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, false); 1242 else { 1243 if (!(f6i->fib6_flags & RTF_EXPIRES)) 1244 fib6_set_expires(f6i, expires); 1245 fib6_info_release(f6i); 1246 } 1247 } 1248 } 1249 1250 1251 /* This function wants to get referenced ifp and releases it before return */ 1252 1253 static void ipv6_del_addr(struct inet6_ifaddr *ifp) 1254 { 1255 int state; 1256 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_NOP; 1257 unsigned long expires; 1258 1259 ASSERT_RTNL(); 1260 1261 spin_lock_bh(&ifp->lock); 1262 state = ifp->state; 1263 ifp->state = INET6_IFADDR_STATE_DEAD; 1264 spin_unlock_bh(&ifp->lock); 1265 1266 if (state == INET6_IFADDR_STATE_DEAD) 1267 goto out; 1268 1269 spin_lock_bh(&addrconf_hash_lock); 1270 hlist_del_init_rcu(&ifp->addr_lst); 1271 spin_unlock_bh(&addrconf_hash_lock); 1272 1273 write_lock_bh(&ifp->idev->lock); 1274 1275 if (ifp->flags&IFA_F_TEMPORARY) { 1276 list_del(&ifp->tmp_list); 1277 if (ifp->ifpub) { 1278 in6_ifa_put(ifp->ifpub); 1279 ifp->ifpub = NULL; 1280 } 1281 __in6_ifa_put(ifp); 1282 } 1283 1284 if (ifp->flags & IFA_F_PERMANENT && !(ifp->flags & IFA_F_NOPREFIXROUTE)) 1285 action = check_cleanup_prefix_route(ifp, &expires); 1286 1287 list_del_rcu(&ifp->if_list); 1288 __in6_ifa_put(ifp); 1289 1290 write_unlock_bh(&ifp->idev->lock); 1291 1292 addrconf_del_dad_work(ifp); 1293 1294 ipv6_ifa_notify(RTM_DELADDR, ifp); 1295 1296 inet6addr_notifier_call_chain(NETDEV_DOWN, ifp); 1297 1298 if (action != CLEANUP_PREFIX_RT_NOP) { 1299 cleanup_prefix_route(ifp, expires, 1300 action == CLEANUP_PREFIX_RT_DEL, false); 1301 } 1302 1303 /* clean up prefsrc entries */ 1304 rt6_remove_prefsrc(ifp); 1305 out: 1306 in6_ifa_put(ifp); 1307 } 1308 1309 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, 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; 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 (RFC4862 5.5.3 e) 2612 * We deviate from RFC4862 by honoring all Valid Lifetimes to 2613 * improve the reaction of SLAAC to renumbering events 2614 * (draft-gont-6man-slaac-renum-06, Section 4.2) 2615 */ 2616 spin_lock_bh(&ifp->lock); 2617 now = jiffies; 2618 if (ifp->valid_lft > (now - ifp->tstamp) / HZ) 2619 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ; 2620 else 2621 stored_lft = 0; 2622 2623 if (!create && stored_lft) { 2624 ifp->valid_lft = valid_lft; 2625 ifp->prefered_lft = prefered_lft; 2626 ifp->tstamp = now; 2627 flags = ifp->flags; 2628 ifp->flags &= ~IFA_F_DEPRECATED; 2629 spin_unlock_bh(&ifp->lock); 2630 2631 if (!(flags&IFA_F_TENTATIVE)) 2632 ipv6_ifa_notify(0, ifp); 2633 } else 2634 spin_unlock_bh(&ifp->lock); 2635 2636 manage_tempaddrs(in6_dev, ifp, valid_lft, prefered_lft, 2637 create, now); 2638 2639 in6_ifa_put(ifp); 2640 addrconf_verify(); 2641 } 2642 2643 return 0; 2644 } 2645 EXPORT_SYMBOL_GPL(addrconf_prefix_rcv_add_addr); 2646 2647 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao) 2648 { 2649 struct prefix_info *pinfo; 2650 __u32 valid_lft; 2651 __u32 prefered_lft; 2652 int addr_type, err; 2653 u32 addr_flags = 0; 2654 struct inet6_dev *in6_dev; 2655 struct net *net = dev_net(dev); 2656 2657 pinfo = (struct prefix_info *) opt; 2658 2659 if (len < sizeof(struct prefix_info)) { 2660 netdev_dbg(dev, "addrconf: prefix option too short\n"); 2661 return; 2662 } 2663 2664 /* 2665 * Validation checks ([ADDRCONF], page 19) 2666 */ 2667 2668 addr_type = ipv6_addr_type(&pinfo->prefix); 2669 2670 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL)) 2671 return; 2672 2673 valid_lft = ntohl(pinfo->valid); 2674 prefered_lft = ntohl(pinfo->prefered); 2675 2676 if (prefered_lft > valid_lft) { 2677 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n"); 2678 return; 2679 } 2680 2681 in6_dev = in6_dev_get(dev); 2682 2683 if (!in6_dev) { 2684 net_dbg_ratelimited("addrconf: device %s not configured\n", 2685 dev->name); 2686 return; 2687 } 2688 2689 /* 2690 * Two things going on here: 2691 * 1) Add routes for on-link prefixes 2692 * 2) Configure prefixes with the auto flag set 2693 */ 2694 2695 if (pinfo->onlink) { 2696 struct fib6_info *rt; 2697 unsigned long rt_expires; 2698 2699 /* Avoid arithmetic overflow. Really, we could 2700 * save rt_expires in seconds, likely valid_lft, 2701 * but it would require division in fib gc, that it 2702 * not good. 2703 */ 2704 if (HZ > USER_HZ) 2705 rt_expires = addrconf_timeout_fixup(valid_lft, HZ); 2706 else 2707 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ); 2708 2709 if (addrconf_finite_timeout(rt_expires)) 2710 rt_expires *= HZ; 2711 2712 rt = addrconf_get_prefix_route(&pinfo->prefix, 2713 pinfo->prefix_len, 2714 dev, 2715 RTF_ADDRCONF | RTF_PREFIX_RT, 2716 RTF_DEFAULT, true); 2717 2718 if (rt) { 2719 /* Autoconf prefix route */ 2720 if (valid_lft == 0) { 2721 ip6_del_rt(net, rt, false); 2722 rt = NULL; 2723 } else if (addrconf_finite_timeout(rt_expires)) { 2724 /* not infinity */ 2725 fib6_set_expires(rt, jiffies + rt_expires); 2726 } else { 2727 fib6_clean_expires(rt); 2728 } 2729 } else if (valid_lft) { 2730 clock_t expires = 0; 2731 int flags = RTF_ADDRCONF | RTF_PREFIX_RT; 2732 if (addrconf_finite_timeout(rt_expires)) { 2733 /* not infinity */ 2734 flags |= RTF_EXPIRES; 2735 expires = jiffies_to_clock_t(rt_expires); 2736 } 2737 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len, 2738 0, dev, expires, flags, 2739 GFP_ATOMIC); 2740 } 2741 fib6_info_release(rt); 2742 } 2743 2744 /* Try to figure out our local address for this prefix */ 2745 2746 if (pinfo->autoconf && in6_dev->cnf.autoconf) { 2747 struct in6_addr addr; 2748 bool tokenized = false, dev_addr_generated = false; 2749 2750 if (pinfo->prefix_len == 64) { 2751 memcpy(&addr, &pinfo->prefix, 8); 2752 2753 if (!ipv6_addr_any(&in6_dev->token)) { 2754 read_lock_bh(&in6_dev->lock); 2755 memcpy(addr.s6_addr + 8, 2756 in6_dev->token.s6_addr + 8, 8); 2757 read_unlock_bh(&in6_dev->lock); 2758 tokenized = true; 2759 } else if (is_addr_mode_generate_stable(in6_dev) && 2760 !ipv6_generate_stable_address(&addr, 0, 2761 in6_dev)) { 2762 addr_flags |= IFA_F_STABLE_PRIVACY; 2763 goto ok; 2764 } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) && 2765 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) { 2766 goto put; 2767 } else { 2768 dev_addr_generated = true; 2769 } 2770 goto ok; 2771 } 2772 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n", 2773 pinfo->prefix_len); 2774 goto put; 2775 2776 ok: 2777 err = addrconf_prefix_rcv_add_addr(net, dev, pinfo, in6_dev, 2778 &addr, addr_type, 2779 addr_flags, sllao, 2780 tokenized, valid_lft, 2781 prefered_lft); 2782 if (err) 2783 goto put; 2784 2785 /* Ignore error case here because previous prefix add addr was 2786 * successful which will be notified. 2787 */ 2788 ndisc_ops_prefix_rcv_add_addr(net, dev, pinfo, in6_dev, &addr, 2789 addr_type, addr_flags, sllao, 2790 tokenized, valid_lft, 2791 prefered_lft, 2792 dev_addr_generated); 2793 } 2794 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo); 2795 put: 2796 in6_dev_put(in6_dev); 2797 } 2798 2799 /* 2800 * Set destination address. 2801 * Special case for SIT interfaces where we create a new "virtual" 2802 * device. 2803 */ 2804 int addrconf_set_dstaddr(struct net *net, void __user *arg) 2805 { 2806 struct in6_ifreq ireq; 2807 struct net_device *dev; 2808 int err = -EINVAL; 2809 2810 rtnl_lock(); 2811 2812 err = -EFAULT; 2813 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2814 goto err_exit; 2815 2816 dev = __dev_get_by_index(net, ireq.ifr6_ifindex); 2817 2818 err = -ENODEV; 2819 if (!dev) 2820 goto err_exit; 2821 2822 #if IS_ENABLED(CONFIG_IPV6_SIT) 2823 if (dev->type == ARPHRD_SIT) { 2824 const struct net_device_ops *ops = dev->netdev_ops; 2825 struct ifreq ifr; 2826 struct ip_tunnel_parm p; 2827 2828 err = -EADDRNOTAVAIL; 2829 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4)) 2830 goto err_exit; 2831 2832 memset(&p, 0, sizeof(p)); 2833 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3]; 2834 p.iph.saddr = 0; 2835 p.iph.version = 4; 2836 p.iph.ihl = 5; 2837 p.iph.protocol = IPPROTO_IPV6; 2838 p.iph.ttl = 64; 2839 ifr.ifr_ifru.ifru_data = (__force void __user *)&p; 2840 2841 if (ops->ndo_do_ioctl) { 2842 mm_segment_t oldfs = get_fs(); 2843 2844 set_fs(KERNEL_DS); 2845 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL); 2846 set_fs(oldfs); 2847 } else 2848 err = -EOPNOTSUPP; 2849 2850 if (err == 0) { 2851 err = -ENOBUFS; 2852 dev = __dev_get_by_name(net, p.name); 2853 if (!dev) 2854 goto err_exit; 2855 err = dev_open(dev, NULL); 2856 } 2857 } 2858 #endif 2859 2860 err_exit: 2861 rtnl_unlock(); 2862 return err; 2863 } 2864 2865 static int ipv6_mc_config(struct sock *sk, bool join, 2866 const struct in6_addr *addr, int ifindex) 2867 { 2868 int ret; 2869 2870 ASSERT_RTNL(); 2871 2872 lock_sock(sk); 2873 if (join) 2874 ret = ipv6_sock_mc_join(sk, ifindex, addr); 2875 else 2876 ret = ipv6_sock_mc_drop(sk, ifindex, addr); 2877 release_sock(sk); 2878 2879 return ret; 2880 } 2881 2882 /* 2883 * Manual configuration of address on an interface 2884 */ 2885 static int inet6_addr_add(struct net *net, int ifindex, 2886 struct ifa6_config *cfg, 2887 struct netlink_ext_ack *extack) 2888 { 2889 struct inet6_ifaddr *ifp; 2890 struct inet6_dev *idev; 2891 struct net_device *dev; 2892 unsigned long timeout; 2893 clock_t expires; 2894 u32 flags; 2895 2896 ASSERT_RTNL(); 2897 2898 if (cfg->plen > 128) 2899 return -EINVAL; 2900 2901 /* check the lifetime */ 2902 if (!cfg->valid_lft || cfg->preferred_lft > cfg->valid_lft) 2903 return -EINVAL; 2904 2905 if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR && cfg->plen != 64) 2906 return -EINVAL; 2907 2908 dev = __dev_get_by_index(net, ifindex); 2909 if (!dev) 2910 return -ENODEV; 2911 2912 idev = addrconf_add_dev(dev); 2913 if (IS_ERR(idev)) 2914 return PTR_ERR(idev); 2915 2916 if (cfg->ifa_flags & IFA_F_MCAUTOJOIN) { 2917 int ret = ipv6_mc_config(net->ipv6.mc_autojoin_sk, 2918 true, cfg->pfx, ifindex); 2919 2920 if (ret < 0) 2921 return ret; 2922 } 2923 2924 cfg->scope = ipv6_addr_scope(cfg->pfx); 2925 2926 timeout = addrconf_timeout_fixup(cfg->valid_lft, HZ); 2927 if (addrconf_finite_timeout(timeout)) { 2928 expires = jiffies_to_clock_t(timeout * HZ); 2929 cfg->valid_lft = timeout; 2930 flags = RTF_EXPIRES; 2931 } else { 2932 expires = 0; 2933 flags = 0; 2934 cfg->ifa_flags |= IFA_F_PERMANENT; 2935 } 2936 2937 timeout = addrconf_timeout_fixup(cfg->preferred_lft, HZ); 2938 if (addrconf_finite_timeout(timeout)) { 2939 if (timeout == 0) 2940 cfg->ifa_flags |= IFA_F_DEPRECATED; 2941 cfg->preferred_lft = timeout; 2942 } 2943 2944 ifp = ipv6_add_addr(idev, cfg, true, extack); 2945 if (!IS_ERR(ifp)) { 2946 if (!(cfg->ifa_flags & IFA_F_NOPREFIXROUTE)) { 2947 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, 2948 ifp->rt_priority, dev, expires, 2949 flags, GFP_KERNEL); 2950 } 2951 2952 /* Send a netlink notification if DAD is enabled and 2953 * optimistic flag is not set 2954 */ 2955 if (!(ifp->flags & (IFA_F_OPTIMISTIC | IFA_F_NODAD))) 2956 ipv6_ifa_notify(0, ifp); 2957 /* 2958 * Note that section 3.1 of RFC 4429 indicates 2959 * that the Optimistic flag should not be set for 2960 * manually configured addresses 2961 */ 2962 addrconf_dad_start(ifp); 2963 if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR) 2964 manage_tempaddrs(idev, ifp, cfg->valid_lft, 2965 cfg->preferred_lft, true, jiffies); 2966 in6_ifa_put(ifp); 2967 addrconf_verify_rtnl(); 2968 return 0; 2969 } else if (cfg->ifa_flags & IFA_F_MCAUTOJOIN) { 2970 ipv6_mc_config(net->ipv6.mc_autojoin_sk, false, 2971 cfg->pfx, ifindex); 2972 } 2973 2974 return PTR_ERR(ifp); 2975 } 2976 2977 static int inet6_addr_del(struct net *net, int ifindex, u32 ifa_flags, 2978 const struct in6_addr *pfx, unsigned int plen) 2979 { 2980 struct inet6_ifaddr *ifp; 2981 struct inet6_dev *idev; 2982 struct net_device *dev; 2983 2984 if (plen > 128) 2985 return -EINVAL; 2986 2987 dev = __dev_get_by_index(net, ifindex); 2988 if (!dev) 2989 return -ENODEV; 2990 2991 idev = __in6_dev_get(dev); 2992 if (!idev) 2993 return -ENXIO; 2994 2995 read_lock_bh(&idev->lock); 2996 list_for_each_entry(ifp, &idev->addr_list, if_list) { 2997 if (ifp->prefix_len == plen && 2998 ipv6_addr_equal(pfx, &ifp->addr)) { 2999 in6_ifa_hold(ifp); 3000 read_unlock_bh(&idev->lock); 3001 3002 if (!(ifp->flags & IFA_F_TEMPORARY) && 3003 (ifa_flags & IFA_F_MANAGETEMPADDR)) 3004 manage_tempaddrs(idev, ifp, 0, 0, false, 3005 jiffies); 3006 ipv6_del_addr(ifp); 3007 addrconf_verify_rtnl(); 3008 if (ipv6_addr_is_multicast(pfx)) { 3009 ipv6_mc_config(net->ipv6.mc_autojoin_sk, 3010 false, pfx, dev->ifindex); 3011 } 3012 return 0; 3013 } 3014 } 3015 read_unlock_bh(&idev->lock); 3016 return -EADDRNOTAVAIL; 3017 } 3018 3019 3020 int addrconf_add_ifaddr(struct net *net, void __user *arg) 3021 { 3022 struct ifa6_config cfg = { 3023 .ifa_flags = IFA_F_PERMANENT, 3024 .preferred_lft = INFINITY_LIFE_TIME, 3025 .valid_lft = INFINITY_LIFE_TIME, 3026 }; 3027 struct in6_ifreq ireq; 3028 int err; 3029 3030 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 3031 return -EPERM; 3032 3033 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 3034 return -EFAULT; 3035 3036 cfg.pfx = &ireq.ifr6_addr; 3037 cfg.plen = ireq.ifr6_prefixlen; 3038 3039 rtnl_lock(); 3040 err = inet6_addr_add(net, ireq.ifr6_ifindex, &cfg, NULL); 3041 rtnl_unlock(); 3042 return err; 3043 } 3044 3045 int addrconf_del_ifaddr(struct net *net, void __user *arg) 3046 { 3047 struct in6_ifreq ireq; 3048 int err; 3049 3050 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 3051 return -EPERM; 3052 3053 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 3054 return -EFAULT; 3055 3056 rtnl_lock(); 3057 err = inet6_addr_del(net, ireq.ifr6_ifindex, 0, &ireq.ifr6_addr, 3058 ireq.ifr6_prefixlen); 3059 rtnl_unlock(); 3060 return err; 3061 } 3062 3063 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr, 3064 int plen, int scope) 3065 { 3066 struct inet6_ifaddr *ifp; 3067 struct ifa6_config cfg = { 3068 .pfx = addr, 3069 .plen = plen, 3070 .ifa_flags = IFA_F_PERMANENT, 3071 .valid_lft = INFINITY_LIFE_TIME, 3072 .preferred_lft = INFINITY_LIFE_TIME, 3073 .scope = scope 3074 }; 3075 3076 ifp = ipv6_add_addr(idev, &cfg, true, NULL); 3077 if (!IS_ERR(ifp)) { 3078 spin_lock_bh(&ifp->lock); 3079 ifp->flags &= ~IFA_F_TENTATIVE; 3080 spin_unlock_bh(&ifp->lock); 3081 rt_genid_bump_ipv6(dev_net(idev->dev)); 3082 ipv6_ifa_notify(RTM_NEWADDR, ifp); 3083 in6_ifa_put(ifp); 3084 } 3085 } 3086 3087 #if IS_ENABLED(CONFIG_IPV6_SIT) 3088 static void sit_add_v4_addrs(struct inet6_dev *idev) 3089 { 3090 struct in6_addr addr; 3091 struct net_device *dev; 3092 struct net *net = dev_net(idev->dev); 3093 int scope, plen; 3094 u32 pflags = 0; 3095 3096 ASSERT_RTNL(); 3097 3098 memset(&addr, 0, sizeof(struct in6_addr)); 3099 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4); 3100 3101 if (idev->dev->flags&IFF_POINTOPOINT) { 3102 addr.s6_addr32[0] = htonl(0xfe800000); 3103 scope = IFA_LINK; 3104 plen = 64; 3105 } else { 3106 scope = IPV6_ADDR_COMPATv4; 3107 plen = 96; 3108 pflags |= RTF_NONEXTHOP; 3109 } 3110 3111 if (addr.s6_addr32[3]) { 3112 add_addr(idev, &addr, plen, scope); 3113 addrconf_prefix_route(&addr, plen, 0, idev->dev, 0, pflags, 3114 GFP_KERNEL); 3115 return; 3116 } 3117 3118 for_each_netdev(net, dev) { 3119 struct in_device *in_dev = __in_dev_get_rtnl(dev); 3120 if (in_dev && (dev->flags & IFF_UP)) { 3121 struct in_ifaddr *ifa; 3122 int flag = scope; 3123 3124 in_dev_for_each_ifa_rtnl(ifa, in_dev) { 3125 addr.s6_addr32[3] = ifa->ifa_local; 3126 3127 if (ifa->ifa_scope == RT_SCOPE_LINK) 3128 continue; 3129 if (ifa->ifa_scope >= RT_SCOPE_HOST) { 3130 if (idev->dev->flags&IFF_POINTOPOINT) 3131 continue; 3132 flag |= IFA_HOST; 3133 } 3134 3135 add_addr(idev, &addr, plen, flag); 3136 addrconf_prefix_route(&addr, plen, 0, idev->dev, 3137 0, pflags, GFP_KERNEL); 3138 } 3139 } 3140 } 3141 } 3142 #endif 3143 3144 static void init_loopback(struct net_device *dev) 3145 { 3146 struct inet6_dev *idev; 3147 3148 /* ::1 */ 3149 3150 ASSERT_RTNL(); 3151 3152 idev = ipv6_find_idev(dev); 3153 if (IS_ERR(idev)) { 3154 pr_debug("%s: add_dev failed\n", __func__); 3155 return; 3156 } 3157 3158 add_addr(idev, &in6addr_loopback, 128, IFA_HOST); 3159 } 3160 3161 void addrconf_add_linklocal(struct inet6_dev *idev, 3162 const struct in6_addr *addr, u32 flags) 3163 { 3164 struct ifa6_config cfg = { 3165 .pfx = addr, 3166 .plen = 64, 3167 .ifa_flags = flags | IFA_F_PERMANENT, 3168 .valid_lft = INFINITY_LIFE_TIME, 3169 .preferred_lft = INFINITY_LIFE_TIME, 3170 .scope = IFA_LINK 3171 }; 3172 struct inet6_ifaddr *ifp; 3173 3174 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 3175 if ((dev_net(idev->dev)->ipv6.devconf_all->optimistic_dad || 3176 idev->cnf.optimistic_dad) && 3177 !dev_net(idev->dev)->ipv6.devconf_all->forwarding) 3178 cfg.ifa_flags |= IFA_F_OPTIMISTIC; 3179 #endif 3180 3181 ifp = ipv6_add_addr(idev, &cfg, true, NULL); 3182 if (!IS_ERR(ifp)) { 3183 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, 0, idev->dev, 3184 0, 0, GFP_ATOMIC); 3185 addrconf_dad_start(ifp); 3186 in6_ifa_put(ifp); 3187 } 3188 } 3189 EXPORT_SYMBOL_GPL(addrconf_add_linklocal); 3190 3191 static bool ipv6_reserved_interfaceid(struct in6_addr address) 3192 { 3193 if ((address.s6_addr32[2] | address.s6_addr32[3]) == 0) 3194 return true; 3195 3196 if (address.s6_addr32[2] == htonl(0x02005eff) && 3197 ((address.s6_addr32[3] & htonl(0xfe000000)) == htonl(0xfe000000))) 3198 return true; 3199 3200 if (address.s6_addr32[2] == htonl(0xfdffffff) && 3201 ((address.s6_addr32[3] & htonl(0xffffff80)) == htonl(0xffffff80))) 3202 return true; 3203 3204 return false; 3205 } 3206 3207 static int ipv6_generate_stable_address(struct in6_addr *address, 3208 u8 dad_count, 3209 const struct inet6_dev *idev) 3210 { 3211 static DEFINE_SPINLOCK(lock); 3212 static __u32 digest[SHA_DIGEST_WORDS]; 3213 static __u32 workspace[SHA_WORKSPACE_WORDS]; 3214 3215 static union { 3216 char __data[SHA_MESSAGE_BYTES]; 3217 struct { 3218 struct in6_addr secret; 3219 __be32 prefix[2]; 3220 unsigned char hwaddr[MAX_ADDR_LEN]; 3221 u8 dad_count; 3222 } __packed; 3223 } data; 3224 3225 struct in6_addr secret; 3226 struct in6_addr temp; 3227 struct net *net = dev_net(idev->dev); 3228 3229 BUILD_BUG_ON(sizeof(data.