } else { 5195 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in dump request"); 5196 return -EINVAL; 5197 } 5198 } 5199 5200 return 0; 5201 } 5202 5203 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb, 5204 enum addr_type_t type) 5205 { 5206 const struct nlmsghdr *nlh = cb->nlh; 5207 struct inet6_fill_args fillargs = { 5208 .portid = NETLINK_CB(cb->skb).portid, 5209 .seq = cb->nlh->nlmsg_seq, 5210 .flags = NLM_F_MULTI, 5211 .netnsid = -1, 5212 .type = type, 5213 }; 5214 struct net *net = sock_net(skb->sk); 5215 struct net *tgt_net = net; 5216 int idx, s_idx, s_ip_idx; 5217 int h, s_h; 5218 struct net_device *dev; 5219 struct inet6_dev *idev; 5220 struct hlist_head *head; 5221 int err = 0; 5222 5223 s_h = cb->args[0]; 5224 s_idx = idx = cb->args[1]; 5225 s_ip_idx = cb->args[2]; 5226 5227 if (cb->strict_check) { 5228 err = inet6_valid_dump_ifaddr_req(nlh, &fillargs, &tgt_net, 5229 skb->sk, cb); 5230 if (err < 0) 5231 goto put_tgt_net; 5232 5233 err = 0; 5234 if (fillargs.ifindex) { 5235 dev = __dev_get_by_index(tgt_net, fillargs.ifindex); 5236 if (!dev) { 5237 err = -ENODEV; 5238 goto put_tgt_net; 5239 } 5240 idev = __in6_dev_get(dev); 5241 if (idev) { 5242 err = in6_dump_addrs(idev, skb, cb, s_ip_idx, 5243 &fillargs); 5244 if (err > 0) 5245 err = 0; 5246 } 5247 goto put_tgt_net; 5248 } 5249 } 5250 5251 rcu_read_lock(); 5252 cb->seq = atomic_read(&tgt_net->ipv6.dev_addr_genid) ^ tgt_net->dev_base_seq; 5253 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 5254 idx = 0; 5255 head = &tgt_net->dev_index_head[h]; 5256 hlist_for_each_entry_rcu(dev, head, index_hlist) { 5257 if (idx < s_idx) 5258 goto cont; 5259 if (h > s_h || idx > s_idx) 5260 s_ip_idx = 0; 5261 idev = __in6_dev_get(dev); 5262 if (!idev) 5263 goto cont; 5264 5265 if (in6_dump_addrs(idev, skb, cb, s_ip_idx, 5266 &fillargs) < 0) 5267 goto done; 5268 cont: 5269 idx++; 5270 } 5271 } 5272 done: 5273 rcu_read_unlock(); 5274 cb->args[0] = h; 5275 cb->args[1] = idx; 5276 put_tgt_net: 5277 if (fillargs.netnsid >= 0) 5278 put_net(tgt_net); 5279 5280 return skb->len ? : err; 5281 } 5282 5283 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb) 5284 { 5285 enum addr_type_t type = UNICAST_ADDR; 5286 5287 return inet6_dump_addr(skb, cb, type); 5288 } 5289 5290 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb) 5291 { 5292 enum addr_type_t type = MULTICAST_ADDR; 5293 5294 return inet6_dump_addr(skb, cb, type); 5295 } 5296 5297 5298 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb) 5299 { 5300 enum addr_type_t type = ANYCAST_ADDR; 5301 5302 return inet6_dump_addr(skb, cb, type); 5303 } 5304 5305 static int inet6_rtm_valid_getaddr_req(struct sk_buff *skb, 5306 const struct nlmsghdr *nlh, 5307 struct nlattr **tb, 5308 struct netlink_ext_ack *extack) 5309 { 5310 struct ifaddrmsg *ifm; 5311 int i, err; 5312 5313 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) { 5314 NL_SET_ERR_MSG_MOD(extack, "Invalid header for get address request"); 5315 return -EINVAL; 5316 } 5317 5318 if (!netlink_strict_get_check(skb)) 5319 return nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX, 5320 ifa_ipv6_policy, extack); 5321 5322 ifm = nlmsg_data(nlh); 5323 if (ifm->ifa_prefixlen || ifm->ifa_flags || ifm->ifa_scope) { 5324 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for get address request"); 5325 return -EINVAL; 5326 } 5327 5328 err = nlmsg_parse_deprecated_strict(nlh, sizeof(*ifm), tb, IFA_MAX, 5329 ifa_ipv6_policy, extack); 5330 if (err) 5331 return err; 5332 5333 for (i = 0; i <= IFA_MAX; i++) { 5334 if (!tb[i]) 5335 continue; 5336 5337 switch (i) { 5338 case IFA_TARGET_NETNSID: 5339 case IFA_ADDRESS: 5340 case IFA_LOCAL: 5341 break; 5342 default: 5343 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in get address request"); 5344 return -EINVAL; 5345 } 5346 } 5347 5348 return 0; 5349 } 5350 5351 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh, 5352 struct netlink_ext_ack *extack) 5353 { 5354 struct net *net = sock_net(in_skb->sk); 5355 struct inet6_fill_args fillargs = { 5356 .portid = NETLINK_CB(in_skb).portid, 5357 .seq = nlh->nlmsg_seq, 5358 .event = RTM_NEWADDR, 5359 .flags = 0, 5360 .netnsid = -1, 5361 }; 5362 struct net *tgt_net = net; 5363 struct ifaddrmsg *ifm; 5364 struct nlattr *tb[IFA_MAX+1]; 5365 struct in6_addr *addr = NULL, *peer; 5366 struct net_device *dev = NULL; 5367 struct inet6_ifaddr *ifa; 5368 struct sk_buff *skb; 5369 int err; 5370 5371 err = inet6_rtm_valid_getaddr_req(in_skb, nlh, tb, extack); 5372 if (err < 0) 5373 return err; 5374 5375 if (tb[IFA_TARGET_NETNSID]) { 5376 fillargs.netnsid = nla_get_s32(tb[IFA_TARGET_NETNSID]); 5377 5378 tgt_net = rtnl_get_net_ns_capable(NETLINK_CB(in_skb).sk, 5379 fillargs.netnsid); 5380 if (IS_ERR(tgt_net)) 5381 return PTR_ERR(tgt_net); 5382 } 5383 5384 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer); 5385 if (!addr) 5386 return -EINVAL; 5387 5388 ifm = nlmsg_data(nlh); 5389 if (ifm->ifa_index) 5390 dev = dev_get_by_index(tgt_net, ifm->ifa_index); 5391 5392 ifa = ipv6_get_ifaddr(tgt_net, addr, dev, 1); 5393 if (!ifa) { 5394 err = -EADDRNOTAVAIL; 5395 goto errout; 5396 } 5397 5398 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL); 5399 if (!skb) { 5400 err = -ENOBUFS; 5401 goto errout_ifa; 5402 } 5403 5404 err = inet6_fill_ifaddr(skb, ifa, &fillargs); 5405 if (err < 0) { 5406 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 5407 WARN_ON(err == -EMSGSIZE); 5408 kfree_skb(skb); 5409 goto errout_ifa; 5410 } 5411 err = rtnl_unicast(skb, tgt_net, NETLINK_CB(in_skb).portid); 5412 errout_ifa: 5413 in6_ifa_put(ifa); 5414 errout: 5415 if (dev) 5416 dev_put(dev); 5417 if (fillargs.netnsid >= 0) 5418 put_net(tgt_net); 5419 5420 return err; 5421 } 5422 5423 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa) 5424 { 5425 struct sk_buff *skb; 5426 struct net *net = dev_net(ifa->idev->dev); 5427 struct inet6_fill_args fillargs = { 5428 .portid = 0, 5429 .seq = 0, 5430 .event = event, 5431 .flags = 0, 5432 .netnsid = -1, 5433 }; 5434 int err = -ENOBUFS; 5435 5436 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC); 5437 if (!skb) 5438 goto errout; 5439 5440 err = inet6_fill_ifaddr(skb, ifa, &fillargs); 5441 if (err < 0) { 5442 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 5443 WARN_ON(err == -EMSGSIZE); 5444 kfree_skb(skb); 5445 goto errout; 5446 } 5447 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC); 5448 return; 5449 errout: 5450 if (err < 0) 5451 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err); 5452 } 5453 5454 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf, 5455 __s32 *array, int bytes) 5456 { 5457 BUG_ON(bytes < (DEVCONF_MAX * 4)); 5458 5459 memset(array, 0, bytes); 5460 array[DEVCONF_FORWARDING] = cnf->forwarding; 5461 array[DEVCONF_HOPLIMIT] = cnf->hop_limit; 5462 array[DEVCONF_MTU6] = cnf->mtu6; 5463 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra; 5464 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects; 5465 array[DEVCONF_AUTOCONF] = cnf->autoconf; 5466 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits; 5467 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits; 5468 array[DEVCONF_RTR_SOLICIT_INTERVAL] = 5469 