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 #include <linux/ioam6.h> 93 94 #define INFINITY_LIFE_TIME 0xFFFFFFFF 95 96 #define IPV6_MAX_STRLEN \ 97 sizeof("ffff:ffff:ffff:ffff:ffff:ffff:255.255.255.255") 98 99 static inline u32 cstamp_delta(unsigned long cstamp) 100 { 101 return (cstamp - INITIAL_JIFFIES) * 100UL / HZ; 102 } 103 104 static inline s32 rfc3315_s14_backoff_init(s32 irt) 105 { 106 /* multiply 'initial retransmission time' by 0.9 .. 1.1 */ 107 u64 tmp = get_random_u32_inclusive(900000, 1100000) * (u64)irt; 108 do_div(tmp, 1000000); 109 return (s32)tmp; 110 } 111 112 static inline s32 rfc3315_s14_backoff_update(s32 rt, s32 mrt) 113 { 114 /* multiply 'retransmission timeout' by 1.9 .. 2.1 */ 115 u64 tmp = get_random_u32_inclusive(1900000, 2100000) * (u64)rt; 116 do_div(tmp, 1000000); 117 if ((s32)tmp > mrt) { 118 /* multiply 'maximum retransmission time' by 0.9 .. 1.1 */ 119 tmp = get_random_u32_inclusive(900000, 1100000) * (u64)mrt; 120 do_div(tmp, 1000000); 121 } 122 return (s32)tmp; 123 } 124 125 #ifdef CONFIG_SYSCTL 126 static int addrconf_sysctl_register(struct inet6_dev *idev); 127 static void addrconf_sysctl_unregister(struct inet6_dev *idev); 128 #else 129 static inline int addrconf_sysctl_register(struct inet6_dev *idev) 130 { 131 return 0; 132 } 133 134 static inline void addrconf_sysctl_unregister(struct inet6_dev *idev) 135 { 136 } 137 #endif 138 139 static void ipv6_gen_rnd_iid(struct in6_addr *addr); 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 static void addrconf_verify(struct net *net); 151 static void addrconf_verify_rtnl(struct net *net); 152 153 static struct workqueue_struct *addrconf_wq; 154 155 static void addrconf_join_anycast(struct inet6_ifaddr *ifp); 156 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp); 157 158 static void addrconf_type_change(struct net_device *dev, 159 unsigned long event); 160 static int addrconf_ifdown(struct net_device *dev, bool unregister); 161 162 static struct fib6_info *addrconf_get_prefix_route(const struct in6_addr *pfx, 163 int plen, 164 const struct net_device *dev, 165 u32 flags, u32 noflags, 166 bool no_gw); 167 168 static void addrconf_dad_start(struct inet6_ifaddr *ifp); 169 static void addrconf_dad_work(struct work_struct *w); 170 static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id, 171 bool send_na); 172 static void addrconf_dad_run(struct inet6_dev *idev, bool restart); 173 static void addrconf_rs_timer(struct timer_list *t); 174 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa); 175 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa); 176 177 static void inet6_prefix_notify(int event, struct inet6_dev *idev, 178 struct prefix_info *pinfo); 179 180 static struct ipv6_devconf ipv6_devconf __read_mostly = { 181 .forwarding = 0, 182 .hop_limit = IPV6_DEFAULT_HOPLIMIT, 183 .mtu6 = IPV6_MIN_MTU, 184 .accept_ra = 1, 185 .accept_redirects = 1, 186 .autoconf = 1, 187 .force_mld_version = 0, 188 .mldv1_unsolicited_report_interval = 10 * HZ, 189 .mldv2_unsolicited_report_interval = HZ, 190 .dad_transmits = 1, 191 .rtr_solicits = MAX_RTR_SOLICITATIONS, 192 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL, 193 .rtr_solicit_max_interval = RTR_SOLICITATION_MAX_INTERVAL, 194 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY, 195 .use_tempaddr = 0, 196 .temp_valid_lft = TEMP_VALID_LIFETIME, 197 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME, 198 .regen_max_retry = REGEN_MAX_RETRY, 199 .max_desync_factor = MAX_DESYNC_FACTOR, 200 .max_addresses = IPV6_MAX_ADDRESSES, 201 .accept_ra_defrtr = 1, 202 .ra_defrtr_metric = IP6_RT_PRIO_USER, 203 .accept_ra_from_local = 0, 204 .accept_ra_min_hop_limit= 1, 205 .accept_ra_min_rtr_lft = 0, 206 .accept_ra_pinfo = 1, 207 #ifdef CONFIG_IPV6_ROUTER_PREF 208 .accept_ra_rtr_pref = 1, 209 .rtr_probe_interval = 60 * HZ, 210 #ifdef CONFIG_IPV6_ROUTE_INFO 211 .accept_ra_rt_info_min_plen = 0, 212 .accept_ra_rt_info_max_plen = 0, 213 #endif 214 #endif 215 .proxy_ndp = 0, 216 .accept_source_route = 0, /* we do not accept RH0 by default. */ 217 .disable_ipv6 = 0, 218 .accept_dad = 0, 219 .suppress_frag_ndisc = 1, 220 .accept_ra_mtu = 1, 221 .stable_secret = { 222 .initialized = false, 223 }, 224 .use_oif_addrs_only = 0, 225 .ignore_routes_with_linkdown = 0, 226 .keep_addr_on_down = 0, 227 .seg6_enabled = 0, 228 #ifdef CONFIG_IPV6_SEG6_HMAC 229 .seg6_require_hmac = 0, 230 #endif 231 .enhanced_dad = 1, 232 .addr_gen_mode = IN6_ADDR_GEN_MODE_EUI64, 233 .disable_policy = 0, 234 .rpl_seg_enabled = 0, 235 .ioam6_enabled = 0, 236 .ioam6_id = IOAM6_DEFAULT_IF_ID, 237 .ioam6_id_wide = IOAM6_DEFAULT_IF_ID_WIDE, 238 .ndisc_evict_nocarrier = 1, 239 }; 240 241 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = { 242 .forwarding = 0, 243 .hop_limit = IPV6_DEFAULT_HOPLIMIT, 244 .mtu6 = IPV6_MIN_MTU, 245 .accept_ra = 1, 246 .accept_redirects = 1, 247 .autoconf = 1, 248 .force_mld_version = 0, 249 .mldv1_unsolicited_report_interval = 10 * HZ, 250 .mldv2_unsolicited_report_interval = HZ, 251 .dad_transmits = 1, 252 .rtr_solicits = MAX_RTR_SOLICITATIONS, 253 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL, 254 .rtr_solicit_max_interval = RTR_SOLICITATION_MAX_INTERVAL, 255 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY, 256 .use_tempaddr = 0, 257 .temp_valid_lft = TEMP_VALID_LIFETIME, 258 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME, 259 .regen_max_retry = REGEN_MAX_RETRY, 260 .max_desync_factor = MAX_DESYNC_FACTOR, 261 .max_addresses = IPV6_MAX_ADDRESSES, 262 .accept_ra_defrtr = 1, 263 .ra_defrtr_metric = IP6_RT_PRIO_USER, 264 .accept_ra_from_local = 0, 265 .accept_ra_min_hop_limit= 1, 266 .accept_ra_min_rtr_lft = 0, 267 .accept_ra_pinfo = 1, 268 #ifdef CONFIG_IPV6_ROUTER_PREF 269 .accept_ra_rtr_pref = 1, 270 .rtr_probe_interval = 60 * HZ, 271 #ifdef CONFIG_IPV6_ROUTE_INFO 272 .accept_ra_rt_info_min_plen = 0, 273 .accept_ra_rt_info_max_plen = 0, 274 #endif 275 #endif 276 .proxy_ndp = 0, 277 .accept_source_route = 0, /* we do not accept RH0 by default. */ 278 .disable_ipv6 = 0, 279 .accept_dad = 1, 280 .suppress_frag_ndisc = 1, 281 .accept_ra_mtu = 1, 282 .stable_secret = { 283 .initialized = false, 284 }, 285 .use_oif_addrs_only = 0, 286 .ignore_routes_with_linkdown = 0, 287 .keep_addr_on_down = 0, 288 .seg6_enabled = 0, 289 #ifdef CONFIG_IPV6_SEG6_HMAC 290 .seg6_require_hmac = 0, 291 #endif 292 .enhanced_dad = 1, 293 .addr_gen_mode = IN6_ADDR_GEN_MODE_EUI64, 294 .disable_policy = 0, 295 .rpl_seg_enabled = 0, 296 .ioam6_enabled = 0, 297 .ioam6_id = IOAM6_DEFAULT_IF_ID, 298 .ioam6_id_wide = IOAM6_DEFAULT_IF_ID_WIDE, 299 .ndisc_evict_nocarrier = 1, 300 }; 301 302 /* Check if link is ready: is it up and is a valid qdisc available */ 303 static inline bool addrconf_link_ready(const struct net_device *dev) 304 { 305 return netif_oper_up(dev) && !qdisc_tx_is_noop(dev); 306 } 307 308 static void addrconf_del_rs_timer(struct inet6_dev *idev) 309 { 310 if (del_timer(&idev->rs_timer)) 311 __in6_dev_put(idev); 312 } 313 314 static void addrconf_del_dad_work(struct inet6_ifaddr *ifp) 315 { 316 if (cancel_delayed_work(&ifp->dad_work)) 317 __in6_ifa_put(ifp); 318 } 319 320 static void addrconf_mod_rs_timer(struct inet6_dev *idev, 321 unsigned long when) 322 { 323 if (!mod_timer(&idev->rs_timer, jiffies + when)) 324 in6_dev_hold(idev); 325 } 326 327 static void addrconf_mod_dad_work(struct inet6_ifaddr *ifp, 328 unsigned long delay) 329 { 330 in6_ifa_hold(ifp); 331 if (mod_delayed_work(addrconf_wq, &ifp->dad_work, delay)) 332 in6_ifa_put(ifp); 333 } 334 335 static int snmp6_alloc_dev(struct inet6_dev *idev) 336 { 337 int i; 338 339 idev->stats.ipv6 = alloc_percpu_gfp(struct ipstats_mib, GFP_KERNEL_ACCOUNT); 340 if (!idev->stats.ipv6) 341 goto err_ip; 342 343 for_each_possible_cpu(i) { 344 struct ipstats_mib *addrconf_stats; 345 addrconf_stats = per_cpu_ptr(idev->stats.ipv6, i); 346 u64_stats_init(&addrconf_stats->syncp); 347 } 348 349 350 idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device), 351 GFP_KERNEL); 352 if (!idev->stats.icmpv6dev) 353 goto err_icmp; 354 idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device), 355 GFP_KERNEL_ACCOUNT); 356 if (!idev->stats.icmpv6msgdev) 357 goto err_icmpmsg; 358 359 return 0; 360 361 err_icmpmsg: 362 kfree(idev->stats.icmpv6dev); 363 err_icmp: 364 free_percpu(idev->stats.ipv6); 365 err_ip: 366 return -ENOMEM; 367 } 368 369 static struct inet6_dev *ipv6_add_dev(struct net_device *dev) 370 { 371 struct inet6_dev *ndev; 372 int err = -ENOMEM; 373 374 ASSERT_RTNL(); 375 376 if (dev->mtu < IPV6_MIN_MTU && dev != blackhole_netdev) 377 return ERR_PTR(-EINVAL); 378 379 ndev = kzalloc(sizeof(*ndev), GFP_KERNEL_ACCOUNT); 380 if (!ndev) 381 return ERR_PTR(err); 382 383 rwlock_init(&ndev->lock); 384 ndev->dev = dev; 385 INIT_LIST_HEAD(&ndev->addr_list); 386 timer_setup(&ndev->rs_timer, addrconf_rs_timer, 0); 387 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf)); 388 389 if (ndev->cnf.stable_secret.initialized) 390 ndev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY; 391 392 ndev->cnf.mtu6 = dev->mtu; 393 ndev->ra_mtu = 0; 394 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl); 395 if (!ndev->nd_parms) { 396 kfree(ndev); 397 return ERR_PTR(err); 398 } 399 if (ndev->cnf.forwarding) 400 dev_disable_lro(dev); 401 /* We refer to the device */ 402 netdev_hold(dev, &ndev->dev_tracker, GFP_KERNEL); 403 404 if (snmp6_alloc_dev(ndev) < 0) { 405 netdev_dbg(dev, "%s: cannot allocate memory for statistics\n", 406 __func__); 407 neigh_parms_release(&nd_tbl, ndev->nd_parms); 408 netdev_put(dev, &ndev->dev_tracker); 409 kfree(ndev); 410 return ERR_PTR(err); 411 } 412 413 if (dev != blackhole_netdev) { 414 if (snmp6_register_dev(ndev) < 0) { 415 netdev_dbg(dev, "%s: cannot create /proc/net/dev_snmp6/%s\n", 416 __func__, dev->name); 417 goto err_release; 418 } 419 } 420 /* One reference from device. */ 421 refcount_set(&ndev->refcnt, 1); 422 423 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK)) 424 ndev->cnf.accept_dad = -1; 425 426 #if IS_ENABLED(CONFIG_IPV6_SIT) 427 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) { 428 pr_info("%s: Disabled Multicast RS\n", dev->name); 429 ndev->cnf.rtr_solicits = 0; 430 } 431 #endif 432 433 INIT_LIST_HEAD(&ndev->tempaddr_list); 434 ndev->desync_factor = U32_MAX; 435 if ((dev->flags&IFF_LOOPBACK) || 436 dev->type == ARPHRD_TUNNEL || 437 dev->type == ARPHRD_TUNNEL6 || 438 dev->type == ARPHRD_SIT || 439 dev->type == ARPHRD_NONE) { 440 ndev->cnf.use_tempaddr = -1; 441 } 442 443 ndev->token = in6addr_any; 444 445 if (netif_running(dev) && addrconf_link_ready(dev)) 446 ndev->if_flags |= IF_READY; 447 448 ipv6_mc_init_dev(ndev); 449 ndev->tstamp = jiffies; 450 if (dev != blackhole_netdev) { 451 err = addrconf_sysctl_register(ndev); 452 if (err) { 453 ipv6_mc_destroy_dev(ndev); 454 snmp6_unregister_dev(ndev); 455 goto err_release; 456 } 457 } 458 /* protected by rtnl_lock */ 459 rcu_assign_pointer(dev->ip6_ptr, ndev); 460 461 if (dev != blackhole_netdev) { 462 /* Join interface-local all-node multicast group */ 463 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allnodes); 464 465 /* Join all-node multicast group */ 466 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes); 467 468 /* Join all-router multicast group if forwarding is set */ 469 if (ndev->cnf.forwarding && (dev->flags & IFF_MULTICAST)) 470 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters); 471 } 472 return ndev; 473 474 err_release: 475 neigh_parms_release(&nd_tbl, ndev->nd_parms); 476 ndev->dead = 1; 477 in6_dev_finish_destroy(ndev); 478 return ERR_PTR(err); 479 } 480 481 static struct inet6_dev *ipv6_find_idev(struct net_device *dev) 482 { 483 struct inet6_dev *idev; 484 485 ASSERT_RTNL(); 486 487 idev = __in6_dev_get(dev); 488 if (!idev) { 489 idev = ipv6_add_dev(dev); 490 if (IS_ERR(idev)) 491 return idev; 492 } 493 494 if (dev->flags&IFF_UP) 495 ipv6_mc_up(idev); 496 return idev; 497 } 498 499 static int inet6_netconf_msgsize_devconf(int type) 500 { 501 int size = NLMSG_ALIGN(sizeof(struct netconfmsg)) 502 + nla_total_size(4); /* NETCONFA_IFINDEX */ 503 bool all = false; 504 505 if (type == NETCONFA_ALL) 506 all = true; 507 508 if (all || type == NETCONFA_FORWARDING) 509 size += nla_total_size(4); 510 #ifdef CONFIG_IPV6_MROUTE 511 if (all || type == NETCONFA_MC_FORWARDING) 512 size += nla_total_size(4); 513 #endif 514 if (all || type == NETCONFA_PROXY_NEIGH) 515 size += nla_total_size(4); 516 517 if (all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN) 518 size += nla_total_size(4); 519 520 return size; 521 } 522 523 static int inet6_netconf_fill_devconf(struct sk_buff *skb, int ifindex, 524 struct ipv6_devconf *devconf, u32 portid, 525 u32 seq, int event, unsigned int flags, 526 int type) 527 { 528 struct nlmsghdr *nlh; 529 struct netconfmsg *ncm; 530 bool all = false; 531 532 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg), 533 flags); 534 if (!nlh) 535 return -EMSGSIZE; 536 537 if (type == NETCONFA_ALL) 538 all = true; 539 540 ncm = nlmsg_data(nlh); 541 ncm->ncm_family = AF_INET6; 542 543 if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0) 544 goto nla_put_failure; 545 546 if (!devconf) 547 goto out; 548 549 if ((all || type == NETCONFA_FORWARDING) && 550 nla_put_s32(skb, NETCONFA_FORWARDING, devconf->forwarding) < 0) 551 goto nla_put_failure; 552 #ifdef CONFIG_IPV6_MROUTE 553 if ((all || type == NETCONFA_MC_FORWARDING) && 554 nla_put_s32(skb, NETCONFA_MC_FORWARDING, 555 atomic_read(&devconf->mc_forwarding)) < 0) 556 goto nla_put_failure; 557 #endif 558 if ((all || type == NETCONFA_PROXY_NEIGH) && 559 nla_put_s32(skb, NETCONFA_PROXY_NEIGH, devconf->proxy_ndp) < 0) 560 goto nla_put_failure; 561 562 if ((all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN) && 563 nla_put_s32(skb, NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN, 564 devconf->ignore_routes_with_linkdown) < 0) 565 goto nla_put_failure; 566 567 out: 568 nlmsg_end(skb, nlh); 569 return 0; 570 571 nla_put_failure: 572 nlmsg_cancel(skb, nlh); 573 return -EMSGSIZE; 574 } 575 576 void inet6_netconf_notify_devconf(struct net *net, int event, int type, 577 int ifindex, struct ipv6_devconf *devconf) 578 { 579 struct sk_buff *skb; 580 int err = -ENOBUFS; 581 582 skb = nlmsg_new(inet6_netconf_msgsize_devconf(type), GFP_KERNEL); 583 if (!skb) 584 goto errout; 585 586 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 0, 0, 587 event, 0, type); 588 if (err < 0) { 589 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */ 590 WARN_ON(err == -EMSGSIZE); 591 kfree_skb(skb); 592 goto errout; 593 } 594 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_NETCONF, NULL, GFP_KERNEL); 595 return; 596 errout: 597 rtnl_set_sk_err(net, RTNLGRP_IPV6_NETCONF, err); 598 } 599 600 static const struct nla_policy devconf_ipv6_policy[NETCONFA_MAX+1] = { 601 [NETCONFA_IFINDEX] = { .len = sizeof(int) }, 602 [NETCONFA_FORWARDING] = { .len = sizeof(int) }, 603 [NETCONFA_PROXY_NEIGH] = { .len = sizeof(int) }, 604 [NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN] = { .len = sizeof(int) }, 605 }; 606 607 static int inet6_netconf_valid_get_req(struct sk_buff *skb, 608 const struct nlmsghdr *nlh, 609 struct nlattr **tb, 610 struct netlink_ext_ack *extack) 611 { 612 int i, err; 613 614 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(struct netconfmsg))) { 615 NL_SET_ERR_MSG_MOD(extack, "Invalid header for netconf get request"); 616 return -EINVAL; 617 } 618 619 if (!netlink_strict_get_check(skb)) 620 return nlmsg_parse_deprecated(nlh, sizeof(struct netconfmsg), 621 tb, NETCONFA_MAX, 622 devconf_ipv6_policy, extack); 623 624 err = nlmsg_parse_deprecated_strict(nlh, sizeof(struct netconfmsg), 625 tb, NETCONFA_MAX, 626 devconf_ipv6_policy, extack); 627 if (err) 628 return err; 629 630 for (i = 0; i <= NETCONFA_MAX; i++) { 631 if (!tb[i]) 632 continue; 633 634 switch (i) { 635 case NETCONFA_IFINDEX: 636 break; 637 default: 638 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in netconf get request"); 639 return -EINVAL; 640 } 641 } 642 643 return 0; 644 } 645 646 static int inet6_netconf_get_devconf(struct sk_buff *in_skb, 647 struct nlmsghdr *nlh, 648 struct netlink_ext_ack *extack) 649 { 650 struct net *net = sock_net(in_skb->sk); 651 struct nlattr *tb[NETCONFA_MAX+1]; 652 struct inet6_dev *in6_dev = NULL; 653 struct net_device *dev = NULL; 654 struct sk_buff *skb; 655 struct ipv6_devconf *devconf; 656 int ifindex; 657 int err; 658 659 err = inet6_netconf_valid_get_req(in_skb, nlh, tb, extack); 660 if (err < 0) 661 return err; 662 663 if (!tb[NETCONFA_IFINDEX]) 664 return -EINVAL; 665 666 err = -EINVAL; 667 ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]); 668 switch (ifindex) { 669 case NETCONFA_IFINDEX_ALL: 670 devconf = net->ipv6.devconf_all; 671 break; 672 case NETCONFA_IFINDEX_DEFAULT: 673 devconf = net->ipv6.devconf_dflt; 674 break; 675 default: 676 dev = dev_get_by_index(net, ifindex); 677 if (!dev) 678 return -EINVAL; 679 in6_dev = in6_dev_get(dev); 680 if (!in6_dev) 681 goto errout; 682 devconf = &in6_dev->cnf; 683 break; 684 } 685 686 err = -ENOBUFS; 687 skb = nlmsg_new(inet6_netconf_msgsize_devconf(NETCONFA_ALL), GFP_KERNEL); 688 if (!skb) 689 goto errout; 690 691 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 692 NETLINK_CB(in_skb).portid, 693 nlh->nlmsg_seq, RTM_NEWNETCONF, 0, 694 NETCONFA_ALL); 695 if (err < 0) { 696 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */ 697 WARN_ON(err == -EMSGSIZE); 698 kfree_skb(skb); 699 goto errout; 700 } 701 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid); 702 errout: 703 if (in6_dev) 704 in6_dev_put(in6_dev); 705 dev_put(dev); 706 return err; 707 } 708 709 static int inet6_netconf_dump_devconf(struct sk_buff *skb, 710 struct netlink_callback *cb) 711 { 712 const struct nlmsghdr *nlh = cb->nlh; 713 struct net *net = sock_net(skb->sk); 714 int h, s_h; 715 int idx, s_idx; 716 struct net_device *dev; 717 struct inet6_dev *idev; 718 struct hlist_head *head; 719 720 if (cb->strict_check) { 721 struct netlink_ext_ack *extack = cb->extack; 722 struct netconfmsg *ncm; 723 724 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ncm))) { 725 NL_SET_ERR_MSG_MOD(extack, "Invalid header for netconf dump request"); 726 return -EINVAL; 727 } 728 729 if (nlmsg_attrlen(nlh, sizeof(*ncm))) { 730 NL_SET_ERR_MSG_MOD(extack, "Invalid data after header in netconf dump request"); 731 return -EINVAL; 732 } 733 } 734 735 s_h = cb->args[0]; 736 s_idx = idx = cb->args[1]; 737 738 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 739 idx = 0; 740 head = &net->dev_index_head[h]; 741 rcu_read_lock(); 742 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ 743 net->dev_base_seq; 744 hlist_for_each_entry_rcu(dev, head, index_hlist) { 745 if (idx < s_idx) 746 goto cont; 747 idev = __in6_dev_get(dev); 748 if (!idev) 749 goto cont; 750 751 if (inet6_netconf_fill_devconf(skb, dev->ifindex, 752 &idev->cnf, 753 NETLINK_CB(cb->skb).portid, 754 nlh->nlmsg_seq, 755 RTM_NEWNETCONF, 756 NLM_F_MULTI, 757 NETCONFA_ALL) < 0) { 758 rcu_read_unlock(); 759 goto done; 760 } 761 nl_dump_check_consistent(cb, nlmsg_hdr(skb)); 762 cont: 763 idx++; 764 } 765 rcu_read_unlock(); 766 } 767 if (h == NETDEV_HASHENTRIES) { 768 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL, 769 net->ipv6.devconf_all, 770 NETLINK_CB(cb->skb).portid, 771 nlh->nlmsg_seq, 772 RTM_NEWNETCONF, NLM_F_MULTI, 773 NETCONFA_ALL) < 0) 774 goto done; 775 else 776 h++; 777 } 778 if (h == NETDEV_HASHENTRIES + 1) { 779 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT, 780 net->ipv6.devconf_dflt, 781 NETLINK_CB(cb->skb).portid, 782 nlh->nlmsg_seq, 783 RTM_NEWNETCONF, NLM_F_MULTI, 784 NETCONFA_ALL) < 0) 785 goto done; 786 else 787 h++; 788 } 789 done: 790 cb->args[0] = h; 791 cb->args[1] = idx; 792 793 return skb->len; 794 } 795 796 #ifdef CONFIG_SYSCTL 797 static void dev_forward_change(struct inet6_dev *idev) 798 { 799 struct net_device *dev; 800 struct inet6_ifaddr *ifa; 801 LIST_HEAD(tmp_addr_list); 802 803 if (!idev) 804 return; 805 dev = idev->dev; 806 if (idev->cnf.forwarding) 807 dev_disable_lro(dev); 808 if (dev->flags & IFF_MULTICAST) { 809 if (idev->cnf.forwarding) { 810 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters); 811 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allrouters); 812 ipv6_dev_mc_inc(dev, &in6addr_sitelocal_allrouters); 813 } else { 814 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters); 815 ipv6_dev_mc_dec(dev, &in6addr_interfacelocal_allrouters); 816 ipv6_dev_mc_dec(dev, &in6addr_sitelocal_allrouters); 817 } 818 } 819 820 read_lock_bh(&idev->lock); 821 list_for_each_entry(ifa, &idev->addr_list, if_list) { 822 if (ifa->flags&IFA_F_TENTATIVE) 823 continue; 824 list_add_tail(&ifa->if_list_aux, &tmp_addr_list); 825 } 826 read_unlock_bh(&idev->lock); 827 828 while (!list_empty(&tmp_addr_list)) { 829 ifa = list_first_entry(&tmp_addr_list, 830 struct inet6_ifaddr, if_list_aux); 831 list_del(&ifa->if_list_aux); 832 if (idev->cnf.forwarding) 833 addrconf_join_anycast(ifa); 834 else 835 addrconf_leave_anycast(ifa); 836 } 837 838 inet6_netconf_notify_devconf(dev_net(dev), RTM_NEWNETCONF, 839 NETCONFA_FORWARDING, 840 dev->ifindex, &idev->cnf); 841 } 842 843 844 static void addrconf_forward_change(struct net *net, __s32 newf) 845 { 846 struct net_device *dev; 847 struct inet6_dev *idev; 848 849 for_each_netdev(net, dev) { 850 idev = __in6_dev_get(dev); 851 if (idev) { 852 int changed = (!idev->cnf.forwarding) ^ (!newf); 853 idev->cnf.forwarding = newf; 854 if (changed) 855 dev_forward_change(idev); 856 } 857 } 858 } 859 860 static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf) 861 { 862 struct net *net; 863 int old; 864 865 if (!rtnl_trylock()) 866 return restart_syscall(); 867 868 net = (struct net *)table->extra2; 869 old = *p; 870 *p = newf; 871 872 if (p == &net->ipv6.devconf_dflt->forwarding) { 873 if ((!newf) ^ (!old)) 874 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 875 NETCONFA_FORWARDING, 876 NETCONFA_IFINDEX_DEFAULT, 877 net->ipv6.devconf_dflt); 878 rtnl_unlock(); 879 return 0; 880 } 881 882 if (p == &net->ipv6.devconf_all->forwarding) { 883 int old_dflt = net->ipv6.devconf_dflt->forwarding; 884 885 net->ipv6.devconf_dflt->forwarding = newf; 886 if ((!newf) ^ (!old_dflt)) 887 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 888 NETCONFA_FORWARDING, 889 NETCONFA_IFINDEX_DEFAULT, 890 net->ipv6.devconf_dflt); 891 892 addrconf_forward_change(net, newf); 893 if ((!newf) ^ (!old)) 894 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 895 NETCONFA_FORWARDING, 896 NETCONFA_IFINDEX_ALL, 897 net->ipv6.devconf_all); 898 } else if ((!newf) ^ (!old)) 899 dev_forward_change((struct inet6_dev *)table->extra1); 900 rtnl_unlock(); 901 902 if (newf) 903 rt6_purge_dflt_routers(net); 904 return 1; 905 } 906 907 static void addrconf_linkdown_change(struct net *net, __s32 newf) 908 { 909 struct net_device *dev; 910 struct inet6_dev *idev; 911 912 for_each_netdev(net, dev) { 913 idev = __in6_dev_get(dev); 914 if (idev) { 915 int changed = (!idev->cnf.ignore_routes_with_linkdown) ^ (!newf); 916 917 idev->cnf.ignore_routes_with_linkdown = newf; 918 if (changed) 919 inet6_netconf_notify_devconf(dev_net(dev), 920 RTM_NEWNETCONF, 921 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN, 922 dev->ifindex, 923 &idev->cnf); 924 } 925 } 926 } 927 928 static int addrconf_fixup_linkdown(struct ctl_table *table, int *p, int newf) 929 { 930 struct net *net; 931 int old; 932 933 if (!rtnl_trylock()) 934 return restart_syscall(); 935 936 net = (struct net *)table->extra2; 937 old = *p; 938 *p = newf; 939 940 if (p == &net->ipv6.devconf_dflt->ignore_routes_with_linkdown) { 941 if ((!newf) ^ (!old)) 942 inet6_netconf_notify_devconf(net, 943 RTM_NEWNETCONF, 944 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN, 945 NETCONFA_IFINDEX_DEFAULT, 946 net->ipv6.devconf_dflt); 947 rtnl_unlock(); 948 return 0; 949 } 950 951 if (p == &net->ipv6.devconf_all->ignore_routes_with_linkdown) { 952 net->ipv6.devconf_dflt->ignore_routes_with_linkdown = newf; 953 addrconf_linkdown_change(net, newf); 954 if ((!newf) ^ (!old)) 955 inet6_netconf_notify_devconf(net, 956 RTM_NEWNETCONF, 957 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN, 958 NETCONFA_IFINDEX_ALL, 959 net->ipv6.devconf_all); 960 } 961 rtnl_unlock(); 962 963 return 1; 964 } 965 966 #endif 967 968 /* Nobody refers to this ifaddr, destroy it */ 969 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp) 970 { 971 WARN_ON(!hlist_unhashed(&ifp->addr_lst)); 972 973 #ifdef NET_REFCNT_DEBUG 974 pr_debug("%s\n", __func__); 975 #endif 976 977 in6_dev_put(ifp->idev); 978 979 if (cancel_delayed_work(&ifp->dad_work)) 980 pr_notice("delayed DAD work was pending while freeing ifa=%p\n", 981 ifp); 982 983 if (ifp->state != INET6_IFADDR_STATE_DEAD) { 984 pr_warn("Freeing alive inet6 address %p\n", ifp); 985 return; 986 } 987 988 kfree_rcu(ifp, rcu); 989 } 990 991 static void 992 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp) 993 { 994 struct list_head *p; 995 int ifp_scope = ipv6_addr_src_scope(&ifp->addr); 996 997 /* 998 * Each device address list is sorted in order of scope - 999 * global before linklocal. 