1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * IPv6 Address [auto]configuration 4 * Linux INET6 implementation 5 * 6 * Authors: 7 * Pedro Roque <roque@di.fc.ul.pt> 8 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru> 9 */ 10 11 /* 12 * Changes: 13 * 14 * Janos Farkas : delete timer on ifdown 15 * <chexum@bankinf.banki.hu> 16 * Andi Kleen : kill double kfree on module 17 * unload. 18 * Maciej W. Rozycki : FDDI support 19 * sekiya@USAGI : Don't send too many RS 20 * packets. 21 * yoshfuji@USAGI : Fixed interval between DAD 22 * packets. 23 * YOSHIFUJI Hideaki @USAGI : improved accuracy of 24 * address validation timer. 25 * YOSHIFUJI Hideaki @USAGI : Privacy Extensions (RFC3041) 26 * support. 27 * Yuji SEKIYA @USAGI : Don't assign a same IPv6 28 * address on a same interface. 29 * YOSHIFUJI Hideaki @USAGI : ARCnet support 30 * YOSHIFUJI Hideaki @USAGI : convert /proc/net/if_inet6 to 31 * seq_file. 32 * YOSHIFUJI Hideaki @USAGI : improved source address 33 * selection; consider scope, 34 * status etc. 35 */ 36 37 #define pr_fmt(fmt) "IPv6: " fmt 38 39 #include <linux/errno.h> 40 #include <linux/types.h> 41 #include <linux/kernel.h> 42 #include <linux/sched/signal.h> 43 #include <linux/socket.h> 44 #include <linux/sockios.h> 45 #include <linux/net.h> 46 #include <linux/inet.h> 47 #include <linux/in6.h> 48 #include <linux/netdevice.h> 49 #include <linux/if_addr.h> 50 #include <linux/if_arp.h> 51 #include <linux/if_arcnet.h> 52 #include <linux/if_infiniband.h> 53 #include <linux/route.h> 54 #include <linux/inetdevice.h> 55 #include <linux/init.h> 56 #include <linux/slab.h> 57 #ifdef CONFIG_SYSCTL 58 #include <linux/sysctl.h> 59 #endif 60 #include <linux/capability.h> 61 #include <linux/delay.h> 62 #include <linux/notifier.h> 63 #include <linux/string.h> 64 #include <linux/hash.h> 65 66 #include <net/net_namespace.h> 67 #include <net/sock.h> 68 #include <net/snmp.h> 69 70 #include <net/6lowpan.h> 71 #include <net/firewire.h> 72 #include <net/ipv6.h> 73 #include <net/protocol.h> 74 #include <net/ndisc.h> 75 #include <net/ip6_route.h> 76 #include <net/addrconf.h> 77 #include <net/tcp.h> 78 #include <net/ip.h> 79 #include <net/netlink.h> 80 #include <net/pkt_sched.h> 81 #include <net/l3mdev.h> 82 #include <linux/if_tunnel.h> 83 #include <linux/rtnetlink.h> 84 #include <linux/netconf.h> 85 #include <linux/random.h> 86 #include <linux/uaccess.h> 87 #include <asm/unaligned.h> 88 89 #include <linux/proc_fs.h> 90 #include <linux/seq_file.h> 91 #include <linux/export.h> 92 93 #define INFINITY_LIFE_TIME 0xFFFFFFFF 94 95 #define IPV6_MAX_STRLEN \ 96 sizeof("ffff:ffff:ffff:ffff:ffff:ffff:255.255.255.255") 97 98 static inline u32 cstamp_delta(unsigned long cstamp) 99 { 100 return (cstamp - INITIAL_JIFFIES) * 100UL / HZ; 101 } 102 103 static inline s32 rfc3315_s14_backoff_init(s32 irt) 104 { 105 /* multiply 'initial retransmission time' by 0.9 .. 1.1 */ 106 u64 tmp = (900000 + prandom_u32() % 200001) * (u64)irt; 107 do_div(tmp, 1000000); 108 return (s32)tmp; 109 } 110 111 static inline s32 rfc3315_s14_backoff_update(s32 rt, s32 mrt) 112 { 113 /* multiply 'retransmission timeout' by 1.9 .. 2.1 */ 114 u64 tmp = (1900000 + prandom_u32() % 200001) * (u64)rt; 115 do_div(tmp, 1000000); 116 if ((s32)tmp > mrt) { 117 /* multiply 'maximum retransmission time' by 0.9 .. 1.1 */ 118 tmp = (900000 + prandom_u32() % 200001) * (u64)mrt; 119 do_div(tmp, 1000000); 120 } 121 return (s32)tmp; 122 } 123 124 #ifdef CONFIG_SYSCTL 125 static int addrconf_sysctl_register(struct inet6_dev *idev); 126 static void addrconf_sysctl_unregister(struct inet6_dev *idev); 127 #else 128 static inline int addrconf_sysctl_register(struct inet6_dev *idev) 129 { 130 return 0; 131 } 132 133 static inline void addrconf_sysctl_unregister(struct inet6_dev *idev) 134 { 135 } 136 #endif 137 138 static void ipv6_regen_rndid(struct inet6_dev *idev); 139 static void ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr); 140 141 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev); 142 static int ipv6_count_addresses(const struct inet6_dev *idev); 143 static int ipv6_generate_stable_address(struct in6_addr *addr, 144 u8 dad_count, 145 const struct inet6_dev *idev); 146 147 #define IN6_ADDR_HSIZE_SHIFT 8 148 #define IN6_ADDR_HSIZE (1 << IN6_ADDR_HSIZE_SHIFT) 149 /* 150 * Configured unicast address hash table 151 */ 152 static struct hlist_head inet6_addr_lst[IN6_ADDR_HSIZE]; 153 static DEFINE_SPINLOCK(addrconf_hash_lock); 154 155 static void addrconf_verify(void); 156 static void addrconf_verify_rtnl(void); 157 static void addrconf_verify_work(struct work_struct *); 158 159 static struct workqueue_struct *addrconf_wq; 160 static DECLARE_DELAYED_WORK(addr_chk_work, addrconf_verify_work); 161 162 static void addrconf_join_anycast(struct inet6_ifaddr *ifp); 163 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp); 164 165 static void addrconf_type_change(struct net_device *dev, 166 unsigned long event); 167 static int addrconf_ifdown(struct net_device *dev, int how); 168 169 static struct fib6_info *addrconf_get_prefix_route(const struct in6_addr *pfx, 170 int plen, 171 const struct net_device *dev, 172 u32 flags, u32 noflags, 173 bool no_gw); 174 175 static void addrconf_dad_start(struct inet6_ifaddr *ifp); 176 static void addrconf_dad_work(struct work_struct *w); 177 static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id, 178 bool send_na); 179 static void addrconf_dad_run(struct inet6_dev *idev, bool restart); 180 static void addrconf_rs_timer(struct timer_list *t); 181 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa); 182 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa); 183 184 static void inet6_prefix_notify(int event, struct inet6_dev *idev, 185 struct prefix_info *pinfo); 186 187 static struct ipv6_devconf ipv6_devconf __read_mostly = { 188 .forwarding = 0, 189 .hop_limit = IPV6_DEFAULT_HOPLIMIT, 190 .mtu6 = IPV6_MIN_MTU, 191 .accept_ra = 1, 192 .accept_redirects = 1, 193 .autoconf = 1, 194 .force_mld_version = 0, 195 .mldv1_unsolicited_report_interval = 10 * HZ, 196 .mldv2_unsolicited_report_interval = HZ, 197 .dad_transmits = 1, 198 .rtr_solicits = MAX_RTR_SOLICITATIONS, 199 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL, 200 .rtr_solicit_max_interval = RTR_SOLICITATION_MAX_INTERVAL, 201 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY, 202 .use_tempaddr = 0, 203 .temp_valid_lft = TEMP_VALID_LIFETIME, 204 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME, 205 .regen_max_retry = REGEN_MAX_RETRY, 206 .max_desync_factor = MAX_DESYNC_FACTOR, 207 .max_addresses = IPV6_MAX_ADDRESSES, 208 .accept_ra_defrtr = 1, 209 .accept_ra_from_local = 0, 210 .accept_ra_min_hop_limit= 1, 211 .accept_ra_pinfo = 1, 212 #ifdef CONFIG_IPV6_ROUTER_PREF 213 .accept_ra_rtr_pref = 1, 214 .rtr_probe_interval = 60 * HZ, 215 #ifdef CONFIG_IPV6_ROUTE_INFO 216 .accept_ra_rt_info_min_plen = 0, 217 .accept_ra_rt_info_max_plen = 0, 218 #endif 219 #endif 220 .proxy_ndp = 0, 221 .accept_source_route = 0, /* we do not accept RH0 by default. */ 222 .disable_ipv6 = 0, 223 .accept_dad = 0, 224 .suppress_frag_ndisc = 1, 225 .accept_ra_mtu = 1, 226 .stable_secret = { 227 .initialized = false, 228 }, 229 .use_oif_addrs_only = 0, 230 .ignore_routes_with_linkdown = 0, 231 .keep_addr_on_down = 0, 232 .seg6_enabled = 0, 233 #ifdef CONFIG_IPV6_SEG6_HMAC 234 .seg6_require_hmac = 0, 235 #endif 236 .enhanced_dad = 1, 237 .addr_gen_mode = IN6_ADDR_GEN_MODE_EUI64, 238 .disable_policy = 0, 239 .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 .accept_ra_from_local = 0, 265 .accept_ra_min_hop_limit= 1, 266 .accept_ra_pinfo = 1, 267 #ifdef CONFIG_IPV6_ROUTER_PREF 268 .accept_ra_rtr_pref = 1, 269 .rtr_probe_interval = 60 * HZ, 270 #ifdef CONFIG_IPV6_ROUTE_INFO 271 .accept_ra_rt_info_min_plen = 0, 272 .accept_ra_rt_info_max_plen = 0, 273 #endif 274 #endif 275 .proxy_ndp = 0, 276 .accept_source_route = 0, /* we do not accept RH0 by default. */ 277 .disable_ipv6 = 0, 278 .accept_dad = 1, 279 .suppress_frag_ndisc = 1, 280 .accept_ra_mtu = 1, 281 .stable_secret = { 282 .initialized = false, 283 }, 284 .use_oif_addrs_only = 0, 285 .ignore_routes_with_linkdown = 0, 286 .keep_addr_on_down = 0, 287 .seg6_enabled = 0, 288 #ifdef CONFIG_IPV6_SEG6_HMAC 289 .seg6_require_hmac = 0, 290 #endif 291 .enhanced_dad = 1, 292 .addr_gen_mode = IN6_ADDR_GEN_MODE_EUI64, 293 .disable_policy = 0, 294 .rpl_seg_enabled = 0, 295 }; 296 297 /* Check if link is ready: is it up and is a valid qdisc available */ 298 static inline bool addrconf_link_ready(const struct net_device *dev) 299 { 300 return netif_oper_up(dev) && !qdisc_tx_is_noop(dev); 301 } 302 303 static void addrconf_del_rs_timer(struct inet6_dev *idev) 304 { 305 if (del_timer(&idev->rs_timer)) 306 __in6_dev_put(idev); 307 } 308 309 static void addrconf_del_dad_work(struct inet6_ifaddr *ifp) 310 { 311 if (cancel_delayed_work(&ifp->dad_work)) 312 __in6_ifa_put(ifp); 313 } 314 315 static void addrconf_mod_rs_timer(struct inet6_dev *idev, 316 unsigned long when) 317 { 318 if (!timer_pending(&idev->rs_timer)) 319 in6_dev_hold(idev); 320 mod_timer(&idev->rs_timer, jiffies + when); 321 } 322 323 static void addrconf_mod_dad_work(struct inet6_ifaddr *ifp, 324 unsigned long delay) 325 { 326 in6_ifa_hold(ifp); 327 if (mod_delayed_work(addrconf_wq, &ifp->dad_work, delay)) 328 in6_ifa_put(ifp); 329 } 330 331 static int snmp6_alloc_dev(struct inet6_dev *idev) 332 { 333 int i; 334 335 idev->stats.ipv6 = alloc_percpu(struct ipstats_mib); 336 if (!idev->stats.ipv6) 337 goto err_ip; 338 339 for_each_possible_cpu(i) { 340 struct ipstats_mib *addrconf_stats; 341 addrconf_stats = per_cpu_ptr(idev->stats.ipv6, i); 342 u64_stats_init(&addrconf_stats->syncp); 343 } 344 345 346 idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device), 347 GFP_KERNEL); 348 if (!idev->stats.icmpv6dev) 349 goto err_icmp; 350 idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device), 351 GFP_KERNEL); 352 if (!idev->stats.icmpv6msgdev) 353 goto err_icmpmsg; 354 355 return 0; 356 357 err_icmpmsg: 358 kfree(idev->stats.icmpv6dev); 359 err_icmp: 360 free_percpu(idev->stats.ipv6); 361 err_ip: 362 return -ENOMEM; 363 } 364 365 static struct inet6_dev *ipv6_add_dev(struct net_device *dev) 366 { 367 struct inet6_dev *ndev; 368 int err = -ENOMEM; 369 370 ASSERT_RTNL(); 371 372 if (dev->mtu < IPV6_MIN_MTU) 373 return ERR_PTR(-EINVAL); 374 375 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL); 376 if (!ndev) 377 return ERR_PTR(err); 378 379 rwlock_init(&ndev->lock); 380 ndev->dev = dev; 381 INIT_LIST_HEAD(&ndev->addr_list); 382 timer_setup(&ndev->rs_timer, addrconf_rs_timer, 0); 383 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf)); 384 385 if (ndev->cnf.stable_secret.initialized) 386 ndev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY; 387 388 ndev->cnf.mtu6 = dev->mtu; 389 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl); 390 if (!ndev->nd_parms) { 391 kfree(ndev); 392 return ERR_PTR(err); 393 } 394 if (ndev->cnf.forwarding) 395 dev_disable_lro(dev); 396 /* We refer to the device */ 397 dev_hold(dev); 398 399 if (snmp6_alloc_dev(ndev) < 0) { 400 netdev_dbg(dev, "%s: cannot allocate memory for statistics\n", 401 __func__); 402 neigh_parms_release(&nd_tbl, ndev->nd_parms); 403 dev_put(dev); 404 kfree(ndev); 405 return ERR_PTR(err); 406 } 407 408 if (snmp6_register_dev(ndev) < 0) { 409 netdev_dbg(dev, "%s: cannot create /proc/net/dev_snmp6/%s\n", 410 __func__, dev->name); 411 goto err_release; 412 } 413 414 /* One reference from device. */ 415 refcount_set(&ndev->refcnt, 1); 416 417 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK)) 418 ndev->cnf.accept_dad = -1; 419 420 #if IS_ENABLED(CONFIG_IPV6_SIT) 421 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) { 422 pr_info("%s: Disabled Multicast RS\n", dev->name); 423 ndev->cnf.rtr_solicits = 0; 424 } 425 #endif 426 427 INIT_LIST_HEAD(&ndev->tempaddr_list); 428 ndev->desync_factor = U32_MAX; 429 if ((dev->flags&IFF_LOOPBACK) || 430 dev->type == ARPHRD_TUNNEL || 431 dev->type == ARPHRD_TUNNEL6 || 432 dev->type == ARPHRD_SIT || 433 dev->type == ARPHRD_NONE) { 434 ndev->cnf.use_tempaddr = -1; 435 } else 436 ipv6_regen_rndid(ndev); 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); 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, 1310 struct inet6_ifaddr *ift, 1311 bool block) 1312 { 1313 struct inet6_dev *idev = ifp->idev; 1314 struct in6_addr addr, *tmpaddr; 1315 unsigned long tmp_tstamp, age; 1316 unsigned long regen_advance; 1317 struct ifa6_config cfg; 1318 int ret = 0; 1319 unsigned long now = jiffies; 1320 long max_desync_factor; 1321 s32 cnf_temp_preferred_lft; 1322 1323 write_lock_bh(&idev->lock); 1324 if (ift) { 1325 spin_lock_bh(&ift->lock); 1326 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8); 1327 spin_unlock_bh(&ift->lock); 1328 tmpaddr = &addr; 1329 } else { 1330 tmpaddr = NULL; 1331 } 1332 retry: 1333 in6_dev_hold(idev); 1334 if (idev->cnf.use_tempaddr <= 0) { 1335 write_unlock_bh(&idev->lock); 1336 pr_info("%s: use_tempaddr is disabled\n", __func__); 1337 in6_dev_put(idev); 1338 ret = -1; 1339 goto out; 1340 } 1341 spin_lock_bh(&ifp->lock); 1342 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) { 1343 idev->cnf.use_tempaddr = -1; /*XXX*/ 1344 spin_unlock_bh(&ifp->lock); 1345 write_unlock_bh(&idev->lock); 1346 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n", 1347 __func__); 1348 in6_dev_put(idev); 1349 ret = -1; 1350 goto out; 1351 } 1352 in6_ifa_hold(ifp); 1353 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8); 1354 ipv6_try_regen_rndid(idev, tmpaddr); 1355 memcpy(&addr.s6_addr[8], idev->rndid, 8); 1356 age = (now - ifp->tstamp) / HZ; 1357 1358 regen_advance = idev->cnf.regen_max_retry * 1359 idev->cnf.dad_transmits * 1360 max(NEIGH_VAR(idev->nd_parms, RETRANS_TIME), HZ/100) / HZ; 1361 1362 /* recalculate max_desync_factor each time and update 1363 * idev->desync_factor if it's larger 1364 */ 1365 cnf_temp_preferred_lft = READ_ONCE(idev->cnf.temp_prefered_lft); 1366 max_desync_factor = min_t(__u32, 1367 idev->cnf.max_desync_factor, 1368 cnf_temp_preferred_lft - regen_advance); 1369 1370 if (unlikely(idev->desync_factor > max_desync_factor)) { 1371 if (max_desync_factor > 0) { 1372 get_random_bytes(&idev->desync_factor, 1373 sizeof(idev->desync_factor)); 1374 idev->desync_factor %= max_desync_factor; 1375 } else { 1376 idev->desync_factor = 0; 1377 } 1378 } 1379 1380 memset(&cfg, 0, sizeof(cfg)); 1381 cfg.valid_lft = min_t(__u32, ifp->valid_lft, 1382 idev->cnf.temp_valid_lft + age); 1383 cfg.preferred_lft = cnf_temp_preferred_lft + age - idev->desync_factor; 1384 cfg.preferred_lft = min_t(__u32, ifp->prefered_lft, cfg.preferred_lft); 1385 1386 cfg.plen = ifp->prefix_len; 1387 tmp_tstamp = ifp->tstamp; 1388 spin_unlock_bh(&ifp->lock); 1389 1390 write_unlock_bh(&idev->lock); 1391 1392 /* A temporary address is created only if this calculated Preferred 1393 * Lifetime is greater than REGEN_ADVANCE time units. In particular, 1394 * an implementation must not create a temporary address with a zero 1395 * Preferred Lifetime. 1396 * Use age calculation as in addrconf_verify to avoid unnecessary 1397 * temporary addresses being generated. 1398 */ 1399 age = (now - tmp_tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ; 1400 if (cfg.preferred_lft <= regen_advance + age) { 1401 in6_ifa_put(ifp); 1402 in6_dev_put(idev); 1403 ret = -1; 1404 goto out; 1405 } 1406 1407 cfg.ifa_flags = IFA_F_TEMPORARY; 1408 /* set in addrconf_prefix_rcv() */ 1409 if (ifp->flags & IFA_F_OPTIMISTIC) 1410 cfg.ifa_flags |= IFA_F_OPTIMISTIC; 1411 1412 cfg.pfx = &addr; 1413 cfg.scope = ipv6_addr_scope(cfg.pfx); 1414 1415 ift = ipv6_add_addr(idev, &cfg, block, NULL); 1416 if (IS_ERR(ift)) { 1417 in6_ifa_put(ifp); 1418 in6_dev_put(idev); 1419 pr_info("%s: retry temporary address regeneration\n", __func__); 1420 tmpaddr = &addr; 1421 write_lock_bh(&idev->lock); 1422 goto retry; 1423 } 1424 1425 spin_lock_bh(&ift->lock); 1426 ift->ifpub = ifp; 1427 ift->cstamp = now; 1428 ift->tstamp = tmp_tstamp; 1429 spin_unlock_bh(&ift->lock); 1430 1431 addrconf_dad_start(ift); 1432 in6_ifa_put(ift); 1433 in6_dev_put(idev); 1434 out: 1435 return ret; 1436 } 1437 1438 /* 1439 * Choose an appropriate source address (RFC3484) 1440 */ 1441 enum { 1442 IPV6_SADDR_RULE_INIT = 0, 1443 IPV6_SADDR_RULE_LOCAL, 1444 IPV6_SADDR_RULE_SCOPE, 1445 IPV6_SADDR_RULE_PREFERRED, 1446 #ifdef CONFIG_IPV6_MIP6 1447 IPV6_SADDR_RULE_HOA, 1448 #endif 1449 IPV6_SADDR_RULE_OIF, 1450 IPV6_SADDR_RULE_LABEL, 1451 IPV6_SADDR_RULE_PRIVACY, 1452 IPV6_SADDR_RULE_ORCHID, 1453 IPV6_SADDR_RULE_PREFIX, 1454 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1455 IPV6_SADDR_RULE_NOT_OPTIMISTIC, 1456 #endif 1457 IPV6_SADDR_RULE_MAX 1458 }; 1459 1460 struct ipv6_saddr_score { 1461 int rule; 1462 int addr_type; 1463 struct inet6_ifaddr *ifa; 1464 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX); 1465 int scopedist; 1466 int matchlen; 1467 }; 1468 1469 struct ipv6_saddr_dst { 1470 const struct in6_addr *addr; 1471 int ifindex; 1472 int scope; 1473 int label; 1474 unsigned int prefs; 1475 }; 1476 1477 static inline int ipv6_saddr_preferred(int type) 1478 { 1479 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK)) 1480 return 1; 1481 return 0; 1482 } 1483 1484 static bool ipv6_use_optimistic_addr(struct net *net, 1485 struct inet6_dev *idev) 1486 { 1487 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1488 if (!idev) 1489 return false; 1490 if (!net->ipv6.devconf_all->optimistic_dad && !idev->cnf.optimistic_dad) 1491 return false; 1492 if (!net->ipv6.devconf_all->use_optimistic && !idev->cnf.use_optimistic) 1493 return false; 1494 1495 return true; 1496 #else 1497 return false; 1498 #endif 1499 } 1500 1501 static bool ipv6_allow_optimistic_dad(struct net *net, 1502 struct inet6_dev *idev) 1503 { 1504 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1505 if (!idev) 1506 return false; 1507 if (!net->ipv6.devconf_all->optimistic_dad && !idev->cnf.optimistic_dad) 1508 return false; 1509 1510 return true; 1511 #else 1512 return false; 1513 #endif 1514 } 1515 1516 static int ipv6_get_saddr_eval(struct net *net, 1517 struct ipv6_saddr_score *score, 1518 struct ipv6_saddr_dst *dst, 1519 int i) 1520 { 1521 int ret; 1522 1523 if (i <= score->rule) { 1524 switch (i) { 1525 case IPV6_SADDR_RULE_SCOPE: 1526 ret = score->scopedist; 1527 break; 1528 case IPV6_SADDR_RULE_PREFIX: 1529 ret = score->matchlen; 1530 break; 1531 default: 1532 ret = !!test_bit(i, score->scorebits); 1533 } 1534 goto out; 1535 } 1536 1537 switch (i) { 1538 case IPV6_SADDR_RULE_INIT: 1539 /* Rule 0: remember if hiscore is not ready yet */ 1540 ret = !!score->ifa; 1541 break; 1542 case IPV6_SADDR_RULE_LOCAL: 1543 /* Rule 1: Prefer same address */ 1544 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr); 1545 break; 1546 case IPV6_SADDR_RULE_SCOPE: 1547 /* Rule 2: Prefer appropriate scope 1548 * 1549 * ret 1550 * ^ 1551 * -1 | d 15 1552 * ---+--+-+---> scope 1553 * | 1554 * | d is scope of the destination. 1555 * B-d | \ 1556 * | \ <- smaller scope is better if 1557 * B-15 | \ if scope is enough for destination. 1558 * | ret = B - scope (-1 <= scope >= d <= 15). 1559 * d-C-1 | / 1560 * |/ <- greater is better 1561 * -C / if scope is not enough for destination. 1562 * /| ret = scope - C (-1 <= d < scope <= 15). 1563 * 1564 * d - C - 1 < B -15 (for all -1 <= d <= 15). 1565 * C > d + 14 - B >= 15 + 14 - B = 29 - B. 1566 * Assume B = 0 and we get C > 29. 1567 */ 1568 ret = __ipv6_addr_src_scope(score->addr_type); 1569 if (ret >= dst->scope) 1570 ret = -ret; 1571 else 1572 ret -= 128; /* 30 is enough */ 1573 score->scopedist = ret; 1574 break; 1575 case IPV6_SADDR_RULE_PREFERRED: 1576 { 1577 /* Rule 3: Avoid deprecated and optimistic addresses */ 1578 u8 avoid = IFA_F_DEPRECATED; 1579 1580 if (!ipv6_use_optimistic_addr(net, score->ifa->idev)) 1581 avoid |= IFA_F_OPTIMISTIC; 1582 ret = ipv6_saddr_preferred(score->addr_type) || 1583 !(score->ifa->flags & avoid); 1584 break; 1585 } 1586 #ifdef CONFIG_IPV6_MIP6 1587 case IPV6_SADDR_RULE_HOA: 1588 { 1589 /* Rule 4: Prefer home address */ 1590 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA); 1591 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome; 1592 break; 1593 } 1594 #endif 1595 case IPV6_SADDR_RULE_OIF: 1596 /* Rule 5: Prefer outgoing interface */ 1597 ret = (!dst->ifindex || 1598 dst->ifindex == score->ifa->idev->dev->ifindex); 1599 break; 1600 case IPV6_SADDR_RULE_LABEL: 1601 /* Rule 6: Prefer matching label */ 1602 ret = ipv6_addr_label(net, 1603 &score->ifa->addr, score->addr_type, 1604 score->ifa->idev->dev->ifindex) == dst->label; 1605 break; 1606 case IPV6_SADDR_RULE_PRIVACY: 1607 { 1608 /* Rule 7: Prefer public address 1609 * Note: prefer temporary address if use_tempaddr >= 2 1610 */ 1611 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ? 1612 !!(dst->prefs & IPV6_PREFER_SRC_TMP) : 1613 score->ifa->idev->cnf.use_tempaddr >= 2; 1614 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp; 1615 break; 1616 } 1617 case IPV6_SADDR_RULE_ORCHID: 1618 /* Rule 8-: Prefer ORCHID vs ORCHID or 1619 * non-ORCHID vs non-ORCHID 1620 */ 1621 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^ 1622 ipv6_addr_orchid(dst->addr)); 1623 break; 1624 case IPV6_SADDR_RULE_PREFIX: 1625 /* Rule 8: Use longest matching prefix */ 1626 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr); 1627 if (ret > score->ifa->prefix_len) 1628 ret = score->ifa->prefix_len; 1629 score->matchlen = ret; 1630 break; 1631 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1632 case IPV6_SADDR_RULE_NOT_OPTIMISTIC: 1633 /* Optimistic addresses still have lower precedence than other 1634 * preferred addresses. 1635 */ 1636 ret = !