1// SPDX-License-Identifier: GPL-2.0-or-later 2/* 3 * IPv6 Address [auto]configuration 4 * Linux INET6 implementation 5 * 6 * Authors: 7 * Pedro Roque <roque@di.fc.ul.pt> 8 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru> 9 */ 10 11/* 12 * Changes: 13 * 14 * Janos Farkas : delete timer on ifdown 15 * <chexum@bankinf.banki.hu> 16 * Andi Kleen : kill double kfree on module 17 * unload. 18 * Maciej W. Rozycki : FDDI support 19 * sekiya@USAGI : Don't send too many RS 20 * packets. 21 * yoshfuji@USAGI : Fixed interval between DAD 22 * packets. 23 * YOSHIFUJI Hideaki @USAGI : improved accuracy of 24 * address validation timer. 25 * YOSHIFUJI Hideaki @USAGI : Privacy Extensions (RFC3041) 26 * support. 27 * Yuji SEKIYA @USAGI : Don't assign a same IPv6 28 * address on a same interface. 29 * YOSHIFUJI Hideaki @USAGI : ARCnet support 30 * YOSHIFUJI Hideaki @USAGI : convert /proc/net/if_inet6 to 31 * seq_file. 32 * YOSHIFUJI Hideaki @USAGI : improved source address 33 * selection; consider scope, 34 * status etc. 35 */ 36 37#define pr_fmt(fmt) "IPv6: " fmt 38 39#include <linux/errno.h> 40#include <linux/types.h> 41#include <linux/kernel.h> 42#include <linux/sched/signal.h> 43#include <linux/socket.h> 44#include <linux/sockios.h> 45#include <linux/net.h> 46#include <linux/inet.h> 47#include <linux/in6.h> 48#include <linux/netdevice.h> 49#include <linux/if_addr.h> 50#include <linux/if_arp.h> 51#include <linux/if_arcnet.h> 52#include <linux/if_infiniband.h> 53#include <linux/route.h> 54#include <linux/inetdevice.h> 55#include <linux/init.h> 56#include <linux/slab.h> 57#ifdef CONFIG_SYSCTL 58#include <linux/sysctl.h> 59#endif 60#include <linux/capability.h> 61#include <linux/delay.h> 62#include <linux/notifier.h> 63#include <linux/string.h> 64#include <linux/hash.h> 65 66#include <net/net_namespace.h> 67#include <net/sock.h> 68#include <net/snmp.h> 69 70#include <net/6lowpan.h> 71#include <net/firewire.h> 72#include <net/ipv6.h> 73#include <net/protocol.h> 74#include <net/ndisc.h> 75#include <net/ip6_route.h> 76#include <net/addrconf.h> 77#include <net/tcp.h> 78#include <net/ip.h> 79#include <net/netlink.h> 80#include <net/pkt_sched.h> 81#include <net/l3mdev.h> 82#include <linux/if_tunnel.h> 83#include <linux/rtnetlink.h> 84#include <linux/netconf.h> 85#include <linux/random.h> 86#include <linux/uaccess.h> 87#include <asm/unaligned.h> 88 89#include <linux/proc_fs.h> 90#include <linux/seq_file.h> 91#include <linux/export.h> 92#include <linux/ioam6.h> 93 94#define INFINITY_LIFE_TIME 0xFFFFFFFF 95 96#define IPV6_MAX_STRLEN \ 97 sizeof("ffff:ffff:ffff:ffff:ffff:ffff:255.255.255.255") 98 99static inline u32 cstamp_delta(unsigned long cstamp) 100{ 101 return (cstamp - INITIAL_JIFFIES) * 100UL / HZ; 102} 103 104static inline s32 rfc3315_s14_backoff_init(s32 irt) 105{ 106 /* multiply 'initial retransmission time' by 0.9 .. 1.1 */ 107 u64 tmp = get_random_u32_inclusive(900000, 1100000) * (u64)irt; 108 do_div(tmp, 1000000); 109 return (s32)tmp; 110} 111 112static inline s32 rfc3315_s14_backoff_update(s32 rt, s32 mrt) 113{ 114 /* multiply 'retransmission timeout' by 1.9 .. 2.1 */ 115 u64 tmp = get_random_u32_inclusive(1900000, 2100000) * (u64)rt; 116 do_div(tmp, 1000000); 117 if ((s32)tmp > mrt) { 118 /* multiply 'maximum retransmission time' by 0.9 .. 1.1 */ 119 tmp = get_random_u32_inclusive(900000, 1100000) * (u64)mrt; 120 do_div(tmp, 1000000); 121 } 122 return (s32)tmp; 123} 124 125#ifdef CONFIG_SYSCTL 126static int addrconf_sysctl_register(struct inet6_dev *idev); 127static void addrconf_sysctl_unregister(struct inet6_dev *idev); 128#else 129static inline int addrconf_sysctl_register(struct inet6_dev *idev) 130{ 131 return 0; 132} 133 134static inline void addrconf_sysctl_unregister(struct inet6_dev *idev) 135{ 136} 137#endif 138 139static void ipv6_gen_rnd_iid(struct in6_addr *addr); 140 141static int ipv6_generate_eui64(u8 *eui, struct net_device *dev); 142static int ipv6_count_addresses(const struct inet6_dev *idev); 143static int ipv6_generate_stable_address(struct in6_addr *addr, 144 u8 dad_count, 145 const struct inet6_dev *idev); 146 147#define IN6_ADDR_HSIZE_SHIFT 8 148#define IN6_ADDR_HSIZE (1 << IN6_ADDR_HSIZE_SHIFT) 149 150static void addrconf_verify(struct net *net); 151static void addrconf_verify_rtnl(struct net *net); 152 153static struct workqueue_struct *addrconf_wq; 154 155static void addrconf_join_anycast(struct inet6_ifaddr *ifp); 156static void addrconf_leave_anycast(struct inet6_ifaddr *ifp); 157 158static void addrconf_type_change(struct net_device *dev, 159 unsigned long event); 160static int addrconf_ifdown(struct net_device *dev, bool unregister); 161 162static struct fib6_info *addrconf_get_prefix_route(const struct in6_addr *pfx, 163 int plen, 164 const struct net_device *dev, 165 u32 flags, u32 noflags, 166 bool no_gw); 167 168static void addrconf_dad_start(struct inet6_ifaddr *ifp); 169static void addrconf_dad_work(struct work_struct *w); 170static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id, 171 bool send_na); 172static void addrconf_dad_run(struct inet6_dev *idev, bool restart); 173static void addrconf_rs_timer(struct timer_list *t); 174static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa); 175static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa); 176 177static void inet6_prefix_notify(int event, struct inet6_dev *idev, 178 struct prefix_info *pinfo); 179 180static struct ipv6_devconf ipv6_devconf __read_mostly = { 181 .forwarding = 0, 182 .hop_limit = IPV6_DEFAULT_HOPLIMIT, 183 .mtu6 = IPV6_MIN_MTU, 184 .accept_ra = 1, 185 .accept_redirects = 1, 186 .autoconf = 1, 187 .force_mld_version = 0, 188 .mldv1_unsolicited_report_interval = 10 * HZ, 189 .mldv2_unsolicited_report_interval = HZ, 190 .dad_transmits = 1, 191 .rtr_solicits = MAX_RTR_SOLICITATIONS, 192 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL, 193 .rtr_solicit_max_interval = RTR_SOLICITATION_MAX_INTERVAL, 194 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY, 195 .use_tempaddr = 0, 196 .temp_valid_lft = TEMP_VALID_LIFETIME, 197 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME, 198 .regen_min_advance = REGEN_MIN_ADVANCE, 199 .regen_max_retry = REGEN_MAX_RETRY, 200 .max_desync_factor = MAX_DESYNC_FACTOR, 201 .max_addresses = IPV6_MAX_ADDRESSES, 202 .accept_ra_defrtr = 1, 203 .ra_defrtr_metric = IP6_RT_PRIO_USER, 204 .accept_ra_from_local = 0, 205 .accept_ra_min_hop_limit= 1, 206 .accept_ra_min_lft = 0, 207 .accept_ra_pinfo = 1, 208#ifdef CONFIG_IPV6_ROUTER_PREF 209 .accept_ra_rtr_pref = 1, 210 .rtr_probe_interval = 60 * HZ, 211#ifdef CONFIG_IPV6_ROUTE_INFO 212 .accept_ra_rt_info_min_plen = 0, 213 .accept_ra_rt_info_max_plen = 0, 214#endif 215#endif 216 .proxy_ndp = 0, 217 .accept_source_route = 0, /* we do not accept RH0 by default. */ 218 .disable_ipv6 = 0, 219 .accept_dad = 0, 220 .suppress_frag_ndisc = 1, 221 .accept_ra_mtu = 1, 222 .stable_secret = { 223 .initialized = false, 224 }, 225 .use_oif_addrs_only = 0, 226 .ignore_routes_with_linkdown = 0, 227 .keep_addr_on_down = 0, 228 .seg6_enabled = 0, 229#ifdef CONFIG_IPV6_SEG6_HMAC 230 .seg6_require_hmac = 0, 231#endif 232 .enhanced_dad = 1, 233 .addr_gen_mode = IN6_ADDR_GEN_MODE_EUI64, 234 .disable_policy = 0, 235 .rpl_seg_enabled = 0, 236 .ioam6_enabled = 0, 237 .ioam6_id = IOAM6_DEFAULT_IF_ID, 238 .ioam6_id_wide = IOAM6_DEFAULT_IF_ID_WIDE, 239 .ndisc_evict_nocarrier = 1, 240 .ra_honor_pio_life = 0, 241}; 242 243static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = { 244 .forwarding = 0, 245 .hop_limit = IPV6_DEFAULT_HOPLIMIT, 246 .mtu6 = IPV6_MIN_MTU, 247 .accept_ra = 1, 248 .accept_redirects = 1, 249 .autoconf = 1, 250 .force_mld_version = 0, 251 .mldv1_unsolicited_report_interval = 10 * HZ, 252 .mldv2_unsolicited_report_interval = HZ, 253 .dad_transmits = 1, 254 .rtr_solicits = MAX_RTR_SOLICITATIONS, 255 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL, 256 .rtr_solicit_max_interval = RTR_SOLICITATION_MAX_INTERVAL, 257 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY, 258 .use_tempaddr = 0, 259 .temp_valid_lft = TEMP_VALID_LIFETIME, 260 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME, 261 .regen_min_advance = REGEN_MIN_ADVANCE, 262 .regen_max_retry = REGEN_MAX_RETRY, 263 .max_desync_factor = MAX_DESYNC_FACTOR, 264 .max_addresses = IPV6_MAX_ADDRESSES, 265 .accept_ra_defrtr = 1, 266 .ra_defrtr_metric = IP6_RT_PRIO_USER, 267 .accept_ra_from_local = 0, 268 .accept_ra_min_hop_limit= 1, 269 .accept_ra_min_lft = 0, 270 .accept_ra_pinfo = 1, 271#ifdef CONFIG_IPV6_ROUTER_PREF 272 .accept_ra_rtr_pref = 1, 273 .rtr_probe_interval = 60 * HZ, 274#ifdef CONFIG_IPV6_ROUTE_INFO 275 .accept_ra_rt_info_min_plen = 0, 276 .accept_ra_rt_info_max_plen = 0, 277#endif 278#endif 279 .proxy_ndp = 0, 280 .accept_source_route = 0, /* we do not accept RH0 by default. */ 281 .disable_ipv6 = 0, 282 .accept_dad = 1, 283 .suppress_frag_ndisc = 1, 284 .accept_ra_mtu = 1, 285 .stable_secret = { 286 .initialized = false, 287 }, 288 .use_oif_addrs_only = 0, 289 .ignore_routes_with_linkdown = 0, 290 .keep_addr_on_down = 0, 291 .seg6_enabled = 0, 292#ifdef CONFIG_IPV6_SEG6_HMAC 293 .seg6_require_hmac = 0, 294#endif 295 .enhanced_dad = 1, 296 .addr_gen_mode = IN6_ADDR_GEN_MODE_EUI64, 297 .disable_policy = 0, 298 .rpl_seg_enabled = 0, 299 .ioam6_enabled = 0, 300 .ioam6_id = IOAM6_DEFAULT_IF_ID, 301 .ioam6_id_wide = IOAM6_DEFAULT_IF_ID_WIDE, 302 .ndisc_evict_nocarrier = 1, 303 .ra_honor_pio_life = 0, 304}; 305 306/* Check if link is ready: is it up and is a valid qdisc available */ 307static inline bool addrconf_link_ready(const struct net_device *dev) 308{ 309 return netif_oper_up(dev) && !qdisc_tx_is_noop(dev); 310} 311 312static void addrconf_del_rs_timer(struct inet6_dev *idev) 313{ 314 if (del_timer(&idev->rs_timer)) 315 __in6_dev_put(idev); 316} 317 318static void addrconf_del_dad_work(struct inet6_ifaddr *ifp) 319{ 320 if (cancel_delayed_work(&ifp->dad_work)) 321 __in6_ifa_put(ifp); 322} 323 324static void addrconf_mod_rs_timer(struct inet6_dev *idev, 325 unsigned long when) 326{ 327 if (!mod_timer(&idev->rs_timer, jiffies + when)) 328 in6_dev_hold(idev); 329} 330 331static void addrconf_mod_dad_work(struct inet6_ifaddr *ifp, 332 unsigned long delay) 333{ 334 in6_ifa_hold(ifp); 335 if (mod_delayed_work(addrconf_wq, &ifp->dad_work, delay)) 336 in6_ifa_put(ifp); 337} 338 339static int snmp6_alloc_dev(struct inet6_dev *idev) 340{ 341 int i; 342 343 idev->stats.ipv6 = alloc_percpu_gfp(struct ipstats_mib, GFP_KERNEL_ACCOUNT); 344 if (!idev->stats.ipv6) 345 goto err_ip; 346 347 for_each_possible_cpu(i) { 348 struct ipstats_mib *addrconf_stats; 349 addrconf_stats = per_cpu_ptr(idev->stats.ipv6, i); 350 u64_stats_init(&addrconf_stats->syncp); 351 } 352 353 354 idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device), 355 GFP_KERNEL); 356 if (!idev->stats.icmpv6dev) 357 goto err_icmp; 358 idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device), 359 GFP_KERNEL_ACCOUNT); 360 if (!idev->stats.icmpv6msgdev) 361 goto err_icmpmsg; 362 363 return 0; 364 365err_icmpmsg: 366 kfree(idev->stats.icmpv6dev); 367err_icmp: 368 free_percpu(idev->stats.ipv6); 369err_ip: 370 return -ENOMEM; 371} 372 373static struct inet6_dev *ipv6_add_dev(struct net_device *dev) 374{ 375 struct inet6_dev *ndev; 376 int err = -ENOMEM; 377 378 ASSERT_RTNL(); 379 380 if (dev->mtu < IPV6_MIN_MTU && dev != blackhole_netdev) 381 return ERR_PTR(-EINVAL); 382 383 ndev = kzalloc(sizeof(*ndev), GFP_KERNEL_ACCOUNT); 384 if (!ndev) 385 return ERR_PTR(err); 386 387 rwlock_init(&ndev->lock); 388 ndev->dev = dev; 389 INIT_LIST_HEAD(&ndev->addr_list); 390 timer_setup(&ndev->rs_timer, addrconf_rs_timer, 0); 391 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf)); 392 393 if (ndev->cnf.stable_secret.initialized) 394 ndev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY; 395 396 ndev->cnf.mtu6 = dev->mtu; 397 ndev->ra_mtu = 0; 398 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl); 399 if (!ndev->nd_parms) { 400 kfree(ndev); 401 return ERR_PTR(err); 402 } 403 if (ndev->cnf.forwarding) 404 dev_disable_lro(dev); 405 /* We refer to the device */ 406 netdev_hold(dev, &ndev->dev_tracker, GFP_KERNEL); 407 408 if (snmp6_alloc_dev(ndev) < 0) { 409 netdev_dbg(dev, "%s: cannot allocate memory for statistics\n", 410 __func__); 411 neigh_parms_release(&nd_tbl, ndev->nd_parms); 412 netdev_put(dev, &ndev->dev_tracker); 413 kfree(ndev); 414 return ERR_PTR(err); 415 } 416 417 if (dev != blackhole_netdev) { 418 if (snmp6_register_dev(ndev) < 0) { 419 netdev_dbg(dev, "%s: cannot create /proc/net/dev_snmp6/%s\n", 420 __func__, dev->name); 421 goto err_release; 422 } 423 } 424 /* One reference from device. */ 425 refcount_set(&ndev->refcnt, 1); 426 427 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK)) 428 ndev->cnf.accept_dad = -1; 429 430#if IS_ENABLED(CONFIG_IPV6_SIT) 431 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) { 432 pr_info("%s: Disabled Multicast RS\n", dev->name); 433 ndev->cnf.rtr_solicits = 0; 434 } 435#endif 436 437 INIT_LIST_HEAD(&ndev->tempaddr_list); 438 ndev->desync_factor = U32_MAX; 439 if ((dev->flags&IFF_LOOPBACK) || 440 dev->type == ARPHRD_TUNNEL || 441 dev->type == ARPHRD_TUNNEL6 || 442 dev->type == ARPHRD_SIT || 443 dev->type == ARPHRD_NONE) { 444 ndev->cnf.use_tempaddr = -1; 445 } 446 447 ndev->token = in6addr_any; 448 449 if (netif_running(dev) && addrconf_link_ready(dev)) 450 ndev->if_flags |= IF_READY; 451 452 ipv6_mc_init_dev(ndev); 453 ndev->tstamp = jiffies; 454 if (dev != blackhole_netdev) { 455 err = addrconf_sysctl_register(ndev); 456 if (err) { 457 ipv6_mc_destroy_dev(ndev); 458 snmp6_unregister_dev(ndev); 459 goto err_release; 460 } 461 } 462 /* protected by rtnl_lock */ 463 rcu_assign_pointer(dev->ip6_ptr, ndev); 464 465 if (dev != blackhole_netdev) { 466 /* Join interface-local all-node multicast group */ 467 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allnodes); 468 469 /* Join all-node multicast group */ 470 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes); 471 472 /* Join all-router multicast group if forwarding is set */ 473 if (ndev->cnf.forwarding && (dev->flags & IFF_MULTICAST)) 474 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters); 475 } 476 return ndev; 477 478err_release: 479 neigh_parms_release(&nd_tbl, ndev->nd_parms); 480 ndev->dead = 1; 481 in6_dev_finish_destroy(ndev); 482 return ERR_PTR(err); 483} 484 485static struct inet6_dev *ipv6_find_idev(struct net_device *dev) 486{ 487 struct inet6_dev *idev; 488 489 ASSERT_RTNL(); 490 491 idev = __in6_dev_get(dev); 492 if (!idev) { 493 idev = ipv6_add_dev(dev); 494 if (IS_ERR(idev)) 495 return idev; 496 } 497 498 if (dev->flags&IFF_UP) 499 ipv6_mc_up(idev); 500 return idev; 501} 502 503static int inet6_netconf_msgsize_devconf(int type) 504{ 505 int size = NLMSG_ALIGN(sizeof(struct netconfmsg)) 506 + nla_total_size(4); /* NETCONFA_IFINDEX */ 507 bool all = false; 508 509 if (type == NETCONFA_ALL) 510 all = true; 511 512 if (all || type == NETCONFA_FORWARDING) 513 size += nla_total_size(4); 514#ifdef CONFIG_IPV6_MROUTE 515 if (all || type == NETCONFA_MC_FORWARDING) 516 size += nla_total_size(4); 517#endif 518 if (all || type == NETCONFA_PROXY_NEIGH) 519 size += nla_total_size(4); 520 521 if (all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN) 522 size += nla_total_size(4); 523 524 return size; 525} 526 527static int inet6_netconf_fill_devconf(struct sk_buff *skb, int ifindex, 528 struct ipv6_devconf *devconf, u32 portid, 529 u32 seq, int event, unsigned int flags, 530 int type) 531{ 532 struct nlmsghdr *nlh; 533 struct netconfmsg *ncm; 534 bool all = false; 535 536 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg), 537 flags); 538 if (!nlh) 539 return -EMSGSIZE; 540 541 if (type == NETCONFA_ALL) 542 all = true; 543 544 ncm = nlmsg_data(nlh); 545 ncm->ncm_family = AF_INET6; 546 547 if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0) 548 goto nla_put_failure; 549 550 if (!devconf) 551 goto out; 552 553 if ((all || type == NETCONFA_FORWARDING) && 554 nla_put_s32(skb, NETCONFA_FORWARDING, 555 READ_ONCE(devconf->forwarding)) < 0) 556 goto nla_put_failure; 557#ifdef CONFIG_IPV6_MROUTE 558 if ((all || type == NETCONFA_MC_FORWARDING) && 559 nla_put_s32(skb, NETCONFA_MC_FORWARDING, 560 atomic_read(&devconf->mc_forwarding)) < 0) 561 goto nla_put_failure; 562#endif 563 if ((all || type == NETCONFA_PROXY_NEIGH) && 564 nla_put_s32(skb, NETCONFA_PROXY_NEIGH, 565 READ_ONCE(devconf->proxy_ndp)) < 0) 566 goto nla_put_failure; 567 568 if ((all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN) && 569 nla_put_s32(skb, NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN, 570 READ_ONCE(devconf->ignore_routes_with_linkdown)) < 0) 571 goto nla_put_failure; 572 573out: 574 nlmsg_end(skb, nlh); 575 return 0; 576 577nla_put_failure: 578 nlmsg_cancel(skb, nlh); 579 return -EMSGSIZE; 580} 581 582void inet6_netconf_notify_devconf(struct net *net, int event, int type, 583 int ifindex, struct ipv6_devconf *devconf) 584{ 585 struct sk_buff *skb; 586 int err = -ENOBUFS; 587 588 skb = nlmsg_new(inet6_netconf_msgsize_devconf(type), GFP_KERNEL); 589 if (!skb) 590 goto errout; 591 592 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 0, 0, 593 event, 0, type); 594 if (err < 0) { 595 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */ 596 WARN_ON(err == -EMSGSIZE); 597 kfree_skb(skb); 598 goto errout; 599 } 600 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_NETCONF, NULL, GFP_KERNEL); 601 return; 602errout: 603 rtnl_set_sk_err(net, RTNLGRP_IPV6_NETCONF, err); 604} 605 606static const struct nla_policy devconf_ipv6_policy[NETCONFA_MAX+1] = { 607 [NETCONFA_IFINDEX] = { .len = sizeof(int) }, 608 [NETCONFA_FORWARDING] = { .len = sizeof(int) }, 609 [NETCONFA_PROXY_NEIGH] = { .len = sizeof(int) }, 610 [NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN] = { .len = sizeof(int) }, 611}; 612 613static int inet6_netconf_valid_get_req(struct sk_buff *skb, 614 const struct nlmsghdr *nlh, 615 struct nlattr **tb, 616 struct netlink_ext_ack *extack) 617{ 618 int i, err; 619 620 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(struct netconfmsg))) { 621 NL_SET_ERR_MSG_MOD(extack, "Invalid header for netconf get request"); 622 return -EINVAL; 623 } 624 625 if (!netlink_strict_get_check(skb)) 626 return nlmsg_parse_deprecated(nlh, sizeof(struct netconfmsg), 627 tb, NETCONFA_MAX, 628 devconf_ipv6_policy, extack); 629 630 err = nlmsg_parse_deprecated_strict(nlh, sizeof(struct netconfmsg), 631 tb, NETCONFA_MAX, 632 devconf_ipv6_policy, extack); 633 if (err) 634 return err; 635 636 for (i = 0; i <= NETCONFA_MAX; i++) { 637 if (!tb[i]) 638 continue; 639 640 switch (i) { 641 case NETCONFA_IFINDEX: 642 break; 643 default: 644 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in netconf get request"); 645 return -EINVAL; 646 } 647 } 648 649 return 0; 650} 651 652static int inet6_netconf_get_devconf(struct sk_buff *in_skb, 653 struct nlmsghdr *nlh, 654 struct netlink_ext_ack *extack) 655{ 656 struct net *net = sock_net(in_skb->sk); 657 struct nlattr *tb[NETCONFA_MAX+1]; 658 struct inet6_dev *in6_dev = NULL; 659 struct net_device *dev = NULL; 660 struct sk_buff *skb; 661 struct ipv6_devconf *devconf; 662 int ifindex; 663 int err; 664 665 err = inet6_netconf_valid_get_req(in_skb, nlh, tb, extack); 666 if (err < 0) 667 return err; 668 669 if (!tb[NETCONFA_IFINDEX]) 670 return -EINVAL; 671 672 err = -EINVAL; 673 ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]); 674 switch (ifindex) { 675 case NETCONFA_IFINDEX_ALL: 676 devconf = net->ipv6.devconf_all; 677 break; 678 case NETCONFA_IFINDEX_DEFAULT: 679 devconf = net->ipv6.devconf_dflt; 680 break; 681 default: 682 dev = dev_get_by_index(net, ifindex); 683 if (!dev) 684 return -EINVAL; 685 in6_dev = in6_dev_get(dev); 686 if (!in6_dev) 687 goto errout; 688 devconf = &in6_dev->cnf; 689 break; 690 } 691 692 err = -ENOBUFS; 693 skb = nlmsg_new(inet6_netconf_msgsize_devconf(NETCONFA_ALL), GFP_KERNEL); 694 if (!skb) 695 goto errout; 696 697 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 698 NETLINK_CB(in_skb).portid, 699 nlh->nlmsg_seq, RTM_NEWNETCONF, 0, 700 NETCONFA_ALL); 701 if (err < 0) { 702 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */ 703 WARN_ON(err == -EMSGSIZE); 704 kfree_skb(skb); 705 goto errout; 706 } 707 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid); 708errout: 709 if (in6_dev) 710 in6_dev_put(in6_dev); 711 dev_put(dev); 712 return err; 713} 714 715/* Combine dev_addr_genid and dev_base_seq to detect changes. 716 */ 717static u32 inet6_base_seq(const struct net *net) 718{ 719 u32 res = atomic_read(&net->ipv6.dev_addr_genid) + 720 READ_ONCE(net->dev_base_seq); 721 722 /* Must not return 0 (see nl_dump_check_consistent()). 723 * Chose a value far away from 0. 724 */ 725 if (!res) 726 res = 0x80000000; 727 return res; 728} 729 730static int inet6_netconf_dump_devconf(struct sk_buff *skb, 731 struct netlink_callback *cb) 732{ 733 const struct nlmsghdr *nlh = cb->nlh; 734 struct net *net = sock_net(skb->sk); 735 struct { 736 unsigned long ifindex; 737 unsigned int all_default; 738 } *ctx = (void *)cb->ctx; 739 struct net_device *dev; 740 struct inet6_dev *idev; 741 int err = 0; 742 743 if (cb->strict_check) { 744 struct netlink_ext_ack *extack = cb->extack; 745 struct netconfmsg *ncm; 746 747 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ncm))) { 748 NL_SET_ERR_MSG_MOD(extack, "Invalid header for netconf dump request"); 749 return -EINVAL; 750 } 751 752 if (nlmsg_attrlen(nlh, sizeof(*ncm))) { 753 NL_SET_ERR_MSG_MOD(extack, "Invalid data after header in netconf dump request"); 754 return -EINVAL; 755 } 756 } 757 758 rcu_read_lock(); 759 for_each_netdev_dump(net, dev, ctx->ifindex) { 760 idev = __in6_dev_get(dev); 761 if (!idev) 762 continue; 763 err = inet6_netconf_fill_devconf(skb, dev->ifindex, 764 &idev->cnf, 765 NETLINK_CB(cb->skb).portid, 766 nlh->nlmsg_seq, 767 RTM_NEWNETCONF, 768 NLM_F_MULTI, 769 NETCONFA_ALL); 770 if (err < 0) 771 goto done; 772 } 773 if (ctx->all_default == 0) { 774 err = inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL, 775 net->ipv6.devconf_all, 776 NETLINK_CB(cb->skb).portid, 777 nlh->nlmsg_seq, 778 RTM_NEWNETCONF, NLM_F_MULTI, 779 NETCONFA_ALL); 780 if (err < 0) 781 goto done; 782 ctx->all_default++; 783 } 784 if (ctx->all_default == 1) { 785 err = inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT, 786 net->ipv6.devconf_dflt, 787 NETLINK_CB(cb->skb).portid, 788 nlh->nlmsg_seq, 789 RTM_NEWNETCONF, NLM_F_MULTI, 790 NETCONFA_ALL); 791 if (err < 0) 792 goto done; 793 ctx->all_default++; 794 } 795done: 796 rcu_read_unlock(); 797 return err; 798} 799 800#ifdef CONFIG_SYSCTL 801static void dev_forward_change(struct inet6_dev *idev) 802{ 803 struct net_device *dev; 804 struct inet6_ifaddr *ifa; 805 LIST_HEAD(tmp_addr_list); 806 807 if (!idev) 808 return; 809 dev = idev->dev; 810 if (idev->cnf.forwarding) 811 dev_disable_lro(dev); 812 if (dev->flags & IFF_MULTICAST) { 813 if (idev->cnf.forwarding) { 814 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters); 815 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allrouters); 816 ipv6_dev_mc_inc(dev, &in6addr_sitelocal_allrouters); 817 } else { 818 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters); 819 ipv6_dev_mc_dec(dev, &in6addr_interfacelocal_allrouters); 820 ipv6_dev_mc_dec(dev, &in6addr_sitelocal_allrouters); 821 } 822 } 823 824 read_lock_bh(&idev->lock); 825 list_for_each_entry(ifa, &idev->addr_list, if_list) { 826 if (ifa->flags&IFA_F_TENTATIVE) 827 continue; 828 list_add_tail(&ifa->if_list_aux, &tmp_addr_list); 829 } 830 read_unlock_bh(&idev->lock); 831 832 while (!list_empty(&tmp_addr_list)) { 833 ifa = list_first_entry(&tmp_addr_list, 834 struct inet6_ifaddr, if_list_aux); 835 list_del(&ifa->if_list_aux); 836 if (idev->cnf.forwarding) 837 addrconf_join_anycast(ifa); 838 else 839 addrconf_leave_anycast(ifa); 840 } 841 842 inet6_netconf_notify_devconf(dev_net(dev), RTM_NEWNETCONF, 843 NETCONFA_FORWARDING, 844 dev->ifindex, &idev->cnf); 845} 846 847 848static void addrconf_forward_change(struct net *net, __s32 newf) 849{ 850 struct net_device *dev; 851 struct inet6_dev *idev; 852 853 for_each_netdev(net, dev) { 854 idev = __in6_dev_get(dev); 855 if (idev) { 856 int changed = (!idev->cnf.forwarding) ^ (!newf); 857 858 WRITE_ONCE(idev->cnf.forwarding, newf); 859 if (changed) 860 dev_forward_change(idev); 861 } 862 } 863} 864 865static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf) 866{ 867 struct net *net; 868 int old; 869 870 if (!rtnl_trylock()) 871 return restart_syscall(); 872 873 net = (struct net *)table->extra2; 874 old = *p; 875 WRITE_ONCE(*p, newf); 876 877 if (p == &net->ipv6.devconf_dflt->forwarding) { 878 if ((!newf) ^ (!old)) 879 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 880 NETCONFA_FORWARDING, 881 NETCONFA_IFINDEX_DEFAULT, 882 net->ipv6.devconf_dflt); 883 rtnl_unlock(); 884 return 0; 885 } 886 887 if (p == &net->ipv6.devconf_all->forwarding) { 888 int old_dflt = net->ipv6.devconf_dflt->forwarding; 889 890 WRITE_ONCE(net->ipv6.devconf_dflt->forwarding, newf); 891 if ((!newf) ^ (!old_dflt)) 892 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 893 NETCONFA_FORWARDING, 894 NETCONFA_IFINDEX_DEFAULT, 895 net->ipv6.devconf_dflt); 896 897 addrconf_forward_change(net, newf); 898 if ((!newf) ^ (!old)) 899 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 900 NETCONFA_FORWARDING, 901 NETCONFA_IFINDEX_ALL, 902 net->ipv6.devconf_all); 903 } else if ((!newf) ^ (!old)) 904 dev_forward_change((struct inet6_dev *)table->extra1); 905 rtnl_unlock(); 906 907 if (newf) 908 rt6_purge_dflt_routers(net); 909 return 1; 910} 911 912static void addrconf_linkdown_change(struct net *net, __s32 newf) 913{ 914 struct net_device *dev; 915 struct inet6_dev *idev; 916 917 for_each_netdev(net, dev) { 918 idev = __in6_dev_get(dev); 919 if (idev) { 920 int changed = (!idev->cnf.ignore_routes_with_linkdown) ^ (!newf); 921 922 WRITE_ONCE(idev->cnf.ignore_routes_with_linkdown, newf); 923 if (changed) 924 inet6_netconf_notify_devconf(dev_net(dev), 925 RTM_NEWNETCONF, 926 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN, 927 dev->ifindex, 928 &idev->cnf); 929 } 930 } 931} 932 933static int addrconf_fixup_linkdown(struct ctl_table *table, int *p, int newf) 934{ 935 struct net *net; 936 int old; 937 938 if (!rtnl_trylock()) 939 return restart_syscall(); 940 941 net = (struct net *)table->extra2; 942 old = *p; 943 WRITE_ONCE(*p, newf); 944 945 if (p == &net->ipv6.devconf_dflt->ignore_routes_with_linkdown) { 946 if ((!newf) ^ (!old)) 947 inet6_netconf_notify_devconf(net, 948 RTM_NEWNETCONF, 949 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN, 950 NETCONFA_IFINDEX_DEFAULT, 951 net->ipv6.devconf_dflt); 952 rtnl_unlock(); 953 return 0; 954 } 955 956 if (p == &net->ipv6.devconf_all->ignore_routes_with_linkdown) { 957 WRITE_ONCE(net->ipv6.devconf_dflt->ignore_routes_with_linkdown, newf); 958 addrconf_linkdown_change(net, newf); 959 if ((!newf) ^ (!old)) 960 inet6_netconf_notify_devconf(net, 961 RTM_NEWNETCONF, 962 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN, 963 NETCONFA_IFINDEX_ALL, 964 net->ipv6.devconf_all); 965 } 966 rtnl_unlock(); 967 968 return 1; 969} 970 971#endif 972 973/* Nobody refers to this ifaddr, destroy it */ 974void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp) 975{ 976 WARN_ON(!hlist_unhashed(&ifp->addr_lst)); 977 978#ifdef NET_REFCNT_DEBUG 979 pr_debug("%s\n", __func__); 980#endif 981 982 in6_dev_put(ifp->idev); 983 984 if (cancel_delayed_work(&ifp->dad_work)) 985 pr_notice("delayed DAD work was pending while freeing ifa=%p\n", 986 ifp); 987 988 if (ifp->state != INET6_IFADDR_STATE_DEAD) { 989 pr_warn("Freeing alive inet6 address %p\n", ifp); 990 return; 991 } 992 993 kfree_rcu(ifp, rcu); 994} 995 996static void 997ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp) 998{ 999 struct list_head *p; 1000 int ifp_scope = ipv6_addr_src_scope(&ifp->addr); 1001 1002 /* 1003 * Each device address list is sorted in order of scope - 1004 * global before linklocal. 