1000 */ 1001 list_for_each(p, &idev->addr_list) { 1002 struct inet6_ifaddr *ifa 1003 = list_entry(p, struct inet6_ifaddr, if_list); 1004 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr)) 1005 break; 1006 } 1007 1008 list_add_tail_rcu(&ifp->if_list, p); 1009 } 1010 1011 static u32 inet6_addr_hash(const struct net *net, const struct in6_addr *addr) 1012 { 1013 u32 val = ipv6_addr_hash(addr) ^ net_hash_mix(net); 1014 1015 return hash_32(val, IN6_ADDR_HSIZE_SHIFT); 1016 } 1017 1018 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr, 1019 struct net_device *dev, unsigned int hash) 1020 { 1021 struct inet6_ifaddr *ifp; 1022 1023 hlist_for_each_entry(ifp, &net->ipv6.inet6_addr_lst[hash], addr_lst) { 1024 if (ipv6_addr_equal(&ifp->addr, addr)) { 1025 if (!dev || ifp->idev->dev == dev) 1026 return true; 1027 } 1028 } 1029 return false; 1030 } 1031 1032 static int ipv6_add_addr_hash(struct net_device *dev, struct inet6_ifaddr *ifa) 1033 { 1034 struct net *net = dev_net(dev); 1035 unsigned int hash = inet6_addr_hash(net, &ifa->addr); 1036 int err = 0; 1037 1038 spin_lock_bh(&net->ipv6.addrconf_hash_lock); 1039 1040 /* Ignore adding duplicate addresses on an interface */ 1041 if (ipv6_chk_same_addr(net, &ifa->addr, dev, hash)) { 1042 netdev_dbg(dev, "ipv6_add_addr: already assigned\n"); 1043 err = -EEXIST; 1044 } else { 1045 hlist_add_head_rcu(&ifa->addr_lst, &net->ipv6.inet6_addr_lst[hash]); 1046 } 1047 1048 spin_unlock_bh(&net->ipv6.addrconf_hash_lock); 1049 1050 return err; 1051 } 1052 1053 /* On success it returns ifp with increased reference count */ 1054 1055 static struct inet6_ifaddr * 1056 ipv6_add_addr(struct inet6_dev *idev, struct ifa6_config *cfg, 1057 bool can_block, struct netlink_ext_ack *extack) 1058 { 1059 gfp_t gfp_flags = can_block ? GFP_KERNEL : GFP_ATOMIC; 1060 int addr_type = ipv6_addr_type(cfg->pfx); 1061 struct net *net = dev_net(idev->dev); 1062 struct inet6_ifaddr *ifa = NULL; 1063 struct fib6_info *f6i = NULL; 1064 int err = 0; 1065 1066 if (addr_type == IPV6_ADDR_ANY || 1067 (addr_type & IPV6_ADDR_MULTICAST && 1068 !(cfg->ifa_flags & IFA_F_MCAUTOJOIN)) || 1069 (!(idev->dev->flags & IFF_LOOPBACK) && 1070 !netif_is_l3_master(idev->dev) && 1071 addr_type & IPV6_ADDR_LOOPBACK)) 1072 return ERR_PTR(-EADDRNOTAVAIL); 1073 1074 if (idev->dead) { 1075 err = -ENODEV; /*XXX*/ 1076 goto out; 1077 } 1078 1079 if (idev->cnf.disable_ipv6) { 1080 err = -EACCES; 1081 goto out; 1082 } 1083 1084 /* validator notifier needs to be blocking; 1085 * do not call in atomic context 1086 */ 1087 if (can_block) { 1088 struct in6_validator_info i6vi = { 1089 .i6vi_addr = *cfg->pfx, 1090 .i6vi_dev = idev, 1091 .extack = extack, 1092 }; 1093 1094 err = inet6addr_validator_notifier_call_chain(NETDEV_UP, &i6vi); 1095 err = notifier_to_errno(err); 1096 if (err < 0) 1097 goto out; 1098 } 1099 1100 ifa = kzalloc(sizeof(*ifa), gfp_flags | __GFP_ACCOUNT); 1101 if (!ifa) { 1102 err = -ENOBUFS; 1103 goto out; 1104 } 1105 1106 f6i = addrconf_f6i_alloc(net, idev, cfg->pfx, false, gfp_flags); 1107 if (IS_ERR(f6i)) { 1108 err = PTR_ERR(f6i); 1109 f6i = NULL; 1110 goto out; 1111 } 1112 1113 neigh_parms_data_state_setall(idev->nd_parms); 1114 1115 ifa->addr = *cfg->pfx; 1116 if (cfg->peer_pfx) 1117 ifa->peer_addr = *cfg->peer_pfx; 1118 1119 spin_lock_init(&ifa->lock); 1120 INIT_DELAYED_WORK(&ifa->dad_work, addrconf_dad_work); 1121 INIT_HLIST_NODE(&ifa->addr_lst); 1122 ifa->scope = cfg->scope; 1123 ifa->prefix_len = cfg->plen; 1124 ifa->rt_priority = cfg->rt_priority; 1125 ifa->flags = cfg->ifa_flags; 1126 ifa->ifa_proto = cfg->ifa_proto; 1127 /* No need to add the TENTATIVE flag for addresses with NODAD */ 1128 if (!(cfg->ifa_flags & IFA_F_NODAD)) 1129 ifa->flags |= IFA_F_TENTATIVE; 1130 ifa->valid_lft = cfg->valid_lft; 1131 ifa->prefered_lft = cfg->preferred_lft; 1132 ifa->cstamp = ifa->tstamp = jiffies; 1133 ifa->tokenized = false; 1134 1135 ifa->rt = f6i; 1136 1137 ifa->idev = idev; 1138 in6_dev_hold(idev); 1139 1140 /* For caller */ 1141 refcount_set(&ifa->refcnt, 1); 1142 1143 rcu_read_lock(); 1144 1145 err = ipv6_add_addr_hash(idev->dev, ifa); 1146 if (err < 0) { 1147 rcu_read_unlock(); 1148 goto out; 1149 } 1150 1151 write_lock_bh(&idev->lock); 1152 1153 /* Add to inet6_dev unicast addr list. */ 1154 ipv6_link_dev_addr(idev, ifa); 1155 1156 if (ifa->flags&IFA_F_TEMPORARY) { 1157 list_add(&ifa->tmp_list, &idev->tempaddr_list); 1158 in6_ifa_hold(ifa); 1159 } 1160 1161 in6_ifa_hold(ifa); 1162 write_unlock_bh(&idev->lock); 1163 1164 rcu_read_unlock(); 1165 1166 inet6addr_notifier_call_chain(NETDEV_UP, ifa); 1167 out: 1168 if (unlikely(err < 0)) { 1169 fib6_info_release(f6i); 1170 1171 if (ifa) { 1172 if (ifa->idev) 1173 in6_dev_put(ifa->idev); 1174 kfree(ifa); 1175 } 1176 ifa = ERR_PTR(err); 1177 } 1178 1179 return ifa; 1180 } 1181 1182 enum cleanup_prefix_rt_t { 1183 CLEANUP_PREFIX_RT_NOP, /* no cleanup action for prefix route */ 1184 CLEANUP_PREFIX_RT_DEL, /* delete the prefix route */ 1185 CLEANUP_PREFIX_RT_EXPIRE, /* update the lifetime of the prefix route */ 1186 }; 1187 1188 /* 1189 * Check, whether the prefix for ifp would still need a prefix route 1190 * after deleting ifp. The function returns one of the CLEANUP_PREFIX_RT_* 1191 * constants. 1192 * 1193 * 1) we don't purge prefix if address was not permanent. 1194 * prefix is managed by its own lifetime. 1195 * 2) we also don't purge, if the address was IFA_F_NOPREFIXROUTE. 1196 * 3) if there are no addresses, delete prefix. 1197 * 4) if there are still other permanent address(es), 1198 * corresponding prefix is still permanent. 1199 * 5) if there are still other addresses with IFA_F_NOPREFIXROUTE, 1200 * don't purge the prefix, assume user space is managing it. 1201 * 6) otherwise, update prefix lifetime to the 1202 * longest valid lifetime among the corresponding 1203 * addresses on the device. 1204 * Note: subsequent RA will update lifetime. 1205 **/ 1206 static enum cleanup_prefix_rt_t 1207 check_cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long *expires) 1208 { 1209 struct inet6_ifaddr *ifa; 1210 struct inet6_dev *idev = ifp->idev; 1211 unsigned long lifetime; 1212 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_DEL; 1213 1214 *expires = jiffies; 1215 1216 list_for_each_entry(ifa, &idev->addr_list, if_list) { 1217 if (ifa == ifp) 1218 continue; 1219 if (ifa->prefix_len != ifp->prefix_len || 1220 !ipv6_prefix_equal(&ifa->addr, &ifp->addr, 1221 ifp->prefix_len)) 1222 continue; 1223 if (ifa->flags & (IFA_F_PERMANENT | IFA_F_NOPREFIXROUTE)) 1224 return CLEANUP_PREFIX_RT_NOP; 1225 1226 action = CLEANUP_PREFIX_RT_EXPIRE; 1227 1228 spin_lock(&ifa->lock); 1229 1230 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ); 1231 /* 1232 * Note: Because this address is 1233 * not permanent, lifetime < 1234 * LONG_MAX / HZ here. 1235 */ 1236 if (time_before(*expires, ifa->tstamp + lifetime * HZ)) 1237 *expires = ifa->tstamp + lifetime * HZ; 1238 spin_unlock(&ifa->lock); 1239 } 1240 1241 return action; 1242 } 1243 1244 static void 1245 cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long expires, 1246 bool del_rt, bool del_peer) 1247 { 1248 struct fib6_info *f6i; 1249 1250 f6i = addrconf_get_prefix_route(del_peer ? &ifp->peer_addr : &ifp->addr, 1251 ifp->prefix_len, 1252 ifp->idev->dev, 0, RTF_DEFAULT, true); 1253 if (f6i) { 1254 if (del_rt) 1255 ip6_del_rt(dev_net(ifp->idev->dev), f6i, false); 1256 else { 1257 if (!(f6i->fib6_flags & RTF_EXPIRES)) 1258 fib6_set_expires(f6i, expires); 1259 fib6_info_release(f6i); 1260 } 1261 } 1262 } 1263 1264 1265 /* This function wants to get referenced ifp and releases it before return */ 1266 1267 static void ipv6_del_addr(struct inet6_ifaddr *ifp) 1268 { 1269 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_NOP; 1270 struct net *net = dev_net(ifp->idev->dev); 1271 unsigned long expires; 1272 int state; 1273 1274 ASSERT_RTNL(); 1275 1276 spin_lock_bh(&ifp->lock); 1277 state = ifp->state; 1278 ifp->state = INET6_IFADDR_STATE_DEAD; 1279 spin_unlock_bh(&ifp->lock); 1280 1281 if (state == INET6_IFADDR_STATE_DEAD) 1282 goto out; 1283 1284 spin_lock_bh(&net->ipv6.addrconf_hash_lock); 1285 hlist_del_init_rcu(&ifp->addr_lst); 1286 spin_unlock_bh(&net->ipv6.addrconf_hash_lock); 1287 1288 write_lock_bh(&ifp->idev->lock); 1289 1290 if (ifp->flags&IFA_F_TEMPORARY) { 1291 list_del(&ifp->tmp_list); 1292 if (ifp->ifpub) { 1293 in6_ifa_put(ifp->ifpub); 1294 ifp->ifpub = NULL; 1295 } 1296 __in6_ifa_put(ifp); 1297 } 1298 1299 if (ifp->flags & IFA_F_PERMANENT && !(ifp->flags & IFA_F_NOPREFIXROUTE)) 1300 action = check_cleanup_prefix_route(ifp, &expires); 1301 1302 list_del_rcu(&ifp->if_list); 1303 __in6_ifa_put(ifp); 1304 1305 write_unlock_bh(&ifp->idev->lock); 1306 1307 addrconf_del_dad_work(ifp); 1308 1309 ipv6_ifa_notify(RTM_DELADDR, ifp); 1310 1311 inet6addr_notifier_call_chain(NETDEV_DOWN, ifp); 1312 1313 if (action != CLEANUP_PREFIX_RT_NOP) { 1314 cleanup_prefix_route(ifp, expires, 1315 action == CLEANUP_PREFIX_RT_DEL, false); 1316 } 1317 1318 /* clean up prefsrc entries */ 1319 rt6_remove_prefsrc(ifp); 1320 out: 1321 in6_ifa_put(ifp); 1322 } 1323 1324 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, bool block) 1325 { 1326 struct inet6_dev *idev = ifp->idev; 1327 unsigned long tmp_tstamp, age; 1328 unsigned long regen_advance; 1329 unsigned long now = jiffies; 1330 s32 cnf_temp_preferred_lft; 1331 struct inet6_ifaddr *ift; 1332 struct ifa6_config cfg; 1333 long max_desync_factor; 1334 struct in6_addr addr; 1335 int ret = 0; 1336 1337 write_lock_bh(&idev->lock); 1338 1339 retry: 1340 in6_dev_hold(idev); 1341 if (idev->cnf.use_tempaddr <= 0) { 1342 write_unlock_bh(&idev->lock); 1343 pr_info("%s: use_tempaddr is disabled\n", __func__); 1344 in6_dev_put(idev); 1345 ret = -1; 1346 goto out; 1347 } 1348 spin_lock_bh(&ifp->lock); 1349 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) { 1350 idev->cnf.use_tempaddr = -1; /*XXX*/ 1351 spin_unlock_bh(&ifp->lock); 1352 write_unlock_bh(&idev->lock); 1353 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n", 1354 __func__); 1355 in6_dev_put(idev); 1356 ret = -1; 1357 goto out; 1358 } 1359 in6_ifa_hold(ifp); 1360 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8); 1361 ipv6_gen_rnd_iid(&addr); 1362 1363 age = (now - ifp->tstamp) / HZ; 1364 1365 regen_advance = idev->cnf.regen_max_retry * 1366 idev->cnf.dad_transmits * 1367 max(NEIGH_VAR(idev->nd_parms, RETRANS_TIME), HZ/100) / HZ; 1368 1369 /* recalculate max_desync_factor each time and update 1370 * idev->desync_factor if it's larger 1371 */ 1372 cnf_temp_preferred_lft = READ_ONCE(idev->cnf.temp_prefered_lft); 1373 max_desync_factor = min_t(__u32, 1374 idev->cnf.max_desync_factor, 1375 cnf_temp_preferred_lft - regen_advance); 1376 1377 if (unlikely(idev->desync_factor > max_desync_factor)) { 1378 if (max_desync_factor > 0) { 1379 get_random_bytes(&idev->desync_factor, 1380 sizeof(idev->desync_factor)); 1381 idev->desync_factor %= max_desync_factor; 1382 } else { 1383 idev->desync_factor = 0; 1384 } 1385 } 1386 1387 memset(&cfg, 0, sizeof(cfg)); 1388 cfg.valid_lft = min_t(__u32, ifp->valid_lft, 1389 idev->cnf.temp_valid_lft + age); 1390 cfg.preferred_lft = cnf_temp_preferred_lft + age - idev->desync_factor; 1391 cfg.preferred_lft = min_t(__u32, ifp->prefered_lft, cfg.preferred_lft); 1392 1393 cfg.plen = ifp->prefix_len; 1394 tmp_tstamp = ifp->tstamp; 1395 spin_unlock_bh(&ifp->lock); 1396 1397 write_unlock_bh(&idev->lock); 1398 1399 /* A temporary address is created only if this calculated Preferred 1400 * Lifetime is greater than REGEN_ADVANCE time units. In particular, 1401 * an implementation must not create a temporary address with a zero 1402 * Preferred Lifetime. 1403 * Use age calculation as in addrconf_verify to avoid unnecessary 1404 * temporary addresses being generated. 1405 */ 1406 age = (now - tmp_tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ; 1407 if (cfg.preferred_lft <= regen_advance + age) { 1408 in6_ifa_put(ifp); 1409 in6_dev_put(idev); 1410 ret = -1; 1411 goto out; 1412 } 1413 1414 cfg.ifa_flags = IFA_F_TEMPORARY; 1415 /* set in addrconf_prefix_rcv() */ 1416 if (ifp->flags & IFA_F_OPTIMISTIC) 1417 cfg.ifa_flags |= IFA_F_OPTIMISTIC; 1418 1419 cfg.pfx = &addr; 1420 cfg.scope = ipv6_addr_scope(cfg.pfx); 1421 1422 ift = ipv6_add_addr(idev, &cfg, block, NULL); 1423 if (IS_ERR(ift)) { 1424 in6_ifa_put(ifp); 1425 in6_dev_put(idev); 1426 pr_info("%s: retry temporary address regeneration\n", __func__); 1427 write_lock_bh(&idev->lock); 1428 goto retry; 1429 } 1430 1431 spin_lock_bh(&ift->lock); 1432 ift->ifpub = ifp; 1433 ift->cstamp = now; 1434 ift->tstamp = tmp_tstamp; 1435 spin_unlock_bh(&ift->lock); 1436 1437 addrconf_dad_start(ift); 1438 in6_ifa_put(ift); 1439 in6_dev_put(idev); 1440 out: 1441 return ret; 1442 } 1443 1444 /* 1445 * Choose an appropriate source address (RFC3484) 1446 */ 1447 enum { 1448 IPV6_SADDR_RULE_INIT = 0, 1449 IPV6_SADDR_RULE_LOCAL, 1450 IPV6_SADDR_RULE_SCOPE, 1451 IPV6_SADDR_RULE_PREFERRED, 1452 #ifdef CONFIG_IPV6_MIP6 1453 IPV6_SADDR_RULE_HOA, 1454 #endif 1455 IPV6_SADDR_RULE_OIF, 1456 IPV6_SADDR_RULE_LABEL, 1457 IPV6_SADDR_RULE_PRIVACY, 1458 IPV6_SADDR_RULE_ORCHID, 1459 IPV6_SADDR_RULE_PREFIX, 1460 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1461 IPV6_SADDR_RULE_NOT_OPTIMISTIC, 1462 #endif 1463 IPV6_SADDR_RULE_MAX 1464 }; 1465 1466 struct ipv6_saddr_score { 1467 int rule; 1468 int addr_type; 1469 struct inet6_ifaddr *ifa; 1470 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX); 1471 int scopedist; 1472 int matchlen; 1473 }; 1474 1475 struct ipv6_saddr_dst { 1476 const struct in6_addr *addr; 1477 int ifindex; 1478 int scope; 1479 int label; 1480 unsigned int prefs; 1481 }; 1482 1483 static inline int ipv6_saddr_preferred(int type) 1484 { 1485 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK)) 1486 return 1; 1487 return 0; 1488 } 1489 1490 static bool ipv6_use_optimistic_addr(struct net *net, 1491 struct inet6_dev *idev) 1492 { 1493 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1494 if (!idev) 1495 return false; 1496 if (!net->ipv6.devconf_all->optimistic_dad && !idev->cnf.optimistic_dad) 1497 return false; 1498 if (!net->ipv6.devconf_all->use_optimistic && !idev->cnf.use_optimistic) 1499 return false; 1500 1501 return true; 1502 #else 1503 return false; 1504 #endif 1505 } 1506 1507 static bool ipv6_allow_optimistic_dad(struct net *net, 1508 struct inet6_dev *idev) 1509 { 1510 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1511 if (!idev) 1512 return false; 1513 if (!net->ipv6.devconf_all->optimistic_dad && !idev->cnf.optimistic_dad) 1514 return false; 1515 1516 return true; 1517 #else 1518 return false; 1519 #endif 1520 } 1521 1522 static int ipv6_get_saddr_eval(struct net *net, 1523 struct ipv6_saddr_score *score, 1524 struct ipv6_saddr_dst *dst, 1525 int i) 1526 { 1527 int ret; 1528 1529 if (i <= score->rule) { 1530 switch (i) { 1531 case IPV6_SADDR_RULE_SCOPE: 1532 ret = score->scopedist; 1533 break; 1534 case IPV6_SADDR_RULE_PREFIX: 1535 ret = score->matchlen; 1536 break; 1537 default: 1538 ret = !!test_bit(i, score->scorebits); 1539 } 1540 goto out; 1541 } 1542 1543 switch (i) { 1544 case IPV6_SADDR_RULE_INIT: 1545 /* Rule 0: remember if hiscore is not ready yet */ 1546 ret = !!score->ifa; 1547 break; 1548 case IPV6_SADDR_RULE_LOCAL: 1549 /* Rule 1: Prefer same address */ 1550 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr); 1551 break; 1552 case IPV6_SADDR_RULE_SCOPE: 1553 /* Rule 2: Prefer appropriate scope 1554 * 1555 * ret 1556 * ^ 1557 * -1 | d 15 1558 * ---+--+-+---> scope 1559 * | 1560 * | d is scope of the destination. 1561 * B-d | \ 1562 * | \ <- smaller scope is better if 1563 * B-15 | \ if scope is enough for destination. 1564 * | ret = B - scope (-1 <= scope >= d <= 15). 1565 * d-C-1 | / 1566 * |/ <- greater is better 1567 * -C / if scope is not enough for destination. 1568 * /| ret = scope - C (-1 <= d < scope <= 15). 1569 * 1570 * d - C - 1 < B -15 (for all -1 <= d <= 15). 1571 * C > d + 14 - B >= 15 + 14 - B = 29 - B. 1572 * Assume B = 0 and we get C > 29. 1573 */ 1574 ret = __ipv6_addr_src_scope(score->addr_type); 1575 if (ret >= dst->scope) 1576 ret = -ret; 1577 else 1578 ret -= 128; /* 30 is enough */ 1579 score->scopedist = ret; 1580 break; 1581 case IPV6_SADDR_RULE_PREFERRED: 1582 { 1583 /* Rule 3: Avoid deprecated and optimistic addresses */ 1584 u8 avoid = IFA_F_DEPRECATED; 1585 1586 if (!ipv6_use_optimistic_addr(net, score->ifa->idev)) 1587 avoid |= IFA_F_OPTIMISTIC; 1588 ret = ipv6_saddr_preferred(score->addr_type) || 1589 !(score->ifa->flags & avoid); 1590 break; 1591 } 1592 #ifdef CONFIG_IPV6_MIP6 1593 case IPV6_SADDR_RULE_HOA: 1594 { 1595 /* Rule 4: Prefer home address */ 1596 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA); 1597 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome; 1598 break; 1599 } 1600 #endif 1601 case IPV6_SADDR_RULE_OIF: 1602 /* Rule 5: Prefer outgoing interface */ 1603 ret = (!dst->ifindex || 1604 dst->ifindex == score->ifa->idev->dev->ifindex); 1605 break; 1606 case IPV6_SADDR_RULE_LABEL: 1607 /* Rule 6: Prefer matching label */ 1608 ret = ipv6_addr_label(net, 1609 &score->ifa->addr, score->addr_type, 1610 score->ifa->idev->dev->ifindex) == dst->label; 1611 break; 1612 case IPV6_SADDR_RULE_PRIVACY: 1613 { 1614 /* Rule 7: Prefer public address 1615 * Note: prefer temporary address if use_tempaddr >= 2 1616 */ 1617 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ? 1618 !!(dst->prefs & IPV6_PREFER_SRC_TMP) : 1619 score->ifa->idev->cnf.use_tempaddr >= 2; 1620 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp; 1621 break; 1622 } 1623 case IPV6_SADDR_RULE_ORCHID: 1624 /* Rule 8-: Prefer ORCHID vs ORCHID or 1625 * non-ORCHID vs non-ORCHID 1626 */ 1627 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^ 1628 ipv6_addr_orchid(dst->addr)); 1629 break; 1630 case IPV6_SADDR_RULE_PREFIX: 1631 /* Rule 8: Use longest matching prefix */ 1632 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr); 1633 if (ret > score->ifa->prefix_len) 1634 ret = score->ifa->prefix_len; 1635 score->matchlen = ret; 1636 break; 1637 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1638 case IPV6_SADDR_RULE_NOT_OPTIMISTIC: 1639 /* Optimistic addresses still have lower precedence than other 1640 * preferred addresses. 1641 */ 1642 ret = !(score->ifa->flags & IFA_F_OPTIMISTIC); 1643 break; 1644 #endif 1645 default: 1646 ret = 0; 1647 } 1648 1649 if (ret) 1650 __set_bit(i, score->scorebits); 1651 score->rule = i; 1652 out: 1653 return ret; 1654 } 1655 1656 static int __ipv6_dev_get_saddr(struct net *net, 1657 struct ipv6_saddr_dst *dst, 1658 struct inet6_dev *idev, 1659 struct ipv6_saddr_score *scores, 1660 int hiscore_idx) 1661 { 1662 struct ipv6_saddr_score *score = &scores[1 - hiscore_idx], *hiscore = &scores[hiscore_idx]; 1663 1664 list_for_each_entry_rcu(score->ifa, &idev->addr_list, if_list) { 1665 int i; 1666 1667 /* 1668 * - Tentative Address (RFC2462 section 5.4) 1669 * - A tentative address is not considered 1670 * "assigned to an interface" in the traditional 1671 * sense, unless it is also flagged as optimistic. 1672 * - Candidate Source Address (section 4) 1673 * - In any case, anycast addresses, multicast 1674 * addresses, and the unspecified address MUST 1675 * NOT be included in a candidate set. 1676 */ 1677 if ((score->ifa->flags & IFA_F_TENTATIVE) && 1678 (!(score->ifa->flags & IFA_F_OPTIMISTIC))) 1679 continue; 1680 1681 score->addr_type = __ipv6_addr_type(&score->ifa->addr); 1682 1683 if (unlikely(score->addr_type == IPV6_ADDR_ANY || 1684 score->addr_type & IPV6_ADDR_MULTICAST)) { 1685 net_dbg_ratelimited("ADDRCONF: unspecified / multicast address assigned as unicast address on %s", 1686 idev->dev->name); 1687 continue; 1688 } 1689 1690 score->rule = -1; 1691 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX); 1692 1693 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) { 1694 int minihiscore, miniscore; 1695 1696 minihiscore = ipv6_get_saddr_eval(net, hiscore, dst, i); 1697 miniscore = ipv6_get_saddr_eval(net, score, dst, i); 1698 1699 if (minihiscore > miniscore) { 1700 if (i == IPV6_SADDR_RULE_SCOPE && 1701 score->scopedist > 0) { 1702 /* 1703 * special case: 1704 * each remaining entry 1705 * has too small (not enough) 1706 * scope, because ifa entries 1707 * are sorted by their scope 1708 * values. 1709 */ 1710 goto out; 1711 } 1712 break; 1713 } else if (minihiscore < miniscore) { 1714 swap(hiscore, score); 1715 hiscore_idx = 1 - hiscore_idx; 1716 1717 /* restore our iterator */ 1718 score->ifa = hiscore->ifa; 1719 1720 break; 1721 } 1722 } 1723 } 1724 out: 1725 return hiscore_idx; 1726 } 1727 1728 static int ipv6_get_saddr_master(struct net *net, 1729 const struct net_device *dst_dev, 1730 const struct net_device *master, 1731 struct ipv6_saddr_dst *dst, 1732 struct ipv6_saddr_score *scores, 1733 int hiscore_idx) 1734 { 1735 struct inet6_dev *idev; 1736 1737 idev = __in6_dev_get(dst_dev); 1738 if (idev) 1739 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev, 1740 scores, hiscore_idx); 1741 1742 idev = __in6_dev_get(master); 1743 if (idev) 1744 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev, 1745 scores, hiscore_idx); 1746 1747 return hiscore_idx; 1748 } 1749 1750 int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev, 1751 const struct in6_addr *daddr, unsigned int prefs, 1752 struct in6_addr *saddr) 1753 { 1754 struct ipv6_saddr_score scores[2], *hiscore; 1755 struct ipv6_saddr_dst dst; 1756 struct inet6_dev *idev; 1757 struct net_device *dev; 1758 int dst_type; 1759 bool use_oif_addr = false; 1760 int hiscore_idx = 0; 1761 int ret = 0; 1762 1763 dst_type = __ipv6_addr_type(daddr); 1764 dst.addr = daddr; 1765 dst.ifindex = dst_dev ? dst_dev->ifindex : 0; 1766 dst.scope = __ipv6_addr_src_scope(dst_type); 1767 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex); 1768 dst.prefs = prefs; 1769 1770 scores[hiscore_idx].rule = -1; 1771 scores[hiscore_idx].ifa = NULL; 1772 1773 rcu_read_lock(); 1774 1775 /* Candidate Source Address (section 4) 1776 * - multicast and link-local destination address, 1777 * the set of candidate source address MUST only 1778 * include addresses assigned to interfaces 1779 * belonging to the same link as the outgoing 1780 * interface. 1781 * (- For site-local destination addresses, the 1782 * set of candidate source addresses MUST only 1783 * include addresses assigned to interfaces 1784 * belonging to the same site as the outgoing 1785 * interface.) 1786 * - "It is RECOMMENDED that the candidate source addresses 1787 * be the set of unicast addresses assigned to the 1788 * interface that will be used to send to the destination 1789 * (the 'outgoing' interface)." (RFC 6724) 1790 */ 1791 if (dst_dev) { 1792 idev = __in6_dev_get(dst_dev); 1793 if ((dst_type & IPV6_ADDR_MULTICAST) || 1794 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL || 1795 (idev && idev->cnf.use_oif_addrs_only)) { 1796 use_oif_addr = true; 1797 } 1798 } 1799 1800 if (use_oif_addr) { 1801 if (idev) 1802 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx); 1803 } else { 1804 const struct net_device *master; 1805 int master_idx = 0; 1806 1807 /* if dst_dev exists and is enslaved to an L3 device, then 1808 * prefer addresses from dst_dev and then the master over 1809 * any other enslaved devices in the L3 domain. 1810 */ 1811 master = l3mdev_master_dev_rcu(dst_dev); 1812 if (master) { 1813 master_idx = master->ifindex; 1814 1815 hiscore_idx = ipv6_get_saddr_master(net, dst_dev, 1816 master, &dst, 1817 scores, hiscore_idx); 1818 1819 if (scores[hiscore_idx].ifa) 1820 goto out; 1821 } 1822 1823 for_each_netdev_rcu(net, dev) { 1824 /* only consider addresses on devices in the 1825 * same L3 domain 1826 */ 1827 if (l3mdev_master_ifindex_rcu(dev) != master_idx) 1828 continue; 1829 idev = __in6_dev_get(dev); 1830 if (!idev) 1831 continue; 1832 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx); 1833 } 1834 } 1835 1836 out: 1837 hiscore = &scores[hiscore_idx]; 1838 if (!hiscore->ifa) 1839 ret = -EADDRNOTAVAIL; 1840 else 1841 *saddr = hiscore->ifa->addr; 1842 1843 rcu_read_unlock(); 1844 return ret; 1845 } 1846 EXPORT_SYMBOL(ipv6_dev_get_saddr); 1847 1848 static int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr, 1849 u32 banned_flags) 1850 { 1851 struct inet6_ifaddr *ifp; 1852 int err = -EADDRNOTAVAIL; 1853 1854 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) { 1855 if (ifp->scope > IFA_LINK) 1856 break; 1857 if (ifp->scope == IFA_LINK && 1858 !