__data) != sizeof(data)); 3230 3231 if (idev->cnf.stable_secret.initialized) 3232 secret = idev->cnf.stable_secret.secret; 3233 else if (net->ipv6.devconf_dflt->stable_secret.initialized) 3234 secret = net->ipv6.devconf_dflt->stable_secret.secret; 3235 else 3236 return -1; 3237 3238 retry: 3239 spin_lock_bh(&lock); 3240 3241 sha_init(digest); 3242 memset(&data, 0, sizeof(data)); 3243 memset(workspace, 0, sizeof(workspace)); 3244 memcpy(data.hwaddr, idev->dev->perm_addr, idev->dev->addr_len); 3245 data.prefix[0] = address->s6_addr32[0]; 3246 data.prefix[1] = address->s6_addr32[1]; 3247 data.secret = secret; 3248 data.dad_count = dad_count; 3249 3250 sha_transform(digest, data.__data, workspace); 3251 3252 temp = *address; 3253 temp.s6_addr32[2] = (__force __be32)digest[0]; 3254 temp.s6_addr32[3] = (__force __be32)digest[1]; 3255 3256 spin_unlock_bh(&lock); 3257 3258 if (ipv6_reserved_interfaceid(temp)) { 3259 dad_count++; 3260 if (dad_count > dev_net(idev->dev)->ipv6.sysctl.idgen_retries) 3261 return -1; 3262 goto retry; 3263 } 3264 3265 *address = temp; 3266 return 0; 3267 } 3268 3269 static void ipv6_gen_mode_random_init(struct inet6_dev *idev) 3270 { 3271 struct ipv6_stable_secret *s = &idev->cnf.stable_secret; 3272 3273 if (s->initialized) 3274 return; 3275 s = &idev->cnf.stable_secret; 3276 get_random_bytes(&s->secret, sizeof(s->secret)); 3277 s->initialized = true; 3278 } 3279 3280 static void addrconf_addr_gen(struct inet6_dev *idev, bool prefix_route) 3281 { 3282 struct in6_addr addr; 3283 3284 /* no link local addresses on L3 master devices */ 3285 if (netif_is_l3_master(idev->dev)) 3286 return; 3287 3288 /* no link local addresses on devices flagged as slaves */ 3289 if (idev->dev->flags & IFF_SLAVE) 3290 return; 3291 3292 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0); 3293 3294 switch (idev->cnf.addr_gen_mode) { 3295 case IN6_ADDR_GEN_MODE_RANDOM: 3296 ipv6_gen_mode_random_init(idev); 3297 fallthrough; 3298 case IN6_ADDR_GEN_MODE_STABLE_PRIVACY: 3299 if (!ipv6_generate_stable_address(&addr, 0, idev)) 3300 addrconf_add_linklocal(idev, &addr, 3301 IFA_F_STABLE_PRIVACY); 3302 else if (prefix_route) 3303 addrconf_prefix_route(&addr, 64, 0, idev->dev, 3304 0, 0, GFP_KERNEL); 3305 break; 3306 case IN6_ADDR_GEN_MODE_EUI64: 3307 /* addrconf_add_linklocal also adds a prefix_route and we 3308 * only need to care about prefix routes if ipv6_generate_eui64 3309 * couldn't generate one. 3310 */ 3311 if (ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) == 0) 3312 addrconf_add_linklocal(idev, &addr, 0); 3313 else if (prefix_route) 3314 addrconf_prefix_route(&addr, 64, 0, idev->dev, 3315 0, 0, GFP_KERNEL); 3316 break; 3317 case IN6_ADDR_GEN_MODE_NONE: 3318 default: 3319 /* will not add any link local address */ 3320 break; 3321 } 3322 } 3323 3324 static void addrconf_dev_config(struct net_device *dev) 3325 { 3326 struct inet6_dev *idev; 3327 3328 ASSERT_RTNL(); 3329 3330 if ((dev->type != ARPHRD_ETHER) && 3331 (dev->type != ARPHRD_FDDI) && 3332 (dev->type != ARPHRD_ARCNET) && 3333 (dev->type != ARPHRD_INFINIBAND) && 3334 (dev->type != ARPHRD_IEEE1394) && 3335 (dev->type != ARPHRD_TUNNEL6) && 3336 (dev->type != ARPHRD_6LOWPAN) && 3337 (dev->type != ARPHRD_IP6GRE) && 3338 (dev->type != ARPHRD_IPGRE) && 3339 (dev->type != ARPHRD_TUNNEL) && 3340 (dev->type != ARPHRD_NONE) && 3341 (dev->type != ARPHRD_RAWIP)) { 3342 /* Alas, we support only Ethernet autoconfiguration. */ 3343 idev = __in6_dev_get(dev); 3344 if (!IS_ERR_OR_NULL(idev) && dev->flags & IFF_UP && 3345 dev->flags & IFF_MULTICAST) 3346 ipv6_mc_up(idev); 3347 return; 3348 } 3349 3350 idev = addrconf_add_dev(dev); 3351 if (IS_ERR(idev)) 3352 return; 3353 3354 /* this device type has no EUI support */ 3355 if (dev->type == ARPHRD_NONE && 3356 idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_EUI64) 3357 idev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_RANDOM; 3358 3359 addrconf_addr_gen(idev, false); 3360 } 3361 3362 #if IS_ENABLED(CONFIG_IPV6_SIT) 3363 static void addrconf_sit_config(struct net_device *dev) 3364 { 3365 struct inet6_dev *idev; 3366 3367 ASSERT_RTNL(); 3368 3369 /* 3370 * Configure the tunnel with one of our IPv4 3371 * addresses... we should configure all of 3372 * our v4 addrs in the tunnel 3373 */ 3374 3375 idev = ipv6_find_idev(dev); 3376 if (IS_ERR(idev)) { 3377 pr_debug("%s: add_dev failed\n", __func__); 3378 return; 3379 } 3380 3381 if (dev->priv_flags & IFF_ISATAP) { 3382 addrconf_addr_gen(idev, false); 3383 return; 3384 } 3385 3386 sit_add_v4_addrs(idev); 3387 3388 if (dev->flags&IFF_POINTOPOINT) 3389 addrconf_add_mroute(dev); 3390 } 3391 #endif 3392 3393 #if IS_ENABLED(CONFIG_NET_IPGRE) 3394 static void addrconf_gre_config(struct net_device *dev) 3395 { 3396 struct inet6_dev *idev; 3397 3398 ASSERT_RTNL(); 3399 3400 idev = ipv6_find_idev(dev); 3401 if (IS_ERR(idev)) { 3402 pr_debug("%s: add_dev failed\n", __func__); 3403 return; 3404 } 3405 3406 addrconf_addr_gen(idev, true); 3407 if (dev->flags & IFF_POINTOPOINT) 3408 addrconf_add_mroute(dev); 3409 } 3410 #endif 3411 3412 static int fixup_permanent_addr(struct net *net, 3413 struct inet6_dev *idev, 3414 struct inet6_ifaddr *ifp) 3415 { 3416 /* !fib6_node means the host route was removed from the 3417 * FIB, for example, if 'lo' device is taken down. In that 3418 * case regenerate the host route. 3419 */ 3420 if (!ifp->rt || !ifp->rt->fib6_node) { 3421 struct fib6_info *f6i, *prev; 3422 3423 f6i = addrconf_f6i_alloc(net, idev, &ifp->addr, false, 3424 GFP_ATOMIC); 3425 if (IS_ERR(f6i)) 3426 return PTR_ERR(f6i); 3427 3428 /* ifp->rt can be accessed outside of rtnl */ 3429 spin_lock(&ifp->lock); 3430 prev = ifp->rt; 3431 ifp->rt = f6i; 3432 spin_unlock(&ifp->lock); 3433 3434 fib6_info_release(prev); 3435 } 3436 3437 if (!(ifp->flags & IFA_F_NOPREFIXROUTE)) { 3438 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, 3439 ifp->rt_priority, idev->dev, 0, 0, 3440 GFP_ATOMIC); 3441 } 3442 3443 if (ifp->state == INET6_IFADDR_STATE_PREDAD) 3444 addrconf_dad_start(ifp); 3445 3446 return 0; 3447 } 3448 3449 static void addrconf_permanent_addr(struct net *net, struct net_device *dev) 3450 { 3451 struct inet6_ifaddr *ifp, *tmp; 3452 struct inet6_dev *idev; 3453 3454 idev = __in6_dev_get(dev); 3455 if (!idev) 3456 return; 3457 3458 write_lock_bh(&idev->lock); 3459 3460 list_for_each_entry_safe(ifp, tmp, &idev->addr_list, if_list) { 3461 if ((ifp->flags & IFA_F_PERMANENT) && 3462 fixup_permanent_addr(net, idev, ifp) < 0) { 3463 write_unlock_bh(&idev->lock); 3464 in6_ifa_hold(ifp); 3465 ipv6_del_addr(ifp); 3466 write_lock_bh(&idev->lock); 3467 3468 net_info_ratelimited("%s: Failed to add prefix route for address %pI6c; dropping\n", 3469 idev->dev->name, &ifp->addr); 3470 } 3471 } 3472 3473 write_unlock_bh(&idev->lock); 3474 } 3475 3476 static int addrconf_notify(struct notifier_block *this, unsigned long event, 3477 void *ptr) 3478 { 3479 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 3480 struct netdev_notifier_change_info *change_info; 3481 struct netdev_notifier_changeupper_info *info; 3482 struct inet6_dev *idev = __in6_dev_get(dev); 3483 struct net *net = dev_net(dev); 3484 int run_pending = 0; 3485 int err; 3486 3487 switch (event) { 3488 case NETDEV_REGISTER: 3489 if (!idev && dev->mtu >= IPV6_MIN_MTU) { 3490 idev = ipv6_add_dev(dev); 3491 if (IS_ERR(idev)) 3492 return notifier_from_errno(PTR_ERR(idev)); 3493 } 3494 break; 3495 3496 case NETDEV_CHANGEMTU: 3497 /* if MTU under IPV6_MIN_MTU stop IPv6 on this interface. */ 3498 if (dev->mtu < IPV6_MIN_MTU) { 3499 addrconf_ifdown(dev, dev != net->loopback_dev); 3500 break; 3501 } 3502 3503 if (idev) { 3504 rt6_mtu_change(dev, dev->mtu); 3505 idev->cnf.mtu6 = dev->mtu; 3506 break; 3507 } 3508 3509 /* allocate new idev */ 3510 idev = ipv6_add_dev(dev); 3511 if (IS_ERR(idev)) 3512 break; 3513 3514 /* device is still not ready */ 3515 if (!(idev->if_flags & IF_READY)) 3516 break; 3517 3518 run_pending = 1; 3519 fallthrough; 3520 case NETDEV_UP: 3521 case NETDEV_CHANGE: 3522 if (dev->flags & IFF_SLAVE) 3523 break; 3524 3525 if (idev && idev->cnf.disable_ipv6) 3526 break; 3527 3528 if (event == NETDEV_UP) { 3529 /* restore routes for permanent addresses */ 3530 addrconf_permanent_addr(net, dev); 3531 3532 if (!addrconf_link_ready(dev)) { 3533 /* device is not ready yet. */ 3534 pr_debug("ADDRCONF(NETDEV_UP): %s: link is not ready\n", 3535 dev->name); 3536 break; 3537 } 3538 3539 if (!idev && dev->mtu >= IPV6_MIN_MTU) 3540 idev = ipv6_add_dev(dev); 3541 3542 if (!IS_ERR_OR_NULL(idev)) { 3543 idev->if_flags |= IF_READY; 3544 run_pending = 1; 3545 } 3546 } else if (event == NETDEV_CHANGE) { 3547 if (!addrconf_link_ready(dev)) { 3548 /* device is still not ready. */ 3549 rt6_sync_down_dev(dev, event); 3550 break; 3551 } 3552 3553 if (!IS_ERR_OR_NULL(idev)) { 3554 if (idev->if_flags & IF_READY) { 3555 /* device is already configured - 3556 * but resend MLD reports, we might 3557 * have roamed and need to update 3558 * multicast snooping switches 3559 */ 3560 ipv6_mc_up(idev); 3561 change_info = ptr; 3562 if (change_info->flags_changed & IFF_NOARP) 3563 addrconf_dad_run(idev, true); 3564 rt6_sync_up(dev, RTNH_F_LINKDOWN); 3565 break; 3566 } 3567 idev->if_flags |= IF_READY; 3568 } 3569 3570 pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n", 3571 dev->name); 3572 3573 run_pending = 1; 3574 } 3575 3576 switch (dev->type) { 3577 #if IS_ENABLED(CONFIG_IPV6_SIT) 3578 case ARPHRD_SIT: 3579 addrconf_sit_config(dev); 3580 break; 3581 #endif 3582 #if IS_ENABLED(CONFIG_NET_IPGRE) 3583 case ARPHRD_IPGRE: 3584 addrconf_gre_config(dev); 3585 break; 3586 #endif 3587 case ARPHRD_LOOPBACK: 3588 init_loopback(dev); 3589 break; 3590 3591 default: 3592 addrconf_dev_config(dev); 3593 break; 3594 } 3595 3596 if (!IS_ERR_OR_NULL(idev)) { 3597 if (run_pending) 3598 addrconf_dad_run(idev, false); 3599 3600 /* Device has an address by now */ 3601 rt6_sync_up(dev, RTNH_F_DEAD); 3602 3603 /* 3604 * If the MTU changed during the interface down, 3605 * when the interface up, the changed MTU must be 3606 * reflected in the idev as well as routers. 3607 */ 3608 if (idev->cnf.mtu6 != dev->mtu && 3609 dev->mtu >= IPV6_MIN_MTU) { 3610 rt6_mtu_change(dev, dev->mtu); 3611 idev->cnf.mtu6 = dev->mtu; 3612 } 3613 idev->tstamp = jiffies; 3614 inet6_ifinfo_notify(RTM_NEWLINK, idev); 3615 3616 /* 3617 * If the changed mtu during down is lower than 3618 * IPV6_MIN_MTU stop IPv6 on this interface. 3619 */ 3620 if (dev->mtu < IPV6_MIN_MTU) 3621 addrconf_ifdown(dev, dev != net->loopback_dev); 3622 } 3623 break; 3624 3625 case NETDEV_DOWN: 3626 case NETDEV_UNREGISTER: 3627 /* 3628 * Remove all addresses from this interface. 3629 */ 3630 addrconf_ifdown(dev, event != NETDEV_DOWN); 3631 break; 3632 3633 case NETDEV_CHANGENAME: 3634 if (idev) { 3635 snmp6_unregister_dev(idev); 3636 addrconf_sysctl_unregister(idev); 3637 err = addrconf_sysctl_register(idev); 3638 if (err) 3639 return notifier_from_errno(err); 3640 err = snmp6_register_dev(idev); 3641 if (err) { 3642 addrconf_sysctl_unregister(idev); 3643 return notifier_from_errno(err); 3644 } 3645 } 3646 break; 3647 3648 case NETDEV_PRE_TYPE_CHANGE: 3649 case NETDEV_POST_TYPE_CHANGE: 3650 if (idev) 3651 addrconf_type_change(dev, event); 3652 break; 3653 3654 case NETDEV_CHANGEUPPER: 3655 info = ptr; 3656 3657 /* flush all routes if dev is linked to or unlinked from 3658 * an L3 master device (e.g., VRF) 3659 */ 3660 if (info->upper_dev && netif_is_l3_master(info->upper_dev)) 3661 addrconf_ifdown(dev, 0); 3662 } 3663 3664 return NOTIFY_OK; 3665 } 3666 3667 /* 3668 * addrconf module should be notified of a device going up 3669 */ 3670 static struct notifier_block ipv6_dev_notf = { 3671 .notifier_call = addrconf_notify, 3672 .priority = ADDRCONF_NOTIFY_PRIORITY, 3673 }; 3674 3675 static void addrconf_type_change(struct net_device *dev, unsigned long event) 3676 { 3677 struct inet6_dev *idev; 3678 ASSERT_RTNL(); 3679 3680 idev = __in6_dev_get(dev); 3681 3682 if (event == NETDEV_POST_TYPE_CHANGE) 3683 ipv6_mc_remap(idev); 3684 else if (event == NETDEV_PRE_TYPE_CHANGE) 3685 ipv6_mc_unmap(idev); 3686 } 3687 3688 static bool addr_is_local(const struct in6_addr *addr) 3689 { 3690 return ipv6_addr_type(addr) & 3691 (IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK); 3692 } 3693 3694 static int addrconf_ifdown(struct net_device *dev, int how) 3695 { 3696 unsigned long event = how ? NETDEV_UNREGISTER : NETDEV_DOWN; 3697 struct net *net = dev_net(dev); 3698 struct inet6_dev *idev; 3699 struct inet6_ifaddr *ifa, *tmp; 3700 bool keep_addr = false; 3701 int state, i; 3702 3703 ASSERT_RTNL(); 3704 3705 rt6_disable_ip(dev, event); 3706 3707 idev = __in6_dev_get(dev); 3708 if (!idev) 3709 return -ENODEV; 3710 3711 /* 3712 * Step 1: remove reference to ipv6 device from parent device. 3713 * Do not dev_put! 3714 */ 3715 if (how) { 3716 idev->dead = 1; 3717 3718 /* protected by rtnl_lock */ 3719 RCU_INIT_POINTER(dev->ip6_ptr, NULL); 3720 3721 /* Step 1.5: remove snmp6 entry */ 3722 snmp6_unregister_dev(idev); 3723 3724 } 3725 3726 /* combine the user config with event to determine if permanent 3727 * addresses are to be removed from address hash table 3728 */ 3729 if (!how && !idev->cnf.disable_ipv6) { 3730 /* aggregate the system setting and interface setting */ 3731 int _keep_addr = net->ipv6.devconf_all->keep_addr_on_down; 3732 3733 if (!_keep_addr) 3734 _keep_addr = idev->cnf.keep_addr_on_down; 3735 3736 keep_addr = (_keep_addr > 0); 3737 } 3738 3739 /* Step 2: clear hash table */ 3740 for (i = 0; i < IN6_ADDR_HSIZE; i++) { 3741 struct hlist_head *h = &inet6_addr_lst[i]; 3742 3743 spin_lock_bh(&addrconf_hash_lock); 3744 restart: 3745 hlist_for_each_entry_rcu(ifa, h, addr_lst) { 3746 if (ifa->idev == idev) { 3747 addrconf_del_dad_work(ifa); 3748 /* combined flag + permanent flag decide if 3749 * address is retained on a down event 3750 */ 3751 if (!keep_addr || 3752 !