jiffies_to_msecs(cnf->rtr_solicit_interval); 5470 array[DEVCONF_RTR_SOLICIT_MAX_INTERVAL] = 5471 jiffies_to_msecs(cnf->rtr_solicit_max_interval); 5472 array[DEVCONF_RTR_SOLICIT_DELAY] = 5473 jiffies_to_msecs(cnf->rtr_solicit_delay); 5474 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version; 5475 array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] = 5476 jiffies_to_msecs(cnf->mldv1_unsolicited_report_interval); 5477 array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] = 5478 jiffies_to_msecs(cnf->mldv2_unsolicited_report_interval); 5479 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr; 5480 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft; 5481 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft; 5482 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry; 5483 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor; 5484 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses; 5485 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr; 5486 array[DEVCONF_RA_DEFRTR_METRIC] = cnf->ra_defrtr_metric; 5487 array[DEVCONF_ACCEPT_RA_MIN_HOP_LIMIT] = cnf->accept_ra_min_hop_limit; 5488 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo; 5489 #ifdef CONFIG_IPV6_ROUTER_PREF 5490 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref; 5491 array[DEVCONF_RTR_PROBE_INTERVAL] = 5492 jiffies_to_msecs(cnf->rtr_probe_interval); 5493 #ifdef CONFIG_IPV6_ROUTE_INFO 5494 array[DEVCONF_ACCEPT_RA_RT_INFO_MIN_PLEN] = cnf->accept_ra_rt_info_min_plen; 5495 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen; 5496 #endif 5497 #endif 5498 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp; 5499 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route; 5500 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 5501 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad; 5502 array[DEVCONF_USE_OPTIMISTIC] = cnf->use_optimistic; 5503 #endif 5504 #ifdef CONFIG_IPV6_MROUTE 5505 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding; 5506 #endif 5507 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6; 5508 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad; 5509 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao; 5510 array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify; 5511 array[DEVCONF_SUPPRESS_FRAG_NDISC] = cnf->suppress_frag_ndisc; 5512 array[DEVCONF_ACCEPT_RA_FROM_LOCAL] = cnf->accept_ra_from_local; 5513 array[DEVCONF_ACCEPT_RA_MTU] = cnf->accept_ra_mtu; 5514 array[DEVCONF_IGNORE_ROUTES_WITH_LINKDOWN] = cnf->ignore_routes_with_linkdown; 5515 /* we omit DEVCONF_STABLE_SECRET for now */ 5516 array[DEVCONF_USE_OIF_ADDRS_ONLY] = cnf->use_oif_addrs_only; 5517 array[DEVCONF_DROP_UNICAST_IN_L2_MULTICAST] = cnf->drop_unicast_in_l2_multicast; 5518 array[DEVCONF_DROP_UNSOLICITED_NA] = cnf->drop_unsolicited_na; 5519 array[DEVCONF_KEEP_ADDR_ON_DOWN] = cnf->keep_addr_on_down; 5520 array[DEVCONF_SEG6_ENABLED] = cnf->seg6_enabled; 5521 #ifdef CONFIG_IPV6_SEG6_HMAC 5522 array[DEVCONF_SEG6_REQUIRE_HMAC] = cnf->seg6_require_hmac; 5523 #endif 5524 array[DEVCONF_ENHANCED_DAD] = cnf->enhanced_dad; 5525 array[DEVCONF_ADDR_GEN_MODE] = cnf->addr_gen_mode; 5526 array[DEVCONF_DISABLE_POLICY] = cnf->disable_policy; 5527 array[DEVCONF_NDISC_TCLASS] = cnf->ndisc_tclass; 5528 array[DEVCONF_RPL_SEG_ENABLED] = cnf->rpl_seg_enabled; 5529 } 5530 5531 static inline size_t inet6_ifla6_size(void) 5532 { 5533 return nla_total_size(4) /* IFLA_INET6_FLAGS */ 5534 + nla_total_size(sizeof(struct ifla_cacheinfo)) 5535 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */ 5536 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */ 5537 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */ 5538 + nla_total_size(sizeof(struct in6_addr)) /* IFLA_INET6_TOKEN */ 5539 + nla_total_size(1) /* IFLA_INET6_ADDR_GEN_MODE */ 5540 + 0; 5541 } 5542 5543 static inline size_t inet6_if_nlmsg_size(void) 5544 { 5545 return NLMSG_ALIGN(sizeof(struct ifinfomsg)) 5546 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */ 5547 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */ 5548 + nla_total_size(4) /* IFLA_MTU */ 5549 + nla_total_size(4) /* IFLA_LINK */ 5550 + nla_total_size(1) /* IFLA_OPERSTATE */ 5551 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */ 5552 } 5553 5554 static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib, 5555 int bytes) 5556 { 5557 int i; 5558 int pad = bytes - sizeof(u64) * ICMP6_MIB_MAX; 5559 BUG_ON(pad < 0); 5560 5561 /* Use put_unaligned() because stats may not be aligned for u64. */ 5562 put_unaligned(ICMP6_MIB_MAX, &stats[0]); 5563 for (i = 1; i < ICMP6_MIB_MAX; i++) 5564 put_unaligned(atomic_long_read(&mib[i]), &stats[i]); 5565 5566 memset(&stats[ICMP6_MIB_MAX], 0, pad); 5567 } 5568 5569 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu *mib, 5570 int bytes, size_t syncpoff) 5571 { 5572 int i, c; 5573 u64 buff[IPSTATS_MIB_MAX]; 5574 int pad = bytes - sizeof(u64) * IPSTATS_MIB_MAX; 5575 5576 BUG_ON(pad < 0); 5577 5578 memset(buff, 0, sizeof(buff)); 5579 buff[0] = IPSTATS_MIB_MAX; 5580 5581 for_each_possible_cpu(c) { 5582 for (i = 1; i < IPSTATS_MIB_MAX; i++) 5583 buff[i] += snmp_get_cpu_field64(mib, c, i, syncpoff); 5584 } 5585 5586 memcpy(stats, buff, IPSTATS_MIB_MAX * sizeof(u64)); 5587 memset(&stats[IPSTATS_MIB_MAX], 0, pad); 5588 } 5589 5590 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype, 5591 int bytes) 5592 { 5593 switch (attrtype) { 5594 case IFLA_INET6_STATS: 5595 __snmp6_fill_stats64(stats, idev->stats.ipv6, bytes, 5596 offsetof(struct ipstats_mib, syncp)); 5597 break; 5598 case IFLA_INET6_ICMP6STATS: 5599 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, bytes); 5600 break; 5601 } 5602 } 5603 5604 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev, 5605 u32 ext_filter_mask) 5606 { 5607 struct nlattr *nla; 5608 struct ifla_cacheinfo ci; 5609 5610 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags)) 5611 goto nla_put_failure; 5612 ci.max_reasm_len = IPV6_MAXPLEN; 5613 ci.tstamp = cstamp_delta(idev->tstamp); 5614 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time); 5615 ci.retrans_time = jiffies_to_msecs(NEIGH_VAR(idev->nd_parms, RETRANS_TIME)); 5616 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci)) 5617 goto nla_put_failure; 5618 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32)); 5619 if (!nla) 5620 goto nla_put_failure; 5621 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla)); 5622 5623 /* XXX - MC not implemented */ 5624 5625 if (ext_filter_mask & RTEXT_FILTER_SKIP_STATS) 5626 return 0; 5627 5628 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64)); 5629 if (!nla) 5630 goto nla_put_failure; 5631 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla)); 5632 5633 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64)); 5634 if (!nla) 5635 goto nla_put_failure; 5636 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla)); 5637 5638 nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr)); 5639 if (!nla) 5640 goto nla_put_failure; 5641 read_lock_bh(&idev->lock); 5642 memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla)); 5643 read_unlock_bh(&idev->lock); 5644 5645 if (nla_put_u8(skb, IFLA_INET6_ADDR_GEN_MODE, idev->cnf.addr_gen_mode)) 5646 goto nla_put_failure; 5647 5648 return 0; 5649 5650 nla_put_failure: 5651 return -EMSGSIZE; 5652 } 5653 5654 static size_t inet6_get_link_af_size(const struct net_device *dev, 5655 u32 ext_filter_mask) 5656 { 5657 if (!