(ifp->flags & banned_flags)) { 1859 *addr = ifp->addr; 1860 err = 0; 1861 break; 1862 } 1863 } 1864 return err; 1865 } 1866 1867 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr, 1868 u32 banned_flags) 1869 { 1870 struct inet6_dev *idev; 1871 int err = -EADDRNOTAVAIL; 1872 1873 rcu_read_lock(); 1874 idev = __in6_dev_get(dev); 1875 if (idev) { 1876 read_lock_bh(&idev->lock); 1877 err = __ipv6_get_lladdr(idev, addr, banned_flags); 1878 read_unlock_bh(&idev->lock); 1879 } 1880 rcu_read_unlock(); 1881 return err; 1882 } 1883 1884 static int ipv6_count_addresses(const struct inet6_dev *idev) 1885 { 1886 const struct inet6_ifaddr *ifp; 1887 int cnt = 0; 1888 1889 rcu_read_lock(); 1890 list_for_each_entry_rcu(ifp, &idev->addr_list, if_list) 1891 cnt++; 1892 rcu_read_unlock(); 1893 return cnt; 1894 } 1895 1896 int ipv6_chk_addr(struct net *net, const struct in6_addr *addr, 1897 const struct net_device *dev, int strict) 1898 { 1899 return ipv6_chk_addr_and_flags(net, addr, dev, !dev, 1900 strict, IFA_F_TENTATIVE); 1901 } 1902 EXPORT_SYMBOL(ipv6_chk_addr); 1903 1904 /* device argument is used to find the L3 domain of interest. If 1905 * skip_dev_check is set, then the ifp device is not checked against 1906 * the passed in dev argument. So the 2 cases for addresses checks are: 1907 * 1. does the address exist in the L3 domain that dev is part of 1908 * (skip_dev_check = true), or 1909 * 1910 * 2. does the address exist on the specific device 1911 * (skip_dev_check = false) 1912 */ 1913 static struct net_device * 1914 __ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr, 1915 const struct net_device *dev, bool skip_dev_check, 1916 int strict, u32 banned_flags) 1917 { 1918 unsigned int hash = inet6_addr_hash(net, addr); 1919 struct net_device *l3mdev, *ndev; 1920 struct inet6_ifaddr *ifp; 1921 u32 ifp_flags; 1922 1923 rcu_read_lock(); 1924 1925 l3mdev = l3mdev_master_dev_rcu(dev); 1926 if (skip_dev_check) 1927 dev = NULL; 1928 1929 hlist_for_each_entry_rcu(ifp, &net->ipv6.inet6_addr_lst[hash], addr_lst) { 1930 ndev = ifp->idev->dev; 1931 1932 if (l3mdev_master_dev_rcu(ndev) != l3mdev) 1933 continue; 1934 1935 /* Decouple optimistic from tentative for evaluation here. 1936 * Ban optimistic addresses explicitly, when required. 1937 */ 1938 ifp_flags = (ifp->flags&IFA_F_OPTIMISTIC) 1939 ? (ifp->flags&~IFA_F_TENTATIVE) 1940 : ifp->flags; 1941 if (ipv6_addr_equal(&ifp->addr, addr) && 1942 !(ifp_flags&banned_flags) && 1943 (!dev || ndev == dev || 1944 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) { 1945 rcu_read_unlock(); 1946 return ndev; 1947 } 1948 } 1949 1950 rcu_read_unlock(); 1951 return NULL; 1952 } 1953 1954 int ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr, 1955 const struct net_device *dev, bool skip_dev_check, 1956 int strict, u32 banned_flags) 1957 { 1958 return __ipv6_chk_addr_and_flags(net, addr, dev, skip_dev_check, 1959 strict, banned_flags) ? 1 : 0; 1960 } 1961 EXPORT_SYMBOL(ipv6_chk_addr_and_flags); 1962 1963 1964 /* Compares an address/prefix_len with addresses on device @dev. 1965 * If one is found it returns true. 1966 */ 1967 bool ipv6_chk_custom_prefix(const struct in6_addr *addr, 1968 const unsigned int prefix_len, struct net_device *dev) 1969 { 1970 const struct inet6_ifaddr *ifa; 1971 const struct inet6_dev *idev; 1972 bool ret = false; 1973 1974 rcu_read_lock(); 1975 idev = __in6_dev_get(dev); 1976 if (idev) { 1977 list_for_each_entry_rcu(ifa, &idev->addr_list, if_list) { 1978 ret = ipv6_prefix_equal(addr, &ifa->addr, prefix_len); 1979 if (ret) 1980 break; 1981 } 1982 } 1983 rcu_read_unlock(); 1984 1985 return ret; 1986 } 1987 EXPORT_SYMBOL(ipv6_chk_custom_prefix); 1988 1989 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev) 1990 { 1991 const struct inet6_ifaddr *ifa; 1992 const struct inet6_dev *idev; 1993 int onlink; 1994 1995 onlink = 0; 1996 rcu_read_lock(); 1997 idev = __in6_dev_get(dev); 1998 if (idev) { 1999 list_for_each_entry_rcu(ifa, &idev->addr_list, if_list) { 2000 onlink = ipv6_prefix_equal(addr, &ifa->addr, 2001 ifa->prefix_len); 2002 if (onlink) 2003 break; 2004 } 2005 } 2006 rcu_read_unlock(); 2007 return onlink; 2008 } 2009 EXPORT_SYMBOL(ipv6_chk_prefix); 2010 2011 /** 2012 * ipv6_dev_find - find the first device with a given source address. 2013 * @net: the net namespace 2014 * @addr: the source address 2015 * @dev: used to find the L3 domain of interest 2016 * 2017 * The caller should be protected by RCU, or RTNL. 2018 */ 2019 struct net_device *ipv6_dev_find(struct net *net, const struct in6_addr *addr, 2020 struct net_device *dev) 2021 { 2022 return __ipv6_chk_addr_and_flags(net, addr, dev, !dev, 1, 2023 IFA_F_TENTATIVE); 2024 } 2025 EXPORT_SYMBOL(ipv6_dev_find); 2026 2027 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr, 2028 struct net_device *dev, int strict) 2029 { 2030 unsigned int hash = inet6_addr_hash(net, addr); 2031 struct inet6_ifaddr *ifp, *result = NULL; 2032 2033 rcu_read_lock(); 2034 hlist_for_each_entry_rcu(ifp, &net->ipv6.inet6_addr_lst[hash], addr_lst) { 2035 if (ipv6_addr_equal(&ifp->addr, addr)) { 2036 if (!dev || ifp->idev->dev == dev || 2037 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) { 2038 result = ifp; 2039 in6_ifa_hold(ifp); 2040 break; 2041 } 2042 } 2043 } 2044 rcu_read_unlock(); 2045 2046 return result; 2047 } 2048 2049 /* Gets referenced address, destroys ifaddr */ 2050 2051 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed) 2052 { 2053 if (dad_failed) 2054 ifp->flags |= IFA_F_DADFAILED; 2055 2056 if (ifp->flags&IFA_F_TEMPORARY) { 2057 struct inet6_ifaddr *ifpub; 2058 spin_lock_bh(&ifp->lock); 2059 ifpub = ifp->ifpub; 2060 if (ifpub) { 2061 in6_ifa_hold(ifpub); 2062 spin_unlock_bh(&ifp->lock); 2063 ipv6_create_tempaddr(ifpub, true); 2064 in6_ifa_put(ifpub); 2065 } else { 2066 spin_unlock_bh(&ifp->lock); 2067 } 2068 ipv6_del_addr(ifp); 2069 } else if (ifp->flags&IFA_F_PERMANENT || !dad_failed) { 2070 spin_lock_bh(&ifp->lock); 2071 addrconf_del_dad_work(ifp); 2072 ifp->flags |= IFA_F_TENTATIVE; 2073 if (dad_failed) 2074 ifp->flags &= ~IFA_F_OPTIMISTIC; 2075 spin_unlock_bh(&ifp->lock); 2076 if (dad_failed) 2077 ipv6_ifa_notify(0, ifp); 2078 in6_ifa_put(ifp); 2079 } else { 2080 ipv6_del_addr(ifp); 2081 } 2082 } 2083 2084 static int addrconf_dad_end(struct inet6_ifaddr *ifp) 2085 { 2086 int err = -ENOENT; 2087 2088 spin_lock_bh(&ifp->lock); 2089 if (ifp->state == INET6_IFADDR_STATE_DAD) { 2090 ifp->state = INET6_IFADDR_STATE_POSTDAD; 2091 err = 0; 2092 } 2093 spin_unlock_bh(&ifp->lock); 2094 2095 return err; 2096 } 2097 2098 void addrconf_dad_failure(struct sk_buff *skb, struct inet6_ifaddr *ifp) 2099 { 2100 struct inet6_dev *idev = ifp->idev; 2101 struct net *net = dev_net(idev->dev); 2102 2103 if (addrconf_dad_end(ifp)) { 2104 in6_ifa_put(ifp); 2105 return; 2106 } 2107 2108 net_info_ratelimited("%s: IPv6 duplicate address %pI6c used by %pM detected!\n", 2109 ifp->idev->dev->name, &ifp->addr, eth_hdr(skb)->h_source); 2110 2111 spin_lock_bh(&ifp->lock); 2112 2113 if (ifp->flags & IFA_F_STABLE_PRIVACY) { 2114 struct in6_addr new_addr; 2115 struct inet6_ifaddr *ifp2; 2116 int retries = ifp->stable_privacy_retry + 1; 2117 struct ifa6_config cfg = { 2118 .pfx = &new_addr, 2119 .plen = ifp->prefix_len, 2120 .ifa_flags = ifp->flags, 2121 .valid_lft = ifp->valid_lft, 2122 .preferred_lft = ifp->prefered_lft, 2123 .scope = ifp->scope, 2124 }; 2125 2126 if (retries > net->ipv6.sysctl.idgen_retries) { 2127 net_info_ratelimited("%s: privacy stable address generation failed because of DAD conflicts!\n", 2128 ifp->idev->dev->name); 2129 goto errdad; 2130 } 2131 2132 new_addr = ifp->addr; 2133 if (ipv6_generate_stable_address(&new_addr, retries, 2134 idev)) 2135 goto errdad; 2136 2137 spin_unlock_bh(&ifp->lock); 2138 2139 if (idev->cnf.max_addresses && 2140 ipv6_count_addresses(idev) >= 2141 idev->cnf.max_addresses) 2142 goto lock_errdad; 2143 2144 net_info_ratelimited("%s: generating new stable privacy address because of DAD conflict\n", 2145 ifp->idev->dev->name); 2146 2147 ifp2 = ipv6_add_addr(idev, &cfg, false, NULL); 2148 if (IS_ERR(ifp2)) 2149 goto lock_errdad; 2150 2151 spin_lock_bh(&ifp2->lock); 2152 ifp2->stable_privacy_retry = retries; 2153 ifp2->state = INET6_IFADDR_STATE_PREDAD; 2154 spin_unlock_bh(&ifp2->lock); 2155 2156 addrconf_mod_dad_work(ifp2, net->ipv6.sysctl.idgen_delay); 2157 in6_ifa_put(ifp2); 2158 lock_errdad: 2159 spin_lock_bh(&ifp->lock); 2160 } 2161 2162 errdad: 2163 /* transition from _POSTDAD to _ERRDAD */ 2164 ifp->state = INET6_IFADDR_STATE_ERRDAD; 2165 spin_unlock_bh(&ifp->lock); 2166 2167 addrconf_mod_dad_work(ifp, 0); 2168 in6_ifa_put(ifp); 2169 } 2170 2171 /* Join to solicited addr multicast group. 2172 * caller must hold RTNL */ 2173 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr) 2174 { 2175 struct in6_addr maddr; 2176 2177 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP)) 2178 return; 2179 2180 addrconf_addr_solict_mult(addr, &maddr); 2181 ipv6_dev_mc_inc(dev, &maddr); 2182 } 2183 2184 /* caller must hold RTNL */ 2185 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr) 2186 { 2187 struct in6_addr maddr; 2188 2189 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP)) 2190 return; 2191 2192 addrconf_addr_solict_mult(addr, &maddr); 2193 __ipv6_dev_mc_dec(idev, &maddr); 2194 } 2195 2196 /* caller must hold RTNL */ 2197 static void addrconf_join_anycast(struct inet6_ifaddr *ifp) 2198 { 2199 struct in6_addr addr; 2200 2201 if (ifp->prefix_len >= 127) /* RFC 6164 */ 2202 return; 2203 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len); 2204 if (ipv6_addr_any(&addr)) 2205 return; 2206 __ipv6_dev_ac_inc(ifp->idev, &addr); 2207 } 2208 2209 /* caller must hold RTNL */ 2210 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp) 2211 { 2212 struct in6_addr addr; 2213 2214 if (ifp->prefix_len >= 127) /* RFC 6164 */ 2215 return; 2216 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len); 2217 if (ipv6_addr_any(&addr)) 2218 return; 2219 __ipv6_dev_ac_dec(ifp->idev, &addr); 2220 } 2221 2222 static int addrconf_ifid_6lowpan(u8 *eui, struct net_device *dev) 2223 { 2224 switch (dev->addr_len) { 2225 case ETH_ALEN: 2226 memcpy(eui, dev->dev_addr, 3); 2227 eui[3] = 0xFF; 2228 eui[4] = 0xFE; 2229 memcpy(eui + 5, dev->dev_addr + 3, 3); 2230 break; 2231 case EUI64_ADDR_LEN: 2232 memcpy(eui, dev->dev_addr, EUI64_ADDR_LEN); 2233 eui[0] ^= 2; 2234 break; 2235 default: 2236 return -1; 2237 } 2238 2239 return 0; 2240 } 2241 2242 static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev) 2243 { 2244 const union fwnet_hwaddr *ha; 2245 2246 if (dev->addr_len != FWNET_ALEN) 2247 return -1; 2248 2249 ha = (const union fwnet_hwaddr *)dev->dev_addr; 2250 2251 memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id)); 2252 eui[0] ^= 2; 2253 return 0; 2254 } 2255 2256 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev) 2257 { 2258 /* XXX: inherit EUI-64 from other interface -- yoshfuji */ 2259 if (dev->addr_len != ARCNET_ALEN) 2260 return -1; 2261 memset(eui, 0, 7); 2262 eui[7] = *(u8 *)dev->dev_addr; 2263 return 0; 2264 } 2265 2266 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev) 2267 { 2268 if (dev->addr_len != INFINIBAND_ALEN) 2269 return -1; 2270 memcpy(eui, dev->dev_addr + 12, 8); 2271 eui[0] |= 2; 2272 return 0; 2273 } 2274 2275 static int __ipv6_isatap_ifid(u8 *eui, __be32 addr) 2276 { 2277 if (addr == 0) 2278 return -1; 2279 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) || 2280 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) || 2281 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) || 2282 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) || 2283 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) || 2284 ipv4_is_lbcast(addr)) ? 0x00 : 0x02; 2285 eui[1] = 0; 2286 eui[2] = 0x5E; 2287 eui[3] = 0xFE; 2288 memcpy(eui + 4, &addr, 4); 2289 return 0; 2290 } 2291 2292 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev) 2293 { 2294 if (dev->priv_flags & IFF_ISATAP) 2295 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr); 2296 return -1; 2297 } 2298 2299 static int addrconf_ifid_gre(u8 *eui, struct net_device *dev) 2300 { 2301 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr); 2302 } 2303 2304 static int addrconf_ifid_ip6tnl(u8 *eui, struct net_device *dev) 2305 { 2306 memcpy(eui, dev->perm_addr, 3); 2307 memcpy(eui + 5, dev->perm_addr + 3, 3); 2308 eui[3] = 0xFF; 2309 eui[4] = 0xFE; 2310 eui[0] ^= 2; 2311 return 0; 2312 } 2313 2314 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev) 2315 { 2316 switch (dev->type) { 2317 case ARPHRD_ETHER: 2318 case ARPHRD_FDDI: 2319 return addrconf_ifid_eui48(eui, dev); 2320 case ARPHRD_ARCNET: 2321 return addrconf_ifid_arcnet(eui, dev); 2322 case ARPHRD_INFINIBAND: 2323 return addrconf_ifid_infiniband(eui, dev); 2324 case ARPHRD_SIT: 2325 return addrconf_ifid_sit(eui, dev); 2326 case ARPHRD_IPGRE: 2327 case ARPHRD_TUNNEL: 2328 return addrconf_ifid_gre(eui, dev); 2329 case ARPHRD_6LOWPAN: 2330 return addrconf_ifid_6lowpan(eui, dev); 2331 case ARPHRD_IEEE1394: 2332 return addrconf_ifid_ieee1394(eui, dev); 2333 case ARPHRD_TUNNEL6: 2334 case ARPHRD_IP6GRE: 2335 case ARPHRD_RAWIP: 2336 return addrconf_ifid_ip6tnl(eui, dev); 2337 } 2338 return -1; 2339 } 2340 2341 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev) 2342 { 2343 int err = -1; 2344 struct inet6_ifaddr *ifp; 2345 2346 read_lock_bh(&idev->lock); 2347 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) { 2348 if (ifp->scope > IFA_LINK) 2349 break; 2350 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) { 2351 memcpy(eui, ifp->addr.s6_addr+8, 8); 2352 err = 0; 2353 break; 2354 } 2355 } 2356 read_unlock_bh(&idev->lock); 2357 return err; 2358 } 2359 2360 /* Generation of a randomized Interface Identifier 2361 * draft-ietf-6man-rfc4941bis, Section 3.3.1 2362 */ 2363 2364 static void ipv6_gen_rnd_iid(struct in6_addr *addr) 2365 { 2366 regen: 2367 get_random_bytes(&addr->s6_addr[8], 8); 2368 2369 /* <draft-ietf-6man-rfc4941bis-08.txt>, Section 3.3.1: 2370 * check if generated address is not inappropriate: 2371 * 2372 * - Reserved IPv6 Interface Identifiers 2373 * - XXX: already assigned to an address on the device 2374 */ 2375 2376 /* Subnet-router anycast: 0000:0000:0000:0000 */ 2377 if (!(addr->s6_addr32[2] | addr->s6_addr32[3])) 2378 goto regen; 2379 2380 /* IANA Ethernet block: 0200:5EFF:FE00:0000-0200:5EFF:FE00:5212 2381 * Proxy Mobile IPv6: 0200:5EFF:FE00:5213 2382 * IANA Ethernet block: 0200:5EFF:FE00:5214-0200:5EFF:FEFF:FFFF 2383 */ 2384 if (ntohl(addr->s6_addr32[2]) == 0x02005eff && 2385 (ntohl(addr->s6_addr32[3]) & 0Xff000000) == 0xfe000000) 2386 goto regen; 2387 2388 /* Reserved subnet anycast addresses */ 2389 if (ntohl(addr->s6_addr32[2]) == 0xfdffffff && 2390 ntohl(addr->s6_addr32[3]) >= 0Xffffff80) 2391 goto regen; 2392 } 2393 2394 /* 2395 * Add prefix route. 2396 */ 2397 2398 static void 2399 addrconf_prefix_route(struct in6_addr *pfx, int plen, u32 metric, 2400 struct net_device *dev, unsigned long expires, 2401 u32 flags, gfp_t gfp_flags) 2402 { 2403 struct fib6_config cfg = { 2404 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX, 2405 .fc_metric = metric ? : IP6_RT_PRIO_ADDRCONF, 2406 .fc_ifindex = dev->ifindex, 2407 .fc_expires = expires, 2408 .fc_dst_len = plen, 2409 .fc_flags = RTF_UP | flags, 2410 .fc_nlinfo.nl_net = dev_net(dev), 2411 .fc_protocol = RTPROT_KERNEL, 2412 .fc_type = RTN_UNICAST, 2413 }; 2414 2415 cfg.fc_dst = *pfx; 2416 2417 /* Prevent useless cloning on PtP SIT. 2418 This thing is done here expecting that the whole 2419 class of non-broadcast devices need not cloning. 2420 */ 2421 #if IS_ENABLED(CONFIG_IPV6_SIT) 2422 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT)) 2423 cfg.fc_flags |= RTF_NONEXTHOP; 2424 #endif 2425 2426 ip6_route_add(&cfg, gfp_flags, NULL); 2427 } 2428 2429 2430 static struct fib6_info *addrconf_get_prefix_route(const struct in6_addr *pfx, 2431 int plen, 2432 const struct net_device *dev, 2433 u32 flags, u32 noflags, 2434 bool no_gw) 2435 { 2436 struct fib6_node *fn; 2437 struct fib6_info *rt = NULL; 2438 struct fib6_table *table; 2439 u32 tb_id = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX; 2440 2441 table = fib6_get_table(dev_net(dev), tb_id); 2442 if (!table) 2443 return NULL; 2444 2445 rcu_read_lock(); 2446 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0, true); 2447 if (!fn) 2448 goto out; 2449 2450 for_each_fib6_node_rt_rcu(fn) { 2451 /* prefix routes only use builtin fib6_nh */ 2452 if (rt->nh) 2453 continue; 2454 2455 if (rt->fib6_nh->fib_nh_dev->ifindex != dev->ifindex) 2456 continue; 2457 if (no_gw && rt->fib6_nh->fib_nh_gw_family) 2458 continue; 2459 if ((rt->fib6_flags & flags) != flags) 2460 continue; 2461 if ((rt->fib6_flags & noflags) != 0) 2462 continue; 2463 if (!fib6_info_hold_safe(rt)) 2464 continue; 2465 break; 2466 } 2467 out: 2468 rcu_read_unlock(); 2469 return rt; 2470 } 2471 2472 2473 /* Create "default" multicast route to the interface */ 2474 2475 static void addrconf_add_mroute(struct net_device *dev) 2476 { 2477 struct fib6_config cfg = { 2478 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_LOCAL, 2479 .fc_metric = IP6_RT_PRIO_ADDRCONF, 2480 .fc_ifindex = dev->ifindex, 2481 .fc_dst_len = 8, 2482 .fc_flags = RTF_UP, 2483 .fc_type = RTN_MULTICAST, 2484 .fc_nlinfo.nl_net = dev_net(dev), 2485 .fc_protocol = RTPROT_KERNEL, 2486 }; 2487 2488 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0); 2489 2490 ip6_route_add(&cfg, GFP_KERNEL, NULL); 2491 } 2492 2493 static struct inet6_dev *addrconf_add_dev(struct net_device *dev) 2494 { 2495 struct inet6_dev *idev; 2496 2497 ASSERT_RTNL(); 2498 2499 idev = ipv6_find_idev(dev); 2500 if (IS_ERR(idev)) 2501 return idev; 2502 2503 if (idev->cnf.disable_ipv6) 2504 return ERR_PTR(-EACCES); 2505 2506 /* Add default multicast route */ 2507 if (!(dev->flags & IFF_LOOPBACK) && !netif_is_l3_master(dev)) 2508 addrconf_add_mroute(dev); 2509 2510 return idev; 2511 } 2512 2513 static void manage_tempaddrs(struct inet6_dev *idev, 2514 struct inet6_ifaddr *ifp, 2515 __u32 valid_lft, __u32 prefered_lft, 2516 bool create, unsigned long now) 2517 { 2518 u32 flags; 2519 struct inet6_ifaddr *ift; 2520 2521 read_lock_bh(&idev->lock); 2522 /* update all temporary addresses in the list */ 2523 list_for_each_entry(ift, &idev->tempaddr_list, tmp_list) { 2524 int age, max_valid, max_prefered; 2525 2526 if (ifp != ift->ifpub) 2527 continue; 2528 2529 /* RFC 4941 section 3.3: 2530 * If a received option will extend the lifetime of a public 2531 * address, the lifetimes of temporary addresses should 2532 * be extended, subject to the overall constraint that no 2533 * temporary addresses should ever remain "valid" or "preferred" 2534 * for a time longer than (TEMP_VALID_LIFETIME) or 2535 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), respectively. 2536 */ 2537 age = (now - ift->cstamp) / HZ; 2538 max_valid = idev->cnf.temp_valid_lft - age; 2539 if (max_valid < 0) 2540 max_valid = 0; 2541 2542 max_prefered = idev->cnf.temp_prefered_lft - 2543 idev->desync_factor - age; 2544 if (max_prefered < 0) 2545 max_prefered = 0; 2546 2547 if (valid_lft > max_valid) 2548 valid_lft = max_valid; 2549 2550 if (prefered_lft > max_prefered) 2551 prefered_lft = max_prefered; 2552 2553 spin_lock(&ift->lock); 2554 flags = ift->flags; 2555 ift->valid_lft = valid_lft; 2556 ift->prefered_lft = prefered_lft; 2557 ift->tstamp = now; 2558 if (prefered_lft > 0) 2559 ift->flags &= ~IFA_F_DEPRECATED; 2560 2561 spin_unlock(&ift->lock); 2562 if (!(flags&IFA_F_TENTATIVE)) 2563 ipv6_ifa_notify(0, ift); 2564 } 2565 2566 /* Also create a temporary address if it's enabled but no temporary 2567 * address currently exists. 2568 * However, we get called with valid_lft == 0, prefered_lft == 0, create == false 2569 * as part of cleanup (ie. deleting the mngtmpaddr). 2570 * We don't want that to result in creating a new temporary ip address. 2571 */ 2572 if (list_empty(&idev->tempaddr_list) && (valid_lft || prefered_lft)) 2573 create = true; 2574 2575 if (create && idev->cnf.use_tempaddr > 0) { 2576 /* When a new public address is created as described 2577 * in [ADDRCONF], also create a new temporary address. 2578 */ 2579 read_unlock_bh(&idev->lock); 2580 ipv6_create_tempaddr(ifp, false); 2581 } else { 2582 read_unlock_bh(&idev->lock); 2583 } 2584 } 2585 2586 static bool is_addr_mode_generate_stable(struct inet6_dev *idev) 2587 { 2588 return idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY || 2589 idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_RANDOM; 2590 } 2591 2592 int addrconf_prefix_rcv_add_addr(struct net *net, struct net_device *dev, 2593 const struct prefix_info *pinfo, 2594 struct inet6_dev *in6_dev, 2595 const struct in6_addr *addr, int addr_type, 2596 u32 addr_flags, bool sllao, bool tokenized, 2597 __u32 valid_lft, u32 prefered_lft) 2598 { 2599 struct inet6_ifaddr *ifp = ipv6_get_ifaddr(net, addr, dev, 1); 2600 int create = 0, update_lft = 0; 2601 2602 if (!ifp && valid_lft) { 2603 int max_addresses = in6_dev->cnf.max_addresses; 2604 struct ifa6_config cfg = { 2605 .pfx = addr, 2606 .plen = pinfo->prefix_len, 2607 .ifa_flags = addr_flags, 2608 .valid_lft = valid_lft, 2609 .preferred_lft = prefered_lft, 2610 .scope = addr_type & IPV6_ADDR_SCOPE_MASK, 2611 .ifa_proto = IFAPROT_KERNEL_RA 2612 }; 2613 2614 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 2615 if ((net->ipv6.devconf_all->optimistic_dad || 2616 in6_dev->cnf.optimistic_dad) && 2617 !net->ipv6.devconf_all->forwarding && sllao) 2618 cfg.ifa_flags |= IFA_F_OPTIMISTIC; 2619 #endif 2620 2621 /* Do not allow to create too much of autoconfigured 2622 * addresses; this would be too easy way to crash kernel. 2623 */ 2624 if (!max_addresses || 2625 ipv6_count_addresses(in6_dev) < max_addresses) 2626 ifp = ipv6_add_addr(in6_dev, &cfg, false, NULL); 2627 2628 if (IS_ERR_OR_NULL(ifp)) 2629 return -1; 2630 2631 create = 1; 2632 spin_lock_bh(&ifp->lock); 2633 ifp->flags |= IFA_F_MANAGETEMPADDR; 2634 ifp->cstamp = jiffies; 2635 ifp->tokenized = tokenized; 2636 spin_unlock_bh(&ifp->lock); 2637 addrconf_dad_start(ifp); 2638 } 2639 2640 if (ifp) { 2641 u32 flags; 2642 unsigned long now; 2643 u32 stored_lft; 2644 2645 /* update lifetime (RFC2462 5.5.3 e) */ 2646 spin_lock_bh(&ifp->lock); 2647 now = jiffies; 2648 if (ifp->valid_lft > (now - ifp->tstamp) / HZ) 2649 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ; 2650 else 2651 stored_lft = 0; 2652 if (!create && stored_lft) { 2653 const u32 minimum_lft = min_t(u32, 2654 stored_lft, MIN_VALID_LIFETIME); 2655 valid_lft = max(valid_lft, minimum_lft); 2656 2657 /* RFC4862 Section 5.5.3e: 2658 * "Note that the preferred lifetime of the 2659 * corresponding address is always reset to 2660 * the Preferred Lifetime in the received 2661 * Prefix Information option, regardless of 2662 * whether the valid lifetime is also reset or 2663 * ignored." 2664 * 2665 * So we should always update prefered_lft here. 2666 */ 2667 update_lft = 1; 2668 } 2669 2670 if (update_lft) { 2671 ifp->valid_lft = valid_lft; 2672 ifp->prefered_lft = prefered_lft; 2673 ifp->tstamp = now; 2674 flags = ifp->flags; 2675 ifp->flags &= ~IFA_F_DEPRECATED; 2676 spin_unlock_bh(&ifp->lock); 2677 2678 if (!(flags&IFA_F_TENTATIVE)) 2679 ipv6_ifa_notify(0, ifp); 2680 } else 2681 spin_unlock_bh(&ifp->lock); 2682 2683 manage_tempaddrs(in6_dev, ifp, valid_lft, prefered_lft, 2684 create, now); 2685 2686 in6_ifa_put(ifp); 2687 addrconf_verify(net); 2688 } 2689 2690 return 0; 2691 } 2692 EXPORT_SYMBOL_GPL(addrconf_prefix_rcv_add_addr); 2693 2694 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao) 2695 { 2696 struct prefix_info *pinfo; 2697 __u32 valid_lft; 2698 __u32 prefered_lft; 2699 int addr_type, err; 2700 u32 addr_flags = 0; 2701 struct inet6_dev *in6_dev; 2702 struct net *net = dev_net(dev); 2703 2704 pinfo = (struct prefix_info *) opt; 2705 2706 if (len < sizeof(struct prefix_info)) { 2707 netdev_dbg(dev, "addrconf: prefix option too short\n"); 2708 return; 2709 } 2710 2711 /* 2712 * Validation checks ([ADDRCONF], page 19) 2713 */ 2714 2715 addr_type = ipv6_addr_type(&pinfo->prefix); 2716 2717 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL)) 2718 return; 2719 2720 valid_lft = ntohl(pinfo->valid); 2721 prefered_lft = ntohl(pinfo->prefered); 2722 2723 if (prefered_lft > valid_lft) { 2724 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n"); 2725 return; 2726 } 2727 2728 in6_dev = in6_dev_get(dev); 2729 2730 if (!in6_dev) { 2731 net_dbg_ratelimited("addrconf: device %s not configured\n", 2732 dev->name); 2733 return; 2734 } 2735 2736 /* 2737 * Two things going on here: 2738 * 1) Add routes for on-link prefixes 2739 * 2) Configure prefixes with the auto flag set 2740 */ 2741 2742 if (pinfo->onlink) { 2743 struct fib6_info *rt; 2744 unsigned long rt_expires; 2745 2746 /* Avoid arithmetic overflow. Really, we could 2747 * save rt_expires in seconds, likely valid_lft, 2748 * but it would require division in fib gc, that it 2749 * not good. 2750 */ 2751 if (HZ > USER_HZ) 2752 rt_expires = addrconf_timeout_fixup(valid_lft, HZ); 2753 else 2754 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ); 2755 2756 if (addrconf_finite_timeout(rt_expires)) 2757 rt_expires *= HZ; 2758 2759 rt = addrconf_get_prefix_route(&pinfo->prefix, 2760 pinfo->prefix_len, 2761 dev, 2762 RTF_ADDRCONF | RTF_PREFIX_RT, 2763 RTF_DEFAULT, true); 2764 2765 if (rt) { 2766 /* Autoconf prefix route */ 2767 if (valid_lft == 0) { 2768 ip6_del_rt(net, rt, false); 2769 rt = NULL; 2770 } else if (addrconf_finite_timeout(rt_expires)) { 2771 /* not infinity */ 2772 fib6_set_expires(rt, jiffies + rt_expires); 2773 } else { 2774 fib6_clean_expires(rt); 2775 } 2776 } else if (valid_lft) { 2777 clock_t expires = 0; 2778 int flags = RTF_ADDRCONF | RTF_PREFIX_RT; 2779 if (addrconf_finite_timeout(rt_expires)) { 2780 /* not infinity */ 2781 flags |= RTF_EXPIRES; 2782 expires = jiffies_to_clock_t(rt_expires); 2783 } 2784 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len, 2785 0, dev, expires, flags, 2786 GFP_ATOMIC); 2787 } 2788 fib6_info_release(rt); 2789 } 2790 2791 /* Try to figure out our local address for this prefix */ 2792 2793 if (pinfo->autoconf && in6_dev->cnf.autoconf) { 2794 struct in6_addr addr; 2795 bool tokenized = false, dev_addr_generated = false; 2796 2797 if (pinfo->prefix_len == 64) { 2798 memcpy(&addr, &pinfo->prefix, 8); 2799 2800 if (!ipv6_addr_any(&in6_dev->token)) { 2801 read_lock_bh(&in6_dev->lock); 2802 memcpy(addr.s6_addr + 8, 2803 in6_dev->token.s6_addr + 8, 8); 2804 read_unlock_bh(&in6_dev->lock); 2805 tokenized = true; 2806 } else if (is_addr_mode_generate_stable(in6_dev) && 2807 !ipv6_generate_stable_address(&addr, 0, 2808 in6_dev)) { 2809 addr_flags |= IFA_F_STABLE_PRIVACY; 2810 goto ok; 2811 } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) && 2812 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) { 2813 goto put; 2814 } else { 2815 dev_addr_generated = true; 2816 } 2817 goto ok; 2818 } 2819 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n", 2820 pinfo->prefix_len); 2821 goto put; 2822 2823 ok: 2824 err = addrconf_prefix_rcv_add_addr(net, dev, pinfo, in6_dev, 2825 &addr, addr_type, 2826 addr_flags, sllao, 2827 tokenized, valid_lft, 2828 prefered_lft); 2829 if (err) 2830 goto put; 2831 2832 /* Ignore error case here because previous prefix add addr was 2833 * successful which will be notified. 