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/ip_tunnels.h> 67#include <net/net_namespace.h> 68#include <net/sock.h> 69#include <net/snmp.h> 70 71#include <net/6lowpan.h> 72#include <net/firewire.h> 73#include <net/ipv6.h> 74#include <net/protocol.h> 75#include <net/ndisc.h> 76#include <net/ip6_route.h> 77#include <net/addrconf.h> 78#include <net/tcp.h> 79#include <net/ip.h> 80#include <net/netlink.h> 81#include <net/pkt_sched.h> 82#include <net/l3mdev.h> 83#include <linux/if_tunnel.h> 84#include <linux/rtnetlink.h> 85#include <linux/netconf.h> 86#include <linux/random.h> 87#include <linux/uaccess.h> 88#include <asm/unaligned.h> 89 90#include <linux/proc_fs.h> 91#include <linux/seq_file.h> 92#include <linux/export.h> 93#include <linux/ioam6.h> 94 95#define INFINITY_LIFE_TIME 0xFFFFFFFF 96 97#define IPV6_MAX_STRLEN \ 98 sizeof("ffff:ffff:ffff:ffff:ffff:ffff:255.255.255.255") 99 100static inline u32 cstamp_delta(unsigned long cstamp) 101{ 102 return (cstamp - INITIAL_JIFFIES) * 100UL / HZ; 103} 104 105static inline s32 rfc3315_s14_backoff_init(s32 irt) 106{ 107 /* multiply 'initial retransmission time' by 0.9 .. 1.1 */ 108 u64 tmp = get_random_u32_inclusive(900000, 1100000) * (u64)irt; 109 do_div(tmp, 1000000); 110 return (s32)tmp; 111} 112 113static inline s32 rfc3315_s14_backoff_update(s32 rt, s32 mrt) 114{ 115 /* multiply 'retransmission timeout' by 1.9 .. 2.1 */ 116 u64 tmp = get_random_u32_inclusive(1900000, 2100000) * (u64)rt; 117 do_div(tmp, 1000000); 118 if ((s32)tmp > mrt) { 119 /* multiply 'maximum retransmission time' by 0.9 .. 1.1 */ 120 tmp = get_random_u32_inclusive(900000, 1100000) * (u64)mrt; 121 do_div(tmp, 1000000); 122 } 123 return (s32)tmp; 124} 125 126#ifdef CONFIG_SYSCTL 127static int addrconf_sysctl_register(struct inet6_dev *idev); 128static void addrconf_sysctl_unregister(struct inet6_dev *idev); 129#else 130static inline int addrconf_sysctl_register(struct inet6_dev *idev) 131{ 132 return 0; 133} 134 135static inline void addrconf_sysctl_unregister(struct inet6_dev *idev) 136{ 137} 138#endif 139 140static void ipv6_gen_rnd_iid(struct in6_addr *addr); 141 142static int ipv6_generate_eui64(u8 *eui, struct net_device *dev); 143static int ipv6_count_addresses(const struct inet6_dev *idev); 144static int ipv6_generate_stable_address(struct in6_addr *addr, 145 u8 dad_count, 146 const struct inet6_dev *idev); 147 148#define IN6_ADDR_HSIZE_SHIFT 8 149#define IN6_ADDR_HSIZE (1 << IN6_ADDR_HSIZE_SHIFT) 150 151static void addrconf_verify(struct net *net); 152static void addrconf_verify_rtnl(struct net *net); 153 154static struct workqueue_struct *addrconf_wq; 155 156static void addrconf_join_anycast(struct inet6_ifaddr *ifp); 157static void addrconf_leave_anycast(struct inet6_ifaddr *ifp); 158 159static void addrconf_type_change(struct net_device *dev, 160 unsigned long event); 161static int addrconf_ifdown(struct net_device *dev, bool unregister); 162 163static struct fib6_info *addrconf_get_prefix_route(const struct in6_addr *pfx, 164 int plen, 165 const struct net_device *dev, 166 u32 flags, u32 noflags, 167 bool no_gw); 168 169static void addrconf_dad_start(struct inet6_ifaddr *ifp); 170static void addrconf_dad_work(struct work_struct *w); 171static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id, 172 bool send_na); 173static void addrconf_dad_run(struct inet6_dev *idev, bool restart); 174static void addrconf_rs_timer(struct timer_list *t); 175static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa); 176static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa); 177 178static void inet6_prefix_notify(int event, struct inet6_dev *idev, 179 struct prefix_info *pinfo); 180 181static struct ipv6_devconf ipv6_devconf __read_mostly = { 182 .forwarding = 0, 183 .hop_limit = IPV6_DEFAULT_HOPLIMIT, 184 .mtu6 = IPV6_MIN_MTU, 185 .accept_ra = 1, 186 .accept_redirects = 1, 187 .autoconf = 1, 188 .force_mld_version = 0, 189 .mldv1_unsolicited_report_interval = 10 * HZ, 190 .mldv2_unsolicited_report_interval = HZ, 191 .dad_transmits = 1, 192 .rtr_solicits = MAX_RTR_SOLICITATIONS, 193 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL, 194 .rtr_solicit_max_interval = RTR_SOLICITATION_MAX_INTERVAL, 195 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY, 196 .use_tempaddr = 0, 197 .temp_valid_lft = TEMP_VALID_LIFETIME, 198 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME, 199 .regen_min_advance = REGEN_MIN_ADVANCE, 200 .regen_max_retry = REGEN_MAX_RETRY, 201 .max_desync_factor = MAX_DESYNC_FACTOR, 202 .max_addresses = IPV6_MAX_ADDRESSES, 203 .accept_ra_defrtr = 1, 204 .ra_defrtr_metric = IP6_RT_PRIO_USER, 205 .accept_ra_from_local = 0, 206 .accept_ra_min_hop_limit= 1, 207 .accept_ra_min_lft = 0, 208 .accept_ra_pinfo = 1, 209#ifdef CONFIG_IPV6_ROUTER_PREF 210 .accept_ra_rtr_pref = 1, 211 .rtr_probe_interval = 60 * HZ, 212#ifdef CONFIG_IPV6_ROUTE_INFO 213 .accept_ra_rt_info_min_plen = 0, 214 .accept_ra_rt_info_max_plen = 0, 215#endif 216#endif 217 .proxy_ndp = 0, 218 .accept_source_route = 0, /* we do not accept RH0 by default. */ 219 .disable_ipv6 = 0, 220 .accept_dad = 0, 221 .suppress_frag_ndisc = 1, 222 .accept_ra_mtu = 1, 223 .stable_secret = { 224 .initialized = false, 225 }, 226 .use_oif_addrs_only = 0, 227 .ignore_routes_with_linkdown = 0, 228 .keep_addr_on_down = 0, 229 .seg6_enabled = 0, 230#ifdef CONFIG_IPV6_SEG6_HMAC 231 .seg6_require_hmac = 0, 232#endif 233 .enhanced_dad = 1, 234 .addr_gen_mode = IN6_ADDR_GEN_MODE_EUI64, 235 .disable_policy = 0, 236 .rpl_seg_enabled = 0, 237 .ioam6_enabled = 0, 238 .ioam6_id = IOAM6_DEFAULT_IF_ID, 239 .ioam6_id_wide = IOAM6_DEFAULT_IF_ID_WIDE, 240 .ndisc_evict_nocarrier = 1, 241 .ra_honor_pio_life = 0, 242}; 243 244static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = { 245 .forwarding = 0, 246 .hop_limit = IPV6_DEFAULT_HOPLIMIT, 247 .mtu6 = IPV6_MIN_MTU, 248 .accept_ra = 1, 249 .accept_redirects = 1, 250 .autoconf = 1, 251 .force_mld_version = 0, 252 .mldv1_unsolicited_report_interval = 10 * HZ, 253 .mldv2_unsolicited_report_interval = HZ, 254 .dad_transmits = 1, 255 .rtr_solicits = MAX_RTR_SOLICITATIONS, 256 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL, 257 .rtr_solicit_max_interval = RTR_SOLICITATION_MAX_INTERVAL, 258 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY, 259 .use_tempaddr = 0, 260 .temp_valid_lft = TEMP_VALID_LIFETIME, 261 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME, 262 .regen_min_advance = REGEN_MIN_ADVANCE, 263 .regen_max_retry = REGEN_MAX_RETRY, 264 .max_desync_factor = MAX_DESYNC_FACTOR, 265 .max_addresses = IPV6_MAX_ADDRESSES, 266 .accept_ra_defrtr = 1, 267 .ra_defrtr_metric = IP6_RT_PRIO_USER, 268 .accept_ra_from_local = 0, 269 .accept_ra_min_hop_limit= 1, 270 .accept_ra_min_lft = 0, 271 .accept_ra_pinfo = 1, 272#ifdef CONFIG_IPV6_ROUTER_PREF 273 .accept_ra_rtr_pref = 1, 274 .rtr_probe_interval = 60 * HZ, 275#ifdef CONFIG_IPV6_ROUTE_INFO 276 .accept_ra_rt_info_min_plen = 0, 277 .accept_ra_rt_info_max_plen = 0, 278#endif 279#endif 280 .proxy_ndp = 0, 281 .accept_source_route = 0, /* we do not accept RH0 by default. */ 282 .disable_ipv6 = 0, 283 .accept_dad = 1, 284 .suppress_frag_ndisc = 1, 285 .accept_ra_mtu = 1, 286 .stable_secret = { 287 .initialized = false, 288 }, 289 .use_oif_addrs_only = 0, 290 .ignore_routes_with_linkdown = 0, 291 .keep_addr_on_down = 0, 292 .seg6_enabled = 0, 293#ifdef CONFIG_IPV6_SEG6_HMAC 294 .seg6_require_hmac = 0, 295#endif 296 .enhanced_dad = 1, 297 .addr_gen_mode = IN6_ADDR_GEN_MODE_EUI64, 298 .disable_policy = 0, 299 .rpl_seg_enabled = 0, 300 .ioam6_enabled = 0, 301 .ioam6_id = IOAM6_DEFAULT_IF_ID, 302 .ioam6_id_wide = IOAM6_DEFAULT_IF_ID_WIDE, 303 .ndisc_evict_nocarrier = 1, 304 .ra_honor_pio_life = 0, 305}; 306 307/* Check if link is ready: is it up and is a valid qdisc available */ 308static inline bool addrconf_link_ready(const struct net_device *dev) 309{ 310 return netif_oper_up(dev) && !qdisc_tx_is_noop(dev); 311} 312 313static void addrconf_del_rs_timer(struct inet6_dev *idev) 314{ 315 if (del_timer(&idev->rs_timer)) 316 __in6_dev_put(idev); 317} 318 319static void addrconf_del_dad_work(struct inet6_ifaddr *ifp) 320{ 321 if (cancel_delayed_work(&ifp->dad_work)) 322 __in6_ifa_put(ifp); 323} 324 325static void addrconf_mod_rs_timer(struct inet6_dev *idev, 326 unsigned long when) 327{ 328 if (!mod_timer(&idev->rs_timer, jiffies + when)) 329 in6_dev_hold(idev); 330} 331 332static void addrconf_mod_dad_work(struct inet6_ifaddr *ifp, 333 unsigned long delay) 334{ 335 in6_ifa_hold(ifp); 336 if (mod_delayed_work(addrconf_wq, &ifp->dad_work, delay)) 337 in6_ifa_put(ifp); 338} 339 340static int snmp6_alloc_dev(struct inet6_dev *idev) 341{ 342 int i; 343 344 idev->stats.ipv6 = alloc_percpu_gfp(struct ipstats_mib, GFP_KERNEL_ACCOUNT); 345 if (!idev->stats.ipv6) 346 goto err_ip; 347 348 for_each_possible_cpu(i) { 349 struct ipstats_mib *addrconf_stats; 350 addrconf_stats = per_cpu_ptr(idev->stats.ipv6, i); 351 u64_stats_init(&addrconf_stats->syncp); 352 } 353 354 355 idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device), 356 GFP_KERNEL); 357 if (!idev->stats.icmpv6dev) 358 goto err_icmp; 359 idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device), 360 GFP_KERNEL_ACCOUNT); 361 if (!idev->stats.icmpv6msgdev) 362 goto err_icmpmsg; 363 364 return 0; 365 366err_icmpmsg: 367 kfree(idev->stats.icmpv6dev); 368err_icmp: 369 free_percpu(idev->stats.ipv6); 370err_ip: 371 return -ENOMEM; 372} 373 374static struct inet6_dev *ipv6_add_dev(struct net_device *dev) 375{ 376 struct inet6_dev *ndev; 377 int err = -ENOMEM; 378 379 ASSERT_RTNL(); 380 381 if (dev->mtu < IPV6_MIN_MTU && dev != blackhole_netdev) 382 return ERR_PTR(-EINVAL); 383 384 ndev = kzalloc(sizeof(*ndev), GFP_KERNEL_ACCOUNT); 385 if (!ndev) 386 return ERR_PTR(err); 387 388 rwlock_init(&ndev->lock); 389 ndev->dev = dev; 390 INIT_LIST_HEAD(&ndev->addr_list); 391 timer_setup(&ndev->rs_timer, addrconf_rs_timer, 0); 392 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf)); 393 394 if (ndev->cnf.stable_secret.initialized) 395 ndev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY; 396 397 ndev->cnf.mtu6 = dev->mtu; 398 ndev->ra_mtu = 0; 399 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl); 400 if (!ndev->nd_parms) { 401 kfree(ndev); 402 return ERR_PTR(err); 403 } 404 if (ndev->cnf.forwarding) 405 dev_disable_lro(dev); 406 /* We refer to the device */ 407 netdev_hold(dev, &ndev->dev_tracker, GFP_KERNEL); 408 409 if (snmp6_alloc_dev(ndev) < 0) { 410 netdev_dbg(dev, "%s: cannot allocate memory for statistics\n", 411 __func__); 412 neigh_parms_release(&nd_tbl, ndev->nd_parms); 413 netdev_put(dev, &ndev->dev_tracker); 414 kfree(ndev); 415 return ERR_PTR(err); 416 } 417 418 if (dev != blackhole_netdev) { 419 if (snmp6_register_dev(ndev) < 0) { 420 netdev_dbg(dev, "%s: cannot create /proc/net/dev_snmp6/%s\n", 421 __func__, dev->name); 422 goto err_release; 423 } 424 } 425 /* One reference from device. */ 426 refcount_set(&ndev->refcnt, 1); 427 428 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK)) 429 ndev->cnf.accept_dad = -1; 430 431#if IS_ENABLED(CONFIG_IPV6_SIT) 432 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) { 433 pr_info("%s: Disabled Multicast RS\n", dev->name); 434 ndev->cnf.rtr_solicits = 0; 435 } 436#endif 437 438 INIT_LIST_HEAD(&ndev->tempaddr_list); 439 ndev->desync_factor = U32_MAX; 440 if ((dev->flags&IFF_LOOPBACK) || 441 dev->type == ARPHRD_TUNNEL || 442 dev->type == ARPHRD_TUNNEL6 || 443 dev->type == ARPHRD_SIT || 444 dev->type == ARPHRD_NONE) { 445 ndev->cnf.use_tempaddr = -1; 446 } 447 448 ndev->token = in6addr_any; 449 450 if (netif_running(dev) && addrconf_link_ready(dev)) 451 ndev->if_flags |= IF_READY; 452 453 ipv6_mc_init_dev(ndev); 454 ndev->tstamp = jiffies; 455 if (dev != blackhole_netdev) { 456 err = addrconf_sysctl_register(ndev); 457 if (err) { 458 ipv6_mc_destroy_dev(ndev); 459 snmp6_unregister_dev(ndev); 460 goto err_release; 461 } 462 } 463 /* protected by rtnl_lock */ 464 rcu_assign_pointer(dev->ip6_ptr, ndev); 465 466 if (dev != blackhole_netdev) { 467 /* Join interface-local all-node multicast group */ 468 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allnodes); 469 470 /* Join all-node multicast group */ 471 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes); 472 473 /* Join all-router multicast group if forwarding is set */ 474 if (ndev->cnf.forwarding && (dev->flags & IFF_MULTICAST)) 475 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters); 476 } 477 return ndev; 478 479err_release: 480 neigh_parms_release(&nd_tbl, ndev->nd_parms); 481 ndev->dead = 1; 482 in6_dev_finish_destroy(ndev); 483 return ERR_PTR(err); 484} 485 486static struct inet6_dev *ipv6_find_idev(struct net_device *dev) 487{ 488 struct inet6_dev *idev; 489 490 ASSERT_RTNL(); 491 492 idev = __in6_dev_get(dev); 493 if (!idev) { 494 idev = ipv6_add_dev(dev); 495 if (IS_ERR(idev)) 496 return idev; 497 } 498 499 if (dev->flags&IFF_UP) 500 ipv6_mc_up(idev); 501 return idev; 502} 503 504static int inet6_netconf_msgsize_devconf(int type) 505{ 506 int size = NLMSG_ALIGN(sizeof(struct netconfmsg)) 507 + nla_total_size(4); /* NETCONFA_IFINDEX */ 508 bool all = false; 509 510 if (type == NETCONFA_ALL) 511 all = true; 512 513 if (all || type == NETCONFA_FORWARDING) 514 size += nla_total_size(4); 515#ifdef CONFIG_IPV6_MROUTE 516 if (all || type == NETCONFA_MC_FORWARDING) 517 size += nla_total_size(4); 518#endif 519 if (all || type == NETCONFA_PROXY_NEIGH) 520 size += nla_total_size(4); 521 522 if (all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN) 523 size += nla_total_size(4); 524 525 return size; 526} 527 528static int inet6_netconf_fill_devconf(struct sk_buff *skb, int ifindex, 529 struct ipv6_devconf *devconf, u32 portid, 530 u32 seq, int event, unsigned int flags, 531 int type) 532{ 533 struct nlmsghdr *nlh; 534 struct netconfmsg *ncm; 535 bool all = false; 536 537 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg), 538 flags); 539 if (!nlh) 540 return -EMSGSIZE; 541 542 if (type == NETCONFA_ALL) 543 all = true; 544 545 ncm = nlmsg_data(nlh); 546 ncm->ncm_family = AF_INET6; 547 548 if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0) 549 goto nla_put_failure; 550 551 if (!devconf) 552 goto out; 553 554 if ((all || type == NETCONFA_FORWARDING) && 555 nla_put_s32(skb, NETCONFA_FORWARDING, 556 READ_ONCE(devconf->forwarding)) < 0) 557 goto nla_put_failure; 558#ifdef CONFIG_IPV6_MROUTE 559 if ((all || type == NETCONFA_MC_FORWARDING) && 560 nla_put_s32(skb, NETCONFA_MC_FORWARDING, 561 atomic_read(&devconf->mc_forwarding)) < 0) 562 goto nla_put_failure; 563#endif 564 if ((all || type == NETCONFA_PROXY_NEIGH) && 565 nla_put_s32(skb, NETCONFA_PROXY_NEIGH, 566 READ_ONCE(devconf->proxy_ndp)) < 0) 567 goto nla_put_failure; 568 569 if ((all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN) && 570 nla_put_s32(skb, NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN, 571 READ_ONCE(devconf->ignore_routes_with_linkdown)) < 0) 572 goto nla_put_failure; 573 574out: 575 nlmsg_end(skb, nlh); 576 return 0; 577 578nla_put_failure: 579 nlmsg_cancel(skb, nlh); 580 return -EMSGSIZE; 581} 582 583void inet6_netconf_notify_devconf(struct net *net, int event, int type, 584 int ifindex, struct ipv6_devconf *devconf) 585{ 586 struct sk_buff *skb; 587 int err = -ENOBUFS; 588 589 skb = nlmsg_new(inet6_netconf_msgsize_devconf(type), GFP_KERNEL); 590 if (!skb) 591 goto errout; 592 593 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 0, 0, 594 event, 0, type); 595 if (err < 0) { 596 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */ 597 WARN_ON(err == -EMSGSIZE); 598 kfree_skb(skb); 599 goto errout; 600 } 601 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_NETCONF, NULL, GFP_KERNEL); 602 return; 603errout: 604 rtnl_set_sk_err(net, RTNLGRP_IPV6_NETCONF, err); 605} 606 607static const struct nla_policy devconf_ipv6_policy[NETCONFA_MAX+1] = { 608 [NETCONFA_IFINDEX] = { .len = sizeof(int) }, 609 [NETCONFA_FORWARDING] = { .len = sizeof(int) }, 610 [NETCONFA_PROXY_NEIGH] = { .len = sizeof(int) }, 611 [NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN] = { .len = sizeof(int) }, 612}; 613 614static int inet6_netconf_valid_get_req(struct sk_buff *skb, 615 const struct nlmsghdr *nlh, 616 struct nlattr **tb, 617 struct netlink_ext_ack *extack) 618{ 619 int i, err; 620 621 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(struct netconfmsg))) { 622 NL_SET_ERR_MSG_MOD(extack, "Invalid header for netconf get request"); 623 return -EINVAL; 624 } 625 626 if (!netlink_strict_get_check(skb)) 627 return nlmsg_parse_deprecated(nlh, sizeof(struct netconfmsg), 628 tb, NETCONFA_MAX, 629 devconf_ipv6_policy, extack); 630 631 err = nlmsg_parse_deprecated_strict(nlh, sizeof(struct netconfmsg), 632 tb, NETCONFA_MAX, 633 devconf_ipv6_policy, extack); 634 if (err) 635 return err; 636 637 for (i = 0; i <= NETCONFA_MAX; i++) { 638 if (!tb[i]) 639 continue; 640 641 switch (i) { 642 case NETCONFA_IFINDEX: 643 break; 644 default: 645 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in netconf get request"); 646 return -EINVAL; 647 } 648 } 649 650 return 0; 651} 652 653static int inet6_netconf_get_devconf(struct sk_buff *in_skb, 654 struct nlmsghdr *nlh, 655 struct netlink_ext_ack *extack) 656{ 657 struct net *net = sock_net(in_skb->sk); 658 struct nlattr *tb[NETCONFA_MAX+1]; 659 struct inet6_dev *in6_dev = NULL; 660 struct net_device *dev = NULL; 661 struct sk_buff *skb; 662 struct ipv6_devconf *devconf; 663 int ifindex; 664 int err; 665 666 err = inet6_netconf_valid_get_req(in_skb, nlh, tb, extack); 667 if (err < 0) 668 return err; 669 670 if (!tb[NETCONFA_IFINDEX]) 671 return -EINVAL; 672 673 err = -EINVAL; 674 ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]); 675 switch (ifindex) { 676 case NETCONFA_IFINDEX_ALL: 677 devconf = net->ipv6.devconf_all; 678 break; 679 case NETCONFA_IFINDEX_DEFAULT: 680 devconf = net->ipv6.devconf_dflt; 681 break; 682 default: 683 dev = dev_get_by_index(net, ifindex); 684 if (!dev) 685 return -EINVAL; 686 in6_dev = in6_dev_get(dev); 687 if (!in6_dev) 688 goto errout; 689 devconf = &in6_dev->cnf; 690 break; 691 } 692 693 err = -ENOBUFS; 694 skb = nlmsg_new(inet6_netconf_msgsize_devconf(NETCONFA_ALL), GFP_KERNEL); 695 if (!skb) 696 goto errout; 697 698 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 699 NETLINK_CB(in_skb).portid, 700 nlh->nlmsg_seq, RTM_NEWNETCONF, 0, 701 NETCONFA_ALL); 702 if (err < 0) { 703 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */ 704 WARN_ON(err == -EMSGSIZE); 705 kfree_skb(skb); 706 goto errout; 707 } 708 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid); 709errout: 710 if (in6_dev) 711 in6_dev_put(in6_dev); 712 dev_put(dev); 713 return err; 714} 715 716/* Combine dev_addr_genid and dev_base_seq to detect changes. 717 */ 718static u32 inet6_base_seq(const struct net *net) 719{ 720 u32 res = atomic_read(&net->ipv6.dev_addr_genid) + 721 READ_ONCE(net->dev_base_seq); 722 723 /* Must not return 0 (see nl_dump_check_consistent()). 724 * Chose a value far away from 0. 725 */ 726 if (!res) 727 res = 0x80000000; 728 return res; 729} 730 731static int inet6_netconf_dump_devconf(struct sk_buff *skb, 732 struct netlink_callback *cb) 733{ 734 const struct nlmsghdr *nlh = cb->nlh; 735 struct net *net = sock_net(skb->sk); 736 struct { 737 unsigned long ifindex; 738 unsigned int all_default; 739 } *ctx = (void *)cb->ctx; 740 struct net_device *dev; 741 struct inet6_dev *idev; 742 int err = 0; 743 744 if (cb->strict_check) { 745 struct netlink_ext_ack *extack = cb->extack; 746 struct netconfmsg *ncm; 747 748 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ncm))) { 749 NL_SET_ERR_MSG_MOD(extack, "Invalid header for netconf dump request"); 750 return -EINVAL; 751 } 752 753 if (nlmsg_attrlen(nlh, sizeof(*ncm))) { 754 NL_SET_ERR_MSG_MOD(extack, "Invalid data after header in netconf dump request"); 755 return -EINVAL; 756 } 757 } 758 759 rcu_read_lock(); 760 for_each_netdev_dump(net, dev, ctx->ifindex) { 761 idev = __in6_dev_get(dev); 762 if (!idev) 763 continue; 764 err = inet6_netconf_fill_devconf(skb, dev->ifindex, 765 &idev->cnf, 766 NETLINK_CB(cb->skb).portid, 767 nlh->nlmsg_seq, 768 RTM_NEWNETCONF, 769 NLM_F_MULTI, 770 NETCONFA_ALL); 771 if (err < 0) 772 goto done; 773 } 774 if (ctx->all_default == 0) { 775 err = inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL, 776 net->ipv6.devconf_all, 777 NETLINK_CB(cb->skb).portid, 778 nlh->nlmsg_seq, 779 RTM_NEWNETCONF, NLM_F_MULTI, 780 NETCONFA_ALL); 781 if (err < 0) 782 goto done; 783 ctx->all_default++; 784 } 785 if (ctx->all_default == 1) { 786 err = inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT, 787 net->ipv6.devconf_dflt, 788 NETLINK_CB(cb->skb).portid, 789 nlh->nlmsg_seq, 790 RTM_NEWNETCONF, NLM_F_MULTI, 791 NETCONFA_ALL); 792 if (err < 0) 793 goto done; 794 ctx->all_default++; 795 } 796done: 797 rcu_read_unlock(); 798 return err; 799} 800 801#ifdef CONFIG_SYSCTL 802static void dev_forward_change(struct inet6_dev *idev) 803{ 804 struct net_device *dev; 805 struct inet6_ifaddr *ifa; 806 LIST_HEAD(tmp_addr_list); 807 808 if (!idev) 809 return; 810 dev = idev->dev; 811 if (idev->cnf.forwarding) 812 dev_disable_lro(dev); 813 if (dev->flags & IFF_MULTICAST) { 814 if (idev->cnf.forwarding) { 815 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters); 816 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allrouters); 817 ipv6_dev_mc_inc(dev, &in6addr_sitelocal_allrouters); 818 } else { 819 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters); 820 ipv6_dev_mc_dec(dev, &in6addr_interfacelocal_allrouters); 821 ipv6_dev_mc_dec(dev, &in6addr_sitelocal_allrouters); 822 } 823 } 824 825 read_lock_bh(&idev->lock); 826 list_for_each_entry(ifa, &idev->addr_list, if_list) { 827 if (ifa->flags&IFA_F_TENTATIVE) 828 continue; 829 list_add_tail(&ifa->if_list_aux, &tmp_addr_list); 830 } 831 read_unlock_bh(&idev->lock); 832 833 while (!list_empty(&tmp_addr_list)) { 834 ifa = list_first_entry(&tmp_addr_list, 835 struct inet6_ifaddr, if_list_aux); 836 list_del(&ifa->if_list_aux); 837 if (idev->cnf.forwarding) 838 addrconf_join_anycast(ifa); 839 else 840 addrconf_leave_anycast(ifa); 841 } 842 843 inet6_netconf_notify_devconf(dev_net(dev), RTM_NEWNETCONF, 844 NETCONFA_FORWARDING, 845 dev->ifindex, &idev->cnf); 846} 847 848 849static void addrconf_forward_change(struct net *net, __s32 newf) 850{ 851 struct net_device *dev; 852 struct inet6_dev *idev; 853 854 for_each_netdev(net, dev) { 855 idev = __in6_dev_get(dev); 856 if (idev) { 857 int changed = (!idev->cnf.forwarding) ^ (!newf); 858 859 WRITE_ONCE(idev->cnf.forwarding, newf); 860 if (changed) 861 dev_forward_change(idev); 862 } 863 } 864} 865 866static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf) 867{ 868 struct net *net; 869 int old; 870 871 if (!rtnl_trylock()) 872 return restart_syscall(); 873 874 net = (struct net *)table->extra2; 875 old = *p; 876 WRITE_ONCE(*p, newf); 877 878 if (p == &net->ipv6.devconf_dflt->forwarding) { 879 if ((!newf) ^ (!old)) 880 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 881 NETCONFA_FORWARDING, 882 NETCONFA_IFINDEX_DEFAULT, 883 net->ipv6.devconf_dflt); 884 rtnl_unlock(); 885 return 0; 886 } 887 888 if (p == &net->ipv6.devconf_all->forwarding) { 889 int old_dflt = net->ipv6.devconf_dflt->forwarding; 890 891 WRITE_ONCE(net->ipv6.devconf_dflt->forwarding, newf); 892 if ((!newf) ^ (!old_dflt)) 893 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 894 NETCONFA_FORWARDING, 895 NETCONFA_IFINDEX_DEFAULT, 896 net->ipv6.devconf_dflt); 897 898 addrconf_forward_change(net, newf); 899 if ((!newf) ^ (!old)) 900 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 901 NETCONFA_FORWARDING, 902 NETCONFA_IFINDEX_ALL, 903 net->ipv6.devconf_all); 904 } else if ((!newf) ^ (!old)) 905 dev_forward_change((struct inet6_dev *)table->extra1); 906 rtnl_unlock(); 907 908 if (newf) 909 rt6_purge_dflt_routers(net); 910 return 1; 911} 912 913static void addrconf_linkdown_change(struct net *net, __s32 newf) 914{ 915 struct net_device *dev; 916 struct inet6_dev *idev; 917 918 for_each_netdev(net, dev) { 919 idev = __in6_dev_get(dev); 920 if (idev) { 921 int changed = (!idev->cnf.ignore_routes_with_linkdown) ^ (!newf); 922 923 WRITE_ONCE(idev->cnf.ignore_routes_with_linkdown, newf); 924 if (changed) 925 inet6_netconf_notify_devconf(dev_net(dev), 926 RTM_NEWNETCONF, 927 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN, 928 dev->ifindex, 929 &idev->cnf); 930 } 931 } 932} 933 934static int addrconf_fixup_linkdown(struct ctl_table *table, int *p, int newf) 935{ 936 struct net *net; 937 int old; 938 939 if (!rtnl_trylock()) 940 return restart_syscall(); 941 942 net = (struct net *)table->extra2; 943 old = *p; 944 WRITE_ONCE(*p, newf); 945 946 if (p == &net->ipv6.devconf_dflt->ignore_routes_with_linkdown) { 947 if ((!newf) ^ (!old)) 948 inet6_netconf_notify_devconf(net, 949 RTM_NEWNETCONF, 950 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN, 951 NETCONFA_IFINDEX_DEFAULT, 952 net->ipv6.devconf_dflt); 953 rtnl_unlock(); 954 return 0; 955 } 956 957 if (p == &net->ipv6.devconf_all->ignore_routes_with_linkdown) { 958 WRITE_ONCE(net->ipv6.devconf_dflt->ignore_routes_with_linkdown, newf); 959 addrconf_linkdown_change(net, newf); 960 if ((!newf) ^ (!old)) 961 inet6_netconf_notify_devconf(net, 962 RTM_NEWNETCONF, 963 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN, 964 NETCONFA_IFINDEX_ALL, 965 net->ipv6.devconf_all); 966 } 967 rtnl_unlock(); 968 969 return 1; 970} 971 972#endif 973 974/* Nobody refers to this ifaddr, destroy it */ 975void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp) 976{ 977 WARN_ON(!hlist_unhashed(&ifp->addr_lst)); 978 979#ifdef NET_REFCNT_DEBUG 980 pr_debug("%s\n", __func__); 981#endif 982 983 in6_dev_put(ifp->idev); 984 985 if (cancel_delayed_work(&ifp->dad_work)) 986 pr_notice("delayed DAD work was pending while freeing ifa=%p\n", 987 ifp); 988 989 if (ifp->state != INET6_IFADDR_STATE_DEAD) { 990 pr_warn("Freeing alive inet6 address %p\n", ifp); 991 return; 992 } 993 994 kfree_rcu(ifp, rcu); 995} 996 997static void 998ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp) 999{ 1000 struct list_head *p; 1001 int ifp_scope = ipv6_addr_src_scope(&ifp->addr); 1002 1003 /* 1004 * Each device address list is sorted in order of scope - 1005 * global before linklocal. 