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_min_advance = REGEN_MIN_ADVANCE, 199 .regen_max_retry = REGEN_MAX_RETRY, 200 .max_desync_factor = MAX_DESYNC_FACTOR, 201 .max_addresses = IPV6_MAX_ADDRESSES, 202 .accept_ra_defrtr = 1, 203 .ra_defrtr_metric = IP6_RT_PRIO_USER, 204 .accept_ra_from_local = 0, 205 .accept_ra_min_hop_limit= 1, 206 .accept_ra_min_lft = 0, 207 .accept_ra_pinfo = 1, 208 #ifdef CONFIG_IPV6_ROUTER_PREF 209 .accept_ra_rtr_pref = 1, 210 .rtr_probe_interval = 60 * HZ, 211 #ifdef CONFIG_IPV6_ROUTE_INFO 212 .accept_ra_rt_info_min_plen = 0, 213 .accept_ra_rt_info_max_plen = 0, 214 #endif 215 #endif 216 .proxy_ndp = 0, 217 .accept_source_route = 0, /* we do not accept RH0 by default. */ 218 .disable_ipv6 = 0, 219 .accept_dad = 0, 220 .suppress_frag_ndisc = 1, 221 .accept_ra_mtu = 1, 222 .stable_secret = { 223 .initialized = false, 224 }, 225 .use_oif_addrs_only = 0, 226 .ignore_routes_with_linkdown = 0, 227 .keep_addr_on_down = 0, 228 .seg6_enabled = 0, 229 #ifdef CONFIG_IPV6_SEG6_HMAC 230 .seg6_require_hmac = 0, 231 #endif 232 .enhanced_dad = 1, 233 .addr_gen_mode = IN6_ADDR_GEN_MODE_EUI64, 234 .disable_policy = 0, 235 .rpl_seg_enabled = 0, 236 .ioam6_enabled = 0, 237 .ioam6_id = IOAM6_DEFAULT_IF_ID, 238 .ioam6_id_wide = IOAM6_DEFAULT_IF_ID_WIDE, 239 .ndisc_evict_nocarrier = 1, 240 .ra_honor_pio_life = 0, 241 }; 242 243 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = { 244 .forwarding = 0, 245 .hop_limit = IPV6_DEFAULT_HOPLIMIT, 246 .mtu6 = IPV6_MIN_MTU, 247 .accept_ra = 1, 248 .accept_redirects = 1, 249 .autoconf = 1, 250 .force_mld_version = 0, 251 .mldv1_unsolicited_report_interval = 10 * HZ, 252 .mldv2_unsolicited_report_interval = HZ, 253 .dad_transmits = 1, 254 .rtr_solicits = MAX_RTR_SOLICITATIONS, 255 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL, 256 .rtr_solicit_max_interval = RTR_SOLICITATION_MAX_INTERVAL, 257 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY, 258 .use_tempaddr = 0, 259 .temp_valid_lft = TEMP_VALID_LIFETIME, 260 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME, 261 .regen_min_advance = REGEN_MIN_ADVANCE, 262 .regen_max_retry = REGEN_MAX_RETRY, 263 .max_desync_factor = MAX_DESYNC_FACTOR, 264 .max_addresses = IPV6_MAX_ADDRESSES, 265 .accept_ra_defrtr = 1, 266 .ra_defrtr_metric = IP6_RT_PRIO_USER, 267 .accept_ra_from_local = 0, 268 .accept_ra_min_hop_limit= 1, 269 .accept_ra_min_lft = 0, 270 .accept_ra_pinfo = 1, 271 #ifdef CONFIG_IPV6_ROUTER_PREF 272 .accept_ra_rtr_pref = 1, 273 .rtr_probe_interval = 60 * HZ, 274 #ifdef CONFIG_IPV6_ROUTE_INFO 275 .accept_ra_rt_info_min_plen = 0, 276 .accept_ra_rt_info_max_plen = 0, 277 #endif 278 #endif 279 .proxy_ndp = 0, 280 .accept_source_route = 0, /* we do not accept RH0 by default. */ 281 .disable_ipv6 = 0, 282 .accept_dad = 1, 283 .suppress_frag_ndisc = 1, 284 .accept_ra_mtu = 1, 285 .stable_secret = { 286 .initialized = false, 287 }, 288 .use_oif_addrs_only = 0, 289 .ignore_routes_with_linkdown = 0, 290 .keep_addr_on_down = 0, 291 .seg6_enabled = 0, 292 #ifdef CONFIG_IPV6_SEG6_HMAC 293 .seg6_require_hmac = 0, 294 #endif 295 .enhanced_dad = 1, 296 .addr_gen_mode = IN6_ADDR_GEN_MODE_EUI64, 297 .disable_policy = 0, 298 .rpl_seg_enabled = 0, 299 .ioam6_enabled = 0, 300 .ioam6_id = IOAM6_DEFAULT_IF_ID, 301 .ioam6_id_wide = IOAM6_DEFAULT_IF_ID_WIDE, 302 .ndisc_evict_nocarrier = 1, 303 .ra_honor_pio_life = 0, 304 }; 305 306 /* Check if link is ready: is it up and is a valid qdisc available */ 307 static inline bool addrconf_link_ready(const struct net_device *dev) 308 { 309 return netif_oper_up(dev) && !qdisc_tx_is_noop(dev); 310 } 311 312 static void addrconf_del_rs_timer(struct inet6_dev *idev) 313 { 314 if (del_timer(&idev->rs_timer)) 315 __in6_dev_put(idev); 316 } 317 318 static void addrconf_del_dad_work(struct inet6_ifaddr *ifp) 319 { 320 if (cancel_delayed_work(&ifp->dad_work)) 321 __in6_ifa_put(ifp); 322 } 323 324 static void addrconf_mod_rs_timer(struct inet6_dev *idev, 325 unsigned long when) 326 { 327 if (!mod_timer(&idev->rs_timer, jiffies + when)) 328 in6_dev_hold(idev); 329 } 330 331 static void addrconf_mod_dad_work(struct inet6_ifaddr *ifp, 332 unsigned long delay) 333 { 334 in6_ifa_hold(ifp); 335 if (mod_delayed_work(addrconf_wq, &ifp->dad_work, delay)) 336 in6_ifa_put(ifp); 337 } 338 339 static int snmp6_alloc_dev(struct inet6_dev *idev) 340 { 341 int i; 342 343 idev->stats.ipv6 = alloc_percpu_gfp(struct ipstats_mib, GFP_KERNEL_ACCOUNT); 344 if (!idev->stats.ipv6) 345 goto err_ip; 346 347 for_each_possible_cpu(i) { 348 struct ipstats_mib *addrconf_stats; 349 addrconf_stats = per_cpu_ptr(idev->stats.ipv6, i); 350 u64_stats_init(&addrconf_stats->syncp); 351 } 352 353 354 idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device), 355 GFP_KERNEL); 356 if (!idev->stats.icmpv6dev) 357 goto err_icmp; 358 idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device), 359 GFP_KERNEL_ACCOUNT); 360 if (!idev->stats.icmpv6msgdev) 361 goto err_icmpmsg; 362 363 return 0; 364 365 err_icmpmsg: 366 kfree(idev->stats.icmpv6dev); 367 err_icmp: 368 free_percpu(idev->stats.ipv6); 369 err_ip: 370 return -ENOMEM; 371 } 372 373 static struct inet6_dev *ipv6_add_dev(struct net_device *dev) 374 { 375 struct inet6_dev *ndev; 376 int err = -ENOMEM; 377 378 ASSERT_RTNL(); 379 380 if (dev->mtu < IPV6_MIN_MTU && dev != blackhole_netdev) 381 return ERR_PTR(-EINVAL); 382 383 ndev = kzalloc(sizeof(*ndev), GFP_KERNEL_ACCOUNT); 384 if (!ndev) 385 return ERR_PTR(err); 386 387 rwlock_init(&ndev->lock); 388 ndev->dev = dev; 389 INIT_LIST_HEAD(&ndev->addr_list); 390 timer_setup(&ndev->rs_timer, addrconf_rs_timer, 0); 391 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf)); 392 393 if (ndev->cnf.stable_secret.initialized) 394 ndev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY; 395 396 ndev->cnf.mtu6 = dev->mtu; 397 ndev->ra_mtu = 0; 398 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl); 399 if (!ndev->nd_parms) { 400 kfree(ndev); 401 return ERR_PTR(err); 402 } 403 if (ndev->cnf.forwarding) 404 dev_disable_lro(dev); 405 /* We refer to the device */ 406 netdev_hold(dev, &ndev->dev_tracker, GFP_KERNEL); 407 408 if (snmp6_alloc_dev(ndev) < 0) { 409 netdev_dbg(dev, "%s: cannot allocate memory for statistics\n", 410 __func__); 411 neigh_parms_release(&nd_tbl, ndev->nd_parms); 412 netdev_put(dev, &ndev->dev_tracker); 413 kfree(ndev); 414 return ERR_PTR(err); 415 } 416 417 if (dev != blackhole_netdev) { 418 if (snmp6_register_dev(ndev) < 0) { 419 netdev_dbg(dev, "%s: cannot create /proc/net/dev_snmp6/%s\n", 420 __func__, dev->name); 421 goto err_release; 422 } 423 } 424 /* One reference from device. */ 425 refcount_set(&ndev->refcnt, 1); 426 427 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK)) 428 ndev->cnf.accept_dad = -1; 429 430 #if IS_ENABLED(CONFIG_IPV6_SIT) 431 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) { 432 pr_info("%s: Disabled Multicast RS\n", dev->name); 433 ndev->cnf.rtr_solicits = 0; 434 } 435 #endif 436 437 INIT_LIST_HEAD(&ndev->tempaddr_list); 438 ndev->desync_factor = U32_MAX; 439 if ((dev->flags&IFF_LOOPBACK) || 440 dev->type == ARPHRD_TUNNEL || 441 dev->type == ARPHRD_TUNNEL6 || 442 dev->type == ARPHRD_SIT || 443 dev->type == ARPHRD_NONE) { 444 ndev->cnf.use_tempaddr = -1; 445 } 446 447 ndev->token = in6addr_any; 448 449 if (netif_running(dev) && addrconf_link_ready(dev)) 450 ndev->if_flags |= IF_READY; 451 452 ipv6_mc_init_dev(ndev); 453 ndev->tstamp = jiffies; 454 if (dev != blackhole_netdev) { 455 err = addrconf_sysctl_register(ndev); 456 if (err) { 457 ipv6_mc_destroy_dev(ndev); 458 snmp6_unregister_dev(ndev); 459 goto err_release; 460 } 461 } 462 /* protected by rtnl_lock */ 463 rcu_assign_pointer(dev->ip6_ptr, ndev); 464 465 if (dev != blackhole_netdev) { 466 /* Join interface-local all-node multicast group */ 467 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allnodes); 468 469 /* Join all-node multicast group */ 470 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes); 471 472 /* Join all-router multicast group if forwarding is set */ 473 if (ndev->cnf.forwarding && (dev->flags & IFF_MULTICAST)) 474 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters); 475 } 476 return ndev; 477 478 err_release: 479 neigh_parms_release(&nd_tbl, ndev->nd_parms); 480 ndev->dead = 1; 481 in6_dev_finish_destroy(ndev); 482 return ERR_PTR(err); 483 } 484 485 static struct inet6_dev *ipv6_find_idev(struct net_device *dev) 486 { 487 struct inet6_dev *idev; 488 489 ASSERT_RTNL(); 490 491 idev = __in6_dev_get(dev); 492 if (!idev) { 493 idev = ipv6_add_dev(dev); 494 if (IS_ERR(idev)) 495 return idev; 496 } 497 498 if (dev->flags&IFF_UP) 499 ipv6_mc_up(idev); 500 return idev; 501 } 502 503 static int inet6_netconf_msgsize_devconf(int type) 504 { 505 int size = NLMSG_ALIGN(sizeof(struct netconfmsg)) 506 + nla_total_size(4); /* NETCONFA_IFINDEX */ 507 bool all = false; 508 509 if (type == NETCONFA_ALL) 510 all = true; 511 512 if (all || type == NETCONFA_FORWARDING) 513 size += nla_total_size(4); 514 #ifdef CONFIG_IPV6_MROUTE 515 if (all || type == NETCONFA_MC_FORWARDING) 516 size += nla_total_size(4); 517 #endif 518 if (all || type == NETCONFA_PROXY_NEIGH) 519 size += nla_total_size(4); 520 521 if (all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN) 522 size += nla_total_size(4); 523 524 return size; 525 } 526 527 static int inet6_netconf_fill_devconf(struct sk_buff *skb, int ifindex, 528 struct ipv6_devconf *devconf, u32 portid, 529 u32 seq, int event, unsigned int flags, 530 int type) 531 { 532 struct nlmsghdr *nlh; 533 struct netconfmsg *ncm; 534 bool all = false; 535 536 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg), 537 flags); 538 if (!nlh) 539 return -EMSGSIZE; 540 541 if (type == NETCONFA_ALL) 542 all = true; 543 544 ncm = nlmsg_data(nlh); 545 ncm->ncm_family = AF_INET6; 546 547 if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0) 548 goto nla_put_failure; 549 550 if (!devconf) 551 goto out; 552 553 if ((all || type == NETCONFA_FORWARDING) && 554 nla_put_s32(skb, NETCONFA_FORWARDING, 555 READ_ONCE(devconf->forwarding)) < 0) 556 goto nla_put_failure; 557 #ifdef CONFIG_IPV6_MROUTE 558 if ((all || type == NETCONFA_MC_FORWARDING) && 559 nla_put_s32(skb, NETCONFA_MC_FORWARDING, 560 atomic_read(&devconf->mc_forwarding)) < 0) 561 goto nla_put_failure; 562 #endif 563 if ((all || type == NETCONFA_PROXY_NEIGH) && 564 nla_put_s32(skb, NETCONFA_PROXY_NEIGH, 565 READ_ONCE(devconf->proxy_ndp)) < 0) 566 goto nla_put_failure; 567 568 if ((all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN) && 569 nla_put_s32(skb, NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN, 570 READ_ONCE(devconf->ignore_routes_with_linkdown)) < 0) 571 goto nla_put_failure; 572 573 out: 574 nlmsg_end(skb, nlh); 575 return 0; 576 577 nla_put_failure: 578 nlmsg_cancel(skb, nlh); 579 return -EMSGSIZE; 580 } 581 582 void inet6_netconf_notify_devconf(struct net *net, int event, int type, 583 int ifindex, struct ipv6_devconf *devconf) 584 { 585 struct sk_buff *skb; 586 int err = -ENOBUFS; 587 588 skb = nlmsg_new(inet6_netconf_msgsize_devconf(type), GFP_KERNEL); 589 if (!skb) 590 goto errout; 591 592 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 0, 0, 593 event, 0, type); 594 if (err < 0) { 595 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */ 596 WARN_ON(err == -EMSGSIZE); 597 kfree_skb(skb); 598 goto errout; 599 } 600 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_NETCONF, NULL, GFP_KERNEL); 601 return; 602 errout: 603 rtnl_set_sk_err(net, RTNLGRP_IPV6_NETCONF, err); 604 } 605 606 static const struct nla_policy devconf_ipv6_policy[NETCONFA_MAX+1] = { 607 [NETCONFA_IFINDEX] = { .len = sizeof(int) }, 608 [NETCONFA_FORWARDING] = { .len = sizeof(int) }, 609 [NETCONFA_PROXY_NEIGH] = { .len = sizeof(int) }, 610 [NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN] = { .len = sizeof(int) }, 611 }; 612 613 static int inet6_netconf_valid_get_req(struct sk_buff *skb, 614 const struct nlmsghdr *nlh, 615 struct nlattr **tb, 616 struct netlink_ext_ack *extack) 617 { 618 int i, err; 619 620 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(struct netconfmsg))) { 621 NL_SET_ERR_MSG_MOD(extack, "Invalid header for netconf get request"); 622 return -EINVAL; 623 } 624 625 if (!netlink_strict_get_check(skb)) 626 return nlmsg_parse_deprecated(nlh, sizeof(struct netconfmsg), 627 tb, NETCONFA_MAX, 628 devconf_ipv6_policy, extack); 629 630 err = nlmsg_parse_deprecated_strict(nlh, sizeof(struct netconfmsg), 631 tb, NETCONFA_MAX, 632 devconf_ipv6_policy, extack); 633 if (err) 634 return err; 635 636 for (i = 0; i <= NETCONFA_MAX; i++) { 637 if (!tb[i]) 638 continue; 639 640 switch (i) { 641 case NETCONFA_IFINDEX: 642 break; 643 default: 644 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in netconf get request"); 645 return -EINVAL; 646 } 647 } 648 649 return 0; 650 } 651 652 static int inet6_netconf_get_devconf(struct sk_buff *in_skb, 653 struct nlmsghdr *nlh, 654 struct netlink_ext_ack *extack) 655 { 656 struct net *net = sock_net(in_skb->sk); 657 struct nlattr *tb[NETCONFA_MAX+1]; 658 struct inet6_dev *in6_dev = NULL; 659 struct net_device *dev = NULL; 660 struct sk_buff *skb; 661 struct ipv6_devconf *devconf; 662 int ifindex; 663 int err; 664 665 err = inet6_netconf_valid_get_req(in_skb, nlh, tb, extack); 666 if (err < 0) 667 return err; 668 669 if (!tb[NETCONFA_IFINDEX]) 670 return -EINVAL; 671 672 err = -EINVAL; 673 ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]); 674 switch (ifindex) { 675 case NETCONFA_IFINDEX_ALL: 676 devconf = net->ipv6.devconf_all; 677 break; 678 case NETCONFA_IFINDEX_DEFAULT: 679 devconf = net->ipv6.devconf_dflt; 680 break; 681 default: 682 dev = dev_get_by_index(net, ifindex); 683 if (!dev) 684 return -EINVAL; 685 in6_dev = in6_dev_get(dev); 686 if (!in6_dev) 687 goto errout; 688 devconf = &in6_dev->cnf; 689 break; 690 } 691 692 err = -ENOBUFS; 693 skb = nlmsg_new(inet6_netconf_msgsize_devconf(NETCONFA_ALL), GFP_KERNEL); 694 if (!skb) 695 goto errout; 696 697 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 698 NETLINK_CB(in_skb).portid, 699 nlh->nlmsg_seq, RTM_NEWNETCONF, 0, 700 NETCONFA_ALL); 701 if (err < 0) { 702 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */ 703 WARN_ON(err == -EMSGSIZE); 704 kfree_skb(skb); 705 goto errout; 706 } 707 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid); 708 errout: 709 if (in6_dev) 710 in6_dev_put(in6_dev); 711 dev_put(dev); 712 return err; 713 } 714 715 /* Combine dev_addr_genid and dev_base_seq to detect changes. 716 */ 717 static u32 inet6_base_seq(const struct net *net) 718 { 719 u32 res = atomic_read(&net->ipv6.dev_addr_genid) + 720 net->dev_base_seq; 721 722 /* Must not return 0 (see nl_dump_check_consistent()). 723 * Chose a value far away from 0. 724 */ 725 if (!res) 726 res = 0x80000000; 727 return res; 728 } 729 730 static int inet6_netconf_dump_devconf(struct sk_buff *skb, 731 struct netlink_callback *cb) 732 { 733 const struct nlmsghdr *nlh = cb->nlh; 734 struct net *net = sock_net(skb->sk); 735 struct { 736 unsigned long ifindex; 737 unsigned int all_default; 738 } *ctx = (void *)cb->ctx; 739 struct net_device *dev; 740 struct inet6_dev *idev; 741 int err = 0; 742 743 if (cb->strict_check) { 744 struct netlink_ext_ack *extack = cb->extack; 745 struct netconfmsg *ncm; 746 747 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ncm))) { 748 NL_SET_ERR_MSG_MOD(extack, "Invalid header for netconf dump request"); 749 return -EINVAL; 750 } 751 752 if (nlmsg_attrlen(nlh, sizeof(*ncm))) { 753 NL_SET_ERR_MSG_MOD(extack, "Invalid data after header in netconf dump request"); 754 return -EINVAL; 755 } 756 } 757 758 rcu_read_lock(); 759 for_each_netdev_dump(net, dev, ctx->ifindex) { 760 idev = __in6_dev_get(dev); 761 if (!idev) 762 continue; 763 err = inet6_netconf_fill_devconf(skb, dev->ifindex, 764 &idev->cnf, 765 NETLINK_CB(cb->skb).portid, 766 nlh->nlmsg_seq, 767 RTM_NEWNETCONF, 768 NLM_F_MULTI, 769 NETCONFA_ALL); 770 if (err < 0) 771 goto done; 772 } 773 if (ctx->all_default == 0) { 774 err = inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL, 775 net->ipv6.devconf_all, 776 NETLINK_CB(cb->skb).portid, 777 nlh->nlmsg_seq, 778 RTM_NEWNETCONF, NLM_F_MULTI, 779 NETCONFA_ALL); 780 if (err < 0) 781 goto done; 782 ctx->all_default++; 783 } 784 if (ctx->all_default == 1) { 785 err = inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT, 786 net->ipv6.devconf_dflt, 787 NETLINK_CB(cb->skb).portid, 788 nlh->nlmsg_seq, 789 RTM_NEWNETCONF, NLM_F_MULTI, 790 NETCONFA_ALL); 791 if (err < 0) 792 goto done; 793 ctx->all_default++; 794 } 795 done: 796 if (err < 0 && likely(skb->len)) 797 err = skb->len; 798 rcu_read_unlock(); 799 return err; 800 } 801 802 #ifdef CONFIG_SYSCTL 803 static void dev_forward_change(struct inet6_dev *idev) 804 { 805 struct net_device *dev; 806 struct inet6_ifaddr *ifa; 807 LIST_HEAD(tmp_addr_list); 808 809 if (!idev) 810 return; 811 dev = idev->dev; 812 if (idev->cnf.forwarding) 813 dev_disable_lro(dev); 814 if (dev->flags & IFF_MULTICAST) { 815 if (idev->cnf.forwarding) { 816 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters); 817 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allrouters); 818 ipv6_dev_mc_inc(dev, &in6addr_sitelocal_allrouters); 819 } else { 820 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters); 821 ipv6_dev_mc_dec(dev, &in6addr_interfacelocal_allrouters); 822 ipv6_dev_mc_dec(dev, &in6addr_sitelocal_allrouters); 823 } 824 } 825 826 read_lock_bh(&idev->lock); 827 list_for_each_entry(ifa, &idev->addr_list, if_list) { 828 if (ifa->flags&IFA_F_TENTATIVE) 829 continue; 830 list_add_tail(&ifa->if_list_aux, &tmp_addr_list); 831 } 832 read_unlock_bh(&idev->lock); 833 834 while (!list_empty(&tmp_addr_list)) { 835 ifa = list_first_entry(&tmp_addr_list, 836 struct inet6_ifaddr, if_list_aux); 837 list_del(&ifa->if_list_aux); 838 if (idev->cnf.forwarding) 839 addrconf_join_anycast(ifa); 840 else 841 addrconf_leave_anycast(ifa); 842 } 843 844 inet6_netconf_notify_devconf(dev_net(dev), RTM_NEWNETCONF, 845 NETCONFA_FORWARDING, 846 dev->ifindex, &idev->cnf); 847 } 848 849 850 static void addrconf_forward_change(struct net *net, __s32 newf) 851 { 852 struct net_device *dev; 853 struct inet6_dev *idev; 854 855 for_each_netdev(net, dev) { 856 idev = __in6_dev_get(dev); 857 if (idev) { 858 int changed = (!idev->cnf.forwarding) ^ (!newf); 859 860 WRITE_ONCE(idev->cnf.forwarding, newf); 861 if (changed) 862 dev_forward_change(idev); 863 } 864 } 865 } 866 867 static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf) 868 { 869 struct net *net; 870 int old; 871 872 if (!rtnl_trylock()) 873 return restart_syscall(); 874 875 net = (struct net *)table->extra2; 876 old = *p; 877 WRITE_ONCE(*p, newf); 878 879 if (p == &net->ipv6.devconf_dflt->forwarding) { 880 if ((!newf) ^ (!old)) 881 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 882 NETCONFA_FORWARDING, 883 NETCONFA_IFINDEX_DEFAULT, 884 net->ipv6.devconf_dflt); 885 rtnl_unlock(); 886 return 0; 887 } 888 889 if (p == &net->ipv6.devconf_all->forwarding) { 890 int old_dflt = net->ipv6.devconf_dflt->forwarding; 891 892 WRITE_ONCE(net->ipv6.devconf_dflt->forwarding, newf); 893 if ((!newf) ^ (!old_dflt)) 894 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 895 NETCONFA_FORWARDING, 896 NETCONFA_IFINDEX_DEFAULT, 897 net->ipv6.devconf_dflt); 898 899 addrconf_forward_change(net, newf); 900 if ((!newf) ^ (!old)) 901 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 902 NETCONFA_FORWARDING, 903 NETCONFA_IFINDEX_ALL, 904 net->ipv6.devconf_all); 905 } else if ((!newf) ^ (!old)) 906 dev_forward_change((struct inet6_dev *)table->extra1); 907 rtnl_unlock(); 908 909 if (newf) 910 rt6_purge_dflt_routers(net); 911 return 1; 912 } 913 914 static void addrconf_linkdown_change(struct net *net, __s32 newf) 915 { 916 struct net_device *dev; 917 struct inet6_dev *idev; 918 919 for_each_netdev(net, dev) { 920 idev = __in6_dev_get(dev); 921 if (idev) { 922 int changed = (!idev->cnf.ignore_routes_with_linkdown) ^ (!newf); 923 924 WRITE_ONCE(idev->cnf.ignore_routes_with_linkdown, newf); 925 if (changed) 926 inet6_netconf_notify_devconf(dev_net(dev), 927 RTM_NEWNETCONF, 928 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN, 929 dev->ifindex, 930 &idev->cnf); 931 } 932 } 933 } 934 935 static int addrconf_fixup_linkdown(struct ctl_table *table, int *p, int newf) 936 { 937 struct net *net; 938 int old; 939 940 if (!rtnl_trylock()) 941 return restart_syscall(); 942 943 net = (struct net *)table->extra2; 944 old = *p; 945 WRITE_ONCE(*p, newf); 946 947 if (p == &net->ipv6.devconf_dflt->ignore_routes_with_linkdown) { 948 if ((!newf) ^ (!old)) 949 inet6_netconf_notify_devconf(net, 950 RTM_NEWNETCONF, 951 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN, 952 NETCONFA_IFINDEX_DEFAULT, 953 net->ipv6.devconf_dflt); 954 rtnl_unlock(); 955 return 0; 956 } 957 958 if (p == &net->ipv6.devconf_all->ignore_routes_with_linkdown) { 959 WRITE_ONCE(net->ipv6.devconf_dflt->ignore_routes_with_linkdown, newf); 960 addrconf_linkdown_change(net, newf); 961 if ((!newf) ^ (!old)) 962 inet6_netconf_notify_devconf(net, 963 RTM_NEWNETCONF, 964 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN, 965 NETCONFA_IFINDEX_ALL, 966 net->ipv6.devconf_all); 967 } 968 rtnl_unlock(); 969 970 return 1; 971 } 972 973 #endif 974 975 /* Nobody refers to this ifaddr, destroy it */ 976 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp) 977 { 978 WARN_ON(!hlist_unhashed(&ifp->addr_lst)); 979 980 #ifdef NET_REFCNT_DEBUG 981 pr_debug("%s\n", __func__); 982 #endif 983 984 in6_dev_put(ifp->idev); 985 986 if (cancel_delayed_work(&ifp->dad_work)) 987 pr_notice("delayed DAD work was pending while freeing ifa=%p\n", 988 ifp); 989 990 if (ifp->state != INET6_IFADDR_STATE_DEAD) { 991 pr_warn("Freeing alive inet6 address %p\n", ifp); 992 return; 993 } 994 995 kfree_rcu(ifp, rcu); 996 } 997 998 static void 999 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp) 1000 { 1001 struct list_head *p; 1002 int ifp_scope = ipv6_addr_src_scope(&ifp->addr); 1003 1004 /* 1005 * Each device address list is sorted in order of scope - 1006 * global before linklocal. 1007 */ 1008 list_for_each(p, &idev->addr_list) { 1009 struct inet6_ifaddr *ifa 1010 = list_entry(p, struct inet6_ifaddr, if_list); 1011 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr)) 1012 break; 1013 } 1014 1015 list_add_tail_rcu(&ifp->if_list, p); 1016 } 1017 1018 static u32 inet6_addr_hash(const struct net *net, const struct in6_addr *addr) 1019 { 1020 u32 val = ipv6_addr_hash(addr) ^ net_hash_mix(net); 1021 1022 return hash_32(val, IN6_ADDR_HSIZE_SHIFT); 1023 } 1024 1025 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr, 1026 struct net_device *dev, unsigned int hash) 1027 { 1028 struct inet6_ifaddr *ifp; 1029 1030 hlist_for_each_entry(ifp, &net->ipv6.inet6_addr_lst[hash], addr_lst) { 1031 if (ipv6_addr_equal(&ifp->addr, addr)) { 1032 if (!dev || ifp->idev->dev == dev) 1033 return true; 1034 } 1035 } 1036 return false; 1037 } 1038 1039 static int ipv6_add_addr_hash(struct net_device *dev, struct inet6_ifaddr *ifa) 1040 { 1041 struct net *net = dev_net(dev); 1042 unsigned int hash = inet6_addr_hash(net, &ifa->addr); 1043 int err = 0; 1044 1045 spin_lock_bh(&net->ipv6.addrconf_hash_lock); 1046 1047 /* Ignore adding duplicate addresses on an interface */ 1048 if (ipv6_chk_same_addr(net, &ifa->addr, dev, hash)) { 1049 netdev_dbg(dev, "ipv6_add_addr: already assigned\n"); 1050 err = -EEXIST; 1051 } else { 1052 hlist_add_head_rcu(&ifa->addr_lst, &net->ipv6.inet6_addr_lst[hash]); 1053 } 1054 1055 spin_unlock_bh(&net->ipv6.addrconf_hash_lock); 1056 1057 return err; 1058 } 1059 1060 /* On success it returns ifp with increased reference count */ 1061 1062 static struct inet6_ifaddr * 1063 ipv6_add_addr(struct inet6_dev *idev, struct ifa6_config *cfg, 1064 bool can_block, struct netlink_ext_ack *extack) 1065 { 1066 gfp_t gfp_flags = can_block ? GFP_KERNEL : GFP_ATOMIC; 1067 int addr_type = ipv6_addr_type(cfg->pfx); 1068 struct net *net = dev_net(idev->dev); 1069 struct inet6_ifaddr *ifa = NULL; 1070 struct fib6_info *f6i = NULL; 1071 int err = 0; 1072 1073 if (addr_type == IPV6_ADDR_ANY) { 1074 NL_SET_ERR_MSG_MOD(extack, "Invalid address"); 1075 return ERR_PTR(-EADDRNOTAVAIL); 1076 } else if (addr_type & IPV6_ADDR_MULTICAST && 1077 !(cfg->ifa_flags & IFA_F_MCAUTOJOIN)) { 1078 NL_SET_ERR_MSG_MOD(extack, "Cannot assign multicast address without \"IFA_F_MCAUTOJOIN\" flag"); 1079 return ERR_PTR(-EADDRNOTAVAIL); 1080 } else if (!(idev->dev->flags & IFF_LOOPBACK) && 1081 !netif_is_l3_master(idev->dev) && 1082 addr_type & IPV6_ADDR_LOOPBACK) { 1083 NL_SET_ERR_MSG_MOD(extack, "Cannot assign loopback address on this device"); 1084 return ERR_PTR(-EADDRNOTAVAIL); 1085 } 1086 1087 if (idev->dead) { 1088 NL_SET_ERR_MSG_MOD(extack, "device is going away"); 1089 err = -ENODEV; 1090 goto out; 1091 } 1092 1093 if (idev->cnf.disable_ipv6) { 1094 NL_SET_ERR_MSG_MOD(extack, "IPv6 is disabled on this device"); 1095 err = -EACCES; 1096 goto out; 1097 } 1098 1099 /* validator notifier needs to be blocking; 1100 * do not call in atomic context 1101 */ 1102 if (can_block) { 1103 struct in6_validator_info i6vi = { 1104 .i6vi_addr = *cfg->pfx, 1105 .i6vi_dev = idev, 1106 .extack = extack, 1107 }; 1108 1109 err = inet6addr_validator_notifier_call_chain(NETDEV_UP, &i6vi); 1110 err = notifier_to_errno(err); 1111 if (err < 0) 1112 goto out; 1113 } 1114 1115 ifa = kzalloc(sizeof(*ifa), gfp_flags | __GFP_ACCOUNT); 1116 if (!ifa) { 1117 err = -ENOBUFS; 1118 goto out; 1119 } 1120 1121 f6i = addrconf_f6i_alloc(net, idev, cfg->pfx, false, gfp_flags, extack); 1122 if (IS_ERR(f6i)) { 1123 err = PTR_ERR(f6i); 1124 f6i = NULL; 1125 goto out; 1126 } 1127 1128 neigh_parms_data_state_setall(idev->nd_parms); 1129 1130 ifa->addr = *cfg->pfx; 1131 if (cfg->peer_pfx) 1132 ifa->peer_addr = *cfg->peer_pfx; 1133 1134 spin_lock_init(&ifa->lock); 1135 INIT_DELAYED_WORK(&ifa->dad_work, addrconf_dad_work); 1136 INIT_HLIST_NODE(&ifa->addr_lst); 1137 ifa->scope = cfg->scope; 1138 ifa->prefix_len = cfg->plen; 1139 ifa->rt_priority = cfg->rt_priority; 1140 ifa->flags = cfg->ifa_flags; 1141 ifa->ifa_proto = cfg->ifa_proto; 1142 /* No need to add the TENTATIVE flag for addresses with NODAD */ 1143 if (!