2834 */ 2835 ndisc_ops_prefix_rcv_add_addr(net, dev, pinfo, in6_dev, &addr, 2836 addr_type, addr_flags, sllao, 2837 tokenized, valid_lft, 2838 prefered_lft, 2839 dev_addr_generated); 2840 } 2841 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo); 2842 put: 2843 in6_dev_put(in6_dev); 2844 } 2845 2846 static int addrconf_set_sit_dstaddr(struct net *net, struct net_device *dev, 2847 struct in6_ifreq *ireq) 2848 { 2849 struct ip_tunnel_parm p = { }; 2850 int err; 2851 2852 if (!(ipv6_addr_type(&ireq->ifr6_addr) & IPV6_ADDR_COMPATv4)) 2853 return -EADDRNOTAVAIL; 2854 2855 p.iph.daddr = ireq->ifr6_addr.s6_addr32[3]; 2856 p.iph.version = 4; 2857 p.iph.ihl = 5; 2858 p.iph.protocol = IPPROTO_IPV6; 2859 p.iph.ttl = 64; 2860 2861 if (!dev->netdev_ops->ndo_tunnel_ctl) 2862 return -EOPNOTSUPP; 2863 err = dev->netdev_ops->ndo_tunnel_ctl(dev, &p, SIOCADDTUNNEL); 2864 if (err) 2865 return err; 2866 2867 dev = __dev_get_by_name(net, p.name); 2868 if (!dev) 2869 return -ENOBUFS; 2870 return dev_open(dev, NULL); 2871 } 2872 2873 /* 2874 * Set destination address. 2875 * Special case for SIT interfaces where we create a new "virtual" 2876 * device. 2877 */ 2878 int addrconf_set_dstaddr(struct net *net, void __user *arg) 2879 { 2880 struct net_device *dev; 2881 struct in6_ifreq ireq; 2882 int err = -ENODEV; 2883 2884 if (!IS_ENABLED(CONFIG_IPV6_SIT)) 2885 return -ENODEV; 2886 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2887 return -EFAULT; 2888 2889 rtnl_lock(); 2890 dev = __dev_get_by_index(net, ireq.ifr6_ifindex); 2891 if (dev && dev->type == ARPHRD_SIT) 2892 err = addrconf_set_sit_dstaddr(net, dev, &ireq); 2893 rtnl_unlock(); 2894 return err; 2895 } 2896 2897 static int ipv6_mc_config(struct sock *sk, bool join, 2898 const struct in6_addr *addr, int ifindex) 2899 { 2900 int ret; 2901 2902 ASSERT_RTNL(); 2903 2904 lock_sock(sk); 2905 if (join) 2906 ret = ipv6_sock_mc_join(sk, ifindex, addr); 2907 else 2908 ret = ipv6_sock_mc_drop(sk, ifindex, addr); 2909 release_sock(sk); 2910 2911 return ret; 2912 } 2913 2914 /* 2915 * Manual configuration of address on an interface 2916 */ 2917 static int inet6_addr_add(struct net *net, int ifindex, 2918 struct ifa6_config *cfg, 2919 struct netlink_ext_ack *extack) 2920 { 2921 struct inet6_ifaddr *ifp; 2922 struct inet6_dev *idev; 2923 struct net_device *dev; 2924 unsigned long timeout; 2925 clock_t expires; 2926 u32 flags; 2927 2928 ASSERT_RTNL(); 2929 2930 if (cfg->plen > 128) 2931 return -EINVAL; 2932 2933 /* check the lifetime */ 2934 if (!cfg->valid_lft || cfg->preferred_lft > cfg->valid_lft) 2935 return -EINVAL; 2936 2937 if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR && cfg->plen != 64) 2938 return -EINVAL; 2939 2940 dev = __dev_get_by_index(net, ifindex); 2941 if (!dev) 2942 return -ENODEV; 2943 2944 idev = addrconf_add_dev(dev); 2945 if (IS_ERR(idev)) 2946 return PTR_ERR(idev); 2947 2948 if (cfg->ifa_flags & IFA_F_MCAUTOJOIN) { 2949 int ret = ipv6_mc_config(net->ipv6.mc_autojoin_sk, 2950 true, cfg->pfx, ifindex); 2951 2952 if (ret < 0) 2953 return ret; 2954 } 2955 2956 cfg->scope = ipv6_addr_scope(cfg->pfx); 2957 2958 timeout = addrconf_timeout_fixup(cfg->valid_lft, HZ); 2959 if (addrconf_finite_timeout(timeout)) { 2960 expires = jiffies_to_clock_t(timeout * HZ); 2961 cfg->valid_lft = timeout; 2962 flags = RTF_EXPIRES; 2963 } else { 2964 expires = 0; 2965 flags = 0; 2966 cfg->ifa_flags |= IFA_F_PERMANENT; 2967 } 2968 2969 timeout = addrconf_timeout_fixup(cfg->preferred_lft, HZ); 2970 if (addrconf_finite_timeout(timeout)) { 2971 if (timeout == 0) 2972 cfg->ifa_flags |= IFA_F_DEPRECATED; 2973 cfg->preferred_lft = timeout; 2974 } 2975 2976 ifp = ipv6_add_addr(idev, cfg, true, extack); 2977 if (!IS_ERR(ifp)) { 2978 if (!(cfg->ifa_flags & IFA_F_NOPREFIXROUTE)) { 2979 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, 2980 ifp->rt_priority, dev, expires, 2981 flags, GFP_KERNEL); 2982 } 2983 2984 /* Send a netlink notification if DAD is enabled and 2985 * optimistic flag is not set 2986 */ 2987 if (!(ifp->flags & (IFA_F_OPTIMISTIC | IFA_F_NODAD))) 2988 ipv6_ifa_notify(0, ifp); 2989 /* 2990 * Note that section 3.1 of RFC 4429 indicates 2991 * that the Optimistic flag should not be set for 2992 * manually configured addresses 2993 */ 2994 addrconf_dad_start(ifp); 2995 if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR) 2996 manage_tempaddrs(idev, ifp, cfg->valid_lft, 2997 cfg->preferred_lft, true, jiffies); 2998 in6_ifa_put(ifp); 2999 addrconf_verify_rtnl(net); 3000 return 0; 3001 } else if (cfg->ifa_flags & IFA_F_MCAUTOJOIN) { 3002 ipv6_mc_config(net->ipv6.mc_autojoin_sk, false, 3003 cfg->pfx, ifindex); 3004 } 3005 3006 return PTR_ERR(ifp); 3007 } 3008 3009 static int inet6_addr_del(struct net *net, int ifindex, u32 ifa_flags, 3010 const struct in6_addr *pfx, unsigned int plen) 3011 { 3012 struct inet6_ifaddr *ifp; 3013 struct inet6_dev *idev; 3014 struct net_device *dev; 3015 3016 if (plen > 128) 3017 return -EINVAL; 3018 3019 dev = __dev_get_by_index(net, ifindex); 3020 if (!dev) 3021 return -ENODEV; 3022 3023 idev = __in6_dev_get(dev); 3024 if (!idev) 3025 return -ENXIO; 3026 3027 read_lock_bh(&idev->lock); 3028 list_for_each_entry(ifp, &idev->addr_list, if_list) { 3029 if (ifp->prefix_len == plen && 3030 ipv6_addr_equal(pfx, &ifp->addr)) { 3031 in6_ifa_hold(ifp); 3032 read_unlock_bh(&idev->lock); 3033 3034 if (!(ifp->flags & IFA_F_TEMPORARY) && 3035 (ifa_flags & IFA_F_MANAGETEMPADDR)) 3036 manage_tempaddrs(idev, ifp, 0, 0, false, 3037 jiffies); 3038 ipv6_del_addr(ifp); 3039 addrconf_verify_rtnl(net); 3040 if (ipv6_addr_is_multicast(pfx)) { 3041 ipv6_mc_config(net->ipv6.mc_autojoin_sk, 3042 false, pfx, dev->ifindex); 3043 } 3044 return 0; 3045 } 3046 } 3047 read_unlock_bh(&idev->lock); 3048 return -EADDRNOTAVAIL; 3049 } 3050 3051 3052 int addrconf_add_ifaddr(struct net *net, void __user *arg) 3053 { 3054 struct ifa6_config cfg = { 3055 .ifa_flags = IFA_F_PERMANENT, 3056 .preferred_lft = INFINITY_LIFE_TIME, 3057 .valid_lft = INFINITY_LIFE_TIME, 3058 }; 3059 struct in6_ifreq ireq; 3060 int err; 3061 3062 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 3063 return -EPERM; 3064 3065 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 3066 return -EFAULT; 3067 3068 cfg.pfx = &ireq.ifr6_addr; 3069 cfg.plen = ireq.ifr6_prefixlen; 3070 3071 rtnl_lock(); 3072 err = inet6_addr_add(net, ireq.ifr6_ifindex, &cfg, NULL); 3073 rtnl_unlock(); 3074 return err; 3075 } 3076 3077 int addrconf_del_ifaddr(struct net *net, void __user *arg) 3078 { 3079 struct in6_ifreq ireq; 3080 int err; 3081 3082 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 3083 return -EPERM; 3084 3085 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 3086 return -EFAULT; 3087 3088 rtnl_lock(); 3089 err = inet6_addr_del(net, ireq.ifr6_ifindex, 0, &ireq.ifr6_addr, 3090 ireq.ifr6_prefixlen); 3091 rtnl_unlock(); 3092 return err; 3093 } 3094 3095 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr, 3096 int plen, int scope, u8 proto) 3097 { 3098 struct inet6_ifaddr *ifp; 3099 struct ifa6_config cfg = { 3100 .pfx = addr, 3101 .plen = plen, 3102 .ifa_flags = IFA_F_PERMANENT, 3103 .valid_lft = INFINITY_LIFE_TIME, 3104 .preferred_lft = INFINITY_LIFE_TIME, 3105 .scope = scope, 3106 .ifa_proto = proto 3107 }; 3108 3109 ifp = ipv6_add_addr(idev, &cfg, true, NULL); 3110 if (!IS_ERR(ifp)) { 3111 spin_lock_bh(&ifp->lock); 3112 ifp->flags &= ~IFA_F_TENTATIVE; 3113 spin_unlock_bh(&ifp->lock); 3114 rt_genid_bump_ipv6(dev_net(idev->dev)); 3115 ipv6_ifa_notify(RTM_NEWADDR, ifp); 3116 in6_ifa_put(ifp); 3117 } 3118 } 3119 3120 #if IS_ENABLED(CONFIG_IPV6_SIT) || IS_ENABLED(CONFIG_NET_IPGRE) || IS_ENABLED(CONFIG_IPV6_GRE) 3121 static void add_v4_addrs(struct inet6_dev *idev) 3122 { 3123 struct in6_addr addr; 3124 struct net_device *dev; 3125 struct net *net = dev_net(idev->dev); 3126 int scope, plen, offset = 0; 3127 u32 pflags = 0; 3128 3129 ASSERT_RTNL(); 3130 3131 memset(&addr, 0, sizeof(struct in6_addr)); 3132 /* in case of IP6GRE the dev_addr is an IPv6 and therefore we use only the last 4 bytes */ 3133 if (idev->dev->addr_len == sizeof(struct in6_addr)) 3134 offset = sizeof(struct in6_addr) - 4; 3135 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr + offset, 4); 3136 3137 if (!(idev->dev->flags & IFF_POINTOPOINT) && idev->dev->type == ARPHRD_SIT) { 3138 scope = IPV6_ADDR_COMPATv4; 3139 plen = 96; 3140 pflags |= RTF_NONEXTHOP; 3141 } else { 3142 if (idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_NONE) 3143 return; 3144 3145 addr.s6_addr32[0] = htonl(0xfe800000); 3146 scope = IFA_LINK; 3147 plen = 64; 3148 } 3149 3150 if (addr.s6_addr32[3]) { 3151 add_addr(idev, &addr, plen, scope, IFAPROT_UNSPEC); 3152 addrconf_prefix_route(&addr, plen, 0, idev->dev, 0, pflags, 3153 GFP_KERNEL); 3154 return; 3155 } 3156 3157 for_each_netdev(net, dev) { 3158 struct in_device *in_dev = __in_dev_get_rtnl(dev); 3159 if (in_dev && (dev->flags & IFF_UP)) { 3160 struct in_ifaddr *ifa; 3161 int flag = scope; 3162 3163 in_dev_for_each_ifa_rtnl(ifa, in_dev) { 3164 addr.s6_addr32[3] = ifa->ifa_local; 3165 3166 if (ifa->ifa_scope == RT_SCOPE_LINK) 3167 continue; 3168 if (ifa->ifa_scope >= RT_SCOPE_HOST) { 3169 if (idev->dev->flags&IFF_POINTOPOINT) 3170 continue; 3171 flag |= IFA_HOST; 3172 } 3173 3174 add_addr(idev, &addr, plen, flag, 3175 IFAPROT_UNSPEC); 3176 addrconf_prefix_route(&addr, plen, 0, idev->dev, 3177 0, pflags, GFP_KERNEL); 3178 } 3179 } 3180 } 3181 } 3182 #endif 3183 3184 static void init_loopback(struct net_device *dev) 3185 { 3186 struct inet6_dev *idev; 3187 3188 /* ::1 */ 3189 3190 ASSERT_RTNL(); 3191 3192 idev = ipv6_find_idev(dev); 3193 if (IS_ERR(idev)) { 3194 pr_debug("%s: add_dev failed\n", __func__); 3195 return; 3196 } 3197 3198 add_addr(idev, &in6addr_loopback, 128, IFA_HOST, IFAPROT_KERNEL_LO); 3199 } 3200 3201 void addrconf_add_linklocal(struct inet6_dev *idev, 3202 const struct in6_addr *addr, u32 flags) 3203 { 3204 struct ifa6_config cfg = { 3205 .pfx = addr, 3206 .plen = 64, 3207 .ifa_flags = flags | IFA_F_PERMANENT, 3208 .valid_lft = INFINITY_LIFE_TIME, 3209 .preferred_lft = INFINITY_LIFE_TIME, 3210 .scope = IFA_LINK, 3211 .ifa_proto = IFAPROT_KERNEL_LL 3212 }; 3213 struct inet6_ifaddr *ifp; 3214 3215 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 3216 if ((dev_net(idev->dev)->ipv6.devconf_all->optimistic_dad || 3217 idev->cnf.optimistic_dad) && 3218 !dev_net(idev->dev)->ipv6.devconf_all->forwarding) 3219 cfg.ifa_flags |= IFA_F_OPTIMISTIC; 3220 #endif 3221 3222 ifp = ipv6_add_addr(idev, &cfg, true, NULL); 3223 if (!IS_ERR(ifp)) { 3224 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, 0, idev->dev, 3225 0, 0, GFP_ATOMIC); 3226 addrconf_dad_start(ifp); 3227 in6_ifa_put(ifp); 3228 } 3229 } 3230 EXPORT_SYMBOL_GPL(addrconf_add_linklocal); 3231 3232 static bool ipv6_reserved_interfaceid(struct in6_addr address) 3233 { 3234 if ((address.s6_addr32[2] | address.s6_addr32[3]) == 0) 3235 return true; 3236 3237 if (address.s6_addr32[2] == htonl(0x02005eff) && 3238 ((address.s6_addr32[3] & htonl(0xfe000000)) == htonl(0xfe000000))) 3239 return true; 3240 3241 if (address.s6_addr32[2] == htonl(0xfdffffff) && 3242 ((address.s6_addr32[3] & htonl(0xffffff80)) == htonl(0xffffff80))) 3243 return true; 3244 3245 return false; 3246 } 3247 3248 static int ipv6_generate_stable_address(struct in6_addr *address, 3249 u8 dad_count, 3250 const struct inet6_dev *idev) 3251 { 3252 static DEFINE_SPINLOCK(lock); 3253 static __u32 digest[SHA1_DIGEST_WORDS]; 3254 static __u32 workspace[SHA1_WORKSPACE_WORDS]; 3255 3256 static union { 3257 char __data[SHA1_BLOCK_SIZE]; 3258 struct { 3259 struct in6_addr secret; 3260 __be32 prefix[2]; 3261 unsigned char hwaddr[MAX_ADDR_LEN]; 3262 u8 dad_count; 3263 } __packed; 3264 } data; 3265 3266 struct in6_addr secret; 3267 struct in6_addr temp; 3268 struct net *net = dev_net(idev->dev); 3269 3270 BUILD_BUG_ON(sizeof(data.__data) != sizeof(data)); 3271 3272 if (idev->cnf.stable_secret.initialized) 3273 secret = idev->cnf.stable_secret.secret; 3274 else if (net->ipv6.devconf_dflt->stable_secret.initialized) 3275 secret = net->ipv6.devconf_dflt->stable_secret.secret; 3276 else 3277 return -1; 3278 3279 retry: 3280 spin_lock_bh(&lock); 3281 3282 sha1_init(digest); 3283 memset(&data, 0, sizeof(data)); 3284 memset(workspace, 0, sizeof(workspace)); 3285 memcpy(data.hwaddr, idev->dev->perm_addr, idev->dev->addr_len); 3286 data.prefix[0] = address->s6_addr32[0]; 3287 data.prefix[1] = address->s6_addr32[1]; 3288 data.secret = secret; 3289 data.dad_count = dad_count; 3290 3291 sha1_transform(digest, data.__data, workspace); 3292 3293 temp = *address; 3294 temp.s6_addr32[2] = (__force __be32)digest[0]; 3295 temp.s6_addr32[3] = (__force __be32)digest[1]; 3296 3297 spin_unlock_bh(&lock); 3298 3299 if (ipv6_reserved_interfaceid(temp)) { 3300 dad_count++; 3301 if (dad_count > dev_net(idev->dev)->ipv6.sysctl.idgen_retries) 3302 return -1; 3303 goto retry; 3304 } 3305 3306 *address = temp; 3307 return 0; 3308 } 3309 3310 static void ipv6_gen_mode_random_init(struct inet6_dev *idev) 3311 { 3312 struct ipv6_stable_secret *s = &idev->cnf.stable_secret; 3313 3314 if (s->initialized) 3315 return; 3316 s = &idev->cnf.stable_secret; 3317 get_random_bytes(&s->secret, sizeof(s->secret)); 3318 s->initialized = true; 3319 } 3320 3321 static void addrconf_addr_gen(struct inet6_dev *idev, bool prefix_route) 3322 { 3323 struct in6_addr addr; 3324 3325 /* no link local addresses on L3 master devices */ 3326 if (netif_is_l3_master(idev->dev)) 3327 return; 3328 3329 /* no link local addresses on devices flagged as slaves */ 3330 if (idev->dev->priv_flags & IFF_NO_ADDRCONF) 3331 return; 3332 3333 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0); 3334 3335 switch (idev->cnf.addr_gen_mode) { 3336 case IN6_ADDR_GEN_MODE_RANDOM: 3337 ipv6_gen_mode_random_init(idev); 3338 fallthrough; 3339 case IN6_ADDR_GEN_MODE_STABLE_PRIVACY: 3340 if (!ipv6_generate_stable_address(&addr, 0, idev)) 3341 addrconf_add_linklocal(idev, &addr, 3342 IFA_F_STABLE_PRIVACY); 3343 else if (prefix_route) 3344 addrconf_prefix_route(&addr, 64, 0, idev->dev, 3345 0, 0, GFP_KERNEL); 3346 break; 3347 case IN6_ADDR_GEN_MODE_EUI64: 3348 /* addrconf_add_linklocal also adds a prefix_route and we 3349 * only need to care about prefix routes if ipv6_generate_eui64 3350 * couldn't generate one. 3351 */ 3352 if (ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) == 0) 3353 addrconf_add_linklocal(idev, &addr, 0); 3354 else if (prefix_route) 3355 addrconf_prefix_route(&addr, 64, 0, idev->dev, 3356 0, 0, GFP_KERNEL); 3357 break; 3358 case IN6_ADDR_GEN_MODE_NONE: 3359 default: 3360 /* will not add any link local address */ 3361 break; 3362 } 3363 } 3364 3365 static void addrconf_dev_config(struct net_device *dev) 3366 { 3367 struct inet6_dev *idev; 3368 3369 ASSERT_RTNL(); 3370 3371 if ((dev->type != ARPHRD_ETHER) && 3372 (dev->type != ARPHRD_FDDI) && 3373 (dev->type != ARPHRD_ARCNET) && 3374 (dev->type != ARPHRD_INFINIBAND) && 3375 (dev->type != ARPHRD_IEEE1394) && 3376 (dev->type != ARPHRD_TUNNEL6) && 3377 (dev->type != ARPHRD_6LOWPAN) && 3378 (dev->type != ARPHRD_TUNNEL) && 3379 (dev->type != ARPHRD_NONE) && 3380 (dev->type != ARPHRD_RAWIP)) { 3381 /* Alas, we support only Ethernet autoconfiguration. */ 3382 idev = __in6_dev_get(dev); 3383 if (!IS_ERR_OR_NULL(idev) && dev->flags & IFF_UP && 3384 dev->flags & IFF_MULTICAST) 3385 ipv6_mc_up(idev); 3386 return; 3387 } 3388 3389 idev = addrconf_add_dev(dev); 3390 if (IS_ERR(idev)) 3391 return; 3392 3393 /* this device type has no EUI support */ 3394 if (dev->type == ARPHRD_NONE && 3395 idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_EUI64) 3396 idev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_RANDOM; 3397 3398 addrconf_addr_gen(idev, false); 3399 } 3400 3401 #if IS_ENABLED(CONFIG_IPV6_SIT) 3402 static void addrconf_sit_config(struct net_device *dev) 3403 { 3404 struct inet6_dev *idev; 3405 3406 ASSERT_RTNL(); 3407 3408 /* 3409 * Configure the tunnel with one of our IPv4 3410 * addresses... we should configure all of 3411 * our v4 addrs in the tunnel 3412 */ 3413 3414 idev = ipv6_find_idev(dev); 3415 if (IS_ERR(idev)) { 3416 pr_debug("%s: add_dev failed\n", __func__); 3417 return; 3418 } 3419 3420 if (dev->priv_flags & IFF_ISATAP) { 3421 addrconf_addr_gen(idev, false); 3422 return; 3423 } 3424 3425 add_v4_addrs(idev); 3426 3427 if (dev->flags&IFF_POINTOPOINT) 3428 addrconf_add_mroute(dev); 3429 } 3430 #endif 3431 3432 #if IS_ENABLED(CONFIG_NET_IPGRE) || IS_ENABLED(CONFIG_IPV6_GRE) 3433 static void addrconf_gre_config(struct net_device *dev) 3434 { 3435 struct inet6_dev *idev; 3436 3437 ASSERT_RTNL(); 3438 3439 idev = ipv6_find_idev(dev); 3440 if (IS_ERR(idev)) { 3441 pr_debug("%s: add_dev failed\n", __func__); 3442 return; 3443 } 3444 3445 if (dev->type == ARPHRD_ETHER) { 3446 addrconf_addr_gen(idev, true); 3447 return; 3448 } 3449 3450 add_v4_addrs(idev); 3451 3452 if (dev->flags & IFF_POINTOPOINT) 3453 addrconf_add_mroute(dev); 3454 } 3455 #endif 3456 3457 static void addrconf_init_auto_addrs(struct net_device *dev) 3458 { 3459 switch (dev->type) { 3460 #if IS_ENABLED(CONFIG_IPV6_SIT) 3461 case ARPHRD_SIT: 3462 addrconf_sit_config(dev); 3463 break; 3464 #endif 3465 #if IS_ENABLED(CONFIG_NET_IPGRE) || IS_ENABLED(CONFIG_IPV6_GRE) 3466 case ARPHRD_IP6GRE: 3467 case ARPHRD_IPGRE: 3468 addrconf_gre_config(dev); 3469 break; 3470 #endif 3471 case ARPHRD_LOOPBACK: 3472 init_loopback(dev); 3473 break; 3474 3475 default: 3476 addrconf_dev_config(dev); 3477 break; 3478 } 3479 } 3480 3481 static int fixup_permanent_addr(struct net *net, 3482 struct inet6_dev *idev, 3483 struct inet6_ifaddr *ifp) 3484 { 3485 /* !fib6_node means the host route was removed from the 3486 * FIB, for example, if 'lo' device is taken down. In that 3487 * case regenerate the host route. 3488 */ 3489 if (!ifp->rt || !ifp->rt->fib6_node) { 3490 struct fib6_info *f6i, *prev; 3491 3492 f6i = addrconf_f6i_alloc(net, idev, &ifp->addr, false, 3493 GFP_ATOMIC); 3494 if (IS_ERR(f6i)) 3495 return PTR_ERR(f6i); 3496 3497 /* ifp->rt can be accessed outside of rtnl */ 3498 spin_lock(&ifp->lock); 3499 prev = ifp->rt; 3500 ifp->rt = f6i; 3501 spin_unlock(&ifp->lock); 3502 3503 fib6_info_release(prev); 3504 } 3505 3506 if (!(ifp->flags & IFA_F_NOPREFIXROUTE)) { 3507 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, 3508 ifp->rt_priority, idev->dev, 0, 0, 3509 GFP_ATOMIC); 3510 } 3511 3512 if (ifp->state == INET6_IFADDR_STATE_PREDAD) 3513 addrconf_dad_start(ifp); 3514 3515 return 0; 3516 } 3517 3518 static void addrconf_permanent_addr(struct net *net, struct net_device *dev) 3519 { 3520 struct inet6_ifaddr *ifp, *tmp; 3521 struct inet6_dev *idev; 3522 3523 idev = __in6_dev_get(dev); 3524 if (!idev) 3525 return; 3526 3527 write_lock_bh(&idev->lock); 3528 3529 list_for_each_entry_safe(ifp, tmp, &idev->addr_list, if_list) { 3530 if ((ifp->flags & IFA_F_PERMANENT) && 3531 fixup_permanent_addr(net, idev, ifp) < 0) { 3532 write_unlock_bh(&idev->lock); 3533 in6_ifa_hold(ifp); 3534 ipv6_del_addr(ifp); 3535 write_lock_bh(&idev->lock); 3536 3537 net_info_ratelimited("%s: Failed to add prefix route for address %pI6c; dropping\n", 3538 idev->dev->name, &ifp->addr); 3539 } 3540 } 3541 3542 write_unlock_bh(&idev->lock); 3543 } 3544 3545 static int addrconf_notify(struct notifier_block *this, unsigned long event, 3546 void *ptr) 3547 { 3548 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 3549 struct netdev_notifier_change_info *change_info; 3550 struct netdev_notifier_changeupper_info *info; 3551 struct inet6_dev *idev = __in6_dev_get(dev); 3552 struct net *net = dev_net(dev); 3553 int run_pending = 0; 3554 int err; 3555 3556 switch (event) { 3557 case NETDEV_REGISTER: 3558 if (!idev && dev->mtu >= IPV6_MIN_MTU) { 3559 idev = ipv6_add_dev(dev); 3560 if (IS_ERR(idev)) 3561 return notifier_from_errno(PTR_ERR(idev)); 3562 } 3563 break; 3564 3565 case NETDEV_CHANGEMTU: 3566 /* if MTU under IPV6_MIN_MTU stop IPv6 on this interface. */ 3567 if (dev->mtu < IPV6_MIN_MTU) { 3568 addrconf_ifdown(dev, dev != net->loopback_dev); 3569 break; 3570 } 3571 3572 if (idev) { 3573 rt6_mtu_change(dev, dev->mtu); 3574 idev->cnf.mtu6 = dev->mtu; 3575 break; 3576 } 3577 3578 /* allocate new idev */ 3579 idev = ipv6_add_dev(dev); 3580 if (IS_ERR(idev)) 3581 break; 3582 3583 /* device is still not ready */ 3584 if (!(idev->if_flags & IF_READY)) 3585 break; 3586 3587 run_pending = 1; 3588 fallthrough; 3589 case NETDEV_UP: 3590 case NETDEV_CHANGE: 3591 if (idev && idev->cnf.disable_ipv6) 3592 break; 3593 3594 if (dev->priv_flags & IFF_NO_ADDRCONF) { 3595 if (event == NETDEV_UP && !IS_ERR_OR_NULL(idev) && 3596 dev->flags & IFF_UP && dev->flags & IFF_MULTICAST) 3597 ipv6_mc_up(idev); 3598 break; 3599 } 3600 3601 if (event == NETDEV_UP) { 3602 /* restore routes for permanent addresses */ 3603 addrconf_permanent_addr(net, dev); 3604 3605 if (!addrconf_link_ready(dev)) { 3606 /* device is not ready yet. */ 3607 pr_debug("ADDRCONF(NETDEV_UP): %s: link is not ready\n", 3608 dev->name); 3609 break; 3610 } 3611 3612 if (!idev && dev->mtu >= IPV6_MIN_MTU) 3613 idev = ipv6_add_dev(dev); 3614 3615 if (!IS_ERR_OR_NULL(idev)) { 3616 idev->if_flags |= IF_READY; 3617 run_pending = 1; 3618 } 3619 } else if (event == NETDEV_CHANGE) { 3620 if (!addrconf_link_ready(dev)) { 3621 /* device is still not ready. */ 3622 rt6_sync_down_dev(dev, event); 3623 break; 3624 } 3625 3626 if (!IS_ERR_OR_NULL(idev)) { 3627 if (idev->if_flags & IF_READY) { 3628 /* device is already configured - 3629 * but resend MLD reports, we might 3630 * have roamed and need to update 3631 * multicast snooping switches 3632 */ 3633 ipv6_mc_up(idev); 3634 change_info = ptr; 3635 if (change_info->flags_changed & IFF_NOARP) 3636 addrconf_dad_run(idev, true); 3637 rt6_sync_up(dev, RTNH_F_LINKDOWN); 3638 break; 3639 } 3640 idev->if_flags |= IF_READY; 3641 } 3642 3643 pr_debug("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n", 3644 dev->name); 3645 3646 run_pending = 1; 3647 } 3648 3649 addrconf_init_auto_addrs(dev); 3650 3651 if (!IS_ERR_OR_NULL(idev)) { 3652 if (run_pending) 3653 addrconf_dad_run(idev, false); 3654 3655 /* Device has an address by now */ 3656 rt6_sync_up(dev, RTNH_F_DEAD); 3657 3658 /* 3659 * If the MTU changed during the interface down, 3660 * when the interface up, the changed MTU must be 3661 * reflected in the idev as well as routers. 3662 */ 3663 if (idev->cnf.mtu6 != dev->mtu && 3664 dev->mtu >= IPV6_MIN_MTU) { 3665 rt6_mtu_change(dev, dev->mtu); 3666 idev->cnf.mtu6 = dev->mtu; 3667 } 3668 idev->tstamp = jiffies; 3669 inet6_ifinfo_notify(RTM_NEWLINK, idev); 3670 3671 /* 3672 * If the changed mtu during down is lower than 3673 * IPV6_MIN_MTU stop IPv6 on this interface. 3674 */ 3675 if (dev->mtu < IPV6_MIN_MTU) 3676 addrconf_ifdown(dev, dev != net->loopback_dev); 3677 } 3678 break; 3679 3680 case NETDEV_DOWN: 3681 case NETDEV_UNREGISTER: 3682 /* 3683 * Remove all addresses from this interface. 3684 */ 3685 addrconf_ifdown(dev, event != NETDEV_DOWN); 3686 break; 3687 3688 case NETDEV_CHANGENAME: 3689 if (idev) { 3690 snmp6_unregister_dev(idev); 3691 addrconf_sysctl_unregister(idev); 3692 err = addrconf_sysctl_register(idev); 3693 if (err) 3694 return notifier_from_errno(err); 3695 err = snmp6_register_dev(idev); 3696 if (err) { 3697 addrconf_sysctl_unregister(idev); 3698 return notifier_from_errno(err); 3699 } 3700 } 3701 break; 3702 3703 case NETDEV_PRE_TYPE_CHANGE: 3704 case NETDEV_POST_TYPE_CHANGE: 3705 if (idev) 3706 addrconf_type_change(dev, event); 3707 break; 3708 3709 case NETDEV_CHANGEUPPER: 3710 info = ptr; 3711 3712 /* flush all routes if dev is linked to or unlinked from 3713 * an L3 master device (e.g., VRF) 3714 */ 3715 if (info->upper_dev && netif_is_l3_master(info->upper_dev)) 3716 addrconf_ifdown(dev, false); 3717 } 3718 3719 return NOTIFY_OK; 3720 } 3721 3722 /* 3723 * addrconf module should be notified of a device going up 3724 */ 3725 static struct notifier_block ipv6_dev_notf = { 3726 .notifier_call = addrconf_notify, 3727 .priority = ADDRCONF_NOTIFY_PRIORITY, 3728 }; 3729 3730 static void addrconf_type_change(struct net_device *dev, unsigned long event) 3731 { 3732 struct inet6_dev *idev; 3733 ASSERT_RTNL(); 3734 3735 idev = __in6_dev_get(dev); 3736 3737 if (event == NETDEV_POST_TYPE_CHANGE) 3738 ipv6_mc_remap(idev); 3739 else if (event == NETDEV_PRE_TYPE_CHANGE) 3740 ipv6_mc_unmap(idev); 3741 } 3742 3743 static bool addr_is_local(const struct in6_addr *addr) 3744 { 3745 return ipv6_addr_type(addr) & 3746 (IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK); 3747 } 3748 3749 static int addrconf_ifdown(struct net_device *dev, bool unregister) 3750 { 3751 unsigned long event = unregister ? NETDEV_UNREGISTER : NETDEV_DOWN; 3752 struct net *net = dev_net(dev); 3753 struct inet6_dev *idev; 3754 struct inet6_ifaddr *ifa; 3755 LIST_HEAD(tmp_addr_list); 3756 bool keep_addr = false; 3757 bool was_ready; 3758 int state, i; 3759 3760 ASSERT_RTNL(); 3761 3762 rt6_disable_ip(dev, event); 3763 3764 idev = __in6_dev_get(dev); 3765 if (!idev) 3766 return -ENODEV; 3767 3768 /* 3769 * Step 1: remove reference to ipv6 device from parent device. 