(score->ifa->flags & IFA_F_OPTIMISTIC); 1637 break; 1638 #endif 1639 default: 1640 ret = 0; 1641 } 1642 1643 if (ret) 1644 __set_bit(i, score->scorebits); 1645 score->rule = i; 1646 out: 1647 return ret; 1648 } 1649 1650 static int __ipv6_dev_get_saddr(struct net *net, 1651 struct ipv6_saddr_dst *dst, 1652 struct inet6_dev *idev, 1653 struct ipv6_saddr_score *scores, 1654 int hiscore_idx) 1655 { 1656 struct ipv6_saddr_score *score = &scores[1 - hiscore_idx], *hiscore = &scores[hiscore_idx]; 1657 1658 list_for_each_entry_rcu(score->ifa, &idev->addr_list, if_list) { 1659 int i; 1660 1661 /* 1662 * - Tentative Address (RFC2462 section 5.4) 1663 * - A tentative address is not considered 1664 * "assigned to an interface" in the traditional 1665 * sense, unless it is also flagged as optimistic. 1666 * - Candidate Source Address (section 4) 1667 * - In any case, anycast addresses, multicast 1668 * addresses, and the unspecified address MUST 1669 * NOT be included in a candidate set. 1670 */ 1671 if ((score->ifa->flags & IFA_F_TENTATIVE) && 1672 (!(score->ifa->flags & IFA_F_OPTIMISTIC))) 1673 continue; 1674 1675 score->addr_type = __ipv6_addr_type(&score->ifa->addr); 1676 1677 if (unlikely(score->addr_type == IPV6_ADDR_ANY || 1678 score->addr_type & IPV6_ADDR_MULTICAST)) { 1679 net_dbg_ratelimited("ADDRCONF: unspecified / multicast address assigned as unicast address on %s", 1680 idev->dev->name); 1681 continue; 1682 } 1683 1684 score->rule = -1; 1685 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX); 1686 1687 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) { 1688 int minihiscore, miniscore; 1689 1690 minihiscore = ipv6_get_saddr_eval(net, hiscore, dst, i); 1691 miniscore = ipv6_get_saddr_eval(net, score, dst, i); 1692 1693 if (minihiscore > miniscore) { 1694 if (i == IPV6_SADDR_RULE_SCOPE && 1695 score->scopedist > 0) { 1696 /* 1697 * special case: 1698 * each remaining entry 1699 * has too small (not enough) 1700 * scope, because ifa entries 1701 * are sorted by their scope 1702 * values. 1703 */ 1704 goto out; 1705 } 1706 break; 1707 } else if (minihiscore < miniscore) { 1708 swap(hiscore, score); 1709 hiscore_idx = 1 - hiscore_idx; 1710 1711 /* restore our iterator */ 1712 score->ifa = hiscore->ifa; 1713 1714 break; 1715 } 1716 } 1717 } 1718 out: 1719 return hiscore_idx; 1720 } 1721 1722 static int ipv6_get_saddr_master(struct net *net, 1723 const struct net_device *dst_dev, 1724 const struct net_device *master, 1725 struct ipv6_saddr_dst *dst, 1726 struct ipv6_saddr_score *scores, 1727 int hiscore_idx) 1728 { 1729 struct inet6_dev *idev; 1730 1731 idev = __in6_dev_get(dst_dev); 1732 if (idev) 1733 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev, 1734 scores, hiscore_idx); 1735 1736 idev = __in6_dev_get(master); 1737 if (idev) 1738 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev, 1739 scores, hiscore_idx); 1740 1741 return hiscore_idx; 1742 } 1743 1744 int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev, 1745 const struct in6_addr *daddr, unsigned int prefs, 1746 struct in6_addr *saddr) 1747 { 1748 struct ipv6_saddr_score scores[2], *hiscore; 1749 struct ipv6_saddr_dst dst; 1750 struct inet6_dev *idev; 1751 struct net_device *dev; 1752 int dst_type; 1753 bool use_oif_addr = false; 1754 int hiscore_idx = 0; 1755 int ret = 0; 1756 1757 dst_type = __ipv6_addr_type(daddr); 1758 dst.addr = daddr; 1759 dst.ifindex = dst_dev ? dst_dev->ifindex : 0; 1760 dst.scope = __ipv6_addr_src_scope(dst_type); 1761 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex); 1762 dst.prefs = prefs; 1763 1764 scores[hiscore_idx].rule = -1; 1765 scores[hiscore_idx].ifa = NULL; 1766 1767 rcu_read_lock(); 1768 1769 /* Candidate Source Address (section 4) 1770 * - multicast and link-local destination address, 1771 * the set of candidate source address MUST only 1772 * include addresses assigned to interfaces 1773 * belonging to the same link as the outgoing 1774 * interface. 1775 * (- For site-local destination addresses, the 1776 * set of candidate source addresses MUST only 1777 * include addresses assigned to interfaces 1778 * belonging to the same site as the outgoing 1779 * interface.) 1780 * - "It is RECOMMENDED that the candidate source addresses 1781 * be the set of unicast addresses assigned to the 1782 * interface that will be used to send to the destination 1783 * (the 'outgoing' interface)." (RFC 6724) 1784 */ 1785 if (dst_dev) { 1786 idev = __in6_dev_get(dst_dev); 1787 if ((dst_type & IPV6_ADDR_MULTICAST) || 1788 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL || 1789 (idev && idev->cnf.use_oif_addrs_only)) { 1790 use_oif_addr = true; 1791 } 1792 } 1793 1794 if (use_oif_addr) { 1795 if (idev) 1796 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx); 1797 } else { 1798 const struct net_device *master; 1799 int master_idx = 0; 1800 1801 /* if dst_dev exists and is enslaved to an L3 device, then 1802 * prefer addresses from dst_dev and then the master over 1803 * any other enslaved devices in the L3 domain. 1804 */ 1805 master = l3mdev_master_dev_rcu(dst_dev); 1806 if (master) { 1807 master_idx = master->ifindex; 1808 1809 hiscore_idx = ipv6_get_saddr_master(net, dst_dev, 1810 master, &dst, 1811 scores, hiscore_idx); 1812 1813 if (scores[hiscore_idx].ifa) 1814 goto out; 1815 } 1816 1817 for_each_netdev_rcu(net, dev) { 1818 /* only consider addresses on devices in the 1819 * same L3 domain 1820 */ 1821 if (l3mdev_master_ifindex_rcu(dev) != master_idx) 1822 continue; 1823 idev = __in6_dev_get(dev); 1824 if (!idev) 1825 continue; 1826 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx); 1827 } 1828 } 1829 1830 out: 1831 hiscore = &scores[hiscore_idx]; 1832 if (!hiscore->ifa) 1833 ret = -EADDRNOTAVAIL; 1834 else 1835 *saddr = hiscore->ifa->addr; 1836 1837 rcu_read_unlock(); 1838 return ret; 1839 } 1840 EXPORT_SYMBOL(ipv6_dev_get_saddr); 1841 1842 int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr, 1843 u32 banned_flags) 1844 { 1845 struct inet6_ifaddr *ifp; 1846 int err = -EADDRNOTAVAIL; 1847 1848 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) { 1849 if (ifp->scope > IFA_LINK) 1850 break; 1851 if (ifp->scope == IFA_LINK && 1852 !(ifp->flags & banned_flags)) { 1853 *addr = ifp->addr; 1854 err = 0; 1855 break; 1856 } 1857 } 1858 return err; 1859 } 1860 1861 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr, 1862 u32 banned_flags) 1863 { 1864 struct inet6_dev *idev; 1865 int err = -EADDRNOTAVAIL; 1866 1867 rcu_read_lock(); 1868 idev = __in6_dev_get(dev); 1869 if (idev) { 1870 read_lock_bh(&idev->lock); 1871 err = __ipv6_get_lladdr(idev, addr, banned_flags); 1872 read_unlock_bh(&idev->lock); 1873 } 1874 rcu_read_unlock(); 1875 return err; 1876 } 1877 1878 static int ipv6_count_addresses(const struct inet6_dev *idev) 1879 { 1880 const struct inet6_ifaddr *ifp; 1881 int cnt = 0; 1882 1883 rcu_read_lock(); 1884 list_for_each_entry_rcu(ifp, &idev->addr_list, if_list) 1885 cnt++; 1886 rcu_read_unlock(); 1887 return cnt; 1888 } 1889 1890 int ipv6_chk_addr(struct net *net, const struct in6_addr *addr, 1891 const struct net_device *dev, int strict) 1892 { 1893 return ipv6_chk_addr_and_flags(net, addr, dev, !dev, 1894 strict, IFA_F_TENTATIVE); 1895 } 1896 EXPORT_SYMBOL(ipv6_chk_addr); 1897 1898 /* device argument is used to find the L3 domain of interest. If 1899 * skip_dev_check is set, then the ifp device is not checked against 1900 * the passed in dev argument. So the 2 cases for addresses checks are: 1901 * 1. does the address exist in the L3 domain that dev is part of 1902 * (skip_dev_check = true), or 1903 * 1904 * 2. does the address exist on the specific device 1905 * (skip_dev_check = false) 1906 */ 1907 int ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr, 1908 const struct net_device *dev, bool skip_dev_check, 1909 int strict, u32 banned_flags) 1910 { 1911 unsigned int hash = inet6_addr_hash(net, addr); 1912 const struct net_device *l3mdev; 1913 struct inet6_ifaddr *ifp; 1914 u32 ifp_flags; 1915 1916 rcu_read_lock(); 1917 1918 l3mdev = l3mdev_master_dev_rcu(dev); 1919 if (skip_dev_check) 1920 dev = NULL; 1921 1922 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) { 1923 if (!net_eq(dev_net(ifp->idev->dev), net)) 1924 continue; 1925 1926 if (l3mdev_master_dev_rcu(ifp->idev->dev) != l3mdev) 1927 continue; 1928 1929 /* Decouple optimistic from tentative for evaluation here. 1930 * Ban optimistic addresses explicitly, when required. 1931 */ 1932 ifp_flags = (ifp->flags&IFA_F_OPTIMISTIC) 1933 ? (ifp->flags&~IFA_F_TENTATIVE) 1934 : ifp->flags; 1935 if (ipv6_addr_equal(&ifp->addr, addr) && 1936 !(ifp_flags&banned_flags) && 1937 (!dev || ifp->idev->dev == dev || 1938 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) { 1939 rcu_read_unlock(); 1940 return 1; 1941 } 1942 } 1943 1944 rcu_read_unlock(); 1945 return 0; 1946 } 1947 EXPORT_SYMBOL(ipv6_chk_addr_and_flags); 1948 1949 1950 /* Compares an address/prefix_len with addresses on device @dev. 1951 * If one is found it returns true. 1952 */ 1953 bool ipv6_chk_custom_prefix(const struct in6_addr *addr, 1954 const unsigned int prefix_len, struct net_device *dev) 1955 { 1956 const struct inet6_ifaddr *ifa; 1957 const struct inet6_dev *idev; 1958 bool ret = false; 1959 1960 rcu_read_lock(); 1961 idev = __in6_dev_get(dev); 1962 if (idev) { 1963 list_for_each_entry_rcu(ifa, &idev->addr_list, if_list) { 1964 ret = ipv6_prefix_equal(addr, &ifa->addr, prefix_len); 1965 if (ret) 1966 break; 1967 } 1968 } 1969 rcu_read_unlock(); 1970 1971 return ret; 1972 } 1973 EXPORT_SYMBOL(ipv6_chk_custom_prefix); 1974 1975 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev) 1976 { 1977 const struct inet6_ifaddr *ifa; 1978 const struct inet6_dev *idev; 1979 int onlink; 1980 1981 onlink = 0; 1982 rcu_read_lock(); 1983 idev = __in6_dev_get(dev); 1984 if (idev) { 1985 list_for_each_entry_rcu(ifa, &idev->addr_list, if_list) { 1986 onlink = ipv6_prefix_equal(addr, &ifa->addr, 1987 ifa->prefix_len); 1988 if (onlink) 1989 break; 1990 } 1991 } 1992 rcu_read_unlock(); 1993 return onlink; 1994 } 1995 EXPORT_SYMBOL(ipv6_chk_prefix); 1996 1997 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr, 1998 struct net_device *dev, int strict) 1999 { 2000 unsigned int hash = inet6_addr_hash(net, addr); 2001 struct inet6_ifaddr *ifp, *result = NULL; 2002 2003 rcu_read_lock(); 2004 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) { 2005 if (!net_eq(dev_net(ifp->idev->dev), net)) 2006 continue; 2007 if (ipv6_addr_equal(&ifp->addr, addr)) { 2008 if (!dev || ifp->idev->dev == dev || 2009 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) { 2010 result = ifp; 2011 in6_ifa_hold(ifp); 2012 break; 2013 } 2014 } 2015 } 2016 rcu_read_unlock(); 2017 2018 return result; 2019 } 2020 2021 /* Gets referenced address, destroys ifaddr */ 2022 2023 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed) 2024 { 2025 if (dad_failed) 2026 ifp->flags |= IFA_F_DADFAILED; 2027 2028 if (ifp->flags&IFA_F_TEMPORARY) { 2029 struct inet6_ifaddr *ifpub; 2030 spin_lock_bh(&ifp->lock); 2031 ifpub = ifp->ifpub; 2032 if (ifpub) { 2033 in6_ifa_hold(ifpub); 2034 spin_unlock_bh(&ifp->lock); 2035 ipv6_create_tempaddr(ifpub, ifp, true); 2036 in6_ifa_put(ifpub); 2037 } else { 2038 spin_unlock_bh(&ifp->lock); 2039 } 2040 ipv6_del_addr(ifp); 2041 } else if (ifp->flags&IFA_F_PERMANENT || !dad_failed) { 2042 spin_lock_bh(&ifp->lock); 2043 addrconf_del_dad_work(ifp); 2044 ifp->flags |= IFA_F_TENTATIVE; 2045 if (dad_failed) 2046 ifp->flags &= ~IFA_F_OPTIMISTIC; 2047 spin_unlock_bh(&ifp->lock); 2048 if (dad_failed) 2049 ipv6_ifa_notify(0, ifp); 2050 in6_ifa_put(ifp); 2051 } else { 2052 ipv6_del_addr(ifp); 2053 } 2054 } 2055 2056 static int addrconf_dad_end(struct inet6_ifaddr *ifp) 2057 { 2058 int err = -ENOENT; 2059 2060 spin_lock_bh(&ifp->lock); 2061 if (ifp->state == INET6_IFADDR_STATE_DAD) { 2062 ifp->state = INET6_IFADDR_STATE_POSTDAD; 2063 err = 0; 2064 } 2065 spin_unlock_bh(&ifp->lock); 2066 2067 return err; 2068 } 2069 2070 void addrconf_dad_failure(struct sk_buff *skb, struct inet6_ifaddr *ifp) 2071 { 2072 struct inet6_dev *idev = ifp->idev; 2073 struct net *net = dev_net(ifp->idev->dev); 2074 2075 if (addrconf_dad_end(ifp)) { 2076 in6_ifa_put(ifp); 2077 return; 2078 } 2079 2080 net_info_ratelimited("%s: IPv6 duplicate address %pI6c used by %pM detected!\n", 2081 ifp->idev->dev->name, &ifp->addr, eth_hdr(skb)->h_source); 2082 2083 spin_lock_bh(&ifp->lock); 2084 2085 if (ifp->flags & IFA_F_STABLE_PRIVACY) { 2086 struct in6_addr new_addr; 2087 struct inet6_ifaddr *ifp2; 2088 int retries = ifp->stable_privacy_retry + 1; 2089 struct ifa6_config cfg = { 2090 .pfx = &new_addr, 2091 .plen = ifp->prefix_len, 2092 .ifa_flags = ifp->flags, 2093 .valid_lft = ifp->valid_lft, 2094 .preferred_lft = ifp->prefered_lft, 2095 .scope = ifp->scope, 2096 }; 2097 2098 if (retries > net->ipv6.sysctl.idgen_retries) { 2099 net_info_ratelimited("%s: privacy stable address generation failed because of DAD conflicts!\n", 2100 ifp->idev->dev->name); 2101 goto errdad; 2102 } 2103 2104 new_addr = ifp->addr; 2105 if (ipv6_generate_stable_address(&new_addr, retries, 2106 idev)) 2107 goto errdad; 2108 2109 spin_unlock_bh(&ifp->lock); 2110 2111 if (idev->cnf.max_addresses && 2112 ipv6_count_addresses(idev) >= 2113 idev->cnf.max_addresses) 2114 goto lock_errdad; 2115 2116 net_info_ratelimited("%s: generating new stable privacy address because of DAD conflict\n", 2117 ifp->idev->dev->name); 2118 2119 ifp2 = ipv6_add_addr(idev, &cfg, false, NULL); 2120 if (IS_ERR(ifp2)) 2121 goto lock_errdad; 2122 2123 spin_lock_bh(&ifp2->lock); 2124 ifp2->stable_privacy_retry = retries; 2125 ifp2->state = INET6_IFADDR_STATE_PREDAD; 2126 spin_unlock_bh(&ifp2->lock); 2127 2128 addrconf_mod_dad_work(ifp2, net->ipv6.sysctl.idgen_delay); 2129 in6_ifa_put(ifp2); 2130 lock_errdad: 2131 spin_lock_bh(&ifp->lock); 2132 } 2133 2134 errdad: 2135 /* transition from _POSTDAD to _ERRDAD */ 2136 ifp->state = INET6_IFADDR_STATE_ERRDAD; 2137 spin_unlock_bh(&ifp->lock); 2138 2139 addrconf_mod_dad_work(ifp, 0); 2140 in6_ifa_put(ifp); 2141 } 2142 2143 /* Join to solicited addr multicast group. 2144 * caller must hold RTNL */ 2145 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr) 2146 { 2147 struct in6_addr maddr; 2148 2149 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP)) 2150 return; 2151 2152 addrconf_addr_solict_mult(addr, &maddr); 2153 ipv6_dev_mc_inc(dev, &maddr); 2154 } 2155 2156 /* caller must hold RTNL */ 2157 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr) 2158 { 2159 struct in6_addr maddr; 2160 2161 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP)) 2162 return; 2163 2164 addrconf_addr_solict_mult(addr, &maddr); 2165 __ipv6_dev_mc_dec(idev, &maddr); 2166 } 2167 2168 /* caller must hold RTNL */ 2169 static void addrconf_join_anycast(struct inet6_ifaddr *ifp) 2170 { 2171 struct in6_addr addr; 2172 2173 if (ifp->prefix_len >= 127) /* RFC 6164 */ 2174 return; 2175 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len); 2176 if (ipv6_addr_any(&addr)) 2177 return; 2178 __ipv6_dev_ac_inc(ifp->idev, &addr); 2179 } 2180 2181 /* caller must hold RTNL */ 2182 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp) 2183 { 2184 struct in6_addr addr; 2185 2186 if (ifp->prefix_len >= 127) /* RFC 6164 */ 2187 return; 2188 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len); 2189 if (ipv6_addr_any(&addr)) 2190 return; 2191 __ipv6_dev_ac_dec(ifp->idev, &addr); 2192 } 2193 2194 static int addrconf_ifid_6lowpan(u8 *eui, struct net_device *dev) 2195 { 2196 switch (dev->addr_len) { 2197 case ETH_ALEN: 2198 memcpy(eui, dev->dev_addr, 3); 2199 eui[3] = 0xFF; 2200 eui[4] = 0xFE; 2201 memcpy(eui + 5, dev->dev_addr + 3, 3); 2202 break; 2203 case EUI64_ADDR_LEN: 2204 memcpy(eui, dev->dev_addr, EUI64_ADDR_LEN); 2205 eui[0] ^= 2; 2206 break; 2207 default: 2208 return -1; 2209 } 2210 2211 return 0; 2212 } 2213 2214 static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev) 2215 { 2216 union fwnet_hwaddr *ha; 2217 2218 if (dev->addr_len != FWNET_ALEN) 2219 return -1; 2220 2221 ha = (union fwnet_hwaddr *)dev->dev_addr; 2222 2223 memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id)); 2224 eui[0] ^= 2; 2225 return 0; 2226 } 2227 2228 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev) 2229 { 2230 /* XXX: inherit EUI-64 from other interface -- yoshfuji */ 2231 if (dev->addr_len != ARCNET_ALEN) 2232 return -1; 2233 memset(eui, 0, 7); 2234 eui[7] = *(u8 *)dev->dev_addr; 2235 return 0; 2236 } 2237 2238 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev) 2239 { 2240 if (dev->addr_len != INFINIBAND_ALEN) 2241 return -1; 2242 memcpy(eui, dev->dev_addr + 12, 8); 2243 eui[0] |= 2; 2244 return 0; 2245 } 2246 2247 static int __ipv6_isatap_ifid(u8 *eui, __be32 addr) 2248 { 2249 if (addr == 0) 2250 return -1; 2251 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) || 2252 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) || 2253 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) || 2254 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) || 2255 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) || 2256 ipv4_is_lbcast(addr)) ? 0x00 : 0x02; 2257 eui[1] = 0; 2258 eui[2] = 0x5E; 2259 eui[3] = 0xFE; 2260 memcpy(eui + 4, &addr, 4); 2261 return 0; 2262 } 2263 2264 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev) 2265 { 2266 if (dev->priv_flags & IFF_ISATAP) 2267 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr); 2268 return -1; 2269 } 2270 2271 static int addrconf_ifid_gre(u8 *eui, struct net_device *dev) 2272 { 2273 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr); 2274 } 2275 2276 static int addrconf_ifid_ip6tnl(u8 *eui, struct net_device *dev) 2277 { 2278 memcpy(eui, dev->perm_addr, 3); 2279 memcpy(eui + 5, dev->perm_addr + 3, 3); 2280 eui[3] = 0xFF; 2281 eui[4] = 0xFE; 2282 eui[0] ^= 2; 2283 return 0; 2284 } 2285 2286 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev) 2287 { 2288 switch (dev->type) { 2289 case ARPHRD_ETHER: 2290 case ARPHRD_FDDI: 2291 return addrconf_ifid_eui48(eui, dev); 2292 case ARPHRD_ARCNET: 2293 return addrconf_ifid_arcnet(eui, dev); 2294 case ARPHRD_INFINIBAND: 2295 return addrconf_ifid_infiniband(eui, dev); 2296 case ARPHRD_SIT: 2297 return addrconf_ifid_sit(eui, dev); 2298 case ARPHRD_IPGRE: 2299 case ARPHRD_TUNNEL: 2300 return addrconf_ifid_gre(eui, dev); 2301 case ARPHRD_6LOWPAN: 2302 return addrconf_ifid_6lowpan(eui, dev); 2303 case ARPHRD_IEEE1394: 2304 return addrconf_ifid_ieee1394(eui, dev); 2305 case ARPHRD_TUNNEL6: 2306 case ARPHRD_IP6GRE: 2307 case ARPHRD_RAWIP: 2308 return addrconf_ifid_ip6tnl(eui, dev); 2309 } 2310 return -1; 2311 } 2312 2313 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev) 2314 { 2315 int err = -1; 2316 struct inet6_ifaddr *ifp; 2317 2318 read_lock_bh(&idev->lock); 2319 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) { 2320 if (ifp->scope > IFA_LINK) 2321 break; 2322 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) { 2323 memcpy(eui, ifp->addr.s6_addr+8, 8); 2324 err = 0; 2325 break; 2326 } 2327 } 2328 read_unlock_bh(&idev->lock); 2329 return err; 2330 } 2331 2332 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */ 2333 static void ipv6_regen_rndid(struct inet6_dev *idev) 2334 { 2335 regen: 2336 get_random_bytes(idev->rndid, sizeof(idev->rndid)); 2337 idev->rndid[0] &= ~0x02; 2338 2339 /* 2340 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>: 2341 * check if generated address is not inappropriate 2342 * 2343 * - Reserved subnet anycast (RFC 2526) 2344 * 11111101 11....11 1xxxxxxx 2345 * - ISATAP (RFC4214) 6.1 2346 * 00-00-5E-FE-xx-xx-xx-xx 2347 * - value 0 2348 * - XXX: already assigned to an address on the device 2349 */ 2350 if (idev->rndid[0] == 0xfd && 2351 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff && 2352 (idev->rndid[7]&0x80)) 2353 goto regen; 2354 if ((idev->rndid[0]|idev->rndid[1]) == 0) { 2355 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe) 2356 goto regen; 2357 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00) 2358 goto regen; 2359 } 2360 } 2361 2362 static void ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) 2363 { 2364 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0) 2365 ipv6_regen_rndid(idev); 2366 } 2367 2368 /* 2369 * Add prefix route. 2370 */ 2371 2372 static void 2373 addrconf_prefix_route(struct in6_addr *pfx, int plen, u32 metric, 2374 struct net_device *dev, unsigned long expires, 2375 u32 flags, gfp_t gfp_flags) 2376 { 2377 struct fib6_config cfg = { 2378 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX, 2379 .fc_metric = metric ? : IP6_RT_PRIO_ADDRCONF, 2380 .fc_ifindex = dev->ifindex, 2381 .fc_expires = expires, 2382 .fc_dst_len = plen, 2383 .fc_flags = RTF_UP | flags, 2384 .fc_nlinfo.nl_net = dev_net(dev), 2385 .fc_protocol = RTPROT_KERNEL, 2386 .fc_type = RTN_UNICAST, 2387 }; 2388 2389 cfg.fc_dst = *pfx; 2390 2391 /* Prevent useless cloning on PtP SIT. 2392 This thing is done here expecting that the whole 2393 class of non-broadcast devices need not cloning. 2394 */ 2395 #if IS_ENABLED(CONFIG_IPV6_SIT) 2396 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT)) 2397 cfg.fc_flags |= RTF_NONEXTHOP; 2398 #endif 2399 2400 ip6_route_add(&cfg, gfp_flags, NULL); 2401 } 2402 2403 2404 static struct fib6_info *addrconf_get_prefix_route(const struct in6_addr *pfx, 2405 int plen, 2406 const struct net_device *dev, 2407 u32 flags, u32 noflags, 2408 bool no_gw) 2409 { 2410 struct fib6_node *fn; 2411 struct fib6_info *rt = NULL; 2412 struct fib6_table *table; 2413 u32 tb_id = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX; 2414 2415 table = fib6_get_table(dev_net(dev), tb_id); 2416 if (!table) 2417 return NULL; 2418 2419 rcu_read_lock(); 2420 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0, true); 2421 if (!fn) 2422 goto out; 2423 2424 for_each_fib6_node_rt_rcu(fn) { 2425 /* prefix routes only use builtin fib6_nh */ 2426 if (rt->nh) 2427 continue; 2428 2429 if (rt->fib6_nh->fib_nh_dev->ifindex != dev->ifindex) 2430 continue; 2431 if (no_gw && rt->fib6_nh->fib_nh_gw_family) 2432 continue; 2433 if ((rt->fib6_flags & flags) != flags) 2434 continue; 2435 if ((rt->fib6_flags & noflags) != 0) 2436 continue; 2437 if (!fib6_info_hold_safe(rt)) 2438 continue; 2439 break; 2440 } 2441 out: 2442 rcu_read_unlock(); 2443 return rt; 2444 } 2445 2446 2447 /* Create "default" multicast route to the interface */ 2448 2449 static void addrconf_add_mroute(struct net_device *dev) 2450 { 2451 struct fib6_config cfg = { 2452 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_LOCAL, 2453 .fc_metric = IP6_RT_PRIO_ADDRCONF, 2454 .fc_ifindex = dev->ifindex, 2455 .fc_dst_len = 8, 2456 .fc_flags = RTF_UP, 2457 .fc_type = RTN_UNICAST, 2458 .fc_nlinfo.nl_net = dev_net(dev), 2459 }; 2460 2461 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0); 2462 2463 ip6_route_add(&cfg, GFP_KERNEL, NULL); 2464 } 2465 2466 static struct inet6_dev *addrconf_add_dev(struct net_device *dev) 2467 { 2468 struct inet6_dev *idev; 2469 2470 ASSERT_RTNL(); 2471 2472 idev = ipv6_find_idev(dev); 2473 if (IS_ERR(idev)) 2474 return idev; 2475 2476 if (idev->cnf.disable_ipv6) 2477 return ERR_PTR(-EACCES); 2478 2479 /* Add default multicast route */ 2480 if (!