(cfg->ifa_flags & IFA_F_NODAD)) 1144 ifa->flags |= IFA_F_TENTATIVE; 1145 ifa->valid_lft = cfg->valid_lft; 1146 ifa->prefered_lft = cfg->preferred_lft; 1147 ifa->cstamp = ifa->tstamp = jiffies; 1148 ifa->tokenized = false; 1149 1150 ifa->rt = f6i; 1151 1152 ifa->idev = idev; 1153 in6_dev_hold(idev); 1154 1155 /* For caller */ 1156 refcount_set(&ifa->refcnt, 1); 1157 1158 rcu_read_lock(); 1159 1160 err = ipv6_add_addr_hash(idev->dev, ifa); 1161 if (err < 0) { 1162 rcu_read_unlock(); 1163 goto out; 1164 } 1165 1166 write_lock_bh(&idev->lock); 1167 1168 /* Add to inet6_dev unicast addr list. */ 1169 ipv6_link_dev_addr(idev, ifa); 1170 1171 if (ifa->flags&IFA_F_TEMPORARY) { 1172 list_add(&ifa->tmp_list, &idev->tempaddr_list); 1173 in6_ifa_hold(ifa); 1174 } 1175 1176 in6_ifa_hold(ifa); 1177 write_unlock_bh(&idev->lock); 1178 1179 rcu_read_unlock(); 1180 1181 inet6addr_notifier_call_chain(NETDEV_UP, ifa); 1182 out: 1183 if (unlikely(err < 0)) { 1184 fib6_info_release(f6i); 1185 1186 if (ifa) { 1187 if (ifa->idev) 1188 in6_dev_put(ifa->idev); 1189 kfree(ifa); 1190 } 1191 ifa = ERR_PTR(err); 1192 } 1193 1194 return ifa; 1195 } 1196 1197 enum cleanup_prefix_rt_t { 1198 CLEANUP_PREFIX_RT_NOP, /* no cleanup action for prefix route */ 1199 CLEANUP_PREFIX_RT_DEL, /* delete the prefix route */ 1200 CLEANUP_PREFIX_RT_EXPIRE, /* update the lifetime of the prefix route */ 1201 }; 1202 1203 /* 1204 * Check, whether the prefix for ifp would still need a prefix route 1205 * after deleting ifp. The function returns one of the CLEANUP_PREFIX_RT_* 1206 * constants. 1207 * 1208 * 1) we don't purge prefix if address was not permanent. 1209 * prefix is managed by its own lifetime. 1210 * 2) we also don't purge, if the address was IFA_F_NOPREFIXROUTE. 1211 * 3) if there are no addresses, delete prefix. 1212 * 4) if there are still other permanent address(es), 1213 * corresponding prefix is still permanent. 1214 * 5) if there are still other addresses with IFA_F_NOPREFIXROUTE, 1215 * don't purge the prefix, assume user space is managing it. 1216 * 6) otherwise, update prefix lifetime to the 1217 * longest valid lifetime among the corresponding 1218 * addresses on the device. 1219 * Note: subsequent RA will update lifetime. 1220 **/ 1221 static enum cleanup_prefix_rt_t 1222 check_cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long *expires) 1223 { 1224 struct inet6_ifaddr *ifa; 1225 struct inet6_dev *idev = ifp->idev; 1226 unsigned long lifetime; 1227 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_DEL; 1228 1229 *expires = jiffies; 1230 1231 list_for_each_entry(ifa, &idev->addr_list, if_list) { 1232 if (ifa == ifp) 1233 continue; 1234 if (ifa->prefix_len != ifp->prefix_len || 1235 !ipv6_prefix_equal(&ifa->addr, &ifp->addr, 1236 ifp->prefix_len)) 1237 continue; 1238 if (ifa->flags & (IFA_F_PERMANENT | IFA_F_NOPREFIXROUTE)) 1239 return CLEANUP_PREFIX_RT_NOP; 1240 1241 action = CLEANUP_PREFIX_RT_EXPIRE; 1242 1243 spin_lock(&ifa->lock); 1244 1245 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ); 1246 /* 1247 * Note: Because this address is 1248 * not permanent, lifetime < 1249 * LONG_MAX / HZ here. 1250 */ 1251 if (time_before(*expires, ifa->tstamp + lifetime * HZ)) 1252 *expires = ifa->tstamp + lifetime * HZ; 1253 spin_unlock(&ifa->lock); 1254 } 1255 1256 return action; 1257 } 1258 1259 static void 1260 cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long expires, 1261 bool del_rt, bool del_peer) 1262 { 1263 struct fib6_table *table; 1264 struct fib6_info *f6i; 1265 1266 f6i = addrconf_get_prefix_route(del_peer ? &ifp->peer_addr : &ifp->addr, 1267 ifp->prefix_len, 1268 ifp->idev->dev, 0, RTF_DEFAULT, true); 1269 if (f6i) { 1270 if (del_rt) 1271 ip6_del_rt(dev_net(ifp->idev->dev), f6i, false); 1272 else { 1273 if (!(f6i->fib6_flags & RTF_EXPIRES)) { 1274 table = f6i->fib6_table; 1275 spin_lock_bh(&table->tb6_lock); 1276 1277 fib6_set_expires(f6i, expires); 1278 fib6_add_gc_list(f6i); 1279 1280 spin_unlock_bh(&table->tb6_lock); 1281 } 1282 fib6_info_release(f6i); 1283 } 1284 } 1285 } 1286 1287 1288 /* This function wants to get referenced ifp and releases it before return */ 1289 1290 static void ipv6_del_addr(struct inet6_ifaddr *ifp) 1291 { 1292 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_NOP; 1293 struct net *net = dev_net(ifp->idev->dev); 1294 unsigned long expires; 1295 int state; 1296 1297 ASSERT_RTNL(); 1298 1299 spin_lock_bh(&ifp->lock); 1300 state = ifp->state; 1301 ifp->state = INET6_IFADDR_STATE_DEAD; 1302 spin_unlock_bh(&ifp->lock); 1303 1304 if (state == INET6_IFADDR_STATE_DEAD) 1305 goto out; 1306 1307 spin_lock_bh(&net->ipv6.addrconf_hash_lock); 1308 hlist_del_init_rcu(&ifp->addr_lst); 1309 spin_unlock_bh(&net->ipv6.addrconf_hash_lock); 1310 1311 write_lock_bh(&ifp->idev->lock); 1312 1313 if (ifp->flags&IFA_F_TEMPORARY) { 1314 list_del(&ifp->tmp_list); 1315 if (ifp->ifpub) { 1316 in6_ifa_put(ifp->ifpub); 1317 ifp->ifpub = NULL; 1318 } 1319 __in6_ifa_put(ifp); 1320 } 1321 1322 if (ifp->flags & IFA_F_PERMANENT && !(ifp->flags & IFA_F_NOPREFIXROUTE)) 1323 action = check_cleanup_prefix_route(ifp, &expires); 1324 1325 list_del_rcu(&ifp->if_list); 1326 __in6_ifa_put(ifp); 1327 1328 write_unlock_bh(&ifp->idev->lock); 1329 1330 addrconf_del_dad_work(ifp); 1331 1332 ipv6_ifa_notify(RTM_DELADDR, ifp); 1333 1334 inet6addr_notifier_call_chain(NETDEV_DOWN, ifp); 1335 1336 if (action != CLEANUP_PREFIX_RT_NOP) { 1337 cleanup_prefix_route(ifp, expires, 1338 action == CLEANUP_PREFIX_RT_DEL, false); 1339 } 1340 1341 /* clean up prefsrc entries */ 1342 rt6_remove_prefsrc(ifp); 1343 out: 1344 in6_ifa_put(ifp); 1345 } 1346 1347 static unsigned long ipv6_get_regen_advance(const struct inet6_dev *idev) 1348 { 1349 return READ_ONCE(idev->cnf.regen_min_advance) + 1350 READ_ONCE(idev->cnf.regen_max_retry) * 1351 READ_ONCE(idev->cnf.dad_transmits) * 1352 max(NEIGH_VAR(idev->nd_parms, RETRANS_TIME), HZ/100) / HZ; 1353 } 1354 1355 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, bool block) 1356 { 1357 struct inet6_dev *idev = ifp->idev; 1358 unsigned long tmp_tstamp, age; 1359 unsigned long regen_advance; 1360 unsigned long now = jiffies; 1361 u32 if_public_preferred_lft; 1362 s32 cnf_temp_preferred_lft; 1363 struct inet6_ifaddr *ift; 1364 struct ifa6_config cfg; 1365 long max_desync_factor; 1366 struct in6_addr addr; 1367 int ret = 0; 1368 1369 write_lock_bh(&idev->lock); 1370 1371 retry: 1372 in6_dev_hold(idev); 1373 if (READ_ONCE(idev->cnf.use_tempaddr) <= 0) { 1374 write_unlock_bh(&idev->lock); 1375 pr_info("%s: use_tempaddr is disabled\n", __func__); 1376 in6_dev_put(idev); 1377 ret = -1; 1378 goto out; 1379 } 1380 spin_lock_bh(&ifp->lock); 1381 if (ifp->regen_count++ >= READ_ONCE(idev->cnf.regen_max_retry)) { 1382 WRITE_ONCE(idev->cnf.use_tempaddr, -1); /*XXX*/ 1383 spin_unlock_bh(&ifp->lock); 1384 write_unlock_bh(&idev->lock); 1385 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n", 1386 __func__); 1387 in6_dev_put(idev); 1388 ret = -1; 1389 goto out; 1390 } 1391 in6_ifa_hold(ifp); 1392 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8); 1393 ipv6_gen_rnd_iid(&addr); 1394 1395 age = (now - ifp->tstamp) / HZ; 1396 1397 regen_advance = ipv6_get_regen_advance(idev); 1398 1399 /* recalculate max_desync_factor each time and update 1400 * idev->desync_factor if it's larger 1401 */ 1402 cnf_temp_preferred_lft = READ_ONCE(idev->cnf.temp_prefered_lft); 1403 max_desync_factor = min_t(long, 1404 READ_ONCE(idev->cnf.max_desync_factor), 1405 cnf_temp_preferred_lft - regen_advance); 1406 1407 if (unlikely(idev->desync_factor > max_desync_factor)) { 1408 if (max_desync_factor > 0) { 1409 get_random_bytes(&idev->desync_factor, 1410 sizeof(idev->desync_factor)); 1411 idev->desync_factor %= max_desync_factor; 1412 } else { 1413 idev->desync_factor = 0; 1414 } 1415 } 1416 1417 if_public_preferred_lft = ifp->prefered_lft; 1418 1419 memset(&cfg, 0, sizeof(cfg)); 1420 cfg.valid_lft = min_t(__u32, ifp->valid_lft, 1421 READ_ONCE(idev->cnf.temp_valid_lft) + age); 1422 cfg.preferred_lft = cnf_temp_preferred_lft + age - idev->desync_factor; 1423 cfg.preferred_lft = min_t(__u32, if_public_preferred_lft, cfg.preferred_lft); 1424 cfg.preferred_lft = min_t(__u32, cfg.valid_lft, cfg.preferred_lft); 1425 1426 cfg.plen = ifp->prefix_len; 1427 tmp_tstamp = ifp->tstamp; 1428 spin_unlock_bh(&ifp->lock); 1429 1430 write_unlock_bh(&idev->lock); 1431 1432 /* From RFC 4941: 1433 * 1434 * A temporary address is created only if this calculated Preferred 1435 * Lifetime is greater than REGEN_ADVANCE time units. In 1436 * particular, an implementation must not create a temporary address 1437 * with a zero Preferred Lifetime. 1438 * 1439 * ... 1440 * 1441 * When creating a temporary address, the lifetime values MUST be 1442 * derived from the corresponding prefix as follows: 1443 * 1444 * ... 1445 * 1446 * * Its Preferred Lifetime is the lower of the Preferred Lifetime 1447 * of the public address or TEMP_PREFERRED_LIFETIME - 1448 * DESYNC_FACTOR. 1449 * 1450 * To comply with the RFC's requirements, clamp the preferred lifetime 1451 * to a minimum of regen_advance, unless that would exceed valid_lft or 1452 * ifp->prefered_lft. 1453 * 1454 * Use age calculation as in addrconf_verify to avoid unnecessary 1455 * temporary addresses being generated. 1456 */ 1457 age = (now - tmp_tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ; 1458 if (cfg.preferred_lft <= regen_advance + age) { 1459 cfg.preferred_lft = regen_advance + age + 1; 1460 if (cfg.preferred_lft > cfg.valid_lft || 1461 cfg.preferred_lft > if_public_preferred_lft) { 1462 in6_ifa_put(ifp); 1463 in6_dev_put(idev); 1464 ret = -1; 1465 goto out; 1466 } 1467 } 1468 1469 cfg.ifa_flags = IFA_F_TEMPORARY; 1470 /* set in addrconf_prefix_rcv() */ 1471 if (ifp->flags & IFA_F_OPTIMISTIC) 1472 cfg.ifa_flags |= IFA_F_OPTIMISTIC; 1473 1474 cfg.pfx = &addr; 1475 cfg.scope = ipv6_addr_scope(cfg.pfx); 1476 1477 ift = ipv6_add_addr(idev, &cfg, block, NULL); 1478 if (IS_ERR(ift)) { 1479 in6_ifa_put(ifp); 1480 in6_dev_put(idev); 1481 pr_info("%s: retry temporary address regeneration\n", __func__); 1482 write_lock_bh(&idev->lock); 1483 goto retry; 1484 } 1485 1486 spin_lock_bh(&ift->lock); 1487 ift->ifpub = ifp; 1488 ift->cstamp = now; 1489 ift->tstamp = tmp_tstamp; 1490 spin_unlock_bh(&ift->lock); 1491 1492 addrconf_dad_start(ift); 1493 in6_ifa_put(ift); 1494 in6_dev_put(idev); 1495 out: 1496 return ret; 1497 } 1498 1499 /* 1500 * Choose an appropriate source address (RFC3484) 1501 */ 1502 enum { 1503 IPV6_SADDR_RULE_INIT = 0, 1504 IPV6_SADDR_RULE_LOCAL, 1505 IPV6_SADDR_RULE_SCOPE, 1506 IPV6_SADDR_RULE_PREFERRED, 1507 #ifdef CONFIG_IPV6_MIP6 1508 IPV6_SADDR_RULE_HOA, 1509 #endif 1510 IPV6_SADDR_RULE_OIF, 1511 IPV6_SADDR_RULE_LABEL, 1512 IPV6_SADDR_RULE_PRIVACY, 1513 IPV6_SADDR_RULE_ORCHID, 1514 IPV6_SADDR_RULE_PREFIX, 1515 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1516 IPV6_SADDR_RULE_NOT_OPTIMISTIC, 1517 #endif 1518 IPV6_SADDR_RULE_MAX 1519 }; 1520 1521 struct ipv6_saddr_score { 1522 int rule; 1523 int addr_type; 1524 struct inet6_ifaddr *ifa; 1525 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX); 1526 int scopedist; 1527 int matchlen; 1528 }; 1529 1530 struct ipv6_saddr_dst { 1531 const struct in6_addr *addr; 1532 int ifindex; 1533 int scope; 1534 int label; 1535 unsigned int prefs; 1536 }; 1537 1538 static inline int ipv6_saddr_preferred(int type) 1539 { 1540 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK)) 1541 return 1; 1542 return 0; 1543 } 1544 1545 static bool ipv6_use_optimistic_addr(const struct net *net, 1546 const struct inet6_dev *idev) 1547 { 1548 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1549 if (!idev) 1550 return false; 1551 if (!READ_ONCE(net->ipv6.devconf_all->optimistic_dad) && 1552 !READ_ONCE(idev->cnf.optimistic_dad)) 1553 return false; 1554 if (!READ_ONCE(net->ipv6.devconf_all->use_optimistic) && 1555 !READ_ONCE(idev->cnf.use_optimistic)) 1556 return false; 1557 1558 return true; 1559 #else 1560 return false; 1561 #endif 1562 } 1563 1564 static bool ipv6_allow_optimistic_dad(const struct net *net, 1565 const struct inet6_dev *idev) 1566 { 1567 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1568 if (!idev) 1569 return false; 1570 if (!READ_ONCE(net->ipv6.devconf_all->optimistic_dad) && 1571 !READ_ONCE(idev->cnf.optimistic_dad)) 1572 return false; 1573 1574 return true; 1575 #else 1576 return false; 1577 #endif 1578 } 1579 1580 static int ipv6_get_saddr_eval(struct net *net, 1581 struct ipv6_saddr_score *score, 1582 struct ipv6_saddr_dst *dst, 1583 int i) 1584 { 1585 int ret; 1586 1587 if (i <= score->rule) { 1588 switch (i) { 1589 case IPV6_SADDR_RULE_SCOPE: 1590 ret = score->scopedist; 1591 break; 1592 case IPV6_SADDR_RULE_PREFIX: 1593 ret = score->matchlen; 1594 break; 1595 default: 1596 ret = !!test_bit(i, score->scorebits); 1597 } 1598 goto out; 1599 } 1600 1601 switch (i) { 1602 case IPV6_SADDR_RULE_INIT: 1603 /* Rule 0: remember if hiscore is not ready yet */ 1604 ret = !!score->ifa; 1605 break; 1606 case IPV6_SADDR_RULE_LOCAL: 1607 /* Rule 1: Prefer same address */ 1608 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr); 1609 break; 1610 case IPV6_SADDR_RULE_SCOPE: 1611 /* Rule 2: Prefer appropriate scope 1612 * 1613 * ret 1614 * ^ 1615 * -1 | d 15 1616 * ---+--+-+---> scope 1617 * | 1618 * | d is scope of the destination. 1619 * B-d | \ 1620 * | \ <- smaller scope is better if 1621 * B-15 | \ if scope is enough for destination. 1622 * | ret = B - scope (-1 <= scope >= d <= 15). 1623 * d-C-1 | / 1624 * |/ <- greater is better 1625 * -C / if scope is not enough for destination. 1626 * /| ret = scope - C (-1 <= d < scope <= 15). 1627 * 1628 * d - C - 1 < B -15 (for all -1 <= d <= 15). 1629 * C > d + 14 - B >= 15 + 14 - B = 29 - B. 1630 * Assume B = 0 and we get C > 29. 1631 */ 1632 ret = __ipv6_addr_src_scope(score->addr_type); 1633 if (ret >= dst->scope) 1634 ret = -ret; 1635 else 1636 ret -= 128; /* 30 is enough */ 1637 score->scopedist = ret; 1638 break; 1639 case IPV6_SADDR_RULE_PREFERRED: 1640 { 1641 /* Rule 3: Avoid deprecated and optimistic addresses */ 1642 u8 avoid = IFA_F_DEPRECATED; 1643 1644 if (!ipv6_use_optimistic_addr(net, score->ifa->idev)) 1645 avoid |= IFA_F_OPTIMISTIC; 1646 ret = ipv6_saddr_preferred(score->addr_type) || 1647 !(score->ifa->flags & avoid); 1648 break; 1649 } 1650 #ifdef CONFIG_IPV6_MIP6 1651 case IPV6_SADDR_RULE_HOA: 1652 { 1653 /* Rule 4: Prefer home address */ 1654 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA); 1655 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome; 1656 break; 1657 } 1658 #endif 1659 case IPV6_SADDR_RULE_OIF: 1660 /* Rule 5: Prefer outgoing interface */ 1661 ret = (!dst->ifindex || 1662 dst->ifindex == score->ifa->idev->dev->ifindex); 1663 break; 1664 case IPV6_SADDR_RULE_LABEL: 1665 /* Rule 6: Prefer matching label */ 1666 ret = ipv6_addr_label(net, 1667 &score->ifa->addr, score->addr_type, 1668 score->ifa->idev->dev->ifindex) == dst->label; 1669 break; 1670 case IPV6_SADDR_RULE_PRIVACY: 1671 { 1672 /* Rule 7: Prefer public address 1673 * Note: prefer temporary address if use_tempaddr >= 2 1674 */ 1675 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ? 1676 !!(dst->prefs & IPV6_PREFER_SRC_TMP) : 1677 READ_ONCE(score->ifa->idev->cnf.use_tempaddr) >= 2; 1678 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp; 1679 break; 1680 } 1681 case IPV6_SADDR_RULE_ORCHID: 1682 /* Rule 8-: Prefer ORCHID vs ORCHID or 1683 * non-ORCHID vs non-ORCHID 1684 */ 1685 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^ 1686 ipv6_addr_orchid(dst->addr)); 1687 break; 1688 case IPV6_SADDR_RULE_PREFIX: 1689 /* Rule 8: Use longest matching prefix */ 1690 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr); 1691 if (ret > score->ifa->prefix_len) 1692 ret = score->ifa->prefix_len; 1693 score->matchlen = ret; 1694 break; 1695 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1696 case IPV6_SADDR_RULE_NOT_OPTIMISTIC: 1697 /* Optimistic addresses still have lower precedence than other 1698 * preferred addresses. 1699 */ 1700 ret = !(score->ifa->flags & IFA_F_OPTIMISTIC); 1701 break; 1702 #endif 1703 default: 1704 ret = 0; 1705 } 1706 1707 if (ret) 1708 __set_bit(i, score->scorebits); 1709 score->rule = i; 1710 out: 1711 return ret; 1712 } 1713 1714 static int __ipv6_dev_get_saddr(struct net *net, 1715 struct ipv6_saddr_dst *dst, 1716 struct inet6_dev *idev, 1717 struct ipv6_saddr_score *scores, 1718 int hiscore_idx) 1719 { 1720 struct ipv6_saddr_score *score = &scores[1 - hiscore_idx], *hiscore = &scores[hiscore_idx]; 1721 1722 list_for_each_entry_rcu(score->ifa, &idev->addr_list, if_list) { 1723 int i; 1724 1725 /* 1726 * - Tentative Address (RFC2462 section 5.4) 1727 * - A tentative address is not considered 1728 * "assigned to an interface" in the traditional 1729 * sense, unless it is also flagged as optimistic. 1730 * - Candidate Source Address (section 4) 1731 * - In any case, anycast addresses, multicast 1732 * addresses, and the unspecified address MUST 1733 * NOT be included in a candidate set. 1734 */ 1735 if ((score->ifa->flags & IFA_F_TENTATIVE) && 1736 (!(score->ifa->flags & IFA_F_OPTIMISTIC))) 1737 continue; 1738 1739 score->addr_type = __ipv6_addr_type(&score->ifa->addr); 1740 1741 if (unlikely(score->addr_type == IPV6_ADDR_ANY || 1742 score->addr_type & IPV6_ADDR_MULTICAST)) { 1743 net_dbg_ratelimited("ADDRCONF: unspecified / multicast address assigned as unicast address on %s", 1744 idev->dev->name); 1745 continue; 1746 } 1747 1748 score->rule = -1; 1749 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX); 1750 1751 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) { 1752 int minihiscore, miniscore; 1753 1754 minihiscore = ipv6_get_saddr_eval(net, hiscore, dst, i); 1755 miniscore = ipv6_get_saddr_eval(net, score, dst, i); 1756 1757 if (minihiscore > miniscore) { 1758 if (i == IPV6_SADDR_RULE_SCOPE && 1759 score->scopedist > 0) { 1760 /* 1761 * special case: 1762 * each remaining entry 1763 * has too small (not enough) 1764 * scope, because ifa entries 1765 * are sorted by their scope 1766 * values. 1767 */ 1768 goto out; 1769 } 1770 break; 1771 } else if (minihiscore < miniscore) { 1772 swap(hiscore, score); 1773 hiscore_idx = 1 - hiscore_idx; 1774 1775 /* restore our iterator */ 1776 score->ifa = hiscore->ifa; 1777 1778 break; 1779 } 1780 } 1781 } 1782 out: 1783 return hiscore_idx; 1784 } 1785 1786 static int ipv6_get_saddr_master(struct net *net, 1787 const struct net_device *dst_dev, 1788 const struct net_device *master, 1789 struct ipv6_saddr_dst *dst, 1790 struct ipv6_saddr_score *scores, 1791 int hiscore_idx) 1792 { 1793 struct inet6_dev *idev; 1794 1795 idev = __in6_dev_get(dst_dev); 1796 if (idev) 1797 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev, 1798 scores, hiscore_idx); 1799 1800 idev = __in6_dev_get(master); 1801 if (idev) 1802 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev, 1803 scores, hiscore_idx); 1804 1805 return hiscore_idx; 1806 } 1807 1808 int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev, 1809 const struct in6_addr *daddr, unsigned int prefs, 1810 struct in6_addr *saddr) 1811 { 1812 struct ipv6_saddr_score scores[2], *hiscore; 1813 struct ipv6_saddr_dst dst; 1814 struct inet6_dev *idev; 1815 struct net_device *dev; 1816 int dst_type; 1817 bool use_oif_addr = false; 1818 int hiscore_idx = 0; 1819 int ret = 0; 1820 1821 dst_type = __ipv6_addr_type(daddr); 1822 dst.addr = daddr; 1823 dst.ifindex = dst_dev ? dst_dev->ifindex : 0; 1824 dst.scope = __ipv6_addr_src_scope(dst_type); 1825 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex); 1826 dst.prefs = prefs; 1827 1828 scores[hiscore_idx].rule = -1; 1829 scores[hiscore_idx].ifa = NULL; 1830 1831 rcu_read_lock(); 1832 1833 /* Candidate Source Address (section 4) 1834 * - multicast and link-local destination address, 1835 * the set of candidate source address MUST only 1836 * include addresses assigned to interfaces 1837 * belonging to the same link as the outgoing 1838 * interface. 1839 * (- For site-local destination addresses, the 1840 * set of candidate source addresses MUST only 1841 * include addresses assigned to interfaces 1842 * belonging to the same site as the outgoing 1843 * interface.) 1844 * - "It is RECOMMENDED that the candidate source addresses 1845 * be the set of unicast addresses assigned to the 1846 * interface that will be used to send to the destination 1847 * (the 'outgoing' interface)." (RFC 6724) 1848 */ 1849 if (dst_dev) { 1850 idev = __in6_dev_get(dst_dev); 1851 if ((dst_type & IPV6_ADDR_MULTICAST) || 1852 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL || 1853 (idev && READ_ONCE(idev->cnf.use_oif_addrs_only))) { 1854 use_oif_addr = true; 1855 } 1856 } 1857 1858 if (use_oif_addr) { 1859 if (idev) 1860 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx); 1861 } else { 1862 const struct net_device *master; 1863 int master_idx = 0; 1864 1865 /* if dst_dev exists and is enslaved to an L3 device, then 1866 * prefer addresses from dst_dev and then the master over 1867 * any other enslaved devices in the L3 domain. 1868 */ 1869 master = l3mdev_master_dev_rcu(dst_dev); 1870 if (master) { 1871 master_idx = master->ifindex; 1872 1873 hiscore_idx = ipv6_get_saddr_master(net, dst_dev, 1874 master, &dst, 1875 scores, hiscore_idx); 1876 1877 if (scores[hiscore_idx].ifa) 1878 goto out; 1879 } 1880 1881 for_each_netdev_rcu(net, dev) { 1882 /* only consider addresses on devices in the 1883 * same L3 domain 1884 */ 1885 if (l3mdev_master_ifindex_rcu(dev) != master_idx) 1886 continue; 1887 idev = __in6_dev_get(dev); 1888 if (!idev) 1889 continue; 1890 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx); 1891 } 1892 } 1893 1894 out: 1895 hiscore = &scores[hiscore_idx]; 1896 if (!hiscore->ifa) 1897 ret = -EADDRNOTAVAIL; 1898 else 1899 *saddr = hiscore->ifa->addr; 1900 1901 rcu_read_unlock(); 1902 return ret; 1903 } 1904 EXPORT_SYMBOL(ipv6_dev_get_saddr); 1905 1906 static int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr, 1907 u32 banned_flags) 1908 { 1909 struct inet6_ifaddr *ifp; 1910 int err = -EADDRNOTAVAIL; 1911 1912 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) { 1913 if (ifp->scope > IFA_LINK) 1914 break; 1915 if (ifp->scope == IFA_LINK && 1916 !(ifp->flags & banned_flags)) { 1917 *addr = ifp->addr; 1918 err = 0; 1919 break; 1920 } 1921 } 1922 return err; 1923 } 1924 1925 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr, 1926 u32 banned_flags) 1927 { 1928 struct inet6_dev *idev; 1929 int err = -EADDRNOTAVAIL; 1930 1931 rcu_read_lock(); 1932 idev = __in6_dev_get(dev); 1933 if (idev) { 1934 read_lock_bh(&idev->lock); 1935 err = __ipv6_get_lladdr(idev, addr, banned_flags); 1936 read_unlock_bh(&idev->lock); 1937 } 1938 rcu_read_unlock(); 1939 return err; 1940 } 1941 1942 static int ipv6_count_addresses(const struct inet6_dev *idev) 1943 { 1944 const struct inet6_ifaddr *ifp; 1945 int cnt = 0; 1946 1947 rcu_read_lock(); 1948 list_for_each_entry_rcu(ifp, &idev->addr_list, if_list) 1949 cnt++; 1950 rcu_read_unlock(); 1951 return cnt; 1952 } 1953 1954 int ipv6_chk_addr(struct net *net, const struct in6_addr *addr, 1955 const struct net_device *dev, int strict) 1956 { 1957 return ipv6_chk_addr_and_flags(net, addr, dev, !dev, 1958 strict, IFA_F_TENTATIVE); 1959 } 1960 EXPORT_SYMBOL(ipv6_chk_addr); 1961 1962 /* device argument is used to find the L3 domain of interest. If 1963 * skip_dev_check is set, then the ifp device is not checked against 1964 * the passed in dev argument. So the 2 cases for addresses checks are: 1965 * 1. does the address exist in the L3 domain that dev is part of 1966 * (skip_dev_check = true), or 1967 * 1968 * 2. does the address exist on the specific device 1969 * (skip_dev_check = false) 1970 */ 1971 static struct net_device * 1972 __ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr, 1973 const struct net_device *dev, bool skip_dev_check, 1974 int strict, u32 banned_flags) 1975 { 1976 unsigned int hash = inet6_addr_hash(net, addr); 1977 struct net_device *l3mdev, *ndev; 1978 struct inet6_ifaddr *ifp; 1979 u32 ifp_flags; 1980 1981 rcu_read_lock(); 1982 1983 l3mdev = l3mdev_master_dev_rcu(dev); 1984 if (skip_dev_check) 1985 dev = NULL; 1986 1987 hlist_for_each_entry_rcu(ifp, &net->ipv6.inet6_addr_lst[hash], addr_lst) { 1988 ndev = ifp->idev->dev; 1989 1990 if (l3mdev_master_dev_rcu(ndev) != l3mdev) 1991 continue; 1992 1993 /* Decouple optimistic from tentative for evaluation here. 1994 * Ban optimistic addresses explicitly, when required. 1995 */ 1996 ifp_flags = (ifp->flags&IFA_F_OPTIMISTIC) 1997 ? (ifp->flags&~IFA_F_TENTATIVE) 1998 : ifp->flags; 1999 if (ipv6_addr_equal(&ifp->addr, addr) && 2000 !