1005 */ 1006 list_for_each(p, &idev->addr_list) { 1007 struct inet6_ifaddr *ifa 1008 = list_entry(p, struct inet6_ifaddr, if_list); 1009 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr)) 1010 break; 1011 } 1012 1013 list_add_tail_rcu(&ifp->if_list, p); 1014} 1015 1016static u32 inet6_addr_hash(const struct net *net, const struct in6_addr *addr) 1017{ 1018 u32 val = ipv6_addr_hash(addr) ^ net_hash_mix(net); 1019 1020 return hash_32(val, IN6_ADDR_HSIZE_SHIFT); 1021} 1022 1023static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr, 1024 struct net_device *dev, unsigned int hash) 1025{ 1026 struct inet6_ifaddr *ifp; 1027 1028 hlist_for_each_entry(ifp, &net->ipv6.inet6_addr_lst[hash], addr_lst) { 1029 if (ipv6_addr_equal(&ifp->addr, addr)) { 1030 if (!dev || ifp->idev->dev == dev) 1031 return true; 1032 } 1033 } 1034 return false; 1035} 1036 1037static int ipv6_add_addr_hash(struct net_device *dev, struct inet6_ifaddr *ifa) 1038{ 1039 struct net *net = dev_net(dev); 1040 unsigned int hash = inet6_addr_hash(net, &ifa->addr); 1041 int err = 0; 1042 1043 spin_lock_bh(&net->ipv6.addrconf_hash_lock); 1044 1045 /* Ignore adding duplicate addresses on an interface */ 1046 if (ipv6_chk_same_addr(net, &ifa->addr, dev, hash)) { 1047 netdev_dbg(dev, "ipv6_add_addr: already assigned\n"); 1048 err = -EEXIST; 1049 } else { 1050 hlist_add_head_rcu(&ifa->addr_lst, &net->ipv6.inet6_addr_lst[hash]); 1051 } 1052 1053 spin_unlock_bh(&net->ipv6.addrconf_hash_lock); 1054 1055 return err; 1056} 1057 1058/* On success it returns ifp with increased reference count */ 1059 1060static struct inet6_ifaddr * 1061ipv6_add_addr(struct inet6_dev *idev, struct ifa6_config *cfg, 1062 bool can_block, struct netlink_ext_ack *extack) 1063{ 1064 gfp_t gfp_flags = can_block ? GFP_KERNEL : GFP_ATOMIC; 1065 int addr_type = ipv6_addr_type(cfg->pfx); 1066 struct net *net = dev_net(idev->dev); 1067 struct inet6_ifaddr *ifa = NULL; 1068 struct fib6_info *f6i = NULL; 1069 int err = 0; 1070 1071 if (addr_type == IPV6_ADDR_ANY) { 1072 NL_SET_ERR_MSG_MOD(extack, "Invalid address"); 1073 return ERR_PTR(-EADDRNOTAVAIL); 1074 } else if (addr_type & IPV6_ADDR_MULTICAST && 1075 !(cfg->ifa_flags & IFA_F_MCAUTOJOIN)) { 1076 NL_SET_ERR_MSG_MOD(extack, "Cannot assign multicast address without \"IFA_F_MCAUTOJOIN\" flag"); 1077 return ERR_PTR(-EADDRNOTAVAIL); 1078 } else if (!(idev->dev->flags & IFF_LOOPBACK) && 1079 !netif_is_l3_master(idev->dev) && 1080 addr_type & IPV6_ADDR_LOOPBACK) { 1081 NL_SET_ERR_MSG_MOD(extack, "Cannot assign loopback address on this device"); 1082 return ERR_PTR(-EADDRNOTAVAIL); 1083 } 1084 1085 if (idev->dead) { 1086 NL_SET_ERR_MSG_MOD(extack, "device is going away"); 1087 err = -ENODEV; 1088 goto out; 1089 } 1090 1091 if (idev->cnf.disable_ipv6) { 1092 NL_SET_ERR_MSG_MOD(extack, "IPv6 is disabled on this device"); 1093 err = -EACCES; 1094 goto out; 1095 } 1096 1097 /* validator notifier needs to be blocking; 1098 * do not call in atomic context 1099 */ 1100 if (can_block) { 1101 struct in6_validator_info i6vi = { 1102 .i6vi_addr = *cfg->pfx, 1103 .i6vi_dev = idev, 1104 .extack = extack, 1105 }; 1106 1107 err = inet6addr_validator_notifier_call_chain(NETDEV_UP, &i6vi); 1108 err = notifier_to_errno(err); 1109 if (err < 0) 1110 goto out; 1111 } 1112 1113 ifa = kzalloc(sizeof(*ifa), gfp_flags | __GFP_ACCOUNT); 1114 if (!ifa) { 1115 err = -ENOBUFS; 1116 goto out; 1117 } 1118 1119 f6i = addrconf_f6i_alloc(net, idev, cfg->pfx, false, gfp_flags, extack); 1120 if (IS_ERR(f6i)) { 1121 err = PTR_ERR(f6i); 1122 f6i = NULL; 1123 goto out; 1124 } 1125 1126 neigh_parms_data_state_setall(idev->nd_parms); 1127 1128 ifa->addr = *cfg->pfx; 1129 if (cfg->peer_pfx) 1130 ifa->peer_addr = *cfg->peer_pfx; 1131 1132 spin_lock_init(&ifa->lock); 1133 INIT_DELAYED_WORK(&ifa->dad_work, addrconf_dad_work); 1134 INIT_HLIST_NODE(&ifa->addr_lst); 1135 ifa->scope = cfg->scope; 1136 ifa->prefix_len = cfg->plen; 1137 ifa->rt_priority = cfg->rt_priority; 1138 ifa->flags = cfg->ifa_flags; 1139 ifa->ifa_proto = cfg->ifa_proto; 1140 /* No need to add the TENTATIVE flag for addresses with NODAD */ 1141 if (!(cfg->ifa_flags & IFA_F_NODAD)) 1142 ifa->flags |= IFA_F_TENTATIVE; 1143 ifa->valid_lft = cfg->valid_lft; 1144 ifa->prefered_lft = cfg->preferred_lft; 1145 ifa->cstamp = ifa->tstamp = jiffies; 1146 ifa->tokenized = false; 1147 1148 ifa->rt = f6i; 1149 1150 ifa->idev = idev; 1151 in6_dev_hold(idev); 1152 1153 /* For caller */ 1154 refcount_set(&ifa->refcnt, 1); 1155 1156 rcu_read_lock(); 1157 1158 err = ipv6_add_addr_hash(idev->dev, ifa); 1159 if (err < 0) { 1160 rcu_read_unlock(); 1161 goto out; 1162 } 1163 1164 write_lock_bh(&idev->lock); 1165 1166 /* Add to inet6_dev unicast addr list. */ 1167 ipv6_link_dev_addr(idev, ifa); 1168 1169 if (ifa->flags&IFA_F_TEMPORARY) { 1170 list_add(&ifa->tmp_list, &idev->tempaddr_list); 1171 in6_ifa_hold(ifa); 1172 } 1173 1174 in6_ifa_hold(ifa); 1175 write_unlock_bh(&idev->lock); 1176 1177 rcu_read_unlock(); 1178 1179 inet6addr_notifier_call_chain(NETDEV_UP, ifa); 1180out: 1181 if (unlikely(err < 0)) { 1182 fib6_info_release(f6i); 1183 1184 if (ifa) { 1185 if (ifa->idev) 1186 in6_dev_put(ifa->idev); 1187 kfree(ifa); 1188 } 1189 ifa = ERR_PTR(err); 1190 } 1191 1192 return ifa; 1193} 1194 1195enum cleanup_prefix_rt_t { 1196 CLEANUP_PREFIX_RT_NOP, /* no cleanup action for prefix route */ 1197 CLEANUP_PREFIX_RT_DEL, /* delete the prefix route */ 1198 CLEANUP_PREFIX_RT_EXPIRE, /* update the lifetime of the prefix route */ 1199}; 1200 1201/* 1202 * Check, whether the prefix for ifp would still need a prefix route 1203 * after deleting ifp. The function returns one of the CLEANUP_PREFIX_RT_* 1204 * constants. 1205 * 1206 * 1) we don't purge prefix if address was not permanent. 1207 * prefix is managed by its own lifetime. 1208 * 2) we also don't purge, if the address was IFA_F_NOPREFIXROUTE. 1209 * 3) if there are no addresses, delete prefix. 1210 * 4) if there are still other permanent address(es), 1211 * corresponding prefix is still permanent. 1212 * 5) if there are still other addresses with IFA_F_NOPREFIXROUTE, 1213 * don't purge the prefix, assume user space is managing it. 1214 * 6) otherwise, update prefix lifetime to the 1215 * longest valid lifetime among the corresponding 1216 * addresses on the device. 1217 * Note: subsequent RA will update lifetime. 1218 **/ 1219static enum cleanup_prefix_rt_t 1220check_cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long *expires) 1221{ 1222 struct inet6_ifaddr *ifa; 1223 struct inet6_dev *idev = ifp->idev; 1224 unsigned long lifetime; 1225 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_DEL; 1226 1227 *expires = jiffies; 1228 1229 list_for_each_entry(ifa, &idev->addr_list, if_list) { 1230 if (ifa == ifp) 1231 continue; 1232 if (ifa->prefix_len != ifp->prefix_len || 1233 !ipv6_prefix_equal(&ifa->addr, &ifp->addr, 1234 ifp->prefix_len)) 1235 continue; 1236 if (ifa->flags & (IFA_F_PERMANENT | IFA_F_NOPREFIXROUTE)) 1237 return CLEANUP_PREFIX_RT_NOP; 1238 1239 action = CLEANUP_PREFIX_RT_EXPIRE; 1240 1241 spin_lock(&ifa->lock); 1242 1243 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ); 1244 /* 1245 * Note: Because this address is 1246 * not permanent, lifetime < 1247 * LONG_MAX / HZ here. 1248 */ 1249 if (time_before(*expires, ifa->tstamp + lifetime * HZ)) 1250 *expires = ifa->tstamp + lifetime * HZ; 1251 spin_unlock(&ifa->lock); 1252 } 1253 1254 return action; 1255} 1256 1257static void 1258cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long expires, 1259 bool del_rt, bool del_peer) 1260{ 1261 struct fib6_table *table; 1262 struct fib6_info *f6i; 1263 1264 f6i = addrconf_get_prefix_route(del_peer ? &ifp->peer_addr : &ifp->addr, 1265 ifp->prefix_len, 1266 ifp->idev->dev, 0, RTF_DEFAULT, true); 1267 if (f6i) { 1268 if (del_rt) 1269 ip6_del_rt(dev_net(ifp->idev->dev), f6i, false); 1270 else { 1271 if (!(f6i->fib6_flags & RTF_EXPIRES)) { 1272 table = f6i->fib6_table; 1273 spin_lock_bh(&table->tb6_lock); 1274 1275 fib6_set_expires(f6i, expires); 1276 fib6_add_gc_list(f6i); 1277 1278 spin_unlock_bh(&table->tb6_lock); 1279 } 1280 fib6_info_release(f6i); 1281 } 1282 } 1283} 1284 1285 1286/* This function wants to get referenced ifp and releases it before return */ 1287 1288static void ipv6_del_addr(struct inet6_ifaddr *ifp) 1289{ 1290 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_NOP; 1291 struct net *net = dev_net(ifp->idev->dev); 1292 unsigned long expires; 1293 int state; 1294 1295 ASSERT_RTNL(); 1296 1297 spin_lock_bh(&ifp->lock); 1298 state = ifp->state; 1299 ifp->state = INET6_IFADDR_STATE_DEAD; 1300 spin_unlock_bh(&ifp->lock); 1301 1302 if (state == INET6_IFADDR_STATE_DEAD) 1303 goto out; 1304 1305 spin_lock_bh(&net->ipv6.addrconf_hash_lock); 1306 hlist_del_init_rcu(&ifp->addr_lst); 1307 spin_unlock_bh(&net->ipv6.addrconf_hash_lock); 1308 1309 write_lock_bh(&ifp->idev->lock); 1310 1311 if (ifp->flags&IFA_F_TEMPORARY) { 1312 list_del(&ifp->tmp_list); 1313 if (ifp->ifpub) { 1314 in6_ifa_put(ifp->ifpub); 1315 ifp->ifpub = NULL; 1316 } 1317 __in6_ifa_put(ifp); 1318 } 1319 1320 if (ifp->flags & IFA_F_PERMANENT && !(ifp->flags & IFA_F_NOPREFIXROUTE)) 1321 action = check_cleanup_prefix_route(ifp, &expires); 1322 1323 list_del_rcu(&ifp->if_list); 1324 __in6_ifa_put(ifp); 1325 1326 write_unlock_bh(&ifp->idev->lock); 1327 1328 addrconf_del_dad_work(ifp); 1329 1330 ipv6_ifa_notify(RTM_DELADDR, ifp); 1331 1332 inet6addr_notifier_call_chain(NETDEV_DOWN, ifp); 1333 1334 if (action != CLEANUP_PREFIX_RT_NOP) { 1335 cleanup_prefix_route(ifp, expires, 1336 action == CLEANUP_PREFIX_RT_DEL, false); 1337 } 1338 1339 /* clean up prefsrc entries */ 1340 rt6_remove_prefsrc(ifp); 1341out: 1342 in6_ifa_put(ifp); 1343} 1344 1345static unsigned long ipv6_get_regen_advance(const struct inet6_dev *idev) 1346{ 1347 return READ_ONCE(idev->cnf.regen_min_advance) + 1348 READ_ONCE(idev->cnf.regen_max_retry) * 1349 READ_ONCE(idev->cnf.dad_transmits) * 1350 max(NEIGH_VAR(idev->nd_parms, RETRANS_TIME), HZ/100) / HZ; 1351} 1352 1353static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, bool block) 1354{ 1355 struct inet6_dev *idev = ifp->idev; 1356 unsigned long tmp_tstamp, age; 1357 unsigned long regen_advance; 1358 unsigned long now = jiffies; 1359 u32 if_public_preferred_lft; 1360 s32 cnf_temp_preferred_lft; 1361 struct inet6_ifaddr *ift; 1362 struct ifa6_config cfg; 1363 long max_desync_factor; 1364 struct in6_addr addr; 1365 int ret = 0; 1366 1367 write_lock_bh(&idev->lock); 1368 1369retry: 1370 in6_dev_hold(idev); 1371 if (READ_ONCE(idev->cnf.use_tempaddr) <= 0) { 1372 write_unlock_bh(&idev->lock); 1373 pr_info("%s: use_tempaddr is disabled\n", __func__); 1374 in6_dev_put(idev); 1375 ret = -1; 1376 goto out; 1377 } 1378 spin_lock_bh(&ifp->lock); 1379 if (ifp->regen_count++ >= READ_ONCE(idev->cnf.regen_max_retry)) { 1380 WRITE_ONCE(idev->cnf.use_tempaddr, -1); /*XXX*/ 1381 spin_unlock_bh(&ifp->lock); 1382 write_unlock_bh(&idev->lock); 1383 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n", 1384 __func__); 1385 in6_dev_put(idev); 1386 ret = -1; 1387 goto out; 1388 } 1389 in6_ifa_hold(ifp); 1390 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8); 1391 ipv6_gen_rnd_iid(&addr); 1392 1393 age = (now - ifp->tstamp) / HZ; 1394 1395 regen_advance = ipv6_get_regen_advance(idev); 1396 1397 /* recalculate max_desync_factor each time and update 1398 * idev->desync_factor if it's larger 1399 */ 1400 cnf_temp_preferred_lft = READ_ONCE(idev->cnf.temp_prefered_lft); 1401 max_desync_factor = min_t(long, 1402 READ_ONCE(idev->cnf.max_desync_factor), 1403 cnf_temp_preferred_lft - regen_advance); 1404 1405 if (unlikely(idev->desync_factor > max_desync_factor)) { 1406 if (max_desync_factor > 0) { 1407 get_random_bytes(&idev->desync_factor, 1408 sizeof(idev->desync_factor)); 1409 idev->desync_factor %= max_desync_factor; 1410 } else { 1411 idev->desync_factor = 0; 1412 } 1413 } 1414 1415 if_public_preferred_lft = ifp->prefered_lft; 1416 1417 memset(&cfg, 0, sizeof(cfg)); 1418 cfg.valid_lft = min_t(__u32, ifp->valid_lft, 1419 READ_ONCE(idev->cnf.temp_valid_lft) + age); 1420 cfg.preferred_lft = cnf_temp_preferred_lft + age - idev->desync_factor; 1421 cfg.preferred_lft = min_t(__u32, if_public_preferred_lft, cfg.preferred_lft); 1422 cfg.preferred_lft = min_t(__u32, cfg.valid_lft, cfg.preferred_lft); 1423 1424 cfg.plen = ifp->prefix_len; 1425 tmp_tstamp = ifp->tstamp; 1426 spin_unlock_bh(&ifp->lock); 1427 1428 write_unlock_bh(&idev->lock); 1429 1430 /* From RFC 4941: 1431 * 1432 * A temporary address is created only if this calculated Preferred 1433 * Lifetime is greater than REGEN_ADVANCE time units. In 1434 * particular, an implementation must not create a temporary address 1435 * with a zero Preferred Lifetime. 1436 * 1437 * ... 1438 * 1439 * When creating a temporary address, the lifetime values MUST be 1440 * derived from the corresponding prefix as follows: 1441 * 1442 * ... 1443 * 1444 * * Its Preferred Lifetime is the lower of the Preferred Lifetime 1445 * of the public address or TEMP_PREFERRED_LIFETIME - 1446 * DESYNC_FACTOR. 1447 * 1448 * To comply with the RFC's requirements, clamp the preferred lifetime 1449 * to a minimum of regen_advance, unless that would exceed valid_lft or 1450 * ifp->prefered_lft. 1451 * 1452 * Use age calculation as in addrconf_verify to avoid unnecessary 1453 * temporary addresses being generated. 1454 */ 1455 age = (now - tmp_tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ; 1456 if (cfg.preferred_lft <= regen_advance + age) { 1457 cfg.preferred_lft = regen_advance + age + 1; 1458 if (cfg.preferred_lft > cfg.valid_lft || 1459 cfg.preferred_lft > if_public_preferred_lft) { 1460 in6_ifa_put(ifp); 1461 in6_dev_put(idev); 1462 ret = -1; 1463 goto out; 1464 } 1465 } 1466 1467 cfg.ifa_flags = IFA_F_TEMPORARY; 1468 /* set in addrconf_prefix_rcv() */ 1469 if (ifp->flags & IFA_F_OPTIMISTIC) 1470 cfg.ifa_flags |= IFA_F_OPTIMISTIC; 1471 1472 cfg.pfx = &addr; 1473 cfg.scope = ipv6_addr_scope(cfg.pfx); 1474 1475 ift = ipv6_add_addr(idev, &cfg, block, NULL); 1476 if (IS_ERR(ift)) { 1477 in6_ifa_put(ifp); 1478 in6_dev_put(idev); 1479 pr_info("%s: retry temporary address regeneration\n", __func__); 1480 write_lock_bh(&idev->lock); 1481 goto retry; 1482 } 1483 1484 spin_lock_bh(&ift->lock); 1485 ift->ifpub = ifp; 1486 ift->cstamp = now; 1487 ift->tstamp = tmp_tstamp; 1488 spin_unlock_bh(&ift->lock); 1489 1490 addrconf_dad_start(ift); 1491 in6_ifa_put(ift); 1492 in6_dev_put(idev); 1493out: 1494 return ret; 1495} 1496 1497/* 1498 * Choose an appropriate source address (RFC3484) 1499 */ 1500enum { 1501 IPV6_SADDR_RULE_INIT = 0, 1502 IPV6_SADDR_RULE_LOCAL, 1503 IPV6_SADDR_RULE_SCOPE, 1504 IPV6_SADDR_RULE_PREFERRED, 1505#ifdef CONFIG_IPV6_MIP6 1506 IPV6_SADDR_RULE_HOA, 1507#endif 1508 IPV6_SADDR_RULE_OIF, 1509 IPV6_SADDR_RULE_LABEL, 1510 IPV6_SADDR_RULE_PRIVACY, 1511 IPV6_SADDR_RULE_ORCHID, 1512 IPV6_SADDR_RULE_PREFIX, 1513#ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1514 IPV6_SADDR_RULE_NOT_OPTIMISTIC, 1515#endif 1516 IPV6_SADDR_RULE_MAX 1517}; 1518 1519struct ipv6_saddr_score { 1520 int rule; 1521 int addr_type; 1522 struct inet6_ifaddr *ifa; 1523 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX); 1524 int scopedist; 1525 int matchlen; 1526}; 1527 1528struct ipv6_saddr_dst { 1529 const struct in6_addr *addr; 1530 int ifindex; 1531 int scope; 1532 int label; 1533 unsigned int prefs; 1534}; 1535 1536static inline int ipv6_saddr_preferred(int type) 1537{ 1538 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK)) 1539 return 1; 1540 return 0; 1541} 1542 1543static bool ipv6_use_optimistic_addr(const struct net *net, 1544 const struct inet6_dev *idev) 1545{ 1546#ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1547 if (!idev) 1548 return false; 1549 if (!READ_ONCE(net->ipv6.devconf_all->optimistic_dad) && 1550 !READ_ONCE(idev->cnf.optimistic_dad)) 1551 return false; 1552 if (!READ_ONCE(net->ipv6.devconf_all->use_optimistic) && 1553 !READ_ONCE(idev->cnf.use_optimistic)) 1554 return false; 1555 1556 return true; 1557#else 1558 return false; 1559#endif 1560} 1561 1562static bool ipv6_allow_optimistic_dad(const struct net *net, 1563 const struct inet6_dev *idev) 1564{ 1565#ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1566 if (!idev) 1567 return false; 1568 if (!READ_ONCE(net->ipv6.devconf_all->optimistic_dad) && 1569 !READ_ONCE(idev->cnf.optimistic_dad)) 1570 return false; 1571 1572 return true; 1573#else 1574 return false; 1575#endif 1576} 1577 1578static int ipv6_get_saddr_eval(struct net *net, 1579 struct ipv6_saddr_score *score, 1580 struct ipv6_saddr_dst *dst, 1581 int i) 1582{ 1583 int ret; 1584 1585 if (i <= score->rule) { 1586 switch (i) { 1587 case IPV6_SADDR_RULE_SCOPE: 1588 ret = score->scopedist; 1589 break; 1590 case IPV6_SADDR_RULE_PREFIX: 1591 ret = score->matchlen; 1592 break; 1593 default: 1594 ret = !!test_bit(i, score->scorebits); 1595 } 1596 goto out; 1597 } 1598 1599 switch (i) { 1600 case IPV6_SADDR_RULE_INIT: 1601 /* Rule 0: remember if hiscore is not ready yet */ 1602 ret = !!score->ifa; 1603 break; 1604 case IPV6_SADDR_RULE_LOCAL: 1605 /* Rule 1: Prefer same address */ 1606 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr); 1607 break; 1608 case IPV6_SADDR_RULE_SCOPE: 1609 /* Rule 2: Prefer appropriate scope 1610 * 1611 * ret 1612 * ^ 1613 * -1 | d 15 1614 * ---+--+-+---> scope 1615 * | 1616 * | d is scope of the destination. 1617 * B-d | \ 1618 * | \ <- smaller scope is better if 1619 * B-15 | \ if scope is enough for destination. 1620 * | ret = B - scope (-1 <= scope >= d <= 15). 1621 * d-C-1 | / 1622 * |/ <- greater is better 1623 * -C / if scope is not enough for destination. 1624 * /| ret = scope - C (-1 <= d < scope <= 15). 1625 * 1626 * d - C - 1 < B -15 (for all -1 <= d <= 15). 1627 * C > d + 14 - B >= 15 + 14 - B = 29 - B. 1628 * Assume B = 0 and we get C > 29. 1629 */ 1630 ret = __ipv6_addr_src_scope(score->addr_type); 1631 if (ret >= dst->scope) 1632 ret = -ret; 1633 else 1634 ret -= 128; /* 30 is enough */ 1635 score->scopedist = ret; 1636 break; 1637 case IPV6_SADDR_RULE_PREFERRED: 1638 { 1639 /* Rule 3: Avoid deprecated and optimistic addresses */ 1640 u8 avoid = IFA_F_DEPRECATED; 1641 1642 if (!ipv6_use_optimistic_addr(net, score->ifa->idev)) 1643 avoid |= IFA_F_OPTIMISTIC; 1644 ret = ipv6_saddr_preferred(score->addr_type) || 1645 !(score->ifa->flags & avoid); 1646 break; 1647 } 1648#ifdef CONFIG_IPV6_MIP6 1649 case IPV6_SADDR_RULE_HOA: 1650 { 1651 /* Rule 4: Prefer home address */ 1652 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA); 1653 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome; 1654 break; 1655 } 1656#endif 1657 case IPV6_SADDR_RULE_OIF: 1658 /* Rule 5: Prefer outgoing interface */ 1659 ret = (!dst->ifindex || 1660 dst->ifindex == score->ifa->idev->dev->ifindex); 1661 break; 1662 case IPV6_SADDR_RULE_LABEL: 1663 /* Rule 6: Prefer matching label */ 1664 ret = ipv6_addr_label(net, 1665 &score->ifa->addr, score->addr_type, 1666 score->ifa->idev->dev->ifindex) == dst->label; 1667 break; 1668 case IPV6_SADDR_RULE_PRIVACY: 1669 { 1670 /* Rule 7: Prefer public address 1671 * Note: prefer temporary address if use_tempaddr >= 2 1672 */ 1673 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ? 1674 !!(dst->prefs & IPV6_PREFER_SRC_TMP) : 1675 READ_ONCE(score->ifa->idev->cnf.use_tempaddr) >= 2; 1676 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp; 1677 break; 1678 } 1679 case IPV6_SADDR_RULE_ORCHID: 1680 /* Rule 8-: Prefer ORCHID vs ORCHID or 1681 * non-ORCHID vs non-ORCHID 1682 */ 1683 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^ 1684 ipv6_addr_orchid(dst->addr)); 1685 break; 1686 case IPV6_SADDR_RULE_PREFIX: 1687 /* Rule 8: Use longest matching prefix */ 1688 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr); 1689 if (ret > score->ifa->prefix_len) 1690 ret = score->ifa->prefix_len; 1691 score->matchlen = ret; 1692 break; 1693#ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1694 case IPV6_SADDR_RULE_NOT_OPTIMISTIC: 1695 /* Optimistic addresses still have lower precedence than other 1696 * preferred addresses. 1697 */ 1698 ret = !(score->ifa->flags & IFA_F_OPTIMISTIC); 1699 break; 1700#endif 1701 default: 1702 ret = 0; 1703 } 1704 1705 if (ret) 1706 __set_bit(i, score->scorebits); 1707 score->rule = i; 1708out: 1709 return ret; 1710} 1711 1712static int __ipv6_dev_get_saddr(struct net *net, 1713 struct ipv6_saddr_dst *dst, 1714 struct inet6_dev *idev, 1715 struct ipv6_saddr_score *scores, 1716 int hiscore_idx) 1717{ 1718 struct ipv6_saddr_score *score = &scores[1 - hiscore_idx], *hiscore = &scores[hiscore_idx]; 1719 1720 list_for_each_entry_rcu(score->ifa, &idev->addr_list, if_list) { 1721 int i; 1722 1723 /* 1724 * - Tentative Address (RFC2462 section 5.4) 1725 * - A tentative address is not considered 1726 * "assigned to an interface" in the traditional 1727 * sense, unless it is also flagged as optimistic. 1728 * - Candidate Source Address (section 4) 1729 * - In any case, anycast addresses, multicast 1730 * addresses, and the unspecified address MUST 1731 * NOT be included in a candidate set. 1732 */ 1733 if ((score->ifa->flags & IFA_F_TENTATIVE) && 1734 (!(score->ifa->flags & IFA_F_OPTIMISTIC))) 1735 continue; 1736 1737 score->addr_type = __ipv6_addr_type(&score->ifa->addr); 1738 1739 if (unlikely(score->addr_type == IPV6_ADDR_ANY || 1740 score->addr_type & IPV6_ADDR_MULTICAST)) { 1741 net_dbg_ratelimited("ADDRCONF: unspecified / multicast address assigned as unicast address on %s", 1742 idev->dev->name); 1743 continue; 1744 } 1745 1746 score->rule = -1; 1747 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX); 1748 1749 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) { 1750 int minihiscore, miniscore; 1751 1752 minihiscore = ipv6_get_saddr_eval(net, hiscore, dst, i); 1753 miniscore = ipv6_get_saddr_eval(net, score, dst, i); 1754 1755 if (minihiscore > miniscore) { 1756 if (i == IPV6_SADDR_RULE_SCOPE && 1757 score->scopedist > 0) { 1758 /* 1759 * special case: 1760 * each remaining entry 1761 * has too small (not enough) 1762 * scope, because ifa entries 1763 * are sorted by their scope 1764 * values. 1765 */ 1766 goto out; 1767 } 1768 break; 1769 } else if (minihiscore < miniscore) { 1770 swap(hiscore, score); 1771 hiscore_idx = 1 - hiscore_idx; 1772 1773 /* restore our iterator */ 1774 score->ifa = hiscore->ifa; 1775 1776 break; 1777 } 1778 } 1779 } 1780out: 1781 return hiscore_idx; 1782} 1783 1784static int ipv6_get_saddr_master(struct net *net, 1785 const struct net_device *dst_dev, 1786 const struct net_device *master, 1787 struct ipv6_saddr_dst *dst, 1788 struct ipv6_saddr_score *scores, 1789 int hiscore_idx) 1790{ 1791 struct inet6_dev *idev; 1792 1793 idev = __in6_dev_get(dst_dev); 1794 if (idev) 1795 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev, 1796 scores, hiscore_idx); 1797 1798 idev = __in6_dev_get(master); 1799 if (idev) 1800 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev, 1801 scores, hiscore_idx); 1802 1803 return hiscore_idx; 1804} 1805 1806int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev, 1807 const struct in6_addr *daddr, unsigned int prefs, 1808 struct in6_addr *saddr) 1809{ 1810 struct ipv6_saddr_score scores[2], *hiscore; 1811 struct ipv6_saddr_dst dst; 1812 struct inet6_dev *idev; 1813 struct net_device *dev; 1814 int dst_type; 1815 bool use_oif_addr = false; 1816 int hiscore_idx = 0; 1817 int ret = 0; 1818 1819 dst_type = __ipv6_addr_type(daddr); 1820 dst.addr = daddr; 1821 dst.ifindex = dst_dev ? dst_dev->ifindex : 0; 1822 dst.scope = __ipv6_addr_src_scope(dst_type); 1823 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex); 1824 dst.prefs = prefs; 1825 1826 scores[hiscore_idx].rule = -1; 1827 scores[hiscore_idx].ifa = NULL; 1828 1829 rcu_read_lock(); 1830 1831 /* Candidate Source Address (section 4) 1832 * - multicast and link-local destination address, 1833 * the set of candidate source address MUST only 1834 * include addresses assigned to interfaces 1835 * belonging to the same link as the outgoing 1836 * interface. 1837 * (- For site-local destination addresses, the 1838 * set of candidate source addresses MUST only 1839 * include addresses assigned to interfaces 1840 * belonging to the same site as the outgoing 1841 * interface.) 