3770 * Do not dev_put! 3771 */ 3772 if (unregister) { 3773 idev->dead = 1; 3774 3775 /* protected by rtnl_lock */ 3776 RCU_INIT_POINTER(dev->ip6_ptr, NULL); 3777 3778 /* Step 1.5: remove snmp6 entry */ 3779 snmp6_unregister_dev(idev); 3780 3781 } 3782 3783 /* combine the user config with event to determine if permanent 3784 * addresses are to be removed from address hash table 3785 */ 3786 if (!unregister && !idev->cnf.disable_ipv6) { 3787 /* aggregate the system setting and interface setting */ 3788 int _keep_addr = net->ipv6.devconf_all->keep_addr_on_down; 3789 3790 if (!_keep_addr) 3791 _keep_addr = idev->cnf.keep_addr_on_down; 3792 3793 keep_addr = (_keep_addr > 0); 3794 } 3795 3796 /* Step 2: clear hash table */ 3797 for (i = 0; i < IN6_ADDR_HSIZE; i++) { 3798 struct hlist_head *h = &net->ipv6.inet6_addr_lst[i]; 3799 3800 spin_lock_bh(&net->ipv6.addrconf_hash_lock); 3801 restart: 3802 hlist_for_each_entry_rcu(ifa, h, addr_lst) { 3803 if (ifa->idev == idev) { 3804 addrconf_del_dad_work(ifa); 3805 /* combined flag + permanent flag decide if 3806 * address is retained on a down event 3807 */ 3808 if (!keep_addr || 3809 !(ifa->flags & IFA_F_PERMANENT) || 3810 addr_is_local(&ifa->addr)) { 3811 hlist_del_init_rcu(&ifa->addr_lst); 3812 goto restart; 3813 } 3814 } 3815 } 3816 spin_unlock_bh(&net->ipv6.addrconf_hash_lock); 3817 } 3818 3819 write_lock_bh(&idev->lock); 3820 3821 addrconf_del_rs_timer(idev); 3822 3823 /* Step 2: clear flags for stateless addrconf, repeated down 3824 * detection 3825 */ 3826 was_ready = idev->if_flags & IF_READY; 3827 if (!unregister) 3828 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY); 3829 3830 /* Step 3: clear tempaddr list */ 3831 while (!list_empty(&idev->tempaddr_list)) { 3832 ifa = list_first_entry(&idev->tempaddr_list, 3833 struct inet6_ifaddr, tmp_list); 3834 list_del(&ifa->tmp_list); 3835 write_unlock_bh(&idev->lock); 3836 spin_lock_bh(&ifa->lock); 3837 3838 if (ifa->ifpub) { 3839 in6_ifa_put(ifa->ifpub); 3840 ifa->ifpub = NULL; 3841 } 3842 spin_unlock_bh(&ifa->lock); 3843 in6_ifa_put(ifa); 3844 write_lock_bh(&idev->lock); 3845 } 3846 3847 list_for_each_entry(ifa, &idev->addr_list, if_list) 3848 list_add_tail(&ifa->if_list_aux, &tmp_addr_list); 3849 write_unlock_bh(&idev->lock); 3850 3851 while (!list_empty(&tmp_addr_list)) { 3852 struct fib6_info *rt = NULL; 3853 bool keep; 3854 3855 ifa = list_first_entry(&tmp_addr_list, 3856 struct inet6_ifaddr, if_list_aux); 3857 list_del(&ifa->if_list_aux); 3858 3859 addrconf_del_dad_work(ifa); 3860 3861 keep = keep_addr && (ifa->flags & IFA_F_PERMANENT) && 3862 !addr_is_local(&ifa->addr); 3863 3864 spin_lock_bh(&ifa->lock); 3865 3866 if (keep) { 3867 /* set state to skip the notifier below */ 3868 state = INET6_IFADDR_STATE_DEAD; 3869 ifa->state = INET6_IFADDR_STATE_PREDAD; 3870 if (!(ifa->flags & IFA_F_NODAD)) 3871 ifa->flags |= IFA_F_TENTATIVE; 3872 3873 rt = ifa->rt; 3874 ifa->rt = NULL; 3875 } else { 3876 state = ifa->state; 3877 ifa->state = INET6_IFADDR_STATE_DEAD; 3878 } 3879 3880 spin_unlock_bh(&ifa->lock); 3881 3882 if (rt) 3883 ip6_del_rt(net, rt, false); 3884 3885 if (state != INET6_IFADDR_STATE_DEAD) { 3886 __ipv6_ifa_notify(RTM_DELADDR, ifa); 3887 inet6addr_notifier_call_chain(NETDEV_DOWN, ifa); 3888 } else { 3889 if (idev->cnf.forwarding) 3890 addrconf_leave_anycast(ifa); 3891 addrconf_leave_solict(ifa->idev, &ifa->addr); 3892 } 3893 3894 if (!keep) { 3895 write_lock_bh(&idev->lock); 3896 list_del_rcu(&ifa->if_list); 3897 write_unlock_bh(&idev->lock); 3898 in6_ifa_put(ifa); 3899 } 3900 } 3901 3902 /* Step 5: Discard anycast and multicast list */ 3903 if (unregister) { 3904 ipv6_ac_destroy_dev(idev); 3905 ipv6_mc_destroy_dev(idev); 3906 } else if (was_ready) { 3907 ipv6_mc_down(idev); 3908 } 3909 3910 idev->tstamp = jiffies; 3911 idev->ra_mtu = 0; 3912 3913 /* Last: Shot the device (if unregistered) */ 3914 if (unregister) { 3915 addrconf_sysctl_unregister(idev); 3916 neigh_parms_release(&nd_tbl, idev->nd_parms); 3917 neigh_ifdown(&nd_tbl, dev); 3918 in6_dev_put(idev); 3919 } 3920 return 0; 3921 } 3922 3923 static void addrconf_rs_timer(struct timer_list *t) 3924 { 3925 struct inet6_dev *idev = from_timer(idev, t, rs_timer); 3926 struct net_device *dev = idev->dev; 3927 struct in6_addr lladdr; 3928 3929 write_lock(&idev->lock); 3930 if (idev->dead || !(idev->if_flags & IF_READY)) 3931 goto out; 3932 3933 if (!ipv6_accept_ra(idev)) 3934 goto out; 3935 3936 /* Announcement received after solicitation was sent */ 3937 if (idev->if_flags & IF_RA_RCVD) 3938 goto out; 3939 3940 if (idev->rs_probes++ < idev->cnf.rtr_solicits || idev->cnf.rtr_solicits < 0) { 3941 write_unlock(&idev->lock); 3942 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE)) 3943 ndisc_send_rs(dev, &lladdr, 3944 &in6addr_linklocal_allrouters); 3945 else 3946 goto put; 3947 3948 write_lock(&idev->lock); 3949 idev->rs_interval = rfc3315_s14_backoff_update( 3950 idev->rs_interval, idev->cnf.rtr_solicit_max_interval); 3951 /* The wait after the last probe can be shorter */ 3952 addrconf_mod_rs_timer(idev, (idev->rs_probes == 3953 idev->cnf.rtr_solicits) ? 3954 idev->cnf.rtr_solicit_delay : 3955 idev->rs_interval); 3956 } else { 3957 /* 3958 * Note: we do not support deprecated "all on-link" 3959 * assumption any longer. 3960 */ 3961 pr_debug("%s: no IPv6 routers present\n", idev->dev->name); 3962 } 3963 3964 out: 3965 write_unlock(&idev->lock); 3966 put: 3967 in6_dev_put(idev); 3968 } 3969 3970 /* 3971 * Duplicate Address Detection 3972 */ 3973 static void addrconf_dad_kick(struct inet6_ifaddr *ifp) 3974 { 3975 unsigned long rand_num; 3976 struct inet6_dev *idev = ifp->idev; 3977 u64 nonce; 3978 3979 if (ifp->flags & IFA_F_OPTIMISTIC) 3980 rand_num = 0; 3981 else 3982 rand_num = get_random_u32_below(idev->cnf.rtr_solicit_delay ? : 1); 3983 3984 nonce = 0; 3985 if (idev->cnf.enhanced_dad || 3986 dev_net(idev->dev)->ipv6.devconf_all->enhanced_dad) { 3987 do 3988 get_random_bytes(&nonce, 6); 3989 while (nonce == 0); 3990 } 3991 ifp->dad_nonce = nonce; 3992 ifp->dad_probes = idev->cnf.dad_transmits; 3993 addrconf_mod_dad_work(ifp, rand_num); 3994 } 3995 3996 static void addrconf_dad_begin(struct inet6_ifaddr *ifp) 3997 { 3998 struct inet6_dev *idev = ifp->idev; 3999 struct net_device *dev = idev->dev; 4000 bool bump_id, notify = false; 4001 struct net *net; 4002 4003 addrconf_join_solict(dev, &ifp->addr); 4004 4005 read_lock_bh(&idev->lock); 4006 spin_lock(&ifp->lock); 4007 if (ifp->state == INET6_IFADDR_STATE_DEAD) 4008 goto out; 4009 4010 net = dev_net(dev); 4011 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) || 4012 (net->ipv6.devconf_all->accept_dad < 1 && 4013 idev->cnf.accept_dad < 1) || 4014 !(ifp->flags&IFA_F_TENTATIVE) || 4015 ifp->flags & IFA_F_NODAD) { 4016 bool send_na = false; 4017 4018 if (ifp->flags & IFA_F_TENTATIVE && 4019 !(ifp->flags & IFA_F_OPTIMISTIC)) 4020 send_na = true; 4021 bump_id = ifp->flags & IFA_F_TENTATIVE; 4022 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED); 4023 spin_unlock(&ifp->lock); 4024 read_unlock_bh(&idev->lock); 4025 4026 addrconf_dad_completed(ifp, bump_id, send_na); 4027 return; 4028 } 4029 4030 if (!(idev->if_flags & IF_READY)) { 4031 spin_unlock(&ifp->lock); 4032 read_unlock_bh(&idev->lock); 4033 /* 4034 * If the device is not ready: 4035 * - keep it tentative if it is a permanent address. 4036 * - otherwise, kill it. 4037 */ 4038 in6_ifa_hold(ifp); 4039 addrconf_dad_stop(ifp, 0); 4040 return; 4041 } 4042 4043 /* 4044 * Optimistic nodes can start receiving 4045 * Frames right away 4046 */ 4047 if (ifp->flags & IFA_F_OPTIMISTIC) { 4048 ip6_ins_rt(net, ifp->rt); 4049 if (ipv6_use_optimistic_addr(net, idev)) { 4050 /* Because optimistic nodes can use this address, 4051 * notify listeners. If DAD fails, RTM_DELADDR is sent. 4052 */ 4053 notify = true; 4054 } 4055 } 4056 4057 addrconf_dad_kick(ifp); 4058 out: 4059 spin_unlock(&ifp->lock); 4060 read_unlock_bh(&idev->lock); 4061 if (notify) 4062 ipv6_ifa_notify(RTM_NEWADDR, ifp); 4063 } 4064 4065 static void addrconf_dad_start(struct inet6_ifaddr *ifp) 4066 { 4067 bool begin_dad = false; 4068 4069 spin_lock_bh(&ifp->lock); 4070 if (ifp->state != INET6_IFADDR_STATE_DEAD) { 4071 ifp->state = INET6_IFADDR_STATE_PREDAD; 4072 begin_dad = true; 4073 } 4074 spin_unlock_bh(&ifp->lock); 4075 4076 if (begin_dad) 4077 addrconf_mod_dad_work(ifp, 0); 4078 } 4079 4080 static void addrconf_dad_work(struct work_struct *w) 4081 { 4082 struct inet6_ifaddr *ifp = container_of(to_delayed_work(w), 4083 struct inet6_ifaddr, 4084 dad_work); 4085 struct inet6_dev *idev = ifp->idev; 4086 bool bump_id, disable_ipv6 = false; 4087 struct in6_addr mcaddr; 4088 4089 enum { 4090 DAD_PROCESS, 4091 DAD_BEGIN, 4092 DAD_ABORT, 4093 } action = DAD_PROCESS; 4094 4095 rtnl_lock(); 4096 4097 spin_lock_bh(&ifp->lock); 4098 if (ifp->state == INET6_IFADDR_STATE_PREDAD) { 4099 action = DAD_BEGIN; 4100 ifp->state = INET6_IFADDR_STATE_DAD; 4101 } else if (ifp->state == INET6_IFADDR_STATE_ERRDAD) { 4102 action = DAD_ABORT; 4103 ifp->state = INET6_IFADDR_STATE_POSTDAD; 4104 4105 if ((dev_net(idev->dev)->ipv6.devconf_all->accept_dad > 1 || 4106 idev->cnf.accept_dad > 1) && 4107 !idev->cnf.disable_ipv6 && 4108 !(ifp->flags & IFA_F_STABLE_PRIVACY)) { 4109 struct in6_addr addr; 4110 4111 addr.s6_addr32[0] = htonl(0xfe800000); 4112 addr.s6_addr32[1] = 0; 4113 4114 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) && 4115 ipv6_addr_equal(&ifp->addr, &addr)) { 4116 /* DAD failed for link-local based on MAC */ 4117 idev->cnf.disable_ipv6 = 1; 4118 4119 pr_info("%s: IPv6 being disabled!\n", 4120 ifp->idev->dev->name); 4121 disable_ipv6 = true; 4122 } 4123 } 4124 } 4125 spin_unlock_bh(&ifp->lock); 4126 4127 if (action == DAD_BEGIN) { 4128 addrconf_dad_begin(ifp); 4129 goto out; 4130 } else if (action == DAD_ABORT) { 4131 in6_ifa_hold(ifp); 4132 addrconf_dad_stop(ifp, 1); 4133 if (disable_ipv6) 4134 addrconf_ifdown(idev->dev, false); 4135 goto out; 4136 } 4137 4138 if (!ifp->dad_probes && addrconf_dad_end(ifp)) 4139 goto out; 4140 4141 write_lock_bh(&idev->lock); 4142 if (idev->dead || !(idev->if_flags & IF_READY)) { 4143 write_unlock_bh(&idev->lock); 4144 goto out; 4145 } 4146 4147 spin_lock(&ifp->lock); 4148 if (ifp->state == INET6_IFADDR_STATE_DEAD) { 4149 spin_unlock(&ifp->lock); 4150 write_unlock_bh(&idev->lock); 4151 goto out; 4152 } 4153 4154 if (ifp->dad_probes == 0) { 4155 bool send_na = false; 4156 4157 /* 4158 * DAD was successful 4159 */ 4160 4161 if (ifp->flags & IFA_F_TENTATIVE && 4162 !(ifp->flags & IFA_F_OPTIMISTIC)) 4163 send_na = true; 4164 bump_id = ifp->flags & IFA_F_TENTATIVE; 4165 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED); 4166 spin_unlock(&ifp->lock); 4167 write_unlock_bh(&idev->lock); 4168 4169 addrconf_dad_completed(ifp, bump_id, send_na); 4170 4171 goto out; 4172 } 4173 4174 ifp->dad_probes--; 4175 addrconf_mod_dad_work(ifp, 4176 max(NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME), 4177 HZ/100)); 4178 spin_unlock(&ifp->lock); 4179 write_unlock_bh(&idev->lock); 4180 4181 /* send a neighbour solicitation for our addr */ 4182 addrconf_addr_solict_mult(&ifp->addr, &mcaddr); 4183 ndisc_send_ns(ifp->idev->dev, &ifp->addr, &mcaddr, &in6addr_any, 4184 ifp->dad_nonce); 4185 out: 4186 in6_ifa_put(ifp); 4187 rtnl_unlock(); 4188 } 4189 4190 /* ifp->idev must be at least read locked */ 4191 static bool ipv6_lonely_lladdr(struct inet6_ifaddr *ifp) 4192 { 4193 struct inet6_ifaddr *ifpiter; 4194 struct inet6_dev *idev = ifp->idev; 4195 4196 list_for_each_entry_reverse(ifpiter, &idev->addr_list, if_list) { 4197 if (ifpiter->scope > IFA_LINK) 4198 break; 4199 if (ifp != ifpiter && ifpiter->scope == IFA_LINK && 4200 (ifpiter->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE| 4201 IFA_F_OPTIMISTIC|IFA_F_DADFAILED)) == 4202 IFA_F_PERMANENT) 4203 return false; 4204 } 4205 return true; 4206 } 4207 4208 static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id, 4209 bool send_na) 4210 { 4211 struct net_device *dev = ifp->idev->dev; 4212 struct in6_addr lladdr; 4213 bool send_rs, send_mld; 4214 4215 addrconf_del_dad_work(ifp); 4216 4217 /* 4218 * Configure the address for reception. Now it is valid. 4219 */ 4220 4221 ipv6_ifa_notify(RTM_NEWADDR, ifp); 4222 4223 /* If added prefix is link local and we are prepared to process 4224 router advertisements, start sending router solicitations. 4225 */ 4226 4227 read_lock_bh(&ifp->idev->lock); 4228 send_mld = ifp->scope == IFA_LINK && ipv6_lonely_lladdr(ifp); 4229 send_rs = send_mld && 4230 ipv6_accept_ra(ifp->idev) && 4231 ifp->idev->cnf.rtr_solicits != 0 && 4232 (dev->flags & IFF_LOOPBACK) == 0 && 4233 (dev->type != ARPHRD_TUNNEL) && 4234 !netif_is_team_port(dev); 4235 read_unlock_bh(&ifp->idev->lock); 4236 4237 /* While dad is in progress mld report's source address is in6_addrany. 4238 * Resend with proper ll now. 4239 */ 4240 if (send_mld) 4241 ipv6_mc_dad_complete(ifp->idev); 4242 4243 /* send unsolicited NA if enabled */ 4244 if (send_na && 4245 (ifp->idev->cnf.ndisc_notify || 4246 dev_net(dev)->ipv6.devconf_all->ndisc_notify)) { 4247 ndisc_send_na(dev, &in6addr_linklocal_allnodes, &ifp->addr, 4248 /*router=*/ !!ifp->idev->cnf.forwarding, 4249 /*solicited=*/ false, /*override=*/ true, 4250 /*inc_opt=*/ true); 4251 } 4252 4253 if (send_rs) { 4254 /* 4255 * If a host as already performed a random delay 4256 * [...] as part of DAD [...] there is no need 4257 * to delay again before sending the first RS 4258 */ 4259 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE)) 4260 return; 4261 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters); 4262 4263 write_lock_bh(&ifp->idev->lock); 4264 spin_lock(&ifp->lock); 4265 ifp->idev->rs_interval = rfc3315_s14_backoff_init( 4266 ifp->idev->cnf.rtr_solicit_interval); 4267 ifp->idev->rs_probes = 1; 4268 ifp->idev->if_flags |= IF_RS_SENT; 4269 addrconf_mod_rs_timer(ifp->idev, ifp->idev->rs_interval); 4270 spin_unlock(&ifp->lock); 4271 write_unlock_bh(&ifp->idev->lock); 4272 } 4273 4274 if (bump_id) 4275 rt_genid_bump_ipv6(dev_net(dev)); 4276 4277 /* Make sure that a new temporary address will be created 4278 * before this temporary address becomes deprecated. 4279 */ 4280 if (ifp->flags & IFA_F_TEMPORARY) 4281 addrconf_verify_rtnl(dev_net(dev)); 4282 } 4283 4284 static void addrconf_dad_run(struct inet6_dev *idev, bool restart) 4285 { 4286 struct inet6_ifaddr *ifp; 4287 4288 read_lock_bh(&idev->lock); 4289 list_for_each_entry(ifp, &idev->addr_list, if_list) { 4290 spin_lock(&ifp->lock); 4291 if ((ifp->flags & IFA_F_TENTATIVE && 4292 ifp->state == INET6_IFADDR_STATE_DAD) || restart) { 4293 if (restart) 4294 ifp->state = INET6_IFADDR_STATE_PREDAD; 4295 addrconf_dad_kick(ifp); 4296 } 4297 spin_unlock(&ifp->lock); 4298 } 4299 read_unlock_bh(&idev->lock); 4300 } 4301 4302 #ifdef CONFIG_PROC_FS 4303 struct if6_iter_state { 4304 struct seq_net_private p; 4305 int bucket; 4306 int offset; 4307 }; 4308 4309 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos) 4310 { 4311 struct if6_iter_state *state = seq->private; 4312 struct net *net = seq_file_net(seq); 4313 struct inet6_ifaddr *ifa = NULL; 4314 int p = 0; 4315 4316 /* initial bucket if pos is 0 */ 4317 if (pos == 0) { 4318 state->bucket = 0; 4319 state->offset = 0; 4320 } 4321 4322 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) { 4323 hlist_for_each_entry_rcu(ifa, &net->ipv6.inet6_addr_lst[state->bucket], 4324 addr_lst) { 4325 /* sync with offset */ 4326 if (p < state->offset) { 4327 p++; 4328 continue; 4329 } 4330 return ifa; 4331 } 4332 4333 /* prepare for next bucket */ 4334 state->offset = 0; 4335 p = 0; 4336 } 4337 return NULL; 4338 } 4339 4340 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, 4341 struct inet6_ifaddr *ifa) 4342 { 4343 struct if6_iter_state *state = seq->private; 4344 struct net *net = seq_file_net(seq); 4345 4346 hlist_for_each_entry_continue_rcu(ifa, addr_lst) { 4347 state->offset++; 4348 return ifa; 4349 } 4350 4351 state->offset = 0; 4352 while (++state->bucket < IN6_ADDR_HSIZE) { 4353 hlist_for_each_entry_rcu(ifa, 4354 &net->ipv6.inet6_addr_lst[state->bucket], addr_lst) { 4355 return ifa; 4356 } 4357 } 4358 4359 return NULL; 4360 } 4361 4362 static void *if6_seq_start(struct seq_file *seq, loff_t *pos) 4363 __acquires(rcu) 4364 { 4365 rcu_read_lock(); 4366 return if6_get_first(seq, *pos); 4367 } 4368 4369 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos) 4370 { 4371 struct inet6_ifaddr *ifa; 4372 4373 ifa = if6_get_next(seq, v); 4374 ++*pos; 4375 return ifa; 4376 } 4377 4378 static void if6_seq_stop(struct seq_file *seq, void *v) 4379 __releases(rcu) 4380 { 4381 rcu_read_unlock(); 4382 } 4383 4384 static int if6_seq_show(struct seq_file *seq, void *v) 4385 { 4386 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v; 4387 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n", 4388 &ifp->addr, 4389 ifp->idev->dev->ifindex, 4390 ifp->prefix_len, 4391 ifp->scope, 4392 (u8) ifp->flags, 4393 ifp->idev->dev->name); 4394 return 0; 4395 } 4396 4397 static const struct seq_operations if6_seq_ops = { 4398 .start = if6_seq_start, 4399 .next = if6_seq_next, 4400 .show = if6_seq_show, 4401 .stop = if6_seq_stop, 4402 }; 4403 4404 static int __net_init if6_proc_net_init(struct net *net) 4405 { 4406 if (!proc_create_net("if_inet6", 0444, net->proc_net, &if6_seq_ops, 4407 sizeof(struct if6_iter_state))) 4408 return -ENOMEM; 4409 return 0; 4410 } 4411 4412 static void __net_exit if6_proc_net_exit(struct net *net) 4413 { 4414 remove_proc_entry("if_inet6", net->proc_net); 4415 } 4416 4417 static struct pernet_operations if6_proc_net_ops = { 4418 .init = if6_proc_net_init, 4419 .exit = if6_proc_net_exit, 4420 }; 4421 4422 int __init if6_proc_init(void) 4423 { 4424 return register_pernet_subsys(&if6_proc_net_ops); 4425 } 4426 4427 void if6_proc_exit(void) 4428 { 4429 unregister_pernet_subsys(&if6_proc_net_ops); 4430 } 4431 #endif /* CONFIG_PROC_FS */ 4432 4433 #if IS_ENABLED(CONFIG_IPV6_MIP6) 4434 /* Check if address is a home address configured on any interface. */ 4435 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr) 4436 { 4437 unsigned int hash = inet6_addr_hash(net, addr); 4438 struct inet6_ifaddr *ifp = NULL; 4439 int ret = 0; 4440 4441 rcu_read_lock(); 4442 hlist_for_each_entry_rcu(ifp, &net->ipv6.inet6_addr_lst[hash], addr_lst) { 4443 if (ipv6_addr_equal(&ifp->addr, addr) && 4444 (ifp->flags & IFA_F_HOMEADDRESS)) { 4445 ret = 1; 4446 break; 4447 } 4448 } 4449 rcu_read_unlock(); 4450 return ret; 4451 } 4452 #endif 4453 4454 /* RFC6554 has some algorithm to avoid loops in segment routing by 4455 * checking if the segments contains any of a local interface address. 4456 * 4457 * Quote: 4458 * 4459 * To detect loops in the SRH, a router MUST determine if the SRH 4460 * includes multiple addresses assigned to any interface on that router. 4461 * If such addresses appear more than once and are separated by at least 4462 * one address not assigned to that router. 4463 */ 4464 int ipv6_chk_rpl_srh_loop(struct net *net, const struct in6_addr *segs, 4465 unsigned char nsegs) 4466 { 4467 const struct in6_addr *addr; 4468 int i, ret = 0, found = 0; 4469 struct inet6_ifaddr *ifp; 4470 bool separated = false; 4471 unsigned int hash; 4472 bool hash_found; 4473 4474 rcu_read_lock(); 4475 for (i = 0; i < nsegs; i++) { 4476 addr = &segs[i]; 4477 hash = inet6_addr_hash(net, addr); 4478 4479 hash_found = false; 4480 hlist_for_each_entry_rcu(ifp, &net->ipv6.inet6_addr_lst[hash], addr_lst) { 4481 4482 if (ipv6_addr_equal(&ifp->addr, addr)) { 4483 hash_found = true; 4484 break; 4485 } 4486 } 4487 4488 if (hash_found) { 4489 if (found > 1 && separated) { 4490 ret = 1; 4491 break; 4492 } 4493 4494 separated = false; 4495 found++; 4496 } else { 4497 separated = true; 4498 } 4499 } 4500 rcu_read_unlock(); 4501 4502 return ret; 4503 } 4504 4505 /* 4506 * Periodic address status verification 4507 */ 4508 4509 static void addrconf_verify_rtnl(struct net *net) 4510 { 4511 unsigned long now, next, next_sec, next_sched; 4512 struct inet6_ifaddr *ifp; 4513 int i; 4514 4515 ASSERT_RTNL(); 4516 4517 rcu_read_lock_bh(); 4518 now = jiffies; 4519 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY); 4520 4521 cancel_delayed_work(&net->ipv6.addr_chk_work); 4522 4523 for (i = 0; i < IN6_ADDR_HSIZE; i++) { 4524 restart: 4525 hlist_for_each_entry_rcu_bh(ifp, &net->ipv6.inet6_addr_lst[i], addr_lst) { 4526 unsigned long age; 4527 4528 /* When setting preferred_lft to a value not zero or 4529 * infinity, while valid_lft is infinity 4530 * IFA_F_PERMANENT has a non-infinity life time. 4531 */ 4532 if ((ifp->flags & IFA_F_PERMANENT) && 4533 (ifp->prefered_lft == INFINITY_LIFE_TIME)) 4534 continue; 4535 4536 spin_lock(&ifp->lock); 4537 /* We try to batch several events at once. */ 4538 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ; 4539 4540 if ((ifp->flags&IFA_F_TEMPORARY) && 4541 !(ifp->flags&IFA_F_TENTATIVE) && 4542 ifp->prefered_lft != INFINITY_LIFE_TIME && 4543 !ifp->regen_count && ifp->ifpub) { 4544 /* This is a non-regenerated temporary addr. */ 4545 4546 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry * 4547 ifp->idev->cnf.dad_transmits * 4548 max(NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME), HZ/100) / HZ; 4549 4550 if (age + regen_advance >= ifp->prefered_lft) { 4551 struct inet6_ifaddr *ifpub = ifp->ifpub; 4552 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 4553 next = ifp->tstamp + ifp->prefered_lft * HZ; 4554 4555 ifp->regen_count++; 4556 in6_ifa_hold(ifp); 4557 in6_ifa_hold(ifpub); 4558 spin_unlock(&ifp->lock); 4559 4560 spin_lock(&ifpub->lock); 4561 ifpub->regen_count = 0; 4562 spin_unlock(&ifpub->lock); 4563 rcu_read_unlock_bh(); 4564 ipv6_create_tempaddr(ifpub, true); 4565 in6_ifa_put(ifpub); 4566 in6_ifa_put(ifp); 4567 rcu_read_lock_bh(); 4568 goto restart; 4569 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next)) 4570 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ; 4571 } 4572 4573 if (ifp->valid_lft != INFINITY_LIFE_TIME && 4574 age >= ifp->valid_lft) { 4575 spin_unlock(&ifp->lock); 4576 in6_ifa_hold(ifp); 4577 rcu_read_unlock_bh(); 4578 ipv6_del_addr(ifp); 4579 rcu_read_lock_bh(); 4580 goto restart; 4581 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) { 4582 spin_unlock(&ifp->lock); 4583 continue; 4584 } else if (age >= ifp->prefered_lft) { 4585 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */ 4586 int deprecate = 0; 4587 4588 if (!