(dev->flags & IFF_LOOPBACK) && !netif_is_l3_master(dev)) 2481 addrconf_add_mroute(dev); 2482 2483 return idev; 2484 } 2485 2486 static void manage_tempaddrs(struct inet6_dev *idev, 2487 struct inet6_ifaddr *ifp, 2488 __u32 valid_lft, __u32 prefered_lft, 2489 bool create, unsigned long now) 2490 { 2491 u32 flags; 2492 struct inet6_ifaddr *ift; 2493 2494 read_lock_bh(&idev->lock); 2495 /* update all temporary addresses in the list */ 2496 list_for_each_entry(ift, &idev->tempaddr_list, tmp_list) { 2497 int age, max_valid, max_prefered; 2498 2499 if (ifp != ift->ifpub) 2500 continue; 2501 2502 /* RFC 4941 section 3.3: 2503 * If a received option will extend the lifetime of a public 2504 * address, the lifetimes of temporary addresses should 2505 * be extended, subject to the overall constraint that no 2506 * temporary addresses should ever remain "valid" or "preferred" 2507 * for a time longer than (TEMP_VALID_LIFETIME) or 2508 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), respectively. 2509 */ 2510 age = (now - ift->cstamp) / HZ; 2511 max_valid = idev->cnf.temp_valid_lft - age; 2512 if (max_valid < 0) 2513 max_valid = 0; 2514 2515 max_prefered = idev->cnf.temp_prefered_lft - 2516 idev->desync_factor - age; 2517 if (max_prefered < 0) 2518 max_prefered = 0; 2519 2520 if (valid_lft > max_valid) 2521 valid_lft = max_valid; 2522 2523 if (prefered_lft > max_prefered) 2524 prefered_lft = max_prefered; 2525 2526 spin_lock(&ift->lock); 2527 flags = ift->flags; 2528 ift->valid_lft = valid_lft; 2529 ift->prefered_lft = prefered_lft; 2530 ift->tstamp = now; 2531 if (prefered_lft > 0) 2532 ift->flags &= ~IFA_F_DEPRECATED; 2533 2534 spin_unlock(&ift->lock); 2535 if (!(flags&IFA_F_TENTATIVE)) 2536 ipv6_ifa_notify(0, ift); 2537 } 2538 2539 if ((create || list_empty(&idev->tempaddr_list)) && 2540 idev->cnf.use_tempaddr > 0) { 2541 /* When a new public address is created as described 2542 * in [ADDRCONF], also create a new temporary address. 2543 * Also create a temporary address if it's enabled but 2544 * no temporary address currently exists. 2545 */ 2546 read_unlock_bh(&idev->lock); 2547 ipv6_create_tempaddr(ifp, NULL, false); 2548 } else { 2549 read_unlock_bh(&idev->lock); 2550 } 2551 } 2552 2553 static bool is_addr_mode_generate_stable(struct inet6_dev *idev) 2554 { 2555 return idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY || 2556 idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_RANDOM; 2557 } 2558 2559 int addrconf_prefix_rcv_add_addr(struct net *net, struct net_device *dev, 2560 const struct prefix_info *pinfo, 2561 struct inet6_dev *in6_dev, 2562 const struct in6_addr *addr, int addr_type, 2563 u32 addr_flags, bool sllao, bool tokenized, 2564 __u32 valid_lft, u32 prefered_lft) 2565 { 2566 struct inet6_ifaddr *ifp = ipv6_get_ifaddr(net, addr, dev, 1); 2567 int create = 0, update_lft = 0; 2568 2569 if (!ifp && valid_lft) { 2570 int max_addresses = in6_dev->cnf.max_addresses; 2571 struct ifa6_config cfg = { 2572 .pfx = addr, 2573 .plen = pinfo->prefix_len, 2574 .ifa_flags = addr_flags, 2575 .valid_lft = valid_lft, 2576 .preferred_lft = prefered_lft, 2577 .scope = addr_type & IPV6_ADDR_SCOPE_MASK, 2578 }; 2579 2580 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 2581 if ((net->ipv6.devconf_all->optimistic_dad || 2582 in6_dev->cnf.optimistic_dad) && 2583 !net->ipv6.devconf_all->forwarding && sllao) 2584 cfg.ifa_flags |= IFA_F_OPTIMISTIC; 2585 #endif 2586 2587 /* Do not allow to create too much of autoconfigured 2588 * addresses; this would be too easy way to crash kernel. 2589 */ 2590 if (!max_addresses || 2591 ipv6_count_addresses(in6_dev) < max_addresses) 2592 ifp = ipv6_add_addr(in6_dev, &cfg, false, NULL); 2593 2594 if (IS_ERR_OR_NULL(ifp)) 2595 return -1; 2596 2597 create = 1; 2598 spin_lock_bh(&ifp->lock); 2599 ifp->flags |= IFA_F_MANAGETEMPADDR; 2600 ifp->cstamp = jiffies; 2601 ifp->tokenized = tokenized; 2602 spin_unlock_bh(&ifp->lock); 2603 addrconf_dad_start(ifp); 2604 } 2605 2606 if (ifp) { 2607 u32 flags; 2608 unsigned long now; 2609 u32 stored_lft; 2610 2611 /* update lifetime (RFC2462 5.5.3 e) */ 2612 spin_lock_bh(&ifp->lock); 2613 now = jiffies; 2614 if (ifp->valid_lft > (now - ifp->tstamp) / HZ) 2615 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ; 2616 else 2617 stored_lft = 0; 2618 if (!create && stored_lft) { 2619 const u32 minimum_lft = min_t(u32, 2620 stored_lft, MIN_VALID_LIFETIME); 2621 valid_lft = max(valid_lft, minimum_lft); 2622 2623 /* RFC4862 Section 5.5.3e: 2624 * "Note that the preferred lifetime of the 2625 * corresponding address is always reset to 2626 * the Preferred Lifetime in the received 2627 * Prefix Information option, regardless of 2628 * whether the valid lifetime is also reset or 2629 * ignored." 2630 * 2631 * So we should always update prefered_lft here. 2632 */ 2633 update_lft = 1; 2634 } 2635 2636 if (update_lft) { 2637 ifp->valid_lft = valid_lft; 2638 ifp->prefered_lft = prefered_lft; 2639 ifp->tstamp = now; 2640 flags = ifp->flags; 2641 ifp->flags &= ~IFA_F_DEPRECATED; 2642 spin_unlock_bh(&ifp->lock); 2643 2644 if (!(flags&IFA_F_TENTATIVE)) 2645 ipv6_ifa_notify(0, ifp); 2646 } else 2647 spin_unlock_bh(&ifp->lock); 2648 2649 manage_tempaddrs(in6_dev, ifp, valid_lft, prefered_lft, 2650 create, now); 2651 2652 in6_ifa_put(ifp); 2653 addrconf_verify(); 2654 } 2655 2656 return 0; 2657 } 2658 EXPORT_SYMBOL_GPL(addrconf_prefix_rcv_add_addr); 2659 2660 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao) 2661 { 2662 struct prefix_info *pinfo; 2663 __u32 valid_lft; 2664 __u32 prefered_lft; 2665 int addr_type, err; 2666 u32 addr_flags = 0; 2667 struct inet6_dev *in6_dev; 2668 struct net *net = dev_net(dev); 2669 2670 pinfo = (struct prefix_info *) opt; 2671 2672 if (len < sizeof(struct prefix_info)) { 2673 netdev_dbg(dev, "addrconf: prefix option too short\n"); 2674 return; 2675 } 2676 2677 /* 2678 * Validation checks ([ADDRCONF], page 19) 2679 */ 2680 2681 addr_type = ipv6_addr_type(&pinfo->prefix); 2682 2683 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL)) 2684 return; 2685 2686 valid_lft = ntohl(pinfo->valid); 2687 prefered_lft = ntohl(pinfo->prefered); 2688 2689 if (prefered_lft > valid_lft) { 2690 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n"); 2691 return; 2692 } 2693 2694 in6_dev = in6_dev_get(dev); 2695 2696 if (!in6_dev) { 2697 net_dbg_ratelimited("addrconf: device %s not configured\n", 2698 dev->name); 2699 return; 2700 } 2701 2702 /* 2703 * Two things going on here: 2704 * 1) Add routes for on-link prefixes 2705 * 2) Configure prefixes with the auto flag set 2706 */ 2707 2708 if (pinfo->onlink) { 2709 struct fib6_info *rt; 2710 unsigned long rt_expires; 2711 2712 /* Avoid arithmetic overflow. Really, we could 2713 * save rt_expires in seconds, likely valid_lft, 2714 * but it would require division in fib gc, that it 2715 * not good. 2716 */ 2717 if (HZ > USER_HZ) 2718 rt_expires = addrconf_timeout_fixup(valid_lft, HZ); 2719 else 2720 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ); 2721 2722 if (addrconf_finite_timeout(rt_expires)) 2723 rt_expires *= HZ; 2724 2725 rt = addrconf_get_prefix_route(&pinfo->prefix, 2726 pinfo->prefix_len, 2727 dev, 2728 RTF_ADDRCONF | RTF_PREFIX_RT, 2729 RTF_DEFAULT, true); 2730 2731 if (rt) { 2732 /* Autoconf prefix route */ 2733 if (valid_lft == 0) { 2734 ip6_del_rt(net, rt); 2735 rt = NULL; 2736 } else if (addrconf_finite_timeout(rt_expires)) { 2737 /* not infinity */ 2738 fib6_set_expires(rt, jiffies + rt_expires); 2739 } else { 2740 fib6_clean_expires(rt); 2741 } 2742 } else if (valid_lft) { 2743 clock_t expires = 0; 2744 int flags = RTF_ADDRCONF | RTF_PREFIX_RT; 2745 if (addrconf_finite_timeout(rt_expires)) { 2746 /* not infinity */ 2747 flags |= RTF_EXPIRES; 2748 expires = jiffies_to_clock_t(rt_expires); 2749 } 2750 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len, 2751 0, dev, expires, flags, 2752 GFP_ATOMIC); 2753 } 2754 fib6_info_release(rt); 2755 } 2756 2757 /* Try to figure out our local address for this prefix */ 2758 2759 if (pinfo->autoconf && in6_dev->cnf.autoconf) { 2760 struct in6_addr addr; 2761 bool tokenized = false, dev_addr_generated = false; 2762 2763 if (pinfo->prefix_len == 64) { 2764 memcpy(&addr, &pinfo->prefix, 8); 2765 2766 if (!ipv6_addr_any(&in6_dev->token)) { 2767 read_lock_bh(&in6_dev->lock); 2768 memcpy(addr.s6_addr + 8, 2769 in6_dev->token.s6_addr + 8, 8); 2770 read_unlock_bh(&in6_dev->lock); 2771 tokenized = true; 2772 } else if (is_addr_mode_generate_stable(in6_dev) && 2773 !ipv6_generate_stable_address(&addr, 0, 2774 in6_dev)) { 2775 addr_flags |= IFA_F_STABLE_PRIVACY; 2776 goto ok; 2777 } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) && 2778 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) { 2779 goto put; 2780 } else { 2781 dev_addr_generated = true; 2782 } 2783 goto ok; 2784 } 2785 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n", 2786 pinfo->prefix_len); 2787 goto put; 2788 2789 ok: 2790 err = addrconf_prefix_rcv_add_addr(net, dev, pinfo, in6_dev, 2791 &addr, addr_type, 2792 addr_flags, sllao, 2793 tokenized, valid_lft, 2794 prefered_lft); 2795 if (err) 2796 goto put; 2797 2798 /* Ignore error case here because previous prefix add addr was 2799 * successful which will be notified. 2800 */ 2801 ndisc_ops_prefix_rcv_add_addr(net, dev, pinfo, in6_dev, &addr, 2802 addr_type, addr_flags, sllao, 2803 tokenized, valid_lft, 2804 prefered_lft, 2805 dev_addr_generated); 2806 } 2807 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo); 2808 put: 2809 in6_dev_put(in6_dev); 2810 } 2811 2812 /* 2813 * Set destination address. 2814 * Special case for SIT interfaces where we create a new "virtual" 2815 * device. 2816 */ 2817 int addrconf_set_dstaddr(struct net *net, void __user *arg) 2818 { 2819 struct in6_ifreq ireq; 2820 struct net_device *dev; 2821 int err = -EINVAL; 2822 2823 rtnl_lock(); 2824 2825 err = -EFAULT; 2826 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2827 goto err_exit; 2828 2829 dev = __dev_get_by_index(net, ireq.ifr6_ifindex); 2830 2831 err = -ENODEV; 2832 if (!dev) 2833 goto err_exit; 2834 2835 #if IS_ENABLED(CONFIG_IPV6_SIT) 2836 if (dev->type == ARPHRD_SIT) { 2837 const struct net_device_ops *ops = dev->netdev_ops; 2838 struct ifreq ifr; 2839 struct ip_tunnel_parm p; 2840 2841 err = -EADDRNOTAVAIL; 2842 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4)) 2843 goto err_exit; 2844 2845 memset(&p, 0, sizeof(p)); 2846 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3]; 2847 p.iph.saddr = 0; 2848 p.iph.version = 4; 2849 p.iph.ihl = 5; 2850 p.iph.protocol = IPPROTO_IPV6; 2851 p.iph.ttl = 64; 2852 ifr.ifr_ifru.ifru_data = (__force void __user *)&p; 2853 2854 if (ops->ndo_do_ioctl) { 2855 mm_segment_t oldfs = get_fs(); 2856 2857 set_fs(KERNEL_DS); 2858 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL); 2859 set_fs(oldfs); 2860 } else 2861 err = -EOPNOTSUPP; 2862 2863 if (err == 0) { 2864 err = -ENOBUFS; 2865 dev = __dev_get_by_name(net, p.name); 2866 if (!dev) 2867 goto err_exit; 2868 err = dev_open(dev, NULL); 2869 } 2870 } 2871 #endif 2872 2873 err_exit: 2874 rtnl_unlock(); 2875 return err; 2876 } 2877 2878 static int ipv6_mc_config(struct sock *sk, bool join, 2879 const struct in6_addr *addr, int ifindex) 2880 { 2881 int ret; 2882 2883 ASSERT_RTNL(); 2884 2885 lock_sock(sk); 2886 if (join) 2887 ret = ipv6_sock_mc_join(sk, ifindex, addr); 2888 else 2889 ret = ipv6_sock_mc_drop(sk, ifindex, addr); 2890 release_sock(sk); 2891 2892 return ret; 2893 } 2894 2895 /* 2896 * Manual configuration of address on an interface 2897 */ 2898 static int inet6_addr_add(struct net *net, int ifindex, 2899 struct ifa6_config *cfg, 2900 struct netlink_ext_ack *extack) 2901 { 2902 struct inet6_ifaddr *ifp; 2903 struct inet6_dev *idev; 2904 struct net_device *dev; 2905 unsigned long timeout; 2906 clock_t expires; 2907 u32 flags; 2908 2909 ASSERT_RTNL(); 2910 2911 if (cfg->plen > 128) 2912 return -EINVAL; 2913 2914 /* check the lifetime */ 2915 if (!cfg->valid_lft || cfg->preferred_lft > cfg->valid_lft) 2916 return -EINVAL; 2917 2918 if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR && cfg->plen != 64) 2919 return -EINVAL; 2920 2921 dev = __dev_get_by_index(net, ifindex); 2922 if (!dev) 2923 return -ENODEV; 2924 2925 idev = addrconf_add_dev(dev); 2926 if (IS_ERR(idev)) 2927 return PTR_ERR(idev); 2928 2929 if (cfg->ifa_flags & IFA_F_MCAUTOJOIN) { 2930 int ret = ipv6_mc_config(net->ipv6.mc_autojoin_sk, 2931 true, cfg->pfx, ifindex); 2932 2933 if (ret < 0) 2934 return ret; 2935 } 2936 2937 cfg->scope = ipv6_addr_scope(cfg->pfx); 2938 2939 timeout = addrconf_timeout_fixup(cfg->valid_lft, HZ); 2940 if (addrconf_finite_timeout(timeout)) { 2941 expires = jiffies_to_clock_t(timeout * HZ); 2942 cfg->valid_lft = timeout; 2943 flags = RTF_EXPIRES; 2944 } else { 2945 expires = 0; 2946 flags = 0; 2947 cfg->ifa_flags |= IFA_F_PERMANENT; 2948 } 2949 2950 timeout = addrconf_timeout_fixup(cfg->preferred_lft, HZ); 2951 if (addrconf_finite_timeout(timeout)) { 2952 if (timeout == 0) 2953 cfg->ifa_flags |= IFA_F_DEPRECATED; 2954 cfg->preferred_lft = timeout; 2955 } 2956 2957 ifp = ipv6_add_addr(idev, cfg, true, extack); 2958 if (!IS_ERR(ifp)) { 2959 if (!(cfg->ifa_flags & IFA_F_NOPREFIXROUTE)) { 2960 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, 2961 ifp->rt_priority, dev, expires, 2962 flags, GFP_KERNEL); 2963 } 2964 2965 /* Send a netlink notification if DAD is enabled and 2966 * optimistic flag is not set 2967 */ 2968 if (!(ifp->flags & (IFA_F_OPTIMISTIC | IFA_F_NODAD))) 2969 ipv6_ifa_notify(0, ifp); 2970 /* 2971 * Note that section 3.1 of RFC 4429 indicates 2972 * that the Optimistic flag should not be set for 2973 * manually configured addresses 2974 */ 2975 addrconf_dad_start(ifp); 2976 if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR) 2977 manage_tempaddrs(idev, ifp, cfg->valid_lft, 2978 cfg->preferred_lft, true, jiffies); 2979 in6_ifa_put(ifp); 2980 addrconf_verify_rtnl(); 2981 return 0; 2982 } else if (cfg->ifa_flags & IFA_F_MCAUTOJOIN) { 2983 ipv6_mc_config(net->ipv6.mc_autojoin_sk, false, 2984 cfg->pfx, ifindex); 2985 } 2986 2987 return PTR_ERR(ifp); 2988 } 2989 2990 static int inet6_addr_del(struct net *net, int ifindex, u32 ifa_flags, 2991 const struct in6_addr *pfx, unsigned int plen) 2992 { 2993 struct inet6_ifaddr *ifp; 2994 struct inet6_dev *idev; 2995 struct net_device *dev; 2996 2997 if (plen > 128) 2998 return -EINVAL; 2999 3000 dev = __dev_get_by_index(net, ifindex); 3001 if (!dev) 3002 return -ENODEV; 3003 3004 idev = __in6_dev_get(dev); 3005 if (!idev) 3006 return -ENXIO; 3007 3008 read_lock_bh(&idev->lock); 3009 list_for_each_entry(ifp, &idev->addr_list, if_list) { 3010 if (ifp->prefix_len == plen && 3011 ipv6_addr_equal(pfx, &ifp->addr)) { 3012 in6_ifa_hold(ifp); 3013 read_unlock_bh(&idev->lock); 3014 3015 if (!(ifp->flags & IFA_F_TEMPORARY) && 3016 (ifa_flags & IFA_F_MANAGETEMPADDR)) 3017 manage_tempaddrs(idev, ifp, 0, 0, false, 3018 jiffies); 3019 ipv6_del_addr(ifp); 3020 addrconf_verify_rtnl(); 3021 if (ipv6_addr_is_multicast(pfx)) { 3022 ipv6_mc_config(net->ipv6.mc_autojoin_sk, 3023 false, pfx, dev->ifindex); 3024 } 3025 return 0; 3026 } 3027 } 3028 read_unlock_bh(&idev->lock); 3029 return -EADDRNOTAVAIL; 3030 } 3031 3032 3033 int addrconf_add_ifaddr(struct net *net, void __user *arg) 3034 { 3035 struct ifa6_config cfg = { 3036 .ifa_flags = IFA_F_PERMANENT, 3037 .preferred_lft = INFINITY_LIFE_TIME, 3038 .valid_lft = INFINITY_LIFE_TIME, 3039 }; 3040 struct in6_ifreq ireq; 3041 int err; 3042 3043 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 3044 return -EPERM; 3045 3046 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 3047 return -EFAULT; 3048 3049 cfg.pfx = &ireq.ifr6_addr; 3050 cfg.plen = ireq.ifr6_prefixlen; 3051 3052 rtnl_lock(); 3053 err = inet6_addr_add(net, ireq.ifr6_ifindex, &cfg, NULL); 3054 rtnl_unlock(); 3055 return err; 3056 } 3057 3058 int addrconf_del_ifaddr(struct net *net, void __user *arg) 3059 { 3060 struct in6_ifreq ireq; 3061 int err; 3062 3063 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 3064 return -EPERM; 3065 3066 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 3067 return -EFAULT; 3068 3069 rtnl_lock(); 3070 err = inet6_addr_del(net, ireq.ifr6_ifindex, 0, &ireq.ifr6_addr, 3071 ireq.ifr6_prefixlen); 3072 rtnl_unlock(); 3073 return err; 3074 } 3075 3076 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr, 3077 int plen, int scope) 3078 { 3079 struct inet6_ifaddr *ifp; 3080 struct ifa6_config cfg = { 3081 .pfx = addr, 3082 .plen = plen, 3083 .ifa_flags = IFA_F_PERMANENT, 3084 .valid_lft = INFINITY_LIFE_TIME, 3085 .preferred_lft = INFINITY_LIFE_TIME, 3086 .scope = scope 3087 }; 3088 3089 ifp = ipv6_add_addr(idev, &cfg, true, NULL); 3090 if (!IS_ERR(ifp)) { 3091 spin_lock_bh(&ifp->lock); 3092 ifp->flags &= ~IFA_F_TENTATIVE; 3093 spin_unlock_bh(&ifp->lock); 3094 rt_genid_bump_ipv6(dev_net(idev->dev)); 3095 ipv6_ifa_notify(RTM_NEWADDR, ifp); 3096 in6_ifa_put(ifp); 3097 } 3098 } 3099 3100 #if IS_ENABLED(CONFIG_IPV6_SIT) 3101 static void sit_add_v4_addrs(struct inet6_dev *idev) 3102 { 3103 struct in6_addr addr; 3104 struct net_device *dev; 3105 struct net *net = dev_net(idev->dev); 3106 int scope, plen; 3107 u32 pflags = 0; 3108 3109 ASSERT_RTNL(); 3110 3111 memset(&addr, 0, sizeof(struct in6_addr)); 3112 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4); 3113 3114 if (idev->dev->flags&IFF_POINTOPOINT) { 3115 addr.s6_addr32[0] = htonl(0xfe800000); 3116 scope = IFA_LINK; 3117 plen = 64; 3118 } else { 3119 scope = IPV6_ADDR_COMPATv4; 3120 plen = 96; 3121 pflags |= RTF_NONEXTHOP; 3122 } 3123 3124 if (addr.s6_addr32[3]) { 3125 add_addr(idev, &addr, plen, scope); 3126 addrconf_prefix_route(&addr, plen, 0, idev->dev, 0, pflags, 3127 GFP_KERNEL); 3128 return; 3129 } 3130 3131 for_each_netdev(net, dev) { 3132 struct in_device *in_dev = __in_dev_get_rtnl(dev); 3133 if (in_dev && (dev->flags & IFF_UP)) { 3134 struct in_ifaddr *ifa; 3135 int flag = scope; 3136 3137 in_dev_for_each_ifa_rtnl(ifa, in_dev) { 3138 addr.s6_addr32[3] = ifa->ifa_local; 3139 3140 if (ifa->ifa_scope == RT_SCOPE_LINK) 3141 continue; 3142 if (ifa->ifa_scope >= RT_SCOPE_HOST) { 3143 if (idev->dev->flags&IFF_POINTOPOINT) 3144 continue; 3145 flag |= IFA_HOST; 3146 } 3147 3148 add_addr(idev, &addr, plen, flag); 3149 addrconf_prefix_route(&addr, plen, 0, idev->dev, 3150 0, pflags, GFP_KERNEL); 3151 } 3152 } 3153 } 3154 } 3155 #endif 3156 3157 static void init_loopback(struct net_device *dev) 3158 { 3159 struct inet6_dev *idev; 3160 3161 /* ::1 */ 3162 3163 ASSERT_RTNL(); 3164 3165 idev = ipv6_find_idev(dev); 3166 if (IS_ERR(idev)) { 3167 pr_debug("%s: add_dev failed\n", __func__); 3168 return; 3169 } 3170 3171 add_addr(idev, &in6addr_loopback, 128, IFA_HOST); 3172 } 3173 3174 void addrconf_add_linklocal(struct inet6_dev *idev, 3175 const struct in6_addr *addr, u32 flags) 3176 { 3177 struct ifa6_config cfg = { 3178 .pfx = addr, 3179 .plen = 64, 3180 .ifa_flags = flags | IFA_F_PERMANENT, 3181 .valid_lft = INFINITY_LIFE_TIME, 3182 .preferred_lft = INFINITY_LIFE_TIME, 3183 .scope = IFA_LINK 3184 }; 3185 struct inet6_ifaddr *ifp; 3186 3187 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 3188 if ((dev_net(idev->dev)->ipv6.devconf_all->optimistic_dad || 3189 idev->cnf.optimistic_dad) && 3190 !dev_net(idev->dev)->ipv6.devconf_all->forwarding) 3191 cfg.ifa_flags |= IFA_F_OPTIMISTIC; 3192 #endif 3193 3194 ifp = ipv6_add_addr(idev, &cfg, true, NULL); 3195 if (!IS_ERR(ifp)) { 3196 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, 0, idev->dev, 3197 0, 0, GFP_ATOMIC); 3198 addrconf_dad_start(ifp); 3199 in6_ifa_put(ifp); 3200 } 3201 } 3202 EXPORT_SYMBOL_GPL(addrconf_add_linklocal); 3203 3204 static bool ipv6_reserved_interfaceid(struct in6_addr address) 3205 { 3206 if ((address.s6_addr32[2] | address.s6_addr32[3]) == 0) 3207 return true; 3208 3209 if (address.s6_addr32[2] == htonl(0x02005eff) && 3210 ((address.s6_addr32[3] & htonl(0xfe000000)) == htonl(0xfe000000))) 3211 return true; 3212 3213 if (address.s6_addr32[2] == htonl(0xfdffffff) && 3214 ((address.s6_addr32[3] & htonl(0xffffff80)) == htonl(0xffffff80))) 3215 return true; 3216 3217 return false; 3218 } 3219 3220 static int ipv6_generate_stable_address(struct in6_addr *address, 3221 u8 dad_count, 3222 const struct inet6_dev *idev) 3223 { 3224 static DEFINE_SPINLOCK(lock); 3225 static __u32 digest[SHA_DIGEST_WORDS]; 3226 static __u32 workspace[SHA_WORKSPACE_WORDS]; 3227 3228 static union { 3229 char __data[SHA_MESSAGE_BYTES]; 3230 struct { 3231 struct in6_addr secret; 3232 __be32 prefix[2]; 3233 unsigned char hwaddr[MAX_ADDR_LEN]; 3234 u8 dad_count; 3235 } __packed; 3236 } data; 3237 3238 struct in6_addr secret; 3239 struct in6_addr temp; 3240 struct net *net = dev_net(idev->dev); 3241 3242 BUILD_BUG_ON(sizeof(data.