1842 * - "It is RECOMMENDED that the candidate source addresses 1843 * be the set of unicast addresses assigned to the 1844 * interface that will be used to send to the destination 1845 * (the 'outgoing' interface)." (RFC 6724) 1846 */ 1847 if (dst_dev) { 1848 idev = __in6_dev_get(dst_dev); 1849 if ((dst_type & IPV6_ADDR_MULTICAST) || 1850 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL || 1851 (idev && READ_ONCE(idev->cnf.use_oif_addrs_only))) { 1852 use_oif_addr = true; 1853 } 1854 } 1855 1856 if (use_oif_addr) { 1857 if (idev) 1858 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx); 1859 } else { 1860 const struct net_device *master; 1861 int master_idx = 0; 1862 1863 /* if dst_dev exists and is enslaved to an L3 device, then 1864 * prefer addresses from dst_dev and then the master over 1865 * any other enslaved devices in the L3 domain. 1866 */ 1867 master = l3mdev_master_dev_rcu(dst_dev); 1868 if (master) { 1869 master_idx = master->ifindex; 1870 1871 hiscore_idx = ipv6_get_saddr_master(net, dst_dev, 1872 master, &dst, 1873 scores, hiscore_idx); 1874 1875 if (scores[hiscore_idx].ifa) 1876 goto out; 1877 } 1878 1879 for_each_netdev_rcu(net, dev) { 1880 /* only consider addresses on devices in the 1881 * same L3 domain 1882 */ 1883 if (l3mdev_master_ifindex_rcu(dev) != master_idx) 1884 continue; 1885 idev = __in6_dev_get(dev); 1886 if (!idev) 1887 continue; 1888 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx); 1889 } 1890 } 1891 1892out: 1893 hiscore = &scores[hiscore_idx]; 1894 if (!hiscore->ifa) 1895 ret = -EADDRNOTAVAIL; 1896 else 1897 *saddr = hiscore->ifa->addr; 1898 1899 rcu_read_unlock(); 1900 return ret; 1901} 1902EXPORT_SYMBOL(ipv6_dev_get_saddr); 1903 1904static int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr, 1905 u32 banned_flags) 1906{ 1907 struct inet6_ifaddr *ifp; 1908 int err = -EADDRNOTAVAIL; 1909 1910 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) { 1911 if (ifp->scope > IFA_LINK) 1912 break; 1913 if (ifp->scope == IFA_LINK && 1914 !(ifp->flags & banned_flags)) { 1915 *addr = ifp->addr; 1916 err = 0; 1917 break; 1918 } 1919 } 1920 return err; 1921} 1922 1923int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr, 1924 u32 banned_flags) 1925{ 1926 struct inet6_dev *idev; 1927 int err = -EADDRNOTAVAIL; 1928 1929 rcu_read_lock(); 1930 idev = __in6_dev_get(dev); 1931 if (idev) { 1932 read_lock_bh(&idev->lock); 1933 err = __ipv6_get_lladdr(idev, addr, banned_flags); 1934 read_unlock_bh(&idev->lock); 1935 } 1936 rcu_read_unlock(); 1937 return err; 1938} 1939 1940static int ipv6_count_addresses(const struct inet6_dev *idev) 1941{ 1942 const struct inet6_ifaddr *ifp; 1943 int cnt = 0; 1944 1945 rcu_read_lock(); 1946 list_for_each_entry_rcu(ifp, &idev->addr_list, if_list) 1947 cnt++; 1948 rcu_read_unlock(); 1949 return cnt; 1950} 1951 1952int ipv6_chk_addr(struct net *net, const struct in6_addr *addr, 1953 const struct net_device *dev, int strict) 1954{ 1955 return ipv6_chk_addr_and_flags(net, addr, dev, !dev, 1956 strict, IFA_F_TENTATIVE); 1957} 1958EXPORT_SYMBOL(ipv6_chk_addr); 1959 1960/* device argument is used to find the L3 domain of interest. If 1961 * skip_dev_check is set, then the ifp device is not checked against 1962 * the passed in dev argument. So the 2 cases for addresses checks are: 1963 * 1. does the address exist in the L3 domain that dev is part of 1964 * (skip_dev_check = true), or 1965 * 1966 * 2. does the address exist on the specific device 1967 * (skip_dev_check = false) 1968 */ 1969static struct net_device * 1970__ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr, 1971 const struct net_device *dev, bool skip_dev_check, 1972 int strict, u32 banned_flags) 1973{ 1974 unsigned int hash = inet6_addr_hash(net, addr); 1975 struct net_device *l3mdev, *ndev; 1976 struct inet6_ifaddr *ifp; 1977 u32 ifp_flags; 1978 1979 rcu_read_lock(); 1980 1981 l3mdev = l3mdev_master_dev_rcu(dev); 1982 if (skip_dev_check) 1983 dev = NULL; 1984 1985 hlist_for_each_entry_rcu(ifp, &net->ipv6.inet6_addr_lst[hash], addr_lst) { 1986 ndev = ifp->idev->dev; 1987 1988 if (l3mdev_master_dev_rcu(ndev) != l3mdev) 1989 continue; 1990 1991 /* Decouple optimistic from tentative for evaluation here. 1992 * Ban optimistic addresses explicitly, when required. 1993 */ 1994 ifp_flags = (ifp->flags&IFA_F_OPTIMISTIC) 1995 ? (ifp->flags&~IFA_F_TENTATIVE) 1996 : ifp->flags; 1997 if (ipv6_addr_equal(&ifp->addr, addr) && 1998 !(ifp_flags&banned_flags) && 1999 (!dev || ndev == dev || 2000 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) { 2001 rcu_read_unlock(); 2002 return ndev; 2003 } 2004 } 2005 2006 rcu_read_unlock(); 2007 return NULL; 2008} 2009 2010int ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr, 2011 const struct net_device *dev, bool skip_dev_check, 2012 int strict, u32 banned_flags) 2013{ 2014 return __ipv6_chk_addr_and_flags(net, addr, dev, skip_dev_check, 2015 strict, banned_flags) ? 1 : 0; 2016} 2017EXPORT_SYMBOL(ipv6_chk_addr_and_flags); 2018 2019 2020/* Compares an address/prefix_len with addresses on device @dev. 2021 * If one is found it returns true. 2022 */ 2023bool ipv6_chk_custom_prefix(const struct in6_addr *addr, 2024 const unsigned int prefix_len, struct net_device *dev) 2025{ 2026 const struct inet6_ifaddr *ifa; 2027 const struct inet6_dev *idev; 2028 bool ret = false; 2029 2030 rcu_read_lock(); 2031 idev = __in6_dev_get(dev); 2032 if (idev) { 2033 list_for_each_entry_rcu(ifa, &idev->addr_list, if_list) { 2034 ret = ipv6_prefix_equal(addr, &ifa->addr, prefix_len); 2035 if (ret) 2036 break; 2037 } 2038 } 2039 rcu_read_unlock(); 2040 2041 return ret; 2042} 2043EXPORT_SYMBOL(ipv6_chk_custom_prefix); 2044 2045int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev) 2046{ 2047 const struct inet6_ifaddr *ifa; 2048 const struct inet6_dev *idev; 2049 int onlink; 2050 2051 onlink = 0; 2052 rcu_read_lock(); 2053 idev = __in6_dev_get(dev); 2054 if (idev) { 2055 list_for_each_entry_rcu(ifa, &idev->addr_list, if_list) { 2056 onlink = ipv6_prefix_equal(addr, &ifa->addr, 2057 ifa->prefix_len); 2058 if (onlink) 2059 break; 2060 } 2061 } 2062 rcu_read_unlock(); 2063 return onlink; 2064} 2065EXPORT_SYMBOL(ipv6_chk_prefix); 2066 2067/** 2068 * ipv6_dev_find - find the first device with a given source address. 2069 * @net: the net namespace 2070 * @addr: the source address 2071 * @dev: used to find the L3 domain of interest 2072 * 2073 * The caller should be protected by RCU, or RTNL. 2074 */ 2075struct net_device *ipv6_dev_find(struct net *net, const struct in6_addr *addr, 2076 struct net_device *dev) 2077{ 2078 return __ipv6_chk_addr_and_flags(net, addr, dev, !dev, 1, 2079 IFA_F_TENTATIVE); 2080} 2081EXPORT_SYMBOL(ipv6_dev_find); 2082 2083struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr, 2084 struct net_device *dev, int strict) 2085{ 2086 unsigned int hash = inet6_addr_hash(net, addr); 2087 struct inet6_ifaddr *ifp, *result = NULL; 2088 2089 rcu_read_lock(); 2090 hlist_for_each_entry_rcu(ifp, &net->ipv6.inet6_addr_lst[hash], addr_lst) { 2091 if (ipv6_addr_equal(&ifp->addr, addr)) { 2092 if (!dev || ifp->idev->dev == dev || 2093 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) { 2094 if (in6_ifa_hold_safe(ifp)) { 2095 result = ifp; 2096 break; 2097 } 2098 } 2099 } 2100 } 2101 rcu_read_unlock(); 2102 2103 return result; 2104} 2105 2106/* Gets referenced address, destroys ifaddr */ 2107 2108static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed) 2109{ 2110 if (dad_failed) 2111 ifp->flags |= IFA_F_DADFAILED; 2112 2113 if (ifp->flags&IFA_F_TEMPORARY) { 2114 struct inet6_ifaddr *ifpub; 2115 spin_lock_bh(&ifp->lock); 2116 ifpub = ifp->ifpub; 2117 if (ifpub) { 2118 in6_ifa_hold(ifpub); 2119 spin_unlock_bh(&ifp->lock); 2120 ipv6_create_tempaddr(ifpub, true); 2121 in6_ifa_put(ifpub); 2122 } else { 2123 spin_unlock_bh(&ifp->lock); 2124 } 2125 ipv6_del_addr(ifp); 2126 } else if (ifp->flags&IFA_F_PERMANENT || !dad_failed) { 2127 spin_lock_bh(&ifp->lock); 2128 addrconf_del_dad_work(ifp); 2129 ifp->flags |= IFA_F_TENTATIVE; 2130 if (dad_failed) 2131 ifp->flags &= ~IFA_F_OPTIMISTIC; 2132 spin_unlock_bh(&ifp->lock); 2133 if (dad_failed) 2134 ipv6_ifa_notify(0, ifp); 2135 in6_ifa_put(ifp); 2136 } else { 2137 ipv6_del_addr(ifp); 2138 } 2139} 2140 2141static int addrconf_dad_end(struct inet6_ifaddr *ifp) 2142{ 2143 int err = -ENOENT; 2144 2145 spin_lock_bh(&ifp->lock); 2146 if (ifp->state == INET6_IFADDR_STATE_DAD) { 2147 ifp->state = INET6_IFADDR_STATE_POSTDAD; 2148 err = 0; 2149 } 2150 spin_unlock_bh(&ifp->lock); 2151 2152 return err; 2153} 2154 2155void addrconf_dad_failure(struct sk_buff *skb, struct inet6_ifaddr *ifp) 2156{ 2157 struct inet6_dev *idev = ifp->idev; 2158 struct net *net = dev_net(idev->dev); 2159 int max_addresses; 2160 2161 if (addrconf_dad_end(ifp)) { 2162 in6_ifa_put(ifp); 2163 return; 2164 } 2165 2166 net_info_ratelimited("%s: IPv6 duplicate address %pI6c used by %pM detected!\n", 2167 ifp->idev->dev->name, &ifp->addr, eth_hdr(skb)->h_source); 2168 2169 spin_lock_bh(&ifp->lock); 2170 2171 if (ifp->flags & IFA_F_STABLE_PRIVACY) { 2172 struct in6_addr new_addr; 2173 struct inet6_ifaddr *ifp2; 2174 int retries = ifp->stable_privacy_retry + 1; 2175 struct ifa6_config cfg = { 2176 .pfx = &new_addr, 2177 .plen = ifp->prefix_len, 2178 .ifa_flags = ifp->flags, 2179 .valid_lft = ifp->valid_lft, 2180 .preferred_lft = ifp->prefered_lft, 2181 .scope = ifp->scope, 2182 }; 2183 2184 if (retries > net->ipv6.sysctl.idgen_retries) { 2185 net_info_ratelimited("%s: privacy stable address generation failed because of DAD conflicts!\n", 2186 ifp->idev->dev->name); 2187 goto errdad; 2188 } 2189 2190 new_addr = ifp->addr; 2191 if (ipv6_generate_stable_address(&new_addr, retries, 2192 idev)) 2193 goto errdad; 2194 2195 spin_unlock_bh(&ifp->lock); 2196 2197 max_addresses = READ_ONCE(idev->cnf.max_addresses); 2198 if (max_addresses && 2199 ipv6_count_addresses(idev) >= max_addresses) 2200 goto lock_errdad; 2201 2202 net_info_ratelimited("%s: generating new stable privacy address because of DAD conflict\n", 2203 ifp->idev->dev->name); 2204 2205 ifp2 = ipv6_add_addr(idev, &cfg, false, NULL); 2206 if (IS_ERR(ifp2)) 2207 goto lock_errdad; 2208 2209 spin_lock_bh(&ifp2->lock); 2210 ifp2->stable_privacy_retry = retries; 2211 ifp2->state = INET6_IFADDR_STATE_PREDAD; 2212 spin_unlock_bh(&ifp2->lock); 2213 2214 addrconf_mod_dad_work(ifp2, net->ipv6.sysctl.idgen_delay); 2215 in6_ifa_put(ifp2); 2216lock_errdad: 2217 spin_lock_bh(&ifp->lock); 2218 } 2219 2220errdad: 2221 /* transition from _POSTDAD to _ERRDAD */ 2222 ifp->state = INET6_IFADDR_STATE_ERRDAD; 2223 spin_unlock_bh(&ifp->lock); 2224 2225 addrconf_mod_dad_work(ifp, 0); 2226 in6_ifa_put(ifp); 2227} 2228 2229/* Join to solicited addr multicast group. 2230 * caller must hold RTNL */ 2231void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr) 2232{ 2233 struct in6_addr maddr; 2234 2235 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP)) 2236 return; 2237 2238 addrconf_addr_solict_mult(addr, &maddr); 2239 ipv6_dev_mc_inc(dev, &maddr); 2240} 2241 2242/* caller must hold RTNL */ 2243void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr) 2244{ 2245 struct in6_addr maddr; 2246 2247 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP)) 2248 return; 2249 2250 addrconf_addr_solict_mult(addr, &maddr); 2251 __ipv6_dev_mc_dec(idev, &maddr); 2252} 2253 2254/* caller must hold RTNL */ 2255static void addrconf_join_anycast(struct inet6_ifaddr *ifp) 2256{ 2257 struct in6_addr addr; 2258 2259 if (ifp->prefix_len >= 127) /* RFC 6164 */ 2260 return; 2261 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len); 2262 if (ipv6_addr_any(&addr)) 2263 return; 2264 __ipv6_dev_ac_inc(ifp->idev, &addr); 2265} 2266 2267/* caller must hold RTNL */ 2268static void addrconf_leave_anycast(struct inet6_ifaddr *ifp) 2269{ 2270 struct in6_addr addr; 2271 2272 if (ifp->prefix_len >= 127) /* RFC 6164 */ 2273 return; 2274 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len); 2275 if (ipv6_addr_any(&addr)) 2276 return; 2277 __ipv6_dev_ac_dec(ifp->idev, &addr); 2278} 2279 2280static int addrconf_ifid_6lowpan(u8 *eui, struct net_device *dev) 2281{ 2282 switch (dev->addr_len) { 2283 case ETH_ALEN: 2284 memcpy(eui, dev->dev_addr, 3); 2285 eui[3] = 0xFF; 2286 eui[4] = 0xFE; 2287 memcpy(eui + 5, dev->dev_addr + 3, 3); 2288 break; 2289 case EUI64_ADDR_LEN: 2290 memcpy(eui, dev->dev_addr, EUI64_ADDR_LEN); 2291 eui[0] ^= 2; 2292 break; 2293 default: 2294 return -1; 2295 } 2296 2297 return 0; 2298} 2299 2300static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev) 2301{ 2302 const union fwnet_hwaddr *ha; 2303 2304 if (dev->addr_len != FWNET_ALEN) 2305 return -1; 2306 2307 ha = (const union fwnet_hwaddr *)dev->dev_addr; 2308 2309 memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id)); 2310 eui[0] ^= 2; 2311 return 0; 2312} 2313 2314static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev) 2315{ 2316 /* XXX: inherit EUI-64 from other interface -- yoshfuji */ 2317 if (dev->addr_len != ARCNET_ALEN) 2318 return -1; 2319 memset(eui, 0, 7); 2320 eui[7] = *(u8 *)dev->dev_addr; 2321 return 0; 2322} 2323 2324static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev) 2325{ 2326 if (dev->addr_len != INFINIBAND_ALEN) 2327 return -1; 2328 memcpy(eui, dev->dev_addr + 12, 8); 2329 eui[0] |= 2; 2330 return 0; 2331} 2332 2333static int __ipv6_isatap_ifid(u8 *eui, __be32 addr) 2334{ 2335 if (addr == 0) 2336 return -1; 2337 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) || 2338 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) || 2339 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) || 2340 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) || 2341 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) || 2342 ipv4_is_lbcast(addr)) ? 0x00 : 0x02; 2343 eui[1] = 0; 2344 eui[2] = 0x5E; 2345 eui[3] = 0xFE; 2346 memcpy(eui + 4, &addr, 4); 2347 return 0; 2348} 2349 2350static int addrconf_ifid_sit(u8 *eui, struct net_device *dev) 2351{ 2352 if (dev->priv_flags & IFF_ISATAP) 2353 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr); 2354 return -1; 2355} 2356 2357static int addrconf_ifid_gre(u8 *eui, struct net_device *dev) 2358{ 2359 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr); 2360} 2361 2362static int addrconf_ifid_ip6tnl(u8 *eui, struct net_device *dev) 2363{ 2364 memcpy(eui, dev->perm_addr, 3); 2365 memcpy(eui + 5, dev->perm_addr + 3, 3); 2366 eui[3] = 0xFF; 2367 eui[4] = 0xFE; 2368 eui[0] ^= 2; 2369 return 0; 2370} 2371 2372static int ipv6_generate_eui64(u8 *eui, struct net_device *dev) 2373{ 2374 switch (dev->type) { 2375 case ARPHRD_ETHER: 2376 case ARPHRD_FDDI: 2377 return addrconf_ifid_eui48(eui, dev); 2378 case ARPHRD_ARCNET: 2379 return addrconf_ifid_arcnet(eui, dev); 2380 case ARPHRD_INFINIBAND: 2381 return addrconf_ifid_infiniband(eui, dev); 2382 case ARPHRD_SIT: 2383 return addrconf_ifid_sit(eui, dev); 2384 case ARPHRD_IPGRE: 2385 case ARPHRD_TUNNEL: 2386 return addrconf_ifid_gre(eui, dev); 2387 case ARPHRD_6LOWPAN: 2388 return addrconf_ifid_6lowpan(eui, dev); 2389 case ARPHRD_IEEE1394: 2390 return addrconf_ifid_ieee1394(eui, dev); 2391 case ARPHRD_TUNNEL6: 2392 case ARPHRD_IP6GRE: 2393 case ARPHRD_RAWIP: 2394 return addrconf_ifid_ip6tnl(eui, dev); 2395 } 2396 return -1; 2397} 2398 2399static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev) 2400{ 2401 int err = -1; 2402 struct inet6_ifaddr *ifp; 2403 2404 read_lock_bh(&idev->lock); 2405 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) { 2406 if (ifp->scope > IFA_LINK) 2407 break; 2408 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) { 2409 memcpy(eui, ifp->addr.s6_addr+8, 8); 2410 err = 0; 2411 break; 2412 } 2413 } 2414 read_unlock_bh(&idev->lock); 2415 return err; 2416} 2417 2418/* Generation of a randomized Interface Identifier 2419 * draft-ietf-6man-rfc4941bis, Section 3.3.1 2420 */ 2421 2422static void ipv6_gen_rnd_iid(struct in6_addr *addr) 2423{ 2424regen: 2425 get_random_bytes(&addr->s6_addr[8], 8); 2426 2427 /* <draft-ietf-6man-rfc4941bis-08.txt>, Section 3.3.1: 2428 * check if generated address is not inappropriate: 2429 * 2430 * - Reserved IPv6 Interface Identifiers 2431 * - XXX: already assigned to an address on the device 2432 */ 2433 2434 /* Subnet-router anycast: 0000:0000:0000:0000 */ 2435 if (!(addr->s6_addr32[2] | addr->s6_addr32[3])) 2436 goto regen; 2437 2438 /* IANA Ethernet block: 0200:5EFF:FE00:0000-0200:5EFF:FE00:5212 2439 * Proxy Mobile IPv6: 0200:5EFF:FE00:5213 2440 * IANA Ethernet block: 0200:5EFF:FE00:5214-0200:5EFF:FEFF:FFFF 2441 */ 2442 if (ntohl(addr->s6_addr32[2]) == 0x02005eff && 2443 (ntohl(addr->s6_addr32[3]) & 0Xff000000) == 0xfe000000) 2444 goto regen; 2445 2446 /* Reserved subnet anycast addresses */ 2447 if (ntohl(addr->s6_addr32[2]) == 0xfdffffff && 2448 ntohl(addr->s6_addr32[3]) >= 0Xffffff80) 2449 goto regen; 2450} 2451 2452/* 2453 * Add prefix route. 2454 */ 2455 2456static void 2457addrconf_prefix_route(struct in6_addr *pfx, int plen, u32 metric, 2458 struct net_device *dev, unsigned long expires, 2459 u32 flags, gfp_t gfp_flags) 2460{ 2461 struct fib6_config cfg = { 2462 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX, 2463 .fc_metric = metric ? : IP6_RT_PRIO_ADDRCONF, 2464 .fc_ifindex = dev->ifindex, 2465 .fc_expires = expires, 2466 .fc_dst_len = plen, 2467 .fc_flags = RTF_UP | flags, 2468 .fc_nlinfo.nl_net = dev_net(dev), 2469 .fc_protocol = RTPROT_KERNEL, 2470 .fc_type = RTN_UNICAST, 2471 }; 2472 2473 cfg.fc_dst = *pfx; 2474 2475 /* Prevent useless cloning on PtP SIT. 2476 This thing is done here expecting that the whole 2477 class of non-broadcast devices need not cloning. 2478 */ 2479#if IS_ENABLED(CONFIG_IPV6_SIT) 2480 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT)) 2481 cfg.fc_flags |= RTF_NONEXTHOP; 2482#endif 2483 2484 ip6_route_add(&cfg, gfp_flags, NULL); 2485} 2486 2487 2488static struct fib6_info *addrconf_get_prefix_route(const struct in6_addr *pfx, 2489 int plen, 2490 const struct net_device *dev, 2491 u32 flags, u32 noflags, 2492 bool no_gw) 2493{ 2494 struct fib6_node *fn; 2495 struct fib6_info *rt = NULL; 2496 struct fib6_table *table; 2497 u32 tb_id = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX; 2498 2499 table = fib6_get_table(dev_net(dev), tb_id); 2500 if (!table) 2501 return NULL; 2502 2503 rcu_read_lock(); 2504 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0, true); 2505 if (!fn) 2506 goto out; 2507 2508 for_each_fib6_node_rt_rcu(fn) { 2509 /* prefix routes only use builtin fib6_nh */ 2510 if (rt->nh) 2511 continue; 2512 2513 if (rt->fib6_nh->fib_nh_dev->ifindex != dev->ifindex) 2514 continue; 2515 if (no_gw && rt->fib6_nh->fib_nh_gw_family) 2516 continue; 2517 if ((rt->fib6_flags & flags) != flags) 2518 continue; 2519 if ((rt->fib6_flags & noflags) != 0) 2520 continue; 2521 if (!fib6_info_hold_safe(rt)) 2522 continue; 2523 break; 2524 } 2525out: 2526 rcu_read_unlock(); 2527 return rt; 2528} 2529 2530 2531/* Create "default" multicast route to the interface */ 2532 2533static void addrconf_add_mroute(struct net_device *dev) 2534{ 2535 struct fib6_config cfg = { 2536 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_LOCAL, 2537 .fc_metric = IP6_RT_PRIO_ADDRCONF, 2538 .fc_ifindex = dev->ifindex, 2539 .fc_dst_len = 8, 2540 .fc_flags = RTF_UP, 2541 .fc_type = RTN_MULTICAST, 2542 .fc_nlinfo.nl_net = dev_net(dev), 2543 .fc_protocol = RTPROT_KERNEL, 2544 }; 2545 2546 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0); 2547 2548 ip6_route_add(&cfg, GFP_KERNEL, NULL); 2549} 2550 2551static struct inet6_dev *addrconf_add_dev(struct net_device *dev) 2552{ 2553 struct inet6_dev *idev; 2554 2555 ASSERT_RTNL(); 2556 2557 idev = ipv6_find_idev(dev); 2558 if (IS_ERR(idev)) 2559 return idev; 2560 2561 if (idev->cnf.disable_ipv6) 2562 return ERR_PTR(-EACCES); 2563 2564 /* Add default multicast route */ 2565 if (!(dev->flags & IFF_LOOPBACK) && !netif_is_l3_master(dev)) 2566 addrconf_add_mroute(dev); 2567 2568 return idev; 2569} 2570 2571static void manage_tempaddrs(struct inet6_dev *idev, 2572 struct inet6_ifaddr *ifp, 2573 __u32 valid_lft, __u32 prefered_lft, 2574 bool create, unsigned long now) 2575{ 2576 u32 flags; 2577 struct inet6_ifaddr *ift; 2578 2579 read_lock_bh(&idev->lock); 2580 /* update all temporary addresses in the list */ 2581 list_for_each_entry(ift, &idev->tempaddr_list, tmp_list) { 2582 int age, max_valid, max_prefered; 2583 2584 if (ifp != ift->ifpub) 2585 continue; 2586 2587 /* RFC 4941 section 3.3: 2588 * If a received option will extend the lifetime of a public 2589 * address, the lifetimes of temporary addresses should 2590 * be extended, subject to the overall constraint that no 2591 * temporary addresses should ever remain "valid" or "preferred" 2592 * for a time longer than (TEMP_VALID_LIFETIME) or 2593 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), respectively. 2594 */ 2595 age = (now - ift->cstamp) / HZ; 2596 max_valid = READ_ONCE(idev->cnf.temp_valid_lft) - age; 2597 if (max_valid < 0) 2598 max_valid = 0; 2599 2600 max_prefered = READ_ONCE(idev->cnf.temp_prefered_lft) - 2601 idev->desync_factor - age; 2602 if (max_prefered < 0) 2603 max_prefered = 0; 2604 2605 if (valid_lft > max_valid) 2606 valid_lft = max_valid; 2607 2608 if (prefered_lft > max_prefered) 2609 prefered_lft = max_prefered; 2610 2611 spin_lock(&ift->lock); 2612 flags = ift->flags; 2613 ift->valid_lft = valid_lft; 2614 ift->prefered_lft = prefered_lft; 2615 ift->tstamp = now; 2616 if (prefered_lft > 0) 2617 ift->flags &= ~IFA_F_DEPRECATED; 2618 2619 spin_unlock(&ift->lock); 2620 if (!(flags&IFA_F_TENTATIVE)) 2621 ipv6_ifa_notify(0, ift); 2622 } 2623 2624 /* Also create a temporary address if it's enabled but no temporary 2625 * address currently exists. 2626 * However, we get called with valid_lft == 0, prefered_lft == 0, create == false 2627 * as part of cleanup (ie. deleting the mngtmpaddr). 2628 * We don't want that to result in creating a new temporary ip address. 2629 */ 2630 if (list_empty(&idev->tempaddr_list) && (valid_lft || prefered_lft)) 2631 create = true; 2632 2633 if (create && READ_ONCE(idev->cnf.use_tempaddr) > 0) { 2634 /* When a new public address is created as described 2635 * in [ADDRCONF], also create a new temporary address. 2636 */ 2637 read_unlock_bh(&idev->lock); 2638 ipv6_create_tempaddr(ifp, false); 2639 } else { 2640 read_unlock_bh(&idev->lock); 2641 } 2642} 2643 2644static bool is_addr_mode_generate_stable(struct inet6_dev *idev) 2645{ 2646 return idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY || 2647 idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_RANDOM; 2648} 2649 2650int addrconf_prefix_rcv_add_addr(struct net *net, struct net_device *dev, 2651 const struct prefix_info *pinfo, 2652 struct inet6_dev *in6_dev, 2653 const struct in6_addr *addr, int addr_type, 2654 u32 addr_flags, bool sllao, bool tokenized, 2655 __u32 valid_lft, u32 prefered_lft) 2656{ 2657 struct inet6_ifaddr *ifp = ipv6_get_ifaddr(net, addr, dev, 1); 2658 int create = 0, update_lft = 0; 2659 2660 if (!ifp && valid_lft) { 2661 int max_addresses = READ_ONCE(in6_dev->cnf.max_addresses); 2662 struct ifa6_config cfg = { 2663 .pfx = addr, 2664 .plen = pinfo->prefix_len, 2665 .ifa_flags = addr_flags, 2666 .valid_lft = valid_lft, 2667 .preferred_lft = prefered_lft, 2668 .scope = addr_type & IPV6_ADDR_SCOPE_MASK, 2669 .ifa_proto = IFAPROT_KERNEL_RA 2670 }; 2671 2672#ifdef CONFIG_IPV6_OPTIMISTIC_DAD 2673 if ((READ_ONCE(net->ipv6.devconf_all->optimistic_dad) || 2674 READ_ONCE(in6_dev->cnf.optimistic_dad)) && 2675 !net->ipv6.devconf_all->forwarding && sllao) 2676 cfg.ifa_flags |= IFA_F_OPTIMISTIC; 2677#endif 2678 2679 /* Do not allow to create too much of autoconfigured 2680 * addresses; this would be too easy way to crash kernel. 2681 */ 2682 if (!max_addresses || 2683 ipv6_count_addresses(in6_dev) < max_addresses) 2684 ifp = ipv6_add_addr(in6_dev, &cfg, false, NULL); 2685 2686 if (IS_ERR_OR_NULL(ifp)) 2687 return -1; 2688 2689 create = 1; 2690 spin_lock_bh(&ifp->lock); 2691 ifp->flags |= IFA_F_MANAGETEMPADDR; 2692 ifp->cstamp = jiffies; 2693 ifp->tokenized = tokenized; 2694 spin_unlock_bh(&ifp->lock); 2695 addrconf_dad_start(ifp); 2696 } 2697 2698 if (ifp) { 2699 u32 flags; 2700 unsigned long now; 2701 u32 stored_lft; 2702 2703 /* update lifetime (RFC2462 5.5.3 e) */ 2704 spin_lock_bh(&ifp->lock); 2705 now = jiffies; 2706 if (ifp->valid_lft > (now - ifp->tstamp) / HZ) 2707 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ; 2708 else 2709 stored_lft = 0; 2710 2711 /* RFC4862 Section 5.5.3e: 2712 * "Note that the preferred lifetime of the 2713 * corresponding address is always reset to 2714 * the Preferred Lifetime in the received 2715 * Prefix Information option, regardless of 2716 * whether the valid lifetime is also reset or 2717 * ignored." 2718 * 2719 * So we should always update prefered_lft here. 2720 */ 2721 update_lft = !create && stored_lft; 2722 2723 if (update_lft && !READ_ONCE(in6_dev->cnf.ra_honor_pio_life)) { 2724 const u32 minimum_lft = min_t(u32, 2725 stored_lft, MIN_VALID_LIFETIME); 2726 valid_lft = max(valid_lft, minimum_lft); 2727 } 2728 2729 if (update_lft) { 2730 ifp->valid_lft = valid_lft; 2731 ifp->prefered_lft = prefered_lft; 2732 WRITE_ONCE(ifp->tstamp, now); 2733 flags = ifp->flags; 2734 ifp->flags &= ~IFA_F_DEPRECATED; 2735 spin_unlock_bh(&ifp->lock); 2736 2737 if (!