(ifp_flags&banned_flags) && 2001 (!dev || ndev == dev || 2002 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) { 2003 rcu_read_unlock(); 2004 return ndev; 2005 } 2006 } 2007 2008 rcu_read_unlock(); 2009 return NULL; 2010 } 2011 2012 int ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr, 2013 const struct net_device *dev, bool skip_dev_check, 2014 int strict, u32 banned_flags) 2015 { 2016 return __ipv6_chk_addr_and_flags(net, addr, dev, skip_dev_check, 2017 strict, banned_flags) ? 1 : 0; 2018 } 2019 EXPORT_SYMBOL(ipv6_chk_addr_and_flags); 2020 2021 2022 /* Compares an address/prefix_len with addresses on device @dev. 2023 * If one is found it returns true. 2024 */ 2025 bool ipv6_chk_custom_prefix(const struct in6_addr *addr, 2026 const unsigned int prefix_len, struct net_device *dev) 2027 { 2028 const struct inet6_ifaddr *ifa; 2029 const struct inet6_dev *idev; 2030 bool ret = false; 2031 2032 rcu_read_lock(); 2033 idev = __in6_dev_get(dev); 2034 if (idev) { 2035 list_for_each_entry_rcu(ifa, &idev->addr_list, if_list) { 2036 ret = ipv6_prefix_equal(addr, &ifa->addr, prefix_len); 2037 if (ret) 2038 break; 2039 } 2040 } 2041 rcu_read_unlock(); 2042 2043 return ret; 2044 } 2045 EXPORT_SYMBOL(ipv6_chk_custom_prefix); 2046 2047 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev) 2048 { 2049 const struct inet6_ifaddr *ifa; 2050 const struct inet6_dev *idev; 2051 int onlink; 2052 2053 onlink = 0; 2054 rcu_read_lock(); 2055 idev = __in6_dev_get(dev); 2056 if (idev) { 2057 list_for_each_entry_rcu(ifa, &idev->addr_list, if_list) { 2058 onlink = ipv6_prefix_equal(addr, &ifa->addr, 2059 ifa->prefix_len); 2060 if (onlink) 2061 break; 2062 } 2063 } 2064 rcu_read_unlock(); 2065 return onlink; 2066 } 2067 EXPORT_SYMBOL(ipv6_chk_prefix); 2068 2069 /** 2070 * ipv6_dev_find - find the first device with a given source address. 2071 * @net: the net namespace 2072 * @addr: the source address 2073 * @dev: used to find the L3 domain of interest 2074 * 2075 * The caller should be protected by RCU, or RTNL. 2076 */ 2077 struct net_device *ipv6_dev_find(struct net *net, const struct in6_addr *addr, 2078 struct net_device *dev) 2079 { 2080 return __ipv6_chk_addr_and_flags(net, addr, dev, !dev, 1, 2081 IFA_F_TENTATIVE); 2082 } 2083 EXPORT_SYMBOL(ipv6_dev_find); 2084 2085 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr, 2086 struct net_device *dev, int strict) 2087 { 2088 unsigned int hash = inet6_addr_hash(net, addr); 2089 struct inet6_ifaddr *ifp, *result = NULL; 2090 2091 rcu_read_lock(); 2092 hlist_for_each_entry_rcu(ifp, &net->ipv6.inet6_addr_lst[hash], addr_lst) { 2093 if (ipv6_addr_equal(&ifp->addr, addr)) { 2094 if (!dev || ifp->idev->dev == dev || 2095 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) { 2096 result = ifp; 2097 in6_ifa_hold(ifp); 2098 break; 2099 } 2100 } 2101 } 2102 rcu_read_unlock(); 2103 2104 return result; 2105 } 2106 2107 /* Gets referenced address, destroys ifaddr */ 2108 2109 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed) 2110 { 2111 if (dad_failed) 2112 ifp->flags |= IFA_F_DADFAILED; 2113 2114 if (ifp->flags&IFA_F_TEMPORARY) { 2115 struct inet6_ifaddr *ifpub; 2116 spin_lock_bh(&ifp->lock); 2117 ifpub = ifp->ifpub; 2118 if (ifpub) { 2119 in6_ifa_hold(ifpub); 2120 spin_unlock_bh(&ifp->lock); 2121 ipv6_create_tempaddr(ifpub, true); 2122 in6_ifa_put(ifpub); 2123 } else { 2124 spin_unlock_bh(&ifp->lock); 2125 } 2126 ipv6_del_addr(ifp); 2127 } else if (ifp->flags&IFA_F_PERMANENT || !dad_failed) { 2128 spin_lock_bh(&ifp->lock); 2129 addrconf_del_dad_work(ifp); 2130 ifp->flags |= IFA_F_TENTATIVE; 2131 if (dad_failed) 2132 ifp->flags &= ~IFA_F_OPTIMISTIC; 2133 spin_unlock_bh(&ifp->lock); 2134 if (dad_failed) 2135 ipv6_ifa_notify(0, ifp); 2136 in6_ifa_put(ifp); 2137 } else { 2138 ipv6_del_addr(ifp); 2139 } 2140 } 2141 2142 static int addrconf_dad_end(struct inet6_ifaddr *ifp) 2143 { 2144 int err = -ENOENT; 2145 2146 spin_lock_bh(&ifp->lock); 2147 if (ifp->state == INET6_IFADDR_STATE_DAD) { 2148 ifp->state = INET6_IFADDR_STATE_POSTDAD; 2149 err = 0; 2150 } 2151 spin_unlock_bh(&ifp->lock); 2152 2153 return err; 2154 } 2155 2156 void addrconf_dad_failure(struct sk_buff *skb, struct inet6_ifaddr *ifp) 2157 { 2158 struct inet6_dev *idev = ifp->idev; 2159 struct net *net = dev_net(idev->dev); 2160 int max_addresses; 2161 2162 if (addrconf_dad_end(ifp)) { 2163 in6_ifa_put(ifp); 2164 return; 2165 } 2166 2167 net_info_ratelimited("%s: IPv6 duplicate address %pI6c used by %pM detected!\n", 2168 ifp->idev->dev->name, &ifp->addr, eth_hdr(skb)->h_source); 2169 2170 spin_lock_bh(&ifp->lock); 2171 2172 if (ifp->flags & IFA_F_STABLE_PRIVACY) { 2173 struct in6_addr new_addr; 2174 struct inet6_ifaddr *ifp2; 2175 int retries = ifp->stable_privacy_retry + 1; 2176 struct ifa6_config cfg = { 2177 .pfx = &new_addr, 2178 .plen = ifp->prefix_len, 2179 .ifa_flags = ifp->flags, 2180 .valid_lft = ifp->valid_lft, 2181 .preferred_lft = ifp->prefered_lft, 2182 .scope = ifp->scope, 2183 }; 2184 2185 if (retries > net->ipv6.sysctl.idgen_retries) { 2186 net_info_ratelimited("%s: privacy stable address generation failed because of DAD conflicts!\n", 2187 ifp->idev->dev->name); 2188 goto errdad; 2189 } 2190 2191 new_addr = ifp->addr; 2192 if (ipv6_generate_stable_address(&new_addr, retries, 2193 idev)) 2194 goto errdad; 2195 2196 spin_unlock_bh(&ifp->lock); 2197 2198 max_addresses = READ_ONCE(idev->cnf.max_addresses); 2199 if (max_addresses && 2200 ipv6_count_addresses(idev) >= max_addresses) 2201 goto lock_errdad; 2202 2203 net_info_ratelimited("%s: generating new stable privacy address because of DAD conflict\n", 2204 ifp->idev->dev->name); 2205 2206 ifp2 = ipv6_add_addr(idev, &cfg, false, NULL); 2207 if (IS_ERR(ifp2)) 2208 goto lock_errdad; 2209 2210 spin_lock_bh(&ifp2->lock); 2211 ifp2->stable_privacy_retry = retries; 2212 ifp2->state = INET6_IFADDR_STATE_PREDAD; 2213 spin_unlock_bh(&ifp2->lock); 2214 2215 addrconf_mod_dad_work(ifp2, net->ipv6.sysctl.idgen_delay); 2216 in6_ifa_put(ifp2); 2217 lock_errdad: 2218 spin_lock_bh(&ifp->lock); 2219 } 2220 2221 errdad: 2222 /* transition from _POSTDAD to _ERRDAD */ 2223 ifp->state = INET6_IFADDR_STATE_ERRDAD; 2224 spin_unlock_bh(&ifp->lock); 2225 2226 addrconf_mod_dad_work(ifp, 0); 2227 in6_ifa_put(ifp); 2228 } 2229 2230 /* Join to solicited addr multicast group. 2231 * caller must hold RTNL */ 2232 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr) 2233 { 2234 struct in6_addr maddr; 2235 2236 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP)) 2237 return; 2238 2239 addrconf_addr_solict_mult(addr, &maddr); 2240 ipv6_dev_mc_inc(dev, &maddr); 2241 } 2242 2243 /* caller must hold RTNL */ 2244 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr) 2245 { 2246 struct in6_addr maddr; 2247 2248 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP)) 2249 return; 2250 2251 addrconf_addr_solict_mult(addr, &maddr); 2252 __ipv6_dev_mc_dec(idev, &maddr); 2253 } 2254 2255 /* caller must hold RTNL */ 2256 static void addrconf_join_anycast(struct inet6_ifaddr *ifp) 2257 { 2258 struct in6_addr addr; 2259 2260 if (ifp->prefix_len >= 127) /* RFC 6164 */ 2261 return; 2262 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len); 2263 if (ipv6_addr_any(&addr)) 2264 return; 2265 __ipv6_dev_ac_inc(ifp->idev, &addr); 2266 } 2267 2268 /* caller must hold RTNL */ 2269 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp) 2270 { 2271 struct in6_addr addr; 2272 2273 if (ifp->prefix_len >= 127) /* RFC 6164 */ 2274 return; 2275 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len); 2276 if (ipv6_addr_any(&addr)) 2277 return; 2278 __ipv6_dev_ac_dec(ifp->idev, &addr); 2279 } 2280 2281 static int addrconf_ifid_6lowpan(u8 *eui, struct net_device *dev) 2282 { 2283 switch (dev->addr_len) { 2284 case ETH_ALEN: 2285 memcpy(eui, dev->dev_addr, 3); 2286 eui[3] = 0xFF; 2287 eui[4] = 0xFE; 2288 memcpy(eui + 5, dev->dev_addr + 3, 3); 2289 break; 2290 case EUI64_ADDR_LEN: 2291 memcpy(eui, dev->dev_addr, EUI64_ADDR_LEN); 2292 eui[0] ^= 2; 2293 break; 2294 default: 2295 return -1; 2296 } 2297 2298 return 0; 2299 } 2300 2301 static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev) 2302 { 2303 const union fwnet_hwaddr *ha; 2304 2305 if (dev->addr_len != FWNET_ALEN) 2306 return -1; 2307 2308 ha = (const union fwnet_hwaddr *)dev->dev_addr; 2309 2310 memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id)); 2311 eui[0] ^= 2; 2312 return 0; 2313 } 2314 2315 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev) 2316 { 2317 /* XXX: inherit EUI-64 from other interface -- yoshfuji */ 2318 if (dev->addr_len != ARCNET_ALEN) 2319 return -1; 2320 memset(eui, 0, 7); 2321 eui[7] = *(u8 *)dev->dev_addr; 2322 return 0; 2323 } 2324 2325 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev) 2326 { 2327 if (dev->addr_len != INFINIBAND_ALEN) 2328 return -1; 2329 memcpy(eui, dev->dev_addr + 12, 8); 2330 eui[0] |= 2; 2331 return 0; 2332 } 2333 2334 static int __ipv6_isatap_ifid(u8 *eui, __be32 addr) 2335 { 2336 if (addr == 0) 2337 return -1; 2338 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) || 2339 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) || 2340 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) || 2341 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) || 2342 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) || 2343 ipv4_is_lbcast(addr)) ? 0x00 : 0x02; 2344 eui[1] = 0; 2345 eui[2] = 0x5E; 2346 eui[3] = 0xFE; 2347 memcpy(eui + 4, &addr, 4); 2348 return 0; 2349 } 2350 2351 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev) 2352 { 2353 if (dev->priv_flags & IFF_ISATAP) 2354 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr); 2355 return -1; 2356 } 2357 2358 static int addrconf_ifid_gre(u8 *eui, struct net_device *dev) 2359 { 2360 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr); 2361 } 2362 2363 static int addrconf_ifid_ip6tnl(u8 *eui, struct net_device *dev) 2364 { 2365 memcpy(eui, dev->perm_addr, 3); 2366 memcpy(eui + 5, dev->perm_addr + 3, 3); 2367 eui[3] = 0xFF; 2368 eui[4] = 0xFE; 2369 eui[0] ^= 2; 2370 return 0; 2371 } 2372 2373 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev) 2374 { 2375 switch (dev->type) { 2376 case ARPHRD_ETHER: 2377 case ARPHRD_FDDI: 2378 return addrconf_ifid_eui48(eui, dev); 2379 case ARPHRD_ARCNET: 2380 return addrconf_ifid_arcnet(eui, dev); 2381 case ARPHRD_INFINIBAND: 2382 return addrconf_ifid_infiniband(eui, dev); 2383 case ARPHRD_SIT: 2384 return addrconf_ifid_sit(eui, dev); 2385 case ARPHRD_IPGRE: 2386 case ARPHRD_TUNNEL: 2387 return addrconf_ifid_gre(eui, dev); 2388 case ARPHRD_6LOWPAN: 2389 return addrconf_ifid_6lowpan(eui, dev); 2390 case ARPHRD_IEEE1394: 2391 return addrconf_ifid_ieee1394(eui, dev); 2392 case ARPHRD_TUNNEL6: 2393 case ARPHRD_IP6GRE: 2394 case ARPHRD_RAWIP: 2395 return addrconf_ifid_ip6tnl(eui, dev); 2396 } 2397 return -1; 2398 } 2399 2400 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev) 2401 { 2402 int err = -1; 2403 struct inet6_ifaddr *ifp; 2404 2405 read_lock_bh(&idev->lock); 2406 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) { 2407 if (ifp->scope > IFA_LINK) 2408 break; 2409 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) { 2410 memcpy(eui, ifp->addr.s6_addr+8, 8); 2411 err = 0; 2412 break; 2413 } 2414 } 2415 read_unlock_bh(&idev->lock); 2416 return err; 2417 } 2418 2419 /* Generation of a randomized Interface Identifier 2420 * draft-ietf-6man-rfc4941bis, Section 3.3.1 2421 */ 2422 2423 static void ipv6_gen_rnd_iid(struct in6_addr *addr) 2424 { 2425 regen: 2426 get_random_bytes(&addr->s6_addr[8], 8); 2427 2428 /* <draft-ietf-6man-rfc4941bis-08.txt>, Section 3.3.1: 2429 * check if generated address is not inappropriate: 2430 * 2431 * - Reserved IPv6 Interface Identifiers 2432 * - XXX: already assigned to an address on the device 2433 */ 2434 2435 /* Subnet-router anycast: 0000:0000:0000:0000 */ 2436 if (!(addr->s6_addr32[2] | addr->s6_addr32[3])) 2437 goto regen; 2438 2439 /* IANA Ethernet block: 0200:5EFF:FE00:0000-0200:5EFF:FE00:5212 2440 * Proxy Mobile IPv6: 0200:5EFF:FE00:5213 2441 * IANA Ethernet block: 0200:5EFF:FE00:5214-0200:5EFF:FEFF:FFFF 2442 */ 2443 if (ntohl(addr->s6_addr32[2]) == 0x02005eff && 2444 (ntohl(addr->s6_addr32[3]) & 0Xff000000) == 0xfe000000) 2445 goto regen; 2446 2447 /* Reserved subnet anycast addresses */ 2448 if (ntohl(addr->s6_addr32[2]) == 0xfdffffff && 2449 ntohl(addr->s6_addr32[3]) >= 0Xffffff80) 2450 goto regen; 2451 } 2452 2453 /* 2454 * Add prefix route. 2455 */ 2456 2457 static void 2458 addrconf_prefix_route(struct in6_addr *pfx, int plen, u32 metric, 2459 struct net_device *dev, unsigned long expires, 2460 u32 flags, gfp_t gfp_flags) 2461 { 2462 struct fib6_config cfg = { 2463 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX, 2464 .fc_metric = metric ? : IP6_RT_PRIO_ADDRCONF, 2465 .fc_ifindex = dev->ifindex, 2466 .fc_expires = expires, 2467 .fc_dst_len = plen, 2468 .fc_flags = RTF_UP | flags, 2469 .fc_nlinfo.nl_net = dev_net(dev), 2470 .fc_protocol = RTPROT_KERNEL, 2471 .fc_type = RTN_UNICAST, 2472 }; 2473 2474 cfg.fc_dst = *pfx; 2475 2476 /* Prevent useless cloning on PtP SIT. 2477 This thing is done here expecting that the whole 2478 class of non-broadcast devices need not cloning. 2479 */ 2480 #if IS_ENABLED(CONFIG_IPV6_SIT) 2481 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT)) 2482 cfg.fc_flags |= RTF_NONEXTHOP; 2483 #endif 2484 2485 ip6_route_add(&cfg, gfp_flags, NULL); 2486 } 2487 2488 2489 static struct fib6_info *addrconf_get_prefix_route(const struct in6_addr *pfx, 2490 int plen, 2491 const struct net_device *dev, 2492 u32 flags, u32 noflags, 2493 bool no_gw) 2494 { 2495 struct fib6_node *fn; 2496 struct fib6_info *rt = NULL; 2497 struct fib6_table *table; 2498 u32 tb_id = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX; 2499 2500 table = fib6_get_table(dev_net(dev), tb_id); 2501 if (!table) 2502 return NULL; 2503 2504 rcu_read_lock(); 2505 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0, true); 2506 if (!fn) 2507 goto out; 2508 2509 for_each_fib6_node_rt_rcu(fn) { 2510 /* prefix routes only use builtin fib6_nh */ 2511 if (rt->nh) 2512 continue; 2513 2514 if (rt->fib6_nh->fib_nh_dev->ifindex != dev->ifindex) 2515 continue; 2516 if (no_gw && rt->fib6_nh->fib_nh_gw_family) 2517 continue; 2518 if ((rt->fib6_flags & flags) != flags) 2519 continue; 2520 if ((rt->fib6_flags & noflags) != 0) 2521 continue; 2522 if (!fib6_info_hold_safe(rt)) 2523 continue; 2524 break; 2525 } 2526 out: 2527 rcu_read_unlock(); 2528 return rt; 2529 } 2530 2531 2532 /* Create "default" multicast route to the interface */ 2533 2534 static void addrconf_add_mroute(struct net_device *dev) 2535 { 2536 struct fib6_config cfg = { 2537 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_LOCAL, 2538 .fc_metric = IP6_RT_PRIO_ADDRCONF, 2539 .fc_ifindex = dev->ifindex, 2540 .fc_dst_len = 8, 2541 .fc_flags = RTF_UP, 2542 .fc_type = RTN_MULTICAST, 2543 .fc_nlinfo.nl_net = dev_net(dev), 2544 .fc_protocol = RTPROT_KERNEL, 2545 }; 2546 2547 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0); 2548 2549 ip6_route_add(&cfg, GFP_KERNEL, NULL); 2550 } 2551 2552 static struct inet6_dev *addrconf_add_dev(struct net_device *dev) 2553 { 2554 struct inet6_dev *idev; 2555 2556 ASSERT_RTNL(); 2557 2558 idev = ipv6_find_idev(dev); 2559 if (IS_ERR(idev)) 2560 return idev; 2561 2562 if (idev->cnf.disable_ipv6) 2563 return ERR_PTR(-EACCES); 2564 2565 /* Add default multicast route */ 2566 if (!(dev->flags & IFF_LOOPBACK) && !netif_is_l3_master(dev)) 2567 addrconf_add_mroute(dev); 2568 2569 return idev; 2570 } 2571 2572 static void manage_tempaddrs(struct inet6_dev *idev, 2573 struct inet6_ifaddr *ifp, 2574 __u32 valid_lft, __u32 prefered_lft, 2575 bool create, unsigned long now) 2576 { 2577 u32 flags; 2578 struct inet6_ifaddr *ift; 2579 2580 read_lock_bh(&idev->lock); 2581 /* update all temporary addresses in the list */ 2582 list_for_each_entry(ift, &idev->tempaddr_list, tmp_list) { 2583 int age, max_valid, max_prefered; 2584 2585 if (ifp != ift->ifpub) 2586 continue; 2587 2588 /* RFC 4941 section 3.3: 2589 * If a received option will extend the lifetime of a public 2590 * address, the lifetimes of temporary addresses should 2591 * be extended, subject to the overall constraint that no 2592 * temporary addresses should ever remain "valid" or "preferred" 2593 * for a time longer than (TEMP_VALID_LIFETIME) or 2594 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), respectively. 2595 */ 2596 age = (now - ift->cstamp) / HZ; 2597 max_valid = READ_ONCE(idev->cnf.temp_valid_lft) - age; 2598 if (max_valid < 0) 2599 max_valid = 0; 2600 2601 max_prefered = READ_ONCE(idev->cnf.temp_prefered_lft) - 2602 idev->desync_factor - age; 2603 if (max_prefered < 0) 2604 max_prefered = 0; 2605 2606 if (valid_lft > max_valid) 2607 valid_lft = max_valid; 2608 2609 if (prefered_lft > max_prefered) 2610 prefered_lft = max_prefered; 2611 2612 spin_lock(&ift->lock); 2613 flags = ift->flags; 2614 ift->valid_lft = valid_lft; 2615 ift->prefered_lft = prefered_lft; 2616 ift->tstamp = now; 2617 if (prefered_lft > 0) 2618 ift->flags &= ~IFA_F_DEPRECATED; 2619 2620 spin_unlock(&ift->lock); 2621 if (!(flags&IFA_F_TENTATIVE)) 2622 ipv6_ifa_notify(0, ift); 2623 } 2624 2625 /* Also create a temporary address if it's enabled but no temporary 2626 * address currently exists. 2627 * However, we get called with valid_lft == 0, prefered_lft == 0, create == false 2628 * as part of cleanup (ie. deleting the mngtmpaddr). 2629 * We don't want that to result in creating a new temporary ip address. 2630 */ 2631 if (list_empty(&idev->tempaddr_list) && (valid_lft || prefered_lft)) 2632 create = true; 2633 2634 if (create && READ_ONCE(idev->cnf.use_tempaddr) > 0) { 2635 /* When a new public address is created as described 2636 * in [ADDRCONF], also create a new temporary address. 2637 */ 2638 read_unlock_bh(&idev->lock); 2639 ipv6_create_tempaddr(ifp, false); 2640 } else { 2641 read_unlock_bh(&idev->lock); 2642 } 2643 } 2644 2645 static bool is_addr_mode_generate_stable(struct inet6_dev *idev) 2646 { 2647 return idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY || 2648 idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_RANDOM; 2649 } 2650 2651 int addrconf_prefix_rcv_add_addr(struct net *net, struct net_device *dev, 2652 const struct prefix_info *pinfo, 2653 struct inet6_dev *in6_dev, 2654 const struct in6_addr *addr, int addr_type, 2655 u32 addr_flags, bool sllao, bool tokenized, 2656 __u32 valid_lft, u32 prefered_lft) 2657 { 2658 struct inet6_ifaddr *ifp = ipv6_get_ifaddr(net, addr, dev, 1); 2659 int create = 0, update_lft = 0; 2660 2661 if (!ifp && valid_lft) { 2662 int max_addresses = READ_ONCE(in6_dev->cnf.max_addresses); 2663 struct ifa6_config cfg = { 2664 .pfx = addr, 2665 .plen = pinfo->prefix_len, 2666 .ifa_flags = addr_flags, 2667 .valid_lft = valid_lft, 2668 .preferred_lft = prefered_lft, 2669 .scope = addr_type & IPV6_ADDR_SCOPE_MASK, 2670 .ifa_proto = IFAPROT_KERNEL_RA 2671 }; 2672 2673 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 2674 if ((READ_ONCE(net->ipv6.devconf_all->optimistic_dad) || 2675 READ_ONCE(in6_dev->cnf.optimistic_dad)) && 2676 !net->ipv6.devconf_all->forwarding && sllao) 2677 cfg.ifa_flags |= IFA_F_OPTIMISTIC; 2678 #endif 2679 2680 /* Do not allow to create too much of autoconfigured 2681 * addresses; this would be too easy way to crash kernel. 2682 */ 2683 if (!max_addresses || 2684 ipv6_count_addresses(in6_dev) < max_addresses) 2685 ifp = ipv6_add_addr(in6_dev, &cfg, false, NULL); 2686 2687 if (IS_ERR_OR_NULL(ifp)) 2688 return -1; 2689 2690 create = 1; 2691 spin_lock_bh(&ifp->lock); 2692 ifp->flags |= IFA_F_MANAGETEMPADDR; 2693 ifp->cstamp = jiffies; 2694 ifp->tokenized = tokenized; 2695 spin_unlock_bh(&ifp->lock); 2696 addrconf_dad_start(ifp); 2697 } 2698 2699 if (ifp) { 2700 u32 flags; 2701 unsigned long now; 2702 u32 stored_lft; 2703 2704 /* update lifetime (RFC2462 5.5.3 e) */ 2705 spin_lock_bh(&ifp->lock); 2706 now = jiffies; 2707 if (ifp->valid_lft > (now - ifp->tstamp) / HZ) 2708 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ; 2709 else 2710 stored_lft = 0; 2711 2712 /* RFC4862 Section 5.5.3e: 2713 * "Note that the preferred lifetime of the 2714 * corresponding address is always reset to 2715 * the Preferred Lifetime in the received 2716 * Prefix Information option, regardless of 2717 * whether the valid lifetime is also reset or 2718 * ignored." 2719 * 2720 * So we should always update prefered_lft here. 2721 */ 2722 update_lft = !create && stored_lft; 2723 2724 if (update_lft && !READ_ONCE(in6_dev->cnf.ra_honor_pio_life)) { 2725 const u32 minimum_lft = min_t(u32, 2726 stored_lft, MIN_VALID_LIFETIME); 2727 valid_lft = max(valid_lft, minimum_lft); 2728 } 2729 2730 if (update_lft) { 2731 ifp->valid_lft = valid_lft; 2732 ifp->prefered_lft = prefered_lft; 2733 ifp->tstamp = now; 2734 flags = ifp->flags; 2735 ifp->flags &= ~IFA_F_DEPRECATED; 2736 spin_unlock_bh(&ifp->lock); 2737 2738 if (!(flags&IFA_F_TENTATIVE)) 2739 ipv6_ifa_notify(0, ifp); 2740 } else 2741 spin_unlock_bh(&ifp->lock); 2742 2743 manage_tempaddrs(in6_dev, ifp, valid_lft, prefered_lft, 2744 create, now); 2745 2746 in6_ifa_put(ifp); 2747 addrconf_verify(net); 2748 } 2749 2750 return 0; 2751 } 2752 EXPORT_SYMBOL_GPL(addrconf_prefix_rcv_add_addr); 2753 2754 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao) 2755 { 2756 struct prefix_info *pinfo; 2757 struct fib6_table *table; 2758 __u32 valid_lft; 2759 __u32 prefered_lft; 2760 int addr_type, err; 2761 u32 addr_flags = 0; 2762 struct inet6_dev *in6_dev; 2763 struct net *net = dev_net(dev); 2764 2765 pinfo = (struct prefix_info *) opt; 2766 2767 if (len < sizeof(struct prefix_info)) { 2768 netdev_dbg(dev, "addrconf: prefix option too short\n"); 2769 return; 2770 } 2771 2772 /* 2773 * Validation checks ([ADDRCONF], page 19) 2774 */ 2775 2776 addr_type = ipv6_addr_type(&pinfo->prefix); 2777 2778 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL)) 2779 return; 2780 2781 valid_lft = ntohl(pinfo->valid); 2782 prefered_lft = ntohl(pinfo->prefered); 2783 2784 if (prefered_lft > valid_lft) { 2785 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n"); 2786 return; 2787 } 2788 2789 in6_dev = in6_dev_get(dev); 2790 2791 if (!in6_dev) { 2792 net_dbg_ratelimited("addrconf: device %s not configured\n", 2793 dev->name); 2794 return; 2795 } 2796 2797 if (valid_lft != 0 && valid_lft < in6_dev->cnf.accept_ra_min_lft) 2798 goto put; 2799 2800 /* 2801 * Two things going on here: 2802 * 1) Add routes for on-link prefixes 2803 * 2) Configure prefixes with the auto flag set 2804 */ 2805 2806 if (pinfo->onlink) { 2807 struct fib6_info *rt; 2808 unsigned long rt_expires; 2809 2810 /* Avoid arithmetic overflow. Really, we could 2811 * save rt_expires in seconds, likely valid_lft, 2812 * but it would require division in fib gc, that it 2813 * not good. 2814 */ 2815 if (HZ > USER_HZ) 2816 rt_expires = addrconf_timeout_fixup(valid_lft, HZ); 2817 else 2818 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ); 2819 2820 if (addrconf_finite_timeout(rt_expires)) 2821 rt_expires *= HZ; 2822 2823 rt = addrconf_get_prefix_route(&pinfo->prefix, 2824 pinfo->prefix_len, 2825 dev, 2826 RTF_ADDRCONF | RTF_PREFIX_RT, 2827 RTF_DEFAULT, true); 2828 2829 if (rt) { 2830 /* Autoconf prefix route */ 2831 if (valid_lft == 0) { 2832 ip6_del_rt(net, rt, false); 2833 rt = NULL; 2834 } else { 2835 table = rt->fib6_table; 2836 spin_lock_bh(&table->tb6_lock); 2837 2838 if (addrconf_finite_timeout(rt_expires)) { 2839 /* not infinity */ 2840 fib6_set_expires(rt, jiffies + rt_expires); 2841 fib6_add_gc_list(rt); 2842 } else { 2843 fib6_clean_expires(rt); 2844 fib6_remove_gc_list(rt); 2845 } 2846 2847 spin_unlock_bh(&table->tb6_lock); 2848 } 2849 } else if (valid_lft) { 2850 clock_t expires = 0; 2851 int flags = RTF_ADDRCONF | RTF_PREFIX_RT; 2852 if (addrconf_finite_timeout(rt_expires)) { 2853 /* not infinity */ 2854 flags |= RTF_EXPIRES; 2855 expires = jiffies_to_clock_t(rt_expires); 2856 } 2857 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len, 2858 0, dev, expires, flags, 2859 GFP_ATOMIC); 2860 } 2861 fib6_info_release(rt); 2862 } 2863 2864 /* Try to figure out our local address for this prefix */ 2865 2866 if (pinfo->autoconf && in6_dev->cnf.autoconf) { 2867 struct in6_addr addr; 2868 bool tokenized = false, dev_addr_generated = false; 2869 2870 if (pinfo->prefix_len == 64) { 2871 memcpy(&addr, &pinfo->prefix, 8); 2872 2873 if (!ipv6_addr_any(&in6_dev->token)) { 2874 read_lock_bh(&in6_dev->lock); 2875 memcpy(addr.s6_addr + 8, 2876 in6_dev->token.s6_addr + 8, 8); 2877 read_unlock_bh(&in6_dev->lock); 2878 tokenized = true; 2879 } else if (is_addr_mode_generate_stable(in6_dev) && 2880 !ipv6_generate_stable_address(&addr, 0, 2881 in6_dev)) { 2882 addr_flags |= IFA_F_STABLE_PRIVACY; 2883 goto ok; 2884 } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) && 2885 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) { 2886 goto put; 2887 } else { 2888 dev_addr_generated = true; 2889 } 2890 goto ok; 2891 } 2892 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n", 2893 pinfo->prefix_len); 2894 goto put; 2895 2896 ok: 2897 err = addrconf_prefix_rcv_add_addr(net, dev, pinfo, in6_dev, 2898 &addr, addr_type, 2899 addr_flags, sllao, 2900 tokenized, valid_lft, 2901 prefered_lft); 2902 if (err) 2903 goto put; 2904 2905 /* Ignore error case here because previous prefix add addr was 2906 * successful which will be notified. 2907 */ 2908 ndisc_ops_prefix_rcv_add_addr(net, dev, pinfo, in6_dev, &addr, 2909 addr_type, addr_flags, sllao, 2910 tokenized, valid_lft, 2911 prefered_lft, 2912 dev_addr_generated); 2913 } 2914 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo); 2915 put: 2916 in6_dev_put(in6_dev); 2917 } 2918 2919 static int addrconf_set_sit_dstaddr(struct net *net, struct net_device *dev, 2920 struct in6_ifreq *ireq) 2921 { 2922 struct ip_tunnel_parm p = { }; 2923 int err; 2924 2925 if (!