__data) != sizeof(data)); 3243 3244 if (idev->cnf.stable_secret.initialized) 3245 secret = idev->cnf.stable_secret.secret; 3246 else if (net->ipv6.devconf_dflt->stable_secret.initialized) 3247 secret = net->ipv6.devconf_dflt->stable_secret.secret; 3248 else 3249 return -1; 3250 3251 retry: 3252 spin_lock_bh(&lock); 3253 3254 sha_init(digest); 3255 memset(&data, 0, sizeof(data)); 3256 memset(workspace, 0, sizeof(workspace)); 3257 memcpy(data.hwaddr, idev->dev->perm_addr, idev->dev->addr_len); 3258 data.prefix[0] = address->s6_addr32[0]; 3259 data.prefix[1] = address->s6_addr32[1]; 3260 data.secret = secret; 3261 data.dad_count = dad_count; 3262 3263 sha_transform(digest, data.__data, workspace); 3264 3265 temp = *address; 3266 temp.s6_addr32[2] = (__force __be32)digest[0]; 3267 temp.s6_addr32[3] = (__force __be32)digest[1]; 3268 3269 spin_unlock_bh(&lock); 3270 3271 if (ipv6_reserved_interfaceid(temp)) { 3272 dad_count++; 3273 if (dad_count > dev_net(idev->dev)->ipv6.sysctl.idgen_retries) 3274 return -1; 3275 goto retry; 3276 } 3277 3278 *address = temp; 3279 return 0; 3280 } 3281 3282 static void ipv6_gen_mode_random_init(struct inet6_dev *idev) 3283 { 3284 struct ipv6_stable_secret *s = &idev->cnf.stable_secret; 3285 3286 if (s->initialized) 3287 return; 3288 s = &idev->cnf.stable_secret; 3289 get_random_bytes(&s->secret, sizeof(s->secret)); 3290 s->initialized = true; 3291 } 3292 3293 static void addrconf_addr_gen(struct inet6_dev *idev, bool prefix_route) 3294 { 3295 struct in6_addr addr; 3296 3297 /* no link local addresses on L3 master devices */ 3298 if (netif_is_l3_master(idev->dev)) 3299 return; 3300 3301 /* no link local addresses on devices flagged as slaves */ 3302 if (idev->dev->flags & IFF_SLAVE) 3303 return; 3304 3305 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0); 3306 3307 switch (idev->cnf.addr_gen_mode) { 3308 case IN6_ADDR_GEN_MODE_RANDOM: 3309 ipv6_gen_mode_random_init(idev); 3310 fallthrough; 3311 case IN6_ADDR_GEN_MODE_STABLE_PRIVACY: 3312 if (!ipv6_generate_stable_address(&addr, 0, idev)) 3313 addrconf_add_linklocal(idev, &addr, 3314 IFA_F_STABLE_PRIVACY); 3315 else if (prefix_route) 3316 addrconf_prefix_route(&addr, 64, 0, idev->dev, 3317 0, 0, GFP_KERNEL); 3318 break; 3319 case IN6_ADDR_GEN_MODE_EUI64: 3320 /* addrconf_add_linklocal also adds a prefix_route and we 3321 * only need to care about prefix routes if ipv6_generate_eui64 3322 * couldn't generate one. 3323 */ 3324 if (ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) == 0) 3325 addrconf_add_linklocal(idev, &addr, 0); 3326 else if (prefix_route) 3327 addrconf_prefix_route(&addr, 64, 0, idev->dev, 3328 0, 0, GFP_KERNEL); 3329 break; 3330 case IN6_ADDR_GEN_MODE_NONE: 3331 default: 3332 /* will not add any link local address */ 3333 break; 3334 } 3335 } 3336 3337 static void addrconf_dev_config(struct net_device *dev) 3338 { 3339 struct inet6_dev *idev; 3340 3341 ASSERT_RTNL(); 3342 3343 if ((dev->type != ARPHRD_ETHER) && 3344 (dev->type != ARPHRD_FDDI) && 3345 (dev->type != ARPHRD_ARCNET) && 3346 (dev->type != ARPHRD_INFINIBAND) && 3347 (dev->type != ARPHRD_IEEE1394) && 3348 (dev->type != ARPHRD_TUNNEL6) && 3349 (dev->type != ARPHRD_6LOWPAN) && 3350 (dev->type != ARPHRD_IP6GRE) && 3351 (dev->type != ARPHRD_IPGRE) && 3352 (dev->type != ARPHRD_TUNNEL) && 3353 (dev->type != ARPHRD_NONE) && 3354 (dev->type != ARPHRD_RAWIP)) { 3355 /* Alas, we support only Ethernet autoconfiguration. */ 3356 idev = __in6_dev_get(dev); 3357 if (!IS_ERR_OR_NULL(idev) && dev->flags & IFF_UP && 3358 dev->flags & IFF_MULTICAST) 3359 ipv6_mc_up(idev); 3360 return; 3361 } 3362 3363 idev = addrconf_add_dev(dev); 3364 if (IS_ERR(idev)) 3365 return; 3366 3367 /* this device type has no EUI support */ 3368 if (dev->type == ARPHRD_NONE && 3369 idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_EUI64) 3370 idev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_RANDOM; 3371 3372 addrconf_addr_gen(idev, false); 3373 } 3374 3375 #if IS_ENABLED(CONFIG_IPV6_SIT) 3376 static void addrconf_sit_config(struct net_device *dev) 3377 { 3378 struct inet6_dev *idev; 3379 3380 ASSERT_RTNL(); 3381 3382 /* 3383 * Configure the tunnel with one of our IPv4 3384 * addresses... we should configure all of 3385 * our v4 addrs in the tunnel 3386 */ 3387 3388 idev = ipv6_find_idev(dev); 3389 if (IS_ERR(idev)) { 3390 pr_debug("%s: add_dev failed\n", __func__); 3391 return; 3392 } 3393 3394 if (dev->priv_flags & IFF_ISATAP) { 3395 addrconf_addr_gen(idev, false); 3396 return; 3397 } 3398 3399 sit_add_v4_addrs(idev); 3400 3401 if (dev->flags&IFF_POINTOPOINT) 3402 addrconf_add_mroute(dev); 3403 } 3404 #endif 3405 3406 #if IS_ENABLED(CONFIG_NET_IPGRE) 3407 static void addrconf_gre_config(struct net_device *dev) 3408 { 3409 struct inet6_dev *idev; 3410 3411 ASSERT_RTNL(); 3412 3413 idev = ipv6_find_idev(dev); 3414 if (IS_ERR(idev)) { 3415 pr_debug("%s: add_dev failed\n", __func__); 3416 return; 3417 } 3418 3419 addrconf_addr_gen(idev, true); 3420 if (dev->flags & IFF_POINTOPOINT) 3421 addrconf_add_mroute(dev); 3422 } 3423 #endif 3424 3425 static int fixup_permanent_addr(struct net *net, 3426 struct inet6_dev *idev, 3427 struct inet6_ifaddr *ifp) 3428 { 3429 /* !fib6_node means the host route was removed from the 3430 * FIB, for example, if 'lo' device is taken down. In that 3431 * case regenerate the host route. 3432 */ 3433 if (!ifp->rt || !ifp->rt->fib6_node) { 3434 struct fib6_info *f6i, *prev; 3435 3436 f6i = addrconf_f6i_alloc(net, idev, &ifp->addr, false, 3437 GFP_ATOMIC); 3438 if (IS_ERR(f6i)) 3439 return PTR_ERR(f6i); 3440 3441 /* ifp->rt can be accessed outside of rtnl */ 3442 spin_lock(&ifp->lock); 3443 prev = ifp->rt; 3444 ifp->rt = f6i; 3445 spin_unlock(&ifp->lock); 3446 3447 fib6_info_release(prev); 3448 } 3449 3450 if (!(ifp->flags & IFA_F_NOPREFIXROUTE)) { 3451 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, 3452 ifp->rt_priority, idev->dev, 0, 0, 3453 GFP_ATOMIC); 3454 } 3455 3456 if (ifp->state == INET6_IFADDR_STATE_PREDAD) 3457 addrconf_dad_start(ifp); 3458 3459 return 0; 3460 } 3461 3462 static void addrconf_permanent_addr(struct net *net, struct net_device *dev) 3463 { 3464 struct inet6_ifaddr *ifp, *tmp; 3465 struct inet6_dev *idev; 3466 3467 idev = __in6_dev_get(dev); 3468 if (!idev) 3469 return; 3470 3471 write_lock_bh(&idev->lock); 3472 3473 list_for_each_entry_safe(ifp, tmp, &idev->addr_list, if_list) { 3474 if ((ifp->flags & IFA_F_PERMANENT) && 3475 fixup_permanent_addr(net, idev, ifp) < 0) { 3476 write_unlock_bh(&idev->lock); 3477 in6_ifa_hold(ifp); 3478 ipv6_del_addr(ifp); 3479 write_lock_bh(&idev->lock); 3480 3481 net_info_ratelimited("%s: Failed to add prefix route for address %pI6c; dropping\n", 3482 idev->dev->name, &ifp->addr); 3483 } 3484 } 3485 3486 write_unlock_bh(&idev->lock); 3487 } 3488 3489 static int addrconf_notify(struct notifier_block *this, unsigned long event, 3490 void *ptr) 3491 { 3492 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 3493 struct netdev_notifier_change_info *change_info; 3494 struct netdev_notifier_changeupper_info *info; 3495 struct inet6_dev *idev = __in6_dev_get(dev); 3496 struct net *net = dev_net(dev); 3497 int run_pending = 0; 3498 int err; 3499 3500 switch (event) { 3501 case NETDEV_REGISTER: 3502 if (!idev && dev->mtu >= IPV6_MIN_MTU) { 3503 idev = ipv6_add_dev(dev); 3504 if (IS_ERR(idev)) 3505 return notifier_from_errno(PTR_ERR(idev)); 3506 } 3507 break; 3508 3509 case NETDEV_CHANGEMTU: 3510 /* if MTU under IPV6_MIN_MTU stop IPv6 on this interface. */ 3511 if (dev->mtu < IPV6_MIN_MTU) { 3512 addrconf_ifdown(dev, dev != net->loopback_dev); 3513 break; 3514 } 3515 3516 if (idev) { 3517 rt6_mtu_change(dev, dev->mtu); 3518 idev->cnf.mtu6 = dev->mtu; 3519 break; 3520 } 3521 3522 /* allocate new idev */ 3523 idev = ipv6_add_dev(dev); 3524 if (IS_ERR(idev)) 3525 break; 3526 3527 /* device is still not ready */ 3528 if (!(idev->if_flags & IF_READY)) 3529 break; 3530 3531 run_pending = 1; 3532 fallthrough; 3533 case NETDEV_UP: 3534 case NETDEV_CHANGE: 3535 if (dev->flags & IFF_SLAVE) 3536 break; 3537 3538 if (idev && idev->cnf.disable_ipv6) 3539 break; 3540 3541 if (event == NETDEV_UP) { 3542 /* restore routes for permanent addresses */ 3543 addrconf_permanent_addr(net, dev); 3544 3545 if (!addrconf_link_ready(dev)) { 3546 /* device is not ready yet. */ 3547 pr_debug("ADDRCONF(NETDEV_UP): %s: link is not ready\n", 3548 dev->name); 3549 break; 3550 } 3551 3552 if (!idev && dev->mtu >= IPV6_MIN_MTU) 3553 idev = ipv6_add_dev(dev); 3554 3555 if (!IS_ERR_OR_NULL(idev)) { 3556 idev->if_flags |= IF_READY; 3557 run_pending = 1; 3558 } 3559 } else if (event == NETDEV_CHANGE) { 3560 if (!addrconf_link_ready(dev)) { 3561 /* device is still not ready. */ 3562 rt6_sync_down_dev(dev, event); 3563 break; 3564 } 3565 3566 if (!IS_ERR_OR_NULL(idev)) { 3567 if (idev->if_flags & IF_READY) { 3568 /* device is already configured - 3569 * but resend MLD reports, we might 3570 * have roamed and need to update 3571 * multicast snooping switches 3572 */ 3573 ipv6_mc_up(idev); 3574 change_info = ptr; 3575 if (change_info->flags_changed & IFF_NOARP) 3576 addrconf_dad_run(idev, true); 3577 rt6_sync_up(dev, RTNH_F_LINKDOWN); 3578 break; 3579 } 3580 idev->if_flags |= IF_READY; 3581 } 3582 3583 pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n", 3584 dev->name); 3585 3586 run_pending = 1; 3587 } 3588 3589 switch (dev->type) { 3590 #if IS_ENABLED(CONFIG_IPV6_SIT) 3591 case ARPHRD_SIT: 3592 addrconf_sit_config(dev); 3593 break; 3594 #endif 3595 #if IS_ENABLED(CONFIG_NET_IPGRE) 3596 case ARPHRD_IPGRE: 3597 addrconf_gre_config(dev); 3598 break; 3599 #endif 3600 case ARPHRD_LOOPBACK: 3601 init_loopback(dev); 3602 break; 3603 3604 default: 3605 addrconf_dev_config(dev); 3606 break; 3607 } 3608 3609 if (!IS_ERR_OR_NULL(idev)) { 3610 if (run_pending) 3611 addrconf_dad_run(idev, false); 3612 3613 /* Device has an address by now */ 3614 rt6_sync_up(dev, RTNH_F_DEAD); 3615 3616 /* 3617 * If the MTU changed during the interface down, 3618 * when the interface up, the changed MTU must be 3619 * reflected in the idev as well as routers. 3620 */ 3621 if (idev->cnf.mtu6 != dev->mtu && 3622 dev->mtu >= IPV6_MIN_MTU) { 3623 rt6_mtu_change(dev, dev->mtu); 3624 idev->cnf.mtu6 = dev->mtu; 3625 } 3626 idev->tstamp = jiffies; 3627 inet6_ifinfo_notify(RTM_NEWLINK, idev); 3628 3629 /* 3630 * If the changed mtu during down is lower than 3631 * IPV6_MIN_MTU stop IPv6 on this interface. 3632 */ 3633 if (dev->mtu < IPV6_MIN_MTU) 3634 addrconf_ifdown(dev, dev != net->loopback_dev); 3635 } 3636 break; 3637 3638 case NETDEV_DOWN: 3639 case NETDEV_UNREGISTER: 3640 /* 3641 * Remove all addresses from this interface. 3642 */ 3643 addrconf_ifdown(dev, event != NETDEV_DOWN); 3644 break; 3645 3646 case NETDEV_CHANGENAME: 3647 if (idev) { 3648 snmp6_unregister_dev(idev); 3649 addrconf_sysctl_unregister(idev); 3650 err = addrconf_sysctl_register(idev); 3651 if (err) 3652 return notifier_from_errno(err); 3653 err = snmp6_register_dev(idev); 3654 if (err) { 3655 addrconf_sysctl_unregister(idev); 3656 return notifier_from_errno(err); 3657 } 3658 } 3659 break; 3660 3661 case NETDEV_PRE_TYPE_CHANGE: 3662 case NETDEV_POST_TYPE_CHANGE: 3663 if (idev) 3664 addrconf_type_change(dev, event); 3665 break; 3666 3667 case NETDEV_CHANGEUPPER: 3668 info = ptr; 3669 3670 /* flush all routes if dev is linked to or unlinked from 3671 * an L3 master device (e.g., VRF) 3672 */ 3673 if (info->upper_dev && netif_is_l3_master(info->upper_dev)) 3674 addrconf_ifdown(dev, 0); 3675 } 3676 3677 return NOTIFY_OK; 3678 } 3679 3680 /* 3681 * addrconf module should be notified of a device going up 3682 */ 3683 static struct notifier_block ipv6_dev_notf = { 3684 .notifier_call = addrconf_notify, 3685 .priority = ADDRCONF_NOTIFY_PRIORITY, 3686 }; 3687 3688 static void addrconf_type_change(struct net_device *dev, unsigned long event) 3689 { 3690 struct inet6_dev *idev; 3691 ASSERT_RTNL(); 3692 3693 idev = __in6_dev_get(dev); 3694 3695 if (event == NETDEV_POST_TYPE_CHANGE) 3696 ipv6_mc_remap(idev); 3697 else if (event == NETDEV_PRE_TYPE_CHANGE) 3698 ipv6_mc_unmap(idev); 3699 } 3700 3701 static bool addr_is_local(const struct in6_addr *addr) 3702 { 3703 return ipv6_addr_type(addr) & 3704 (IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK); 3705 } 3706 3707 static int addrconf_ifdown(struct net_device *dev, int how) 3708 { 3709 unsigned long event = how ? NETDEV_UNREGISTER : NETDEV_DOWN; 3710 struct net *net = dev_net(dev); 3711 struct inet6_dev *idev; 3712 struct inet6_ifaddr *ifa, *tmp; 3713 bool keep_addr = false; 3714 int state, i; 3715 3716 ASSERT_RTNL(); 3717 3718 rt6_disable_ip(dev, event); 3719 3720 idev = __in6_dev_get(dev); 3721 if (!idev) 3722 return -ENODEV; 3723 3724 /* 3725 * Step 1: remove reference to ipv6 device from parent device. 3726 * Do not dev_put! 3727 */ 3728 if (how) { 3729 idev->dead = 1; 3730 3731 /* protected by rtnl_lock */ 3732 RCU_INIT_POINTER(dev->ip6_ptr, NULL); 3733 3734 /* Step 1.5: remove snmp6 entry */ 3735 snmp6_unregister_dev(idev); 3736 3737 } 3738 3739 /* combine the user config with event to determine if permanent 3740 * addresses are to be removed from address hash table 3741 */ 3742 if (!how && !idev->cnf.disable_ipv6) { 3743 /* aggregate the system setting and interface setting */ 3744 int _keep_addr = net->ipv6.devconf_all->keep_addr_on_down; 3745 3746 if (!_keep_addr) 3747 _keep_addr = idev->cnf.keep_addr_on_down; 3748 3749 keep_addr = (_keep_addr > 0); 3750 } 3751 3752 /* Step 2: clear hash table */ 3753 for (i = 0; i < IN6_ADDR_HSIZE; i++) { 3754 struct hlist_head *h = &inet6_addr_lst[i]; 3755 3756 spin_lock_bh(&addrconf_hash_lock); 3757 restart: 3758 hlist_for_each_entry_rcu(ifa, h, addr_lst) { 3759 if (ifa->idev == idev) { 3760 addrconf_del_dad_work(ifa); 3761 /* combined flag + permanent flag decide if 3762 * address is retained on a down event 3763 */ 3764 if (!keep_addr || 3765 !(ifa->flags & IFA_F_PERMANENT) || 3766 addr_is_local(&ifa->addr)) { 3767 hlist_del_init_rcu(&ifa->addr_lst); 3768 goto restart; 3769 } 3770 } 3771 } 3772 spin_unlock_bh(&addrconf_hash_lock); 3773 } 3774 3775 write_lock_bh(&idev->lock); 3776 3777 addrconf_del_rs_timer(idev); 3778 3779 /* Step 2: clear flags for stateless addrconf */ 3780 if (!how) 3781 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY); 3782 3783 /* Step 3: clear tempaddr list */ 3784 while (!list_empty(&idev->tempaddr_list)) { 3785 ifa = list_first_entry(&idev->tempaddr_list, 3786 struct inet6_ifaddr, tmp_list); 3787 list_del(&ifa->tmp_list); 3788 write_unlock_bh(&idev->lock); 3789 spin_lock_bh(&ifa->lock); 3790 3791 if (ifa->ifpub) { 3792 in6_ifa_put(ifa->ifpub); 3793 ifa->ifpub = NULL; 3794 } 3795 spin_unlock_bh(&ifa->lock); 3796 in6_ifa_put(ifa); 3797 write_lock_bh(&idev->lock); 3798 } 3799 3800 list_for_each_entry_safe(ifa, tmp, &idev->addr_list, if_list) { 3801 struct fib6_info *rt = NULL; 3802 bool keep; 3803 3804 addrconf_del_dad_work(ifa); 3805 3806 keep = keep_addr && (ifa->flags & IFA_F_PERMANENT) && 3807 !addr_is_local(&ifa->addr); 3808 3809 write_unlock_bh(&idev->lock); 3810 spin_lock_bh(&ifa->lock); 3811 3812 if (keep) { 3813 /* set state to skip the notifier below */ 3814 state = INET6_IFADDR_STATE_DEAD; 3815 ifa->state = INET6_IFADDR_STATE_PREDAD; 3816 if (!(ifa->flags & IFA_F_NODAD)) 3817 ifa->flags |= IFA_F_TENTATIVE; 3818 3819 rt = ifa->rt; 3820 ifa->rt = NULL; 3821 } else { 3822 state = ifa->state; 3823 ifa->state = INET6_IFADDR_STATE_DEAD; 3824 } 3825 3826 spin_unlock_bh(&ifa->lock); 3827 3828 if (rt) 3829 ip6_del_rt(net, rt); 3830 3831 if (state != INET6_IFADDR_STATE_DEAD) { 3832 __ipv6_ifa_notify(RTM_DELADDR, ifa); 3833 inet6addr_notifier_call_chain(NETDEV_DOWN, ifa); 3834 } else { 3835 if (idev->cnf.forwarding) 3836 addrconf_leave_anycast(ifa); 3837 addrconf_leave_solict(ifa->idev, &ifa->addr); 3838 } 3839 3840 write_lock_bh(&idev->lock); 3841 if (!keep) { 3842 list_del_rcu(&ifa->if_list); 3843 in6_ifa_put(ifa); 3844 } 3845 } 3846 3847 write_unlock_bh(&idev->lock); 3848 3849 /* Step 5: Discard anycast and multicast list */ 3850 if (how) { 3851 ipv6_ac_destroy_dev(idev); 3852 ipv6_mc_destroy_dev(idev); 3853 } else { 3854 ipv6_mc_down(idev); 3855 } 3856 3857 idev->tstamp = jiffies; 3858 3859 /* Last: Shot the device (if unregistered) */ 3860 if (how) { 3861 addrconf_sysctl_unregister(idev); 3862 neigh_parms_release(&nd_tbl, idev->nd_parms); 3863 neigh_ifdown(&nd_tbl, dev); 3864 in6_dev_put(idev); 3865 } 3866 return 0; 3867 } 3868 3869 static void addrconf_rs_timer(struct timer_list *t) 3870 { 3871 struct inet6_dev *idev = from_timer(idev, t, rs_timer); 3872 struct net_device *dev = idev->dev; 3873 struct in6_addr lladdr; 3874 3875 write_lock(&idev->lock); 3876 if (idev->dead || !(idev->if_flags & IF_READY)) 3877 goto out; 3878 3879 if (!ipv6_accept_ra(idev)) 3880 goto out; 3881 3882 /* Announcement received after solicitation was sent */ 3883 if (idev->if_flags & IF_RA_RCVD) 3884 goto out; 3885 3886 if (idev->rs_probes++ < idev->cnf.rtr_solicits || idev->cnf.rtr_solicits < 0) { 3887 write_unlock(&idev->lock); 3888 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE)) 3889 ndisc_send_rs(dev, &lladdr, 3890 &in6addr_linklocal_allrouters); 3891 else 3892 goto put; 3893 3894 write_lock(&idev->lock); 3895 idev->rs_interval = rfc3315_s14_backoff_update( 3896 idev->rs_interval, idev->cnf.rtr_solicit_max_interval); 3897 /* The wait after the last probe can be shorter */ 3898 addrconf_mod_rs_timer(idev, (idev->rs_probes == 3899 idev->cnf.rtr_solicits) ? 3900 idev->cnf.rtr_solicit_delay : 3901 idev->rs_interval); 3902 } else { 3903 /* 3904 * Note: we do not support deprecated "all on-link" 3905 * assumption any longer. 3906 */ 3907 pr_debug("%s: no IPv6 routers present\n", idev->dev->name); 3908 } 3909 3910 out: 3911 write_unlock(&idev->lock); 3912 put: 3913 in6_dev_put(idev); 3914 } 3915 3916 /* 3917 * Duplicate Address Detection 3918 */ 3919 static void addrconf_dad_kick(struct inet6_ifaddr *ifp) 3920 { 3921 unsigned long rand_num; 3922 struct inet6_dev *idev = ifp->idev; 3923 u64 nonce; 3924 3925 if (ifp->flags & IFA_F_OPTIMISTIC) 3926 rand_num = 0; 3927 else 3928 rand_num = prandom_u32() % (idev->cnf.rtr_solicit_delay ? : 1); 3929 3930 nonce = 0; 3931 if (idev->cnf.enhanced_dad || 3932 dev_net(idev->dev)->ipv6.devconf_all->enhanced_dad) { 3933 do 3934 get_random_bytes(&nonce, 6); 3935 while (nonce == 0); 3936 } 3937 ifp->dad_nonce = nonce; 3938 ifp->dad_probes = idev->cnf.dad_transmits; 3939 addrconf_mod_dad_work(ifp, rand_num); 3940 } 3941 3942 static void addrconf_dad_begin(struct inet6_ifaddr *ifp) 3943 { 3944 struct inet6_dev *idev = ifp->idev; 3945 struct net_device *dev = idev->dev; 3946 bool bump_id, notify = false; 3947 struct net *net; 3948 3949 addrconf_join_solict(dev, &ifp->addr); 3950 3951 prandom_seed((__force u32) ifp->addr.s6_addr32[3]); 3952 3953 read_lock_bh(&idev->lock); 3954 spin_lock(&ifp->lock); 3955 if (ifp->state == INET6_IFADDR_STATE_DEAD) 3956 goto out; 3957 3958 net = dev_net(dev); 3959 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) || 3960 (net->ipv6.devconf_all->accept_dad < 1 && 3961 idev->cnf.accept_dad < 1) || 3962 !(ifp->flags&IFA_F_TENTATIVE) || 3963 ifp->flags & IFA_F_NODAD) { 3964 bool send_na = false; 3965 3966 if (ifp->flags & IFA_F_TENTATIVE && 3967 !(ifp->flags & IFA_F_OPTIMISTIC)) 3968 send_na = true; 3969 bump_id = ifp->flags & IFA_F_TENTATIVE; 3970 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED); 3971 spin_unlock(&ifp->lock); 3972 read_unlock_bh(&idev->lock); 3973 3974 addrconf_dad_completed(ifp, bump_id, send_na); 3975 return; 3976 } 3977 3978 if (!(idev->if_flags & IF_READY)) { 3979 spin_unlock(&ifp->lock); 3980 read_unlock_bh(&idev->lock); 3981 /* 3982 * If the device is not ready: 3983 * - keep it tentative if it is a permanent address. 3984 * - otherwise, kill it. 3985 */ 3986 in6_ifa_hold(ifp); 3987 addrconf_dad_stop(ifp, 0); 3988 return; 3989 } 3990 3991 /* 3992 * Optimistic nodes can start receiving 3993 * Frames right away 3994 */ 3995 if (ifp->flags & IFA_F_OPTIMISTIC) { 3996 ip6_ins_rt(net, ifp->rt); 3997 if (ipv6_use_optimistic_addr(net, idev)) { 3998 /* Because optimistic nodes can use this address, 3999 * notify listeners. If DAD fails, RTM_DELADDR is sent. 4000 */ 4001 notify = true; 4002 } 4003 } 4004 4005 addrconf_dad_kick(ifp); 4006 out: 4007 spin_unlock(&ifp->lock); 4008 read_unlock_bh(&idev->lock); 4009 if (notify) 4010 ipv6_ifa_notify(RTM_NEWADDR, ifp); 4011 } 4012 4013 static void addrconf_dad_start(struct inet6_ifaddr *ifp) 4014 { 4015 bool begin_dad = false; 4016 4017 spin_lock_bh(&ifp->lock); 4018 if (ifp->state != INET6_IFADDR_STATE_DEAD) { 4019 ifp->state = INET6_IFADDR_STATE_PREDAD; 4020 begin_dad = true; 4021 } 4022 spin_unlock_bh(&ifp->lock); 4023 4024 if (begin_dad) 4025 addrconf_mod_dad_work(ifp, 0); 4026 } 4027 4028 static void addrconf_dad_work(struct work_struct *w) 4029 { 4030 struct inet6_ifaddr *ifp = container_of(to_delayed_work(w), 4031 struct inet6_ifaddr, 4032 dad_work); 4033 struct inet6_dev *idev = ifp->idev; 4034 bool bump_id, disable_ipv6 = false; 4035 struct in6_addr mcaddr; 4036 4037 enum { 4038 DAD_PROCESS, 4039 DAD_BEGIN, 4040 DAD_ABORT, 4041 } action = DAD_PROCESS; 4042 4043 rtnl_lock(); 4044 4045 spin_lock_bh(&ifp->lock); 4046 if (ifp->state == INET6_IFADDR_STATE_PREDAD) { 4047 action = DAD_BEGIN; 4048 ifp->state = INET6_IFADDR_STATE_DAD; 4049 } else if (ifp->state == INET6_IFADDR_STATE_ERRDAD) { 4050 action = DAD_ABORT; 4051 ifp->state = INET6_IFADDR_STATE_POSTDAD; 4052 4053 if ((dev_net(idev->dev)->ipv6.devconf_all->accept_dad > 1 || 4054 idev->cnf.accept_dad > 1) && 4055 !idev->cnf.disable_ipv6 && 4056 !(ifp->flags & IFA_F_STABLE_PRIVACY)) { 4057 struct in6_addr addr; 4058 4059 addr.s6_addr32[0] = htonl(0xfe800000); 4060 addr.s6_addr32[1] = 0; 4061 4062 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) && 4063 ipv6_addr_equal(&ifp->addr, &addr)) { 4064 /* DAD failed for link-local based on MAC */ 4065 idev->cnf.disable_ipv6 = 1; 4066 4067 pr_info("%s: IPv6 being disabled!