1006 */ 1007 list_for_each(p, &idev->addr_list) { 1008 struct inet6_ifaddr *ifa 1009 = list_entry(p, struct inet6_ifaddr, if_list); 1010 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr)) 1011 break; 1012 } 1013 1014 list_add_tail_rcu(&ifp->if_list, p); 1015} 1016 1017static u32 inet6_addr_hash(const struct net *net, const struct in6_addr *addr) 1018{ 1019 u32 val = ipv6_addr_hash(addr) ^ net_hash_mix(net); 1020 1021 return hash_32(val, IN6_ADDR_HSIZE_SHIFT); 1022} 1023 1024static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr, 1025 struct net_device *dev, unsigned int hash) 1026{ 1027 struct inet6_ifaddr *ifp; 1028 1029 hlist_for_each_entry(ifp, &net->ipv6.inet6_addr_lst[hash], addr_lst) { 1030 if (ipv6_addr_equal(&ifp->addr, addr)) { 1031 if (!dev || ifp->idev->dev == dev) 1032 return true; 1033 } 1034 } 1035 return false; 1036} 1037 1038static int ipv6_add_addr_hash(struct net_device *dev, struct inet6_ifaddr *ifa) 1039{ 1040 struct net *net = dev_net(dev); 1041 unsigned int hash = inet6_addr_hash(net, &ifa->addr); 1042 int err = 0; 1043 1044 spin_lock_bh(&net->ipv6.addrconf_hash_lock); 1045 1046 /* Ignore adding duplicate addresses on an interface */ 1047 if (ipv6_chk_same_addr(net, &ifa->addr, dev, hash)) { 1048 netdev_dbg(dev, "ipv6_add_addr: already assigned\n"); 1049 err = -EEXIST; 1050 } else { 1051 hlist_add_head_rcu(&ifa->addr_lst, &net->ipv6.inet6_addr_lst[hash]); 1052 } 1053 1054 spin_unlock_bh(&net->ipv6.addrconf_hash_lock); 1055 1056 return err; 1057} 1058 1059/* On success it returns ifp with increased reference count */ 1060 1061static struct inet6_ifaddr * 1062ipv6_add_addr(struct inet6_dev *idev, struct ifa6_config *cfg, 1063 bool can_block, struct netlink_ext_ack *extack) 1064{ 1065 gfp_t gfp_flags = can_block ? GFP_KERNEL : GFP_ATOMIC; 1066 int addr_type = ipv6_addr_type(cfg->pfx); 1067 struct net *net = dev_net(idev->dev); 1068 struct inet6_ifaddr *ifa = NULL; 1069 struct fib6_info *f6i = NULL; 1070 int err = 0; 1071 1072 if (addr_type == IPV6_ADDR_ANY) { 1073 NL_SET_ERR_MSG_MOD(extack, "Invalid address"); 1074 return ERR_PTR(-EADDRNOTAVAIL); 1075 } else if (addr_type & IPV6_ADDR_MULTICAST && 1076 !(cfg->ifa_flags & IFA_F_MCAUTOJOIN)) { 1077 NL_SET_ERR_MSG_MOD(extack, "Cannot assign multicast address without \"IFA_F_MCAUTOJOIN\" flag"); 1078 return ERR_PTR(-EADDRNOTAVAIL); 1079 } else if (!(idev->dev->flags & IFF_LOOPBACK) && 1080 !netif_is_l3_master(idev->dev) && 1081 addr_type & IPV6_ADDR_LOOPBACK) { 1082 NL_SET_ERR_MSG_MOD(extack, "Cannot assign loopback address on this device"); 1083 return ERR_PTR(-EADDRNOTAVAIL); 1084 } 1085 1086 if (idev->dead) { 1087 NL_SET_ERR_MSG_MOD(extack, "device is going away"); 1088 err = -ENODEV; 1089 goto out; 1090 } 1091 1092 if (idev->cnf.disable_ipv6) { 1093 NL_SET_ERR_MSG_MOD(extack, "IPv6 is disabled on this device"); 1094 err = -EACCES; 1095 goto out; 1096 } 1097 1098 /* validator notifier needs to be blocking; 1099 * do not call in atomic context 1100 */ 1101 if (can_block) { 1102 struct in6_validator_info i6vi = { 1103 .i6vi_addr = *cfg->pfx, 1104 .i6vi_dev = idev, 1105 .extack = extack, 1106 }; 1107 1108 err = inet6addr_validator_notifier_call_chain(NETDEV_UP, &i6vi); 1109 err = notifier_to_errno(err); 1110 if (err < 0) 1111 goto out; 1112 } 1113 1114 ifa = kzalloc(sizeof(*ifa), gfp_flags | __GFP_ACCOUNT); 1115 if (!ifa) { 1116 err = -ENOBUFS; 1117 goto out; 1118 } 1119 1120 f6i = addrconf_f6i_alloc(net, idev, cfg->pfx, false, gfp_flags, extack); 1121 if (IS_ERR(f6i)) { 1122 err = PTR_ERR(f6i); 1123 f6i = NULL; 1124 goto out; 1125 } 1126 1127 neigh_parms_data_state_setall(idev->nd_parms); 1128 1129 ifa->addr = *cfg->pfx; 1130 if (cfg->peer_pfx) 1131 ifa->peer_addr = *cfg->peer_pfx; 1132 1133 spin_lock_init(&ifa->lock); 1134 INIT_DELAYED_WORK(&ifa->dad_work, addrconf_dad_work); 1135 INIT_HLIST_NODE(&ifa->addr_lst); 1136 ifa->scope = cfg->scope; 1137 ifa->prefix_len = cfg->plen; 1138 ifa->rt_priority = cfg->rt_priority; 1139 ifa->flags = cfg->ifa_flags; 1140 ifa->ifa_proto = cfg->ifa_proto; 1141 /* No need to add the TENTATIVE flag for addresses with NODAD */ 1142 if (!(cfg->ifa_flags & IFA_F_NODAD)) 1143 ifa->flags |= IFA_F_TENTATIVE; 1144 ifa->valid_lft = cfg->valid_lft; 1145 ifa->prefered_lft = cfg->preferred_lft; 1146 ifa->cstamp = ifa->tstamp = jiffies; 1147 ifa->tokenized = false; 1148 1149 ifa->rt = f6i; 1150 1151 ifa->idev = idev; 1152 in6_dev_hold(idev); 1153 1154 /* For caller */ 1155 refcount_set(&ifa->refcnt, 1); 1156 1157 rcu_read_lock(); 1158 1159 err = ipv6_add_addr_hash(idev->dev, ifa); 1160 if (err < 0) { 1161 rcu_read_unlock(); 1162 goto out; 1163 } 1164 1165 write_lock_bh(&idev->lock); 1166 1167 /* Add to inet6_dev unicast addr list. */ 1168 ipv6_link_dev_addr(idev, ifa); 1169 1170 if (ifa->flags&IFA_F_TEMPORARY) { 1171 list_add(&ifa->tmp_list, &idev->tempaddr_list); 1172 in6_ifa_hold(ifa); 1173 } 1174 1175 in6_ifa_hold(ifa); 1176 write_unlock_bh(&idev->lock); 1177 1178 rcu_read_unlock(); 1179 1180 inet6addr_notifier_call_chain(NETDEV_UP, ifa); 1181out: 1182 if (unlikely(err < 0)) { 1183 fib6_info_release(f6i); 1184 1185 if (ifa) { 1186 if (ifa->idev) 1187 in6_dev_put(ifa->idev); 1188 kfree(ifa); 1189 } 1190 ifa = ERR_PTR(err); 1191 } 1192 1193 return ifa; 1194} 1195 1196enum cleanup_prefix_rt_t { 1197 CLEANUP_PREFIX_RT_NOP, /* no cleanup action for prefix route */ 1198 CLEANUP_PREFIX_RT_DEL, /* delete the prefix route */ 1199 CLEANUP_PREFIX_RT_EXPIRE, /* update the lifetime of the prefix route */ 1200}; 1201 1202/* 1203 * Check, whether the prefix for ifp would still need a prefix route 1204 * after deleting ifp. The function returns one of the CLEANUP_PREFIX_RT_* 1205 * constants. 1206 * 1207 * 1) we don't purge prefix if address was not permanent. 1208 * prefix is managed by its own lifetime. 1209 * 2) we also don't purge, if the address was IFA_F_NOPREFIXROUTE. 1210 * 3) if there are no addresses, delete prefix. 1211 * 4) if there are still other permanent address(es), 1212 * corresponding prefix is still permanent. 1213 * 5) if there are still other addresses with IFA_F_NOPREFIXROUTE, 1214 * don't purge the prefix, assume user space is managing it. 1215 * 6) otherwise, update prefix lifetime to the 1216 * longest valid lifetime among the corresponding 1217 * addresses on the device. 1218 * Note: subsequent RA will update lifetime. 1219 **/ 1220static enum cleanup_prefix_rt_t 1221check_cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long *expires) 1222{ 1223 struct inet6_ifaddr *ifa; 1224 struct inet6_dev *idev = ifp->idev; 1225 unsigned long lifetime; 1226 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_DEL; 1227 1228 *expires = jiffies; 1229 1230 list_for_each_entry(ifa, &idev->addr_list, if_list) { 1231 if (ifa == ifp) 1232 continue; 1233 if (ifa->prefix_len != ifp->prefix_len || 1234 !ipv6_prefix_equal(&ifa->addr, &ifp->addr, 1235 ifp->prefix_len)) 1236 continue; 1237 if (ifa->flags & (IFA_F_PERMANENT | IFA_F_NOPREFIXROUTE)) 1238 return CLEANUP_PREFIX_RT_NOP; 1239 1240 action = CLEANUP_PREFIX_RT_EXPIRE; 1241 1242 spin_lock(&ifa->lock); 1243 1244 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ); 1245 /* 1246 * Note: Because this address is 1247 * not permanent, lifetime < 1248 * LONG_MAX / HZ here. 1249 */ 1250 if (time_before(*expires, ifa->tstamp + lifetime * HZ)) 1251 *expires = ifa->tstamp + lifetime * HZ; 1252 spin_unlock(&ifa->lock); 1253 } 1254 1255 return action; 1256} 1257 1258static void 1259cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long expires, 1260 bool del_rt, bool del_peer) 1261{ 1262 struct fib6_table *table; 1263 struct fib6_info *f6i; 1264 1265 f6i = addrconf_get_prefix_route(del_peer ? &ifp->peer_addr : &ifp->addr, 1266 ifp->prefix_len, 1267 ifp->idev->dev, 0, RTF_DEFAULT, true); 1268 if (f6i) { 1269 if (del_rt) 1270 ip6_del_rt(dev_net(ifp->idev->dev), f6i, false); 1271 else { 1272 if (!(f6i->fib6_flags & RTF_EXPIRES)) { 1273 table = f6i->fib6_table; 1274 spin_lock_bh(&table->tb6_lock); 1275 1276 fib6_set_expires(f6i, expires); 1277 fib6_add_gc_list(f6i); 1278 1279 spin_unlock_bh(&table->tb6_lock); 1280 } 1281 fib6_info_release(f6i); 1282 } 1283 } 1284} 1285 1286 1287/* This function wants to get referenced ifp and releases it before return */ 1288 1289static void ipv6_del_addr(struct inet6_ifaddr *ifp) 1290{ 1291 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_NOP; 1292 struct net *net = dev_net(ifp->idev->dev); 1293 unsigned long expires; 1294 int state; 1295 1296 ASSERT_RTNL(); 1297 1298 spin_lock_bh(&ifp->lock); 1299 state = ifp->state; 1300 ifp->state = INET6_IFADDR_STATE_DEAD; 1301 spin_unlock_bh(&ifp->lock); 1302 1303 if (state == INET6_IFADDR_STATE_DEAD) 1304 goto out; 1305 1306 spin_lock_bh(&net->ipv6.addrconf_hash_lock); 1307 hlist_del_init_rcu(&ifp->addr_lst); 1308 spin_unlock_bh(&net->ipv6.addrconf_hash_lock); 1309 1310 write_lock_bh(&ifp->idev->lock); 1311 1312 if (ifp->flags&IFA_F_TEMPORARY) { 1313 list_del(&ifp->tmp_list); 1314 if (ifp->ifpub) { 1315 in6_ifa_put(ifp->ifpub); 1316 ifp->ifpub = NULL; 1317 } 1318 __in6_ifa_put(ifp); 1319 } 1320 1321 if (ifp->flags & IFA_F_PERMANENT && !(ifp->flags & IFA_F_NOPREFIXROUTE)) 1322 action = check_cleanup_prefix_route(ifp, &expires); 1323 1324 list_del_rcu(&ifp->if_list); 1325 __in6_ifa_put(ifp); 1326 1327 write_unlock_bh(&ifp->idev->lock); 1328 1329 addrconf_del_dad_work(ifp); 1330 1331 ipv6_ifa_notify(RTM_DELADDR, ifp); 1332 1333 inet6addr_notifier_call_chain(NETDEV_DOWN, ifp); 1334 1335 if (action != CLEANUP_PREFIX_RT_NOP) { 1336 cleanup_prefix_route(ifp, expires, 1337 action == CLEANUP_PREFIX_RT_DEL, false); 1338 } 1339 1340 /* clean up prefsrc entries */ 1341 rt6_remove_prefsrc(ifp); 1342out: 1343 in6_ifa_put(ifp); 1344} 1345 1346static unsigned long ipv6_get_regen_advance(const struct inet6_dev *idev) 1347{ 1348 return READ_ONCE(idev->cnf.regen_min_advance) + 1349 READ_ONCE(idev->cnf.regen_max_retry) * 1350 READ_ONCE(idev->cnf.dad_transmits) * 1351 max(NEIGH_VAR(idev->nd_parms, RETRANS_TIME), HZ/100) / HZ; 1352} 1353 1354static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, bool block) 1355{ 1356 struct inet6_dev *idev = ifp->idev; 1357 unsigned long tmp_tstamp, age; 1358 unsigned long regen_advance; 1359 unsigned long now = jiffies; 1360 u32 if_public_preferred_lft; 1361 s32 cnf_temp_preferred_lft; 1362 struct inet6_ifaddr *ift; 1363 struct ifa6_config cfg; 1364 long max_desync_factor; 1365 struct in6_addr addr; 1366 int ret = 0; 1367 1368 write_lock_bh(&idev->lock); 1369 1370retry: 1371 in6_dev_hold(idev); 1372 if (READ_ONCE(idev->cnf.use_tempaddr) <= 0) { 1373 write_unlock_bh(&idev->lock); 1374 pr_info("%s: use_tempaddr is disabled\n", __func__); 1375 in6_dev_put(idev); 1376 ret = -1; 1377 goto out; 1378 } 1379 spin_lock_bh(&ifp->lock); 1380 if (ifp->regen_count++ >= READ_ONCE(idev->cnf.regen_max_retry)) { 1381 WRITE_ONCE(idev->cnf.use_tempaddr, -1); /*XXX*/ 1382 spin_unlock_bh(&ifp->lock); 1383 write_unlock_bh(&idev->lock); 1384 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n", 1385 __func__); 1386 in6_dev_put(idev); 1387 ret = -1; 1388 goto out; 1389 } 1390 in6_ifa_hold(ifp); 1391 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8); 1392 ipv6_gen_rnd_iid(&addr); 1393 1394 age = (now - ifp->tstamp) / HZ; 1395 1396 regen_advance = ipv6_get_regen_advance(idev); 1397 1398 /* recalculate max_desync_factor each time and update 1399 * idev->desync_factor if it's larger 1400 */ 1401 cnf_temp_preferred_lft = READ_ONCE(idev->cnf.temp_prefered_lft); 1402 max_desync_factor = min_t(long, 1403 READ_ONCE(idev->cnf.max_desync_factor), 1404 cnf_temp_preferred_lft - regen_advance); 1405 1406 if (unlikely(idev->desync_factor > max_desync_factor)) { 1407 if (max_desync_factor > 0) { 1408 get_random_bytes(&idev->desync_factor, 1409 sizeof(idev->desync_factor)); 1410 idev->desync_factor %= max_desync_factor; 1411 } else { 1412 idev->desync_factor = 0; 1413 } 1414 } 1415 1416 if_public_preferred_lft = ifp->prefered_lft; 1417 1418 memset(&cfg, 0, sizeof(cfg)); 1419 cfg.valid_lft = min_t(__u32, ifp->valid_lft, 1420 READ_ONCE(idev->cnf.temp_valid_lft) + age); 1421 cfg.preferred_lft = cnf_temp_preferred_lft + age - idev->desync_factor; 1422 cfg.preferred_lft = min_t(__u32, if_public_preferred_lft, cfg.preferred_lft); 1423 cfg.preferred_lft = min_t(__u32, cfg.valid_lft, cfg.preferred_lft); 1424 1425 cfg.plen = ifp->prefix_len; 1426 tmp_tstamp = ifp->tstamp; 1427 spin_unlock_bh(&ifp->lock); 1428 1429 write_unlock_bh(&idev->lock); 1430 1431 /* From RFC 4941: 1432 * 1433 * A temporary address is created only if this calculated Preferred 1434 * Lifetime is greater than REGEN_ADVANCE time units. In 1435 * particular, an implementation must not create a temporary address 1436 * with a zero Preferred Lifetime. 1437 * 1438 * ... 1439 * 1440 * When creating a temporary address, the lifetime values MUST be 1441 * derived from the corresponding prefix as follows: 1442 * 1443 * ... 1444 * 1445 * * Its Preferred Lifetime is the lower of the Preferred Lifetime 1446 * of the public address or TEMP_PREFERRED_LIFETIME - 1447 * DESYNC_FACTOR. 1448 * 1449 * To comply with the RFC's requirements, clamp the preferred lifetime 1450 * to a minimum of regen_advance, unless that would exceed valid_lft or 1451 * ifp->prefered_lft. 1452 * 1453 * Use age calculation as in addrconf_verify to avoid unnecessary 1454 * temporary addresses being generated. 1455 */ 1456 age = (now - tmp_tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ; 1457 if (cfg.preferred_lft <= regen_advance + age) { 1458 cfg.preferred_lft = regen_advance + age + 1; 1459 if (cfg.preferred_lft > cfg.valid_lft || 1460 cfg.preferred_lft > if_public_preferred_lft) { 1461 in6_ifa_put(ifp); 1462 in6_dev_put(idev); 1463 ret = -1; 1464 goto out; 1465 } 1466 } 1467 1468 cfg.ifa_flags = IFA_F_TEMPORARY; 1469 /* set in addrconf_prefix_rcv() */ 1470 if (ifp->flags & IFA_F_OPTIMISTIC) 1471 cfg.ifa_flags |= IFA_F_OPTIMISTIC; 1472 1473 cfg.pfx = &addr; 1474 cfg.scope = ipv6_addr_scope(cfg.pfx); 1475 1476 ift = ipv6_add_addr(idev, &cfg, block, NULL); 1477 if (IS_ERR(ift)) { 1478 in6_ifa_put(ifp); 1479 in6_dev_put(idev); 1480 pr_info("%s: retry temporary address regeneration\n", __func__); 1481 write_lock_bh(&idev->lock); 1482 goto retry; 1483 } 1484 1485 spin_lock_bh(&ift->lock); 1486 ift->ifpub = ifp; 1487 ift->cstamp = now; 1488 ift->tstamp = tmp_tstamp; 1489 spin_unlock_bh(&ift->lock); 1490 1491 addrconf_dad_start(ift); 1492 in6_ifa_put(ift); 1493 in6_dev_put(idev); 1494out: 1495 return ret; 1496} 1497 1498/* 1499 * Choose an appropriate source address (RFC3484) 1500 */ 1501enum { 1502 IPV6_SADDR_RULE_INIT = 0, 1503 IPV6_SADDR_RULE_LOCAL, 1504 IPV6_SADDR_RULE_SCOPE, 1505 IPV6_SADDR_RULE_PREFERRED, 1506#ifdef CONFIG_IPV6_MIP6 1507 IPV6_SADDR_RULE_HOA, 1508#endif 1509 IPV6_SADDR_RULE_OIF, 1510 IPV6_SADDR_RULE_LABEL, 1511 IPV6_SADDR_RULE_PRIVACY, 1512 IPV6_SADDR_RULE_ORCHID, 1513 IPV6_SADDR_RULE_PREFIX, 1514#ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1515 IPV6_SADDR_RULE_NOT_OPTIMISTIC, 1516#endif 1517 IPV6_SADDR_RULE_MAX 1518}; 1519 1520struct ipv6_saddr_score { 1521 int rule; 1522 int addr_type; 1523 struct inet6_ifaddr *ifa; 1524 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX); 1525 int scopedist; 1526 int matchlen; 1527}; 1528 1529struct ipv6_saddr_dst { 1530 const struct in6_addr *addr; 1531 int ifindex; 1532 int scope; 1533 int label; 1534 unsigned int prefs; 1535}; 1536 1537static inline int ipv6_saddr_preferred(int type) 1538{ 1539 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK)) 1540 return 1; 1541 return 0; 1542} 1543 1544static bool ipv6_use_optimistic_addr(const struct net *net, 1545 const struct inet6_dev *idev) 1546{ 1547#ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1548 if (!idev) 1549 return false; 1550 if (!READ_ONCE(net->ipv6.devconf_all->optimistic_dad) && 1551 !READ_ONCE(idev->cnf.optimistic_dad)) 1552 return false; 1553 if (!READ_ONCE(net->ipv6.devconf_all->use_optimistic) && 1554 !READ_ONCE(idev->cnf.use_optimistic)) 1555 return false; 1556 1557 return true; 1558#else 1559 return false; 1560#endif 1561} 1562 1563static bool ipv6_allow_optimistic_dad(const struct net *net, 1564 const struct inet6_dev *idev) 1565{ 1566#ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1567 if (!idev) 1568 return false; 1569 if (!READ_ONCE(net->ipv6.devconf_all->optimistic_dad) && 1570 !READ_ONCE(idev->cnf.optimistic_dad)) 1571 return false; 1572 1573 return true; 1574#else 1575 return false; 1576#endif 1577} 1578 1579static int ipv6_get_saddr_eval(struct net *net, 1580 struct ipv6_saddr_score *score, 1581 struct ipv6_saddr_dst *dst, 1582 int i) 1583{ 1584 int ret; 1585 1586 if (i <= score->rule) { 1587 switch (i) { 1588 case IPV6_SADDR_RULE_SCOPE: 1589 ret = score->scopedist; 1590 break; 1591 case IPV6_SADDR_RULE_PREFIX: 1592 ret = score->matchlen; 1593 break; 1594 default: 1595 ret = !!test_bit(i, score->scorebits); 1596 } 1597 goto out; 1598 } 1599 1600 switch (i) { 1601 case IPV6_SADDR_RULE_INIT: 1602 /* Rule 0: remember if hiscore is not ready yet */ 1603 ret = !!score->ifa; 1604 break; 1605 case IPV6_SADDR_RULE_LOCAL: 1606 /* Rule 1: Prefer same address */ 1607 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr); 1608 break; 1609 case IPV6_SADDR_RULE_SCOPE: 1610 /* Rule 2: Prefer appropriate scope 1611 * 1612 * ret 1613 * ^ 1614 * -1 | d 15 1615 * ---+--+-+---> scope 1616 * | 1617 * | d is scope of the destination. 1618 * B-d | \ 1619 * | \ <- smaller scope is better if 1620 * B-15 | \ if scope is enough for destination. 1621 * | ret = B - scope (-1 <= scope >= d <= 15). 1622 * d-C-1 | / 1623 * |/ <- greater is better 1624 * -C / if scope is not enough for destination. 1625 * /| ret = scope - C (-1 <= d < scope <= 15). 1626 * 1627 * d - C - 1 < B -15 (for all -1 <= d <= 15). 1628 * C > d + 14 - B >= 15 + 14 - B = 29 - B. 1629 * Assume B = 0 and we get C > 29. 1630 */ 1631 ret = __ipv6_addr_src_scope(score->addr_type); 1632 if (ret >= dst->scope) 1633 ret = -ret; 1634 else 1635 ret -= 128; /* 30 is enough */ 1636 score->scopedist = ret; 1637 break; 1638 case IPV6_SADDR_RULE_PREFERRED: 1639 { 1640 /* Rule 3: Avoid deprecated and optimistic addresses */ 1641 u8 avoid = IFA_F_DEPRECATED; 1642 1643 if (!ipv6_use_optimistic_addr(net, score->ifa->idev)) 1644 avoid |= IFA_F_OPTIMISTIC; 1645 ret = ipv6_saddr_preferred(score->addr_type) || 1646 !(score->ifa->flags & avoid); 1647 break; 1648 } 1649#ifdef CONFIG_IPV6_MIP6 1650 case IPV6_SADDR_RULE_HOA: 1651 { 1652 /* Rule 4: Prefer home address */ 1653 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA); 1654 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome; 1655 break; 1656 } 1657#endif 1658 case IPV6_SADDR_RULE_OIF: 1659 /* Rule 5: Prefer outgoing interface */ 1660 ret = (!dst->ifindex || 1661 dst->ifindex == score->ifa->idev->dev->ifindex); 1662 break; 1663 case IPV6_SADDR_RULE_LABEL: 1664 /* Rule 6: Prefer matching label */ 1665 ret = ipv6_addr_label(net, 1666 &score->ifa->addr, score->addr_type, 1667 score->ifa->idev->dev->ifindex) == dst->label; 1668 break; 1669 case IPV6_SADDR_RULE_PRIVACY: 1670 { 1671 /* Rule 7: Prefer public address 1672 * Note: prefer temporary address if use_tempaddr >= 2 1673 */ 1674 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ? 1675 !!(dst->prefs & IPV6_PREFER_SRC_TMP) : 1676 READ_ONCE(score->ifa->idev->cnf.use_tempaddr) >= 2; 1677 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp; 1678 break; 1679 } 1680 case IPV6_SADDR_RULE_ORCHID: 1681 /* Rule 8-: Prefer ORCHID vs ORCHID or 1682 * non-ORCHID vs non-ORCHID 1683 */ 1684 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^ 1685 ipv6_addr_orchid(dst->addr)); 1686 break; 1687 case IPV6_SADDR_RULE_PREFIX: 1688 /* Rule 8: Use longest matching prefix */ 1689 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr); 1690 if (ret > score->ifa->prefix_len) 1691 ret = score->ifa->prefix_len; 1692 score->matchlen = ret; 1693 break; 1694#ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1695 case IPV6_SADDR_RULE_NOT_OPTIMISTIC: 1696 /* Optimistic addresses still have lower precedence than other 1697 * preferred addresses. 1698 */ 1699 ret = !(score->ifa->flags & IFA_F_OPTIMISTIC); 1700 break; 1701#endif 1702 default: 1703 ret = 0; 1704 } 1705 1706 if (ret) 1707 __set_bit(i, score->scorebits); 1708 score->rule = i; 1709out: 1710 return ret; 1711} 1712 1713static int __ipv6_dev_get_saddr(struct net *net, 1714 struct ipv6_saddr_dst *dst, 1715 struct inet6_dev *idev, 1716 struct ipv6_saddr_score *scores, 1717 int hiscore_idx) 1718{ 1719 struct ipv6_saddr_score *score = &scores[1 - hiscore_idx], *hiscore = &scores[hiscore_idx]; 1720 1721 list_for_each_entry_rcu(score->ifa, &idev->addr_list, if_list) { 1722 int i; 1723 1724 /* 1725 * - Tentative Address (RFC2462 section 5.4) 1726 * - A tentative address is not considered 1727 * "assigned to an interface" in the traditional 1728 * sense, unless it is also flagged as optimistic. 1729 * - Candidate Source Address (section 4) 1730 * - In any case, anycast addresses, multicast 1731 * addresses, and the unspecified address MUST 1732 * NOT be included in a candidate set. 1733 */ 1734 if ((score->ifa->flags & IFA_F_TENTATIVE) && 1735 (!(score->ifa->flags & IFA_F_OPTIMISTIC))) 1736 continue; 1737 1738 score->addr_type = __ipv6_addr_type(&score->ifa->addr); 1739 1740 if (unlikely(score->addr_type == IPV6_ADDR_ANY || 1741 score->addr_type & IPV6_ADDR_MULTICAST)) { 1742 net_dbg_ratelimited("ADDRCONF: unspecified / multicast address assigned as unicast address on %s", 1743 idev->dev->name); 1744 continue; 1745 } 1746 1747 score->rule = -1; 1748 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX); 1749 1750 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) { 1751 int minihiscore, miniscore; 1752 1753 minihiscore = ipv6_get_saddr_eval(net, hiscore, dst, i); 1754 miniscore = ipv6_get_saddr_eval(net, score, dst, i); 1755 1756 if (minihiscore > miniscore) { 1757 if (i == IPV6_SADDR_RULE_SCOPE && 1758 score->scopedist > 0) { 1759 /* 1760 * special case: 1761 * each remaining entry 1762 * has too small (not enough) 1763 * scope, because ifa entries 1764 * are sorted by their scope 1765 * values. 1766 */ 1767 goto out; 1768 } 1769 break; 1770 } else if (minihiscore < miniscore) { 1771 swap(hiscore, score); 1772 hiscore_idx = 1 - hiscore_idx; 1773 1774 /* restore our iterator */ 1775 score->ifa = hiscore->ifa; 1776 1777 break; 1778 } 1779 } 1780 } 1781out: 1782 return hiscore_idx; 1783} 1784 1785static int ipv6_get_saddr_master(struct net *net, 1786 const struct net_device *dst_dev, 1787 const struct net_device *master, 1788 struct ipv6_saddr_dst *dst, 1789 struct ipv6_saddr_score *scores, 1790 int hiscore_idx) 1791{ 1792 struct inet6_dev *idev; 1793 1794 idev = __in6_dev_get(dst_dev); 1795 if (idev) 1796 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev, 1797 scores, hiscore_idx); 1798 1799 idev = __in6_dev_get(master); 1800 if (idev) 1801 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev, 1802 scores, hiscore_idx); 1803 1804 return hiscore_idx; 1805} 1806 1807int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev, 1808 const struct in6_addr *daddr, unsigned int prefs, 1809 struct in6_addr *saddr) 1810{ 1811 struct ipv6_saddr_score scores[2], *hiscore; 1812 struct ipv6_saddr_dst dst; 1813 struct inet6_dev *idev; 1814 struct net_device *dev; 1815 int dst_type; 1816 bool use_oif_addr = false; 1817 int hiscore_idx = 0; 1818 int ret = 0; 1819 1820 dst_type = __ipv6_addr_type(daddr); 1821 dst.addr = daddr; 1822 dst.ifindex = dst_dev ? dst_dev->ifindex : 0; 1823 dst.scope = __ipv6_addr_src_scope(dst_type); 1824 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex); 1825 dst.prefs = prefs; 1826 1827 scores[hiscore_idx].rule = -1; 1828 scores[hiscore_idx].ifa = NULL; 1829 1830 rcu_read_lock(); 1831 1832 /* Candidate Source Address (section 4) 1833 * - multicast and link-local destination address, 1834 * the set of candidate source address MUST only 1835 * include addresses assigned to interfaces 1836 * belonging to the same link as the outgoing 1837 * interface. 1838 * (- For site-local destination addresses, the 1839 * set of candidate source addresses MUST only 1840 * include addresses assigned to interfaces 1841 * belonging to the same site as the outgoing 1842 * interface.) 1843 * - "It is RECOMMENDED that the candidate source addresses 1844 * be the set of unicast addresses assigned to the 1845 * interface that will be used to send to the destination 1846 * (the 'outgoing' interface)." (RFC 6724) 1847 */ 1848 if (dst_dev) { 1849 idev = __in6_dev_get(dst_dev); 1850 if ((dst_type & IPV6_ADDR_MULTICAST) || 1851 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL || 1852 (idev && READ_ONCE(idev->cnf.use_oif_addrs_only))) { 1853 use_oif_addr = true; 1854 } 1855 } 1856 1857 if (use_oif_addr) { 1858 if (idev) 1859 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx); 1860 } else { 1861 const struct net_device *master; 1862 int master_idx = 0; 1863 1864 /* if dst_dev exists and is enslaved to an L3 device, then 1865 * prefer addresses from dst_dev and then the master over 1866 * any other enslaved devices in the L3 domain. 