__in6_dev_get(dev)) 5658 return 0; 5659 5660 return inet6_ifla6_size(); 5661 } 5662 5663 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev, 5664 u32 ext_filter_mask) 5665 { 5666 struct inet6_dev *idev = __in6_dev_get(dev); 5667 5668 if (!idev) 5669 return -ENODATA; 5670 5671 if (inet6_fill_ifla6_attrs(skb, idev, ext_filter_mask) < 0) 5672 return -EMSGSIZE; 5673 5674 return 0; 5675 } 5676 5677 static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token, 5678 struct netlink_ext_ack *extack) 5679 { 5680 struct inet6_ifaddr *ifp; 5681 struct net_device *dev = idev->dev; 5682 bool clear_token, update_rs = false; 5683 struct in6_addr ll_addr; 5684 5685 ASSERT_RTNL(); 5686 5687 if (!token) 5688 return -EINVAL; 5689 5690 if (dev->flags & IFF_LOOPBACK) { 5691 NL_SET_ERR_MSG_MOD(extack, "Device is loopback"); 5692 return -EINVAL; 5693 } 5694 5695 if (dev->flags & IFF_NOARP) { 5696 NL_SET_ERR_MSG_MOD(extack, 5697 "Device does not do neighbour discovery"); 5698 return -EINVAL; 5699 } 5700 5701 if (!ipv6_accept_ra(idev)) { 5702 NL_SET_ERR_MSG_MOD(extack, 5703 "Router advertisement is disabled on device"); 5704 return -EINVAL; 5705 } 5706 5707 if (idev->cnf.rtr_solicits == 0) { 5708 NL_SET_ERR_MSG(extack, 5709 "Router solicitation is disabled on device"); 5710 return -EINVAL; 5711 } 5712 5713 write_lock_bh(&idev->lock); 5714 5715 BUILD_BUG_ON(sizeof(token->s6_addr) != 16); 5716 memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8); 5717 5718 write_unlock_bh(&idev->lock); 5719 5720 clear_token = ipv6_addr_any(token); 5721 if (clear_token) 5722 goto update_lft; 5723 5724 if (!idev->dead && (idev->if_flags & IF_READY) && 5725 !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE | 5726 IFA_F_OPTIMISTIC)) { 5727 /* If we're not ready, then normal ifup will take care 5728 * of this. Otherwise, we need to request our rs here. 5729 */ 5730 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters); 5731 update_rs = true; 5732 } 5733 5734 update_lft: 5735 write_lock_bh(&idev->lock); 5736 5737 if (update_rs) { 5738 idev->if_flags |= IF_RS_SENT; 5739 idev->rs_interval = rfc3315_s14_backoff_init( 5740 idev->cnf.rtr_solicit_interval); 5741 idev->rs_probes = 1; 5742 addrconf_mod_rs_timer(idev, idev->rs_interval); 5743 } 5744 5745 /* Well, that's kinda nasty ... */ 5746 list_for_each_entry(ifp, &idev->addr_list, if_list) { 5747 spin_lock(&ifp->lock); 5748 if (ifp->tokenized) { 5749 ifp->valid_lft = 0; 5750 ifp->prefered_lft = 0; 5751 } 5752 spin_unlock(&ifp->lock); 5753 } 5754 5755 write_unlock_bh(&idev->lock); 5756 inet6_ifinfo_notify(RTM_NEWLINK, idev); 5757 addrconf_verify_rtnl(); 5758 return 0; 5759 } 5760 5761 static const struct nla_policy inet6_af_policy[IFLA_INET6_MAX + 1] = { 5762 [IFLA_INET6_ADDR_GEN_MODE] = { .type = NLA_U8 }, 5763 [IFLA_INET6_TOKEN] = { .len = sizeof(struct in6_addr) }, 5764 }; 5765 5766 static int check_addr_gen_mode(int mode) 5767 { 5768 if (mode != IN6_ADDR_GEN_MODE_EUI64 && 5769 mode != IN6_ADDR_GEN_MODE_NONE && 5770 mode != IN6_ADDR_GEN_MODE_STABLE_PRIVACY && 5771 mode != IN6_ADDR_GEN_MODE_RANDOM) 5772 return -EINVAL; 5773 return 1; 5774 } 5775 5776 static int check_stable_privacy(struct inet6_dev *idev, struct net *net, 5777 int mode) 5778 { 5779 if (mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY && 5780 !idev->cnf.stable_secret.initialized && 5781 !net->ipv6.devconf_dflt->stable_secret.initialized) 5782 return -EINVAL; 5783 return 1; 5784 } 5785 5786 static int inet6_validate_link_af(const struct net_device *dev, 5787 const struct nlattr *nla) 5788 { 5789 struct nlattr *tb[IFLA_INET6_MAX + 1]; 5790 struct inet6_dev *idev = NULL; 5791 int err; 5792 5793 if (dev) { 5794 idev = __in6_dev_get(dev); 5795 if (!idev) 5796 return -EAFNOSUPPORT; 5797 } 5798 5799 err = nla_parse_nested_deprecated(tb, IFLA_INET6_MAX, nla, 5800 inet6_af_policy, NULL); 5801 if (err) 5802 return err; 5803 5804 if (!tb[IFLA_INET6_TOKEN] && !tb[IFLA_INET6_ADDR_GEN_MODE]) 5805 return -EINVAL; 5806 5807 if (tb[IFLA_INET6_ADDR_GEN_MODE]) { 5808 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]); 5809 5810 if (check_addr_gen_mode(mode) < 0) 5811 return -EINVAL; 5812 if (dev && check_stable_privacy(idev, dev_net(dev), mode) < 0) 5813 return -EINVAL; 5814 } 5815 5816 return 0; 5817 } 5818 5819 static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla, 5820 struct netlink_ext_ack *extack) 5821 { 5822 struct inet6_dev *idev = __in6_dev_get(dev); 5823 struct nlattr *tb[IFLA_INET6_MAX + 1]; 5824 int err; 5825 5826 if (!idev) 5827 return -EAFNOSUPPORT; 5828 5829 if (nla_parse_nested_deprecated(tb, IFLA_INET6_MAX, nla, NULL, NULL) < 0) 5830 BUG(); 5831 5832 if (tb[IFLA_INET6_TOKEN]) { 5833 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN]), 5834 extack); 5835 if (err) 5836 return err; 5837 } 5838 5839 if (tb[IFLA_INET6_ADDR_GEN_MODE]) { 5840 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]); 5841 5842 idev->cnf.addr_gen_mode = mode; 5843 } 5844 5845 return 0; 5846 } 5847 5848 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev, 5849 u32 portid, u32 seq, int event, unsigned int flags) 5850 { 5851 struct net_device *dev = idev->dev; 5852 struct ifinfomsg *hdr; 5853 struct nlmsghdr *nlh; 5854 void *protoinfo; 5855 5856 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags); 5857 if (!nlh) 5858 return -EMSGSIZE; 5859 5860 hdr = nlmsg_data(nlh); 5861 hdr->ifi_family = AF_INET6; 5862 hdr->__ifi_pad = 0; 5863 hdr->ifi_type = dev->type; 5864 hdr->ifi_index = dev->ifindex; 5865 hdr->ifi_flags = dev_get_flags(dev); 5866 hdr->ifi_change = 0; 5867 5868 if (nla_put_string(skb, IFLA_IFNAME, dev->name) || 5869 (dev->addr_len && 5870 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) || 5871 nla_put_u32(skb, IFLA_MTU, dev->mtu) || 5872 (dev->ifindex != dev_get_iflink(dev) && 5873 nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))) || 5874 nla_put_u8(skb, IFLA_OPERSTATE, 5875 netif_running(dev) ? dev->operstate : IF_OPER_DOWN)) 5876 goto nla_put_failure; 5877 protoinfo = nla_nest_start_noflag(skb, IFLA_PROTINFO); 5878 if (!protoinfo) 5879 goto nla_put_failure; 5880 5881 if (inet6_fill_ifla6_attrs(skb, idev, 0) < 0) 5882 goto nla_put_failure; 5883 5884 nla_nest_end(skb, protoinfo); 5885 nlmsg_end(skb, nlh); 5886 return 0; 5887 5888 nla_put_failure: 5889 nlmsg_cancel(skb, nlh); 5890 return -EMSGSIZE; 5891 } 5892 5893 static int inet6_valid_dump_ifinfo(const struct nlmsghdr *nlh, 5894 struct netlink_ext_ack *extack) 5895 { 5896 struct ifinfomsg *ifm; 5897 5898 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) { 5899 NL_SET_ERR_MSG_MOD(extack, "Invalid header for link dump request"); 5900 return -EINVAL; 5901 } 5902 5903 if (nlmsg_attrlen(nlh, sizeof(*ifm))) { 5904 NL_SET_ERR_MSG_MOD(extack, "Invalid data after header"); 5905 return -EINVAL; 5906 } 5907 5908 ifm = nlmsg_data(nlh); 5909 if (ifm->__ifi_pad || ifm->ifi_type || ifm->ifi_flags || 5910 ifm->ifi_change || ifm->ifi_index) { 5911 