\n", 4068 ifp->idev->dev->name); 4069 disable_ipv6 = true; 4070 } 4071 } 4072 } 4073 spin_unlock_bh(&ifp->lock); 4074 4075 if (action == DAD_BEGIN) { 4076 addrconf_dad_begin(ifp); 4077 goto out; 4078 } else if (action == DAD_ABORT) { 4079 in6_ifa_hold(ifp); 4080 addrconf_dad_stop(ifp, 1); 4081 if (disable_ipv6) 4082 addrconf_ifdown(idev->dev, 0); 4083 goto out; 4084 } 4085 4086 if (!ifp->dad_probes && addrconf_dad_end(ifp)) 4087 goto out; 4088 4089 write_lock_bh(&idev->lock); 4090 if (idev->dead || !(idev->if_flags & IF_READY)) { 4091 write_unlock_bh(&idev->lock); 4092 goto out; 4093 } 4094 4095 spin_lock(&ifp->lock); 4096 if (ifp->state == INET6_IFADDR_STATE_DEAD) { 4097 spin_unlock(&ifp->lock); 4098 write_unlock_bh(&idev->lock); 4099 goto out; 4100 } 4101 4102 if (ifp->dad_probes == 0) { 4103 bool send_na = false; 4104 4105 /* 4106 * DAD was successful 4107 */ 4108 4109 if (ifp->flags & IFA_F_TENTATIVE && 4110 !(ifp->flags & IFA_F_OPTIMISTIC)) 4111 send_na = true; 4112 bump_id = ifp->flags & IFA_F_TENTATIVE; 4113 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED); 4114 spin_unlock(&ifp->lock); 4115 write_unlock_bh(&idev->lock); 4116 4117 addrconf_dad_completed(ifp, bump_id, send_na); 4118 4119 goto out; 4120 } 4121 4122 ifp->dad_probes--; 4123 addrconf_mod_dad_work(ifp, 4124 max(NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME), 4125 HZ/100)); 4126 spin_unlock(&ifp->lock); 4127 write_unlock_bh(&idev->lock); 4128 4129 /* send a neighbour solicitation for our addr */ 4130 addrconf_addr_solict_mult(&ifp->addr, &mcaddr); 4131 ndisc_send_ns(ifp->idev->dev, &ifp->addr, &mcaddr, &in6addr_any, 4132 ifp->dad_nonce); 4133 out: 4134 in6_ifa_put(ifp); 4135 rtnl_unlock(); 4136 } 4137 4138 /* ifp->idev must be at least read locked */ 4139 static bool ipv6_lonely_lladdr(struct inet6_ifaddr *ifp) 4140 { 4141 struct inet6_ifaddr *ifpiter; 4142 struct inet6_dev *idev = ifp->idev; 4143 4144 list_for_each_entry_reverse(ifpiter, &idev->addr_list, if_list) { 4145 if (ifpiter->scope > IFA_LINK) 4146 break; 4147 if (ifp != ifpiter && ifpiter->scope == IFA_LINK && 4148 (ifpiter->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE| 4149 IFA_F_OPTIMISTIC|IFA_F_DADFAILED)) == 4150 IFA_F_PERMANENT) 4151 return false; 4152 } 4153 return true; 4154 } 4155 4156 static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id, 4157 bool send_na) 4158 { 4159 struct net_device *dev = ifp->idev->dev; 4160 struct in6_addr lladdr; 4161 bool send_rs, send_mld; 4162 4163 addrconf_del_dad_work(ifp); 4164 4165 /* 4166 * Configure the address for reception. Now it is valid. 4167 */ 4168 4169 ipv6_ifa_notify(RTM_NEWADDR, ifp); 4170 4171 /* If added prefix is link local and we are prepared to process 4172 router advertisements, start sending router solicitations. 4173 */ 4174 4175 read_lock_bh(&ifp->idev->lock); 4176 send_mld = ifp->scope == IFA_LINK && ipv6_lonely_lladdr(ifp); 4177 send_rs = send_mld && 4178 ipv6_accept_ra(ifp->idev) && 4179 ifp->idev->cnf.rtr_solicits != 0 && 4180 (dev->flags&IFF_LOOPBACK) == 0; 4181 read_unlock_bh(&ifp->idev->lock); 4182 4183 /* While dad is in progress mld report's source address is in6_addrany. 4184 * Resend with proper ll now. 4185 */ 4186 if (send_mld) 4187 ipv6_mc_dad_complete(ifp->idev); 4188 4189 /* send unsolicited NA if enabled */ 4190 if (send_na && 4191 (ifp->idev->cnf.ndisc_notify || 4192 dev_net(dev)->ipv6.devconf_all->ndisc_notify)) { 4193 ndisc_send_na(dev, &in6addr_linklocal_allnodes, &ifp->addr, 4194 /*router=*/ !!ifp->idev->cnf.forwarding, 4195 /*solicited=*/ false, /*override=*/ true, 4196 /*inc_opt=*/ true); 4197 } 4198 4199 if (send_rs) { 4200 /* 4201 * If a host as already performed a random delay 4202 * [...] as part of DAD [...] there is no need 4203 * to delay again before sending the first RS 4204 */ 4205 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE)) 4206 return; 4207 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters); 4208 4209 write_lock_bh(&ifp->idev->lock); 4210 spin_lock(&ifp->lock); 4211 ifp->idev->rs_interval = rfc3315_s14_backoff_init( 4212 ifp->idev->cnf.rtr_solicit_interval); 4213 ifp->idev->rs_probes = 1; 4214 ifp->idev->if_flags |= IF_RS_SENT; 4215 addrconf_mod_rs_timer(ifp->idev, ifp->idev->rs_interval); 4216 spin_unlock(&ifp->lock); 4217 write_unlock_bh(&ifp->idev->lock); 4218 } 4219 4220 if (bump_id) 4221 rt_genid_bump_ipv6(dev_net(dev)); 4222 4223 /* Make sure that a new temporary address will be created 4224 * before this temporary address becomes deprecated. 4225 */ 4226 if (ifp->flags & IFA_F_TEMPORARY) 4227 addrconf_verify_rtnl(); 4228 } 4229 4230 static void addrconf_dad_run(struct inet6_dev *idev, bool restart) 4231 { 4232 struct inet6_ifaddr *ifp; 4233 4234 read_lock_bh(&idev->lock); 4235 list_for_each_entry(ifp, &idev->addr_list, if_list) { 4236 spin_lock(&ifp->lock); 4237 if ((ifp->flags & IFA_F_TENTATIVE && 4238 ifp->state == INET6_IFADDR_STATE_DAD) || restart) { 4239 if (restart) 4240 ifp->state = INET6_IFADDR_STATE_PREDAD; 4241 addrconf_dad_kick(ifp); 4242 } 4243 spin_unlock(&ifp->lock); 4244 } 4245 read_unlock_bh(&idev->lock); 4246 } 4247 4248 #ifdef CONFIG_PROC_FS 4249 struct if6_iter_state { 4250 struct seq_net_private p; 4251 int bucket; 4252 int offset; 4253 }; 4254 4255 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos) 4256 { 4257 struct if6_iter_state *state = seq->private; 4258 struct net *net = seq_file_net(seq); 4259 struct inet6_ifaddr *ifa = NULL; 4260 int p = 0; 4261 4262 /* initial bucket if pos is 0 */ 4263 if (pos == 0) { 4264 state->bucket = 0; 4265 state->offset = 0; 4266 } 4267 4268 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) { 4269 hlist_for_each_entry_rcu(ifa, &inet6_addr_lst[state->bucket], 4270 addr_lst) { 4271 if (!net_eq(dev_net(ifa->idev->dev), net)) 4272 continue; 4273 /* sync with offset */ 4274 if (p < state->offset) { 4275 p++; 4276 continue; 4277 } 4278 return ifa; 4279 } 4280 4281 /* prepare for next bucket */ 4282 state->offset = 0; 4283 p = 0; 4284 } 4285 return NULL; 4286 } 4287 4288 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, 4289 struct inet6_ifaddr *ifa) 4290 { 4291 struct if6_iter_state *state = seq->private; 4292 struct net *net = seq_file_net(seq); 4293 4294 hlist_for_each_entry_continue_rcu(ifa, addr_lst) { 4295 if (!net_eq(dev_net(ifa->idev->dev), net)) 4296 continue; 4297 state->offset++; 4298 return ifa; 4299 } 4300 4301 state->offset = 0; 4302 while (++state->bucket < IN6_ADDR_HSIZE) { 4303 hlist_for_each_entry_rcu(ifa, 4304 &inet6_addr_lst[state->bucket], addr_lst) { 4305 if (!net_eq(dev_net(ifa->idev->dev), net)) 4306 continue; 4307 return ifa; 4308 } 4309 } 4310 4311 return NULL; 4312 } 4313 4314 static void *if6_seq_start(struct seq_file *seq, loff_t *pos) 4315 __acquires(rcu) 4316 { 4317 rcu_read_lock(); 4318 return if6_get_first(seq, *pos); 4319 } 4320 4321 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos) 4322 { 4323 struct inet6_ifaddr *ifa; 4324 4325 ifa = if6_get_next(seq, v); 4326 ++*pos; 4327 return ifa; 4328 } 4329 4330 static void if6_seq_stop(struct seq_file *seq, void *v) 4331 __releases(rcu) 4332 { 4333 rcu_read_unlock(); 4334 } 4335 4336 static int if6_seq_show(struct seq_file *seq, void *v) 4337 { 4338 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v; 4339 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n", 4340 &ifp->addr, 4341 ifp->idev->dev->ifindex, 4342 ifp->prefix_len, 4343 ifp->scope, 4344 (u8) ifp->flags, 4345 ifp->idev->dev->name); 4346 return 0; 4347 } 4348 4349 static const struct seq_operations if6_seq_ops = { 4350 .start = if6_seq_start, 4351 .next = if6_seq_next, 4352 .show = if6_seq_show, 4353 .stop = if6_seq_stop, 4354 }; 4355 4356 static int __net_init if6_proc_net_init(struct net *net) 4357 { 4358 if (!proc_create_net("if_inet6", 0444, net->proc_net, &if6_seq_ops, 4359 sizeof(struct if6_iter_state))) 4360 return -ENOMEM; 4361 return 0; 4362 } 4363 4364 static void __net_exit if6_proc_net_exit(struct net *net) 4365 { 4366 remove_proc_entry("if_inet6", net->proc_net); 4367 } 4368 4369 static struct pernet_operations if6_proc_net_ops = { 4370 .init = if6_proc_net_init, 4371 .exit = if6_proc_net_exit, 4372 }; 4373 4374 int __init if6_proc_init(void) 4375 { 4376 return register_pernet_subsys(&if6_proc_net_ops); 4377 } 4378 4379 void if6_proc_exit(void) 4380 { 4381 unregister_pernet_subsys(&if6_proc_net_ops); 4382 } 4383 #endif /* CONFIG_PROC_FS */ 4384 4385 #if IS_ENABLED(CONFIG_IPV6_MIP6) 4386 /* Check if address is a home address configured on any interface. */ 4387 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr) 4388 { 4389 unsigned int hash = inet6_addr_hash(net, addr); 4390 struct inet6_ifaddr *ifp = NULL; 4391 int ret = 0; 4392 4393 rcu_read_lock(); 4394 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) { 4395 if (!net_eq(dev_net(ifp->idev->dev), net)) 4396 continue; 4397 if (ipv6_addr_equal(&ifp->addr, addr) && 4398 (ifp->flags & IFA_F_HOMEADDRESS)) { 4399 ret = 1; 4400 break; 4401 } 4402 } 4403 rcu_read_unlock(); 4404 return ret; 4405 } 4406 #endif 4407 4408 /* RFC6554 has some algorithm to avoid loops in segment routing by 4409 * checking if the segments contains any of a local interface address. 4410 * 4411 * Quote: 4412 * 4413 * To detect loops in the SRH, a router MUST determine if the SRH 4414 * includes multiple addresses assigned to any interface on that router. 4415 * If such addresses appear more than once and are separated by at least 4416 * one address not assigned to that router. 4417 */ 4418 int ipv6_chk_rpl_srh_loop(struct net *net, const struct in6_addr *segs, 4419 unsigned char nsegs) 4420 { 4421 const struct in6_addr *addr; 4422 int i, ret = 0, found = 0; 4423 struct inet6_ifaddr *ifp; 4424 bool separated = false; 4425 unsigned int hash; 4426 bool hash_found; 4427 4428 rcu_read_lock(); 4429 for (i = 0; i < nsegs; i++) { 4430 addr = &segs[i]; 4431 hash = inet6_addr_hash(net, addr); 4432 4433 hash_found = false; 4434 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) { 4435 if (!net_eq(dev_net(ifp->idev->dev), net)) 4436 continue; 4437 4438 if (ipv6_addr_equal(&ifp->addr, addr)) { 4439 hash_found = true; 4440 break; 4441 } 4442 } 4443 4444 if (hash_found) { 4445 if (found > 1 && separated) { 4446 ret = 1; 4447 break; 4448 } 4449 4450 separated = false; 4451 found++; 4452 } else { 4453 separated = true; 4454 } 4455 } 4456 rcu_read_unlock(); 4457 4458 return ret; 4459 } 4460 4461 /* 4462 * Periodic address status verification 4463 */ 4464 4465 static void addrconf_verify_rtnl(void) 4466 { 4467 unsigned long now, next, next_sec, next_sched; 4468 struct inet6_ifaddr *ifp; 4469 int i; 4470 4471 ASSERT_RTNL(); 4472 4473 rcu_read_lock_bh(); 4474 now = jiffies; 4475 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY); 4476 4477 cancel_delayed_work(&addr_chk_work); 4478 4479 for (i = 0; i < IN6_ADDR_HSIZE; i++) { 4480 restart: 4481 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[i], addr_lst) { 4482 unsigned long age; 4483 4484 /* When setting preferred_lft to a value not zero or 4485 * infinity, while valid_lft is infinity 4486 * IFA_F_PERMANENT has a non-infinity life time. 4487 */ 4488 if ((ifp->flags & IFA_F_PERMANENT) && 4489 (ifp->prefered_lft == INFINITY_LIFE_TIME)) 4490 continue; 4491 4492 spin_lock(&ifp->lock); 4493 /* We try to batch several events at once. */ 4494 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ; 4495 4496 if (ifp->valid_lft != INFINITY_LIFE_TIME && 4497 age >= ifp->valid_lft) { 4498 spin_unlock(&ifp->lock); 4499 in6_ifa_hold(ifp); 4500 ipv6_del_addr(ifp); 4501 goto restart; 4502 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) { 4503 spin_unlock(&ifp->lock); 4504 continue; 4505 } else if (age >= ifp->prefered_lft) { 4506 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */ 4507 int deprecate = 0; 4508 4509 if (!(ifp->flags&IFA_F_DEPRECATED)) { 4510 deprecate = 1; 4511 ifp->flags |= IFA_F_DEPRECATED; 4512 } 4513 4514 if ((ifp->valid_lft != INFINITY_LIFE_TIME) && 4515 (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))) 4516 next = ifp->tstamp + ifp->valid_lft * HZ; 4517 4518 spin_unlock(&ifp->lock); 4519 4520 if (deprecate) { 4521 in6_ifa_hold(ifp); 4522 4523 ipv6_ifa_notify(0, ifp); 4524 in6_ifa_put(ifp); 4525 goto restart; 4526 } 4527 } else if ((ifp->flags&IFA_F_TEMPORARY) && 4528 !(ifp->flags&IFA_F_TENTATIVE)) { 4529 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry * 4530 ifp->idev->cnf.dad_transmits * 4531 max(NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME), HZ/100) / HZ; 4532 4533 if (age >= ifp->prefered_lft - regen_advance) { 4534 struct inet6_ifaddr *ifpub = ifp->ifpub; 4535 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 4536 next = ifp->tstamp + ifp->prefered_lft * HZ; 4537 if (!ifp->regen_count && ifpub) { 4538 ifp->regen_count++; 4539 in6_ifa_hold(ifp); 4540 in6_ifa_hold(ifpub); 4541 spin_unlock(&ifp->lock); 4542 4543 spin_lock(&ifpub->lock); 4544 ifpub->regen_count = 0; 4545 spin_unlock(&ifpub->lock); 4546 rcu_read_unlock_bh(); 4547 ipv6_create_tempaddr(ifpub, ifp, true); 4548 in6_ifa_put(ifpub); 4549 in6_ifa_put(ifp); 4550 rcu_read_lock_bh(); 4551 goto restart; 4552 } 4553 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next)) 4554 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ; 4555 spin_unlock(&ifp->lock); 4556 } else { 4557 /* ifp->prefered_lft <= ifp->valid_lft */ 4558 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 4559 next = ifp->tstamp + ifp->prefered_lft * HZ; 4560 spin_unlock(&ifp->lock); 4561 } 4562 } 4563 } 4564 4565 next_sec = round_jiffies_up(next); 4566 next_sched = next; 4567 4568 /* If rounded timeout is accurate enough, accept it. */ 4569 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ)) 4570 next_sched = next_sec; 4571 4572 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */ 4573 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX)) 4574 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX; 4575 4576 pr_debug("now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n", 4577 now, next, next_sec, next_sched); 4578 mod_delayed_work(addrconf_wq, &addr_chk_work, next_sched - now); 4579 rcu_read_unlock_bh(); 4580 } 4581 4582 static void addrconf_verify_work(struct work_struct *w) 4583 { 4584 rtnl_lock(); 4585 addrconf_verify_rtnl(); 4586 rtnl_unlock(); 4587 } 4588 4589 static void addrconf_verify(void) 4590 { 4591 mod_delayed_work(addrconf_wq, &addr_chk_work, 0); 4592 } 4593 4594 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local, 4595 struct in6_addr **peer_pfx) 4596 { 4597 struct in6_addr *pfx = NULL; 4598 4599 *peer_pfx = NULL; 4600 4601 if (addr) 4602 pfx = nla_data(addr); 4603 4604 if (local) { 4605 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx))) 4606 *peer_pfx = pfx; 4607 pfx = nla_data(local); 4608 } 4609 4610 return pfx; 4611 } 4612 4613 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = { 4614 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) }, 4615 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) }, 4616 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) }, 4617 [IFA_FLAGS] = { .len = sizeof(u32) }, 4618 [IFA_RT_PRIORITY] = { .len = sizeof(u32) }, 4619 [IFA_TARGET_NETNSID] = { .type = NLA_S32 }, 4620 }; 4621 4622 static int 4623 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, 4624 struct netlink_ext_ack *extack) 4625 { 4626 struct net *net = sock_net(skb->sk); 4627 struct ifaddrmsg *ifm; 4628 struct nlattr *tb[IFA_MAX+1]; 4629 struct in6_addr *pfx, *peer_pfx; 4630 u32 ifa_flags; 4631 int err; 4632 4633 err = nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX, 4634 ifa_ipv6_policy, extack); 4635 if (err < 0) 4636 return err; 4637 4638 ifm = nlmsg_data(nlh); 4639 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx); 4640 if (!pfx) 4641 return -EINVAL; 4642 4643 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags; 4644 4645 /* We ignore other flags so far. */ 4646 ifa_flags &= IFA_F_MANAGETEMPADDR; 4647 4648 return inet6_addr_del(net, ifm->ifa_index, ifa_flags, pfx, 4649 ifm->ifa_prefixlen); 4650 } 4651 4652 static int modify_prefix_route(struct inet6_ifaddr *ifp, 4653 unsigned long expires, u32 flags, 4654 bool modify_peer) 4655 { 4656 struct fib6_info *f6i; 4657 u32 prio; 4658 4659 f6i = addrconf_get_prefix_route(modify_peer ? &ifp->peer_addr : &ifp->addr, 4660 ifp->prefix_len, 4661 ifp->idev->dev, 0, RTF_DEFAULT, true); 4662 if (!f6i) 4663 return -ENOENT; 4664 4665 prio = ifp->rt_priority ? : IP6_RT_PRIO_ADDRCONF; 4666 if (f6i->fib6_metric != prio) { 4667 /* delete old one */ 4668 ip6_del_rt(dev_net(ifp->idev->dev), f6i); 4669 4670 /* add new one */ 4671 addrconf_prefix_route(modify_peer ? &ifp->peer_addr : &ifp->addr, 4672 ifp->prefix_len, 4673 ifp->rt_priority, ifp->idev->dev, 4674 expires, flags, GFP_KERNEL); 4675 } else { 4676 if (!expires) 4677 fib6_clean_expires(f6i); 4678 else 4679 fib6_set_expires(f6i, expires); 4680 4681 fib6_info_release(f6i); 4682 } 4683 4684 return 0; 4685 } 4686 4687 static int inet6_addr_modify(struct inet6_ifaddr *ifp, struct ifa6_config *cfg) 4688 { 4689 u32 flags; 4690 clock_t expires; 4691 unsigned long timeout; 4692 bool was_managetempaddr; 4693 bool had_prefixroute; 4694 bool new_peer = false; 4695 4696 ASSERT_RTNL(); 4697 4698 if (!cfg->valid_lft || cfg->preferred_lft > cfg->valid_lft) 4699 return -EINVAL; 4700 4701 if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR && 4702 (ifp->flags & IFA_F_TEMPORARY || ifp->prefix_len != 64)) 4703 return -EINVAL; 4704 4705 if (!(ifp->flags & IFA_F_TENTATIVE) || ifp->flags & IFA_F_DADFAILED) 4706 cfg->ifa_flags &= ~IFA_F_OPTIMISTIC; 4707 4708 timeout = addrconf_timeout_fixup(cfg->valid_lft, HZ); 4709 if (addrconf_finite_timeout(timeout)) { 4710 expires = jiffies_to_clock_t(timeout * HZ); 4711 cfg->valid_lft = timeout; 4712 flags = RTF_EXPIRES; 4713 } else { 4714 expires = 0; 4715 flags = 0; 4716 cfg->ifa_flags |= IFA_F_PERMANENT; 4717 } 4718 4719 timeout = addrconf_timeout_fixup(cfg->preferred_lft, HZ); 4720 if (addrconf_finite_timeout(timeout)) { 4721 if (timeout == 0) 4722 cfg->ifa_flags |= IFA_F_DEPRECATED; 4723 cfg->preferred_lft = timeout; 4724 } 4725 4726 if (cfg->peer_pfx && 4727 memcmp(&ifp->peer_addr, cfg->peer_pfx, sizeof(struct in6_addr))) { 4728 if (!ipv6_addr_any(&ifp->peer_addr)) 4729 cleanup_prefix_route(ifp, expires, true, true); 4730 new_peer = true; 4731 } 4732 4733 spin_lock_bh(&ifp->lock); 4734 was_managetempaddr = ifp->flags & IFA_F_MANAGETEMPADDR; 4735 had_prefixroute = ifp->flags & IFA_F_PERMANENT && 4736 !(ifp->flags & IFA_F_NOPREFIXROUTE); 4737 ifp->flags &= ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | 4738 IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR | 4739 IFA_F_NOPREFIXROUTE); 4740 ifp->flags |= cfg->ifa_flags; 4741 ifp->tstamp = jiffies; 4742 ifp->valid_lft = cfg->valid_lft; 4743 ifp->prefered_lft = cfg->preferred_lft; 4744 4745 if (cfg->rt_priority && cfg->rt_priority != ifp->rt_priority) 4746 ifp->rt_priority = cfg->rt_priority; 4747 4748 if (new_peer) 4749 ifp->peer_addr = *cfg->peer_pfx; 4750 4751 spin_unlock_bh(&ifp->lock); 4752 if (!(ifp->flags&IFA_F_TENTATIVE)) 4753 ipv6_ifa_notify(0, ifp); 4754 4755 if (!(cfg->ifa_flags & IFA_F_NOPREFIXROUTE)) { 4756 int rc = -ENOENT; 4757 4758 if (had_prefixroute) 4759 rc = modify_prefix_route(ifp, expires, flags, false); 4760 4761 /* prefix route could have been deleted; if so restore it */ 4762 if (rc == -ENOENT) { 4763 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, 4764 ifp->rt_priority, ifp->idev->dev, 4765 expires, flags, GFP_KERNEL); 4766 } 4767 4768 if (had_prefixroute && !ipv6_addr_any(&ifp->peer_addr)) 4769 rc = modify_prefix_route(ifp, expires, flags, true); 4770 4771 if (rc == -ENOENT && !ipv6_addr_any(&ifp->peer_addr)) { 4772 addrconf_prefix_route(&ifp->peer_addr, ifp->prefix_len, 4773 ifp->rt_priority, ifp->idev->dev, 4774 expires, flags, GFP_KERNEL); 4775 } 4776 } else if (had_prefixroute) { 4777 enum cleanup_prefix_rt_t action; 4778 unsigned long rt_expires; 4779 4780 write_lock_bh(&ifp->idev->lock); 4781 action = check_cleanup_prefix_route(ifp, &rt_expires); 4782 write_unlock_bh(&ifp->idev->lock); 4783 4784 if (action != CLEANUP_PREFIX_RT_NOP) { 4785 cleanup_prefix_route(ifp, rt_expires, 4786 action == CLEANUP_PREFIX_RT_DEL, false); 4787 } 4788 } 4789 4790 if (was_managetempaddr || ifp->flags & IFA_F_MANAGETEMPADDR) { 4791 if (was_managetempaddr && 4792 !(ifp->flags & IFA_F_MANAGETEMPADDR)) { 4793 cfg->valid_lft = 0; 4794 cfg->preferred_lft = 0; 4795 } 4796 manage_tempaddrs(ifp->idev, ifp, cfg->valid_lft, 4797 cfg->preferred_lft, !was_managetempaddr, 4798 jiffies); 4799 } 4800 4801 addrconf_verify_rtnl(); 4802 4803 return 0; 4804 } 4805 4806 static int 4807 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, 4808 struct netlink_ext_ack *extack) 4809 { 4810 struct net *net = sock_net(skb->sk); 4811 struct ifaddrmsg *ifm; 4812 struct nlattr *tb[IFA_MAX+1]; 4813 struct in6_addr *peer_pfx; 4814 struct inet6_ifaddr *ifa; 4815 struct net_device *dev; 4816 struct inet6_dev *idev; 4817 struct ifa6_config cfg; 4818 int err; 4819 4820 err = nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX, 4821 ifa_ipv6_policy, extack); 4822 if (err < 0) 4823 return err; 4824 4825 memset(&cfg, 0, sizeof(cfg)); 4826 4827 ifm = nlmsg_data(nlh); 4828 cfg.pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx); 4829 if (!cfg.pfx) 4830 return -EINVAL; 4831 4832 cfg.peer_pfx = peer_pfx; 4833 cfg.plen = ifm->ifa_prefixlen; 4834 if (tb[IFA_RT_PRIORITY]) 4835 cfg.rt_priority = nla_get_u32(tb[IFA_RT_PRIORITY]); 4836 4837 cfg.valid_lft = INFINITY_LIFE_TIME; 4838 cfg.preferred_lft = INFINITY_LIFE_TIME; 4839 4840 if (tb[IFA_CACHEINFO]) { 4841 struct ifa_cacheinfo *ci; 4842 4843 ci = nla_data(tb[IFA_CACHEINFO]); 4844 cfg.valid_lft = ci->ifa_valid; 4845 cfg.preferred_lft = ci->ifa_prefered; 4846 } 4847 4848 dev = __dev_get_by_index(net, ifm->ifa_index); 4849 if (!dev) 4850 return -ENODEV; 4851 4852 if (tb[IFA_FLAGS]) 4853 cfg.ifa_flags = nla_get_u32(tb[IFA_FLAGS]); 4854 else 4855 cfg.ifa_flags = ifm->ifa_flags; 4856 4857 /* We ignore other flags so far. */ 4858 cfg.ifa_flags &= IFA_F_NODAD | IFA_F_HOMEADDRESS | 4859 IFA_F_MANAGETEMPADDR | IFA_F_NOPREFIXROUTE | 4860 IFA_F_MCAUTOJOIN | IFA_F_OPTIMISTIC; 4861 4862 idev = ipv6_find_idev(dev); 4863 if (IS_ERR(idev)) 4864 return PTR_ERR(idev); 4865 4866 if (!ipv6_allow_optimistic_dad(net, idev)) 4867 cfg.ifa_flags &= ~IFA_F_OPTIMISTIC; 4868 4869 if (cfg.ifa_flags & IFA_F_NODAD && 4870 cfg.ifa_flags & IFA_F_OPTIMISTIC) { 4871 NL_SET_ERR_MSG(extack, "IFA_F_NODAD and IFA_F_OPTIMISTIC are mutually exclusive"); 4872 return -EINVAL; 4873 } 4874 4875 ifa = ipv6_get_ifaddr(net, cfg.pfx, dev, 1); 4876 if (!ifa) { 4877 /* 4878 * It would be best to check for !NLM_F_CREATE here but 4879 * userspace already relies on not having to provide this. 4880 */ 4881 return inet6_addr_add(net, ifm->ifa_index, &cfg, extack); 4882 } 4883 4884 if (nlh->nlmsg_flags & NLM_F_EXCL || 4885 !