1867 */ 1868 master = l3mdev_master_dev_rcu(dst_dev); 1869 if (master) { 1870 master_idx = master->ifindex; 1871 1872 hiscore_idx = ipv6_get_saddr_master(net, dst_dev, 1873 master, &dst, 1874 scores, hiscore_idx); 1875 1876 if (scores[hiscore_idx].ifa) 1877 goto out; 1878 } 1879 1880 for_each_netdev_rcu(net, dev) { 1881 /* only consider addresses on devices in the 1882 * same L3 domain 1883 */ 1884 if (l3mdev_master_ifindex_rcu(dev) != master_idx) 1885 continue; 1886 idev = __in6_dev_get(dev); 1887 if (!idev) 1888 continue; 1889 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx); 1890 } 1891 } 1892 1893out: 1894 hiscore = &scores[hiscore_idx]; 1895 if (!hiscore->ifa) 1896 ret = -EADDRNOTAVAIL; 1897 else 1898 *saddr = hiscore->ifa->addr; 1899 1900 rcu_read_unlock(); 1901 return ret; 1902} 1903EXPORT_SYMBOL(ipv6_dev_get_saddr); 1904 1905static int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr, 1906 u32 banned_flags) 1907{ 1908 struct inet6_ifaddr *ifp; 1909 int err = -EADDRNOTAVAIL; 1910 1911 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) { 1912 if (ifp->scope > IFA_LINK) 1913 break; 1914 if (ifp->scope == IFA_LINK && 1915 !(ifp->flags & banned_flags)) { 1916 *addr = ifp->addr; 1917 err = 0; 1918 break; 1919 } 1920 } 1921 return err; 1922} 1923 1924int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr, 1925 u32 banned_flags) 1926{ 1927 struct inet6_dev *idev; 1928 int err = -EADDRNOTAVAIL; 1929 1930 rcu_read_lock(); 1931 idev = __in6_dev_get(dev); 1932 if (idev) { 1933 read_lock_bh(&idev->lock); 1934 err = __ipv6_get_lladdr(idev, addr, banned_flags); 1935 read_unlock_bh(&idev->lock); 1936 } 1937 rcu_read_unlock(); 1938 return err; 1939} 1940 1941static int ipv6_count_addresses(const struct inet6_dev *idev) 1942{ 1943 const struct inet6_ifaddr *ifp; 1944 int cnt = 0; 1945 1946 rcu_read_lock(); 1947 list_for_each_entry_rcu(ifp, &idev->addr_list, if_list) 1948 cnt++; 1949 rcu_read_unlock(); 1950 return cnt; 1951} 1952 1953int ipv6_chk_addr(struct net *net, const struct in6_addr *addr, 1954 const struct net_device *dev, int strict) 1955{ 1956 return ipv6_chk_addr_and_flags(net, addr, dev, !dev, 1957 strict, IFA_F_TENTATIVE); 1958} 1959EXPORT_SYMBOL(ipv6_chk_addr); 1960 1961/* device argument is used to find the L3 domain of interest. If 1962 * skip_dev_check is set, then the ifp device is not checked against 1963 * the passed in dev argument. So the 2 cases for addresses checks are: 1964 * 1. does the address exist in the L3 domain that dev is part of 1965 * (skip_dev_check = true), or 1966 * 1967 * 2. does the address exist on the specific device 1968 * (skip_dev_check = false) 1969 */ 1970static struct net_device * 1971__ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr, 1972 const struct net_device *dev, bool skip_dev_check, 1973 int strict, u32 banned_flags) 1974{ 1975 unsigned int hash = inet6_addr_hash(net, addr); 1976 struct net_device *l3mdev, *ndev; 1977 struct inet6_ifaddr *ifp; 1978 u32 ifp_flags; 1979 1980 rcu_read_lock(); 1981 1982 l3mdev = l3mdev_master_dev_rcu(dev); 1983 if (skip_dev_check) 1984 dev = NULL; 1985 1986 hlist_for_each_entry_rcu(ifp, &net->ipv6.inet6_addr_lst[hash], addr_lst) { 1987 ndev = ifp->idev->dev; 1988 1989 if (l3mdev_master_dev_rcu(ndev) != l3mdev) 1990 continue; 1991 1992 /* Decouple optimistic from tentative for evaluation here. 1993 * Ban optimistic addresses explicitly, when required. 1994 */ 1995 ifp_flags = (ifp->flags&IFA_F_OPTIMISTIC) 1996 ? (ifp->flags&~IFA_F_TENTATIVE) 1997 : ifp->flags; 1998 if (ipv6_addr_equal(&ifp->addr, addr) && 1999 !(ifp_flags&banned_flags) && 2000 (!dev || ndev == dev || 2001 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) { 2002 rcu_read_unlock(); 2003 return ndev; 2004 } 2005 } 2006 2007 rcu_read_unlock(); 2008 return NULL; 2009} 2010 2011int ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr, 2012 const struct net_device *dev, bool skip_dev_check, 2013 int strict, u32 banned_flags) 2014{ 2015 return __ipv6_chk_addr_and_flags(net, addr, dev, skip_dev_check, 2016 strict, banned_flags) ? 1 : 0; 2017} 2018EXPORT_SYMBOL(ipv6_chk_addr_and_flags); 2019 2020 2021/* Compares an address/prefix_len with addresses on device @dev. 2022 * If one is found it returns true. 2023 */ 2024bool ipv6_chk_custom_prefix(const struct in6_addr *addr, 2025 const unsigned int prefix_len, struct net_device *dev) 2026{ 2027 const struct inet6_ifaddr *ifa; 2028 const struct inet6_dev *idev; 2029 bool ret = false; 2030 2031 rcu_read_lock(); 2032 idev = __in6_dev_get(dev); 2033 if (idev) { 2034 list_for_each_entry_rcu(ifa, &idev->addr_list, if_list) { 2035 ret = ipv6_prefix_equal(addr, &ifa->addr, prefix_len); 2036 if (ret) 2037 break; 2038 } 2039 } 2040 rcu_read_unlock(); 2041 2042 return ret; 2043} 2044EXPORT_SYMBOL(ipv6_chk_custom_prefix); 2045 2046int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev) 2047{ 2048 const struct inet6_ifaddr *ifa; 2049 const struct inet6_dev *idev; 2050 int onlink; 2051 2052 onlink = 0; 2053 rcu_read_lock(); 2054 idev = __in6_dev_get(dev); 2055 if (idev) { 2056 list_for_each_entry_rcu(ifa, &idev->addr_list, if_list) { 2057 onlink = ipv6_prefix_equal(addr, &ifa->addr, 2058 ifa->prefix_len); 2059 if (onlink) 2060 break; 2061 } 2062 } 2063 rcu_read_unlock(); 2064 return onlink; 2065} 2066EXPORT_SYMBOL(ipv6_chk_prefix); 2067 2068/** 2069 * ipv6_dev_find - find the first device with a given source address. 2070 * @net: the net namespace 2071 * @addr: the source address 2072 * @dev: used to find the L3 domain of interest 2073 * 2074 * The caller should be protected by RCU, or RTNL. 2075 */ 2076struct net_device *ipv6_dev_find(struct net *net, const struct in6_addr *addr, 2077 struct net_device *dev) 2078{ 2079 return __ipv6_chk_addr_and_flags(net, addr, dev, !dev, 1, 2080 IFA_F_TENTATIVE); 2081} 2082EXPORT_SYMBOL(ipv6_dev_find); 2083 2084struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr, 2085 struct net_device *dev, int strict) 2086{ 2087 unsigned int hash = inet6_addr_hash(net, addr); 2088 struct inet6_ifaddr *ifp, *result = NULL; 2089 2090 rcu_read_lock(); 2091 hlist_for_each_entry_rcu(ifp, &net->ipv6.inet6_addr_lst[hash], addr_lst) { 2092 if (ipv6_addr_equal(&ifp->addr, addr)) { 2093 if (!dev || ifp->idev->dev == dev || 2094 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) { 2095 if (in6_ifa_hold_safe(ifp)) { 2096 result = ifp; 2097 break; 2098 } 2099 } 2100 } 2101 } 2102 rcu_read_unlock(); 2103 2104 return result; 2105} 2106 2107/* Gets referenced address, destroys ifaddr */ 2108 2109static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed) 2110{ 2111 if (dad_failed) 2112 ifp->flags |= IFA_F_DADFAILED; 2113 2114 if (ifp->flags&IFA_F_TEMPORARY) { 2115 struct inet6_ifaddr *ifpub; 2116 spin_lock_bh(&ifp->lock); 2117 ifpub = ifp->ifpub; 2118 if (ifpub) { 2119 in6_ifa_hold(ifpub); 2120 spin_unlock_bh(&ifp->lock); 2121 ipv6_create_tempaddr(ifpub, true); 2122 in6_ifa_put(ifpub); 2123 } else { 2124 spin_unlock_bh(&ifp->lock); 2125 } 2126 ipv6_del_addr(ifp); 2127 } else if (ifp->flags&IFA_F_PERMANENT || !dad_failed) { 2128 spin_lock_bh(&ifp->lock); 2129 addrconf_del_dad_work(ifp); 2130 ifp->flags |= IFA_F_TENTATIVE; 2131 if (dad_failed) 2132 ifp->flags &= ~IFA_F_OPTIMISTIC; 2133 spin_unlock_bh(&ifp->lock); 2134 if (dad_failed) 2135 ipv6_ifa_notify(0, ifp); 2136 in6_ifa_put(ifp); 2137 } else { 2138 ipv6_del_addr(ifp); 2139 } 2140} 2141 2142static int addrconf_dad_end(struct inet6_ifaddr *ifp) 2143{ 2144 int err = -ENOENT; 2145 2146 spin_lock_bh(&ifp->lock); 2147 if (ifp->state == INET6_IFADDR_STATE_DAD) { 2148 ifp->state = INET6_IFADDR_STATE_POSTDAD; 2149 err = 0; 2150 } 2151 spin_unlock_bh(&ifp->lock); 2152 2153 return err; 2154} 2155 2156void addrconf_dad_failure(struct sk_buff *skb, struct inet6_ifaddr *ifp) 2157{ 2158 struct inet6_dev *idev = ifp->idev; 2159 struct net *net = dev_net(idev->dev); 2160 int max_addresses; 2161 2162 if (addrconf_dad_end(ifp)) { 2163 in6_ifa_put(ifp); 2164 return; 2165 } 2166 2167 net_info_ratelimited("%s: IPv6 duplicate address %pI6c used by %pM detected!\n", 2168 ifp->idev->dev->name, &ifp->addr, eth_hdr(skb)->h_source); 2169 2170 spin_lock_bh(&ifp->lock); 2171 2172 if (ifp->flags & IFA_F_STABLE_PRIVACY) { 2173 struct in6_addr new_addr; 2174 struct inet6_ifaddr *ifp2; 2175 int retries = ifp->stable_privacy_retry + 1; 2176 struct ifa6_config cfg = { 2177 .pfx = &new_addr, 2178 .plen = ifp->prefix_len, 2179 .ifa_flags = ifp->flags, 2180 .valid_lft = ifp->valid_lft, 2181 .preferred_lft = ifp->prefered_lft, 2182 .scope = ifp->scope, 2183 }; 2184 2185 if (retries > net->ipv6.sysctl.idgen_retries) { 2186 net_info_ratelimited("%s: privacy stable address generation failed because of DAD conflicts!\n", 2187 ifp->idev->dev->name); 2188 goto errdad; 2189 } 2190 2191 new_addr = ifp->addr; 2192 if (ipv6_generate_stable_address(&new_addr, retries, 2193 idev)) 2194 goto errdad; 2195 2196 spin_unlock_bh(&ifp->lock); 2197 2198 max_addresses = READ_ONCE(idev->cnf.max_addresses); 2199 if (max_addresses && 2200 ipv6_count_addresses(idev) >= max_addresses) 2201 goto lock_errdad; 2202 2203 net_info_ratelimited("%s: generating new stable privacy address because of DAD conflict\n", 2204 ifp->idev->dev->name); 2205 2206 ifp2 = ipv6_add_addr(idev, &cfg, false, NULL); 2207 if (IS_ERR(ifp2)) 2208 goto lock_errdad; 2209 2210 spin_lock_bh(&ifp2->lock); 2211 ifp2->stable_privacy_retry = retries; 2212 ifp2->state = INET6_IFADDR_STATE_PREDAD; 2213 spin_unlock_bh(&ifp2->lock); 2214 2215 addrconf_mod_dad_work(ifp2, net->ipv6.sysctl.idgen_delay); 2216 in6_ifa_put(ifp2); 2217lock_errdad: 2218 spin_lock_bh(&ifp->lock); 2219 } 2220 2221errdad: 2222 /* transition from _POSTDAD to _ERRDAD */ 2223 ifp->state = INET6_IFADDR_STATE_ERRDAD; 2224 spin_unlock_bh(&ifp->lock); 2225 2226 addrconf_mod_dad_work(ifp, 0); 2227 in6_ifa_put(ifp); 2228} 2229 2230/* Join to solicited addr multicast group. 2231 * caller must hold RTNL */ 2232void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr) 2233{ 2234 struct in6_addr maddr; 2235 2236 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP)) 2237 return; 2238 2239 addrconf_addr_solict_mult(addr, &maddr); 2240 ipv6_dev_mc_inc(dev, &maddr); 2241} 2242 2243/* caller must hold RTNL */ 2244void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr) 2245{ 2246 struct in6_addr maddr; 2247 2248 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP)) 2249 return; 2250 2251 addrconf_addr_solict_mult(addr, &maddr); 2252 __ipv6_dev_mc_dec(idev, &maddr); 2253} 2254 2255/* caller must hold RTNL */ 2256static void addrconf_join_anycast(struct inet6_ifaddr *ifp) 2257{ 2258 struct in6_addr addr; 2259 2260 if (ifp->prefix_len >= 127) /* RFC 6164 */ 2261 return; 2262 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len); 2263 if (ipv6_addr_any(&addr)) 2264 return; 2265 __ipv6_dev_ac_inc(ifp->idev, &addr); 2266} 2267 2268/* caller must hold RTNL */ 2269static void addrconf_leave_anycast(struct inet6_ifaddr *ifp) 2270{ 2271 struct in6_addr addr; 2272 2273 if (ifp->prefix_len >= 127) /* RFC 6164 */ 2274 return; 2275 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len); 2276 if (ipv6_addr_any(&addr)) 2277 return; 2278 __ipv6_dev_ac_dec(ifp->idev, &addr); 2279} 2280 2281static int addrconf_ifid_6lowpan(u8 *eui, struct net_device *dev) 2282{ 2283 switch (dev->addr_len) { 2284 case ETH_ALEN: 2285 memcpy(eui, dev->dev_addr, 3); 2286 eui[3] = 0xFF; 2287 eui[4] = 0xFE; 2288 memcpy(eui + 5, dev->dev_addr + 3, 3); 2289 break; 2290 case EUI64_ADDR_LEN: 2291 memcpy(eui, dev->dev_addr, EUI64_ADDR_LEN); 2292 eui[0] ^= 2; 2293 break; 2294 default: 2295 return -1; 2296 } 2297 2298 return 0; 2299} 2300 2301static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev) 2302{ 2303 const union fwnet_hwaddr *ha; 2304 2305 if (dev->addr_len != FWNET_ALEN) 2306 return -1; 2307 2308 ha = (const union fwnet_hwaddr *)dev->dev_addr; 2309 2310 memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id)); 2311 eui[0] ^= 2; 2312 return 0; 2313} 2314 2315static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev) 2316{ 2317 /* XXX: inherit EUI-64 from other interface -- yoshfuji */ 2318 if (dev->addr_len != ARCNET_ALEN) 2319 return -1; 2320 memset(eui, 0, 7); 2321 eui[7] = *(u8 *)dev->dev_addr; 2322 return 0; 2323} 2324 2325static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev) 2326{ 2327 if (dev->addr_len != INFINIBAND_ALEN) 2328 return -1; 2329 memcpy(eui, dev->dev_addr + 12, 8); 2330 eui[0] |= 2; 2331 return 0; 2332} 2333 2334static int __ipv6_isatap_ifid(u8 *eui, __be32 addr) 2335{ 2336 if (addr == 0) 2337 return -1; 2338 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) || 2339 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) || 2340 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) || 2341 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) || 2342 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) || 2343 ipv4_is_lbcast(addr)) ? 0x00 : 0x02; 2344 eui[1] = 0; 2345 eui[2] = 0x5E; 2346 eui[3] = 0xFE; 2347 memcpy(eui + 4, &addr, 4); 2348 return 0; 2349} 2350 2351static int addrconf_ifid_sit(u8 *eui, struct net_device *dev) 2352{ 2353 if (dev->priv_flags & IFF_ISATAP) 2354 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr); 2355 return -1; 2356} 2357 2358static int addrconf_ifid_gre(u8 *eui, struct net_device *dev) 2359{ 2360 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr); 2361} 2362 2363static int addrconf_ifid_ip6tnl(u8 *eui, struct net_device *dev) 2364{ 2365 memcpy(eui, dev->perm_addr, 3); 2366 memcpy(eui + 5, dev->perm_addr + 3, 3); 2367 eui[3] = 0xFF; 2368 eui[4] = 0xFE; 2369 eui[0] ^= 2; 2370 return 0; 2371} 2372 2373static int ipv6_generate_eui64(u8 *eui, struct net_device *dev) 2374{ 2375 switch (dev->type) { 2376 case ARPHRD_ETHER: 2377 case ARPHRD_FDDI: 2378 return addrconf_ifid_eui48(eui, dev); 2379 case ARPHRD_ARCNET: 2380 return addrconf_ifid_arcnet(eui, dev); 2381 case ARPHRD_INFINIBAND: 2382 return addrconf_ifid_infiniband(eui, dev); 2383 case ARPHRD_SIT: 2384 return addrconf_ifid_sit(eui, dev); 2385 case ARPHRD_IPGRE: 2386 case ARPHRD_TUNNEL: 2387 return addrconf_ifid_gre(eui, dev); 2388 case ARPHRD_6LOWPAN: 2389 return addrconf_ifid_6lowpan(eui, dev); 2390 case ARPHRD_IEEE1394: 2391 return addrconf_ifid_ieee1394(eui, dev); 2392 case ARPHRD_TUNNEL6: 2393 case ARPHRD_IP6GRE: 2394 case ARPHRD_RAWIP: 2395 return addrconf_ifid_ip6tnl(eui, dev); 2396 } 2397 return -1; 2398} 2399 2400static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev) 2401{ 2402 int err = -1; 2403 struct inet6_ifaddr *ifp; 2404 2405 read_lock_bh(&idev->lock); 2406 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) { 2407 if (ifp->scope > IFA_LINK) 2408 break; 2409 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) { 2410 memcpy(eui, ifp->addr.s6_addr+8, 8); 2411 err = 0; 2412 break; 2413 } 2414 } 2415 read_unlock_bh(&idev->lock); 2416 return err; 2417} 2418 2419/* Generation of a randomized Interface Identifier 2420 * draft-ietf-6man-rfc4941bis, Section 3.3.1 2421 */ 2422 2423static void ipv6_gen_rnd_iid(struct in6_addr *addr) 2424{ 2425regen: 2426 get_random_bytes(&addr->s6_addr[8], 8); 2427 2428 /* <draft-ietf-6man-rfc4941bis-08.txt>, Section 3.3.1: 2429 * check if generated address is not inappropriate: 2430 * 2431 * - Reserved IPv6 Interface Identifiers 2432 * - XXX: already assigned to an address on the device 2433 */ 2434 2435 /* Subnet-router anycast: 0000:0000:0000:0000 */ 2436 if (!(addr->s6_addr32[2] | addr->s6_addr32[3])) 2437 goto regen; 2438 2439 /* IANA Ethernet block: 0200:5EFF:FE00:0000-0200:5EFF:FE00:5212 2440 * Proxy Mobile IPv6: 0200:5EFF:FE00:5213 2441 * IANA Ethernet block: 0200:5EFF:FE00:5214-0200:5EFF:FEFF:FFFF 2442 */ 2443 if (ntohl(addr->s6_addr32[2]) == 0x02005eff && 2444 (ntohl(addr->s6_addr32[3]) & 0Xff000000) == 0xfe000000) 2445 goto regen; 2446 2447 /* Reserved subnet anycast addresses */ 2448 if (ntohl(addr->s6_addr32[2]) == 0xfdffffff && 2449 ntohl(addr->s6_addr32[3]) >= 0Xffffff80) 2450 goto regen; 2451} 2452 2453/* 2454 * Add prefix route. 2455 */ 2456 2457static void 2458addrconf_prefix_route(struct in6_addr *pfx, int plen, u32 metric, 2459 struct net_device *dev, unsigned long expires, 2460 u32 flags, gfp_t gfp_flags) 2461{ 2462 struct fib6_config cfg = { 2463 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX, 2464 .fc_metric = metric ? : IP6_RT_PRIO_ADDRCONF, 2465 .fc_ifindex = dev->ifindex, 2466 .fc_expires = expires, 2467 .fc_dst_len = plen, 2468 .fc_flags = RTF_UP | flags, 2469 .fc_nlinfo.nl_net = dev_net(dev), 2470 .fc_protocol = RTPROT_KERNEL, 2471 .fc_type = RTN_UNICAST, 2472 }; 2473 2474 cfg.fc_dst = *pfx; 2475 2476 /* Prevent useless cloning on PtP SIT. 2477 This thing is done here expecting that the whole 2478 class of non-broadcast devices need not cloning. 2479 */ 2480#if IS_ENABLED(CONFIG_IPV6_SIT) 2481 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT)) 2482 cfg.fc_flags |= RTF_NONEXTHOP; 2483#endif 2484 2485 ip6_route_add(&cfg, gfp_flags, NULL); 2486} 2487 2488 2489static struct fib6_info *addrconf_get_prefix_route(const struct in6_addr *pfx, 2490 int plen, 2491 const struct net_device *dev, 2492 u32 flags, u32 noflags, 2493 bool no_gw) 2494{ 2495 struct fib6_node *fn; 2496 struct fib6_info *rt = NULL; 2497 struct fib6_table *table; 2498 u32 tb_id = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX; 2499 2500 table = fib6_get_table(dev_net(dev), tb_id); 2501 if (!table) 2502 return NULL; 2503 2504 rcu_read_lock(); 2505 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0, true); 2506 if (!fn) 2507 goto out; 2508 2509 for_each_fib6_node_rt_rcu(fn) { 2510 /* prefix routes only use builtin fib6_nh */ 2511 if (rt->nh) 2512 continue; 2513 2514 if (rt->fib6_nh->fib_nh_dev->ifindex != dev->ifindex) 2515 continue; 2516 if (no_gw && rt->fib6_nh->fib_nh_gw_family) 2517 continue; 2518 if ((rt->fib6_flags & flags) != flags) 2519 continue; 2520 if ((rt->fib6_flags & noflags) != 0) 2521 continue; 2522 if (!fib6_info_hold_safe(rt)) 2523 continue; 2524 break; 2525 } 2526out: 2527 rcu_read_unlock(); 2528 return rt; 2529} 2530 2531 2532/* Create "default" multicast route to the interface */ 2533 2534static void addrconf_add_mroute(struct net_device *dev) 2535{ 2536 struct fib6_config cfg = { 2537 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_LOCAL, 2538 .fc_metric = IP6_RT_PRIO_ADDRCONF, 2539 .fc_ifindex = dev->ifindex, 2540 .fc_dst_len = 8, 2541 .fc_flags = RTF_UP, 2542 .fc_type = RTN_MULTICAST, 2543 .fc_nlinfo.nl_net = dev_net(dev), 2544 .fc_protocol = RTPROT_KERNEL, 2545 }; 2546 2547 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0); 2548 2549 ip6_route_add(&cfg, GFP_KERNEL, NULL); 2550} 2551 2552static struct inet6_dev *addrconf_add_dev(struct net_device *dev) 2553{ 2554 struct inet6_dev *idev; 2555 2556 ASSERT_RTNL(); 2557 2558 idev = ipv6_find_idev(dev); 2559 if (IS_ERR(idev)) 2560 return idev; 2561 2562 if (idev->cnf.disable_ipv6) 2563 return ERR_PTR(-EACCES); 2564 2565 /* Add default multicast route */ 2566 if (!(dev->flags & IFF_LOOPBACK) && !netif_is_l3_master(dev)) 2567 addrconf_add_mroute(dev); 2568 2569 return idev; 2570} 2571 2572static void manage_tempaddrs(struct inet6_dev *idev, 2573 struct inet6_ifaddr *ifp, 2574 __u32 valid_lft, __u32 prefered_lft, 2575 bool create, unsigned long now) 2576{ 2577 u32 flags; 2578 struct inet6_ifaddr *ift; 2579 2580 read_lock_bh(&idev->lock); 2581 /* update all temporary addresses in the list */ 2582 list_for_each_entry(ift, &idev->tempaddr_list, tmp_list) { 2583 int age, max_valid, max_prefered; 2584 2585 if (ifp != ift->ifpub) 2586 continue; 2587 2588 /* RFC 4941 section 3.3: 2589 * If a received option will extend the lifetime of a public 2590 * address, the lifetimes of temporary addresses should 2591 * be extended, subject to the overall constraint that no 2592 * temporary addresses should ever remain "valid" or "preferred" 2593 * for a time longer than (TEMP_VALID_LIFETIME) or 2594 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), respectively. 2595 */ 2596 age = (now - ift->cstamp) / HZ; 2597 max_valid = READ_ONCE(idev->cnf.temp_valid_lft) - age; 2598 if (max_valid < 0) 2599 max_valid = 0; 2600 2601 max_prefered = READ_ONCE(idev->cnf.temp_prefered_lft) - 2602 idev->desync_factor - age; 2603 if (max_prefered < 0) 2604 max_prefered = 0; 2605 2606 if (valid_lft > max_valid) 2607 valid_lft = max_valid; 2608 2609 if (prefered_lft > max_prefered) 2610 prefered_lft = max_prefered; 2611 2612 spin_lock(&ift->lock); 2613 flags = ift->flags; 2614 ift->valid_lft = valid_lft; 2615 ift->prefered_lft = prefered_lft; 2616 ift->tstamp = now; 2617 if (prefered_lft > 0) 2618 ift->flags &= ~IFA_F_DEPRECATED; 2619 2620 spin_unlock(&ift->lock); 2621 if (!(flags&IFA_F_TENTATIVE)) 2622 ipv6_ifa_notify(0, ift); 2623 } 2624 2625 /* Also create a temporary address if it's enabled but no temporary 2626 * address currently exists. 2627 * However, we get called with valid_lft == 0, prefered_lft == 0, create == false 2628 * as part of cleanup (ie. deleting the mngtmpaddr). 2629 * We don't want that to result in creating a new temporary ip address. 2630 */ 2631 if (list_empty(&idev->tempaddr_list) && (valid_lft || prefered_lft)) 2632 create = true; 2633 2634 if (create && READ_ONCE(idev->cnf.use_tempaddr) > 0) { 2635 /* When a new public address is created as described 2636 * in [ADDRCONF], also create a new temporary address. 2637 */ 2638 read_unlock_bh(&idev->lock); 2639 ipv6_create_tempaddr(ifp, false); 2640 } else { 2641 read_unlock_bh(&idev->lock); 2642 } 2643} 2644 2645static bool is_addr_mode_generate_stable(struct inet6_dev *idev) 2646{ 2647 return idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY || 2648 idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_RANDOM; 2649} 2650 2651int addrconf_prefix_rcv_add_addr(struct net *net, struct net_device *dev, 2652 const struct prefix_info *pinfo, 2653 struct inet6_dev *in6_dev, 2654 const struct in6_addr *addr, int addr_type, 2655 u32 addr_flags, bool sllao, bool tokenized, 2656 __u32 valid_lft, u32 prefered_lft) 2657{ 2658 struct inet6_ifaddr *ifp = ipv6_get_ifaddr(net, addr, dev, 1); 2659 int create = 0, update_lft = 0; 2660 2661 if (!ifp && valid_lft) { 2662 int max_addresses = READ_ONCE(in6_dev->cnf.max_addresses); 2663 struct ifa6_config cfg = { 2664 .pfx = addr, 2665 .plen = pinfo->prefix_len, 2666 .ifa_flags = addr_flags, 2667 .valid_lft = valid_lft, 2668 .preferred_lft = prefered_lft, 2669 .scope = addr_type & IPV6_ADDR_SCOPE_MASK, 2670 .ifa_proto = IFAPROT_KERNEL_RA 2671 }; 2672 2673#ifdef CONFIG_IPV6_OPTIMISTIC_DAD 2674 if ((READ_ONCE(net->ipv6.devconf_all->optimistic_dad) || 2675 READ_ONCE(in6_dev->cnf.optimistic_dad)) && 2676 !net->ipv6.devconf_all->forwarding && sllao) 2677 cfg.ifa_flags |= IFA_F_OPTIMISTIC; 2678#endif 2679 2680 /* Do not allow to create too much of autoconfigured 2681 * addresses; this would be too easy way to crash kernel. 2682 */ 2683 if (!max_addresses || 2684 ipv6_count_addresses(in6_dev) < max_addresses) 2685 ifp = ipv6_add_addr(in6_dev, &cfg, false, NULL); 2686 2687 if (IS_ERR_OR_NULL(ifp)) 2688 return -1; 2689 2690 create = 1; 2691 spin_lock_bh(&ifp->lock); 2692 ifp->flags |= IFA_F_MANAGETEMPADDR; 2693 ifp->cstamp = jiffies; 2694 ifp->tokenized = tokenized; 2695 spin_unlock_bh(&ifp->lock); 2696 addrconf_dad_start(ifp); 2697 } 2698 2699 if (ifp) { 2700 u32 flags; 2701 unsigned long now; 2702 u32 stored_lft; 2703 2704 /* update lifetime (RFC2462 5.5.3 e) */ 2705 spin_lock_bh(&ifp->lock); 2706 now = jiffies; 2707 if (ifp->valid_lft > (now - ifp->tstamp) / HZ) 2708 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ; 2709 else 2710 stored_lft = 0; 2711 2712 /* RFC4862 Section 5.5.3e: 2713 * "Note that the preferred lifetime of the 2714 * corresponding address is always reset to 2715 * the Preferred Lifetime in the received 2716 * Prefix Information option, regardless of 2717 * whether the valid lifetime is also reset or 2718 * ignored." 2719 * 2720 * So we should always update prefered_lft here. 2721 */ 2722 update_lft = !create && stored_lft; 2723 2724 if (update_lft && !READ_ONCE(in6_dev->cnf.ra_honor_pio_life)) { 2725 const u32 minimum_lft = min_t(u32, 2726 stored_lft, MIN_VALID_LIFETIME); 2727 valid_lft = max(valid_lft, minimum_lft); 2728 } 2729 2730 if (update_lft) { 2731 ifp->valid_lft = valid_lft; 2732 ifp->prefered_lft = prefered_lft; 2733 WRITE_ONCE(ifp->tstamp, now); 2734 flags = ifp->flags; 2735 ifp->flags &= ~IFA_F_DEPRECATED; 2736 spin_unlock_bh(&ifp->lock); 2737 2738 if (!