(ipv6_addr_type(&ireq->ifr6_addr) & IPV6_ADDR_COMPATv4)) 2926 return -EADDRNOTAVAIL; 2927 2928 p.iph.daddr = ireq->ifr6_addr.s6_addr32[3]; 2929 p.iph.version = 4; 2930 p.iph.ihl = 5; 2931 p.iph.protocol = IPPROTO_IPV6; 2932 p.iph.ttl = 64; 2933 2934 if (!dev->netdev_ops->ndo_tunnel_ctl) 2935 return -EOPNOTSUPP; 2936 err = dev->netdev_ops->ndo_tunnel_ctl(dev, &p, SIOCADDTUNNEL); 2937 if (err) 2938 return err; 2939 2940 dev = __dev_get_by_name(net, p.name); 2941 if (!dev) 2942 return -ENOBUFS; 2943 return dev_open(dev, NULL); 2944 } 2945 2946 /* 2947 * Set destination address. 2948 * Special case for SIT interfaces where we create a new "virtual" 2949 * device. 2950 */ 2951 int addrconf_set_dstaddr(struct net *net, void __user *arg) 2952 { 2953 struct net_device *dev; 2954 struct in6_ifreq ireq; 2955 int err = -ENODEV; 2956 2957 if (!IS_ENABLED(CONFIG_IPV6_SIT)) 2958 return -ENODEV; 2959 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2960 return -EFAULT; 2961 2962 rtnl_lock(); 2963 dev = __dev_get_by_index(net, ireq.ifr6_ifindex); 2964 if (dev && dev->type == ARPHRD_SIT) 2965 err = addrconf_set_sit_dstaddr(net, dev, &ireq); 2966 rtnl_unlock(); 2967 return err; 2968 } 2969 2970 static int ipv6_mc_config(struct sock *sk, bool join, 2971 const struct in6_addr *addr, int ifindex) 2972 { 2973 int ret; 2974 2975 ASSERT_RTNL(); 2976 2977 lock_sock(sk); 2978 if (join) 2979 ret = ipv6_sock_mc_join(sk, ifindex, addr); 2980 else 2981 ret = ipv6_sock_mc_drop(sk, ifindex, addr); 2982 release_sock(sk); 2983 2984 return ret; 2985 } 2986 2987 /* 2988 * Manual configuration of address on an interface 2989 */ 2990 static int inet6_addr_add(struct net *net, int ifindex, 2991 struct ifa6_config *cfg, 2992 struct netlink_ext_ack *extack) 2993 { 2994 struct inet6_ifaddr *ifp; 2995 struct inet6_dev *idev; 2996 struct net_device *dev; 2997 unsigned long timeout; 2998 clock_t expires; 2999 u32 flags; 3000 3001 ASSERT_RTNL(); 3002 3003 if (cfg->plen > 128) { 3004 NL_SET_ERR_MSG_MOD(extack, "Invalid prefix length"); 3005 return -EINVAL; 3006 } 3007 3008 /* check the lifetime */ 3009 if (!cfg->valid_lft || cfg->preferred_lft > cfg->valid_lft) { 3010 NL_SET_ERR_MSG_MOD(extack, "address lifetime invalid"); 3011 return -EINVAL; 3012 } 3013 3014 if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR && cfg->plen != 64) { 3015 NL_SET_ERR_MSG_MOD(extack, "address with \"mngtmpaddr\" flag must have a prefix length of 64"); 3016 return -EINVAL; 3017 } 3018 3019 dev = __dev_get_by_index(net, ifindex); 3020 if (!dev) 3021 return -ENODEV; 3022 3023 idev = addrconf_add_dev(dev); 3024 if (IS_ERR(idev)) { 3025 NL_SET_ERR_MSG_MOD(extack, "IPv6 is disabled on this device"); 3026 return PTR_ERR(idev); 3027 } 3028 3029 if (cfg->ifa_flags & IFA_F_MCAUTOJOIN) { 3030 int ret = ipv6_mc_config(net->ipv6.mc_autojoin_sk, 3031 true, cfg->pfx, ifindex); 3032 3033 if (ret < 0) { 3034 NL_SET_ERR_MSG_MOD(extack, "Multicast auto join failed"); 3035 return ret; 3036 } 3037 } 3038 3039 cfg->scope = ipv6_addr_scope(cfg->pfx); 3040 3041 timeout = addrconf_timeout_fixup(cfg->valid_lft, HZ); 3042 if (addrconf_finite_timeout(timeout)) { 3043 expires = jiffies_to_clock_t(timeout * HZ); 3044 cfg->valid_lft = timeout; 3045 flags = RTF_EXPIRES; 3046 } else { 3047 expires = 0; 3048 flags = 0; 3049 cfg->ifa_flags |= IFA_F_PERMANENT; 3050 } 3051 3052 timeout = addrconf_timeout_fixup(cfg->preferred_lft, HZ); 3053 if (addrconf_finite_timeout(timeout)) { 3054 if (timeout == 0) 3055 cfg->ifa_flags |= IFA_F_DEPRECATED; 3056 cfg->preferred_lft = timeout; 3057 } 3058 3059 ifp = ipv6_add_addr(idev, cfg, true, extack); 3060 if (!IS_ERR(ifp)) { 3061 if (!(cfg->ifa_flags & IFA_F_NOPREFIXROUTE)) { 3062 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, 3063 ifp->rt_priority, dev, expires, 3064 flags, GFP_KERNEL); 3065 } 3066 3067 /* Send a netlink notification if DAD is enabled and 3068 * optimistic flag is not set 3069 */ 3070 if (!(ifp->flags & (IFA_F_OPTIMISTIC | IFA_F_NODAD))) 3071 ipv6_ifa_notify(0, ifp); 3072 /* 3073 * Note that section 3.1 of RFC 4429 indicates 3074 * that the Optimistic flag should not be set for 3075 * manually configured addresses 3076 */ 3077 addrconf_dad_start(ifp); 3078 if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR) 3079 manage_tempaddrs(idev, ifp, cfg->valid_lft, 3080 cfg->preferred_lft, true, jiffies); 3081 in6_ifa_put(ifp); 3082 addrconf_verify_rtnl(net); 3083 return 0; 3084 } else if (cfg->ifa_flags & IFA_F_MCAUTOJOIN) { 3085 ipv6_mc_config(net->ipv6.mc_autojoin_sk, false, 3086 cfg->pfx, ifindex); 3087 } 3088 3089 return PTR_ERR(ifp); 3090 } 3091 3092 static int inet6_addr_del(struct net *net, int ifindex, u32 ifa_flags, 3093 const struct in6_addr *pfx, unsigned int plen, 3094 struct netlink_ext_ack *extack) 3095 { 3096 struct inet6_ifaddr *ifp; 3097 struct inet6_dev *idev; 3098 struct net_device *dev; 3099 3100 if (plen > 128) { 3101 NL_SET_ERR_MSG_MOD(extack, "Invalid prefix length"); 3102 return -EINVAL; 3103 } 3104 3105 dev = __dev_get_by_index(net, ifindex); 3106 if (!dev) { 3107 NL_SET_ERR_MSG_MOD(extack, "Unable to find the interface"); 3108 return -ENODEV; 3109 } 3110 3111 idev = __in6_dev_get(dev); 3112 if (!idev) { 3113 NL_SET_ERR_MSG_MOD(extack, "IPv6 is disabled on this device"); 3114 return -ENXIO; 3115 } 3116 3117 read_lock_bh(&idev->lock); 3118 list_for_each_entry(ifp, &idev->addr_list, if_list) { 3119 if (ifp->prefix_len == plen && 3120 ipv6_addr_equal(pfx, &ifp->addr)) { 3121 in6_ifa_hold(ifp); 3122 read_unlock_bh(&idev->lock); 3123 3124 if (!(ifp->flags & IFA_F_TEMPORARY) && 3125 (ifa_flags & IFA_F_MANAGETEMPADDR)) 3126 manage_tempaddrs(idev, ifp, 0, 0, false, 3127 jiffies); 3128 ipv6_del_addr(ifp); 3129 addrconf_verify_rtnl(net); 3130 if (ipv6_addr_is_multicast(pfx)) { 3131 ipv6_mc_config(net->ipv6.mc_autojoin_sk, 3132 false, pfx, dev->ifindex); 3133 } 3134 return 0; 3135 } 3136 } 3137 read_unlock_bh(&idev->lock); 3138 3139 NL_SET_ERR_MSG_MOD(extack, "address not found"); 3140 return -EADDRNOTAVAIL; 3141 } 3142 3143 3144 int addrconf_add_ifaddr(struct net *net, void __user *arg) 3145 { 3146 struct ifa6_config cfg = { 3147 .ifa_flags = IFA_F_PERMANENT, 3148 .preferred_lft = INFINITY_LIFE_TIME, 3149 .valid_lft = INFINITY_LIFE_TIME, 3150 }; 3151 struct in6_ifreq ireq; 3152 int err; 3153 3154 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 3155 return -EPERM; 3156 3157 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 3158 return -EFAULT; 3159 3160 cfg.pfx = &ireq.ifr6_addr; 3161 cfg.plen = ireq.ifr6_prefixlen; 3162 3163 rtnl_lock(); 3164 err = inet6_addr_add(net, ireq.ifr6_ifindex, &cfg, NULL); 3165 rtnl_unlock(); 3166 return err; 3167 } 3168 3169 int addrconf_del_ifaddr(struct net *net, void __user *arg) 3170 { 3171 struct in6_ifreq ireq; 3172 int err; 3173 3174 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 3175 return -EPERM; 3176 3177 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 3178 return -EFAULT; 3179 3180 rtnl_lock(); 3181 err = inet6_addr_del(net, ireq.ifr6_ifindex, 0, &ireq.ifr6_addr, 3182 ireq.ifr6_prefixlen, NULL); 3183 rtnl_unlock(); 3184 return err; 3185 } 3186 3187 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr, 3188 int plen, int scope, u8 proto) 3189 { 3190 struct inet6_ifaddr *ifp; 3191 struct ifa6_config cfg = { 3192 .pfx = addr, 3193 .plen = plen, 3194 .ifa_flags = IFA_F_PERMANENT, 3195 .valid_lft = INFINITY_LIFE_TIME, 3196 .preferred_lft = INFINITY_LIFE_TIME, 3197 .scope = scope, 3198 .ifa_proto = proto 3199 }; 3200 3201 ifp = ipv6_add_addr(idev, &cfg, true, NULL); 3202 if (!IS_ERR(ifp)) { 3203 spin_lock_bh(&ifp->lock); 3204 ifp->flags &= ~IFA_F_TENTATIVE; 3205 spin_unlock_bh(&ifp->lock); 3206 rt_genid_bump_ipv6(dev_net(idev->dev)); 3207 ipv6_ifa_notify(RTM_NEWADDR, ifp); 3208 in6_ifa_put(ifp); 3209 } 3210 } 3211 3212 #if IS_ENABLED(CONFIG_IPV6_SIT) || IS_ENABLED(CONFIG_NET_IPGRE) || IS_ENABLED(CONFIG_IPV6_GRE) 3213 static void add_v4_addrs(struct inet6_dev *idev) 3214 { 3215 struct in6_addr addr; 3216 struct net_device *dev; 3217 struct net *net = dev_net(idev->dev); 3218 int scope, plen, offset = 0; 3219 u32 pflags = 0; 3220 3221 ASSERT_RTNL(); 3222 3223 memset(&addr, 0, sizeof(struct in6_addr)); 3224 /* in case of IP6GRE the dev_addr is an IPv6 and therefore we use only the last 4 bytes */ 3225 if (idev->dev->addr_len == sizeof(struct in6_addr)) 3226 offset = sizeof(struct in6_addr) - 4; 3227 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr + offset, 4); 3228 3229 if (!(idev->dev->flags & IFF_POINTOPOINT) && idev->dev->type == ARPHRD_SIT) { 3230 scope = IPV6_ADDR_COMPATv4; 3231 plen = 96; 3232 pflags |= RTF_NONEXTHOP; 3233 } else { 3234 if (idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_NONE) 3235 return; 3236 3237 addr.s6_addr32[0] = htonl(0xfe800000); 3238 scope = IFA_LINK; 3239 plen = 64; 3240 } 3241 3242 if (addr.s6_addr32[3]) { 3243 add_addr(idev, &addr, plen, scope, IFAPROT_UNSPEC); 3244 addrconf_prefix_route(&addr, plen, 0, idev->dev, 0, pflags, 3245 GFP_KERNEL); 3246 return; 3247 } 3248 3249 for_each_netdev(net, dev) { 3250 struct in_device *in_dev = __in_dev_get_rtnl(dev); 3251 if (in_dev && (dev->flags & IFF_UP)) { 3252 struct in_ifaddr *ifa; 3253 int flag = scope; 3254 3255 in_dev_for_each_ifa_rtnl(ifa, in_dev) { 3256 addr.s6_addr32[3] = ifa->ifa_local; 3257 3258 if (ifa->ifa_scope == RT_SCOPE_LINK) 3259 continue; 3260 if (ifa->ifa_scope >= RT_SCOPE_HOST) { 3261 if (idev->dev->flags&IFF_POINTOPOINT) 3262 continue; 3263 flag |= IFA_HOST; 3264 } 3265 3266 add_addr(idev, &addr, plen, flag, 3267 IFAPROT_UNSPEC); 3268 addrconf_prefix_route(&addr, plen, 0, idev->dev, 3269 0, pflags, GFP_KERNEL); 3270 } 3271 } 3272 } 3273 } 3274 #endif 3275 3276 static void init_loopback(struct net_device *dev) 3277 { 3278 struct inet6_dev *idev; 3279 3280 /* ::1 */ 3281 3282 ASSERT_RTNL(); 3283 3284 idev = ipv6_find_idev(dev); 3285 if (IS_ERR(idev)) { 3286 pr_debug("%s: add_dev failed\n", __func__); 3287 return; 3288 } 3289 3290 add_addr(idev, &in6addr_loopback, 128, IFA_HOST, IFAPROT_KERNEL_LO); 3291 } 3292 3293 void addrconf_add_linklocal(struct inet6_dev *idev, 3294 const struct in6_addr *addr, u32 flags) 3295 { 3296 struct ifa6_config cfg = { 3297 .pfx = addr, 3298 .plen = 64, 3299 .ifa_flags = flags | IFA_F_PERMANENT, 3300 .valid_lft = INFINITY_LIFE_TIME, 3301 .preferred_lft = INFINITY_LIFE_TIME, 3302 .scope = IFA_LINK, 3303 .ifa_proto = IFAPROT_KERNEL_LL 3304 }; 3305 struct inet6_ifaddr *ifp; 3306 3307 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 3308 if ((READ_ONCE(dev_net(idev->dev)->ipv6.devconf_all->optimistic_dad) || 3309 READ_ONCE(idev->cnf.optimistic_dad)) && 3310 !dev_net(idev->dev)->ipv6.devconf_all->forwarding) 3311 cfg.ifa_flags |= IFA_F_OPTIMISTIC; 3312 #endif 3313 3314 ifp = ipv6_add_addr(idev, &cfg, true, NULL); 3315 if (!IS_ERR(ifp)) { 3316 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, 0, idev->dev, 3317 0, 0, GFP_ATOMIC); 3318 addrconf_dad_start(ifp); 3319 in6_ifa_put(ifp); 3320 } 3321 } 3322 EXPORT_SYMBOL_GPL(addrconf_add_linklocal); 3323 3324 static bool ipv6_reserved_interfaceid(struct in6_addr address) 3325 { 3326 if ((address.s6_addr32[2] | address.s6_addr32[3]) == 0) 3327 return true; 3328 3329 if (address.s6_addr32[2] == htonl(0x02005eff) && 3330 ((address.s6_addr32[3] & htonl(0xfe000000)) == htonl(0xfe000000))) 3331 return true; 3332 3333 if (address.s6_addr32[2] == htonl(0xfdffffff) && 3334 ((address.s6_addr32[3] & htonl(0xffffff80)) == htonl(0xffffff80))) 3335 return true; 3336 3337 return false; 3338 } 3339 3340 static int ipv6_generate_stable_address(struct in6_addr *address, 3341 u8 dad_count, 3342 const struct inet6_dev *idev) 3343 { 3344 static DEFINE_SPINLOCK(lock); 3345 static __u32 digest[SHA1_DIGEST_WORDS]; 3346 static __u32 workspace[SHA1_WORKSPACE_WORDS]; 3347 3348 static union { 3349 char __data[SHA1_BLOCK_SIZE]; 3350 struct { 3351 struct in6_addr secret; 3352 __be32 prefix[2]; 3353 unsigned char hwaddr[MAX_ADDR_LEN]; 3354 u8 dad_count; 3355 } __packed; 3356 } data; 3357 3358 struct in6_addr secret; 3359 struct in6_addr temp; 3360 struct net *net = dev_net(idev->dev); 3361 3362 BUILD_BUG_ON(sizeof(data.__data) != sizeof(data)); 3363 3364 if (idev->cnf.stable_secret.initialized) 3365 secret = idev->cnf.stable_secret.secret; 3366 else if (net->ipv6.devconf_dflt->stable_secret.initialized) 3367 secret = net->ipv6.devconf_dflt->stable_secret.secret; 3368 else 3369 return -1; 3370 3371 retry: 3372 spin_lock_bh(&lock); 3373 3374 sha1_init(digest); 3375 memset(&data, 0, sizeof(data)); 3376 memset(workspace, 0, sizeof(workspace)); 3377 memcpy(data.hwaddr, idev->dev->perm_addr, idev->dev->addr_len); 3378 data.prefix[0] = address->s6_addr32[0]; 3379 data.prefix[1] = address->s6_addr32[1]; 3380 data.secret = secret; 3381 data.dad_count = dad_count; 3382 3383 sha1_transform(digest, data.__data, workspace); 3384 3385 temp = *address; 3386 temp.s6_addr32[2] = (__force __be32)digest[0]; 3387 temp.s6_addr32[3] = (__force __be32)digest[1]; 3388 3389 spin_unlock_bh(&lock); 3390 3391 if (ipv6_reserved_interfaceid(temp)) { 3392 dad_count++; 3393 if (dad_count > dev_net(idev->dev)->ipv6.sysctl.idgen_retries) 3394 return -1; 3395 goto retry; 3396 } 3397 3398 *address = temp; 3399 return 0; 3400 } 3401 3402 static void ipv6_gen_mode_random_init(struct inet6_dev *idev) 3403 { 3404 struct ipv6_stable_secret *s = &idev->cnf.stable_secret; 3405 3406 if (s->initialized) 3407 return; 3408 s = &idev->cnf.stable_secret; 3409 get_random_bytes(&s->secret, sizeof(s->secret)); 3410 s->initialized = true; 3411 } 3412 3413 static void addrconf_addr_gen(struct inet6_dev *idev, bool prefix_route) 3414 { 3415 struct in6_addr addr; 3416 3417 /* no link local addresses on L3 master devices */ 3418 if (netif_is_l3_master(idev->dev)) 3419 return; 3420 3421 /* no link local addresses on devices flagged as slaves */ 3422 if (idev->dev->priv_flags & IFF_NO_ADDRCONF) 3423 return; 3424 3425 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0); 3426 3427 switch (idev->cnf.addr_gen_mode) { 3428 case IN6_ADDR_GEN_MODE_RANDOM: 3429 ipv6_gen_mode_random_init(idev); 3430 fallthrough; 3431 case IN6_ADDR_GEN_MODE_STABLE_PRIVACY: 3432 if (!ipv6_generate_stable_address(&addr, 0, idev)) 3433 addrconf_add_linklocal(idev, &addr, 3434 IFA_F_STABLE_PRIVACY); 3435 else if (prefix_route) 3436 addrconf_prefix_route(&addr, 64, 0, idev->dev, 3437 0, 0, GFP_KERNEL); 3438 break; 3439 case IN6_ADDR_GEN_MODE_EUI64: 3440 /* addrconf_add_linklocal also adds a prefix_route and we 3441 * only need to care about prefix routes if ipv6_generate_eui64 3442 * couldn't generate one. 3443 */ 3444 if (ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) == 0) 3445 addrconf_add_linklocal(idev, &addr, 0); 3446 else if (prefix_route) 3447 addrconf_prefix_route(&addr, 64, 0, idev->dev, 3448 0, 0, GFP_KERNEL); 3449 break; 3450 case IN6_ADDR_GEN_MODE_NONE: 3451 default: 3452 /* will not add any link local address */ 3453 break; 3454 } 3455 } 3456 3457 static void addrconf_dev_config(struct net_device *dev) 3458 { 3459 struct inet6_dev *idev; 3460 3461 ASSERT_RTNL(); 3462 3463 if ((dev->type != ARPHRD_ETHER) && 3464 (dev->type != ARPHRD_FDDI) && 3465 (dev->type != ARPHRD_ARCNET) && 3466 (dev->type != ARPHRD_INFINIBAND) && 3467 (dev->type != ARPHRD_IEEE1394) && 3468 (dev->type != ARPHRD_TUNNEL6) && 3469 (dev->type != ARPHRD_6LOWPAN) && 3470 (dev->type != ARPHRD_TUNNEL) && 3471 (dev->type != ARPHRD_NONE) && 3472 (dev->type != ARPHRD_RAWIP)) { 3473 /* Alas, we support only Ethernet autoconfiguration. */ 3474 idev = __in6_dev_get(dev); 3475 if (!IS_ERR_OR_NULL(idev) && dev->flags & IFF_UP && 3476 dev->flags & IFF_MULTICAST) 3477 ipv6_mc_up(idev); 3478 return; 3479 } 3480 3481 idev = addrconf_add_dev(dev); 3482 if (IS_ERR(idev)) 3483 return; 3484 3485 /* this device type has no EUI support */ 3486 if (dev->type == ARPHRD_NONE && 3487 idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_EUI64) 3488 WRITE_ONCE(idev->cnf.addr_gen_mode, 3489 IN6_ADDR_GEN_MODE_RANDOM); 3490 3491 addrconf_addr_gen(idev, false); 3492 } 3493 3494 #if IS_ENABLED(CONFIG_IPV6_SIT) 3495 static void addrconf_sit_config(struct net_device *dev) 3496 { 3497 struct inet6_dev *idev; 3498 3499 ASSERT_RTNL(); 3500 3501 /* 3502 * Configure the tunnel with one of our IPv4 3503 * addresses... we should configure all of 3504 * our v4 addrs in the tunnel 3505 */ 3506 3507 idev = ipv6_find_idev(dev); 3508 if (IS_ERR(idev)) { 3509 pr_debug("%s: add_dev failed\n", __func__); 3510 return; 3511 } 3512 3513 if (dev->priv_flags & IFF_ISATAP) { 3514 addrconf_addr_gen(idev, false); 3515 return; 3516 } 3517 3518 add_v4_addrs(idev); 3519 3520 if (dev->flags&IFF_POINTOPOINT) 3521 addrconf_add_mroute(dev); 3522 } 3523 #endif 3524 3525 #if IS_ENABLED(CONFIG_NET_IPGRE) || IS_ENABLED(CONFIG_IPV6_GRE) 3526 static void addrconf_gre_config(struct net_device *dev) 3527 { 3528 struct inet6_dev *idev; 3529 3530 ASSERT_RTNL(); 3531 3532 idev = ipv6_find_idev(dev); 3533 if (IS_ERR(idev)) { 3534 pr_debug("%s: add_dev failed\n", __func__); 3535 return; 3536 } 3537 3538 if (dev->type == ARPHRD_ETHER) { 3539 addrconf_addr_gen(idev, true); 3540 return; 3541 } 3542 3543 add_v4_addrs(idev); 3544 3545 if (dev->flags & IFF_POINTOPOINT) 3546 addrconf_add_mroute(dev); 3547 } 3548 #endif 3549 3550 static void addrconf_init_auto_addrs(struct net_device *dev) 3551 { 3552 switch (dev->type) { 3553 #if IS_ENABLED(CONFIG_IPV6_SIT) 3554 case ARPHRD_SIT: 3555 addrconf_sit_config(dev); 3556 break; 3557 #endif 3558 #if IS_ENABLED(CONFIG_NET_IPGRE) || IS_ENABLED(CONFIG_IPV6_GRE) 3559 case ARPHRD_IP6GRE: 3560 case ARPHRD_IPGRE: 3561 addrconf_gre_config(dev); 3562 break; 3563 #endif 3564 case ARPHRD_LOOPBACK: 3565 init_loopback(dev); 3566 break; 3567 3568 default: 3569 addrconf_dev_config(dev); 3570 break; 3571 } 3572 } 3573 3574 static int fixup_permanent_addr(struct net *net, 3575 struct inet6_dev *idev, 3576 struct inet6_ifaddr *ifp) 3577 { 3578 /* !fib6_node means the host route was removed from the 3579 * FIB, for example, if 'lo' device is taken down. In that 3580 * case regenerate the host route. 3581 */ 3582 if (!ifp->rt || !ifp->rt->fib6_node) { 3583 struct fib6_info *f6i, *prev; 3584 3585 f6i = addrconf_f6i_alloc(net, idev, &ifp->addr, false, 3586 GFP_ATOMIC, NULL); 3587 if (IS_ERR(f6i)) 3588 return PTR_ERR(f6i); 3589 3590 /* ifp->rt can be accessed outside of rtnl */ 3591 spin_lock(&ifp->lock); 3592 prev = ifp->rt; 3593 ifp->rt = f6i; 3594 spin_unlock(&ifp->lock); 3595 3596 fib6_info_release(prev); 3597 } 3598 3599 if (!(ifp->flags & IFA_F_NOPREFIXROUTE)) { 3600 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, 3601 ifp->rt_priority, idev->dev, 0, 0, 3602 GFP_ATOMIC); 3603 } 3604 3605 if (ifp->state == INET6_IFADDR_STATE_PREDAD) 3606 addrconf_dad_start(ifp); 3607 3608 return 0; 3609 } 3610 3611 static void addrconf_permanent_addr(struct net *net, struct net_device *dev) 3612 { 3613 struct inet6_ifaddr *ifp, *tmp; 3614 struct inet6_dev *idev; 3615 3616 idev = __in6_dev_get(dev); 3617 if (!idev) 3618 return; 3619 3620 write_lock_bh(&idev->lock); 3621 3622 list_for_each_entry_safe(ifp, tmp, &idev->addr_list, if_list) { 3623 if ((ifp->flags & IFA_F_PERMANENT) && 3624 fixup_permanent_addr(net, idev, ifp) < 0) { 3625 write_unlock_bh(&idev->lock); 3626 in6_ifa_hold(ifp); 3627 ipv6_del_addr(ifp); 3628 write_lock_bh(&idev->lock); 3629 3630 net_info_ratelimited("%s: Failed to add prefix route for address %pI6c; dropping\n", 3631 idev->dev->name, &ifp->addr); 3632 } 3633 } 3634 3635 write_unlock_bh(&idev->lock); 3636 } 3637 3638 static int addrconf_notify(struct notifier_block *this, unsigned long event, 3639 void *ptr) 3640 { 3641 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 3642 struct netdev_notifier_change_info *change_info; 3643 struct netdev_notifier_changeupper_info *info; 3644 struct inet6_dev *idev = __in6_dev_get(dev); 3645 struct net *net = dev_net(dev); 3646 int run_pending = 0; 3647 int err; 3648 3649 switch (event) { 3650 case NETDEV_REGISTER: 3651 if (!idev && dev->mtu >= IPV6_MIN_MTU) { 3652 idev = ipv6_add_dev(dev); 3653 if (IS_ERR(idev)) 3654 return notifier_from_errno(PTR_ERR(idev)); 3655 } 3656 break; 3657 3658 case NETDEV_CHANGEMTU: 3659 /* if MTU under IPV6_MIN_MTU stop IPv6 on this interface. */ 3660 if (dev->mtu < IPV6_MIN_MTU) { 3661 addrconf_ifdown(dev, dev != net->loopback_dev); 3662 break; 3663 } 3664 3665 if (idev) { 3666 rt6_mtu_change(dev, dev->mtu); 3667 WRITE_ONCE(idev->cnf.mtu6, dev->mtu); 3668 break; 3669 } 3670 3671 /* allocate new idev */ 3672 idev = ipv6_add_dev(dev); 3673 if (IS_ERR(idev)) 3674 break; 3675 3676 /* device is still not ready */ 3677 if (!(idev->if_flags & IF_READY)) 3678 break; 3679 3680 run_pending = 1; 3681 fallthrough; 3682 case NETDEV_UP: 3683 case NETDEV_CHANGE: 3684 if (idev && idev->cnf.disable_ipv6) 3685 break; 3686 3687 if (dev->priv_flags & IFF_NO_ADDRCONF) { 3688 if (event == NETDEV_UP && !IS_ERR_OR_NULL(idev) && 3689 dev->flags & IFF_UP && dev->flags & IFF_MULTICAST) 3690 ipv6_mc_up(idev); 3691 break; 3692 } 3693 3694 if (event == NETDEV_UP) { 3695 /* restore routes for permanent addresses */ 3696 addrconf_permanent_addr(net, dev); 3697 3698 if (!addrconf_link_ready(dev)) { 3699 /* device is not ready yet. */ 3700 pr_debug("ADDRCONF(NETDEV_UP): %s: link is not ready\n", 3701 dev->name); 3702 break; 3703 } 3704 3705 if (!idev && dev->mtu >= IPV6_MIN_MTU) 3706 idev = ipv6_add_dev(dev); 3707 3708 if (!IS_ERR_OR_NULL(idev)) { 3709 idev->if_flags |= IF_READY; 3710 run_pending = 1; 3711 } 3712 } else if (event == NETDEV_CHANGE) { 3713 if (!addrconf_link_ready(dev)) { 3714 /* device is still not ready. */ 3715 rt6_sync_down_dev(dev, event); 3716 break; 3717 } 3718 3719 if (!IS_ERR_OR_NULL(idev)) { 3720 if (idev->if_flags & IF_READY) { 3721 /* device is already configured - 3722 * but resend MLD reports, we might 3723 * have roamed and need to update 3724 * multicast snooping switches 3725 */ 3726 ipv6_mc_up(idev); 3727 change_info = ptr; 3728 if (change_info->flags_changed & IFF_NOARP) 3729 addrconf_dad_run(idev, true); 3730 rt6_sync_up(dev, RTNH_F_LINKDOWN); 3731 break; 3732 } 3733 idev->if_flags |= IF_READY; 3734 } 3735 3736 pr_debug("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n", 3737 dev->name); 3738 3739 run_pending = 1; 3740 } 3741 3742 addrconf_init_auto_addrs(dev); 3743 3744 if (!IS_ERR_OR_NULL(idev)) { 3745 if (run_pending) 3746 addrconf_dad_run(idev, false); 3747 3748 /* Device has an address by now */ 3749 rt6_sync_up(dev, RTNH_F_DEAD); 3750 3751 /* 3752 * If the MTU changed during the interface down, 3753 * when the interface up, the changed MTU must be 3754 * reflected in the idev as well as routers. 3755 */ 3756 if (idev->cnf.mtu6 != dev->mtu && 3757 dev->mtu >= IPV6_MIN_MTU) { 3758 rt6_mtu_change(dev, dev->mtu); 3759 WRITE_ONCE(idev->cnf.mtu6, dev->mtu); 3760 } 3761 WRITE_ONCE(idev->tstamp, jiffies); 3762 inet6_ifinfo_notify(RTM_NEWLINK, idev); 3763 3764 /* 3765 * If the changed mtu during down is lower than 3766 * IPV6_MIN_MTU stop IPv6 on this interface. 3767 */ 3768 if (dev->mtu < IPV6_MIN_MTU) 3769 addrconf_ifdown(dev, dev != net->loopback_dev); 3770 } 3771 break; 3772 3773 case NETDEV_DOWN: 3774 case NETDEV_UNREGISTER: 3775 /* 3776 * Remove all addresses from this interface. 3777 */ 3778 addrconf_ifdown(dev, event != NETDEV_DOWN); 3779 break; 3780 3781 case NETDEV_CHANGENAME: 3782 if (idev) { 3783 snmp6_unregister_dev(idev); 3784 addrconf_sysctl_unregister(idev); 3785 err = addrconf_sysctl_register(idev); 3786 if (err) 3787 return notifier_from_errno(err); 3788 err = snmp6_register_dev(idev); 3789 if (err) { 3790 addrconf_sysctl_unregister(idev); 3791 return notifier_from_errno(err); 3792 } 3793 } 3794 break; 3795 3796 case NETDEV_PRE_TYPE_CHANGE: 3797 case NETDEV_POST_TYPE_CHANGE: 3798 if (idev) 3799 addrconf_type_change(dev, event); 3800 break; 3801 3802 case NETDEV_CHANGEUPPER: 3803 info = ptr; 3804 3805 /* flush all routes if dev is linked to or unlinked from 3806 * an L3 master device (e.g., VRF) 3807 */ 3808 if (info->upper_dev && netif_is_l3_master(info->upper_dev)) 3809 addrconf_ifdown(dev, false); 3810 } 3811 3812 return NOTIFY_OK; 3813 } 3814 3815 /* 3816 * addrconf module should be notified of a device going up 3817 */ 3818 static struct notifier_block ipv6_dev_notf = { 3819 .notifier_call = addrconf_notify, 3820 .priority = ADDRCONF_NOTIFY_PRIORITY, 3821 }; 3822 3823 static void addrconf_type_change(struct net_device *dev, unsigned long event) 3824 { 3825 struct inet6_dev *idev; 3826 ASSERT_RTNL(); 3827 3828 idev = __in6_dev_get(dev); 3829 3830 if (event == NETDEV_POST_TYPE_CHANGE) 3831 ipv6_mc_remap(idev); 3832 else if (event == NETDEV_PRE_TYPE_CHANGE) 3833 ipv6_mc_unmap(idev); 3834 } 3835 3836 static bool addr_is_local(const struct in6_addr *addr) 3837 { 3838 return ipv6_addr_type(addr) & 3839 (IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK); 3840 } 3841 3842 static int addrconf_ifdown(struct net_device *dev, bool unregister) 3843 { 3844 unsigned long event = unregister ? NETDEV_UNREGISTER : NETDEV_DOWN; 3845 struct net *net = dev_net(dev); 3846 struct inet6_dev *idev; 3847 struct inet6_ifaddr *ifa; 3848 LIST_HEAD(tmp_addr_list); 3849 bool keep_addr = false; 3850 bool was_ready; 3851 int state, i; 3852 3853 ASSERT_RTNL(); 3854 3855 rt6_disable_ip(dev, event); 3856 3857 idev = __in6_dev_get(dev); 3858 if (!idev) 3859 return -ENODEV; 3860 3861 /* 3862 * Step 1: remove reference to ipv6 device from parent device. 