(nlh->nlmsg_flags & NLM_F_REPLACE)) 4886 err = -EEXIST; 4887 else 4888 err = inet6_addr_modify(ifa, &cfg); 4889 4890 in6_ifa_put(ifa); 4891 4892 return err; 4893 } 4894 4895 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u32 flags, 4896 u8 scope, int ifindex) 4897 { 4898 struct ifaddrmsg *ifm; 4899 4900 ifm = nlmsg_data(nlh); 4901 ifm->ifa_family = AF_INET6; 4902 ifm->ifa_prefixlen = prefixlen; 4903 ifm->ifa_flags = flags; 4904 ifm->ifa_scope = scope; 4905 ifm->ifa_index = ifindex; 4906 } 4907 4908 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp, 4909 unsigned long tstamp, u32 preferred, u32 valid) 4910 { 4911 struct ifa_cacheinfo ci; 4912 4913 ci.cstamp = cstamp_delta(cstamp); 4914 ci.tstamp = cstamp_delta(tstamp); 4915 ci.ifa_prefered = preferred; 4916 ci.ifa_valid = valid; 4917 4918 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci); 4919 } 4920 4921 static inline int rt_scope(int ifa_scope) 4922 { 4923 if (ifa_scope & IFA_HOST) 4924 return RT_SCOPE_HOST; 4925 else if (ifa_scope & IFA_LINK) 4926 return RT_SCOPE_LINK; 4927 else if (ifa_scope & IFA_SITE) 4928 return RT_SCOPE_SITE; 4929 else 4930 return RT_SCOPE_UNIVERSE; 4931 } 4932 4933 static inline int inet6_ifaddr_msgsize(void) 4934 { 4935 return NLMSG_ALIGN(sizeof(struct ifaddrmsg)) 4936 + nla_total_size(16) /* IFA_LOCAL */ 4937 + nla_total_size(16) /* IFA_ADDRESS */ 4938 + nla_total_size(sizeof(struct ifa_cacheinfo)) 4939 + nla_total_size(4) /* IFA_FLAGS */ 4940 + nla_total_size(4) /* IFA_RT_PRIORITY */; 4941 } 4942 4943 enum addr_type_t { 4944 UNICAST_ADDR, 4945 MULTICAST_ADDR, 4946 ANYCAST_ADDR, 4947 }; 4948 4949 struct inet6_fill_args { 4950 u32 portid; 4951 u32 seq; 4952 int event; 4953 unsigned int flags; 4954 int netnsid; 4955 int ifindex; 4956 enum addr_type_t type; 4957 }; 4958 4959 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa, 4960 struct inet6_fill_args *args) 4961 { 4962 struct nlmsghdr *nlh; 4963 u32 preferred, valid; 4964 4965 nlh = nlmsg_put(skb, args->portid, args->seq, args->event, 4966 sizeof(struct ifaddrmsg), args->flags); 4967 if (!nlh) 4968 return -EMSGSIZE; 4969 4970 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope), 4971 ifa->idev->dev->ifindex); 4972 4973 if (args->netnsid >= 0 && 4974 nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid)) 4975 goto error; 4976 4977 if (!((ifa->flags&IFA_F_PERMANENT) && 4978 (ifa->prefered_lft == INFINITY_LIFE_TIME))) { 4979 preferred = ifa->prefered_lft; 4980 valid = ifa->valid_lft; 4981 if (preferred != INFINITY_LIFE_TIME) { 4982 long tval = (jiffies - ifa->tstamp)/HZ; 4983 if (preferred > tval) 4984 preferred -= tval; 4985 else 4986 preferred = 0; 4987 if (valid != INFINITY_LIFE_TIME) { 4988 if (valid > tval) 4989 valid -= tval; 4990 else 4991 valid = 0; 4992 } 4993 } 4994 } else { 4995 preferred = INFINITY_LIFE_TIME; 4996 valid = INFINITY_LIFE_TIME; 4997 } 4998 4999 if (!ipv6_addr_any(&ifa->peer_addr)) { 5000 if (nla_put_in6_addr(skb, IFA_LOCAL, &ifa->addr) < 0 || 5001 nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->peer_addr) < 0) 5002 goto error; 5003 } else 5004 if (nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->addr) < 0) 5005 goto error; 5006 5007 if (ifa->rt_priority && 5008 nla_put_u32(skb, IFA_RT_PRIORITY, ifa->rt_priority)) 5009 goto error; 5010 5011 if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) 5012 goto error; 5013 5014 if (nla_put_u32(skb, IFA_FLAGS, ifa->flags) < 0) 5015 goto error; 5016 5017 nlmsg_end(skb, nlh); 5018 return 0; 5019 5020 error: 5021 nlmsg_cancel(skb, nlh); 5022 return -EMSGSIZE; 5023 } 5024 5025 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca, 5026 struct inet6_fill_args *args) 5027 { 5028 struct nlmsghdr *nlh; 5029 u8 scope = RT_SCOPE_UNIVERSE; 5030 int ifindex = ifmca->idev->dev->ifindex; 5031 5032 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE) 5033 scope = RT_SCOPE_SITE; 5034 5035 nlh = nlmsg_put(skb, args->portid, args->seq, args->event, 5036 sizeof(struct ifaddrmsg), args->flags); 5037 if (!nlh) 5038 return -EMSGSIZE; 5039 5040 if (args->netnsid >= 0 && 5041 nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid)) 5042 return -EMSGSIZE; 5043 5044 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 5045 if (nla_put_in6_addr(skb, IFA_MULTICAST, &ifmca->mca_addr) < 0 || 5046 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp, 5047 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 5048 nlmsg_cancel(skb, nlh); 5049 return -EMSGSIZE; 5050 } 5051 5052 nlmsg_end(skb, nlh); 5053 return 0; 5054 } 5055 5056 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca, 5057 struct inet6_fill_args *args) 5058 { 5059 struct net_device *dev = fib6_info_nh_dev(ifaca->aca_rt); 5060 int ifindex = dev ? dev->ifindex : 1; 5061 struct nlmsghdr *nlh; 5062 u8 scope = RT_SCOPE_UNIVERSE; 5063 5064 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE) 5065 scope = RT_SCOPE_SITE; 5066 5067 nlh = nlmsg_put(skb, args->portid, args->seq, args->event, 5068 sizeof(struct ifaddrmsg), args->flags); 5069 if (!nlh) 5070 return -EMSGSIZE; 5071 5072 if (args->netnsid >= 0 && 5073 nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid)) 5074 return -EMSGSIZE; 5075 5076 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 5077 if (nla_put_in6_addr(skb, IFA_ANYCAST, &ifaca->aca_addr) < 0 || 5078 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp, 5079 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 5080 nlmsg_cancel(skb, nlh); 5081 return -EMSGSIZE; 5082 } 5083 5084 nlmsg_end(skb, nlh); 5085 return 0; 5086 } 5087 5088 /* called with rcu_read_lock() */ 5089 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb, 5090 struct netlink_callback *cb, int s_ip_idx, 5091 struct inet6_fill_args *fillargs) 5092 { 5093 struct ifmcaddr6 *ifmca; 5094 struct ifacaddr6 *ifaca; 5095 int ip_idx = 0; 5096 int err = 1; 5097 5098 read_lock_bh(&idev->lock); 5099 switch (fillargs->type) { 5100 case UNICAST_ADDR: { 5101 struct inet6_ifaddr *ifa; 5102 fillargs->event = RTM_NEWADDR; 5103 5104 /* unicast address incl. temp addr */ 5105 list_for_each_entry(ifa, &idev->addr_list, if_list) { 5106 if (ip_idx < s_ip_idx) 5107 goto next; 5108 err = inet6_fill_ifaddr(skb, ifa, fillargs); 5109 if (err < 0) 5110 break; 5111 nl_dump_check_consistent(cb, nlmsg_hdr(skb)); 5112 next: 5113 ip_idx++; 5114 } 5115 break; 5116 } 5117 case MULTICAST_ADDR: 5118 fillargs->event = RTM_GETMULTICAST; 5119 5120 /* multicast address */ 5121 for (ifmca = idev->mc_list; ifmca; 5122 ifmca = ifmca->next, ip_idx++) { 5123 if (ip_idx < s_ip_idx) 5124 continue; 5125 err = inet6_fill_ifmcaddr(skb, ifmca, fillargs); 5126 if (err < 0) 5127 break; 5128 } 5129 break; 5130 case ANYCAST_ADDR: 5131 fillargs->event = RTM_GETANYCAST; 5132 /* anycast address */ 5133 for (ifaca = idev->ac_list; ifaca; 5134 ifaca = ifaca->aca_next, ip_idx++) { 5135 if (ip_idx < s_ip_idx) 5136 continue; 5137 err = inet6_fill_ifacaddr(skb, ifaca, fillargs); 5138 if (err < 0) 5139 break; 5140 } 5141 break; 5142 default: 5143 break; 5144 } 5145 read_unlock_bh(&idev->lock); 5146 cb->args[2] = ip_idx; 5147 return err; 5148 } 5149 5150 static int inet6_valid_dump_ifaddr_req(const struct nlmsghdr *nlh, 5151 struct inet6_fill_args *fillargs, 5152 struct net **tgt_net, struct sock *sk, 5153 struct netlink_callback *cb) 5154 { 5155 struct netlink_ext_ack *extack = cb->extack; 5156 struct nlattr *tb[IFA_MAX+1]; 5157 struct ifaddrmsg *ifm; 5158 int err, i; 5159 5160 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) { 5161 NL_SET_ERR_MSG_MOD(extack, "Invalid header for address dump request"); 5162 return -EINVAL; 5163 } 5164 5165 ifm = nlmsg_data(nlh); 5166 if (ifm->ifa_prefixlen || ifm->ifa_flags || ifm->ifa_scope) { 5167 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for address dump request"); 5168 return -EINVAL; 5169 } 5170 5171 fillargs->ifindex = ifm->ifa_index; 5172 if (fillargs->ifindex) { 5173 cb->answer_flags |= NLM_F_DUMP_FILTERED; 5174 fillargs->flags |= NLM_F_DUMP_FILTERED; 5175 } 5176 5177 err = nlmsg_parse_deprecated_strict(nlh, sizeof(*ifm), tb, IFA_MAX, 5178 ifa_ipv6_policy, extack); 5179 if (err < 0) 5180 return err; 5181 5182 for (i = 0; i <= IFA_MAX; ++i) { 5183 if (!tb[i]) 5184 continue; 5185 5186 if (i == IFA_TARGET_NETNSID) { 5187 struct net *net; 5188 5189 fillargs->netnsid = nla_get_s32(tb[i]); 5190 net = rtnl_get_net_ns_capable(sk, fillargs->netnsid); 5191 if (IS_ERR(net)) { 5192 fillargs->netnsid = -1; 5193 NL_SET_ERR_MSG_MOD(extack, "Invalid target network namespace id"); 5194 return PTR_ERR(net); 5195 } 5196 *tgt_net = net; 5197 } else { 5198 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in dump request"); 5199 return -EINVAL; 5200 } 5201 } 5202 5203 return 0; 5204 } 5205 5206 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb, 5207 enum addr_type_t type) 5208 { 5209 const struct nlmsghdr *nlh = cb->nlh; 5210 struct inet6_fill_args fillargs = { 5211 .portid = NETLINK_CB(cb->skb).portid, 5212 .seq = cb->nlh->nlmsg_seq, 5213 .flags = NLM_F_MULTI, 5214 .netnsid = -1, 5215 .type = type, 5216 }; 5217 struct net *net = sock_net(skb->sk); 5218 struct net *tgt_net = net; 5219 int idx, s_idx, s_ip_idx; 5220 int h, s_h; 5221 struct net_device *dev; 5222 struct inet6_dev *idev; 5223 struct hlist_head *head; 5224 int err = 0; 5225 5226 s_h = cb->args[0]; 5227 s_idx = idx = cb->args[1]; 5228 s_ip_idx = cb->args[2]; 5229 5230 if (cb->strict_check) { 5231 err = inet6_valid_dump_ifaddr_req(nlh, &fillargs, &tgt_net, 5232 skb->sk, cb); 5233 if (err < 0) 5234 goto put_tgt_net; 5235 5236 err = 0; 5237 if (fillargs.ifindex) { 5238 dev = __dev_get_by_index(tgt_net, fillargs.ifindex); 5239 if (!dev) { 5240 err = -ENODEV; 5241 goto put_tgt_net; 5242 } 5243 idev = __in6_dev_get(dev); 5244 if (idev) { 5245 err = in6_dump_addrs(idev, skb, cb, s_ip_idx, 5246 &fillargs); 5247 if (err > 0) 5248 err = 0; 5249 } 5250 goto put_tgt_net; 5251 } 5252 } 5253 5254 rcu_read_lock(); 5255 cb->seq = atomic_read(&tgt_net->ipv6.dev_addr_genid) ^ tgt_net->dev_base_seq; 5256 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 5257 idx = 0; 5258 head = &tgt_net->dev_index_head[h]; 5259 hlist_for_each_entry_rcu(dev, head, index_hlist) { 5260 if (idx < s_idx) 5261 goto cont; 5262 if (h > s_h || idx > s_idx) 5263 s_ip_idx = 0; 5264 idev = __in6_dev_get(dev); 5265 if (!idev) 5266 goto cont; 5267 5268 if (in6_dump_addrs(idev, skb, cb, s_ip_idx, 5269 &fillargs) < 0) 5270 goto done; 5271 cont: 5272 idx++; 5273 } 5274 } 5275 done: 5276 rcu_read_unlock(); 5277 cb->args[0] = h; 5278 cb->args[1] = idx; 5279 put_tgt_net: 5280 if (fillargs.netnsid >= 0) 5281 put_net(tgt_net); 5282 5283 return skb->len ? : err; 5284 } 5285 5286 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb) 5287 { 5288 enum addr_type_t type = UNICAST_ADDR; 5289 5290 return inet6_dump_addr(skb, cb, type); 5291 } 5292 5293 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb) 5294 { 5295 enum addr_type_t type = MULTICAST_ADDR; 5296 5297 return inet6_dump_addr(skb, cb, type); 5298 } 5299 5300 5301 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb) 5302 { 5303 enum addr_type_t type = ANYCAST_ADDR; 5304 5305 return inet6_dump_addr(skb, cb, type); 5306 } 5307 5308 static int inet6_rtm_valid_getaddr_req(struct sk_buff *skb, 5309 const struct nlmsghdr *nlh, 5310 struct nlattr **tb, 5311 struct netlink_ext_ack *extack) 5312 { 5313 struct ifaddrmsg *ifm; 5314 int i, err; 5315 5316 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) { 5317 NL_SET_ERR_MSG_MOD(extack, "Invalid header for get address request"); 5318 return -EINVAL; 5319 } 5320 5321 if (!netlink_strict_get_check(skb)) 5322 return nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX, 5323 ifa_ipv6_policy, extack); 5324 5325 ifm = nlmsg_data(nlh); 5326 if (ifm->ifa_prefixlen || ifm->ifa_flags || ifm->ifa_scope) { 5327 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for get address request"); 5328 return -EINVAL; 5329 } 5330 5331 err = nlmsg_parse_deprecated_strict(nlh, sizeof(*ifm), tb, IFA_MAX, 5332 ifa_ipv6_policy, extack); 5333 if (err) 5334 return err; 5335 5336 for (i = 0; i <= IFA_MAX; i++) { 5337 if (!tb[i]) 5338 continue; 5339 5340 switch (i) { 5341 case IFA_TARGET_NETNSID: 5342 case IFA_ADDRESS: 5343 case IFA_LOCAL: 5344 break; 5345 default: 5346 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in get address request"); 5347 return -EINVAL; 5348 } 5349 } 5350 5351 return 0; 5352 } 5353 5354 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh, 5355 struct netlink_ext_ack *extack) 5356 { 5357 struct net *net = sock_net(in_skb->sk); 5358 struct inet6_fill_args fillargs = { 5359 .portid = NETLINK_CB(in_skb).portid, 5360 .seq = nlh->nlmsg_seq, 5361 .event = RTM_NEWADDR, 5362 .flags = 0, 5363 .netnsid = -1, 5364 }; 5365 struct net *tgt_net = net; 5366 struct ifaddrmsg *ifm; 5367 struct nlattr *tb[IFA_MAX+1]; 5368 struct in6_addr *addr = NULL, *peer; 5369 struct net_device *dev = NULL; 5370 struct inet6_ifaddr *ifa; 5371 struct sk_buff *skb; 5372 int err; 5373 5374 err = inet6_rtm_valid_getaddr_req(in_skb, nlh, tb, extack); 5375 if (err < 0) 5376 return err; 5377 5378 if (tb[IFA_TARGET_NETNSID]) { 5379 fillargs.netnsid = nla_get_s32(tb[IFA_TARGET_NETNSID]); 5380 5381 tgt_net = rtnl_get_net_ns_capable(NETLINK_CB(in_skb).sk, 5382 fillargs.netnsid); 5383 if (IS_ERR(tgt_net)) 5384 return PTR_ERR(tgt_net); 5385 } 5386 5387 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer); 5388 if (!addr) 5389 return -EINVAL; 5390 5391 ifm = nlmsg_data(nlh); 5392 if (ifm->ifa_index) 5393 dev = dev_get_by_index(tgt_net, ifm->ifa_index); 5394 5395 ifa = ipv6_get_ifaddr(tgt_net, addr, dev, 1); 5396 if (!ifa) { 5397 err = -EADDRNOTAVAIL; 5398 goto errout; 5399 } 5400 5401 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL); 5402 if (!skb) { 5403 err = -ENOBUFS; 5404 goto errout_ifa; 5405 } 5406 5407 err = inet6_fill_ifaddr(skb, ifa, &fillargs); 5408 if (err < 0) { 5409 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 5410 WARN_ON(err == -EMSGSIZE); 5411 kfree_skb(skb); 5412 goto errout_ifa; 5413 } 5414 err = rtnl_unicast(skb, tgt_net, NETLINK_CB(in_skb).portid); 5415 errout_ifa: 5416 in6_ifa_put(ifa); 5417 errout: 5418 if (dev) 5419 dev_put(dev); 5420 if (fillargs.netnsid >= 0) 5421 put_net(tgt_net); 5422 5423 return err; 5424 } 5425 5426 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa) 5427 { 5428 struct sk_buff *skb; 5429 struct net *net = dev_net(ifa->idev->dev); 5430 struct inet6_fill_args fillargs = { 5431 .portid = 0, 5432 .seq = 0, 5433 .event = event, 5434 .flags = 0, 5435 .netnsid = -1, 5436 }; 5437 int err = -ENOBUFS; 5438 5439 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC); 5440 if (!skb) 5441 goto errout; 5442 5443 err = inet6_fill_ifaddr(skb, ifa, &fillargs); 5444 if (err < 0) { 5445 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 5446 WARN_ON(err == -EMSGSIZE); 5447 kfree_skb(skb); 5448 goto errout; 5449 } 5450 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC); 5451 return; 5452 errout: 5453 if (err < 0) 5454 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err); 5455 } 5456 5457 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf, 5458 __s32 *array, int bytes) 5459 { 5460 BUG_ON(bytes < (DEVCONF_MAX * 4)); 5461 5462 memset(array, 0, bytes); 5463 array[DEVCONF_FORWARDING] = cnf->forwarding; 5464 array[DEVCONF_HOPLIMIT] = cnf->hop_limit; 5465 array[DEVCONF_MTU6] = cnf->mtu6; 5466 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra; 5467 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects; 5468 array[DEVCONF_AUTOCONF] = cnf->autoconf; 5469 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits; 5470 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits; 5471 array[DEVCONF_RTR_SOLICIT_INTERVAL] = 5472 jiffies_to_msecs(cnf->rtr_solicit_interval); 5473 array[DEVCONF_RTR_SOLICIT_MAX_INTERVAL] = 5474 jiffies_to_msecs(cnf->rtr_solicit_max_interval); 5475 array[DEVCONF_RTR_SOLICIT_DELAY] = 5476 jiffies_to_msecs(cnf->rtr_solicit_delay); 5477 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version; 5478 array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] = 5479 jiffies_to_msecs(cnf->mldv1_unsolicited_report_interval); 5480 array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] = 5481 jiffies_to_msecs(cnf->mldv2_unsolicited_report_interval); 5482 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr; 5483 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft; 5484 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft; 5485 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry; 5486 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor; 5487 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses; 5488 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr; 5489 array[DEVCONF_ACCEPT_RA_MIN_HOP_LIMIT] = cnf->accept_ra_min_hop_limit; 5490 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo; 5491 #ifdef CONFIG_IPV6_ROUTER_PREF 5492 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref; 5493 array[DEVCONF_RTR_PROBE_INTERVAL] = 5494 jiffies_to_msecs(cnf->rtr_probe_interval); 5495 #ifdef CONFIG_IPV6_ROUTE_INFO 5496 array[DEVCONF_ACCEPT_RA_RT_INFO_MIN_PLEN] = cnf->accept_ra_rt_info_min_plen; 5497 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen; 5498 #endif 5499 #endif 5500 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp; 5501 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route; 5502 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 5503 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad; 5504 array[DEVCONF_USE_OPTIMISTIC] = cnf->use_optimistic; 5505 #endif 5506 #ifdef CONFIG_IPV6_MROUTE 5507 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding; 5508 #endif 5509 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6; 5510 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad; 5511 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao; 5512 array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify; 5513 array[DEVCONF_SUPPRESS_FRAG_NDISC] = cnf->suppress_frag_ndisc; 5514 array[DEVCONF_ACCEPT_RA_FROM_LOCAL] = cnf->accept_ra_from_local; 5515 array[DEVCONF_ACCEPT_RA_MTU] = cnf->accept_ra_mtu; 5516 array[DEVCONF_IGNORE_ROUTES_WITH_LINKDOWN] = cnf->ignore_routes_with_linkdown; 5517 /* we omit DEVCONF_STABLE_SECRET for now */ 5518 array[DEVCONF_USE_OIF_ADDRS_ONLY] = cnf->use_oif_addrs_only; 5519 array[DEVCONF_DROP_UNICAST_IN_L2_MULTICAST] = cnf->drop_unicast_in_l2_multicast; 5520 array[DEVCONF_DROP_UNSOLICITED_NA] = cnf->drop_unsolicited_na; 5521 array[DEVCONF_KEEP_ADDR_ON_DOWN] = cnf->keep_addr_on_down; 5522 array[DEVCONF_SEG6_ENABLED] = cnf->seg6_enabled; 5523 #ifdef CONFIG_IPV6_SEG6_HMAC 5524 array[DEVCONF_SEG6_REQUIRE_HMAC] = cnf->seg6_require_hmac; 5525 #endif 5526 array[DEVCONF_ENHANCED_DAD] = cnf->enhanced_dad; 5527 array[DEVCONF_ADDR_GEN_MODE] = cnf->addr_gen_mode; 5528 array[DEVCONF_DISABLE_POLICY] = cnf->disable_policy; 5529 array[DEVCONF_NDISC_TCLASS] = cnf->ndisc_tclass; 5530 array[DEVCONF_RPL_SEG_ENABLED] = cnf->rpl_seg_enabled; 5531 } 5532 5533 static inline size_t inet6_ifla6_size(void) 5534 { 5535 return nla_total_size(4) /* IFLA_INET6_FLAGS */ 5536 + nla_total_size(sizeof(struct ifla_cacheinfo)) 5537 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */ 5538 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */ 5539 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */ 5540 + nla_total_size(sizeof(struct in6_addr)) /* IFLA_INET6_TOKEN */ 5541 + nla_total_size(1) /* IFLA_INET6_ADDR_GEN_MODE */ 5542 + 0; 5543 } 5544 5545 static inline size_t inet6_if_nlmsg_size(void) 5546 { 5547 return NLMSG_ALIGN(sizeof(struct ifinfomsg)) 5548 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */ 5549 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */ 5550 + nla_total_size(4) /* IFLA_MTU */ 5551 + nla_total_size(4) /* IFLA_LINK */ 5552 + nla_total_size(1) /* IFLA_OPERSTATE */ 5553 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */ 5554 } 5555 5556 static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib, 5557 int bytes) 5558 { 5559 int i; 5560 int pad = bytes - sizeof(u64) * ICMP6_MIB_MAX; 5561 BUG_ON(pad < 0); 5562 5563 /* Use put_unaligned() because stats may not be aligned for u64. */ 5564 put_unaligned(ICMP6_MIB_MAX, &stats[0]); 5565 for (i = 1; i < ICMP6_MIB_MAX; i++) 5566 put_unaligned(atomic_long_read(&mib[i]), &stats[i]); 5567 5568 memset(&stats[ICMP6_MIB_MAX], 0, pad); 5569 } 5570 5571 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu *mib, 5572 int bytes, size_t syncpoff) 5573 { 5574 int i, c; 5575 u64 buff[IPSTATS_MIB_MAX]; 5576 int pad = bytes - sizeof(u64) * IPSTATS_MIB_MAX; 5577 5578 BUG_ON(pad < 0); 5579 5580 memset(buff, 0, sizeof(buff)); 5581 buff[0] = IPSTATS_MIB_MAX; 5582 5583 for_each_possible_cpu(c) { 5584 for (i = 1; i < IPSTATS_MIB_MAX; i++) 5585 buff[i] += snmp_get_cpu_field64(mib, c, i, syncpoff); 5586 } 5587 5588 memcpy(stats, buff, IPSTATS_MIB_MAX * sizeof(u64)); 5589 memset(&stats[IPSTATS_MIB_MAX], 0, pad); 5590 } 5591 5592 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype, 5593 int bytes) 5594 { 5595 switch (attrtype) { 5596 case IFLA_INET6_STATS: 5597 __snmp6_fill_stats64(stats, idev->stats.ipv6, bytes, 5598 offsetof(struct ipstats_mib, syncp)); 5599 break; 5600 case IFLA_INET6_ICMP6STATS: 5601 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, bytes); 5602 break; 5603 } 5604 } 5605 5606 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev, 5607 u32 ext_filter_mask) 5608 { 5609 struct nlattr *nla; 5610 struct ifla_cacheinfo ci; 5611 5612 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags)) 5613 goto nla_put_failure; 5614 ci.max_reasm_len = IPV6_MAXPLEN; 5615 ci.tstamp = cstamp_delta(idev->tstamp); 5616 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time); 5617 ci.retrans_time = jiffies_to_msecs(NEIGH_VAR(idev->nd_parms, RETRANS_TIME)); 5618 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci)) 5619 goto nla_put_failure; 5620 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32)); 5621 if (!nla) 5622 goto nla_put_failure; 5623 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla)); 5624 5625 /* XXX - MC not implemented */ 5626 5627 if (ext_filter_mask & RTEXT_FILTER_SKIP_STATS) 5628 return 0; 5629 5630 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64)); 5631 if (!nla) 5632 goto nla_put_failure; 5633 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla)); 5634 5635 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64)); 5636 if (!nla) 5637 goto nla_put_failure; 5638 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla)); 5639 5640 nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr)); 5641 if (!nla) 5642 goto nla_put_failure; 5643 read_lock_bh(&idev->lock); 5644 memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla)); 5645 read_unlock_bh(&idev->lock); 5646 5647 if (nla_put_u8(skb, IFLA_INET6_ADDR_GEN_MODE, idev->cnf.addr_gen_mode)) 5648 goto nla_put_failure; 5649 5650 return 0; 5651 5652 nla_put_failure: 5653 return -EMSGSIZE; 5654 } 5655 5656 static size_t inet6_get_link_af_size(const struct net_device *dev, 5657 u32 ext_filter_mask) 5658 { 5659 if (!