(flags&IFA_F_TENTATIVE)) 2739 ipv6_ifa_notify(0, ifp); 2740 } else 2741 spin_unlock_bh(&ifp->lock); 2742 2743 manage_tempaddrs(in6_dev, ifp, valid_lft, prefered_lft, 2744 create, now); 2745 2746 in6_ifa_put(ifp); 2747 addrconf_verify(net); 2748 } 2749 2750 return 0; 2751} 2752EXPORT_SYMBOL_GPL(addrconf_prefix_rcv_add_addr); 2753 2754void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao) 2755{ 2756 struct prefix_info *pinfo; 2757 struct fib6_table *table; 2758 __u32 valid_lft; 2759 __u32 prefered_lft; 2760 int addr_type, err; 2761 u32 addr_flags = 0; 2762 struct inet6_dev *in6_dev; 2763 struct net *net = dev_net(dev); 2764 2765 pinfo = (struct prefix_info *) opt; 2766 2767 if (len < sizeof(struct prefix_info)) { 2768 netdev_dbg(dev, "addrconf: prefix option too short\n"); 2769 return; 2770 } 2771 2772 /* 2773 * Validation checks ([ADDRCONF], page 19) 2774 */ 2775 2776 addr_type = ipv6_addr_type(&pinfo->prefix); 2777 2778 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL)) 2779 return; 2780 2781 valid_lft = ntohl(pinfo->valid); 2782 prefered_lft = ntohl(pinfo->prefered); 2783 2784 if (prefered_lft > valid_lft) { 2785 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n"); 2786 return; 2787 } 2788 2789 in6_dev = in6_dev_get(dev); 2790 2791 if (!in6_dev) { 2792 net_dbg_ratelimited("addrconf: device %s not configured\n", 2793 dev->name); 2794 return; 2795 } 2796 2797 if (valid_lft != 0 && valid_lft < in6_dev->cnf.accept_ra_min_lft) 2798 goto put; 2799 2800 /* 2801 * Two things going on here: 2802 * 1) Add routes for on-link prefixes 2803 * 2) Configure prefixes with the auto flag set 2804 */ 2805 2806 if (pinfo->onlink) { 2807 struct fib6_info *rt; 2808 unsigned long rt_expires; 2809 2810 /* Avoid arithmetic overflow. Really, we could 2811 * save rt_expires in seconds, likely valid_lft, 2812 * but it would require division in fib gc, that it 2813 * not good. 2814 */ 2815 if (HZ > USER_HZ) 2816 rt_expires = addrconf_timeout_fixup(valid_lft, HZ); 2817 else 2818 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ); 2819 2820 if (addrconf_finite_timeout(rt_expires)) 2821 rt_expires *= HZ; 2822 2823 rt = addrconf_get_prefix_route(&pinfo->prefix, 2824 pinfo->prefix_len, 2825 dev, 2826 RTF_ADDRCONF | RTF_PREFIX_RT, 2827 RTF_DEFAULT, true); 2828 2829 if (rt) { 2830 /* Autoconf prefix route */ 2831 if (valid_lft == 0) { 2832 ip6_del_rt(net, rt, false); 2833 rt = NULL; 2834 } else { 2835 table = rt->fib6_table; 2836 spin_lock_bh(&table->tb6_lock); 2837 2838 if (addrconf_finite_timeout(rt_expires)) { 2839 /* not infinity */ 2840 fib6_set_expires(rt, jiffies + rt_expires); 2841 fib6_add_gc_list(rt); 2842 } else { 2843 fib6_clean_expires(rt); 2844 fib6_remove_gc_list(rt); 2845 } 2846 2847 spin_unlock_bh(&table->tb6_lock); 2848 } 2849 } else if (valid_lft) { 2850 clock_t expires = 0; 2851 int flags = RTF_ADDRCONF | RTF_PREFIX_RT; 2852 if (addrconf_finite_timeout(rt_expires)) { 2853 /* not infinity */ 2854 flags |= RTF_EXPIRES; 2855 expires = jiffies_to_clock_t(rt_expires); 2856 } 2857 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len, 2858 0, dev, expires, flags, 2859 GFP_ATOMIC); 2860 } 2861 fib6_info_release(rt); 2862 } 2863 2864 /* Try to figure out our local address for this prefix */ 2865 2866 if (pinfo->autoconf && in6_dev->cnf.autoconf) { 2867 struct in6_addr addr; 2868 bool tokenized = false, dev_addr_generated = false; 2869 2870 if (pinfo->prefix_len == 64) { 2871 memcpy(&addr, &pinfo->prefix, 8); 2872 2873 if (!ipv6_addr_any(&in6_dev->token)) { 2874 read_lock_bh(&in6_dev->lock); 2875 memcpy(addr.s6_addr + 8, 2876 in6_dev->token.s6_addr + 8, 8); 2877 read_unlock_bh(&in6_dev->lock); 2878 tokenized = true; 2879 } else if (is_addr_mode_generate_stable(in6_dev) && 2880 !ipv6_generate_stable_address(&addr, 0, 2881 in6_dev)) { 2882 addr_flags |= IFA_F_STABLE_PRIVACY; 2883 goto ok; 2884 } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) && 2885 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) { 2886 goto put; 2887 } else { 2888 dev_addr_generated = true; 2889 } 2890 goto ok; 2891 } 2892 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n", 2893 pinfo->prefix_len); 2894 goto put; 2895 2896ok: 2897 err = addrconf_prefix_rcv_add_addr(net, dev, pinfo, in6_dev, 2898 &addr, addr_type, 2899 addr_flags, sllao, 2900 tokenized, valid_lft, 2901 prefered_lft); 2902 if (err) 2903 goto put; 2904 2905 /* Ignore error case here because previous prefix add addr was 2906 * successful which will be notified. 2907 */ 2908 ndisc_ops_prefix_rcv_add_addr(net, dev, pinfo, in6_dev, &addr, 2909 addr_type, addr_flags, sllao, 2910 tokenized, valid_lft, 2911 prefered_lft, 2912 dev_addr_generated); 2913 } 2914 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo); 2915put: 2916 in6_dev_put(in6_dev); 2917} 2918 2919static int addrconf_set_sit_dstaddr(struct net *net, struct net_device *dev, 2920 struct in6_ifreq *ireq) 2921{ 2922 struct ip_tunnel_parm_kern p = { }; 2923 int err; 2924 2925 if (!(ipv6_addr_type(&ireq->ifr6_addr) & IPV6_ADDR_COMPATv4)) 2926 return -EADDRNOTAVAIL; 2927 2928 p.iph.daddr = ireq->ifr6_addr.s6_addr32[3]; 2929 p.iph.version = 4; 2930 p.iph.ihl = 5; 2931 p.iph.protocol = IPPROTO_IPV6; 2932 p.iph.ttl = 64; 2933 2934 if (!dev->netdev_ops->ndo_tunnel_ctl) 2935 return -EOPNOTSUPP; 2936 err = dev->netdev_ops->ndo_tunnel_ctl(dev, &p, SIOCADDTUNNEL); 2937 if (err) 2938 return err; 2939 2940 dev = __dev_get_by_name(net, p.name); 2941 if (!dev) 2942 return -ENOBUFS; 2943 return dev_open(dev, NULL); 2944} 2945 2946/* 2947 * Set destination address. 2948 * Special case for SIT interfaces where we create a new "virtual" 2949 * device. 2950 */ 2951int addrconf_set_dstaddr(struct net *net, void __user *arg) 2952{ 2953 struct net_device *dev; 2954 struct in6_ifreq ireq; 2955 int err = -ENODEV; 2956 2957 if (!IS_ENABLED(CONFIG_IPV6_SIT)) 2958 return -ENODEV; 2959 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2960 return -EFAULT; 2961 2962 rtnl_lock(); 2963 dev = __dev_get_by_index(net, ireq.ifr6_ifindex); 2964 if (dev && dev->type == ARPHRD_SIT) 2965 err = addrconf_set_sit_dstaddr(net, dev, &ireq); 2966 rtnl_unlock(); 2967 return err; 2968} 2969 2970static int ipv6_mc_config(struct sock *sk, bool join, 2971 const struct in6_addr *addr, int ifindex) 2972{ 2973 int ret; 2974 2975 ASSERT_RTNL(); 2976 2977 lock_sock(sk); 2978 if (join) 2979 ret = ipv6_sock_mc_join(sk, ifindex, addr); 2980 else 2981 ret = ipv6_sock_mc_drop(sk, ifindex, addr); 2982 release_sock(sk); 2983 2984 return ret; 2985} 2986 2987/* 2988 * Manual configuration of address on an interface 2989 */ 2990static int inet6_addr_add(struct net *net, int ifindex, 2991 struct ifa6_config *cfg, 2992 struct netlink_ext_ack *extack) 2993{ 2994 struct inet6_ifaddr *ifp; 2995 struct inet6_dev *idev; 2996 struct net_device *dev; 2997 unsigned long timeout; 2998 clock_t expires; 2999 u32 flags; 3000 3001 ASSERT_RTNL(); 3002 3003 if (cfg->plen > 128) { 3004 NL_SET_ERR_MSG_MOD(extack, "Invalid prefix length"); 3005 return -EINVAL; 3006 } 3007 3008 /* check the lifetime */ 3009 if (!cfg->valid_lft || cfg->preferred_lft > cfg->valid_lft) { 3010 NL_SET_ERR_MSG_MOD(extack, "address lifetime invalid"); 3011 return -EINVAL; 3012 } 3013 3014 if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR && cfg->plen != 64) { 3015 NL_SET_ERR_MSG_MOD(extack, "address with \"mngtmpaddr\" flag must have a prefix length of 64"); 3016 return -EINVAL; 3017 } 3018 3019 dev = __dev_get_by_index(net, ifindex); 3020 if (!dev) 3021 return -ENODEV; 3022 3023 idev = addrconf_add_dev(dev); 3024 if (IS_ERR(idev)) { 3025 NL_SET_ERR_MSG_MOD(extack, "IPv6 is disabled on this device"); 3026 return PTR_ERR(idev); 3027 } 3028 3029 if (cfg->ifa_flags & IFA_F_MCAUTOJOIN) { 3030 int ret = ipv6_mc_config(net->ipv6.mc_autojoin_sk, 3031 true, cfg->pfx, ifindex); 3032 3033 if (ret < 0) { 3034 NL_SET_ERR_MSG_MOD(extack, "Multicast auto join failed"); 3035 return ret; 3036 } 3037 } 3038 3039 cfg->scope = ipv6_addr_scope(cfg->pfx); 3040 3041 timeout = addrconf_timeout_fixup(cfg->valid_lft, HZ); 3042 if (addrconf_finite_timeout(timeout)) { 3043 expires = jiffies_to_clock_t(timeout * HZ); 3044 cfg->valid_lft = timeout; 3045 flags = RTF_EXPIRES; 3046 } else { 3047 expires = 0; 3048 flags = 0; 3049 cfg->ifa_flags |= IFA_F_PERMANENT; 3050 } 3051 3052 timeout = addrconf_timeout_fixup(cfg->preferred_lft, HZ); 3053 if (addrconf_finite_timeout(timeout)) { 3054 if (timeout == 0) 3055 cfg->ifa_flags |= IFA_F_DEPRECATED; 3056 cfg->preferred_lft = timeout; 3057 } 3058 3059 ifp = ipv6_add_addr(idev, cfg, true, extack); 3060 if (!IS_ERR(ifp)) { 3061 if (!(cfg->ifa_flags & IFA_F_NOPREFIXROUTE)) { 3062 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, 3063 ifp->rt_priority, dev, expires, 3064 flags, GFP_KERNEL); 3065 } 3066 3067 /* Send a netlink notification if DAD is enabled and 3068 * optimistic flag is not set 3069 */ 3070 if (!(ifp->flags & (IFA_F_OPTIMISTIC | IFA_F_NODAD))) 3071 ipv6_ifa_notify(0, ifp); 3072 /* 3073 * Note that section 3.1 of RFC 4429 indicates 3074 * that the Optimistic flag should not be set for 3075 * manually configured addresses 3076 */ 3077 addrconf_dad_start(ifp); 3078 if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR) 3079 manage_tempaddrs(idev, ifp, cfg->valid_lft, 3080 cfg->preferred_lft, true, jiffies); 3081 in6_ifa_put(ifp); 3082 addrconf_verify_rtnl(net); 3083 return 0; 3084 } else if (cfg->ifa_flags & IFA_F_MCAUTOJOIN) { 3085 ipv6_mc_config(net->ipv6.mc_autojoin_sk, false, 3086 cfg->pfx, ifindex); 3087 } 3088 3089 return PTR_ERR(ifp); 3090} 3091 3092static int inet6_addr_del(struct net *net, int ifindex, u32 ifa_flags, 3093 const struct in6_addr *pfx, unsigned int plen, 3094 struct netlink_ext_ack *extack) 3095{ 3096 struct inet6_ifaddr *ifp; 3097 struct inet6_dev *idev; 3098 struct net_device *dev; 3099 3100 if (plen > 128) { 3101 NL_SET_ERR_MSG_MOD(extack, "Invalid prefix length"); 3102 return -EINVAL; 3103 } 3104 3105 dev = __dev_get_by_index(net, ifindex); 3106 if (!dev) { 3107 NL_SET_ERR_MSG_MOD(extack, "Unable to find the interface"); 3108 return -ENODEV; 3109 } 3110 3111 idev = __in6_dev_get(dev); 3112 if (!idev) { 3113 NL_SET_ERR_MSG_MOD(extack, "IPv6 is disabled on this device"); 3114 return -ENXIO; 3115 } 3116 3117 read_lock_bh(&idev->lock); 3118 list_for_each_entry(ifp, &idev->addr_list, if_list) { 3119 if (ifp->prefix_len == plen && 3120 ipv6_addr_equal(pfx, &ifp->addr)) { 3121 in6_ifa_hold(ifp); 3122 read_unlock_bh(&idev->lock); 3123 3124 if (!(ifp->flags & IFA_F_TEMPORARY) && 3125 (ifa_flags & IFA_F_MANAGETEMPADDR)) 3126 manage_tempaddrs(idev, ifp, 0, 0, false, 3127 jiffies); 3128 ipv6_del_addr(ifp); 3129 addrconf_verify_rtnl(net); 3130 if (ipv6_addr_is_multicast(pfx)) { 3131 ipv6_mc_config(net->ipv6.mc_autojoin_sk, 3132 false, pfx, dev->ifindex); 3133 } 3134 return 0; 3135 } 3136 } 3137 read_unlock_bh(&idev->lock); 3138 3139 NL_SET_ERR_MSG_MOD(extack, "address not found"); 3140 return -EADDRNOTAVAIL; 3141} 3142 3143 3144int addrconf_add_ifaddr(struct net *net, void __user *arg) 3145{ 3146 struct ifa6_config cfg = { 3147 .ifa_flags = IFA_F_PERMANENT, 3148 .preferred_lft = INFINITY_LIFE_TIME, 3149 .valid_lft = INFINITY_LIFE_TIME, 3150 }; 3151 struct in6_ifreq ireq; 3152 int err; 3153 3154 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 3155 return -EPERM; 3156 3157 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 3158 return -EFAULT; 3159 3160 cfg.pfx = &ireq.ifr6_addr; 3161 cfg.plen = ireq.ifr6_prefixlen; 3162 3163 rtnl_lock(); 3164 err = inet6_addr_add(net, ireq.ifr6_ifindex, &cfg, NULL); 3165 rtnl_unlock(); 3166 return err; 3167} 3168 3169int addrconf_del_ifaddr(struct net *net, void __user *arg) 3170{ 3171 struct in6_ifreq ireq; 3172 int err; 3173 3174 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 3175 return -EPERM; 3176 3177 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 3178 return -EFAULT; 3179 3180 rtnl_lock(); 3181 err = inet6_addr_del(net, ireq.ifr6_ifindex, 0, &ireq.ifr6_addr, 3182 ireq.ifr6_prefixlen, NULL); 3183 rtnl_unlock(); 3184 return err; 3185} 3186 3187static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr, 3188 int plen, int scope, u8 proto) 3189{ 3190 struct inet6_ifaddr *ifp; 3191 struct ifa6_config cfg = { 3192 .pfx = addr, 3193 .plen = plen, 3194 .ifa_flags = IFA_F_PERMANENT, 3195 .valid_lft = INFINITY_LIFE_TIME, 3196 .preferred_lft = INFINITY_LIFE_TIME, 3197 .scope = scope, 3198 .ifa_proto = proto 3199 }; 3200 3201 ifp = ipv6_add_addr(idev, &cfg, true, NULL); 3202 if (!IS_ERR(ifp)) { 3203 spin_lock_bh(&ifp->lock); 3204 ifp->flags &= ~IFA_F_TENTATIVE; 3205 spin_unlock_bh(&ifp->lock); 3206 rt_genid_bump_ipv6(dev_net(idev->dev)); 3207 ipv6_ifa_notify(RTM_NEWADDR, ifp); 3208 in6_ifa_put(ifp); 3209 } 3210} 3211 3212#if IS_ENABLED(CONFIG_IPV6_SIT) || IS_ENABLED(CONFIG_NET_IPGRE) || IS_ENABLED(CONFIG_IPV6_GRE) 3213static void add_v4_addrs(struct inet6_dev *idev) 3214{ 3215 struct in6_addr addr; 3216 struct net_device *dev; 3217 struct net *net = dev_net(idev->dev); 3218 int scope, plen, offset = 0; 3219 u32 pflags = 0; 3220 3221 ASSERT_RTNL(); 3222 3223 memset(&addr, 0, sizeof(struct in6_addr)); 3224 /* in case of IP6GRE the dev_addr is an IPv6 and therefore we use only the last 4 bytes */ 3225 if (idev->dev->addr_len == sizeof(struct in6_addr)) 3226 offset = sizeof(struct in6_addr) - 4; 3227 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr + offset, 4); 3228 3229 if (!(idev->dev->flags & IFF_POINTOPOINT) && idev->dev->type == ARPHRD_SIT) { 3230 scope = IPV6_ADDR_COMPATv4; 3231 plen = 96; 3232 pflags |= RTF_NONEXTHOP; 3233 } else { 3234 if (idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_NONE) 3235 return; 3236 3237 addr.s6_addr32[0] = htonl(0xfe800000); 3238 scope = IFA_LINK; 3239 plen = 64; 3240 } 3241 3242 if (addr.s6_addr32[3]) { 3243 add_addr(idev, &addr, plen, scope, IFAPROT_UNSPEC); 3244 addrconf_prefix_route(&addr, plen, 0, idev->dev, 0, pflags, 3245 GFP_KERNEL); 3246 return; 3247 } 3248 3249 for_each_netdev(net, dev) { 3250 struct in_device *in_dev = __in_dev_get_rtnl(dev); 3251 if (in_dev && (dev->flags & IFF_UP)) { 3252 struct in_ifaddr *ifa; 3253 int flag = scope; 3254 3255 in_dev_for_each_ifa_rtnl(ifa, in_dev) { 3256 addr.s6_addr32[3] = ifa->ifa_local; 3257 3258 if (ifa->ifa_scope == RT_SCOPE_LINK) 3259 continue; 3260 if (ifa->ifa_scope >= RT_SCOPE_HOST) { 3261 if (idev->dev->flags&IFF_POINTOPOINT) 3262 continue; 3263 flag |= IFA_HOST; 3264 } 3265 3266 add_addr(idev, &addr, plen, flag, 3267 IFAPROT_UNSPEC); 3268 addrconf_prefix_route(&addr, plen, 0, idev->dev, 3269 0, pflags, GFP_KERNEL); 3270 } 3271 } 3272 } 3273} 3274#endif 3275 3276static void init_loopback(struct net_device *dev) 3277{ 3278 struct inet6_dev *idev; 3279 3280 /* ::1 */ 3281 3282 ASSERT_RTNL(); 3283 3284 idev = ipv6_find_idev(dev); 3285 if (IS_ERR(idev)) { 3286 pr_debug("%s: add_dev failed\n", __func__); 3287 return; 3288 } 3289 3290 add_addr(idev, &in6addr_loopback, 128, IFA_HOST, IFAPROT_KERNEL_LO); 3291} 3292 3293void addrconf_add_linklocal(struct inet6_dev *idev, 3294 const struct in6_addr *addr, u32 flags) 3295{ 3296 struct ifa6_config cfg = { 3297 .pfx = addr, 3298 .plen = 64, 3299 .ifa_flags = flags | IFA_F_PERMANENT, 3300 .valid_lft = INFINITY_LIFE_TIME, 3301 .preferred_lft = INFINITY_LIFE_TIME, 3302 .scope = IFA_LINK, 3303 .ifa_proto = IFAPROT_KERNEL_LL 3304 }; 3305 struct inet6_ifaddr *ifp; 3306 3307#ifdef CONFIG_IPV6_OPTIMISTIC_DAD 3308 if ((READ_ONCE(dev_net(idev->dev)->ipv6.devconf_all->optimistic_dad) || 3309 READ_ONCE(idev->cnf.optimistic_dad)) && 3310 !dev_net(idev->dev)->ipv6.devconf_all->forwarding) 3311 cfg.ifa_flags |= IFA_F_OPTIMISTIC; 3312#endif 3313 3314 ifp = ipv6_add_addr(idev, &cfg, true, NULL); 3315 if (!IS_ERR(ifp)) { 3316 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, 0, idev->dev, 3317 0, 0, GFP_ATOMIC); 3318 addrconf_dad_start(ifp); 3319 in6_ifa_put(ifp); 3320 } 3321} 3322EXPORT_SYMBOL_GPL(addrconf_add_linklocal); 3323 3324static bool ipv6_reserved_interfaceid(struct in6_addr address) 3325{ 3326 if ((address.s6_addr32[2] | address.s6_addr32[3]) == 0) 3327 return true; 3328 3329 if (address.s6_addr32[2] == htonl(0x02005eff) && 3330 ((address.s6_addr32[3] & htonl(0xfe000000)) == htonl(0xfe000000))) 3331 return true; 3332 3333 if (address.s6_addr32[2] == htonl(0xfdffffff) && 3334 ((address.s6_addr32[3] & htonl(0xffffff80)) == htonl(0xffffff80))) 3335 return true; 3336 3337 return false; 3338} 3339 3340static int ipv6_generate_stable_address(struct in6_addr *address, 3341 u8 dad_count, 3342 const struct inet6_dev *idev) 3343{ 3344 static DEFINE_SPINLOCK(lock); 3345 static __u32 digest[SHA1_DIGEST_WORDS]; 3346 static __u32 workspace[SHA1_WORKSPACE_WORDS]; 3347 3348 static union { 3349 char __data[SHA1_BLOCK_SIZE]; 3350 struct { 3351 struct in6_addr secret; 3352 __be32 prefix[2]; 3353 unsigned char hwaddr[MAX_ADDR_LEN]; 3354 u8 dad_count; 3355 } __packed; 3356 } data; 3357 3358 struct in6_addr secret; 3359 struct in6_addr temp; 3360 struct net *net = dev_net(idev->dev); 3361 3362 BUILD_BUG_ON(sizeof(data.__data) != sizeof(data)); 3363 3364 if (idev->cnf.stable_secret.initialized) 3365 secret = idev->cnf.stable_secret.secret; 3366 else if (net->ipv6.devconf_dflt->stable_secret.initialized) 3367 secret = net->ipv6.devconf_dflt->stable_secret.secret; 3368 else 3369 return -1; 3370 3371retry: 3372 spin_lock_bh(&lock); 3373 3374 sha1_init(digest); 3375 memset(&data, 0, sizeof(data)); 3376 memset(workspace, 0, sizeof(workspace)); 3377 memcpy(data.hwaddr, idev->dev->perm_addr, idev->dev->addr_len); 3378 data.prefix[0] = address->s6_addr32[0]; 3379 data.prefix[1] = address->s6_addr32[1]; 3380 data.secret = secret; 3381 data.dad_count = dad_count; 3382 3383 sha1_transform(digest, data.__data, workspace); 3384 3385 temp = *address; 3386 temp.s6_addr32[2] = (__force __be32)digest[0]; 3387 temp.s6_addr32[3] = (__force __be32)digest[1]; 3388 3389 spin_unlock_bh(&lock); 3390 3391 if (ipv6_reserved_interfaceid(temp)) { 3392 dad_count++; 3393 if (dad_count > dev_net(idev->dev)->ipv6.sysctl.idgen_retries) 3394 return -1; 3395 goto retry; 3396 } 3397 3398 *address = temp; 3399 return 0; 3400} 3401 3402static void ipv6_gen_mode_random_init(struct inet6_dev *idev) 3403{ 3404 struct ipv6_stable_secret *s = &idev->cnf.stable_secret; 3405 3406 if (s->initialized) 3407 return; 3408 s = &idev->cnf.stable_secret; 3409 get_random_bytes(&s->secret, sizeof(s->secret)); 3410 s->initialized = true; 3411} 3412 3413static void addrconf_addr_gen(struct inet6_dev *idev, bool prefix_route) 3414{ 3415 struct in6_addr addr; 3416 3417 /* no link local addresses on L3 master devices */ 3418 if (netif_is_l3_master(idev->dev)) 3419 return; 3420 3421 /* no link local addresses on devices flagged as slaves */ 3422 if (idev->dev->priv_flags & IFF_NO_ADDRCONF) 3423 return; 3424 3425 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0); 3426 3427 switch (idev->cnf.addr_gen_mode) { 3428 case IN6_ADDR_GEN_MODE_RANDOM: 3429 ipv6_gen_mode_random_init(idev); 3430 fallthrough; 3431 case IN6_ADDR_GEN_MODE_STABLE_PRIVACY: 3432 if (!ipv6_generate_stable_address(&addr, 0, idev)) 3433 addrconf_add_linklocal(idev, &addr, 3434 IFA_F_STABLE_PRIVACY); 3435 else if (prefix_route) 3436 addrconf_prefix_route(&addr, 64, 0, idev->dev, 3437 0, 0, GFP_KERNEL); 3438 break; 3439 case IN6_ADDR_GEN_MODE_EUI64: 3440 /* addrconf_add_linklocal also adds a prefix_route and we 3441 * only need to care about prefix routes if ipv6_generate_eui64 3442 * couldn't generate one. 3443 */ 3444 if (ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) == 0) 3445 addrconf_add_linklocal(idev, &addr, 0); 3446 else if (prefix_route) 3447 addrconf_prefix_route(&addr, 64, 0, idev->dev, 3448 0, 0, GFP_KERNEL); 3449 break; 3450 case IN6_ADDR_GEN_MODE_NONE: 3451 default: 3452 /* will not add any link local address */ 3453 break; 3454 } 3455} 3456 3457static void addrconf_dev_config(struct net_device *dev) 3458{ 3459 struct inet6_dev *idev; 3460 3461 ASSERT_RTNL(); 3462 3463 if ((dev->type != ARPHRD_ETHER) && 3464 (dev->type != ARPHRD_FDDI) && 3465 (dev->type != ARPHRD_ARCNET) && 3466 (dev->type != ARPHRD_INFINIBAND) && 3467 (dev->type != ARPHRD_IEEE1394) && 3468 (dev->type != ARPHRD_TUNNEL6) && 3469 (dev->type != ARPHRD_6LOWPAN) && 3470 (dev->type != ARPHRD_TUNNEL) && 3471 (dev->type != ARPHRD_NONE) && 3472 (dev->type != ARPHRD_RAWIP)) { 3473 /* Alas, we support only Ethernet autoconfiguration. */ 3474 idev = __in6_dev_get(dev); 3475 if (!IS_ERR_OR_NULL(idev) && dev->flags & IFF_UP && 3476 dev->flags & IFF_MULTICAST) 3477 ipv6_mc_up(idev); 3478 return; 3479 } 3480 3481 idev = addrconf_add_dev(dev); 3482 if (IS_ERR(idev)) 3483 return; 3484 3485 /* this device type has no EUI support */ 3486 if (dev->type == ARPHRD_NONE && 3487 idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_EUI64) 3488 WRITE_ONCE(idev->cnf.addr_gen_mode, 3489 IN6_ADDR_GEN_MODE_RANDOM); 3490 3491 addrconf_addr_gen(idev, false); 3492} 3493 3494#if IS_ENABLED(CONFIG_IPV6_SIT) 3495static void addrconf_sit_config(struct net_device *dev) 3496{ 3497 struct inet6_dev *idev; 3498 3499 ASSERT_RTNL(); 3500 3501 /* 3502 * Configure the tunnel with one of our IPv4 3503 * addresses... we should configure all of 3504 * our v4 addrs in the tunnel 3505 */ 3506 3507 idev = ipv6_find_idev(dev); 3508 if (IS_ERR(idev)) { 3509 pr_debug("%s: add_dev failed\n", __func__); 3510 return; 3511 } 3512 3513 if (dev->priv_flags & IFF_ISATAP) { 3514 addrconf_addr_gen(idev, false); 3515 return; 3516 } 3517 3518 add_v4_addrs(idev); 3519 3520 if (dev->flags&IFF_POINTOPOINT) 3521 addrconf_add_mroute(dev); 3522} 3523#endif 3524 3525#if IS_ENABLED(CONFIG_NET_IPGRE) || IS_ENABLED(CONFIG_IPV6_GRE) 3526static void addrconf_gre_config(struct net_device *dev) 3527{ 3528 struct inet6_dev *idev; 3529 3530 ASSERT_RTNL(); 3531 3532 idev = ipv6_find_idev(dev); 3533 if (IS_ERR(idev)) { 3534 pr_debug("%s: add_dev failed\n", __func__); 3535 return; 3536 } 3537 3538 if (dev->type == ARPHRD_ETHER) { 3539 addrconf_addr_gen(idev, true); 3540 return; 3541 } 3542 3543 add_v4_addrs(idev); 3544 3545 if (dev->flags & IFF_POINTOPOINT) 3546 addrconf_add_mroute(dev); 3547} 3548#endif 3549 3550static void addrconf_init_auto_addrs(struct net_device *dev) 3551{ 3552 switch (dev->type) { 3553#if IS_ENABLED(CONFIG_IPV6_SIT) 3554 case ARPHRD_SIT: 3555 addrconf_sit_config(dev); 3556 break; 3557#endif 3558#if IS_ENABLED(CONFIG_NET_IPGRE) || IS_ENABLED(CONFIG_IPV6_GRE) 3559 case ARPHRD_IP6GRE: 3560 case ARPHRD_IPGRE: 3561 addrconf_gre_config(dev); 3562 break; 3563#endif 3564 case ARPHRD_LOOPBACK: 3565 init_loopback(dev); 3566 break; 3567 3568 default: 3569 addrconf_dev_config(dev); 3570 break; 3571 } 3572} 3573 3574static int fixup_permanent_addr(struct net *net, 3575 struct inet6_dev *idev, 3576 struct inet6_ifaddr *ifp) 3577{ 3578 /* !fib6_node means the host route was removed from the 3579 * FIB, for example, if 'lo' device is taken down. In that 3580 * case regenerate the host route. 3581 */ 3582 if (!ifp->rt || !ifp->rt->fib6_node) { 3583 struct fib6_info *f6i, *prev; 3584 3585 f6i = addrconf_f6i_alloc(net, idev, &ifp->addr, false, 3586 GFP_ATOMIC, NULL); 3587 if (IS_ERR(f6i)) 3588 return PTR_ERR(f6i); 3589 3590 /* ifp->rt can be accessed outside of rtnl */ 3591 spin_lock(&ifp->lock); 3592 prev = ifp->rt; 3593 ifp->rt = f6i; 3594 spin_unlock(&ifp->lock); 3595 3596 fib6_info_release(prev); 3597 } 3598 3599 if (!(ifp->flags & IFA_F_NOPREFIXROUTE)) { 3600 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, 3601 ifp->rt_priority, idev->dev, 0, 0, 3602 GFP_ATOMIC); 3603 } 3604 3605 if (ifp->state == INET6_IFADDR_STATE_PREDAD) 3606 addrconf_dad_start(ifp); 3607 3608 return 0; 3609} 3610 3611static void addrconf_permanent_addr(struct net *net, struct net_device *dev) 3612{ 3613 struct inet6_ifaddr *ifp, *tmp; 3614 struct inet6_dev *idev; 3615 3616 idev = __in6_dev_get(dev); 3617 if (!idev) 3618 return; 3619 3620 write_lock_bh(&idev->lock); 3621 3622 list_for_each_entry_safe(ifp, tmp, &idev->addr_list, if_list) { 3623 if ((ifp->flags & IFA_F_PERMANENT) && 3624 fixup_permanent_addr(net, idev, ifp) < 0) { 3625 write_unlock_bh(&idev->lock); 3626 in6_ifa_hold(ifp); 3627 ipv6_del_addr(ifp); 3628 write_lock_bh(&idev->lock); 3629 3630 net_info_ratelimited("%s: Failed to add prefix route for address %pI6c; dropping\n", 3631 idev->dev->name, &ifp->addr); 3632 } 3633 } 3634 3635 write_unlock_bh(&idev->lock); 3636} 3637 3638static int addrconf_notify(struct notifier_block *this, unsigned long event, 3639 void *ptr) 3640{ 3641 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 3642 struct netdev_notifier_change_info *change_info; 3643 struct netdev_notifier_changeupper_info *info; 3644 struct inet6_dev *idev = __in6_dev_get(dev); 3645 struct net *net = dev_net(dev); 3646 int run_pending = 0; 3647 int err; 3648 3649 switch (event) { 3650 case NETDEV_REGISTER: 3651 if (!idev && dev->mtu >= IPV6_MIN_MTU) { 3652 idev = ipv6_add_dev(dev); 3653 if (IS_ERR(idev)) 3654 return notifier_from_errno(PTR_ERR(idev)); 3655 } 3656 break; 3657 3658 case NETDEV_CHANGEMTU: 3659 /* if MTU under IPV6_MIN_MTU stop IPv6 on this interface. */ 3660 if (dev->mtu < IPV6_MIN_MTU) { 3661 addrconf_ifdown(dev, dev != net->loopback_dev); 3662 break; 3663 } 3664 3665 if (idev) { 3666 rt6_mtu_change(dev, dev->mtu); 3667 WRITE_ONCE(idev->cnf.mtu6, dev->mtu); 3668 break; 3669 } 3670 3671 /* allocate new idev */ 3672 idev = ipv6_add_dev(dev); 3673 if (IS_ERR(idev)) 3674 break; 3675 3676 /* device is still not ready */ 3677 if (!(idev->if_flags & IF_READY)) 3678 break; 3679 3680 run_pending = 1; 3681 fallthrough; 3682 case NETDEV_UP: 3683 case NETDEV_CHANGE: 3684 if (idev && idev->cnf.disable_ipv6) 3685 break; 3686 3687 if (dev->priv_flags & IFF_NO_ADDRCONF) { 3688 if (event == NETDEV_UP && !IS_ERR_OR_NULL(idev) && 3689 dev->flags & IFF_UP && dev->flags & IFF_MULTICAST) 3690 ipv6_mc_up(idev); 3691 break; 3692 } 3693 3694 if (event == NETDEV_UP) { 3695 /* restore routes for permanent addresses */ 3696 addrconf_permanent_addr(net, dev); 3697 3698 if (!addrconf_link_ready(dev)) { 3699 /* device is not ready yet. */ 3700 pr_debug("ADDRCONF(NETDEV_UP): %s: link is not ready\n", 3701 dev->name); 3702 break; 3703 } 3704 3705 if (!idev && dev->mtu >= IPV6_MIN_MTU) 3706 idev = ipv6_add_dev(dev); 3707 3708 if (!IS_ERR_OR_NULL(idev)) { 3709 idev->if_flags |= IF_READY; 3710 run_pending = 1; 3711 } 3712 } else if (event == NETDEV_CHANGE) { 3713 if (!addrconf_link_ready(dev)) { 3714 /* device is still not ready. */ 3715 rt6_sync_down_dev(dev, event); 3716 break; 3717 } 3718 3719 if (!IS_ERR_OR_NULL(idev)) { 3720 if (idev->if_flags & IF_READY) { 3721 /* device is already configured - 3722 * but resend MLD reports, we might 3723 * have roamed and need to update 3724 * multicast snooping switches 3725 */ 3726 ipv6_mc_up(idev); 3727 change_info = ptr; 3728 if (change_info->flags_changed & IFF_NOARP) 3729 addrconf_dad_run(idev, true); 3730 rt6_sync_up(dev, RTNH_F_LINKDOWN); 3731 break; 3732 } 3733 idev->if_flags |= IF_READY; 3734 } 3735 3736 pr_debug("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n", 3737 dev->name); 3738 3739 run_pending = 1; 3740 } 3741 3742 addrconf_init_auto_addrs(dev); 3743 3744 if (!IS_ERR_OR_NULL(idev)) { 3745 if (run_pending) 3746 addrconf_dad_run(idev, false); 3747 3748 /* Device has an address by now */ 3749 rt6_sync_up(dev, RTNH_F_DEAD); 3750 3751 /* 3752 * If the MTU changed during the interface down, 3753 * when the interface up, the changed MTU must be 3754 * reflected in the idev as well as routers. 3755 */ 3756 if (idev->cnf.mtu6 != dev->mtu && 3757 dev->mtu >= IPV6_MIN_MTU) { 3758 rt6_mtu_change(dev, dev->mtu); 3759 WRITE_ONCE(idev->cnf.mtu6, dev->mtu); 3760 } 3761 WRITE_ONCE(idev->tstamp, jiffies); 3762 inet6_ifinfo_notify(RTM_NEWLINK, idev); 3763 3764 /* 3765 * If the changed mtu during down is lower than 3766 * IPV6_MIN_MTU stop IPv6 on this interface. 3767 */ 3768 if (dev->mtu < IPV6_MIN_MTU) 3769 addrconf_ifdown(dev, dev != net->loopback_dev); 3770 } 3771 break; 3772 3773 case NETDEV_DOWN: 3774 case NETDEV_UNREGISTER: 3775 /* 3776 * Remove all addresses from this interface. 