3863 * Do not dev_put! 3864 */ 3865 if (unregister) { 3866 idev->dead = 1; 3867 3868 /* protected by rtnl_lock */ 3869 RCU_INIT_POINTER(dev->ip6_ptr, NULL); 3870 3871 /* Step 1.5: remove snmp6 entry */ 3872 snmp6_unregister_dev(idev); 3873 3874 } 3875 3876 /* combine the user config with event to determine if permanent 3877 * addresses are to be removed from address hash table 3878 */ 3879 if (!unregister && !idev->cnf.disable_ipv6) { 3880 /* aggregate the system setting and interface setting */ 3881 int _keep_addr = READ_ONCE(net->ipv6.devconf_all->keep_addr_on_down); 3882 3883 if (!_keep_addr) 3884 _keep_addr = READ_ONCE(idev->cnf.keep_addr_on_down); 3885 3886 keep_addr = (_keep_addr > 0); 3887 } 3888 3889 /* Step 2: clear hash table */ 3890 for (i = 0; i < IN6_ADDR_HSIZE; i++) { 3891 struct hlist_head *h = &net->ipv6.inet6_addr_lst[i]; 3892 3893 spin_lock_bh(&net->ipv6.addrconf_hash_lock); 3894 restart: 3895 hlist_for_each_entry_rcu(ifa, h, addr_lst) { 3896 if (ifa->idev == idev) { 3897 addrconf_del_dad_work(ifa); 3898 /* combined flag + permanent flag decide if 3899 * address is retained on a down event 3900 */ 3901 if (!keep_addr || 3902 !(ifa->flags & IFA_F_PERMANENT) || 3903 addr_is_local(&ifa->addr)) { 3904 hlist_del_init_rcu(&ifa->addr_lst); 3905 goto restart; 3906 } 3907 } 3908 } 3909 spin_unlock_bh(&net->ipv6.addrconf_hash_lock); 3910 } 3911 3912 write_lock_bh(&idev->lock); 3913 3914 addrconf_del_rs_timer(idev); 3915 3916 /* Step 2: clear flags for stateless addrconf, repeated down 3917 * detection 3918 */ 3919 was_ready = idev->if_flags & IF_READY; 3920 if (!unregister) 3921 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY); 3922 3923 /* Step 3: clear tempaddr list */ 3924 while (!list_empty(&idev->tempaddr_list)) { 3925 ifa = list_first_entry(&idev->tempaddr_list, 3926 struct inet6_ifaddr, tmp_list); 3927 list_del(&ifa->tmp_list); 3928 write_unlock_bh(&idev->lock); 3929 spin_lock_bh(&ifa->lock); 3930 3931 if (ifa->ifpub) { 3932 in6_ifa_put(ifa->ifpub); 3933 ifa->ifpub = NULL; 3934 } 3935 spin_unlock_bh(&ifa->lock); 3936 in6_ifa_put(ifa); 3937 write_lock_bh(&idev->lock); 3938 } 3939 3940 list_for_each_entry(ifa, &idev->addr_list, if_list) 3941 list_add_tail(&ifa->if_list_aux, &tmp_addr_list); 3942 write_unlock_bh(&idev->lock); 3943 3944 while (!list_empty(&tmp_addr_list)) { 3945 struct fib6_info *rt = NULL; 3946 bool keep; 3947 3948 ifa = list_first_entry(&tmp_addr_list, 3949 struct inet6_ifaddr, if_list_aux); 3950 list_del(&ifa->if_list_aux); 3951 3952 addrconf_del_dad_work(ifa); 3953 3954 keep = keep_addr && (ifa->flags & IFA_F_PERMANENT) && 3955 !addr_is_local(&ifa->addr); 3956 3957 spin_lock_bh(&ifa->lock); 3958 3959 if (keep) { 3960 /* set state to skip the notifier below */ 3961 state = INET6_IFADDR_STATE_DEAD; 3962 ifa->state = INET6_IFADDR_STATE_PREDAD; 3963 if (!(ifa->flags & IFA_F_NODAD)) 3964 ifa->flags |= IFA_F_TENTATIVE; 3965 3966 rt = ifa->rt; 3967 ifa->rt = NULL; 3968 } else { 3969 state = ifa->state; 3970 ifa->state = INET6_IFADDR_STATE_DEAD; 3971 } 3972 3973 spin_unlock_bh(&ifa->lock); 3974 3975 if (rt) 3976 ip6_del_rt(net, rt, false); 3977 3978 if (state != INET6_IFADDR_STATE_DEAD) { 3979 __ipv6_ifa_notify(RTM_DELADDR, ifa); 3980 inet6addr_notifier_call_chain(NETDEV_DOWN, ifa); 3981 } else { 3982 if (idev->cnf.forwarding) 3983 addrconf_leave_anycast(ifa); 3984 addrconf_leave_solict(ifa->idev, &ifa->addr); 3985 } 3986 3987 if (!keep) { 3988 write_lock_bh(&idev->lock); 3989 list_del_rcu(&ifa->if_list); 3990 write_unlock_bh(&idev->lock); 3991 in6_ifa_put(ifa); 3992 } 3993 } 3994 3995 /* Step 5: Discard anycast and multicast list */ 3996 if (unregister) { 3997 ipv6_ac_destroy_dev(idev); 3998 ipv6_mc_destroy_dev(idev); 3999 } else if (was_ready) { 4000 ipv6_mc_down(idev); 4001 } 4002 4003 WRITE_ONCE(idev->tstamp, jiffies); 4004 idev->ra_mtu = 0; 4005 4006 /* Last: Shot the device (if unregistered) */ 4007 if (unregister) { 4008 addrconf_sysctl_unregister(idev); 4009 neigh_parms_release(&nd_tbl, idev->nd_parms); 4010 neigh_ifdown(&nd_tbl, dev); 4011 in6_dev_put(idev); 4012 } 4013 return 0; 4014 } 4015 4016 static void addrconf_rs_timer(struct timer_list *t) 4017 { 4018 struct inet6_dev *idev = from_timer(idev, t, rs_timer); 4019 struct net_device *dev = idev->dev; 4020 struct in6_addr lladdr; 4021 int rtr_solicits; 4022 4023 write_lock(&idev->lock); 4024 if (idev->dead || !(idev->if_flags & IF_READY)) 4025 goto out; 4026 4027 if (!ipv6_accept_ra(idev)) 4028 goto out; 4029 4030 /* Announcement received after solicitation was sent */ 4031 if (idev->if_flags & IF_RA_RCVD) 4032 goto out; 4033 4034 rtr_solicits = READ_ONCE(idev->cnf.rtr_solicits); 4035 4036 if (idev->rs_probes++ < rtr_solicits || rtr_solicits < 0) { 4037 write_unlock(&idev->lock); 4038 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE)) 4039 ndisc_send_rs(dev, &lladdr, 4040 &in6addr_linklocal_allrouters); 4041 else 4042 goto put; 4043 4044 write_lock(&idev->lock); 4045 idev->rs_interval = rfc3315_s14_backoff_update( 4046 idev->rs_interval, 4047 READ_ONCE(idev->cnf.rtr_solicit_max_interval)); 4048 /* The wait after the last probe can be shorter */ 4049 addrconf_mod_rs_timer(idev, (idev->rs_probes == 4050 READ_ONCE(idev->cnf.rtr_solicits)) ? 4051 READ_ONCE(idev->cnf.rtr_solicit_delay) : 4052 idev->rs_interval); 4053 } else { 4054 /* 4055 * Note: we do not support deprecated "all on-link" 4056 * assumption any longer. 4057 */ 4058 pr_debug("%s: no IPv6 routers present\n", idev->dev->name); 4059 } 4060 4061 out: 4062 write_unlock(&idev->lock); 4063 put: 4064 in6_dev_put(idev); 4065 } 4066 4067 /* 4068 * Duplicate Address Detection 4069 */ 4070 static void addrconf_dad_kick(struct inet6_ifaddr *ifp) 4071 { 4072 struct inet6_dev *idev = ifp->idev; 4073 unsigned long rand_num; 4074 u64 nonce; 4075 4076 if (ifp->flags & IFA_F_OPTIMISTIC) 4077 rand_num = 0; 4078 else 4079 rand_num = get_random_u32_below( 4080 READ_ONCE(idev->cnf.rtr_solicit_delay) ? : 1); 4081 4082 nonce = 0; 4083 if (READ_ONCE(idev->cnf.enhanced_dad) || 4084 READ_ONCE(dev_net(idev->dev)->ipv6.devconf_all->enhanced_dad)) { 4085 do 4086 get_random_bytes(&nonce, 6); 4087 while (nonce == 0); 4088 } 4089 ifp->dad_nonce = nonce; 4090 ifp->dad_probes = READ_ONCE(idev->cnf.dad_transmits); 4091 addrconf_mod_dad_work(ifp, rand_num); 4092 } 4093 4094 static void addrconf_dad_begin(struct inet6_ifaddr *ifp) 4095 { 4096 struct inet6_dev *idev = ifp->idev; 4097 struct net_device *dev = idev->dev; 4098 bool bump_id, notify = false; 4099 struct net *net; 4100 4101 addrconf_join_solict(dev, &ifp->addr); 4102 4103 read_lock_bh(&idev->lock); 4104 spin_lock(&ifp->lock); 4105 if (ifp->state == INET6_IFADDR_STATE_DEAD) 4106 goto out; 4107 4108 net = dev_net(dev); 4109 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) || 4110 (READ_ONCE(net->ipv6.devconf_all->accept_dad) < 1 && 4111 READ_ONCE(idev->cnf.accept_dad) < 1) || 4112 !(ifp->flags&IFA_F_TENTATIVE) || 4113 ifp->flags & IFA_F_NODAD) { 4114 bool send_na = false; 4115 4116 if (ifp->flags & IFA_F_TENTATIVE && 4117 !(ifp->flags & IFA_F_OPTIMISTIC)) 4118 send_na = true; 4119 bump_id = ifp->flags & IFA_F_TENTATIVE; 4120 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED); 4121 spin_unlock(&ifp->lock); 4122 read_unlock_bh(&idev->lock); 4123 4124 addrconf_dad_completed(ifp, bump_id, send_na); 4125 return; 4126 } 4127 4128 if (!(idev->if_flags & IF_READY)) { 4129 spin_unlock(&ifp->lock); 4130 read_unlock_bh(&idev->lock); 4131 /* 4132 * If the device is not ready: 4133 * - keep it tentative if it is a permanent address. 4134 * - otherwise, kill it. 4135 */ 4136 in6_ifa_hold(ifp); 4137 addrconf_dad_stop(ifp, 0); 4138 return; 4139 } 4140 4141 /* 4142 * Optimistic nodes can start receiving 4143 * Frames right away 4144 */ 4145 if (ifp->flags & IFA_F_OPTIMISTIC) { 4146 ip6_ins_rt(net, ifp->rt); 4147 if (ipv6_use_optimistic_addr(net, idev)) { 4148 /* Because optimistic nodes can use this address, 4149 * notify listeners. If DAD fails, RTM_DELADDR is sent. 4150 */ 4151 notify = true; 4152 } 4153 } 4154 4155 addrconf_dad_kick(ifp); 4156 out: 4157 spin_unlock(&ifp->lock); 4158 read_unlock_bh(&idev->lock); 4159 if (notify) 4160 ipv6_ifa_notify(RTM_NEWADDR, ifp); 4161 } 4162 4163 static void addrconf_dad_start(struct inet6_ifaddr *ifp) 4164 { 4165 bool begin_dad = false; 4166 4167 spin_lock_bh(&ifp->lock); 4168 if (ifp->state != INET6_IFADDR_STATE_DEAD) { 4169 ifp->state = INET6_IFADDR_STATE_PREDAD; 4170 begin_dad = true; 4171 } 4172 spin_unlock_bh(&ifp->lock); 4173 4174 if (begin_dad) 4175 addrconf_mod_dad_work(ifp, 0); 4176 } 4177 4178 static void addrconf_dad_work(struct work_struct *w) 4179 { 4180 struct inet6_ifaddr *ifp = container_of(to_delayed_work(w), 4181 struct inet6_ifaddr, 4182 dad_work); 4183 struct inet6_dev *idev = ifp->idev; 4184 bool bump_id, disable_ipv6 = false; 4185 struct in6_addr mcaddr; 4186 4187 enum { 4188 DAD_PROCESS, 4189 DAD_BEGIN, 4190 DAD_ABORT, 4191 } action = DAD_PROCESS; 4192 4193 rtnl_lock(); 4194 4195 spin_lock_bh(&ifp->lock); 4196 if (ifp->state == INET6_IFADDR_STATE_PREDAD) { 4197 action = DAD_BEGIN; 4198 ifp->state = INET6_IFADDR_STATE_DAD; 4199 } else if (ifp->state == INET6_IFADDR_STATE_ERRDAD) { 4200 action = DAD_ABORT; 4201 ifp->state = INET6_IFADDR_STATE_POSTDAD; 4202 4203 if ((READ_ONCE(dev_net(idev->dev)->ipv6.devconf_all->accept_dad) > 1 || 4204 READ_ONCE(idev->cnf.accept_dad) > 1) && 4205 !idev->cnf.disable_ipv6 && 4206 !(ifp->flags & IFA_F_STABLE_PRIVACY)) { 4207 struct in6_addr addr; 4208 4209 addr.s6_addr32[0] = htonl(0xfe800000); 4210 addr.s6_addr32[1] = 0; 4211 4212 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) && 4213 ipv6_addr_equal(&ifp->addr, &addr)) { 4214 /* DAD failed for link-local based on MAC */ 4215 WRITE_ONCE(idev->cnf.disable_ipv6, 1); 4216 4217 pr_info("%s: IPv6 being disabled!\n", 4218 ifp->idev->dev->name); 4219 disable_ipv6 = true; 4220 } 4221 } 4222 } 4223 spin_unlock_bh(&ifp->lock); 4224 4225 if (action == DAD_BEGIN) { 4226 addrconf_dad_begin(ifp); 4227 goto out; 4228 } else if (action == DAD_ABORT) { 4229 in6_ifa_hold(ifp); 4230 addrconf_dad_stop(ifp, 1); 4231 if (disable_ipv6) 4232 addrconf_ifdown(idev->dev, false); 4233 goto out; 4234 } 4235 4236 if (!ifp->dad_probes && addrconf_dad_end(ifp)) 4237 goto out; 4238 4239 write_lock_bh(&idev->lock); 4240 if (idev->dead || !(idev->if_flags & IF_READY)) { 4241 write_unlock_bh(&idev->lock); 4242 goto out; 4243 } 4244 4245 spin_lock(&ifp->lock); 4246 if (ifp->state == INET6_IFADDR_STATE_DEAD) { 4247 spin_unlock(&ifp->lock); 4248 write_unlock_bh(&idev->lock); 4249 goto out; 4250 } 4251 4252 if (ifp->dad_probes == 0) { 4253 bool send_na = false; 4254 4255 /* 4256 * DAD was successful 4257 */ 4258 4259 if (ifp->flags & IFA_F_TENTATIVE && 4260 !(ifp->flags & IFA_F_OPTIMISTIC)) 4261 send_na = true; 4262 bump_id = ifp->flags & IFA_F_TENTATIVE; 4263 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED); 4264 spin_unlock(&ifp->lock); 4265 write_unlock_bh(&idev->lock); 4266 4267 addrconf_dad_completed(ifp, bump_id, send_na); 4268 4269 goto out; 4270 } 4271 4272 ifp->dad_probes--; 4273 addrconf_mod_dad_work(ifp, 4274 max(NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME), 4275 HZ/100)); 4276 spin_unlock(&ifp->lock); 4277 write_unlock_bh(&idev->lock); 4278 4279 /* send a neighbour solicitation for our addr */ 4280 addrconf_addr_solict_mult(&ifp->addr, &mcaddr); 4281 ndisc_send_ns(ifp->idev->dev, &ifp->addr, &mcaddr, &in6addr_any, 4282 ifp->dad_nonce); 4283 out: 4284 in6_ifa_put(ifp); 4285 rtnl_unlock(); 4286 } 4287 4288 /* ifp->idev must be at least read locked */ 4289 static bool ipv6_lonely_lladdr(struct inet6_ifaddr *ifp) 4290 { 4291 struct inet6_ifaddr *ifpiter; 4292 struct inet6_dev *idev = ifp->idev; 4293 4294 list_for_each_entry_reverse(ifpiter, &idev->addr_list, if_list) { 4295 if (ifpiter->scope > IFA_LINK) 4296 break; 4297 if (ifp != ifpiter && ifpiter->scope == IFA_LINK && 4298 (ifpiter->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE| 4299 IFA_F_OPTIMISTIC|IFA_F_DADFAILED)) == 4300 IFA_F_PERMANENT) 4301 return false; 4302 } 4303 return true; 4304 } 4305 4306 static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id, 4307 bool send_na) 4308 { 4309 struct net_device *dev = ifp->idev->dev; 4310 struct in6_addr lladdr; 4311 bool send_rs, send_mld; 4312 4313 addrconf_del_dad_work(ifp); 4314 4315 /* 4316 * Configure the address for reception. Now it is valid. 4317 */ 4318 4319 ipv6_ifa_notify(RTM_NEWADDR, ifp); 4320 4321 /* If added prefix is link local and we are prepared to process 4322 router advertisements, start sending router solicitations. 4323 */ 4324 4325 read_lock_bh(&ifp->idev->lock); 4326 send_mld = ifp->scope == IFA_LINK && ipv6_lonely_lladdr(ifp); 4327 send_rs = send_mld && 4328 ipv6_accept_ra(ifp->idev) && 4329 READ_ONCE(ifp->idev->cnf.rtr_solicits) != 0 && 4330 (dev->flags & IFF_LOOPBACK) == 0 && 4331 (dev->type != ARPHRD_TUNNEL) && 4332 !netif_is_team_port(dev); 4333 read_unlock_bh(&ifp->idev->lock); 4334 4335 /* While dad is in progress mld report's source address is in6_addrany. 4336 * Resend with proper ll now. 4337 */ 4338 if (send_mld) 4339 ipv6_mc_dad_complete(ifp->idev); 4340 4341 /* send unsolicited NA if enabled */ 4342 if (send_na && 4343 (READ_ONCE(ifp->idev->cnf.ndisc_notify) || 4344 READ_ONCE(dev_net(dev)->ipv6.devconf_all->ndisc_notify))) { 4345 ndisc_send_na(dev, &in6addr_linklocal_allnodes, &ifp->addr, 4346 /*router=*/ !!ifp->idev->cnf.forwarding, 4347 /*solicited=*/ false, /*override=*/ true, 4348 /*inc_opt=*/ true); 4349 } 4350 4351 if (send_rs) { 4352 /* 4353 * If a host as already performed a random delay 4354 * [...] as part of DAD [...] there is no need 4355 * to delay again before sending the first RS 4356 */ 4357 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE)) 4358 return; 4359 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters); 4360 4361 write_lock_bh(&ifp->idev->lock); 4362 spin_lock(&ifp->lock); 4363 ifp->idev->rs_interval = rfc3315_s14_backoff_init( 4364 READ_ONCE(ifp->idev->cnf.rtr_solicit_interval)); 4365 ifp->idev->rs_probes = 1; 4366 ifp->idev->if_flags |= IF_RS_SENT; 4367 addrconf_mod_rs_timer(ifp->idev, ifp->idev->rs_interval); 4368 spin_unlock(&ifp->lock); 4369 write_unlock_bh(&ifp->idev->lock); 4370 } 4371 4372 if (bump_id) 4373 rt_genid_bump_ipv6(dev_net(dev)); 4374 4375 /* Make sure that a new temporary address will be created 4376 * before this temporary address becomes deprecated. 4377 */ 4378 if (ifp->flags & IFA_F_TEMPORARY) 4379 addrconf_verify_rtnl(dev_net(dev)); 4380 } 4381 4382 static void addrconf_dad_run(struct inet6_dev *idev, bool restart) 4383 { 4384 struct inet6_ifaddr *ifp; 4385 4386 read_lock_bh(&idev->lock); 4387 list_for_each_entry(ifp, &idev->addr_list, if_list) { 4388 spin_lock(&ifp->lock); 4389 if ((ifp->flags & IFA_F_TENTATIVE && 4390 ifp->state == INET6_IFADDR_STATE_DAD) || restart) { 4391 if (restart) 4392 ifp->state = INET6_IFADDR_STATE_PREDAD; 4393 addrconf_dad_kick(ifp); 4394 } 4395 spin_unlock(&ifp->lock); 4396 } 4397 read_unlock_bh(&idev->lock); 4398 } 4399 4400 #ifdef CONFIG_PROC_FS 4401 struct if6_iter_state { 4402 struct seq_net_private p; 4403 int bucket; 4404 int offset; 4405 }; 4406 4407 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos) 4408 { 4409 struct if6_iter_state *state = seq->private; 4410 struct net *net = seq_file_net(seq); 4411 struct inet6_ifaddr *ifa = NULL; 4412 int p = 0; 4413 4414 /* initial bucket if pos is 0 */ 4415 if (pos == 0) { 4416 state->bucket = 0; 4417 state->offset = 0; 4418 } 4419 4420 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) { 4421 hlist_for_each_entry_rcu(ifa, &net->ipv6.inet6_addr_lst[state->bucket], 4422 addr_lst) { 4423 /* sync with offset */ 4424 if (p < state->offset) { 4425 p++; 4426 continue; 4427 } 4428 return ifa; 4429 } 4430 4431 /* prepare for next bucket */ 4432 state->offset = 0; 4433 p = 0; 4434 } 4435 return NULL; 4436 } 4437 4438 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, 4439 struct inet6_ifaddr *ifa) 4440 { 4441 struct if6_iter_state *state = seq->private; 4442 struct net *net = seq_file_net(seq); 4443 4444 hlist_for_each_entry_continue_rcu(ifa, addr_lst) { 4445 state->offset++; 4446 return ifa; 4447 } 4448 4449 state->offset = 0; 4450 while (++state->bucket < IN6_ADDR_HSIZE) { 4451 hlist_for_each_entry_rcu(ifa, 4452 &net->ipv6.inet6_addr_lst[state->bucket], addr_lst) { 4453 return ifa; 4454 } 4455 } 4456 4457 return NULL; 4458 } 4459 4460 static void *if6_seq_start(struct seq_file *seq, loff_t *pos) 4461 __acquires(rcu) 4462 { 4463 rcu_read_lock(); 4464 return if6_get_first(seq, *pos); 4465 } 4466 4467 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos) 4468 { 4469 struct inet6_ifaddr *ifa; 4470 4471 ifa = if6_get_next(seq, v); 4472 ++*pos; 4473 return ifa; 4474 } 4475 4476 static void if6_seq_stop(struct seq_file *seq, void *v) 4477 __releases(rcu) 4478 { 4479 rcu_read_unlock(); 4480 } 4481 4482 static int if6_seq_show(struct seq_file *seq, void *v) 4483 { 4484 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v; 4485 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n", 4486 &ifp->addr, 4487 ifp->idev->dev->ifindex, 4488 ifp->prefix_len, 4489 ifp->scope, 4490 (u8) ifp->flags, 4491 ifp->idev->dev->name); 4492 return 0; 4493 } 4494 4495 static const struct seq_operations if6_seq_ops = { 4496 .start = if6_seq_start, 4497 .next = if6_seq_next, 4498 .show = if6_seq_show, 4499 .stop = if6_seq_stop, 4500 }; 4501 4502 static int __net_init if6_proc_net_init(struct net *net) 4503 { 4504 if (!proc_create_net("if_inet6", 0444, net->proc_net, &if6_seq_ops, 4505 sizeof(struct if6_iter_state))) 4506 return -ENOMEM; 4507 return 0; 4508 } 4509 4510 static void __net_exit if6_proc_net_exit(struct net *net) 4511 { 4512 remove_proc_entry("if_inet6", net->proc_net); 4513 } 4514 4515 static struct pernet_operations if6_proc_net_ops = { 4516 .init = if6_proc_net_init, 4517 .exit = if6_proc_net_exit, 4518 }; 4519 4520 int __init if6_proc_init(void) 4521 { 4522 return register_pernet_subsys(&if6_proc_net_ops); 4523 } 4524 4525 void if6_proc_exit(void) 4526 { 4527 unregister_pernet_subsys(&if6_proc_net_ops); 4528 } 4529 #endif /* CONFIG_PROC_FS */ 4530 4531 #if IS_ENABLED(CONFIG_IPV6_MIP6) 4532 /* Check if address is a home address configured on any interface. */ 4533 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr) 4534 { 4535 unsigned int hash = inet6_addr_hash(net, addr); 4536 struct inet6_ifaddr *ifp = NULL; 4537 int ret = 0; 4538 4539 rcu_read_lock(); 4540 hlist_for_each_entry_rcu(ifp, &net->ipv6.inet6_addr_lst[hash], addr_lst) { 4541 if (ipv6_addr_equal(&ifp->addr, addr) && 4542 (ifp->flags & IFA_F_HOMEADDRESS)) { 4543 ret = 1; 4544 break; 4545 } 4546 } 4547 rcu_read_unlock(); 4548 return ret; 4549 } 4550 #endif 4551 4552 /* RFC6554 has some algorithm to avoid loops in segment routing by 4553 * checking if the segments contains any of a local interface address. 4554 * 4555 * Quote: 4556 * 4557 * To detect loops in the SRH, a router MUST determine if the SRH 4558 * includes multiple addresses assigned to any interface on that router. 4559 * If such addresses appear more than once and are separated by at least 4560 * one address not assigned to that router. 4561 */ 4562 int ipv6_chk_rpl_srh_loop(struct net *net, const struct in6_addr *segs, 4563 unsigned char nsegs) 4564 { 4565 const struct in6_addr *addr; 4566 int i, ret = 0, found = 0; 4567 struct inet6_ifaddr *ifp; 4568 bool separated = false; 4569 unsigned int hash; 4570 bool hash_found; 4571 4572 rcu_read_lock(); 4573 for (i = 0; i < nsegs; i++) { 4574 addr = &segs[i]; 4575 hash = inet6_addr_hash(net, addr); 4576 4577 hash_found = false; 4578 hlist_for_each_entry_rcu(ifp, &net->ipv6.inet6_addr_lst[hash], addr_lst) { 4579 4580 if (ipv6_addr_equal(&ifp->addr, addr)) { 4581 hash_found = true; 4582 break; 4583 } 4584 } 4585 4586 if (hash_found) { 4587 if (found > 1 && separated) { 4588 ret = 1; 4589 break; 4590 } 4591 4592 separated = false; 4593 found++; 4594 } else { 4595 separated = true; 4596 } 4597 } 4598 rcu_read_unlock(); 4599 4600 return ret; 4601 } 4602 4603 /* 4604 * Periodic address status verification 4605 */ 4606 4607 static void addrconf_verify_rtnl(struct net *net) 4608 { 4609 unsigned long now, next, next_sec, next_sched; 4610 struct inet6_ifaddr *ifp; 4611 int i; 4612 4613 ASSERT_RTNL(); 4614 4615 rcu_read_lock_bh(); 4616 now = jiffies; 4617 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY); 4618 4619 cancel_delayed_work(&net->ipv6.addr_chk_work); 4620 4621 for (i = 0; i < IN6_ADDR_HSIZE; i++) { 4622 restart: 4623 hlist_for_each_entry_rcu_bh(ifp, &net->ipv6.inet6_addr_lst[i], addr_lst) { 4624 unsigned long age; 4625 4626 /* When setting preferred_lft to a value not zero or 4627 * infinity, while valid_lft is infinity 4628 * IFA_F_PERMANENT has a non-infinity life time. 4629 */ 4630 if ((ifp->flags & IFA_F_PERMANENT) && 4631 (ifp->prefered_lft == INFINITY_LIFE_TIME)) 4632 continue; 4633 4634 spin_lock(&ifp->lock); 4635 /* We try to batch several events at once. */ 4636 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ; 4637 4638 if ((ifp->flags&IFA_F_TEMPORARY) && 4639 !(ifp->flags&IFA_F_TENTATIVE) && 4640 ifp->prefered_lft != INFINITY_LIFE_TIME && 4641 !ifp->regen_count && ifp->ifpub) { 4642 /* This is a non-regenerated temporary addr. */ 4643 4644 unsigned long regen_advance = ipv6_get_regen_advance(ifp->idev); 4645 4646 if (age + regen_advance >= ifp->prefered_lft) { 4647 struct inet6_ifaddr *ifpub = ifp->ifpub; 4648 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 4649 next = ifp->tstamp + ifp->prefered_lft * HZ; 4650 4651 ifp->regen_count++; 4652 in6_ifa_hold(ifp); 4653 in6_ifa_hold(ifpub); 4654 spin_unlock(&ifp->lock); 4655 4656 spin_lock(&ifpub->lock); 4657 ifpub->regen_count = 0; 4658 spin_unlock(&ifpub->lock); 4659 rcu_read_unlock_bh(); 4660 ipv6_create_tempaddr(ifpub, true); 4661 in6_ifa_put(ifpub); 4662 in6_ifa_put(ifp); 4663 rcu_read_lock_bh(); 4664 goto restart; 4665 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next)) 4666 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ; 4667 } 4668 4669 if (ifp->valid_lft != INFINITY_LIFE_TIME && 4670 age >= ifp->valid_lft) { 4671 spin_unlock(&ifp->lock); 4672 in6_ifa_hold(ifp); 4673 rcu_read_unlock_bh(); 4674 ipv6_del_addr(ifp); 4675 rcu_read_lock_bh(); 4676 goto restart; 4677 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) { 4678 spin_unlock(&ifp->lock); 4679 continue; 4680 } else if (age >= ifp->prefered_lft) { 4681 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */ 4682 int deprecate = 0; 4683 4684 if (!(ifp->flags&IFA_F_DEPRECATED)) { 4685 deprecate = 1; 4686 ifp->flags |= IFA_F_DEPRECATED; 4687 } 4688 4689 if ((ifp->valid_lft != INFINITY_LIFE_TIME) && 4690 (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))) 4691 next = ifp->tstamp + ifp->valid_lft * HZ; 4692 4693 spin_unlock(&ifp->lock); 4694 4695 if (deprecate) { 4696 in6_ifa_hold(ifp); 4697 4698 ipv6_ifa_notify(0, ifp); 4699 in6_ifa_put(ifp); 4700 goto restart; 4701 } 4702 } else { 4703 /* ifp->prefered_lft <= ifp->valid_lft */ 4704 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 4705 next = ifp->tstamp + ifp->prefered_lft * HZ; 4706 spin_unlock(&ifp->lock); 4707 } 4708 } 4709 } 4710 4711 next_sec = round_jiffies_up(next); 4712 next_sched = next; 4713 4714 /* If rounded timeout is accurate enough, accept it. */ 4715 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ)) 4716 next_sched = next_sec; 4717 4718 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */ 4719 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX)) 4720 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX; 4721 4722 pr_debug("now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n", 4723 now, next, next_sec, next_sched); 4724 mod_delayed_work(addrconf_wq, &net->ipv6.addr_chk_work, next_sched - now); 4725 rcu_read_unlock_bh(); 4726 } 4727 4728 static void addrconf_verify_work(struct work_struct *w) 4729 { 4730 struct net *net = container_of(to_delayed_work(w), struct net, 4731 ipv6.addr_chk_work); 4732 4733 rtnl_lock(); 4734 addrconf_verify_rtnl(net); 4735 rtnl_unlock(); 4736 } 4737 4738 static void addrconf_verify(struct net *net) 4739 { 4740 mod_delayed_work(addrconf_wq, &net->ipv6.addr_chk_work, 0); 4741 } 4742 4743 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local, 4744 struct in6_addr **peer_pfx) 4745 { 4746 struct in6_addr *pfx = NULL; 4747 4748 *peer_pfx = NULL; 4749 4750 if (addr) 4751 pfx = nla_data(addr); 4752 4753 if (local) { 4754 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx))) 4755 *peer_pfx = pfx; 4756 pfx = nla_data(local); 4757 } 4758 4759 return pfx; 4760 } 4761 4762 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = { 4763 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) }, 4764 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) }, 4765 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) }, 4766 [IFA_FLAGS] = { .len = sizeof(u32) }, 4767 [IFA_RT_PRIORITY] = { .len = sizeof(u32) }, 4768 [IFA_TARGET_NETNSID] = { .type = NLA_S32 }, 4769 [IFA_PROTO] = { .type = NLA_U8 }, 4770 }; 4771 4772 static int 4773 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, 4774 struct netlink_ext_ack *extack) 4775 { 4776 struct net *net = sock_net(skb->sk); 4777 struct ifaddrmsg *ifm; 4778 struct nlattr *tb[IFA_MAX+1]; 4779 struct in6_addr *pfx, *peer_pfx; 4780 u32 ifa_flags; 4781 int err; 4782 4783 err = nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX, 4784 ifa_ipv6_policy, extack); 4785 if (err < 0) 4786 return err; 4787 4788 ifm = nlmsg_data(nlh); 4789 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx); 4790 if (!pfx) 4791 return -EINVAL; 4792 4793 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags; 4794 4795 /* We ignore other flags so far. */ 4796 ifa_flags &= IFA_F_MANAGETEMPADDR; 4797 4798 return inet6_addr_del(net, ifm->ifa_index, ifa_flags, pfx, 4799 ifm->ifa_prefixlen, extack); 4800 } 4801 4802 static int modify_prefix_route(struct inet6_ifaddr *ifp, 4803 unsigned long expires, u32 flags, 4804 bool modify_peer) 4805 { 4806 struct fib6_table *table; 4807 struct fib6_info *f6i; 4808 u32 prio; 4809 4810 f6i = addrconf_get_prefix_route(modify_peer ? &ifp->peer_addr : &ifp->addr, 4811 ifp->prefix_len, 4812 ifp->idev->dev, 0, RTF_DEFAULT, true); 4813 if (!f6i) 4814 return -ENOENT; 4815 4816 prio = ifp->rt_priority ? : IP6_RT_PRIO_ADDRCONF; 4817 if (f6i->fib6_metric != prio) { 4818 /* delete old one */ 4819 ip6_del_rt(dev_net(ifp->idev->dev), f6i, false); 4820 4821 /* add new one */ 4822 addrconf_prefix_route(modify_peer ? &ifp->peer_addr : &ifp->addr, 4823 ifp->prefix_len, 4824 ifp->rt_priority, ifp->idev->dev, 4825 expires, flags, GFP_KERNEL); 4826 } else { 4827 table = f6i->fib6_table; 4828 spin_lock_bh(&table->tb6_lock); 4829 4830 if (!