(flags&IFA_F_TENTATIVE)) 2738 ipv6_ifa_notify(0, ifp); 2739 } else 2740 spin_unlock_bh(&ifp->lock); 2741 2742 manage_tempaddrs(in6_dev, ifp, valid_lft, prefered_lft, 2743 create, now); 2744 2745 in6_ifa_put(ifp); 2746 addrconf_verify(net); 2747 } 2748 2749 return 0; 2750} 2751EXPORT_SYMBOL_GPL(addrconf_prefix_rcv_add_addr); 2752 2753void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao) 2754{ 2755 struct prefix_info *pinfo; 2756 struct fib6_table *table; 2757 __u32 valid_lft; 2758 __u32 prefered_lft; 2759 int addr_type, err; 2760 u32 addr_flags = 0; 2761 struct inet6_dev *in6_dev; 2762 struct net *net = dev_net(dev); 2763 2764 pinfo = (struct prefix_info *) opt; 2765 2766 if (len < sizeof(struct prefix_info)) { 2767 netdev_dbg(dev, "addrconf: prefix option too short\n"); 2768 return; 2769 } 2770 2771 /* 2772 * Validation checks ([ADDRCONF], page 19) 2773 */ 2774 2775 addr_type = ipv6_addr_type(&pinfo->prefix); 2776 2777 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL)) 2778 return; 2779 2780 valid_lft = ntohl(pinfo->valid); 2781 prefered_lft = ntohl(pinfo->prefered); 2782 2783 if (prefered_lft > valid_lft) { 2784 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n"); 2785 return; 2786 } 2787 2788 in6_dev = in6_dev_get(dev); 2789 2790 if (!in6_dev) { 2791 net_dbg_ratelimited("addrconf: device %s not configured\n", 2792 dev->name); 2793 return; 2794 } 2795 2796 if (valid_lft != 0 && valid_lft < in6_dev->cnf.accept_ra_min_lft) 2797 goto put; 2798 2799 /* 2800 * Two things going on here: 2801 * 1) Add routes for on-link prefixes 2802 * 2) Configure prefixes with the auto flag set 2803 */ 2804 2805 if (pinfo->onlink) { 2806 struct fib6_info *rt; 2807 unsigned long rt_expires; 2808 2809 /* Avoid arithmetic overflow. Really, we could 2810 * save rt_expires in seconds, likely valid_lft, 2811 * but it would require division in fib gc, that it 2812 * not good. 2813 */ 2814 if (HZ > USER_HZ) 2815 rt_expires = addrconf_timeout_fixup(valid_lft, HZ); 2816 else 2817 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ); 2818 2819 if (addrconf_finite_timeout(rt_expires)) 2820 rt_expires *= HZ; 2821 2822 rt = addrconf_get_prefix_route(&pinfo->prefix, 2823 pinfo->prefix_len, 2824 dev, 2825 RTF_ADDRCONF | RTF_PREFIX_RT, 2826 RTF_DEFAULT, true); 2827 2828 if (rt) { 2829 /* Autoconf prefix route */ 2830 if (valid_lft == 0) { 2831 ip6_del_rt(net, rt, false); 2832 rt = NULL; 2833 } else { 2834 table = rt->fib6_table; 2835 spin_lock_bh(&table->tb6_lock); 2836 2837 if (addrconf_finite_timeout(rt_expires)) { 2838 /* not infinity */ 2839 fib6_set_expires(rt, jiffies + rt_expires); 2840 fib6_add_gc_list(rt); 2841 } else { 2842 fib6_clean_expires(rt); 2843 fib6_remove_gc_list(rt); 2844 } 2845 2846 spin_unlock_bh(&table->tb6_lock); 2847 } 2848 } else if (valid_lft) { 2849 clock_t expires = 0; 2850 int flags = RTF_ADDRCONF | RTF_PREFIX_RT; 2851 if (addrconf_finite_timeout(rt_expires)) { 2852 /* not infinity */ 2853 flags |= RTF_EXPIRES; 2854 expires = jiffies_to_clock_t(rt_expires); 2855 } 2856 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len, 2857 0, dev, expires, flags, 2858 GFP_ATOMIC); 2859 } 2860 fib6_info_release(rt); 2861 } 2862 2863 /* Try to figure out our local address for this prefix */ 2864 2865 if (pinfo->autoconf && in6_dev->cnf.autoconf) { 2866 struct in6_addr addr; 2867 bool tokenized = false, dev_addr_generated = false; 2868 2869 if (pinfo->prefix_len == 64) { 2870 memcpy(&addr, &pinfo->prefix, 8); 2871 2872 if (!ipv6_addr_any(&in6_dev->token)) { 2873 read_lock_bh(&in6_dev->lock); 2874 memcpy(addr.s6_addr + 8, 2875 in6_dev->token.s6_addr + 8, 8); 2876 read_unlock_bh(&in6_dev->lock); 2877 tokenized = true; 2878 } else if (is_addr_mode_generate_stable(in6_dev) && 2879 !ipv6_generate_stable_address(&addr, 0, 2880 in6_dev)) { 2881 addr_flags |= IFA_F_STABLE_PRIVACY; 2882 goto ok; 2883 } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) && 2884 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) { 2885 goto put; 2886 } else { 2887 dev_addr_generated = true; 2888 } 2889 goto ok; 2890 } 2891 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n", 2892 pinfo->prefix_len); 2893 goto put; 2894 2895ok: 2896 err = addrconf_prefix_rcv_add_addr(net, dev, pinfo, in6_dev, 2897 &addr, addr_type, 2898 addr_flags, sllao, 2899 tokenized, valid_lft, 2900 prefered_lft); 2901 if (err) 2902 goto put; 2903 2904 /* Ignore error case here because previous prefix add addr was 2905 * successful which will be notified. 2906 */ 2907 ndisc_ops_prefix_rcv_add_addr(net, dev, pinfo, in6_dev, &addr, 2908 addr_type, addr_flags, sllao, 2909 tokenized, valid_lft, 2910 prefered_lft, 2911 dev_addr_generated); 2912 } 2913 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo); 2914put: 2915 in6_dev_put(in6_dev); 2916} 2917 2918static int addrconf_set_sit_dstaddr(struct net *net, struct net_device *dev, 2919 struct in6_ifreq *ireq) 2920{ 2921 struct ip_tunnel_parm p = { }; 2922 int err; 2923 2924 if (!(ipv6_addr_type(&ireq->ifr6_addr) & IPV6_ADDR_COMPATv4)) 2925 return -EADDRNOTAVAIL; 2926 2927 p.iph.daddr = ireq->ifr6_addr.s6_addr32[3]; 2928 p.iph.version = 4; 2929 p.iph.ihl = 5; 2930 p.iph.protocol = IPPROTO_IPV6; 2931 p.iph.ttl = 64; 2932 2933 if (!dev->netdev_ops->ndo_tunnel_ctl) 2934 return -EOPNOTSUPP; 2935 err = dev->netdev_ops->ndo_tunnel_ctl(dev, &p, SIOCADDTUNNEL); 2936 if (err) 2937 return err; 2938 2939 dev = __dev_get_by_name(net, p.name); 2940 if (!dev) 2941 return -ENOBUFS; 2942 return dev_open(dev, NULL); 2943} 2944 2945/* 2946 * Set destination address. 2947 * Special case for SIT interfaces where we create a new "virtual" 2948 * device. 2949 */ 2950int addrconf_set_dstaddr(struct net *net, void __user *arg) 2951{ 2952 struct net_device *dev; 2953 struct in6_ifreq ireq; 2954 int err = -ENODEV; 2955 2956 if (!IS_ENABLED(CONFIG_IPV6_SIT)) 2957 return -ENODEV; 2958 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2959 return -EFAULT; 2960 2961 rtnl_lock(); 2962 dev = __dev_get_by_index(net, ireq.ifr6_ifindex); 2963 if (dev && dev->type == ARPHRD_SIT) 2964 err = addrconf_set_sit_dstaddr(net, dev, &ireq); 2965 rtnl_unlock(); 2966 return err; 2967} 2968 2969static int ipv6_mc_config(struct sock *sk, bool join, 2970 const struct in6_addr *addr, int ifindex) 2971{ 2972 int ret; 2973 2974 ASSERT_RTNL(); 2975 2976 lock_sock(sk); 2977 if (join) 2978 ret = ipv6_sock_mc_join(sk, ifindex, addr); 2979 else 2980 ret = ipv6_sock_mc_drop(sk, ifindex, addr); 2981 release_sock(sk); 2982 2983 return ret; 2984} 2985 2986/* 2987 * Manual configuration of address on an interface 2988 */ 2989static int inet6_addr_add(struct net *net, int ifindex, 2990 struct ifa6_config *cfg, 2991 struct netlink_ext_ack *extack) 2992{ 2993 struct inet6_ifaddr *ifp; 2994 struct inet6_dev *idev; 2995 struct net_device *dev; 2996 unsigned long timeout; 2997 clock_t expires; 2998 u32 flags; 2999 3000 ASSERT_RTNL(); 3001 3002 if (cfg->plen > 128) { 3003 NL_SET_ERR_MSG_MOD(extack, "Invalid prefix length"); 3004 return -EINVAL; 3005 } 3006 3007 /* check the lifetime */ 3008 if (!cfg->valid_lft || cfg->preferred_lft > cfg->valid_lft) { 3009 NL_SET_ERR_MSG_MOD(extack, "address lifetime invalid"); 3010 return -EINVAL; 3011 } 3012 3013 if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR && cfg->plen != 64) { 3014 NL_SET_ERR_MSG_MOD(extack, "address with \"mngtmpaddr\" flag must have a prefix length of 64"); 3015 return -EINVAL; 3016 } 3017 3018 dev = __dev_get_by_index(net, ifindex); 3019 if (!dev) 3020 return -ENODEV; 3021 3022 idev = addrconf_add_dev(dev); 3023 if (IS_ERR(idev)) { 3024 NL_SET_ERR_MSG_MOD(extack, "IPv6 is disabled on this device"); 3025 return PTR_ERR(idev); 3026 } 3027 3028 if (cfg->ifa_flags & IFA_F_MCAUTOJOIN) { 3029 int ret = ipv6_mc_config(net->ipv6.mc_autojoin_sk, 3030 true, cfg->pfx, ifindex); 3031 3032 if (ret < 0) { 3033 NL_SET_ERR_MSG_MOD(extack, "Multicast auto join failed"); 3034 return ret; 3035 } 3036 } 3037 3038 cfg->scope = ipv6_addr_scope(cfg->pfx); 3039 3040 timeout = addrconf_timeout_fixup(cfg->valid_lft, HZ); 3041 if (addrconf_finite_timeout(timeout)) { 3042 expires = jiffies_to_clock_t(timeout * HZ); 3043 cfg->valid_lft = timeout; 3044 flags = RTF_EXPIRES; 3045 } else { 3046 expires = 0; 3047 flags = 0; 3048 cfg->ifa_flags |= IFA_F_PERMANENT; 3049 } 3050 3051 timeout = addrconf_timeout_fixup(cfg->preferred_lft, HZ); 3052 if (addrconf_finite_timeout(timeout)) { 3053 if (timeout == 0) 3054 cfg->ifa_flags |= IFA_F_DEPRECATED; 3055 cfg->preferred_lft = timeout; 3056 } 3057 3058 ifp = ipv6_add_addr(idev, cfg, true, extack); 3059 if (!IS_ERR(ifp)) { 3060 if (!(cfg->ifa_flags & IFA_F_NOPREFIXROUTE)) { 3061 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, 3062 ifp->rt_priority, dev, expires, 3063 flags, GFP_KERNEL); 3064 } 3065 3066 /* Send a netlink notification if DAD is enabled and 3067 * optimistic flag is not set 3068 */ 3069 if (!(ifp->flags & (IFA_F_OPTIMISTIC | IFA_F_NODAD))) 3070 ipv6_ifa_notify(0, ifp); 3071 /* 3072 * Note that section 3.1 of RFC 4429 indicates 3073 * that the Optimistic flag should not be set for 3074 * manually configured addresses 3075 */ 3076 addrconf_dad_start(ifp); 3077 if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR) 3078 manage_tempaddrs(idev, ifp, cfg->valid_lft, 3079 cfg->preferred_lft, true, jiffies); 3080 in6_ifa_put(ifp); 3081 addrconf_verify_rtnl(net); 3082 return 0; 3083 } else if (cfg->ifa_flags & IFA_F_MCAUTOJOIN) { 3084 ipv6_mc_config(net->ipv6.mc_autojoin_sk, false, 3085 cfg->pfx, ifindex); 3086 } 3087 3088 return PTR_ERR(ifp); 3089} 3090 3091static int inet6_addr_del(struct net *net, int ifindex, u32 ifa_flags, 3092 const struct in6_addr *pfx, unsigned int plen, 3093 struct netlink_ext_ack *extack) 3094{ 3095 struct inet6_ifaddr *ifp; 3096 struct inet6_dev *idev; 3097 struct net_device *dev; 3098 3099 if (plen > 128) { 3100 NL_SET_ERR_MSG_MOD(extack, "Invalid prefix length"); 3101 return -EINVAL; 3102 } 3103 3104 dev = __dev_get_by_index(net, ifindex); 3105 if (!dev) { 3106 NL_SET_ERR_MSG_MOD(extack, "Unable to find the interface"); 3107 return -ENODEV; 3108 } 3109 3110 idev = __in6_dev_get(dev); 3111 if (!idev) { 3112 NL_SET_ERR_MSG_MOD(extack, "IPv6 is disabled on this device"); 3113 return -ENXIO; 3114 } 3115 3116 read_lock_bh(&idev->lock); 3117 list_for_each_entry(ifp, &idev->addr_list, if_list) { 3118 if (ifp->prefix_len == plen && 3119 ipv6_addr_equal(pfx, &ifp->addr)) { 3120 in6_ifa_hold(ifp); 3121 read_unlock_bh(&idev->lock); 3122 3123 if (!(ifp->flags & IFA_F_TEMPORARY) && 3124 (ifa_flags & IFA_F_MANAGETEMPADDR)) 3125 manage_tempaddrs(idev, ifp, 0, 0, false, 3126 jiffies); 3127 ipv6_del_addr(ifp); 3128 addrconf_verify_rtnl(net); 3129 if (ipv6_addr_is_multicast(pfx)) { 3130 ipv6_mc_config(net->ipv6.mc_autojoin_sk, 3131 false, pfx, dev->ifindex); 3132 } 3133 return 0; 3134 } 3135 } 3136 read_unlock_bh(&idev->lock); 3137 3138 NL_SET_ERR_MSG_MOD(extack, "address not found"); 3139 return -EADDRNOTAVAIL; 3140} 3141 3142 3143int addrconf_add_ifaddr(struct net *net, void __user *arg) 3144{ 3145 struct ifa6_config cfg = { 3146 .ifa_flags = IFA_F_PERMANENT, 3147 .preferred_lft = INFINITY_LIFE_TIME, 3148 .valid_lft = INFINITY_LIFE_TIME, 3149 }; 3150 struct in6_ifreq ireq; 3151 int err; 3152 3153 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 3154 return -EPERM; 3155 3156 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 3157 return -EFAULT; 3158 3159 cfg.pfx = &ireq.ifr6_addr; 3160 cfg.plen = ireq.ifr6_prefixlen; 3161 3162 rtnl_lock(); 3163 err = inet6_addr_add(net, ireq.ifr6_ifindex, &cfg, NULL); 3164 rtnl_unlock(); 3165 return err; 3166} 3167 3168int addrconf_del_ifaddr(struct net *net, void __user *arg) 3169{ 3170 struct in6_ifreq ireq; 3171 int err; 3172 3173 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 3174 return -EPERM; 3175 3176 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 3177 return -EFAULT; 3178 3179 rtnl_lock(); 3180 err = inet6_addr_del(net, ireq.ifr6_ifindex, 0, &ireq.ifr6_addr, 3181 ireq.ifr6_prefixlen, NULL); 3182 rtnl_unlock(); 3183 return err; 3184} 3185 3186static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr, 3187 int plen, int scope, u8 proto) 3188{ 3189 struct inet6_ifaddr *ifp; 3190 struct ifa6_config cfg = { 3191 .pfx = addr, 3192 .plen = plen, 3193 .ifa_flags = IFA_F_PERMANENT, 3194 .valid_lft = INFINITY_LIFE_TIME, 3195 .preferred_lft = INFINITY_LIFE_TIME, 3196 .scope = scope, 3197 .ifa_proto = proto 3198 }; 3199 3200 ifp = ipv6_add_addr(idev, &cfg, true, NULL); 3201 if (!IS_ERR(ifp)) { 3202 spin_lock_bh(&ifp->lock); 3203 ifp->flags &= ~IFA_F_TENTATIVE; 3204 spin_unlock_bh(&ifp->lock); 3205 rt_genid_bump_ipv6(dev_net(idev->dev)); 3206 ipv6_ifa_notify(RTM_NEWADDR, ifp); 3207 in6_ifa_put(ifp); 3208 } 3209} 3210 3211#if IS_ENABLED(CONFIG_IPV6_SIT) || IS_ENABLED(CONFIG_NET_IPGRE) || IS_ENABLED(CONFIG_IPV6_GRE) 3212static void add_v4_addrs(struct inet6_dev *idev) 3213{ 3214 struct in6_addr addr; 3215 struct net_device *dev; 3216 struct net *net = dev_net(idev->dev); 3217 int scope, plen, offset = 0; 3218 u32 pflags = 0; 3219 3220 ASSERT_RTNL(); 3221 3222 memset(&addr, 0, sizeof(struct in6_addr)); 3223 /* in case of IP6GRE the dev_addr is an IPv6 and therefore we use only the last 4 bytes */ 3224 if (idev->dev->addr_len == sizeof(struct in6_addr)) 3225 offset = sizeof(struct in6_addr) - 4; 3226 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr + offset, 4); 3227 3228 if (!(idev->dev->flags & IFF_POINTOPOINT) && idev->dev->type == ARPHRD_SIT) { 3229 scope = IPV6_ADDR_COMPATv4; 3230 plen = 96; 3231 pflags |= RTF_NONEXTHOP; 3232 } else { 3233 if (idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_NONE) 3234 return; 3235 3236 addr.s6_addr32[0] = htonl(0xfe800000); 3237 scope = IFA_LINK; 3238 plen = 64; 3239 } 3240 3241 if (addr.s6_addr32[3]) { 3242 add_addr(idev, &addr, plen, scope, IFAPROT_UNSPEC); 3243 addrconf_prefix_route(&addr, plen, 0, idev->dev, 0, pflags, 3244 GFP_KERNEL); 3245 return; 3246 } 3247 3248 for_each_netdev(net, dev) { 3249 struct in_device *in_dev = __in_dev_get_rtnl(dev); 3250 if (in_dev && (dev->flags & IFF_UP)) { 3251 struct in_ifaddr *ifa; 3252 int flag = scope; 3253 3254 in_dev_for_each_ifa_rtnl(ifa, in_dev) { 3255 addr.s6_addr32[3] = ifa->ifa_local; 3256 3257 if (ifa->ifa_scope == RT_SCOPE_LINK) 3258 continue; 3259 if (ifa->ifa_scope >= RT_SCOPE_HOST) { 3260 if (idev->dev->flags&IFF_POINTOPOINT) 3261 continue; 3262 flag |= IFA_HOST; 3263 } 3264 3265 add_addr(idev, &addr, plen, flag, 3266 IFAPROT_UNSPEC); 3267 addrconf_prefix_route(&addr, plen, 0, idev->dev, 3268 0, pflags, GFP_KERNEL); 3269 } 3270 } 3271 } 3272} 3273#endif 3274 3275static void init_loopback(struct net_device *dev) 3276{ 3277 struct inet6_dev *idev; 3278 3279 /* ::1 */ 3280 3281 ASSERT_RTNL(); 3282 3283 idev = ipv6_find_idev(dev); 3284 if (IS_ERR(idev)) { 3285 pr_debug("%s: add_dev failed\n", __func__); 3286 return; 3287 } 3288 3289 add_addr(idev, &in6addr_loopback, 128, IFA_HOST, IFAPROT_KERNEL_LO); 3290} 3291 3292void addrconf_add_linklocal(struct inet6_dev *idev, 3293 const struct in6_addr *addr, u32 flags) 3294{ 3295 struct ifa6_config cfg = { 3296 .pfx = addr, 3297 .plen = 64, 3298 .ifa_flags = flags | IFA_F_PERMANENT, 3299 .valid_lft = INFINITY_LIFE_TIME, 3300 .preferred_lft = INFINITY_LIFE_TIME, 3301 .scope = IFA_LINK, 3302 .ifa_proto = IFAPROT_KERNEL_LL 3303 }; 3304 struct inet6_ifaddr *ifp; 3305 3306#ifdef CONFIG_IPV6_OPTIMISTIC_DAD 3307 if ((READ_ONCE(dev_net(idev->dev)->ipv6.devconf_all->optimistic_dad) || 3308 READ_ONCE(idev->cnf.optimistic_dad)) && 3309 !dev_net(idev->dev)->ipv6.devconf_all->forwarding) 3310 cfg.ifa_flags |= IFA_F_OPTIMISTIC; 3311#endif 3312 3313 ifp = ipv6_add_addr(idev, &cfg, true, NULL); 3314 if (!IS_ERR(ifp)) { 3315 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, 0, idev->dev, 3316 0, 0, GFP_ATOMIC); 3317 addrconf_dad_start(ifp); 3318 in6_ifa_put(ifp); 3319 } 3320} 3321EXPORT_SYMBOL_GPL(addrconf_add_linklocal); 3322 3323static bool ipv6_reserved_interfaceid(struct in6_addr address) 3324{ 3325 if ((address.s6_addr32[2] | address.s6_addr32[3]) == 0) 3326 return true; 3327 3328 if (address.s6_addr32[2] == htonl(0x02005eff) && 3329 ((address.s6_addr32[3] & htonl(0xfe000000)) == htonl(0xfe000000))) 3330 return true; 3331 3332 if (address.s6_addr32[2] == htonl(0xfdffffff) && 3333 ((address.s6_addr32[3] & htonl(0xffffff80)) == htonl(0xffffff80))) 3334 return true; 3335 3336 return false; 3337} 3338 3339static int ipv6_generate_stable_address(struct in6_addr *address, 3340 u8 dad_count, 3341 const struct inet6_dev *idev) 3342{ 3343 static DEFINE_SPINLOCK(lock); 3344 static __u32 digest[SHA1_DIGEST_WORDS]; 3345 static __u32 workspace[SHA1_WORKSPACE_WORDS]; 3346 3347 static union { 3348 char __data[SHA1_BLOCK_SIZE]; 3349 struct { 3350 struct in6_addr secret; 3351 __be32 prefix[2]; 3352 unsigned char hwaddr[MAX_ADDR_LEN]; 3353 u8 dad_count; 3354 } __packed; 3355 } data; 3356 3357 struct in6_addr secret; 3358 struct in6_addr temp; 3359 struct net *net = dev_net(idev->dev); 3360 3361 BUILD_BUG_ON(sizeof(data.__data) != sizeof(data)); 3362 3363 if (idev->cnf.stable_secret.initialized) 3364 secret = idev->cnf.stable_secret.secret; 3365 else if (net->ipv6.devconf_dflt->stable_secret.initialized) 3366 secret = net->ipv6.devconf_dflt->stable_secret.secret; 3367 else 3368 return -1; 3369 3370retry: 3371 spin_lock_bh(&lock); 3372 3373 sha1_init(digest); 3374 memset(&data, 0, sizeof(data)); 3375 memset(workspace, 0, sizeof(workspace)); 3376 memcpy(data.hwaddr, idev->dev->perm_addr, idev->dev->addr_len); 3377 data.prefix[0] = address->s6_addr32[0]; 3378 data.prefix[1] = address->s6_addr32[1]; 3379 data.secret = secret; 3380 data.dad_count = dad_count; 3381 3382 sha1_transform(digest, data.__data, workspace); 3383 3384 temp = *address; 3385 temp.s6_addr32[2] = (__force __be32)digest[0]; 3386 temp.s6_addr32[3] = (__force __be32)digest[1]; 3387 3388 spin_unlock_bh(&lock); 3389 3390 if (ipv6_reserved_interfaceid(temp)) { 3391 dad_count++; 3392 if (dad_count > dev_net(idev->dev)->ipv6.sysctl.idgen_retries) 3393 return -1; 3394 goto retry; 3395 } 3396 3397 *address = temp; 3398 return 0; 3399} 3400 3401static void ipv6_gen_mode_random_init(struct inet6_dev *idev) 3402{ 3403 struct ipv6_stable_secret *s = &idev->cnf.stable_secret; 3404 3405 if (s->initialized) 3406 return; 3407 s = &idev->cnf.stable_secret; 3408 get_random_bytes(&s->secret, sizeof(s->secret)); 3409 s->initialized = true; 3410} 3411 3412static void addrconf_addr_gen(struct inet6_dev *idev, bool prefix_route) 3413{ 3414 struct in6_addr addr; 3415 3416 /* no link local addresses on L3 master devices */ 3417 if (netif_is_l3_master(idev->dev)) 3418 return; 3419 3420 /* no link local addresses on devices flagged as slaves */ 3421 if (idev->dev->priv_flags & IFF_NO_ADDRCONF) 3422 return; 3423 3424 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0); 3425 3426 switch (idev->cnf.addr_gen_mode) { 3427 case IN6_ADDR_GEN_MODE_RANDOM: 3428 ipv6_gen_mode_random_init(idev); 3429 fallthrough; 3430 case IN6_ADDR_GEN_MODE_STABLE_PRIVACY: 3431 if (!ipv6_generate_stable_address(&addr, 0, idev)) 3432 addrconf_add_linklocal(idev, &addr, 3433 IFA_F_STABLE_PRIVACY); 3434 else if (prefix_route) 3435 addrconf_prefix_route(&addr, 64, 0, idev->dev, 3436 0, 0, GFP_KERNEL); 3437 break; 3438 case IN6_ADDR_GEN_MODE_EUI64: 3439 /* addrconf_add_linklocal also adds a prefix_route and we 3440 * only need to care about prefix routes if ipv6_generate_eui64 3441 * couldn't generate one. 3442 */ 3443 if (ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) == 0) 3444 addrconf_add_linklocal(idev, &addr, 0); 3445 else if (prefix_route) 3446 addrconf_prefix_route(&addr, 64, 0, idev->dev, 3447 0, 0, GFP_KERNEL); 3448 break; 3449 case IN6_ADDR_GEN_MODE_NONE: 3450 default: 3451 /* will not add any link local address */ 3452 break; 3453 } 3454} 3455 3456static void addrconf_dev_config(struct net_device *dev) 3457{ 3458 struct inet6_dev *idev; 3459 3460 ASSERT_RTNL(); 3461 3462 if ((dev->type != ARPHRD_ETHER) && 3463 (dev->type != ARPHRD_FDDI) && 3464 (dev->type != ARPHRD_ARCNET) && 3465 (dev->type != ARPHRD_INFINIBAND) && 3466 (dev->type != ARPHRD_IEEE1394) && 3467 (dev->type != ARPHRD_TUNNEL6) && 3468 (dev->type != ARPHRD_6LOWPAN) && 3469 (dev->type != ARPHRD_TUNNEL) && 3470 (dev->type != ARPHRD_NONE) && 3471 (dev->type != ARPHRD_RAWIP)) { 3472 /* Alas, we support only Ethernet autoconfiguration. */ 3473 idev = __in6_dev_get(dev); 3474 if (!IS_ERR_OR_NULL(idev) && dev->flags & IFF_UP && 3475 dev->flags & IFF_MULTICAST) 3476 ipv6_mc_up(idev); 3477 return; 3478 } 3479 3480 idev = addrconf_add_dev(dev); 3481 if (IS_ERR(idev)) 3482 return; 3483 3484 /* this device type has no EUI support */ 3485 if (dev->type == ARPHRD_NONE && 3486 idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_EUI64) 3487 WRITE_ONCE(idev->cnf.addr_gen_mode, 3488 IN6_ADDR_GEN_MODE_RANDOM); 3489 3490 addrconf_addr_gen(idev, false); 3491} 3492 3493#if IS_ENABLED(CONFIG_IPV6_SIT) 3494static void addrconf_sit_config(struct net_device *dev) 3495{ 3496 struct inet6_dev *idev; 3497 3498 ASSERT_RTNL(); 3499 3500 /* 3501 * Configure the tunnel with one of our IPv4 3502 * addresses... we should configure all of 3503 * our v4 addrs in the tunnel 3504 */ 3505 3506 idev = ipv6_find_idev(dev); 3507 if (IS_ERR(idev)) { 3508 pr_debug("%s: add_dev failed\n", __func__); 3509 return; 3510 } 3511 3512 if (dev->priv_flags & IFF_ISATAP) { 3513 addrconf_addr_gen(idev, false); 3514 return; 3515 } 3516 3517 add_v4_addrs(idev); 3518 3519 if (dev->flags&IFF_POINTOPOINT) 3520 addrconf_add_mroute(dev); 3521} 3522#endif 3523 3524#if IS_ENABLED(CONFIG_NET_IPGRE) || IS_ENABLED(CONFIG_IPV6_GRE) 3525static void addrconf_gre_config(struct net_device *dev) 3526{ 3527 struct inet6_dev *idev; 3528 3529 ASSERT_RTNL(); 3530 3531 idev = ipv6_find_idev(dev); 3532 if (IS_ERR(idev)) { 3533 pr_debug("%s: add_dev failed\n", __func__); 3534 return; 3535 } 3536 3537 if (dev->type == ARPHRD_ETHER) { 3538 addrconf_addr_gen(idev, true); 3539 return; 3540 } 3541 3542 add_v4_addrs(idev); 3543 3544 if (dev->flags & IFF_POINTOPOINT) 3545 addrconf_add_mroute(dev); 3546} 3547#endif 3548 3549static void addrconf_init_auto_addrs(struct net_device *dev) 3550{ 3551 switch (dev->type) { 3552#if IS_ENABLED(CONFIG_IPV6_SIT) 3553 case ARPHRD_SIT: 3554 addrconf_sit_config(dev); 3555 break; 3556#endif 3557#if IS_ENABLED(CONFIG_NET_IPGRE) || IS_ENABLED(CONFIG_IPV6_GRE) 3558 case ARPHRD_IP6GRE: 3559 case ARPHRD_IPGRE: 3560 addrconf_gre_config(dev); 3561 break; 3562#endif 3563 case ARPHRD_LOOPBACK: 3564 init_loopback(dev); 3565 break; 3566 3567 default: 3568 addrconf_dev_config(dev); 3569 break; 3570 } 3571} 3572 3573static int fixup_permanent_addr(struct net *net, 3574 struct inet6_dev *idev, 3575 struct inet6_ifaddr *ifp) 3576{ 3577 /* !fib6_node means the host route was removed from the 3578 * FIB, for example, if 'lo' device is taken down. In that 3579 * case regenerate the host route. 3580 */ 3581 if (!ifp->rt || !ifp->rt->fib6_node) { 3582 struct fib6_info *f6i, *prev; 3583 3584 f6i = addrconf_f6i_alloc(net, idev, &ifp->addr, false, 3585 GFP_ATOMIC, NULL); 3586 if (IS_ERR(f6i)) 3587 return PTR_ERR(f6i); 3588 3589 /* ifp->rt can be accessed outside of rtnl */ 3590 spin_lock(&ifp->lock); 3591 prev = ifp->rt; 3592 ifp->rt = f6i; 3593 spin_unlock(&ifp->lock); 3594 3595 fib6_info_release(prev); 3596 } 3597 3598 if (!(ifp->flags & IFA_F_NOPREFIXROUTE)) { 3599 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, 3600 ifp->rt_priority, idev->dev, 0, 0, 3601 GFP_ATOMIC); 3602 } 3603 3604 if (ifp->state == INET6_IFADDR_STATE_PREDAD) 3605 addrconf_dad_start(ifp); 3606 3607 return 0; 3608} 3609 3610static void addrconf_permanent_addr(struct net *net, struct net_device *dev) 3611{ 3612 struct inet6_ifaddr *ifp, *tmp; 3613 struct inet6_dev *idev; 3614 3615 idev = __in6_dev_get(dev); 3616 if (!idev) 3617 return; 3618 3619 write_lock_bh(&idev->lock); 3620 3621 list_for_each_entry_safe(ifp, tmp, &idev->addr_list, if_list) { 3622 if ((ifp->flags & IFA_F_PERMANENT) && 3623 fixup_permanent_addr(net, idev, ifp) < 0) { 3624 write_unlock_bh(&idev->lock); 3625 in6_ifa_hold(ifp); 3626 ipv6_del_addr(ifp); 3627 write_lock_bh(&idev->lock); 3628 3629 net_info_ratelimited("%s: Failed to add prefix route for address %pI6c; dropping\n", 3630 idev->dev->name, &ifp->addr); 3631 } 3632 } 3633 3634 write_unlock_bh(&idev->lock); 3635} 3636 3637static int addrconf_notify(struct notifier_block *this, unsigned long event, 3638 void *ptr) 3639{ 3640 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 3641 struct netdev_notifier_change_info *change_info; 3642 struct netdev_notifier_changeupper_info *info; 3643 struct inet6_dev *idev = __in6_dev_get(dev); 3644 struct net *net = dev_net(dev); 3645 int run_pending = 0; 3646 int err; 3647 3648 switch (event) { 3649 case NETDEV_REGISTER: 3650 if (!idev && dev->mtu >= IPV6_MIN_MTU) { 3651 idev = ipv6_add_dev(dev); 3652 if (IS_ERR(idev)) 3653 return notifier_from_errno(PTR_ERR(idev)); 3654 } 3655 break; 3656 3657 case NETDEV_CHANGEMTU: 3658 /* if MTU under IPV6_MIN_MTU stop IPv6 on this interface. */ 3659 if (dev->mtu < IPV6_MIN_MTU) { 3660 addrconf_ifdown(dev, dev != net->loopback_dev); 3661 break; 3662 } 3663 3664 if (idev) { 3665 rt6_mtu_change(dev, dev->mtu); 3666 WRITE_ONCE(idev->cnf.mtu6, dev->mtu); 3667 break; 3668 } 3669 3670 /* allocate new idev */ 3671 idev = ipv6_add_dev(dev); 3672 if (IS_ERR(idev)) 3673 break; 3674 3675 /* device is still not ready */ 3676 if (!(idev->if_flags & IF_READY)) 3677 break; 3678 3679 run_pending = 1; 3680 fallthrough; 3681 case NETDEV_UP: 3682 case NETDEV_CHANGE: 3683 if (idev && idev->cnf.disable_ipv6) 3684 break; 3685 3686 if (dev->priv_flags & IFF_NO_ADDRCONF) { 3687 if (event == NETDEV_UP && !IS_ERR_OR_NULL(idev) && 3688 dev->flags & IFF_UP && dev->flags & IFF_MULTICAST) 3689 ipv6_mc_up(idev); 3690 break; 3691 } 3692 3693 if (event == NETDEV_UP) { 3694 /* restore routes for permanent addresses */ 3695 addrconf_permanent_addr(net, dev); 3696 3697 if (!addrconf_link_ready(dev)) { 3698 /* device is not ready yet. */ 3699 pr_debug("ADDRCONF(NETDEV_UP): %s: link is not ready\n", 3700 dev->name); 3701 break; 3702 } 3703 3704 if (!idev && dev->mtu >= IPV6_MIN_MTU) 3705 idev = ipv6_add_dev(dev); 3706 3707 if (!IS_ERR_OR_NULL(idev)) { 3708 idev->if_flags |= IF_READY; 3709 run_pending = 1; 3710 } 3711 } else if (event == NETDEV_CHANGE) { 3712 if (!addrconf_link_ready(dev)) { 3713 /* device is still not ready. */ 3714 rt6_sync_down_dev(dev, event); 3715 break; 3716 } 3717 3718 if (!IS_ERR_OR_NULL(idev)) { 3719 if (idev->if_flags & IF_READY) { 3720 /* device is already configured - 3721 * but resend MLD reports, we might 3722 * have roamed and need to update 3723 * multicast snooping switches 3724 */ 3725 ipv6_mc_up(idev); 3726 change_info = ptr; 3727 if (change_info->flags_changed & IFF_NOARP) 3728 addrconf_dad_run(idev, true); 3729 rt6_sync_up(dev, RTNH_F_LINKDOWN); 3730 break; 3731 } 3732 idev->if_flags |= IF_READY; 3733 } 3734 3735 pr_debug("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n", 3736 dev->name); 3737 3738 run_pending = 1; 3739 } 3740 3741 addrconf_init_auto_addrs(dev); 3742 3743 if (!IS_ERR_OR_NULL(idev)) { 3744 if (run_pending) 3745 addrconf_dad_run(idev, false); 3746 3747 /* Device has an address by now */ 3748 rt6_sync_up(dev, RTNH_F_DEAD); 3749 3750 /* 3751 * If the MTU changed during the interface down, 3752 * when the interface up, the changed MTU must be 3753 * reflected in the idev as well as routers. 