__in6_dev_get(dev)) 5660 return 0; 5661 5662 return inet6_ifla6_size(); 5663 } 5664 5665 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev, 5666 u32 ext_filter_mask) 5667 { 5668 struct inet6_dev *idev = __in6_dev_get(dev); 5669 5670 if (!idev) 5671 return -ENODATA; 5672 5673 if (inet6_fill_ifla6_attrs(skb, idev, ext_filter_mask) < 0) 5674 return -EMSGSIZE; 5675 5676 return 0; 5677 } 5678 5679 static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token) 5680 { 5681 struct inet6_ifaddr *ifp; 5682 struct net_device *dev = idev->dev; 5683 bool clear_token, update_rs = false; 5684 struct in6_addr ll_addr; 5685 5686 ASSERT_RTNL(); 5687 5688 if (!token) 5689 return -EINVAL; 5690 if (dev->flags & (IFF_LOOPBACK | IFF_NOARP)) 5691 return -EINVAL; 5692 if (!ipv6_accept_ra(idev)) 5693 return -EINVAL; 5694 if (idev->cnf.rtr_solicits == 0) 5695 return -EINVAL; 5696 5697 write_lock_bh(&idev->lock); 5698 5699 BUILD_BUG_ON(sizeof(token->s6_addr) != 16); 5700 memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8); 5701 5702 write_unlock_bh(&idev->lock); 5703 5704 clear_token = ipv6_addr_any(token); 5705 if (clear_token) 5706 goto update_lft; 5707 5708 if (!idev->dead && (idev->if_flags & IF_READY) && 5709 !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE | 5710 IFA_F_OPTIMISTIC)) { 5711 /* If we're not ready, then normal ifup will take care 5712 * of this. Otherwise, we need to request our rs here. 5713 */ 5714 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters); 5715 update_rs = true; 5716 } 5717 5718 update_lft: 5719 write_lock_bh(&idev->lock); 5720 5721 if (update_rs) { 5722 idev->if_flags |= IF_RS_SENT; 5723 idev->rs_interval = rfc3315_s14_backoff_init( 5724 idev->cnf.rtr_solicit_interval); 5725 idev->rs_probes = 1; 5726 addrconf_mod_rs_timer(idev, idev->rs_interval); 5727 } 5728 5729 /* Well, that's kinda nasty ... */ 5730 list_for_each_entry(ifp, &idev->addr_list, if_list) { 5731 spin_lock(&ifp->lock); 5732 if (ifp->tokenized) { 5733 ifp->valid_lft = 0; 5734 ifp->prefered_lft = 0; 5735 } 5736 spin_unlock(&ifp->lock); 5737 } 5738 5739 write_unlock_bh(&idev->lock); 5740 inet6_ifinfo_notify(RTM_NEWLINK, idev); 5741 addrconf_verify_rtnl(); 5742 return 0; 5743 } 5744 5745 static const struct nla_policy inet6_af_policy[IFLA_INET6_MAX + 1] = { 5746 [IFLA_INET6_ADDR_GEN_MODE] = { .type = NLA_U8 }, 5747 [IFLA_INET6_TOKEN] = { .len = sizeof(struct in6_addr) }, 5748 }; 5749 5750 static int check_addr_gen_mode(int mode) 5751 { 5752 if (mode != IN6_ADDR_GEN_MODE_EUI64 && 5753 mode != IN6_ADDR_GEN_MODE_NONE && 5754 mode != IN6_ADDR_GEN_MODE_STABLE_PRIVACY && 5755 mode != IN6_ADDR_GEN_MODE_RANDOM) 5756 return -EINVAL; 5757 return 1; 5758 } 5759 5760 static int check_stable_privacy(struct inet6_dev *idev, struct net *net, 5761 int mode) 5762 { 5763 if (mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY && 5764 !idev->cnf.stable_secret.initialized && 5765 !net->ipv6.devconf_dflt->stable_secret.initialized) 5766 return -EINVAL; 5767 return 1; 5768 } 5769 5770 static int inet6_validate_link_af(const struct net_device *dev, 5771 const struct nlattr *nla) 5772 { 5773 struct nlattr *tb[IFLA_INET6_MAX + 1]; 5774 struct inet6_dev *idev = NULL; 5775 int err; 5776 5777 if (dev) { 5778 idev = __in6_dev_get(dev); 5779 if (!idev) 5780 return -EAFNOSUPPORT; 5781 } 5782 5783 err = nla_parse_nested_deprecated(tb, IFLA_INET6_MAX, nla, 5784 inet6_af_policy, NULL); 5785 if (err) 5786 return err; 5787 5788 if (!tb[IFLA_INET6_TOKEN] && !tb[IFLA_INET6_ADDR_GEN_MODE]) 5789 return -EINVAL; 5790 5791 if (tb[IFLA_INET6_ADDR_GEN_MODE]) { 5792 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]); 5793 5794 if (check_addr_gen_mode(mode) < 0) 5795 return -EINVAL; 5796 if (dev && check_stable_privacy(idev, dev_net(dev), mode) < 0) 5797 return -EINVAL; 5798 } 5799 5800 return 0; 5801 } 5802 5803 static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla) 5804 { 5805 struct inet6_dev *idev = __in6_dev_get(dev); 5806 struct nlattr *tb[IFLA_INET6_MAX + 1]; 5807 int err; 5808 5809 if (!idev) 5810 return -EAFNOSUPPORT; 5811 5812 if (nla_parse_nested_deprecated(tb, IFLA_INET6_MAX, nla, NULL, NULL) < 0) 5813 BUG(); 5814 5815 if (tb[IFLA_INET6_TOKEN]) { 5816 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN])); 5817 if (err) 5818 return err; 5819 } 5820 5821 if (tb[IFLA_INET6_ADDR_GEN_MODE]) { 5822 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]); 5823 5824 idev->cnf.addr_gen_mode = mode; 5825 } 5826 5827 return 0; 5828 } 5829 5830 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev, 5831 u32 portid, u32 seq, int event, unsigned int flags) 5832 { 5833 struct net_device *dev = idev->dev; 5834 struct ifinfomsg *hdr; 5835 struct nlmsghdr *nlh; 5836 void *protoinfo; 5837 5838 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags); 5839 if (!nlh) 5840 return -EMSGSIZE; 5841 5842 hdr = nlmsg_data(nlh); 5843 hdr->ifi_family = AF_INET6; 5844 hdr->__ifi_pad = 0; 5845 hdr->ifi_type = dev->type; 5846 hdr->ifi_index = dev->ifindex; 5847 hdr->ifi_flags = dev_get_flags(dev); 5848 hdr->ifi_change = 0; 5849 5850 if (nla_put_string(skb, IFLA_IFNAME, dev->name) || 5851 (dev->addr_len && 5852 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) || 5853 nla_put_u32(skb, IFLA_MTU, dev->mtu) || 5854 (dev->ifindex != dev_get_iflink(dev) && 5855 nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))) || 5856 nla_put_u8(skb, IFLA_OPERSTATE, 5857 netif_running(dev) ? dev->operstate : IF_OPER_DOWN)) 5858 goto nla_put_failure; 5859 protoinfo = nla_nest_start_noflag(skb, IFLA_PROTINFO); 5860 if (!protoinfo) 5861 goto nla_put_failure; 5862 5863 if (inet6_fill_ifla6_attrs(skb, idev, 0) < 0) 5864 goto nla_put_failure; 5865 5866 nla_nest_end(skb, protoinfo); 5867 nlmsg_end(skb, nlh); 5868 return 0; 5869 5870 nla_put_failure: 5871 nlmsg_cancel(skb, nlh); 5872 return -EMSGSIZE; 5873 } 5874 5875 static int inet6_valid_dump_ifinfo(const struct nlmsghdr *nlh, 5876 struct netlink_ext_ack *extack) 5877 { 5878 struct ifinfomsg *ifm; 5879 5880 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) { 5881 NL_SET_ERR_MSG_MOD(extack, "Invalid header for link dump request"); 5882 return -EINVAL; 5883 } 5884 5885 if (nlmsg_attrlen(nlh, sizeof(*ifm))) { 5886 NL_SET_ERR_MSG_MOD(extack, "Invalid data after header"); 5887 return -EINVAL; 5888 } 5889 5890 ifm = nlmsg_data(nlh); 5891 if (ifm->__ifi_pad || ifm->ifi_type || ifm->ifi_flags || 5892 ifm->ifi_change || ifm->ifi_index) { 5893 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for dump request"); 5894 return -EINVAL; 5895 } 5896 5897 return 0; 5898 } 5899 5900 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb) 5901 { 5902 struct net *net = sock_net(skb->sk); 5903 int h, s_h; 5904 int idx = 0, s_idx; 5905 struct net_device *dev; 5906 struct inet6_dev *idev; 5907 struct hlist_head *head; 5908 5909 /* only requests using strict checking can pass data to 5910 * influence the dump 5911 */ 5912 if (cb->strict_check) { 5913 int err = inet6_valid_dump_ifinfo(cb->nlh, cb->extack); 5914 5915 if (err < 0) 5916 return err; 5917 } 5918 5919 s_h = cb->args[0]; 5920 s_idx = cb->args[1]; 5921 5922 rcu_read_lock(); 5923 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 5924 idx = 0; 5925 head = &net->dev_index_head[h]; 5926 hlist_for_each_entry_rcu(dev, head, index_hlist) { 5927 if (idx < s_idx) 5928 goto cont; 5929 idev = __in6_dev_get(dev); 5930 if (!idev) 5931 goto cont; 5932 if (inet6_fill_ifinfo(skb, idev, 5933 NETLINK_CB(cb->skb).portid, 5934 cb->nlh->nlmsg_seq, 5935 RTM_NEWLINK, NLM_F_MULTI) < 0) 5936 goto out; 5937 cont: 5938 idx++; 5939 } 5940 } 5941 out: 5942 rcu_read_unlock(); 5943 cb->args[1] = idx; 5944 cb->args[0] = h; 5945 5946 return skb->len; 5947 } 5948 5949 void inet6_ifinfo_notify(int event, struct inet6_dev *idev) 5950 { 5951 struct sk_buff *skb; 5952 struct net *net = dev_net(idev->dev); 5953 int err = -ENOBUFS; 5954 5955 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC); 5956 if (!skb) 5957 goto errout; 5958 5959 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0); 5960 if (err < 0) { 5961 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */ 5962 WARN_ON(err == -EMSGSIZE); 5963 kfree_skb(skb); 5964 goto errout; 5965 } 5966 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC); 5967 return; 5968 errout: 5969 if (err < 0) 5970 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err); 5971 } 5972 5973 static inline size_t inet6_prefix_nlmsg_size(void) 5974 { 5975 return NLMSG_ALIGN(sizeof(struct prefixmsg)) 5976 + nla_total_size(sizeof(struct in6_addr)) 5977 + nla_total_size(sizeof(struct prefix_cacheinfo)); 5978 } 5979 5980 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev, 5981 struct prefix_info *pinfo, u32 portid, u32 seq, 5982 int event, unsigned int flags) 5983 { 5984 struct prefixmsg *pmsg; 5985 struct nlmsghdr *nlh; 5986 struct prefix_cacheinfo ci; 5987 5988 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags); 5989 if (!nlh) 5990 return -EMSGSIZE; 5991 5992 pmsg = nlmsg_data(nlh); 5993 pmsg->prefix_family = AF_INET6; 5994 pmsg->prefix_pad1 = 0; 5995 pmsg->prefix_pad2 = 0; 5996 pmsg->prefix_ifindex = idev->dev->ifindex; 5997 pmsg->prefix_len = pinfo->prefix_len; 5998 pmsg->prefix_type = pinfo->type; 5999 pmsg->prefix_pad3 = 0; 6000 pmsg->prefix_flags = 0; 6001 if (pinfo->onlink) 6002 pmsg->prefix_flags |= IF_PREFIX_ONLINK; 6003 if (pinfo->autoconf) 6004 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF; 6005 6006 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix)) 6007 goto nla_put_failure; 6008 ci.preferred_time = ntohl(pinfo->prefered); 6009 ci.valid_time = ntohl(pinfo->valid); 6010 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci)) 6011 goto nla_put_failure; 6012 nlmsg_end(skb, nlh); 6013 return 0; 6014 6015 nla_put_failure: 6016 nlmsg_cancel(skb, nlh); 6017 return -EMSGSIZE; 6018 } 6019 6020 static void inet6_prefix_notify(int event, struct inet6_dev *idev, 6021 struct prefix_info *pinfo) 6022 { 6023 struct sk_buff *skb; 6024 struct net *net = dev_net(idev->dev); 6025 int err = -ENOBUFS; 6026 6027 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC); 6028 if (!skb) 6029 goto errout; 6030 6031 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0); 6032 if (err < 0) { 6033 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */ 6034 WARN_ON(err == -EMSGSIZE); 6035 kfree_skb(skb); 6036 goto errout; 6037 } 6038 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC); 6039 return; 6040 errout: 6041 if (err < 0) 6042 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err); 6043 } 6044 6045 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 6046 { 6047 struct net *net = dev_net(ifp->idev->dev); 6048 6049 if (event) 6050 ASSERT_RTNL(); 6051 6052 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp); 6053 6054 switch (event) { 6055 case RTM_NEWADDR: 6056 /* 6057 * If the address was optimistic we inserted the route at the 6058 * start of our DAD process, so we don't need to do it again. 6059 * If the device was taken down in the middle of the DAD 6060 * cycle there is a race where we could get here without a 6061 * host route, so nothing to insert. That will be fixed when 6062 * the device is brought up. 6063 */ 6064 if (ifp->rt && !rcu_access_pointer(ifp->rt->fib6_node)) { 6065 ip6_ins_rt(net, ifp->rt); 6066 } else if (!ifp->rt && (ifp->idev->dev->flags & IFF_UP)) { 6067 pr_warn("BUG: Address %pI6c on device %s is missing its host route.\n", 6068 &ifp->addr, ifp->idev->dev->name); 6069 } 6070 6071 if (ifp->idev->cnf.forwarding) 6072 addrconf_join_anycast(ifp); 6073 if (!ipv6_addr_any(&ifp->peer_addr)) 6074 addrconf_prefix_route(&ifp->peer_addr, 128, 6075 ifp->rt_priority, ifp->idev->dev, 6076 0, 0, GFP_ATOMIC); 6077 break; 6078 case RTM_DELADDR: 6079 if (ifp->idev->cnf.forwarding) 6080 addrconf_leave_anycast(ifp); 6081 addrconf_leave_solict(ifp->idev, &ifp->addr); 6082 if (!ipv6_addr_any(&ifp->peer_addr)) { 6083 struct fib6_info *rt; 6084 6085 rt = addrconf_get_prefix_route(&ifp->peer_addr, 128, 6086 ifp->idev->dev, 0, 0, 6087 false); 6088 if (rt) 6089 ip6_del_rt(net, rt); 6090 } 6091 if (ifp->rt) { 6092 ip6_del_rt(net, ifp->rt); 6093 ifp->rt = NULL; 6094 } 6095 rt_genid_bump_ipv6(net); 6096 break; 6097 } 6098 atomic_inc(&net->ipv6.dev_addr_genid); 6099 } 6100 6101 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 6102 { 6103 rcu_read_lock_bh(); 6104 if (likely(ifp->idev->dead == 0)) 6105 __ipv6_ifa_notify(event, ifp); 6106 rcu_read_unlock_bh(); 6107 } 6108 6109 #ifdef CONFIG_SYSCTL 6110 6111 static 6112 int addrconf_sysctl_forward(struct ctl_table *ctl, int write, 6113 void __user *buffer, size_t *lenp, loff_t *ppos) 6114 { 6115 int *valp = ctl->data; 6116 int val = *valp; 6117 loff_t pos = *ppos; 6118 struct ctl_table lctl; 6119 int ret; 6120 6121 /* 6122 * ctl->data points to idev->cnf.forwarding, we should 6123 * not modify it until we get the rtnl lock. 6124 */ 6125 lctl = *ctl; 6126 lctl.data = &val; 6127 6128 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 6129 6130 if (write) 6131 ret = addrconf_fixup_forwarding(ctl, valp, val); 6132 if (ret) 6133 *ppos = pos; 6134 return ret; 6135 } 6136 6137 static 6138 int addrconf_sysctl_mtu(struct ctl_table *ctl, int write, 6139 void __user *buffer, size_t *lenp, loff_t *ppos) 6140 { 6141 struct inet6_dev *idev = ctl->extra1; 6142 int min_mtu = IPV6_MIN_MTU; 6143 struct ctl_table lctl; 6144 6145 lctl = *ctl; 6146 lctl.extra1 = &min_mtu; 6147 lctl.extra2 = idev ? &idev->dev->mtu : NULL; 6148 6149 return proc_dointvec_minmax(&lctl, write, buffer, lenp, ppos); 6150 } 6151 6152 static void dev_disable_change(struct inet6_dev *idev) 6153 { 6154 struct netdev_notifier_info info; 6155 6156 if (!idev || !idev->dev) 6157 return; 6158 6159 netdev_notifier_info_init(&info, idev->dev); 6160 if (idev->cnf.disable_ipv6) 6161 addrconf_notify(NULL, NETDEV_DOWN, &info); 6162 else 6163 addrconf_notify(NULL, NETDEV_UP, &info); 6164 } 6165 6166 static void addrconf_disable_change(struct net *net, __s32 newf) 6167 { 6168 struct net_device *dev; 6169 struct inet6_dev *idev; 6170 6171 for_each_netdev(net, dev) { 6172 idev = __in6_dev_get(dev); 6173 if (idev) { 6174 int changed = (!idev->cnf.disable_ipv6) ^ (!newf); 6175 idev->cnf.disable_ipv6 = newf; 6176 if (changed) 6177 dev_disable_change(idev); 6178 } 6179 } 6180 } 6181 6182 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf) 6183 { 6184 struct net *net; 6185 int old; 6186 6187 if (!rtnl_trylock()) 6188 return restart_syscall(); 6189 6190 net = (struct net *)table->extra2; 6191 old = *p; 6192 *p = newf; 6193 6194 if (p == &net->ipv6.devconf_dflt->disable_ipv6) { 6195 rtnl_unlock(); 6196 return 0; 6197 } 6198 6199 if (p == &net->ipv6.devconf_all->disable_ipv6) { 6200 net->ipv6.devconf_dflt->disable_ipv6 = newf; 6201 addrconf_disable_change(net, newf); 6202 } else if ((!newf) ^ (!old)) 6203 dev_disable_change((struct inet6_dev *)table->extra1); 6204 6205 rtnl_unlock(); 6206 return 0; 6207 } 6208 6209 static 6210 int addrconf_sysctl_disable(struct ctl_table *ctl, int write, 6211 void __user *buffer, size_t *lenp, loff_t *ppos) 6212 { 6213 int *valp = ctl->data; 6214 int val = *valp; 6215 loff_t pos = *ppos; 6216 struct ctl_table lctl; 6217 int ret; 6218 6219 /* 6220 * ctl->data points to idev->cnf.disable_ipv6, we should 6221 * not modify it until we get the rtnl lock. 6222 */ 6223 lctl = *ctl; 6224 lctl.data = &val; 6225 6226 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 6227 6228 if (write) 6229 ret = addrconf_disable_ipv6(ctl, valp, val); 6230 if (ret) 6231 *ppos = pos; 6232 return ret; 6233 } 6234 6235 static 6236 int addrconf_sysctl_proxy_ndp(struct ctl_table *ctl, int write, 6237 void __user *buffer, size_t *lenp, loff_t *ppos) 6238 { 6239 int *valp = ctl->data; 6240 int ret; 6241 int old, new; 6242 6243 old = *valp; 6244 ret = proc_dointvec(ctl, write, buffer, lenp, ppos); 6245 new = *valp; 6246 6247 if (write && old != new) { 6248 struct net *net = ctl->extra2; 6249 6250 if (!rtnl_trylock()) 6251 return restart_syscall(); 6252 6253 if (valp == &net->ipv6.devconf_dflt->proxy_ndp) 6254 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 6255 NETCONFA_PROXY_NEIGH, 6256 NETCONFA_IFINDEX_DEFAULT, 6257 net->ipv6.devconf_dflt); 6258 else if (valp == &net->ipv6.devconf_all->proxy_ndp) 6259 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 6260 NETCONFA_PROXY_NEIGH, 6261 NETCONFA_IFINDEX_ALL, 6262 net->ipv6.devconf_all); 6263 else { 6264 struct inet6_dev *idev = ctl->extra1; 6265 6266 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 6267 NETCONFA_PROXY_NEIGH, 6268 idev->dev->ifindex, 6269 &idev->cnf); 6270 } 6271 rtnl_unlock(); 6272 } 6273 6274 return ret; 6275 } 6276 6277 static int addrconf_sysctl_addr_gen_mode(struct ctl_table *ctl, int write, 6278 void __user *buffer, size_t *lenp, 6279 loff_t *ppos) 6280 { 6281 int ret = 0; 6282 u32 new_val; 6283 struct inet6_dev *idev = (struct inet6_dev *)ctl->extra1; 6284 struct net *net = (struct net *)ctl->extra2; 6285 struct ctl_table tmp = { 6286 .data = &new_val, 6287 .maxlen = sizeof(new_val), 6288 .mode = ctl->mode, 6289 }; 6290 6291 if (!rtnl_trylock()) 6292 return restart_syscall(); 6293 6294 new_val = *((u32 *)ctl->data); 6295 6296 ret = proc_douintvec(&tmp, write, buffer, lenp, ppos); 6297 if (ret != 0) 6298 goto out; 6299 6300 if (write) { 6301 if (check_addr_gen_mode(new_val) < 0) { 6302 ret = -EINVAL; 6303 goto out; 6304 } 6305 6306 if (idev) { 6307 if (check_stable_privacy(idev, net, new_val) < 0) { 6308 ret = -EINVAL; 6309 goto out; 6310 } 6311 6312 if (idev->cnf.addr_gen_mode != new_val) { 6313 idev->cnf.addr_gen_mode = new_val; 6314 addrconf_dev_config(idev->dev); 6315 } 6316 } else if (&net->ipv6.devconf_all->addr_gen_mode == ctl->data) { 6317 struct net_device *dev; 6318 6319 net->ipv6.devconf_dflt->addr_gen_mode = new_val; 6320 for_each_netdev(net, dev) { 6321 idev = __in6_dev_get(dev); 6322 if (idev && 6323 idev->cnf.addr_gen_mode != new_val) { 6324 idev->cnf.addr_gen_mode = new_val; 6325 addrconf_dev_config(idev->dev); 6326 } 6327 } 6328 } 6329 6330 *((u32 *)ctl->data) = new_val; 6331 } 6332 6333 out: 6334 rtnl_unlock(); 6335 6336 return ret; 6337 } 6338 6339 static int addrconf_sysctl_stable_secret(struct ctl_table *ctl, int write, 6340 void __user *buffer, size_t *lenp, 6341 loff_t *ppos) 6342 { 6343 int err; 6344 struct in6_addr addr; 6345 char str[IPV6_MAX_STRLEN]; 6346 struct ctl_table lctl = *ctl; 6347 struct net *net = ctl->extra2; 6348 struct ipv6_stable_secret *secret = ctl->data; 6349 6350 if (&net->ipv6.devconf_all->stable_secret == ctl->data) 6351 return -EIO; 6352 6353 lctl.maxlen = IPV6_MAX_STRLEN; 6354 lctl.data = str; 6355 6356 if (!rtnl_trylock()) 6357 return restart_syscall(); 6358 6359 if (!write && !secret->initialized) { 6360 err = -EIO; 6361 goto out; 6362 } 6363 6364 err = snprintf(str, sizeof(str), "%pI6", &secret->secret); 6365 if (err >= sizeof(str)) { 6366 err = -EIO; 6367 goto out; 6368 } 6369 6370 err = proc_dostring(&lctl, write, buffer, lenp, ppos); 6371 if (err || !write) 6372 goto out; 6373 6374 if (in6_pton(str, -1, addr.in6_u.u6_addr8, -1, NULL) != 1) { 6375 err = -EIO; 6376 goto out; 6377 } 6378 6379 secret->initialized = true; 6380 secret->secret = addr; 6381 6382 if (&net->ipv6.devconf_dflt->stable_secret == ctl->data) { 6383 struct net_device *dev; 6384 6385 for_each_netdev(net, dev) { 6386 struct inet6_dev *idev = __in6_dev_get(dev); 6387 6388 if (idev) { 6389 idev->cnf.addr_gen_mode = 6390 IN6_ADDR_GEN_MODE_STABLE_PRIVACY; 6391 } 6392 } 6393 } else { 6394 struct inet6_dev *idev = ctl->extra1; 6395 6396 idev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY; 6397 } 6398 6399 out: 6400 rtnl_unlock(); 6401 6402 return err; 6403 } 6404 6405 static 6406 int addrconf_sysctl_ignore_routes_with_linkdown(struct ctl_table *ctl, 6407 int write, 6408 void __user *buffer, 6409 size_t *lenp, 6410 loff_t *ppos) 6411 { 