3777 */ 3778 addrconf_ifdown(dev, event != NETDEV_DOWN); 3779 break; 3780 3781 case NETDEV_CHANGENAME: 3782 if (idev) { 3783 snmp6_unregister_dev(idev); 3784 addrconf_sysctl_unregister(idev); 3785 err = addrconf_sysctl_register(idev); 3786 if (err) 3787 return notifier_from_errno(err); 3788 err = snmp6_register_dev(idev); 3789 if (err) { 3790 addrconf_sysctl_unregister(idev); 3791 return notifier_from_errno(err); 3792 } 3793 } 3794 break; 3795 3796 case NETDEV_PRE_TYPE_CHANGE: 3797 case NETDEV_POST_TYPE_CHANGE: 3798 if (idev) 3799 addrconf_type_change(dev, event); 3800 break; 3801 3802 case NETDEV_CHANGEUPPER: 3803 info = ptr; 3804 3805 /* flush all routes if dev is linked to or unlinked from 3806 * an L3 master device (e.g., VRF) 3807 */ 3808 if (info->upper_dev && netif_is_l3_master(info->upper_dev)) 3809 addrconf_ifdown(dev, false); 3810 } 3811 3812 return NOTIFY_OK; 3813} 3814 3815/* 3816 * addrconf module should be notified of a device going up 3817 */ 3818static struct notifier_block ipv6_dev_notf = { 3819 .notifier_call = addrconf_notify, 3820 .priority = ADDRCONF_NOTIFY_PRIORITY, 3821}; 3822 3823static void addrconf_type_change(struct net_device *dev, unsigned long event) 3824{ 3825 struct inet6_dev *idev; 3826 ASSERT_RTNL(); 3827 3828 idev = __in6_dev_get(dev); 3829 3830 if (event == NETDEV_POST_TYPE_CHANGE) 3831 ipv6_mc_remap(idev); 3832 else if (event == NETDEV_PRE_TYPE_CHANGE) 3833 ipv6_mc_unmap(idev); 3834} 3835 3836static bool addr_is_local(const struct in6_addr *addr) 3837{ 3838 return ipv6_addr_type(addr) & 3839 (IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK); 3840} 3841 3842static int addrconf_ifdown(struct net_device *dev, bool unregister) 3843{ 3844 unsigned long event = unregister ? NETDEV_UNREGISTER : NETDEV_DOWN; 3845 struct net *net = dev_net(dev); 3846 struct inet6_dev *idev; 3847 struct inet6_ifaddr *ifa; 3848 LIST_HEAD(tmp_addr_list); 3849 bool keep_addr = false; 3850 bool was_ready; 3851 int state, i; 3852 3853 ASSERT_RTNL(); 3854 3855 rt6_disable_ip(dev, event); 3856 3857 idev = __in6_dev_get(dev); 3858 if (!idev) 3859 return -ENODEV; 3860 3861 /* 3862 * Step 1: remove reference to ipv6 device from parent device. 3863 * Do not dev_put! 3864 */ 3865 if (unregister) { 3866 idev->dead = 1; 3867 3868 /* protected by rtnl_lock */ 3869 RCU_INIT_POINTER(dev->ip6_ptr, NULL); 3870 3871 /* Step 1.5: remove snmp6 entry */ 3872 snmp6_unregister_dev(idev); 3873 3874 } 3875 3876 /* combine the user config with event to determine if permanent 3877 * addresses are to be removed from address hash table 3878 */ 3879 if (!unregister && !idev->cnf.disable_ipv6) { 3880 /* aggregate the system setting and interface setting */ 3881 int _keep_addr = READ_ONCE(net->ipv6.devconf_all->keep_addr_on_down); 3882 3883 if (!_keep_addr) 3884 _keep_addr = READ_ONCE(idev->cnf.keep_addr_on_down); 3885 3886 keep_addr = (_keep_addr > 0); 3887 } 3888 3889 /* Step 2: clear hash table */ 3890 for (i = 0; i < IN6_ADDR_HSIZE; i++) { 3891 struct hlist_head *h = &net->ipv6.inet6_addr_lst[i]; 3892 3893 spin_lock_bh(&net->ipv6.addrconf_hash_lock); 3894restart: 3895 hlist_for_each_entry_rcu(ifa, h, addr_lst) { 3896 if (ifa->idev == idev) { 3897 addrconf_del_dad_work(ifa); 3898 /* combined flag + permanent flag decide if 3899 * address is retained on a down event 3900 */ 3901 if (!keep_addr || 3902 !(ifa->flags & IFA_F_PERMANENT) || 3903 addr_is_local(&ifa->addr)) { 3904 hlist_del_init_rcu(&ifa->addr_lst); 3905 goto restart; 3906 } 3907 } 3908 } 3909 spin_unlock_bh(&net->ipv6.addrconf_hash_lock); 3910 } 3911 3912 write_lock_bh(&idev->lock); 3913 3914 addrconf_del_rs_timer(idev); 3915 3916 /* Step 2: clear flags for stateless addrconf, repeated down 3917 * detection 3918 */ 3919 was_ready = idev->if_flags & IF_READY; 3920 if (!unregister) 3921 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY); 3922 3923 /* Step 3: clear tempaddr list */ 3924 while (!list_empty(&idev->tempaddr_list)) { 3925 ifa = list_first_entry(&idev->tempaddr_list, 3926 struct inet6_ifaddr, tmp_list); 3927 list_del(&ifa->tmp_list); 3928 write_unlock_bh(&idev->lock); 3929 spin_lock_bh(&ifa->lock); 3930 3931 if (ifa->ifpub) { 3932 in6_ifa_put(ifa->ifpub); 3933 ifa->ifpub = NULL; 3934 } 3935 spin_unlock_bh(&ifa->lock); 3936 in6_ifa_put(ifa); 3937 write_lock_bh(&idev->lock); 3938 } 3939 3940 list_for_each_entry(ifa, &idev->addr_list, if_list) 3941 list_add_tail(&ifa->if_list_aux, &tmp_addr_list); 3942 write_unlock_bh(&idev->lock); 3943 3944 while (!list_empty(&tmp_addr_list)) { 3945 struct fib6_info *rt = NULL; 3946 bool keep; 3947 3948 ifa = list_first_entry(&tmp_addr_list, 3949 struct inet6_ifaddr, if_list_aux); 3950 list_del(&ifa->if_list_aux); 3951 3952 addrconf_del_dad_work(ifa); 3953 3954 keep = keep_addr && (ifa->flags & IFA_F_PERMANENT) && 3955 !addr_is_local(&ifa->addr); 3956 3957 spin_lock_bh(&ifa->lock); 3958 3959 if (keep) { 3960 /* set state to skip the notifier below */ 3961 state = INET6_IFADDR_STATE_DEAD; 3962 ifa->state = INET6_IFADDR_STATE_PREDAD; 3963 if (!(ifa->flags & IFA_F_NODAD)) 3964 ifa->flags |= IFA_F_TENTATIVE; 3965 3966 rt = ifa->rt; 3967 ifa->rt = NULL; 3968 } else { 3969 state = ifa->state; 3970 ifa->state = INET6_IFADDR_STATE_DEAD; 3971 } 3972 3973 spin_unlock_bh(&ifa->lock); 3974 3975 if (rt) 3976 ip6_del_rt(net, rt, false); 3977 3978 if (state != INET6_IFADDR_STATE_DEAD) { 3979 __ipv6_ifa_notify(RTM_DELADDR, ifa); 3980 inet6addr_notifier_call_chain(NETDEV_DOWN, ifa); 3981 } else { 3982 if (idev->cnf.forwarding) 3983 addrconf_leave_anycast(ifa); 3984 addrconf_leave_solict(ifa->idev, &ifa->addr); 3985 } 3986 3987 if (!keep) { 3988 write_lock_bh(&idev->lock); 3989 list_del_rcu(&ifa->if_list); 3990 write_unlock_bh(&idev->lock); 3991 in6_ifa_put(ifa); 3992 } 3993 } 3994 3995 /* Step 5: Discard anycast and multicast list */ 3996 if (unregister) { 3997 ipv6_ac_destroy_dev(idev); 3998 ipv6_mc_destroy_dev(idev); 3999 } else if (was_ready) { 4000 ipv6_mc_down(idev); 4001 } 4002 4003 WRITE_ONCE(idev->tstamp, jiffies); 4004 idev->ra_mtu = 0; 4005 4006 /* Last: Shot the device (if unregistered) */ 4007 if (unregister) { 4008 addrconf_sysctl_unregister(idev); 4009 neigh_parms_release(&nd_tbl, idev->nd_parms); 4010 neigh_ifdown(&nd_tbl, dev); 4011 in6_dev_put(idev); 4012 } 4013 return 0; 4014} 4015 4016static void addrconf_rs_timer(struct timer_list *t) 4017{ 4018 struct inet6_dev *idev = from_timer(idev, t, rs_timer); 4019 struct net_device *dev = idev->dev; 4020 struct in6_addr lladdr; 4021 int rtr_solicits; 4022 4023 write_lock(&idev->lock); 4024 if (idev->dead || !(idev->if_flags & IF_READY)) 4025 goto out; 4026 4027 if (!ipv6_accept_ra(idev)) 4028 goto out; 4029 4030 /* Announcement received after solicitation was sent */ 4031 if (idev->if_flags & IF_RA_RCVD) 4032 goto out; 4033 4034 rtr_solicits = READ_ONCE(idev->cnf.rtr_solicits); 4035 4036 if (idev->rs_probes++ < rtr_solicits || rtr_solicits < 0) { 4037 write_unlock(&idev->lock); 4038 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE)) 4039 ndisc_send_rs(dev, &lladdr, 4040 &in6addr_linklocal_allrouters); 4041 else 4042 goto put; 4043 4044 write_lock(&idev->lock); 4045 idev->rs_interval = rfc3315_s14_backoff_update( 4046 idev->rs_interval, 4047 READ_ONCE(idev->cnf.rtr_solicit_max_interval)); 4048 /* The wait after the last probe can be shorter */ 4049 addrconf_mod_rs_timer(idev, (idev->rs_probes == 4050 READ_ONCE(idev->cnf.rtr_solicits)) ? 4051 READ_ONCE(idev->cnf.rtr_solicit_delay) : 4052 idev->rs_interval); 4053 } else { 4054 /* 4055 * Note: we do not support deprecated "all on-link" 4056 * assumption any longer. 4057 */ 4058 pr_debug("%s: no IPv6 routers present\n", idev->dev->name); 4059 } 4060 4061out: 4062 write_unlock(&idev->lock); 4063put: 4064 in6_dev_put(idev); 4065} 4066 4067/* 4068 * Duplicate Address Detection 4069 */ 4070static void addrconf_dad_kick(struct inet6_ifaddr *ifp) 4071{ 4072 struct inet6_dev *idev = ifp->idev; 4073 unsigned long rand_num; 4074 u64 nonce; 4075 4076 if (ifp->flags & IFA_F_OPTIMISTIC) 4077 rand_num = 0; 4078 else 4079 rand_num = get_random_u32_below( 4080 READ_ONCE(idev->cnf.rtr_solicit_delay) ? : 1); 4081 4082 nonce = 0; 4083 if (READ_ONCE(idev->cnf.enhanced_dad) || 4084 READ_ONCE(dev_net(idev->dev)->ipv6.devconf_all->enhanced_dad)) { 4085 do 4086 get_random_bytes(&nonce, 6); 4087 while (nonce == 0); 4088 } 4089 ifp->dad_nonce = nonce; 4090 ifp->dad_probes = READ_ONCE(idev->cnf.dad_transmits); 4091 addrconf_mod_dad_work(ifp, rand_num); 4092} 4093 4094static void addrconf_dad_begin(struct inet6_ifaddr *ifp) 4095{ 4096 struct inet6_dev *idev = ifp->idev; 4097 struct net_device *dev = idev->dev; 4098 bool bump_id, notify = false; 4099 struct net *net; 4100 4101 addrconf_join_solict(dev, &ifp->addr); 4102 4103 read_lock_bh(&idev->lock); 4104 spin_lock(&ifp->lock); 4105 if (ifp->state == INET6_IFADDR_STATE_DEAD) 4106 goto out; 4107 4108 net = dev_net(dev); 4109 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) || 4110 (READ_ONCE(net->ipv6.devconf_all->accept_dad) < 1 && 4111 READ_ONCE(idev->cnf.accept_dad) < 1) || 4112 !(ifp->flags&IFA_F_TENTATIVE) || 4113 ifp->flags & IFA_F_NODAD) { 4114 bool send_na = false; 4115 4116 if (ifp->flags & IFA_F_TENTATIVE && 4117 !(ifp->flags & IFA_F_OPTIMISTIC)) 4118 send_na = true; 4119 bump_id = ifp->flags & IFA_F_TENTATIVE; 4120 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED); 4121 spin_unlock(&ifp->lock); 4122 read_unlock_bh(&idev->lock); 4123 4124 addrconf_dad_completed(ifp, bump_id, send_na); 4125 return; 4126 } 4127 4128 if (!(idev->if_flags & IF_READY)) { 4129 spin_unlock(&ifp->lock); 4130 read_unlock_bh(&idev->lock); 4131 /* 4132 * If the device is not ready: 4133 * - keep it tentative if it is a permanent address. 4134 * - otherwise, kill it. 4135 */ 4136 in6_ifa_hold(ifp); 4137 addrconf_dad_stop(ifp, 0); 4138 return; 4139 } 4140 4141 /* 4142 * Optimistic nodes can start receiving 4143 * Frames right away 4144 */ 4145 if (ifp->flags & IFA_F_OPTIMISTIC) { 4146 ip6_ins_rt(net, ifp->rt); 4147 if (ipv6_use_optimistic_addr(net, idev)) { 4148 /* Because optimistic nodes can use this address, 4149 * notify listeners. If DAD fails, RTM_DELADDR is sent. 4150 */ 4151 notify = true; 4152 } 4153 } 4154 4155 addrconf_dad_kick(ifp); 4156out: 4157 spin_unlock(&ifp->lock); 4158 read_unlock_bh(&idev->lock); 4159 if (notify) 4160 ipv6_ifa_notify(RTM_NEWADDR, ifp); 4161} 4162 4163static void addrconf_dad_start(struct inet6_ifaddr *ifp) 4164{ 4165 bool begin_dad = false; 4166 4167 spin_lock_bh(&ifp->lock); 4168 if (ifp->state != INET6_IFADDR_STATE_DEAD) { 4169 ifp->state = INET6_IFADDR_STATE_PREDAD; 4170 begin_dad = true; 4171 } 4172 spin_unlock_bh(&ifp->lock); 4173 4174 if (begin_dad) 4175 addrconf_mod_dad_work(ifp, 0); 4176} 4177 4178static void addrconf_dad_work(struct work_struct *w) 4179{ 4180 struct inet6_ifaddr *ifp = container_of(to_delayed_work(w), 4181 struct inet6_ifaddr, 4182 dad_work); 4183 struct inet6_dev *idev = ifp->idev; 4184 bool bump_id, disable_ipv6 = false; 4185 struct in6_addr mcaddr; 4186 4187 enum { 4188 DAD_PROCESS, 4189 DAD_BEGIN, 4190 DAD_ABORT, 4191 } action = DAD_PROCESS; 4192 4193 rtnl_lock(); 4194 4195 spin_lock_bh(&ifp->lock); 4196 if (ifp->state == INET6_IFADDR_STATE_PREDAD) { 4197 action = DAD_BEGIN; 4198 ifp->state = INET6_IFADDR_STATE_DAD; 4199 } else if (ifp->state == INET6_IFADDR_STATE_ERRDAD) { 4200 action = DAD_ABORT; 4201 ifp->state = INET6_IFADDR_STATE_POSTDAD; 4202 4203 if ((READ_ONCE(dev_net(idev->dev)->ipv6.devconf_all->accept_dad) > 1 || 4204 READ_ONCE(idev->cnf.accept_dad) > 1) && 4205 !idev->cnf.disable_ipv6 && 4206 !(ifp->flags & IFA_F_STABLE_PRIVACY)) { 4207 struct in6_addr addr; 4208 4209 addr.s6_addr32[0] = htonl(0xfe800000); 4210 addr.s6_addr32[1] = 0; 4211 4212 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) && 4213 ipv6_addr_equal(&ifp->addr, &addr)) { 4214 /* DAD failed for link-local based on MAC */ 4215 WRITE_ONCE(idev->cnf.disable_ipv6, 1); 4216 4217 pr_info("%s: IPv6 being disabled!\n", 4218 ifp->idev->dev->name); 4219 disable_ipv6 = true; 4220 } 4221 } 4222 } 4223 spin_unlock_bh(&ifp->lock); 4224 4225 if (action == DAD_BEGIN) { 4226 addrconf_dad_begin(ifp); 4227 goto out; 4228 } else if (action == DAD_ABORT) { 4229 in6_ifa_hold(ifp); 4230 addrconf_dad_stop(ifp, 1); 4231 if (disable_ipv6) 4232 addrconf_ifdown(idev->dev, false); 4233 goto out; 4234 } 4235 4236 if (!ifp->dad_probes && addrconf_dad_end(ifp)) 4237 goto out; 4238 4239 write_lock_bh(&idev->lock); 4240 if (idev->dead || !(idev->if_flags & IF_READY)) { 4241 write_unlock_bh(&idev->lock); 4242 goto out; 4243 } 4244 4245 spin_lock(&ifp->lock); 4246 if (ifp->state == INET6_IFADDR_STATE_DEAD) { 4247 spin_unlock(&ifp->lock); 4248 write_unlock_bh(&idev->lock); 4249 goto out; 4250 } 4251 4252 if (ifp->dad_probes == 0) { 4253 bool send_na = false; 4254 4255 /* 4256 * DAD was successful 4257 */ 4258 4259 if (ifp->flags & IFA_F_TENTATIVE && 4260 !(ifp->flags & IFA_F_OPTIMISTIC)) 4261 send_na = true; 4262 bump_id = ifp->flags & IFA_F_TENTATIVE; 4263 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED); 4264 spin_unlock(&ifp->lock); 4265 write_unlock_bh(&idev->lock); 4266 4267 addrconf_dad_completed(ifp, bump_id, send_na); 4268 4269 goto out; 4270 } 4271 4272 ifp->dad_probes--; 4273 addrconf_mod_dad_work(ifp, 4274 max(NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME), 4275 HZ/100)); 4276 spin_unlock(&ifp->lock); 4277 write_unlock_bh(&idev->lock); 4278 4279 /* send a neighbour solicitation for our addr */ 4280 addrconf_addr_solict_mult(&ifp->addr, &mcaddr); 4281 ndisc_send_ns(ifp->idev->dev, &ifp->addr, &mcaddr, &in6addr_any, 4282 ifp->dad_nonce); 4283out: 4284 in6_ifa_put(ifp); 4285 rtnl_unlock(); 4286} 4287 4288/* ifp->idev must be at least read locked */ 4289static bool ipv6_lonely_lladdr(struct inet6_ifaddr *ifp) 4290{ 4291 struct inet6_ifaddr *ifpiter; 4292 struct inet6_dev *idev = ifp->idev; 4293 4294 list_for_each_entry_reverse(ifpiter, &idev->addr_list, if_list) { 4295 if (ifpiter->scope > IFA_LINK) 4296 break; 4297 if (ifp != ifpiter && ifpiter->scope == IFA_LINK && 4298 (ifpiter->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE| 4299 IFA_F_OPTIMISTIC|IFA_F_DADFAILED)) == 4300 IFA_F_PERMANENT) 4301 return false; 4302 } 4303 return true; 4304} 4305 4306static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id, 4307 bool send_na) 4308{ 4309 struct net_device *dev = ifp->idev->dev; 4310 struct in6_addr lladdr; 4311 bool send_rs, send_mld; 4312 4313 addrconf_del_dad_work(ifp); 4314 4315 /* 4316 * Configure the address for reception. Now it is valid. 4317 */ 4318 4319 ipv6_ifa_notify(RTM_NEWADDR, ifp); 4320 4321 /* If added prefix is link local and we are prepared to process 4322 router advertisements, start sending router solicitations. 4323 */ 4324 4325 read_lock_bh(&ifp->idev->lock); 4326 send_mld = ifp->scope == IFA_LINK && ipv6_lonely_lladdr(ifp); 4327 send_rs = send_mld && 4328 ipv6_accept_ra(ifp->idev) && 4329 READ_ONCE(ifp->idev->cnf.rtr_solicits) != 0 && 4330 (dev->flags & IFF_LOOPBACK) == 0 && 4331 (dev->type != ARPHRD_TUNNEL) && 4332 !netif_is_team_port(dev); 4333 read_unlock_bh(&ifp->idev->lock); 4334 4335 /* While dad is in progress mld report's source address is in6_addrany. 4336 * Resend with proper ll now. 4337 */ 4338 if (send_mld) 4339 ipv6_mc_dad_complete(ifp->idev); 4340 4341 /* send unsolicited NA if enabled */ 4342 if (send_na && 4343 (READ_ONCE(ifp->idev->cnf.ndisc_notify) || 4344 READ_ONCE(dev_net(dev)->ipv6.devconf_all->ndisc_notify))) { 4345 ndisc_send_na(dev, &in6addr_linklocal_allnodes, &ifp->addr, 4346 /*router=*/ !!ifp->idev->cnf.forwarding, 4347 /*solicited=*/ false, /*override=*/ true, 4348 /*inc_opt=*/ true); 4349 } 4350 4351 if (send_rs) { 4352 /* 4353 * If a host as already performed a random delay 4354 * [...] as part of DAD [...] there is no need 4355 * to delay again before sending the first RS 4356 */ 4357 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE)) 4358 return; 4359 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters); 4360 4361 write_lock_bh(&ifp->idev->lock); 4362 spin_lock(&ifp->lock); 4363 ifp->idev->rs_interval = rfc3315_s14_backoff_init( 4364 READ_ONCE(ifp->idev->cnf.rtr_solicit_interval)); 4365 ifp->idev->rs_probes = 1; 4366 ifp->idev->if_flags |= IF_RS_SENT; 4367 addrconf_mod_rs_timer(ifp->idev, ifp->idev->rs_interval); 4368 spin_unlock(&ifp->lock); 4369 write_unlock_bh(&ifp->idev->lock); 4370 } 4371 4372 if (bump_id) 4373 rt_genid_bump_ipv6(dev_net(dev)); 4374 4375 /* Make sure that a new temporary address will be created 4376 * before this temporary address becomes deprecated. 4377 */ 4378 if (ifp->flags & IFA_F_TEMPORARY) 4379 addrconf_verify_rtnl(dev_net(dev)); 4380} 4381 4382static void addrconf_dad_run(struct inet6_dev *idev, bool restart) 4383{ 4384 struct inet6_ifaddr *ifp; 4385 4386 read_lock_bh(&idev->lock); 4387 list_for_each_entry(ifp, &idev->addr_list, if_list) { 4388 spin_lock(&ifp->lock); 4389 if ((ifp->flags & IFA_F_TENTATIVE && 4390 ifp->state == INET6_IFADDR_STATE_DAD) || restart) { 4391 if (restart) 4392 ifp->state = INET6_IFADDR_STATE_PREDAD; 4393 addrconf_dad_kick(ifp); 4394 } 4395 spin_unlock(&ifp->lock); 4396 } 4397 read_unlock_bh(&idev->lock); 4398} 4399 4400#ifdef CONFIG_PROC_FS 4401struct if6_iter_state { 4402 struct seq_net_private p; 4403 int bucket; 4404 int offset; 4405}; 4406 4407static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos) 4408{ 4409 struct if6_iter_state *state = seq->private; 4410 struct net *net = seq_file_net(seq); 4411 struct inet6_ifaddr *ifa = NULL; 4412 int p = 0; 4413 4414 /* initial bucket if pos is 0 */ 4415 if (pos == 0) { 4416 state->bucket = 0; 4417 state->offset = 0; 4418 } 4419 4420 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) { 4421 hlist_for_each_entry_rcu(ifa, &net->ipv6.inet6_addr_lst[state->bucket], 4422 addr_lst) { 4423 /* sync with offset */ 4424 if (p < state->offset) { 4425 p++; 4426 continue; 4427 } 4428 return ifa; 4429 } 4430 4431 /* prepare for next bucket */ 4432 state->offset = 0; 4433 p = 0; 4434 } 4435 return NULL; 4436} 4437 4438static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, 4439 struct inet6_ifaddr *ifa) 4440{ 4441 struct if6_iter_state *state = seq->private; 4442 struct net *net = seq_file_net(seq); 4443 4444 hlist_for_each_entry_continue_rcu(ifa, addr_lst) { 4445 state->offset++; 4446 return ifa; 4447 } 4448 4449 state->offset = 0; 4450 while (++state->bucket < IN6_ADDR_HSIZE) { 4451 hlist_for_each_entry_rcu(ifa, 4452 &net->ipv6.inet6_addr_lst[state->bucket], addr_lst) { 4453 return ifa; 4454 } 4455 } 4456 4457 return NULL; 4458} 4459 4460static void *if6_seq_start(struct seq_file *seq, loff_t *pos) 4461 __acquires(rcu) 4462{ 4463 rcu_read_lock(); 4464 return if6_get_first(seq, *pos); 4465} 4466 4467static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos) 4468{ 4469 struct inet6_ifaddr *ifa; 4470 4471 ifa = if6_get_next(seq, v); 4472 ++*pos; 4473 return ifa; 4474} 4475 4476static void if6_seq_stop(struct seq_file *seq, void *v) 4477 __releases(rcu) 4478{ 4479 rcu_read_unlock(); 4480} 4481 4482static int if6_seq_show(struct seq_file *seq, void *v) 4483{ 4484 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v; 4485 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n", 4486 &ifp->addr, 4487 ifp->idev->dev->ifindex, 4488 ifp->prefix_len, 4489 ifp->scope, 4490 (u8) ifp->flags, 4491 ifp->idev->dev->name); 4492 return 0; 4493} 4494 4495static const struct seq_operations if6_seq_ops = { 4496 .start = if6_seq_start, 4497 .next = if6_seq_next, 4498 .show = if6_seq_show, 4499 .stop = if6_seq_stop, 4500}; 4501 4502static int __net_init if6_proc_net_init(struct net *net) 4503{ 4504 if (!proc_create_net("if_inet6", 0444, net->proc_net, &if6_seq_ops, 4505 sizeof(struct if6_iter_state))) 4506 return -ENOMEM; 4507 return 0; 4508} 4509 4510static void __net_exit if6_proc_net_exit(struct net *net) 4511{ 4512 remove_proc_entry("if_inet6", net->proc_net); 4513} 4514 4515static struct pernet_operations if6_proc_net_ops = { 4516 .init = if6_proc_net_init, 4517 .exit = if6_proc_net_exit, 4518}; 4519 4520int __init if6_proc_init(void) 4521{ 4522 return register_pernet_subsys(&if6_proc_net_ops); 4523} 4524 4525void if6_proc_exit(void) 4526{ 4527 unregister_pernet_subsys(&if6_proc_net_ops); 4528} 4529#endif /* CONFIG_PROC_FS */ 4530 4531#if IS_ENABLED(CONFIG_IPV6_MIP6) 4532/* Check if address is a home address configured on any interface. */ 4533int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr) 4534{ 4535 unsigned int hash = inet6_addr_hash(net, addr); 4536 struct inet6_ifaddr *ifp = NULL; 4537 int ret = 0; 4538 4539 rcu_read_lock(); 4540 hlist_for_each_entry_rcu(ifp, &net->ipv6.inet6_addr_lst[hash], addr_lst) { 4541 if (ipv6_addr_equal(&ifp->addr, addr) && 4542 (ifp->flags & IFA_F_HOMEADDRESS)) { 4543 ret = 1; 4544 break; 4545 } 4546 } 4547 rcu_read_unlock(); 4548 return ret; 4549} 4550#endif 4551 4552/* RFC6554 has some algorithm to avoid loops in segment routing by 4553 * checking if the segments contains any of a local interface address. 4554 * 4555 * Quote: 4556 * 4557 * To detect loops in the SRH, a router MUST determine if the SRH 4558 * includes multiple addresses assigned to any interface on that router. 4559 * If such addresses appear more than once and are separated by at least 4560 * one address not assigned to that router. 4561 */ 4562int ipv6_chk_rpl_srh_loop(struct net *net, const struct in6_addr *segs, 4563 unsigned char nsegs) 4564{ 4565 const struct in6_addr *addr; 4566 int i, ret = 0, found = 0; 4567 struct inet6_ifaddr *ifp; 4568 bool separated = false; 4569 unsigned int hash; 4570 bool hash_found; 4571 4572 rcu_read_lock(); 4573 for (i = 0; i < nsegs; i++) { 4574 addr = &segs[i]; 4575 hash = inet6_addr_hash(net, addr); 4576 4577 hash_found = false; 4578 hlist_for_each_entry_rcu(ifp, &net->ipv6.inet6_addr_lst[hash], addr_lst) { 4579 4580 if (ipv6_addr_equal(&ifp->addr, addr)) { 4581 hash_found = true; 4582 break; 4583 } 4584 } 4585 4586 if (hash_found) { 4587 if (found > 1 && separated) { 4588 ret = 1; 4589 break; 4590 } 4591 4592 separated = false; 4593 found++; 4594 } else { 4595 separated = true; 4596 } 4597 } 4598 rcu_read_unlock(); 4599 4600 return ret; 4601} 4602 4603/* 4604 * Periodic address status verification 4605 */ 4606 4607static void addrconf_verify_rtnl(struct net *net) 4608{ 4609 unsigned long now, next, next_sec, next_sched; 4610 struct inet6_ifaddr *ifp; 4611 int i; 4612 4613 ASSERT_RTNL(); 4614 4615 rcu_read_lock_bh(); 4616 now = jiffies; 4617 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY); 4618 4619 cancel_delayed_work(&net->ipv6.addr_chk_work); 4620 4621 for (i = 0; i < IN6_ADDR_HSIZE; i++) { 4622restart: 4623 hlist_for_each_entry_rcu_bh(ifp, &net->ipv6.inet6_addr_lst[i], addr_lst) { 4624 unsigned long age; 4625 4626 /* When setting preferred_lft to a value not zero or 4627 * infinity, while valid_lft is infinity 4628 * IFA_F_PERMANENT has a non-infinity life time. 4629 */ 4630 if ((ifp->flags & IFA_F_PERMANENT) && 4631 (ifp->prefered_lft == INFINITY_LIFE_TIME)) 4632 continue; 4633 4634 spin_lock(&ifp->lock); 4635 /* We try to batch several events at once. */ 4636 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ; 4637 4638 if ((ifp->flags&IFA_F_TEMPORARY) && 4639 !(ifp->flags&IFA_F_TENTATIVE) && 4640 ifp->prefered_lft != INFINITY_LIFE_TIME && 4641 !ifp->regen_count && ifp->ifpub) { 4642 /* This is a non-regenerated temporary addr. */ 4643 4644 unsigned long regen_advance = ipv6_get_regen_advance(ifp->idev); 4645 4646 if (age + regen_advance >= ifp->prefered_lft) { 4647 struct inet6_ifaddr *ifpub = ifp->ifpub; 4648 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 4649 next = ifp->tstamp + ifp->prefered_lft * HZ; 4650 4651 ifp->regen_count++; 4652 in6_ifa_hold(ifp); 4653 in6_ifa_hold(ifpub); 4654 spin_unlock(&ifp->lock); 4655 4656 spin_lock(&ifpub->lock); 4657 ifpub->regen_count = 0; 4658 spin_unlock(&ifpub->lock); 4659 rcu_read_unlock_bh(); 4660 ipv6_create_tempaddr(ifpub, true); 4661 in6_ifa_put(ifpub); 4662 in6_ifa_put(ifp); 4663 rcu_read_lock_bh(); 4664 goto restart; 4665 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next)) 4666 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ; 4667 } 4668 4669 if (ifp->valid_lft != INFINITY_LIFE_TIME && 4670 age >= ifp->valid_lft) { 4671 spin_unlock(&ifp->lock); 4672 in6_ifa_hold(ifp); 4673 rcu_read_unlock_bh(); 4674 ipv6_del_addr(ifp); 4675 rcu_read_lock_bh(); 4676 goto restart; 4677 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) { 4678 spin_unlock(&ifp->lock); 4679 continue; 4680 } else if (age >= ifp->prefered_lft) { 4681 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */ 4682 int deprecate = 0; 4683 4684 if (!