(flags & RTF_EXPIRES)) { 4831 fib6_clean_expires(f6i); 4832 fib6_remove_gc_list(f6i); 4833 } else { 4834 fib6_set_expires(f6i, expires); 4835 fib6_add_gc_list(f6i); 4836 } 4837 4838 spin_unlock_bh(&table->tb6_lock); 4839 4840 fib6_info_release(f6i); 4841 } 4842 4843 return 0; 4844 } 4845 4846 static int inet6_addr_modify(struct net *net, struct inet6_ifaddr *ifp, 4847 struct ifa6_config *cfg) 4848 { 4849 u32 flags; 4850 clock_t expires; 4851 unsigned long timeout; 4852 bool was_managetempaddr; 4853 bool had_prefixroute; 4854 bool new_peer = false; 4855 4856 ASSERT_RTNL(); 4857 4858 if (!cfg->valid_lft || cfg->preferred_lft > cfg->valid_lft) 4859 return -EINVAL; 4860 4861 if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR && 4862 (ifp->flags & IFA_F_TEMPORARY || ifp->prefix_len != 64)) 4863 return -EINVAL; 4864 4865 if (!(ifp->flags & IFA_F_TENTATIVE) || ifp->flags & IFA_F_DADFAILED) 4866 cfg->ifa_flags &= ~IFA_F_OPTIMISTIC; 4867 4868 timeout = addrconf_timeout_fixup(cfg->valid_lft, HZ); 4869 if (addrconf_finite_timeout(timeout)) { 4870 expires = jiffies_to_clock_t(timeout * HZ); 4871 cfg->valid_lft = timeout; 4872 flags = RTF_EXPIRES; 4873 } else { 4874 expires = 0; 4875 flags = 0; 4876 cfg->ifa_flags |= IFA_F_PERMANENT; 4877 } 4878 4879 timeout = addrconf_timeout_fixup(cfg->preferred_lft, HZ); 4880 if (addrconf_finite_timeout(timeout)) { 4881 if (timeout == 0) 4882 cfg->ifa_flags |= IFA_F_DEPRECATED; 4883 cfg->preferred_lft = timeout; 4884 } 4885 4886 if (cfg->peer_pfx && 4887 memcmp(&ifp->peer_addr, cfg->peer_pfx, sizeof(struct in6_addr))) { 4888 if (!ipv6_addr_any(&ifp->peer_addr)) 4889 cleanup_prefix_route(ifp, expires, true, true); 4890 new_peer = true; 4891 } 4892 4893 spin_lock_bh(&ifp->lock); 4894 was_managetempaddr = ifp->flags & IFA_F_MANAGETEMPADDR; 4895 had_prefixroute = ifp->flags & IFA_F_PERMANENT && 4896 !(ifp->flags & IFA_F_NOPREFIXROUTE); 4897 ifp->flags &= ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | 4898 IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR | 4899 IFA_F_NOPREFIXROUTE); 4900 ifp->flags |= cfg->ifa_flags; 4901 ifp->tstamp = jiffies; 4902 ifp->valid_lft = cfg->valid_lft; 4903 ifp->prefered_lft = cfg->preferred_lft; 4904 ifp->ifa_proto = cfg->ifa_proto; 4905 4906 if (cfg->rt_priority && cfg->rt_priority != ifp->rt_priority) 4907 ifp->rt_priority = cfg->rt_priority; 4908 4909 if (new_peer) 4910 ifp->peer_addr = *cfg->peer_pfx; 4911 4912 spin_unlock_bh(&ifp->lock); 4913 if (!(ifp->flags&IFA_F_TENTATIVE)) 4914 ipv6_ifa_notify(0, ifp); 4915 4916 if (!(cfg->ifa_flags & IFA_F_NOPREFIXROUTE)) { 4917 int rc = -ENOENT; 4918 4919 if (had_prefixroute) 4920 rc = modify_prefix_route(ifp, expires, flags, false); 4921 4922 /* prefix route could have been deleted; if so restore it */ 4923 if (rc == -ENOENT) { 4924 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, 4925 ifp->rt_priority, ifp->idev->dev, 4926 expires, flags, GFP_KERNEL); 4927 } 4928 4929 if (had_prefixroute && !ipv6_addr_any(&ifp->peer_addr)) 4930 rc = modify_prefix_route(ifp, expires, flags, true); 4931 4932 if (rc == -ENOENT && !ipv6_addr_any(&ifp->peer_addr)) { 4933 addrconf_prefix_route(&ifp->peer_addr, ifp->prefix_len, 4934 ifp->rt_priority, ifp->idev->dev, 4935 expires, flags, GFP_KERNEL); 4936 } 4937 } else if (had_prefixroute) { 4938 enum cleanup_prefix_rt_t action; 4939 unsigned long rt_expires; 4940 4941 write_lock_bh(&ifp->idev->lock); 4942 action = check_cleanup_prefix_route(ifp, &rt_expires); 4943 write_unlock_bh(&ifp->idev->lock); 4944 4945 if (action != CLEANUP_PREFIX_RT_NOP) { 4946 cleanup_prefix_route(ifp, rt_expires, 4947 action == CLEANUP_PREFIX_RT_DEL, false); 4948 } 4949 } 4950 4951 if (was_managetempaddr || ifp->flags & IFA_F_MANAGETEMPADDR) { 4952 if (was_managetempaddr && 4953 !(ifp->flags & IFA_F_MANAGETEMPADDR)) { 4954 cfg->valid_lft = 0; 4955 cfg->preferred_lft = 0; 4956 } 4957 manage_tempaddrs(ifp->idev, ifp, cfg->valid_lft, 4958 cfg->preferred_lft, !was_managetempaddr, 4959 jiffies); 4960 } 4961 4962 addrconf_verify_rtnl(net); 4963 4964 return 0; 4965 } 4966 4967 static int 4968 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, 4969 struct netlink_ext_ack *extack) 4970 { 4971 struct net *net = sock_net(skb->sk); 4972 struct ifaddrmsg *ifm; 4973 struct nlattr *tb[IFA_MAX+1]; 4974 struct in6_addr *peer_pfx; 4975 struct inet6_ifaddr *ifa; 4976 struct net_device *dev; 4977 struct inet6_dev *idev; 4978 struct ifa6_config cfg; 4979 int err; 4980 4981 err = nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX, 4982 ifa_ipv6_policy, extack); 4983 if (err < 0) 4984 return err; 4985 4986 memset(&cfg, 0, sizeof(cfg)); 4987 4988 ifm = nlmsg_data(nlh); 4989 cfg.pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx); 4990 if (!cfg.pfx) 4991 return -EINVAL; 4992 4993 cfg.peer_pfx = peer_pfx; 4994 cfg.plen = ifm->ifa_prefixlen; 4995 if (tb[IFA_RT_PRIORITY]) 4996 cfg.rt_priority = nla_get_u32(tb[IFA_RT_PRIORITY]); 4997 4998 if (tb[IFA_PROTO]) 4999 cfg.ifa_proto = nla_get_u8(tb[IFA_PROTO]); 5000 5001 cfg.valid_lft = INFINITY_LIFE_TIME; 5002 cfg.preferred_lft = INFINITY_LIFE_TIME; 5003 5004 if (tb[IFA_CACHEINFO]) { 5005 struct ifa_cacheinfo *ci; 5006 5007 ci = nla_data(tb[IFA_CACHEINFO]); 5008 cfg.valid_lft = ci->ifa_valid; 5009 cfg.preferred_lft = ci->ifa_prefered; 5010 } 5011 5012 dev = __dev_get_by_index(net, ifm->ifa_index); 5013 if (!dev) { 5014 NL_SET_ERR_MSG_MOD(extack, "Unable to find the interface"); 5015 return -ENODEV; 5016 } 5017 5018 if (tb[IFA_FLAGS]) 5019 cfg.ifa_flags = nla_get_u32(tb[IFA_FLAGS]); 5020 else 5021 cfg.ifa_flags = ifm->ifa_flags; 5022 5023 /* We ignore other flags so far. */ 5024 cfg.ifa_flags &= IFA_F_NODAD | IFA_F_HOMEADDRESS | 5025 IFA_F_MANAGETEMPADDR | IFA_F_NOPREFIXROUTE | 5026 IFA_F_MCAUTOJOIN | IFA_F_OPTIMISTIC; 5027 5028 idev = ipv6_find_idev(dev); 5029 if (IS_ERR(idev)) 5030 return PTR_ERR(idev); 5031 5032 if (!ipv6_allow_optimistic_dad(net, idev)) 5033 cfg.ifa_flags &= ~IFA_F_OPTIMISTIC; 5034 5035 if (cfg.ifa_flags & IFA_F_NODAD && 5036 cfg.ifa_flags & IFA_F_OPTIMISTIC) { 5037 NL_SET_ERR_MSG(extack, "IFA_F_NODAD and IFA_F_OPTIMISTIC are mutually exclusive"); 5038 return -EINVAL; 5039 } 5040 5041 ifa = ipv6_get_ifaddr(net, cfg.pfx, dev, 1); 5042 if (!ifa) { 5043 /* 5044 * It would be best to check for !NLM_F_CREATE here but 5045 * userspace already relies on not having to provide this. 5046 */ 5047 return inet6_addr_add(net, ifm->ifa_index, &cfg, extack); 5048 } 5049 5050 if (nlh->nlmsg_flags & NLM_F_EXCL || 5051 !(nlh->nlmsg_flags & NLM_F_REPLACE)) { 5052 NL_SET_ERR_MSG_MOD(extack, "address already assigned"); 5053 err = -EEXIST; 5054 } else { 5055 err = inet6_addr_modify(net, ifa, &cfg); 5056 } 5057 5058 in6_ifa_put(ifa); 5059 5060 return err; 5061 } 5062 5063 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u32 flags, 5064 u8 scope, int ifindex) 5065 { 5066 struct ifaddrmsg *ifm; 5067 5068 ifm = nlmsg_data(nlh); 5069 ifm->ifa_family = AF_INET6; 5070 ifm->ifa_prefixlen = prefixlen; 5071 ifm->ifa_flags = flags; 5072 ifm->ifa_scope = scope; 5073 ifm->ifa_index = ifindex; 5074 } 5075 5076 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp, 5077 unsigned long tstamp, u32 preferred, u32 valid) 5078 { 5079 struct ifa_cacheinfo ci; 5080 5081 ci.cstamp = cstamp_delta(cstamp); 5082 ci.tstamp = cstamp_delta(tstamp); 5083 ci.ifa_prefered = preferred; 5084 ci.ifa_valid = valid; 5085 5086 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci); 5087 } 5088 5089 static inline int rt_scope(int ifa_scope) 5090 { 5091 if (ifa_scope & IFA_HOST) 5092 return RT_SCOPE_HOST; 5093 else if (ifa_scope & IFA_LINK) 5094 return RT_SCOPE_LINK; 5095 else if (ifa_scope & IFA_SITE) 5096 return RT_SCOPE_SITE; 5097 else 5098 return RT_SCOPE_UNIVERSE; 5099 } 5100 5101 static inline int inet6_ifaddr_msgsize(void) 5102 { 5103 return NLMSG_ALIGN(sizeof(struct ifaddrmsg)) 5104 + nla_total_size(16) /* IFA_LOCAL */ 5105 + nla_total_size(16) /* IFA_ADDRESS */ 5106 + nla_total_size(sizeof(struct ifa_cacheinfo)) 5107 + nla_total_size(4) /* IFA_FLAGS */ 5108 + nla_total_size(1) /* IFA_PROTO */ 5109 + nla_total_size(4) /* IFA_RT_PRIORITY */; 5110 } 5111 5112 enum addr_type_t { 5113 UNICAST_ADDR, 5114 MULTICAST_ADDR, 5115 ANYCAST_ADDR, 5116 }; 5117 5118 struct inet6_fill_args { 5119 u32 portid; 5120 u32 seq; 5121 int event; 5122 unsigned int flags; 5123 int netnsid; 5124 int ifindex; 5125 enum addr_type_t type; 5126 }; 5127 5128 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa, 5129 struct inet6_fill_args *args) 5130 { 5131 struct nlmsghdr *nlh; 5132 u32 preferred, valid; 5133 5134 nlh = nlmsg_put(skb, args->portid, args->seq, args->event, 5135 sizeof(struct ifaddrmsg), args->flags); 5136 if (!nlh) 5137 return -EMSGSIZE; 5138 5139 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope), 5140 ifa->idev->dev->ifindex); 5141 5142 if (args->netnsid >= 0 && 5143 nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid)) 5144 goto error; 5145 5146 spin_lock_bh(&ifa->lock); 5147 if (!((ifa->flags&IFA_F_PERMANENT) && 5148 (ifa->prefered_lft == INFINITY_LIFE_TIME))) { 5149 preferred = ifa->prefered_lft; 5150 valid = ifa->valid_lft; 5151 if (preferred != INFINITY_LIFE_TIME) { 5152 long tval = (jiffies - ifa->tstamp)/HZ; 5153 if (preferred > tval) 5154 preferred -= tval; 5155 else 5156 preferred = 0; 5157 if (valid != INFINITY_LIFE_TIME) { 5158 if (valid > tval) 5159 valid -= tval; 5160 else 5161 valid = 0; 5162 } 5163 } 5164 } else { 5165 preferred = INFINITY_LIFE_TIME; 5166 valid = INFINITY_LIFE_TIME; 5167 } 5168 spin_unlock_bh(&ifa->lock); 5169 5170 if (!ipv6_addr_any(&ifa->peer_addr)) { 5171 if (nla_put_in6_addr(skb, IFA_LOCAL, &ifa->addr) < 0 || 5172 nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->peer_addr) < 0) 5173 goto error; 5174 } else 5175 if (nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->addr) < 0) 5176 goto error; 5177 5178 if (ifa->rt_priority && 5179 nla_put_u32(skb, IFA_RT_PRIORITY, ifa->rt_priority)) 5180 goto error; 5181 5182 if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) 5183 goto error; 5184 5185 if (nla_put_u32(skb, IFA_FLAGS, ifa->flags) < 0) 5186 goto error; 5187 5188 if (ifa->ifa_proto && 5189 nla_put_u8(skb, IFA_PROTO, ifa->ifa_proto)) 5190 goto error; 5191 5192 nlmsg_end(skb, nlh); 5193 return 0; 5194 5195 error: 5196 nlmsg_cancel(skb, nlh); 5197 return -EMSGSIZE; 5198 } 5199 5200 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca, 5201 struct inet6_fill_args *args) 5202 { 5203 struct nlmsghdr *nlh; 5204 u8 scope = RT_SCOPE_UNIVERSE; 5205 int ifindex = ifmca->idev->dev->ifindex; 5206 5207 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE) 5208 scope = RT_SCOPE_SITE; 5209 5210 nlh = nlmsg_put(skb, args->portid, args->seq, args->event, 5211 sizeof(struct ifaddrmsg), args->flags); 5212 if (!nlh) 5213 return -EMSGSIZE; 5214 5215 if (args->netnsid >= 0 && 5216 nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid)) { 5217 nlmsg_cancel(skb, nlh); 5218 return -EMSGSIZE; 5219 } 5220 5221 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 5222 if (nla_put_in6_addr(skb, IFA_MULTICAST, &ifmca->mca_addr) < 0 || 5223 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp, 5224 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 5225 nlmsg_cancel(skb, nlh); 5226 return -EMSGSIZE; 5227 } 5228 5229 nlmsg_end(skb, nlh); 5230 return 0; 5231 } 5232 5233 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca, 5234 struct inet6_fill_args *args) 5235 { 5236 struct net_device *dev = fib6_info_nh_dev(ifaca->aca_rt); 5237 int ifindex = dev ? dev->ifindex : 1; 5238 struct nlmsghdr *nlh; 5239 u8 scope = RT_SCOPE_UNIVERSE; 5240 5241 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE) 5242 scope = RT_SCOPE_SITE; 5243 5244 nlh = nlmsg_put(skb, args->portid, args->seq, args->event, 5245 sizeof(struct ifaddrmsg), args->flags); 5246 if (!nlh) 5247 return -EMSGSIZE; 5248 5249 if (args->netnsid >= 0 && 5250 nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid)) { 5251 nlmsg_cancel(skb, nlh); 5252 return -EMSGSIZE; 5253 } 5254 5255 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 5256 if (nla_put_in6_addr(skb, IFA_ANYCAST, &ifaca->aca_addr) < 0 || 5257 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp, 5258 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 5259 nlmsg_cancel(skb, nlh); 5260 return -EMSGSIZE; 5261 } 5262 5263 nlmsg_end(skb, nlh); 5264 return 0; 5265 } 5266 5267 /* called with rcu_read_lock() */ 5268 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb, 5269 struct netlink_callback *cb, int s_ip_idx, 5270 struct inet6_fill_args *fillargs) 5271 { 5272 struct ifmcaddr6 *ifmca; 5273 struct ifacaddr6 *ifaca; 5274 int ip_idx = 0; 5275 int err = 1; 5276 5277 read_lock_bh(&idev->lock); 5278 switch (fillargs->type) { 5279 case UNICAST_ADDR: { 5280 struct inet6_ifaddr *ifa; 5281 fillargs->event = RTM_NEWADDR; 5282 5283 /* unicast address incl. temp addr */ 5284 list_for_each_entry(ifa, &idev->addr_list, if_list) { 5285 if (ip_idx < s_ip_idx) 5286 goto next; 5287 err = inet6_fill_ifaddr(skb, ifa, fillargs); 5288 if (err < 0) 5289 break; 5290 nl_dump_check_consistent(cb, nlmsg_hdr(skb)); 5291 next: 5292 ip_idx++; 5293 } 5294 break; 5295 } 5296 case MULTICAST_ADDR: 5297 read_unlock_bh(&idev->lock); 5298 fillargs->event = RTM_GETMULTICAST; 5299 5300 /* multicast address */ 5301 for (ifmca = rcu_dereference(idev->mc_list); 5302 ifmca; 5303 ifmca = rcu_dereference(ifmca->next), ip_idx++) { 5304 if (ip_idx < s_ip_idx) 5305 continue; 5306 err = inet6_fill_ifmcaddr(skb, ifmca, fillargs); 5307 if (err < 0) 5308 break; 5309 } 5310 read_lock_bh(&idev->lock); 5311 break; 5312 case ANYCAST_ADDR: 5313 fillargs->event = RTM_GETANYCAST; 5314 /* anycast address */ 5315 for (ifaca = rcu_dereference(idev->ac_list); ifaca; 5316 ifaca = rcu_dereference(ifaca->aca_next), ip_idx++) { 5317 if (ip_idx < s_ip_idx) 5318 continue; 5319 err = inet6_fill_ifacaddr(skb, ifaca, fillargs); 5320 if (err < 0) 5321 break; 5322 } 5323 break; 5324 default: 5325 break; 5326 } 5327 read_unlock_bh(&idev->lock); 5328 cb->args[2] = ip_idx; 5329 return err; 5330 } 5331 5332 static int inet6_valid_dump_ifaddr_req(const struct nlmsghdr *nlh, 5333 struct inet6_fill_args *fillargs, 5334 struct net **tgt_net, struct sock *sk, 5335 struct netlink_callback *cb) 5336 { 5337 struct netlink_ext_ack *extack = cb->extack; 5338 struct nlattr *tb[IFA_MAX+1]; 5339 struct ifaddrmsg *ifm; 5340 int err, i; 5341 5342 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) { 5343 NL_SET_ERR_MSG_MOD(extack, "Invalid header for address dump request"); 5344 return -EINVAL; 5345 } 5346 5347 ifm = nlmsg_data(nlh); 5348 if (ifm->ifa_prefixlen || ifm->ifa_flags || ifm->ifa_scope) { 5349 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for address dump request"); 5350 return -EINVAL; 5351 } 5352 5353 fillargs->ifindex = ifm->ifa_index; 5354 if (fillargs->ifindex) { 5355 cb->answer_flags |= NLM_F_DUMP_FILTERED; 5356 fillargs->flags |= NLM_F_DUMP_FILTERED; 5357 } 5358 5359 err = nlmsg_parse_deprecated_strict(nlh, sizeof(*ifm), tb, IFA_MAX, 5360 ifa_ipv6_policy, extack); 5361 if (err < 0) 5362 return err; 5363 5364 for (i = 0; i <= IFA_MAX; ++i) { 5365 if (!tb[i]) 5366 continue; 5367 5368 if (i == IFA_TARGET_NETNSID) { 5369 struct net *net; 5370 5371 fillargs->netnsid = nla_get_s32(tb[i]); 5372 net = rtnl_get_net_ns_capable(sk, fillargs->netnsid); 5373 if (IS_ERR(net)) { 5374 fillargs->netnsid = -1; 5375 NL_SET_ERR_MSG_MOD(extack, "Invalid target network namespace id"); 5376 return PTR_ERR(net); 5377 } 5378 *tgt_net = net; 5379 } else { 5380 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in dump request"); 5381 return -EINVAL; 5382 } 5383 } 5384 5385 return 0; 5386 } 5387 5388 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb, 5389 enum addr_type_t type) 5390 { 5391 const struct nlmsghdr *nlh = cb->nlh; 5392 struct inet6_fill_args fillargs = { 5393 .portid = NETLINK_CB(cb->skb).portid, 5394 .seq = cb->nlh->nlmsg_seq, 5395 .flags = NLM_F_MULTI, 5396 .netnsid = -1, 5397 .type = type, 5398 }; 5399 struct net *tgt_net = sock_net(skb->sk); 5400 int idx, s_idx, s_ip_idx; 5401 int h, s_h; 5402 struct net_device *dev; 5403 struct inet6_dev *idev; 5404 struct hlist_head *head; 5405 int err = 0; 5406 5407 s_h = cb->args[0]; 5408 s_idx = idx = cb->args[1]; 5409 s_ip_idx = cb->args[2]; 5410 5411 rcu_read_lock(); 5412 if (cb->strict_check) { 5413 err = inet6_valid_dump_ifaddr_req(nlh, &fillargs, &tgt_net, 5414 skb->sk, cb); 5415 if (err < 0) 5416 goto put_tgt_net; 5417 5418 err = 0; 5419 if (fillargs.ifindex) { 5420 dev = __dev_get_by_index(tgt_net, fillargs.ifindex); 5421 if (!dev) { 5422 err = -ENODEV; 5423 goto put_tgt_net; 5424 } 5425 idev = __in6_dev_get(dev); 5426 if (idev) { 5427 err = in6_dump_addrs(idev, skb, cb, s_ip_idx, 5428 &fillargs); 5429 if (err > 0) 5430 err = 0; 5431 } 5432 goto put_tgt_net; 5433 } 5434 } 5435 5436 cb->seq = inet6_base_seq(tgt_net); 5437 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 5438 idx = 0; 5439 head = &tgt_net->dev_index_head[h]; 5440 hlist_for_each_entry_rcu(dev, head, index_hlist) { 5441 if (idx < s_idx) 5442 goto cont; 5443 if (h > s_h || idx > s_idx) 5444 s_ip_idx = 0; 5445 idev = __in6_dev_get(dev); 5446 if (!idev) 5447 goto cont; 5448 5449 if (in6_dump_addrs(idev, skb, cb, s_ip_idx, 5450 &fillargs) < 0) 5451 goto done; 5452 cont: 5453 idx++; 5454 } 5455 } 5456 done: 5457 cb->args[0] = h; 5458 cb->args[1] = idx; 5459 put_tgt_net: 5460 rcu_read_unlock(); 5461 if (fillargs.netnsid >= 0) 5462 put_net(tgt_net); 5463 5464 return skb->len ? : err; 5465 } 5466 5467 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb) 5468 { 5469 enum addr_type_t type = UNICAST_ADDR; 5470 5471 return inet6_dump_addr(skb, cb, type); 5472 } 5473 5474 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb) 5475 { 5476 enum addr_type_t type = MULTICAST_ADDR; 5477 5478 return inet6_dump_addr(skb, cb, type); 5479 } 5480 5481 5482 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb) 5483 { 5484 enum addr_type_t type = ANYCAST_ADDR; 5485 5486 return inet6_dump_addr(skb, cb, type); 5487 } 5488 5489 static int inet6_rtm_valid_getaddr_req(struct sk_buff *skb, 5490 const struct nlmsghdr *nlh, 5491 struct nlattr **tb, 5492 struct netlink_ext_ack *extack) 5493 { 5494 struct ifaddrmsg *ifm; 5495 int i, err; 5496 5497 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) { 5498 NL_SET_ERR_MSG_MOD(extack, "Invalid header for get address request"); 5499 return -EINVAL; 5500 } 5501 5502 if (!netlink_strict_get_check(skb)) 5503 return nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX, 5504 ifa_ipv6_policy, extack); 5505 5506 ifm = nlmsg_data(nlh); 5507 if (ifm->ifa_prefixlen || ifm->ifa_flags || ifm->ifa_scope) { 5508 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for get address request"); 5509 return -EINVAL; 5510 } 5511 5512 err = nlmsg_parse_deprecated_strict(nlh, sizeof(*ifm), tb, IFA_MAX, 5513 ifa_ipv6_policy, extack); 5514 if (err) 5515 return err; 5516 5517 for (i = 0; i <= IFA_MAX; i++) { 5518 if (!tb[i]) 5519 continue; 5520 5521 switch (i) { 5522 case IFA_TARGET_NETNSID: 5523 case IFA_ADDRESS: 5524 case IFA_LOCAL: 5525 break; 5526 default: 5527 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in get address request"); 5528 return -EINVAL; 5529 } 5530 } 5531 5532 return 0; 5533 } 5534 5535 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh, 5536 struct netlink_ext_ack *extack) 5537 { 5538 struct net *tgt_net = sock_net(in_skb->sk); 5539 struct inet6_fill_args fillargs = { 5540 .portid = NETLINK_CB(in_skb).portid, 5541 .seq = nlh->nlmsg_seq, 5542 .event = RTM_NEWADDR, 5543 .flags = 0, 5544 .netnsid = -1, 5545 }; 5546 struct ifaddrmsg *ifm; 5547 struct nlattr *tb[IFA_MAX+1]; 5548 struct in6_addr *addr = NULL, *peer; 5549 struct net_device *dev = NULL; 5550 struct inet6_ifaddr *ifa; 5551 struct sk_buff *skb; 5552 int err; 5553 5554 err = inet6_rtm_valid_getaddr_req(in_skb, nlh, tb, extack); 5555 if (err < 0) 5556 return err; 5557 5558 if (tb[IFA_TARGET_NETNSID]) { 5559 fillargs.netnsid = nla_get_s32(tb[IFA_TARGET_NETNSID]); 5560 5561 tgt_net = rtnl_get_net_ns_capable(NETLINK_CB(in_skb).sk, 5562 fillargs.netnsid); 5563 if (IS_ERR(tgt_net)) 5564 return PTR_ERR(tgt_net); 5565 } 5566 5567 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer); 5568 if (!addr) { 5569 err = -EINVAL; 5570 goto errout; 5571 } 5572 ifm = nlmsg_data(nlh); 5573 if (ifm->ifa_index) 5574 dev = dev_get_by_index(tgt_net, ifm->ifa_index); 5575 5576 ifa = ipv6_get_ifaddr(tgt_net, addr, dev, 1); 5577 if (!ifa) { 5578 err = -EADDRNOTAVAIL; 5579 goto errout; 5580 } 5581 5582 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL); 5583 if (!skb) { 5584 err = -ENOBUFS; 5585 goto errout_ifa; 5586 } 5587 5588 err = inet6_fill_ifaddr(skb, ifa, &fillargs); 5589 if (err < 0) { 5590 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 5591 WARN_ON(err == -EMSGSIZE); 5592 kfree_skb(skb); 5593 goto errout_ifa; 5594 } 5595 err = rtnl_unicast(skb, tgt_net, NETLINK_CB(in_skb).portid); 5596 errout_ifa: 5597 in6_ifa_put(ifa); 5598 errout: 5599 dev_put(dev); 5600 if (fillargs.netnsid >= 0) 5601 put_net(tgt_net); 5602 5603 return err; 5604 } 5605 5606 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa) 5607 { 5608 struct sk_buff *skb; 5609 struct net *net = dev_net(ifa->idev->dev); 5610 struct inet6_fill_args fillargs = { 5611 .portid = 0, 5612 .seq = 0, 5613 .event = event, 5614 .flags = 0, 5615 .netnsid = -1, 5616 }; 5617 int err = -ENOBUFS; 5618 5619 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC); 5620 if (!skb) 5621 goto errout; 5622 5623 err = inet6_fill_ifaddr(skb, ifa, &fillargs); 5624 if (err < 0) { 5625 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 5626 WARN_ON(err == -EMSGSIZE); 5627 kfree_skb(skb); 5628 goto errout; 5629 } 5630 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC); 5631 return; 5632 errout: 5633 if (err < 0) 5634 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err); 5635 } 5636 5637 static void ipv6_store_devconf(const struct ipv6_devconf *cnf, 5638 __s32 *array, int bytes) 5639 { 5640 BUG_ON(bytes < (DEVCONF_MAX * 4)); 5641 5642 memset(array, 0, bytes); 5643 array[DEVCONF_FORWARDING] = READ_ONCE(cnf->forwarding); 5644 array[DEVCONF_HOPLIMIT] = READ_ONCE(cnf->hop_limit); 5645 array[DEVCONF_MTU6] = READ_ONCE(cnf->mtu6); 5646 array[DEVCONF_ACCEPT_RA] = READ_ONCE(cnf->accept_ra); 5647 array[DEVCONF_ACCEPT_REDIRECTS] = READ_ONCE(cnf->accept_redirects); 5648 array[DEVCONF_AUTOCONF] = READ_ONCE(cnf->autoconf); 5649 array[DEVCONF_DAD_TRANSMITS] = READ_ONCE(cnf->dad_transmits); 5650 array[DEVCONF_RTR_SOLICITS] = READ_ONCE(cnf->rtr_solicits); 5651 array[DEVCONF_RTR_SOLICIT_INTERVAL] = 5652 jiffies_to_msecs(READ_ONCE(cnf->rtr_solicit_interval)); 5653 array[DEVCONF_RTR_SOLICIT_MAX_INTERVAL] = 5654 jiffies_to_msecs(READ_ONCE(cnf->rtr_solicit_max_interval)); 5655 array[DEVCONF_RTR_SOLICIT_DELAY] = 5656 jiffies_to_msecs(READ_ONCE(cnf->rtr_solicit_delay)); 5657 array[DEVCONF_FORCE_MLD_VERSION] = READ_ONCE(cnf->force_mld_version); 5658 array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] = 5659 jiffies_to_msecs(READ_ONCE(cnf->mldv1_unsolicited_report_interval)); 5660 array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] = 5661 jiffies_to_msecs(READ_ONCE(cnf->mldv2_unsolicited_report_interval)); 5662 array[DEVCONF_USE_TEMPADDR] = READ_ONCE(cnf->use_tempaddr); 5663 array[DEVCONF_TEMP_VALID_LFT] = READ_ONCE(cnf->temp_valid_lft); 5664 array[DEVCONF_TEMP_PREFERED_LFT] = READ_ONCE(cnf->temp_prefered_lft); 5665 array[DEVCONF_REGEN_MAX_RETRY] = READ_ONCE(cnf->regen_max_retry); 5666 array[DEVCONF_MAX_DESYNC_FACTOR] = READ_ONCE(cnf->max_desync_factor); 5667 array[DEVCONF_MAX_ADDRESSES] = READ_ONCE(cnf->max_addresses); 5668 array[DEVCONF_ACCEPT_RA_DEFRTR] = READ_ONCE(cnf->accept_ra_defrtr); 5669 array[DEVCONF_RA_DEFRTR_METRIC] = READ_ONCE(cnf->ra_defrtr_metric); 5670 array[DEVCONF_ACCEPT_RA_MIN_HOP_LIMIT] = 5671 READ_ONCE(cnf->accept_ra_min_hop_limit); 5672 array[DEVCONF_ACCEPT_RA_PINFO] = READ_ONCE(cnf->accept_ra_pinfo); 5673 #ifdef CONFIG_IPV6_ROUTER_PREF 5674 array[DEVCONF_ACCEPT_RA_RTR_PREF] = READ_ONCE(cnf->accept_ra_rtr_pref); 5675 array[DEVCONF_RTR_PROBE_INTERVAL] = 5676 jiffies_to_msecs(READ_ONCE(cnf->rtr_probe_interval)); 5677 #ifdef CONFIG_IPV6_ROUTE_INFO 5678 array[DEVCONF_ACCEPT_RA_RT_INFO_MIN_PLEN] = 5679 READ_ONCE(cnf->accept_ra_rt_info_min_plen); 5680 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = 5681 