(ifa->flags & IFA_F_PERMANENT) || 3753 addr_is_local(&ifa->addr)) { 3754 hlist_del_init_rcu(&ifa->addr_lst); 3755 goto restart; 3756 } 3757 } 3758 } 3759 spin_unlock_bh(&addrconf_hash_lock); 3760 } 3761 3762 write_lock_bh(&idev->lock); 3763 3764 addrconf_del_rs_timer(idev); 3765 3766 /* Step 2: clear flags for stateless addrconf */ 3767 if (!how) 3768 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY); 3769 3770 /* Step 3: clear tempaddr list */ 3771 while (!list_empty(&idev->tempaddr_list)) { 3772 ifa = list_first_entry(&idev->tempaddr_list, 3773 struct inet6_ifaddr, tmp_list); 3774 list_del(&ifa->tmp_list); 3775 write_unlock_bh(&idev->lock); 3776 spin_lock_bh(&ifa->lock); 3777 3778 if (ifa->ifpub) { 3779 in6_ifa_put(ifa->ifpub); 3780 ifa->ifpub = NULL; 3781 } 3782 spin_unlock_bh(&ifa->lock); 3783 in6_ifa_put(ifa); 3784 write_lock_bh(&idev->lock); 3785 } 3786 3787 list_for_each_entry_safe(ifa, tmp, &idev->addr_list, if_list) { 3788 struct fib6_info *rt = NULL; 3789 bool keep; 3790 3791 addrconf_del_dad_work(ifa); 3792 3793 keep = keep_addr && (ifa->flags & IFA_F_PERMANENT) && 3794 !addr_is_local(&ifa->addr); 3795 3796 write_unlock_bh(&idev->lock); 3797 spin_lock_bh(&ifa->lock); 3798 3799 if (keep) { 3800 /* set state to skip the notifier below */ 3801 state = INET6_IFADDR_STATE_DEAD; 3802 ifa->state = INET6_IFADDR_STATE_PREDAD; 3803 if (!(ifa->flags & IFA_F_NODAD)) 3804 ifa->flags |= IFA_F_TENTATIVE; 3805 3806 rt = ifa->rt; 3807 ifa->rt = NULL; 3808 } else { 3809 state = ifa->state; 3810 ifa->state = INET6_IFADDR_STATE_DEAD; 3811 } 3812 3813 spin_unlock_bh(&ifa->lock); 3814 3815 if (rt) 3816 ip6_del_rt(net, rt, false); 3817 3818 if (state != INET6_IFADDR_STATE_DEAD) { 3819 __ipv6_ifa_notify(RTM_DELADDR, ifa); 3820 inet6addr_notifier_call_chain(NETDEV_DOWN, ifa); 3821 } else { 3822 if (idev->cnf.forwarding) 3823 addrconf_leave_anycast(ifa); 3824 addrconf_leave_solict(ifa->idev, &ifa->addr); 3825 } 3826 3827 write_lock_bh(&idev->lock); 3828 if (!keep) { 3829 list_del_rcu(&ifa->if_list); 3830 in6_ifa_put(ifa); 3831 } 3832 } 3833 3834 write_unlock_bh(&idev->lock); 3835 3836 /* Step 5: Discard anycast and multicast list */ 3837 if (how) { 3838 ipv6_ac_destroy_dev(idev); 3839 ipv6_mc_destroy_dev(idev); 3840 } else { 3841 ipv6_mc_down(idev); 3842 } 3843 3844 idev->tstamp = jiffies; 3845 3846 /* Last: Shot the device (if unregistered) */ 3847 if (how) { 3848 addrconf_sysctl_unregister(idev); 3849 neigh_parms_release(&nd_tbl, idev->nd_parms); 3850 neigh_ifdown(&nd_tbl, dev); 3851 in6_dev_put(idev); 3852 } 3853 return 0; 3854 } 3855 3856 static void addrconf_rs_timer(struct timer_list *t) 3857 { 3858 struct inet6_dev *idev = from_timer(idev, t, rs_timer); 3859 struct net_device *dev = idev->dev; 3860 struct in6_addr lladdr; 3861 3862 write_lock(&idev->lock); 3863 if (idev->dead || !(idev->if_flags & IF_READY)) 3864 goto out; 3865 3866 if (!ipv6_accept_ra(idev)) 3867 goto out; 3868 3869 /* Announcement received after solicitation was sent */ 3870 if (idev->if_flags & IF_RA_RCVD) 3871 goto out; 3872 3873 if (idev->rs_probes++ < idev->cnf.rtr_solicits || idev->cnf.rtr_solicits < 0) { 3874 write_unlock(&idev->lock); 3875 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE)) 3876 ndisc_send_rs(dev, &lladdr, 3877 &in6addr_linklocal_allrouters); 3878 else 3879 goto put; 3880 3881 write_lock(&idev->lock); 3882 idev->rs_interval = rfc3315_s14_backoff_update( 3883 idev->rs_interval, idev->cnf.rtr_solicit_max_interval); 3884 /* The wait after the last probe can be shorter */ 3885 addrconf_mod_rs_timer(idev, (idev->rs_probes == 3886 idev->cnf.rtr_solicits) ? 3887 idev->cnf.rtr_solicit_delay : 3888 idev->rs_interval); 3889 } else { 3890 /* 3891 * Note: we do not support deprecated "all on-link" 3892 * assumption any longer. 3893 */ 3894 pr_debug("%s: no IPv6 routers present\n", idev->dev->name); 3895 } 3896 3897 out: 3898 write_unlock(&idev->lock); 3899 put: 3900 in6_dev_put(idev); 3901 } 3902 3903 /* 3904 * Duplicate Address Detection 3905 */ 3906 static void addrconf_dad_kick(struct inet6_ifaddr *ifp) 3907 { 3908 unsigned long rand_num; 3909 struct inet6_dev *idev = ifp->idev; 3910 u64 nonce; 3911 3912 if (ifp->flags & IFA_F_OPTIMISTIC) 3913 rand_num = 0; 3914 else 3915 rand_num = prandom_u32() % (idev->cnf.rtr_solicit_delay ? : 1); 3916 3917 nonce = 0; 3918 if (idev->cnf.enhanced_dad || 3919 dev_net(idev->dev)->ipv6.devconf_all->enhanced_dad) { 3920 do 3921 get_random_bytes(&nonce, 6); 3922 while (nonce == 0); 3923 } 3924 ifp->dad_nonce = nonce; 3925 ifp->dad_probes = idev->cnf.dad_transmits; 3926 addrconf_mod_dad_work(ifp, rand_num); 3927 } 3928 3929 static void addrconf_dad_begin(struct inet6_ifaddr *ifp) 3930 { 3931 struct inet6_dev *idev = ifp->idev; 3932 struct net_device *dev = idev->dev; 3933 bool bump_id, notify = false; 3934 struct net *net; 3935 3936 addrconf_join_solict(dev, &ifp->addr); 3937 3938 prandom_seed((__force u32) ifp->addr.s6_addr32[3]); 3939 3940 read_lock_bh(&idev->lock); 3941 spin_lock(&ifp->lock); 3942 if (ifp->state == INET6_IFADDR_STATE_DEAD) 3943 goto out; 3944 3945 net = dev_net(dev); 3946 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) || 3947 (net->ipv6.devconf_all->accept_dad < 1 && 3948 idev->cnf.accept_dad < 1) || 3949 !(ifp->flags&IFA_F_TENTATIVE) || 3950 ifp->flags & IFA_F_NODAD) { 3951 bool send_na = false; 3952 3953 if (ifp->flags & IFA_F_TENTATIVE && 3954 !(ifp->flags & IFA_F_OPTIMISTIC)) 3955 send_na = true; 3956 bump_id = ifp->flags & IFA_F_TENTATIVE; 3957 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED); 3958 spin_unlock(&ifp->lock); 3959 read_unlock_bh(&idev->lock); 3960 3961 addrconf_dad_completed(ifp, bump_id, send_na); 3962 return; 3963 } 3964 3965 if (!(idev->if_flags & IF_READY)) { 3966 spin_unlock(&ifp->lock); 3967 read_unlock_bh(&idev->lock); 3968 /* 3969 * If the device is not ready: 3970 * - keep it tentative if it is a permanent address. 3971 * - otherwise, kill it. 3972 */ 3973 in6_ifa_hold(ifp); 3974 addrconf_dad_stop(ifp, 0); 3975 return; 3976 } 3977 3978 /* 3979 * Optimistic nodes can start receiving 3980 * Frames right away 3981 */ 3982 if (ifp->flags & IFA_F_OPTIMISTIC) { 3983 ip6_ins_rt(net, ifp->rt); 3984 if (ipv6_use_optimistic_addr(net, idev)) { 3985 /* Because optimistic nodes can use this address, 3986 * notify listeners. If DAD fails, RTM_DELADDR is sent. 3987 */ 3988 notify = true; 3989 } 3990 } 3991 3992 addrconf_dad_kick(ifp); 3993 out: 3994 spin_unlock(&ifp->lock); 3995 read_unlock_bh(&idev->lock); 3996 if (notify) 3997 ipv6_ifa_notify(RTM_NEWADDR, ifp); 3998 } 3999 4000 static void addrconf_dad_start(struct inet6_ifaddr *ifp) 4001 { 4002 bool begin_dad = false; 4003 4004 spin_lock_bh(&ifp->lock); 4005 if (ifp->state != INET6_IFADDR_STATE_DEAD) { 4006 ifp->state = INET6_IFADDR_STATE_PREDAD; 4007 begin_dad = true; 4008 } 4009 spin_unlock_bh(&ifp->lock); 4010 4011 if (begin_dad) 4012 addrconf_mod_dad_work(ifp, 0); 4013 } 4014 4015 static void addrconf_dad_work(struct work_struct *w) 4016 { 4017 struct inet6_ifaddr *ifp = container_of(to_delayed_work(w), 4018 struct inet6_ifaddr, 4019 dad_work); 4020 struct inet6_dev *idev = ifp->idev; 4021 bool bump_id, disable_ipv6 = false; 4022 struct in6_addr mcaddr; 4023 4024 enum { 4025 DAD_PROCESS, 4026 DAD_BEGIN, 4027 DAD_ABORT, 4028 } action = DAD_PROCESS; 4029 4030 rtnl_lock(); 4031 4032 spin_lock_bh(&ifp->lock); 4033 if (ifp->state == INET6_IFADDR_STATE_PREDAD) { 4034 action = DAD_BEGIN; 4035 ifp->state = INET6_IFADDR_STATE_DAD; 4036 } else if (ifp->state == INET6_IFADDR_STATE_ERRDAD) { 4037 action = DAD_ABORT; 4038 ifp->state = INET6_IFADDR_STATE_POSTDAD; 4039 4040 if ((dev_net(idev->dev)->ipv6.devconf_all->accept_dad > 1 || 4041 idev->cnf.accept_dad > 1) && 4042 !idev->cnf.disable_ipv6 && 4043 !(ifp->flags & IFA_F_STABLE_PRIVACY)) { 4044 struct in6_addr addr; 4045 4046 addr.s6_addr32[0] = htonl(0xfe800000); 4047 addr.s6_addr32[1] = 0; 4048 4049 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) && 4050 ipv6_addr_equal(&ifp->addr, &addr)) { 4051 /* DAD failed for link-local based on MAC */ 4052 idev->cnf.disable_ipv6 = 1; 4053 4054 pr_info("%s: IPv6 being disabled!\n", 4055 ifp->idev->dev->name); 4056 disable_ipv6 = true; 4057 } 4058 } 4059 } 4060 spin_unlock_bh(&ifp->lock); 4061 4062 if (action == DAD_BEGIN) { 4063 addrconf_dad_begin(ifp); 4064 goto out; 4065 } else if (action == DAD_ABORT) { 4066 in6_ifa_hold(ifp); 4067 addrconf_dad_stop(ifp, 1); 4068 if (disable_ipv6) 4069 addrconf_ifdown(idev->dev, 0); 4070 goto out; 4071 } 4072 4073 if (!ifp->dad_probes && addrconf_dad_end(ifp)) 4074 goto out; 4075 4076 write_lock_bh(&idev->lock); 4077 if (idev->dead || !(idev->if_flags & IF_READY)) { 4078 write_unlock_bh(&idev->lock); 4079 goto out; 4080 } 4081 4082 spin_lock(&ifp->lock); 4083 if (ifp->state == INET6_IFADDR_STATE_DEAD) { 4084 spin_unlock(&ifp->lock); 4085 write_unlock_bh(&idev->lock); 4086 goto out; 4087 } 4088 4089 if (ifp->dad_probes == 0) { 4090 bool send_na = false; 4091 4092 /* 4093 * DAD was successful 4094 */ 4095 4096 if (ifp->flags & IFA_F_TENTATIVE && 4097 !(ifp->flags & IFA_F_OPTIMISTIC)) 4098 send_na = true; 4099 bump_id = ifp->flags & IFA_F_TENTATIVE; 4100 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED); 4101 spin_unlock(&ifp->lock); 4102 write_unlock_bh(&idev->lock); 4103 4104 addrconf_dad_completed(ifp, bump_id, send_na); 4105 4106 goto out; 4107 } 4108 4109 ifp->dad_probes--; 4110 addrconf_mod_dad_work(ifp, 4111 max(NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME), 4112 HZ/100)); 4113 spin_unlock(&ifp->lock); 4114 write_unlock_bh(&idev->lock); 4115 4116 /* send a neighbour solicitation for our addr */ 4117 addrconf_addr_solict_mult(&ifp->addr, &mcaddr); 4118 ndisc_send_ns(ifp->idev->dev, &ifp->addr, &mcaddr, &in6addr_any, 4119 ifp->dad_nonce); 4120 out: 4121 in6_ifa_put(ifp); 4122 rtnl_unlock(); 4123 } 4124 4125 /* ifp->idev must be at least read locked */ 4126 static bool ipv6_lonely_lladdr(struct inet6_ifaddr *ifp) 4127 { 4128 struct inet6_ifaddr *ifpiter; 4129 struct inet6_dev *idev = ifp->idev; 4130 4131 list_for_each_entry_reverse(ifpiter, &idev->addr_list, if_list) { 4132 if (ifpiter->scope > IFA_LINK) 4133 break; 4134 if (ifp != ifpiter && ifpiter->scope == IFA_LINK && 4135 (ifpiter->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE| 4136 IFA_F_OPTIMISTIC|IFA_F_DADFAILED)) == 4137 IFA_F_PERMANENT) 4138 return false; 4139 } 4140 return true; 4141 } 4142 4143 static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id, 4144 bool send_na) 4145 { 4146 struct net_device *dev = ifp->idev->dev; 4147 struct in6_addr lladdr; 4148 bool send_rs, send_mld; 4149 4150 addrconf_del_dad_work(ifp); 4151 4152 /* 4153 * Configure the address for reception. Now it is valid. 4154 */ 4155 4156 ipv6_ifa_notify(RTM_NEWADDR, ifp); 4157 4158 /* If added prefix is link local and we are prepared to process 4159 router advertisements, start sending router solicitations. 4160 */ 4161 4162 read_lock_bh(&ifp->idev->lock); 4163 send_mld = ifp->scope == IFA_LINK && ipv6_lonely_lladdr(ifp); 4164 send_rs = send_mld && 4165 ipv6_accept_ra(ifp->idev) && 4166 ifp->idev->cnf.rtr_solicits != 0 && 4167 (dev->flags&IFF_LOOPBACK) == 0; 4168 read_unlock_bh(&ifp->idev->lock); 4169 4170 /* While dad is in progress mld report's source address is in6_addrany. 4171 * Resend with proper ll now. 4172 */ 4173 if (send_mld) 4174 ipv6_mc_dad_complete(ifp->idev); 4175 4176 /* send unsolicited NA if enabled */ 4177 if (send_na && 4178 (ifp->idev->cnf.ndisc_notify || 4179 dev_net(dev)->ipv6.devconf_all->ndisc_notify)) { 4180 ndisc_send_na(dev, &in6addr_linklocal_allnodes, &ifp->addr, 4181 /*router=*/ !!ifp->idev->cnf.forwarding, 4182 /*solicited=*/ false, /*override=*/ true, 4183 /*inc_opt=*/ true); 4184 } 4185 4186 if (send_rs) { 4187 /* 4188 * If a host as already performed a random delay 4189 * [...] as part of DAD [...] there is no need 4190 * to delay again before sending the first RS 4191 */ 4192 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE)) 4193 return; 4194 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters); 4195 4196 write_lock_bh(&ifp->idev->lock); 4197 spin_lock(&ifp->lock); 4198 ifp->idev->rs_interval = rfc3315_s14_backoff_init( 4199 ifp->idev->cnf.rtr_solicit_interval); 4200 ifp->idev->rs_probes = 1; 4201 ifp->idev->if_flags |= IF_RS_SENT; 4202 addrconf_mod_rs_timer(ifp->idev, ifp->idev->rs_interval); 4203 spin_unlock(&ifp->lock); 4204 write_unlock_bh(&ifp->idev->lock); 4205 } 4206 4207 if (bump_id) 4208 rt_genid_bump_ipv6(dev_net(dev)); 4209 4210 /* Make sure that a new temporary address will be created 4211 * before this temporary address becomes deprecated. 4212 */ 4213 if (ifp->flags & IFA_F_TEMPORARY) 4214 addrconf_verify_rtnl(); 4215 } 4216 4217 static void addrconf_dad_run(struct inet6_dev *idev, bool restart) 4218 { 4219 struct inet6_ifaddr *ifp; 4220 4221 read_lock_bh(&idev->lock); 4222 list_for_each_entry(ifp, &idev->addr_list, if_list) { 4223 spin_lock(&ifp->lock); 4224 if ((ifp->flags & IFA_F_TENTATIVE && 4225 ifp->state == INET6_IFADDR_STATE_DAD) || restart) { 4226 if (restart) 4227 ifp->state = INET6_IFADDR_STATE_PREDAD; 4228 addrconf_dad_kick(ifp); 4229 } 4230 spin_unlock(&ifp->lock); 4231 } 4232 read_unlock_bh(&idev->lock); 4233 } 4234 4235 #ifdef CONFIG_PROC_FS 4236 struct if6_iter_state { 4237 struct seq_net_private p; 4238 int bucket; 4239 int offset; 4240 }; 4241 4242 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos) 4243 { 4244 struct if6_iter_state *state = seq->private; 4245 struct net *net = seq_file_net(seq); 4246 struct inet6_ifaddr *ifa = NULL; 4247 int p = 0; 4248 4249 /* initial bucket if pos is 0 */ 4250 if (pos == 0) { 4251 state->bucket = 0; 4252 state->offset = 0; 4253 } 4254 4255 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) { 4256 hlist_for_each_entry_rcu(ifa, &inet6_addr_lst[state->bucket], 4257 addr_lst) { 4258 if (!net_eq(dev_net(ifa->idev->dev), net)) 4259 continue; 4260 /* sync with offset */ 4261 if (p < state->offset) { 4262 p++; 4263 continue; 4264 } 4265 return ifa; 4266 } 4267 4268 /* prepare for next bucket */ 4269 state->offset = 0; 4270 p = 0; 4271 } 4272 return NULL; 4273 } 4274 4275 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, 4276 struct inet6_ifaddr *ifa) 4277 { 4278 struct if6_iter_state *state = seq->private; 4279 struct net *net = seq_file_net(seq); 4280 4281 hlist_for_each_entry_continue_rcu(ifa, addr_lst) { 4282 if (!net_eq(dev_net(ifa->idev->dev), net)) 4283 continue; 4284 state->offset++; 4285 return ifa; 4286 } 4287 4288 state->offset = 0; 4289 while (++state->bucket < IN6_ADDR_HSIZE) { 4290 hlist_for_each_entry_rcu(ifa, 4291 &inet6_addr_lst[state->bucket], addr_lst) { 4292 if (!net_eq(dev_net(ifa->idev->dev), net)) 4293 continue; 4294 return ifa; 4295 } 4296 } 4297 4298 return NULL; 4299 } 4300 4301 static void *if6_seq_start(struct seq_file *seq, loff_t *pos) 4302 __acquires(rcu) 4303 { 4304 rcu_read_lock(); 4305 return if6_get_first(seq, *pos); 4306 } 4307 4308 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos) 4309 { 4310 struct inet6_ifaddr *ifa; 4311 4312 ifa = if6_get_next(seq, v); 4313 ++*pos; 4314 return ifa; 4315 } 4316 4317 static void if6_seq_stop(struct seq_file *seq, void *v) 4318 __releases(rcu) 4319 { 4320 rcu_read_unlock(); 4321 } 4322 4323 static int if6_seq_show(struct seq_file *seq, void *v) 4324 { 4325 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v; 4326 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n", 4327 &ifp->addr, 4328 ifp->idev->dev->ifindex, 4329 ifp->prefix_len, 4330 ifp->scope, 4331 (u8) ifp->flags, 4332 ifp->idev->dev->name); 4333 return 0; 4334 } 4335 4336 static const struct seq_operations if6_seq_ops = { 4337 .start = if6_seq_start, 4338 .next = if6_seq_next, 4339 .show = if6_seq_show, 4340 .stop = if6_seq_stop, 4341 }; 4342 4343 static int __net_init if6_proc_net_init(struct net *net) 4344 { 4345 if (!proc_create_net("if_inet6", 0444, net->proc_net, &if6_seq_ops, 4346 sizeof(struct if6_iter_state))) 4347 return -ENOMEM; 4348 return 0; 4349 } 4350 4351 static void __net_exit if6_proc_net_exit(struct net *net) 4352 { 4353 remove_proc_entry("if_inet6", net->proc_net); 4354 } 4355 4356 static struct pernet_operations if6_proc_net_ops = { 4357 .init = if6_proc_net_init, 4358 .exit = if6_proc_net_exit, 4359 }; 4360 4361 int __init if6_proc_init(void) 4362 { 4363 return register_pernet_subsys(&if6_proc_net_ops); 4364 } 4365 4366 void if6_proc_exit(void) 4367 { 4368 unregister_pernet_subsys(&if6_proc_net_ops); 4369 } 4370 #endif /* CONFIG_PROC_FS */ 4371 4372 #if IS_ENABLED(CONFIG_IPV6_MIP6) 4373 /* Check if address is a home address configured on any interface. */ 4374 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr) 4375 { 4376 unsigned int hash = inet6_addr_hash(net, addr); 4377 struct inet6_ifaddr *ifp = NULL; 4378 int ret = 0; 4379 4380 rcu_read_lock(); 4381 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) { 4382 if (!net_eq(dev_net(ifp->idev->dev), net)) 4383 continue; 4384 if (ipv6_addr_equal(&ifp->addr, addr) && 4385 (ifp->flags & IFA_F_HOMEADDRESS)) { 4386 ret = 1; 4387 break; 4388 } 4389 } 4390 rcu_read_unlock(); 4391 return ret; 4392 } 4393 #endif 4394 4395 /* RFC6554 has some algorithm to avoid loops in segment routing by 4396 * checking if the segments contains any of a local interface address. 