(ifp->flags&IFA_F_DEPRECATED)) { 4685 deprecate = 1; 4686 ifp->flags |= IFA_F_DEPRECATED; 4687 } 4688 4689 if ((ifp->valid_lft != INFINITY_LIFE_TIME) && 4690 (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))) 4691 next = ifp->tstamp + ifp->valid_lft * HZ; 4692 4693 spin_unlock(&ifp->lock); 4694 4695 if (deprecate) { 4696 in6_ifa_hold(ifp); 4697 4698 ipv6_ifa_notify(0, ifp); 4699 in6_ifa_put(ifp); 4700 goto restart; 4701 } 4702 } else { 4703 /* ifp->prefered_lft <= ifp->valid_lft */ 4704 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 4705 next = ifp->tstamp + ifp->prefered_lft * HZ; 4706 spin_unlock(&ifp->lock); 4707 } 4708 } 4709 } 4710 4711 next_sec = round_jiffies_up(next); 4712 next_sched = next; 4713 4714 /* If rounded timeout is accurate enough, accept it. */ 4715 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ)) 4716 next_sched = next_sec; 4717 4718 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */ 4719 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX)) 4720 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX; 4721 4722 pr_debug("now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n", 4723 now, next, next_sec, next_sched); 4724 mod_delayed_work(addrconf_wq, &net->ipv6.addr_chk_work, next_sched - now); 4725 rcu_read_unlock_bh(); 4726} 4727 4728static void addrconf_verify_work(struct work_struct *w) 4729{ 4730 struct net *net = container_of(to_delayed_work(w), struct net, 4731 ipv6.addr_chk_work); 4732 4733 rtnl_lock(); 4734 addrconf_verify_rtnl(net); 4735 rtnl_unlock(); 4736} 4737 4738static void addrconf_verify(struct net *net) 4739{ 4740 mod_delayed_work(addrconf_wq, &net->ipv6.addr_chk_work, 0); 4741} 4742 4743static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local, 4744 struct in6_addr **peer_pfx) 4745{ 4746 struct in6_addr *pfx = NULL; 4747 4748 *peer_pfx = NULL; 4749 4750 if (addr) 4751 pfx = nla_data(addr); 4752 4753 if (local) { 4754 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx))) 4755 *peer_pfx = pfx; 4756 pfx = nla_data(local); 4757 } 4758 4759 return pfx; 4760} 4761 4762static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = { 4763 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) }, 4764 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) }, 4765 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) }, 4766 [IFA_FLAGS] = { .len = sizeof(u32) }, 4767 [IFA_RT_PRIORITY] = { .len = sizeof(u32) }, 4768 [IFA_TARGET_NETNSID] = { .type = NLA_S32 }, 4769 [IFA_PROTO] = { .type = NLA_U8 }, 4770}; 4771 4772static int 4773inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, 4774 struct netlink_ext_ack *extack) 4775{ 4776 struct net *net = sock_net(skb->sk); 4777 struct ifaddrmsg *ifm; 4778 struct nlattr *tb[IFA_MAX+1]; 4779 struct in6_addr *pfx, *peer_pfx; 4780 u32 ifa_flags; 4781 int err; 4782 4783 err = nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX, 4784 ifa_ipv6_policy, extack); 4785 if (err < 0) 4786 return err; 4787 4788 ifm = nlmsg_data(nlh); 4789 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx); 4790 if (!pfx) 4791 return -EINVAL; 4792 4793 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags; 4794 4795 /* We ignore other flags so far. */ 4796 ifa_flags &= IFA_F_MANAGETEMPADDR; 4797 4798 return inet6_addr_del(net, ifm->ifa_index, ifa_flags, pfx, 4799 ifm->ifa_prefixlen, extack); 4800} 4801 4802static int modify_prefix_route(struct inet6_ifaddr *ifp, 4803 unsigned long expires, u32 flags, 4804 bool modify_peer) 4805{ 4806 struct fib6_table *table; 4807 struct fib6_info *f6i; 4808 u32 prio; 4809 4810 f6i = addrconf_get_prefix_route(modify_peer ? &ifp->peer_addr : &ifp->addr, 4811 ifp->prefix_len, 4812 ifp->idev->dev, 0, RTF_DEFAULT, true); 4813 if (!f6i) 4814 return -ENOENT; 4815 4816 prio = ifp->rt_priority ? : IP6_RT_PRIO_ADDRCONF; 4817 if (f6i->fib6_metric != prio) { 4818 /* delete old one */ 4819 ip6_del_rt(dev_net(ifp->idev->dev), f6i, false); 4820 4821 /* add new one */ 4822 addrconf_prefix_route(modify_peer ? &ifp->peer_addr : &ifp->addr, 4823 ifp->prefix_len, 4824 ifp->rt_priority, ifp->idev->dev, 4825 expires, flags, GFP_KERNEL); 4826 } else { 4827 table = f6i->fib6_table; 4828 spin_lock_bh(&table->tb6_lock); 4829 4830 if (!(flags & RTF_EXPIRES)) { 4831 fib6_clean_expires(f6i); 4832 fib6_remove_gc_list(f6i); 4833 } else { 4834 fib6_set_expires(f6i, expires); 4835 fib6_add_gc_list(f6i); 4836 } 4837 4838 spin_unlock_bh(&table->tb6_lock); 4839 4840 fib6_info_release(f6i); 4841 } 4842 4843 return 0; 4844} 4845 4846static int inet6_addr_modify(struct net *net, struct inet6_ifaddr *ifp, 4847 struct ifa6_config *cfg) 4848{ 4849 u32 flags; 4850 clock_t expires; 4851 unsigned long timeout; 4852 bool was_managetempaddr; 4853 bool had_prefixroute; 4854 bool new_peer = false; 4855 4856 ASSERT_RTNL(); 4857 4858 if (!cfg->valid_lft || cfg->preferred_lft > cfg->valid_lft) 4859 return -EINVAL; 4860 4861 if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR && 4862 (ifp->flags & IFA_F_TEMPORARY || ifp->prefix_len != 64)) 4863 return -EINVAL; 4864 4865 if (!(ifp->flags & IFA_F_TENTATIVE) || ifp->flags & IFA_F_DADFAILED) 4866 cfg->ifa_flags &= ~IFA_F_OPTIMISTIC; 4867 4868 timeout = addrconf_timeout_fixup(cfg->valid_lft, HZ); 4869 if (addrconf_finite_timeout(timeout)) { 4870 expires = jiffies_to_clock_t(timeout * HZ); 4871 cfg->valid_lft = timeout; 4872 flags = RTF_EXPIRES; 4873 } else { 4874 expires = 0; 4875 flags = 0; 4876 cfg->ifa_flags |= IFA_F_PERMANENT; 4877 } 4878 4879 timeout = addrconf_timeout_fixup(cfg->preferred_lft, HZ); 4880 if (addrconf_finite_timeout(timeout)) { 4881 if (timeout == 0) 4882 cfg->ifa_flags |= IFA_F_DEPRECATED; 4883 cfg->preferred_lft = timeout; 4884 } 4885 4886 if (cfg->peer_pfx && 4887 memcmp(&ifp->peer_addr, cfg->peer_pfx, sizeof(struct in6_addr))) { 4888 if (!ipv6_addr_any(&ifp->peer_addr)) 4889 cleanup_prefix_route(ifp, expires, true, true); 4890 new_peer = true; 4891 } 4892 4893 spin_lock_bh(&ifp->lock); 4894 was_managetempaddr = ifp->flags & IFA_F_MANAGETEMPADDR; 4895 had_prefixroute = ifp->flags & IFA_F_PERMANENT && 4896 !(ifp->flags & IFA_F_NOPREFIXROUTE); 4897 ifp->flags &= ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | 4898 IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR | 4899 IFA_F_NOPREFIXROUTE); 4900 ifp->flags |= cfg->ifa_flags; 4901 WRITE_ONCE(ifp->tstamp, jiffies); 4902 WRITE_ONCE(ifp->valid_lft, cfg->valid_lft); 4903 WRITE_ONCE(ifp->prefered_lft, cfg->preferred_lft); 4904 WRITE_ONCE(ifp->ifa_proto, cfg->ifa_proto); 4905 4906 if (cfg->rt_priority && cfg->rt_priority != ifp->rt_priority) 4907 WRITE_ONCE(ifp->rt_priority, cfg->rt_priority); 4908 4909 if (new_peer) 4910 ifp->peer_addr = *cfg->peer_pfx; 4911 4912 spin_unlock_bh(&ifp->lock); 4913 if (!(ifp->flags&IFA_F_TENTATIVE)) 4914 ipv6_ifa_notify(0, ifp); 4915 4916 if (!(cfg->ifa_flags & IFA_F_NOPREFIXROUTE)) { 4917 int rc = -ENOENT; 4918 4919 if (had_prefixroute) 4920 rc = modify_prefix_route(ifp, expires, flags, false); 4921 4922 /* prefix route could have been deleted; if so restore it */ 4923 if (rc == -ENOENT) { 4924 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, 4925 ifp->rt_priority, ifp->idev->dev, 4926 expires, flags, GFP_KERNEL); 4927 } 4928 4929 if (had_prefixroute && !ipv6_addr_any(&ifp->peer_addr)) 4930 rc = modify_prefix_route(ifp, expires, flags, true); 4931 4932 if (rc == -ENOENT && !ipv6_addr_any(&ifp->peer_addr)) { 4933 addrconf_prefix_route(&ifp->peer_addr, ifp->prefix_len, 4934 ifp->rt_priority, ifp->idev->dev, 4935 expires, flags, GFP_KERNEL); 4936 } 4937 } else if (had_prefixroute) { 4938 enum cleanup_prefix_rt_t action; 4939 unsigned long rt_expires; 4940 4941 write_lock_bh(&ifp->idev->lock); 4942 action = check_cleanup_prefix_route(ifp, &rt_expires); 4943 write_unlock_bh(&ifp->idev->lock); 4944 4945 if (action != CLEANUP_PREFIX_RT_NOP) { 4946 cleanup_prefix_route(ifp, rt_expires, 4947 action == CLEANUP_PREFIX_RT_DEL, false); 4948 } 4949 } 4950 4951 if (was_managetempaddr || ifp->flags & IFA_F_MANAGETEMPADDR) { 4952 if (was_managetempaddr && 4953 !(ifp->flags & IFA_F_MANAGETEMPADDR)) { 4954 cfg->valid_lft = 0; 4955 cfg->preferred_lft = 0; 4956 } 4957 manage_tempaddrs(ifp->idev, ifp, cfg->valid_lft, 4958 cfg->preferred_lft, !was_managetempaddr, 4959 jiffies); 4960 } 4961 4962 addrconf_verify_rtnl(net); 4963 4964 return 0; 4965} 4966 4967static int 4968inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, 4969 struct netlink_ext_ack *extack) 4970{ 4971 struct net *net = sock_net(skb->sk); 4972 struct ifaddrmsg *ifm; 4973 struct nlattr *tb[IFA_MAX+1]; 4974 struct in6_addr *peer_pfx; 4975 struct inet6_ifaddr *ifa; 4976 struct net_device *dev; 4977 struct inet6_dev *idev; 4978 struct ifa6_config cfg; 4979 int err; 4980 4981 err = nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX, 4982 ifa_ipv6_policy, extack); 4983 if (err < 0) 4984 return err; 4985 4986 memset(&cfg, 0, sizeof(cfg)); 4987 4988 ifm = nlmsg_data(nlh); 4989 cfg.pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx); 4990 if (!cfg.pfx) 4991 return -EINVAL; 4992 4993 cfg.peer_pfx = peer_pfx; 4994 cfg.plen = ifm->ifa_prefixlen; 4995 if (tb[IFA_RT_PRIORITY]) 4996 cfg.rt_priority = nla_get_u32(tb[IFA_RT_PRIORITY]); 4997 4998 if (tb[IFA_PROTO]) 4999 cfg.ifa_proto = nla_get_u8(tb[IFA_PROTO]); 5000 5001 cfg.valid_lft = INFINITY_LIFE_TIME; 5002 cfg.preferred_lft = INFINITY_LIFE_TIME; 5003 5004 if (tb[IFA_CACHEINFO]) { 5005 struct ifa_cacheinfo *ci; 5006 5007 ci = nla_data(tb[IFA_CACHEINFO]); 5008 cfg.valid_lft = ci->ifa_valid; 5009 cfg.preferred_lft = ci->ifa_prefered; 5010 } 5011 5012 dev = __dev_get_by_index(net, ifm->ifa_index); 5013 if (!dev) { 5014 NL_SET_ERR_MSG_MOD(extack, "Unable to find the interface"); 5015 return -ENODEV; 5016 } 5017 5018 if (tb[IFA_FLAGS]) 5019 cfg.ifa_flags = nla_get_u32(tb[IFA_FLAGS]); 5020 else 5021 cfg.ifa_flags = ifm->ifa_flags; 5022 5023 /* We ignore other flags so far. */ 5024 cfg.ifa_flags &= IFA_F_NODAD | IFA_F_HOMEADDRESS | 5025 IFA_F_MANAGETEMPADDR | IFA_F_NOPREFIXROUTE | 5026 IFA_F_MCAUTOJOIN | IFA_F_OPTIMISTIC; 5027 5028 idev = ipv6_find_idev(dev); 5029 if (IS_ERR(idev)) 5030 return PTR_ERR(idev); 5031 5032 if (!ipv6_allow_optimistic_dad(net, idev)) 5033 cfg.ifa_flags &= ~IFA_F_OPTIMISTIC; 5034 5035 if (cfg.ifa_flags & IFA_F_NODAD && 5036 cfg.ifa_flags & IFA_F_OPTIMISTIC) { 5037 NL_SET_ERR_MSG(extack, "IFA_F_NODAD and IFA_F_OPTIMISTIC are mutually exclusive"); 5038 return -EINVAL; 5039 } 5040 5041 ifa = ipv6_get_ifaddr(net, cfg.pfx, dev, 1); 5042 if (!ifa) { 5043 /* 5044 * It would be best to check for !NLM_F_CREATE here but 5045 * userspace already relies on not having to provide this. 5046 */ 5047 return inet6_addr_add(net, ifm->ifa_index, &cfg, extack); 5048 } 5049 5050 if (nlh->nlmsg_flags & NLM_F_EXCL || 5051 !(nlh->nlmsg_flags & NLM_F_REPLACE)) { 5052 NL_SET_ERR_MSG_MOD(extack, "address already assigned"); 5053 err = -EEXIST; 5054 } else { 5055 err = inet6_addr_modify(net, ifa, &cfg); 5056 } 5057 5058 in6_ifa_put(ifa); 5059 5060 return err; 5061} 5062 5063static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u32 flags, 5064 u8 scope, int ifindex) 5065{ 5066 struct ifaddrmsg *ifm; 5067 5068 ifm = nlmsg_data(nlh); 5069 ifm->ifa_family = AF_INET6; 5070 ifm->ifa_prefixlen = prefixlen; 5071 ifm->ifa_flags = flags; 5072 ifm->ifa_scope = scope; 5073 ifm->ifa_index = ifindex; 5074} 5075 5076static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp, 5077 unsigned long tstamp, u32 preferred, u32 valid) 5078{ 5079 struct ifa_cacheinfo ci; 5080 5081 ci.cstamp = cstamp_delta(cstamp); 5082 ci.tstamp = cstamp_delta(tstamp); 5083 ci.ifa_prefered = preferred; 5084 ci.ifa_valid = valid; 5085 5086 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci); 5087} 5088 5089static inline int rt_scope(int ifa_scope) 5090{ 5091 if (ifa_scope & IFA_HOST) 5092 return RT_SCOPE_HOST; 5093 else if (ifa_scope & IFA_LINK) 5094 return RT_SCOPE_LINK; 5095 else if (ifa_scope & IFA_SITE) 5096 return RT_SCOPE_SITE; 5097 else 5098 return RT_SCOPE_UNIVERSE; 5099} 5100 5101static inline int inet6_ifaddr_msgsize(void) 5102{ 5103 return NLMSG_ALIGN(sizeof(struct ifaddrmsg)) 5104 + nla_total_size(16) /* IFA_LOCAL */ 5105 + nla_total_size(16) /* IFA_ADDRESS */ 5106 + nla_total_size(sizeof(struct ifa_cacheinfo)) 5107 + nla_total_size(4) /* IFA_FLAGS */ 5108 + nla_total_size(1) /* IFA_PROTO */ 5109 + nla_total_size(4) /* IFA_RT_PRIORITY */; 5110} 5111 5112enum addr_type_t { 5113 UNICAST_ADDR, 5114 MULTICAST_ADDR, 5115 ANYCAST_ADDR, 5116}; 5117 5118struct inet6_fill_args { 5119 u32 portid; 5120 u32 seq; 5121 int event; 5122 unsigned int flags; 5123 int netnsid; 5124 int ifindex; 5125 enum addr_type_t type; 5126}; 5127 5128static int inet6_fill_ifaddr(struct sk_buff *skb, 5129 const struct inet6_ifaddr *ifa, 5130 struct inet6_fill_args *args) 5131{ 5132 struct nlmsghdr *nlh; 5133 u32 preferred, valid; 5134 u32 flags, priority; 5135 u8 proto; 5136 5137 nlh = nlmsg_put(skb, args->portid, args->seq, args->event, 5138 sizeof(struct ifaddrmsg), args->flags); 5139 if (!nlh) 5140 return -EMSGSIZE; 5141 5142 flags = READ_ONCE(ifa->flags); 5143 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope), 5144 ifa->idev->dev->ifindex); 5145 5146 if (args->netnsid >= 0 && 5147 nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid)) 5148 goto error; 5149 5150 preferred = READ_ONCE(ifa->prefered_lft); 5151 valid = READ_ONCE(ifa->valid_lft); 5152 5153 if (!((flags & IFA_F_PERMANENT) && 5154 (preferred == INFINITY_LIFE_TIME))) { 5155 if (preferred != INFINITY_LIFE_TIME) { 5156 long tval = (jiffies - READ_ONCE(ifa->tstamp)) / HZ; 5157 5158 if (preferred > tval) 5159 preferred -= tval; 5160 else 5161 preferred = 0; 5162 if (valid != INFINITY_LIFE_TIME) { 5163 if (valid > tval) 5164 valid -= tval; 5165 else 5166 valid = 0; 5167 } 5168 } 5169 } else { 5170 preferred = INFINITY_LIFE_TIME; 5171 valid = INFINITY_LIFE_TIME; 5172 } 5173 5174 if (!ipv6_addr_any(&ifa->peer_addr)) { 5175 if (nla_put_in6_addr(skb, IFA_LOCAL, &ifa->addr) < 0 || 5176 nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->peer_addr) < 0) 5177 goto error; 5178 } else { 5179 if (nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->addr) < 0) 5180 goto error; 5181 } 5182 5183 priority = READ_ONCE(ifa->rt_priority); 5184 if (priority && nla_put_u32(skb, IFA_RT_PRIORITY, priority)) 5185 goto error; 5186 5187 if (put_cacheinfo(skb, ifa->cstamp, READ_ONCE(ifa->tstamp), 5188 preferred, valid) < 0) 5189 goto error; 5190 5191 if (nla_put_u32(skb, IFA_FLAGS, flags) < 0) 5192 goto error; 5193 5194 proto = READ_ONCE(ifa->ifa_proto); 5195 if (proto && nla_put_u8(skb, IFA_PROTO, proto)) 5196 goto error; 5197 5198 nlmsg_end(skb, nlh); 5199 return 0; 5200 5201error: 5202 nlmsg_cancel(skb, nlh); 5203 return -EMSGSIZE; 5204} 5205 5206static int inet6_fill_ifmcaddr(struct sk_buff *skb, 5207 const struct ifmcaddr6 *ifmca, 5208 struct inet6_fill_args *args) 5209{ 5210 int ifindex = ifmca->idev->dev->ifindex; 5211 u8 scope = RT_SCOPE_UNIVERSE; 5212 struct nlmsghdr *nlh; 5213 5214 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE) 5215 scope = RT_SCOPE_SITE; 5216 5217 nlh = nlmsg_put(skb, args->portid, args->seq, args->event, 5218 sizeof(struct ifaddrmsg), args->flags); 5219 if (!nlh) 5220 return -EMSGSIZE; 5221 5222 if (args->netnsid >= 0 && 5223 nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid)) { 5224 nlmsg_cancel(skb, nlh); 5225 return -EMSGSIZE; 5226 } 5227 5228 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 5229 if (nla_put_in6_addr(skb, IFA_MULTICAST, &ifmca->mca_addr) < 0 || 5230 put_cacheinfo(skb, ifmca->mca_cstamp, READ_ONCE(ifmca->mca_tstamp), 5231 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 5232 nlmsg_cancel(skb, nlh); 5233 return -EMSGSIZE; 5234 } 5235 5236 nlmsg_end(skb, nlh); 5237 return 0; 5238} 5239 5240static int inet6_fill_ifacaddr(struct sk_buff *skb, 5241 const struct ifacaddr6 *ifaca, 5242 struct inet6_fill_args *args) 5243{ 5244 struct net_device *dev = fib6_info_nh_dev(ifaca->aca_rt); 5245 int ifindex = dev ? dev->ifindex : 1; 5246 u8 scope = RT_SCOPE_UNIVERSE; 5247 struct nlmsghdr *nlh; 5248 5249 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE) 5250 scope = RT_SCOPE_SITE; 5251 5252 nlh = nlmsg_put(skb, args->portid, args->seq, args->event, 5253 sizeof(struct ifaddrmsg), args->flags); 5254 if (!nlh) 5255 return -EMSGSIZE; 5256 5257 if (args->netnsid >= 0 && 5258 nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid)) { 5259 nlmsg_cancel(skb, nlh); 5260 return -EMSGSIZE; 5261 } 5262 5263 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 5264 if (nla_put_in6_addr(skb, IFA_ANYCAST, &ifaca->aca_addr) < 0 || 5265 put_cacheinfo(skb, ifaca->aca_cstamp, READ_ONCE(ifaca->aca_tstamp), 5266 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 5267 nlmsg_cancel(skb, nlh); 5268 return -EMSGSIZE; 5269 } 5270 5271 nlmsg_end(skb, nlh); 5272 return 0; 5273} 5274 5275/* called with rcu_read_lock() */ 5276static int in6_dump_addrs(const struct inet6_dev *idev, struct sk_buff *skb, 5277 struct netlink_callback *cb, int *s_ip_idx, 5278 struct inet6_fill_args *fillargs) 5279{ 5280 const struct ifmcaddr6 *ifmca; 5281 const struct ifacaddr6 *ifaca; 5282 int ip_idx = 0; 5283 int err = 0; 5284 5285 switch (fillargs->type) { 5286 case UNICAST_ADDR: { 5287 const struct inet6_ifaddr *ifa; 5288 fillargs->event = RTM_NEWADDR; 5289 5290 /* unicast address incl. temp addr */ 5291 list_for_each_entry_rcu(ifa, &idev->addr_list, if_list) { 5292 if (ip_idx < *s_ip_idx) 5293 goto next; 5294 err = inet6_fill_ifaddr(skb, ifa, fillargs); 5295 if (err < 0) 5296 break; 5297 nl_dump_check_consistent(cb, nlmsg_hdr(skb)); 5298next: 5299 ip_idx++; 5300 } 5301 break; 5302 } 5303 case MULTICAST_ADDR: 5304 fillargs->event = RTM_GETMULTICAST; 5305 5306 /* multicast address */ 5307 for (ifmca = rcu_dereference(idev->mc_list); 5308 ifmca; 5309 ifmca = rcu_dereference(ifmca->next), ip_idx++) { 5310 if (ip_idx < *s_ip_idx) 5311 continue; 5312 err = inet6_fill_ifmcaddr(skb, ifmca, fillargs); 5313 if (err < 0) 5314 break; 5315 } 5316 break; 5317 case ANYCAST_ADDR: 5318 fillargs->event = RTM_GETANYCAST; 5319 /* anycast address */ 5320 for (ifaca = rcu_dereference(idev->ac_list); ifaca; 5321 ifaca = rcu_dereference(ifaca->aca_next), ip_idx++) { 5322 if (ip_idx < *s_ip_idx) 5323 continue; 5324 err = inet6_fill_ifacaddr(skb, ifaca, fillargs); 5325 if (err < 0) 5326 break; 5327 } 5328 break; 5329 default: 5330 break; 5331 } 5332 *s_ip_idx = err ? ip_idx : 0; 5333 return err; 5334} 5335 5336static int inet6_valid_dump_ifaddr_req(const struct nlmsghdr *nlh, 5337 struct inet6_fill_args *fillargs, 5338 struct net **tgt_net, struct sock *sk, 5339 struct netlink_callback *cb) 5340{ 5341 struct netlink_ext_ack *extack = cb->extack; 5342 struct nlattr *tb[IFA_MAX+1]; 5343 struct ifaddrmsg *ifm; 5344 int err, i; 5345 5346 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) { 5347 NL_SET_ERR_MSG_MOD(extack, "Invalid header for address dump request"); 5348 return -EINVAL; 5349 } 5350 5351 ifm = nlmsg_data(nlh); 5352 if (ifm->ifa_prefixlen || ifm->ifa_flags || ifm->ifa_scope) { 5353 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for address dump request"); 5354 return -EINVAL; 5355 } 5356 5357 fillargs->ifindex = ifm->ifa_index; 5358 if (fillargs->ifindex) { 5359 cb->answer_flags |= NLM_F_DUMP_FILTERED; 5360 fillargs->flags |= NLM_F_DUMP_FILTERED; 5361 } 5362 5363 err = nlmsg_parse_deprecated_strict(nlh, sizeof(*ifm), tb, IFA_MAX, 5364 ifa_ipv6_policy, extack); 5365 if (err < 0) 5366 return err; 5367 5368 for (i = 0; i <= IFA_MAX; ++i) { 5369 if (!tb[i]) 5370 continue; 5371 5372 if (i == IFA_TARGET_NETNSID) { 5373 struct net *net; 5374 5375 fillargs->netnsid = nla_get_s32(tb[i]); 5376 net = rtnl_get_net_ns_capable(sk, fillargs->netnsid); 5377 if (IS_ERR(net)) { 5378 fillargs->netnsid = -1; 5379 NL_SET_ERR_MSG_MOD(extack, "Invalid target network namespace id"); 5380 return PTR_ERR(net); 5381 } 5382 *tgt_net = net; 5383 } else { 5384 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in dump request"); 5385 return -EINVAL; 5386 } 5387 } 5388 5389 return 0; 5390} 5391 5392static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb, 5393 enum addr_type_t type) 5394{ 5395 struct net *tgt_net = sock_net(skb->sk); 5396 const struct nlmsghdr *nlh = cb->nlh; 5397 struct inet6_fill_args fillargs = { 5398 .portid = NETLINK_CB(cb->skb).portid, 5399 .seq = cb->nlh->nlmsg_seq, 5400 .flags = NLM_F_MULTI, 5401 .netnsid = -1, 5402 .type = type, 5403 }; 5404 struct { 5405 unsigned long ifindex; 5406 int ip_idx; 5407 } *ctx = (void *)cb->ctx; 5408 struct net_device *dev; 5409 struct inet6_dev *idev; 5410 int err = 0; 5411 5412 rcu_read_lock(); 5413 if (cb->strict_check) { 5414 err = inet6_valid_dump_ifaddr_req(nlh, &fillargs, &tgt_net, 5415 skb->sk, cb); 5416 if (err < 0) 5417 goto done; 5418 5419 err = 0; 5420 if (fillargs.ifindex) { 5421 dev = dev_get_by_index_rcu(tgt_net, fillargs.ifindex); 5422 if (!dev) { 5423 err = -ENODEV; 5424 goto done; 5425 } 5426 idev = __in6_dev_get(dev); 5427 if (idev) 5428 err = in6_dump_addrs(idev, skb, cb, 5429 &ctx->ip_idx, 5430 &fillargs); 5431 goto done; 5432 } 5433 } 5434 5435 cb->seq = inet6_base_seq(tgt_net); 5436 for_each_netdev_dump(tgt_net, dev, ctx->ifindex) { 5437 idev = __in6_dev_get(dev); 5438 if (!idev) 5439 continue; 5440 err = in6_dump_addrs(idev, skb, cb, &ctx->ip_idx, 5441 &fillargs); 5442 if (err < 0) 5443 goto done; 5444 } 5445done: 5446 rcu_read_unlock(); 5447 if (fillargs.netnsid >= 0) 5448 put_net(tgt_net); 5449 5450 return err; 5451} 5452 5453static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb) 5454{ 5455 enum addr_type_t type = UNICAST_ADDR; 5456 5457 return inet6_dump_addr(skb, cb, type); 5458} 5459 5460static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb) 5461{ 5462 enum addr_type_t type = MULTICAST_ADDR; 5463 5464 return inet6_dump_addr(skb, cb, type); 5465} 5466 5467 5468static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb) 5469{ 5470 enum addr_type_t type = ANYCAST_ADDR; 5471 5472 return inet6_dump_addr(skb, cb, type); 5473} 5474 5475static int inet6_rtm_valid_getaddr_req(struct sk_buff *skb, 5476 const struct nlmsghdr *nlh, 5477 struct nlattr **tb, 5478 struct netlink_ext_ack *extack) 5479{ 5480 struct ifaddrmsg *ifm; 5481 int i, err; 5482 5483 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) { 5484 NL_SET_ERR_MSG_MOD(extack, "Invalid header for get address request"); 5485 return -EINVAL; 5486 } 5487 5488 if (!netlink_strict_get_check(skb)) 5489 return nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX, 5490 ifa_ipv6_policy, extack); 5491 5492 ifm = nlmsg_data(nlh); 5493 if (ifm->ifa_prefixlen || ifm->ifa_flags || ifm->ifa_scope) { 5494 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for get address request"); 5495 return -EINVAL; 5496 } 5497 5498 err = nlmsg_parse_deprecated_strict(nlh, sizeof(*ifm), tb, IFA_MAX, 5499 ifa_ipv6_policy, extack); 5500 if (err) 5501 return err; 5502 5503 for (i = 0; i <= IFA_MAX; i++) { 5504 if (!tb[i]) 5505 continue; 5506 5507 switch (i) { 5508 case IFA_TARGET_NETNSID: 5509 case IFA_ADDRESS: 5510 case IFA_LOCAL: 5511 break; 5512 default: 5513 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in get address request"); 5514 return -EINVAL; 5515 } 5516 } 5517 5518 return 0; 5519} 5520 5521static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh, 5522 struct netlink_ext_ack *extack) 5523{ 5524 struct net *tgt_net = sock_net(in_skb->sk); 5525 struct inet6_fill_args fillargs = { 5526 .portid = NETLINK_CB(in_skb).portid, 5527 .seq = nlh->nlmsg_seq, 5528 .event = RTM_NEWADDR, 5529 .flags = 0, 5530 .netnsid = -1, 5531 }; 5532 struct ifaddrmsg *ifm; 5533 struct nlattr *tb[IFA_MAX+1]; 5534 struct in6_addr *addr = NULL, *peer; 5535 struct net_device *dev = NULL; 5536 struct inet6_ifaddr *ifa; 5537 struct sk_buff *skb; 5538 int err; 5539 5540 err = inet6_rtm_valid_getaddr_req(in_skb, nlh, tb, extack); 5541 if (err < 0) 5542 return err; 5543 5544 if (tb[IFA_TARGET_NETNSID]) { 5545 fillargs.netnsid = nla_get_s32(tb[IFA_TARGET_NETNSID]); 5546 5547 tgt_net = rtnl_get_net_ns_capable(NETLINK_CB(in_skb).sk, 5548 fillargs.netnsid); 5549 if (IS_ERR(tgt_net)) 5550 return PTR_ERR(tgt_net); 5551 } 5552 5553 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer); 5554 if (!addr) { 5555 err = -EINVAL; 5556 goto errout; 5557 } 5558 ifm = nlmsg_data(nlh); 5559 if (ifm->ifa_index) 5560 dev = dev_get_by_index(tgt_net, ifm->ifa_index); 5561 5562 ifa = ipv6_get_ifaddr(tgt_net, addr, dev, 1); 5563 if (!ifa) { 5564 err = -EADDRNOTAVAIL; 5565 goto errout; 5566 } 5567 5568 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL); 5569 if (!skb) { 5570 err = -ENOBUFS; 5571 goto errout_ifa; 5572 } 5573 5574 err = inet6_fill_ifaddr(skb, ifa, &fillargs); 5575 if (err < 0) { 5576 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 5577 WARN_ON(err == -EMSGSIZE); 5578 kfree_skb(skb); 5579 goto errout_ifa; 5580 } 5581 err = rtnl_unicast(skb, tgt_net, NETLINK_CB(in_skb).portid); 5582errout_ifa: 5583 in6_ifa_put(ifa); 5584errout: 5585 dev_put(dev); 5586 if (fillargs.netnsid >= 0) 5587 put_net(tgt_net); 5588 5589 return err; 5590} 5591 5592static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa) 5593{ 5594 struct sk_buff *skb; 5595 struct net *net = dev_net(ifa->idev->dev); 5596 struct inet6_fill_args fillargs = { 5597 .portid = 0, 5598 .seq = 0, 5599 .event = event, 5600 .flags = 0, 5601 .netnsid = -1, 5602 }; 5603 int err = -ENOBUFS; 5604 5605 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC); 5606 if (!skb) 5607 goto errout; 5608 5609 err = inet6_fill_ifaddr(skb, ifa, &fillargs); 5610 if (err < 0) { 5611 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 5612 WARN_ON(err == -EMSGSIZE); 5613 kfree_skb(skb); 5614 goto errout; 5615 } 5616 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC); 5617 return; 5618errout: 5619 if (err < 0) 5620 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err); 5621} 5622 5623static void ipv6_store_devconf(const struct ipv6_devconf *cnf, 5624 __s32 *array, int bytes) 5625{ 5626 BUG_ON(bytes < (DEVCONF_MAX * 4)); 5627 5628 memset(array, 0, bytes); 5629 array[DEVCONF_FORWARDING] = READ_ONCE(cnf->forwarding); 5630 array[DEVCONF_HOPLIMIT] = READ_ONCE(cnf->hop_limit); 5631 array[DEVCONF_MTU6] = READ_ONCE(cnf->mtu6); 5632 array[DEVCONF_ACCEPT_RA] = READ_ONCE(cnf->accept_ra); 5633 array[DEVCONF_ACCEPT_REDIRECTS] = READ_ONCE(cnf->accept_redirects); 5634 array[DEVCONF_AUTOCONF] = READ_ONCE(cnf->autoconf); 5635 array[DEVCONF_DAD_TRANSMITS] = READ_ONCE(cnf->dad_transmits); 5636 array[DEVCONF_RTR_SOLICITS] = READ_ONCE(cnf->rtr_solicits); 5637 array[DEVCONF_RTR_SOLICIT_INTERVAL] = 5638 jiffies_to_msecs(READ_ONCE(cnf->rtr_solicit_interval)); 5639 array[DEVCONF_RTR_SOLICIT_MAX_INTERVAL] = 5640 jiffies_to_msecs(READ_ONCE(cnf->rtr_solicit_max_interval)); 5641 array[DEVCONF_RTR_SOLICIT_DELAY] = 5642 jiffies_to_msecs(READ_ONCE(cnf->rtr_solicit_delay)); 5643 array[DEVCONF_FORCE_MLD_VERSION] = READ_ONCE(cnf->force_mld_version); 5644 array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] = 5645 jiffies_to_msecs(READ_ONCE(cnf->mldv1_unsolicited_report_interval)); 5646 array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] = 5647 jiffies_to_msecs(READ_ONCE(cnf->mldv2_unsolicited_report_interval)); 5648 array[DEVCONF_USE_TEMPADDR] = READ_ONCE(cnf->use_tempaddr); 5649 array[DEVCONF_TEMP_VALID_LFT] = READ_ONCE(cnf->temp_valid_lft); 