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for dump request"); 5912 return -EINVAL; 5913 } 5914 5915 return 0; 5916 } 5917 5918 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb) 5919 { 5920 struct net *net = sock_net(skb->sk); 5921 int h, s_h; 5922 int idx = 0, s_idx; 5923 struct net_device *dev; 5924 struct inet6_dev *idev; 5925 struct hlist_head *head; 5926 5927 /* only requests using strict checking can pass data to 5928 * influence the dump 5929 */ 5930 if (cb->strict_check) { 5931 int err = inet6_valid_dump_ifinfo(cb->nlh, cb->extack); 5932 5933 if (err < 0) 5934 return err; 5935 } 5936 5937 s_h = cb->args[0]; 5938 s_idx = cb->args[1]; 5939 5940 rcu_read_lock(); 5941 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 5942 idx = 0; 5943 head = &net->dev_index_head[h]; 5944 hlist_for_each_entry_rcu(dev, head, index_hlist) { 5945 if (idx < s_idx) 5946 goto cont; 5947 idev = __in6_dev_get(dev); 5948 if (!idev) 5949 goto cont; 5950 if (inet6_fill_ifinfo(skb, idev, 5951 NETLINK_CB(cb->skb).portid, 5952 cb->nlh->nlmsg_seq, 5953 RTM_NEWLINK, NLM_F_MULTI) < 0) 5954 goto out; 5955 cont: 5956 idx++; 5957 } 5958 } 5959 out: 5960 rcu_read_unlock(); 5961 cb->args[1] = idx; 5962 cb->args[0] = h; 5963 5964 return skb->len; 5965 } 5966 5967 void inet6_ifinfo_notify(int event, struct inet6_dev *idev) 5968 { 5969 struct sk_buff *skb; 5970 struct net *net = dev_net(idev->dev); 5971 int err = -ENOBUFS; 5972 5973 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC); 5974 if (!skb) 5975 goto errout; 5976 5977 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0); 5978 if (err < 0) { 5979 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */ 5980 WARN_ON(err == -EMSGSIZE); 5981 kfree_skb(skb); 5982 goto errout; 5983 } 5984 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC); 5985 return; 5986 errout: 5987 if (err < 0) 5988 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err); 5989 } 5990 5991 static inline size_t inet6_prefix_nlmsg_size(void) 5992 { 5993 return NLMSG_ALIGN(sizeof(struct prefixmsg)) 5994 + nla_total_size(sizeof(struct in6_addr)) 5995 + nla_total_size(sizeof(struct prefix_cacheinfo)); 5996 } 5997 5998 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev, 5999 struct prefix_info *pinfo, u32 portid, u32 seq, 6000 int event, unsigned int flags) 6001 { 6002 struct prefixmsg *pmsg; 6003 struct nlmsghdr *nlh; 6004 struct prefix_cacheinfo ci; 6005 6006 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags); 6007 if (!nlh) 6008 return -EMSGSIZE; 6009 6010 pmsg = nlmsg_data(nlh); 6011 pmsg->prefix_family = AF_INET6; 6012 pmsg->prefix_pad1 = 0; 6013 pmsg->prefix_pad2 = 0; 6014 pmsg->prefix_ifindex = idev->dev->ifindex; 6015 pmsg->prefix_len = pinfo->prefix_len; 6016 pmsg->prefix_type = pinfo->type; 6017 pmsg->prefix_pad3 = 0; 6018 pmsg->prefix_flags = 0; 6019 if (pinfo->onlink) 6020 pmsg->prefix_flags |= IF_PREFIX_ONLINK; 6021 if (pinfo->autoconf) 6022 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF; 6023 6024 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix)) 6025 goto nla_put_failure; 6026 ci.preferred_time = ntohl(pinfo->prefered); 6027 ci.valid_time = ntohl(pinfo->valid); 6028 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci)) 6029 goto nla_put_failure; 6030 nlmsg_end(skb, nlh); 6031 return 0; 6032 6033 nla_put_failure: 6034 nlmsg_cancel(skb, nlh); 6035 return -EMSGSIZE; 6036 } 6037 6038 static void inet6_prefix_notify(int event, struct inet6_dev *idev, 6039 struct prefix_info *pinfo) 6040 { 6041 struct sk_buff *skb; 6042 struct net *net = dev_net(idev->dev); 6043 int err = -ENOBUFS; 6044 6045 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC); 6046 if (!skb) 6047 goto errout; 6048 6049 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0); 6050 if (err < 0) { 6051 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */ 6052 WARN_ON(err == -EMSGSIZE); 6053 kfree_skb(skb); 6054 goto errout; 6055 } 6056 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC); 6057 return; 6058 errout: 6059 if (err < 0) 6060 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err); 6061 } 6062 6063 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 6064 { 6065 struct net *net = dev_net(ifp->idev->dev); 6066 6067 if (event) 6068 ASSERT_RTNL(); 6069 6070 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp); 6071 6072 switch (event) { 6073 case RTM_NEWADDR: 6074 /* 6075 * If the address was optimistic we inserted the route at the 6076 * start of our DAD process, so we don't need to do it again. 6077 * If the device was taken down in the middle of the DAD 6078 * cycle there is a race where we could get here without a 6079 * host route, so nothing to insert. That will be fixed when 6080 * the device is brought up. 6081 */ 6082 if (ifp->rt && !rcu_access_pointer(ifp->rt->fib6_node)) { 6083 ip6_ins_rt(net, ifp->rt); 6084 } else if (!ifp->rt && (ifp->idev->dev->flags & IFF_UP)) { 6085 pr_warn("BUG: Address %pI6c on device %s is missing its host route.\n", 6086 &ifp->addr, ifp->idev->dev->name); 6087 } 6088 6089 if (ifp->idev->cnf.forwarding) 6090 addrconf_join_anycast(ifp); 6091 if (!ipv6_addr_any(&ifp->peer_addr)) 6092 addrconf_prefix_route(&ifp->peer_addr, 128, 6093 ifp->rt_priority, ifp->idev->dev, 6094 0, 0, GFP_ATOMIC); 6095 break; 6096 case RTM_DELADDR: 6097 if (ifp->idev->cnf.forwarding) 6098 addrconf_leave_anycast(ifp); 6099 addrconf_leave_solict(ifp->idev, &ifp->addr); 6100 if (!ipv6_addr_any(&ifp->peer_addr)) { 6101 struct fib6_info *rt; 6102 6103 rt = addrconf_get_prefix_route(&ifp->peer_addr, 128, 6104 ifp->idev->dev, 0, 0, 6105 false); 6106 if (rt) 6107 ip6_del_rt(net, rt, false); 6108 } 6109 if (ifp->rt) { 6110 ip6_del_rt(net, ifp->rt, false); 6111 ifp->rt = NULL; 6112 } 6113 rt_genid_bump_ipv6(net); 6114 break; 6115 } 6116 atomic_inc(&net->ipv6.dev_addr_genid); 6117 } 6118 6119 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 6120 { 6121 if (likely(ifp->idev->dead == 0)) 6122 __ipv6_ifa_notify(event, ifp); 6123 } 6124 6125 #ifdef CONFIG_SYSCTL 6126 6127 static int addrconf_sysctl_forward(struct ctl_table *ctl, int write, 6128 void *buffer, size_t *lenp, loff_t *ppos) 6129 { 6130 int *valp = ctl->data; 6131 int val = *valp; 6132 loff_t pos = *ppos; 6133 struct ctl_table lctl; 6134 int ret; 6135 6136 /* 6137 * ctl->data points to idev->cnf.forwarding, we should 6138 * not modify it until we get the rtnl lock. 6139 */ 6140 lctl = *ctl; 6141 lctl.data = &val; 6142 6143 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 6144 6145 if (write) 6146 ret = addrconf_fixup_forwarding(ctl, valp, val); 6147 if (ret) 6148 *ppos = pos; 6149 return ret; 6150 } 6151 6152 static int addrconf_sysctl_mtu(struct ctl_table *ctl, int write, 6153 void *buffer, size_t *lenp, loff_t *ppos) 6154 { 6155 struct inet6_dev *idev = ctl->extra1; 6156 int min_mtu = IPV6_MIN_MTU; 6157 struct ctl_table lctl; 6158 6159 lctl = *ctl; 6160 lctl.extra1 = &min_mtu; 6161 lctl.extra2 = idev ? &idev->dev->mtu : NULL; 6162 6163 return proc_dointvec_minmax(&lctl, write, buffer, lenp, ppos); 6164 } 6165 6166 static void dev_disable_change(struct inet6_dev *idev) 6167 { 6168 struct netdev_notifier_info info; 6169 6170 if (!idev || !idev->dev) 6171 return; 6172 6173 netdev_notifier_info_init(&info, idev->dev); 6174 if (idev->cnf.disable_ipv6) 6175 addrconf_notify(NULL, NETDEV_DOWN, &info); 6176 else 6177 addrconf_notify(NULL, NETDEV_UP, &info); 6178 } 6179 6180 static void addrconf_disable_change(struct net *net, __s32 newf) 6181 { 6182 struct net_device *dev; 6183 struct inet6_dev *idev; 6184 6185 for_each_netdev(net, dev) { 6186 idev = __in6_dev_get(dev); 6187 if (idev) { 6188 int changed = (!idev->cnf.disable_ipv6) ^ (!newf); 6189 idev->cnf.disable_ipv6 = newf; 6190 if (changed) 6191 dev_disable_change(idev); 6192 } 6193 } 6194 } 6195 6196 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf) 6197 { 6198 struct net *net; 6199 int old; 6200 6201 if (!rtnl_trylock()) 6202 return restart_syscall(); 6203 6204 net = (struct net *)table->extra2; 6205 old = *p; 6206 *p = newf; 6207 6208 if (p == &net->ipv6.devconf_dflt->disable_ipv6) { 6209 rtnl_unlock(); 6210 return 0; 6211 } 6212 6213 if (p == &net->ipv6.devconf_all->disable_ipv6) { 6214 net->ipv6.devconf_dflt->disable_ipv6 = newf; 6215 addrconf_disable_change(net, newf); 6216 } else if ((!newf) ^ (!old)) 6217 dev_disable_change((struct inet6_dev *)table->extra1); 6218 6219 rtnl_unlock(); 6220 return 0; 6221 } 6222 6223 static int addrconf_sysctl_disable(struct ctl_table *ctl, int write, 6224 void *buffer, size_t *lenp, loff_t *ppos) 6225 { 6226 int *valp = ctl->data; 6227 int val = *valp; 6228 loff_t pos = *ppos; 6229 struct ctl_table lctl; 6230 int ret; 6231 6232 /* 6233 * ctl->data points to idev->cnf.disable_ipv6, we should 6234 * not modify it until we get the rtnl lock. 6235 */ 6236 lctl = *ctl; 6237 lctl.data = &val; 6238 6239 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 6240 6241 if (write) 6242 ret = addrconf_disable_ipv6(ctl, valp, val); 6243 if (ret) 6244 *ppos = pos; 6245 return ret; 6246 } 6247 6248 static int addrconf_sysctl_proxy_ndp(struct ctl_table *ctl, int write, 6249 void *buffer, size_t *lenp, loff_t *ppos) 6250 { 6251 int *valp = ctl->data; 6252 int ret; 6253 int old, new; 6254 6255 old = *valp; 6256 ret = proc_dointvec(ctl, write, buffer, lenp, ppos); 6257 new = *valp; 6258 6259 if (write && old != new) { 6260 struct net *net = ctl->extra2; 6261 6262 if (!rtnl_trylock()) 6263 return restart_syscall(); 6264 6265 if (valp == &net->ipv6.devconf_dflt->proxy_ndp) 6266 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 6267 NETCONFA_PROXY_NEIGH, 6268 NETCONFA_IFINDEX_DEFAULT, 6269 net->ipv6.devconf_dflt); 6270 else if (valp == &net->ipv6.devconf_all->proxy_ndp) 6271 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 6272 NETCONFA_PROXY_NEIGH, 6273 NETCONFA_IFINDEX_ALL, 6274 net->ipv6.devconf_all); 6275 else { 6276 struct inet6_dev *idev = ctl->extra1; 6277 6278 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 6279 NETCONFA_PROXY_NEIGH, 6280 idev->dev->ifindex, 6281 &idev->cnf); 6282 } 6283 rtnl_unlock(); 6284 } 6285 6286 return ret; 6287 } 6288 6289 static int addrconf_sysctl_addr_gen_mode(struct ctl_table *ctl, int write, 6290 void *buffer, size_t *lenp, 6291 loff_t *ppos) 6292 { 6293 int ret = 0; 6294 u32 new_val; 6295 struct inet6_dev *idev = (struct inet6_dev *)ctl->extra1; 6296 struct net *net = (struct net *)ctl->extra2; 6297 struct ctl_table tmp = { 6298 .data = &new_val, 6299 .maxlen = sizeof(new_val), 6300 .mode = ctl->mode, 6301 }; 6302 6303 if (!rtnl_trylock()) 6304 return restart_syscall(); 6305 6306 new_val = *((u32 *)ctl->data); 6307 6308 ret = proc_douintvec(&tmp, write, buffer, lenp, ppos); 6309 if (ret != 0) 6310 goto out; 6311 6312 if (write) { 6313 if (check_addr_gen_mode(new_val) < 0) { 6314 ret = -EINVAL; 6315 goto out; 6316 } 6317 6318 if (idev) { 6319 if (check_stable_privacy(idev, net, new_val) < 0) { 6320 ret = -EINVAL; 6321 goto out; 6322 } 6323 6324 if (idev->cnf.addr_gen_mode != new_val) { 6325 idev->cnf.addr_gen_mode = new_val; 6326 addrconf_dev_config(idev->dev); 6327 } 6328 } else if (&net->ipv6.devconf_all->addr_gen_mode == ctl->data) { 6329 struct net_device *dev; 6330 6331 net->ipv6.devconf_dflt->addr_gen_mode = new_val; 6332 for_each_netdev(net, dev) { 6333 idev = __in6_dev_get(dev); 6334 if (idev && 6335 idev->cnf.addr_gen_mode != new_val) { 6336 idev->cnf.addr_gen_mode = new_val; 6337 addrconf_dev_config(idev->dev); 6338 } 6339 } 6340 } 6341 6342 *((u32 *)ctl->data) = new_val; 6343 } 6344 6345 out: 6346 rtnl_unlock(); 6347 6348 return ret; 6349 } 6350 6351 static int addrconf_sysctl_stable_secret(struct ctl_table *ctl, int write, 6352 void *buffer, size_t *lenp, 6353 loff_t *ppos) 6354 { 6355 int err; 6356 struct in6_addr addr; 6357 char str[IPV6_MAX_STRLEN]; 6358 struct ctl_table lctl = *ctl; 6359 struct net *net = ctl->extra2; 6360 struct ipv6_stable_secret *secret = ctl->data; 6361 6362 if (&net->ipv6.devconf_all->stable_secret == ctl->data) 6363 return -EIO; 6364 6365 lctl.maxlen = IPV6_MAX_STRLEN; 6366 lctl.data = str; 6367 6368 if (!rtnl_trylock()) 6369 return restart_syscall(); 6370 6371 if (!write && !secret->initialized) { 6372 err = -EIO; 6373 goto out; 6374 } 6375 6376 err = snprintf(str, sizeof(str), "%pI6", &secret->secret); 6377 if (err >= sizeof(str)) { 6378 err = -EIO; 6379 goto out; 6380 } 6381 6382 err = proc_dostring(&lctl, write, buffer, lenp, ppos); 6383 if (err || !write) 6384 goto out; 6385 6386 if (in6_pton(str, -1, addr.in6_u.u6_addr8, -1, NULL) != 1) { 6387 err = -EIO; 6388 goto out; 6389 } 6390 6391 secret->initialized = true; 6392 secret->secret = addr; 6393 6394 if (&net->ipv6.devconf_dflt->stable_secret == ctl->data) { 6395 struct net_device *dev; 6396 6397 for_each_netdev(net, dev) { 6398 struct inet6_dev *idev = __in6_dev_get(dev); 6399 6400 if (idev) { 6401 idev->cnf.addr_gen_mode = 6402 IN6_ADDR_GEN_MODE_STABLE_PRIVACY; 6403 } 6404 } 6405 } else { 6406 struct inet6_dev *idev = ctl->extra1; 6407 6408 idev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY; 6409 } 6410 6411 out: 6412 rtnl_unlock(); 6413 6414 return err; 6415 } 6416 6417 static 6418 int addrconf_sysctl_ignore_routes_with_linkdown(struct ctl_table *ctl, 6419 int write, void *buffer, 6420 size_t *lenp, 6421 loff_t *ppos) 6422 { 6423 int *valp = ctl->data; 6424 int val = *valp; 6425 loff_t pos = *ppos; 6426 struct ctl_table lctl; 6427 int ret; 6428 6429 /* ctl->data points to idev->cnf.ignore_routes_when_linkdown 6430 * we should not modify it until we get the rtnl lock. 6431 */ 6432 lctl = *ctl; 6433 lctl.data = &val; 6434 6435 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 6436 6437 if (write) 6438 ret = addrconf_fixup_linkdown(ctl, valp, val); 6439 if (ret) 6440 *ppos = pos; 6441 return ret; 6442 } 6443 6444 static 6445 void addrconf_set_nopolicy(struct rt6_info *rt, int action) 6446 { 6447 if (rt) { 6448 if (action) 6449 rt->dst.flags |= DST_NOPOLICY; 6450 else 6451 rt->dst.flags &= ~DST_NOPOLICY; 6452 } 6453 } 6454 6455 static 6456 void addrconf_disable_policy_idev(struct inet6_dev *idev, int val) 6457 { 6458 struct inet6_ifaddr *ifa; 6459 6460 read_lock_bh(&idev->lock); 6461 list_for_each_entry(ifa, &idev->addr_list, if_list) { 6462 spin_lock(&ifa->lock); 6463 if (ifa->rt) { 6464 /* host routes only use builtin fib6_nh */ 6465 struct