4397 * 4398 * Quote: 4399 * 4400 * To detect loops in the SRH, a router MUST determine if the SRH 4401 * includes multiple addresses assigned to any interface on that router. 4402 * If such addresses appear more than once and are separated by at least 4403 * one address not assigned to that router. 4404 */ 4405 int ipv6_chk_rpl_srh_loop(struct net *net, const struct in6_addr *segs, 4406 unsigned char nsegs) 4407 { 4408 const struct in6_addr *addr; 4409 int i, ret = 0, found = 0; 4410 struct inet6_ifaddr *ifp; 4411 bool separated = false; 4412 unsigned int hash; 4413 bool hash_found; 4414 4415 rcu_read_lock(); 4416 for (i = 0; i < nsegs; i++) { 4417 addr = &segs[i]; 4418 hash = inet6_addr_hash(net, addr); 4419 4420 hash_found = false; 4421 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) { 4422 if (!net_eq(dev_net(ifp->idev->dev), net)) 4423 continue; 4424 4425 if (ipv6_addr_equal(&ifp->addr, addr)) { 4426 hash_found = true; 4427 break; 4428 } 4429 } 4430 4431 if (hash_found) { 4432 if (found > 1 && separated) { 4433 ret = 1; 4434 break; 4435 } 4436 4437 separated = false; 4438 found++; 4439 } else { 4440 separated = true; 4441 } 4442 } 4443 rcu_read_unlock(); 4444 4445 return ret; 4446 } 4447 4448 /* 4449 * Periodic address status verification 4450 */ 4451 4452 static void addrconf_verify_rtnl(void) 4453 { 4454 unsigned long now, next, next_sec, next_sched; 4455 struct inet6_ifaddr *ifp; 4456 int i; 4457 4458 ASSERT_RTNL(); 4459 4460 rcu_read_lock_bh(); 4461 now = jiffies; 4462 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY); 4463 4464 cancel_delayed_work(&addr_chk_work); 4465 4466 for (i = 0; i < IN6_ADDR_HSIZE; i++) { 4467 restart: 4468 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[i], addr_lst) { 4469 unsigned long age; 4470 4471 /* When setting preferred_lft to a value not zero or 4472 * infinity, while valid_lft is infinity 4473 * IFA_F_PERMANENT has a non-infinity life time. 4474 */ 4475 if ((ifp->flags & IFA_F_PERMANENT) && 4476 (ifp->prefered_lft == INFINITY_LIFE_TIME)) 4477 continue; 4478 4479 spin_lock(&ifp->lock); 4480 /* We try to batch several events at once. */ 4481 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ; 4482 4483 if (ifp->valid_lft != INFINITY_LIFE_TIME && 4484 age >= ifp->valid_lft) { 4485 spin_unlock(&ifp->lock); 4486 in6_ifa_hold(ifp); 4487 ipv6_del_addr(ifp); 4488 goto restart; 4489 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) { 4490 spin_unlock(&ifp->lock); 4491 continue; 4492 } else if (age >= ifp->prefered_lft) { 4493 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */ 4494 int deprecate = 0; 4495 4496 if (!(ifp->flags&IFA_F_DEPRECATED)) { 4497 deprecate = 1; 4498 ifp->flags |= IFA_F_DEPRECATED; 4499 } 4500 4501 if ((ifp->valid_lft != INFINITY_LIFE_TIME) && 4502 (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))) 4503 next = ifp->tstamp + ifp->valid_lft * HZ; 4504 4505 spin_unlock(&ifp->lock); 4506 4507 if (deprecate) { 4508 in6_ifa_hold(ifp); 4509 4510 ipv6_ifa_notify(0, ifp); 4511 in6_ifa_put(ifp); 4512 goto restart; 4513 } 4514 } else if ((ifp->flags&IFA_F_TEMPORARY) && 4515 !(ifp->flags&IFA_F_TENTATIVE)) { 4516 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry * 4517 ifp->idev->cnf.dad_transmits * 4518 max(NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME), HZ/100) / HZ; 4519 4520 if (age >= ifp->prefered_lft - regen_advance) { 4521 struct inet6_ifaddr *ifpub = ifp->ifpub; 4522 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 4523 next = ifp->tstamp + ifp->prefered_lft * HZ; 4524 if (!ifp->regen_count && ifpub) { 4525 ifp->regen_count++; 4526 in6_ifa_hold(ifp); 4527 in6_ifa_hold(ifpub); 4528 spin_unlock(&ifp->lock); 4529 4530 spin_lock(&ifpub->lock); 4531 ifpub->regen_count = 0; 4532 spin_unlock(&ifpub->lock); 4533 rcu_read_unlock_bh(); 4534 ipv6_create_tempaddr(ifpub, ifp, true); 4535 in6_ifa_put(ifpub); 4536 in6_ifa_put(ifp); 4537 rcu_read_lock_bh(); 4538 goto restart; 4539 } 4540 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next)) 4541 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ; 4542 spin_unlock(&ifp->lock); 4543 } else { 4544 /* ifp->prefered_lft <= ifp->valid_lft */ 4545 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 4546 next = ifp->tstamp + ifp->prefered_lft * HZ; 4547 spin_unlock(&ifp->lock); 4548 } 4549 } 4550 } 4551 4552 next_sec = round_jiffies_up(next); 4553 next_sched = next; 4554 4555 /* If rounded timeout is accurate enough, accept it. */ 4556 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ)) 4557 next_sched = next_sec; 4558 4559 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */ 4560 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX)) 4561 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX; 4562 4563 pr_debug("now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n", 4564 now, next, next_sec, next_sched); 4565 mod_delayed_work(addrconf_wq, &addr_chk_work, next_sched - now); 4566 rcu_read_unlock_bh(); 4567 } 4568 4569 static void addrconf_verify_work(struct work_struct *w) 4570 { 4571 rtnl_lock(); 4572 addrconf_verify_rtnl(); 4573 rtnl_unlock(); 4574 } 4575 4576 static void addrconf_verify(void) 4577 { 4578 mod_delayed_work(addrconf_wq, &addr_chk_work, 0); 4579 } 4580 4581 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local, 4582 struct in6_addr **peer_pfx) 4583 { 4584 struct in6_addr *pfx = NULL; 4585 4586 *peer_pfx = NULL; 4587 4588 if (addr) 4589 pfx = nla_data(addr); 4590 4591 if (local) { 4592 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx))) 4593 *peer_pfx = pfx; 4594 pfx = nla_data(local); 4595 } 4596 4597 return pfx; 4598 } 4599 4600 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = { 4601 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) }, 4602 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) }, 4603 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) }, 4604 [IFA_FLAGS] = { .len = sizeof(u32) }, 4605 [IFA_RT_PRIORITY] = { .len = sizeof(u32) }, 4606 [IFA_TARGET_NETNSID] = { .type = NLA_S32 }, 4607 }; 4608 4609 static int 4610 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, 4611 struct netlink_ext_ack *extack) 4612 { 4613 struct net *net = sock_net(skb->sk); 4614 struct ifaddrmsg *ifm; 4615 struct nlattr *tb[IFA_MAX+1]; 4616 struct in6_addr *pfx, *peer_pfx; 4617 u32 ifa_flags; 4618 int err; 4619 4620 err = nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX, 4621 ifa_ipv6_policy, extack); 4622 if (err < 0) 4623 return err; 4624 4625 ifm = nlmsg_data(nlh); 4626 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx); 4627 if (!pfx) 4628 return -EINVAL; 4629 4630 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags; 4631 4632 /* We ignore other flags so far. */ 4633 ifa_flags &= IFA_F_MANAGETEMPADDR; 4634 4635 return inet6_addr_del(net, ifm->ifa_index, ifa_flags, pfx, 4636 ifm->ifa_prefixlen); 4637 } 4638 4639 static int modify_prefix_route(struct inet6_ifaddr *ifp, 4640 unsigned long expires, u32 flags, 4641 bool modify_peer) 4642 { 4643 struct fib6_info *f6i; 4644 u32 prio; 4645 4646 f6i = addrconf_get_prefix_route(modify_peer ? &ifp->peer_addr : &ifp->addr, 4647 ifp->prefix_len, 4648 ifp->idev->dev, 0, RTF_DEFAULT, true); 4649 if (!f6i) 4650 return -ENOENT; 4651 4652 prio = ifp->rt_priority ? : IP6_RT_PRIO_ADDRCONF; 4653 if (f6i->fib6_metric != prio) { 4654 /* delete old one */ 4655 ip6_del_rt(dev_net(ifp->idev->dev), f6i, false); 4656 4657 /* add new one */ 4658 addrconf_prefix_route(modify_peer ? &ifp->peer_addr : &ifp->addr, 4659 ifp->prefix_len, 4660 ifp->rt_priority, ifp->idev->dev, 4661 expires, flags, GFP_KERNEL); 4662 } else { 4663 if (!expires) 4664 fib6_clean_expires(f6i); 4665 else 4666 fib6_set_expires(f6i, expires); 4667 4668 fib6_info_release(f6i); 4669 } 4670 4671 return 0; 4672 } 4673 4674 static int inet6_addr_modify(struct inet6_ifaddr *ifp, struct ifa6_config *cfg) 4675 { 4676 u32 flags; 4677 clock_t expires; 4678 unsigned long timeout; 4679 bool was_managetempaddr; 4680 bool had_prefixroute; 4681 bool new_peer = false; 4682 4683 ASSERT_RTNL(); 4684 4685 if (!cfg->valid_lft || cfg->preferred_lft > cfg->valid_lft) 4686 return -EINVAL; 4687 4688 if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR && 4689 (ifp->flags & IFA_F_TEMPORARY || ifp->prefix_len != 64)) 4690 return -EINVAL; 4691 4692 if (!(ifp->flags & IFA_F_TENTATIVE) || ifp->flags & IFA_F_DADFAILED) 4693 cfg->ifa_flags &= ~IFA_F_OPTIMISTIC; 4694 4695 timeout = addrconf_timeout_fixup(cfg->valid_lft, HZ); 4696 if (addrconf_finite_timeout(timeout)) { 4697 expires = jiffies_to_clock_t(timeout * HZ); 4698 cfg->valid_lft = timeout; 4699 flags = RTF_EXPIRES; 4700 } else { 4701 expires = 0; 4702 flags = 0; 4703 cfg->ifa_flags |= IFA_F_PERMANENT; 4704 } 4705 4706 timeout = addrconf_timeout_fixup(cfg->preferred_lft, HZ); 4707 if (addrconf_finite_timeout(timeout)) { 4708 if (timeout == 0) 4709 cfg->ifa_flags |= IFA_F_DEPRECATED; 4710 cfg->preferred_lft = timeout; 4711 } 4712 4713 if (cfg->peer_pfx && 4714 memcmp(&ifp->peer_addr, cfg->peer_pfx, sizeof(struct in6_addr))) { 4715 if (!ipv6_addr_any(&ifp->peer_addr)) 4716 cleanup_prefix_route(ifp, expires, true, true); 4717 new_peer = true; 4718 } 4719 4720 spin_lock_bh(&ifp->lock); 4721 was_managetempaddr = ifp->flags & IFA_F_MANAGETEMPADDR; 4722 had_prefixroute = ifp->flags & IFA_F_PERMANENT && 4723 !(ifp->flags & IFA_F_NOPREFIXROUTE); 4724 ifp->flags &= ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | 4725 IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR | 4726 IFA_F_NOPREFIXROUTE); 4727 ifp->flags |= cfg->ifa_flags; 4728 ifp->tstamp = jiffies; 4729 ifp->valid_lft = cfg->valid_lft; 4730 ifp->prefered_lft = cfg->preferred_lft; 4731 4732 if (cfg->rt_priority && cfg->rt_priority != ifp->rt_priority) 4733 ifp->rt_priority = cfg->rt_priority; 4734 4735 if (new_peer) 4736 ifp->peer_addr = *cfg->peer_pfx; 4737 4738 spin_unlock_bh(&ifp->lock); 4739 if (!(ifp->flags&IFA_F_TENTATIVE)) 4740 ipv6_ifa_notify(0, ifp); 4741 4742 if (!(cfg->ifa_flags & IFA_F_NOPREFIXROUTE)) { 4743 int rc = -ENOENT; 4744 4745 if (had_prefixroute) 4746 rc = modify_prefix_route(ifp, expires, flags, false); 4747 4748 /* prefix route could have been deleted; if so restore it */ 4749 if (rc == -ENOENT) { 4750 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, 4751 ifp->rt_priority, ifp->idev->dev, 4752 expires, flags, GFP_KERNEL); 4753 } 4754 4755 if (had_prefixroute && !ipv6_addr_any(&ifp->peer_addr)) 4756 rc = modify_prefix_route(ifp, expires, flags, true); 4757 4758 if (rc == -ENOENT && !ipv6_addr_any(&ifp->peer_addr)) { 4759 addrconf_prefix_route(&ifp->peer_addr, ifp->prefix_len, 4760 ifp->rt_priority, ifp->idev->dev, 4761 expires, flags, GFP_KERNEL); 4762 } 4763 } else if (had_prefixroute) { 4764 enum cleanup_prefix_rt_t action; 4765 unsigned long rt_expires; 4766 4767 write_lock_bh(&ifp->idev->lock); 4768 action = check_cleanup_prefix_route(ifp, &rt_expires); 4769 write_unlock_bh(&ifp->idev->lock); 4770 4771 if (action != CLEANUP_PREFIX_RT_NOP) { 4772 cleanup_prefix_route(ifp, rt_expires, 4773 action == CLEANUP_PREFIX_RT_DEL, false); 4774 } 4775 } 4776 4777 if (was_managetempaddr || ifp->flags & IFA_F_MANAGETEMPADDR) { 4778 if (was_managetempaddr && 4779 !(ifp->flags & IFA_F_MANAGETEMPADDR)) { 4780 cfg->valid_lft = 0; 4781 cfg->preferred_lft = 0; 4782 } 4783 manage_tempaddrs(ifp->idev, ifp, cfg->valid_lft, 4784 cfg->preferred_lft, !was_managetempaddr, 4785 jiffies); 4786 } 4787 4788 addrconf_verify_rtnl(); 4789 4790 return 0; 4791 } 4792 4793 static int 4794 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, 4795 struct netlink_ext_ack *extack) 4796 { 4797 struct net *net = sock_net(skb->sk); 4798 struct ifaddrmsg *ifm; 4799 struct nlattr *tb[IFA_MAX+1]; 4800 struct in6_addr *peer_pfx; 4801 struct inet6_ifaddr *ifa; 4802 struct net_device *dev; 4803 struct inet6_dev *idev; 4804 struct ifa6_config cfg; 4805 int err; 4806 4807 err = nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX, 4808 ifa_ipv6_policy, extack); 4809 if (err < 0) 4810 return err; 4811 4812 memset(&cfg, 0, sizeof(cfg)); 4813 4814 ifm = nlmsg_data(nlh); 4815 cfg.pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx); 4816 if (!cfg.pfx) 4817 return -EINVAL; 4818 4819 cfg.peer_pfx = peer_pfx; 4820 cfg.plen = ifm->ifa_prefixlen; 4821 if (tb[IFA_RT_PRIORITY]) 4822 cfg.rt_priority = nla_get_u32(tb[IFA_RT_PRIORITY]); 4823 4824 cfg.valid_lft = INFINITY_LIFE_TIME; 4825 cfg.preferred_lft = INFINITY_LIFE_TIME; 4826 4827 if (tb[IFA_CACHEINFO]) { 4828 struct ifa_cacheinfo *ci; 4829 4830 ci = nla_data(tb[IFA_CACHEINFO]); 4831 cfg.valid_lft = ci->ifa_valid; 4832 cfg.preferred_lft = ci->ifa_prefered; 4833 } 4834 4835 dev = __dev_get_by_index(net, ifm->ifa_index); 4836 if (!dev) 4837 return -ENODEV; 4838 4839 if (tb[IFA_FLAGS]) 4840 cfg.ifa_flags = nla_get_u32(tb[IFA_FLAGS]); 4841 else 4842 cfg.ifa_flags = ifm->ifa_flags; 4843 4844 /* We ignore other flags so far. */ 4845 cfg.ifa_flags &= IFA_F_NODAD | IFA_F_HOMEADDRESS | 4846 IFA_F_MANAGETEMPADDR | IFA_F_NOPREFIXROUTE | 4847 IFA_F_MCAUTOJOIN | IFA_F_OPTIMISTIC; 4848 4849 idev = ipv6_find_idev(dev); 4850 if (IS_ERR(idev)) 4851 return PTR_ERR(idev); 4852 4853 if (!ipv6_allow_optimistic_dad(net, idev)) 4854 cfg.ifa_flags &= ~IFA_F_OPTIMISTIC; 4855 4856 if (cfg.ifa_flags & IFA_F_NODAD && 4857 cfg.ifa_flags & IFA_F_OPTIMISTIC) { 4858 NL_SET_ERR_MSG(extack, "IFA_F_NODAD and IFA_F_OPTIMISTIC are mutually exclusive"); 4859 return -EINVAL; 4860 } 4861 4862 ifa = ipv6_get_ifaddr(net, cfg.pfx, dev, 1); 4863 if (!ifa) { 4864 /* 4865 * It would be best to check for !NLM_F_CREATE here but 4866 * userspace already relies on not having to provide this. 4867 */ 4868 return inet6_addr_add(net, ifm->ifa_index, &cfg, extack); 4869 } 4870 4871 if (nlh->nlmsg_flags & NLM_F_EXCL || 4872 !