5650 array[DEVCONF_TEMP_PREFERED_LFT] = READ_ONCE(cnf->temp_prefered_lft); 5651 array[DEVCONF_REGEN_MAX_RETRY] = READ_ONCE(cnf->regen_max_retry); 5652 array[DEVCONF_MAX_DESYNC_FACTOR] = READ_ONCE(cnf->max_desync_factor); 5653 array[DEVCONF_MAX_ADDRESSES] = READ_ONCE(cnf->max_addresses); 5654 array[DEVCONF_ACCEPT_RA_DEFRTR] = READ_ONCE(cnf->accept_ra_defrtr); 5655 array[DEVCONF_RA_DEFRTR_METRIC] = READ_ONCE(cnf->ra_defrtr_metric); 5656 array[DEVCONF_ACCEPT_RA_MIN_HOP_LIMIT] = 5657 READ_ONCE(cnf->accept_ra_min_hop_limit); 5658 array[DEVCONF_ACCEPT_RA_PINFO] = READ_ONCE(cnf->accept_ra_pinfo); 5659#ifdef CONFIG_IPV6_ROUTER_PREF 5660 array[DEVCONF_ACCEPT_RA_RTR_PREF] = READ_ONCE(cnf->accept_ra_rtr_pref); 5661 array[DEVCONF_RTR_PROBE_INTERVAL] = 5662 jiffies_to_msecs(READ_ONCE(cnf->rtr_probe_interval)); 5663#ifdef CONFIG_IPV6_ROUTE_INFO 5664 array[DEVCONF_ACCEPT_RA_RT_INFO_MIN_PLEN] = 5665 READ_ONCE(cnf->accept_ra_rt_info_min_plen); 5666 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = 5667 READ_ONCE(cnf->accept_ra_rt_info_max_plen); 5668#endif 5669#endif 5670 array[DEVCONF_PROXY_NDP] = READ_ONCE(cnf->proxy_ndp); 5671 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = 5672 READ_ONCE(cnf->accept_source_route); 5673#ifdef CONFIG_IPV6_OPTIMISTIC_DAD 5674 array[DEVCONF_OPTIMISTIC_DAD] = READ_ONCE(cnf->optimistic_dad); 5675 array[DEVCONF_USE_OPTIMISTIC] = READ_ONCE(cnf->use_optimistic); 5676#endif 5677#ifdef CONFIG_IPV6_MROUTE 5678 array[DEVCONF_MC_FORWARDING] = atomic_read(&cnf->mc_forwarding); 5679#endif 5680 array[DEVCONF_DISABLE_IPV6] = READ_ONCE(cnf->disable_ipv6); 5681 array[DEVCONF_ACCEPT_DAD] = READ_ONCE(cnf->accept_dad); 5682 array[DEVCONF_FORCE_TLLAO] = READ_ONCE(cnf->force_tllao); 5683 array[DEVCONF_NDISC_NOTIFY] = READ_ONCE(cnf->ndisc_notify); 5684 array[DEVCONF_SUPPRESS_FRAG_NDISC] = 5685 READ_ONCE(cnf->suppress_frag_ndisc); 5686 array[DEVCONF_ACCEPT_RA_FROM_LOCAL] = 5687 READ_ONCE(cnf->accept_ra_from_local); 5688 array[DEVCONF_ACCEPT_RA_MTU] = READ_ONCE(cnf->accept_ra_mtu); 5689 array[DEVCONF_IGNORE_ROUTES_WITH_LINKDOWN] = 5690 READ_ONCE(cnf->ignore_routes_with_linkdown); 5691 /* we omit DEVCONF_STABLE_SECRET for now */ 5692 array[DEVCONF_USE_OIF_ADDRS_ONLY] = READ_ONCE(cnf->use_oif_addrs_only); 5693 array[DEVCONF_DROP_UNICAST_IN_L2_MULTICAST] = 5694 READ_ONCE(cnf->drop_unicast_in_l2_multicast); 5695 array[DEVCONF_DROP_UNSOLICITED_NA] = READ_ONCE(cnf->drop_unsolicited_na); 5696 array[DEVCONF_KEEP_ADDR_ON_DOWN] = READ_ONCE(cnf->keep_addr_on_down); 5697 array[DEVCONF_SEG6_ENABLED] = READ_ONCE(cnf->seg6_enabled); 5698#ifdef CONFIG_IPV6_SEG6_HMAC 5699 array[DEVCONF_SEG6_REQUIRE_HMAC] = READ_ONCE(cnf->seg6_require_hmac); 5700#endif 5701 array[DEVCONF_ENHANCED_DAD] = READ_ONCE(cnf->enhanced_dad); 5702 array[DEVCONF_ADDR_GEN_MODE] = READ_ONCE(cnf->addr_gen_mode); 5703 array[DEVCONF_DISABLE_POLICY] = READ_ONCE(cnf->disable_policy); 5704 array[DEVCONF_NDISC_TCLASS] = READ_ONCE(cnf->ndisc_tclass); 5705 array[DEVCONF_RPL_SEG_ENABLED] = READ_ONCE(cnf->rpl_seg_enabled); 5706 array[DEVCONF_IOAM6_ENABLED] = READ_ONCE(cnf->ioam6_enabled); 5707 array[DEVCONF_IOAM6_ID] = READ_ONCE(cnf->ioam6_id); 5708 array[DEVCONF_IOAM6_ID_WIDE] = READ_ONCE(cnf->ioam6_id_wide); 5709 array[DEVCONF_NDISC_EVICT_NOCARRIER] = 5710 READ_ONCE(cnf->ndisc_evict_nocarrier); 5711 array[DEVCONF_ACCEPT_UNTRACKED_NA] = 5712 READ_ONCE(cnf->accept_untracked_na); 5713 array[DEVCONF_ACCEPT_RA_MIN_LFT] = READ_ONCE(cnf->accept_ra_min_lft); 5714} 5715 5716static inline size_t inet6_ifla6_size(void) 5717{ 5718 return nla_total_size(4) /* IFLA_INET6_FLAGS */ 5719 + nla_total_size(sizeof(struct ifla_cacheinfo)) 5720 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */ 5721 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */ 5722 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */ 5723 + nla_total_size(sizeof(struct in6_addr)) /* IFLA_INET6_TOKEN */ 5724 + nla_total_size(1) /* IFLA_INET6_ADDR_GEN_MODE */ 5725 + nla_total_size(4) /* IFLA_INET6_RA_MTU */ 5726 + 0; 5727} 5728 5729static inline size_t inet6_if_nlmsg_size(void) 5730{ 5731 return NLMSG_ALIGN(sizeof(struct ifinfomsg)) 5732 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */ 5733 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */ 5734 + nla_total_size(4) /* IFLA_MTU */ 5735 + nla_total_size(4) /* IFLA_LINK */ 5736 + nla_total_size(1) /* IFLA_OPERSTATE */ 5737 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */ 5738} 5739 5740static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib, 5741 int bytes) 5742{ 5743 int i; 5744 int pad = bytes - sizeof(u64) * ICMP6_MIB_MAX; 5745 BUG_ON(pad < 0); 5746 5747 /* Use put_unaligned() because stats may not be aligned for u64. */ 5748 put_unaligned(ICMP6_MIB_MAX, &stats[0]); 5749 for (i = 1; i < ICMP6_MIB_MAX; i++) 5750 put_unaligned(atomic_long_read(&mib[i]), &stats[i]); 5751 5752 memset(&stats[ICMP6_MIB_MAX], 0, pad); 5753} 5754 5755static inline void __snmp6_fill_stats64(u64 *stats, void __percpu *mib, 5756 int bytes, size_t syncpoff) 5757{ 5758 int i, c; 5759 u64 buff[IPSTATS_MIB_MAX]; 5760 int pad = bytes - sizeof(u64) * IPSTATS_MIB_MAX; 5761 5762 BUG_ON(pad < 0); 5763 5764 memset(buff, 0, sizeof(buff)); 5765 buff[0] = IPSTATS_MIB_MAX; 5766 5767 for_each_possible_cpu(c) { 5768 for (i = 1; i < IPSTATS_MIB_MAX; i++) 5769 buff[i] += snmp_get_cpu_field64(mib, c, i, syncpoff); 5770 } 5771 5772 memcpy(stats, buff, IPSTATS_MIB_MAX * sizeof(u64)); 5773 memset(&stats[IPSTATS_MIB_MAX], 0, pad); 5774} 5775 5776static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype, 5777 int bytes) 5778{ 5779 switch (attrtype) { 5780 case IFLA_INET6_STATS: 5781 __snmp6_fill_stats64(stats, idev->stats.ipv6, bytes, 5782 offsetof(struct ipstats_mib, syncp)); 5783 break; 5784 case IFLA_INET6_ICMP6STATS: 5785 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, bytes); 5786 break; 5787 } 5788} 5789 5790static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev, 5791 u32 ext_filter_mask) 5792{ 5793 struct ifla_cacheinfo ci; 5794 struct nlattr *nla; 5795 u32 ra_mtu; 5796 5797 if (nla_put_u32(skb, IFLA_INET6_FLAGS, READ_ONCE(idev->if_flags))) 5798 goto nla_put_failure; 5799 ci.max_reasm_len = IPV6_MAXPLEN; 5800 ci.tstamp = cstamp_delta(READ_ONCE(idev->tstamp)); 5801 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time); 5802 ci.retrans_time = jiffies_to_msecs(NEIGH_VAR(idev->nd_parms, RETRANS_TIME)); 5803 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci)) 5804 goto nla_put_failure; 5805 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32)); 5806 if (!nla) 5807 goto nla_put_failure; 5808 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla)); 5809 5810 /* XXX - MC not implemented */ 5811 5812 if (ext_filter_mask & RTEXT_FILTER_SKIP_STATS) 5813 return 0; 5814 5815 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64)); 5816 if (!nla) 5817 goto nla_put_failure; 5818 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla)); 5819 5820 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64)); 5821 if (!nla) 5822 goto nla_put_failure; 5823 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla)); 5824 5825 nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr)); 5826 if (!nla) 5827 goto nla_put_failure; 5828 read_lock_bh(&idev->lock); 5829 memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla)); 5830 read_unlock_bh(&idev->lock); 5831 5832 if (nla_put_u8(skb, IFLA_INET6_ADDR_GEN_MODE, 5833 READ_ONCE(idev->cnf.addr_gen_mode))) 5834 goto nla_put_failure; 5835 5836 ra_mtu = READ_ONCE(idev->ra_mtu); 5837 if (ra_mtu && nla_put_u32(skb, IFLA_INET6_RA_MTU, ra_mtu)) 5838 goto nla_put_failure; 5839 5840 return 0; 5841 5842nla_put_failure: 5843 return -EMSGSIZE; 5844} 5845 5846static size_t inet6_get_link_af_size(const struct net_device *dev, 5847 u32 ext_filter_mask) 5848{ 5849 if (!__in6_dev_get(dev)) 5850 return 0; 5851 5852 return inet6_ifla6_size(); 5853} 5854 5855static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev, 5856 u32 ext_filter_mask) 5857{ 5858 struct inet6_dev *idev = __in6_dev_get(dev); 5859 5860 if (!idev) 5861 return -ENODATA; 5862 5863 if (inet6_fill_ifla6_attrs(skb, idev, ext_filter_mask) < 0) 5864 return -EMSGSIZE; 5865 5866 return 0; 5867} 5868 5869static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token, 5870 struct netlink_ext_ack *extack) 5871{ 5872 struct inet6_ifaddr *ifp; 5873 struct net_device *dev = idev->dev; 5874 bool clear_token, update_rs = false; 5875 struct in6_addr ll_addr; 5876 5877 ASSERT_RTNL(); 5878 5879 if (!token) 5880 return -EINVAL; 5881 5882 if (dev->flags & IFF_LOOPBACK) { 5883 NL_SET_ERR_MSG_MOD(extack, "Device is loopback"); 5884 return -EINVAL; 5885 } 5886 5887 if (dev->flags & IFF_NOARP) { 5888 NL_SET_ERR_MSG_MOD(extack, 5889 "Device does not do neighbour discovery"); 5890 return -EINVAL; 5891 } 5892 5893 if (!ipv6_accept_ra(idev)) { 5894 NL_SET_ERR_MSG_MOD(extack, 5895 "Router advertisement is disabled on device"); 5896 return -EINVAL; 5897 } 5898 5899 if (READ_ONCE(idev->cnf.rtr_solicits) == 0) { 5900 NL_SET_ERR_MSG(extack, 5901 "Router solicitation is disabled on device"); 5902 return -EINVAL; 5903 } 5904 5905 write_lock_bh(&idev->lock); 5906 5907 BUILD_BUG_ON(sizeof(token->s6_addr) != 16); 5908 memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8); 5909 5910 write_unlock_bh(&idev->lock); 5911 5912 clear_token = ipv6_addr_any(token); 5913 if (clear_token) 5914 goto update_lft; 5915 5916 if (!idev->dead && (idev->if_flags & IF_READY) && 5917 !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE | 5918 IFA_F_OPTIMISTIC)) { 5919 /* If we're not ready, then normal ifup will take care 5920 * of this. Otherwise, we need to request our rs here. 5921 */ 5922 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters); 5923 update_rs = true; 5924 } 5925 5926update_lft: 5927 write_lock_bh(&idev->lock); 5928 5929 if (update_rs) { 5930 idev->if_flags |= IF_RS_SENT; 5931 idev->rs_interval = rfc3315_s14_backoff_init( 5932 READ_ONCE(idev->cnf.rtr_solicit_interval)); 5933 idev->rs_probes = 1; 5934 addrconf_mod_rs_timer(idev, idev->rs_interval); 5935 } 5936 5937 /* Well, that's kinda nasty ... */ 5938 list_for_each_entry(ifp, &idev->addr_list, if_list) { 5939 spin_lock(&ifp->lock); 5940 if (ifp->tokenized) { 5941 ifp->valid_lft = 0; 5942 ifp->prefered_lft = 0; 5943 } 5944 spin_unlock(&ifp->lock); 5945 } 5946 5947 write_unlock_bh(&idev->lock); 5948 inet6_ifinfo_notify(RTM_NEWLINK, idev); 5949 addrconf_verify_rtnl(dev_net(dev)); 5950 return 0; 5951} 5952 5953static const struct nla_policy inet6_af_policy[IFLA_INET6_MAX + 1] = { 5954 [IFLA_INET6_ADDR_GEN_MODE] = { .type = NLA_U8 }, 5955 [IFLA_INET6_TOKEN] = { .len = sizeof(struct in6_addr) }, 5956 [IFLA_INET6_RA_MTU] = { .type = NLA_REJECT, 5957 .reject_message = 5958 "IFLA_INET6_RA_MTU can not be set" }, 5959}; 5960 5961static int check_addr_gen_mode(int mode) 5962{ 5963 if (mode != IN6_ADDR_GEN_MODE_EUI64 && 5964 mode != IN6_ADDR_GEN_MODE_NONE && 5965 mode != IN6_ADDR_GEN_MODE_STABLE_PRIVACY && 5966 mode != IN6_ADDR_GEN_MODE_RANDOM) 5967 return -EINVAL; 5968 return 1; 5969} 5970 5971static int check_stable_privacy(struct inet6_dev *idev, struct net *net, 5972 int mode) 5973{ 5974 if (mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY && 5975 !idev->cnf.stable_secret.initialized && 5976 !net->ipv6.devconf_dflt->stable_secret.initialized) 5977 return -EINVAL; 5978 return 1; 5979} 5980 5981static int inet6_validate_link_af(const struct net_device *dev, 5982 const struct nlattr *nla, 5983 struct netlink_ext_ack *extack) 5984{ 5985 struct nlattr *tb[IFLA_INET6_MAX + 1]; 5986 struct inet6_dev *idev = NULL; 5987 int err; 5988 5989 if (dev) { 5990 idev = __in6_dev_get(dev); 5991 if (!idev) 5992 return -EAFNOSUPPORT; 5993 } 5994 5995 err = nla_parse_nested_deprecated(tb, IFLA_INET6_MAX, nla, 5996 inet6_af_policy, extack); 5997 if (err) 5998 return err; 5999 6000 if (!tb[IFLA_INET6_TOKEN] && !tb[IFLA_INET6_ADDR_GEN_MODE]) 6001 return -EINVAL; 6002 6003 if (tb[IFLA_INET6_ADDR_GEN_MODE]) { 6004 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]); 6005 6006 if (check_addr_gen_mode(mode) < 0) 6007 return -EINVAL; 6008 if (dev && check_stable_privacy(idev, dev_net(dev), mode) < 0) 6009 return -EINVAL; 6010 } 6011 6012 return 0; 6013} 6014 6015static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla, 6016 struct netlink_ext_ack *extack) 6017{ 6018 struct inet6_dev *idev = __in6_dev_get(dev); 6019 struct nlattr *tb[IFLA_INET6_MAX + 1]; 6020 int err; 6021 6022 if (!idev) 6023 return -EAFNOSUPPORT; 6024 6025 if (nla_parse_nested_deprecated(tb, IFLA_INET6_MAX, nla, NULL, NULL) < 0) 6026 return -EINVAL; 6027 6028 if (tb[IFLA_INET6_TOKEN]) { 6029 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN]), 6030 extack); 6031 if (err) 6032 return err; 6033 } 6034 6035 if (tb[IFLA_INET6_ADDR_GEN_MODE]) { 6036 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]); 6037 6038 WRITE_ONCE(idev->cnf.addr_gen_mode, mode); 6039 } 6040 6041 return 0; 6042} 6043 6044static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev, 6045 u32 portid, u32 seq, int event, unsigned int flags) 6046{ 6047 struct net_device *dev = idev->dev; 6048 struct ifinfomsg *hdr; 6049 struct nlmsghdr *nlh; 6050 int ifindex, iflink; 6051 void *protoinfo; 6052 6053 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags); 6054 if (!nlh) 6055 return -EMSGSIZE; 6056 6057 hdr = nlmsg_data(nlh); 6058 hdr->ifi_family = AF_INET6; 6059 hdr->__ifi_pad = 0; 6060 hdr->ifi_type = dev->type; 6061 ifindex = READ_ONCE(dev->ifindex); 6062 hdr->ifi_index = ifindex; 6063 hdr->ifi_flags = dev_get_flags(dev); 6064 hdr->ifi_change = 0; 6065 6066 iflink = dev_get_iflink(dev); 6067 if (nla_put_string(skb, IFLA_IFNAME, dev->name) || 6068 (dev->addr_len && 6069 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) || 6070 nla_put_u32(skb, IFLA_MTU, READ_ONCE(dev->mtu)) || 6071 (ifindex != iflink && 6072 nla_put_u32(skb, IFLA_LINK, iflink)) || 6073 nla_put_u8(skb, IFLA_OPERSTATE, 6074 netif_running(dev) ? READ_ONCE(dev->operstate) : IF_OPER_DOWN)) 6075 goto nla_put_failure; 6076 protoinfo = nla_nest_start_noflag(skb, IFLA_PROTINFO); 6077 if (!protoinfo) 6078 goto nla_put_failure; 6079 6080 if (inet6_fill_ifla6_attrs(skb, idev, 0) < 0) 6081 goto nla_put_failure; 6082 6083 nla_nest_end(skb, protoinfo); 6084 nlmsg_end(skb, nlh); 6085 return 0; 6086 6087nla_put_failure: 6088 nlmsg_cancel(skb, nlh); 6089 return -EMSGSIZE; 6090} 6091 6092static int inet6_valid_dump_ifinfo(const struct nlmsghdr *nlh, 6093 struct netlink_ext_ack *extack) 6094{ 6095 struct ifinfomsg *ifm; 6096 6097 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) { 6098 NL_SET_ERR_MSG_MOD(extack, "Invalid header for link dump request"); 6099 return -EINVAL; 6100 } 6101 6102 if (nlmsg_attrlen(nlh, sizeof(*ifm))) { 6103 NL_SET_ERR_MSG_MOD(extack, "Invalid data after header"); 6104 return -EINVAL; 6105 } 6106 6107 ifm = nlmsg_data(nlh); 6108 if (ifm->__ifi_pad || ifm->ifi_type || ifm->ifi_flags || 6109 ifm->ifi_change || ifm->ifi_index) { 6110 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for dump request"); 6111 return -EINVAL; 6112 } 6113 6114 return 0; 6115} 6116 6117static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb) 6118{ 6119 struct net *net = sock_net(skb->sk); 6120 struct { 6121 unsigned long ifindex; 6122 } *ctx = (void *)cb->ctx; 6123 struct net_device *dev; 6124 struct inet6_dev *idev; 6125 int err; 6126 6127 /* only requests using strict checking can pass data to 6128 * influence the dump 6129 */ 6130 if (cb->strict_check) { 6131 err = inet6_valid_dump_ifinfo(cb->nlh, cb->extack); 6132 6133 if (err < 0) 6134 return err; 6135 } 6136 6137 err = 0; 6138 rcu_read_lock(); 6139 for_each_netdev_dump(net, dev, ctx->ifindex) { 6140 idev = __in6_dev_get(dev); 6141 if (!idev) 6142 continue; 6143 err = inet6_fill_ifinfo(skb, idev, 6144 NETLINK_CB(cb->skb).portid, 6145 cb->nlh->nlmsg_seq, 6146 RTM_NEWLINK, NLM_F_MULTI); 6147 if (err < 0) 6148 break; 6149 } 6150 rcu_read_unlock(); 6151 6152 return err; 6153} 6154 6155void inet6_ifinfo_notify(int event, struct inet6_dev *idev) 6156{ 6157 struct sk_buff *skb; 6158 struct net *net = dev_net(idev->dev); 6159 int err = -ENOBUFS; 6160 6161 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC); 6162 if (!skb) 6163 goto errout; 6164 6165 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0); 6166 if (err < 0) { 6167 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */ 6168 WARN_ON(err == -EMSGSIZE); 6169 kfree_skb(skb); 6170 goto errout; 6171 } 6172 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC); 6173 return; 6174errout: 6175 if (err < 0) 6176 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err); 6177} 6178 6179static inline size_t inet6_prefix_nlmsg_size(void) 6180{ 6181 return NLMSG_ALIGN(sizeof(struct prefixmsg)) 6182 + nla_total_size(sizeof(struct in6_addr)) 6183 + nla_total_size(sizeof(struct prefix_cacheinfo)); 6184} 6185 6186static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev, 6187 struct prefix_info *pinfo, u32 portid, u32 seq, 6188 int event, unsigned int flags) 6189{ 6190 struct prefixmsg *pmsg; 6191 struct nlmsghdr *nlh; 6192 struct prefix_cacheinfo ci; 6193 6194 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags); 6195 if (!nlh) 6196 return -EMSGSIZE; 6197 6198 pmsg = nlmsg_data(nlh); 6199 pmsg->prefix_family = AF_INET6; 6200 pmsg->prefix_pad1 = 0; 6201 pmsg->prefix_pad2 = 0; 6202 pmsg->prefix_ifindex = idev->dev->ifindex; 6203 pmsg->prefix_len = pinfo->prefix_len; 6204 pmsg->prefix_type = pinfo->type; 6205 pmsg->prefix_pad3 = 0; 6206 pmsg->prefix_flags = pinfo->flags; 6207 6208 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix)) 6209 goto nla_put_failure; 6210 ci.preferred_time = ntohl(pinfo->prefered); 6211 ci.valid_time = ntohl(pinfo->valid); 6212 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci)) 6213 goto nla_put_failure; 6214 nlmsg_end(skb, nlh); 6215 return 0; 6216 6217nla_put_failure: 6218 nlmsg_cancel(skb, nlh); 6219 return -EMSGSIZE; 6220} 6221 6222static void inet6_prefix_notify(int event, struct inet6_dev *idev, 6223 struct prefix_info *pinfo) 6224{ 6225 struct sk_buff *skb; 6226 struct net *net = dev_net(idev->dev); 6227 int err = -ENOBUFS; 6228 6229 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC); 6230 if (!skb) 6231 goto errout; 6232 6233 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0); 6234 if (err < 0) { 6235 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */ 6236 WARN_ON(err == -EMSGSIZE); 6237 kfree_skb(skb); 6238 goto errout; 6239 } 6240 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC); 6241 return; 6242errout: 6243 if (err < 0) 6244 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err); 6245} 6246 6247static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 6248{ 6249 struct net *net = dev_net(ifp->idev->dev); 6250 6251 if (event) 6252 ASSERT_RTNL(); 6253 6254 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp); 6255 6256 switch (event) { 6257 case RTM_NEWADDR: 6258 /* 6259 * If the address was optimistic we inserted the route at the 6260 * start of our DAD process, so we don't need to do it again. 6261 * If the device was taken down in the middle of the DAD 6262 * cycle there is a race where we could get here without a 6263 * host route, so nothing to insert. That will be fixed when 6264 * the device is brought up. 6265 */ 6266 if (ifp->rt && !rcu_access_pointer(ifp->rt->fib6_node)) { 6267 ip6_ins_rt(net, ifp->rt); 6268 } else if (!ifp->rt && (ifp->idev->dev->flags & IFF_UP)) { 6269 pr_warn("BUG: Address %pI6c on device %s is missing its host route.\n", 6270 &ifp->addr, ifp->idev->dev->name); 6271 } 6272 6273 if (ifp->idev->cnf.forwarding) 6274 addrconf_join_anycast(ifp); 6275 if (!ipv6_addr_any(&ifp->peer_addr)) 6276 addrconf_prefix_route(&ifp->peer_addr, 128, 6277 ifp->rt_priority, ifp->idev->dev, 6278 0, 0, GFP_ATOMIC); 6279 break; 6280 case RTM_DELADDR: 6281 if (ifp->idev->cnf.forwarding) 6282 addrconf_leave_anycast(ifp); 6283 addrconf_leave_solict(ifp->idev, &ifp->addr); 6284 if (!ipv6_addr_any(&ifp->peer_addr)) { 6285 struct fib6_info *rt; 6286 6287 rt = addrconf_get_prefix_route(&ifp->peer_addr, 128, 6288 ifp->idev->dev, 0, 0, 6289 false); 6290 if (rt) 6291 ip6_del_rt(net, rt, false); 6292 } 6293 if (ifp->rt) { 6294 ip6_del_rt(net, ifp->rt, false); 6295 ifp->rt = NULL; 6296 } 6297 rt_genid_bump_ipv6(net); 6298 break; 6299 } 6300 atomic_inc(&net->ipv6.dev_addr_genid); 6301} 6302 6303static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 6304{ 6305 if (likely(ifp->idev->dead == 0)) 6306 __ipv6_ifa_notify(event, ifp); 6307} 6308 6309#ifdef CONFIG_SYSCTL 6310 6311static int addrconf_sysctl_forward(struct ctl_table *ctl, int write, 6312 void *buffer, size_t *lenp, loff_t *ppos) 6313{ 6314 int *valp = ctl->data; 6315 int val = *valp; 6316 loff_t pos = *ppos; 6317 struct ctl_table lctl; 6318 int ret; 6319 6320 /* 6321 * ctl->data points to idev->cnf.forwarding, we should 6322 * not modify it until we get the rtnl lock. 6323 */ 6324 lctl = *ctl; 6325 lctl.data = &val; 6326 6327 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 6328 6329 if (write) 6330 ret = addrconf_fixup_forwarding(ctl, valp, val); 6331 if (ret) 6332 *ppos = pos; 6333 return ret; 6334} 6335 6336static int addrconf_sysctl_mtu(struct ctl_table *ctl, int write, 6337 void *buffer, size_t *lenp, loff_t *ppos) 6338{ 6339 struct inet6_dev *idev = ctl->extra1; 6340 int min_mtu = IPV6_MIN_MTU; 6341 struct ctl_table lctl; 6342 6343 lctl = *ctl; 6344 lctl.extra1 = &min_mtu; 6345 lctl.extra2 = idev ? &idev->dev->mtu : NULL; 6346 6347 return proc_dointvec_minmax(&lctl, write, buffer, lenp, ppos); 6348} 6349 6350static void dev_disable_change(struct inet6_dev *idev) 6351{ 6352 struct netdev_notifier_info info; 6353 6354 if (!idev || !idev->dev) 6355 return; 6356 6357 netdev_notifier_info_init(&info, idev->dev); 6358 if (idev->cnf.disable_ipv6) 6359 addrconf_notify(NULL, NETDEV_DOWN, &info); 6360 else 6361 addrconf_notify(NULL, NETDEV_UP, &info); 6362} 6363 6364static void addrconf_disable_change(struct net *net, __s32 newf) 6365{ 6366 struct net_device *dev; 6367 struct inet6_dev *idev; 6368 6369 for_each_netdev(net, dev) { 6370 idev = __in6_dev_get(dev); 6371 if (idev) { 6372 int changed = (!idev->cnf.disable_ipv6) ^ (!newf); 6373 6374 WRITE_ONCE(idev->cnf.disable_ipv6, newf); 6375 if (changed) 6376 dev_disable_change(idev); 6377 } 6378 } 6379} 6380 6381static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf) 6382{ 6383 struct net *net = (struct net *)table->extra2; 6384 int old; 6385 6386 if (p == &net->ipv6.devconf_dflt->disable_ipv6) { 6387 WRITE_ONCE(*p, newf); 6388 return 0; 6389 } 6390 6391 if (!rtnl_trylock()) 6392 return restart_syscall(); 6393 6394 old = *p; 6395 WRITE_ONCE(*p, newf); 6396 6397 if (p == &net->ipv6.devconf_all->disable_ipv6) { 6398 WRITE_ONCE(net->ipv6.devconf_dflt->disable_ipv6, newf); 6399 addrconf_disable_change(net, newf); 6400 } else if ((!newf) ^ (!old)) 6401 dev_disable_change((struct inet6_dev *)table->extra1); 6402 6403 rtnl_unlock(); 6404 return 0; 6405} 6406 6407static int addrconf_sysctl_disable(struct ctl_table *ctl, int write, 6408 void *buffer, size_t *lenp, loff_t *ppos) 6409{ 6410 int *valp = ctl->data; 6411 int val = *valp; 6412 loff_t pos = *ppos; 6413 struct ctl_table lctl; 6414 int ret; 6415 6416 /* 6417 * ctl->data points to idev->cnf.disable_ipv6, we should 6418 * not modify it until we get the rtnl lock. 6419 */ 6420 lctl = *ctl; 6421 lctl.data = &val; 6422 6423 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 6424 6425 if (write) 6426 ret = addrconf_disable_ipv6(ctl, valp, val); 6427 if (ret) 6428 *ppos = pos; 6429 return ret; 6430} 6431 6432static int addrconf_sysctl_proxy_ndp(struct ctl_table *ctl, int write, 6433 void *buffer, size_t *lenp, loff_t *ppos) 6434{ 6435 int *valp = ctl->data; 6436 int ret; 6437 int old, new; 6438 6439 old = *valp; 6440 ret = proc_dointvec(ctl, write, buffer, lenp, ppos); 6441 new = *valp; 6442 6443 if (write && old != new) { 6444 struct net *net = ctl->extra2; 6445 6446 if (!rtnl_trylock()) 6447 return restart_syscall(); 6448 6449 if (valp == &net->ipv6.devconf_dflt->proxy_ndp) 6450 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 6451 NETCONFA_PROXY_NEIGH, 6452 NETCONFA_IFINDEX_DEFAULT, 6453 net->ipv6.devconf_dflt); 6454 else if (valp == &net->ipv6.devconf_all->proxy_ndp) 6455 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 6456 NETCONFA_PROXY_NEIGH, 6457 NETCONFA_IFINDEX_ALL, 6458 net->ipv6.devconf_all); 6459 else { 6460 struct inet6_dev *idev = ctl->extra1; 6461 6462 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 6463 NETCONFA_PROXY_NEIGH, 6464 idev->dev->ifindex, 6465 &idev->cnf); 6466 } 6467 rtnl_unlock(); 6468 } 6469 6470 return ret; 6471} 6472 6473static int addrconf_sysctl_addr_gen_mode(struct ctl_table *ctl, int write, 6474 void *buffer, size_t *lenp, 6475 loff_t *ppos) 6476{ 6477 int ret = 0; 6478 u32 new_val; 6479 struct inet6_dev *idev = (struct inet6_dev *)ctl->extra1; 6480 struct net *net = (struct net *)ctl->extra2; 6481 struct ctl_table tmp = { 6482 .data = &new_val, 6483 .maxlen = sizeof(new_val), 6484 .mode = ctl->mode, 6485 }; 6486 6487 if (!rtnl_trylock()) 6488 return restart_syscall(); 6489 6490 new_val = *((u32 *)ctl->data); 6491 6492 ret = proc_douintvec(&tmp, write, buffer, lenp, ppos); 6493 if (ret != 0) 6494 goto out; 6495 6496 if (write) { 6497 if (check_addr_gen_mode(new_val) < 0) { 6498 ret = -EINVAL; 6499 goto out; 6500 } 6501 6502 if (idev) { 6503 if (check_stable_privacy(idev, net, new_val) < 0) { 6504 ret = -EINVAL; 6505 goto out; 6506 } 6507 6508 if (idev->cnf.addr_gen_mode != new_val) { 6509 WRITE_ONCE(idev->cnf.addr_gen_mode, new_val); 6510 addrconf_init_auto_addrs(idev->dev); 6511 } 6512 } else if (&net->ipv6.devconf_all->addr_gen_mode == ctl->data) { 6513 struct net_device *dev; 6514 6515 WRITE_ONCE(net->ipv6.devconf_dflt->addr_gen_mode, new_val); 6516 for_each_netdev(net, dev) { 6517 idev = __in6_dev_get(dev); 6518 if (idev && 6519 idev->cnf.addr_gen_mode != new_val) { 6520 