(ifp->flags&IFA_F_DEPRECATED)) { 4589 deprecate = 1; 4590 ifp->flags |= IFA_F_DEPRECATED; 4591 } 4592 4593 if ((ifp->valid_lft != INFINITY_LIFE_TIME) && 4594 (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))) 4595 next = ifp->tstamp + ifp->valid_lft * HZ; 4596 4597 spin_unlock(&ifp->lock); 4598 4599 if (deprecate) { 4600 in6_ifa_hold(ifp); 4601 4602 ipv6_ifa_notify(0, ifp); 4603 in6_ifa_put(ifp); 4604 goto restart; 4605 } 4606 } else { 4607 /* ifp->prefered_lft <= ifp->valid_lft */ 4608 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 4609 next = ifp->tstamp + ifp->prefered_lft * HZ; 4610 spin_unlock(&ifp->lock); 4611 } 4612 } 4613 } 4614 4615 next_sec = round_jiffies_up(next); 4616 next_sched = next; 4617 4618 /* If rounded timeout is accurate enough, accept it. */ 4619 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ)) 4620 next_sched = next_sec; 4621 4622 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */ 4623 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX)) 4624 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX; 4625 4626 pr_debug("now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n", 4627 now, next, next_sec, next_sched); 4628 mod_delayed_work(addrconf_wq, &net->ipv6.addr_chk_work, next_sched - now); 4629 rcu_read_unlock_bh(); 4630 } 4631 4632 static void addrconf_verify_work(struct work_struct *w) 4633 { 4634 struct net *net = container_of(to_delayed_work(w), struct net, 4635 ipv6.addr_chk_work); 4636 4637 rtnl_lock(); 4638 addrconf_verify_rtnl(net); 4639 rtnl_unlock(); 4640 } 4641 4642 static void addrconf_verify(struct net *net) 4643 { 4644 mod_delayed_work(addrconf_wq, &net->ipv6.addr_chk_work, 0); 4645 } 4646 4647 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local, 4648 struct in6_addr **peer_pfx) 4649 { 4650 struct in6_addr *pfx = NULL; 4651 4652 *peer_pfx = NULL; 4653 4654 if (addr) 4655 pfx = nla_data(addr); 4656 4657 if (local) { 4658 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx))) 4659 *peer_pfx = pfx; 4660 pfx = nla_data(local); 4661 } 4662 4663 return pfx; 4664 } 4665 4666 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = { 4667 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) }, 4668 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) }, 4669 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) }, 4670 [IFA_FLAGS] = { .len = sizeof(u32) }, 4671 [IFA_RT_PRIORITY] = { .len = sizeof(u32) }, 4672 [IFA_TARGET_NETNSID] = { .type = NLA_S32 }, 4673 [IFA_PROTO] = { .type = NLA_U8 }, 4674 }; 4675 4676 static int 4677 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, 4678 struct netlink_ext_ack *extack) 4679 { 4680 struct net *net = sock_net(skb->sk); 4681 struct ifaddrmsg *ifm; 4682 struct nlattr *tb[IFA_MAX+1]; 4683 struct in6_addr *pfx, *peer_pfx; 4684 u32 ifa_flags; 4685 int err; 4686 4687 err = nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX, 4688 ifa_ipv6_policy, extack); 4689 if (err < 0) 4690 return err; 4691 4692 ifm = nlmsg_data(nlh); 4693 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx); 4694 if (!pfx) 4695 return -EINVAL; 4696 4697 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags; 4698 4699 /* We ignore other flags so far. */ 4700 ifa_flags &= IFA_F_MANAGETEMPADDR; 4701 4702 return inet6_addr_del(net, ifm->ifa_index, ifa_flags, pfx, 4703 ifm->ifa_prefixlen); 4704 } 4705 4706 static int modify_prefix_route(struct inet6_ifaddr *ifp, 4707 unsigned long expires, u32 flags, 4708 bool modify_peer) 4709 { 4710 struct fib6_info *f6i; 4711 u32 prio; 4712 4713 f6i = addrconf_get_prefix_route(modify_peer ? &ifp->peer_addr : &ifp->addr, 4714 ifp->prefix_len, 4715 ifp->idev->dev, 0, RTF_DEFAULT, true); 4716 if (!f6i) 4717 return -ENOENT; 4718 4719 prio = ifp->rt_priority ? : IP6_RT_PRIO_ADDRCONF; 4720 if (f6i->fib6_metric != prio) { 4721 /* delete old one */ 4722 ip6_del_rt(dev_net(ifp->idev->dev), f6i, false); 4723 4724 /* add new one */ 4725 addrconf_prefix_route(modify_peer ? &ifp->peer_addr : &ifp->addr, 4726 ifp->prefix_len, 4727 ifp->rt_priority, ifp->idev->dev, 4728 expires, flags, GFP_KERNEL); 4729 } else { 4730 if (!expires) 4731 fib6_clean_expires(f6i); 4732 else 4733 fib6_set_expires(f6i, expires); 4734 4735 fib6_info_release(f6i); 4736 } 4737 4738 return 0; 4739 } 4740 4741 static int inet6_addr_modify(struct net *net, struct inet6_ifaddr *ifp, 4742 struct ifa6_config *cfg) 4743 { 4744 u32 flags; 4745 clock_t expires; 4746 unsigned long timeout; 4747 bool was_managetempaddr; 4748 bool had_prefixroute; 4749 bool new_peer = false; 4750 4751 ASSERT_RTNL(); 4752 4753 if (!cfg->valid_lft || cfg->preferred_lft > cfg->valid_lft) 4754 return -EINVAL; 4755 4756 if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR && 4757 (ifp->flags & IFA_F_TEMPORARY || ifp->prefix_len != 64)) 4758 return -EINVAL; 4759 4760 if (!(ifp->flags & IFA_F_TENTATIVE) || ifp->flags & IFA_F_DADFAILED) 4761 cfg->ifa_flags &= ~IFA_F_OPTIMISTIC; 4762 4763 timeout = addrconf_timeout_fixup(cfg->valid_lft, HZ); 4764 if (addrconf_finite_timeout(timeout)) { 4765 expires = jiffies_to_clock_t(timeout * HZ); 4766 cfg->valid_lft = timeout; 4767 flags = RTF_EXPIRES; 4768 } else { 4769 expires = 0; 4770 flags = 0; 4771 cfg->ifa_flags |= IFA_F_PERMANENT; 4772 } 4773 4774 timeout = addrconf_timeout_fixup(cfg->preferred_lft, HZ); 4775 if (addrconf_finite_timeout(timeout)) { 4776 if (timeout == 0) 4777 cfg->ifa_flags |= IFA_F_DEPRECATED; 4778 cfg->preferred_lft = timeout; 4779 } 4780 4781 if (cfg->peer_pfx && 4782 memcmp(&ifp->peer_addr, cfg->peer_pfx, sizeof(struct in6_addr))) { 4783 if (!ipv6_addr_any(&ifp->peer_addr)) 4784 cleanup_prefix_route(ifp, expires, true, true); 4785 new_peer = true; 4786 } 4787 4788 spin_lock_bh(&ifp->lock); 4789 was_managetempaddr = ifp->flags & IFA_F_MANAGETEMPADDR; 4790 had_prefixroute = ifp->flags & IFA_F_PERMANENT && 4791 !(ifp->flags & IFA_F_NOPREFIXROUTE); 4792 ifp->flags &= ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | 4793 IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR | 4794 IFA_F_NOPREFIXROUTE); 4795 ifp->flags |= cfg->ifa_flags; 4796 ifp->tstamp = jiffies; 4797 ifp->valid_lft = cfg->valid_lft; 4798 ifp->prefered_lft = cfg->preferred_lft; 4799 ifp->ifa_proto = cfg->ifa_proto; 4800 4801 if (cfg->rt_priority && cfg->rt_priority != ifp->rt_priority) 4802 ifp->rt_priority = cfg->rt_priority; 4803 4804 if (new_peer) 4805 ifp->peer_addr = *cfg->peer_pfx; 4806 4807 spin_unlock_bh(&ifp->lock); 4808 if (!(ifp->flags&IFA_F_TENTATIVE)) 4809 ipv6_ifa_notify(0, ifp); 4810 4811 if (!(cfg->ifa_flags & IFA_F_NOPREFIXROUTE)) { 4812 int rc = -ENOENT; 4813 4814 if (had_prefixroute) 4815 rc = modify_prefix_route(ifp, expires, flags, false); 4816 4817 /* prefix route could have been deleted; if so restore it */ 4818 if (rc == -ENOENT) { 4819 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, 4820 ifp->rt_priority, ifp->idev->dev, 4821 expires, flags, GFP_KERNEL); 4822 } 4823 4824 if (had_prefixroute && !ipv6_addr_any(&ifp->peer_addr)) 4825 rc = modify_prefix_route(ifp, expires, flags, true); 4826 4827 if (rc == -ENOENT && !ipv6_addr_any(&ifp->peer_addr)) { 4828 addrconf_prefix_route(&ifp->peer_addr, ifp->prefix_len, 4829 ifp->rt_priority, ifp->idev->dev, 4830 expires, flags, GFP_KERNEL); 4831 } 4832 } else if (had_prefixroute) { 4833 enum cleanup_prefix_rt_t action; 4834 unsigned long rt_expires; 4835 4836 write_lock_bh(&ifp->idev->lock); 4837 action = check_cleanup_prefix_route(ifp, &rt_expires); 4838 write_unlock_bh(&ifp->idev->lock); 4839 4840 if (action != CLEANUP_PREFIX_RT_NOP) { 4841 cleanup_prefix_route(ifp, rt_expires, 4842 action == CLEANUP_PREFIX_RT_DEL, false); 4843 } 4844 } 4845 4846 if (was_managetempaddr || ifp->flags & IFA_F_MANAGETEMPADDR) { 4847 if (was_managetempaddr && 4848 !(ifp->flags & IFA_F_MANAGETEMPADDR)) { 4849 cfg->valid_lft = 0; 4850 cfg->preferred_lft = 0; 4851 } 4852 manage_tempaddrs(ifp->idev, ifp, cfg->valid_lft, 4853 cfg->preferred_lft, !was_managetempaddr, 4854 jiffies); 4855 } 4856 4857 addrconf_verify_rtnl(net); 4858 4859 return 0; 4860 } 4861 4862 static int 4863 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, 4864 struct netlink_ext_ack *extack) 4865 { 4866 struct net *net = sock_net(skb->sk); 4867 struct ifaddrmsg *ifm; 4868 struct nlattr *tb[IFA_MAX+1]; 4869 struct in6_addr *peer_pfx; 4870 struct inet6_ifaddr *ifa; 4871 struct net_device *dev; 4872 struct inet6_dev *idev; 4873 struct ifa6_config cfg; 4874 int err; 4875 4876 err = nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX, 4877 ifa_ipv6_policy, extack); 4878 if (err < 0) 4879 return err; 4880 4881 memset(&cfg, 0, sizeof(cfg)); 4882 4883 ifm = nlmsg_data(nlh); 4884 cfg.pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx); 4885 if (!cfg.pfx) 4886 return -EINVAL; 4887 4888 cfg.peer_pfx = peer_pfx; 4889 cfg.plen = ifm->ifa_prefixlen; 4890 if (tb[IFA_RT_PRIORITY]) 4891 cfg.rt_priority = nla_get_u32(tb[IFA_RT_PRIORITY]); 4892 4893 if (tb[IFA_PROTO]) 4894 cfg.ifa_proto = nla_get_u8(tb[IFA_PROTO]); 4895 4896 cfg.valid_lft = INFINITY_LIFE_TIME; 4897 cfg.preferred_lft = INFINITY_LIFE_TIME; 4898 4899 if (tb[IFA_CACHEINFO]) { 4900 struct ifa_cacheinfo *ci; 4901 4902 ci = nla_data(tb[IFA_CACHEINFO]); 4903 cfg.valid_lft = ci->ifa_valid; 4904 cfg.preferred_lft = ci->ifa_prefered; 4905 } 4906 4907 dev = __dev_get_by_index(net, ifm->ifa_index); 4908 if (!dev) 4909 return -ENODEV; 4910 4911 if (tb[IFA_FLAGS]) 4912 cfg.ifa_flags = nla_get_u32(tb[IFA_FLAGS]); 4913 else 4914 cfg.ifa_flags = ifm->ifa_flags; 4915 4916 /* We ignore other flags so far. */ 4917 cfg.ifa_flags &= IFA_F_NODAD | IFA_F_HOMEADDRESS | 4918 IFA_F_MANAGETEMPADDR | IFA_F_NOPREFIXROUTE | 4919 IFA_F_MCAUTOJOIN | IFA_F_OPTIMISTIC; 4920 4921 idev = ipv6_find_idev(dev); 4922 if (IS_ERR(idev)) 4923 return PTR_ERR(idev); 4924 4925 if (!ipv6_allow_optimistic_dad(net, idev)) 4926 cfg.ifa_flags &= ~IFA_F_OPTIMISTIC; 4927 4928 if (cfg.ifa_flags & IFA_F_NODAD && 4929 cfg.ifa_flags & IFA_F_OPTIMISTIC) { 4930 NL_SET_ERR_MSG(extack, "IFA_F_NODAD and IFA_F_OPTIMISTIC are mutually exclusive"); 4931 return -EINVAL; 4932 } 4933 4934 ifa = ipv6_get_ifaddr(net, cfg.pfx, dev, 1); 4935 if (!ifa) { 4936 /* 4937 * It would be best to check for !NLM_F_CREATE here but 4938 * userspace already relies on not having to provide this. 4939 */ 4940 return inet6_addr_add(net, ifm->ifa_index, &cfg, extack); 4941 } 4942 4943 if (nlh->nlmsg_flags & NLM_F_EXCL || 4944 !(nlh->nlmsg_flags & NLM_F_REPLACE)) 4945 err = -EEXIST; 4946 else 4947 err = inet6_addr_modify(net, ifa, &cfg); 4948 4949 in6_ifa_put(ifa); 4950 4951 return err; 4952 } 4953 4954 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u32 flags, 4955 u8 scope, int ifindex) 4956 { 4957 struct ifaddrmsg *ifm; 4958 4959 ifm = nlmsg_data(nlh); 4960 ifm->ifa_family = AF_INET6; 4961 ifm->ifa_prefixlen = prefixlen; 4962 ifm->ifa_flags = flags; 4963 ifm->ifa_scope = scope; 4964 ifm->ifa_index = ifindex; 4965 } 4966 4967 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp, 4968 unsigned long tstamp, u32 preferred, u32 valid) 4969 { 4970 struct ifa_cacheinfo ci; 4971 4972 ci.cstamp = cstamp_delta(cstamp); 4973 ci.tstamp = cstamp_delta(tstamp); 4974 ci.ifa_prefered = preferred; 4975 ci.ifa_valid = valid; 4976 4977 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci); 4978 } 4979 4980 static inline int rt_scope(int ifa_scope) 4981 { 4982 if (ifa_scope & IFA_HOST) 4983 return RT_SCOPE_HOST; 4984 else if (ifa_scope & IFA_LINK) 4985 return RT_SCOPE_LINK; 4986 else if (ifa_scope & IFA_SITE) 4987 return RT_SCOPE_SITE; 4988 else 4989 return RT_SCOPE_UNIVERSE; 4990 } 4991 4992 static inline int inet6_ifaddr_msgsize(void) 4993 { 4994 return NLMSG_ALIGN(sizeof(struct ifaddrmsg)) 4995 + nla_total_size(16) /* IFA_LOCAL */ 4996 + nla_total_size(16) /* IFA_ADDRESS */ 4997 + nla_total_size(sizeof(struct ifa_cacheinfo)) 4998 + nla_total_size(4) /* IFA_FLAGS */ 4999 + nla_total_size(1) /* IFA_PROTO */ 5000 + nla_total_size(4) /* IFA_RT_PRIORITY */; 5001 } 5002 5003 enum addr_type_t { 5004 UNICAST_ADDR, 5005 MULTICAST_ADDR, 5006 ANYCAST_ADDR, 5007 }; 5008 5009 struct inet6_fill_args { 5010 u32 portid; 5011 u32 seq; 5012 int event; 5013 unsigned int flags; 5014 int netnsid; 5015 int ifindex; 5016 enum addr_type_t type; 5017 }; 5018 5019 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa, 5020 struct inet6_fill_args *args) 5021 { 5022 struct nlmsghdr *nlh; 5023 u32 preferred, valid; 5024 5025 nlh = nlmsg_put(skb, args->portid, args->seq, args->event, 5026 sizeof(struct ifaddrmsg), args->flags); 5027 if (!nlh) 5028 return -EMSGSIZE; 5029 5030 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope), 5031 ifa->idev->dev->ifindex); 5032 5033 if (args->netnsid >= 0 && 5034 nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid)) 5035 goto error; 5036 5037 spin_lock_bh(&ifa->lock); 5038 if (!((ifa->flags&IFA_F_PERMANENT) && 5039 (ifa->prefered_lft == INFINITY_LIFE_TIME))) { 5040 preferred = ifa->prefered_lft; 5041 valid = ifa->valid_lft; 5042 if (preferred != INFINITY_LIFE_TIME) { 5043 long tval = (jiffies - ifa->tstamp)/HZ; 5044 if (preferred > tval) 5045 preferred -= tval; 5046 else 5047 preferred = 0; 5048 if (valid != INFINITY_LIFE_TIME) { 5049 if (valid > tval) 5050 valid -= tval; 5051 else 5052 valid = 0; 5053 } 5054 } 5055 } else { 5056 preferred = INFINITY_LIFE_TIME; 5057 valid = INFINITY_LIFE_TIME; 5058 } 5059 spin_unlock_bh(&ifa->lock); 5060 5061 if (!ipv6_addr_any(&ifa->peer_addr)) { 5062 if (nla_put_in6_addr(skb, IFA_LOCAL, &ifa->addr) < 0 || 5063 nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->peer_addr) < 0) 5064 goto error; 5065 } else 5066 if (nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->addr) < 0) 5067 goto error; 5068 5069 if (ifa->rt_priority && 5070 nla_put_u32(skb, IFA_RT_PRIORITY, ifa->rt_priority)) 5071 goto error; 5072 5073 if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) 5074 goto error; 5075 5076 if (nla_put_u32(skb, IFA_FLAGS, ifa->flags) < 0) 5077 goto error; 5078 5079 if (ifa->ifa_proto && 5080 nla_put_u8(skb, IFA_PROTO, ifa->ifa_proto)) 5081 goto error; 5082 5083 nlmsg_end(skb, nlh); 5084 return 0; 5085 5086 error: 5087 nlmsg_cancel(skb, nlh); 5088 return -EMSGSIZE; 5089 } 5090 5091 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca, 5092 struct inet6_fill_args *args) 5093 { 5094 struct nlmsghdr *nlh; 5095 u8 scope = RT_SCOPE_UNIVERSE; 5096 int ifindex = ifmca->idev->dev->ifindex; 5097 5098 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE) 5099 scope = RT_SCOPE_SITE; 5100 5101 nlh = nlmsg_put(skb, args->portid, args->seq, args->event, 5102 sizeof(struct ifaddrmsg), args->flags); 5103 if (!nlh) 5104 return -EMSGSIZE; 5105 5106 if (args->netnsid >= 0 && 5107 nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid)) { 5108 nlmsg_cancel(skb, nlh); 5109 return -EMSGSIZE; 5110 } 5111 5112 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 5113 if (nla_put_in6_addr(skb, IFA_MULTICAST, &ifmca->mca_addr) < 0 || 5114 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp, 5115 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 5116 nlmsg_cancel(skb, nlh); 5117 return -EMSGSIZE; 5118 } 5119 5120 nlmsg_end(skb, nlh); 5121 return 0; 5122 } 5123 5124 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca, 5125 struct inet6_fill_args *args) 5126 { 5127 struct net_device *dev = fib6_info_nh_dev(ifaca->aca_rt); 5128 int ifindex = dev ? dev->ifindex : 1; 5129 struct nlmsghdr *nlh; 5130 u8 scope = RT_SCOPE_UNIVERSE; 5131 5132 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE) 5133 scope = RT_SCOPE_SITE; 5134 5135 nlh = nlmsg_put(skb, args->portid, args->seq, args->event, 5136 sizeof(struct ifaddrmsg), args->flags); 5137 if (!nlh) 5138 return -EMSGSIZE; 5139 5140 if (args->netnsid >= 0 && 5141 nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid)) { 5142 nlmsg_cancel(skb, nlh); 5143 return -EMSGSIZE; 5144 } 5145 5146 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 5147 if (nla_put_in6_addr(skb, IFA_ANYCAST, &ifaca->aca_addr) < 0 || 5148 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp, 5149 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 5150 nlmsg_cancel(skb, nlh); 5151 return -EMSGSIZE; 5152 } 5153 5154 nlmsg_end(skb, nlh); 5155 return 0; 5156 } 5157 5158 /* called with rcu_read_lock() */ 5159 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb, 5160 struct netlink_callback *cb, int s_ip_idx, 5161 struct inet6_fill_args *fillargs) 5162 { 5163 struct ifmcaddr6 *ifmca; 5164 struct ifacaddr6 *ifaca; 5165 int ip_idx = 0; 5166 int err = 1; 5167 5168 read_lock_bh(&idev->lock); 5169 switch (fillargs->type) { 5170 case UNICAST_ADDR: { 5171 struct inet6_ifaddr *ifa; 5172 fillargs->event = RTM_NEWADDR; 5173 5174 /* unicast address incl. temp addr */ 5175 list_for_each_entry(ifa, &idev->addr_list, if_list) { 5176 if (ip_idx < s_ip_idx) 5177 goto next; 5178 err = inet6_fill_ifaddr(skb, ifa, fillargs); 5179 if (err < 0) 5180 break; 5181 nl_dump_check_consistent(cb, nlmsg_hdr(skb)); 5182 next: 5183 ip_idx++; 5184 } 5185 break; 5186 } 5187 case MULTICAST_ADDR: 5188 read_unlock_bh(&idev->lock); 5189 fillargs->event = RTM_GETMULTICAST; 5190 5191 /* multicast address */ 5192 for (ifmca = rtnl_dereference(idev->mc_list); 5193 ifmca; 5194 ifmca = rtnl_dereference(ifmca->next), ip_idx++) { 5195 if (ip_idx < s_ip_idx) 5196 continue; 5197 err = inet6_fill_ifmcaddr(skb, ifmca, fillargs); 5198 if (err < 0) 5199 break; 5200 } 5201 read_lock_bh(&idev->lock); 5202 break; 5203 case ANYCAST_ADDR: 5204 fillargs->event = RTM_GETANYCAST; 5205 /* anycast address */ 5206 for (ifaca = idev->ac_list; ifaca; 5207 ifaca = ifaca->aca_next, ip_idx++) { 5208 if (ip_idx < s_ip_idx) 5209 continue; 5210 err = inet6_fill_ifacaddr(skb, ifaca, fillargs); 5211 if (err < 0) 5212 break; 5213 } 5214 break; 5215 default: 5216 break; 5217 } 5218 read_unlock_bh(&idev->lock); 5219 cb->args[2] = ip_idx; 5220 return err; 5221 } 5222 5223 static int inet6_valid_dump_ifaddr_req(const struct nlmsghdr *nlh, 5224 struct inet6_fill_args *fillargs, 5225 struct net **tgt_net, struct sock *sk, 5226 struct netlink_callback *cb) 5227 { 5228 struct netlink_ext_ack *extack = cb->extack; 5229 struct nlattr *tb[IFA_MAX+1]; 5230 struct ifaddrmsg *ifm; 5231 int err, i; 5232 5233 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) { 5234 NL_SET_ERR_MSG_MOD(extack, "Invalid header for address dump request"); 5235 return -EINVAL; 5236 } 5237 5238 ifm = nlmsg_data(nlh); 5239 if (ifm->ifa_prefixlen || ifm->ifa_flags || ifm->ifa_scope) { 5240 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for address dump request"); 5241 return -EINVAL; 5242 } 5243 5244 fillargs->ifindex = ifm->ifa_index; 5245 if (fillargs->ifindex) { 5246 cb->answer_flags |= NLM_F_DUMP_FILTERED; 5247 fillargs->flags |= NLM_F_DUMP_FILTERED; 5248 } 5249 5250 err = nlmsg_parse_deprecated_strict(nlh, sizeof(*ifm), tb, IFA_MAX, 5251 ifa_ipv6_policy, extack); 5252 if (err < 0) 5253 return err; 5254 5255 for (i = 0; i <= IFA_MAX; ++i) { 5256 if (!tb[i]) 5257 continue; 5258 5259 if (i == IFA_TARGET_NETNSID) { 5260 struct net *net; 5261 5262 fillargs->netnsid = nla_get_s32(tb[i]); 5263 net = rtnl_get_net_ns_capable(sk, fillargs->netnsid); 5264 if (IS_ERR(net)) { 5265 fillargs->netnsid = -1; 5266 NL_SET_ERR_MSG_MOD(extack, "Invalid target network namespace id"); 5267 return PTR_ERR(net); 5268 } 5269 *tgt_net = net; 5270 } else { 5271 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in dump request"); 5272 return -EINVAL; 5273 } 5274 } 5275 5276 return 0; 5277 } 5278 5279 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb, 5280 enum addr_type_t type) 5281 { 5282 const struct nlmsghdr *nlh = cb->nlh; 5283 struct inet6_fill_args fillargs = { 5284 .portid = NETLINK_CB(cb->skb).portid, 5285 .seq = cb->nlh->nlmsg_seq, 5286 .flags = NLM_F_MULTI, 5287 .netnsid = -1, 5288 .type = type, 5289 }; 5290 struct net *tgt_net = sock_net(skb->sk); 5291 int idx, s_idx, s_ip_idx; 5292 int h, s_h; 5293 struct net_device *dev; 5294 struct inet6_dev *idev; 5295 struct hlist_head *head; 5296 int err = 0; 5297 5298 s_h = cb->args[0]; 5299 s_idx = idx = cb->args[1]; 5300 s_ip_idx = cb->args[2]; 5301 5302 if (cb->strict_check) { 5303 err = inet6_valid_dump_ifaddr_req(nlh, &fillargs, &tgt_net, 5304 skb->sk, cb); 5305 if (err < 0) 5306 goto put_tgt_net; 5307 5308 err = 0; 5309 if (fillargs.ifindex) { 5310 dev = __dev_get_by_index(tgt_net, fillargs.ifindex); 5311 if (!dev) { 5312 err = -ENODEV; 5313 goto put_tgt_net; 5314 } 5315 idev = __in6_dev_get(dev); 5316 if (idev) { 5317 err = in6_dump_addrs(idev, skb, cb, s_ip_idx, 5318 &fillargs); 5319 if (err > 0) 5320 err = 0; 5321 } 5322 goto put_tgt_net; 5323 } 5324 } 5325 5326 rcu_read_lock(); 5327 cb->seq = atomic_read(&tgt_net->ipv6.dev_addr_genid) ^ tgt_net->dev_base_seq; 5328 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 5329 idx = 0; 5330 head = &tgt_net->dev_index_head[h]; 5331 hlist_for_each_entry_rcu(dev, head, index_hlist) { 5332 if (idx < s_idx) 5333 goto cont; 5334 if (h > s_h || idx > s_idx) 5335 s_ip_idx = 0; 5336 idev = __in6_dev_get(dev); 5337 if (!idev) 5338 goto cont; 5339 5340 if (in6_dump_addrs(idev, skb, cb, s_ip_idx, 5341 &fillargs) < 0) 5342 goto done; 5343 cont: 5344 idx++; 5345 } 5346 } 5347 done: 5348 rcu_read_unlock(); 5349 cb->args[0] = h; 5350 cb->args[1] = idx; 5351 put_tgt_net: 5352 if (fillargs.netnsid >= 0) 5353 put_net(tgt_net); 5354 5355 return skb->len ? : err; 5356 } 5357 5358 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb) 5359 { 5360 enum addr_type_t type = UNICAST_ADDR; 5361 5362 return inet6_dump_addr(skb, cb, type); 5363 } 5364 5365 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb) 5366 { 5367 enum addr_type_t type = MULTICAST_ADDR; 5368 5369 return inet6_dump_addr(skb, cb, type); 5370 } 5371 5372 5373 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb) 5374 { 5375 enum addr_type_t type = ANYCAST_ADDR; 5376 5377 return inet6_dump_addr(skb, cb, type); 5378 } 5379 5380 static int inet6_rtm_valid_getaddr_req(struct sk_buff *skb, 5381 const struct nlmsghdr *nlh, 5382 struct nlattr **tb, 5383 struct netlink_ext_ack *extack) 5384 { 5385 struct ifaddrmsg *ifm; 5386 int i, err; 5387 5388 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) { 5389 NL_SET_ERR_MSG_MOD(extack, "Invalid header for get address request"); 5390 return -EINVAL; 5391 } 5392 5393 if (!netlink_strict_get_check(skb)) 5394 return nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX, 5395 ifa_ipv6_policy, extack); 5396 5397 ifm = nlmsg_data(nlh); 5398 if (ifm->ifa_prefixlen || ifm->ifa_flags || ifm->ifa_scope) { 5399 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for get address request"); 5400 return -EINVAL; 5401 } 5402 5403 err = nlmsg_parse_deprecated_strict(nlh, sizeof(*ifm), tb, IFA_MAX, 5404 ifa_ipv6_policy, extack); 5405 if (err) 5406 return err; 5407 5408 for (i = 0; i <= IFA_MAX; i++) { 5409 if (!tb[i]) 5410 continue; 5411 5412 switch (i) { 5413 case IFA_TARGET_NETNSID: 5414 case IFA_ADDRESS: 5415 case IFA_LOCAL: 5416 break; 5417 default: 5418 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in get address request"); 5419 return -EINVAL; 5420 } 5421 } 5422 5423 return 0; 5424 } 5425 5426 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh, 5427 struct netlink_ext_ack *extack) 5428 { 5429 struct net *tgt_net = sock_net(in_skb->sk); 5430 struct inet6_fill_args fillargs = { 5431 .portid = NETLINK_CB(in_skb).portid, 5432 .seq = nlh->nlmsg_seq, 5433 .event = RTM_NEWADDR, 5434 .flags = 0, 5435 .netnsid = -1, 5436 }; 5437 struct ifaddrmsg *ifm; 5438 struct nlattr *tb[IFA_MAX+1]; 5439 struct in6_addr *addr = NULL, *peer; 5440 struct net_device *dev = NULL; 5441 struct inet6_ifaddr *ifa; 5442 struct sk_buff *skb; 5443 int err; 5444 5445 err = inet6_rtm_valid_getaddr_req(in_skb, nlh, tb, extack); 5446 if (err < 0) 5447 return err; 5448 5449 if (tb[IFA_TARGET_NETNSID]) { 5450 fillargs.netnsid = nla_get_s32(tb[IFA_TARGET_NETNSID]); 5451 5452 tgt_net = rtnl_get_net_ns_capable(NETLINK_CB(in_skb).sk, 5453 fillargs.netnsid); 5454 if (IS_ERR(tgt_net)) 5455 return PTR_ERR(tgt_net); 5456 } 5457 5458 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer); 5459 if (!addr) 5460 return -EINVAL; 5461 5462 ifm = nlmsg_data(nlh); 5463 if (ifm->ifa_index) 5464 dev = dev_get_by_index(tgt_net, ifm->ifa_index); 5465 5466 ifa = ipv6_get_ifaddr(tgt_net, addr, dev, 1); 5467 if (!ifa) { 5468 err = -EADDRNOTAVAIL; 5469 goto errout; 5470 } 5471 5472 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL); 5473 if (!skb) { 5474 err = -ENOBUFS; 5475 goto errout_ifa; 5476 } 5477 5478 err = inet6_fill_ifaddr(skb, ifa, &fillargs); 5479 if (err < 0) { 5480 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 5481 WARN_ON(err == -EMSGSIZE); 5482 kfree_skb(skb); 5483 goto errout_ifa; 5484 } 5485 err = rtnl_unicast(skb, tgt_net, NETLINK_CB(in_skb).portid); 5486 errout_ifa: 5487 in6_ifa_put(ifa); 5488 errout: 5489 dev_put(dev); 5490 if (fillargs.netnsid >= 0) 5491 put_net(tgt_net); 5492 5493 return err; 5494 } 5495 5496 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa) 5497 { 5498 struct sk_buff *skb; 5499 struct net *net = dev_net(ifa->idev->dev); 5500 struct inet6_fill_args fillargs = { 5501 .portid = 0, 5502 .seq = 0, 5503 .event = event, 5504 .flags = 0, 5505 .netnsid = -1, 5506 }; 5507 int err = -ENOBUFS; 5508 5509 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC); 5510 if (!skb) 5511 goto errout; 5512 5513 err = inet6_fill_ifaddr(skb, ifa, &fillargs); 5514 if (err < 0) { 5515 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 5516 WARN_ON(err == -EMSGSIZE); 5517 kfree_skb(skb); 5518 goto errout; 5519 } 5520 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC); 5521 return; 5522 errout: 5523 if (err < 0) 5524 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err); 5525 } 5526 5527 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf, 5528 __s32 *array, int bytes) 5529 { 5530 BUG_ON(bytes < (DEVCONF_MAX * 4)); 5531 5532 memset(array, 0, bytes); 5533 array[DEVCONF_FORWARDING] = cnf->forwarding; 5534 array[DEVCONF_HOPLIMIT] = cnf->hop_limit; 5535 array[DEVCONF_MTU6] = cnf->mtu6; 5536 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra; 5537 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects; 5538 array[DEVCONF_AUTOCONF] = cnf->autoconf; 5539 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits; 5540 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits; 5541 array[DEVCONF_RTR_SOLICIT_INTERVAL] = 5542 jiffies_to_msecs(cnf->rtr_solicit_interval); 5543 array[DEVCONF_RTR_SOLICIT_MAX_INTERVAL] = 5544 jiffies_to_msecs(cnf->rtr_solicit_max_interval); 5545 array[DEVCONF_RTR_SOLICIT_DELAY] = 5546 jiffies_to_msecs(cnf->rtr_solicit_delay); 5547 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version; 5548 array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] = 5549 jiffies_to_msecs(cnf->mldv1_unsolicited_report_interval); 5550 array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] = 5551 jiffies_to_msecs(cnf->mldv2_unsolicited_report_interval); 5552 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr; 5553 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft; 5554 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft; 5555 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry; 5556 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor; 5557 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses; 5558 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr; 5559 array[DEVCONF_RA_DEFRTR_METRIC] = cnf->ra_defrtr_metric; 5560 array[DEVCONF_ACCEPT_RA_MIN_HOP_LIMIT] = cnf->accept_ra_min_hop_limit; 5561 