3754 */ 3755 if (idev->cnf.mtu6 != dev->mtu && 3756 dev->mtu >= IPV6_MIN_MTU) { 3757 rt6_mtu_change(dev, dev->mtu); 3758 WRITE_ONCE(idev->cnf.mtu6, dev->mtu); 3759 } 3760 WRITE_ONCE(idev->tstamp, jiffies); 3761 inet6_ifinfo_notify(RTM_NEWLINK, idev); 3762 3763 /* 3764 * If the changed mtu during down is lower than 3765 * IPV6_MIN_MTU stop IPv6 on this interface. 3766 */ 3767 if (dev->mtu < IPV6_MIN_MTU) 3768 addrconf_ifdown(dev, dev != net->loopback_dev); 3769 } 3770 break; 3771 3772 case NETDEV_DOWN: 3773 case NETDEV_UNREGISTER: 3774 /* 3775 * Remove all addresses from this interface. 3776 */ 3777 addrconf_ifdown(dev, event != NETDEV_DOWN); 3778 break; 3779 3780 case NETDEV_CHANGENAME: 3781 if (idev) { 3782 snmp6_unregister_dev(idev); 3783 addrconf_sysctl_unregister(idev); 3784 err = addrconf_sysctl_register(idev); 3785 if (err) 3786 return notifier_from_errno(err); 3787 err = snmp6_register_dev(idev); 3788 if (err) { 3789 addrconf_sysctl_unregister(idev); 3790 return notifier_from_errno(err); 3791 } 3792 } 3793 break; 3794 3795 case NETDEV_PRE_TYPE_CHANGE: 3796 case NETDEV_POST_TYPE_CHANGE: 3797 if (idev) 3798 addrconf_type_change(dev, event); 3799 break; 3800 3801 case NETDEV_CHANGEUPPER: 3802 info = ptr; 3803 3804 /* flush all routes if dev is linked to or unlinked from 3805 * an L3 master device (e.g., VRF) 3806 */ 3807 if (info->upper_dev && netif_is_l3_master(info->upper_dev)) 3808 addrconf_ifdown(dev, false); 3809 } 3810 3811 return NOTIFY_OK; 3812} 3813 3814/* 3815 * addrconf module should be notified of a device going up 3816 */ 3817static struct notifier_block ipv6_dev_notf = { 3818 .notifier_call = addrconf_notify, 3819 .priority = ADDRCONF_NOTIFY_PRIORITY, 3820}; 3821 3822static void addrconf_type_change(struct net_device *dev, unsigned long event) 3823{ 3824 struct inet6_dev *idev; 3825 ASSERT_RTNL(); 3826 3827 idev = __in6_dev_get(dev); 3828 3829 if (event == NETDEV_POST_TYPE_CHANGE) 3830 ipv6_mc_remap(idev); 3831 else if (event == NETDEV_PRE_TYPE_CHANGE) 3832 ipv6_mc_unmap(idev); 3833} 3834 3835static bool addr_is_local(const struct in6_addr *addr) 3836{ 3837 return ipv6_addr_type(addr) & 3838 (IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK); 3839} 3840 3841static int addrconf_ifdown(struct net_device *dev, bool unregister) 3842{ 3843 unsigned long event = unregister ? NETDEV_UNREGISTER : NETDEV_DOWN; 3844 struct net *net = dev_net(dev); 3845 struct inet6_dev *idev; 3846 struct inet6_ifaddr *ifa; 3847 LIST_HEAD(tmp_addr_list); 3848 bool keep_addr = false; 3849 bool was_ready; 3850 int state, i; 3851 3852 ASSERT_RTNL(); 3853 3854 rt6_disable_ip(dev, event); 3855 3856 idev = __in6_dev_get(dev); 3857 if (!idev) 3858 return -ENODEV; 3859 3860 /* 3861 * Step 1: remove reference to ipv6 device from parent device. 3862 * Do not dev_put! 3863 */ 3864 if (unregister) { 3865 idev->dead = 1; 3866 3867 /* protected by rtnl_lock */ 3868 RCU_INIT_POINTER(dev->ip6_ptr, NULL); 3869 3870 /* Step 1.5: remove snmp6 entry */ 3871 snmp6_unregister_dev(idev); 3872 3873 } 3874 3875 /* combine the user config with event to determine if permanent 3876 * addresses are to be removed from address hash table 3877 */ 3878 if (!unregister && !idev->cnf.disable_ipv6) { 3879 /* aggregate the system setting and interface setting */ 3880 int _keep_addr = READ_ONCE(net->ipv6.devconf_all->keep_addr_on_down); 3881 3882 if (!_keep_addr) 3883 _keep_addr = READ_ONCE(idev->cnf.keep_addr_on_down); 3884 3885 keep_addr = (_keep_addr > 0); 3886 } 3887 3888 /* Step 2: clear hash table */ 3889 for (i = 0; i < IN6_ADDR_HSIZE; i++) { 3890 struct hlist_head *h = &net->ipv6.inet6_addr_lst[i]; 3891 3892 spin_lock_bh(&net->ipv6.addrconf_hash_lock); 3893restart: 3894 hlist_for_each_entry_rcu(ifa, h, addr_lst) { 3895 if (ifa->idev == idev) { 3896 addrconf_del_dad_work(ifa); 3897 /* combined flag + permanent flag decide if 3898 * address is retained on a down event 3899 */ 3900 if (!keep_addr || 3901 !(ifa->flags & IFA_F_PERMANENT) || 3902 addr_is_local(&ifa->addr)) { 3903 hlist_del_init_rcu(&ifa->addr_lst); 3904 goto restart; 3905 } 3906 } 3907 } 3908 spin_unlock_bh(&net->ipv6.addrconf_hash_lock); 3909 } 3910 3911 write_lock_bh(&idev->lock); 3912 3913 addrconf_del_rs_timer(idev); 3914 3915 /* Step 2: clear flags for stateless addrconf, repeated down 3916 * detection 3917 */ 3918 was_ready = idev->if_flags & IF_READY; 3919 if (!unregister) 3920 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY); 3921 3922 /* Step 3: clear tempaddr list */ 3923 while (!list_empty(&idev->tempaddr_list)) { 3924 ifa = list_first_entry(&idev->tempaddr_list, 3925 struct inet6_ifaddr, tmp_list); 3926 list_del(&ifa->tmp_list); 3927 write_unlock_bh(&idev->lock); 3928 spin_lock_bh(&ifa->lock); 3929 3930 if (ifa->ifpub) { 3931 in6_ifa_put(ifa->ifpub); 3932 ifa->ifpub = NULL; 3933 } 3934 spin_unlock_bh(&ifa->lock); 3935 in6_ifa_put(ifa); 3936 write_lock_bh(&idev->lock); 3937 } 3938 3939 list_for_each_entry(ifa, &idev->addr_list, if_list) 3940 list_add_tail(&ifa->if_list_aux, &tmp_addr_list); 3941 write_unlock_bh(&idev->lock); 3942 3943 while (!list_empty(&tmp_addr_list)) { 3944 struct fib6_info *rt = NULL; 3945 bool keep; 3946 3947 ifa = list_first_entry(&tmp_addr_list, 3948 struct inet6_ifaddr, if_list_aux); 3949 list_del(&ifa->if_list_aux); 3950 3951 addrconf_del_dad_work(ifa); 3952 3953 keep = keep_addr && (ifa->flags & IFA_F_PERMANENT) && 3954 !addr_is_local(&ifa->addr); 3955 3956 spin_lock_bh(&ifa->lock); 3957 3958 if (keep) { 3959 /* set state to skip the notifier below */ 3960 state = INET6_IFADDR_STATE_DEAD; 3961 ifa->state = INET6_IFADDR_STATE_PREDAD; 3962 if (!(ifa->flags & IFA_F_NODAD)) 3963 ifa->flags |= IFA_F_TENTATIVE; 3964 3965 rt = ifa->rt; 3966 ifa->rt = NULL; 3967 } else { 3968 state = ifa->state; 3969 ifa->state = INET6_IFADDR_STATE_DEAD; 3970 } 3971 3972 spin_unlock_bh(&ifa->lock); 3973 3974 if (rt) 3975 ip6_del_rt(net, rt, false); 3976 3977 if (state != INET6_IFADDR_STATE_DEAD) { 3978 __ipv6_ifa_notify(RTM_DELADDR, ifa); 3979 inet6addr_notifier_call_chain(NETDEV_DOWN, ifa); 3980 } else { 3981 if (idev->cnf.forwarding) 3982 addrconf_leave_anycast(ifa); 3983 addrconf_leave_solict(ifa->idev, &ifa->addr); 3984 } 3985 3986 if (!keep) { 3987 write_lock_bh(&idev->lock); 3988 list_del_rcu(&ifa->if_list); 3989 write_unlock_bh(&idev->lock); 3990 in6_ifa_put(ifa); 3991 } 3992 } 3993 3994 /* Step 5: Discard anycast and multicast list */ 3995 if (unregister) { 3996 ipv6_ac_destroy_dev(idev); 3997 ipv6_mc_destroy_dev(idev); 3998 } else if (was_ready) { 3999 ipv6_mc_down(idev); 4000 } 4001 4002 WRITE_ONCE(idev->tstamp, jiffies); 4003 idev->ra_mtu = 0; 4004 4005 /* Last: Shot the device (if unregistered) */ 4006 if (unregister) { 4007 addrconf_sysctl_unregister(idev); 4008 neigh_parms_release(&nd_tbl, idev->nd_parms); 4009 neigh_ifdown(&nd_tbl, dev); 4010 in6_dev_put(idev); 4011 } 4012 return 0; 4013} 4014 4015static void addrconf_rs_timer(struct timer_list *t) 4016{ 4017 struct inet6_dev *idev = from_timer(idev, t, rs_timer); 4018 struct net_device *dev = idev->dev; 4019 struct in6_addr lladdr; 4020 int rtr_solicits; 4021 4022 write_lock(&idev->lock); 4023 if (idev->dead || !(idev->if_flags & IF_READY)) 4024 goto out; 4025 4026 if (!ipv6_accept_ra(idev)) 4027 goto out; 4028 4029 /* Announcement received after solicitation was sent */ 4030 if (idev->if_flags & IF_RA_RCVD) 4031 goto out; 4032 4033 rtr_solicits = READ_ONCE(idev->cnf.rtr_solicits); 4034 4035 if (idev->rs_probes++ < rtr_solicits || rtr_solicits < 0) { 4036 write_unlock(&idev->lock); 4037 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE)) 4038 ndisc_send_rs(dev, &lladdr, 4039 &in6addr_linklocal_allrouters); 4040 else 4041 goto put; 4042 4043 write_lock(&idev->lock); 4044 idev->rs_interval = rfc3315_s14_backoff_update( 4045 idev->rs_interval, 4046 READ_ONCE(idev->cnf.rtr_solicit_max_interval)); 4047 /* The wait after the last probe can be shorter */ 4048 addrconf_mod_rs_timer(idev, (idev->rs_probes == 4049 READ_ONCE(idev->cnf.rtr_solicits)) ? 4050 READ_ONCE(idev->cnf.rtr_solicit_delay) : 4051 idev->rs_interval); 4052 } else { 4053 /* 4054 * Note: we do not support deprecated "all on-link" 4055 * assumption any longer. 4056 */ 4057 pr_debug("%s: no IPv6 routers present\n", idev->dev->name); 4058 } 4059 4060out: 4061 write_unlock(&idev->lock); 4062put: 4063 in6_dev_put(idev); 4064} 4065 4066/* 4067 * Duplicate Address Detection 4068 */ 4069static void addrconf_dad_kick(struct inet6_ifaddr *ifp) 4070{ 4071 struct inet6_dev *idev = ifp->idev; 4072 unsigned long rand_num; 4073 u64 nonce; 4074 4075 if (ifp->flags & IFA_F_OPTIMISTIC) 4076 rand_num = 0; 4077 else 4078 rand_num = get_random_u32_below( 4079 READ_ONCE(idev->cnf.rtr_solicit_delay) ? : 1); 4080 4081 nonce = 0; 4082 if (READ_ONCE(idev->cnf.enhanced_dad) || 4083 READ_ONCE(dev_net(idev->dev)->ipv6.devconf_all->enhanced_dad)) { 4084 do 4085 get_random_bytes(&nonce, 6); 4086 while (nonce == 0); 4087 } 4088 ifp->dad_nonce = nonce; 4089 ifp->dad_probes = READ_ONCE(idev->cnf.dad_transmits); 4090 addrconf_mod_dad_work(ifp, rand_num); 4091} 4092 4093static void addrconf_dad_begin(struct inet6_ifaddr *ifp) 4094{ 4095 struct inet6_dev *idev = ifp->idev; 4096 struct net_device *dev = idev->dev; 4097 bool bump_id, notify = false; 4098 struct net *net; 4099 4100 addrconf_join_solict(dev, &ifp->addr); 4101 4102 read_lock_bh(&idev->lock); 4103 spin_lock(&ifp->lock); 4104 if (ifp->state == INET6_IFADDR_STATE_DEAD) 4105 goto out; 4106 4107 net = dev_net(dev); 4108 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) || 4109 (READ_ONCE(net->ipv6.devconf_all->accept_dad) < 1 && 4110 READ_ONCE(idev->cnf.accept_dad) < 1) || 4111 !(ifp->flags&IFA_F_TENTATIVE) || 4112 ifp->flags & IFA_F_NODAD) { 4113 bool send_na = false; 4114 4115 if (ifp->flags & IFA_F_TENTATIVE && 4116 !(ifp->flags & IFA_F_OPTIMISTIC)) 4117 send_na = true; 4118 bump_id = ifp->flags & IFA_F_TENTATIVE; 4119 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED); 4120 spin_unlock(&ifp->lock); 4121 read_unlock_bh(&idev->lock); 4122 4123 addrconf_dad_completed(ifp, bump_id, send_na); 4124 return; 4125 } 4126 4127 if (!(idev->if_flags & IF_READY)) { 4128 spin_unlock(&ifp->lock); 4129 read_unlock_bh(&idev->lock); 4130 /* 4131 * If the device is not ready: 4132 * - keep it tentative if it is a permanent address. 4133 * - otherwise, kill it. 4134 */ 4135 in6_ifa_hold(ifp); 4136 addrconf_dad_stop(ifp, 0); 4137 return; 4138 } 4139 4140 /* 4141 * Optimistic nodes can start receiving 4142 * Frames right away 4143 */ 4144 if (ifp->flags & IFA_F_OPTIMISTIC) { 4145 ip6_ins_rt(net, ifp->rt); 4146 if (ipv6_use_optimistic_addr(net, idev)) { 4147 /* Because optimistic nodes can use this address, 4148 * notify listeners. If DAD fails, RTM_DELADDR is sent. 4149 */ 4150 notify = true; 4151 } 4152 } 4153 4154 addrconf_dad_kick(ifp); 4155out: 4156 spin_unlock(&ifp->lock); 4157 read_unlock_bh(&idev->lock); 4158 if (notify) 4159 ipv6_ifa_notify(RTM_NEWADDR, ifp); 4160} 4161 4162static void addrconf_dad_start(struct inet6_ifaddr *ifp) 4163{ 4164 bool begin_dad = false; 4165 4166 spin_lock_bh(&ifp->lock); 4167 if (ifp->state != INET6_IFADDR_STATE_DEAD) { 4168 ifp->state = INET6_IFADDR_STATE_PREDAD; 4169 begin_dad = true; 4170 } 4171 spin_unlock_bh(&ifp->lock); 4172 4173 if (begin_dad) 4174 addrconf_mod_dad_work(ifp, 0); 4175} 4176 4177static void addrconf_dad_work(struct work_struct *w) 4178{ 4179 struct inet6_ifaddr *ifp = container_of(to_delayed_work(w), 4180 struct inet6_ifaddr, 4181 dad_work); 4182 struct inet6_dev *idev = ifp->idev; 4183 bool bump_id, disable_ipv6 = false; 4184 struct in6_addr mcaddr; 4185 4186 enum { 4187 DAD_PROCESS, 4188 DAD_BEGIN, 4189 DAD_ABORT, 4190 } action = DAD_PROCESS; 4191 4192 rtnl_lock(); 4193 4194 spin_lock_bh(&ifp->lock); 4195 if (ifp->state == INET6_IFADDR_STATE_PREDAD) { 4196 action = DAD_BEGIN; 4197 ifp->state = INET6_IFADDR_STATE_DAD; 4198 } else if (ifp->state == INET6_IFADDR_STATE_ERRDAD) { 4199 action = DAD_ABORT; 4200 ifp->state = INET6_IFADDR_STATE_POSTDAD; 4201 4202 if ((READ_ONCE(dev_net(idev->dev)->ipv6.devconf_all->accept_dad) > 1 || 4203 READ_ONCE(idev->cnf.accept_dad) > 1) && 4204 !idev->cnf.disable_ipv6 && 4205 !(ifp->flags & IFA_F_STABLE_PRIVACY)) { 4206 struct in6_addr addr; 4207 4208 addr.s6_addr32[0] = htonl(0xfe800000); 4209 addr.s6_addr32[1] = 0; 4210 4211 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) && 4212 ipv6_addr_equal(&ifp->addr, &addr)) { 4213 /* DAD failed for link-local based on MAC */ 4214 WRITE_ONCE(idev->cnf.disable_ipv6, 1); 4215 4216 pr_info("%s: IPv6 being disabled!\n", 4217 ifp->idev->dev->name); 4218 disable_ipv6 = true; 4219 } 4220 } 4221 } 4222 spin_unlock_bh(&ifp->lock); 4223 4224 if (action == DAD_BEGIN) { 4225 addrconf_dad_begin(ifp); 4226 goto out; 4227 } else if (action == DAD_ABORT) { 4228 in6_ifa_hold(ifp); 4229 addrconf_dad_stop(ifp, 1); 4230 if (disable_ipv6) 4231 addrconf_ifdown(idev->dev, false); 4232 goto out; 4233 } 4234 4235 if (!ifp->dad_probes && addrconf_dad_end(ifp)) 4236 goto out; 4237 4238 write_lock_bh(&idev->lock); 4239 if (idev->dead || !(idev->if_flags & IF_READY)) { 4240 write_unlock_bh(&idev->lock); 4241 goto out; 4242 } 4243 4244 spin_lock(&ifp->lock); 4245 if (ifp->state == INET6_IFADDR_STATE_DEAD) { 4246 spin_unlock(&ifp->lock); 4247 write_unlock_bh(&idev->lock); 4248 goto out; 4249 } 4250 4251 if (ifp->dad_probes == 0) { 4252 bool send_na = false; 4253 4254 /* 4255 * DAD was successful 4256 */ 4257 4258 if (ifp->flags & IFA_F_TENTATIVE && 4259 !(ifp->flags & IFA_F_OPTIMISTIC)) 4260 send_na = true; 4261 bump_id = ifp->flags & IFA_F_TENTATIVE; 4262 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED); 4263 spin_unlock(&ifp->lock); 4264 write_unlock_bh(&idev->lock); 4265 4266 addrconf_dad_completed(ifp, bump_id, send_na); 4267 4268 goto out; 4269 } 4270 4271 ifp->dad_probes--; 4272 addrconf_mod_dad_work(ifp, 4273 max(NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME), 4274 HZ/100)); 4275 spin_unlock(&ifp->lock); 4276 write_unlock_bh(&idev->lock); 4277 4278 /* send a neighbour solicitation for our addr */ 4279 addrconf_addr_solict_mult(&ifp->addr, &mcaddr); 4280 ndisc_send_ns(ifp->idev->dev, &ifp->addr, &mcaddr, &in6addr_any, 4281 ifp->dad_nonce); 4282out: 4283 in6_ifa_put(ifp); 4284 rtnl_unlock(); 4285} 4286 4287/* ifp->idev must be at least read locked */ 4288static bool ipv6_lonely_lladdr(struct inet6_ifaddr *ifp) 4289{ 4290 struct inet6_ifaddr *ifpiter; 4291 struct inet6_dev *idev = ifp->idev; 4292 4293 list_for_each_entry_reverse(ifpiter, &idev->addr_list, if_list) { 4294 if (ifpiter->scope > IFA_LINK) 4295 break; 4296 if (ifp != ifpiter && ifpiter->scope == IFA_LINK && 4297 (ifpiter->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE| 4298 IFA_F_OPTIMISTIC|IFA_F_DADFAILED)) == 4299 IFA_F_PERMANENT) 4300 return false; 4301 } 4302 return true; 4303} 4304 4305static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id, 4306 bool send_na) 4307{ 4308 struct net_device *dev = ifp->idev->dev; 4309 struct in6_addr lladdr; 4310 bool send_rs, send_mld; 4311 4312 addrconf_del_dad_work(ifp); 4313 4314 /* 4315 * Configure the address for reception. Now it is valid. 4316 */ 4317 4318 ipv6_ifa_notify(RTM_NEWADDR, ifp); 4319 4320 /* If added prefix is link local and we are prepared to process 4321 router advertisements, start sending router solicitations. 4322 */ 4323 4324 read_lock_bh(&ifp->idev->lock); 4325 send_mld = ifp->scope == IFA_LINK && ipv6_lonely_lladdr(ifp); 4326 send_rs = send_mld && 4327 ipv6_accept_ra(ifp->idev) && 4328 READ_ONCE(ifp->idev->cnf.rtr_solicits) != 0 && 4329 (dev->flags & IFF_LOOPBACK) == 0 && 4330 (dev->type != ARPHRD_TUNNEL) && 4331 !netif_is_team_port(dev); 4332 read_unlock_bh(&ifp->idev->lock); 4333 4334 /* While dad is in progress mld report's source address is in6_addrany. 4335 * Resend with proper ll now. 4336 */ 4337 if (send_mld) 4338 ipv6_mc_dad_complete(ifp->idev); 4339 4340 /* send unsolicited NA if enabled */ 4341 if (send_na && 4342 (READ_ONCE(ifp->idev->cnf.ndisc_notify) || 4343 READ_ONCE(dev_net(dev)->ipv6.devconf_all->ndisc_notify))) { 4344 ndisc_send_na(dev, &in6addr_linklocal_allnodes, &ifp->addr, 4345 /*router=*/ !!ifp->idev->cnf.forwarding, 4346 /*solicited=*/ false, /*override=*/ true, 4347 /*inc_opt=*/ true); 4348 } 4349 4350 if (send_rs) { 4351 /* 4352 * If a host as already performed a random delay 4353 * [...] as part of DAD [...] there is no need 4354 * to delay again before sending the first RS 4355 */ 4356 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE)) 4357 return; 4358 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters); 4359 4360 write_lock_bh(&ifp->idev->lock); 4361 spin_lock(&ifp->lock); 4362 ifp->idev->rs_interval = rfc3315_s14_backoff_init( 4363 READ_ONCE(ifp->idev->cnf.rtr_solicit_interval)); 4364 ifp->idev->rs_probes = 1; 4365 ifp->idev->if_flags |= IF_RS_SENT; 4366 addrconf_mod_rs_timer(ifp->idev, ifp->idev->rs_interval); 4367 spin_unlock(&ifp->lock); 4368 write_unlock_bh(&ifp->idev->lock); 4369 } 4370 4371 if (bump_id) 4372 rt_genid_bump_ipv6(dev_net(dev)); 4373 4374 /* Make sure that a new temporary address will be created 4375 * before this temporary address becomes deprecated. 4376 */ 4377 if (ifp->flags & IFA_F_TEMPORARY) 4378 addrconf_verify_rtnl(dev_net(dev)); 4379} 4380 4381static void addrconf_dad_run(struct inet6_dev *idev, bool restart) 4382{ 4383 struct inet6_ifaddr *ifp; 4384 4385 read_lock_bh(&idev->lock); 4386 list_for_each_entry(ifp, &idev->addr_list, if_list) { 4387 spin_lock(&ifp->lock); 4388 if ((ifp->flags & IFA_F_TENTATIVE && 4389 ifp->state == INET6_IFADDR_STATE_DAD) || restart) { 4390 if (restart) 4391 ifp->state = INET6_IFADDR_STATE_PREDAD; 4392 addrconf_dad_kick(ifp); 4393 } 4394 spin_unlock(&ifp->lock); 4395 } 4396 read_unlock_bh(&idev->lock); 4397} 4398 4399#ifdef CONFIG_PROC_FS 4400struct if6_iter_state { 4401 struct seq_net_private p; 4402 int bucket; 4403 int offset; 4404}; 4405 4406static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos) 4407{ 4408 struct if6_iter_state *state = seq->private; 4409 struct net *net = seq_file_net(seq); 4410 struct inet6_ifaddr *ifa = NULL; 4411 int p = 0; 4412 4413 /* initial bucket if pos is 0 */ 4414 if (pos == 0) { 4415 state->bucket = 0; 4416 state->offset = 0; 4417 } 4418 4419 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) { 4420 hlist_for_each_entry_rcu(ifa, &net->ipv6.inet6_addr_lst[state->bucket], 4421 addr_lst) { 4422 /* sync with offset */ 4423 if (p < state->offset) { 4424 p++; 4425 continue; 4426 } 4427 return ifa; 4428 } 4429 4430 /* prepare for next bucket */ 4431 state->offset = 0; 4432 p = 0; 4433 } 4434 return NULL; 4435} 4436 4437static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, 4438 struct inet6_ifaddr *ifa) 4439{ 4440 struct if6_iter_state *state = seq->private; 4441 struct net *net = seq_file_net(seq); 4442 4443 hlist_for_each_entry_continue_rcu(ifa, addr_lst) { 4444 state->offset++; 4445 return ifa; 4446 } 4447 4448 state->offset = 0; 4449 while (++state->bucket < IN6_ADDR_HSIZE) { 4450 hlist_for_each_entry_rcu(ifa, 4451 &net->ipv6.inet6_addr_lst[state->bucket], addr_lst) { 4452 return ifa; 4453 } 4454 } 4455 4456 return NULL; 4457} 4458 4459static void *if6_seq_start(struct seq_file *seq, loff_t *pos) 4460 __acquires(rcu) 4461{ 4462 rcu_read_lock(); 4463 return if6_get_first(seq, *pos); 4464} 4465 4466static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos) 4467{ 4468 struct inet6_ifaddr *ifa; 4469 4470 ifa = if6_get_next(seq, v); 4471 ++*pos; 4472 return ifa; 4473} 4474 4475static void if6_seq_stop(struct seq_file *seq, void *v) 4476 __releases(rcu) 4477{ 4478 rcu_read_unlock(); 4479} 4480 4481static int if6_seq_show(struct seq_file *seq, void *v) 4482{ 4483 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v; 4484 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n", 4485 &ifp->addr, 4486 ifp->idev->dev->ifindex, 4487 ifp->prefix_len, 4488 ifp->scope, 4489 (u8) ifp->flags, 4490 ifp->idev->dev->name); 4491 return 0; 4492} 4493 4494static const struct seq_operations if6_seq_ops = { 4495 .start = if6_seq_start, 4496 .next = if6_seq_next, 4497 .show = if6_seq_show, 4498 .stop = if6_seq_stop, 4499}; 4500 4501static int __net_init if6_proc_net_init(struct net *net) 4502{ 4503 if (!proc_create_net("if_inet6", 0444, net->proc_net, &if6_seq_ops, 4504 sizeof(struct if6_iter_state))) 4505 return -ENOMEM; 4506 return 0; 4507} 4508 4509static void __net_exit if6_proc_net_exit(struct net *net) 4510{ 4511 remove_proc_entry("if_inet6", net->proc_net); 4512} 4513 4514static struct pernet_operations if6_proc_net_ops = { 4515 .init = if6_proc_net_init, 4516 .exit = if6_proc_net_exit, 4517}; 4518 4519int __init if6_proc_init(void) 4520{ 4521 return register_pernet_subsys(&if6_proc_net_ops); 4522} 4523 4524void if6_proc_exit(void) 4525{ 4526 unregister_pernet_subsys(&if6_proc_net_ops); 4527} 4528#endif /* CONFIG_PROC_FS */ 4529 4530#if IS_ENABLED(CONFIG_IPV6_MIP6) 4531/* Check if address is a home address configured on any interface. */ 4532int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr) 4533{ 4534 unsigned int hash = inet6_addr_hash(net, addr); 4535 struct inet6_ifaddr *ifp = NULL; 4536 int ret = 0; 4537 4538 rcu_read_lock(); 4539 hlist_for_each_entry_rcu(ifp, &net->ipv6.inet6_addr_lst[hash], addr_lst) { 4540 if (ipv6_addr_equal(&ifp->addr, addr) && 4541 (ifp->flags & IFA_F_HOMEADDRESS)) { 4542 ret = 1; 4543 break; 4544 } 4545 } 4546 rcu_read_unlock(); 4547 return ret; 4548} 4549#endif 4550 4551/* RFC6554 has some algorithm to avoid loops in segment routing by 4552 * checking if the segments contains any of a local interface address. 4553 * 4554 * Quote: 4555 * 4556 * To detect loops in the SRH, a router MUST determine if the SRH 4557 * includes multiple addresses assigned to any interface on that router. 4558 * If such addresses appear more than once and are separated by at least 4559 * one address not assigned to that router. 4560 */ 4561int ipv6_chk_rpl_srh_loop(struct net *net, const struct in6_addr *segs, 4562 unsigned char nsegs) 4563{ 4564 const struct in6_addr *addr; 4565 int i, ret = 0, found = 0; 4566 struct inet6_ifaddr *ifp; 4567 bool separated = false; 4568 unsigned int hash; 4569 bool hash_found; 4570 4571 rcu_read_lock(); 4572 for (i = 0; i < nsegs; i++) { 4573 addr = &segs[i]; 4574 hash = inet6_addr_hash(net, addr); 4575 4576 hash_found = false; 4577 hlist_for_each_entry_rcu(ifp, &net->ipv6.inet6_addr_lst[hash], addr_lst) { 4578 4579 if (ipv6_addr_equal(&ifp->addr, addr)) { 4580 hash_found = true; 4581 break; 4582 } 4583 } 4584 4585 if (hash_found) { 4586 if (found > 1 && separated) { 4587 ret = 1; 4588 break; 4589 } 4590 4591 separated = false; 4592 found++; 4593 } else { 4594 separated = true; 4595 } 4596 } 4597 rcu_read_unlock(); 4598 4599 return ret; 4600} 4601 4602/* 4603 * Periodic address status verification 4604 */ 4605 4606static void addrconf_verify_rtnl(struct net *net) 4607{ 4608 unsigned long now, next, next_sec, next_sched; 4609 struct inet6_ifaddr *ifp; 4610 int i; 4611 4612 ASSERT_RTNL(); 4613 4614 rcu_read_lock_bh(); 4615 now = jiffies; 4616 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY); 4617 4618 cancel_delayed_work(&net->ipv6.addr_chk_work); 4619 4620 for (i = 0; i < IN6_ADDR_HSIZE; i++) { 4621restart: 4622 hlist_for_each_entry_rcu_bh(ifp, &net->ipv6.inet6_addr_lst[i], addr_lst) { 4623 unsigned long age; 4624 4625 /* When setting preferred_lft to a value not zero or 4626 * infinity, while valid_lft is infinity 4627 * IFA_F_PERMANENT has a non-infinity life time. 4628 */ 4629 if ((ifp->flags & IFA_F_PERMANENT) && 4630 (ifp->prefered_lft == INFINITY_LIFE_TIME)) 4631 continue; 4632 4633 spin_lock(&ifp->lock); 4634 /* We try to batch several events at once. */ 4635 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ; 4636 4637 if ((ifp->flags&IFA_F_TEMPORARY) && 4638 !(ifp->flags&IFA_F_TENTATIVE) && 4639 ifp->prefered_lft != INFINITY_LIFE_TIME && 4640 !ifp->regen_count && ifp->ifpub) { 4641 /* This is a non-regenerated temporary addr. */ 4642 4643 unsigned long regen_advance = ipv6_get_regen_advance(ifp->idev); 4644 4645 if (age + regen_advance >= ifp->prefered_lft) { 4646 struct inet6_ifaddr *ifpub = ifp->ifpub; 4647 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 4648 next = ifp->tstamp + ifp->prefered_lft * HZ; 4649 4650 ifp->regen_count++; 4651 in6_ifa_hold(ifp); 4652 in6_ifa_hold(ifpub); 4653 spin_unlock(&ifp->lock); 4654 4655 spin_lock(&ifpub->lock); 4656 ifpub->regen_count = 0; 4657 spin_unlock(&ifpub->lock); 4658 rcu_read_unlock_bh(); 4659 ipv6_create_tempaddr(ifpub, true); 4660 in6_ifa_put(ifpub); 4661 in6_ifa_put(ifp); 4662 rcu_read_lock_bh(); 4663 goto restart; 4664 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next)) 4665 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ; 4666 } 4667 4668 if (ifp->valid_lft != INFINITY_LIFE_TIME && 4669 age >= ifp->valid_lft) { 4670 spin_unlock(&ifp->lock); 4671 in6_ifa_hold(ifp); 4672 rcu_read_unlock_bh(); 4673 ipv6_del_addr(ifp); 4674 rcu_read_lock_bh(); 4675 goto restart; 4676 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) { 4677 spin_unlock(&ifp->lock); 4678 continue; 4679 } else if (age >= ifp->prefered_lft) { 4680 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */ 4681 int deprecate = 0; 4682 4683 if (!