(nlh->nlmsg_flags & NLM_F_REPLACE)) 4873 err = -EEXIST; 4874 else 4875 err = inet6_addr_modify(ifa, &cfg); 4876 4877 in6_ifa_put(ifa); 4878 4879 return err; 4880 } 4881 4882 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u32 flags, 4883 u8 scope, int ifindex) 4884 { 4885 struct ifaddrmsg *ifm; 4886 4887 ifm = nlmsg_data(nlh); 4888 ifm->ifa_family = AF_INET6; 4889 ifm->ifa_prefixlen = prefixlen; 4890 ifm->ifa_flags = flags; 4891 ifm->ifa_scope = scope; 4892 ifm->ifa_index = ifindex; 4893 } 4894 4895 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp, 4896 unsigned long tstamp, u32 preferred, u32 valid) 4897 { 4898 struct ifa_cacheinfo ci; 4899 4900 ci.cstamp = cstamp_delta(cstamp); 4901 ci.tstamp = cstamp_delta(tstamp); 4902 ci.ifa_prefered = preferred; 4903 ci.ifa_valid = valid; 4904 4905 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci); 4906 } 4907 4908 static inline int rt_scope(int ifa_scope) 4909 { 4910 if (ifa_scope & IFA_HOST) 4911 return RT_SCOPE_HOST; 4912 else if (ifa_scope & IFA_LINK) 4913 return RT_SCOPE_LINK; 4914 else if (ifa_scope & IFA_SITE) 4915 return RT_SCOPE_SITE; 4916 else 4917 return RT_SCOPE_UNIVERSE; 4918 } 4919 4920 static inline int inet6_ifaddr_msgsize(void) 4921 { 4922 return NLMSG_ALIGN(sizeof(struct ifaddrmsg)) 4923 + nla_total_size(16) /* IFA_LOCAL */ 4924 + nla_total_size(16) /* IFA_ADDRESS */ 4925 + nla_total_size(sizeof(struct ifa_cacheinfo)) 4926 + nla_total_size(4) /* IFA_FLAGS */ 4927 + nla_total_size(4) /* IFA_RT_PRIORITY */; 4928 } 4929 4930 enum addr_type_t { 4931 UNICAST_ADDR, 4932 MULTICAST_ADDR, 4933 ANYCAST_ADDR, 4934 }; 4935 4936 struct inet6_fill_args { 4937 u32 portid; 4938 u32 seq; 4939 int event; 4940 unsigned int flags; 4941 int netnsid; 4942 int ifindex; 4943 enum addr_type_t type; 4944 }; 4945 4946 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa, 4947 struct inet6_fill_args *args) 4948 { 4949 struct nlmsghdr *nlh; 4950 u32 preferred, valid; 4951 4952 nlh = nlmsg_put(skb, args->portid, args->seq, args->event, 4953 sizeof(struct ifaddrmsg), args->flags); 4954 if (!nlh) 4955 return -EMSGSIZE; 4956 4957 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope), 4958 ifa->idev->dev->ifindex); 4959 4960 if (args->netnsid >= 0 && 4961 nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid)) 4962 goto error; 4963 4964 if (!((ifa->flags&IFA_F_PERMANENT) && 4965 (ifa->prefered_lft == INFINITY_LIFE_TIME))) { 4966 preferred = ifa->prefered_lft; 4967 valid = ifa->valid_lft; 4968 if (preferred != INFINITY_LIFE_TIME) { 4969 long tval = (jiffies - ifa->tstamp)/HZ; 4970 if (preferred > tval) 4971 preferred -= tval; 4972 else 4973 preferred = 0; 4974 if (valid != INFINITY_LIFE_TIME) { 4975 if (valid > tval) 4976 valid -= tval; 4977 else 4978 valid = 0; 4979 } 4980 } 4981 } else { 4982 preferred = INFINITY_LIFE_TIME; 4983 valid = INFINITY_LIFE_TIME; 4984 } 4985 4986 if (!ipv6_addr_any(&ifa->peer_addr)) { 4987 if (nla_put_in6_addr(skb, IFA_LOCAL, &ifa->addr) < 0 || 4988 nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->peer_addr) < 0) 4989 goto error; 4990 } else 4991 if (nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->addr) < 0) 4992 goto error; 4993 4994 if (ifa->rt_priority && 4995 nla_put_u32(skb, IFA_RT_PRIORITY, ifa->rt_priority)) 4996 goto error; 4997 4998 if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) 4999 goto error; 5000 5001 if (nla_put_u32(skb, IFA_FLAGS, ifa->flags) < 0) 5002 goto error; 5003 5004 nlmsg_end(skb, nlh); 5005 return 0; 5006 5007 error: 5008 nlmsg_cancel(skb, nlh); 5009 return -EMSGSIZE; 5010 } 5011 5012 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca, 5013 struct inet6_fill_args *args) 5014 { 5015 struct nlmsghdr *nlh; 5016 u8 scope = RT_SCOPE_UNIVERSE; 5017 int ifindex = ifmca->idev->dev->ifindex; 5018 5019 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE) 5020 scope = RT_SCOPE_SITE; 5021 5022 nlh = nlmsg_put(skb, args->portid, args->seq, args->event, 5023 sizeof(struct ifaddrmsg), args->flags); 5024 if (!nlh) 5025 return -EMSGSIZE; 5026 5027 if (args->netnsid >= 0 && 5028 nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid)) 5029 return -EMSGSIZE; 5030 5031 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 5032 if (nla_put_in6_addr(skb, IFA_MULTICAST, &ifmca->mca_addr) < 0 || 5033 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp, 5034 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 5035 nlmsg_cancel(skb, nlh); 5036 return -EMSGSIZE; 5037 } 5038 5039 nlmsg_end(skb, nlh); 5040 return 0; 5041 } 5042 5043 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca, 5044 struct inet6_fill_args *args) 5045 { 5046 struct net_device *dev = fib6_info_nh_dev(ifaca->aca_rt); 5047 int ifindex = dev ? dev->ifindex : 1; 5048 struct nlmsghdr *nlh; 5049 u8 scope = RT_SCOPE_UNIVERSE; 5050 5051 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE) 5052 scope = RT_SCOPE_SITE; 5053 5054 nlh = nlmsg_put(skb, args->portid, args->seq, args->event, 5055 sizeof(struct ifaddrmsg), args->flags); 5056 if (!nlh) 5057 return -EMSGSIZE; 5058 5059 if (args->netnsid >= 0 && 5060 nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid)) 5061 return -EMSGSIZE; 5062 5063 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 5064 if (nla_put_in6_addr(skb, IFA_ANYCAST, &ifaca->aca_addr) < 0 || 5065 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp, 5066 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 5067 nlmsg_cancel(skb, nlh); 5068 return -EMSGSIZE; 5069 } 5070 5071 nlmsg_end(skb, nlh); 5072 return 0; 5073 } 5074 5075 /* called with rcu_read_lock() */ 5076 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb, 5077 struct netlink_callback *cb, int s_ip_idx, 5078 struct inet6_fill_args *fillargs) 5079 { 5080 struct ifmcaddr6 *ifmca; 5081 struct ifacaddr6 *ifaca; 5082 int ip_idx = 0; 5083 int err = 1; 5084 5085 read_lock_bh(&idev->lock); 5086 switch (fillargs->type) { 5087 case UNICAST_ADDR: { 5088 struct inet6_ifaddr *ifa; 5089 fillargs->event = RTM_NEWADDR; 5090 5091 /* unicast address incl. temp addr */ 5092 list_for_each_entry(ifa, &idev->addr_list, if_list) { 5093 if (ip_idx < s_ip_idx) 5094 goto next; 5095 err = inet6_fill_ifaddr(skb, ifa, fillargs); 5096 if (err < 0) 5097 break; 5098 nl_dump_check_consistent(cb, nlmsg_hdr(skb)); 5099 next: 5100 ip_idx++; 5101 } 5102 break; 5103 } 5104 case MULTICAST_ADDR: 5105 fillargs->event = RTM_GETMULTICAST; 5106 5107 /* multicast address */ 5108 for (ifmca = idev->mc_list; ifmca; 5109 ifmca = ifmca->next, ip_idx++) { 5110 if (ip_idx < s_ip_idx) 5111 continue; 5112 err = inet6_fill_ifmcaddr(skb, ifmca, fillargs); 5113 if (err < 0) 5114 break; 5115 } 5116 break; 5117 case ANYCAST_ADDR: 5118 fillargs->event = RTM_GETANYCAST; 5119 /* anycast address */ 5120 for (ifaca = idev->ac_list; ifaca; 5121 ifaca = ifaca->aca_next, ip_idx++) { 5122 if (ip_idx < s_ip_idx) 5123 continue; 5124 err = inet6_fill_ifacaddr(skb, ifaca, fillargs); 5125 if (err < 0) 5126 break; 5127 } 5128 break; 5129 default: 5130 break; 5131 } 5132 read_unlock_bh(&idev->lock); 5133 cb->args[2] = ip_idx; 5134 return err; 5135 } 5136 5137 static int inet6_valid_dump_ifaddr_req(const struct nlmsghdr *nlh, 5138 struct inet6_fill_args *fillargs, 5139 struct net **tgt_net, struct sock *sk, 5140 struct netlink_callback *cb) 5141 { 5142 struct netlink_ext_ack *extack = cb->extack; 5143 struct nlattr *tb[IFA_MAX+1]; 5144 struct ifaddrmsg *ifm; 5145 int err, i; 5146 5147 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) { 5148 NL_SET_ERR_MSG_MOD(extack, "Invalid header for address dump request"); 5149 return -EINVAL; 5150 } 5151 5152 ifm = nlmsg_data(nlh); 5153 if (ifm->ifa_prefixlen || ifm->ifa_flags || ifm->ifa_scope) { 5154 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for address dump request"); 5155 return -EINVAL; 5156 } 5157 5158 fillargs->ifindex = ifm->ifa_index; 5159 if (fillargs->ifindex) { 5160 cb->answer_flags |= NLM_F_DUMP_FILTERED; 5161 fillargs->flags |= NLM_F_DUMP_FILTERED; 5162 } 5163 5164 err = nlmsg_parse_deprecated_strict(nlh, sizeof(*ifm), tb, IFA_MAX, 5165 ifa_ipv6_policy, extack); 5166 if (err < 0) 5167 return err; 5168 5169 for (i = 0; i <= IFA_MAX; ++i) { 5170 if (!tb[i]) 5171 continue; 5172 5173 if (i == IFA_TARGET_NETNSID) { 5174 struct net *net; 5175 5176 fillargs->netnsid = nla_get_s32(tb[i]); 5177 net = rtnl_get_net_ns_capable(sk, fillargs->netnsid); 5178 if (IS_ERR(net)) { 5179 fillargs->netnsid = -1; 5180 NL_SET_ERR_MSG_MOD(extack, "Invalid target network namespace id"); 5181 return PTR_ERR(net); 5182 } 5183 *tgt_net = net; 5184 } else { 5185 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in dump request"); 5186 return -EINVAL; 5187 } 5188 } 5189 5190 return 0; 5191 } 5192 5193 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb, 5194 enum addr_type_t type) 5195 { 5196 const struct nlmsghdr *nlh = cb->nlh; 5197 struct inet6_fill_args fillargs = { 5198 .portid = NETLINK_CB(cb->skb).portid, 5199 .seq = cb->nlh->nlmsg_seq, 5200 .flags = NLM_F_MULTI, 5201 .netnsid = -1, 5202 .type = type, 5203 }; 5204 struct net *net = sock_net(skb->sk); 5205 struct net *tgt_net = net; 5206 int idx, s_idx, s_ip_idx; 5207 int h, s_h; 5208 struct net_device *dev; 5209 struct inet6_dev *idev; 5210 struct hlist_head *head; 5211 int err = 0; 5212 5213 s_h = cb->args[0]; 5214 s_idx = idx = cb->args[1]; 5215 s_ip_idx = cb->args[2]; 5216 5217 if (cb->strict_check) { 5218 err = inet6_valid_dump_ifaddr_req(nlh, &fillargs, &tgt_net, 5219 skb->sk, cb); 5220 if (err < 0) 5221 goto put_tgt_net; 5222 5223 err = 0; 5224 if (fillargs.ifindex) { 5225 dev = __dev_get_by_index(tgt_net, fillargs.ifindex); 5226 if (!dev) { 5227 err = -ENODEV; 5228 goto put_tgt_net; 5229 } 5230 idev = __in6_dev_get(dev); 5231 if (idev) { 5232 err = in6_dump_addrs(idev, skb, cb, s_ip_idx, 5233 &fillargs); 5234 if (err > 0) 5235 err = 0; 5236 } 5237 goto put_tgt_net; 5238 } 5239 } 5240 5241 rcu_read_lock(); 5242 cb->seq = atomic_read(&tgt_net->ipv6.dev_addr_genid) ^ tgt_net->dev_base_seq; 5243 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 5244 idx = 0; 5245 head = &tgt_net->dev_index_head[h]; 5246 hlist_for_each_entry_rcu(dev, head, index_hlist) { 5247 if (idx < s_idx) 5248 goto cont; 5249 if (h > s_h || idx > s_idx) 5250 s_ip_idx = 0; 5251 idev = __in6_dev_get(dev); 5252 if (!idev) 5253 goto cont; 5254 5255 if (in6_dump_addrs(idev, skb, cb, s_ip_idx, 5256 &fillargs) < 0) 5257 goto done; 5258 cont: 5259 idx++; 5260 } 5261 } 5262 done: 5263 rcu_read_unlock(); 5264 cb->args[0] = h; 5265 cb->args[1] = idx; 5266 put_tgt_net: 5267 if (fillargs.netnsid >= 0) 5268 put_net(tgt_net); 5269 5270 return skb->len ? : err; 5271 } 5272 5273 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb) 5274 { 5275 enum addr_type_t type = UNICAST_ADDR; 5276 5277 return inet6_dump_addr(skb, cb, type); 5278 } 5279 5280 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb) 5281 { 5282 enum addr_type_t type = MULTICAST_ADDR; 5283 5284 return inet6_dump_addr(skb, cb, type); 5285 } 5286 5287 5288 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb) 5289 { 5290 enum addr_type_t type = ANYCAST_ADDR; 5291 5292 return inet6_dump_addr(skb, cb, type); 5293 } 5294 5295 static int inet6_rtm_valid_getaddr_req(struct sk_buff *skb, 5296 const struct nlmsghdr *nlh, 5297 struct nlattr **tb, 5298 struct netlink_ext_ack *extack) 5299 { 5300 struct ifaddrmsg *ifm; 5301 int i, err; 5302 5303 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) { 5304 NL_SET_ERR_MSG_MOD(extack, "Invalid header for get address request"); 5305 return -EINVAL; 5306 } 5307 5308 if (!netlink_strict_get_check(skb)) 5309 return nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX, 5310 ifa_ipv6_policy, extack); 5311 5312 ifm = nlmsg_data(nlh); 5313 if (ifm->ifa_prefixlen || ifm->ifa_flags || ifm->ifa_scope) { 5314 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for get address request"); 5315 return -EINVAL; 5316 } 5317 5318 err = nlmsg_parse_deprecated_strict(nlh, sizeof(*ifm), tb, IFA_MAX, 5319 ifa_ipv6_policy, extack); 5320 if (err) 5321 return err; 5322 5323 for (i = 0; i <= IFA_MAX; i++) { 5324 if (!tb[i]) 5325 continue; 5326 5327 switch (i) { 5328 case IFA_TARGET_NETNSID: 5329 case IFA_ADDRESS: 5330 case IFA_LOCAL: 5331 break; 5332 default: 5333 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in get address request"); 5334 return -EINVAL; 5335 } 5336 } 5337 5338 return 0; 5339 } 5340 5341 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh, 5342 struct netlink_ext_ack *extack) 5343 { 5344 struct net *net = sock_net(in_skb->sk); 5345 struct inet6_fill_args fillargs = { 5346 .portid = NETLINK_CB(in_skb).portid, 5347 .seq = nlh->nlmsg_seq, 5348 .event = RTM_NEWADDR, 5349 .flags = 0, 5350 .netnsid = -1, 5351 }; 5352 struct net *tgt_net = net; 5353 struct ifaddrmsg *ifm; 5354 struct nlattr *tb[IFA_MAX+1]; 5355 struct in6_addr *addr = NULL, *peer; 5356 struct net_device *dev = NULL; 5357 struct inet6_ifaddr *ifa; 5358 struct sk_buff *skb; 5359 int err; 5360 5361 err = inet6_rtm_valid_getaddr_req(in_skb, nlh, tb, extack); 5362 if (err < 0) 5363 return err; 5364 5365 if (tb[IFA_TARGET_NETNSID]) { 5366 fillargs.netnsid = nla_get_s32(tb[IFA_TARGET_NETNSID]); 5367 5368 tgt_net = rtnl_get_net_ns_capable(NETLINK_CB(in_skb).sk, 5369 fillargs.netnsid); 5370 if (IS_ERR(tgt_net)) 5371 return PTR_ERR(tgt_net); 5372 } 5373 5374 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer); 5375 if (!addr) 5376 return -EINVAL; 5377 5378 ifm = nlmsg_data(nlh); 5379 if (ifm->ifa_index) 5380 dev = dev_get_by_index(tgt_net, ifm->ifa_index); 5381 5382 ifa = ipv6_get_ifaddr(tgt_net, addr, dev, 1); 5383 if (!ifa) { 5384 err = -EADDRNOTAVAIL; 5385 goto errout; 5386 } 5387 5388 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL); 5389 if (!skb) { 5390 err = -ENOBUFS; 5391 goto errout_ifa; 5392 } 5393 5394 err = inet6_fill_ifaddr(skb, ifa, &fillargs); 5395 if (err < 0) { 5396 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 5397 WARN_ON(err == -EMSGSIZE); 5398 kfree_skb(skb); 5399 goto errout_ifa; 5400 } 5401 err = rtnl_unicast(skb, tgt_net, NETLINK_CB(in_skb).portid); 5402 errout_ifa: 5403 in6_ifa_put(ifa); 5404 errout: 5405 if (dev) 5406 dev_put(dev); 5407 if (fillargs.netnsid >= 0) 5408 put_net(tgt_net); 5409 5410 return err; 5411 } 5412 5413 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa) 5414 { 5415 struct sk_buff *skb; 5416 struct net *net = dev_net(ifa->idev->dev); 5417 struct inet6_fill_args fillargs = { 5418 .portid = 0, 5419 .seq = 0, 5420 .event = event, 5421 .flags = 0, 5422 .netnsid = -1, 5423 }; 5424 int err = -ENOBUFS; 5425 5426 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC); 5427 if (!skb) 5428 goto errout; 5429 5430 err = inet6_fill_ifaddr(skb, ifa, &fillargs); 5431 if (err < 0) { 5432 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 5433 WARN_ON(err == -EMSGSIZE); 5434 kfree_skb(skb); 5435 goto errout; 5436 } 5437 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC); 5438 return; 5439 errout: 5440 if (err < 0) 5441 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err); 5442 } 5443 5444 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf, 5445 __s32 *array, int bytes) 5446 { 5447 BUG_ON(bytes < (DEVCONF_MAX * 4)); 5448 5449 memset(array, 0, bytes); 5450 array[DEVCONF_FORWARDING] = cnf->forwarding; 5451 array[DEVCONF_HOPLIMIT] = cnf->hop_limit; 5452 array[DEVCONF_MTU6] = cnf->mtu6; 5453 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra; 5454 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects; 5455 array[DEVCONF_AUTOCONF] = cnf->autoconf; 5456 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits; 5457 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits; 5458 array[DEVCONF_RTR_SOLICIT_INTERVAL] = 5459 jiffies_to_msecs(cnf->rtr_solicit_interval); 5460 array[DEVCONF_RTR_SOLICIT_MAX_INTERVAL] = 5461 jiffies_to_msecs(cnf->rtr_solicit_max_interval); 5462 array[DEVCONF_RTR_SOLICIT_DELAY] = 5463 jiffies_to_msecs(cnf->rtr_solicit_delay); 5464 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version; 5465 array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] = 5466 jiffies_to_msecs(cnf->mldv1_unsolicited_report_interval); 5467 array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] = 5468 jiffies_to_msecs(cnf->mldv2_unsolicited_report_interval); 5469 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr; 5470 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft; 5471 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft; 5472 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry; 5473 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor; 5474 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses; 5475 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr; 5476 array[DEVCONF_ACCEPT_RA_MIN_HOP_LIMIT] = cnf->accept_ra_min_hop_limit; 5477 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo; 5478 #ifdef CONFIG_IPV6_ROUTER_PREF 5479 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref; 5480 array[DEVCONF_RTR_PROBE_INTERVAL] = 5481 jiffies_to_msecs(cnf->rtr_probe_interval); 5482 #ifdef CONFIG_IPV6_ROUTE_INFO 5483 array[DEVCONF_ACCEPT_RA_RT_INFO_MIN_PLEN] = cnf->accept_ra_rt_info_min_plen; 5484 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen; 5485 #endif 5486 #endif 5487 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp; 5488 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route; 5489 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 5490 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad; 5491 array[DEVCONF_USE_OPTIMISTIC] = cnf->use_optimistic; 5492 #endif 5493 #ifdef CONFIG_IPV6_MROUTE 5494 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding; 5495 #endif 5496 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6; 5497 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad; 5498 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao; 5499 array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify; 5500 array[DEVCONF_SUPPRESS_FRAG_NDISC] = cnf->suppress_frag_ndisc; 5501 array[DEVCONF_ACCEPT_RA_FROM_LOCAL] = cnf->accept_ra_from_local; 5502 array[DEVCONF_ACCEPT_RA_MTU] = cnf->accept_ra_mtu; 5503 array[DEVCONF_IGNORE_ROUTES_WITH_LINKDOWN] = cnf->ignore_routes_with_linkdown; 5504 /* we omit DEVCONF_STABLE_SECRET for now */ 5505 array[DEVCONF_USE_OIF_ADDRS_ONLY] = cnf->use_oif_addrs_only; 5506 array[DEVCONF_DROP_UNICAST_IN_L2_MULTICAST] = cnf->drop_unicast_in_l2_multicast; 5507 array[DEVCONF_DROP_UNSOLICITED_NA] = cnf->drop_unsolicited_na; 5508 array[DEVCONF_KEEP_ADDR_ON_DOWN] = cnf->keep_addr_on_down; 5509 array[DEVCONF_SEG6_ENABLED] = cnf->seg6_enabled; 5510 #ifdef CONFIG_IPV6_SEG6_HMAC 5511 array[DEVCONF_SEG6_REQUIRE_HMAC] = cnf->seg6_require_hmac; 5512 #endif 5513 array[DEVCONF_ENHANCED_DAD] = cnf->enhanced_dad; 5514 array[DEVCONF_ADDR_GEN_MODE] = cnf->addr_gen_mode; 5515 array[DEVCONF_DISABLE_POLICY] = cnf->disable_policy; 5516 array[DEVCONF_NDISC_TCLASS] = cnf->ndisc_tclass; 5517 array[DEVCONF_RPL_SEG_ENABLED] = cnf->rpl_seg_enabled; 5518 } 5519 5520 static inline size_t inet6_ifla6_size(void) 5521 { 5522 return nla_total_size(4) /* IFLA_INET6_FLAGS */ 5523 + nla_total_size(sizeof(struct ifla_cacheinfo)) 5524 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */ 5525 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */ 5526 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */ 5527 + nla_total_size(sizeof(struct in6_addr)) /* IFLA_INET6_TOKEN */ 5528 + nla_total_size(1) /* IFLA_INET6_ADDR_GEN_MODE */ 5529 + 0; 5530 } 5531 5532 static inline size_t inet6_if_nlmsg_size(void) 5533 { 5534 return NLMSG_ALIGN(sizeof(struct ifinfomsg)) 5535 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */ 5536 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */ 5537 + nla_total_size(4) /* IFLA_MTU */ 5538 + nla_total_size(4) /* IFLA_LINK */ 5539 + nla_total_size(1) /* IFLA_OPERSTATE */ 5540 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */ 5541 } 5542 5543 static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib, 5544 int bytes) 5545 { 5546 int i; 5547 int pad = bytes - sizeof(u64) * ICMP6_MIB_MAX; 5548 BUG_ON(pad < 0); 5549 5550 /* Use put_unaligned() because stats may not be aligned for u64. */ 5551 put_unaligned(ICMP6_MIB_MAX, &stats[0]); 5552 for (i = 1; i < ICMP6_MIB_MAX; i++) 5553 put_unaligned(atomic_long_read(&mib[i]), &stats[i]); 5554 5555 memset(&stats[ICMP6_MIB_MAX], 0, pad); 5556 } 5557 5558 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu *mib, 5559 int bytes, size_t syncpoff) 5560 { 5561 int i, c; 5562 u64 buff[IPSTATS_MIB_MAX]; 5563 int pad = bytes - sizeof(u64) * IPSTATS_MIB_MAX; 5564 5565 BUG_ON(pad < 0); 5566 5567 memset(buff, 0, sizeof(buff)); 5568 buff[0] = IPSTATS_MIB_MAX; 5569 5570 for_each_possible_cpu(c) { 5571 for (i = 1; i < IPSTATS_MIB_MAX; i++) 5572 buff[i] += snmp_get_cpu_field64(mib, c, i, syncpoff); 5573 } 5574 5575 memcpy(stats, buff, IPSTATS_MIB_MAX * sizeof(u64)); 5576 memset(&stats[IPSTATS_MIB_MAX], 0, pad); 5577 } 5578 5579 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype, 5580 int bytes) 5581 { 5582 switch (attrtype) { 5583 case IFLA_INET6_STATS: 5584 __snmp6_fill_stats64(stats, idev->stats.ipv6, bytes, 5585 offsetof(struct ipstats_mib, syncp)); 5586 break; 5587 case IFLA_INET6_ICMP6STATS: 5588 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, bytes); 5589 break; 5590 } 5591 } 5592 5593 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev, 5594 u32 ext_filter_mask) 5595 { 5596 struct nlattr *nla; 5597 struct ifla_cacheinfo ci; 5598 5599 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags)) 5600 goto nla_put_failure; 5601 ci.max_reasm_len = IPV6_MAXPLEN; 5602 ci.tstamp = cstamp_delta(idev->tstamp); 5603 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time); 5604 ci.retrans_time = jiffies_to_msecs(NEIGH_VAR(idev->nd_parms, RETRANS_TIME)); 5605 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci)) 5606 goto nla_put_failure; 5607 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32)); 5608 if (!nla) 5609 goto nla_put_failure; 5610 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla)); 5611 5612 /* XXX - MC not implemented */ 5613 5614 if (ext_filter_mask & RTEXT_FILTER_SKIP_STATS) 5615 return 0; 5616 5617 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64)); 5618 if (!nla) 5619 goto nla_put_failure; 5620 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla)); 5621 5622 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64)); 5623 if (!nla) 5624 goto nla_put_failure; 5625 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla)); 5626 5627 nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr)); 5628 if (!nla) 5629 goto nla_put_failure; 5630 read_lock_bh(&idev->lock); 5631 memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla)); 5632 read_unlock_bh(&idev->lock); 5633 5634 if (nla_put_u8(skb, IFLA_INET6_ADDR_GEN_MODE, idev->cnf.addr_gen_mode)) 5635 goto nla_put_failure; 5636 5637 return 0; 5638 5639 nla_put_failure: 5640 return -EMSGSIZE; 5641 } 5642 5643 static size_t inet6_get_link_af_size(const struct net_device *dev, 5644 u32 ext_filter_mask) 5645 { 5646 if (!__in6_dev_get(dev)) 5647 return 0; 5648 5649 return inet6_ifla6_size(); 5650 } 5651 5652 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev, 5653 u32 ext_filter_mask) 5654 { 5655 struct inet6_dev *idev = __in6_dev_get(dev); 5656 5657 if (!idev) 5658 return -ENODATA; 5659 5660 if (inet6_fill_ifla6_attrs(skb, idev, ext_filter_mask) < 0) 5661 return -EMSGSIZE; 5662 5663 return 0; 5664 } 5665 5666 static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token) 5667 { 5668 struct inet6_ifaddr *ifp; 5669 struct net_device *dev = idev->dev; 5670 bool clear_token, update_rs = false; 5671 struct in6_addr ll_addr; 5672 5673 ASSERT_RTNL(); 5674 5675 if (!token) 5676 return -EINVAL; 5677 if (dev->flags & (IFF_LOOPBACK | IFF_NOARP)) 5678 return -EINVAL; 5679 if (!ipv6_accept_ra(idev)) 5680 return -EINVAL; 5681 if (idev->cnf.rtr_solicits == 0) 5682 return -EINVAL; 5683 5684 write_lock_bh(&idev->lock); 5685 5686 BUILD_BUG_ON(sizeof(token->s6_addr) != 16); 5687 memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8); 5688 5689 write_unlock_bh(&idev->lock); 5690 5691 clear_token = ipv6_addr_any(token); 5692 if (clear_token) 5693 goto update_lft; 5694 5695 if (!idev->dead && (idev->if_flags & IF_READY) && 5696 !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE | 5697 IFA_F_OPTIMISTIC)) { 5698 /* If we're not ready, then normal ifup will take care 5699 * of this. Otherwise, we need to request our rs here. 5700 */ 5701 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters); 5702 update_rs = true; 5703 } 5704 5705 update_lft: 5706 write_lock_bh(&idev->lock); 5707 5708 if (update_rs) { 5709 idev->if_flags |= IF_RS_SENT; 5710 idev->rs_interval = rfc3315_s14_backoff_init( 5711 idev->cnf.rtr_solicit_interval); 5712 idev->rs_probes = 1; 5713 addrconf_mod_rs_timer(idev, idev->rs_interval); 5714 } 5715 5716 /* Well, that's kinda nasty ... */ 5717 list_for_each_entry(ifp, &idev->addr_list, if_list) { 5718 spin_lock(&ifp->lock); 5719 if (ifp->tokenized) { 5720 ifp->valid_lft = 0; 5721 ifp->prefered_lft = 0; 5722 } 5723 spin_unlock(&ifp->lock); 5724 } 5725 5726 write_unlock_bh(&idev->lock); 5727 inet6_ifinfo_notify(RTM_NEWLINK, idev); 5728 addrconf_verify_rtnl(); 5729 return 0; 5730 } 5731 5732 static const struct nla_policy inet6_af_policy[IFLA_INET6_MAX + 1] = { 5733 [IFLA_INET6_ADDR_GEN_MODE] = { .type = NLA_U8 }, 5734 [IFLA_INET6_TOKEN] = { .len = sizeof(struct in6_addr) }, 5735 }; 5736 5737 static int check_addr_gen_mode(int mode) 5738 { 5739 if (mode != IN6_ADDR_GEN_MODE_EUI64 && 5740 mode != IN6_ADDR_GEN_MODE_NONE && 5741 mode != IN6_ADDR_GEN_MODE_STABLE_PRIVACY && 5742 mode != IN6_ADDR_GEN_MODE_RANDOM) 5743 return -EINVAL; 5744 return 1; 5745 } 5746 5747 static int check_stable_privacy(struct inet6_dev *idev, struct net *net, 5748 int mode) 5749 { 5750 if (mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY && 5751 !idev->cnf.stable_secret.initialized && 5752 !net->ipv6.devconf_dflt->stable_secret.initialized) 5753 return -EINVAL; 5754 return 1; 5755 } 5756 5757 static int inet6_validate_link_af(const struct net_device *dev, 5758 const struct nlattr *nla) 5759 { 5760 struct nlattr *tb[IFLA_INET6_MAX + 1]; 5761 struct inet6_dev *idev = NULL; 5762 int err; 5763 5764 if (dev) { 5765 idev = __in6_dev_get(dev); 5766 if (!idev) 5767 return -EAFNOSUPPORT; 5768 } 5769 5770 err = nla_parse_nested_deprecated(tb, IFLA_INET6_MAX, nla, 5771 inet6_af_policy, NULL); 5772 if (err) 5773 return err; 5774 5775 if (!tb[IFLA_INET6_TOKEN] && !tb[IFLA_INET6_ADDR_GEN_MODE]) 5776 return -EINVAL; 5777 5778 if (tb[IFLA_INET6_ADDR_GEN_MODE]) { 5779 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]); 5780 5781 if (check_addr_gen_mode(mode) < 0) 5782 return -EINVAL; 5783 if (dev && check_stable_privacy(idev, dev_net(dev), mode) < 0) 5784 return -EINVAL; 5785 } 5786 5787 return 0; 5788 } 5789 5790 static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla) 5791 { 5792 struct inet6_dev *idev = __in6_dev_get(dev); 5793 struct nlattr *tb[IFLA_INET6_MAX + 1]; 5794 int err; 5795 5796 if (!idev) 5797 return -EAFNOSUPPORT; 5798 5799 if (nla_parse_nested_deprecated(tb, IFLA_INET6_MAX, nla, NULL, NULL) < 0) 5800 BUG(); 5801 5802 if (tb[IFLA_INET6_TOKEN]) { 5803 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN])); 5804 if (err) 5805 return err; 5806 } 5807 5808 if (tb[IFLA_INET6_ADDR_GEN_MODE]) { 5809 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]); 5810 5811 idev->cnf.addr_gen_mode = mode; 5812 } 5813 5814 return 0; 5815 } 5816 5817 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev, 5818 u32 portid, u32 seq, int event, unsigned int flags) 5819 { 5820 struct net_device *dev = idev->dev; 5821 struct ifinfomsg *hdr; 5822 struct nlmsghdr *nlh; 5823 void *protoinfo; 5824 5825 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags); 5826 if (!nlh) 5827 return -EMSGSIZE; 5828 5829 hdr = nlmsg_data(nlh); 5830 hdr->ifi_family = AF_INET6; 5831 hdr->__ifi_pad = 0; 5832 hdr->ifi_type = dev->type; 5833 hdr->ifi_index = dev->ifindex; 5834 hdr->ifi_flags = dev_get_flags(dev); 5835 hdr->ifi_change = 0; 5836 5837 if (nla_put_string(skb, IFLA_IFNAME, dev->name) || 5838 (dev->addr_len && 5839 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) || 5840 nla_put_u32(skb, IFLA_MTU, dev->mtu) || 5841 (dev->ifindex != dev_get_iflink(dev) && 5842 nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))) || 5843 nla_put_u8(skb, IFLA_OPERSTATE, 5844 netif_running(dev) ? dev->operstate : IF_OPER_DOWN)) 5845 goto nla_put_failure; 5846 protoinfo = nla_nest_start_noflag(skb, IFLA_PROTINFO); 5847 if (!protoinfo) 5848 goto nla_put_failure; 5849 5850 if (inet6_fill_ifla6_attrs(skb, idev, 0) < 0) 5851 goto nla_put_failure; 5852 5853 nla_nest_end(skb, protoinfo); 5854 nlmsg_end(skb, nlh); 5855 return 0; 5856 5857 nla_put_failure: 5858 nlmsg_cancel(skb, nlh); 5859 return -EMSGSIZE; 5860 } 5861 5862 static int inet6_valid_dump_ifinfo(const struct nlmsghdr *nlh, 5863 struct netlink_ext_ack *extack) 5864 { 5865 struct ifinfomsg *ifm; 5866 5867 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) { 5868 NL_SET_ERR_MSG_MOD(extack, "Invalid header for link dump request"); 5869 return -EINVAL; 5870 } 5871 5872 if (nlmsg_attrlen(nlh, sizeof(*ifm))) { 5873 NL_SET_ERR_MSG_MOD(extack, "Invalid data after header"); 5874 return -EINVAL; 5875 } 5876 5877 ifm = nlmsg_data(nlh); 5878 if (ifm->__ifi_pad || ifm->ifi_type || ifm->ifi_flags || 5879 ifm->ifi_change || ifm->ifi_index) { 5880 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for dump request"); 5881 return -EINVAL; 5882 } 5883 5884 return 0; 5885 } 5886 5887 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb) 5888 { 5889 struct net *net = sock_net(skb->sk); 5890 int h, s_h; 5891 int idx = 0, s_idx; 5892 struct net_device *dev; 5893 struct inet6_dev *idev; 5894 struct hlist_head *head; 5895 5896 /* only requests using strict checking can pass data to 5897 * influence the dump 5898 */ 5899 if (cb->strict_check) { 5900 int err = inet6_valid_dump_ifinfo(cb->nlh, cb->extack); 5901 5902 if (err < 0) 5903 return err; 5904 } 5905 5906 s_h = cb->args[0]; 5907 s_idx = cb->args[1]; 5908 5909 rcu_read_lock(); 5910 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 5911 idx = 0; 5912 head = &net->dev_index_head[h]; 5913 hlist_for_each_entry_rcu(dev, head, index_hlist) { 5914 if (idx < s_idx) 5915 goto cont; 5916 idev = __in6_dev_get(dev); 5917 if (!idev) 5918 goto cont; 5919 if (inet6_fill_ifinfo(skb, idev, 5920 NETLINK_CB(cb->skb).portid, 5921 cb->nlh->nlmsg_seq, 5922 RTM_NEWLINK, NLM_F_MULTI) < 0) 5923 goto out; 5924 cont: 5925 idx++; 5926 } 5927 } 5928 out: 5929 rcu_read_unlock(); 5930 cb->args[1] = idx; 5931 cb->args[0] = h; 5932 5933 return skb->len; 5934 } 5935 5936 void inet6_ifinfo_notify(int event, struct inet6_dev *idev) 5937 { 5938 struct sk_buff *skb; 5939 struct net *net = dev_net(idev->dev); 5940 int err = -ENOBUFS; 5941 5942 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC); 5943 if (!skb) 5944 goto errout; 5945 5946 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0); 5947 if (err < 0) { 5948 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */ 5949 WARN_ON(err == -EMSGSIZE); 5950 kfree_skb(skb); 5951 goto errout; 5952 } 5953 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC); 5954 return; 5955 errout: 5956 if (err < 0) 5957 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err); 5958 } 5959 5960 static inline size_t inet6_prefix_nlmsg_size(void) 5961 { 5962 return NLMSG_ALIGN(sizeof(struct prefixmsg)) 5963 + nla_total_size(sizeof(struct in6_addr)) 5964 + nla_total_size(sizeof(struct prefix_cacheinfo)); 5965 } 5966 5967 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev, 5968 struct prefix_info *pinfo, u32 portid, u32 seq, 5969 int event, unsigned int flags) 5970 { 5971 struct prefixmsg *pmsg; 5972 struct nlmsghdr *nlh; 5973 struct prefix_cacheinfo ci; 5974 5975 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags); 5976 if (!nlh) 5977 return -EMSGSIZE; 5978 5979 pmsg = nlmsg_data(nlh); 5980 pmsg->prefix_family = AF_INET6; 5981 pmsg->prefix_pad1 = 0; 5982 pmsg->prefix_pad2 = 0; 5983 pmsg->prefix_ifindex = idev->dev->ifindex; 5984 pmsg->prefix_len = pinfo->prefix_len; 5985 pmsg->prefix_type = pinfo->type; 5986 pmsg->prefix_pad3 = 0; 5987 pmsg->prefix_flags = 0; 5988 if (pinfo->onlink) 5989 pmsg->prefix_flags |= IF_PREFIX_ONLINK; 5990 if (pinfo->autoconf) 5991 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF; 5992 5993 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix)) 5994 goto nla_put_failure; 5995 ci.preferred_time = ntohl(pinfo->prefered); 5996 ci.valid_time = ntohl(pinfo->valid); 5997 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci)) 5998 goto nla_put_failure; 5999 nlmsg_end(skb, nlh); 6000 return 0; 6001 6002 nla_put_failure: 6003 nlmsg_cancel(skb, nlh); 6004 return -EMSGSIZE; 6005 } 6006 6007 static void inet6_prefix_notify(int event, struct inet6_dev *idev, 6008 struct prefix_info *pinfo) 6009 { 6010 struct sk_buff *skb; 6011 struct net *net = dev_net(idev->dev); 6012 int err = -ENOBUFS; 6013 6014 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC); 6015 if (!skb) 6016 goto errout; 6017 6018 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0); 6019 if (err < 0) { 6020 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */ 6021 WARN_ON(err == -EMSGSIZE); 6022 kfree_skb(skb); 6023 goto errout; 6024 } 6025 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC); 6026 return; 6027 errout: 6028 if (err < 0) 6029 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err); 6030 } 6031 6032 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 6033 { 6034 struct net *net = dev_net(ifp->idev->dev); 6035 6036 if (event) 6037 ASSERT_RTNL(); 6038 6039 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp); 6040 6041 switch (event) { 6042 case RTM_NEWADDR: 6043 /* 6044 * If the address was optimistic we inserted the route at the 6045 * start of our DAD process, so we don't need to do it again. 