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