READ_ONCE(cnf->accept_ra_rt_info_max_plen); 5682 #endif 5683 #endif 5684 array[DEVCONF_PROXY_NDP] = READ_ONCE(cnf->proxy_ndp); 5685 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = 5686 READ_ONCE(cnf->accept_source_route); 5687 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 5688 array[DEVCONF_OPTIMISTIC_DAD] = READ_ONCE(cnf->optimistic_dad); 5689 array[DEVCONF_USE_OPTIMISTIC] = READ_ONCE(cnf->use_optimistic); 5690 #endif 5691 #ifdef CONFIG_IPV6_MROUTE 5692 array[DEVCONF_MC_FORWARDING] = atomic_read(&cnf->mc_forwarding); 5693 #endif 5694 array[DEVCONF_DISABLE_IPV6] = READ_ONCE(cnf->disable_ipv6); 5695 array[DEVCONF_ACCEPT_DAD] = READ_ONCE(cnf->accept_dad); 5696 array[DEVCONF_FORCE_TLLAO] = READ_ONCE(cnf->force_tllao); 5697 array[DEVCONF_NDISC_NOTIFY] = READ_ONCE(cnf->ndisc_notify); 5698 array[DEVCONF_SUPPRESS_FRAG_NDISC] = 5699 READ_ONCE(cnf->suppress_frag_ndisc); 5700 array[DEVCONF_ACCEPT_RA_FROM_LOCAL] = 5701 READ_ONCE(cnf->accept_ra_from_local); 5702 array[DEVCONF_ACCEPT_RA_MTU] = READ_ONCE(cnf->accept_ra_mtu); 5703 array[DEVCONF_IGNORE_ROUTES_WITH_LINKDOWN] = 5704 READ_ONCE(cnf->ignore_routes_with_linkdown); 5705 /* we omit DEVCONF_STABLE_SECRET for now */ 5706 array[DEVCONF_USE_OIF_ADDRS_ONLY] = READ_ONCE(cnf->use_oif_addrs_only); 5707 array[DEVCONF_DROP_UNICAST_IN_L2_MULTICAST] = 5708 READ_ONCE(cnf->drop_unicast_in_l2_multicast); 5709 array[DEVCONF_DROP_UNSOLICITED_NA] = READ_ONCE(cnf->drop_unsolicited_na); 5710 array[DEVCONF_KEEP_ADDR_ON_DOWN] = READ_ONCE(cnf->keep_addr_on_down); 5711 array[DEVCONF_SEG6_ENABLED] = READ_ONCE(cnf->seg6_enabled); 5712 #ifdef CONFIG_IPV6_SEG6_HMAC 5713 array[DEVCONF_SEG6_REQUIRE_HMAC] = READ_ONCE(cnf->seg6_require_hmac); 5714 #endif 5715 array[DEVCONF_ENHANCED_DAD] = READ_ONCE(cnf->enhanced_dad); 5716 array[DEVCONF_ADDR_GEN_MODE] = READ_ONCE(cnf->addr_gen_mode); 5717 array[DEVCONF_DISABLE_POLICY] = READ_ONCE(cnf->disable_policy); 5718 array[DEVCONF_NDISC_TCLASS] = READ_ONCE(cnf->ndisc_tclass); 5719 array[DEVCONF_RPL_SEG_ENABLED] = READ_ONCE(cnf->rpl_seg_enabled); 5720 array[DEVCONF_IOAM6_ENABLED] = READ_ONCE(cnf->ioam6_enabled); 5721 array[DEVCONF_IOAM6_ID] = READ_ONCE(cnf->ioam6_id); 5722 array[DEVCONF_IOAM6_ID_WIDE] = READ_ONCE(cnf->ioam6_id_wide); 5723 array[DEVCONF_NDISC_EVICT_NOCARRIER] = 5724 READ_ONCE(cnf->ndisc_evict_nocarrier); 5725 array[DEVCONF_ACCEPT_UNTRACKED_NA] = 5726 READ_ONCE(cnf->accept_untracked_na); 5727 array[DEVCONF_ACCEPT_RA_MIN_LFT] = READ_ONCE(cnf->accept_ra_min_lft); 5728 } 5729 5730 static inline size_t inet6_ifla6_size(void) 5731 { 5732 return nla_total_size(4) /* IFLA_INET6_FLAGS */ 5733 + nla_total_size(sizeof(struct ifla_cacheinfo)) 5734 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */ 5735 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */ 5736 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */ 5737 + nla_total_size(sizeof(struct in6_addr)) /* IFLA_INET6_TOKEN */ 5738 + nla_total_size(1) /* IFLA_INET6_ADDR_GEN_MODE */ 5739 + nla_total_size(4) /* IFLA_INET6_RA_MTU */ 5740 + 0; 5741 } 5742 5743 static inline size_t inet6_if_nlmsg_size(void) 5744 { 5745 return NLMSG_ALIGN(sizeof(struct ifinfomsg)) 5746 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */ 5747 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */ 5748 + nla_total_size(4) /* IFLA_MTU */ 5749 + nla_total_size(4) /* IFLA_LINK */ 5750 + nla_total_size(1) /* IFLA_OPERSTATE */ 5751 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */ 5752 } 5753 5754 static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib, 5755 int bytes) 5756 { 5757 int i; 5758 int pad = bytes - sizeof(u64) * ICMP6_MIB_MAX; 5759 BUG_ON(pad < 0); 5760 5761 /* Use put_unaligned() because stats may not be aligned for u64. */ 5762 put_unaligned(ICMP6_MIB_MAX, &stats[0]); 5763 for (i = 1; i < ICMP6_MIB_MAX; i++) 5764 put_unaligned(atomic_long_read(&mib[i]), &stats[i]); 5765 5766 memset(&stats[ICMP6_MIB_MAX], 0, pad); 5767 } 5768 5769 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu *mib, 5770 int bytes, size_t syncpoff) 5771 { 5772 int i, c; 5773 u64 buff[IPSTATS_MIB_MAX]; 5774 int pad = bytes - sizeof(u64) * IPSTATS_MIB_MAX; 5775 5776 BUG_ON(pad < 0); 5777 5778 memset(buff, 0, sizeof(buff)); 5779 buff[0] = IPSTATS_MIB_MAX; 5780 5781 for_each_possible_cpu(c) { 5782 for (i = 1; i < IPSTATS_MIB_MAX; i++) 5783 buff[i] += snmp_get_cpu_field64(mib, c, i, syncpoff); 5784 } 5785 5786 memcpy(stats, buff, IPSTATS_MIB_MAX * sizeof(u64)); 5787 memset(&stats[IPSTATS_MIB_MAX], 0, pad); 5788 } 5789 5790 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype, 5791 int bytes) 5792 { 5793 switch (attrtype) { 5794 case IFLA_INET6_STATS: 5795 __snmp6_fill_stats64(stats, idev->stats.ipv6, bytes, 5796 offsetof(struct ipstats_mib, syncp)); 5797 break; 5798 case IFLA_INET6_ICMP6STATS: 5799 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, bytes); 5800 break; 5801 } 5802 } 5803 5804 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev, 5805 u32 ext_filter_mask) 5806 { 5807 struct ifla_cacheinfo ci; 5808 struct nlattr *nla; 5809 u32 ra_mtu; 5810 5811 if (nla_put_u32(skb, IFLA_INET6_FLAGS, READ_ONCE(idev->if_flags))) 5812 goto nla_put_failure; 5813 ci.max_reasm_len = IPV6_MAXPLEN; 5814 ci.tstamp = cstamp_delta(READ_ONCE(idev->tstamp)); 5815 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time); 5816 ci.retrans_time = jiffies_to_msecs(NEIGH_VAR(idev->nd_parms, RETRANS_TIME)); 5817 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci)) 5818 goto nla_put_failure; 5819 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32)); 5820 if (!nla) 5821 goto nla_put_failure; 5822 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla)); 5823 5824 /* XXX - MC not implemented */ 5825 5826 if (ext_filter_mask & RTEXT_FILTER_SKIP_STATS) 5827 return 0; 5828 5829 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64)); 5830 if (!nla) 5831 goto nla_put_failure; 5832 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla)); 5833 5834 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64)); 5835 if (!nla) 5836 goto nla_put_failure; 5837 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla)); 5838 5839 nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr)); 5840 if (!nla) 5841 goto nla_put_failure; 5842 read_lock_bh(&idev->lock); 5843 memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla)); 5844 read_unlock_bh(&idev->lock); 5845 5846 if (nla_put_u8(skb, IFLA_INET6_ADDR_GEN_MODE, 5847 READ_ONCE(idev->cnf.addr_gen_mode))) 5848 goto nla_put_failure; 5849 5850 ra_mtu = READ_ONCE(idev->ra_mtu); 5851 if (ra_mtu && nla_put_u32(skb, IFLA_INET6_RA_MTU, ra_mtu)) 5852 goto nla_put_failure; 5853 5854 return 0; 5855 5856 nla_put_failure: 5857 return -EMSGSIZE; 5858 } 5859 5860 static size_t inet6_get_link_af_size(const struct net_device *dev, 5861 u32 ext_filter_mask) 5862 { 5863 if (!__in6_dev_get(dev)) 5864 return 0; 5865 5866 return inet6_ifla6_size(); 5867 } 5868 5869 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev, 5870 u32 ext_filter_mask) 5871 { 5872 struct inet6_dev *idev = __in6_dev_get(dev); 5873 5874 if (!idev) 5875 return -ENODATA; 5876 5877 if (inet6_fill_ifla6_attrs(skb, idev, ext_filter_mask) < 0) 5878 return -EMSGSIZE; 5879 5880 return 0; 5881 } 5882 5883 static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token, 5884 struct netlink_ext_ack *extack) 5885 { 5886 struct inet6_ifaddr *ifp; 5887 struct net_device *dev = idev->dev; 5888 bool clear_token, update_rs = false; 5889 struct in6_addr ll_addr; 5890 5891 ASSERT_RTNL(); 5892 5893 if (!token) 5894 return -EINVAL; 5895 5896 if (dev->flags & IFF_LOOPBACK) { 5897 NL_SET_ERR_MSG_MOD(extack, "Device is loopback"); 5898 return -EINVAL; 5899 } 5900 5901 if (dev->flags & IFF_NOARP) { 5902 NL_SET_ERR_MSG_MOD(extack, 5903 "Device does not do neighbour discovery"); 5904 return -EINVAL; 5905 } 5906 5907 if (!ipv6_accept_ra(idev)) { 5908 NL_SET_ERR_MSG_MOD(extack, 5909 "Router advertisement is disabled on device"); 5910 return -EINVAL; 5911 } 5912 5913 if (READ_ONCE(idev->cnf.rtr_solicits) == 0) { 5914 NL_SET_ERR_MSG(extack, 5915 "Router solicitation is disabled on device"); 5916 return -EINVAL; 5917 } 5918 5919 write_lock_bh(&idev->lock); 5920 5921 BUILD_BUG_ON(sizeof(token->s6_addr) != 16); 5922 memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8); 5923 5924 write_unlock_bh(&idev->lock); 5925 5926 clear_token = ipv6_addr_any(token); 5927 if (clear_token) 5928 goto update_lft; 5929 5930 if (!idev->dead && (idev->if_flags & IF_READY) && 5931 !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE | 5932 IFA_F_OPTIMISTIC)) { 5933 /* If we're not ready, then normal ifup will take care 5934 * of this. Otherwise, we need to request our rs here. 5935 */ 5936 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters); 5937 update_rs = true; 5938 } 5939 5940 update_lft: 5941 write_lock_bh(&idev->lock); 5942 5943 if (update_rs) { 5944 idev->if_flags |= IF_RS_SENT; 5945 idev->rs_interval = rfc3315_s14_backoff_init( 5946 READ_ONCE(idev->cnf.rtr_solicit_interval)); 5947 idev->rs_probes = 1; 5948 addrconf_mod_rs_timer(idev, idev->rs_interval); 5949 } 5950 5951 /* Well, that's kinda nasty ... */ 5952 list_for_each_entry(ifp, &idev->addr_list, if_list) { 5953 spin_lock(&ifp->lock); 5954 if (ifp->tokenized) { 5955 ifp->valid_lft = 0; 5956 ifp->prefered_lft = 0; 5957 } 5958 spin_unlock(&ifp->lock); 5959 } 5960 5961 write_unlock_bh(&idev->lock); 5962 inet6_ifinfo_notify(RTM_NEWLINK, idev); 5963 addrconf_verify_rtnl(dev_net(dev)); 5964 return 0; 5965 } 5966 5967 static const struct nla_policy inet6_af_policy[IFLA_INET6_MAX + 1] = { 5968 [IFLA_INET6_ADDR_GEN_MODE] = { .type = NLA_U8 }, 5969 [IFLA_INET6_TOKEN] = { .len = sizeof(struct in6_addr) }, 5970 [IFLA_INET6_RA_MTU] = { .type = NLA_REJECT, 5971 .reject_message = 5972 "IFLA_INET6_RA_MTU can not be set" }, 5973 }; 5974 5975 static int check_addr_gen_mode(int mode) 5976 { 5977 if (mode != IN6_ADDR_GEN_MODE_EUI64 && 5978 mode != IN6_ADDR_GEN_MODE_NONE && 5979 mode != IN6_ADDR_GEN_MODE_STABLE_PRIVACY && 5980 mode != IN6_ADDR_GEN_MODE_RANDOM) 5981 return -EINVAL; 5982 return 1; 5983 } 5984 5985 static int check_stable_privacy(struct inet6_dev *idev, struct net *net, 5986 int mode) 5987 { 5988 if (mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY && 5989 !idev->cnf.stable_secret.initialized && 5990 !net->ipv6.devconf_dflt->stable_secret.initialized) 5991 return -EINVAL; 5992 return 1; 5993 } 5994 5995 static int inet6_validate_link_af(const struct net_device *dev, 5996 const struct nlattr *nla, 5997 struct netlink_ext_ack *extack) 5998 { 5999 struct nlattr *tb[IFLA_INET6_MAX + 1]; 6000 struct inet6_dev *idev = NULL; 6001 int err; 6002 6003 if (dev) { 6004 idev = __in6_dev_get(dev); 6005 if (!idev) 6006 return -EAFNOSUPPORT; 6007 } 6008 6009 err = nla_parse_nested_deprecated(tb, IFLA_INET6_MAX, nla, 6010 inet6_af_policy, extack); 6011 if (err) 6012 return err; 6013 6014 if (!tb[IFLA_INET6_TOKEN] && !tb[IFLA_INET6_ADDR_GEN_MODE]) 6015 return -EINVAL; 6016 6017 if (tb[IFLA_INET6_ADDR_GEN_MODE]) { 6018 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]); 6019 6020 if (check_addr_gen_mode(mode) < 0) 6021 return -EINVAL; 6022 if (dev && check_stable_privacy(idev, dev_net(dev), mode) < 0) 6023 return -EINVAL; 6024 } 6025 6026 return 0; 6027 } 6028 6029 static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla, 6030 struct netlink_ext_ack *extack) 6031 { 6032 struct inet6_dev *idev = __in6_dev_get(dev); 6033 struct nlattr *tb[IFLA_INET6_MAX + 1]; 6034 int err; 6035 6036 if (!idev) 6037 return -EAFNOSUPPORT; 6038 6039 if (nla_parse_nested_deprecated(tb, IFLA_INET6_MAX, nla, NULL, NULL) < 0) 6040 return -EINVAL; 6041 6042 if (tb[IFLA_INET6_TOKEN]) { 6043 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN]), 6044 extack); 6045 if (err) 6046 return err; 6047 } 6048 6049 if (tb[IFLA_INET6_ADDR_GEN_MODE]) { 6050 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]); 6051 6052 WRITE_ONCE(idev->cnf.addr_gen_mode, mode); 6053 } 6054 6055 return 0; 6056 } 6057 6058 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev, 6059 u32 portid, u32 seq, int event, unsigned int flags) 6060 { 6061 struct net_device *dev = idev->dev; 6062 struct ifinfomsg *hdr; 6063 struct nlmsghdr *nlh; 6064 int ifindex, iflink; 6065 void *protoinfo; 6066 6067 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags); 6068 if (!nlh) 6069 return -EMSGSIZE; 6070 6071 hdr = nlmsg_data(nlh); 6072 hdr->ifi_family = AF_INET6; 6073 hdr->__ifi_pad = 0; 6074 hdr->ifi_type = dev->type; 6075 ifindex = READ_ONCE(dev->ifindex); 6076 hdr->ifi_index = ifindex; 6077 hdr->ifi_flags = dev_get_flags(dev); 6078 hdr->ifi_change = 0; 6079 6080 iflink = dev_get_iflink(dev); 6081 if (nla_put_string(skb, IFLA_IFNAME, dev->name) || 6082 (dev->addr_len && 6083 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) || 6084 nla_put_u32(skb, IFLA_MTU, READ_ONCE(dev->mtu)) || 6085 (ifindex != iflink && 6086 nla_put_u32(skb, IFLA_LINK, iflink)) || 6087 nla_put_u8(skb, IFLA_OPERSTATE, 6088 netif_running(dev) ? READ_ONCE(dev->operstate) : IF_OPER_DOWN)) 6089 goto nla_put_failure; 6090 protoinfo = nla_nest_start_noflag(skb, IFLA_PROTINFO); 6091 if (!protoinfo) 6092 goto nla_put_failure; 6093 6094 if (inet6_fill_ifla6_attrs(skb, idev, 0) < 0) 6095 goto nla_put_failure; 6096 6097 nla_nest_end(skb, protoinfo); 6098 nlmsg_end(skb, nlh); 6099 return 0; 6100 6101 nla_put_failure: 6102 nlmsg_cancel(skb, nlh); 6103 return -EMSGSIZE; 6104 } 6105 6106 static int inet6_valid_dump_ifinfo(const struct nlmsghdr *nlh, 6107 struct netlink_ext_ack *extack) 6108 { 6109 struct ifinfomsg *ifm; 6110 6111 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) { 6112 NL_SET_ERR_MSG_MOD(extack, "Invalid header for link dump request"); 6113 return -EINVAL; 6114 } 6115 6116 if (nlmsg_attrlen(nlh, sizeof(*ifm))) { 6117 NL_SET_ERR_MSG_MOD(extack, "Invalid data after header"); 6118 return -EINVAL; 6119 } 6120 6121 ifm = nlmsg_data(nlh); 6122 if (ifm->__ifi_pad || ifm->ifi_type || ifm->ifi_flags || 6123 ifm->ifi_change || ifm->ifi_index) { 6124 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for dump request"); 6125 return -EINVAL; 6126 } 6127 6128 return 0; 6129 } 6130 6131 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb) 6132 { 6133 struct net *net = sock_net(skb->sk); 6134 struct { 6135 unsigned long ifindex; 6136 } *ctx = (void *)cb->ctx; 6137 struct net_device *dev; 6138 struct inet6_dev *idev; 6139 int err; 6140 6141 /* only requests using strict checking can pass data to 6142 * influence the dump 6143 */ 6144 if (cb->strict_check) { 6145 err = inet6_valid_dump_ifinfo(cb->nlh, cb->extack); 6146 6147 if (err < 0) 6148 return err; 6149 } 6150 6151 err = 0; 6152 rcu_read_lock(); 6153 for_each_netdev_dump(net, dev, ctx->ifindex) { 6154 idev = __in6_dev_get(dev); 6155 if (!idev) 6156 continue; 6157 err = inet6_fill_ifinfo(skb, idev, 6158 NETLINK_CB(cb->skb).portid, 6159 cb->nlh->nlmsg_seq, 6160 RTM_NEWLINK, NLM_F_MULTI); 6161 if (err < 0) { 6162 if (likely(skb->len)) 6163 err = skb->len; 6164 break; 6165 } 6166 } 6167 rcu_read_unlock(); 6168 6169 return err; 6170 } 6171 6172 void inet6_ifinfo_notify(int event, struct inet6_dev *idev) 6173 { 6174 struct sk_buff *skb; 6175 struct net *net = dev_net(idev->dev); 6176 int err = -ENOBUFS; 6177 6178 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC); 6179 if (!skb) 6180 goto errout; 6181 6182 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0); 6183 if (err < 0) { 6184 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */ 6185 WARN_ON(err == -EMSGSIZE); 6186 kfree_skb(skb); 6187 goto errout; 6188 } 6189 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC); 6190 return; 6191 errout: 6192 if (err < 0) 6193 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err); 6194 } 6195 6196 static inline size_t inet6_prefix_nlmsg_size(void) 6197 { 6198 return NLMSG_ALIGN(sizeof(struct prefixmsg)) 6199 + nla_total_size(sizeof(struct in6_addr)) 6200 + nla_total_size(sizeof(struct prefix_cacheinfo)); 6201 } 6202 6203 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev, 6204 struct prefix_info *pinfo, u32 portid, u32 seq, 6205 int event, unsigned int flags) 6206 { 6207 struct prefixmsg *pmsg; 6208 struct nlmsghdr *nlh; 6209 struct prefix_cacheinfo ci; 6210 6211 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags); 6212 if (!nlh) 6213 return -EMSGSIZE; 6214 6215 pmsg = nlmsg_data(nlh); 6216 pmsg->prefix_family = AF_INET6; 6217 pmsg->prefix_pad1 = 0; 6218 pmsg->prefix_pad2 = 0; 6219 pmsg->prefix_ifindex = idev->dev->ifindex; 6220 pmsg->prefix_len = pinfo->prefix_len; 6221 pmsg->prefix_type = pinfo->type; 6222 pmsg->prefix_pad3 = 0; 6223 pmsg->prefix_flags = pinfo->flags; 6224 6225 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix)) 6226 goto nla_put_failure; 6227 ci.preferred_time = ntohl(pinfo->prefered); 6228 ci.valid_time = ntohl(pinfo->valid); 6229 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci)) 6230 goto nla_put_failure; 6231 nlmsg_end(skb, nlh); 6232 return 0; 6233 6234 nla_put_failure: 6235 nlmsg_cancel(skb, nlh); 6236 return -EMSGSIZE; 6237 } 6238 6239 static void inet6_prefix_notify(int event, struct inet6_dev *idev, 6240 struct prefix_info *pinfo) 6241 { 6242 struct sk_buff *skb; 6243 struct net *net = dev_net(idev->dev); 6244 int err = -ENOBUFS; 6245 6246 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC); 6247 if (!skb) 6248 goto errout; 6249 6250 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0); 6251 if (err < 0) { 6252 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */ 6253 WARN_ON(err == -EMSGSIZE); 6254 kfree_skb(skb); 6255 goto errout; 6256 } 6257 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC); 6258 return; 6259 errout: 6260 if (err < 0) 6261 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err); 6262 } 6263 6264 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 6265 { 6266 struct net *net = dev_net(ifp->idev->dev); 6267 6268 if (event) 6269 ASSERT_RTNL(); 6270 6271 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp); 6272 6273 switch (event) { 6274 case RTM_NEWADDR: 6275 /* 6276 * If the address was optimistic we inserted the route at the 6277 * start of our DAD process, so we don't need to do it again. 6278 * If the device was taken down in the middle of the DAD 6279 * cycle there is a race where we could get here without a 6280 * host route, so nothing to insert. That will be fixed when 6281 * the device is brought up. 6282 */ 6283 if (ifp->rt && !rcu_access_pointer(ifp->rt->fib6_node)) { 6284 ip6_ins_rt(net, ifp->rt); 6285 } else if (!ifp->rt && (ifp->idev->dev->flags & IFF_UP)) { 6286 pr_warn("BUG: Address %pI6c on device %s is missing its host route.\n", 6287 &ifp->addr, ifp->idev->dev->name); 6288 } 6289 6290 if (ifp->idev->cnf.forwarding) 6291 addrconf_join_anycast(ifp); 6292 if (!ipv6_addr_any(&ifp->peer_addr)) 6293 addrconf_prefix_route(&ifp->peer_addr, 128, 6294 ifp->rt_priority, ifp->idev->dev, 6295 0, 0, GFP_ATOMIC); 6296 break; 6297 case RTM_DELADDR: 6298 if (ifp->idev->cnf.forwarding) 6299 addrconf_leave_anycast(ifp); 6300 addrconf_leave_solict(ifp->idev, &ifp->addr); 6301 if (!ipv6_addr_any(&ifp->peer_addr)) { 6302 struct fib6_info *rt; 6303 6304 rt = addrconf_get_prefix_route(&ifp->peer_addr, 128, 6305 ifp->idev->dev, 0, 0, 6306 false); 6307 if (rt) 6308 ip6_del_rt(net, rt, false); 6309 } 6310 if (ifp->rt) { 6311 ip6_del_rt(net, ifp->rt, false); 6312 ifp->rt = NULL; 6313 } 6314 rt_genid_bump_ipv6(net); 6315 break; 6316 } 6317 atomic_inc(&net->ipv6.dev_addr_genid); 6318 } 6319 6320 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 6321 { 6322 if (likely(ifp->idev->dead == 0)) 6323 __ipv6_ifa_notify(event, ifp); 6324 } 6325 6326 #ifdef CONFIG_SYSCTL 6327 6328 static int addrconf_sysctl_forward(struct ctl_table *ctl, int write, 6329 void *buffer, size_t *lenp, loff_t *ppos) 6330 { 6331 int *valp = ctl->data; 6332 int val = *valp; 6333 loff_t pos = *ppos; 6334 struct ctl_table lctl; 6335 int ret; 6336 6337 /* 6338 * ctl->data points to idev->cnf.forwarding, we should 6339 * not modify it until we get the rtnl lock. 6340 */ 6341 lctl = *ctl; 6342 lctl.data = &val; 6343 6344 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 6345 6346 if (write) 6347 ret = addrconf_fixup_forwarding(ctl, valp, val); 6348 if (ret) 6349 *ppos = pos; 6350 return ret; 6351 } 6352 6353 static int addrconf_sysctl_mtu(struct ctl_table *ctl, int write, 6354 void *buffer, size_t *lenp, loff_t *ppos) 6355 { 6356 struct inet6_dev *idev = ctl->extra1; 6357 int min_mtu = IPV6_MIN_MTU; 6358 struct ctl_table lctl; 6359 6360 lctl = *ctl; 6361 lctl.extra1 = &min_mtu; 6362 lctl.extra2 = idev ? &idev->dev->mtu : NULL; 6363 6364 return proc_dointvec_minmax(&lctl, write, buffer, lenp, ppos); 6365 } 6366 6367 static void dev_disable_change(struct inet6_dev *idev) 6368 { 6369 struct netdev_notifier_info info; 6370 6371 if (!idev || !idev->dev) 6372 return; 6373 6374 netdev_notifier_info_init(&info, idev->dev); 6375 if (idev->cnf.disable_ipv6) 6376 addrconf_notify(NULL, NETDEV_DOWN, &info); 6377 else 6378 addrconf_notify(NULL, NETDEV_UP, &info); 6379 } 6380 6381 static void addrconf_disable_change(struct net *net, __s32 newf) 6382 { 6383 struct net_device *dev; 6384 struct inet6_dev *idev; 6385 6386 for_each_netdev(net, dev) { 6387 idev = __in6_dev_get(dev); 6388 if (idev) { 6389 int changed = (!idev->cnf.disable_ipv6) ^ (!newf); 6390 6391 WRITE_ONCE(idev->cnf.disable_ipv6, newf); 6392 if (changed) 6393 dev_disable_change(idev); 6394 } 6395 } 6396 } 6397 6398 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf) 6399 { 6400 struct net *net = (struct net *)table->extra2; 6401 int old; 6402 6403 if (p == &net->ipv6.devconf_dflt->disable_ipv6) { 6404 WRITE_ONCE(*p, newf); 6405 return 0; 6406 } 6407 6408 if (!rtnl_trylock()) 6409 return restart_syscall(); 6410 6411 old = *p; 6412 WRITE_ONCE(*p, newf); 6413 6414 if (p == &net->ipv6.devconf_all->disable_ipv6) { 6415 WRITE_ONCE(net->ipv6.devconf_dflt->disable_ipv6, newf); 6416 addrconf_disable_change(net, newf); 6417 } else if ((!newf) ^ (!old)) 6418 dev_disable_change((struct inet6_dev *)table->extra1); 6419 6420 rtnl_unlock(); 6421 return 0; 6422 } 6423 6424 static int addrconf_sysctl_disable(struct ctl_table *ctl, int write, 6425 void *buffer, size_t *lenp, loff_t *ppos) 6426 { 6427 int *valp = ctl->data; 6428 int val = *valp; 6429 loff_t pos = *ppos; 6430 struct ctl_table lctl; 6431 int ret; 6432 6433 /* 6434 * ctl->data points to idev->cnf.disable_ipv6, we should 6435 * not modify it until we get the rtnl lock. 6436 */ 6437 lctl = *ctl; 6438 lctl.data = &val; 6439 6440 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 6441 6442 if (write) 6443 ret = addrconf_disable_ipv6(ctl, valp, val); 6444 if (ret) 6445 *ppos = pos; 6446 return ret; 6447 } 6448 6449 static int addrconf_sysctl_proxy_ndp(struct ctl_table *ctl, int write, 6450 void *buffer, size_t *lenp, loff_t *ppos) 6451 { 6452 int *valp = ctl->data; 6453 int ret; 6454 int old, new; 6455 6456 old = *valp; 6457 ret = proc_dointvec(ctl, write, buffer, lenp, ppos); 6458 new = *valp; 6459 6460 if (write && old != new) { 6461 struct net *net = ctl->extra2; 6462 6463 if (!rtnl_trylock()) 6464 return restart_syscall(); 6465 6466 if (valp == &net->ipv6.devconf_dflt->proxy_ndp) 6467 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 6468 NETCONFA_PROXY_NEIGH, 6469 NETCONFA_IFINDEX_DEFAULT, 6470 net->ipv6.devconf_dflt); 6471 else if (valp == &net->ipv6.devconf_all->proxy_ndp) 6472 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 6473 NETCONFA_PROXY_NEIGH, 6474 NETCONFA_IFINDEX_ALL, 6475 net->ipv6.devconf_all); 6476 else { 6477 struct inet6_dev *idev = ctl->extra1; 6478 6479 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 6480 NETCONFA_PROXY_NEIGH, 6481 idev->dev->ifindex, 6482 &idev->cnf); 6483 } 6484 rtnl_unlock(); 6485 } 6486 6487 return ret; 6488 } 6489 6490 static int addrconf_sysctl_addr_gen_mode(struct ctl_table *ctl, int write, 6491 void *buffer, size_t *lenp, 6492 loff_t *ppos) 6493 { 6494 int ret = 0; 6495 u32 new_val; 6496 struct inet6_dev *idev = (struct inet6_dev *)ctl->extra1; 6497 struct net *net = (struct net *)ctl->extra2; 6498 struct ctl_table tmp = { 6499 .data = &new_val, 6500 .maxlen = sizeof(new_val), 6501 .mode = ctl->mode, 6502 }; 6503 6504 if (!rtnl_trylock()) 6505 return restart_syscall(); 6506 6507 new_val = *((u32 *)ctl->data); 6508 6509 ret = proc_douintvec(&tmp, write, buffer, lenp, ppos); 6510 if (ret != 0) 6511 goto out; 6512 6513 if (write) { 6514 if (check_addr_gen_mode(new_val) < 0) { 6515 ret = -EINVAL; 6516 goto out; 6517 } 6518 6519 if (idev) { 6520 if (check_stable_privacy(idev, net, new_val) < 0) { 6521 ret = -EINVAL; 6522 goto out; 6523 } 6524 6525 if (idev->cnf.addr_gen_mode != new_val) { 6526 WRITE_ONCE(idev->cnf.addr_gen_mode, new_val); 6527 addrconf_init_auto_addrs(idev->dev); 6528 } 6529 } else if (&net->ipv6.devconf_all->addr_gen_mode == ctl->data) { 6530 struct net_device *dev; 6531 6532 WRITE_ONCE(net->ipv6.devconf_dflt->addr_gen_mode, new_val); 6533 for_each_netdev(net, dev) { 6534 idev = __in6_dev_get(dev); 6535 if (idev && 6536 idev->cnf.addr_gen_mode != new_val) { 6537 WRITE_ONCE(idev->cnf.addr_gen_mode, 6538 new_val); 6539 addrconf_init_auto_addrs(idev->dev); 6540 } 6541 } 6542 } 6543 6544 WRITE_ONCE(*((u32 *)ctl->data), new_val); 6545 } 6546 6547 out: 6548 rtnl_unlock(); 6549 6550 return ret; 6551 } 6552 6553 static int addrconf_sysctl_stable_secret(struct ctl_table *ctl, int write, 6554 void *buffer, size_t *lenp, 6555 loff_t *ppos) 6556 { 6557 int err; 6558 struct in6_addr addr; 6559 char str[IPV6_MAX_STRLEN]; 6560 struct