fib6_nh *nh = ifa->rt->fib6_nh; 6466 int cpu; 6467 6468 rcu_read_lock(); 6469 ifa->rt->dst_nopolicy = val ? true : false; 6470 if (nh->rt6i_pcpu) { 6471 for_each_possible_cpu(cpu) { 6472 struct rt6_info **rtp; 6473 6474 rtp = per_cpu_ptr(nh->rt6i_pcpu, cpu); 6475 addrconf_set_nopolicy(*rtp, val); 6476 } 6477 } 6478 rcu_read_unlock(); 6479 } 6480 spin_unlock(&ifa->lock); 6481 } 6482 read_unlock_bh(&idev->lock); 6483 } 6484 6485 static 6486 int addrconf_disable_policy(struct ctl_table *ctl, int *valp, int val) 6487 { 6488 struct inet6_dev *idev; 6489 struct net *net; 6490 6491 if (!rtnl_trylock()) 6492 return restart_syscall(); 6493 6494 *valp = val; 6495 6496 net = (struct net *)ctl->extra2; 6497 if (valp == &net->ipv6.devconf_dflt->disable_policy) { 6498 rtnl_unlock(); 6499 return 0; 6500 } 6501 6502 if (valp == &net->ipv6.devconf_all->disable_policy) { 6503 struct net_device *dev; 6504 6505 for_each_netdev(net, dev) { 6506 idev = __in6_dev_get(dev); 6507 if (idev) 6508 addrconf_disable_policy_idev(idev, val); 6509 } 6510 } else { 6511 idev = (struct inet6_dev *)ctl->extra1; 6512 addrconf_disable_policy_idev(idev, val); 6513 } 6514 6515 rtnl_unlock(); 6516 return 0; 6517 } 6518 6519 static int addrconf_sysctl_disable_policy(struct ctl_table *ctl, int write, 6520 void *buffer, size_t *lenp, loff_t *ppos) 6521 { 6522 int *valp = ctl->data; 6523 int val = *valp; 6524 loff_t pos = *ppos; 6525 struct ctl_table lctl; 6526 int ret; 6527 6528 lctl = *ctl; 6529 lctl.data = &val; 6530 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 6531 6532 if (write && (*valp != val)) 6533 ret = addrconf_disable_policy(ctl, valp, val); 6534 6535 if (ret) 6536 *ppos = pos; 6537 6538 return ret; 6539 } 6540 6541 static int minus_one = -1; 6542 static const int two_five_five = 255; 6543 6544 static const struct ctl_table addrconf_sysctl[] = { 6545 { 6546 .procname = "forwarding", 6547 .data = &ipv6_devconf.forwarding, 6548 .maxlen = sizeof(int), 6549 .mode = 0644, 6550 .proc_handler = addrconf_sysctl_forward, 6551 }, 6552 { 6553 .procname = "hop_limit", 6554 .data = &ipv6_devconf.hop_limit, 6555 .maxlen = sizeof(int), 6556 .mode = 0644, 6557 .proc_handler = proc_dointvec_minmax, 6558 .extra1 = (void *)SYSCTL_ONE, 6559 .extra2 = (void *)&two_five_five, 6560 }, 6561 { 6562 .procname = "mtu", 6563 .data = &ipv6_devconf.mtu6, 6564 .maxlen = sizeof(int), 6565 .mode = 0644, 6566 .proc_handler = addrconf_sysctl_mtu, 6567 }, 6568 { 6569 .procname = "accept_ra", 6570 .data = &ipv6_devconf.accept_ra, 6571 .maxlen = sizeof(int), 6572 .mode = 0644, 6573 .proc_handler = proc_dointvec, 6574 }, 6575 { 6576 .procname = "accept_redirects", 6577 .data = &ipv6_devconf.accept_redirects, 6578 .maxlen = sizeof(int), 6579 .mode = 0644, 6580 .proc_handler = proc_dointvec, 6581 }, 6582 { 6583 .procname = "autoconf", 6584 .data = &ipv6_devconf.autoconf, 6585 .maxlen = sizeof(int), 6586 .mode = 0644, 6587 .proc_handler = proc_dointvec, 6588 }, 6589 { 6590 .procname = "dad_transmits", 6591 .data = &ipv6_devconf.dad_transmits, 6592 .maxlen = sizeof(int), 6593 .mode = 0644, 6594 .proc_handler = proc_dointvec, 6595 }, 6596 { 6597 .procname = "router_solicitations", 6598 .data = &ipv6_devconf.rtr_solicits, 6599 .maxlen = sizeof(int), 6600 .mode = 0644, 6601 .proc_handler = proc_dointvec_minmax, 6602 .extra1 = &minus_one, 6603 }, 6604 { 6605 .procname = "router_solicitation_interval", 6606 .data = &ipv6_devconf.rtr_solicit_interval, 6607 .maxlen = sizeof(int), 6608 .mode = 0644, 6609 .proc_handler = proc_dointvec_jiffies, 6610 }, 6611 { 6612 .procname = "router_solicitation_max_interval", 6613 .data = &ipv6_devconf.rtr_solicit_max_interval, 6614 .maxlen = sizeof(int), 6615 .mode = 0644, 6616 .proc_handler = proc_dointvec_jiffies, 6617 }, 6618 { 6619 .procname = "router_solicitation_delay", 6620 .data = &ipv6_devconf.rtr_solicit_delay, 6621 .maxlen = sizeof(int), 6622 .mode = 0644, 6623 .proc_handler = proc_dointvec_jiffies, 6624 }, 6625 { 6626 .procname = "force_mld_version", 6627 .data = &ipv6_devconf.force_mld_version, 6628 .maxlen = sizeof(int), 6629 .mode = 0644, 6630 .proc_handler = proc_dointvec, 6631 }, 6632 { 6633 .procname = "mldv1_unsolicited_report_interval", 6634 .data = 6635 &ipv6_devconf.mldv1_unsolicited_report_interval, 6636 .maxlen = sizeof(int), 6637 .mode = 0644, 6638 .proc_handler = proc_dointvec_ms_jiffies, 6639 }, 6640 { 6641 .procname = "mldv2_unsolicited_report_interval", 6642 .data = 6643 &ipv6_devconf.mldv2_unsolicited_report_interval, 6644 .maxlen = sizeof(int), 6645 .mode = 0644, 6646 .proc_handler = proc_dointvec_ms_jiffies, 6647 }, 6648 { 6649 .procname = "use_tempaddr", 6650 .data = &ipv6_devconf.use_tempaddr, 6651 .maxlen = sizeof(int), 6652 .mode = 0644, 6653 .proc_handler = proc_dointvec, 6654 }, 6655 { 6656 .procname = "temp_valid_lft", 6657 .data = &ipv6_devconf.temp_valid_lft, 6658 .maxlen = sizeof(int), 6659 .mode = 0644, 6660 .proc_handler = proc_dointvec, 6661 }, 6662 { 6663 .procname = "temp_prefered_lft", 6664 .data = &ipv6_devconf.temp_prefered_lft, 6665 .maxlen = sizeof(int), 6666 .mode = 0644, 6667 .proc_handler = proc_dointvec, 6668 }, 6669 { 6670 .procname = "regen_max_retry", 6671 .data = &ipv6_devconf.regen_max_retry, 6672 .maxlen = sizeof(int), 6673 .mode = 0644, 6674 .proc_handler = proc_dointvec, 6675 }, 6676 { 6677 .procname = "max_desync_factor", 6678 .data = &ipv6_devconf.max_desync_factor, 6679 .maxlen = sizeof(int), 6680 .mode = 0644, 6681 .proc_handler = proc_dointvec, 6682 }, 6683 { 6684 .procname = "max_addresses", 6685 .data = &ipv6_devconf.max_addresses, 6686 .maxlen = sizeof(int), 6687 .mode = 0644, 6688 .proc_handler = proc_dointvec, 6689 }, 6690 { 6691 .procname = "accept_ra_defrtr", 6692 .data = &ipv6_devconf.accept_ra_defrtr, 6693 .maxlen = sizeof(int), 6694 .mode = 0644, 6695 .proc_handler = proc_dointvec, 6696 }, 6697 { 6698 .procname = "ra_defrtr_metric", 6699 .data = &ipv6_devconf.ra_defrtr_metric, 6700 .maxlen = sizeof(u32), 6701 .mode = 0644, 6702 .proc_handler = proc_douintvec_minmax, 6703 .extra1 = (void *)SYSCTL_ONE, 6704 }, 6705 { 6706 .procname = "accept_ra_min_hop_limit", 6707 .data = &ipv6_devconf.accept_ra_min_hop_limit, 6708 .maxlen = sizeof(int), 6709 .mode = 0644, 6710 .proc_handler = proc_dointvec, 6711 }, 6712 { 6713 .procname = "accept_ra_pinfo", 6714 .data = &ipv6_devconf.accept_ra_pinfo, 6715 .maxlen = sizeof(int), 6716 .mode = 0644, 6717 .proc_handler = proc_dointvec, 6718 }, 6719 #ifdef CONFIG_IPV6_ROUTER_PREF 6720 { 6721 .procname = "accept_ra_rtr_pref", 6722 .data = &ipv6_devconf.accept_ra_rtr_pref, 6723 .maxlen = sizeof(int), 6724 .mode = 0644, 6725 .proc_handler = proc_dointvec, 6726 }, 6727 { 6728 .procname = "router_probe_interval", 6729 .data = &ipv6_devconf.rtr_probe_interval, 6730 .maxlen = sizeof(int), 6731 .mode = 0644, 6732 .proc_handler = proc_dointvec_jiffies, 6733 }, 6734 #ifdef CONFIG_IPV6_ROUTE_INFO 6735 { 6736 .procname = "accept_ra_rt_info_min_plen", 6737 .data = &ipv6_devconf.accept_ra_rt_info_min_plen, 6738 .maxlen = sizeof(int), 6739 .mode = 0644, 6740 .proc_handler = proc_dointvec, 6741 }, 6742 { 6743 .procname = "accept_ra_rt_info_max_plen", 6744 .data = &ipv6_devconf.accept_ra_rt_info_max_plen, 