(ifp->flags&IFA_F_DEPRECATED)) { 4684 deprecate = 1; 4685 ifp->flags |= IFA_F_DEPRECATED; 4686 } 4687 4688 if ((ifp->valid_lft != INFINITY_LIFE_TIME) && 4689 (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))) 4690 next = ifp->tstamp + ifp->valid_lft * HZ; 4691 4692 spin_unlock(&ifp->lock); 4693 4694 if (deprecate) { 4695 in6_ifa_hold(ifp); 4696 4697 ipv6_ifa_notify(0, ifp); 4698 in6_ifa_put(ifp); 4699 goto restart; 4700 } 4701 } else { 4702 /* ifp->prefered_lft <= ifp->valid_lft */ 4703 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 4704 next = ifp->tstamp + ifp->prefered_lft * HZ; 4705 spin_unlock(&ifp->lock); 4706 } 4707 } 4708 } 4709 4710 next_sec = round_jiffies_up(next); 4711 next_sched = next; 4712 4713 /* If rounded timeout is accurate enough, accept it. */ 4714 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ)) 4715 next_sched = next_sec; 4716 4717 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */ 4718 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX)) 4719 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX; 4720 4721 pr_debug("now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n", 4722 now, next, next_sec, next_sched); 4723 mod_delayed_work(addrconf_wq, &net->ipv6.addr_chk_work, next_sched - now); 4724 rcu_read_unlock_bh(); 4725} 4726 4727static void addrconf_verify_work(struct work_struct *w) 4728{ 4729 struct net *net = container_of(to_delayed_work(w), struct net, 4730 ipv6.addr_chk_work); 4731 4732 rtnl_lock(); 4733 addrconf_verify_rtnl(net); 4734 rtnl_unlock(); 4735} 4736 4737static void addrconf_verify(struct net *net) 4738{ 4739 mod_delayed_work(addrconf_wq, &net->ipv6.addr_chk_work, 0); 4740} 4741 4742static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local, 4743 struct in6_addr **peer_pfx) 4744{ 4745 struct in6_addr *pfx = NULL; 4746 4747 *peer_pfx = NULL; 4748 4749 if (addr) 4750 pfx = nla_data(addr); 4751 4752 if (local) { 4753 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx))) 4754 *peer_pfx = pfx; 4755 pfx = nla_data(local); 4756 } 4757 4758 return pfx; 4759} 4760 4761static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = { 4762 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) }, 4763 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) }, 4764 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) }, 4765 [IFA_FLAGS] = { .len = sizeof(u32) }, 4766 [IFA_RT_PRIORITY] = { .len = sizeof(u32) }, 4767 [IFA_TARGET_NETNSID] = { .type = NLA_S32 }, 4768 [IFA_PROTO] = { .type = NLA_U8 }, 4769}; 4770 4771static int 4772inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, 4773 struct netlink_ext_ack *extack) 4774{ 4775 struct net *net = sock_net(skb->sk); 4776 struct ifaddrmsg *ifm; 4777 struct nlattr *tb[IFA_MAX+1]; 4778 struct in6_addr *pfx, *peer_pfx; 4779 u32 ifa_flags; 4780 int err; 4781 4782 err = nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX, 4783 ifa_ipv6_policy, extack); 4784 if (err < 0) 4785 return err; 4786 4787 ifm = nlmsg_data(nlh); 4788 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx); 4789 if (!pfx) 4790 return -EINVAL; 4791 4792 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags; 4793 4794 /* We ignore other flags so far. */ 4795 ifa_flags &= IFA_F_MANAGETEMPADDR; 4796 4797 return inet6_addr_del(net, ifm->ifa_index, ifa_flags, pfx, 4798 ifm->ifa_prefixlen, extack); 4799} 4800 4801static int modify_prefix_route(struct inet6_ifaddr *ifp, 4802 unsigned long expires, u32 flags, 4803 bool modify_peer) 4804{ 4805 struct fib6_table *table; 4806 struct fib6_info *f6i; 4807 u32 prio; 4808 4809 f6i = addrconf_get_prefix_route(modify_peer ? &ifp->peer_addr : &ifp->addr, 4810 ifp->prefix_len, 4811 ifp->idev->dev, 0, RTF_DEFAULT, true); 4812 if (!f6i) 4813 return -ENOENT; 4814 4815 prio = ifp->rt_priority ? : IP6_RT_PRIO_ADDRCONF; 4816 if (f6i->fib6_metric != prio) { 4817 /* delete old one */ 4818 ip6_del_rt(dev_net(ifp->idev->dev), f6i, false); 4819 4820 /* add new one */ 4821 addrconf_prefix_route(modify_peer ? &ifp->peer_addr : &ifp->addr, 4822 ifp->prefix_len, 4823 ifp->rt_priority, ifp->idev->dev, 4824 expires, flags, GFP_KERNEL); 4825 } else { 4826 table = f6i->fib6_table; 4827 spin_lock_bh(&table->tb6_lock); 4828 4829 if (!(flags & RTF_EXPIRES)) { 4830 fib6_clean_expires(f6i); 4831 fib6_remove_gc_list(f6i); 4832 } else { 4833 fib6_set_expires(f6i, expires); 4834 fib6_add_gc_list(f6i); 4835 } 4836 4837 spin_unlock_bh(&table->tb6_lock); 4838 4839 fib6_info_release(f6i); 4840 } 4841 4842 return 0; 4843} 4844 4845static int inet6_addr_modify(struct net *net, struct inet6_ifaddr *ifp, 4846 struct ifa6_config *cfg) 4847{ 4848 u32 flags; 4849 clock_t expires; 4850 unsigned long timeout; 4851 bool was_managetempaddr; 4852 bool had_prefixroute; 4853 bool new_peer = false; 4854 4855 ASSERT_RTNL(); 4856 4857 if (!cfg->valid_lft || cfg->preferred_lft > cfg->valid_lft) 4858 return -EINVAL; 4859 4860 if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR && 4861 (ifp->flags & IFA_F_TEMPORARY || ifp->prefix_len != 64)) 4862 return -EINVAL; 4863 4864 if (!(ifp->flags & IFA_F_TENTATIVE) || ifp->flags & IFA_F_DADFAILED) 4865 cfg->ifa_flags &= ~IFA_F_OPTIMISTIC; 4866 4867 timeout = addrconf_timeout_fixup(cfg->valid_lft, HZ); 4868 if (addrconf_finite_timeout(timeout)) { 4869 expires = jiffies_to_clock_t(timeout * HZ); 4870 cfg->valid_lft = timeout; 4871 flags = RTF_EXPIRES; 4872 } else { 4873 expires = 0; 4874 flags = 0; 4875 cfg->ifa_flags |= IFA_F_PERMANENT; 4876 } 4877 4878 timeout = addrconf_timeout_fixup(cfg->preferred_lft, HZ); 4879 if (addrconf_finite_timeout(timeout)) { 4880 if (timeout == 0) 4881 cfg->ifa_flags |= IFA_F_DEPRECATED; 4882 cfg->preferred_lft = timeout; 4883 } 4884 4885 if (cfg->peer_pfx && 4886 memcmp(&ifp->peer_addr, cfg->peer_pfx, sizeof(struct in6_addr))) { 4887 if (!ipv6_addr_any(&ifp->peer_addr)) 4888 cleanup_prefix_route(ifp, expires, true, true); 4889 new_peer = true; 4890 } 4891 4892 spin_lock_bh(&ifp->lock); 4893 was_managetempaddr = ifp->flags & IFA_F_MANAGETEMPADDR; 4894 had_prefixroute = ifp->flags & IFA_F_PERMANENT && 4895 !(ifp->flags & IFA_F_NOPREFIXROUTE); 4896 ifp->flags &= ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | 4897 IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR | 4898 IFA_F_NOPREFIXROUTE); 4899 ifp->flags |= cfg->ifa_flags; 4900 WRITE_ONCE(ifp->tstamp, jiffies); 4901 WRITE_ONCE(ifp->valid_lft, cfg->valid_lft); 4902 WRITE_ONCE(ifp->prefered_lft, cfg->preferred_lft); 4903 WRITE_ONCE(ifp->ifa_proto, cfg->ifa_proto); 4904 4905 if (cfg->rt_priority && cfg->rt_priority != ifp->rt_priority) 4906 WRITE_ONCE(ifp->rt_priority, cfg->rt_priority); 4907 4908 if (new_peer) 4909 ifp->peer_addr = *cfg->peer_pfx; 4910 4911 spin_unlock_bh(&ifp->lock); 4912 if (!(ifp->flags&IFA_F_TENTATIVE)) 4913 ipv6_ifa_notify(0, ifp); 4914 4915 if (!(cfg->ifa_flags & IFA_F_NOPREFIXROUTE)) { 4916 int rc = -ENOENT; 4917 4918 if (had_prefixroute) 4919 rc = modify_prefix_route(ifp, expires, flags, false); 4920 4921 /* prefix route could have been deleted; if so restore it */ 4922 if (rc == -ENOENT) { 4923 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, 4924 ifp->rt_priority, ifp->idev->dev, 4925 expires, flags, GFP_KERNEL); 4926 } 4927 4928 if (had_prefixroute && !ipv6_addr_any(&ifp->peer_addr)) 4929 rc = modify_prefix_route(ifp, expires, flags, true); 4930 4931 if (rc == -ENOENT && !ipv6_addr_any(&ifp->peer_addr)) { 4932 addrconf_prefix_route(&ifp->peer_addr, ifp->prefix_len, 4933 ifp->rt_priority, ifp->idev->dev, 4934 expires, flags, GFP_KERNEL); 4935 } 4936 } else if (had_prefixroute) { 4937 enum cleanup_prefix_rt_t action; 4938 unsigned long rt_expires; 4939 4940 write_lock_bh(&ifp->idev->lock); 4941 action = check_cleanup_prefix_route(ifp, &rt_expires); 4942 write_unlock_bh(&ifp->idev->lock); 4943 4944 if (action != CLEANUP_PREFIX_RT_NOP) { 4945 cleanup_prefix_route(ifp, rt_expires, 4946 action == CLEANUP_PREFIX_RT_DEL, false); 4947 } 4948 } 4949 4950 if (was_managetempaddr || ifp->flags & IFA_F_MANAGETEMPADDR) { 4951 if (was_managetempaddr && 4952 !(ifp->flags & IFA_F_MANAGETEMPADDR)) { 4953 cfg->valid_lft = 0; 4954 cfg->preferred_lft = 0; 4955 } 4956 manage_tempaddrs(ifp->idev, ifp, cfg->valid_lft, 4957 cfg->preferred_lft, !was_managetempaddr, 4958 jiffies); 4959 } 4960 4961 addrconf_verify_rtnl(net); 4962 4963 return 0; 4964} 4965 4966static int 4967inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, 4968 struct netlink_ext_ack *extack) 4969{ 4970 struct net *net = sock_net(skb->sk); 4971 struct ifaddrmsg *ifm; 4972 struct nlattr *tb[IFA_MAX+1]; 4973 struct in6_addr *peer_pfx; 4974 struct inet6_ifaddr *ifa; 4975 struct net_device *dev; 4976 struct inet6_dev *idev; 4977 struct ifa6_config cfg; 4978 int err; 4979 4980 err = nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX, 4981 ifa_ipv6_policy, extack); 4982 if (err < 0) 4983 return err; 4984 4985 memset(&cfg, 0, sizeof(cfg)); 4986 4987 ifm = nlmsg_data(nlh); 4988 cfg.pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx); 4989 if (!cfg.pfx) 4990 return -EINVAL; 4991 4992 cfg.peer_pfx = peer_pfx; 4993 cfg.plen = ifm->ifa_prefixlen; 4994 if (tb[IFA_RT_PRIORITY]) 4995 cfg.rt_priority = nla_get_u32(tb[IFA_RT_PRIORITY]); 4996 4997 if (tb[IFA_PROTO]) 4998 cfg.ifa_proto = nla_get_u8(tb[IFA_PROTO]); 4999 5000 cfg.valid_lft = INFINITY_LIFE_TIME; 5001 cfg.preferred_lft = INFINITY_LIFE_TIME; 5002 5003 if (tb[IFA_CACHEINFO]) { 5004 struct ifa_cacheinfo *ci; 5005 5006 ci = nla_data(tb[IFA_CACHEINFO]); 5007 cfg.valid_lft = ci->ifa_valid; 5008 cfg.preferred_lft = ci->ifa_prefered; 5009 } 5010 5011 dev = __dev_get_by_index(net, ifm->ifa_index); 5012 if (!dev) { 5013 NL_SET_ERR_MSG_MOD(extack, "Unable to find the interface"); 5014 return -ENODEV; 5015 } 5016 5017 if (tb[IFA_FLAGS]) 5018 cfg.ifa_flags = nla_get_u32(tb[IFA_FLAGS]); 5019 else 5020 cfg.ifa_flags = ifm->ifa_flags; 5021 5022 /* We ignore other flags so far. */ 5023 cfg.ifa_flags &= IFA_F_NODAD | IFA_F_HOMEADDRESS | 5024 IFA_F_MANAGETEMPADDR | IFA_F_NOPREFIXROUTE | 5025 IFA_F_MCAUTOJOIN | IFA_F_OPTIMISTIC; 5026 5027 idev = ipv6_find_idev(dev); 5028 if (IS_ERR(idev)) 5029 return PTR_ERR(idev); 5030 5031 if (!ipv6_allow_optimistic_dad(net, idev)) 5032 cfg.ifa_flags &= ~IFA_F_OPTIMISTIC; 5033 5034 if (cfg.ifa_flags & IFA_F_NODAD && 5035 cfg.ifa_flags & IFA_F_OPTIMISTIC) { 5036 NL_SET_ERR_MSG(extack, "IFA_F_NODAD and IFA_F_OPTIMISTIC are mutually exclusive"); 5037 return -EINVAL; 5038 } 5039 5040 ifa = ipv6_get_ifaddr(net, cfg.pfx, dev, 1); 5041 if (!ifa) { 5042 /* 5043 * It would be best to check for !NLM_F_CREATE here but 5044 * userspace already relies on not having to provide this. 5045 */ 5046 return inet6_addr_add(net, ifm->ifa_index, &cfg, extack); 5047 } 5048 5049 if (nlh->nlmsg_flags & NLM_F_EXCL || 5050 !(nlh->nlmsg_flags & NLM_F_REPLACE)) { 5051 NL_SET_ERR_MSG_MOD(extack, "address already assigned"); 5052 err = -EEXIST; 5053 } else { 5054 err = inet6_addr_modify(net, ifa, &cfg); 5055 } 5056 5057 in6_ifa_put(ifa); 5058 5059 return err; 5060} 5061 5062static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u32 flags, 5063 u8 scope, int ifindex) 5064{ 5065 struct ifaddrmsg *ifm; 5066 5067 ifm = nlmsg_data(nlh); 5068 ifm->ifa_family = AF_INET6; 5069 ifm->ifa_prefixlen = prefixlen; 5070 ifm->ifa_flags = flags; 5071 ifm->ifa_scope = scope; 5072 ifm->ifa_index = ifindex; 5073} 5074 5075static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp, 5076 unsigned long tstamp, u32 preferred, u32 valid) 5077{ 5078 struct ifa_cacheinfo ci; 5079 5080 ci.cstamp = cstamp_delta(cstamp); 5081 ci.tstamp = cstamp_delta(tstamp); 5082 ci.ifa_prefered = preferred; 5083 ci.ifa_valid = valid; 5084 5085 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci); 5086} 5087 5088static inline int rt_scope(int ifa_scope) 5089{ 5090 if (ifa_scope & IFA_HOST) 5091 return RT_SCOPE_HOST; 5092 else if (ifa_scope & IFA_LINK) 5093 return RT_SCOPE_LINK; 5094 else if (ifa_scope & IFA_SITE) 5095 return RT_SCOPE_SITE; 5096 else 5097 return RT_SCOPE_UNIVERSE; 5098} 5099 5100static inline int inet6_ifaddr_msgsize(void) 5101{ 5102 return NLMSG_ALIGN(sizeof(struct ifaddrmsg)) 5103 + nla_total_size(16) /* IFA_LOCAL */ 5104 + nla_total_size(16) /* IFA_ADDRESS */ 5105 + nla_total_size(sizeof(struct ifa_cacheinfo)) 5106 + nla_total_size(4) /* IFA_FLAGS */ 5107 + nla_total_size(1) /* IFA_PROTO */ 5108 + nla_total_size(4) /* IFA_RT_PRIORITY */; 5109} 5110 5111enum addr_type_t { 5112 UNICAST_ADDR, 5113 MULTICAST_ADDR, 5114 ANYCAST_ADDR, 5115}; 5116 5117struct inet6_fill_args { 5118 u32 portid; 5119 u32 seq; 5120 int event; 5121 unsigned int flags; 5122 int netnsid; 5123 int ifindex; 5124 enum addr_type_t type; 5125}; 5126 5127static int inet6_fill_ifaddr(struct sk_buff *skb, 5128 const struct inet6_ifaddr *ifa, 5129 struct inet6_fill_args *args) 5130{ 5131 struct nlmsghdr *nlh; 5132 u32 preferred, valid; 5133 u32 flags, priority; 5134 u8 proto; 5135 5136 nlh = nlmsg_put(skb, args->portid, args->seq, args->event, 5137 sizeof(struct ifaddrmsg), args->flags); 5138 if (!nlh) 5139 return -EMSGSIZE; 5140 5141 flags = READ_ONCE(ifa->flags); 5142 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope), 5143 ifa->idev->dev->ifindex); 5144 5145 if (args->netnsid >= 0 && 5146 nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid)) 5147 goto error; 5148 5149 preferred = READ_ONCE(ifa->prefered_lft); 5150 valid = READ_ONCE(ifa->valid_lft); 5151 5152 if (!((flags & IFA_F_PERMANENT) && 5153 (preferred == INFINITY_LIFE_TIME))) { 5154 if (preferred != INFINITY_LIFE_TIME) { 5155 long tval = (jiffies - READ_ONCE(ifa->tstamp)) / HZ; 5156 5157 if (preferred > tval) 5158 preferred -= tval; 5159 else 5160 preferred = 0; 5161 if (valid != INFINITY_LIFE_TIME) { 5162 if (valid > tval) 5163 valid -= tval; 5164 else 5165 valid = 0; 5166 } 5167 } 5168 } else { 5169 preferred = INFINITY_LIFE_TIME; 5170 valid = INFINITY_LIFE_TIME; 5171 } 5172 5173 if (!ipv6_addr_any(&ifa->peer_addr)) { 5174 if (nla_put_in6_addr(skb, IFA_LOCAL, &ifa->addr) < 0 || 5175 nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->peer_addr) < 0) 5176 goto error; 5177 } else { 5178 if (nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->addr) < 0) 5179 goto error; 5180 } 5181 5182 priority = READ_ONCE(ifa->rt_priority); 5183 if (priority && nla_put_u32(skb, IFA_RT_PRIORITY, priority)) 5184 goto error; 5185 5186 if (put_cacheinfo(skb, ifa->cstamp, READ_ONCE(ifa->tstamp), 5187 preferred, valid) < 0) 5188 goto error; 5189 5190 if (nla_put_u32(skb, IFA_FLAGS, flags) < 0) 5191 goto error; 5192 5193 proto = READ_ONCE(ifa->ifa_proto); 5194 if (proto && nla_put_u8(skb, IFA_PROTO, proto)) 5195 goto error; 5196 5197 nlmsg_end(skb, nlh); 5198 return 0; 5199 5200error: 5201 nlmsg_cancel(skb, nlh); 5202 return -EMSGSIZE; 5203} 5204 5205static int inet6_fill_ifmcaddr(struct sk_buff *skb, 5206 const struct ifmcaddr6 *ifmca, 5207 struct inet6_fill_args *args) 5208{ 5209 int ifindex = ifmca->idev->dev->ifindex; 5210 u8 scope = RT_SCOPE_UNIVERSE; 5211 struct nlmsghdr *nlh; 5212 5213 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE) 5214 scope = RT_SCOPE_SITE; 5215 5216 nlh = nlmsg_put(skb, args->portid, args->seq, args->event, 5217 sizeof(struct ifaddrmsg), args->flags); 5218 if (!nlh) 5219 return -EMSGSIZE; 5220 5221 if (args->netnsid >= 0 && 5222 nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid)) { 5223 nlmsg_cancel(skb, nlh); 5224 return -EMSGSIZE; 5225 } 5226 5227 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 5228 if (nla_put_in6_addr(skb, IFA_MULTICAST, &ifmca->mca_addr) < 0 || 5229 put_cacheinfo(skb, ifmca->mca_cstamp, READ_ONCE(ifmca->mca_tstamp), 5230 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 5231 nlmsg_cancel(skb, nlh); 5232 return -EMSGSIZE; 5233 } 5234 5235 nlmsg_end(skb, nlh); 5236 return 0; 5237} 5238 5239static int inet6_fill_ifacaddr(struct sk_buff *skb, 5240 const struct ifacaddr6 *ifaca, 5241 struct inet6_fill_args *args) 5242{ 5243 struct net_device *dev = fib6_info_nh_dev(ifaca->aca_rt); 5244 int ifindex = dev ? dev->ifindex : 1; 5245 u8 scope = RT_SCOPE_UNIVERSE; 5246 struct nlmsghdr *nlh; 5247 5248 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE) 5249 scope = RT_SCOPE_SITE; 5250 5251 nlh = nlmsg_put(skb, args->portid, args->seq, args->event, 5252 sizeof(struct ifaddrmsg), args->flags); 5253 if (!nlh) 5254 return -EMSGSIZE; 5255 5256 if (args->netnsid >= 0 && 5257 nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid)) { 5258 nlmsg_cancel(skb, nlh); 5259 return -EMSGSIZE; 5260 } 5261 5262 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 5263 if (nla_put_in6_addr(skb, IFA_ANYCAST, &ifaca->aca_addr) < 0 || 5264 put_cacheinfo(skb, ifaca->aca_cstamp, READ_ONCE(ifaca->aca_tstamp), 5265 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 5266 nlmsg_cancel(skb, nlh); 5267 return -EMSGSIZE; 5268 } 5269 5270 nlmsg_end(skb, nlh); 5271 return 0; 5272} 5273 5274/* called with rcu_read_lock() */ 5275static int in6_dump_addrs(const struct inet6_dev *idev, struct sk_buff *skb, 5276 struct netlink_callback *cb, int *s_ip_idx, 5277 struct inet6_fill_args *fillargs) 5278{ 5279 const struct ifmcaddr6 *ifmca; 5280 const struct ifacaddr6 *ifaca; 5281 int ip_idx = 0; 5282 int err = 0; 5283 5284 switch (fillargs->type) { 5285 case UNICAST_ADDR: { 5286 const struct inet6_ifaddr *ifa; 5287 fillargs->event = RTM_NEWADDR; 5288 5289 /* unicast address incl. temp addr */ 5290 list_for_each_entry_rcu(ifa, &idev->addr_list, if_list) { 5291 if (ip_idx < *s_ip_idx) 5292 goto next; 5293 err = inet6_fill_ifaddr(skb, ifa, fillargs); 5294 if (err < 0) 5295 break; 5296 nl_dump_check_consistent(cb, nlmsg_hdr(skb)); 5297next: 5298 ip_idx++; 5299 } 5300 break; 5301 } 5302 case MULTICAST_ADDR: 5303 fillargs->event = RTM_GETMULTICAST; 5304 5305 /* multicast address */ 5306 for (ifmca = rcu_dereference(idev->mc_list); 5307 ifmca; 5308 ifmca = rcu_dereference(ifmca->next), ip_idx++) { 5309 if (ip_idx < *s_ip_idx) 5310 continue; 5311 err = inet6_fill_ifmcaddr(skb, ifmca, fillargs); 5312 if (err < 0) 5313 break; 5314 } 5315 break; 5316 case ANYCAST_ADDR: 5317 fillargs->event = RTM_GETANYCAST; 5318 /* anycast address */ 5319 for (ifaca = rcu_dereference(idev->ac_list); ifaca; 5320 ifaca = rcu_dereference(ifaca->aca_next), ip_idx++) { 5321 if (ip_idx < *s_ip_idx) 5322 continue; 5323 err = inet6_fill_ifacaddr(skb, ifaca, fillargs); 5324 if (err < 0) 5325 break; 5326 } 5327 break; 5328 default: 5329 break; 5330 } 5331 *s_ip_idx = err ? ip_idx : 0; 5332 return err; 5333} 5334 5335static int inet6_valid_dump_ifaddr_req(const struct nlmsghdr *nlh, 5336 struct inet6_fill_args *fillargs, 5337 struct net **tgt_net, struct sock *sk, 5338 struct netlink_callback *cb) 5339{ 5340 struct netlink_ext_ack *extack = cb->extack; 5341 struct nlattr *tb[IFA_MAX+1]; 5342 struct ifaddrmsg *ifm; 5343 int err, i; 5344 5345 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) { 5346 NL_SET_ERR_MSG_MOD(extack, "Invalid header for address dump request"); 5347 return -EINVAL; 5348 } 5349 5350 ifm = nlmsg_data(nlh); 5351 if (ifm->ifa_prefixlen || ifm->ifa_flags || ifm->ifa_scope) { 5352 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for address dump request"); 5353 return -EINVAL; 5354 } 5355 5356 fillargs->ifindex = ifm->ifa_index; 5357 if (fillargs->ifindex) { 5358 cb->answer_flags |= NLM_F_DUMP_FILTERED; 5359 fillargs->flags |= NLM_F_DUMP_FILTERED; 5360 } 5361 5362 err = nlmsg_parse_deprecated_strict(nlh, sizeof(*ifm), tb, IFA_MAX, 5363 ifa_ipv6_policy, extack); 5364 if (err < 0) 5365 return err; 5366 5367 for (i = 0; i <= IFA_MAX; ++i) { 5368 if (!tb[i]) 5369 continue; 5370 5371 if (i == IFA_TARGET_NETNSID) { 5372 struct net *net; 5373 5374 fillargs->netnsid = nla_get_s32(tb[i]); 5375 net = rtnl_get_net_ns_capable(sk, fillargs->netnsid); 5376 if (IS_ERR(net)) { 5377 fillargs->netnsid = -1; 5378 NL_SET_ERR_MSG_MOD(extack, "Invalid target network namespace id"); 5379 return PTR_ERR(net); 5380 } 5381 *tgt_net = net; 5382 } else { 5383 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in dump request"); 5384 return -EINVAL; 5385 } 5386 } 5387 5388 return 0; 5389} 5390 5391static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb, 5392 enum addr_type_t type) 5393{ 5394 struct net *tgt_net = sock_net(skb->sk); 5395 const struct nlmsghdr *nlh = cb->nlh; 5396 struct inet6_fill_args fillargs = { 5397 .portid = NETLINK_CB(cb->skb).portid, 5398 .seq = cb->nlh->nlmsg_seq, 5399 .flags = NLM_F_MULTI, 5400 .netnsid = -1, 5401 .type = type, 5402 }; 5403 struct { 5404 unsigned long ifindex; 5405 int ip_idx; 5406 } *ctx = (void *)cb->ctx; 5407 struct net_device *dev; 5408 struct inet6_dev *idev; 5409 int err = 0; 5410 5411 rcu_read_lock(); 5412 if (cb->strict_check) { 5413 err = inet6_valid_dump_ifaddr_req(nlh, &fillargs, &tgt_net, 5414 skb->sk, cb); 5415 if (err < 0) 5416 goto done; 5417 5418 err = 0; 5419 if (fillargs.ifindex) { 5420 dev = dev_get_by_index_rcu(tgt_net, fillargs.ifindex); 5421 if (!dev) { 5422 err = -ENODEV; 5423 goto done; 5424 } 5425 idev = __in6_dev_get(dev); 5426 if (idev) 5427 err = in6_dump_addrs(idev, skb, cb, 5428 &ctx->ip_idx, 5429 &fillargs); 5430 goto done; 5431 } 5432 } 5433 5434 cb->seq = inet6_base_seq(tgt_net); 5435 for_each_netdev_dump(tgt_net, dev, ctx->ifindex) { 5436 idev = __in6_dev_get(dev); 5437 if (!idev) 5438 continue; 5439 err = in6_dump_addrs(idev, skb, cb, &ctx->ip_idx, 5440 &fillargs); 5441 if (err < 0) 5442 goto done; 5443 } 5444done: 5445 rcu_read_unlock(); 5446 if (fillargs.netnsid >= 0) 5447 put_net(tgt_net); 5448 5449 return err; 5450} 5451 5452static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb) 5453{ 5454 enum addr_type_t type = UNICAST_ADDR; 5455 5456 return inet6_dump_addr(skb, cb, type); 5457} 5458 5459static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb) 5460{ 5461 enum addr_type_t type = MULTICAST_ADDR; 5462 5463 return inet6_dump_addr(skb, cb, type); 5464} 5465 5466 5467static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb) 5468{ 5469 enum addr_type_t type = ANYCAST_ADDR; 5470 5471 return inet6_dump_addr(skb, cb, type); 5472} 5473 5474static int inet6_rtm_valid_getaddr_req(struct sk_buff *skb, 5475 const struct nlmsghdr *nlh, 5476 struct nlattr **tb, 5477 struct netlink_ext_ack *extack) 5478{ 5479 struct ifaddrmsg *ifm; 5480 int i, err; 5481 5482 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) { 5483 NL_SET_ERR_MSG_MOD(extack, "Invalid header for get address request"); 5484 return -EINVAL; 5485 } 5486 5487 if (!netlink_strict_get_check(skb)) 5488 return nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX, 5489 ifa_ipv6_policy, extack); 5490 5491 ifm = nlmsg_data(nlh); 5492 if (ifm->ifa_prefixlen || ifm->ifa_flags || ifm->ifa_scope) { 5493 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for get address request"); 5494 return -EINVAL; 5495 } 5496 5497 err = nlmsg_parse_deprecated_strict(nlh, sizeof(*ifm), tb, IFA_MAX, 5498 ifa_ipv6_policy, extack); 5499 if (err) 5500 return err; 5501 5502 for (i = 0; i <= IFA_MAX; i++) { 5503 if (!tb[i]) 5504 continue; 5505 5506 switch (i) { 5507 case IFA_TARGET_NETNSID: 5508 case IFA_ADDRESS: 5509 case IFA_LOCAL: 5510 break; 5511 default: 5512 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in get address request"); 5513 return -EINVAL; 5514 } 5515 } 5516 5517 return 0; 5518} 5519 5520static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh, 5521 struct netlink_ext_ack *extack) 5522{ 5523 struct net *tgt_net = sock_net(in_skb->sk); 5524 struct inet6_fill_args fillargs = { 5525 .portid = NETLINK_CB(in_skb).portid, 5526 .seq = nlh->nlmsg_seq, 5527 .event = RTM_NEWADDR, 5528 .flags = 0, 5529 .netnsid = -1, 5530 }; 5531 struct ifaddrmsg *ifm; 5532 struct nlattr *tb[IFA_MAX+1]; 5533 struct in6_addr *addr = NULL, *peer; 5534 struct net_device *dev = NULL; 5535 struct inet6_ifaddr *ifa; 5536 struct sk_buff *skb; 5537 int err; 5538 5539 err = inet6_rtm_valid_getaddr_req(in_skb, nlh, tb, extack); 5540 if (err < 0) 5541 return err; 5542 5543 if (tb[IFA_TARGET_NETNSID]) { 5544 fillargs.netnsid = nla_get_s32(tb[IFA_TARGET_NETNSID]); 5545 5546 tgt_net = rtnl_get_net_ns_capable(NETLINK_CB(in_skb).sk, 5547 fillargs.netnsid); 5548 if (IS_ERR(tgt_net)) 5549 return PTR_ERR(tgt_net); 5550 } 5551 5552 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer); 5553 if (!addr) { 5554 err = -EINVAL; 5555 goto errout; 5556 } 5557 ifm = nlmsg_data(nlh); 5558 if (ifm->ifa_index) 5559 dev = dev_get_by_index(tgt_net, ifm->ifa_index); 5560 5561 ifa = ipv6_get_ifaddr(tgt_net, addr, dev, 1); 5562 if (!ifa) { 5563 err = -EADDRNOTAVAIL; 5564 goto errout; 5565 } 5566 5567 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL); 5568 if (!skb) { 5569 err = -ENOBUFS; 5570 goto errout_ifa; 5571 } 5572 5573 err = inet6_fill_ifaddr(skb, ifa, &fillargs); 5574 if (err < 0) { 5575 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 5576 WARN_ON(err == -EMSGSIZE); 5577 kfree_skb(skb); 5578 goto errout_ifa; 5579 } 5580 err = rtnl_unicast(skb, tgt_net, NETLINK_CB(in_skb).portid); 5581errout_ifa: 5582 in6_ifa_put(ifa); 5583errout: 5584 dev_put(dev); 5585 if (fillargs.netnsid >= 0) 5586 put_net(tgt_net); 5587 5588 return err; 5589} 5590 5591static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa) 5592{ 5593 struct sk_buff *skb; 5594 struct net *net = dev_net(ifa->idev->dev); 5595 struct inet6_fill_args fillargs = { 5596 .portid = 0, 5597 .seq = 0, 5598 .event = event, 5599 .flags = 0, 5600 .netnsid = -1, 5601 }; 5602 int err = -ENOBUFS; 5603 5604 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC); 5605 if (!skb) 5606 goto errout; 5607 5608 err = inet6_fill_ifaddr(skb, ifa, &fillargs); 5609 if (err < 0) { 5610 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 5611 WARN_ON(err == -EMSGSIZE); 5612 kfree_skb(skb); 5613 goto errout; 5614 } 5615 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC); 5616 return; 5617errout: 5618 if (err < 0) 5619 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err); 5620} 5621 5622static void ipv6_store_devconf(const struct ipv6_devconf *cnf, 5623 __s32 *array, int bytes) 5624{ 5625 BUG_ON(bytes < (DEVCONF_MAX * 4)); 5626 5627 memset(array, 0, bytes); 5628 array[DEVCONF_FORWARDING] = READ_ONCE(cnf->forwarding); 5629 array[DEVCONF_HOPLIMIT] = READ_ONCE(cnf->hop_limit); 5630 array[DEVCONF_MTU6] = READ_ONCE(cnf->mtu6); 5631 array[DEVCONF_ACCEPT_RA] = READ_ONCE(cnf->accept_ra); 5632 array[DEVCONF_ACCEPT_REDIRECTS] = READ_ONCE(cnf->accept_redirects); 5633 array[DEVCONF_AUTOCONF] = READ_ONCE(cnf->autoconf); 5634 array[DEVCONF_DAD_TRANSMITS] = READ_ONCE(cnf->dad_transmits); 5635 array[DEVCONF_RTR_SOLICITS] = READ_ONCE(cnf->rtr_solicits); 5636 array[DEVCONF_RTR_SOLICIT_INTERVAL] = 5637 jiffies_to_msecs(READ_ONCE(cnf->rtr_solicit_interval)); 5638 array[DEVCONF_RTR_SOLICIT_MAX_INTERVAL] = 5639 jiffies_to_msecs(READ_ONCE(cnf->rtr_solicit_max_interval)); 5640 array[DEVCONF_RTR_SOLICIT_DELAY] = 5641 jiffies_to_msecs(READ_ONCE(cnf->rtr_solicit_delay)); 5642 array[DEVCONF_FORCE_MLD_VERSION] = READ_ONCE(cnf->force_mld_version); 