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo; 5562 #ifdef CONFIG_IPV6_ROUTER_PREF 5563 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref; 5564 array[DEVCONF_RTR_PROBE_INTERVAL] = 5565 jiffies_to_msecs(cnf->rtr_probe_interval); 5566 #ifdef CONFIG_IPV6_ROUTE_INFO 5567 array[DEVCONF_ACCEPT_RA_RT_INFO_MIN_PLEN] = cnf->accept_ra_rt_info_min_plen; 5568 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen; 5569 #endif 5570 #endif 5571 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp; 5572 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route; 5573 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 5574 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad; 5575 array[DEVCONF_USE_OPTIMISTIC] = cnf->use_optimistic; 5576 #endif 5577 #ifdef CONFIG_IPV6_MROUTE 5578 array[DEVCONF_MC_FORWARDING] = atomic_read(&cnf->mc_forwarding); 5579 #endif 5580 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6; 5581 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad; 5582 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao; 5583 array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify; 5584 array[DEVCONF_SUPPRESS_FRAG_NDISC] = cnf->suppress_frag_ndisc; 5585 array[DEVCONF_ACCEPT_RA_FROM_LOCAL] = cnf->accept_ra_from_local; 5586 array[DEVCONF_ACCEPT_RA_MTU] = cnf->accept_ra_mtu; 5587 array[DEVCONF_IGNORE_ROUTES_WITH_LINKDOWN] = cnf->ignore_routes_with_linkdown; 5588 /* we omit DEVCONF_STABLE_SECRET for now */ 5589 array[DEVCONF_USE_OIF_ADDRS_ONLY] = cnf->use_oif_addrs_only; 5590 array[DEVCONF_DROP_UNICAST_IN_L2_MULTICAST] = cnf->drop_unicast_in_l2_multicast; 5591 array[DEVCONF_DROP_UNSOLICITED_NA] = cnf->drop_unsolicited_na; 5592 array[DEVCONF_KEEP_ADDR_ON_DOWN] = cnf->keep_addr_on_down; 5593 array[DEVCONF_SEG6_ENABLED] = cnf->seg6_enabled; 5594 #ifdef CONFIG_IPV6_SEG6_HMAC 5595 array[DEVCONF_SEG6_REQUIRE_HMAC] = cnf->seg6_require_hmac; 5596 #endif 5597 array[DEVCONF_ENHANCED_DAD] = cnf->enhanced_dad; 5598 array[DEVCONF_ADDR_GEN_MODE] = cnf->addr_gen_mode; 5599 array[DEVCONF_DISABLE_POLICY] = cnf->disable_policy; 5600 array[DEVCONF_NDISC_TCLASS] = cnf->ndisc_tclass; 5601 array[DEVCONF_RPL_SEG_ENABLED] = cnf->rpl_seg_enabled; 5602 array[DEVCONF_IOAM6_ENABLED] = cnf->ioam6_enabled; 5603 array[DEVCONF_IOAM6_ID] = cnf->ioam6_id; 5604 array[DEVCONF_IOAM6_ID_WIDE] = cnf->ioam6_id_wide; 5605 array[DEVCONF_NDISC_EVICT_NOCARRIER] = cnf->ndisc_evict_nocarrier; 5606 array[DEVCONF_ACCEPT_UNTRACKED_NA] = cnf->accept_untracked_na; 5607 array[DEVCONF_ACCEPT_RA_MIN_RTR_LFT] = cnf->accept_ra_min_rtr_lft; 5608 } 5609 5610 static inline size_t inet6_ifla6_size(void) 5611 { 5612 return nla_total_size(4) /* IFLA_INET6_FLAGS */ 5613 + nla_total_size(sizeof(struct ifla_cacheinfo)) 5614 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */ 5615 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */ 5616 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */ 5617 + nla_total_size(sizeof(struct in6_addr)) /* IFLA_INET6_TOKEN */ 5618 + nla_total_size(1) /* IFLA_INET6_ADDR_GEN_MODE */ 5619 + nla_total_size(4) /* IFLA_INET6_RA_MTU */ 5620 + 0; 5621 } 5622 5623 static inline size_t inet6_if_nlmsg_size(void) 5624 { 5625 return NLMSG_ALIGN(sizeof(struct ifinfomsg)) 5626 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */ 5627 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */ 5628 + nla_total_size(4) /* IFLA_MTU */ 5629 + nla_total_size(4) /* IFLA_LINK */ 5630 + nla_total_size(1) /* IFLA_OPERSTATE */ 5631 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */ 5632 } 5633 5634 static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib, 5635 int bytes) 5636 { 5637 int i; 5638 int pad = bytes - sizeof(u64) * ICMP6_MIB_MAX; 5639 BUG_ON(pad < 0); 5640 5641 /* Use put_unaligned() because stats may not be aligned for u64. */ 5642 put_unaligned(ICMP6_MIB_MAX, &stats[0]); 5643 for (i = 1; i < ICMP6_MIB_MAX; i++) 5644 put_unaligned(atomic_long_read(&mib[i]), &stats[i]); 5645 5646 memset(&stats[ICMP6_MIB_MAX], 0, pad); 5647 } 5648 5649 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu *mib, 5650 int bytes, size_t syncpoff) 5651 { 5652 int i, c; 5653 u64 buff[IPSTATS_MIB_MAX]; 5654 int pad = bytes - sizeof(u64) * IPSTATS_MIB_MAX; 5655 5656 BUG_ON(pad < 0); 5657 5658 memset(buff, 0, sizeof(buff)); 5659 buff[0] = IPSTATS_MIB_MAX; 5660 5661 for_each_possible_cpu(c) { 5662 for (i = 1; i < IPSTATS_MIB_MAX; i++) 5663 buff[i] += snmp_get_cpu_field64(mib, c, i, syncpoff); 5664 } 5665 5666 memcpy(stats, buff, IPSTATS_MIB_MAX * sizeof(u64)); 5667 memset(&stats[IPSTATS_MIB_MAX], 0, pad); 5668 } 5669 5670 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype, 5671 int bytes) 5672 { 5673 switch (attrtype) { 5674 case IFLA_INET6_STATS: 5675 __snmp6_fill_stats64(stats, idev->stats.ipv6, bytes, 5676 offsetof(struct ipstats_mib, syncp)); 5677 break; 5678 case IFLA_INET6_ICMP6STATS: 5679 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, bytes); 5680 break; 5681 } 5682 } 5683 5684 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev, 5685 u32 ext_filter_mask) 5686 { 5687 struct nlattr *nla; 5688 struct ifla_cacheinfo ci; 5689 5690 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags)) 5691 goto nla_put_failure; 5692 ci.max_reasm_len = IPV6_MAXPLEN; 5693 ci.tstamp = cstamp_delta(idev->tstamp); 5694 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time); 5695 ci.retrans_time = jiffies_to_msecs(NEIGH_VAR(idev->nd_parms, RETRANS_TIME)); 5696 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci)) 5697 goto nla_put_failure; 5698 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32)); 5699 if (!nla) 5700 goto nla_put_failure; 5701 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla)); 5702 5703 /* XXX - MC not implemented */ 5704 5705 if (ext_filter_mask & RTEXT_FILTER_SKIP_STATS) 5706 return 0; 5707 5708 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64)); 5709 if (!nla) 5710 goto nla_put_failure; 5711 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla)); 5712 5713 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64)); 5714 if (!nla) 5715 goto nla_put_failure; 5716 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla)); 5717 5718 nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr)); 5719 if (!nla) 5720 goto nla_put_failure; 5721 read_lock_bh(&idev->lock); 5722 memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla)); 5723 read_unlock_bh(&idev->lock); 5724 5725 if (nla_put_u8(skb, IFLA_INET6_ADDR_GEN_MODE, idev->cnf.addr_gen_mode)) 5726 goto nla_put_failure; 5727 5728 if (idev->ra_mtu && 5729 nla_put_u32(skb, IFLA_INET6_RA_MTU, idev->ra_mtu)) 5730 goto nla_put_failure; 5731 5732 return 0; 5733 5734 nla_put_failure: 5735 return -EMSGSIZE; 5736 } 5737 5738 static size_t inet6_get_link_af_size(const struct net_device *dev, 5739 u32 ext_filter_mask) 5740 { 5741 if (!__in6_dev_get(dev)) 5742 return 0; 5743 5744 return inet6_ifla6_size(); 5745 } 5746 5747 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev, 5748 u32 ext_filter_mask) 5749 { 5750 struct inet6_dev *idev = __in6_dev_get(dev); 5751 5752 if (!idev) 5753 return -ENODATA; 5754 5755 if (inet6_fill_ifla6_attrs(skb, idev, ext_filter_mask) < 0) 5756 return -EMSGSIZE; 5757 5758 return 0; 5759 } 5760 5761 static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token, 5762 struct netlink_ext_ack *extack) 5763 { 5764 struct inet6_ifaddr *ifp; 5765 struct net_device *dev = idev->dev; 5766 bool clear_token, update_rs = false; 5767 struct in6_addr ll_addr; 5768 5769 ASSERT_RTNL(); 5770 5771 if (!token) 5772 return -EINVAL; 5773 5774 if (dev->flags & IFF_LOOPBACK) { 5775 NL_SET_ERR_MSG_MOD(extack, "Device is loopback"); 5776 return -EINVAL; 5777 } 5778 5779 if (dev->flags & IFF_NOARP) { 5780 NL_SET_ERR_MSG_MOD(extack, 5781 "Device does not do neighbour discovery"); 5782 return -EINVAL; 5783 } 5784 5785 if (!ipv6_accept_ra(idev)) { 5786 NL_SET_ERR_MSG_MOD(extack, 5787 "Router advertisement is disabled on device"); 5788 return -EINVAL; 5789 } 5790 5791 if (idev->cnf.rtr_solicits == 0) { 5792 NL_SET_ERR_MSG(extack, 5793 "Router solicitation is disabled on device"); 5794 return -EINVAL; 5795 } 5796 5797 write_lock_bh(&idev->lock); 5798 5799 BUILD_BUG_ON(sizeof(token->s6_addr) != 16); 5800 memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8); 5801 5802 write_unlock_bh(&idev->lock); 5803 5804 clear_token = ipv6_addr_any(token); 5805 if (clear_token) 5806 goto update_lft; 5807 5808 if (!idev->dead && (idev->if_flags & IF_READY) && 5809 !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE | 5810 IFA_F_OPTIMISTIC)) { 5811 /* If we're not ready, then normal ifup will take care 5812 * of this. Otherwise, we need to request our rs here. 5813 */ 5814 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters); 5815 update_rs = true; 5816 } 5817 5818 update_lft: 5819 write_lock_bh(&idev->lock); 5820 5821 if (update_rs) { 5822 idev->if_flags |= IF_RS_SENT; 5823 idev->rs_interval = rfc3315_s14_backoff_init( 5824 idev->cnf.rtr_solicit_interval); 5825 idev->rs_probes = 1; 5826 addrconf_mod_rs_timer(idev, idev->rs_interval); 5827 } 5828 5829 /* Well, that's kinda nasty ... */ 5830 list_for_each_entry(ifp, &idev->addr_list, if_list) { 5831 spin_lock(&ifp->lock); 5832 if (ifp->tokenized) { 5833 ifp->valid_lft = 0; 5834 ifp->prefered_lft = 0; 5835 } 5836 spin_unlock(&ifp->lock); 5837 } 5838 5839 write_unlock_bh(&idev->lock); 5840 inet6_ifinfo_notify(RTM_NEWLINK, idev); 5841 addrconf_verify_rtnl(dev_net(dev)); 5842 return 0; 5843 } 5844 5845 static const struct nla_policy inet6_af_policy[IFLA_INET6_MAX + 1] = { 5846 [IFLA_INET6_ADDR_GEN_MODE] = { .type = NLA_U8 }, 5847 [IFLA_INET6_TOKEN] = { .len = sizeof(struct in6_addr) }, 5848 [IFLA_INET6_RA_MTU] = { .type = NLA_REJECT, 5849 .reject_message = 5850 "IFLA_INET6_RA_MTU can not be set" }, 5851 }; 5852 5853 static int check_addr_gen_mode(int mode) 5854 { 5855 if (mode != IN6_ADDR_GEN_MODE_EUI64 && 5856 mode != IN6_ADDR_GEN_MODE_NONE && 5857 mode != IN6_ADDR_GEN_MODE_STABLE_PRIVACY && 5858 mode != IN6_ADDR_GEN_MODE_RANDOM) 5859 return -EINVAL; 5860 return 1; 5861 } 5862 5863 static int check_stable_privacy(struct inet6_dev *idev, struct net *net, 5864 int mode) 5865 { 5866 if (mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY && 5867 !idev->cnf.stable_secret.initialized && 5868 !net->ipv6.devconf_dflt->stable_secret.initialized) 5869 return -EINVAL; 5870 return 1; 5871 } 5872 5873 static int inet6_validate_link_af(const struct net_device *dev, 5874 const struct nlattr *nla, 5875 struct netlink_ext_ack *extack) 5876 { 5877 struct nlattr *tb[IFLA_INET6_MAX + 1]; 5878 struct inet6_dev *idev = NULL; 5879 int err; 5880 5881 if (dev) { 5882 idev = __in6_dev_get(dev); 5883 if (!idev) 5884 return -EAFNOSUPPORT; 5885 } 5886 5887 err = nla_parse_nested_deprecated(tb, IFLA_INET6_MAX, nla, 5888 inet6_af_policy, extack); 5889 if (err) 5890 return err; 5891 5892 if (!tb[IFLA_INET6_TOKEN] && !tb[IFLA_INET6_ADDR_GEN_MODE]) 5893 return -EINVAL; 5894 5895 if (tb[IFLA_INET6_ADDR_GEN_MODE]) { 5896 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]); 5897 5898 if (check_addr_gen_mode(mode) < 0) 5899 return -EINVAL; 5900 if (dev && check_stable_privacy(idev, dev_net(dev), mode) < 0) 5901 return -EINVAL; 5902 } 5903 5904 return 0; 5905 } 5906 5907 static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla, 5908 struct netlink_ext_ack *extack) 5909 { 5910 struct inet6_dev *idev = __in6_dev_get(dev); 5911 struct nlattr *tb[IFLA_INET6_MAX + 1]; 5912 int err; 5913 5914 if (!idev) 5915 return -EAFNOSUPPORT; 5916 5917 if (nla_parse_nested_deprecated(tb, IFLA_INET6_MAX, nla, NULL, NULL) < 0) 5918 return -EINVAL; 5919 5920 if (tb[IFLA_INET6_TOKEN]) { 5921 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN]), 5922 extack); 5923 if (err) 5924 return err; 5925 } 5926 5927 if (tb[IFLA_INET6_ADDR_GEN_MODE]) { 5928 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]); 5929 5930 idev->cnf.addr_gen_mode = mode; 5931 } 5932 5933 return 0; 5934 } 5935 5936 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev, 5937 u32 portid, u32 seq, int event, unsigned int flags) 5938 { 5939 struct net_device *dev = idev->dev; 5940 struct ifinfomsg *hdr; 5941 struct nlmsghdr *nlh; 5942 void *protoinfo; 5943 5944 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags); 5945 if (!nlh) 5946 return -EMSGSIZE; 5947 5948 hdr = nlmsg_data(nlh); 5949 hdr->ifi_family = AF_INET6; 5950 hdr->__ifi_pad = 0; 5951 hdr->ifi_type = dev->type; 5952 hdr->ifi_index = dev->ifindex; 5953 hdr->ifi_flags = dev_get_flags(dev); 5954 hdr->ifi_change = 0; 5955 5956 if (nla_put_string(skb, IFLA_IFNAME, dev->name) || 5957 (dev->addr_len && 5958 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) || 5959 nla_put_u32(skb, IFLA_MTU, dev->mtu) || 5960 (dev->ifindex != dev_get_iflink(dev) && 5961 nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))) || 5962 nla_put_u8(skb, IFLA_OPERSTATE, 5963 netif_running(dev) ? dev->operstate : IF_OPER_DOWN)) 5964 goto nla_put_failure; 5965 protoinfo = nla_nest_start_noflag(skb, IFLA_PROTINFO); 5966 if (!protoinfo) 5967 goto nla_put_failure; 5968 5969 if (inet6_fill_ifla6_attrs(skb, idev, 0) < 0) 5970 goto nla_put_failure; 5971 5972 nla_nest_end(skb, protoinfo); 5973 nlmsg_end(skb, nlh); 5974 return 0; 5975 5976 nla_put_failure: 5977 nlmsg_cancel(skb, nlh); 5978 return -EMSGSIZE; 5979 } 5980 5981 static int inet6_valid_dump_ifinfo(const struct nlmsghdr *nlh, 5982 struct netlink_ext_ack *extack) 5983 { 5984 struct ifinfomsg *ifm; 5985 5986 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) { 5987 NL_SET_ERR_MSG_MOD(extack, "Invalid header for link dump request"); 5988 return -EINVAL; 5989 } 5990 5991 if (nlmsg_attrlen(nlh, sizeof(*ifm))) { 5992 NL_SET_ERR_MSG_MOD(extack, "Invalid data after header"); 5993 return -EINVAL; 5994 } 5995 5996 ifm = nlmsg_data(nlh); 5997 if (ifm->__ifi_pad || ifm->ifi_type || ifm->ifi_flags || 5998 ifm->ifi_change || ifm->ifi_index) { 5999 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for dump request"); 6000 return -EINVAL; 6001 } 6002 6003 return 0; 6004 } 6005 6006 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb) 6007 { 6008 struct net *net = sock_net(skb->sk); 6009 int h, s_h; 6010 int idx = 0, s_idx; 6011 struct net_device *dev; 6012 struct inet6_dev *idev; 6013 struct hlist_head *head; 6014 6015 /* only requests using strict checking can pass data to 6016 * influence the dump 6017 */ 6018 if (cb->strict_check) { 6019 int err = inet6_valid_dump_ifinfo(cb->nlh, cb->extack); 6020 6021 if (err < 0) 6022 return err; 6023 } 6024 6025 s_h = cb->args[0]; 6026 s_idx = cb->args[1]; 6027 6028 rcu_read_lock(); 6029 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 6030 idx = 0; 6031 head = &net->dev_index_head[h]; 6032 hlist_for_each_entry_rcu(dev, head, index_hlist) { 6033 if (idx < s_idx) 6034 goto cont; 6035 idev = __in6_dev_get(dev); 6036 if (!idev) 6037 goto cont; 6038 if (inet6_fill_ifinfo(skb, idev, 6039 NETLINK_CB(cb->skb).portid, 6040 cb->nlh->nlmsg_seq, 6041 RTM_NEWLINK, NLM_F_MULTI) < 0) 6042 goto out; 6043 cont: 6044 idx++; 6045 } 6046 } 6047 out: 6048 rcu_read_unlock(); 6049 cb->args[1] = idx; 6050 cb->args[0] = h; 6051 6052 return skb->len; 6053 } 6054 6055 void inet6_ifinfo_notify(int event, struct inet6_dev *idev) 6056 { 6057 struct sk_buff *skb; 6058 struct net *net = dev_net(idev->dev); 6059 int err = -ENOBUFS; 6060 6061 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC); 6062 if (!skb) 6063 goto errout; 6064 6065 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0); 6066 if (err < 0) { 6067 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */ 6068 WARN_ON(err == -EMSGSIZE); 6069 kfree_skb(skb); 6070 goto errout; 6071 } 6072 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC); 6073 return; 6074 errout: 6075 if (err < 0) 6076 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err); 6077 } 6078 6079 static inline size_t inet6_prefix_nlmsg_size(void) 6080 { 6081 return NLMSG_ALIGN(sizeof(struct prefixmsg)) 6082 + nla_total_size(sizeof(struct in6_addr)) 6083 + nla_total_size(sizeof(struct prefix_cacheinfo)); 6084 } 6085 6086 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev, 6087 struct prefix_info *pinfo, u32 portid, u32 seq, 6088 int event, unsigned int flags) 6089 { 6090 struct prefixmsg *pmsg; 6091 struct nlmsghdr *nlh; 6092 struct prefix_cacheinfo ci; 6093 6094 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags); 6095 if (!nlh) 6096 return -EMSGSIZE; 6097 6098 pmsg = nlmsg_data(nlh); 6099 pmsg->prefix_family = AF_INET6; 6100 pmsg->prefix_pad1 = 0; 6101 pmsg->prefix_pad2 = 0; 6102 pmsg->prefix_ifindex = idev->dev->ifindex; 6103 pmsg->prefix_len = pinfo->prefix_len; 6104 pmsg->prefix_type = pinfo->type; 6105 pmsg->prefix_pad3 = 0; 6106 pmsg->prefix_flags = 0; 6107 if (pinfo->onlink) 6108 pmsg->prefix_flags |= IF_PREFIX_ONLINK; 6109 if (pinfo->autoconf) 6110 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF; 6111 6112 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix)) 6113 goto nla_put_failure; 6114 ci.preferred_time = ntohl(pinfo->prefered); 6115 ci.valid_time = ntohl(pinfo->valid); 6116 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci)) 6117 goto nla_put_failure; 6118 nlmsg_end(skb, nlh); 6119 return 0; 6120 6121 nla_put_failure: 6122 nlmsg_cancel(skb, nlh); 6123 return -EMSGSIZE; 6124 } 6125 6126 static void inet6_prefix_notify(int event, struct inet6_dev *idev, 6127 struct prefix_info *pinfo) 6128 { 6129 struct sk_buff *skb; 6130 struct net *net = dev_net(idev->dev); 6131 int err = -ENOBUFS; 6132 6133 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC); 6134 if (!skb) 6135 goto errout; 6136 6137 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0); 6138 if (err < 0) { 6139 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */ 6140 WARN_ON(err == -EMSGSIZE); 6141 kfree_skb(skb); 6142 goto errout; 6143 } 6144 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC); 6145 return; 6146 errout: 6147 if (err < 0) 6148 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err); 6149 } 6150 6151 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 6152 { 6153 struct net *net = dev_net(ifp->idev->dev); 6154 6155 if (event) 6156 ASSERT_RTNL(); 6157 6158 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp); 6159 6160 switch (event) { 6161 case RTM_NEWADDR: 6162 /* 6163 * If the address was optimistic we inserted the route at the 6164 * start of our DAD process, so we don't need to do it again. 6165 * If the device was taken down in the middle of the DAD 6166 * cycle there is a race where we could get here without a 6167 * host route, so nothing to insert. That will be fixed when 6168 * the device is brought up. 6169 */ 6170 if (ifp->rt && !rcu_access_pointer(ifp->rt->fib6_node)) { 6171 ip6_ins_rt(net, ifp->rt); 6172 } else if (!ifp->rt && (ifp->idev->dev->flags & IFF_UP)) { 6173 pr_warn("BUG: Address %pI6c on device %s is missing its host route.\n", 6174 &ifp->addr, ifp->idev->dev->name); 6175 } 6176 6177 if (ifp->idev->cnf.forwarding) 6178 addrconf_join_anycast(ifp); 6179 if (!ipv6_addr_any(&ifp->peer_addr)) 6180 addrconf_prefix_route(&ifp->peer_addr, 128, 6181 ifp->rt_priority, ifp->idev->dev, 6182 0, 0, GFP_ATOMIC); 6183 break; 6184 case RTM_DELADDR: 6185 if (ifp->idev->cnf.forwarding) 6186 addrconf_leave_anycast(ifp); 6187 addrconf_leave_solict(ifp->idev, &ifp->addr); 6188 if (!ipv6_addr_any(&ifp->peer_addr)) { 6189 struct fib6_info *rt; 6190 6191 rt = addrconf_get_prefix_route(&ifp->peer_addr, 128, 6192 ifp->idev->dev, 0, 0, 6193 false); 6194 if (rt) 6195 ip6_del_rt(net, rt, false); 6196 } 6197 if (ifp->rt) { 6198 ip6_del_rt(net, ifp->rt, false); 6199 ifp->rt = NULL; 6200 } 6201 rt_genid_bump_ipv6(net); 6202 break; 6203 } 6204 atomic_inc(&net->ipv6.dev_addr_genid); 6205 } 6206 6207 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 6208 { 6209 if (likely(ifp->idev->dead == 0)) 6210 __ipv6_ifa_notify(event, ifp); 6211 } 6212 6213 #ifdef CONFIG_SYSCTL 6214 6215 static int addrconf_sysctl_forward(struct ctl_table *ctl, int write, 6216 void *buffer, size_t *lenp, loff_t *ppos) 6217 { 6218 int *valp = ctl->data; 6219 int val = *valp; 6220 loff_t pos = *ppos; 6221 struct ctl_table lctl; 6222 int ret; 6223 6224 /* 6225 * ctl->data points to idev->cnf.forwarding, we should 6226 * not modify it until we get the rtnl lock. 6227 */ 6228 lctl = *ctl; 6229 lctl.data = &val; 6230 6231 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 6232 6233 if (write) 6234 ret = addrconf_fixup_forwarding(ctl, valp, val); 6235 if (ret) 6236 *ppos = pos; 6237 return ret; 6238 } 6239 6240 static int addrconf_sysctl_mtu(struct ctl_table *ctl, int write, 6241 void *buffer, size_t *lenp, loff_t *ppos) 6242 { 6243 struct inet6_dev *idev = ctl->extra1; 6244 int min_mtu = IPV6_MIN_MTU; 6245 struct ctl_table lctl; 6246 6247 lctl = *ctl; 6248 lctl.extra1 = &min_mtu; 6249 lctl.extra2 = idev ? &idev->dev->mtu : NULL; 6250 6251 return proc_dointvec_minmax(&lctl, write, buffer, lenp, ppos); 6252 } 6253 6254 static void dev_disable_change(struct inet6_dev *idev) 6255 { 6256 struct netdev_notifier_info info; 6257 6258 if (!idev || !idev->dev) 6259 return; 6260 6261 netdev_notifier_info_init(&info, idev->dev); 6262 if (idev->cnf.disable_ipv6) 6263 addrconf_notify(NULL, NETDEV_DOWN, &info); 6264 else 6265 addrconf_notify(NULL, NETDEV_UP, &info); 6266 } 6267 6268 static void addrconf_disable_change(struct net *net, __s32 newf) 6269 { 6270 struct net_device *dev; 6271 struct inet6_dev *idev; 6272 6273 for_each_netdev(net, dev) { 6274 idev = __in6_dev_get(dev); 6275 if (idev) { 6276 int changed = (!idev->cnf.disable_ipv6) ^ (!newf); 6277 idev->cnf.disable_ipv6 = newf; 6278 if (changed) 6279 dev_disable_change(idev); 6280 } 6281 } 6282 } 6283 6284 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf) 6285 { 6286 struct net *net; 6287 int old; 6288 6289 if (!rtnl_trylock()) 6290 return restart_syscall(); 6291 6292 net = (struct net *)table->extra2; 6293 old = *p; 6294 *p = newf; 6295 6296 if (p == &net->ipv6.devconf_dflt->disable_ipv6) { 6297 rtnl_unlock(); 6298 return 0; 6299 } 6300 6301 if (p == &net->ipv6.devconf_all->disable_ipv6) { 6302 net->ipv6.devconf_dflt->disable_ipv6 = newf; 6303 addrconf_disable_change(net, newf); 6304 } else if ((!newf) ^ (!old)) 6305 dev_disable_change((struct inet6_dev *)table->extra1); 6306 6307 rtnl_unlock(); 6308 return 0; 6309 } 6310 6311 static int addrconf_sysctl_disable(struct ctl_table *ctl, int write, 6312 void *buffer, size_t *lenp, loff_t *ppos) 6313 { 6314 int *valp = ctl->data; 6315 int val = *valp; 6316 loff_t pos = *ppos; 6317 struct ctl_table lctl; 6318 int ret; 6319 6320 /* 6321 * ctl->data points to idev->cnf.disable_ipv6, we should 6322 * not modify it until we get the rtnl lock. 6323 */ 6324 lctl = *ctl; 6325 lctl.data = &val; 6326 6327 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 6328 6329 if (write) 6330 ret = addrconf_disable_ipv6(ctl, valp, val); 6331 if (ret) 6332 *ppos = pos; 6333 return ret; 6334 } 6335 6336 static int addrconf_sysctl_proxy_ndp(struct ctl_table *ctl, int write, 6337 void *buffer, size_t *lenp, loff_t *ppos) 6338 { 6339 int *valp = ctl->data; 6340 int ret; 6341 int old, new; 6342 6343 old = *valp; 6344 ret = proc_dointvec(ctl, write, buffer, lenp, ppos); 6345 new = *valp; 6346 6347 if (write && old != new) { 6348 struct net *net = ctl->extra2; 6349 6350 if (!rtnl_trylock()) 6351 return restart_syscall(); 6352 6353 if (valp == &net->ipv6.devconf_dflt->proxy_ndp) 6354 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 6355 NETCONFA_PROXY_NEIGH, 6356 NETCONFA_IFINDEX_DEFAULT, 6357 net->ipv6.devconf_dflt); 6358 else if (valp == &net->ipv6.devconf_all->proxy_ndp) 6359 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 6360 NETCONFA_PROXY_NEIGH, 6361 NETCONFA_IFINDEX_ALL, 6362 net->ipv6.devconf_all); 6363 else { 6364 struct inet6_dev *idev = ctl->extra1; 6365 6366 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 6367 NETCONFA_PROXY_NEIGH, 6368 idev->dev->ifindex, 6369 &idev->cnf); 6370 } 6371 rtnl_unlock(); 6372 } 6373 6374 return ret; 6375 } 6376 6377 static int addrconf_sysctl_addr_gen_mode(struct ctl_table *ctl, int write, 6378 void *buffer, size_t *lenp, 6379 loff_t *ppos) 6380 { 6381 int ret = 0; 6382 u32 new_val; 6383 struct inet6_dev *idev = (struct inet6_dev *)ctl->extra1; 6384 struct net *net = (struct net *)ctl->extra2; 6385 struct ctl_table tmp = { 6386 .data = &new_val, 6387 .maxlen = sizeof(new_val), 6388 .mode = ctl->mode, 6389 }; 6390 6391 if (!rtnl_trylock()) 6392 return restart_syscall(); 6393 6394 new_val = *((u32 *)ctl->data); 6395 6396 ret = proc_douintvec(&tmp, write, buffer, lenp, ppos); 6397 if (ret != 0) 6398 goto out; 6399 6400 if (write) { 6401 if (check_addr_gen_mode(new_val) < 0) { 6402 ret = -EINVAL; 6403 goto out; 6404 } 6405 6406 if (idev) { 6407 if (check_stable_privacy(idev, net, new_val) < 0) { 6408 ret = -EINVAL; 6409 goto out; 6410 } 6411 6412 if (idev->cnf.addr_gen_mode != new_val) { 6413 idev->cnf.addr_gen_mode = new_val; 6414 addrconf_init_auto_addrs(idev->dev); 6415 } 6416 } else if (&net->ipv6.devconf_all->addr_gen_mode == ctl->data) { 6417 struct net_device *dev; 6418 6419 net->ipv6.devconf_dflt->addr_gen_mode = new_val; 6420 for_each_netdev(net, dev) { 6421 idev = __in6_dev_get(dev); 6422 if (idev && 6423 idev->cnf.addr_gen_mode != new_val) { 6424 idev->cnf.addr_gen_mode = new_val; 6425 