6745 .maxlen = sizeof(int), 6746 .mode = 0644, 6747 .proc_handler = proc_dointvec, 6748 }, 6749 #endif 6750 #endif 6751 { 6752 .procname = "proxy_ndp", 6753 .data = &ipv6_devconf.proxy_ndp, 6754 .maxlen = sizeof(int), 6755 .mode = 0644, 6756 .proc_handler = addrconf_sysctl_proxy_ndp, 6757 }, 6758 { 6759 .procname = "accept_source_route", 6760 .data = &ipv6_devconf.accept_source_route, 6761 .maxlen = sizeof(int), 6762 .mode = 0644, 6763 .proc_handler = proc_dointvec, 6764 }, 6765 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 6766 { 6767 .procname = "optimistic_dad", 6768 .data = &ipv6_devconf.optimistic_dad, 6769 .maxlen = sizeof(int), 6770 .mode = 0644, 6771 .proc_handler = proc_dointvec, 6772 }, 6773 { 6774 .procname = "use_optimistic", 6775 .data = &ipv6_devconf.use_optimistic, 6776 .maxlen = sizeof(int), 6777 .mode = 0644, 6778 .proc_handler = proc_dointvec, 6779 }, 6780 #endif 6781 #ifdef CONFIG_IPV6_MROUTE 6782 { 6783 .procname = "mc_forwarding", 6784 .data = &ipv6_devconf.mc_forwarding, 6785 .maxlen = sizeof(int), 6786 .mode = 0444, 6787 .proc_handler = proc_dointvec, 6788 }, 6789 #endif 6790 { 6791 .procname = "disable_ipv6", 6792 .data = &ipv6_devconf.disable_ipv6, 6793 .maxlen = sizeof(int), 6794 .mode = 0644, 6795 .proc_handler = addrconf_sysctl_disable, 6796 }, 6797 { 6798 .procname = "accept_dad", 6799 .data = &ipv6_devconf.accept_dad, 6800 .maxlen = sizeof(int), 6801 .mode = 0644, 6802 .proc_handler = proc_dointvec, 6803 }, 6804 { 6805 .procname = "force_tllao", 6806 .data = &ipv6_devconf.force_tllao, 6807 .maxlen = sizeof(int), 6808 .mode = 0644, 6809 .proc_handler = proc_dointvec 6810 }, 6811 { 6812 .procname = "ndisc_notify", 6813 .data = &ipv6_devconf.ndisc_notify, 6814 .maxlen = sizeof(int), 6815 .mode = 0644, 6816 .proc_handler = proc_dointvec 6817 }, 6818 { 6819 .procname = "suppress_frag_ndisc", 6820 .data = &ipv6_devconf.suppress_frag_ndisc, 6821 .maxlen = sizeof(int), 6822 .mode = 0644, 6823 .proc_handler = proc_dointvec 6824 }, 6825 { 6826 .procname = "accept_ra_from_local", 6827 .data = &ipv6_devconf.accept_ra_from_local, 6828 .maxlen = sizeof(int), 6829 .mode = 0644, 6830 .proc_handler = proc_dointvec, 6831 }, 6832 { 6833 .procname = "accept_ra_mtu", 6834 .data = &ipv6_devconf.accept_ra_mtu, 6835 .maxlen = sizeof(int), 6836 .mode = 0644, 6837 .proc_handler = proc_dointvec, 6838 }, 6839 { 6840 .procname = "stable_secret", 6841 .data = &ipv6_devconf.stable_secret, 6842 .maxlen = IPV6_MAX_STRLEN, 6843 .mode = 0600, 6844 .proc_handler = addrconf_sysctl_stable_secret, 6845 }, 6846 { 6847 .procname = "use_oif_addrs_only", 6848 .data = &ipv6_devconf.use_oif_addrs_only, 6849 .maxlen = sizeof(int), 6850 .mode = 0644, 6851 .proc_handler = proc_dointvec, 6852 }, 6853 { 6854 .procname = "ignore_routes_with_linkdown", 6855 .data = &ipv6_devconf.ignore_routes_with_linkdown, 6856 .maxlen = sizeof(int), 6857 .mode = 0644, 6858 .proc_handler = addrconf_sysctl_ignore_routes_with_linkdown, 6859 }, 6860 { 6861 .procname = "drop_unicast_in_l2_multicast", 6862 .data = &ipv6_devconf.drop_unicast_in_l2_multicast, 6863 .maxlen = sizeof(int), 6864 .mode = 0644, 6865 .proc_handler = proc_dointvec, 6866 }, 6867 { 6868 .procname = "drop_unsolicited_na", 6869 .data = &ipv6_devconf.drop_unsolicited_na, 6870 .maxlen = sizeof(int), 6871 .mode = 0644, 6872 .proc_handler = proc_dointvec, 6873 }, 6874 { 6875 .procname = "keep_addr_on_down", 6876 .data = &ipv6_devconf.keep_addr_on_down, 6877 .maxlen = sizeof(int), 6878 .mode = 0644, 6879 .proc_handler = proc_dointvec, 6880 6881 }, 6882 { 6883 .procname = "seg6_enabled", 6884 .data = &ipv6_devconf.seg6_enabled, 6885 .maxlen = sizeof(int), 6886 .mode = 0644, 6887 .proc_handler = proc_dointvec, 6888 }, 6889 #ifdef CONFIG_IPV6_SEG6_HMAC 6890 { 6891 .procname = "seg6_require_hmac", 6892 .data = &ipv6_devconf.seg6_require_hmac, 6893 .maxlen = sizeof(int), 6894 .mode = 0644, 6895 .proc_handler = proc_dointvec, 6896 }, 6897 #endif 6898 { 6899 .procname = "enhanced_dad", 6900 .data = &ipv6_devconf.enhanced_dad, 6901 .maxlen = sizeof(int), 6902 .mode = 0644, 6903 .proc_handler = proc_dointvec, 6904 }, 6905 { 6906 .procname = "addr_gen_mode", 6907 .data = &ipv6_devconf.addr_gen_mode, 6908 .maxlen = sizeof(int), 6909 .mode = 0644, 6910 .proc_handler = addrconf_sysctl_addr_gen_mode, 6911 }, 6912 { 6913 .procname = "disable_policy", 6914 .data = &ipv6_devconf.disable_policy, 6915 .maxlen = sizeof(int), 6916 .mode = 0644, 6917 .proc_handler = addrconf_sysctl_disable_policy, 6918 }, 6919 { 6920 .procname = "ndisc_tclass", 6921 .data = &ipv6_devconf.ndisc_tclass, 6922 .maxlen = sizeof(int), 6923 .mode = 0644, 6924 .proc_handler = proc_dointvec_minmax, 6925 .extra1 = (void *)SYSCTL_ZERO, 6926 .extra2 = (void *)&two_five_five, 6927 }, 6928 { 6929 .procname = "rpl_seg_enabled", 6930 .data = &ipv6_devconf.rpl_seg_enabled, 6931 .maxlen = sizeof(int), 6932 .mode = 0644, 6933 .proc_handler = proc_dointvec, 6934 }, 6935 { 6936 /* sentinel */ 6937 } 6938 }; 6939 6940 static int __addrconf_sysctl_register(struct net *net, char *dev_name, 6941 struct inet6_dev *idev, struct ipv6_devconf *p) 6942 { 6943 int i, ifindex; 6944 struct ctl_table *table; 6945 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ]; 6946 6947 table = kmemdup(addrconf_sysctl, sizeof(addrconf_sysctl), GFP_KERNEL); 6948 if (!table) 6949 goto out; 6950 6951 for (i = 0; table[i].data; i++) { 6952 table[i].data += (char *)p - (char *)&ipv6_devconf; 6953 /* If one of these is already set, then it is not safe to 6954 * overwrite either of them: this makes proc_dointvec_minmax 6955 * usable. 6956 */ 6957 if (!table[i].extra1 && !table[i].extra2) { 6958 table[i].extra1 = idev; /* embedded; no ref */ 6959 table[i].extra2 = net; 6960 } 6961 } 6962 6963 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name); 6964 6965 p->sysctl_header = register_net_sysctl(net, path, table); 6966 if (!p->sysctl_header) 6967 goto free; 6968 6969 if (!strcmp(dev_name, "all")) 6970 ifindex = NETCONFA_IFINDEX_ALL; 6971 else if (!strcmp(dev_name, "default")) 6972 ifindex = NETCONFA_IFINDEX_DEFAULT; 6973 else 6974 ifindex = idev->dev->ifindex; 6975 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, NETCONFA_ALL, 6976 ifindex, p); 6977 return 0; 6978 6979 free: 6980 kfree(table); 6981 out: 6982 return -ENOBUFS; 6983 } 6984 6985 static void __addrconf_sysctl_unregister(struct net *net, 6986 struct ipv6_devconf *p, int ifindex) 6987 { 6988 struct ctl_table *table; 6989 6990 if (!p->sysctl_header) 6991 return; 6992 6993 table = p->sysctl_header->ctl_table_arg; 6994 unregister_net_sysctl_table(p->sysctl_header); 6995 p->sysctl_header = NULL; 6996 kfree(table); 6997 6998 inet6_netconf_notify_devconf(net, RTM_DELNETCONF, 0, ifindex, NULL); 6999 } 7000 7001 static int addrconf_sysctl_register(struct inet6_dev *idev) 7002 { 7003 int err; 7004 7005 if (!sysctl_dev_name_is_allowed(idev->dev->name)) 7006 return -EINVAL; 7007 7008 err = neigh_sysctl_register(idev->dev, idev->nd_parms, 7009 &ndisc_ifinfo_sysctl_change); 7010 if (err) 7011 return err; 7012 err = __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name, 7013 idev, &idev->cnf); 7014 if (err) 7015 