5643 array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] = 5644 jiffies_to_msecs(READ_ONCE(cnf->mldv1_unsolicited_report_interval)); 5645 array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] = 5646 jiffies_to_msecs(READ_ONCE(cnf->mldv2_unsolicited_report_interval)); 5647 array[DEVCONF_USE_TEMPADDR] = READ_ONCE(cnf->use_tempaddr); 5648 array[DEVCONF_TEMP_VALID_LFT] = READ_ONCE(cnf->temp_valid_lft); 5649 array[DEVCONF_TEMP_PREFERED_LFT] = READ_ONCE(cnf->temp_prefered_lft); 5650 array[DEVCONF_REGEN_MAX_RETRY] = READ_ONCE(cnf->regen_max_retry); 5651 array[DEVCONF_MAX_DESYNC_FACTOR] = READ_ONCE(cnf->max_desync_factor); 5652 array[DEVCONF_MAX_ADDRESSES] = READ_ONCE(cnf->max_addresses); 5653 array[DEVCONF_ACCEPT_RA_DEFRTR] = READ_ONCE(cnf->accept_ra_defrtr); 5654 array[DEVCONF_RA_DEFRTR_METRIC] = READ_ONCE(cnf->ra_defrtr_metric); 5655 array[DEVCONF_ACCEPT_RA_MIN_HOP_LIMIT] = 5656 READ_ONCE(cnf->accept_ra_min_hop_limit); 5657 array[DEVCONF_ACCEPT_RA_PINFO] = READ_ONCE(cnf->accept_ra_pinfo); 5658#ifdef CONFIG_IPV6_ROUTER_PREF 5659 array[DEVCONF_ACCEPT_RA_RTR_PREF] = READ_ONCE(cnf->accept_ra_rtr_pref); 5660 array[DEVCONF_RTR_PROBE_INTERVAL] = 5661 jiffies_to_msecs(READ_ONCE(cnf->rtr_probe_interval)); 5662#ifdef CONFIG_IPV6_ROUTE_INFO 5663 array[DEVCONF_ACCEPT_RA_RT_INFO_MIN_PLEN] = 5664 READ_ONCE(cnf->accept_ra_rt_info_min_plen); 5665 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = 5666 READ_ONCE(cnf->accept_ra_rt_info_max_plen); 5667#endif 5668#endif 5669 array[DEVCONF_PROXY_NDP] = READ_ONCE(cnf->proxy_ndp); 5670 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = 5671 READ_ONCE(cnf->accept_source_route); 5672#ifdef CONFIG_IPV6_OPTIMISTIC_DAD 5673 array[DEVCONF_OPTIMISTIC_DAD] = READ_ONCE(cnf->optimistic_dad); 5674 array[DEVCONF_USE_OPTIMISTIC] = READ_ONCE(cnf->use_optimistic); 5675#endif 5676#ifdef CONFIG_IPV6_MROUTE 5677 array[DEVCONF_MC_FORWARDING] = atomic_read(&cnf->mc_forwarding); 5678#endif 5679 array[DEVCONF_DISABLE_IPV6] = READ_ONCE(cnf->disable_ipv6); 5680 array[DEVCONF_ACCEPT_DAD] = READ_ONCE(cnf->accept_dad); 5681 array[DEVCONF_FORCE_TLLAO] = READ_ONCE(cnf->force_tllao); 5682 array[DEVCONF_NDISC_NOTIFY] = READ_ONCE(cnf->ndisc_notify); 5683 array[DEVCONF_SUPPRESS_FRAG_NDISC] = 5684 READ_ONCE(cnf->suppress_frag_ndisc); 5685 array[DEVCONF_ACCEPT_RA_FROM_LOCAL] = 5686 READ_ONCE(cnf->accept_ra_from_local); 5687 array[DEVCONF_ACCEPT_RA_MTU] = READ_ONCE(cnf->accept_ra_mtu); 5688 array[DEVCONF_IGNORE_ROUTES_WITH_LINKDOWN] = 5689 READ_ONCE(cnf->ignore_routes_with_linkdown); 5690 /* we omit DEVCONF_STABLE_SECRET for now */ 5691 array[DEVCONF_USE_OIF_ADDRS_ONLY] = READ_ONCE(cnf->use_oif_addrs_only); 5692 array[DEVCONF_DROP_UNICAST_IN_L2_MULTICAST] = 5693 READ_ONCE(cnf->drop_unicast_in_l2_multicast); 5694 array[DEVCONF_DROP_UNSOLICITED_NA] = READ_ONCE(cnf->drop_unsolicited_na); 5695 array[DEVCONF_KEEP_ADDR_ON_DOWN] = READ_ONCE(cnf->keep_addr_on_down); 5696 array[DEVCONF_SEG6_ENABLED] = READ_ONCE(cnf->seg6_enabled); 5697#ifdef CONFIG_IPV6_SEG6_HMAC 5698 array[DEVCONF_SEG6_REQUIRE_HMAC] = READ_ONCE(cnf->seg6_require_hmac); 5699#endif 5700 array[DEVCONF_ENHANCED_DAD] = READ_ONCE(cnf->enhanced_dad); 5701 array[DEVCONF_ADDR_GEN_MODE] = READ_ONCE(cnf->addr_gen_mode); 5702 array[DEVCONF_DISABLE_POLICY] = READ_ONCE(cnf->disable_policy); 5703 array[DEVCONF_NDISC_TCLASS] = READ_ONCE(cnf->ndisc_tclass); 5704 array[DEVCONF_RPL_SEG_ENABLED] = READ_ONCE(cnf->rpl_seg_enabled); 5705 array[DEVCONF_IOAM6_ENABLED] = READ_ONCE(cnf->ioam6_enabled); 5706 array[DEVCONF_IOAM6_ID] = READ_ONCE(cnf->ioam6_id); 5707 array[DEVCONF_IOAM6_ID_WIDE] = READ_ONCE(cnf->ioam6_id_wide); 5708 array[DEVCONF_NDISC_EVICT_NOCARRIER] = 5709 READ_ONCE(cnf->ndisc_evict_nocarrier); 5710 array[DEVCONF_ACCEPT_UNTRACKED_NA] = 5711 READ_ONCE(cnf->accept_untracked_na); 5712 array[DEVCONF_ACCEPT_RA_MIN_LFT] = READ_ONCE(cnf->accept_ra_min_lft); 5713} 5714 5715static inline size_t inet6_ifla6_size(void) 5716{ 5717 return nla_total_size(4) /* IFLA_INET6_FLAGS */ 5718 + nla_total_size(sizeof(struct ifla_cacheinfo)) 5719 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */ 5720 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */ 5721 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */ 5722 + nla_total_size(sizeof(struct in6_addr)) /* IFLA_INET6_TOKEN */ 5723 + nla_total_size(1) /* IFLA_INET6_ADDR_GEN_MODE */ 5724 + nla_total_size(4) /* IFLA_INET6_RA_MTU */ 5725 + 0; 5726} 5727 5728static inline size_t inet6_if_nlmsg_size(void) 5729{ 5730 return NLMSG_ALIGN(sizeof(struct ifinfomsg)) 5731 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */ 5732 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */ 5733 + nla_total_size(4) /* IFLA_MTU */ 5734 + nla_total_size(4) /* IFLA_LINK */ 5735 + nla_total_size(1) /* IFLA_OPERSTATE */ 5736 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */ 5737} 5738 5739static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib, 5740 int bytes) 5741{ 5742 int i; 5743 int pad = bytes - sizeof(u64) * ICMP6_MIB_MAX; 5744 BUG_ON(pad < 0); 5745 5746 /* Use put_unaligned() because stats may not be aligned for u64. */ 5747 put_unaligned(ICMP6_MIB_MAX, &stats[0]); 5748 for (i = 1; i < ICMP6_MIB_MAX; i++) 5749 put_unaligned(atomic_long_read(&mib[i]), &stats[i]); 5750 5751 memset(&stats[ICMP6_MIB_MAX], 0, pad); 5752} 5753 5754static inline void __snmp6_fill_stats64(u64 *stats, void __percpu *mib, 5755 int bytes, size_t syncpoff) 5756{ 5757 int i, c; 5758 u64 buff[IPSTATS_MIB_MAX]; 5759 int pad = bytes - sizeof(u64) * IPSTATS_MIB_MAX; 5760 5761 BUG_ON(pad < 0); 5762 5763 memset(buff, 0, sizeof(buff)); 5764 buff[0] = IPSTATS_MIB_MAX; 5765 5766 for_each_possible_cpu(c) { 5767 for (i = 1; i < IPSTATS_MIB_MAX; i++) 5768 buff[i] += snmp_get_cpu_field64(mib, c, i, syncpoff); 5769 } 5770 5771 memcpy(stats, buff, IPSTATS_MIB_MAX * sizeof(u64)); 5772 memset(&stats[IPSTATS_MIB_MAX], 0, pad); 5773} 5774 5775static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype, 5776 int bytes) 5777{ 5778 switch (attrtype) { 5779 case IFLA_INET6_STATS: 5780 __snmp6_fill_stats64(stats, idev->stats.ipv6, bytes, 5781 offsetof(struct ipstats_mib, syncp)); 5782 break; 5783 case IFLA_INET6_ICMP6STATS: 5784 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, bytes); 5785 break; 5786 } 5787} 5788 5789static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev, 5790 u32 ext_filter_mask) 5791{ 5792 struct ifla_cacheinfo ci; 5793 struct nlattr *nla; 5794 u32 ra_mtu; 5795 5796 if (nla_put_u32(skb, IFLA_INET6_FLAGS, READ_ONCE(idev->if_flags))) 5797 goto nla_put_failure; 5798 ci.max_reasm_len = IPV6_MAXPLEN; 5799 ci.tstamp = cstamp_delta(READ_ONCE(idev->tstamp)); 5800 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time); 5801 ci.retrans_time = jiffies_to_msecs(NEIGH_VAR(idev->nd_parms, RETRANS_TIME)); 5802 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci)) 5803 goto nla_put_failure; 5804 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32)); 5805 if (!nla) 5806 goto nla_put_failure; 5807 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla)); 5808 5809 /* XXX - MC not implemented */ 5810 5811 if (ext_filter_mask & RTEXT_FILTER_SKIP_STATS) 5812 return 0; 5813 5814 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64)); 5815 if (!nla) 5816 goto nla_put_failure; 5817 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla)); 5818 5819 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64)); 5820 if (!nla) 5821 goto nla_put_failure; 5822 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla)); 5823 5824 nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr)); 5825 if (!nla) 5826 goto nla_put_failure; 5827 read_lock_bh(&idev->lock); 5828 memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla)); 5829 read_unlock_bh(&idev->lock); 5830 5831 if (nla_put_u8(skb, IFLA_INET6_ADDR_GEN_MODE, 5832 READ_ONCE(idev->cnf.addr_gen_mode))) 5833 goto nla_put_failure; 5834 5835 ra_mtu = READ_ONCE(idev->ra_mtu); 5836 if (ra_mtu && nla_put_u32(skb, IFLA_INET6_RA_MTU, ra_mtu)) 5837 goto nla_put_failure; 5838 5839 return 0; 5840 5841nla_put_failure: 5842 return -EMSGSIZE; 5843} 5844 5845static size_t inet6_get_link_af_size(const struct net_device *dev, 5846 u32 ext_filter_mask) 5847{ 5848 if (!__in6_dev_get(dev)) 5849 return 0; 5850 5851 return inet6_ifla6_size(); 5852} 5853 5854static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev, 5855 u32 ext_filter_mask) 5856{ 5857 struct inet6_dev *idev = __in6_dev_get(dev); 5858 5859 if (!idev) 5860 return -ENODATA; 5861 5862 if (inet6_fill_ifla6_attrs(skb, idev, ext_filter_mask) < 0) 5863 return -EMSGSIZE; 5864 5865 return 0; 5866} 5867 5868static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token, 5869 struct netlink_ext_ack *extack) 5870{ 5871 struct inet6_ifaddr *ifp; 5872 struct net_device *dev = idev->dev; 5873 bool clear_token, update_rs = false; 5874 struct in6_addr ll_addr; 5875 5876 ASSERT_RTNL(); 5877 5878 if (!token) 5879 return -EINVAL; 5880 5881 if (dev->flags & IFF_LOOPBACK) { 5882 NL_SET_ERR_MSG_MOD(extack, "Device is loopback"); 5883 return -EINVAL; 5884 } 5885 5886 if (dev->flags & IFF_NOARP) { 5887 NL_SET_ERR_MSG_MOD(extack, 5888 "Device does not do neighbour discovery"); 5889 return -EINVAL; 5890 } 5891 5892 if (!ipv6_accept_ra(idev)) { 5893 NL_SET_ERR_MSG_MOD(extack, 5894 "Router advertisement is disabled on device"); 5895 return -EINVAL; 5896 } 5897 5898 if (READ_ONCE(idev->cnf.rtr_solicits) == 0) { 5899 NL_SET_ERR_MSG(extack, 5900 "Router solicitation is disabled on device"); 5901 return -EINVAL; 5902 } 5903 5904 write_lock_bh(&idev->lock); 5905 5906 BUILD_BUG_ON(sizeof(token->s6_addr) != 16); 5907 memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8); 5908 5909 write_unlock_bh(&idev->lock); 5910 5911 clear_token = ipv6_addr_any(token); 5912 if (clear_token) 5913 goto update_lft; 5914 5915 if (!idev->dead && (idev->if_flags & IF_READY) && 5916 !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE | 5917 IFA_F_OPTIMISTIC)) { 5918 /* If we're not ready, then normal ifup will take care 5919 * of this. Otherwise, we need to request our rs here. 5920 */ 5921 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters); 5922 update_rs = true; 5923 } 5924 5925update_lft: 5926 write_lock_bh(&idev->lock); 5927 5928 if (update_rs) { 5929 idev->if_flags |= IF_RS_SENT; 5930 idev->rs_interval = rfc3315_s14_backoff_init( 5931 READ_ONCE(idev->cnf.rtr_solicit_interval)); 5932 idev->rs_probes = 1; 5933 addrconf_mod_rs_timer(idev, idev->rs_interval); 5934 } 5935 5936 /* Well, that's kinda nasty ... */ 5937 list_for_each_entry(ifp, &idev->addr_list, if_list) { 5938 spin_lock(&ifp->lock); 5939 if (ifp->tokenized) { 5940 ifp->valid_lft = 0; 5941 ifp->prefered_lft = 0; 5942 } 5943 spin_unlock(&ifp->lock); 5944 } 5945 5946 write_unlock_bh(&idev->lock); 5947 inet6_ifinfo_notify(RTM_NEWLINK, idev); 5948 addrconf_verify_rtnl(dev_net(dev)); 5949 return 0; 5950} 5951 5952static const struct nla_policy inet6_af_policy[IFLA_INET6_MAX + 1] = { 5953 [IFLA_INET6_ADDR_GEN_MODE] = { .type = NLA_U8 }, 5954 [IFLA_INET6_TOKEN] = { .len = sizeof(struct in6_addr) }, 5955 [IFLA_INET6_RA_MTU] = { .type = NLA_REJECT, 5956 .reject_message = 5957 "IFLA_INET6_RA_MTU can not be set" }, 5958}; 5959 5960static int check_addr_gen_mode(int mode) 5961{ 5962 if (mode != IN6_ADDR_GEN_MODE_EUI64 && 5963 mode != IN6_ADDR_GEN_MODE_NONE && 5964 mode != IN6_ADDR_GEN_MODE_STABLE_PRIVACY && 5965 mode != IN6_ADDR_GEN_MODE_RANDOM) 5966 return -EINVAL; 5967 return 1; 5968} 5969 5970static int check_stable_privacy(struct inet6_dev *idev, struct net *net, 5971 int mode) 5972{ 5973 if (mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY && 5974 !idev->cnf.stable_secret.initialized && 5975 !net->ipv6.devconf_dflt->stable_secret.initialized) 5976 return -EINVAL; 5977 return 1; 5978} 5979 5980static int inet6_validate_link_af(const struct net_device *dev, 5981 const struct nlattr *nla, 5982 struct netlink_ext_ack *extack) 5983{ 5984 struct nlattr *tb[IFLA_INET6_MAX + 1]; 5985 struct inet6_dev *idev = NULL; 5986 int err; 5987 5988 if (dev) { 5989 idev = __in6_dev_get(dev); 5990 if (!idev) 5991 return -EAFNOSUPPORT; 5992 } 5993 5994 err = nla_parse_nested_deprecated(tb, IFLA_INET6_MAX, nla, 5995 inet6_af_policy, extack); 5996 if (err) 5997 return err; 5998 5999 if (!tb[IFLA_INET6_TOKEN] && !tb[IFLA_INET6_ADDR_GEN_MODE]) 6000 return -EINVAL; 6001 6002 if (tb[IFLA_INET6_ADDR_GEN_MODE]) { 6003 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]); 6004 6005 if (check_addr_gen_mode(mode) < 0) 6006 return -EINVAL; 6007 if (dev && check_stable_privacy(idev, dev_net(dev), mode) < 0) 6008 return -EINVAL; 6009 } 6010 6011 return 0; 6012} 6013 6014static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla, 6015 struct netlink_ext_ack *extack) 6016{ 6017 struct inet6_dev *idev = __in6_dev_get(dev); 6018 struct nlattr *tb[IFLA_INET6_MAX + 1]; 6019 int err; 6020 6021 if (!idev) 6022 return -EAFNOSUPPORT; 6023 6024 if (nla_parse_nested_deprecated(tb, IFLA_INET6_MAX, nla, NULL, NULL) < 0) 6025 return -EINVAL; 6026 6027 if (tb[IFLA_INET6_TOKEN]) { 6028 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN]), 6029 extack); 6030 if (err) 6031 return err; 6032 } 6033 6034 if (tb[IFLA_INET6_ADDR_GEN_MODE]) { 6035 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]); 6036 6037 WRITE_ONCE(idev->cnf.addr_gen_mode, mode); 6038 } 6039 6040 return 0; 6041} 6042 6043static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev, 6044 u32 portid, u32 seq, int event, unsigned int flags) 6045{ 6046 struct net_device *dev = idev->dev; 6047 struct ifinfomsg *hdr; 6048 struct nlmsghdr *nlh; 6049 int ifindex, iflink; 6050 void *protoinfo; 6051 6052 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags); 6053 if (!nlh) 6054 return -EMSGSIZE; 6055 6056 hdr = nlmsg_data(nlh); 6057 hdr->ifi_family = AF_INET6; 6058 hdr->__ifi_pad = 0; 6059 hdr->ifi_type = dev->type; 6060 ifindex = READ_ONCE(dev->ifindex); 6061 hdr->ifi_index = ifindex; 6062 hdr->ifi_flags = dev_get_flags(dev); 6063 hdr->ifi_change = 0; 6064 6065 iflink = dev_get_iflink(dev); 6066 if (nla_put_string(skb, IFLA_IFNAME, dev->name) || 6067 (dev->addr_len && 6068 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) || 6069 nla_put_u32(skb, IFLA_MTU, READ_ONCE(dev->mtu)) || 6070 (ifindex != iflink && 6071 nla_put_u32(skb, IFLA_LINK, iflink)) || 6072 nla_put_u8(skb, IFLA_OPERSTATE, 6073 netif_running(dev) ? READ_ONCE(dev->operstate) : IF_OPER_DOWN)) 6074 goto nla_put_failure; 6075 protoinfo = nla_nest_start_noflag(skb, IFLA_PROTINFO); 6076 if (!protoinfo) 6077 goto nla_put_failure; 6078 6079 if (inet6_fill_ifla6_attrs(skb, idev, 0) < 0) 6080 goto nla_put_failure; 6081 6082 nla_nest_end(skb, protoinfo); 6083 nlmsg_end(skb, nlh); 6084 return 0; 6085 6086nla_put_failure: 6087 nlmsg_cancel(skb, nlh); 6088 return -EMSGSIZE; 6089} 6090 6091static int inet6_valid_dump_ifinfo(const struct nlmsghdr *nlh, 6092 struct netlink_ext_ack *extack) 6093{ 6094 struct ifinfomsg *ifm; 6095 6096 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) { 6097 NL_SET_ERR_MSG_MOD(extack, "Invalid header for link dump request"); 6098 return -EINVAL; 6099 } 6100 6101 if (nlmsg_attrlen(nlh, sizeof(*ifm))) { 6102 NL_SET_ERR_MSG_MOD(extack, "Invalid data after header"); 6103 return -EINVAL; 6104 } 6105 6106 ifm = nlmsg_data(nlh); 6107 if (ifm->__ifi_pad || ifm->ifi_type || ifm->ifi_flags || 6108 ifm->ifi_change || ifm->ifi_index) { 6109 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for dump request"); 6110 return -EINVAL; 6111 } 6112 6113 return 0; 6114} 6115 6116static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb) 6117{ 6118 struct net *net = sock_net(skb->sk); 6119 struct { 6120 unsigned long ifindex; 6121 } *ctx = (void *)cb->ctx; 6122 struct net_device *dev; 6123 struct inet6_dev *idev; 6124 int err; 6125 6126 /* only requests using strict checking can pass data to 6127 * influence the dump 6128 */ 6129 if (cb->strict_check) { 6130 err = inet6_valid_dump_ifinfo(cb->nlh, cb->extack); 6131 6132 if (err < 0) 6133 return err; 6134 } 6135 6136 err = 0; 6137 rcu_read_lock(); 6138 for_each_netdev_dump(net, dev, ctx->ifindex) { 6139 idev = __in6_dev_get(dev); 6140 if (!idev) 6141 continue; 6142 err = inet6_fill_ifinfo(skb, idev, 6143 NETLINK_CB(cb->skb).portid, 6144 cb->nlh->nlmsg_seq, 6145 RTM_NEWLINK, NLM_F_MULTI); 6146 if (err < 0) 6147 break; 6148 } 6149 rcu_read_unlock(); 6150 6151 return err; 6152} 6153 6154void inet6_ifinfo_notify(int event, struct inet6_dev *idev) 6155{ 6156 struct sk_buff *skb; 6157 struct net *net = dev_net(idev->dev); 6158 int err = -ENOBUFS; 6159 6160 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC); 6161 if (!skb) 6162 goto errout; 6163 6164 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0); 6165 if (err < 0) { 6166 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */ 6167 WARN_ON(err == -EMSGSIZE); 6168 kfree_skb(skb); 6169 goto errout; 6170 } 6171 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC); 6172 return; 6173errout: 6174 if (err < 0) 6175 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err); 6176} 6177 6178static inline size_t inet6_prefix_nlmsg_size(void) 6179{ 6180 return NLMSG_ALIGN(sizeof(struct prefixmsg)) 6181 + nla_total_size(sizeof(struct in6_addr)) 6182 + nla_total_size(sizeof(struct prefix_cacheinfo)); 6183} 6184 6185static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev, 6186 struct prefix_info *pinfo, u32 portid, u32 seq, 6187 int event, unsigned int flags) 6188{ 6189 struct prefixmsg *pmsg; 6190 struct nlmsghdr *nlh; 6191 struct prefix_cacheinfo ci; 6192 6193 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags); 6194 if (!nlh) 6195 return -EMSGSIZE; 6196 6197 pmsg = nlmsg_data(nlh); 6198 pmsg->prefix_family = AF_INET6; 6199 pmsg->prefix_pad1 = 0; 6200 pmsg->prefix_pad2 = 0; 6201 pmsg->prefix_ifindex = idev->dev->ifindex; 6202 pmsg->prefix_len = pinfo->prefix_len; 6203 pmsg->prefix_type = pinfo->type; 6204 pmsg->prefix_pad3 = 0; 6205 pmsg->prefix_flags = pinfo->flags; 6206 6207 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix)) 6208 goto nla_put_failure; 6209 ci.preferred_time = ntohl(pinfo->prefered); 6210 ci.valid_time = ntohl(pinfo->valid); 6211 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci)) 6212 goto nla_put_failure; 6213 nlmsg_end(skb, nlh); 6214 return 0; 6215 6216nla_put_failure: 6217 nlmsg_cancel(skb, nlh); 6218 return -EMSGSIZE; 6219} 6220 6221static void inet6_prefix_notify(int event, struct inet6_dev *idev, 6222 struct prefix_info *pinfo) 6223{ 6224 struct sk_buff *skb; 6225 struct net *net = dev_net(idev->dev); 6226 int err = -ENOBUFS; 6227 6228 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC); 6229 if (!skb) 6230 goto errout; 6231 6232 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0); 6233 if (err < 0) { 6234 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */ 6235 WARN_ON(err == -EMSGSIZE); 6236 kfree_skb(skb); 6237 goto errout; 6238 } 6239 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC); 6240 return; 6241errout: 6242 if (err < 0) 6243 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err); 6244} 6245 6246static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 6247{ 6248 struct net *net = dev_net(ifp->idev->dev); 6249 6250 if (event) 6251 ASSERT_RTNL(); 6252 6253 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp); 6254 6255 switch (event) { 6256 case RTM_NEWADDR: 6257 /* 6258 * If the address was optimistic we inserted the route at the 6259 * start of our DAD process, so we don't need to do it again. 6260 * If the device was taken down in the middle of the DAD 6261 * cycle there is a race where we could get here without a 6262 * host route, so nothing to insert. That will be fixed when 6263 * the device is brought up. 6264 */ 6265 if (ifp->rt && !rcu_access_pointer(ifp->rt->fib6_node)) { 6266 ip6_ins_rt(net, ifp->rt); 6267 } else if (!ifp->rt && (ifp->idev->dev->flags & IFF_UP)) { 6268 pr_warn("BUG: Address %pI6c on device %s is missing its host route.\n", 6269 &ifp->addr, ifp->idev->dev->name); 6270 } 6271 6272 if (ifp->idev->cnf.forwarding) 6273 addrconf_join_anycast(ifp); 6274 if (!ipv6_addr_any(&ifp->peer_addr)) 6275 addrconf_prefix_route(&ifp->peer_addr, 128, 6276 ifp->rt_priority, ifp->idev->dev, 6277 0, 0, GFP_ATOMIC); 6278 break; 6279 case RTM_DELADDR: 6280 if (ifp->idev->cnf.forwarding) 6281 addrconf_leave_anycast(ifp); 6282 addrconf_leave_solict(ifp->idev, &ifp->addr); 6283 if (!ipv6_addr_any(&ifp->peer_addr)) { 6284 struct fib6_info *rt; 6285 6286 rt = addrconf_get_prefix_route(&ifp->peer_addr, 128, 6287 ifp->idev->dev, 0, 0, 6288 false); 6289 if (rt) 6290 ip6_del_rt(net, rt, false); 6291 } 6292 if (ifp->rt) { 6293 ip6_del_rt(net, ifp->rt, false); 6294 ifp->rt = NULL; 6295 } 6296 rt_genid_bump_ipv6(net); 6297 break; 6298 } 6299 atomic_inc(&net->ipv6.dev_addr_genid); 6300} 6301 6302static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 6303{ 6304 if (likely(ifp->idev->dead == 0)) 6305 __ipv6_ifa_notify(event, ifp); 6306} 6307 6308#ifdef CONFIG_SYSCTL 6309 6310static int addrconf_sysctl_forward(struct ctl_table *ctl, int write, 6311 void *buffer, size_t *lenp, loff_t *ppos) 6312{ 6313 int *valp = ctl->data; 6314 int val = *valp; 6315 loff_t pos = *ppos; 6316 struct ctl_table lctl; 6317 int ret; 6318 6319 /* 6320 * ctl->data points to idev->cnf.forwarding, we should 6321 * not modify it until we get the rtnl lock. 6322 */ 6323 lctl = *ctl; 6324 lctl.data = &val; 6325 6326 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 6327 6328 if (write) 6329 ret = addrconf_fixup_forwarding(ctl, valp, val); 6330 if (ret) 6331 *ppos = pos; 6332 return ret; 6333} 6334 6335static int addrconf_sysctl_mtu(struct ctl_table *ctl, int write, 6336 void *buffer, size_t *lenp, loff_t *ppos) 6337{ 6338 struct inet6_dev *idev = ctl->extra1; 6339 int min_mtu = IPV6_MIN_MTU; 6340 struct ctl_table lctl; 6341 6342 lctl = *ctl; 6343 lctl.extra1 = &min_mtu; 6344 lctl.extra2 = idev ? &idev->dev->mtu : NULL; 6345 6346 return proc_dointvec_minmax(&lctl, write, buffer, lenp, ppos); 6347} 6348 6349static void dev_disable_change(struct inet6_dev *idev) 6350{ 6351 struct netdev_notifier_info info; 6352 6353 if (!idev || !idev->dev) 6354 return; 6355 6356 netdev_notifier_info_init(&info, idev->dev); 6357 if (idev->cnf.disable_ipv6) 6358 addrconf_notify(NULL, NETDEV_DOWN, &info); 6359 else 6360 addrconf_notify(NULL, NETDEV_UP, &info); 6361} 6362 6363static void addrconf_disable_change(struct net *net, __s32 newf) 6364{ 6365 struct net_device *dev; 6366 struct inet6_dev *idev; 6367 6368 for_each_netdev(net, dev) { 6369 idev = __in6_dev_get(dev); 6370 if (idev) { 6371 int changed = (!idev->cnf.disable_ipv6) ^ (!newf); 6372 6373 WRITE_ONCE(idev->cnf.disable_ipv6, newf); 6374 if (changed) 6375 dev_disable_change(idev); 6376 } 6377 } 6378} 6379 6380static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf) 6381{ 6382 struct net *net = (struct net *)table->extra2; 6383 int old; 6384 6385 if (p == &net->ipv6.devconf_dflt->disable_ipv6) { 6386 WRITE_ONCE(*p, newf); 6387 return 0; 6388 } 6389 6390 if (!rtnl_trylock()) 6391 return restart_syscall(); 6392 6393 old = *p; 6394 WRITE_ONCE(*p, newf); 6395 6396 if (p == &net->ipv6.devconf_all->disable_ipv6) { 6397 WRITE_ONCE(net->ipv6.devconf_dflt->disable_ipv6, newf); 6398 addrconf_disable_change(net, newf); 6399 } else if ((!newf) ^ (!old)) 6400 dev_disable_change((struct inet6_dev *)table->extra1); 6401 6402 rtnl_unlock(); 6403 return 0; 6404} 6405 6406static int addrconf_sysctl_disable(struct ctl_table *ctl, int write, 6407 void *buffer, size_t *lenp, loff_t *ppos) 6408{ 6409 int *valp = ctl->data; 6410 int val = *valp; 6411 loff_t pos = *ppos; 6412 struct ctl_table lctl; 6413 int ret; 6414 6415 /* 6416 * ctl->data points to idev->cnf.disable_ipv6, we should 6417 * not modify it until we get the rtnl lock. 6418 */ 6419 lctl = *ctl; 6420 lctl.data = &val; 6421 6422 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 6423 6424 if (write) 6425 ret = addrconf_disable_ipv6(ctl, valp, val); 6426 if (ret) 6427 *ppos = pos; 6428 return ret; 6429} 6430 6431static int addrconf_sysctl_proxy_ndp(struct ctl_table *ctl, int write, 6432 void *buffer, size_t *lenp, loff_t *ppos) 6433{ 6434 int *valp = ctl->data; 6435 int ret; 6436 int old, new; 6437 6438 old = *valp; 6439 ret = proc_dointvec(ctl, write, buffer, lenp, ppos); 6440 new = *valp; 6441 6442 if (write && old != new) { 6443 struct net *net = ctl->extra2; 6444 6445 if (!rtnl_trylock()) 6446 return restart_syscall(); 6447 6448 if (valp == &net->ipv6.devconf_dflt->proxy_ndp) 6449 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 6450 NETCONFA_PROXY_NEIGH, 6451 NETCONFA_IFINDEX_DEFAULT, 6452 net->ipv6.devconf_dflt); 6453 else if (valp == &net->ipv6.devconf_all->proxy_ndp) 6454 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 6455 NETCONFA_PROXY_NEIGH, 6456 NETCONFA_IFINDEX_ALL, 6457 net->ipv6.devconf_all); 6458 else { 6459 struct inet6_dev *idev = ctl->extra1; 6460 6461 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 6462 NETCONFA_PROXY_NEIGH, 6463 idev->dev->ifindex, 6464 &idev->cnf); 6465 } 6466 rtnl_unlock(); 6467 } 6468 6469 return ret; 6470} 6471 6472static int addrconf_sysctl_addr_gen_mode(struct ctl_table *ctl, int write, 6473 void *buffer, size_t *lenp, 6474 loff_t *ppos) 6475{ 6476 int ret = 0; 6477 u32 new_val; 6478 struct inet6_dev *idev = (struct inet6_dev *)ctl->extra1; 6479 struct net *net = (struct net *)ctl->extra2; 6480 struct ctl_table tmp = { 6481 .data = &new_val, 6482 .maxlen = sizeof(new_val), 6483 .mode = ctl->mode, 6484 }; 6485 6486 if (!rtnl_trylock()) 6487 return restart_syscall(); 6488 6489 new_val = *((u32 *)ctl->data); 6490 6491 ret = proc_douintvec(&tmp, write, buffer, lenp, ppos); 6492 if (ret != 0) 6493 goto out; 6494 6495 if (write) { 6496 if (check_addr_gen_mode(new_val) < 0) { 6497 ret = -EINVAL; 6498 goto out; 6499 } 6500 6501 if (idev) { 6502 if (check_stable_privacy(idev, net, new_val) < 0) { 6503 ret = -EINVAL; 6504 goto out; 6505 } 6506 6507 if (idev->cnf.addr_gen_mode != new_val) { 6508 WRITE_ONCE(idev->cnf.addr_gen_mode, new_val); 6509 addrconf_init_auto_addrs(idev->dev); 6510 } 6511 } else if (&net->ipv6.devconf_all->addr_gen_mode == ctl->data) { 6512 struct