ctl_table lctl = *ctl; 6561 struct net *net = ctl->extra2; 6562 struct ipv6_stable_secret *secret = ctl->data; 6563 6564 if (&net->ipv6.devconf_all->stable_secret == ctl->data) 6565 return -EIO; 6566 6567 lctl.maxlen = IPV6_MAX_STRLEN; 6568 lctl.data = str; 6569 6570 if (!rtnl_trylock()) 6571 return restart_syscall(); 6572 6573 if (!write && !secret->initialized) { 6574 err = -EIO; 6575 goto out; 6576 } 6577 6578 err = snprintf(str, sizeof(str), "%pI6", &secret->secret); 6579 if (err >= sizeof(str)) { 6580 err = -EIO; 6581 goto out; 6582 } 6583 6584 err = proc_dostring(&lctl, write, buffer, lenp, ppos); 6585 if (err || !write) 6586 goto out; 6587 6588 if (in6_pton(str, -1, addr.in6_u.u6_addr8, -1, NULL) != 1) { 6589 err = -EIO; 6590 goto out; 6591 } 6592 6593 secret->initialized = true; 6594 secret->secret = addr; 6595 6596 if (&net->ipv6.devconf_dflt->stable_secret == ctl->data) { 6597 struct net_device *dev; 6598 6599 for_each_netdev(net, dev) { 6600 struct inet6_dev *idev = __in6_dev_get(dev); 6601 6602 if (idev) { 6603 WRITE_ONCE(idev->cnf.addr_gen_mode, 6604 IN6_ADDR_GEN_MODE_STABLE_PRIVACY); 6605 } 6606 } 6607 } else { 6608 struct inet6_dev *idev = ctl->extra1; 6609 6610 WRITE_ONCE(idev->cnf.addr_gen_mode, 6611 IN6_ADDR_GEN_MODE_STABLE_PRIVACY); 6612 } 6613 6614 out: 6615 rtnl_unlock(); 6616 6617 return err; 6618 } 6619 6620 static 6621 int addrconf_sysctl_ignore_routes_with_linkdown(struct ctl_table *ctl, 6622 int write, void *buffer, 6623 size_t *lenp, 6624 loff_t *ppos) 6625 { 6626 int *valp = ctl->data; 6627 int val = *valp; 6628 loff_t pos = *ppos; 6629 struct ctl_table lctl; 6630 int ret; 6631 6632 /* ctl->data points to idev->cnf.ignore_routes_when_linkdown 6633 * we should not modify it until we get the rtnl lock. 6634 */ 6635 lctl = *ctl; 6636 lctl.data = &val; 6637 6638 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 6639 6640 if (write) 6641 ret = addrconf_fixup_linkdown(ctl, valp, val); 6642 if (ret) 6643 *ppos = pos; 6644 return ret; 6645 } 6646 6647 static 6648 void addrconf_set_nopolicy(struct rt6_info *rt, int action) 6649 { 6650 if (rt) { 6651 if (action) 6652 rt->dst.flags |= DST_NOPOLICY; 6653 else 6654 rt->dst.flags &= ~DST_NOPOLICY; 6655 } 6656 } 6657 6658 static 6659 void addrconf_disable_policy_idev(struct inet6_dev *idev, int val) 6660 { 6661 struct inet6_ifaddr *ifa; 6662 6663 read_lock_bh(&idev->lock); 6664 list_for_each_entry(ifa, &idev->addr_list, if_list) { 6665 spin_lock(&ifa->lock); 6666 if (ifa->rt) { 6667 /* host routes only use builtin fib6_nh */ 6668 struct fib6_nh *nh = ifa->rt->fib6_nh; 6669 int cpu; 6670 6671 rcu_read_lock(); 6672 ifa->rt->dst_nopolicy = val ? true : false; 6673 if (nh->rt6i_pcpu) { 6674 for_each_possible_cpu(cpu) { 6675 struct rt6_info **rtp; 6676 6677 rtp = per_cpu_ptr(nh->rt6i_pcpu, cpu); 6678 addrconf_set_nopolicy(*rtp, val); 6679 } 6680 } 6681 rcu_read_unlock(); 6682 } 6683 spin_unlock(&ifa->lock); 6684 } 6685 read_unlock_bh(&idev->lock); 6686 } 6687 6688 static 6689 int addrconf_disable_policy(struct ctl_table *ctl, int *valp, int val) 6690 { 6691 struct net *net = (struct net *)ctl->extra2; 6692 struct inet6_dev *idev; 6693 6694 if (valp == &net->ipv6.devconf_dflt->disable_policy) { 6695 WRITE_ONCE(*valp, val); 6696 return 0; 6697 } 6698 6699 if (!rtnl_trylock()) 6700 return restart_syscall(); 6701 6702 WRITE_ONCE(*valp, val); 6703 6704 if (valp == &net->ipv6.devconf_all->disable_policy) { 6705 struct net_device *dev; 6706 6707 for_each_netdev(net, dev) { 6708 idev = __in6_dev_get(dev); 6709 if (idev) 6710 addrconf_disable_policy_idev(idev, val); 6711 } 6712 } else { 6713 idev = (struct inet6_dev *)ctl->extra1; 6714 addrconf_disable_policy_idev(idev, val); 6715 } 6716 6717 rtnl_unlock(); 6718 return 0; 6719 } 6720 6721 static int addrconf_sysctl_disable_policy(struct ctl_table *ctl, int write, 6722 void *buffer, size_t *lenp, loff_t *ppos) 6723 { 6724 int *valp = ctl->data; 6725 int val = *valp; 6726 loff_t pos = *ppos; 6727 struct ctl_table lctl; 6728 int ret; 6729 6730 lctl = *ctl; 6731 lctl.data = &val; 6732 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 6733 6734 if (write && (*valp != val)) 6735 ret = addrconf_disable_policy(ctl, valp, val); 6736 6737 if (ret) 6738 *ppos = pos; 6739 6740 return ret; 6741 } 6742 6743 static int minus_one = -1; 6744 static const int two_five_five = 255; 6745 static u32 ioam6_if_id_max = U16_MAX; 6746 6747 static const struct ctl_table addrconf_sysctl[] = { 6748 { 6749 .procname = "forwarding", 6750 .data = &ipv6_devconf.forwarding, 6751 .maxlen = sizeof(int), 6752 .mode = 0644, 6753 .proc_handler = addrconf_sysctl_forward, 6754 }, 6755 { 6756 .procname = "hop_limit", 6757 .data = &ipv6_devconf.hop_limit, 6758 .maxlen = sizeof(int), 6759 .mode = 0644, 6760 .proc_handler = proc_dointvec_minmax, 6761 .extra1 = (void *)SYSCTL_ONE, 6762 .extra2 = (void *)&two_five_five, 6763 }, 6764 { 6765 .procname = "mtu", 6766 .data = &ipv6_devconf.mtu6, 6767 .maxlen = sizeof(int), 6768 .mode = 0644, 6769 .proc_handler = addrconf_sysctl_mtu, 6770 }, 6771 { 6772 .procname = "accept_ra", 6773 .data = &ipv6_devconf.accept_ra, 6774 .maxlen = sizeof(int), 6775 .mode = 0644, 6776 .proc_handler = proc_dointvec, 6777 }, 6778 { 6779 .procname = "accept_redirects", 6780 .data = &ipv6_devconf.accept_redirects, 6781 .maxlen = sizeof(int), 6782 .mode = 0644, 6783 .proc_handler = proc_dointvec, 6784 }, 6785 { 6786 .procname = "autoconf", 6787 .data = &ipv6_devconf.autoconf, 6788 .maxlen = sizeof(int), 6789 .mode = 0644, 6790 .proc_handler = proc_dointvec, 6791 }, 6792 { 6793 .procname = "dad_transmits", 6794 .data = &ipv6_devconf.dad_transmits, 6795 .maxlen = sizeof(int), 6796 .mode = 0644, 6797 .proc_handler = proc_dointvec, 6798 }, 6799 { 6800 .procname = "router_solicitations", 6801 .data = &ipv6_devconf.rtr_solicits, 6802 .maxlen = sizeof(int), 6803 .mode = 0644, 6804 .proc_handler = proc_dointvec_minmax, 6805 .extra1 = &minus_one, 6806 }, 6807 { 6808 .procname = "router_solicitation_interval", 6809 .data = &ipv6_devconf.rtr_solicit_interval, 6810 .maxlen = sizeof(int), 6811 .mode = 0644, 6812 .proc_handler = proc_dointvec_jiffies, 6813 }, 6814 { 6815 .procname = "router_solicitation_max_interval", 6816 .data = &ipv6_devconf.rtr_solicit_max_interval, 6817 .maxlen = sizeof(int), 6818 .mode = 0644, 6819 .proc_handler = proc_dointvec_jiffies, 6820 }, 6821 { 6822 .procname = "router_solicitation_delay", 6823 .data = &ipv6_devconf.rtr_solicit_delay, 6824 .maxlen = sizeof(int), 6825 .mode = 0644, 6826 .proc_handler = proc_dointvec_jiffies, 6827 }, 6828 { 6829 .procname = "force_mld_version", 6830 .data = &ipv6_devconf.force_mld_version, 6831 .maxlen = sizeof(int), 6832 .mode = 0644, 6833 .proc_handler = proc_dointvec, 6834 }, 6835 { 6836 .procname = "mldv1_unsolicited_report_interval", 6837 .data = 6838 &ipv6_devconf.mldv1_unsolicited_report_interval, 6839 .maxlen = sizeof(int), 6840 .mode = 0644, 6841 .proc_handler = proc_dointvec_ms_jiffies, 6842 }, 6843 { 6844 .procname = "mldv2_unsolicited_report_interval", 6845 .data = 6846 &ipv6_devconf.mldv2_unsolicited_report_interval, 6847 .maxlen = sizeof(int), 6848 .mode = 0644, 6849 .proc_handler = proc_dointvec_ms_jiffies, 6850 }, 6851 { 6852 .procname = "use_tempaddr", 6853 .data = &ipv6_devconf.use_tempaddr, 6854 .maxlen = sizeof(int), 6855 .mode = 0644, 6856 .proc_handler = proc_dointvec, 6857 }, 6858 { 6859 .procname = "temp_valid_lft", 6860 .data = &ipv6_devconf.temp_valid_lft, 6861 .maxlen = sizeof(int), 6862 .mode = 0644, 6863 .proc_handler = proc_dointvec, 6864 }, 6865 { 6866 .procname = "temp_prefered_lft", 6867 .data = &ipv6_devconf.temp_prefered_lft, 6868 .maxlen = sizeof(int), 6869 .mode = 0644, 6870 .proc_handler = proc_dointvec, 6871 }, 6872 { 6873 .procname = "regen_min_advance", 6874 .data = &ipv6_devconf.regen_min_advance, 6875 .maxlen = sizeof(int), 6876 .mode = 0644, 6877 .proc_handler = proc_dointvec, 6878 }, 6879 { 6880 .procname = "regen_max_retry", 6881 .data = &ipv6_devconf.regen_max_retry, 6882 .maxlen = sizeof(int), 6883 .mode = 0644, 6884 .proc_handler = proc_dointvec, 6885 }, 6886 { 6887 .procname = "max_desync_factor", 6888 .data = &ipv6_devconf.max_desync_factor, 6889 .maxlen = sizeof(int), 6890 .mode = 0644, 6891 .proc_handler = proc_dointvec, 6892 }, 6893 { 6894 .procname = "max_addresses", 6895 .data = &ipv6_devconf.max_addresses, 6896 .maxlen = sizeof(int), 6897 .mode = 0644, 6898 .proc_handler = proc_dointvec, 6899 }, 6900 { 6901 .procname = "accept_ra_defrtr", 6902 .data = &ipv6_devconf.accept_ra_defrtr, 6903 .maxlen = sizeof(int), 6904 .mode = 0644, 6905 .proc_handler = proc_dointvec, 6906 }, 6907 { 6908 .procname = "ra_defrtr_metric", 6909 .data = &ipv6_devconf.ra_defrtr_metric, 6910 .maxlen = sizeof(u32), 6911 .mode = 0644, 6912 .proc_handler = proc_douintvec_minmax, 6913 .extra1 = (void *)SYSCTL_ONE, 6914 }, 6915 { 6916 .procname = "accept_ra_min_hop_limit", 6917 .data = &ipv6_devconf.accept_ra_min_hop_limit, 6918 .maxlen = sizeof(int), 6919 .mode = 0644, 6920 .proc_handler = proc_dointvec, 6921 }, 6922 { 6923 .procname = "accept_ra_min_lft", 6924 .data = &ipv6_devconf.accept_ra_min_lft, 6925 .maxlen = sizeof(int), 6926 .mode = 0644, 6927 .proc_handler = proc_dointvec, 6928 }, 6929 { 6930 .procname = "accept_ra_pinfo", 6931 .data = &ipv6_devconf.accept_ra_pinfo, 6932 .maxlen = sizeof(int), 6933 .mode = 0644, 6934 .proc_handler = proc_dointvec, 6935 }, 6936 { 6937 .procname = "ra_honor_pio_life", 6938 .data = &ipv6_devconf.ra_honor_pio_life, 6939 .maxlen = sizeof(u8), 6940 .mode = 0644, 6941 .proc_handler = proc_dou8vec_minmax, 6942 .extra1 = SYSCTL_ZERO, 6943 .extra2 = SYSCTL_ONE, 6944 }, 6945 #ifdef CONFIG_IPV6_ROUTER_PREF 6946 { 6947 .procname = "accept_ra_rtr_pref", 6948 .data = &ipv6_devconf.accept_ra_rtr_pref, 6949 .maxlen = sizeof(int), 6950 .mode = 0644, 6951 .proc_handler = proc_dointvec, 6952 }, 6953 { 6954 .procname = "router_probe_interval", 6955 .data = &ipv6_devconf.rtr_probe_interval, 6956 .maxlen = sizeof(int), 6957 .mode = 0644, 6958 .proc_handler = proc_dointvec_jiffies, 6959 }, 6960 #ifdef CONFIG_IPV6_ROUTE_INFO 6961 { 6962 .procname = "accept_ra_rt_info_min_plen", 6963 .data = &ipv6_devconf.accept_ra_rt_info_min_plen, 6964 .maxlen = sizeof(int), 6965 .mode = 0644, 6966 .proc_handler = proc_dointvec, 6967 }, 6968 { 6969 .procname = "accept_ra_rt_info_max_plen", 6970 .data = &ipv6_devconf.accept_ra_rt_info_max_plen, 6971 .maxlen = sizeof(int), 6972 .mode = 0644, 6973 .proc_handler = proc_dointvec, 6974 }, 6975 #endif 6976 #endif 6977 { 6978 .procname = "proxy_ndp", 6979 .data = &ipv6_devconf.proxy_ndp, 6980 .maxlen = sizeof(int), 6981 .mode = 0644, 6982 .proc_handler = addrconf_sysctl_proxy_ndp, 6983 }, 6984 { 6985 .procname = "accept_source_route", 6986 .data = &ipv6_devconf.accept_source_route, 6987 .maxlen = sizeof(int), 6988 .mode = 0644, 6989 .proc_handler = proc_dointvec, 6990 }, 6991 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 6992 { 6993 .procname = "optimistic_dad", 6994 .data = &ipv6_devconf.optimistic_dad, 6995 .maxlen = sizeof(int), 6996 .mode = 0644, 6997 .proc_handler = proc_dointvec, 6998 }, 6999 { 7000 .procname = "use_optimistic", 7001 .data = &ipv6_devconf.use_optimistic, 7002 .maxlen = sizeof(int), 7003 .mode = 0644, 7004 .proc_handler = proc_dointvec, 7005 }, 7006 #endif 7007 #ifdef CONFIG_IPV6_MROUTE 7008 { 7009 .procname = "mc_forwarding", 7010 .data = &ipv6_devconf.mc_forwarding, 7011 .maxlen = sizeof(int), 7012 .mode = 0444, 7013 .proc_handler = proc_dointvec, 7014 }, 7015 #endif 7016 { 7017 .procname = "disable_ipv6", 7018 .data = &ipv6_devconf.disable_ipv6, 7019 .maxlen = sizeof(int), 7020 .mode = 0644, 7021 .proc_handler = addrconf_sysctl_disable, 7022 }, 7023 { 7024 .procname = "accept_dad", 7025 .data = &ipv6_devconf.accept_dad, 7026 .maxlen = sizeof(int), 7027 .mode = 0644, 7028 .proc_handler = proc_dointvec, 7029 }, 7030 { 7031 .procname = "force_tllao", 7032 .data = &ipv6_devconf.force_tllao, 7033 .maxlen = sizeof(int), 7034 .mode = 0644, 7035 .proc_handler = proc_dointvec 7036 }, 7037 { 7038 .procname = "ndisc_notify", 7039 .data = &ipv6_devconf.ndisc_notify, 7040 .maxlen = sizeof(int), 7041 .mode = 0644, 7042 .proc_handler = proc_dointvec 7043 }, 7044 { 7045 .procname = "suppress_frag_ndisc", 7046 .data = &ipv6_devconf.suppress_frag_ndisc, 7047 .maxlen = sizeof(int), 7048 .mode = 0644, 7049 .proc_handler = proc_dointvec 7050 }, 7051 { 7052 .procname = "accept_ra_from_local", 7053 .data = &ipv6_devconf.accept_ra_from_local, 7054 .maxlen = sizeof(int), 7055 .mode = 0644, 7056 .proc_handler = proc_dointvec, 7057 }, 7058 { 7059 .procname = "accept_ra_mtu", 7060 .data = &ipv6_devconf.accept_ra_mtu, 7061 .maxlen = sizeof(int), 7062 .mode = 0644, 7063 .proc_handler = proc_dointvec, 7064 }, 7065 { 7066 .procname = "stable_secret", 7067 .data = &ipv6_devconf.stable_secret, 7068 .maxlen = IPV6_MAX_STRLEN, 7069 .mode = 0600, 7070 .proc_handler = addrconf_sysctl_stable_secret, 7071 }, 7072 { 7073 .procname = "use_oif_addrs_only", 7074 .data = &ipv6_devconf.use_oif_addrs_only, 7075 .maxlen = sizeof(int), 7076 .mode = 0644, 7077 .proc_handler = proc_dointvec, 7078 }, 7079 { 7080 .procname = "ignore_routes_with_linkdown", 7081 .data = &ipv6_devconf.ignore_routes_with_linkdown, 7082 .maxlen = sizeof(int), 7083 .mode = 0644, 7084 .proc_handler = addrconf_sysctl_ignore_routes_with_linkdown, 7085 }, 7086 { 7087 .procname = "drop_unicast_in_l2_multicast", 7088 .data = &ipv6_devconf.drop_unicast_in_l2_multicast, 7089 .maxlen = sizeof(int), 7090 .mode = 0644, 7091 .proc_handler = proc_dointvec, 7092 }, 7093 { 7094 .procname = "drop_unsolicited_na", 7095 .data = &ipv6_devconf.drop_unsolicited_na, 7096 .maxlen = sizeof(int), 7097 .mode = 0644, 7098 .proc_handler = proc_dointvec, 7099 }, 7100 { 7101 .procname = "keep_addr_on_down", 7102 .data = &ipv6_devconf.keep_addr_on_down, 7103 .maxlen = sizeof(int), 7104 .mode = 0644, 7105 .proc_handler = proc_dointvec, 7106 7107 }, 7108 { 7109 .procname = "seg6_enabled", 7110 .data = &ipv6_devconf.seg6_enabled, 7111 .maxlen = sizeof(int), 7112 .mode = 0644, 7113 .proc_handler = proc_dointvec, 7114 }, 7115 #ifdef CONFIG_IPV6_SEG6_HMAC 7116 { 7117 .procname = "seg6_require_hmac", 7118 .data = &ipv6_devconf.seg6_require_hmac, 7119 .maxlen = sizeof(int), 7120 .mode = 0644, 7121 .proc_handler = proc_dointvec, 7122 }, 7123 #endif 7124 { 7125 .procname = "enhanced_dad", 7126 .data = &ipv6_devconf.enhanced_dad, 7127 .maxlen = sizeof(int), 7128 .mode = 0644, 7129 .proc_handler = proc_dointvec, 7130 }, 7131 { 7132 .procname = "addr_gen_mode", 7133 .data = &ipv6_devconf.addr_gen_mode, 7134 .maxlen = sizeof(int), 7135 .mode = 0644, 7136 .proc_handler = addrconf_sysctl_addr_gen_mode, 7137 }, 7138 { 7139 .procname = "disable_policy", 7140 .data = &ipv6_devconf.disable_policy, 7141 .maxlen = sizeof(int), 7142 .mode = 0644, 7143 .proc_handler = addrconf_sysctl_disable_policy, 7144 }, 7145 { 7146 .procname = "ndisc_tclass", 7147 .data = &ipv6_devconf.ndisc_tclass, 7148 .maxlen = sizeof(int), 7149 .mode = 0644, 7150 .proc_handler = proc_dointvec_minmax, 7151 .extra1 = (void *)SYSCTL_ZERO, 7152 .extra2 = (void *)&two_five_five, 7153 }, 7154 { 7155 .procname = "rpl_seg_enabled", 7156 .data = &ipv6_devconf.rpl_seg_enabled, 7157 .maxlen = sizeof(int), 7158 .mode = 0644, 7159 .proc_handler = proc_dointvec, 7160 }, 7161 { 7162 .procname = "ioam6_enabled", 7163 .data = &ipv6_devconf.ioam6_enabled, 7164 .maxlen = sizeof(u8), 7165 .mode = 0644, 7166 .proc_handler = proc_dou8vec_minmax, 7167 .extra1 = (void *)SYSCTL_ZERO, 7168 .extra2 = (void *)SYSCTL_ONE, 7169 }, 7170 { 7171 .procname = "ioam6_id", 7172 .data = &ipv6_devconf.ioam6_id, 7173 .maxlen = sizeof(u32), 7174 .mode = 0644, 7175 .proc_handler = proc_douintvec_minmax, 7176 .extra1 = (void *)SYSCTL_ZERO, 7177 .extra2 = (void *)&ioam6_if_id_max, 7178 }, 7179 { 7180 .procname = "ioam6_id_wide", 7181 .data = &ipv6_devconf.ioam6_id_wide, 7182 .maxlen = sizeof(u32), 7183 .mode = 0644, 7184 .proc_handler = proc_douintvec, 7185 }, 7186 { 7187 .procname = "ndisc_evict_nocarrier", 7188 .data = &ipv6_devconf.ndisc_evict_nocarrier, 7189 .maxlen = sizeof(u8), 7190 .mode = 0644, 7191 .proc_handler = proc_dou8vec_minmax, 7192 .extra1 = (void *)SYSCTL_ZERO, 7193 .extra2 = (void *)SYSCTL_ONE, 7194 }, 7195 { 7196 .procname = "accept_untracked_na", 7197 .data = &ipv6_devconf.accept_untracked_na, 7198 .maxlen = sizeof(int), 7199 .mode = 0644, 7200 .proc_handler = proc_dointvec_minmax, 7201 .extra1 = SYSCTL_ZERO, 7202 .extra2 = SYSCTL_TWO, 7203 }, 7204 { 7205 /* sentinel */ 7206 } 7207 }; 7208 7209 static int __addrconf_sysctl_register(struct net *net, char *dev_name, 7210 struct inet6_dev *idev, struct ipv6_devconf *p) 7211 { 7212 int i, ifindex; 7213 struct ctl_table *table; 7214 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ]; 7215 7216 table = kmemdup(addrconf_sysctl, sizeof(addrconf_sysctl), GFP_KERNEL_ACCOUNT); 7217 if (!table) 7218 goto out; 7219 7220 for (i = 0; table[i].data; i++) { 7221 table[i].data += (char *)p - (char *)&ipv6_devconf; 7222 /* If one of these is already set, then it is not safe to 7223 * overwrite either of them: this makes proc_dointvec_minmax 7224 * usable. 7225 */ 7226 if (!table[i].extra1 && !table[i].extra2) { 7227 table[i].extra1 = idev; /* embedded; no ref */ 7228 table[i].extra2 = net; 7229 } 7230 } 7231 7232 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name); 7233 7234 p->sysctl_header = register_net_sysctl_sz(net, path, table, 7235 ARRAY_SIZE(addrconf_sysctl)); 7236 if (!p->sysctl_header) 7237 goto free; 7238 7239 if (!strcmp(dev_name, "all")) 7240 ifindex = NETCONFA_IFINDEX_ALL; 7241 else if (!strcmp(dev_name, "default")) 7242 ifindex = NETCONFA_IFINDEX_DEFAULT; 7243 else 7244 ifindex = idev->dev->ifindex; 7245 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, NETCONFA_ALL, 7246 ifindex, p); 7247 return 0; 7248 7249 free: 7250 kfree(table); 7251 out: 7252 return -ENOBUFS; 7253 } 7254 7255 static void __addrconf_sysctl_unregister(struct net *net, 7256 struct ipv6_devconf *p, int ifindex) 7257 { 7258 struct ctl_table *table; 7259 7260 if (!p->sysctl_header) 7261 return; 7262 7263 table = p->sysctl_header->ctl_table_arg; 7264 unregister_net_sysctl_table(p->sysctl_header); 7265 p->sysctl_header = NULL; 7266 kfree(table); 7267 7268 inet6_netconf_notify_devconf(net, RTM_DELNETCONF, 0, ifindex, NULL); 7269 } 7270 7271 static int addrconf_sysctl_register(struct inet6_dev *idev) 7272 { 7273 int err; 7274 7275 if (!sysctl_dev_name_is_allowed(idev->dev->name)) 7276 return -EINVAL; 7277 7278 err = neigh_sysctl_register(idev->dev, idev->nd_parms, 7279 &ndisc_ifinfo_sysctl_change); 7280 if (err) 7281 return err; 7282 err = __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name, 7283 idev, &idev->cnf); 7284 if (err) 7285 neigh_sysctl_unregister(idev->nd_parms); 7286 7287 return err; 7288 } 7289 7290 static void addrconf_sysctl_unregister(struct inet6_dev *idev) 7291 { 7292 __addrconf_sysctl_unregister(dev_net(idev->dev), &idev->cnf, 7293 idev->dev->ifindex); 7294 neigh_sysctl_unregister(idev->nd_parms); 7295 } 7296 7297 7298 #endif 7299 7300 static int __net_init addrconf_init_net(struct net *net) 7301 { 7302 int err = -ENOMEM; 7303 struct ipv6_devconf *all, *dflt; 7304 7305 spin_lock_init(&net->ipv6.addrconf_hash_lock); 7306 INIT_DEFERRABLE_WORK(&net->ipv6.addr_chk_work, addrconf_verify_work); 7307 net->ipv6.inet6_addr_lst = kcalloc(IN6_ADDR_HSIZE, 7308 sizeof(struct hlist_head), 7309 GFP_KERNEL); 7310 if (!net->ipv6.inet6_addr_lst) 7311 goto err_alloc_addr; 7312 7313 all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL); 7314 if (!all) 7315 goto err_alloc_all; 7316 7317 dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL); 7318 if (!dflt) 7319 goto err_alloc_dflt; 7320 7321 if (!net_eq(net, &init_net)) { 7322 switch (net_inherit_devconf()) { 7323 case 1: /* copy from init_net */ 7324 memcpy(all, init_net.ipv6.devconf_all, 7325 sizeof(ipv6_devconf)); 7326 memcpy(dflt, init_net.ipv6.devconf_dflt, 7327 sizeof(ipv6_devconf_dflt)); 7328 break; 7329 case 3: /* copy from the current netns */ 7330 memcpy(all, current->nsproxy->net_ns->ipv6.devconf_all, 7331 sizeof(ipv6_devconf)); 7332 memcpy(dflt, 7333 current->nsproxy->net_ns->ipv6.devconf_dflt, 7334 sizeof(ipv6_devconf_dflt)); 7335 break; 7336 case 0: 7337 case 2: 7338 /* use compiled values */ 7339 break; 7340 } 7341 } 7342 7343 /* these will be inherited by all namespaces */ 7344 dflt->autoconf = ipv6_defaults.autoconf; 7345 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6; 7346 7347 dflt->stable_secret.initialized = false; 7348 all->stable_secret.initialized = false; 7349 7350 net->ipv6.devconf_all = all; 7351 net->ipv6.devconf_dflt = dflt; 7352 7353 #ifdef CONFIG_SYSCTL 7354 err = __addrconf_sysctl_register(net, "all", NULL, all); 7355 if (err < 0) 7356 goto err_reg_all; 7357 7358 err = __addrconf_sysctl_register(net, "default", NULL, dflt); 7359 if (err < 0) 7360 goto err_reg_dflt; 7361 #endif 7362 return 0; 7363 7364 #ifdef CONFIG_SYSCTL 7365 err_reg_dflt: 7366 __addrconf_sysctl_unregister(net, all, NETCONFA_IFINDEX_ALL); 7367 err_reg_all: 7368 kfree(dflt); 7369 net->ipv6.devconf_dflt = NULL; 7370 #endif 7371 err_alloc_dflt: 7372 kfree(all); 7373 net->ipv6.devconf_all = NULL; 7374 err_alloc_all: 7375 kfree(net->ipv6.inet6_addr_lst); 7376 err_alloc_addr: 7377 return err; 7378 } 7379 7380 static void __net_exit addrconf_exit_net(struct net *net) 7381 { 7382 int i; 7383 7384 #ifdef CONFIG_SYSCTL 7385 __addrconf_sysctl_unregister(net, net->ipv6.devconf_dflt, 7386 NETCONFA_IFINDEX_DEFAULT); 7387 __addrconf_sysctl_unregister(net, net->ipv6.devconf_all, 7388 NETCONFA_IFINDEX_ALL); 7389 #endif 7390 kfree(net->ipv6.devconf_dflt); 7391 net->ipv6.devconf_dflt = NULL; 7392 kfree(net->ipv6.devconf_all); 7393 net->ipv6.devconf_all = NULL; 7394 7395 cancel_delayed_work_sync(&net->ipv6.addr_chk_work); 7396 /* 7397 * Check hash table, then free it. 7398 */ 7399 for (i = 0; i < IN6_ADDR_HSIZE; i++) 7400 WARN_ON_ONCE(!hlist_empty(&net->ipv6.inet6_addr_lst[i])); 7401 7402 kfree(net->ipv6.inet6_addr_lst); 7403 net->ipv6.inet6_addr_lst = NULL; 7404 } 7405 7406 static struct pernet_operations addrconf_ops = { 7407 .init = addrconf_init_net, 7408 .exit = addrconf_exit_net, 7409 }; 7410 7411 static struct rtnl_af_ops inet6_ops __read_mostly = { 7412 .family = AF_INET6, 7413 .fill_link_af = inet6_fill_link_af, 7414 .get_link_af_size = inet6_get_link_af_size, 7415 .validate_link_af = inet6_validate_link_af, 7416 .set_link_af = inet6_set_link_af, 7417 }; 7418 7419 /* 7420 * Init / cleanup code 7421 */ 7422 7423 int __init addrconf_init(void) 7424 { 7425 struct inet6_dev *idev; 7426 int err; 7427 7428 err = ipv6_addr_label_init(); 7429 if (err < 0) { 7430 pr_crit("%s: cannot initialize default policy table: %d\n", 7431 __func__, err); 7432 goto out; 7433 } 7434 7435 err = register_pernet_subsys(&addrconf_ops); 7436 if (err < 0) 7437 goto out_addrlabel; 7438 7439 /* All works using addrconf_wq need to lock rtnl. */ 7440 addrconf_wq = create_singlethread_workqueue("ipv6_addrconf"); 7441 if (!addrconf_wq) { 7442 err = -ENOMEM; 7443 goto out_nowq; 7444 } 7445 7446 rtnl_lock(); 7447 idev = ipv6_add_dev(blackhole_netdev); 7448 rtnl_unlock(); 7449 if (IS_ERR(idev)) { 7450 err = PTR_ERR(idev); 7451 goto errlo; 7452 } 7453 7454 ip6_route_init_special_entries(); 7455 7456 register_netdevice_notifier(&ipv6_dev_notf); 7457 7458 addrconf_verify(&init_net); 7459 7460 rtnl_af_register(&inet6_ops); 7461 7462 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETLINK, 7463 NULL, inet6_dump_ifinfo, RTNL_FLAG_DUMP_UNLOCKED); 7464 if (err < 0) 7465 goto errout; 7466 7467 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_NEWADDR, 7468 inet6_rtm_newaddr, NULL, 0); 7469 if (err < 0) 7470 goto errout; 7471 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_DELADDR, 7472 inet6_rtm_deladdr, NULL, 0); 7473 if (err < 0) 7474 goto errout; 7475 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETADDR, 7476 inet6_rtm_getaddr, inet6_dump_ifaddr, 7477 RTNL_FLAG_DOIT_UNLOCKED); 7478 if (err < 0) 7479 goto errout; 7480 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETMULTICAST, 7481 NULL, inet6_dump_ifmcaddr, 0); 7482 if (err < 0) 7483 goto errout; 7484 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETANYCAST, 7485 NULL, inet6_dump_ifacaddr, 0); 7486 if (err < 0) 7487 goto errout; 7488 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETNETCONF, 7489 inet6_netconf_get_devconf, 7490 inet6_netconf_dump_devconf, 7491 RTNL_FLAG_DOIT_UNLOCKED | 7492 RTNL_FLAG_DUMP_UNLOCKED); 7493 if (err < 0) 7494 goto errout; 7495 err = ipv6_addr_label_rtnl_register(); 7496 if (err < 0) 7497 goto errout; 7498 7499 return 0; 7500 errout: 7501 rtnl_unregister_all(PF_INET6); 7502 rtnl_af_unregister(&inet6_ops); 7503 unregister_netdevice_notifier(&ipv6_dev_notf); 7504 errlo: 7505 destroy_workqueue(addrconf_wq); 7506 out_nowq: 7507 unregister_pernet_subsys(&addrconf_ops); 7508 out_addrlabel: 7509 ipv6_addr_label_cleanup(); 7510 out: 7511 return err; 7512 } 7513 7514 void addrconf_cleanup(void) 7515 { 7516 struct net_device *dev; 7517 7518 unregister_netdevice_notifier(&ipv6_dev_notf); 7519 unregister_pernet_subsys(&addrconf_ops); 7520 ipv6_addr_label_cleanup(); 7521 7522 rtnl_af_unregister(&inet6_ops); 7523 7524 rtnl_lock(); 7525 7526 /* clean dev list */ 7527 for_each_netdev(&init_net, dev) { 7528 if (__in6_dev_get(dev) == NULL) 7529 continue; 7530 addrconf_ifdown(dev, true); 7531 } 7532 addrconf_ifdown(init_net.loopback_dev, true); 7533 7534 rtnl_unlock(); 7535 7536 destroy_workqueue(addrconf_wq); 7537 } 7538