addrconf_init_auto_addrs(idev->dev); 6426 } 6427 } 6428 } 6429 6430 *((u32 *)ctl->data) = new_val; 6431 } 6432 6433 out: 6434 rtnl_unlock(); 6435 6436 return ret; 6437 } 6438 6439 static int addrconf_sysctl_stable_secret(struct ctl_table *ctl, int write, 6440 void *buffer, size_t *lenp, 6441 loff_t *ppos) 6442 { 6443 int err; 6444 struct in6_addr addr; 6445 char str[IPV6_MAX_STRLEN]; 6446 struct ctl_table lctl = *ctl; 6447 struct net *net = ctl->extra2; 6448 struct ipv6_stable_secret *secret = ctl->data; 6449 6450 if (&net->ipv6.devconf_all->stable_secret == ctl->data) 6451 return -EIO; 6452 6453 lctl.maxlen = IPV6_MAX_STRLEN; 6454 lctl.data = str; 6455 6456 if (!rtnl_trylock()) 6457 return restart_syscall(); 6458 6459 if (!write && !secret->initialized) { 6460 err = -EIO; 6461 goto out; 6462 } 6463 6464 err = snprintf(str, sizeof(str), "%pI6", &secret->secret); 6465 if (err >= sizeof(str)) { 6466 err = -EIO; 6467 goto out; 6468 } 6469 6470 err = proc_dostring(&lctl, write, buffer, lenp, ppos); 6471 if (err || !write) 6472 goto out; 6473 6474 if (in6_pton(str, -1, addr.in6_u.u6_addr8, -1, NULL) != 1) { 6475 err = -EIO; 6476 goto out; 6477 } 6478 6479 secret->initialized = true; 6480 secret->secret = addr; 6481 6482 if (&net->ipv6.devconf_dflt->stable_secret == ctl->data) { 6483 struct net_device *dev; 6484 6485 for_each_netdev(net, dev) { 6486 struct inet6_dev *idev = __in6_dev_get(dev); 6487 6488 if (idev) { 6489 idev->cnf.addr_gen_mode = 6490 IN6_ADDR_GEN_MODE_STABLE_PRIVACY; 6491 } 6492 } 6493 } else { 6494 struct inet6_dev *idev = ctl->extra1; 6495 6496 idev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY; 6497 } 6498 6499 out: 6500 rtnl_unlock(); 6501 6502 return err; 6503 } 6504 6505 static 6506 int addrconf_sysctl_ignore_routes_with_linkdown(struct ctl_table *ctl, 6507 int write, void *buffer, 6508 size_t *lenp, 6509 loff_t *ppos) 6510 { 6511 int *valp = ctl->data; 6512 int val = *valp; 6513 loff_t pos = *ppos; 6514 struct ctl_table lctl; 6515 int ret; 6516 6517 /* ctl->data points to idev->cnf.ignore_routes_when_linkdown 6518 * we should not modify it until we get the rtnl lock. 6519 */ 6520 lctl = *ctl; 6521 lctl.data = &val; 6522 6523 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 6524 6525 if (write) 6526 ret = addrconf_fixup_linkdown(ctl, valp, val); 6527 if (ret) 6528 *ppos = pos; 6529 return ret; 6530 } 6531 6532 static 6533 void addrconf_set_nopolicy(struct rt6_info *rt, int action) 6534 { 6535 if (rt) { 6536 if (action) 6537 rt->dst.flags |= DST_NOPOLICY; 6538 else 6539 rt->dst.flags &= ~DST_NOPOLICY; 6540 } 6541 } 6542 6543 static 6544 void addrconf_disable_policy_idev(struct inet6_dev *idev, int val) 6545 { 6546 struct inet6_ifaddr *ifa; 6547 6548 read_lock_bh(&idev->lock); 6549 list_for_each_entry(ifa, &idev->addr_list, if_list) { 6550 spin_lock(&ifa->lock); 6551 if (ifa->rt) { 6552 /* host routes only use builtin fib6_nh */ 6553 struct fib6_nh *nh = ifa->rt->fib6_nh; 6554 int cpu; 6555 6556 rcu_read_lock(); 6557 ifa->rt->dst_nopolicy = val ? true : false; 6558 if (nh->rt6i_pcpu) { 6559 for_each_possible_cpu(cpu) { 6560 struct rt6_info **rtp; 6561 6562 rtp = per_cpu_ptr(nh->rt6i_pcpu, cpu); 6563 addrconf_set_nopolicy(*rtp, val); 6564 } 6565 } 6566 rcu_read_unlock(); 6567 } 6568 spin_unlock(&ifa->lock); 6569 } 6570 read_unlock_bh(&idev->lock); 6571 } 6572 6573 static 6574 int addrconf_disable_policy(struct ctl_table *ctl, int *valp, int val) 6575 { 6576 struct inet6_dev *idev; 6577 struct net *net; 6578 6579 if (!rtnl_trylock()) 6580 return restart_syscall(); 6581 6582 *valp = val; 6583 6584 net = (struct net *)ctl->extra2; 6585 if (valp == &net->ipv6.devconf_dflt->disable_policy) { 6586 rtnl_unlock(); 6587 return 0; 6588 } 6589 6590 if (valp == &net->ipv6.devconf_all->disable_policy) { 6591 struct net_device *dev; 6592 6593 for_each_netdev(net, dev) { 6594 idev = __in6_dev_get(dev); 6595 if (idev) 6596 addrconf_disable_policy_idev(idev, val); 6597 } 6598 } else { 6599 idev = (struct inet6_dev *)ctl->extra1; 6600 addrconf_disable_policy_idev(idev, val); 6601 } 6602 6603 rtnl_unlock(); 6604 return 0; 6605 } 6606 6607 static int addrconf_sysctl_disable_policy(struct ctl_table *ctl, int write, 6608 void *buffer, size_t *lenp, loff_t *ppos) 6609 { 6610 int *valp = ctl->data; 6611 int val = *valp; 6612 loff_t pos = *ppos; 6613 struct ctl_table lctl; 6614 int ret; 6615 6616 lctl = *ctl; 6617 lctl.data = &val; 6618 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 6619 6620 if (write && (*valp != val)) 6621 ret = addrconf_disable_policy(ctl, valp, val); 6622 6623 if (ret) 6624 *ppos = pos; 6625 6626 return ret; 6627 } 6628 6629 static int minus_one = -1; 6630 static const int two_five_five = 255; 6631 static u32 ioam6_if_id_max = U16_MAX; 6632 6633 static const struct ctl_table addrconf_sysctl[] = { 6634 { 6635 .procname = "forwarding", 6636 .data = &ipv6_devconf.forwarding, 6637 .maxlen = sizeof(int), 6638 .mode = 0644, 6639 .proc_handler = addrconf_sysctl_forward, 6640 }, 6641 { 6642 .procname = "hop_limit", 6643 .data = &ipv6_devconf.hop_limit, 6644 .maxlen = sizeof(int), 6645 .mode = 0644, 6646 .proc_handler = proc_dointvec_minmax, 6647 .extra1 = (void *)SYSCTL_ONE, 6648 .extra2 = (void *)&two_five_five, 6649 }, 6650 { 6651 .procname = "mtu", 6652 .data = &ipv6_devconf.mtu6, 6653 .maxlen = sizeof(int), 6654 .mode = 0644, 6655 .proc_handler = addrconf_sysctl_mtu, 6656 }, 6657 { 6658 .procname = "accept_ra", 6659 .data = &ipv6_devconf.accept_ra, 6660 .maxlen = sizeof(int), 6661 .mode = 0644, 6662 .proc_handler = proc_dointvec, 6663 }, 6664 { 6665 .procname = "accept_redirects", 6666 .data = &ipv6_devconf.accept_redirects, 6667 .maxlen = sizeof(int), 6668 .mode = 0644, 6669 .proc_handler = proc_dointvec, 6670 }, 6671 { 6672 .procname = "autoconf", 6673 .data = &ipv6_devconf.autoconf, 6674 .maxlen = sizeof(int), 6675 .mode = 0644, 6676 .proc_handler = proc_dointvec, 6677 }, 6678 { 6679 .procname = "dad_transmits", 6680 .data = &ipv6_devconf.dad_transmits, 6681 .maxlen = sizeof(int), 6682 .mode = 0644, 6683 .proc_handler = proc_dointvec, 6684 }, 6685 { 6686 .procname = "router_solicitations", 6687 .data = &ipv6_devconf.rtr_solicits, 6688 .maxlen = sizeof(int), 6689 .mode = 0644, 6690 .proc_handler = proc_dointvec_minmax, 6691 .extra1 = &minus_one, 6692 }, 6693 { 6694 .procname = "router_solicitation_interval", 6695 .data = &ipv6_devconf.rtr_solicit_interval, 6696 .maxlen = sizeof(int), 6697 .mode = 0644, 6698 .proc_handler = proc_dointvec_jiffies, 6699 }, 6700 { 6701 .procname = "router_solicitation_max_interval", 6702 .data = &ipv6_devconf.rtr_solicit_max_interval, 6703 .maxlen = sizeof(int), 6704 .mode = 0644, 6705 .proc_handler = proc_dointvec_jiffies, 6706 }, 6707 { 6708 .procname = "router_solicitation_delay", 6709 .data = &ipv6_devconf.rtr_solicit_delay, 6710 .maxlen = sizeof(int), 6711 .mode = 0644, 6712 .proc_handler = proc_dointvec_jiffies, 6713 }, 6714 { 6715 .procname = "force_mld_version", 6716 .data = &ipv6_devconf.force_mld_version, 6717 .maxlen = sizeof(int), 6718 .mode = 0644, 6719 .proc_handler = proc_dointvec, 6720 }, 6721 { 6722 .procname = "mldv1_unsolicited_report_interval", 6723 .data = 6724 &ipv6_devconf.mldv1_unsolicited_report_interval, 6725 .maxlen = sizeof(int), 6726 .mode = 0644, 6727 .proc_handler = proc_dointvec_ms_jiffies, 6728 }, 6729 { 6730 .procname = "mldv2_unsolicited_report_interval", 6731 .data = 6732 &ipv6_devconf.mldv2_unsolicited_report_interval, 6733 .maxlen = sizeof(int), 6734 .mode = 0644, 6735 .proc_handler = proc_dointvec_ms_jiffies, 6736 }, 6737 { 6738 .procname = "use_tempaddr", 6739 .data = &ipv6_devconf.use_tempaddr, 6740 .maxlen = sizeof(int), 6741 .mode = 0644, 6742 .proc_handler = proc_dointvec, 6743 }, 6744 { 6745 .procname = "temp_valid_lft", 6746 .data = &ipv6_devconf.temp_valid_lft, 6747 .maxlen = sizeof(int), 6748 .mode = 0644, 6749 .proc_handler = proc_dointvec, 6750 }, 6751 { 6752 .procname = "temp_prefered_lft", 6753 .data = &ipv6_devconf.temp_prefered_lft, 6754 .maxlen = sizeof(int), 6755 .mode = 0644, 6756 .proc_handler = proc_dointvec, 6757 }, 6758 { 6759 .procname = "regen_max_retry", 6760 .data = &ipv6_devconf.regen_max_retry, 6761 .maxlen = sizeof(int), 6762 .mode = 0644, 6763 .proc_handler = proc_dointvec, 6764 }, 6765 { 6766 .procname = "max_desync_factor", 6767 .data = &ipv6_devconf.max_desync_factor, 6768 .maxlen = sizeof(int), 6769 .mode = 0644, 6770 .proc_handler = proc_dointvec, 6771 }, 6772 { 6773 .procname = "max_addresses", 6774 .data = &ipv6_devconf.max_addresses, 6775 .maxlen = sizeof(int), 6776 .mode = 0644, 6777 .proc_handler = proc_dointvec, 6778 }, 6779 { 6780 .procname = "accept_ra_defrtr", 6781 .data = &ipv6_devconf.accept_ra_defrtr, 6782 .maxlen = sizeof(int), 6783 .mode = 0644, 6784 .proc_handler = proc_dointvec, 6785 }, 6786 { 6787 .procname = "ra_defrtr_metric", 6788 .data = &ipv6_devconf.ra_defrtr_metric, 6789 .maxlen = sizeof(u32), 6790 .mode = 0644, 6791 .proc_handler = proc_douintvec_minmax, 6792 .extra1 = (void *)SYSCTL_ONE, 6793 }, 6794 { 6795 .procname = "accept_ra_min_hop_limit", 6796 .data = &ipv6_devconf.accept_ra_min_hop_limit, 6797 .maxlen = sizeof(int), 6798 .mode = 0644, 6799 .proc_handler = proc_dointvec, 6800 }, 6801 { 6802 .procname = "accept_ra_min_rtr_lft", 6803 .data = &ipv6_devconf.accept_ra_min_rtr_lft, 6804 .maxlen = sizeof(int), 6805 .mode = 0644, 6806 .proc_handler = proc_dointvec, 6807 }, 6808 { 6809 .procname = "accept_ra_pinfo", 6810 .data = &ipv6_devconf.accept_ra_pinfo, 6811 .maxlen = sizeof(int), 6812 .mode = 0644, 6813 .proc_handler = proc_dointvec, 6814 }, 6815 #ifdef CONFIG_IPV6_ROUTER_PREF 6816 { 6817 .procname = "accept_ra_rtr_pref", 6818 .data = &ipv6_devconf.accept_ra_rtr_pref, 6819 .maxlen = sizeof(int), 6820 .mode = 0644, 6821 .proc_handler = proc_dointvec, 6822 }, 6823 { 6824 .procname = "router_probe_interval", 6825 .data = &ipv6_devconf.rtr_probe_interval, 6826 .maxlen = sizeof(int), 6827 .mode = 0644, 6828 .proc_handler = proc_dointvec_jiffies, 6829 }, 6830 #ifdef CONFIG_IPV6_ROUTE_INFO 6831 { 6832 .procname = "accept_ra_rt_info_min_plen", 6833 .data = &ipv6_devconf.accept_ra_rt_info_min_plen, 6834 .maxlen = sizeof(int), 6835 .mode = 0644, 6836 .proc_handler = proc_dointvec, 6837 }, 6838 { 6839 .procname = "accept_ra_rt_info_max_plen", 6840 .data = &ipv6_devconf.accept_ra_rt_info_max_plen, 6841 .maxlen = sizeof(int), 6842 .mode = 0644, 6843 .proc_handler = proc_dointvec, 6844 }, 6845 #endif 6846 #endif 6847 { 6848 .procname = "proxy_ndp", 6849 .data = &ipv6_devconf.proxy_ndp, 6850 .maxlen = sizeof(int), 6851 .mode = 0644, 6852 .proc_handler = addrconf_sysctl_proxy_ndp, 6853 }, 6854 { 6855 .procname = "accept_source_route", 6856 .data = &ipv6_devconf.accept_source_route, 6857 .maxlen = sizeof(int), 6858 .mode = 0644, 6859 .proc_handler = proc_dointvec, 6860 }, 6861 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 6862 { 6863 .procname = "optimistic_dad", 6864 .data = &ipv6_devconf.optimistic_dad, 6865 .maxlen = sizeof(int), 6866 .mode = 0644, 6867 .proc_handler = proc_dointvec, 6868 }, 6869 { 6870 .procname = "use_optimistic", 6871 .data = &ipv6_devconf.use_optimistic, 6872 .maxlen = sizeof(int), 6873 .mode = 0644, 6874 .proc_handler = proc_dointvec, 6875 }, 6876 #endif 6877 #ifdef CONFIG_IPV6_MROUTE 6878 { 6879 .procname = "mc_forwarding", 6880 .data = &ipv6_devconf.mc_forwarding, 6881 .maxlen = sizeof(int), 6882 .mode = 0444, 6883 .proc_handler = proc_dointvec, 6884 }, 6885 #endif 6886 { 6887 .procname = "disable_ipv6", 6888 .data = &ipv6_devconf.disable_ipv6, 6889 .maxlen = sizeof(int), 6890 .mode = 0644, 6891 .proc_handler = addrconf_sysctl_disable, 6892 }, 6893 { 6894 .procname = "accept_dad", 6895 .data = &ipv6_devconf.accept_dad, 6896 .maxlen = sizeof(int), 6897 .mode = 0644, 6898 .proc_handler = proc_dointvec, 6899 }, 6900 { 6901 .procname = "force_tllao", 6902 .data = &ipv6_devconf.force_tllao, 6903 .maxlen = sizeof(int), 6904 .mode = 0644, 6905 .proc_handler = proc_dointvec 6906 }, 6907 { 6908 .procname = "ndisc_notify", 6909 .data = &ipv6_devconf.ndisc_notify, 6910 .maxlen = sizeof(int), 6911 .mode = 0644, 6912 .proc_handler = proc_dointvec 6913 }, 6914 { 6915 .procname = "suppress_frag_ndisc", 6916 .data = &ipv6_devconf.suppress_frag_ndisc, 6917 .maxlen = sizeof(int), 6918 .mode = 0644, 6919 .proc_handler = proc_dointvec 6920 }, 6921 { 6922 .procname = "accept_ra_from_local", 6923 .data = &ipv6_devconf.accept_ra_from_local, 6924 .maxlen = sizeof(int), 6925 .mode = 0644, 6926 .proc_handler = proc_dointvec, 6927 }, 6928 { 6929 .procname = "accept_ra_mtu", 6930 .data = &ipv6_devconf.accept_ra_mtu, 6931 .maxlen = sizeof(int), 6932 .mode = 0644, 6933 .proc_handler = proc_dointvec, 6934 }, 6935 { 6936 .procname = "stable_secret", 6937 .data = &ipv6_devconf.stable_secret, 6938 .maxlen = IPV6_MAX_STRLEN, 6939 .mode = 0600, 6940 .proc_handler = addrconf_sysctl_stable_secret, 6941 }, 6942 { 6943 .procname = "use_oif_addrs_only", 6944 .data = &ipv6_devconf.use_oif_addrs_only, 6945 .maxlen = sizeof(int), 6946 .mode = 0644, 6947 .proc_handler = proc_dointvec, 6948 }, 6949 { 6950 .procname = "ignore_routes_with_linkdown", 6951 .data = &ipv6_devconf.ignore_routes_with_linkdown, 6952 .maxlen = sizeof(int), 6953 .mode = 0644, 6954 .proc_handler = addrconf_sysctl_ignore_routes_with_linkdown, 6955 }, 6956 { 6957 .procname = "drop_unicast_in_l2_multicast", 6958 .data = &ipv6_devconf.drop_unicast_in_l2_multicast, 6959 .maxlen = sizeof(int), 6960 .mode = 0644, 6961 .proc_handler = proc_dointvec, 6962 }, 6963 { 6964 .procname = "drop_unsolicited_na", 6965 .data = &ipv6_devconf.drop_unsolicited_na, 6966 .maxlen = sizeof(int), 6967 .mode = 0644, 6968 .proc_handler = proc_dointvec, 6969 }, 6970 { 6971 .procname = "keep_addr_on_down", 6972 .data = &ipv6_devconf.keep_addr_on_down, 6973 .maxlen = sizeof(int), 6974 .mode = 0644, 6975 .proc_handler = proc_dointvec, 6976 6977 }, 6978 { 6979 .procname = "seg6_enabled", 6980 .data = &ipv6_devconf.seg6_enabled, 6981 .maxlen = sizeof(int), 6982 .mode = 0644, 6983 .proc_handler = proc_dointvec, 6984 }, 6985 #ifdef CONFIG_IPV6_SEG6_HMAC 6986 { 6987 .procname = "seg6_require_hmac", 6988 .data = &ipv6_devconf.seg6_require_hmac, 6989 .maxlen = sizeof(int), 6990 .mode = 0644, 6991 .proc_handler = proc_dointvec, 6992 }, 6993 #endif 6994 { 6995 .procname = "enhanced_dad", 6996 .data = &ipv6_devconf.enhanced_dad, 6997 .maxlen = sizeof(int), 6998 .mode = 0644, 6999 .proc_handler = proc_dointvec, 7000 }, 7001 { 7002 .procname = "addr_gen_mode", 7003 .data = &ipv6_devconf.addr_gen_mode, 7004 .maxlen = sizeof(int), 7005 .mode = 0644, 7006 .proc_handler = addrconf_sysctl_addr_gen_mode, 7007 }, 7008 { 7009 .procname = "disable_policy", 7010 .data = &ipv6_devconf.disable_policy, 7011 .maxlen = sizeof(int), 7012 .mode = 0644, 7013 .proc_handler = addrconf_sysctl_disable_policy, 7014 }, 7015 { 7016 .procname = "ndisc_tclass", 7017 .data = &ipv6_devconf.ndisc_tclass, 7018 .maxlen = sizeof(int), 7019 .mode = 0644, 7020 .proc_handler = proc_dointvec_minmax, 7021 .extra1 = (void *)SYSCTL_ZERO, 7022 .extra2 = (void *)&two_five_five, 7023 }, 7024 { 7025 .procname = "rpl_seg_enabled", 7026 .data = &ipv6_devconf.rpl_seg_enabled, 7027 .maxlen = sizeof(int), 7028 .mode = 0644, 7029 .proc_handler = proc_dointvec, 7030 }, 7031 { 7032 .procname = "ioam6_enabled", 7033 .data = &ipv6_devconf.ioam6_enabled, 7034 .maxlen = sizeof(u8), 7035 .mode = 0644, 7036 .proc_handler = proc_dou8vec_minmax, 7037 .extra1 = (void *)SYSCTL_ZERO, 7038 .extra2 = (void *)SYSCTL_ONE, 7039 }, 7040 { 7041 .procname = "ioam6_id", 7042 .data = &ipv6_devconf.ioam6_id, 7043 .maxlen = sizeof(u32), 7044 .mode = 0644, 7045 .proc_handler = proc_douintvec_minmax, 7046 .extra1 = (void *)SYSCTL_ZERO, 7047 .extra2 = (void *)&ioam6_if_id_max, 7048 }, 7049 { 7050 .procname = "ioam6_id_wide", 7051 .data = &ipv6_devconf.ioam6_id_wide, 7052 .maxlen = sizeof(u32), 7053 .mode = 0644, 7054 .proc_handler = proc_douintvec, 7055 }, 7056 { 7057 .procname = "ndisc_evict_nocarrier", 7058 .data = &ipv6_devconf.ndisc_evict_nocarrier, 7059 .maxlen = sizeof(u8), 7060 .mode = 0644, 7061 .proc_handler = proc_dou8vec_minmax, 7062 .extra1 = (void *)SYSCTL_ZERO, 7063 .extra2 = (void *)SYSCTL_ONE, 7064 }, 7065 { 7066 .procname = "accept_untracked_na", 7067 .data = &ipv6_devconf.accept_untracked_na, 7068 .maxlen = sizeof(int), 7069 .mode = 0644, 7070 .proc_handler = proc_dointvec_minmax, 7071 .extra1 = SYSCTL_ZERO, 7072 .extra2 = SYSCTL_TWO, 7073 }, 7074 { 7075 /* sentinel */ 7076 } 7077 }; 7078 7079 static int __addrconf_sysctl_register(struct net *net, char *dev_name, 7080 struct inet6_dev *idev, struct ipv6_devconf *p) 7081 { 7082 int i, ifindex; 7083 struct ctl_table *table; 7084 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ]; 7085 7086 table = kmemdup(addrconf_sysctl, sizeof(addrconf_sysctl), GFP_KERNEL_ACCOUNT); 7087 if (!table) 7088 goto out; 7089 7090 for (i = 0; table[i].data; i++) { 7091 table[i].data += (char *)p - (char *)&ipv6_devconf; 7092 /* If one of these is already set, then it is not safe to 7093 * overwrite either of them: this makes proc_dointvec_minmax 7094 * usable. 7095 */ 7096 if (!table[i].extra1 && !table[i].extra2) { 7097 table[i].extra1 = idev; /* embedded; no ref */ 7098 table[i].extra2 = net; 7099 } 7100 } 7101 7102 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name); 7103 7104 p->sysctl_header = register_net_sysctl(net, path, table); 7105 if (!p->sysctl_header) 7106 goto free; 7107 7108 if (!strcmp(dev_name, "all")) 7109 ifindex = NETCONFA_IFINDEX_ALL; 7110 else if (!strcmp(dev_name, "default")) 7111 ifindex = NETCONFA_IFINDEX_DEFAULT; 7112 else 7113 ifindex = idev->dev->ifindex; 7114 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, NETCONFA_ALL, 7115 ifindex, p); 7116 return 0; 7117 7118 free: 7119 kfree(table); 7120 out: 7121 return -ENOBUFS; 7122 } 7123 7124 static void __addrconf_sysctl_unregister(struct net *net, 7125 struct ipv6_devconf *p, int ifindex) 7126 { 7127 struct ctl_table *table; 7128 7129 if (!p->sysctl_header) 7130 return; 7131 7132 table = p->sysctl_header->ctl_table_arg; 7133 unregister_net_sysctl_table(p->sysctl_header); 7134 p->sysctl_header = NULL; 7135 kfree(table); 7136 7137 inet6_netconf_notify_devconf(net, RTM_DELNETCONF, 0, ifindex, NULL); 7138 } 7139 7140 static int addrconf_sysctl_register(struct inet6_dev *idev) 7141 { 7142 int err; 7143 7144 if (!sysctl_dev_name_is_allowed(idev->dev->name)) 7145 return -EINVAL; 7146 7147 err = neigh_sysctl_register(idev->dev, idev->nd_parms, 7148 &ndisc_ifinfo_sysctl_change); 7149 if (err) 7150 return err; 7151 err = __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name, 7152 idev, &idev->cnf); 7153 if (err) 7154 neigh_sysctl_unregister(idev->nd_parms); 7155 7156 return err; 7157 } 7158 7159 static void addrconf_sysctl_unregister(struct inet6_dev *idev) 7160 { 7161 __addrconf_sysctl_unregister(dev_net(idev->dev), &idev->cnf, 7162 idev->dev->ifindex); 7163 neigh_sysctl_unregister(idev->nd_parms); 7164 } 7165 7166 7167 #endif 7168 7169 static int __net_init addrconf_init_net(struct net *net) 7170 { 7171 int err = -ENOMEM; 7172 struct ipv6_devconf *all, *dflt; 7173 7174 spin_lock_init(&net->ipv6.addrconf_hash_lock); 7175 INIT_DEFERRABLE_WORK(&net->ipv6.addr_chk_work, addrconf_verify_work); 7176 net->ipv6.inet6_addr_lst = kcalloc(IN6_ADDR_HSIZE, 7177 sizeof(struct hlist_head), 7178 GFP_KERNEL); 7179 if (!net->ipv6.inet6_addr_lst) 7180 goto err_alloc_addr; 7181 7182 all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL); 7183 if (!all) 7184 goto err_alloc_all; 7185 7186 dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL); 7187 if (!dflt) 7188 goto err_alloc_dflt; 7189 7190 if (!net_eq(net, &init_net)) { 7191 switch (net_inherit_devconf()) { 7192 case 1: /* copy from init_net */ 7193 memcpy(all, init_net.ipv6.devconf_all, 7194 sizeof(ipv6_devconf)); 7195 memcpy(dflt, init_net.ipv6.devconf_dflt, 7196 sizeof(ipv6_devconf_dflt)); 7197 break; 7198 case 3: /* copy from the current netns */ 7199 memcpy(all, current->nsproxy->net_ns->ipv6.devconf_all, 7200 sizeof(ipv6_devconf)); 7201 memcpy(dflt, 7202 current->nsproxy->net_ns->ipv6.devconf_dflt, 7203 sizeof(ipv6_devconf_dflt)); 7204 break; 7205 case 0: 7206 case 2: 7207 /* use compiled values */ 7208 break; 7209 } 7210 } 7211 7212 /* these will be inherited by all namespaces */ 7213 dflt->autoconf = ipv6_defaults.autoconf; 7214 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6; 7215 7216 dflt->stable_secret.initialized = false; 7217 all->stable_secret.initialized = false; 7218 7219 net->ipv6.devconf_all = all; 7220 net->ipv6.devconf_dflt = dflt; 7221 7222 #ifdef CONFIG_SYSCTL 7223 err = __addrconf_sysctl_register(net, "all", NULL, all); 7224 if (err < 0) 7225 goto err_reg_all; 7226 7227 err = __addrconf_sysctl_register(net, "default", NULL, dflt); 7228 if (err < 0) 7229 goto err_reg_dflt; 7230 #endif 7231 return 0; 7232 7233 #ifdef CONFIG_SYSCTL 7234 err_reg_dflt: 7235 __addrconf_sysctl_unregister(net, all, NETCONFA_IFINDEX_ALL); 7236 err_reg_all: 7237 kfree(dflt); 7238 net->ipv6.devconf_dflt = NULL; 7239 #endif 7240 err_alloc_dflt: 7241 kfree(all); 7242 net->ipv6.devconf_all = NULL; 7243 err_alloc_all: 7244 kfree(net->ipv6.inet6_addr_lst); 7245 err_alloc_addr: 7246 return err; 7247 } 7248 7249 static void __net_exit addrconf_exit_net(struct net *net) 7250 { 7251 int i; 7252 7253 #ifdef CONFIG_SYSCTL 7254 __addrconf_sysctl_unregister(net, net->ipv6.devconf_dflt, 7255 NETCONFA_IFINDEX_DEFAULT); 7256 __addrconf_sysctl_unregister(net, net->ipv6.devconf_all, 7257 NETCONFA_IFINDEX_ALL); 7258 #endif 7259 kfree(net->ipv6.devconf_dflt); 7260 net->ipv6.devconf_dflt = NULL; 7261 kfree(net->ipv6.devconf_all); 7262 net->ipv6.devconf_all = NULL; 7263 7264 cancel_delayed_work_sync(&net->ipv6.addr_chk_work); 7265 /* 7266 * Check hash table, then free it. 7267 */ 7268 for (i = 0; i < IN6_ADDR_HSIZE; i++) 7269 WARN_ON_ONCE(!hlist_empty(&net->ipv6.inet6_addr_lst[i])); 7270 7271 kfree(net->ipv6.inet6_addr_lst); 7272 net->ipv6.inet6_addr_lst = NULL; 7273 } 7274 7275 static struct pernet_operations addrconf_ops = { 7276 .init = addrconf_init_net, 7277 .exit = addrconf_exit_net, 7278 }; 7279 7280 static struct rtnl_af_ops inet6_ops __read_mostly = { 7281 .family = AF_INET6, 7282 .fill_link_af = inet6_fill_link_af, 7283 .get_link_af_size = inet6_get_link_af_size, 7284 .validate_link_af = inet6_validate_link_af, 7285 .set_link_af = inet6_set_link_af, 7286 }; 7287 7288 /* 7289 * Init / cleanup code 7290 */ 7291 7292 int __init addrconf_init(void) 7293 { 7294 struct inet6_dev *idev; 7295 int err; 7296 7297 err = ipv6_addr_label_init(); 7298 if (err < 0) { 7299 pr_crit("%s: cannot initialize default policy table: %d\n", 7300 __func__, err); 7301 goto out; 7302 } 7303 7304 err = register_pernet_subsys(&addrconf_ops); 7305 if (err < 0) 7306 goto out_addrlabel; 7307 7308 addrconf_wq = create_workqueue("ipv6_addrconf"); 7309 if (!addrconf_wq) { 7310 err = -ENOMEM; 7311 goto out_nowq; 7312 } 7313 7314 rtnl_lock(); 7315 idev = ipv6_add_dev(blackhole_netdev); 7316 rtnl_unlock(); 7317 if (IS_ERR(idev)) { 7318 err = PTR_ERR(idev); 7319 goto errlo; 7320 } 7321 7322 ip6_route_init_special_entries(); 7323 7324 register_netdevice_notifier(&ipv6_dev_notf); 7325 7326 addrconf_verify(&init_net); 7327 7328 rtnl_af_register(&inet6_ops); 7329 7330 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETLINK, 7331 NULL, inet6_dump_ifinfo, 0); 7332 if (err < 0) 7333 goto errout; 7334 7335 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_NEWADDR, 7336 inet6_rtm_newaddr, NULL, 0); 7337 if (err < 0) 7338 goto errout; 7339 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_DELADDR, 7340 inet6_rtm_deladdr, NULL, 0); 7341 if (err < 0) 7342 goto errout; 7343 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETADDR, 7344 inet6_rtm_getaddr, inet6_dump_ifaddr, 7345 RTNL_FLAG_DOIT_UNLOCKED); 7346 if (err < 0) 7347 goto errout; 7348 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETMULTICAST, 7349 NULL, inet6_dump_ifmcaddr, 0); 7350 if (err < 0) 7351 goto errout; 7352 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETANYCAST, 7353 NULL, inet6_dump_ifacaddr, 0); 7354 if (err < 0) 7355 goto errout; 7356 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETNETCONF, 7357 inet6_netconf_get_devconf, 7358 inet6_netconf_dump_devconf, 7359 RTNL_FLAG_DOIT_UNLOCKED); 7360 if (err < 0) 7361 goto errout; 7362 err = ipv6_addr_label_rtnl_register(); 7363 if (err < 0) 7364 goto errout; 7365 7366 return 0; 7367 errout: 7368 rtnl_unregister_all(PF_INET6); 7369 rtnl_af_unregister(&inet6_ops); 7370 unregister_netdevice_notifier(&ipv6_dev_notf); 7371 errlo: 7372 destroy_workqueue(addrconf_wq); 7373 out_nowq: 7374 unregister_pernet_subsys(&addrconf_ops); 7375 out_addrlabel: 7376 ipv6_addr_label_cleanup(); 7377 out: 7378 return err; 7379 } 7380 7381 void addrconf_cleanup(void) 7382 { 7383 struct net_device *dev; 7384 7385 unregister_netdevice_notifier(&ipv6_dev_notf); 7386 unregister_pernet_subsys(&addrconf_ops); 7387 ipv6_addr_label_cleanup(); 7388 7389 rtnl_af_unregister(&inet6_ops); 7390 7391 rtnl_lock(); 7392 7393 /* clean dev list */ 7394 for_each_netdev(&init_net, dev) { 7395 if (__in6_dev_get(dev) == NULL) 7396 continue; 7397 addrconf_ifdown(dev, true); 7398 } 7399 addrconf_ifdown(init_net.loopback_dev, true); 7400 7401 rtnl_unlock(); 7402 7403 destroy_workqueue(addrconf_wq); 7404 } 7405