WRITE_ONCE(idev->cnf.addr_gen_mode, 6521 new_val); 6522 addrconf_init_auto_addrs(idev->dev); 6523 } 6524 } 6525 } 6526 6527 WRITE_ONCE(*((u32 *)ctl->data), new_val); 6528 } 6529 6530out: 6531 rtnl_unlock(); 6532 6533 return ret; 6534} 6535 6536static int addrconf_sysctl_stable_secret(struct ctl_table *ctl, int write, 6537 void *buffer, size_t *lenp, 6538 loff_t *ppos) 6539{ 6540 int err; 6541 struct in6_addr addr; 6542 char str[IPV6_MAX_STRLEN]; 6543 struct ctl_table lctl = *ctl; 6544 struct net *net = ctl->extra2; 6545 struct ipv6_stable_secret *secret = ctl->data; 6546 6547 if (&net->ipv6.devconf_all->stable_secret == ctl->data) 6548 return -EIO; 6549 6550 lctl.maxlen = IPV6_MAX_STRLEN; 6551 lctl.data = str; 6552 6553 if (!rtnl_trylock()) 6554 return restart_syscall(); 6555 6556 if (!write && !secret->initialized) { 6557 err = -EIO; 6558 goto out; 6559 } 6560 6561 err = snprintf(str, sizeof(str), "%pI6", &secret->secret); 6562 if (err >= sizeof(str)) { 6563 err = -EIO; 6564 goto out; 6565 } 6566 6567 err = proc_dostring(&lctl, write, buffer, lenp, ppos); 6568 if (err || !write) 6569 goto out; 6570 6571 if (in6_pton(str, -1, addr.in6_u.u6_addr8, -1, NULL) != 1) { 6572 err = -EIO; 6573 goto out; 6574 } 6575 6576 secret->initialized = true; 6577 secret->secret = addr; 6578 6579 if (&net->ipv6.devconf_dflt->stable_secret == ctl->data) { 6580 struct net_device *dev; 6581 6582 for_each_netdev(net, dev) { 6583 struct inet6_dev *idev = __in6_dev_get(dev); 6584 6585 if (idev) { 6586 WRITE_ONCE(idev->cnf.addr_gen_mode, 6587 IN6_ADDR_GEN_MODE_STABLE_PRIVACY); 6588 } 6589 } 6590 } else { 6591 struct inet6_dev *idev = ctl->extra1; 6592 6593 WRITE_ONCE(idev->cnf.addr_gen_mode, 6594 IN6_ADDR_GEN_MODE_STABLE_PRIVACY); 6595 } 6596 6597out: 6598 rtnl_unlock(); 6599 6600 return err; 6601} 6602 6603static 6604int addrconf_sysctl_ignore_routes_with_linkdown(struct ctl_table *ctl, 6605 int write, void *buffer, 6606 size_t *lenp, 6607 loff_t *ppos) 6608{ 6609 int *valp = ctl->data; 6610 int val = *valp; 6611 loff_t pos = *ppos; 6612 struct ctl_table lctl; 6613 int ret; 6614 6615 /* ctl->data points to idev->cnf.ignore_routes_when_linkdown 6616 * we should not modify it until we get the rtnl lock. 6617 */ 6618 lctl = *ctl; 6619 lctl.data = &val; 6620 6621 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 6622 6623 if (write) 6624 ret = addrconf_fixup_linkdown(ctl, valp, val); 6625 if (ret) 6626 *ppos = pos; 6627 return ret; 6628} 6629 6630static 6631void addrconf_set_nopolicy(struct rt6_info *rt, int action) 6632{ 6633 if (rt) { 6634 if (action) 6635 rt->dst.flags |= DST_NOPOLICY; 6636 else 6637 rt->dst.flags &= ~DST_NOPOLICY; 6638 } 6639} 6640 6641static 6642void addrconf_disable_policy_idev(struct inet6_dev *idev, int val) 6643{ 6644 struct inet6_ifaddr *ifa; 6645 6646 read_lock_bh(&idev->lock); 6647 list_for_each_entry(ifa, &idev->addr_list, if_list) { 6648 spin_lock(&ifa->lock); 6649 if (ifa->rt) { 6650 /* host routes only use builtin fib6_nh */ 6651 struct fib6_nh *nh = ifa->rt->fib6_nh; 6652 int cpu; 6653 6654 rcu_read_lock(); 6655 ifa->rt->dst_nopolicy = val ? true : false; 6656 if (nh->rt6i_pcpu) { 6657 for_each_possible_cpu(cpu) { 6658 struct rt6_info **rtp; 6659 6660 rtp = per_cpu_ptr(nh->rt6i_pcpu, cpu); 6661 addrconf_set_nopolicy(*rtp, val); 6662 } 6663 } 6664 rcu_read_unlock(); 6665 } 6666 spin_unlock(&ifa->lock); 6667 } 6668 read_unlock_bh(&idev->lock); 6669} 6670 6671static 6672int addrconf_disable_policy(struct ctl_table *ctl, int *valp, int val) 6673{ 6674 struct net *net = (struct net *)ctl->extra2; 6675 struct inet6_dev *idev; 6676 6677 if (valp == &net->ipv6.devconf_dflt->disable_policy) { 6678 WRITE_ONCE(*valp, val); 6679 return 0; 6680 } 6681 6682 if (!rtnl_trylock()) 6683 return restart_syscall(); 6684 6685 WRITE_ONCE(*valp, val); 6686 6687 if (valp == &net->ipv6.devconf_all->disable_policy) { 6688 struct net_device *dev; 6689 6690 for_each_netdev(net, dev) { 6691 idev = __in6_dev_get(dev); 6692 if (idev) 6693 addrconf_disable_policy_idev(idev, val); 6694 } 6695 } else { 6696 idev = (struct inet6_dev *)ctl->extra1; 6697 addrconf_disable_policy_idev(idev, val); 6698 } 6699 6700 rtnl_unlock(); 6701 return 0; 6702} 6703 6704static int addrconf_sysctl_disable_policy(struct ctl_table *ctl, int write, 6705 void *buffer, size_t *lenp, loff_t *ppos) 6706{ 6707 int *valp = ctl->data; 6708 int val = *valp; 6709 loff_t pos = *ppos; 6710 struct ctl_table lctl; 6711 int ret; 6712 6713 lctl = *ctl; 6714 lctl.data = &val; 6715 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 6716 6717 if (write && (*valp != val)) 6718 ret = addrconf_disable_policy(ctl, valp, val); 6719 6720 if (ret) 6721 *ppos = pos; 6722 6723 return ret; 6724} 6725 6726static int minus_one = -1; 6727static const int two_five_five = 255; 6728static u32 ioam6_if_id_max = U16_MAX; 6729 6730static const struct ctl_table addrconf_sysctl[] = { 6731 { 6732 .procname = "forwarding", 6733 .data = &ipv6_devconf.forwarding, 6734 .maxlen = sizeof(int), 6735 .mode = 0644, 6736 .proc_handler = addrconf_sysctl_forward, 6737 }, 6738 { 6739 .procname = "hop_limit", 6740 .data = &ipv6_devconf.hop_limit, 6741 .maxlen = sizeof(int), 6742 .mode = 0644, 6743 .proc_handler = proc_dointvec_minmax, 6744 .extra1 = (void *)SYSCTL_ONE, 6745 .extra2 = (void *)&two_five_five, 6746 }, 6747 { 6748 .procname = "mtu", 6749 .data = &ipv6_devconf.mtu6, 6750 .maxlen = sizeof(int), 6751 .mode = 0644, 6752 .proc_handler = addrconf_sysctl_mtu, 6753 }, 6754 { 6755 .procname = "accept_ra", 6756 .data = &ipv6_devconf.accept_ra, 6757 .maxlen = sizeof(int), 6758 .mode = 0644, 6759 .proc_handler = proc_dointvec, 6760 }, 6761 { 6762 .procname = "accept_redirects", 6763 .data = &ipv6_devconf.accept_redirects, 6764 .maxlen = sizeof(int), 6765 .mode = 0644, 6766 .proc_handler = proc_dointvec, 6767 }, 6768 { 6769 .procname = "autoconf", 6770 .data = &ipv6_devconf.autoconf, 6771 .maxlen = sizeof(int), 6772 .mode = 0644, 6773 .proc_handler = proc_dointvec, 6774 }, 6775 { 6776 .procname = "dad_transmits", 6777 .data = &ipv6_devconf.dad_transmits, 6778 .maxlen = sizeof(int), 6779 .mode = 0644, 6780 .proc_handler = proc_dointvec, 6781 }, 6782 { 6783 .procname = "router_solicitations", 6784 .data = &ipv6_devconf.rtr_solicits, 6785 .maxlen = sizeof(int), 6786 .mode = 0644, 6787 .proc_handler = proc_dointvec_minmax, 6788 .extra1 = &minus_one, 6789 }, 6790 { 6791 .procname = "router_solicitation_interval", 6792 .data = &ipv6_devconf.rtr_solicit_interval, 6793 .maxlen = sizeof(int), 6794 .mode = 0644, 6795 .proc_handler = proc_dointvec_jiffies, 6796 }, 6797 { 6798 .procname = "router_solicitation_max_interval", 6799 .data = &ipv6_devconf.rtr_solicit_max_interval, 6800 .maxlen = sizeof(int), 6801 .mode = 0644, 6802 .proc_handler = proc_dointvec_jiffies, 6803 }, 6804 { 6805 .procname = "router_solicitation_delay", 6806 .data = &ipv6_devconf.rtr_solicit_delay, 6807 .maxlen = sizeof(int), 6808 .mode = 0644, 6809 .proc_handler = proc_dointvec_jiffies, 6810 }, 6811 { 6812 .procname = "force_mld_version", 6813 .data = &ipv6_devconf.force_mld_version, 6814 .maxlen = sizeof(int), 6815 .mode = 0644, 6816 .proc_handler = proc_dointvec, 6817 }, 6818 { 6819 .procname = "mldv1_unsolicited_report_interval", 6820 .data = 6821 &ipv6_devconf.mldv1_unsolicited_report_interval, 6822 .maxlen = sizeof(int), 6823 .mode = 0644, 6824 .proc_handler = proc_dointvec_ms_jiffies, 6825 }, 6826 { 6827 .procname = "mldv2_unsolicited_report_interval", 6828 .data = 6829 &ipv6_devconf.mldv2_unsolicited_report_interval, 6830 .maxlen = sizeof(int), 6831 .mode = 0644, 6832 .proc_handler = proc_dointvec_ms_jiffies, 6833 }, 6834 { 6835 .procname = "use_tempaddr", 6836 .data = &ipv6_devconf.use_tempaddr, 6837 .maxlen = sizeof(int), 6838 .mode = 0644, 6839 .proc_handler = proc_dointvec, 6840 }, 6841 { 6842 .procname = "temp_valid_lft", 6843 .data = &ipv6_devconf.temp_valid_lft, 6844 .maxlen = sizeof(int), 6845 .mode = 0644, 6846 .proc_handler = proc_dointvec, 6847 }, 6848 { 6849 .procname = "temp_prefered_lft", 6850 .data = &ipv6_devconf.temp_prefered_lft, 6851 .maxlen = sizeof(int), 6852 .mode = 0644, 6853 .proc_handler = proc_dointvec, 6854 }, 6855 { 6856 .procname = "regen_min_advance", 6857 .data = &ipv6_devconf.regen_min_advance, 6858 .maxlen = sizeof(int), 6859 .mode = 0644, 6860 .proc_handler = proc_dointvec, 6861 }, 6862 { 6863 .procname = "regen_max_retry", 6864 .data = &ipv6_devconf.regen_max_retry, 6865 .maxlen = sizeof(int), 6866 .mode = 0644, 6867 .proc_handler = proc_dointvec, 6868 }, 6869 { 6870 .procname = "max_desync_factor", 6871 .data = &ipv6_devconf.max_desync_factor, 6872 .maxlen = sizeof(int), 6873 .mode = 0644, 6874 .proc_handler = proc_dointvec, 6875 }, 6876 { 6877 .procname = "max_addresses", 6878 .data = &ipv6_devconf.max_addresses, 6879 .maxlen = sizeof(int), 6880 .mode = 0644, 6881 .proc_handler = proc_dointvec, 6882 }, 6883 { 6884 .procname = "accept_ra_defrtr", 6885 .data = &ipv6_devconf.accept_ra_defrtr, 6886 .maxlen = sizeof(int), 6887 .mode = 0644, 6888 .proc_handler = proc_dointvec, 6889 }, 6890 { 6891 .procname = "ra_defrtr_metric", 6892 .data = &ipv6_devconf.ra_defrtr_metric, 6893 .maxlen = sizeof(u32), 6894 .mode = 0644, 6895 .proc_handler = proc_douintvec_minmax, 6896 .extra1 = (void *)SYSCTL_ONE, 6897 }, 6898 { 6899 .procname = "accept_ra_min_hop_limit", 6900 .data = &ipv6_devconf.accept_ra_min_hop_limit, 6901 .maxlen = sizeof(int), 6902 .mode = 0644, 6903 .proc_handler = proc_dointvec, 6904 }, 6905 { 6906 .procname = "accept_ra_min_lft", 6907 .data = &ipv6_devconf.accept_ra_min_lft, 6908 .maxlen = sizeof(int), 6909 .mode = 0644, 6910 .proc_handler = proc_dointvec, 6911 }, 6912 { 6913 .procname = "accept_ra_pinfo", 6914 .data = &ipv6_devconf.accept_ra_pinfo, 6915 .maxlen = sizeof(int), 6916 .mode = 0644, 6917 .proc_handler = proc_dointvec, 6918 }, 6919 { 6920 .procname = "ra_honor_pio_life", 6921 .data = &ipv6_devconf.ra_honor_pio_life, 6922 .maxlen = sizeof(u8), 6923 .mode = 0644, 6924 .proc_handler = proc_dou8vec_minmax, 6925 .extra1 = SYSCTL_ZERO, 6926 .extra2 = SYSCTL_ONE, 6927 }, 6928#ifdef CONFIG_IPV6_ROUTER_PREF 6929 { 6930 .procname = "accept_ra_rtr_pref", 6931 .data = &ipv6_devconf.accept_ra_rtr_pref, 6932 .maxlen = sizeof(int), 6933 .mode = 0644, 6934 .proc_handler = proc_dointvec, 6935 }, 6936 { 6937 .procname = "router_probe_interval", 6938 .data = &ipv6_devconf.rtr_probe_interval, 6939 .maxlen = sizeof(int), 6940 .mode = 0644, 6941 .proc_handler = proc_dointvec_jiffies, 6942 }, 6943#ifdef CONFIG_IPV6_ROUTE_INFO 6944 { 6945 .procname = "accept_ra_rt_info_min_plen", 6946 .data = &ipv6_devconf.accept_ra_rt_info_min_plen, 6947 .maxlen = sizeof(int), 6948 .mode = 0644, 6949 .proc_handler = proc_dointvec, 6950 }, 6951 { 6952 .procname = "accept_ra_rt_info_max_plen", 6953 .data = &ipv6_devconf.accept_ra_rt_info_max_plen, 6954 .maxlen = sizeof(int), 6955 .mode = 0644, 6956 .proc_handler = proc_dointvec, 6957 }, 6958#endif 6959#endif 6960 { 6961 .procname = "proxy_ndp", 6962 .data = &ipv6_devconf.proxy_ndp, 6963 .maxlen = sizeof(int), 6964 .mode = 0644, 6965 .proc_handler = addrconf_sysctl_proxy_ndp, 6966 }, 6967 { 6968 .procname = "accept_source_route", 6969 .data = &ipv6_devconf.accept_source_route, 6970 .maxlen = sizeof(int), 6971 .mode = 0644, 6972 .proc_handler = proc_dointvec, 6973 }, 6974#ifdef CONFIG_IPV6_OPTIMISTIC_DAD 6975 { 6976 .procname = "optimistic_dad", 6977 .data = &ipv6_devconf.optimistic_dad, 6978 .maxlen = sizeof(int), 6979 .mode = 0644, 6980 .proc_handler = proc_dointvec, 6981 }, 6982 { 6983 .procname = "use_optimistic", 6984 .data = &ipv6_devconf.use_optimistic, 6985 .maxlen = sizeof(int), 6986 .mode = 0644, 6987 .proc_handler = proc_dointvec, 6988 }, 6989#endif 6990#ifdef CONFIG_IPV6_MROUTE 6991 { 6992 .procname = "mc_forwarding", 6993 .data = &ipv6_devconf.mc_forwarding, 6994 .maxlen = sizeof(int), 6995 .mode = 0444, 6996 .proc_handler = proc_dointvec, 6997 }, 6998#endif 6999 { 7000 .procname = "disable_ipv6", 7001 .data = &ipv6_devconf.disable_ipv6, 7002 .maxlen = sizeof(int), 7003 .mode = 0644, 7004 .proc_handler = addrconf_sysctl_disable, 7005 }, 7006 { 7007 .procname = "accept_dad", 7008 .data = &ipv6_devconf.accept_dad, 7009 .maxlen = sizeof(int), 7010 .mode = 0644, 7011 .proc_handler = proc_dointvec, 7012 }, 7013 { 7014 .procname = "force_tllao", 7015 .data = &ipv6_devconf.force_tllao, 7016 .maxlen = sizeof(int), 7017 .mode = 0644, 7018 .proc_handler = proc_dointvec 7019 }, 7020 { 7021 .procname = "ndisc_notify", 7022 .data = &ipv6_devconf.ndisc_notify, 7023 .maxlen = sizeof(int), 7024 .mode = 0644, 7025 .proc_handler = proc_dointvec 7026 }, 7027 { 7028 .procname = "suppress_frag_ndisc", 7029 .data = &ipv6_devconf.suppress_frag_ndisc, 7030 .maxlen = sizeof(int), 7031 .mode = 0644, 7032 .proc_handler = proc_dointvec 7033 }, 7034 { 7035 .procname = "accept_ra_from_local", 7036 .data = &ipv6_devconf.accept_ra_from_local, 7037 .maxlen = sizeof(int), 7038 .mode = 0644, 7039 .proc_handler = proc_dointvec, 7040 }, 7041 { 7042 .procname = "accept_ra_mtu", 7043 .data = &ipv6_devconf.accept_ra_mtu, 7044 .maxlen = sizeof(int), 7045 .mode = 0644, 7046 .proc_handler = proc_dointvec, 7047 }, 7048 { 7049 .procname = "stable_secret", 7050 .data = &ipv6_devconf.stable_secret, 7051 .maxlen = IPV6_MAX_STRLEN, 7052 .mode = 0600, 7053 .proc_handler = addrconf_sysctl_stable_secret, 7054 }, 7055 { 7056 .procname = "use_oif_addrs_only", 7057 .data = &ipv6_devconf.use_oif_addrs_only, 7058 .maxlen = sizeof(int), 7059 .mode = 0644, 7060 .proc_handler = proc_dointvec, 7061 }, 7062 { 7063 .procname = "ignore_routes_with_linkdown", 7064 .data = &ipv6_devconf.ignore_routes_with_linkdown, 7065 .maxlen = sizeof(int), 7066 .mode = 0644, 7067 .proc_handler = addrconf_sysctl_ignore_routes_with_linkdown, 7068 }, 7069 { 7070 .procname = "drop_unicast_in_l2_multicast", 7071 .data = &ipv6_devconf.drop_unicast_in_l2_multicast, 7072 .maxlen = sizeof(int), 7073 .mode = 0644, 7074 .proc_handler = proc_dointvec, 7075 }, 7076 { 7077 .procname = "drop_unsolicited_na", 7078 .data = &ipv6_devconf.drop_unsolicited_na, 7079 .maxlen = sizeof(int), 7080 .mode = 0644, 7081 .proc_handler = proc_dointvec, 7082 }, 7083 { 7084 .procname = "keep_addr_on_down", 7085 .data = &ipv6_devconf.keep_addr_on_down, 7086 .maxlen = sizeof(int), 7087 .mode = 0644, 7088 .proc_handler = proc_dointvec, 7089 7090 }, 7091 { 7092 .procname = "seg6_enabled", 7093 .data = &ipv6_devconf.seg6_enabled, 7094 .maxlen = sizeof(int), 7095 .mode = 0644, 7096 .proc_handler = proc_dointvec, 7097 }, 7098#ifdef CONFIG_IPV6_SEG6_HMAC 7099 { 7100 .procname = "seg6_require_hmac", 7101 .data = &ipv6_devconf.seg6_require_hmac, 7102 .maxlen = sizeof(int), 7103 .mode = 0644, 7104 .proc_handler = proc_dointvec, 7105 }, 7106#endif 7107 { 7108 .procname = "enhanced_dad", 7109 .data = &ipv6_devconf.enhanced_dad, 7110 .maxlen = sizeof(int), 7111 .mode = 0644, 7112 .proc_handler = proc_dointvec, 7113 }, 7114 { 7115 .procname = "addr_gen_mode", 7116 .data = &ipv6_devconf.addr_gen_mode, 7117 .maxlen = sizeof(int), 7118 .mode = 0644, 7119 .proc_handler = addrconf_sysctl_addr_gen_mode, 7120 }, 7121 { 7122 .procname = "disable_policy", 7123 .data = &ipv6_devconf.disable_policy, 7124 .maxlen = sizeof(int), 7125 .mode = 0644, 7126 .proc_handler = addrconf_sysctl_disable_policy, 7127 }, 7128 { 7129 .procname = "ndisc_tclass", 7130 .data = &ipv6_devconf.ndisc_tclass, 7131 .maxlen = sizeof(int), 7132 .mode = 0644, 7133 .proc_handler = proc_dointvec_minmax, 7134 .extra1 = (void *)SYSCTL_ZERO, 7135 .extra2 = (void *)&two_five_five, 7136 }, 7137 { 7138 .procname = "rpl_seg_enabled", 7139 .data = &ipv6_devconf.rpl_seg_enabled, 7140 .maxlen = sizeof(int), 7141 .mode = 0644, 7142 .proc_handler = proc_dointvec, 7143 }, 7144 { 7145 .procname = "ioam6_enabled", 7146 .data = &ipv6_devconf.ioam6_enabled, 7147 .maxlen = sizeof(u8), 7148 .mode = 0644, 7149 .proc_handler = proc_dou8vec_minmax, 7150 .extra1 = (void *)SYSCTL_ZERO, 7151 .extra2 = (void *)SYSCTL_ONE, 7152 }, 7153 { 7154 .procname = "ioam6_id", 7155 .data = &ipv6_devconf.ioam6_id, 7156 .maxlen = sizeof(u32), 7157 .mode = 0644, 7158 .proc_handler = proc_douintvec_minmax, 7159 .extra1 = (void *)SYSCTL_ZERO, 7160 .extra2 = (void *)&ioam6_if_id_max, 7161 }, 7162 { 7163 .procname = "ioam6_id_wide", 7164 .data = &ipv6_devconf.ioam6_id_wide, 7165 .maxlen = sizeof(u32), 7166 .mode = 0644, 7167 .proc_handler = proc_douintvec, 7168 }, 7169 { 7170 .procname = "ndisc_evict_nocarrier", 7171 .data = &ipv6_devconf.ndisc_evict_nocarrier, 7172 .maxlen = sizeof(u8), 7173 .mode = 0644, 7174 .proc_handler = proc_dou8vec_minmax, 7175 .extra1 = (void *)SYSCTL_ZERO, 7176 .extra2 = (void *)SYSCTL_ONE, 7177 }, 7178 { 7179 .procname = "accept_untracked_na", 7180 .data = &ipv6_devconf.accept_untracked_na, 7181 .maxlen = sizeof(int), 7182 .mode = 0644, 7183 .proc_handler = proc_dointvec_minmax, 7184 .extra1 = SYSCTL_ZERO, 7185 .extra2 = SYSCTL_TWO, 7186 }, 7187}; 7188 7189static int __addrconf_sysctl_register(struct net *net, char *dev_name, 7190 struct inet6_dev *idev, struct ipv6_devconf *p) 7191{ 7192 size_t table_size = ARRAY_SIZE(addrconf_sysctl); 7193 int i, ifindex; 7194 struct ctl_table *table; 7195 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ]; 7196 7197 table = kmemdup(addrconf_sysctl, sizeof(addrconf_sysctl), GFP_KERNEL_ACCOUNT); 7198 if (!table) 7199 goto out; 7200 7201 for (i = 0; i < table_size; i++) { 7202 table[i].data += (char *)p - (char *)&ipv6_devconf; 7203 /* If one of these is already set, then it is not safe to 7204 * overwrite either of them: this makes proc_dointvec_minmax 7205 * usable. 7206 */ 7207 if (!table[i].extra1 && !table[i].extra2) { 7208 table[i].extra1 = idev; /* embedded; no ref */ 7209 table[i].extra2 = net; 7210 } 7211 } 7212 7213 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name); 7214 7215 p->sysctl_header = register_net_sysctl_sz(net, path, table, 7216 table_size); 7217 if (!p->sysctl_header) 7218 goto free; 7219 7220 if (!strcmp(dev_name, "all")) 7221 ifindex = NETCONFA_IFINDEX_ALL; 7222 else if (!strcmp(dev_name, "default")) 7223 ifindex = NETCONFA_IFINDEX_DEFAULT; 7224 else 7225 ifindex = idev->dev->ifindex; 7226 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, NETCONFA_ALL, 7227 ifindex, p); 7228 return 0; 7229 7230free: 7231 kfree(table); 7232out: 7233 return -ENOBUFS; 7234} 7235 7236static void __addrconf_sysctl_unregister(struct net *net, 7237 struct ipv6_devconf *p, int ifindex) 7238{ 7239 const struct ctl_table *table; 7240 7241 if (!p->sysctl_header) 7242 return; 7243 7244 table = p->sysctl_header->ctl_table_arg; 7245 unregister_net_sysctl_table(p->sysctl_header); 7246 p->sysctl_header = NULL; 7247 kfree(table); 7248 7249 inet6_netconf_notify_devconf(net, RTM_DELNETCONF, 0, ifindex, NULL); 7250} 7251 7252static int addrconf_sysctl_register(struct inet6_dev *idev) 7253{ 7254 int err; 7255 7256 if (!sysctl_dev_name_is_allowed(idev->dev->name)) 7257 return -EINVAL; 7258 7259 err = neigh_sysctl_register(idev->dev, idev->nd_parms, 7260 &ndisc_ifinfo_sysctl_change); 7261 if (err) 7262 return err; 7263 err = __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name, 7264 idev, &idev->cnf); 7265 if (err) 7266 neigh_sysctl_unregister(idev->nd_parms); 7267 7268 return err; 7269} 7270 7271static void addrconf_sysctl_unregister(struct inet6_dev *idev) 7272{ 7273 __addrconf_sysctl_unregister(dev_net(idev->dev), &idev->cnf, 7274 idev->dev->ifindex); 7275 neigh_sysctl_unregister(idev->nd_parms); 7276} 7277 7278 7279#endif 7280 7281static int __net_init addrconf_init_net(struct net *net) 7282{ 7283 int err = -ENOMEM; 7284 struct ipv6_devconf *all, *dflt; 7285 7286 spin_lock_init(&net->ipv6.addrconf_hash_lock); 7287 INIT_DEFERRABLE_WORK(&net->ipv6.addr_chk_work, addrconf_verify_work); 7288 net->ipv6.inet6_addr_lst = kcalloc(IN6_ADDR_HSIZE, 7289 sizeof(struct hlist_head), 7290 GFP_KERNEL); 7291 if (!net->ipv6.inet6_addr_lst) 7292 goto err_alloc_addr; 7293 7294 all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL); 7295 if (!all) 7296 goto err_alloc_all; 7297 7298 dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL); 7299 if (!dflt) 7300 goto err_alloc_dflt; 7301 7302 if (!net_eq(net, &init_net)) { 7303 switch (net_inherit_devconf()) { 7304 case 1: /* copy from init_net */ 7305 memcpy(all, init_net.ipv6.devconf_all, 7306 sizeof(ipv6_devconf)); 7307 memcpy(dflt, init_net.ipv6.devconf_dflt, 7308 sizeof(ipv6_devconf_dflt)); 7309 break; 7310 case 3: /* copy from the current netns */ 7311 memcpy(all, current->nsproxy->net_ns->ipv6.devconf_all, 7312 sizeof(ipv6_devconf)); 7313 memcpy(dflt, 7314 current->nsproxy->net_ns->ipv6.devconf_dflt, 7315 sizeof(ipv6_devconf_dflt)); 7316 break; 7317 case 0: 7318 case 2: 7319 /* use compiled values */ 7320 break; 7321 } 7322 } 7323 7324 /* these will be inherited by all namespaces */ 7325 dflt->autoconf = ipv6_defaults.autoconf; 7326 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6; 7327 7328 dflt->stable_secret.initialized = false; 7329 all->stable_secret.initialized = false; 7330 7331 net->ipv6.devconf_all = all; 7332 net->ipv6.devconf_dflt = dflt; 7333 7334#ifdef CONFIG_SYSCTL 7335 err = __addrconf_sysctl_register(net, "all", NULL, all); 7336 if (err < 0) 7337 goto err_reg_all; 7338 7339 err = __addrconf_sysctl_register(net, "default", NULL, dflt); 7340 if (err < 0) 7341 goto err_reg_dflt; 7342#endif 7343 return 0; 7344 7345#ifdef CONFIG_SYSCTL 7346err_reg_dflt: 7347 __addrconf_sysctl_unregister(net, all, NETCONFA_IFINDEX_ALL); 7348err_reg_all: 7349 kfree(dflt); 7350 net->ipv6.devconf_dflt = NULL; 7351#endif 7352err_alloc_dflt: 7353 kfree(all); 7354 net->ipv6.devconf_all = NULL; 7355err_alloc_all: 7356 kfree(net->ipv6.inet6_addr_lst); 7357err_alloc_addr: 7358 return err; 7359} 7360 7361static void __net_exit addrconf_exit_net(struct net *net) 7362{ 7363 int i; 7364 7365#ifdef CONFIG_SYSCTL 7366 __addrconf_sysctl_unregister(net, net->ipv6.devconf_dflt, 7367 NETCONFA_IFINDEX_DEFAULT); 7368 __addrconf_sysctl_unregister(net, net->ipv6.devconf_all, 7369 NETCONFA_IFINDEX_ALL); 7370#endif 7371 kfree(net->ipv6.devconf_dflt); 7372 net->ipv6.devconf_dflt = NULL; 7373 kfree(net->ipv6.devconf_all); 7374 net->ipv6.devconf_all = NULL; 7375 7376 cancel_delayed_work_sync(&net->ipv6.addr_chk_work); 7377 /* 7378 * Check hash table, then free it. 7379 */ 7380 for (i = 0; i < IN6_ADDR_HSIZE; i++) 7381 WARN_ON_ONCE(!hlist_empty(&net->ipv6.inet6_addr_lst[i])); 7382 7383 kfree(net->ipv6.inet6_addr_lst); 7384 net->ipv6.inet6_addr_lst = NULL; 7385} 7386 7387static struct pernet_operations addrconf_ops = { 7388 .init = addrconf_init_net, 7389 .exit = addrconf_exit_net, 7390}; 7391 7392static struct rtnl_af_ops inet6_ops __read_mostly = { 7393 .family = AF_INET6, 7394 .fill_link_af = inet6_fill_link_af, 7395 .get_link_af_size = inet6_get_link_af_size, 7396 .validate_link_af = inet6_validate_link_af, 7397 .set_link_af = inet6_set_link_af, 7398}; 7399 7400/* 7401 * Init / cleanup code 7402 */ 7403 7404int __init addrconf_init(void) 7405{ 7406 struct inet6_dev *idev; 7407 int err; 7408 7409 err = ipv6_addr_label_init(); 7410 if (err < 0) { 7411 pr_crit("%s: cannot initialize default policy table: %d\n", 7412 __func__, err); 7413 goto out; 7414 } 7415 7416 err = register_pernet_subsys(&addrconf_ops); 7417 if (err < 0) 7418 goto out_addrlabel; 7419 7420 /* All works using addrconf_wq need to lock rtnl. */ 7421 addrconf_wq = create_singlethread_workqueue("ipv6_addrconf"); 7422 if (!addrconf_wq) { 7423 err = -ENOMEM; 7424 goto out_nowq; 7425 } 7426 7427 rtnl_lock(); 7428 idev = ipv6_add_dev(blackhole_netdev); 7429 rtnl_unlock(); 7430 if (IS_ERR(idev)) { 7431 err = PTR_ERR(idev); 7432 goto errlo; 7433 } 7434 7435 ip6_route_init_special_entries(); 7436 7437 register_netdevice_notifier(&ipv6_dev_notf); 7438 7439 addrconf_verify(&init_net); 7440 7441 rtnl_af_register(&inet6_ops); 7442 7443 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETLINK, 7444 NULL, inet6_dump_ifinfo, RTNL_FLAG_DUMP_UNLOCKED); 7445 if (err < 0) 7446 goto errout; 7447 7448 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_NEWADDR, 7449 inet6_rtm_newaddr, NULL, 0); 7450 if (err < 0) 7451 goto errout; 7452 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_DELADDR, 7453 inet6_rtm_deladdr, NULL, 0); 7454 if (err < 0) 7455 goto errout; 7456 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETADDR, 7457 inet6_rtm_getaddr, inet6_dump_ifaddr, 7458 RTNL_FLAG_DOIT_UNLOCKED | 7459 RTNL_FLAG_DUMP_UNLOCKED); 7460 if (err < 0) 7461 goto errout; 7462 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETMULTICAST, 7463 NULL, inet6_dump_ifmcaddr, 7464 RTNL_FLAG_DUMP_UNLOCKED); 7465 if (err < 0) 7466 goto errout; 7467 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETANYCAST, 7468 NULL, inet6_dump_ifacaddr, 7469 RTNL_FLAG_DUMP_UNLOCKED); 7470 if (err < 0) 7471 goto errout; 7472 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETNETCONF, 7473 inet6_netconf_get_devconf, 7474 inet6_netconf_dump_devconf, 7475 RTNL_FLAG_DOIT_UNLOCKED | 7476 RTNL_FLAG_DUMP_UNLOCKED); 7477 if (err < 0) 7478 goto errout; 7479 err = ipv6_addr_label_rtnl_register(); 7480 if (err < 0) 7481 goto errout; 7482 7483 return 0; 7484errout: 7485 rtnl_unregister_all(PF_INET6); 7486 rtnl_af_unregister(&inet6_ops); 7487 unregister_netdevice_notifier(&ipv6_dev_notf); 7488errlo: 7489 destroy_workqueue(addrconf_wq); 7490out_nowq: 7491 unregister_pernet_subsys(&addrconf_ops); 7492out_addrlabel: 7493 ipv6_addr_label_cleanup(); 7494out: 7495 return err; 7496} 7497 7498void addrconf_cleanup(void) 7499{ 7500 struct net_device *dev; 7501 7502 unregister_netdevice_notifier(&ipv6_dev_notf); 7503 unregister_pernet_subsys(&addrconf_ops); 7504 ipv6_addr_label_cleanup(); 7505 7506 rtnl_af_unregister(&inet6_ops); 7507 7508 rtnl_lock(); 7509 7510 /* clean dev list */ 7511 for_each_netdev(&init_net, dev) { 7512 if (__in6_dev_get(dev) == NULL) 7513 continue; 7514 addrconf_ifdown(dev, true); 7515 } 7516 addrconf_ifdown(init_net.loopback_dev, true); 7517 7518 rtnl_unlock(); 7519 7520 destroy_workqueue(addrconf_wq); 7521} 7522