6046 * If the device was taken down in the middle of the DAD 6047 * cycle there is a race where we could get here without a 6048 * host route, so nothing to insert. That will be fixed when 6049 * the device is brought up. 6050 */ 6051 if (ifp->rt && !rcu_access_pointer(ifp->rt->fib6_node)) { 6052 ip6_ins_rt(net, ifp->rt); 6053 } else if (!ifp->rt && (ifp->idev->dev->flags & IFF_UP)) { 6054 pr_warn("BUG: Address %pI6c on device %s is missing its host route.\n", 6055 &ifp->addr, ifp->idev->dev->name); 6056 } 6057 6058 if (ifp->idev->cnf.forwarding) 6059 addrconf_join_anycast(ifp); 6060 if (!ipv6_addr_any(&ifp->peer_addr)) 6061 addrconf_prefix_route(&ifp->peer_addr, 128, 6062 ifp->rt_priority, ifp->idev->dev, 6063 0, 0, GFP_ATOMIC); 6064 break; 6065 case RTM_DELADDR: 6066 if (ifp->idev->cnf.forwarding) 6067 addrconf_leave_anycast(ifp); 6068 addrconf_leave_solict(ifp->idev, &ifp->addr); 6069 if (!ipv6_addr_any(&ifp->peer_addr)) { 6070 struct fib6_info *rt; 6071 6072 rt = addrconf_get_prefix_route(&ifp->peer_addr, 128, 6073 ifp->idev->dev, 0, 0, 6074 false); 6075 if (rt) 6076 ip6_del_rt(net, rt, false); 6077 } 6078 if (ifp->rt) { 6079 ip6_del_rt(net, ifp->rt, false); 6080 ifp->rt = NULL; 6081 } 6082 rt_genid_bump_ipv6(net); 6083 break; 6084 } 6085 atomic_inc(&net->ipv6.dev_addr_genid); 6086 } 6087 6088 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 6089 { 6090 rcu_read_lock_bh(); 6091 if (likely(ifp->idev->dead == 0)) 6092 __ipv6_ifa_notify(event, ifp); 6093 rcu_read_unlock_bh(); 6094 } 6095 6096 #ifdef CONFIG_SYSCTL 6097 6098 static 6099 int addrconf_sysctl_forward(struct ctl_table *ctl, int write, 6100 void __user *buffer, size_t *lenp, loff_t *ppos) 6101 { 6102 int *valp = ctl->data; 6103 int val = *valp; 6104 loff_t pos = *ppos; 6105 struct ctl_table lctl; 6106 int ret; 6107 6108 /* 6109 * ctl->data points to idev->cnf.forwarding, we should 6110 * not modify it until we get the rtnl lock. 6111 */ 6112 lctl = *ctl; 6113 lctl.data = &val; 6114 6115 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 6116 6117 if (write) 6118 ret = addrconf_fixup_forwarding(ctl, valp, val); 6119 if (ret) 6120 *ppos = pos; 6121 return ret; 6122 } 6123 6124 static 6125 int addrconf_sysctl_mtu(struct ctl_table *ctl, int write, 6126 void __user *buffer, size_t *lenp, loff_t *ppos) 6127 { 6128 struct inet6_dev *idev = ctl->extra1; 6129 int min_mtu = IPV6_MIN_MTU; 6130 struct ctl_table lctl; 6131 6132 lctl = *ctl; 6133 lctl.extra1 = &min_mtu; 6134 lctl.extra2 = idev ? &idev->dev->mtu : NULL; 6135 6136 return proc_dointvec_minmax(&lctl, write, buffer, lenp, ppos); 6137 } 6138 6139 static void dev_disable_change(struct inet6_dev *idev) 6140 { 6141 struct netdev_notifier_info info; 6142 6143 if (!idev || !idev->dev) 6144 return; 6145 6146 netdev_notifier_info_init(&info, idev->dev); 6147 if (idev->cnf.disable_ipv6) 6148 addrconf_notify(NULL, NETDEV_DOWN, &info); 6149 else 6150 addrconf_notify(NULL, NETDEV_UP, &info); 6151 } 6152 6153 static void addrconf_disable_change(struct net *net, __s32 newf) 6154 { 6155 struct net_device *dev; 6156 struct inet6_dev *idev; 6157 6158 for_each_netdev(net, dev) { 6159 idev = __in6_dev_get(dev); 6160 if (idev) { 6161 int changed = (!idev->cnf.disable_ipv6) ^ (!newf); 6162 idev->cnf.disable_ipv6 = newf; 6163 if (changed) 6164 dev_disable_change(idev); 6165 } 6166 } 6167 } 6168 6169 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf) 6170 { 6171 struct net *net; 6172 int old; 6173 6174 if (!rtnl_trylock()) 6175 return restart_syscall(); 6176 6177 net = (struct net *)table->extra2; 6178 old = *p; 6179 *p = newf; 6180 6181 if (p == &net->ipv6.devconf_dflt->disable_ipv6) { 6182 rtnl_unlock(); 6183 return 0; 6184 } 6185 6186 if (p == &net->ipv6.devconf_all->disable_ipv6) { 6187 net->ipv6.devconf_dflt->disable_ipv6 = newf; 6188 addrconf_disable_change(net, newf); 6189 } else if ((!newf) ^ (!old)) 6190 dev_disable_change((struct inet6_dev *)table->extra1); 6191 6192 rtnl_unlock(); 6193 return 0; 6194 } 6195 6196 static 6197 int addrconf_sysctl_disable(struct ctl_table *ctl, int write, 6198 void __user *buffer, size_t *lenp, loff_t *ppos) 6199 { 6200 int *valp = ctl->data; 6201 int val = *valp; 6202 loff_t pos = *ppos; 6203 struct ctl_table lctl; 6204 int ret; 6205 6206 /* 6207 * ctl->data points to idev->cnf.disable_ipv6, we should 6208 * not modify it until we get the rtnl lock. 6209 */ 6210 lctl = *ctl; 6211 lctl.data = &val; 6212 6213 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 6214 6215 if (write) 6216 ret = addrconf_disable_ipv6(ctl, valp, val); 6217 if (ret) 6218 *ppos = pos; 6219 return ret; 6220 } 6221 6222 static 6223 int addrconf_sysctl_proxy_ndp(struct ctl_table *ctl, int write, 6224 void __user *buffer, size_t *lenp, loff_t *ppos) 6225 { 6226 int *valp = ctl->data; 6227 int ret; 6228 int old, new; 6229 6230 old = *valp; 6231 ret = proc_dointvec(ctl, write, buffer, lenp, ppos); 6232 new = *valp; 6233 6234 if (write && old != new) { 6235 struct net *net = ctl->extra2; 6236 6237 if (!rtnl_trylock()) 6238 return restart_syscall(); 6239 6240 if (valp == &net->ipv6.devconf_dflt->proxy_ndp) 6241 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 6242 NETCONFA_PROXY_NEIGH, 6243 NETCONFA_IFINDEX_DEFAULT, 6244 net->ipv6.devconf_dflt); 6245 else if (valp == &net->ipv6.devconf_all->proxy_ndp) 6246 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 6247 NETCONFA_PROXY_NEIGH, 6248 NETCONFA_IFINDEX_ALL, 6249 net->ipv6.devconf_all); 6250 else { 6251 struct inet6_dev *idev = ctl->extra1; 6252 6253 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 6254 NETCONFA_PROXY_NEIGH, 6255 idev->dev->ifindex, 6256 &idev->cnf); 6257 } 6258 rtnl_unlock(); 6259 } 6260 6261 return ret; 6262 } 6263 6264 static int addrconf_sysctl_addr_gen_mode(struct ctl_table *ctl, int write, 6265 void __user *buffer, size_t *lenp, 6266 loff_t *ppos) 6267 { 6268 int ret = 0; 6269 u32 new_val; 6270 struct inet6_dev *idev = (struct inet6_dev *)ctl->extra1; 6271 struct net *net = (struct net *)ctl->extra2; 6272 struct ctl_table tmp = { 6273 .data = &new_val, 6274 .maxlen = sizeof(new_val), 6275 .mode = ctl->mode, 6276 }; 6277 6278 if (!rtnl_trylock()) 6279 return restart_syscall(); 6280 6281 new_val = *((u32 *)ctl->data); 6282 6283 ret = proc_douintvec(&tmp, write, buffer, lenp, ppos); 6284 if (ret != 0) 6285 goto out; 6286 6287 if (write) { 6288 if (check_addr_gen_mode(new_val) < 0) { 6289 ret = -EINVAL; 6290 goto out; 6291 } 6292 6293 if (idev) { 6294 if (check_stable_privacy(idev, net, new_val) < 0) { 6295 ret = -EINVAL; 6296 goto out; 6297 } 6298 6299 if (idev->cnf.addr_gen_mode != new_val) { 6300 idev->cnf.addr_gen_mode = new_val; 6301 addrconf_dev_config(idev->dev); 6302 } 6303 } else if (&net->ipv6.devconf_all->addr_gen_mode == ctl->data) { 6304 struct net_device *dev; 6305 6306 net->ipv6.devconf_dflt->addr_gen_mode = new_val; 6307 for_each_netdev(net, dev) { 6308 idev = __in6_dev_get(dev); 6309 if (idev && 6310 idev->cnf.addr_gen_mode != new_val) { 6311 idev->cnf.addr_gen_mode = new_val; 6312 addrconf_dev_config(idev->dev); 6313 } 6314 } 6315 } 6316 6317 *((u32 *)ctl->data) = new_val; 6318 } 6319 6320 out: 6321 rtnl_unlock(); 6322 6323 return ret; 6324 } 6325 6326 static int addrconf_sysctl_stable_secret(struct ctl_table *ctl, int write, 6327 void __user *buffer, size_t *lenp, 6328 loff_t *ppos) 6329 { 6330 int err; 6331 struct in6_addr addr; 6332 char str[IPV6_MAX_STRLEN]; 6333 struct ctl_table lctl = *ctl; 6334 struct net *net = ctl->extra2; 6335 struct ipv6_stable_secret *secret = ctl->data; 6336 6337 if (&net->ipv6.devconf_all->stable_secret == ctl->data) 6338 return -EIO; 6339 6340 lctl.maxlen = IPV6_MAX_STRLEN; 6341 lctl.data = str; 6342 6343 if (!rtnl_trylock()) 6344 return restart_syscall(); 6345 6346 if (!write && !secret->initialized) { 6347 err = -EIO; 6348 goto out; 6349 } 6350 6351 err = snprintf(str, sizeof(str), "%pI6", &secret->secret); 6352 if (err >= sizeof(str)) { 6353 err = -EIO; 6354 goto out; 6355 } 6356 6357 err = proc_dostring(&lctl, write, buffer, lenp, ppos); 6358 if (err || !write) 6359 goto out; 6360 6361 if (in6_pton(str, -1, addr.in6_u.u6_addr8, -1, NULL) != 1) { 6362 err = -EIO; 6363 goto out; 6364 } 6365 6366 secret->initialized = true; 6367 secret->secret = addr; 6368 6369 if (&net->ipv6.devconf_dflt->stable_secret == ctl->data) { 6370 struct net_device *dev; 6371 6372 for_each_netdev(net, dev) { 6373 struct inet6_dev *idev = __in6_dev_get(dev); 6374 6375 if (idev) { 6376 idev->cnf.addr_gen_mode = 6377 IN6_ADDR_GEN_MODE_STABLE_PRIVACY; 6378 } 6379 } 6380 } else { 6381 struct inet6_dev *idev = ctl->extra1; 6382 6383 idev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY; 6384 } 6385 6386 out: 6387 rtnl_unlock(); 6388 6389 return err; 6390 } 6391 6392 static 6393 int addrconf_sysctl_ignore_routes_with_linkdown(struct ctl_table *ctl, 6394 int write, 6395 void __user *buffer, 6396 size_t *lenp, 6397 loff_t *ppos) 6398 { 6399 int *valp = ctl->data; 6400 int val = *valp; 6401 loff_t pos = *ppos; 6402 struct ctl_table lctl; 6403 int ret; 6404 6405 /* ctl->data points to idev->cnf.ignore_routes_when_linkdown 6406 * we should not modify it until we get the rtnl lock. 6407 */ 6408 lctl = *ctl; 6409 lctl.data = &val; 6410 6411 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 6412 6413 if (write) 6414 ret = addrconf_fixup_linkdown(ctl, valp, val); 6415 if (ret) 6416 *ppos = pos; 6417 return ret; 6418 } 6419 6420 static 6421 void addrconf_set_nopolicy(struct rt6_info *rt, int action) 6422 { 6423 if (rt) { 6424 if (action) 6425 rt->dst.flags |= DST_NOPOLICY; 6426 else 6427 rt->dst.flags &= ~DST_NOPOLICY; 6428 } 6429 } 6430 6431 static 6432 void addrconf_disable_policy_idev(struct inet6_dev *idev, int val) 6433 { 6434 struct inet6_ifaddr *ifa; 6435 6436 read_lock_bh(&idev->lock); 6437 list_for_each_entry(ifa, &idev->addr_list, if_list) { 6438 spin_lock(&ifa->lock); 6439 if (ifa->rt) { 6440 /* host routes only use builtin fib6_nh */ 6441 struct fib6_nh *nh = ifa->rt->fib6_nh; 6442 int cpu; 6443 6444 rcu_read_lock(); 6445 ifa->rt->dst_nopolicy = val ? true : false; 6446 if (nh->rt6i_pcpu) { 6447 for_each_possible_cpu(cpu) { 6448 struct rt6_info **rtp; 6449 6450 rtp = per_cpu_ptr(nh->rt6i_pcpu, cpu); 6451 addrconf_set_nopolicy(*rtp, val); 6452 } 6453 } 6454 rcu_read_unlock(); 6455 } 6456 spin_unlock(&ifa->lock); 6457 } 6458 read_unlock_bh(&idev->lock); 6459 } 6460 6461 static 6462 int addrconf_disable_policy(struct ctl_table *ctl, int *valp, int val) 6463 { 6464 struct inet6_dev *idev; 6465 struct net *net; 6466 6467 if (!rtnl_trylock()) 6468 return restart_syscall(); 6469 6470 *valp = val; 6471 6472 net = (struct net *)ctl->extra2; 6473 if (valp == &net->ipv6.devconf_dflt->disable_policy) { 6474 rtnl_unlock(); 6475 return 0; 6476 } 6477 6478 if (valp == &net->ipv6.devconf_all->disable_policy) { 6479 struct net_device *dev; 6480 6481 for_each_netdev(net, dev) { 6482 idev = __in6_dev_get(dev); 6483 if (idev) 6484 addrconf_disable_policy_idev(idev, val); 6485 } 6486 } else { 6487 idev = (struct inet6_dev *)ctl->extra1; 6488 addrconf_disable_policy_idev(idev, val); 6489 } 6490 6491 rtnl_unlock(); 6492 return 0; 6493 } 6494 6495 static 6496 int addrconf_sysctl_disable_policy(struct ctl_table *ctl, int write, 6497 void __user *buffer, size_t *lenp, 6498 loff_t *ppos) 6499 { 6500 int *valp = ctl->data; 6501 int val = *valp; 6502 loff_t pos = *ppos; 6503 struct ctl_table lctl; 6504 int ret; 6505 6506 lctl = *ctl; 6507 lctl.data = &val; 6508 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 6509 6510 if (write && (*valp != val)) 6511 ret = addrconf_disable_policy(ctl, valp, val); 6512 6513 if (ret) 6514 *ppos = pos; 6515 6516 return ret; 6517 } 6518 6519 static int minus_one = -1; 6520 static const int two_five_five = 255; 6521 6522 static const struct ctl_table addrconf_sysctl[] = { 6523 { 6524 .procname = "forwarding", 6525 .data = &ipv6_devconf.forwarding, 6526 .maxlen = sizeof(int), 6527 .mode = 0644, 6528 .proc_handler = addrconf_sysctl_forward, 6529 }, 6530 { 6531 .procname = "hop_limit", 6532 .data = &ipv6_devconf.hop_limit, 6533 .maxlen = sizeof(int), 6534 .mode = 0644, 6535 .proc_handler = proc_dointvec_minmax, 6536 .extra1 = (void *)SYSCTL_ONE, 6537 .extra2 = (void *)&two_five_five, 6538 }, 6539 { 6540 .procname = "mtu", 6541 .data = &ipv6_devconf.mtu6, 6542 .maxlen = sizeof(int), 6543 .mode = 0644, 6544 .proc_handler = addrconf_sysctl_mtu, 6545 }, 6546 { 6547 .procname = "accept_ra", 6548 .data = &ipv6_devconf.accept_ra, 6549 .maxlen = sizeof(int), 6550 .mode = 0644, 6551 .proc_handler = proc_dointvec, 6552 }, 6553 { 6554 .procname = "accept_redirects", 6555 .data = &ipv6_devconf.accept_redirects, 6556 .maxlen = sizeof(int), 6557 .mode = 0644, 6558 .proc_handler = proc_dointvec, 6559 }, 6560 { 6561 .procname = "autoconf", 6562 .data = &ipv6_devconf.autoconf, 6563 .maxlen = sizeof(int), 6564 .mode = 0644, 6565 .proc_handler = proc_dointvec, 6566 }, 6567 { 6568 .procname = "dad_transmits", 6569 .data = &ipv6_devconf.dad_transmits, 6570 .maxlen = sizeof(int), 6571 .mode = 0644, 6572 .proc_handler = proc_dointvec, 6573 }, 6574 { 6575 .procname = "router_solicitations", 6576 .data = &ipv6_devconf.rtr_solicits, 6577 .maxlen = sizeof(int), 6578 .mode = 0644, 6579 .proc_handler = proc_dointvec_minmax, 6580 .extra1 = &minus_one, 6581 }, 6582 { 6583 .procname = "router_solicitation_interval", 6584 .data = &ipv6_devconf.rtr_solicit_interval, 6585 .maxlen = sizeof(int), 6586 .mode = 0644, 6587 .proc_handler = proc_dointvec_jiffies, 6588 }, 6589 { 6590 .procname = "router_solicitation_max_interval", 6591 .data = &ipv6_devconf.rtr_solicit_max_interval, 6592 .maxlen = sizeof(int), 6593 .mode = 0644, 6594 .proc_handler = proc_dointvec_jiffies, 6595 }, 6596 { 6597 .procname = "router_solicitation_delay", 6598 .data = &ipv6_devconf.rtr_solicit_delay, 6599 .maxlen = sizeof(int), 6600 .mode = 0644, 6601 .proc_handler = proc_dointvec_jiffies, 6602 }, 6603 { 6604 .procname = "force_mld_version", 6605 .data = &ipv6_devconf.force_mld_version, 6606 .maxlen = sizeof(int), 6607 .mode = 0644, 6608 .proc_handler = proc_dointvec, 6609 }, 6610 { 6611 .procname = "mldv1_unsolicited_report_interval", 6612 .data = 6613 &ipv6_devconf.mldv1_unsolicited_report_interval, 6614 .maxlen = sizeof(int), 6615 .mode = 0644, 6616 .proc_handler = proc_dointvec_ms_jiffies, 6617 }, 6618 { 6619 .procname = "mldv2_unsolicited_report_interval", 6620 .data = 6621 &ipv6_devconf.mldv2_unsolicited_report_interval, 6622 .maxlen = sizeof(int), 6623 .mode = 0644, 6624 .proc_handler = proc_dointvec_ms_jiffies, 6625 }, 6626 { 6627 .procname = "use_tempaddr", 6628 .data = &ipv6_devconf.use_tempaddr, 6629 .maxlen = sizeof(int), 6630 .mode = 0644, 6631 .proc_handler = proc_dointvec, 6632 }, 6633 { 6634 .procname = "temp_valid_lft", 6635 .data = &ipv6_devconf.temp_valid_lft, 6636 .maxlen = sizeof(int), 6637 .mode = 0644, 6638 .proc_handler = proc_dointvec, 6639 }, 6640 { 6641 .procname = "temp_prefered_lft", 6642 .data = &ipv6_devconf.temp_prefered_lft, 6643 .maxlen = sizeof(int), 6644 .mode = 0644, 6645 .proc_handler = proc_dointvec, 6646 }, 6647 { 6648 .procname = "regen_max_retry", 6649 .data = &ipv6_devconf.regen_max_retry, 6650 .maxlen = sizeof(int), 6651 .mode = 0644, 6652 .proc_handler = proc_dointvec, 6653 }, 6654 { 6655 .procname = "max_desync_factor", 6656 .data = &ipv6_devconf.max_desync_factor, 6657 .maxlen = sizeof(int), 6658 .mode = 0644, 6659 .proc_handler = proc_dointvec, 6660 }, 6661 { 6662 .procname = "max_addresses", 6663 .data = &ipv6_devconf.max_addresses, 6664 .maxlen = sizeof(int), 6665 .mode = 0644, 6666 .proc_handler = proc_dointvec, 6667 }, 6668 { 6669 .procname = "accept_ra_defrtr", 6670 .data = &ipv6_devconf.accept_ra_defrtr, 6671 .maxlen = sizeof(int), 6672 .mode = 0644, 6673 .proc_handler = proc_dointvec, 6674 }, 6675 { 6676 .procname = "accept_ra_min_hop_limit", 6677 .data = &ipv6_devconf.accept_ra_min_hop_limit, 6678 .maxlen = sizeof(int), 6679 .mode = 0644, 6680 .proc_handler = proc_dointvec, 6681 }, 6682 { 6683 .procname = "accept_ra_pinfo", 6684 .data = &ipv6_devconf.accept_ra_pinfo, 6685 .maxlen = sizeof(int), 6686 .mode = 0644, 6687 .proc_handler = proc_dointvec, 6688 }, 6689 #ifdef CONFIG_IPV6_ROUTER_PREF 6690 { 6691 .procname = "accept_ra_rtr_pref", 6692 .data = &ipv6_devconf.accept_ra_rtr_pref, 6693 .maxlen = sizeof(int), 6694 .mode = 0644, 6695 .proc_handler = proc_dointvec, 6696 }, 6697 { 6698 .procname = "router_probe_interval", 6699 .data = &ipv6_devconf.rtr_probe_interval, 6700 .maxlen = sizeof(int), 6701 .mode = 0644, 6702 .proc_handler = proc_dointvec_jiffies, 6703 }, 6704 #ifdef CONFIG_IPV6_ROUTE_INFO 6705 { 6706 .procname = "accept_ra_rt_info_min_plen", 6707 .data = &ipv6_devconf.accept_ra_rt_info_min_plen, 6708 .maxlen = sizeof(int), 6709 .mode = 0644, 6710 .proc_handler = proc_dointvec, 6711 }, 6712 { 6713 .procname = "accept_ra_rt_info_max_plen", 6714 .data = &ipv6_devconf.accept_ra_rt_info_max_plen, 6715 .maxlen = sizeof(int), 6716 .mode = 0644, 6717 .proc_handler = proc_dointvec, 6718 }, 6719 #endif 6720 #endif 6721 { 6722 .procname = "proxy_ndp", 6723 .data = &ipv6_devconf.proxy_ndp, 6724 .maxlen = sizeof(int), 6725 .mode = 0644, 6726 .proc_handler = addrconf_sysctl_proxy_ndp, 6727 }, 6728 { 6729 .procname = "accept_source_route", 6730 .data = &ipv6_devconf.accept_source_route, 6731 .maxlen = sizeof(int), 6732 .mode = 0644, 6733 .proc_handler = proc_dointvec, 6734 }, 6735 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 6736 { 6737 .procname = "optimistic_dad", 6738 .data = &ipv6_devconf.optimistic_dad, 6739 .maxlen = sizeof(int), 6740 .mode = 0644, 6741 .proc_handler = proc_dointvec, 6742 }, 6743 { 6744 .procname = "use_optimistic", 6745 .data = &ipv6_devconf.use_optimistic, 6746 .maxlen = sizeof(int), 6747 .mode = 0644, 6748 .proc_handler = proc_dointvec, 6749 }, 6750 #endif 6751 #ifdef CONFIG_IPV6_MROUTE 6752 { 6753 .procname = "mc_forwarding", 6754 .data = &ipv6_devconf.mc_forwarding, 6755 .maxlen = sizeof(int), 6756 .mode = 0444, 6757 .proc_handler = proc_dointvec, 6758 }, 6759 #endif 6760 { 6761 .procname = "disable_ipv6", 6762 .data = &ipv6_devconf.disable_ipv6, 6763 .maxlen = sizeof(int), 6764 .mode = 0644, 6765 .proc_handler = addrconf_sysctl_disable, 6766 }, 6767 { 6768 .procname = "accept_dad", 6769 .data = &ipv6_devconf.accept_dad, 6770 .maxlen = sizeof(int), 6771 .mode = 0644, 6772 .proc_handler = proc_dointvec, 6773 }, 6774 { 6775 .procname = "force_tllao", 6776 .data = &ipv6_devconf.force_tllao, 6777 .maxlen = sizeof(int), 6778 .mode = 0644, 6779 .proc_handler = proc_dointvec 6780 }, 6781 { 6782 .procname = "ndisc_notify", 6783 .data = &ipv6_devconf.ndisc_notify, 6784 .maxlen = sizeof(int), 6785 .mode = 0644, 6786 .proc_handler = proc_dointvec 6787 }, 6788 { 6789 .procname = "suppress_frag_ndisc", 6790 .data = &ipv6_devconf.suppress_frag_ndisc, 6791 .maxlen = sizeof(int), 6792 .mode = 0644, 6793 .proc_handler = proc_dointvec 6794 }, 6795 { 6796 .procname = "accept_ra_from_local", 6797 .data = &ipv6_devconf.accept_ra_from_local, 6798 .maxlen = sizeof(int), 6799 .mode = 0644, 6800 .proc_handler = proc_dointvec, 6801 }, 6802 { 6803 .procname = "accept_ra_mtu", 6804 .data = &ipv6_devconf.accept_ra_mtu, 6805 .maxlen = sizeof(int), 6806 .mode = 0644, 6807 .proc_handler = proc_dointvec, 6808 }, 6809 { 6810 .procname = "stable_secret", 6811 .data = &ipv6_devconf.stable_secret, 6812 .maxlen = IPV6_MAX_STRLEN, 6813 .mode = 0600, 6814 .proc_handler = addrconf_sysctl_stable_secret, 6815 }, 6816 { 6817 .procname = "use_oif_addrs_only", 6818 .data = &ipv6_devconf.use_oif_addrs_only, 6819 .maxlen = sizeof(int), 6820 .mode = 0644, 6821 .proc_handler = proc_dointvec, 6822 }, 6823 { 6824 .procname = "ignore_routes_with_linkdown", 6825 .data = &ipv6_devconf.ignore_routes_with_linkdown, 6826 .maxlen = sizeof(int), 6827 .mode = 0644, 6828 .proc_handler = addrconf_sysctl_ignore_routes_with_linkdown, 6829 }, 6830 { 6831 .procname = "drop_unicast_in_l2_multicast", 6832 .data = &ipv6_devconf.drop_unicast_in_l2_multicast, 6833 .maxlen = sizeof(int), 6834 .mode = 0644, 6835 .proc_handler = proc_dointvec, 6836 }, 6837 { 6838 .procname = "drop_unsolicited_na", 6839 .data = &ipv6_devconf.drop_unsolicited_na, 6840 .maxlen = sizeof(int), 6841 .mode = 0644, 6842 .proc_handler = proc_dointvec, 6843 }, 6844 { 6845 .procname = "keep_addr_on_down", 6846 .data = &ipv6_devconf.keep_addr_on_down, 6847 .maxlen = sizeof(int), 6848 .mode = 0644, 6849 .proc_handler = proc_dointvec, 6850 6851 }, 6852 { 6853 .procname = "seg6_enabled", 6854 .data = &ipv6_devconf.seg6_enabled, 6855 .maxlen = sizeof(int), 6856 .mode = 0644, 6857 .proc_handler = proc_dointvec, 6858 }, 6859 #ifdef CONFIG_IPV6_SEG6_HMAC 6860 { 6861 .procname = "seg6_require_hmac", 6862 .data = &ipv6_devconf.seg6_require_hmac, 6863 .maxlen = sizeof(int), 6864 .mode = 0644, 6865 .proc_handler = proc_dointvec, 6866 }, 6867 #endif 6868 { 6869 .procname = "enhanced_dad", 6870 .data = &ipv6_devconf.enhanced_dad, 6871 .maxlen = sizeof(int), 6872 .mode = 0644, 6873 .proc_handler = proc_dointvec, 6874 }, 6875 { 6876 .procname = "addr_gen_mode", 6877 .data = &ipv6_devconf.addr_gen_mode, 6878 .maxlen = sizeof(int), 6879 .mode = 0644, 6880 .proc_handler = addrconf_sysctl_addr_gen_mode, 6881 }, 6882 { 6883 .procname = "disable_policy", 6884 .data = &ipv6_devconf.disable_policy, 6885 .maxlen = sizeof(int), 6886 .mode = 0644, 6887 .proc_handler = addrconf_sysctl_disable_policy, 6888 }, 6889 { 6890 .procname = "ndisc_tclass", 6891 .data = &ipv6_devconf.ndisc_tclass, 6892 .maxlen = sizeof(int), 6893 .mode = 0644, 6894 .proc_handler = proc_dointvec_minmax, 6895 .extra1 = (void *)SYSCTL_ZERO, 6896 .extra2 = (void *)&two_five_five, 6897 }, 6898 { 6899 .procname = "rpl_seg_enabled", 6900 .data = &ipv6_devconf.rpl_seg_enabled, 6901 .maxlen = sizeof(int), 6902 .mode = 0644, 6903 .proc_handler = proc_dointvec, 6904 }, 6905 { 6906 /* sentinel */ 6907 } 6908 }; 6909 6910 static int __addrconf_sysctl_register(struct net *net, char *dev_name, 6911 struct inet6_dev *idev, struct ipv6_devconf *p) 6912 { 6913 int i, ifindex; 6914 struct ctl_table *table; 6915 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ]; 6916 6917 table = kmemdup(addrconf_sysctl, sizeof(addrconf_sysctl), GFP_KERNEL); 6918 if (!table) 6919 goto out; 6920 6921 for (i = 0; table[i].data; i++) { 6922 table[i].data += (char *)p - (char *)&ipv6_devconf; 6923 /* If one of these is already set, then it is not safe to 6924 * overwrite either of them: this makes proc_dointvec_minmax 6925 * usable. 6926 */ 6927 if (!table[i].extra1 && !table[i].extra2) { 6928 table[i].extra1 = idev; /* embedded; no ref */ 6929 table[i].extra2 = net; 6930 } 6931 } 6932 6933 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name); 6934 6935 p->sysctl_header = register_net_sysctl(net, path, table); 6936 if (!p->sysctl_header) 6937 goto free; 6938 6939 if (!strcmp(dev_name, "all")) 6940 ifindex = NETCONFA_IFINDEX_ALL; 6941 else if (!strcmp(dev_name, "default")) 6942 ifindex = NETCONFA_IFINDEX_DEFAULT; 6943 else 6944 ifindex = idev->dev->ifindex; 6945 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, NETCONFA_ALL, 6946 ifindex, p); 6947 return 0; 6948 6949 free: 6950 kfree(table); 6951 out: 6952 return -ENOBUFS; 6953 } 6954 6955 static void __addrconf_sysctl_unregister(struct net *net, 6956 struct ipv6_devconf *p, int ifindex) 6957 { 6958 struct ctl_table *table; 6959 6960 if (!p->sysctl_header) 6961 return; 6962 6963 table = p->sysctl_header->ctl_table_arg; 6964 unregister_net_sysctl_table(p->sysctl_header); 6965 p->sysctl_header = NULL; 6966 kfree(table); 6967 6968 inet6_netconf_notify_devconf(net, RTM_DELNETCONF, 0, ifindex, NULL); 6969 } 6970 6971 static int addrconf_sysctl_register(struct inet6_dev *idev) 6972 { 6973 int err; 6974 6975 if (!sysctl_dev_name_is_allowed(idev->dev->name)) 6976 return -EINVAL; 6977 6978 err = neigh_sysctl_register(idev->dev, idev->nd_parms, 6979 &ndisc_ifinfo_sysctl_change); 6980 if (err) 6981 return err; 6982 err = __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name, 6983 idev, &idev->cnf); 6984 if (err) 6985 neigh_sysctl_unregister(idev->nd_parms); 6986 6987 return err; 6988 } 6989 6990 static void addrconf_sysctl_unregister(struct inet6_dev *idev) 6991 { 6992 __addrconf_sysctl_unregister(dev_net(idev->dev), &idev->cnf, 6993 idev->dev->ifindex); 6994 neigh_sysctl_unregister(idev->nd_parms); 6995 } 6996 6997 6998 #endif 6999 7000 static int __net_init addrconf_init_net(struct net *net) 7001 { 7002 int err = -ENOMEM; 7003 struct ipv6_devconf *all, *dflt; 7004 7005 all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL); 7006 if (!all) 7007 goto err_alloc_all; 7008 7009 dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL); 7010 if (!dflt) 7011 goto err_alloc_dflt; 7012 7013 if (IS_ENABLED(CONFIG_SYSCTL) && 7014 sysctl_devconf_inherit_init_net == 1 && !net_eq(net, &init_net)) { 7015 memcpy(all, init_net.ipv6.devconf_all, sizeof(ipv6_devconf)); 7016 memcpy(dflt, init_net.ipv6.devconf_dflt, sizeof(ipv6_devconf_dflt)); 7017 } 7018 7019 /* these will be inherited by all namespaces */ 7020 dflt->autoconf = ipv6_defaults.autoconf; 7021 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6; 7022 7023 dflt->stable_secret.initialized = false; 7024 all->stable_secret.initialized = false; 7025 7026 net->ipv6.devconf_all = all; 7027 net->ipv6.devconf_dflt = dflt; 7028 7029 #ifdef CONFIG_SYSCTL 7030 err = __addrconf_sysctl_register(net, "all", NULL, all); 7031 if (err < 0) 7032 goto err_reg_all; 7033 7034 err = __addrconf_sysctl_register(net, "default", NULL, dflt); 7035 if (err < 0) 7036 goto err_reg_dflt; 7037 #endif 7038 return 0; 7039 7040 #ifdef CONFIG_SYSCTL 7041 err_reg_dflt: 7042 __addrconf_sysctl_unregister(net, all, NETCONFA_IFINDEX_ALL); 7043 err_reg_all: 7044 kfree(dflt); 7045 #endif 7046 err_alloc_dflt: 7047 kfree(all); 7048 err_alloc_all: 7049 return err; 7050 } 7051 7052 static void __net_exit addrconf_exit_net(struct net *net) 7053 { 7054 #ifdef CONFIG_SYSCTL 7055 __addrconf_sysctl_unregister(net, net->ipv6.devconf_dflt, 7056 NETCONFA_IFINDEX_DEFAULT); 7057 __addrconf_sysctl_unregister(net, net->ipv6.devconf_all, 7058 NETCONFA_IFINDEX_ALL); 7059 #endif 7060 kfree(net->ipv6.devconf_dflt); 7061 kfree(net->ipv6.devconf_all); 7062 } 7063 7064 static struct pernet_operations addrconf_ops = { 7065 .init = addrconf_init_net, 7066 .exit = addrconf_exit_net, 7067 }; 7068 7069 static struct rtnl_af_ops inet6_ops __read_mostly = { 7070 .family = AF_INET6, 7071 .fill_link_af = inet6_fill_link_af, 7072 .get_link_af_size = inet6_get_link_af_size, 7073 .validate_link_af = inet6_validate_link_af, 7074 .set_link_af = inet6_set_link_af, 7075 }; 7076 7077 /* 7078 * Init / cleanup code 7079 */ 7080 7081 int __init addrconf_init(void) 7082 { 7083 struct inet6_dev *idev; 7084 int i, err; 7085 7086 err = ipv6_addr_label_init(); 7087 if (err < 0) { 7088 pr_crit("%s: cannot initialize default policy table: %d\n", 7089 __func__, err); 7090 goto out; 7091 } 7092 7093 err = register_pernet_subsys(&addrconf_ops); 7094 if (err < 0) 7095 goto out_addrlabel; 7096 7097 addrconf_wq = create_workqueue("ipv6_addrconf"); 7098 if (!addrconf_wq) { 7099 err = -ENOMEM; 7100 goto out_nowq; 7101 } 7102 7103 /* The addrconf netdev notifier requires that loopback_dev 7104 * has it's ipv6 private information allocated and setup 7105 * before it can bring up and give link-local addresses 7106 * to other devices which are up. 7107 * 7108 * Unfortunately, loopback_dev is not necessarily the first 7109 * entry in the global dev_base list of net devices. In fact, 7110 * it is likely to be the very last entry on that list. 7111 * So this causes the notifier registry below to try and 7112 * give link-local addresses to all devices besides loopback_dev 7113 * first, then loopback_dev, which cases all the non-loopback_dev 7114 * devices to fail to get a link-local address. 7115 * 7116 * So, as a temporary fix, allocate the ipv6 structure for 7117 * loopback_dev first by hand. 7118 * Longer term, all of the dependencies ipv6 has upon the loopback 7119 * device and it being up should be removed. 7120 */ 7121 rtnl_lock(); 7122 idev = ipv6_add_dev(init_net.loopback_dev); 7123 rtnl_unlock(); 7124 if (IS_ERR(idev)) { 7125 err = PTR_ERR(idev); 7126 goto errlo; 7127 } 7128 7129 ip6_route_init_special_entries(); 7130 7131 for (i = 0; i < IN6_ADDR_HSIZE; i++) 7132 INIT_HLIST_HEAD(&inet6_addr_lst[i]); 7133 7134 register_netdevice_notifier(&ipv6_dev_notf); 7135 7136 addrconf_verify(); 7137 7138 rtnl_af_register(&inet6_ops); 7139 7140 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETLINK, 7141 NULL, inet6_dump_ifinfo, 0); 7142 if (err < 0) 7143 goto errout; 7144 7145 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_NEWADDR, 7146 inet6_rtm_newaddr, NULL, 0); 7147 if (err < 0) 7148 goto errout; 7149 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_DELADDR, 7150 inet6_rtm_deladdr, NULL, 0); 7151 if (err < 0) 7152 goto errout; 7153 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETADDR, 7154 inet6_rtm_getaddr, inet6_dump_ifaddr, 7155 RTNL_FLAG_DOIT_UNLOCKED); 7156 if (err < 0) 7157 goto errout; 7158 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETMULTICAST, 7159 NULL, inet6_dump_ifmcaddr, 0); 7160 if (err < 0) 7161 goto errout; 7162 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETANYCAST, 7163 NULL, inet6_dump_ifacaddr, 0); 7164 if (err < 0) 7165 goto errout; 7166 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETNETCONF, 7167 inet6_netconf_get_devconf, 7168 inet6_netconf_dump_devconf, 7169 RTNL_FLAG_DOIT_UNLOCKED); 7170 if (err < 0) 7171 goto errout; 7172 err = ipv6_addr_label_rtnl_register(); 7173 if (err < 0) 7174 goto errout; 7175 7176 return 0; 7177 errout: 7178 rtnl_unregister_all(PF_INET6); 7179 rtnl_af_unregister(&inet6_ops); 7180 unregister_netdevice_notifier(&ipv6_dev_notf); 7181 errlo: 7182 destroy_workqueue(addrconf_wq); 7183 out_nowq: 7184 unregister_pernet_subsys(&addrconf_ops); 7185 out_addrlabel: 7186 ipv6_addr_label_cleanup(); 7187 out: 7188 return err; 7189 } 7190 7191 void addrconf_cleanup(void) 7192 { 7193 struct net_device *dev; 7194 int i; 7195 7196 unregister_netdevice_notifier(&ipv6_dev_notf); 7197 unregister_pernet_subsys(&addrconf_ops); 7198 ipv6_addr_label_cleanup(); 7199 7200 rtnl_af_unregister(&inet6_ops); 7201 7202 rtnl_lock(); 7203 7204 /* clean dev list */ 7205 for_each_netdev(&init_net, dev) { 7206 if (__in6_dev_get(dev) == NULL) 7207 continue; 7208 addrconf_ifdown(dev, 1); 7209 } 7210 addrconf_ifdown(init_net.loopback_dev, 2); 7211 7212 /* 7213 * Check hash table. 7214 */ 7215 spin_lock_bh(&addrconf_hash_lock); 7216 for (i = 0; i < IN6_ADDR_HSIZE; i++) 7217 WARN_ON(!hlist_empty(&inet6_addr_lst[i])); 7218 spin_unlock_bh(&addrconf_hash_lock); 7219 cancel_delayed_work(&addr_chk_work); 7220 rtnl_unlock(); 7221 7222 destroy_workqueue(addrconf_wq); 7223 } 7224