neigh_sysctl_unregister(idev->nd_parms); 7016 7017 return err; 7018 } 7019 7020 static void addrconf_sysctl_unregister(struct inet6_dev *idev) 7021 { 7022 __addrconf_sysctl_unregister(dev_net(idev->dev), &idev->cnf, 7023 idev->dev->ifindex); 7024 neigh_sysctl_unregister(idev->nd_parms); 7025 } 7026 7027 7028 #endif 7029 7030 static int __net_init addrconf_init_net(struct net *net) 7031 { 7032 int err = -ENOMEM; 7033 struct ipv6_devconf *all, *dflt; 7034 7035 all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL); 7036 if (!all) 7037 goto err_alloc_all; 7038 7039 dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL); 7040 if (!dflt) 7041 goto err_alloc_dflt; 7042 7043 if (IS_ENABLED(CONFIG_SYSCTL) && 7044 !net_eq(net, &init_net)) { 7045 switch (sysctl_devconf_inherit_init_net) { 7046 case 1: /* copy from init_net */ 7047 memcpy(all, init_net.ipv6.devconf_all, 7048 sizeof(ipv6_devconf)); 7049 memcpy(dflt, init_net.ipv6.devconf_dflt, 7050 sizeof(ipv6_devconf_dflt)); 7051 break; 7052 case 3: /* copy from the current netns */ 7053 memcpy(all, current->nsproxy->net_ns->ipv6.devconf_all, 7054 sizeof(ipv6_devconf)); 7055 memcpy(dflt, 7056 current->nsproxy->net_ns->ipv6.devconf_dflt, 7057 sizeof(ipv6_devconf_dflt)); 7058 break; 7059 case 0: 7060 case 2: 7061 /* use compiled values */ 7062 break; 7063 } 7064 } 7065 7066 /* these will be inherited by all namespaces */ 7067 dflt->autoconf = ipv6_defaults.autoconf; 7068 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6; 7069 7070 dflt->stable_secret.initialized = false; 7071 all->stable_secret.initialized = false; 7072 7073 net->ipv6.devconf_all = all; 7074 net->ipv6.devconf_dflt = dflt; 7075 7076 #ifdef CONFIG_SYSCTL 7077 err = __addrconf_sysctl_register(net, "all", NULL, all); 7078 if (err < 0) 7079 goto err_reg_all; 7080 7081 err = __addrconf_sysctl_register(net, "default", NULL, dflt); 7082 if (err < 0) 7083 goto err_reg_dflt; 7084 #endif 7085 return 0; 7086 7087 #ifdef CONFIG_SYSCTL 7088 err_reg_dflt: 7089 __addrconf_sysctl_unregister(net, all, NETCONFA_IFINDEX_ALL); 7090 err_reg_all: 7091 kfree(dflt); 7092 #endif 7093 err_alloc_dflt: 7094 kfree(all); 7095 err_alloc_all: 7096 return err; 7097 } 7098 7099 static void __net_exit addrconf_exit_net(struct net *net) 7100 { 7101 #ifdef CONFIG_SYSCTL 7102 __addrconf_sysctl_unregister(net, net->ipv6.devconf_dflt, 7103 NETCONFA_IFINDEX_DEFAULT); 7104 __addrconf_sysctl_unregister(net, net->ipv6.devconf_all, 7105 NETCONFA_IFINDEX_ALL); 7106 #endif 7107 kfree(net->ipv6.devconf_dflt); 7108 kfree(net->ipv6.devconf_all); 7109 } 7110 7111 static struct pernet_operations addrconf_ops = { 7112 .init = addrconf_init_net, 7113 .exit = addrconf_exit_net, 7114 }; 7115 7116 static struct rtnl_af_ops inet6_ops __read_mostly = { 7117 .family = AF_INET6, 7118 .fill_link_af = inet6_fill_link_af, 7119 .get_link_af_size = inet6_get_link_af_size, 7120 .validate_link_af = inet6_validate_link_af, 7121 .set_link_af = inet6_set_link_af, 7122 }; 7123 7124 /* 7125 * Init / cleanup code 7126 */ 7127 7128 int __init addrconf_init(void) 7129 { 7130 struct inet6_dev *idev; 7131 int i, err; 7132 7133 err = ipv6_addr_label_init(); 7134 if (err < 0) { 7135 pr_crit("%s: cannot initialize default policy table: %d\n", 7136 __func__, err); 7137 goto out; 7138 } 7139 7140 err = register_pernet_subsys(&addrconf_ops); 7141 if (err < 0) 7142 goto out_addrlabel; 7143 7144 addrconf_wq = create_workqueue("ipv6_addrconf"); 7145 if (!addrconf_wq) { 7146 err = -ENOMEM; 7147 goto out_nowq; 7148 } 7149 7150 /* The addrconf netdev notifier requires that loopback_dev 7151 * has it's ipv6 private information allocated and setup 7152 * before it can bring up and give link-local addresses 7153 * to other devices which are up. 7154 * 7155 * Unfortunately, loopback_dev is not necessarily the first 7156 * entry in the global dev_base list of net devices. In fact, 7157 * it is likely to be the very last entry on that list. 7158 * So this causes the notifier registry below to try and 7159 * give link-local addresses to all devices besides loopback_dev 7160 * first, then loopback_dev, which cases all the non-loopback_dev 7161 * devices to fail to get a link-local address. 7162 * 7163 * So, as a temporary fix, allocate the ipv6 structure for 7164 * loopback_dev first by hand. 7165 * Longer term, all of the dependencies ipv6 has upon the loopback 7166 * device and it being up should be removed. 7167 */ 7168 rtnl_lock(); 7169 idev = ipv6_add_dev(init_net.loopback_dev); 7170 rtnl_unlock(); 7171 if (IS_ERR(idev)) { 7172 err = PTR_ERR(idev); 7173 goto errlo; 7174 } 7175 7176 ip6_route_init_special_entries(); 7177 7178 for (i = 0; i < IN6_ADDR_HSIZE; i++) 7179 INIT_HLIST_HEAD(&inet6_addr_lst[i]); 7180 7181 register_netdevice_notifier(&ipv6_dev_notf); 7182 7183 addrconf_verify(); 7184 7185 rtnl_af_register(&inet6_ops); 7186 7187 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETLINK, 7188 NULL, inet6_dump_ifinfo, 0); 7189 if (err < 0) 7190 goto errout; 7191 7192 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_NEWADDR, 7193 inet6_rtm_newaddr, NULL, 0); 7194 if (err < 0) 7195 goto errout; 7196 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_DELADDR, 7197 inet6_rtm_deladdr, NULL, 0); 7198 if (err < 0) 7199 goto errout; 7200 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETADDR, 7201 inet6_rtm_getaddr, inet6_dump_ifaddr, 7202 RTNL_FLAG_DOIT_UNLOCKED); 7203 if (err < 0) 7204 goto errout; 7205 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETMULTICAST, 7206 NULL, inet6_dump_ifmcaddr, 0); 7207 if (err < 0) 7208 goto errout; 7209 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETANYCAST, 7210 NULL, inet6_dump_ifacaddr, 0); 7211 if (err < 0) 7212 goto errout; 7213 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETNETCONF, 7214 inet6_netconf_get_devconf, 7215 inet6_netconf_dump_devconf, 7216 RTNL_FLAG_DOIT_UNLOCKED); 7217 if (err < 0) 7218 goto errout; 7219 err = ipv6_addr_label_rtnl_register(); 7220 if (err < 0) 7221 goto errout; 7222 7223 return 0; 7224 errout: 7225 rtnl_unregister_all(PF_INET6); 7226 rtnl_af_unregister(&inet6_ops); 7227 unregister_netdevice_notifier(&ipv6_dev_notf); 7228 errlo: 7229 destroy_workqueue(addrconf_wq); 7230 out_nowq: 7231 unregister_pernet_subsys(&addrconf_ops); 7232 out_addrlabel: 7233 ipv6_addr_label_cleanup(); 7234 out: 7235 return err; 7236 } 7237 7238 void addrconf_cleanup(void) 7239 { 7240 struct net_device *dev; 7241 int i; 7242 7243 unregister_netdevice_notifier(&ipv6_dev_notf); 7244 unregister_pernet_subsys(&addrconf_ops); 7245 ipv6_addr_label_cleanup(); 7246 7247 rtnl_af_unregister(&inet6_ops); 7248 7249 rtnl_lock(); 7250 7251 /* clean dev list */ 7252 for_each_netdev(&init_net, dev) { 7253 if (__in6_dev_get(dev) == NULL) 7254 continue; 7255 addrconf_ifdown(dev, true); 7256 } 7257 addrconf_ifdown(init_net.loopback_dev, true); 7258 7259 /* 7260 * Check hash table. 7261 */ 7262 spin_lock_bh(&addrconf_hash_lock); 7263 for (i = 0; i < IN6_ADDR_HSIZE; i++) 7264 WARN_ON(!hlist_empty(&inet6_addr_lst[i])); 7265 spin_unlock_bh(&addrconf_hash_lock); 7266 cancel_delayed_work(&addr_chk_work); 7267 rtnl_unlock(); 7268 7269 destroy_workqueue(addrconf_wq); 7270 } 7271