6412 int *valp = ctl->data; 6413 int val = *valp; 6414 loff_t pos = *ppos; 6415 struct ctl_table lctl; 6416 int ret; 6417 6418 /* ctl->data points to idev->cnf.ignore_routes_when_linkdown 6419 * we should not modify it until we get the rtnl lock. 6420 */ 6421 lctl = *ctl; 6422 lctl.data = &val; 6423 6424 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 6425 6426 if (write) 6427 ret = addrconf_fixup_linkdown(ctl, valp, val); 6428 if (ret) 6429 *ppos = pos; 6430 return ret; 6431 } 6432 6433 static 6434 void addrconf_set_nopolicy(struct rt6_info *rt, int action) 6435 { 6436 if (rt) { 6437 if (action) 6438 rt->dst.flags |= DST_NOPOLICY; 6439 else 6440 rt->dst.flags &= ~DST_NOPOLICY; 6441 } 6442 } 6443 6444 static 6445 void addrconf_disable_policy_idev(struct inet6_dev *idev, int val) 6446 { 6447 struct inet6_ifaddr *ifa; 6448 6449 read_lock_bh(&idev->lock); 6450 list_for_each_entry(ifa, &idev->addr_list, if_list) { 6451 spin_lock(&ifa->lock); 6452 if (ifa->rt) { 6453 /* host routes only use builtin fib6_nh */ 6454 struct fib6_nh *nh = ifa->rt->fib6_nh; 6455 int cpu; 6456 6457 rcu_read_lock(); 6458 ifa->rt->dst_nopolicy = val ? true : false; 6459 if (nh->rt6i_pcpu) { 6460 for_each_possible_cpu(cpu) { 6461 struct rt6_info **rtp; 6462 6463 rtp = per_cpu_ptr(nh->rt6i_pcpu, cpu); 6464 addrconf_set_nopolicy(*rtp, val); 6465 } 6466 } 6467 rcu_read_unlock(); 6468 } 6469 spin_unlock(&ifa->lock); 6470 } 6471 read_unlock_bh(&idev->lock); 6472 } 6473 6474 static 6475 int addrconf_disable_policy(struct ctl_table *ctl, int *valp, int val) 6476 { 6477 struct inet6_dev *idev; 6478 struct net *net; 6479 6480 if (!rtnl_trylock()) 6481 return restart_syscall(); 6482 6483 *valp = val; 6484 6485 net = (struct net *)ctl->extra2; 6486 if (valp == &net->ipv6.devconf_dflt->disable_policy) { 6487 rtnl_unlock(); 6488 return 0; 6489 } 6490 6491 if (valp == &net->ipv6.devconf_all->disable_policy) { 6492 struct net_device *dev; 6493 6494 for_each_netdev(net, dev) { 6495 idev = __in6_dev_get(dev); 6496 if (idev) 6497 addrconf_disable_policy_idev(idev, val); 6498 } 6499 } else { 6500 idev = (struct inet6_dev *)ctl->extra1; 6501 addrconf_disable_policy_idev(idev, val); 6502 } 6503 6504 rtnl_unlock(); 6505 return 0; 6506 } 6507 6508 static 6509 int addrconf_sysctl_disable_policy(struct ctl_table *ctl, int write, 6510 void __user *buffer, size_t *lenp, 6511 loff_t *ppos) 6512 { 6513 int *valp = ctl->data; 6514 int val = *valp; 6515 loff_t pos = *ppos; 6516 struct ctl_table lctl; 6517 int ret; 6518 6519 lctl = *ctl; 6520 lctl.data = &val; 6521 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 6522 6523 if (write && (*valp != val)) 6524 ret = addrconf_disable_policy(ctl, valp, val); 6525 6526 if (ret) 6527 *ppos = pos; 6528 6529 return ret; 6530 } 6531 6532 static int minus_one = -1; 6533 static const int two_five_five = 255; 6534 6535 static const struct ctl_table addrconf_sysctl[] = { 6536 { 6537 .procname = "forwarding", 6538 .data = &ipv6_devconf.forwarding, 6539 .maxlen = sizeof(int), 6540 .mode = 0644, 6541 .proc_handler = addrconf_sysctl_forward, 6542 }, 6543 { 6544 .procname = "hop_limit", 6545 .data = &ipv6_devconf.hop_limit, 6546 .maxlen = sizeof(int), 6547 .mode = 0644, 6548 .proc_handler = proc_dointvec_minmax, 6549 .extra1 = (void *)SYSCTL_ONE, 6550 .extra2 = (void *)&two_five_five, 6551 }, 6552 { 6553 .procname = "mtu", 6554 .data = &ipv6_devconf.mtu6, 6555 .maxlen = sizeof(int), 6556 .mode = 0644, 6557 .proc_handler = addrconf_sysctl_mtu, 6558 }, 6559 { 6560 .procname = "accept_ra", 6561 .data = &ipv6_devconf.accept_ra, 6562 .maxlen = sizeof(int), 6563 .mode = 0644, 6564 .proc_handler = proc_dointvec, 6565 }, 6566 { 6567 .procname = "accept_redirects", 6568 .data = &ipv6_devconf.accept_redirects, 6569 .maxlen = sizeof(int), 6570 .mode = 0644, 6571 .proc_handler = proc_dointvec, 6572 }, 6573 { 6574 .procname = "autoconf", 6575 .data = &ipv6_devconf.autoconf, 6576 .maxlen = sizeof(int), 6577 .mode = 0644, 6578 .proc_handler = proc_dointvec, 6579 }, 6580 { 6581 .procname = "dad_transmits", 6582 .data = &ipv6_devconf.dad_transmits, 6583 .maxlen = sizeof(int), 6584 .mode = 0644, 6585 .proc_handler = proc_dointvec, 6586 }, 6587 { 6588 .procname = "router_solicitations", 6589 .data = &ipv6_devconf.rtr_solicits, 6590 .maxlen = sizeof(int), 6591 .mode = 0644, 6592 .proc_handler = proc_dointvec_minmax, 6593 .extra1 = &minus_one, 6594 }, 6595 { 6596 .procname = "router_solicitation_interval", 6597 .data = &ipv6_devconf.rtr_solicit_interval, 6598 .maxlen = sizeof(int), 6599 .mode = 0644, 6600 .proc_handler = proc_dointvec_jiffies, 6601 }, 6602 { 6603 .procname = "router_solicitation_max_interval", 6604 .data = &ipv6_devconf.rtr_solicit_max_interval, 6605 .maxlen = sizeof(int), 6606 .mode = 0644, 6607 .proc_handler = proc_dointvec_jiffies, 6608 }, 6609 { 6610 .procname = "router_solicitation_delay", 6611 .data = &ipv6_devconf.rtr_solicit_delay, 6612 .maxlen = sizeof(int), 6613 .mode = 0644, 6614 .proc_handler = proc_dointvec_jiffies, 6615 }, 6616 { 6617 .procname = "force_mld_version", 6618 .data = &ipv6_devconf.force_mld_version, 6619 .maxlen = sizeof(int), 6620 .mode = 0644, 6621 .proc_handler = proc_dointvec, 6622 }, 6623 { 6624 .procname = "mldv1_unsolicited_report_interval", 6625 .data = 6626 &ipv6_devconf.mldv1_unsolicited_report_interval, 6627 .maxlen = sizeof(int), 6628 .mode = 0644, 6629 .proc_handler = proc_dointvec_ms_jiffies, 6630 }, 6631 { 6632 .procname = "mldv2_unsolicited_report_interval", 6633 .data = 6634 &ipv6_devconf.mldv2_unsolicited_report_interval, 6635 .maxlen = sizeof(int), 6636 .mode = 0644, 6637 .proc_handler = proc_dointvec_ms_jiffies, 6638 }, 6639 { 6640 .procname = "use_tempaddr", 6641 .data = &ipv6_devconf.use_tempaddr, 6642 .maxlen = sizeof(int), 6643 .mode = 0644, 6644 .proc_handler = proc_dointvec, 6645 }, 6646 { 6647 .procname = "temp_valid_lft", 6648 .data = &ipv6_devconf.temp_valid_lft, 6649 .maxlen = sizeof(int), 6650 .mode = 0644, 6651 .proc_handler = proc_dointvec, 6652 }, 6653 { 6654 .procname = "temp_prefered_lft", 6655 .data = &ipv6_devconf.temp_prefered_lft, 6656 .maxlen = sizeof(int), 6657 .mode = 0644, 6658 .proc_handler = proc_dointvec, 6659 }, 6660 { 6661 .procname = "regen_max_retry", 6662 .data = &ipv6_devconf.regen_max_retry, 6663 .maxlen = sizeof(int), 6664 .mode = 0644, 6665 .proc_handler = proc_dointvec, 6666 }, 6667 { 6668 .procname = "max_desync_factor", 6669 .data = &ipv6_devconf.max_desync_factor, 6670 .maxlen = sizeof(int), 6671 .mode = 0644, 6672 .proc_handler = proc_dointvec, 6673 }, 6674 { 6675 .procname = "max_addresses", 6676 .data = &ipv6_devconf.max_addresses, 6677 .maxlen = sizeof(int), 6678 .mode = 0644, 6679 .proc_handler = proc_dointvec, 6680 }, 6681 { 6682 .procname = "accept_ra_defrtr", 6683 .data = &ipv6_devconf.accept_ra_defrtr, 6684 .maxlen = sizeof(int), 6685 .mode = 0644, 6686 .proc_handler = proc_dointvec, 6687 }, 6688 { 6689 .procname = "accept_ra_min_hop_limit", 6690 .data = &ipv6_devconf.accept_ra_min_hop_limit, 6691 .maxlen = sizeof(int), 6692 .mode = 0644, 6693 .proc_handler = proc_dointvec, 6694 }, 6695 { 6696 .procname = "accept_ra_pinfo", 6697 .data = &ipv6_devconf.accept_ra_pinfo, 6698 .maxlen = sizeof(int), 6699 .mode = 0644, 6700 .proc_handler = proc_dointvec, 6701 }, 6702 #ifdef CONFIG_IPV6_ROUTER_PREF 6703 { 6704 .procname = "accept_ra_rtr_pref", 6705 .data = &ipv6_devconf.accept_ra_rtr_pref, 6706 .maxlen = sizeof(int), 6707 .mode = 0644, 6708 .proc_handler = proc_dointvec, 6709 }, 6710 { 6711 .procname = "router_probe_interval", 6712 .data = &ipv6_devconf.rtr_probe_interval, 6713 .maxlen = sizeof(int), 6714 .mode = 0644, 6715 .proc_handler = proc_dointvec_jiffies, 6716 }, 6717 #ifdef CONFIG_IPV6_ROUTE_INFO 6718 { 6719 .procname = "accept_ra_rt_info_min_plen", 6720 .data = &ipv6_devconf.accept_ra_rt_info_min_plen, 6721 .maxlen = sizeof(int), 6722 .mode = 0644, 6723 .proc_handler = proc_dointvec, 6724 }, 6725 { 6726 .procname = "accept_ra_rt_info_max_plen", 6727 .data = &ipv6_devconf.accept_ra_rt_info_max_plen, 6728 .maxlen = sizeof(int), 6729 .mode = 0644, 6730 .proc_handler = proc_dointvec, 6731 }, 6732 #endif 6733 #endif 6734 { 6735 .procname = "proxy_ndp", 6736 .data = &ipv6_devconf.proxy_ndp, 6737 .maxlen = sizeof(int), 6738 .mode = 0644, 6739 .proc_handler = addrconf_sysctl_proxy_ndp, 6740 }, 6741 { 6742 .procname = "accept_source_route", 6743 .data = &ipv6_devconf.accept_source_route, 6744 .maxlen = sizeof(int), 6745 .mode = 0644, 6746 .proc_handler = proc_dointvec, 6747 }, 6748 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 6749 { 6750 .procname = "optimistic_dad", 6751 .data = &ipv6_devconf.optimistic_dad, 6752 .maxlen = sizeof(int), 6753 .mode = 0644, 6754 .proc_handler = proc_dointvec, 6755 }, 6756 { 6757 .procname = "use_optimistic", 6758 .data = &ipv6_devconf.use_optimistic, 6759 .maxlen = sizeof(int), 6760 .mode = 0644, 6761 .proc_handler = proc_dointvec, 6762 }, 6763 #endif 6764 #ifdef CONFIG_IPV6_MROUTE 6765 { 6766 .procname = "mc_forwarding", 6767 .data = &ipv6_devconf.mc_forwarding, 6768 .maxlen = sizeof(int), 6769 .mode = 0444, 6770 .proc_handler = proc_dointvec, 6771 }, 6772 #endif 6773 { 6774 .procname = "disable_ipv6", 6775 .data = &ipv6_devconf.disable_ipv6, 6776 .maxlen = sizeof(int), 6777 .mode = 0644, 6778 .proc_handler = addrconf_sysctl_disable, 6779 }, 6780 { 6781 .procname = "accept_dad", 6782 .data = &ipv6_devconf.accept_dad, 6783 .maxlen = sizeof(int), 6784 .mode = 0644, 6785 .proc_handler = proc_dointvec, 6786 }, 6787 { 6788 .procname = "force_tllao", 6789 .data = &ipv6_devconf.force_tllao, 6790 .maxlen = sizeof(int), 6791 .mode = 0644, 6792 .proc_handler = proc_dointvec 6793 }, 6794 { 6795 .procname = "ndisc_notify", 6796 .data = &ipv6_devconf.ndisc_notify, 6797 .maxlen = sizeof(int), 6798 .mode = 0644, 6799 .proc_handler = proc_dointvec 6800 }, 6801 { 6802 .procname = "suppress_frag_ndisc", 6803 .data = &ipv6_devconf.suppress_frag_ndisc, 6804 .maxlen = sizeof(int), 6805 .mode = 0644, 6806 .proc_handler = proc_dointvec 6807 }, 6808 { 6809 .procname = "accept_ra_from_local", 6810 .data = &ipv6_devconf.accept_ra_from_local, 6811 .maxlen = sizeof(int), 6812 .mode = 0644, 6813 .proc_handler = proc_dointvec, 6814 }, 6815 { 6816 .procname = "accept_ra_mtu", 6817 .data = &ipv6_devconf.accept_ra_mtu, 6818 .maxlen = sizeof(int), 6819 .mode = 0644, 6820 .proc_handler = proc_dointvec, 6821 }, 6822 { 6823 .procname = "stable_secret", 6824 .data = &ipv6_devconf.stable_secret, 6825 .maxlen = IPV6_MAX_STRLEN, 6826 .mode = 0600, 6827 .proc_handler = addrconf_sysctl_stable_secret, 6828 }, 6829 { 6830 .procname = "use_oif_addrs_only", 6831 .data = &ipv6_devconf.use_oif_addrs_only, 6832 .maxlen = sizeof(int), 6833 .mode = 0644, 6834 .proc_handler = proc_dointvec, 6835 }, 6836 { 6837 .procname = "ignore_routes_with_linkdown", 6838 .data = &ipv6_devconf.ignore_routes_with_linkdown, 6839 .maxlen = sizeof(int), 6840 .mode = 0644, 6841 .proc_handler = addrconf_sysctl_ignore_routes_with_linkdown, 6842 }, 6843 { 6844 .procname = "drop_unicast_in_l2_multicast", 6845 .data = &ipv6_devconf.drop_unicast_in_l2_multicast, 6846 .maxlen = sizeof(int), 6847 .mode = 0644, 6848 .proc_handler = proc_dointvec, 6849 }, 6850 { 6851 .procname = "drop_unsolicited_na", 6852 .data = &ipv6_devconf.drop_unsolicited_na, 6853 .maxlen = sizeof(int), 6854 .mode = 0644, 6855 .proc_handler = proc_dointvec, 6856 }, 6857 { 6858 .procname = "keep_addr_on_down", 6859 .data = &ipv6_devconf.keep_addr_on_down, 6860 .maxlen = sizeof(int), 6861 .mode = 0644, 6862 .proc_handler = proc_dointvec, 6863 6864 }, 6865 { 6866 .procname = "seg6_enabled", 6867 .data = &ipv6_devconf.seg6_enabled, 6868 .maxlen = sizeof(int), 6869 .mode = 0644, 6870 .proc_handler = proc_dointvec, 6871 }, 6872 #ifdef CONFIG_IPV6_SEG6_HMAC 6873 { 6874 .procname = "seg6_require_hmac", 6875 .data = &ipv6_devconf.seg6_require_hmac, 6876 .maxlen = sizeof(int), 6877 .mode = 0644, 6878 .proc_handler = proc_dointvec, 6879 }, 6880 #endif 6881 { 6882 .procname = "enhanced_dad", 6883 .data = &ipv6_devconf.enhanced_dad, 6884 .maxlen = sizeof(int), 6885 .mode = 0644, 6886 .proc_handler = proc_dointvec, 6887 }, 6888 { 6889 .procname = "addr_gen_mode", 6890 .data = &ipv6_devconf.addr_gen_mode, 6891 .maxlen = sizeof(int), 6892 .mode = 0644, 6893 .proc_handler = addrconf_sysctl_addr_gen_mode, 6894 }, 6895 { 6896 .procname = "disable_policy", 6897 .data = &ipv6_devconf.disable_policy, 6898 .maxlen = sizeof(int), 6899 .mode = 0644, 6900 .proc_handler = addrconf_sysctl_disable_policy, 6901 }, 6902 { 6903 .procname = "ndisc_tclass", 6904 .data = &ipv6_devconf.ndisc_tclass, 6905 .maxlen = sizeof(int), 6906 .mode = 0644, 6907 .proc_handler = proc_dointvec_minmax, 6908 .extra1 = (void *)SYSCTL_ZERO, 6909 .extra2 = (void *)&two_five_five, 6910 }, 6911 { 6912 .procname = "rpl_seg_enabled", 6913 .data = &ipv6_devconf.rpl_seg_enabled, 6914 .maxlen = sizeof(int), 6915 .mode = 0644, 6916 .proc_handler = proc_dointvec, 6917 }, 6918 { 6919 /* sentinel */ 6920 } 6921 }; 6922 6923 static int __addrconf_sysctl_register(struct net *net, char *dev_name, 6924 struct inet6_dev *idev, struct ipv6_devconf *p) 6925 { 6926 int i, ifindex; 6927 struct ctl_table *table; 6928 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ]; 6929 6930 table = kmemdup(addrconf_sysctl, sizeof(addrconf_sysctl), GFP_KERNEL); 6931 if (!table) 6932 goto out; 6933 6934 for (i = 0; table[i].data; i++) { 6935 table[i].data += (char *)p - (char *)&ipv6_devconf; 6936 /* If one of these is already set, then it is not safe to 6937 * overwrite either of them: this makes proc_dointvec_minmax 6938 * usable. 6939 */ 6940 if (!table[i].extra1 && !table[i].extra2) { 6941 table[i].extra1 = idev; /* embedded; no ref */ 6942 table[i].extra2 = net; 6943 } 6944 } 6945 6946 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name); 6947 6948 p->sysctl_header = register_net_sysctl(net, path, table); 6949 if (!p->sysctl_header) 6950 goto free; 6951 6952 if (!strcmp(dev_name, "all")) 6953 ifindex = NETCONFA_IFINDEX_ALL; 6954 else if (!strcmp(dev_name, "default")) 6955 ifindex = NETCONFA_IFINDEX_DEFAULT; 6956 else 6957 ifindex = idev->dev->ifindex; 6958 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, NETCONFA_ALL, 6959 ifindex, p); 6960 return 0; 6961 6962 free: 6963 kfree(table); 6964 out: 6965 return -ENOBUFS; 6966 } 6967 6968 static void __addrconf_sysctl_unregister(struct net *net, 6969 struct ipv6_devconf *p, int ifindex) 6970 { 6971 struct ctl_table *table; 6972 6973 if (!p->sysctl_header) 6974 return; 6975 6976 table = p->sysctl_header->ctl_table_arg; 6977 unregister_net_sysctl_table(p->sysctl_header); 6978 p->sysctl_header = NULL; 6979 kfree(table); 6980 6981 inet6_netconf_notify_devconf(net, RTM_DELNETCONF, 0, ifindex, NULL); 6982 } 6983 6984 static int addrconf_sysctl_register(struct inet6_dev *idev) 6985 { 6986 int err; 6987 6988 if (!sysctl_dev_name_is_allowed(idev->dev->name)) 6989 return -EINVAL; 6990 6991 err = neigh_sysctl_register(idev->dev, idev->nd_parms, 6992 &ndisc_ifinfo_sysctl_change); 6993 if (err) 6994 return err; 6995 err = __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name, 6996 idev, &idev->cnf); 6997 if (err) 6998 neigh_sysctl_unregister(idev->nd_parms); 6999 7000 return err; 7001 } 7002 7003 static void addrconf_sysctl_unregister(struct inet6_dev *idev) 7004 { 7005 __addrconf_sysctl_unregister(dev_net(idev->dev), &idev->cnf, 7006 idev->dev->ifindex); 7007 neigh_sysctl_unregister(idev->nd_parms); 7008 } 7009 7010 7011 #endif 7012 7013 static int __net_init addrconf_init_net(struct net *net) 7014 { 7015 int err = -ENOMEM; 7016 struct ipv6_devconf *all, *dflt; 7017 7018 all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL); 7019 if (!all) 7020 goto err_alloc_all; 7021 7022 dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL); 7023 if (!dflt) 7024 goto err_alloc_dflt; 7025 7026 if (IS_ENABLED(CONFIG_SYSCTL) && 7027 sysctl_devconf_inherit_init_net == 1 && !net_eq(net, &init_net)) { 7028 memcpy(all, init_net.ipv6.devconf_all, sizeof(ipv6_devconf)); 7029 memcpy(dflt, init_net.ipv6.devconf_dflt, sizeof(ipv6_devconf_dflt)); 7030 } 7031 7032 /* these will be inherited by all namespaces */ 7033 dflt->autoconf = ipv6_defaults.autoconf; 7034 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6; 7035 7036 dflt->stable_secret.initialized = false; 7037 all->stable_secret.initialized = false; 7038 7039 net->ipv6.devconf_all = all; 7040 net->ipv6.devconf_dflt = dflt; 7041 7042 #ifdef CONFIG_SYSCTL 7043 err = __addrconf_sysctl_register(net, "all", NULL, all); 7044 if (err < 0) 7045 goto err_reg_all; 7046 7047 err = __addrconf_sysctl_register(net, "default", NULL, dflt); 7048 if (err < 0) 7049 goto err_reg_dflt; 7050 #endif 7051 return 0; 7052 7053 #ifdef CONFIG_SYSCTL 7054 err_reg_dflt: 7055 __addrconf_sysctl_unregister(net, all, NETCONFA_IFINDEX_ALL); 7056 err_reg_all: 7057 kfree(dflt); 7058 #endif 7059 err_alloc_dflt: 7060 kfree(all); 7061 err_alloc_all: 7062 return err; 7063 } 7064 7065 static void __net_exit addrconf_exit_net(struct net *net) 7066 { 7067 #ifdef CONFIG_SYSCTL 7068 __addrconf_sysctl_unregister(net, net->ipv6.devconf_dflt, 7069 NETCONFA_IFINDEX_DEFAULT); 7070 __addrconf_sysctl_unregister(net, net->ipv6.devconf_all, 7071 NETCONFA_IFINDEX_ALL); 7072 #endif 7073 kfree(net->ipv6.devconf_dflt); 7074 kfree(net->ipv6.devconf_all); 7075 } 7076 7077 static struct pernet_operations addrconf_ops = { 7078 .init = addrconf_init_net, 7079 .exit = addrconf_exit_net, 7080 }; 7081 7082 static struct rtnl_af_ops inet6_ops __read_mostly = { 7083 .family = AF_INET6, 7084 .fill_link_af = inet6_fill_link_af, 7085 .get_link_af_size = inet6_get_link_af_size, 7086 .validate_link_af = inet6_validate_link_af, 7087 .set_link_af = inet6_set_link_af, 7088 }; 7089 7090 /* 7091 * Init / cleanup code 7092 */ 7093 7094 int __init addrconf_init(void) 7095 { 7096 struct inet6_dev *idev; 7097 int i, err; 7098 7099 err = ipv6_addr_label_init(); 7100 if (err < 0) { 7101 pr_crit("%s: cannot initialize default policy table: %d\n", 7102 __func__, err); 7103 goto out; 7104 } 7105 7106 err = register_pernet_subsys(&addrconf_ops); 7107 if (err < 0) 7108 goto out_addrlabel; 7109 7110 addrconf_wq = create_workqueue("ipv6_addrconf"); 7111 if (!addrconf_wq) { 7112 err = -ENOMEM; 7113 goto out_nowq; 7114 } 7115 7116 /* The addrconf netdev notifier requires that loopback_dev 7117 * has it's ipv6 private information allocated and setup 7118 * before it can bring up and give link-local addresses 7119 * to other devices which are up. 7120 * 7121 * Unfortunately, loopback_dev is not necessarily the first 7122 * entry in the global dev_base list of net devices. In fact, 7123 * it is likely to be the very last entry on that list. 7124 * So this causes the notifier registry below to try and 7125 * give link-local addresses to all devices besides loopback_dev 7126 * first, then loopback_dev, which cases all the non-loopback_dev 7127 * devices to fail to get a link-local address. 7128 * 7129 * So, as a temporary fix, allocate the ipv6 structure for 7130 * loopback_dev first by hand. 7131 * Longer term, all of the dependencies ipv6 has upon the loopback 7132 * device and it being up should be removed. 7133 */ 7134 rtnl_lock(); 7135 idev = ipv6_add_dev(init_net.loopback_dev); 7136 rtnl_unlock(); 7137 if (IS_ERR(idev)) { 7138 err = PTR_ERR(idev); 7139 goto errlo; 7140 } 7141 7142 ip6_route_init_special_entries(); 7143 7144 for (i = 0; i < IN6_ADDR_HSIZE; i++) 7145 INIT_HLIST_HEAD(&inet6_addr_lst[i]); 7146 7147 register_netdevice_notifier(&ipv6_dev_notf); 7148 7149 addrconf_verify(); 7150 7151 rtnl_af_register(&inet6_ops); 7152 7153 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETLINK, 7154 NULL, inet6_dump_ifinfo, 0); 7155 if (err < 0) 7156 goto errout; 7157 7158 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_NEWADDR, 7159 inet6_rtm_newaddr, NULL, 0); 7160 if (err < 0) 7161 goto errout; 7162 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_DELADDR, 7163 inet6_rtm_deladdr, NULL, 0); 7164 if (err < 0) 7165 goto errout; 7166 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETADDR, 7167 inet6_rtm_getaddr, inet6_dump_ifaddr, 7168 RTNL_FLAG_DOIT_UNLOCKED); 7169 if (err < 0) 7170 goto errout; 7171 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETMULTICAST, 7172 NULL, inet6_dump_ifmcaddr, 0); 7173 if (err < 0) 7174 goto errout; 7175 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETANYCAST, 7176 NULL, inet6_dump_ifacaddr, 0); 7177 if (err < 0) 7178 goto errout; 7179 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETNETCONF, 7180 inet6_netconf_get_devconf, 7181 inet6_netconf_dump_devconf, 7182 RTNL_FLAG_DOIT_UNLOCKED); 7183 if (err < 0) 7184 goto errout; 7185 err = ipv6_addr_label_rtnl_register(); 7186 if (err < 0) 7187 goto errout; 7188 7189 return 0; 7190 errout: 7191 rtnl_unregister_all(PF_INET6); 7192 rtnl_af_unregister(&inet6_ops); 7193 unregister_netdevice_notifier(&ipv6_dev_notf); 7194 errlo: 7195 destroy_workqueue(addrconf_wq); 7196 out_nowq: 7197 unregister_pernet_subsys(&addrconf_ops); 7198 out_addrlabel: 7199 ipv6_addr_label_cleanup(); 7200 out: 7201 return err; 7202 } 7203 7204 void addrconf_cleanup(void) 7205 { 7206 struct net_device *dev; 7207 int i; 7208 7209 unregister_netdevice_notifier(&ipv6_dev_notf); 7210 unregister_pernet_subsys(&addrconf_ops); 7211 ipv6_addr_label_cleanup(); 7212 7213 rtnl_af_unregister(&inet6_ops); 7214 7215 rtnl_lock(); 7216 7217 /* clean dev list */ 7218 for_each_netdev(&init_net, dev) { 7219 if (__in6_dev_get(dev) == NULL) 7220 continue; 7221 addrconf_ifdown(dev, 1); 7222 } 7223 addrconf_ifdown(init_net.loopback_dev, 2); 7224 7225 /* 7226 * Check hash table. 7227 */ 7228 spin_lock_bh(&addrconf_hash_lock); 7229 for (i = 0; i < IN6_ADDR_HSIZE; i++) 7230 WARN_ON(!hlist_empty(&inet6_addr_lst[i])); 7231 spin_unlock_bh(&addrconf_hash_lock); 7232 cancel_delayed_work(&addr_chk_work); 7233 rtnl_unlock(); 7234 7235 destroy_workqueue(addrconf_wq); 7236 } 7237