net_device *dev; 6513 6514 WRITE_ONCE(net->ipv6.devconf_dflt->addr_gen_mode, new_val); 6515 for_each_netdev(net, dev) { 6516 idev = __in6_dev_get(dev); 6517 if (idev && 6518 idev->cnf.addr_gen_mode != new_val) { 6519 WRITE_ONCE(idev->cnf.addr_gen_mode, 6520 new_val); 6521 addrconf_init_auto_addrs(idev->dev); 6522 } 6523 } 6524 } 6525 6526 WRITE_ONCE(*((u32 *)ctl->data), new_val); 6527 } 6528 6529out: 6530 rtnl_unlock(); 6531 6532 return ret; 6533} 6534 6535static int addrconf_sysctl_stable_secret(struct ctl_table *ctl, int write, 6536 void *buffer, size_t *lenp, 6537 loff_t *ppos) 6538{ 6539 int err; 6540 struct in6_addr addr; 6541 char str[IPV6_MAX_STRLEN]; 6542 struct ctl_table lctl = *ctl; 6543 struct net *net = ctl->extra2; 6544 struct ipv6_stable_secret *secret = ctl->data; 6545 6546 if (&net->ipv6.devconf_all->stable_secret == ctl->data) 6547 return -EIO; 6548 6549 lctl.maxlen = IPV6_MAX_STRLEN; 6550 lctl.data = str; 6551 6552 if (!rtnl_trylock()) 6553 return restart_syscall(); 6554 6555 if (!write && !secret->initialized) { 6556 err = -EIO; 6557 goto out; 6558 } 6559 6560 err = snprintf(str, sizeof(str), "%pI6", &secret->secret); 6561 if (err >= sizeof(str)) { 6562 err = -EIO; 6563 goto out; 6564 } 6565 6566 err = proc_dostring(&lctl, write, buffer, lenp, ppos); 6567 if (err || !write) 6568 goto out; 6569 6570 if (in6_pton(str, -1, addr.in6_u.u6_addr8, -1, NULL) != 1) { 6571 err = -EIO; 6572 goto out; 6573 } 6574 6575 secret->initialized = true; 6576 secret->secret = addr; 6577 6578 if (&net->ipv6.devconf_dflt->stable_secret == ctl->data) { 6579 struct net_device *dev; 6580 6581 for_each_netdev(net, dev) { 6582 struct inet6_dev *idev = __in6_dev_get(dev); 6583 6584 if (idev) { 6585 WRITE_ONCE(idev->cnf.addr_gen_mode, 6586 IN6_ADDR_GEN_MODE_STABLE_PRIVACY); 6587 } 6588 } 6589 } else { 6590 struct inet6_dev *idev = ctl->extra1; 6591 6592 WRITE_ONCE(idev->cnf.addr_gen_mode, 6593 IN6_ADDR_GEN_MODE_STABLE_PRIVACY); 6594 } 6595 6596out: 6597 rtnl_unlock(); 6598 6599 return err; 6600} 6601 6602static 6603int addrconf_sysctl_ignore_routes_with_linkdown(struct ctl_table *ctl, 6604 int write, void *buffer, 6605 size_t *lenp, 6606 loff_t *ppos) 6607{ 6608 int *valp = ctl->data; 6609 int val = *valp; 6610 loff_t pos = *ppos; 6611 struct ctl_table lctl; 6612 int ret; 6613 6614 /* ctl->data points to idev->cnf.ignore_routes_when_linkdown 6615 * we should not modify it until we get the rtnl lock. 6616 */ 6617 lctl = *ctl; 6618 lctl.data = &val; 6619 6620 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 6621 6622 if (write) 6623 ret = addrconf_fixup_linkdown(ctl, valp, val); 6624 if (ret) 6625 *ppos = pos; 6626 return ret; 6627} 6628 6629static 6630void addrconf_set_nopolicy(struct rt6_info *rt, int action) 6631{ 6632 if (rt) { 6633 if (action) 6634 rt->dst.flags |= DST_NOPOLICY; 6635 else 6636 rt->dst.flags &= ~DST_NOPOLICY; 6637 } 6638} 6639 6640static 6641void addrconf_disable_policy_idev(struct inet6_dev *idev, int val) 6642{ 6643 struct inet6_ifaddr *ifa; 6644 6645 read_lock_bh(&idev->lock); 6646 list_for_each_entry(ifa, &idev->addr_list, if_list) { 6647 spin_lock(&ifa->lock); 6648 if (ifa->rt) { 6649 /* host routes only use builtin fib6_nh */ 6650 struct fib6_nh *nh = ifa->rt->fib6_nh; 6651 int cpu; 6652 6653 rcu_read_lock(); 6654 ifa->rt->dst_nopolicy = val ? true : false; 6655 if (nh->rt6i_pcpu) { 6656 for_each_possible_cpu(cpu) { 6657 struct rt6_info **rtp; 6658 6659 rtp = per_cpu_ptr(nh->rt6i_pcpu, cpu); 6660 addrconf_set_nopolicy(*rtp, val); 6661 } 6662 } 6663 rcu_read_unlock(); 6664 } 6665 spin_unlock(&ifa->lock); 6666 } 6667 read_unlock_bh(&idev->lock); 6668} 6669 6670static 6671int addrconf_disable_policy(struct ctl_table *ctl, int *valp, int val) 6672{ 6673 struct net *net = (struct net *)ctl->extra2; 6674 struct inet6_dev *idev; 6675 6676 if (valp == &net->ipv6.devconf_dflt->disable_policy) { 6677 WRITE_ONCE(*valp, val); 6678 return 0; 6679 } 6680 6681 if (!rtnl_trylock()) 6682 return restart_syscall(); 6683 6684 WRITE_ONCE(*valp, val); 6685 6686 if (valp == &net->ipv6.devconf_all->disable_policy) { 6687 struct net_device *dev; 6688 6689 for_each_netdev(net, dev) { 6690 idev = __in6_dev_get(dev); 6691 if (idev) 6692 addrconf_disable_policy_idev(idev, val); 6693 } 6694 } else { 6695 idev = (struct inet6_dev *)ctl->extra1; 6696 addrconf_disable_policy_idev(idev, val); 6697 } 6698 6699 rtnl_unlock(); 6700 return 0; 6701} 6702 6703static int addrconf_sysctl_disable_policy(struct ctl_table *ctl, int write, 6704 void *buffer, size_t *lenp, loff_t *ppos) 6705{ 6706 int *valp = ctl->data; 6707 int val = *valp; 6708 loff_t pos = *ppos; 6709 struct ctl_table lctl; 6710 int ret; 6711 6712 lctl = *ctl; 6713 lctl.data = &val; 6714 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 6715 6716 if (write && (*valp != val)) 6717 ret = addrconf_disable_policy(ctl, valp, val); 6718 6719 if (ret) 6720 *ppos = pos; 6721 6722 return ret; 6723} 6724 6725static int minus_one = -1; 6726static const int two_five_five = 255; 6727static u32 ioam6_if_id_max = U16_MAX; 6728 6729static const struct ctl_table addrconf_sysctl[] = { 6730 { 6731 .procname = "forwarding", 6732 .data = &ipv6_devconf.forwarding, 6733 .maxlen = sizeof(int), 6734 .mode = 0644, 6735 .proc_handler = addrconf_sysctl_forward, 6736 }, 6737 { 6738 .procname = "hop_limit", 6739 .data = &ipv6_devconf.hop_limit, 6740 .maxlen = sizeof(int), 6741 .mode = 0644, 6742 .proc_handler = proc_dointvec_minmax, 6743 .extra1 = (void *)SYSCTL_ONE, 6744 .extra2 = (void *)&two_five_five, 6745 }, 6746 { 6747 .procname = "mtu", 6748 .data = &ipv6_devconf.mtu6, 6749 .maxlen = sizeof(int), 6750 .mode = 0644, 6751 .proc_handler = addrconf_sysctl_mtu, 6752 }, 6753 { 6754 .procname = "accept_ra", 6755 .data = &ipv6_devconf.accept_ra, 6756 .maxlen = sizeof(int), 6757 .mode = 0644, 6758 .proc_handler = proc_dointvec, 6759 }, 6760 { 6761 .procname = "accept_redirects", 6762 .data = &ipv6_devconf.accept_redirects, 6763 .maxlen = sizeof(int), 6764 .mode = 0644, 6765 .proc_handler = proc_dointvec, 6766 }, 6767 { 6768 .procname = "autoconf", 6769 .data = &ipv6_devconf.autoconf, 6770 .maxlen = sizeof(int), 6771 .mode = 0644, 6772 .proc_handler = proc_dointvec, 6773 }, 6774 { 6775 .procname = "dad_transmits", 6776 .data = &ipv6_devconf.dad_transmits, 6777 .maxlen = sizeof(int), 6778 .mode = 0644, 6779 .proc_handler = proc_dointvec, 6780 }, 6781 { 6782 .procname = "router_solicitations", 6783 .data = &ipv6_devconf.rtr_solicits, 6784 .maxlen = sizeof(int), 6785 .mode = 0644, 6786 .proc_handler = proc_dointvec_minmax, 6787 .extra1 = &minus_one, 6788 }, 6789 { 6790 .procname = "router_solicitation_interval", 6791 .data = &ipv6_devconf.rtr_solicit_interval, 6792 .maxlen = sizeof(int), 6793 .mode = 0644, 6794 .proc_handler = proc_dointvec_jiffies, 6795 }, 6796 { 6797 .procname = "router_solicitation_max_interval", 6798 .data = &ipv6_devconf.rtr_solicit_max_interval, 6799 .maxlen = sizeof(int), 6800 .mode = 0644, 6801 .proc_handler = proc_dointvec_jiffies, 6802 }, 6803 { 6804 .procname = "router_solicitation_delay", 6805 .data = &ipv6_devconf.rtr_solicit_delay, 6806 .maxlen = sizeof(int), 6807 .mode = 0644, 6808 .proc_handler = proc_dointvec_jiffies, 6809 }, 6810 { 6811 .procname = "force_mld_version", 6812 .data = &ipv6_devconf.force_mld_version, 6813 .maxlen = sizeof(int), 6814 .mode = 0644, 6815 .proc_handler = proc_dointvec, 6816 }, 6817 { 6818 .procname = "mldv1_unsolicited_report_interval", 6819 .data = 6820 &ipv6_devconf.mldv1_unsolicited_report_interval, 6821 .maxlen = sizeof(int), 6822 .mode = 0644, 6823 .proc_handler = proc_dointvec_ms_jiffies, 6824 }, 6825 { 6826 .procname = "mldv2_unsolicited_report_interval", 6827 .data = 6828 &ipv6_devconf.mldv2_unsolicited_report_interval, 6829 .maxlen = sizeof(int), 6830 .mode = 0644, 6831 .proc_handler = proc_dointvec_ms_jiffies, 6832 }, 6833 { 6834 .procname = "use_tempaddr", 6835 .data = &ipv6_devconf.use_tempaddr, 6836 .maxlen = sizeof(int), 6837 .mode = 0644, 6838 .proc_handler = proc_dointvec, 6839 }, 6840 { 6841 .procname = "temp_valid_lft", 6842 .data = &ipv6_devconf.temp_valid_lft, 6843 .maxlen = sizeof(int), 6844 .mode = 0644, 6845 .proc_handler = proc_dointvec, 6846 }, 6847 { 6848 .procname = "temp_prefered_lft", 6849 .data = &ipv6_devconf.temp_prefered_lft, 6850 .maxlen = sizeof(int), 6851 .mode = 0644, 6852 .proc_handler = proc_dointvec, 6853 }, 6854 { 6855 .procname = "regen_min_advance", 6856 .data = &ipv6_devconf.regen_min_advance, 6857 .maxlen = sizeof(int), 6858 .mode = 0644, 6859 .proc_handler = proc_dointvec, 6860 }, 6861 { 6862 .procname = "regen_max_retry", 6863 .data = &ipv6_devconf.regen_max_retry, 6864 .maxlen = sizeof(int), 6865 .mode = 0644, 6866 .proc_handler = proc_dointvec, 6867 }, 6868 { 6869 .procname = "max_desync_factor", 6870 .data = &ipv6_devconf.max_desync_factor, 6871 .maxlen = sizeof(int), 6872 .mode = 0644, 6873 .proc_handler = proc_dointvec, 6874 }, 6875 { 6876 .procname = "max_addresses", 6877 .data = &ipv6_devconf.max_addresses, 6878 .maxlen = sizeof(int), 6879 .mode = 0644, 6880 .proc_handler = proc_dointvec, 6881 }, 6882 { 6883 .procname = "accept_ra_defrtr", 6884 .data = &ipv6_devconf.accept_ra_defrtr, 6885 .maxlen = sizeof(int), 6886 .mode = 0644, 6887 .proc_handler = proc_dointvec, 6888 }, 6889 { 6890 .procname = "ra_defrtr_metric", 6891 .data = &ipv6_devconf.ra_defrtr_metric, 6892 .maxlen = sizeof(u32), 6893 .mode = 0644, 6894 .proc_handler = proc_douintvec_minmax, 6895 .extra1 = (void *)SYSCTL_ONE, 6896 }, 6897 { 6898 .procname = "accept_ra_min_hop_limit", 6899 .data = &ipv6_devconf.accept_ra_min_hop_limit, 6900 .maxlen = sizeof(int), 6901 .mode = 0644, 6902 .proc_handler = proc_dointvec, 6903 }, 6904 { 6905 .procname = "accept_ra_min_lft", 6906 .data = &ipv6_devconf.accept_ra_min_lft, 6907 .maxlen = sizeof(int), 6908 .mode = 0644, 6909 .proc_handler = proc_dointvec, 6910 }, 6911 { 6912 .procname = "accept_ra_pinfo", 6913 .data = &ipv6_devconf.accept_ra_pinfo, 6914 .maxlen = sizeof(int), 6915 .mode = 0644, 6916 .proc_handler = proc_dointvec, 6917 }, 6918 { 6919 .procname = "ra_honor_pio_life", 6920 .data = &ipv6_devconf.ra_honor_pio_life, 6921 .maxlen = sizeof(u8), 6922 .mode = 0644, 6923 .proc_handler = proc_dou8vec_minmax, 6924 .extra1 = SYSCTL_ZERO, 6925 .extra2 = SYSCTL_ONE, 6926 }, 6927#ifdef CONFIG_IPV6_ROUTER_PREF 6928 { 6929 .procname = "accept_ra_rtr_pref", 6930 .data = &ipv6_devconf.accept_ra_rtr_pref, 6931 .maxlen = sizeof(int), 6932 .mode = 0644, 6933 .proc_handler = proc_dointvec, 6934 }, 6935 { 6936 .procname = "router_probe_interval", 6937 .data = &ipv6_devconf.rtr_probe_interval, 6938 .maxlen = sizeof(int), 6939 .mode = 0644, 6940 .proc_handler = proc_dointvec_jiffies, 6941 }, 6942#ifdef CONFIG_IPV6_ROUTE_INFO 6943 { 6944 .procname = "accept_ra_rt_info_min_plen", 6945 .data = &ipv6_devconf.accept_ra_rt_info_min_plen, 6946 .maxlen = sizeof(int), 6947 .mode = 0644, 6948 .proc_handler = proc_dointvec, 6949 }, 6950 { 6951 .procname = "accept_ra_rt_info_max_plen", 6952 .data = &ipv6_devconf.accept_ra_rt_info_max_plen, 6953 .maxlen = sizeof(int), 6954 .mode = 0644, 6955 .proc_handler = proc_dointvec, 6956 }, 6957#endif 6958#endif 6959 { 6960 .procname = "proxy_ndp", 6961 .data = &ipv6_devconf.proxy_ndp, 6962 .maxlen = sizeof(int), 6963 .mode = 0644, 6964 .proc_handler = addrconf_sysctl_proxy_ndp, 6965 }, 6966 { 6967 .procname = "accept_source_route", 6968 .data = &ipv6_devconf.accept_source_route, 6969 .maxlen = sizeof(int), 6970 .mode = 0644, 6971 .proc_handler = proc_dointvec, 6972 }, 6973#ifdef CONFIG_IPV6_OPTIMISTIC_DAD 6974 { 6975 .procname = "optimistic_dad", 6976 .data = &ipv6_devconf.optimistic_dad, 6977 .maxlen = sizeof(int), 6978 .mode = 0644, 6979 .proc_handler = proc_dointvec, 6980 }, 6981 { 6982 .procname = "use_optimistic", 6983 .data = &ipv6_devconf.use_optimistic, 6984 .maxlen = sizeof(int), 6985 .mode = 0644, 6986 .proc_handler = proc_dointvec, 6987 }, 6988#endif 6989#ifdef CONFIG_IPV6_MROUTE 6990 { 6991 .procname = "mc_forwarding", 6992 .data = &ipv6_devconf.mc_forwarding, 6993 .maxlen = sizeof(int), 6994 .mode = 0444, 6995 .proc_handler = proc_dointvec, 6996 }, 6997#endif 6998 { 6999 .procname = "disable_ipv6", 7000 .data = &ipv6_devconf.disable_ipv6, 7001 .maxlen = sizeof(int), 7002 .mode = 0644, 7003 .proc_handler = addrconf_sysctl_disable, 7004 }, 7005 { 7006 .procname = "accept_dad", 7007 .data = &ipv6_devconf.accept_dad, 7008 .maxlen = sizeof(int), 7009 .mode = 0644, 7010 .proc_handler = proc_dointvec, 7011 }, 7012 { 7013 .procname = "force_tllao", 7014 .data = &ipv6_devconf.force_tllao, 7015 .maxlen = sizeof(int), 7016 .mode = 0644, 7017 .proc_handler = proc_dointvec 7018 }, 7019 { 7020 .procname = "ndisc_notify", 7021 .data = &ipv6_devconf.ndisc_notify, 7022 .maxlen = sizeof(int), 7023 .mode = 0644, 7024 .proc_handler = proc_dointvec 7025 }, 7026 { 7027 .procname = "suppress_frag_ndisc", 7028 .data = &ipv6_devconf.suppress_frag_ndisc, 7029 .maxlen = sizeof(int), 7030 .mode = 0644, 7031 .proc_handler = proc_dointvec 7032 }, 7033 { 7034 .procname = "accept_ra_from_local", 7035 .data = &ipv6_devconf.accept_ra_from_local, 7036 .maxlen = sizeof(int), 7037 .mode = 0644, 7038 .proc_handler = proc_dointvec, 7039 }, 7040 { 7041 .procname = "accept_ra_mtu", 7042 .data = &ipv6_devconf.accept_ra_mtu, 7043 .maxlen = sizeof(int), 7044 .mode = 0644, 7045 .proc_handler = proc_dointvec, 7046 }, 7047 { 7048 .procname = "stable_secret", 7049 .data = &ipv6_devconf.stable_secret, 7050 .maxlen = IPV6_MAX_STRLEN, 7051 .mode = 0600, 7052 .proc_handler = addrconf_sysctl_stable_secret, 7053 }, 7054 { 7055 .procname = "use_oif_addrs_only", 7056 .data = &ipv6_devconf.use_oif_addrs_only, 7057 .maxlen = sizeof(int), 7058 .mode = 0644, 7059 .proc_handler = proc_dointvec, 7060 }, 7061 { 7062 .procname = "ignore_routes_with_linkdown", 7063 .data = &ipv6_devconf.ignore_routes_with_linkdown, 7064 .maxlen = sizeof(int), 7065 .mode = 0644, 7066 .proc_handler = addrconf_sysctl_ignore_routes_with_linkdown, 7067 }, 7068 { 7069 .procname = "drop_unicast_in_l2_multicast", 7070 .data = &ipv6_devconf.drop_unicast_in_l2_multicast, 7071 .maxlen = sizeof(int), 7072 .mode = 0644, 7073 .proc_handler = proc_dointvec, 7074 }, 7075 { 7076 .procname = "drop_unsolicited_na", 7077 .data = &ipv6_devconf.drop_unsolicited_na, 7078 .maxlen = sizeof(int), 7079 .mode = 0644, 7080 .proc_handler = proc_dointvec, 7081 }, 7082 { 7083 .procname = "keep_addr_on_down", 7084 .data = &ipv6_devconf.keep_addr_on_down, 7085 .maxlen = sizeof(int), 7086 .mode = 0644, 7087 .proc_handler = proc_dointvec, 7088 7089 }, 7090 { 7091 .procname = "seg6_enabled", 7092 .data = &ipv6_devconf.seg6_enabled, 7093 .maxlen = sizeof(int), 7094 .mode = 0644, 7095 .proc_handler = proc_dointvec, 7096 }, 7097#ifdef CONFIG_IPV6_SEG6_HMAC 7098 { 7099 .procname = "seg6_require_hmac", 7100 .data = &ipv6_devconf.seg6_require_hmac, 7101 .maxlen = sizeof(int), 7102 .mode = 0644, 7103 .proc_handler = proc_dointvec, 7104 }, 7105#endif 7106 { 7107 .procname = "enhanced_dad", 7108 .data = &ipv6_devconf.enhanced_dad, 7109 .maxlen = sizeof(int), 7110 .mode = 0644, 7111 .proc_handler = proc_dointvec, 7112 }, 7113 { 7114 .procname = "addr_gen_mode", 7115 .data = &ipv6_devconf.addr_gen_mode, 7116 .maxlen = sizeof(int), 7117 .mode = 0644, 7118 .proc_handler = addrconf_sysctl_addr_gen_mode, 7119 }, 7120 { 7121 .procname = "disable_policy", 7122 .data = &ipv6_devconf.disable_policy, 7123 .maxlen = sizeof(int), 7124 .mode = 0644, 7125 .proc_handler = addrconf_sysctl_disable_policy, 7126 }, 7127 { 7128 .procname = "ndisc_tclass", 7129 .data = &ipv6_devconf.ndisc_tclass, 7130 .maxlen = sizeof(int), 7131 .mode = 0644, 7132 .proc_handler = proc_dointvec_minmax, 7133 .extra1 = (void *)SYSCTL_ZERO, 7134 .extra2 = (void *)&two_five_five, 7135 }, 7136 { 7137 .procname = "rpl_seg_enabled", 7138 .data = &ipv6_devconf.rpl_seg_enabled, 7139 .maxlen = sizeof(int), 7140 .mode = 0644, 7141 .proc_handler = proc_dointvec, 7142 }, 7143 { 7144 .procname = "ioam6_enabled", 7145 .data = &ipv6_devconf.ioam6_enabled, 7146 .maxlen = sizeof(u8), 7147 .mode = 0644, 7148 .proc_handler = proc_dou8vec_minmax, 7149 .extra1 = (void *)SYSCTL_ZERO, 7150 .extra2 = (void *)SYSCTL_ONE, 7151 }, 7152 { 7153 .procname = "ioam6_id", 7154 .data = &ipv6_devconf.ioam6_id, 7155 .maxlen = sizeof(u32), 7156 .mode = 0644, 7157 .proc_handler = proc_douintvec_minmax, 7158 .extra1 = (void *)SYSCTL_ZERO, 7159 .extra2 = (void *)&ioam6_if_id_max, 7160 }, 7161 { 7162 .procname = "ioam6_id_wide", 7163 .data = &ipv6_devconf.ioam6_id_wide, 7164 .maxlen = sizeof(u32), 7165 .mode = 0644, 7166 .proc_handler = proc_douintvec, 7167 }, 7168 { 7169 .procname = "ndisc_evict_nocarrier", 7170 .data = &ipv6_devconf.ndisc_evict_nocarrier, 7171 .maxlen = sizeof(u8), 7172 .mode = 0644, 7173 .proc_handler = proc_dou8vec_minmax, 7174 .extra1 = (void *)SYSCTL_ZERO, 7175 .extra2 = (void *)SYSCTL_ONE, 7176 }, 7177 { 7178 .procname = "accept_untracked_na", 7179 .data = &ipv6_devconf.accept_untracked_na, 7180 .maxlen = sizeof(int), 7181 .mode = 0644, 7182 .proc_handler = proc_dointvec_minmax, 7183 .extra1 = SYSCTL_ZERO, 7184 .extra2 = SYSCTL_TWO, 7185 }, 7186 { 7187 /* sentinel */ 7188 } 7189}; 7190 7191static int __addrconf_sysctl_register(struct net *net, char *dev_name, 7192 struct inet6_dev *idev, struct ipv6_devconf *p) 7193{ 7194 int i, ifindex; 7195 struct ctl_table *table; 7196 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ]; 7197 7198 table = kmemdup(addrconf_sysctl, sizeof(addrconf_sysctl), GFP_KERNEL_ACCOUNT); 7199 if (!table) 7200 goto out; 7201 7202 for (i = 0; table[i].data; i++) { 7203 table[i].data += (char *)p - (char *)&ipv6_devconf; 7204 /* If one of these is already set, then it is not safe to 7205 * overwrite either of them: this makes proc_dointvec_minmax 7206 * usable. 7207 */ 7208 if (!table[i].extra1 && !table[i].extra2) { 7209 table[i].extra1 = idev; /* embedded; no ref */ 7210 table[i].extra2 = net; 7211 } 7212 } 7213 7214 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name); 7215 7216 p->sysctl_header = register_net_sysctl_sz(net, path, table, 7217 ARRAY_SIZE(addrconf_sysctl)); 7218 if (!p->sysctl_header) 7219 goto free; 7220 7221 if (!strcmp(dev_name, "all")) 7222 ifindex = NETCONFA_IFINDEX_ALL; 7223 else if (!strcmp(dev_name, "default")) 7224 ifindex = NETCONFA_IFINDEX_DEFAULT; 7225 else 7226 ifindex = idev->dev->ifindex; 7227 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, NETCONFA_ALL, 7228 ifindex, p); 7229 return 0; 7230 7231free: 7232 kfree(table); 7233out: 7234 return -ENOBUFS; 7235} 7236 7237static void __addrconf_sysctl_unregister(struct net *net, 7238 struct ipv6_devconf *p, int ifindex) 7239{ 7240 struct ctl_table *table; 7241 7242 if (!p->sysctl_header) 7243 return; 7244 7245 table = p->sysctl_header->ctl_table_arg; 7246 unregister_net_sysctl_table(p->sysctl_header); 7247 p->sysctl_header = NULL; 7248 kfree(table); 7249 7250 inet6_netconf_notify_devconf(net, RTM_DELNETCONF, 0, ifindex, NULL); 7251} 7252 7253static int addrconf_sysctl_register(struct inet6_dev *idev) 7254{ 7255 int err; 7256 7257 if (!sysctl_dev_name_is_allowed(idev->dev->name)) 7258 return -EINVAL; 7259 7260 err = neigh_sysctl_register(idev->dev, idev->nd_parms, 7261 &ndisc_ifinfo_sysctl_change); 7262 if (err) 7263 return err; 7264 err = __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name, 7265 idev, &idev->cnf); 7266 if (err) 7267 neigh_sysctl_unregister(idev->nd_parms); 7268 7269 return err; 7270} 7271 7272static void addrconf_sysctl_unregister(struct inet6_dev *idev) 7273{ 7274 __addrconf_sysctl_unregister(dev_net(idev->dev), &idev->cnf, 7275 idev->dev->ifindex); 7276 neigh_sysctl_unregister(idev->nd_parms); 7277} 7278 7279 7280#endif 7281 7282static int __net_init addrconf_init_net(struct net *net) 7283{ 7284 int err = -ENOMEM; 7285 struct ipv6_devconf *all, *dflt; 7286 7287 spin_lock_init(&net->ipv6.addrconf_hash_lock); 7288 INIT_DEFERRABLE_WORK(&net->ipv6.addr_chk_work, addrconf_verify_work); 7289 net->ipv6.inet6_addr_lst = kcalloc(IN6_ADDR_HSIZE, 7290 sizeof(struct hlist_head), 7291 GFP_KERNEL); 7292 if (!net->ipv6.inet6_addr_lst) 7293 goto err_alloc_addr; 7294 7295 all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL); 7296 if (!all) 7297 goto err_alloc_all; 7298 7299 dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL); 7300 if (!dflt) 7301 goto err_alloc_dflt; 7302 7303 if (!net_eq(net, &init_net)) { 7304 switch (net_inherit_devconf()) { 7305 case 1: /* copy from init_net */ 7306 memcpy(all, init_net.ipv6.devconf_all, 7307 sizeof(ipv6_devconf)); 7308 memcpy(dflt, init_net.ipv6.devconf_dflt, 7309 sizeof(ipv6_devconf_dflt)); 7310 break; 7311 case 3: /* copy from the current netns */ 7312 memcpy(all, current->nsproxy->net_ns->ipv6.devconf_all, 7313 sizeof(ipv6_devconf)); 7314 memcpy(dflt, 7315 current->nsproxy->net_ns->ipv6.devconf_dflt, 7316 sizeof(ipv6_devconf_dflt)); 7317 break; 7318 case 0: 7319 case 2: 7320 /* use compiled values */ 7321 break; 7322 } 7323 } 7324 7325 /* these will be inherited by all namespaces */ 7326 dflt->autoconf = ipv6_defaults.autoconf; 7327 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6; 7328 7329 dflt->stable_secret.initialized = false; 7330 all->stable_secret.initialized = false; 7331 7332 net->ipv6.devconf_all = all; 7333 net->ipv6.devconf_dflt = dflt; 7334 7335#ifdef CONFIG_SYSCTL 7336 err = __addrconf_sysctl_register(net, "all", NULL, all); 7337 if (err < 0) 7338 goto err_reg_all; 7339 7340 err = __addrconf_sysctl_register(net, "default", NULL, dflt); 7341 if (err < 0) 7342 goto err_reg_dflt; 7343#endif 7344 return 0; 7345 7346#ifdef CONFIG_SYSCTL 7347err_reg_dflt: 7348 __addrconf_sysctl_unregister(net, all, NETCONFA_IFINDEX_ALL); 7349err_reg_all: 7350 kfree(dflt); 7351 net->ipv6.devconf_dflt = NULL; 7352#endif 7353err_alloc_dflt: 7354 kfree(all); 7355 net->ipv6.devconf_all = NULL; 7356err_alloc_all: 7357 kfree(net->ipv6.inet6_addr_lst); 7358err_alloc_addr: 7359 return err; 7360} 7361 7362static void __net_exit addrconf_exit_net(struct net *net) 7363{ 7364 int i; 7365 7366#ifdef CONFIG_SYSCTL 7367 __addrconf_sysctl_unregister(net, net->ipv6.devconf_dflt, 7368 NETCONFA_IFINDEX_DEFAULT); 7369 __addrconf_sysctl_unregister(net, net->ipv6.devconf_all, 7370 NETCONFA_IFINDEX_ALL); 7371#endif 7372 kfree(net->ipv6.devconf_dflt); 7373 net->ipv6.devconf_dflt = NULL; 7374 kfree(net->ipv6.devconf_all); 7375 net->ipv6.devconf_all = NULL; 7376 7377 cancel_delayed_work_sync(&net->ipv6.addr_chk_work); 7378 /* 7379 * Check hash table, then free it. 7380 */ 7381 for (i = 0; i < IN6_ADDR_HSIZE; i++) 7382 WARN_ON_ONCE(!hlist_empty(&net->ipv6.inet6_addr_lst[i])); 7383 7384 kfree(net->ipv6.inet6_addr_lst); 7385 net->ipv6.inet6_addr_lst = NULL; 7386} 7387 7388static struct pernet_operations addrconf_ops = { 7389 .init = addrconf_init_net, 7390 .exit = addrconf_exit_net, 7391}; 7392 7393static struct rtnl_af_ops inet6_ops __read_mostly = { 7394 .family = AF_INET6, 7395 .fill_link_af = inet6_fill_link_af, 7396 .get_link_af_size = inet6_get_link_af_size, 7397 .validate_link_af = inet6_validate_link_af, 7398 .set_link_af = inet6_set_link_af, 7399}; 7400 7401/* 7402 * Init / cleanup code 7403 */ 7404 7405int __init addrconf_init(void) 7406{ 7407 struct inet6_dev *idev; 7408 int err; 7409 7410 err = ipv6_addr_label_init(); 7411 if (err < 0) { 7412 pr_crit("%s: cannot initialize default policy table: %d\n", 7413 __func__, err); 7414 goto out; 7415 } 7416 7417 err = register_pernet_subsys(&addrconf_ops); 7418 if (err < 0) 7419 goto out_addrlabel; 7420 7421 /* All works using addrconf_wq need to lock rtnl. */ 7422 addrconf_wq = create_singlethread_workqueue("ipv6_addrconf"); 7423 if (!addrconf_wq) { 7424 err = -ENOMEM; 7425 goto out_nowq; 7426 } 7427 7428 rtnl_lock(); 7429 idev = ipv6_add_dev(blackhole_netdev); 7430 rtnl_unlock(); 7431 if (IS_ERR(idev)) { 7432 err = PTR_ERR(idev); 7433 goto errlo; 7434 } 7435 7436 ip6_route_init_special_entries(); 7437 7438 register_netdevice_notifier(&ipv6_dev_notf); 7439 7440 addrconf_verify(&init_net); 7441 7442 rtnl_af_register(&inet6_ops); 7443 7444 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETLINK, 7445 NULL, inet6_dump_ifinfo, RTNL_FLAG_DUMP_UNLOCKED); 7446 if (err < 0) 7447 goto errout; 7448 7449 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_NEWADDR, 7450 inet6_rtm_newaddr, NULL, 0); 7451 if (err < 0) 7452 goto errout; 7453 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_DELADDR, 7454 inet6_rtm_deladdr, NULL, 0); 7455 if (err < 0) 7456 goto errout; 7457 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETADDR, 7458 inet6_rtm_getaddr, inet6_dump_ifaddr, 7459 RTNL_FLAG_DOIT_UNLOCKED | 7460 RTNL_FLAG_DUMP_UNLOCKED); 7461 if (err < 0) 7462 goto errout; 7463 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETMULTICAST, 7464 NULL, inet6_dump_ifmcaddr, 7465 RTNL_FLAG_DUMP_UNLOCKED); 7466 if (err < 0) 7467 goto errout; 7468 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETANYCAST, 7469 NULL, inet6_dump_ifacaddr, 7470 RTNL_FLAG_DUMP_UNLOCKED); 7471 if (err < 0) 7472 goto errout; 7473 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETNETCONF, 7474 inet6_netconf_get_devconf, 7475 inet6_netconf_dump_devconf, 7476 RTNL_FLAG_DOIT_UNLOCKED | 7477 RTNL_FLAG_DUMP_UNLOCKED); 7478 if (err < 0) 7479 goto errout; 7480 err = ipv6_addr_label_rtnl_register(); 7481 if (err < 0) 7482 goto errout; 7483 7484 return 0; 7485errout: 7486 rtnl_unregister_all(PF_INET6); 7487 rtnl_af_unregister(&inet6_ops); 7488 unregister_netdevice_notifier(&ipv6_dev_notf); 7489errlo: 7490 destroy_workqueue(addrconf_wq); 7491out_nowq: 7492 unregister_pernet_subsys(&addrconf_ops); 7493out_addrlabel: 7494 ipv6_addr_label_cleanup(); 7495out: 7496 return err; 7497} 7498 7499void addrconf_cleanup(void) 7500{ 7501 struct net_device *dev; 7502 7503 unregister_netdevice_notifier(&ipv6_dev_notf); 7504 unregister_pernet_subsys(&addrconf_ops); 7505 ipv6_addr_label_cleanup(); 7506 7507 rtnl_af_unregister(&inet6_ops); 7508 7509 rtnl_lock(); 7510 7511 /* clean dev list */ 7512 for_each_netdev(&init_net, dev) { 7513 if (__in6_dev_get(dev) == NULL) 7514 continue; 7515 addrconf_ifdown(dev, true); 7516 } 7517 addrconf_ifdown(init_net.loopback_dev, true); 7518 7519 rtnl_unlock(); 7520 7521 destroy_workqueue(addrconf_wq); 7522} 7523